April 23, 2025

 

The strongest earthquake in the world today was an M 6.2 (EMSC) to M 6.6 (BMG) event in North Sulawesi,

Indonesia. NEIC reported it was felt with intensity III  in Southern Mindanao, Philippines at Sugal, Katangawan, Davao, Buayan, Bato, Polonuling and in Manado Sulawesi, Indonesia. PHIVOLCS reported intensity IV in City of Mati, Davao Oriental and III in Jose Abad Santos, Malungon, Sarangani; City of General Santos, Pantukan, Davao de Oro with lesser shaking in Davao Occidental and Oriental, South Cotabato, Sultan Kudarat and Davao de Oro. It was at a shallow focus and caused buildings to sway, alarms to go off

and minor damage throughout the epicentral area according to news sources. Many people

fled their homes with minor injuries common. No tsunami was expected nor

observed with this earthquake. The last earthquake of M>=6.2 within about 150

km of today's epicenter occurred on January 8, 2024 with M 6.7. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.7-6.8 in the Talaud Islands. NEIC reported it was felt with intensity up to VI in Sarangani, Philippines.

PHIVOLCS reported it was felt with intensity IV in Sarangani, Davao Occidental; Glan, Kiamba and Malungon, Sarangani and III in Nabunturan and Pantukan, Davao de Oro, City of Digos, Davao Del Sur; City of Davao, Don Marcelino an dJHose Abad Santos, Davao Occidental; Matalam, Cotabato, Alabel and Malapatan, Sarangani; City of Koronadal, Polomolok, T'Boli, and Tupi, South Cotabato and City of General Santos and with lesser intensity in Zamboanga, Sultan Kudarat.

BMG reported this event with M 7.0 was felt with intensity IV in Sangihe, Tabukan, Marore, and in Talaud at Lirung, Beo, Rainis, Essang, Nanusa, Kabaruan, Melonguane, Gemeh, Damau, Salibabu, Kalongan, Miangas, Pulutan, Moronge, and III in Sangihe at Manganitu, Tatoareng, Tamako, Manganitu, Tabukan Tengah, Kendahe, Tahuna, Siau, Tagulandang, Biaro.

Aftershocks of M 5.3 and M 5.1 were also felt with light to moderate intensity in the Talaud area

according to data from BMG. This epicenter is near the 11th node from the M 7.5 in Honshu,

Japan of January 1, 2024 (32.7 degrees) and may have been promoted by

energy from that source as well as from other strong earthquakes in the area

of Mindanao over the past two months.

 

Today's earthquake is the strongest within about 200 km of this epicenter

since an M 7.0 on January 21, 2021. At the time this summary noted:

 

 

"Today's event (in Mindanao) is the strongest within about 200 km of this epicenter since an

M 7.0 on December 29, 2018. The last of larger magnitude was an M 7.2 about 200

km southwest of this on February 11, 2009.  ...

 

The coast of California is near 103 degrees from the epicenter of this earthquake in the Philippines and

may see enhanced seismicity related to incoming energy from this source

in the near future." (January 21, 2021, January 8, 2024)

 

 

This event occurred as the strongest solar

flare of the day (SWPC #8050) was reaching its peak. Following is the flare data

for this event from SWPC:

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

8050       1000*  1049      1134   M1.3      (April 22, 2025)   6.3E-02  

Talaud M 6.2-6.6 10:17 UT

South of Java M 5.7 10:14 UT

Seram M 4.9 10:15 UT

Honshu M 3.9 11:38 UT

 

Forecast 171341 had expected today's event in Talaud was likely within about 100

km of this epicenter around April 18.

 

O: 22APR2025 10:17:13  4.5N 127.8E ML=6.2  NEIC   Sulawesi, Indonesia    

O: 22APR2025 10:17:13  4.3N 127.5E ML=6.6  BMG    Sulawesi, Indonesia    

P: 18APR2025 171341    4.0N 129.0W 4.0-5.4 BAAAA  Halmahera  

 

The M 6.2-6.6 in Talaud/Sulawesi was accompanied by an M 5.7 south of Java, Indonesia several minutes earlier as well as an M 4.9 in Ceram, Indonesia.

NEIC reported this event was felt with intensity III in Java at Karawang and in Serpong, Banten and II in Bandung, Depok, Sukabumi and lightly in Jakarta and Cikeruh, Indonesia.

Forecast 171362 had expected this earthquake in Java was likely within

about 100 km around April 20, 2025.

 

O: 22APR2025 10:14:02  8.3S 106.7E ML=5.7  NEIC   South of Java,  Indonesia    

O: 22APR2025 10:14:02  8.3S 106.7E ML=5.7  BMG    Sulawesi, Indonesia    

P: 20APR2025 171362    7.0S 107.0E 4.0-5.4 ABAAA  South of Java

 

The events in M 5.7, 6.2-6.6 and M 4.9 occurred within about three minutes

and were apparently triggered by SFE associated with the strongest

solar flare of the day (#8050 - see above).

 

This appears to break the 5-day global seismicity quiet which began shortly

at a major geomagnetic storm hit on April 16. The likely seismic effects of this storm

were reviewed  in this summary in the previous two issues as:

 

 

"A severe geomagnetic storm began today about 16:00 UT (April 16). It reached

maximum Planetary Kp of 8 around 22:00-23:00 UT. The last geomagnetic storm

of greater disturbance occurred on January 1, 2025 with A-index (planetary)

of 86. Today's AP index reached 77. A major earthquake of M 7.1 followed the January 1, 2025 storm

on January 7, 2025 in the area of Xizang, China. Severe storms of this

type can trigger enhanced seismicity at the time of commencement (see previous

issue of this summary) or after ring currents re-develop up to a week after

the initiation of the storm.  Strong earthquakes followed the January 1, 2025

storm in the next seven days in the South Sandwich Islands (M 6.1); Iquique, Chile (M 6.1)

Ethiopia (M 5.7); Guatemala M 6.2 and M 5.8 and Xizang M 7.1. A similar set

may occur following today's storm especially around April 20-24, 2025." (April 17, 2025)

 

The current storm has been long-lived perhaps delaying the onset of strong

global seismicity to this point, but ring currents in the ionosphere are

reforming and resulting telluric currents beneath these should begin to

trigger moderately large to large earthquakes in the next day or two. These

are most likely about 10 degrees from the geomagnetic equator but can occur

at high latitude as well." (April 20, 21, 2025)

 

The most likely areas to see enhanced seismicity following this flare

are located at local solar noon or local solar midnight and include areas

near 30 degrees East longitude and 150 degrees West longitude. The most

active seismic zones at these longitude are in Southern Alaska and

in Western Turkey and Greece.

 

A series of light earthquakes in Western Turkey near 28-29E longitude occurred after the flare

and may have been promoted by SFE from it. More such activity may

occur in the next day. The largest of today's events in western Turkey

occurred at 40N 28E near Istanbul with M 3.5. EMSC reported it was felt lightly in Turkey at Levent, Kayacik, Haci Yusuf. 600 Evler and Tatlisu.

This epicenter is at the sixth node (60 degrees) from the M 7.1 in Myanmar of March 28

and may have been promoted by energy from that source. The area near Istanbul

is considered a likely location for a strong, damaging earthquake in the

near future by many geophysicists, as noted in previous issues of this summary.

 

 

An unusually large M 4.5 also occurred at 150W longitude in the area of

Anchorage, Alaska. NEIC reported it was felt with intensity III in Alaska at Fort Richardson and Nikolai; III in Matanuska-Susitna Borough, Anchorage, Elmendorf AFB, Chugiak, Eagle River, Girdwood, Kenai, Nikolski, Palmer, Wasilla, Seward, Talkeetna, Willow and II in Manokotak, Soldotna and Sterling.

The last event with abouot 200 km of today's epicenter with M>=4.5 was an M 4.5 on October 11, 2024

but the last of significantly larger magnitude was 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 this summary

noted:

 

 

"Today's event was reported by NEIC to have been felt with maximum intensity V in the Matanuska-Sustina border of Alaska and II-III within about 200 km of the epicenter at Talkeetna, Willow, Wasilla, Chugiak, Elmendorf AFB, Anchorage.

This event of M 5.0 is the strongest within about 150 km of this epicenter in Central

Alaska since an M 5.0 on July 10, 2018 - the last of larger magntiude was an M 5.2 on January 31, 2017.

Today's event is about 150 km northwest of the M 7.1 quake that shook Alaska

on November 30, 2018 and may be a regional aftershock of that event." (October 4, 2019, December 1, 2023)

 

Today's event in Alaska was probably triggered by the solar flare

which occurred when this epicenter was within minutes of local solar midnight -

a time when SFE maximizes following solar flares.

 

 

O: 23APR2025 00:24:51 61.8N 150.1W ML=4.5  NEIC   Central Alaska         

P: 19APR2025 171555   60.2N 151.7W 3.2-5.0 BBAAA  Central Alaska     

 

An M 5.1 was widely felt in eastern Australia near Sydney today. NEIC reported maximum intensity V

in New South Wales at Singleton, IV in Armidale, Cessnock, Kurri Kurri, Wollongong, Camden, Forster-Tuncurry, Katoomba-Wentworth Falls, III in Lemon Tree Passage, Medowie, Nelson Bay, Raymond Terrace, Sydney, and as far as Tasmania.

TC Alfred passed north of this epicenter several months ago and did much

damage and may have helped promote today's event.  

 

O: 22APR2025 16:55:03 32.7S 150.8E ML=5.1  NEIC   New South Wales, Australia

 

The earthquake in New South Wales, Australia was one of three significant

earthquakes during the six minutes between 16:50 UT and 16:56 UT today.

The other events at this time were an M 5.7 in Vanuatu and an M 4.3 in Saudi Arabia.

The event in Jubail was reported felt with intensity II in Jubail, Saudi Arabia.

The trigger for these events is not currently obvious.

 

An earthquake of M 5.7 was also recorded in Papua New Guinea today. NEIC reported it

was felt with intensity III in New Guinea at Goroka, Kainantu and Madang with II in Wau, Morobe.

 

An earthquake of M 3.1 occurred in eastern Ohio today. NEIC reported it was felt with intensity IV in Ohio at Cumberland, Pleasant City and Sarahsville with III in Byesville, Caldwell, Senecaville, New Paris, Dayton and II in Newark, South Zanesville, Mason.

This is the strongest earthquake in Ohio within about 100 km of today's

epicenter since an M 3.4 on June 3, 2017. At the time this summary noted:

 

 

 

"An unusual earthquake of M 3.5 was widely felt in Ohio, U.S. today. NEIC reported

the event was felt with maximum intensity IV in Ohio at Lewisville, Quaker City, Byesville, and II-III in Senecaville, Salesville, Barnesville, Sarahsville, Caldwell, Cambridge, Cumberland, Norwich, Beverly, Lowell, Marietta, Little Hocking and Warren and in Evans City, Pennyslvania and Louisville, Kentucky and in general within about 50 km of the epicenter.

This is the second earthquake to be felt in Ohio in the past week, An M 3.4 occurred

about 150 km southwest of this on May 24. The last earthquake in Ohio within about

150 km of this epicenter occurred on November 20, 2013 with M 3.5. The only

such earthquake in Ohio in the past 25 years of larger magnitude was an M 3.6

on February 19, 1995 about 250 km southwest of today's epicenter." (June 3, 2017)

 

Forecast 171513 had expected this activity in Ohio in mid-April.

 

 

O: 22APR2025 08:12:50 39.9N  81.5W ML=3.1  NEIC   Ohio        

P: 17APR2025 171513   40.0N  84.0W 2.0-3.9 CABAA  Ohio/Lake Erie     

P: 14APR2025 171513   41.8N  81.4W 2.0-3.9 CBAAA  Ohio/Lake Erie     

 

NEIC reported an earthquake of M 2.6 in Southern Missouri was felt with  intensity up to II-III in the area(s) of Southern Missouri in Mansfield with intensity III and II in Saint Robert and Hartville and Jefferson City. Also reported felt lightly in Cordova, Tennessee.

 

NEIC reported an earthquake of M 3.9 in Gujarat, India was felt with  intensity up to II-III in the area(s) of Gujarat, India with IV at Anjar; III in Bhuj and II in Mundra.

EMSC reported it with M 4.3 was felt with moderate intensity in India at Anand Colong, Vijay Nagar, Bhuj, Gandhidham, Mundra.

 

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 in Calipatria with IV and in Palm Desert and San Diego with lesser shaking.

 

EMSC reported an earthquake of M 3.9 in Tunisia was felt with  intensity up to IV in the area(s) of Tunisia at Sidi Bouzid, Zarzouna.

 

TROPICAL CYCLONE 31P                 

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    31P      2025-04-22  00:00 UT  10.9S  135.4E  040 kts  South of New Guinea/ North of Australia

 

Tropical Cyclone 31P continued today in the area north of Australia with winds up to 40 kts.  It is expected to track to the south and east over the next several days. The antipode of this epicenter is at 11N 45W.  Energy from this storm could enhance seismicity in the region near the Mid-Atlantic ridge in the next several days.

 

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

7990       0054   0100      0107   C9.9      (April 22, 2025)   5.3E-03      

8050       1000*  1049      1134   M1.3      (April 22, 2025)   6.3E-02  

Talaud M 6.2-6.6 10:17 UT

South of Java M 5.7 10:14 UT

Seram M 4.9 10:15 UT

Honshu M 3.9 11:38 UT

 

8110       1851   1857      1900   C2.6      (April 22, 2025)   1.4E-03  

Banda Sea M 4.4 19:10 UT

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  minor storms April 23 active April 24-25.  Solar M-flare chance: 40% X-class: 1% proton storm: 1%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    13 14 13 08:00 4  142 163

 

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS) and

TC 31P (ADIS). Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04 23 09 06 2025 -21.9  -68.6 4.7 NNE OF CALAMA CHILE            M165 T95 R80 Z95 B131 A142

04 23 08 26 2025  37.5 -118.8 2.2 TOMS PLACE CA                  M112 T77 R59 Z107 B93 A111

04 23 08 23 2025  31.0 -103.7 2.0 NE OF BALMORHEA TEXAS          M124 T84 R55 Z112 B105 A124

04 23 04 45 2025  31.7 -104.3 2.4 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105 A123

04 23 04 31 2025  37.3  -92.5 2.6 E OF HARTVILLE MISSOURI        M120 T95 R44 Z123 B114 A131

04 23 04 27 2025   5.5   94.7 4.7 BANDA ACEH INDONESIA           M16 T93 R106 Z81 B58 A40

04 23 03 58 2025  65.7 -151.6 3.3 CENTRAL ALASKA                 M78 T87 R53 Z116 B82 A93

04 23 03 24 2025  -1.9  133.1 4.2 WNW OF BINTUNI INDONESIA       M43 T54 R127 Z53 B18 A8

04 23 03 21 2025  31.1 -103.2 2.2 SW OF COYANOSA TEXAS           M124 T84 R54 Z112 B105 A124

04 23 02 25 2025  36.6  142.4 4.4 ESE OF IWAKI JAPAN             M42 T70 R90 Z85 B43 A47

04 23 02 19 2025  36.6 -121.2 2.2 NW OF PINNACLES CA             M112 T75 R61 Z105 B91 A109

04 23 00 28 2025 -17.3 -175.0 4.6 NW OF NEIAFU TONGA             M95 T3 R134 Z33 B34 A51

04 23 00 24 2025  61.8 -150.1 4.5 CENTRAL ALASKA                 M81 T83 R55 Z113 B80 A93

04 23 00 09 2025  36.4  -83.8 2.3 N OF MAYNARDVILLE TENNESSEE    M121 T101 R39 Z128 B121 A138

04 23 00 09 2025  18.1  -68.4 3.8 DE YUMA DOMINICAN REPUBLIC     M137 T110 R44 Z127 B139 A158

04 22 22 55 2025  51.8 -171.6 3.5 ANDREANOF IS. ALASKA           M74 T71 R70 Z99 B65 A78

04 22 20 37 2025 -20.6 -173.5 5.1 SE OF PANGAI TONGA             M98 T0 R136 Z30 B36 A53

04 22 19 10 2025  -7.4  128.9 4.4 LOSPALOS TIMOR LESTE           M43 T56 R132 Z50 B22 A4

04 22 18 44 2025  18.8  -64.6 3.2 BAY U.S. VIRGIN ISLANDS        M135 T113 R42 Z130 B142 A161

04 22 18 13 2025  48.6 -121.3 2.1 ENE OF MARBLEMOUNT WASHINGTON  M102 T83 R53 Z113 B92 A108

04 22 17 56 2025  23.9   69.8 3.9 NNE OF BHUJ INDIA              M24 T121 R78 Z111 B85 A69

04 22 17 22 2025  35.0  -85.0 2.4 NW OF COHUTTA GEORGIA          M123 T100 R40 Z126 B120 A138

04 22 17 01 2025  44.7 -117.0 2.4 E OF RICHLAND OREGON           M107 T82 R53 Z113 B95 A111

04 22 16 55 2025 -32.7  150.9 5.1 SW OF SINGLETON AUSTRALIA      M75 T33 R159 Z18 B26 A28

04 22 16 55 2025 -13.1  167.1 5.7 NNW OF SOLA VANUATU            M78 T19 R137 Z33 B16 A34

04 22 16 50 2025  27.3   50.0 4.3 AL JUBAYL SAUDI ARABIA         M41 T139 R64 Z126 B103 A87

04 22 14 49 2025 -20.2 -173.2 4.9 ESE OF FANGALE’OUNGA TONGA   M98 T0 R135 Z31 B36 A53

04 22 14 49 2025  41.9 -112.6 2.4 ESE OF SNOWVILLE UTAH          M111 T83 R52 Z113 B98 A115

04 22 13 54 2025  33.2 -115.6 2.0 SW OF NILAND CA                M117 T76 R60 Z106 B95 A114

04 22 13 29 2025  -5.5  147.0 5.7 LAE PAPUA NEW GUINEA           M56 T40 R132 Z44 B4 A15

04 22 12 04 2025 -30.5  -72.2 4.4 W OF OVALLE CHILE              M166 T89 R89 Z86 B124 A133

04 22 12 02 2025  32.0 -103.3 2.0 JAL NEW MEXICO                 M123 T85 R54 Z112 B105 A124

04 22 10 17 2025   4.5  127.8 6.2 SE OF PONDAGUITAN PHILIPPINES  M35 T62 R120 Z61 B26 A14

04 22 10 15 2025  -3.5  131.0 4.9 WSW OF FAKFAK INDONESIA        M42 T56 R128 Z52 B20 A6

04 22 10 14 2025  -8.3  106.8 5.7 SSW OF BANJAR INDONESIA        M31 T77 R124 Z63 B44 A24

04 22 09 05 2025  33.2 -115.6 2.7 SW OF NILAND CA                M117 T76 R60 Z106 B95 A114

04 22 09 05 2025  33.2 -115.6 2.3 SW OF NILAND CA                M117 T76 R60 Z106 B95 A114

04 22 08 47 2025  35.8 -119.8 2.5 KETTLEMAN CITY CA              M113 T75 R61 Z105 B92 A110

04 22 08 12 2025  39.9  -81.5 3.1 PLEASANT CITY OHIO             M118 T104 R35 Z131 B121 A137

04 22 07 14 2025  -3.5  131.1 4.5 WSW OF FAKFAK INDONESIA        M42 T56 R129 Z52 B20 A6

04 22 06 53 2025  31.6 -104.5 2.2 WHITES CITY NEW MEXICO         M123 T84 R55 Z111 B104 A123

04 22 05 54 2025 -27.5  -69.3 4.5 E OF COPIAPó CHILE            M165 T92 R86 Z90 B128 A137

04 22 05 52 2025  18.8  -64.8 3.9 BAY U.S. VIRGIN ISLANDS        M135 T113 R42 Z130 B142 A161

04 22 05 04 2025  39.0   70.7 4.3 E OF RASHT TAJIKISTAN          M27 T121 R66 Z120 B86 A74

04 22 04 30 2025  39.4  144.7 4.4 E OF YAMADA JAPAN              M44 T70 R88 Z87 B45 A50

04 22 04 09 2025   4.3  124.8 4.2 SSW OF SARANGANI PHILIPPINES   M33 T64 R119 Z62 B28 A15

04 22 02 55 2025  40.3 -124.9 3.0 WNW OF PETROLIA CA             M107 T75 R60 Z106 B88 A106

04 22 02 00 2025  48.4  153.1 4.0 KURIL ISLANDS"                 M52 T74 R79 Z95 B54 A61

04 22 01 30 2025  45.5   82.4 4.2 N OF DRUZHBA KAZAKHSTAN        M25 T113 R67 Z117 B80 A70

 

 

April 22, 2025

 

It has now been five days since a major geomagnetic storm began. During this time

the global seismicity has been at quiet levels as expected at the time in

this summary:

 

 

"A severe geomagnetic storm began today about 16:00 UT (April 16). It reached

maximum Planetary Kp of 8 around 22:00-23:00 UT. The last geomagnetic storm

of greater disturbance occurred on January 1, 2025 with A-index (planetary)

of 86. Today's AP index reached 77. A major earthquake of M 7.1 followed the January 1, 2025 storm

on January 7, 2025 in the area of Xizang, China. Severe storms of this

type can trigger enhanced seismicity at the time of commencement (see previous

issue of this summary) or after ring currents re-develop up to a week after

the initiation of the storm.  Strong earthquakes followed the January 1, 2025

storm in the next seven days in the South Sandwich Islands (M 6.1); Iquique, Chile (M 6.1)

Ethiopia (M 5.7); Guatemala M 6.2 and M 5.8 and Xizang M 7.1. A similar set

may occur following today's storm especially around April 20-24, 2025." (April 17, 2025)

 

The current storm has been long-lived perhaps delaying the onset of strong

global seismicity to this point, but ring currents in the ionosphere are

reforming and resulting telluric currents beneath these should begin to

trigger moderately large to large earthquakes in the next day or two. These

are most likely about 10 degrees from the geomagnetic equator but can occur

at high latitude as well.

 

While this newly enhanced seismicity is awaited global seismicity remained

at low to quiet levels with no significant earthquakes recorded.

 

The strongest solar flare of the day was an M1.9 class event (SWPC # 7950).

An earthquake in Hokkaido, Japan of M 4.1 occurred at the start of this

strong flare and may have been promoted by SFE associated with it.

Data on this flare from SWPC follow:

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

7950       1824   1837      1841   M1.9      (April 21, 2025)   8.5E-03  

Hokkaido, Japan M 4.1 18:24 UT

 

NEIC reported an earthquake of M 3.0 off the coast of northern California  was felt with  intensity up to II-III in the area(s) of northern California at Eureka.

 

NEIC reported an earthquake of M 4.5 in Luzon, Philippines was felt with  intensity up to II-III in the area(s) of Luzon, Philippines with IV in Davila, Ilocos.

 

NEIC reported an earthquake of M 3.4 in the Alaska Peninsula was felt with  intensity up to II-III in the area(s) of the Alaska Peninsula at King Cove.

 

NEIC reported an earthquake of M 4.5 in Honshu, Japan was felt with  intensity up to II-III in the area(s) of Honshu, Japan with III in Chiba and Tokyo and II in Kanagawa Prefectures.

EMSC reported weak shaking in Chiba Prefecture.

 

EMSC reported an earthquake of M 4.0 in Mindanao, Philippines was felt with  intensity up to IV in the area(s) of Mindanao, Philippines at Cebu City with a sudden jolt.

 

EMSC reported an earthquake of M 4.3 in Western Turkey was felt with  intensity up to IV in the area(s) of Western Turkey at Cumhuriyet,Abaci, Bahcelievler, Gundogan, Yunus Emre, Akincilar, Derecik, Sakarya, Esnevler, Evka.

 

CSN reported the following parameters for an M 4.6 in Atacama today:

 

22-04-2025  05:54  27.55  69.44  114  4.6   III   Atacama at Copiapo and Tierra Amarilla, Chile.

 

 

TROPICAL CYCLONE 31P                 

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    31P      2025-04-22  00:00 UT  10.3S  134.0E  045 kts  South of New Guinea/ North of Australia

 

Tropical Cyclone 31P continued today in the area north of Australia with winds up to 45 kts.  It is expected to track to the south and east over the next several days. The antipode of this epicenter is at 11N 45W.  Energy from this storm could enhance seismicity in the region near the Mid-Atlantic ridge in the next several days.

 

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

7810       0010   0031      0054   C3.9      (April 21, 2025)   8.3E-03  

Chiapas M 4.2 00:20 UT

 

7870       0631   0642      0651   C2.1      (April 21, 2025)   2.5E-03  

Halmahera M 4.4 07:17 UT

Argentina M 4.0 06:57 UT

 

7950       1824   1837      1841   M1.9      (April 21, 2025)   8.5E-03  

Hokkaido, Japan M 4.1 18:24 UT

 

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  major storms April 22 minor storms April 23 active April 24.  Solar M-flare chance: 40% X-class: 1% proton storm: 1%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    35 37 24 13:00 5  137 163

 

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS) and

TC 31P (ADIS). Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04 22 09 05 2025  33.2 -115.6 2.7 SW OF NILAND CA                M117 T76 R60 Z106 B95 A112

04 22 08 47 2025  35.8 -119.8 2.5 KETTLEMAN CITY CA              M113 T75 R61 Z105 B92 A108

04 22 08 12 2025  39.9  -81.5 3.1 PLEASANT CITY OHIO             M118 T104 R35 Z131 B121 A136

04 22 06 53 2025  31.6 -104.5 2.4 VAN HORN TEXAS                 M123 T84 R55 Z111 B104 A121

04 22 05 54 2025 -27.5  -69.3 4.5 E OF COPIAPó CHILE            M165 T92 R86 Z90 B128 A136

04 22 05 52 2025  18.8  -64.8 3.9 BAY U.S. VIRGIN ISLANDS        M135 T113 R42 Z130 B142 A159

04 22 05 04 2025  39.0   70.7 4.3 E OF RASHT TAJIKISTAN          M27 T121 R66 Z120 B86 A76

04 22 02 55 2025  40.3 -124.9 3.0 WNW OF PETROLIA CA             M107 T75 R60 Z106 B88 A104

04 21 22 52 2025  46.2  149.6 4.3 NE OF KURIL’SK RUSSIA        M49 T73 R81 Z93 B51 A57

04 21 22 23 2025  -5.4  -76.2 4.8 NNW OF YURIMAGUAS PERU         M161 T95 R68 Z104 B130 A146

04 21 22 07 2025  38.3  -96.9 2.6 ESE OF MARION KANSAS           M118 T92 R46 Z120 B110 A126

04 21 21 28 2025   0.4  125.0 4.7 E OF MODISI INDONESIA          M35 T63 R123 Z59 B27 A13

04 21 21 19 2025  32.1 -102.2 2.5 NW OF MIDLAND TEXAS            M123 T86 R53 Z113 B106 A123

04 21 21 13 2025  49.3 -120.5 2.1 S OF PRINCETON CANADA          M101 T83 R52 Z114 B93 A107

04 21 18 23 2025  41.8  143.4 4.1 SSE OF HIROO JAPAN             M44 T73 R85 Z90 B48 A52

04 21 17 46 2025  18.4  120.8 4.5 SSE OF BANGUI PHILIPPINES      M23 T74 R105 Z76 B38 A31

04 21 17 24 2025  39.3   29.0 4.0 N OF SIMAV TURKEY              M58 T152 R43 Z148 B118 A107

04 21 16 48 2025  37.4  141.6 4.5 ENE OF TOMIOKA JAPAN           M42 T71 R90 Z86 B44 A47

04 21 16 14 2025  26.5  140.5 4.0 BONIN ISLANDS JAPAN REGION"    M40 T64 R100 Z76 B34 A36

04 21 15 46 2025 -56.1  -28.0 5.1 SOUTH SANDWICH ISLANDS REGION" M126 T98 R108 Z76 B118 A112

04 21 15 31 2025  55.1 -162.1 3.4 KING COVE ALASKA               M78 T75 R64 Z104 B71 A83

04 21 13 11 2025  36.0  139.8 4.5 N OF KASUKABE JAPAN            M40 T71 R91 Z85 B43 A46

04 21 10 42 2025  30.2   52.0 4.4 E OF NÅ«RāBāD IRAN           M40 T137 R63 Z127 B101 A88

04 21 09 28 2025 -18.2 -178.1 4.4 E OF LEVUKA FIJI               M93 T4 R136 Z31 B31 A47

04 21 08 26 2025   8.9  126.6 4.4 E OF ARAS-ASAN PHILIPPINES     M32 T65 R115 Z65 B29 A20

04 21 08 22 2025 -31.9  -68.3 4.3 NUEVE DE JULIO ARGENTINA       M162 T91 R89 Z87 B126 A133

04 21 07 53 2025  -1.2  -15.9 5.2 NORTH OF ASCENSION ISLAND"     M110 T149 R55 Z132 B165 A148

04 21 07 32 2025  39.1 -119.0 2.9 KM ENE OF YERINGTON            M111 T78 R58 Z108 B93 A109

04 21 07 20 2025  37.4 -117.2 2.3 KM S OF GOLDFIELD              M113 T78 R58 Z108 B94 A110

04 21 07 17 2025   0.4  127.1 4.4 SW OF TERNATE INDONESIA        M37 T61 R124 Z57 B25 A12

04 21 06 17 2025  38.2   69.1 4.3 SSE OF YOVON TAJIKISTAN        M28 T123 R66 Z120 B87 A77

04 21 05 56 2025   6.8  126.6 4.5 SE OF LUKATAN PHILIPPINES      M33 T64 R117 Z63 B28 A18

04 21 02 03 2025  18.7  -67.1 3.1 SAN ANTONIO PUERTO RICO        M136 T111 R43 Z128 B140 A157

04 21 01 59 2025  33.2 -115.6 2.2 NW OF CALIPATRIA CA            M117 T76 R60 Z106 B95 A112

04 21 01 07 2025  32.6   93.4 4.7 NE OF NAGQU CHINA              M10 T102 R82 Z102 B67 A57

04 21 00 03 2025  29.2   87.0 4.2 N OF LOBUCHE NEPAL             M10 T107 R82 Z103 B71 A59

 

April 21, 2025

 

It has now been four days since a major geomagnetic storm began. During this time

the global seismicity has been at quiet levels as expected at the time in

this summary:

 

 

"A severe geomagnetic storm began today about 16:00 UT (April 16). It reached

maximum Planetary Kp of 8 around 22:00-23:00 UT. The last geomagnetic storm

of greater disturbance occurred on January 1, 2025 with A-index (planetary)

of 86. Today's AP index reached 77. A major earthquake of M 7.1 followed the January 1, 2025 storm

on January 7, 2025 in the area of Xizang, China. Severe storms of this

type can trigger enhanced seismicity at the time of commencement (see previous

issue of this summary) or after ring currents re-develop up to a week after

the initiation of the storm.  Strong earthquakes followed the January 1, 2025

storm in the next seven days in the South Sandwich Islands (M 6.1); Iquique, Chile (M 6.1)

Ethiopia (M 5.7); Guatemala M 6.2 and M 5.8 and Xizang M 7.1. A similar set

may occur following today's storm especially around April 20-24, 2025." (April 17, 2025)

 

The current storm has been long-lived perhaps delaying the onset of strong

global seismicity to this point, but ring currents in the ionosphere are

reforming and resulting telluric currents beneath these should begin to

trigger moderately large to large earthquakes in the next day or two. These

are most likely about 10 degrees from the geomagnetic equator but can occur

at high latitude as well.

 

While this newly enhanced seismicity is awaited global seismicity remained

at low to quiet levels with no significant earthquakes recorded.

 

The largest earthquake reported in the world today was an M 5.4 in the Ceram Sea area of Indonesia. NEIC reported it may have been felt with intensity up to V in the epicentral area.

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in the Near Islands, Aleutians, Alaska. It was not reported felt in this remote area.

An M 4.1 also occurred in the Fox Islands, Alaska but was not reported felt.

 

 

NEIC reported an earthquake of M 2.9 in Wyoming was felt with  intensity up to II-III in the area(s) of Wyoming at Jackson.

 

NEIC reported an earthquake of M 4.9 in Vanuatu was felt with  intensity up to II-III in the area(s) of Vanuatu with IV in Vila Shefa.

 

NEIC reported an earthquake of M 4.6 in northern Vanuatu was felt with  intensity up to II-III in the area(s) of northern Vanuatu with III in Vila Shefa.

 

NEIC reported an earthquake of M 4.4 in the Dodecanese Islands, Greece was felt with  intensity up to II-III in the area(s) of the Dodecanese Islands in Kiklades at Kamarion, Mesaria, Naousa, Greece.

 

NEIC reported an earthquake of M 3.2 in northeastern Washington State was felt with  intensity up to II-III in the area(s) of northeastern Washington State with IV in Tonasket; III in Loomis, Oroville and Seattle and in Walnut Grove, British Columbia, Canada.

 

 

 

TROPICAL CYCLONE 31P                 

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    31P      2025-04-21  00:00 UT  10.9S  135.4E  040 kts  South of New Guinea/ North of Australia

 

Tropical Cyclone 31P continued today in the area north of Australia with winds up to 40 kts.  It is expected to track to the south and east over the next several days. The antipode of this epicenter is at 11N 45W.  Energy from this storm could enhance seismicity in the region near the Mid-Atlantic ridge in the next several days.

 

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

7720       0620   0623      0626   C2.0      (April 20, 2025)   6.8E-04  

Crete M 3.8 06:22 UT

Tarapaca  M 4.2 06:35 UT

 

7730       0750   0757      0806   C2.2      (April 20, 2025)   2.0E-03  

7740       1137   1211      1259   M1.0      (April 20, 2025)   6.1E-04  

7790       1623   1628      1633   C1.7      (April 20, 2025)   8.3E-04  

7800       1702   1718      1734   C4.3      (April 20, 2025)   6.4E-03  

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  disturbed April 21 major storms April 22 minor storms April 23.  Solar M-flare chance: 40% X-class: 1% proton storm: 1%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    14 13 11 11:00 4  108 156

 

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS) and

TC 31P (ADIS). Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04 21 07 53 2025  -1.2  -15.9 5.2 NORTH OF ASCENSION ISLAND"     M110 T149 R55 Z132 B165 A148

04 21 07 32 2025  39.1 -119.0 2.9 KM ENE OF YERINGTON            M111 T78 R58 Z108 B93 A109

04 21 07 20 2025  37.4 -117.2 2.3 KM S OF GOLDFIELD              M113 T78 R58 Z108 B94 A110

04 21 05 56 2025   6.8  126.6 4.5 SE OF LUKATAN PHILIPPINES      M33 T64 R117 Z63 B28 A18

04 21 02 03 2025  18.7  -67.1 3.1 SAN ANTONIO PUERTO RICO        M136 T111 R43 Z128 B140 A157

04 21 01 59 2025  33.2 -115.6 2.2 NW OF CALIPATRIA CA            M117 T76 R60 Z106 B95 A112

04 21 01 07 2025  32.6   93.4 4.7 NE OF NAGQU CHINA              M10 T102 R82 Z102 B67 A57

04 21 00 03 2025  29.2   87.0 4.2 N OF LOBUCHE NEPAL             M10 T107 R82 Z103 B71 A59

04 20 23 28 2025  51.2 -178.6 3.9 WSW OF ADAK ALASKA             M70 T71 R72 Z98 B62 A73

04 20 23 09 2025  31.7 -104.3 2.2 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105 A122

04 20 22 40 2025  43.5 -110.5 2.2 SSE OF KELLY WYOMING           M110 T86 R50 Z116 B99 A115

04 20 22 39 2025  18.9  -66.9 3.0 ISABELA PUERTO RICO            M136 T111 R43 Z128 B140 A157

04 20 22 22 2025  34.0 -118.8 2.1 SE OF MALIBU CA                M115 T75 R61 Z104 B92 A109

04 20 21 55 2025  40.3 -124.7 3.0 WNW OF PETROLIA CA             M107 T75 R60 Z106 B88 A104

04 20 21 51 2025   1.3  126.5 4.3 WNW OF TERNATE INDONESIA       M36 T62 R123 Z59 B26 A13

04 20 21 25 2025  18.9  -64.2 3.4 BAY U.S. VIRGIN ISLANDS        M134 T114 R41 Z130 B142 A160

04 20 21 14 2025  43.5 -110.6 2.9 E OF JACKSON WYOMING           M110 T85 R50 Z116 B99 A115

04 20 21 06 2025  34.0 -117.1 2.0 S OF MENTONE CA                M116 T76 R60 Z105 B94 A111

04 20 20 59 2025 -25.3   55.8 4.8 SOUTH INDIAN OCEAN"            M61 T113 R108 Z84 B92 A75

04 20 20 34 2025  38.9   70.8 4.1 ESE OF RASHT TAJIKISTAN        M27 T121 R67 Z120 B86 A76

04 20 20 33 2025  12.9  143.3 4.8 MERIZO VILLAGE GUAM            M45 T53 R114 Z62 B20 A24

04 20 20 20 2025  39.0   70.7 4.3 E OF RASHT TAJIKISTAN          M27 T121 R66 Z120 B86 A76

04 20 20 16 2025  32.1 -101.7 2.2 ESE OF STANTON TEXAS           M123 T86 R53 Z114 B107 A124

04 20 18 19 2025  -3.4  131.0 5.4 WSW OF FAKFAK INDONESIA        M42 T56 R128 Z52 B20 A7

04 20 17 45 2025 -17.6  168.0 4.9 WNW OF PORT-VILA VANUATU       M80 T17 R141 Z29 B19 A33

04 20 17 42 2025  37.4 -117.2 2.0 KM S OF GOLDFIELD              M113 T78 R58 Z108 B94 A110

04 20 16 29 2025  31.7 -104.3 2.2 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105 A122

04 20 16 18 2025  31.7 -104.3 3.1 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105 A122

04 20 15 15 2025 -13.7  166.9 4.6 WNW OF SOLA VANUATU            M78 T19 R138 Z32 B16 A32

04 20 13 03 2025 -19.3 -177.0 4.4 NW OF HOUMA TONGA              M94 T3 R136 Z30 B33 A48

04 20 11 49 2025  54.3 -158.8 3.1 155 KM SE OF                   M80 T75 R64 Z104 B72 A85

04 20 11 22 2025  71.1 -136.9 3.1 NORTHERN ALASKA                M80 T94 R45 Z124 B89 A99

04 20 11 21 2025  -8.0  116.9 4.2 LABUAN LOMBOK INDONESIA        M36 T67 R128 Z56 B34 A17

04 20 10 26 2025  50.9  175.1 3.8 NEAR ISLAND ALASKA             M66 T71 R74 Z97 B60 A70

04 20 08 59 2025  53.0 -170.5 4.1 W OF NIKOLSKI ALASKA           M74 T73 R69 Z101 B66 A78

04 20 08 59 2025  44.6 -112.5 2.6 SE OF LIMA MONTANA             M108 T85 R51 Z115 B98 A113

04 20 08 32 2025  36.6   25.7 4.4 SW OF AMORGóS GREECE          M61 T156 R42 Z148 B122 A110

04 20 08 10 2025  48.8 -119.5 3.2 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93 A108

04 20 06 35 2025 -19.1  -70.5 4.2 W OF CUYA CHILE                M166 T95 R78 Z97 B131 A142

04 20 06 11 2025  35.4  140.0 4.5 NE OF KISARAZU JAPAN           M40 T70 R91 Z84 B42 A45

04 20 05 50 2025  34.5 -117.3 2.7 MOUNTAIN VIEW ACRES CA         M115 T76 R60 Z106 B94 A110

04 20 05 47 2025  -6.6  148.7 4.3 FINSCHHAFEN PAPUA NEW GUINEA   M59 T38 R134 Z42 B3 A14

04 20 05 22 2025 -14.5   77.4 4.9 SOUTH INDIAN OCEAN"            M40 T101 R113 Z78 B73 A55

04 20 04 46 2025  39.7 -123.5 2.1 KM OF LAYTONVILLE CA           M108 T75 R60 Z106 B89 A105

04 20 04 40 2025  36.8 -121.6 2.8 SAN JUAN BAUTISTA CA           M111 T75 R61 Z105 B90 A107

04 20 04 29 2025  35.7  -90.3 2.1 SW OF ETOWAH ARKANSAS          M122 T96 R43 Z123 B116 A132

04 20 04 25 2025  36.8 -121.6 3.0 SAN JUAN BAUTISTA CA           M111 T75 R61 Z105 B90 A107

04 20 04 07 2025  40.3 -124.5 2.4 W OF PETROLIA CA               M107 T75 R60 Z106 B89 A105

04 20 02 21 2025  36.8 -121.6 2.7 SAN JUAN BAUTISTA CA           M111 T75 R61 Z105 B90 A107

04 20 02 19 2025  -5.9  145.9 4.3 KAINANTU PAPUA NEW GUINEA      M56 T41 R133 Z44 B5 A12

04 20 01 33 2025  32.1 -101.9 2.4 W OF STANTON TEXAS             M123 T86 R53 Z113 B107 A124

04 20 01 17 2025  31.7 -104.3 2.0 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105 A122

04 20 01 14 2025  28.9  -99.0 2.2 E OF PEARSALL TEXAS            M127 T87 R53 Z113 B109 A127

04 20 00 35 2025  -2.8  122.3 4.3 NNW OF KENDARI INDONESIA       M35 T64 R125 Z57 B29 A13

04 20 00 28 2025  44.8   79.7 4.3 NNW OF ZHARKENT KAZAKHSTAN     M26 T115 R66 Z118 B81 A73

04 20 00 10 2025  40.6 -125.1 2.6 WNW OF FERNDALE CA             M106 T75 R60 Z106 B88 A104

 

 

April 20, 2025

 

The strongest earthquake in the world today was an M 5.9 south of Mindanao, Philippines. NEIC reported the mainshock was felt with intensity VII in Mindanao at Kalamansig (Slight damage); V in Banga, Buayan, Kiamba, IV in Kalawag, Surallah, III in Alabel, Davao, Katangawan, Maitum San Jose, Zamboanga and II in Koronadal, Polonuling, Silway.

Aftershocks of M 5.2 and M 5.2 were felt with intensity II-III in the same area.

PHIVOLCS reported intensity V in Kiamba, Sarangani; Lebak and Palimband, Sultan Kudarat and IV in Alabel, Glan, and Maitum, Sarangani; T'Boli and Tupi, South Cotabto, Kalamansig, Sultan Kudarat with II in City of General Santos; II in Davao Occidental; City of Davao and lesser intensity in Zamboanga, Davao del Sur.

This earthquake of M 5.9 was probably triggered by an M-class solar flare as

it occurred within a couple of minutes of the beginning of that flare, the

strongest in the past two days. It also occurred within minutes of local

solar midnight - a prime time for tidal and geomagnetic earthquake triggering.

Data from SWPC for this flare follow:

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

 

7690       1610   1628      1632   C4.3      (April 19, 2025)   1.8E-03* 

Mindanao M 5.9 16:11 UT

 

Forecast 171344 had expected this earthquake within about 15 km was likely

around April 18.

 

 

O: 19APR2025 16:11:15  5.9N 124.1E ML=5.9  EMSC   Mindanao, Philippines 

P: 18APR2025 171344    6.0N 124.0E 4.0-5.4 CAAAA  Mindanao, Philippines         

 

A moderately large earthquake of M 5.7 also occurred in Hindu Kush, Afghanistan today. NEIC reported it was felt with maximum intensity V in Peshawar, Northwest Frontier, Pakistan; IV in Lahore, and Sangala Hill, Punjab; III in Pakiestan at Abottabad, Tawalpindi and II in Islamabad, Kasur, and Wah. It was also felt with intensity II-III in Kabul, Afghanistan and India.

This event occurred within minutes of local solar noon and was probably

promoted by solar/geomagnetic or tidal effects which maximize near this hour.

 

Forecast 171437 had expected this event within about 100 km was likely

to occur around April 19, 2025.

 

O: 19APR2025 06:47:55 36.2N  71.2E ML=5.7  EMSC   Hindu Kush, Afghanistan

P: 19APR2025 171437   37.0N  70.0E 3.8-5.4 CAAAA  Hindu Kush/Pakistan          

 

 

An earthquake of M 5.1 occurred today in the Central Mid-Atlantic Ridge. It was

not reported felt in this remote area. This epicenter is nearly antipodal to

TC 31P off northern Australia and may have been promoted by energy from

that source. In the previous issue of this summary this possibility had

been noted as:

 

"Tropical Cyclone 31P continued today in the area north of Australia with winds up to 45 kts.  It is expected to track to the south and east over the next several days. The antipode of this epicenter is at 11N 41W.  Energy from this storm could enhance seismicity in the region near the Mid-Atlantic ridge in the next several days." (April 18, 2025)

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in southern Alaska. NEIC reported it was felt with intensity III in Anchorage, Elmendorf, Chugiak, Cooper Landing, Eagle River, Girdwood, Homer, Kenai, Wasilla, Sterling, Talkeetna and Willow with II inMatanuska- Susitna Borough, Fort Richardson, Palmer, Seward, Skwentna, Soldotna, Tyonek and Valdez.

 

An M 3.9 occurred today in the area of southern Alaska. NEIC reported it was felt with intensity III in Anchorage, Anchor Point, Cooper Landing and II in Clam Gulch, Eagle River and Girdwood.

 

NEIC reported an earthquake of M 4.5 in Southeastern Honshu, Japan was felt with  intensity up to II-III in the area(s) of Southeastern Honshu, Japan was felt with intensity II in Tokyo at Tokyo and Ome and in Kawasaki, Kanagawa and Narita, Chiba, Japan.

 

NEIC reported an earthquake of M 4.4 in Dodecanese Islands, Greece was felt with  intensity up to II-III in the area(s) of Dodecanese Islands, Greece in Kiklades at Mesaria and Naousa.

 

NEIC reported an earthquake of M 3.2 in northeastern Washington State was felt with  intensity up to II-III in the area(s) of northeastern Washington State with IV in Tonasket; III in Loomis, Oroville and Seattle and in Walnut Grove, British Columbia, Canada.

 

NEIC reported an earthquake of M 2.6 in Eastern Los Angeles, California was felt with  intensity up to II-III in the area(s) of Eastern Los Angeles, California with III in Adelanto, Apple Valley, Hesperia, Victorville, Wrightwood and II in Phelan.

 

NEIC reported earthquakes of M M 3.0, 2.8 and 2.7 in Central California were felt with  intensity up to II-III in the area(s) of Salinas, Carmel and II in Marina, Seaside, Aromas and Gilroy.

 

NEIC reported an earthquake of M 2.6 off the coast of Northern California   was felt with  intensity up to II-III in the area(s) of  Northern California at Trinidad.

 

 

NEIC reported an earthquake of M 5.3 in Samoa was felt with  intensity up to II-III in the area(s) of Samoa with IV at American Samoa, III in Upolu, Samoa at Tulaele and II in Samea.

 

NEIC reported an earthquake of M 2.6 in Nevada was felt with  intensity up to II-III in the area(s) of Nevada at Carson City.

 

NEIC reported an earthquake of M 3.1 off the coast of Oregon  was felt with  intensity up to II-III in the area(s) of Oregon, Washington and northern California.

 

NEIC reported an earthquake of M 5.2 in Central Peru was felt with  intensity up to II-III in the area(s) of Central Peru with IV at Huanuco and III in Tingo Maria.

 

 

NEIC reported an earthquake of M 3.2 in Central Alaska was felt with  intensity up to II-III in the area(s) of Central Alaska with IV in Chugiak; III in Anchorage, Eagle River and Palmer and II in Girdwood, and Wasilla.

 

NEIC reported an earthquake of M 3.1 in Southern California was felt with  intensity up to II-III in the area(s) of Southern California with II n Los Angeles, Azusa, Camarillo and Ridgecrest.

 

 

 

TROPICAL CYCLONE 31P                 

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    31P      2025-04-20  00:00 UT  12.6S  140.2E  040 kts  South of New Guinea/ North of Australia

 

Tropical Cyclone 31P continued today in the area north of Australia with winds up to 40 kts.  It is expected to track to the south and east over the next several days. The antipode of this epicenter is at 12N 40W.  Energy from this storm could enhance seismicity in the region near the Mid-Atlantic ridge in the next several days.

 

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

7660       1106   1114      1120   C1.5      (April 19, 2025)   1.2E-03  

 

7690       1610   1628      1632   C4.3      (April 19, 2025)   1.8E-03 *  

Mindanao M 5.9 16:11 UT

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  disturbed April 20-21 major storms April 22.  Solar M-flare chance: 40% X-class: 5% proton storm: 1%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    20 49 18 12:00 6  114 157

 

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS) and

TC 31P (ADIS). Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04 20 08 59 2025  53.0 -170.5 4.1 W OF NIKOLSKI ALASKA           M74 T73 R69 Z101 B66 E76

04 20 08 59 2025  44.6 -112.5 2.6 SE OF LIMA MONTANA             M108 T85 R51 Z115 B98 E110

04 20 08 32 2025  36.6   25.7 4.4 SW OF AMORGóS GREECE          M61 T156 R42 Z148 B122 E115

04 20 08 10 2025  48.8 -119.5 3.2 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93 E105

04 20 06 35 2025 -19.1  -70.5 4.2 W OF CUYA CHILE                M166 T95 R78 Z97 B131 E137

04 20 06 11 2025  35.4  140.0 4.5 NE OF KISARAZU JAPAN           M40 T70 R91 Z84 B42 E46

04 20 05 50 2025  34.5 -117.3 2.6 MOUNTAIN VIEW ACRES CA         M115 T76 R60 Z106 B94 E106

04 20 05 47 2025  -6.6  148.7 4.3 FINSCHHAFEN PAPUA NEW GUINEA   M59 T38 R134 Z42 B3 E9

04 20 05 22 2025 -14.5   77.4 4.9 SOUTH INDIAN OCEAN"            M40 T101 R113 Z78 B73 E61

04 20 04 46 2025  39.7 -123.5 2.1 KM OF LAYTONVILLE CA           M108 T75 R60 Z106 B89 E101

04 20 04 40 2025  36.8 -121.6 2.8 SAN JUAN BAUTISTA CA           M111 T75 R61 Z105 B90 E103

04 20 04 25 2025  36.8 -121.6 3.0 SAN JUAN BAUTISTA CA           M111 T75 R61 Z105 B90 E103

04 20 04 07 2025  40.3 -124.5 2.4 W OF PETROLIA CA               M107 T75 R60 Z106 B89 E101

04 20 02 21 2025  36.8 -121.6 2.7 SAN JUAN BAUTISTA CA           M111 T75 R61 Z105 B90 E103

04 20 02 19 2025  -5.9  145.9 4.3 KAINANTU PAPUA NEW GUINEA      M56 T41 R133 Z44 B5 E7

04 20 00 35 2025  -2.8  122.3 4.3 NNW OF KENDARI INDONESIA       M35 T64 R125 Z57 B29 E19

04 20 00 28 2025  44.8   79.7 4.3 NNW OF ZHARKENT KAZAKHSTAN     M26 T115 R66 Z118 B81 E77

04 20 00 10 2025  40.6 -125.1 2.6 WNW OF FERNDALE CA             M106 T75 R60 Z106 B88 E100

04 19 23 30 2025 -15.6  -74.0 4.2 NNE OF TOCOTA PERU             M168 T93 R77 Z97 B129 E137

04 19 23 06 2025   1.7  128.7 4.8 E OF TOBELO INDONESIA          M37 T60 R123 Z58 B24 E16

04 19 23 04 2025  10.7  -85.9 4.4 SARDINAL COSTA RICA            M147 T91 R60 Z110 B122 E134

04 19 20 49 2025  33.1 -116.6 2.1 SSW OF JULIAN CA               M117 T76 R61 Z105 B94 E107

04 19 19 45 2025  38.8 -122.8 2.4 THE GEYSERS CA                 M109 T75 R60 Z106 B90 E102

04 19 18 41 2025  45.1  -75.5 2.1 W OF WINCHESTER CANADA         M112 T109 R29 Z138 B123 E134

04 19 18 37 2025  54.4 -158.8 3.5 SAND POINT ALASKA              M80 T75 R64 Z105 B72 E82

04 19 18 26 2025  31.5 -104.0 2.0 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105 E117

04 19 18 24 2025  86.3   35.1 4.2 FRANZ JOSEF LAND               M66 T113 R36 Z138 B97 E101

04 19 18 00 2025   2.7  128.4 4.2 NNE OF TOBELO INDONESIA        M36 T60 R122 Z59 B24 E17

04 19 17 37 2025   5.9  124.1 5.2 SW OF MALISBENG PHILIPPINES    M31 T66 R118 Z64 B29 E23

04 19 16 55 2025 -15.1 -173.6 5.3 NNE OF HIHIFO TONGA            M95 T5 R131 Z35 B35 E45

04 19 16 50 2025   5.8  124.2 5.2 SSW OF MALISBENG PHILIPPINES   M31 T66 R118 Z64 B29 E22

04 19 16 11 2025   5.8  124.1 5.9 SW OF MALISBENG PHILIPPINES    M31 T66 R118 Z64 B29 E22

04 19 14 53 2025  39.4 -123.3 2.2 ESE OF WILLITS CA              M108 T75 R60 Z106 B89 E102

04 19 14 49 2025  39.1 -119.0 2.6 KM NE OF YERINGTON             M111 T78 R58 Z108 B93 E105

04 19 13 50 2025   7.1  -34.3 5.1 CENTRAL MID-ATLANTIC RIDGE"    M123 T138 R45 Z136 B173 E173

04 19 13 24 2025  31.7 -104.4 2.2 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104 E117

04 19 13 12 2025  43.4 -127.1 3.1 W OF BANDON OREGON             M103 T76 R59 Z107 B87 E99

04 19 13 01 2025  60.2 -151.9 3.9 SOUTHERN ALASKA                M81 T82 R57 Z111 B79 E88

04 19 12 43 2025 -23.9  -13.6 4.9 SOUTHERN MID-ATLANTIC RIDGE"   M115 T132 R78 Z109 B147 E136

04 19 12 42 2025   1.9  -96.6 4.8 THE GALAPAGOS ISLANDS          M153 T78 R73 Z96 B111 E123

04 19 12 38 2025 -18.6 -175.5 4.5 W OF NEIAFU TONGA              M95 T2 R135 Z31 B34 E43

04 19 11 56 2025  -9.4  -76.1 5.2 TINGO MARíA PERU              M165 T94 R72 Z101 B129 E138

04 19 11 42 2025 -18.7 -177.6 4.3 FIJI REGION"                   M93 T3 R136 Z31 B32 E41

04 19 09 40 2025  19.1  -66.1 3.3 SAN JUAN PUERTO RICO           M135 T112 R42 Z129 B140 E153

04 19 08 43 2025  13.6  -91.9 4.3 S OF CHAMPERICO GUATEMALA      M143 T87 R61 Z108 B117 E129

04 19 08 40 2025  62.6 -152.2 3.2 CENTRAL ALASKA                 M80 T84 R55 Z113 B80 E89

04 19 08 35 2025  40.6   83.9 4.3 SSE OF KUQA CHINA              M21 T111 R71 Z113 B77 E72

04 19 08 24 2025  35.3 -117.8 2.4 WSW OF JOHANNESBURG CA         M114 T76 R60 Z106 B93 E106

04 19 08 02 2025  42.1 -120.2 2.1 NEW PINE CREEK OREGON          M108 T79 R56 Z109 B92 E104

04 19 07 45 2025  38.8 -122.8 2.1 THE GEYSERS CA                 M109 T75 R60 Z106 B90 E102

04 19 07 44 2025  35.3 -117.8 3.1 WSW OF JOHANNESBURG CA         M114 T76 R60 Z106 B93 E106

04 19 07 44 2025   5.6  126.5 4.4 SSE OF PONDAGUITAN PHILIPPINES M33 T63 R119 Z62 B27 E21

04 19 07 18 2025  61.2 -151.5 4.3 SOUTHERN ALASKA                M81 T83 R56 Z112 B80 E89

04 19 06 47 2025  36.2   71.2 5.7 SSW OF ASHKāSHAM AFGHANISTAN  M25 T121 R69 Z118 B85 E79

04 19 06 14 2025  31.7 -104.3 2.0 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105 E117

04 19 04 51 2025 -21.5  -66.9 4.6 SW OF ATOCHA BOLIVIA           M164 T97 R79 Z97 B133 E138

04 19 03 14 2025   2.5  -31.0 4.8 CENTRAL MID-ATLANTIC RIDGE"    M122 T139 R50 Z133 B175 E167

04 19 02 45 2025  39.1 -119.0 2.4 KM ENE OF YERINGTON            M111 T78 R58 Z108 B93 E105

04 19 02 20 2025  -3.5  -77.7 4.6 E OF GUALAQUIZA ECUADOR        M160 T94 R67 Z105 B129 E139

04 19 01 15 2025 -29.1 -178.5 4.5 KERMADEC ISLANDS NEW ZEALAND"  M96 T9 R145 Z21 B36 E42

04 19 01 12 2025  53.8 -164.1 3.5 ESE OF AKUTAN ALASKA           M78 T74 R66 Z103 B70 E79

 

April 19, 2025

 

An unusually large event of M 4.6 shook the area of Antigua and Barbuda today.  NEIC reported it was felt with intensity IV in Antigua and Barbuda at Cedar Grove and in Saint Kitts and Nevis at Basseterre, Newcastlr and Cotton Ground with III in Carlisle, Antigua and Barbuda and Mansion, Christ Church Saint Kitts and Nevis. It may have been felt as far as Floreida where it was reported with intensity II in Everglades-Monroe County.

This event occurred at local solar noon and was probably promoted by tidal and/or

geomagnetic effects which dominate near this hour.

The last earthquake within about 150 km of this epicenter in the area of

Antigua and Barbuda occurred as an M 4.9 on November 15, 2024 followied by an M 4.8 on November 16, 2024.

At the time this summary noted:

 

 

"A series of light to moderate earthquakes began today in the region of Antigua and Barbuda, Caribbean with M 4.9. NEIC reported maximum intensity V in Netherlands Antilles at Cul De Sac Sint; III in Antigua and Barbuda at Potters Village and Freetown and in Basseterre, Saint Kitts and Nevis with II in Guadeloupe, Saint Kitts and Nevis and Antigua and Barduda.

EMSC reported it was felt with moderate to strong motion in Codrington, Antigua and Barbuda and lightly in Guadeloupe at Baie-Mahault and Lamentin." (November 16, 2024)

 

The last earthquake in the Antigua and Barbuda area of significantly larger

magnitude than today's M 4.6 occurred as an M 5.2 on December 2, 2023. At the

time this summary noted:

 

"An M 5.3 and M 4.5 also continued the seismic swarm today in the Guadeloupe

region of the Leeward Islands, Caribbean. This had been noted in the previous

issue of this summary as:

 

 

"A series of moderate earthquakes also occurred today in the Guadeloupe Islands of The Leeward

Islands in the eastern Caribbean. The last strong earthquake in Guadeloupe

occurred as an M 6.2 on January 20, 2023. Aftershocks of magnitude around 5.0

occurred on February 2 and April 16, 2023. At the time of the mainshock in

January 2023 this summary noted:

 

 

"A strong earthquake of M 6.2 also occurred in the area of Guadeloupe today where it was

widely felt. NEIC reported maximum intensity IV in Guadeloupe in Basse-Terre at Le Gosier, Saint-Claude, Baie-Mahault, Petit-Bourg and II-III in Bouillant, Point-Noire, Sante-Rose, Lamentin, Terre-de-Bas and in Montserrat.

This earthquake occurred at intermediate focal depth of 166 km. Several foreshocks hit the area in the past week.

The last earthquake in the west Indies within about 300 km of today's event

of M 6.2 with equal or greater magnitude was an M 7.4 on November 29, 2007. Like today's

earthquake it occurred at an intermediate depth of 156 km about 250 km southeast

of today's epicenter. The last and only event within about 100 km of this epicenter

with equal or larger magnitude in the past 35 years was an M 6.2 on November 21, 2004." (January 21, 2023, December 2, 2023)

 

Today's event in the eastern Caribbean was probably also promoted by its antipodal

location to Tropical Storm Errol north of Australia. Near the time of this

event in Antigua and Barbuda TC Errol was located at:

 

"TC    ERROL    2025-04-18  06:00 UT  17.2S  119.4E  130 kts  North of Australia 

 

 

Tropical Cyclone Errol (29S) continued today in the area north of Australia with winds up to 130 kts.   The antipode of this epicenter is at 15N 60W.  The antipode of this epicenter will encounter the Leeward and Windward Islands  of the eastern Caribbean. Energy from this storm could enhance seismicity in that region around April 16-18, 2025 near (15N 60W) and later to the north near the Virgin Islands. These areas could experience seismic enhancement as TC Errol is antipodal. An earthquake today in Martinique at 15N 60W of M 4.0 was likely triggered by antipodal energy from TC Errol." (April 18, 2025)

 

The position of today's earthquake was given by EMSC as:

 

 

O: 18APR2025 17:31:23 17.6N  62.0W ML=4.6  EMSC   Codrington, Antigua and Barbuda.

 

This is within about 100 km of the exact antipode of TC Errol.

 

Two earthquakes of M 5.2 each also hit northern Colombia toeay. NEIC reported they were felt with intensity III in Colombia at Bogota and in Santander at Piedecuesta with II in San Gil and Floridablanca and Medellin, Antioquia.

 

NEIC reported an earthquake of M 4.1 in Santiago, Chile was felt with  intensity up to II-III in the area(s) of Santiago, Chile.

 

NEIC reported an earthquake of M 4.6 in Guerrero, Mexico was felt with  intensity up to II-III in the area(s) of Guerrero, Mexico in Tlalnepantla, Mexico.

 

NEIC reported an earthquake of M 5.4 in the Komandorsky Islands, Russia may have been felt with  intensity up to II-III in the area(s) of the Komandorsky Islands, Russia.

 

NEIC reported an earthquake of M 5.2 in Eastern Honshu, Japan was felt with  intensity up to II-III in the area(s) of Eastern Honshu, JapanEastern Honshu, Japan with V in Toyoshina, Nagano; IV in Anjo Aichi, and in Nagano at Marsumoto and Omachi and II-II in Gunma II in Aichi and Kanagawaand Niigata.

 

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 at Boonville with IV.

 

NEIC reported an earthquake of M 2.4 in Southern California was felt with  intensity up to II-III in the area(s) of Southern California with III in Julian and II in Escondido, Oceanside, Poway, Ramona.

 

 

TROPICAL CYCLONE 31P                 

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    31P      2025-04-19  00:00 UT  12.6S  140.2E  040 kts  South of New Guinea/ North of Australia

 

Tropical Cyclone 31P continued today in the area north of Australia with winds up to 40 kts.  It is expected to track to the south and east over the next several days. The antipode of this epicenter is at 12N 40W.  Energy from this storm could enhance seismicity in the region near the Mid-Atlantic ridge in the next several days.

 

 

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

7510       0410   0422      0429   C2.2      (April 18, 2025)   2.7E-03  

7530       0551   0601      0614   C1.8      (April 18, 2025)   2.5E-03  

7560       1203   1212      1220   C1.6      (April 18, 2025)   1.7E-03  

Kermadec M 4.2 12:37 UT

Santa Cruz M 4.5 12:35 UT

 

7590       2111   2117      2124   C1.4      (April 18, 2025)   6.1E-04  

7600       2148   2152      2156   C2.6      (April 18, 2025)   1.3E-03  

Kermadec M 4.9 22:03 UT

 

7630       2308   2350      0015   M4.4      (April 18, 2025)   8.8E-02      

Luzon M 4.5 23:33 UT

Kermadec M 4.5 01:15 UT

Guerrer0 M 5.0 01:15 UT

Myanmar M 4.2 01:20 UT

 

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  active April 19-21.  Solar M-flare chance: 40% X-class: 5% proton storm: 1%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    13 15 11 20:00 4  113 156

 

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS) and

TC Errol (EDIS). Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04 19 07 44 2025  35.3 -117.8 3.1 WSW OF JOHANNESBURG CA         M114 T76 R60 Z106 B93 E106

04 19 07 18 2025  61.2 -151.5 4.3 SOUTHERN ALASKA                M81 T83 R56 Z112 B80 E89

04 19 06 47 2025  36.2   71.2 5.7 SSW OF ASHKāSHAM AFGHANISTAN  M25 T121 R69 Z118 B85 E79

04 19 06 14 2025  31.7 -104.3 2.0 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105 E117

04 19 04 51 2025 -21.5  -66.9 4.6 SW OF ATOCHA BOLIVIA           M164 T97 R79 Z97 B133 E138

04 19 03 14 2025   2.5  -31.0 4.8 CENTRAL MID-ATLANTIC RIDGE"    M122 T139 R50 Z133 B175 E167

04 19 02 45 2025  39.1 -119.0 2.4 KM ENE OF YERINGTON            M111 T78 R58 Z108 B93 E105

04 19 02 20 2025  -3.5  -77.7 4.6 E OF GUALAQUIZA ECUADOR        M160 T94 R67 Z105 B129 E139

04 19 01 15 2025 -29.1 -178.5 4.5 KERMADEC ISLANDS NEW ZEALAND"  M96 T9 R145 Z21 B36 E42

04 19 01 12 2025  53.8 -164.1 3.5 ESE OF AKUTAN ALASKA           M78 T74 R66 Z103 B70 E79

04 18 23 56 2025  47.6 -122.0 2.4 CITY OF SAMMAMISH WASHINGTON   M102 T82 R54 Z112 B91 E103

04 18 22 03 2025 -28.8 -177.6 4.9 KERMADEC ISLANDS REGION"       M97 T9 R145 Z22 B36 E43

04 18 21 55 2025  19.4  -65.6 3.4 SUáREZ PUERTO RICO            M135 T113 R42 Z130 B141 E153

04 18 21 08 2025  41.9  144.3 4.2 ESE OF HIROO JAPAN             M44 T72 R85 Z90 B48 E52

04 18 20 56 2025 -39.3  176.3 4.2 BAY VIEW NEW ZEALAND           M96 T20 R156 Z10 B39 E42

04 18 20 53 2025  31.7 -104.3 2.4 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105 E117

04 18 20 48 2025  18.3  -68.8 4.1 LA ROMANA DOMINICAN REPUBLIC   M137 T109 R44 Z127 B138 E151

04 18 19 54 2025 -33.2  -70.1 4.1 CHICUREO ABAJO CHILE           M163 T89 R91 Z85 B124 E127

04 18 19 51 2025  21.4  120.3 4.5 SSW OF HENGCHUN TAIWAN         M22 T76 R102 Z79 B41 E37

04 18 19 42 2025  -6.2  151.8 4.9 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0 E12

04 18 19 40 2025  32.1 -101.9 2.0 WSW OF STANTON TEXAS           M123 T86 R53 Z113 B107 E119

04 18 19 18 2025  16.4  -98.7 4.6 SAN NICOLáS MEXICO            M139 T82 R62 Z105 B110 E122

04 18 18 41 2025  55.4  164.4 5.4 UST’-KAMCHATSK STARYY RUSSIA M60 T77 R71 Z101 B62 E69

04 18 18 40 2025  55.5  164.3 4.8 UST’-KAMCHATSK STARYY RUSSIA M59 T77 R71 Z101 B62 E69

04 18 18 30 2025  49.4 -120.5 2.0 SSE OF PRINCETON CANADA        M101 T83 R52 Z114 B93 E104

04 18 18 01 2025  20.4   96.1 4.1 YAMETHIN BURMA (MYANMAR)       M1 T96 R94 Z91 B60 E53

04 18 17 31 2025  17.6  -62.0 4.6 CODRINGTON ANTIGUA AND BARBUDA M135 T115 R42 Z131 B145 E157

04 18 17 14 2025 -41.4  -72.4 4.4 LA ENSENADA CHILE              M158 T85 R100 Z78 B117 E119

04 18 17 12 2025  54.5 -161.8 3.6 KING COVE ALASKA               M79 T75 R65 Z104 B71 E81

04 18 16 33 2025  33.1 -116.6 2.2 SSW OF JULIAN CA               M117 T76 R61 Z105 B94 E107

04 18 15 49 2025  -3.6  145.2 4.5 ANGORAM PAPUA NEW GUINEA       M54 T43 R130 Z46 B6 E8

04 18 15 16 2025  21.6  143.1 4.4 MARIANA ISLANDS REGION"        M43 T59 R105 Z71 B28 E32

04 18 14 41 2025  31.7 -104.3 2.2 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105 E117

04 18 14 26 2025 -16.0 -174.8 4.9 W OF HIHIFO TONGA              M95 T4 R133 Z34 B34 E44

04 18 13 25 2025  43.5 -110.6 2.9 E OF JACKSON WYOMING           M110 T85 R50 Z116 B99 E111

04 18 13 01 2025  31.7 -104.3 3.3 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105 E117

04 18 12 37 2025 -31.2  179.6 4.2 KERMADEC ISLANDS REGION"       M96 T12 R148 Z18 B36 E41

04 18 12 35 2025 -11.5  166.3 4.5 LATA SOLOMON ISLANDS           M76 T20 R136 Z35 B15 E25

04 18 11 35 2025  47.4 -113.0 2.2 NNE OF OVANDO MONTANA          M106 T86 R49 Z117 B97 E109

04 18 11 28 2025  31.7 -104.3 2.3 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105 E117

04 18 11 19 2025  36.5  137.9 5.2 ENE OF ÅŒMACHI JAPAN           M39 T72 R90 Z86 B44 E47

04 18 10 31 2025   6.8  -73.1 5.2 NNE OF JORDáN COLOMBIA        M149 T102 R56 Z115 B135 E147

04 18 10 21 2025  39.0 -123.4 2.6 NW OF BOONVILLE CA             M109 T75 R60 Z106 B89 E101

04 18 09 55 2025  33.1 -116.6 2.5 SW OF JULIAN CA                M117 T76 R61 Z105 B94 E107

04 18 08 59 2025  52.9 -167.6 3.2 E OF NIKOLSKI ALASKA           M76 T73 R68 Z101 B68 E77

04 18 08 48 2025   6.7  -73.1 4.8 SSW OF JORDáN COLOMBIA        M149 T102 R56 Z115 B135 E147

04 18 07 58 2025  -6.2  151.4 4.9 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0 E12

04 18 07 33 2025  -6.2  151.6 4.7 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0 E12

04 18 07 28 2025  19.2  -66.0 3.4 SAN JUAN PUERTO RICO           M135 T112 R42 Z129 B141 E153

04 18 07 24 2025  -6.2  151.6 5.1 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0 E12

04 18 06 42 2025  45.1 -124.3 2.5 LINCOLN CITY OREGON            M103 T79 R57 Z110 B89 E101

04 18 06 33 2025  19.4 -108.9 4.3 REVILLA GIGEDO ISLANDS REGION" M132 T74 R66 Z100 B100 E113

04 18 05 16 2025  54.9 -160.0 3.1 SAND POINT ALASKA              M80 T75 R64 Z105 B72 E82

04 18 05 07 2025  43.5 -110.6 3.9 E OF JACKSON WYOMING           M110 T85 R50 Z116 B99 E111

04 18 03 59 2025 -36.5  -70.9 4.7 LAS OVEJAS ARGENTINA           M161 T88 R95 Z82 B121 E124

04 18 03 44 2025  -7.1  129.2 4.7 LOSPALOS TIMOR LESTE           M43 T56 R132 Z50 B22 E11

04 18 02 57 2025  -6.3  147.9 4.5 FINSCHHAFEN PAPUA NEW GUINEA   M58 T39 R133 Z43 B3 E9

04 18 02 36 2025  19.1  -68.4 3.9 PUNTA CANA DOMINICAN REPUBLIC  M136 T110 R43 Z127 B138 E151

04 18 02 36 2025  17.2  -68.7 3.0 DE YUMA DOMINICAN REPUBLIC     M138 T109 R45 Z126 B138 E151

04 18 02 13 2025  -9.8  114.0 4.5 SSW OF MUNCAR INDONESIA        M36 T69 R129 Z57 B37 E25

04 18 00 12 2025  31.6 -104.5 2.2 WHITES CITY NEW MEXICO         M123 T84 R55 Z111 B104 E117

04 18 00 10 2025 -23.5  -68.1 5.6 PEDRO DE ATACAMA CHILE         M165 T95 R82 Z94 B131 E136

 

 

April 18, 2025

 

With today's calming of the geomagnetic storm of the past two days, global

seismicity returned to temporarily relative quiet. This is not expected to

last long, perhaps being broken when ionospheric ring currents re-energize

around April 20-22. The most likely strong to major earthquake at that

time could occur about 10 degrees either side of the geomagnetic equator.

Some of this may be foreshadowed today with an M 5.6 in Atacama, Chile

and enhanced seismicity throughout much of South and Central  America including an M 5.0

in Colombia and M 4.7 in Maule, Chile. As South America has been relatively

quiet through much of the strong seismicity since late March, 2025 and the

solar eclipse of March 29, this resumption of moderate earthquakes may

be a significant change. The geomagnetic equator runs through South America

in the area of central and southern Peru and seismicity in this area often

appears to be enhanced several days following major geomagnetic storms.

 

NEIC reported the M 5.6 in Atacama, Northern Chile was felt with intensity II in Tacna, southern Peru and lightly in Iquique, Tarapaca, Chile.

EMSC reported moderate shaking in Chile at Calama, Antofagasta, Sierra Gorda, Tocopilla, and Iquique.

 

This is the largest earthquake in the Atacama region of Chile within about 150 km

of this epicenter since an M 6.1 on March 6, 2025. A major M 7.4 hit

near today's epicenter on July 19, 2024. At the time this summary noted:

 

"The strongest earthquake in the world today was an M 7.4 in northern Chile. NEIC reported it was felt with intensity up to VII with

some damage in the Atacama, Chile region near San Pedro de Atacama.

EMSC reported strong and long shaking in Atacama, Chile in San Pedro de Atacama, Calama, Sierra Gorda, Antofagasta, Tocopilla, Mejillones, Alto Hospicio, Iquique, Chanaral, Copiapo, Arica, Paiguano, Arequipa, with light shaking in Coquimbo, Valparaiso, Vina del Mar, Nunoa, Macul and others.

This is the strongest earthquake in the world since an M 7.4 in Taiwan in early

April. The last earthquake within about 300 km of today's epicenter with

M>=7.4 occurred on November 14, 2007 with M 7.7. The only other such event

in the general area of today's epicenter of equal or larger magnitude in the

past 35 years was an M 8.0 on July 30, 1995." (July 19, 2024)

 

Forecast 171581 had expected enhanced seismicity within about 100 km of this

epicenter was likely around April 19.

 

                                         

O: 18APR2025 00:10:18 23.5S  68.1W ML=5.6  ANSS   Atacama, Chile        

P: 19APR2025 171581   23.0N  67.0W 4.0-5.6 AAAAA  Argentina         

 

CSN reported the following parameters for this and an event in Bio-Bio today:

 

18-04-2025  00:10  23.47S 68.22W 139  5.7    IV   Antofagasta at Mejillones, Sierra Gorda, San Pedro de Atacama, Tocopilla; III in Antofagasta, Calama, and in Atacama with III in Diego de Almagro and El Salvador, Chile.

 

NEIC reported the earthquake of M 4.8-5.0 in Colombia was felt with  intensity up to II-III in the area(s) of Colombia with intensity III in Bucaramanga, Santander and II in Envigado, Antioquia.

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in the Tetons of Wyoming. NEIC reported it was felt with intensity III in Jackson and Wilson, Wyoming and II in Lander, Wyoming and III in Idaho at Driggs and II in Idaho Falls.

The last earthquake with M>=3.9 within about 100 km of Jackson, Wyoming was

recorded as an M 4.8  on August 27, 2016. At the time this summary noted:

 

 

"A moderate earthquake of M 4.8 in the Grand Teton area of Wyoming was widely felt today.

NEIC reported this earthquake was felt with maximum intensity IV in Wyoming at Bondurant and Cora,  and with lesser intensity

within about 200 km of the epicenter. Intensity II-III shaking was reported from

Wyoming at Jackson about 35 km from the epicenter where 250 people reported felt effects to NEIC.

Other communities reporting light shaking in Wyoming included Daniel, Kelly, Etna, Grover, Wilson, Pinedale, Freedom, Dubois, Bedford, Thayne, Auburn, Alta, Moran, Moose, Cody, Lander, Yellowstong National Park, Green River, Thermopolis, Rock Springs and Evanston; and in Idaho at Idaho Falls, Victor, Driggs, Tetonia, Soda Springs, Idaho Falls, Ashton, Rexburg and Rigby, among others. 

Moderate earthquakes in this area are not unknown but the region has been quiet

for an appreciable amount of time. This earthquake is the latest in a series

of event along the front range of the Rocky Mountains which has included light

earthquakes in Colorado near Trinidad, Pueblo and Greeley and appears to be

migrating to the north with this event in Wyoming.

 

...

 

This is the strongest earthquake in this region since an M 4.8 on August 5, 2010. The last of larger magnitude was

an M 5.0 twelve years ago on January 7, 2004. A series of events occurred

in the area following the Northridge California event in January, 1994. This

continued from February through April, 1994." (August 27, 2016)

 

Forecast 171526 had expected today's event in Wyoming was likely within about

50 km of this epicenter around April 17, 2025.

                                         

O: 18APR2025 05:07:14 43.4N 110.5W ML=3.9  ANSS   Jackson, Wyoming      

P: 17APR2025 171526   43.0N 111.0W 2.0-4.2 AAAAA  Yellowstone/Wyoming           

 

A highly unusual earthquake of M 4.8 occurred today in the area of South Africa near Klerksdorp.

EMSC reported it was felt with moderate intensity in North West Province, South Africa at Klerksdorp, Matlosana, Johannesburg.

The last earthquake in South Africa within about 250 km of this epicenter

with M>=4.8 occurred on June 11, 2023 with M 5.0 but the last earthquake in the

area of significantly larger magnitude was an  M 5.2 on April 3, 2017. At the time

this summary noted:

 

 

"A rare moderate earthquake of M 5.2 hit near Stilfontein, South Africa today.

NEIC reported it was felt with intensity VI in Kerksdorp, North West and IV in Potchefstroom, North West and III in Johannesburg, Gauteng, South Africa.

EMSC reported a loud earthquake noise which with the shaking woke many in Stilfontein, Kroonstad, Krugersdorp, Randburg, Germiston, Centurion, Pretoria, South Africa. This epicenter is in the antipodal area of the M 4.5 in Hawaii which occurred

on March 23. This report has previously linked seismicity in these two areas

due to their antipodal locations. The epicenter lies about 15 degrees south of

the geomagnetic equator and the current strong geomagnetic storm may have helped

promote this event. The last earthquake within about 200 km of this epicenter

in South Africa with M>=5.2 was an M 5.2-5.4 on August 5, 2014. The largest

earthquake in the region in the past 25 years was an M 5.7 on April 22, 1999. This

event also followed a moderately strong earthquake in Hawaii. The only other

such event in South Africa in the past 25 years was an M 5.2 on February 10, 1997." (April 3, 2017)

 

Forecast 171587 had expected today's event was likely  within about 100 km

of this epicenter around April 19, 2025.

 

O: 17APR2025 08:57:30 26.9S  26.7E ML=4.8  EMSC   South Africa          

P: 19APR2025 171587   26.0S  28.0E 3.0-4.4 AAAAA  Rep. South Africa             

 

 

NEIC reported an earthquake of M 4.7 in Argentina was felt with  intensity up to II-III in the area(s) of Argentina in Bio Bio Chile at Talcahuano.

EMSC reported strong shaking in Chile at Coihueco, San Ignacio, San Clemente, Talca, Cabrer0, Curico, Constitucion, Concepcion, Estacion Central.

 

CSN reported the following parameters for this event in Bio-Bio today:

 

18-04-2025  03:59  36.44S 71.05W 139  4.8   III   Maule at Talca, Cauquenes, San Javier, Hualane; II in Sagrada Familia, Linares, Llico, Constitucion, Pencahue, and in Nuble with III in Chillan and II in Yungay and Ranquil, Chile.

 

NEIC reported an earthquake of M 4.5 south of Bali   was felt with  intensity up to II-III in the area(s) of  Bali with IVin Ubud and III in Kuta, Indonesia.

EMSC reported moderate shaking woke people in Ubud, Indonesia.

 

 

TROPICAL CYCLONE 31P                 

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    31P      2025-04-18  00:00 UT  11.2S  139.7E  045 kts  South of New Guinea/ North of Australia

 

Tropical Cyclone 31P formed today in the area north of Australia with winds up to 45 kts.  It is expected to track to the south and east over the next several days. The antipode of this epicenter is at 11N 41W.  Energy from this storm could enhance seismicity in the region near the Mid-Atlantic ridge in the next several days.

 

 

TROPICAL CYCLONE ERROL (29S)                 

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    ERROL    2025-04-18  00:00 UT  16.0S  123.9E  050 kts  North of Australia 

 

Tropical Cyclone Errol (29S) continued today in the area north of Australia with winds up to 50 kts.   The antipode of this epicenter is at 16N 56W.  Energy from this storm could enhance seismicity in the region near the eastern Caribbean but with the turn to the southeast of TC Errol, the danger of a moderate earthquake in this area has been greatly reduced.

 

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

7360       0458   0505      0508   C1.5      (April 17, 2025)   8.4E-04  

7390       0932   0946      0952   C2.8      (April 17, 2025)   2.5E-03  

Galapagos M 5.2 09:45 UT

 

7400       1401   1405      1411   C2.5      (April 17, 2025)   7.5E-04  

7410       1411   1422      1434   C4.6      (April 17, 2025)   5.6E-03  

El Salvador M 4.2 14:24 UT

Oaxaca M 4.0 14:14 UT

 

7440       2144   2153      2200   C1.5      (April 17, 2025)   4.0E-04  

7450       2200   2204      2206   C2.1      (April 17, 2025)   9.1E-04  

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  active April 18 disturbed April 19-20.  Solar M-flare chance: 55% X-class: 10% proton storm: 1%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    11  7 11 03:00 4  118 151

 

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS) and

TC Errol (EDIS). Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04 18 08 48 2025   6.7  -73.1 4.8 SSW OF JORDáN COLOMBIA        M149 T102 R56 Z115 B135 E164

04 18 07 33 2025  -6.2  151.6 4.7 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0 E33

04 18 07 28 2025  19.2  -66.0 3.4 SAN JUAN PUERTO RICO           M135 T112 R42 Z129 B141 E174

04 18 07 24 2025  -6.2  151.6 5.1 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0 E33

04 18 06 33 2025  19.4 -108.9 4.3 REVILLA GIGEDO ISLANDS REGION" M132 T74 R66 Z100 B100 E134

04 18 05 07 2025  43.5 -110.6 3.9 E OF JACKSON WYOMING           M110 T85 R50 Z116 B99 E129

04 18 03 59 2025 -36.5  -70.9 4.7 LAS OVEJAS ARGENTINA           M161 T88 R95 Z82 B121 E126

04 18 03 44 2025  -7.1  129.2 4.7 LOSPALOS TIMOR LESTE           M43 T56 R132 Z50 B22 E13

04 18 02 57 2025  -6.3  147.9 4.5 FINSCHHAFEN PAPUA NEW GUINEA   M58 T39 R133 Z43 B3 E29

04 18 02 36 2025  19.1  -68.4 3.9 PUNTA CANA DOMINICAN REPUBLIC  M136 T110 R43 Z127 B138 E172

04 18 02 36 2025  17.2  -68.7 3.0 DE YUMA DOMINICAN REPUBLIC     M138 T109 R45 Z126 B138 E172

04 18 02 13 2025  -9.8  114.0 4.5 SSW OF MUNCAR INDONESIA        M36 T69 R129 Z57 B37 E7

04 18 00 12 2025  31.6 -104.6 2.4 VAN HORN TEXAS                 M123 T84 R55 Z111 B104 E137

04 18 00 10 2025 -23.5  -68.1 5.6 PEDRO DE ATACAMA CHILE         M165 T95 R82 Z94 B131 E140

04 18 00 01 2025  -6.3  151.4 4.8 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0 E33

04 17 23 45 2025  36.7 -121.5 2.0 WSW OF RIDGEMARK CA            M111 T75 R61 Z105 B90 E122

04 17 22 31 2025  33.1 -116.6 2.6 SSW OF JULIAN CA               M117 T76 R61 Z105 B94 E127

04 17 21 57 2025  66.2 -142.6 3.0 NORTHERN ALASKA                M81 T89 R50 Z119 B85 E107

04 17 21 27 2025  22.7   96.1 4.3 SHWEBO BURMA (MYANMAR)         M0 T97 R92 Z93 B61 E44

04 17 21 25 2025  49.4 -120.5 2.2 S OF PRINCETON CANADA          M101 T83 R52 Z114 B93 E121

04 17 20 09 2025  -7.0  130.5 4.4 WSW OF TUAL INDONESIA          M44 T55 R132 Z49 B21 E14

04 17 20 03 2025  40.3 -124.8 2.3 W OF PETROLIA CA               M107 T75 R60 Z106 B88 E120

04 17 19 43 2025  33.0 -116.6 2.3 SSE OF JULIAN CA               M117 T76 R61 Z105 B94 E127

04 17 19 31 2025  52.5  -34.1 4.6 REYKJANES RIDGE"               M94 T135 R1 Z165 B133 E137

04 17 18 57 2025  39.1 -119.0 2.6 KM ENE OF YERINGTON            M111 T78 R58 Z108 B93 E124

04 17 18 17 2025  51.9 -169.4 4.2 SSW OF NIKOLSKI ALASKA         M75 T71 R69 Z100 B66 E91

04 17 17 59 2025  37.5 -117.5 2.4 SSE OF SILVER PEAK             M112 T78 R58 Z108 B94 E126

04 17 16 01 2025  -6.4  151.9 4.7 KIMBE PAPUA NEW GUINEA         M61 T35 R133 Z41 B0 E33

04 17 15 46 2025  31.6 -104.5 2.0 WHITES CITY NEW MEXICO         M123 T84 R55 Z111 B104 E137

04 17 11 12 2025  37.2 -118.2 2.6 BIG PINE CA                    M112 T77 R59 Z107 B93 E125

04 17 10 13 2025  33.5 -116.6 2.5 SE OF ANZA CA                  M116 T76 R60 Z105 B94 E127

04 17 09 45 2025   2.2  -96.5 5.2 THE GALAPAGOS ISLANDS          M153 T78 R72 Z96 B111 E142

04 17 07 50 2025  39.7 -120.2 2.1 ENE OF LOYALTON CA             M109 T77 R58 Z108 B92 E123

04 17 07 26 2025  -8.7  126.9 4.9 LOSPALOS TIMOR LESTE           M43 T58 R132 Z50 B24 E10

04 17 06 32 2025  22.1   96.1 4.5 MANDALAY BURMA (MYANMAR)       M0 T97 R92 Z92 B61 E44

04 17 04 34 2025 -11.2  115.8 5.2 NUSA DUA INDONESIA             M38 T67 R131 Z55 B35 E5

04 17 03 56 2025 -19.0  -67.4 4.4 WSW OF CHALLAPATA BOLIVIA      M164 T98 R77 Z98 B134 E144

04 17 02 11 2025  52.4 -174.5 4.0 NW OF ATKA ALASKA              M72 T72 R70 Z100 B64 E88

04 17 01 50 2025  47.4 -113.0 2.5 NNE OF OVANDO MONTANA          M106 T86 R49 Z117 B97 E127

04 17 01 14 2025 -17.2 -173.2 4.9 SSE OF HIHIFO TONGA            M97 T3 R133 Z34 B36 E64

04 17 00 51 2025   0.4  124.8 5.6 ESE OF MODISI INDONESIA        M35 T63 R123 Z59 B27 E17

 

 

April 17, 2025

 

A severe geomagnetic storm began today about 16:00 UT (April 16). It reached

maximum Planetary Kp of 8 around 22:00-23:00 UT. The last geomagnetic storm

of greater disturbance occurred on January 1, 2025 with A-index (planetary)

of 86. Today's AP index reached 77. A major earthquake of M 7.1 followed the January 1, 2025 storm

on January 7, 2025 in the area of Xizang, China. Severe storms of this

type can trigger enhanced seismicity at the time of commencement (see previous

issue of this summary) or after ring currents re-develop up to a week after

the initiation of the storm.  Strong earthquakes followed the January 1, 2025

storm in the next seven days in the South Sandwich Islands (M 6.1); Iquique, Chile (M 6.1)

Ethiopia (M 5.7); Guatemala M 6.2 and M 5.8 and Xizang M 7.1. A similar set

may occur following today's storm especially around April 20-24, 2025.

 

The strongest earthquake in the world today occurred as an M 5.6 in Minahasa, Indonesia. NEIC reported it was probably felt with intensity IV in the epicentral area.

This event occurred at the peak of a severe geomagnetic storm which reached

Kp levels greater than 8 about the time of this event according to NOAA.

It is located near the geomagnetic equator and was probably triggered by

geomagnetic fluctuations associated with the storm. The last earthquake in the

Minahasa area within about 200 km of this epicenter with M>=5.6 occurred

was an M 6.1 on February 25, 2025. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.1 in the region of Sulawesi, Indonesia. NEIC reported it was felt with intensity III in Manado, Sulawesi, Indonesia.

It was followed by a strong series of aftershocks - many of which were lightly felt in the area." (February 25, 2025)

 

While most large earthquakes in this area are limited to magnitudes less than

M 6.2 an M 6.3 did occur on June 30, 2004. At the time this summary noted:

 

 

"The earthquake in Sulawesi of M 6.3 was reported by the Jakarta Post as being

felt in Manado and is the strongest in the region since an M 7.1 on Feb. 24, 2001 to the east of today's earthquake

and an M 7.6 on May 4, 2000 to the southwest. While no reports of damage

are currently available, this size earthquake may have done damage in the

epicentral area. The last event in the area which was similar to today's in magnitude occurred on Oct. 18, 2003 with M 6.3-6.44" (June 30, 2024)

 

The mainshock was preceded by several foreshocks and a strong series of moderate aftershocks.

 

Forecast 171343 had expected today's activity in Minahasa was likely within

about 100 km around April 16, 2025.

 

O: 17APR2025 00:51:25 00.4N 124.9E ML=5.6  EMSC   Minahasa Sulawesi, Indonesia

P: 16APR2025 171343   01.0N 124.0E 4.0-5.5 AAAAA  Mindanao, Philippines         

 

An M 5.6 also occurred in the southern mid-Atlantic Ridge today. It was not

reported felt in this remote epicentral area. This event is located in the

South Atlantic magnetic anomaly zone and was likely triggered by effects

from the strong geomagnetic storms currently in progress.

 

The last earthquake within about 250 km of this event in the southern Mid-Atlantic

region occurred on June 14, 2024 with M 5.9. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 5.9 in the southern Mid-Atlantic.

This event is located in the South Atlantic Geomagnetic Anomaly zone and follows

several unusual events in the area in recent months. When an M 6.0 hit this anomalous

area on December 15, 2023 this summary noted:

 

"A series of three moderate to large earthquakes occurred in the area of the South Atlantic today

in the general area of Tristan da Cunha. These events of M 6.0, 5.3 and 5.3

occurred in an area where tidal stresses with the new moon were strong and may have

been promoted from tidal stresses. They also occurred at a maximum of the

current geomagnetic storm (Kp was 6 at high latitudes at 20:00 UT today). This area is often considered the third geomagnetic

pole of the earth in an area called the "South Atlantic Anomaly" where the

geomagnetic field behaves in unusual ways. Planes and satellites experience

geomagnetic anomalies in this area and often must be routed around the area

to avoid complications from mal-functioning instruments and/or sudden changes

in orbital altitude due to geomagnetic field changes and accompanying

ionospheric density changes." (December 15, 2023)

 

The last earthquake of moderate or large magnitude in the area occurred as an M 4.9

on May 18, 2024. At the time this summary noted:

 

"Unusual seismicity also continued today near the South Atlantic geomagnetic anomaly.

An M 4.9 near the center of this anomaly occurred today in the southern Mid-Atlantic Ridge.

This is the strongest earthquake within about 300 km of this epicenter since

an M 5.0 on December 15, 2023. The last earthquake in this area with significantly

larger magnitude was an M 5.5 on March 3, 2023 about 200 km north of today's

epicenter. A similar event of M 5.3 occurred north of this on May 15, 2024" (May 17, 2024) and

 

This earthquake was closely associated with a strong M7.3 solar flare (#3480).

 

...

 

At M 5.9 the event in the southern Mid-Atlantic Ridge today is the strongest

event within about 300 km of this epicenter since an M 5.9 on March 22, 2011 -

the only such earthquake in this area in at least 35 years. At the time of

that event this summary noted:

 

 

"A strong earthquake in the South Atlantic Ocean followed the strong earthquakes

off Honshu today. This earthquake was M 6.1-6.4 and was followed by an aftershock

of M 5.1. It is the strongest earthquake in this region since an M 6.5

on February 16, 2005 and the fourth of M>6 in the area in the past 20 years.

This event is in a remote oceanic area and it is unlikely to have triggered

a tsunami or to have been felt in populated areas. The epicenter is in

the antipodal area to the great earthquakes in Japan and it is likely

to have been promoted by those events. Seismic energy is concentrated

by the spherical shape of the earth at the opposite point on the earth

to the epicenter of great quakes. It is not uncommon to see unusual activity

at the antipode due to this concentration of seismic energy." (March 22, 2011, June 14, 2024)

 

Today's event in the South Atlantic was also associated with a moderate C2.4 class solar flare.

Data on this flare from SWPC follow.

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

7130       1223   1234      1239   C2.4      (April 16, 2025)   1.9E-03      

Southern Mid-Atlantic M 5.6 12:41 UT

 

 

 

Forecast 171611 had expected elevated levels of seismicity in this area

in mid-April.

 

O: 16APR2025 12:41:02 32.5S  14.2W ML=5.6  EMSC   Southern Mid-Atlantic Ridge  

P: 11APR2025 171611   44.0S  16.0W 4.0-5.9 BDBAA  So. Mid-Atlantic Ridge        

 

A highly unusual earthquake of M 4.8 occurred today in the area of South Africa near Klerksdorp.

EMSC reported it was felt with moderate intensity in North West Province, South Africa at Klerksdorp, Matlosana, Johannesburg.

The last earthquake in South Africa within about 250 km of this epicenter

with M>=4.8 occurred on June 11, 2023 with M 5.0 but the last earthquake in the

area of significantly larger magnitude was an  M 5.2 on April 3, 2017. At the time

this summary noted:

 

 

"A rare moderate earthquake of M 5.2 hit near Stilfontein, South Africa today.

NEIC reported it was felt with intensity VI in Kerksdorp, North West and IV in Potchefstroom, North West and III in Johannesburg, Gauteng, South Africa.

EMSC reported a loud earthquake noise which with the shaking woke many in Stilfontein, Kroonstad, Krugersdorp, Randburg, Germiston, Centurion, Pretoria, South Africa. This epicenter is in the antipodal area of the M 4.5 in Hawaii which occurred

on March 23. This report has previously linked seismicity in these two areas

due to their antipodal locations. The epicenter lies about 15 degrees south of

the geomagnetic equator and the current strong geomagnetic storm may have helped

promote this event. The last earthquake within about 200 km of this epicenter

in South Africa with M>=5.2 was an M 5.2-5.4 on August 5, 2014. The largest

earthquake in the region in the past 25 years was an M 5.7 on April 22, 1999. This

event also followed a moderately strong earthquake in Hawaii. The only other

such event in South Africa in the past 25 years was an M 5.2 on February 10, 1997." (April 3, 2017)

 

Forecast 171587 had expected today's event was likely  within about 100 km

of this epicenter around April 19, 2025.

 

O: 17APR2025 08:57:30 26.9S  26.7E ML=4.8  EMSC   South Africa          

P: 19APR2025 171587   26.0S  28.0E 3.0-4.4 AAAAA  Rep. South Africa             

 

A pair of moderate earthquakes also occurred in the southern Kermadec Islands of New Zealand with M 5.4 and 5.3 today. NEIC reported likely intensity II in the epicentral area.

 

The strongest earthquake in the U.S. or Canada or vicinity today was an M 4.3

in the northern Gulf of California. It was not reported felt in this area.

Several earthquakes of similar magnitude also occurred south of this epicenter

in the Gulf of California today (see earthquake list below).

 

The last earthquake within about 100 km of this epicenter in the Gulf of California

with M>=4.3 was listed by NEIC as an M 4.3 and M 4.6 on July 16, 2023. At the

time this summary noted:

 

 

"A strong swarm of earthquakes also occurred today in Baja and the Gulf of

California, Mexico. The strongest earthquakes in this series occurred within

minutes of local solar noon with M 4.6 and 4.3 but the series began with smaller

event including an M 4.0 shortly after the M 7.2 in the Alaska Peninsula.

NEIC reported the earthquake of M 4.6 in the Gulf of California, Mexico was felt with intensity II-III in the area(s) of  Sonora, Mexico in Puerto Penasco (VI) and Sonoita; in San Felipe, Baja California and in Arizona at Somerton (IV), Wellton, and Sells.

Several moderate earthquakes including an M 4.2 were also felt in Baja California today. These were felt lightly in Baja California at Tijuana.

This activity was probably triggered by strong tidal stresses with the

new moon of July 17." (July 16, 2023)

 

Today's earthquake in the Gulf of California occurred near local solar midnight

and may have been promoted by the current geomagnetic storms and/or strong

tidal stresses which maximize near this hour.

  

Forecast 171587 had expected today's event in the Gulf of California was

likely within about 50 km of the epicenter around April 16.

 

O: 16APR2025 07:00:48 30.8N 114.2W ML=4.3  EMSC   Gulf of California    

P: 16APR2025 171587   31.2N 114.5W 2.0-4.0 AAAAA  SW U.S.A.                    

 

 

NEIC reported an earthquake of M 4.5 in Myanmar was felt with  intensity up to II-III in the area(s) of Myanmar with V in Maymyo and IV in Mandalay. It was also reported lightly felt as far as Bangkok, Thailand.

EMSC reported it was felt lightly in Myanmar at Patheingyi, Mandalay, Pyinoolwin, and Thegon.

 

NEIC reported an earthquake of M 3.7 in Baja California was felt with  intensity up to II-III in the area(s) of Baja California near Ensenada (IV) and in Southern California near San Diego (III-IV).

 

 

NEIC reported earthquakes of M 3.0 and M 3.2 off the coast of northern California  was felt with  intensity up to II-III in the area(s) of northern California at Myers Flat with intensity III.

 

 

NEIC reported an earthquake of M 2.9 in east-central California was felt with  intensity up to II-III in the area(s) of east-central California with II in Markleeville.

 

EMSC reported an earthquake of M 4.4 in Sumbawa, Indonesia was felt with  intensity up to IV in the area(s) of Sumbawa, Indonesia at Plampang.

 

TROPICAL CYCLONE ERROL (29S)                 

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    ERROL    2025-04-17  00:00 UT  15.2S  119.4E  130 kts  North of Australia 

 

Tropical Cyclone Errol (29S) continued today in the area north of Australia with winds up to 130 kts.   The antipode of this epicenter is at 15N 60W.  The antipode of this epicenter will encounter the Leeward and Windward Islands  of the eastern Caribbean. Energy from this storm could enhance seismicity in that region around April 16-18, 2025 near (15N 60W) and later to the north near the Virgin Islands. These areas could experience seismic enhancement as TC Errol is antipodal. An earthquake today in Martinique at 15N 60W of M 4.0 was likely triggered by antipodal energy from TC Errol.

 

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

7090       0418   0439      0504   C8.1      (April 16, 2025)   1.7E-02      

Fiji M 4.2 04:31 UT

Mindanao M 4.0 05:02 UT

 

7130       1223   1234      1239   C2.4      (April 16, 2025)   1.9E-03      

Southern Mid-Atlantic M 5.6 12:41 UT

 

7150       1504   1508      1513   C1.7      (April 16, 2025)   9.7E-04  

Coast of No. California M 3.6 15:04 UT

 

7260       2341   2354      0006   C3.1      (April 16, 2025)   3.6E-03  

Minahas M 5.6 00:51 UT

 

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  active April 18 minor storms 17 disturbed April 19.  Solar M-flare chance: 60% X-class: 10% proton storm: 1%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    77 63 43 23:00 8   58 148

 

A severe geomagnetic storm began today about 16:00 UT (April 16). It reached

maximum Planetary Kp of 8 around 22:00-23:00 UT. The last geomagnetic storm

of greater disturbance occurred on January 1, 2025 with A-index (planetary)

of 86. Today's AP index reached 77. A major earthquake of M 7.1 followed this

storm on January 7, 2025 in the area of Xizang, China. Severe storms of this

type can trigger enhanced seismicity at the time of commencement (see previous

issue of this summary) or after ring currents re-develop up to a week after

the initiation of the storm.  Strong earthquakes followed the January 1, 2025

storm in the next seven days in the South Sandwich Islands (M 6.1); Iquique, Chile (M 6.1)

Ethiopia (M 5.7); Guatemala M 6.2 and M 5.8 and Xizang M 7.1. A similar set

may occur following today's storm especially around April 20-24, 2025.

 

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS) and

TC Errol (EDIS). Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04 17 07 26 2025  -8.7  126.9 4.9 LOSPALOS TIMOR LESTE           M43 T58 R132 Z50 B24 A10

04 17 06 32 2025  22.1   96.1 4.5 MANDALAY BURMA (MYANMAR)       M0 T97 R92 Z92 B61 A44

04 17 04 34 2025 -11.2  115.8 5.2 NUSA DUA INDONESIA             M38 T67 R131 Z55 B35 A5

04 17 03 56 2025 -19.0  -67.4 4.4 WSW OF CHALLAPATA BOLIVIA      M164 T98 R77 Z98 B134 A144

04 17 01 14 2025 -17.2 -173.2 4.9 SSE OF HIHIFO TONGA            M97 T3 R133 Z34 B36 A64

04 17 00 51 2025   0.4  124.8 5.6 ESE OF MODISI INDONESIA        M35 T63 R123 Z59 B27 A17

04 16 23 55 2025  35.3 -117.9 2.2 CALIFORNIA CITY CA             M114 T76 R60 Z106 B93 A125

04 16 23 53 2025  47.4 -117.9 2.4 NE OF SPRAGUE WASHINGTON       M104 T84 R52 Z114 B94 A123

04 16 21 53 2025  41.2 -116.7 2.8 KM NE OF VALMY, NEVADA         M110 T80 R55 Z111 B95 A126

04 16 21 51 2025  41.2 -116.7 2.3 KM NE OF VALMY, NEVADA         M110 T80 R55 Z111 B95 A126

04 16 20 44 2025  32.2 -103.1 2.6 JAL NEW MEXICO                 M123 T85 R53 Z113 B106 A138

04 16 20 43 2025  44.3 -113.2 2.5 SSE OF LEADORE IDAHO           M108 T84 R51 Z115 B97 A127

04 16 20 08 2025 -33.7 -179.1 4.7 THE KERMADEC ISLANDS           M97 T14 R149 Z17 B38 A58

04 16 20 03 2025  35.2 -120.2 2.2 NE OF NIPOMO CA                M113 T75 R61 Z105 B91 A124

04 16 19 21 2025  34.2   86.4 4.1 WESTERN XIZANG"                M14 T108 R78 Z107 B73 A58

04 16 18 59 2025  32.1 -116.1 3.7 ENSENADA B.C. MX               M118 T75 R61 Z105 B95 A127

04 16 18 57 2025  -0.7  127.5 4.6 SE OF LABUHA INDONESIA         M38 T60 R125 Z56 B24 A17

04 16 18 14 2025  11.8  141.6 4.9 NNE OF FAIS MICRONESIA         M44 T54 R115 Z62 B20 A35

04 16 17 44 2025 -33.9 -179.4 5.4 THE KERMADEC ISLANDS           M97 T14 R150 Z16 B38 A57

04 16 17 35 2025 -33.8 -179.5 5.3 THE KERMADEC ISLANDS           M97 T14 R149 Z16 B38 A57

04 16 17 07 2025  30.9 -103.0 1.6 FORT STOCKTON TEXAS            M124 T84 R54 Z112 B106 A138

04 16 17 03 2025  40.4 -125.0 3.2 WNW OF PETROLIA CA             M107 T75 R60 Z106 B88 A119

04 16 15 44 2025  40.4 -125.1 3.0 WNW OF PETROLIA CA             M107 T75 R60 Z106 B88 A119

04 16 15 37 2025  53.9 -168.0 4.1 DUTCH HARBOR ALASKA            M76 T74 R67 Z102 B68 A93

04 16 15 04 2025  40.4 -125.0 3.6 KM WNW OF PETROLIA             M107 T75 R60 Z106 B88 A119

04 16 14 23 2025  48.8 -119.5 3.1 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93 A122

04 16 14 08 2025  46.6 -119.8 2.3 DESERT AIRE WASHINGTON         M104 T82 R53 Z113 B93 A122

04 16 14 04 2025  48.7 -119.5 2.5 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93 A122

04 16 13 57 2025  39.2 -119.0 2.1 KM NNE OF YERINGTON            M110 T78 R58 Z108 B93 A124

04 16 13 19 2025  19.2  -64.6 3.2 BAY U.S. VIRGIN ISLANDS        M134 T113 R41 Z130 B142 A175

04 16 12 41 2025 -32.5  -14.2 5.6 SOUTHERN MID-ATLANTIC RIDGE"   M117 T124 R86 Z101 B139 A114

04 16 11 13 2025  22.3  121.4 4.1 ENE OF HENGCHUN TAIWAN         M23 T76 R101 Z79 B40 A38

04 16 11 07 2025  38.7 -119.8 2.9 W OF MARKLEEVILLE CA           M110 T77 R59 Z107 B92 A124

04 16 09 45 2025 -24.7  -68.6 4.1 DE LA SIERRA ARGENTINA         M165 T94 R83 Z93 B130 A138

04 16 07 56 2025  52.5 -174.0 3.0 ANDREANOF IS, ALASKA           M72 T72 R70 Z100 B65 A89

04 16 07 30 2025 -18.7 -172.7 5.0 E OF NEIAFU TONGA              M98 T1 R134 Z32 B36 A64

04 16 05 52 2025  19.6 -103.4 4.4 E OF ZAPOTILTIC MEXICO         M134 T79 R63 Z104 B106 A139

04 16 05 22 2025   5.6  126.6 4.7 SSE OF PONDAGUITAN PHILIPPINES M33 T63 R119 Z62 B27 A22

04 16 04 47 2025  31.7 -104.3 2.2 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105 A137

04 16 04 31 2025 -19.4 -177.6 4.2 FIJI REGION"                   M93 T3 R137 Z30 B32 A60

04 16 04 15 2025  34.7  -85.3 2.2 WNW OF LINWOOD GEORGIA         M123 T100 R41 Z126 B120 A151

04 16 03 49 2025  51.2 -178.4 5.2 SW OF ADAK ALASKA              M70 T71 R72 Z98 B62 A86

04 16 02 44 2025  38.5   -8.0 2.9 SW OF ÉVORA PORTUGAL          M86 T158 R21 Z170 B142 A128

04 16 02 25 2025 -48.0   99.8 5.2 SOUTHEAST INDIAN RIDGE"        M69 T72 R149 Z43 B60 A35

04 16 01 42 2025 -47.8   99.8 6.6 SOUTHEAST INDIAN RIDGE"        M69 T72 R149 Z43 B60 A35

04 16 01 39 2025  56.5 -148.9 3.3 ESE OF CHINIAK ALASKA          M84 T79 R59 Z109 B78 A104

04 16 01 26 2025  37.6   16.1 4.7 PALIZZI MARINA ITALY           M69 T160 R36 Z156 B128 A109

04 16 00 58 2025  31.9 -102.0 2.5 SSE OF MIDLAND TEXAS           M123 T86 R53 Z113 B106 A139

04 16 00 29 2025   2.2  -96.5 4.5 THE GALAPAGOS ISLANDS          M153 T78 R72 Z96 B111 A142

04 16 00 07 2025  31.7 -104.3 2.5 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105 A137

04 16 00 01 2025  52.2 -171.7 3.5 E OF ATKA ALASKA               M74 T72 R70 Z100 B65 A90

April 16, 2025

 

A strong geomagnetic storm hit the earth late on UT April 15, 2025. The sudden

commencement of this storm was well documented by the magnetometer on GOES

satellites as beginning at 17:05 UT as a strong increast in geomagnetic field

strength. Other sudden changes in field strength subsequently occurred at 21:20 UT;

22:20 UT; 23:50 UT and 00:00 - 00:10 UT on April 16. Kp jumped to over 6 during

this period and there was a sudden and strong global earthquake series which also

was limited to this period. This swarm began with M 4.9 in the South Sandwich Islands

at 20:39 UT followed by a moderately strong quake in Mindanao, Philippines at

21:42 UT of M 5.6. An M 4.2 in Mangan India coincided with the geomagnetic

field spike at 22:20 UT with an M 4.7 in the Mid-Indian Ridge at 22:40 UT; an M 5.6

in Afghanistan at 23:13 UT and an M 5.0 in the Scotia Sea at 23:06 UT. The final

significant geomagnetic field spike was accompanied by an M 4.5 in the Galapagos Islands

and the strongest earthquake of the day - of M 6.6 - in the Southeast Indian Ridge.

All of these events appear to be related to the strong and sudden geomagnetic

storm. The strong earthquake series ceased as the storm wound down after 02:00 UT

on April 16.

 

The strongest earthquake of the day was an M 6.6 in the southeast Indian Ridge southwest of Australia.

It was not reported felt in this remote area and like most strong earthquakes

on Ocean Ridges was not expected to produce a notable tsunami and no tsunami

waves were reported. It was followed by an M 5.2 aftershock 43 minutes later.

This event is the strongest earthquake within about 300 km of this epicenter

on the Southeast Indian Ridge since an M 6.6 on June 13, 2002, the only such

event in this region in the past 35 years. At the time this summary noted:

 

 

"A strong earthquake occurred in the southeast Indian Ridge this

morning. This event has initial Ms 6.5 (NEIS). This is one of the

largest events ever recorded in this section of the SE Indian

Ridge" (June 13, 2002)

 

The epicenter in the Indian Ridge - at 99E longitude - was at local solar midnight

when the geomagnetic storm began at 17:10 UT and was likely promoted by geomagnetic effects.

 

Forecast 171608 had expected this area of the Indian Ocean region was likely

to see enhanced seismicity around April 19.

 

O: 16APR2025 01:42:59 47.8S  99.8E ML=6.6  EMSC   Southeast Indian Ridge

P: 19APR2025 171608   46.0S  96.0E 4.0-5.5 BBBAA  South Indian Ocean            

 

An earthquake of M 5.6 was widely felt in the area of Afghanistan and Pakistan

shortly after the sudden commencement geomagnetic storm. NEIC reported it was

felt with intensity V in Pakistan in the North-west Frontier at Baffa, Kohat and Mardan and in Punjab at Dera Ghazi Khan, Sanjwal and with IV in Abottabad, Bat Khela, Cherat, Mingaora, Nowshera, Peshawar, and in Punjab at Lahore, Rawalpindi, Taxila, Wah, also in Tajikistan at Dushanbe and Qurgonteppa ad in Raipur, Uttatanchal. Lesser shaking was noted in Uzbekistan, Afghanistan, Jammu and Kashmir, India, and Tajikistan among others.

 

Also during the intial geomagnetic storm today an M 5.0 occurred in the

Scotia Sea south of South America. It was not reported felt in this remote

area but is an unsual event. An earthquake of M 5.3 hit this area on January 8, 2025.

and prior to that an M 5.5 on February 7, 2020.  At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 5.5 in the Drake Passage south of South America.

This is the strongest earthquake in this remote area within about 400 km of this

epicenter since an M 5.6 on August 27, 2018 and prior to that an M 6.6 and 5.6 on January 15 and 17, 2012.

This may have been promoted by the current geomagnetic storm which, as noted, in

the previous issue of this summary could have enhanced seismicity in the region

of high latitudes" (February 7, 2020)

 

Near the beginning of the geomagnetic storm an M 5.6 occurred south of Mindanao,

Philippines. NEIC reported it was felt with intensity IV in Buayan, III in Alabel and II in Katnagawan, Southern Mindanao, Philippines.

 

The strongest earthquake in the U.S. or Canada today was an M 5.2 in the Andreanof Islands, Canada. NEIC expected intensity up to II in the epicentral area but this was not confirmed.

This epicenter is at the fifth node (72 degrees) from recent strong to major

earthquakes in Myanmar, Tonga and the Reykjanes Ridge, Atlantic and was likely

promoted by strong constructive interference of energy from these three epicenters.

This epicenter was at the peak of the geomagnetic storm at local solar noon

and was also probably promoted by energy from that storm.

 

An unusual earthquake also occurred today in the Ionian Sea south of Italy and east

of Sicily. NEIC reported it was felt with maximum intensity V in Sicily at Ramacca with IV in Avola, Trecastagni and Sant'Agata Li Battiati; in Mellieha and Santa Venera and Tarxien, Malta and in Campania, Italy at Eboil, Reggio de Calabria, Palizzi, and Motta San Giovanni. Lesser shaking was reported in Sicily, Southern Italy and Malta within about 300 km of the epicenter.

The last earthquake within about 150 km of today's epicenter with M>=4/7 was an

M 5.0 on December 26, 2018. At the time this summary noted:

 

 

"The major eruption of Mt. Etna in Sicily continued today. The largest associated earthquake

was an M 5.1 felt with intensity up to VII in Viagrande and VI in Catania Sicilien. Lesser shaking was felt throughout the area of Sicily especially at Aci Bonaccorsi and San Gregorio with intensity IV. Other areas

reporting moderate shaking of II-III included Aci Catena, Gravina di Catania, Tremestieri Etna, and Belpasso, Sicily.

Ligher earthquakes were also felt in Sicily today. This reported summarized this

activity in the previous issue as:

 

 

"A strong eruption of Mt. Etna in Sicily, Italy occurred today following a

series of moderate earthquakes in the area. No tsunami was reported or expected

but volcanic eruptions can cause local tsunamis. The eruption included lava

flows and steam and ash thrown high in the air. Strong eruptions at Etna

have occasionally be followed by unusual seismicity in Central California

in the next week. There were no reports or damage or casualties from today's

eruption or earthquakes. Etna is an active volcano but today's eruption was

especially vigorous. The strongest of the associated earthquakes was an M 4.3.

Earthquakes in this region are common but usually smaller than M 4.0. The last

event of M>=4.3 within about 150 km of this epicenter was an M 4.6 on October 6, 2018, the only

significantly larger event in the area since an M 4.6 on February 8, 2016.

NEIC reported today's earthquake of M 4.3 in Sicily,, Italy was felt with intensity II-III in the area(s) of Piedimonte Etnas, Ao Calera, and Catania, Italy.

Forecast 122048 had expected a moderate swarm in the region of Sicily was

likely around December 22. This epicenter is located at 102-103 degrees from the M 7.1

in the South Sandwich Islands of December 11 and was probably promoted by concentrated energy from that event.

After major earthquakes energy is reflected and refracted off the core-mantle boundary and

and reaches the surface in this distance range, often with a subsequent increase

in zonal seismicity at about 103 degrees." (December 25, 2018)

 

 

The last earthquake at a shallow focus in the region of Sicily occurred as an M 5.3

on October 25, 2012 and prior to that as an M 6.0 east of Sicily on September 6, 2002." (December 26, 2018)

 

NEIC 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 Tlalnepantla, and Coacalco, Mexico.

 

NEIC reported an earthquake of M 2.9 in Portugal was felt with  intensity up to III in the area(s) of Portugal in Alentejo at Montemor-o-Novo and Evora.

EMSC reported moderate shaking in Portugal at Evora, Canaviais, Arraiolos, Escoural, Redondo, Pedrogao with loud rumbling sound.

 

NEIC reported an earthquake of M 2.5 in Western Texas was felt with  intensity up to II-III in the area(s) of Western Texas at Midland.

 

 

NEIC reported an earthquake of M 4.2 in Nepal was felt with  intensity up to II-III in the area(s) of Nepal at Mechinagar, Jhapa.

 

NEIC reported an earthquake of M 4.5 in Antofagasta, Chile was felt with  intensity up to II-III in the area(s) of Antofagasta, Chile at Calama.

 

GeoNet reported this earthquake in North Island, New Zealand with the following parameters:

 

O: 15APR2025 19:20:15 38.9S 178.1E MS=4.4  GEONET 460 people reported feeling this earthquake with 215 at weak intensity and 224 with light shaking and 20 with moderate intensity 0 with strong, 0 with severe and 1 with extreme intensity.

 

 

TROPICAL CYCLONE ERROL (29S)                  

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    ERROL    2025-04-16  00:00 UT  14.7S  118.8E  150 kts  North of Australia 

 

Tropical Cyclone Errol (29S) continued today in the area north of Australia and south of the Banda Sea, Indonesia with winds up to 150 kts.   The antipode of this epicenter is at 14N 61W.  The antipode of this epicenter will encounter the Leeward and Windward Islands  of the eastern Caribbean. Energy from this storm could enhance seismicity in that region around April 16-18, 2025 near (13N 60W).

 

 

TROPICAL CYCLONE TAM (30S)                 

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    TAM      2025-04-16  00:00 UT  23.1S  171.7E  065 kts  Loyalty Islands 

 

Tropical Cyclone Tam (30S) continued today in the area of the Loyalty Islands with winds up to 065 kts.  It is likely to help promote seismicity in the region of southern Vanuatu and Loyalty Islands in the next several days. The antipode of this epicenter is at 23N  9W an aseismic region of north Africa. No seismic enchancement is expected in this region.

 

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

6970       0135   0141      0146   C3.0      (April 15, 2025)   2.3E-03  

Vanuatu M 4.801:36 UT

Guatemala M 4.2 01:38 UT

Iceland M 4.5 01:43 UT

 

6990       0919   0934      0942   C4.4      (April 15, 2025)   5.6E-03  

Kuril Is. M 4.4 09:42 UT

 

7000       1004   1020      1028   M1.5      (April 15, 2025)   1.2E-02      

Antofagasta M 4.5 10:29 UT

 

 

7020       1342   1347      1352   C3.2      (April 15, 2025)   2.1E-03      

7040       1757   1813      1827   M1.3      (April 15, 2025)   1.9E-02      

7050       2008   2020      2049   C3.1      (April 15, 2025)   7.2E-03  

South Sandwich Is. M 4.9 20:39 UT

 

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  active April 18 minor storms 17 severe storms April 16.  Solar M-flare chance: 80% X-class: 15% proton storm: 10%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    34 19 13 23:00 6   58 153

 

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS).

Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04 16 17 44 2025 -33.9 -179.4 5.4 THE KERMADEC ISLANDS           M97 T14 R150 Z16 B38

04 16 17 35 2025 -33.8 -179.5 5.3 THE KERMADEC ISLANDS           M97 T14 R149 Z16 B38

04 16 17 03 2025  40.4 -125.0 3.5 WNW OF PETROLIA CA             M107 T75 R60 Z106 B88

04 16 15 44 2025  40.4 -125.1 3.0 WNW OF PETROLIA CA             M107 T75 R60 Z106 B88

04 16 15 37 2025  53.9 -168.0 4.1 DUTCH HARBOR ALASKA            M76 T74 R67 Z102 B68

04 16 15 04 2025  40.4 -125.0 3.8 WNW OF PETROLIA CA             M107 T75 R60 Z106 B88

04 16 14 23 2025  48.8 -119.5 3.0 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93

04 16 14 08 2025  46.6 -119.8 2.3 DESERT AIRE WASHINGTON         M104 T82 R53 Z113 B93

04 16 13 57 2025  39.2 -119.0 2.1 KM NNE OF YERINGTON            M110 T78 R58 Z108 B93

04 16 13 19 2025  19.2  -64.6 3.2 BAY U.S. VIRGIN ISLANDS        M134 T113 R41 Z130 B142

04 16 12 41 2025 -32.5  -14.2 5.6 SOUTHERN MID-ATLANTIC RIDGE"   M117 T124 R86 Z101 B139

04 16 11 13 2025  22.3  121.4 4.1 ENE OF HENGCHUN TAIWAN         M23 T76 R101 Z79 B40

04 16 11 07 2025  38.7 -119.8 2.9 W OF MARKLEEVILLE CA           M110 T77 R59 Z107 B92

04 16 09 45 2025 -24.7  -68.6 4.1 DE LA SIERRA ARGENTINA         M165 T94 R83 Z93 B130

04 16 07 30 2025 -18.7 -172.7 5.0 E OF NEIAFU TONGA              M98 T1 R134 Z32 B36

04 16 05 52 2025  19.6 -103.4 4.4 E OF ZAPOTILTIC MEXICO         M134 T79 R63 Z104 B106

04 16 05 22 2025   5.6  126.6 4.7 SSE OF PONDAGUITAN PHILIPPINES M33 T63 R119 Z62 B27

04 16 04 47 2025  31.7 -104.3 2.2 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

04 16 04 31 2025 -19.4 -177.6 4.2 FIJI REGION"                   M93 T3 R137 Z30 B32

04 16 04 15 2025  34.7  -85.3 2.2 WNW OF LINWOOD GEORGIA         M123 T100 R41 Z126 B120

04 16 03 49 2025  51.2 -178.4 5.2 SW OF ADAK ALASKA              M70 T71 R72 Z98 B62

04 16 02 44 2025  38.5   -8.0 2.9 SW OF ÉVORA PORTUGAL          M86 T158 R21 Z170 B142

04 16 02 25 2025 -48.0   99.8 5.2 SOUTHEAST INDIAN RIDGE"        M69 T72 R149 Z43 B60

04 16 01 42 2025 -47.8   99.8 6.6 SOUTHEAST INDIAN RIDGE"        M69 T72 R149 Z43 B60

04 16 01 39 2025  56.5 -148.9 3.3 ESE OF CHINIAK ALASKA          M84 T79 R59 Z109 B78

04 16 01 26 2025  37.6   16.1 4.7 PALIZZI MARINA ITALY           M69 T160 R36 Z156 B128

04 16 00 58 2025  31.9 -102.0 2.5 SSE OF MIDLAND TEXAS           M123 T86 R53 Z113 B106

04 16 00 29 2025   2.2  -96.5 4.5 THE GALAPAGOS ISLANDS          M153 T78 R72 Z96 B111

04 16 00 07 2025  31.7 -104.3 2.5 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

04 15 23 55 2025  46.6 -119.8 2.4 DESERT AIRE WASHINGTON         M104 T82 R53 Z113 B93

04 15 23 13 2025  35.9   70.6 5.6 NNW OF PāRÅ«N AFGHANISTAN     M26 T121 R69 Z118 B86

04 15 23 06 2025 -59.9  -58.4 5.0 SCOTIA SEA"                    M138 T84 R114 Z67 B110

04 15 22 40 2025  -7.5   67.8 4.7 MID-INDIAN RIDGE"              M40 T113 R101 Z90 B83

04 15 22 29 2025  19.2  -64.5 3.4 BAY U.S. VIRGIN ISLANDS        M134 T114 R41 Z130 B142

04 15 22 20 2025  28.3   88.1 4.2 NNW OF MANGAN INDIA            M9 T106 R84 Z102 B70

04 15 21 42 2025   5.8  124.2 5.6 SSW OF MAGULING PHILIPPINES    M31 T66 R118 Z64 B29

04 15 21 24 2025  49.4 -120.5 2.1 S OF PRINCETON CANADA          M101 T83 R52 Z114 B93

04 15 20 39 2025 -60.6  -26.5 4.9 SOUTH SANDWICH ISLANDS REGION" M124 T95 R113 Z72 B113

04 15 19 52 2025  35.3 -118.5 2.5 NNW OF TEHACHAPI CA            M114 T76 R60 Z106 B93

04 15 19 42 2025  35.3 -118.5 2.6 NNW OF TEHACHAPI CA            M114 T76 R60 Z106 B93

04 15 19 41 2025  -7.0  130.0 4.3 BANDA SEA"                     M44 T55 R132 Z50 B21

04 15 18 52 2025  -6.6  128.4 4.2 LOSPALOS TIMOR LESTE           M42 T57 R131 Z51 B23

04 15 16 46 2025  32.4 -115.2 2.3 DELTA B.C. MX                  M118 T76 R60 Z105 B95

04 15 16 23 2025  40.6 -122.1 2.0 E OF MILLVILLE CA              M108 T77 R59 Z107 B90

04 15 15 49 2025  -6.5  155.0 5.2 PANGUNA PAPUA NEW GUINEA       M64 T33 R133 Z41 B3

04 15 15 07 2025  37.6   71.9 4.2 ENE OF KHORUGH TAJIKISTAN      M25 T121 R68 Z118 B85

04 15 14 51 2025  31.7 -104.3 2.0 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

04 15 14 42 2025  31.7 -104.3 2.0 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

04 15 12 09 2025  35.3 -117.8 2.5 WSW OF JOHANNESBURG CA         M114 T76 R60 Z106 B93

04 15 11 29 2025  39.2 -123.1 2.3 ENE OF TALMAGE CA              M109 T75 R60 Z106 B90

04 15 11 22 2025 -16.8  -23.4 5.1 SOUTH ATLANTIC OCEAN"          M122 T133 R69 Z116 B156

04 15 11 07 2025  53.7 -164.6 3.4 ESE OF AKUTAN ALASKA           M77 T74 R66 Z103 B69

04 15 10 46 2025  18.9  -64.8 3.3 AMALIE U.S. VIRGIN ISLANDS     M135 T113 R42 Z130 B142

04 15 10 29 2025 -22.4  -68.9 4.5 NE OF CALAMA CHILE             M165 T95 R81 Z95 B131

04 15 09 42 2025  43.5  147.7 4.4 ESE OF SHIKOTAN RUSSIA         M47 T72 R84 Z91 B49

04 15 06 47 2025 -21.1  -68.9 4.0 W OF OLLAGüE CHILE            M165 T95 R80 Z96 B131

04 15 05 36 2025  32.1 -101.1 2.6 SSW OF WESTBROOK TEXAS         M123 T86 R52 Z114 B107

04 15 05 30 2025  36.8  -90.6 2.4 SSW OF WILLIAMSVILLE MISSOURI  M121 T96 R43 Z124 B115

04 15 04 05 2025  40.3 -124.3 2.2 W OF PETROLIA CA               M107 T75 R60 Z106 B89

04 15 03 43 2025  33.1 -116.6 2.1 WSW OF JULIAN CA               M117 T76 R61 Z105 B94

04 15 02 49 2025  52.0 -169.2 3.0 FOX ISLANDS, ALASKA            M75 T72 R69 Z100 B66

04 15 02 46 2025  54.4 -158.7 3.3 SOUTHERN ALASKA                M80 T75 R64 Z105 B72

04 15 02 26 2025  52.0 -169.3 3.9 FOX ISLANDS, ALASKA            M75 T72 R69 Z100 B66

04 15 02 13 2025  39.1 -119.0 2.2 KM NE OF YERINGTON             M111 T78 R58 Z108 B93

04 15 01 55 2025  48.8 -119.5 2.8 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93

04 15 01 43 2025  64.6  -17.6 4.5 WNW OF HöFN ICELAND           M79 T132 R14 Z161 B121

04 15 01 36 2025 -18.2  168.1 4.8 SSW OF PORT-VILA VANUATU       M81 T17 R142 Z28 B20

04 15 01 27 2025  31.7 -104.4 2.6 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04 15 01 08 2025  40.3 -125.0 2.4 W OF PETROLIA CA               M107 T75 R60 Z106 B88

 

 

April 15, 2025

 

A moderate earthquake of M 5.2 shook much of southern California today. Readers

of this summary had been given a week's notice of the possibility of this

earthquake at this time in California or Nevada. Analysis of seismicity

following strong earthquakes in the Reykjanes Ridge of the North Atlantic

was published in this summary from April 4-7, 2025. This analysis is

reproduced below:

 

"There is some danger for the Pacific Plate-North American plate seismicity

following this earthqake in the Reykjanes Ridge. Following is a listing

in the Reykjanes area of M>=6.5 over the past century. The second reading

is for an earthquake in the California/Nevada area in the days following

the Reykjanes Ridge event.

 

12 11 12 57  7 1954  52.500  -32.000   0 6.5   0

12 16 11  7 11 1954  39.280 -118.120   0 7.3   0 Dixie Valley, Nevada

 

12 25  9 33 36 1956  48.750  -27.750   0 6.5   0

12 31 17 39 24 1956  38.283 -118.967  10 5.5   0 California-Nevada border

 

 2 13 23 14 24 1967  52.761  -34.098  33 6.8 159

 2 16 15  5 54 1967  37.422 -114.184  33 4.8  32 Caliente, Nevada

 2 16 19 41 27 1967  32.150 -116.016   5 4.6  16 Southern California

 2 17  8 12 56 1967  31.600 -116.240  10 4.6  12 Southern California

 2 18 18 48 56 1967  34.183 -117.266   1 4.7  26 Eastern Los Angeles

 

10 16  5 45 11 1974  52.710  -32.000  41 7.3 355

11  3  8 26 10 1974  31.000 -115.200  33 4.7   0 Baja California

 

02 16 23 53 19 1998  52.718  -33.677  10 6.8  10

02 18 14 29 34 1998  31.915 -115.746   3 4.6  10 Baja California

 

02 13 18 59 12 2015  52.635  -31.884  16 7.1  10

02 14 02 28 56 2015  37.142 -117.262  17 4.8  10 Ridgecrest, California

 

As can be seen an earthquake of M>=4.5 have occurred in California or Nevada

in four of six occurrences of such an event in the Reykjanes Ridge with

several within 2-3 days (mostly at the sixth node (60 degrees) or the seventh node (52 degrees)

from the mainshocks in the Reykjanes area. These largest of these was the M 7.3 in December, 1954

in the Dixie Valley of Nevada which occurred 4-5 days after the North Atlantic

quake. The reason for this corresponding California activity may have to do

with the location of the North Atlantic events which lie near the Euler Pole

for North America and the Pacific Plates. This is the point around which the

North American plate appears to rotate with respect to the Pacific Plate.

A line perpendicular to local faults in California extended on a globe

will intersect other such lines at the Euler Pole. So energy emitted

at the Euler Pole will interact with faults in California as a pulse rather

than piece-meal. This simultaneity causes larger and more wide-spread

fault slippage especially in basin and range tectoniss as occur in

Nevada. With this in mind this summary is issuing a seismic watch for

the Pacific Plate-North American Plate and especially for vertical or strike-slip tectonics

regions for the next week extending from the Gulf of California to Washington

State with a moderate possibility of a moderate to strong quake in this time

period. A likely time for such event would be within a couple of days of the next full moon on April 13." (April 4, 6, 7, 2025)

 

Since this seismic watch was last published on April 7, 2025, today's event

of M 5.2 in southern California falls within the watch period at the expected

time of maximum danger for such and event as stated in the last line:

 

"A likely time for such event would be within a couple of days of the next full moon on April 13." (April 4, 6, 7, 2025)

 

When an M 5.5-5.9 hit the area of Papua New Guinea on April 10, 2025, this

summary elaborated on the possible impact on seismicity in Southern California

at this time and noted: 

 

"The Los Angeles area of Southern California is located at 103 degrees from

this epicenter in New Guinea. Several light earthquake occurred in that area

today. Seismic energy is concentrated at this distance following major earthquakes

due to refraction and reflection off the core-mantle boundary to this

distance zone. Seismicity is often seen to increase at this distance following

major earthquakes. For example, the two great earthquake in this area of

Papua New Guinea in the past 50 years occurred on January 10, 1971 (M 8.1)

and on September 12, 1979 (M 8.0). These were followed by earthquakes in

San Fernando, Southern California on February 9, 1971 (M 6.7) and October 15, 1979

in Baja California (M 7.0) respectively. Both occurred about a month after

the major Papua earthquake and were both highly damaging." (May 6, 2013)

 

This Papua earthquake was followed by an upsurge in seismicity at 103-104 degrees from the epicenter

in Southern California which has included several events of M>=3. This is

expected to continue, however the moderate size of the PNG event is unlikely

to trigger moderate or strong events in southen California at this time." (April 11, 2025)

 

As expected this epicenter of M 5.2 in Southern California is at 104 degrees from New Guinea

and at the sixth node (60 degrees) from the Reykjanes Ridge event of M 6.9. Energy from these

sources probably helped trigger today's earthquake.

 

 

NEIC reported a foreshock  of M 3.3-3.5 in Southern California was felt with  intensity up to II-III in the area(s) of Southern California with IV at Del Mar; III in Alpine, La Mesa, Spring Valley, El Cajon, Julian, Lakeside, Poway, Ramona, Santee, Valley Center, San Diego and II in Los Angeles, Walnut, Jamul, La Mesa, Lemon Grove, Spring Valley, El Cajon, Escondido, Fallbrook, Pauma Valley, San Marcos, Santa Ysabel, Vista, Warner Springs, Ludlow and Murrieta.

This foreshock occurred near local solar noon on April 13, 2025 and was probably

showing the strong stresses had reached a breaking point.

 

This area of Southern California had seen increased seismicity in recent days as noted above. Foreshocks

within about 30 km of today's epicenter occurred on April 11 at 11:06 UT with M 2.2

and as a series of light events on April 10 within about 15 degrees of today's

epicenter near local solar noon with the largest of these at solar noon (19:39 UT on April 10).

These indicated elevated stresses which were being triggered by high tidal

stresses at local solar noon. More recently an M 1.7 occurred on April 12, 2025.

 

More than 40,000 residents of southern California reported to NEIC that they

had felt this earthquake. NEIC reported minor damage and intensity VI in California

at Ranchita, Santa Ysabel, with V at Alpine, Descanso, Pine Valley, Spring Valley, Borrego Springs, El Cajon, Escondido, Julian Lakeside, Pauma Valley, Ramona, Bonita, Chula Vista, IV in La Mesa, Carlsbad, and in general within about 150 km of the epicenter.

The largest immediate aftershock was an M 4.0. NEIC reported it was felt with intensity V in California at Rancho Santa Margarita; IV in Los Angeles, Seal Beach, Alpine, Chula Vista, Bonsall, El Cajon, Julian, La Jolla, Lakeside, Ramona, Warner Springs, San Diego, Pa;m Desert, Riverside, Hemet, Irvine Laguna Hills, Garden Grove, Los Angeles with lesser intensity within about 200 km of the epicenter.

 

The last earthquake within about 150 km of today's epicenter in Southern California

with M>=5.2 occurred on June 5, 2021 about 100 km to the east of today's

epicenter. The last of significantly larger magnitude in the area was an M 5.8 on June 15, 2010.

Other events in the region of M>5.2 in the past 35 years included an M 6.2 on April 23, 1992;

M 5.5 on August 26, 2012. Events of M5.2-5.3 hit the area on June 10, 2016; July 7, 2010;

June 12, 2005; October 31 2001 and June 29, 1992. At the time of the June, 2021

event this summary noted in part:

 

 

"Earthquakes in this area often occur in several day swarms and several

mainshocks often occur, so a second mainshock of M>=5 is possible in this

swarm. The last earthquake within about 150 km of today's epicenter with

M>=5.3 was an M 5.5 on August 26, 2012. An M 7.2 hit abotu 150 km southeast

of this epiceter on Easter Sunday April 4, 2010. Today's event, the

strongest in the regionin nearly nine years is a significant regional

earthquake." (June 5, 2021)

 

Forecasts 171465 and 171464 had bracketed this event within about 100 km

was likely around April 12-16. Other forecasts also identified strongly

enhanced seismicity in this area at this time.

 

 

O: 14APR2025 17:08:27 33.0N 116.6W ML=5.2  EMSC   Southern California

P: 16APR2025 171465   32.9N 115.6W 2.5-4.6 AAAAA  So. California                

P: 12APR2025 171464   32.9N 117.6W 2.5-4.6 AAAAA  So. California                

 

The full moon arrived on April 13, 2025 at 00:22 UT. Longitudes which were at local solar midnight at this time are located at about 5 West while those at local solar noon are near 175 East. In the east these include most of western Europe and Iceland  and the Atlantic Ridges while in the west areas of the western Aleutians, Kamchatka,  Tonga/Fiji/Samoa and portions of New Zealand  and Vanuatu 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 considered moderate to high in the next week (April 11-19, 2025).

 

 

An earthquake of M 4.8 occurred today in southern Vanuatu. It was not reported felt in this remote area.

It was likely triggered by the passage of Tropical Cyclone 30S over this epicenter

earlier in the day as noted in the previous issue of this summary:

 

"TC    30S      2025-04-14  00:00 UT  18.5S  169.0E  055 kts  Southern Vanuatu

 

Tropical 30S continued today in the area of Southern and Central Vanuatu with winds up to 055 kts.  It is likely to help promote seismicity in the region of southern Vanuatu and Loyalty Islands in the next several days. The antipode of this epicenter is at 19N 10W an aseismic region of north Africa. No seismic enchancement is expected in this region." (April 14, 2025)

 

An M 4.5 was reported today in central Island but not reported felt through NEIC.

This is not part of the volcanic eruption in southwestern Iceland which is still

proceeding to produce lava and tremors. But it may represent a further volcanic

zone to watch for enhanced seismicity. It occurred within minutes of local

solar midnight and may have been promoted by strong tidal stresses with

the full moon of April 13 which maximized near this longitude and time.

 

 

NEIC reported an earthquake of M 2.7 in Northeastern Washington State was felt with  intensity up to II-III in the area(s) of Northeastern Washington State with III in Tonasket and II in Loomis, Oroville and in Osoyoos, British Columbia, Canada.

 

NEIC reported an earthquake of M 4.2 in Northern Chile was felt with  intensity up to II-III in the area(s) of Northern Chile in Iquique, Tarapaca.

 

NEIC reported an earthquake of M 2.5 off northern California  was felt with  intensity up to II-III in the area(s) of northern California in Myers Flat (III) and Rio Dell (II).

 

 

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 II at La Canada Flintridge, Tujunga, Northridge, Van Nuys.

 

EMSC reported an earthquake of M 2.8 in Spain was felt with  intensity up to IV in the area(s) of Spain with a loud banging sound and sharp but short intensity in Torrevieja, Orihuela, Guardamar del Segura, Los Montesinos.

Many were wakened by the tremor in this tourist destination. It occurred within

minutes of local solar midnight and may have been promoted by tidal stresses

with the full moon of April 13 which maximize near this hour. A number of smaller

foreshocks and aftershocks were recorded by barely felt.

 

EMSC reported an earthquake of M 3.5 in Malay Peninsula, Thailand was felt with  intensity up to IV in the area(s) of Malay Peninsula, Thailand at Pak Nam, Krabi Yai and Ao Nang, Krabi.

This is an unusual earthquake despite its light magnitude. The last earthquake

of M>=3.5 within about 150 km of this epicenter was an M 4.3 and M 3.9 on May 5 and 6, 2015. 

 

At the time this summary noted:

 

"The most unusual earthquake of the day was widely felt in Thailand near Phuket.

While small and without reported damages or casualties, this event was widely

reported felt. The last earthquake of M>=4.3 in this region of Tailand near

Phlu Nai occurred as an M 4.5 on September 6, 2005, the only such event within

200 km of this epicenter of this size in the past 25 years. Forecast 88601 expected

regional activity southwest of this was likely in late April or early May.

 

EMSC reported this earthquake of M 4.3 in the Malay Peninsula, Thailand was felt with intensity II-III in the epicentral area.

NEIC reported intensity II-III in Thailand at Krabi, Phuket and Kathu." (May 6, 2015)

 

It occurred near local solar noon and may have been promoted by tidal stresses

associated with the full moon of April 13.

 

TROPICAL CYCLONE ERROL (29S)                 

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    ERROL    2025-04-15  00:00 UT  13.5S  120.3E  075 kts  North of Australia 

 

Tropical Cyclone Errol (29S) continued today in the area north of Australia and south of the Banda Sea, Indonesia with winds up to 065 kts.  It is likely to help promote seismicity in the Banda Sea in the next several days. The antipode of this epicenter is at 12N 58W.  The antipode of this epicenter will encounter the Leeward and Windward Islands and northern Venezuela of the eastern Caribbean. Energy from this storm could enhance seismicity in that region around April 14-16, 2025 near (13N 60W).

 

 

TROPICAL CYCLONE TAM (30S)                 

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    TAM      2025-04-15  00:00 UT  23.1S  171.7E  065 kts  Loyalty Islands 

 

Tropical Cyclone Tam (30S) continued today in the area of the Loyalty Islands with winds up to 065 kts.  It is likely to help promote seismicity in the region of southern Vanuatu and Loyalty Islands in the next several days. The antipode of this epicenter is at 23N  9W an aseismic region of north Africa. No seismic enchancement is expected in this region.

 

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

6790       0014   0020      0030   C6.4      (April 14, 2025)   1.2E-03  

6820       0438   0449      0456   C5.0      (April 14, 2025)   5.0E-03  

Myanmar M 4.1 04:37 UT

 

6840       0600   0605      0611   M1.4      (April 14, 2025)   8.8E-03  

Taiwan M 4.4 05:58 UT

 

6850       0636   0650      0658   M4.2      (April 14, 2025)   1.7E-03  

6860       0741   0748      0753   C3.9      (April 14, 2025)   2.8E-03      

Souothern Californai M 2.7 07:45 UT

Northern California M 2.7 07:45 UT

 

6880       1220   1232      1241   C5.5      (April 14, 2025)   1.3E-03  

6900       1443   1450      1459   C3.2      (April 14, 2025)   2.7E-03  

Sakha, Russia M 4.0 14:40 UT

 

6910       1530   1540      1544   C4.9      (April 14, 2025)   3.0E-03  

6920       1833   1842      1848   C6.2      (April 14, 2025)   4.1E-03  

6940       1944   2000      2015   C6.8      (April 14, 2025)   1.2E-03  

Myanmar M 3.8 19:46 UT

Java M 4.6 19:53 UT

Sumatra M 4.4 19:53 UT

Jalisco M 4.0 20:02 UT

 

6960       2232   2240      2245   C2.7      (April 14, 2025)   2.1E-03  

Java M 4.4 22:43 UT

 

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  active April 15 and 17 major storms April 16.  Solar M-flare chance: 80% X-class: 15% proton storm: 10%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    18 28 14 04:00 6   86 152

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS).

Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04 15 19 42 2025  35.3 -118.5 2.4 NNW OF TEHACHAPI CA            M114 T76 R60 Z106 B93

04 15 18 52 2025  -6.6  128.4 4.2 LOSPALOS TIMOR LESTE           M42 T57 R131 Z51 B23

04 15 16 46 2025  32.4 -115.2 2.4 DELTA B.C. MX                  M118 T76 R60 Z105 B95

04 15 16 23 2025  40.6 -122.1 2.0 E OF MILLVILLE CA              M108 T77 R59 Z107 B90

04 15 15 49 2025  -6.5  155.0 5.2 PANGUNA PAPUA NEW GUINEA       M64 T33 R133 Z41 B3

04 15 15 07 2025  37.6   71.9 4.2 ENE OF KHORUGH TAJIKISTAN      M25 T121 R68 Z118 B85

04 15 14 51 2025  31.7 -104.3 2.0 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

04 15 14 42 2025  31.7 -104.3 2.0 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

04 15 12 09 2025  35.3 -117.8 2.5 WSW OF JOHANNESBURG CA         M114 T76 R60 Z106 B93

04 15 11 29 2025  39.2 -123.1 2.3 ENE OF TALMAGE CA              M109 T75 R60 Z106 B90

04 15 11 22 2025 -16.8  -23.4 5.1 SOUTH ATLANTIC OCEAN"          M122 T133 R69 Z116 B156

04 15 10 46 2025  18.9  -64.8 3.3 AMALIE U.S. VIRGIN ISLANDS     M135 T113 R42 Z130 B142

04 15 10 29 2025 -22.4  -68.9 4.5 NE OF CALAMA CHILE             M165 T95 R81 Z95 B131

04 15 09 42 2025  43.5  147.7 4.4 ESE OF SHIKOTAN RUSSIA         M47 T72 R84 Z91 B49

04 15 06 47 2025 -21.1  -68.9 4.0 W OF OLLAGüE CHILE            M165 T95 R80 Z96 B131

04 15 05 36 2025  32.1 -101.1 2.6 SSW OF WESTBROOK TEXAS         M123 T86 R52 Z114 B107

04 15 04 05 2025  40.3 -124.3 2.2 W OF PETROLIA CA               M107 T75 R60 Z106 B89

04 15 03 43 2025  33.1 -116.6 2.1 WSW OF JULIAN CA               M117 T76 R61 Z105 B94

04 15 02 26 2025  52.0 -169.3 3.9 FOX ISLANDS, ALASKA            M75 T72 R69 Z100 B66

04 15 02 13 2025  39.1 -119.0 2.2 KM NE OF YERINGTON             M111 T78 R58 Z108 B93

04 15 01 55 2025  48.8 -119.5 2.7 ESE OF LOOMIS WASHINGTON       M102 T84 R52 Z114 B93

04 15 01 43 2025  64.6  -17.6 4.5 WNW OF HöFN ICELAND           M79 T132 R14 Z161 B121

04 15 01 36 2025 -18.2  168.1 4.8 SSW OF PORT-VILA VANUATU       M81 T17 R142 Z28 B20

04 15 01 27 2025  31.7 -104.4 2.6 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04 15 01 08 2025  40.3 -125.0 2.4 W OF PETROLIA CA               M107 T75 R60 Z106 B88

04 14 23 10 2025  34.3 -116.9 2.2 BIG BEAR LAKE CA               M115 T76 R60 Z106 B94

04 14 23 07 2025  29.8  139.0 4.0 IZU ISLANDS JAPAN REGION"      M39 T67 R97 Z79 B37

04 14 22 56 2025  34.3 -116.9 2.3 BIG BEAR LAKE CA               M115 T76 R60 Z106 B94

04 14 22 44 2025  -8.2  107.1 4.4 SSW OF BANJAR INDONESIA        M31 T76 R124 Z62 B44

04 14 22 17 2025  43.1  146.1 4.6 ESE OF NEMURO JAPAN            M46 T73 R84 Z91 B49

04 14 22 04 2025 -20.3  -69.1 4.2 LA TIRANA CHILE                M165 T96 R79 Z96 B132

04 14 21 05 2025  34.5 -119.0 2.3 NNW OF FILLMORE CA             M114 T75 R61 Z105 B92

04 14 20 44 2025  43.4  -71.2 2.0 ALTON NEW HAMPSHIRE            M113 T112 R27 Z140 B127

04 14 20 23 2025  33.0 -116.6 2.9 S OF JULIAN CA                 M117 T76 R61 Z105 B94

04 14 20 11 2025  67.1 -143.5 3.1 NORTHERN ALASKA                M80 T90 R49 Z119 B85

04 14 19 53 2025  -5.6  109.9 4.6 NW OF BATANG INDONESIA         M30 T75 R123 Z63 B41

04 14 19 34 2025  33.0 -116.6 2.6 S OF JULIAN CA                 M117 T76 R61 Z105 B94

04 14 19 06 2025  36.0 -120.6 2.0 NNW OF PARKFIELD CA            M112 T75 R61 Z105 B91

04 14 19 01 2025  44.5 -115.2 2.2 NNW OF STANLEY IDAHO           M107 T83 R52 Z114 B96

04 14 18 55 2025  33.1 -116.6 2.1 SSW OF JULIAN CA               M117 T76 R61 Z105 B94

04 14 18 27 2025  33.0 -116.6 2.1 SSE OF JULIAN CA               M117 T76 R61 Z105 B94

04 14 18 25 2025  33.1 -116.6 2.1 SE OF JULIAN CA                M117 T76 R61 Z105 B94

04 14 18 23 2025  33.0 -116.6 4.0 SSE OF JULIAN CA               M117 T76 R61 Z105 B94

04 14 17 25 2025  33.0 -116.6 2.1 S OF JULIAN CA                 M117 T76 R61 Z105 B94

04 14 17 14 2025  33.0 -116.6 2.6 S OF JULIAN CA                 M117 T76 R61 Z105 B94

04 14 17 13 2025  33.0 -116.6 3.0 S OF JULIAN CA                 M117 T76 R61 Z105 B94

04 14 17 12 2025  33.2 -116.3 3.5 BORREGO SPRINGS CA             M117 T76 R61 Z105 B94

04 14 17 12 2025  33.0 -116.6 2.6 S OF JULIAN CA                 M117 T76 R61 Z105 B94

04 14 17 11 2025  33.0 -116.6 2.4 SSE OF JULIAN CA               M117 T76 R61 Z105 B94

04 14 17 11 2025  33.0 -116.6 2.1 SSE OF JULIAN CA               M117 T76 R61 Z105 B94

04 14 17 10 2025  33.1 -116.6 2.8 SW OF JULIAN CA                M117 T76 R61 Z105 B94

04 14 17 10 2025  33.1 -116.6 2.8 SSW OF JULIAN CA               M117 T76 R61 Z105 B94

04 14 17 10 2025  33.1 -116.6 2.5 WSW OF JULIAN CA               M117 T76 R61 Z105 B94

04 14 17 10 2025  33.0 -116.6 2.5 SSE OF JULIAN CA               M117 T76 R61 Z105 B94

04 14 17 10 2025  33.0 -116.6 2.4 SSE OF JULIAN CA               M117 T76 R61 Z105 B94

04 14 17 10 2025  33.0 -116.6 2.3 SSE OF JULIAN CA               M117 T76 R61 Z105 B94

04 14 17 08 2025  33.0 -116.6 5.2 KM S OF JULIAN                 M117 T76 R61 Z105 B94

04 14 16 24 2025  18.6  -69.0 3.9 GUAYMATE DOMINICAN REPUBLIC    M137 T109 R44 Z127 B138

04 14 10 04 2025  52.1 -178.8 3.2 W OF ADAK ALASKA               M70 T72 R71 Z99 B63

04 14 09 18 2025 -56.0 -121.4 4.9 SOUTHERN EAST PACIFIC RISE"    M136 T52 R130 Z44 B83

04 14 09 11 2025 -27.1  -69.7 4.2 ENE OF COPIAPó CHILE          M165 T92 R85 Z90 B128

04 14 08 43 2025  49.0 -119.5 2.5 NW OF OSOYOOS CANADA           M102 T84 R51 Z115 B93

04 14 08 03 2025  40.4 -124.9 2.5 WNW OF PETROLIA CA             M107 T75 R60 Z106 B88

04 14 07 53 2025  35.3 -117.8 3.0 WSW OF JOHANNESBURG CA         M114 T76 R60 Z106 B93

04 14 07 45 2025  40.3 -126.4 2.7 W OF FERNDALE CALIFORNIA       M106 T74 R61 Z105 B87

04 14 07 07 2025  31.5 -104.1 2.1 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04 14 04 43 2025  31.7 -104.2 2.2 W OF MENTONE TEXAS             M123 T84 R54 Z112 B105

04 14 04 05 2025 -40.1  174.4 4.2 PATEA NEW ZEALAND              M95 T22 R157 Z8 B39

04 14 04 05 2025  -6.1  150.1 4.6 KIMBE PAPUA NEW GUINEA         M59 T37 R133 Z42 B1

04 14 03 06 2025  33.0 -116.6 2.0 S OF JULIAN CA                 M117 T76 R61 Z105 B94

04 14 02 54 2025  40.4 -126.1 2.7 W OF FERNDALE CALIFORNIA       M106 T74 R61 Z105 B87

04 14 02 28 2025  31.7 -104.5 2.4 WHITES CITY NEW MEXICO         M123 T84 R55 Z111 B104

04 14 02 26 2025  36.3 -120.9 2.1 NEW IDRIA CA                   M112 T75 R61 Z105 B91

04 14 01 33 2025   0.5  126.1 5.3 WSW OF TERNATE INDONESIA       M36 T62 R123 Z58 B26

04 14 01 28 2025  51.4  179.9 3.1 ANDREANOF IS. ALASKA           M69 T71 R72 Z98 B62

04 14 00 54 2025  40.6  140.4 4.4 WNW OF HIROSAKI JAPAN          M41 T73 R86 Z89 B47

04 14 00 44 2025  38.9   70.4 4.3 S OF RASHT TAJIKISTAN          M27 T122 R66 Z120 B86

04 14 00 42 2025  -7.1  129.7 4.6 KEPULAUAN BABAR INDONESIA"     M43 T56 R132 Z50 B21

04 14 00 16 2025  31.7 -104.3 2.2 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

 

 

April 14, 2025

 

A moderate earthquake of M 5.2 shook much of southern California today. Readers

of this summary had been given a week's notice of the possibility of this

earthquake at this time in California or Nevada. Analysis of seismicity

following strong earthquakes in the Reykjanes Ridge of the North Atlantic

was published in this summary from April 4-7, 2025. This analysis is

reproduced below:

 

"There is some danger for the Pacific Plate-North American plate seismicity

following this earthqake in the Reykjanes Ridge. Following is a listing

in the Reykjanes area of M>=6.5 over the past century. The second reading

is for an earthquake in the California/Nevada area in the days following

the Reykjanes Ridge event.

 

12 11 12 57  7 1954  52.500  -32.000   0 6.5   0

12 16 11  7 11 1954  39.280 -118.120   0 7.3   0 Dixie Valley, Nevada

 

12 25  9 33 36 1956  48.750  -27.750   0 6.5   0

12 31 17 39 24 1956  38.283 -118.967  10 5.5   0 California-Nevada border

 

 2 13 23 14 24 1967  52.761  -34.098  33 6.8 159

 2 16 15  5 54 1967  37.422 -114.184  33 4.8  32 Caliente, Nevada

 2 16 19 41 27 1967  32.150 -116.016   5 4.6  16 Southern California

 2 17  8 12 56 1967  31.600 -116.240  10 4.6  12 Southern California

 2 18 18 48 56 1967  34.183 -117.266   1 4.7  26 Eastern Los Angeles

 

10 16  5 45 11 1974  52.710  -32.000  41 7.3 355

11  3  8 26 10 1974  31.000 -115.200  33 4.7   0 Baja California

 

02 16 23 53 19 1998  52.718  -33.677  10 6.8  10

02 18 14 29 34 1998  31.915 -115.746   3 4.6  10 Baja California

 

02 13 18 59 12 2015  52.635  -31.884  16 7.1  10

02 14 02 28 56 2015  37.142 -117.262  17 4.8  10 Ridgecrest, California

 

As can be seen an earthquake of M>=4.5 have occurred in California or Nevada

in four of six occurrences of such an event in the Reykjanes Ridge with

several within 2-3 days (mostly at the sixth node (60 degrees) or the seventh node (52 degrees)

from the mainshocks in the Reykjanes area. These largest of these was the M 7.3 in December, 1954

in the Dixie Valley of Nevada which occurred 4-5 days after the North Atlantic

quake. The reason for this corresponding California activity may have to do

with the location of the North Atlantic events which lie near the Euler Pole

for North America and the Pacific Plates. This is the point around which the

North American plate appears to rotate with respect to the Pacific Plate.

A line perpendicular to local faults in California extended on a globe

will intersect other such lines at the Euler Pole. So energy emitted

at the Euler Pole will interact with faults in California as a pulse rather

than piece-meal. This simultaneity causes larger and more wide-spread

fault slippage especially in basin and range tectoniss as occur in

Nevada. With this in mind this summary is issuing a seismic watch for

the Pacific Plate-North American Plate and especially for vertical or strike-slip tectonics

regions for the next week extending from the Gulf of California to Washington

State with a moderate possibility of a moderate to strong quake in this time

period. A likely time for such event would be within a couple of days of the next full moon on April 13." (April 4, 6, 7, 2025)

 

Since this seismic watch was last published on April 7, 2025, today's event

of M 5.2 in southern California falls within the watch period at the expected

time of maximum danger for such and event as stated in the last line:

 

"A likely time for such event would be within a couple of days of the next full moon on April 13." (April 4, 6, 7, 2025)

 

When an M 5.5-5.9 hit the area of Papua New Guinea on April 10, 2025, this

summary elaborated on the possible impact on seismicity in Southern California

at this time and noted: 

 

"The Los Angeles area of Southern California is located at 103 degrees from

this epicenter in New Guinea. Several light earthquake occurred in that area

today. Seismic energy is concentrated at this distance following major earthquakes

due to refraction and reflection off the core-mantle boundary to this

distance zone. Seismicity is often seen to increase at this distance following

major earthquakes. For example, the two great earthquake in this area of

Papua New Guinea in the past 50 years occurred on January 10, 1971 (M 8.1)

and on September 12, 1979 (M 8.0). These were followed by earthquakes in

San Fernando, Southern California on February 9, 1971 (M 6.7) and October 15, 1979

in Baja California (M 7.0) respectively. Both occurred about a month after

the major Papua earthquake and were both highly damaging." (May 6, 2013)

 

This earthquake was followed by an upsurge in seismicity at 103-104 degrees from the epicenter

in Southern California which has included several events of M>=3. This is

expected to continue, however the moderate size of the PNG event is unlikely

to trigger moderate or strong events in southen California at this time." (April 11, 2025)

 

As expected this epicenter in Southern California is at 104 degrees from New Guinea

and at the sixth node from the Reykjanes Ridge event of M 6.9. Energy from these

sources probably helped trigger today's earthquake.

 

 

NEIC reported a foreshock  of M 3.3-3.5 in Southern California was felt with  intensity up to II-III in the area(s) of Southern California with IV at Del Mar; III in Alpine, La Mesa, Spring Valley, El Cajon, Julian, Lakeside, Poway, Ramona, Santee, Valley Center, San Diego and II in Los Angeles, Walnut, Jamul, La Mesa, Lemon Grove, Spring Valley, El Cajon, Escondido, Fallbrook, Pauma Valley, San Marcos, Santa Ysabel, Vista, Warner Springs, Ludlow and Murrieta.

This foreshock occurred near local solar noon on April 13, 2025 and was probably

showing the strong stresses had reached a breaking point.

 

This area of Southern California had seen increased seismicity in recent days as noted above. Foreshocks

within about 30 km of today's epicenter occurred on April 11 at 11:06 UT with M 2.2

and as a series of light events on April 10 within about 15 degrees of today's

epicenter near local solar noon with the largest of these at solar noon (19:39 UT on April 10).

These indicated elevated stresses which were being triggered by high tidal

stresses at local solar noon. More recently an M 1.7 occurred on April 12, 2025.

 

More than 40,000 residents of southern California reported to NEIC that they

had felt this earthquake. NEIC reported minor damage and intensity VI in California

at Ranchita, Santa Ysabel, with V at Alpine, Descanso, Pine Valley, Spring Valley, Borrego Springs, El Cajon, Escondido, Julian Lakeside, Pauma Valley, Ramona, Bonita, Chula Vista, IV in La Mesa, Carlsbad, and in general within about 150 km of the epicenter.

 

The last earthquake within about 150 km of today's epicenter in Southern California

with M>=5.2 occurred on June 5, 2021 about 100 km to the east of today's

epicenter. The last of significantly larger magnitude in the area was an M 5.8 on June 15, 2010.

Other events in the region of M>5.2 in the past 35 years included an M 6.2 on April 23, 1992;

M 5.5 on August 26, 2012. Events of M5.2-5.3 hit the area on June 10, 2016; July 7, 2010;

June 12, 2005; October 31 2001 and June 29, 1992. At the time of the June, 2021

event this summary noted in part:

 

 

"Earthquakes in this area often occur in several day swarms and several

mainshocks often occur, so a second mainshock of M>=5 is possible in this

swarm. The last earthquake within about 150 km of today's epicenter with

M>=5.3 was an M 5.5 on August 26, 2012. An M 7.2 hit abotu 150 km southeast

of this epiceter on Easter Sunday April 4, 2010. Today's event, the

strongest in the regionin nearly nine years is a significant regional

earthquake." June 5, 2021)

 

Forecasts 171465 and 171464 had bracketed this event within about 100 km

was likely around April 12-16. Other forecasts also identified strongly

enhanced seismicity in this area at this time.

 

 

O: 14APR2025 17:08:27 33.0N 116.6W ML=5.2  EMSC   Southern California

P: 16APR2025 171465   32.9N 115.6W 2.5-4.6 AAAAA  So. California                

P: 12APR2025 171464   32.9N 117.6W 2.5-4.6 AAAAA  So. California                

 

The full moon arrived on April 13, 2025 at 00:22 UT. Longitudes which were at local solar midnight at this time are located at about 5 West while those at local solar noon are near 175 East. In the east these include most of western Europe and Iceland  and the Atlantic Ridges while in the west areas of the western Aleutians, Kamchatka,  Tonga/Fiji/Samoa and portions of New Zealand  and Vanuatu 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 considered moderate to high in the next week (April 11-19, 2025).

 

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. At the time this summary noted:

 

 

"A strong earthquake of M 6.9-7.4 hit the region of the northern Kermadec

Islands today. This event was reported by GeoNet to have been felt as

far south as Wellington, N.Z. more than 1500 km to the southwest of the

epicenter. No tsunami was expected and because of the remote nature of this

epicenter no other felt effects, injuries or casualties are expected with

this earthquake. This is the largest earthquake to hit the northern Kermadec

region (26-29S 174-180W) since an M 7.0 on September 1997. The area has

been active over the past month with events of M 6.4 a month ago on Jan. 18

and an M 6.0 on Jan. 24. The area reactivated earlier this week with a further

M 6.1 and M 5.4 on Feb. 12 and an M 6.0 on Feb. 17. At the time of the M 6.1

which immediately followed the Talaud M 7.4 earthquake we emphasized the possible

relation between these events as follows and this continues to apply to the event today.  

 

"A strong earthquake of M 6.1 occurred in the Kermadec Islands of New Zealand and

was followed by an M 5.4 early on Feb. 13. This is a remote area and these

events were not expected to have been felt in the region. The maximum shaking

at long distances is expected at distances of m*360/n degrees (where n and m are small integers)

from the mainshock. These events in the Kermadec Islands occurred 60-61 degrees

from the Talaud Islands and some triggering may have been involved." (February 13, 2009, February 19, 2009)

 

This epicenter appears to be related to the full moon today as it occurred

at the longitude of maximum stress with this alignment (see above). It may

be the final strong triggered event in the series within hours of the full

moon as discussed in the previous issue of this report.

 

This epicenter is at 143 degrees from the M 6.9 in the Reykjanes Ridge of April 3 and at

the tenth node (36 degrees) from the M 6.9 in New Britain of April 4 and

may have been promoted by energy from those sources.

 

Forecast 171594 (among others) had expected this event within about 100 km

of this epicenter was likely around April 15.

 

O: 13APR2025 20:02:22 26.0S 178.3W ML=6.5  NEIC   South of the Fiji Islands

P: 15APR2025 171594   25.0S 179.0W 4.0-5.4 AAAAA  Tonga Islands                 

 

An analysis of expected seismicity following the solar eclipse of March 29, 2025

was published in this summary on March 23, 2025 as follows. With today's event

in Fiji each of the areas listed as high probability seismic areas

at this time have now occurred with a strong earthquake. That analysis follows:

 

"A similar eclipse occurred with the new moon of October 25, 2022. That eclipse

was accompanied by an M 6.4 in Luzon, Philippines and an 6.3 in the South Sandwich Islands on October 25, 2022.

The South Sandwich Islands are currently active and could see additional

seismic enhancement with the eclipse of March 29, 2025.

 

Other activity of M>=6 following the eclipse of October 25, 2022 occurred

as listed below. Much of this activity occurred near the international Date

Line in the Southwest Pacific area and included a series of three earthquakes

of M>=7 in that region about two weeks following the eclipse with the next

full moon starting on November 9, 2022. This activity (like the current

situation) is near local solar noon in Tonga and Fiji and was likely

promoted by this new moon and eclipse. Similar activity in the Tonga/Fiji/New

Zealand area could be expected in late March to early April, 2025 perhaps

with the next full moon.

 

The most unusual earthquake following the eclipse of October 25, 2022

was an M 6.0 in the North Pacific Ocean - an unprecedented event even

to this date. At the time this summary noted in this regard:

 

 

 

"The strongest earthquake in the world today was an M 6.0 in the North Pacific Ocean about 1250 km west of San Diego and Los Angeles, California. NEIC reported it was felt lightly in California throughout the coast in areas from San Francisco to Washington State to southern California.

This is an unprecedented earthquake in the middle of the North Pacific.

There is no reason to expect earthquakes such as this in this region of the Pacific

as no tectonics would support this. It is possible this was a meteor impact

in the ocean, but this cannot be confirmed. If this is a tectonic earthquake

it could indicate regional stress is high and could indicate a strong earthquake

along the coast of California could be nearer than previously thought. A strong

earthquake of M 7.5 hit  off the coast of Baja California, Mexico a week before the

M 8.3 in San Francisco, California in April 1906. This is concerning as there

was an M 5.1 in San Francisco on October 25, 2022.

 

Today's earthquake is the strongest ever recorded within about 500-1000 km of this

epicenter in the North Pacific and as such is very significant. The felt area

along the west coast of North America is also unusual." (November 2, 2022)

 

One area not noted with the eclipse of October, 2022 was the area where the maximum

eclipse is due with the current alignment - the area of the Greenland Sea and

eastern Canada. The Greenland Sea saw an M 7.1 on March 10, 2025 - the last major

earthquake in the world. A moderate aftershock or furthern volcanism is

likely in this area with the coming new moon and partial solar eclipse.

 

Table 1: List of earthquakes of M>=6 following new moon and partial solar eclipse of October 25, 2022.

 

MO DA HR MN SC YEAR  LAT N+S- LON E+W- DEP  MAG GEOGRAPHIC LOCATION

 

10 25  0 13  1 2022  -58.756  -26.192  78.0 6.3 South Sandwich Islands

10 25 14 59  3 2022   17.662  120.823  27.3 6.4 Luzon, Philippines

11  2  4 53 13 2022   31.510 -133.351  10.0 6.0 North Pacific

11  2 14 17 51 2022  -60.796  -25.733  10.0 6.1 South Sandwich Islands

11  4 10  2 46 2022   28.175 -112.303  10.0 6.1 Gulf of California

11  9  9 38 42 2022  -25.968  178.363 628.9 6.8 Fiji

11  9  9 51  4 2022  -26.044  178.381 665.3 7.0 Fiji

11  9 10 14 33 2022  -25.595  178.278 623.6 6.6 Fiji

11  9 10 14 33 2022  -25.637  178.419 622.7 6.5 Fiji

11 11 10 48 45 2022  -19.318 -172.100  24.8 7.3 Tonga

11 12  7  9 14 2022  -20.116 -178.363 587.2 7.0 Tonga

" (March 23, 2025)

 

Table 2: Corresponding earthquakes following the Solar Eclipse of March 19, 2025

 

 4  5 11 29 11 2025  -57.325  -25.615  21.6 5.5 South Sandwich Islands

 4  5 11 29 14 2025  -57.320  -25.591  51.0 5.4 South Sandwich Islands

 4  5 11 32  9 2025  -57.272  -25.572  27.7 5.6 South Sandwich Islands

 3 30 12 18 47 2025  -20.329 -173.907  29.0 7.0 Tonga

 3 30 15  4 54 2025  -20.430 -173.866  17.0 6.2 Tonga

 3 30 15 33 48 2025  -20.306 -173.715  35.0 5.8 Tonga

 4 13 20 02 22 2025  -26.000 -178.300  35.0 6.5 Fiji

 4 12  3 47  9 2025   -4.691  153.154  62.0 6.1 New Britain

 4  2  0 29 22 2025  -56.929 -142.207  10.0 6.3 South Pacific

 4  2 14  3 57 2025   31.002  131.473  26.0 6.2 Kyushu, Japan

 4  2 21  3 39 2025    2.117  126.759  36.7 5.9 Molucca Sea

 4  3 14  9 29 2025   52.460  -32.111  10.0 6.9 Reykjanes Ridge

 4  4  8  1  6 2025  -15.512 -174.542 192.0 5.7 Tonga

 4  4 20  4 38 2025   -6.205  151.764  10.0 6.9 New Britain

 4  7  2 59 30 2025   49.394  155.459  51.3 5.4 Kuril Islands

 4 13  9 13 32 2025   48.752  149.762 372.3 5.9 Kuril Islands

 4  7 19 49 20 2025    2.031   96.750  18.0 5.8 Sumatra

 4 10  2 43 28 2025   -6.264  151.417  10.0 5.4 New Ireland

 4 10  7 53 23 2025   -5.938  138.667  35.0 5.5 Papua New Guinea

 4 12  3 47  9 2025   -4.691  153.154  62.0 6.1 New Britain

 

NEIC reported an earthquake of M 4.1 in Kodiak Alaska was felt with  intensity up to II-III in the area(s) of Kodiak Alaska and Homer, AK.

 

NEIC reported an earthquake of M 3.5 in Southern California was felt with  intensity up to II-III in the area(s) of Southern California with IV at Del Mar; III in Alpine, La Mesa, Spring Valley, El Cajon, Julian, Lakeside, Poway, Ramona, Santee, Valley Center, San Diego and II in Los Angeles, Walnut, Jamul, La Mesa, Lemon Grove, Spring Valley, El Cajon, Escondido, Fallbrook, Pauma Valley, San Marcos, Santa Ysabel, Vista, Warner Springs, Ludlow and Murrieta.

 

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 Salinas.

 

NEIC 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 Guanacaste at Belen, Santa Cruz, Sardinal with III and II in Samara.

 

 

NEIC reported earthquakes of M 2.5 and M 3.2 in Eastern Washington State were felt with  intensity up to II-III in the area(s) of Eastern Washington State in Tonasket.

 

NEIC reported an earthquake of M 4.4  in Central Turkey was felt with  intensity up to II-III in the area(s) of Central Turkey at Samsun.

 

NEIC reported an earthquake of M 4.7 in Tajikistan was felt with  intensity up to II-III in the area(s) of Tajikistan in Qurgonteppa Khatlon.

 

NEIC reported an earthquake of M 3.0 in Southern Alaska was felt with  intensity up to II-III in the area(s) of Southern Alaska at Homer.

 

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 

 

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 

 

GeoNet reported an earthquake of M 4.2 in North Island, New Zealand with the following parameters today:

 

O: 14APR2025 04:05:15 40.1S 174.4E MB=4.2  GEONET Felt with moderate to strong intensity in the area of French Pass, New Zealand and in southern North Island and northern South Island. 582 reports of felt events were made of which 418 reported weak and 157 light intensity with 7 reports of moderate shaking and 0 with strong and 0 severe and 0 with extreme intensity came from the area.

 

EMSC reported an earthquake of M  in  was felt with  intensity up to IV in the area(s) of 

 

EMSC reported an earthquake of M  in  was felt with  intensity up to IV in the area(s) of 

 

EMSC reported an earthquake of M  in  was felt with  intensity up to IV in the area(s) of 

 

EMSC reported an earthquake of M  in  was felt with  intensity up to IV in the area(s) of 

 

EMSC reported an earthquake of M  in  was felt with  intensity up to IV in the area(s) of 

 

TROPICAL CYCLONE 29S                  

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    29S      2025-04-14  00:00 UT  12.2S  121.8E  065 kts  North of Australia 

 

Tropical 29S continued today in the area north of Australia and south of the Banda Sea, Indonesia with winds up to 065 kts.  It is likely to help promote seismicity in the Banda Sea in the next several days. The antipode of this epicenter is at 12N 58W.  The antipode of this epicenter will encounter the Leeward and Windward Islands and northern Venezuela of the eastern Caribbean. Energy from this storm could enhance seismicity in that region around April 14-16, 2025 near (12N 60W).

 

 

TROPICAL CYCLONE 30S                  

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    30S      2025-04-14  00:00 UT  18.5S  169.0E  055 kts  Southern Vanuatu

 

Tropical 30S continued today in the area of Southern and Central Vanuatu with winds up to 055 kts.  It is likely to help promote seismicity in the region of southern Vanuatu and Loyalty Islands in the next several days. The antipode of this epicenter is at 19N 10W an aseismic region of north Africa. No seismic enchancement is expected in this region.

 

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

6450       0121   0129      0137   M1.0      (April 13, 2025)   1.0E-02  

Eastern Washington M 3.0 01:46 UT

 

6460       0235   0241      0248   C6.5      (April 13, 2025)   2.2E-03  

Myanmar M 5.5 02:25 UT

 

6470       0327   0333      0337   C6.5      (April 13, 2025)   4.0E-03  

Eastern New Guinea M 5.5 03:48 UT

Eastern Washington M 2.1 03:30 UT

 

 

6560       0401   0405      0425   M1.1      (April 13, 2025)   2.4E-03  

South Sandwich Is. M 5.2 04:15 UT

 

6480       0425   0428      0431   M1.1      (April 13, 2025)   4.8E-03  

Tajikistan M 5.9 04:24 UT

 

6510       0448   0452      0454   M2.3      (April 13, 2025)   7.3E-03  

Eastern Washington M 2.4, 2.4 04:49 UT

 

6530       0638   0652      0721   M1.0      (April 13, 2025)   2.1E-02  

Samar Philippins M 4.2 06:38 UT

Volcano Is. M 4.5 06:44 UT

Tajikistan M 4.7 07:14 UT

 

6540       0809   0816      0836   C7.6      (April 13, 2025)   1.2E-02  

6570       0943   0955      1003   M1.4      (April 13, 2025)   1.6E-02  

6630       1003   1007      1010   M1.2      (April 13, 2025)   6.5E-03  

6620       1349   1401      1414   C8.5      (April 13, 2025)   1.1E-02  

New Britain M 5.0 16:04 UT

Siberia M 4.0 14:02 UT

 

 

6660       1458   1523      1528   C6.3      (April 13, 2025)   1.9E-03  

6670       1528   1542      1556   M1.2      (April 13, 2025)   1.8E-02  

New Britain M 4.8 16:04 UT

 

6710       1831   1835      1838   C6.8      (April 13, 2025)   4.6E-03  

6720       1838   1851      1900   M3.2      (April 13, 2025)   2.6E-02  

Fiji M 6.5 20:03 UT

Myanmar M 4.7 20:03 UT

 

6740       2037   2042      2051   C4.8      (April 13, 2025)   2.2E-03  

Kyushu M 4.7 20:38 UT

 

6760       2142   2149      2154   C4.8      (April 13, 2025)   2.1E-03  

6770       2155   2202      2211   M1.6      (April 13, 2025)   1.1E-02  

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  unsettled April 14 active April 15 major storms April 16.  Solar M-flare chance: 70% X-class: 15% proton storm: 10%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    18 28 14 04:00 6   80 164

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS).

Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04 14 17 08 2025  33.0 -116.6 5.2 SOUTHERN CALIFORNIA            M117 T76 R61 Z105 B94

04 14 09 18 2025 -56.0 -121.4 4.9 SOUTHERN EAST PACIFIC RISE"    M136 T52 R130 Z44 B83

04 14 08 43 2025  49.0 -119.5 2.5 NW OF OSOYOOS CANADA           M102 T84 R51 Z115 B93

04 14 08 03 2025  40.4 -124.9 2.5 WNW OF PETROLIA CA             M107 T75 R60 Z106 B88

04 14 07 53 2025  35.3 -117.8 2.8 WSW OF JOHANNESBURG CA         M114 T76 R60 Z106 B93

04 14 07 07 2025  31.5 -104.1 2.1 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04 14 04 43 2025  31.7 -104.2 2.2 W OF MENTONE TEXAS             M123 T84 R54 Z112 B105

04 14 04 05 2025 -40.1  174.4 4.2 PATEA NEW ZEALAND              M95 T22 R157 Z8 B39

04 14 04 05 2025  -6.1  150.1 4.6 KIMBE PAPUA NEW GUINEA         M59 T37 R133 Z42 B1

04 14 03 06 2025  33.0 -116.6 2.0 S OF JULIAN CA                 M117 T76 R61 Z105 B94

04 14 02 54 2025  40.4 -126.1 2.7 W OF FERNDALE CALIFORNIA       M106 T74 R61 Z105 B87

04 14 02 28 2025  31.7 -104.5 2.4 WHITES CITY NEW MEXICO         M123 T84 R55 Z111 B104

04 14 02 26 2025  36.3 -120.9 2.1 NEW IDRIA CA                   M112 T75 R61 Z105 B91

04 14 01 33 2025   0.5  126.1 5.3 WSW OF TERNATE INDONESIA       M36 T62 R123 Z58 B26

04 14 00 16 2025  31.7 -104.3 2.2 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

04 13 22 59 2025  58.4 -152.6 4.1 SOUTHERN ALASKA                M82 T80 R59 Z110 B78

04 13 22 54 2025  33.0 -116.6 3.3 S OF JULIAN CA                 M117 T76 R61 Z105 B94

04 13 22 46 2025  32.6 -115.7 2.4 PROGRESO B.C. MX               M117 T76 R61 Z105 B95

04 13 22 34 2025  38.2 -121.6 2.2 KM NNE OF ISLETON              M110 T76 R60 Z106 B91

04 13 22 11 2025  -1.5  -77.8 4.5 E OF PUYO ECUADOR              M158 T95 R66 Z106 B130

04 13 22 09 2025  19.0  -68.1 3.6 PUNTA CANA DOMINICAN REPUBLIC  M136 T110 R43 Z128 B139

04 13 21 49 2025  36.6 -121.3 2.4 TRES PINOS CA                  M111 T75 R61 Z105 B91

04 13 21 42 2025  58.0 -154.0 3.0 SOUTHERN ALASKA                M81 T79 R59 Z109 B77

04 13 21 34 2025  36.6 -121.3 2.9 TRES PINOS CA                  M111 T75 R61 Z105 B91

04 13 21 30 2025  10.4  -86.2 5.0 TAMARINDO COSTA RICA           M147 T91 R60 Z109 B122

04 13 20 19 2025  48.7 -119.5 2.5 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93

04 13 20 03 2025 -26.0 -178.3 6.5 THE FIJI ISLANDS               M95 T6 R143 Z24 B34

04 13 20 02 2025  19.8   95.6 4.7 TAUNGDWINGYI BURMA (MYANMAR)   M2 T97 R94 Z91 B60

04 13 19 56 2025  59.4 -152.1 3.0 SOUTHERN ALASKA                M81 T81 R58 Z111 B78

04 13 19 52 2025  -7.1  149.9 4.6 KANDRIAN PAPUA NEW GUINEA      M60 T37 R134 Z41 B2

04 13 19 35 2025  -9.1  123.9 4.9 PANTE MAKASAR TIMOR LESTE      M41 T60 R132 Z51 B27

04 13 18 42 2025  48.8 -119.5 2.1 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93

04 13 17 44 2025  32.1 -101.1 2.0 S OF WESTBROOK TEXAS           M123 T86 R52 Z114 B107

04 13 17 22 2025  31.1  139.2 4.0 IZU ISLANDS JAPAN REGION"      M39 T68 R96 Z81 B38

04 13 17 15 2025 -44.2  -82.1 5.1 WEST CHILE RISE"               M157 T77 R105 Z71 B110

04 13 17 00 2025  17.9  -65.2 3.2 ESPERANZA PUERTO RICO          M136 T113 R43 Z129 B142

04 13 16 40 2025 -31.6 -178.5 5.1 KERMADEC ISLANDS REGION"       M97 T11 R147 Z19 B37

04 13 16 30 2025  31.7 -104.2 2.2 W OF MENTONE TEXAS             M123 T84 R54 Z112 B105

04 13 16 04 2025  -6.3  152.0 4.8 KOKOPO PAPUA NEW GUINEA        M61 T35 R133 Z42 B0

04 13 15 32 2025 -21.7  -70.3 4.6 NNW OF TOCOPILLA CHILE         M167 T94 R81 Z95 B130

04 13 15 31 2025  31.8 -103.8 2.0 WNW OF MENTONE TEXAS           M123 T84 R54 Z112 B105

04 13 15 13 2025  18.9  -65.2 3.3 CULEBRA PUERTO RICO            M135 T113 R42 Z129 B141

04 13 14 43 2025  40.8   36.1 4.4 WNW OF TAÅŸOVA TURKEY          M53 T147 R46 Z143 B113

04 13 14 34 2025  38.9   70.8 4.7 ESE OF RASHT TAJIKISTAN        M27 T121 R67 Z120 B86

04 13 14 30 2025 -11.0  164.2 4.8 LATA SOLOMON ISLANDS           M74 T23 R136 Z35 B13

04 13 14 01 2025  31.7 -104.1 2.0 W OF MENTONE TEXAS             M123 T84 R54 Z112 B105

04 13 13 59 2025  -6.2  152.1 5.0 KOKOPO PAPUA NEW GUINEA        M61 T35 R133 Z42 B0

04 13 13 46 2025  31.3   93.7 4.4 E OF NAGQU CHINA               M9 T102 R83 Z101 B66

04 13 13 25 2025  31.7 -104.1 2.7 W OF MENTONE TEXAS             M123 T84 R54 Z112 B105

04 13 12 26 2025  36.3  -89.5 2.2 N OF RIDGELY TENNESSEE         M121 T97 R42 Z124 B116

04 13 11 01 2025  48.8 -119.5 3.2 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93

04 13 10 50 2025  32.4 -115.3 2.3 DELTA B.C. MX                  M118 T76 R61 Z105 B95

04 13 09 40 2025  52.6  158.8 4.6 SE OF VILYUCHINSK RUSSIA       M56 T76 R74 Z99 B58

04 13 09 13 2025  48.7  149.8 5.9 THE KURIL ISLANDS              M50 T75 R78 Z96 B54

04 13 07 58 2025  -6.4  151.7 4.7 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z41 B0

04 13 06 14 2025  31.8 -103.8 2.0 WNW OF MENTONE TEXAS           M123 T84 R54 Z112 B105

04 13 05 39 2025  -3.1  126.3 4.4 SSE OF SANANA INDONESIA        M38 T60 R127 Z55 B25

04 13 05 00 2025  48.7 -119.5 2.7 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93

04 13 04 49 2025  48.7 -119.5 2.5 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93

04 13 04 24 2025  39.0   70.7 5.8 E OF RASHT TAJIKISTAN          M27 T121 R66 Z120 B86

04 13 04 15 2025 -60.1  -28.9 5.2 SOUTH SANDWICH ISLANDS REGION" M125 T94 R112 Z72 B114

04 13 03 48 2025  -6.7  147.4 5.5 LAE PAPUA NEW GUINEA           M57 T39 R134 Z42 B4

04 13 03 39 2025  35.3 -117.8 2.1 WSW OF JOHANNESBURG CA         M114 T76 R60 Z106 B93

04 13 03 11 2025  48.7 -119.5 2.9 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93

04 13 03 05 2025  52.1 -169.3 4.0 SSW OF NIKOLSKI ALASKA         M75 T72 R69 Z100 B66

04 13 02 24 2025  21.2   96.0 5.5 MEIKTILA BURMA (MYANMAR)       M0 T97 R93 Z92 B60

04 13 02 17 2025  48.7 -119.5 2.3 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93

04 13 01 46 2025  48.8 -119.5 3.1 NW OF TONASKET WASHINGTON      M102 T84 R52 Z114 B93

04 13 01 46 2025  31.7 -104.1 2.3 W OF MENTONE TEXAS             M123 T84 R54 Z112 B105

04 13 01 36 2025  39.0 -111.4 2.6 WNW OF EMERY UTAH              M114 T83 R54 Z112 B99

04 13 00 43 2025  34.9  142.1 4.4 SE OF HASAKI JAPAN             M42 T68 R92 Z84 B41

04 13 00 33 2025  -6.2  151.8 4.8 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04 13 00 12 2025  32.1 -102.2 3.1 NW OF MIDLAND TEXAS            M123 T86 R53 Z113 B106

 

.

April 13, 2025

 

The full moon arrived on April 13, 2025 at 00:22 UT. Longitudes which were at local solar midnight at this time are located at about 5 West while those at local solar noon are near 175 East. In the east these include most of western Europe and Iceland  and the Atlantic Ridges while in the west areas of the western Aleutians, Kamchatka,  Tonga/Fiji/Samoa and portions of New Zealand  and Vanuatu 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 considered moderate to high in the next week (April 11-19, 2025).

 

The full moon was accompanied by a flurry of moderately strong to strong earthquakes in many areas of the world. This included an M 5.9 (EMSC) to M 6.1 (NDI, BMG, GSRAS) in Tajikistan; an M 5.5 in Myanmar, the largest aftershock since the M 7.7 on March 28 with the past new moon; an M 5.5 (EMSC) to M 5.8 (BMG, BGS) in New Guinea; an M 5.2 in the South Sandwich Islands, an M 4.4 near Tokyo, Japan and an M 4.8 in New Britain all within about four hours after the full moon.

Another strong earthquake of M 5.9 (EMSC) to M 6.4 (GSRAS) occurred several hours

later in the area northwest of the Kuril Islands. These events were likely promoted in magnitude by tidal stresses associated with the full moon.

No tsunamis were expected with any of these events. Many of these were also associated with a pair of M-class solar flares as

reported by SWPC:

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

XXXX       0445   0452      0454   M2.3      (April 13, 2025)   2.3E-02*

XXXX       0345   0420      0430   M1.3      (April 13, 2025)   1.3E-02*

Tajikistan M 6.2 04:24 UT

NE Washington M 3.0, 2.4 .. 05:00 UT

South Sandwich Is. M 5.2 04:15 UT

Eastern New Guinea M 5.5 03:48 UT

Peru M 4.0 03:47 UT

 

The strongest of today's earthquakes (at this writing) was the M 5.9-6.4 in the

Kuril Islands. The local (Russian) network gave this event M 6.4 with the

following parameters:

 

O: 13APR2025 09:13:31 48.3N 150.2E MB=6.4  GSRAS  Northwest of the Kuril Islands

O: 13APR2025 09:13:33 48.3N 149.8E MB=5.9  EMSC   Northwest of the Kuril Islands

P: 19APR2025 171522   49.00 152.0E 3.5-5.5 CAAAA  So. Kurils                    

 

This epicenter is located at the seventh node (51 degrees) from the M 7.7

in Myanmar of March 28 and may have been promoted by energy from that source.

 

Forecast 171522 had expected this event in mid-May was likely within about 200 km of today's epicenter.

 

The last earthquake in the Kuril Islands within about 200 km of this epicenter

occurred on June 6, 2024 with M 5.9. Three events of larger magnitude in the

extended area of about 300 km from today's epicenter have occurred in the

past 35 years - an M 5.9 on October 3, 2001; an M 6.3 on July 8, 2004 and an M 6.8

on December 27, 2024. 

 

 

The epicenter of the M 5.5 in Myanmar was located midway between Mandalay and the capital of Myanmar - Naypyitaw where it was felt. But there were no immediate reported of new casualties or major damage with the M 5.5 today. In Wundwin people rushed out of buildings and some ceilings were reported to have collapsed.

NEIC reported the M 5.5 was felt with intensity VIII in Mandalay at Meiktila and V in Mandalay and III in Yamethin with III in Monywa, Sagaing, Myanmar and II in Thanyaburi Pathum, Thailand.

EMSC reported strong shaking in Myanmar at Wundwin, Meiktila, Thazi, Kyaukse, Patheingyi, Mandalay, Sagaing, Pyinoolwin, Aungmyaythazan, Patheingyi, Taunggyi.

Currently the official tolls from the M 7.7 on March 28 include 3649 dead and 5018 severely injured.

It is feared that a health emergency in Myanmar may be brewing as food and

care are in short supply. Today was the Thingyan holiday which is the traditional New Year's

day in Myanmar. The only aftershock of the M 7.7 of March 28 of magnitude larger

than M 5.5 occurred 12 minutes after the mainshock with M 6.7. At the time this

summary noted:

 

"The mainshock was followed 11 minutes and 7 seconds after the mainshock and was probably triggered

by a PcS phase returning to the epicenter after reflected off the core-mantle

boundary. Such returning phases often trigger major aftershocks of great earthquakes." (March 28, 2025)

 

Today's epicenter is located at the sixth node (60 degrees) from the M 5.9

in New Britain of April 4 and at the fourth node (90 degrees) from recent events in

the North Atlantic and New Zealand and may have been promoted by energy from those sources.

 

Forecasts 171409 had expected this earthquake was likely in Myanmar around April 14-17

within about 100 km of this epicenter.

 

O: 13APR2025 02:24:58 21.2N  96.0E MB=5.5  EMSC   Myanmar

P: 17APR2025 171409   20.0N  96.0E 4.0-5.8 BBAAA  Myanmar                       

P: 14APR2025 171409   21.0N  95.0E 4.0-6.0 AAAAA  Myanmar                       

 

 

The earthquake in Tajikistan was possibly felt with intensity up to VII but reported with intensity IV in Dushanbe and III in Navabadski, Tajikistan. It was also felt with intensity III in Tashkent, Uzbekistan and Os Kyrgyzstan with lesser shaking in Celalabad, Kyrgyzstan.

EMSC reported strong shaking in Tajikistan at Khujand, Dushanbe, Rutsunzoda, in Uzbekistan in Shahrikhan, Dzhizak, Tashkent, Samarqand, Shakhrisabz,  and Yashnobad, in Kyrgyzstan at Osh, in Kazakhstan at Shymkent and Bishkek.

 

The last earthquake of M>=5.9 within about 200 km of this epicenter occurred

as an M 5.9 on March 22, 2023. The last of larger magnitude was an M 6.0 on May 3, 2017.

At the time this  summary noted:

 

"A strong earthquake of M 5.9-6.0 hit the region of Tajikistan today and was felt

in Uzbekistan, Kyrgyzstan and Tajikistan. NEIC reported intensity V in Adfijon, Uzbekistan; IV in Dushanbe, Tajikistan and II-III in Tashkent, Uzbekistan, Os, Kyrgyzstan; and III in Biskek, Kyrgyzstan.

An M 4.8 aftershock followed about 50 minutes after the mainshock. The last earthquake

within about 200 km of this epicenter in Tajikistan with M>=5.9 occurred on June 26, 2016 about 150 km east of this epicenter

and prior to that as an M 6.1 about 50 km to the north on July 18, 2011." (May 3, 2017) 

 

This epicenter is at the third node (120 degrees) from recent large earthquakes

in Tonga and New Zealand and may have been promoted by energy from those sources.

 

Forecast 171437 had expected this earthquake in Tajikistan was likely around

April 17, 2025 within about 100 km of today's epicenter.

 

O: 13APR2025 04:24:02 39.0N  70.7E MB=5.9  EMSC   Tajikistan                      

O: 13APR2025 04:24:02 38.9N  70.6E ML=6.1  IND    Tajikistan                      

P: 17APR2025 171437   39.0N  72.0E 3.8-5.4 BAAAA  Hindu Kush/Pakistan           

 

NEIC reported the swarm in northeastern Washington State was being felt with intensity IV in Tonasket and II in Oroville, Washington.

The largest events in this series were reported felt in Seattle, Buckley and Omak, Washing and II in Washington at Federal Way, Loomis, Oroville, Riverside, and Coolin, Idaho.

 

The M 5.5 in Eastern New Guinea was initially reported felt with intensity III in Papua New Guinea at Lae, Morobe and Kainantu, Eastern Highlands.

This earthquake occurred near local solar noon and was likely promoted by tidal

stresses which maximize near this hour. The last earthquake with M>=5.5 within

about 200 km of this epicenter in New Guinea occurred as an M 5.6 on September 19, 2024

and prior to that on May 21, 2024 with M 5.7.

 

This epicenter is located near the ninth node (40 degrees) from Tonga, the sixth

node from Myanmar and the eighth node (135 degrees) form the North Atlantic

- all sites of recent strong earthquakes and may have been promoted by energy

related to those sources.

 

Forecast 171356 had expected enhanced seismicity within about 200 km of this

epicenter was likely in mid-April.

 

O: 13APR2025 03:48:24  6.7S 147.4E ML=5.5  EMSC   Eastern New Guinea Region, P.N.G.

O: 13APR2025 03:48:24  6.7S 147.4E ML=5.7  GSRAS  Eastern New Guinea Region, P.N.G.

P: 17APR2025 171356    7.0S 145.0E 4.0-5.5 BABAA  New Ireland                   

 

A moderate M 5.0 (EMS) to M 5.5 (NSMC - Pakistan's National Seismic Monitoring Centre) earthquake also struck Pakistan today. NEIC reported it was felt in Pakistan in the Pumjab region with intensity VI (minor damage) at Hazro; V in Attock, Txila and Wah and in Haripur, Northwest Frontier; IV in Islamabad, Abottabad, Topi, Zaida, Rawalpindi and III in Mardan, Chiniot, Jauharabad, Kalur and II in Peshawar, and Ghurgushti.

There were no immediate reports of major damage or casualties. NSMC reported the quake was felt strongly in Punjab at Attock, Chakwal and Mianwal districts and adjacent region. Lighter shaking occurred

in Peshawar, Mardan, mohmand and Shabqadar in Kyber Pakhtunkhwa Province. This

is an area where a major earthquake occurred in 2005 killing almost 75,000 people

near Gujarat.

 

The last earthquake in Pakistan within about 200 km of this epicenter with M>=5.0

occurred as an M 5.2 on December 5, 2024 and as an M 5.1 on August 20, 2024.

At the time this summary noted:

 

"NEIC reported an earthquake of M 5.2 in Pakistan was felt with intensity up to IV in the area(s) of Pakistan at Jhelum and Kharian, Punjab and in Himachal Pradesh, India at Bakloh. Intensity III was felt in Punjab at Kahna, Lahore with lesser shaking in Jalapur, Shekhupura and Islamabad.

EMSC added it was felt with moderate intensity in New Amritsar, India and in Pakistan at Lahore, and Daulat Nagar." December 5, 2024)

 

and

 

"A pair of unusual earthquakes shook the region of northern India near the Pakistan border today.

NEIC reported these earthquakes of M 5.1  and M 5.1 in Jammu and Kashmir, India was felt with intensity up to IV in the area(s) of Jammu and Kashmir, India at Baramula (VI), Uri (IV) and Srinagar (III).

EMSC reported two strong jolts in India at Spopore, Khawaja Bagh, Soyibug, Bachharura, Sora, Srinagar, Hafiz Bagh, Chadoora, and in areas of Pakistan." (August 20, 2024)

 

Today's earthquake, like that earlier in New Ireland (see above) occurred within

minutes of local solar noon and was coincident with a strong solar flare. SWPC

data for this flare follow:

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

XXXX       0700   0720      0730   M1.0      (April 12, 2025)   1.3E-02*

Pakistan M 5.1 07:30 UT

Ecuador M 4.0 07:11 UT

Nepal M 4.3 07:32 UT

 

 

The epicenter in Pakistan is at the fifth node (72 degrees) from the M 6.9 in the

Reykjanes Ridge and at the third node from Tonga (120 degrees) and may have been promoted

by energy from thoses sources.

 

O: 12APR2025 07:30:46 33.8N  72.6E ML=5.0  EMSC   Pakistan

P: 12APR2025 171357    5.0S 151.0E 4.0-5.9 AABAA  New Ireland                   

 

 

NEIC reported an earthquake of M 3.1 in Western Texas was felt with  intensity up to II-III in the area(s) of Western Texas with IV in Midland; II in Lubbock.

EMSC reported it with M 3.5 was felt with moderate intensity in Carlsbad, New Mexico.

 

NEIC reported an earthquake of M 4.5 in Guam was felt with  intensity up to II-III in the area(s) of Guam with III in Tamuning, Dededo and II in Merizo and Yigo, Guam.

 

NEIC reported an earthquake of M 3.3 in Hawaii was felt with  intensity up to II-III in the area(s) of Hawaii with III at Pahala, Pahoa, Volcano and II in Hakalau, Hilo, Honomu, Kihei, Laupahoehoe, Mountain View and Pepeekeo.

 

EMSC reported an earthquake of M 4.2 in Peru was felt with  intensity up to IV in the area(s) of Peru at Ate.

 

EMSC reported an earthquake of M 4.4 in Coquimbo, Chile was felt with  intensity up to I2 in the area(s) of Santiago, Chile.

CSN reported the following parameters for this earthquake:

 

12-04-2025  22:49  31.55S 71.32W  40  4.7    IV   Coquimbo at Canela, Illapel, Punitaqui; III in Los Vilos, Salamanca and Combarbala, Chile.

 

TROPICAL CYCLONE 29S                  

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    29S      2025-04-13  00:00 UT  12.2S  125.8E  045 kts  North of Australia 

 

Tropical 29S continued today in the area north of Australia and south of the Banda Sea, Indonesia with winds up to 045 kts.  It is likely to help promote seismicity in the Banda Sea in the next several days. The antipode of this epicenter is at 12N 55W, an area of the north Atlantic with little seismicity, But as it continued to track to the southwest the antipode will encounter the Leeward and Windward Islands of the eastern Caribbean. Should this storm continue it could enhance seismicity in that region around April 14-16, 2025.

 

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

XXXX       0445   0452      0454   M2.3      (April 13, 2025)   2.3E-02*

XXXX       0400   0420      0430   M1.3      (April 13, 2025)   1.3E-02*

 

 

6110       0036   0044      0055   C5.6      (April 12, 2025)   6.5E-03  

6130       0131   0138      0140   C4.0      (April 12, 2025)   2.4E-03      

Turkey M 4.3 01:37 UT

 

6140       0221   0230      0237   C4.0      (April 12, 2025)   1.8E-03      

6240       0258   0306      0314   C3.8      (April 12, 2025)   4.7E-03      

Oaxaca M 4.1 03:07  UT

 

6150       0314   0323      0326   C3.7      (April 12, 2025)   1.6E-03      

Tonga M 5.3 03:16 UT

 

6160       0333   0339      0342   C8.2      (April 12, 2025)   3.5E-03      

New Ireland M 6.1 03:47 UT

 

6250       0441   0445      0455   M1.1      (April 12, 2025)   2.0E-03  

Tonga M 4.9 04:48 UT

 

6180       0455   0500      0502   C9.5      (April 12, 2025)   5.1E-03  

6190       0536   0549      0555   M1.2      (April 12, 2025)   1.0E-02  

6210       0711   0719      0722   M1.0      (April 12, 2025)   4.7E-03  

Pakistan M 5.1 07:31 UT

 

6260       0734   0747      0757   C8.4      (April 12, 2025)   2.1E-03  

Nepal M 4.3 07:33 UT

 

6220       0757   0802      0809   C7.6      (April 12, 2025)   6.1E-03  

San Francisco M 2.0 07:57 UT

 

6270       0952   1002      1010   C4.8      (April 12, 2025)   1.4E-03  

Indian-Antarctic Ridge M 5.0 09:59 UT

 

6280       1010   1019      1021   C5.8      (April 12, 2025)   6.2E-03  

6300       1021   1026      1034   C9.2      (April 12, 2025)   7.1E-03  

Myanmar M 4.2 10:33 UT

 

6290       1105   1117      1125   M2.0      (April 12, 2025)   1.6E-02  

Myanmar M 4.0 11:15 UT

 

6310       1135   1143      1145   M2.7      (April 12, 2025)   3.2E-03  

6320       1233   1240      1252   M2.3      (April 12, 2025)   2.2E-02  

South Sandwich Is. M 5.0 12:37 UT

New Britain M 4.6 12:52 UT

 

6340       1425   1434      1441   C4.6      (April 12, 2025)   2.9E-03  

Barbar, Indonesia M 4.2 14:31 UT

 

6350       1500   1512      1519   M1.3      (April 12, 2025)   1.4E-03  

6370       1941   1944      1947   C5.5      (April 12, 2025)   2.2E-03  

6400       2044   2054      2117   C6.1      (April 12, 2025)   1.2E-02  

Northern Mexico M 4.2 21:03 UT

Banda Sea M 4.3 21:05 UT

 

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  active April 13 unsettled April 14 quiet April 15.  Solar M-flare chance: 70% X-class: 15% proton storm: 10%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    20 32 13 17:00 5  103 165

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS).

Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04 13 09 13 2025  48.7  149.8 5.9 THE KURIL ISLANDS              M50 T75 R78 Z96 B54

04 13 09 13 2025  48.3  150.2 6.4 NORTHWEST OF THE KURIL ISLANDS M50 T75 R79 Z95 B54

04 13 09 13 2025  48.3  149.8 5.9 NORTHWEST OF THE KURIL ISLANDS M50 T75 R79 Z95 B54

04 13 07 58 2025  -6.4  151.7 4.7 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z41 B0

04 13 05 39 2025  -3.1  126.3 4.4 SSE OF SANANA INDONESIA        M38 T60 R127 Z55 B25

04 13 05 00 2025  48.9 -119.5 2.4 SSW OF OROVILLE WASHINGTON     M102 T84 R52 Z115 B93

04 13 04 24 2025  39.0   70.7 5.9 TAJIKISTAN                     M27 T121 R66 Z120 B86

04 13 04 24 2025  39.0   70.7 5.8 E OF RASHT TAJIKISTAN          M27 T121 R66 Z120 B86

04 13 04 24 2025  38.9   70.6 6.1 TAJIKISTAN                     M27 T122 R66 Z120 B86

04 13 04 15 2025 -60.1  -28.9 5.2 SOUTH SANDWICH ISLANDS REGION" M125 T94 R112 Z72 B114

04 13 03 48 2025  -6.7  147.4 5.7 EASTERN NEW GUINEA REGION, P.N M57 T39 R134 Z42 B4

04 13 03 48 2025  -6.7  147.4 5.5 LAE PAPUA NEW GUINEA           M57 T39 R134 Z42 B4

04 13 03 48 2025  -6.7  147.4 5.5 EASTERN NEW GUINEA REGION, P.N M57 T39 R134 Z42 B4

04 13 03 39 2025  35.3 -117.8 2.1 WSW OF JOHANNESBURG CA         M114 T76 R60 Z106 B93

04 13 03 11 2025  48.8 -119.5 2.6 N OF TONASKET WASHINGTON       M102 T84 R52 Z114 B93

04 13 03 05 2025  52.1 -169.3 4.0 SSW OF NIKOLSKI ALASKA         M75 T72 R69 Z100 B66

04 13 02 58 2025  31.5 -104.0 2.0 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04 13 02 24 2025  21.2   96.0 5.5 MYANMAR                        M0 T97 R93 Z92 B60

04 13 02 24 2025  21.2   96.0 5.5 MEIKTILA BURMA (MYANMAR)       M0 T97 R93 Z92 B60

04 13 01 46 2025  48.7 -119.5 3.1 NNW OF TONASKET WASHINGTON     M102 T84 R52 Z114 B93

04 13 01 46 2025  31.7 -104.1 2.3 W OF MENTONE TEXAS             M123 T84 R54 Z112 B105

04 13 00 43 2025  34.9  142.1 4.4 SE OF HASAKI JAPAN             M42 T68 R92 Z84 B41

04 13 00 33 2025  -6.2  151.8 4.8 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04 13 00 12 2025  32.1 -102.2 3.1 NW OF MIDLAND TEXAS            M123 T86 R53 Z113 B106

04 12 23 11 2025  40.8 -123.3 2.7 WNW OF WEAVERVILLE CA          M107 T76 R59 Z107 B90

04 12 22 49 2025 -31.5  -71.5 4.4 WNW OF ILLAPEL CHILE           M165 T89 R90 Z86 B124

04 12 22 46 2025  36.1  -97.8 2.1 KM E OF HENNESSEY              M120 T91 R48 Z119 B110

04 12 21 05 2025  -4.7  125.5 4.3 S OF SANANA INDONESIA          M39 T60 R128 Z54 B26

04 12 20 43 2025  35.3 -117.8 2.2 W OF JOHANNESBURG CA           M114 T76 R60 Z106 B93

04 12 18 57 2025 -14.2  -13.8 4.6 SOUTHERN MID-ATLANTIC RIDGE"   M113 T140 R68 Z119 B155

04 12 18 29 2025  13.7  145.0 4.5 YIGO VILLAGE GUAM              M47 T52 R113 Z63 B20

04 12 17 42 2025  23.2  124.6 4.2 SSE OF ISHIGAKI JAPAN          M26 T73 R101 Z78 B39

04 12 17 13 2025  19.3 -155.4 3.3 NE OF PāHALA HAWAII           M99 T43 R93 Z74 B57

04 12 17 03 2025  31.5 -104.0 2.0 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04 12 15 53 2025  38.7 -122.8 2.4 SSW OF THE GEYSERS             M109 T75 R60 Z106 B90

04 12 13 53 2025 -18.0 -178.6 4.3 E OF LEVUKA FIJI               M92 T4 R136 Z31 B31

04 12 13 44 2025  36.7 -121.3 2.1 TRES PINOS CA                  M111 T75 R61 Z105 B91

04 12 13 32 2025  31.5 -115.7 2.0 MANEADERO B.C. MX              M118 T75 R61 Z104 B95

04 12 12 58 2025  32.3 -104.5 2.5 WHITES CITY NEW MEXICO         M122 T84 R54 Z112 B104

04 12 12 52 2025  -6.3  151.5 4.6 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04 12 12 37 2025 -56.0  -27.7 5.0 SOUTH SANDWICH ISLANDS REGION" M126 T98 R108 Z77 B118

04 12 12 19 2025  32.3 -104.5 3.5 WHITES CITY NEW MEXICO         M122 T84 R54 Z112 B104

04 12 12 17 2025  34.3 -119.5 2.2 SSE OF CARPINTERIA CA          M114 T74 R62 Z104 B92

04 12 12 09 2025 -29.6  -72.1 4.6 WNW OF COQUIMBO CHILE          M166 T89 R89 Z87 B125

04 12 10 52 2025  35.6  -96.7 2.0 NNW OF PRAGUE OKLAHOMA         M121 T91 R47 Z119 B111

04 12 10 26 2025  18.9  -65.0 3.6 AMALIE U.S. VIRGIN ISLANDS     M135 T113 R42 Z130 B142

04 12 09 59 2025 -49.2  123.0 5.0 WESTERN INDIAN-ANTARCTIC RIDGE M74 T57 R163 Z28 B49

04 12 09 37 2025  18.2  -65.1 3.1 CULEBRA PUERTO RICO            M135 T113 R42 Z129 B142

04 12 07 57 2025  37.9 -122.1 2.0 WALNUT CREEK CA                M110 T75 R60 Z105 B90

04 12 07 30 2025  33.8   72.6 5.0 ENE OF SANJWAL PAKISTAN        M23 T120 R71 Z115 B84

04 12 04 48 2025 -16.4 -173.7 4.8 SSE OF HIHIFO TONGA            M96 T3 R132 Z34 B35

04 12 03 47 2025  -4.7  153.2 6.1 KOKOPO PAPUA NEW GUINEA        M62 T35 R131 Z43 B1

04 12 03 16 2025 -16.6 -173.9 5.3 S OF HIHIFO TONGA              M96 T3 R133 Z34 B35

04 12 03 08 2025  45.3 -112.6 2.4 N OF DILLON MONTANA            M108 T85 R50 Z116 B98

04 12 01 37 2025  38.2   29.7 4.5 S OF ÇIVRIL TURKEY            M58 T152 R44 Z147 B118

04 12 01 22 2025  37.0 -121.6 2.3 WSW OF GILROY CA               M111 T75 R61 Z105 B90

04 12 00 48 2025  40.3 -124.5 2.8 W OF PETROLIA CA               M107 T75 R60 Z106 B89

04 12 00 21 2025  36.5  -98.8 2.1 KM SE OF WAYNOKA               M120 T90 R48 Z118 B109

 

 

 

April 12, 2025

 

The full moon will arrive on April 13, 2025 at 00:22 UT. Longitudes which are at local solar midnight at this time are located at about 5 West while those at local solar noon are near 175 East. In the east these include most of western Europe and Iceland  and the Atlantic Ridges while in the west areas of the western Aleutians, Kamchatka,  Tonga/Fiji/Samoa and portions of New Zealand  and Vanuatu 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 considered moderate to high in the next week (April 11-19, 2025).

 

A strong earthquake of M 6.2 (NEIC) to 6.3 (BGS) occurred in New Ireland, PNG today. NEIC reported it was felt with intensity III iNamatanai, New Ireland and Kokopo, New Britain, PNG.

This appears to be a regional aftershock of the M 6.9 in New Britain of April 4, 2025.

The last earthquake of M>=6.2 within about 200 km of this epicenter in New Ireland of equal or larger magnitude than

today's was an M 6.6 of November 15, 2024. This event also occurred with the

full moon of November 15, 2024  and had been noted at the time in

this summary as:

 

"The strongest earthquake in the world today was an M 6.6 in New Ireland, PNG. NEIC reported it was felt with maximum intensity IV in East New Britain at Kokopo and III in Namatanai, New Ireland.

This event of M 6.6 is the strongest within about 200 km of this epicenter since

an M 7.5 on May 14, 2019. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 7.5-7.7 in the New Britain

region of Papua New Guinea. NEIC reported it was felt with maximum intensity VII

in Rabaul, New Britain and VI in Kokopo; V in Namatanai, New Ireland; IV in Arawa, Solomon Islands and II-III in Kavleng, New Ireland and within about 500 km of the epicenter.

It was also reported felt with moderate to strong intensity in Port Vila, Lihir Island, Bougainville, Port Moresby with power blackouts in the

Kokopo area. PTWC issued a tsunami warning but this was later withdrawn. Villagers

near the epicenter on the west coast of New Ireland reported seeing the ocean

recede but no damaging waves were recorded. Damage did occur in New Britain but

immediate reports are unclear as to how great it was. This is the strongest

earthquake in the world during the year 2019 to date. An M 7.5 hit the region of Ecuador

on February 22, 2019, the largest previous during this year. This earthquake

was simultaneous with the strongest geomagnetic storm since August 26, 2018 when AP reached 76." (May 14, 2019, November 15, 2024)

 

Forecast 171357 had expected this earthquake was likely within about 200

km around April 12, 2025. This epicenter is at the tenth node (36 degrees)

from the earthquake of M 7.1 in Tonga of March 30 and at the sixth node (60 degrees)

from the M 7.7 in Myanmar of March 28 and may have been promoted by energy

from those sources.

 

Initial parameters for this earthquake from EMSC are:

 

O: 12APR2025 03:47:11  4.7S 153.2E ML=6.2  EMSC   New Ireland Region, PNG

P: 12APR2025 171357    5.0S 151.0E 4.0-5.9 AABAA  New Ireland                   

 

This earthquake occurred near local solar noon at a latitude which was near

sub-solar at the time of the event and may have been promoted by tidal and/or

geomagnetic effects which maximize near this hour. It may also have been

promoted by an C9.0-M1.0 class solar flare which was in progress at the time

of the earthquake.

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

XXXX       0333   0339      0350   M1.0      (April 12, 2025)   1.3E-02*

New Ireland M 6.1 03:47 UT

 

A moderate M 5.0 earthquake also struck Pakistan today. NEIC reported it was felt in Pakistan in the Pumjab region with intensity VI (minor damage) at Hazro; V in Attock, Txila and Wah and in Haripur, Northwest Frontier; IV in Islamabad, Abottabad, Topi, Zaida, Rawalpindi and III in Mardan, Chiniot, Jauharabad, Kalur and II in Peshawar, and Ghurgushti.

The last earthquake in Pakistan within about 200 km of this epicenter with M>=5.0

occurred as an M 5.2 on December 5, 2024 and as an M 5.1 on August 20, 2024.

At the time this summary noted:

 

"NEIC reported an earthquake of M 5.2 in Pakistan was felt with intensity up to IV in the area(s) of Pakistan at Jhelum and Kharian, Punjab and in Himachal Pradesh, India at Bakloh. Intensity III was felt in Punjab at Kahna, Lahore with lesser shaking in Jalapur, Shekhupura and Islamabad.

EMSC added it was felt with moderate intensity in New Amritsar, India and in Pakistan at Lahore, and Daulat Nagar." December 5, 2024)

 

and

 

"A pair of unusual earthquakes shook the region of northern India near the Pakistan border today.

NEIC reported these earthquakes of M 5.1  and M 5.1 in Jammu and Kashmir, India was felt with intensity up to IV in the area(s) of Jammu and Kashmir, India at Baramula (VI), Uri (IV) and Srinagar (III).

EMSC reported two strong jolts in India at Spopore, Khawaja Bagh, Soyibug, Bachharura, Sora, Srinagar, Hafiz Bagh, Chadoora, and in areas of Pakistan." (August 20, 2024)

 

Today's earthquake, like that earlier in New Ireland (see above) occurred within

minutes of local solar noon and was coincident with a strong solar flare. SWPC

data for this flare follow:

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

XXXX       0700   0720      0730   M1.0      (April 12, 2025)   1.3E-02*

Pakistan M 5.1 07:30 UT

Ecuador M 4.0 07:11 UT

Nepal M 4.3 07:32 UT

 

 

The epicenter in Pakistan is at the fifth node (72 degrees) from the M 6.9 in the

Reykjanes Ridge and at the third node from Tonga (120 degrees) and may have been promoted

by energy from thoses sources.

 

O: 12APR2025 07:30:46 33.8N  72.6E ML=5.0  EMSC   Pakistan

P: 12APR2025 171357    5.0S 151.0E 4.0-5.9 AABAA  New Ireland                   

 

An earthquake of M 4.4 in the Gulf of California occurred today. This event

is at the sixth node (60 degrees) from the Reykjanes Ridge of April 3, 2025 (M 6.9) and at 104 degrees

from the M 6.8 in New Zealand of March 25, 2025 and may have been promoted by

energy from these sources. It was accompanied by a moderate increase

in seismicity in the northern Gulf of California and southern California.

 

TROPICAL CYCLONE 29S                  

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    29S      2025-04-12  00:00 UT  11.7S  126.4E  045 kts  North of Australia 

 

Tropical 29S continued today in the area north of Australia and south of the Banda Sea, Indonesia with winds up to 045 kts.  It began near the epicenter of the M 5.5-5.9 in Papua New Guinea yesterday. It is likely to help promote seismicity in the Banda Sea in the next several days. The antipode of this epicenter is at 12N 54W, an area of the north Atlantic with little seismicity, But as it continued to track to the southwest the antipode will encounter the Leeward and Windward Islands of the eastern Caribbean. Should this storm continue it could enhance seismicity in that region around April 13-15, 2025.

 

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 Standish with III and II in Janesville and Marysville and in Winnemucca, Nevada.

 

NEIC reported an earthquake of M 4.3 in the area of Tripura, India was felt with  intensity up to II-III in the area(s) of the area of Tripura, India at Gartala and Udaipur and in Bangladesh at Dacca and Tungi, Gazipur. 

EMSC reported big jolt in India at Agartala and Kohima Sadar, and in Bangladesh at Dhaka, Narayanganj.

 

EMSC reported an earthquake of M 4.0 in Morocco was felt with  intensity up to I in the area(s) of Morocco in Bni Yakhlef, El Maarif, and in Gibraltar.

 

EMSC reported earthquakes of M 4.6 and M 4.2 in Myanmar were felt with  intensity up to IV in the area(s) of Myanmar at Mandalay, Hlaingthaya, Tatkon and Naypyitaw.

 

EMSC reported an earthquake of M 2.3 in Central California was felt with  intensity up to II in the area(s) of Central California in Ridgecrest with a low rumble.

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

XXXX       0333   0339      0350   M1.0      (April 12, 2025)   1.3E-02*

New Ireland M 6.1 03:47 UT

 

XXXX       0700   0720      0730   M1.0      (April 12, 2025)   1.3E-02*

Pakistan M 5.1 07:30 UT

Ecuador M 4.0 07:11 UT

Nepal M 4.3 07:32 UT

 

5750       0703   0714      0727   C4.4      (April 11, 2025)   5.0E-03  

5760       0820   0828      0835   C3.7      (April 11, 2025)   7.5E-04  

5780       0947   0956      1000   C2.4      (April 11, 2025)   1.8E-03  

Xizang M 4.4 09:57 UT

 

5820       1152   1215      1238   C7.2      (April 11, 2025)   1.4E-02  

5860       1335   1339      1343   C4.1      (April 11, 2025)   2.2E-03  

New Guinea M 4.4 13:45 UT

Gulf of California M 4.4 14:00 UT

 

5890       1614   1625      1632   C7.4      (April 11, 2025)   1.7E-03  

5930       1634   1638      1640   C6.8      (April 11, 2025)   4.8E-03  

5900       1640   1650      1701   M1.0      (April 11, 2025)   1.3E-02  

5970       1846   1852      1854   C6.8      (April 11, 2025)   5.1E-03  

Chiapas M 3.6 18:48 UT

 

6000       1854   1859      1911   C6.8      (April 11, 2025)   7.7E-03  

6060       2208   2220      2233   M1.0      (April 11, 2025)   1.2E-02  

New Guinea M 5.0 22:24 UT

Iceland M 3.1 22:30 UT

 

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  minor storms April 12 active April 13 unsettled April 14.  Solar M-flare chance: 50% X-class: 5% proton storm: 5%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    18 22 14 01:00 5  121 170

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS).

Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04 12 13 53 2025 -18.0 -178.6 4.3 E OF LEVUKA FIJI               M92 T4 R136 Z31 B31

04 12 13 44 2025  36.7 -121.3 2.1 TRES PINOS CA                  M111 T75 R61 Z105 B91

04 12 13 32 2025  31.5 -115.7 2.0 MANEADERO B.C. MX              M118 T75 R61 Z104 B95

04 12 12 52 2025  -6.3  151.5 4.6 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04 12 12 37 2025 -56.0  -27.7 5.0 SOUTH SANDWICH ISLANDS REGION" M126 T98 R108 Z77 B118

04 12 12 19 2025  32.3 -104.5 3.5 WHITES CITY NEW MEXICO         M122 T84 R54 Z112 B104

04 12 12 17 2025  34.3 -119.5 2.2 SSE OF CARPINTERIA CA          M114 T74 R62 Z104 B92

04 12 12 09 2025 -29.6  -72.1 4.6 WNW OF COQUIMBO CHILE          M166 T89 R89 Z87 B125

04 12 10 52 2025  35.6  -96.7 2.0 NNW OF PRAGUE OKLAHOMA         M121 T91 R47 Z119 B111

04 12 10 26 2025  18.9  -65.0 3.6 AMALIE U.S. VIRGIN ISLANDS     M135 T113 R42 Z130 B142

04 12 09 59 2025 -49.2  123.0 5.0 WESTERN INDIAN-ANTARCTIC RIDGE M74 T57 R163 Z28 B49

04 12 09 37 2025  18.2  -65.1 3.1 CULEBRA PUERTO RICO            M135 T113 R42 Z129 B142

04 12 07 57 2025  37.9 -122.1 2.0 WALNUT CREEK CA                M110 T75 R60 Z105 B90

04 12 07 30 2025  33.8   72.6 5.0 ENE OF SANJWAL PAKISTAN        M23 T120 R71 Z115 B84

04 12 04 48 2025 -16.4 -173.7 4.8 SSE OF HIHIFO TONGA            M96 T3 R132 Z34 B35

04 12 03 47 2025  -4.7  153.2 6.1 KOKOPO PAPUA NEW GUINEA        M62 T35 R131 Z43 B1

04 12 03 16 2025 -16.6 -173.9 5.3 S OF HIHIFO TONGA              M96 T3 R133 Z34 B35

04 12 03 08 2025  45.3 -112.6 2.4 N OF DILLON MONTANA            M108 T85 R50 Z116 B98

04 12 01 22 2025  37.0 -121.6 2.3 WSW OF GILROY CA               M111 T75 R61 Z105 B90

04 12 00 48 2025  40.3 -124.5 2.8 W OF PETROLIA CA               M107 T75 R60 Z106 B89

04 12 00 21 2025  36.5  -98.8 2.1 KM SE OF WAYNOKA               M120 T90 R48 Z118 B109

04 11 22 24 2025  -5.6  146.6 5.0 MADANG PAPUA NEW GUINEA        M56 T41 R133 Z44 B5

04 11 21 47 2025  32.4 -102.1 2.7 LOS YBANEZ TEXAS               M123 T86 R53 Z113 B106

04 11 21 36 2025  40.3 -120.4 2.7 HONEY LAKE CA                  M109 T78 R58 Z108 B92

04 11 21 15 2025  49.4 -120.4 2.1 SE OF PRINCETON CANADA         M101 T84 R52 Z114 B93

04 11 20 59 2025  45.9 -120.2 2.0 SSE OF BICKLETON WASHINGTON    M104 T81 R54 Z112 B92

04 11 20 56 2025  35.9 -117.6 2.0 LITTLE LAKE CA                 M114 T77 R59 Z106 B94

04 11 20 41 2025  -4.6   68.8 4.7 CHAGOS ARCHIPELAGO REGION"     M37 T113 R100 Z91 B82

04 11 20 12 2025 -22.0  -68.7 4.3 NNE OF CALAMA CHILE            M165 T95 R80 Z95 B131

04 11 18 25 2025  -6.3  150.4 4.4 KIMBE PAPUA NEW GUINEA         M60 T37 R133 Z42 B1

04 11 18 20 2025  39.9 -120.8 2.3 SPRING GARDEN CA               M109 T77 R58 Z108 B91

04 11 17 48 2025  31.7 -104.4 2.0 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04 11 17 43 2025  31.6 -104.4 2.2 WHITES CITY NEW MEXICO         M123 T84 R55 Z111 B104

04 11 14 19 2025  16.4  -92.8 4.4 GUERRERO (EL CHICHONAL) MEXICO M140 T87 R59 Z109 B116

04 11 14 12 2025  41.4  -72.6 1.6 NNW OF KILLINGWORTH CONNECTICU M116 T111 R29 Z138 B127

04 11 14 12 2025  35.3 -117.8 2.1 WSW OF JOHANNESBURG CA         M114 T76 R60 Z106 B93

04 11 14 05 2025  -1.6  126.4 4.4 NE OF SANANA INDONESIA         M37 T61 R125 Z56 B25

04 11 14 03 2025  33.9 -116.0 2.1 TWENTYNINE PALMS CA            M116 T77 R60 Z106 B95

04 11 13 58 2025  33.9 -116.0 2.1 TWENTYNINE PALMS CA            M116 T77 R60 Z106 B95

04 11 13 46 2025  -2.7  139.2 4.3 W OF ABEPURA INDONESIA         M48 T48 R129 Z49 B12

04 11 11 37 2025  19.6  -65.4 3.4 VIEQUES PUERTO RICO            M134 T113 R41 Z130 B141

04 11 11 34 2025  55.2 -157.2 3.1 ALASKA PENINSULA               M81 T76 R63 Z106 B74

04 11 10 52 2025  23.9   91.2 4.3 NW OF AGARTALA INDIA           M4 T102 R89 Z97 B66

04 11 10 26 2025  19.3  -65.8 3.1 SUáREZ PUERTO RICO            M135 T112 R42 Z129 B141

04 11 09 57 2025  28.6   87.3 4.3 NE OF LOBUCHE NEPAL            M10 T106 R83 Z103 B70

04 11 08 31 2025  40.2 -121.3 2.0 WSW OF ALMANOR CA              M109 T77 R58 Z108 B91

04 11 08 02 2025  39.4 -119.6 2.4 NNE OF VIRGINIA CITY, NEVADA   M110 T78 R58 Z108 B92

04 11 07 58 2025  44.4 -116.1 2.4 SMITHS FERRY IDAHO             M107 T83 R53 Z113 B95

04 11 07 35 2025  41.1 -124.0 2.4 E OF WESTHAVEN-MOONSTONE CA    M107 T76 R59 Z107 B89

04 11 06 56 2025  33.5 -116.5 2.2 ESE OF ANZA CA                 M116 T76 R60 Z105 B94

04 11 05 46 2025  29.3  130.5 4.5 S OF YUDOMARI JAPAN            M31 T72 R96 Z82 B40

04 11 05 41 2025  29.2  130.5 4.6 S OF YUDOMARI JAPAN            M31 T72 R97 Z82 B40

04 11 05 28 2025  37.2 -118.2 2.3 BIG PINE CA                    M112 T77 R59 Z107 B93

04 11 05 26 2025   1.5  127.5 4.3 WSW OF TOBELO INDONESIA        M36 T61 R123 Z58 B25

04 11 05 15 2025  39.6 -123.0 2.3 LAKE PILLSBURY CA              M108 T76 R60 Z106 B90

04 11 05 15 2025  29.2  130.6 4.4 S OF KOSHIMA JAPAN             M32 T72 R97 Z82 B40

04 11 05 06 2025  29.2  130.4 5.0 NE OF TATSUGō JAPAN           M31 T72 R97 Z82 B40

04 11 04 29 2025  20.9   96.0 4.8 MEIKTILA BURMA (MYANMAR)       M1 T97 R93 Z92 B60

04 11 03 38 2025  -6.1  151.7 5.2 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04 11 03 18 2025  18.9  145.5 4.9 REGION NORTHERN MARIANA ISLAND M46 T55 R108 Z67 B25

04 11 02 53 2025  33.2 -115.6 2.5 NW OF CALIPATRIA CA            M117 T76 R60 Z106 B95

04 11 02 52 2025  33.2 -115.6 3.3 WNW OF CALIPATRIA CA           M117 T76 R60 Z106 B95

04 11 02 42 2025  41.4 -112.2 2.2 W OF WILLARD UTAH              M111 T83 R52 Z113 B98

04 11 02 28 2025  35.3 -117.8 2.0 WSW OF JOHANNESBURG CA         M114 T76 R60 Z106 B93

04 11 02 26 2025  31.9 -103.8 2.1 NW OF MENTONE TEXAS            M123 T84 R54 Z112 B105

04 11 01 57 2025  56.6 -155.9 3.2 ALASKA PENINSULA               M81 T78 R61 Z107 B75

04 11 01 30 2025  31.5 -115.6 2.1 OVIEDO MOTA B.C. MX            M118 T75 R61 Z105 B95

04 11 00 19 2025  18.9  -66.5 3.2 NUEVAS PONIENTE PUERTO RICO    M135 T112 R43 Z129 B140

 

April 11, 2025

 

 

The full moon will arrive on April 13, 2025 at 00:22 UT. Longitudes which are at local solar midnight at this time are located at about 5 West while those at local solar noon are near 175 East. In the east these include most of western Europe and Iceland  and the Atlantic Ridges while in the west areas of the western Aleutians, Kamchatka,  Tonga/Fiji/Samoa and portions of New Zealand  and Vanuatu 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 considered moderate to high in the next week (April 11-19, 2025).

 

The strongest earthquake in the world today was an M 5.5 (NEIC, EMSC) to M 5.9 (BMG)  in Papua New Guinea. NEIC reported it was felt with intensity II in Kiunga Fly River, PNG.

The last earthquake in New Guinea within about 250 km of this epicenter with M>=5.9

occurred on December 30, 2023 with M 6.5 and prior to that as an M 5.9 on January 12, 2021.

Nearly all the major or moderate earthquakes in PNG in this area occur

about 200 km north of today's epicenter. There have been no earthquakes 

of M>=5.9 recorded within about 200 km of today's epicenter in the past 35 years.

An M 7.0 did occur on April 6, 2013 about 200 km north of today's epicenter.

At the time this summary noted:

 

 

"The strong earthquake of M 7.0-7.3 in Papua New Guinea was felt with intensity

V in Mulia, IV in Tanah Merah, Sentani, Wamena, Jayapura, Genyem, Mamberamo,

III-IV in Sarmi, and Waropen and III in Merauke, Mapi and II in Timika,

New Guinea according to data from the local network - BMG. NEIC reported

intensity III in Aberpura, Papua, Indonesia. No tsunami was observed

or expected with this earthquake and the quake epicenter was on land but panicked crowds in eastern Papua

rushed into the streets. Slight damage is expected in the mountainous

areas but this has not yet been reported. The last strong earthquake in

this general area of New Guinea occurred as an M 7.0 on June 16, 2010.

This event was about 300 km northwest of today's epicenter.

 

The Los Angeles area of Southern California is located at 103 degrees from

this epicenter in New Guinea. Several light earthquake occurred in that area

today. Seismic energy is concentrated at this distance following major earthquakes

due to refraction and reflection off the core-mantle boundary to this

distance zone. Seismicity is often seen to increase at this distance following

major earthquakes. For example, the two great earthquake in this area of

Papua New Guinea in the past 50 years occurred on January 10, 1971 (M 8.1)

and on September 12, 1979 (M 8.0). These were followed by earthquakes in

San Fernando, Southern California on February 9, 1971 (M 6.7) and October 15, 1979

in Baja California (M 7.0) respectively. Both occurred about a month after

the major Papua earthquake and were both highly damaging." (May 6, 2013)

 

This earthquake was followed by an upsurge in seismicity at 103-104 degrees from the epicenter

in Southern California which has included several events of M>=3. This is

expected to continue, however the moderate size of the PNG event is unlikely

to trigger moderate or strong events in southen California at this time.

 

The earthquake in New Guinea was followed less than a minute later by an M 4.8

in the northern Mid-Atlantic  an earthquake of M  4.8. These events coincided

with the peak of a strong C-class solar flare - the strongest of the day and were

probably triggered by SFE from that flare.

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

5610       0741   0752      0802   C5.3      (April 10, 2025)   7.8E-04  

New Guinea M 5.9 07:53 UT

North Atlantic M 4.8 07:54 UT

Durango, Mexico M 4.0 07:58 UT

Baja California M 3.4 08:02 UT

 

BMG (the local Indonesian Earthquake network)  reported intensity up to V in the epicentral area near Agats and Kepi, PNG

near the coast. No damage or casualties had been announced nor were to be expected.

BMG reported the following data for this earthquake.

 

O: 10APR2025 07:53:26  5.9S 138.8E ML=5.9  BMG    Asmat-Papuasltn, Indonesia

 

 

NEIC reported an earthquake of M 4.8 in Myanmar was felt with  intensity up to IV in the area(s) of Myanmar at Sagaing.

EMSC reported moderate shaking in Myanmar at Thazi, Meiktila, Tatkon, Mandalay, Patheingyi, Pyinoolwin, Dagon Myothit, Hlaingthaya.

EMSC also reported an M 4.2 in Myanmar today was felt in Tada U, Sagaing, Chanmyathazi, Mandalay, Patheingyi, Pyinoolwin, Taunggyi.

 

NEIC reported an earthquake of M 4.6 in Northern Mariana Islands was felt with  intensity up to II-III in the area(s) of Northern Mariana Islands in Tinian.

 

NEIC reported earthquakes of M 2.5, M 3.3, M 3.1,  in Southern California were felt with  intensity up to II-III in the area(s) of Southern California in Westmorland and San Diego (III) and Calipatria and Brawley (II)  and Irvine.

 

An M 3.2 was also felt in southern California east of Los Angeles today. NEIC reported it was felt with intensity III in Desert Hot Springs, Rancho Mirage and Los Angeles with II in Walnut, Indio, Palm Desert, Joshua Tree, La Quinta, Palm Springs and Yucaipa.

 

NEIC reported an earthquake of M 3.3 in Kenai Peninsula, Alaska was felt with  intensity up to II-III in the area(s) of Kenai Peninsula, Alaska with III in Homer and Soldotna and  II in Kasilof and Sterling.

 

NEIC reported an earthquake of M 4.2 in El Salvador was felt with  intensity up to II-III in the area(s) of El Salvador with III in Ilopango, San Salvador and II in Nuevo Cuscatlan La Libertad.

EMSC reported rapid shaking in San Salvador and Nueva San Salvador.

 

NEIC reported an earthquake of M 4.4 in Northern India was felt with  intensity up to II-III in the area(s) of Northern India at Kukatpalle, Andhra Pradesh.

 

EMSC reported an earthquake of M 3.9 in Java, Indonesia was felt with  intensity up to IV in the area(s) of Java, Indonesia with a loud noise at Bogor Selatan, Barat, Tengah, Timur, Sukaraja, Ciawi, Bogor Utara, Tanah Sareal, Tajur Halang, Cibinong, Cileungsi, Pamulang, Sefu, Bekasi, Jakarta, Kemayoran.

 

 

 

TROPICAL CYCLONE 29S                  

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    29S      2025-04-11  00:00 UT  10.0S  129.4E  045 kts  North of Australia 

 

Tropical 29S formed today in the area north of Australia and south of the Banda Sea, Indonesia with winds up to 045 kts.  It began near the epicenter of the M 5.5-5.9 in Papua New Guinea yesterday. It is likely to help promote seismicity in the Banda Sea in the next several days. The antipode of this epicenter is at 10N 51W, an area of little seismicity, But as it continued to track to the southwest the antipode will encounter the Leeward and Windward Islands of the eastern Caribbean. Should this storm continue it could enhance seismicity in that region around April 12-14, 2025.

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

5580       0446   0450      0454   C2.3      (April 10, 2025)   1.1E-03  

Ceram Sea M 4.2 04:55 UT

New Britain M 4.7 04:39 UT

 

5590       0624   0628      0632   C3.2      (April 10, 2025)   7.6E-04  

Northern Peru M 4.2 06:24 UT

 

5600       0638   0643      0648   C3.1      (April 10, 2025)   1.9E-03  

5610       0741   0752      0802   C5.3      (April 10, 2025)   7.8E-04  

New Guinea M 5.9 07:53 UT

North Atlantic M 4.8 07:54 UT

Baja California M 3.4 08:02 UT

 

5630       0814   0818      0822   C2.7      (April 10, 2025)   1.3E-03  

New Britain M 5.2 08:21 UT

 

5640       1022   1029      1046   C1.5      (April 10, 2025)   2.3E-03      

Nicaragua M 3.8 10:33 UT

Guam M 4.6 10:17 UT

Los Lagos M 4.3 10:17 UT

 

5670       1638   1651      1708   C3.7      (April 10, 2025)   5.4E-03  

Halmahera M 4.4 16:40 UT

 

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  minor storms April 12 active April 11 and 13.  Solar M-flare chance: 45% X-class: 5% proton storm: 5%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    17 30 11 07:00 6  112 153

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS).

Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

 

04 11 21 36 2025  40.3 -120.4 2.7 HONEY LAKE CA                  M109 T78 R58 Z108 B92

04 11 20 56 2025  35.9 -117.6 2.0 LITTLE LAKE CA                 M114 T77 R59 Z106 B94

04 11 20 41 2025  -4.6   68.8 4.7 CHAGOS ARCHIPELAGO REGION"     M37 T113 R100 Z91 B82

04 11 20 12 2025 -22.0  -68.7 4.3 NNE OF CALAMA CHILE            M165 T95 R80 Z95 B131

04 11 18 25 2025  -6.3  150.4 4.4 KIMBE PAPUA NEW GUINEA         M60 T37 R133 Z42 B1

04 11 18 20 2025  39.9 -120.8 2.3 SPRING GARDEN CA               M109 T77 R58 Z108 B91

04 11 17 48 2025  31.7 -104.4 2.0 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04 11 17 43 2025  31.6 -104.4 2.2 WHITES CITY NEW MEXICO         M123 T84 R55 Z111 B104

04 11 14 19 2025  16.4  -92.8 4.4 GUERRERO (EL CHICHONAL) MEXICO M140 T87 R59 Z109 B116

04 11 14 12 2025  35.3 -117.8 2.1 WSW OF JOHANNESBURG CA         M114 T76 R60 Z106 B93

04 11 14 05 2025  -1.6  126.4 4.4 NE OF SANANA INDONESIA         M37 T61 R125 Z56 B25

04 11 14 03 2025  33.9 -116.0 2.1 TWENTYNINE PALMS CA            M116 T77 R60 Z106 B95

04 11 13 58 2025  33.9 -116.0 2.1 TWENTYNINE PALMS CA            M116 T77 R60 Z106 B95

04 11 13 46 2025  -2.7  139.2 4.3 W OF ABEPURA INDONESIA         M48 T48 R129 Z49 B12

04 11 11 37 2025  19.6  -65.4 3.4 VIEQUES PUERTO RICO            M134 T113 R41 Z130 B141

04 11 11 34 2025  55.2 -157.2 3.1 KENAI ALASKA                   M81 T76 R63 Z106 B74

04 11 10 52 2025  23.9   91.2 4.3 NW OF AGARTALA INDIA           M4 T102 R89 Z97 B66

04 11 10 26 2025  19.3  -65.8 3.1 SUáREZ PUERTO RICO            M135 T112 R42 Z129 B141

04 11 09 57 2025  28.6   87.3 4.3 NE OF LOBUCHE NEPAL            M10 T106 R83 Z103 B70

04 11 08 31 2025  40.2 -121.3 2.0 WSW OF ALMANOR CA              M109 T77 R58 Z108 B91

04 11 08 02 2025  39.4 -119.6 2.4 NNE OF VIRGINIA CITY           M110 T78 R58 Z108 B92

04 11 07 58 2025  44.4 -116.1 2.7 SMITHS FERRY IDAHO             M107 T83 R53 Z113 B95

04 11 07 35 2025  41.1 -124.0 2.4 E OF WESTHAVEN-MOONSTONE CA    M107 T76 R59 Z107 B89

04 11 06 56 2025  33.5 -116.5 2.2 ESE OF ANZA CA                 M116 T76 R60 Z105 B94

04 11 05 46 2025  29.3  130.5 4.5 S OF YUDOMARI JAPAN            M31 T72 R96 Z82 B40

04 11 05 41 2025  29.2  130.5 4.6 S OF YUDOMARI JAPAN            M31 T72 R97 Z82 B40

04 11 05 28 2025  37.2 -118.2 2.3 BIG PINE CA                    M112 T77 R59 Z107 B93

04 11 05 26 2025   1.5  127.5 4.3 WSW OF TOBELO INDONESIA        M36 T61 R123 Z58 B25

04 11 05 15 2025  39.6 -123.0 2.3 LAKE PILLSBURY CA              M108 T76 R60 Z106 B90

04 11 05 15 2025  29.2  130.6 4.4 S OF KOSHIMA JAPAN             M32 T72 R97 Z82 B40

04 11 05 06 2025  29.2  130.4 5.0 NE OF TATSUGō JAPAN           M31 T72 R97 Z82 B40

04 11 04 29 2025  20.9   96.0 4.8 MEIKTILA BURMA (MYANMAR)       M1 T97 R93 Z92 B60

04 11 03 38 2025  -6.1  151.7 5.2 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04 11 03 18 2025  18.9  145.5 4.9 REGION NORTHERN MARIANA ISLAND M46 T55 R108 Z67 B25

04 11 02 53 2025  33.2 -115.6 2.5 NW OF CALIPATRIA CA            M117 T76 R60 Z106 B95

04 11 02 52 2025  33.2 -115.6 3.3 WNW OF CALIPATRIA CA           M117 T76 R60 Z106 B95

04 11 02 42 2025  41.4 -112.2 2.2 W OF WILLARD UTAH              M111 T83 R52 Z113 B98

04 11 02 28 2025  35.3 -117.8 2.0 WSW OF JOHANNESBURG CA         M114 T76 R60 Z106 B93

04 11 02 26 2025  31.9 -103.8 2.1 NW OF MENTONE TEXAS            M123 T84 R54 Z112 B105

04 11 01 57 2025  56.6 -155.9 3.2 SOUTHERN ALASKA                M81 T78 R61 Z107 B75

04 11 01 30 2025  31.5 -115.6 2.1 OVIEDO MOTA B.C. MX            M118 T75 R61 Z105 B95

04 11 00 19 2025  18.9  -66.5 3.2 NUEVAS PONIENTE PUERTO RICO    M135 T112 R43 Z129 B140

04 10 23 59 2025  24.0  122.5 4.3 SW OF YONAKUNI JAPAN           M24 T75 R100 Z80 B41

04 10 23 05 2025  35.3 -117.8 2.0 W OF JOHANNESBURG CA           M114 T76 R60 Z106 B93

04 10 20 40 2025  60.0 -151.5 3.3 SOUTHERN ALASKA                M81 T82 R57 Z111 B79

04 10 19 35 2025  13.1  -89.1 4.2 EL ROSARIO EL SALVADOR         M144 T89 R59 Z109 B119

04 10 18 23 2025  44.3 -115.2 2.3 WNW OF STANLEY IDAHO           M108 T83 R52 Z114 B96

04 10 18 13 2025  36.9 -121.6 2.1 ENE OF AROMAS CA               M111 T75 R61 Z105 B90

04 10 17 16 2025  -8.0  158.5 4.9 BUALA SOLOMON ISLANDS          M68 T29 R134 Z39 B7

04 10 16 40 2025   3.1  128.5 4.4 NNE OF TOBELO INDONESIA        M36 T61 R122 Z59 B24

04 10 16 25 2025  36.5 -121.1 2.0 SE OF PINNACLES CA             M112 T75 R61 Z105 B91

04 10 16 22 2025  38.9 -123.3 2.1 SSE OF BOONVILLE CA            M109 T75 R60 Z106 B89

04 10 16 17 2025  21.7   95.9 3.9 SAGAING BURMA (MYANMAR)        M0 T97 R93 Z92 B61

04 10 16 15 2025  36.5 -121.1 2.3 SE OF PINNACLES CA             M112 T75 R61 Z105 B91

04 10 16 10 2025  34.0 -116.8 2.1 N OF CABAZON CA                M116 T76 R60 Z106 B94

04 10 16 01 2025  13.2   50.7 4.3 N OF CALUULA SOMALIA           M43 T136 R75 Z116 B102

04 10 15 46 2025  36.4  -89.5 2.1 NW OF TIPTONVILLE TENNESSEE    M121 T97 R42 Z124 B116

04 10 15 42 2025   1.6  127.1 4.3 NNW OF TERNATE INDONESIA       M36 T61 R123 Z58 B25

04 10 15 40 2025 -22.3  -71.6 4.3 W OF TOCOPILLA CHILE           M168 T93 R82 Z93 B129

04 10 13 38 2025  33.9 -116.2 3.2 THOUSAND PALMS CA              M116 T76 R60 Z106 B95

04 10 13 35 2025  35.9   77.9 4.4 NE OF THANG INDIA              M20 T116 R72 Z113 B80

04 10 12 49 2025  33.2 -115.6 3.1 WNW OF CALIPATRIA CA           M117 T76 R60 Z106 B95

04 10 12 26 2025  33.2 -115.6 2.5 SW OF NILAND CA                M117 T76 R60 Z106 B95

04 10 12 09 2025  51.6 -175.2 3.5 ANDREANOF ISLANDS, ALASKA      M72 T71 R71 Z99 B63

04 10 10 17 2025  12.1  143.5 4.6 MERIZO VILLAGE GUAM            M46 T52 R115 Z61 B19

04 10 10 16 2025 -39.6  -74.9 4.3 WNW OF CORRAL CHILE            M160 T83 R99 Z78 B117

04 10 08 55 2025  33.2 -115.6 2.7 SW OF NILAND CA                M117 T76 R60 Z106 B95

04 10 08 27 2025  40.2 -124.7 2.8 W OF PETROLIA CA               M107 T75 R60 Z106 B88

04 10 08 20 2025  -6.3  151.3 5.2 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04 10 08 09 2025  18.9  -64.3 3.2 BAY U.S. VIRGIN ISLANDS        M134 T114 R42 Z130 B142

04 10 07 54 2025  29.7  -42.6 4.8 NORTHERN MID-ATLANTIC RIDGE"   M114 T135 R24 Z152 B152

04 10 07 53 2025  -5.9  138.8 5.9 PAPUA NEW GUINEA, INDONESIA    M50 T48 R132 Z46 B12

04 10 07 53 2025  -5.9  138.7 5.5 SE OF AGATS INDONESIA          M50 T48 R132 Z46 B12

04 10 06 47 2025  35.6  -84.4 1.6 ENE OF SWEETWATER TENNESSEE    M122 T101 R40 Z127 B120

04 10 06 36 2025  17.9  -68.5 3.4 DE YUMA DOMINICAN REPUBLIC     M137 T110 R44 Z127 B139

04 10 06 35 2025  31.7 -104.4 2.4 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04 10 06 35 2025  31.7 -104.4 2.3 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04 10 06 24 2025  -6.1  -75.8 4.3 N OF NAVARRO PERU              M162 T95 R69 Z104 B131

04 10 05 26 2025 -29.5 -112.3 5.1 EASTER ISLAND REGION"          M153 T56 R107 Z63 B92

04 10 05 24 2025  33.3 -115.7 2.4 BOMBAY BEACH CA                M117 T76 R60 Z106 B95

04 10 05 16 2025  51.7 -178.2 3.9 ANDREANOF ISLANDS, ALASKA      M70 T71 R72 Z98 B62

04 10 05 12 2025  29.0   86.6 4.1 N OF LOBUCHE NEPAL             M10 T107 R82 Z103 B71

04 10 04 39 2025  -6.4  151.4 4.7 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04 10 04 36 2025  52.0 -167.8 3.8 SE OF NIKOLSKI ALASKA          M76 T72 R69 Z100 B67

04 10 03 11 2025  18.4  -64.7 3.3 BAY U.S. VIRGIN ISLANDS        M135 T113 R42 Z129 B142

04 10 02 48 2025  36.6 -121.1 2.1 NNE OF PINNACLES CA            M112 T75 R61 Z105 B91

04 10 02 43 2025  -6.3  151.4 5.4 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04 10 02 04 2025  14.5  -92.9 4.1 PUERTO MADERO MEXICO           M142 T86 R60 Z107 B116

04 10 02 00 2025  40.4 -124.0 2.3 RIO DELL CA                    M107 T76 R60 Z106 B89

04 10 01 43 2025  36.0 -117.7 3.5 E OF LITTLE LAKE               M114 T77 R59 Z106 B93

04 10 01 41 2025  31.7 -104.4 2.2 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04 10 01 40 2025  31.7 -104.4 2.1 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04 10 01 13 2025  36.9  141.3 4.3 ESE OF IWAKI JAPAN             M41 T70 R90 Z86 B43

04 10 01 09 2025  31.7 -104.2 2.0 W OF MENTONE TEXAS             M123 T84 R54 Z112 B105

04 10 00 48 2025  31.7 -104.3 2.2 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

 

 

April 10, 2025

 

The strongest earthquake in the world today was an M 5.5 (NEIC, EMSC) to M 5.9 (BMG)  in Papua New Guinea. NEIC reported it was felt with intensity II in Kiunga Fly River, PNG.

The last earthquake in New Guinea within about 250 km of this epicenter with M>=5.9

occurred on December 30, 2023 with M 6.5 and prior to that as an M 5.9 on January 12, 2021.

Nearly all the major or moderate earthquakes in PNG in this area occur

about 200 km north of today's epicenter. There have been no earthquakes 

of M>=5.9 recorded within about 200 km of today's epicenter in the past 35 years.

An M 7.0 did occur on April 6, 2013 about 200 km north of today's epicenter.

At the time this summary noted:

 

 

"The strong earthquake of M 7.0-7.3 in Papua New Guinea was felt with intensity

V in Mulia, IV in Tanah Merah, Sentani, Wamena, Jayapura, Genyem, Mamberamo,

III-IV in Sarmi, and Waropen and III in Merauke, Mapi and II in Timika,

New Guinea according to data from the local network - BMG. NEIC reported

intensity III in Aberpura, Papua, Indonesia. No tsunami was observed

or expected with this earthquake and the quake epicenter was on land but panicked crowds in eastern Papua

rushed into the streets. Slight damage is expected in the mountainous

areas but this has not yet been reported. The last strong earthquake in

this general area of New Guinea occurred as an M 7.0 on June 16, 2010.

This event was about 300 km northwest of today's epicenter.

 

The Los Angeles area of Southern California is located at 103 degrees from

this epicenter in New Guinea. Several light earthquake occurred in that area

today. Seismic energy is concentrated at this distance following major earthquakes

due to refraction and reflection off the core-mantle boundary to this

distance zone. Seismicity is often seen to increase at this distance following

major earthquakes. For example, the two great earthquake in this area of

Papua New Guinea in the past 50 years occurred on January 10, 1971 (M 8.1)

and on September 12, 1979 (M 8.0). These were followed by earthquakes in

San Fernando, Southern California on February 9, 1971 (M 6.7) and October 15, 1979

in Baja California (M 7.0) respectively. Both occurred about a month after

the major Papua earthquake and were both highly damaging." (May 6, 2013)

 

This earthquake was followed by an upsurge in seismicity at 103-104 degrees from the epicenter

in Southern California which has included several events of M>=3. This is

expected to continue, however the moderate size of the PNG event is unlikely

to trigger moderate or strong events in southen California at this time.

 

The earthquake in New Guinea was followed less than a minute later by an M 4.8

in the northern Mid-Atlantic  an earthquake of M  4.8. These events coincided

with the peak of a strong C-class solar flare - the strongest of the day and were

probably triggered by SFE from that flare.

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

XXXX       0730   0753      0810   C6.0      (April 10, 2025)   1.5E-03  

Papua New Guinea M 5.5 07:53 UT

Northern Mid-Atlantic M 4.8 07:54 UT

Durango, Mexico M 4.0 07:58 UT

 

BMG (the local Indonesian Earthquake network)  reported intensity up to V in the epicentral area near Agats and Kepi, PNG

near the coast. No damage or casualties had been announced nor were to be expected.

BMG reported the following data for this earthquake.

 

O: 10APR2025 07:53:26  5.9S 138.8E ML=5.9  BMG    Asmat-Papuasltn, Indonesia

 

 

The strongest earthquakes in the U.S. or Canada today were an  M 3.9 and M 3.8 in the Fox

Islands, Aleutians, Alaska. It was not reported felt in this remote area but may have been felt with intensity II in the Nikolski, Alaska area.

 

Aftershocks also continued in the area of New Britain following the M 6.9 there

of April 4, 2025. The largest of these was an M 5.4 which NEIC reported was likely felt with intensity IV in the epicentral area near Kimbe, Papua New Guinea.

 

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 in Onyx.

 

NEIC reported earthquakes of M 4.3 and M 4.5 off eastern Honshu, Japan were felt with  intensity up to II-III in the area(s) of Honshu, Japan in Aomori Prefecture.

 

NEIC reported an earthquake of M 3.1 in Central Alaska was felt with  intensity up to II-III in the area(s) of Central Alaska at Talkeetna.

 

No tropical cyclones are currently active

 

A tropical cyclone may be forming in the Banda Sea, Indonesia. This system is currently

locat at 8S 130E and moving to the southwest with winds up to 30 kts. It began near the

epicenter of the M 5.5 in Papua New Guinea yesterday. It is likely to help

promote seismicity in the Banda Sea in the next several days. The antipode

of this epicenter is at 9N 50W, an area of little seismicity, But as it

continued to track to the southwest the antipode will encounter the Leeward

and Windward Islands of the eastern Caribbean. Should this storm continue

it could enhance seismicity in that region around April 12-14, 2025.

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

XXXX       0730   0755      0810   C6.0      (April 10, 2025)   1.5E-03  

Papua New Guinea M 5.5 07:53 UT

Northern Mid-Atlantic M 4.8 07:54 UT

Durango, Mexico M 4.0 07:58 UT

Baja California M 3.4 08:02 UT

 

5370       0102   0109      0117   C1.9      (April 9, 2025)   1.2E-03  

5380       0131   0143      0153   C3.8      (April 9, 2025)   4.2E-03      

Tawan M 5.8 01:53 UT

 

5390       0516   0527      0534   C3.3      (April 9, 2025)   2.6E-03  

5420       0832   0845      0857   C2.2      (April 9, 2025)   1.1E-03      

New Britain M 5.0 08:45 UT

Myanmar M 4.0 08:47 UT

Nevada M 2.0 08:41 UT

 

5430       0933   0949      1002   C2.5      (April 9, 2025)   4.2E-03  

5460       1053   1103      1115   C2.2      (April 9, 2025)   2.7E-03  

Michoacan M 4.1 11:15 UT

 

5470       1216   1231      1244   C2.7      (April 9, 2025)   5.8E-04  

Colombia M 4.2 12:41 UT

 

5490       1456   1505      1510   C2.1      (April 9, 2025)   1.3E-03      

5530       1722   1730      1737   C9.0      (April 9, 2025)   4.8E-03  

Fiji M 4.9 17:25 UT

Myanmar M 3.5 17:25 UT

 

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  unsettled April 10 active April 11-12.  Solar M-flare chance: 45% X-class: 5% proton storm: 5%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    22 44 20 08:00 6  113 167

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of M 7.7 of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.0 (M)4.0 for the world)  during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS).

Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

 

04 10 14 38 2025  38.5 -122.8 2.1 KM ESE OF WINDSOR              M109 T75 R60 Z105 B90

04 10 13 38 2025  33.9 -116.2 3.2 THOUSAND PALMS CA              M116 T76 R60 Z106 B95

04 10 13 35 2025  35.9   77.9 4.4 NE OF THANG INDIA              M20 T116 R72 Z113 B80

04 10 12 49 2025  33.2 -115.6 3.0 WNW OF CALIPATRIA CA           M117 T76 R60 Z106 B95

04 10 12 26 2025  33.2 -115.6 2.5 SW OF NILAND CA                M117 T76 R60 Z106 B95

04 10 10 16 2025 -39.6  -74.9 4.3 WNW OF CORRAL CHILE            M160 T83 R99 Z78 B117

04 10 08 55 2025  33.2 -115.6 2.7 SW OF NILAND CA                M117 T76 R60 Z106 B95

04 10 08 27 2025  40.2 -124.7 2.8 W OF PETROLIA CA               M107 T75 R60 Z106 B88

04 10 08 20 2025  -6.3  151.3 5.2 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04 10 08 09 2025  18.9  -64.3 3.2 BAY U.S. VIRGIN ISLANDS        M134 T114 R42 Z130 B142

04 10 07 54 2025  29.7  -42.6 4.8 NORTHERN MID-ATLANTIC RIDGE"   M114 T135 R24 Z152 B152

04 10 07 53 2025  -5.9  138.8 5.9 ASMAT-PAPUASLTN, INDONESIA     M50 T48 R132 Z46 B12

04 10 07 53 2025  -5.9  138.7 5.5 SE OF AGATS INDONESIA          M50 T48 R132 Z46 B12

04 10 06 36 2025  17.9  -68.5 3.4 DE YUMA DOMINICAN REPUBLIC     M137 T110 R44 Z127 B139

04 10 06 24 2025  -6.1  -75.8 4.3 N OF NAVARRO PERU              M162 T95 R69 Z104 B131

04 10 05 26 2025 -29.5 -112.3 5.1 EASTER ISLAND REGION"          M153 T56 R107 Z63 B92

04 10 05 12 2025  29.0   86.6 4.1 N OF LOBUCHE NEPAL             M10 T107 R82 Z103 B71

04 10 04 39 2025  -6.4  151.4 4.7 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04 10 04 36 2025  52.0 -167.8 3.8 SE OF NIKOLSKI ALASKA          M76 T72 R69 Z100 B67

04 10 03 11 2025  18.4  -64.7 3.3 BAY U.S. VIRGIN ISLANDS        M135 T113 R42 Z129 B142

04 10 02 48 2025  36.6 -121.1 2.1 NNE OF PINNACLES CA            M112 T75 R61 Z105 B91

04 10 02 43 2025  -6.3  151.4 5.4 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04 10 02 04 2025  14.5  -92.9 4.1 PUERTO MADERO MEXICO           M142 T86 R60 Z107 B116

04 10 02 00 2025  40.4 -124.0 2.3 RIO DELL CA                    M107 T76 R60 Z106 B89

04 10 01 43 2025  36.0 -117.7 3.5 E OF LITTLE LAKE               M114 T77 R59 Z106 B93

04 10 01 41 2025  31.7 -104.4 2.2 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04 10 01 40 2025  31.7 -104.4 2.0 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04 10 01 28 2025  33.4 -116.7 2.1 WARNER SPRINGS CA              M116 T76 R61 Z105 B94

04 10 01 13 2025  36.9  141.3 4.3 ESE OF IWAKI JAPAN             M41 T70 R90 Z86 B43

04 10 01 09 2025  31.7 -104.2 2.0 W OF MENTONE TEXAS             M123 T84 R54 Z112 B105

04 10 00 48 2025  31.7 -104.3 2.2 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

04  9 23 33 2025  39.2  141.8 4.5 SSW OF KAMAISHI JAPAN          M42 T72 R88 Z88 B45

04  9 21 21 2025  38.2 -116.0 2.2 KM NNW OF RACHEL               M113 T79 R57 Z109 B95

04  9 21 21 2025  32.4 -102.1 2.4 LOS YBANEZ TEXAS               M123 T86 R53 Z113 B106

04  9 20 46 2025  -7.6  128.2 4.5 LOSPALOS TIMOR LESTE           M43 T57 R132 Z50 B23

04  9 20 42 2025 -22.1   69.0 5.3 MID-INDIAN RIDGE"              M51 T105 R113 Z78 B81

04  9 20 41 2025  31.6 -104.2 1.7 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  9 20 13 2025  52.0 -171.1 3.9 SW OF NIKOLSKI ALASKA          M74 T72 R70 Z100 B65

04  9 19 56 2025  34.5    9.6 4.4 WSW OF MEZZOUNA TUNISIA        M74 T165 R34 Z158 B134

04  9 19 08 2025  -6.6  151.2 4.3 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z41 B0

04  9 18 10 2025  52.2 -171.2 3.4 FOX ISLANDS, ALASKA            M74 T72 R69 Z100 B66

04  9 18 01 2025  62.6 -149.8 3.1 CENTRAL ALASKA                 M81 T84 R55 Z114 B81

04  9 17 25 2025 -25.9 -178.8 4.9 THE FIJI ISLANDS               M95 T7 R143 Z24 B34

04  9 17 20 2025  49.4 -120.5 2.3 SSE OF PRINCETON CANADA        M101 T83 R52 Z114 B93

04  9 16 55 2025  45.9 -111.5 2.2 LOGAN MONTANA QUARRY           M107 T86 R49 Z117 B99

04  9 16 37 2025  38.8 -122.8 2.2 WNW OF COBB CA                 M109 T75 R60 Z106 B90

04  9 16 05 2025  38.3 -119.4 2.8 NW OF BRIDGEPORT CA            M111 T77 R59 Z107 B92

04  9 15 59 2025  21.7   96.0 3.5 KYAUKSE BURMA (MYANMAR)        M0 T97 R93 Z92 B61

04  9 15 21 2025   3.5  127.4 5.0 NNW OF TOBELO INDONESIA        M35 T62 R121 Z60 B26

04  9 14 40 2025  21.4   95.9 3.6 KYAUKSE BURMA (MYANMAR)        M0 T97 R93 Z92 B61

04  9 14 15 2025  -6.2  150.7 4.3 KIMBE PAPUA NEW GUINEA         M60 T37 R133 Z42 B1

04  9 14 01 2025  31.5 -104.0 2.5 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  9 12 52 2025  -0.1  126.0 4.3 WNW OF LABUHA INDONESIA        M36 T62 R124 Z58 B26

04  9 12 41 2025   4.5  -75.6 4.2 S OF CALARCá COLOMBIA         M152 T99 R59 Z112 B132

04  9 12 39 2025  31.7 -104.4 2.2 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04  9 12 13 2025  35.4 -117.8 2.3 W OF JOHANNESBURG CA           M114 T76 R60 Z106 B93

04  9 10 31 2025 -23.1  -66.8 4.4 EL AGUILAR ARGENTINA           M163 T96 R81 Z95 B132

04  9 09 49 2025  18.6  -66.1 3.0 SAN JUAN PUERTO RICO           M135 T112 R43 Z129 B141

04  9 08 44 2025  -6.1  151.0 5.0 KIMBE PAPUA NEW GUINEA         M60 T36 R133 Z42 B0

04  9 08 29 2025  -6.2  151.5 5.0 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  9 07 58 2025  22.8   95.9 4.7 SHWEBO BURMA (MYANMAR)         M0 T97 R92 Z93 B61

04  9 07 39 2025   8.1  -38.1 5.3 CENTRAL MID-ATLANTIC RIDGE"    M125 T135 R44 Z136 B170

04  9 07 25 2025   3.5  127.2 4.9 NNW OF TOBELO INDONESIA        M35 T62 R121 Z60 B26

04  9 06 21 2025  27.9  139.7 4.5 BONIN ISLANDS JAPAN REGION"    M39 T65 R99 Z77 B35

04  9 05 48 2025  38.8 -122.7 2.1 THE GEYSERS CA                 M109 T75 R60 Z106 B90

04  9 03 09 2025  40.0   39.5 4.1 SSE OF KELKIT TURKEY           M50 T145 R49 Z141 B110

04  9 03 06 2025  36.5  -89.6 1.9 NNE OF MARSTON MISSOURI        M121 T97 R42 Z124 B116

04  9 02 42 2025 -20.1 -178.0 4.4 FIJI REGION"                   M93 T3 R138 Z29 B32

04  9 01 53 2025  24.6  121.9 5.0 SSE OF YILAN TAIWAN            M24 T76 R99 Z81 B42

04  9 01 53 2025  24.6  121.8 5.8 NORTHERN TAIWAN                M23 T76 R99 Z81 B42

04  9 00 58 2025 -35.1  -73.9 4.5 W OF CONSTITUCIóN CHILE       M164 T86 R94 Z82 B120

04  9 00 10 2025  39.2  142.3 4.1 E OF KAMAISHI JAPAN            M42 T71 R88 Z88 B45

04  9 00 00 2025  38.2 -118.0 2.8 KM SSE OF MINA                 M112 T78 R58 Z108 B93

 

April 9, 2025

 

Two moderate earthquake of M 5.4-5.9 occurred today off northeastern Taiwan in the Ryukyu Islands, Japan. NEIC reported they were felt with intensity IV in Taiwan at Taipei,  Hsinchu, with III in Ilan, Taipei, Changhwa, Chiayi, and II in Taichung and Kaohsiung.

The last earthquake in Taiwan reported by CWB with M>=5.8 within about 200 km of today's

epicenter occurred as an M 5.9 on October 23, 2023. A major earthquake of M 7.4

about 250 km southwest of today's epicenter did considerable damage in

Taiwan a year ago on April 2, 2024 and was partially reported in this summary at

the time as:

 

 

"A major M 7.4 earthquake damaged much of the Island of Taiwan today. International Press reports indicated that this event and several

strong aftershocks killed at least 7 while injuring more than 700. The quake

occurred about 20 km south of Hualien and damaged and toppled buildings while

causing many damaging landslides. It is the strongest earthquake to hit

Taiwan in at least 25 years - since September 20, 1999 (M 7.7) - the strongest

event in Taiwan in the past 35 years. Major earthquakes have most recently

hit with M>=7.5 in Taiwan on November 14, 1986 (M 7.8); July 24, 1978 (M 8.0); April 24, 1972 (M 7.7) and January 25, 1972 (M 7.7)." (April 2, 2024)

 

CWB out of Taiwan reported it at M 5.9 with the following parameters:

 

 

O: 08APR2025 15:26:35 24.5N 123.2E ML=5.9  CWB    Off Northern Taiwan

 

CWB reported it was felt with intensity III in the counties of Taiwan at Hualien, and II in Yilan, Taipei, Taoyuan, Nantou, Taichung, Hsinchu, Miaoli, Taitung, Chiayi, Yunlin.

 

A second earthquake of M 5.8 was felt in a similar area. CWB gave this event

the following parameters:

 

 

O: 09APR2025 01:53:25 24.6N 121.8E ML=5.8  CWB    Northern Taiwan

 

NEIC reported an earthquake of M 4.1  in Eastern Turkey was felt with  intensity up to II-III in the area(s) of Eastern Turkey at Erzincan.

 

NEIC reported an earthquake of M 5.0 in Northern Chile  was felt with  intensity up to II-III in the area(s) of  Northern Chile in Iquique, Tarapaca.

This event appears to have been triggered by SFE from a solar flare which

maximized at the time of the earthquake.

 

 

An M 3.8 also occurred south of Hawaii today. It is likely to have felt lightly in southern Hawaii and in the Lo'ihi Seamount area but this was note confirmed.

It was preceded by smaller events of M 3.0 and M 3.1.

 

NEIC reported earthquakes of M 2.5 and M 2.9 in Nevada were felt with  intensity up to II-III in the area(s) of Nevada at Ridgecrest, California.

 

NEIC reported an earthquake of M 4.4 southwest of Honshu, Japan  was felt with  intensity up to II-III in the area(s) of  Honshu, Japan with III in Anjo, and Nagakute, Aichi and in Kakamigahara, Gifu and Hamamatsu, Shizuoka.

 

No tropical cyclones are currently active

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

5160       0502   0514      0525   C2.4      (April 8, 2025)   2.9E-03  

Myanmar M 4.3 05:19 UT

 

5170       0541   0603      0624   C3.0      (April 8, 2025)   6.7E-03  

Banda Sea M 4.5 05:40 UT

Guatemala M 4.0 05:58 UT

 

5250       1401   1407      1410   C1.7      (April 8, 2025)   9.5E-04  

Oaxaca M 4.1 14:01 UT

Dominican Republic M 3.4 14:06 UT

 

5290       1939   1946      1953   C2.7      (April 8, 2025)   1.1E-03       

5310       2045   2058      2107   C3.2      (April 8, 2025)   8.8E-04      

New Britain M 4.6 20:53 UT

Argentina M 4.4 21:13 UT

 

5330       2208   2222      2236   M1.5      (April 8, 2025)   1.5E-02  

Fiji M 4.6 22:11 UT

Chiapas M 3.9 22:14 UT

Antofagasta M 5.0 22:30 UT

 

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  minor storms April 9 active April 10-11.  Solar M-flare chance: 40% X-class: 5% proton storm: 5%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    24 30 20 17:00 6  130 159

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and from Myanmar of March 29 (white stipples) and earthquakes during the past day as reported by NEIC (colored circles).

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.5 during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS).

Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04  9 12 39 2025  31.7 -104.4 2.2 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04  9 12 13 2025  35.4 -117.8 2.3 W OF JOHANNESBURG CA           M114 T76 R60 Z106 B93

04  9 10 31 2025 -23.1  -66.8 4.4 EL AGUILAR ARGENTINA           M163 T96 R81 Z95 B132

04  9 09 49 2025  18.6  -66.1 3.0 SAN JUAN PUERTO RICO           M135 T112 R43 Z129 B141

04  9 08 44 2025  -6.1  151.0 5.0 KIMBE PAPUA NEW GUINEA         M60 T36 R133 Z42 B0

04  9 08 29 2025  -6.2  151.5 5.0 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  9 07 58 2025  22.8   95.9 4.7 SHWEBO BURMA (MYANMAR)         M0 T97 R92 Z93 B61

04  9 07 39 2025   8.1  -38.1 5.3 CENTRAL MID-ATLANTIC RIDGE"    M125 T135 R44 Z136 B170

04  9 07 25 2025   3.5  127.2 4.9 NNW OF TOBELO INDONESIA        M35 T62 R121 Z60 B26

04  9 06 21 2025  27.9  139.7 4.5 BONIN ISLANDS JAPAN REGION"    M39 T65 R99 Z77 B35

04  9 05 48 2025  38.8 -122.7 2.1 THE GEYSERS CA                 M109 T75 R60 Z106 B90

04  9 03 09 2025  40.0   39.5 4.1 SSE OF KELKIT TURKEY           M50 T145 R49 Z141 B110

04  9 02 42 2025 -20.1 -178.0 4.4 FIJI REGION"                   M93 T3 R138 Z29 B32

04  9 01 53 2025  24.6  121.9 5.0 SSE OF YILAN TAIWAN            M24 T76 R99 Z81 B42

04  9 01 53 2025  24.6  121.8 5.8 NORTHERN TAIWAN                M23 T76 R99 Z81 B42

04  9 00 10 2025  39.2  142.3 4.1 E OF KAMAISHI JAPAN            M42 T71 R88 Z88 B45

04  9 00 00 2025  38.2 -118.0 2.8 KM SSE OF MINA                 M112 T78 R58 Z108 B93

04  8 22 41 2025  34.0 -117.2 2.0 LOMA LINDA CA                  M116 T76 R60 Z105 B94

04  8 22 37 2025  28.9  -99.0 2.8 NORTH PEARSALL TEXAS           M127 T87 R53 Z113 B109

04  8 22 30 2025 -21.1  -68.4 5.0 NNW OF OLLAGüE CHILE          M165 T96 R79 Z96 B132

04  8 22 10 2025 -18.1 -179.7 4.6 E OF LEVUKA FIJI               M91 T5 R137 Z30 B30

04  8 21 13 2025 -24.4  -67.5 4.4 DE LOS COBRES ARGENTINA        M164 T95 R82 Z94 B131

04  8 19 30 2025  36.0 -117.5 2.5 SEARLES VALLEY CA              M114 T77 R59 Z107 B94

04  8 19 25 2025   4.7  125.1 5.0 SSW OF SARANGANI PHILIPPINES   M33 T64 R119 Z62 B28

04  8 16 28 2025   5.7  126.6 4.3 SSE OF PONDAGUITAN PHILIPPINES M33 T63 R119 Z62 B27

04  8 15 26 2025  24.9  123.1 5.4 N OF YONAKUNI JAPAN            M25 T75 R99 Z81 B41

04  8 15 26 2025  24.5  123.2 5.9 OFF NORTHERN TAIWAN            M25 T75 R100 Z80 B41

04  8 14 50 2025  31.7 -104.3 2.5 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

04  8 13 02 2025  10.6  -86.0 4.4 TAMARINDO COSTA RICA           M147 T91 R60 Z109 B122

04  8 12 55 2025  -6.1  151.6 4.5 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  8 12 13 2025  -6.3  151.3 4.6 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  8 11 30 2025 -20.3 -105.2 5.2 SOUTHEAST CENTRAL PACIFIC OCEA M160 T63 R96 Z74 B100

04  8 11 29 2025  -6.3  152.3 4.9 KOKOPO PAPUA NEW GUINEA        M61 T35 R133 Z41 B0

04  8 10 28 2025 -17.9  -69.7 4.8 ESE OF PALCA PERU              M165 T96 R77 Z98 B132

04  8 10 26 2025  34.9  137.1 4.4 ENE OF NISHIO JAPAN            M38 T71 R92 Z85 B42

04  8 09 49 2025  19.5  -65.3 3.7 VIEQUES PUERTO RICO            M134 T113 R41 Z130 B141

04  8 09 41 2025  40.5 -119.8 2.2 KM W OF EMPIRE                 M109 T78 R57 Z109 B92

04  8 09 30 2025   7.1  126.5 4.5 SAN IGNACIO PHILIPPINES        M33 T64 R117 Z64 B28

04  8 08 43 2025 -17.0  -72.7 4.2 S OF CAMANá PERU              M168 T94 R77 Z97 B130

04  8 08 43 2025  18.9 -155.2 3.5 ESE OF NAALEHU HAWAII          M99 T43 R93 Z74 B57

04  8 07 59 2025  18.8 -155.2 3.7 ESE OF NAALEHU HAWAII          M99 T42 R93 Z73 B57

04  8 07 36 2025 -14.1  170.5 4.6 VANUATU REGION"                M81 T16 R137 Z32 B20

04  8 06 51 2025  34.0 -117.2 2.1 MORENO VALLEY CA               M116 T76 R60 Z105 B94

04  8 06 25 2025  36.6  -89.6 1.8 WSW OF HOWARDVILLE MISSOURI    M121 T97 R42 Z124 B116

04  8 05 52 2025  36.6 -121.3 2.1 NNW OF PINNACLES CA            M111 T75 R61 Z105 B91

04  8 05 40 2025  -6.7  129.9 4.5 BANDA SEA"                     M43 T56 R131 Z50 B21

04  8 04 35 2025   0.7  123.8 4.7 WNW OF MODISI INDONESIA        M34 T64 R123 Z59 B28

04  8 03 55 2025   0.7  -29.6 5.3 CENTRAL MID-ATLANTIC RIDGE"    M122 T140 R51 Z132 B174

04  8 02 52 2025  66.2 -135.4 3.4 YUKON, CANADA                  M83 T90 R48 Z121 B88

04  8 02 23 2025  -6.0  128.1 4.1 S OF AMBON INDONESIA           M42 T57 R130 Z52 B23

04  8 01 37 2025 -11.5  166.2 4.7 LATA SOLOMON ISLANDS           M76 T21 R136 Z35 B15

 

 

April 8, 2025

 

The strongest earthquake in the world today was an M 5.8 (NEIC, EMSC) to 6.2 (BMG) in the region of Simeulue, Indonesia west of Sumatra. NEIC reported it was felt with intensity II in Sungai Ara Pulau, Pinang, Malaysia.

The last earthquake of M>=5.8 within about 200 km of this epicenter occurred

as an M 5.9 on May 28, 2024, the last of M>=6.2 was an M 6.3 on March 29, 2008.

At the time of the May, 2024 event this summary noted:

 

 

"The strongest earthquake in the world today was an M 5.9 in the region of northern

Sumatra, Indonesia.  This earthquake in Simuelue, Indonesia west of Sinabang, Indonesia is the

strongest event within about 200 km of this epicenter since an M 6.2 on September 23, 2022 and

a similar M 6.2 on January 7, 2020 and an M 5.9 on May 8, 2015. These appear to

be long-term aftershocks of the M 9+ earthquake and tsunami of December 26, 2004

which killed more than a quarter million around the Indian Ocean in the

earthquake and subsequent tsunami. At the time of the M 6.2 in September, 2022

this summary noted:

 

 

"An earthquake of M 6.2 was also widely felt in the area of Northern Sumatra and Malaysia today. NEIC reported intensity II-III in Banda Aceh, Indonesia, in Malaysia at Georgetown Pulau, Butterworth, Perai, and in Thailand at Phuket and Kathu.

BMG reported this earthquake with M 6.4 at 3.8N 96E. They reported maximum intensity IV in Aceh Selatan and Nagan Raya, Meulaboh, III in  Aceh Besar, Banda Aceh, Takengon, Bener Meriah, Simeulue and II in Pidie, Idi, Bireun, Aceh Tamiang, and Lansa.

A foreshock about 100 km north of the M 6.4 occurred about half an hour prior

to the mainshock. BMG reported it was felt with intensity IV in Takengon, Bener Meriah, and III in Idi, Reyeuk-Aceh, Timur and Aceh Barat Daya.

While an M 5.9 occurred about 100 km west of this epicenter on March 5, 2022,

the last earthquake within about 250 km of this epicenter with M>=6.2 per NEIC data

was an 6.2 about 200 km southeast of today's epicenter on January 7, 2020 and an M 6.5 about 200

km north of this on December 6, 2016. The last definitely within the 200 km

radius zone was an M 6.4 on July 25, 2012. This followed a major event ofr

M 8.6 about 300 km southwest of today's epicenter on April 11, 2012." (September 23, 2022, May 28, 2024)

 

The Antipode to this event is located at 2S 85W west of Ecuador and east of

the Galapagos Islands. Regional seismicity in this area could be enhanced

in the next several days, but the likelihood of a strong event in this

area promoted by the event in Sumatra today is small at this time.

 

 

This epicenter is located at 90.0 degrees (node 4) from the M 7.1 in Tonga of March 30

and was likely promoted by energy from that source.

 

BMG, the local network gave the following parameters for this earthquake:

 

O: 07APR2025 19:48:52  2.8N  94.7E ML=6.2  BMG    Sinabang-Aceh, Indonesia

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the central Andreanof Islands, Alaska. It may have been lightly felt in this remote area.

This epicenter is at the fifth node (72 degrees) from recent major earthquakes

in Myanmar, Tonga and the Reykjanes Ridge and was probably promoted by

constructive interference of energy from those three sources.

 

NEIC reported an earthquake of M 2.6 in Southern California was felt with  intensity up to II-III in the area(s) of Southern California at Indio, Indian Wells and La Quinta.

 

An M 3.8 also occurred south of Hawaii today. It is likely to have felt lightly in southern Hawaii and in the Lo'ihi Seamount area but this was note confirmed.

It was preceded by smaller events of M 3.0 and M 3.1.

 

 

NEIC reported an earthquake of M 3.5 in Western Arizona was felt with  intensity up to II-III in the area(s) of Western Arizona with III in Nevada at Henderson; II at Mesquite and Las Vegas.

 

A moderate M 5.3 hit the northern Marianas Islands north of Guam today. NEIC reported it was felt with maximum intensity IV in the Northern Marianas at Gualo Rai and Garapan, Saipan and in Tinian with III and with III in Guam at Tamuning and Santa Rita.

 

Moderate earthquakes also continued today as aftershocks in New Britain. The larger

of these around M 5.2 were probably felt in Kimbe and Port Moresby with light intensity.

 

A minor eruption of Mount Kanlaon in Central Philippines occurred today. It

lasted several hours and is part of an ongoing eruptive sequence in the area.

 

 

No tropical cyclones are currently active

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

4890       0641   0648      0653   C2.7      (April 7, 2025)   1.7E-03  

New Britain M 4.6 06:55 UT

 

5030       1456   1505      1509   C3.0      (April 7, 2025)   1.2E-03  

Fiji M 4.5 15:02 UT

 

5070       1509   1523      1528   C3.4      (April 7, 2025)   4.2E-03  

Peru M 4.4 15:24 UT

 

5060       1528   1536      1546   C5.3      (April 7, 2025)   9.4E-04  

New Britain M 5.0 15:28 UT

 

5040       1741   1747      1751   C2.3      (April 7, 2025)   1.3E-03  

5090       2005   2017      2031   C2.4      (April 7, 2025)   3.4E-03  

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  active April 8 unsettled April 9-10.  Solar M-flare chance: 55% X-class: 10% proton storm: 5%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    13 13 10 09:00 3  167 162

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and earthquakes during the past day as reported by NEIC (colored circles).

 

 

NODAL EARTHQUAKES LIKELY ASSOCIATED WITH REYKJANES RIDGE

 

Following are expected (and observed locations following the February, 2015 quake) of

far-field seismic enhancment at nodal distances from the M 6.9 in the Reykjanes

Ridge of April 3, 2025.

 

Antipodal (~180 degrees)

North Atlantic to Macquarie Islands, 

 

Outer shadow zone edge (141-148 degrees)

North Atlantic to Vanuatu, Kermadec Islands, 

 

Node 3 (120 degrees)

North Atlantic to Sumatra, Molucca, Talaud, Halmahera, 

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

North Atlantic to Aisen, Chile, Andaman Is. Taiwan, South Sandwich Islands, Volcano Islands, Honshu, Japan, 

 

Node 4 (90 degrees)

North Atlantic to Honshu, Japan, Central Chile, 

 

Node 5 (72 degrees)

North Atlantic to northern Peru, Pakistan, Andreanof Islands, Southern Mid-Atlantic, Northeast Pacific Rise, Peru,   

 

Node 6 (60 degrees)

North Atlantic to Nicaragua, Guatemala, Southern California, Alaska, Colombia, Central Mid-Atlantic, Mexico, Nevada, California, Costa Rica, 

 

Node 7 (52 degrees)

North Atlantic to Central Mid-Atlantic, Colorado, Texas, Idaho, Montana, Washington, British Columbia

 

 

DISTANCE RELATIONS FROM NEW BRITAIN

 

Antipodal (~180 degrees)

 

New Britain to Central Mid-Atlantic,

 

Outer shadow zone edge (141-148 degrees)

 

New Britain to Dominican Republic, Haiti, Puerto Rico,  Gibraltar,

 

Node 8 (135 degrees)

 

New Britain to Reykjanes Ridge, northern Chile, Peru, France,

 

 

Node 3 (120 degrees)

 

New Britain to Quebec, Guatemala, El Salavador, Dodecanese Islands, Nicaragua, Central Chile, Greece

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

 

New Britain to Iran, Greenland Sea, Svalbard, Western Texas, East Pacific Rise,  Alamosa, Colorado, Kansas, Baffin Bay, Iran, Michoacan, Jalisco, Mexico,  Greenland Sea, Mayotte, Southern Colorado, Iran, Gulf of Aden, Caucasus, Arctic Ocean, Idaho, Montana, Nevada, Oklahoma,

 

Node 4 (90 degrees)

 

New Britain to Coast of No. California, Nevada, Central, Southern California, Afghanistan, 

 

Node 5 (72 degrees)

 

New Britain to Alaska Peninsula, Fox Islands, 

 

Node 6 (60 degrees)

 

New Britain to Komandorsky Is, Nicobar Islands, India, Hawaii, Andreanof Is, Kamchatka, Myanmar, South of New Zealand, 

 

Node 7 (52 degrees)

 

New Britain to Sumatra, Honshu, Japan, 

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.5 during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS).

Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04  8 16 28 2025   5.7  126.6 4.3 SSE OF PONDAGUITAN PHILIPPINES M33 T63 R119 Z62 B27

04  8 15 26 2025  24.9  123.1 5.4 N OF YONAKUNI JAPAN            M25 T75 R99 Z81 B41

04  8 14 50 2025  31.7 -104.3 2.5 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

04  8 13 02 2025  10.6  -86.0 4.4 TAMARINDO COSTA RICA           M147 T91 R60 Z109 B122

04  8 11 30 2025 -20.3 -105.2 5.2 SOUTHEAST CENTRAL PACIFIC OCEA M160 T63 R96 Z74 B100

04  8 11 29 2025  -6.3  152.3 4.9 KOKOPO PAPUA NEW GUINEA        M61 T35 R133 Z41 B0

04  8 10 28 2025 -17.9  -69.7 4.8 ESE OF PALCA PERU              M165 T96 R77 Z98 B132

04  8 09 49 2025  19.5  -65.3 3.7 VIEQUES PUERTO RICO            M134 T113 R41 Z130 B141

04  8 09 41 2025  40.5 -119.8 2.2 KM W OF EMPIRE                 M109 T78 R57 Z109 B92

04  8 09 30 2025   7.1  126.5 4.5 SAN IGNACIO PHILIPPINES        M33 T64 R117 Z64 B28

04  8 08 43 2025 -17.0  -72.7 4.2 S OF CAMANá PERU              M168 T94 R77 Z97 B130

04  8 08 43 2025  18.9 -155.2 3.5 ESE OF NAALEHU HAWAII          M99 T43 R93 Z74 B57

04  8 07 59 2025  18.8 -155.2 3.7 ESE OF NAALEHU HAWAII          M99 T42 R93 Z73 B57

04  8 07 36 2025 -14.1  170.5 4.6 VANUATU REGION"                M81 T16 R137 Z32 B20

04  8 06 51 2025  34.0 -117.2 2.1 MORENO VALLEY CA               M116 T76 R60 Z105 B94

04  8 05 52 2025  36.6 -121.3 2.1 NNW OF PINNACLES CA            M111 T75 R61 Z105 B91

04  8 05 40 2025  -6.7  129.9 4.5 BANDA SEA"                     M43 T56 R131 Z50 B21

04  8 04 35 2025   0.7  123.8 4.7 WNW OF MODISI INDONESIA        M34 T64 R123 Z59 B28

04  8 03 55 2025   0.7  -29.6 5.3 CENTRAL MID-ATLANTIC RIDGE"    M122 T140 R51 Z132 B174

04  8 03 03 2025  33.5  -82.3 1.7 N OF HARLEM GEORGIA            M124 T102 R40 Z127 B123

04  8 02 52 2025  66.2 -135.4 3.4 YUKON, CANADA                  M83 T90 R48 Z121 B88

04  8 02 23 2025  -6.0  128.1 4.1 S OF AMBON INDONESIA           M42 T57 R130 Z52 B23

04  8 01 37 2025 -11.5  166.2 4.7 LATA SOLOMON ISLANDS           M76 T21 R136 Z35 B15

04  8 00 26 2025  33.5  -82.3 1.9 N OF HARLEM GEORGIA            M124 T102 R40 Z127 B123

04  8 00 01 2025  33.6  -82.3 1.8 WNW OF EVANS GEORGIA           M124 T102 R40 Z127 B123

04  7 23 40 2025  40.3 -124.6 2.8 W OF PETROLIA CA               M107 T75 R60 Z106 B89

04  7 23 29 2025  33.8 -116.1 2.6 NE OF COACHELLA CA             M116 T76 R60 Z106 B95

04  7 22 48 2025  50.5 -177.5 4.5 SSW OF ADAK ALASKA             M71 T70 R73 Z97 B62

04  7 22 44 2025  44.7 -111.9 2.2 NE OF SPENCER IDAHO            M108 T85 R50 Z116 B98

04  7 21 28 2025  -5.4  102.8 4.3 PAGAR ALAM INDONESIA           M28 T81 R120 Z67 B48

04  7 21 20 2025  49.2 -120.5 2.0 S OF PRINCETON CANADA          M102 T83 R52 Z114 B93

04  7 20 17 2025  38.8 -122.8 2.3 WNW OF COBB CA                 M109 T75 R60 Z106 B90

04  7 20 00 2025  -6.2  151.4 4.8 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  7 19 49 2025   2.0   96.8 5.8 SE OF SINABANG INDONESIA       M19 T90 R110 Z77 B55

04  7 17 20 2025  11.9  -87.6 4.4 SW OF CORINTO NICARAGUA        M146 T90 R59 Z109 B121

04  7 15 57 2025 -17.4 -178.7 4.4 ENE OF LEVUKA FIJI             M92 T5 R136 Z31 B31

04  7 15 28 2025  -6.4  151.5 5.0 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  7 15 02 2025 -23.9  179.2 4.5 THE FIJI ISLANDS               M92 T7 R142 Z25 B31

04  7 14 27 2025  -6.2  151.6 4.9 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  7 13 29 2025 -11.7  165.0 5.1 LATA SOLOMON ISLANDS           M75 T21 R136 Z34 B14

04  7 13 08 2025  -6.3  151.5 5.1 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  7 12 54 2025  18.9 -155.2 3.8 ESE OF NAALEHU HAWAII          M99 T43 R93 Z74 B57

04  7 12 35 2025  18.9 -155.2 3.0 ESE OF NAALEHU HAWAII          M99 T43 R93 Z74 B57

04  7 11 47 2025  40.0 -121.0 2.4 WNW OF PAXTON CA               M109 T77 R58 Z108 B91

04  7 10 38 2025  36.5 -114.0 3.5 S OF SCENIC ARIZONA            M115 T79 R57 Z109 B96

04  7 09 57 2025  18.8 -155.2 3.1 ESE OF NAALEHU HAWAII          M99 T42 R93 Z73 B57

04  7 09 52 2025  38.8 -122.8 2.4 THE GEYSERS CA                 M109 T75 R60 Z106 B90

04  7 08 48 2025  18.4  -67.4 3.3 RINCóN PUERTO RICO            M136 T111 R43 Z128 B139

04  7 07 24 2025  14.6  145.6 5.3 VILLAGE NORTHERN MARIANA ISLAN M47 T52 R112 Z63 B21

04  7 06 55 2025  -6.4  151.8 4.6 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z41 B0

04  7 06 26 2025  32.7   82.5 4.2 NNE OF BURANG CHINA            M15 T111 R77 Z108 B75

04  7 05 29 2025  31.7 -104.4 2.6 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04  7 05 02 2025  39.0 -119.0 3.1 KM ENE OF YERINGTON            M111 T78 R58 Z108 B93

04  7 04 19 2025  44.3 -115.2 2.1 WNW OF STANLEY IDAHO           M108 T83 R52 Z114 B96

04  7 03 36 2025  -1.8  120.5 4.3 SSW OF POSO INDONESIA          M33 T66 R124 Z59 B31

04  7 02 59 2025  49.4  155.5 5.4 SSW OF SEVERO-KURIL’SK RUSSI M53 T74 R78 Z96 B55

04  7 02 42 2025  37.4 -120.0 2.5 SSW OF MARIPOSA CA             M111 T76 R60 Z106 B92

04  7 02 39 2025  37.6 -113.1 2.3 ENE OF KANARRAVILLE UTAH       M114 T81 R56 Z110 B97

04  7 00 52 2025  35.9  140.8 4.6 N OF HASAKI JAPAN              M41 T70 R91 Z85 B42

04  7 00 35 2025  18.0  -66.8 3.2 INDIOS PUERTO RICO             M136 T111 R43 Z128 B140

04  7 00 18 2025  -5.6  133.8 4.6 E OF TUAL INDONESIA            M46 T52 R131 Z49 B17

04  7 00 11 2025  -6.4  130.4 4.3 WSW OF TUAL INDONESIA          M44 T55 R131 Z50 B21

 

 

April 7, 2025

 

An earthquake of M 3.7 was widely felt today in northwestern Washington State. NEIC reported intensity III in Federal Way, Enumclaw, Kent, North Bend,  Seattle, Everett, Monroe, Camano Island, Ashford, Buckley, Port Orchard, Randle, Olympia, Thorp, and Victoria, British Columbia, Canada. Intensity II was also felt in Washington at Auburn, Black Diamond, Carnation, Fall City, Issaquah, Maple Valley, Ravensdale, Renton, Snoqualmie, Sammamish, Woodinville, Bellingham, Granite Falls, Marysville, Oak Harbor, Skykomish, Sultan, Carbonado, Eatonville, Gig Harbor, Orting, Puyallup, Spanaway, Bonney Lake, Tacoma, Olympia, Shelton, Leavenworth and Cle Elum and as far as 125 km from the epicenter.

This is a significant regional earthquake. The strongest earthquake to hit

this area in the past 20 years was an M 4.3 on October 8, 2006. The last event within about 50-100 km

of this epicenter with M>=3.7 occurred on January 3, 2018 with M 3.9 and prior to that on August 23, 2013.

At the time this summary had noted:

 

"The largest earthquake in the U.S. or Canada today was an M 3.9 near Morton, Washington. This earthquake occurred within  minutes of local solar midnight and was probably

promoted by tidal stresses associated with the full moon which maximize at this hour. NEIC reported

this and aftershocks of M 2.5 and 2.4 were felt in the area with intensity II-III

at Morton, Glenoma, Toutle, Amboy, Ariel, Randle, Mineral, Yacolt, Kalama, Kelso, Woodland, Packwood, La Center, Battle Ground, Castle Rock, Washougal and within about 100 km of the epicenter in Washington State.

No major damages or casualties were reported with this event. The last earthquake

within about 100 km of this epicenter in Washington with M>=3.9 occurred as an

M 4.1 on November 16, 2010." (January 3, 2018)

 

Today's epicenter is at 103 degrees from the M 7.7 in Myanmar of March 28 and near

the fourth node from New Britain and may have been promoted by energy from those

sources. Possible seismic enhancement from Myanmar for this region of Washington

State had been noted in previous issues as:

 

"Earthquakes of M>=4.5 "have occurred in California or Nevada

in four of six occurrences of such an event in the Reykjanes Ridge with

several within 2-3 days (mostly at the sixth node (60 degrees) or the seventh node (52 degrees)

from the mainshocks in the Reykjanes area. These largest of these was the M 7.3 in December, 1954

in the Dixie Valley of Nevada which occurred 4-5 days after the North Atlantic

quake. The reason for this corresponding California activity may have to do

with the location of the North Atlantic events which lie near the Euler Pole

for North America and the Pacific Plates. This is the point around which the

North American plate appears to rotate with respect to the Pacific Plate.

A line perpendicular to local faults in California extended on a globe

will intersect other such lines at the Euler Pole. So energy emitted

at the Euler Pole will interact with faults in California as a pulse rather

than piece-meal. This simultaneity causes larger and more wide-spread

fault slippage especially in basin and range tectoniss as occur in

Nevada. With this in mind this summary is issuing a seismic watch for

the Pacific Plate-North American Plate and especially for vertical or strike-slip tectonics

regions for the next week extending from the Gulf of California to Washington

State with a moderate possibility of a moderate to strong quake in this time

period. A likely time for such event would be within a couple of days of the next full moon on April 13." (April 4, 6, 2025)

 

and

 

"P- and S- shadow zone edge and node 7 (101-110 degrees)

 

Myanmar to South of Africa, Washington, Oregon States, British Columbia, Alberta, Nunavit, Quebec, Eastern Canada, Montana, Central Mid-Atlantic, Northern,  Kermadec Islands, Hawaii " (March 28, 2025)

 

The earthquake in Washington State occurred at the height of the current

geomagnetic storm which has been active since April 2. High latitude A for

this storm was 36 today and peaked with Kp 6 mid-day UT.

 

 

The strongest earthquake in the world today was an M 5.4 in the northern Kuril Islands. NEIC did not report it felt in this remote area.

 

A moderate earthquake of M 5.4 was also recorded in the Arctic Ocean north of Severnaya Zenlya, Russia today.

It was not reported felt in this remote area. This earthquake may have

been triggered by SFE from solar flare 4660 which was first observed

two minutes before the earthquake occurred. Data on this flare and earthquake

from SWPC follow.

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

4660       1035   1041      1043   C1.9      (April 6, 2025)   1.2E-03  

Arctic Ocean M 5.4 10:37 UT

 

 

A moderate M 5.3 hit the northern Marianas Islands north of Guam today. NEIC reported it was felt with maximum intensity IV in the Northern Marianas at Gualo Rai and Garapan, Saipan and in Tinian with III and with III in Guam at Tamuning and Santa Rita.

 

Moderate earthquakes also continued today as aftershocks in New Britain. The larger

of these around M 5.2 were probably felt in Kimbe and Port Moresby with light intensity.

 

NEIC reported an earthquake of M 3.3 in Western Arizona was felt with  intensity up to II-III in the area(s) of Western Arizona at Las Vegas, Nevada.

 

NEIC reported an earthquake of M 3.1 in Western Nevada was felt with  intensity up to II-III in the area(s) of Western Nevada at Yerington, Nevada with intensity V.

 

NEIC reported an earthquake of M 2.5 in Central California may have been felt with  intensity up to II-III in the area(s) of  Mariposa, California.

 

NEIC reported an earthquake of M 4.1 in Northern South Island, New Zealand was felt with  intensity up to II-III in the area(s) of Northern South Island, New Zealand in Blenheim, Marlborough and Nelson.

 

GeoNet reported the following parameters for this earthquake:

 

O: 06APR2025 21:49:03 41.6S 173.3E MB=5.1  GEONET 413 people reported feeling this earthquake with 286 at weak intensity and 109 with light shaking and 17 with moderate intensity 0 with strong, 0 with severe and 1 with extreme intensity.

 

NEIC reported an earthquake of M 4.9 in Greece was felt with  intensity up to II-III in the area(s) of Greece with V at Kalavrita and Akrata, Ahaia.

 

 

NEIC reported an earthquake of M 4.1 in the Cayman Islands was felt with  intensity up to II-III in the area(s) of the Cayman Islands at East End with intensity V; in Grand Cayman at George Town with IV and in West Bay with III.

 

 

NEIC reported an earthquake of M 4.5 in Taupo, New Zealand was felt with  intensity up to II-III in the area(s) of Taupo, New Zealand with II in Auckland and in the Bay of Plenty area at Whakatane and in Napier, Hawke's Bay.

 

GeoNet reported the following parameters for this earthquake:

 

O: 06APR2025 10:57:08 38.1S 176.5E ML=4.8  GEONET 205 people reported feeling this earthquake with 174 at weak intensity and 29 with light shaking and 2 with moderate intensity 0 with strong, 0 with severe and 0 with extreme intensity.

 

GeoNet also reported the following parameters for an earthquake in Cook Strait, New Zealand today:

 

O: 06MAR2025 12:16:01 41.1S 175.1E ML=4.2  GEONET Felt with moderate to strong intensity in the area southeast of Picton, New Zealand and in southern North Island and northern South Island. 3940 reports of felt events were made of which 2039 reported weak and 1673 light intensity with 211 report of moderate shaking and 15 with strong and 1 severe and 1 with extreme intensity came from the area.

 

No tropical cyclones are currently active

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

4660       1035   1041      1043   C1.9      (April 6, 2025)   1.2E-03  

Arctic Ocean M 5.4 10:37 UT

 

4690       1546   1553      1605   C2.9      (April 6, 2025)   3.1E-03  

4720       1741   1744      1747   C2.0      (April 6, 2025)   8.2E-04  

4740       1947   1957      2006   C2.3      (April 6, 2025)   2.4E-03  

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  active April 7-8 unsettled April 9.  Solar M-flare chance: 55% X-class: 10% proton storm: 1%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    20 36 17 09:00 6  160 167

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and earthquakes during the past day as reported by NEIC (colored circles).

 

 

NODAL EARTHQUAKES LIKELY ASSOCIATED WITH REYKJANES RIDGE

 

Following are expected (and observed locations following the February, 2015 quake) of

far-field seismic enhancment at nodal distances from the M 6.9 in the Reykjanes

Ridge of April 3, 2025.

 

Antipodal (~180 degrees)

North Atlantic to Macquarie Islands, 

 

Outer shadow zone edge (141-148 degrees)

North Atlantic to Vanuatu, Kermadec Islands, 

 

Node 3 (120 degrees)

North Atlantic to Sumatra, Molucca, Talaud, Halmahera, 

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

North Atlantic to Aisen, Chile, Andaman Is. Taiwan, South Sandwich Islands, Volcano Islands, Honshu, Japan, 

 

Node 4 (90 degrees)

North Atlantic to Honshu, Japan, Central Chile, 

 

Node 5 (72 degrees)

North Atlantic to northern Peru, Pakistan, Andreanof Islands, Southern Mid-Atlantic, Northeast Pacific Rise, Peru,  

 

Node 6 (60 degrees)

North Atlantic to Nicaragua, Guatemala, Southern California, Alaska, Colombia, Central Mid-Atlantic, Mexico, Nevada, California, Costa Rica, 

 

Node 7 (52 degrees)

North Atlantic to Central Mid-Atlantic, Colorado, Texas, Idaho, Montana, Washington, British Columbia

 

 

DISTANCE RELATIONS FROM NEW BRITAIN

 

Antipodal (~180 degrees)

 

New Britain to Central Mid-Atlantic,

 

Outer shadow zone edge (141-148 degrees)

 

New Britain to Dominican Republic, Haiti, Puerto Rico,  Gibraltar,

 

Node 8 (135 degrees)

 

New Britain to Reykjanes Ridge, northern Chile, Peru, France,

 

 

Node 3 (120 degrees)

 

New Britain to Quebec, Guatemala, El Salavador, Dodecanese Islands, Nicaragua, Central Chile, Greece

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

 

New Britain to Iran, Greenland Sea, Svalbard, Western Texas, East Pacific Rise,  Alamosa, Colorado, Kansas, Baffin Bay, Iran, Michoacan, Jalisco, Mexico,  Greenland Sea, Mayotte, Southern Colorado, Iran, Gulf of Aden, Caucasus, Arctic Ocean, Idaho, Montana, Nevada, Oklahoma,

 

Node 4 (90 degrees)

 

New Britain to Coast of No. California, Nevada, Central, Southern California, Afghanistan, 

 

Node 5 (72 degrees)

 

New Britain to Alaska Peninsula, Fox Islands, 

 

Node 6 (60 degrees)

 

New Britain to Komandorsky Is, Nicobar Islands, India, Hawaii, Andreanof Is, Kamchatka, Myanmar, South of New Zealand, 

 

Node 7 (52 degrees)

 

New Britain to Sumatra, Honshu, Japan, 

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.5 during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS).

Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

 

04  7 11 47 2025  40.0 -121.0 2.4 WNW OF PAXTON CA               M109 T77 R58 Z108 B91

04  7 10 38 2025  36.5 -114.0 3.3 KM S OF SCENIC                 M115 T79 R57 Z109 B96

04  7 09 52 2025  38.8 -122.8 2.4 THE GEYSERS CA                 M109 T75 R60 Z106 B90

04  7 08 48 2025  18.4  -67.4 3.3 RINCóN PUERTO RICO            M136 T111 R43 Z128 B139

04  7 07 24 2025  14.6  145.6 5.3 VILLAGE NORTHERN MARIANA ISLAN M47 T52 R112 Z63 B21

04  7 06 55 2025  -6.4  151.8 4.6 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z41 B0

04  7 06 26 2025  32.7   82.5 4.2 NNE OF BURANG CHINA            M15 T111 R77 Z108 B75

04  7 05 29 2025  31.6 -104.3 2.8 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B105

04  7 05 28 2025  31.6 -104.3 2.2 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B105

04  7 05 02 2025  39.0 -119.0 3.1 KM ENE OF YERINGTON            M111 T78 R58 Z108 B93

04  7 03 36 2025  -1.8  120.5 4.3 SSW OF POSO INDONESIA          M33 T66 R124 Z59 B31

04  7 02 59 2025  49.4  155.5 5.4 SSW OF SEVERO-KURIL’SK RUSSI M53 T74 R78 Z96 B55

04  7 02 42 2025  37.4 -120.0 2.5 SSW OF MARIPOSA CA             M111 T76 R60 Z106 B92

04  7 02 39 2025  37.6 -113.1 2.4 ENE OF KANARRAVILLE UTAH       M114 T81 R56 Z110 B97

04  7 00 52 2025  35.9  140.8 4.6 N OF HASAKI JAPAN              M41 T70 R91 Z85 B42

04  7 00 35 2025  18.0  -66.8 3.2 INDIOS PUERTO RICO             M136 T111 R43 Z128 B140

04  7 00 18 2025  -5.6  133.8 4.6 E OF TUAL INDONESIA            M46 T52 R131 Z49 B17

04  7 00 11 2025  -6.4  130.4 4.3 WSW OF TUAL INDONESIA          M44 T55 R131 Z50 B21

04  6 23 47 2025  32.1 -101.5 2.5 W OF FORSAN TEXAS              M123 T86 R53 Z114 B107

04  6 22 44 2025  38.9   70.9 4.0 ESE OF RASHT TAJIKISTAN        M27 T121 R67 Z120 B86

04  6 22 00 2025 -10.5  162.4 4.6 KIRAKIRA SOLOMON ISLANDS       M72 T24 R136 Z36 B11

04  6 22 00 2025  39.1 -119.0 2.1 KM ENE OF YERINGTON            M111 T78 R58 Z108 B93

04  6 21 49 2025 -41.6  173.3 4.1 WAIRAU VALLEY NEW ZEALAND      M95 T23 R159 Z7 B40

04  6 21 14 2025  -6.2  151.6 4.6 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  6 19 30 2025  -6.1  151.7 4.5 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  6 19 02 2025  38.2 -118.7 2.1 KM SSW OF HAWTHORNE            M111 T77 R58 Z108 B93

04  6 18 44 2025  38.1   22.0 4.9 WNW OF KALáVRYTA GREECE       M64 T157 R39 Z152 B124

04  6 18 15 2025 -58.7  -23.8 4.9 SOUTH SANDWICH ISLANDS REGION" M123 T97 R111 Z74 B115

04  6 15 16 2025  -6.3  151.6 4.6 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  6 15 15 2025  47.2 -121.5 3.7 E OF GREENWATER WASHINGTON     M103 T82 R54 Z112 B92

04  6 15 11 2025  -6.3  151.5 4.8 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  6 14 41 2025  19.0  -80.5 4.1 EAST END CAYMAN ISLANDS        M139 T99 R50 Z119 B127

04  6 12 40 2025  19.0  -65.2 3.0 AMALIE U.S. VIRGIN ISLANDS     M135 T113 R42 Z130 B141

04  6 12 02 2025  39.5 -119.5 2.4 KM NW OF STAGECOACH            M110 T78 R58 Z108 B92

04  6 12 00 2025  36.6 -121.2 2.0 NNW OF PINNACLES CA            M112 T75 R61 Z105 B91

04  6 11 59 2025  11.8  -87.5 4.9 SSW OF CORINTO NICARAGUA       M146 T90 R60 Z109 B121

04  6 10 57 2025 -38.2  176.4 4.5 OHINEMUTU NEW ZEALAND          M96 T19 R155 Z11 B39

04  6 10 36 2025  83.5  113.6 5.4 NORTH OF SEVERNAYA ZEMLYA"     M61 T108 R42 Z132 B90

04  6 10 02 2025  -6.2  151.8 5.2 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  6 09 22 2025  39.5 -119.5 3.3 NEVADA                         M110 T78 R58 Z108 B92

04  6 06 55 2025  -7.9  106.0 4.9 SSW OF PELABUHANRATU INDONESIA M31 T78 R123 Z63 B45

04  6 06 51 2025  -6.4  151.6 4.2 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  6 06 47 2025  27.4   53.1 4.3 SE OF MOHR IRAN                M39 T136 R65 Z124 B100

04  6 06 29 2025 -21.6  170.5 4.9 SSE OF ISANGEL VANUATU         M84 T14 R144 Z25 B23

04  6 06 11 2025  36.0 -120.6 3.3 NW OF PARKFIELD CA             M112 T75 R61 Z105 B91

04  6 05 58 2025  38.8 -122.8 2.6 WNW OF COBB CA                 M109 T75 R60 Z106 B90

04  6 04 36 2025  -6.4  151.4 4.5 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  6 04 19 2025   3.4  127.2 4.6 NNW OF TOBELO INDONESIA        M35 T62 R121 Z60 B26

04  6 04 00 2025  18.6  -68.8 3.9 DE HIGüEY DOMINICAN REPUBLIC  M136 T109 R44 Z127 B138

04  6 03 58 2025  18.4  -65.8 3.1 HATO CANDAL PUERTO RICO        M136 T112 R43 Z129 B141

04  6 03 20 2025  31.8   51.0 4.6 WSW OF BORÅ«JEN IRAN           M40 T138 R61 Z128 B102

04  6 03 14 2025  31.7 -104.4 3.0 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04  6 03 14 2025  -6.2  151.4 4.4 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  6 02 57 2025  40.4 -126.1 2.7 W OF FERNDALE CALIFORNIA       M106 T74 R61 Z105 B87

04  6 02 03 2025  41.6   44.7 2.9 S OF KOJORI GEORGIA            M46 T141 R51 Z138 B106

04  6 01 36 2025  -6.3  151.5 4.5 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

 

 

April 5, 2025

 

A major earthquake of M 6.9-7.0 hit the area of New Britain and New Guinea today.

Several moderate foreshocks have hit the region since the solar eclipse of

March 29, some of which appear to have been promoted by SFE associated

with solar flares and geomagnetic storms of the past several days. A series of

moderate earthquakes of M>=5 were also felt in the Kimbe area of New Guinea. These

foreshock occurrences may have provided fore-warning of strong stress build up in the region.

NEIC reported today's event of M 6.9 in New Britain/New Guinea was felt with

intensity V in New Britain at Kokopo and Kimbe; III in Papua New Guinea at

Port Moresby and Paguna. This is the strongest earthquake within about 250

km of today's epicenter since an M 7.5 on May 14, 2019 and an M 7.0 on October 10, 2018.

at the time this summary noted:

 

 

"The earthquakes in New Britain were reported felt with intensity IV in Kimbe, New Britain and II in Kokopo, East New Britain, PNG.

Little damage was reported with this series. The last earthquake of M>=7 in New Britain

was a similar M 7.0 on March 29, 2018 within about 50 km of today's epicenter.

The last of larger magnitude within about 200 km of this epicenter was an

M 7.5 on May 5, 2015. An M 7.9 about 250 km to the northeast occurred on December 17, 2016.

... New Britain is near the geomagnetic equator as was probably

promoted by the current geomagnetic storm. These earthquakes are also at the

third node from the landfall of Hurricane Michael (120 degrees). Earthquake motions

associated with landfall could enhance seismicity at distances similar

to those associated with strong earthquakes and other energetic surficial phenomena.

The two events - landfall and earthquakes occurred simultaneously." (October 10, 2018)

 

and

 

"The strongest earthquake in the world today was an M 7.5-7.7 in the New Britain

region of Papua New Guinea. NEIC reported it was felt with maximum intensity VII

in Rabaul, New Britain and VI in Kokopo; V in Namatanai, New Ireland; IV in Arawa, Solomon Islands and II-III in Kavleng, New Ireland and within about 500 km of the epicenter.

It was also reported felt with moderate to strong intensity in Port Vila, Lihir Island, Bougainville, Port Moresby with power blackouts in the

Kokopo area. PTWC issued a tsunami warning but this was later withdrawn. Villagers

near the epicenter on the west coast of New Ireland reported seeing the ocean

recede bu no damaging waves were recorded. Damage did occur in New Britain but

immediate reports are unclear as to how great it was. This is the strongest

earthquake in the world during the year 2019 to date. An M 7.5 hit the region of Ecuador

on February 22, 2019, the largest previous during this year. This earthquake

was simultaneous with the strongest geomagnetic storm since August 26, 2018 when AP reached 76.

 

...

 

The last earthquake of M>=7.5 in the region of New Britain within about 400 km

of today's epicenter was an M 7.9 on December 17, 2016 and prior to that an M 7.8 on November 16 and 17, 2000.

 

Readers of this summary should not be surprised by the relation between the

geomagnetic storm today and the earthquake in New Guinea. On May 7, two major C-class

solar flares, which probably led to today's geomagnetic storm, occurred in

conjunction with an M 7.2 in New Guinea. At the time this summary noted:

 

"A major earthquake of M 7.2 hit the region of eastern New Guinea today. NEIC reported maximum intensity VII in Papua New Guinea at Wau Morobe and VI in Bulolo, Lae, Kainantu and Goroka,  Eastern Highlands, and V in Mount Hagen, Western Highlands, PNG and lesser shaking within about 300 km of the epicenter including at Lalibu, Madang, Kundiawa and Kerema, PNG.

This is the largest earthquake in the world since an M 7.5 in Ecuador on February 22, 2019

and one of only two such events during the year 2019. It occurred at an intermediate

depth of 141 km reducing surface effects. The M 7.2 is the strongest earthquake

within about 200 km of this epicenter in at least 30 years although an M 7.2

on May 15, 1992 and a similar M 7.2 on December 22, 1997 occurred just outside this

distance range. The last in the 200 km range was an M 7.6 on February 8, 1987. Similar

events occurred in February 1963; February, 1951; January, 1946; May, 1938 and February, 2007.

 

This event in New Guinea was probably promoted by a pair of strong C-class solar

flares. This summary had noted these as:

 

"Solar flare activity today included a C9.9 and a C7.3 flare, the strongest

recorded in the current year. The second of these occurred while New Guinea

was directly anti-solar and probably helped promote the later M 7.2 in that

area today. This flare activity is likely to increase and enhance seismicity along

the geomagnetic equator in the next five days." (May 6-7, 2019)" (May 7, 2019)

 

When a moderate earthquake of M 5.3 in New Britain occurred yesterday, this report

noted:

 

"The strongest earthquake in the world today was an M 5.3 in the region of New

Britain. This epicenter is located near the geomagnetic equator and may have

been promoted by the geomagnetic storm. It occurred near local solar midnight

a time when geomagnetic effects are maximized. Further such seismicity including

the possibility of a strong regional event is likely in the next several days." (May 13-14, 2019)

 

Another factor which probably led to enhanced seismicity in New Britain at this

time was the passage of Tropical Cyclone Ann to the south of this epicenter at

the time of the M 7.5-7.7 event. This summary had noted this possibility in

previous issues as:

 

"Tropical Cyclone Ann (27P) continued today in the area south of New Guinea with winds up to 45 kts.

It is expected track to the west over the next several days. Some seismic enhancement in the region of

New Guinea and the Solomon Islands is possible at this time." (May 13-14, 2019)

(May 14, 2019)

 

 

This earthquake in New Britain occurred at 60 degrees (node 6) from Myanmar M 7.7 of March 28 and at the

10th node (36 degrees) from the M 7.1 in Tonga of March 30, 2025. It is also at

the eighth node (135 degrees) from the M 6.9 in the Reykjanes Ridge which

occurred on April 3. Finally it is located in the antipodal region (within about

5 degrees) of the M 6.6  in the Central Mid-Atlantic earthquake of March 28, 2025

and may have been promoted by energy from all these sources.

 

 

A tsunami warning was issued by PTWC but was later cancelled when no damaging

waves were observed with this earthquake.

 

Today's earthquake in New Britain occurred at the maximum of a geomagnetic

strom which reached planetary and low latitude Kp of 5.33 at the time of the storm. It may

have been promoted by energy from that storm, which continued from the previous day.

Strong aurorae are expected with this geomagnetic storm. In the previous issue of this summary the coincidence of the main part of this

storm with the Reykjanes Ridge (M 6.9) quake had been similarly noted as:

 

"The mainshock (in Reykjanes Ridge) occurred within a couple of minutes of local solar noon and

was probably promoted by tidal and/or geomagnetic stresses which maximize

near this hour. The mainshock was coincident with the peak of a strong

geomagnetic storm which reached Kp of 6 at high latitudes at the time of

the mainshock and could have triggered it." (April 4, 2025)

 

An M 5.2 preceded the M 6.9 in New Britain several hours earlier in Eastern New Guinea. NEIC reported it was felt with intensity III in Goroka, Eastern Highlands, New Guinea.

 

Due to its distance from Tonga (45 degrees) and Myanmar (60 degrees) the region

of New Guinea and New Britain had been singled out as an area of possibly

significant seismic enhancement at this time as noted in previous issues of

this summary:

 

 

"Node 7 (52 degrees)

 

Tonga to East Pacific Rise, South of Australia, Western Australia, New Guinea, Mariana Is, " (April 1-4, 2025)

 

and

 

 

"Node 6 (60 degrees)

 

Myanmar to Western Turkey, Ukraine, SW Australia, Kamchatka/Komandorsky Is, Crete, Greece, New Guinea, New Britain, " (April 1-4, 2025)

 

Forecast 171088 had expected a possibly strong earthquake in this area was

likely around April 2, 2025. Following are the forecast an epicentral data

for this quake.

 

 

O: 04APR2025 20:04:38  6.2S 151.8E ML=6.9  NEIC   New Britain/New Guinea

P: 02APR2025 171088    4.0S 151.0E 4.0-6.0 ACAAA  New Ireland    

 

A set of three light earthquakes occurred east of San Francisco, California today.

The largest of these was M 3.1.  The M 3.1 also occurred in Central California shortly before the M 4.0 in the Geysers

today (see above). NEIC reported it was felt with intensity III in Hollister, Salinas, San Juan Bautista with lesser shaking as far as Oakland, California.

This epicenter is also at the sixth node from the Reykjanes Ridge. These

epicenters are also at 90 degrees (node 4) from the M 6.9 in New Britain today

and may represent a site of further and stronger activity in the next several days.

 

EMSC reported an earthquake of M 4.7 in Myanmar was felt with  intensity up to II-III in the area(s) of Myanmar at Kyaukse, Sintgaing, Mandalay, Patheingyi, Pyinoolwin, Meiktila, Taunggyi.

 

EMSC reported earthquakes of M M 4.9 and M 4.7 in Nepal were felt with  intensity up to IV in the area(s) of Nepal at Kathmandu, and in India at Sitarganj, Ayodhya, Almora, Hasanganj, Moradabad.

 

No tropical cyclones are currently active

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

4060       0727   0734      0737   C1.8      (April 4, 2025)   1.0E-03   

Samoa M 4.5 08:00 UT

 

4090       1007   1024      1049   C3.3      (April 4, 2025)   7.2E-03  

Baja California M 4.5 10:25 UT

Antofagasta M 4.5 10:35 UT

 

4110       1324   1328      1332   C2.2      (April 4, 2025)   1.0E-03  

4130       1434   1446      1453   C4.4      (April 4, 2025)   3.7E-03  

No. California M 2.2 14:35 UT

SE Alaska M 3.5 14:36 UT

 

4250       2324   2338      2354   C5.7      (April 4, 2025)   7.8E-03  

New Britain M 4.6 23:20 UT M 4.9 23:46 UT

 

Western Xizang M 4.4 23:38 UT

 

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  minor storms April 5 active April 6 unsettled April 7.  Solar M-flare chance: 65% X-class: 15% proton storm: 10%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    33 44 19 17:00 6  124 180

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 6.9 in New Britain (Green stipples) of

April 4, 2025 and earthquakes during the past day as reported by NEIC (colored circles).

 

 

NODAL EARTHQUAKES LIKELY ASSOCIATED WITH REYKJANES RIDGE

 

Following are expected (and observed locations following the February, 2015 quake) of

far-field seismic enhancment at nodal distances from the M 6.9 in the Reykjanes

Ridge of April 3, 2025.

 

Antipodal (~180 degrees)

North Atlantic to Macquarie Islands, 

 

Outer shadow zone edge (141-148 degrees)

North Atlantic to Vanuatu, Kermadec Islands, 

 

Node 3 (120 degrees)

North Atlantic to Sumatra, Molucca, Talaud, Halmahera, 

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

North Atlantic to Aisen, Chile, Andaman Is. Taiwan, South Sandwich Islands, Volcano Islands, Honshu, Japan, 

 

Node 4 (90 degrees)

North Atlantic to Honshu, Japan, Central Chile, 

 

Node 5 (72 degrees)

North Atlantic to northern Peru, Pakistan, Andreanof Islands, Southern Mid-Atlantic, Northeast Pacific Rise, Peru,  

 

Node 6 (60 degrees)

North Atlantic to Nicaragua, Guatemala, Southern California, Alaska, Colombia, Central Mid-Atlantic, Mexico, Nevada, California, Costa Rica, 

 

Node 7 (52 degrees)

North Atlantic to Central Mid-Atlantic, Colorado, Texas, Idaho, Montana, Washington, British Columbia

 

 

DISTANCE RELATIONS FROM NEW BRITAIN

 

Antipodal (~180 degrees)

 

New Britain to Central Mid-Atlantic,

 

Outer shadow zone edge (141-148 degrees)

 

New Britain to Dominican Republic, Haiti, Puerto Rico,  Gibraltar,

 

Node 8 (135 degrees)

 

New Britain to Reykjanes Ridge, northern Chile, Peru, France,

 

 

Node 3 (120 degrees)

 

New Britain to Quebec, Guatemala, El Salavador, Dodecanese Islands, Nicaragua, Central Chile, Greece

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

 

New Britain to Iran, Greenland Sea, Svalbard, Western Texas, East Pacific Rise,  Alamosa, Colorado, Kansas, Baffin Bay, Iran, Michoacan, Jalisco, Mexico,  Greenland Sea, Mayotte, Southern Colorado, Iran, Gulf of Aden, Caucasus, Arctic Ocean, Idaho, Montana, Nevada, Oklahoma,

 

Node 4 (90 degrees)

 

New Britain to Coast of No. California, Nevada, Central, Southern California, Afghanistan, 

 

Node 5 (72 degrees)

 

New Britain to Alaska Peninsula, Fox Islands, 

 

Node 6 (60 degrees)

 

New Britain to Komandorsky Is, Nicobar Islands, India, Hawaii, Andreanof Is, Kamchatka, Myanmar, South of New Zealand, 

 

Node 7 (52 degrees)

 

New Britain to Sumatra, Honshu, Japan, 

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.5 during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for New Zealand (ZDIS), New Britain (BDIS) Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS).

Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04  5 08 46 2025  32.4 -116.8 2.0 PRIMO TAPIA B.C. MX            M117 T75 R61 Z104 B94

04  5 07 57 2025  52.5  -32.1 5.5 REYKJANES RIDGE"               M93 T136 R0 Z166 B133

04  5 05 53 2025  38.9 -117.7 2.2 KM ENE OF GABBS                M111 T78 R57 Z109 B94

04  5 05 41 2025  31.6 -104.0 2.3 NNW OF TOYAH TEXAS             M123 T84 R54 Z112 B105

04  5 05 07 2025  -6.3  151.5 5.1 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  5 04 40 2025  31.5 -104.0 2.1 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  5 04 09 2025  32.2 -101.8 2.8 N OF STANTON TEXAS             M123 T86 R53 Z114 B107

04  5 04 06 2025  43.7  -74.1 1.7 NORTH CREEK NEW YORK           M113 T110 R29 Z138 B125

04  5 03 18 2025  18.0  -66.9 3.1 GUáNICA PUERTO RICO           M136 T111 R44 Z128 B140

04  5 01 57 2025 -22.0 -173.8 5.0 ESE OF ‘OHONUA TONGA         M98 T1 R137 Z29 B36

04  5 01 36 2025  31.7 -104.2 2.2 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  5 01 28 2025  31.5 -104.0 2.3 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  5 01 22 2025  31.7 -104.3 3.1 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

04  5 01 22 2025  31.7 -104.3 2.6 WHITES CITY NEW MEXICO         M123 T84 R54 Z112 B105

04  5 01 07 2025  -6.4  151.7 4.9 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z41 B0

04  5 00 57 2025  -6.2  151.6 5.1 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  5 00 55 2025  -6.3  151.7 5.1 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  5 00 21 2025  -6.3  151.8 4.6 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  5 00 18 2025  31.5 -104.0 2.0 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  4 23 46 2025  -6.2  151.4 4.9 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  4 23 20 2025  -6.2  151.4 4.6 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  4 22 27 2025  -6.3  151.6 5.1 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  4 22 02 2025  -6.2  151.7 5.2 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  4 21 56 2025  -6.2  151.6 5.0 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  4 21 46 2025  -6.2  151.6 5.1 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  4 21 38 2025  -6.5  151.4 4.9 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z41 B0

04  4 21 32 2025  -6.3  151.7 4.9 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  4 21 29 2025  -6.4  151.5 4.9 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  4 21 14 2025  -6.2  151.5 5.1 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  4 21 12 2025  41.0  141.8 4.6 E OF YOKOHAMA JAPAN            M42 T73 R86 Z89 B47

04  4 20 39 2025  -6.4  151.6 5.3 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  4 20 27 2025  38.8 -122.9 2.3 THE GEYSERS CA                 M109 T75 R60 Z106 B90

04  4 20 04 2025  -6.2  151.8 6.9 KIMBE PAPUA NEW GUINEA         M61 T36 R133 Z42 B0

04  4 20 04 2025  -6.2  151.6 7.1 NEW BRITAIN                    M61 T36 R133 Z42 B0

04  4 19 15 2025  41.3  140.2 4.6 WNW OF IMABETSU JAPAN          M41 T74 R86 Z90 B48

04  4 16 17 2025 -24.4 -180.0 4.1 THE FIJI ISLANDS               M93 T6 R142 Z24 B32

04  4 15 49 2025  52.6  -31.5 4.4 NORTHERN MID-ATLANTIC RIDGE"   M92 T136 R0 Z167 B133

04  4 15 37 2025  38.1 -121.8 3.1 NNE OF PITTSBURG CA            M110 T75 R60 Z106 B90

04  4 15 25 2025  21.6   96.1 4.7 KYAUKSE BURMA (MYANMAR)        M0 T97 R93 Z92 B60

04  4 15 16 2025  38.1 -121.8 2.3 NNE OF PITTSBURG CA            M110 T75 R60 Z106 B90

04  4 14 36 2025  58.3 -136.9 3.3 34 KM WNW OF                   M88 T84 R53 Z114 B85

04  4 14 34 2025  38.1 -121.8 2.2 NNE OF PITTSBURG CA            M110 T75 R60 Z106 B90

04  4 14 22 2025  29.0   82.0 4.9 ENE OF DAILEKH NEPAL           M14 T111 R80 Z106 B75

04  4 13 41 2025  31.6 -103.9 2.3 NNW OF TOYAH TEXAS             M123 T84 R54 Z112 B105

04  4 13 12 2025  24.1  121.6 4.0 HUALIEN CITY TAIWAN            M23 T76 R100 Z81 B41

04  4 12 41 2025 -20.3 -172.4 4.8 ESE OF FANGALE’OUNGA TONGA   M98 T1 R135 Z31 B37

04  4 11 58 2025  31.6 -104.0 2.7 NNW OF TOYAH TEXAS             M123 T84 R54 Z112 B105

04  4 11 17 2025  31.7 -104.4 2.8 WHITES CITY NEW MEXICO         M123 T84 R55 Z112 B104

04  4 11 15 2025  31.6 -104.1 2.2 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  4 11 07 2025  -0.5   99.6 4.7 W OF PARIAMAN INDONESIA        M22 T86 R114 Z73 B52

04  4 10 51 2025  -5.7  145.7 5.2 MADANG PAPUA NEW GUINEA        M55 T41 R133 Z44 B5

04  4 10 35 2025 -21.7  -68.7 4.4 SW OF OLLAGüE CHILE           M165 T95 R80 Z95 B131

04  4 09 44 2025  35.7  -97.4 2.1 KM W OF ARCADIA                M121 T91 R48 Z119 B110

04  4 09 39 2025   9.5  126.3 4.4 NNE OF CORTES PHILIPPINES      M31 T65 R115 Z66 B29

04  4 09 38 2025  52.1 -170.0 3.9 FOX ISLANDS, ALASKA            M75 T72 R69 Z100 B66

04  4 09 23 2025  31.5 -104.0 2.6 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  4 09 10 2025  35.7  -97.4 2.8 KM W OF ARCADIA                M121 T91 R48 Z119 B110

04  4 09 04 2025  35.7  -97.4 2.9 KM W OF ARCADIA                M121 T91 R48 Z119 B110

04  4 08 44 2025  36.2  -89.4 2.7 SSE OF RIDGELY TENNESSEE       M121 T97 R42 Z124 B116

04  4 08 31 2025   4.0  -82.6 4.8 SOUTH OF PANAMA                M154 T92 R63 Z107 B125

04  4 08 17 2025  -2.8  141.3 4.6 VANIMO PAPUA NEW GUINEA        M50 T47 R129 Z48 B10

04  4 08 01 2025 -15.5 -174.5 5.7 WNW OF HIHIFO TONGA            M95 T4 R132 Z35 B34

04  4 08 00 2025 -15.5 -174.6 4.5 WNW OF HIHIFO TONGA            M95 T4 R132 Z35 B34

04  4 07 18 2025  -1.9  135.7 4.4 SSW OF BIAK INDONESIA          M45 T52 R128 Z51 B16

04  4 06 59 2025  -7.9  109.1 4.7 SSE OF CILACAP INDONESIA       M32 T75 R125 Z61 B42

04  4 06 51 2025  31.5 -104.0 2.1 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  4 06 49 2025  31.7 -104.2 2.3 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  4 06 37 2025  31.5 -104.0 1.8 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  4 06 33 2025  31.5 -104.0 2.5 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  4 06 31 2025  38.8 -122.8 3.9 NW OF THE GEYSERS              M109 T75 R60 Z106 B90

04  4 06 14 2025  31.7 -104.2 2.5 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  4 04 23 2025  36.8 -121.4 3.1 S OF RIDGEMARK CA              M111 T75 R61 Z105 B91

04  4 03 44 2025  29.4   52.8 4.4 NNE OF AKBARāBāD IRAN        M39 T136 R64 Z126 B100

04  4 03 28 2025  36.8 -121.3 2.1 TRES PINOS CA                  M111 T75 R61 Z105 B91

04  4 03 07 2025 -21.2  -68.7 4.3 W OF OLLAGüE CHILE            M165 T96 R80 Z96 B132

04  4 02 36 2025  37.4 -114.3 2.6 KM SE OF CALIENTE              M114 T80 R56 Z109 B96

04  4 02 34 2025  45.5  145.5 4.7 N OF OTRADA RUSSIA             M46 T75 R82 Z93 B51

04  4 02 33 2025 -22.2 -179.5 4.5 THE FIJI ISLANDS               M93 T5 R140 Z27 B32

04  4 01 37 2025 -16.3  -72.5 4.8 EL PEDREGAL PERU               M167 T94 R77 Z98 B130

04  4 01 28 2025  31.5 -104.0 2.4 NW OF TOYAH TEXAS              M123 T84 R54 Z112 B105

04  4 01 01 2025  18.0  -68.3 3.4 DE YUMA DOMINICAN REPUBLIC     M137 T110 R44 Z127 B139

04  4 00 33 2025 -23.7 -179.9 4.6 THE FIJI ISLANDS               M93 T6 R142 Z25 B32

 

 

April 4, 2025

 

A major earthquake occurred today in the Reykjanes Ridge area of the North Atlantic Ridge with M 6.9.

The mainshock was followed by an M 5.4 aftershock about 150 km to the west.

EMSC reported it was felt in Ramsey, Isle of Man as a banging noise and a slight vibration.

The mainshock occurred within a couple of minutes of local solar noon and

was probably promoted by tidal and/or geomagnetic stresses which maximize

near this hour. The mainshock was coincident with the peak of a strong

geomagnetic storm which reachedKp of 6 at high latitudes at the time of

the mainshock and could have triggered it.

While a tsunami is a possibility with an oceanic event of this magnitude,

it is likely (should it occur) to be minor and non-destructive.

Only one earthquake has occurred in the Reykjanes Ridge with equal or greater

magnitude - an M 7.1 ten year ago on February 13, 2015. At the time this summary noted:

 

 

"A major earthquake of M 6.8-7.1 hit the Northern Mid-Atlantic Ridge today. NEIC reported

this quake may have been felt as far as 2000 km from the epicenter in Kilbirnie, Scotland, U.K.

This earthquake was preceded and followed by a series of foreshocks and aftershocks.

Some of these aftershocks occurred at great distance, such as an M 6.2 at 102 degrees

away in Taiwan which occurred about an hour later. Another strong series likely

triggered by this North Atlantic quake occurred several hours later at the sixth

node (60 degrees) from that epicenter in the region of Nevada near the Nevada-California

area. This sequence began with an M 3.2 and included an M 4.7 event and many

foreshocks and aftershocks. A contributing seismic promoter of this activity

may have been a strong Gamma Ray Burst. While this GRB was first noted by the

Swift Mission at 22:31 UT, past observations suggest that other related effects

such as proposed gravitational waves may influence seismicity several hours

before first observation. This would be consistent with the timing of today's

strong seismicity. This seismic activation also is consistent with geomagnetic

promotion. As noted in this summary of February 11-12 the effects on seismicity of the previous geomagnetic

storm  were maximized in the past several days. That had noted:

 

"the most disturbed the geomagnetic field has been since January 7 when the AP reached 38. A global seismic watch begins today (February 5) and extends

through February 10 with the most likely strong events towards the end of this period. The highest

chance for a strong earthquake in this period is about 10-15 degrees from the geomagnetic equator and at auroral latitudes." (February 8-10, 2015)

 

The earthquake in the North Atlantic of M 6.8-7.1 is the strongest recorded

in the world during the year 2015. Slightly smaller events hit on January 7

in Panama; January 23 in Vanuatu and February 12 in Argentina all with M 6.7-6.8.

This is the strongest earthquake within 300 km in at least 25 years.

It may be part of the regional activation of the area associated with the

strong eruption of Bardarbunga volcano in Iceland which has been ongoing

for the past half year and where an M 4.7 earthquake occurred today shortly

after this event in the North Atlantic. The only comparable event in the past 25 years in the region

was an M 6.8 on Febaruary 16, 1998. The last and only historical earthquake of M>=7.1 in this area of

the North Atlantic Ridge was recorded as an M 7.3 on October 16, 1974. Earthquakes

of this size on ocean ridges are rare due to the tectonics involved. The tectonics

also inhibits tsunamis. No tsunami was expected or observed with this earthquake." (February 13, 2015)

 

Like the event in 2015 this was associated with a major eruption about 1100 km to

the North in southern Iceland and was part of a strong activation of the

North Atlantic following the solar eclipse of March 29, 2025 and had been

expected as a consequence of stresses with that eclipse as noted in this summary:

 

"The new moon will arrive on March 29, 2025 at 10:58 UT.  This is a partial solar eclipse which will be visible in portions of the northeastern U.S, Eastern Canada, Greenland, north Atlantic, Europe, and Africa. Longitudes which are at local solar noon at the peak of this eclipse are near 15 East while those at local solar midnight are near 165 West. In the east these include areas of central Europe including Mt. Etna and Stromboli in Italy and the areas of Iceland and the Reykjanes Ridge and Greenland in the north Atlantic and portions of northeastern U.S, with maximum near Portland Maine at sunrise on March 29 and in the west the central and western Aleutians and Hawaii. Regions in the southern Hemisphere including Tonga, Samoa and Fiji and the South Sandwich Islands in the South Atlantic may also see tidal enhancement. These regions may see significant seismic enhancements with this new moon and partial solar eclipse. Other areas where fluids are involved in seismicity may also see increased seismicity near local solar noon or midnight. The chances of a tidally-related strong to major earthquake during the next week is considered to be high." (March 23-31, 2025)

 

This epicenter is near the antipode of the M 6.8 in southern New Zealand of

March 25 and also near the fourth node from Myanmar of March 28 (M 7.7) and

at the ninth node (135 degrees) from the M 7.1 in Tonga of March 30.

They Reykjanes Ridge had expected to experience enhanced seismicity

at this time in the forecasts for these two event as noted in previous

issues of this summary (March 28-April 2, 2025) as:

 

"Node 4 (90 degrees)

 

Myanmar to Fiji, Tonga, SE Alaska, Greenland, Baffin, South Island, New Zealand, Reykjanes Ridge, Madeira Islands,

 

Outer shadow zone edge (141-148 degrees)

 

Tonga to mid-Atlantic, Iran, Lebanon, Iceland, Azores, Turkey,  Mid-Atlantic, Reykjanes Ridge," (April 1-3, 2025) 

 

Forecast 171257 had expected this event within about 50 km was likely

in early April as a possibly strong earthquake.

 

Following is the EMSC (O:) and forecast (P:) data for this earthquake:

 

There is some danger for the Pacific Plate-North American plate seismicity

following this earthqake in the Reykjanes Ridge. Following is a listing

in the Reykjanes area of M>=6.5 over the past century. The second reading

is for an earthquake in the California/Nevada area in the days following

the Reykjanes Ridge event.

 

12 11 12 57  7 1954  52.500  -32.000   0 6.5   0

12 16 11  7 11 1954  39.280 -118.120   0 7.3   0 Dixie Valley, Nevada

 

12 25  9 33 36 1956  48.750  -27.750   0 6.5   0

12 31 17 39 24 1956  38.283 -118.967  10 5.5   0 California-Nevada border

 

 2 13 23 14 24 1967  52.761  -34.098  33 6.8 159

 2 16 15  5 54 1967  37.422 -114.184  33 4.8  32 Caliente, Nevada

 2 16 19 41 27 1967  32.150 -116.016   5 4.6  16 Southern California

 2 17  8 12 56 1967  31.600 -116.240  10 4.6  12 Southern California

 2 18 18 48 56 1967  34.183 -117.266   1 4.7  26 Eastern Los Angeles

 

10 16  5 45 11 1974  52.710  -32.000  41 7.3 355

11  3  8 26 10 1974  31.000 -115.200  33 4.7   0 Baja California

 

02 16 23 53 19 1998  52.718  -33.677  10 6.8  10

02 18 14 29 34 1998  31.915 -115.746   3 4.6  10 Baja California

 

02 13 18 59 12 2015  52.635  -31.884  16 7.1  10

02 14 02 28 56 2015  37.142 -117.262  17 4.8  10 Ridgecrest, California

 

As can be seen an earthquake of M>=4.5 have occurred in California or Nevada

in four of six occurrences of such an event in the Reykjanes Ridge with

several within 2-3 days (mostly at the sixth node (60 degrees) or the seventh node (52 degrees)

from the mainshocks in the Reykjanes area. These largest of these was the M 7.3 in December, 1954

in the Dixie Valley of Nevada which occurred 4-5 days after the North Atlantic

quake. The reason for this corresponding California activity may have to do

with the location of the North Atlantic events which lie near the Euler Pole

for North America and the Pacific Plates. This is the point around which the

North American plate appears to rotate with respect to the Pacific Plate.

A line perpendicular to local faults in California extended on a globe

will intersect other such lines at the Euler Pole. So energy emitted

at the Euler Pole will interact with faults in California as a pulse rather

than piece-meal. This simultaneity causes larger and more wide-spread

fault slippage especially in basin and range tectoniss as occur in

Nevada. With this in mind this summary is issuing a seismic watch for

the Pacific Plate-North American Plate and especially for vertical or strike-slip tectonics

regions for the next week extending from the Gulf of California to Washington

State with a moderate possibility of a moderate to strong quake in this time

period. A likely time for such event would be within a couple of days of the next full moon on April 13.

 

O: 03APR2025 14:09:32 52.6N  32.1W ML=6.9  EMSC   Reykjanes Ridge       

P: 10APR2025 171257   53.0N  32.0W 4.0-6.1 CAAAA  North Mid-Atlantic Ridge      

 

An earthquake of M 4.0 occurred today in northern California in the California Geysers region.

NEIC reported it was felt with intensity II-III in California at Saint Helena, Cloverdale, Geyserville, Healdsburg, Hopland, Kelseyville, Angwin, Calistoga, Lakeport and Santa Rosa, California.

This epicenter is at 60 degrees (node 6) from the Reykjanes M 6.9 today and may

represent excess triggering from that event. More such activity along the

western coast of North America is expected in the next week (see above).

 

An M 3.1 also occurred in Central California shortly before the M 4.0 in the Geysers

today (see above). NEIC reported it was felt with intensity III in Hollister, Salinas, San Juan Bautista with lesser shaking as far as Oakland, California.

This epicenter is also at the sixth node from the Reykjanes Ridge.

 

NEIC also reported an M 3.2 was felt in western Colorado near Montrose today. NEIC reported it was felt with intensity III in Colorado at Montrose, Delta, Grand Junction and II in Fraser, Paonia, and perhaps as far as Denver.

This epicenter is at 52 degrees from Reykjanes ride (node 7) and may have

promoted by energy from that source.

 

NEIC reported an earthquake of M 4.7 in Java, Indonesia was felt with  intensity up to II-III in the area(s) of Java, Indonesia at Purbalingga and Purwokerto (IV).

EMSC reported moderate shaking in Cilacap Selatan, Adipala, Kedawung.

 

NEIC reported an earthquake of M 4.4 in Southern Iran was felt with  intensity up to II-III in the area(s) of Southern Iran at Fars in Marvdasht, Shiraz and in Ahwaz, Khuzestan, Iran.

EMSC reported moderate shaking in Shiraz, Iran.

 

 

NEIC reported an earthquake of M 2.6 in Nevada was felt with  intensity up to II-III in the area(s) of Nevada at Caliente.

This closely matches the location of a similar quake that followed an M 6.8

in the Reykjanes Ridge in February, 1967 near Caliente. 

 

 2 13 23 14 24 1967  52.761  -34.098  33 6.8 159

 2 16 15  5 54 1967  37.422 -114.184  33 4.8  Caliente, Nevada

 

NEIC reported an earthquake of M 4.8 in Southern Peru  was felt with  intensity up to II-III in the area(s) of  Southern Peru at Arequipa and Mollendo.

 

NEIC reported an earthquake of M 4.4 in Saudi Arabia was felt with  intensity up to II-III in the area(s) of Saudi Arabia at Jubail.

EMSC reported moderate shaking in Saudi Arabia at Al Jubail, Safwa, Dammam, Al Umran, Riyadh, Al Hisyan, and Ad Dawhah, Qatar.

 

NEIC reported earthquakes of M 4.9 in Central Vanuatu were felt with  intensity up to II-III in the area(s) of Vila Shefa, Vanuatu.

 

NEIC reported an earthquake of M 4.7 in Eastern Brazil was felt with  intensity up to II-III in the area(s) of Eastern Brazil at Sete Lagoas Minas Gerais.

This earthquake is located at the sixth node (60 degrees) from the Reykjanes event

and at 120 from recent strong earthquakes in Tonga and New Zealand and at 144

degrees from the Myanmar M 7.7 of March 28 and was probably promoted by

energy input from all these quakes.

 

The last earthquake of M>=4.7 within about 400 km of this epicenter in Brazil

occurred more than 35 years ago.

 

NEIC reported an earthquake of M 4.6 in Myanmar was felt with  intensity up to II-III in the area(s) of Myanmar in Sintgaing, Mandalay, Patheingyi, Pyinoolwin.

 

EMSC reported an earthquake of M 5.0 in Antofagasta, Chile was felt with  intensity up to IV in the area(s) of Antofagasta, Chile at Sierra Gorda.

 

EMSC reported an earthquake of M 4.0 in Turkey-Syria was felt with  intensity up to IV in the area(s) of Turkey-Syria at Cubuklu, Guzelburc, Karaali Bolugu, Gokmeydan, Asagi Kepirce, Karaagac, Mustafa Kemal, Yunus Emre, and in Syria at Al Ladhiqiyah.

 

No tropical cyclones are currently active

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

3710       0451   0502      0513   C2.5      (April 3, 2025)   6.6E-04  

3720       0614   0621      0623   C2.1      (April 3, 2025)   1.2E-03  

3770       0815   0822      0827   C2.3      (April 3, 2025)   7.4E-04  

3780       0909   0913      0915   C3.4      (April 3, 2025)   1.0E-03  

3800       1018   1029      1045   C2.0      (April 3, 2025)   3.1E-03  

New Ireland M 4.6 10:31 UT

 

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  minor storms April 4-5 unsettled April 6.  Solar M-flare chance: 70% X-class: 15% proton storm: 15%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    26 46 25 14:00 6  124 178

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 7.7 in Myanmar (white stipples) and Tonga (pink stipples)

and Earthquakes during the past day as reported by NEIC (colored circles).

 

 

DISTANCE RELATIONS FROM MYANMAR MARCH 29, 2025

 

Possible far-field triggering areas from the great quake of M 7.7-8.0 in

Myanmar, Southeast Asia of March 28, 2025 follow.

The magnitude of the mainshock (M 7.7-8.0) suggests extensive far-field

activity is likely with the probability of several strong far-field

earthquakes in the next week especially near the time of the eclipse of March 29.

The earthquake in Myanmar is at the fourth node (90 degrees) from the

epicenter of the M 6.8 in New Zealand of March 25 and was likely promoted

by energy from that source.

 

 

Antipodal (~180 degrees)

 

Myanmar to East Pacific Rise

 

Outer shadow zone edge (141-148 degrees)

 

Myanmar to Magallenes, Chile, Nicaragua, Northeast Pacific Rise, Eastern Mexico, Guatemala,  

 

Node 8 (135 degrees)

 

Myanmar to Leeward Is, Virgin Is, Michoacan, Mexico,

 

Node 3 (120 degrees)

 

Myanmar to North Atlantic, Central Mid-Atlantic, Ohio, Oklahoma, SE U.S. including Tennessee and Georgia, Baja California, Northern Gulf of Mexico, South Atlantic, 

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

 

Myanmar to South of Africa, Washington, Oregon States, British Columbia, Alberta, Nunavit, Quebec, Eastern Canada, Montana, Central Mid-Atlantic, Northern,  Kermadec Islands, Hawaii 

 

Node 4 (90 degrees)

 

Myanmar to Fiji, Tonga, SE Alaska, Greenland, Baffin, South Island, New Zealand, Reykjanes Ridge, Madeira Islands,

 

Node 5 (72 degrees)

 

Myanmar to Andreanof Islands, Solomon Is, Northern France, Germany, Libya, Central Italy, 

 

Node 6 (60 degrees)

 

Myanmar to Western Turkey, Ukraine, SW Australia, Kamchatka/Komandorsky Is, Crete, Greece, New Guinea,

 

Node 7 (52 degrees)

 

Myanmar to Eastern Turkey, Syria, Ethiopia, Kuril Is, Papua New Guinea, Guam, 

 

Node 8 (45 degrees)

 

Myanmar to Caucasus, Central Indonesia, Hokkaido, 

 

 

Preliminary expectations for far field triggering from Tonga (will be revised)

 

Antipodal (~180 degrees)

 

Tonga to Morocco, 

 

Outer shadow zone edge (141-148 degrees)

 

Tonga to mid-Atlantic, Iran, Lebanon, Iceland, Azores, Turkey,  Mid-Atlantic, Reykjanes Ridge, 

 

Node 3 (120 degrees)

 

Tonga to Greenland, Quebec, Tajikistan, Maine, Pakistan, Afghanistan, South Africa 

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

 

Tonga to South Indian Ocean, Nepal, Mississippi, Ohio, Northern Peru, Colombia, South of Africa, South Sandwich Islands, Bay of Bengal, Northern Missouri, Colombia, Bouvet Island, South Carolina, Alberta, Beaufort Sea, South of Africa, Georgia, Illinois, Louisiana, British Columbia, Canada,  Central Chile,  Myanmar, 

 

Node 4 (90 degrees)

 

Tonga to Eastern Mexico, Guatemala, Texas, South Indian Ridge, South Atlantic, South Sandwich Islands, Texas, Colorado, Idaho, Denali, Montana, British Columbia, Yukon Territory, Canada, Guatemala, Sichuan, China, Sumatra,   

 

Node 5 (72 degrees)

 

Tonga to Coast of Northern California, Baja California, Rat, Near Islands, Fox Islands, Andreanof Islands, Kuril Islands,  South of Sumatra, Coast of Oregon,  Honshu, Kyushu, Japan, Philippines, 

 

Node 6 (60 degrees)

 

Tonga to Molucca, Minahasa, Java, East Pacific Rise, New Guinea,

 

Node 7 (52 degrees)

 

Tonga to East Pacific Rise, South of Australia, Western Australia, New Guinea, Mariana Is, 

 

NODAL EARTHQUAKES LIKELY ASSOCIATED WITH REYKJANES RIDGE

 

Following are expected (and observed locations following the February, 2015 quake) of

far-field seismic enhancment at nodal distances from the M 6.9 in the Reykjanes

Ridge of April 3, 2025.

 

Antipodal (~180 degrees)

North Atlantic to Macquarie Islands, 

 

Outer shadow zone edge (141-148 degrees)

North Atlantic to Vanuatu, Kermadec Islands, 

 

Node 3 (120 degrees)

North Atlantic to Sumatra, Molucca, Talaud, Halmahera, 

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

North Atlantic to Aisen, Chile, Andaman Is. Taiwan, South Sandwich Islands, Volcano Islands, Honshu, Japan, 

 

Node 4 (90 degrees)

North Atlantic to Honshu, Japan, Central Chile, 

 

Node 5 (72 degrees)

North Atlantic to northern Peru, Pakistan, Andreanof Islands, Southern Mid-Atlantic, Northeast Pacific Rise, Peru,  

 

Node 6 (60 degrees)

North Atlantic to Nicaragua, Guatemala, Southern California, Alaska, Colombia, Central Mid-Atlantic, Mexico, Nevada, California, Costa Rica, 

 

Node 7 (52 degrees)

North Atlantic to Central Mid-Atlantic, Colorado, Texas, Idaho, Montana, Washington, British Columbia

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.5 during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for Myanmar (MDIS); Tonga (TDIS) and Reykjanes Ridge (RDIS).

Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04  4 09 10 2025  35.7  -97.4 2.8 WNW OF ARCADIA OKLAHOMA        M121 T91 R48

04  4 09 04 2025  35.7  -97.4 3.0 WNW OF ARCADIA OKLAHOMA        M121 T91 R48

04  4 08 31 2025   4.0  -82.6 4.8 SOUTH OF PANAMA"               M154 T92 R63

04  4 08 01 2025 -15.5 -174.5 5.7 WNW OF HIHIFO TONGA            M95 T4 R132

04  4 08 00 2025 -15.5 -174.6 4.5 WNW OF HIHIFO TONGA            M95 T4 R132

04  4 06 59 2025  -7.9  109.1 4.7 SSE OF CILACAP INDONESIA       M32 T75 R125

04  4 06 51 2025  31.5 -104.0 2.0 NW OF TOYAH TEXAS              M123 T84 R54

04  4 06 49 2025  31.7 -104.2 2.3 NW OF TOYAH TEXAS              M123 T84 R54

04  4 06 33 2025  31.5 -104.0 2.8 NW OF TOYAH TEXAS              M123 T84 R54

04  4 06 31 2025  38.8 -122.8 4.0 NW OF THE GEYSERS              M109 T75 R60

04  4 06 14 2025  31.7 -104.2 2.4 NW OF TOYAH TEXAS              M123 T84 R54

04  4 04 26 2025  32.9 -117.7 2.0 WSW OF ENCINITAS CA            M116 T75 R62

04  4 04 23 2025  36.8 -121.4 3.1 S OF RIDGEMARK CA              M111 T75 R61

04  4 03 44 2025  29.4   52.8 4.4 NNE OF AKBARāBāD IRAN        M39 T136 R64

04  4 03 28 2025  36.8 -121.3 2.1 TRES PINOS CA                  M111 T75 R61

04  4 03 07 2025 -21.2  -68.7 4.3 W OF OLLAGüE CHILE            M165 T96 R80

04  4 02 36 2025  37.4 -114.3 2.6 KM SE OF CALIENTE              M114 T80 R56

04  4 02 34 2025  45.5  145.5 4.7 N OF OTRADA RUSSIA             M46 T75 R82

04  4 02 33 2025 -22.2 -179.5 4.5 THE FIJI ISLANDS               M93 T5 R140

04  4 01 37 2025 -16.3  -72.5 4.8 EL PEDREGAL PERU               M167 T94 R77

04  4 01 28 2025  31.5 -104.0 2.4 NW OF TOYAH TEXAS              M123 T84 R54

04  4 01 01 2025  18.0  -68.3 3.4 DE YUMA DOMINICAN REPUBLIC     M137 T110 R44

04  4 00 33 2025 -23.7 -179.9 4.6 THE FIJI ISLANDS               M93 T6 R142

04  4 00 28 2025  52.6  -32.1 4.9 REYKJANES RIDGE"               M93 T136 R0

04  3 23 39 2025  27.4   50.0 4.4 AL JUBAYL SAUDI ARABIA         M41 T139 R64

04  3 23 20 2025  31.7 -104.5 2.0 WHITES CITY NEW MEXICO         M123 T84 R55

04  3 22 57 2025 -20.6 -178.1 4.6 WNW OF HOUMA TONGA             M93 T3 R138

04  3 22 18 2025  38.2 -117.8 2.3 KM SE OF MINA                  M112 T78 R58

04  3 22 10 2025  32.3 -104.7 3.4 WHITES CITY NEW MEXICO         M122 T84 R54

04  3 21 49 2025  52.4  -31.5 4.8 NORTHERN MID-ATLANTIC RIDGE"   M92 T136 R0

04  3 21 47 2025  43.2 -126.3 3.6 W OF BANDON OREGON             M104 T76 R59

04  3 21 30 2025  35.3 -117.8 2.1 WSW OF JOHANNESBURG CA         M114 T76 R60

04  3 21 11 2025 -28.4 -177.9 5.1 KERMADEC ISLANDS REGION"       M97 T8 R144

04  3 21 00 2025  18.3  -65.9 3.4 DEL RIO PUERTO RICO            M136 T112 R43

04  3 20 58 2025 -22.0  -68.6 5.0 NNE OF CALAMA CHILE            M165 T95 R80

04  3 20 38 2025  31.6 -104.0 2.1 NNW OF TOYAH TEXAS             M123 T84 R54

04  3 20 20 2025  39.1 -119.0 2.3 KM ENE OF YERINGTON            M111 T78 R58

04  3 19 20 2025  39.0 -123.2 2.4 SE OF BOONVILLE CA             M109 T75 R60

04  3 18 42 2025  14.3  146.8 5.1 VILLAGE NORTHERN MARIANA ISLAN M48 T51 R113

04  3 18 11 2025  38.8 -122.8 2.3 THE GEYSERS CA                 M109 T75 R60

04  3 17 59 2025 -23.5 -179.8 4.3 THE FIJI ISLANDS               M93 T6 R141

04  3 17 56 2025  52.7  -34.9 4.7 REYKJANES RIDGE"               M94 T134 R1

04  3 17 42 2025 -23.2 -179.9 4.4 THE FIJI ISLANDS               M93 T6 R141

04  3 16 05 2025  52.7  -35.0 5.4 REYKJANES RIDGE"               M94 T134 R1

04  3 15 22 2025  35.3 -118.6 2.4 NW OF TEHACHAPI CA             M114 T76 R60

04  3 14 54 2025  52.5  -32.5 4.6 REYKJANES RIDGE"               M93 T136 R0

04  3 14 39 2025  52.6  -34.8 4.6 REYKJANES RIDGE"               M94 T134 R1

04  3 14 29 2025  40.2 -124.7 2.6 W OF PETROLIA CA               M107 T75 R60

04  3 14 09 2025  52.5  -32.1 6.9 REYKJANES RIDGE"               M93 T136 R0

04  3 13 58 2025 -17.7  168.1 4.9 W OF PORT-VILA VANUATU         M80 T17 R141

04  3 13 42 2025   0.6  121.6 4.7 W OF GORONTALO INDONESIA       M32 T66 R122

04  3 13 11 2025  31.7 -101.7 2.1 GARDEN CITY TEXAS              M124 T86 R53

04  3 12 58 2025  31.7 -101.7 3.4 GARDEN CITY TEXAS              M124 T86 R53

04  3 11 53 2025  41.2 -116.7 2.6 KM NE OF VALMY                 M110 T80 R55

04  3 11 07 2025  38.7 -108.5 3.2 W OF DELTA COLORADO            M115 T84 R52

04  3 10 31 2025  -4.6  153.4 4.6 KOKOPO PAPUA NEW GUINEA        M62 T35 R131

04  3 09 48 2025  38.8 -122.8 2.1 WNW OF COBB CA                 M109 T75 R60

04  3 07 16 2025  35.7  -91.7 1.5 SW OF BATESVILLE ARKANSAS      M122 T95 R44

04  3 07 02 2025  -5.8  -50.5 4.7 WNW OF PARAUAPEBAS BRAZIL      M143 T118 R60

04  3 05 16 2025  12.2  -87.8 4.5 SSW OF JIQUILILLO NICARAGUA    M145 T90 R59

04  3 04 37 2025  54.3 -162.8 3.6 FALSE PASS ALASKA              M78 T74 R65

04  3 04 18 2025 -65.1  178.6 5.6 BALLENY ISLANDS REGION"        M106 T45 R160

04  3 04 10 2025  56.1 -156.5 3.0 ALASKA PENINSULA               M81 T77 R62

04  3 03 47 2025  23.2  120.4 4.6 WNW OF YUJING TAIWAN           M22 T77 R100

04  3 01 26 2025  36.5 -121.1 2.0 W OF PINNACLES CA              M112 T75 R61

04  3 01 19 2025  33.5  -82.3 2.0 NW OF GROVETOWN GEORGIA        M124 T102 R40

04  3 00 59 2025  39.7 -119.9 2.8 NE OF COLD SPRINGS             M110 T78 R58

04  3 00 41 2025  49.0 -122.4 2.3 ALDERGROVE EAST CANADA         M101 T82 R53

04  3 00 33 2025  34.1 -117.3 2.0 LOMA LINDA CA                  M115 T76 R60

 

 

April 3, 2025

 

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.

 

 

"A strong to major earthquake of M 6.8-6.9 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 minor injury was reported by a person who

fell down a flight of stars during the quake. The tsunami warning has  been

lifted. 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.

Eruptions of Sakurajima Volcano are expected after the M 6.9 to increase in

frequencies and amplitude. Sakurajima is located in Kyushu and is among the

most active volcanoes in Japan.  This epicenter in Kyushu is at the sixth node (60 degrees) from the M 7.4 in Vanuatu of December 17, 2024

and may have been promoted by energy from that source. It is also at 108 degrees

from Michoacan, Mexico where an M 6.2 occurred earlier in the day. This is in the

zone where core-mantle reflections of seismic waves return to the surface and

appear to help trigger enhanced seismicity at this distance from mainshocks.

 

...

 

The last earthquake of M>=6.8 in the area of Kyushu, Japan within about 200 km of today's

epicenter occurred on  August 8, 2024 with M 7.1 and today's event may be an

aftershock of that. An M 7.0 also hit the region on April 15, 2016." (January 13, 2025)

 

This epicenter, like an M 5.5 in the Near Islands, Alaska today, is located

at the fifth node from Tonga (M 7.1, March 30) and at the eleventh node (32.9 degrees)

from Myanmar and may have been promoted by energy from those sources.

 

A strong M 5.9-6.3 earthquake was felt in the area of the Molucca Sea today. NEIC reported

it was felt with intensity III in Manado, Sulawesi, Indonesia.

 

Today's epicenter is located at the sixth node (60 degrees) from Tonga (M 7.1, March 30)

and New Zealand (M 6.8 Mar. 28) and at the tenth node (36.0 degrees) from Myanmar (M 7.7, Mar. 28) and was

probably promoted by energy from those sources.

 

BMG gave the following parameters for this event:

 

O: 02APR2025 21:03:43  2.1N 126.7E ML=6.0  BMG    Molucca Sea, Indonesia

O: 02APR2025 21:03:39  2.2N 126.7E ML=6.3  RSSC   Molucca Sea, Indonesia

 

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)

 

Today's epicenter is located at the eigth node (45 degrees) from Tonga (M 7.1, March 30)

and the seventh node (106 degrees) from Myanmar (M 7.7, Mar. 28) and was

probably promoted by energy from those sources.

 

O: 03APR2025 04:18:19 65.1S 178.6E ML=5.6  NEIC   Balleny Islands

 

The strongest earthquake in the U.S. or Canada today was an M 5.5 (EMSC) to M 5.8 (RSSC) in the Near Islands, Alaska. NEIC reported it may have been felt with intensity up to IV in the epicentral area.

The last earthquake in the Near Islands, Alaska with M>=5.5 within about 200 km

of today's epicenter occurred on December 29, 2021 with M 5.7. The last of significantly

larger magnitude in the area was an M 6.8 on June 2, 2017. At the time this summary

noted:

 

"An earthquake of M 5.7 also occurred in the Near Islands, Aleutians, Alaska today. It was not reported felt in this remote area.

This is the strongest earthquake in the Near Islands within about 200 km of this

epicenter since an M 6.8 on June 2, 2017. An M 7.7 west of this epicenter occurred

in the Komandorsky Islands on July 17, 2017 following an M 6.3 foreshock." (December 29, 2021)

 

Today's epicenter is located at the fifth node (72 degrees) from the M 7.1 in Tonga and near

100 degrees from the M 6.8 in New Zealand and may have been promoted by

energy from those sources.

 

 

NEIC reported an earthquake of M 4.6 in Taiwan was felt with  intensity up to II-III in the area(s) of Taiwan in Chiayi, Tainan and Taoyuan Counties.

This epicenter is near the ninth node (80 degrees) from New Zealand and Tonga

and was probably promoted by energy from those sources.

 

NEIC reported an earthquake of M 2.8 in western Nevada was felt with  intensity up to II-III in the area(s) of western Nevada at Sparks and Reno and in Chilcoot, California.

This epicenter is near the ninth node (80 degrees) from Tonga and 108 degrees from New Zealand

and was probably promoted by energy from those sources.

 

NEIC reported an earthquake of M 2.8 in Central California was felt with  intensity up to IV in the area(s) of Central California at Salinas.

 

NEIC reported an earthquake of M 5.0 south of Myanmar  was felt with  intensity up to II-III in the area(s) of Myanmar in Myanmar at Rangoon and Syriam and in Bangkok, Thailand.

This is a regional aftershock of the M 7.7 in Myanmar of March 28 being nearly 700 km

south of that epicenter. It is located at the fourth node (90 degrees)

from the M 6.8 in New Zealand and may have been promoted by energy from that source.

 

A new observation related to the earthquake of M 7.7 in Myanmar emerged as

a video on the web today. The video shows a wall of water surging through the

strees in Ruili, Yunnan, China. While the tidal wave hit about 1.5 hours

after the M 7.7 mainshock, it has been hypothesized it was caused by a ruptured water reservoir

in the area. Casualties with this tidal wave were not reported.

 

CSN reported an M 4.0 in Coquimbo Chile today with the following parameters:

 

03-04-2025  03:46  29.90S 71.50W  59  4.0    IV   Coquimbo at Andacoollo; III in La Serena, La Higuera, Coquimbo and Rio Hurtado, Chile.

 

 

No tropical cyclones are currently active

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

 

3240       0115   0126      0143   C2.3      (April 2, 2025)   3.8E-03  

3260       0143   0147      0150   C2.0      (April 2, 2025)   1.1E-03  

Mindanao M 4.6 01:52 UT

 

3310       0445   0449      0451   C1.6      (April 2, 2025)   7.3E-04  

3360       0621   0632      0644   C1.9      (April 2, 2025)   2.5E-03  

3370       0711   0716      0718   C1.8      (April 2, 2025)   8.8E-04  

3390       1011   1019      1023   C2.0      (April 2, 2025)   9.3E-04  

3410       1039   1053      1114   C8.0      (April 2, 2025)   2.6E-03  

Myanmar M 4.7 10:45 UT

Thailand M 3.5 10:49 UT

 

3520       1114   1124      1127   C6.2      (April 2, 2025)   5.5E-03  

Fiji M 4.8 11:36 UT

 

3530       1424   1430      1432   C2.2      (April 2, 2025)   9.9E-04  

3620       2008   2028      2039   C2.6      (April 2, 2025)   7.7E-04  

3640       2239   2248      2251   C3.0      (April 2, 2025)   8.2E-04  

3660       2308   2315      2323   C1.7      (April 2, 2025)   1.6E-03  

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  active April 3 minor storms April 4-5.  Solar M-flare chance: 70% X-class: 15% proton storm: 15%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)    22 29 16 08:00 5  158 180

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 7.7 in Myanmar (white stipples) and Tonga (pink stipples)

and Earthquakes during the past day as reported by NEIC (colored circles).

 

 

DISTANCE RELATIONS FROM MYANMAR MARCH 29, 2025

 

Possible far-field triggering areas from the great quake of M 7.7-8.0 in

Myanmar, Southeast Asia of March 28, 2025 follow.

The magnitude of the mainshock (M 7.7-8.0) suggests extensive far-field

activity is likely with the probability of several strong far-field

earthquakes in the next week especially near the time of the eclipse of March 29.

The earthquake in Myanmar is at the fourth node (90 degrees) from the

epicenter of the M 6.8 in New Zealand of March 25 and was likely promoted

by energy from that source.

 

 

Antipodal (~180 degrees)

 

Myanmar to East Pacific Rise

 

Outer shadow zone edge (141-148 degrees)

 

Myanmar to Magallenes, Chile, Nicaragua, Northeast Pacific Rise, Eastern Mexico, Guatemala,  

 

Node 8 (135 degrees)

 

Myanmar to Leeward Is, Virgin Is, Michoacan, Mexico,

 

Node 3 (120 degrees)

 

Myanmar to North Atlantic, Central Mid-Atlantic, Ohio, Oklahoma, SE U.S. including Tennessee and Georgia, Baja California, Northern Gulf of Mexico, South Atlantic, 

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

 

Myanmar to South of Africa, Washington, Oregon States, British Columbia, Alberta, Nunavit, Quebec, Eastern Canada, Montana, Central Mid-Atlantic, Northern,  Kermadec Islands, Hawaii 

 

Node 4 (90 degrees)

 

Myanmar to Fiji, Tonga, SE Alaska, Greenland, Baffin, South Island, New Zealand, Reykjanes Ridge, Madeira Islands,

 

Node 5 (72 degrees)

 

Myanmar to Andreanof Islands, Solomon Is, Northern France, Germany, Libya, Central Italy, 

 

Node 6 (60 degrees)

 

Myanmar to Western Turkey, Ukraine, SW Australia, Kamchatka/Komandorsky Is, Crete, Greece, New Guinea,

 

Node 7 (52 degrees)

 

Myanmar to Eastern Turkey, Syria, Ethiopia, Kuril Is, Papua New Guinea, Guam, 

 

Node 8 (45 degrees)

 

Myanmar to Caucasus, Central Indonesia, Hokkaido, 

 

 

Preliminary expectations for far field triggering from Tonga (will be revised)

 

Antipodal (~180 degrees)

 

Tonga to Morocco, 

 

Outer shadow zone edge (141-148 degrees)

 

Tonga to mid-Atlantic, Iran, Lebanon, Iceland, Azores, Turkey,  Mid-Atlantic, Reykjanes Ridge, 

 

Node 3 (120 degrees)

 

Tonga to Greenland, Quebec, Tajikistan, Maine, Pakistan, Afghanistan, South Africa 

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

 

Tonga to South Indian Ocean, Nepal, Mississippi, Ohio, Northern Peru, Colombia, South of Africa, South Sandwich Islands, Bay of Bengal, Northern Missouri, Colombia, Bouvet Island, South Carolina, Alberta, Beaufort Sea, South of Africa, Georgia, Illinois, Louisiana, British Columbia, Canada,  Central Chile,  Myanmar, 

 

Node 4 (90 degrees)

 

Tonga to Eastern Mexico, Guatemala, Texas, South Indian Ridge, South Atlantic, South Sandwich Islands, Texas, Colorado, Idaho, Denali, Montana, British Columbia, Yukon Territory, Canada, Guatemala, Sichuan, China, Sumatra,   

 

Node 5 (72 degrees)

 

Tonga to Coast of Northern California, Baja California, Rat, Near Islands, Fox Islands, Andreanof Islands, Kuril Islands,  South of Sumatra, Coast of Oregon,  Honshu, Kyushu, Japan, Philippines, 

 

Node 6 (60 degrees)

 

Tonga to Molucca, Minahasa, Java, East Pacific Rise, New Guinea,

 

Node 7 (52 degrees)

 

Tonga to East Pacific Rise, South of Australia, Western Australia, New Guinea, Mariana Is, 

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.5 during the past day in

reverse chronological order. Distances from  major recent earthquakes (in degrees)

are added at the end of the earthquake data line. These include in this

listings distances to the nearest degree between the event and the previous

mainshock as for Myanmar (MDIS); Tonga (TDIS) and New Zealand (ZDIS).

Earthquakes are considered nodal if they occur within about 2 degrees of

nodes (360/n*m) where n and m are small integers. For example in the current model an earthquake

would be considered possibly nodal at node 3 if it occurs at 117.5-122.5 degrees

from a mainshock.

 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04  3 05 16 2025  12.2  -87.8 4.5 SSW OF JIQUILILLO NICARAGUA    M145 T90 Z109

04  3 04 37 2025  54.3 -162.8 3.6 FALSE PASS ALASKA              M78 T74 Z104

04  3 04 18 2025 -65.1  178.6 5.6 BALLENY ISLANDS REGION"        M106 T45 Z19

04  3 04 10 2025  56.0 -156.5 3.1 ALASKA PENINSULA               M81 T77 Z107

04  3 03 47 2025  23.2  120.4 4.6 WNW OF YUJING TAIWAN           M22 T77 Z80

04  3 01 26 2025  36.5 -121.1 2.0 W OF PINNACLES CA              M112 T75 Z105

04  3 00 59 2025  39.7 -119.9 2.8 NE OF COLD SPRINGS             M110 T78 Z108

04  2 22 34 2025  40.3 -125.0 2.8 W OF PETROLIA CA               M107 T75 Z106

04  2 22 22 2025  34.5 -119.0 2.0 NNW OF FILLMORE CA             M114 T75 Z105

04  2 21 42 2025  31.1  131.4 4.7 SSE OF KUSHIMA JAPAN           M32 T73 Z83

04  2 21 06 2025 -16.7 -173.5 4.9 SSE OF HIHIFO TONGA            M96 T3 Z34

04  2 21 04 2025  39.5 -119.5 2.2 KM NW OF STAGECOACH            M110 T78 Z108

04  2 21 03 2025   2.2  126.7 6.3 MOLUCCA SEA, INDONESIA         M35 T62 Z59

04  2 21 03 2025   2.1  126.8 5.9 WNW OF TOBELO INDONESIA        M35 T62 Z59

04  2 21 03 2025   2.1  126.7 6.0 MOLUCCA SEA, INDONESIA         M35 T62 Z59

04  2 20 16 2025  36.0 -120.7 2.8 NE OF BRADLEY CA               M112 T75 Z105

04  2 18 45 2025   3.3  128.2 4.3 N OF TOBELO INDONESIA          M36 T61 Z59

04  2 18 01 2025  24.1  121.6 4.3 HUALIEN CITY TAIWAN            M23 T76 Z81

04  2 17 43 2025  41.9 -119.6 2.4 E OF FORT BIDWELL              M108 T79 Z110

04  2 17 14 2025  35.4 -117.8 2.2 W OF JOHANNESBURG CA           M114 T76 Z106

04  2 16 27 2025  15.5   95.6 5.0 PYAPON BURMA (MYANMAR)         M6 T95 Z88

04  2 16 26 2025  53.3  172.8 5.5 ATTU STATION ALASKA            M64 T74 Z99

04  2 15 58 2025  48.3 -124.6 2.1 NEAH BAY WASHINGTON            M101 T81 Z112

04  2 15 45 2025  -6.5  128.0 4.3 LOSPALOS TIMOR LESTE           M42 T57 Z51

04  2 15 35 2025 -22.9  -66.6 4.3 ABRA PAMPA ARGENTINA           M163 T97 Z96

04  2 14 03 2025  31.0  131.5 6.2 ENE OF NISHINOOMOTE JAPAN      M32 T73 Z83

04  2 13 58 2025 -18.2 -175.0 4.3 WNW OF NEIAFU TONGA            M95 T2 Z32

04  2 13 24 2025   0.7  -29.6 5.2 CENTRAL MID-ATLANTIC RIDGE"    M122 T140 Z132

04  2 11 36 2025 -22.2 -179.5 4.8 THE FIJI ISLANDS               M93 T5 Z27

04  2 10 45 2025  20.9   96.1 4.7 MEIKTILA BURMA (MYANMAR)       M1 T97 Z92

04  2 10 22 2025  40.6 -119.0 2.4 BLACK ROCK CITY                M109 T79 Z109

04  2 08 03 2025  41.2 -116.7 2.6 KM NE OF VALMY                 M110 T80 Z111

04  2 07 46 2025  45.6 -111.8 2.4 SSE OF PONY MONTANA            M108 T86 Z116

04  2 07 38 2025  38.8 -122.8 2.0 THE GEYSERS CA                 M109 T75 Z106

04  2 07 29 2025  18.8  -64.5 3.4 BAY U.S. VIRGIN ISLANDS        M135 T113 Z130

04  2 07 24 2025  41.2 -116.7 2.0 KM NE OF VALMY                 M110 T80 Z111

04  2 06 52 2025  18.3  -68.0 3.6 PUNTA CANA DOMINICAN REPUBLIC  M136 T110 Z127

04  2 06 15 2025  41.2 -116.7 2.1 KM NE OF VALMY                 M110 T80 Z111

04  2 05 43 2025  37.9 -122.2 2.8 W OF ORINDA CA                 M110 T75 Z105

04  2 05 21 2025  29.0  -98.0 2.9 FALLS CITY TEXAS               M127 T88 Z114

04  2 05 10 2025  35.3 -117.8 2.2 WSW OF JOHANNESBURG CA         M114 T76 Z106

04  2 04 41 2025  41.9 -119.6 2.2 E OF FORT BIDWELL              M108 T79 Z110

04  2 04 35 2025  26.0  128.5 4.7 ESE OF KATSUREN-HAEBARU JAPAN  M30 T72 Z79

04  2 03 59 2025  19.1  -68.1 3.6 PUNTA CANA DOMINICAN REPUBLIC  M136 T110 Z128

04  2 03 44 2025 -12.2  167.1 4.5 NNW OF SOLA VANUATU            M77 T19 Z34

04  2 03 38 2025  29.0  -98.0 2.1 FALLS CITY TEXAS               M127 T88 Z114

04  2 02 55 2025  18.9  -65.2 3.4 AMALIE U.S. VIRGIN ISLANDS     M135 T113 Z129

04  2 01 11 2025  35.9 -117.7 2.1 LITTLE LAKE CA                 M114 T77 Z106

04  2 00 59 2025 -20.4 -173.7 5.0 SE OF PANGAI TONGA             M97 T0 Z31

04  2 00 42 2025  40.4 -125.0 3.3 WNW OF PETROLIA CA             M107 T75 Z106

04  2 00 29 2025 -56.9 -142.2 6.3 PACIFIC-ANTARCTIC RIDGE"       M125 T43 Z32

04  2 00 22 2025   3.2   97.5 4.4 SE OF BLANGPIDIE INDONESIA     M18 T89 Z77

04  2 00 20 2025 -10.2  161.4 4.5 KIRAKIRA SOLOMON ISLANDS       M71 T25 Z36

04  2 00 19 2025  28.5   87.1 4.3 NNE OF LOBUCHE NEPAL           M10 T107 Z103

04  2 00 01 2025  41.2 -116.7 3.3 NEVADA                         M110 T80 Z111

 

April  2, 2025

 

 

New toll statistics have been for casualties associated with the M 7.7 in

Myanmar of March 28, 2025. Chinese TV identifies 2719 dead, 4500 injured with more than

3000 likely dead. Myanmar State Media reports about 2700 dead including 50 preschoolers and 2 teachers who died when their preschool collapsed - 

but cautions that the civil war is preventing efficient search and rescue

efforts from proceeding. In Bangkok, Thailand official figures show 20 dead

and 74 still  missing beneath piles of debris.

 

The largest aftershock in Myanmar today was an M 5.0 which NEIC reported was felt with

intensity IV in Rangoon, Myanmar and II in Pyinmana and Sagaing and in Bangkok and Bang Sao Thong, Thailand.

EMSC reported jerks at Reykjavik, Kopavogur, Selfoss, Iceland.

 

A strong eruption of Grindavik Volcano in southern Iceland began today.

It was apparently promoted by the second strongest solar flare in the past month

which coincided with the initial eruption (see below). After several hours moderate earthquakes

includeing those of M 5.2 and 4.9 occurred. NEIC reported the M 5.2 was felt

with intensity up to VI in Sudurnes, Iceland at Keflavik and IV in Seltjarnarnes; III in Kopavogur, Reykjavik, Akranes and II in Slefoss.

The earthquake of M 5.2 is the strongest within about 200 km in this area of

Iceland since an M 5.4 on July 31, 2022. The last of significantly larger magnitude

in Iceland was an M 6.2 on May 29, 2008. At the time of the July, 2022 event

this summary noted:

 

"The strongest earthquake felt in the world today was an M 5.4 in Iceland. It was felt with maximum intensity VI in Suournes at Grindavik and IV in Vogar, Njarovik, Keflavik, Alftanes and Kooavogur and III in Garbour.

This continues a series of earthquakes in this area which began with the new moon

on July 30 as noted in the previous issue of this summary:

 

"A series of light to moderate earthquakes occurred in southern Iceland today.

These were felt in the same region where a volcanic eruption of Fagradalsfjall

Volcano occurred late in 2021. Most of today's events were at a deeper focus

and did not suggest an imminent volcanic eruption but a new eruption seems

likely in the next several days. Today's activity occurred beginning at

local solar noon with an M 3.6 and was probably promoted by high tidal stresses

associated with the new moon of July 28 as noted ..." (July 31, 2022)

 

 

An eruption of Grindavik Volcano in Iceland is deemed imminent by local authorities. It has been preceded by

an energetic swarm of earthquakes across much of southwestern Iceland. 

Due to the large amount of stored lava officials warn this eruption could be

much larger than previous ones.  Lava has begun to flow near Reykjavik, Iceland's capital  and many local communities

have been evacuated. The famous Blue Lagoon Spa and the town of Frindavik have been

evacuated. Shortly after the evacuatioins and while this issue was going to press,

the volcano did erupt with flames and smoke and flowing lava. The open fissure

is continuing to extend to the south. Damag to a hot water pipeline in northern

Grindavik was reported. According to press accounts, the eruption began about 06:30 UT

This epicenter is at the ninth node from Myanmar and at the third node (120 degrees)

from TC Courtney and may have been promoted by energy from those sources.

 

This eruption was probably triggered by a strong M5.6 class solar flare, the

second strongest in the past month after a X1.1 on March 28, 2025 (SWPC #1760).

Several flares of similar size to today's occurred in early February, 2025

(M8.8, M7.6, M7.5, M 5.8 - February 3-7, 2025) and an X2.0 occurred on February 23, 2025 (#5990).

So, this flare of M5.6 is a significant flare. Data for this and a second

M-class flare later in the day from SWPC follow.

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

2880       0630   0646      0653   M5.6      (April 1, 2025)   3.1E-02  

Start of Gridavik Volcanic Eruption ~ 06:30 UT

 

 

3220       2218   2231      2241   M2.5      (April 1, 2025)   2.1E-02  

Pacific-Antarctic M 6.3 00:29 UT

 

Given the significance of the M5.6 flare today and the fact that it coincided

with the eruption of Grindavik Volcano near 06:30 UT is a significant

simultaneous occurrence and is likely a case of solar flare effects (SFE)

triggering.

 

 

A second strong solar flare of M2.5 (#3220 see list above) occurred while longitudes in the

central Pacific (130-170 West) were near local solar noon - a time when

solar flares are most geoeffective. So, it should come to no surprise that

the strongest earthquake of the day was an M 6.3 on the Pacific-Antarctic

Ridge (at 142W longitude) was near local solar noon at the time of this flare.

While it occurred about two hours after the flare it is most likely

triggered by SFE from flare 3220.

 

The last earthquake in this area of the Pacific-Antarctic Ridge with M>=6.3

was recorded by NEIC as occurring on October 30, 2010 with M 6.3. Other

events in the area of equal or larger magnitude in the past 35 years all

occurred with M 6.3 - on May 12, 2005; October 11, 1998 and August 23, 1995.

At the time of the M 6.3 on October 30, 2010 this summary noted:

 

"The strongest earthquake of the day was an M 6.4 in the South Pacific

Ocean on the Pacific-Antarctic Ridge. This is a remote region and the

earthquake was probably not felt in the region. This type of earthquake

(transform) seldom triggers a tsunami and none was expected with this

event. In the past 20 years two earthquakes have hit the Pacific-Antarctic

Ridge with M>=6.4 - an event of M 5.5 on August 6, 2001 and an M 6.5 on May 12,

2005. Both were to the east of today's epicenter." (October 30, 2010)

 

A pair of light earthquakes occurred in the San Francisco Bay area of California today with M 2.9 and M 2.8. NEIC reported the M 2.8 was felt with intensity IV in Dublin, Walnut Creed and III in San Francisco, Benicia, Lafayette, Walnut Creek, Oakland, Emeryville, Berkeley, Albany, and Tracy with lesser shaking as far as about 50 km from the epicenter.

NEIC reported felt intensities for the M 2.9 in the San Francisco area with intensity III in Danville, Alamo, Dublin, San Ramon, Sunol, Walnut Creek, Oakland, Berkeley, Novato, Daly City, San Francisco.

 

 

A strong earthquake also occurred  today as an M 5.7-6.3 in Timor, Banda Sea, Indonesia. NEIC reported it was felt with intensity III in Suai Cova Lima, Dili, East Timor and in the Northern Territory of Australia at Conawarra and Darwin with intensity II-III.

EMSC reported moderate to strong shaking in Kota Lama, Kupang, Dili, Timor.

This epicenter is at the eighth node (45 degrees) from the Myanmar quake of

March 28 and may have been promoted by energy from that source.

BMG gave the following data for this event:

 

 

O: 01APR2025 10:15:54  7.7S 128.6E ML=6.3  BMG    Timor, Indonesia

 

 

NEIC reported earthquakes of M 2.9 and M 2.8 in Southern Texas were felt with  intensity up to II-III in the area(s) of Southern Texas at Falls City.

 

NEIC reported an earthquake of M 3.3 off northern California  was felt with  intensity up to II-III in the area(s) of northern California at Arcata. 

 

NEIC reported an earthquake of M 5.0 in Ryukyu Islands, Japan was felt with  intensity up to II-III in the area(s) of Ryukyu Islands, Japan in Okinawa at Ishikawa and Yomitan.

 

NEIC reported an earthquake of M 4.6 in Afghanistan was felt with  intensity up to II in the area(s) of Afghanistan in Pakistan at Abottabad and Bat Khela North-West Frontier.

EMSC reported moderate shaking in Shuroobod and Doghiston, Tajikistan, and in Kabul, Afghanistan.

 

NEIC reported an earthquake of M 2.6 in Central California was felt with  intensity up to II-III in the area(s) of Central California at California City.

 

NEIC reported an earthquake of M 3.7 in Southern Alaska was felt with  intensity up to II-III in the area(s) of Southern Alaska with III in Matanuska-Susitna Borough and II in Chugiak.

 

NEIC reported an earthquake of M 4.8 in Southern Myanmar was felt with  intensity up to II-III in the area(s) of Southern Myanmar with V at Pyinmana and IV in Mandalay.

 

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 at Pahrump, Nevada.

 

PHIVOLCS reported an earthquake of M 4.6 in Northern Mindanao, Philippines was felt with  intensity up to IV in the area(s) of Northern Mindanao, Philippines with I in Dapa, Surigao del Norte.

 

PHIVOLCS reported an earthquake of M 5.0 in Mindoro, Philippines was felt with  intensity up to IV in the area(s) of Northern Mindanao, Philippines with I Mindoro at Lubang, Paluan, Mamburao and Santa Cruz, Occidental Mindoro.

 

 

No tropical cyclones are currently active

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

2820       0123   0132      0137   C3.2      (April 1, 2025)   1.1E-03  

2830       0258   0306      0330   C3.6      (April 1, 2025)   6.5E-03  

Greenland Sea M 3.1 02:57 UT

 

3050       0330   0335      0339   C2.8      (April 1, 2025)   1.1E-03  

2880       0630   0646      0653   M5.6      (April 1, 2025)   3.1E-02  

Start of Gridavik Volcanic Eruption ~ 06:30 UT

 

2910       0747   0755      0802   C5.3      (April 1, 2025)   3.6E-03  

Iceland M 3.0-3.6 07:52 - 08:08 UT

 

2990       1031   1040      1046   C5.8      (April 1, 2025)   3.0E-03  

Myanmar M 5.0 11:01 UT

Iceland M 3.1 ... 10:36 UT

Azores M 2.2, 2.3 1042 UT

 

3040       1458   1502      1511   C2.1      (April 1, 2025)   1.6E-03  

3110       1644   1652      1658   C3.5      (April 1, 2025)   2.6E-03  

Iceland M 4.9, 4.6, 5.2 16:58, 16:57, 1654 UT

Iceland M 3.5 16:45 UT

Veracruz, Mexico M 3.8 16:47 UT

 

3160       1835   1843      1850   C3.1      (April 1, 2025)   2.4E-03  

Fiji M 4.6 18:46 UT

 

3170       1929   1939      1945   C4.1      (April 1, 2025)   3.2E-03  

3200       2045   2100      2105   C5.2      (April 1, 2025)   6.6E-03  

3230       2105   2110      2112   C5.2      (April 1, 2025)   3.1E-03  

3210       2200   2208      2218   C3.5      (April 1, 2025)   7.8E-04  

Kuril M 4.1 22:04 UT

 

3220       2218   2231      2241   M2.5      (April 1, 2025)   2.1E-02  

Pacific-Antarctic M 6.3 00:29 UT

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  active April 2 quiet April 3 minor storms April 4.  Solar M-flare chance: 75% X-class: 25% proton storm: 60%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)     5  2  5 21:00 2  147 182

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to the M 7.7 in Myanmar (white stipples) and Tonga (pink stipples)

and Earthquakes during the past day as reported by NEIC (colored circles).

 

 

DISTANCE RELATIONS FROM MYANMAR MARCH 29, 2025

 

Possible far-field triggering areas from the great quake of M 7.7-8.0 in

Myanmar, Southeast Asia of March 28, 2025 follow.

The magnitude of the mainshock (M 7.7-8.0) suggests extensive far-field

activity is likely with the probability of several strong far-field

earthquakes in the next week especially near the time of the eclipse of March 29.

The earthquake in Myanmar is at the fourth node (90 degrees) from the

epicenter of the M 6.8 in New Zealand of March 25 and was likely promoted

by energy from that source.

 

 

Antipodal (~180 degrees)

 

Myanmar to East Pacific Rise

 

Outer shadow zone edge (141-148 degrees)

 

Myanmar to Magallenes, Chile, Nicaragua, Northeast Pacific Rise, Eastern Mexico, Guatemala,  

 

Node 8 (135 degrees)

 

Myanmar to Leeward Is, Virgin Is, Michoacan, Mexico,

 

Node 3 (120 degrees)

 

Myanmar to North Atlantic, Central Mid-Atlantic, Ohio, Oklahoma, SE U.S. including Tennessee and Georgia, Baja California, Northern Gulf of Mexico, South Atlantic, 

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

 

Myanmar to South of Africa, Washington, Oregon States, British Columbia, Alberta, Nunavit, Quebec, Eastern Canada, Montana, Central Mid-Atlantic, Northern,  Kermadec Islands, Hawaii 

 

Node 4 (90 degrees)

 

Myanmar to Fiji, Tonga, SE Alaska, Greenland, Baffin, South Island, New Zealand, Reykjanes Ridge, Madeira Islands,

 

Node 5 (72 degrees)

 

Myanmar to Andreanof Islands, Solomon Is, Northern France, Germany, Libya, Central Italy, 

 

Node 6 (60 degrees)

 

Myanmar to Western Turkey, Ukraine, SW Australia, Kamchatka/Komandorsky Is, Crete, Greece, New Guinea,

 

Node 7 (52 degrees)

 

Myanmar to Eastern Turkey, Syria, Ethiopia, Kuril Is, Papua New Guinea, Guam, 

 

Node 8 (45 degrees)

 

Myanmar to Caucasus, Central Indonesia, Hokkaido, 

 

 

Preliminary expectations for far field triggering from Tonga (will be revised)

 

Antipodal (~180 degrees)

 

Tonga to Morocco, 

 

Outer shadow zone edge (141-148 degrees)

 

Tonga to mid-Atlantic, Iran, Lebanon, Iceland, Azores, Turkey,  Mid-Atlantic, Reykjanes Ridge, 

 

Node 3 (120 degrees)

 

Tonga to Greenland, Quebec, Tajikistan, Maine, Pakistan, Afghanistan, South Africa 

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

 

Tonga to South Indian Ocean, Nepal, Mississippi, Ohio, Northern Peru, Colombia, South of Africa, South Sandwich Islands, Bay of Bengal, Northern Missouri, Colombia, Bouvet Island, South Carolina, Alberta, Beaufort Sea, South of Africa, Georgia, Illinois, Louisiana, British Columbia, Canada,  Central Chile,  Myanmar, 

 

Node 4 (90 degrees)

 

Tonga to Eastern Mexico, Guatemala, Texas, South Indian Ridge, South Atlantic, South Sandwich Islands, Texas, Colorado, Idaho, Denali, Montana, British Columbia, Yukon Territory, Canada, Guatemala, Sichuan, China, Sumatra,   

 

Node 5 (72 degrees)

 

Tonga to Coast of Northern California, Baja California, Rat Islands, Fox Islands, Andreanof Islands, Kuril Islands,  South of Sumatra, Coast of Oregon,  Honshu, Kyushu, Japan, Philippines, 

 

Node 6 (60 degrees)

 

Tonga to Molucca, Minahasa, Java, East Pacific Rise, New Guinea,

 

Node 7 (52 degrees)

 

Tonga to East Pacific Rise, South of Australia, Western Australia, New Guinea, Mariana Is, 

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.5 during the past day in

reverse chronological order. 

 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION DISTANCES FROM LARGE EQ

 

                  N+S-  E+W-             Mainsdist Mainsdist Mainsdist

 

04  2 11 36 2025 -22.2 -179.5 4.8 THE FIJI ISLANDS               M93 T5 Z27

04  2 10 45 2025  20.9   96.1 4.7 MEIKTILA BURMA (MYANMAR)       M1 T97 Z92

04  2 10 22 2025  40.6 -118.9 2.2 BLACK ROCK CITY                M109 T79 Z109

04  2 07 38 2025  38.8 -122.8 2.0 THE GEYSERS CA                 M109 T75 Z106

04  2 07 29 2025  18.8  -64.5 3.4 BAY U.S. VIRGIN ISLANDS        M135 T113 Z130

04  2 06 52 2025  18.3  -68.0 3.6 PUNTA CANA DOMINICAN REPUBLIC  M136 T110 Z127

04  2 05 43 2025  37.9 -122.2 2.8 W OF ORINDA CA                 M110 T75 Z105

04  2 05 21 2025  29.0  -98.0 2.9 FALLS CITY TEXAS               M127 T88 Z114

04  2 04 35 2025  26.0  128.5 4.7 ESE OF KATSUREN-HAEBARU JAPAN  M30 T72 Z79

04  2 03 59 2025  19.1  -68.1 3.6 PUNTA CANA DOMINICAN REPUBLIC  M136 T110 Z128

04  2 03 44 2025 -12.2  167.1 4.5 NNW OF SOLA VANUATU            M77 T19 Z34

04  2 03 38 2025  29.0  -98.0 2.1 FALLS CITY TEXAS               M127 T88 Z114

04  2 02 55 2025  18.9  -65.2 3.4 AMALIE U.S. VIRGIN ISLANDS     M135 T113 Z129

04  2 01 11 2025  35.9 -117.7 2.1 LITTLE LAKE CA                 M114 T77 Z106

04  2 00 59 2025 -20.4 -173.7 5.0 SE OF PANGAI TONGA             M97 T0 Z31

04  2 00 42 2025  40.4 -125.0 3.3 WNW OF PETROLIA CA             M107 T75 Z106

04  2 00 29 2025 -56.9 -142.2 6.3 PACIFIC-ANTARCTIC RIDGE"       M125 T43 Z32

04  2 00 22 2025   3.2   97.5 4.4 SE OF BLANGPIDIE INDONESIA     M18 T89 Z77

04  2 00 20 2025 -10.2  161.4 4.5 KIRAKIRA SOLOMON ISLANDS       M71 T25 Z36

04  2 00 19 2025  28.5   87.1 4.3 NNE OF LOBUCHE NEPAL           M10 T107 Z103

04  2 00 01 2025  41.2 -116.7 3.5 KM NE OF VALMY                 M110 T80 Z111

04  1 23 59 2025  26.0  128.6 5.0 ESE OF KATSUREN-HAEBARU JAPAN  M30 T72 Z79

04  1 23 58 2025  37.7 -122.0 2.9 WNW OF DUBLIN CA               M110 T75 Z105

04  1 23 54 2025  27.4  142.7 4.6 BONIN ISLANDS JAPAN REGION"    M42 T63 Z76

04  1 23 23 2025  36.6   70.7 4.6 SSW OF JURM AFGHANISTAN        M26 T121 Z118

04  1 23 06 2025  41.2 -116.7 3.5 NEVADA                         M110 T80 Z111

04  1 22 04 2025  43.5  146.4 4.1 SW OF SHIKOTAN RUSSIA          M46 T73 Z91

04  1 21 29 2025  32.4   70.0 4.1 GULISHAH KACH PAKISTAN         M25 T122 Z116

04  1 19 47 2025  20.9 -154.9 3.0 NNE OF LAUPāHOEHOE HAWAII     M98 T44 Z75

04  1 19 44 2025  35.3 -117.8 2.6 WSW OF JOHANNESBURG CA         M114 T76 Z106

04  1 18 46 2025 -18.2 -177.8 4.6 FIJI REGION"                   M93 T4 Z31

04  1 17 17 2025  34.9 -104.2 3.0 NEWKIRK NEW MEXICO             M120 T85 Z114

04  1 17 09 2025  18.9  -68.9 3.1 MICHES DOMINICAN REPUBLIC      M136 T109 Z127

04  1 17 05 2025  31.7 -104.3 2.5 WHITES CITY NEW MEXICO         M123 T84 Z112

04  1 16 58 2025  64.0  -22.3 4.6 SE OF VOGAR ICELAND            M81 T132 Z162

04  1 16 57 2025  63.7  -22.6 4.9 SSW OF GRINDAVíK ICELAND      M82 T132 Z162

04  1 16 54 2025  64.0  -22.3 5.2 ESE OF VOGAR ICELAND           M81 T132 Z162

04  1 16 51 2025  36.5 -114.0 2.0 KM S OF SCENIC                 M115 T79 Z109

04  1 15 44 2025  63.1 -150.4 3.7 SOUTHERN ALASKA                M80 T85 Z114

04  1 15 27 2025  20.1   96.1 4.8 PYI TAW BURMA (MYANMAR)        M1 T96 Z91

04  1 15 25 2025  -4.5  124.0 4.4 ENE OF KATOBU INDONESIA        M38 T62 Z55

04  1 15 24 2025 -35.7  179.4 4.5 HICKS BAY NEW ZEALAND          M97 T16 Z14

04  1 15 07 2025  36.1 -116.3 3.0 NNW OF SHOSHONE CA             M114 T78 Z107

04  1 13 59 2025 -25.3  178.3 5.0 THE FIJI ISLANDS               M92 T8 Z23

04  1 13 52 2025  36.0   30.4 4.2 S OF BEYKONAK TURKEY           M57 T153 Z145

04  1 13 24 2025  31.5 -115.6 2.2 SAN VICENTE MEXICO             M118 T75 Z105

04  1 13 09 2025 -22.2 -179.2 4.7 THE FIJI ISLANDS               M93 T5 Z27

04  1 13 03 2025  32.1 -117.5 2.4 ROSARITO B.C. MX               M117 T75 Z104

04  1 12 33 2025  36.1  139.8 4.4 SSW OF SAKAI JAPAN             M40 T71 Z85

04  1 12 08 2025  36.9   77.2 4.3 SSE OF DAMUSI CHINA            M21 T116 Z114

04  1 11 26 2025  22.7  122.6 4.3 HUALIEN CITY TAIWAN            M24 T75 Z79

04  1 11 01 2025  22.1   96.0 5.0 MANDALAY BURMA (MYANMAR)       M0 T97 Z93

04  1 10 15 2025  -7.6  128.6 5.7 LOSPALOS TIMOR LESTE           M43 T56 Z50

04  1 10 13 2025  31.7 -104.3 2.0 WHITES CITY NEW MEXICO         M123 T84 Z112

04  1 09 30 2025  18.2  -64.8 3.1 BAY U.S. VIRGIN ISLANDS        M135 T113 Z129

04  1 09 25 2025  13.6  120.9 4.9 SE OF TINGLOY PHILIPPINES      M25 T72 Z72

04  1 08 50 2025  31.7 -104.3 2.3 WHITES CITY NEW MEXICO         M123 T84 Z112

04  1 08 38 2025  19.0  -67.1 3.1 ISABELA PUERTO RICO            M135 T111 Z128

04  1 06 05 2025 -46.1  -14.2 5.1 SOUTHERN MID-ATLANTIC RIDGE"   M119 T111 Z87

04  1 05 41 2025  42.9  146.0 4.1 SSE OF NEMURO JAPAN            M46 T72 Z90

04  1 04 17 2025  34.8   32.7 3.1 WNW OF PáCHNA CYPRUS          M56 T152 Z143

04  1 04 09 2025  58.1 -156.3 3.3 ALASKA PENINSULA               M80 T79 Z108

04  1 04 08 2025  58.1 -156.4 3.9 ALASKA PENINSULA               M80 T79 Z108

04  1 04 04 2025  58.1 -156.4 5.1 ALASKA PENINSULA               M80 T79 Z108

04  1 04 01 2025  39.8 -123.6 2.5 NNW OF LAYTONVILLE CA          M108 T75 Z106

04  1 02 58 2025  31.7 -104.3 2.1 WHITES CITY NEW MEXICO         M123 T84 Z112

04  1 02 31 2025  -5.1  149.8 4.5 KIMBE PAPUA NEW GUINEA         M59 T38 Z43

04  1 02 16 2025  -8.3  117.8 5.0 ENE OF POTOTANO INDONESIA      M36 T66 Z56

04  1 02 04 2025   4.7  -76.1 4.6 SE OF ARGELIA COLOMBIA         M152 T98 Z112

04  1 00 09 2025  79.8    1.0 4.6 GREENLAND SEA"                 M69 T120 Z146

 

 

 

 

April  1, 2025

 

An eruption of Grindavik Volcano in Iceland is deemed imminent by local authorities. It has been preceded by

an energetic swarm of earthquakes across much of southwestern Iceland. 

Lava has begun to flow near Reykjavik, Iceland's capital  and many local communities

have been evacuated. The famous Blue Lagoon Spa and the town of Frindavik have been

evacuated. Shortly after the evacuatioins and while this issue was going to press,

the volcano did erupt with flames and smoke and flowing lava. The open fissure

is continuing to extend to the south. Damag to a hot water pipeline in northern

Grindavik was reported. The eruption began about 06:30 UT

This epicenter is at the ninth node from Myanmar and at the third node (120 degrees)

from TC Courtney and may have been promoted by energy from those sources.

 

A pair of moderate earthquakes also occurred today within minutes of local solar midnight in the Greenland Sea and Jan Mayen areas.

These were not reported felt in this area. The epicenters of these earthquake

is located near the point of maximum eclipse with the solar eclipse of March 29

and had been expected to see enhanced seismicity near Greenland and Iceland at this time in this summary as:

 

"The new moon will arrive on March 29, 2025 at 10:58 UT.  This is a partial solar eclipse which will be visible in portions of the northeastern U.S, Eastern Canada, Greenland, north Atlantic, Europe, and Africa. Longitudes which are at local solar noon at the peak of this eclipse are near 15 East while those at local solar midnight are near 165 West. In the east these include areas of central Europe including Mt. Etna and Stromboli in Italy and the areas of Iceland and the Reykjanes Ridge and Greenland in the north Atlantic and portions of northeastern U.S, with maximum near Portland Maine at sunrise on March 29 and in the west the central and western Aleutians and Hawaii. Regions in the southern Hemisphere including Tonga, Samoa and Fiji and the South Sandwich Islands in the South Atlantic may also see tidal enhancement. These regions may see significant seismic enhancements with this new moon and partial solar eclipse. Other areas where fluids are involved in seismicity may also see increased seismicity near local solar noon or midnight. The chances of a tidally-related strong to major earthquake during the next week is considered to be high." (March 23-30, 2025)

 

The last earthquake of M>=4.6 within about 200 km of today's epicenters near

Greenland occurred as an M 5.7 on November 20, 2024. Today's activity in the

Greenland Sea is at the third node (120 degrees) from the M 7.1 in Tonga of

March 30 and may have been promoted by energy from that source.

 

 

The strongest earthquake in the world today was an M 5.7-6.3 in Timor, Banda Sea, Indonesia. NEIC reported it was felt with intensity III i Dili, East Timor and in the Northern Territory of Australia at Conawarra and Darwin with intensity II-III.

This epicenter is at the eighth node (45 degrees) from the Myanmar quake of

March 28 and may have been promoted by energy from that source.

BMG gave the following data for this event:

 

 

O: 01APR2025 10:15:54  7.7S 128.6E ML=6.3  BMG    Timor, Indonesia

 

 

An M 5.6-6.1 also occurred today in the Sumba region of Indonesia. NEIC reported it was felt with intensity III in Ruteng Nusa, Timur and in Waingapu with intensity II.

This epicenter is at the ninth node (40 degrees) from the Myanmar quake of

March 28 and may have been promoted by energy from that source.

BMG gave the following data for this event:

 

 

O: 31MAR2025 15:54:20 10.0S 119.0E ML=6.0  BMG    Sumba, Indonesia

 

The strongest earthquake in the U.S. or Canada today was an M 5.1 in the Alaska Peninsula

area. NEIC reported it was felt with maximum intensity IV in Pilot Point, Alaska with III in North Lake and Peninsula Borough, Clarks Point, Iliamna, King Salmon, Levelock, Manokotak, Naknek, Nondalton, Port Alsworth, South Naknek.

Several aftershocks of moderate magnitude were also felt in the Egegik area of Alaska.

This epicenter is located at the ninth node (80 degrees) from both the M 7.7

in Myanmar of March 28 and the M 7.1 in the Loyalty Islands of March 30

and was probably promoted by constructive interferencee of energy from

these two sources. An M 8+ earthquake, one of the largest events in the history

of this area occurred on November 10, 1938 two days after a lunar eclipse of November 7, 1938.

It is likely the area is sensitive to soli-lunar alignment tidal stresses

and could have been promoted by this with the eclipse of March 29.

 

The last earthquake in the Alaska Peninsula within about 250 km of today's

epicenter with M>=5.1 occurred on April 28, 2022 with M 5.2. At the time this

summary noted:

 

"The strongest earthquake in the U.S. or Canada today was an M 5.2-5.4 in the Alaska Peninsula. NEIC reported it was felt with intensity II-III in Perryville, Kodiak, Manokotak and Anchorage, Alaska.

While an M 5.3 ocurred within about 200 km of today's event on February 20, 2022

the last event of significantly larger magnitude was an M 6.9 on October 31, 2021.

Today's event is probably the largest aftershock of that event to date." (April 28, 2022)

 

 

Preliminary expectations for far field triggering from Tonga (will be revised)

 

Antipodal (~180 degrees)

 

Tonga to Morocco, 

 

Outer shadow zone edge (141-148 degrees)

 

Tonga to mid-Atlantic, Iran, Lebanon, Iceland, Azores, Turkey,  Mid-Atlantic, Reykjanes Ridge, 

 

Node 3 (120 degrees)

 

Tonga to Greenland, Quebec, Tajikistan, Maine, Pakistan, Afghanistan, South Africa 

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

 

Tonga to South Indian Ocean, Nepal, Mississippi, Ohio, Northern Peru, Colombia, South of Africa, South Sandwich Islands, Bay of Bengal, Northern Missouri, Colombia, Bouvet Island, South Carolina, Alberta, Beaufort Sea, South of Africa, Georgia, Illinois, Louisiana, British Columbia, Canada,  Central Chile,  Myanmar, 

 

Node 4 (90 degrees)

 

Tonga to Eastern Mexico, Guatemala, Texas, South Indian Ridge, South Atlantic, South Sandwich Islands, Texas, Colorado, Idaho, Denali, Montana, British Columbia, Yukon Territory, Canada, Guatemala, Sichuan, China, Sumatra,   

 

Node 5 (72 degrees)

 

Tonga to Coast of Northern California, Baja California, Rat Islands, Fox Islands, Andreanof Islands, Kuril Islands,  South of Sumatra, Coast of Oregon,  Honshu, Japan, Philippines, 

 

Node 6 (60 degrees)

 

Tonga to Molucca, Minahasa, Java, East Pacific Rise, New Guinea,

 

Node 7 (52 degrees)

 

Tonga to East Pacific Rise, South of Australia, Western Australia, New Guinea, Mariana Is, 

 

 

NEIC reported an earthquake of M 5.0 in Myanmar was felt with  intensity up to II-III in the area(s) of Myanmar in Sagaing.

EMSC reported moderate shaking in Mandalay and Patheingyi, Myanmar for this and an earlier M 4.4.

 

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 Leggett.

 

NEIC reported an earthquake of M 4.6 in Colombia was felt with  intensity up to II-III in the area(s) of Colombia at Cali Valle del Cauca.

EMSC reported light to moderate shaking in Colombia at Pereira, Santiago De Cali, San Gil.

 

NEIC reported an earthquake of M 4.0 in Qatar was felt with  intensity up to II-III in the area(s) of Qatar at Doha and al-Wakrah.

 

NEIC reported an earthquake of M 4.0 in Northern Nevada was felt with  intensity up to II-III in the area(s) of Northern Nevada at Glenbrook. 

 

NEIC reported an earthquake of M 4.6 in Sind, Pakistan was felt with  intensity up to II-III in the area(s) of Sind, Pakistan in Karachi and Khanpur.

EMSC reported moderate shaking in Karachi, Pakistan.

 

EMSC reported an earthquake of M 4.2 in Kyrgyzstan was felt with  intensity up to IV in the area(s) of Kyrgyzstan at Bishkek, Almaty Kazakhstan, 

 

 

TROPICAL CYCLONE COURTNEY (27S)                  

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    COURTNEY 2025-04-01  00:00 UT  25.0S   88.4E  055 kts  South Indian Ocean

 

Tropical Cyclone Courtney (27S) continued today in the area of the southern Indian Ocean south of Sumatra, Indonesia with winds up to 055 kts.  It is expected to stall and dissipate in the next day. Some enhanced seismicity in the areas of Java and Sumatra, Indonesia while this storm is active. The antipode is near 24N 92W in the Gulf of America and is not an active seismic area.

 

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

2440       0034   0041      0048   C5.5      (March 31, 2025)   4.1E-03  

2450       0218   0235      0244   C8.9      (March 31, 2025)   1.0E-02  

Indiana M 2,4 02:18 UT

Northern Alaska M 3.8 02:55 UT

 

2460       0311   0317      0320   C5.8      (March 31, 2025)   4.7E-03  

2490       0320   0330      0336   C6.5      (March 31, 2025)   6.1E-03  

Channel Is, California M 3.3 03:28 UT

 

2470       0344   0352      0356   C7.6      (March 31, 2025)   4.3E-03  

Channel Is, California M 2.0 03:50 UT

 

2480       0505   0508      0512   C4.7      (March 31, 2025)   1.8E-03  

Myanmar M 4.5 05:17 UT

 

2510       0715   0729      0737   C2.6      (March 31, 2025)   9.9E-04  

Kyrgyzstan M 4.2 07:25 UT

 

2520       0737   0741      0747   C2.4      (March 31, 2025)   1.5E-03  

Cuba M 3.7 07:45 UT

 

2540       0925   0928      0934   C2.4      (March 31, 2025)   1.0E-03  

So. California M 2.0 09:26 UT

Fiji M 4.8 09:42 UT

 

2550       0957   1007      1016   C3.1      (March 31, 2025)   9.6E-04  

2570       1016   1024      1037   M1.2      (March 31, 2025)   1.1E-02  

2580       1200   1208      1213   C4.4      (March 31, 2025)   2.5E-03  

Izu Is M 4.4 12:09 UT

Nevada M 3.4 12:03 UT

 

2590       1229   1240      1250   C2.5      (March 31, 2025)   2.8E-03  

2600       1409   1413      1421   C2.2      (March 31, 2025)   1.5E-03  

2650       1631   1637      1641   C4.4      (March 31, 2025)   1.8E-03  

2660       1713   1722      1734   C3.5      (March 31, 2025)   3.7E-03  

2670       1736   1742      1744   C4.1      (March 31, 2025)   2.1E-03  

2710       1744   1750      1800   C6.0      (March 31, 2025)   5.4E-03  

Antofagasta M 4.4 17:49 UT

 

2730       2141   2148      2152   C2.6      (March 31, 2025)   1.4E-03  

2770       2300   2304      2312   C2.2      (March 31, 2025)   1.4E-03  

2780       2337   2345      2351   C3.2      (March 31, 2025)   2.5E-03  

Indonesia M 4.0 23:42 UT

Greenland Sea M 4.6 00:09 UT

 

 

* indicates analog reading from graph provided by SWPC

 

GEOMAGNETIC FIELD:  unsettled April 1-2 quiet April 3.  Solar M-flare chance: 75% X-class: 25% proton storm: 80%

 

AP Indicies (global, high, mid-latitude, time of max AP, Max AP, Sunspot Number, Radio Flux)     6  6  8 12:00 4  151 172

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:37:40 UT (#250331C).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 31, 2025 at 04:19:43 UT (#250331B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 30, 2025 at 06:07 38 UT (#250330A).  A preliminary UVOT Magnitude was assigned to this GRB at V>20.0.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 27, 2025 at 07:30:04 UT (#250327A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 22, 2025 at 16:06:12 UT (#250322A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 21, 2025 at 00:42:38 UT (#250321A).  A preliminary UVOT Magnitude of V>18.9 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 12, 2025 at 13:24:17 UT (#250312A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

Earthquake associated with this flare included an M 2.2 in Central California;

an M 4.7 in Halmahera, Indonesia and an M 2.6 in New South Wales, Australia.

 

A strong Gamma Ray Burst was recorded by SWIFT on March 6, 2025 at 16:30:08 UT (#250306A).  A preliminary UVOT Magnitude  was not assigned to this GRB.

The strongest earthquake in the world in the past month (since February 8, 2025) coincided with this GRB - an M 6.1 on March 6 at 16:22 UT and was possibly promoted by this GRB.

An aftershock of this of M 4.7 in Antofagasta, Chile occurred at 16:33 UT on March 6.

The area of Chile was nearly exactly sub-solar at the time of this GRB and

earthquake.

 

A strong Gamma Ray Burst was recorded by SWIFT on February 25, 2025 at 19:39:13 UT (#250225B).  A preliminary UVOT Magnitude  was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on February 21, 2025 at 03:34:37 UT (#250221A).  A preliminary UVOT Magnitude  of V=17.10 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on February 7, 2025 at 01:16:07 UT (#250207A).  A preliminary UVOT Magnitude  of V=16.89 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on January 29, 2025 at 04:45:09 UT (#250129A).  A preliminary UVOT Magnitude  of V=17.24 was assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on January 28, 2025 at 16:22:53 UT (#250128B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on January 14, 2025 at 07:33:19 UT (#250114A).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

A strong Gamma Ray Burst was recorded by SWIFT on January 8, 2025 at 10:23:06 UT (#250108B).  A preliminary UVOT Magnitude was not assigned to this GRB.

 

The current earthquakes map contains expected distances at which enhanced seismicity is

likely at this time due to expected geomagnetic storms (stippled lines) and Earthquakes during the past day as

reported by NEIC (colored circles). Nodal positions around TC 27S  and TC 28S (Dianne) are identified

by pink stipples.

 

 

DISTANCE RELATIONS FROM MYANMAR MARCH 29, 2025

 

Possible far-field triggering areas from the great quake of M 7.7-8.0 in

Myanmar, Southeast Asia of March 28, 2025 follow.

The magnitude of the mainshock (M 7.7-8.0) suggests extensive far-field

activity is likely with the probability of several strong far-field

earthquakes in the next week especially near the time of the eclipse of March 29.

The earthquake in Myanmar is at the fourth node (90 degrees) from the

epicenter of the M 6.8 in New Zealand of March 25 and was likely promoted

by energy from that source.

 

 

Antipodal (~180 degrees)

 

Myanmar to East Pacific Rise

 

Outer shadow zone edge (141-148 degrees)

 

Myanmar to Magallenes, Chile, Nicaragua, Northeast Pacific Rise, Eastern Mexico, Guatemala,  

 

Node 8 (135 degrees)

 

Myanmar to Leeward Is, Virgin Is, Michoacan, Mexico,

 

Node 3 (120 degrees)

 

Myanmar to North Atlantic, Central Mid-Atlantic, Ohio, Oklahoma, SE U.S. including Tennessee and Georgia, Baja California, Northern Gulf of Mexico, South Atlantic, 

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

 

Myanmar to South of Africa, Washington, Oregon States, British Columbia, Alberta, Nunavit, Quebec, Eastern Canada, Montana, Central Mid-Atlantic, Northern,  Kermadec Islands, Hawaii 

 

Node 4 (90 degrees)

 

Myanmar to Fiji, Tonga, SE Alaska, Greenland, Baffin, South Island, New Zealand, Reykjanes Ridge, Madeira Islands,

 

Node 5 (72 degrees)

 

Myanmar to Andreanof Islands, Solomon Is, Northern France, Germany, Libya, Central Italy, 

 

Node 6 (60 degrees)

 

Myanmar to Western Turkey, Ukraine, SW Australia, Kamchatka/Komandorsky Is, Crete, Greece, New Guinea,

 

Node 7 (52 degrees)

 

Myanmar to Eastern Turkey, Syria, Ethiopia, Kuril Is, Papua New Guinea, Guam, 

 

Node 8 (45 degrees)

 

Myanmar to Caucasus, Central Indonesia, Hokkaido, 

 

 

EARTHQUAKE LISTING

 

Listed are the NEIC locations for earthquakes of M>=2.5 during the past day in

reverse chronological order. 

 

MO DA HR MN YEAR  LAT   LONG  MAG GEOGRAPHIC LOCATION

 

                  N+S-  E+W-

04  1 11 01 2025  22.1   96.0 5.0 MANDALAY BURMA (MYANMAR)     

04  1 10 15 2025  -7.6  128.6 5.7 LOSPALOS TIMOR LESTE         

04  1 09 25 2025  13.6  120.9 4.9 SE OF TINGLOY PHILIPPINES    

04  1 08 50 2025  31.6 -103.3 2.3 WHITES CITY NEW MEXICO        

04  1 08 38 2025  19.0  -67.1 3.1 ISABELA PUERTO RICO          

04  1 06 05 2025 -46.1  -14.2 5.1 SOUTHERN MID-ATLANTIC RIDGE" 

04  1 05 41 2025  42.9  146.0 4.1 SSE OF NEMURO JAPAN          

04  1 03 09 2025  58.1 -156.3 3.3 ALASKA PENINSULA             

04  1 03 08 2025  58.1 -156.4 3.9 ALASKA PENINSULA             

04  1 03 04 2025  58.1 -156.4 5.1 ALASKA PENINSULA             

04  1 03 01 2025  39.8 -123.6 2.5 NNW OF LAYTONVILLE CA        

04  1 02 58 2025  31.6 -103.3 2.1 WHITES CITY NEW MEXICO       

04  1 02 31 2025  -5.1  149.8 4.5 KIMBE PAPUA NEW GUINEA       

04  1 02 16 2025  -8.3  117.8 5.0 ENE OF POTOTANO INDONESIA    

04  1 02 03 2025   4.7  -76.1 4.6 SE OF ARGELIA COLOMBIA       

04  1 00 09 2025  79.8    1.0 4.6 GREENLAND SEA"               

03 31 23 56 2025  41.2 -116.7 2.6 KM NE OF VALMY               

03 31 23 26 2025  37.6   72.2 4.1 ENE OF KHORUGH TAJIKISTAN    

03 31 22 56 2025  63.1 -150.9 3.0 KM SE OF DENALI              

03 31 22 35 2025 -23.2  179.6 4.9 THE FIJI ISLANDS             

03 31 22 25 2025  -4.7  153.2 4.5 KOKOPO PAPUA NEW GUINEA      

03 31 20 42 2025  24.4   50.3 4.0 UMM BāB QATAR               

03 31 20 23 2025  35.4 -117.8 2.2 W OF JOHANNESBURG CA         

03 31 20 07 2025  19.5  -65.9 3.3 SAN JUAN PUERTO RICO         

03 31 19 56 2025  41.2 -116.7 2.5 KM NE OF VALMY               

03 31 19 35 2025  41.2 -116.7 2.0 KM NE OF VALMY               

03 31 19 11 2025  21.9   96.0 4.1 SAGAING BURMA (MYANMAR)      

03 31 17 49 2025 -21.6  -68.7 4.4 SW OF OLLAGüE CHILE         

03 31 17 49 2025  18.6  -65.8 3.0 SUáREZ PUERTO RICO          

03 31 17 29 2025  41.2 -116.7 2.9 KM NE OF VALMY               

03 31 17 22 2025  36.7 -121.1 2.8 NNE OF PINNACLES CA          

03 31 16 46 2025  41.2 -116.7 2.3 KM NE OF VALMY               

03 31 16 28 2025  41.2 -116.7 4.0 KM NE OF VALMY               

03 31 16 24 2025  41.2 -116.7 2.6 KM NE OF VALMY               

03 31 15 58 2025 -23.7  -66.8 4.5 DE LOS COBRES ARGENTINA       

03 31 15 54 2025 -10.1  119.0 5.6 SSW OF TAMBOLAKA INDONESIA   

03 31 15 06 2025 -52.2   28.0 4.7 SOUTH OF AFRICA"             

03 31 15 02 2025  40.5 -124.2 2.9 SW OF FORTUNA CA             

03 31 13 36 2025   0.7  -29.7 5.2 CENTRAL MID-ATLANTIC RIDGE"  

03 31 13 20 2025 -20.5 -173.8 4.9 SE OF PANGAI TONGA           

03 31 12 31 2025  41.9 -119.5 2.2 E OF FORT BIDWELL            

03 31 12 14 2025 -25.7  -71.1 4.3 WSW OF TALTAL CHILE          

03 31 12 03 2025  41.2 -116.7 3.4 KM NE OF VALMY               

03 31 11 29 2025  33.7 -116.8 2.1 SSW OF IDYLLWILD CA          

03 31 11 12 2025  -4.6  139.4 4.6 NE OF AGATS INDONESIA        

03 31 11 10 2025  25.7   67.3 4.6 ESE OF UTHAL PAKISTAN        

03 31 09 42 2025 -22.5 -179.5 4.8 THE FIJI ISLANDS             

03 31 08 47 2025  41.9 -119.6 2.6 E OF FORT BIDWELL            

03 31 07 40 2025  40.2 -124.1 2.8 SSE OF PETROLIA CA           

03 31 07 40 2025  31.7 -103.3 2.8 WHITES CITY NEW MEXICO       

03 31 07 40 2025  31.7 -103.3 2.2 WHITES CITY NEW MEXICO       

03 31 06 58 2025  51.9  178.4 4.2 ISLANDS ALEUTIAN ISLANDS ALASK

03 31 05 59 2025 -17.7  -69.7 4.5 ENE OF PALCA PERU            

03 31 05 38 2025  -9.6  119.1 4.5 SW OF TAMBOLAKA INDONESIA    

03 31 03 50 2025 -11.2  -74.1 4.3 PUERTO OCOPA PERU            

03 31 03 50 2025  33.8 -118.7 2.0 SSE OF MALIBU CA             

03 31 03 43 2025  33.8 -118.8 2.0 S OF MALIBU CA               

03 31 03 32 2025  31.7 -103.4 2.1 WHITES CITY NEW MEXICO       

03 31 03 27 2025  33.8 -118.7 3.4 SSE OF MALIBU CA             

03 31 03 03 2025  19.3  -67.1 3.4 ISABELA PUERTO RICO          

03 31 02 55 2025  67.2 -142.5 3.8 NORTHERN ALASKA              

03 31 02 18 2025  38.5  -87.7 2.4 MOUNT CARMEL ILLINOIS        

03 31 02 05 2025  63.1 -151.4 3.7 KM SSE OF DENALI             

03 31 01 21 2025  -7.2   68.1 4.5 CHAGOS ARCHIPELAGO REGION"