Because this summary is often behind schedule updates to the current date are being added here to make it more relEvAnt to current conditions
August 11, 2026
Notable earthquakes and events:
The new moon and solar eclipse will arrive on August 12, 2026 at 17:37 UT. This will include a total eclipse of the sun. This eclipse will be total near Iceland and Greenland at its peak with the greatest eclipse at 65N 25W over Iceland and will also be total in the area of Spain, Portugal, Southern France and northern Italy. These areas could see significantly enhanced seismicity beginning in several days. This eclipse will be partial in the northeastern U.S. and throughout Canada. Longitudes which are sub-solar (local solar noon) are near 85 West longitude while those at local solar midnight are centered near 95 East longitude. In the west these include area of Central and northwestern South America and eastern U.S. and in the east areas of western Indonesia, Myanmar, and eastern China. These areas are likely to see tidal triggering with this new moon. A moderately large to large tidally triggered earthquake is considered moderately likely with this new moon." (March 17-21, 2023)
A major earthquake of M 7.4 occurred today in the area of Colombia. This
epicenter will be nearly sub-solar when the eclipse arrives on August 12, 2026.
This event occurred at an intermediate depth (110 km) and was widely felt with damage throughout Colombia and as far as
Mexico and Venezuela. Some damage was reported in Colombia with intensity VIII
in Montenegro, Quindio and VII in Manizales, Caldas, Jamundi, Villamaria, Armenia, Jardin, Pocri, and in Hopelchen, Mexico with VI shaking inSan Jose, Bello, Salento, Cali, Ulloa, La Estrella among others. It was felt with moderate intensity as far as Puerto Rico, Mexico, Panama, Venezuela, Brazil, Ecuador, Jamaica.
Current reports indicated several hundred people were killed in the earthquake,
mostly by falling debris or collapsing structures. This event is consistent with triggering from Typhoon Dolphin
landfall at 144 degrees from this epicenter as well as with tidal stress
triggering associated with the upcoming solar eclipse of August 12, 2026 (see
previous summary for case studies of some major South American eclipse-earthquake
occurrences). Other seismic active areas at 144 degrees from Typhoon Dolphin
landfall include the South Sandwich Islands where a strong earthquake could
occur with the solar eclipse of August 12, 2026.
This is the strongest earthquake in Colombia in at least 35 years. The last earthquake in Colombia with M>=7.0 occurred as an M 7.2 on November 15, 2004
and before that on November 19, 1991. This summary described the earthquake
of November, 2004 at the time as:
"... an earthquake of M 7.2-7.3 hit off the coast of western Colombia. The online source "The Age" indicates
that this event which occurred early in the Colombian morning injured at least 30
while destroying more than 500 homes and damaging many other buildings.
More damage is expected to be reported at a later time as the area is remote
and rescue teams have not yet reached the most damaged regions. The earthquake
occurred in Choco Province one of Colombia's poorest areas. Clinics and buildings
in Cali were damaged. Damage also occurred in Jamunda and Buenventura.
In Bogota eletrical service was interrupted. The most damaging and deadly
earthquake in Colombia in recent years was an M 6.2 on Jan. 25, 1999 in the
area of Armenia, Colombia which killed more than 100 and left about 250,000 homeless.
Today's earthquake is the strongest ever recorded by the Preliminary
Determination of Epicenters (PDE) catalog in the area (2-6N 70-80W) of
western and central Colombia (in the past 50 years). The strongest previously
recorded event in this area was an M 7.0 on Nov. 19, 1991 about 100 km
east of today's epicenter. That earthquake had effects quite similar to
those published for today's event with two killed and 28 houses damaged in
Choco Department and minor damage in Cali and Buenaventura. It was also felt
at Quito and Guayaquil, Ecuador.
...
An earthquake of M 4.8 was located in southern
Sumatra about three hours after the Colombia mainshock within 100 km of the
exact antipode of the Colombia event. Events are antipodal if their longitudes
add to 180 degrees (in this case the longitude of Colombia is given as 77.6W
and that of Sumatra quake as 102.4E - a sum of exactly 180) and their signed
latitudes sum to zero (in this case the longitude of the Colombia event is 4.6N
and of the Sumatra event 5.5S - a difference of 0.9 degrees about 100 km
off of exact antipodal events). Geometric focusing at the antipode of a
major quake can produce seismic wave amplitudes which may be strong enough
to trigger antipodal activity as it appears to have done in this case." (November 15, 2004)
The last earthquake in Colombia of M>6.5 occurred 13 years ago on August 13, 2013.
At the time the relation to Sumatra was discussed as:
"This epicenter (in Colombia) is at the exact antipode of an M 5.3 which hit south of Sumatra two days ago and may
have been promoted or triggered by that event. Frequent readers of this
summary know that two epicenters are antipodal if their latitudes are
the same and in opposite hemispheres (6N and 6S in the current pair)
and their longitudes add to 180 and are in opposite hemispheres (78W and
102E in the current pair). Further activity in Sumatra near this epicenter
is likely in the next several days. After this was written an M 4.6 did
occur in this region of Sumatra. The earthquake off Panama is the
strongest to occur in the world since an M 7.2 in the South Sandwich Islands
of July 15, 2013, a month ago. It is also the largset within 200 km of this
epicenter to occur since events of M 7.2 on November 15, 2004; October 18, 1992 and November 19, 1991.
The 10- to 11-year cycle here is probably not coincidental but is forced
by solar activity also on an 11-year cycle." (August 13, 2013)
After a moderate earthquake in Sumatra occurred yesterday this summary discussed
the relation between Sumatra and Colombia earthquakes (see this issue below).
In particular it is worthwhile to note the antipodal relation of today's
event in Colombia with the earlier M 5.3 in Sumatra. Within error limits
imposed by depth and size of the rupture zone, these two are very nearly
exactly antipodal (compare 5S and 5N and 103E and 76W for antipodality).
O: 09AUG2026 15:15:04 5.8S 102.9E MW=5.3 EMSC SOUTHERN SUMATRA, INDONESIA
O: 10AUG2026 12:34:28 4.9N 76.2W ML=7.4 NEIC COLOMBIA
Statistical evidence indicates that some triggering or promotion forward in time can occur in regions which are under high stress due to additional stress events of small size. Among these are surface and body waves passing through a region. Triggering may be dynamic with the promoted earthquake occurring at the same time as the stress event or delayed with an earthquake occurring later in time but still related to the stress event through water lubrication or other various geophysical effects on the faults. We have argued in this report for the past 35 years that this effect is most observable where the seismic waves are largest. In general this occurs at distances from the rupture ends of the earthquake producing those waves (mainshock) which we have termed nodal distances. These are defined by the formula D=360*m/n where D is the distance in degrees and m<=m where n an m are small integers. These are also the locations of the maximum corrections to magnitude in the standard Jeffreys-Bullen tables. In addition there is focusing of seismic energy from reflections and refractions of f the core-mantle and the inner-outer core boundary of the earth. This focuses energy at the surface in the distance between 101 and 108 degrees (core-mantle) and 141-148 degrees (inner-outer core boundary). In this report we monitor seismicity at these distances following major earthquakes as experience has shown that strong and/or unusual earthquake are much more likely to occur at these distance from the mainshock.
Some of these were noted after the Colombian event in August, 2013 as:
Antipodal (~180 degrees)
Colombia to Sumatra
Outer shadow zone edge (141-148 degrees)
Colombia to South Indian Ocean, Myanmar, Taiwan, New Guinea, China, central Asia, Sichuan,
Node 3 (120 degrees)
Colombia to Hokkaido, Santa Cruz, Honshu,
Inner shadow zone edge (101-110 degrees)
Colombia to Kermadec Is, Caucasus, New Zealand, Tonga/Fiji,
Node 4 (90 degrees)
Colombia to Andreanof Islands,
Node 5 (72 degrees)
Colombia to Spain, Yukon, South Atlantic,
Node 6 (60 degrees)
Colombia to Vancouver Island, BC
Node 7 (52 degrees)
Colombia to Quebec, Idaho, San Francisco, northern California,
Node 8 (45 degrees)
Colombia to San Diego, Central California, Utah, Baja California,
Today's earthquake in Colombia is also consistent with SFE triggering
from a solar flare. This flare of C2.4 class began at the same
time as the earthquake in Colombia occurred (12:34 UT) according to
data from SWPC (see below). This is the strongest C-class solar flare
since a C6.3 (#1020) on August 2, 2026.
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
1700 1234 1316 1400 C2.4 (August 10, 2026) 7.1E-03 *
Sumatra M 7.5 12:34 UT
O: 10AUG2026 12:34:28 4.9N 76.2W ML=7.4 NEIC COLOMBIA
O: 10AUG2026 12:34:28 4.9N 76.2W MW=7.4 EMSC COLOMBIA
O: 10AUG2026 13:18:10 4.9N 76.3W mb=5.0 EMSC COLOMBIA
As expected the antipode of the event in Colombia saw enhanced seismicity
later in the day. The only earthquake in the world of M>5 (other than the
M 7.4 in Colombia) occurred in Southern Sumatra with M 5.1. It was not
reported felt in that area of the Sunda Strait.
O: 11AUG2026 01:12:45 4.5S 102.5E MB=4.7 EMSC SOUTHERN SUMATRA, INDONESIA
O: 10AUG2026 17:08:08 5.9S 102.4E MB=5.1 EMSC SOUTHERN SUMATRA, INDONESIA
In previous summaries this summary provided some historical insight
into the relation between total solar eclipses in the vicinity of of Europe
and accompanying major earthquakes in that region. Tidal stresses are
maximized at antipodal locations as well so today this summary will examine
some notable earthquakes antipodal to total solar eclipses. In the current
case the antipode of Iceland to Europe is in the vicinity of the Balleny
Islands north to New Zealand and the Kermadec Islands and in the Tonga/Fiji subduction zone, an active seismic
region where a strong earthquake may be expected with the eclipse of
August 12, 2026. Moderately enhanced seismicity is also expected at this
time in areas of the North Atlantic including Iceland and the Azores and in
the region of Southern Europe including Italy, Greece, Span and possibly
as far as Turkey. Other enhanced seismicity may occur in volcanic regions such as Hawaii
which are especially vulnearable to tidal stresses with an eclipse.
Major solar eclipses of 1868 (see previous issue fo details) were closely
associated with major earthquakes. The eclipse of August 18, 1868 was discussed
in relation to great earthquakes in South America in the previous issue
of this summary, but a second annular eclipse of the sun occurred on February 23, 1868.
This eclipse was followed at the next new moon by the strongest earthquake
ever recorded in Hawaii - an M 7.0 on March 28, 1868.
The strongest earthquake felt in the world today was an M 5.3 south of Sumatra,
Indonesia. It was likely felt in the epicentral area with moderate intensity.
Earthquakes in this area of Sumatra are often coupled with antipodal
earthquakes in the region of Colombia - in this cast at 5N 77W and
a moderate to strong earthquake is likely in that area at this time. This
may be emphasized with the coming total solar eclipse.
This summary has emphasized this antipodal relation between earthquakes in
Sumatra and Colombia in previous issues. For example when an M 6.6 in Sumatra occurred
on January 14, 2022 was followed by an M 5.5 at the antipode on February 23, 2022
this summary noted:
"A moderate earthquake occurred in northern Colombia today with M 5.5.
Moderately large earthquakes in Colombia are often associated with enhanced
seismicity near the antipode in the region of Sumatra, Indonesia. A moderately
large to large earthquake is likely in the next several days in that region
due to antipodal triggering." (February 23, 2022)
and when an M 7.2 hit Colombia on November 15, 2004 this summary also related
the possibility of antipodal triggering as:
"The most damaging and deadly
earthquake in Colombia in recent years was an M 6.2 on Jan. 25, 1999 in the
area of Armenia, Colombia which killed more than 100 and left about 250,000 homeless.
Today's earthquake is the strongest ever recorded by the Preliminary
Determination of Epicenters (PDE) catalog in the area (2-6N 70-80W) of
western and central Colombia (in the past 50 years). The strongest previously
recorded event in this area was an M 7.0 on Nov. 19, 1991 about 100 km
east of today's epicenter. That earthquake had effects quite similar to
those published for today's event with two killed and 28 houses damaged in
Choco Department and minor damage in Cali and Buenaventura. It was also felt
at Quito and Guayaquil, Ecuador. Today's felt area is likely to extend to
northern Peru. ...
An earthquake of M 4.8 was located in southern Sumatra about three hours after the Colombia mainshock within 100 km of the
exact antipode of the Colombia event. Events are antipodal if their longitudes
add to 180 degrees (in this case the longitude of Colombia is given as 77.6W
and that of Sumatra quake as 102.4E - a sum of exactly 180) and their signed
latitudes sum to zero (in this case the longitude of the Colombia event is 4.6N
and of the Sumatra event 5.5S - a difference of 0.9 degrees about 100 km
off of exact antipodal events). Geometric focussing at the antipode of a
major quake can produce seismic wave amplitudes which may be strong enough
to trigger antipodal activity as it appears to have done in this case." (November 15, 2004)
Today's epicenter in Sumatra is at the 10th node from Typhoon Dolphin (36 degrees)
and near the antipode of earthquakes in Venezuela and may have been promoted
by energy from those sources.
O: 09AUG2026 15:35:19 5.8S 102.7E ML=4.0 EMSC SOUTHERN SUMATRA, INDONESIA
O: 09AUG2026 15:15:04 5.8S 102.9E MW=5.3 EMSC SOUTHERN SUMATRA, INDONESIA
NEIC reported an earthquake of M 4.7 in Iran was felt with intensity up to II-III in the area(s) of Iran in Shush and in Kuwait.
O: 10AUG2026 15:01:10 32.7N 48.0E MB=4.7 EMSC WESTERN IRAN
EMSC reported an earthquake of M 5.0 in Costa Rica was felt with intensity up to II-III in the area(s) of Costa Rica in Nicoya, Santo Domingo andin La Chorera, Panama.
O: 10AUG2026 20:54:59 8.4N 85.6W MB=5.0 EMSC OFF COAST OF COSTA RICA
EMSC reported an earthquake of M 4.2 in Panama was felt with intensity up to II-III in the area(s) of Panama in Panama City.
O: 10AUG2026 12:12:32 7.4N 80.4W ML=4.2 EMSC PANAMA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM PEILOU (DEPRESSION 13W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS PEILOU 2026-08-11 00:00 UT 25.1N 155.0E 40 kts North Pacific
TS Peilou (TD 13W) continued today in the Northern Pacific with winds up to 40 kts. It will track to the northeast and not encounter seismic areas in the next several days. No seismicity is expected to be enhanced near this storm at this time. The antipode at 21S 30W is not an active seismic area.
TROPICAL STORM CHAN-HOM DEPRESSION 14W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS CHAN-HOM 2026-08-11 00:00 UT 35.8N 140.7E 45 kts HONSHU, JAPAN
TS Chan-Hom (TD 14W) continued today and made landfall on the east coast of Honshu, Japan with winds up to 45 kts. It may help trigger a moderate earthquake near its time of landfall in Honshu, Japan. The antipode is at 35S 43W in the South Atlantic - not a seismic area.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of August 10, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
1660 1141 1150 1154 B6.9 (August 10, 2026) 6.1E-04
1690 1154 1159 1205 B7.2 (August 10, 2026) 5.5E-04
1670 1212 1229 1234 C1.0 (August 10, 2026) 1.5E-03
Northern Mid-Atlantic M 5.0 12:12 UT
Panama M 4.2 12:12 UT
Santa Cruz M 4.7 11:50 UT
Argentina M 4.2 12:03 UT
1700 1234 1316 1400 C2.4 (August 10, 2026) 7.1E-03
Colombia 12:34 UT M 7.4
* Indicates variation in parameters from SWPC list
GEOMAGNETIC FIELD: active August 11 quiet August 12-13. Solar M-flare chance: 5% X-class: 1% proton storm: 1%
AP Indicies: global: 5, high: 5, mid-latitude: 5, time of max k: 09:00-12:00 UT; Max k: 4 Global Kp 1.67 0000-0300, August 10; Sunspot Number: 55; Radio Flux: 95
The Hp30 index (GFZ) did not exceed 2 today. No geomagnetic storms were observed.
August 10, 2026
Notable earthquakes and events:
UPDATE:
A major earthquake of M 7.4 has just occurred in the area of Colombia. This event occurred
at an intermediate depth and was widely felt throughout Colombia and as far as
Mexico and Venezuela. Some damage was reported in Colombia with intensity VIII
in Montenegro, Quindio and VII in Manizales, Caldas, Jamundi, Villamaria, Armenia, Jardin, Pocri, and in Hopelchen, Mexico with VI shaking inSan Jose, Bello, Salento, Cali, Ulloa, La Estrella among others. It was felt with moderate intensity as far as Puerto Rico, Mexico, Panama, Venezuela, Brazil, Ecuador, Jamaica.
Moderate damage is likely due to the intermediate depth of this earthquake.
A tsunami is unlikely. This is consistent with triggering from Typhoon Dolphin
landfall at 144 degrees from this epicenter as well as with tidal stress
triggering associated with the upcoming solar eclipse of August 12, 2026 (see
previous summary for case studies of some major South American eclipse-earthquake
occurrences).
This is the strongest earthquake in Colombia in at least 35 years. The last earthquake in Colombia with M>=7.0 occurred as an M 7.2 on November 15, 2004
and before that on November 19, 1991. This summary described the earthquake
of November, 2004 at the time as:
"... an earthquake of M 7.2-7.3 hit off the coast of western Colombia. The online source "The Age" indicates
that this event which occurred early in the Colombian morning injured at least 30
while destroying more than 500 homes and damaging many other buildings.
More damage is expected to be reported at a later time as the area is remote
and rescue teams have not yet reached the most damaged regions. The earthquake
occurred in Choco Province one of Colombia's poorest areas. Clinics and buildings
in Cali were damaged. Damage also occurred in Jamunda and Buenventura.
In Bogota eletrical service was interrupted. The most damaging and deadly
earthquake in Colombia in recent years was an M 6.2 on Jan. 25, 1999 in the
area of Armenia, Colombia which killed more than 100 and left about 250,000 homeless.
Today's earthquake is the strongest ever recorded by the Preliminary
Determination of Epicenters (PDE) catalog in the area (2-6N 70-80W) of
western and central Colombia (in the past 50 years). The strongest previously
recorded event in this area was an M 7.0 on Nov. 19, 1991 about 100 km
east of today's epicenter. That earthquake had effects quite similar to
those published for today's event with two killed and 28 houses damaged in
Choco Department and minor damage in Cali and Buenaventura. It was also felt
at Quito and Guayaquil, Ecuador.
...
An earthquake of M 4.8 was located in southern
Sumatra aboutthree hours after the Colombia mainshock within 100 km of the
exact antipode of the Colombia event. Events are antipodal if their longitudes
add to 180 degrees (in this case the longitude of Colombia is given as 77.6W
and that of Sumatra quake as 102.4E - a sum of exactly 180) and their signed
latitudes sum to zero (in this case the longitude of the Colombia event is 4.6N
and of the Sumatra event 5.5S - a difference of 0.9 degrees about 100 km
off of exact antipodal events). Geometric focusing at the antipode of a
major quake can produce seismic wave amplitudes which may be strong enough
to trigger antipodal activity as it appears to have done in this case." (November 15, 2004)
The last earthquake in Colombia of M>6.5 occurred 13 years ago on August 13, 2013.
At the time the relation to Sumatra was discussed as:
"This epicenter (in Colombia) is at the exact antipode of an M 5.3 which hit south of Sumatra two days ago and may
have been promoted or triggered by that event. Frequent readers of this
summary know that two epicenters are antipodal if their latitudes are
the same and in opposite hemispheres (6N and 6S in the current pair)
and their longitudes add to 180 and are in opposite hemispheres (78W and
102E in the current pair). Further activity in Sumatra near this epicenter
is likely in the next several days. After this was written an M 4.6 did
occur in this region of Sumatra. The earthquake off Panama is the
strongest to occur in the world since an M 7.2 in the South Sandwich Islands
of July 15, 2013, a month ago. It is also the largset within 200 km of this
epicenter to occur since events of M 7.2 on November 15, 2004; October 18, 1992 and November 19, 1991.
The 10- to 11-year cycle here is probably not coincidental but is forced
by solar activity also on an 11-year cycle." (August 13, 2013)
After a moderate earthquake in Sumatra occurred yesterday this summary discussed
the relation between Sumatra and Colombia earthquakes (see this issue below).
In particular it is worthwhile to note the antipodal relation of today's
event in Colombia with the earlier M 5.3 in Sumatra. Within error limits
imposed by depth and size of the rupture zone, these two are very nearly
exactly antipodal (compare 5S and 5N and 103E and 76W for antipodality.
O: 09AUG2026 15:15:04 5.8S 102.9E MW=5.3 EMSC SOUTHERN SUMATRA, INDONESIA
O: 10AUG2026 12:34:28 4.9N 76.2W ML=7.4 NEIC COLOMBIA
Statistical evidence indicates that some triggering or promotion forward in time can occur in regions which are under high stress due to additional stress events of small size. Among these are surface and body waves passing through a region. Triggering may be dynamic with the promoted earthquake occurring at the same time as the stress event or delayed with an earthquake occurring later in time but still related to the stress event through water lubrication or other various geophysical effects on the faults. We have argued in this report for the past 35 years that this effect is most observable where the seismic waves are largest. In general this occurs at distances from the rupture ends of the earthquake producing those waves (mainshock) which we have termed nodal distances. These are defined by the formula D=360*m/n where D is the distance in degrees and m<=m where n an m are small integers. These are also the locations of the maximum corrections to magnitude in the standard Jeffreys-Bullen tables. In addition there is focusing of seismic energy from reflections and refractions of f the core-mantle and the inner-outer core boundary of the earth. This focuses energy at the surface in the distance between 101 and 108 degrees (core-mantle) and 141-148 degrees (inner-outer core boundary). In this report we monitor seismicity at these distances following major earthquakes as experience has shown that strong and/or unusual earthquake are much more likely to occur at these distance from the mainshock.
Some of these were noted after the Coloombian event in August, 2013 as:
Antipodal (~180 degrees)
Colombia to Sumatra
Outer shadow zone edge (141-148 degrees)
Colombia to South Indian Ocean, Myanmar, Taiwan, New Guinea, China, central Asia, Sichuan,
Node 3 (120 degrees)
Colombia to Hokkaido, Santa Cruz, Honshu,
Inner shadow zone edge (101-110 degrees)
Colombia to Kermadec Is, Caucasus, New Zealand, Tonga/Fiji,
Node 4 (90 degrees)
Colombia to Andreanof Islands,
Node 5 (72 degrees)
Colombia to Spain, Yukon, South Atlantic,
Node 6 (60 degrees)
Colombia to Vancouver Island, BC
Node 7 (52 degrees)
Colombia to Quebec, Idaho, San Francisco, northern California,
Node 8 (45 degrees)
Colombia to San Diego, Central California, Utah, Baja California,
O: 10AUG2026 12:34:28 4.9N 76.2W ML=7.4 NEIC COLOMBIA
ORIGINAL SUMMARY FOR AUGUST 10, 2026
The new moon will arrive on August 12, 2026 at 17:37 UT. This will include a total eclipse of the sun. This eclipse will be total near Iceland and Greenland at its peak with the greatest eclipse at 65N 25W over Iceland and will also be total in the area of Spain, Portugal, Southern France and northern Italy. These areas could see significantly enhanced seismicity beginning in several days. This eclipse will be partial in the northeastern U.S. and throughout Canada. Longitudes which are sub-solar (local solar noon) are near 85 West longitude while those at local solar midnight are centered near 95 East longitude. In the west these include area of Central and northwestern South America and eastern U.S. and in the east areas of western Indonesia, Myanmar, and eastern China. These areas are likely to see tidal triggering with this new moon. A moderately large to large tidally triggered earthquake is considered moderately likely with this new moon." (March 17-21, 2023)
In the previous summary this summary provided some historical insight
into the relation between total solar eclipses in the vicinity of of Europe
and accompanying major earthquakes in that region. Tidal stresses are
maximized at antipodal locations as well so today this summary will examine
some notable earthquakes antipodal to total solar eclipses. In the current
case the antipode of Iceland to Europe is in the vicinity of the Balleny
Islands north to New Zealand and the Kermadec Islands, an active seismic
region where a strong earthquake may be expected with the eclipse of
August 12, 2026.
Probably the most notable instance of antipodal relations between total
solar eclipses and great earthquakes occurred in mid-August, 1868. This
began with an M 8.5 in southern Peru on August 13, 1868 and continued
with an M 7.7 in Ecuador on August 16, 1868. The total solar eclipse
occurred on August 18, 1868 and lasted for a long 6 minutes maximum.
The earthquake was described in this summary as:
"This was one of the most widely investigated earthquakes in South America. Damage occurred throughout southern Peru and northern Chile from Guayaquil on the north to Valparaiso on the south. About 150 were killed in Moquequa alone and 3000 in the region of Arequipa but the total number of deaths ranged from several hundred to an estimated 40,000. Many of the dead were killed by the tsunami while seeking protection from the earthquake at sea walls. Arequipa, Moquegua, Mollendo, Ilo and Arica and other villages and towns in the area were largely destroyed. A tsunami was generated which was observed throughout the Pacific Ocean and did damage in New Zealand, Australia, Samoa, Hawaii, California and Japan. At Isla, Peru the sea withdrew suddenly and after a delay of 20 minutes in Arica the first wave reach with maximum height up to 17 meters. This tsunami destroyed what was left of Arica. The third or fourth wave was the highest and was described as a wall of water up to 45 feet high. This wave carried several ships as much as three miles inland where they lay for more than 50 years afterwards. A series of foreshocks preceded the earthquake. Cracks formed near Arica which were 5-8 cm wide and issued flows of mud, water and asphyxiating gasses. The air was charged with electricity such that sparks were observed when fingers were run through dry hair. Earthquake lights were observed throughout the Andes as moving balls of light. Waves could be seen passing over the surface of the earth." (August 13, 2025)
The maximum of the eclipse was located at 11N 102E but passed near 18N 110E
minutes earlier on August 18, 1868. The earthquakes in Peru occurred at the
antipode of this at 18S 79W. Other strong earthquakes with this solar
eclipse included an M 6.0 in Hungary on August 22, 1868 - a very rare
event.
A great earthquake of M 8.5 also occurred in Central Chile on May 25, 1751.
This earthquake was described in this summary as:
5 25 5 30 0 1751 -36.830 -71.630 0 8.5 Central Chile
Moderate damage (XI) at Chillan, Talca, Tutuben, Talco, Chile. A tsunami was generated. This was the third large Concepcion earthquake. A large foreshock on May 23 caused many to spend the night outside in readiness for additional shocks which included a strong foreshock about 15 minutes before the mainshock. The mainshock appears to have been a succession of at least six distinct events with the tsunami arriving about half an hour after the earthquake. Only 25 to 30 were killed in Concepcion due in large part to the foreshock. Chillan and Talca were destroyed and Santiago was greatly damaged. Churches and wineries were destroyed in the region. A large aftershock occurred on June 26, 1751. The location of Concepcion was abandoned after this earthquake and the city was rebuilt further inland. The generated tsunami was also destructive along the coast of Japan. Data from: "Major Earthquakes and Tsunamis in Chile during the period 1535 to 1955" by Cinna Lomnitz, Geol. Rundshau Rand 59 Vol. 3 pp 938-960, Stutgard, 1970. Readers may note the similarities between this earthquake and those of May 22-25, 1960 in the same area as described in our previous history.
Other examples of major earthquakes associated with total solar eclipses
in South America include an M 8.4 in Peru on June 23, 2001 following a
total eclipse in the same area on June 21, 2001. That earthquake was
described in this summary as:
The earthquake killed at least 75 including at least 26 by a tsunami. Nearly 18,000 homes were destroyed and more than 35,000 damaged in Arequipa, Camana and Tacna while injuring nearly 2700. Besides the 26 killed by the tsunami an additional 64 were missing. Many historic buildings were damaged or destroyed at Arequipa. Landslides blocked many highways. The earthquake followed by several days a total eclipse of the sun in the area. A tsunami was generated with maximum height to 7 meters and inundated up to 1 km inland.
An earthquake near the antipode of this event occurred on the same day in 1751
in Yunnan Province, China. This summary reported it as:
5 25 0 0 00 1751 26.500 99.900 0 6.8 CHINA
Severe damage (IX) in Yunnan Province, China. 900 killed. The magnitude is given by various sources from M 6.5-7.0. No time is currently available for this earthquake, however it is quite possible that a triggering relationship between this event and that in Central Chile (M 8.5) exists. These two events fall in the approximate antipodal areas of each other.
These two earthquakes occurred within hours of a major total solar eclipse
visible north of China (but visible at the Chinese epicenter) which maximized at the time of these earthquakes on
May 25, 1751. An earthquake of M 7.2 also occurred on May 20, 1751 in central
Japan.
An earthquake in Pakistan and Afghanistan of M 7.6 on June 9, 1956 also followed a total
solar eclipse near the antipode in the south Pacific which was visible on June 8, 1956.
The strongest earthquake felt in the world today was an M 5.3 south of Sumatra,
Indonesia. It was likely felt in the epicentral area with moderate intensity.
Earthquakes in this area of Sumatra are often coupled with antipodal
earthquakes in the region of Colombia - in this cast at 5N 77W and
a moderate to strong earthquake is likely in that area at this time. This
may be emphasized with the coming total solar eclipse.
This summary has emphasized this antipodal relation between earthquakes in
Sumatra and Colombia in previous issues. For example when an M 6.6 in Sumatra occurred
on January 14, 2022 was followed by an M 5.5 at the antipode on February 23, 2022
this summary noted:
"A moderate earthquake occurred in northern Colombia today with M 5.5.
Moderately large earthquakes in Colombia are often associated with enhanced
seismicity near the antipode in the region of Sumatra, Indonesia. A moderately
large to large earthquake is likely in the next several days in that region
due to antipodal triggering." (February 23, 2022)
and when an M 7.2 hit Colombia on November 15, 2004 this summary also related
the possibility of antipodal triggering as:
"The most damaging and deadly
earthquake in Colombia in recent years was an M 6.2 on Jan. 25, 1999 in the
area of Armenia, Colombia which killed more than 100 and left about 250,000 homeless.
Today's earthquake is the strongest ever recorded by the Preliminary
Determination of Epicenters (PDE) catalog in the area (2-6N 70-80W) of
western and central Colombia (in the past 50 years). The strongest previously
recorded event in this area was an M 7.0 on Nov. 19, 1991 about 100 km
east of today's epicenter. That earthquake had effects quite similar to
those published for today's event with two killed and 28 houses damaged in
Choco Department and minor damage in Cali and Buenaventura. It was also felt
at Quito and Guayaquil, Ecuador. Today's felt area is likely to extend to
northern Peru. ...
An earthquake of M 4.8 was located in southern Sumatra aboutthree hours after the Colombia mainshock within 100 km of the
exact antipode of the Colombia event. Events are antipodal if their longitudes
add to 180 degrees (in this case the longitude of Colombia is given as 77.6W
and that of Sumatra quake as 102.4E - a sum of exactly 180) and their signed
latitudes sum to zero (in this case the longitude of the Colombia event is 4.6N
and of the Sumatra event 5.5S - a difference of 0.9 degrees about 100 km
off of exact antipodal events). Geometric focussing at the antipode of a
major quake can produce seismic wave amplitudes which may be strong enough
to trigger antipodal activity as it appears to have done in this case." (November 15, 2004)
Today's epicenter in Sumatra is at the 10th node from Typhoon Dolphin (36 degrees)
and near the antipode of earthquakes in Venezuela and may have been promoted
by energy from those sources.
O: 09AUG2026 15:35:19 5.8S 102.7E ML=4.0 EMSC SOUTHERN SUMATRA, INDONESIA
O: 09AUG2026 15:15:04 5.8S 102.9E MW=5.3 EMSC SOUTHERN SUMATRA, INDONESIA
The strongest earthquake in the world today was an M 5.5 in the east Central Pacific
Ocean. It was not reported felt in this remote epicentral area. The last
earthquake of M>5.5 within about 300 km of this epicenter in the Central Pacific
occurred more than 35 years ago. No earthquakes in the area of moderate
magnitude have occurred in the past 35 years. This suggests regional stress
is high at this point and may lead to a strong eclipse-related regional
earthquake.
This epicenter is at the third node (120 degrees) from the landfall of Typhoon
Dolphin and may have been promoted by energy from that source.
O: 10AUG2026 05:41:44 0.3N 114.7W MB=5.5 EMSC EAST CENTRAL PACIFIC OCEAN
EMSC reported an earthquake of M 4.4 in Jalisco, Mexico was felt with intensity up to II-III in the area(s) of Jalisco, Mexico in Puerto Vallarta.
O: 10AUG2026 03:16:23 19.8N 105.6W MB=4.4 EMSC OFFSHORE JALISCO, MEXICO
EMSC reported an earthquake of M 4.4 in Western Honshu, Japan was felt with intensity up to II-III in the area(s) of Western Honshu, Japan in Fukui-shi.
NEIC reported intensity II-III in Gifu at Ono, Gifu, Amagasaki, Hyogo and in Kyoto in Kyoto and Ashiya, Japan.
O: 09AUG2026 15:48:10 35.4N 136.3E ML=4.4 EMSC WESTERN HONSHU, JAPAN
NEIC reported an earthquake of M 4.8 off eastern North Island, New Zealand was felt with intensity up to II-III in the area(s) of off eastern North Island, New Zealand in Auckland.
O: 10AUG2026 07:17:28 37.4S 177.8E MB=4.8 EMSC OFF E. COAST OF N. ISLAND, N.Z
NEIC reported an earthquake of M 3.0 in Central California was felt with intensity up to II-III in the area(s) of Central California in Bradley.
O: 10AUG2026 00:37:06 36.7N 121.4W MD=2.0 EMSC CENTRAL CALIFORNIA
O: 10AUG2026 01:19:03 36.6N 121.2W MD=2.1 EMSC CENTRAL CALIFORNIA
O: 10AUG2026 02:39:01 36.6N 121.2W MD=2.9 EMSC CENTRAL CALIFORNIA
O: 10AUG2026 02:39:54 36.6N 121.2W MD=2.8 EMSC CENTRAL CALIFORNIA
O: 10AUG2026 03:15:28 36.6N 121.2W MD=2.1 EMSC CENTRAL CALIFORNIA
NEIC reported an earthquake of M 4.0 in Hawaii was felt with intensity up to II-III in the area(s) of Hawaii in Captain Cook.
O: 10AUG2026 00:37:56 18.8N 155.3W ML=4.0 EMSC HAWAII REGION, HAWAII
O: 10AUG2026 05:13:06 18.8N 155.3W MD=3.0 EMSC HAWAII REGION, HAWAII
NEIC reported an earthquake of M 4.2 in India was felt with intensity up to II-III in the area(s) of India in Uttaranchal at Dehra Dun and Barkot.
O: 09AUG2026 19:51:32 30.8N 78.2E MB=4.2 EMSC UTTARANCHAL, INDIA
NEIC reported an earthquake of M 4.8 in Samar, Philippines was felt with intensity up to II-III in the area(s) of Samar, Philippines in Baras, Eastern Visayas.
O: 09AUG2026 17:05:42 11.4N 125.3E MB=4.8 EMSC SAMAR, PHILIPPINES
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM PEILOU (DEPRESSION 13W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS PEILOU 2026-08-10 00:00 UT 27.1N 161.0E 45 kts North Pacific
TD 15W formed today in the Northern Pacific with winds up to 45 kts. It is expected to track to the northeast and not encounter seismic areas in the next several days. The antipode at 27S 20W is not an active seismic area.
TROPICAL STORM PEILOU (DEPRESSION 13W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS PEILOU 2026-08-10 00:00 UT 21.1N 151.0E 50 kts North Pacific
TS Peilou (TD 13W) continued today in the Northern Pacific with winds up to 50 kts. It will track to the northeast and not encounter seismic areas in the next several days. The antipode at 21S 30W is not an active seismic area.
TROPICAL STORM CHAN-HOM DEPRESSION 14W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS CHAN-HOM 2026-08-10 00:00 UT 34.8N 148.7E 50 kts North Pacific
TS Chan-Hom (TD 14W) continued today in the Northern Pacific with winds up to 50 kts. It will track towards Honshu, Japan over the next several days reaching Honshu, Japan about August 11-12 and making landfall north of Tokyo. It is likely to trigger a moderate to strong earthquake near its time of landfall in Honshu, Japan. The antipode is at 35S 31W in the South Atlantic - not a seismic area.
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP DOLPHIN 2026-08-10 00:00 UT 27.9N 120.2E 80 kts West of Ryukyu Islands, Japan
Super-Typhoon Dolphin (TD 12W) continued today west of the Ryukyu Islands, Japan with winds up to 80 kts. A moderate earthquake could be triggered near landfall in the area of Japan. The antipode at 27S 60W is in the South Atlantic Ocean - an area unlikely to see seismicity at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of August 9, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
1550 1525 1548 1554 C1.1 (August 9, 2026) 1.5E-03
Southern Sumatra M 4.0 15:35 UT
Central Peru M 4.6 15:41 UT
Western Honshu M 4.4 15:48 UT
Argentina M 4.0 15:44 UT
1560 1630 1640 1646 C1.8 (August 9, 2026) 1.1E-03
Ethiopia M 4.6 17:11 UT
Samar M 4.8 17:06 UT
1570 1801 1806 1808 C1.1 (August 9, 2026) 6.4E-04
New Guinea M 4.5 18:11 UT
Fiji M 4.5 18:23 UT
1600 2026 2037 2047 C1.2 (August 9, 2026) 1.3E-03
Baja California M 3.7 20:36 UT
1610 2046 2053 2055 C1.0 (August 9, 2026) 7.4E-04
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active August 11 quiet August 10 minor storms August 12. Solar M-flare chance: 1% X-class: 1% proton storm: 1%
AP Indicies: global: 7, high: 8, mid-latitude: 9, time of max k: 09:00-12:00 UT; Max k: 3 Global Kp 2.67 0000-0300, August 9; Sunspot Number: 41; Radio Flux: 94
A minor excursion occurred in the GOES-19 geomagnetic field measured by the
magnetometer on that satellite starting abut 01:55 and maximizing around 02:05
UT on August 10. An arcjet maneuver stabilized the orbit and normal
operations resumed by 03:25 UT. An unsually large M 3.5 in Portugal was
recorded and felt at 02:08 UT and may have been related to
this geomagnetic change. EMSC reported it was felt with a loud noise in Portugal at Odemira, Porto Covo, Beja, Santiago do Cacem.
This may be of interest because the total eclipse of the sun on August 12
will pass over this epicenter. The last earthquake of M>=3.5 within about
150 km of this epicenter in Portugal with M>=3.5 was an M 4.4 on March 24, 2025 and an M 4.8 on February 17, 2025.
At the time this summary noted:
"A moderate earthquake of M 4.8 was felt widely in the area of Portugal near Lisbon today. NEIC reported intensity up to VI (with minor damage) in Portugal in the Lisbon area at Alenquer and in Leiria Centro and in Huelva, Spain. Intensity V was felt near Lisbon at Alverca do Ribatejo, Baixa de Banheira, Famoes Poceirao, Pragal, Trafaria, Unhos with IV in Almada, Amadora, Amora, Arrentela, Barreiro, Cacilhas, Camarate, Carnaxide, Charneca de Caparica, Corroios, Cost da Caparica, Estoril, Fernao, Linda-a-Velha, Oeiras, Paco de Arcos, Santo Antonio da Charneca, Sesimbra, Sobreda, Vialonga, Barcelos and Moreira, North Portugal. Lesser shaking was reported in Italy.
EMSC reported strong shaking in Portugal. Reports of light intensity came from as far as Gibraltar and Marbella, Spain more than 400 km from the epicenter.
This earthquake occurred within minutes of local solar noon and may have been
promoted by tidal or geomagnetic effects which maximize near this hour.
This is the strongest earthquake felt in Portugal since an M 5.4 on August 26, 2024.
The only other event of M>=4.8 in Portugal in the past 35 years was an M 4.8 on September 4, 2018.
Today's earthquake could be the largest aftershock to date of the M 5.4 in August, 2024.
At the time this summary noted:
"A moderately strong earthquake of M 5.4 was widely felt in Portugal today. It occurred
near the antipode of an earlier M 6.9 in Tonga and may have been related to
antipodal focusing of seismic energy at the antipode of that epicenter. NEIC reported
the earthquake in Portugal was felt with maximum intensity VII in Lisbon, Portugal at Benedita Lisboa e Vale do Tejo and VI in Portugal at Ponte Norte, Sines Alenteho with V in Trafaria Lisboa e Vale do Tejo, Santa Barbara de Nexe, Monte Redondo, Moita, Loures, Castro, Carregado, Bucelas, Bombarral, Arrentela, Alferrarede, Lisbon, and with lesser shaking throughout Portugal and portions of Spain.
EMSC reported a possible minor tsunami with maximum shaking in Portugal near the
towns of Sines, Zambujal de Cima, with a great deal of noise. Euro Weekly News reported no major damage or injuries with this earthquake.
The last earthquake located near Portugal with M>=5.4 occurred more than 35 years ago. The only
comparable event in the past 35 years occurred with M 5.4-5.5 on December 17, 2009 and January 10, 2006.
At the time this summary noted:
"A moderately strong earthquake of M 5.7-6.3 hit west of Gibraltar today and
was felt widely in Portugal, Spain and Morocco. Spain's Seismological Institute
gave the M 6.3 while NEIC gave M 5.7. The most likely magnitude given the
widely felt region is M 6.3. Reports from NEIC often underestimate the magnitude
of larger events initially and give larger values at a later time. NEIC reported maximum intensity
VI in Odemira, Alentjo, Portugal and V in Portugal at Boliqueime, A dos Cunhadoa, Aljezur, Azambuja, Baixa de Banheira,
Castanheira do Ribatejo, Grandola, Lagoa, Luz, Malveira, Mealhada, Monchique,
Montenegro, Pampilhosa, Portimao, Porto de Mos, Soure, Queijas, Rio Maior, Serpa, Serta,
in Spain at Caceres, and in Morocco at Khouribga and Settat. Intensity IV was generally
felt within about 300 km of the epicenter; III within about 500 km and II within
500-700 km from the epicenter. Spanish media reported the quake was also felt
in Seville, Cordoba and Huelva, Spain. The epicenter is located near the presumed
epicenter of the great Lisbon earthquake of November 1, 1755 which destroyed
along with a tsunami much of the built coast of Portugal." (December 17, 2009, August 26, 2024)
Like the M 5.1 in Gibraltar of February 10, 2025 today's epicenter is at 103 degrees
from the Kyushu M 6.8 of January 13, 2025 and may have been promoted by energy
from that source. This summary noted this possibility in an earlier issue as:
"Minor seismicity continued near the Strait of Gibraltar today but not as aftershocks of the
This suggests an expanding seismic field following the M 5.1 of February 10, 2025.
Other area, besides Morocco and the Strait of Gibraltar which could see significant
seismicity in the area in the next week include Spain and Portugal, both of which
see events of M>=4.5 on occasion. Like the activity in southern Texas today
these events are located near 103 degrees from the M 6.8 in Kyushu, Japan of January 13 and may have been promoted by energy from that source." (February 15, 2025)
The antipode of the event in Portugal today is in North Island, New Zealand,
an active seismic area which may see minor enhancement in seismicity in the
next several days." (February 17, 2025)
O: 10AUG2026 02:08:23 37.6N 8.4W ML=3.5 EMSC PORTUGAL
The Hp30 index (GFZ) did not exceed 3 today. No geomagnetic storms were observed.
August 9, 2026
Notable earthquakes and events:
The current quiet days in global seismicity may change in the next several days as a total
eclipse of the sun will occur on August 12, 2026. This eclipse will be total near
Iceland and Greenland at its peak with the greatest eclipse at 65N 25W over Iceland and will also be total in the area
of Spain, Portugal, Southern France and northern Italy. These areas could
see significantly enhanced seismicity beginning in several days. This
eclipse will be partial in the northeastern U.S. and throughout Canada.
In the previous summary some further discussion on several notable
eclipse-earthquake couples had been promised in today's summary issue.
There have been several notable associations between total solar eclipses
and major earthquakes in the region Europe in recent history. A major
solar eclipse occurred on August 29, 1886 with peak off the coast of
Africa and Southwestern Europe. This was associated with an M 8.4+
earthquake in Greece two days earlier and an M 7.7 in Charleston, South Carolina on
August 31, 1886. Foreshocks in Charleston however, began at the time of the
eclipse. Another example was the M 7.8 in the Marmara Sea of Turkey. A
major solar eclipse was visible over this area on August 11, 1999 and the
earthquake occurred on August 17, 1999 killing tens of thousands and
causing massive destruction in Turkey. Another example of a European
seismic association with a major solar eclipse occurre when an eclipse
with maximum total eclipse time occurred in Spain on August 20, 1905.
This was followed eight days later on September 8, 1905 by one of the
strongest recent earthquakes in Europe - an M 7.9 in Messina, Italy.
This summary noted this earthquake caused 2500 or more lives in Calabria, Italy.
While there are many eclipses seen in Europe which do not associate with major
regional earthquakes these three are particularly notable because
of the short time between eclipse and earthquake and the size of
these earthquakes - in all three cases, among the largest in Europe
in the past 150 years.
Generally quiet conditions continued in global seismicity today. The only
earthquake of M>5.0 were of M 5.6 in the East Pacific Rise and an M 5.6 near the east coast of northern Honshu, Japan.
This event in Honshu may have been promoted by the landfall of Typhoon Dolphin to the
south of this today as suggested in previous summaries:
"Super-Typhoon Dolphin (TD 12W) continued today in the north-central Pacific with winds up to 135 kts. It is expected to reach the Bonin Islands, Japan today and may help trigger moderate regional seismicity near landfall. It will then track towards southern Honshu and the Ryukyu Islands reaching that area with winds up to 125 kts. A moderate earthquake could be triggered near landfall in that area." (August 3-6, 2026)
The Japanese earthquake was reported by NEIC to have been felt with intensity
IV in Hachinohe, Aomori and II in Sendai, Miyagi, Japan.
This epicenter is at 104 degrees from Chiapas, Mexico and may have been
promoted by energy from that source.
O: 08AUG2026 17:58:00 40.2N 142.3E MW=5.6 EMSC NEAR EAST COAST OF HONSHU,
O: 08AUG2026 06:59:50 39.9N 140.1E mb=4.3 EMSC EASTERN HONSHU, JAPAN
A moderate geomagnetic storm appears to have begun around 10:00 on August 8, 2026.
Peak Hp30 (GFZ) index reached 6 around 12:15 UT with this storm.
A moderately strong earthquake of M 5.6 in the area Southeast of Easter
Island occurred at the beginning of this storm and may have been
promoted by energy associated with it.
This epicenter is at 145 degrees from Kyushu and from the current location
of the eye of Typhoon Dolphin and may have been promoted by constructive
interference of energy from those sources.
This earthquake in the South Pacific is the strongest within about 200 km
of this epicenter since an M 5.7 on January 28, 2025. At the time this summary noted:
"The second strongest earthquake in the world today was an M 5.7 southeast of Easter Island,
South Pacific Ocean. It was preceded by an M 5.2 foreshock about 32 minutes
earlier.
This epicenter is at 145 degrees from the M 6.8 in Kyushu, Japan of January 13, 2025 -
a distance at which seismic energy reflected and refracted off the inner-outer earth
core boundary returns to the surface and also at the fifth node (72X2 degrees).
Seismicity from strong earthquake often is seen to be enhanced at this distance
following those earthquakes." (January 28, 2025)
O: 08AUG2026 13:49:30 41.3S 90.8W ML=4.6 EMSC SOUTHEAST OF EASTER ISLAND
O: 08AUG2026 11:41:27 41.5S 90.1W ML=5.6 NEIC SOUTHEAST OF EASTER ISLAND
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026. The strongest events
in the area today was an M 4.5.
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 08AUG2026 09:49:52 13.9N 93.1W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 09AUG2026 02:40:57 14.0N 93.3W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 08AUG2026 09:12:08 14.1N 93.0W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 08AUG2026 20:54:08 14.1N 93.1W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 08AUG2026 09:13:43 14.2N 93.0W mb=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 08AUG2026 22:02:17 14.2N 93.1W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 08AUG2026 22:45:16 14.2N 93.3W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 08AUG2026 22:08:19 14.4N 93.1W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 08AUG2026 12:28:59 14.7N 92.4W ML=4.5 EMSC CHIAPAS, MEXICO
O: 08AUG2026 10:43:26 14.8N 93.0W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
NEIC reported an earthquake of M 4.6 in Central Peru was felt with intensity up to II-III in the area(s) of Central Peru in Orcotuna, Junin and in Lima.
EMSC reported moderate shaking in Peru at Chupaca and Pilcomayo.
This earthquake occurred near local solar midnight and may have been promoted
by tidal and/or geomagnetic effects.
O: 09AUG2026 04:05:44 12.1S 75.5W MB=4.6 EMSC CENTRAL PERU
NEIC reported an earthquake of M 2.9 in Central California was felt with intensity up to II-III in the area(s) of Central California in Lompoc.
O: 09AUG2026 06:37:39 34.5N 120.5W ML=2.9 EMSC CENTRAL CALIFORNIA
O: 09AUG2026 05:12:24 34.5N 120.5W ML=2.5 EMSC CENTRAL CALIFORNIA
NEIC reported an earthquake of M 4.9 in Andreanof Islands, Alaska was felt with intensity up to II-III in the area(s) of Andreanof Islands, Alaska in Atka.
O: 09AUG2026 03:36:17 52.0N 173.3W MB=4.9 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
NEIC reported an earthquake of M 4.6 in Central Turkey was felt with intensity up to II-III in the area(s) of Central Turkey in Gaziantep and Nurdagi.
EMSC reported strong shaking in Turkey at Nurdagi, Bahce, Sahinbey, Sehitkamil, Gaziantep, Narli, Zeytinli, Osmaniye, and in Syria at I'zaz and as far as 100 km in Aleppo, Syria.
O: 09AUG2026 00:42:17 37.1N 36.9E ML=4.6 EMSC CENTRAL TURKEY
NEIC reported an earthquake of M 4.3 in Kyushu, Japan was felt with intensity up to II-III in the area(s) of Kyushu, Japan in Kunitomi, Miyazaki.
O: 08AUG2026 23:02:07 32.5N 130.4E ML=4.2 EMSC KYUSHU, JAPAN
O: 08AUG2026 23:02:07 32.5N 130.4E ML=4.3 NEIC KYUSHU, JAPAN
NEIC reported an unusual earthquake of M 4.9 in the Northern Mid-Atlantic Ridge was not felt in this remote area.
The last earthquake with M>=4.9 within about 200 km of this epicenter in the
Northern Mid-Atlantic occurred as an M 5.9 on December 27, 2024. At the time
this summary noted:
"The strongest earthquake in the world today was an M 5.9 in the Northern Mid-Atlantic Ridge. It was not reported felt in this remote area.
This epicenter is at 150 degrees from the M 7.4 in Vanuatu of December 17 and may be a FFA of that event.
Strong seismicity increases often occur in the range from about 142 to 150 degress from the
epicenter following major earthquakes - a distance range in which core reflections and refractions of seismic
energy is concentrated at the surface.
...
The earthquake of M 5.9 is the strongest recorded within about 200 km of this epicenter
since an M 5.9 on June 30, 2017. At the time this summary noted:
"... an unusual earthquake of M 5.4-5.5 occurred in the North Atlantic Ocean. The largest previous earthquake during
2017 along the Atlantic Ridge was an M 5.4 near Ascension Island. This is
the strongest earthquake in the mid-Northern Atlantic region within about 250
km of this epicenter since an M 5.7 on November 18, 2011. ..." (June 30, 2017, December 27, 2024)
This epicenter is in the general area where the total solar eclipse will
be visible on August 12, 2026. It is at the seventh node (52 degrees)
from Chiapas and at the third node (120 degrees) from the landfall of Typhoon Dolphin
and may have been promoted by energy from those sources.
O: 08AUG2026 22:09:05 33.8N 38.1W MW=4.9 EMSC NORTHERN MID-ATLANTIC RIDGE
NEIC reported an earthquake of M in was felt with intensity up to II-III in the area(s) of
NEIC reported an earthquake of M 3.4 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in Garberville, Covelo, Piercy and Alderpoint.
O: 08AUG2026 15:33:22 40.0N 123.4W ML=3.4 EMSC NORTHERN CALIFORNIA
EMSC reported an earthquake of M 2.3 in Portugal was felt with intensity up to IV in the area(s) of Portugal with a noise an Monchique.
O: 08AUG2026 07:05:36 37.4N 8.5W ML=2.3 EMSC PORTUGAL
EMSC reported an earthquake of M 5.0 in the Nicobar Islands, India was felt with intensity up to IV in the area(s) of the Nicobar Islands, India in Lampuyang, Indonesia.
O: 09AUG2026 03:02:07 7.0N 94.1E MB=5.0 EMSC NICOBAR ISLANDS, INDIA REGION
EMSC reported an earthquake of M 3.9 in Yemen was felt with intensity up to IV in the area(s) of Yemen in Ad Dann, Dhi as Sufal and Markaz Mudhaykirah.
O: 08AUG2026 22:35:37 14.0N 43.8E ML=3.9 EMSC YEMEN
EMSC reported an earthquake of M 4.3 in Gujarat, India was felt with intensity up to IV in the area(s) of Gujarat, India in Surgana, Nashik, Ozar. Deolali, Lasalgaon, Chandor, Manmad, Sangamner.
This epicenter is at 143 degrees from Chiapas, Mexico and at 51.5 degrees (node 7) from
Kyushu, Japan and was likely promoted by energy from those sources.
O: 08AUG2026 16:30:59 20.4N 73.7E ML=4.3 EMSC GUJARAT-MAHARASHTRA BORD., IND
EMSC reported an earthquake of M 3.5 in Austria was felt with intensity up to IV in the area(s) of Austria in Mils bei Solbad Hall, Hall in Tirol, Heiligkreuz, Absam, Mils, Thaur, Rinn, Ampass, Volders, Gnadenwald, Aldrans, Arzl, Wattenberg, Sistrans, Innsbruck, Weer, Muhlau, Terfens, Wilten, Vill, Hotting, Ellbogen, Gnadenwald, Gotzens, Grinzens, Scharnitz.
This epicenter is at the fourth node (90 degrees) from Typhoon Dolphin and Chiapas, Mexico
and may have been promoted by constructive interference of enery from those sources.
O: 08AUG2026 04:42:42 47.3N 11.5E ML=3.5 EMSC AUSTRIA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM PEILOU (DEPRESSION 13W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS PEILOU 2026-08-09 00:00 UT 21.2N 142.7E 45 kts North Pacific
TS Peilou (TD 13W) continued today in the Northern Pacific with winds up to 45 kts. It will track to the northeast and not encounter seismic areas in the next several days. Some seismicity in the Volcano Islands and northern Mariana Islands could be promoted as this storm passes through the area.
TROPICAL STORM CHAN-HOM DEPRESSION 14W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS CHAN-HOM 2026-08-09 00:00 UT 32.3N 150.7E 45 kts North Pacific
TS Chan-Hom (TD 14W) continued today in the Northern Pacific with winds up to 45 kts. It will track towards Honshu, Japan over the next several days reaching Honshu, Japan about August 11 and making landfall north of Tokyo. While no seismicity is expected at this time, it is likely to trigger a moderate to strong earthquake near its time of landfall in Honshu, Japan. The antipode is at 33S 40W in the South Atlantic - not a seismic area.
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP DOLPHIN 2026-08-09 00:00 UT 27.9N 120.2E 80 kts West of Ryukyu Islands, Japan
Super-Typhoon Dolphin (TD 12W) continued today west of the Ryukyu Islands, Japan with winds up to 80 kts. A moderate earthquake could be triggered near landfall in the area of Japan. The antipode at 27S 60W is in the South Atlantic Ocean - an area unlikely to see seismicity at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of August 8, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
There were no C- or higher class solar flares observed by SWPC today.
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active August 9 and 11 quiet August 10. Solar M-flare chance: 5% X-class: 1% proton storm: 1%
AP Indicies: global: 27, high: 33, mid-latitude: 13, time of max k: 15:00-17:00 UT; Max k: 6 Global Kp 5.67 1900-2100, August 8; Sunspot Number: 62; Radio Flux: 94
The Hp30 index (GFZ) did not exceed 3 today. No geomagnetic storms were observed.
A moderate geomagnetic storm appears to have begun around 10:00 on August 8, 2026.
Peak Hp30 (GFZ) index reached 6.67 around 20:30-21:00 UT with this storm.
August 8, 2026
Notable earthquakes and events:
The current quiet days in global seismicity may change in the next several days as a total
eclipse of the sun will occur on August 12, 2026. This eclipse will be total near
Iceland and Greenland at its peak with the greatest eclipse at 65N 25W over Iceland and will also be total in the area
of Spain, Portugal, Southern France and northern Italy. These areas could
see significantly enhanced seismicity beginning in several days. This
eclipse will be partial in the northeastern U.S. and throughout Canada.
In the previous summary some further discussion on several notable
eclipse-earthquake couples had been promised in today's summary issue.
There have been several notable associations between total solar eclipses
and major earthquakes in the region Europe in recent history. A major
solar eclipse occurred on August 29, 1886 with peak off the coast of
Africa and Southwestern Europe. This was associated with an M 8.4+
earthquake in Greece two days earlier and an M 7.7 in Charleston, South Carolina on
August 31, 1886. Foreshocks in Charleston however, began at the time of the
eclipse. Another example was the M 7.8 in the Marmara Sea of Turkey. A
major solar eclipse was visible over this area on August 11, 1999 and the
earthquake occurred on August 17, 1999 killing tens of thousands and
causing massive destruction in Turkey. Another example of a European
seismic association with a major solar eclipse occurre when an eclipse
with maximum total eclipse time occurred in Spain on August 20, 1905.
This was followed eight days later on September 8, 1905 by one of the
strongest recent earthquakes in Europe - an M 7.9 in Messina, Italy.
This summary noted this earthquake caused 2500 or more lives in Calabria, Italy.
While there are many eclipses seen in Europe which do not associate with major
regional earthquakes these three are particularly notable because
of the short time between eclipse and earthquake and the size of
these earthquakes - in all three cases, among the largest in Europe
in the past 150 years.
Generally quiet conditions continued in global seismicity today. The only
earthquake of M>5.0 were of M 5.6 in the East Pacific Rise and an M 5.6 near the east coast of northern Honshu, Japan.
This event in Honshu may have been promoted by the landfall of Typhoon Dolphin to the
south of this today as suggested in previous summaries:
"Super-Typhoon Dolphin (TD 12W) continued today in the north-central Pacific with winds up to 135 kts. It is expected to reach the Bonin Islands, Japan today and may help trigger moderate regional seismicity near landfall. It will then track towards southern Honshu and the Ryukyu Islands reaching that area with winds up to 125 kts. A moderate earthquake could be triggered near landfall in that area." (August 3-6, 2026)
The Japanese earthquake was reported by NEIC to have been felt with intensity
IV in Hachinohe, Aomori and II in Sendai, Miyagi, Japan.
This epicenter is at 104 degrees from Chiapas, Mexico and may have been
promoted by energy from that source.
O: 08AUG2026 17:58:00 40.2N 142.3E MW=5.6 EMSC NEAR EAST COAST OF HONSHU,
O: 08AUG2026 06:59:50 39.9N 140.1E mb=4.3 EMSC EASTERN HONSHU, JAPAN
A moderate geomagnetic storm appears to have begun around 10:00 on August 8, 2026.
Peak Hp30 (GFZ) index reached 6 around 12:15 UT with this storm.
A moderately strong earthquake of M 5.6 in the area Southeast of Easter
Island occurred at the beginning of this storm and may have been
promoted by energy associated with it.
This epicenter is at 145 degrees from Kyushu and from the current location
of the eye of Typhoon Dolphin and may have been promoted by constructive
interference of energy from those sources.
This earthquake in the South Pacific is the strongest within about 200 km
of this epicenter since an M 5.7 on January 28, 2025. At the time this summary noted:
"The second strongest earthquake in the world today was an M 5.7 southeast of Easter Island,
South Pacific Ocean. It was preceded by an M 5.2 foreshock about 32 minutes
earlier.
This epicenter is at 145 degrees from the M 6.8 in Kyushu, Japan of January 13, 2025 -
a distance at which seismic energy reflected and refracted off the inner-outer earth
core boundary returns to the surface and also at the fifth node (72X2 degrees).
Seismicity from strong earthquake often is seen to be enhanced at this distance
following those earthquakes." (January 28, 2025)
O: 08AUG2026 13:49:30 41.3S 90.8W ML=4.6 EMSC SOUTHEAST OF EASTER ISLAND
O: 08AUG2026 11:41:27 41.5S 90.1W ML=5.6 NEIC SOUTHEAST OF EASTER ISLAND
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026. The strongest events
in the area today was an M 4.5.
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 08AUG2026 09:49:52 13.9N 93.1W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 09AUG2026 02:40:57 14.0N 93.3W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 08AUG2026 09:12:08 14.1N 93.0W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 08AUG2026 20:54:08 14.1N 93.1W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 08AUG2026 09:13:43 14.2N 93.0W mb=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 08AUG2026 22:02:17 14.2N 93.1W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 08AUG2026 22:45:16 14.2N 93.3W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 08AUG2026 22:08:19 14.4N 93.1W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 08AUG2026 12:28:59 14.7N 92.4W ML=4.5 EMSC CHIAPAS, MEXICO
O: 08AUG2026 10:43:26 14.8N 93.0W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
NEIC reported an earthquake of M 4.6 in Central Peru was felt with intensity up to II-III in the area(s) of Central Peru in Orcotuna, Junin and in Lima.
EMSC reported moderate shaking in Peru at Chupaca and Pilcomayo.
This earthquake occurred near local solar midnight and may have been promoted
by tidal and/or geomagnetic effects.
O: 09AUG2026 04:05:44 12.1S 75.5W MB=4.6 EMSC CENTRAL PERU
NEIC reported an earthquake of M 2.9 in Central California was felt with intensity up to II-III in the area(s) of Central California in Lompoc.
O: 09AUG2026 06:37:39 34.5N 120.5W ML=2.9 EMSC CENTRAL CALIFORNIA
O: 09AUG2026 05:12:24 34.5N 120.5W ML=2.5 EMSC CENTRAL CALIFORNIA
NEIC reported an earthquake of M 4.9 in Andreanof Islands, Alaska was felt with intensity up to II-III in the area(s) of Andreanof Islands, Alaska in Atka.
O: 09AUG2026 03:36:17 52.0N 173.3W MB=4.9 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
NEIC reported an earthquake of M 4.6 in Central Turkey was felt with intensity up to II-III in the area(s) of Central Turkey in Gaziantep and Nurdagi.
EMSC reported strong shaking in Turkey at Nurdagi, Bahce, Sahinbey, Sehitkamil, Gaziantep, Narli, Zeytinli, Osmaniye, and in Syria at I'zaz and as far as 100 km in Aleppo, Syria.
O: 09AUG2026 00:42:17 37.1N 36.9E ML=4.6 EMSC CENTRAL TURKEY
NEIC reported an earthquake of M 4.3 in Kyushu, Japan was felt with intensity up to II-III in the area(s) of Kyushu, Japan in Kunitomi, Miyazaki.
O: 08AUG2026 23:02:07 32.5N 130.4E ML=4.2 EMSC KYUSHU, JAPAN
O: 08AUG2026 23:02:07 32.5N 130.4E ML=4.3 NEIC KYUSHU, JAPAN
NEIC reported an unusual earthquake of M 4.9 in the Northern Mid-Atlantic Ridge was not felt in this remote area.
The last earthquake with M>=4.9 within about 200 km of this epicenter in the
Northern Mid-Atlantic occurred as an M 5.9 on December 27, 2024. At the time
this summary noted:
"The strongest earthquake in the world today was an M 5.9 in the Northern Mid-Atlantic Ridge. It was not reported felt in this remote area.
This epicenter is at 150 degrees from the M 7.4 in Vanuatu of December 17 and may be a FFA of that event.
Strong seismicity increases often occur in the range from about 142 to 150 degress from the
epicenter following major earthquakes - a distance range in which core reflections and refractions of seismic
energy is concentrated at the surface.
...
The earthquake of M 5.9 is the strongest recorded within about 200 km of this epicenter
since an M 5.9 on June 30, 2017. At the time this summary noted:
"... an unusual earthquake of M 5.4-5.5 occurred in the North Atlantic Ocean. The largest previous earthquake during
2017 along the Atlantic Ridge was an M 5.4 near Ascension Island. This is
the strongest earthquake in the mid-Northern Atlantic region within about 250
km of this epicenter since an M 5.7 on November 18, 2011. ..." (June 30, 2017, December 27, 2024)
This epicenter is in the general area where the total solar eclipse will
be visible on August 12, 2026. It is at the seventh node (52 degrees)
from Chiapas and at the third node (120 degrees) from the landfall of Typhoon Dolphin
and may have been promoted by energy from those sources.
O: 08AUG2026 22:09:05 33.8N 38.1W MW=4.9 EMSC NORTHERN MID-ATLANTIC RIDGE
NEIC reported an earthquake of M in was felt with intensity up to II-III in the area(s) of
NEIC reported an earthquake of M 3.4 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in Garberville, Covelo, Piercy and Alderpoint.
O: 08AUG2026 15:33:22 40.0N 123.4W ML=3.4 EMSC NORTHERN CALIFORNIA
EMSC reported an earthquake of M 2.3 in Portugal was felt with intensity up to IV in the area(s) of Portugal with a noise an Monchique.
O: 08AUG2026 07:05:36 37.4N 8.5W ML=2.3 EMSC PORTUGAL
EMSC reported an earthquake of M 5.0 in the Nicobar Islands, India was felt with intensity up to IV in the area(s) of the Nicobar Islands, India in Lampuyang, Indonesia.
O: 09AUG2026 03:02:07 7.0N 94.1E MB=5.0 EMSC NICOBAR ISLANDS, INDIA REGION
EMSC reported an earthquake of M 3.9 in Yemen was felt with intensity up to IV in the area(s) of Yemen in Ad Dann, Dhi as Sufal and Markaz Mudhaykirah.
O: 08AUG2026 22:35:37 14.0N 43.8E ML=3.9 EMSC YEMEN
EMSC reported an earthquake of M 4.3 in Gujarat, India was felt with intensity up to IV in the area(s) of Gujarat, India in Surgana, Nashik, Ozar. Deolali, Lasalgaon, Chandor, Manmad, Sangamner.
This epicenter is at 143 degrees from Chiapas, Mexico and at 51.5 degrees (node 7) from
Kyushu, Japan and was likely promoted by energy from those sources.
O: 08AUG2026 16:30:59 20.4N 73.7E ML=4.3 EMSC GUJARAT-MAHARASHTRA BORD., IND
EMSC reported an earthquake of M 3.5 in Austria was felt with intensity up to IV in the area(s) of Austria in Mils bei Solbad Hall, Hall in Tirol, Heiligkreuz, Absam, Mils, Thaur, Rinn, Ampass, Volders, Gnadenwald, Aldrans, Arzl, Wattenberg, Sistrans, Innsbruck, Weer, Muhlau, Terfens, Wilten, Vill, Hotting, Ellbogen, Gnadenwald, Gotzens, Grinzens, Scharnitz.
This epicenter is at the fourth node (90 degrees) from Typhoon Dolphin and Chiapas, Mexico
and may have been promoted by constructive interference of enery from those sources.
O: 08AUG2026 04:42:42 47.3N 11.5E ML=3.5 EMSC AUSTRIA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM PEILOU (DEPRESSION 13W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS PEILOU 2026-08-09 00:00 UT 21.2N 142.7E 45 kts North Pacific
TS Peilou (TD 13W) continued today in the Northern Pacific with winds up to 45 kts. It will track to the northeast and not encounter seismic areas in the next several days. Some seismicity in the Volcano Islands and northern Mariana Islands could be promoted as this storm passes through the area.
TROPICAL STORM CHAN-HOM DEPRESSION 14W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS CHAN-HOM 2026-08-09 00:00 UT 32.3N 150.7E 45 kts North Pacific
TS Chan-Hom (TD 14W) continued today in the Northern Pacific with winds up to 45 kts. It will track towards Honshu, Japan over the next several days reaching Honshu, Japan about August 11 and making landfall north of Tokyo. While no seismicity is expected at this time, it is likely to trigger a moderate to strong earthquake near its time of landfall in Honshu, Japan. The antipode is at 33S 40W in the South Atlantic - not a seismic area.
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP DOLPHIN 2026-08-09 00:00 UT 27.9N 120.2E 80 kts West of Ryukyu Islands, Japan
Super-Typhoon Dolphin (TD 12W) continued today west of the Ryukyu Islands, Japan with winds up to 80 kts. A moderate earthquake could be triggered near landfall in the area of Japan. The antipode at 27S 60W is in the South Atlantic Ocean - an area unlikely to see seismicity at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of August 8, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
There were no C- or higher class solar flares observed by SWPC today.
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active August 9 and 11 quiet August 10. Solar M-flare chance: 5% X-class: 1% proton storm: 1%
AP Indicies: global: 27, high: 33, mid-latitude: 13, time of max k: 15:00-17:00 UT; Max k: 6 Global Kp 5.67 1900-2100, August 8; Sunspot Number: 62; Radio Flux: 94
The Hp30 index (GFZ) did not exceed 3 today. No geomagnetic storms were observed.
A moderate geomagnetic storm appears to have begun around 10:00 on August 8, 2026.
Peak Hp30 (GFZ) index reached 6.67 around 20:30-21:00 UT with this storm.
August 8, 2026
Notable earthquakes and events:
Global seismicity was at quiet levels today. Only one earthquake was
recorded with M>5.0 in the past 24 hours - an M 5.6 in Central Alaska.
This quiet may reflect the lack of strong triggering agents at this time.
There were no solar flares of C- or greater class; the geomagnetic field
was extremely quiet not exceeding Kp 2 during the day and ocean storms
had quieted or dissipated. These conditions often lead to quiet days
in global seismicity. This may change in the next several days as a total
eclipse of the sun will occur on August 12, 2026. This eclipse will be total near
Iceland and Greenland at its peak with the greatest eclipse at 65N 25W over Iceland and will also be total in the area
of Spain, Portugal, Southern France and northern Italy. These areas could
see significantly enhanced seismicity beginning in several days. This
eclipse will be partial in the northeastern U.S. and throughout Canada.
A full discussion of the seismic possibilities with this eclipse will
be presented in the next issue of this summary.
NEIC reported the earthquake in Central Alaska of M 5.2-5.6 was widely felt
in that epicentral area. Intensity IV was reported from Alaska at Cantwell, Manley Hot Springs, Skwentna; III in Matanuska-Susitna Borough, McGrath, Cooper Landing , Anchorage, Denali National Park, Tyonek and Fairbanks. It was reported lightly felt as far as 300 km from the epicenter.
The last earthquake within about 200 km of this epicenter in Central Alaska
with M>=5.6 was an M 6.0 on November 27, 2025. The last such event within
about 150 km of this epicenter was an M 6.3 on May 1, 1991. At the time o
of the M 6.0 in November, 2025, this summary noted:
"A strong earthquake of M 6.0 shook the areas near Anchorage, and Elmendorf AFB, Alaska today.
More than 7000 responses from citizens in the area to NEIC revealed it was felt
with intensity V in Alaska at Anchorage, Talkeetna, Willow, Palmer, IV in Matanuska-Susitna Borough, Chugia, Clam Gulch, Skwentana, Eagle River, Wasilla, Girdwood, Kenai, Elmendorf AFB, Fort Richarson, Indian, Cooper Landing, Kasilof, with intensity III as far as about 400 km from the epicenter.
No tsunami was expected nor observed with this earthquake. This earthquake
occurred at the peak of a high latitude geomagnetic storm with k-index of 7
and was probably promoted by that storm (see above). It is also near 100 degrees
from the earlier M 6.6 in Sumatra and the accompanying eye of Tropical Cyclone
Senyar today and at the eighth node (45 degrees) from northern Honshu, Japan today may have been promoted by energy
from those sources. This area has seen
a series of minor foreshocks in the past several days, but the last earthquake
within about 200 km of this epicenter with M>=6 occurred on November 30, 2018 with M 7.0.
At the time this summary noted:
"A major earthquake of M 7.0 occurred near Anchorage, Alaska today. No deaths or tsunami were reported with the quake but much damage to infrastructure occurred. The area
has seen a continuing series of moderate to strong earthquakes over the past several months
and, as a high latitude quake, was part of the activation of high latitude
seismicity seen over the past two week. The year 2018 has been very active for Alaska.
A great earthquake of M 7.9 hit the Gulf of Alaska on January 23, 2018. This was
followed by an M 6.4 and series in northern Alaska beginning on August 12, 2018 and an M 6.6 on August 15, 2018 in the Andreanof Islands.
The last regional earthquake with M>=7 within about 300 km of today's epicenter
was an M 7.1 on January 24, 2016 about 300 km to the southwest at intermediate focus which prevented damage on January 24, 2016.
This summary at the time noted activity in Nebraska and other unusual seismicity
as precursory to this event. Interested readers are urged to revisit that and
other summaries for more information.
The current activation of seismicity at high latitudes began in mid-November as noted
in this summary and continued through late November. The initial activation
was noted as:
"A new geomagnetic storm may begin today and will help to shape the aftershocks
in Alaska.
NEIC reported the mainshock of M 7.0 was felt with damage with intensity VIII in Eagle River, VII in Willow, Trapper Creek, Chugiak, Anchorage, Talkeetna, Sterling, Palmer, Denali National Park, Elmendorf AFB, Anchorage, Light intensity shaking with intensity II-III was reported as far as 1000 km from the epicenter with intensity IV-V as far as 500 km from the epicenter including at Fairbanks and Kodiak. Many aftershocks were reported felt with intensity as high as VI, especially in the Anchorage, Chugiak, Elmendorf AFB, Fort Richardson, and Wasilla areas of Southern Alaska.
Initial reports indicate no one was killed in this earthquake. Roads and other
infrastructure was not as lucky however, Pictures on the internet show buckled
highways in the region. Highways into and out of Anchorage were closed and gas lines
were ruptured. Power was out to many. There was damage to roads and bridges but
no major structural collapses of buildings were reported. Portionis of the Glenn Highway
disappeared. Seiche was observed. Becase of wintry conditions, most of the repair
work will have to wait till Spring." (November 30, 2018)
An earthquake of M 6.1 also occurred about 200 km northeast of today's epicenter
on May 31, 2021 which was described in this summary at the time as:
"The strongest earthquake in the world today was an M 6.1 in the region of central Alaska. NEIC reported it was felt with maximum intensity V in Alaska at Glennallen, Eagle River, and Talkeetna and IV in Maranuska-Sustina border, Palmer, Cantwell, Chugiak, Wasilla, Willow, and Fort Richardson.
An M 3.2 regional foreshock occurred about an hour earlier and was reported felt with intensity IV in Anchorage and II-III in Valdez, Seward, Fairbanks and Port Wainwright.
An earlier foreshock of M 3.4 was also felt with intensity II in Talkeetna and Chugiak, Alaska.
No major damage was reported from these earthquakes. The last earthquake in
Central Alaska within about 200 km of today's epicenter with M>=6.1 occurred on November 30, 2018
near Anchorage, Alaska with M 7.0 about 150 km southwest of today's epicenter.
The largest earthquake in the area in the past 30 years was an M 7.9 in the
Denali National Park on November 3, 2002 about 150 km northeast of today's epicenter.
Other earthquakes of M>=6.1 in the past 30 years occurred on September 25, 2014 (M 6.2);
October 23, 2002 (M 6.7) and May 1, 1991 (M 6.3). Forecast 134213 had expected today's event within about 100 km was likely
around May 27.
...
Today's event is located at 101-102 degrees from the M 6.6 in Sumatra of May 14, 2021"(May 31, 2021)
The last earthquake (and possible regional foreshock) near 200 km of today's
epicenter was an M 5.4 on October 30, 2025. At the time this summary noted
in this regard:
"The strongest earthquake felt in the world today was an M 5.4 in the Kenai, Alaska area. NEIC reported it was felt with intensity V in Alaska at Cooper Landing; IV in Homer, Anchor Point, Seward, Clam Gulch, Kenai, Soldotna, Moose Pass and III in Sterling and Girdwood.
EMSC reported moderate shaking in Alaska at Diamond Ridge, Seward, Honer, MacDonald Spit, Seldovia, Bear Creek, Ninichik, Anchor Point, Funny River, Soldotna, Kenai, Nikiski, Girdwood, Anchorage, Eagle River.
No damage or casualties or tsunami was reported with this earthquake. The
last earthquake of M>=5.4 in the Kenai Peninsula, Alaska within abouot 200 km
of today's epicenter was an M 5.4 on March 19, 2023 with the last of larger magnitude
and M 5.8 more than six years ago on May 27, 2019.
...
The last earthquake of larger magnitude within about 200 km of today's event
occurred about 50 km south of today's epicenter on January 24, 2016 with M 7.1 and
prior to that an M 6.2 on July 29, 2015. Both of these events were associated
with strong solar outbursts. Today's earthquake occurred within minutes of
local solar noon (like the M 7.2 in Northern California yesterday) and
was likely promoted by strong tidal and geomagnetic stresses which maximize
near this hour." (December 21, 2021, March 19, 2023)
Today's event appears to have been triggered by a strong geomagnetic storm
at high latitudes. High latitude k-index reached 7 at the time of the earthquake
in Alaska. This is the greatest geomagnetic disturbance at high latitudes
since October 1, 2025 (nearly a month ago) when K also reached 7.
This epicenter was probably also promoted by energy associated with Hurricane
Melissa. It is located at 60.0 degrees from the position of the eye of
Melissa at the time of the earthquake. This is similar to the circumstances
associated with the M 5.4 in Central Iceland reported in the previous issue
of this summary:
"This epicenter in Iceland is at 60.0 degrees (node 6) from the landfall position
of Hurricane Melissa of October 29 and occurred as that landfall was occurring.
It was probably promoted by that exchange of energy." (October 30, 2025, November 27, 2025)
This epicenter was near the sixth node (60 degrees) from the current eye and landfall of
Typhoon Dolphin and Chiapas, Mexico and may have been promoted by energy
from those sources.
O: 08AUG2026 04:50:34 62.3N 152.3W MW=5.6 NEIC CENTRAL ALASKA
O: 08AUG2026 04:50:33 62.3N 152.3W MW=5.2 EMSC CENTRAL ALASKA
O: 08AUG2026 04:56:35 62.2N 152.2W ML=3.2 EMSC CENTRAL ALASKA
O: 08AUG2026 07:01:48 62.2N 152.4W ML=3.4 EMSC CENTRAL ALASKA
A geomagnetic pulse excursion was observed on the GOES-18 magnetometer at 137 W longitude
today starting at 17:56 UT on August 7, 2026. An arcjet correction to the satellite orbit
returned GOES-18 to its expected orbit and normal operations resumed by
09:10 UT. Earthquakes of M 3.3 in Salta, Argentina; M 3.8 in Bhutan and M 3.0 in
Antofagasta Chile accompanied this geomagnetic excursion. The events in South
America were near local solar noon at the time.
O: 07AUG2026 17:56:09 24.0S 67.1W ML=3.3 EMSC SALTA, ARGENTINA
O: 07AUG2026 17:57:57 27.6N 89.9E ML=3.8 EMSC BHUTAN
O: 07AUG2026 17:58:58 21.3S 71.6W ML=3.0 EMSC ANTOFAGASTA, CHILE
A moderate geomagnetic storm appears to have begun around 10:00 on August 8, 2026.
Peak Hp30 (GFZ) index reached 6 around 12:15 UT with this storm.
A moderately strong earthquake of M 5.6 in the area Southeast of Easter
Island occurred at the beginning of this storm and may have been
promoted by energy associated with it.
O: 08AUG2026 11:41:27 41.5S 90.1W ML=5.6 EMSC SOUTHEAST OF EASTER ISLAND
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026. The strongest events
in the area today were three closely spaced events of M 4.3 each.
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 07AUG2026 10:21:06 14.0N 93.1W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 07AUG2026 20:32:57 14.0N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 07AUG2026 20:47:16 14.1N 93.5W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 07AUG2026 20:10:11 14.2N 93.6W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 07AUG2026 22:19:58 14.2N 93.2W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 07AUG2026 20:42:12 14.4N 92.9W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 08AUG2026 01:19:52 14.5N 92.7W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
NEIC reported an earthquake of M 4.7 in Central Peru was felt with intensity up to II-III in the area(s) of Central Peru in Chupaca, Junin.
EMSC reported moderate shaking in Peru at Huancayo and Vilacoto.
O: 07AUG2026 23:11:23 12.1S 75.5W MB=4.7 EMSC CENTRAL PERU
NEIC reported an earthquake of M 3.3 in Central California was felt with intensity up to II-III in the area(s) of Central California in Paicines.
O: 07AUG2026 15:46:44 36.6N 121.2W ML=3.1 EMSC CENTRAL CALIFORNIA
O: 07AUG2026 14:27:56 36.5N 121.2W ML=3.0 EMSC CENTRAL CALIFORNIA
O: 07AUG2026 14:27:56 36.5N 121.2W ML=3.3 NEIC CENTRAL CALIFORNIA
O: 07AUG2026 09:35:30 36.6N 121.2W MD=2.2 EMSC CENTRAL CALIFORNIA
O: 07AUG2026 09:40:34 36.6N 121.2W MD=2.7 EMSC CENTRAL CALIFORNIA
O: 07AUG2026 15:16:51 36.6N 121.2W MD=2.8 EMSC CENTRAL CALIFORNIA
NEIC reported an earthquake of M 4.1 in Southeastern Alaska was felt with intensity up to II-III in the area(s) of Southeastern Alaska near Hydaburg.
O: 07AUG2026 11:48:05 53.4N 133.4W MB=4.1 EMSC HAIDA GWAII REGION
EMSC reported an earthquake of M 2.3 in Portugal was felt with intensity up to IV in the area(s) of Portugal with a noise an Monchique.
O: 08AUG2026 07:05:36 37.4N 8.5W ML=2.3 EMSC PORTUGAL
EMSC reported an earthquake of M 4.2 in Tarapaca, Chile was felt with intensity up to IV in the area(s) of Tarapaca, Chile in Arica.
O: 07AUG2026 15:42:24 18.9S 69.7W ML=4.2 EMSC TARAPACA, CHILE
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM CHAN-HOM DEPRESSION 14W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS CHAN-HOM 2026-08-08 00:00 UT 33.0N 154.9E 45 kts North Pacific
TS Chan-Hom (TD 14W) continued today in the Northern Pacific with winds up to 45 kts. It will track towards Honshu, Japan over the next several days reaching Honshu, Japan about August 11 and making landfall north of Tokyo. While no seismicity is expected at this time, it is likely to trigger a moderate to strong earthquake near its time of landfall in Honshu, Japan. The antipode is at 33S 26W in the South Atlantic - not a seismic area.
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP DOLPHIN 2026-08-08 00:00 UT 26.9N 125.2E 90 kts Ryukyu Islands, Japan
Super-Typhoon Dolphin (TD 12W) continued today in the Ryukyu Islands, Japan with winds up to 90 kts. It will track over the Ryukyu Islands over the next day. A moderate earthquake could be triggered near landfall in that area. The antipode at 27S 55W is in the South Atlantic Ocean - an area unlikely to see seismicity at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of August 7, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
There were no C- or higher class solar flares observed by SWPC today.
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active August 9 quiet August 10 unsettled August 8. Solar M-flare chance: 10% X-class: 1% proton storm: 1%
AP Indicies: global: 4, high: 3, mid-latitude: 5, time of max k: 15:00-17:00 UT; Max k: 3 Global Kp 1.67 1500-1700, August 7; Sunspot Number: 72; Radio Flux: 97
The Hp30 index (GFZ) did not exceed 3 today. No geomagnetic storms were observed.
A geomagnetic pulse excursion was observed on the GOES-18 magnetometer at 137 W longitude
today starting at 17:56 UT on August 7, 2026. An arcjet correction to the satellite orbit
returned GOES-18 to its expected orbit and normal operations resumed by
09:10 UT. Earthquakes of M 3.3 in Salta, Argentina; M 3.8 in Bhutan and M 3.0 in
Antofagasta Chile accompanied this geomagnetic excursion. The events in South
America were near local solar noon at the time.
O: 07AUG2026 17:56:09 24.0S 67.1W ML=3.3 EMSC SALTA, ARGENTINA
O: 07AUG2026 17:57:57 27.6N 89.9E ML=3.8 EMSC BHUTAN
O: 07AUG2026 17:58:58 21.3S 71.6W ML=3.0 EMSC ANTOFAGASTA, CHILE
A moderate geomagnetic storm appears to have begun around 10:00 on August 8, 2026.
Peak Hp30 (GFZ) index reached 6 around 12:15 UT with this storm.
A moderately strong earthquake of M 5.6 in the area Southeast of Easter
Island occurred at the beginning of this storm and may have been
promoted by energy associated with it.
O: 08AUG2026 11:41:27 41.5S 90.1W ML=5.6 EMSC SOUTHEAST OF EASTER ISLAND
August 7, 2026
Notable earthquakes and events:
The strongest earthquake in the U.S. or Canada today was an M 4.9 off the coast of Oregon near Port Orford.
NEIC reported that it was felt with intensity II in Coos Bay, Oregon and in California at Crescent City and Kneeland. It occurred near local solar midnight, The last earthquake of M>=4.9
off the Oregon coast within about 100 km of this epicenter occurred on
June 3, 2026 with M 5.7. This date should ring a bell with frequent
readers of this summary as it coincides with the last major geomagnetic
storm as noted in the previous issue of this summary. At the time this summary noted:
"The strongest associated earthquake with the X-class flare was an M 5.7 off
the coast of northern California. The last earthquake of M>=5.7 within
about 200 km of this epicenter was an M 5.8 on September 9, 2025. At the
time this summary noted:
"A moderately strong M 5.8 earthquake occurred today off the coast of Oregon (US). NEIC reported maximum intensity III in Walnut Grove, British Columbia, Canada and Coos Bay, Oregon with lesser shaking in San Francisoc, California and in British Columbia at Victoria and Parksville.
An aftershock of M 4.9 was also felt lightly along the coast of Oregon and as far
as British Columbia. When an M 4.8 hit off Vancouver Island yesterday this summary
noted:
"The strongest earthquake in the U.S. or Canada today was an M 4.8 in the Queen Charlotte and Vancouver Island ares of British Columbia, Canada.
An aftershock of M 4.0 was also reported felt lightly in Vancouver and Victoria, British Columbia, Canada.
This epicenter is at the tenth node (36 degrees) from the current eye of
Hurricane Kiko and may have been promoted by energy from that source.
The last earthquake of M>=4.8 in the Queen Charlotte Islands region within about
200 km of today's epicenter occurred on February 25, 2025 with M 5.3. At the
time this summary noted:
"This earthquake of M 5.3 is the strongest in the Vancouver Island of British
Columbia since an M 6.5 on September 15, 2024 and an M 5.6 on September 17, 2023." (February 25, 2025)
As with many of the stronger events in the Queen Charlotte Islands, today's earthquake
occurred while a strong meteorological storm was occurring in the northeastern U.S." (September 8, 2025)
The M 5.8 is the strongest earthquake in this area off the coast of Oregon within about 150 km of this epicenter since an M 5.9 on June 4, 2021.
At the time this summary noted:
"Today's activity of M 5.9 occurred within about half an hour of local solar
midnight with a strong aftershock near local solar noon of M 4.7. Tidal
stresses maximize near these hours and these were probably enhanced by
those stresses. The last earthquake of M>=5.9 within about 200 km of
today's epicenters occurred on September 5, 2019 with M 5.9 following an
M 6.4 on August 29, 2019. These events were about 200 km northwest of
today's activity. The last such event within about 150 km of today's
epicenter were an M 7.1 on June 15, 2005 and an M 6.2 on July 24, 1996.
When the M 6.4 occurred on August 29, 2019 this summary noted in this regard:
"This is the strongest earthquake off the coast of Oregon within about 250
km of this epicenter in more than 10 years - since an M 6.3 on January 10, 2008
and prior to that an M 6.3 on January 16, 2003. The only event in the region
with greater magnitude in the past 30 years was an M 6.9 on July 13, 1991." (September 5, 2019, June 4, 2021, September 9, 2025, June 3, 2026)
Today's earthquake off Oregon was located at the sixth node (60 degrees) from Venezuela and
at the fifth node (72 degrees), the ninth node (40 degrees) from Chiapas, from Kyushu and 105 degrees from Venezuela
and may have been promoted by energy from those sources.
O: 06AUG2026 09:55:40 42.4N 126.0W MB=4.9 EMSC OFF THE COAST OF OREGON
A strong excursion of the geomagnetic field strength was recorded today on the GOES-19
magnetometer at 72 West longitude. This began about 01:50 UT. An arcjet maneuver
repositioned the satellite and normal operations resumbed by 03:20 UT at that satellite. The strongest earthquake associated with this
geomagnetic pulse occurred as an M 5.0 in Mindoro, Philippines at 02:38 UT near
local solar noon. An M 4.2 in Chiapas, Mexico occurred near the beginning of this
geomagnetic excursion. The earthquake in Mindoro, Philippines may also have
been triggered by landfall of Tropical Storm Fujira just to the north of
this epicenter which repeated about the time of this earthquake. NEIC reported
this earthquake was felt is Southern Tagalog, Philippines with intensity IV
in Lipa, Tagaytay, Taytay, and III in Candelaria, San Juan, Santa Clara, San Pablo, Kinalaglagan, Pinugay, Balagtasin, and II in Bansud, Dasmarinas, Entablado, Mariveles, Niogan.
EMSC reported moderate and long shaking in the Philippines at Calumpang, Matingain, Tagaytay, Patuto, Balele, Lumangbayan, General Trias, Isabang, Lucena, Masiga, Laylay, Muntinlupa, Pasay, Taguig, Pateros, Makati City, Port Area, Quiapo, Bulacan, Olongapo, Bulalacao.
This epicenter is at the fifth node (72 degrees) from New Zealand and may
have been promoted by energy from that source.
O: 07AUG2026 02:38:09 13.3N 120.6E MB=5.0 EMSC MINDORO, PHILIPPINES
The strongest earthquake in the world today was an M 5.4 off the east coast of Honshu, Japan. It may have been felt with intensity III in the area of Yamada, Japan.
This event was probably triggered by stresses associated with the landfall of
Typhoon Dolphin to the south of this at the time this earthquake occurred.
This had been anticipated in this and earlier issues of this summary as:
"Super-Typhoon Dolphin (TD 12W) continued today in the north-central Pacific with winds up to 135 kts. It is expected to reach the Bonin Islands, Japan today and may help trigger moderate regional seismicity near landfall. It will then track towards southern Honshu and the Ryukyu Islands reaching that area with winds up to 125 kts. A moderate earthquake could be triggered near landfall in that area." (August 3-6, 2026)
This epicenter is at 104 degrees from Chiapas, Mexico and may have been
promoted by energy from that source.
O: 06AUG2026 17:43:36 39.6N 143.6E MW=5.4 EMSC OFF EAST COAST OF HONSHU,
O: 06AUG2026 17:50:40 39.6N 143.7E mb=4.6 EMSC OFF EAST COAST OF HONSHU,
The strongest felt earthquake in the world today was an M 5.3 in Central Peru. NEIC reported it was felt with intensity VI in Junin, Peru at Huayucachi and IV in Huancayo and II in Lima.
EMSC reported moderate shaking in Peru at Oxapampa, San Luis, and Santiago de Surco, Lima.
This epicenter is located at 143 degrees from Kyushu, Japan and may have
been promoted by energy from that source.
O: 06AUG2026 18:57:22 12.1S 75.3W MW=5.3 EMSC CENTRAL PERU
Aftershocks continued today in Mindanao, Philippines following an M 6.3 on the
UT morning of August 5, 2026. The strongest aftershocks since the previous
issue of this summary was an M 4.0. NEIC reported it was felt with intensity V
in Southern Mindanao, Philippines in Glan and IV in Maan, Malbang, Katangawan and III in Buayan and Padada.
This activity is located at the 12th node from Kyushu, Japan (30 degrees) and
may have been promoted by energy from that source.
O: 07AUG2026 06:22:59 4.6N 126.4E ML=4.0 EMSC KEPULAUAN TALAUD, INDONESIA
The most unusual earthquake of the day was an M 4.2 in the South Indian
Ocean east of Madagascar. It was not reported felt. This event may have
been triggered by antipodal energy concentration from Hurricane Genevieve
which passed over the antipode of this earthquake in the Indian Ocean on August
1, 2026, four days ago. At the time this summary noted this possibility as:
"Hurricane Genevieve's ... antipode at 22S 54E is near the South Indian Ridge system - a seismic area in the South Indian Ocean where some enhanced seismicity may occur antipodally to Genevieve at this time." (August 1, 2026)
The last earthquake within about 200 km of this epicenter with M>=4.2 occurred on September 18, 2024 with
M 5.2 - the only such event in the area in the past 35 years. At the time
this summary noted it as:
"The most unusual earthquake in the world today was an M 5.2 off southern Madagascar. NEIC reported it was felt with intensity IV in Madagascar at Taolanaro, Toliary.
Moderate but solid shaking with a significant noise was reported by EMSC in Madagascar at Fort-Dauphin.
This is the strongest earthquake south of Madagascar within about 500 km of today's
epicenter since an M 5.3 on January 25, 2013 that occurred about 500 km northeast of today's
epicenter. At the time this summary noted:
"The earthquake in Madagascar is highly unusual. It is the strongest to hit
that region in at least 23 years. The only other moderate event within 300 km
of this epicenter in the past 25 years was an M 5.0 on November 14, 1992
north of today's epicenter. A strong change in the geomagnetic field strength
began between 2100 UT and 2200 UT when Madagascar was directly anti-solar
(local solar midnight). This was apparently triggered by an equally strong
change in the electron flux in the solar wind which dropped at the same
time and was at its maximum state of change when the Madagascar event
occurred. The antipode of Madagascar is east of Hawaii in the central
Pacific Ocean but seismicity in Hawaii may also be affected by this geomagnetic
change. The change in the geomagnetic field led to a short geomagnetic
storm beginning about 0000 UT on January 26. The earthquake in Madagascar
was reported felt with intensity V in Toliary, Madagascar." (January 25, 2013)
Today's earthquake in Madagascar occurred within about an hour of the full moon
and eclipse today and was probably promoted by strong tidal stresses with
this alignment. It also coincided with a strong geomagnetic storm which reached
the strongest AP level (71) today since an AP of 273 was recorded on May 11, 2024,
another factor which helped trigger the Madagascar quake at this time." (September 18, 2024)
This epicenter is located at 102 degrees from Kyushu and 144 degrees from
Chiapas, Mexico and may have been promoted by energy from those sources.
O: 05AUG2026 08:52:22 23.8S 49.8E ML=4.2 EMSC SOUTH INDIAN OCEAN
Moderate aftershocks continued today in the region of Kyushu, Japan.
Tolls continued to rise as rescue teams combed the area and sifted through
debris of collapsed structures and a mall. Those dead now exceed 32 but this is
expected to rise. The strongest aftershock today was an M 4.6. NEIC reported
it was felt with intensity IV in Kunitomi, Miyazaki and in Kumamoto at Koshi and Kumamoto and in Fukuoka, Japan.
Typhoon Dolphin will pass south of this area today and tomorrow. It could
help promote stronger aftershock activity in Kyushu near the time of landfall.
O: 06AUG2026 10:49:24 32.7N 130.8E MB=4.6 EMSC KYUSHU, JAPAN
O: 06AUG2026 07:18:30 32.6N 130.6E ML=4.0 EMSC KYUSHU, JAPAN
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026. The strongest event
in the area today was an M 4.2. This occurred at the start of a strong
geomagnetic excursion recorded on the GOES-18 magnetometer beginning near
01:40 UT (see below). This area is now north of sub-solar latitude
on this, the mid-way day through summer (which is at 12 North latitude today).
Areas at sub-solar latitudes today include Nicaragua, Ethiopia, areas of the
Central Mid-Atlantic, and northern Mindanao, Philippines where volcanism and seismicity
may be enhanced at this time.
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 07AUG2026 01:36:56 15.7N 93.9W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 06AUG2026 12:02:30 13.8N 92.4W ML=4.0 EMSC OFFSHORE GUATEMALA
O: 06AUG2026 21:31:45 14.1N 93.2W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 07AUG2026 04:26:52 14.2N 93.6W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 06AUG2026 22:41:17 14.7N 93.0W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 06AUG2026 10:30:43 14.9N 93.2W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 06AUG2026 23:33:43 15.3N 93.1W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
NEIC reported an earthquake of M 4.5 in Mendoza, Argentina was felt with intensity up to II-III in the area(s) of Mendoza, Argentina.
EMSC reported moderate shaking in Argentina at Maipu, Gody Cruz, Mendoza, Villa Nueva, Las Heras, and Santiago.
This epicenter is at the seventh node (52 degrees) from Chiapas, Mexico and may have been promoted by energy from that source.
O: 07AUG2026 00:00:40 33.1S 68.9W MB=4.5 EMSC MENDOZA, ARGENTINA
NEIC reported an earthquake of M 3.9 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaska in Homer and Clam Gulch.
O: 06AUG2026 09:38:57 59.7N 153.2W ML=3.9 EMSC SOUTHERN ALASKA
EMSC reported an earthquake of M 4.4 in the Dodecanese Islands was felt with intensity up to II-III in the area(s) of the Dodecanese Islands in Greece at Lindos, Lardos, Ialysos.
O: 07AUG2026 07:10:57 36.0N 28.0E ML=4.4 EMSC DODECANESE IS.-TURKEY
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM KUJIRA (DEPRESSION 13W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS KUJIRA 2026-08-07 00:00 UT 16.7N 122.9E 35 kts Northern Philippines
TS Kujira continued today and made landfall in the northern Philippines with winds up to 35 kts. It is expected to move to the west and to dissipate around August 7. Moderate earthquakes could be triggered in the Philippines with these landfall events. The antipode at 17S 58W is in eastern Bolivia and Brazil where a regional forced shock is unlikely at this time.
TROPICAL STORM CHAN-HOM DEPRESSION 14W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS CHAN-HOM 2026-08-07 00:00 UT 29.7N 160.4E 50 kts North Pacific
TS Chan-Hom (TD 14W) formed today in the Northern Pacific with winds up to 50 kts. It will track towards Honshu, Japan over the next several days reaching Honshu, Japan about August 11 and making landfall north of Tokyo. While no seismicity is expected at this time, it is likely to trigger a moderate to strong earthquake near its time of landfall in Honshu, Japan. The antipode is at 30S 20W in the Atlantic - not a seismic area.
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP DOLPHIN 2026-08-07 00:00 UT 26.7N 128.1E 110 kts Ryukyu Islands, Japan
Super-Typhoon Dolphin (TD 12W) continued today in the Ryukyu Islands, Japan with winds up to 110 kts. It will track towards south of Honshu and into the Ryukyu Islands over the next day. A moderate earthquake could be triggered near landfall in that area. The antipode at 26S 52W is in the South Atlantic Ocean - an area unlikely to see seismicity at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of August 6, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
1360 1921 1929 1933 C1.0 (August 6, 2026) 5.0E-04
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active August 7 and 9 unsettled August 8. Solar M-flare chance: 10% X-class: 1% proton storm: 1%
AP Indicies: global: 3, high: 1, mid-latitude: 5, time of max k: 00:00-06:00 UT; Max k: 1 Global Kp 1.33 0000-0600, August 6; Sunspot Number: 71; Radio Flux: 101
The Hp30 index (GFZ) did not exceed 1.33 today. No geomagnetic storms were observed.
A strong excursion of the geomagnetic field strength was recorded today on the GOES-19
magnetometer at 72 West longitude. This began about 01:50 UT. An arcjet maneuver
repositioned the satellite and normal operations resumbed by 03:20 UT at that satellite. The strongest earthquake associated with this
geomagnetic pulse occurred as an M 5.0 in Mindoro, Philippines at 02:38 UT near
local solar noon. An M 4.2 in Chiapas, Mexico occurred near the beginning of this
geomagnetic excursion.
August 6, 2026
Notable earthquakes and events:
Most triggering agents were at moderate or low intensity today. This was
reflected in a relatively quiet 24 hours of global seismicity. The strongest
earthquakes - of M 6.3 in Sulawesi, Indonesia and in Mindanao, Philippines
appear to have been promoted by landfall of Tropical Storm Fujira in the
Philippines at the time of their occurrence.
The strongest earthquake in the U.S. or Canada today was an M 4.9 off the coast of Oregon near Port Orford.
NEIC did not report that it was felt. The last earthquake of M>=4.9
off the Oregon coast within about 100 km of this epicenter occurred on
June 3, 2026 with M 5.7. This date should ring a bell with frequent
readers of this summary as it coincides with the last major geomagnetic
storm as noted in the previous issue of this summary. At the time this summary noted:
"The strongest associated earthquake with the X-class flare was an M 5.7 off
the coast of northern California. The last earthquake of M>=5.7 within
about 200 km of this epicenter was an M 5.8 on September 9, 2025. At the
time this summary noted:
"A moderately strong M 5.8 earthquake occurred today off the coast of Oregon (US). NEIC reported maximum intensity III in Walnut Grove, British Columbia, Canada and Coos Bay, Oregon with lesser shaking in San Francisoc, California and in British Columbia at Victoria and Parksville.
An aftershock of M 4.9 was also felt lightly along the coast of Oregon and as far
as British Columbia. When an M 4.8 hit off Vancouver Island yesterday this summary
noted:
"The strongest earthquake in the U.S. or Canada today was an M 4.8 in the Queen Charlotte and Vancouver Island ares of British Columbia, Canada.
An aftershock of M 4.0 was also reported felt lightly in Vancouver and Victoria, British Columbia, Canada.
This epicenter is at the tenth node (36 degrees) from the current eye of
Hurricane Kiko and may have been promoted by energy from that source.
The last earthquake of M>=4.8 in the Queen Charlotte Islands region within about
200 km of today's epicenter occurred on February 25, 2025 with M 5.3. At the
time this summary noted:
"This earthquake of M 5.3 is the strongest in the Vancouver Island of British
Columbia since an M 6.5 on September 15, 2024 and an M 5.6 on September 17, 2023." (February 25, 2025)
As with many of the stronger events in the Queen Charlotte Islands, today's earthquake
occurred while a strong meteorological storm was occurring in the northeastern U.S." (September 8, 2025)
The M 5.8 is the strongest earthquake in this area off the coast of Oregon within about 150 km of this epicenter since an M 5.9 on June 4, 2021.
At the time this summary noted:
"Today's activity of M 5.9 occurred within about half an hour of local solar
midnight with a strong aftershock near local solar noon of M 4.7. Tidal
stresses maximize near these hours and these were probably enhanced by
those stresses. The last earthquake of M>=5.9 within about 200 km of
today's epicenters occurred on September 5, 2019 with M 5.9 following an
M 6.4 on August 29, 2019. These events were about 200 km northwest of
today's activity. The last such event within about 150 km of today's
epicenter were an M 7.1 on June 15, 2005 and an M 6.2 on July 24, 1996.
When the M 6.4 occurred on August 29, 2019 this summary noted in this regard:
"This is the strongest earthquake off the coast of Oregon within about 250
km of this epicenter in more than 10 years - since an M 6.3 on January 10, 2008
and prior to that an M 6.3 on January 16, 2003. The only event in the region
with greater magnitude in the past 30 years was an M 6.9 on July 13, 1991." (September 5, 2019, June 4, 2021, September 9, 2025, June 3, 2026)
O: 06AUG2026 09:55:40 42.4N 126.0W MB=4.9 EMSC OFF THE COAST OF OREGON
Aftershocks continued today in Mindanao, Philippines following an M 6.3 on the
UT morning of August 5, 2026. The strongest aftershocks since the previous
issue of this summary was an M 5.6. NEIC reported it was felt with intensity V
in Southern Mindanao, Philippines in Glan and IV in Maan, Malbang, Katangawan and III in Buayan and Padada.
This activity is located at the 12th node from Kyushu, Japan (30 degrees) and
may have been promoted by energy from that source.
O: 05AUG2026 09:17:08 5.1N 125.2E MB=4.8 EMSC MINDANAO, PHILIPPINES
O: 05AUG2026 22:11:44 5.1N 125.2E mb=4.9 EMSC MINDANAO, PHILIPPINES
O: 05AUG2026 14:22:49 5.2N 125.5E ML=4.0 EMSC MINDANAO, PHILIPPINES
O: 05AUG2026 17:05:13 5.2N 125.6E ML=4.3 EMSC MINDANAO, PHILIPPINES
O: 05AUG2026 21:41:29 5.2N 125.3E Mw=5.6 EMSC MINDANAO, PHILIPPINES
O: 06AUG2026 03:12:09 5.2N 125.6E ML=4.1 EMSC MINDANAO, PHILIPPINES
O: 05AUG2026 16:30:56 5.3N 125.6E ML=4.3 EMSC MINDANAO, PHILIPPINES
O: 05AUG2026 04:14:06 5.2N 125.3E MB=6.3 EMSC MINDANAO, PHILIPPINES
An earthquake of M 6.3 struck several hours after the M 6.3 Mindanao event in the area of southern
Kermadec Islands, New Zealand. NEIC reported this earthquake was felt with intensity III in Gisborne, New Zealand at Patutahi and Gisborne and II in the Bay of Plenty at Whakatane, Taneatua, in Hawke's Bay at Napier, Hastings, and in Wellington, Palmerston North, and Lower Hutt.
The last earthquake with M>=6/3 within about 200 km of this epicenter in southern Kermadec Islands
was an M 6.6 on September 8, 2023. At the time this summary noted:
"The M 6.6 in the Kermadec Islands, New Zealand today was widely felt in North Island, New
Zealand - unlike most strong earthquakes in the Kermadec Islands. NEIC reported
maximum intensity for the M 6.6 at IV in Gisborne at Te Karaka and II-III in the Bay of Plenty at Opotiki, Whakatane, in North Shore, Auckland, Napier, Hawke's Bay, in Manawatu-Wanganui at Palmerston North and Shannon, and more than 1000 km away in Wellington at Porirua, Lower Hutt and Wellington.
This is the strongest earthquake in the Kermadec Islands within about 200
km of this epicenter since an M 6.6 on August 14, 2022 and an M 7.4 on June 18, 2020." (September 8, 2023)
This earthquake occurred at the end of the strongest solar flare in the past three
days - a C1.6 and may have have been promoted by SFE associated with that flare.
Preliminary data on this flare from SWPC follow.
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0556 0622 0745 C1.6 (August 5, 2026) 4.8E-03 *
Mindanao M 4.9, 5.1 05:57, 05:59 UT M 4.6 06:41 UT
Guatemala M 4.3 06:13 UT
Chiapas M 4.2 06:41 UT
Auckland New Zealand M 5.2 06:44 UT
Costa Rica M 4.0 06:53 UT
Kermadec Is. M 6.3 07:43 UT
On July 31, 2026 this summary noted the relation of events in the Kermadec
Islands to Kyushu as:
"Activity following strong events in Kyushu, Japan tends to concentrate in Papua and in New Britain and New
Ireland in the several days after - as well as in the Kermadec Islands
and the Antarctic-Pacific Ridge and these areas are likely to continued
to see elevated seismicity at this time." (July 31, 2026)
This epicenter in the Kermadec Islands is at the fifth node (72 degrees)
from the current eye of Typhoon Dolphin and may have been promoted by
energy from that source.
O: 05AUG2026 07:43:27 33.8S 179.4E MB=6.3 EMSC SOUTH OF KERMADEC ISLANDS
An earthquake of M 5.7 also occurred today in the Molucca Sea, Indonesia south of Mindanao.
NEIC reported it was felt with intensity IV in Sulawesi at Bitung and II in Manado, Indonesia.
An aftershock near local solar midnight of M 5.3 was also felt lightly in Manado, Sulawesi.
This is an aftershock of the M 7.4 that hit this epicenter on April 1, 2026.
The last aftershock of that event of M>=5.7 occurred as an M 5.9 on May 22, 2026 - the
only such aftershock since early April, 2026.
Like the subsequent earthquake of M 6.3 north of this in Mindanao, Philippines
this event may have been promoted by landfall in the Philippines today of
Tropical Storm Kujira (see above).
This epicenter is at the 13th node (27 degrees) from Typhoon Dolphin and at
the 11th node (33 degrees) from Kyushu and the sixth node (60 degrees) from New Zealand and may have been promted by energy from those sources.
O: 04AUG2026 20:16:37 1.5N 126.5E MB=5.7 EMSC MOLUCCA SEA, INDONESIA
O: 05AUG2026 14:43:41 1.3N 126.4E MB=4.7 EMSC MOLUCCA SEA
O: 05AUG2026 14:16:53 1.4N 126.3E mb=4.7 EMSC MOLUCCA SEA
O: 05AUG2026 16:50:18 1.8N 127.4E MW=5.3 EMSC HALMAHERA, INDONESIA
The most unusual earthquake of the day was an M 4.2 in the South Indian
Ocean east of Madagascar. It was not reported felt. This event may have
been triggered by antipodal energy concentration from Hurricane Genevieve
which passed over the antipode of this earthquake in the Indian Ocean on August
1, 2026, four days ago. At the time this summary noted this possibility as:
"HURR GENEVIEVE 2026-08-01 00:00 UT 22.4N 131.4W 60 kts West of Mexico
Hurricane Genevieve continued today West of Mexico with winds up to 60 kts. It is expected to track to the west but is unlikely to significantly affect regional seismicity at this time. The antipode is at 23S 50E" (August 1, 2026) and is not a seismic area."
and
"HURR GENEVIEVE 2026-08-02 00:00 UT 23.7N 136.4W 55 kts North Pacific
Hurricane Genevieve continued today in the north Pacific with winds up to 55 kts. It is expected to track to the west but is unlikely to significantly affect regional seismicity at this time and to dissipate in the North Pacific around August 5. The antipode at 24S 44E is not a seismic zone." (August 2, 2026)
The last earthquake within about 200 km of this epicenter with M>=4.2 occurred on September 18, 2024 with
M 5.2 - the only such event in the area in the past 35 years. At the time
this summary noted it as:
"The most unusual earthquake in the world today was an M 5.2 off southern Madagascar. NEIC reported it was felt with intensity IV in Madagascar at Taolanaro, Toliary.
Moderate but solid shaking with a significant noise was reported by EMSC in Madagascar at Fort-Dauphin.
This is the strongest earthquake south of Madagascar within about 500 km of today's
epicenter since an M 5.3 on January 25, 2013 that occurred about 500 km northeast of today's
epicenter. At the time this summary noted:
"The earthquake in Madagascar is highly unusual. It is the strongest to hit
that region in at least 23 years. The only other moderate event within 300 km
of this epicenter in the past 25 years was an M 5.0 on November 14, 1992
north of today's epicenter. A strong change in the geomagnetic field strength
began between 2100 UT and 2200 UT when Madagascar was directly anti-solar
(local solar midnight). This was apparently triggered by an equally strong
change in the electron flux in the solar wind which dropped at the same
time and was at its maximum state of change when the Madagascar event
occurred. The antipode of Madagascar is east of Hawaii in the central
Pacific Ocean but seismicity in Hawaii may also be affected by this geomagnetic
change. The change in the geomagnetic field led to a short geomagnetic
storm beginning about 0000 UT on January 26. The earthquake in Madagascar
was reported felt with intensity V in Toliary, Madagascar." (January 25, 2013)
Today's earthquake in Madagascar occurred within about an hour of the full moon
and eclipse today and was probably promoted by strong tidal stresses with
this alignment. It also coincided with a strong geomagnetic storm which reached
the strongest AP level (71) today since an AP of 273 was recorded on May 11, 2024,
another factor which helped trigger the Madagascar quake at this time." (September 18, 2024)
This epicenter is located at 102 degrees from Kyushu and 144 degrees from
Chiapas, Mexico and may have been promoted by energy from those sources.
O: 05AUG2026 08:52:22 23.8S 49.8E ML=4.2 EMSC SOUTH INDIAN OCEAN
Moderate aftershocks continued today in the region of Kyushu, Japan.
Tolls continued to rise as rescue teams combed the area and sifted through
debris of collapsed structures and a mall. Those dead now exceed 32 but this is
expected to rise. The strongest aftershock today was an M 4.9. NEIC reported
it was felt with intensity IV in Kunitomi, Miyazaki and in Kumamoto at Koshi and Kumamoto and in Fukuoka, Japan.
O: 05AUG2026 22:59:25 32.4N 130.6E MW=4.9 EMSC KYUSHU, JAPAN
O: 06AUG2026 07:18:30 32.6N 130.6E ML=4.0 EMSC KYUSHU, JAPAN
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026. The strongest event
in the area today was an M 4.2. This area is now north of sub-solar latitude
on this, the mid-way day through summer (which is at 12 North latitude today).
Areas at sub-solar latitudes today include Nicaragua, Ethiopia, areas of the
Central Mid-Atlantic, and northern Mindanao, Philippines where volcanism and seismicity
may be enhanced at this time.
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 05AUG2026 23:14:46 13.7N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 05AUG2026 21:14:59 13.8N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
NEIC reported an earthquake of M 4.5 in Northern California was widely felt throughout most of northern California.
NEIC reported intensity III was felt in Northern California in Blocksburg, Redway, Alderpoint, Scotia, Myers Flat, Leggett, Redcrest, Covelo, Garberville and Rio Dell.
An M 3.9 foreshock one m inute prior to the M 4.5 was reported by NEIC to have
been felts with IV in California at Laytonville and II-III in Alderpoint, Blocksvurg, Eureka, Garberville, Petrolia.
An M 4.0 foreshock yesterday was felt with intensity up to II-III in the area(s) of Northern California with V in Alderpoint; III in Laytonville, Whitethorn, Eureka, Leggett and II in Garberville, Fort Bragg, Willits, Westport, Cottonwood, and Rio Dell.
The last earthquake in Northern California within about 100 km of this epicenter
with M>=4.5 occurred on January 1, 2023. At that time this summary noted:
"An M 5.4 aftershock of the M 6.4 in Northern California of December 20, 2022 was widely felt with additional damage today.
NEIC reported maximum intensity VII in Rio Dell with VI in Scotia, Carlotta, Redcrest, Hydesville, V in Petrolia, Ferndale and Fortuna and IV in Myers Flat and Kneeland.
It was reported felt as far as Nevada, Southern California, Washington and Oregon and
British Columbia with intensity up to IV. The quake occurred near local solar
noon and may have been promoted by SFE and/or tidal stresses which maximize near this hour. The epicenter was further inland
than the mainshock and this led to the earthquake being more strongly felt
with more damage than the mainshock. A foreshock of M 2.5 was felt in Fortuna, California.
At least 3000 lost power in today's earthquake and minor damage was reported
to some bridges and other infrastructure." (January 1, 2023)
A similar M 4.5 hit within about 50 km of today's epicenter on August 28, 2016, the
last such evne in this area. At that time it was reported in this summary as:
"A moderate earthquake of M 4.5 in northern California today was widely felt in the
region surround Hayford, California. NEIC reported this earthquake was felt with intensity IV in Hayfork and II-III in southeastern Trinity County, Bridgeville, Hyampom, Blocksburg, Zenia, Alderpoint, Burnt Ranch, Redcrest, Carlotta, Big Bar, Salyer, Myers Flat, Douglas City, Junction City, Weaverville, Garberville, Scotia, Hydesville, Rio Dell, Fortuna, Eureka, Whitethorn, Bayside, Lewiston, Aracata, French Gulch, Redding, Orland, Suisun, Alameda, Boulder Creek and Santa Cruz, California.
No damage was reported. This earthquake occurred within about an hour of local
solar noon and may have been promoted by tidal stresses which maximize at
this time. The last earthquake within about 100 km of this epicenter with M>=4.5 was
and M 4.7 on July 21, 2016 and prior to that an M 5.6 on February 13, 2012." (August 28, 2016)
This epicenter is at the 10th node from Chiapas, Mexico (36 degrees) and
at 104 degrees from New Zealand and may have been promoted by energy from those sources.
O: 05AUG2026 00:25:25 40.0N 123.4W MB=4.0 NEIC NORTHERN CALIFORNIA
O: 05AUG2026 22:21:57 40.0N 123.4W MW=4.5 EMSC NORTHERN CALIFORNIA
O: 05AUG2026 22:20:58 40.0N 123.4W Mw=3.9 EMSC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 2.6 in Missouri was felt with intensity up to II-III in the area(s) of Missouri in Caruthersville, Saint Louis, Hazelwood, Warsaw, Hornersville and possibly as far as Illinois.
This epicenter is at 103 degrees from the eye of Typhoon Dolphin at the time
of its occurrence and may have been promoted by energy from that source.
Other earthquakes near 102-103 degrees from TD Dolphin today occurred in the
Gulf of California with M 3.8, Western Texas, Nuevo Leon, and Jalisco, Mexico.
O: 04AUG2026 12:04:40 36.1N 89.8W MB=2.6 NEIC MISSOURI
NEIC reported an earthquake of M 2.7 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in Anderson.
O: 06AUG2026 02:24:11 40.4N 122.3W MD=2.7 EMSC NORTHERN CALIFORNIA
NEIC reported earthquakes of M 4.8 and M 5.0 in northern India were felt with intensity up to II-III in the area(s) of Northern India in Assam at Dibrugarh, Chabua and Dulia Gaon.
O: 05AUG2026 10:06:13 29.0N 94.7E MB=5.0 EMSC ARUNACHAL PRADESH, INDIA
O: 06AUG2026 00:15:17 29.0N 94.8E MB=4.8 EMSC EASTERN XIZANG-INDIA BORDER RE
NEIC reported an earthquake of M 5.2 in Papua New Guinea was felt with intensity up to II-III in the area(s) of Papua New Guinea in Mount Hagen, Western Highlands.
O: 05AUG2026 19:46:30 6.5S 143.9E MB=5.2 EMSC NEW GUINEA, PAPUA NEW GUINEA
NEIC reported an earthquake of M 2.7 in Southern California was felt with intensity up to II-III in the area(s) of Southern California at Ridgecrest.
O: 05AUG2026 16:46:43 35.3N 117.8W ML=2.7 EMSC SOUTHERN CALIFORNIA
O: 05AUG2026 20:07:30 35.3N 117.8W ML=2.0 EMSC SOUTHERN CALIFORNIA
O: 06AUG2026 02:21:33 35.9N 117.7W ML=2.0 EMSC CENTRAL CALIFORNIA
EMSC reported an earthquake of M 5.0 in Java was felt with intensity up to IV in the area(s) of Java in Kebontiwu, Garut, Nagara, and Wonoharjo.
O: 05AUG2026 14:55:38 8.1S 107.8E MB=5.0 EMSC JAVA, INDONESIA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM KUJIRA (DEPRESSION 13W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS KUJIRA 2026-08-06 00:00 UT 17.0N 121.7E 35 kts Northern Philippines
TS Kujira continued today and made landfall in the northern Philippines with winds up to 35 kts. It is expected to move to the west and to dissipate around August 7. Moderate earthquakes could be triggered in the Philippines with these landfall events. The antipode at 17S 58W is in eastern Bolivia and Brazil where a regional forced shock is unlikely at this time.
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP DOLPHIN 2026-08-06 00:00 UT 26.5N 133.2E 100 kts North-central Pacific west of Bonin Islands, Japan
Super-Typhoon Dolphin (TD 12W) continued today in the north-central Pacific west of Bonin Islands, Japan with winds up to 100 kts. It will track towards south of Honshu and into the Ryukyu Islands reaching that area with winds up to 100 kts. A moderate earthquake could be triggered near landfall in that area. The antipode at 26S 48W is in the South Atlantic Ocean - an area unlikely to see seismicity at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of August 5, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
1280 0556 0622 0745 C1.6 (August 5, 2026) 4.8E-03 *
Mindanao M 4.9, 5.1 05:57, 05:59 UT M 4.6 06:41 UT
Guatemala M 4.3 06:13 UT
Chiapas M 4.2 06:41 UT
Auckland New Zealand M 5.2 06:44 UT
Costa Rica M 4.0 06:53 UT
Kermadec Is. M 6.3 07:43 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: quiet August 6 active August 7 unsettled August 8. Solar M-flare chance: 15% X-class: 1% proton storm: 1%
AP Indicies: global: 3, high: 2, mid-latitude: 3, time of max k: 17:00-18:00 UT; Max k: 2 Global Kp 1.33 0600-0900, August 5; Sunspot Number: 86; Radio Flux: 108
The Hp30 index (GFZ) reached 2.66 today (around 23:30-24:00 UT August 5, 2026). No geomagnetic storms were observed.
August 5, 2026
Notable earthquakes and events:
The relative calm in strong earthquakes was broken today when an M 6.3 occurred
as an aftershock in Mindanao, Philippines.
This earthquake in the Philippines occurred as Tropical Storm Kujira was making landfall in the
area north of this epicenter in northern Philippines and may have been
promoted by stresses associated with that landfall event.
"TS KUJIRA 2026-08-05 00:00 UT 17.8N 119.0E 45 kts Northern Philippines
TS Kujira formed today and made landfall in the northern Philippines with winds up to 50 kts. It is expected to make a second landfall in the northern Philippines tomorrow after reversing direction and tracking over that area on August 5-6. Moderate earthquakes could be triggered in the Philippines with these two landfall events. The antipode at 18S 61W is in eastern Bolivia and northern Chile where a regional moderate earthquake could be triggered from antipodal energy with this storm." (August 4-5, 2026)
oday's event of M 6.3 occurred within minutes of local solar noon and may have been
The strongest aftershocks of today's M 6.3 in Mindanao, Philippines occurred
as an M 5.2 and 4.9. Today's event of M 6.3 occurred within minutes of local solar noon and may have been
promoted by the strongest solar flare in three days which also began at this
time (see below). NEIC reported it was felt with minor damage in Southern Mindanao with intensity VII in Sarangani and VI in Glan, Balangonan and Basag; V in Kiamba, Daliao, Caburan, Carpenter Hill, Katangawan, Malbang, Buayan IV in Klinan, San Jose, Badada, Davao and III in Panabo, Bato, Barra, Dapa, Zamboanga and Ula.
This is the strongest aftershock of the M 7.8 of June 7, 2026 near this same
epicenter since an M 6.5 on June 26, 2026. Like today's earthquake the mainshock
(on the geomagnetic equator) on June 7, 2026 followed a strong geomagnetic
storm as noted in the previous issues of this summary:
"A moderate (G1) geomagnetic storm occurred today and was short-lived. This storm reach high latitude
k-index about 17:00 UT of 7 and planetary K-index of 5.67 about the same time.
The Hp30 index (GFZ) reached a maximum value of 6.0 about 17:00 UT indicating
a sudden commencement storm but was elevated about 12:00 UT earlier in the day at levels near 5.
The last occurrence of a high latitude k-index of 7 occurred on July 12 and the last of planetary k-index
of 5.66 or higher was on June 5, 2026 when it reached Kp of 6.33." (August 3, 2026)
and
"This epicenter (of M 7.8 in Mindanao) lies on the geomagnetic equator near the fifth node (72 degrees)
from the South Geomagnetic pole so it might be expected that geomagnetic
effects helped trigger today's event in Mindanao. And indeed that appears
to be the case.
This earthquake occurred as the electron flux registered at GOES-18 with >=2MeV
reached its maximum for the past three weeks (since May 19, 2026) at 5.3 X 10^3 particles
per areal unit around 23:00 UT on June 7. A proton storm was also in progress
when this earthquake occurred. This proton storm began on June 6, 2026
at approximately 14:50 - 15:30 UT. The only stronger proton storm in the past
6 months occurred on May 25-26, 2006 and on April 1-3, 2026 and January 19-28, 2026 and prior to that on November 10, 2025.
Strong earthquakes accompanied the storms of November 10 (M 6.8 Northern Honshu);
May 25, 2026 (M 6.9 Antofagasta, Chile) and June 7 (M 7.8, Mindanao, Philippines) and
March 30 and April 1, 2025 (M 7.3 Vanuatu and Molucca Sea M 7.4). Four out of
five - a good match with strong earthquakes. The epicenter of the earthquake in
Mindanao was directly at local solar midnight at this time - a time when
maximum geomagnetic effects are likely. This proton storm had been noted in
the previous issue of this summary as:
"A moderate proton storm began abouot 14:50 UT as recorded on the GOES-18 Proton Flux fluxometer
with energies >=10MeV. An M 4.2 in the Andreanof Islands, Alaska occurred
the time of commencement of this storm and may have been triggered by it
at high latitudes." (June 6-7, 2026)
Proton and electron storms are effective at triggering strong earthquakes
within about a day of their commencement or at the peak of the storm.
This is consistent with the occurrence of the M 7.8 in Mindanao, Philippines
at this time." (June 8, 2026)
Readers may note that both the mainshock on June 7, 2026 and today's aftershock
on August 5, 2026 followed the last two major geomagnetic storms two days
later.
This epicenter is located at the 12th node from Kyushu, Japan (30.0 degrees)
and near the sixth node from New Zealand (60 degrees) and may have been promoted by
constructive interference of energy from those sources.
O: 05AUG2026 04:14:06 5.2N 125.3E MB=6.3 EMSC MINDANAO, PHILIPPINES
O: 05AUG2026 05:59:21 5.0N 125.4E MB=5.1 EMSC MINDANAO, PHILIPPINES
O: 05AUG2026 05:57:02 5.1N 125.8E MB=4.9 EMSC MINDANAO, PHILIPPINES
A second earthquake of M 6.3 struck several hours later in the area of southern
Kermadec Islands, New Zealand. NEIC reported this earthquake was felt with intensity III in Gisborne, New Zealand at Patutahi and Gisborne and II in the Bay of Plenty at Whakatane, Taneatua, in Hawke's Bay at Napier, Hastings, and in Wellington, Palmerston North, and Lower Hutt.
The last earthquake with M>=6/3 within about 200 km of this epicenter in southern Kermadec Islands
was an M 6.6 on September 8, 2023. At the time this summary noted:
"The M 6.6 in the Kermadec Islands, New Zealand today was widely felt in North Island, New
Zealand - unlike most strong earthquakes in the Kermadec Islands. NEIC reported
maximum intensity for the M 6.6 at IV in Gisborne at Te Karaka and II-III in the Bay of Plenty at Opotiki, Whakatane, in North Shore, Auckland, Napier, Hawke's Bay, in Manawatu-Wanganui at Palmerston North and Shannon, and more than 1000 km away in Wellington at Porirua, Lower Hutt and Wellington.
This is the strongest earthquake in the Kermadec Islands within about 200
km of this epicenter since an M 6.6 on August 14, 2022 and an M 7.4 on June 18, 2020." (September 8, 2023)
This earthquake occurred at the end of the strongest solar flare in the past three
days - a C1.6 and may have have been promoted by SFE associated with that flare.
Preliminary data on this flare from SWPC follow.
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0556 0622 0745 C1.6 (August 5, 2026) 4.8E-03 *
Mindanao M 4.9, 5.1 05:57, 05:59 UT M 4.6 06:41 UT
Guatemala M 4.3 06:13 UT
Chiapas M 4.2 06:41 UT
Auckland New Zealand M 5.2 06:44 UT
Costa Rica M 4.0 06:53 UT
Kermadec Is. M 6.3 07:43 UT
On July 31, 2026 this summary noted the relation of events in the Kermadec
Islands to Kyushu as:
"Activity following strong events in Kyushu, Japan tends to concentrate in Papua and in New Britain and New
Ireland in the several days after - as well as in the Kermadec Islands
and the Antarctic-Pacific Ridge and these areas are likely to continued
to see elevated seismicity at this time." (July 31, 2026)
This epicenter in the Kermadec Islands is at the fifth node (72 degrees)
from the current eye of Typhoon Dolphin and may have been promoted by
energy from that source.
O: 05AUG2026 07:43:27 33.8S 179.4E MB=6.3 EMSC SOUTH OF KERMADEC ISLANDS
An earthquake of M 5.7 also occurred today in the Molucca Sea, Indonesia south of Mindanao.
NEIC reported it was felt with intensity IV in Sulawesi at Bitung and II in Manado, Indonesia.
This is an aftershock of the M 7.4 that hit this epicenter on April 1, 2026.
The last aftershock of that event of M>=5.7 occurred as an M 5.9 on May 22, 2026 - the
only such aftershock since early April, 2026.
Like the subsequent earthquake of M 6.3 north of this in Mindanao, Philippines
this event may have been promoted by landfall in the Philippines today of
Tropical Storm Kujira (see above).
This epicenter is at the 13th node (27 degrees) from Typhoon Dolphin and at
the 11th node (33 degrees) from Kyushu and the sixth node (60 degrees) from New Zealand and may have been promted by energy from those sources.
O: 04AUG2026 20:16:37 1.5N 126.5E MB=5.7 EMSC SULAWESI, INDONESIA
Moderate aftershocks continued today in the region of Kyushu, Japan.
Tolls continued to rise as rescue teams combed the area and sifted through
debris of collapsed structures and a mall. Those dead now exceed 32 but this is
expected to rise. The strongest aftershock today was an M 4.8. NEIC reported
it was felt with intensity III in Miyazaki and Kagoshima, Japan.
O: 04AUG2026 19:56:58 30.2N 131.0E MB=4.8 EMSC KYUSHU, JAPAN
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026. The strongest event
in the area today was an M 4.5. This area is now north of sub-solar latitude
on this, the mid-way day through summer (which is at 12 North latitude today).
Areas at sub-solar latitudes today include Nicaragua, Ethiopia, areas of the
Central Mid-Atlantic, and northern Mindanao, Philippines where volcanism and seismicity
may be enhanced at this time.
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 04AUG2026 07:07:08 14.3N 93.4W MB=4.6 NEIC CHIAPAS, MEXICO
NEIC reported an earthquake of M 3.2 in Nevada was felt with intensity up to II-III in the area(s) of Nevada in Glenbrook.
O: 05AUG2026 01:36:00 39.2N 119.0W MB=3.2 NEIC NEVADA
NEIC reported an earthquake of M 4.0 in Northern California was felt with intensity up to II-III in the area(s) of Northern California with V in Alderpoint; III in Laytonville, Whitethorn, Eureka, Leggett and II in Garberville, Fort Bragg, Willits, Westport, Cottonwood, and Rio Dell.
O: 05AUG2026 00:25:25 40.0N 123.4W MB=4.0 NEIC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 2.6 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in Cloverdale.
O: 04AUG2026 21:17:33 38.8N 122.9W MB=2.6 NEIC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 4.8 in Myanmar was felt with intensity up to II-III in the area(s) of Myanmar in Chauk, Magway and in Bangladesh at Chattagam.
O: 05AUG2026 00:11:57 21.9N 94.6E MB=4.0 NEIC MYANMAR
NEIC reported an earthquake of M 2.8 in Central California was felt with intensity up to II-III in the area(s) of Central California in San Simeon and Cambria.
O: 04AUG2026 19:55:25 35.6N 121.1W MB=2.8 NEIC CENTRAL CALIFORNIA
NEIC reported an earthquake of M 4.6 off the east coast of Honshu, Japan was felt with intensity up to II-III in the area(s) of off the east coast of Honshu, Japan in Sendai, Miyagi.
O: 04AUG2026 14:00:26 38.3N 142.3E MB=4.6 NEIC OFF EAST COAST OF HONSHU, JAPAN
NEIC reported an earthquake of M 3.3 in Central California was felt with intensity up to II-III in the area(s) of Central California in Fresno and Santa Maria.
O: 04AUG2026 13:21:09 36.1N 119.9W MB=3.3 NEIC CENTRAL CALIFORNIA
NEIC reported an earthquake of M 2.6 in Missouri was felt with intensity up to II-III in the area(s) of Missouri in Caruthersville, Saint Louis, Hazelwood, Warsaw, Hornersville and possibly as far as Illinois.
O: 04AUG2026 12:04:40 36.1N 89.8W MB=2.6 NEIC MISSOURI
EMSC reported an earthquake of M 4.2 in Southern Iran was felt with intensity up to IV in the area(s) of Southern Iran in Gerash.
O: 05AUG2026 00:25:03 27.7N 54.0E MB=4.2 EMSC SOUTHERN IRAN
An earthquake in central Italy of M 4.3 was at 103 degrees from the eye of ST Dolphin
on August 3, 2026. EMSC reported this earthquake was felt widely in central
Italy with strong motion and noise in Marina di Pisa-Tirrenia-Calambrone, Livorno, Pisa, Madonna dell'Acqua, Uliveto Terme, Caprona, Quattro Strade, Fornacette Asciano, Ponsacco, Pontedera, Ripafratta-Farneta, Calcinaia, Viareggion, Cascine-La Croce, among others.
No major damage was reported. This is an unusual earthquake location and
could affect some old structures such as the leaning tower of Pisa as the
epicenter was a couple of km from the City of Pisa. The last earthquake
within about 100 km of this epicenter in Central Italy with M>=4.2 occurred
as an M 5.1 about 100 km east of this epicenter on September 18, 2023.
At the time this summary noted:
"An unusually large M 5.1 struck the area of Northern Italy today. NEIC reported it was felt with maximum intensity IV in San Godenzo, Toscana, Brisighella Emilia-Romagna, Castrocaro Terme and Terra del Sole and Forli with lesser shaking in Borgo, San Lornzo, Scarperia, Riolo Terme, Pontassieve and Imola among others.
This is the strongest earthquake in northern Italy within about 200 km of
this epicenter since an M 5.6 about 200 km to the east on November 9, 2022 but the
last within about 100 km of today's epicenter was an 6.1 on May 20, 2012 and and M 5.5
aftershock on May 29, 2012. At the time of the May 20, 2012 event this summary noted:
"Three strong earthquakes of M 5.8-6.1 hit in the world today and were probably
triggered by tidal forces associated with the upcoming solar eclipse which
will occur later today. The most widely felt and damaging of today's events
occurred as an M 6.1 in northern Italy ...
The last earthquake in northern Italy of similar or larger magnitude (and the only such
event in the past 22 years) was an M 6.4 on September 26, 1997." (May 20, 2012, September 18, 2023)
O: 04AUG2026 08:15:18 43.6N 10.3E ML=4.3 EMSC CENTRAL ITALY
The earthquake in Madagascar was also an unusual event. While it was not
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM KUJIRA (DEPRESSION 13W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS KUJIRA 2026-08-05 00:00 UT 17.8N 119.0E 45 kts Northern Philippines
TS Kujira formed today and made landfall in the northern Philippines with winds up to 50 kts. It is expected to make a second landfall in the northern Philippines tomorrow after reversing direction and tracking over that area on August 5-6. Moderate earthquakes could be triggered in the Philippines with these two landfall events. The antipode at 18S 61W is in eastern Bolivia and northern Chile where a regional moderate earthquake could be triggered from antipodal energy with this storm.
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP DOLPHIN 2026-08-05 00:00 UT 25.5N 137.2E 115 kts North-central Pacific west of Bonin Islands, Japan
Super-Typhoon Dolphin (TD 12W) continued today in the north-central Pacific west of Bonin Islands, Japan with winds up to 115 kts. It will track towards south of Honshu and into the Ryukyu Islands reaching that area with winds up to 115 kts. A moderate earthquake could be triggered near landfall in that area. The antipode at 25S 43W is in the South Atlantic Ocean near Tristan da Cunha where some enhancement of seismicity was observed yesterday.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of August 4, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0556 0622 0745 C1.6 (August 5, 2026) 4.8E-03 *
Mindanao M 4.9, 5.1 05:57, 05:59 UT M 4.6 06:41 UT
Guatemala M 4.3 06:13 UT
Chiapas M 4.2 06:41 UT
Auckland New Zealand M 5.2 06:44 UT
Costa Rica M 4.0 06:53 UT
Kermadec Is. M 6.3 07:43 UT
1170 1152 1158 1202 C1.2 (August 4, 2026) 5.6E-04
Tajikistan M 4.0 11:53 UT
Missouri M 2.5 12:04 UT
1180 1402 1408 1415 C1.0 (August 4, 2026) 7.9E-04
Oaxaca M 4.0 14:27 UT
Honshu N 4,6 14:01 UT
1200 1526 1534 1537 C1.1 (August 4, 2026) 6.4E-04
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: quiet August 5-6 unsettled August 7. Solar M-flare chance: 20% X-class: 1% proton storm: 1%
AP Indicies: global: 10, high: 14, mid-latitude: 11, time of max k: 00:00-06:00 UT; Max k: 4 Global Kp 4.00 0000-0300, August 4; Sunspot Number: 100; Radio Flux: 118
The Hp30 index (GFZ) did not exceed 1.33 today. No geomagnetic storms were observed.
August 4, 2026
Notable earthquakes and events:
In the previous issue of this summary it was reported that a highly unusual
earthquake in Suez, Egypt and a light earthquake near Quebec City, Quebec
were at a distance near 101-103 degrees from the eye of Super-Typhoon Dolphin at the time
of their occurrence. This distance relation continued today with several
other unusual earthquakes and volcanic episodes at 102-103 degrees from the current
eye of Typhoon Dolphin. These included a widely felt earthquake in Central
Italy of M 4.3 at 102 degrees from ST Dolphin; an M 4.2 in Madagascar at
103 degrees from Dolphin and a violent eruption of Fuego in Guatemala.
The eruption of Volcan de Fuego (at 14.5N 90.9W) southwest of Guatemala City spewed columns of lava,
lahars and ash as far as four km into the sky. News reports on the internet
reported evacuations have been ordered far areas west of the volcano and especially within about
10 km of the eruption. Schools have been shut and businesses have been
closed for the duration of this major eruption. Volcan de Fuego was at
102 degrees from ST Dolphin two days ago (on August 1-2, 2026) and was probably prepared for
today's eruption at that time by concentrated energy from that storm.
Michoacan, Mexico is currently at 103 degrees from ST Dolphin and some
seismic promotion may occur in western Mexico in the next several days
due to this relation.
O: 03AUG2026 12:00:00 14.5N 90.9W ERUPT NEWS VOLCANIC ERUPTION OF FUEGO, GUATEMALA
The earthquake in central Italy was at 103 degrees from the eye of ST Dolphin
on August 3, 2026. EMSC reported this earthquake was felt widely in central
Italy with strong motion and noise in Marina di Pisa-Tirrenia-Calambrone, Livorno, Pisa, Madonna dell'Acqua, Uliveto Terme, Caprona, Quattro Strade, Fornacette Asciano, Ponsacco, Pontedera, Ripafratta-Farneta, Calcinaia, Viareggion, Cascine-La Croce, among others.
No major damage was reported. This is an unusual earthquake location and
could affect some old structures such as the leaning tower of Pisa as the
epicenter was a couple of km from the City of Pisa. The last earthquake
within about 100 km of this epicenter in Central Italy with M>=4.2 occurred
as an M 5.1 about 100 km east of this epicenter on September 18, 2023.
At the time this summary noted:
"An unusually large M 5.1 struck the area of Northern Italy today. NEIC reported it was felt with maximum intensity IV in San Godenzo, Toscana, Brisighella Emilia-Romagna, Castrocaro Terme and Terra del Sole and Forli with lesser shaking in Borgo, San Lornzo, Scarperia, Riolo Terme, Pontassieve and Imola among others.
This is the strongest earthquake in northern Italy within about 200 km of
this epicenter since an M 5.6 about 200 km to the east on November 9, 2022 but the
last within about 100 km of today's epicenter was an 6.1 on May 20, 2012 and and M 5.5
aftershock on May 29, 2012. At the time of the May 20, 2012 event this summary noted:
"Three strong earthquakes of M 5.8-6.1 hit in the world today and were probably
triggered by tidal forces associated with the upcoming solar eclipse which
will occur later today. The most widely felt and damaging of today's events
occurred as an M 6.1 in northern Italy ...
The last earthquake in northern Italy of similar or larger magnitude (and the only such
event in the past 22 years) was an M 6.4 on September 26, 1997." (May 20, 2012, September 18, 2023)
O: 04AUG2026 08:15:18 43.6N 10.3E ML=4.3 EMSC CENTRAL ITALY
The earthquake in Madagascar was also an unusual event. While it was not
reported felt in the epicentral area of Madagascar, the last event within
about 200 km of this epicenter with equal or greater magnitude occurred as an M 4.7
on May 23, 2019, the strongest in the area in the past 35 years.
At the time this summary reported:
"The most unusual earthquake of the day was an M 4.7 in Madagascar. It was not
reported felt in this area.
This is the strongest earthquake within about 200 km of this epicenter inh at least
30 years. Events of M 4.6-4.7 occurred nearby on January 5, 205 and October 30, 2015.
This epicenter is located at 103 degrees from the epicenter of the M 7.5 in New Britain
of May 14, adding to the increasing number of unusual events at this distance
from New Britain in the past week. This had been detailed in the previous issue
of this report when unusual quakes hit the South Pacific and Jalisco, Mexico.
Unusual quakes at this distance also occurred in Colorado (M 3.8 and in the
Central Pacific Rise (M 5.9) in the past week. This summary noted in the
previous issue:
"Far-field triggering from the M 7.5 in New Britain of May 14, 2019 continued
unabated today. The strongest earthquakes of the day occurred at 101-102 degrees
from that epicenter - an M 5.4 in the area south of Easter Island and a series
of events up to M 4.7 in Jalisco, Mexico. Seismic energy is concentrated at
this distance following major events on the earth's surface after reflection
and refraction off the core-mantle boundary returns this energy to this distance
zone on the surface. Previous activity at this distance from New Britain
in the past week included an M 3.8 in Colorado and an M 5.8 in the Central East Pacific
Rise" (May 23, 2019)
O: 03AUG2026 10:40:28 12.8S 48.1E ML=4.2 EMSC MADAGASCAR
Moderate aftershocks continued today in the region of Kyushu, Japan.
Tolls continued to rise as rescue teams combed the area and sifted through
debris of collapsed structures and a mall. Those dead now exceed 32 but this is
expected to rise. The strongest aftershock today was an M 4.4. NEIC reported
it was felt with intensity III in Miyazaki and Kagoshima, Japan.
O: 04AUG2026 05:06:30 32.5N 130.5E ML=4.4 EMSC KYUSHU, JAPAN
O: 03AUG2026 20:32:30 32.6N 130.7E ML=4.1 EMSC KYUSHU, JAPAN
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026. The strongest event
in the area today was an M 4.5.
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 03AUG2026 21:46:51 13.9N 92.6W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 03AUG2026 09:19:12 14.1N 93.5W mb=4.5 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 04AUG2026 04:34:29 14.1N 93.6W ML=4.6 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 04AUG2026 04:27:58 14.2N 93.6W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 04AUG2026 06:52:20 14.2N 93.4W ML=4.6 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 04AUG2026 07:01:36 14.2N 93.6W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 03AUG2026 07:48:48 14.3N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 04AUG2026 07:07:10 14.3N 93.4W mb=4.6 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 04AUG2026 05:58:49 14.5N 93.2W mb=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 03AUG2026 07:38:54 14.8N 93.1W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 03AUG2026 22:05:47 14.8N 93.3W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 03AUG2026 19:39:09 14.9N 93.3W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
NEIC reported an earthquake of M 4.8 in Southeastern Alaska was felt with intensity up to II-III in the area(s) of Southeastern Alaska of Ketchikan.
This is the strongest earthquake in Southeastern Alaska within about 150
km of this epicenter since an M 4.9 on February 25, 2013. At the time this summary noted:
"An earthquake of M 4.4-4.7 also accompanied this alignment in the Queen
Charlotte Islands of British Columbia. Earthquakes Canada noted this earthquake
was felt in the epicentral region. An M 7.7 hit this epicenter on October 28,
2012 but this is the strongest aftershock in the area since early November, 2012.
Some residents in Haida Gwaii reported short but strong shaking of houses.
There were no damages or injuries reported." (February 25, 2013)
It occurred within minutes of local solar midnight and may have been
promoted by tidal and/or geomagnetic stresses which maximize near this hour.
This epicenter is near the sixth node (60 degrees) from Super-Typhoon Dolphin,
Chiapas and Kyushu and Venezuela and may have been promoted by constructive
energy interference from those sources.
O: 03AUG2026 09:17:46 53.8N 133.0W MW=4.8 NEIC SOUTHEASTERN ALASKA
EMSC reported an earthquake of M 4.4 in Atacama, Chile was felt with intensity up to IV in the area(s) of Atacama, Chile in Vicuna.
O: 03AUG2026 20:47:07 28.7S 70.3W MB=4.4 EMSC ATACAMA, CHILE
O: 03AUG2026 06:56:36 20.3S 69.2W mb=4.0 EMSC TARAPACA, CHILE
EMSC reported an earthquake of M 4.7 in Morocco was felt with intensity up to IV in the area(s) of Morocco in Assoul, Tinghir.
This epicenter is at the sixth node (60 degrees) from Venezuela and
may have been promoted by energy from that source.
O: 03AUG2026 20:14:45 32.2N 5.2W MW=4.7 EMSC MOROCCO
EMSC reported an earthquake of M 4.7 in the Kuril Islands was felt with intensity up to IV in the area(s) of Shikotan Russia.
O: 03AUG2026 14:39:45 43.2N 146.9E MB=4.7 EMSC KURIL ISLANDS
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP DOLPHIN 2026-08-04 00:00 UT 25.2N 141.7E 135 kts North-central Pacific
Super-Typhoon Dolphin (TD 12W) continued today in the north-central Pacific with winds up to 135 kts. It is expected to reach the Bonin Islands, Japan today and may help trigger moderate regional seismicity near landfall. It will then track towards southern Honshu and the Ryukyu Islands reaching that area with winds up to 125 kts. A moderate earthquake could be triggered near landfall in that area. The antipode at 25S 38W is in the South Atlantic Ocean near Tristan da Cunha where some enhancement of seismicity was observed yesterday.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of August 3, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
1130 0039 0049 0108 C1.0 (August 3, 2026) 1.6E-03
1140 0914 0925 0934 C1.3 (August 3, 2026) 1.4E-03
Chiapas M 4.5 09:19 UT
1100 1128 1133 1143 C1.4 (August 3, 2026) 1.1E-03
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: quiet August 4-6. Solar M-flare chance: 20% X-class: 1% proton storm: 1%
AP Indicies: global: 19, high: 28, mid-latitude: 17, time of max k: 16:00-18:00 UT; Max k: 5 Global Kp 4.33 0000-0300, August 3; Sunspot Number: 104; Radio Flux: 126
The proton storm has dissipated. No sudden changes in geomagnetic field
strength were recorded on GOES magnetometers. The geomagnetic storm continued
into early UT August 4 but largely dissipated by 02:00 UT on August 4, 2026.
August 3, 2026
Notable earthquakes and events:
A moderate (G1) geomagnetic storm occurred today and was short-lived. This storm reach high latitude
k-index about 17:00 UT of 7 and planetary K-index of 5.67 about the same time.
The Hp30 index (GFZ) reached a maximum value of 6.0 about 17:00 UT indicating
a sudden commencement storm but was elevated about 12:00 UT earlier in the day at levels near 5.
The last occurrence of a high latitude k-index of 7 occurred on July 12 and the last of planetary k-index
of 5.66 or higher was on June 5, 2026 when it reached Kp of 6.33.
A series of earthquakes marked this sudden commencement storm including an M 4.6 in Peru and an M 4.4 in Panama, both of which
occurred within minutes of local solar noon. But the most interesting earthquake at
the commencement of this storm was an M 4.4 in the Laos-Vietnam border, a
rare event which occurred within minutes of local solar midnight.
The first strike of this geomagnetic storm near 12:00 UT was accompanied
by one of the strongest earthquakes in the world today - an M 5.6 north
of Ascension Island in the mid-Atlantic area.
A strong excursion in the geomagnetic field measured on the magnetometer
on GOES-19 located directly over head of the Dominican Republic at 72.5 West longitude
occurred at 05:00 UT. Also at 05:00 an M 4.5 earthquakes occurred in the
Dominican Republic and a few seconds earlier at the opposite longitude on
the earth as an M 4.9 in Sichuan, China within about a minute of local solar
noon (local solar midnight in Dominican Republic). This summary has noted many such simultaneities
over the past several months and at this point a mutual trigger for both the
earthquake and the geomagnetic excursion seems highly likely.
An unusually large earthquake of M 5.0 was widely felt in north Africa in the
area of Egypt today. This event occurred in the Suez region of Egpyt and was
reported by EMSC to have been widely and strongly felt in Egypt at Suez, Ismailia, Bilbays, Ain Sukhna, New Cairo, At Tall al Kabir, Faqus, Al Qurayn, Port Said among others. EMSC reported moderate shaking from this event was felt as far as Cyprus, Lebanon, Israel, Palestine, Alexandria, Cairo and Giza, Egypt, Jordan.
NEIC reported intensity V in Egypt at El Zagazig, Fakoos, Kafr Sakr, Suez with IV in El Asher men Ramadan, Mashtool el Sook, Benhan, El Ismailia, Kafr el Sheikh, El Qiniat, Basyoon, Cairo among others. It was also reported felt in Saudi Arabia, Palestine, Israel, Jordan, Cyprus, Judea and Samaria.
The last earthquake within about 200 km of this epicenter with M>=5 occurred as an M 5.8 on
October 12, 1992. Most earthquakes in the area of M>=5 occur about 250 km southeast
of today's epicenter. When an M 5.2 hit southwest of this epicenter on June 27, 2015 this summary
noted it as:
"A pair of unusual earthquakes at about 15 degrees north of the geomagnetic equator
These were located at 26 North latitude in Egypt (M5.2) and Assam, India (M 5.5). Early on
June 28, another unusual earthquake of M 5.0 hit the Island of Hawaii. This
activity was probably promoted by the now-concluded geomagnetic storm of the
past five days, the second strongest of the year.
NEIC reported the earthquake in Egypt was felt with intensity II-III in Saudi Arabia at Haqi, Tabuk, al-Bad, al-Madinah; in Egypt with intensity IV in El Tur, South Sanai, and II-III in Asyut, El Qosiyia, Port Said, Gizeh, El Hawamidiyah, Cairo, El Mansura, Hurghada, Abo el Matamer, Shubra-El-Khema, Abo Hammad-al-Mahattah, El Aher men Ramadan, El Zagazig; in Israel at Ashqelon, Be'er Sheva, Elat, Mizpe Ramon, Netanya, Petah Tiqwa, Rishon LeZiyyon, Bet Shemesh, Jerusalem, Ramat Gan, Ramat HaSharon, Tel Aviv-Yafo and in Jordan with intensity IV in al-'Aqahab and Irbid.
The last earthquake within 250 km of this epicenter of M>=5.2 occurred on
May 10, 1997 with M 5.3. An earthquake of M 7.2 hit about 50 km south of this
epicenter on November 22, 1995. ... This earthquake is located
at the fourth node (90 degrees) from the M 7.8 in the Bonin Islands of May 30
and may have been promoted by that event. A series of shocks south of this
in the Red Sea several days ago was similarly located." (June 27, 2015)
The epicenter of this event in Egpyt is at 101 degrees from the eye of Super-typhoon – similar to the distance from Dolphin to an unusual earthquake in Quebec today (see below) at the time of its occurrence. This summary has previously discussed the possibility of triggering at this distance from major ocean storms and
this appears to be a good example of that. Readers may note the event in 2015
was also associated with a strong geomagnetic storm in addition to a strong earthquake in the North Pacific (see above).
The reference to the event (see above) in the Red Sea is also applicable as an event
in that area occurred two days ago.
O: 03AUG2026 00:00:33 30.3N 32.6E MW=5.0 EMSC EGYPT
O: 01AUG2026 01:24:09 19.0N 39.1E MB=4.6 EMSC RED SEA
A moderate earthquake of M 4.5 was widely felt in the area of the Dominican
Republic today. NEIC reported intensity IV in the Dominican Republic at Monte Plata, III in Samana, Las Terrenas, Jamao al Norte Espaillat, Nagua Maria; II in Santo Domingo, Hato Mayor and Ramon Santana.
EMSC reported moderate shaking was reported from the Dominican Republic in Las Terrenas, Samana, Nagua, Santo Domingo Este, Ensanche Luperon, La Agustina, La Julia, San Pedro de Macoris.
The last earthquake in the Dominican Republic with M>=4.5 within about 100
km of this epicenter occurred as an M 4.5 on April 17, 2023. At the time this
summary noted:
"An earthquake in the Dominican Republic occurred today with M 4.5. NEIC reported maximum intensity IV in the Dominican Republic at San Francisco de Macoris Duarte, Santiago, Ssn Pedgro de Macoris and II-III in Nagua Maria, Las Terrenas, Santo Domingo, El Carril.
This event is located at a maximum tidal stress longitude with the new moon and eclipse
of April 20, 2023 and is considered a location where enhanced seismicity is likely
with that alignment." (April 17, 2023)
This earthquake occurred within minutes of local solar midnight and may have
been promoted by strong tidal and geomagnetic stresses which maximize near this
hour. A strong excursion in the geomagnetic field measured on the magnetometer
on GOES-19 located directly over head of the Dominican Republic at 72.5 West longitude
occurred at 05:00 UT. This required an arcjet maneuver to correct the
orbit of the satellite. This summary has noted many such simultaneities
over the past several months and at this point a mutual trigger for both the
earthquake and the geomagnetic excursion seems highly likely.
This epicenter is at the third node (120 degrees) from the current eye of
Super-typhoon Dolphin and from Kyushu and may have been promoted by energy from
those sources.
O: 03AUG2026 05:01:20 19.2N 69.6W MW=4.5 EMSC DOMINICAN REPUBLIC
About 30 seconds before the event in the Dominican Republic an M 4.9 occurred
in eastern Sichuan, China. This event occurred within a couple of minutes
of local solar noon in Sichuan and was probably triggered by tidal and/or
geomagnetic stresses. The relation between the timing of this event
opposite in longitude to that of the Dominican Republic is curious.
This epicenter is at the 12th node (30 degrees) from Kyushu and may have
been promoted by energy from that source.
O: 03AUG2026 05:00:48 28.7N 104.8E MW=4.9 EMSC EASTERN SICHUAN, CHINA
One of the strongest earthquake in the world today was an M 5.6-6.1 near North Island, New Zealand. NEIC
reported it was felt with intensity V in the Bay of Plenty at Te Kaha and IV in Whakatane and in Gisborne, New Zealand. Intensity II-III was felt in Matata, Patutahi, Napier, Kawerau, TePuke, and Taupo.
GEONET Reported the following parameters for this earthquake:
O: 02AUG2026 08:35:27 37.7S 178.3E MB=6.1 GEONET 5240 people reported feeling this earthquake with 2611 at weak intensity and 1978 with light shaking and 563 with moderate intensity 73 with strong, 6 with severe and 9 with extreme intensity.
The last earthquake off North Island, New Zealand within about 200 km of
today's epicenter with M>=5.6 was an M 5.8 on May 5, 2025. At the time this
summary noted:
"A strong M 5.8-6.0 earthquake accompanied the geomagnetic storm today
in the area off north Island New Zealand today. This area was at local
solar noon conditions at the peak of the geomagnetic storm and was probably
promoted by effects from that storm. NEIC reported the mainshock was felt
with intensity III in Naikato and Bay of Plenty, New Zealand at Tairua, Coromandel, Whitianga, Tauranga, Te Puke, Whangamata, Pauanui, Thames and II in Waiheke, and Manukau, Auckland.
GeoNet reported the following data for this activity:
O: 05MAY2026 08:00:41 36.6S 177.2E MB=6.0 GEONET 1958 people reported feeling this earthquake with 1436 at weak intensity and 472 with light shaking and 44 with moderate intensity 4 with strong, 0 with severe and 2 with extreme intensity.
O: 05MAY2026 08:05:39 36.9S 177.1E ML=4.2 GEONET 1083 people reported feeling this earthquake with 780 at weak intensity and 277 with light shaking and 22 with moderate intensity 3 with strong, 0 with severe and 1 with extreme intensity.
The mainshock was followed by a number of moderate sized aftershock including those of M 4.5 and 4.9. The last earthquake within about 200 km of this epicenter in New Zealand
with M>=6 occurred as an M 6.5 on December 15, 1994. An M 6.0 hit about 250 km southeast of today's
epicenter on April 5, 2021 - an aftershock of an M 7.3 on March 4, 2021.
At the time this summary noted:
"... Kermadec Islands (M 8.1 on the same day - March 4, 2021) follows an M 7.3 off North Island, New Zealand which occurred earlier in
the day. NEIC reported this event was felt with maximum intensity VII in Gisborne at Tokomaru Bay; VI in Te Karaka, Opotiki; V in Ruatoria, Gisborne, the Bay of Plenty, IV in Patutahi, Whakatane, Matata and Kawerau, Bay of Plenty. and was summarized in the previous issue of this summary.
The earthquake of M 7.1-7.3 shook the region of North Island, New Zealand today.
GEONET reported this earthquake was felt with moderate to strong intensity in North Island, New Zealand with 13854 reporte of which 3874 reported weak shaking; 5016, light, 4158 moderate, 756 strong, 46 Severe and 12 extreme intensity.
No major damage was reported with this earthquake, but a minor tsunami may occur
in the region of North Island. The last earthquake within about 250 km of
today's epicenter within about 250 km of this epicenter with M>=7.3 occurred
more than 30 years ago. The only earthquake recorded in this region north
of North Islands in history of larger magnitude was an M 7.9 under North
Island on February 2, 1931. This was the Hawke's Bay earthquake and caused
a great deal of damage in North Island especially near Napier.
Today's earthquake occurred within about an hour of local solar midnight and
may have been promoted by strong tidal stresses with the full moon .." (May 5, 2026) which
O: 02AUG2026 08:35:27 37.7S 178.3E MW=5.6 EMSC OFF E. COAST OF N. ISLAND, N.Z
EMSC reported an earthquake of M 4.1 in Spain was felt with intensity up to II-III in the area(s) of Spain in Pliego, Alcantarilla, Sangonera la Verde, Murcia, Bullas, Blanca, Los Martinez, Mazarron, Fuente-Alamo de Murcia, Caravaca, Lorca, Bigastro, San Miguel de Salinas, Algorfa, Rojales, Hellin, Puerto Lumbreras, Elche, Alicante.
The last earthquake in Spain within about 150 km of this epicenter
of significantly larger magnitude occurred as an M 5.1 on May 11, 2011.
At the time this summary noted:
A highly unusual antipodal pair of earthquakes hit first as a pair in and east of North Island,
New Zealand today and was finished by damaging pair of earthquakes in southern Spain
nine hour later. These are both highly unusual events. The largest event
in the New Zealand region is the strongest in that area off North Island
in the past 10 years, since an M 7.1 on August 21, 2001 hit about 50 km south
of this epicenter and was followed by aftershocks through March, 2002. The
only other such event in this region was an M 5.3 on February 9, 1995.
The earthquakes in Spain were the largest in that region in more than 20
years. A deep-focus earthquake of M 6.3 had its epicenter about 200 km to the
southwest of this under Spain last year on April 11, 2010.
...
The initial event in the New Zealand series of M 4.8-5.0 was located within
less than 100 km of being exactly antipodal to the subsequent earthquakes
in Spain. Earthquakes are exactly antipodal if their latitudes are the same
and their longitudes are in opposite hemispheres and numerically add to 180.
In this case the latitudes are 38 South for New Zealand and 38 North for Spain
and the longitudes are 178 East for New Zealand and 2 West for Spain. This
is an exact antipodal pair, highly unusual and very likely related to each
other. There are many possible causes of antipodal pairs but in this
case the most likely appears to be a direct seismic connection. Seismic
energy is concentrated at the antipode (exact opposite point on the earth)
because of the spherical shape of the earth. Where antipodal regions are
seismic, antipodal pairs are common but antipodal events in two regions which see rare earthquakes
such as occurred today are much more significant in the hypothesis of
antipodal triggering." (May 11, 2011)
Today's earthquake in Spain occurred one hour and 24 minutes after an M 5.6-6.1 in
New Zealand.
This epicenter is at 101 degrees from Kyushu and may have been promted by energy
from that source.
O: 02AUG2026 09:59:25 37.9N 1.4W MW=4.1 EMSC SPAIN
Compare the antipodality of this earthquake in Spain with the New Zealand
earthquake. Epicenters are antipodal if they lie in different hemispheres
with the same N/S latitude and the longitudes lie in different hemispheres
and numerically add to 180 degrees. In this case compare 37.9N and 37.7S and 1.4W 178.3E =179.7.
O: 02AUG2026 08:35:27 37.7S 178.3E MW=5.6 EMSC OFF E. COAST OF N. ISLAND, N.Z
Moderate to strong aftershocks continued today in the region of Kyushu, Japan.
Tolls continued to rise as rescue teams combed the area and sifted through
debris of collapsed structures and a mall. Those dead now exceed 32 but this is
expected to rise. The strongest aftershock today was an M 4.6. NEIC reported
it was felt with intensity III in Miyazaki and Kagoshima, Japan.
O: 02AUG2026 10:00:08 32.3N 130.7E MW=4.6 NEIC KYUSHU, JAPAN
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026. The strongest event
in the area today was an M 4.5.
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 03AUG2026 09:19:09 14.0N 93.6W MW=4.5 NEIC CHIAPAS, MEXICO
EMSC reported an earthquake of M 5.2 in Central Peru was felt with intensity up to II-III in the area(s) of
NEIC reported intensity IV in Peru at Huanuco, III in Oxapampa, Moyobamba and II in Santa Maria, Lima.
This epicenter lies on the geomagnetic equator and is at 102 degrees from
New Zealand and may have been promoted by energy from thoses sources.
O: 03AUG2026 01:42:24 8.5S 75.8W MW=5.2 EMSC CENTRAL PERU
NEIC reported an earthquake of M 5.6 North of Ascension Island was not felt.
This is the strongest earthquake located within about 200 km of this epicenter
since an M 5.6 on June 25, 2002. At the time this summary noted:
This epicenter is located at 141 degrees from Kyushu and may have been promoted
by energy from that source.
O: 02AUG2026 11:52:33 3.2S 12.2W MW=5.6 EMSC NORTH OF ASCENSION ISLAND
O: 02AUG2026 09:17:11 3.3S 12.2W MW=5.0 EMSC NORTH OF ASCENSION ISLAND
NEIC reported an earthquake of M 4.8 in Southeastern Alaska was felt with intensity up to II-III in the area(s) of Southeastern Alaska of Ketchikan.
This is the strongest earthquake in Southeastern Alaska within about 150
km of this epicenter since an M 4.9 on February 25, 2013. At the time this summary noted:
"An earthquake of M 4.4-4.7 also accompanied this alignment in the Queen
Charlotte Islands of British Columbia. Earthquakes Canada noted this earthquake
was felt in the epicentral region. An M 7.7 hit this epicenter on October 28,
2012 but this is the strongest aftershock in the area since early November, 2012.
Some residents in Haida Gwaii reported short but strong shaking of houses.
There were no damages or injuries reported." (February 25, 2013)
It occurred within minutes of local solar midnight and may have been
promoted by tidal and/or geomagnetic stresses which maximize near this hour.
This epicenter is near the sixth node (60 degrees) from Super-Typhoon Dolphin,
Chiapas and Kyushu and Venezuela and may have been promoted by constructive
energy interference from those sources.
O: 03AUG2026 09:17:46 53.8N 133.0W MW=4.8 NEIC SOUTHEASTERN ALASKA
NEIC reported an earthquake of M 2.7 in Central California was felt with intensity up to II-III in the area(s) of Central California in Templeton.
O: 03AUG2026 03:13:58 35.3N 120.9W MW=2.7 NEIC CENTRAL CALIFORNIA
NEIC reported an earthquake of M 2.7 in Quebec, Canada was felt with intensity up to II-III in the area(s) of Quebec, Canada with III in Saint-Raymond and II in Quebec, Montreal and in Stoneham, Massachusetts.
This epicenter was at 102 degrees from the eye of Super-typhoon Dolphin at the time of its occurrence
and may have been promoted by energy from that source.
O: 03AUG2026 00:33:17 46.8N 71.3W MW=2.7 NEIC QUEBEC, CANADA
NEIC reported an earthquake of M 3.6 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaska in Chignik Lagoon and Chignik.
O: 02AUG2026 09:05:57 56.4N 158.6W MW=3.6 NEIC SOUTHERN ALASKA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP DOLPHIN 2026-08-03 00:00 UT 24.2N 151.7E 145 kts North-central Pacific
Super-Typhoon Dolphin (TD 12W) continued today in the north-central Pacific with winds up to 145 kts. It is expected to track to the west but little seismic enhancement is expected in this area at this time. It will then track towards southern Honshu and the Ryukyu Islands reaching that area with winds up to 105 kts. A moderate earthquake could be triggered near landfall. The antipode at 23S 28W is in the South Atlantic Ocean near Tristan da Cunha where some enhancement of seismicity could occur at this time.
HURRICANE GENEVIEVE (07E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR GENEVIEVE 2026-08-03 00:00 UT 23.7N 136.4W 55 kts North Pacific
Hurricane Genevieve continued today in the north Pacific with winds up to 55 kts. It is expected to track to the west but is unlikely to significantly affect regional seismicity at this time and to dissipate in the North Pacific around August 5. The antipode at 24S 44E is not a seismic zone.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of August 2, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
1020 0519 0535 0541 C6.3 (August 2, 2026) 4.0E-03
Andreanof Is. M 4.8 05:19 UT
Michoacan, M 4.2 05:22 UT
New Guinea M 4.9 05:39 UT
Papua M 3.9 05:44 UT
1010 0020 0033 0039 C4.0 (August 2, 2026) 2.9E-03
Honshu M 4.9 00:45 UT
Mount Ranier Washington M 2.3 00:42 UT
1020 0155 0202 0216 C1.6 (August 2, 2026) 1.9E-03
1060 1644 1650 1654 B8.4 (August 2, 2026) 5.8E-04
Banda Sea M 4.0 16:58 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: 2 active August 3 and quiet August 4-5. Solar M-flare chance: 30% X-class: 5% proton storm: 5%
AP Indicies: global: 17, high: 28, mid-latitude: 15, time of max k: 18:00-20:00 UT; Max k: 7 Global Kp 5.67 1700-2000, August 2; Sunspot Number: 105; Radio Flux: 127
A moderate (G1) geomagnetic storm occurred today and was short-lived. This storm reach high latitude
k-index about 17:00 UT of 7 and planetary K-index of 5.67 about the same time.
The Hp30 index (GFZ) reached a maximum value of 6.0 about 17:00 UT indicating
a sudden commencement storm but was elevated about 12:00 UT earlier in the day at levels near 5.
The last occurrence of a high latitude k-index of 7 occurred on July 12 and the last of planetary k-index
of 5.66 or higher was on June 5, 2026 when it reached Kp of 6.33.
A series of earthquakes marked this sudden commencement storm including an M 4.6 in Peru and an M 4.4 in Panama, both of which
occurred within minutes of local solar noon. But the most interesting earthquake at
the commencement of this storm was an M 4.4 in the Laos-Vietnam border, a
rare event which occurred within minutes of local solar midnight.
August 2, 2026
Notable earthquakes and events:
The strongest earthquake in the world today was an M 5.6 near North Island, New Zealand. NEIC
reported it was felt with intensity V in the Bay of Plenty at Te Kaha and IV in Whakatane and in Gisborne, New Zealand. Intensity II-III was felt in Matata, Patutahi, Napier, Kawerau, TePuke, and Taupo.
GEONET Reported the following parameters for this earthquake:
O: 02AUG2026 08:35:27 37.7S 178.3E MB=6.1 GEONET 5240 people reported feeling this earthquake with 2611 at weak intensity and 1978 with light shaking and 563 with moderate intensity 73 with strong, 6 with severe and 9 with extreme intensity.
The last earthquake off North Island, New Zealand within about 200 km of
today's epicenter with M>=5.6 was an M 5.8 on May 5, 2025. At the time this
summary noted:
"A strong M 5.8-6.0 earthquake accompanied the geomagnetic storm today
in the area off north Island New Zealand today. This area was at local
solar noon conditions at the peak of the geomagnetic storm and was probably
promoted by effects from that storm. NEIC reported the mainshock was felt
with intensity III in Naikato and Bay of Plenty, New Zealand at Tairua, Coromandel, Whitianga, Tauranga, Te Puke, Whangamata, Pauanui, Thames and II in Waiheke, and Manukau, Auckland.
GeoNet reported the following data for this activity:
O: 05MAY2026 08:00:41 36.6S 177.2E MB=6.0 GEONET 1958 people reported feeling this earthquake with 1436 at weak intensity and 472 with light shaking and 44 with moderate intensity 4 with strong, 0 with severe and 2 with extreme intensity.
O: 05MAY2026 08:05:39 36.9S 177.1E ML=4.2 GEONET 1083 people reported feeling this earthquake with 780 at weak intensity and 277 with light shaking and 22 with moderate intensity 3 with strong, 0 with severe and 1 with extreme intensity.
The mainshock was followed by a number of moderate sized aftershock including those of M 4.5 and 4.9. The last earthquake within about 200 km of this epicenter in New Zealand
with M>=6 occurred as an M 6.5 on December 15, 1994. An M 6.0 hit about 250 km southeast of today's
epicenter on April 5, 2021 - an aftershock of an M 7.3 on March 4, 2021.
At the time this summary noted:
"... Kermadec Islands (M 8.1 on the same day - March 4, 2021) follows an M 7.3 off North Island, New Zealand which occurred earlier in
the day. NEIC reported this event was felt with maximum intensity VII in Gisborne at Tokomaru Bay; VI in Te Karaka, Opotiki; V in Ruatoria, Gisborne, the Bay of Plenty, IV in Patutahi, Whakatane, Matata and Kawerau, Bay of Plenty. and was summarized in the previous issue of this summary.
The earthquake of M 7.1-7.3 shook the region of North Island, New Zealand today.
GEONET reported this earthquake was felt with moderate to strong intensity in North Island, New Zealand with 13854 reporte of which 3874 reported weak shaking; 5016, light, 4158 moderate, 756 strong, 46 Severe and 12 extreme intensity.
No major damage was reported with this earthquake, but a minor tsunami may occur
in the region of North Island. The last earthquake within about 250 km of
today's epicenter within about 250 km of this epicenter with M>=7.3 occurred
more than 30 years ago. The only earthquake recorded in this region north
of North Islands in history of larger magnitude was an M 7.9 under North
Island on February 2, 1931. This was the Hawke's Bay earthquake and caused
a great deal of damage in North Island especially near Napier.
Today's earthquake occurred within about an hour of local solar midnight and
may have been promoted by strong tidal stresses with the full moon .." (May 5, 2026) which
O: 02AUG2026 08:35:27 37.7S 178.3E MW=5.6 EMSC OFF E. COAST OF N. ISLAND, N.Z
Moderate to strong aftershocks continued today in the region of Kyushu, Japan.
Tolls continued to rise as rescue teams combed the area and sifted through
debris of collapsed structures and a mall. Those dead now exceed 32 but this is
expected to rise. The strongest aftershock today was an M 5.2. NEIC reported
it was felt with intensity III in Miyazaki and Kagoshima, Japan.
The events in Kyushu are at 102 degrees from the eye of Hurricane
Genevieve in the North Pacific off Mexico when the mainshock occurred. It is likely it was promoted
by energy from that powerful source.
O: 01AUG2026 19:10:49 32.0N 131.9E MW=5.2 EMSC KYUSHU, JAPAN
O: 01AUG2026 16:07:22 32.5N 130.6E mb=4.6 EMSC KYUSHU, JAPAN
O: 01AUG2026 12:47:24 32.7N 130.6E mb=4.9 EMSC KYUSHU, JAPAN
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026. The strongest event
in the area today was an M 5.0 in Guatemala. This earthquake in Guatemala
was reported by NEIC to have been felt with intensity IV in Guatemala at
Guatemala City, Puelbo Nuevo Vinas, Villa Nueva, Chimaltenango, San Marcos la Laguna, Solola, Antigua Guatemala, San Juan la Laguna, Jocotenango and Panajachel and in San Salvador, El Salvador.
EMSC reported strong shaking in Guatemala at Yepocapa, Palin, Antigua Guatemala, Villa Nueva, Petapa, San Pedro La Laguna, San Pablo Jocopilas, Mixco, Fraijanes, Solola, Santa Catarina Pinula, Chinautla, San Raimundo, Guatemala City, Cantel, Quetzaltenango, San Marcos and in El Salvador at Acjutla and Santa Tecla.
This epicenter is sub-solar on this day in August.
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 02AUG2026 02:39:41 14.2N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 01AUG2026 08:55:41 14.3N 93.7W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 01AUG2026 23:22:41 14.4N 93.0W mb=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 01AUG2026 23:35:26 14.5N 93.4W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 01AUG2026 08:21:49 14.6N 93.3W mb=4.6 EMSC OFFSHORE CHIAPAS, MEXICO
O: 01AUG2026 22:07:23 14.8N 93.3W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 01AUG2026 23:39:57 15.1N 92.7W mb=4.2 EMSC CHIAPAS, MEXICO
P: 26JUL2026 184061 14.0N 94.0W 3.5-5.5 BAAAA Chiapas, Mexico
The strongest earthquake in the world today was an M 5.6 in Vancouver, British
Columbia, Canada. NEIC reported it was felt with intensity II in Washington State at Mount Vernon, Marysville, Langley, and Camano Island.
For further details see the previous issue of this summary.
Like a number of other earthquake discussed in this summary in recent days
this epicenter is at the eighth node (45 degrees) from Chiapas, Mexico.
When a similar M 5.6 hit near today's epicenter on July 20, 2026 this summary
O: 31JUL2026 05:45:57 51.0N 125.5W ML=3.9 EMSC VANCOUVER ISLAND, CANADA REGIO
NEIC reported an earthquake of M 3.5 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaska in Kenai, Soldotna.
O: 02AUG2026 06:58:29 60.6N 151.7W ML=3.5 EMSC KENAI PENINSULA, ALASKA
NEIC reported an earthquake of M 4.5 in Venezuela was felt with intensity up to II-III in the area(s) of Venezuela with IV in Barquisimeto, Lara and San Felipe, Yaracuy and III in Carabobo at Valencia, Tacarigua and Moron.
O: 02AUG2026 03:16:48 10.5N 68.7W MB=4.5 EMSC YARACUY, VENEZUELA
NEIC reported an earthquake of M 4.5 in Valparaiso, Chile was felt with intensity up to II-III in the area(s) of Valparaiso, Chile in Santiago.
O: 02AUG2026 01:21:36 33.5S 72.1W MW=4.5 EMSC OFFSHORE VALPARAISO, CHILE
NEIC reported an earthquake of M 3.2 in Southern California was felt with intensity up to II-III in the area(s) of Southern California in Palm Springs, Yucca Valley, Palm Desert, Joshua Tree, Rancho Mirage, Indian Wells, La Quinta, Desert Hot Springs, Corona, Cathedral City.
O: 01AUG2026 16:51:05 34.0N 116.3W ML=3.2 EMSC SOUTHERN CALIFORNIA
NEIC reported earthquakes of M 3.7, 2.8 and 2.7 in Northern California were felt with intensity up to II-III in the area(s) of the Geysers, California in Cloverdale.
O: 01AUG2026 07:57:45 38.8N 122.9W MW=3.7 EMSC NORTHERN CALIFORNIA
O: 01AUG2026 11:35:26 38.8N 122.9W MD=2.8 EMSC NORTHERN CALIFORNIA
O: 01AUG2026 11:50:40 38.8N 122.9W MD=2.7 EMSC NORTHERN CALIFORNIA
NEIC reported two earthquakes of M 5.2 each in the Tristan da Cunhan area of the South -Mid-Atlantic were not felt today.
These events are near the antipode of Super-typhoon Dolphin and may
have been promoted by energy from that storm. They are also at the fourth node (90
degrees) from Chiapas and may have also been promoted by energy from that source.
These earthquake of M 5.2 are the strongest within about 200 km of their
epicenter since an M 5.2 on September 12, 2025 and an M 5.2 on July 27, 2026 about 500 km north of today's epicenter. At the time this summary noted:
"The earthquake of M 5.2 in the Tritan da Cunha region of the South Atlantic occurred in the
area of the South Atlantic Geomagnetic anomaly. It is the strongest earthquake
within about 200 km of this epicenter since an M 5.4 on February 10, 2026 - the same
day as an M 5.0 in the Andreanof Islands (see above). The last earthquake
in this area of significantly larger magnitude was an M 5.9 on August 31, 2020. At the time this summary noted:
At the time this summary noted it as:
"An earthquake in the South Atlantic in the Tristan da Cunha region of M 5.9
was also recorded today. The last event within about 300 km of this
epicenter with M>=5.9 was an M 7.0 on June 17, 2015 and an M 6.6 on February 16, 2005." (August 31, 2020)
and
"Seismicity around the world today exploded following the strongest geomagnetic
storm since late October, 2019. Today's activity appeared to be confined to
a series of large events in Ocean Ridges during the first half of the day, but
was followed early on September 1 by strong earthquakes in Atacama Chile of
M 6.8 and 6.3. The Ocean Ridge events occurred on nearly all the world's ocean
ridges including in the Central Atlantic, South Pacific, Indian Ocean and
an M 6.5 in the Central Mid-Atlantic yesterday." (August 31, 2020)
This epicenter is at 102 degrees from New Zealand an Hurricane Genevieve
and may have been promoted by constructive interference from those sources.
It is also at the fourth node (90 degrees) from Chiapas, Mexico and
may have been promoted by energy from that source as well." (July 26, 2026)
O: 01AUG2026 11:07:20 39.6S 15.9W MB=5.2 EMSC TRISTAN DA CUNHA REGION
O: 01AUG2026 09:50:34 39.7S 16.1W mb=5.2 EMSC SOUTHERN MID-ATLANTIC RIDGE
NEIC reported a minor swarm of earthquakes with largest of M 4.1 in the Virgin Islands was felt with intensity up to II-III in the area(s) of the Virgin Islands in Puerto Rico at Ponce.
O: 01AUG2026 20:08:28 18.7N 64.9W MD=3.0 EMSC VIRGIN ISLANDS REGION
O: 02AUG2026 01:34:19 18.7N 64.9W MD=3.1 EMSC VIRGIN ISLANDS REGION
O: 01AUG2026 20:00:41 18.8N 64.9W MD=4.1 EMSC VIRGIN ISLANDS REGION
O: 01AUG2026 20:37:47 18.8N 64.9W MD=3.4 EMSC VIRGIN ISLANDS REGION
O: 02AUG2026 00:41:58 18.8N 64.9W MD=3.0 EMSC VIRGIN ISLANDS REGION
O: 02AUG2026 01:38:59 19.0N 64.3W MD=3.3 EMSC VIRGIN ISLANDS REGION
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP DOLPHIN 2026-08-02 00:00 UT 23.2N 152.7E 145 kts North-central Pacific
Super-Typhoon Dolphin (TD 12W) continued today in the north-central Pacific with winds up to 145 kts. It is expected to track to the west but little seismic enhancement is expected in this area at this time. It will then track towards southern Honshu and the Ryukyu Islands reaching that area with winds up to 105 kts. A moderate earthquake could be triggered near landfall. The antipode at 23S 28W is in the South Atlantic Ocean near Tristan da Cunha where some enhancement of seismicity could occur at this time.
HURRICANE GENEVIEVE (07E)
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HURR GENEVIEVE 2026-08-02 00:00 UT 23.7N 136.4W 55 kts North Pacific
Hurricane Genevieve continued today in the north Pacific with winds up to 55 kts. It is expected to track to the west but is unlikely to significantly affect regional seismicity at this time and to dissipate in the North Pacific around August 5. The antipode at 24S 44E is not a seismic zone.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of August 1, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0519 0535 0541 C6.3 (August 2, 2026) 4.0E-03
Andreanof Is. M 4.8 05:19 UT
Michoacan, M 4.2 05:22 UT
New Guinea M 4.9 05:39 UT
Papua M 3.9 05:44 UT
920 0222 0226 0230 C1.1 (August 1, 2026) 5.8E-04
Hokkaido M 5.5 02:48 UT
Central America M 4.4 02:47 UT
940 1324 1330 1336 C1.0 (August 1, 2026) 7.5E-04
970 2002 2011 2020 C2.0 (August 1, 2026) 2.1E-03
Kuril Is. M 5.2 20:02 UT
970 2020 2026 2030 C1.9 (August 1, 2026) 1.2E-03
Iraq M 4.6 20:27 UT
990 2229 2240 2247 C2.5 (August 1, 2026) 2.2E-03
Fiji M 4.4 22:29 UT
Baja California M 2.1 22:33 UT
Andreanof Is. M 4.9 23:07 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: major storms August 2 active August 3 and quiet August 4. Solar M-flare chance: 30% X-class: 5% proton storm: 5%
AP Indicies: global: 4, high: 3, mid-latitude: 5, time of max k: 11:00-15:00 UT; Max k: 2 Global Kp 1.33 1200-1400, August 1; Sunspot Number: 102; Radio Flux: 140
The proton storm that started two days ago has now diminished but is still active.
The Hp30 (GFZ) index did not exceed 3 in the past 24 hours.
August 1, 2026
Notable earthquakes and events:
The strongest earthquake in the world today was an M 5.6 in Vancouver, British
Columbia, Canada. NEIC reported it was felt with intensity II in Washington State at Mount Vernon, Marysville, Langley, and Camano Island.
Like a number of other earthquake discussed in this summary in recent days
this epicenter is at the eighth node (45 degrees) from Chiapas, Mexico.
When a similar M 5.6 hit near today's epicenter on July 20, 2026 this summary
noted:
"The strongest earthquake of the day was an M 5.6 in the Vancouver Island area of Canada.
NEIC reported this earthquake was felt with intensity IV in British Columbia, Canada at Port MacNeill and lesser intensity in Victoria and Port Hardy.
The last earthquake within about 200 km of this epicenter near Vancouver
Island with M>=5.6 occurred as an M 6.4 on July 11, 2024.
This epicenter is at 109 degrees from the M 6.3 in New Zealand two days ago
and joins a number of other expected events at this distance range from
New Zealand including the M 7.3 in Chiapas, Mexico and the M 5.5 in Central
Peru (see previous issues of this summary for details). When the earthquake
in New Zealand occurred this summary noted this possibility as:
"Today's earthquake map on this website shows nodal areas where likely seismic enhancement may
occur following the event in New Zealand. The distance at 103 degrees
is notable as it passes through active areas of California, Mexico and Peru
among others. It is likely that enhanced seismicity in those areas will
continue following today's event in New Zealand." (July 17, 2026)
It appears that today's earthquake in Vancouver may be third in this triad
of events (noted as possibly in California) in the forecast above.
At the time of the M 6.4 of July 11, 2024 this summary noted:
"The strongest earthquake in the world today was an M 6.4 in the series in Vancouver
Island, British Columbia which began July 4, 2024. NEIC reported it was lightly
felt with moderate intensity up to IV in Tofino, Canada. EMSC reported light
shaking in Chilliwack, Canada. Several moderate aftershocks - including
an M 5.4 - were also felt in this region. This summary has extensively
covered this swarm in previous issues as in the last summary which noted:
"This epicenter (in Mindanao, Philippines) is near 100 degrees from the M 6.7 yesterday south of Africa and at the
same distance from the continuing swarm of earthquakes in the Vancouver Island
area of British Columbia, Canada. With an earthquake at this depth these
areas are at the shadow zone boundary for S- and P-waves (normally 102-103 degrees
distance for earthquakes that occur near the surface. Thus the event today
in Mindanao is considered a triggered earthquake from the M 6.7 South of Africa
yesterday. Further activity (perhaps) a strong earthquake in Vancouver is
also likely at this time due to the concentration of energy from the area
south of Africa. A further complication perhaps leading to additional
enhancement in Vancouver, B.C. is the track of Hurricane Beryl. The remnants
Hurricane Beryl is now located over the northeastern U.S. where it has dropped
large reserves of water over the past two days. This summary has long been
a proponent of the theory that effects of strong meteorological events
(nor'easters and hurricanes, for example) affecting the Northeast U.S.
can trigger strong earthquakes on the Pacific-North American plate boundary
in particular from California north to Alaska. ..." (July 11, 2024)
In addition to being at 109 degrees from New Zealand, and at the sixth node (60 degrees) from Honshu, Japan this epicenter in Vancouver
is at the eighth node (45 degrees) from Chiapas, Mexico and had been
identified in the far-field forecast from Chiapas in this summary as possible at:
"Node 8 (45 degrees)
Eastern Mexico to Vancouver," (July 17-18, 2026)
O: 01AUG2026 04:49:01 49.6N 129.4W MW=5.6 EMSC VANCOUVER ISLAND, CANADA REGIO
NEIC reported an smaller regional foreshock of M 4.1 in Vancouver, Canada was felt with intensity up to II-III in the area(s) of Vancouver, Canada in British Columbia at Cowichan Valley and Victoria.
O: 31JUL2026 05:45:57 51.0N 125.5W ML=3.9 EMSC VANCOUVER ISLAND, CANADA REGIO
Moderate aftershocks continued today in the region of Kyushu, Japan but no aftershocks of M>=5 occurred.
Tolls continued to rise as rescue teams combed the area and sifted through
debris of collapsed structures and a mall. Those dead now exceed 30 but this is
expected to rise as workers continue rescue operations.
The events in Kyushu are at 102 degrees from the eye of Hurricane
Genevieve in the North Pacific off Mexico when the mainshock occurred. It is likely it was promoted
by energy from that powerful source. Two other moderate earthquakes
in the South Atlantic Ridge also occurred at 102 degrees from Hurricane
Genevieve in the past two days.
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026. The strongest event
in the area today was an M 5.0 in Guatemala. This earthquake in Guatemala
was reported by NEIC to have been felt with intensity IV in Guatemala at
Guatemala City, Puelbo Nuevo Vinas, Villa Nueva, Chimaltenango, San Marcos la Laguna, Solola, Antigua Guatemala, San Juan la Laguna, Jocotenango and Panajachel and in San Salvador, El Salvador.
EMSC reported strong shaking in Guatemala at Yepocapa, Palin, Antigua Guatemala, Villa Nueva, Petapa, San Pedro La Laguna, San Pablo Jocopilas, Mixco, Fraijanes, Solola, Santa Catarina Pinula, Chinautla, San Raimundo, Guatemala City, Cantel, Quetzaltenango, San Marcos and in El Salvador at Acjutla and Santa Tecla.
This epicenter is sub-solar on this day in July.
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 31JUL2026 10:18:07 13.9N 93.2W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 31JUL2026 09:40:08 14.0N 93.3W mb=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 31JUL2026 15:32:08 14.1N 93.5W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 31JUL2026 19:35:45 14.1N 93.6W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 01AUG2026 05:22:26 14.2N 93.6W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 31JUL2026 19:29:52 14.2N 93.6W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 31JUL2026 19:37:34 14.2N 93.6W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 31JUL2026 20:59:14 14.2N 93.4W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 31JUL2026 17:37:50 14.3N 93.6W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 31JUL2026 16:15:57 14.4N 93.3W mb=5.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 01AUG2026 08:21:49 14.6N 93.3W mb=4.6 EMSC OFFSHORE CHIAPAS, MEXICO
O: 31JUL2026 20:19:34 14.6N 94.0W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 31JUL2026 21:20:32 15.0N 93.0W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 31JUL2026 19:57:27 15.1N 93.0W mb=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 31JUL2026 10:49:14 15.5N 93.5W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 01AUG2026 04:56:50 16.8N 93.8W ML=4.0 EMSC CHIAPAS, MEXICO
O: 31JUL2026 12:49:43 16.8N 93.7W ML=4.1 EMSC CHIAPAS, MEXICO
O: 31JUL2026 09:16:24 14.0N 92.9W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 31JUL2026 22:01:05 13.9N 93.1W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
NEIC reported an earthquake of M 4.8 in northern Iran was felt with intensity up to II-III in the area(s) of northern Iran in Semnan, Iran at Emamshahr, Damghan.
It occurred within minutes of local solar noon and may have been promoted
by tidal stresses with the full moon of July 29 (see above).
A second earthquake a day later of M 4.6 occurred about 100 km southwest of
the initial M 4.8 in Iran. It also occurred within minutes of local solar noon.
This activity is at the sixth node (60 degrees) from Kyushu and at the third
node (120 degrees from Hurricane Genevieve and Chiapas, Mexico as well as
at the fourth node from Super-Typhoon Dolphin and may have been promoted
by energy from those sources as well.
O: 31JUL2026 09:08:55 36.2N 53.9E MB=4.6 EMSC NORTHERN IRAN
NEIC reported an earthquake of M 4.6 in Mindanao, Philippines was felt with intensity up to II-III in the area(s) of Mindanao, Philippines in the area of Daliao.
O: 31JUL2026 17:44:16 4.3N 127.0E ML=4.0 EMSC KEPULAUAN TALAUD, INDONESIA
O: 31JUL2026 21:23:58 4.9N 126.5E MB=4.4 EMSC KEPULAUAN TALAUD, INDONESIA
O: 01AUG2026 03:42:50 5.6N 124.9E MB=4.6 EMSC MINDANAO, PHILIPPINES
NEIC reported an earthquake of M 4.9 in South Island, New Zealand was felt with intensity up to II-III in the area(s) of South Island, New Zealand in Te Anau, Queenstown, Riverton, Invercargill, Wanaka, Otago, Cromwell and Gore, Southland.
O: 01AUG2026 03:23:55 45.1S 167.5E MB=4.9 EMSC SOUTH ISLAND OF NEW ZEALAND
NEIC reported an earthquake of M 5.5 in Hokkaido, Japan was felt with intensity up to II-III in the area(s) of Hokkaido, Japan with IV in Misawa, Aomori and II-III in Hachinohe, Hakodate and Sapporo, Hokkaido.
O: 01AUG2026 02:48:00 41.3N 141.9E MW=5.5 EMSC HOKKAIDO, JAPAN REGION
NEIC reported an earthquake of M 4.7 in Southern Italy was felt with intensity up to II-III in the area(s) of Southern Italy with V in Campania, Italy at Pozzuoli, Bacoli, Naples and II-III in Sorrento, Volla, Ischia.
EMSC reported strong shaking in Italy was felt with the mainshock at Bagnoli, Posillipo, Fuorigrotta, Quarto, Chiaia, Chiaiano, Vomero, Avvocata, Castello Monteleone, Stella, San Lorenzo, Miano, Festinese, Villaricca, Grumo Nevano, Carinaro, Afragola, Badia, Sulmona, Taranto and Colle della Torre.
EMSC reported the M 3.8 aftershock was felt stronly in Italy at Posillipo, Monte di Procida, Fuorigrotta, Castello Monteleone, Chiaiano, Chiaia, Vomero, Arenella, Naples, Portici, Sulmona.
The last earthquake in southern Italy with a shallow focal depth and M>=4.7
within about 100 km of this epicenter occurred as an M 4.7 on March 28, 2023
but the last of larger magnitude was an M 5.2 on December 29, 2013 so today's
event is regionally significant and may be related to growing volcanism
in the area of Naples, Italy. At the time of the March, 2023 event this
summary noted:
" ... a moderate earthquake of M 4.7 was widely felt in southern Italy today. NEIC reported maximum intensity VII in Molise, Italy at Limosano and V in Mafalda and Ferrazzano, and IV in Campobasso, M<iranda, and in Vasto Abruzzen and Benevento, Campania with lesser shaking in Agone, Moise and Guardia Campania.
No major damage was associated with today's Italian earthquake. This is the largest earthquake in Southern Italy within about 150 km of this
epicenter since an M 5.3 on August 16, 2018. At the time this summary noted
in this regard:
"An earthquake of M 5.3 in southern Italy today continued the moderate quakes in that area.
No major damage has been associated with these events over the past several days.
Today's M 5.3 was reported in Abruzzen, Italy at Sal Salvo, and San Vito Chietino and IV in Torrevecchia Teatina, Lentella, Campomarino, Casalbordino, with intensity II-III in Agnone, Molise; San Severo, Apulien, and in Abruzzen at Campo de Giove and Pescara and in general within about 150 km of the epicenter." (August 16, 2018, March 29, 2023)
O: 31JUL2026 17:46:43 40.8N 14.2E ML=4.7 EMSC SOUTHERN ITALY
O: 31JUL2026 20:00:09 40.8N 14.1E MD=3.8 EMSC SOUTHERN ITALY
NEIC reported an earthquake of M 4.5 in Cook Strait, New Zealand was felt with intensity up to II-III in the area(s) of Cook Strait, New Zealand near Titahi Bay.
EMSC reported it was felt and heard in Kelburn, New Zealand.
GeoNet reported the following data for this event:
This epicenter is at 101 degrees from Chiapas, Mexico and was likely
promoted by energy from that source.
O: 31JUL2026 11:09:22 41.0S 174.5E ML=4.6 GEONET Felt with moderate intensity in the area of Southern North Island, New Zealand and northern South Island. 8971 reports of felt events were made of which 4731 reported weak and 3760 light intensity with 454 reports of moderate shaking and 13 with strong and 4 severe and 9 with extreme intensity came from the area.
O: 31JUL2026 11:09:20 41.0S 174.5E MB=4.5 EMSC COOK STRAIT, NEW ZEALAND
EMSC reported an earthquake of M 4.3 in Costa Rica was felt with intensity up to IV in the area(s) of in Costa Rica with a loud boom in Paraiso, San Pedro, and lighter shaking in Guadalupe, Alajuelita, Angeles, San Padro, San JosecitoLa Asuncion, Santa Ana, Daniel Flores, Santo Domingo, Carrillos, Colon and Barrio Jesus.
O: 01AUG2026 02:16:27 9.7N 83.8W MB=4.3 EMSC COSTA RICA
EMSC reported an earthquake of M 4.4 in Tajikistan was felt with intensity up to IV in the area(s) of Tajikistan in Dushanbe.
O: 31JUL2026 20:26:49 37.8N 69.8E MB=4.4 EMSC TAJIKISTAN
EMSC reported an earthquake of M 2.9 in Southern California was felt with intensity up to IV in the area(s) of Southern California at Valley Center with a big noise, Bonsall, San Marcos, Escondido, Murrieta Hot Springs, Sun City, Quail Valley, Cathedral City and Desert View Highlands.
Today's event occurred within minutes of local solar noon and may have been
promoted by tidal and/or geomagnetic stresses.
This epicenter in southern California is at the fourth node (90 degrees)
from Kyushu, Japan and may have been promoted by energy from that source.
O: 31JUL2026 20:10:14 33.4N 117.0W ML=2.9 EMSC SOUTHERN CALIFORNIA
O: 31JUL2026 16:49:04 33.2N 116.4W ML=2.0 EMSC SOUTHERN CALIFORNIA
EMSC reported an earthquake of M 5.0 in Coquimbo was felt with intensity up to IV in the area(s) of Chile at La Serena, Coquimbo, Vicuna, and in Santiago and Las Heras, Argentina.
This event occurred less than 30 seconds after an M 4.7 in Italy
(see above) and a light to moderate events of M 3.2 an M 4.0 in the Talaud Islands.
This event occurred near local solar noon and may have been promoted by
tidal and/or geomagnetic stresses which maximize near this hour.
O: 31JUL2026 17:47:05 29.9S 72.1W MW=5.0 EMSC OFFSHORE COQUIMBO, CHILE
O: 31JUL2026 17:44:16 4.3N 127.0E ML=4.0 EMSC KEPULAUAN TALAUD, INDONESIA
O: 31JUL2026 21:23:58 4.9N 126.5E MB=4.4 EMSC KEPULAUAN TALAUD, INDONESIA
O: 01AUG2026 03:42:50 5.6N 124.9E MB=4.6 EMSC MINDANAO, PHILIPPINES
O: 31JUL2026 17:46:43 40.8N 14.2E ML=4.7 EMSC SOUTHERN ITALY
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
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STYP DOLPHIN 2026-08-01 00:00 UT 20.4N 166.7E 155 kts North-central Pacific
Super-Typhoon Dolphin (TD 12W) continued today in the north-central Pacific with winds up to 155 kts. It is expected to track to the west but little seismic enhancement is expected in this area at this time. It will then track towards the Mariana Islands. Enhanced seismicity will depend on the path. This could encounter southern Honshu Japan as a major typhoon in early August. It could pose a significant threat to Japanese seismicity as it makes landfall. The antipode is at 20S 28W in the South Atlantic Ridge area could see enhanced seismicity at this time.
HURRICANE GENEVIEVE (07E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR GENEVIEVE 2026-08-01 00:00 UT 22.4N 131.4W 60 kts West of Mexico
Hurricane Genevieve continued today West of Mexico with winds up to 60 kts. It is expected to track to the west but is unlikely to significantly affect regional seismicity at this time. The antipode at 23S 40E is not a seismic area.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 31, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
800 0121 0129 0137 C1.8 (July 31, 2026) 1.7E-03
Greenland M 3.6 01:33 UT
810 0231 0239 0248 C2.3 (July 31, 2026) 2.3E-03
820 0305 0316 0330 C3.1 (July 31, 2026) 4.3E-03
840 0641 0647 0710 C2.4 (July 31, 2026) 3.7E-03
850 0825 0834 0841 C1.4 (July 31, 2026) 1.3E-03
Sumatra M 4.9 08:31 UT
870 1109 1119 1129 C2.3 (July 31, 2026) 2.4E-03
India M 3.5 11:17 UT
880 1136 1141 1143 C2.5 (July 31, 2026) 1.9E-03
910 1143 1147 1156 C3.9 (July 31, 2026) 2.9E-03
890 1347 1357 1404 C1.7 (July 31, 2026) 1.5E-03
Quebec M 3.1 14:08 UT
Valparaiso M 4.0 14:04 UT
900 1803 1813 1824 C1.6 (July 31, 2026) 1.8E-03
South of Java M 3.6 18:38 UT
Washington M 2.6 18:14 UT 18:18 M 2.2
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: quiet August 1 major storms August 2 active August 3. Solar M-flare chance: 30% X-class: 1% proton storm: 1%
AP Indicies: global: 5, high: 3, mid-latitude: 7, time of max k: 11:00-13:00 UT; Max k: 3 Global Kp 2.00 1200-1400, July 31; Sunspot Number: 123; Radio Flux: 148
A proton storm commenced on July 30, 2026 at 17:30 UT. It continued at 10MeV warning levels
or higher through the first half of July 31. This is the first measurable
proton storm since July 4, 2026 but that storm did not exceed the SWPC 10 MeV warning threshold.
The last storm to do that occurred on May 27-28, 2026 and was about the same
intensity as today's. This storm has now diminished but is still active.
A strong excursion in the strength of the geomagnetic field at GOES 19 satellite magnetometer was
recorded on July 31 starting near 02:35 UT. An earthquake of M 3.6 was recorded in Honshu, Japan at 02:40 UT
within minutes of local solar noon. The two events may be related. An arcjet maneuver was performed on GOES-19 at 02:35 UT
and normal orbit returned with the end of the arcjet at 04:00 UT July 31.
A second strong excursion in the GOES-18 geomagnetic field strength was
recorde starting near 18:00 UT on July 31. An arcjet maneuver stabilized
the orbit and normal operations resumbed by 20:00 UT.
The Hp30 (GFZ) index did not exceed 3 in the past 24 hours.
July 31, 2026
Notable earthquakes and events:
A proton storm commenced on July 30, 2026 at 17:30 UT and reached its maximum intensity at high energy levels around 18:00 UT. It continued at 10MeV warning levels
or higher through the first half of July 31. This is the first measurable
proton storm since July 4, 2026 but that storm did not exceed the SWPC 10 MeV warning threshold.
The last storm to do that occurred on May 27-28, 2026 and was about the same
intensity as today's. Today's proton storm occurred at the same time as
an M2.0 solar flare but may not be related to that flare as it takes time
for solar protons to arrive in the vicinity of the earth. A series of earthquakes
did occur during the solar flare and at the commencement of the proton storm
however. These included the strongest earthquake of the day - an M 5.9 in the State
of Yap, Micronesia at the time the storm maximized. It is likely this
earthquake in Micronesia was triggered by the proton storm.
Other earthquakes near the proton storm commencement occurred as an M 2.3 felt
in Los Angeles, California and events of M 5.2 in the Kermadec Islands swarm
and of M 4.3 in western Xizang, China.
O: 30JUL2026 17:55:59 11.6N 139.9E MB=5.9 EMSC STATE OF YAP, MICRONESIA
O: 30JUL2026 17:48:12 31.5S 177.9W MB=5.2 EMSC KERMADEC ISLANDS REGION
NEIC reported this earthquake in Micronesia may have been felt lightly in Colonia, Micronesia.
The last earthquake near Yap, Micronesia of M>=5.9 occurred in the middle of
a strong proton storm, larger than today's as well on February 14, 2024 with M 6.0.
The strongest earthquake in the area of Yap in the past 25 years occurred
on August 13-14, 2010 with M 6.9 and with a strong series of aftershocks.
These events occurred during a strong proton storm that exceeded the SWPC 10 MeV warning
threshold as well. As strong proton storms are unusual, this may be significant in terms of
seismic triggering in the area.
This earthquake in Yap, Micronesia may also have been promoted by the M1.9
solar flare which peaked near the time of this event. This flare began
when Yap was near local solar midnight and when this latitude in Micronesia
was nearly sub-solar on this date in July. Data on this flare from
SWPC follow.
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
770 1553 1700 1800 M1.9 (July 30, 2026) 5.7E-02 *
Chiapas M 4.3 16:05 UT
Peru M 4.3 16:15 UT
Honshu M 4.3 16:20 UT
Taiwan M 4.5 16:58 UT
Kermadec Is. M 5.2 17:48 UT
Los Angeles M 2.3 17:44 UT
Yap, Micronesia M 5.9 17:55 UT
This epicenter in Yap, Micronesia is at the 16th node (think half of the
eighth node of 45 degrees) at 22.5 degrees from Super-typhoon Dolphin
and Kyushu, Japan and at the fourth node (90 degrees) from Hurricane Genevieve; at the
third node (120 degrees) from Chiapas and at 144 degrees from Venezuela
and was likely promoted by energy from those sources.
O: 30JUL2026 17:55:59 11.6N 139.9E MB=5.9 EMSC STATE OF YAP, MICRONESIA
A moderately strong earthquake of M 5.6 also occurred today in central Peru.
NEIC reported it was felt with intensity III in Peru at Oxapampa, Pasco and Pucallpa, Ucayali and II in Lima and San Luis.
EMSC reported moderate shaking in Peru at Oxapampa, Huarmey, La Molina, Lima, Carmen De La Reynoso, San Isidro, Santiago de Surco, and Mala.
This epicenter was at local solar noon when the M1.9 solar flare peaked at
17:00 UT on July 30 and may have been promoted by SFE associated with that
flare (see above).
This epicenter is at the sixth node (60 degrees) from Hurricane Genevieve and at 146
degrees from Kyushu and 103 degrees from New Zealand and may have been
promoted by energy from those sources.
O: 31JUL2026 00:58:45 8.3S 74.2W MW=5.6 EMSC CENTRAL PERU
A strong excursion in the strength of the geomagnetic field at GOES 19 satellite magnetometer was
recorded on July 31 starting near 02:35 UT. An earthquake of M 3.6 was recorded in Honshu, Japan at 02:40 UT
within minutes of local solar noon. The two events may be related. An arcjet maneuver was performed on GOES-19 at 02:35 UT
and normal orbit returned with the end of the arcjet at 04:00 UT July 31.
Like the earthquake in the Antarctic (see previous issues) earthquakes today in
Papua, Indonesia are at 102 degrees from Hurricane Genevieve. It is also at
the 10th node from Kyushu (36 degrees) and may have been promoted by energy
from that source. It is located at the longitude of maximum stress
with the full moon of July 29, 2026 and was likely promoted by strong
tidal stresses with that alignment. Activity following strong events
in Kyushu, Japan tends to concentrate in Papua and in New Britain and New
Ireland in the several days after - as well as in the Kermadec Islands
and the Antarctic-Pacific Ridge and these areas are likely to continued
to see elevated seismicity at this time.
O: 30JUL2026 08:16:13 2.2S 139.0E ML=4.3 EMSC PAPUA, INDONESIA
O: 30JUL2026 08:19:05 2.3S 139.0E ML=4.4 EMSC PAPUA, INDONESIA
O: 30JUL2026 13:21:53 2.4S 138.8E ML=4.0 EMSC PAPUA, INDONESIA
O: 30JUL2026 14:37:35 2.7S 138.9E mb=4.4 EMSC PAPUA, INDONESIA
O: 30JUL2026 08:21:22 3.5S 140.4E ML=4.0 EMSC PAPUA, INDONESIA
O: 30JUL2026 08:23:48 2.1S 138.9E ML=4.1 EMSC PAPUA, INDONESIA
The full moon arrived on July 29, 2026 at 14:36 UT. Longitudes which are at local solar midnight at this hour are near 140E while those at local solar noon are near 40W. These include in the east areas of Japan and the Philippines north to Kamchatka and eastern Indonesia and China and in the west, the Central Atlantic Ridges, portions of South America and Iceland. These are the areas most likely to see tidal triggering in the next week. They include some areas where strong or unusual earthquakes occur and the likelihood of such an event, especially near 135E is considered highly likely in this time frame.
This is the last full moon before the solar eclipse of
August 12, 2026. Often areas which will see enhanced seismicity at the time
of solar eclipses see a foretaste with the prior full moon. An earthquake of M 4.9 accompanied
the full moon at 14:36 UT (exactly at the peak of the full moon - see above)
in the area of Valparaiso Chile with the following EMSC parameters:
Moderate to strong aftershocks continued today in the region of Kyushu, Japan.
Tolls continued to rise as rescue teams combed the area and sifted through
debris of collapsed structures and a mall. Those dead now exceed 6 but this is
expected to rise.
The events in Kyushu are at 102 degrees from the eye of Hurricane
Genevieve in the North Pacific off Mexico when the mainshock occurred. It is likely it was promoted
by energy from that powerful source. Two other moderate earthquakes
in the South Atlantic Ridge also occurred at 102 degrees from Hurricane
Genevieve in the past two days.
O: 30JUL2026 13:47:39 32.7N 130.7E MB=5.0 EMSC KYUSHU, JAPAN
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026. The strongest event
in the area today was an M 5.0 in Guatemala. This earthquake in Guatemala
was reported by NEIC to have been felt with intensity IV in Guatemala at
Guatemala City, Puelbo Nuevo Vinas, Villa Nueva, Chimaltenango, San Marcos la Laguna, Solola, Antigua Guatemala, San Juan la Laguna, Jocotenango and Panajachel and in San Salvador, El Salvador.
EMSC reported strong shaking in Guatemala at Yepocapa, Palin, Antigua Guatemala, Villa Nueva, Petapa, San Pedro La Laguna, San Pablo Jocopilas, Mixco, Fraijanes, Solola, Santa Catarina Pinula, Chinautla, San Raimundo, Guatemala City, Cantel, Quetzaltenango, San Marcos and in El Salvador at Acjutla and Santa Tecla.
This epicenter is sub-solar on this day in July.
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 30JUL2026 11:25:44 13.9N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 30JUL2026 10:27:02 14.0N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 30JUL2026 18:31:14 14.0N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 30JUL2026 19:17:34 14.0N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 30JUL2026 21:18:53 14.0N 93.4W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 30JUL2026 14:45:25 14.1N 92.9W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 30JUL2026 15:28:48 14.1N 93.6W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 30JUL2026 22:52:48 14.1N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 30JUL2026 06:58:53 14.2N 91.0W Mw=5.0 EMSC GUATEMALA
O: 30JUL2026 09:23:27 14.2N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 30JUL2026 15:10:18 14.2N 93.6W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 30JUL2026 16:05:12 14.2N 93.6W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 30JUL2026 08:35:53 14.3N 92.8W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 30JUL2026 20:33:37 14.3N 93.3W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 30JUL2026 18:20:36 14.4N 92.8W Mw=4.9 EMSC OFFSHORE CHIAPAS, MEXICO
O: 30JUL2026 20:49:12 14.4N 93.5W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 30JUL2026 09:11:02 14.9N 93.1W ML=3.8 EMSC OFFSHORE CHIAPAS, MEXICO
O: 30JUL2026 23:42:35 14.9N 93.5W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
The strong series of earthquakes continued today in the area of the northern
Kermadec Islands. This included three events of M 5.0 which were unfelt today.
The Kermadec Islands often is activated following strong earthquakes in
Kyushu, Japan and is located at the fifth node (51 degrees) from Super-Typhoon
Dolphin and at the fourth node (90 degrees) from Chiapas, Mexico and
may have been promoted by energy from those sources.
O: 30JUL2026 20:26:36 28.6S 176.6W MB=5.0 EMSC KERMADEC ISLANDS REGION
O: 31JUL2026 02:07:56 28.6S 177.0W mb=4.6 EMSC KERMADEC ISLANDS REGION
O: 31JUL2026 04:02:51 28.7S 176.5W mb=5.0 EMSC KERMADEC ISLANDS REGION
O: 31JUL2026 06:30:27 28.9S 176.7W mb=5.0 EMSC KERMADEC ISLANDS REGION
NEIC reported an earthquake of M 4.1 in Vancouver, Canada was felt with intensity up to II-III in the area(s) of Vancouver, Canada in British Columbia at Cowichan Valley and Victoria.
O: 31JUL2026 05:45:57 51.0N 125.5W ML=3.9 EMSC VANCOUVER ISLAND, CANADA REGIO
NEIC reported an earthquake of M 2.7 in Nevada was felt with intensity up to II-III in the area(s) of Nevada in Las Vegas.
O: 31JUL2026 02:21:20 37.2N 114.8W ML=2.7 EMSC NEVADA
NEIC reported an earthquake of M 3.4 in Mammoth Lakes, California was felt with intensity up to II-III in the area(s) of Mammoth Lakes, California with III in June Lake, Groveland, Arnold, Bishop, II in Mammoth Lakes, Sanger and in Glenbrook, Nevada.
O: 30JUL2026 15:34:57 37.5N 118.8W ML=3.1 EMSC CENTRAL CALIFORNIA
O: 30JUL2026 15:34:57 37.5N 118.8W ML=3.4 NEIC CENTRAL CALIFORNIA
EMSC and NEIC reported an earthquake of M 4.2 in Iraq was felt with intensity up to II-III in the area(s) of Iraq with V in Kirkuk at-Ta'mim.
O: 30JUL2026 14:58:27 35.3N 44.5E MB=4.2 EMSC IRAQ
O: 31JUL2026 04:49:37 34.5N 44.3E mb=4.0 EMSC IRAQ
NEIC reported an earthquake of M 4.8 in northern Iran was felt with intensity up to II-III in the area(s) of northern Iran in Semnan, Iran at Emamshahr, Damghan.
It occurred within minutes of local solar noon and may have been promoted
by tidal stresses with the full moon of July 29 (see above).
A second earthquake a day later of M 4.6 occurred about 100 km southwest of
the initial M 4.8 in Iran. It also occurred within minutes of local solar noon.
This activity is at the sixth node (60 degrees) from Kyushu and at the third
node (120 degrees from Hurricane Genevieve and Chiapas, Mexico as well as
at the fourth node from Super-Typhoon Dolphin and may have been promoted
by energy from those sources as well.
O: 30JUL2026 08:07:14 36.7N 54.9E MB=4.8 EMSC NORTHERN IRAN
O: 31JUL2026 09:08:55 36.2N 53.9E MB=4.6 EMSC NORTHERN IRAN
NEIC reported earthquakes of M 2.3 and M 2.4 in Los Angeles, California were felt with intensity up to II-III in the area(s) of Los Angeles at Hawaiian Gardens, Lakewood, La Palma, Long Beach, Signal Hill.
EMSC reported light quick jolts in California at Los Alamitos, Rossmoor, Artesia, Ladera Heights, Lakewood, Signal Hill, Bellflower, Paramount, Midway City, Huntington Beach.
O: 30JUL2026 17:44:33 33.8N 118.1W ML=2.3 EMSC GREATER LOS ANGELES AREA, CALI
O: 30JUL2026 09:36:30 33.8N 118.1W ML=2.4 EMSC GREATER LOS ANGELES AREA, CALIF.
NEIC reported an earthquake of M in was felt with intensity up to II-III in the area(s) of
NEIC reported an earthquake of M in was felt with intensity up to II-III in the area(s) of
EMSC reported earthquakes of M 5.1 and M 4.7 in Kamchatka were felt with intensity up to IV in the area(s) of Kamchatka at Petropavlovsk-Kamchatsky, and Paratunka.
O: 30JUL2026 21:53:25 53.0N 159.5E MB=5.1 EMSC NEAR EAST COAST OF KAMCHATKA
O: 30JUL2026 22:24:47 53.0N 159.8E mb=4.7 EMSC NEAR EAST COAST OF KAMCHATKA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP DOLPHIN 2026-07-31 00:00 UT 16.4N 162.7E 170 kts North-central Pacific
Super-Typhoon Dolphin (TD 12W) continued today in the north-central Pacific with winds up to 170 kts. It is expected to track to the west but little seismic enhancement is expected in this area at this time. It will then track towards the Mariana Islands reaching super-typhoon intensity with winds up to 180 kts around July 31 to August 1. Enhanced seismicity will depend on the path. This could encounter Honshu Japan as a major typhoon in early August and is likely to remain in the super-typhoon category for at least a week due to the unusually warm waters of the Pacific during the current super-El Nino event. It could pose a significant threat to Japanese seismicity as it makes landfall. The antipode is at 18S 18W in the South Atlantic Ridge area could see enhanced seismicity at this time as a moderate earthquake occurred near that epicenter two days ago.
HURRICANE GENEVIEVE (07E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR GENEVIEVE 2026-07-31 00:00 UT 21.4N 126.4W 70 kts West of Mexico
Hurricane Genevieve continued today West of Mexico with winds up to 70 kts (Category 3 hurricane). It is expected to track to the west but is unlikely to significantly affect regional seismicity at this time and to dissipate in the North Pacific around August 5. The antipode at 22S 54E is near the South Indian Ridge system - a seismic area in the South Indian Ocean where some enhanced seismicity may occur antipodally to Genevieve at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 27, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
750 0544 0606 0628 C3.8 (July 30, 2026) 7.6E-03
Southwest Indian Ridge M 4.7 05:46 UT
Myanmar M 3.7 06:18 UT
Tarapaca M 4.6 06:04 UT
Papua M 4.7 05:55 UT
Guatemala M 5.0 06:58 UT
770 1553 1700 1800 M1.9 (July 30, 2026) 5.7E-02 *
Chiapas M 4.3 16:05 UT
Peru M 4.3 16:15 UT
Honshu M 4.3 16:20 UT
Taiwan M 4.5 16:58 UT
Kermadec Is. M 5.2 17:48 UT
Los Angeles M 2.3 17:44 UT
Yap, Micronesia M 5.9 17:55 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active July 31 through August 1 quiet August 2. Solar M-flare chance: 25% X-class: 1% proton storm: 1%
AP Indicies: global: 5, high: 4, mid-latitude: 8, time of max k: 11:00-13:00 UT; Max k: 3 Global Kp 2.00 1000-1400, July 30; Sunspot Number: 130; Radio Flux: 152
A proton storm commenced on July 30, 2026 at 17:30 UT. It continued at 10MeV warning levels
or higher through the first half of July 31. This is the first measurable
proton storm since July 4, 2026 but that storm did not exceed the SWPC 10 MeV warning threshold.
The last storm to do that occurred on May 27-28, 2026 and was about the same
intensity as today's.
A strong excursion in the strength of the geomagnetic field at GOES 19 satellite magnetometer was
recorded on July 31 starting near 02:35 UT. An earthquake of M 3.6 was recorded in Honshu, Japan at 02:40 UT
within minutes of local solar noon. The two events may be related. An arcjet maneuver was performed on GOES-19 at 02:35 UT
and normal orbit returned with the end of the arcjet at 04:00 UT July 31.
The Hp30 (GFZ) index did not exceed 3 in the past 24 hours.
July 30, 2026
Notable earthquakes and events:
A series of moderately large to large earthquakes have occurred since the last
issue of this summary. Much of this activity occurred as a consequence of
tidal stresses with the full moon as has been previously reported in this
summary. But a series of moderately large earthquakes appear to have
helped trigger the next. This pattern began when an M 5.6 occurred near
local solar noon in the Pacific-Antarctic Ridge. The last earthquake
with M>=5.6 within about 300 km of this epicenter was an M 5.6 on April 3, 2025.
At the time this summary noted:
"The strongest earthquake in the world today was an M 6.2 (EMSC) to 6.4 (BGS) in Kyushu, Japan. NEIC reported it was felt with intensity VI in Kanoya, Kagoshima, Japan; V in Miyazaki and II-III in Kumamoto, Oita and Chiba Prefectures.
No tsunami was observed or expected. This is the strongest earthquake in the
Kyushu area of Japan within about 200 km of this epicenter since an M 6.8 on January 13, 2025
and is the largest aftershock to date of that event.
...
An earthquake of M 5.6 occurred today south of New Zealand in the Balleny Islands. It was not reported felt in this remote area.
The last earthquake within about 250 km of today's epicenter in the Balleny Islands
with M>=5.6 occurred as an M 5.8 on December 28, 2023. When an M 5.6 hit the
area on January 3, 2023 this summary noted:
"The only earthquake with M>=5.8 within about 400 km of this epicenter in the past 15 years was an
M 6.0 on February 2, 2018. A series of events in this area of M 5.8 on Marcy 9, 2004 and July 16, 2004 (M 6.1)
also occurred in the past 35 years. Similar events of M 5.8 hit the area on September 23, 1997 and September 9, 1998.
At the time of the M 6.0 on February 2, 2018, this summary noted in this regard:
"A strong M 6.0 earthquake under Scott Island Bank, Antarctica today was
followed by an aftershock of M 5.2 more than an hour later. These events were
not reported felt in this remote area. They occurred within about 30 minutes
of local solar midnight and were probably related to high tidal stresses associated
with the full moon of January 31. The timing in mid-summer on or near the Scott
Ice Cap also suggests they may have been related to a glacial sea-ice calving
event in the area, but this is not confirmed. At the least, they may open
cracks in the ice which can destabilize it. Earthquakes in this area of Antarctica
are rare. The last with M>=6 within about 500 km of this epicenter occurred
on December 24, 2010 (M 6.0)." (February 2, 2018, April 3, 2025)
Note the coincidence between the quake in Kyushu and that in the Pacific-Antarctic
Ridge of April 2, 2025 - precisely the same combination as those events today.
This may be due to the strong distance energy concentration between these
two areas which lie at 104 degrees apart, a distance at which strong
far-field seismic triggering is often seen following major earthquakes and
other surface phenomena. This epicenter in Antarctica is also at 102 degrees
from Chiapas and may have been promoted by constructive interference
of energy from those two sources.
O: 29JUL2026 22:08:08 65.3S 179.5W MB=5.6 EMSC PACIFIC-ANTARCTIC RIDGE
The M 5.6 in the Pacific-Antarctic Ridge was followed 20 minutes later by an M 5.9
in the Kermadec Islands, New Zealand region at a distance of 37 degrees.
Surface waves from Antarctica would have been in the area of the Kermadec
Islands at that time and may have helped promote that subsequent event.
The event in the Kermadec Islands occurred near local solar noon and was
followed by aftershocks of M 5.2 and M 5.8 among others. The M 5.2
aftershock occurred 15 minutes after the mainshock and may have been
triggered by the returning ScS wave after reflection off the core.
These events in the Kermadec Islands are at the fifth node (72 degrees)
from Hurricane Genevieve and at the fourth node from Chiapas (90 degrees)
and may have been promoted by energy from those sources.
O: 29JUL2026 22:27:58 28.6S 176.6W MB=5.9 EMSC KERMADEC ISLANDS REGION
O: 29JUL2026 22:42:31 28.8S 176.6W MB=5.2 EMSC KERMADEC ISLANDS REGION
O: 30JUL2026 05:08:32 28.7S 176.5W MB=5.8 EMSC KERMADEC ISLANDS REGION
The M 5.8 aftershock may have been triggered by surface waves from an
M 5.4 in Papua, Indonesia which occurred 26 minutes earlier than the
event in Kermadec, the time for the surface waves to traverse this distance
of 50 degrees.
Like the earthquake in the Antarctic (see above) this earthquake in
Papua, Indonesia is at 102 degrees from Hurricane Genevieve. It is also at
the 10th node from Kyushu (36 degrees) and may have been promoted by energy
from that source. It is located at the longitude of maximum stress
with the full moon of July 29, 2026 and was likely promoted by strong
tidal stresses with that alignment.
O: 30JUL2026 08:23:48 2.1S 138.9E ML=4.1 EMSC PAPUA, INDONESIA
O: 30JUL2026 08:16:13 2.2S 139.0E ML=4.3 EMSC PAPUA, INDONESIA
O: 30JUL2026 08:19:05 2.3S 139.0E ML=4.4 EMSC PAPUA, INDONESIA
O: 30JUL2026 04:42:13 2.6S 138.8E mb=5.4 EMSC PAPUA, INDONESIA
O: 30JUL2026 05:55:54 2.6S 139.0E mb=4.7 EMSC PAPUA, INDONESIA
The full moon arrived on July 29, 2026 at 14:36 UT. Longitudes which are at local solar midnight at this hour are near 140E while those at local solar noon are near 40W. These include in the east areas of Japan and the Philippines north to Kamchatka and eastern Indonesia and China and in the west, the Central Atlantic Ridges, portions of South America and Iceland. These are the areas most likely to see tidal triggering in the next week. They include some areas where strong or unusual earthquakes occur and the likelihood of such an event, especially near 135E is considered highly likely in this time frame.
This is the last full moon before the solar eclipse of
August 12, 2026. Often areas which will see enhanced seismicity at the time
of solar eclipses see a foretaste with the prior full moon. An earthquake of M 4.9 accompanied
the full moon at 14:36 UT (exactly at the peak of the full moon - see above)
in the area of Valparaiso Chile with the following EMSC parameters:
O: 29JUL2026 14:36:52 33.3S 72.1W ML=4.9 EMSC OFFSHORE VALPARAISO, CHILE
O: 29JUL2026 14:37:59 33.3S 72.0W ML=4.2 EMSC OFFSHORE VALPARAISO, CHILE
This epicenter was near local solar noon at the time of this earthquake
and was probably promoted by strong tidal stresses with this full moon.
The mainshock was followed a minute later by and M 4.2 aftershock.
EMSC reported it was felt in Chile with moderate shaking at Villa Alemana.
NEIC reported intensity III in Valparaiso.
A moderate foreshock hit this area as reported in the previous issue of this
summary:
"NEIC reported an earthquake of M 4.1 in Valparaiso, Chile was felt with intensity up to II-III in the area(s) of Valparaiso, Chile in Santiago, and in O'Higgins at Rengo and Machali." (July 28, 2026)
This epicenter is located at 120.0 degrees (node 3) from the current location
of Super-Typhoon Dolphin and at the seventh node (51.4 degrees) from
Chiapas and may have been promoted by energy from those sources.
O: 29JUL2026 14:36:52 33.3S 72.1W ML=4.9 EMSC OFFSHORE VALPARAISO, CHILE
O: 29JUL2026 14:37:59 33.3S 72.0W ML=4.2 EMSC OFFSHORE VALPARAISO, CHILE
An earthquake of M 5.1 in Luzon, Philippines also occurred within minutes of
the completion of the full moon today. EMSC reported it was felt with moderate
shaking in Luzon at Antipolo, Calumpang, Cainta, Pasig City, Pateros, Manila and
Makati City. NEIC reported intensity III in the Philippines in Daet, Bicol, Malanday, Manila, Cainta, Niogan, Pililla, Southern Tagalog. This event occurred near local solar midnight at a latitude which
is near sub-solar (15 North latitude) on this date and was probably promoted
by tidal stresses with the full moon.
The last earthquake within about 150 km of this epicenter in the Philippines
with M>=5.1 was an M 5.3 on September 3, 2024. At the time this summary noted:
"NEIC reported this earthquake of M 5.3 in Luzon, Philippines was felt with intensity up to IV in the area(s) of Luzon, Philippines in Bicol at Daet and Basud and in Tagalog at Lucena, Palestina, Cainta, Taytay, Malanday, and in Manila and Mariveles, Luzon.
EMSC reported strong shaking in the central Philippines in Hondagua Lopez, Cainta, Quezon City, Taguig City, Antipolo, Bacoor and Paranaque City among others.
PHIVOLCS reported intensity V in Quezon at Jomalig and Polillo, IV in Quezon at Burdeos, Panukulan and Patnanungan and Camarines Norte at Parascale, Santa Elena and Vinzons and III in other areas of Quezon, Camarines Norte; City of Taguig and Pateros Quezon City. Lesser shaking was reported in Camarines Sur, City of Angels and the City of Caloocan and Pasig.
An aftershock of M 5.0 was reported by NEIC to have been felt with intensity II-III in the Philippines at Manila and in Taytay, Rizal, Tagalog.
It is likely that this activity was promoted by landfall in the region today of
Tropical Storm Yagi as proposed in previous issues of this summary" (September 3, 2024)
This epicenter is located at the eighth node (45 degrees) from Super-Typhoon Dolphin and at
the fifth node (72 degrees) from New Zealand and may have been promoted by
energy from those sources.
O: 29JUL2026 14:11:04 15.3N 122.8E MB=5.1 EMSC PHILIPPINE ISLANDS REGION
About an hour after the Luzon quake (see above) a second quake in Luzon
occurred about 300 km southeast of that epicenter in the Catanduanes region of the
Philippines. NEIC reported it was felt with intensity IV in Bicol Philippines at Bato and II in Gandara. Earthquakes of M 5.3 in Kyushu, Japan and M 5.0 and M 5.1 in Mindanao
preceded the completion of the full moon about an hour earlier and may have
been promoted by tidal stresses. All of these events occurred within about
an hour of local solar midnight. A similarly timed M 5.4 in Kyushu was the second strongest
aftershock in the area at this writing. NEIC reported this earthquake
was felt with intensity II in Japan at Isahaya, Nagasaki, Ibaraki, Osaka and Kogoshima.
O: 29JUL2026 15:10:02 13.1N 124.6E MB=5.4 EMSC PHILIPPINE ISLANDS REGION
The earthquakes in Mindanao were reported by NEIC to have been felt with intensity
IV in Southern Mindanao at Buayan, San Jose, Conel, Katangawan, Padada, Klinan, Digos and II in Manado, Sulawesi, Indonesia.
O: 29JUL2026 13:23:55 5.3N 125.1E MB=5.1 EMSC MINDANAO, PHILIPPINE ISLANDS REGION
O: 29JUL2026 13:16:59 5.5N 125.4E MB=5.0 EMSC MINDANAO, PHILIPPINE ISLANDS REGION
O: 29JUL2026 13:19:37 32.4N 130.4E MB=5.3 EMSC KYUSHU, JAPAN
Another earthquake seemingly promoted by the full moon today occurred as an M4.9
in the northern mid-Atlantic ridge at a longitude (45 degrees) near the maximum
stress longitude for this full moon. It was not felt in this remote area
of the Atlantic Ridge. This event occurred after local solar noon and was
at a sub-solar latitude for this date. This epicenter is located at 45 degrees from
Chiapas, Mexico (node 8); at 135 degrees from Super-Typhoon Dolphin (node 8)
and at 22.5 degrees (node 16) from Venezuela and was probably promoted by
constructive interference of energy from those sources.
O: 29JUL2026 18:09:46 15.2N 45.9W MB=4.9 EMSC NORTHERN MID-ATLANTIC RIDGE
Moderate to strong aftershocks continued today in the region of Kyushu, Japan.
Tolls continued to rise as rescue teams combed the area and sifted through
debris of collapsed structures and a mall. Those dead now exceed 6 but this is
expected to rise.
The events in Kyushu are at 102 degrees from the eye of Hurricane
Genevieve in the North Pacific off Mexico when the mainshock occurred. It is likely it was promoted
by energy from that powerful source. Two other moderate earthquakes
in the South Atlantic Ridge also occurred at 102 degrees from Hurricane
Genevieve in the past two days.
O: 30JUL2026 00:56:30 32.3N 130.4E ML=4.2 EMSC KYUSHU, JAPAN
O: 29JUL2026 13:19:37 32.4N 130.4E mb=5.3 EMSC KYUSHU, JAPAN
O: 29JUL2026 14:02:34 32.5N 130.6E mb=4.6 EMSC KYUSHU, JAPAN
O: 29JUL2026 20:16:35 32.5N 130.6E mb=4.8 EMSC KYUSHU, JAPAN
O: 29JUL2026 11:47:53 32.7N 130.5E mb=4.5 EMSC KYUSHU, JAPAN
A major eruption (episode 50 of the current activity) of Hawaii's Kilauea volcano occurred today as Hurricane Fausto
passed north of Hawaii. In addition an earthquake north of Hawaii of M 3.6
occurred as that storm passed over that epicenter. This seismic activity
in Hawaii had been expected in this summary as:
This epicenter in Hawaii is located at the 10th node (36 degrees) from Hurricane Genevieve; the 11th node
from Super-Typhoon Dolphin; the sixth node (60 degrees) from Chiapas, Mexico
and the fifth node (72 degrees) from New Zealand and may have been promoted
by energy from those sources.
O: 29JUL2026 00:16:22 20.3N 156.3W ML=3.6 EMSC MAUI REGION, HAWAII
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026. The strongest event
in the area today was an M 5.0 in Guatemala which occurred near local solar
midnight during the strongest solar flare of the past two days and may
have been promoted by SFE from that flare. SWPC gives preliminary data
for this flare as:
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0544 0606 0628 C3.8 (July 30, 2026) 7.6E-03
Southwest Indian Ridge M 4.7 05:46 UT
Myanmar M 3.7 06:18 UT
Tarapaca M 4.6 06:04 UT
Papua M 4.7 05:55 UT
Guatemala M 5.0 06:58 UT
EMSC reported this earthquake was strongly felt in Guatemala at Yepocapa, Palin, Antigua Guatemala, Villa Neuva, Petapa, San Pablo Jocopilas, Solola, Mixco, Fraijanes, Santa Catarina Pinula, Chinautla, San Raimundo, Guatemala City, Cantel, Quetzaltenango, San Marcos and in El Salvador at Acajutla and Santa Tecla.
This event in Guatemala is directly at sub-solar latitude of 14 North Latitude
today, so it is not surprising to see a strong regional shock at this time.
O: 30JUL2026 06:58:56 14.2N 91.0W ML=5.0 EMSC GUATEMALA
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 29JUL2026 10:26:06 14.3N 92.9W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 29JUL2026 17:11:25 13.7N 92.2W ML=4.0 EMSC OFFSHORE GUATEMALA
O: 29JUL2026 09:39:10 13.8N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 09:56:14 13.9N 93.0W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 21:27:14 13.9N 92.9W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 23:37:47 13.9N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 07:59:01 14.0N 92.9W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 29JUL2026 09:03:04 14.0N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 11:01:28 14.0N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 30JUL2026 02:41:20 14.0N 92.9W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 29JUL2026 22:02:51 14.1N 93.2W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 07:29:02 14.2N 93.4W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 10:26:06 14.3N 92.9W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 30JUL2026 01:51:40 14.3N 93.4W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 17:54:50 14.4N 93.3W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
The strong series of earthquakes also continued today in the area south of Tonga with events of M 5.0 and M 5.1.
These events were not reported felt in this remote area.
These epicenters are at the fourth node (90 degrees) from Chiapas and
at 109 degrees from Venezuela may have been promoted by energy from those sources.
O: 29JUL2026 17:07:38 24.9S 175.1W MB=5.0 EMSC SOUTH OF TONGA
O: 29JUL2026 20:52:09 24.8S 175.2W MB=5.1 EMSC SOUTH OF TONGA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
HURRICANE FAUSTO (06E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR FAUSTO 2026-07-30 00:00 UT 22.8N 156.0W 40 kts Pacific east of Hawaii
Hurricane Fausto (06E) continued today north of Hawaii in the north Pacific Ocean with winds up to 40 kts. It is expected to track to the west over the next several days and to dissipate by July 31, 2026. Some seismic enhancement is likely including the possibility of enhanced volcanism and a moderate earthquake about the time of landfall north of Hawaii. The antipode of today's location of Hurricane Fausto is near 23S 25E in South Africa and Mozambique where some enhanced seismicity is possible at this time.
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP DOLPHIN 2026-07-30 00:00 UT 16.4N 165.7E 170 kts North-central Pacific
Super-Typhoon Dolphin (TD 12W) continued today in the north-central Pacific with winds up to 170 kts. It is expected to track to the west but little seismic enhancement is expected in this area at this time. It will then track towards the Mariana Islands reaching super-typhoon intensity with winds up to 180 kts around July 31 to August 1. Enhanced seismicity will depend on the path. This could encounter Honshu Japan as a major typhoon in early August and is likely to remain in the super-typhoon category for at least a week due to the unusually warm waters of the Pacific during the current super-El Nino event. It could pose a significant threat to Japanese seismicity as it makes landfall. The antipode is at 16S 14W in the South Atlantic Ridge area could see enhanced seismicity at this time as a moderate earthquake occurred near that epicenter two days ago.
HURRICANE GENEVIEVE (07E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR GENEVIEVE 2026-07-30 00:00 UT 19.4N 120.4W 105 kts West of Mexico
Hurricane Genevieve continued today West of Mexico with winds up to 105 kts (Category 3 hurricane). It is expected to track to the west but is unlikely to significantly affect regional seismicity at this time. The antipode at 19S 60E is near the South Indian Ridge system - a seismic area in the South Indian Ocean where some enhanced seismicity may occur antipodally to Genevieve at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 27, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0544 0606 0628 C3.8 (July 30, 2026) 7.6E-03
Southwest Indian Ridge M 4.7 05:46 UT
Myanmar M 3.7 06:18 UT
Tarapaca M 4.6 06:04 UT
Papua M 4.7 05:55 UT
Guatemala M 5.0 06:58 UT
630 0019 0022 0025 C1.6 (July 29, 2026) 6.8E-04
Maui, Hawaii M 3.6 00:17 UT
640 0431 0438 0444 C1.2 (July 29, 2026) 9.8E-04
720 1610 1619 1625 C1.6 (July 29, 2026) 1.3E-03
Minahasa M 4.4 16:12 UT
730 1719 1724 1729 C1.3 (July 29, 2026) 8.2E-04
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active July 30 through August 1. Solar M-flare chance: 25% X-class: 1% proton storm: 1%
AP Indicies: global: 5, high: 4, mid-latitude: 6, time of max k: 11:00-13:00 UT; Max k: 2 Global Kp 2.00 0000-0400, July 29; Sunspot Number: 123; Radio Flux: 143
The Hp30 (GFZ) index did not exceed 2 in the past 24 hours.
July 29, 2026
Notable earthquakes and events:
The full moon arrived on July 29, 2026 at 14:36 UT. Longitudes which are at local solar midnight at this hour are near 140E while those at local solar noon are near 40W. These include in the east areas of Japan and the Philippines north to Kamchatka and eastern Indonesia and China and in the west, the Central Atlantic Ridges, portions of South America and Iceland. These are the areas most likely to see tidal triggering in the next week. They include some areas where strong or unusual earthquakes occur and the likelihood of such an event, especially near 135E is considered highly likely in this time frame.
This is the last full moon before the solar eclipse of
August 12, 2026. Often areas which will see enhanced seismicity at the time
of solar eclipses see a foretaste with the prior full moon. An earthquake of M 4.9 accompanied
the full moon at 14:36 UT (exactly at the peak of the full moon - see above)
in the area of Valparaiso Chile with the following EMSC parameters:
O: 29JUL2026 14:36:53 33.3S 72.0W MB=4.9 EMSC VALPARAISO, CHILE
This epicenter was near local solar noon at the time of this earthquake
and was probably promoted by strong tidal stresses with this full moon.
The mainshock was followed a minute later by and M 4.2 aftershock.
EMSC reported it was felt in Chile with moderate shaking at Villa Alemana.
NEIC reported intensity III in Valparaiso.
A moderate foreshock hit this area as reported in the previous issue of this
summary:
"NEIC reported an earthquake of M 4.1 in Valparaiso, Chile was felt with intensity up to II-III in the area(s) of Valparaiso, Chile in Santiago, and in O'Higgins at Rengo and Machali." (July 28, 2026)
This epicenter is located at 120.0 degrees (node 3) from the current location
of Super-Typhoon Dolphin and at the seventh node (51.4 degrees) from
Chiapas and may have been promoted by energy from those sources.
O: 29JUL2026 14:36:53 33.3S 72.0W MB=4.9 EMSC VALPARAISO, CHILE
O: 27JUL2026 17:19:36 33.0S 71.4W mb=4.1 EMSC VALPARAISO, CHILE
An earthquake of M 5.1 in Luzon, Philippines also occurred within minutes of
the completion of the full moon today. EMSC reported it was felt with moderate
shaking in Luzon at Antipolo, Calumpang, Cainta, Pasig City, Pateros, Manila and
Makati City. NEIC reported intensity III in the Philippines in Daet, Bicol, Malanday, Manila, Cainta, Niogan, Pililla, Southern Tagalog. This event occurred near local solar midnight at a latitude which
is near sub-solar (15 North latitude) on this date and was probably promoted
by tidal stresses with the full moon.
The last earthquake within about 150 km of this epicenter in the Philippines
with M>=5.1 was an M 5.3 on September 3, 2024. At the time this summary noted:
"NEIC reported this earthquake of M 5.3 in Luzon, Philippines was felt with intensity up to IV in the area(s) of Luzon, Philippines in Bicol at Daet and Basud and in Tagalog at Lucena, Palestina, Cainta, Taytay, Malanday, and in Manila and Mariveles, Luzon.
EMSC reported strong shaking in the central Philippines in Hondagua Lopez, Cainta, Quezon City, Taguig City, Antipolo, Bacoor and Paranaque City among others.
PHIVOLCS reported intensity V in Quezon at Jomalig and Polillo, IV in Quezon at Burdeos, Panukulan and Patnanungan and Camarines Norte at Parascale, Santa Elena and Vinzons and III in other areas of Quezon, Camarines Norte; City of Taguig and Pateros Quezon City. Lesser shaking was reported in Camarines Sur, City of Angels and the City of Caloocan and Pasig.
An aftershock of M 5.0 was reported by NEIC to have been felt with intensity II-III in the Philippines at Manila and in Taytay, Rizal, Tagalog.
It is likely that this activity was promoted by landfall in the region today of
Tropical Storm Yagi as proposed in previous issues of this summary" (September 3, 2024)
This epicenter is located at the eighth node (45 degrees) from Super-Typhoon Dolphin and at
the fifth node (72 degrees) from New Zealand and may have been promoted by
energy from those sources.
O: 29JUL2026 14:11:04 15.3N 122.8E MB=5.1 EMSC PHILIPPINE ISLANDS REGION
About an hour after the Luzon quake (see above) a second quake in Luzon
occurred about 300 km southeast of that epicenter in the Catanduanes region of the
Philippines. NEIC reported it was felt with intensity IV in Bicol Philippines at Bato and II in Gandara. Earthquakes of M 5.3 in Kyushu, Japan and M 5.0 and M 5.1 in Mindanao
preceded the completion of the full moon about an hour earlier and may have
been promoted by tidal stresses. All of these events occurred within about
an hour of local solar midnight. A similarly timed M 5.4 in Kyushu was the second strongest
aftershock in the area at this writing. NEIC reported this earthquake
was felt with intensity II in Japan at Isahaya, Nagasaki, Ibaraki, Osaka and Kogoshima.
O: 29JUL2026 15:10:02 13.1N 124.6E MB=5.4 EMSC PHILIPPINE ISLANDS REGION
The earthquakes in Mindanao were reported by NEIC to have been felt with intensity
IV in Southern Mindanao at Buayan, San Jose, Conel, Katangawan, Padada, Klinan, Digos and II in Manado, Sulawesi, Indonesia.
O: 29JUL2026 13:23:55 5.3N 125.1E MB=5.1 EMSC MINDANAO, PHILIPPINE ISLANDS REGION
O: 29JUL2026 13:16:59 5.5N 125.4E MB=5.0 EMSC MINDANAO, PHILIPPINE ISLANDS REGION
O: 29JUL2026 13:19:37 32.4N 130.4E MB=5.3 EMSC KYUSHU, JAPAN
Another earthquake seemingly promoted by the full moon today occurred as an M4.9
in the northern mid-Atlantic ridge at a longitude (45 degrees) near the maximum
stress longitude for this full moon. It was not felt in this remote area
of the Atlantic Ridge. This event occurred after local solar noon and was
at a sub-solar latitude for this date. This epicenter is located at 45 degrees from
Chiapas, Mexico (node 8); at 135 degrees from Super-Typhoon Dolphin (node 8)
and at 22.5 degrees (node 16) from Venezuela and was probably promoted by
constructive interference of energy from those sources.
O: 29JUL2026 18:09:46 15.2N 45.9W MB=4.9 EMSC NORTHERN MID-ATLANTIC RIDGE
The strongest earthquake in the world today was an M 6.8 in Kyushu, Japan. NEIC reported it was felt with intensity up to VIII in the epicenter with reported intensities in Kumamoto, Japan of VIII in Jonan (with damage and VII in Yatsushiro, Mashiki, Kikuyo and in Shimbvara, Nagasaki. Intensity V was felt in Saga and Miyazaki and IV in Oita, Fukuoka and South Korea with II-III intensity shaking as far as 600 km in Tokyo and South Korea.
News outlets reported at least a dozen fires accompanied the earthquake and
that several buildings and bridges collapsed or partially collapsed due to the shaking.
Power was out to thousands of homes in Kumamoto Prefecture. Toyota Chip manufacturing
plants in Miyata, Kand and Kokura were closed until further notice. The quake also
reportedly ruptured roads. A shopping mall partially collapsed and there
were likely deaths associated with that. Many residents were evacuated to centers
as strong aftershocks continued. At least six people lost their lives according
to official estimates at this time during the earthquake. A tsunami warning was issued but later withdrawn when no tsunami waves were observed.
The last earthquake in Kyushu, Japan within about 200 km of today's epicenter
with M>=6.8 occurred on January 13, 2025 with M 6.8 and prior to that as an M 7.1 on
August 8, 2024. At the time of the January, 2025 event this summary noted:
"A strong to major earthquake of M 6.9 hit the area of Kyushu, Japan today. The
quake shook buildings and may have generated a tsunami, but no reports of
major damage or high tsunami waves have been officially made. The largest
tsunami wave was measured at 7.8 inches in Miyazaki City. The quake
was felt in Miyazaki and at least one mine injury was reported by a person who
fell down a flight of stars during the quake. The tsunami warning has now been
lifted but some evacuations may still occur. NEIC reported this earthquake was
felt with intensity IV (Some damage) at Miyazaki, VII in Saiki, Oita; VI in Junitomi, Miyazaki; V in Kanoya, Kagoshima dns Koshi, Kumamoto and with IV in Oita, Osaka, Ehime Fukuoka, Hiroshima, Kagoshima, Shizuoka, South Korea." (January 13, 2025)
Today's event occurred near local solar noon near the time of the full moon.
The earthquake on January 13, 2025 also occurred with the full moon of
January 13, 2025. Both appear to have been promoted by tidal stresses
with their respective full moon tides.
Today's epicenter in Kyushu was at 102 degrees from the eye of Hurricane
Genevieve in the North Pacific off Mexico when the mainshock occurred. It is likely it was promoted
by energy from that powerful source. Two other moderate earthquakes
in the South Atlantic Ridge also occurred at 102 degrees from Hurricane
Genevieve in the past two days.
Following is a listing of aftershocks of M>=4 since the mainshock in Kyushu, Japan.
O: 28JUL2026 11:47:30 32.3N 130.4E ML=3.5 EMSC KYUSHU, JAPAN
O: 28JUL2026 08:08:36 32.4N 130.6E Mw=5.6 EMSC KYUSHU, JAPAN
O: 28JUL2026 08:18:54 32.4N 130.5E mb=4.9 EMSC KYUSHU, JAPAN
O: 28JUL2026 10:09:38 32.4N 130.7E ML=4.1 EMSC KYUSHU, JAPAN
O: 29JUL2026 13:19:37 32.4N 130.4E mb=5.3 EMSC KYUSHU, JAPAN
O: 28JUL2026 07:45:30 32.5N 130.6E ML=4.0 EMSC KYUSHU, JAPAN
O: 28JUL2026 09:10:30 32.5N 130.6E ML=4.1 EMSC KYUSHU, JAPAN
O: 28JUL2026 12:10:30 32.5N 130.6E ML=4.2 EMSC KYUSHU, JAPAN
O: 28JUL2026 14:01:57 32.5N 130.6E mb=4.8 EMSC KYUSHU, JAPAN
O: 29JUL2026 14:02:34 32.5N 130.5E mb=4.6 EMSC KYUSHU, JAPAN
O: 28JUL2026 08:57:30 32.6N 130.7E ML=4.1 EMSC KYUSHU, JAPAN
O: 28JUL2026 10:03:13 32.6N 130.8E ML=4.2 EMSC KYUSHU, JAPAN
O: 28JUL2026 12:26:18 32.6N 130.8E mb=4.7 EMSC KYUSHU, JAPAN
O: 28JUL2026 19:38:30 32.6N 130.7E ML=4.1 EMSC KYUSHU, JAPAN
O: 28JUL2026 20:49:30 32.6N 130.7E ML=4.1 EMSC KYUSHU, JAPAN
O: 28JUL2026 07:27:16 32.7N 130.8E Mw=6.8 EMSC KYUSHU, JAPAN
O: 28JUL2026 07:39:30 32.7N 130.8E ML=4.2 EMSC KYUSHU, JAPAN
O: 28JUL2026 07:59:30 32.7N 130.7E ML=4.4 EMSC KYUSHU, JAPAN
O: 28JUL2026 08:54:30 32.7N 130.7E ML=4.1 EMSC KYUSHU, JAPAN
O: 28JUL2026 15:15:30 32.7N 130.7E ML=4.1 EMSC KYUSHU, JAPAN
O: 29JUL2026 11:47:53 32.7N 130.5E mb=4.5 EMSC KYUSHU, JAPAN
O: 29JUL2026 13:19:37 32.4N 130.4E MB=5.3 EMSC KYUSHU, JAPAN
O: 29JUL2026 13:19:37 32.4N 130.4E MB=5.4 NEIC KYUSHU, JAPAN
A major eruption (episode 50 of the current activity) of Hawaii's Kilauea volcano occurred today as Hurricane Fausto
passed north of Hawaii. In addition an earthquake north of Hawaii of M 3.6
occurred as that storm passed over that epicenter. This seismic activity
in Hawaii had been expected in this summary as:
This epicenter in Hawaii is located at the 10th node (36 degrees) from Hurricane Genevieve; the 11th node
from Super-Typhoon Dolphin; the sixth node (60 degrees) from Chiapas, Mexico
and the fifth node (72 degrees) from New Zealand and may have been promoted
by energy from those sources.
O: 29JUL2026 00:16:22 20.3N 156.3W ML=3.6 EMSC MAUI REGION, HAWAII
The strongest earthquake the U.S. or Canada today was an M 5.0 in the Denali National Park area of Central Alaska.NEIC reported it was felt with intensity IV in Denali National Park; III in Matanuska-Susitna Borough, Talkeetna, Fort Richardson, Cantwell, Skwentna, Healy, Fairbanks and II in Palmer.
The last earthquake of equal or greater magnitude than M 5.0 within about
200 km of today's epicenter occurred as an M 5.0 on December 1, 2023.
At the time this summary noted:
"Two events of M 5.0 occurred in Alaska - an M 5.0 in the Andreanof Islands and
an M 5.0 in Central Alaska. NEIC reported this event was felt with intensity up to V in Petersville, Alaska.
EMSC reported it was felt with moderate intensity in Central Alaska at Wasilla,
Palmer, Knik-Fairview, Eagle River, Anchorage, This event occurred within minutes
of the height of the arrival of the CME around 06:00 UT (see above) and was
probably triggered by that ionospheric disturbance.
The last earthquake within about 150 km of this epicenter with M>=5 in Central
Alaska occurred as an M 5.0 on October 4, 2019. Larger earthquakes hit about 200 km from today's epicenter
on February 6, 2022 and May 31, 2021. At the time of the M 5.0 on October 4, 2019 ..." (December 1, 2023)
The strongest aftershock in Chiapas, Mexico today was an M 4.7 near local solar noon
and at the sub-solar latitude for this day of the year. A number of other
events (20) in the aftershock sequence were also recorded today but were
not reported felt.
This epicenter is at the seventh node (51 degrees) from the eye of Hurricane
Genevieve at the time of its occurrence and was probably promoted by energy
from that source.
O: 28JUL2026 20:49:25 63.6N 150.7W ML=5.0 EMSC CENTRAL ALASKA
O: 28JUL2026 20:52:22 63.6N 150.6W ML=3.5 EMSC CENTRAL ALASKA
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026.
NEIC reported this activity was widely felt in Guatemala with IV in Quetzaltenango at Salcaja and III in Olintepeque, Quetzaltenango, in San Andres Semetabaj, Solola, Guatemala City, Petapa, Santa Catrina Pinula, and as far as 200 km from the epicenter in Antigua Guatemala. No felt reports were attributed from Mexico. This earthquakes occurred near local solar midnight. The epicenter
of the Chiapas series was directly at sub-solar latitude of 14 North Latitude
today, so it is not surprising to see a strong aftershock at this time. This
is the strongest aftershock in the Chiapas region since an M 6.0 minutes
after the M 7.3 on July 17, 2026.
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 28JUL2026 19:22:08 13.4N 92.7W ML=4.2 EMSC OFF THE COAST OF GUATEMALA
O: 28JUL2026 20:31:29 13.7N 93.4W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 09:39:10 13.8N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 28JUL2026 09:15:56 13.9N 93.2W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 28JUL2026 10:16:36 13.9N 93.0W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 28JUL2026 23:54:36 13.9N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 03:19:13 13.9N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 09:56:14 13.9N 93.0W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 28JUL2026 08:06:48 14.0N 92.9W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 28JUL2026 08:39:36 14.0N 93.4W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 28JUL2026 08:48:52 14.0N 92.9W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 28JUL2026 10:54:30 14.0N 93.2W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 28JUL2026 20:19:09 14.0N 92.8W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 29JUL2026 07:59:01 14.0N 92.9W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 29JUL2026 09:03:04 14.0N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 11:01:28 14.0N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 28JUL2026 08:28:28 14.1N 92.9W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 28JUL2026 09:48:06 14.1N 92.8W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 29JUL2026 05:50:53 14.1N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 05:58:48 14.1N 93.3W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 28JUL2026 19:12:26 14.2N 93.2W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 29JUL2026 07:29:02 14.2N 93.4W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 28JUL2026 08:25:15 14.3N 92.7W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 29JUL2026 00:40:13 14.3N 92.9W mb=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 29JUL2026 10:26:06 14.3N 92.9W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 28JUL2026 16:14:18 14.5N 92.6W mb=4.7 EMSC OFFSHORE CHIAPAS, MEXICO
The strong series of earthquakes also continued today in the area south of Tonga.
These events with several of M>=5 occurred near local solar noon but
were not reported felt in this remote area.
These epicenters are at the fourth node (90 degrees) from Chiapas and
at 109 degrees from Venezuela may have been promoted by energy from those sources.
O: 29JUL2026 03:52:21 24.8S 175.0W MB=5.0 EMSC SOUTH OF TONGA
NEIC reported an earthquake of M 4.2 in Northern California north of San Francisco was felt with intensity up to II-III in the area(s) of Northern California north of San Francisco with IV in Geyserville, Cloberdale, Yorkville and III in Healdsburg, Boonville, San Francisco, Hopland, Guerneville, Forestville, Middletown, The Sea Ranch, Sausalito, Napa, Kelseyville, and as far as 100+ km from the epicenter.
This is the strongest earthquake in the California geysers area within
about 50 km of today's epicenter since an M 4.4 on May 7, 2026. At the time
this summary noted:
"The strongest earthquake in the U.S. or Canada today was an M 4.4 in the
Geysers area north of San Francisco, California. NEIC reported it was widely
felt in northern California with IV in Middletown, Kelseyville, San Anselmo, Lower Lake; III in Calistoga, Saint Helena, Healdsburg, Hidden Valley Lake, Napa and San Francisco.
This event occurred near local solar midnight and may have been promoted
by tidal stresses which maximize near this hour. The last earthquake in the
Geysers area of northern California with M>=4.4 occurred as an M 4.7 on January
2, 2025." (May 7, 2026)
This epicenter is located at the 10th node from Chiapas (36 degrees) and at 104
degrees from New Zealand and was probably promoted by energy from those sources.
O: 29JUL2026 02:40:06 38.8N 122.9W MW=4.2 NEIC NORTHERN CALIFORNIA
O: 29JUL2026 02:40:06 38.8N 122.9W MW=4.1 EMSC NORTHERN CALIFORNIA
O: 29JUL2026 03:48:38 38.8N 122.9W MD=2.2 EMSC NORTHERN CALIFORNIA
O: 28JUL2026 14:44:35 39.0N 123.1W MD=2.1 EMSC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 4.8 in northern Mindanao, Philippines was felt with intensity up to II-III in the area(s) of northern Mindanao, Philippines with IV at Dapa, Caraga, Philippines.
This epicenter is located at the eighth node (135 degrees) from Chiapas and may have
been promoted by energy from that source.
O: 29JUL2026 00:39:37 10.2N 126.1E MB=4.8 EMSC PHILIPPINE ISLANDS REGION
NEIC reported an earthquake of M 5.4 in New Ireland was felt with intensity up to II-III in the area(s) of New Ireland in Panguna, North Solomons, PNG.
This epicenter is at the fourth node (90 degrees) from the eye of Hurricane
Genevieve at the time of its occurrence and was probably promoted by energy
from that source.
O: 28JUL2026 20:27:57 5.7S 153.5E MW=5.4 EMSC NEW IRELAND REGION, P.N.G.
O: 28JUL2026 23:51:44 4.4S 153.0E mb=4.8 EMSC NEW BRITAIN REGION, P.N.G.
NEIC reported an earthquake of M 4.5 in the Cayman Islands was felt with intensity up to II-III in the area(s) of the Cayman Islands with III in West Bay, Georgetown and Bodden Town Grand Cayman Islands.
This epicenter is at 103 degrees from Super-Typhoon Dolphin and may have
been promoted by energy from that source.
O: 28JUL2026 13:42:17 18.9N 81.1W MB=4.5 EMSC CAYMAN ISLANDS REGION
NEIC reported an earthquake of M 5.2 in northern Peru may have been felt with intensity up to II-III in the area(s) of Peru at Puerto Santa.
This epicenter is at 45 degrees from Hurricane Genevieve and may have
been promoted by energy from that source.
O: 28JUL2026 13:24:34 9.7S 79.8W MW=5.2 EMSC OFF COAST OF NORTHERN PERU
O: 28JUL2026 13:24:33 9.7S 79.8W MW=5.3 NEIC OFF COAST OF NORTHERN PERU
EMSC reported an earthquake of M 4.6 in Xinjiang, China was felt with intensity up to IV in the area(s) of Xinjiang, China in Cholpon-Ata, Kyrgyzstan; Almaty, Chemolgan, Otegen Batyra and Pervomayka, Kazakhstan,
This epicenter is at the third node (120 degrees) from Venezuela and Hurricane Genevieve and near
the third node from Chiapas and may have been promoted by constructive interference
of energy from those sources.
O: 29JUL2026 06:09:58 41.4N 78.8E MB=4.6 EMSC SOUTHERN XINJIANG, CHINA
EMSC reported an earthquake of M 4.7 in Greece was felt with intensity up to IV in the area(s) of Greece in Agios Ioannis, Kardamitsia, Penteli, Ionnina, Velissarios, Rodotopi, Anatoli, Zitsa, Asparangeloi, Igoumenitsa Mesopotamo, Kalovatos, Corfu, Orikum, and in Albania at Vlore, Shengjergj, amd Pazardzhik, Bulgaria.
O: 28JUL2026 20:10:33 39.7N 20.8E MW=4.7 EMSC GREECE
EMSC reported an earthquake of M 4.1 in The Aegean Sea was felt with intensity up to IV in the area(s) of The Aegean Sea in Greece at Glossa, Skiathos, Skopelos,Patotoropm. Ostoaoa. Volos, Nea Fokaia, Marousi, Pefki, Vrilissia, Keratsini, Moskhaton, Arta, Drosochori, Vounplagia.
This epicenter is at 101 degrees from Chiapas, Mexico and may have been
promoted by energy from that source.
O: 28JUL2026 19:17:57 39.3N 23.6E ML=4.1 EMSC AEGEAN SEA
EMSC reported an earthquake of M 4.2 South of Java, Indonesia was felt with intensity up to IV in the area(s) of South of Java, Indonesia in Malang and Banjar Karangsuling.
This epicenter is near the antipode of Venezuela and may have been promoted
by energy from that source.
O: 28JUL2026 13:29:47 9.0S 112.8E ML=4.2 EMSC SOUTH OF JAVA, INDONESIA
EMSC reported an earthquake of M 4.0 in the Aegean Sea, Greece was felt with intensity up to IV in the area(s) of the Aegean Sea, Greece at Ouranoupolis, Nea Roda, Sarti, Ierissos, Sykia, Nikiti, Limenaria, Papagou and in Haskove, Bulgaria and Skopje, Nort Macedonia.
This epicenter is at 101 degrees from Chiapas, Mexico and may have been
promoted by energy from that source.
O: 28JUL2026 08:30:48 40.3N 24.1E ML=4.0 EMSC AEGEAN SEA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
HURRICANE FAUSTO (06E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR FAUSTO 2026-07-29 00:00 UT 22.8N 154.7W 45 kts Pacific east of Hawaii
Hurricane Fausto (06E) continued today north of Hawaii in the north Pacific Ocean with winds up to 45 kts. It is expected to track to the west over the next several days and to dissipate by July 30, 2026. Some seismic enhancement is likely including the possibility of enhanced volcanism and a moderate earthquake about the time of landfall. The antipode of today's location of Hurricane Fausto is near 22S 27E in South Africa and Mozambique where some enhanced seismicity is possible at this time.
SUPER-TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP DOLPHIN 2026-07-29 00:00 UT 15.2N 167.7E 160 kts North-central Pacific
Super-Typhoon Dolphin (TD 12W) continued today in the north-central Pacific with winds up to 160 kts. It is expected to track to the west but little seismic enhancement is expected in this area at this time. It will then track towards the Mariana Islands reaching super-typhoon intensity with winds up to 180 kts around July 29-31. Enhanced seismicity will depend on the path. This could encounter Honshu Japan as a major typhoon in early August and is likely to remain in the super-typhoon category for at least a week due to the unusually warm waters of the Pacific during the current super-El Nino event. It could pose a significant threat to Japanese seismicity as it makes landfall. The antipode is at 15S 13W in the South Atlantic Ridge area could see enhanced seismicity at this time as a moderate earthquake occurred near that epicenter two days ago.
HURRICANE GENEVIEVE (07E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR GENEVIEVE 2026-07-29 00:00 UT 18.3N 118.0W 135 kts West of Mexico
Hurricane Genevieve continued today West of Mexico with winds up to 135 kts (Category 4 hurricane). It is expected to track to the west but is unlikely to significantly affect regional seismicity at this time. The antipode at 18S 62E is near the South Indian Ridge system - a seismic area in the South Indian Ocean where some enhanced seismicity may occur antipodally to Genevieve at this time.
Hurricane Genevieve is a very powerful oceanic storm and could also trigger
seismicity near nodal distance, especially near 103 degrees from the eye.
Some areas at this distance today include Kyushu, Japan and areas of the South
Atlantic among others.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 27, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
480 0308 0319 0345 C5.1 (July 28, 2026) 2.4E-03 *
Scotland M 2.5 03:09 UT
Qinghai, China M 5.8 03:16 UT, M 5.8 03:34 UT
470 0208 0215 0220 C1.8 (July 28, 2026) 1.3E-03
South of Java M 3.9 02:20 UT
540 1113 1120 1123 C1.4 (July 28, 2026) 8.4E-04
560 1740 1747 1752 C1.5 (July 28, 2026) 1.1E-03
610 2336 2345 2355 C1.7 (July 28, 2026) 1.9E-03
New Britain M 4.8 23:51 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: unsettled July 29 active July 30-31. Solar M-flare chance: 30% X-class: 1% proton storm: 1%
AP Indicies: global: 8, high: 5, mid-latitude: 10, time of max k: 11:00-13:00 UT; Max k: 3 Global Kp 3.00 2200-2400, July 28; Sunspot Number: 102; Radio Flux: 143
The Hp30 (GFZ) index reached 3.66 around 12:00 UT today, a light geomagnetic
storm.
July 28, 2026
Notable earthquakes and events:
A series of moderately strong to strong earthquakes occurred today in a number of
different epicentral areas including Kyushu M 6.8; Iceland (M 5.4; Qinghai, China M 5.8, 5.8; the Komandorsky Islands (M 5.8) (discussed below) as the
full moon approached. Most of these occurred near 103 degrees or at antipodal
positions to recent major surface energy sources including strong ocean storms
and major earthquakes. This is the last full moon before the solar eclipse of
August 12, 2026. Often areas which will see enhanced seismicity at the time
of solar eclipses see a foretaste with the prior full moon. Forecast seismicity with this full moon as noted
in this summary is expected as:
"The full moon will arrive on July 29, 2026 at 14:36 UT. Longitudes which are at local solar midnight at this hour are near 140E while those at local solar noon are near 40W. These include in the east areas of Japan and the Philippines north to Kamchatka and eastern Indonesia and China and in the west, the Central Atlantic Ridges and Iceland. These are the areas most likely to see tidal triggering in the next week. They include some areas where strong or unusual earthquakes occur and the likelihood of such an event, especially near 135E is considered highly likely in this time frame." (July 27-28, 2026)
The strongest earthquake in the world today was an M 6.8 in Kyushu, Japan. NEIC reported it was felt with intensity up to VIII in the epicenter with reported intensities in Kumamoto, Japan of VIII in Jonan (with damage and VII in Yatsushiro, Mashiki, Kikuyo and in Shimbvara, Nagasaki. Intensity V was felt in Saga and Miyazaki and IV in Oita, Fukuoka and South Korea with II-III intensity shaking as far as 600 km in Tokyo and South Korea.
New outlets reported at least a dozen fires accompanied the earthquake and
that several buildings collapsed or partially collapsed due to the shaking.
There were no immediate report of casualties.
A tsunami warning was issued but later withdrawn when no tsunami waves were observed.
The last earthquake in Kyushu, Japan within about 200 km of today's epicenter
with M>=6.8 occurred on January 13, 2025 with M 6.8 and prior to that as an M 7.1 on
August 8, 2024. At the time of the January, 2025 event this summary noted:
"A strong to major earthquake of M 6.9 hit the area of Kyushu, Japan today. The
quake shook buildings and may have generated a tsunami, but no reports of
major damage or high tsunami waves have been officially made. The largest
tsunami wave was measured at 7.8 inches in Miyazaki City. The quake
was felt in Miyazaki and at least one mine injury was reported by a person who
fell down a flight of stars during the quake. The tsunami warning has now been
lifted but some evacuations may still occur. NEIC reported this earthquake was
felt with intensity IV (Some damage) at Miyazaki, VII in Saiki, Oita; VI in Junitomi, Miyazaki; V in Kanoya, Kagoshima dns Koshi, Kumamoto and with IV in Oita, Osaka, Ehime Fukuoka, Hiroshima, Kagoshima, Shizuoka, South Korea." (January 13, 2025)
Today's event occurred near local solar noon near the time of the full moon.
The earthquake on January 13, 2025 also occurred with the full moon of
January 13, 2025. Both appear to have been promoted by tidal stresses
with their respective full moon tides.
Today's epicenter in Kyushu is at 102 degrees from the eye of Hurricane
Genevieve in the North Pacific off Mexico. It is likely it was promoted
by energy from that powerful source. Two other moderate earthquakes (see below)
in the South Atlantic Ridge also occurred at 102 degrees from Hurricane
Genevieve today (see below).
O: 28JUL2026 08:08:35 32.4N 130.6E Mw=5.6 EMSC KYUSHU, JAPAN
O: 28JUL2026 08:18:54 32.4N 130.5E mb=4.9 EMSC KYUSHU, JAPAN
O: 28JUL2026 07:45:30 32.5N 130.6E ML=4.0 EMSC KYUSHU, JAPAN
O: 28JUL2026 08:57:30 32.6N 130.7E ML=4.1 EMSC KYUSHU, JAPAN
O: 28JUL2026 07:27:16 32.7N 130.8E Mw=6.8 EMSC KYUSHU, JAPAN
O: 28JUL2026 07:39:30 32.7N 130.8E ML=4.2 EMSC KYUSHU, JAPAN
O: 28JUL2026 07:59:30 32.7N 130.7E ML=4.4 EMSC KYUSHU, JAPAN
O: 28JUL2026 08:54:30 32.7N 130.7E ML=4.1 EMSC KYUSHU, JAPAN
A pair of moderately large earthquakes of M 5.8 and M 5.8 also occurred in Central China in Southern Qinghai today. NEIC reported these may have been felt with intensity up to VIII in the Oula, Xiuma area of China.
Damage is expected but reports from this area are often delayed. The last
earthquake of M>=5.8 within about 200 km of these epicenters occurred as an
M
This activity may have been promoted by the strongest solar flare of the day.
The first M 5.8 occurred near the peak output of this C5.1 flare. Preliminary data for this flare from SWPC follow:
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0308 0319 0345 C5.1 (July 28, 2026) 2.4E-03 *
Scotland M 2.5 03:09 UT
Qinghai, China M 5.8 03:16 UT, M 5.8 03:34 UT
The only earthquake within about 150 km of today's epicenter with M>=5.8 in the
past 35 years was an M 6.1 on September 12, 2000. A major earthquake of M 7.3
occurred about 200 km to the south west of today's epicenter on May 21, 2021.
At the time this summary noted:
"The strongest earthquake in the world today was an M 7.3-7.4 in southern Qinghai, China. NEIC reported maximum intensity VII in Qinghai, China at Xining with II-III shaking ini China at Lanzhou, Gansu, Chengdu, Sichean, Kian, Shaanxi, Anshun, Guizhou, Changsham Hunan and in India at Pasighat Arunachal Pradesh and Dhlia Gaon, Assam.
It was followed by a series of moderate aftershocks. The M 7.3 followed an M 6.2
in Yunnan, China earlier in the day. Chinese media reported at least three people
were kill and 33 injured. The event in Yunnan occurred near teh city of Dali,
a popular tourist destination accoring to CENC (Chinese Earthquake Networks Centre).
All of the deaths occurred with the Yunnan quake as well as 28 of the 33 reported
injuries. At least 192 building collapsed in this earthquake. Two bridges also collpased and
several sections of highways were destroyed. The larger quake
in Qinghai was less damaging as it occurred in a sparsely populated area.
At least 20,000 people were relocated following today's earthquakes in China.
NEIC reported the M 6.1-6.2 in Yunnan, China was felt with intensity VIII in yunnan at Dali and III in Kunning and Leshan. It was also felt in Vietnam and India.
The remnants of Tropical Cyclone Tauktae were located over the Chinese epicenter
when the earthquakes occurred today. The combined effects of string tidal stresses
with the loading effects of TC Tautere had previously been hypothesized as a
potential enhancer of regional seismicity in Central Asia at this time as:
"Tropical Cyclone Tauktae made landfall in western India in the area of Gujarat
over the past two days. It is currently headed inland and is located near 30N
71E in the region of Afghanistan and Pakistan. This was a very deadly storm
and was according to news sources, the strongest storm ever to hit the west
coast of India in modern times. As it made landfall with winds up to 205 kph in the region of Gujarat
it killed up to 26 people and did great damage to property. A number of barges
in the Arabian Sea were capsized during this storm but most people were
rescued. When Tauktae made landfall this summary reported a moderate
earthquake in Gujarat and the forecast for regional seismicity induced by
stresses from this storm as published in earlier issues of this summary read:
...
"The new moon arrived on May 11, 2021 at 19:00 UT. Longitudes which were at local solar noon at this hour are near 105 West and those at local solar midnight near 75 East longitude. In the west these include areas of central and Western U.S. and Canada and western Mexico as well as portions of the East Pacific Rise. In the east area near 75E include Afghanistan, India, Hindu Kush, Iran and eastern Indonesia and portions of the mid-Indian ridges. These regions are expected to see enhanced seismicity during the coming week. Other tidally promoted seismicity may occur elsewhere and is most likely near local solar midnight and noon when tidal stresses are generally maximized." (May 11-13, 2021)
Another likely promoter of today's event is the very strong Tropical Cyclone Tauktae as noted in previous issues of this summary:
"Tropical Cyclone Tauktae (01A) continued in the area west of India today with winds up to 185 kts. It is expected to track to the north and may impact regional seismicity in Gujarat, western India and the area of Pakistan and Afghanistan in the next several days. Land fall is expected south of Karachi, Pakistan around May 18. The antipode is at 19S 108W over the East Pacific Rise where some seismicity may be promoted at this time." (May 14-18, 2021)
Tropical Cyclone Tauktae made landfall at the same time as this earthquake
occurred within about 50 km of this epicenter.
Following landfall of Tauktae, a strong earthquake occurred at the antipode
of this storm in the South East Pacific Rise with M 6.6. This event was
an expected consequence of TC Tauktae as discussed above. The only earthquake
of larger magnitude in this region of the Southeast Pacific Rise in the past
30 years was an M 7.2 on October 9, 2014." (May 20, 2021)
The M 6.6 in the East Pacific Rise is not far from the antipode of M 7.4 in Qinghai and
may have helped promote the earthquakes in western China today.
Today's M 7.4 in Qinghai occurred within minutes of local solar midnight
and was likely promoted by high tidal stresses which maximize near this time.
Both this and the Yunnan quake earlier in the day were also likely promted
by high tidal stresses at this longitude associated with the recent new moon
as previously (and above) expected in this summary. The M 7.4 was followed
about an hour later by a C4.8 solar flare - the strongest flare since an M3.9 on
May 7, 2021. The flare could not have triggered the event in Qinghai but is
consistent with an interplanetary phenomenon such as a GRB or gravity wave helping to trigger both.
Major earthquakes within about 300 km of today's epicenter occurred in 1927, 1937 and 1947
with M 7.6, 7.7 and 8.0. The last of these was an M 7.7 on March 17, 1947 about 150 km
south of today's event. The last within about 150 km was an M 7.6 on January 7, 1937.
That event was reported in our history section on January 7, 2021:
" 1 7 13 20 41 1937 35.500 97.600 0 7.6 So. China
Destructive in Tsinghai Province."
It is interesting to note that the earthquake in 1927 of M 8.3 northeast of today's
epicenter also occurred on May 22, 1927 and killed 200,000 with extreme
damage in Qinghai Province, China.." (May 21, 2021)
Today's epicenter is at 101 degrees from New Zealand and at the third node (120 degrees)
from Hurricane Genevieve and may have been promoted by energy from those sources.
O: 28JUL2026 03:34:06 35.4N 99.5E Mw=5.8 EMSC SOUTHERN QINGHAI, CHINA
O: 28JUL2026 08:04:11 35.3N 99.7E mb=5.1 EMSC SOUTHERN QINGHAI, CHINA
O: 28JUL2026 03:16:08 35.4N 99.6E Mw=5.8 EMSC SOUTHERN QINGHAI, CHINA
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake of July 17, 2026. The strongest aftershock today
was an M 5.9. NEIC reported this aftershock was widely felt in Guatemala with IV in Quezaltenango at Salcaja and III in Olintepeque, Quetzaltenango, in San Andres Semetabaj, Solola, Guatemala City, Petapa, Santa Catrina Pinula, and as far as 200 km from the epicenter in Antigua Guatemala. No felt reports were attributed from Mexico. This earthquakes occurred near local solar midnight. The epicenter
of the Chiapas series was directly at sub-solar latitude of 14 North Latitude
today, so it is not surprising to see a strong aftershock at this time. This
is the strongest aftershock in the Chiapas region since an M 6.0 minutes
after the M 7.3 on July 17, 2026.
This activity in Chiapas is at the third node (120 degees) from Kyushu, Japan
and at 106 degrees from New Zealand and may have been promoted by energy from that source.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 28JUL2026 05:43:39 13.8N 92.9W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 28JUL2026 05:51:00 14.0N 93.0W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 28JUL2026 08:06:48 14.0N 92.9W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 28JUL2026 08:39:36 14.0N 93.4W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 27JUL2026 12:01:34 14.1N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 28JUL2026 05:52:26 14.1N 92.7W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 28JUL2026 06:09:16 14.1N 92.9W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 28JUL2026 08:28:28 14.1N 92.9W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 27JUL2026 22:31:09 14.3N 93.1W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 28JUL2026 05:35:18 14.3N 92.6W Mw=5.9 EMSC OFFSHORE CHIAPAS, MEXICO
O: 28JUL2026 08:25:15 14.3N 92.7W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
An M 5.4 was felt today in the area of Antofagasta, Chile. NEIC reported
it was felt in the area of Calama, Antofagasta with intensity II. This
is the strongest earthquake in a series which began several days ago and
has included an event of M 5.2. At the time this summary noted this activity
as:
"This summary has been following the sequence of events at 45 degrees (node 8)
from Chiapas with interest over the past several days. In the previous
issue of this summary it was noted for instance:
"In particular the series referred to in the Antofagasta region of Chile
intensified today with two moderate earthquakes of M 4.2 and 4.1 at 45
degrees from the Chiapas mainshock. This sequence could intensify further
in the next several days and could include events in the region of M>=5.
Today's earthquakes in Antofagasta were reported by NEIC to have been felt with intensity III in Antofagasta.
EMSC reported moderate shaking in Chile at Arica, Tarapaca, Iquique." (July 22, 2026)
This sequence climaxed today with an M 5.1 in Antofagasta, Chile and a second
event of M 5.1 south of this in Atacama, Chile. EMSC reported these events
were felt with moderate intensity in Calama, Chile.
These epicenters are respectively at 44.8 degrees and 46.9 degrees south
of the NEIC Chiapas epicenter and qualify as eighth nodal earthquakes (at 45 degrees).
These illustrate how nodality can be used to help forecast seismic activity.
Like the previous activity in Antofagasta, today's earthquake is located
near 45 degrees (44.8) from Chiapas and was probably promoted by energy
from that source.
O: 27JUL2026 08:57:43 23.5S 68.6W ML=5.4 EMSC ANTOFAGASTA, CHILE
A strong series of earthquakes also occurred today in the area south of Tonga.
These events with several of M>=5 occurred near local solar noon but
were not reported felt in this remote area.
These epicenters are at the fourth node (90 degrees) from Chiapas and
at 109 degrees from Venezuela may have been promoted by energy from those sources.
O: 27JUL2026 08:44:08 24.7S 175.2W mb=5.2 EMSC SOUTH OF TONGA
O: 27JUL2026 08:47:18 24.7S 175.2W mb=5.2 EMSC SOUTH OF TONGA
O: 27JUL2026 23:12:12 24.7S 175.2W mb=5.1 EMSC SOUTH OF TONGA
NEIC reported a pair of earthquakes of M 5.0 and M 4.9 in the South Atlantic Ocean was not felt in this remote area today.
The second of these (M 4.9) occurred near local solar midnight and may have been promoted
by tidal and/or geomagnetic effects. This is an unusual epicenter for moderate
earthquakes. The only earthquake recorded within about 200 km of this epicenter in the past
35 years with M>=4 was an M 4.4 on June 4, 1999.
This epicenter is located at 101 degrees from Hurricane Genevieve and at 80.0 degrees (node nine) from Chiapas and 110 degrees
from New Zealand and at 143 degrees from Mindanao may have been promoted by
energy from those sources.
O: 26JUL2026 22:39:02 22.5S 20.3W MB=5.0 EMSC SOUTH ATLANTIC OCEAN
O: 27JUL2026 02:11:32 22.5S 20.3W mb=4.9 EMSC SOUTH ATLANTIC OCEAN
A subsequent earthquake in the southern Mid-Atlantic of M 5.3 occurred near
local solar midnight and may have been promoted by tidal and/or geomagnetic
stresses which maximize near this hour.
This epicenter is nearly antipodal to the current position of Typhoon Dolphin
and may have been promoted by energy from that source and like the event
further to the south it is at 102 degrees from Hurricane Genevieve (like the
M 6.8 in Kyushu, Japan today).
This summary had noted in this and previous issues the position of Typhoon
Dolphin and possible antipodal activity as:
"Typhoon Dolphin (TD 12W) continued today in the north-central Pacific with winds up to 90 kts. It is expected to track to the west but little seismic enhancement is expected in this area at this time. It will then track towards the Mariana Islands reaching super-typhoon intensity with winds up to 180 kts around July 31. Enhanced seismicity will depend on the path. This could encounter Honshu Japan as a major typhoon in early August and is likely to remain in the super-typhoon category for at least a week due to the unusually warm waters of the Pacific during the current super-El Nino event. It could pose a significant threat to Japanese seismicity as it makes landfall. The antipode is at 14S 10W in the South Atlantic could see enhanced seismicity at this time." (July 27-28, 2026)
O: 28JUL2026 01:27:52 12.7S 14.6W mb=5.3 EMSC SOUTHERN MID-ATLANTIC RIDGE
A third event in the south Atlantic Ridge of M 5.0 occurred near Saint Helena and may have been felt lightly in Georgetown, Saint Helena.
Like the events to the south this epicenter is also nearly antipodal
to Typhoon Dolphin and at 102 degrees from Hurricane Genevieve and may have
been promoted by energy from those two strong storms.
O: 27JUL2026 22:32:03 7.5S 13.5W mb=5.0 EMSC ASCENSION ISLAND REGION
NEIC reported an earthquake of M 5.4 in Iceland was felt with likely intensity up to VIII near Akureyri.
The last earthquake of M>=5.4 within about 200 km of this epicenter in
Iceland occurred on October 29, 2025 with M 5.4 but the last event of larger magnitude
in this area was during an eruption on August 26-27, 2014. At the time this summary noted:
"The earthquake in Iceland is in a volcanic area of central Iceland. At M 5.4
it is the largest event in this region of Iceland since an M 5.4 on December 15, 2014
but the last and only such event in the past 25 years in this area of significantly
larger magnitude occurred at the beginning of this series on August 26, 2014 with M 5.7.
At the time this summary noted:
"The earthquake of M 5.7 in Iceland is the strongest recorded in that area
since an M 5.8 on September 16, 2002, the only other event of this size in
Iceland in the past 25 years. It is part of the sub-glacial Bardarbunga volcanic eruption
in the central portion of that island." (August 26, 2014)
Oddly enough, this earthquake in Iceland in 2014 occurred while Hurricane Cristobal
was near the same position where Hurricane Melissa now stands. ..." (October 29, 2025)
This earthquake may have been promoted by strong tidal stresses associated
with the full moon of July 29 (see above). It joined a series of moderately large earthquakes
within about 3 minutes of each other including this, an M 5.9 in Chiapas, Mexico
(see above) and an M 4.8 in Santa Cruz, Chile.
Today's epicenter in Iceland is located at the fifth node from Chiapas, Mexico (72 degrees) and at
102 degrees from Typhoon Dolphin, a major typhoon in the central Pacific
and may have been promoted by energy from those sources.
O: 28JUL2026 05:36:40 64.7N 17.4W Mw=5.3 EMSC ICELAND
O: 28JUL2026 05:36:39 64.7N 17.4W Mw=5.4 NEIC ICELAND
Two earthquakes at antipodal positions to recent major earthquakes occurred
today. These were an M 4.1 off the coast of Portugal - antipodal to the
M 6.7 in New Zealand and an M 4.5 south of Java - exactly antipodal to the
M 7.5 quakes in Venezuela. Antipodal triggering of earthquakes has been
noted on many previous occasions and is probably caused by strongly concentrated
seismic energy from major events at the antipode.
A foreshock to the event in Portugal occurred near local solar noon and may have been
promoted by tidal and/or geomagnetic stresses.
O: 27JUL2026 13:39:20 43.8N 10.4W ML=2.7 EMSC NORTH ATLANTIC OCEAN
O: 27JUL2026 20:57:05 43.4N 10.1W ML=4.1 EMSC NORTH ATLANTIC OCEAN
O: 27JUL2026 17:00:58 11.1S 111.3E ML=4.5 EMSC SOUTH OF JAVA, INDONESIA
O: 28JUL2026 02:20:42 10.7S 112.9E ML=3.9 EMSC SOUTH OF JAVA, INDONESIA
NEIC reported an earthquake of M 5.8 in the Komandorsky Islands north of Kamchatka, Russia was felt with intensity up to II-III in the area(s) of Kthe Komandorsky Islands north of Kamchatka, Russia near Ust'-Kamchatsk Staryy.
The last earthquake within about 200 km of this epicenter with M>=5.8 occurred
as an M 5.8 on February 26, 2025. At the time this summary noted:
"The strongest earthquake in the world today was an M 5.8 in the Komandorsky Islands of Russia.
It was not reported felt in this remote area. This earthquake occurred within minutes
of local solar noon - a prime time for tidal and/or geomagnetic triggering with the upcoming new moon.
The last earthquake in the Komandorsky
Islands within about 250 km of this epicenter with M>=5.8 occurred on October 26, 2023 with M 5.9.
At the time this summary noted:
"An earthquake of high latitudes also occurred today in the Komandorsky Islands of Russia
with M 5.9. This is the strongest earthquake in the Komandorsky Islands since an M 6.0
on September 20, 2022, the only such event in the past 3 years. At the time this summary noted:
"The strongest earthquake in the world today was an M 6.0 in the Komandorsky Islands, Alaska.
It may have been lightly felt as far as Alaska.
The last earthquake of larger magnitude than M 6.0 in the Komandorsky Islands
occurred as an M 6.6 to the west of today's event on March 16, 2021." (September 20, 2023, October 26, 2023, February 26, 2025)
Today's epicenter in the Komandorsky Islands is at 101 degrees from New Zealand and from Venezuela and at the
fifth node (72 degrees) fron Hurricane Genevieve and may have been promoted
by constructive interference of energy from those sources.
O: 28JUL2026 04:42:19 56.0N 164.9E Mw=5.8 EMSC KOMANDORSKIYE OSTROVA REGION
NEIC reported an earthquake of M 2.5 in Eastern Los Angeles, California was felt with intensity up to II-III in the area(s) of Eastern Los Angeles, California in Los Angeles, Valyermo and Chino Hills.
O: 27JUL2026 12:50:21 33.7N 117.0W ML=2.3 EMSC SOUTHERN CALIFORNIA
O: 27JUL2026 23:49:30 34.0N 117.0W ML=2.5 EMSC SOUTHERN CALIFORNIA
NEIC reported an earthquake of M 5.3 in Mindanao, Philippines was felt with intensity up to II-III in the area(s) of Mindanao, Philippines in Barra, Canocotan and Dapa, Caraga.
O: 27JUL2026 23:06:34 7.6N 126.6E mb=5.3 EMSC MINDANAO, PHILIPPINES
NEIC reported an earthquake of M 4.2 in North Island, New Zealand was felt with intensity up to II-III in the area(s) of North Island, New Zealand in Napier, Hawke's Bay.
O: 27JUL2026 21:24:29 39.3S 177.1E mb=4.2 EMSC OFF E. COAST OF N. ISLAND, N.Z
NEIC reported an earthquake of M 4.1 in Valparaiso, Chile was felt with intensity up to II-III in the area(s) of Valparaiso, Chile in Santiago, and in O'Higgins at Rengo and Machali.
O: 27JUL2026 17:19:36 33.0S 71.4W mb=4.1 EMSC VALPARAISO, CHILE
NEIC reported earthquakes of M 3.4 and 2.5 in Nevada were felt with intensity up to II-III in the area(s) of Nevada at Silver Springs, Garenerville and Fallon.
O: 27JUL2026 16:13:18 39.3N 119.0W Mw=3.4 EMSC NEVADA
O: 27JUL2026 16:13:58 39.3N 119.1W ML=2.5 EMSC NEVADA
NEIC reported earthquakes of M 2.6, 2.5 and 2.4 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in Kelseyville, Berkeley and Sacramento.
O: 27JUL2026 15:29:01 38.8N 122.7W MD=2.6 EMSC NORTHERN CALIFORNIA
O: 27JUL2026 15:29:56 38.8N 122.7W MD=2.5 EMSC NORTHERN CALIFORNIA
O: 27JUL2026 21:35:39 38.8N 122.8W MD=2.4 EMSC NORTHERN CALIFORNIA
EMSC reported an earthquake of M 3.9 in Iceland was felt with intensity up to IV in the area(s) of Iceland in Mosfellsbaer, Reykjavik, Selfoss, Seltjarnarnes.
O: 27JUL2026 00:36:17 64.1N 21.3W ML=3.9 EMSC ICELAND
EMSC reported an earthquake of M 4.6 in northern Chile was felt with intensity up to IV in the area(s) of northern Chile in Tarapaca at Iquique and Arica.
O: 27JUL2026 10:24:54 20.2S 69.3W mb=4.8 EMSC TARAPACA, CHILE
EMSC reported an earthquake of M 2.5 in Scotland was felt with intensity up to IV in the area(s) of Scotland in Spean Bridge, Scottish Highlands with loud rumbling.
O: 28JUL2026 03:09:54 56.9N 4.9W ML=2.5 EMSC SCOTLAND, UNITED KINGDOM
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
HURRICANE FAUSTO (06E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR FAUSTO 2026-07-28 00:00 UT 21.8N 149.7W 70 kts Pacific east of Hawaii
Hurricane Fausto (06E) continued today north-east of Hawaii in the north Pacific Ocean with winds up to 70 kts. It is expected to track to the west over the next several days remaining at hurricane force winds with gusts up to 100 kts but is not expected to significantly affect regional seismicity at this time. It will then make landfall in northern Hawaii around July 29-31, 2026 where some seismic enhancement is likely including the possibility of enhanced volcanism and a moderate earthquake about the time of landfall. The antipode of today's location of Hurricane Fausto is near 22S 31E near the coast of South Africa where some enhanced seismicity is possible.
TYPHOON DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TYPG DOLPHIN 2026-07-28 00:00 UT 13.3N 170.8E 90 kts North-central Pacific
Typhoon Dolphin (TD 12W) continued today in the north-central Pacific with winds up to 90 kts. It is expected to track to the west but little seismic enhancement is expected in this area at this time. It will then track towards the Mariana Islands reaching super-typhoon intensity with winds up to 180 kts around July 31. Enhanced seismicity will depend on the path. This could encounter Honshu Japan as a major typhoon in early August and is likely to remain in the super-typhoon category for at least a week due to the unusually warm waters of the Pacific during the current super-El Nino event. It could pose a significant threat to Japanese seismicity as it makes landfall. The antipode is at 14S 10W in the South Atlantic could see enhanced seismicity at this time.
HURRICANE GENEVIEVE (07E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR GENEVIEVE 2026-07-28 00:00 UT 17.3N 115.0W 145 kts West of Mexico
Hurricane Genevieve continued today West of Mexico with winds up to 145 kts (Category 5 hurricane). It is expected to track to the west but is unlikely to significantly affect regional seismicity at this time. The antipode at 17S 66E is near the South Indian Ridge system - a seismic area in the South Indian Ocean where some enhanced seismicity may occur antipodally to Genevieve at this time.
Hurricane Genevieve is a very powerful oceanic storm and could also trigger
seismicity near nodal distance, especially near 103 degrees from the eye.
Some areas at this distance today include Kyushu, Japan and areas of the South
Atlantic among others.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 27, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0308 0319 0345 C5.1 (July 28, 2026) 2.4E-03 *
Scotland M 2.5 03:09 UT
Qinghai, China M 5.8 03:16 UT, M 5.8 03:34 UT
340 0232 0243 0330 M1.0 (July 27, 2026) 5.4E-03 *
South of Tonga M 4.9, 02:42, M 5.0 03:12 UT M 5.2 03:36 UT
Hindu Kush M 4.2 03:09 UT
Chiapas M 4.2 03:30 UT
Andreanof Is. M 3.7 03:22 UT
330 0031 0050 0104 C1.6 (July 27, 2026) 2.9E-03
Iceland M 3.9 00:36 UT
Sumatra M 4.0 00:50 UT
Oaxaca M 4.2 00:56 UT
Tonga M 4.6 01:05 UT
390 1336 1342 1347 C1.5 (July 27, 2026) 1.1E-03
North Atlantic M 2.8 13:39 UT
420 1713 1725 1731 C2.8 (July 27, 2026) 2.2E-03
Valparaiso M 4.1 17:19 UT
430 1935 1948 1953 C3.6 (July 27, 2026) 2.6E-03
Argentina M 3.8 19:37 UT
440 2233 2244 2248 C3.3 (July 27, 2026) 2.0E-03
Central Peru M 4.4 22:36 UT
Ascension Is. M 5.0 22:32 UT
Chiapas M 4.0 22:31 UT
450 2251 2259 2305 C3.5 (July 27, 2026) 2.6E-03
Papua M 4.1 22:57 UT
Mindanao M 5.3 23:06 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: unsettled July 29-30 active July 28. Solar M-flare chance: 40% X-class: 10% proton storm: 5%
AP Indicies: global: 7, high: 3, mid-latitude: 7, time of max k: 11:00-13:00 UT; Max k: 3 Global Kp 3.00 2200-2400, July 27; Sunspot Number: 89; Radio Flux: 147
July 27, 2026
Notable earthquakes and events:
The strongest earthquake in the world today was an M 5.8 in the eastern Andreanof Islands, Aleutians, Alaska.
It may have been felt in the Atka area. The last earthquake of M>=5.8 within about 150
km of this epicenter occurred on March 19, 2016 with M 6.0-6.2. At the time
this summary noted:
"After several days of relative quiet in the aftershock zone of the M 6.3 Andreanof Islands quake of March 12, a second similar event occurred today.
It occurred west of the March 12 mainshock and may indicate a stress migration
in that direction. An M 5.0 foreshock occurred 12.5 minutes earlier and PCS/SCP waves
from this event may have triggered the mainshock. These seismic waves reflect
off internal boundaries and return to the epicentral area after this elapsed time.
Many larger aftershocks occur 12-13 minutes after mainshocks and are probably
being triggered by this phase. NEIC reported the mainshock was felt in Atka,
Alaska with intensity II. This summary had expected moderate to strong aftershocks
were likely following the events of March 12 as follows:
"Moderate aftershocks continued in the Andreanof Islands, Aleutians today. The
largest of these was M 5.4 but an M 5.0 also occurred. Ths may continue for
several more days." (March 13, 2016)
No tsunami was expected nor observed with the M 6.2 earthquake today which hit the eastern
Andreanof Islands. Prior to the March 12 M 6.3, the last earthquake in this area within about 200 km of this epicenter in the
Andreanof Islands of M>=6.2 occurred August 30 and September 4, 2013 (M 7.0, 6.5)." (March 19, 2016)
" an M 5.0 in the eastern Andreanof Islands, Aleutians, Alaska the
only other event in the world with M>=5.0 in the past 24 hours.
Neither of these events was reported felt in their respective epicentral areas.
The earthquake in the Andreanof Islands was followed by an aftershock of M 4.0
within a couple of minutes of local solar noon. This may indicate the area
is stresses with the potential for a larger (possibly strong) earthquake
in the next several days. The last earthquake with M>=5.0 within about 200 km of this
epicenter was an M 5.0 occurred on February 10, 2026 with M 5.0 about 200
km west of today's epicenter but the largest within 150 km of this
Andreanof Islands epicenter with M>=5 occurred on December 1, 2025 with M 5.1 but the last of significantly larger magnitude in this area was an M 5.4 on July 16, 2025.
At the time this summary noted:
"The earthquake in the Alaska Peninsula was preceded by an M 5.5 in the central
Aleutians, Alaska. This earthquake was not reported felt. These two events
may be related. This earthquake was reported lightly felt in the general
epicentral area by NEIC." (July 16, 2025)
Today's epicenter is near 103 degrees from the M 6.7 in New Zealand and may have
been promoted by energy from that source. It is also at the fifth node (72 degrees)
from Chiapas and at the fourth node (90 degrees) from Venezuela and may have
been promoted by energy from those sources as well.
O: 26JUL2026 17:16:12 51.4N 175.1W MB=3.9 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
O: 26JUL2026 08:35:19 51.5N 173.3W Mw=5.8 EMSC ANDREANOF ISLANDS, ALEUTIAN IS.
O: 26JUL2026 16:06:59 51.5N 173.4W ML=3.7 EMSC ANDREANOF ISLANDS, ALEUTIAN IS.
O: 26JUL2026 13:18:43 51.6N 173.4W mb=4.3 EMSC ANDREANOF ISLANDS, ALEUTIAN IS.
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake yesterday but the series declined
considerably in intensity over the day. The strongest aftershock today
was an M 4.6. The mainshock was extensively discussed in this summary in previous issues and readers are referred
to those issues for further details as presented at that time.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 26JUL2026 09:06:37 13.8N 93.2W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 07:55:21 13.9N 92.9W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 12:18:28 14.0N 93.0W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 21:30:18 14.0N 93.3W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 27JUL2026 05:55:40 14.0N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 10:01:18 14.1N 93.6W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 16:32:51 14.1N 93.4W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 22:10:48 14.1N 93.1W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 27JUL2026 05:25:09 14.1N 93.2W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 08:52:33 14.2N 93.3W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 27JUL2026 01:39:00 14.2N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 27JUL2026 02:13:40 14.2N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 27JUL2026 03:30:00 14.3N 93.4W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 10:04:58 14.4N 92.2W mb=4.2 EMSC OFFSHORE GUATEMALA
O: 26JUL2026 15:54:05 15.2N 93.2W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 26JUL2026 12:23:35 15.3N 93.3W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 26JUL2026 17:58:29 15.7N 93.7W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 26JUL2026 09:38:10 13.5N 92.3W ML=4.1 EMSC OFF THE COAST OF GUATEMALA
O: 26JUL2026 14:48:21 13.5N 92.4W ML=4.3 EMSC OFF THE COAST OF GUATEMALA
NEIC reported an earthquake of M 4.7 in the southern Mid-Atlantic Ridge was not felt in this remote area.
This is at an unusual epicenter. The last earthquake within about 200 km of
this epicenter with M>=4.7 occurred on August 8, 2021 as a series with strongest magnitude M 5.3.
"Antipodal earthquakes of M 5.2 each occurred in the Near Islands, Aleutians, Alaska and
then in the Southern Mid-Atlantic Ridge today. These were note reported felt
in these remote areas. The earthquakes in the Southern Mid-Atlantic followed
a pair of M 5.0 events reported in this summary in the previous issue as:
"Two similar events occurred in the southern Mid-Atlantic Ridge with M 5.0. It occurred
near local solar midnight and also was probably promoted by tidal stresses
associated with today's new moon. A strong M 6.6 hit about 200 km southwest of
today's epicenter on April 3, 2021." (August 9, 2021)
The M 5.2 today occurred within about half an hour of local solar noon and
was also probably promoted by high tidal stresses associated with the new moon.
This summary had forecast seismicity with this new moon" (August 9, 2021)
Today's epicenter - like those yesterday in Vanuatu and New Zealand - is at 101 degrees
from Chiapas, Mexico and may have been promoted by energy from that source.
O: 25JUL2026 06:29:22 56.6S 5.6W MD=4.7 NEIC SOUTHERN MID-ATLANTIC RIDGE
An M 5.4 was felt today in the area of Antofagasta, Chile. NEIC reported
it was felt in the area of Calama, Antofagasta with intensity II. This
is the strongest earthquake in a series which began several days ago and
has included an event of M 5.2. At the time this summary noted this activity
as:
"This summary has been following the sequence of events at 45 degrees (node 8)
from Chiapas with interest over the past several days. In the previous
issue of this summary it was noted for instance:
"In particular the series referred to in the Antofagasta region of Chile
intensified today with two moderate earthquakes of M 4.2 and 4.1 at 45
degrees from the Chiapas mainshock. This sequence could intensify further
in the next several days and could include events in the region of M>=5.
Today's earthquakes in Antofagasta were reported by NEIC to have been felt with intensity III in Antofagasta.
EMSC reported moderate shaking in Chile at Arica, Tarapaca, Iquique." (July 22, 2026)
This sequence climaxed today with an M 5.1 in Antofagasta, Chile and a second
event of M 5.1 south of this in Atacama, Chile. EMSC reported these events
were felt with moderate intensity in Calama, Chile.
These epicenters are respectively at 44.8 degrees and 46.9 degrees south
of the NEIC Chiapas epicenter and qualify as eighth nodal earthquakes (at 45 degrees).
These illustrate how nodality can be used to help forecast seismic activity.
Like the previous activity in Antofagasta, today's earthquake is located
near 45 degrees (44.8) from Chiapas and was probably promoted by energy
from that source.
O: 27JUL2026 08:57:43 23.5S 68.6W ML=5.4 EMSC ANTOFAGASTA, CHILE
A strong series of earthquakes also occurred today in the area south of Tonga.
These events with several of M>=5 occurred near local solar noon but
were not reported felt in this remote area.
These epicenters are at the fourth node (90 degrees) from Chiapas and
at 109 degrees from Venezuela may have been promoted by energy from those sources.
O: 27JUL2026 02:42:08 24.4S 175.0W MW=4.9 EMSC SOUTH OF TONGA
O: 27JUL2026 01:38:46 24.5S 175.1W mb=4.9 EMSC SOUTH OF TONGA
O: 27JUL2026 02:32:53 24.5S 175.1W Mw=4.9 EMSC SOUTH OF TONGA
O: 27JUL2026 03:12:04 24.5S 175.0W mb=5.0 EMSC SOUTH OF TONGA
O: 27JUL2026 01:34:29 24.6S 175.1W mb=4.9 EMSC SOUTH OF TONGA
O: 27JUL2026 01:54:13 24.6S 175.0W mb=5.1 EMSC SOUTH OF TONGA
O: 27JUL2026 03:36:43 24.6S 175.2W Mw=5.2 EMSC SOUTH OF TONGA
O: 27JUL2026 05:55:12 24.6S 174.8W mb=4.8 EMSC SOUTH OF TONGA
O: 27JUL2026 08:44:08 24.7S 175.3W Mw=5.2 EMSC SOUTH OF TONGA
O: 27JUL2026 08:47:18 24.7S 175.4W Mw=5.2 EMSC SOUTH OF TONGA
NEIC reported an earthquake of M 3.0 in Central California was felt with intensity up to II-III in the area(s) of Central California with intensity III in San Juan Bautista, Gilroy and II in San Jose, Oakland, Hollister and Morgan Hill.
O: 27JUL2026 08:13:16 37.0N 121.4W MD=3.0 EMSC CENTRAL CALIFORNIA
O: 26JUL2026 23:45:49 37.0N 121.5W MD=2.4 EMSC CENTRAL CALIFORNIA
O: 27JUL2026 07:01:00 36.6N 121.2W MD=2.4 EMSC CENTRAL CALIFORNIA
NEIC reported an earthquake of M 3.8 in Colrado/New Mexico was felt with intensity up to II-III in the area(s) of Colrado/New Mexico with III in Cimarron, New Mexico and II in Los Animas, Colorado.
This is part of a long sequence of events, without accepted causality, that
have struck near this epicenter since September, 2001. Some of these have
reached magnitudes greater than 5.0. The last earthquake with M>3.8 in this
series occurred on May 7, 2026 with M 4.0 but the last of significantly larger magnitude
in the area was an M 4.3 on June 19, 2023. At the time this summary noted:
"The strongest earthquake in the U.S. or Canada today was an M 4.3 in southern Colorado. It was preceded by an M 3.8 foreshock. The M 4.3 was reported by NEIC to have been felt with intensity IV in Colorado in Trinidad and La Junta and in Capulin, New Mexico. Intensity II-III was also felt in Colorado at Model, Branson, Las Animas, Granada, Denver and in New Mexico at Raton.
The foreshock was reported with intensity IV in Trinidad and Aguilar, Colorado and III in Raton, New Mexico.
The M 4.3 is the strongest earthquake in this series of events since an M 4.3 on March 10, 2023. The series began
several days before September 11, 2001 (trade towers collapse) on September 5, 2001 with an M 4.5 and has continued
off and on since that time. The strongest earthquakes in the area in the past 35 years occurred on
August 22 and 23, 2011 and were accompanied by an M 5.9 in Virginia and Washington
D.C. which did considerable damage and by one of the strongest Gamma Ray Bursts
ever recorded. When the M 4.3 occurred on March 10, 2023, this summary noted
the past history of the area as:
"A moderate earthquake of M 4.3 occurred today in the area of Trinidad, southern Colorado. These were reported by NEIC to have been felt with maximum intensity IV in Colorado in Weston and in Raton, New Mexico and III in Colorado at Aguilar, Trinidad, Walsenburg, Fort Garland, Blanca and in New Mexico at Cimarron and Questa among others.
This swarm which began in September, 2001 several days before the attack on
9-11-2001 of the Trade Center in New York City also is off and on and has been
extensively investigated. No definitive conclusions on the cause of these
earthquakes (or earth disturbances) has been found to this time. Today's M 4.3
occurred within about an hour of local solar midnight and may have been promoted
by high tidal stresses. The last event in this region of M>4 was an M 5.3 on August
23, 2011 and occurred in conjunction with an M 5.8 near Washington D.C. on
the same day which did extensive damage in the Washington area, including
to the National Cathedral and the Washington Monument. This was also associated
with one of the strongest Gamma Ray Bursts (GRB) recorded. The temporal
relation is clear but the physical relation of these events is still fuzzy.
The only other event of M>4.3 in this series occurred as an M 4.9-5.0 on August 10, 2005
and as an M 4.5 on September 5, 2001 with the initial start of these
events. These events occur with approximate 11-year intervals and could
be related to solar cycles of the same length. At the time of the M 5.3
on August 22, 2011, this summary noted:
"Earthquakes of M 5.2-5.4 and M 4.6-5.0 hit southern Colorado near the New Mexico border today.
These events were felt throughout most of Colorado and in much of northern
New Mexico and as far as Kansas, Nebraska, Oklahoma, Texas and Wyoming. The larger event has only two
predecessor earthquakes in Colorado of stronger magnitude in historic times.
One of these was an artificially induced earthquake caused by water injection
which occurred with M 5.4 in the Denver area on October 10, 1960. An earthquake
in 1973 may have occurred in northwestern Colorado with M 5.7 but this is
not listed in the "Seismicity of the United States 1568-1989" and may have
had its epicenter in Wyoming as well where it is given an M 4.8 magnitude. While
a geophysicist with the USGS is reported as stating there was an M 5.7
in Colorado in 1973 this is clearly an error. There is no such event listed
in the definitive catalog of historical Colordao earthquake - "Colorado Earthquake
Data and Interpretations 1967 to 1985" by Kirkham and Rogers.
The only natural event of larger magnitude in Colorado history occurred near Denver on November
8, 1882 and while this event was felt strongly in northern Colorado, it is
possible the epicenter was actually in southern Wyoming.
Initial reports indicated that a few homes were damaged and rockslides hit
highways in the epicenral region.
...
Most of the lighter events in the series today also were felt lightly
in the epicentral zone.
When the light precursor hit the region earlier this morning we discussed
this series of events leading up to today's moderately strong earthquake
in this summary as follows:
"An earthquake of M 2.9 was lightly felt in southern Colorado near the
New Mexican border today. This series of unexplained earthquakes began
exactly 10 years ago in late August (28), 2001 and has continued off and on
since that time. The strongest earthquakes in the sequence typically
occur in August and September with an M 5.0 on August 10, 2005, the largest
to date and an M 4.5 on September 5, 2001 the second to date. The last
event of M>=2.5 in the area was an M 3.8 on May 11, 2011 and an M 3.2
on March 12, 2011 shortly after the great Japanese earthquake. Since today's
event followed a strong aftershock of the Japanese event by about the same
time as the earthquakes in March, some triggering may be considered in
these cases." (August 22, 2011, March 10, 2023, June 19, 2023)
Today's epicenter is located at 24 degrees (node 15) from Chiapas, Mexico and from
the current eye of Hurricane Genevieve and may have been promoted by energy
from those sources.
O: 27JUL2026 06:40:15 36.8N 104.8W MB=3.8 EMSC NEW MEXICO
NEIC reported an earthquake of M 4.4 in Ecuador was felt with intensity up to II-III in the area(s) of Ecuador in El Triunfo.
EMSC reported moderate shaking in Ecuador at Eloy Alfaro, El Triunfo, Guayaquil, Santa Lucia, Chulucanas.
This epicenter is located at 104 degrees from New Zealand and may have been promoted
by energy from that source.
O: 27JUL2026 04:38:56 2.1S 79.8W MB=4.4 EMSC NEAR COAST OF ECUADOR
NEIC reported an earthquake of M 4.5 in Taiwan was felt with intensity up to II-III in the area(s) of Taiwan in Kaohsuing, Southern Taiwan.
An earlier M 4.7 was reported by EMSC to have been felt in Taiwan with moderate
intensity in Keelung, Taipei, Banqiao, Taoyuan, Zhubei, Hsinchu.
Tropical Storm Noul passed over this epicenter one days ago (July 26) and may have
helped promote today's earthquake as noted in previous issues of this summary:
"TS NOUL 2026-07-26 00:00 UT 22.8N 120.8E 75 kts Northern Philippines/Taiwan
TS Noul continued today over the northern Philippines and south of Taiwan with winds up to 75 kts. It is expected to track to the west passing south of Taiwan as a light typhoon around July 25. Some seismic enhancement in the northern Philippines and Taiwan is possible as this storm moves through the area. The antipode at 21S 60W is not a seismic area but as this system moves west the antipode will shift to an area of northern Chile and southern Peru and could trigger a moderate regional earthquakes at that time in that area." (July 26, 2026)
O: 27JUL2026 02:14:49 23.2N 120.5E MB=4.5 EMSC TAIWAN
O: 26JUL2026 12:36:17 24.9N 121.8E MB=4.7 EMSC TAIWAN
NEIC reported a pair of earthquakes of M 5.0 and M 4.9 in the South Atlantic Ocean was not felt in this remote area today.
The second of these (M 4.9) occurred near local solar midnight and may have been promoted
by tidal and/or geomagnetic effects. This is an unusual epicenter for moderate
earthquakes. The only earthquake recorded within about 200 km of this epicenter in the past
35 years with M>=4 was an M 4.4 on June 4, 1999.
This epicenter is located at 80.0 degrees (node nine) from Chiapas and 110 degrees
from New Zealand and at 143 degrees from Mindanao may have been promoted by
energy from those sources.
O: 26JUL2026 22:39:02 22.5S 20.3W MB=5.0 EMSC SOUTH ATLANTIC OCEAN
O: 27JUL2026 02:11:32 22.5S 20.3W mb=4.9 EMSC SOUTH ATLANTIC OCEAN
NEIC reported an earthquake of M 5.3-5.4 in the north Mid- Atlantic Ridge was not felt.
Like the events in the South Atlantic (see above) this epicenter is at 143 degrees
from Mindanao and also at the tenth node (30 degrees) from Venezuela and
may have been promoted by energy from those sources.
O: 26JUL2026 18:19:41 30.0N 42.8W MW=5.3 EMSC NORTHERN MID-ATLANTIC RIDGE
O: 26JUL2026 18:19:40 30.0N 42.8W MW=5.4 NEIC NORTHERN MID-ATLANTIC RIDGE
EMSC reported an earthquake of M 3.9 in Iceland was felt with intensity up to IV in the area(s) of Iceland in Mosfellsbaer, Reykjavik, Selfoss, Seltjarnarnes.
O: 27JUL2026 00:36:17 64.1N 21.3W ML=3.9 EMSC ICELAND
EMSC reported an earthquake of M 3.5 in Spain was felt with intensity up to IV in the area(s) of Spain with moderate intensity in Granada, Armilla, Maracena, Las Gabias, Cajar, Zubia, Cullar-Vega among others.
Several light aftershocks were also felt.
Like the unusual earthquakes today in the southern Mid-Atlantic (see above)
this epicenter is located at 80 degrees from Chiapas (node 9) and may have
been promoted by energy from that source.
O: 26JUL2026 13:39:28 37.1N 3.6W ML=3.5 EMSC SPAIN
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
HURRICANE FAUSTO (06E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR FAUSTO 2026-07-27 00:00 UT 20.0N 143.0W 90 kts Pacific east of Hawaii
Hurricane Fausto (06E) continued today east of Hawaii in the north Pacific Ocean with winds up to 90 kts. It is expected to track to the west over the next several days remaining at hurricane force winds with gusts up to 100 kts but is not expected to significantly affect regional seismicity at this time. It will then make landfall in northern Hawaii around July 29-31, 2026 where some seismic enhancement is likely including the possibility of enhanced volcanism and a moderate earthquake about the time of landfall. The antipode of today's location of Hurricane Fausto is near 20S 37E near the coast of South Africa where some enhanced seismicity is possible.
TROPICAL STORM DOLPHIN (DEPRESSION 12W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS DOLPHIN 2026-07-27 00:00 UT 13.4N 176.8E 45 kts North-central Pacific
TS Dolphin (TD 12W) continued today in the north-central Pacific with winds up to 45 kts. It is expected to track to the west but little seismic enhancement is expected at this time. It will then track towards the Mariana Islands reaching super-typhoon intensity with winds up to 170 kts around August 1. Enhanced seismicity will depend on the path. This could encounter Honshu Japan as a major typhoon in early August and is likely to remain in the super-typhoon category for at least a week due to the unusually warm waters of the Pacific during the current super-El Nino event. It could pose a significant threat to Japanese seismicity as it makes landfall. The antipode is at 13S 4W, a non-seismic area.
HURRICANE GENEVIEVE (07E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR GENEVIEVE 2026-07-27 00:00 UT 14.5N 110.8W 160 kts South of Mexico
Hurricane Genevieve continued today South of Mexico with winds up to 160 kts. It is expected to track to the west but is unlikely to significantly affect regional seismicity at this time. The antipode at 14S 70E is near the South Indian Ridge system - a seismic area in the South Indian Ocean where some enhanced seismicity may occur antipodally to Genevieve.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 26, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0232 0243 0330 M1.0 (July 27, 2026) 5.4E-03 *
South of Tonga M 4.9, 02:42, M 5.0 03:12 UT M 5.2 03:36 UT
Hindu Kush M 4.2 03:09 UT
Chiapas M 4.2 03:30 UT
170 0300 0310 0314 C1.5 (July 26, 2026) 1.6E-03
190 0314 0323 0328 C1.5 (July 26, 2026) 1.4E-03
180 0518 0525 0528 C2.0 (July 26, 2026) 1.2E-03
220 0725 0731 0733 C4.2 (July 26, 2026) 1.3E-03
South Is, New Zealand M 4.1 07:35 UT, M 5.0 07:17 UT
260 1005 1014 1018 C1.9 (July 26, 2026) 1.3E-03
Baja California M 3.3 10:17 UT
Guatemala M 4.2 10:05 UT
270 1348 1357 1404 C1.6 (July 26, 2026) 1.9E-03
290 1404 1409 1411 C1.4 (July 26, 2026) 8.7E-04
280 1517 1528 1532 M3.2 (July 26, 2026) 1.2E-02
Northern Peru M 4.4 15:50 UT
Guatemala M 4.1 15:48 UT
Mindanao M 3.9 15:17 UT M 4.0 15:22 UT
Ionian Sea M 3.4 15:25 UT
320 1957 2011 2026 C1.6 (July 26, 2026) 2.6E-03
Veracruz, Mexico M 4.5 20:16 UT
Caribbean Sea M 3.7 20:15 UT
San Francisco M 2.0 20:55 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: unsettled July 29 active July 27-28. Solar M-flare chance: 45% X-class: 10% proton storm: 5%
AP Indicies: global: 6, high: 7, mid-latitude: 8, time of max k: 11:00-13:00 UT; Max k: 3 Global Kp 2.00 0600-1500, July 26; Sunspot Number: 99; Radio Flux: 148
A moderate excursion in the geomagnetic field as measured at GOES-19 Satellite
magnetometer (at 72 West longitude) occurred starting about 02:43 UT on July 27.
An arcjet maneuver was required to return the satellite to orbit. The arcjet
began about 02:55 and ended 04:25 UT. This excursion was accompanied by an M 4.9
earthquake in Tonga at 02:42 (and others) and followed by an M 5.4 later in the day
in the area of Antofagasta, Chile.
July 26, 2026
Notable earthquakes and events:
It was a quiet day today in global seismicity. No significant earthquakes were
recorded by seismic networks. The largest earthquake since last report in
the world was an M 5.2 in the Tritan da Cunha region of the south Atlantic
Ocean with an M 5.0 in the eastern Andreanof Islands, Aleutians, Alaska the
only other event in the world with M>=5.0 in the past 24 hours.
Neither of these events was reported felt in their respective epicentral areas.
The earthquake in the Andreanof Islands was followed by an aftershock of M 4.0
within a couple of minutes of local solar noon. This may indicate the area
is stresses with the potential for a larger (possibly strong) earthquake
in the next several days. The last earthquake with M>=5.0 within about 200 km of this
epicenter was an M 5.0 occurred on February 10, 2026 with M 5.0 about 200
km west of today's epicenter but the largest within 150 km of this
Andreanof Islands epicenter with M>=5 occurred on December 1, 2025 with M 5.1 but the last of significantly larger magnitude in this area was an M 5.4 on July 16, 2025.
At the time this summary noted:
"The earthquake in the Alaska Peninsula was preceded by an M 5.5 in the central
Aleutians, Alaska. This earthquake was not reported felt. These two events
may be related. This earthquake was reported lightly felt in the general
epicentral area by NEIC." (July 16, 2025)
This epicenter is near 103 degrees from the M 6.7 in New Zealand and may have
been promoted by energy from that source. It is also at the fifth node (72 degrees)
from Chiapas and at the fourth node (90 degrees) from Venezuela and may have
been promoted by energy from those sources as well.
O: 25JUL2026 23:31:42 51.1N 173.2W MB=4.0 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
O: 25JUL2026 21:03:17 51.6N 173.3W mb=5.0 EMSC ANDREANOF ISLANDS, ALEUTIAN IS.
O: 26JUL2026 01:57:11 51.8N 173.3W mb=4.1 EMSC ANDREANOF ISLANDS, ALEUTIAN IS.
The earthquake of M 5.2 in the Tritan da Cunha region of the South Atlantic occurred in the
area of the South Atlantic Geomagnetic anomaly. It is the strongest earthquake
within about 200 km of this epicenter since an M 5.4 on February 10, 2026 - the same
day as an M 5.0 in the Andreanof Islands (see above). The last earthquake
in this area of significantly larger magnitude was an M 5.9 on August 31, 2020. At the time this summary noted:
At the time this summary noted it as:
"An earthquake in the South Atlantic in the Tristan da Cunha region of M 5.9
was also recorded today. The last event within about 300 km of this
epicenter with M>=5.9 was an M 7.0 on June 17, 2015 and an M 6.6 on February 16, 2005." (August 31, 2020)
and
"Seismicity around the world today exploded following the strongest geomagnetic
storm since late October, 2019. Today's activity appeared to be confined to
a series of large events in Ocean Ridges during the first half of the day, but
was followed early on September 1 by strong earthquakes in Atacama Chile of
M 6.8 and 6.3. The Ocean Ridge events occurred on nearly all the world's ocean
ridges including in the Central Atlantic, South Pacific, Indian Ocean and
an M 6.5 in the Central Mid-Atlantic yesterday." (August 31, 2020)
This epicenter is at 102 degrees from New Zealand an Hurricane Genevieve
and may have been promoted by constructive interference from those sources.
It is also at the fourth node (90 degrees) from Chiapas, Mexico and
may have been promoted by energy from that source as well.
O: 26JUL2026 01:32:44 34.1S 14.6W MW=5.2 EMSC TRISTAN DA CUNHA REGION
A swarm of light earthquakes continued in the Brawley area of Southern California
today. The largest of these today were south of this in Baja California with M 3.3 and M 3.2. NEIC reported
These events are occurring at the 13th node (26.6 degrees) from Chiapas
and at 104 degrees from South Island, New Zealand and were probably
promoted by energy from those sources.
O: 26JUL2026 10:17:08 31.5N 115.6W ML=3.3 EMSC BAJA CALIFORNIA, MEXICO
O: 26JUL2026 09:15:30 31.9N 116.7W ML=3.2 EMSC OFFSHORE BAJA CALIFORNIA, MEXI
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake yesterday but the series declined
considerably in intensity over the day. The strongest aftershock today
was an M 4.6. The mainshock was extensively discussed in this summary in previous issues and readers are referred
to those issues for further details as presented at that time.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 26JUL2026 09:38:10 13.5N 92.3W ML=4.1 EMSC OFF THE COAST OF GUATEMALA
O: 25JUL2026 21:36:31 13.8N 92.3W ML=4.3 EMSC OFFSHORE GUATEMALA
O: 26JUL2026 06:42:50 13.8N 93.1W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 09:06:37 13.8N 93.2W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 25JUL2026 09:21:33 13.9N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 25JUL2026 10:01:33 13.9N 93.1W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 25JUL2026 18:18:10 13.9N 93.4W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 07:55:21 13.9N 92.9W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 25JUL2026 09:54:31 14.0N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 25JUL2026 10:05:46 14.0N 93.6W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 25JUL2026 09:58:22 14.1N 93.6W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 10:01:18 14.1N 93.6W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 25JUL2026 07:13:34 14.2N 94.0W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 08:52:33 14.2N 93.3W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 01:20:15 14.3N 93.5W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 26JUL2026 10:04:55 14.4N 92.3W ML=4.6 EMSC OFFSHORE GUATEMALA
O: 25JUL2026 13:47:17 14.8N 93.2W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
NEIC reported an earthquake of M 4.5 in Vancouver British Columbia, Canada was felt with intensity up to II-III in the area(s) of Vancouver British Columbia, Canada near Port McNeill.
O: 25JUL2026 18:33:18 49.5N 129.4W MW=4.5 EMSC VANCOUVER ISLAND, CANADA REGIO
NEIC reported an earthquake of M 2.5 in Northern California was felt with intensity up to II-III in the area(s) of Northern California at Santa Rosa.
O: 25JUL2026 11:31:41 38.5N 122.4W MD=2.5 EMSC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 4.7 in the southern Mid-Atlantic Ridge was not felt in this remote area.
This epicenter - like those yesterday in Vanuatu and New Zealand - is at 101 degrees
from Chiapas, Mexico and may have been promoted by energy from that source.
O: 25JUL2026 06:29:22 56.6S 5.6W MD=4.7 NEIC SOUTHERN MID-ATLANTIC RIDGE
EMSC reported an earthquake of M 4.3 in Southern Iran was felt with intensity up to IV in the area(s) of Southern Iran at Kerman.
O: 26JUL2026 00:16:26 29.6N 56.9E MB=4.3 EMSC SOUTHERN IRAN
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
HURRICANE FAUSTO (06E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR FAUSTO 2026-07-26 00:00 UT 19.3N 138.2W 100 kts Pacific east of Hawaii
Hurricane Fausto (06E) continued today east of Hawaii in the north Pacific Ocean with winds up to 100 kts. It is expected to track to the west over the next several days reaching hurricane force winds by July 25 with gusts up to 100 kts but is not expected to significantly affect regional seismicity at this time. It will then make landfall on Hawaii around July 26-27, 2026 where some seismic enhancement is likely including the possibility of enhanced volcanism and a moderate earthquake about the time of landfall. The antipode of today's location of Hurricane Fausto is near 19S 41E in the South Indian Ocean where some enhanced seismicity is unlikely but possible as this storm moves to the west and intensifies.
TROPICAL DEPRESSION 12W
---- ------- ---------- -------- ----- ------ ------- ---------------
TD 12W 2026-07-26 00:00 UT 12.8N 179.8E 40 kts North-central Pacific
TD 12W formed today in the north-central Pacific with winds up to 40 kts. It is expected to track to the west but little seismic enhancement is expected at this time. It will then track towards the Mariana Islands reaching typhoon leves with winds up to 135 kts around August 1. Enhanced seismicity will depend on the path. The antipode is at 12S 2W, a non-seismic area.
TROPICAL STORM NOUL (11W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS NOUL 2026-07-26 00:00 UT 22.8N 120.8E 75 kts Northern Philippines/Taiwan
TS Noul continued today over the northern Philippines and south of Taiwan with winds up to 75 kts. It is expected to track to the west passing south of Taiwan as a light typhoon around July 25. Some seismic enhancement in the northern Philippines and Taiwan is possible as this storm moves through the area. The antipode at 21S 60W is not a seismic area but as this system moves west the antipode will shift to an area of northern Chile and southern Peru and could trigger a moderate regional earthquakes at that time in that area.
HURRICANE GENEVIEVE (07E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR GENEVIEVE 2026-07-26 00:00 UT 12.5N 107.8W 120 kts South of Mexico
Hurricane Genevieve continued today South of Mexico with winds up to 120 kts. It is expected to track to the west but is unlikely to significantly affect regional seismicity at this time. The antipode at 12S 72E is not a seismic area in the South Indian Ocean.
A tropical cyclone may be forming south of Guerrero, Mexico. This system at 9N 99W is moving to the west and is not expected to impact local seismicity at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 25, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
9960 0130 0141 0146 C1.8 (July 25, 2026) 1.5E-03
Ecuador M 4.0 01:46 UT
9980 0344 0351 0410 C2.0 (July 25, 2026) 3.1E-03
Guatemala M 4.1 03:55 UT
50 0536 0544 0550 C1.9 (July 25, 2026) 1.5E-03
Iceland M 3.0 05:33 UT M 2.9 05:38 UT
160 2123 2136 2145 C1.6 (July 25, 2026) 2.0E-03
Guatemala M 4.3 21:36 UT
Kermadec M 4.9 21:39 UT
Sumatra M 3.9 21:27 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: quiet July 26 active July 27-28. Solar M-flare chance: 45% X-class: 5% proton storm: 5%
AP Indicies: global: 5, high: 6, mid-latitude: 6, time of max k: 11:00-13:00 UT; Max k: 3 Global Kp 2.00 1800-2200, July 25; Sunspot Number: 86; Radio Flux: 145
A moderate geomagnetic storm reached Hp30 index around 3 around 18:00-22:00 UT.
July 25, 2026
Notable earthquakes and events:
A moderate earthquake of M 4.3 occurred in northern Argentina today. NEIC reported
it was likely felt with intensity IV in Argentina near San Antonio de los Cobres.
This earthquake follows a strong activation of the region from Antofagasta,
Chile to northern Argentina and Bolivia. This earthquake is near the
antipode of Tropical Storm Noul and may have been promoted by energy from
that antipodal storm as noted in this and previous issues of this summary:
"TS Noul continued today over the northern Philippines and south of Taiwan with winds up to 75 kts. It is expected to track to the west passing south of Taiwan as a light typhoon around July 25. Some seismic enhancement in the northern Philippines and Taiwan is possible as this storm moves through the area. The antipode at 21S 60W is not a seismic area but as this system moves west the antipode will shift to an area of northern Chile and southern Peru and could trigger a moderate regional earthquakes at that time in that area." (July 24-25, 2026)
It is also the latest in a series of events at the eighth node from Chiapase (45 degrees).
This has been discussed in previous issues of this summary for example as:
"In particular the series referred to in the Antofagasta region of Chile
intensified today with two moderate earthquakes of M 4.2 and 4.1 at 45
degrees from the Chiapas mainshock. This sequence could intensify further
in the next several days and could include events in the region of M>=5.
Today's earthquakes in Antofagasta were reported by NEIC to have been felt with intensity III in Antofagasta.
EMSC reported moderate shaking in Chile at Arica, Tarapaca, Iquique." (July 22, 2026)
This sequence climaxed today with an M 5.1 in Antofagasta, Chile and a second
event of M 5.1 south of this in Atacama, Chile. EMSC reported these events
were felt with moderate intensity in Calama, Chile.
These epicenters are respectively at 44.8 degrees and 46.9 degrees south
of the NEIC Chiapas epicenter and qualify as eighth nodal earthquakes (at 45 degrees).
These illustrate how nodality can be used to help forecast seismic activity." (July 22, 2026)
This epicenter in Argentina occurred at 46 degrees (node 8) from Chiapas
and was likely promoted by energy from that source.
O: 24JUL2026 19:38:42 23.9S 66.7W MW=5.3 EMSC JUJUY, ARGENTINA
A swarm of light earthquakes continued in the Brawley area of Southern California
today. The largest of these today was an M 3.0. NEIC reported
these were being felt with intensity up to III in Brawley and Imperial, California.
These events are occurring at the 13th node (27.6 degrees) from Chiapas
and at 104 degrees from South Island, New Zealand and were probably
promoted by energy from those sources.
O: 25JUL2026 02:08:29 33.1N 116.0W ML=2.1 EMSC SOUTHERN CALIFORNIA
O: 25JUL2026 01:27:20 33.2N 115.6W ML=3.0 EMSC SOUTHERN CALIFORNIA
O: 25JUL2026 01:27:20 33.2N 115.6W ML=3.1 NEIC SOUTHERN CALIFORNIA
O: 25JUL2026 05:21:41 33.2N 115.7W ML=2.3 EMSC SOUTHERN CALIFORNIA
O: 25JUL2026 01:16:52 32.0N 116.3W ML=2.9 EMSC BAJA CALIFORNIA, MEXICO
O: 25JUL2026 01:16:52 32.0N 116.3W ML=3.1 NEIC BAJA CALIFORNIA, MEXICO
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake yesterday but the series declined
considerably in intensity over the day. The strongest aftershock today
was an M 5.1 which occurred near local solar midnight and may have been
promoted by tidal and/or geomagnetic stresses which maximize near this hour.
The mainshock was extensively discussed in this summary in previous issues and readers are referred
to those issues for further details as presented at that time.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 24JUL2026 18:43:19 14.0N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 25JUL2026 02:55:03 14.0N 93.3W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 24JUL2026 10:09:35 14.1N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 24JUL2026 13:57:39 14.1N 93.5W ML=4.5 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 25JUL2026 07:13:34 14.2N 94.0W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 24JUL2026 10:25:49 14.3N 93.7W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 25JUL2026 04:44:30 14.3N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 25JUL2026 05:57:03 14.3N 92.9W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 25JUL2026 05:26:33 14.5N 92.8W Mw=5.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 24JUL2026 09:37:05 14.9N 93.7W mb=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 24JUL2026 09:20:26 15.0N 93.4W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 24JUL2026 22:08:01 15.0N 93.0W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 24JUL2026 21:57:14 14.0N 93.4W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
The strongest earthquake in the world today was an M 6.0 in northern Vanuatu.
It was reported by NEIC to have been felt in the epicentral area with IV in Luganville, Sanma. The last earthquake in northern
Vanuatu within about 200 km of this epicenter occurred as an M 7.3 on March 30, 2026
At the time this summary noted:
"A strong excursion in the GOES 18 magnetometer occurred beginning about 06:20 UT on March 30 and continued through about 09:30 UT. This
involved a near doubling of the geomagnetic field strength from low value to high value
from 06:30 to 07:00 UT. The M 7.3 in Vanuatu occurred during this excursion
and may have been promoted by it.
...
A major earthquake of M 7.3 followed the X1.4 flare (see above) by several hours in the
area of Vanuatu. Tsunami waves were not expected nor observed with this earthquake. NEIC reported it was felt with intensity VI in Sanma, Vanuatu at Port Olry, Luganville, V in Longana Oenama; IV in Vile Shefa, Isangel Tafea and III in Lakatoro, Malampa and II in New Caledonia at Noumea and Houailu. It was preceded by an M 5.4 foreshock about 6 seconds earlier. EMSC reported moderate shaking in Port Vila, Vanuatu and in Bouloupari, Monte-Dore and Noumea New Calenonia. This is the second strongest earthquake in the world during
2026 (following an M 7.5 in Tonga on March 24, 2026. It occurred at a longitude
which was exactly at local noon when the C1.6 flare hit and near local noon
at the beginning of the X1.4 flare and was probably promoted by SFE from
those flares. Other major events in the past half year have occurred with M 7.4 and M 7.7
on October 10, 2025 in Mindanao and the Drake Passage and on December 8, 2025 with M
on December 8, 2025 in Hokkaido, Japan.
The last earthquake in Vanuatu within about 250 km of this epicenter with M>=7.3
occurred on December 17, 2024 about 200 km south of today's epicenter. Other
earthquakes in the area since 1990 occurred as an M 7.3 on August 10, 2010
and M 7.5 on November 25, 1999." (March 30, 2026)
Today's earthquake in Vanuatu and an event of M 5.7-6.3 in North Island, New Zealand
are the first events of M>=6 in the world since the M 7.3 in Chiapas, Mexico
of July 17, 2026.
So it may be significant that these epicenters in Vanuatu and New Zealand lie at 102-103 degrees from Chiapas, Mexico and may have
been promoted by energy from that source.
This epicenter is at 103 degrees from New Zealand; at the eighth node (46 degrees) from Venezuela and at the 16th node (24 degrees) may have been promoted
by energy from those sources.
O: 24JUL2026 22:39:19 13.9S 167.5E MB=4.9 EMSC VANUATU
O: 24JUL2026 21:19:47 14.0S 166.9E Mw=5.3 EMSC VANUATU
O: 24JUL2026 21:37:55 14.0S 166.8E Mw=6.0 EMSC VANUATU
An earthquake of M 5.7 (NEIC) to 6.3 (GeoNet) also occurred in North Island, New Zealand about 5 hours
before the event in Vanuatu. This is the strongest shallow focus earthquake
in New Zealand within about 200 km of this epicenter since an M 5.7 on July 7, 2021 and an M 5.7 on
April 11, 1993. At the time of the the event in July, 2012 this summary noted:
"This is the largest earthquake located by NEIC in the North Island of New Zealand during 2012 after an M 4.8 on March 30.
The last earthquake of M>=5 in the area occurred nearly exactly a year ago
as an M 5.3 on July 5, 2011 about 70 km north of today's epicenter." (July 7, 2012)
Like the following M 6.0 in Vanuatu to the north this epicenter is also at 102 degrees from
Chiapas, Mexico. EMSC reported it was felt in North Island, New Zealand
at Hamilton, N.Z.
GeoNet reported nearly 23,000 prople reported feeling this quake with the following data for this event.
O: 24JUL2025 16:51:36 39.0S 175.2E MB=6.3 GEONET 22942 people reported feeling this earthquake with 6494 at weak intensity and 9054 with light shaking and 6166 with moderate intensity 1063 with strong, 138 with severe and 27 with extreme intensity.
O: 24JUL2026 16:51:37 39.0S 175.2E MW=5.7 EMSC NORTH ISLAND OF NEW ZEALAND
O: 24JUL2026 16:51:36 39.0S 175.2E MB=6.3 IGNS NORTH ISLAND OF NEW ZEALAND
O: 24JUL2026 17:03:19 39.0S 175.2E ML=3.0 EMSC NORTH ISLAND OF NEW ZEALAND
O: 24JUL2026 17:21:50 39.0S 175.2E ML=3.7 EMSC NORTH ISLAND OF NEW ZEALAND
O: 24JUL2026 20:34:51 39.0S 175.2E ML=3.2 EMSC NORTH ISLAND OF NEW ZEALAND
NEIC reported an earthquake of M 4.4 in Colombia was felt with intensity up to II-III in the area(s) of Colombia in Bucaramanga, Santander.
O: 25JUL2026 06:29:17 3.9N 78.7W MB=4.4 EMSC SOUTH OF PANAMA
NEIC reported an earthquake of M 5.7 in the Drake Passage may have been felt with intensity up to II-III in the area(s) of the Drake Passage in Ushuaia, Argentina.
This epicenter is located near the fifth node (72 degrees) from Chiapas, Mexico
and may have been promoted by energy from that source.
O: 24JUL2026 23:10:29 57.4S 67.0W MB=5.7 EMSC DRAKE PASSAGE
NEIC reported an earthquake of M 4.4 in Southern Italy was felt with intensity up to II-III in the area(s) of Southern Italy in Salle, Abruzzen, Pontelatone, Campania, Picinisco, Lazio and II in Atina.
EMSC reported moderate shaking in Italy at Alfedena, Picinisco, Castel di Sangro, Rivisondoli, Capriati A Volturno, Bamerale, Sora, Arpino, Isola del Liri, Pacentro, Sulmona among others.
This follows an M 4.7 in Sicily Italy and an M 4.4 in Austria reported
in the previous issues of this summary as:
"Two unusual moderate earthquakes occurred today in Europe. The strongest
of these was an M 4.7 in Sicily, Italy at a deep focal depth of 243 km.
It was not reported by NEIC to have been felt due to its depth. It occurred
within a couple of minutes of local solar midnight and may have been
promoted by tidal and/or geomagnetic stresses which maximize near this hour.
The last earthquake in Sicily within about 150 km of this epicenter with M>=4.7
occurred on June 1, 2026 with M 6.2. Today's event appears to be an aftershock
of that mainshock.
...
This epicenter is located at the fourth node (90 degrees) from Chiapas, and was probably
promoted by energy from that source." (July 24, 2026)
This epicenter is near the fourth node (90 degrees) from Chiapas, Mexico
and may have been promoted by energy from that source.
O: 24JUL2026 22:08:15 41.7N 14.0E MW=4.2 EMSC SOUTHERN ITALY
EMSC reported an earthquake of M 4.9 in Southern Sumatra was felt with intensity up to IV in the area(s) of in Southern Sumatra in Biha.
O: 24JUL2026 17:28:06 5.7S 103.8E MB=4.9 EMSC SOUTHERN SUMATRA, INDONESIA
EMSC reported an earthquake of M 5.1 in Kamchatka, Russia was felt with intensity up to IV in the area(s) of Kamchatka, Russia in Vilyuchinsk, Paratunka, Petropavlovsk-Kamchatsky.
This epicenter is at 90.0 degrees from Chiapas, Mexico and was likely promoted
by energy from that source.
O: 24JUL2026 16:33:19 51.7N 158.0E MB=5.1 EMSC NEAR EAST COAST OF KAMCHATKA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
HURRICANE FAUSTO (06E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR FAUSTO 2026-07-24 00:00 UT 19.0N 134.2W 100 kts Pacific east of Hawaii
Hurricane Fausto (06E) continued today east of Hawaii in the north Pacific Ocean with winds up to 100 kts. It is expected to track to the west over the next several days reaching hurricane force winds by July 25 with gusts up to 100 kts but is not expected to significantly affect regional seismicity at this time. It will then make landfall on Hawaii around July 25-26, 2026 where some seismic enhancement is likely including the possibility of enhanced volcanism and a moderate earthquake about the time of landfall. The antipode of today's location of Hurricane Fausto is near 19S 45E in the South Indian Ocean where some enhanced seismicity is unlikely but possible as this storm moves to the west and intensifies.
TROPICAL STORM NOUL (11W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS NOUL 2026-07-24 00:00 UT 21.8N 119.8E 75 kts Northern Philippines
TS Noul continued today over the northern Philippines and south of Taiwan with winds up to 75 kts. It is expected to track to the west passing south of Taiwan as a light typhoon around July 25. Some seismic enhancement in the northern Philippines and Taiwan is possible as this storm moves through the area. The antipode at 21S 60W is not a seismic area but as this system moves west the antipode will shift to an area of northern Chile and southern Peru and could trigger a moderate regional earthquakes at that time in that area.
HURRICANE GENEVIEVE (07E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR GENEVIEVE 2026-07-24 00:00 UT 11.5N 104.8W 75 kts South of Mexico
Hurricane Genevieve formed today South of Mexico with winds up to 75 kts. It is expected to track to the west but is unlikely to significantly affect regional seismicity at this time. The antipode at 11S 75E is not a seismic area in the South Indian Ocean.
A tropical cyclone may be forming south of Guerrero, Mexico. This system at 9N 99W is moving to the west and is not expected to impact local seismicity at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 23, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
9760 0005 0009 0012 C1.5 (July 24, 2026) 6.9E-04
Rat Is. M 3.7 00:08 UT
Austria M 4.4 23:59 UT
9810 0358 0405 0408 C1.8 (July 24, 2026) 1.0E-03
9820 0414 0427 0436 C2.4 (July 24, 2026) 2.9E-03
9830 0639 0647 0700 C1.8 (July 24, 2026) 2.1E-03
9900 2052 2105 2113 C2.6 (July 24, 2026) 2.7E-03
Vanuatu M 5.3 21:19 UT M 6.0 21:37 UT
Baja Caliornia M 3.0 21:15 UT
9910 2146 2203 2218 C3.0 (July 24, 2026) 5.1E-03
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: disturbed July 25 quiet July 26 active July 27. Solar M-flare chance: 45% X-class: 5% proton storm: 5%
AP Indicies: global: 9, high: 6, mid-latitude: 9, time of max k: 00:00-03:00 UT; Max k: 4 Global Kp 4.00 0000-0300, July 24; Sunspot Number: 101; Radio Flux: 150
A strong excursion in the strength of the geomagnetic field was measured at
the GOES 18 magnetometer beginning about 18:30 UT on July 24, 2026. This resulted in a required
arcjet to correct the orbit of that satellite. This operation was concluded
by 20:10 UT when normal operations continued. Earthquakes of M 4.5 in the Izu Islands, Japan
and M 4.3 in Chiapas, Mexico coincided with this geomagnetic event at 18:43 UT
near local solar noon in Chiapas and may have been related to it.
A minor geomagnetic storm occurred at this time reaching a maximum Hp30 (Kp) of
3.66 between 18:30 and 19:00 UT (GFZ) with sudden commencement around 18:43 UT.
July 24, 2026
Notable earthquakes and events:
A strong enhancement in the geomagnetic field recorded on the GOES-19 magnetometer
began about 02:40 UT on July 24. It lasted as a geomagnetic pulse until about 02:55 UT.
An arcjet maneuver was then performed returning GOES-19 to it original orbit
and normal operations returned by 04:21 UT. This was the strongest electromagnetic
pulse recorded at GOES satellites in some time. This type of event has been
followed in this summary for months as it is often accompanied by a significant
earthquake. So it should come as no surprise to readers of this summary
that a significant earthquake of M 4.8 occurred in Puerto Rico at 02:42 UT
at the start of this geomagnetic field excursion. GOES-19 is in a stationary
orbit at 72 West longitude while the event in Puerto Rico is at 68 West longitude
so the satellite was measuring the field over the site of the earthquake.
NEIC reported this earthquake was widely felt in Puerto Rico and the Dominican Republic with IV in Puerto Rico at Utuado, Lajas and Adjuntas and III in Cabo Rojo, Lares, Barranquitas, Ciales, Comerio, Aguas Buenas, Mayaguez, Anasco, Aguada, Arroyo, Carolina, San Juan, among others and in the Dominican Republic with III in Santo Domingo, Miches, Boca de Yum, Otra Banda, La Altagracia.
This is a significant earthquake. A foreshock of M 3.1 was also felt two hours earlier with intensity II in Mayaguez and Aguadilla. The last earthquake in Puerto Rico within
about 200 km of today's epicenter with M>=4.8 occurred on June 26, 2026 with M 5.0
and prior to that as an M 5.1 on February 19, 2026. The the last shallow focus
earthquake of significantly larger magnitude was an M 5.7 on June 24, 2025.
At the time of the June, 2026 quake ( which followed a similar arcjet maneuver on
GOES 18 on June 26) this summary noted:
"NEIC reported an earthquake of M 5.0 in the Dominican Republic was felt with intensity up to II-III in the area(s) of the Dominican Republic with IV in Puerto Rico at Utuado, III in Anasco, Aguada, San Juan, Guaynabo, Arroyo, and Rincon.
EMSC reported moderate shaking in the Dominican Republic at La Romana, Punta Cana, Salvaleon de Higuey, Otra Banda, Hato Mayo del Rey, Boca Chica, Guerra, Santo Domingo, and in Puerto Rico in Mayaguez among others. It
was reported as far as 300 km from the epicenter.
This earthquake occurred within minutes of local solar noon at a latitude
which was near sub-solar at the time and may have been promoted by tidal
and/or geomagnetic stresses. The last earthquake in the Dominican Republic
within about 200 km of this epicenter with M>=5 occurred as an M 5.7 on August 5, 2025 and
one year ago on June 24, 2025 also with M 5.7. At the time this summary noted:
"An M 5.7 earthquake was widely felt in the areas of the Dominican Republic and Puerto Rico today. NEIC reported maximum intensity IV in Puerto Rico at Adjuntas, Aguada, Auadilla, Cabo Rojo, Utuado and III in Anasco, Arecibo, Camuy, Barceloneta and Castaner.
An M 4.5 aftershock occurred which was felt with loud rumbling in Dominican Republic at Otra Banda and Punta Cana and strongly in Ponce, Puerto Rico (EMSC data).
A foreshock of M 3.9 was felt with intensity IV in Otra Banda Dominican Republic and III in Puerto Rico at Ponce, Cayey, San Juan, Guaynabo, and Carolina.
This event occurred near local solar midnight and may have been promoted by
tidal and/or geomagnetic stresses which maximize near this hour. The epicenter
is near sub-solar at this time of June. This has not been lost to this
audience in the past several days as it was reported:
"Because of its location near the Tropic of Capricorn, Mexico is no stranger to
major earthquakes near the summer solstice when the sun is directly overhead.
Such events occurred in 1897 (M 7.0); 1916 (M 7.1); 1928 (M 8.0) and 1982 (M 7.2)
among others. This relation had been noted in the previous issues of this report as:
"On the first day of summer in the northern hemisphere, the sun reaches its zenith at about 23 degree North latitude
due to the tilt of the earth's axis. Vertical tidal triggering is therefore
maximized near 23 North latitude at this time of year. Seismicity can be
seen to increase at this latitude as well as evidenced by today's India earthquake at 23 North
latitude ... (June 22, 2020, June 19, 2025, June 24, 2025, June 26, 2026)
Today's earthquake in Puerto Rico is also near the sub-solar latitude for
July 23 and may be considered a sub-solar event.
Today's epicenter in Puerto Rico is at 24.8 degrees from Chiapas, Mexico event
of M 7.3. This is the 14th nodal distance (24.7 degrees) and may indicate
a substantial effect on the region from Chiapas.
O: 24JUL2026 02:42:34 18.9N 67.3W MW=4.8 EMSC PUERTO RICO REGION
O: 24JUL2026 00:55:18 19.0N 67.2W MD=3.1 EMSC PUERTO RICO REGION
Two unusual moderate earthquakes occurred today in Europe. The strongest
of these was an M 4.7 in Sicily, Italy at a deep focal depth of 243 km.
It was not reported by NEIC to have been felt due to its depth. It occurred
within a couple of minutes of local solar midnight and may have been
promoted by tidal and/or geomagnetic stresses which maximize near this hour.
The last earthquake in Sicily within about 150 km of this epicenter with M>=4.7
occurred on June 1, 2026 with M 6.2. Today's event appears to be an aftershock
of that mainshock. At the time this summary noted it as:
"A strong M 6.2 earthquake hit near the coast of southern Italy today at a depth
of 243 km. NEIC reported it was widely felt throughout southern Italy with IV in Calbria and Apulien at Rose, Amantea, Simeri Crichi, Adelfia, Brancaleone, Botricello, Malera, Sovarato and Tropea and in Caltagirone, Sicily, Italy.
EMSC reported moderate to strong shaking in Italy at Torremezzo di Falconara, Paola, Scarcelli, Mendicono, Flaerna Scalo, Cosenza, Arcavacata, Quattromiglia, Settimo, Platania, Lamezia Terme, Tropea, Santa Domenica, Maida, San Nicolo, San Costantino Alabro, San Demetrio Corone, Vallelonga, Siano, Scalea, San Nicola Arcella, Staletti, and as far as 350 km in Albania, at Vlore in Greece at Corgu, in Malta at Gzira, it was also felt lightlyin Croatia, Montenegro, Bosnia and Herzegovina, Algera, Liechtenstein, among others.
No tsunami was expected nor observed. This is the strongest earthquake in southern Italy within about 200 km of this
epicenter in at least 35 years. The last significant earthquake in this
region of Italy was an M 6.0 about 200 km northwest of today's epicenter
on March 9, 2026. ..." (June 1, 2026)
This epicenter is located at the fourth node (90 degrees) from Chiapas, and was probably
promoted by energy from that source.
O: 23JUL2026 22:55:57 38.9N 15.5E ML=4.5 EMSC SICILY, ITALY
O: 23JUL2026 22:55:57 39.0N 15.4E ML=4.7 NEIC SICILY, ITALY
The second moderate earthquake in Europe today was an M 4.4 in Austria about
an hour after the Sicily earthquake (see above). NEIC reported it was felt in Austria with intensity V in Reichenau; IV in Murzzuschlag; III in Neunkirchen, Rust, Vienna and II in Graz, Berndorf, Kindberg and in Sopron, Hungary and Rozdrojovice, Czech Republic.
EMSC reported moderate shaking and a loud noise in Austria at Semmering, Schottwien, Trattenbach, Gloggnitz, Stuppach, Ganz, Murzzuschlag, Kapellen, Monichkirchen, Warth, among others. Also reported felt as far as Switzerland, Croatia, Czechia, Slovenia, Slovakia, Hungary.
The last earthquake within about 150 km of this epicenter in Austria with
M>=4.4 occurred on July 21, 2003 with M 4.7. An M 4.5 also occurred about 200
km south of today's epicenter on August 13, 2024. At the time this summary noted:
"NEIC reported this earthquake of M 4.5 in Croatia was felt with intensity up to VI in the area(s) of Croatia in Rasinja and V in Ludbreg." (August 13, 2024)
Today's epicenter is located at the fourth node (90 degrees) from Chiapas, and was probably
O: 23JUL2026 23:59:07 47.7N 15.8E ML=4.4 EMSC AUSTRIA
The strongest earthquake in the world today was an M 5.8 in the Molucca Sea, Indonesia.
NEIC reported it was felt with intensity IV in Manado, Sulawesi, Indonesia.
This epicenter is at the sixth node (60 degrees) from New Zealand and 140
degrees from Chiapas and may have been promoted by energy from those sources.
O: 23JUL2026 22:58:35 0.7N 126.3E MW=5.8 EMSC MOLUCCA SEA
The most notable earthquake of the day was an M 5.0 in the Texas Panhandle. NEIC
reported it was widely felt in Texas, Oklahoma, Kansas, and as far as Colorado.
NEIC reported likely shaking up to VII in the epicentral area with reports
of intensity V in Miami, Texas and IV in Texas at Spearman, Gruver, Pampa, Stinnett, Shamrock, Canadian, White Deer, Amarillo; in Kamsas at Larned, Ashland, Salina, and in Oklahoma at Vici, Shattuck, Gould.
Intensity III was reported within about 300 km of the epicenter throughout
Texas and Oklahoma and II as far as 500 km away in Dallas (among other), Texas.
Hurricane Bertha, the first Gulf of Mexico/America storm of the season
made landfall on the coast of Louisiana and Texas at about 10:00 UT on
July 23, coincident with this earthquake in the Texas Panhandle. Stresses
from this landfall of Bertha probably were the main triggers for this coincident
in Texas. This summary has followed the progress of Bertha in previous issues
for example as:
"TS BERTHA 2026-07-21 00:00 UT 29.3N 87.9W 50 kts South of Florida
TS Bertha (02L) continued today south of Florida (US) in the northern Gulf of America (Mexico) with winds up to 50 kts. It is expected to track to the west over the next several days but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Bertha is near 29S 92E in the South Indian Ocean where enhanced seismicity is unlikely at this time. Landfall is expected in two days near New Orleans, Louisiana." (July 21, 2026)
This is the strongest earthquake within about 200 km of this epicenter in
the Texas Panhandle in more than 35 years and matches the strongest earthquake
every recorded in this area - an M 5.0 on July 30, 1925. An M 5.1 occurred about 300 km to the
east of this on February 13, 2016 in Oklahoma.
This forecast had expected today's event at a lower magnitude was likely around
July 24, 2026 in forecast 184150 as follows:
O: 23JUL2026 10:21:43 35.9N 101.0W ML=5.0 NEIC TEXAS PANHANDLE
P: 24JUL2026 184150 35.4N 101.8W 2.0-4.1 AAAAA SW U.S.A
The area has begun to show signs of unrest in recent years however. The last earthquake
in this area with M>=4 for example occurred as an M 4.3 on April 14, 2021.
At the time this summary noted:
"Two unusual earthquakes occurred today in the region of northern Texas.
This activity is at 100-104 degrees from the major and great eartquakes
in the Loyalty Islands, Kermadec Islands and North Island, New Zealand of
February and March , 2021 and was likely promoted by energy from that source.
The largest of these, and the strongest in the U.S. or Canada was an M 4.3 which hit the Texas Panhandle today. NEIC reported it was felt with intensity IV in Miami, Texas and II-III in Borger, Skellytown, Pampa, Perryton, Groom, Amarillo, and possibly as far as Axtell, Nebraska.
This is the strongest earthquake within about 200 km of this epicenter in at
least 30 years. The only earthquake in this area of larger magnitude in the
past 50 years was an M 4.5-4.6 on February 15, 1974. The strongest quake in this
area on record is an M 5.0 on July 30, 1925." (April 14, 2021)
This epicenter is at 22.4 degrees from the NEIC position of the epicenter
of the M 7.3 Chiapas earthquake (the 16th node is at22.5 degrees). Readers
are aware that a number of significant earthquakes in the past several days
have been occurring at the eighth node (45 degrees) from Chiapas, so the
distance of 22.5 degrees (node 16) or half of that is probably quite important
and this earthquake in Texas was likely promoted by energy from Chiapas.
This earthquake is also at the third node (120 degrees) from Mindanao, Philippines
and may have been promoted by energy from that source.
O: 23JUL2026 10:21:43 35.9N 101.0W ML=5.0 NEIC TEXAS PANHANDLE
An earthquake of M 3.9 also occurred in the active area of the Permian Basin
in Western Texas today. NEIC reported it was felt with intensity III in Texas at Big Spring and II in Gail.
The stresses associated with the lanfall of TS Bertha that affected the Texas Panhandle today also
probably helped promote this earthquake.
O: 23JUL2026 17:15:27 32.5N 101.2W ML=3.6 EMSC WESTERN TEXAS
O: 23JUL2026 17:15:27 32.5N 101.2W ML=3.9 EMSC WESTERN TEXAS
The earthquake in the Texas Panhandle followed 51 minutes after an M 5.1 in the eastern Andreanof Islands,
Alaska. Several reflected P-phases were in the area of Texas from Alaska
at the time of the earthquake in Texas, but it is unlikely they triggered it.
This epicenter in Alaska is at the fourth node (90 degrees) from Venezuela and
at the fifth node (72 degrees) from Chiapas and may have been promoted by
energy from those sources.
O: 23JUL2026 09:30:18 51.6N 173.6W ML=5.1 NEIC ANDREANOF ISLANDS, ALASKA
O: 23JUL2026 06:51:06 51.6N 172.9W mb=4.6 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
O: 24JUL2026 01:03:20 51.2N 176.1W MB=5.0 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
A swarm of light earthquakes occurred in the Brawley area of Southern California
today. The largest of these at this writing was an M 3.6. NEIC reported
these were being felt with intensity up to III in Brawley and Imperial, California.
These events began within a couple of minutes of local solar midnight and may
have been promoted by tidal and/or geomagnetic stresses which maximize near
this hour.
These events are occurring at the 13th node (27.6 degrees) from Chiapas
and at 104 degrees from South Island, New Zealand and were probably
promoted by energy from those sources.
O: 23JUL2026 07:14:20 32.9N 115.5W ML=3.0 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 07:15:08 32.9N 115.5W ML=2.0 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 07:16:28 32.9N 115.5W ML=2.1 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 07:31:41 32.9N 115.5W ML=3.1 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 07:31:48 32.9N 115.5W Mw=3.6 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 08:27:37 32.9N 115.5W ML=2.1 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 08:44:53 32.9N 115.5W ML=2.3 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 08:49:11 32.9N 115.5W ML=3.2 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 08:52:35 32.9N 115.5W ML=2.2 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 08:55:06 32.9N 115.6W ML=2.7 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 08:57:46 32.9N 115.5W ML=2.1 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 08:59:47 32.9N 115.5W ML=2.1 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 09:03:52 32.9N 115.5W ML=2.7 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 09:09:16 32.9N 115.5W ML=2.0 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 09:24:34 32.9N 115.5W ML=2.4 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 10:14:17 32.9N 115.5W ML=2.0 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 16:24:28 32.9N 115.6W ML=3.2 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 23:40:37 33.7N 116.8W ML=2.1 EMSC SOUTHERN CALIFORNIA
Far-field triggering of earthquakes from Chiapas, Mexico, South Island New Zealand and Venezuela continued unabated
today. Most of the largest earthquakes of the day occurred at nodal distances
from Chiapas and had been expected in this sequence. In the previous issue of this
summary this had been discussed in part as:
NEIC reported an earthquake of M 5.1 in the Central Mid-Atlantic was not felt.
This epicenter is at the seventh node (52 degrees) from Chiapas, Mexico and
may have been promoted by energy from that source.
O: 23JUL2026 06:29:57 8.5N 39.4W Mw=5.1 EMSC CENTRAL MID-ATLANTIC RIDGE
O: 23JUL2026 06:30:12 10.0N 41.0W Mw=4.9 EMSC CENTRAL MID-ATLANTIC RIDGE
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake yesterday but the series declined
considerably in intensity over the day. The mainshock was extensively
discussed in this summary in previous issues and readers are referred
to those issues for further details as presented at that time.
Following is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 23JUL2026 08:44:50 13.6N 93.0W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 23JUL2026 13:13:59 13.8N 92.3W mb=4.9 EMSC OFFSHORE GUATEMALA
O: 23JUL2026 08:28:22 13.9N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 23JUL2026 12:04:47 13.9N 92.3W mb=4.5 EMSC OFFSHORE GUATEMALA
O: 23JUL2026 23:21:05 13.9N 93.3W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 24JUL2026 04:28:29 13.9N 93.2W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 23JUL2026 10:51:28 14.0N 93.2W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 23JUL2026 20:28:21 14.0N 93.2W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 23JUL2026 22:39:03 14.0N 93.4W mb=4.5 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 23JUL2026 23:00:11 14.0N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 23JUL2026 20:53:57 14.1N 93.4W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 23JUL2026 21:26:33 14.1N 93.2W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 23JUL2026 23:03:55 14.1N 93.5W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 23JUL2026 23:11:11 14.1N 93.1W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 23JUL2026 06:47:20 14.2N 93.7W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 23JUL2026 08:06:46 14.2N 93.4W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 24JUL2026 05:21:10 14.2N 93.1W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 23JUL2026 22:07:26 14.4N 93.3W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 23JUL2026 15:29:58 14.6N 93.4W mb=4.5 EMSC OFFSHORE CHIAPAS, MEXICO
NEIC also reported earthquakes of M 4.7 and M 4.4 in the Santa Cruz Islands and southern Vanuatu respectively was not felt.
This epicenter lies at 103 degrees from Chiapas, Mexico and may have
been promoted by energy from that source.
O: 23JUL2026 14:12:57 11.9S 166.5E MB=4.7 EMSC SANTA CRUZ ISLANDS
O: 23JUL2026 13:21:48 20.1S 168.8E MB=4.4 EMSC LOYALTY ISLANDS
NEIC reported an earthquake of M 4.2 in the Gulf of California was not felt.
This epicenter is at 103 degrees from New Zealand; at the eighth node (46 degrees) from Venezuela and at the 16th node (24 degrees) may have been promoted
by energy from those sources.
O: 23JUL2026 02:01:05 30.3N 113.7W ML=4.2 EMSC GULF OF CALIFORNIA
NEIC reported an earthquake of M 2.7 in San Francisco, California was felt with intensity up to II-III in the area(s) of San Francisco, California with IV in Hayward and III in Oakland, San Leandro, Castro Valley.
O: 23JUL2026 21:20:23 37.9N 122.3W MD=2.1 EMSC SAN FRANCISCO BAY AREA, CALIF.
NEIC reported an earthquake of M 4.6 in Colombia was felt with intensity up to II-III in the area(s) of Colombia in Bucaramanga, Santander.
O: 23JUL2026 17:50:29 6.7N 73.1W MB=4.6 EMSC NORTHERN COLOMBIA
EMSC reported an earthquake of M 4.1 in Central Turkey was felt with intensity up to IV in the area(s) of Central Turkey in Malatya, Gaziantep.
O: 23JUL2026 07:26:44 38.4N 37.9E MW=4.1 EMSC CENTRAL TURKEY
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
HURRICANE FAUSTO (06E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR FAUSTO 2026-07-24 00:00 UT 18.5N 129.2W 100 kts Pacific east of Hawaii
Hurricane Fausto (06E) continued today east of Hawaii in the north Pacific Ocean with winds up to 100 kts. It is expected to track to the west over the next several days reaching hurricane force winds by July 24 with gusts up to 100 kts but is not expected to significantly affect regional seismicity at this time. It will then make landfall on Hawaii around July 25-26, 2026 where some seismic enhancement is likely including the possibility of enhanced volcanism and a moderate earthquake about the time of landfall. The antipode of today's location of Hurricane Fausto is near 18S 51E in the South Indian Ocean where some enhanced seismicity is unlikely but possible as this storm moves to the west and intensifies.
HURRICANE BERTHA (02L)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR BERTHA 2026-07-24 00:00 UT 30.3N 93.9W 50 kts Texas/Louisiana
TS Bertha (02L) dissipated today in the central Texas after making landfall near the Louisiana/Texas border early on July 23 with winds up to 50 kts. It then tracked to the west and made a second landfall on the Texas coast later on July 23. Seismicity in Texas and Louisiana could be further enhanced by this landfall event especially in western Texas and New Mexico. The antipode of today's location of Hurricane Bertha is near 30S 86E in the South Indian Ocean where enhanced seismicity is unlikely at this time. Landfall is expected in two days near New Orleans, Louisiana.
TROPICAL STORM NOUL (11W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS NOUL 2026-07-24 00:00 UT 18.8N 121.8E 55 kts Northern Philippines
TS Noul formed today over the northern Philippines and south of Taiwan with winds up to 55 kts. It is expected to track to the west passing south of Taiwan as a light typhoon around July 25. Some seismic enhancement in the northern Philippines and Taiwan is possible as this storm moves through the area. The antipode at 19S 58W is not a seismic area but as this system moves west the antipode will shift to an area of northern Chile and southern Peru and could trigger a moderate regional earthquakes at that time in that area.
A tropical cyclone may be forming south of Guerrero, Mexico. This system at 9N 99W is moving to the west and is not expected to impact local seismicity at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 23, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
9440 0136 0141 0147 C1.2 (July 23, 2026) 8.6E-04
Antofagasta M 4.7 01:56 UT
Gulf of California M 4.2 02:01 UT
9460 0249 0253 0257 C1.7 (July 23, 2026) 8.3E-04
Northern Peru M 4.6 02:55 UT
9470 0303 0312 0314 C1.5 (July 23, 2026) 1.4E-03
Papua M 4.0 03:04 UT
Southern Idaho M 3.2 03:13 UT
Mexico M 3.9 03:09 UT
9510 0314 0318 0324 C2.0 (July 23, 2026) 1.6E-03
Idaho M 3.2 03:12 UT
9520 0324 0327 0329 C5.3 (July 23, 2026) 1.5E-03
9530 0638 0644 0647 C1.3 (July 23, 2026) 7.3E-04
Chiapas M 4.0 06:47 UT
Tanimbar M 3.9 06:42 UT
Andreanof Is. M 4.6 06:51 UT
9600 0957 1002 1007 C1.3 (July 23, 2026) 7.9E-04
9650 1431 1512 1527 C2.8 (July 23, 2026) 6.7E-03
9670 1645 1652 1655 C1.9 (July 23, 2026) 1.0E-03
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: minor storms July 24 disturbed July 25-26. Solar M-flare chance: 55% X-class: 10% proton storm: 5%
AP Indicies: global: 22, high: 28, mid-latitude: 15, time of max k: 18:00-20:00 UT; Max k: 6 Global Kp 5.33 1800-2000, July 23; Sunspot Number: 63; Radio Flux: 150
A G1 geomagnetic storm with Kp up to 5.33 occurred late on the UT day of July 23
This is the strongest geomagnetic storm since planetary A-index reached 75 on July 4, 2026.
July 23, 2026
Notable earthquakes and events:
The most notable earthquake of the day was an M 5.0 in the Texas Panhandle. NEIC
reported it was widely felt in Texas, Oklahoma, Kansas, and as far as Colorado.
NEIC reported likely shaking up to VII in the epicentral area with reports
of intensity V in Miami, Texas and IV in Texas at Spearman, Gruver, Pampa, Stinnett, Shamrock, Canadian, White Deer, Amarillo; in Kamsas at Larned, Ashland, Salina, and in Oklahoma at Vici, Shattuck, Gould.
Intensity III was reported within about 300 km of the epicenter throughout
Texas and Oklahoma and II as far as 500 km away in Dallas (among other), Texas.
Hurricane Bertha, the first Gulf of Mexico/America storm of the season
made landfall on the coast of Louisiana and Texas at about 10:00 UT on
July 23, coincident with this earthquake in the Texas Panhandle. Stresses
from this landfall of Bertha probably were the main triggers for this coincident
in Texas. This summary has followed the progress of Bertha in previous issues
for example as:
"TS BERTHA 2026-07-21 00:00 UT 29.3N 87.9W 50 kts South of Florida
TS Bertha (02L) continued today south of Florida (US) in the northern Gulf of America (Mexico) with winds up to 50 kts. It is expected to track to the west over the next several days but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Bertha is near 29S 92E in the South Indian Ocean where enhanced seismicity is unlikely at this time. Landfall is expected in two days near New Orleans, Louisiana." (July 21, 2026)
This is the strongest earthquake within about 200 km of this epicenter in
the Texas Panhandle in more than 35 years and matches the strongest earthquake
every recorded in this area - an M 5.0 on July 30, 1925. An M 5.1 occurred about 300 km to the
east of this on February 13, 2016 in Oklahoma.
This forecast had expected today's event at a lower magnitude was likely around
July 24, 2026 in forecast 184150 as follows:
O: 23JUL2026 10:21:43 35.9N 101.0W ML=5.0 NEIC TEXAS PANHANDLE
P: 24JUL2026 184150 35.4N 101.8W 2.0-4.1 AAAAA SW U.S.A
The area has begun to show signs of unrest in recent years however. The last earthquake
in this area with M>=4 for example occurred as an M 4.3 on April 14, 2021.
At the time this summary noted:
"Two unusual earthquakes occurred today in the region of northern Texas.
This activity is at 100-104 degrees from the major and great earthquakes
in the Loyalty Islands, Kermadec Islands and North Island, New Zealand of
February and March , 2021 and was likely promoted by energy from that source.
The largest of these, and the strongest in the U.S. or Canada was an M 4.3 which hit the Texas Panhandle today. NEIC reported it was felt with intensity IV in Miami, Texas and II-III in Borger, Skellytown, Pampa, Perryton, Groom, Amarillo, and possibly as far as Axtell, Nebraska.
This is the strongest earthquake within about 200 km of this epicenter in at
least 30 years. The only earthquake in this area of larger magnitude in the
past 50 years was an M 4.5-4.6 on February 15, 1974. The strongest quake in this
area on record is an M 5.0 on July 30, 1925." (April 14, 2021)
This epicenter is at 22.4 degrees from the NEIC position of the epicenter
of the M 7.3 Chiapas earthquake (the 16th node is at22.5 degrees). Readers
are aware that a number of significant earthquakes in the past several days
have been occurring at the eighth node (45 degrees) from Chiapas, so the
distance of 22.5 degrees (node 16) or half of that is probably quite important
and this earthquake in Texas was likely promoted by energy from Chiapas.
This earthquake is also at the third node (120 degrees) from Mindanao, Philippines
and may have been promoted by energy from that source.
O: 23JUL2026 10:21:43 35.9N 101.0W ML=5.0 NEIC TEXAS PANHANDLE
The earthquake in Texas followed 51 minutes after an M 5.1 in the eastern Andreanof Islands,
Alaska. Several reflected P-phases were in the area of Texas from Alaska
at the time of the earthquake in Texas, but it is unlikely they triggered it.
This epicenter in Alaska is at the fourth node (90 degrees) from Venezuela and
at the fifth node (72 degrees) from Chiapas and may have been promoted by
energy from those sources.
O: 23JUL2026 09:30:18 51.6N 173.6W ML=5.1 NEIC ANDREANOF ISLANDS, ALASKA
O: 23JUL2026 06:51:06 51.6N 172.9W mb=4.6 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
An M 4.9 also occurred in the Kodiak Island area of Alaska today. NEIC reported it was felt with intensity II in Kodiak.
This epicenter is at the sixth node (60 degrees) from Chiapas and at 105 degrees
from New Zealand and may have been promoted by energy from those sources.
O: 22JUL2026 18:51:30 56.0N 153.2W ML=3.2 EMSC KODIAK ISLAND REGION, ALASKA
O: 22JUL2026 18:13:22 56.3N 153.5W Mw=4.8 EMSC KODIAK ISLAND REGION, ALASKA
A swarm of light earthquakes occurred in the Brawley area of Southern California
today. The largest of these at this writing was an M 3.6. NEIC reported
these were being felt with intensity up to III in Brawley and Imperial, California.
These events began within a couple of minutes of local solar midnight and may
have been promoted by tidal and/or geomagnetic stresses which maximize near
this hour.
These events are occurring at the 13th node (27.6 degrees) from Chiapas
and at 104 degrees from South Island, New Zealand and were probably
promoted by energy from those sources.
O: 23JUL2026 08:49:11 32.9N 115.5W ML=3.4 NEIC SOUTHERN CALIFORNIA
O: 23JUL2026 08:49:11 32.9N 115.5W ML=3.4 NEIC SOUTHERN CALIFORNIA
O: 23JUL2026 07:14:20 32.9N 115.5W ML=3.1 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 07:31:48 32.9N 115.5W ML=3.6 NEIC SOUTHERN CALIFORNIA
O: 23JUL2026 07:16:27 33.0N 115.5W ML=2.1 EMSC SOUTHERN CALIFORNIA
O: 23JUL2026 07:15:41 33.2N 116.1W ML=2.4 EMSC SOUTHERN CALIFORNIA
O: 22JUL2026 09:34:16 33.5N 116.5W ML=2.2 EMSC SOUTHERN CALIFORNIA
Far-field triggering of earthquakes from Chiapas, Mexico, South Island New Zealand and Venezuela continued unabated
today. Most of the largest earthquakes of the day occurred at nodal distances
from Chiapas and had been expected in this sequence. In the previous issue of this
summary this had been discussed in part as:
"The strongest earthquakes since last report were both of M 5.6 and occurred
in Vancouver Island, Canada and in the northern mid-Atlantic Ridge. A second
earthquake of M 5.2 about 1000 km north of the M 5.6 in the northern Atlantic
occurred later in the day. All of these earthquakes are at the eighth
node (45 degrees) from the Chiapas mainshock. A strong series of light shocks
also occurred in Antofagasta, Chile and in Bolivia today - these are also
at 45 degrees from Chiapas. Stress from the Chiapas mainshock may have
propagated east and west from the rupture leading to this pattern of
far-field seismicity with strong earthquakes to the east and west and
weaker events to the south and north. This activation at 45 degrees from
Chiapas (node 8) was repeated with a number of moderate earthquakes
at 90 degrees (also node 8 and node 4) in the areas of Kamchatka and
the Tonga/Fiji/Samoa/Kermadec region. Fourth nodal earthquakes also
were active around the Venezuela epicenters of M 7.5 in June 24. This
distance includes the Azores and Santiago, Chile where moderate quakes
were recorded today. The Azores are also at the sixth node from Chiapas
and could see enhanced seismicity in the next several days." (July 21, 2026)
This summary has been following the sequence of events at 45 degrees (node 8)
from Chiapas with interest over the past several days. In the previous
issue of this summary it was noted for instance:
"In particular the series referred to in the Antofagasta region of Chile
intensified today with two moderate earthquakes of M 4.2 and 4.1 at 45
degrees from the Chiapas mainshock. This sequence could intensify further
in the next several days and could include events in the region of M>=5.
Today's earthquakes in Antofagasta were reported by NEIC to have been felt with intensity III in Antofagasta.
EMSC reported moderate shaking in Chile at Arica, Tarapaca, Iquique." (July 22, 2026)
This sequence climaxed today with an M 5.1 in Antofagasta, Chile and a second
event of M 5.1 south of this in Atacama, Chile. EMSC reported these events
were felt with moderate intensity in Calama, Chile.
These epicenters are respectively at 44.8 degrees and 46.9 degrees south
of the NEIC Chiapas epicenter and qualify as eighth nodal earthquakes (at 45 degrees).
These illustrate how nodality can be used to help forecast seismic activity.
O: 22JUL2026 11:12:51 22.2S 68.5W Mw=4.3 EMSC ANTOFAGASTA, CHILE
O: 23JUL2026 01:56:01 23.1S 68.9W mb=4.7 EMSC ANTOFAGASTA, CHILE
O: 22JUL2026 17:34:36 23.4S 68.5W Mw=5.1 EMSC ANTOFAGASTA, CHILE
O: 22JUL2026 11:37:19 23.8S 68.3W mb=4.6 EMSC ANTOFAGASTA, CHILE
O: 22JUL2026 09:34:23 27.8S 71.6W mb=5.1 EMSC OFFSHORE ATACAMA, CHILE
NEIC reported an earthquake of M 5.1 in the Central Mid-Atlantic was not felt.
This epicenter is at the seventh node (52 degrees) from Chiapas, Mexico and
may have been promoted by energy from that source.
O: 23JUL2026 06:29:57 8.5N 39.4W Mw=5.1 EMSC CENTRAL MID-ATLANTIC RIDGE
O: 23JUL2026 06:30:12 10.0N 41.0W Mw=4.9 EMSC CENTRAL MID-ATLANTIC RIDGE
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake yesterday but the series declined
considerably in intensity over the day. The mainshock was extensively
discussed in this summary in previous issues and readers are referred
to those issues for further details as presented at that time.
Followoing is a listing of aftershocks in the the Chiapas, Mexico area of M>=4
recorded since the last issue of this summary.
O: 22JUL2026 22:12:01 13.8N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 21:46:51 13.9N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 10:00:33 14.0N 93.0W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 10:54:07 14.0N 92.8W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 22JUL2026 09:47:39 14.1N 92.9W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 22JUL2026 10:13:09 14.1N 93.6W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 11:39:34 14.1N 93.3W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 20:53:23 14.1N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 21:17:02 14.1N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 21:52:40 14.1N 93.4W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 23JUL2026 00:29:21 14.1N 92.1W ML=4.1 EMSC OFFSHORE GUATEMALA
O: 22JUL2026 08:19:49 14.2N 93.2W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 09:53:05 14.2N 92.8W mb=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 22JUL2026 17:03:30 14.2N 92.8W mb=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 23JUL2026 06:47:20 14.2N 93.8W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 13:23:00 14.3N 93.2W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 22JUL2026 18:13:05 14.3N 93.2W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 22JUL2026 22:39:35 14.3N 94.0W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 10:24:53 14.4N 92.9W mb=4.5 EMSC OFFSHORE CHIAPAS, MEXICO
O: 22JUL2026 08:32:17 14.6N 93.2W mb=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 23JUL2026 06:25:22 15.2N 93.3W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 22JUL2026 09:34:48 13.4N 92.7W ML=4.2 EMSC OFF THE COAST OF GUATEMALA
NEIC reported an earthquake of M 3.2 in southern Idaho was felt with intensity up to II-III in the area(s) of southern Idaho in Bern, Montpelier.
O: 23JUL2026 03:12:46 42.4N 111.4W ML=3.2 EMSC SOUTHERN IDAHO
NEIC reported earthquakes of M 5.0 and M 4.2 in northern Sumatra, Indonesia was felt with intensity up to II-III in the area(s) of northern Sumatra, Indonesia with IV in Medan, and Kuala Simpang, Aceh and II in Malaysia at Kuala Lumpur and Batu Gajah Perak.
EMSC reported moderate shaking in Mueang Phuket, Thailand and in Malaysia at Ladang Seri Kundang and Putrajaya.
These earthquakes occurred near local solar noon and may have been promoted
by tidal and/or geomagnetic stresses.
Moderate quakes today also continued in the Kermadec Islands with M 4.9, 4.9, 5.0 and M 4.8.
They were not reported felt.
This epicenter is at the fourth node (90 degrees) from Chiapas and
may have been promoted by energy from that source.
O: 22JUL2026 20:07:26 29.6S 177.0W mb=4.9 EMSC KERMADEC ISLANDS, NEW ZEALAND
O: 22JUL2026 21:03:01 29.6S 177.8W mb=5.0 EMSC KERMADEC ISLANDS, NEW ZEALAND
O: 22JUL2026 15:39:21 29.7S 177.2W mb=4.9 EMSC KERMADEC ISLANDS, NEW ZEALAND
O: 22JUL2026 15:45:47 29.7S 177.0W mb=4.8 EMSC KERMADEC ISLANDS REGION
NEIC also reported an earthquake of M 4.9 in Vanuatu was not felt.
This epicenter lies at 103 degrees from Chiapas, Mexico and may have
been promoted by energy from that source.
O: 22JUL2026 21:42:49 14.8S 168.0E mb=4.9 EMSC VANUATU
NEIC reported an earthquake of M 4.2 in the Gulf of California was not felt.
This epicenter is at 103 degrees from New Zealand; at the eighth node (46 degrees) from Venezuela and at the 16th node (24 degrees) may have been promoted
by energy from those sources.
O: 23JUL2026 02:01:05 30.3N 113.7W ML=4.2 EMSC GULF OF CALIFORNIA
NEIC reported an earthquake of M 2.7 in San Francisco, California was felt with intensity up to II-III in the area(s) of San Francisco, California with IV in Hayward and III in Oakland, San Leandro, Castro Valley.
O: 23JUL2026 00:52:11 37.7N 122.1W MD=2.7 EMSC SAN FRANCISCO BAY AREA, CALIF.
NEIC reported an earthquake of M 2.5 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in Redwood Valley.
O: 23JUL2026 00:30:37 39.4N 123.2W MD=2.5 EMSC NORTHERN CALIFORNIA
O: 22JUL2026 10:37:25 39.6N 123.4W MD=2.1 EMSC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 3.5 in Nevada was felt with intensity up to II-III in the area(s) of Nevada in Silver Springs, Dayton, Yerington, Carson City and Gardnerville.
O: 22JUL2026 17:20:52 39.1N 119.0W Mw=3.5 EMSC NEVADA
EMSC reported an earthquake of M 3.7 in Portugal was felt with intensity up to IV in the area(s) of Portugal in Evora, Arraiolos, Alvito, Cuba, Reguengos de Monsaraz, Alcacer do Sal, Beja, Fronteira, Moura, Avis, Serpa, Setubal, Olivais, Prageal, Ramada, Charneca de Caparica, Fundao and Massama and up to 190 km from the epicenter.
This earthquake is near the antipode of the M 6.3 in New Zealand and at the
sixth node (60 degrees) from Venezuela and may have been promoted by energy from those sources.
O: 22JUL2026 00:22:04 38.5N 7.9W ML=3.7 EMSC PORTUGAL
EMSC reported an earthquake of M 4.2 in Valparaiso, Chile was felt with intensity up to IV in the area(s) of Valparaiso, Chile in Santiago and Valparaiso.
O: 23JUL2026 07:48:51 32.6S 71.8W ML=4.2 EMSC OFFSHORE VALPARAISO, CHILE
EMSC reported an earthquake of M 4.8 in Southern Peru was felt with intensity up to IV in the area(s) of Southern Peru at Ciudad Satelite.
O: 23JUL2026 02:38:25 16.2S 72.7W mb=4.8 EMSC NEAR COAST OF SOUTHERN PERU
EMSC reported an earthquake of M 4.9 in Mindanao, Philippines was felt with intensity up to IV in the area(s) of Mindanao, Philippines in Glan, General Santos.
O: 22JUL2026 09:47:19 5.7N 125.4E mb=4.9 EMSC MINDANAO, PHILIPPINES
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
HURRICANE FAUSTO (06E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR FAUSTO 2026-07-23 00:00 UT 17.7N 123.5W 85 kts Pacific Southwest of Mexico
Hurricane Fausto (06E) continued today southwest of Baja California, Mexico in the north Pacific Ocean with winds up to 85 kts. It is expected to track to the west over the next several days reaching hurricane force winds by July 23 with gusts up to 95 kts but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of Hurricane Fausto is near 18S 57E in the South Indian Ocean where some enhanced seismicity is unlikely but possible as this storm moves to the west and intensifies.
HURRICANE BERTHA (02L)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR BERTHA 2026-07-23 00:00 UT 30.3N 93.9W 50 kts Texas/Louisiana
TS Bertha (02L) continued today in the northern Gulf of America (Mexico) and is expected to make landfall near the Louisiana/Texas border early on July 23 with winds up to 50 kts. It is expected to track to the west and make a second landfall on the Texas coast later on July 23. Seismicity in Texas and Louisiana could be enhanced by this landfall event. The antipode of today's location of Hurricane Bertha is near 30S 86E in the South Indian Ocean where enhanced seismicity is unlikely at this time. Landfall is expected in two days near New Orleans, Louisiana.
A tropical cyclone may be forming east of the northern Philippines. This system is currently located at 17N 128E with winds up to 35 kts. It is expected to track to the west passing south of Taiwan as a light typhoon around July 24-25. Some seismic enhancement in the northern Philippines and Taiwan is possible as this storm moves through the area. The antipode at 17S 52W is not a seismic area but as this system moves west the antipode will shift to an area of northern Chile and southern Peru and could trigger a moderate regional earthquakes at that time in that area.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 21, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0305 0315 0345 C5.0 (July 23, 2026) 1.0E-03 *
Southern Idaho M 3.2 03:13 UT
Papua M 4.0 03:04 UT
Mexico M 3.9 03:09 UT
9180 0620 0630 0700 M3.6 (July 22, 2026) 9.5E-03 *
Papua M 4.9 06:46 UT
Myanmar M 3.6 06:19 UT
9040 0002 0011 0015 C2.4 (July 22, 2026) 1.5E-03
Portugal M 3.7 00:22 UT
9090 0102 0106 0108 C2.6 (July 22, 2026) 8.8E-04
Nevada M 2.4 01:03 UT
9210 0314 0323 0332 C1.4 (July 22, 2026) 1.6E-03
Chiapas M 4.2 03:14 UT
9120 0332 0338 0345 C6.8 (July 22, 2026) 3.6E-03
Kuril M 4.6 03:45 UT
Chiapas M 4.4 03:48 UT
9290 1209 1218 1222 C3.0 (July 22, 2026) 1.5E-03
9330 1546 1553 1556 C3.4 (July 22, 2026) 1.2E-03
Kermadec Is. M 4.9 15:46 UT
9350 1842 1851 1854 C5.4 (July 22, 2026) 1.8E-03
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active July 23 minor storms July 24 disturbed July 25. Solar M-flare chance: 55% X-class: 10% proton storm: 5%
AP Indicies: global: 12, high: 26, mid-latitude: 11, time of max k: 10:00-13:00 UT; Max k: 6 Global Kp 3.33 0900-1200, July 22; Sunspot Number: 63; Radio Flux: 150
The highest Hp30 index today was 3.66 mid-UT day on July 22 and again from
08:00 - 09:00 on July 23, 2026. No geomagnetic storms were observed today.
July 22, 2026
Notable earthquakes and events:
Far-field triggering of earthquakes from Chiapas, Mexico, South Island New Zealand and Venezuela continued unabated
today. Most of the largest earthquakes of the day occurred at nodal distances
from Chiapas and had been expected in this sequence. In the previous issue of this
summary this had been discussed in part as:
"The strongest earthquakes since last report were both of M 5.6 and occurred
in Vancouver Island, Canada and in the northern mid-Atlantic Ridge. A second
earthquake of M 5.2 about 1000 km north of the M 5.6 in the northern Atlantic
occurred later in the day. All of these earthquakes are at the eighth
node (45 degrees) from the Chiapas mainshock. A strong series of light shocks
also occurred in Antofagasta, Chile and in Bolivia today - these are also
at 45 degrees from Chiapas. Stress from the Chiapas mainshock may have
propagated east and west from the rupture leading to this pattern of
far-field seismicity with strong earthquakes to the east and west and
weaker events to the south and north. This activation at 45 degrees from
Chiapas (node 8) was repeated with a number of moderate earthquakes
at 90 degrees (also node 8 and node 4) in the areas of Kamchatka and
the Tonga/Fiji/Samoa/Kermadec region. Fourth nodal earthquakes also
were active around the Venezuela epicenters of M 7.5 in June 24. This
distance includes the Azores and Santiago, Chile where moderate quakes
were recorded today. The Azores are also at the sixth node from Chiapas
and could see enhanced seismicity in the next several days." (July 21, 2026)
In particular the series referred to in the Antofagasta region of Chile
intensified today with two moderate earthquakes of M 4.2 and 4.1 at 45
degrees from the Chiapas mainshock. This sequence could intensify further
in the next several days and could include events in the region of M>=5.
Today's earthquakes in Antofagasta were reported by NEIC to have been felt with intensity III in Antofagasta.
EMSC reported moderate shaking in Chile at Arica, Tarapaca, Iquique.
O: 21JUL2026 17:09:53 21.3S 69.1W MB=4.2 EMSC ANTOFAGASTA, CHILE
O: 22JUL2026 01:48:45 23.5S 70.6W MW=4.1 EMSC OFFSHORE ANTOFAGASTA, CHILE
Eighth nodal earthquakes were not the only evidence of continuing far-field
triggering today. A pair of earthquakes off the coast of Oregon of M 4.6 and M 4.6
NEIC reported they were felt with intensity II in Coos Bay, Oregon and possibly in Crescent City, California.
These earthquakes are occurring at 104-105 degrees from the M 6.3 in
New Zealand; at the sixth node (60 degrees) from Venezuela and at the
ninth node (40 degrees) from Chiapas, Mexico. The distance from New Zealand
is similar to the distance from that source in the past several days
to Vancouver, B.C. (M 5.6); Peru (M 5.6) and Chiapas, Mexico (M 7.3)
among others and is a distance discussed in previous issues of this summary
where enhanced seismcity is considered likely following major earthquakes.
The earthquakes off the coast of Oregon are the strongest within about
200 km of that volcanic zone since an M 5.5 on June 29, 2026. At the time
this summary noted:
"A moderately strong earthquake of M 5.5 occurred off the coast of Oregon today.
NEIC reported it was felt with intensity III in Sutherlin, Oregon and II in Oregon
at Seaside, Eugene, Portland, Rockaway Beach, Williams and possibly in San Francisco, California and Friday Harbor, Washington.
The last earthquake of M>=5.5 within about 200 km of today's epicenter was an
M 6.0 on January 16, 2026. At the time this summary noted:
"A strong earthquake of M 6.0 occurred today in the region off the coast of
Oregon. NEIC reported it was felt along the coast of Oregon with intensity IV in
Port Orford; III in Neskowin, Portland, Sherwood, Otis, Siletz, Seal Rock, Lake Oswego and Reedsport.
No tsunami was expected nor observed with this earthquake. The last earthquakes
off the coast of Oregon with M>=6 occurred as an M 6.0 on October 30, 2024 and an M 6.3 on October 29, 2019.
...
The last earthquakes within about 200 km of today's epicenter with M>=6 occurred
with M 6.3 on August 29, 2019 and M 6.2 on August 22, 2018. Only one other such
event has hit the area in the past 15 years - an M 6.0 on April 11, 2012.
At the time of the 2019 event this summary noted:
"This is the strongest earthquake off the coast of Oregon within about 250
km of this epicenter in more than 10 years - since an M 6.3 on January 10, 2008
and prior to that an M 6.3 on January 16, 2003. The only event in the region
with greater magnitude in the past 30 years was an M 6.9 on July 13, 1991." (August 29, 2019)
More recently on September 2, 2024 this summary reviewed recent seismicity in the area as:
"The strongest earthquake in the U.S. or Canada today was an M 4.2 off the coast of Oregon.
NEIC reported this earthquake of M 4.2 off the coast of Oregon was felt with intensity up to II in the area(s) of Oregon in Portland.
This area has been relatively quiet in recent months. The last earthquake
of M>=4.2 occurred on May 4, 2024 with M 4.3. The last of significantly larger
magnitude was an M 5.7 on March 27, 2024...." (January 16, 2026)
Today's event may be related to volcanism in the area off Oregon. The timing
however suggests tidal triggering from the full moon of June 29, 2026 combined
with energy related to the earthquakes in Venezuela of June 24. This epicenter
lies at the sixth node (60 degrees) from the quakes in Venezuela, similar
to an M 5.8 in Iceland yesterday. Far-field triggering at the third and sixth
nodes from Venezuela has been prominent in recent days as discussed
in previous issues of this summary." (June 29, 2026)
O: 22JUL2026 05:09:52 43.2N 127.7W MB=4.6 EMSC OFF COAST OF OREGON
O: 21JUL2026 18:32:56 43.4N 127.1W Mw=4.6 EMSC OFF COAST OF OREGON
O: 21JUL2026 18:44:52 43.5N 127.0W ML=3.0 EMSC OFF COAST OF OREGON
An earthquake of M 5.3 occurred in the Azores Islands, Portugal today.
The last earthquake recorded in the Azores within about 200 km of today's
epicenter with M>=5.3 was an M 5.3 on January 2, 2023 but the last of significantly
larger magnitude was an M 5.6 on August 20, 2017. At the time of the January, 2023
event this summary noted:
"The series of events of M 5.3, 4.7 and 4.7 which shook the Azores yesterday in the north
Atlantic continued today. The M 5.3 in the Azores is the strongest event within about 250
km of that epicenter since an M 5.3 on February 16, 2019. The last earthquake of significantly
larger magnitude in this area of the Azores was an M 5.6 on December 23, 2003.
Today's M 5.3 occurred at the end of a C7 class solar flare and may have been promoted
by energy associated with SFE from that flare. Forecasts 149416 and 149696
had expected enhanced seismicity within about 50 km of these epicenters
between December 29, 2022 and January 2, 2003. ..." (January 2, 2023)
"The Azores are also at the sixth node from Chiapas
and could see enhanced seismicity in the next several days." (July 21, 2026)
Today's event in the Azores occurred at 60.1 (node 6) degrees from Chiapas and at 45.0
degrees from Venezuela (node 8) and further illustrates recent nodal triggering
at the eighth node.
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake yesterday but the series declined
considerably in intensity over the day. The mainshock was extensively
discussed in this summary in previous issues and readers are referred
to those issues for further details as presented at that time.
Following is a listing of aftershocks of M>=4 in Chiapas since last report.
The strongest of M 4.6 occurred near local solar midnight while two events
of M 4.2 occurred within minutes of local solar noon suggesting sub-solar
conditions at this epicenter (see discussion in previous issues of this
summary) continued to enhance aftershocks magnitudes at this time.
O: 21JUL2026 22:39:49 13.4N 93.0W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 01:31:39 15.3N 94.7W ML=4.0 EMSC OFF COAST OF OAXACA, MEXICO
O: 21JUL2026 09:21:23 13.8N 92.9W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 21JUL2026 09:01:48 13.9N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 21JUL2026 16:13:15 13.9N 93.0W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 04:31:25 13.9N 93.0W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 21JUL2026 09:43:26 14.0N 92.8W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 21JUL2026 18:36:22 14.0N 93.1W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 21JUL2026 22:08:42 14.0N 93.5W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 05:25:03 14.0N 93.0W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 21JUL2026 12:42:32 14.1N 93.2W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 21JUL2026 14:59:02 14.1N 93.3W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 21JUL2026 21:39:29 14.1N 93.6W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 21JUL2026 06:43:12 14.2N 93.0W mb=4.6 EMSC OFFSHORE CHIAPAS, MEXICO
O: 21JUL2026 09:10:00 14.2N 92.6W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 21JUL2026 15:21:21 14.4N 93.3W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 22JUL2026 03:48:30 14.4N 92.9W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 21JUL2026 18:27:02 14.5N 92.8W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 21JUL2026 10:50:58 14.8N 94.2W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 22JUL2026 03:14:51 14.9N 93.1W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 21JUL2026 12:31:17 15.0N 93.0W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
NEIC reported an earthquake of M 3.0 in southern Idaho was felt with intensity up to II-III in the area(s) of southern Idaho in Bern, Montpelier and in Tahyne, Wyoming.
O: 22JUL2026 06:09:13 42.4N 111.4W ML=2.9 EMSC SOUTHERN IDAHO
O: 22JUL2026 06:09:13 42.4N 111.4W ML=3.0 NEIC SOUTHERN IDAHO
NEIC reported earthquakes of M 5.0 and M 4.2 in northern Sumatra, Indonesia was felt with intensity up to II-III in the area(s) of northern Sumatra, Indonesia with IV in Medan, and Kuala Simpang, Aceh and II in Malaysia at Kuala Lumpur and Batu Gajah Perak.
EMSC reported moderate shaking in Mueang Phuket, Thailand and in Malaysia at Ladang Seri Kundang and Putrajaya.
These earthquakes occurred near local solar noon and may have been promoted
by tidal and/or geomagnetic stresses.
O: 22JUL2026 04:18:22 4.2N 97.5E MW=5.0 EMSC NORTHERN SUMATRA, INDONESIA
O: 22JUL2026 04:26:53 4.3N 97.6E ML=4.2 EMSC NORTHERN SUMATRA, INDONESIA
NEIC reported an earthquake of M 4.7 in northern Chile was felt with intensity up to II-III in the area(s) of northern Chile in Tarapaca at Arica and Iquique and with IV in Tacna, Peru.
O: 22JUL2026 02:03:49 19.3S 70.1W MW=4.7 EMSC TARAPACA, CHILE
NEIC reported an earthquake of M 5.1 in Mindanao, Philippines was felt with intensity up to II-III in the area(s) of Mindanao, Philippines in San Jose and Buayan.
O: 21JUL2026 18:33:28 5.7N 125.4E MB=5.1 EMSC MINDANAO, PHILIPPINES
The strongest earthquake in the world today was an earthquake of M 5.6 in the Kermadec Islands where it was not reported felt.
This epicenter is at the fourth node (90 degrees) from Chiapas and
may have been promoted by energy from that source.
O: 21JUL2026 12:14:33 29.5S 176.9W MW=5.6 EMSC KERMADEC ISLANDS REGION
NEIC also reported earthquakes of M 4.4 and M 4.8 in Vanuatu were not felt.
These epicenters lie at 103 degrees from Chiapas, Mexico and may have
been promoted by energy from that source.
O: 21JUL2026 15:29:12 18.9S 169.3E MB=4.4 EMSC VANUATU
O: 21JUL2026 22:33:01 17.9S 168.6E mb=4.8 EMSC VANUATU
NEIC reported an earthquake of M 4.0 in Yunnan, China may have been felt with intensity up to II-III in the area(s) of Simao, Yunnan, China.
This epicenter is at the fourth node (90 degrees) from New Zealand and
at 145 degrees from Venezuela and may have been promoted by energy from those
sources.
O: 21JUL2026 11:43:09 23.2N 101.5E MB=4.9 EMSC YUNNAN, CHINA
NEIC reported an earthquake of M 5.0 in Guam was felt with intensity up to II-III in the area(s) of Guam in Piti and Tamuning.
O: 21JUL2026 11:09:46 12.9N 144.3E MB=5.0 EMSC GUAM REGION
NEIC reported an earthquake of M 3.4 in the Gulf of California was not felt.
This epicenter is at 103 degrees from New Zealand and may have been promoted
by energy from that source.
O: 21JUL2026 22:43:44 30.7N 114.3W ML=3.4 EMSC GULF OF CALIFORNIA
EMSC reported an earthquake of M 3.7 in Portugal was felt with intensity up to IV in the area(s) of Portugal in Evora, Arraiolos, Alvito, Cuba, Reguengos de Monsaraz, Alcacer do Sal, Beja, Fronteira, Moura, Avis, Serpa, Setubal, Olivais, Prageal, Ramada, Charneca de Caparica, Fundao and Massama and up to 190 km from the epicenter.
This earthquake is near the antipode of the M 6.3 in New Zealand and at the
sixth node (60 degrees) from Venezuela and may have been promoted by energy from those sources.
O: 22JUL2026 00:22:04 38.5N 7.9W ML=3.7 EMSC PORTUGAL
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
HURRICANE FAUSTO (06E)
---- ------- ---------- -------- ----- ------ ------- ---------------
HURR FAUSTO 2026-07-22 00:00 UT 16.5N 120.0W 85 kts Pacific Southwest of Mexico
TS Fausto (06E) continued today southwest of Baja California, Mexico in the north Pacific Ocean with winds up to 85 kts. It is expected to track to the west over the next several days reaching hurricane force winds by July 23 with gusts up to 115 kts but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Fausto is near 16S 60E in the South Indian Ocean where some enhanced seismicity is unlikely but possible as this storm moves to the west and intensifies.
TROPICAL STORM BERTHA (02L)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS BERTHA 2026-07-22 00:00 UT 29.3N 87.9W 50 kts South of Florida
TS Bertha (02L) continued today south of Florida (US) in the northern Gulf of America (Mexico) with winds up to 50 kts. It is expected to track to the west over the next several days but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Bertha is near 29S 92E in the South Indian Ocean where enhanced seismicity is unlikely at this time. Landfall is expected in two days near New Orleans, Louisiana.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 21, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0620 0630 0700 M3.7 (July 22, 2026) 3.7E-03
Papua M 4.9 06:46 UT
Myanmar M 3.606:19 UT
8670 0015 0020 0025 C2.4 (July 21, 2026) 1.4E-03
Fiji M 4.6 00:25 UT
8690 0038 0051 0101 C6.5 (July 21, 2026) 6.1E-03
Nevada M 2.7 0:40 UT
Chiapas M 4.2 00:48 UT
Northern Mid-Atlantic M 5.2 01:03 UT
8700 0120 0129 0148 C2.6 (July 21, 2026) 5.0E-03
Nevada M 2.8 01:23 UT
8720 0148 0158 0200 C2.5 (July 21, 2026) 2.2E-03
nshu M 4.0 14:55 UT
8730 0347 0405 0413 C4.3 (July 21, 2026) 4.6E-03
Nevada M 2.1 03:48 UT
Leyte M 4.0 03:56 UT
8780 0935 0956 1005 C7.7 (July 21, 2026) 9.2E-03
Chiapas M 4.2 09:43 UT
8800 1136 1142 1152 C4.0 (July 21, 2026) 3.3E-03
Yunnan M 4.9 11:43 UT
Flores Sea M 4.5 11:47 UT
8850 1403 1414 1416 C5.1 (July 21, 2026) 2.8E-03
8890 1431 1438 1443 C3.1 (July 21, 2026) 3.0E-03
8950 1443 1457 1509 C3.4 (July 21, 2026) 5.4E-03
Argentina M 4.3 14:55 UT
Honshu M 4.0 14:55 UT
Chiapas M 4.1 14:59 UT
8910 1605 1608 1610 C5.1 (July 21, 2026) 1.7E-03
Chiapas M 4.1 16:13 UT
8920 1702 1707 1714 C3.3 (July 21, 2026) 2.4E-03
Antofagasta M 4.2 17:09 UT
Drake Passage M 4.8 17:21 UT
8930 1716 1727 1730 M1.9 (July 21, 2026) 8.8E-03
Drake Passage M 4.8 17:21 UT
8960 1916 1924 1926 C2.9 (July 21, 2026) 1.8E-03
Loyalty Is. M 4.8 19:29 UT
New South Wales M 2.8 19:31 UT
8970 2027 2033 2039 C3.1 (July 21, 2026) 2.2E-03
Mindanao M 3.3 20:33 UT
8990 2203 2212 2220 C1.5 (July 21, 2026) 1.6E-03
Chiapas M 4.0 22:08 UT
Myanmar M 4.0 22:16 UT
9020 2231 2240 2245 C2.0 (July 21, 2026) 1.5E-03
Vanuatu M 4.8 22:33 UT
Chiapas M 4.4 22:40 UT
Gulf of California M 3.4 22:43 UT
9030 2251 2255 2259 C2.4 (July 21, 2026) 1.1E-03
Nepal M 4.0 22:55 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: minor storms July 22 active July 23-24. Solar M-flare chance: 55% X-class: 10% proton storm: 5%
AP Indicies: global: 14, high: 23, mid-latitude: 14, time of max k: 10:00-13:00 UT; Max k: 5 Global Kp 3.67 0900-1200, July 21; Sunspot Number: 88; Radio Flux: 149
A moderate geomagnetic storm commenced early on UT July 21 and continued sporatically
through the remainder of July 21, 2026 (UT). This
reached Kp levels of 5 mid-day on UT Juky 21. It could help promote seismicity in areas
which are sub-solar at the time of commencement - which was about 12:00 UT. GOES-18 magnetometer recorded
a strong excursion in the intensity of the geomagnetic file at that satellite
starting about 18:45 30 on July 21. An arcjet maneuver was performed and
normal operations resumed by 20:17 UT. An M 4.6 occurred off the coast of
Oregon at the start of the geomagnetic excursion near the longitude of
the geo-stationary GOES 18 satellite (at 137W longitude) and may have been
triggered by it.
July 21, 2026
Notable earthquakes and events:
The strongest earthquakes since last report were both of M 5.6 and occurred
in Vancouver Island, Canada and in the northern mid-Atlantic Ridge. A second
earthquake of M 5.2 about 1000 km north of the M 5.6 in the northern Atlantic
occurred later in the day. All of these earthquakes are at the eighth
node (45 degrees) from the Chiapas mainshock. A strong series of light shocks
also occurred in Antofagasta, Chile and in Bolivia today - these are also
at 45 degrees from Chiapas. Stress from the Chiapas mainshock may have
propagated east and west from the rupture leading to this pattern of
far-field seismicity with strong earthquakes to the east and west and
weaker events to the south and north. This activation at 45 degrees from
Chiapas (node 8) was repeated with a number of moderate earthquakes
at 90 degrees (also node 8 and node 4) in the areas of Kamchatka and
the Tonga/Fiji/Samoa/Kermadec region. Fourth nodal earthquakes also
were active around the Venezuela epicenters of M 7.5 in June 24. This
distance includes the Azores and Santiago, Chile where moderate quakes
were recorded today. The Azores are also at the sixth node from Chiapas
and could see enhanced seismicity in the next several days.
One of the strongest earthquake of the day was an M 5.6 in the Vancouver Island area of Canada.
NEIC reported this earthquake was felt with intensity IV in British Columbia, Canada at Port MacNeill and lesser intensity in Victoria and Port Hardy.
The last earthquake within about 200 km of this epicenter near Vancouver
Island with M>=5.6 occurred as an M 6.4 on July 11, 2024.
This epicenter is at 109 degrees from the M 6.3 in New Zealand two days ago
and joins a number of other expected events at this distance range from
New Zealand including the M 7.3 in Chiapas, Mexico and the M 5.5 in Central
Peru (see previous issues of this summary for details). When the earthquake
in New Zealand occurred this summary noted this possibility as:
"Today's earthquake map on this website shows nodal areas where likely seismic enhancement may
occur following the event in New Zealand. The distance at 103 degrees
is notable as it passes through active areas of California, Mexico and Peru
among others. It is likely that enhanced seismicity in those areas will
continue following today's event in New Zealand." (July 17, 2026)
It appears that today's earthquake in Vancouver may be third in this triad
of events (noted as possibly in California) in the forecast above.
At the time of the M 6.4 of July 11, 2024 this summary noted:
"The strongest earthquake in the world today was an M 6.4 in the series in Vancouver
Island, British Columbia which began July 4, 2024. NEIC reported it was lightly
felt with moderate intensity up to IV in Tofino, Canada. EMSC reported light
shaking in Chilliwack, Canada. Several moderate aftershocks - including
an M 5.4 - were also felt in this region. This summary has extensively
covered this swarm in previous issues as in the last summary which noted:
"This epicenter (in Mindanao, Philippines) is near 100 degrees from the M 6.7 yesterday south of Africa and at the
same distance from the continuing swarm of earthquakes in the Vancouver Island
area of British Columbia, Canada. With an earthquake at this depth these
areas are at the shadow zone boundary for S- and P-waves (normally 102-103 degrees
distance for earthquakes that occur near the surface. Thus the event today
in Mindanao is considered a triggered earthquake from the M 6.7 South of Africa
yesterday. Further activity (perhaps) a strong earthquake in Vancouver is
also likely at this time due to the concentration of energy from the area
south of Africa. A further complication perhaps leading to additional
enhancement in Vancouver, B.C. is the track of Hurricane Beryl. The remnants
Hurricane Beryl is now located over the northeastern U.S. where it has dropped
large reserves of water over the past two days. This summary has long been
a proponent of the theory that effects of strong meteorological events
(nor'easters and hurricanes, for example) affecting the Northeast U.S.
can trigger strong earthquakes on the Pacific-North American plate boundary
in particular from California north to Alaska. ..." (July 11, 2024)
In addition to being at 109 degrees from New Zealand, and at the sixth node (60 degrees) from Honshu, Japan this epicenter in Vancouver
is at the eighth node (45 degrees) from Chiapas, Mexico and had been
identified in the far-field forecast from Chiapas in this summary as possible at:
"Node 8 (45 degrees)
Eastern Mexico to Vancouver," (July 17-18, 2026)
O: 20JUL2026 06:41:31 49.5N 129.2W MW=5.6 EMSC VANCOUVER ISLAND, CANADA REGIO
An M 5.6 also occurred today in the northern Mid-Atlantic Ridge. It was not
reported felt in this remote oceanic epicentral area. It was followed about five
hours later by an M 5.2 about 1000 km to the north in the northern mid-Atlantic Ridge
system. Both of these earthquakes, like the event in Vancouver (see above) are
located at 45-46 degrees (node 8) from Chiapas.
The southern of these events occurred at the same latitude (14.5 north latitude)
as the mainshock in Chiapas and near local solar noon. As with the Chiapas
mainshock this can be considered a sub-solar earthquake and may have
been promoted by sub-solar tidal enhancement. The last earthquake within about
200 km of today's event in the North Atlantic with M>=5.6 was an M 5.7 on October 20, 2016.
At the time this summary noted:
"The strongest earthquake in the world today was an M 5.6-5.7 in the northern
Mid-Atlantic Ridge. It was not reported felt in this remote area. The epicener
is directly east of a similar M 5.6 in the Dominica which occurred yesterday
and was reported in the previous issue of this summary. Similar stresses which
helped promote the Dominica quake, along with motions associated with the
Dominica event, probably helped promote today's earthquake. These include
tidal stresses, geomagnetic stresses and stresses from recent hurricanes in
the area. The last earthquake of M>=5.7 within about 200 km of this epicenter occurred
as an M 6.0 on October 1, 1998. Most earthquakes within about 300 km of thie
epicenter with M>5.5 occur during hurricane season. Of 10 such events in the
past 25 years, nine have occurred between September and early December with
only one outside hurricane season - an M 5.6 on February 18, 2000." (October 20, 2015)
and
"The largest earthquake of the day was an M 6.0 on the northern mid-Atlantic
Ridge. This is a remote area and this earthquake was not reported felt in
the region. This is the area where several tropical storms have begun this
year but have dissipated before moving along the normal track to North America.
Earthquake of this magnitude are rare in this area. Only one other event of
M>=6 has hit within 300 km of this epicenter in the past 25 years - an M 6.0
about 100 km south of this epicenter on October 1, 1998." (September 5, 2013)
O: 20JUL2026 21:28:30 14.5N 45.0W MW=5.6 EMSC NORTHERN MID-ATLANTIC RIDGE
O: 21JUL2026 01:03:35 25.9N 45.1W MW=5.2 EMSC NORTHERN MID-ATLANTIC RIDGE
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake yesterday but the series declined
considerably in intensity over the day. The mainshock was extensively
discussed in this summary in previous issues and readers are referred
to those issues for further details as presented at that time.
One of the stronger aftershocks today in Chiapas was an M 4.6 near local solar
midnight on July 21. This appears to continue previous exceptional aftershocks
at local noon and midnight and may have been promoted by tidal and/or
geomagnetic stresses.
These epicenters in Chiapas, Mexico are located at 105-106 degrees from
the M 6.3 in New Zealand and the M 7+ in northern Honshu and were probably
promoted by energy from those sources (see above).
Following is a listing of aftershocks in the past 24 hours in the area of eastern Mexico and Guatemala
with M>=4.0. This is an active aftershock sequence and is expected to continue
to decline but remain active for several more days.
O: 20JUL2026 21:56:53 13.6N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 12:34:56 13.7N 93.0W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 14:13:18 13.8N 93.0W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 21JUL2026 09:21:23 13.8N 92.9W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 13:36:37 13.9N 92.9W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 21JUL2026 09:01:48 13.9N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 10:24:56 14.0N 93.1W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 10:28:25 14.0N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 21:20:50 14.0N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 23:17:25 14.0N 92.9W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 21JUL2026 02:40:59 14.0N 93.0W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 21JUL2026 09:43:27 14.0N 92.7W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 20JUL2026 08:14:45 14.1N 93.4W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 09:36:59 14.1N 93.4W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 10:07:21 14.1N 93.5W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 20:41:53 14.1N 93.5W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 06:40:48 14.2N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 07:41:28 14.2N 93.2W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 11:10:48 14.2N 92.8W mb=4.5 EMSC OFFSHORE CHIAPAS, MEXICO
O: 20JUL2026 15:14:55 14.2N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 20:12:54 14.2N 93.4W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 20:53:28 14.2N 93.2W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 22:37:34 14.2N 93.4W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 22:58:22 14.2N 93.3W ML=3.9 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 23:02:18 14.2N 93.2W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 21JUL2026 00:48:23 14.2N 93.1W mb=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 21JUL2026 06:43:12 14.2N 93.0W mb=4.6 EMSC OFFSHORE CHIAPAS, MEXICO
O: 21JUL2026 09:10:00 14.2N 92.6W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 20JUL2026 09:21:30 14.3N 93.1W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 20JUL2026 07:19:44 14.4N 92.9W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 20JUL2026 10:53:53 14.4N 92.5W mb=4.9 EMSC OFFSHORE CHIAPAS, MEXICO
O: 21JUL2026 05:06:51 14.4N 93.0W mb=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 20JUL2026 14:49:28 14.5N 93.0W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
The series of moderate earthquakes in northern and western Iran continued
today. Today's events included an M 5.2 and an M 4.9 in the Javanrud area of western Iran.
NEIC reported they were felt with moderate intensity III in Bakhtaran, Kermanshah and Ecbatana, Hamadan, Iran.
EMSC reported moderate shaking in Iran at Tazehabad, Kermanshah, Kahriz, Sonqor, As Sulaymaniyah, Hamadan, Bukan, Marivan, Kabudarahang and in Derbendixan and Khanaqin, Iraq.
The M 5.2 is the strongest in western Iran within about 200 km of today's
epicenter since an M 5.3 on June 6, 2021. The last event of significantly larger magnitude
in this area was an M 6.0 (and aftershocks) on August 25, 2018 and an M 5.9
on July 22, 2018 eight years ago. At the time this summary noted:
Strongest seismicity today also continued in Iran. Events occurred
at three separate epicenters with moderate to large events and included an M 5.9, an M 5.5 and M 5.4. An event of M 5.5 in southern Iran was reported felt with intensity V in Kerman, and II-III in Bahramabad and Giroft, Kerman, Iran and possibly in Irbil, Iraq.
Strong earthquakes in this area can help promote higher magnitudes of quake
in the San Andreas/Central California area because wavefronts from Iran are
parallel to this fault zone when they arrive in the area of California.
Much of this activity is at the third node (120 degrees) from Hawaii and may
have been promoted by energy from that area.
The earthquake in western Iran of M 5.9 was reported with intensity VIII in Kermanshah and VI in Halubah and Javanrud and Aslamabad. Intensity V shook Kordestan with lesser shaking in Ilam, Diyala, Iran. It was also felt in Iraq with intensity II-IV at Kirkuk, Balad and other communities within about 300 km of the epicenter.
Some damage was incurred in the epicentral zone in western Iran in the Kermanshah area.
This is the largest earthquake in western Iran within about 200 km of this epicenter
since an M 7.3 on November 12, 2107 and is probably the strongest aftershock to date of that event. The only
other activity in the region since 1990 with M>=5.9 occurred on August 8, 2014 with M 6.0 and 6.2 about 250 km to the southwest of today's epicenter." (July 22, 2018)
Today's series began yesterday and was reported in the previous issue of this
summary as:
"A series of moderate earthquakes were recorded in northern and western Iran
today. EMSC reported they woke people in Iran at Ahvaz and Dezful. These are in areas where bombing in the current hostilities in that
area is currently active. An M 4.8 and M 4.9 in western Iran and M 4.2 near
Tehran in northern Iran are in seismic areas and could have been promoted
by instabilities related to shaking from the current war in the area. More
such activity is therefore likely until the current waves of bombing cease.
The most likely continuing seismicity will be in western Iraq as these
epicenters are at 120.0 degrees from Chiapas (node 3) and at 105 degrees
from Venezuela and may have been promoted by energy from those sources.
The earthquake in northern Iran is also at 120 degrees from Chiapas, Mexico.
O: 19JUL2026 02:25:22 32.3N 47.4E MB=4.8 EMSC IRAN-IRAQ BORDER REGION
O: 19JUL2026 02:25:20 32.5N 48.6E MW=4.9 EMSC WESTERN IRAN
O: 19JUL2026 05:38:13 37.2N 54.0E MB=4.2 EMSC NEAR THE COAST OF NORTHERN" (July 19, 2026)
Today's epicenters are located at 103 degrees from Venezuela and near the third node from
Chiapas, Mexico and may have been promoted by energy from those sources.
O: 20JUL2026 03:48:50 34.5N 46.4E MW=5.2 EMSC WESTERN IRAN
O: 20JUL2026 03:43:18 34.6N 46.4E Mw=4.9 EMSC WESTERN IRAN
NEIC reported an earthquake of M 3.1 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaska near Sterling.
O: 21JUL2026 04:14:43 60.7N 150.3W ML=3.1 EMSC KENAI PENINSULA, ALASKA
NEIC reported an earthquake of M 3.0 in Hawaii was felt with intensity up to II-III in the area(s) of Hawaii in Pahala.
O: 21JUL2026 03:06:03 19.2N 155.5W ML=3.0 EMSC ISLAND OF HAWAII, HAWAII
NEIC reported an earthquake of M 3.1 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaska in Anchorage and Eagle River.
O: 21JUL2026 01:21:24 61.2N 150.4W ML=3.1 EMSC SOUTHERN ALASKA
NEIC reported an earthquake of M 5.0 in Samoa was felt with intensity up to II-III in the area(s) of Samoa near Gataivai.
This is the strongest of a series of moderate quakes in the region today
which are located near 106 degrees from Venezuela and at the fourth node
(90 degrees) from Chiapas. Other regional events occurred with M 4.8 in
Vanuatu (103 degrees from Chiapas), M 4.9 in Tonga (node 4 from Chiapas);
South of Fiji with M 4.6 (90 degrees from Chiapas).
The earthquake in Samoa occurred within a couple of minutes of local solar
noon and the M 4.6 south of Fiji was also a local solar noon earthquake.
These were likely promoted by tidal and/or geomagnetic effects which maximize
near this hour.
O: 20JUL2026 23:37:57 14.9S 172.9W MB=5.0 EMSC SAMOA ISLANDS
O: 20JUL2026 12:53:49 14.6S 167.4E MB=4.8 EMSC VANUATU
O: 21JUL2026 00:25:28 23.7S 177.3W MB=4.6 EMSC SOUTH OF FIJI ISLANDS
O: 20JUL2026 21:11:36 19.7S 174.9W MB=4.9 EMSC TONGA
NEIC reported an earthquake of M 4.2 in Guangxi, China was felt with intensity up to II-III in the area(s) of Guangxi, China in Nanning and Pumiao.
This epicenter is at 146 degrees from Venezuela and may have been promoted
by energy from that source.
O: 20JUL2026 14:40:50 22.5N 107.8E MB=4.2 EMSC GUANGXI, CHINA
NEIC reported an earthquake of M 4.1 in North Island, New Zealand was felt with intensity up to II-III in the area(s) of North Island, New Zealand near Hicks Bay.
This earthquake occurred within minutes of local solar midnight and may
have been promoted by tidal and/or geomagnetic stresses.
O: 20JUL2026 12:15:23 36.8S 178.2E MB=4.1 EMSC OFF E. COAST OF N. ISLAND, N.Z
NEIC reported earthquakes of M 5.2 and M 4.8 in Trinidad and Tobago and Venezuela was felt with intensity up to II-III in the area(s) of Trinidad and Tobago and Venezuela in Grenada at Saint Davids, Saint George's and in Trinidad and Tobago at Tunapuna and Port of Spain and possibly in Chacao, Miranda, Venezuela.
The larger of these at M 5.2 was felt in Trinidad and Tobago at Chaguanas, Mucurapo Diego Martin, Port of Spain, Scarborough, Tunapuna, Sangre Grande and in Saint Vincent and the Grenadines at Biabou Charlotte.
It is located at 30.0 degrees (node 12) from Chiapas and was probably
promoted by energy from that source.
O: 20JUL2026 09:45:01 11.3N 60.6W MW=5.2 EMSC TOBAGO, TRINIDAD AND TOBAGO
O: 20JUL2026 10:54:57 10.7N 62.2W mb=4.8 EMSC SUCRE, VENEZUELA
EMSC reported an earthquake of M 4.6 in Valparaiso, Chile was felt with intensity up to II-III in the area(s) of Valparaiso, Chile in Cartagena, Vina del Mar, Lo Prado, Santiago.
This earthquake occurred within minutes of local solar midnight and may
have been promoted by tidal and/or geomagnetic stresses.
This epicenter is at the seventh node (51.4 degrees) from Chiapas and may
have been promoted by energy from that source.
O: 21JUL2026 04:28:28 33.3S 72.2W ML=4.6 EMSC OFFSHORE VALPARAISO, CHILE
NEIC reported an earthquake of M in was felt with intensity up to II-III in the area(s) of
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM FAUSTO (06E)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS FAUSTO 2026-07-21 00:00 UT 15.3N 117.5W 80 kts Pacific Southwest of Mexico
TS Fausto (06E) continued today southwest of Baja California, Mexico in the north Pacific Ocean with winds up to 80 kts. It is expected to track to the west over the next several days reaching hurricane force winds by July 23 with gusts up to 115 kts but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Fausto is near 15S 63E in the South Indian Ocean where some enhanced seismicity is unlikely but possible as this storm moves to the west and intensifies.
TROPICAL STORM BERTHA (02L)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS BERTHA 2026-07-21 00:00 UT 28.5N 86.0W 45 kts South of Florida
TS Bertha (02L) formed today south of Florida (US) in the northern Gulf of America (Mexico) with winds up to 45 kts. It is expected to track to the west over the next several days but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Bertha is near 29S 94E in the South Indian Ocean where enhanced seismicity is unlikely at this time. Landfall is expected in two days near New Orleans, Louisiana.
TROPICAL STORM ELIDA (05E)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS ELIDA 2026-07-21 00:00 UT 25.6N 127.1W 50 kts Pacific Southwest of Mexico
TS Elida (05E) continued today west of Baja California, Mexico in the north Pacific Ocean with winds up to 50 kts. It is expected to track to the north over the next days dissipating over the Pacific but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Elida is near 26S 53E in the South Indian Ocean where enhanced seismicity is unlikely at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 20, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
8400 0739 0746 0755 C2.1 (July 20, 2026) 1.8E-03
Chiapas M 4.1 07:41 UT
Oaxaca M 4.0 07:58 UT
8410 0834 0840 0845 C1.7 (July 20, 2026) 1.2E-03
Arkansas M 2.6 08:40 UT
Valparaiso M 4.0 08:29 UT
8480 1208 1215 1218 C1.6 (July 20, 2026) 9.6E-04
North Is. New Zealand M 4.1 12:15 UT
8490 1220 1240 1256 C2.9 (July 20, 2026) 5.2E-03
Chiapas M 4.3 12:35 UT
Vanuatu M 4.8 12:53 UT
8510 1429 1436 1440 M2.5 (July 20, 2026) 8.0E-03
Antofagasta M 2.8 14:30 UT
Andreanof Is. M 4.9 14:37 UT
Guangxi, China 14:40 UT
8560 1516 1520 1525 C7.1 (July 20, 2026) 3.0E-03
Chiapas M 4.2 15:15 UT
8580 1712 1717 1728 C3.2 (July 20, 2026) 2.6E-03
Andreanof Is. M 3.4 17:11 UT
8590 1907 1920 1926 M1.1 (July 20, 2026) 5.7E-03
Papua M 4.6 19:07 UT
Mariana Is. M 4.9 19:14 UT
Kamchatka M 4.3, 4.1 19:19, 19:23 UT
El Salvador M 4.3 19:34 UT
8610 2127 2141 2157 C2.9 (July 20, 2026) 3.7E-03 *
North Atlantic M 5.6 21:29 UT
Antofagasta M 2.5 21:43 UT
Chiapas M 4.0 21:56 UT
8620 2215 2225 2231 M3.4 (July 20, 2026) 1.7E-02
Chiapas M 4.2 22:37 UT
Antofagasta M 2.7 22:24 UT
8640 2317 2324 2333 C7.6 (July 20, 2026) 5.4E-03
Chiapas M 4.2 23:17 UT
Hokkaido M 4.0 23:18 UT
Samoa M 5.0 23:37 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: unsettled July 21 minor storms July 22 active July 23. Solar M-flare chance: 40% X-class: 5% proton storm: 5%
AP Indicies: global: 4, high: 2, mid-latitude: 4, time of max k: 16:00-21:00 UT; Max k: 2 Global Kp 1.33 2200-2400, July 20; Sunspot Number: 74; Radio Flux: 137
A moderate geomagnetic storm is expected to commence early on UT July 21. This
is likely to reach Kp levels of 5. It could help promote seismicity in areas
which are sub-solar at the time of commencement. A series of M-class solar
flares occurred today. These are the first M-class flares since an M1.1 on July 12, 2026 (#7440).
Flare 8620 today (M 3.5) is the strongest solar flare since an M 4.0 on July 7, 2026 (#6430).
GOES Magnetometers showed strong fluctuations in geomagnetic field starting
with a pulse peaking about 00:00 on July 21, 2026 in both GOES-18 and GOES-19
instruments. This may signal the beginning of the geomagnetic storm and
would suggest areas near the IDL and Greenwich Meridian may see enhanced
seismicity at this time. Hp30 indicies indicate the beginning of the storm
with Hp30 index reaching 3.33 around 03:00-03:30 UT but a stronger storm
starting about 08:45 through 11:30 UT on July 21 reaching Kp of 4.
July 20, 2026
Notable earthquakes and events:
The strongest earthquake of the day was an M 5.6 in the Vancouver Island area of Canada.
NEIC reported this earthquake was felt with intensity IV in British Columbia, Canada at Port MacNeill and lesser intensity in Victoria and Port Hardy.
The last earthquake within about 200 km of this epicenter near Vancouver
Island with M>=5.6 occurred as an M 6.4 on July 11, 2024.
This epicenter is at 109 degrees from the M 6.3 in New Zealand two days ago
and joins a number of other expected events at this distance range from
New Zealand including the M 7.3 in Chiapas, Mexico and the M 5.5 in Central
Peru (see previous issues of this summary for details). When the earthquake
in New Zealand occurred this summary noted this possibility as:
"Today's earthquake map on this website shows nodal areas where likely seismic enhancement may
occur following the event in New Zealand. The distance at 103 degrees
is notable as it passes through active areas of California, Mexico and Peru
among others. It is likely that enhanced seismicity in those areas will
continue following today's event in New Zealand." (July 17, 2026)
It appears that today's earthquake in Vancouver may be third in this triad
of events (noted as possibly in California) in the forecast above.
At the time of the M 6.4 of July 11, 2024 this summary noted:
"The strongest earthquake in the world today was an M 6.4 in the series in Vancouver
Island, British Columbia which began July 4, 2024. NEIC reported it was lightly
felt with moderate intensity up to IV in Tofino, Canada. EMSC reported light
shaking in Chilliwack, Canada. Several moderate aftershocks - including
an M 5.4 - were also felt in this region. This summary has extensively
covered this swarm in previous issues as in the last summary which noted:
"This epicenter (in Mindanao, Philippines) is near 100 degrees from the M 6.7 yesterday south of Africa and at the
same distance from the continuing swarm of earthquakes in the Vancouver Island
area of British Columbia, Canada. With an earthquake at this depth these
areas are at the shadow zone boundary for S- and P-waves (normally 102-103 degrees
distance for earthquakes that occur near the surface. Thus the event today
in Mindanao is considered a triggered earthquake from the M 6.7 South of Africa
yesterday. Further activity (perhaps) a strong earthquake in Vancouver is
also likely at this time due to the concentration of energy from the area
south of Africa. A further complication perhaps leading to additional
enhancement in Vancouver, B.C. is the track of Hurricane Beryl. The remnants
Hurricane Beryl is now located over the northeastern U.S. where it has dropped
large reserves of water over the past two days. This summary has long been
a proponent of the theory that effects of strong meteorological events
(nor'easters and hurricanes, for example) affecting the Northeast U.S.
can trigger strong earthquakes on the Pacific-North American plate boundary
in particular from California north to Alaska. ..." (July 11, 2024)
In addition to being at 109 degrees from New Zealand, and at the sixth node (60 degrees) from Honshu, Japan this epicenter in Vancouver
is at the eighth node (45 degrees) from Chiapas, Mexico and had been
identified in the far-field forecast from Chiapas in this summary as possible at:
"Node 8 (45 degrees)
Eastern Mexico to Vancouver," (July 17-18, 2026)
O: 20JUL2026 06:41:31 49.5N 129.2W MW=5.6 EMSC VANCOUVER ISLAND, CANADA REGIO
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake yesterday. That earthquake was extensively
discussed in this summary in previous issues and readers are referred
to those issues for further details as presented at that time for example:
The strongest aftershock in Chiapas in the past 24 hours occurred as an M 5.5
within minutes of local solar noon and at the sub-solar latitude for July 20 making it a sub-solar earthquake. If this sounds familiar to regular
readers of this summary that may be because it is. This scenario was
discussed in the previous issue of this summary as:
"If the earthquake in Chiapas was promoted by strong tidal stresses associated
with the sub-solar conditions at the time of occurrence it is reasonable
to believe that these similar conditions near local solar noon in Chiapas,
Mexico are likely to generate the strongest aftershocks in the short term
This appears to be the case today. The strongest aftershock in the area since
the last issue of this summary occurred as an M 5.7 within minutes of
local solar noon in Chiapas and was probably promoted by vertical tidal stresses
which maximized at that time. This type of triggering may continue for
another day or two while the area is still unstable.
O: 18JUL2026 17:26:29 14.3N 92.8W Mw=5.7 EMSC OFFSHORE CHIAPAS, MEXICO " (July 19, 2026)
O: 19JUL2026 17:45:14 14.2N 92.9W Mw=5.5 EMSC OFFSHORE CHIAPAS, MEXICO
These epicenters in Chiapas, Mexico are at 104-106 degrees from New Zealand and Honshu, Japan and at
the third node (120 degrees) from the South Geomagnetic Pole and may have
been promoted by energy from these sources.
In particular, at 106 degrees from the Epicenter yesterday in South Island,
New Zealand this summary had anticipated this activity in Chiapas in previous
issues as for example in previous issues of this summary:
"Today's earthquake map on this website shows nodal areas where likely seismic enhancement may
occur following the event in New Zealand. The distance at 103 degrees
is notable as it passes through active areas of California, Mexico and Peru
among others. It is likely that enhanced seismicity in those areas will
continue following today's event in New Zealand." (July 17, 2026)
Note that Peru was included in this forecast summary two days ago.
Enhanced seismicity in the area at this time had also been anticipated in this summary
in earlier issues due to the sub-solar nature of this epicenter at this time - for example:
"Other seismic regions nearing sub-solar conditions in the next several days
include Guerrero and central Mexico and northern Philippines among others.
Moderate seismic enhancement in these areas is possible at this time due
to sub-solar stresses." (July 11, 2026)
Today's mainshock occurred near local solar noon and within about 1 degree
of the sub-solar latitude for July 18. The nature of sub-solar triggering
in Chiapas, Mexico had been elaborated on in this summary on July 14, 2023
when an M 6.3 near today's epicenter near the time of the new moon.
At the time it was noted in this summary.
These epicenters in Chiapas, Mexico are located at 105-106 degrees from
the M 6.3 in New Zealand and the M 7+ in northern Honshu and were probably
promoted by energy from those sources (see above).
Following is a listing of aftershocks in the past 24 hours in the area of eastern Mexico and Guatemala
with M>=4.0. This is an active aftershock sequence and is expected to continue
to decline but remain active for several more days.
O: 19JUL2026 22:57:33 13.5N 93.0W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 12:06:27 13.7N 93.1W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 19:53:37 13.7N 93.0W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 15:11:38 13.8N 93.4W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 19:38:24 13.8N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 07:02:04 13.9N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 23:48:43 13.9N 93.1W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 08:10:05 14.0N 93.0W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 09:53:47 14.0N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 10:18:27 14.0N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 16:01:38 14.0N 92.9W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 16:31:59 14.0N 92.7W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 20JUL2026 01:06:14 14.0N 93.5W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 07:20:23 14.1N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 09:01:36 14.1N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 09:05:03 14.1N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 13:33:31 14.1N 93.1W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 15:48:11 14.1N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 16:05:00 14.1N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 18:40:14 14.1N 93.1W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 21:15:36 14.1N 93.4W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 22:11:15 14.1N 93.4W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 03:50:22 14.1N 93.2W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 04:00:17 14.1N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 08:55:22 14.2N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 10:03:24 14.2N 93.6W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 10:39:36 14.2N 93.4W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 15:20:39 14.2N 92.7W ML=4.5 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 15:44:18 14.2N 92.7W mb=4.5 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 17:45:14 14.2N 92.9W Mw=5.5 EMSC OFFSHORE CHIAPAS, MEXICO
O: 20JUL2026 02:09:40 14.2N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 04:22:32 14.2N 93.4W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 06:40:48 14.2N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 07:41:28 14.2N 93.2W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 14:01:11 14.3N 93.2W mb=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 22:41:36 14.3N 93.2W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 20JUL2026 00:32:08 14.3N 93.6W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 20JUL2026 07:19:44 14.4N 92.9W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 08:51:23 14.5N 93.2W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 20JUL2026 01:53:43 14.5N 93.2W Mw=4.7 EMSC OFFSHORE CHIAPAS, MEXICO
The series of moderate earthquakes in northern and western Iran continued
today. Today's events included an M 5.2 and an M 4.9 in the Javanrud area of western Iran.
NEIC reported they were felt with moderate intensity III in Bakhtaran, Kermanshah and Ecbatana, Hamadan, Iran.
EMSC reported moderate shaking in Iran at Tazehabad, Kermanshah, Kahriz, Sonqor, As Sulaymaniyah, Hamadan, Bukan, Marivan, Kabudarahang and in Derbendixan and Khanaqin, Iraq.
The M 5.2 is the strongest in western Iran within about 200 km of today's
epicenter since an M 5.3 on June 6, 2021. The last event of significantly larger magnitude
in this area was an M 6.0 (and aftershocks) on August 25, 2018 and an M 5.9
on July 22, 2018 eight years ago. At the time this summary noted:
The strongest seismicity in the world today continued in Iran. These occurred
at three separate epicenters with moderate to large events and included an M 5.9, an M 5.5 and M 5.4. An event of M 5.5 in southern Iran was reported felt with intensity V in Kerman, and II-III in Bahramabad and Giroft, Kerman, Iran and possibly in Irbil, Iraq.
Strong earthquakes in this area can help promote higher magnitudes of quake
in the San Andreas/Central California area because wavefronts from Iran are
parallel to this fault zone when they arrive in the area of California.
Much of this activity is at the third node (120 degrees) from Hawaii and may
have been promoted by energy from that area.
The earthquake in western Iran of M 5.9 was reported with intensity VIII in Kermanshah and VI in Halubah and Javanrud and Aslamabad. Intensity V shook Kordestan with lesser shaking in Ilam, Diyala, Iran. It was also felt in Iraq with intensity II-IV at Kirkuk, Balad and other communities within about 300 km of the epicenter.
Some damage was incurred in the epicentral zone in western Iran in the Kermanshah area.
This is the largest earthquake in western Iran within about 200 km of this epicenter
since an M 7.3 on November 12, 2107 and is probably the strongest aftershock to date of that event. The only
other activity in the region since 1990 with M>=5.9 occurred on August 8, 2014 with M 6.0 and 6.2 about 250 km to the southwest of today's epicenter." (July 22, 2018)
Today's series began yesterday and was reported in the previous issue of this
summary as:
"A series of moderate earthquakes were recorded in northern and western Iran
today. EMSC reported they woke people in Iran at Ahvaz and Dezful. These are in areas where bombing in the current hostilities in that
area is currently active. An M 4.8 and M 4.9 in western Iran and M 4.2 near
Tehran in northern Iran are in seismic areas and could have been promoted
by instabilities related to shaking from the current war in the area. More
such activity is therefore likely until the current waves of bombing cease.
The most likely continuing seismicity will be in western Iraq as these
epicenters are at 120.0 degrees from Chiapas (node 3) and at 105 degrees
from Venezuela and may have been promoted by energy from those sources.
The earthquake in northern Iran is also at 120 degrees from Chiapas, Mexico.
O: 19JUL2026 02:25:22 32.3N 47.4E MB=4.8 EMSC IRAN-IRAQ BORDER REGION
O: 19JUL2026 02:25:20 32.5N 48.6E MW=4.9 EMSC WESTERN IRAN
O: 19JUL2026 05:38:13 37.2N 54.0E MB=4.2 EMSC NEAR THE COAST OF NORTHERN" (July 19, 2026)
Today's epicenters are located at 103 degrees from Venezuela and near the third node from
Chiapas, Mexico and may have been promoted by energy from those sources.
O: 20JUL2026 03:48:50 34.5N 46.4E MW=5.2 EMSC WESTERN IRAN
O: 20JUL2026 03:43:18 34.6N 46.4E Mw=4.9 EMSC WESTERN IRAN
NEIC reported an earthquake of M 4.6 in Colombia was felt with intensity up to II-III in the area(s) of Colombia in Bucaramanga, Santander.
EMSC reported moderate to strong shaking in Colombia at Piedecuesta, Floridablanca, Bucaramanga, Abrego, San Rafael, Samana, Soacha.
O: 20JUL2026 01:44:15 6.8N 73.1W MB=4.6 EMSC NORTHERN COLOMBIA
EMSC reported a series of moderate earthquakes of M 4.7, 4.8, 4.0, 3.8 south of Java and northwest of Australia was felt with intensity up to IV in the area(s) of Java at Bogor and Soreang, Terasa.
The M 3.8 was felt in Bali, Indonesia at Banjar Petuludesa. These events are located within several hundred km of the exact antipode
of the Venezuelan earthquakes of June 24, 2026 and were probably promoted
by antipodal energy concentration following those earthquakes in Venezuela.
O: 19JUL2026 08:11:03 7.7S 106.5E MB=4.8 EMSC JAVA, INDONESIA
EMSC reported an earthquake of M 4.5 in Afghanistan was felt with intensity up to IV in the area(s) of Afghanistan in Kabul.
This epicenter is near the third node (120 degrees) from Venezuela, New Zealand
and may have been promoted by constructive energy interference
from those sources.
O: 19JUL2026 22:58:43 36.2N 70.6E MB=4.5 EMSC HINDU KUSH REGION, AFGHANISTAN
EMSC reported an earthquake of M 4.1 in Kyrgyzstan was felt with intensity up to IV in the area(s) of Kyrgyzstan in Naryn, Kochkor, Chuy, Balykchy, Kant, Bishkek, Tyup and Otengen Batyra and in Kazakhstan at Chemolgan, Almaty, Burunday, Pervomayka, Talghar.
This epicenter is near the third node (120 degrees) from Venezuela, New Zealand
and Chiapas, Mexico and may have been promoted by constructive energy interference
from those sources.
O: 19JUL2026 20:41:04 41.7N 75.8E MW=4.1 EMSC KYRGYZSTAN
EMSC reported an earthquake of M 4.2 in Valparaiso, Chile was felt with intensity up to IV in the area(s) of Valparaiso, Chile in Vina del Mar.
O: 19JUL2026 14:45:29 32.5S 72.2W ML=4.2 EMSC OFFSHORE VALPARAISO, CHILE
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM FAUSTO (06E)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS FAUSTO 2026-07-20 00:00 UT 12.3N 114.5W 50 kts Pacific Southwest of Mexico
TS Fausto (06E) formed today southwest of Baja California, Mexico in the north Pacific Ocean with winds up to 50 kts. It is expected to track to the west over the next several days reaching hurricane force winds by July 22 with gusts up to 115 kts but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Fausto is near 12S 66E in the South Indian Ocean where some enhanced seismicity is possible as this storm moves to the west and intensifies.
TROPICAL STORM ELIDA (05E)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS ELIDA 2026-07-20 00:00 UT 23.6N 126.5W 55 kts Pacific Southwest of Mexico
TS Elida (05E) continued today southwest of Baja California, Mexico in the north Pacific Ocean with winds up to 55 kts. It is expected to track to the north over the next several days but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Elida is near 24S 54E in the South Indian Ocean where enhanced seismicity is likely at this time.
A tropical cyclone may be forming north of the Santa Cruz Islands in the south Pacific. This storm is currently at 5S 161E north of the Solomon Islands with winds up to 30 kts. It is not expected to significantly enhance regional seismicity at this time. The antipode is at 5N 19W - an area near the central mid-Atlantic Ridge where moderate seismic enhancement is possible if this storm intensifies to a Tropical Storm.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 19, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
8250 1825 1845 1848 C1.3 (July 19, 2026) 2.0E-03
Chiapas M 4.4 18:40 UT
So. Is. NZ M 3.7 18:34 UT
8260 1848 1911 1924 C1.8 (July 19, 2026) 3.8E-03
Kamchatka M 4.3 19:29 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: quiet July 19-20 active July 21. Solar M-flare chance: 15% X-class: 1% proton storm: 1%
A sharp decline in the intensity of the geomagntic field as measured on the GOES-18
magnetometer occurred starting about 06:00 UT on July 20, 2026 but an arcjet
maneuver was not required to correct the orbit of this satellite. GOES-18 is a geostationary
satellite stationed at 137 West longitude and is often sensitive to
geomagnetic changes near this longitude. This geomagnetic decline continued
to about 07:30 UT reaching the lowest field reading at 71 nT in the past four days.
The earthquake of M 5.6 in the Vancouver Island area (at 130W) occurred
during this geomagnetic excursion. The Kp and Hp30 indices did not exceed
2 in the past 24 hours.
AP Indicies: global: 4, high: 1, mid-latitude: 4, time of max k: 16:00-21:00 UT; Max k: 2 Global Kp 1.33 0600-0900, July 19; Sunspot Number: 44; Radio Flux: 119
July 19, 2026
Notable earthquakes and events:
An earthquake of M 5.5 in Peru hit the mountainous Junin region in Chupaca province, Peru.
NEIC reported moderate damage and intensity VII in Junin, Peru at Chupaca and Huancayo and VI in Sicaya with light shaking as far as Lima.
Immediate reports indicate at least 28 homes were destroyed with an additional
19 badly damaged. More than 300 people were displaced. The death toll from
this earthquake currently stands at an official count of 6 according to
early reports from Associated Press. Like the earthquake in Chiapas, Mexico
earlier (see below) in the day this epicenter is also at 100 degrees from the M 6.3 in
New Zealand the day before that. This earthquake occurred within a minute
of moderate earthquakes in western Iran (see below).
The last earthquake in Peru within about 200 km of today's epicenter with
M>=5.5 occurred on November 5, 2024. The last earthquake of significantly
larger magnitude in the region was an M 8.0 on August 15, 2007.
At the time of the November, 2024 event this summary noted:
"A moderately strong to strong earthquake occurred today with M 5.7 in the areas of
Central Peru. NEIC reported widely felt in Central and southern Peru with maximum intensity VI in Peru at Huancavelca, Huancayo, Nuevo Imperial, Lima; IV in Pampas; and II-III in Lircay, Chincha Alta, Acobamba, Santa Maria, Nicolas de Pierola, Arequipa, Ayacucuo, San Luis, Lima.
EMSC reported strong intensity shaking in Peru at Ica, Asia, Chorrillos, Barranco, San Isidro, and Lima.
This is the strongest earthquake in central Peru within about 250 km of this
epicenter since an M 5.9 on June 23, 2021. At the time this summary noted:
"A moderately strong earthquake of M 5.8 shook areas of central Peru today. It was reported by NEIC with intensity VII in Peru in Lima at Mala; VI in Chica, Micolas de Pereola, V in Nuevo Imperia, San Luis, Lima and IV in Santa Maria, Ricardo, Huancayo and Matucana.
This earthquake occurred within about an hour of local solar midnight and was probably
promoted by high tidal stresses which maximize near this hour. The area near
the coast of western South America is expected to see higher than normal seismicity
in the next week due to the timing of the upcoming full moon as noted in this summary:
...
Today's event in Peru is the strongest within about 200 km of this epicenter
since an M 6.1 on March 15, 2014. An M 6.9 on August 24, 2014 occurred about 350 km
to the outheast on August 24, 2014. A great earthquake of M 8.0 hit this region on August 15, 2007.
That quake was extremely damaging in the area ..." (June 23, 2021)
A pair of earthquakes of M 5.7-5.9 also hit this region on October 28 and 29, 2022
about 260 km south of today's epicenter as reported in this summary at the time as:
"Two moderately strong earthquakes of M 5.6-5.9 hit off the coast of central Peru today.
The mainshock of M 5.9-6.0 was reported by NEIC to have been felt with intensity II-III in Ica. Peru at Ica and Pisco and in San Luis Lima Provincias, Peru with intensity II.
NEIC reported the M 5.8-5.9 aftershock was felt with intensity III in Ica Peru at Vista Alegre and Pisco.
A foreshock of to the second event of M 5.8 of M 5.3 was reported felt with intensity II in Ica, Peru.
Hours earlier a foreshock (M 4.9) to the entire sequence was felt with intensity
IV in Lima and III in San Luis, Peru. The Press reported light shaking and damage
in the coast of Central Peru area. The last earthquake within about 200 km of
these mainshocks in Peru with M>=5.9 occurred on March 15, 2014 with M 6.1." (October 29, 2024, November 5, 2024)
O: 19JUL2026 02:24:36 12.0S 75.3W MB=5.5 NEIC PERU
Aftershocks continued in the area of Chiapas, Mexico and Guatemala today
following the major M 7.3 earthquake yesterday. That earthquake was extensively
discussed in this summary in the previous issue and readers are referred
to that issue for further details as presented at that time for example:
"A major earthquake of M 7.3 occurred in the area south of Chiapas, Mexico today. It was followed
by a series of aftershocks including one of M 6.0. NEIC reported the mainshock was
felt with intensity VII in Quezaltenango, Guatemala at La Esperanza with moderate damage and V in Guatemala in Olintepeque, Palin, San Lucas, Quetzaltenango, Peten, Solola and in Mexico in Tapachula, Chiaspas and Oaxaca at Asuncion Ixtaltepec. Intensity IV was felt in Guerrero, Chiapas, Guatemala, El Salvador, Ecuador, Belize, and as far as 1000 km from the epicenter.
A moderate foreshock of M 4.7 occurred about an hour before the mainshock. NEIC
reported it was felt with intensity III in Guatemala, Chiapas, Mexico and San Salvador.
A stronger foreshock of M 5.0 occurred also at the epicenter of today's mainshock
on July 14, 2026 ..." (July 18, 2026)
and was reported in the summary at the time as:
These epicenters in Chiapas, Mexico are at 104-106 degrees from New Zealand and Honshu, Japan and at
the third node (120 degrees) from the South Geomagnetic Pole and may have
been promoted by energy from these sources.
In particular, at 106 degrees from the Epicenter yesterday in South Island,
New Zealand this summary had anticipated this activity in Chiapas in previous
issues as for example in previous issues of this summary:
"Today's earthquake map on this website shows nodal areas where likely seismic enhancement may
occur following the event in New Zealand. The distance at 103 degrees
is notable as it passes through active areas of California, Mexico and Peru
among others. It is likely that enhanced seismicity in those areas will
continue following today's event in New Zealand." (July 17, 2026)
Note that Peru was included in this forecast summary two days ago.
Enhanced seismicity in the area at this time had also been anticipated in this summary
in earlier issues due to the sub-solar nature of this epicenter at this time - for example:
"Other seismic regions nearing sub-solar conditions in the next several days
include Guerrero and central Mexico and northern Philippines among others.
Moderate seismic enhancement in these areas is possible at this time due
to sub-solar stresses." (July 11, 2026)
Today's mainshock occurred near local solar noon and within about 1 degree
of the sub-solar latitude for July 18. The nature of sub-solar triggering
in Chiapas, Mexico had been elaborated on in this summary on July 14, 2023
when an M 6.3 near today's epicenter near the time of the new moon.
At the time it was noted in this summary.
If the earthquake in Chiapas was promoted by strong tidal stresses associated
with the sub-solar conditions at the time of occurrence it is reasonable
to believe that these similar conditions near local solar noon in Chiapas,
Mexico are likely to generate the strongest aftershocks in the short term
This appears to be the case today. The strongest aftershock in the area since
the last issue of this summary occurred as an M 5.7 within minutes of
local solar noon in Chiapas and was probably promoted by vertical tidal stresses
which maximized at that time. This type of triggering may continue for
another day or two while the area is still unstable.
O: 18JUL2026 17:26:29 14.3N 92.8W Mw=5.7 EMSC OFFSHORE CHIAPAS, MEXICO
These epicenters in Chiapas, Mexico are located at 105-106 degrees from
the M 6.3 in New Zealand and the M 7+ in northern Honshu and were probably
promoted by energy from those sources (see above).
O: 18JUL2026 15:38:38 13.5N 92.3W ML=4.0 EMSC OFFSHORE GUATEMALA
O: 18JUL2026 21:59:50 13.8N 92.6W ML=4.0 EMSC OFFSHORE GUATEMALA
O: 18JUL2026 08:54:00 13.9N 93.3W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 09:17:19 13.9N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 18:17:53 13.9N 93.1W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 21:46:33 13.9N 93.1W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 07:02:04 13.9N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 07:55:10 14.0N 93.4W ML=4.6 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 10:32:16 14.0N 92.9W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 10:47:19 14.0N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 11:30:14 14.0N 92.6W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 13:28:37 14.0N 93.4W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 21:06:15 14.0N 93.0W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 22:38:03 14.0N 93.2W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 04:15:26 14.0N 92.9W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 04:35:23 14.0N 92.9W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 04:54:34 14.0N 93.6W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 08:10:05 14.0N 93.0W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 09:53:47 14.0N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 10:18:27 14.0N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 08:59:33 14.1N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 09:51:33 14.1N 92.5W ML=4.3 EMSC OFFSHORE GUATEMALA
O: 18JUL2026 10:26:50 14.1N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 11:03:12 14.1N 93.4W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 22:15:46 14.1N 93.2W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 05:22:32 14.1N 93.4W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 05:36:52 14.1N 93.2W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 06:17:45 14.1N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 07:20:23 14.1N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 09:01:36 14.1N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 09:05:03 14.1N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 07:20:47 14.2N 93.0W mb=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 10:35:25 14.2N 93.2W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 11:13:38 14.2N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 11:49:20 14.2N 92.9W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 12:42:38 14.2N 93.2W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 16:55:57 14.2N 92.9W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 21:53:07 14.2N 93.3W ML=3.9 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 22:11:02 14.2N 93.3W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 01:47:25 14.2N 92.9W Mw=5.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 08:55:22 14.2N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 10:03:24 14.2N 93.6W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 10:39:36 14.2N 93.4W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 07:27:16 14.3N 93.5W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 11:22:43 14.3N 93.2W ML=4.6 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 17:26:29 14.3N 92.8W Mw=5.7 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 22:54:16 14.3N 93.4W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 01:03:53 14.3N 93.1W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 02:01:30 14.3N 92.9W mb=4.6 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 02:18:56 14.3N 92.8W Mw=5.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 04:38:59 14.3N 92.4W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 05:03:17 14.3N 93.3W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 19JUL2026 10:14:59 14.3N 93.2W ML=3.7 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 07:46:19 14.4N 92.9W mb=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 21:35:29 14.4N 92.7W mb=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 22:49:26 14.4N 93.3W mb=4.6 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 23:38:01 14.4N 92.5W mb=4.5 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 09:59:21 14.5N 92.9W Mw=5.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 17:01:33 14.5N 92.9W Mw=4.6 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 03:27:20 14.5N 92.9W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 08:51:23 14.5N 93.2W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 19JUL2026 00:33:50 14.7N 93.2W mb=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 09:34:21 14.8N 92.9W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 11:57:20 15.2N 94.3W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 10:56:04 13.5N 90.7W ML=4.1 EMSC OFFSHORE GUATEMALA
A series of moderate earthquakes were recorded in northern and western Iran
today. EMSC reported they woke people in Iran at Ahvaz and Dezful. These are in areas where bombing in the current hostilities in that
area is currently active. An M 4.8 and M 4.9 in western Iran and M 4.2 near
Tehran in northern Iran are in seismic areas and could have been promoted
by instabilities related to shaking from the current war in the area. More
such activity is therefore likely until the current waves of bombing cease.
The most likely continuing seismicity will be in western Iraq as these
epicenters are at 120.0 degrees from Chiapas (node 3) and at 105 degrees
from Venezuela and may have been promoted by energy from those sources.
The earthquake in northern Iran is also at 120 degrees from Chiapas, Mexico.
O: 19JUL2026 02:25:22 32.3N 47.4E MB=4.8 EMSC IRAN-IRAQ BORDER REGION
O: 19JUL2026 02:25:20 32.5N 48.6E MW=4.9 EMSC WESTERN IRAN
O: 19JUL2026 05:38:13 37.2N 54.0E MB=4.2 EMSC NEAR THE COAST OF NORTHERN
NEIC reported an earthquake of M 4.9 in the southern East Pacific Rise was not felt in this remote area.
This epicenter is at 45.0 degrees from Chiapas, Mexico (node 8) and near the
sixth node (60 degrees) from Venezuela and New Zealand and may have been
promoted by energy from those sources.
O: 18JUL2026 11:12:57 24.4S 116.1W MW=4.9 NEIC SOUTHERN EAST PACIFIC RISE
NEIC reported an earthquake of M 4.3 in Crete, Greece was felt with intensity up to II-III in the area(s) of Crete, Greece
EMSC reported moderate shaking in Crete, Greece at Agioi Theodoroi, Irakleion, Nea Alikarnassos, Ano Arhanes, Stalis, Rethymno, Kalyves, Chania, Daratsos.
This epicenter is at 103 degrees from Chiapas, Mexico and may have been
promoted by energy from that source.
O: 18JUL2026 09:04:09 35.7N 25.1E ML=4.3 EMSC CRETE, GREECE
NEIC reported an earthquake of M 3.6 in Nevada was felt with intensity up to II-III in the area(s) of Nevada in Amargosa Valley.
O: 18JUL2026 07:34:02 36.7N 116.3W ML=3.5 EMSC NEVADA
NEIC reported an earthquake of M 4.5 in the Central Mid-Atlantic Ridge was not felt with intensity up to II-III in the area(s) of the Central Mid-Atlantic Ridge.
This epicenter is at the fifth node (72 degrees) from Chiapas and may have
been promoted by energy from that source.
O: 18JUL2026 06:26:08 0.9S 21.5W MB=4.5 EMSC CENTRAL MID-ATLANTIC RIDGE
NEIC reported an earthquake of M 4.3-4.7 in Kodiak, Alaska was felt with intensity up to II-III in the area(s) of Kodiak, Alaskan the area of Akhiok.
This epicenter is at the sixth node (60 degrees) from Chiapas, Mexico and
105 degrees from New Zealand and may have been promoted by energy from those
sources.
O: 18JUL2026 07:20:42 56.1N 153.3W MB=4.7 EMSC KODIAK ISLAND REGION, ALASKA
NEIC reported an earthquake of M 2.9-3.1 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in Kelseyville, Healdsburg, Geyserville and Middletown.
O: 19JUL2026 05:11:30 38.8N 122.8W ML=2.9 EMSC NORTHERN CALIFORNIA
O: 19JUL2026 05:11:30 38.8N 122.8W ML=3.1 NEIC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 5.5 in the Scotia Sea south of South America was not felt in this remote area.
This is the strongest earthquake in the Scotia Sea within about 250 km
of this epicenter since an M 5.6 on November 28, 2019. An M 7.8 hit this
area on November 17, 2013. At the time this summary reported:
"After a series of foreshocks including events of M 6.1 and 6.8 over the past
three days, an major earthquake of M 7.3-7.8 hit the Scotia Sea early on
November 17. This event is almost certainly tidally triggered as it occurred
within hours of the full moon alignment at the longitude of strongest tidal effects. It
is the strongest earthquake ever to hit this region of the South Atlantic
near Antarctica." (November 17, 2013)
This epicenter in the Scotia Sea is at the fifth node from New Zealand
and Venezuela (72 degrees) and was probably promoted by constructive interference
of energy from those sources.
O: 18JUL2026 19:50:37 60.7S 51.0W MW=5.5 EMSC SCOTIA SEA
NEIC reported an earthquake of M 5.1 in the Cayman Islands, Caribbean was felt with intensity up to II-III in the area(s) of the Cayman Islands, Caribbean in West Bay and George Town, Grand Cayman.
This event occurred within about an hour of local solar noon and at a latitude
which was near subsolar on this date and was probably promoted by
tidal stresses associated with these subsolar conditions.
O: 18JUL2026 16:08:44 17.9N 81.6W MW=5.1 EMSC CAYMAN ISLANDS REGION
EMSC reported an earthquake of M 3.5 in Poland was felt with intensity up to IV in the area(s) of Poland in Polkowice and Jerzmanowa and Glogow.
This epicenter is at the fourth node (90 degrees) from Chiapas and may have been
promoted by energy from that source.
O: 18JUL2026 11:27:42 51.5N 16.1E MB=3.5 EMSC POLAND
EMSC reported an earthquake of M 2.3 in Santa Monica, California was felt with intensity up to IV in the area(s) of Santa Monica, California in Venice, Westwood, Culver City, and Marina del Rey.
O: 18JUL2026 07:35:02 34.0N 118.5W ML=2.3 EMSC SANTA MONICA BAY, CALIFORNIA
EMSC reported a series of moderate earthquakes of M 4.7, 4.8, 4.0, 3.8 south of Java and northwest of Australia was felt with intensity up to IV in the area(s) of Java at Bogor and Soreang, Terasa.
The M 3.8 was felt in Bali, Indonesia at Banjar Petuludesa. These events are located within several hundred km of the exact antipode
of the Venezuelan earthquakes of June 24, 2026 and were probably promoted
by antipodal energy concentration following those earthquakes in Venezuela.
O: 18JUL2026 20:16:58 13.1S 113.4E ML=4.7 EMSC NORTHWEST OF AUSTRALIA
O: 19JUL2026 08:11:03 7.7S 106.5E MB=4.8 EMSC JAVA, INDONESIA
O: 18JUL2026 15:46:05 10.8S 110.2E ML=4.0 EMSC SOUTH OF JAVA, INDONESIA
O: 19JUL2026 02:37:24 10.6S 112.6E ML=3.8 EMSC SOUTH OF JAVA, INDONESIA
EMSC reported an earthquake of M 4.5 in Pakistan was felt with intensity up to IV in the area(s) of Pakistan in Quetta, Balochistan.
This epicenter is near the third node from New Zealand and Venezuela
and may have been promoted by constructive interference of energy from those sources.
O: 18JUL2026 18:26:37 30.4N 67.5E MB=4.5 EMSC PAKISTAN
EMSC reported an earthquake of M 4.8 in Tajikistan was felt with intensity up to IV in the area(s) of Tajikistan in Dushanbe.
This epicenter is at the third node (120 degrees) from Venezuela and New Zealand
and may have been promoted by constructive interference of energy from those sources.
O: 18JUL2026 10:36:17 37.9N 72.6E MB=4.8 EMSC TAJIKISTAN
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM FAUSTO (06E)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS FAUSTO 2026-07-19 00:00 UT 12.3N 114.5W 50 kts Pacific Southwest of Mexico
TS Fausto (06E) formed today southwest of Baja California, Mexico in the north Pacific Ocean with winds up to 50 kts. It is expected to track to the west over the next several days reaching hurricane force winds by July 22 with gusts up to 115 kts but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Fausto is near 12S 66E in the South Indian Ocean where some enhanced seismicity is possible as this storm moves to the west and intensifies.
TROPICAL STORM ELIDA (05E)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS ELIDA 2026-07-19 00:00 UT 20.6N 124.5W 65 kts Pacific Southwest of Mexico
TS Elida (05E) continued today southwest of Baja California, Mexico in the north Pacific Ocean with winds up to 65 kts. It is expected to track to the northwest over the next several days but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Elida is near 20S 56E in the South Indian Ocean where enhanced seismicity is likely at this time.
A tropical cyclone may be forming south of Mexico. This storm is currently at 11N 105W south of Michoacan, Mexico with winds up to 33 kts. It is not expected to significantly enhance regional seismicity at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 16, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
8050 0038 0120 0208 C2.2 (July 18, 2026) 1.0E-02
Wyoming M 2.6 00:39 UT
Sumatra M 4.5 00:50 UT
Chiapas M 5.1 01:49 UT
8080 0356 0405 0414 C2.3 (July 18, 2026) 1.9E-03
Ascension Is. M 4.8 04:07 UT
Chiapas M 4.2 04:09 UT
8130 2139 2152 2203 C1.5 (July 18, 2026) 1.7E-03
Primor'ye Russia M 4.0 21:54 UT
Chiapas M 3.2 21:53 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: quiet July 19-20 active July 21. Solar M-flare chance: 15% X-class: 1% proton storm: 1%
AP Indicies: global: 5, high: 3, mid-latitude: 4, time of max k: 16:00-21:00 UT; Max k: 2 Global Kp 1.67 0000-0300, July 18; Sunspot Number: 24; Radio Flux: 110
July 18, 2026
Notable earthquakes and events:
A major earthquake of M 7.3 occurred in the area south of Chiapas, Mexico today. It was followed
by a series of aftershocks including one of M 6.0. NEIC reported the mainshock was
felt with intensity VII in Quezaltenango, Guatemala at La Esperanza with moderate damage and V in Guatemala in Olintepeque, Palin, San Lucas, Quetzaltenango, Peten, Solola and in Mexico in Tapachula, Chiaspas and Oaxaca at Asuncion Ixtaltepec. Intensity IV was felt in Guerrero, Chiapas, Guatemala, El Salvador, Ecuador, Belize, and as far as 1000 km from the epicenter.
A moderate foreshock of M 4.7 occurred about an hour before the mainshock. NEIC
reported it was felt with intensity III in Guatemala, Chiapas, Mexico and San Salvador.
A stronger foreshock of M 5.0 occurred also at the epicenter of today's mainshock
on July 14, 2026 and was reported in the summary at the time as:
"NEIC reported an earthquake of M 5.0 in Chiapas, Mexico was felt with intensity up to II-III in the area(s) of Chiapas, Mexico in Guatemal City at Chinautla, Retalhuleu, Villa Nueva and in San JKuan la Laguna, and Panajachel, Solola, Olintepeque, Quezaltenango and in Villahermosa, Tabasco, Mexico.
EMSC reported strong shaking in Guatemala at San Bernardino, San Antonio Aguas Calientes, Villa Nueva, Mixco, and in Tapachula, Mexico.
O: 14JUL2026 01:19:59 14.8N 92.3W MB=5.0 NEIC CHIAPAS, MEXICO " (July 14, 2026)
The last earthquake in Chiapas, Mexico within about 200 km of today's
epicenter was an M 8.1 on September 8, 2017 and an M 7.3 on November 7, 2012. These
were the only such events with M>=7.3 in the area in the past 35 years.
At the time of the September, 2017 event this summary noted:
"A great earthquake of M 8.0 (EMSC) to 8.4 (UNAM) hit the area south of Oaxaca and Chiapas, Mexico today. It was
felt widely from Guatemala City to Mexico City and as far north as Belize.
This is the first earthquake in the world with M>=8.0 since an M 8.3 in
Central Chile on September 16, 2015 and prior to that an M 8.2 on April 1, 2014 in
the area of northern Chile. On average there is approximately two years between
great earthquakes such as this. The last earthquake of M>=8.0 within about 300
km of today's epicenter occurred on August 6, 1942 and M 8.4 on September 23, 1902 and April 19, 1902. These were M 8.3-8.4 events. This earthquake had been anticipated in previous issues of this report because
of several factors including the X9.3 solar flare yesterday, tidal stresses and
the severe geomagnetic storms. It occurred within about an hour of local solar
midnight, a time when these effects maximize. It is also directly west of
Hurricane Irma. Stresses on land associated with Irma probably were the major
promotional effect triggering this earthquake but previous summaries had pinpointed
it in some detail as follows:
GEOMAGNETIC PROMOTION:
The geomagnetic field was at severe storm conditions today. The AP level was 38.
High latitude geomagnetic field saw severe storm conditions with AP at 60.
riggering of strong seismicity from the severe geomagnetic storms
today and tomorrow is likely and includes the M 8.0-8.4 quake in eastern Mexico
today. A flare of X1.3 occurred near UT noon today,
This follows two similar quakes yesterday including an X9.3 the first X-class solar flare since an X2.1 on March 11, 2015 and the strongest
flare in at least 11 year, the solar cycle period. Strong seismicity is likely to be promoted 10-15 degrees from the geomagnetic
equator and at high auroral latitudes around September 10-13. This is most likely
in areas near 90 East and West longitudes including Indonesia and Central America
among others. This is a combined effect of weather, geomagnetic and tidal effects
associated with the full moon. The earthquake today in eastern Mexico appears
to confirm this analyses. The planetary K-index reached maximum of 8 today,
around 0400 UT on September 8. This is the first time it has reach 8 since
March 17, 2015, two and a half years ago. The simultaneity of this geomagnetic
storm and the M8+ at the same time in Chiapas, Mexico is powerful coincidental
evidence for a triggering relation as previously noted in this summary on
many occasions.
"Triggering of strong seismicity from the severe geomagnetic storms
today and tomorrow is likely to be delayed due in part to proton storms which
along with the electron influx will disrupt ring currents and induced telluric
currents. This in turn, will probably dial down seismicity until the ring currents
can reform around September 9-12. Strong seismicity is likely to be promoted 10-15 degrees from the geomagnetic
equator and at high auroral latitudes around September 10-13. This is most likely
in areas near 90 East and West longitudes including Indonesia and Central America
among others. This is a combined effect of weather, geomagnetic and tidal effects
associated with the full moon." (September 5-6, 2017)
"Hurricane Katia (Depression 13) continued today in the Gulf of Mexico with winds up to 80 kts. This
storm is expected to circle clockwise making a second landfall around September 9-10
on the coast of eastern Mexico. The long period of atmospheric low pressure
over the area north of Guerrero and Oaxaca, Mexico could promote a strong
earthquake in this area in the next week. A seismic watch is being called
for the area from Oaxaca west to Michoacan through September 11." (September 7, 2017)
"a moderate to strong earthquake around the Caribbean but this is not likely
until mid-September after Irma passes into the Caribbean." (September 6-7, 2017)
SOLAR FLARE EFFECTS:
"A flare of X9.8 occurred near UT noon today, this is the first X-class solar flare since an X2.1 on March 11, 2015 and the strongest
flare in at least 11 year, the solar cycle period. Strong seismicity is likely to be promoted 10-15 degrees from the geomagnetic
equator and at high auroral latitudes around September 10-13. This is most likely
in areas near 90 East and West longitudes including Indonesia and Central America
among others. This is a combined effect of weather, geomagnetic and tidal effects
associated with the full moon." (September 7, 2017)
NEIC reported maximum intensity IX in the region of Chiapas, Mexico. Intensity VII was reported from Tuxtla Gutierrez, Chiapas with V in La Tritaria, San Cristobal de las Casas, Mexico and VI in Solola, Guatemala. Lesser
shaking was felt within about 700 km at intensity V-VI as far as Mexico City, Belize, Guatemala,
Oaxaca, Chiapas, Puebla and other states of Mexico as far west of Jalisco. It was also reported felt
with intensity II-III as far as 2000 km from the epicenter at San Antonio and Austin,
Texas. Extreme damage probably occurred in the epicentral zone and internet
pictures confirmed this. A tsunami warning with possible waves up to 3 meters was issued by PTWC. While a tsunami
likely occurred, reports are unverified at this writing.
Internet photos showed extensive damage to buildings in eastern Mexico. At least
two people were confirmed dead at this writing. Power was out as far as Mexico
City and roofs were damaged throughout the area. In some areas roads were blocked
with debris and hotel guests were trapped.." (September 8, 2017)
Today's epicenters in Chiapas, Mexico are at 104-106 degrees from New Zealand and Honshu, Japan and at
the third node (120 degrees) from the South Geomagnetic Pole and may have
been promoted by energy from these sources.
In particular, at 106 degrees from the Epicenter yesterday in South Island,
New Zealand this summary had anticipated this activity in Chiapas in previous
issues as for example in the previous issue:
"Today's earthquake map on this website shows nodal areas where likely seismic enhancement may
occur following the event in New Zealand. The distance at 103 degrees
is notable as it passes through active areas of California, Mexico and Peru
among others. It is likely that enhanced seismicity in those areas will
continue following today's event in New Zealand." (July 17, 2026)
Enhanced seismicity in the area at this time had also been anticipated in this summary
in earlier issues due to the sub-solar nature of this epicenter at this time - for example:
"Other seismic regions nearing sub-solar conditions in the next several days
include Guerrero and central Mexico and northern Philippines among others.
Moderate seismic enhancement in these areas is possible at this time due
to sub-solar stresses." (July 11, 2026)
Today's mainshock occurred near local solar noon and within about 1 degree
of the sub-solar latitude for July 18. The nature of sub-solar triggering
in Chiapas, Mexico had been elaborated on in this summary on July 14, 2023
when an M 6.3 hear near today's epicenter near the time of the new moon.
At the time it was noted in this summary:
"The strongest earthquake in the world today was an M 6.3 south of Chiapas, Mexico. NEIC reported it was felt with maximum intensity VIII in Chiapas at Tonala; V in Tapachula; IV in Pijijiapan, IV in San Cristobal de las Casas and in Guatemala at Quetzaltenango and Olintepeque among others. Lesser shaking in Chiapas was reported from Tres Picos and Puerto Madero.
Previous strong earthquakes in this area have often occurred within a couple
of days of the new moon, with strong geomagnetic storms and flares, and are often
most likely to occur in mid-summer with the sun directly overhead near the new or full moon." (July 14, 2023)
Statistical evidence indicates that some triggering or promotion forward in time can occur in regions which are under high stress due to additional stress events of small size. Among these are surface and body waves passing through a region. Triggering may be dynamic with the promoted earthquake occurring at the same time as the stress event or delayed with an earthquake occurring later in time but still related to the stress event through water lubrication or other various geophysical effects on the faults. We have argued in this report for the past 35 years that this effect is most observable where the seismic waves are largest. In general this occurs at distances from the rupture ends of the earthquake producing those waves (mainshock) which we have termed nodal distances. These are defined by the formula D=360*m/n where D is the distance in degrees and m<=m where n an m are small integers. These are also the locations of the maximum corrections to magnitude in the standard Jeffreys-Bullen tables. In addition there is focusing of seismic energy from reflections and refractions of f the core-mantle and the inner-outer core boundary of the earth. This focuses energy at the surface in the distance between 101 and 108 degrees (core-mantle) and 141-148 degrees (inner-outer core boundary). In this report we monitor seismicity at these distances following major earthquakes as experience has shown that strong and/or unusual earthquake are much more likely to occur at these distance from the mainshock.
Antipodal (~180 degrees)
Eastern Mexico to
Outer shadow zone edge (141-148 degrees)
Eastern Mexico to Banda Sea, South of Africa, Andaman Is, Kerguelen Islands, Java, Sumba, Ceram, Flores, Myanmar, South of Australia,
Node 3 (120 degrees)
Eastern Mexico to Botswana, Tajikistan, Eastern New Guinea, Taiwan, Papua New Guinea, Congo, Bismarck Sea,
P- and S- shadow zone edge and node 7 (101-110 degrees)
Eastern Mexico to Sea of Japan, Guam, East of Honshu, Japan, Snares Island, N.Z, Northern Mariana Is. Caucasus, Bonin Islands, Guam, Honshu, Cook Strait, New Zealand, Auckland Is, Izu Is, Japan, Vanuatu, Honshu, Japan, Hokkaido, Western Turkey, southern New Zealand,
Node 4 (90 degrees)
Eastern Mexico to Poland, South of Fiji, Tonga, South Sandwich Islands, Italy, Kurils, Kermadec Islands,
Node 5 (72 degrees)
Eastern Mexico to Central Mid-Atlantic, Iceland, Rat Is, Andreanof Is, Chukotka, Russia,
Node 6 (60 degrees)
Eastern Mexico to South Pacific Ocean, northern Chile, Fox Islands, Alaska, Central Chile, Hawaii, Alaska, Reykjanes Ridge,
Node 7 (52 degrees)
Eastern Mexico to Antofagasta, western Canada, Central Chile, Coquimbo,
Node 8 (45 degrees)
Eastern Mexico to Vancouver,
The following chart shows the number of earthquakes that occurred today at one degree distance intervals from recent large earthquakes.
O: 17JUL2026 23:46:20 13.9N 93.3W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 08:54:00 13.9N 93.3W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 09:17:19 13.9N 93.3W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 17JUL2026 22:20:12 14.0N 93.4W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 17JUL2026 22:59:33 14.0N 93.5W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 04:09:52 14.0N 93.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 06:14:42 14.0N 93.3W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 07:55:10 14.0N 93.4W ML=4.6 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 17JUL2026 22:00:23 14.1N 93.3W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 17JUL2026 22:32:12 14.1N 93.4W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 17JUL2026 22:34:23 14.1N 93.4W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 17JUL2026 22:36:03 14.1N 93.3W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 17JUL2026 22:51:44 14.1N 93.0W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 23:12:40 14.1N 93.4W ML=4.4 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 17JUL2026 23:48:00 14.1N 93.0W mb=4.6 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 02:00:42 14.1N 93.0W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 03:22:19 14.1N 93.4W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 04:13:54 14.1N 93.5W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 08:29:53 14.1N 93.9W ML=3.8 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 08:59:33 14.1N 93.3W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 18JUL2026 09:51:33 14.1N 93.5W ML=4.2 EMSC OFFSHORE GUATEMALA
O: 17JUL2026 19:09:42 14.2N 93.0W mb=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 20:02:30 14.2N 93.0W mb=5.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 20:35:28 14.2N 93.2W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 17JUL2026 21:38:28 14.2N 93.0W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 22:13:07 14.2N 93.1W mb=5.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 23:35:10 14.2N 93.9W mb=4.6 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 02:29:36 14.2N 93.9W mb=4.5 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 04:40:32 14.2N 93.9W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 07:20:47 14.2N 93.0W mb=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 09:34:16 14.2N 93.4W ML=4.6 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 17JUL2026 15:14:59 14.3N 93.0W mb=5.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 15:30:38 14.3N 93.9W mb=5.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 16:42:27 14.3N 93.0W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 16:57:38 14.3N 93.2W mb=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 17:23:33 14.3N 93.7W mb=5.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 18:26:43 14.3N 93.0W mb=5.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 19:17:21 14.3N 93.3W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 21:11:43 14.3N 93.1W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 01:11:07 14.3N 93.0W mb=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 03:12:04 14.3N 93.8W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 07:27:16 14.3N 93.5W ML=4.3 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 17JUL2026 15:20:07 14.4N 93.0W mb=6.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 16:01:25 14.4N 93.7W mb=5.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 16:25:20 14.4N 93.1W mb=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 17:03:39 14.4N 93.1W mb=5.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 00:21:04 14.4N 93.2W mb=4.6 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 01:49:05 14.4N 93.2W Mw=5.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 05:26:28 14.4N 93.1W ML=4.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 06:51:50 14.4N 93.2W Mw=5.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 07:46:19 14.4N 93.9W mb=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 15:57:16 14.5N 93.0W mb=5.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 17:15:23 14.5N 93.9W mb=5.1 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 00:53:52 14.5N 93.3W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 13:20:34 14.6N 93.0W mb=4.7 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 14:48:41 14.7N 93.9W Mw=7.3 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 18:12:50 14.7N 93.7W mb=5.0 EMSC OFFSHORE CHIAPAS, MEXICO
O: 18JUL2026 04:28:53 14.7N 93.0W mb=4.9 EMSC OFFSHORE CHIAPAS, MEXICO
O: 17JUL2026 21:20:18 13.7N 92.6W ML=4.1 EMSC OFFSHORE GUATEMALA
O: 18JUL2026 06:10:35 13.9N 91.5W mb=4.6 EMSC OFFSHORE GUATEMALA
O: 18JUL2026 06:52:13 14.1N 91.3W mb=5.3 EMSC GUATEMALA
NEIC reported an earthquake of M 4.9 in the southern East Pacific Rise was not felt in this remote area.
This epicenter is at 45.0 degrees from Chiapas, Mexico (node 8) and near the
sixth node (60 degrees) from Venezuela and New Zealand and may have been
promoted by energy from those sources.
O: 18JUL2026 11:12:57 24.4S 116.1W MW=4.9 NEIC SOUTHERN EAST PACIFIC RISE
NEIC reported an earthquake of M 4.3 in Crete, Greece was felt with intensity up to II-III in the area(s) of Crete, Greece
EMSC reported moderate shaking in Crete, Greece at Agioi Theodoroi, Irakleion, Nea Alikarnassos, Ano Arhanes, Stalis, Rethymno, Kalyves, Chania, Daratsos.
This epicenter is at 103 degrees from Chiapas, Mexico and may have been
promoted by energy from that source.
O: 18JUL2026 09:04:09 35.7N 25.1E ML=4.3 EMSC CRETE, GREECE
NEIC reported an earthquake of M 3.6 in Nevada was felt with intensity up to II-III in the area(s) of Nevada in Amargosa Valley.
O: 18JUL2026 07:34:02 36.7N 116.3W ML=3.5 EMSC NEVADA
NEIC reported an earthquake of M 4.5 in the Central Mid-Atlantic Ridge was not felt with intensity up to II-III in the area(s) of the Central Mid-Atlantic Ridge.
This epicenter is at the fifth node (72 degrees) from Chiapas and may have
been promoted by energy from that source.
O: 18JUL2026 06:26:08 0.9S 21.5W MB=4.5 EMSC CENTRAL MID-ATLANTIC RIDGE
NEIC reported an earthquake of M 4.3-4.7 in Kodiak, Alaska was felt with intensity up to II-III in the area(s) of Kodiak, Alaskan the area of Akhiok.
This epicenter is at the sixth node (60 degrees) from Chiapas, Mexico and
105 degrees from New Zealand and may have been promoted by energy from those
sources.
O: 18JUL2026 07:20:42 56.1N 153.3W MB=4.7 EMSC KODIAK ISLAND REGION, ALASKA
NEIC reported earthquakes of M 5.2 and M 5.0 South of the Kermadec Islands were not felt in this remote area.
These epicenters are at the fourth node (90 degrees) from Chiapas, Mexico
and may have been promoted by energy from that source.
O: 18JUL2026 05:46:47 32.8S 178.1W MB=5.2 EMSC SOUTH OF KERMADEC ISLANDS
O: 17JUL2026 13:17:01 33.0S 177.9W mb=5.0 EMSC SOUTH OF KERMADEC ISLANDS
NEIC reported an earthquake of M 5.3 in the Celebes Sea was felt with intensity up to II-III in the area(s) of the Celebes Sea in southern Mindanao, Philipines at San Isidro and Koronadal and in Manado, Sulawesi, Indonesia.
O: 18JUL2026 02:23:40 4.6N 124.9E MW=5.3 EMSC CELEBES SEA
NEIC reported an earthquake of M 4.5 in Siberia, Russia was felt with intensity up to II-III in the area(s) of Siberia, Russia near Burla.
O: 17JUL2026 21:09:03 53.3N 78.1E MB=4.5 EMSC SOUTHWESTERN SIBERIA, RUSSIA
NEIC reported an earthquake of M 5.0 in Eastern Turkey was felt with intensity up to II-III in the area(s) of Turkey at Gaziantep.
EMSC reported moderate shaking in eastern Turkey at Malatya, Battalgazi, Yesilyurt, Dogansehir, Elazig, Elbistan, Karakopru, Kahramanmaras, Gaziantep, Sahinbey, Sivas, Karatas and in Halep, Aleppo, Syria.
This is the strongest earthquake within about 200 km of this epicenter in Turkey
since an M 5.4 on May 20, 2026. At the time this summary noted:
"A moderately strong M 5.4 earthquake also occurred today in Eastern Turkey. EMSC reported it was strongly felt in Turkey in Malatya, Battalgazi, Yazihan, Kahta, Adiyaman, Elazig, Siverek, Karakopru, Sanliurfa, Caglayancerit, and with moderate intensity at Bogurtlen, Pazarcik, Birecik, Nizip, Sehitkamil, Kahramanmaras, and as far as Hamah, Syria, Tripoli, Lebanon, Cyprus, among others.
NEIC reported this earthquake was felt with V in Turkey at Gaziantep with V and in Beirut, Lebanon with intensity II.
The last earthquake of M>=5.4 in eastern Turkey within about 200 km of this
epicenter was an M 6.0 on October 16, 2024." (May 20, 2026)
Today's epicenter is at 142 degrees from New Zealand and at 110 degrees from
Chiapas, Mexico and may have been promoted
by energy from those sources. A moderate M 4.0 occurred as a foreshock
at this epicenter yesterday and was reported in this summary at the time as:
"EMSC reported an earthquake of M 4.0 in Eastern Turkey was felt with intensity up to IV in the area(s) of Eastern Turkey in Kale, Elazig, and Suran, Syria.
This epicenter is at the longitude of maximum tidal stress with the new
moon of July 14 as noted in previous issues of this summary as:
"The new moon arrived on July 14, 2026 at 09:43 UT. Longitudes at local solar noon are near 39 East while those at local solar midnight are near 141 West longitude. These include Hawaii and areas of eastern Alaska and western Canada and to a lesser extent areas off the coast of Oregon and California while in the east they include Eastern Turkey as well as Ethiopia and areas off southern Africa. These and surrounding areas are the most likely to see tidally enhanced seismicity at this time. A moderate to large earthquake is possible in central or eastern Turkey at this time." (July 12-15, 2026)
O: 16JUL2026 19:52:53 38.4N 38.9E ML=4.0 EMSC EASTERN TURKEY
O: 18JUL2026 03:21:00 38.2N 38.5E MW=5.0 EMSC EASTERN TURKEY
EMSC reported an earthquake of M 3.9 in the Caucasus was felt with intensity up to IV in the area(s) of the Caucasus in Russia at Tereze and Uchkeken.
Like the event in eastern Turkey (see above) this event may have been
promoted by tidal stresses with the new moon.
EMSC reported an earthquake of M 4.5 in Snares Island, south of South Island, New Zealand was not felt in this remote area.
GeoNet reported the following data for this earthquake.
O: 16JUL2026 19:30:18 48.1S 165.2E ML=4.4 GEONET Not reported felt.
O: 17JUL2026 19:30:16 48.2S 165.3E MB=4.5 EMSC OFF W. COAST OF S. ISLAND, N.Z
EMSC reported an earthquake of M 3.5 in Poland was felt with intensity up to IV in the area(s) of Poland in Polkowice and Jerzmanowa and Glogow.
This epicenter is at the fourth node (90 degrees) from Chiapas and may have been
promoted by energy from that source.
O: 18JUL2026 11:27:42 51.5N 16.1E MB=3.5 EMSC POLAND
O: 18JUL2026 05:17:00 51.4N 16.1E MB=3.4 EMSC POLAND
EMSC reported an earthquake of M 2.3 in Santa Monica, California was felt with intensity up to IV in the area(s) of Santa Monica, California in Venice, Westwood, Culver City, and Marina del Rey.
O: 18JUL2026 07:35:02 34.0N 118.5W ML=2.3 EMSC SANTA MONICA BAY, CALIFORNIA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM ELIDA (05E)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS ELIDA 2026-07-18 00:00 UT 17.6N 122.5W 70 kts Pacific Southwest of Mexico
TS Elida (05E) continued today southwest of Baja California, Mexico in the north Pacific Ocean with winds up to 70 kts. It is expected to track to the northwest over the next several days with winds up to hurricane force but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Elida is near 18S 57E in the South Indian Ocean where enhanced seismicity is likely at this time.
A tropical cyclone may be forming south of Mexico. This storm is currently at 11N 105W south of Michoacan, Mexico with winds up to 33 kts. It is not expected to significantly enhance regional seismicity at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 16, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
7980 2055 2135 2200 C5.2 (July 16, 2026) 2.7E-03 *
Southern Mid-Atlantic Ridge M 5.0, 5.3, 4.7 ... 20:55-22:00 UT
Kyushu M 5.2 21:49 UT
7990 2315 0002 0039 C1.5 (July 16, 2026) 1.8E-03 *
Mongolia M 3.7 00:13 UT
South of Fiji M 4.4 23:35 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: unsettled July 18 quiet July 19-20. Solar M-flare chance: 15% X-class: 1% proton storm: 1%
A strong excursion in the geomagnetic field at the GOES 18 satellite magnetometer
occurred today starting at about 19:00 UT and peaking at 19:30 UT. An arcjet orbital maneuver
was performed and normal operations resumed by 20:20 UT. A regional aftershock of M 4.8 in the Snares Island area south of South Island, New Zealand
and about 200 km southwest of the strong M 6.3 in New Zealand was recorded
at 19:30 UT and may have been related to this change in geomagnetic field.
After several days offline the GOES-19 magnetometer resumed operations
at 15:30 UT on July 17. This, unfortunately was too late to catch any
geomagnetic fluctuations associated with today's M 7.3 in Chiapas, Mexico
which was near the longitude of this satellite and may have shown some
interesting results at this time. The mainshock in Chiapas, Mexico occurred
at 14:48 UT. The Kp and Hp30 index did not exceed 2 during the past 24 hours.
AP Indicies: global: 4, high: 3, mid-latitude: 4, time of max k: 15:00-18:00 UT; Max k: 2 Global Kp 1.33 1300-1900, July 17; Sunspot Number: 26; Radio Flux: 105
July 17, 2026
Notable earthquakes and events:
A strong earthquake of M 5.9 (EMSC) to M 6.3 (GeoNet) occurred in South Island, New Zealand today.
NEIC reported it was felt in South Island with intensity IV in Invercargill, Waitati, Otago, Alexandra, Bluff, Queenstown and III in Wanaka, Denedin, Timaru.
EMSC reported moderate shaking in South Island, New Zealand at Queenstown, Wanaka, Invercargill, Dunedin, Waitati.
This earthquake may have been triggered by the ScS seismic wave (an S-wave that reflects off the core-mantle boundary) which
originated 16 minutes earlier when an M 5.0 occurred off the east coast of
North Island, New Zealand. This wave returns to the surface at 11-12 degrees
distance from the epicenter after 16 minutes, the time between the two
earthquakes in New Zealand and may have helped trigger the larger event
in South Island. In a similar manner, the strongest aftershock recorded
by GeoNet occurred also at 16 minutes after the mainshock at the return
time of the ScS wave originating in New Zealand to the epicentral area. The M 5.9 is the strongest earthquake in South Island, New
Zealand within about 200 km of this epicenter since an M 7.8 and aftershocks
on July 15, 2009 exactly 17 years ago today. At the time this summary noted:
"A very strong earthquake of M 7.6 hit off the southwest coast of New Zealand today
in the Fiordland region of South Island. It was followed later in the day
by an M 6.1 in the region of New Ireland, P.N.G. There were no reports of
damage or casualties in New Ireland where the quake hit southwest of
the town of Kavieng according to AFP. The New Zealand earthquake was felt strongly
on South Island and caused minor damage but no major damage or casualties
according to initial reports. It was followed by at least 10 moderate to
strong aftershocks of M 5.2, 5.4, 5.2 and 5.8 which were generally fel with
intensity up to IV for the larger and IV-V for the more moderate events
in general at Invercargill and Gore, New Zealand. An M 5.4 aftershock off the
coast was reported felt with intensity VI at Te Anau. A foreshock
about 100 km to the northeast occurred on July 12 with M 4.0 in the Haast
area according to GeoNet and was reported on here. GeoNet initially reported
the earthquake as an M 6.6 but revised the moment magnitude to M 7.8 later.
That agency reported the earthquake was widely felt in the South Island and
as far north as Taranaki. An aftershock about 20 minutes after the mainshock
of M 5.8-6.1 was also felt on the southern South Island according to GeoNet.
NEIC reported maximum intensity VI at Tuatapere and Te Anau, Southland, N.Z. with intensity
V at Bluff, Edendale, Greymouth, Lumsden, and Winton, Southland, N.Z. Intensity
IV was reported generally within about 200 km but as far as 600 km from the epicenter at Wyndham, Westport, Wanaka,
Stirling, Riversdale, Queenstown, Outram, Invercargill, Balclutha and Arrowtown.
Lesser intensities were felt on North Island as far as Auckland 1200 km to the
north and in Sydney, Australia nearly 2000 km to the northwest. The M 5.8-6.1
aftershock was also reported felt with intensity VI at Tuatapere and IV at Queenstown,
Otago as well as within about 500 km of the epicenter. A tsunami alert was
issued but the maximum size of the tsunami thus far reported was about 20 cm.
At Jackson Bay and Bluff the tsunami arrived about 30 minutes after the quake and measured
about 17 cm. The tsunami was also observed across the Tasman Sea in Sydney. The
Australian Bureau of Meteorology reported a tsunami was felt along the coast
in New South Wales, Victoria, Tasmania, Lord Howe and Norfolk Island and
several waves and strong currents were detected mostly with heights of 20-30 cm.
Tsunamis in this area are generally not large and seldom are
damaging. Some power outages occurred with the quake. There were some reports
of downed power and phone lines in east Invercargill and Otatara and cracks in houses at Invercargil and Wanaka. Residents
in Queenstown ran into the streets in panic. The quake was described as
strong and rolling motion. It is quite possible that the quake added stress
to other faults along the Alpine Fault system bringing some closer to rupture.
A major break on the Alpine fault may be overdue and could come sooner rather
than later following today's earthquake. A strong earthquake hit the same region on August
22, 2003 with M 7.1. It caused significant landslides in part of South Island.
Similar earthquakes of M 7.0-7.1 hit the region on August 10, 1993 and November
22, 2004 but this is apparently the strongest earthquake in the region since
an M 8.0 in 1826, although the magnitude of that event is questionable.
This is the second largest earthquake to occur in the 500 year history of
New Zealand. The largest was an M 8.2 which hit in 1855 and killed eight
in the area of Wellington and Wairarapa. A similar M 7.8 hit in Hawke's Bay 78 years
ago and killed 256 people. The entire city of Napier was flattened. In 1929 an M 7.8
earthquake hit Buller killing 15 people.
While we had not expected a great earthquake in this area of New Zealand
at this time, with the geomagnetic storm we had anticipated a possible
strong event within about 10-40 km of the actual epicenter with magnitude
up to M 6.1 in forecast 46982. This event had been expected around July 14
as noted below.
The most active area of seismicity following the earthquake in New Zealand
occurred at the inner edge of the seismic shadow zone where seismic energy
is concentrated by reflection and refraction to the surface from the core-mantle
boundary. This is often seen to increase seismicity in the first few days
after major earthquakes in the distance range 100-108 degrees. In today's
events, several earthquakes were felt in this zone after the New Zealand earthquake.
These included an M 5.0 felt with intensity II at Jinjiang, Gansu, China,
an unusually large earthquake for this region. An earthquake of M 3.1 in
Central California was also felt with intensity II-III. Both of these
events occurred at 103-104 degrees from New Zealand. A series of
earthquakes also hit the Unimak Islands area of Alaska with M 5.0, 3.7, 3.0, and
3.5 at 102-104 degrees from New Zealand. An earthquake of M 4.6
was located at 103 degrees from New Zealand in Michoacan, Mexico according
to UNAM. The only nodal distance which showed immediate triggering was
at 45 degrees (n8) where the M 6.1 hit in New Ireland. The strong series
of earthquakes in Taiwan continued today with the strongest an M 5.4 felt
with intensity V in the Hualien area. These are occurring at 80 degrees (n9)
from New Zealand but are thought to have been triggered by tropical storms in the
region rather than the New Zealand earthquake. Further strong nodal
triggering is expected in the next several weeks and we will report on
it as it occurs. Readers are encouraged to examine the accompanying map
for other regions where nodal or shadow zone edge triggering may occur
in the coming weeks." (July 16, 2009)
GeoNet (the local seismic network) reported the following data for this earthquake.
This activity in New Zealand is at the third node (120 degrees) from Venezuela and may
have been promoted by energy from that source. Today's earthquake map
on this website shows nodal areas where likely seismic enhancement may
occur following th event in New Zealand. The distance at 103 degrees
is notable as it passes through active areas of California, Mexico and Peru
among others. It is likely that enhanced seismicity in those areas will
continue following today's event in New Zealand.
O: 16JUL2026 09:14:54 45.1S 167.6E MB=6.5 GEONET Felt with moderate intensity in the area south of Te Anau, South Island. 18532 reports of felt intensity came from the area east and north of the epicenter including 6514 with weak intensity; 9012 light; 2590 moderate; 374 strong; 22 severe and 20 extreme.
O: 16JUL2026 09:14:54 45.1S 167.6E ML=6.7 GEONET Felt with moderate intensity in the area south of Te Anau, South Island. 18532 reports of felt intensity came from the area east and north of the epicenter including 6514 with weak intensity; 9012 light; 2590 moderate; 374 strong; 22 severe and 20 extreme.
O: 16JUL2026 09:31:41 45.0S 167.6E ML=4.3 GEONET Felt with moderate intensity in the area south of Te Anau, South Island. 1815 reports of felt intensity came from the area east and north of the epicenter including 577 with weak intensity; 832 light; 353 moderate; 41 strong; 7 severe and 5 extreme.
O: 16JUL2026 09:31:41 45.0S 167.6E ML=4.3 IGNS SOUTH ISLAND, NEW ZEALAND
O: 16JUL2026 09:14:54 45.1S 167.6E MB=6.5 IGNS SOUTH ISLAND, NEW ZEALAND
O: 16JUL2026 09:14:54 45.1S 167.6E ML=6.7 IGNS SOUTH ISLAND, NEW ZEALAND
O: 16JUL2026 14:26:36 44.9S 167.5E ML=3.6 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 17JUL2026 02:26:41 44.9S 167.4E ML=4.4 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 09:14:54 45.0S 167.7E Mw=5.9 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 09:14:54 45.0S 167.7E Mw=6.3 IGNS SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 09:21:05 45.0S 167.6E ML=3.6 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 09:25:33 45.0S 167.6E ML=3.3 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 09:30:37 45.0S 167.5E ML=3.8 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 09:31:41 45.0S 167.6E ML=4.1 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 09:39:51 45.0S 167.6E ML=3.5 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 09:51:51 45.0S 167.6E ML=3.9 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 09:57:45 45.0S 167.6E ML=3.4 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 10:04:06 45.0S 167.5E ML=3.1 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 11:32:09 45.0S 167.5E ML=3.5 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 13:25:00 45.0S 167.6E ML=3.2 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 16:16:35 45.0S 167.5E ML=3.3 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 16:50:16 45.0S 167.5E ML=3.8 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 17JUL2026 00:32:07 45.0S 167.5E ML=3.2 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 17JUL2026 03:45:26 45.0S 167.4E ML=3.2 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 17JUL2026 04:05:34 45.0S 167.5E ML=3.8 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 09:28:31 45.1S 167.7E ML=3.4 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 09:46:33 45.1S 167.6E ML=3.2 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 11:17:33 45.1S 167.5E ML=3.1 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 16JUL2026 09:14:54 45.0S 167.7E MD=5.9 EMSC SOUTH ISLAND, NEW ZEALAND
O: 16JUL2026 08:58:02 37.3S 179.9E MD=5.0 EMSC OFF E. COAST OF NORTH ISLAND, NEW ZEALAND
O: 16JUL2026 08:58:02 37.4S 179.9E MB=5.0 EMSC OFF E. COAST OF N. ISLAND, N.Z
The strongest earthquake in the U.S. or Canada today was an M 5.2 in southeastern Alaska.
NEIC reported it was felt with intensity III in Alaska at Copper Center and II in Valdez.
This is the strongest earthquake in Southeastern Alaska within about 200 km
of this epicenter since an M 5.3 and M 5.7 on January 1, 2026 which - like today's event -
occurred with the solar-lunar tidal alignment (full moon) as did the mainshock
on December 6, 2026 which arrived late on December 4, 2025. These, in turn,
were aftershocks of the M 7.0 that hit the area about 100 km east of today's
epicenter on December 6, 2025. At the time of the January, 2026 event this
summary noted:
"The full moon arrived on January 3, 2026 at 10:03 UT. Longitudes which are at ... local solar midnight are near 154 West longitude. In the west these include Hawaii and areas of eastern and southern Alaska ...
The strongest earthquake in the U.S. or Canada today was an M 5.7 followed by an M 5.3 in southeastern Alaska.
NEIC reported it with felt with intensity III in Whitehorse and IV in Haines Junction, Yukon Territory, Canada and in Alaska with III in Yakjutat, Haines, Copper Center and lightly in Elfin Cove.
This is the strongest aftershock to date of the M 7.0 of December 6, 2025
in the Yukon Territory, Canada although a similar event of M 5.7-5.8 occurred on December 8, 2025. A series of increasingly large aftershocks has occurred in this area over the
past several days as reported in the previous issue of this summary:
"The strongest earthquake in the U.S. or Canada today was an M 5.1 in southeastern Alaska
along the border with Yukon Territory, Canada. NEIC reported this event
was felt with intensity III in Yukon, Canada at Whitehorse and Haines Junction with II.
It follows a slow increase in regional seismicity over the past two days
as reported in the previous issue of this summary:
"The strongest earthquakes in the U.S. or Canada today were a series about 200 km outside the
aftershock zone southeast of the M 7.0 in the Yukon, Canada event of December 6, 2025.
These events of M 3.5 and 3.6 follow an M 4.6 in the region yesterday. That event
is the strongest aftershock of the December 6 mainshock since an M 4.7 on December
10, 2025. Recent increases in solar activity may indicate activation of the
area with the possibility of a further event of M>=5 in the next couple of
days. Today's earthquakes were probably felt with intensity up to III in the Elfin Cove area of
Alaska as per NEIC data.
These epicenters are at the seventh node (52 degrees) from Hokkaido
and may have been promoted by energy from that source." (December 29-30, 2025, January 1, 2026)
This earthquake occurred near local solar midnight and may have been promoted
by tidal stresses with the new moon of July 14 which maximized at the longitude
of this earthquake as noted in previous issues of this summary:
"The new moon arrived on July 14, 2026 at 09:43 UT. Longitudes at local solar noon are near 39 East while those at local solar midnight are near 141 West longitude. These include Hawaii and areas of eastern Alaska and western Canada and to a lesser extent areas off the coast of Oregon and California while in the east they include Eastern Turkey as well as Ethiopia and areas off southern Africa. These and surrounding areas are the most likely to see tidally enhanced seismicity at this time. A moderate to large earthquake is possible in central or eastern Turkey at this time." (July 12-15, 2026)
This epicenter is located at the fifth node (72 degrees) from Venezuela and
may have been promoted by energy from that source.
O: 16JUL2026 11:37:21 60.5N 141.5W MD=5.2 NEIC SOUTHEASTERN ALASKA
NEIC reported an earthquake of M 5.5 in the Volcano Islands, Japan was felt in the epicentral area.
This is the strongest earthquake in the Volcano Islands, Japan since an M 6.0
on March 2, 2026.
A week ago Super Typhoon Bavi passed just south of this epicenter at
its maximum intensity. This was reported in this summary at the time as:
"Super Typhoon Bavi (TD 09W) continued today north of Guam with winds up to 175 kts. It is expected to track to the northwest over the next week passing over Guam as a major typhoon with winds up to 180 kts on or about July 4-5, 2026. Major damage is possible in Guam at that time. Seismicity in Guam is sensitive to strong Typhoons. It is likely that a moderate to large earthquake near Guam will accompany the landfall of Bavi in Guam within several days...." (july 6, 2026)
It is likely that lingering stresses from ST Bavi helped promote today's
earthquake.
This epicenter in the Volcano Islands is at the fifth node (72 degrees)
from the M 6.3+ quake in New Zealand today.
O: 16JUL2026 07:49:09 22.8N 144.4E MD=5.5 NEIC VOLCANO ISLANDS, JAPAN
O: 16JUL2026 07:49:09 22.9N 144.4E MW=5.5 EMSC VOLCANO ISLANDS, JAPAN REGION
NEIC reported an earthquake of M 3.0 in Northern California was felt with intensity up to II-III in the area(s) of Northern California with III in Watsonville, Gilroy and II in Santa Cruz, San Francisco, Marina, San Jose, Morgan Hill, Aptos, San Juan Bautista and Santa Cruz.
O: 17JUL2026 07:52:08 36.9N 121.7W MD=3.0 EMSC NORTHERN CALIFORNIA
A series of moderate earthquakes occurred today in the Southern Mid-Atlantic
Ridge. These events were not reported felt in this remote epicentral area.
They were closely associated with solar flare 7980 (C5.2), the strongest
flare of the day and may have been promoted by energy from that event.
Preliminary data for this flare from SWPC follow.
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
7980 2055 2135 2200 C5.2 (July 16, 2026) 2.7E-03 *
Southern Mid-Atlantic Ridge M 5.0, 5.3, 4.7 ... 20:55-22:00 UT
Kyushu M 5.2 21:49 UT
The last earthquake within about 200 km of today's events in the southern
mid-Atlantic with M>=5.3 occurred on January 28, 2026 with M 5.4 but the last
such event within about 150 km was an M 5.5 on June 21, 2023. At the time
this summary noted:
"A series of moderate earthquakes hit the Atlantic ridge area today. This included
an M 5.5 and M 4.6 foreshock in the Southern Mid-Atlantic Ridge; an M 4.6 about
400 km southeast of this about four minutes before them; an M 4.8 in the Central
Mid-Atlantic and an M 4.5 in the northern Mid-Atlantic ridge area. None of these
were reported felt in these remote oceanic areas. The M 5.5 in the Southern
Mid-Atlantic is the largest recorded within about 250 km of this epicenter
since an M 5.5 about 250 km northeast of this on March 17, 2022 but no earthquakes
of greater magnitude have occurred within about 100 km of today's epicenter
in at least 35 years." (June 21, 2023)
These earthquakes are occurring near the third node (120 degrees) from the M 6.3+
earthquake in New Zealand. They are also near 103 degrees from the north and south geomagnetic poles
and at the sixth node (60 degrees) from Venezuela.
O: 16JUL2026 19:51:50 12.2S 14.3W MB=4.9 EMSC SOUTHERN MID-ATLANTIC RIDGE
O: 16JUL2026 23:29:40 12.4S 14.9W mb=4.8 EMSC SOUTHERN MID-ATLANTIC RIDGE
O: 16JUL2026 19:24:18 12.6S 14.8W mb=4.8 EMSC SOUTHERN MID-ATLANTIC RIDGE
O: 16JUL2026 21:16:33 12.6S 14.9W mb=5.0 EMSC SOUTHERN MID-ATLANTIC RIDGE
O: 16JUL2026 21:53:58 12.6S 15.0W mb=5.0 EMSC SOUTHERN MID-ATLANTIC RIDGE
O: 16JUL2026 19:44:55 12.7S 14.3W mb=5.0 EMSC SOUTHERN MID-ATLANTIC RIDGE
O: 16JUL2026 19:55:31 12.7S 14.3W mb=5.0 EMSC SOUTHERN MID-ATLANTIC RIDGE
O: 16JUL2026 20:03:01 12.7S 14.8W mb=4.9 EMSC SOUTHERN MID-ATLANTIC RIDGE
O: 16JUL2026 20:21:52 12.7S 14.8W mb=5.3 EMSC SOUTHERN MID-ATLANTIC RIDGE
O: 16JUL2026 20:55:24 12.7S 14.7W mb=4.9 EMSC SOUTHERN MID-ATLANTIC RIDGE
O: 16JUL2026 21:29:41 12.8S 14.8W mb=4.7 EMSC SOUTHERN MID-ATLANTIC RIDGE
O: 17JUL2026 02:31:15 12.8S 14.7W mb=4.8 EMSC SOUTHERN MID-ATLANTIC RIDGE
O: 16JUL2026 21:50:39 12.9S 13.6W mb=4.8 EMSC SOUTHERN MID-ATLANTIC RIDGE
NEIC reported an earthquake of M 4.5 in the Owen Fracture Zone was not felt.
This epicenter is at 120 degrees from Venezuela and may have been promoted by
energy from that source. More enhanced seismicity in this area of the
Owen Fracture zone is likely in the next several days.
O: 17JUL2026 02:04:03 13.7N 58.4E MB=4.5 EMSC OWEN FRACTURE ZONE REGION
NEIC reported earthquakes of M 5.2 and M 4.1 in Myanmar may have been felt with intensity up to II-III in the area(s) of Myanmar near Shwebo.
EMSC reported moderate shaking in Myanmar at Shwebo, Mandalay, and Pyin Oo Lwin.
These epicenters are at 143 degrees from Venezuela and may have been promoted by
energy from that source.
O: 17JUL2026 01:26:07 22.9N 95.9E MB=5.2 EMSC MYANMAR
O: 17JUL2026 01:42:21 22.5N 96.2E ML=4.1 EMSC MYANMAR
NEIC reported an earthquake of M 4.8 in Qinghai, China may have been felt with intensity up to II-III in the area(s) of China at Dunhuang.
This epicenter is located at 104 degrees from the M 6.3+ in New Zealand.
O: 17JUL2026 01:08:12 37.8N 95.4E MB=4.8 EMSC NORTHERN QINGHAI, CHINA
NEIC reported an earthquake of M 5.2 in Kyushu, Japan was felt with intensity up to II-III in the area(s) of Kyushu, Japan
O: 16JUL2026 21:49:40 30.8N 131.4E MB=5.2 EMSC KYUSHU, JAPAN
NEIC reported an earthquake of M 3.3 in Yellowstone National Park, Wyoming was felt with intensity up to II-III in the area(s) of Yellowstone National Park, Wyoming.
O: 16JUL2026 13:20:12 44.7N 110.5W ML=3.3 NEIC YELLOWSTONE NAT. PARK, WYOMING
O: 16JUL2026 13:20:12 44.7N 110.5W ML=3.2 EMSC YELLOWSTONE NAT. PARK, WYOMING
EMSC reported an earthquake of M 4.0 in Eastern Turkey was felt with intensity up to IV in the area(s) of Eastern Turkey in Kale, Elazig, and Suran, Syria.
This epicenter is at the longitude of maximum tidal stress with the new
moon of July 14 as noted in previous issues of this summary as:
"The new moon arrived on July 14, 2026 at 09:43 UT. Longitudes at local solar noon are near 39 East while those at local solar midnight are near 141 West longitude. These include Hawaii and areas of eastern Alaska and western Canada and to a lesser extent areas off the coast of Oregon and California while in the east they include Eastern Turkey as well as Ethiopia and areas off southern Africa. These and surrounding areas are the most likely to see tidally enhanced seismicity at this time. A moderate to large earthquake is possible in central or eastern Turkey at this time." (July 12-15, 2026)
O: 16JUL2026 19:52:53 38.4N 38.9E ML=4.0 EMSC EASTERN TURKEY
EMSC reported an earthquake of M 3.9 in the Caucasus was felt with intensity up to IV in the area(s) of the Caucasus in Russia at Tereze and Uchkeken.
Like the event in eastern Turkey (see above) this event may have been
promoted by tidal stresses with the new moon.
O: 16JUL2026 21:24:57 43.9N 42.4E ML=3.9 EMSC CAUCASUS REGION, RUSSIA
EMSC reported an earthquake of M 4.8 in Coquimbo, Chile was felt with intensity up to IV in the area(s) of Coquimbo, Chile in Coquimbo, La Serena and Vicuna.
O: 16JUL2026 10:38:08 30.2S 71.4W MB=4.8 EMSC OFFSHORE COQUIMBO, CHILE
EMSC reported an earthquake of M 4.6 in Costa Rica was felt with intensity up to IV in the area(s) of Costa Rica in Mague, Panama.
O: 16JUL2026 10:33:52 9.5N 83.7W MB=4.6 EMSC COSTA RICA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM ELIDA (05E)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS ELIDA 2026-07-17 00:00 UT 15.9N 119.8W 70 kts Pacific SouthWest of Mexico
TS Elida (05E) continued today southwest of Baja California, Mexico in the north Pacific Ocean with winds up to 70 kts. It is expected to track to the northwest over the next several days with winds up to hurricane force but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Elida is near 16S 60E in the South Indian Ocean where enhanced seismicity is likely at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 16, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
7980 2055 2135 2200 C5.2 (July 16, 2026) 2.7E-03 *
Southern Mid-Atlantic Ridge M 5.0, 5.3, 4.7 ... 20:55-22:00 UT
Kyushu M 5.2 21:49 UT
7990 2315 0002 0039 C1.5 (July 16, 2026) 1.8E-03 *
Mongolia M 3.7 00:13 UT
South of Fiji M 4.4 23:35 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: unsettled July 18 quiet July 17 and July 19. Solar M-flare chance: 25% X-class: 1% proton storm: 1%
A moderate geomagnetic storm with Hp30 (Kp) reaching 4.0 occurred early on
UT July 16 between 03:30 and 05:30 on July 16, 2026.
AP Indicies: global: 13, high: 20, mid-latitude: 11, time of max k: 15:00-18:00 UT; Max k: 4 Global Kp 3.00 0300-0600, July 16; Sunspot Number: 47; Radio Flux: 101
July 16, 2026
Notable earthquakes and events:
A strong earthquake of M 5.9 (EMSC) to M 6.3 (GeoNet) occurred in South Island, New Zealand today.
NEIC reported it was felt in South Island with intensity IV in Invercargill, Waitati, Otago, Alexandra, Bluff, Queenstown and III in Wanaka, Denedin, Timaru.
EMSC reported moderate shaking in South Island, New Zealand at Queenstown, Wanaka, Invercargill, Dunedin, Waitati.
This earthquake may have been triggered by the ScS seismic wave (an S-wave that reflects off the core-mantle boundary) which
originated 16 minutes earlier when an M 5.0 occurred off the east coast of
North Island, New Zealand. This wave returns to the surface at 11-12 degrees
distance from the epicenter after 16 minutes, the time between the two
earthquakes in New Zealand and may have helped trigger the larger event
in South Island. In a similar manner, the strongest aftershock recorded
by GeoNet occurred also at 16 minutes after the mainshock at the return
time of the ScS wave originating in New Zealand to the epicentral area. The M 5.9 is the strongest earthquake in South Island, New
Zealand within about 200 km of this epicenter since an M 7.8 and aftershocks
on July 15, 2009 exactly 17 years ago today. At the time this summary noted:
"A very strong earthquake of M 7.6 hit off the southwest coast of New Zealand today
in the Fiordland region of South Island. It was followed later in the day
by an M 6.1 in the region of New Ireland, P.N.G. There were no reports of
damage or casualties in New Ireland where the quake hit southwest of
the town of Kavieng according to AFP. The New Zealand earthquake was felt strongly
on South Island and caused minor damage but no major damage or casualties
according to initial reports. It was followed by at least 10 moderate to
strong aftershocks of M 5.2, 5.4, 5.2 and 5.8 which were generally fel with
intensity up to IV for the larger and IV-V for the more moderate events
in general at Invercargill and Gore, New Zealand. An M 5.4 aftershock off the
coast was reported felt with intensity VI at Te Anau. A foreshock
about 100 km to the northeast occurred on July 12 with M 4.0 in the Haast
area according to GeoNet and was reported on here. GeoNet initially reported
the earthquake as an M 6.6 but revised the moment magnitude to M 7.8 later.
That agency reported the earthquake was widely felt in the South Island and
as far north as Taranaki. An aftershock about 20 minutes after the mainshock
of M 5.8-6.1 was also felt on the southern South Island according to GeoNet.
NEIC reported maximum intensity VI at Tuatapere and Te Anau, Southland, N.Z. with intensity
V at Bluff, Edendale, Greymouth, Lumsden, and Winton, Southland, N.Z. Intensity
IV was reported generally within about 200 km but as far as 600 km from the epicenter at Wyndham, Westport, Wanaka,
Stirling, Riversdale, Queenstown, Outram, Invercargill, Balclutha and Arrowtown.
Lesser intensities were felt on North Island as far as Auckland 1200 km to the
north and in Sydney, Australia nearly 2000 km to the northwest. The M 5.8-6.1
aftershock was also reported felt with intensity VI at Tuatapere and IV at Queenstown,
Otago as well as within about 500 km of the epicenter. A tsunami alert was
issued but the maximum size of the tsunami thus far reported was about 20 cm.
At Jackson Bay and Bluff the tsunami arrived about 30 minutes after the quake and measured
about 17 cm. The tsunami was also observed across the Tasman Sea in Sydney. The
Australian Bureau of Meteorology reported a tsunami was felt along the coast
in New South Wales, Victoria, Tasmania, Lord Howe and Norfolk Island and
several waves and strong currents were detected mostly with heights of 20-30 cm.
Tsunamis in this area are generally not large and seldom are
damaging. Some power outages occurred with the quake. There were some reports
of downed power and phone lines in east Invercargill and Otatara and cracks in houses at Invercargil and Wanaka. Residents
in Queenstown ran into the streets in panic. The quake was described as
strong and rolling motion. It is quite possible that the quake added stress
to other faults along the Alpine Fault system bringing some closer to rupture.
A major break on the Alpine fault may be overdue and could come sooner rather
than later following today's earthquake. A strong earthquake hit the same region on August
22, 2003 with M 7.1. It caused significant landslides in part of South Island.
Similar earthquakes of M 7.0-7.1 hit the region on August 10, 1993 and November
22, 2004 but this is apparently the strongest earthquake in the region since
an M 8.0 in 1826, although the magnitude of that event is questionable.
This is the second largest earthquake to occur in the 500 year history of
New Zealand. The largest was an M 8.2 which hit in 1855 and killed eight
in the area of Wellington and Wairarapa. A similar M 7.8 hit in Hawke's Bay 78 years
ago and killed 256 people. The entire city of Napier was flattened. In 1929 an M 7.8
earthquake hit Buller killing 15 people.
While we had not expected a great earthquake in this area of New Zealand
at this time, with the geomagnetic storm we had anticipated a possible
strong event within about 10-40 km of the actual epicenter with magnitude
up to M 6.1 in forecast 46982. This event had been expected around July 14
as noted below.
The most active area of seismicity following the earthquake in New Zealand
occurred at the inner edge of the seismic shadow zone where seismic energy
is concentrated by reflection and refraction to the surface from the core-mantle
boundary. This is often seen to increase seismicity in the first few days
after major earthquakes in the distance range 100-108 degrees. In today's
events, several earthquakes were felt in this zone after the New Zealand earthquake.
These included an M 5.0 felt with intensity II at Jinjiang, Gansu, China,
an unusually large earthquake for this region. An earthquake of M 3.1 in
Central California was also felt with intensity II-III. Both of these
events occurred at 103-104 degrees from New Zealand. A series of
earthquakes also hit the Unimak Islands area of Alaska with M 5.0, 3.7, 3.0, and
3.5 at 102-104 degrees from New Zealand. An earthquake of M 4.6
was located at 103 degrees from New Zealand in Michoacan, Mexico according
to UNAM. The only nodal distance which showed immediate triggering was
at 45 degrees (n8) where the M 6.1 hit in New Ireland. The strong series
of earthquakes in Taiwan continued today with the strongest an M 5.4 felt
with intensity V in the Hualien area. These are occurring at 80 degrees (n9)
from New Zealand but are thought to have been triggered by tropical storms in the
region rather than the New Zealand earthquake. Further strong nodal
triggering is expected in the next several weeks and we will report on
it as it occurs. Readers are encouraged to examine the accompanying map
for other regions where nodal or shadow zone edge triggering may occur
in the coming weeks." (July 16, 2009)
GeoNet (the local seismic network) reported the following data for this earthquake.
O: 16JUL2026 09:14:54 45.1S 167.6E MB=6.5 GEONET Felt with moderate intensity in the area south of Te Anau, South Island. 18532 reports of felt intensity came from the area east and north of the epicenter including 6514 with weak intensity; 9012 light; 2590 moderate; 374 strong; 22 severe and 20 extreme.
O: 16JUL2026 09:14:54 45.1S 167.6E ML=6.7 GEONET Felt with moderate intensity in the area south of Te Anau, South Island. 18532 reports of felt intensity came from the area east and north of the epicenter including 6514 with weak intensity; 9012 light; 2590 moderate; 374 strong; 22 severe and 20 extreme.
O: 16JUL2026 09:31:41 45.0S 167.6E ML=4.3 GEONET Felt with moderate intensity in the area south of Te Anau, South Island. 1815 reports of felt intensity came from the area east and north of the epicenter including 577 with weak intensity; 832 light; 353 moderate; 41 strong; 7 severe and 5 extreme.
O: 16JUL2026 09:31:41 45.0S 167.6E ML=4.3 IGNS SOUTH ISLAND, NEW ZEALAND
O: 16JUL2026 09:14:54 45.1S 167.6E MB=6.5 IGNS SOUTH ISLAND, NEW ZEALAND
O: 16JUL2026 09:14:54 45.1S 167.6E ML=6.7 IGNS SOUTH ISLAND, NEW ZEALAND
O: 16JUL2026 09:14:54 45.0S 167.7E MD=5.9 EMSC SOUTH ISLAND, NEW ZEALAND
O: 16JUL2026 08:58:02 37.3S 179.9E MD=5.0 EMSC OFF E. COAST OF NORTH ISLAND, NEW ZEALAND
O: 16JUL2026 09:14:54 45.0S 167.7E MD=5.9 EMSC SOUTH ISLAND, NEW ZEALAND
The strongest earthquake in the U.S. or Canada today was an M 5.2 in southeastern Alaska.
NEIC reported it was felt with intensity III in Alaska at Copper Center and II in Valdez.
This is the strongest earthquake in Southeastern Alaska within about 200 km
of this epicenter since an M 5.3 and M 5.7 on January 1, 2026 which - like today's event -
occurred with the solar-lunar tidal alignment (full moon) as did the mainshock
on December 6, 2026 which arrived late on December 4, 2025. These, in turn,
were aftershocks of the M 7.0 that hit the area about 100 km east of today's
epicenter on December 6, 2025. At the time of the January, 2026 event this
summary noted:
"The full moon arrived on January 3, 2026 at 10:03 UT. Longitudes which are at ... local solar midnight are near 154 West longitude. In the west these include Hawaii and areas of eastern and southern Alaska ...
The strongest earthquake in the U.S. or Canada today was an M 5.7 followed by an M 5.3 in southeastern Alaska.
NEIC reported it with felt with intensity III in Whitehorse and IV in Haines Junction, Yukon Territory, Canada and in Alaska with III in Yakjutat, Haines, Copper Center and lightly in Elfin Cove.
This is the strongest aftershock to date of the M 7.0 of December 6, 2025
in the Yukon Territory, Canada although a similar event of M 5.7-5.8 occurred on December 8, 2025. A series of increasingly large aftershocks has occurred in this area over the
past several days as reported in the previous issue of this summary:
"The strongest earthquake in the U.S. or Canada today was an M 5.1 in southeastern Alaska
along the border with Yukon Territory, Canada. NEIC reported this event
was felt with intensity III in Yukon, Canada at Whitehorse and Haines Junction with II.
It follows a slow increase in regional seismicity over the past two days
as reported in the previous issue of this summary:
"The strongest earthquakes in the U.S. or Canada today were a series about 200 km outside the
aftershock zone southeast of the M 7.0 in the Yukon, Canada event of December 6, 2025.
These events of M 3.5 and 3.6 follow an M 4.6 in the region yesterday. That event
is the strongest aftershock of the December 6 mainshock since an M 4.7 on December
10, 2025. Recent increases in solar activity may indicate activation of the
area with the possibility of a further event of M>=5 in the next couple of
days. Today's earthquakes were probably felt with intensity up to III in the Elfin Cove area of
Alaska as per NEIC data.
These epicenters are at the seventh node (52 degrees) from Hokkaido
and may have been promoted by energy from that source." (December 29-30, 2025, January 1, 2026)
This earthquake occurred near local solar midnight and may have been promoted
by tidal stresses with the new moon of July 14 which maximized at the longitude
of this earthquake as noted in previous issues of this summary:
"The new moon arrived on July 14, 2026 at 09:43 UT. Longitudes at local solar noon are near 39 East while those at local solar midnight are near 141 West longitude. These include Hawaii and areas of eastern Alaska and western Canada and to a lesser extent areas off the coast of Oregon and California while in the east they include Eastern Turkey as well as Ethiopia and areas off southern Africa. These and surrounding areas are the most likely to see tidally enhanced seismicity at this time. A moderate to large earthquake is possible in central or eastern Turkey at this time." (July 12-15, 2026)
O: 16JUL2026 11:37:21 60.5N 141.5W MD=5.2 NEIC SOUTHEASTERN ALASKA
NEIC also reported an earthquake of M 4.9 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaska in Kalskag, Bethel, Manokotak, Aleknagik and Lower Kalskag.
This is an unusual earthquake. The last event within about 200 km of this
epicenter with M>=4.9 occurred more than 35 years ago. Most of the reported earthquakes
in the general area of today's epicenter occur about 350 km southeast of
today's epicenter with the last an M 5.1 on April 1, 2025 and an M 5.7 on July 23, 2016.
O: 16JUL2026 02:07:38 60.1N 159.6W MD=4.9 NEIC SOUTHERN ALASKA
NEIC also reported an earthquake of M 4.7 South of Alaska may have been felt with intensity up to II-III in the epicentral area.
O: 15JUL2026 17:46:19 54.2N 153.3W MD=4.7 NEIC SOUTH OF ALASKA
NEIC reported an earthquake of M 5.5 in the Volcano Islands, Japan was felt in the epicentral area.
This is the strongest earthquake in the Volcano Islands, Japan since an M 6.0
on March 2, 2026.
A week ago Super Typhoon Bavi passed just south of this epicenter at
its maximum intensity. This was reported in this summary at the time as:
"Super Typhoon Bavi (TD 09W) continued today north of Guam with winds up to 175 kts. It is expected to track to the northwest over the next week passing over Guam as a major typhoon with winds up to 180 kts on or about July 4-5, 2026. Major damage is possible in Guam at that time. Seismicity in Guam is sensitive to strong Typhoons. It is likely that a moderate to large earthquake near Guam will accompany the landfall of Bavi in Guam within several days...." (july 6, 2026)
It is likely that lingering stresses from ST Bavi helped promote today's
earthquake.
O: 16JUL2026 07:49:09 22.8N 144.4E MD=5.5 NEIC VOLCANO ISLANDS, JAPAN
NEIC reported an earthquake of M 4.7 in Tokyo. Japan was felt with intensity up to II-III in the area(s) of Tokyo. Japan in Tokyo and Kashiwa, Chiba.
O: 16JUL2026 00:01:08 35.7N 140.5E MD=4.7 NEIC TOKYO, JAPAN
NEIC reported an earthquake of M 5.8 south of Fiji may have been felt.
The last earthquake of M>=5.8 within about 200 km of this epicenter in
Fiji was an M 6.5 on April 13, 2025. At the time this summary noted:
"The largest earthquake in the world today was an M 6.5 at an intermediate focal depth under the area south of the Fiji Islands. NEIC reported it may have been felt with intensity up to III but no specific reports were available.
No Tsunami was expected nor observed. This is the strongest earthquake within
about 200 km of this epicenter since an M 7.0 on February 18, 2009 and priot to that a major
earthquake of M 7.7 on December 9, 2007." (April 13, 2025)
Today's earthquake occurred within minutes of local solar noon at the
end of the strongest solar flare of the day and may have been promoted
by SFE associated with that flare (C8.9 #7900). Preliminary data on this flare from SWPC follow.
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
7900 2046 2155 2300 C8.9 (July 15, 2026) 3.6E-02 *
Samar, Philippines M 4.0 20:51 UT
Tabasco, Mexico M 4.1 21:10 UT
Mariana Is. M 4.3 21:40 UT
Fiji M 4.5 21:58 UT
South of Fiji M 5.8 22:57 UT
O: 15JUL2026 22:57:11 26.3S 178.7W MD=5.8 NEIC SOUTH OF FIJI ISLANDS
NEIC reported an earthquake of M 4.3 in Colombia was felt with intensity up to II-III in the area(s) of Colombia in Bogota.
O: 15JUL2026 20:13:38 6.6N 73.1W MD=4.3 NEIC COLOMBIA
NEIC reported an earthquake of M 3.5 in Central Alaska was felt with intensity up to II-III in the area(s) of Central Alaska in Denali National Park.
O: 15JUL2026 19:31:38 63.6N 150.7W MD=3.5 NEIC CENTRAL ALASKA
NEIC reported an earthquake of M 5.7 east of the South Sandwich Islands was not felt in this remote area.
This earthquake occurred near local solar noon and may have been tidally
promoted by the new moon of July 14.
O: 15JUL2026 14:51:37 60.0S 19.0W MD=5.7 NEIC EAST OF SOUTH SANDWICH ISLANDS
NEIC reported an earthquake of M 2.7 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in Healdsburg, Cloverdale, Geyserville and the Sea Ranch.
O: 15JUL2026 14:58:32 38.8N 122.9W MD=2.7 NEIC NORTHERN CALIFORNIA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM ELIDA (05E)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS ELIDA 2026-07-16 00:00 UT 15.6N 116.5W 60 kts Pacific SouthWest of Mexico
TS Elida (05E) continued today southwest of Baja California, Mexico in the north Pacific Ocean with winds up to 60 kts. It is expected to track to the northwest over the next several days with winds up to hurricane force but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Elida is near 16S 65E in the South Indian Ocean where enhanced seismicity is likely at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 15, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
7840 0815 0846 0915 C3.3 (July 15, 2026) 2.7E-03 *
Antofagasta M 3.8 08:31 UT
Honshu M 3.9 08:39 UT
Southern California M 2.9 08:48 UT
Alaska Peninsula M 3.7 08:59 UT
7830 0238 0312 0405 C1.2 (July 15, 2026) 5.1E-03
Central Peru M 4.5 02:40 UT
Kamchatka M 5.1 02:42 UT M 4.7 03:36 UT
7880 1803 1814 1824 C1.5 (July 15, 2026) 1.3E-03
Guatemala M 4.3 18:23 UT
7900 2046 2155 2300 C8.9 (July 15, 2026) 3.6E-02 *
Samar, Philippines M 4.0 20:51 UT
Tabasco, Mexico M 4.1 21:10 UT
Mariana Is. M 4.3 21:40 UT
Fiji M 4.5 21:58 UT
South of Fiji M 5.8 22:57 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: unsettled July 16-17 quiet July 18. Solar M-flare chance: 10% X-class: 1% proton storm: 1%
A moderate geomagnetic storm with Hp30 (Kp) reaching 4.0 occurred early on
UT July 16 between 03:30 and 05:30 on July 16, 2026.
AP Indicies: global: 13, high: 20, mid-latitude: 11, time of max k: 11:00-15:00 UT; Max k: 5 Global Kp 3.67 0300-0600, July 15; Sunspot Number: 25; Radio Flux: 100
July 15, 2026
Notable earthquakes and events:
Two moderate earthquakes occurred on the Alaska Peninsula today. These events of
M 5.3 and M 5.4 were reported by NEIC to have been felt sith intensity up to
V in Alaska at King Cove and II in Sand Point and False Pass. The first of
these of M 5.3 which was felt in King Cove with IV and III in False Pass and Akutan occurred at the beginning of the strongest solar flare of
the day and may have been promoted by SFE from that flare as it occurred
near local solar midnight. SWPC reported the following data for this flare:
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
7730 1210 1239 1300 C3.9 (July 14, 2026) 6.4E-03 *
Alaska Peninsula M 5.3 12:12 UT
O: 14JUL2026 18:51:07 54.2N 162.6W MD=5.4 NEIC ALASKA PENINSULA
O: 14JUL2026 12:12:19 54.1N 162.5W MD=5.3 NEIC ALASKA PENINSULA
The strongest earthquake in the world today was an M 6.2 aftershock in Mindanao.
NEIC reported it was felt with intensity V in Southern Mindanao in Polomolok, Maasim, Kiamba, Malapatan, Malandag, Lun, Tinoto, Buayan, Katangawan, San Jose, Silway, Bato; IV in Padada, Koronadal Digos, Tacurong Davao and III in Zamboanga, Ula and Carpenter Hill and in Indonesia Sulawesi in Manado.
This event occurred within minutes of local solar midnight and was probably
promtoted by tidal stresses with today's new moon which maximize near this hour.
The last and only aftershock of M>=6.2 of the M 7.8 of June 7, 2026 (excluding
an M 6.5 on June 8) occurred on June 26, 2026 with M 6.5. At the time this summary
noted:
"Aftershocks in Mindanao Philippiines also continued today. The strongest of these
occurred as an M 6.5, the strongest aftershock of the M 7.8 of June 7, 2026 since
an M 6.5 on June 8, 2026. NEIC reported today's earthquake was felt with intensity VI in southern Mindanao at San Jose, Kiamba, Klinan; V in Maitum, Conel, Maan, Katangawan, Silway, Buayan, Banga, IV in Padada, Pag-asa. Koronadal, Barra, Davao, and III in Manado, Sulawesi, Indonesia among others.
This event lies on the geomagnetic equator at a position which was exactly
at local solar noon when a strong geomagnetic excursion was recorded on
GOES satellites. This was reported in the previous issue of this summary as:
"A strong excursion in the the strength of the geomagnetic field measured by the GOES-19
magnetometer increasing the measured strength of the field from about 70 nT
at 03:42 UT to 120 nT at 03:48 UT on June 26, 2026. This continued until about
05:09 UT when a sudden drop in the recorded magnetic field occurred. The position
of the satellite was corrected with an arcjet maneuver at about 03:45 UT and
normal recording resumed about 05:20 UT. The GOES-18 magnetometer showed
a similar increase in the magnetic field peaking at about 03:45 UT." (June 26, 2026)
NEIC reported an earthquake of M 4.6 in Mindanao was felt with intensity up to II-III in the area(s) of
This earthquake may have been promoted by a strong geomagnetic change
at the time of the event as recorded on GOES Satellite magnetometers (see above)." (June 26, 2026).
O: 14JUL2026 15:49:41 5.3N 125.2E MD=6.2 NEIC MINDANAO, PHILIPPINES
O: 14JUL2026 113:15:08 5.7N 125.4E MD=5.1 NEIC MINDANAO, PHILIPPINES
The second strongest earthquake in the world today was an M 5.5 in the area of Fiji.
NEIC reported it was probably too deep at 574 km to have been felt on the surface.
This event occurred within minutes of local solar noon and may have been
promoted by tidal and/or geomagnetic stresses which maximize near this hour.
O: 14JUL2026 22:50:12 20.7S 178.5W MD=5.5 NEIC FIJI REGION
NEIC reported an earthquake of M 2.7 in Central California was felt with intensity up to II-III in the area(s) of Central California near Coso Junction.
O: 15JUL2026 04:46:40 36.0N 117.9W MD=2.7 NEIC CENTRAL CALIFORNIA
NEIC reported an earthquake of M 5.1 in Valparaiso, Chile was felt with intensity up to II-III in the area(s) of Valparaiso, Chile with IV in Quilpue; III in La Ligua, Vina del Mar and Santiago and II in Lampa, Limache and Calera.
O: 15JUL2026 01:09:20 32.6N 71.9W MD=5.1 NEIC VALPARAISO, CHILE
NEIC reported an earthquake of M 4.0 in Dominican Republic was felt with intensity up to II-III in the area(s) of Dominican Republic with III in Las Terrenas and El Carril, San Cristobal and II in Santiago and Santo Domingo.
EMSC reported moderate to strong shaking in the Dominican Republic at Las Terrenas, Samana, Santo Domingo, Guerra, La Agustina, Otra Banda, Enxanche Luperon, Villa Consuela, Santiago de los Caballeros, Ciudad Nueva, La Julia, Bella Vista, Bajos de JHaina, Punta Cana.
The event occurred near local solar noon and may have been promoted by
tidal and/or geomagnetic stresses.
O: 14JUL2026 15:20:14 19.6N 69.3W MD=4.0 NEIC DOMINICAN REPUBLIC
NEIC reported an earthquake of M 3.8 in Fox Islands, Alaska was felt with intensity up to II-III in the area(s) of Fox Islands, Alaska at Akutan.
O: 14JUL2026 14:56:44 53.5N 166.5W MD=3.8 NEIC FOX ISLANDS, ALEUTIANS
NEIC reported an earthquake of M 2.5 in Southern California was felt with intensity up to II-III in the area(s) of Southern California in Frazier Park.
It is an aftershock of the M 4.1 at that epicenter of July 12, 2026.
O: 14JUL2026 13:50:12 34.8N 118.9W MD=2.5 NEIC SOUTHERN CALIFORNIA
NEIC reported an earthquake of M 2.7 in Central California was felt with intensity up to II-III in the area(s) of Central California at Gilroy and Santa Cruz.
O: 14JUL2026 11:11:56 37.0N 121.4W MD=2.7 NEIC CENTRAL CALIFORNIA
NEIC reported an earthquake of M 5.6 in Central Peru was felt with intensity up to II-III in the area(s) of Central Peru near Sicuani, Cusco.
O: 14JUL2026 08:21:06 14.6S 71.4W MD=5.6 NEIC CENTRAL PERU
NEIC reported an earthquake of M 4.9 in Northern Honshu, Japan was felt with intensity up to II-III in the area(s) of Northern Honshu, Japan near Morioka, Iwate and Misawa, Aomori.
O: 14JUL2026 08:07:30 40.1N 142.4E MD=4.9 NEIC NORTHERN HONSHU, JAPAN
NEIC reported an earthquake of M 4.6 in Vietnam was felt with intensity up to II-III in the area(s) of Vietnam near Kon Tum.
This epicenter is near where Typhoon Bavi has dissipated over the past several
days and may have been promoted by energy from that storm.
O: 14JUL2026 06:48:05 14.7N 108.2E MD=4.6 NEIC VIETNAM
NEIC reported an earthquake of M 4.8 in the mid-Indian ocean ridge was not felt in this remote area.
This epicenter is antipodal to the current position of Tropical Storm
Elida south of Baja California, Mexico and may have been promoted by
antipodal energy from that storm. This summary give the following
data for TS Elida as:
"TS ELIDA 2026-07-15 00:00 UT 14.8N 111.1W 45 kts Pacific SouthWest of Mexico
TS Elida (05E) formed today southwest of Baja California, Mexico in the north Pacific Ocean with winds up to 45 kts. It is expected to track to the northwest over the next several days with winds up to 45 kts but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Elida is near 14S 68E in the South Indian Ocean where enhanced seismicity is likely at this time." (July 15, 2026)
O: 14JUL2026 06:15:06 14.9S 47.0E MD=4.8 NEIC MID-INDIAN RIDGE
EMSC reported a series of earthquakes including an M 5.1 in Kamchatka, Russia was felt with intensity up to IV in the area(s) of Kamchatka, Russia in Petropavlovsk-
Kamchatsky. These began near local solar noon and may have been promoted
by tidal stresses with the new moon of July 14.
O: 15JUL2026 02:42:18 51.5N 159.3E MD=5.1 EMSC KAMCHATKA
EMSC reported an earthquake of M 4.2 in Central Turkey was felt with intensity up to IV in the area(s) of Central Turkey in Sahinbey, Sehitkamil, Gaziantep, Bahce, Dortyol and in I'zaz, Nubl, Al Bab, Manbij, Aleppo, Syria.
This epicenter is near the longitude of maximum tidal stress with today's
new moon and may have been promoted by tidal stresses with that alignment.
This had been considered in previous issues of this summary as:
"The new moon arrived on July 14, 2026 at 09:43 UT. Longitudes at local solar noon are near 39 East while those at local solar midnight are near 141 West longitude. These include Hawaii and areas of eastern Alaska and western Canada and to a lesser extent areas off the coast of Oregon and California while in the east they include Eastern Turkey as well as Ethiopia and areas off southern Africa. These and surrounding areas are the most likely to see tidally enhanced seismicity at this time. A moderate to large earthquake is possible in central or eastern Turkey at this time." (July 12-15, 2026)
O: 14JUL2026 18:27:10 37.3N 37.1E MD=4.2 EMSC CENTRAL TURKEY
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM ELIDA (05E)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS ELIDA 2026-07-15 00:00 UT 14.8N 111.1W 45 kts Pacific SouthWest of Mexico
TS Elida (05E) formed today southwest of Baja California, Mexico in the north Pacific Ocean with winds up to 45 kts. It is expected to track to the northwest over the next several days with winds up to 45 kts but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Elida is near 14S 68E in the South Indian Ocean where enhanced seismicity is likely at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 13, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0815 0846 0915 C3.3 (July 15, 2026) 2.7E-03
Antofagasta M 3.8 08:31 UT
Honshu M 3.9 08:39 UT
Southern California M 2.9 08:48 UT
Alaska Peninsula M 3.7 08:59 UT
7710 0949 0956 0959 C1.5 (July 14, 2026) 5.0E-04
Sumba M 4.3 09:52 UT
Luzon M 3.4 09:56 UT
Baja California M 3.2 10:02 UT
7730 1210 1239 1300 C3.9 (July 14, 2026) 6.4E-03
Alaska Peninsula M 5.3 12:12 UT
Central California M 2.0 12:53 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active July 15 unsettled July 16-17. Solar M-flare chance: 10% X-class: 1% proton storm: 1%
A moderate geomagnetic storm with Hp30 (Kp) reaching 4.0 occurred late on
UT July 13 between 23:30 and 00:00 on July 14, 2026.
AP Indicies: global: 7, high: 9, mid-latitude: 10, time of max k: 09:00-12:00 UT; Max k: 4 Global Kp 2.33 2100-2400, July 14; Sunspot Number: 36; Radio Flux: 100
July 14, 2026
Notable earthquakes and events:
The new moon will arrive on July 14, 2026 at 09:43 UT. Longitudes at local solar noon are near 39 East while those at local solar midnight are near 141 West longitude. These include Hawaii and areas of eastern Alaska and western Canada and to a lesser extent areas off the coast of Oregon and California while in the east they include Eastern Turkey as well as Ethiopia and areas off southern Africa. These and surrounding areas are the most likely to see tidally enhanced seismicity at this time. A moderate to large earthquake is possible in central or eastern Turkey at this time.
An M 4.3 earthquake occurred today on the eastern boundary of the Garlock
Fault in Central California. NEIC reported it was felt widely throughout the
area of southern and central California with intensity IV in California at Johannesburg and III in West Hollywood, Glendale, Solvang, Bakersfield, Los Angeles, Valencia, Palmdale, California City, Newhall, Santa Clarita, Mojave, Sunland, Lake Arrowhead, Springville, San Bernardino, Visalia, Tehachapi, Glendale, Los Angeles among others.
EMSC reported moderate shaking in California at Mojave, Edwards AFB, Inyokern, Rosamond, Tehachapi, Quartz Hill, Desert View Highlands, Palmdale, Adelanto, Acton, Santa Clarita, San Fernando, North Hills, Burbank, Pine Mountain Club, Glendale, North Hills, Northridge, among others.
The last earthquake of M>=4.3 within about 100 km of today's epicenter
occurred as an M 4.3 on April 18, 2024 about 75 km west of today's epicenter.
The last event of significatly larger magnitude closer than this was an M 4.6
four years ago on July 15, 2022. At the time this summary noted:
"The strongest earthquake in the U.S. or Canada today was an M 4.6 in the Ridgecrest area of Central California. NEIC reported this earthquake of M 4.6 in the California-Nevada border region was felt with intensity II-III in the area(s) of the California-Nevada border region with IV in Ridgecrest and Trona and lesser shaking in Inyokern, Weldon, Lake Isabella, Bodfish, Caliente, East Tulare County, Mojave and Wofford Heights.
This is the strongest earthquake within about 100 km of this epicenter since
an M 4.8 on August 19, 2020 - an aftershock of an M 5.8 on June 24, 2020.
A series of moderate to strong earthquake began in this area of Ridgecrest
in July 4 and 6, 2019 with M 6.4 and M 7.1 among many other moderate associated
shocks. Today's event was likely triggered by high tidal stresses with the
full moon of July 13 " (July 15, 2022)
An earthquake of M 4.1 occurred yesterday at the western edge of the Garlock
Fault and was reported in this summary as:
"A moderate earthquake followed the M 5.5 in the Southern East Pacific Rise
as an M 4.1 north of Los Angeles, California - also at 118.9 West longitude,
similar to the event in the East Pacific Rise. NEIC reported it was felt in Southern
California with III in Lebec and II in Bakersfield, Frazier Park, Fullerton, Maricopa, Canyon Country and Lancaster.
widely with intensity IV in Maricopa, Frazier Park, Lebec, Rosamond and III in Marina del Rey, Bodfish, Arvin, Agoura Hills, Los Angeles, Tujunga, West Hils, Los Angeles, Canoga Park, Thousand Oaks, Bakersfield, Lake Hughes, Newbury Park, Santa Clarita, Malibu, Pasadena, Porterville, Lancaster, Shafter among others in southern and Central California.
An aftershock of M 2.9 occurred later in the day near local solar noon. NEIC reported it was felt
This earthquake in California occurred at the intersection of the Garlock and San Andreas Faults and is
the first such event near this intersection near Frazier Park, California since an M 4.1 on March 12, 2106
and an M 4.2 on January 4, 2015. This is an area where some geophysicists think
a strong earthquake is likely in the short term. The last earthquake of significantly
larger magnitude within about 50 km of today's epicenter was an M 4.7 on September 22, 2005 - an aftershock of
the strongest regional event in the past 35 years - an M 5.1 on April 16, 2005.
Both the Garlock and the San Andreas faults are capable of earthquakes with
M>=7.5. An M 7.5 occurred in July 21, 1952 near Bakersfield, the largest
regional event in recent history but two major earthquakes hit the region
in 1812 with the activity in the New Madrid and Venezuela areas reported
in previous issues of this summary. While the length of the Garlock fault has been active in recent years,
the span of the the San Andreas to the north and south of the Garloc/San
Andreas has not shown much activity and may be locked. In that sense,
today's event may be a significant regional event indicating a change
in seismic pattern with increasing stress in this area. At the time of the M 4.1 on March 12, 2016" (July 13, 2026)
Together, these events at the easternmost and westernmost termina of the
Garlock fault suggest the area is under stress and may delineate a possible
rupture zone of a larger event forthcoming in the area.
Like the M 4.1 to the west of this, this epicenter is at the fifth node
(51.4 degrees) from the Venezuela earthquakes. The Garlock fault is nearly
perpendicular to wave trains from that source and could be strongly
affected by energy from that area because of that geometry.
O: 13JUL2026 16:40:55 35.3N 117.8W MB=4.3 NEIC CENTRAL CALIFORNIA
O: 13JUL2026 16:40:54 35.3N 117.8W MW=4.2 EMSC SOUTHERN CALIFORNIA
O: 13JUL2026 17:01:11 35.3N 117.8W ML=2.4 EMSC SOUTHERN CALIFORNIA
O: 13JUL2026 18:29:13 35.3N 117.8W ML=2.6 EMSC SOUTHERN CALIFORNIA
O: 13JUL2026 18:54:19 35.3N 117.8W ML=2.5 EMSC SOUTHERN CALIFORNIA
O: 13JUL2026 19:11:16 35.3N 117.8W ML=2.0 EMSC SOUTHERN CALIFORNIA
O: 13JUL2026 22:49:16 35.3N 117.8W ML=2.2 EMSC SOUTHERN CALIFORNIA
O: 14JUL2026 05:44:51 35.3N 117.8W ML=2.6 EMSC SOUTHERN CALIFORNIA
An M 6.3 occurred today in the area southeast of the Loyalty Islands. It was
not reported felt in this remote area. This continues strong seismicity
in the area which has been ongoing for several days. The last earthquake
in the Loyalty Islands within about 200 km of today's epicenter with M>=6.3
occurred as an M 7.1 on May 20, 2023 - an aftershock of an M 7.7 on May 19, 2023.
At the time this summary noted:
"A major to great earthquake occurred today in the region of New Caledonia and the Loyalty Islands.
NEIC reported this earthquake was felt with intensity II-III in New Caledonia at We Iles, Noumea, Paita, Norfold Island, Suva, Fiji and Sydney, New South Wasles, Australia.
This earthquake occurred at the peak of an M2.3 solar flare but was probably
triggered by an M8.0 flare which maximized within a couple of minutes of local
solar noon at the epicenter an hour earlier. Solar Flare Effects (SFE) on seismicity is most
prominent at local solar noon when the epicenter is directly beneath the sun. The
...
Today's activity in the Loyalty Islands was likely promoted by strong tidal stresses
associated with the new moon as noted in this summary ... " (May 19, 2023)
Like the events of May 19 and 20, 2023 today's activity in the Loyalty Islands
also coincided with the new moon of July 14, 2026 (see above) and may have
been promoted by tidal stresses with that alignment.
This epicenter is at the third node (120 degrees) from Venezuela and may
have been promoted by energy from that source.
O: 13JUL2026 14:45:49 22.8S 171.5E MB=6.3 NEIC SOUTHEAST OF LOYALTY ISLANDS
O: 13JUL2026 07:59:35 22.8S 171.6E MB=4.9 NEIC SOUTHEAST OF LOYALTY ISLANDS
O: 13JUL2026 06:45:31 22.7S 171.6E MB=5.0 EMSC SOUTHEAST OF LOYALTY ISLANDS
O: 13JUL2026 07:59:36 22.7S 171.5E mb=4.9 EMSC SOUTHEAST OF LOYALTY ISLANDS
O: 13JUL2026 14:45:52 22.7S 171.5E Mw=6.3 EMSC SOUTHEAST OF LOYALTY ISLANDS
O: 14JUL2026 01:27:40 22.7S 171.3E mb=4.9 EMSC SOUTHEAST OF LOYALTY ISLANDS
O: 13JUL2026 16:31:35 22.8S 171.5E mb=5.1 EMSC SOUTHEAST OF LOYALTY ISLANDS
O: 13JUL2026 17:15:34 22.8S 171.5E mb=4.5 EMSC SOUTHEAST OF LOYALTY ISLANDS
O: 13JUL2026 17:21:05 22.8S 171.5E mb=4.7 EMSC SOUTHEAST OF LOYALTY ISLANDS
O: 13JUL2026 17:24:11 22.8S 171.6E mb=4.5 EMSC SOUTHEAST OF LOYALTY ISLANDS
O: 13JUL2026 15:14:40 22.9S 171.5E mb=4.7 EMSC SOUTHEAST OF LOYALTY ISLANDS
O: 13JUL2026 21:03:42 23.0S 171.4E Mw=5.0 EMSC SOUTHEAST OF LOYALTY ISLANDS
O: 13JUL2026 19:48:32 23.1S 171.5E mb=4.8 EMSC SOUTHEAST OF LOYALTY ISLANDS
The strongest earthquake in the world today was an M 6.4 in Papua New Guinea.
NEIC reported it may have been felt lightly near Lorengau, Papua New Guinea.
The last earthquake in New Guinea within about 200 km of today's
epicenter which had M>=6.4 was an M 6.4 on July 25, 2016. At the time
this summary noted:
"The strongest earthquake of the day was an M 6.4 in the Admiralty Islands
near New Ireland. This is the strongest earthquake in the earth in at least
three weeks. The last event within about 250 km of this epicenter of M>=6.4
occurred more than 10 years ago on November 5, 2005 also with M 6.4. No earthquakes
of larger size have occurred in this region in at least 25 years, however events
of M 6.4 occurred on July 25, 2003 and on March 4, 1992. ... The Admiralty
Islands are located within about 10 degrees of the geomagnetic equator." (July 25, 2016)
This earthquake may have been promoted by effects from a moderate geomagnetic
storm as discussed in the previous issue of this summary:
"A moderate geomagnetic storm with Kp reaching 4.67 between 13:00 and 15:00 UT
occurred on July 12. At high latitudes Kp at this time was 7. This is the first
time kp at any latitude has reached 7 in the past month, although a similar reading
on Planetary K-index was obtained at about 03:00 UT on July 4. Longitudes which
may see triggered enhanced seismicity due to this storm include the South
Sandwich Islands which were near local solar noon and areas near New Guinea
which were near local solar midnight at the time of this storm commencement.
The new moon (see above) will tend to reinforce triggering in these areas
in the next several days and a moderately strong to strong earthquake is
considered likely near these regions in the next two days." (July 13, 2026)
The epicenter in New Guinea is at 143 degrees from Venezuela and was
likely promoted by energy from that source.
O: 13JUL2026 08:53:27 3.2S 148.5E MB=6.4 NEIC PAPUA NEW GUINEA
O: 13JUL2026 08:53:26 3.2S 148.5E MB=6.4 EMSC BISMARCK SEA
The earthquake in the Bismarck Sea (see above) was followed 3.3 minutes later
by an M 3.8 in the area south of Java, Indonesia and later by an M 4.0. This region has been
active at magnitude range lower than this since the M 7.5 hit in Venezuela
but these are the strongest event near the exact antipode in Java to date.
Stronger regional seismicity is possible due to antipodal effects from Venezuela.
O: 13JUL2026 08:56:43 10.6S 112.7E MB=3.8 EMSC SOUTH OF JAVA, INDONESIA
O: 13JUL2026 15:19:16 10.6S 113.6E ML=4.0 EMSC SOUTH OF JAVA, INDONESIA
O: 13JUL2026 08:56:43 10.7S 112.7E ML=3.8 EMSC SOUTH OF JAVA, INDONESIA
NEIC reported an earthquake of M 5.0 in Chiapas, Mexico was felt with intensity up to II-III in the area(s) of Chiapas, Mexico in Guatemal City at Chinautla, Retalhuleu, Villa Nueva and in San JKuan la Laguna, and Panajachel, Solola, Olintepeque, Quezaltenango and in Villahermosa, Tabasco, Mexico.
EMSC reported strong shaking in Guatemala at San Bernardino, San Antonio Aguas Calientes, Villa Nueva, Mixco, and in Tapachula, Mexico.
O: 14JUL2026 01:19:59 14.8N 92.3W MB=5.0 NEIC CHIAPAS, MEXICO
O: 14JUL2026 01:20:00 14.7N 92.3W MW=5.0 EMSC CHIAPAS, MEXICO
O: 14JUL2026 02:12:56 14.5N 92.4W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
NEIC reported an earthquake of M 2.8 off the coast of Northern California was felt with intensity up to II-III in the area(s) of off the coast of Northern California in Eureka.
O: 13JUL2026 18:44:28 40.5N 124.5W MB=2.8 NEIC OFFSHORE NORTHERN CALIFORNIA
NEIC reported an earthquake of M 3.0 in Nevada was felt with intensity up to II-III in the area(s) of Nevada in Silver Springs and Fallon.
O: 13JUL2026 09:46:03 39.3N 119.0W MB=3.0 NEIC NEVADA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
No Tropical cyclones are currently active
A tropical cyclone may be forming south of Guerrero, Mexico. This system is currently
at 12N 101W and moving to the west with winds up to 33 kts. No immediate
effects on regional seismicity are expected with this storm at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 13, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
7640 1733 1747 1800 C1.4 (July 13, 2026) 2.0E-03
Mindanao M 5.0 17:44 UT
South Sandwich Is. M 4.9 17:45 UT
Sea of Japan M 4.0 17:58 UT
7650 1815 1822 1833 C1.3 (July 13, 2026) 1.4E-03
Southern California M 2.6 18:29 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active July 14 unsettled July 15-16. Solar M-flare chance: 25% X-class: 5% proton storm: 1%
A moderate geomagnetic storm with Hp30 (Kp) reaching 4.0 occurred late on
UT July 13 between 23:30 and 00:00 on July 14, 2026.
AP Indicies: global: 9, high: 10, mid-latitude: 8, time of max k: 22:00-24:00 UT; Max k: 3 Global Kp 3.67 2100-2400, July 13; Sunspot Number: 59; Radio Flux: 103
July 13, 2026
Notable earthquakes and events:
The new moon will arrive on July 14, 2026 at 09:43 UT. Longitudes at local solar noon are near 39 East while those at local solar midnight are near 141 West longitude. These include Hawaii and areas of eastern Alaska and western Canada and to a lesser extent areas off the coast of Oregon and California while in the east they include Eastern Turkey as well as Ethiopia and areas off southern Africa. These and surrounding areas are the most likely to see tidally enhanced seismicity at this time. A moderate to large earthquake is possible in central or eastern Turkey at this time.
A moderate geomagnetic storm with Kp reaching 4.67 between 13:00 and 15:00 UT
occurred on July 12. At high latitudes Kp at this time was 7. This is the first
time kp at any latitude has reached 7 in the past month, although a similar reading
on Planetary K-index was obtained at about 03:00 UT on July 4. Longitudes which
may see triggered enhanced seismicity due to this storm include the South
Sandwich Islands which were near local solar noon and areas near New Guinea
which were near local solar midnight at the time of this storm commencement.
The new moon (see above) will tend to reinforce triggering in these areas
in the next several days and a moderately strong to strong earthquake is
considered likely near these regions in the next two days.
The first M-class solar flare in the past five days occurred today with
M1.1 peaking about 08:00 UT. Areas which were near local solar midnight
at the time of this flare were near 120 West longitude and included
Western California, Oregon and the Southeast Pacific Ridge. These
areas showed immediate SFE effects from this flare including an M 5.5 in
the Southeast Pacific and an M 4.1 north of Los Angeles, California and
an M 3.8 off the coast of Oregon.
The event in the Southern East Pacific Rise was discussed in the previous
issur of this summary as:
"The strongest earthquake in the world yesterday (July 11) was an M 6.4 in the South Sandwich
Islands of the southern Atlantic region. It was not reported felt in this
remote area. A tsunami was neither expected nor observed with this earthquake. The last earthquake of M>=6.4 in the South Sandwich Islands was
an M 7.1 on August 22, 2021 (see previous issue of this summary).
The second strongest earthquake in the world today occurred directly west
of the M 6.4 in the South Sandwich Island (see above) in the Southern East
Pacific Rise where an M 5.5 was recorded. At M 5.5 this is the strongest
earthquake in the Southern East Pacific Rise within about 200 km of this
epicenter in at least 35 years. The strongest earthquake within about 300
km of today's earthquake in the past 35 years was an M 6.6 on May 20, 2026
about 300 km east of today's epicenter. Today's event may have been promoted
by stress redistribution in the area from that quake which was discussed
at the time in this summary as:
"A strong M 6.6 earthquake hit the South East Pacific Rise today at 122 West
longitude. This event was not reported felt in this remote area and
a tsunami is unlikely. EMSC shows an aftershock of M 5.2 about 53 minutes
after the mainshock. The mainshock is the strongest recorded within
about 300 km of this epicenter since an M 6.6 on August 6, 2001 nearly
25 years ago.
This epicenter is at 122 West longitude, a longitude which was particularly stressed
during the new moon of May 16 as reported in previous issues of this summary:
"The new moon will arrive on May 16, 2026 at 20:01 UT. Longitudes which are at local solar noon at this time are near 120W and those at local solar midnight near 60E. In the west these include western North America (including California, Oregon and Washington) and portions of the East Pacific Rise and in the east portions of the central Indian Ocean and Central Asia near Hindu Kush, Iran, Pakistan and Afghanistan among others. These areas are most likely to see tidal triggering in the next week. A large earthquake is possible in this time and tidal triggering is not limited to these regions but is most likely near local solar noon or local solar midnight." (May 14-28, 2026)
This epicenter is also nearly antipodal to a highly unusual pair of earthquakes
that struck on May 5 in the Ural Mountains of Russia. ..." (May 20, 2026)
Today's event in the Southern East Pacific Rise occurred within minutes of
local solar midnight and may have been promoted by tidal and/or geomagnetic
stresses which maximize near this hour.
This earthquake appears to have been promoted by SFE from an M-class solar
flare. The quake occurred within minutes of local solar midnight near the
peak of an M1.1 solar flare (#7440), the first M-class solar flare since July 9 (M1.1 #6940).
Only two other M-class flares have been listed by SWPC in the past 10 days.
Preliminary data on this flare from SWPC follow.
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
7440 0717 0811 0842 M1.1 (July 12, 2026) 3.3E-02
Southern East Pacific Rise M 5.5 07:29 UT
Southern California M 4.1 10:38 UT
Central California M 2.4 08:02 UT
Fiji M 4.1 08:45 UT
Siberia M 4.4 08:03 UT
Kamchatka M 4.3 08:52 UT
A strong excursion in the geomagnetic field intensity at GOES satellites
was also recorded by both GOES 18 and 19 magnetometers. This began about 06:45 UT
to about 07:15 UT." (July 12, 2026)
This epicenter is at 144 degrees from the North Geomagnetic pole and may
have been promoted by energy from that source.
O: 12JUL2026 07:29:24 54.5S 118.9W MB=5.5 NEIC SOUTHERN EAST PACIFIC RISE
O: 12JUL2026 07:29:23 54.6S 119.0W MB=5.5 EMSC SOUTHERN EAST PACIFIC RISE
A moderate earthquake followed the M 5.5 in the Southern East Pacific Rise
as an M 4.1 north of Los Angeles, California - also at 118.9 West longitude,
similar to the event in the East Pacific Rise. NEIC reported it was felt in Southern
California with III in Lebec and II in Bakersfield, Frazier Park, Fullerton, Maricopa, Canyon Country and Lancaster.
widely with intensity IV in Maricopa, Frazier Park, Lebec, Rosamond and III in Marina del Rey, Bodfish, Arvin, Agoura Hills, Los Angeles, Tujunga, West Hils, Los Angeles, Canoga Park, Thousand Oaks, Bakersfield, Lake Hughes, Newbury Park, Santa Clarita, Malibu, Pasadena, Porterville, Lancaster, Shafter among others in southern and Central California.
An aftershock of M 2.9 occurred later in the day near local solar noon. NEIC reported it was felt
This earthquake in California occurred at the intersection of the Garlock and San Andreas Faults and is
the first such event near this intersection near Frazier Park, California since an M 4.1 on March 12, 2106
and an M 4.2 on January 4, 2015. This is an area where some geophysicists think
a strong earthquake is likely in the short term. The last earthquake of significantly
larger magnitude within about 50 km of today's epicenter was an M 4.7 on September 22, 2005 - an aftershock of
the strongest regional event in the past 35 years - an M 5.1 on April 16, 2005.
Both the Garlock and the San Andreas faults are capable of earthquakes with
M>=7.5. An M 7.5 occurred in July 21, 1952 near Bakersfield, the largest
regional event in recent history but two major earthquakes hit the region
in 1812 with the activity in the New Madrid and Venezuela areas reported
in previous issues of this summary. While the length of the Garlock fault has been active in recent years,
the span of the the San Andreas to the north and south of the Garloc/San
Andreas has not shown much activity and may be locked. In that sense,
today's event may be a significant regional event indicating a change
in seismic pattern with increasing stress in this area. At the time of the M 4.1 on March 12, 2016 this summary noted:
"The strongest earthquake in California today was an M 4.1 near Ojai, California.
NEIC reported maximum intensity V and noted it was felt with intensity II-III
in Santa Paula, Ojai, Fillmore, Oak View, Somis, Ventura, Moorpark, Camarillo
and other areas of Southwestern California. This was part of a series of events
which may have been tidally promoted. The initial events in the series - an M 3.3
and an M 2.3 occurred within about 30 minutes of local solar midnight, a prime
time for tidal triggering of seismicity. The event of M 4.1 is the strongest
to hit within about 50 km of this epicenter since an M 4.1 on May 8, 2009. The
last of larger magnitude in the region was an M 4.3 on July 24, 2004." (March 12, 2016)
This epicenter is at the seventh node (51.4 degrees) from recent major
earthquakes in Venezuela and was probably promoted by energy from those sources.
It is also at the fourth node (90 degrees) from the M 5.5 in the South East Pacific
Rise several hours earlier (see above).
O: 12JUL2026 10:38:04 34.8N 118.9W MB=4.1 NEIC SOUTHERN CALIFORNIA
O: 12JUL2026 10:38:04 34.8N 118.9W MW=4.1 EMSC CENTRAL CALIFORNIA
O: 12JUL2026 13:01:33 34.8N 118.9W ML=2.2 EMSC CENTRAL CALIFORNIA
O: 12JUL2026 17:53:11 34.8N 118.9W ML=2.8 EMSC CENTRAL CALIFORNIA
O: 12JUL2026 22:37:38 34.8N 118.9W ML=2.1 EMSC CENTRAL CALIFORNIA
O: 12JUL2026 17:53:11 34.8N 118.9W MB=2.9 NEIC SOUTHERN CALIFORNIA
NEIC reported an earthquake of M 4.2 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaska in Girdwood, Kenai, Anchorage, Willow, Cooper Landing, Homer, Chugiak, Eagle River and Soldotna.
The second M 4.2 was reported with intensity III in Alaska at Girdwood, Kasilof, Anchorage, and II in Anchor Point, Homer and Ninilchik.
O: 12JUL2026 06:00:44 59.7N 153.0W MB=4.2 NEIC SOUTHERN ALASKA
O: 12JUL2026 22:11:06 59.7N 152.5W ML=4.2 EMSC SOUTHERN ALASKA
O: 12JUL2026 22:11:06 59.7N 152.5W MB=4.2 NEIC SOUTHERN ALASKA
NEIC reported an earthquake of M 3.0 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in Fortuna and Eureka.
O: 13JUL2026 06:14:17 40.5N 124.3W MB=3.0 NEIC NORTHERN CALIFORNIA
O: 13JUL2026 06:14:17 40.5N 124.3W MD=3.0 EMSC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 5.4 in Luzon, Philippines was felt with intensity up to II-III in the area(s) of Luzon, Philippines in Bicol with V in Claveria; III in Tabaco, Sagpon and II in Marupit.
O: 13JUL2026 00:54:02 12.8N 123.0E MB=5.4 NEIC LUZON, PHILIPPINES
O: 13JUL2026 00:54:03 12.8N 123.0E MW=5.4 EMSC MASBATE REGION, PHILIPPINES
NEIC reported an earthquake of M 3.6 in Southern Texas was felt with intensity up to II-III in the area(s) of Southern Texas in San Antonio.
This earthquake occurred near local solar noon and may have been promoted
by tidal and/or geomagnetic stresses which maximize near this hour.
The last earthquake in southern Texas within about 200 km of today's epicenter
with M>=3.6 was an M 3.6 on January 31, 2025 - an aftershock of an M 4.5 on January 30, 2025. The
only other event in the area in the past 15 years of significantly larger magnitude
than that of today was an M 4.7 on February 17, 2024. At the time of the M 4.5 in January,
2025 this summary noted:
"A moderate M 4.5 earthquake occurred in the Falls City, Southern Texas region today. NEIC reported this earthquake was felt with maximum intensity V in Southern Texas at Gillett, Bastrop; IV in Ecleto, Falls City, Hobson, Karnes City, Kenedy, Poth, Runge, Stockdale, San Antonio; III in Whitney, Richmond, Devine, Jourdanton, Kerrville, Pleasanton, Adkins, Cibolo, Converse, Floresville, La Vernia, Marion, New Braunfels, Nixon, Saint Hedwig, Schertz, Seguin, Smiley, Sutherland Springs, Yorktown, San Antonio, Burnet, Del Valle, Elgin, Leander, Manor, Round Rock Austin and as far as 200 km from the epicenter.
It may have been promoted by the new moon which arrived today
...
This earthquake follows a series of minor to moderate quakes in the area over the past several years and has been
covered in this summary. Two earthquakes of M>=4.5 have hit this area within about
200 km of this epicenter in the past 35 years - an M 4.8 on October 20, 2011 and an M 4.7 on February 7, 2024. When the M 4.4 and 4.7 hit the area on
February 17, 2024, this summary noted:
"The strongest earthquake in the U.S. or Canada today was an M 4.7 in southern Texas. This event was reported by NEIC to have been felt with intensity up to VI in Falls City, Texas.
Aftershocks of M 3.7 and 3.3 followed and were felt in the same area. EMSC reported
the mainshocks were felt as far as San Antonio where beds shook and people were awakened. It followed
a series of foreshocks including an M 4.4 twelve minutes earlier which was felt with intensity
up to V in Falls City, Texas. An M 3.9 foreshock was also felt with intensity up to
V in the Falls City area of Texas. Today's activity occurred within minutes
of local solar midnight and may have been promoted by strong tidal stresses
which maximize near this hour. An X2.3 solar flare occurred on February 16, 2024
when this epicenter was at local solar midnight. This flare may have helped
trigger this unusually large earthquake.
...
Today's activity follows an M 3.9 in the same area of Texas which occurred on February 12, 2024 and
was noted in this summary at the time as:
"An earthquake of M 3.8-3.9 also shook southern Texas today. NEIC reported it was felt with intensity up to IV in the Falls City, Texas area.
The only earthquake within about 100 km of this epicenter of M>3.9 in the
past 35 years were events of M 4.8 on October 20, 2011 and M 4.3 on April 9, 1993.
An M 3.3 hit the same area on February 9, 2024. At the time this summary noted:
"A light earthquake of M 3.3 also occurred in Southern Texas today.
NEIC reported this earthquake of M 3.3 in Southern Texas was felt with intensity up to IV in the area(s) of Southern Texas in Falls City.
Light earthquakes in this region began in late 2020. The largest earthquakes
in the region in recent years were of M 3.9-4.0 on October 9, 2023 and September 14, 2023.
Recent events in the area suggest triggering at this level in this area
is likely at this time." (February 9, 17, 2024)
On October 20, 2011 when this series began in earnest this summary noted:
"The unusual earthquake in southern Texas was the strongest in that region
in recorded history. The only event of M>=4 in the area since 1990 was an
M 4.3 on April 9, 1993. There is no record of any earthquake in this area
off south-central Texas of M>4 since events were first recorded in the area
nearly 200 years ago. It may be due to oil extraction in the area but
this is simply speculation. This is one of the strongest earthquakes ever
recorded in Texas...."( January 30, 2025)
O: 12JUL2026 20:52:20 28.6N 99.1W MB=3.6 NEIC SOUTHERN TEXAS
O: 12JUL2026 20:11:25 28.6N 99.1W ML=2.4 EMSC SOUTHERN TEXAS
O: 12JUL2026 20:52:20 28.6N 99.1W ML=3.5 EMSC SOUTHERN TEXAS
O: 13JUL2026 06:09:35 28.8N 99.0W ML=2.1 EMSC SOUTHERN TEXAS
O: 12JUL2026 11:24:51 28.9N 99.0W ML=2.1 EMSC SOUTHERN TEXAS
O: 13JUL2026 01:44:54 28.9N 99.0W ML=2.6 EMSC SOUTHERN TEXAS
NEIC reported an earthquake of M 3.8 off the coast of Oregon was felt with intensity up to II-III in the area(s) of off the coast of Oregon near Bandon.
This epicenter is at the sixth node (60 degrees) from Venezuela and may have
been promoted by energy from that source.
O: 12JUL2026 17:49:02 43.4N 127.2W MB=3.8 NEIC OFF COAST OF OREGON
O: 12JUL2026 17:49:02 43.4N 127.3W MB=3.8 EMSC OFF COAST OF OREGON
NEIC reported an earthquake of M 4.6-4.8 in South Island, New Zealand was felt with intensity up to II-III in the area(s) of South Island, New Zealand in Woodend Canterbury.
GeoNet reported the following data for this earthquake:
This epicenter is near the third node (120 degrees) from Venezuela and may
have been promoted by energy from that source.
O: 12JUL2026 16:31:07 42.6S 173.5E MS=4.8 GEONET Felt with light intensity in the area of Hammer Springs, New Zealand and in southern North Island. Of 333 felt reports 152 reports of weak and 145 of light intensity with 33 of moderate shaking and 2 with strong 0 with severe and 1 with extreme intensity came from the area.
O: 12JUL2026 16:31:08 42.5S 173.5E MB=4.6 NEIC SOUTH ISLAND, NEW ZEALAND
O: 12JUL2026 16:31:08 42.6S 173.5E MB=4.6 EMSC SOUTH ISLAND OF NEW ZEALAND
NEIC reported an earthquake of M 4.6 in the South Sandwich Islands may have been felt with intensity up to II-III in the area(s) of the South Sandwich Islands.
This epicenter is near the fifth node (72 degrees) from Venezuela and may
have been promoted by energy from that source.
O: 12JUL2026 15:15:57 55.6S 27.3W MB=4.6 NEIC SOUTH SANDWICH ISLANDS
O: 12JUL2026 15:15:57 55.6S 27.3W MB=4.6 EMSC SOUTH SANDWICH ISLANDS REGION
NEIC reported an earthquake of M 5.3 in Sulawesi, Indonesia was felt with intensity up to II-III in the area(s) of Sulawesi, Indonesia in Manado.
O: 12JUL2026 10:05:38 0.2N 122.4E mb=4.7 EMSC MINAHASA, SULAWESI, INDONESIA
O: 12JUL2026 13:46:37 1.2N 121.4E MB=5.3 EMSC MINAHASA, SULAWESI, INDONESIA
O: 12JUL2026 13:46:37 1.2N 121.4E MB=5.3 NEIC SULAWESI, INDONESIA
NEIC reported an earthquake of M 5.1 in Sumbawa, Indonesia was felt with intensity up to II-III in the area(s) of Sumbawa, Indonesia in Timur at Waingapu with IV and III in Ruteng.
This epicenter is near the antipode of recent major earthquakes in Venezuela
and may have been promoted by antipodal energy concentration from that source.
Similar elevated activity near the antipode of Venezuela is currently
occurring near Krakatora and south of Java and is expected to continue
with additional moderate earthquakes in this region.
O: 12JUL2026 13:20:25 9.6S 119.3E MB=5.1 NEIC SUMBAWA, INDONESIA
O: 12JUL2026 13:20:21 9.7S 119.3E MB=5.1 EMSC SUMBA REGION, INDONESIA
NEIC reported an earthquake of M 3.0 in Nevada was felt with intensity up to II-III in the area(s) of Nevada near Las Vegas.
O: 12JUL2026 12:36:02 36.7N 115.7W MB=3.0 NEIC NEVADA
NEIC reported an earthquake of M 3.3 in Hawaii was felt with intensity up to II-III in the area(s) of Hawaii in Pahoa.
This epicenter is south of Hawaii and is at the sub-solar latitude for today.
It may have been promoted by sub-solar stresses as it occurred near local
solar midnight.
O: 12JUL2026 11:43:49 18.8N 155.1W MB=3.3 NEIC HAWAII
NEIC reported an earthquake of M 4.5 in the Fox Islands, Aleutians, Alaska was felt with intensity up to II-III in the area(s) of the Fox Islands, Aleutians, Alaska with III in Unalaska, Alaska.
O: 12JUL2026 11:23:48 53.6N 166.7W MB=4.5 NEIC FOX ISLANDS
EMSC reported an earthquake of M 4.8 in Russia-Mongolia border was felt with intensity up to IV in the area(s) of Russia-Mongolia border in Russia at Shamanka, Angarsk, Markova, Irkutsk, and Dzerzhinsk.
This epicenter is near the third node (120 degrees) from Venezuela and may
have been promoted by energy from that source.
O: 13JUL2026 02:18:40 51.6N 102.0E MB=4.8 EMSC RUSSIA-MONGOLIA BORDER
EMSC reported an earthquake of M 4.3 in Meghalaya, India was felt with intensity up to IV in the area(s) of Meghalaya, India at Guwahati.
This event occurred within minutes of local solar noon near the sub-solar
latitude today and may have been promoted by tidal and/or geomagnetic
stresses with the new moon of July 14, 2026 (see above).
O: 12JUL2026 06:30:39 25.6N 90.6E MB=4.3 EMSC MEGHALAYA, INDIA REGION
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
No Tropical cyclones are currently active
A tropical cyclone may be forming in the north Pacific. This system is currently
at 11N 136E and moving to the WNW with lines up to 28 kts. No immediate
effects on regional seismicity are expected with this storm at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 12, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
7390 0015 0057 0260 C5.9 (July 12, 2026) 1.5E-02 *
Kamchatka M 4.4 00:20 UT
Guerrero M 4.0 00:36 UT
Talaud M 4.9 00:43 UT
7440 0717 0811 0842 M1.1 (July 12, 2026) 3.3E-02
Southern East Pacific Rise M 5.5 07:29 UT
Southern California M 4.1 10:38 UT
Central California M 2.4 08:02 UT
Fiji M 4.1 08:45 UT
Siberia M 4.4 08:03 UT
Kamchatka M 4.3 08:52 UT
7510 1346 1358 1406 C2.6 (July 12, 2026) 2.1E-03
Minahasa, Sulawesi M 5.3 13:46 UT
7520 1523 1532 1536 C1.0 (July 12, 2026) 8.7E-04
7550 1536 1540 1543 C1.0 (July 12, 2026) 5.5E-04
7560 1952 1959 2010 B8.9 (July 12, 2026) 9.3E-04
Oacaca M 3.9, 3.9 19:55 UT 20:01 UT
Southern Texas M 2.4 20:11 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: unsettled July 13 quiet July 14-15. Solar M-flare chance: 25% X-class: 5% proton storm: 1%
AP Indicies: global: 18, high: 40, mid-latitude: 16, time of max k: 09:00-12:00 UT; Max k: 7 Global Kp 4.67 1100-1200, July 12; Sunspot Number: 70; Radio Flux: 107
July 12, 2026
Notable earthquakes and events:
The new moon will arrive on July 14, 2026 at 09:43 UT. Longitudes at local solar noon are near 39 East while those at local solar midnight are near 141 West longitude. These include Hawaii and areas of eastern Alaska and western Canada and to a lesser extent areas off the coast of Oregon and California while in the east they include Eastern Turkey as well as Ethiopia and areas off southern Africa. These and surrounding areas are the most likely to see tidally enhanced seismicity at this time. A moderate to large earthquake is possible in central or eastern Turkey at this time.
The strongest earthquake in the world today was an M 6.4 in the South Sandwich
Islands of the southern Atlantic region. It was not reported felt in this
remote area. A tsunami was neither expected nor observed with this earthquake. The last earthquake of M>=6.4 in the South Sandwich Islands was
an M 7.1 on August 22, 2021. At the time this summary noted:
"The strongest earthquake in the world today was an M 7.0-7.1 in the South Sandwich
Island, the strongest aftershock to date of the August 12, 2021 M 8.1 and is
approximately the size of the earthquake in Haiti of August 14 (M 7.2).
It was accompanied by a strong series of earthquakes including an M 5.8.
Tidal stresses (see above) were near their maximum in the South Sandwich Islands
today with the full moon and probably helped enhance this activity." (August 22, 2021)
Today's earthquake in the South Sandwich Islands follows a series of moderate
to strong earthquakes which began in early July. This series was discussed
in the previous issue of this summary as:
"The strongest earthquake of the day in the world was an M 5.4 in the South Sandwich
Islands area of the South Atlantic. This area has seen seismic enhancement since
the full moon of June 29, 2026 including an M 4.9 several hours before today's
event. It had been near local solar midnight when that full moon was finalized
and was expected (by this summary) to see subsequent seismic enhancement
at this time as:
"The full moon arrived on June 29, 2026 at 23:57 UT. Longitudes which are at local solar midnight at this time are located at about 0 East while those at local solar noon are near 180 West/East. In the east these include most of western Europe, England and Iceland and the south Mid-Atlantic Ridge and the South Sandwich Islands while in the west areas of the western Aleutians, Alaska, Hawaii, Tonga/Fiji/Kermadec Islands, New Zealand to the Balleny Islands and portions of the Pacific-Antarctic Ridge are included. These are the most likely areas to see significant tidal triggering with this full moon. Other areas may also see tidal promotion in the next week especially at times of large solar flares and near local solar midnight and solar noon. The likelihood of a strong associated earthquake with this full moon are moderate to high." (June 28 to July 2, 2026)
Further activity in the South Sandwich Islands is expected at this time. This
includes the possibility of a strong regional earthquake in the next several
days. The area was strong influenced by the strong geomagnetic storm of the
past several days as noted in this summary in previous issues:
"A series of earthquakes occurred at various epicenters in the South Sandwich
Islands and southwest of Africa with moderate intensity. These were all
oceanic events and were not felt in the epicentral area. This area was
near local solar noon at the time of the full moon of June 29, 2026
and had been expected to see enhanced seismicity at this time in the
seismic forecast in this summary .. " (July 3, 2026, July 11, 2026)
This epicenter is at 145 degrees from the landfall position of Typhoon Bavi
today and at the fifth node (72 degrees) from Venezuela and may have been promoted
by constructive interference of energy from those sources.
O: 11JUL2026 10:26:44 55.6S 28.9W MB=6.4 NEIC SOUTH SANDWICH ISLANDS REGION
O: 11JUL2026 06:52:27 59.6S 26.4W MB=5.4 NEIC SOUTH SANDWICH ISLANDS REGION
The second strongest earthquake in the world today occurred directly west
of the M 6.4 in the South Sandwich Island (see above) in the Southern East
Pacific Rise where an M 5.5 was recorded. At M 6.4 this is the strongest
earthquake in the Southern East Pacific Rise within about 200 km of this
epicenter in at least 35 years. The strongest earthquake within about 300
km of today's earthquake in the past 35 years was an M 6.6 on May 20, 2026
about 300 km east of today's epicenter. Today's event may have been promoted
by stress redistribution in the area from that quake which was discussed
at the time in this summary as:
"A strong M 6.6 earthquake hit the South East Pacific Rise today at 122 West
longitude. This event was not reported felt in this remote area and
a tsunami is unlikely. EMSC shows an aftershock of M 5.2 about 53 minutes
after the mainshock. The mainshock is the strongest recorded within
about 300 km of this epicenter since an M 6.6 on August 6, 2001 nearly
25 years ago.
This epicenter is at 122 West longitude, a longitude which was particularly stressed
during the new moon of May 16 as reported in previous issues of this summary:
"The new moon will arrive on May 16, 2026 at 20:01 UT. Longitudes which are at local solar noon at this time are near 120W and those at local solar midnight near 60E. In the west these include western North America (including California, Oregon and Washington) and portions of the East Pacific Rise and in the east portions of the central Indian Ocean and Central Asia near Hindu Kush, Iran, Pakistan and Afghanistan among others. These areas are most likely to see tidal triggering in the next week. A large earthquake is possible in this time and tidal triggering is not limited to these regions but is most likely near local solar noon or local solar midnight." (May 14-28, 2026)
This epicenter is also nearly antipodal to a highly unusual pair of earthquakes
that struck on May 5 in the Ural Mountains of Russia. ..." (May 20, 2026)
Today's event in the Southern East Pacific Rise occurred within minutes of
local solar midnight and may have been promoted by tidal and/or geomagnetic
stresses which maximize near this hour.
This earthquake appears to have been promoted by SFE from an M-class solar
flare. The quake occurred within minutes of local solar midnight near the
peak of an M1.1 solar flare, the first M-class solar flare since July 9 (M1.1 #6940).
Only two other M-class flares have been listed by SWPC in the past five days.
Preliminary data on this flare from SWPC follow.
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0717 0811 0842 M1.1 (July 12, 2026) 3.3E-02
A strong excursion in the geomagnetic field intensity at GOES satellites
was also recorded by both GOES 18 and 19 magnetometers. This began about 06:45 UT
to about 07:15 UT.
O: 12JUL2026 07:29:24 54.5S 118.9W MB=5.5 NEIC SOUTHERN EAST PACIFIC RISE
O: 12JUL2026 07:29:23 54.6S 119.0W MB=5.5 NEIC SOUTHERN EAST PACIFIC RISE
NEIC reported an earthquake of M 4.2 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaska in Girdwood, Kenai, Anchorage, Willow, Cooper Landing, Homer, Chugiak, Eagle River and Soldotna.
O: 12JUL2026 06:00:44 59.7N 153.0W MB=4.2 NEIC SOUTHERN ALASKA
NEIC reported an earthquake of M 2.7 in Northern California was felt with intensity up to II-III in the area(s) of Northern California at Fortuna.
O: 12JUL2026 03:35:05 40.5N 124.3W MB=2.7 NEIC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 4.9 in Molucca, Indonesia was felt with intensity up to II-III in the area(s) of Molucca, Indonesia in Manado, Sulawesi.
O: 12JUL2026 00:43:30 3.7N 127.0W MB=4.9 NEIC MOLUCCA, INDONESIA
NEIC reported an earthquake of M 3.6 in Central Alaska was felt with intensity up to II-III in the area(s) of Central Alaska near Petersville.
O: 11JUL2026 16:00:56 63.1N 150.4W MB=3.6 NEIC CENTRAL ALASKA
NEIC reported an earthquake of M 5.4 in Mindanao, Philippines was felt with intensity up to II-III in the area(s) of Mindanao, Philippines with IV in San Jose, III in Buayan, Tingacan and II in Manado, Sulawesi, Indonesia.
O: 11JUL2026 10:51:12 5.0N 125.5E MB=5.4 NEIC MINDANAO, PHILIPPINES
EMSC reported an earthquake of M 4.5 in the Bay of Bengal was felt with intensity up to IV in the area(s) of the Bay of Bengal in India at Yarada and Visakhapatnam.
This earthquake was nearly sub-solar and may have been promoted by sub-solar
effects on this date.
This epicenter is at 142 degrees from Venezuela and may have been promoted
by energy from that source.
O: 11JUL2026 23:35:45 16.5N 84.5E MB=4.5 EMSC BAY OF BENGAL
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
SUPER TYPHOON BAVI (09W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP BAVI 2026-07-12 00:00 UT 28.7N 120.4E 75 kts West of Ryukyu Islands, Japan
Super Typhoon Bavi (TD 09W) continued today as it made landfall in the Japanese Ryukyu Islands with winds up to 75 kts. It is expected to track to the northwest over the day and to dissipate in the next day. The antipode of today's location of Bavi is near 28S 60W over eastern Brazil and is not likely to see enhanced seismicity at this time as it is generally a seismic quiet zone.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 11, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0717 0811 0842 M1.1 (July 12, 2026) 3.3E-02
XXXX 0015 0045 0260 C6.0 (July 12, 2026) 6.3E-03
7250 0332 0337 0343 C1.1 (July 11, 2026) 6.1E-04
Antofagasta M 2.7 03:31 UT
7350 2002 2013 2030 C1.0 (July 11, 2026) 1.7E-03
Antofagasta M 4.0 20:25 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: minor storms July 12 unsettled July 13 quiet July 14. Solar M-flare chance: 25% X-class: 5% proton storm: 1%
AP Indicies: global: 7, high: 7, mid-latitude: 9, time of max k: 05:00-08:00 UT; Max k: 3 Global Kp 2.33 0000-0600, July 11; Sunspot Number: 82; Radio Flux: 112
July 11, 2026
Notable earthquakes and events:
The new moon will arrive on July 14, 2026 at 09:43 UT. Longitudes at local solar noon are near 39 East while those at local solar midnight are near 141 West longitude. These include Hawaii and areas of eastern Alaska and western Canada and to a lesser extent areas off the coast of Oregon and California while in the east they include Eastern Turkey as well as Ethiopia and areas off southern Africa. These and surrounding areas are the most likely to see tidally enhanced seismicity at this time. A moderate to large earthquake is possible in central or eastern Turkey at this time.
The strongest earthquake of the day in the world was an M 5.4 in the South Sandwich
Islands area of the South Atlantic. This area has seen seismic enhancement since
the full moon of June 29, 2026 including an M 4.9 several hours before today's
event. It had been near local solar midnight when that full moon was finalized
and was expected (by this summary) to see subsequent seismic enhancement
at this time as:
"The full moon arrived on June 29, 2026 at 23:57 UT. Longitudes which are at local solar midnight at this time are located at about 0 East while those at local solar noon are near 180 West/East. In the east these include most of western Europe, England and Iceland and the south Mid-Atlantic Ridge and the South Sandwich Islands while in the west areas of the western Aleutians, Alaska, Hawaii, Tonga/Fiji/Kermadec Islands, New Zealand to the Balleny Islands and portions of the Pacific-Antarctic Ridge are included. These are the most likely areas to see significant tidal triggering with this full moon. Other areas may also see tidal promotion in the next week especially at times of large solar flares and near local solar midnight and solar noon. The likelihood of a strong associated earthquake with this full moon are moderate to high." (June 28 to July 2, 2026)
Further activity in the South Sandwich Islands is expected at this time. This
includes the possibility of a strong regional earthquake in the next several
days. The area was strong influenced by the strong geomagnetic storm of the
past several days as noted in this summary in previous issues:
"A series of earthquakes occurred at various epicenters in the South Sandwich
Islands and southwest of Africa with moderate intensity. These were all
oceanic events and were not felt in the epicentral area. This area was
near local solar noon at the time of the full moon of June 29, 2026
and had been expected to see enhanced seismicity at this time in the
seismic forecast in this summary .. " (July 3, 2026)
An unusually large M 4.9 earthquake was widely felt near Grebocice, Poland today.
NEIC reported it was felt with intensity IV in Dolnoslaskie, Poland at Lubin and Polkowice.
EMSC reported long and intense shaking in Poland at Rudna, Lubin, Polkowice, Scinawa, Osiek, Glogow, Szlichtyngowa, Jemielno, Kunice, and Strzelin.
This event could be related to the upcoming new moon of July 14 as it is near the
longitude of maximum tidal stress with that event (see above). The last earthquake
in Poland within about 200 km of this epicenter with M>=4.9 occurred with M 5.0
on July 20, 2018 and prior to that an M 5.0 on December 30, 2010. These are
likely related to regional mining in the area but are not mine collapses.
When the M 5.0 on July 20, 2018 occurred this summary noted:
"An M 4.5-5.0 in Poland was reported felt near Europe's largest copper mine near Polkowice, Poland with strong intensity,
perhaps a rockburst or collapse. It was also reported felt in Lubin, Poland
and woke many. The last earthquake in Poland within about 300 km of this epicenter
with M>=5 occurred on December 30, 2010 (M 5.0) nearly eight years ago. The only
quake of significantly larger magnitude in this area since 1990 was an M 5.4 on December 31, 1999. As this occurred within about an hour of the turn of the millenium, it is possible it was artifically promoted as part of a millenium celebration." (July 20, 2018)
This epicenter is at 103 degrees from Antofagasta, Chile and near that distance
from Mindanao and Sulawesi and may have been promoted by energy from those
sources.
O: 11JUL2026 06:11:59 51.5N 16.2E MB=4.9 NEIC POLAND
O: 11JUL2026 06:11:59 51.5N 16.2E MB=4.8 EMSC POLAND
The strongest earthquake in the U.S. or Canada today was a moderate M 4.4 in the
Covelo area of northern California. NEIC reported it was widely felt with intensity IV in Covelo, Eureka and Branscomb, California III in Santa Rosa, Dos Rios, Laytonveille, Westport and II in Morgan Hill, Magalia, Red Bluff, Myers Flat, Mendocino, Willits, Ukiah, Potter Valley, San Mateo, Littleriver, Fort Bragg and Yuba City.
EMSC reported it may have been lightly felt in Cottonwood and Fort Bragg.
The mainshock was preceded by several light foreshocks including an M 3.8 which
occurred near local solar noon and may have been promoted by tidal and/or
geomagnetic stresses which maximize near this hour. That foreshock was reported
by NEIC to have been felt with intensity III in Covelo and II in Denair, California.
This is the strongest earthquake within the state of California (not including
offshore events) within about 100 km of this epicenter since an M 5.6 about 100 km
south of today's epicenter on June 24, 2026. The last event of M>4.4 prior
to that earthquake last month occured as an M 4.6 on May 17, 1995. When
a similar M 4.3-4.4 hit the area nearly exactly 14 years ago on July 8, 2012, this summary noted:
"NEIC reported that this earthquake of M 4.3 in Northern California was felt with intensity () in California at:
(3) Albion, (2) Branscomb, (2) Calistoga, (3) Caspar, (2) Clearlake Oaks, (3) Comptche, (4) Fort Bragg, (3) Fremont, (1) Gualala, (2) Kelseyville, (2) Laytonville, (2) Leggett,
(3) Littleriver, (2) Manchester, (2) McKinleyville, (3) Mendocino, (2) Petrolia, (2) Philo, (2) Point Arena, (2) Potter Valley, (2) Selma, (3) Westport,
(3) Whitethorn and (2) Willits. The epicenter was about 140 miles north of
San Francisco near Fort Bragg in Mendocino Caounty. No damage
was reported with this earthquake. This is the strongest earthquake to
hit in this region of Northern California in the past four years. The
last earthquake of similar or larger size hit this region on April 18, 2007.
There have been three other events of similar or larger magnitude in the
area in the past 22 years, on April 17, 2000 (M 4.5); December 7, 2001 (M 4.3)
and December 14, 2001 (M 4.4)." (July 9, 2012)
This epicenter is at 103 degrees from Mindanao and at the fourth node (90 degrees)
from Typhoon Bavi and may have been promoted by energy from those sources.
O: 11JUL2026 01:14:37 39.9N 123.2W MB=4.4 NEIC NORTHERN CALIFORNIA
O: 11JUL2026 05:15:26 39.9N 123.2W MD=2.1 EMSC NORTHERN CALIFORNIA
O: 10JUL2026 22:33:18 39.9N 123.2W MD=2.7 EMSC NORTHERN CALIFORNIA
O: 10JUL2026 22:53:12 39.9N 123.2W MD=2.5 EMSC NORTHERN CALIFORNIA
O: 11JUL2026 01:14:37 39.9N 123.2W Mw=4.4 EMSC NORTHERN CALIFORNIA
O: 10JUL2026 22:05:08 39.9N 123.2W MW=3.5 EMSC NORTHERN CALIFORNIA
O: 10JUL2026 22:05:08 39.9N 123.2W MB=3.8 NEIC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 5.1 in Central Peru was felt with intensity up to II-III in the area(s) of Central Peru in Lima at San Luis with IV and Santa Maria with III and with II in Huaraz, Ancash.
This epicenter is on the geomagnetic equator and at 103 degrees from the North
and South Geomagnetic poles and may have been promoted by energy from those sources.
O: 11JUL2026 07:58:27 10.9S 79.0W MB=5.1 NEIC CENTRAL PERU
NEIC reported an earthquake of M 2.7 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in Kelseyville, Napa and San Rafael.
O: 11JUL2026 03:29:17 38.8N 122.8W MB=2.7 NEIC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 2.6 in Oregon was felt with intensity up to II-III in the area(s) of Oregon in Neotsu and Lincoln City.
O: 10JUL2026 20:24:39 45.0N 123.8W MB=2.6 NEIC OREGON
NEIC reported an earthquake of M 3.1 in Hawaii was felt with intensity up to II-III in the area(s) of Hawaii with III in Kealakekua, Dailua Kona and II in Captain Cook Holualoa.
O: 10JUL2026 19:25:11 19.4N 155.9W MB=3.1 NEIC HAWAII
EMSC reported an earthquake of M 4.2 in Yemen was felt with intensity up to IV in the area(s) of Yemen in Ash Shaykh 'Uthman.
O: 11JUL2026 05:19:22 13.1N 44.9E MB=4.2 NEIC YEMEN
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
SUPER TYPHOON BAVI (09W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP BAVI 2026-07-11 00:00 UT 26.9N 124.9E 80 kts Ryukyu Islands, Japan
Super Typhoon Bavi (TD 09W) continued today as it made landfall in the Japanese Ryukyu Islands with winds up to 80 kts. It is expected to track to the northwest over the several days. It os expected to make landfall in the Ryukyu Islands, Japan around July 11 where a moderate to strong earthquake may occur near that time. The antipode of today's location of Bavi is near 24S 58W over eastern Brazil and is not likely to see enhanced seismicity at this time as it is generally a seismic quiet zone.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 10, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
7170 1433 1459 1520 C6.0 (July 10, 2026) 1.1E-02
Venezuela M? 14:54 UT
Yemen M 3.4 15:14 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active July 11 minor storms July 12 unsettled July 13. Solar M-flare chance: 30% X-class: 5% proton storm: 1%
AP Indicies: global: 12, high: 21, mid-latitude: 12, time of max k: 09:00-12:00 UT; Max k: 5 Global Kp 3.67 0600-0900, July 10; Sunspot Number: 62; Radio Flux: 107
July 10, 2026
Notable earthquakes and events:
A moderate earthquake of M 4.5 occurred west of Hawaii today. NEIC reported it was
felt throughout the island of Hawaii with intensity III and reported from Captain Cook, Mountain View, Kailua Kona, Kealakekua, Holualoa, Naalehu, Pepeekeo, Kailua, with II in Paauilo, Lahaina, Honokaa, Pahala, Hawaii National Park, Kamuela, Kurtistown, Laupahoehoe, Kula and Kapaau among others.
EMSC reported it was felt in Hawaii at Hawaiian Ocean View, Honaunau-Napoopoo and Kalaoa.
This is the largest non-volcanic earthquake within about 100 km of this epicenter
in Hawaii since an M 4.6 on June 3, 2026. That event was at sub-solar conditions
with the sun overhead at noon at 19.5 north latitude on that date.
The epicenter of today's event at 19.2 north latitude is also at the sub-solar latitude
for July 9-10 and was likely triggered by those sub-solar conditions. In a
previous issue of this summary sub-solar activity in Hawaii had been reviewed as:
"NEIC reported an earthquake of M 3.3 in Hawaii was felt with intensity up to II-III in the area(s) of Hawaii in Pahala, Naalehu, Waikoloa, Holualoa, Hawaii National Park, Volcano, Pepeekeo.
EMSC reported sudden shaking in Hawaiian Ocean View. Like the earthquakes
in the Virgin Islands and Maharshtra, India (see above) this event in Hawaii
is at today's sub-solar latitude (19.2 degrees north) and was probably
promoted by strong tidal and/or geomagnetic stresses which maximize
in vertical directions under these circumstances.
Hawaii is no stranger to sub-solar tectonic earthquakes in early July. For example
one of the strongest earthquake in Hawaii in recent years occurred on July 5, 2021
with M 5.2 and was also exactly sub-solar at 20.2 north latitude. earthquakes
of M>=3.5 have hit in Hawaii at sub-solar latitudes early July in each of
the past 10 years with the exception of 2025 indicating this is a powerful
triggering circumstance for earthquakes in Hawaii." (July 8-9, 2026)
Other seismic regions nearing sub-solar conditions in the next several days
include Guerrero and central Mexico and northern Philippines among others.
Moderate seismic enhancement in these areas is possible at this time due
to sub-solar stresses.
NEIC lists a second earthquake in Hawaii occurring one second before the M 4.5 but about 100 km
east of that epicenter. This event of M 3.4 could be confused with effects
from the M 4.5 a second later. NEIC reported it was felt with intensity II-III
in Naalehu, Captain Cook, Kamuela.
O: 10JUL2026 06:17:25 19.2N 156.4W ML=4.5 NEIC HAWAII
O: 10JUL2026 06:17:24 19.3N 155.4W ML=3.4 NEIC HAWAII
It was a relatively quiet day in global seismicity. Two of the largest earthquakes
of the day occurred in the Loyalty Islands with M 4.7 and M 4.5. These occurred
near local solar noon but were not reported felt in this remote area near
New Caledonia in the southwest Pacific area. These may have been promoted
by a strong excursion in the geomagnetic field recorded as beginning
around 02:40 UT on the GOES-19 magnetometer. An arcjet maneuver was required
to stabilize the orbit of GOES 19 - this occurred at 03:00 UT and ended
at 04:38 UT on July 10, 2026 when normal operations resumed.
This summary has previously discussed a number of similar simultaneous
geomagnetic excursions and earthquakes in previous issues. This appear
to be the latest such "coincidence".
O: 10JUL2026 02:41:56 21.9S 170.3E ML=4.7 NEIC LOYALTY ISLANDS
O: 10JUL2026 02:34:54 22.3S 170.0E ML=4.5 NEIC LOYALTY ISLANDS
A second spike in the geomagnetic field occurred later in the UT day of July 10
with the peak occurred at the GOES-18 magnetometer at 07:30 UT. This was
accompanied by an M 4.1 in the area of Iran north of the conflict zone near
the Strait of Hormuz also at 07:30 UT. This is within minutes of local
solar noon at the Iranian epicenter. Spikes of this type - as noted earlier in this
summary - could be caused by an electromagnetc pulse. Under certain circumstances
this could be useful in hostilities. Other hypotheses for this coincidence are possible however.
O: 10JUL2026 07:29:55 27.9N 57.6E ML=4.1 NEIC IRAN
NEIC reported an earthquake of M 5.0 in northern Mindanao and Leyte, Philippines was felt with intensity up to II-III in the area(s) of northern Mindanao, Philippines in Dapa Caraga.
EMSC reported light shaking in the Philippines at Wright and Baras.
This earthquake occurred near local solar midnight and was the second largest in
the world in the past 24 hours. It may have been promoted by energy from
tidal or geomagnetic stresses.
O: 09JUL2026 16:46:49 10.8N 125.2E ML=5.0 NEIC LEYTE, PHILIPPINES
NEIC reported an earthquake of M 3.5 in Central California was felt with intensity up to II-III in the area(s) of Central California with III in Big Sur, Castroville, Soquel, Capitola, Salinas, Hollister, Pacific Grove and II in Monterey, Pebble Beach, Soledad, Felton, Gonzales, Santa Cruz, gilroy, Pleasanton, Paicines, Watsonville, Seaside, Marina, Carmel, Morgan Hill, Scotts Valley, Aptos, King City, and Ben Lomond.
EMSC reported moderate shaking in California at Ridgemark, Chualar, Hollister, Marina, Del Rey Oaks, Pacific Grove, Old Fig Garden, Fresno.
The last earthquake of M>=3.5 within about 50 km of this epicenter occurred as an M 3.6
on May 17, 2026 and prior to that an M 3.5 on December 21, 2025.
O: 09JUL2026 14:49:17 36.6N 121.3W ML=3.5 NEIC CENTRAL CALIFORNIA
NEIC reported an earthquake of M 5.1 in Western Honshu, Japan was felt with intensity up to II-III in the area(s) of Shikoku, Japan in Kobe, Kyoto, Katsuura, Chiba, Osaka and Ako, Hyogo.
O: 09JUL2026 12:58:57 33.3N 135.0E ML=5.1 NEIC SHIKOKU, JAPAN
EMSC reported an earthquake of M 4.0 in Kazakhstan was felt with intensity up to IV in the area(s) of Kazakhstan in Zhabagly, Taraz, and in Tashkent, Uzbekistan.
O: 09JUL2026 19:59:33 42.4N 70.9E ML=4.0 EMSC CENTRAL KAZAKHSTAN
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
SUPER TYPHOON BAVI (09W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP BAVI 2026-07-10 00:00 UT 21.9N 126.9E 90 kts East of Taiwan
Super Typhoon Bavi (TD 09W) continued today east of Taiwan with winds up to 90 kts. It is expected to track to the northwest over the several days. It os expected to make landfall in the Ryukyu Islands, Japan and Taiwan around July 10-11 where a moderate to strong earthquake may occur near that time. The antipode of today's location of Bavi is near 22S 54W over eastern Brazil and is not likely to see enhanced seismicity at this time as it is generally a seismic quiet zone.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 9, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
6940 0217 0227 0229 M1.1 (July 9, 2026) 3.1E-03
Hawaii M 2.4 02:20 UT
6990 0651 0713 0735 C2.7 (July 9, 2026) 5.3E-03
Nevada M 2.9, 3.3 06:54 UT 06:59 UT
North Is. New Zealand M 3.0 06:51 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active July 10-11 quiet July 12. Solar M-flare chance: 40% X-class: 10% proton storm: 1%
AP Indicies: global: 16, high: 23, mid-latitude: 15, time of max k: 09:00-12:00 UT; Max k: 6 Global Kp 3.67 2000-2400, July 9; Sunspot Number: 77; Radio Flux: 110
July 9, 2026
Notable earthquakes and events:
A moderate geomagnetic storm may have begun around 10:00 UT on July 9. GFZ gives the Hp30 index
for this reaching 4.66 at 10:30-11:00 UT. This could enhance seismicity in western
Europe but only slightly.
NEIC reported an earthquake of M 3.4 in Nevada was felt with intensity up to II-III in the area(s) of Nevada in Bullhead City, Arizona.
O: 09JUL2026 06:59:06 36.7N 116.3W ML=3.4 NEIC NEVADA
O: 08JUL2026 23:36:16 36.7N 116.3W ML=2.5 EMSC NEVADA
O: 09JUL2026 06:54:18 36.7N 116.3W ML=2.9 EMSC NEVADA
O: 09JUL2026 06:59:06 36.7N 116.3W ML=3.3 EMSC NEVADA
NEIC reported an earthquake of M 5.0 in Sichuan, China was felt with intensity up to II-III in the area(s) of Sichuan, China in Nanchong.
O: 08JUL2026 23:44:13 28.5N 104.7E ML=5.0 NEIC SICHUAN, CHINA
O: 08JUL2026 23:44:13 28.5N 104.7E MW=5.0 EMSC EASTERN SICHUAN, CHINA
O: 09JUL2026 04:25:56 28.5N 104.7E ML=3.2 EMSC EASTERN SICHUAN, CHINA
NEIC reported an unusual earthquake of M 4.4 in Angola may have been felt with intensity up to II-III in the area(s) of may have been Licapa, Angola.
This is the strongest earthquake in Angola within about 200 km of this epicenter
since an M 4.6 on August 6, 1999 and an M 4.8 on February 20, 1993. The
last such event within about 300 km of this epicenter was an M 4.8 on August
4, 2020. Today's earthquake occurred within minutes of local solar midnight
and may have been promoted by tidal and/or geomagnetic stresses which
maximize near this hour.
This epicenter is at 103 degrees from Mindanao and the north geomagnetic pole and at the fourth node (90 degrees) from
Venezuela and the south geomagnetic pole and may have been promoted by energy from those sources.
O: 08JUL2026 23:27:05 7.6S 21.9E ML=4.4 NEIC ANGOLA
NEIC reported an earthquake of M 3.9 in Puerto Rico was felt with intensity up to II-III in the area(s) of Puerto Rico in Ensenada, Saban Grande, Lajas, Guaynabo, Cabo Rojo, Guayanilla and Hormigueros.
EMSC reported moderate shaking in Puerto Rico at Palomas, Yauco, San German, Utuado, and Cabo Rojo.
This is a near sub-solar earthquake which occurred near local solar noon. This
last earthquake of M>=3.9 in southern Puerto Rico with significantly
larger magnitude than M 3.9 was an M 5.1 on February 19, 2026. Recent sub-solar
earthquakes in early July have occurred as an M 4.5 (July 10, 2022); 4.5 (July 18, 2021); 5.3 (July 3, 2020);
It was likely promoted by tidal and/or geomagnetic stresses which maximize near this hour.
A series of sub-solar earthquakes occurred in the past two days including
events in Central India, Virgin Islands and Hawaii (see previous issue of
this summary for more details).
This epicenter is at 141 degrees from Typhoon Bavi and may have been
promoted by energy from that source.
O: 08JUL2026 20:07:31 18.0N 66.8W ML=3.9 NEIC PUERTO RICO
O: 08JUL2026 20:07:31 18.0N 66.8W ML=3.9 EMSC PUERTO RICO
O: 08JUL2026 10:05:29 18.8N 67.5W MD=3.1 EMSC PUERTO RICO REGION
Another series of earthquakes today which were at the sub-solar latitude
occurred in Maharashtra, India. The largest of these ocured within about 5 seconds of the
M 3.9 in Puerto Rico (see aboe) - compare 20:07:25 UT for the India event
with 20:07:31 UT for the event in Puerto Rico. EMSC reported moderate shaking from events
of M 4.1 and M 4.2 was felt in India at Hingoli, Nanded, Pathri, Basmat, Kalamnuri, Latur, Bijapur, Gulbarga Basavakalyan.
The sub-solar latitude on July 8 is 19.2 North latitude. The larger of these events occurred at 19.2N near local solar midnight,
another good example of sub-solar triggering of seismicity.
The last earthquake in Maharashtra, India with M>=4.2 occurred as an
M 4.5 on April 11, 2026 and before that two years ago on July 10, 2024. There
were no earthquakes of M>=4.2 within 200 km of this epicenter between 2001 and 2023.
Readers may note that the event in July, 2024 was also a sub-solar earthquake similar
to that that occurred today. At the time this summary noted:
"NEIC reported this earthquake of M 4.5 in India was felt with intensity up to V in the area(s) of India in Basmat.
EMSC reported moderate shaking in Idia at Mahaveer Society, Nanded, Hingoli. " (July 10, 2024)
This epicenter is at the fifth node (72 degrees) from the North Geomagnetic Pole; the sixth node
(60 degrees) from Honshu, Japan and the seventh node (51 degrees) from Typhoon
Bavi and may have been promoted by energy from those sources.
O: 08JUL2026 20:07:25 19.2N 76.9E MW=4.2 EMSC MAHARASHTRA, INDIA
O: 08JUL2026 21:53:10 19.5N 77.1E MW=4.1 EMSC MAHARASHTRA, INDIA
O: 08JUL2026 20:07:25 19.2N 77.0E MB=4.2 EMSC MAHARASHTRA, INDIA
O: 08JUL2026 20:45:09 19.6N 77.2E ML=3.6 EMSC MAHARASHTRA, INDIA
O: 08JUL2026 20:47:43 19.6N 77.2E ML=3.9 EMSC MAHARASHTRA, INDIA
O: 08JUL2026 21:53:10 19.6N 77.2E ML=4.1 EMSC MAHARASHTRA, INDIA
NEIC reported an earthquake of M 2.9 in Lake Michigan north of Chicago, Illinois was felt with intensity up to II-III in the area(s) of Lake Michigan north of Chicago, Illinois with IV in Illinois at Harwood Heights; III in Riverside, Palos Heights, Loves Park, Park Ridge, Addison, Chicago, Berwyn and Shorewood and in South Haven, and Spring Lake, Michigan; Ossian, Indiana, Milwaukee and Edgerton, Wisconsin, and Hillsboro, Missouri and as far as 100 km from the epicenter.
This earthquake occurred near local solar noon and may have been promoted by
tidal and/or geomagnetic stresses which maximize near this hour.
The last earthquake near Chicago with M>=2.9 occurred on July 15, 2024 with M 3.4 but
the last within about 100 km of today's event was an M 2.9 on March 25, 2015.
At the time this summary noted:
"The most unusual earthquake in the U.S. was associated with the strong tornadic storm
which earlier hit areas of eastern and central Oklahoma. As it moved into
Illinois and earthquake of M 2.9 was felt lightly west of Chicago. This earthquake
was reported by NEIC to have been lightly felt in Indiana at Highland and Hammond; in
Milwaukee, Beloit and Madison and in Illinois at Anna, Belleville, Champaign, Machesney Park, Rockford, South Beloit, Roscoe, Rockton, Rock Falls, Rochelle, Poplar Grove, Durand, Dixon, Davis Junction, Caledonia, Belvidere, Chicago, Yorkville, Waterman, North Aurora, Aurora, Orland Park, New Lenox, Lemont, Oak Park, Schaumburg, Hoffman Estates, Carol Stream, Wheaton, West Chicago, Union, South Elgin, Saint Charles, Schaumburg, Hoffman Estates, Lake in the Hills, Marengo, Lombard, Huntley, Hampshire, Glendale Heights, Gilberts, Genoa, Geneva, Elgin, Elburn, Dundee, Dekalb, Carpentersville, Bartlett, Algonquin, Woodstock, Wonder Lake, Waukegan, Wauconda, Palatine, Round Lake, Palatine, Northbrook, Vernon Hills, Mundelein, McHenry, Livertyville, Lake Zurich, Lake Villa, Island Lake, Ingleside, Highland Park, Gumee, Fox River Grove, Fox Lake, Deerfield, Crystal Lake, Cary, Barrington, Rolling Meadows, Elk Grove Village and Arlington Heights, Illionis.
The earthquake was accompanied by a loud earthquake noise. It is the strongest
in the area since an M 3.1 on November 4, 2013 and and M 3.8 on February 10, 2010
which had an epicenter near Elgin. There were no immediate reports of damage
or casualties from this light earthquake but it was widely heard and felt.
This is the strongest true earthquake within 150 km of this epicenter since the
M 3.8 on February 10, 2010. Other light earthquakes have hit the region of Illinois
in the past 25 years on December 17, 1990 (M 3.2); September 2, 1999 (M 3.5) and June 28, 2004 (M 4.2)." (March 25, 2015)
Today's epicenter is at the 10th node (36 degrees) from Venezuela
and may have been promoted by energy from that source.
O: 08JUL2026 19:38:43 42.2N 87.5W MW=2.9 NEIC LAKE MICHIGAN, ILLINOIS
NEIC reported an earthquake of M 5.5 in the Balleny Islands was not felt in this remote area.
This epicenter is antipodal to recent extensive seismic and volanic activity
in Iceland and the Reykjanes Ridge south of Iceland (see previous issue
of this summary for details).
This epicenter is at 120.0 degrees from Venezuela (the third node) and may have been
promoted by energy from that source.
O: 08JUL2026 19:07:10 61.8S 154.9E MW=5.5 NEIC BALLENY ISLANDS REGION
The strongest earthquake in the world today was an M 5.8 in the Loyalty Islands south of Vanuatu.
NEIC reported was possibly felt in Isangel, Vanuatu.
This epicenter is at the seventh node from the north Geomagnetic Pole (106 degrees)
and at 51 degrees from the South Geomagnetic Pole, Mindanao, Sulawesi and Typhoon Bavi
and may have been promoted by constructive interference of energy from those sources.
This earthquake in the Loyalty Islands may have been promoted by SFE associated
with solar flare 6740 as it occurred near the peak output of that C2.1 flare.
Data on this flare from SWPC follow.
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
6740 0940 0955 1001 C2.1 (July 8, 2026) 1.9E-03
Loyalty Is. M 5.8 09:50 UT
This epicenter is at the seventh node (52 degrees) from Typhoon Bavi and from Mindanao
and Sulawesi and may have been promoted by energy from those sources.
O: 08JUL2026 09:50:23 20.3S 168.8E MW=5.8 NEIC LOYALTY ISLANDS
O: 08JUL2026 09:50:27 20.3S 168.7E MW=5.8 EMSC LOYALTY ISLANDS
O: 08JUL2026 11:42:50 20.2S 168.9E Mw=5.2 EMSC LOYALTY ISLANDS
EMSC reported an earthquake of M 4.6 in Luzon, Philippines was felt with intensity up to IV in the area(s) of Luzon, Philippines in Baguio and Tuding.
O: 09JUL2026 06:33:45 16.4N 120.5E MW=4.6 EMSC LUZON, PHILIPPINES
EMSC reported an earthquake of M 4.5 in Tajikistan was felt with intensity up to IV in the area(s) of Tajikistan in Osh, Kyrgyzstan.
This epicenter is at the third node (120 degrees) from Venezuela and at the
seventh node (52 degrees) from Typhoon Bavi and may have been promoted by energy from those sources.
O: 09JUL2026 01:15:06 38.1N 74.1E MW=4.5 EMSC TAJIKISTAN
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
SUPER TYPHOON BAVI (09W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP BAVI 2026-07-09 00:00 UT 18.7N 129.0E 135 kts East of Northern Philippines
Super Typhoon Bavi (TD 09W) continued today east of northern Philippines with winds up to 135 kts. It is expected to track to the northwest over the next week. It os expected to make landfall in the Ryukyu Islands, Japan and Taiwan around July 10-11 where a moderate to strong earthquake may occur near that time. The antipode of today's location of Bavi is near 19S 51W over eastern Brazil and is not likely to see enhanced seismicity at this time as it is generally a seismic quiet zone.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 8, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
6640 0732 0741 0745 C1.2 (July 8, 2026) 8.0E-04
Honshu M 4.7 07:35 UT
6740 0940 0955 1001 C2.1 (July 8, 2026) 1.9E-03
Loyalty Is. M 5.8 09:50 UT
6750 1031 1042 1059 C1.0 (July 8, 2026) 1.7E-03
6760 1120 1125 1128 C1.0 (July 8, 2026) 5.1E-04
New Britain M 5.0 11:23 UT
Loyalty Is. M 5.2 11:42 UT
6820 1749 1756 1801 M1.5 (July 8, 2026) 6.3E-03
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active July 9-11. Solar M-flare chance: 40% X-class: 10% proton storm: 1%
AP Indicies: global: 12, high: 31, mid-latitude: 11, time of max k: 06:00-08:00 UT; Max k: 6 Global Kp 3.33 0600-0900, July 8; Sunspot Number: 81; Radio Flux: 116
July 8, 2026
Notable earthquakes and events:
The quiet conditions in global seismicity which accompanied the recent strong
geomagnetic storm ended today with a number of moderate to moderately large
earthquakes around the world - many of which were felt. The Hp30 index from GFZ
did not exceed 4 today.
A strong instantaneous excursion occurred today as recorded on the GOES-18 and GOES 19
satellite magnetometers. This occurred at 19:45 UT. An arcjet maneuver was
performed and satellite orbit of GOES 18 resumed normal operations by 07:20 UT.
As reported in previous issues of this summary, this excursion in the
measured geomagnetic field (perhaps an electromagnetic pulse) was accompanied
by a simultaneous earthquake of M 5.3, the largest in the world within hours
of this time in the area of Sunda Strait, Indonesia (also at 19:45 UT). Various
hypotheses may be presented explaining to some extent, the simultaneity
of these two phenomena. Readers will recall recent earthquakes of M 6.0-6.1
in the Gulf of California and then in the Ryukyu Islands, Japan also occurred
within a minute of a significant arcjet and geomagnetic excursion (see previous
summaries for details). The earthquake today in Sunda Strait occurred near local
solar midnight and was followed 10 minutes later by an M 4.6 in Kyrgyzstan within
minutes of local solar midnight.
NEIC reported the M 5.3 in Sunda Strait, Indonesia was felt near Labaun, Indonesia in the epicentral area.
EMSC reported moderate shaking in Indonesia at Biha and Serpong.
This epicenter is near the antipode of Venezuela and at the sixth node (60 degrees)
from the South Geomagnetic pole and Honshu, Japan and may have been promoted
by energy from those sources.
O: 07JUL2026 19:44:53 6.6S 105.1E MW=5.3 NEIC SUNDA STRAIT, INDONESIA
EMSC reported the earthquake Kyrgyzstan was felt in Uzbekistan at Yangiyer and Qirgiziston and in Kazakhstan at Almaty.
O: 07JUL2026 19:54:41 41.2N 72.6E MW=4.6 NEIC KYRGYZSTAN
A strong decrease in the geomagnetic field intensity at the GOES satellites
was also recorded starting at 18:10 UT on July 7, 2026. This geomagnetic fluctuation
was accompanied by an M 5.3 in Costa Rica and an M 4.5 in the Andreanof Islands,
Alaska at 18:12 UT and M 18:08 UT respectively. Costa Rica was within minutes
of local solar noon at the time of the earthquake there and it may have
been promoted by electromagnetic changes such as these.
EMSC reported the earthquake in Costa Rica was felt with moderate to strong intensity
in Santiago, Paquera, Carrillos, Alajuela, La Asuncion, San Felipe, Santo Domingo, Mercedes, Calle Blancos, Guadalupe, Tilaran, Curridabat, San Isdro and possibly in Manaca Norte, Panama.
O: 07JUL2026 18:11:32 9.7N 84.7W MW=5.3 NEIC COSTA RICA
O: 07JUL2026 18:07:41 52.5N 176.2W MW=4.5 NEIC ANDREANOF ISLANDS, ALASKA
The earthquake in Costa Rica followed several unusual earthquakes near local
solar noon including an M 4.7-4.9 in the Virgin Islands and an M 4.9 in the Drake Passage
about half an hour before the event in Costa Rica. The earthquake in the
Virgin Islands is the strongest event in the Virgin Islands since an M 4.9 on March 31, 2026.
At the time this summary noted:
"A moderate earthquake of M 5.0 was accompanied by a series of moderate foreshocks
and aftershocks north of Anguilla in the Virgin Islands today. While moderate
earthquakes in the Virgin Islands are not uncommon, this is an unusual earthquake.
The last earthquake within about 100 km of this epicenter with M>=5.0 was recorded
by NEIC as occurring on on June 1, 2009 also with M 5.0. as an aftershock of
an M 5.6 on March 2, 2006. At the time this summary noted:
"A moderately strong earthquake ocurred today in the region of the Leeward
and Virgin Islands on the northeast border between the Atlantic and
Caribbean tectonic plates. Data on the NEIC website indicates the earthquake
was felt with intensity III in Puerto Rico at Naguabo and Guaynabo and
at Saint Thomas, Virgin Islands. It was also felt in the Virgin Islands
at St. John and in Puerto Rico wat Carolina and generally within about
250 km of the epicenter. This is the strongest earthquake located in
the Leeward Islands (16-22N 60-70W) in nearly three years - since an M 5.7
occurred on June 30, 2003. ..." (March 2, 2006)
Today's event follows a series of moderate earthquakes in the area including
an M 5.2 on March 19, 2026 about 150 km southeast of today's epicenter. This
summary has followed this over the past week as further activity in the
Virgin Islands was expected at this time due to its antipodal location
with respect to TC Narelle. Fore example on March 29, it was noted:
"The series of light ot moderate earthquakes continued today in Puerto Rico and
the Virgin Islands with maximum of M 4.2 in the area of Saint Martin and the Bottom, Bonaire, Sainte Eustatius and Saba, Leeward Islands.
This is the strongest earthquake in this area since an M 4.4 on August 4, 2025.
The last event of significantly larger magnitude in the area was an M 5.0 on April 19, 2014. At
the time this summary noted:
"A pair of moderate earthquakes also hit the Caribbean today. The largest of these
was in the Leeward Islands (M 5.0-5.3) while an M 3.9-4.3 also occurred north
of this in the Virgin Islands. This area is still unstable and near a major
earthquake and these may be signs of this instability. Forecast 79446 had
expected both these events within about 50 km of the epicenters to occur
around April 19. The M 5.0 in the Leeward Islands near Anguilla is the strongest
in that area in nearly a year - since an M 5.3 on April 30, 2013.
Local News reported the earthquake of M 5.0 in the Leeward Islands was felt with moderate intensity in St. Kitts and Nevis about 50 km from the epicenter.
No damages or casualties were reported. NEIC reported this earthquake occurred in the Saint Martin Region, Leeward Islands with intensity II-III in
the Netherlands Antilles at Philippsburg and in the Netherlands Antilles at Simpson Bay and OPhillipsburg and
with intensity II in Maunabo, Puerto Rico." (April 20, 2014, March 31, 2026)
Today's epicenter in the Virgin Islands was exactly sub-solar (sub-solar latitude
on July 7 is 19.5 North latitude) on this date and occurred within an hour
or local solar noon marking it as an excellent example of a triggered
sub-solar earthquake.
This epicenter is at 141 degrees from Typhoon Bavi; and at the fifth node (72 degrees)
from the north geomagnetic pole and may have been promoted by energy from those sources.
O: 07JUL2026 17:25:36 19.5N 64.6W MW=4.7 NEIC VIRGIN ISLANDS
O: 07JUL2026 08:02:11 19.5N 64.3W MD=3.8 EMSC VIRGIN ISLANDS REGION
O: 07JUL2026 17:25:36 19.6N 64.6W mb=4.7 EMSC VIRGIN ISLANDS REGION
O: 08JUL2026 01:07:04 18.9N 64.6W MD=3.7 EMSC VIRGIN ISLANDS REGION
O: 07JUL2026 17:39:56 57.3S 66.9W MW=4.9 NEIC DRAKE PASSAGE
O: 07JUL2026 17:39:56 57.4S 66.9W MB=4.9 EMSC DRAKE PASSAGE
Another series of earthquakes today which were at the sub-solar latitude
occurred in Maharashtra, India. The sub-solar latitude on July 8 is 19.2
North latitude. The larger of these events occurred at 19.2N near local solar midnight,
another good example of sub-solar triggering of seismicity.
The last earthquake in Maharshtra, India with M>=4.2 occurred as an
M 4.5 on April 11, 2026 and before that two years ago on July 10, 2024. There
were no earthquakes of M>=4.2 within 200 km of this epicenter between 2001 and 2023.
Readers may note that the event in July, 2024 was also a sub-solar earthquake similar
to that that occurred today. At the time this summary noted:
"NEIC reported this earthquake of M 4.5 in India was felt with intensity up to V in the area(s) of India in Basmat.
EMSC reported moderate shaking in Idia at Mahaveer Society, Nanded, Hingoli. " (July 10, 2024)
This epicenter is at the fifth node (72 degrees) from the North Geomagnetic Pole; the sixth node
(60 degrees) from Honshu, Japan and the seventh node (51 degrees) from Typhoon
Bavi and may have been promoted by energy from those sources.
O: 08JUL2026 20:07:25 19.2N 76.9E MW=4.2 EMSC MAHARSHTRA, INDIA
O: 08JUL2026 21:53:10 19.5N 77.1E MW=4.1 EMSC MAHARSHTRA, INDIA
NEIC reported an earthquake of M 3.3 in Hawaii was felt with intensity up to II-III in the area(s) of Hawaii in Pahala, Naalehu, Waikoloa, Holualoa, Hawaii National Park, Volcano, Pepeekeo.
EMSC reported sudden shaking in Hawaiian Ocean View. Like the earthquakes
in the Virgin Islands and Maharshtra, India (see above) this event in Hawaii
is at today's sub-solar latitude (19.2 degrees north) and was probably
promoted by strong tidal and/or geomagnetic stresses which maximize
in vertical directions under these circumstances.
Hawaii is no stranger to sub-solar tectonic earthquakes in early July. For example
one of the strongest earthquake in Hawaii in recent years occurred on July 5, 2021
with M 5.2 and was also exactly sub-solar at 20.2 north latitude. earthquakes
of M>=3.5 have hit in Hawaii at sub-solar latitudes early July in each of
the past 10 years with the exception of 2025 indicating this is a powerful
triggering circumstance for earthquakes in Hawaii.
O: 08JUL2026 07:16:25 19.1N 155.4W MW=3.3 NEIC HAWAII
O: 08JUL2026 07:16:24 19.2N 155.4W ML=3.5 EMSC ISLAND OF HAWAII, HAWAII
NEIC reported an earthquake of M 4.7 in Central Peru was felt with intensity up to II-III in the area(s) of Central Peru near Santa Rosa.
O: 08JUL2026 05:00:32 10.7S 74.8W MW=4.7 NEIC CENTRAL PERU
NEIC reported an earthquake of M 4.4 in Crete, Greece was felt with intensity up to II-III in the area(s) of Crete, Greece in Ayia Marina, Platanos and Holimvari, Hania and in Ierapetra.
EMSC reported moderate shaking with a loud earthquake noise in Crete at Platanos, Kissamos, Kolympari, Tavronitis, Palaiochora, Maleme, Gerani, Agia Marina, Daratsos, Chania.
This event occurred within minutes of local solar midnight and may have been
promoted by tidal and/or geomagnetic stresses which maximize near this hour.
This epicenter is at 103 degrees from Antofagasta, Chile and may have been
promoted by energy from that source.
O: 07JUL2026 22:18:03 35.3N 23.4E MW=4.4 NEIC CRETE, GREECE
O: 07JUL2026 22:18:03 35.5N 23.5E MB=4.4 EMSC CRETE, GREECE
NEIC reported an earthquake of M 5.1 in Sichuan, China was felt with intensity up to II-III in the area(s) of Sichuan, China in Huayang and Chengdu.
EMSC reported strong shaking in Yanjing, China. Reports from China indicate
that these earthquakes in a series are causing minor damage and forcing
people to flee from their homes for fear of collapsing structures. The last
earthquake in northern Sichuan, China within about 200 km of today's events
with M>=5.1 occurred as a series starting with an M 5.8 on June 17, 2019.
At the time this summary noted:
"The strongest earthquake of the day was an M 5.8 in Southern Sichuan, China. NEIC reported intensity up to VI in Sichuan at Xunchang and Yibin and II-III in Luzhou, Leshan, Sichuan and in Chongqing at Chongqing and Beibei. Also felt in Zunyi, Guzhou and in Guiyang, China.
Two aftershocks of M 5.2 were felt. NEIC reported intensity II-III in Sichuan at Chengdu and in Chongqing, China.
At least 12 were killed in this earthquake which also injured more than 135 people.
A hotel and up to 73 houses collapsed in the earthquake. A hospital in Changning County was also damaged. Most of the deaths
were caused bu the structural collapse. Nearly 5000 were evacuated. Sections of highway
were closed or covered by landslides. The event occurred near local solar
midnight, a prime time for tidal triggering with the full moon which arrived today." (June 17, 2019)
Today's activity in Sichuan, China follows a pair of earthquakes of M 5.0 each
about 300 km north of today's epicenter which occurred on July 5, 2026.
At the time this summary noted:
"NEIC reported a series of earthquakes of M 5.0, 5.0, 4.6 in Sichuan, China was felt with intensity up to II-III in the area(s) of Sichuan, China in Jiancheng, Chengdu and Huayang." (July 5, 2026)
This epicenter is at 141 degrees from Venezuela; at the 12th node (30 degrees)
from Mindanao and the sixth node from the North Geomagnetic Pole and may have been promoted by energy from those sources,
O: 07JUL2026 22:22:13 28.7N 104.8E MB=4.6 EMSC EASTERN SICHUAN, CHINA
O: 07JUL2026 20:01:28 28.5N 104.7E ML=3.8 EMSC EASTERN SICHUAN, CHINA
O: 07JUL2026 22:12:30 28.6N 104.7E Mw=5.1 EMSC EASTERN SICHUAN, CHINA
O: 08JUL2026 02:08:49 28.6N 104.7E Mw=5.1 EMSC EASTERN SICHUAN, CHINA
O: 07JUL2026 22:12:29 28.6N 104.8E MW=5.1 NEIC SICHUAN, CHINA
O: 08JUL2026 02:08:49 28.6N 104.7E MW=5.1 NEIC SICHUAN, CHINA
NEIC reported an earthquake of M 3.6 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in with IV in Angwin, III in Calistoga, San Jose, Santa Rosa, Rohnert Park, Aptos, Sonoma, Sn Rafael, Suisun City, Ukiah, Windsor, Hidden Valley Lake, Nice, Oakland, Fairfield, Penngrove, San Francisco and Glenbrook, Nevada. Deer Park, Angwin, Saint Helena, Pope Valley and Napa.
NEIC reported an aftershock of M 2.6 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in Deer Park, Angwin, Saint Helena, Pope Valley and Napa.
These earthquakes occurred near local solar noon and may have been promoted
by tidal and/or geomagnetic stresses which maximize near this hour.
This epicenter is at the fourth node (90 degrees) from Typhoon Bavi; the seventh node
(51 degrees) from the north geomagnetic pole and 103 degrees from Mindanao
and may have been promoted by energy from those sources.
O: 07JUL2026 21:33:10 38.6N 122.4W MW=2.6 NEIC NORTHERN CALIFORNIA
O: 07JUL2026 21:33:10 38.6N 122.5W MD=2.4 EMSC NORTHERN CALIFORNIA
O: 07JUL2026 21:30:02 38.6N 122.4W MW=3.6 NEIC NORTHERN CALIFORNIA
O: 07JUL2026 21:30:02 38.6N 122.5W MW=3.4 EMSC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 4.9 in North Island, New Zealand was felt with intensity up to II-III in the area(s) of North Island, New Zealand in Gisborne and Whakatane Bay of Plenty.
GEONET reported the following data for this event:
O: 07JUL2026 20:33:16 37.1S 177.5E MB=5.8 GEONET 1024 people reported feeling this earthquake with 614 at weak intensity and 359 with light shaking and 47 with moderate intensity 4 with strong, 0 with severe and 0 with extreme intensity.
This epicenter is at the fifth node (72 degrees) from Typhoon Bavi and at the 10th node (36 degrees) from the South Geomagnetic Pole and may
have been promoted by constructive interference of energy from those sources.
O: 07JUL2026 20:33:15 37.2S 177.4E MW=4.9 NEIC NORTH ISLAND, NEW ZEALAND
O: 07JUL2026 20:33:15 37.2S 177.4E MW=5.0 EMSC OFF E. COAST OF N. ISLAND, N.Z
NEIC reported an earthquake of M 4.2 in Sumatra, Indonesia was felt with intensity up to II-III in the area(s) of Northern Sumatra, Indonesia in Binjai.
This epicenter is at the fifth node (72 degrees) from the South Geomagnetic Pole
and at the 10th node (36 degrees) from Typhoon Bavi and may have been
promoted by constructive interference of energy from those source.
O: 07JUL2026 15:36:07 3.0N 97.5E MW=4.2 NEIC SUMATRA, INDONESIA
O: 07JUL2026 15:36:07 2.9N 97.6E MB=4.2 EMSC NORTHERN SUMATRA, INDONESIA
NEIC reported an earthquake of M 4.5 in northeastern Venezuela was felt with intensity up to II-III in the area(s) of northeastern Venezuela near Yagyaraparo.
EMSC reported light shaking in Venezuela at Maturin and Carupano.
O: 07JUL2026 08:41:37 10.7N 62.6W MW=4.5 NEIC SUCRE, VENEZUELA
O: 07JUL2026 08:41:38 10.8N 62.7W MB=4.5 EMSC OFFSHORE SUCRE, VENEZUELA
NEIC reported a swarm of earthquakes of M 4.5-5.4 in the Reykjanes Ridge area of the north Atlantic.
This is a remote area south of Iceland and these events were not reported
felt. It is likely that these earthquakes are associated with volcanic
activity in this area of the Northern Mid-Atlantic Ridge promoted by
the geomagnetic storm of the past two days. They may also have been
promoted by tidal stresses with the full moon which was maximized
near this longitude. The last earthquake within about 250 km of this
epicenter in the Reykjanes Ridge with M>=5.3 occurred as an M 5.5 and M 5.9
on March 10, 2019 - the only such events since July, 2006 nearly 20 years ago.
At the time of the March, 2019 event this summary noted:
"A series of moderate to moderately strong earthquakes occurred today in the northern
Northern Mid-Atlantic Ridge in the Reykjanes area. The strongest of these was an
M 5.8 preceded by events of M 5.2 and 5.3. These events were not reported felt
in this remote area and were probably associated with volcanism on the Reykjanes Ridge.
The M 5.8 is the strongest earthquake within about 200 km of this epicenter
since an M 5.9 on September 10, 2017. No other such events have hit the area in the past 30 years." (March 10, 2019)
Like today's activity in the Reykjanes Ridge, the activity in March, 2019
followed a day after a strong geomagnetic storm. At the time this summary noted:
"The geomagnetic field saw active conditions today. The AP level was 24.
High latitude geomagnetic field saw minor storm conditions with AP at 36.
This is the strongest global geomagnetic storm since AP reached 35 on November 5, 2018.
At high latitudes A reached 40 on February 1. This storm is likely to promote
moderate to strong seismicity along the geomagnetic equator and to a lesser extent at high latitudes.
The storm reached maximum levels early on March 1 with KP 5 globally and KP 6 at high latitudes and would most likely
affect seismicity in the Caribbean and western south America where a moderate
to strong earthquake could occur in the next several days. The earthquake
of M 7.0 in Peru today on the geomagnetic equator occurred at the peak of this storm." (March 1-6, 2019)
When a similar swarm occurred 23 years ago on July 9, 2003 this summary
noted the relation to a strong geomagnetic storm as:
"The geomagnetic field was strongly disturbed levels today. A strong geomagnetic
storm began at about 03:00 UT on July 11 and has continued throughout the
day and through the first half of July 12 intensifying on the morning of
July 12. A global and regional seismic watch is being called on this basis" (July 9, 2003)
This activity is nearly antipodal to the South Geomagnetic Pole and at 34 degrees
from the north geomagnetic pole and may have been promoted by energy from those
sources associated with the recent geomagnetic storm.
O: 07JUL2026 08:30:56 59.5N 30.4W ML=5.0 NEIC REYKJANES RIDGE
NEIC reported an earthquake of M 4.7 in Svalbard and Jan Mayen was felt with intensity up to II-III in the area(s) of Svalbard and Jan Mayen near Olonkinbyen.
This series began with an M 3.5 at exactly local solar midnight and may
have been promoted by tidal and/or geomagnetic stresses which maximize near
this hour.
This epicenter is at 102-103 degrees from Sulawesi and Antofagasta, Chile
and at the fifth node (72 degrees) from Venezuela and my have been
promoted by energy from those sources.
O: 08JUL2026 00:22:31 71.9N 6.8W ML=3.5 NEIC JAN MAYEN ISLAND REGION
O: 08JUL2026 04:21:46 71.1N 7.1W MW=4.7 NEIC SVALBARD AND JAN MAYEN
O: 08JUL2026 04:32:57 71.1N 7.3W ML=3.3 EMSC JAN MAYEN ISLAND REGION
O: 08JUL2026 04:21:46 71.2N 7.2W mb=4.7 EMSC JAN MAYEN ISLAND REGION
O: 08JUL2026 07:32:58 71.3N 7.6W ML=2.1 EMSC JAN MAYEN ISLAND REGION
O: 08JUL2026 00:22:31 71.0N 6.8W ML=3.5 EMSC JAN MAYEN ISLAND REGION
EMSC reported an earthquake of M 4.7 in Tajikistan was felt with intensity up to IV in the area(s) of Tajikistan in Kazakshatan at Asyqata.
This earthquake may have been promoted by a C1.8 solar flare which was
in progress when it occurred. Data of this flare from SWPC follow:
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
6480 2240 2249 2253 C1.8 (July 7, 2026) 1.0E-03
Tajikistan M 4.9 22:42 UT
This epicenter is at the sixth node from Mindanao and Sulawesi and 51.4 degrees
(Node 7) from the North Geomagnetic Pole and may have been promoted by energy from those sources.
O: 07JUL2026 22:42:37 39.1N 71.6E ML=4.9 EMSC TAJIKISTAN
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
SUPER TYPHOON BAVI (09W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP BAVI 2026-07-08 00:00 UT 17.6N 130.8E 140 kts West of Guam
Super Typhoon Bavi (TD 09W) continued today west of Guam with winds up to 140 kts. It is expected to track to the northwest over the next week. Seismicity in Guam and the Caroline and Mariana Islands is sensitive to strong Typhoons. A moderate to large earthquake in this area could accompany Bavi as it moves to the west. The antipode of today's location of Bavi is near 18S 50W over eastern Brazil and is not likely to see enhanced seismicity at this time as it is generally a seismic quiet zone.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 7, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
6380 0332 0340 0346 C1.8 (July 7, 2026) 1.5E-03
6410 1202 1212 1217 C1.6 (July 7, 2026) 1.4E-03
6430 1409 1419 1422 M4.0 (July 7, 2026) 1.0E-02
Talaud M 4.5 14:21 UT
6480 2240 2249 2253 C1.8 (July 7, 2026) 1.0E-03
Tajikistan M 4.9 22:42 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: quiet July 8 active July 9-10. Solar M-flare chance: 45% X-class: 10% proton storm: 1%
AP Indicies: global: 4, high: 3, mid-latitude: 4, time of max k: 16:00-18:00 UT; Max k: 2 Global Kp 2.00 2200-2400, July 7; Sunspot Number: 50; Radio Flux: 110
July 7, 2026
Notable earthquakes and events:
Conditions in the ionosphere of the earth returned to background today after
two days of a G3 geomagnetic storm. Proton and electron flux at satellite
altitudes were slightly above normal with electron flux exceeding the
alert level throughout much of the day. This level of activity following
the geomagnetic storm suggests that a return to active seismic conditions
is due in the next two days. Earthquakes today in the Drake Passage (at 60S
latitude - M 5.8) and a swarm in the Reykjanes Ridge (at 60N latitude) in the
northern Atlantic were probably promoted by the geomagnetic storm as geomagnetic
effects from such storms often concentrate at high latitudes near the
geomagnetic poles. The swarm in the Reykjanes Ridge began at the peak of that storm and continued
at active levels today. GOES magnetometers showed no unusual activity throughout
July 6, 2026. A minor arcjet correction to the GOES-19 satellite around 03:30 UT
does not seem to be related to a strong spike in geomagnetic field readings.
The Hp30 index from GFZ and the Kp index from NOAA did not exceed 3 throughout
the day. There were no M- or X- class solar flares listed by SWPC. The only
significant oceanic storm active at this time is Super-Typhoon Bavi - a storm
northwest of Guam at this time. Seismicity in the region of Guam, the Caroline
Islands and the Mariana Islands could still be enhanced with this storm
in the region. No strong earthquakes were recorded today but several oceanic
events in the Indian and Atlantic Oceans could be of interest to readers of this summary.
NEIC reported a swarm of earthquakes of M 4.5-5.4 in the Reykjanes Ridge area of the north Atlantic.
This is a remote area south of Iceland and these events were not reported
felt. It is likely that these earthquakes are associated with volcanic
activity in this area of the Northern Mid-Atlantic Ridge promoted by
the geomagnetic storm of the past two days. They may also have been
promoted by tidal stresses with the full moon which was maximized
near this longitude. The last earthquake within about 250 km of this
epicenter in the Reykjanes Ridge with M>=5.3 occurred as an M 5.5 and M 5.9
on March 10, 2019 - the only such events since July, 2006 nearly 20 years ago.
At the time of the March, 2019 event this summary noted:
"A series of moderate to moderately strong earthquakes occurred today in the northern
Northern Mid-Atlantic Ridge in the Reykjanes area. The strongest of these was an
M 5.8 preceded by events of M 5.2 and 5.3. These events were not reported felt
in this remote area and were probably associated with volcanism on the Reykjanes Ridge.
The M 5.8 is the strongest earthquake within about 200 km of this epicenter
since an M 5.9 on September 10, 2017. No other such events have hit the area in the past 30 years." (March 10, 2019)
Like today's activity in the Reykjanes Ridge, the activity in March, 2019
followed a day after a strong geomagnetic storm. At the time this summary noted:
"The geomagnetic field saw active conditions today. The AP level was 24.
High latitude geomagnetic field saw minor storm conditions with AP at 36.
This is the strongest global geomagnetic storm since AP reached 35 on November 5, 2018.
At high latitudes A reached 40 on February 1. This storm is likely to promote
moderate to strong seismicity along the geomagnetic equator and to a lesser extent at high latitudes.
The storm reached maximum levels early on March 1 with KP 5 globally and KP 6 at high latitudes and would most likely
affect seismicity in the Caribbean and western south America where a moderate
to strong earthquake could occur in the next several days. The earthquake
of M 7.0 in Peru today on the geomagnetic equator occurred at the peak of this storm." (March 1-6, 2019)
When a similar swarm occurred 23 years ago on July 9, 2003 this summary
noted the relation to a strong geomagnetic storm as:
"The geomagnetic field was strongely disturbed levels today. A strong geomagnetic
storm began at about 03:00 UT on July 11 and has continued throughout the
day and through the first half of July 12 intensifying on the morning of
July 12. A global and regional seismic watch is being called on this basis" (July 9, 2003)
This activity is nearly antipodal to the South Geomagnetic Pole and at 34 degrees
from the north geomagnetic pole and may have been promoted by energy from those
sources associated with the recent geomagnetic storm.
O: 07JUL2026 08:30:56 59.5N 30.4W ML=5.0 NEIC REYKJANES RIDGE
O: 07JUL2026 05:55:40 59.5N 30.3W ML=5.3 NEIC REYKJANES RIDGE
O: 07JUL2026 05:00:43 59.5N 30.3W ML=5.0 NEIC REYKJANES RIDGE
O: 07JUL2026 04:56:02 59.4N 30.2W ML=4.4 NEIC REYKJANES RIDGE
The strongest earthquake of the day in the world was an M 5.8 in the Drake
Passage near Ushuaia, Argentina. NEIC reported it may have been felt with intensity
up to IV in the epicentral area. It is likely that this event in the
Drake Passage is related to the subsequent events in the Reykhanes Ridge
as they are separated by exactly 120.0 degrees (node 3) at nearly equal distances
from the equator. The last earthquake of M>=5.8 within about 200 km of today's
event in the Drake Passage occurred as an M 7.4 and M 6.4 aftershocks on May 2, 2025 and prior to that as a
pair of evnts on October 29, 2018 of M 6.3 and M 5.8. At the time of the May, 2025
event this summary remarked on the coincidence of this event with a strong
geomagnetic storm as:
"A severe geomagnetic storm occurred today with maximum high latitude KP reaching
7 around 12:00-14:00 UT. The high latitude A for the day was 68. This is
the strongest geomagnetic storm at high latitudes since A reach 113 on January 1, 2025.
The sudden commencement storms of this type can trigger seismic activity
centered at nodal distances from the South and North Geomagnetic poles where
charged particles interact with the ionosphere and earth. So it should not be
surprising to frequent readers of this summary that a magnitude M 7.4 earthquake
occurred at the high latitude of 55S at the height of this geomagnetic storm
at a distance of 60.0 degrees (node 6) from the South Geomagnetic Pole.
The major earthquake of M 7.4 today in the Drake Passage south of South America
was followed by a series of moderate aftershocks. This earthquake was reported by
NEIC to have been felt with intensity up to V in Ushuaia Tierra del Fuego, Argentina and II in Rio Gallegos, Santa Crus, Argentina and in Chile at Punta Arenas, Magellanes and Quilpue, Valparaiso.
An aftershock of M 6.4 was felt in the same area.
reported felt in this remote epicentral area. A tsunami was possible but
only record of a regional tsunami was recorded at Vernadsky, Antarctica at 65S 64W with maximum height 0,14m or 0.4 ft.
This earthquake occurred near local solar noon and may have been promoted by a strong geomagnetic storm which reach KP
7 about the time of this event. This epicenter is located at 60 degrees
from the South Geomagnetic Pole and could have been affected by storm
particles affecting that pole. It is also at 144 degrees from the M 7.7
in Myanmar of March 28 and may have been promoted by energy from that source.
The only earthquake of M>=7 in recorded history within about 500 km of this
epicenter was an M 7.0 on June 15, 1970. Today's earthquake is therefore
a major significant event being the largest ever recorded in this region." (May 2, 2025)
Today's epicenter in the Drake Passage is located at the sixth node (60 degrees)
from the South Geomagnetic Pole and at 149 degrees from the North Geomagnetic
Pole and may have been promoted by energy associated with the recent geomagnetic storm from those sources.
O: 07JUL2026 01:26:45 57.3S 66.8W ML=5.8 NEIC DRAKE PASSAGE
NEIC reported an earthquake of M 2.5 in Oklahoma was felt with intensity up to II-III in the area(s) of Oklahoma in Prague.
O: 07JUL2026 00:35:06 35.5N 96.7W ML=2.5 NEIC OKLAHOMA
NEIC reported an earthquake of M 4.9 in Mauritius was felt with intensity up to II-III in the area(s) of Mauritius near Port Mathurin.
This epicenter is located at 108 degrees from the North Geomagnetic Pole
and may have been promoted by energy from that source.
O: 06JUL2026 20:25:12 18.3S 64.8E ML=4.9 NEIC MAURITIUS
NEIC reported an earthquake of M 4.9 in the southwest Indian Ridge was not felt in this remote area.
This epicenter is at 103 degrees from Super-typhoon Bavi and may have
been promoted by energy from that source.
O: 06JUL2026 16:50:10 38.4S 48.1E ML=4.9 NEIC SOUTHWEST INDIAN RIDGE
NEIC reported an earthquake of M 5.1 in Valparaiso, Chile was felt with intensity up to II-III in the area(s) of Valparaiso, Chile with IV in Valparaiso at Quillota and III in Vina del Mar, Calera, Villa Alemana, Santiago, Puento Alto, Paine, Lampa, Buin and Penaflor.
EMSC reported moderate to strong shaking in Quintero, Vina del Mar, Hacienda La Calera, Quillota, Valparaiso, Quilpue, Villa Alemana, Llaillay, Lo Prado, Santiago, Providencia, Puente Alto, and in Las Heras, Argentina.
This epicenter is at 144 degrees from Super-Typhoon Bavi and may have
been promoted by energy from that source.
O: 06JUL2026 16:15:51 32.5S 71.8W ML=5.1 NEIC VALPARAISO, CHILE
O: 06JUL2026 16:18:10 32.6S 71.7W ML=4.8 NEIC VALPARAISO, CHILE
NEIC reported an earthquake of M 3.2 in the Channel Islands south of Los Angeles, California was felt with intensity up to II-III in the area(s) of the Channel Islands south of Los Angeles, California in Los Angeles, Fullerton, Santa Monica, Avalon, Irvine, Redondo Beach, Long Beach.
O: 06JUL2026 12:48:02 33.4N 118.3W ML=3.2 NEIC CHANNEL ISLANDS, CALIFORNIA
NEIC reported an earthquake of M 4.6 in northern Honshu, Japan was felt with intensity up to II-III in the area(s) of northern Honshu, Japan in Misawa, Aomori.
O: 06JUL2026 11:29:36 40.4N 141.8E ML=4.6 NEIC OFF EASTERN JAPAN
NEIC reported earthquakes of M 3.8 and M 3.8 in Southern Colorado were felt with intensity up to II-III in the area(s) of Southern Colorado in Trinidad, Kim and Weston and in Raton, New Mexico.
O: 06JUL2026 09:31:40 36.9N 104.8W ML=3.8 NEIC SOUTHERN COLORADO
O: 06JUL2026 09:21:54 36.8N 104.8W ML=3.8 NEIC SOUTHERN COLORADO
NEIC reported earthquakes of M 5.8 and M 5.4 in Mindanao, Philippines were felt with intensity up to II-III in the area(s) of Mindanao, Philippines in Silway, Katangawan, Manado, Padada, Buayan.
O: 06JUL2026 08:41:38 4.9N 125.1E ML=5.4 NEIC MINDANAO, PHILIPPINES
O: 06JUL2026 08:11:11 5.0N 125.4E ML=5.8 NEIC MINDANAO, PHILIPPINES
NEIC reported an earthquake of M 3.4 in Northern Chile was felt with intensity up to II-III in the area(s) of Tarapaca, Chile in Iquique.
O: 06JUL2026 07:29:50 19.7S 70.2W ML=3.4 NEIC TARAPACA, CHILE
EMSC reported earthquakes of M 4.2 and M 3.9 in Bio-Bio, Chile were felt with intensity up to IV in the area(s) of Bio-Bio, Chile at Coronel, Concepcion.
This epicenter is at 144 degrees from Super Typhoon Bavi and Mindanao and
may have been promoted by constructive energy interference from those sources.
O: 06JUL2026 12:43:14 37.0S 73.6W ML=4.2 EMSC BIO-BIO, CHILE
O: 06JUL2026 12:58:14 37.0S 73.6W ML=3.9 EMSC BIO-BIO, CHILE
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
SUPER TYPHOON BAVI (09W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP BAVI 2026-07-07 00:00 UT 16.5N 138.4E 150 kts Guam
Super Typhoon Bavi (TD 09W) continued today west of Guam with winds up to 150 kts. It is expected to track to the northwest over the next week. Seismicity in Guam and the Caroline and Mariana Islands is sensitive to strong Typhoons. A moderate to large earthquake in this area could accompany Bavi as it moves to the west. The antipode of today's location of Bavi is near 16S 42W near eastern Brazil and is not likely to see enhanced seismicity at this time as it is generally a seismic quiet zone.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 6, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
6230 0034 0044 0049 C5.9 (July 6, 2026) 3.9E-03
Oaxaca M 4/0 00:45 UT
6250 0157 0221 0234 C9.6 (July 6, 2026) 1.6E-02
Fiji M 4.4 02:21 UT
N of New Zealand M 4.0 02:23 UT
Costa Rica M 4.7 02:37 UT
6270 0455 0511 0530 C6.1 (July 6, 2026) 1.1E-02
Southern Alaska M 4.0 05:36 UT
6290 0639 0748 0916 C7.2 (July 6, 2026) 4.9E-02
6340 1825 1840 1853 C3.8 (July 6, 2026) 6.2E-03
Sulawesi M 4.4 18:47 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: quiet July 7-8 active July 9. Solar M-flare chance: 55% X-class: 10% proton storm: 5%
AP Indicies: global: 7, high: 10, mid-latitude: 6, time of max k: 13:00-16:00 UT; Max k: 4 Global Kp 2.67 0000-0300, July 6; Sunspot Number: 85; Radio Flux: 125
July 6, 2026
Notable earthquakes and events:
The geomagnetic storm of July 4 sputtered to an end today. Enhanced global
seismicity is expected to begin in the next two days. Super-Typhoon Bavi
is making landfall near Guam today and could enhance regional seismicity
in the area of the southern Mariana Islands in the next several days
as it passes through the region. Although global seismicity was quiet
today the area of Tonga and Fiji and the IDL continued to see enhanced
seismicity and it did on July 4. This may have been promoted by the X1.1
solar flare late on July 4.
The strongest earthquake of the day was an M 5.8 in the Fiji Islands. It was not reported
felt in this epicentral area but NEIC reported possible shaking near Levuka, Fiji.
O: 05JUL2026 14:22:26 20.0S 179.0W ML=5.8 NEIC FIJI ISLANDS REGION
NEIC reported earthquakes of M 5.8 and M 5.4 in Mindanao, Philippines were felt with intensity up to II-III in the area(s) of Mindanao, Philippines in Silway, Katangawan, Manado, Padada, Buayan.
O: 06JUL2026 08:41:38 4.9N 125.1E ML=5.4 NEIC MINDANAO, PHILIPPINES
O: 06JUL2026 08:11:11 5.0N 125.4E ML=5.8 NEIC MINDANAO, PHILIPPINES
NEIC reported an earthquake of M 4.0 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaska in Clam Gulch, Honer, Anchor Point, Anchorage, Kenai and Ninilchik.
O: 06JUL2026 05:36:22 60.0N 152.5W ML=4.0 NEIC SOUTHERN ALASKA
NEIC reported an earthquake of M 3.5 in New Mexico was felt with intensity up to II-III in the area(s) of New Mexico at Tierra Amarilla.
O: 05JUL2026 16:37:28 36.7N 106.8W ML=3.5 NEIC NEW MEXICO
NEIC reported a series of earthquakes of M 5.0, 5.0, 4.6 in Sichuan, China was felt with intensity up to II-III in the area(s) of Sichuan, China in Jiancheng, Chengdu and Huayang.
O: 05JUL2026 15:30:13 31.6N 104.1E ML=5.0 NEIC SICHUAN, CHINA
O: 05JUL2026 15:20:13 31.6N 104.1E ML=4.6 NEIC SICHUAN, CHINA
O: 05JUL2026 15:03:27 31.5N 104.1E ML=5.0 NEIC SICHUAN, CHINA
NEIC reported earthquakes of M 3.2 and M 3.0 in Central California were felt with intensity up to II-III in the area(s) of Central California in San Juan Bautista, Hollister, Aromas, Salinas, Watsonville, Salinas, San Francisco, Monterey, Gilroy and Mill Valley.
O: 05JUL2026 14:45:06 36.9N 121.6W ML=3.2 NEIC CENTRAL CALIFORNIA
O: 05JUL2026 14:04:47 36.9N 121.4W ML=3.0 NEIC CENTRAL CALIFORNIA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
SUPER TYPHOON BAVI (09W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP BAVI 2026-07-06 00:00 UT 14.9N 144.0E 175 kts Guam
Super Typhoon Bavi (TD 09W) continued today north of Guam with winds up to 175 kts. It is expected to track to the northwest over the next week passing over Guam as a major typhoon with winds up to 180 kts on or about July 4-5, 2026. Major damage is possible in Guam at that time. Seismicity in Guam is sensitive to strong Typhoons. It is likely that a moderate to large earthquake near Guam will accompany the landfall of Bavi in Guam within several days. The antipode of today's location of Bavi is near 15S 36W near the mid-Atlantic ridge at 12S 30W where some enhanced seismicity is possible at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 5, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
5750 0024 0031 0036 M1.3 (July 5, 2026) 6.7E-03
5760 0109 0121 0130 C8.3 (July 5, 2026) 8.1E-03
5780 0316 0324 0332 C4.1 (July 5, 2026) 3.8E-03
5790 0419 0432 0439 M1.3 (July 5, 2026) 1.0E-02
5800 0441 0447 0452 M1.0 (July 5, 2026) 7.0E-03
5830 0521 0539 0549 M2.7 (July 5, 2026) 3.0E-02
Greenland Sea M 4.5 05:51 UT
5840 0610 0619 0624 C7.8 (July 5, 2026) 5.9E-03
5870 0711 0715 0717 C7.7 (July 5, 2026) 2.4E-03
5880 0721 0726 0731 C9.9 (July 5, 2026) 4.6E-03
5900 0820 0826 0831 C4.2 (July 5, 2026) 2.6E-03
Oaxaca M 4.0 08:20 UT
5920 0849 0859 0904 C5.7 (July 5, 2026) 4.4E-03
5980 1042 1053 1056 C5.2 (July 5, 2026) 6.4E-03
6000 1056 1100 1102 M1.4 (July 5, 2026) 4.8E-03
6010 1104 1110 1130 M1.0 (July 5, 2026) 1.9E-02
6020 1153 1201 1208 C9.5 (July 5, 2026) 6.8E-03
Coquimbo, M 4.5 11:57 UT
6030 1252 1258 1311 C8.1 (July 5, 2026) 7.4E-03
6060 1417 1423 1428 C4.1 (July 5, 2026) 3.7E-03
Fiji M 5.8 14:22 UT
Coquimbo, M 5.0 14:22 UT
6080 1505 1520 1533 C6.9 (July 5, 2026) 9.6E-03
Kuril Is. M 4.5 15:06 UT
Sichuan M 5.0 15:04 UT M 4.6 15:20 UT M 5.0 15:30 UT
6110 1641 1645 1648 M1.4 (July 5, 2026) 7.2E-03
New Mexico M 3.4 16:38 UT
Molucca M 4.0 16:39 UT
6120 1735 1740 1750 C5.0 (July 5, 2026) 4.7E-03
6130 1751 1757 1802 M5.3 (July 5, 2026) 2.1E-02
6150 1856 1907 1911 M1.4 (July 5, 2026) 9.1E-03
New Guinea M 4.6 19:10 UT
Taiwan M 4.3 19:11 UT
6180 2007 2017 2023 C7.3 (July 5, 2026) 5.8E-03
New Guinea M 2.9 20:07 UT M 4.2 20:26 UT
Oaxaca M 4.0 20:15 UT
6200 2114 2122 2138 M1.0 (July 5, 2026) 1.2E-02
6220 2138 2142 2146 C9.5 (July 5, 2026) 5.0E-03
Oaxaca M 3.5 21:37 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active July 6 quiet July 7-8. Solar M-flare chance: 75% X-class: 20% proton storm: 20%
AP Indicies: global: 17, high: 31, mid-latitude: 19, time of max k: 10:00-13:00 UT; Max k: 6 Global Kp 4.00 1000-1300, July 5; Sunspot Number: 116; Radio Flux: 139
July 5, 2026
Notable earthquakes and events:
A strong geomagnetic storm hit early on the UT morning of July 4. At this writing the kp value
reached 7.33 during the hours from 03:00-06:00 UT. This is a G2-G3 storm
and is capable of disrupting global communications. Strong geomagnetic storms tend to suppress global seismicity except at the onset of
the storm. This dampening of seismicity is probably due to the disruptive
effect of the storm on ionospheric ring currents which induce telluric currents
in areas beneath them in the earth. When the storm subsides and these
electric currents resume, seicmicity can increase considerably. Storms such as this can also bring
enhanced seismicity at the onset or in areas near local solar noon at the
sudden commencement. The planetary A-index reached 7.33 (Ho30 at 8+) around
03:00-06:00 UT. The last time the plantary A index was 75 or higher was March 22, 2026 when
it reached 75 but the last with higher a-index occurred on January 20 when
the A-index as a massive 143 (G5 geomagnetic storm). A proton storm at energy levels >= 10MeV was reported at GOES-18 starting about 19:30 UT
on July 3 and continued into July 5. A strong enhancement of the geomagnetic
field strength at both GOES 18 and 19 satellites occurred starting about 04:30
on July 4. The sudden commencement of this geomagnetic storm appears to have
occurred about 00:00 on July 4. longitudes at local solar noon at this hour
include Tonga/Fiji/New Zealand and the central Aleutians in the north. These
area the most likely longitudes to see seismic enhancement with this storm.
But a sudden decline in field strength occurred starting about 01:30 and lasted
through 02:15 UT on both satellite magnetometers on July 4, 2026. The storm reached maximum
planetary Kp levels of 8 (Hp30, GFZ) at 05:00-05:30 UT after reaching 6.33
at 02:00-02:30 UT.
A strong X1.3 (#5640) solar flare began about 20:25 and peaked at 20:41 UT on July 4.
This flare was accompanied by a M 4.8 in Southern Peru near local solar noon
an event that was probably triggered by SFE from this flare as the epicenter
of this earthquake lies on the geomagnetic equator where SFE could be
concentrated. Previous X1.0-X1.1 flares have occurred recently on June 30, (X1.1 #3630)
and June 2, 2026 (X1.0 #7290). Data for today's flare from SWPC follow.
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
5640 2025 2041 2047 X1.3 (July 4, 2026) 5.0E-02 *
Southern Peru M 4.7 20:25 UT
A strong enhancement in the geomagnetic field strength was measured by GOES 18 and 19
magnetometers beginning around 19:00 and peaking around 20:15 UT on July 4, 2026
This followed a strong excursion of the field strength from about 13:00 UT to 17:45 UT
on July 4.
The earthquake in southern Peru is also antipodal with in about 100 km to
the landfall position of Tropical Storm Maysak which occurred yesterday.
At the time this summary had expected the event in Peru as:
"TS MAYSAK 2026-07-03 00:00 UT 17.6N 109.7E 45 kts Southeast Asia
TS Maysak (TD 10W) continued today and made landfall off Vietnam with winds up to 45 kts. It is expected to track to the northwest over the next several days with winds up to 50 kts on or about July 4, 2026 making landfall near Hanoi, Vietnam. Some coastal damage is possible in Vietnam at that time. It is possible that a moderate earthquake near Laos or Vietnam or Sichuan, China will accompany landfall within several days. The antipode of today's location of Maysak is near 18S 71W in southern Peru where moderately enhanced seismic activity is possible at this time." (July 3, 2026)
O: 04JUL2026 20:24:48 16.7S 73.6W ML=4.7 NEIC SOUTHERN PERU
An earlier M 4.4 in Tarapaca, Chile today occurred with the passage of TS Maysak
over the antipode as noted in the previous issues of this summary:
"TS MAYSAK 2026-07-04 00:00 UT 20.6N 107.8E 55 kts Southeast Asia
TS Maysak (TD 10W) continued today and made landfall off Vietnam with winds up to 55 kts. It is expected to track to the northwest over the next several days with winds up to 55 kts on or about July 4, 2026 making landfall near Hanoi, Vietnam. Some coastal damage is possible in Vietnam at that time. It is possible that a moderate earthquake near Laos or Vietnam or Sichuan, China will accompany landfall within several days. The antipode of today's location of Maysak is near 20S 72W in southern Peru and northern Chile near Tarapaca where moderately enhanced seismic activity is possible at this time." (July 4, 2026)
EMSC reported this earthquake was felt lightly in Iquique, Chile.
O: 06JUL2026 07:29:49 19.7S 70.2W ML=3.6 EMSC TARAPACA, CHILE
A strong eruption of Mt. Etna occurred with the onset of the geomagnetic
storm and may have been promoted by it. INGV in their latest ETNA bulletin
indicated this eruption began at 05:45 UT and intensified with an eruptive cloud around 06:45 UT.
This eruption may have been triggered by SFE associated with flare
5290 (C9.5) which began a minute before the eruption began.
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
5290 0544 0552 0559 C9.5 (July 4, 2026) 8.4E-03
Tonga M 4.3 05:46 UT
Etna eruption 05:45 UT
NEIC reported an earthquake of M 3.2 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaska in Anchorage.
O: 05JUL2026 04:00:31 61.4N 150.3W ML=3.2 NEIC SOUTHERN ALASKA
NEIC reported an earthquake of M 4.5 in Mariana Islands was felt with intensity up to II-III in the area(s) of Mariana Islands in the Pagan Region.
This event may have been promoted by the Super Typhoon Bavi which is south
of this epicenter at the time of this event as noted in this summary:
"Super Typhoon Bavi (TD 09W) continued today north of Guam with winds up to 175 kts. It is expected to track to the northwest over the next week passing over Guam as a major typhoon with winds up to 180 kts on or about July 4-5, 2026. Major damage is possible in Guam at that time. Seismicity in Guam is sensitive to strong Typhoons. It is likely that a moderate to large earthquake near Guam will accompany the landfall of Bavi in Guam within several days. The antipode of today's location of Bavi is near 14S 30W near the mid-Atlantic ridge at 12S 30W where some enhanced seismicity is possible at this time." (July 5, 2026)
O: 04JUL2026 22:12:53 18.9N 145.8E ML=4.5 NEIC NORTHERN MARIANA ISLANDS
EMSC reported earthquakes of M 5.0 and M 5.0 in Coquimbo, Chile were felt with intensity up to IV in the area(s) of Coquimbo, Chile in La Serena, Coquimbo, Vicuna, Copiapo.
O: 05JUL2026 15:53:34 29.2S 71.9W ML=5.0 EMSC COQUIMBO, CHILE
O: 05JUL2026 14:42:05 29.3S 71.9W ML=5.0 EMSC COQUIMBO, CHILE
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM MAYSAK (DEPRESSION 10W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS MAYSAK 2026-07-05 00:00 UT 20.6N 109.0E 55 kts Southeast Asia
TS Maysak (TD 10W) continued today and made landfall off Vietnam with winds up to 55 kts. It is expected to track to the northwest over the next several days with winds up to 55 kts on or about July 5, 2026 making landfall near Hanoi, Vietnam. Some coastal damage is possible in Vietnam at that time. It is possible that a moderate earthquake near Laos or Vietnam or Sichuan, China will accompany landfall within several days. The antipode of today's location of Maysak is near 20S 71W in southern Peru and northern Chile near Tarapaca where moderately enhanced seismic activity is possible at this time.
SUPER TYPHOON BAVI (09W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP BAVI 2026-07-05 00:00 UT 13.5N 147.8E 175 kts East of Guam
Super Typhoon Bavi (TD 09W) continued today north of Guam with winds up to 175 kts. It is expected to track to the northwest over the next week passing over Guam as a major typhoon with winds up to 180 kts on or about July 4-5, 2026. Major damage is possible in Guam at that time. Seismicity in Guam is sensitive to strong Typhoons. It is likely that a moderate to large earthquake near Guam will accompany the landfall of Bavi in Guam within several days. The antipode of today's location of Bavi is near 14S 30W near the mid-Atlantic ridge at 12S 30W where some enhanced seismicity is possible at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 4, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
5150 0013 0023 0032 M2.3 (July 4, 2026) 1.8E-02
5190 0059 0113 0121 M2.1 (July 4, 2026) 2.0E-02
5200 0152 0201 0208 M1.2 (July 4, 2026) 1.1E-02
5240 0321 0332 0340 M3.7 (July 4, 2026) 2.6E-02
5250 0341 0342 0343 M4.0 (July 4, 2026) 6.9E-03
5280 0504 0515 0522 M1.3 (July 4, 2026) 1.1E-02
Izu Is. M 4.8 05:04 UT
5290 0540 0552 0559 C9.5 (July 4, 2026) 8.4E-03 *
Tonga M 4.3 05:46 UT
Etna eruption 05:40 UT
5300 0612 0620 0635 C7.4 (July 4, 2026) 1.0E-02
5330 0726 0742 0748 C5.3 (July 4, 2026) 6.9E-03
Azores M 3.9 07:35 UT
New Guinea M 5.1 07:50 UT
5380 0748 0807 0814 M1.8 (July 4, 2026) 1.7E-02
New Guinea M 5.1 07:50 UT
5390 0841 0852 0856 M1.0 (July 4, 2026) 7.3E-03
Mindanao M 4.9 08:53 UT
New Guinea M 5.1 08:55 UT
Halmahera M 5.0 09:02 UT
5450 1104 1112 1119 M3.2 (July 4, 2026) 2.1E-02
5510 1341 1351 1358 M3.2 (July 4, 2026) 2.1E-02
5520 1426 1430 1435 C8.3 (July 4, 2026) 6.0E-03
5740 1435 1438 1441 C8.5 (July 4, 2026) 3.9E-03
5540 1526 1534 1550 C8.0 (July 4, 2026) 1.1E-02
Reykjanes Ridge M 4.4 15:16 UT
Sicily, Italy M 3.8 15:46 UT
Washington M 2.3 15:39 UT
5560 1602 1606 1611 M1.1 (July 4, 2026) 5.4E-03
Coast of Central America M 4.6 16:07 UT
5580 1656 1702 1704 C7.5 (July 4, 2026) 3.6E-03
Izu Is. M 4.6 16:57 UT M 4.7 17:03 UT
Etha, Italy M 2.7 16:53 UT
5610 1836 1848 1903 M1.9 (July 4, 2026) 2.1E-02
Tarapaca M 4.4 18L38 UT
5620 1923 1936 1940 M1.5 (July 4, 2026) 1.1E-02
5640 2025 2041 2047 X1.3 (July 4, 2026) 5.0E-02 *
Southern Peru M 4.7 20:25 UT
5690 2216 2224 2229 M1.1 (July 4, 2026) 8.5E-03
Fiji M 4.5 22:26 UT
North Is. N.Z, M 4.3 22:29 UT
5710 2332 2341 2344 C9.3 (July 4, 2026) 5.5E-03
5720 2346 2348 2353 M1.0 (July 4, 2026) 4.3E-03
South of Fiji M 4.5 23:51 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: minor storms July 5 active July 6 quiet July 7. Solar M-flare chance: 70% X-class: 20% proton storm: 20%
AP Indicies: global: 75, high: 53, mid-latitude: 40, time of max k: 13:00-18:00 UT; Max k: 6 Global Kp 7.33 0300-0600, July 4; Sunspot Number: 97; Radio Flux: 161
July 4, 2026
Notable earthquakes and events:
A strong geomagnetic storm hit early on the UT morning of July 4. At this writing the kp value
reached 7.33 during the hours from 03:00-06:00 UT. This is a G2-G3 storm
and is capable of disrupting global communications. It could also bring
enhanced seismicity at the onset or in areas near local solar noon at the
sudden commencement.
A proton storm at energy levels >= 10MeV was reported at GOES-18 starting about 19:30 UT
on July 3 and continued into July 4. A strong enhancement of the geomagnetic
field strength at both GOES 18 and 19 satellites occurred starting about 04:30
on July 4. This is probably the sudden commencement of this geomagnetic storm.
But a sudden decline in field strength occurred starting about 01:30 and lasting
through 02:15 UT on both satellite magnetometers. The storm reached maximum
planetary Kp levels of 8 (Hp30, GFZ) at 05:00-05:30 UT after reaching 6.33
at 02:00-02:30 UT.
Otherwise it was a relatively quiet day in global seismicity. No earthquakes
of M>=5.5 were recorded and no unusual or damaging earthquakes occurred today.
NEIC reported an earthquake of M 3.8 in Southeastern Alaska was felt with intensity up to II-III in the area(s) of Southeastern Alaska near Port Alexander.
O: 04JUL2026 03:12:36 56.0N 135.6W ML=3.8 NEIC SOUTHEASTERN ALASKA
NEIC reported an earthquake of M 5.0 in Coquimbo, Chile was felt with intensity up to II-III in the area(s) of Coquimbo, Chile in La Serena.
EMSC reported moderate to strong shaking in Chile at Monte Patria, Illapel, Salamanca, Coquimbo, La Serena, Vicuna, Santiago, Copiapo.
O: 04JUL2026 03:09:33 30.9S 71.5W ML=5.0 NEIC COQUIMBO, CHILE
NEIC reported an earthquake of M 2.5 in Northern California was felt with intensity up to II-III in the area(s) of Northern California near Anderson Springs.
O: 04JUL2026 02:23:40 38.8N 122.7W ML=2.5 NEIC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 5.2 in Mindanao, Philippines was felt with intensity up to II-III in the area(s) of Mindanao, Philippines with IV in Katangawan and II-III in Padada, Buayan.
O: 04JUL2026 02:21:23 5.4N 125.1E ML=5.2 NEIC MINDANAO, PHILIPPINES
NEIC reported an earthquake of M 4.8 in Sumbawa, Indonesia was felt with intensity up to II-III in the area(s) of Sumbawa, Indonesia near Tambolaka, Sumba, Indonesia.
O: 03JUL2026 17:14:52 9.5S 119.4E ML=3.8 NEIC SUMBAWA, INDONESIA
NEIC reported an earthquake of M 4.5 in Guadeloupe was felt with intensity up to II-III in the area(s) of Guadeloupe in Gingerland Saint George, Saint Kitts and Nevis.
O: 03JUL2026 14:45:25 16.6N 59.6W ML=4.5 NEIC GUADELOUPE
EMSC reported an earthquake of M 2.5 in Southern California was felt with intensity up to IV in the area(s) of Southern California in Ramona.
O: 04JUL2026 05:42:09 33.3N 116.3W ML=2.5 EMSC SOUTHERN CALIFORNIA
EMSC reported an earthquake of M 4.4 in Kazakhstan was felt with intensity up to IV in the area(s) of Kazakhstan in Taraz.
O: 03JUL2026 23:40:55 43.5N 71.7E ML=4.4 EMSC CENTRAL KAZAKHSTAN
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM MAYSAK (DEPRESSION 10W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS MAYSAK 2026-07-04 00:00 UT 20.6N 107.8E 55 kts Southeast Asia
TS Maysak (TD 10W) continued today and made landfall off Vietnam with winds up to 55 kts. It is expected to track to the northwest over the next several days with winds up to 55 kts on or about July 4, 2026 making landfall near Hanoi, Vietnam. Some coastal damage is possible in Vietnam at that time. It is possible that a moderate earthquake near Laos or Vietnam or Sichuan, China will accompany landfall within several days. The antipode of today's location of Maysak is near 20S 72W in southern Peru and northern Chile near Tarapaca where moderately enhanced seismic activity is possible at this time.
SUPER TYPHOON BAVI (09W)
---- ------- ---------- -------- ----- ------ ------- ---------------
STYP BAVI 2026-07-04 00:00 UT 12.5N 150.8E 176 kts East of Guam
Super Typhoon Bavi (TD 09W) continued today east of Guam with winds up to 175 kts. It is expected to track to the northwest over the next week passing over Guam as a major typhoon with winds up to 180 kts on or about July 4-5, 2026. Major damage is possible in Guam at that time. Seismicity in Guam is sensitive to strong Typhoons. It is likely that a moderate to large earthquake near Guam will accompany the landfall of Bavi within several days. The antipode of today's location of Bavi is near 12S 26W near the mid-Atlantic ridge at 12S 30W where some enhanced seismicity is possible at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 3, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
4590 0041 0047 0050 C4.3 (July 3, 2026) 2.2E-03
Andreanof Is. M 4.2 00:48 UT
4630 0221 0235 0241 C4.1 (July 3, 2026) 4.7E-03
Halmahera M 6.2 02:31 UT
4670 0241 0248 0251 C4.3 (July 3, 2026) 2.9E-03
Hawaii M 3.3 02:42 UT
4720 0857 0951 1017 C9.2 (July 3, 2026) 3.3E-02
Macquarie Is. M 4.6 09:16 UT
Kyrgyzstan M 4.4 09:35 UT
Mindanao M 4.9, M 4.9 10:08 10:17 UT
4850 1303 1313 1316 M1.4 (July 3, 2026) 7.0E-03
4870 1426 1433 1435 C6.3 (July 3, 2026) 4.1E-03
Andreanof Is. M 3.8 14:35 UT
4890 1456 1501 1509 C5.8 (July 3, 2026) 4.7E-03
4920 1632 1651 1711 C6.5 (July 3, 2026) 1.4E-02
4930 1731 1736 1741 C6.3 (July 3, 2026) 4.0E-03
5010 1749 1811 1832 M6.7 (July 3, 2026) 9.9E-02
5030 1857 1859 1903 M6.3 (July 3, 2026) 2.3E-02
Banda Sea M 4.3 19:00 UT
Mindanao M 4.8 19:09 UT
5080 1959 2008 2019 M1.5 (July 3, 2026) 1.7E-02
Switzerland M 3.3 20:03 UT
Nevada M 2.4 20:03 UT
5100 2227 2235 2240 C8.4 (July 3, 2026) 5.7E-03
5130 2350 //// 0005 M2.0 (July 3, 2026) 1.0E-02
Fiji M 4.5 00:00 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: major storms July 4 minor storms July 5 active July 6. Solar M-flare chance: 70% X-class: 20% proton storm: 20%
AP Indicies: global: 10, high: 8, mid-latitude: 11, time of max k: 22:00-24:00 UT; Max k: 4 Global Kp 3.67 2200-2400, July 3; Sunspot Number: 112; Radio Flux: 187
July 3, 2026
Notable earthquakes and events:
A strong excursion (geomagnetic field strengthening) in the geomagnetic field was registered by the GOES 19 magnetometer
beginning about 03:50 UT and peaking around 04:00 UT on July 3, 2026. An arcjet maneuver was
performed to reposition the satellite and normal operations resumed by 05:15 UT.
Longitudes which were at local solar noon at this time are near 125 East and
include Halmahera, Taiwan and Minahassa and Mindanao. A geomagnetic excursion
of this strength could help trigger moderately strong to strong seismic
events in these regions. In fact a strong earthquake of M 6.1 occurred in the
Ryukyu Islands northeast of Taiwan at the peak of this geomagnetic event.
The M 6.1 was preceded by a foreshock of M 4.9 near the same epicenter
at the start of this geomagnetic change.
A strong earthquake of M 6.1 was felt in the area of northern Taiwan and the
Southern Ryukyu Islands, Japan today. NEIC reported it was felt in the
Southern Ryukyu Islands with intensity III in Ginowan, Okinawa, Japan.
It was preceded by a foreshock of M 4.9 11.5 minutes earlier and by an M 4.7 earlier in the day. This earthquake
occurred during a strong geomagnetic enhancement registered at GOES 19 magnetometer
(see above). This is the strongest earthquake in the southern Ryukyu Islands
within about 200 km of this epicenter since an M 6.3 on September 18, 2023
at a focus of 183 km but the last event at a shallow focus in this area of
M>=6.1 occurred as a series on April 20, 2007 including events of M 6.1 and M 6.2.
Two tropical cyclones may have helped promote a strong earthquake in this
area at this time. Typhoon Mekkhala passed over this epicenter last week
as the first major typhoon of the season on June 24-26, 2026 as reported in this summary
at the time:
"TYP MEKKHALA 2026-06-25 00:00 UT 23.6N 124.7E 85 kts Ryukyu Islands
TS Mekkhala (TD 07W) continued today in the Ryukyu Islands with winds up to 85 kts. It is expected to track to the northeast over the next day east of the northern Philippines. This storm could help promote enhanced seismicity in the Philippines, Taiwan and the Ryukyu Islands, Japan in the next several days." (June 24-26, 2026)
A regional storm - TS Maysak - is currently active near northern Vietnam
to the southwest of this epicenter in the Ryukyu Islands where it made
landfall today. Stresses associated with this storm may also have helped
promote this earthquake at this time. This was described in this summary as:
"TS MAYSAK 2026-07-03 00:00 UT 17.6N 109.7E 45 kts Southeast Asia
TS Maysak (TD 10W) continued today and made landfall off Vietnam with winds up to 45 kts. It is expected to track to the northwest over the next several days with winds up to 50 kts on or about July 4, 2026 making landfall near Hanoi, Vietnam. Some coastal damage is possible in Vietnam at that time. It is possible that a moderate earthquake near Laos or Vietnam or Sichuan, China will accompany landfall within several days. The antipode of today's location of Maysak is near 18S 71W in southern Peru where moderately enhanced seismic activity is possible at this time." (July 3, 2026)
Today's earthquake at 25 North latitude occurred within minutes of local
solar noon when the sun was directly overhead at noon - a classic sub-solar
earthquake. A similar sub-solar M 6.0 hit the Gulf of California, Mexico
two days ago.
O: 03JUL2026 04:04:48 25.9N 125.9E ML=6.1 NEIC NORTHEAST OF TAIWAN
O: 03JUL2026 03:53:22 26.1N 125.9E ML=4.9 NEIC NORTHEAST OF TAIWAN
O: 02JUL2026 14:44:30 23.7N 122.6E ML=4.7 NEIC NORTHEAST OF TAIWAN
NEIC reported an earthquake of M 5.9 in the Kuril Islands was felt with intensity up to II-III in the area(s) of the Kuril Islands near Severo-Kuril'sk.
O: 03JUL2026 08:22:53 48.3N 154.3E ML=5.9 NEIC KURIL ISLANDS
The strongest earthquake in the world today was an M 6.2 in Halmahera midway
between recent major earthquakes in Mindanao, Philippines and Sulawesi,
Indonesia. Like the later earthquake in the Ryukyu Islands (see above)
this earthquake in Indonesia also occurred near local solar noon and
may have been promoted by tidal and/or geomagnetic energies.
NEIC reported aftershocks of M 4.7 and M 4.6 in Halmahera, Indonesia were felt with intensity up to II-III in the area(s) of Halmahera, Indonesia with II in Manado, Sulawesi.
The M 6.2 is the strongest earthquake in Halmahera within about 150 km of this
epicenter since an M 7.4 about 200 km southwest of today's epicenter on Aril 1, 2026.
O: 03JUL2026 02:31:28 1.8N 127.5E ML=6.2 NEIC HALMAHERA, INDONESIA
O: 03JUL2026 08:11:39 1.7N 127.4E ML=4.7 NEIC HALMAHERA, INDONESIA
O: 03JUL2026 04:17:53 1.7N 127.3E ML=4.6 NEIC HALMAHERA, INDONESIA
NEIC reported an earthquake of M 3.9 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in McCloud and Lakeport with lesser shaking possible in Chico, Orland and El Dorado Hills.
O: 03JUL2026 01:39:10 39.8N 122.7W ML=3.9 NEIC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 4.2 in Costa Rica was felt with intensity up to II-III in the area(s) of Costa Rica in San Rafael, San Jose, Santo Domingo, Heredia, Desemparados, Alajuela and Santa Ana.
EMSC reported it was felt quickly in Costa Rica at Escazu, San Felipe, Alajuela, San Pedro, Florencia, Guacimo, and in Juigalpa, Nicaragua.
O: 03JUL2026 04:18:06 9.8N 84.3W ML=4.2 NEIC COSTA RICA
NEIC reported an earthquake of M 3.2 in Wyoming was felt with intensity up to II-III in the area(s) of Wyoming in Green River.
O: 03JUL2026 02:56:12 41.5N 109.9W ML=3.2 NEIC WYOMING
NEIC reported an earthquake of M 4.2 in the Andreanof Islands, Alaska was felt with intensity up to II-III in the area(s) of the Andreanof Islands, Alaska with IV near Adak.
This earthquake occurred near local solar noon and may have been promoted
by tidal and/or geomagnetic stresses. A strong C-class flare occurred
minutes before when this epicenter was at exactly local solar noon. SFE
from this flare may have helped trigger this event in the Aleutians.
O: 03JUL2026 00:48:59 51.4N 178.4W ML=4.2 NEIC ANDREANOF ISLANDS, ALASKA
NEIC reported an earthquake of M 4.3 in Mindanao, Philippines was felt with intensity up to II-III in the area(s) of Mindanao, Philippines in Buayan.
O: 02JUL2026 18:13:24 5.6N 125.0E ML=4.3 NEIC MINDANAO, PHILIPPINES
NEIC reported an earthquake of M 4.7 in Eastern Honshu, Japan was felt with intensity up to II-III in the area(s) of Eastern Honshu, Japan at Utsunomiya, Tochigi.
EMSC reported an M 5.1 later off the coast of Honshu was felt lightly in Ojima and Urayasu, Japan.
O: 02JUL2026 11:48:28 37.2N 138.4E ML=4.7 NEIC EASTERN HONSHU, JAPAN
O: 03JUL2026 01:44:51 38.8N 142.2E ML=5.1 NEIC NEAR EAST COAST OF HONSHU, JAPAN
NEIC reported an earthquake of M 5.2 in the Dodecanese Islands, Greece was felt with intensity up to II-III in the area(s) of the Dodecanese Islands, Greece in Karpathos, Falirakion, Ialisos, Lardos, Soroni and Afantou.
EMSC reported it was felt with moderate intensity in Greece at Karpathos, Gennadi, Lardos, Afantou, Dhamatria, Kremasti, Faliraki, Ialysos, Rodos, and in Turkey in Icmeler, Marmaris, Dalaman, Dalyan, Gocek, Ortaca, FethiyeMilas, Soke, Aydin, Alanya, Denizli.
O: 02JUL2026 11:06:21 35.3N 27.3E ML=5.2 NEIC DODECANESE ISLANDS, GREECE
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM DOUGLAS (04E)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS DOUGLAS 2026-07-03 00:00 UT 19.1N 128.1W 45 kts Pacific West of Mexico
TS Douglas (14E) continued today west of Baja California, Mexico in the north Pacific Ocean with winds up to 45 kts. It is expected to track to the northwest over the next several days with winds up to 45 kts but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Douglas is near 19S 52E in the South Indian Ocean and is not a seismic area.
TROPICAL STORM MAYSAK (DEPRESSION 10W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS MAYSAK 2026-07-03 00:00 UT 17.6N 109.7E 45 kts Southeast Asia
TS Maysak (TD 10W) continued today and made landfall off Vietnam with winds up to 45 kts. It is expected to track to the northwest over the next several days with winds up to 50 kts on or about July 4, 2026 making landfall near Hanoi, Vietnam. Some coastal damage is possible in Vietnam at that time. It is possible that a moderate earthquake near Laos or Vietnam or Sichuan, China will accompany landfall within several days. The antipode of today's location of Maysak is near 18S 71W in southern Peru where moderately enhanced seismic activity is possible at this time.
TYPHOON BAVI (09W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TYP BAVI 2026-07-03 00:00 UT 12.9N 154.2E 130 kts East of Guam
Typhoon Bavi (TD 09W) continued today east of Guam with winds up to 130 kts. It is expected to track to the northwest over the next week passing over Guam as a major typhoon with winds up to 180 kts on or about July 4-5, 2026. Major damage is possible in Guam at that time. Seismicity in Guam is sensitive to strong Typhoons. It is likely that a moderate to large earthquake near Guam will accompany the landfall of Bavi within several days. The antipode of today's location of Bavi is near 12S 26W near the mid-Atlantic ridge where some enhanced seismicity is possible at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 2, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
4230 0137 0156 0204 M4.2 (July 2, 2026) 3.5E-02
Central Peru M 4.8 01:39 UT
4260 0407 0415 0422 C8.6 (July 2, 2026) 6.8E-03
Virgin Is. M 4.0 04:18 UT
4270 0455 0501 0506 C8.5 (July 2, 2026) 4.5E-03
South Sandwich Is. M 5.2 05:14 UT
4300 0602 0609 0613 C5.6 (July 2, 2026) 3.0E-03
4310 0714 0722 0725 C6.3 (July 2, 2026) 3.9E-03
4360 1021 1026 1028 M2.8 (July 2, 2026) 7.1E-03
Dodecanese Is. M 5.2 11:06 UT
4530 2303 2312 2316 M1.2 (July 2, 2026) 6.8E-03
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: major storms July 3-4 minor storms July 5. Solar M-flare chance: 70% X-class: 20% proton storm: 20%
AP Indicies: global: 4, high: 2, mid-latitude: 4, time of max k: 09:00-16:00 UT; Max k: 2 Global Kp 2.00 0000-0200, July 2; Sunspot Number: 101; Radio Flux: 203
July 2, 2026
Notable earthquakes and events:
A strong and sudden increase in the geomagnetic file occurred at both GOES 18 and 19
Satellites on July 1 peaking at about 20:00 UT. Longitudes where seismic
enhancement could be seen following this geomagnetic excursion are near
120 West (at local solar noon) and include areas of Washington, Oregon and California in western U.S. This followed a similar but
less intense spike which peaked at about 15:00 UT on July 1. Kp levels were
quiet throughout the day.
NEIC reported an earthquake of M 3.8 in Washington State (US) was felt with intensity up to II-III in the area(s) of Washington State (US) with IV in Edmonds and III in Freeland, Langley, Seattle, Kirkland, Camano, Concrete, Stanwood, Oak Harbor, and in general within about 100 km of the epicenter. It was also eported felt lightly in mount angel, Oregon, and in British Columbia at Sooke, Walnut Grove, Abbotsford, Chilliwack, Vancouver, Victoria, among others.
EMSC reported moderate shaking in Washington State at Oak Harbor, Camano, La Conner, Stanwood, Cathan, Shaker Church, Sisco Heights, Everett, Friday Harbor, Lynnwood, Ferndale, and in Canata at Victoria, Richmond.
An aftershock of M 2.3 was also reported by EMSC to have been felt in Anacortes, Washington.
The last earthquake with M>=3.8 within about 200 km of this epicenter in Washington
occurred more tha a year ago as an M 3.9 on March 6, 2025 and an M 4.5 on March 3, 2025.
At the time this summary noted:
"A moderate M 4.5 shook regions of northwestern Washington State and southern British Columbia. NEIC reported maximum intensity from this earthquake near Orcas Island, Washington at Eastsound, Friday Harbor, Lopez Island, Olga, Woodinville, Renton, Fox Island, Tacoma and in British Columbia at Cumberland and Sidney. Intensity III was felt in Portland, Eugene and Springfield, Oregon and in most areas of northwestern Washington including at Seattle and Bellingham, with
similar shaking in British Columbia in Duncan, Cowichan Valley, Vancouver, Victoria among many other communities.
Lesser shaking of intensity II was reported from Idaho, northern California, and as far as about 400 km from the epicenter.
A series of light aftershocks followed the mainshock. A foreshock of M 1.3 occurred three minutes before the mainshock.
No tsunami was observed nor expected.
...
"NEIC reported a light M 3.3 was felt in the region of Snoqualmie, Washington today. NEIC reported intensity III was felt in Snoqualmie, North Bend, Lynnwood, Gold Bar, Sultan, Washington and in Lake Cowichan, British Columbia, Canada and in Astoria, Oregon. Lesser shaking was
felt in Washington at Bothell, Carnation, Duvall, Fall City, Issaquah, Redmond, Renton and Seattle among others.
A foreshock today of M 2.8 in Washington State was reported felt with intensity II-III at Gold Bar, Bremerton, Issaquah, Seattle, Bremerton, Hansville, Port Orchard, Tacoma, Belfair, Hoodsport, Maple Valley, ?North Bend, Seattle and in Vicoria British Columbia, Canada." (February 27, 2025)
The last earthquake of M>=3.0 prior to this was an M 3.4 on February 22, 2025 and
an M 4.8 about 300 km northwest of this on February 21, 2025. At the time this
summary noted:
"A moderate earthquake of M 4.8 shook the area of northeastern Washington State and Southeastern British Columbia east of Vancouver B.C today. NEIC reported maximum shaking of intensity V in Sechelt, British Columbia, Canada and IV in B.C. at Cwichan Valley, Duncan, Gibsons, Lake Cowichan, Lions Bay, Nanaimo, Powell River, Squamist and in Washing at Maple Falls, Vancouver, Ellensburg, Maple Fall and Greenbank. Intensity III was felt in Washington State at Arlington, Concrete, Eastsound, Everson, Friday Habor, Point Robers, Lynden, Port Angeles, Vancouver among others and in British Columbia, Canada at Abbotsford, Campbell River, Chemainus, Ladysmith, Parksville, Pemberton, Vancouver, Victoria, Walnut Grove, Whistler, White Rock among others with lesser shaking as far as Seattle, Everett, Bellingham, and as far as Rufus, Oregon.
This is the strongest earthquake within about 200 km of this epicenter to occur
since an M 4.9 on December 30, 2015. At the time this summary noted:
"The most widely felt earthquake of the day was the M 4.9 in the Vancouver Island
region on the Puget Sound west of Seattle, Washington. While reported as far as New
Mexico and Indiana perceptible shaking from this event was probably limited to
an area about 200 km from the epicenter. NEIC reported intensity II-III in communities
throughout British Columbia and northwestern Washington State. More intense shaking
of intensity IV was reported in Washington at Friday Harbor, La Conner, Lopez Island, Lummi Island, Lynden, Point Roberts, Sumas, Forks, Sekiu, Olympia, Aberdeen, and in British Columbia at Sidney, Abbotsford, Aldergrove, Cowichan Valley, Cumberland, Duncan, Fort Langley, Lillooet, Lions Vay, North Cowichan, Sooke, Vancouver, Victoria, Walnut Grove and White Rock. No major damage or injuries were reported with this earthquake.
The Vancouver quake hit within an hour of local solar midnight and was probably
promoted by high tidal stresses which maximize at this time. The last earthquake
within about 150 km of this epicenter with M>=4.8 occurred on June 10, 2001 with M 5.0.
This was probably an aftershock of the M 6.8 earthquake near Olympia of February 28, 2001. " (December 30, 2015, February 21, 2025)
... This continued elevated regional seismicity in the area
of Washington and British Columbia of the past several days." (February 22, 2025)
These Earthquakes in Washington State are located at the fourth node (90 degrees) degrees from the M 7.4 in Vanuatu of December 17, 2024 and was likely promoted by energy from that source." (March 3, 2025)
Today's earthquake in Washington is at the sixth node (60 degrees) from Venezuela
and at 100 degrees from Mindanao and may have been promoted by energy from
those epicenters.
O: 02JUL2026 06:35:47 48.3N 122.6W ML=3.8 NEIC WASHINGTON STATE
O: 02JUL2026 06:48:56 48.3N 122.6W ML=2.3 EMSC PUGET SOUND REGION, WASHINGTON
A series of earthquakes occurred at various epicenters in the South Sandwich
Islands and southwest of Africa with moderate intensity. These were all
oceanic events and were not felt in the epicentral area. This area was
near local solar noon at the time of the full moon of June 29, 2026
and had been expected to see enhanced seismicity at this time in the
seismic forecast in this summary as:
"The full moon arrived on June 29, 2026 at 23:57 UT. Longitudes which are at local solar midnight at this time are located at about 0 East while those at local solar noon are near 180 West/East. In the east these include most of western Europe, England and Iceland and the south Mid-Atlantic Ridge and the South Sandwich Islands while in the west areas of the western Aleutians, Alaska, Hawaii, Tonga/Fiji/Kermadec Islands, New Zealand to the Balleny Islands and portions of the Pacific-Antarctic Ridge are included. These are the most likely areas to see significant tidal triggering with this full moon. Other areas may also see tidal promotion in the next week especially at times of large solar flares and near local solar midnight and solar noon. The likelihood of a strong associated earthquake with this full moon are moderate to high." (June 28 to July 2, 2026)
Today's activity in the South Atlantic began when the area was near local
solar midnight and may have been promoted by tidal and/or geomagnetic
effects which maximize near this hour.
O: 02JUL2026 05:23:17 61.0S 23.5W ML=5.3 NEIC SOUTH SANDWICH ISLANDS REGION
O: 02JUL2026 05:14:00 57.9S 8.5W ML=5.2 NEIC EAST OF SOUTH SANDWICH ISLANDS REGION
O: 02JUL2026 02:57:42 58.4S 26.6W ML=5.2 NEIC SOUTH SANDWICH ISLANDS REGION
O: 02JUL2026 02:17:58 59.5S 26.2W ML=4.9 NEIC SOUTH SANDWICH ISLANDS REGION
The other area - at the International Date Line (180 East/West longitude) also
saw a series of moderately large earthquakes today in the Tonga/Fiji area.
These included some of the largest earthquakes in the world today.
One of these - an M 5.7 in Tonga occurred near local solar noon and was felt
with intensity II in Tualele, Northwest Upolu, Samoa.
O: 02JUL2026 01:13:55 21.2S 178.8W ML=4.7 NEIC FIJI REGION
O: 01JUL2026 21:13:40 16.9S 174.8W ML=5.7 NEIC TONGA REGION
O: 01JUL2026 10:42:43 20.1S 178.7E ML=5.6 NEIC FIJI
O: 01JUL2026 17:28:36 23.8S 179.9W ML=4.5 NEIC SOUTH OF FIJI REGION
The strongest earthquake of the day in the world was an M 6.0 in northern
Honshu, Japan. NEIC reported it was felt with intensity IV in Aomori at Hachinohe, Misawa and III in Hokkaido, Akita and Miyagi, Japan.
This is an aftershock of the M 6.9 in the region which followed the
events in Venezuela on June 24, 2026.
O: 01JUL2026 12:08:29 40.1N 142,4E ML=6.0 NEIC NORTHERN HONSH?U, JAPAN
NEIC reported an earthquake of M 3.4 in Southern California was felt with intensity up to II-III in the area(s) of Southern California in La Quinta, Palm Desert, Thermal, Ramona, Palm Springs, Rancho Mirage, Idyllwild, El Cajon.
O: 02JUL2026 06:17:26 33.2N 116.1W ML=3.4 NEIC SOUTHERN CALIFORNIA
NEIC reported an earthquake of M 4.8 in Southern Peru was felt with intensity up to II-III in the area(s) of Central Peru in Cusco.
O: 02JUL2026 01:39:27 14.0S 72.9W ML=4.8 NEIC SOUTHERN PERU
NEIC reported an earthquake of M 4.4 in Maule, Chile was felt with intensity up to II-III in the area(s) of Maule, Chile in Concepcion, Bio-Bio.
EMSC reported moderate shaking in Bio-Bio, Chile in Tome, Concepcion, Coronel,
Chillan, Lota, Cabrero, San Carlos, Coihueco.
This epicenter is at 145 degrees from Mindanao and may have been promoted by
energy from that source. It is also at the eighth node (45 degrees) from
Venezuela.
O: 01JUL2026 19:52:02 36.5S 72.9W ML=4.4 NEIC MAULE, CHILE
NEIC reported an earthquake of M 5.5 in Hindu Kush, Afghanistan was felt with intensity up to II-III in the area(s) of Hindu Kush, Afghanistan in Tajikistan and Pakistan.
EMSC reported moderate ahsking in Dangam, Kabul, Afghanistan and in Timargar, Bat Khela, Peshawar, Attock City, Abbottabad, Islamabad, Rawalpindi, in India at Baramula, Sopur, Srinagar, in Uzbekistan at Samarkand, Tashkent, Salor, in Kazakhstan at Shymkent, Almaty, Talas, Kyrgyzstan, Lahore, Pakistan, and in Tajikistan at Dushanbe Almaty, ,
O: 01JUL2026 17:57:02 36.6N 70.4E ML=5.5 NEIC HINDU KUSH, AFGHANISTAN
NEIC reported an earthquake of M 4.4 in Costa Rica was felt with intensity up to II-III in the area(s) of Costa Rica in Golfito, Puntarenas.
O: 01JUL2026 13:41:16 8.7N 83.6W ML=4.4 NEIC COSTA RICA
EMSC reported an earthquake of M 4.2 in Greece was felt with intensity up to IV in the area(s) of Greece in Larisa, Rizrio, Trikala, Sellades and in Gostivar North Macedonia, and possible in Galatina, Italy.
O: 01JUL2026 09:54:14 39.1N 22.3E ML=4.2 EMSC GREECE
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM DOUGLAS (04E)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS DOUGLAS 2026-07-01 00:00 UT 17.6N 127.6W 45 kts Pacific West of Mexico
TS Douglas (14E) continued today west of Baja California, Mexico in the north Pacific Ocean with winds up to 45 kts. It is expected to track to the northwest over the next several days with winds up to 45 kts but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Douglas is near 16S 53E in the South Indian Ocean and is not a seismic area.
TROPICAL DEPRESSION 10W
---- ------- ---------- -------- ----- ------ ------- ---------------
TD 10W 2026-07-02 00:00 UT 17.6N 111.0E 45 kts Southeast Asia
TD 10W formed today off Vietnam with winds up to 45 kts. It is expected to track to the northwest over the next several days with winds up to 50 kts on or about July 4, 2026. Some coastal damage is possible in Vietnam at that time. It is possible that a moderate earthquake near Laos or Vietnam will accompany land fall within several days. The antipode of today's location of TD 10W is near 16S 68W in Bolivia where moderately enhanced seismic activity is possible at this time.
TYPHOON BAVI (09W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TYP BAVI 2026-07-02 00:00 UT 12.6N 156.6E 85 kts East of Guam
Typhoon Bavi (TD 09W) formed today east of Guam with winds up to 80 kts. It is expected to track to the northwest over the next week passing over Guam as a major typhoon with winds up to 140 kts on or about July 4-5, 2026. Major damage is possible in Guam at that time. Seismicity in Guam is sensitive to strong Typhoons. It is likely that a moderate to large earthquake near Guam will accompany the landfall of Bavi within several days, landfall of Typhoon Bavi. The antipode of today's location of Bavi is near 12S 24W near the mid-Atlantic ridge where some enhanced seismicity is possible at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of July 1, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
3760 0441 0456 0517 C7.6 (July 1, 2026) 1.3E-02
3770 0619 0627 0630 M1.1 (July 1, 2026) 4.7E-03
Loyalty Is. M 4.9 06:23 UT
South of Java M 4.0 06:30 UT
3790 0637 0643 0647 M1.0 (July 1, 2026) 5.0E-03
South of Java M 2.6 06:40 UT
3810 0728 0735 0738 M1.5 (July 1, 2026) 5.1E-03
3820 0807 0817 0820 M2.5 (July 1, 2026) 7.8E-03
3830 0845 0854 0927 C4.3 (July 1, 2026) 9.3E-03
Rat Is. M 4.2 09:01 UT
Sulawesi M 4.4 09:21 UT
3850 1004 1008 1011 M1.3 (July 1, 2026) 4.0E-03
Gulf of California M 4.1 10:14 UT
3950 1422 1431 1436 M1.1 (July 1, 2026) 7.9E-03
3970 1439 1454 1512 M2.6 (July 1, 2026) 4.2E-02
Honshu M 4.2 14:52 UT
South of Java M 3.6 15:09 UT
4020 1705 1712 1715 C8.2 (July 1, 2026) 3.3E-03
4120 1844 1943 1955 M3.5 (July 1, 2026) 6.4E-02
Bio-Bio Chile M 4.4 19:52 UT
4160 2015 2022 2028 M1.8 (July 1, 2026) 1.1E-02
Coquimbo M 4.0 20:15 UT
4180 2257 2309 2313 M8.5 (July 1, 2026) 3.7E-02
4210 2349 0002 0016 M1.1 (July 1, 2026) 1.4E-02
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active July 2 major storms July 3 minor storms July 4. Solar M-flare chance: 70% X-class: 20% proton storm: 20%
AP Indicies: global: 14, high: 11, mid-latitude: 15, time of max k: 00:00-06:00 UT; Max k: 4 Global Kp 4.67 0000-0200, July 1; Sunspot Number: 146; Radio Flux: 201
July 1, 2026
Notable earthquakes and events:
An X1.1 class solar flare (#3630) occurred late on June 30 UT. This flare is the first
X-class solar flare since and X1.1 on June 3, 2026 and is associated with
the same sunspot group as that flare. The last flares of significantly larger
energy were an X2.5 and X2.4 on April 24, 2026 (#8000 and 8100). This flare began
with a smaller precursor flare of C9.1 at 19:45 UT. A strong decrease in the electron
flux at GOES satellites occurred about 19:45 UT. At the same time a strong enhancement
of the geomagnetic field at GOES 18 was recorded afer a sharp decline in the
minutes before. This excursion in the field intensity caused GOES 18 orbital
changes which were corrected for by an arcject maneuver near 20:00 UT
and the system resumed normal operations by 21:07 UT. The Hp30 index from GFZ
shows a moderate geomagnetic storm beginning about 16:30 UT and a second about
12:00 UT of Kp5+ on June 30. A strong earthquake
of M 6.0 occurred in the Gulf of California at 19:45 UT near local solar noon at the
time of these flares and geomagnetic changes. This epicenter in Mexico was at the sub-solar latitude
(24 degrees) and was an obvious example of a sub-solar earthquake. This
summary has proposed in previous issues that sub-solar earthquakes are most
likely related to tidal and geomagnetic effects as the vertical tides
are maximized in these locations at this time. An M5.8 flare preceded the X-class
event beginning at 12:37 UT. This was accompanied by a strong enhancement
of electron flux at GOES satellites. The only flares of larger energy levels
in the month of June, 2026 occurred as an M 6.8 on June 21 (#1290) and several
associated with the X-class flare on June 3, 2026 of M9.3 and M7.7. Today's
flares combined with the stresses associated with the full moon of June 29
will likely lead to enhanced seismicity in longitudes near 180 degrees W and E and near
0 degrees W and E. These include areas of Tonga/Fiji and the South Sandwich
Islands among others as noted in the full moon seismic forecast in this
and previous issues of this summary.
"The full moon arrived on June 29, 2026 at 23:57 UT. Longitudes which are at local solar midnight at this time are located at about 0 East while those at local solar noon are near 180 West/East. In the east these include most of western Europe, England and Iceland and the south Mid-Atlantic Ridge and the South Sandwich Islands while in the west areas of the western Aleutians, Alaska, Hawaii, Tonga/Fiji/Kermadec Islands, New Zealand to the Balleny Islands and portions of the Pacific-Antarctic Ridge are included. These are the most likely areas to see significant tidal triggering with this full moon. Other areas may also see tidal promotion in the next week especially at times of large solar flares and near local solar midnight and solar noon. The likelihood of a strong associated earthquake with this full moon are moderate to high." (June 28 to July 1, 2026)
A strong M 6.0 and aftershocks up to M 5.3 occurred today in the Gulf of California.
NEIC reported intensity IV in Sinaloa, Mexico at Los Mochis and II-III in Guasave, Culiacan and La Palma.
The last earthquake within about 200 km of this epicenter in the Gulf of
California with M>=6 occurred as an M 6.4 on June 18, 2023 (also a sub-solar event)
and an M 6.6 on September 13, 2014. Similar sub-solar events hit the area on June 22, 1991 and
June 30, 1995, 31 years ago to the date. After the M 5.4 on June 18, 2023
this summary noted:
The strongest earthquake in the world today was an M 6.4 in the southern Gulf of California and Southern Baja California, Mexico. NEIC reported this earthquake was felt with intensity II-III in Baja California, Mexico in Los Cabos, Cabo San Lucas, Todos Santos, La Paz, Mazatlan, Concordia, Bucerias, Nayit, Tlalnepantla and Mexico City.
This earthquakes series began within minutes of local solar noon and was
probably promoted by strong tidal stresses associated with today's new moon.
The last earthquake in the Gulf of California within about 250 km of today's
series with M>=6.4 was an M 6.6 on September 13, 2015. Two other events have
hit this area in the past 35 years - an M 6.7 on October 21, 2010 and M 6.4 on October 3, 2002.
Changes in the seismicity of the area had been addressed in the previous
issue of this summary as:
"The aftershock swarm off the coast of Baja California following the M 6.2 in this
area of November 22, 2022 has ceased suddenly after seven months of nearly
continuous seismicity above the M>=3 level in the area. This sudden ceasing
of this seismicity is very anomalous. This whole series has been anomalous
as previously noted in this summary. It will be interesting to see whether
this aftershock activity returns after a period of inactivity.
Seismicity about 200 km to the east of this in the northern Gulf of California,
however, has increased in recent days. This, combined with a continuing
seismic enhancement in the Gulf of California about 400 km southeast of
this suggests that a stronger earthquake is likely approaching in that area." (June 18, 2023)
The M 6.7 on October 21, 2010 occurred with the full moon and at the time of the M 6.6 on September 13, 2015 occurred with the new moon this summary noted:
"A strong earthquake of M 6.6 (NEIC, EMSC) - M 6.7 (UNAM) hit the Gulf of California today. Only two similar
quakes have hit the area in the past 25 years - both of M 6.6-6.7.
A series of factors including new moon tidal stresses" (September 13, 2015, June 18, 2023)
Today's earthquakes in the Gulf of California occurred while major changes
in the geomagnetic and solar flux fields were occurring (see above) and
was probably promoted by these geomagnetic changes.
This epicenter in the Gulf of California is at the third node (120 degrees)
from Mindanao and at the ninth node (40 degrees) from Venezuela
and was probably promoted by constructive energy interference from those
sources.
O: 30JUN2026 19:45:41 24.8N 108.8W ML=6.0 EMSC GULF OF CALIFORNIA
O: 30JUN2026 19:45:40 24.8N 108.9W ML=6.0 NEIC GULF OF CALIFORNIA
O: 30JUN2026 21:01:34 24.7N 109.0W ML=5.3 NEIC GULF OF CALIFORNIA
NEIC reported an earthquake of M 3.4 in Hawaii was felt with intensity up to II-III in the area(s) of Hawaii in Naalehu, Pahala, Laupahoehoe, Honokaa, Papaikou, Honomu, Volcano, Pepeekeo, Hilo and Pahoa.
O: 01JUL2026 05:06:40 19.2N 155.5W ML=3.4 NEIC HAWAII
NEIC reported an earthquake of M 2.6 in Ontario, Canada was felt with intensity up to II-III in the area(s) of Ontario, Canada in Parry Sound.
O: 01JUL2026 04:41:03 45.8N 80.7W ML=2.6 NEIC SOUTHERN ONTARIO, CANADA
NEIC reported an earthquake of M 4.4 in Argentina was felt with intensity up to II-III in the area(s) of Argentina in Cordoba at Cordoba, Villa Carlos Paz and Alta Gracia.
EMSC reported moderate to strong shaking in Argentina at Cruz del Eje, Villa de Soto, Villa Allende, Villa Carlos Paz, Cordoba, Monte Cristo, Mina Clavero.
O: 01JUL2026 04:34:13 30.7S 64.4W ML=4.4 NEIC ARGENTINA
NEIC reported an earthquake of M 5.3 in China was felt with intensity up to VII in the area(s) of China near Dunhuang.
O: 30JUN2026 23:33:54 37.8N 95.3E ML=5.3 NEIC CHINA
NEIC reported an earthquake of M 4.9 in Mindanao, Philippines was felt with intensity up to II-III in the area(s) of Mindanao, Philippines in Buayan.
O: 30JUN2026 21:34:53 5.6N 125.3E ML=4.9 NEIC MINDANAO, PHILIPPINES
NEIC reported an earthquake of M 4.7 in Micronesia may have been felt with intensity up to II-III in the area(s) of Micronesia.
O: 30JUN2026 21:49:19 4.8N 146.4E ML=4.7 NEIC MICRONESIA
NEIC reported an earthquake of M 4.8 in Northern Honshu, Japan was felt with intensity up to II-III in the area(s) of Northern Honshu, Japan in Misawa, Aomori and Sendai, Miyagi.
O: 30JUN2026 14:02:23 40.1N 142.4E ML=4.8 NEIC NORTHERN HONSHU, JAPAN
EMSC reported an earthquake of M 5.0 in Central Peru was felt with intensity up to IV in the area(s) of Central Peru in San Fernando.
O: 01JUL2026 02:00:38 8.8S 74.9W ML=5.0 EMSC CENTRAL PERU
EMSC reported an earthquake of M 4.4 in Myanmar was felt with intensity up to IV in the area(s) of Myanmar in Sarupathar, India.
O: 30JUN2026 17:12:19 25.3N 96.6E ML=4.4 EMSC MYANMAR
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM DOUGLAS (04E)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS DOUGLAS 2026-07-01 00:00 UT 16.6N 126.6W 45 kts Pacific West of Mexico
TS Douglas (14E) formed today west of Baja California, Mexico in the north Pacific Ocean with winds up to 45 kts. It is expected to track to the northwest over the next several days with winds up to 45 kts but is not expected to significantly affect regional seismicity at this time. The antipode of today's location of TS Douglas is near 16S 53E in the South Indian Ocean and is not a seismic area.
TROPICAL DEPRESSION 10W
---- ------- ---------- -------- ----- ------ ------- ---------------
TD 10W 2026-07-01 00:00 UT 16.6N 112.0E 40 kts Southeast Asia
TD 10W formed today off Vietnam with winds up to 40 kts. It is expected to track to the northwest over the next several days with winds up to 50 kts on or about July 4, 2026. Some coastal damage is possible in Vietnam at that time. It is possible that a moderate earthquake near Laos or Vietnam will accompany land fall within several days. The antipode of today's location of TD 10W is near 16S 68W in Bolivia where moderately enhanced seismic activity is possible at this time.
TYPHOON BAVI (09W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TYP BAVI 2026-07-01 00:00 UT 12.6N 158.6E 80 kts East of Guam
Typhoon Bavi (TD 09W) formed today east of Guam with winds up to 80 kts. It is expected to track to the northwest over the next week passing over Guam as a major typhoon with winds up to 140 kts on or about July 4-5, 2026. Major damage is possible in Guam at that time. Seismicity in Guam is sensitive to strong Typhoons. It is likely that a moderate to large earthquake near Guam will accompany the landfall of Bavi within several days, landfall of Typhoon Bavi. The antipode of today's location of Bavi is near 12S 24W near the mid-Atlantic ridge where some enhanced seismicity is possible at this time.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of June 30, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
3310 0039 0116 0136 M1.3 (June 30, 2026) 2.9E-02
Kuril Is. M 4.4 00:46 UT
Virgin Is M 3.9 01:03 UT
3320 0311 0319 0332 C3.2 (June 30, 2026) 3.8E-03
3350 0617 0633 0652 C3.8 (June 30, 2026) 6.7E-03
3380 0911 0920 0932 C2.8 (June 30, 2026) 3.8E-03
3470 0932 0936 0938 C3.3 (June 30, 2026) 1.5E-03
3420 1220 1234 1237 C4.3 (June 30, 2026) 4.3E-03
El Salvador M 3.9 12:35 UT
3500 1237 1257 1323 M5.8 (June 30, 2026) 1.1E-01
Ryukyu Is. M 4.6 12:39 UT
3570 1623 1626 1634 C3.2 (June 30, 2026) 2.2E-03
3590 1639 1647 1653 C5.7 (June 30, 2026) 4.0E-03
Sulawesi M 4.0 16:52 UT 17:05 M 4.4.
3600 1714 1726 1731 C5.0 (June 30, 2026) 3.5E-03
Myanmar M 4.4 17:12 UT
3610 1831 1848 1900 C4.9 (June 30, 2026) 6.5E-03
Java M 2.9 18:28 UT
Talaud M 4.6 18:24 UT
3620 1945 1958 2035 C9.1 (June 30, 2026) 5.6E-03 *
Gulf of California M 6.0 19:46 UT M 4.5 20:29 UT
Sulawesi M 4.3 19:53 UT
3630 2034 2050 2100 X1.1 (June 30, 2026) 8.9E-02
Java M 2.6 20:35 UT
Gulf of California M 3.9 20:36 UT M 4.1 20:52 UT M 5.3 21:01 UT
3700 2306 2318 2326 C5.1 (June 30, 2026) 5.2E-03
Maule, Chile M 3.4 23:06 UT
Southern California M 2.2 23:09 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active July 1-2 major storms July 3. Solar M-flare chance: 65% X-class: 15% proton storm: 15%
AP Indicies: global: 17, high: 13, mid-latitude: 17, time of max k: 18:00-22:00 UT; Max k: 4 Global Kp 4.67 2000-2200, June 30; Sunspot Number: 139; Radio Flux: 203
June 30, 2026
Notable earthquakes and events:
The full moon arrived on June 29, 2026 at 23:57 UT. Longitudes which are at local solar midnight at this time are located at about 0 East while those at local solar noon are near 180 West/East. In the east these include most of western Europe, England and Iceland while in the west areas of the western Aleutians, Alaska, Hawaii, Tonga/Fiji/Kermadec Islands, New Zealand to the Balleny Islands and portions of the Pacific-Antarctic Ridge are included. These are the most likely areas to see significant tidal triggering with this full moon. Other areas may also see tidal promotion in the next week especially at times of large solar flares and near local solar midnight and solar noon. The likelihood of a strong associated earthquake with this full moon are moderate to high.
A moderately strong earthquake of M 5.5 occurred off the coast of Oregon today.
NEIC reported it was felt with intensity III in Sutherlin, Oregon and II in Oregon
at Seaside, Eugene, Portland, Rockaway Beach, Williams and possibly in San Francisco, California and Friday Harbor, Washington.
The last earthquake of M>=5.5 within about 200 km of today's epicenter was an
M 6.0 on January 16, 2026. At the time this summary noted:
"A strong earthquake of M 6.0 occurred today in the region off the coast of
Oregon. NEIC reported it was felt along the coast of Oregon with intensity IV in
Port Orford; III in Neskowin, Portland, Sherwood, Otis, Siletz, Seal Rock, Lake Oswego and Reedsport.
No tsunami was expected nor observed with this earthquake. The last earthquakes
off the coast of Oregon with M>=6 occurred as an M 6.0 on October 30, 2024 and an M 6.3 on October 29, 2019.
...
The last earthquakes within about 200 km of today's epicenter with M>=6 occurred
with M 6.3 on August 29, 2019 and M 6.2 on August 22, 2018. Only one other such
event has hit the area in the past 15 years - an M 6.0 on April 11, 2012.
At the time of the 2019 event this summary noted:
"This is the strongest earthquake off the coast of Oregon within about 250
km of this epicenter in more than 10 years - since an M 6.3 on January 10, 2008
and prior to that an M 6.3 on January 16, 2003. The only event in the region
with greater magnitude in the past 30 years was an M 6.9 on July 13, 1991." (August 29, 2019)
More recently on September 2, 2024 this summary reviewed recent seismicity in the area as:
"The strongest earthquake in the U.S. or Canada today was an M 4.2 off the coast of Oregon.
NEIC reported this earthquake of M 4.2 off the coast of Oregon was felt with intensity up to II in the area(s) of Oregon in Portland.
This area has been relatively quiet in recent months. The last earthquake
of M>=4.2 occurred on May 4, 2024 with M 4.3. The last of significantly larger
magnitude was an M 5.7 on March 27, 2024...." (January 16, 2026)
Today's event may be related to volcanism in the area off Oregon. The timing
however suggests tidal triggering from the full moon of June 29, 2026 combined
with energy related to the earthquakes in Venezuela of June 24. This epicenter
lies at the sixth node (60 degrees) from the quakes in Venezuela, similar
to an M 5.8 in Iceland yesterday. Far-field triggering at the third and sixth
nodes from Venezuela has been prominent in recent days as discussed
in previous issues of this summary.
O: 29JUN2026 11:35:33 43.4N 127.1W ML=5.5 NEIC OFF THE COAST OF OREGO
O: 29JUN2026 11:35:33 43.4N 127.1W MW=5.5 EMSC OFF COAST OF OREGON
O: 29JUN2026 13:38:54 43.0N 127.6W ML=3.4 EMSC OFF COAST OF OREGON
O: 29JUN2026 12:47:10 43.3N 127.1W mb=3.9 EMSC OFF COAST OF OREGON
An example of the third node triggering from Oregon occurred today in Afghanistan
(following an M 6.1 there reported in the previous issue of this summary).
This event of M 4.5 occurred two minutes before the event off Oregon
and was felt lightly in Kabul, Afghanistan. It occurred at 120 degrees
(node 3) from Venezuela.
The events in Afghanistan and Oregon may have been promoted by SFE
from solar flare 3050 which was in progress when they occurred.
Data on this flare from SWPC follow.
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
3050 1120 1125 1135 C2.2 (June 29, 2026) 1.6E-03 *
Afghanistan M 4.5 11:33 UT
Oregon M 5.5 11:35 UT
O: 29JUN2026 11:33:12 36.6N 70.7W ML=4.5 EMSC HINDU KUSH, AFGHANISTAN
NEIC reported an earthquake of M 4.2 in the North Atlantic off the coast of Nova Scotia and Newfoundland, Canada may have been felt with intensity up to II-III in the area(s) of the North Atlantic off the coast of Nova Scotia and Newfoundland, Canada near Saint Pierre and Miquelon.
This is an unusual earthquake since the last event of M>=4.2 within about
200 km of this epicenter occurred on on June 19, 2022 with M 4.5. Only two other
events of M>=4.2 have occurred in ts area in the past 35 years - an M 4.7 on January 25, 2005
and an M 4.3 on March 17, 1998. At the time of the June, 2022 event this summary
noted:
"An unusual earthquake of M 4.5 occurred today in the North Atlantic Ocean
east of Maine. It was not reported felt in this remote area. NEIC reported this earthquake of M 4.5 in the North Atlantic was felt with intensity II-III in the area(s) of New Brunswick, Canada and Franklin, Maine.
This is the strongest earthquake within about 200 km of this epicenter in the North
Atlantic since an M 4.7 on January 25, 2005, the only such event in
this area in at least 30 years. When the event in January, 2005 occurred
this summary noted it as:
"Two moderate earthquakes of M>=4.5 occurred today at opposite sides of
the North American continent. The most unusual of these was an M 4.7 in
the North Atlantic Ocean in the Laurentian Fan off Nova Scotia. This is
near the Grand Banks epicenter of 1929 which produced one of the most widespread
and damaging tsunamis to hit the eastern U.S. or Canada in historic times.
Today's event is too small to trigger a significant tsunami. No reports of
damage or casualties from this quake have been reported. This earthquake was
located at 102 degrees from the M 6.8 in Honshu, Japan last week - a strong
cusp distance from that event. This is the strongest earthquake located by
NEIC in the area (30-50N 46-66W) in at least five years. It appears to be
the strongest in the region (40-50N 46-60W) to occur in the past 30 years - since
an M 5.2 about 100 km from this epicenter on Oct. 6, 1975." (January 26, 2005, June 19, 2022)
Today's earthquake occurred at the 10th node (36 degrees) from Venezuela and may have
been promoted by energy from that source as well as from tidal stresses
with the full moon which was completed hours before this event (see above).
O: 30JUN2026 05:36:44 44.4N 56.3W ML=4.2 NEIC NORTHERN ATLANTIC
NEIC reported an earthquake of M 2.9 in Missouri was felt with intensity up to II-III in the area(s) of Missouri with II in Hornersville, Williamsville and Poplar Bluff, it may also have been felt lightly in Arkansas and Tennessee.
Similar earthquakes occurred as an M 3.0 on September 6 and an M 2.9 on June 27, 2025
but the last of larger magnitude in this general area of northwestern Missouri
was an M 4.0 on November 18, 2021. At the time this summary noted:
"The largest earthquake felt in the U.S. or Canada today was an M 4.0 in southeastern Missouri. NEIC reported it was felt with maximum intensity V in Missouri at Poplar Bluff, Fairdealing, and Fisk, Holcomg, Clarkton, Neelyville, Oxly with IV in Williamsville, Ellsinore, Grandin, Wappapello, and II-III in Mill Spring, Greenville, and Broseley. It was also felt lightly throughout most of the southern United States as far as New Mexico and Florida with moderate shaking in Mississippi, Arkansas, Kentucky, Tennessee, Indiana, Illinois.
This is the strongest earthquake in Missouri within about 100 km of this epicenter
since an M 4.2 more than 27 years ago on February 5, 1994. The only other event
of M>=4 in the region in the past 30 years of similar magnitude was an M 3.9-4.0
on April 2, 2015 about 150 km southeast of today's epicenter." (November 18, 2021)
Today's epicenter is at the exact same distance (33.04-33.06 degrees) from Venezuela as the
M 3.6 in Indiana yesterday and so these two must be considered a pair related to those Venezuelan shocks. This is near the 11th node and may have been
promoted by energy from that source.
O: 30JUN2026 03:41:27 36.8N 90.6W ML=2.9 NEIC MISSOURI
O: 30JUN2026 03:41:27 36.9N 90.6W MD=2.8 EMSC SOUTHEASTERN MISSOURI
O: 29JUN2026 11:14:28 36.6N 89.6W MD=2.0 EMSC SOUTHEASTERN MISSOURI
The M 3.5-3.6 in Indiana had been discussed in the previous issue of this summary as:
"A light earthquake of M 3.5 hit the region of Indiana and Illinois today. NEIC reported it was felt with intensity up to IV in Indiana, Illinois, Kentucky with IV reported in Indiana at Bichnell, Shelburn, Sullivan, Westfield and Evansville and III in Kentucky at Webster, as well as in Illinois at Martinsville, McLeansboro and in Indiana in Oaktown and Bristow. It was also widely felt in Princeton, Newburgh, Indiana, Mount Carmel, Olney, Lawrenceville, Illinois, and as far as 200 km in Saint Louis, Missouri and Chicago Illinois.
The last earthquake within about 150 km of this epicenter with M>=3.5
occurred as an M 3.5 on September 19, 2017. A moderate earthquake also
hit the area with M 5.2-5.4 on April 18, 2008. At the time this summary noted:
"The strongest earthquake in the U.S. or Canada outside Alaska today was an M 3.8 in Illinois.
This appears to be a delayed eclipse earthquake lying on the path of totality
of the August 21, 2017 solar eclipse. It is similar to an earthquake in Illinois
which occurred with the greate M 8.2 in Mexico on September 8, but, unlike
that event today's occurred before the Mexican quake, not after. NEIC reported
today's earthquake in Illinois was felt with maximum intensity IV in Mount Carmel, Bone Gap, Browns, West Salem, Illinois.
It was also reported felt with lesser intensity through much of Illinois, Indiana
and Missouri up to about 400 km from the epicenter. No damage or casualties
were reported with this earthquake. The earthquake of September 9 was M 3.2.
The last of M>=3.8 within about 150 km of this Illinois epicenter occurred on
April 18, 2008 with M 5.4 with an aftershock of M 4.0 on April 21, 2008." (September 19, 2017)
Today's earthquake occurred near local solar midnight and may have been promoted
by tidal stresses associated with today's full moon (see above).
This epicenter is at the 11th node (32.8 degrees) from the earthquakes of
M 7.2 and M 7.5 of June 24, 2026 in Venezuela and were likely promoted
by energy from that source. It is also at 144 degrees from the South Geomagnetic Pole; at the seventh node (52 degrees) from the North Geomagnetic Pole and
at tht fourth node (90 degrees) from Northern Honshu, Japan." (June 29, 2026)
O: 29JUN2026 07:05:42 38.6N 88.0W ML=3.5 NEIC SOUTHERN INDIANA
NEIC reported an earthquake of M in was felt with intensity up to II-III in the area(s) of
O: 29JUN2026 07:05:42 38.6N 88.0W ML=3.5 NEIC SOUTHERN INDIANA
NEIC reported an earthquake of M 3.1 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaska with III in Anchorage, and II in Palmer, Chugiak and Eagle River.
O: 29JUN2026 22:39:50 51.7N 148.3W ML=3.1 NEIC SOUTHERN ALASKA
O: 29JUN2026 10:19:31 61.2N 149.6W ML=3.2 EMSC SOUTHERN ALASKA
O: 29JUN2026 22:39:51 61.7N 148.2W ML=3.1 EMSC SOUTHERN ALASKA
NEIC reported an earthquake of M 3.9 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaska in Kodiak.
O: 29JUN2026 15:29:10 58.5N 152.6W ML=3.9 NEIC SOUTHERN ALASKA
O: 29JUN2026 15:29:10 58.5N 152.6W ML=3.9 EMSC KODIAK ISLAND REGION, ALASKA
Aftershocks continued in northern Venezuela today. Among these NEIC reported an earthquake of M 4.6 in Venezuela was felt with intensity up to II-III in the area(s) of Venezuela in Chaco, Miranda, El Hatillo, San Antonio de los Altos, Petare, El Cafetal and Caracas with IV and III in La Dolorita, Baruta, Carrizal, Caraballeda, Los Teques, Guatire, San Felipe.
O: 29JUN2026 11:01:03 10.8N 66.8W ML=4.6 NEIC NORTHERN VENEZUELA
Among a number of apparently far-field earthquakes from Venezuela in the
past several days (see this and previous issues for details) one stands out.
This was a seemingly inconspicuous event of M 4.2 south of Java, Indonesia.
It was widely felt and was reported by EMSC to have been felt by at least
125 responders. This may be in error however since the BMG website
does not give any details of felt activity with this earthquake.
The location is important however as it lies within about 100 km of
exactly antipodal to the events in Venezuela, the most conspicuous
of a series of events in the past two days in this region of Java.
Readers recall that two epicenters are antipodal if the numerical latitudes
are the same in two different hemispheres (N and S) and the absolute
value of the longitudes in different hemispheres (E and W) is 180 degrees.
In this case the events in Venezuela were at 11N 68W and those for
this event in Java at 11S 112E and readers can confirm antipodality.
This area south of Java is an active seismic zone but the last earthquake
of M>=4.2 in the area within about 100 km of this epicenter occurred
on January 23, 2026 with M 4.5.
This earthquake occurred about one minute before the strongest earthquake
aftershock in Venezuela today (see above).
An earlier event of M 3.7 occurred within minutes of local solar midnight
in Java and was not felt. This is a striking example of antipodality.
The epicenter of this event is at 10.8S 111.8E whereas the M 7.5 in
Venezuela was located at 10.5N 68.5W - a difference from true antipodality
of less than 50 km - within error limits of true antipodal events.
O: 29JUN2026 10:59:59 11.1S 112.8W ML=4.2 EMSC SOUTH OF JAVA, INDONESIA
O: 29JUN2026 10:59:59 11.1S 112.8E ML=4.2 EMSC SOUTH OF JAVA, INDONESIA
O: 29JUN2026 15:13:13 10.7S 109.4E ML=3.8 EMSC SOUTH OF JAVA, INDONESIA
O: 29JUN2026 16:09:57 10.8S 111.8E ML=3.7 EMSC SOUTH OF JAVA, INDONESIA
EMSC reported an earthquake of M 3.6 in the Canary Islands was felt with intensity up to IV in the area(s) of the Canary Islands at Pajara.
O: 30JUN2026 01:31:37 28.2N 15.1W ML=3.6 EMSC CANARY ISLANDS, SPAIN REGION
O: 29JUN2026 07:40:07 30.8N 18.0W ML=3.4 EMSC CANARY ISLANDS, SPAIN REGION
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
There are no tropical cyclones currently active
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of June 29, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
2870 0032 0041 0049 C5.1 (June 29, 2026) 4.3E-03
2880 0226 0232 0235 C3.1 (June 29, 2026) 1.7E-03
2890 0243 0250 0256 C3.0 (June 29, 2026) 2.1E-03
2900 0307 0317 0322 C4.8 (June 29, 2026) 4.5E-03
Kermadec Is. M 4.9 03:10 UT
2910 0322 0340 0351 C4.1 (June 29, 2026) 7.7E-03
Southern Alaska M 5.3 03:32 UT
2950 0740 0758 0806 C6.5 (June 29, 2026) 1.0E-02
Central America M 5.1 07:38 UT
Kamchatka M 4.6 07:36 UT
2960 0806 0828 0834 C8.1 (June 29, 2026) 1.2E-02
2990 0953 1005 1010 C3.0 (June 29, 2026) 3.0E-03
3050 1120 1125 1132 C2.2 (June 29, 2026) 1.6E-03
Afghanistan M 4.5 11:33 UT
Oregon M 5.5 11:35 UT
3060 1208 1212 1223 C1.9 (June 29, 2026) 1.8E-03
3070 1229 1234 1237 C2.5 (June 29, 2026) 1.2E-03
Xinjiang, China M 4.8 12:33 UT
3150 1721 1730 1732 C3.5 (June 29, 2026) 3.2E-03
3190 1732 1740 1757 C6.1 (June 29, 2026) 8.4E-03
3180 1928 1933 1938 C3.0 (June 29, 2026) 2.0E-03
Kamchatka M 4.6 19:29 UT
3210 1943 1947 1949 C4.4 (June 29, 2026) 1.7E-03
3240 2024 2034 2049 C3.7 (June 29, 2026) 5.2E-03
3240 2056 2100 2103 C5.6 (June 29, 2026) 2.2E-03
3260 2113 2140 2152 M1.4 (June 29, 2026) 2.2E-02
Taiwan M 4.2 21:15 UT
El Salvador M 4.4 21:27 UT
Fiji M 4.6 21:38 UT
3300 2347 2353 2356 C2.8 (June 29, 2026) 1.6E-03
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: minor storms June 30 active July 1-2. Solar M-flare chance: 60% X-class: 10% proton storm: 5%
AP Indicies: global: 3, high: 2, mid-latitude: 4, time of max k: 12:00-16:00 UT; Max k: 2 Global Kp 1.33 1000-1300, June 29; Sunspot Number: 132; Radio Flux: 195
June 29, 2026
Notable earthquakes and events:
The full moon will arrive on June 29, 2026 at 23:57 UT. Longitudes which are at local solar midnight at this time are located at about 0 East while those at local solar noon are near 180 West/East. In the east these include most of western Europe, England and Iceland while in the west areas of the western Aleutians, Alaska, Hawaii, Tonga/Fiji/Kermadec Islands, New Zealand to the Balleny Islands and portions of the Pacific-Antarctic Ridge are included. These are the most likely areas to see significant tidal triggering with this full moon. Other areas may also see tidal promotion in the next week especially at times of large solar flares and near local solar midnight and solar noon. The likelihood of a strong associated earthquake with this full moon are moderate to high.
A light earthquake of M 3.5 hit the region of Indiana and Illinois today. NEIC reported it was felt with intensity up to IV in Indiana, Illinois, Kentucky with IV reported in Indiana at Bichnell, Shelburn, Sullivan, Westfield and Evansville and III in Kentucky at Webster, as well as in Illinois at Martinsville, McLeansboro and in Indiana in Oaktown and Bristow. It was also widely felt in Princeton, Newburgh, Indiana, Mount Carmel, Olney, Lawrenceville, Illinois, and as far as 200 km in Saint Louis, Missouri and Chicago Illinois.
The last earthquake within about 150 km of this epicenter with M>=3.5
occurred as an M 3.5 on September 19, 2017. A moderate earthquake also
hit the area with M 5.2-5.4 on April 18, 2008. At the time this summary noted:
"The strongest earthquake in the U.S. or Canada outside Alaska today was an M 3.8 in Illinois.
This appears to be a delayed eclipse earthquake lying on the path of totality
of the August 21, 2017 solar eclipse. It is similar to an earthquake in Illinois
which occurred with the greate M 8.2 in Mexico on September 8, but, unlike
that event today's occurred before the Mexican quake, not after. NEIC reported
today's earthquake in Illinois was felt with maximum intensity IV in Mount Carmel, Bone Gap, Browns, West Salem, Illinois.
It was also reported felt with lesser intensity through much of Illinois, Indiana
and Missouri up to about 400 km from the epicenter. No damage or casualties
were reported with this earthquake. The earthquake of September 9 was M 3.2.
The last of M>=3.8 within about 150 km of this Illinois epicenter occurred on
April 18, 2008 with M 5.4 with an aftershock of M 4.0 on April 21, 2008." (September 19, 2017)
Today's earthquake occurred near local solar midnight and may have been promoted
by tidal stresses associated with today's full moon (see above).
This epicenter is at the 11th node (32.8 degrees) from the earthquakes of
M 7.2 and M 7.5 of June 24, 2026 in Venezuela and were likely promoted
by energy from that source. It is also at 144 degrees from the South Geomagnetic Pole; at the seventh node (52 degrees) from the North Geomagnetic Pole and
at tht fourth node (90 degrees) from Northern Honshu, Japan.
O: 29JUN2026 07:05:42 38.6N 88.0W ML=3.5 NEIC SOUTHERN INDIANA
The strongest earthquake in the U.S. or Canada today was an M 5.3 in southeastern
Alaska near Cordova. NEIC reported it was felt with intensity III in Alaska at Girdwood, Anchorage, Indian, Eagle River, Palmer, Valdez, Seward and II in Cooper Landing, Chugiak, and Elmendorf AFB among others.
This is the largest earthquake within about 150 km of this epicenter since an M
5.6 on July 25, 2009 and an M 5.3 on August 24, 2004. A similar event of M 5.5
hit this area on March 1, 2000. At the time of the M 5.3 in August, 2004 this summary noted:
"In central Alaska an earthquake of M 5.3 was located early on August 25 (UT) near
Nelchina, Alaska. This earthquake is the strongest in the Denali National
Park area of Alaska (60-65N 143-150W) since the great earthquake of M 8.0-8.5
hit this area on Nov. 3, 2002, and is probably the strongest aftershock to date
of that event (with the exception of an M 6.0 that occurred 20 minutes after
the great earthquake). There has been some foreshock activity in the region
over the past several days.
...
The strongest events in the U.S. or Canada reported today were of M 3.8,
3.7 and 3.5 in the southern Alaska region east of Denali National Park.
These events occurred within about 10 km latitude and 100 km longitude
of forecast 20832 which expected this activity around August 22 with
maximum magnitude up to M 5.5." (August 25, 2004)
This epicenter is at the seventh node from TS Higos (51.4 degrees) and Antofagasta, Chile (103 degrees)
and near the fifth node (72 degrees) from Venezuela and may have been promoted
by energy from those sources as well as today's full moon tidal stresses.
O: 29JUN2026 03:32:39 60.2N 145.9W ML=5.3 NEIC SOUTHEASTERN ALASKA
O: 29JUN2026 03:32:39 60.2N 145.9W MW=5.3 EMSC SOUTHERN ALASKA
O: 29JUN2026 03:37:26 60.2N 145.9W ML=3.0 EMSC SOUTHERN ALASKA
NEIC reported an earthquake of M 5.2 in Mindanao, Philippines was felt with intensity up to II-III in the area(s) of Mindanao, Philippines in Manado, Sulawesi, Indonesia.
O: 29JUN2026 04:23:05 4.5N 125.1E ML=5.2 NEIC MINDANAO, PHILIPPINES
O: 29JUN2026 04:23:06 4.5N 125.2E MB=5.2 EMSC KEPULAUAN SANGIHE, INDONESIA
O: 29JUN2026 04:14:33 4.6N 125.4E mb=4.9 EMSC KEPULAUAN SANGIHE, INDONESIA
O: 28JUN2026 17:57:14 5.6N 125.3E MB=4.5 EMSC MINDANAO, PHILIPPINES
NEIC reported an earthquake of M 3.6 in Central Alaska was felt with intensity up to II-III in the area(s) of Central Alaska near Eagle Village.
O: 29JUN2026 01:36:28 64.8N 140.6W ML=3.6 NEIC EASTERN ALASKA
O: 29JUN2026 01:36:28 64.8N 140.7W ML=3.6 EMSC SOUTHERN YUKON TERRITORY, CANA
NEIC reported an earthquake of M 5.2 in Sichuan, China was felt with intensity up to II-III in the area(s) of Sichuan, China with IV in Xunbhang; III in Chengdu, Huayang and Chongqing and II in Leshan, Zigong.
EMSC reported moderate shaking in China at Zunchang, Yanjing, Lesha, Wenlin, Chengdu.
The last earthquake within about 200 km of this epicenter in Sichuan, China with
M>=5.2 was a similar M 5.2 on January 18m 2026 about 200 km southwest of today's epicenter.
The last event of significantly larger magnitude in this area was an M 5.8
on June 17, 2019. At the time this summary noted:
"The strongest earthquake of the day was an M 5.8 in Southern Sichuan, China. NEIC reported intensity up to VI in Sichuan at Xunchang and Yibin and II-III in Luzhou, Leshan, Sichuan and in Chongqing at Chongqing and Beibei. Also felt in Zunyi, Guzhou and in Guiyang, China.
Two aftershocks of M 5.2 were felt. NEIC reported intensity II-III in Sichuan at Chengdu and in Chongqing, China.
At least 12 were killed in this earthquake which also injured more than 135 people.
A hotel and up to 73 houses collapsed in the earthquake. A hospital in Changning County was also damaged. Most of the deaths
were caused bu the structural collapse. Nearly 5000 were evacuated. Sectionis of highway
were closed or covered by landslides. The event occurred near local solar
midnight, a prime time for tidal triggering with the full moon which arrived today. This epicenter is near the fourth node (90 degrees) from the activity in the
Kermadec Islands and was probably promoted from that source. A highly unusual
earthquake in western Texas at 29N 104W also occurred at the fourth node from
the Kermadec Islands today and was symmetric with the activity in Sichuan.
The only other event of M>=5.9 within about 200 km of this epicenter in Sichuan,
China in the past 30 years occurred August 3, 2014 about 250 km southwest of
today's epicenter." (June 17, 2019)
Like the event in June, 2019 (see above) today's earthquake in Sichuan
occurred with the full moon. This epicenter is located at 141 degrees
from Venezuela and at the 12th node (30 degrees) from Mindanao and Sulawesi and
the sixth node from the north geomagnetic pole and may have been promoted
by energy from those sources.
O: 28JUN2026 16:12:08 28.6N 104.8E ML=5.2 NEIC SICHUAN, CHINA
O: 28JUN2026 16:12:08 28.6N 104.8E MW=5.2 EMSC EASTERN SICHUAN, CHINA
NEIC reported an earthquake of M 5.0 in North Island, New Zealand was felt with intensity up to II-III in the area(s) of North Island, New Zealand with III in Palmerston North, Lower Hutt, Kapiti, Wellington, Foxton Manawatu-Wanganui and II in Porirua.
GeoNet reported this earthquake of M 4.8 in North Island, New Zealand with the following parameters:
O: 28JUN2026 11:04:13 40.4S 174.5E MB=4.8 GEONET Felt with moderate intensity in the area of Southern North Island, New Zealand and northern South Island. 5258 reports of felt events were made of which 3133 reported weak and 1890 light intensity with 221 reports of moderate shaking and 10 with strong and 3 severe and 1 with extreme intensity came from the area.
This epicenter is near the third node (120 degrees) from Venezuela and
may have been promoted by energy from that source.
O: 28JUN2026 11:04:12 40.4S 174.4E ML=5.0 NEIC NORTH ISLAND, NEW ZEALAND
EMSC reported aftershocks continued in Venezuela today. Earthquake of M 4.3 and M 4.5 in Northern Venezuela was felt with intensity up to IV in the area(s) of Northern Venezuela with IV in Venezuela at Valencia and II in El Cafetal, Miranda, El Limon, Aragua, Cagua, San Antonio de los Altos, Baruta, and Los Teques.
The official toll reached more than 1400 deaths associated with the mainshocks
of June 24 but this is still expected to rise considerably as thousands
are still missing under collapsed buildings in Venezuela.
Moderate earthquake at an near the antipode of those events in the area
south of Java, Indonesia continued today with some approaching within
50 km of the exact antipodal latitude and longitude.
These are expected to continue and include a new event of M>=4 in the
next several days.
O: 28JUN2026 09:33:58 10.4N 68.4W ML=4.3 NEIC NORTHERN VENEZUELA
O: 28JUN2026 08:46:09 10.7N 68.3W MB=4.5 EMSC FALCON, VENEZUELA
O: 28JUN2026 09:33:58 10.5N 68.4W mb=4.3 EMSC CARABOBO, VENEZUELA
O: 28JUN2026 08:46:10 10.7N 68.5W ML=4.5 NEIC NORTHERN VENEZUELA
NEIC reported an earthquake of M 4.4 in Colombia was felt with intensity up to II-III in the area(s) of Colombia in Quimbaya, Quindio and Pereira, Risaralda.
EMSC reported moderate shaking in Pereira, Santa Rosa de Cabal, Manizales, Sabaneta, Itagui, Libano, Medellin, Soacha, Bogota, Villavicencio, Pitalito.
O: 28JUN2026 08:39:25 5.1N 76.3W MB=4.4 EMSC COLOMBIA
O: 28JUN2026 08:39:25 5.1N 76.2W ML=4.4 NEIC COLOMBIA
EMSC reported an earthquake of M 4.7 south of Africa was not felt in this remote area.
This epicenter is at 103 degrees from the earthquakes in Venezuela and
was probably promoted by energy from those sources.
O: 28JUN2026 08:34:26 52.7S 27.6E MB=4.7 EMSC SOUTH OF AFRICA
O: 28JUN2026 08:34:26 52.7S 27.6E MB=4.7 EMSC SOUTH OF AFRICA
EMSC reported an earthquake of M 4.4 in Southern Greece was felt with intensity up to IV in the area(s) of Southern Greece in Nafplio, Kalamata, Tripoli, Drapetsona, Moskhaton, Keratsini, Elefsina, Zagrafos, among others.
O: 28JUN2026 22:08:28 37.0N 22.9E MB=4.4 EMSC SOUTHERN GREECE
EMSC reported an earthquake of M 4.6 in Northern Algeria was felt with intensity up to IV in the area(s) of Northern Algeria in Djelfa, Charef.
This epicenter is at the fourth node (90 degrees) from Antofagasta and
may have been promoted by energy from that source.
O: 28JUN2026 18:37:12 34.8N 2.9E MB=4.6 EMSC NORTHERN ALGERIS
EMSC reported an earthquake of M 4.0 in Western Turkey was felt with intensity up to IV in the area(s) of Western Turkey in Yagcilar, Balikesir, Salihli, Manisa, Odemis, Bornova, Edremit, Bayrkli, Izmir, Tire, Menemen, Gorukle, Nilufer, Esenler.
O: 28JUN2026 12:56:13 39.2N 28.1E MB=4.0 EMSC WESTERN TURKEY
EMSC reported an earthquake of M 4.4 in Myanmar was felt with intensity up to IV in the area(s) of Myanmar in Bangldesh at Dhaka and Paltan, and Tungi.
This epicenter was at a sub-solar latitude on June 28 and may have been
promoted by tidal stresses with the full moon of June 29.
O: 28JUN2026 15:53:17 21.6N 92.5E MB=4.4 EMSC MYANMAR-BANGLADESH
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
There are no tropical cyclones currently active
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of June 28, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
2590 0144 0155 0200 C4.1 (June 28, 2026) 2.8E-03
Southern California M 2.1 01:44 UT
2620 0646 0654 0703 C2.4 (June 28, 2026) 2.4E-03
West of Gibraltar M 4.2 06:59 UT
Vanuatu M 5.2 07:05 UT
2640 0703 0707 0709 C2.2 (June 28, 2026) 1.2E-03
Vanuatu M 5.2 07:05 UT
2720 1501 1509 1515 C2.7 (June 28, 2026) 2.0E-03
2780 2038 2046 2050 C2.8 (June 28, 2026) 2.3E-03
2790 2050 2059 2103 C3.3 (June 28, 2026) 2.7E-03
Guatemala M 4.0 20:55 UT
2800 2117 2144 2155 C9.5 (June 28, 2026) 1.5E-02
Afghanistan M 4.1 21:31 UT
ntofagasta M 4.2 21:53 UT
2810 2155 2159 2205 C8.7 (June 28, 2026) 5.5E-03
Southern Greece M 4.4 22:08 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: minor storms June 30 active July 1 quiet June 29. Solar M-flare chance: 50% X-class: 10% proton storm: 5%
AP Indicies: global: 5, high: 4, mid-latitude: 6, time of max k: 00:00-08:00 UT; Max k: 2 Global Kp 2.00 0000-0600, June 28; Sunspot Number: 131; Radio Flux: 186
June 28, 2026
Notable earthquakes and events:
The full moon will arrive on June 29, 2026 at 23:57 UT. Longitudes which are at local solar midnight at this time are located at about 0 East while those at local solar noon are near 180 West/East. In the east these include most of western Europe, England and Iceland while in the west areas of the western Aleutians, Alaska, Hawaii, Tonga/Fiji/Kermadec Islands, New Zealand to the Balleny Islands and portions of the Pacific-Antarctic Ridge are included. These are the most likely areas to see significant tidal triggering with this full moon. Other areas may also see tidal promotion in the next week especially at times of large solar flares and near local solar midnight and solar noon. The likelihood of a strong associated earthquake with this full moon are moderate to high.
The strongest earthquake today was an M 6.1 in the Hindu Kush area of Afghanistan.
NEIC reported it was felt with intensity IV in Afghanistan at Baghrami, Kabul and in Pakistan at Mingaora. Intensity III was felt in Pakistan at Peshawar, Haripur, Hazro, Punjab, Islamabad, as well as in Dushanbe, Tajikistan and Tashkent, Uzbekistan.
EMSC reported strong to moderate shaking in Pakistan, Afghanistan, Tajikistan, Uzbekistan, India, Kyrgyzstan, Turkmenistan.
The last earthquake in the Hindu Kush area of Afghanistan with M>=6.1 occurred
as an M 6.4 on January 11, 2024. At the time this summary noted:
"The strongest earthquake in the world today was an M 6.4-6.5 in Hindu Kush, Afghanistan. This intermediate focus earthquake (about 210 km depth) was widely felt. NEIC reported intensity up to V in Hindu Kush, Afghanistan at Jurm.
A foreshock of M 4.1 about two hours earlier was also felt with intensity V in Jurm, Afghanistan.
EMSC reported moderate to strong shaking in India, Pakistan, Afghanistan, Uzbekistan and Tajikistan in the communities of Kabul, Dushanbe, Peshawar, Swabi, Denov Tumani, Uzbekistan, Mansehra among others.
There were no immediate reports of serious damage or casualties although walls of a
number of houses in Sooch, Jurm were cracked. This epicenter is at the seventh
node (51.4 degrees) from the M 7.6 in Western Honshu of January 1, 2024 and was
probably promoted by energy from that source ..." (January 11, 2024)
This earthquake is located at the sixth node (60 degrees) from Mindanao and
Sulawesi and at 120 degrees from Venezuela (node 3) and continues
strong far-field triggering at the sixth and third nodes from that event
including a M 5.8 earlier in the day in Iceland near the sixth node (60 degrees).
O: 27JUN2026 13:34:52 36.4N 70.8E ML=6.1 NEIC HINDU KUSH, AFGHANISTAN
An earthquake of M 5.8 also occurred today in the area of Iceland. It was probably
felt in the area but this has not been immediately reported. This is the strongest
earthquake in Iceland within about 200 km of this epicenter since an M 6.2-6.3 on May 29, 2008.
The only other similar events in Iceland in the past 35 years occurred on June
17 and 21, 2000 with M 6.8 and M 6.5. At the time of the May, 2008 events
this summary noted:
"A strong earthquake of M 6.2 hit the region of Iceland today. This is a rare
event joining only four others which have hit the area in the past 50 years of
M>=6.2. Because the earthquake occurred under the main island, it was felt
strongly in Iceland. NEIC reported intensity VI at Laugaras and intensity V at
Seltjarnarnes, Vestmannayjar, Reykholar, Keflavik, Hafnarfjorthur, and Akranes.
Intensity IV was felt at Reykjavik and Kopavogur. Lesser shaking occurred in
Iceland at Mosfellsbar, Borgarnes, Akureyri. Because the earthquake was only 40
km from Reykjavik, the capital of Iceland, it rocked buildings in that city and
caused up to 15 injuries there. Nearer the epicenter at Selfoss, a city
southeast of the capital, 15-30 were injured. Many were panicked in Selfoss and
fled into the streets eventually setting up tents amid the aftershocks.
Evacuations have been proceeding as the earthquake caused a number of
landslides. A series of light aftershocks have been recorded. A number of homes
were damaged and the road between Reykjavik and Selfoss has been closed by quake
damage according to reports through Associated Press." (May 30, 2008)
Today's earthquake in Iceland is at 106 degrees from Mindanao and near the sixth node (60 degrees)
from Venezuela and may have been promoted by energy from those sources.
O: 27JUN2026 18:32:51 64.4N 22.4W ML=5.8 EMSC ICELAND
NEIC reported an earthquake of M 4.4 in Colombia was felt with intensity up to II-III in the area(s) of Colombia in Quimbaya, Quindio and Pereira, Risaralda.
EMSC reported moderate shaking in Pereira, Santa Rosa de Cabal, Manizales, Sabaneta, Itagui, Libano, Medellin, Soacha, Bogota, Villavicencio, Pitalito.
O: 28JUN2026 08:39:25 5.1N 76.2W ML=4.4 NEIC COLOMBIA
NEIC reported an earthquake of M 5.1 South of Sumatra was felt with intensity up to II-III in the area(s) of South of Sumatra in Karawang, Java, Indonesia.
EMSC reported moderate shaking in Biha. This epicenter is antipodal to
the event in Colombia today (see above).
O: 27JUN2026 21:10:26 6.2S 104.6E ML=5.1 NEIC SOUTH OF SUMATRA
NEIC reported an earthquake of M 5.8 in Northern Honshu, Japan was felt with intensity up to II-III in the area(s) of Northern Honshu, Japan with V in Hachinohe, Aomori; IV in Misawa, Morioka, Obihir, Hokkaido and II-III in Miyagi and Shizuoka.
EMSC reported moderate shaking in Japan at Takizawa and Tokyo.
Like the earthquake in Hindu Kush (see above) this epicenter is at the
third node (120 degrees) from Venezuela and may have been promoted by
energy from that source. It is an aftershock of the M 6.9 of June 24, 2026 which
may have been triggered by the SkS seismic wave from the M 7.2 quake
in Venezuela minutes earlier as noted in previous issues of this summary.
The last earthquakes within about 200 km of this epicenter in northern Honshu
with M>=5.8 occurred on June 24, 2026 (M 6.9); and April 20, 2026 (M 7.4).
O: 27JUN2026 20:21:50 40.2N 142.4E ML=5.8 NEIC NORTHERN HONSHU, JAPAN
EMSC reported continuing aftershocks including an earthquake of M 4.8 in Northern Venezuela was felt with intensity up to IV in the area(s) of Northern Venezuela with IV in El Limon, Palo Negro, Caracas, Turmero, Baruta, Valencia and III in Los Teques, San Mateo, Barquisimeto and Chacao.
O: 27JUN2026 19:20:36 10.6N 67.5W ML=4.8 NEIC NORTHERN VENEZUELA
An earthquake of M 5.6 (BKMG) occurred today in the area south of Java, Indonesia.
BMG reported it was felt with intensity III in Pacifan, Wonogiri, Tulungagung, Blitar and II in Kulon Progo, Bantul, Sleman, Yogyakarta, Trenggalek, Malang, Nganjuk, Magetan, Klaten, Ponorogo and Jember, Java, Indonesia.
NEIC reported intensity IV in Yogyakarta, Indonesia at Jetis and III in Yogyakarta and
Wonosari and in Java at Prambanan and Surakarta with lesser shaking in Madiun, and in Yogyakarta at Depok and Kasihan.
EMSC reported strong shaking in Indonesia at Gondang, Sewon, Yogyakarta, and Madiun City.
GOES magnetometers showed strong enhancement of the geomagnetic field
beginning at about 06:30 UT and lasting till about 07:15 UT. This may
have helped promoted this earthquake in Java.
This earthquake south of Java is within about 150 km of being exactly antipodal to the M 7.2 and M 7.5
in Venezuela of June 25, 2026 and was probably promoted by antipodal
seismic waves from that event. In the previous issue of this summary
it had been anticipated as:
"Because of its M 7.5 size the earthquake in Venezuela is likely to trigger
far-field aftershocks. When an M 7.3 earthquake occurred on August 21, 2018
in eastern Venezuela it was followed on September 29, 2018 by an M 7.5 in
the area of Sulawesi, so the antipodal nature of these areas is well established
by previous data. The exact antipode of today's epicenter is at 10S 111E
an area south of Java, Indonesia. This is a seismic region and was showing
a number of minor earthquake associated with solar flares today and could
see a strong or major event in the next several weeks." (June 25, 2026)
Earthquakes of M 5.8 and M 5.7 hit this area of Java on February 5 and January 27, 2026.
At the time this summary noted:
"The strongest earthquake in the world today was an M 5.8 (EMSC) to 6.4 (BMG) in Java, Indonesia. NEIC reported it was felt with maximum intensity V in Java at Jatiroto, Gondanglegi and in Yogyakarta at Pendong, Depok and Sweon with IV in Java at Jaten, Kediri, Magelang, Kanigoro, Surakarta, Mlati, and III in Driyorego, Grogol, and II in Grogol, Tabanan, Bandung, Karawang and Degangan.
EMSC reported strong shaking in Java at Sudimoro, Pacitan, Wonogiri, Karanganyar, Temenggungan, Klampok, Madiun, Bambanglipuro, Pugeran Maguwoharjo, Gampengrego, Yogyakarta, Surakarta, Depok Kasihan Me.ati amonther others where it woke many.
The last earthquake within about 200 km of this epicenter with M>=5.8 occurred
on June 30, 2023 with M 5.8. At the time this summary noted:
"A strong earthquake of M 5.8-6.4 shook the region of Java, Indonesia today.
BMG reported this earthquake of M 6.4 in Java, Indonesia was felt with intensity II-III in the area(s) of Java, Indonesia with VI in Pracimantoro, Wonogiri, Java, Pacitan; V in Wonogiri, Gunungkidul, Kebumen, Purworejo, Mageland, Kulon Progo, Bantul, Gunungkidul, Sleman, Yogyakarta, Pacitan, Ponorogo, Pasuruan, Mojokerto, Bojonegoro, Lombok.
NEIC reported an aftershock of M 4.9 in Bali, Indonesia was felt with intensity II-III in the area(s) of Bali, Indonesia in Kuta.
News sources reported the quake injured at least 10 people while one person died of a heart attack during the quake.
The associated shaking caused minor damage to hundreds of residences, offices and health and school facilites
mainly in Yogyakarta and Central Java. No tsunami was expected or observed with
This earthquake may have been triggered by SFE from flare #6340 which was ending
simultaneously with this earthquake ...
This is the strongest earthquake within about 200 km of this epicenter in
Java since an M 6.1 on January 25, 2014. The last event of M>=6.4
in this area occurred more than 35 years ago." (June 30, 2023)
Today's earthquake occurred within about an hour of local solar midnight and may have
been promoted by geomagnetic effects which maximize near this hour." (February 5, 2026)
Today's earthquake was also near local solar noon and may have been promoted
by tidal and/or geomagnetic stresses.
In addition to being nearly antipodal to the earthquakes in Venezuela this epicenter
is also at the seventh node (52 degrees) from TS Higos and may have been
promoted by energy from those sources (see above for more details).
Two minor earthquakes in the area south of Java were almost exactly antipodal
to the M 7.2 and M 7.5 earthquakes in Venezuela. This area could see continued
enhanced seismicity in the coming days.
O: 27JUN2026 07:47:21 9.0S 111.2E ML=5.6 BMG SOUTH OF JAVA, INDONESIA
O: 27JUN2026 07:47:23 9.0S 111.2E ML=5.2 NEIC SOUTH OF JAVA, INDONESIA
EMSC reported an earthquake of M 4.2 west of Gibraltar was felt with intensity up to IV in the area(s) of west of Gibraltar in Lagoa, Portugal.
The last earthquake within about 150 km of this epicenter west of Gibraltar
with M>=4.2 occurred as an M 4.5 on September 19, 2022. An M 5.4 on August 25, 2024
about 200 km north of today's epicenter was discussed in this summary
at the time as:
"A moderately strong earthquake of M 5.4 was widely felt in Portugal today. It occurred
near the antipode of an earlier M 6.9 in Tonga and may have been related to
antipodal focusing of seismic energy at the antipode of that epicenter. NEIC reported
the earthquake in Portugal was felt with maximum intensity VII in Lisbon, Portugal at Benedita Lisboa e Vale do Tejo and VI in Portugal at Ponte Norte, Sines Alenteho with V in Trafaria Lisboa e Vale do Tejo, Santa Barbara de Nexe, Monte Redondo, Moita, Loures, Castro, Carregado, Bucelas, Bombarral, Arrentela, Alferrarede, Lisbon, and with lesser shaking throughout Portugal and portions of Spain.
EMSC reported a possible minor tsunami with maximum shaking in Portugal near the
towns of Sines, Zambujal de Cima, with a great deal of noise. Euro Weekly News reported no major damage or injuries with this earthquake.
The last earthquake located near Portugal with M>=5.4 occurred more than 35 years ago. The only
comparable event in the past 35 years occurred with M 5.4-5.5 on December 17, 2009 and January 10, 2006." (August 26, 2024)
Today's epicenter is at 103 degrees from Typhoon Mekkhala and TS Higos and
near 60 degrees (node 6) from Venezuela and the third node (120 degrees) from
Mindanao and Sulawesi and was likely promoted by constructive energy interference
from those sources.
O: 28JUN2026 06:59:41 36.7N 9.8W ML=4.2 EMSC WEST OF GIBRALTAR
EMSC reported an earthquake of M 4.7 south of Africa was not felt in this remote area.
This epicenter is at 103 degrees from the earthquakes in Venezuela and
was probably promoted by energy from those sources.
O: 28JUN2026 08:34:26 52.7S 27.6E MB=4.7 EMSC SOUTH OF AFRICA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
There are no tropical cyclones currently active
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of June 27, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
2270 0622 0626 0628 C2.3 (June 27, 2026) 1.0E-03
Guatemala M 3.9 06:24 UT
Antofagasta M 4.4 06:36 UT
2300 0648 0654 0717 C2.1 (June 27, 2026) 3.9E-03
2310 0717 0727 0744 C2.2 (June 27, 2026) 3.7E-03
Java M 5.6 07:47 UT
2340 0908 0923 0941 C3.9 (June 27, 2026) 6.8E-03
2370 1046 1053 1055 C3.1 (June 27, 2026) 1.7E-03
Central California M 2.5 10:47 UT
Banda Sea M 5.9 10:37 UT
2390 1214 1221 1226 C2.9 (June 27, 2026) 2.1E-03
Java M 2.6 12:14 UT
Fiji M 4.5 12:35 UT
2430 1509 1516 1525 C1.9 (June 27, 2026) 1.9E-03
2560 2053 2102 2106 C7.4 (June 27, 2026) 6.8E-03
Fiji M 4.1 Fiji 20:59 UT
2580 2106 2111 2113 C7.4 (June 27, 2026) 4.3E-03
Sunda Strait M 5.1 21:10 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active June 28 and June 30 quiet June 29. Solar M-flare chance: 50% X-class: 10% proton storm: 5%
AP Indicies: global: 7, high: 8, mid-latitude: 8, time of max k: 00:00-08:00 UT; Max k: 3 Global Kp 2.67 0000-0200, June 27; Sunspot Number: 119; Radio Flux: 188
June 27, 2026
Notable earthquakes and events:
At 163 the 10.7 cm Radio Flux was the strongest in the past month. This may contributed
to elevated seismicity in the world today. A proton and electron flux storm
began about 16:30 UT on June 27 and could help promote additional enhanced
seismic activity especially near 65W (local solar noon) and possibly
115E (local solar midnight) in the hours after that. On June 26 the GOES
18 magnetometer showed a strong enhancement in the local magnetic field beginning abouot 20:00 UT
which required an arcjet maneuver at 20:10 UT to correct the position of that satellite.
No significant geomagnetic storms occurred on June 26. The highest Hp30 (Kp) value on June 26
from GFZ was reached with 4.3 around 19:30-20:00 UT.
O: 26JUN2026 20:08:03 5.6N 125.4E ML=4.6 NEIC MINDANAO, PHILIPPINES
O: 26JUN2026 19:56:42 51.0N 159.1E ML=4.5 EMSC KAMCHATKA
An earthquake of M 5.6 (BKMG) occurred today in the area south of Java, Indonesia.
BMG reported it was felt with intensity III in Pacifan, Wonogiri, Tulungagung, Blitar and II in Kulon Progo, Bantul, Sleman, Yogyakarta, Trenggalek, Malang, Nganjuk, Magetan, Klaten, Ponorogo and Jember, Java, Indonesia.
NEIC reported intensity IV in Yogyakarta, Indonesia at Jetis and III in Yogyakarta and
Wonosari and in Java at Prambanan and Surakarta with lesser shaking in Madiun, and in Yogyakarta at Depok and Kasihan.
EMSC reported strong shaking in Indonesia at Gondang, Sewon, Yogyakarta, and Madiun City.
GOES Magnetometers showed strong enhancement of the geomagnetic field
beginning at about 06:30 UT and lasting till about 07:15 UT. This may
have helped promoted this earthquake in Java.
This earthquake south of Java is within about 150 km of being exactly antipodal to the M 7.2 and M 7.5
in Venezuela of June 25, 2026 and was probably promoted by antipodal
seismic waves from that event. In the previous issue of this summary
it had been anticipated as:
"Because of its M 7.5 size the earthquake in Venezuela is likely to trigger
far-field aftershocks. When an M 7.3 earthquake occurred on August 21, 2018
in eastern Venezuela it was followed on September 29, 2018 by an M 7.5 in
the area of Sulawesi, so the antipodal nature of these areas is well established
by previous data. The exact antipode of today's epicenter is at 10S 111E
an area south of Java, Indonesia. This is a seismic region and was showing
a number of minor earthquake associated with solar flares today and could
see a strong or major event in the next several weeks." (June 25, 2026)
Earthquakes of M 5.8 and M 5.7 hit this area of Java on February 5 and January 27, 2026.
At the time this summary noted:
"The strongest earthquake in the world today was an M 5.8 (EMSC) to 6.4 (BMG) in Java, Indonesia. NEIC reported it was felt with maximum intensity V in Java at Jatiroto, Gondanglegi and in Yogyakarta at Pendong, Depok and Sweon with IV in Java at Jaten, Kediri, Magelang, Kanigoro, Surakarta, Mlati, and III in Driyorego, Grogol, and II in Grogol, Tabanan, Bandung, Karawang and Degangan.
EMSC reported strong shaking in Java at Sudimoro, Pacitan, Wonogiri, Karanganyar, Temenggungan, Klampok, Madiun, Bambanglipuro, Pugeran Maguwoharjo, Gampengrego, Yogyakarta, Surakarta, Depok Kasihan Me.ati amonther others where it woke many.
The last earthquake within about 200 km of this epicenter with M>=5.8 occurred
on June 30, 2023 with M 5.8. At the time this summary noted:
"A strong earthquake of M 5.8-6.4 shook the region of Java, Indonesia today.
BMG reported this earthquake of M 6.4 in Java, Indonesia was felt with intensity II-III in the area(s) of Java, Indonesia with VI in Pracimantoro, Wonogiri, Java, Pacitan; V in Wonogiri, Gunungkidul, Kebumen, Purworejo, Mageland, Kulon Progo, Bantul, Gunungkidul, Sleman, Yogyakarta, Pacitan, Ponorogo, Pasuruan, Mojokerto, Bojonegoro, Lombok.
NEIC reported an aftershock of M 4.9 in Bali, Indonesia was felt with intensity II-III in the area(s) of Bali, Indonesia in Kuta.
News sources reported the quake injured at least 10 people while one person died of a heart attack during the quake.
The associated shaking caused minor damage to hundreds of residences, offices and health and school facilites
mainly in Yogyakarta and Central Java. No tsunami was expected or observed with
This earthquake may have been triggered by SFE from flare #6340 which was ending
simultaneously with this earthquake ...
This is the strongest earthquake within about 200 km of this epicenter in
Java since an M 6.1 on January 25, 2014. The last event of M>=6.4
in this area occurred more than 35 years ago." (June 30, 2023)
Today's earthquake occurred within about an hour of local solar midnight and may have
been promoted by geomagnetic effects which maximize near this hour." (February 5, 2026)
Today's earthquake was also near local solar noon and may have been promoted
by tidal and/or geomagnetic stresses.
In addition to being antipodal to the earthquakes in Venezuela this epicenter
is also at the seventh node (52 degrees) from TS Higos and may have been
promoted by energy from those sources (see above for more details).
O: 27JUN2026 07:47:21 9.0S 111.2E ML=5.6 BMG SOUTH OF JAVA, INDONESIA
O: 27JUN2026 07:47:23 9.0S 111.2E ML=5.2 NEIC SOUTH OF JAVA, INDONESIA
With the antipodal (to Venezeula) event of M 5.2-5.6 today south of Java, Indonesia
it is prudent to reexamine the last earthquake in Venezuela of the size
(M 7.5) of the event of June 25. This earthquake occurred on March 26, 1812 and
was associated in time with major earthquakes in New Madrid, Missouri (M 8.1)
and in the Los Angeles, California (December 8, 1812 and December 21, 1812 M 7.0) region of the same year.
What is not often associated with that event in Venezuela was a major
eruption of Tambora Volcano at 9S 118E east of Java in 1815. This is considered
by many geoscientists as the greatest volcanic eruption in modern times.
It released enough gas and particulate matter to darken the earth's skies
for several years after and caused the "year without summer" in 1816 when temperatures
in many areas dropped by significant amounts due to the sky darkening
from that volcanic eruption. This eruption began in 1812 when the "volcano
began to rumble and generated a dark cloud" (Wikipedia and Stothers, 2004, Density of fallen ash after the eruption of Tambora in 1815. Jurnal of Volcanology and Geothermal Research 134 (4), 343-345.
As Tambora is very near the antipode of the
1812 earthquake in Venezuela it is likely this volcanic activity in
Indonesia was promoted by seismic effects from the earthquake in Venezuela.
The last eruption of Tambora occurred on June 20, 2026.
The area of Sumatra and Java east to Sumba in Indonesia is highly volcanic
and many of the greatest recent volcanic eruption have occurred in this
region (including Krakatoa at 6S 105E in the Sunda arc) which experienced
a similar catastrophic eruption sequence from May to October, 1883 also causing global climate and
temperature drops due to the emitted ash cloud. The antipode of Krakatoa
is in Colombia at 6N 75W, another active seismic area. One of the strongest
earthquakes recorded in Colombia was an M 8.0 at 7N 77W on September 7, 1882
months before the eruption at Krakatoa began and very near the antipode
of that volcano. The only other event in Colombia of M>=8 in the historical
catalog was an M 8.2 on June 18, 1826. Krakatoa is currently experience a major period of unrest and
regional geoscientists consider a major eruption is possible at this time
or in the near future.
This brief glimpse into some of the major historical events in Colombia and
Venezuela and subsequent volcanism in the Sunda arc of Venezuela suggests
that the expected seismic regime of that area is likely to see a major
volcanic eruption in the next months as well as the possibility of a
moderately large to large earthquake near the antipode of the Venezuelan
earthquakes. Such an eruption would likely have major consequences in the
near term on global weather and temperatures as seen in 1812-1815 and
in 1882-1883. Mount Merapi in Central Java is an active volcano and is near
the antipode to the Venezuelan earthquakes. Signs of such a pending eruption should be carefully monitored
in coming days.
A moderately strong earthquake occurred today in the area of Tokyo, Japan with
M 5.7. This follows an M 5.8 to the east of this epicenter which was reported
in the last issue of this summary. Today's event occurred near local solar
midnight and was reported by NEIC to have been widely felt in Honshu with intensity V-VI in Shizuoka, Kanagawa, Yamanashi, Tokyo, Japan at Fujisawa, Nirasaki, Ebina, Sagamihara, Kodaira, Hakone, Kofu, Fujiyoshida, Atsugi, Gotemba.
EMSC reported strong shaking in Japan at Hachioji, Zama, Chigasaki, Inagi, Fujisawa, Tokorozawa, Yokohama, Kawasaki, Nishitokyo, Tokyo, Yokosuka, Kawaguchi, Ichikawa-minami, Urayasu, Miyoshi, and as far as 175 km from the epicenter.
The last earthquake within about 150 km of this epicenter in Honshu, Japan
with M>=5.7 occurred on October 7, 2021 with M 5.9. At the time this summary noted:
"The strongest earthquake felt in the world today was an M 5.9 in the region of southeastern Honshu, Japan near Tokyo. NEIC reported it was felt with maximum intensity V in Chiba and Tokyo, Japan at Chiba, Ichihara, Funabashi, Narashino, Yotsukaido, Urayasu, Yachiyo, Ichikawa, Kamagaya, Sakura among others.
As noted, when an M 5.6 hit north of this in northern Honshu Japan, in the previous issue of this summary, this earthquake was probably
promoted by the passage of Typhoon Mindulle east of this several days ago as:
"Super Typhoon Mindulle (TS 20W) continued in the area east of Honshu, Japan today with winds up to 70 kts. This system is moving to the northeast and is currently south of eastern Honshu, Japan. It is expected to track north reaching areas south of Honshu, Japan this week. Major seismic enhancement is possible in the area of Central and eastern Honshu in the next several days as this storm passes to the east." (October 2-3, 2021)
Today's event is the first within about 150 km of Tokyo, Japan with M>=5.9
in more than an year - since an M 5.9 on June 24, 2020. The last event of
larger magnitude in this area was an M 6.2 five years ago on September 23, 2106." (October 7, 2021)
It appears that today's event in Tokyo was also triggered by strong regional
ocean Storms. Typhoon Mekkhala and Tropical Storm Higos merged today
at the same time and location as the M 5.7 quake in Honshu, Japan. Stresses from these storms
had been expected to bring enhanced seismicity to the area as noted in this summary:
"TS HIGOS 2026-06-27 00:00 UT 36.0N 140.0E 55 kts Eastern Honshu, Japan
TS Higos (TD 08W) continued today south of eastern Honshu, Japan with winds up to 55 kts. It is expected to track to the northeast over the next day possibly enhancing seismicity in eastern and northern areas of Honshu, Japan at this time. The antipode is at 35S 40W in the southern Atlantic and is not a seismic area.
and
TYP MEKKHALA 2026-06-27 00:00 UT 35.5N 140.0E 50 kts Southeastern Honshu, Japan
TS Mekkhala (TD 07W) merged today with TS Higos today in the area of southeastern Honshu, Japan near Tokyo with winds up to 50-55 kts. These storms are expected to dissipate today but remnants may track to the northeast over the next day. This storm could help promote enhanced seismicity in the area of Tokyo, and northern areas of eastern Honshu, Japan. The antipode is at 35S 40W in Brazil is not a seismic area." (June 26-27, 2026)
This epicenter is at 51.4 degrees (node 7) from the North Geomagnetic Pole
and may have been promoted by energy from that source.
O: 26JUN2026 13:29:01 35.5N 138.9E ML=5.7 NEIC SOUTHEASTERN HONSHU, JAPAN
NEIC reported an earthquake of M 3.1 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in Clio, Downieville, Sierra City, B lairsden-Graeagle, Portola, Goodyears Bar, Quincy, and II in Susanville, Truckee and Gardnerville, Nevada.
O: 27JUN2026 07:30:48 39.8N 120.7W ML=3.1 NEIC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 4.9 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaskan with IV in Homer and III in Anchor Point, Seward, Sterling, Soldotna, Clam Gulch, Ninilchik, Kasilof, Anchorage, Cooper Landing and II in Kenai, Girdwood, Wasilla, Moose Pass, Chugiak, Eagle River.
This epicenter is at the fourth node (90 degrees) from Sulawesi and at 105 degrees from
Antofagasta Chile and my have been promoted by energy from those sources.
O: 27JUN2026 01:15:31 60.1N 151.3W ML=4.9 NEIC SOUTHERN ALASKA
NEIC reported an earthquake of M 4.1 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaskan in Anchorage, Eagle River, Kenai, Moose Pass, Palmer, Seward, Kasilof, Chugiak, Cooper Landing, Elmendorf AFB, Wasilla, Homer, Soldotna, Willow.
EMSC reported moderate shaking in Anchorage, Girdwood and Eagle River, with moderate shaking in Knik-Fairview, Gateway, Lakes, Palmer and Farm Loop.
O: 27JUN2026 05:25:52 61.0N 150.1W ML=4.2 NEIC SOUTHERN ALASKA
NEIC reported continuing aftershocks in the Redwood Valley area of Northern California today with of M 2.5 in Northern California was felt with intensity up to II-III in the area(s) of Northern California in Redwood Valley and Kelseyville.
O: 27JUN2026 04:47:34 39.3N 123.2W ML=2.5 NEIC NORTHERN CALIFORNIA
NEIC reported earthquakes of M 5.4 and M 5.2 in Pakistan was felt with intensity up to II-III in the area(s) of Pakistan with VII in Barkhan.
These epicenters are at the third node (120 degrees) from Venezuela and near the
sixth node (60 degrees) from the North Geomagnetic Pole, Mindanao, Sulawesi, Honshu, and
Tropical Storm Higos and may have been promoted by constructive interference
of energy from those sources.
O: 27JUN2026 03:06:21 30.5N 69.7E ML=5.4 NEIC PAKISTAN
O: 26JUN2026 11:48:47 30.4N 69.6E ML=5.2 NEIC PAKISTAN
NEIC reported an earthquake of M 4.7 in Venezuela was felt with intensity up to II-III in the area(s) of Venezuela with IV in Turmero, and III in Caracas, Los Dos Caminos, Miranda, Palo Negro, Baruta, Valencia, Carrizal, Guarenas, El Cafetal, San Antonio de los Altos.
EMSC reported strong shaking in Venezuela at El Consejo, El Limon, Mariara, Maracay, Puerto Cabello, Turmero, Sant Rita, San Joaquin, among others. It was felt as far as 300 km from the epicenter.
Tolls from the M 7.2 and M 7.5 quakes of June 25 continued to rise. More than
300 have been confirmed dead due to that earthquake with thousands missing
and presumed dead. At least 30 building were completely destroyed and collapsed.
Relief workers will clarify additional details in coming days.
O: 26JUN2026 22:16:11 10.8N 67.6W ML=4.7 NEIC VENEZUELA
Aftershocks in Mindanao Philippiines also continued today. The strongest of these
occurred as an M 6.5, the strongest aftershock of the M 7.8 of June 7, 2026 since
an M 6.5 on June 8, 2026. NEIC reported today's earthquake was felt with intensity VI in souothern Mindanao at San Jose, Kiamba, Klinan; V in Maitum, Conel, Maan, Katangawan, Silway, Buayan, Banga, IV in Padada, Pag-asa. Koronadal, Barra, Davao, and III in Manado, Sulawesi, Indonesia among others.
This event lies on the geomagnetic equator at a position which was exactly
at local solar noon when a strong geomagnetic excursion was recorded on
GOES satellites. This was reported in the previous issue of this summary as:
"A strong excursion in the the strength of the geomagnetic field measured by the GOES-19
magnetometer increasing the measured strength of the field from about 70 nT
at 03:42 UT to 120 nT at 03:48 UT on June 26, 2026. This continued until about
05:09 UT when a sudden drop in the recorded magnetic field occurred. The position
of the satellite was corrected with an arcjet maneuver at about 03:45 UT and
normal recording resumed about 05:20 UT. The GOES-18 magnetometer showed
a similar increase in the magnetic field peaking at about 03:45 UT." (June 26, 2026)
NEIC reported an earthquake of M 4.6 in Mindanao was felt with intensity up to II-III in the area(s) of
This earthquake may have been promoted by a strong geomagnetic change
at the time of the event as recorded on GOES Satellite magnetometers (see above).
O: 26JUN2026 20:08:03 5.6N 125.4E ML=4.6 NEIC MINDANAO, PHILIPPINES
NEIC reported earthquakes of M 2.8 and M 2.8 in Southern California were felt with intensity up to II-III in the area(s) of Southern California with III in Thousand Palms, Rancho Mirage and II in La Quinta, Chula Vista, Palm Desert, Indio and Palm Springs.
O: 26JUN2026 16:36:33 33.9N 116.2W ML=2.8 NEIC SOUTHERN CALIFORNIA
NEIC reported an earthquake of M 5.0 in the Dominican Republic was felt with intensity up to II-III in the area(s) of the Dominican Republic with IV in Puerto Rico at Utuado, III in Anasco, Aguada, San Juan, Guaynabo, Arroyo, and Rincon.
EMSC reported moderate shaking in the Dominican Republic at La Romana, Punta Cana, Salvaleon de Higuey, Otra Banda, Hato Mayo del Rey, Boca Chica, Guerra, Santo Domingo, and in Puerto Rico in Mayaguez among others. It
was reported as far as 300 km from the epicenter.
This earthquake occurred within minutes of local solar noon at a latitude
which was near sub-solar at the time and may have been promoted by tidal
and/or geomagnetic stresses. The last earthquake in the Dominican Republic
within about 200 km of this epicenter with M>=5 occurred as an M 5.7 on August 5, 2025 and
one year ago on June 24, 2025 also with M 5.7. At the time this summary noted:
"An M 5.7 earthquake was widely felt in the areas of the Dominican Republic and Puerto Rico today. NEIC reported maximum intensity IV in Puerto Rico at Adjuntas, Aguada, Auadilla, Cabo Rojo, Utuado and III in Anasco, Arecibo, Camuy, Barceloneta and Castaner.
An M 4.5 aftershock occurred which was felt with loud rumbling in Dominican Republic at Otra Banda and Punta Cana and strongly in Ponce, Puerto Rico (EMSC data).
A foreshock of M 3.9 was felt with intensity IV in Otra Banda Dominican Republic and III in Puerto Rico at Ponce, Cayey, San Juan, Guaynabo, and Carolina.
This event occurred near local solar midnight and may have been promoted by
tidal and/or geomagnetic stresses which maximize near this hour. The epicenter
is near sub-solar at this time of June. This has not been lost to this
audience in the past several days as it was reported:
"Because of its location near the Tropic of Capricorn, Mexico is no stranger to
major earthquakes near the summer solstice when the sun is directly overhead.
Such events occurred in 1897 (M 7.0); 1916 (M 7.1); 1928 (M 8.0) and 1982 (M 7.2)
among others. This relation had been noted in the previous issues of this report as:
"On the first day of summer in the northern hemisphere, the sun reaches its zenith at about 23 degree North latitude
due to the tilt of the earth's axis. Vertical tidal triggering is therefore
maximized near 23 North latitude at this time of year. Seismicity can be
seen to increase at this latitude as well as evidenced by today's India earthquake at 23 North
latitude ... (June 22, 2020, June 19, 2025, June 24, 2025)
This epicenter is at the third node (120 degrees) from Tropical Storm Higos
and may have been promoted by energy from that source.
O: 26JUN2026 16:06:49 17.9N 68.2W ML=5.0 NEIC DOMINICAN REPUBLIC
NEIC reported an earthquake of M 5.2 in Nicaragua was felt with intensity up to II-III in the area(s) of Nicaragua in Casatepe, Diriamba, Managua, Tola Rivas and in Santa Cruz, Costa Rica and Ayutuxtepeque, San Salvador, El Salvador.
EMSC reported moderate to strong shaking in Nicaragua at Ciudad Sandino, Managua, Nagarote, and as far from the epicenter 125 km at Juigalpa.
This epicenter is at 144 degrees from Mindanao and may have been promoted by energy
from that source.
O: 26JUN2026 11:57:25 12.0N 86.5W ML=5.2 NEIC NICARAGUA
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM HIGOS (DEPRESSION 08W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS HIGOS 2026-06-27 00:00 UT 36.0N 140.0E 55 kts Eastern Honshu, Japan
TS Higos (TD 08W) continued today south of eastern Honshu, Japan with winds up to 55 kts. It is expected to track to the northeast over the next day possibly enhancing seismicity in eastern and northern areas of Honshu, Japan at this time. The antipode is at 35S 40W in the southern Atlantic and is not a seismic area.
TYPHOON MEKKHALA (07W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TYP MEKKHALA 2026-06-27 00:00 UT 35.5N 140.0E 50 kts Southeastern Honshu, Japan
TS Mekkhala (TD 07W) merged today with TS Higos today in the area of southeastern Honshu, Japan near Tokyo with winds up to 50-55 kts. These storms are expected to dissipate today but remnants may track to the northeast over the next day. This storm could help promote enhanced seismicity in the area of Tokyo, and northern areas of eastern Honshu, Japan. The antipode is at 35S 40W in Brazil is not a seismic area.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of June 26, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
2100 1223 1248 1304 C5.7 (June 26, 2026) 1.0E-02
2110 1346 1353 1357 C1.7 (June 26, 2026) 1.4E-03
Sulawesi M 5.0 13:47 UT
2170 1357 1404 1409 C3.5 (June 26, 2026) 2.2E-03
Mindanao M 4.3 14:02 UT
2130 1452 1501 1508 C2.0 (June 26, 2026) 1.7E-03
2190 2012 2021 2028 C2.4 (June 26, 2026) 2.1E-03
Mindanao M 4.6 20:08 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active June 27-28 quiet June 29. Solar M-flare chance: 50% X-class: 10% proton storm: 5%
AP Indicies: global: 11, high: 15, mid-latitude: 13, time of max k: 15:00-18:00 UT; Max k: 4 Global Kp 3.00 1800-2200, June 26; Sunspot Number: 99; Radio Flux: 163
June 26, 2026
Notable earthquakes and events:
The sun was at its most active in the past month. With Radio flux at 10.7 cn of 156 greater
than any in the past 30 days. The sunspot number of 136 today also was the most since June 6 when it reached 139.
A strong excursion in the strength of the geomagnetic field measured by the GOES-19
magnetometer increasing the measured strength of the field from about 70 nT
at 03:42 UT to 120 nT at 03:48 UT on June 26, 2026. This continued until about
05:09 UT when a sudden drop in the recorded magnetic field occurred. The position
of the satellite was corrected with an arcjet maneuver at about 03:45 UT and
normal recording resumed about 05:20 UT. The GOES-18 magnetometer showed
a similar increase in the magnetic field peaking at about 03:45 UT.
The strongest earthquake of the day occurred near Tokyo, Japan with M 5.8.
This event occurred simultaneously with the strong geomagnetic field excursioni
seen on GOES 18 and 19 satellite magnetometers (see above) and may have been
triggered by it. EMSC reported the earthquake was felt with moderate to strong intensity
in Japan at Kamagaya, Ichikawa-minami, Urayasu, Tokyo, Kawasaki, Toda, Yokosuka, Tokorozawa.
NEIC reported intensity IV in Chiba and Saitama and III i nKanagawa, Ibaraki, Tokyo, Shizuoka, Tochigi, Shizuoka Prefectures.
This sequence began with an M 4.1 minutes earlier. That earthquake was
reported by EMSC to have been felt lightly in Urayasu, Chiba. It occurred
within a couple of minutes of local solar noon and was likely triggered
by geomagnetic effects which maximize near this hour. A strong increase in
the electron flux at GOES satellites accompanied these geomagnetic and seismic
events starting about 02:40 UT and maximizing about 03:40 UT. Proton flux
and solar flare activity remained quiet during this time. Anomalous behavior
of the solar wind also appears to have maximized around 03:45 UT along with
a minor increase in the Hp30 index to 3.33.
The last earthquake with M>=5.8 within about 150 km of this epicenter near
Tokyo, Japan was recorded on March 14, 2012 and more recently on May 26, 2023 with M 6.1. At the time this summary noted:
"An M 6.1-6.2 earthquake shook the area of Japan near Tokyo today. NEIC reported it was felt
with maximum intensity VI in Chiba, IV in Ibaraki, Saitama, Kanagawa, Tokyo, with lesser shaking in Gunma, Tochigi, Shizuoka, Miyagi, Niigata, Aichi Prefectures.
JMA reported intensity IV (Japanese scale) throughout much of the area of
southeastern Honshu, Japan. An aftershock of M 4.9 was reported by NEIC to have been felt with intensity III in Chiba and IV in Kochi Prefectures, Japan.
This forced a number of bulet trains to stop
operations temporarily. A series of earthquakes have occurred in this region
of Japan in the past two weeks of M 5.0-5.5 and may have been precursory
to today's event. This included an M 5.2 in Chiba Prefecture of May 11, 2023 which
injured at least five elderly people in Chiba and two others in Kanagawa Prefecture
while doing minor damage to buildings and roofing. At the time this summary noted
in this regard:
"A moderate earthquake of M 5.2 was widely felt in the region of Tokyo, Japan today. NEIC reported maximum intensity V in Chiba and Kanagawa Prefectures with IV in Tokyo, Saitama, and lesser shaking in Ibaraki and Shizuoka Prefectures, Japan.
It caused several injuries to elderly people and minor damage to buildings.
The last earthquake within about 200 km of this epicenter near Tokyo, Japan
with M>=5.2 was an M 5.0 on October 7, 2021. At the time this summary note
in this regard:
"Today's event is the first within about 150 km of Tokyo, Japan with M>=5.9
in more than an year - since an M 5.9 on June 24, 2020. The last event of
larger magnitude in this area was an M 6.2 five years ago on September 23, 2016." (October 7, 2021)
... This activity is located at the seventh node (51.5 degrees) from the major earthquake in Tajikistan of M 7.2 on February 23, 2023
and may have been promoted by energy from that source." (May 11, 2023)
Typhoon Mawar is currently south of this epicenter. Mawar is the strongest
typhoon to hit the region of Guam and the Mariana Islands in more than two
decades and could have influenced the timing of today's earthquake in Japan.
In previous issues this summary had noted in this regard:
"Typhoon Mawar (02W) continued today in the area of west of Guam with winds up to 165 kts. It is expected to track to the northwest reaching Taiwan around May 31 as a typhoon with winds up to 165 kts. It is likely that a moderate to strong earthquake could occur near Guam or Taiwan or Southern Japan with this storm in the next week. This appears to be the strongest typhoon to hit Guam in the past two decades." (May 25-27, 2023)
Today's earthquake of M 6.1 is the strongest to hit the region within about 150 km
of Tokyo since an M 6.2 on September 23, 2016 an event also accompanied by
a strong typhoon. The last of M>6.2 in this region
occurred as aftershocks of the M 7.9-9.3 earthquake and tsunami of March 11, 2011.
On September 23, 2016 this summary noted:
"This area has been relatively quiet at M>=6 since the great
earthquakes of March, 2011, but did not rupture in those events and probably
is still capable of a major earthquake. The last earthquake of M>=6.3 within
about 150 km of this epicenter was an M 6.4 on January 19, 2005 and prior to that
an M 6.3 on May 29, 2004, the only such earthquakes in the area in the past
25 years, making this a regionally significant earthquake." (September 23, 2016)
A great earthquake with M>9 hit near this epicenter on May 27, 1293 - 830 years ago today.
It, and an accompanying tsunami reportedly killed more than 22,000" (May 26, 2023)
Another factor which may have helped promoted seismicity in the area of Tokyo
Japan today was the presence of Tropical Storm Higos to the south. This summary
noted this storm as:
"TS HIGOS 2026-06-26 00:00 UT 30.0N 138.6E 55 kts Eastern Honshu, Japan
TS Higos (TD 08W) continued today south of eastern Honshu, Japan with winds up to 55 kts. It is expected to track to the northeast over the next day possibly enhancing seismicity in eastern Honshu, Japan in this time. The antipode is at 33S 42W in the southern Atlantic and is not a seismic area." (June 26, 2026)
O: 26JUN2026 03:46:36 35.7N 140.4E ML=5.8 EMSC SOUTHEAST HONSHU, JAPAN
O: 26JUN2026 03:46:35 35.6N 140.5E ML=5.8 EMSC SOUTHEAST HONSHU, JAPAN
O: 26JUN2026 02:49:30 36.1N 139.9E ML=4.1 EMSC SOUTHEAST HONSHU, JAPAN
NEIC reported earthquakes of M 2.6 and M 2.9 in Washington State were felt with intensity up to II-III in the area(s) of Washington State in North Bend, CleElum, Redmond, Thorp and Sammamish.
O: 26JUN2026 08:06:54 47.6N 121.8W ML=2.6 NEIC WASHINGTON STATE
O: 26JUN2026 05:31:29 47.2N 121.2W ML=2.9 NEIC WASHINGTON STATE
NEIC reported an earthquake of M 3.1 in Central Alaska was felt with intensity up to II-III in the area(s) of Fairbanks, Fort Wainwright, North Pole.
O: 26JUN2026 05:23:10 64.8N 147.4W ML=3.1 NEIC CENTRAL ALASKA
NEIC reported an earthquake of M 4.4 in Northern Venezuela was felt with intensity up to II-III in the area(s) of Northern Venezuela in La Dolorita, Miranda.
EMSC reported moderate to strong shaking in Venezuela at Farriar, Bejuma, San Felipe, Naguanagua, Independencia, San Diego, Tocuyito, Valencia, Los Guayos, San Joaquin, El Limon, Maracay, Santa Rita, Palo Negro, Turmero, Santa Cruz among others.
This earthquake occurred near local solar midnight and may have been
promoted by geomagnetic and/or tidal stresses.
O: 26JUN2026 04:19:30 10.5N 68.4W ML=4.4 NEIC NORTHERN VENEZUELA
NEIC reported earthquakes of M 3.5 and M 2.6 in Nevada were felt with intensity up to II-III in the area(s) of Nevada near Indian Springs.
O: 25JUN2026 23:10:25 36.7N 115.8W ML=3.5 NEIC NEVADA
O: 25JUN2026 21:33:56 36.7N 115.8W ML=2.6 NEIC NEVADA
NEIC reported an earthquake of M 4.9 in Fox Islands, Aleutians, Alaska. was felt with intensity up to II-III in the area(s) of Fox Islands near Nikolski.
NEIC reported an earthquake of M 5.0 in northern Mindanao, Philippines was felt with intensity up to II-III in the area(s) of northern Mindanao, Philippines in Caraga at Brasilisa and Dapa.
O: 25JUN2026 21:17:49 9.9N 127.0E ML=5.0 NEIC MINDANAO, PHILIPPINES
NEIC reported an earthquake of M 3.1 in Hawaii was felt with intensity up to II-III in the area(s) of Hawaii in Kealakekua, Captain Cook, Kailua Kona, Lahaina, Kamuela, Naalehu, Hilo and Honaunau and Pahoa.
O: 25JUN2026 18:34:27 19.3N 155.9E ML=3.1 NEIC HAWAII
NEIC reported an earthquake of M 2.6 in Utah was felt with intensity up to II-III in the area(s) of Utah in Hyrum, Logan, Hyde Park, Syracuse, Providence.
O: 25JUN2026 12:52:54 41.7N 111.7W ML=2.6 NEIC UTAH
NEIC reported an earthquake of M 4.6 in Guadeloupe was felt with intensity up to II-III in the area(s) of Guadeloupe.
O: 26JUN2026 08:23:04 16.6N 59.6W ML=4.6 NEIC GUADELOUPE
EMSC reported an earthquake of M 3.7 south of Java, Indonesia was felt with intensity up to IV in the area(s) of south of Java, Indonesia.
O: 26JUN2026 03:22:18 10.6S 113.0E ML=3.7 EMSC SOUTH OF JAVA, INDONESIA
EMSC reported an earthquake of M 4.0 in Eastern Turkey was felt with intensity up to IV in the area(s) of Eastern Turkey in Colakli, Malatya, Adiyaman, Elazig, Rize, and in Aleppo, Syria.
O: 25JUN2026 13:22:36 38.3N 38.6E ML=4.0 EMSC EASTERN TURKEY
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM HIGOS (DEPRESSION 08W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS HIGOS 2026-06-26 00:00 UT 30.0N 138.6E 55 kts Eastern Honshu, Japan
TS Higos (TD 08W) continued today south of eastern Honshu, Japan with winds up to 55 kts. It is expected to track to the northeast over the next day possibly enhancing seismicity in eastern Honshu, Japan in this time. The antipode is at 33S 42W in the southern Atlantic and is not a seismic area.
TYPHOON MEKKHALA (07W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TYP MEKKHALA 2026-06-26 00:00 UT 28.0N 128.0E 45 kts Ryukyu Islands
TS Mekkhala (TD 07W) continued today in the Ryukyu Islands with winds up to 45 kts. It is expected to track to the northeast over the next day south of Honshu, Japan. This storm could help promote enhanced seismicity in Ryukyu Islands and Honshu, Japan in the next several days. The antipode is at 28S 52W in Brazil is not a seismic area.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of June 25, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
1760 0237 0254 0303 C4.0 (June 25, 2026) 5.2E-03
Gulf of Aden M 5.1 03:53 UT
1750 0015 0022 0029 C4.3 (June 25, 2026) 3.6E-03
1770 0532 0547 0552 C2.1 (June 25, 2026) 2.2E-03
Venezuela M 4.4 05:48 UT
1790 0757 0803 0814 C1.6 (June 25, 2026) 1.7E-03
Nayarit, Mexico M 3.4, 3.5 07:57, 07:59 UT
1820 0858 0905 0915 C2.2 (June 25, 2026) 1.9E-03
1830 1327 1331 1334 C2.7 (June 25, 2026) 1.3E-03
1840 1453 1503 1507 C6.6 (June 25, 2026) 3.5E-03
1900 2111 2114 2116 C2.3 (June 25, 2026) 9.0E-04
Mindanao M 5.0 21:17 UT
1910 2155 2202 2214 C2.0 (June 25, 2026) 2.1E-03
1950 2335 2348 2351 C5.0 (June 25, 2026) 3.1E-03
Virgin Islands M 4.0 23:35 UT
Mindanao M 4.2 23:55 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active June 26-28. Solar M-flare chance: 50% X-class: 10% proton storm: 5%
AP Indicies: global: 25, high: 36, mid-latitude: 29, time of max k: 15:00-18:00 UT; Max k: 6 Global Kp 5.67 0200-0400, June 25; Sunspot Number: 136; Radio Flux: 156
June 25, 2026
Notable earthquakes and events:
An earthquake of M 5.6 occurred on June 24 in northern California about 100
km north of San Francisco. NEIC reported it was widely felt throughout northern California with intensity VI in Redwood Valley, Potter Valley, Willits; V in Upper Lake, Nice, Ukiah, Kelseyville, Lakeport, Boonville, Manchester, and as far as San Francisco and Sacramento and
areas to the south. At M 5.6 this is the strongest earthquake within the State
of California (not including offshore events) within about 200 km of today's
epicenter since an M 6.0 on August 24, 2014 about 150 km to the southeast of
today's epicenter. Today's earthquake occurred at 103 degrees from the M 7.8
in Mindanao, Philippines of June 7, 2026 and was expected as a far-field aftershock
of that event as:
"... Far-field aftershocks area also likely. The distance near 103 degrees from Mindanao passes through central and
Southern California. In 1992 the Landers quake in southern California (M 7.6) hit a month after the M 7.3 quake
in Mindanao near this distance and was probably promoted from it. Other areas
near 103 degrees from today's epicenter in the Philippines include Sicily, Iceland and
portions of northwestern U.S as well as the Antarctic and East Pacific Rise. Areas at
144 degrees or nearby include the northern Caribbean, Panama and southern Chile as well
as portions of the Central Mid-Atlantic ridge. These areas are particularly
prone to seismic enhancement at this time. ..." (December 29, 2018)
It may be of interest to note that this epicenter is at 101 degrees from
the M 6.2 in southern Italy of June 2, 2026 and near the antipode of
the M 6.9 in Antofagasta, Chile of May 25 and may have been promoted
by energy from those sources. Likewise, the earthquake in Southern Italy (the strongest earthquake since the event in Chile in the world)
occurred at 101 degrees from Antofagasta, Chile.
But the symmetry continues. The earthquake in Italy occurred 7 days and one hour after
the event in Chile while the event in Mindanao occurred 6 days and one hour
after the quake in Italy, the strongest in the world prior to the event in
Mindanao. ..." (June 7, 2026)
and
"P- and S- shadow zone edge and node 7 (101-110 degrees)
Mindanao to California, Nevada, Greenland, Iceland, Italy, Idaho, Southern, Geysers, Central California, Yellowstone, South of Africa, Scotland, Iceland, southern Idaho, San Francisco, Mammoth Lakes, CA, Los Angeles, California, Montana, Oregon, Tyrrhenian Sea, Italy, France, Central, northern California, " (June 7, 2026)
Earthquakes of M 5.5 and M 5.7 hit the area about 200 km northeast
of today's epicenter on May 11, 2023 and May 24, 2013. At that time this summary noted:
"The strongest earthquake in the U.S. or Canada today was an 5.5 in Northern California. NEIC reported this earthquake was widely felt in northern California and Nevada with maximum intensity VI in Westwood, Chester and Greenville, Californa, V in Twain, Mineral, California and IV in Quincy Meadow Valley, Forest Ranch, Janesville and Magalia and Taylorsville and II-III in Forest Ranch, Mineral, Janesville, Magalia, Comptonville, Chico and as far as Reno and Las Vegas, Nevada and in southern Oregon.
This epicenter is near the fifth node (72 degrees) from the M 7.6 in Tonga yesterday.
This possibility had been addressed in the previous issue of this summary
...
The only event within about 150 km of today's epicenter with M>=5.5 in the
past 35 years was an M 5.7 on May 24, 2013 within about 10 km of today's
epicenter. It, like today's event, followed an M 7.4 in Tonga of May 23, 2013.
At the time this summary noted:
"A moderately strong earthquake of M 5.7 hit northern California today
and was felt throughout most of the states of California, Nevada and Oregon.
Maximum intensity in Nevada occurred with intensity III in Reno, Sparks, Virginia
City, Carson City among many others. In California the maximum intensity
was listed by NEIC as VII. This occurred in the Greenville and Twain areas.
Intensity V was felt out to about 100 km from the epicenter; IV to about 150
km and III within about 200 km of the quake. A good deal of minor damage
occurred in the epicentral area as windows broke and items fell and were
thrown about by the shaking. There were no immediate reports of major damage. In Oregon the maximum intensity
occurred with III at Klamath Falls, Bonanza and Lakeview.
...
A strong aftershock sequence is continuing in the area and many of the
events of M>3 are being felt with intensity III-IV. This is the largest
earthquake to hit northern or central California, Nevada or Oregon in
19 years - since an M 6.1 on the California-Nevada border on September 12, 1994.
The Klamath Falls quake of September 21, 1993 was a pair of M 6.0 and 6.1
quakes was the last similar event in this region within 200 km of the epicenter.
The last significant earthquake within 100 km of the epicenter was the
M 5.7 Oroville Dam earthquake of August 1, 1975." (May 24, 2013, May 12, 2023)
Today's earthquake in Northern California occurred at the start of the strongest geomagnetic storm of the
past week. The Hp30 index shows the Kp value reached
4.0 for the first time in a week at 15:00-15:30 UT simultaneously with the time the earthquake
in northern California occurred.
This earthquake also coincided with a C3.8 solar flare, the strongest of the
day. Data for this flare shows it just past maximum output when the earthquake
in California occurred. Data from SWPC for this flare follow.
Flare # START MAX END CLASS DATE Flux (Jm-2)
1650 1428 1441 1515 C3.8 (June 24, 2026) 4.4E-03 *
Northern California M 5.5 15:10 UT
Mindanao M 4.0 14:28 UT
South of Java M 2.9 14:27 UT
In addition to being at 103 degrees from Mindanao, Philippines this epicenter
is at the fourth node (90 degrees) from Typhoon Mekkhala - described as the
strongest early season typhoon in the past five years. This may have been the
final triggering straw for this earthquake in Northern California.
O: 24JUN2026 15:30:38 39.3N 123.2W MD=2.2 EMSC NORTHERN CALIFORNIA
O: 24JUN2026 15:31:38 39.3N 123.2W MD=2.1 EMSC NORTHERN CALIFORNIA
O: 24JUN2026 15:49:58 39.3N 123.2W MD=2.0 EMSC NORTHERN CALIFORNIA
O: 24JUN2026 17:47:12 39.3N 123.2W MD=2.8 EMSC NORTHERN CALIFORNIA
O: 24JUN2026 15:10:41 39.4N 123.2W Mw=5.5 EMSC NORTHERN CALIFORNIA
O: 24JUN2026 15:10:41 39.4N 123.2W Mw=5.6 NEIC NORTHERN CALIFORNIA
O: 24JUN2026 15:17:28 39.4N 123.2W MD=2.5 EMSC NORTHERN CALIFORNIA
O: 24JUN2026 15:33:50 39.4N 123.2W MD=2.0 EMSC NORTHERN CALIFORNIA
O: 24JUN2026 16:06:42 39.4N 123.3W MD=2.7 EMSC NORTHERN CALIFORNIA
O: 24JUN2026 17:05:28 39.4N 123.2W MD=2.4 EMSC NORTHERN CALIFORNIA
O: 24JUN2026 17:54:27 39.4N 123.2W MD=2.1 EMSC NORTHERN CALIFORNIA
O: 24JUN2026 17:58:22 39.4N 123.2W MD=2.7 EMSC NORTHERN CALIFORNIA
O: 24JUN2026 22:01:37 39.4N 123.2W MD=2.1 EMSC NORTHERN CALIFORNIA
O: 24JUN2026 23:07:06 39.4N 123.2W MD=2.8 EMSC NORTHERN CALIFORNIA
The strongest geomagnetic storm in the past two weeks occurred late in the
UT June 25, 2026 day. Estimated planetary Kp reached a value of 4.0
from 22:00-24:00 UT on June 24. This is the first time the Kp value
has eaced 5 or above since it was 4.33 late on June 11, 2026. This storm
continued on into June 25, 2026 reach Kp of 5 between around 0300 and 0600 UT.
The last geomagnetic storm of greater disturbance was on June 6, 2026 when Kp briefly
reached 6.0. The commencement of this storm appears to have begun around 22:00 UT when the Hp30 value
from GFZ reached 4. That index reached maximum of 5.66 at 03:30-04:00 UT on June 24.
A moderate solar flare also coincided with the commencement of this storm.
Data on this C2.6 solar flare (#1720) from SWPC follow.
Flare # START MAX END CLASS DATE Flux (Jm-2)
1720 2202 2215 2232 C2.6 (June 24, 2026) 4.4E-03
Honshu M 6.9 22:30 UT
Venezuela M 7.1 22:04 UT, M 7.5 22:06 UT
El Salvador M 3.9 22:11 UT
Northern California M 2.1 22:02 UT
Veracruz, Mexico M 3.5 22:01 UT
The combined effect of the geomagnetic storm, a major typhoon (Mekkhala) and
the solar flare may have been enough of a nudge to trigger major earthquakes
in Venezuela and northern Honshu which coincided with the flare and geomagnetic
storm.
A major earthquake of M 7.5 hit northern Venezuela and was accompanied by an M 7.2 foreshock
39 seconds earlier. NEIC reported it was felt with intensity IX (major damage) in Venezuela at Goaigoaza, Carabolo and VIII in Caucaguita, Mirand and in Moron, Carabolo (considerable damage).
Intensity VII was reported from Venezuela at Tinaquillo, Charallave, Caracas, Chacao, El Cafetal, Turmero, Baruta, Petare, San Antonio de los Altos, La Dolorita, Guanare, Guatire, El Limon and in Miami, Florida. Intensity VI was felt in Venezuela at Guarenas, Guacara, Valencia, Palo Negro, Nirgua, Ocumare del Tuy, Acarigua, Carrizal, Anaco, El Hatillo, Las Teyerias with lesser shaking throughout Venezuela, Colombia, Brazil, Puerto Rico, Netherlands Antilles, Guyana, Dominican Republic, Bolivia, Cuba, Florida, Aruba, Saint Lucia, Turks and Caicos Islands, among others.
EMSC reported horrible and major shaking in Venezuela at San Felipe, Valencia, Naguanagua, San Diego, Los Guayos, Guacara, Ducaca, Barquismieto Low Rastrojos, El Limon, Cabudare, among others and moderate shaking as far as 1000 km from the epicenter in Guyana, Guadeloupt, Martinique, Puerto Rico, Dominican Republic, Colombia, Trinidad and Tobago, Aruba, Saint Eustatius and Saba,Curacao,
An aftershock of M 4.4 to the east of the mainshocks in Venezuela occurred later in the day.
EMSC reported it was felt with strong shaking in Venezuela at Guatire, La Dolorita, Petare, Los Dos Caminos, El Hatillo, El Cafetal, Chacao, Caracas, Baruta, San Antonio de Los Altos, Caricuao, San Jose de Barlovento, Los Teques, La Victoria, Anaco, Maturin.
Press reports from BBC indicated an initial death toll in the earthquake of at least 32 with
building destroyed in the states of Caracas and La Guaira. Because the figures
do not include the worst-hit areas of La Guaira and Caracas, it is likely
that tolls will rise considerably. Thousands were probably injured in these
two quakes. Schools and services were suspended for the immediate future.
The last earthquake in Venezuela within about 300 km of today's epicenters
with M>=7.5 was an M 7.4-8.0 on October 29, 1900 and an M 7.7 (or greater)
on March 26, 1812. This summary reported damage from the October, 1900 event as:
"10 29 8 42 0 1900 10.900 -66.800 50 7.4 No. Venezuela
Severe damage occurred at Caracas, Quarenas, Tacarigua and Brochico, Venezuela. Maximum intensity was XIII." (October 29, 2025)
and damage from the event of March 26, 1812 as:
" 3 26 21 7 0 1812 10.000 -67.000 25 8.6 No. Venezuela
A great earthquake and tsunami hit the City of Merida de Caracaybo. The shock hit Caracas and the surrounding countryside, particularly in the high mountains of Merida and as far as Cartegena in the Andes." (March 26, 2025)
Two strong earthquakes occurred west of today's epicenter with M 6.2 and M 6.3
on September 24 and 25, 2025. At the time this summary noted:
"Seismicity today was dominated by a series of moderately strong to strong
earthquakes in the region of Northern Venezuela (M 5.8, 6.2, 6.3). These
may have been locally damaging and are the strongest in this region of
Venezuela in at least 35 years. Activity at the antipode in Java and Bali,
Indonesia showed enhancement shortly thereafter with an M 4.9-5.7 south of Bali.
...
A pair of strong earthquakes has occurred in northern Venezuela near Trujillo. These events of M 6.3 and M 6.2 were widely felt in the epicentral area. NEIC reported some damage in the Aragua area of Venezuela with intensity IV in Cagua, La Victoria, Barinas, and Valencia and III in Aruba at Oranjestad and in Venezuela at Barcelona, El Limon, Palo Negro, Guacara and Puerto ls Cruz.
The initial shock of M 6.2 was also reported by NEIC with intensity V in La Victoria and IV in Palo Negro, Barinas, San Carlos, and II-III in San Fernando, El Limon, Tacarigua, Velencia and Barcelona Venezuela and in Aruba.
EMSC included reports of strong shaking in Venezuela at Ciudad Ojeda, San Francisoc, Tabay, Alto Barinas, Barquisimeto, Cabudare, Los Rastrojos, Sinamaica, Punto Fijo, Bejuma, San Cristobal, Cucuta, Valencia, Maracay, Villa de Cura, Caricuao, Caracas, El Hatillo, Chacao, Los Dos Caminos, La Dolorita with moderate shaking in Colombia at Dibulla, Floridablanca, San Fil, Puerto Colomgia, Turbaco Itagui, Envigado, La Estrella, Barrio San Luis, Bogota, Dosquebradas, and as far as Ciudad Guayana nearly 900 km from the epicenter.
EMSC reported strong shaking with the M 5.8 aftershock in Venezuela and Zulia at Cabimas, Maracaibo, Barquisimeto, El Toro, Carrizal, Caracas, Charallave, Maracay and in Colombia at Santa Marta, Cucuta, Santander,
No tsunami threat was identified with these land-based earthquakes.
These are the strongest earthquakes in Venezuela or the southern Caribbean
within about 300 km of this epicenter in at least 35 years. The only earthquake
in this area since 1990 of M>=6 was an M 6.0 on May 31, 1994. The last moderate
earthquake of M>=5.0 in the area was an M 5.0 on July 25, 2024.
This epicenter is at 103.6 degrees from the M 7.8 in Kamchatka of September 18
and had been expected in this summary to be active at this time as:
"P- and S- shadow zone edge and node 7 (101-110 degrees)
Kamchatka to Panama, Colombia, Guadeloupe, South Indian Ocean, So. New Zealand, South of Australia, Macquarie Is, Leeward Is, Caribbean, East Pacific Rise, Galapagos, " (September 19, 2025, September 25, 2025)
Like the events of October, 2025 in Venezuela today's events are at 103-104 degrees
from the M 8.8 in Kamchatka of July 29, 2025 and the subsequent M 7.4 on September
13, 2025. These great earthquakes probably set the area up for today's
unprecedented earthquakes.
This epicenter in Venezuela is also in the antipodal zone from the strong M 6.7 in Minahassa.
Sulawesi, Indonesia of June 16, 2026. At the time this summary noted this
in the far-field aftershock forecast as:
"Antipodal (~180 degrees)
Minahasa to northern Brazil" (June 16, 2026)
This epicenter is also at 144 degrees from the landfall in the Ryukyu Islands
of Japan of Typhoon Mekkhala, the first major typhoon of the current season.
It is likely that energy from this typhoon landfall helped trigger the simultaneous
earthquakes in Northern Venezuela.
The last earthquake in northern Venezuela of M>=7.0 occurred more than a century ago.
Because of its M 7.5 size the earthquake in Venezuela is likely to trigger
far-field aftershocks. When an M 7.3 earthquake occurred on August 21, 2018
in eastern Venezuela it was followd on September 29, 2018 by an M 7.5 in
the area of Sulawesi, so the antipodal nature of these areas is well established
by previous data. The exact antipode of today's epicenter is at 10S 111E
an area south of Java, Indonesia. This is a seismic region and was showing
a number of minor earthquake associated with solar flares today and could
see a strong or major event in the next several weeks.
Following is a preliminary list of areas considered most likely to be affected
by energy from the earthquake in Venezuela.
DISTANCE RELATIONS BETWEEN EARTHQUAKES
Statistical evidence indicates that some triggering or promotion forward in time can occur in regions which are under high stress due to additional stress events of small size. Among these are surface and body waves passing through a region. Triggering may be dynamic with the promoted earthquake occurring at the same time as the stress event or delayed with an earthquake occurring later in time but still related to the stress event through water lubrication or other various geophysical effects on the faults. We have argued in this report for the past 35 years that this effect is most observable where the seismic waves are largest. In general this occurs at distances from the rupture ends of the earthquake producing those waves (mainshock) which we have termed nodal distances. These are defined by the formula D=360*m/n where D is the distance in degrees and m<=m where n an m are small integers. These are also the locations of the maximum corrections to magnitude in the standard Jeffreys-Bullen tables. In addition there is focusing of seismic energy from reflections and refractions of f the core-mantle and the inner-outer core boundary of the earth. This focuses energy at the surface in the distance between 101 and 108 degrees (core-mantle) and 141-148 degrees (inner-outer core boundary). In this report we monitor seismicity at these distances following major earthquakes as experience has shown that strong and/or unusual earthquake are much more likely to occur at these distance from the mainshock.
Antipodal (~180 degrees)
Venezuela to Sumba, Minahasa, Sumbawa, Java, Lombok, Indonesia,
Outer shadow zone edge (141-148 degrees)
Venezuela to New Britain, Ryukyu Islands, Taiwan, Papua New Guinea, Myanmar, Guam, Mariana Is., South Indian Ridge,
Node 3 (120 degrees)
Venezuela to Hindu Kush, Afghanistan, Pakistan, Northern Honshu, Hokkaido, Southern Kurils, Gulf of Aden, South Island, New Zealand,
P- and S- shadow zone edge and node 7 (101-110 degrees)
Venezuela to Caucasus, eastern Iran, Kamchatka, Samoa,
Node 4 (90 degrees)
Venezuela to Crimea, Ukraine, Andreanof Is,
Node 5 (72 degrees)
Venezuela to Southern Alaska, South Shetland Islands, South Sandwich Is, Niger, Gabon, Italy,
Node 6 (60 degrees)
Venezuela to Vancouver, coast of Oregon, Spain, Portugal,
Node 7 (52 degrees)
Venezuela to southern California, northern mid-Atlantic, Central Mid-Atlantic,
Node 8 (45 degrees)
Venezuela to western Texas, Coquimbo, Chile, Gulf of California, Azores
In addition to being near the antipode of Sulawesi, at 103 degrees from the
great quakes in Kamchatka and at 144 degrees from Typhoon Mekkhala, this
epicenter in Venezuela is also at the third node from northern Honshu, Japan
where an M 7.4 occurred on April 20, 2026. An aftershock followed in that
area of Japan minutes after the Venezuelan events and was probably triggered
by an SkS wave from Venezuela. This is discussed in more detail below.
O: 24JUN2026 22:05:11 10.4N 68.5W ML=7.5 NEIC NORTHERN VENEZUELA
O: 24JUN2026 22:05:11 10.4N 68.4W MW=7.5 EMSC CARABOBO, VENEZUELA
O: 24JUN2026 22:04:32 10.5N 68.5W Mw=7.2 EMSC YARACUY, VENEZUELA
O: 24JUN2026 22:04:33 10.4N 68.5W ML=7.2 NEIC NORTHERN VENEZUELA
O: 25JUN2026 05:48:23 10.5N 66.5W ML=4.4 NEIC NORTHERN VENEZUELA
O: 24JUN2026 22:23:54 10.6N 66.7W MB=4.5 EMSC VARGAS, VENEZUELA
O: 25JUN2026 05:48:23 10.5N 66.5W mb=4.4 EMSC MIRANDA, VENEZUELA
A major earthquake occurred 25 minutes and 45 seconds after the initial M 7.2 in Venezuela in the area of
northern Honshu, Japan with M 6.9. NEIC reported it was felt in northern Honshu, Japan
with intensity VII in Aomori Prefecture at Misawa, Hachinohe; VI in Morioka, Iwate; V in Aomori and Kitakami, Iwate, IV in Otfuke, Hokkaido with intensity
III in Sendai, Miyaga, Uayasu, Chiba, Kanagawa, Saitama, Ibaraki, Fukushima, Tochigi, Tokyo, Yamagata, Gunma, and possibly as far as Shizuoka Prefecture.
This event was likely triggered by the SkSac reflected S-wave off the core
boundary, the strongest returning wave at this distance from that event in
Venezuela. Travel time tables show this wave would have reached the surface
at the 122 degree distance between Venezuela and the northern Honshu epicenter
after 25 minutes and 45 seconds following the Venezuelan mainshock. This
wave probably trigger the subsequent earthquake in northern Honshu, Japan.
This is the strongest earthquake in Northern Honshu, Japan since an M 7.4
on April 20, 2026 and prior to that an M 7.6 on December 8, 2026 and is
the strongest aftershock to date of that activity. At the time this summary
noted:
"A major M 7.4 earthquake occurred today off the northeast coast of Honshu, Japan.
NEIC reported intensity VII in Miyako, Iwate; VI in Hachinohe, Aomori, and Hasama, Miyagi and V in Misawa Aomori with IV in Hokkaido at Hakodate, Kitahiroshima, Namie, Fukushima, Tagajo, Miyagi, Narita, Chiba and Shiogama, Miyagi, Japan.
EMSC reported strong shaking in Japan at Aomori, Sendai, Noda, Sanriku coast, Chiba, Kamagaya, Toda, Urayasu, Tokyo, Kawasaki, Yokohama.
JMA reported the quake was felt with intensity up to VI on the Japanese Scale (out of 7)
in the areas of Hasikami, Aomori Prefecture and V in Iwate and Miyagi Prefectures. Sanriku, Iwate Prefecture. A tsunami warning has been issued by JMA
Possible tsunami waves up to 3 meters may occur in the Japanese areas of Hokkaido,
Miyagi, Fukushima and Aomori. The earthquake occurred in an area of a number of
nuclear power plants including Fukushima Daiichi and Daini in the Tokyo area
and Onagawa in Miyagi and Higashidori in Aomori Prefecture. Residents of
Japan are warned to avoid coastal areas at this time due to possible strong
currents and tidal waves. The last strong earthquake near today's epicenter
occurred as an M 6.5 on March 26. 2026. At the time this summary noted:
The earthquake off Honshu, Japan today occurred as a moderately strong
geomagnetic storm was commencing. The GOES-19 magnetometer shows this storm
beginning at about 07:20 UT on April 20 but a geomagnetic variation may have
started several hours earlier. The GOES-19 satellite position
had to be corrected with an arcjet maneuver due to this storm at 07:34 UT.
At this writing this storm has reached High latitude K of 6. It is likely
that this geomagnetic storm commencement helped promote this earthquake at
this time. The second strongest aftershock (M 5.4) at the time of this writing also was closely
associated with a major geomagnetic field variation recorded on GOES-19 and GOES-18 magnetometers.
This involved a near doubling of field intensity starting near 50 nT around 04:40 UT
and reaching a maximum near 100 nT at 05:30 UT on both GOES Magnetometers.
The M 5.4 aftershock occurred precisely at the peak of this field change
and may have been promoted by it. This aftershock was reported felt with intensity
up to III in the region of Miyako, Japan." (April 20, 2026)
Today's earthquake in Honshu, Japan occurred as Typhoon Mekkhala was making
landfall in the Ryukyu Islands of southern Japan and may have been affected
by stresses propagating north from this source. It is also at 103 degrees
from the South Geomagnetic Pole and at the eighth node (45 degrees) from the north
goemagnetic pole and Sulawesi, Indonesia and may have been promoted
by constructive interference of energy from those sources.
Expected far-field seismicity enhancement after today's northern Honshu earthquake:
Antipodal (180 degrees)
Japan to South Atlantic
Outer shadow zone edge (142-150 degrees)
Japan to Northern Chile, Central/South Atlantic, West Chile Rise, South Shetland Islands
Node 3 (120 degrees)
Japan to Dominican Republic and Virgin Islands Venezuela, Galapagos, Antarctic-Pacific Ridge, Canary Is,
Inner shadow zone edge (101-108 degrees)
Japan to Chiapas, Oaxaca, Mexico, Azores,
Node 4 (90 degrees)
Japan to Central Mediterranean, Ethiopia, South Island, New Zealand, New Madrid, West Texas, Jalisco, Mexico
Node 9 (80 degrees)
Japan to Turkey, Baja California
Node 5 (72 degrees)
Japan to central, northern California, Iceland, Eastern Turkey, Iran, Caucasus, Fiji, Tonga,
Node 6 (60 degrees)
Japan to Vanuatu, Vancouver, Sumatra,
Node 7 (51.4 degrees)
Japan to Eastern Alaska, Yukon Canada, Banda Sea, New Guinea
Node 8 (45 degrees)
Japan to Indonesia, Myanmar, southern Alaska," (December 8, 2025)
This activity is at the third node (120 degrees) from Venezuela and may have
been triggered by energy from that source (see above for details).
O: 24JUN2026 22:30:14 40.3N 142.1E ML=6.9 EMSC NORTHERN HONSHU, JAPAN
O: 25JUN2026 00:33:56 40.5N 142.2E ML=4.0 EMSC NEAR EAST COAST OF HONSHU,
O: 24JUN2026 22:30:15 40.3N 142.2E Mw=6.9 EMSC NEAR EAST COAST OF HONSHU,
O: 25JUN2026 01:11:30 40.3N 142.3E ML=4.0 EMSC NEAR EAST COAST OF HONSHU,
NEIC reported earthquakes of M 2.6 and M 3.4 off the coast of northern California ere felt with intensity up to II-III in the area(s) of northern California in Petrolia.
O: 25JUN2026 04:25:47 40.3N 124.6W ML=3.4 NEIC OFF COAST OF NORTHERN CALIFORNIA
O: 25JUN2026 04:25:47 40.3N 124.6W ML=3.4 EMSC OFFSHORE NORTHERN CALIFORNIA
O: 25JUN2026 04:36:33 40.3N 124.5W MD=2.2 EMSC OFFSHORE NORTHERN CALIFORNIA
O: 25JUN2026 05:21:56 40.3N 124.4W MD=2.1 EMSC OFFSHORE NORTHERN CALIFORNIA
O: 24JUN2026 12:16:52 40.4N 125.2W ML=2.6 NEIC OFF COAST OF NORTHERN CALIFORNIA
NEIC reported an earthquake of M 3.6 in Hawaii was felt with intensity up to II-III in the area(s) of Hawaii in Volcano, Hakalau, Mountain View, Kurtistown, Pepeekeo, Papaikou, Pahoa, Ookala, Hilo, Keaau, Honolulu, Laupahoehoe, Kailua Kona, Holualoa, Honomu.
O: 24JUN2026 18:29:37 19.3N 155.2W ML=3.6 NEIC HAWAII
O: 24JUN2026 18:29:37 19.3N 155.2W ML=3.7 EMSC ISLAND OF HAWAII, HAWAII
NEIC reported an earthquake of M 4.3 in Tajikistan was felt with intensity up to II-III in the area(s) of Tajikistan in Kirgili Farg'ona.
EMSC reported it was felt with moderate intensity in Uzbekistan at Fergana, Toshloq, Oliariq, Kyzyldzhar, Tuytepa, Bektemir, Salor, Tashkent, and in Kyrgyzstan at Aravan, Osh.
O: 24JUN2026 16:07:02 40.3N 71.9E ML=4.3 NEIC TAJIKISTAN
O: 24JUN2026 16:07:01 40.3N 71.9E MB=4.3 EMSC EASTERN UZBEKISTAN
NEIC reported an earthquake of M 2.9 in Northern California was felt with intensity up to II-III in the area(s) of Northern California near Manton.
O: 24JUN2026 11:02:31 40.3N 121.9W ML=2.9 NEIC NORTHERN CALIFORNIA
O: 24JUN2026 11:02:31 40.4N 121.9W MD=2.9 EMSC NORTHERN CALIFORNIA
NEIC reported an earthquake of M 4.9 in the Dodecanese Islands, Greece was felt with intensity up to II-III in the area(s) of the Dodecanese Islands, Greece with IV in Karpathos and II in Dafni and Rodos, Greece.
EMSC reported it was felt with light intensity in Greece at Karpathos, Fry, Palekastro, Rodos, Gazi, Keratsini and in Datca, Turkey and Polis, Cyprus.
O: 24JUN2026 08:25:54 35.2N 27.2E ML=4.9 NEIC DODECANESE ISLANDS, GREECE
O: 24JUN2026 08:25:56 35.3N 27.2E MB=4.9 EMSC DODECANESE ISLANDS, GREECE
EMSC reported an earthquake of M 4.9 in Mindanao, Philippines was felt with intensity up to IV in the area(s) of Mindanao, Philippines in General Santos City.
O: 25JUN2026 04:03:41 5.3N 125.2E ML=4.9 EMSC MINDANAO, PHILIPPINES
EMSC reported an earthquake of M 4.5 in Coquimbo, Chile was felt with intensity up to IV in the area(s) of Coquimbo, Chile in La Serena, Coquimbo, Vicuna.
O: 24JUN2026 10:36:33 29.8S 71.2W ML=4.5 EMSC COQUIMBO, CHILE
SEISMIC EFFECTS OF TROPICAL CYCLONES
Some seismicity may be affected by weather due to wind, tidal surge and air pressure systems effects of the continental mass compared with adjoining plate masses. During the tropical storm season in the Northern Hemisphere we keep an eye on tropical storms which may affect seismicity according to our models. Currently the following tropical storms appear to have potential to affect seismicity in the coming week:
TROPICAL STORM HIGOS (DEPRESSION 08W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TS HIGOS 2026-06-25 00:00 UT 17.8N 137.6E 50 kts Northern Marianas
TS Higos (TD 08W) continued today in the northern Mariana Islands west of Guam with winds up to 50 kts. It is expected to track to the northwest over the next several days possibly enhancing seismicity in the Mariana Islands and Guam in this time. The antipode is at 18S 42W in the southern Atlantic and is not a seismic area.
TYPHOON MEKKHALA (07W)
---- ------- ---------- -------- ----- ------ ------- ---------------
TYP MEKKHALA 2026-06-25 00:00 UT 23.6N 124.7E 85 kts Ryukyu Islands
TS Mekkhala (TD 07W) continued today in the Ryukyu Islands with winds up to 85 kts. It is expected to track to the northeast over the next day east of the northern Philippines. This storm could help promote enhanced seismicity in the Philippines, Taiwan and the Ryukyu Islands, Japan in the next several days. The antipode is at 24S 57W in Brazil is not a seismic area.
SOLAR FLARES
Following is the listing of C- M- or X-class flares from SWPC for the date
of June 24, 2026. These listings are published daily in this summary and at SWPC.
The main line gives details of flares. Subsequent lines identify some earthquakes
which are at or after the time of the flare and could have been affected by
immediate Solar Flare Effects (SFE). Some earthquakes occur at longitudes
which were at local solar noon or local solar midnight when a flare occurred and may also have
been affected by SFE. These are not identified here.
SOLAR FLARES
Flare # START MAX END CLASS DATE Flux (Jm-2)
-------------------------------------------------------------------------
XXXX 0237 0254 0303 C4.0 (June 25, 2026) 5.2E-03
Gulf of Aden M 5.1 03:53 UT
1560 0034 0104 0111 C3.5 (June 24, 2026) 5.7E-03
Chiapas M 4.1 00:33 UT
1570 0344 0353 0359 C2.7 (June 24, 2026) 2.4E-03
Myanmar M 4.3 03:58 UT
1580 0640 0651 0657 C2.6 (June 24, 2026) 2.4E-03
1590 0707 0711 0715 C3.5 (June 24, 2026) 1.5E-03
1610 0856 0903 0908 C1.9 (June 24, 2026) 1.5E-03
Argentina M 4.5 08:57 UT
Azores M 3.5 09:02 UT
1640 0908 0911 0915 C1.8 (June 24, 2026) 9.5E-04
1620 0958 1003 1009 C1.8 (June 24, 2026) 1.2E-03
Chiapas M 4.0 09:59 UT
South of Java M 3.1 10:02 UT
North coast of Colombia M 3.8 10:02 UT
1650 1428 1441 1515 C3.8 (June 24, 2026) 4.4E-03
Northern California M 5.5 15:10 UT
Mindanao M 4.0 14:28 UT
South of Java M 2.9 14:27 UT
1670 1608 1615 1617 C2.7 (June 24, 2026) 1.1E-03
Uzbekistan M 4.4 16:07 UT
Central Peru M 4.6 16:25 UT
1690 1832 1842 1847 C2.5 (June 24, 2026) 2.0E-03
Costa Rica M 4.0 18:38 UT
Java M 3.5 18:45 UT
Hawaii M 3.7 18:30 UT
1700 2022 2031 2042 C1.4 (June 24, 2026) 1.6E-03
Java M 3.1 20:30 UT
1720 2202 2215 2232 C2.6 (June 24, 2026) 4.4E-03
Honshu M 6.9 22:30 UT
Venezuela M 7.1 22:04 UT, M 7.5 22:06 UT
El Salvador M 3.9 22:11 UT
Northern California M 2.1 22:02 UT
Veracruz, Mexico M 3.5 22:01 UT
*indicates modified reading from NOAA GOES Graph
GEOMAGNETIC FIELD: active June 25-27. Solar M-flare chance: 50% X-class: 10% proton storm: 5%
AP Indicies: global: 15, high: 16, mid-latitude: 11, time of max k: 15:00-19:00 UT; Max k: 4 Global Kp 4.00 2200-2400, June 24; Sunspot Number: 126; Radio Flux: 137
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