QUIET DAY SEES MODERATE EVENTS IN TANZANIA AND NORTH ISLAND, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR AUGUST 19, 2019

 

It was an unusually quiet day in global seismicity today. No earthquakes of M>=4.8 were located in the world. This may be due to the lack of seismic promoters at this time - no major oceanic cyclones, geomagnetic storms or tidal events. A promoter, like a catalyst, causes an event to be brought forward in time by providing conditions which are more conducive to enhanced seismicity. The strongest earthquakes of the day occurred in Indonesia, Tanzania, Nicaragua and North Island New Zealand with M 4.6-4.8.

 

An unusual earthquake of M 4.6 occurred today in Tanzania.  NEIC reported this earthquake of M 4.8 in Tanzania  was felt with intensity II-III in the area(s) of Tanzania in Arusha, Moshi, Kilimanjaro and in Nairobi, Kenya. This is the strongest earthquake within about 250 km of this epicenter with M>=4.6 since an M 5.1 on July 13, 2016. Forecast 117953 had expected today's event was likely around August 16. This epicenter is at 103 degrees from the M 6.8 in Chile of August 1 and was probably promoted by energy from that source.

 

O: 20AUG2019 06:54:59   4.2S   36.7E mb=4.6  EMSC   TANZANIA                     

P: 16AUG2019 117953     5.0S   36.0E 4.0-5.3 BAAAA  Indian Ocean               

 

The event in North Island, New Zealand was reported widely felt in southern North Island. NEIC reported this earthquake of M 4.3-4.7 in North Island, New Zealand was felt with intensity II-III in the area(s) of Palmerston North, New Zealand. GEONET reported this earthquake of M 4.7 was felt with light intensity northeast of Whanganui and in southeastern North Island. More than 3563 people reported feeling this earthquake. Light to moderate intensity was reported throughout much of southern and eastern North Island and northern South Island. 1920 reports of weak intensity; 1480 of light intensity; 142 with moderate; 16 with strong shaking and 1 with severe and 4 with extreme intensity. The last earthquake with M>=4.7 within about 150 km of this epicenter in North Island was an M 4.7 on November 4, 2018 with the last of larger magnitude an M 5.9 on November 22, 2016.  Forecast 118142 had expected this event in this are was likely around August 19.

 

O: 19AUG2019 07:28:47  40.6S  176.0E mb=4.3  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 19AUG2019 07:28:47  40.5S  175.9E MS=4.7  GEONET Felt with light intensity

P: 19AUG2019 118142    39.0S  176.0E 3.0-4.4 ABAAA  North Island, N.Z.         

 

STRONG QUAKE IN SAIPAN, MARIANAS PROBABLY PROMOTED BY TYPHOON KROSA

 

EARTHQUAKE SUMMARY FOR AUGUST 18, 2019

 

The strongest earthquake in the world today occurred as an M 5.9 in the northern Mariana Islands. NEIC reported it was felt with intensity II-III in San Roque and Garapan, Saipan, Northern Marianas; in Tinian MP and in Tamuning, Guam. Typhoon Krosa passed over this epicenter about a week ago and was probably a promotional factor in the enhancement of regional seismicity since that time. This summary had noted at the time:

 

"Typhoon KROSA (11W) continued today over the Volcano Islands with winds up to 105 kts. It is expected to track to the north and possibly to make landfall near Tokyo, Japan around August 15. Some seismic increases may be expected in the Mariana and Volcano Islands and later in eastern Honshu, Japan over the next several days. These areas are currently under a seismic watch through mid-August." (August 9-12, 2019)

 

A similar M 5.9 hit about 200 km northeast of this on October 26, 2018, a likely aftershock of an M 6.4 on August 28, 2018, the largest in the region since February, 2005. Tropical Storm Jebi was suggested as promotional factor in the August, 2018 event as:

 

"TS Jebi (TD 25W) continued today east of Guam with winds up to 45 kts. It is expected to track to the northwest reaching the Mariana and Volcano Islands around August 30-31. Seismicity is expected to be enhanced in these regions as Typhoon Jebi

passes through the region." (August 26-28. 2018)

 

Forecast 117986 had expected today's Mariana Islands activity to the south around August 17.

 

O: 18AUG2019 18:55:15  16.3N  146.6E mb=4.9  EMSC   ANATAHAN REG, N. MARIANA ISLAN

O: 18AUG2019 18:00:26  16.7N  146.3E mb=5.9  EMSC   ANATAHAN REG, N. MARIANA ISLAN

P: 17AUG2019 117986    14.0N  145.0E 4.0-5.4 ACAAA  So. Marianas/Guam          

 

Another moderate earthquake occurred in Kansas today. This event of M 4.1 was reported by NEIC to have been felt with intensity V in Hutchinson and South Hutchinson and in Arlington, Kansas. Intensity II-III was reported from Partridge, Nickerson, Haven, Buhler, Pretty Prairie, and Sterling, Kansas. This is probably an aftershock of the M 4.7 in Kansas which occurred August 16 and which was described at the time in this summary as:

 

"A moderate earthquake of M 4.7 was widely felt in Kansas today. NEIC reported this event was felt with maximum intensity VI in Hutchinson, Kansas and V in South Hutchinson and IV in Partridge, Nickerson, Buhler and II-III in Haven, Pretty Prairie, Arlington, Kansas. It was probably triggered by high tidal stresses associated with the full moon on August 15. Earthquakes in this section of the U.S. often occur within a couple of days of full and new moons as noted for example, in previous issues of this summary" (August 16, 2019)

 

 

"Today's earthquake of M 4.7 is the strongest in Kansas or Oklahoma since an M 5.0 on November 7, 2016 nearly three years ago. Forecasts 118042 and 118043 had expected today's activity was likely around August 16-17. This earthquake is located at 144 degrees from the M 6.8 in Sumatra of August 2 and was probably promoted by energy from that source." (August 17, 2019)

 

O: 18AUG2019 08:45:29  38.0N   98.0W Mw=4.1  EMSC   KANSAS                       

P: 16AUG2019 118043    37.0N   98.0W 2.0-4.1 AAAAA  Southern Plains            

P: 17AUG2019 118042    39.0N   99.0W 2.0-4.1 AAAAA  Southern Plains            

 

An unusual earthquake of M 4.7 hit the area northeast of Australia today continuing unusual seismicity to the north of Australia over the past month. The only similar or larger event within about 300 km of this epicenter east of

Australia in the past 30 years was an M 5.7 on August 18, 2016, exactly three years ago. When this 2016 earthquake occurred this summary noted the coincidence with TS Fiona and the full moon. As today's event also occurred new full moon, a tidal promotion may be implied. The summary from August 18, 2016 had noted in this regard:

 

"The strongest and most unusual earthquake in the world today was an M 5.7 in Queensland, Australia. This is the strongest earthquake ever recorded off northern Queensland within about 500 km of this epicenter. It was followed by a series of light aftershocks. Simultaneously with this earthquake, the first tropical storm in the Atlantic season came to life near the antipode of this earthquake. This summary has previously reported on the connection between strong tropical storms in the Atlantic and subsequent moderate earthquakes in or near Australia. This appears to be another example of this type of interaction. Another promoter of this event may have been tidal stresses as today is the full moon and the quake occurred near local solar noon." (August 18, 2016)

 

The 2016 quake was associated with a strong M 7.5 in the South Pacific near the South Sandwich Islands (see History section). Today’s event was also coincident with event of M 5.0 and 5.1 in the South Sandwich Islands which were at 103 degrees from the M 6.8 in Sumatra of August 2.

 

Today's epicenter is at 103 degrees from the July 6, 2019 M 7.1 in Central California. Seismicity often increases at this distance from large event, probably related to surface energy and today's event in Australia may have been promoted from

California.

 

O: 18AUG2019 11:38:41  21.0S  151.9E mb=4.7  EMSC   EAST OF AUSTRALIA            

 

MODERATE QUAKE SHAKES BURMA

 

EARTHQUAKE SUMMARY FOR AUGUST 17, 2019

 

The strongest earthquake in the world today was an M 5.3 in Myanmar/Burma. It was followed 14 minutes later by an aftershock of M 4.7. No major damage was reported with these quakes, but some minor, local damage is likely. These are located north of the Andaman and Nicobar Islands of India. The last earthquake within about 200 km of today's epicenters with M>5.3 occurred as an M 6.0 on January 11, 2018 and prior to that in April, 2013. Forecast 117964 had expected today's activity to the south in mid-August.

 

NEIC reported this earthquake of M 5.3 in Burma  was felt with intensity IV in Mandalay, Myanmar and in   Burma with intensity II-III in the area(s) of Tharrawaddy and Rangoon, Myanmar.

 

O: 18AUG2019 03:38:15  18.5N   94.6E mb=4.7  EMSC   MYANMAR                      

O: 18AUG2019 03:24:25  18.6N   94.7E Mw=5.3  EMSC   MYANMAR                      

P: 14AUG2019 117964    16.0N   93.0E 4.0-5.4 BCBAA  Andaman Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in the Alaska Peninsula near Unimak Island. The last earthquake within about 100 km of this epicenter with M>=4.3 was an M 4.4 on July 3, 2019 and prior to that an M 4.4 on April 8, 2019. The last of significantly larger magnitude in this region was an M 6.0 on December 31, 2018. Today's event is probably an aftershock of the December event.  Forecast 118097 had expected today's epicenter would be active within about 50 km around August 21.

 

O: 17AUG2019 20:33:44  54.2N  161.6W mb=4.3  EMSC   ALASKA PENINSULA             

P: 21AUG2019 118097    54.7N  161.2W 3.5-4.8 BAAAA  Unimak Islands, Aleutians  

 

MODERATE QUAKES OFF OREGON AND IN OKLAHOMA RELATED TO FULL MOON

 

EARTHQUAKE SUMMARY FOR AUGUST 16, 2019

 

The strongest earthquake in the U.S. or Canada today was an M 5.4 off the coast of Oregon. NEIC reported it may have been felt lightly in Oregon at Eugene and Medford and in Seattle, Washington. A foreshock to the southeast of the M 5.4 occurred earlier in the day near local solar midnight and may have been promoted by strong tidal stresses associated with the full moon. The last event with M>=3.9 near the foreshock occurred a month ago on July 17, 2019 and prior to that as an M 4.1 on June 26, 2019.  Both the event in June and July occurred with the full moon as noted at the time:

 

"It was also promoted by the full moon as noted in the previous summary" (July 18, 2019)

 

Forecast 117842 had expected today's event within about 100 km of the epicenter was likely around August 14.

 

O: 16AUG2019 07:27:00  43.1N  126.6W mb=3.8  EMSC   OFF COAST OF OREGON          

O: 16AUG2019 07:27:01  43.4N  126.9W MB=3.9  ECAN Eugene, Oregon, USA   

P: 10AUG2019 117842    43.9N  128.4W 3.0-4.3 CAAAA  Off Coast of Oregon        

 

The mainshock of M 5.4 about 250 km northwest of the foreshock was the strongest in this region since an M 5.9 on June 1, 2015. Forecasts 118067 had expected today's earthquake was likely within about 50 km of the epicenter around August 14. This earthquake is located at the third node (120 degrees) from the M 6.8 in Sumatra of August 2 and was probably promoted by energy from that source

 

O: 16AUG2019 15:23:19  44.3N  129.4W Mw=5.4  EMSC   OFF COAST OF OREGON          

P: 14AUG2019 118067    44.5N  129.8W 3.0-4.4 AAAAA  Off Coast of Oregon        

 

A moderate earthquake of M 4.7 was widely felt in Kansas today. NEIC reported this event was felt with maximum intensity VI in Hutchinson, Kansas and V in South Hutchinson and IV in Partridge, Nickerson, Buhler and II-III in Haven, Pretty Prairie, Arlington, Kansas. It was probably triggered by high tidal stresses associated with the full moon on August 15. Earthquakes in this section of the U.S. often occur within a couple of days of full and new moons as noted for example, in previous issues of this summary:

 

"As often occurs, Oklahoma saw enhanced seismic activity today with the strongest in a series of events of M 3.4. It is common for the area to become activated at times of full moons when tidal forces are strong and can affect ground water significantly. At M 3.4, this is the strongest earthquake within about 100 km of this epicenter since an M 3.4 on February 28 and an M 3.8 on February 26, 2019. Forecast 115982 had expected today's activity was likely within about 100 km of these epicenters around May 17." (May 16-17, 2019)

 

Today's earthquake of M 4.7 is the strongest in Kansas or Oklahoma since an M 5.0 on November 7, 2016 nearly three years ago. Forecasts 118042 and 118043 had expected today's activity was likely around August 16-17. This earthquake is located at 144 degrees from the M 6.8 in Sumatra of August 2 and was probably promoted by energy from that source.

 

O: 17AUG2019 06:21:03  38.0N   98.0W mb=2.0  EMSC   KANSAS

O: 16AUG2019 13:43:06  38.0N   98.0W mb=2.7  EMSC   KANSAS

O: 17AUG2019 01:03:37  38.0N   98.0W mb=3.0  EMSC   KANSAS

O: 16AUG2019 12:59:09  38.0N   98.0W mb=4.7  EMSC   KANSAS

O: 16AUG2019 13:30:56  38.0N   98.1W mb=2.6  EMSC   KANSAS

O: 16AUG2019 13:10:49  38.0N   98.1W mb=3.1  EMSC   KANSAS

O: 16AUG2019 19:55:41  38.1N   97.9W mb=2.5  EMSC   KANSAS

O: 17AUG2019 05:23:48  38.1N   98.0W mb=2.1  EMSC   KANSAS                        

P: 16AUG2019 118043    37.0N   98.0W 2.0-4.1 AAAAA  Southern Plains            

P: 17AUG2019 118042    39.0N   99.0W 2.0-4.1 AAAAA  Southern Plains            

 

NEIC reported this earthquake of M 3.0 in Kansas  was felt with intensity II-III in the area(s) of Kansas at Hutchinson and South Hutchinson, Osborne, Perry, and in Oklahoma at Tulsa and Oklahoma City.

 

UNUSUAL QUAKES SHAKE CENTRAL NORTH AMERICA

 

EARTHQUAKE SUMMARY FOR AUGUST 15, 2019

 

 

Moderate earthquakes of M 4.1 and 4.2 hit the region of north-central North America today. These events in Western Montana and Manitoba, Canada were lightly felt in their respective epicentral areas. An earthquake of M 3.3 also occurred in southeastern Yellowstone, Wyoming, the strongest in that region in more than 10 years.

 

The strongest earthquake in the world today was an M 5.5 in the southern Vanuatu Islands near the Loyalty Islands. It occurred near local solar noon and at the time of the full moon and was probably promoted by high tidal stresses associated with that alignment. This is not in the typical area of moderate

to large quakes in this area. The last event east of 172.5E with M>=5.5 occurred as an M 5.8 on November 25, 2017. Forecast 118130 had expected today's event in the area was likely around August 18. This summary had issued the tidal seismicity forecast in the past several issues as:

 

"The full moon arrives on August 15 at 12:29 UT. Longitudes which are anti-solar at this time include the Southwestern Pacific near 175 East and include the Fiji/Tonga/New Zealand area and the western Aleutians. In the west these longitudes are near 5 West and include western Europe and portions of the Mid-Atlantic Ridge. These area the areas most likely to see tidal triggering in the next week, but tidal triggering is common and can be recognized by the timing of earthquakes near local solar midnight and noon." (August 13-15, 2019)

 

O: 15AUG2019 10:38:32  20.7S  173.3E Mw=5.5  EMSC   VANUATU REGION               

P: 18AUG2019 118130    22.0S  169.0E 4.0-5.3 BBCAA  Loyalty Islands            

 

Moderate earthquakes of M 4.1 and 4.2 hit the region of north-central North America today. These events in Western Montana and Manitoba, Canada were lightly felt in their respective epicentral areas. The earthquake in western Montana of M 4.2 was accompanied by light shocks and was probably triggered by high tidal stresses associated with the full moon. These are part of a series of Western Montana quakes which have been occurring during August. The M 4.2 is the strongest in this area within about 100 km of these epicenters since an M 4.1 in the area on August 6, 2019 and an M 4.0 with the previous full moon on July 14, 2019. The last event of M>4.2 in the area was an M 5.8 and aftershocks on July 6, 2017. Forecast 118063 had expected today's event was likely around August 16.

 

NEIC reported this earthquake of M 4.2 in Western Montana  was felt with intensity IV in Montana at Three Forks, Manhattan, Belgrade and II-III in the area(s) of Western Montana at Bozeman, Radersburg, Pony, Gallatin,  Ennis,  and Whitehall. Foreshocks were felt with light intensity in the same area.

 

O: 16AUG2019 00:01:25  45.9N  111.4W ML=3.4  EMSC   WESTERN MONTANA              

O: 15AUG2019 23:41:27  45.9N  111.4W Ml=2.4  EMSC   WESTERN MONTANA              

O: 16AUG2019 00:02:37  45.9N  111.4W Mw=4.2  EMSC   WESTERN MONTANA              

P: 16AUG2019 118063    45.7N  112.1W 2.0-4.0 AAAAA  Montana/Idaho              

 

The earthquake in Manitoba, Canada occurred with M 4.1 about 2.5 hours after the M 4.2 in Montana. NEIC reported this earthquake of M 4.1 in Manitoba, Canada was felt with intensity II-III in the area(s) of Esterhazy, Saskatchewan, Canada. It was also likely promoted by high tidal stress accompanying the full moon. Two other earthquakes of M>=4 have hit within about 300 km of this epicenter in the past 30 years - an M 4.1 on February 1, 2012 and an M 4.4 on April 14, 2010.

 

O: 16AUG2019 02:30:46  50.7N  101.8W mb=4.1  EMSC   MANITOBA, CANADA             

 

An M 3.3 also occurred in southeastern Yellowstone, Wyoming today. It occurred within minutes of local solar noon a time when tidal stresses are greatest with the full moon. The M 3.3 is the strongest within about 50 km of this epicenter since an M 4.0 11 years ago on December 31, 2008.  Forecast 118079 had expected today's event within about 10 km of this epicenter was likely around August 21.

 

O: 15AUG2019 08:29:50  44.0N  110.3W Ml=2.0  EMSC   WYOMING                      

O: 15AUG2019 19:46:39  44.1N  110.4W ML=3.3  EMSC   WYOMING                      

P: 21AUG2019 118079    44.2N  110.3W 2.0-3.9 CAAAA  Yellowstone/Wyoming        

UNUSUAL QUAKES SHAKE CENTRAL NORTH AMERICA

 

EARTHQUAKE SUMMARY FOR AUGUST 15, 2019

 

 

Moderate earthquakes of M 4.1 and 4.2 hit the region of north-central North America today. These events in Western Montana and Manitoba, Canada were lightly felt in their respective epicentral areas. An earthquake of M 3.3 also occurred in southeastern Yellowstone, Wyoming, the strongest in that region in more than 10 years.

 

The strongest earthquake in the world today was an M 5.5 in the southern Vanuatu Islands near the Loyalty Islands. It occurred near local solar noon and at the time of the full moon and was probably promoted by high tidal stresses associated with that alignment. This is not in the typical area of moderate

to large quakes in this area. The last event east of 172.5E with M>=5.5 occurred as an M 5.8 on November 25, 2017. Forecast 118130 had expected today's event in the area was likely around August 18. This summary had issued the tidal seismicity forecast in the past several issues as:

 

"The full moon arrives on August 15 at 12:29 UT. Longitudes which are anti-solar at this time include the Southwestern Pacific near 175 East and include the Fiji/Tonga/New Zealand area and the western Aleutians. In the west these longitudes are near 5 West and include western Europe and portions of the Mid-Atlantic Ridge. These area the areas most likely to see tidal triggering in the next week, but tidal triggering is common and can be recognized by the timing of earthquakes near local solar midnight and noon." (August 13-15, 2019)

 

O: 15AUG2019 10:38:32  20.7S  173.3E Mw=5.5  EMSC   VANUATU REGION               

P: 18AUG2019 118130    22.0S  169.0E 4.0-5.3 BBCAA  Loyalty Islands            

 

Moderate earthquakes of M 4.1 and 4.2 hit the region of north-central North America today. These events in Western Montana and Manitoba, Canada were lightly felt in their respective epicentral areas. The earthquake in western Montana of M 4.2 was accompanied by light shocks and was probably triggered by high tidal stresses associated with the full moon. These are part of a series of Western Montana quakes which have been occurring during August. The M 4.2 is the strongest in this area within about 100 km of these epicenters since an M 4.1 in the area on August 6, 2019 and an M 4.0 with the previous full moon on July 14, 2019. The last event of M>4.2 in the area was an M 5.8 and aftershocks on July 6, 2017. Forecast 118063 had expected today's event was likely around August 16.

 

NEIC reported this earthquake of M 4.2 in Western Montana  was felt with intensity IV in Montana at Three Forks, Manhattan, Belgrade and II-III in the area(s) of Western Montana at Bozeman, Radersburg, Pony, Gallatin,  Ennis,  and Whitehall. Foreshocks were felt with light intensity in the same area.

 

O: 16AUG2019 00:01:25  45.9N  111.4W ML=3.4  EMSC   WESTERN MONTANA              

O: 15AUG2019 23:41:27  45.9N  111.4W Ml=2.4  EMSC   WESTERN MONTANA              

O: 16AUG2019 00:02:37  45.9N  111.4W Mw=4.2  EMSC   WESTERN MONTANA              

P: 16AUG2019 118063    45.7N  112.1W 2.0-4.0 AAAAA  Montana/Idaho              

 

The earthquake in Manitoba, Canada occurred with M 4.1 about 2.5 hours after the M 4.2 in Montana. NEIC reported this earthquake of M 4.1 in Manitoba, Canada was felt with intensity II-III in the area(s) of Esterhazy, Saskatchewan, Canada. It was also likely promoted by high tidal stress accompanying the full moon. Two other earthquakes of M>=4 have hit within about 300 km of this epicenter in the past 30 years - an M 4.1 on February 1, 2012 and an M 4.4 on April 14, 2010.

 

O: 16AUG2019 02:30:46  50.7N  101.8W mb=4.1  EMSC   MANITOBA, CANADA             

 

An M 3.3 also occurred in southeastern Yellowstone, Wyoming today. It occurred within minutes of local solar noon a time when tidal stresses are greatest with the full moon. The M 3.3 is the strongest within about 50 km of this epicenter since an M 4.0 11 years ago on December 31, 2008.  Forecast 118079 had expected today's event within about 10 km of this epicenter was likely around August 21.

 

O: 15AUG2019 08:29:50  44.0N  110.3W Ml=2.0  EMSC   WYOMING                      

O: 15AUG2019 19:46:39  44.1N  110.4W ML=3.3  EMSC   WYOMING                      

P: 21AUG2019 118079    44.2N  110.3W 2.0-3.9 CAAAA  Yellowstone/Wyoming        

 

CYCLONES TRIGGER QUAKES IN JAPAN; MEXICO

 

EARTHQUAKE SUMMARY FOR AUGUST 14, 2019

 

Two Tropical Cyclones have been active over the past several days. These were located in the area of Mexico near the Revilla Gigedo Islands and in Honshu, Japan making landfall on southern Honshu. The largest earthquakes in the world  were M 5.8-5.9 in the Mexican Revilla Gigedo Islands and an M 5.4 off the coast of Honshu, Japan. Coincidences such as this are major data supporting the hypothesis that such ocean storms can help trigger regional seismicity.

 

The strongest earthquake recorded in the world today was an M 5.8-5.9 off western Mexico in the Revilla Gigedo Islands region. NEIC reported it was felt with intensity III San Lucas, Baja California, Mexico. It may have been triggered by the passage of Tropical Storm Henriette which passed over this epicenter two days ago as noted in  this summary at the time:

 

TD    09E      2019-08-12  00:00 UT  18.7N  109.2W   40 kts  South of Western Mexico   

TS   HENRIETTE 2019-08-13  00:00 UT  20.5N  113.7W   45 kts  South of Western Mexico   

 

 

TS Henriette (TD 09E) continued today in the area south of Mexico with winds up to 40 kts. It is expected to track to the west and not to encounter land at this time. No seismic watch is likely with this storm." (August 11-13, 2019)

 

The last earthquake of M>=5.9 within about 200 km of today's epicenter in the Revilla Gigedo Islands, Mexico occurred as an M 6.3 on November 1, 2011. Forecasts 117968 and 117992 had expected today's event within about 50 km of the epicenter was likely around August 14-17. Earthquakes in this area can stress faults to the north, but as this was triggered by TS Henriette, this is much less likely to trigger additional seismicity in the Gulf of California. This epicenter is at 144 degrees from the M 6.8 in Sumatra of August 2 and may have been promoted from that source.

 

O: 14AUG2019 21:35:19  20.5N  109.2W Mw=5.9  EMSC   REVILLA GIGEDO ISLANDS REGION

P: 14AUG2019 117968    19.0N  109.0W 3.5-5.1 ABAAA  Coast of Jalisco, Mexico   

P: 17AUG2019 117992    20.0N  109.0W 3.5-4.8 BAAAA  Gulf of California         

 

A moderately strong earthquake today occurred as  an M 5.4 off the coast of eastern Honshu, Japan. It was reported with intensity V in Aomori; III in Iwate and II in Miyagi, Japan. This may have been triggered by the arrival in southern Japan of Typhoon Krosa as expected in previous issues of this summary:

 

Typhoon KROSA (11W) continued today west of the Bonin Islands, Japan with winds up to 65 kts. It is expected to track to the north and possibly to make landfall near Kyushu, Japan around August 15. Some seismic increases may be expected in the Mariana and Volcano Islands and later in western Honshu, Japan over the next several days. These areas are currently under a seismic watch through mid-August.

 

This is the strongest earthquake off northern Honshu within about 200 km of this epicenter since an M 5.4 on April 22, 2019. Two earthquakes in this region in the past year have exceeded this magnitude - an M 6.1 on April 11, 2019 and an M 5.7 on October 25, 2018. Forecasts 117827 and 118056 had expected this activity within this area was likely around August 10-15.

 

O: 15AUG2019 05:32:53  40.9N  141.2E Mw=5.4  EMSC   NEAR EAST COAST OF HONSHU, JAP

O: 15AUG2019 06:06:09  41.0N  141.1E mb=4.7  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 10AUG2019 117827    42.0N  142.0E 3.5-5.3 BAAAA  Hokkaido, Japan            

P: 15AUG2019 118056    41.0N  143.0E 3.5-5.3 AABAA  Hokkaido, Japan            

 

MODERATE QUAKE SHAKES SOUTHEASTERN ALASKA

 

EARTHQUAKE SUMMARY FOR AUGUST 13, 2019

 

The strongest earthquake in the U.S. or Canada today was an M 4.5-4.9 in Southeastern Alaska. NEIC reported it was felt with intensity II-III in Alaska at Gustavus and Douglas. This is the strongest in the current series of events in southeastern Alaska which began after the geomagnetic storm of August 5-6 and was reported in this summary at the time as:

 

"The activity off the coast of southeastern Alaska also continued today. This may have been promoted by the geomagnetic storm and included the largest event in the current swarm - an M 4.0. The last earthquake within about 200 km of today's epicenter with M>=4 occurred on September 21, 2017 (M 4.0) and before that on August 18, 2017 also with M 4.0. Forecast 117872 had expected today's activity was likely around August 5." (August 6-7. 2019).

 

"The geomagnetic field saw minor to major storm conditions today. The AP level was 35.  High latitude geomagnetic field saw major storm conditions  with AP at 61. This is the greatest disturbance in the geomagnetic field since AP reached 36 on May 14, 2019. The last storm of significantly larger AP occurred nearly a year ago on August 26, 2008 when AP reached 76 and high latitude AP was 90. Seismic increases are likely at high latitudes and within about 15 degrees of the geomagnetic equator beginning August 6 through August 11 due to triggering effects from this storm. The most likely timing of a strong to major event is August 10-12, the most likely regions - Indonesia and southeastern Alaska." (August 6-8, 2019)

 

The last earthquake within about 200 km of today's epicenter with M>=4.9 in Southeastern Alaska occurred two years ago on September 16, 2017, an M 5.1 aftershock of an M 6.3 of May 1, 2017. Forecast 1218086 had expected today's event was likely around August 15.

 

O: 14AUG2019 01:08:28  58.1N  137.7W Mw=4.5  EMSC   SOUTHEASTERN ALASKA          

O: 14AUG2019 01:08:35  58.4N  136.6W MB=4.9  ECAN OF JUNEAU, AK                  

P:  5AUG2019 117872    58.0N  136.0W 3.0-4.4 CAAAA  Southeast Alaska           

P: 15AUG2019 118086    58.3N  138.5W 3.0-4.9 AAAAA  British Colombia           

 

An earthquake of M 5.2 in the Bouvet Island Region of the South Atlantic occurred today. This is the strongest earthquake within about 200 km of this epicenter in the Bouvet Islands since an    M 5.3 on March 6, 2019. The last of significantly larger magnitude in the Bouvet area was an  6.5 on December 13, 2017. Forecast 118151 had expected this activity within about 100 km of this epicenter in mid-August. This epicenter is antipodal to the Rat Islands and the western Andreanof Islands in the Aleutians. A sympathetic antipodal moderate earthquake in this region may occur in the next several days.

 

O: 14AUG2019 03:02:26  54.7S    0.8W mb=5.2  EMSC   BOUVET ISLAND REGION         

P: 21AUG2019 118151    55.0S    2.0E 4.0-5.3 CABAA  Atlantic-Indian Ridge      

 

STRONG QUAKE SHAKES SOUTH ISLAND, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR AUGUST 12, 2019

 

The earth system was struck with stresses associated with end effects of a strong geomagnetic storm; an upcoming full moon which arrives at 12:29 UT on August 15; oceanic Storms; and distance effects from recent strong earthquakes. Together, these brought active seismicity pattern today. The geomagnetic effects were expected as:

 

"The geomagnetic field saw minor to major storm conditions today. The AP level was 24.  High latitude geomagnetic field saw active conditions  with AP at 12.  This is the greatest disturbance in the geomagnetic field since AP reached 36 on May 14, 2019.  The last storm of significantly larger AP occurred nearly a year ago on August 26, 2008 when AP reached 76 and high latitude AP was 90. Seismic increases are likely at high latitudes and within about 15 degrees of the geomagnetic equator beginning August 6 through August 11 due to triggering effects from this storm. The most likely timing of a strong to major event is August 10-12, the most likely regions - Indonesia, the Philippines the Southwest Pacific and Alaska." (August 6-7, 2019)

 

While seismicity possibly associated with the full moon was noted as:

 

"The full moon arrives on August 15 at 12:29 UT. Longitudes which are anti-solar at this time include the Southwestern Pacific near 175 East and include the Fiji/Tonga/New Zealand area and the western Aleutians. In the west these longitudes are near 5 West and include western Europe and portions of the Mid-Atlantic Ridge. These area the areas most likely to see tidal triggering in the next week, but tidal triggering is common and can be recognized by the timing of earthquakes near local solar midnight and noon." (August 12-13, 2019)

 

The largest earthquake in the world today was an M 5.4 in the area of South Island, New Zealand. NEIC reported maximum intensity V in Te Anau, Southland, New Zealand and IV in Ohai and in Otago at Queenstown and Arrowtown. It was also felt with intensity II-III in Wanaa, Mount Cook, Canterbury, Invercargill, Outram, Waitati and Dunedin, South Island. GEONET reported 6878 people felt this quake with 2755 with weak intensity; 3119 with light intensity and 883 with moderate intensity. 109 reported strong intensity, 5 severe shaking and 7 with extreme intensity. It was followed by a strong aftershock sequence with many felt light earthquakes. This activity is located at 103 degrees from the M 7.1 in Southern/Central California of July 6 and, as noted in the previous issue of this summary, was probably

promoted from that source:

 

 

"The strongest earthquake of the day occurred in South Island, New Zealand where an M 4.7-5.2 in South Island, New Zealand was widely felt today. GEONET reported this earthquake was felt with moderate intensity in northern South Island. 2100 people reported feeling this event;  1135 with weak intensity; 884 with light shaking; 76 moderate; 4 strong; 1 with severe and 0 with extreme shaking. NEIC reported this earthquake at M 4.7 in South Island, New Zealand was felt with intensity II-III in the area(s) of Mapua, Tapawera, Tasman and Nelson, South Island, New Zealand and in Wellington, North Island.  The last earthquake of M>=5.2 within about 150 km of today's epicenter occurred January 5, 2017 with M 5.4. It was probably a regional aftershock of the M 7.8 which hit the region on November 13, 2016. Forecast 117927 had expected today's event was likely around August 6-11. Southern New Zealand from Snares Island north became very active following the M 7.1 earthquake in Central California of July 6. This activation has included events up to M 6.7 and a number of moderate to moderately large quakes in the past month. The area lies near 103 degrees from the California epicenters and from the M 8.0 in Peru of May, 2019  and was probably promoted from those sources as previously proposed in this summary:

 

 

"California seismicity, especially around Southern California was enhanced today. Eight earthquakes outside the immediate Ridgecrest aftershock zone reach M>-3 magnitudes today in this area. One of the specialties of this summary, not generally available elsewhere is enhancement of seismicity at far-field distances. These generally include enhanced seismicity at nodal distances (51, 60, 72. 90, 103, 120, 144 and 180 degrees) from the epicenter of the major earthquake. ...  Those at or near 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying map by stippled white lines." (July 6, 2019), (August 11-12, 2019)

 

The last earthquake in the Te Anau area of New Zealand's South Island with M>=6.1 occurred more than 10 years ago in July and August, 2009 when an M 7.8 on July 15, 2009 was followed by an M 6.1 on August 5, 2009 about 150 km southwest of today's epicenter. Forecast 117928 had expected today's event within about 100 km of this epicenter was likely around August 7.

 

O: 12JUN2019 10:35:27  44.5S  167.9E ML=6.1  GEONET reported 6878 people felt this quake

O: 12AUG2019 10:35:28  44.6S  167.9E mb=5.5  EMSC   SOUTH ISLAND OF NEW ZEALAND  

P:  7AUG2019 117928    45.0S  167.0E 3.0-4.9 BAAAA  So. Island, N.Z.           

 

An M 4.8 in Western Australia also occurred today. It is south of the M 6.6 which hit the area in late July and is not part of the classic aftershock series which is continuing at a lower magnitude level. An M 4.4 occurred about 50 km east of this on June 15, 2019, but there have been no earthquakes of M>=4.8 within about 200 km of this epicenter in the past 30 years. It may have been triggered by the M 6.1 in South Island, New Zealand earlier in the day. Forecast 117915 had expected a moderate earthquake in the area in early August.

 

O: 12AUG2019 19:11:47  21.4S  120.5E ML=4.8  EMSC   WESTERN AUSTRALIA            

P:  6AUG2019 117915    19.0S  120.0E 2.0-3.3 CCAAA  Central Australia          

 

Two moderate earthquakes of M 4.9 and 5.2 also occurred in the Kermadec Islands at the north end of the New Zealand/Kermadec arc. These had been expected within about 100 km to occur around August 7.

 

O: 13AUG2019 01:45:50  31.4S  177.4W mb=4.9  EMSC   KERMADEC ISLANDS REGION      

O: 13AUG2019 06:35:01  31.6S  177.5W mb=5.2  EMSC   KERMADEC ISLANDS REGION      

P:  7AUG2019 117924    31.0S  179.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

 

An M 5.5 also occurred today off the coast of Chiapas, Mexico. NEIC reported this earthquake of M 5.5 in Chiapas, Mexico  was felt with intensity IV in Tuxtla Gutierrez; IV in Paraiso, Tabasco Bochil, Chiapas, Mexico and II-III in the area(s) of Chiapas, Mexico at Chiapa, San Cristobal de las Casas, Salina Cruz, Oaxaca, Villahermosa Tabasco, San Benito Peten, Guatemala, Belmopan and Belize, Belize. This is the strongest quake in Chiapas within about 200 km of this epicenter since an M 5.8 on January 21, 2019 and prior to that an M 5.5 on April 11, 2018. Forecast 117740 had expected a moderate quake in the area was likely around August 8.

 

O: 12AUG2019 09:25:58  14.9N   94.2W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO 

O: 12AUG2019 20:39:35  16.0N   93.6W Mw=5.5  EMSC   CHIAPAS, MEXICO              

P:  8AUG2019 117740    14.0N   92.0W 3.5-5.1 BBBAA  Guatemala                  

 

Another area with continuing seismicity at 103 degrees from California was Crete, Greece where an M 4.5 was felt with intensity IV in Dafnes, Iraklion, Greece today.

 

O: 12AUG2019 23:38:56  35.2N   28.0E mb=4.0  EMSC   DODECANESE ISLANDS, GREECE   

P:  9AUG2019 117817    36.0N   28.0E 3.5-4.9 BAAAA  Turkey                     

 

O: 12AUG2019 07:57:08  35.8N   25.7E ML=4.7  EMSC   CRETE, GREECE                

P:  9AUG2019 117769    36.0N   24.0E 3.0-4.3 BABAA  Aegean Sea                 

 

The strongest earthquake in the U.S. or Alaska today was an M 4.5 in Hawaii. NEIC reported it was felt with intensity IV in Hawaii at Pepeekeo, Papaikou, Hakalau, Papaaloa and II-III in Honomu, Keaau, Ninole, Kurtistown, Mountain View and Laupahoehoe, Hawaii. This continues strong regional activation following the M 6.8 in Sumatra of August 2 which is at 103 degrees from today's epicenter as noted when a smaller event hit the area yesterday:

 

 

"Another earthquake of M>=3 occurred in Hawaii today and was widely felt. NEIC reported this earthquake of M 3.0 in Hawaii  was felt with intensity II-III in the area(s) of Hawaiiat Laupahoehoe, Papaaloa, Paauilo, Ookala, Papaikou, Hilo, Honomu, Honolaa and Kamuela. Hawaii has become active in early August 2019 with earthquakes up to M 3.5. It is located at 103 degrees from Sumatra where an M 6.8 hit on August 2 and may be promoted by surface energy from that epicenter. Forecast 117741 had expected today's activity within about 50 km around August 11. Regional seismicity in Hawaii is likely to remain high for the next week with the possibility of a moderate quake in that time." (August 11-12, 2019)

 

This active period in Hawaii was also probably brought about by several Hurricanes which passed through the islands last week as noted in previous summaries:

 

"Hurricane Flossie continued northeast of Hawaii today with winds up to 40 kts. This system is currently showing no signs of  seismic impact in this region as it is expected  to move to the west over the next several days." (August 7-9, 2019)

 

The last activity in Hawaii with M>=4.5 occurred April 14, 2019 with M 5.3. The only comparable activity in the area since the end of the 2018 eruption in August, 2018 was an M 5.5 on March 13, 2019. Forecast 117741 had expected a moderate earthquake in Hawaii was likely around August 11.

 

O: 12AUG2019 14:41:56  19.8N  155.0W ML=4.5  EMSC   ISLAND OF HAWAII, HAWAII     

P: 11AUG2019 117741    19.4N  155.3W 3.0-4.3 AAAAA  Hawaii                     

 

The M 4.5 in Hawaii was preceded by an earthquake of M 2.6 in the Oahu, Hawaii region. It occurred near local solar midnight and may have been promoted by tidal stresses which maximize at this hour. This is the strongest event within about 100 km of this epicenter since an M 3.3 on February 3, 2019. Forecast 117758 had expected regional activity in early August.

 

O: 12AUG2019 11:05:21  21.4N  157.3W Ml=2.6  EMSC   OAHU REGION, HAWAII          

P:  7AUG2019 117758    20.4N  155.1W 4.0-5.4 AAAAA  Hawaii area                

P: 11AUG2019 117741    19.4N  155.3W 3.0-4.3 AAAAA  Hawaii                     

 

MODERATE QUAKE IN SOUTH ISLAND, NEW ZEALAND; PROBABLY PROMOTED FROM CALIFORNIA

 

EARTHQUAKE SUMMARY FOR AUGUST 11, 2019

 

The strongest earthquake of the day occurred in South Island, New Zealand wher an M 4.7-5.2 in South Island, New Zealand was widely felt today. GEONET reported this earthquake was felt with moderate intensity in northern South Island. 2100 people reported feeling this event;  1135 with weak intensity; 884 with light shaking; 76 moderate; 4 strong; 1 with severe and 0 with extreme shaking. NEIC reported this earthquake at M 4.7 in South Island, New Zealand was felt with intensity II-III in the area(s) of Mapua, Tapawera, Tasman and Nelson, South Island, New Zealand and in Wellington, North Island.

The last earthquake of M>=5.2 within about 150 km of today's epicenter occurred January 5, 2017 with M 5.4. It was probably a regional aftershock of the M 7.8 which hit the region on November 13, 2016. Forecast 117927 had expected today's event was likely around August 6-11. Southern New Zealand from Snares Island north became very active following the M 7.1 earthquake in Central California of July 6. This activation has included events up to M 6.7 and a number of moderate to moderately large quakes in the past month. The area lies near 103 degrees from the California epicenters and from the M 8.0 in Peru of May, 2019  and was probably promoted from those sources as previously proposed in this summary:

 

 

"California seismicity, especially around Southern California was enhanced today. Eight earthquakes outside the immediate Ridgecrest aftershock zone reach M>-3 magnitudes today  in this area. One of the specialties of this summary, not generally available elsewhere is enhancement of seismicity at far-field distances. These generally include enhanced seismicity at nodal distances (51, 60, 72. 90, 103, 120, 144 and 180 degrees) from the epicenter of the major earthquake. ...  Those at or near 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying map by stippled white lines." (July 6, 2019)

 

O: 11AUG2019 20:44:34  41.2S  172.8E mb=4.7  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 11AUG2019 20:44:36  41.2S  172.9E ML=5.2  GEONET Felt with moderate intensity

P:  6AUG2019 117927    42.0S  172.0E 3.0-4.8 BAAAA  So. Island, N.Z.           

P: 11AUG2019 117927    43.0S  171.0E 3.0-4.8 ABBAA  So. Island, N.Z.           

 

An unusual earthquake of M 4.1 occurred today in  Hungary.  Only four earthquakes of M>=4.1 have occurred in Hungary within about 150 km of today's epicenter in  the past 30 years. The last of these was an M 4.1 on Jun 5, 2013; the largest were of M 4.4 and 4.3 on April 22, 2013 and January 29, 2011. Forecast 117822 had expected today's event was likely in this area around August 11.

 

O: 11AUG2019 23:29:46  47.6N   20.3E ML=4.1  EMSC   HUNGARY                      

P: 11AUG2019 117822    48.0N   18.0E 3.0-4.9 AABAA  Adriatic Sea               

 

The strongest seismicity in the U.S. or Canada today occurred in the Fox and the Andreanof Islands with two events of M 3.6. Earthquakes at the magnitude level are common in this region and in the past month include and M 3.8 and 4.0 on August 5 and an M 3.7 on July 31, 2019. Forecast 117859 had expected today's activity within about 100 km was likely in early August.

 

O: 11AUG2019 10:29:06  51.9N  173.1W mb=3.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  4AUG2019 117859    52.3N  174.6W 3.5-4.8 CAAAA  Andreanoff Isls, Aleutians 

 

O: 11AUG2019 08:19:59  52.0N  170.9W mb=3.6  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  6AUG2019 117859    52.4N  170.7W 3.5-4.9 BAAAA  Andreanoff Isls, Aleutians 

 

Another earthquake of M>=3 occurred in Hawaii today and was widely felt. NEIC reported this earthquake of M 3.0 in Hawaii  was felt with intensity II-III in the area(s) of Hawaiiat Laupahoehoe, Papaaloa, Paauilo, Ookala, Papaikou, Hilo, Honomu, Honolaa and Kamuela. Hawaii has become active in early August 2019 with earthquakes up to M 3.5. It is located at 103 degrees from Sumatra where an M 6.8 hit on August 2 and may be promoted by surface energy from that epicenter. Forecast 117741 had expected today's activity within about 50 km around August 11. Regional seismicity in Hawaii is likely to remain high for the next week with the possibility of a moderate quake in that time.

 

O: 11AUG2019 20:02:58  19.9N  155.4W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

P: 11AUG2019 117741    19.4N  155.3W 3.0-4.3 AAAAA  Hawaii                     

 

ANATOLIAN ZONE CONTINUES ACTIVE

 

EARTHQUAKE SUMMARY FOR AUGUST 10, 2019

 

Seismic activation of the Anatolian Fault Zone in Greece, Turkey and Azerbaijan continued today with an M 5.0 in Crete, Greece and a series in Azerbaijan of M 4.9, 4.4 and 4.1 among others of lesser magnitude. An M 5.0 hit within about 150 km of the event in Crete on July 31, 2019 but the last in this area of greater magnitude was an M 5.3 on July 31, 2017. Forecast 117784 had expected today's area would be active around August 6. This epicenter in Crete and that in Azerbaijan is at 102 degrees from the M 7.1 in Southern California of July 6 and was probably promoted by energy from that source.

 

O: 11AUG2019 07:02:50  34.3N   25.0E mb=5.0  EMSC   CRETE, GREECE                

P:  6AUG2019 117784    34.0N   27.0E 3.0-4.3 BABAA  Crete                      

 

The activity in Azerbaijan included events of M 4.9, 4.4 and 4.1 and was the strongest within about 150 km of those epicenters since an M 5.1 on February 5, 2019 and prior to that an M 5.3 on June 5, 2018.  Forecast 117830 had expected activity southeast of this around August 11.

 

NEIC reported this earthquake of M 4.9 in Azerbaijan  was felt with intensity II-III in the area(s) of Azerbaijan at Zaqatala and in Georgia at Tblisi and Zahesi Mtskheta-Mtianeti. This epicenter in Azebaijan is at 101-102 degrees from the M 7.1 in Southern California of July 6 and was probably promoted by energy from that source.

 

O: 10AUG2019 11:22:48  41.6N   46.6E mb=4.1  EMSC   AZERBAIJAN                    

O: 11AUG2019 03:29:20  41.6N   46.6E mb=4.4  EMSC   AZERBAIJAN                   

O: 10AUG2019 07:35:10  41.8N   46.8E mb=4.9  EMSC   AZERBAIJAN                   

P: 11AUG2019 117830    40.0N   50.0E 4.0-5.4 ABCAA  Kazakhstan                 

 

The strongest activity of the day occurred in the region of Indonesia and Sumatra. The largest of these was an M 5.4 in the Banda Sea; but earthquakes of M 5.3 and 5.3 also hit southwest of Sumatra, Indonesia and with M 5.2 in Southern Sumatra, Indonesia. Enhanced seismicity in this region had been expected at this time in this summary as:

 

"The geomagnetic field saw minor to major storm conditions today. The AP level was 24.  High latitude geomagnetic field saw active conditions  with AP at 12.  This is the greatest disturbance in the geomagnetic field since AP reached 36 on May 14, 2019.  The last storm of significantly larger AP occurred nearly a year ago on August 26, 2008 when AP reached 76 and high latitude AP was 90. Seismic increases are likely at high latitudes and within about 15 degrees of the geomagnetic equator beginning August 6 through August 11 due to triggering effects from this storm. The most likely timing of a strong to major event is August 10-12, the most likely regions - Indonesia, the Philippines the Southwest Pacific and Alaska." (August 6-7, 2019)

 

NEIC reported this earthquake of M 5.2 in Southern Sumatra  was felt with intensity II-III in the area(s) of Southern Sumatra at Padang Pariaman and Padang, Sumatra, Indonesia.

 

O: 10AUG2019 21:11:09   0.8S   99.4E Mw=5.2  EMSC   SOUTHERN SUMATRA, INDONESIA  

P: 10AUG2019 117717     0.0N   99.0E 4.0-5.3 AAAAA  So. Sumatera               

 

O: 11AUG2019 02:11:08   7.2S  102.9E mb=5.3  EMSC   SOUTHWEST OF SUMATRA, INDONESI

O: 11AUG2019 04:39:02   7.2S  103.0E mb=5.3  EMSC   SOUTHWEST OF SUMATRA, INDONESI

P:  8AUG2019 117731     6.0S  102.0E 4.0-5.5 BBAAA  So. of Sumatera            

 

O: 10AUG2019 12:01:34   5.6S  129.7E Mw=5.4  EMSC   BANDA SEA                    

P: 11AUG2019 117718     6.0S  129.0E 4.0-5.3 AAAAA  Banda Sea                  

 

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the Fox Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last earthquake within about  150 km of this epicenter with M>=4.9 occurred as an < 5.4 on July 9, 2019 and prior to that an M 4.9 on March 4, 2018. Forecast 117863 had expected activity in this area was likely around August 9.

 

 

O: 10AUG2019 21:38:54  52.3N  168.3W mb=4.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  9AUG2019 117863    51.7N  166.4W 3.5-4.8 AAAAA  Fox Islands, Aleutians     

 

Earthquakes of M 4.5 and 3.7 occurred in the northern Gulf of California and Baja California today. This is an area which is often associated with strong geomagnetic storms and the storm of August 5 may have helped bring these events up to date. The M 4.5 is the strongest within about 100 km of this epicenter since an M 5.2 on April 6, 2019 and prior to that an M 4.5 on July 28, 2018. A swarm including an M 5.5 hit the region in March 28, 2016.  Forecast 117801 had expected today's activity in this region was likely around August 11.

 

O: 10AUG2019 18:53:06  30.8N  115.3W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO      

O: 10AUG2019 08:28:46  31.2N  114.2W ML=4.5  EMSC   GULF OF CALIFORNIA           

P: 11AUG2019 117801    30.2N  114.1W 2.0-3.8 AAAAA  SW U.S.A                   

 

MODERATE QUAKES IN KAMCHATKA, RUSSIA

 

EARTHQUAKE SUMMARY FOR AUGUST 9, 2019

 

The strongest earthquake in the world today was an M 5.5 in the region of Kamchatka, Russia. It was not reported felt in this remote area. It joined three other moderate sized regional events in the Kamchatka area including an M 5.0. This is unusual for the region, but not uncommon. The last earthquake within about 200 of this epicenter in Kamchatka with M>=5.5 occurred November 14, 2018 with M 6.1 and before that on March 29, 2017 with M 6.6. Forecast 117862 had expected today's M 5.5 was likely in Kamchatka in early August.

 

O:  9AUG2019 21:26:58  55.9N  161.8E Mw=5.5  EMSC   NEAR EAST COAST OF KAMCHATKA 

P:  3AUG2019 117862    52.0N  161.0E 4.0-5.3 CCAAA  E. of Kamchatka             

 

O: 10AUG2019 05:12:30  53.6N  162.2E mb=4.1  EMSC   OFF EAST COAST OF KAMCHATKA  

P:  3AUG2019 117862    52.0N  161.0E 4.0-5.3 CBAAA  E. of Kamchatka            

 

O:  9AUG2019 22:35:50  54.9N  160.7E mb=5.0  EMSC   NEAR EAST COAST OF KAMCHATKA 

P:  4AUG2019 117864    52.0N  158.0E 4.0-5.7 BCBAA  Kamchatka                  

 

O: 10AUG2019 00:33:50  55.8N  162.2E mb=4.0  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 31JUL2019 117646    56.0N  166.0E 4.0-5.5 CACAA  Komandorsky Isl            

 

The second strongest felt earthquake in the world today was an M 5.2 in northern Qinghai, China. The last earthquake within about 200 km of this epicenter in China with M>=5.2 was an M 5.2 on August 13, 2016; the last such event of larger magnitude was an M 5.9 within about 25 km of today's epicenter on January 20, 2016. There were no such events in the area between 2004 and 2016.  Forecast 117809 had expected today's event within about 50 km was likely around August 10. This epicenter is in the antipodal area of the M 6.8 in Central Chile of August 1 and may have been promoted by focused energy from that event.

 

O:  9AUG2019 07:23:51  37.8N  101.7E mb=5.2  EMSC   NORTHERN QINGHAI, CHINA      

P: 10AUG2019 117809    38.0N  101.0E 3.5-4.8 AAAAA  So. China                   

 

About a day after the event in China, an M 5.4 occurred in Tajikistan directly east of the Chinese event. This is probably related to the M 5.8 in Afghanistan two days ago of August 8. The last such event other than that with M>=5.4 within about 200 km of today's epicenter was an M 5.6 on February 2, 2019. Forecast 117785 had expected today's event in this area was likely around August 9.

 

NEIC reported this earthquake of M 5.4 in Tajikistan  was felt with intensity V in Mingaora, North-west Pakistan and II-III in the area(s) of Tajikistan at  Dushanbe and in Gujranwala, Punjab, Pakistan.

 

O: 10AUG2019 06:43:11  37.2N   71.6E mb=5.4  EMSC   TAJIKISTAN                   

P:  9AUG2019 117785    38.0N   73.0E 3.8-5.1 AAAAA  Hindu Kush/Pakistan         

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Rat Islands, Aleutians. It was not reported felt in this remote area. The last earthquake of M>=4.2 in the active Rat Islands within about 200 km of this epicenter occurred as an M 4.5 on August 5, 2019.  Forecast 117870 had expected today's event was likely around August 8.

 

Elevated seismicity along the Anatolian Fault Zone in Greece and Turkey also continued today. An M 4.5 occurred in Southern Greece in this current activation. NEIC reported this earthquake of M 4.5 in  Southern Greece was felt with intensity II-III in the area(s) of Southern Greece at Kalamakion, and Katastrion, Zakinthos and Meligalas, Messinia.  This follows an M 5.8 in western Turkey yesterday and may have been promoted from that event. The last earthquake in Greece within about 100 km of this epicenter of larger magnitude was an M 4.7 on May 21, 2019. Forecast 117792 had expected today's event was likely within about 25 km of this epicenter around August 11.

 

O:  9AUG2019 21:39:41  37.2N   21.2E Mw=4.5  EMSC   SOUTHERN GREECE              

P: 11AUG2019 117792    37.0N   21.0E 3.0-4.3 AAAAA  No. Greece                 

 

O:  9AUG2019 19:45:30  51.9N  179.9E mb=4.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  8AUG2019 117870    51.0N  178.0E 4.0-5.5 AABAA  Rat Islands                

 

An M 4.1 also occurred today off the coast of Oregon.  NEIC reported this earthquake of M 4.1 off the Oregon coast may have been felt with intensity II in Newberg, Oregon. The M 3.3 off the coast of Oregon  may have been felt with intensity II-III in the area(s) of on the coast of Oregon at Rockaway Beach and Clackamas. This was the largest event in the U.S. outside Alaska today. The last activity off the Coast of Oregon with M>=4 occurred on July 3, 2019 (M 4.1) in a regional activation which led to the M 7.1 in Central California on July 6. Forecast 117843 had expected today's event was likely around August 6.

 

O:  9AUG2019 16:39:43  43.8N  129.6W mb=4.1  EMSC   OFF COAST OF OREGON          

P:  6AUG2019 117843    44.5N  129.8W 3.0-4.4 BAAAA  Off Coast of Oregon        

 

The most unusual earthquake in the U.S. today was an M 2.8 in Mississippi where it was widely felt. NEIC reported this earthquake of M 2.8 in  Mississippi was felt with intensity II-III in the area(s) of Mississippi Madison, Brandon, Canton, Ridgeland, Flora, Jackson, Vicksburg, Ellisville, and Natchez. The only earthquake in Mississippi of M>=2 in the past year was an M 3.7 on January 8, 2019. Forecast 117812 had expected today's event was possible within about 200 km around August 8.

 

O:  9AUG2019 07:33:05  32.5N   90.0W mb=2.8  EMSC   MISSISSIPPI                  

P:  8AUG2019 117812    34.0N   92.0W 2.0-3.8 ABBAA  Southeast U.S.             

 

STRONG EARTHQUAKE IN WESTERN TURKEY

 

EARTHQUAKE SUMMARY FOR AUGUST 8, 2019

 

Strong seismicity continued today near 103 degrees from the M 7.1 in Southern California of July 6, 2019. Seismic energy is concentrated at this distance from large surface disturbances by reflection and refraction of seismic energy off the core-mantle boundary back to the surface where it arrives in this distance zone. Yesterday moderately strong earthquakes in Taiwan and Hindu Kush, Afghanistan occurred near this distance from Southern California. Today an M 5.8 was widely felt in western Turkey at 101-102 from the California epicenters. Today's event was preceded by a series of light foreshocks and at least one moderate event of M 4.6 to the west of the mainshock epicenter. This appears to be part of the activation of the Anatolian Fault Zone which began shortly after the mainshocks in California as noted in previous issues of this report:

 

"Energy on the surface from California does not have a good angle with the east-west orientation of the North Anatolian Fault though, so a major quake in this  area, while it could happen, is unlikely to have been triggered from California.

Still, the conditions may be ripe for a moderate quake in northern Turkey or Greece at this time. Both areas respond to geomagnetic storms." (July 10, 2019)

 

Note that these areas including Turkey were known to respond to geomagnetic storms. The storm of August 4-6 is now declining and immediate effects on seismicity  may be completed in today's activity in northwestern Turkey. But a strong related earthquake to the geomagnetic storm is still possible around August 10-12 as noted:

 

"The geomagnetic field saw minor to major storm conditions today. The AP level was 6.  High latitude geomagnetic field saw active conditions  with AP at 7.  This concludes the greatest disturbance in the geomagnetic field since AP reached 36 on May 14, 2019.  The last storm of significantly larger AP occurred nearly a year ago on August 26, 2008 when AP reached 76 and high latitude AP was 90. Seismic increases are likely at high latitudes and within about 15 degrees of the geomagnetic equator beginning August 6 through August 11 due to triggering effects from this storm. The most likely timing of a strong to major event is August 10-12, the most likely regions - Indonesia, the Philippines the Southwest Pacific and Alaska." (August 5-7, 2019)

 

NEIC reported the M 5.8 in Turkey was felt with maximum intensity VI in Turkey at Isparta and IV in Denizli and Antalya with lesser II-III shaking reported from Baklan, Yesilova, Akkoy, Karacasu, Ayden, Dalaman and Fethiye Mugla, Turkey.

An M 4.2 minutes before the M 5.8 was felt with intensity III in Isparta and Manavgat, Antalya, Turkey. The M 4.6 near the coast of western Turkey which preceded both was reported by NEIC to have been felt with maximum intensity IV in Sefenhisar and Menderes, Izmit and in Kusadasi, Aydin, Turkey. Lesser shaking of II-III was reported from Urla, Izmit, Soke, Cesme and Goca, Izmit and in Kokkanon Samos, Greece.

 

The M 5.8 was the strongest earthquake within about 200 km of that epicenter since an M 6.0 on February 3, 2002 more than 17 years ago. Forecast 117818 and 117770 had expected today's activity was likely in early August. This epicenter is at 101-104 degrees from the Banda Sea event of June 24, 2019 (M 7.3); the M 8.0 in Peru of May 26, 2019 and the M 7.1 event in Southern California of July 6, 2019. These sources probably helped promote enhanced seismicity in Turkey at this time.

 

O:  8AUG2019 11:19:36  37.9N   29.6E ML=4.2  EMSC   WESTERN TURKEY               

O:  8AUG2019 11:25:31  37.9N   29.6E Mw=5.8  EMSC   WESTERN TURKEY               

P:  4AUG2019 117818    39.0N   31.0E 3.5-4.8 BBAAA  Turkey                     

 

O:  8AUG2019 08:39:08  38.0N   26.9E mb=4.6  EMSC   NEAR THE COAST OF WESTERN TURK

P:  6AUG2019 117770    39.0N   27.0E 3.0-4.3 AAAAA  Aegean Sea                 

 

RONG QUAKES SHAKE TAIWAN AND AFGHANISTAN/PAKISTAN

 

EARTHQUAKE SUMMARY FOR AUGUST 7, 2019

 

Moderately large earthquakes were felt widely today in Taiwan (M 5.9-6.0) and in Afghanistan/Pakistan (M 5.8).

 

The strongest of these was an M 5.9-6.0 off the northern coast of Taiwan. NEIC reported maximum intensity V in Ilan, Taipei, and Keelung, Taiwan and IV in Taipei and Hualien.  CWB reported this earthquake was felt with intensity VI in Yilan; IV in Hualien, Taipei, Hsinchu, Taoyuan, Taichung; III in Nantou, Keelung, Miaoli, Changhua and Yunlin; II in Chiayi, Tainan and I in Taitung, Kaohsiung, Pingtung and Penghu Counties, Taiwan. An aftershock of M 4.6 was reported felt with intensity III in Yilan and Taipei; II in Taoyuan and I in Hualien, Keelung, Hsinchu, Nantou, Miaoli and Taichung Counties, Taiwan.

 

This earthquake in northern Taiwan was probably triggered by stresses from the strong Typhoon Lekima now with winds up to 140 kts, which was situated near the epicenter at the time of the earthquake. This summary in the previous issue had expected this possibility as:

 

"TYPHOON LEKIMA (10W) continued  east of the Northern Philippines  today with winds up to 85 kts. This system is currently moving northeastward. It may strengthen and impact central Philippines and Taiwan early next week. A seismic watch may be called for Taiwan, northern and Central Philippines and the Ryukyu Islands." (August 6-7, 2019)

 

The last earthquake in Taiwan within about 200 km of today's epicenter with M>=6 occurred as an M 6.1 on April 18, 2019 and prior to that an M 6.4 on February 6, 2018.  Forecast 117767 had expected today's event was likely within about 50 km of this epicenter around August 7. This epicenter is near 100 degrees from Southern California where an M 7.1 on July 6, 2019 may have provided energy to promote the Taiwan region.

 

O:  7AUG2019 21:28:05  24.5N  122.0E Mw=5.8  EMSC   TAIWAN                       

O:  7AUG2019 21:28:03  24.4N  121.9E ML=6.0  TAI    Hualien, Taiwan              

O:  7AUG2019 23:02:23  24.6N  121.8E ML=4.6  EMSC   TAIWAN                       

O:  7AUG2019 23:02:23  24.6N  121.8E ML=4.6  TAI    Hualien, Taiwan              

P:  7AUG2019 117767    24.0N  122.0E 4.0-5.3 AAAAA  Taiwan                     

 

The earthquake in Hindu Kush, Afghanistan was reported by NEIC to have been felt with maximum intensity IV in Dirn, North-west Frontier Pakistan and II-III in Afghanistan at Kanabad, Mahmoud Raqui; in Tajikistan at Khorug Gorno-Badakhstan, Bustonkala, Khatlon, Obigarm, and Dushanbe and in North-west Frontier,, Pakistan at Tall, and Mingaora.  

The last earthquake of M>=5.8 in the Hindu Kush region of Afghanistan within about 200 km of this epicenter occurred more than a year ago on May 9, 2018 with M 6.2 and prior to that on January 31, 2018 and April 10, 2016 with M 6.1 and 6.6 respectively.   A major M 7.5 hit the region on October 26, 2015 and today's event may be an aftershock of that. Forecast 117785 had expected this activity in Hindu Kush was likely in early August. This epicenter is located at 107 degrees from the M 7.1 in Central California of July 6, 2019 and may have been promoted by concentrated energy from that source as suggested in previous issues of this report:

 

"Areas at ...  or near 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying map by stippled white lines." (July 6, 2019)

 

 

O:  8AUG2019 06:42:45  36.5N   70.8E mb=4.3  EMSC   HINDU KUSH REGION, AFGHANISTAN

O:  8AUG2019 00:45:26  36.6N   70.2E Mw=5.8  EMSC   HINDU KUSH REGION, AFGHANISTAN

P:  1AUG2019 117785    36.0N   72.0E 3.8-5.2 CABAA  Hindu Kush/Pakistan        

P:  9AUG2019 117785    38.0N   73.0E 3.8-5.1 ABBAA  Hindu Kush/Pakistan        

 

The earthquakes in Afghanistan and Taiwan are situated in locations which the geomagnetic storm of August 5-6 could have activated as both lie within about 15 degrees of the local geomagnetic equator. This summary had noted the likelihood of triggering from this storm in the previous issue as:

 

"The geomagnetic field saw minor to major storm conditions today. The AP level was 24.  High latitude geomagnetic field saw active conditions  with AP at 12.  This is the greatest disturbance in the geomagnetic field since AP reached 36 on May 14, 2019.  The last storm of significantly larger AP occurred nearly a year ago on August 26, 2008 when AP reached 76 and high latitude AP was 90. Seismic increases are likely at high latitudes and within about 15 degrees of the geomagnetic equator beginning August 6 through August 11 due to triggering effects from this storm. The most likely timing of a strong to major event is August 10-12, the most likely regions - Indonesia, the Philippines the Southwest Pacific and Alaska." (August 6-7, 2019)

 

MODERATELY STRONG QUAKES SHAKE VANUATU

 

EARTHQUAKE SUMMARY FOR AUGUST 6, 2019

 

The strongest earthquakes of the day occurred in Vanuatu with M 5.8 and 5.9. The M 5.9 was reported by NEIC to have been felt with intensity III in Vila Shefa, Vanuatu. The stronger of these occurred near local solar noon, a time when geomagnetic effects can be strong. The last earthquakes of M>=5.8 in central Vanuatu occurred with M 6.6 on July 31, 2019; an M 6.0 on July 1, 2019 and an M 6.3 on March 20, 2019 all near the northerly of today's events. The last such quake of M>=5.9 within about  100 km of the southern event today was an M 6.0 on January 18,, 2019 and an M 6.1 on June 21, 2018.

Forecasts 117903 and 117904 had expected today's activity within about 150 km of these epicenter was likely around August 5-10. These events are at 102-104 degrees from the M 6.8 in Central Chile of August 1 and were probably promoted by concentrated surface energy from that event.

 

O:  7AUG2019 05:32:41  15.5S  167.7E Mw=5.8  EMSC   VANUATU                      

P: 10AUG2019 117903    14.0S  167.0E 4.0-5.3 BBAAA  Vanuatu Islands            

 

O:  6AUG2019 22:14:14  17.9S  168.6E Mw=5.9  EMSC   VANUATU                      

P:  5AUG2019 117904    19.0S  170.0E 4.0-5.4 ABAAA  Vanuatu Islands            

 

The activity in Vanuatu is typical of geomagnetic-promoted seismicity.  The current geomagnetic storm continued today. This summary had expected seismic activity related to this storm in previous issues as:

 

"The geomagnetic field saw minor to major storm conditions today. The AP level was 24.  High latitude geomagnetic field saw active conditions  with AP at 12.  This is the greatest disturbance in the geomagnetic field since AP reached 36 on May 14, 2019.  The last storm of significantly larger AP occurred nearly a year ago on August 26, 2008 when AP reached 76 and high latitude AP was 90. Seismic increases are likely at high latitudes and within about 15 degrees of the geomagnetic equator beginning August 6 through August 11 due to triggering effects from this storm. The most likely timing of a strong to major event is August 10-12, the most likely regions - Indonesia, the Philippines the Southwest Pacific and Alaska." (August 6-7, 2019)

 

Seismicity also continued today in the area of Lake Edward, Uganda. This region has been active with moderate quakes over the past two days and may be related to the geomagnetic storm which often activates the area of the East Africa Rift. Forecast 117508 had expected today's event in late July or early August.

 

NEIC reported this earthquake of M 4.6 in  Uganda was felt with intensity IV in the area(s) of Uganda at Katwe, Mbarara, Kigorobya and II-III in Kasese, Fort Portal, Kajansi, Kampala, Kireka and Jinja, Uganda. 

 

O:  6AUG2019 16:58:29   0.0S   30.1E mb=4.6  EMSC   LAKE EDWARD REGION, UGANDA   

P: 31JUL2019 117508     2.0S   29.0E 3.0-4.3 CBAAA  Lake Victoria area         

 

STRONGEST GEOMAGNETIC STORM IN MONTHS MAY REFRESH SEISMICITY

 

EARTHQUAKE SUMMARY FOR AUGUST 5, 2019

 

The geomagnetic field saw minor to major storm conditions today. The AP level was 35.  High latitude geomagnetic field saw major storm conditions  with AP at 61. This is the greatest disturbance in the geomagnetic field since AP reached 36 on May 14, 2019. The last storm of significantly larger AP occurred nearly a year ago on August 26, 2008 when AP reached 76 and high latitude AP was 90. Seismic increases are likely at high latitudes and within about 15 degrees of the geomagnetic equator beginning August 6 through August 11 due to triggering effects from this storm. The most likely timing of a strong to major event is August 10-12, the most likely regions - Indonesia, the southwest Pacific or Alaska.

 

The strongest earthquake in the world today was an M 5.7 in Tonga. It was not reported felt in the epicentral area. This is the strongest earthquake in Tonga within about 200 km of this epicenter since December 23, 2018 when an M 6.4 occurred about 150 km southwest of this epicenter. Forecast 117692 had expected today's event was likely within about 100 km at the end of July or in early August, 2019.

 

O:  5AUG2019 09:01:07  19.2S  174.8W Mw=5.7  EMSC   TONGA                         

P: 29JUL2019 117692    20.0S  175.0W 4.0-5.3 CAAAA  Tonga Islands              

 

An earthquake of M 4.1 in Western Montana today continued elevated seismicity in that region which has been ongoing for several days. NEIC reported today's event was felt with maximum intensity IV in Manhattan, Radersburg and  Belgrade, Montana and II-III in Three Forks, Bozeman, Toston, Harrison, and Townsend, Montana. This is the strongest earthquake within about 100 km of this epicenter since an M 4.1 on June 18, 2006. Two similar quakes in April and May, 2000 round out the list of such events of M>=4.1 in the area in the past 30 years. Forecast 117855  had expected today's event was likely around August 4.

 

O:  6AUG2019 04:27:04  45.9N  111.4W Mw=4.1  EMSC   WESTERN MONTANA              

P:  4AUG2019 117855    45.6N  111.9W 2.0-3.9 AAAAA  Yellowstone/Wyoming        

 

The activity off the coast of southeastern Alaska also continued today. This may have been promoted by the geomagnetic storm and included the largest event in the current swarm - an M 4.0. The last earthquake within about 200 km of today's epicenter with M>=4 occurred on September 21, 2017 (M 4.0) and before that on August 18, 2017 also with M 4.0. Forecast 117872 had expected today's activity was likely around August 5.

 

O:  5AUG2019 11:46:07  58.0N  137.7W ML=4.0  EMSC   OFF COAST OF SOUTHEASTERN ALAS

O:  5AUG2019 11:46:10  58.2N  136.9W MB=4.0  ECAN   JUNEAU, AK                  

O:  5AUG2019 22:25:20  59.0N  135.9W ML=2.4  EMSC   SOUTHEASTERN ALASKA          

P:  5AUG2019 117872    58.0N  136.0W 3.0-4.4 AAAAA  Southeast Alaska           

 

An aftershock of M 4.1-4.3 also occurred today in the Anchorage, Alaska aftershock zone. NEIC reported it was felt with intensity III in Alaska at Wasilla, Willow, Elmendorf AFB, Fort Richardson, Chugiak and Anchorage. This is the strongest aftershock near Anchorage, Alaska mainshock of M 7.0 of November 30, 2018 since an M 4.4 on February 18 2019, nearly half a year ago.  Forecast 117876 had expected moderate seismicity in the area in early August.

 

 

O:  5AUG2019 17:59:58  61.5N  149.9W mb=4.3  EMSC   SOUTHERN ALASKA              

P:  7AUG2019 117876    60.1N  148.4W 3.2-5.1 ABAAA  Central Alaska             

 

The most unusual earthquake of the day was an M 4.4 in the region of East Africa near Lake Edward, Congo. The last event of M 4.4-4.5 within about 200 km of this epicenter was an M 4.5 on April 18, 2019. The last of significantly larger  magnitude occurred July 30, 2017 with M 5.3.  Forecast 117508 had expected today's event about 100 km to the south around July 31.

 

NEIC reported this earthquake of M 4.4 in  D.R. Congo was felt with intensity II-III in the area(s) of Kigali Ville de Kigali, Rwanda.

 

O:  5AUG2019 09:37:13   0.9S   29.5E mb=4.4  EMSC   LAKE EDWARD REGION, CONGO    

P: 31JUL2019 117508     2.0S   29.0E 3.0-4.3 BBAAA  Lake Victoria area         

 

A moderate M 4.1-4.4 also shook areas of Romania today. This, like the event in the Congo, is located at a longitude which was near local solar midnight, at the time of occurrence. Geomagnetic effects are most prominent during geomagnetic storms at local solar midnight and noon. The last earthquakes of M>=4.4 in Romania occurred on October 28, 2018 (M 5.5) and April 25, 2018 (M 4.6). Forecast 117849 had expected today's earthquake was likely within about 25 km  of the epicenter around August 5.

 

NEIC reported this earthquake of M 4.4 in Romania was felt with intensity II-III in the area(s) of Onesti Bacau and Cornu Prahova, Romania.

   

O:  5AUG2019 21:05:08  45.8N   26.7E ML=4.4  ANSS   ROMANIA                      

O:  5AUG2019 21:05:08  45.8N   26.7E ML=4.1  EMSC   ROMANIA                      

P:  5AUG2019 117849    46.0N   26.0E 3.0-4.8 AAAAA  Romania/NW Turkey          

 

STRONGEST QUAKE OFF NORTH-EASTERN HONSHU IN NEARLY THREE YEARS

 

EARTHQUAKE SUMMARY FOR AUGUST 4, 2019

 

The strongest earthquake in the world today occurred as an M 6.4 off the east coast of Honshu, Japan. NEIC reported maximum intensity VII in Japan at Miyagi; IV in Fukushima, and lesser shaking within about 150 km of the epicenter in Honshu.

This may related to the series of events of this size which have occurred as strong tropical storms have hit Honshu over the past week. This was noted in the previous issue as:

 

 

"A moderate earthquake of M 4.6 also occurred today off the east coast of Honshu, Japan. NEIC reported this earthquake of M 4.6 off eastern Honshu, Japan  was felt with intensity II-III in the area(s) of Miyagi and Tokyo, Japan. This event may be part of the triggered activity along the eastern and southern coast of Honshu associated with recent strong oceanic storms. A new storm will arrive today and could help trigger another strong earthquake along eastern Honshu, Japan. This summary noted this as:

 

"TS Francisco continued  southeast of Japan and the Bonin Islands today with winds up to 55 kts. This system is currently moving eastward. It may strengthen and impact southwestern Japan early next week. A seismic watch is being called for southern and eastern Honshu, Japan for the next four days." (August 2-4, 2019)

 

Today's event of M 6.3 is the strongest within about 150 km of this epicenter since an M 6.9 on November 21, 2016 and prior to that an M 6.8 on May 12, 2105. This is within the rupture zone of the March 11, 2011 quake and tsunami off eastern Honshu which killed tens of thousands and did massive damage to the area. Forecasts 117827 and 117798 had expected today's event was likely in this area around August 4-7.

 

O:  4AUG2019 10:23:03  37.8N  141.5E Mw=6.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  4AUG2019 117827    40.0N  142.0E 3.5-5.3 ACAAA  Hokkaido, Japan            

P:  7AUG2019 117798    36.0N  142.0E 4.0-5.3 BBAAA  Off East Coast Honshu      

 

The swarm of earthquakes south of South Island, New Zealand in the Auckland Islands continued today. This event was given magnitude up to M 6.7 by GEONET and 4.9 by EMSC but appears to be closer to the GEONET value.  GEONET reported this earthquake at M 6.7 was felt with weak intensity by 64 persons; light intensity by 31 and Moderate intensity by 3. The area had been discussed in the previous issue of this summary as:

 

 

"The strongest reported earthquake in the world today was an M 5.0-5.8 in the area south of South Island, New Zealand near Snares Island. GEONET reported this earthquake at M 5.8 was felt in the area south of South Island, New Zealand with weak intensity by 19 persons; light intensity by 6 and Moderate intensity by 0. NEIC reported this earthquake of M 5.0 in Snares Island, New Zealand was felt with intensity II-III in the area(s) of Invercargill, Southland, New Zealand. This summary has followed the foreshocks in this area over the past week. For example in the summary of July 18, 2019 it had been noted:

 

"A series of moderate earthquake with maximum M 5.3, 4.9 and 4.7 was felt with weak intensity in the Snares Island region of Southern South Island, New Zealand today. GEONET reported these events were felt with weak intensity by one person.

This activity is at 106-107 degrees from the M 7.1 in Central California of July 6 and may have been promoted from this source as noted in previous summaries:

 

"(earthquakes at or near) 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying map by stippled white lines." (July 6-15, 2019)

 

The last earthquake recorded by GEONET in the Snares Island region with M>=5.3 was an M 5.8 on November 24, 2018 and prior to that an M 5.7 on October 13, 2014." (July 18, 2019)

 

Forecast 117930 had expected today's event within about 100 km was likely around August 4." (August 3-4, 2019)

 

 

O:  4AUG2019 11:44:18  49.2S  164.1E mb=4.9  EMSC   AUCKLAND ISLANDS, N.Z. REGION

O: 04AUG2019 11:44:20  49.3S  164.2E ML=6.7  GEONET Felt with weak intensity

P:  4AUG2019 117930    47.0S  165.0E 3.0-4.8 ACAAA  Southern S. Isl. N.Z.      

 

A moderately strong M 5.8 also hit the Central Mid-Atlantic Ridge today. It was not felt in this remote oceanic region. This is the strongest earthquake within about 150 km of this epicenter in nearly 11 years - since an M 5.8 on September 16, 2008. The largest events in the region in the past 30 years were M 5.9-6.0 on March 9 and June 5, 2006. This epicenter is in the antipodal area of the M 7.5 in New Britain of May 14, 2019 and may have been promoted by energy from that source. Forecast 117709 had expected today's event was likely in early August.

 

O:  5AUG2019 00:40:45   1.0N   27.8W Mw=5.8  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 10AUG2019 117709     1.0N   29.0W 4.0-5.3 BAAAA  Central Mid-Atlantic Ridg  

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the Rat Islands, Aleutians. The Rat Islands are a seismic active area. The last event in the area within about 150 km of today's event with M>=4.5 was an M 4.6 on July 30, 2019. This and today's event are probably aftershocks of an M 6.4 which hit the area to the north on April 2, 2019. Forecast 117870 expected today's event was likely within about 50 km of this epicenter around August 8.

 

O:  5AUG2019 00:08:39  50.6N  178.2E mb=4.5  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  8AUG2019 117870    51.0N  178.0E 4.0-5.5 BAAAA  Rat Islands                

 

Another M 4.5 occurred in Northern Colombia today. Similar events of about M 4.5 have most recently occurred in association with new moons on July3 and June 9, 2019. These may be aftershocks of an M 5.4 which hit the area January 24, 2019. This epicenter is at the antipode of the M 6.8 in Sumatra of August 2. This possibility of antipodal activity in Northern Colombia had been discussed in the previous summary as:

 

"An earthquake of M 4.1 also occurred today in northern Colombia. This is at the antipode of the M 6.8 event in southern Sumatra two days ago. It had been expected in this summary at the time as:

 

 

"The antipode of this earthquake in Sumatra is located in the Bucaramanga area of northern Colombia. This is an active seismic zone at intermediate focal depths and a moderate to large quake could be triggered at or near the antipode near 7N 73-75W." (August 2-3, 2019)

 

Forecast 117712 had expected this event in Colombia within about 25 km of this epicenter was likely around August 4. More such activity is likely in the  next several days." (August 3-4, 2019)

 

O:  4AUG2019 16:46:49   6.8N   72.9W mb=4.5  EMSC   NORTHERN COLOMBIA            

P:  4AUG2019 117712     7.0N   73.0W 4.0-5.3 AAAAA  Colombia                   

 

MODERATE EARTHQUAKES CONTINUE SOUTH OF SOUTH ISLAND, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR AUGUST 3, 2019

 

The strongest reported earthquake in the world today was an M 5.0-5.8 in the area south of South Island, New Zealand near Snares Island. GEONET reported this earthquake at M 5.8 was felt in the area south of South Island, New Zealand with weak intensity by 19 persons; light intensity by 6 and Moderate intensity by 0. NEIC reported this earthquake of M 5.0 in Snares Island, New Zealand was felt with intensity II-III in the area(s) of Invercargill, Southland, New Zealand.

This summary has followed the foreshocks in this area over the past week. For example in the summary of July 18, 2019 it had been noted:

 

"A series of moderate earthquake with maximum M 5.3, 4.9 and 4.7 was felt with weak intensity in the Snares Island region of Southern South Island, New Zealand today. GEONET reported these events were felt with weak intensity by one person.

This activity is at 106-107 degrees from the M 7.1 in Central California of July 6 and may have been promoted from this source as noted in previous summaries:

 

"(earthquakes at or near) 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying ma by stippled white lines." (July 6-15, 2019)

 

The last earthquake recorded by GEONET in the Snares Island region with M>=5.3 was an M 5.8 on November 24, 2018 and prior to that an M 5.7 on October 13, 2014." (July 18, 2019)

 

Forecast 117930 had expected today's event within about 100 km was likely around August 4.

 

O:  4AUG2019 00:11:05  47.9S  165.7E Mw=5.0  EMSC   OFF W. COAST OF S. ISLAND, N.Z

O: 04AUG2019 00:11:09  47.9S  165.7E ML=5.8  GEONET Felt with weak intensity

P:  4AUG2019 117930    47.0S  165.0E 3.0-4.8 AAAAA  Southern S. Isl. N.Z.      

 

A moderate earthquake of M 4.6 also occurred today off the east coast of Honshu, Japan. NEIC reported this earthquake of M 4.6 off eastern Honshu, Japan  was felt with intensity II-III in the area(s) of Miyagi and Tokyo, Japan. This event may be part of the triggered activity along the eastern and southern coast of Honshu associated with recent strong oceanic storms. A new storm will arrive today and could help trigger another strong earthquake along eastern Honshu, Japan. This summary noted this as:

 

"TS Francisco continued  southeast of Japan and the Bonin Islands today with winds up to 55 kts. This system is currently moving eastward. It may strengthen and impact southwestern Japan early next week. A seismic watch is being called for southern and eastern Honshu, Japan for the next four days." (August 2-3, 2019)

 

Forecast 117827 had expected today's event within about 50 km of the epicenter was likely around August 4.

 

O:  3AUG2019 18:04:18  39.7N  141.5E mb=4.6  EMSC   EASTERN HONSHU, JAPAN        

P:  4AUG2019 117827    40.0N  142.0E 3.5-5.3 AAAAA  Hokkaido, Japan            

 

The strongest earthquake in the U.S. or Canada today was an M 5.2 in the region south of the Fox Islands, Aleutians. NEIC reported it was felt with intensity II in Unalaska, Alaska. This is the largest earthquake within about 200 km of this epicenter south of the Aleutian Islands since an M 5.9 on May 24,, 2017. An M 5.4 occurred about 250 km to the northwest of this on July 9, 2019. Forecast 117873 had expected today's event was likely around August 2.

 

O:  3AUG2019 18:11:25  52.2N  165.7W Mw=5.2  EMSC   SOUTH OF ALEUTIAN ISLANDS    

P:  2AUG2019 117873    54.2N  165.0W 3.5-4.8 ABAAA  Unimak Islands, Aleutians  

 

An earthquake of M 4.1 also occurred today in northern Colombia. This is at the antipode of the M 6.8 event in southern Sumatra two days ago. It had been expected in this summary at the time as:

 

 

"The antipode of this earthquake in Sumatra is located in the Bucaramanga area of northern Colombia. This is an active seismic zone at intermediate focal depths and a moderate to large quake could be triggered at or near the antipode near 7N 73-75W." (August 2-3, 2019)

 

Forecast 117712 had expected this event in Colombia within about 25 km of this epicenter was likely around August 4. More such activity is likely in the  next several days.

 

O:  3AUG2019 11:06:16   6.8N   72.9W mb=4.1  EMSC   NORTHERN COLOMBIA            

P:  4AUG2019 117712     7.0N   73.0W 4.0-5.3 AAAAA  Colombia                   

 

STRONG QUAKE RATTLES SUMATRA, JAVA, BANTEN, INDONESIA

 

EARTHQUAKE SUMMARY FOR AUGUST 2, 2019

 

The strongest earthquake in the world today was an M 6.8-6.9 southwest of Sumatra, Indonesia. It was widely felt with moderae intensity in Sumatra and Java. NEIC reported intensity IV in Indonesia at Labuhan, Serang, Cilegon, Serpong and Curug, Banten and III in Clomas, Pasarkemis, Ciampea, Bandar Lampungt and Palabuhanratu, Java, Indonesia. A minor tsunami may have occurred but was not reported. BMG issued a tsunami warning for waves possibly as high as 3 feet for this earthquake of M 7.0. The warning was later cancelled when no waves were observed. No major damage accompanied the earthquake. The last earthquake of M>=6.8 within about 200 km of today's epicenter was an M 7.4 more than 18 years ago on February 13, 2001. Forecasts 117730 and 117516 had expected activity within about 100 km of today's epicenter was likely in late July or early August.

 

The antipode of this earthquake in Sumatra is located in the Bucaramanga area of northern Colombia. This is an active seismic zone at intermediate focal depths and a moderate to large quake could be triggered at or near the antipode near 7N 73-75W.

 

O:  2AUG2019 12:03:26   7.3S  104.8E Mw=6.8  EMSC   SOUTHWEST OF SUMATRA, INDONESI

O:  2AUG2019 12:03:27   7.3S  104.8E Mw=6.9  ANSS   SOUTHWEST OF SUMATRA, INDONESI

P:  5AUG2019 117730     6.0S  105.0E 4.0-5.3 BBAAA  So. of Java                

P: 23JUL2019 117516     7.0S  104.0E 4.0-5.3 CAAAA  So. of Sumatera            

 

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 off Vancouver Island, Canada. NEIC reported it was felt with intensity II in Gold River, British Columbia, Canada. The last earthquake with M>=4.3 within about 100 km of this epicenter according to NEIC occurred with the last new moon as an M 6.2 on July 4, 2019 with aftershocks of 4.7, 4.6 and 5.6. Forecast 117642 had expected activity in this area at the end of July or in early August.

 

O:  3AUG2019 04:11:46  50.5N  129.8W mb=4.3  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 26JUL2019 117642    50.2N  129.8W 3.0-4.9 BAAAA  British Colombia           

 

Aftershocks continued in the Ridgecrest, California zone today. The strongest of these was an M 3.6 and M 3.3.  NEIC reported this earthquake of M 3.6 in the California Ridgecrest aftershock zone was felt with intensity IV in Trona, California and II-III in the area(s) of the California Ridgecrest aftershock zone at Ridgecrest and Inyokern, California.

The mainshocks occurred July 5 and 6 with M 6.4 and  7.1. Forecast 11772 had expected activity within about 10 km of the M 3.6 was likely around August 4.

 

O: 02AUG2019 15:06:51  35.8N  117.6W Ml=2.5  EMSC   SOUTHERN CALIFORNIA

O: 02AUG2019 14:45:56  35.9N  117.7W Ml=2.6  EMSC   CENTRAL CALIFORNIA

O: 02AUG2019 13:20:26  35.7N  117.5W Ml=2.8  EMSC   SOUTHERN CALIFORNIA

O: 02AUG2019 12:18:42  35.8N  117.6W Ml=3.6  EMSC   SOUTHERN CALIFORNIA

O: 03AUG2019 01:01:23  35.6N  117.4W ML=2.7  EMSC   SOUTHERN CALIFORNIA

O: 03AUG2019 00:34:48  35.8N  117.6W Ml=2.5  EMSC   SOUTHERN CALIFORNIA

O:  2AUG2019 15:19:16  35.6N  117.5W ML=3.3  EMSC   SOUTHERN CALIFORNIA          

P:  4AUG2019 117772    35.7N  117.5W 2.5-4.4 AAAAA  California/Nevada area     

 

 

 

 

MAJOR, EXPECTED EARTHQUAKE HITS OFF CENTRAL CHILE

 

EARTHQUAKE SUMMARY FOR AUGUST 1, 2019

 

An earthquake of M 6.8 hit the region off the coast of O'Higgins, Central Chile today. It follows a month-long strong seismic quiet period (quiescence) which was recognized in previous issues of this report. As it occurred on the day of the new moon within about an hour of local solar noon, a time when tidal stresses maximize, it was probably promoted at this time by tidal stresses. This summary had expected a major earthquake in this area at this time beginning in early July, 2019 as:

 

 

"The new moon will arrive on July 2 at 19:16 UT. Longitudinal areas most likely to see high tidal stresses with this event are near 80 East and 100 West.

These areas include central Asia in the east and the central U.S. in the West (including the central Plaines states where tidal triggering is common).

This new moon will include a solar eclipse. It will be visible over Central Chile and Argentina near 34S 68-75W and into the Pacific Ocean. A strong event in  Central Chile is possible as this eclipse passes. The timing of the eclipse is maximized about 20:00 UT.  A strong regional event in this active area could occur in the next four days. While these will experience the maximum tidal stress many other areas could also see enhanced seismicity in the next week." (July 1-2, 2019)

 

and

 

"A solar eclipse will be seen today in the region of southern Pacific Ocean, West Chile Rise, East Pacific Rise and Central Chile. Solar eclipses have been known to be associated with major events in South America in the past. For example, a total solar eclipse of June 21, 2001 which began over South America was accompanied by  an M 8.4 in Peru on June 23, 2001, a quake which devastated the area and killed thousands. The coincidence of these two events

was probably not happenstance. A further example is the Izmit, Turkey event of August 1999 which coincided with the most complete solar eclipse in Europe in centuries. Because this is a high southern latitude event, other areas at high southern latitudes could also see enhanced seismicity in the next several days." (July 2, 2019)

 

Later this summary noted the strange seismic behavior in in Central Chile as:

 

"What happened in Central Chile? This summary had expected the possibility of a strong quake in that region near the time of the solar eclipse and new moon of July 2 as:

 

Instead what occurred was the M 7.1 and 6.4 in Southern and Central California at the same distance north of the equator as this area of Chile is south of the equator. This region of Chile, however, does appear to have been strongly affected by the conditions associated with the solar eclipse, but not be seismic enhance but by seismic quiescence. A strong quiet period in this region of Chile began with the eclipse and continues to this day. No moderate earthquakes have been recorded in this region since the eclipse, highly unusual for this active area. The stresses appear to have dampened regional seismicity. If a strong quake should occur in early July, it is now expected near the time of the full moon near July 16." (July 7, 2019)

 

NEIC reported the mainshock at M 6.8 was felt with maximum intensity VI in Constitucion, Maule, Chile and V in San Fernando, O'Higgins. Intensity IV was reported within about 150 km of the epicenter in Valparaiso, O'Higgins, Santiage, and Maule, Chile. Aftershocks were common and included an M 5.8 and 5.4 felt with intensity III in Valparaiso, O'Higgins, and Santiago, Chile. CSN reported this event of 6.6 with intensity up to   VII. It was reported felt with maximum intensity V in Casablanca, Coquimbo, VI in Melipilla, San Jose de Maipo, San Pedro, Tiltil,  and Puente Alto, Santiago, VI in O'Higgins at Chimbarongo, Marchihue, Navidad, Paredones, Pichilemu, San Fernando, San Vicente de Tagua, V in Maule at Colbun, Constitucion, Curico, VI in Empedrado, Hualane and Llico, and Talca, IV in Biobio at Talcahuano and Tome and IV in La Araucania at Angol, Carahue and Panguipulli, Chile. The last earthquake within about 250 km of today's 6.8 in Central Chile occurred was an M 6.8-6.9 on April 24, 2017. The only events in the region of larger magnitude in the past 30 years were of M 7.0-7.1 on March 25, 2012 and March 11, 2010. Forecasts 117698 and 117917 had expected this activity within about 100 km of

the epicenters at the end of July or in early August. Today's epicenter is located at 104 degrees from the M 6.5 in Central Vanuatu yesterday and may

have been promoted by concentrated seismic energy from that source. Another factor influencing  Chilean seismicity at this time is a series

of Tropical Cyclones which have been occurring west of the Philippines and north to Japan. These are near the antipode of the event in Chile.

 

O: 02AUG2019 00:55:17  34.2S   72.2W Mw=5.4  EMSC   OFFSHORE O'HIGGINS, CHILE

O: 01AUG2019 18:28:06  34.2S   72.2W Mw=6.8  EMSC   OFFSHORE O'HIGGINS, CHILE

O: 01AUG2019 19:36:26  34.2S   72.2W mb=4.9  EMSC   OFFSHORE O'HIGGINS, CHILE

O: 02AUG2019 00:09:13  34.2S   72.3W Mw=4.2  EMSC   OFFSHORE O'HIGGINS, CHILE

O: 02AUG2019 06:41:42  34.2S   72.3W Mw=4.6  EMSC   OFFSHORE O'HIGGINS, CHILE

O: 01AUG2019 20:01:27  34.3S   72.3W Mw=5.8  EMSC   OFFSHORE O'HIGGINS, CHILE

O:  2AUG2019 06:50:51  34.2S   72.2W Mw=4.6  EMSC   OFFSHORE O'HIGGINS, CHILE    

O:  1AUG2019 18:28     34.3S   72.5W mb=6.6  GUC    Felt with maximum intensity V

P:  4AUG2019 117917    34.0S   72.0W 4.0-6.4 AAAAA  Central Chile              

P: 25JUL2019 117698    35.0S   72.0W 4.0-5.5 CAAAA  Central Chile              

 

An earthquake of M 4.9 in the Northern Mid-Atlantic today was probably triggered by seismic waves from the M 5.4 in Northern Territory, Australia yesterday. This summary had noted this possibility in the previous issue as:

 

 

"A moderate earthquake of M 5.4 hit the northern Territory, Australia today. NEIC reported this earthquake of M 5.4 in Northern Territory, Australia was felt with intensity II-III in the area(s) of Tennant Creek, Northern Territory, Australia. This continues activity which has included an M 6.6 off western Australia in  mid-July. This is the strongest earthquake in the Tennant Creek area of northern Territory in at least 30 years. This earthquake is located at 105 degrees from the M 7.1 in Central California of July 6 and was probably promoted by energy from that source. The antipode is in the northern Mid-Atlantic at 20N 45W where a possible event could occur." (August 1, 2019)

 

The last earthquake of M>=4.9 within about 200 km of this epicenter in the northern mid-Atlantic occurred April 12, 2019 also with M 4.9. The last of larger magnitude in the  area was an M 5.5 on September 9, 2016. Forecast 117549 expected today's event around August 31 within about 25 km of the epicenter.

 

O:  1AUG2019 17:55:01  21.0N   45.7W mb=4.9  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 31JUL2019 117549    21.0N   46.0W 4.0-5.4 AAAAA  Mid-Atlantic Ridge         

 

Light aftershocks also continued in the Tennant Creek area of Northern Territory, Australia. Forecast 117915 had expected this activity which was within about 100 km of the exact antipode of the event in the Northern Mid-Atlantic. Seismic energy is focused at the antipode (the exact opposite point on the earth's surface) due to the spherical shape of the earth and ground motion can be quite large in this area following major earthquakes at the antipode.

 

O:  1AUG2019 22:51:29  19.8S  133.9E ML=2.5  EMSC   NORTHERN TERRITORY, AUSTRALIA

P:  3AUG2019 117915    19.0S  133.0E 2.0-3.3 BAAAA  Central Australia          

 

A moderately strong earthquake of M 5.4 also occurred in the southern East Pacific Rise today. It may have been promoted by energy from the nearby M 6.8 in Chile. Tidal stresses probably also helped in the timing of this event which occurred near local solar midnight. It was not felt in this remote oceanic region. The last earthquake within about 250 km of this epicenter with M>=5.4 occurred as an M 5.8-6.4 more than five years ago on May 12, 2014.

Forecast 117932 had expected today's event in this area was likely in early August.

 

O:  2AUG2019 05:50:54  49.8S  113.9W mb=5.4  EMSC   SOUTHERN EAST PACIFIC RISE   

P:  8AUG2019 117932    50.0S  116.0W 4.0-5.3 CABAA  East Pacific Rise          

 

STRONG QUAKE IN VANUATU LIKELY TIDALLY PROMOTED

 

EARTHQUAKE SUMMARY FOR JULY 31, 2019

 

A strong M 6.5 earthquake occurred today in central Vanuatu. It occurred near local solar midnight and may have been promoted by tidal stresses which maximize at this hour. This is the strongest earthquake in central Vanuatu within about 150 km of this epicenter since an M 7.0 on April 28, 2016. Forecast 117682 had expected Vanuatu to be active in late July. While activity in the Loyalty Islands has been common in the past three years, earthquakes in Vanuatu of M>=6.5 have included only one event in this time period. 

 

O: 31JUL2019 19:11:45  16.2S  167.9E mb=5.0  EMSC   VANUATU                      

O: 31JUL2019 15:02:35  16.2S  168.0E Mw=6.5  EMSC   VANUATU                       

P: 28JUL2019 117682    13.0S  167.0E 4.0-5.3 BCAAA  Vanuatu Islands            

 

A moderate earthquake of M 5.4 hit the northern Territory, Australia today. NEIC reported this earthquake of M 5.4 in Northern Territory, Australia was felt with intensity II-III in the area(s) of Tennant Creek, Northern Territory, Australia. This continues activity which has included an M 6.6 off western Australia in  mid-July. This is the strongest earthquake in the Tennant Creek area of northern Territory in at least 30 years. This earthquake is located at 105 degrees from the  M 7.1 in Central California of July 6 and was probably promoted by energy from that source. The antipode is in the northern Mid-Atlantic at 20N 45W where a possible event could occur.

 

O:  1AUG2019 01:22:16  19.9S  133.8E mb=5.4  EMSC   NORTHERN TERRITORY, AUSTRALIA

 

Among areas which are at 103 degrees from Vanuatu is the region of central Chile. This distance often sees seismic enhancement following large event such as the M 6.5 in Vanuatu today. So, what is happening in Central Chile? At the time of the last new moon, this summary noted that the solar eclipse associated with that alignment passed over this area and that significant changes in seismicity were likely around 34 South latitude in Central Chile. In the meantime the area has seen no significant activity with a quiet far beyond background in the region. With today's new moon we are reminded that a strong earthquake is likely at this time as noted in previous summaries:

 

 

"The new moon will arrive on July 2 at 19:16 UT. Longitudinal areas most likely to see high tidal stresses with this event are near 80 East and 100 West. These areas include central Asia in the east and the central U.S. in the West (including the central Plaines states where tidal triggering is common). This new moon will include a solar eclipse. It will be visible over Central Chile and Argentina near 34S 68-75W and into the Pacific Ocean. A strong event in  Central Chile is possible as this eclipse passes. The timing of the eclipse is maximized about 20:00 UT. A strong regional event in this active area could occur in the next four days. While these will experience the maximum tidal stress many other areas could also see enhanced seismicity in the next week." (July 1-2, 2019)

 

The current tidal forecast states:

 

The new moon arrived on August 1 at 03:12 UT. Areas which were sub-solar at this time include those near 135 East and those which are anti-solar at 45 West longitude These include regions of Japan and Indonesia in the east and the central Atlantic and Caribbean and western South America in the west. While these areas are most likely to see tidal triggering in the next seven days, other areas can also see a significant tidal triggering. Watch for regions where significant quakes occur near local solar noon or midnight for tidally triggered foreshocks.

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in the Fox Islands, Aleutians, Alaska. It was not reported felt. It was probably promoted by high tidal stresses as it occurred within about 30 minutes of local solar noon, a prime time for such stresses to maximize. The last event of M>=3.7 within about 150 km of this epicenter in the Fox Islands was an M 4.0 on July 5, 2019, Forecast 117641 had expected today's earthquake was likely at the end of July.

 

O: 31JUL2019 22:45:45  51.9N  171.8W mb=3.7  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 27JUL2019 117641    52.1N  171.3W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

STRONG QUAKE OFF EL SALVADOR PROBABLY TIDALLY PROMOTED

 

EARTHQUAKE SUMMARY FOR JULY 30, 2019

 

The strongest earthquake in the world today was an M 5.9 off the south coast of El Salvador. NEIC reported it was felt in El Salvador with intensity V in La Libertad, Nuevo Cuscatlan, Nueva San Salvador, Antiguo Cuscatlan, San Marcos, and San Salvador and III-IV in Rosario de Mora, El Rosario La Paz, Santo Tomas and San Luis la Herradura. The earthquake occurred within about 2 minutes of local solar midnight and was likely promoted by strong tidal stresses which maximize at this hour. The tidal forecast associated with the next new moon had read:

 

"The new moon arrives on August 1 at 03:12 UT. Areas which are sub-solar at this time include those near 135 East and those which are anti-solar at 45 West longitude These include regions of Japan and Indonesia in the east and the central Atlantic and Caribbean in the west. While these areas are most likely to see tidal triggering in the next seven days, other areas can also see a significant tidal triggering. Watch for regions where significant quakes occur near local solar noon or midnight for tidally triggered foreshocks." (July 29-30, 2019).

 

This area has been active in the past year with an M 6.6 on May 30, 2019 and an M 6.1 on October 28, 2018. Today's event appears to be an aftershock of the May quake. Forecast 117524 had expected today's earthquake was likely within about 50 km of this epicenter around July 31.

 

O: 31JUL2019 05:54:56  13.4N   89.2W Mw=5.9  EMSC   OFFSHORE EL SALVADOR         

P: 31JUL2019 117524    14.0N   89.0W 3.5-5.0 AAAAA  Coast of Central America   

 

An earthquake of M 5.0 in Crete, Greece was widely felt within about 100 km of the epicenter today in Iraklion and Rethimni, Greece. NEIC reported maximum intensity IV in Iraklion and III in Gazion, Nea Alikarnassos, Anoyia, Panormos, Perama, Gournai, Kato Gouvai, Limin Khersonisou and Anissaras, Greece. This appears to be part of the regional activation of the area of Greece which followed the M 7.1 in Central California of July 6. The epicenter is located at  102 degrees from the event in California, a distance at which seismic energy is concentrated on the surface after strong earthquakes. It was probably promoted from the California activity. Forecast 117572 had expected activity in Crete within about 100 km of this epicenter was likely at the end of July.

 

O: 31JUL2019 04:40:03  35.3N   25.0E Mw=5.0  EMSC   CRETE, GREECE                

P: 27JUL2019 117572    34.0N   25.0E 3.0-4.3 BBAAA  Crete                       

 

A moderate earthquake of M 4.5 also occurred today in the Ionian Sea of Greece. A similar event of M 4.5 occurred on July 21 and an M 4.7 in the Ionian Sea on July 13 about 150 km north of today's epicenter. Forecast 117557 had expected today's event was likely within about 50 km of the epicenter around July 30.

 

O: 30JUL2019 10:36:22  37.4N   20.4E mb=4.5  EMSC   IONIAN SEA                   

P: 30JUL2019 117557    37.0N   21.0E 3.0-4.5 AAAAA  Aegean Sea                 

 

The strongest earthquake in the U.S. or Canada today was an M 3.5-3.6 in central Kansas. NEIC reported two events of M 3.1 and 3.7. These earthquakes of M 3.1 and 3.7 in Central Kansas  were felt with intensity II-III in the area(s) of Kansas at New Cambria, Solomon, Salina, Gypsum, Minneapolis, Chapman, Miltonvale, Clay Center, North Newton and Barnes. This is an unusual epicenter for an earthquake of this magnitude. It is the strongest within about 100 km of the epicenter in at least 30 years. A series of M 3.6, 3.7 and 3.7 occurred about 150 km northwest of this on June 12 and 13, 2017, the only other such activity in the area in the past 30 years. Forecast 117598 had expected today's activity around July 26.

 

O: 30JUL2019 09:30:21  38.8N   97.4W mb=3.5  EMSC   KANSAS                       

P: 26JUL2019 117598    39.0N   99.0W 2.0-3.9 BAAAA  Southern Plains            

THIRD MODERATE QUAKE TRIGGERED BY TROPICAL STORM NARI

 

EARTHQUAKE SUMMARY FOR JULY 29, 2019

 

Tropical Storm Nari triggered another moderately large earthquake today in southeastern Honshu, Japan. NEIC reported this event in the Izu Islands of M 5.7 was felt with intensity III in Kanagawa, and Chiba Prefectures, Japan. This summary has followed the sequence of earthquakes apparently triggered by atmospheric unloading associated with TS Nari. In the previous summary it was noted:

 

 

"An earthquake of M 4.6 occurred today in the region of Tokyo, Japan.  NEIC reported this earthquake of M 4.6 in SE Honshu, Japan was felt with intensity II-III in the area(s) of Ibaraki, Chiba and Tokyo, Japan. The remnants of Tropical Storm Nari were over this epicenter at the time of this earthquake. This was probably triggered by low atmospheric pressures over the epicenter. Further moderate to strong seismicity in southeaster Honshu can still occur as Nari passes slowly through the region.  This was discussed in detail in the previous summary as:

 

"While this summary has cited many examples over the past 40+ years of weather-related seismicity, many have hesitated to accept scientific and coincidental evidence that strong low pressure systems such as TS Nari could help trigger significant seismicity. In this case, the evidence is clear. A low pressure system was situated directly over a subsequent major earthquake at the time that the earthquake occurred. This is a classic case of vertical unloading of pressure much as occurs in  reservoir loading/unloading. The later is generally acknowledged as a case of cause and effect." (July 28, 2019)

 

Seismic instability with low pressure systems may be an indication of a possible upcoming large earthquake. This is most likely with a major typhoon over the area." (July 29, 2019)

 

This event of M 5.7 is the strongest in the Izu Islands, Japan within about 150 km of this epicenter since an M 5.7 on March 25, 2018 and prior to that an M 5.8 on November 16, 2017. Forecast 117584 had expected today's event within about 50 km was likely around July 27.

 

O: 29JUL2019 20:37:44  32.8N  140.6E Mw=5.7  EMSC   IZU ISLANDS, JAPAN REGION    

P: 27JUL2019 117584    33.0N  140.0E 4.0-5.3 AAAAA  Off East Coast Honshu      

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the Rat Islands, Aleutians. This is the strongest earthquake in the Rat Islands within about 150 km of this epicenter since an M 5.3 on April 14, 2019. Both are probably aftershocks of an M 6.4 in the Rat Islands of April 2. Forecast 117651 expected today's event was likely around July 31.

 

O: 30JUL2019 06:36:34  51.3N  178.3E mb=4.6  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 31JUL2019 117651    50.0N  178.0E 4.0-5.6 ABAAA  Rat Islands                

 

A series of minor earthquake in northern Germany were lightly felt today. Light earthquakes in Germany are often observed but a swarm such as occurred today is unusual. The largest of these was an M 3.7, the strongest within  Germany within about 150 km of this epicenter since an M 3.8 on February 1, 2018 and prior to that an M 4.0 on January 17, 2018.  Forecast 117605 had expected this activity to the south was likely around July 28.

 

 

O: 30JUL2019 00:42:41  47.7N    9.1E ML=3.2  EMSC   GERMANY                      

O: 29JUL2019 23:17:47  47.8N    9.1E ML=3.7  EMSC   GERMANY                      

P: 28JUL2019 117605    45.0N    9.0E 3.0-5.0 ACAAA  Austria                    

 

MODERATE QUAKES SHAKE NORTHERN CARIBBEAN

 

EARTHQUAKE SUMMARY FOR JULY 28, 2019

 

A moderate M 4.2 was widely felt in the Virgin Islands today. NEIC reported maximum intensity in the U.S. Virgin Islands of IV at Saint Thomas and Saint John and in the British Virgin Islands at Road Town, Tortola. Lesser shaking was reported in Puerto Rico at Culebra, Fajardo, Loiza, and Humancao. A foreshock of M 3.4 was felt in Saint John, San Juan, Puerto Rico and in Saint Kitts and Nevis. The last earthquake in the Virgin Islands of M>=4.3 was an M 4.4 on April 16, 2019 and prior to that an M 4.8 on February 18, 2019. An M 4.4 also occurred in the area a year ago on July 21, 2018. Forecast 117528 had expected today's activity within about 50 km of this epicenter was likely around July 31.

 

O: 28JUL2019 17:07:07  18.6N   64.2W Md=3.4  EMSC   VIRGIN ISLANDS REGION

O: 29JUL2019 03:24:12  19.2N   64.8W Md=3.3  EMSC   VIRGIN ISLANDS REGION

O: 28JUL2019 21:41:42  18.4N   65.0W mb=4.3  EMSC   VIRGIN ISLANDS REGION        

P: 31JUL2019 117528    18.0N   65.0W 3.0-4.8 AAAAA  Leeward Islands            

 

The M 4.2 in the Virgin Islands followed an M 4.6-4.7 in the Dominican Republic to the west. That event was reported felt with intensity V in La Romana and III in Santo Domingo and El Carril, Dominican Republic. NEIC reported an aftershock of M 3.4 in the Dominican Republic was felt with intensity II-III in the area(s) of Santo Domingo, Dominican Republic. This is the strongest earthquake within about 100 km of this epicenter in the Dominican Republic since an M 5.3 on February 4, 2019 and prior to that an M 5.8 on May 28, 2014. Forecasts 117538 and 117537 had expected this activity around July 26-28.

 

O: 29JUL2019 03:49:06  18.0N   68.5W ML=3.3  EMSC   DOMINICAN REPUBLIC REGION

O: 28JUL2019 16:02:10  18.5N   68.9W mb=4.6  EMSC   DOMINICAN REPUBLIC

O: 28JUL2019 16:02:10  18.6N   69.0W mb=4.7  ANSS   DOMINICAN REPUBLIC

O: 28JUL2019 16:13:18  18.5N   69.0W ML=3.8  EMSC   DOMINICAN REPUBLIC

O: 28JUL2019 07:41:26  18.8N   70.4W ML=3.1  EMSC   DOMINICAN REPUBLIC

O: 28JUL2019 21:00:24  19.2N   67.8W Md=3.2  EMSC   DOMINICAN REPUBLIC REGION

O: 28JUL2019 08:24:55  19.5N   67.8W Md=3.2  EMSC   DOMINICAN REPUBLIC REGION    

P: 26JUL2019 117538    18.0N   69.0W 3.4-4.9 AAAAA  Puerto Rico                 

P: 28JUL2019 117537    18.0N   68.0W 3.4-4.8 AAAAA  Puerto Rico                

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in Central Alaska. NEIC reported it was felt with intensity IV in Eagle River, Alaska and II in Wasilla, Alaska. This is the strongest earthquake within about 100 km of this epicenter since an M 5.0 on July 10, 2018. Forecast 117661 had expected today's activity around July 29.

 

O: 28JUL2019 10:18:57  63.2N  150.5W mb=4.6  EMSC   CENTRAL ALASKA                

P: 25JUL2019 117663    63.3N  151.0W 3.2-4.8 BAAAA  Central Alaska             

P: 29JUL2019 117661    62.8N  149.1W 3.2-4.9 AAAAA  Central Alaska             

 

An earthquake of M 4.6 occurred today in the region of Tokyo, Japan.  NEIC reported this earthquake of M 4.6 in SE Honshu, Japan was felt with intensity II-III in the area(s) of Ibaraki, Chiba and Tokyo, Japan. The remnants of Tropical Storm Nari were over this epicenter at the time of this earthquake. This was probably triggered by low atmospheric pressures over the epicenter. Further moderate to strong seismicity in southeaster Honshu can still occur as Nari passes slowly through the region.  This was discussed in detail in the previous summary as:

 

 

"While this summary has cited many examples over the past 40+ years of weather-related seismicity, many have hesitated to accept scientific and coincidental evidence that strong low pressure systems such as TS Nari could help trigger significant seismicity. In this case, the evidence is clear. A low pressure system was situated directly over a subsequent major earthquake at the time that the earthquake occurred. This is a classic case of vertical unloading of pressure much as occurs in  reservoir loading/unloading. The later is generally acknowledged as a case of cause and effect." (July 28, 2019)

 

Seismic instability with low pressure systems may be an indication of a possible upcoming large earthquake. This is most likely with a major typhoon over the area. Forecast 117584 had expected today's earthquake was likely within about 100 km of this epicenter around July 27.

 

O: 28JUL2019 15:34:58  35.8N  141.0E mb=4.6  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 27JUL2019 117584    36.0N  142.0E 4.0-5.3 AAAAA  Off East Coast Honshu      

 

TROPICAL STORM NARI TRIGGERS STRONG QUAKE IN SOUTHERN HONSHU, JAPAN

 

EARTHQUAKE SUMMARY FOR JULY 27, 2019

 

The strongest earthquake in the world today occurred near the South coast of Honshu, Japan with M 6.3. NEIC reported it was felt with intensity II-III in Japan at Shizuoka, Osaka, Kyoto, Kanagawa, Yamanashi Prefectures, Japan. It was a deep focus earthquake did little damage on the surface. This event occurred as Tropical Storm Nari was passing over the epicenter. Associated seismicity with Nari had been expected as noted in previous issues of this summary:

 

"As the first major storms in the area of Japan and the Philippines this season, Danas and Nari - a new storm approaching southern Japan from the south -  could increase seismicity in Honshu as it passes through that area as well as noted in previous issues:

 

"TS Nari (Tropical Depression 07W) continued  south of Japan (at 34N 135E) today with winds up to 45 kts. This system is currently moving northward. It may strengthen and impact southern Japan early next week. A seismic watch may be called for Honshu if that occurs." (July 25-27, 2019)

 

While this summary has cited many examples over the past 40+ years of weather-related seismicity, many have hesitated to accept scientific and coincidental evidence that strong low pressure systems such as TS Nari could help trigger significant seismicity. In this case, the evidence is clear. A low pressure system was situated directly over a subsequent major earthquake at the time that the earthquake occurred. This is a classic case of vertical unloading of pressure much as occurs in  reservoir loading/unloading. The later is generally acknowledged as a case of cause and effect. Those who for scientific or political rationale are urged to rethink their conclusions in light of today's event in Japan.

 

Today's earthquake is the strongest within about 300 km of this epicenter since an M 6.8 on January 1, 2012 and prior to that as an M 7.1 on August 9, 2009 nearly 10 years ago. Forecast 117570 had expected today's event within about 50 km was likely around July 24.

 

The quake of August 9, 2009 of M 7.1 in the same area was similarly associated with a tropical storm as noted at the time in this summary:

 

 

"TD 10W formed southwest of Japan today with winds of 30 kts. It is  expected to turn north and pass over Tokyo around August 10. A moderate to large earthquake in the region of Honshu is certainly a possibility during the typhoon or for several days after. The area is being placed on seismic watch with expected magnitudes as much as 1.5 units over those previously anticipated for events in this area. An event of M 4.9 hit near the eye of this storm today in the Bonin Islands." (August 8, 2009)

 

The eye of this storm was within about 100 km of today's epicenter at the time of the earthquake." (August 10, 2009)

 

O: 27JUL2019 18:31:08  33.2N  137.3E Mw=6.3  EMSC   NEAR S. COAST OF HONSHU, JAPAN

P: 24JUL2019 117570    33.0N  137.0E 3.5-4.8 BAAAA  Central/So. Honshu Japan   

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in Central California south of San Francisco.  NEIC reported this earthquakes of M 3.1 and M 3.8 in Central California was felt with intensity II-III in the area(s) of Gonzales, Soledad, Paicines, Greenfield, Hollister, Salinas, Marina, Carmel Valley, California. This is the strongest earthquake in this section since an M 4.1 on November 2, 2018 and prior to that an M 3.8 on October 5, 2018. A moderate quake hit the area with  M 4.6 on November 13, 2017. Forecast 117565 and 117585 had expected this activity was likely around July 25-28.

 

O: 27JUL2019 09:56:06  36.7N  121.3W ML=3.1  EMSC   CENTRAL CALIFORNIA

O: 27JUL2019 08:57:39  36.7N  121.3W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 28JUL2019 02:40:13  36.7N  121.3W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 28JUL2019 02:48:15  36.7N  121.3W Md=2.5  EMSC   CENTRAL CALIFORNIA

O: 27JUL2019 09:37:41  36.7N  121.3W Mw=3.8  EMSC   CENTRAL CALIFORNIA

O: 27JUL2019 14:04:16  36.5N  121.1W Md=2.2  EMSC   CENTRAL CALIFORNIA           

P: 25JUL2019 117565    36.2N  121.8W 2.5-4.3 AAAAA  Central California         

P: 28JUL2019 117585    35.7N  121.2W 2.5-4.3 AAAAA  Off So. California         

 

STRONG SEISMICITY IN NORTHERN PHILIPPINES/TAIWAN ASSOCIATED WITH TS DANAS

 

EARTHQUAKE SUMMARY FOR JULY 26, 2019

 

The strongest earthquake in the world today was an M 6.0 in the northern Philippines. NEIC reported maximum intensity VIII for this event in Basco Cagayan Valley and III in Taitung and Taipei, Taiwan. An aftershock of  M 5.7 in Northern Philippines was felt with intensity VII in Basco, Cagayan Valley, Philippines and II-III in the area(s) of Taitung, Taiwan.

Seismicity in this region began several days ago as reported in the previous issue of this report:

 

 

"Moderate earthquakes continued in the Batan Island region of the Philippines today with an M 4.7 recorded. This activity began shortly after Tropical Storm Danas passed through the region on July 18 with an M 4.9 on July 22  as expected in this summary at the time:

 

"TS Danas continued today north of the Philippines west of the Ryukyu Islands with winds up to 045 kts. It is expected to track to the north possibly bringing enhanced seismicity to the Northern Philippines and Taiwan in the next several days." (July 18, 2019)

 

As the first major storms in the area of Japan and the Philippines this season, Danas and Nari - a new storm approaching southern Japan from the south -  could increase seismicity in Honshu as it passes through that area as well  as noted in previous issues:

 

 

"TS Nari (Tropical Depression 07W) continued  south of Japan (at 34N 135E) today with winds up to 45 kts. This system is currently moving northward. It may strengthen and impact southern Japan early next week. A seismic watch may be called for Honshu if that occurs." (July 25-26, 2019)

 

"TS Danas continued today north of the Philippines west of the Ryukyu Islands with winds up to 045 kts.  It is expected to track to the north possibly bringing enhanced seismicity to the Northern Philippines and Taiwan in the next several days." (July 18-29, 2019)

 

Forecast 117554 had expected today's activity was likely around July 23. These events are at 101 degrees from the M 7.1 in Central California of July 6 and were probably promoted by energy concentrated on the surface at this distance from California as noted in previous issues of this summary.

 

 

"(earthquakes at or near) 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying ma by stipled white lines." (July 6-8, 10-13, 26, 2019)

 

CWB reported today’s earthquake was felt with intensity II in Taitung and I in Pingtung, Kaohsiung, Yunlin, Changhua and Taichung Counties, Taiwan. NEIC reported the associated quake of M 5.7 in Northern Philippines was felt with intensity VII in Basco, Cagayan Valley, Philippines and II-III in the area(s) of Taitung, Taiwan. The last earthquake with M>=5.9 in the Batan Island Region of northern Philippines within about 200 km of this epicenter occurred nearly six years ago on September 6, 2013 also with M 6.0. The last of larger magnitude was an M 6.2 on July 13, 2008.  Forecast 117554 had expected regional activity at the end of July.

 

O: 26JUL2019 20:16:57  20.7N  122.0E Mw=5.4  EMSC   BATAN ISL REGION, PHILIPPINES

O: 26JUL2019 23:58:56  20.7N  122.0E mb=4.5  EMSC   BATAN ISL REGION, PHILIPPINES

O: 27JUL2019 03:19:42  20.8N  122.0E mb=4.6  EMSC   BATAN ISL REGION, PHILIPPINES

O: 27JUL2019 01:24:43  20.8N  122.1E Mw=5.7  EMSC   BATAN ISL REGION, PHILIPPINES

O: 26JUL2019 23:37:58  20.8N  122.1E Mw=5.9  EMSC   BATAN ISL REGION, PHILIPPINES

O: 26JUL2019 23:37:58  20.8N  122.0E Mw=6.0  ANSS   BATAN ISL REGION, PHILIPPINES

O: 26JUL2019 08:13:48  20.9N  121.9E mb=4.7  EMSC   BATAN ISL REGION, PHILIPPINES

O: 27JUL2019 01:24:43  20.7N  122.0E ML=6.1  TAI    Hualien, Taiwan              

P: 29JUL2019 117554    24.0N  122.0E 4.0-5.3 ACAAA  Taiwan                     

P: 23JUL2019 117554    23.0N  122.0E 4.0-5.3 BBAAA  Taiwan                     

 

The strongest earthquake in the U.S. or Canada today was an M 5.0 in the Central Andreanof Islands, Alaska. It was preceded by an M 4.6 foreshock. Neither of these events were reported felt in this remote epicentral area. The last earthquake within about 100 km of today's epicenters with M>=5 was an M 5.1 on March 7, 2019 and prior to that an M 5.2 on July 9, 2018. Forecast 117641 had expected today's activity within this area at the end of July.

 

O: 27JUL2019 06:40:10  51.3N  174.8W Mw=4.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 26JUL2019 21:14:48  51.3N  174.9W mb=5.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 31JUL2019 117641    52.3N  174.6W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

There were no earthquake of M>=4 today in the Ridgecrest, California aftershock zone. A listing of events of M>=2.5 can be found in the "CALIFORNIA" section of this report.

 

An aftershock of M 4.5 occurred in southern New Zealand in the Snares Island area. When the first of this series occurred on July 17, this summary noted:

 

"A series of moderate earthquakes with maximum M 5.3, 4.9 and 4.7 was felt with weak intensity in the Snares Island region of Southern South Island, New Zealand today. GEONET reported these events were felt with weak intensity by one person.

This activity is at 106-107 degrees from the M 7.1 in Central California of July 6 and may have been promoted from this source as noted in previous summaries:

 

"(earthquakes at or near) 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying ma by stipled white lines." (July 6-15, 2019)

 

The last earthquake recorded by GEONET in the Snares Island region with M>=5.3 was an M 5.8 on November 24, 2018 and prior to that an M 5.7 on October 13, 2014. Forecast 117489 had expected moderate seismicity in this area around July 14." (July 18, 2019)

 

GEONET reported today's earthquake was felt with light intensity in the area of northern North Island,  New Zealand. 196 persons reported feeling this earthquake with 172 of weak  intensity; 23 with light intensity and 1 with moderate shaking.

 

 

O: 26JUL2019 13:12:34  48.5S  164.8E ML=4.5  GEONET Felt with weak intensity by on

P: 24JUL2019 117706    47.0S  165.0E 3.0-4.8 ABAAA  Southern S. Isl. N.Z.      

 

MODERATE AFTERSHOCK IN CENTRAL CALIFORNIA WIDELY FELT

 

EARTHQUAKE SUMMARY FOR JULY 25, 2019

 

The strongest earthquake in the U.S. or Canada today was a moderate M 4.7-4.8 aftershock north of Ridgecrest, California. NEIC reported it was felt with intensity II-III in California at Inyokern, Ridgecrest, Trona, Kernville, Weldon, Lake Isabella and Wofford Heights. This is the strongest aftershock of the M 7.1 Ridgecrest event of July 6 since an M 4.9 on July 12, 2019, the only such event since July 6. Forecasts 117593, 117558 had expected this activity was likely around July 24-27. A listing of M>=2.5 aftershocks in the area which occurred today can be found in the "CALIFORNIA" section of this report.

 

O: 26JUL2019 00:42:47  35.9N  117.7W Mw=4.8  EMSC   CENTRAL CALIFORNIA           

P: 24JUL2019 117593    35.7N  117.7W 2.5-4.3 AAAAA  So. California             

P: 25JUL2019 117558    36.1N  118.1W 2.5-4.4 AAAAA  California/Nevada area     

P: 27JUL2019 117593    35.7N  118.1W 2.5-4.3 AAAAA  So. California              

 

An unusual M 4.7 shook the area of Guadeloupe, Leeward Islands, today. NEIC reported maximum intensity IV in Guadeloupe at Saint-Francois, La Moule, Sainte-Anne, Le Gosier, Point-a-Pitre and Petit-Bourg. It was also felt with ligher intensity in Dominica and within about 100 km of the epicenter. This event may have been promoted by energy from Western Australia - at the antipode to today's Guadeloupe epicenter. This is the strongest event in the Guadeloupe area since an M 5.4 about 150 km to the south on September 28, 2018 and prior to that an M 5.0 on April 5, 2018. Forecasts 117377 and 117528 had expected activity in this area was likely in mid-July.

 

O: 25JUL2019 10:15:09  16.1N   61.0W mb=4.7  EMSC   GUADELOUPE REGION, LEEWARD ISL

P: 15JUL2019 117377    15.0N   60.0W 3.0-4.9 CBAAA  Leeward Islands            

P: 24JUL2019 117528    18.0N   64.0W 3.0-4.8 ABCAA  Leeward Islands            

 

An earthquake of M 4.5 off the northern coast of Western Australia also occurred today. This is the strongest aftershock of the M 6.6 on July 14, 2019, but an M 4.5 also occurred on July 20, 2019. Forecast 117696 had expected this activity was likely around July 24. When the original M 6.6 hit off western Australia, this summary noted a possible relation to an upcoming event in the Leeward Islands as:

 

 

"A strong M 6.6 earthquake was located off the coast of western Australia today. NEIC reported it was felt with maximum intensity V in Broome, and IV in Port Hedland. Karratha and Darwin, Western Australia and within about 1500 km of the epicenter. This is an area where strong tropical cyclones often make landfall in Australia. This summary has previously linked these events to increased antipodal seismicity in the northern Caribbean. Today's event is antipodal to the Virgin Islands and Puerto Rico. In the past issue of this summary it had been noted in this regard:

 

"The lull period in the northern Caribbean commented on in this summary also appeared to dissipate. The hurricane season often brings enhanced seismicity to this region, and it's antipode north of Australia and south of Sumbawa." (July 12-14, 2019)

 

 

O: 25JUL2019 19:06:13  18.3S  120.3E ML=4.5  EMSC   WESTERN AUSTRALIA            

P: 24JUL2019 117696    18.0S  120.0E 2.0-3.3 AAAAA  Western Australia          

 

Seismicity in Hawaii also continued to increase today, perhaps preceding a new eruptive phase of Kilauea. The largest of today's events was an M 3.6. NEIC reported this earthquake of M 3.6 in Hawaii was felt with intensity II-III in the area(s) of Hawaii National Park, Volcano and Kamuela, Hawaii. An earlier M 3.1 was reported felt with intensity II-III in Holualoa and Naalehu, Hawaii. The last such activity in Hawaii occurred at the beginning ofJuly - on July 2 and 4 with M 3.7 and 3.8 and prior to that as an M 4.2 on April 28, 2019. Forecast 117527 had expected this activity was likely around July 26.

 

O: 25JUL2019 03:00:46  19.3N  155.2W Ml=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

O: 26JUL2019 06:43:52  19.4N  155.3W ML=3.6  EMSC   ISLAND OF HAWAII, HAWAII     

O: 25JUL2019 12:38:50  19.4N  155.6W Ml=3.1  EMSC   ISLAND OF HAWAII, HAWAII     

P: 26JUL2019 117527    18.8N  155.2W 3.0-4.4 AAAAA  Hawaii                     

 

Moderate earthquakes continued in the Batan Island region of the Philippines today with an M 4.7 recorded. This activity began shortly after Tropical Storm Danas passed through the region on July 18 with an M 4.9 on July 22  as expected in this summary at the time:

 

"TS Danas continued today north of the Philippines west of the Ryukyu Islands with winds up to 045 kts. It is expected to track to the north possibly bringing enhanced seismicity to the Northern Philippines and Taiwan in the next several days." (July 18, 2019)

 

Forecast 117554 had expected today's activity was likely around July 23. These events are at 101 degrees from the M 7.1 in Central California of July 6 and were probably promoted by energy concentrated on the surface at this distance from California as noted in previous issues of this summary.

 

 

"(earthquakes at or near) 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying ma by stipled white lines." (July 6-8, 10-13 2019)

 

O: 26JUL2019 08:13:48  20.9N  121.9E mb=4.7  EMSC   BATAN ISL REGION, PHILIPPINES

P: 23JUL2019 117554    23.0N  122.0E 4.0-5.3 BCAAA  Taiwan                      

 

MODERATE QUAKE SHAKES OKLAHOMA

 

EARTHQUAKE SUMMARY FOR JULY 24, 2019

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in Oklahoma. NEIC reported it was felt with maximum intensity IV in Oklahoma City and Omega, and II-III in Kingfisher, Okarche, Crescent, Yukon, and Bethany among others in Oklahoma. NEIC reported an aftershock of M 2.8 in Oklahoma was felt with intensity IV in Oklahoma City and II-III in the area(s) of Yukon and Bethany, Oklahoma An earlier M 3.0 was felt with intensity III in Enid and Shawnee, Oklahoma. Only one other earthquake in Oklahoma in the past year has had M>=4 - an M 4.4 northeast of today's epicenter on May 27, 2019. Forecast 117598 had expected today's  earthquakes within about 25 km of the epicenter around July 25.

 

O: 25JUL2019 07:35:56  35.8N   98.1W mb=2.3  EMSC   OKLAHOMA                     

O: 25JUL2019 06:02:34  35.8N   98.1W mb=2.4  EMSC   OKLAHOMA                     

O: 24JUL2019 23:25:51  35.8N   98.1W mb=3.3  EMSC   OKLAHOMA                     

O: 25JUL2019 05:48:18  35.9N   98.1W mb=3.9  EMSC   OKLAHOMA                     

O: 25JUL2019 05:48:18  35.9N   98.1W ml=4.0  ANSS   12km W of Kingfisher

O: 25JUL2019 02:36:32  36.0N   98.1W mb=2.9  EMSC   OKLAHOMA                     

P: 25JUL2019 117598    36.0N   98.0W 2.0-3.8 AAAAA  Southern Plains            

 

The strongest earthquake in the world today was an M 5.2 in the Central Mid-Atlantic Ridge. It followed an M 4.9 south of this about three hours earlier. Neither of these event was reported felt in this remote area. The M 5.2 is an unusual event, the first of M>=5.2 within about 150 km of this epicenter  in more than 30 years and the first between 8.6 and 10.5N in this time period. Forecast 117493 had expected an event to the southeast of this was likely around July 25.

 

O: 24JUL2019 15:38:31   5.6N   32.9W mb=4.9  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 21JUL2019 117357     5.0N   33.0W 4.0-5.4 BAAAA  Central Mid-Atlantic Ridg  

 

O: 24JUL2019 18:57:34   9.4N   40.6W Mw=5.2  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 25JUL2019 117493     8.0N   37.0W 4.0-5.3 ABCAA  Central Mid-Atlantic Ridg  

 

STRONG M 6.0 IN BALLENY ISLANDS FOLLOWED BY ANTIPODAL ICELAND ACTIVITY

 

EARTHQUAKE SUMMARY FOR JULY 23, 2019

 

The strongest earthquake in the world today was an M 6.0 in the Balleny Islands south of New Zealand and Australia. Previous earthquakes in the past five years of M>=6 within about 300 km of today's epicenter occurred  as an M 6.1 on February 27, 2018 and October 8, 2017 with M 6.3.

 

O: 23JUL2019 10:33:23  61.3S  154.2E Mw=6.0  EMSC   BALLENY ISLANDS REGION       

 

The M 6.0 in the Balleny Islands was followed about half a day later by an M 4.2 in Iceland near the antipode.  NEIC reported this earthquake of M 4.2 in Iceland was felt with intensity IV in Saudarkrokur and II-III in the area(s) of Akureyri, Iceland. The last earthquake in Iceland within about 200 km of this epicenter with M>=4.2 occurred February 28, 2019 with M 4.4. Two events of M 4.5 occurred about 250 km southeast of today's epicenter on June 24, 2019. Forecast 117664 had expected today's activity around June 27 within about 100 km of the epicenter.  The Iceland event may have been promoted by tidal stresses as it occurred within about half an hour of local solar midnight, a time when such stresses are maximized. Focused energy from the M 6.0 in the Balleny Islands may have helped in the timing of the events in Iceland. This epicenter is also at the sixth node (60 degrees) from the M 7.1 in California of July 6.

 

 

O: 24JUL2019 00:55:57  66.2N   19.6W mb=4.2  EMSC   ICELAND REGION               

P: 27JUL2019 117664    66.0N   17.0W 3.0-4.3 BAAAA  Iceland area               

 

It is not uncommon for a strong earthquake in the Macquarie/Balleny Islands to be followed by a significant earthquake in Iceland. For example this summary documented this with the event of February 28, 2019 as:

 

 

"A near-antipodal group of earthquakes in the Macquarie Ridge south of New Zealand  Iceland and the Reykjanes Ridge in the Northern Mid-Atlantic today included the largest earthquake in the world today - the M 5.8 in the Macquarie Ridge. These events at high latitudes may have been promoted by the geomagnetic storm which was active when they occurred. An M 4.4 north of the Reykjanes Ridge and Iceland  was part of this antipodal group. Antipodal high- or low- latitude antipodal activity is not uncommon with unusually strong geomagnetic storms.

 

The earthquake in the Macquarie Ridge of M 5.8 is the largest located within  about 300 km of this epicenter since an M 6.1 about 200 km southwest of this on September 8, 2016 and prior to that an M 5.8 on June 22, 2012.

 

and

 

 

The two earthquakes of M 4.4 in Iceland had been expected in that area around February 25. They are the strongest within about 200 km of that epicenter in more than a year - since an M 5.0 on  February 19, 2018." (February 28, 2019)

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in the Ridgecrest, California aftershock zone. It was lightly felt in the area. A complete listing of M>=2.5 events today in the aftershock zone is found in the "CALIFORNIA" section of this report. Forecast 117593 expected moderate aftershocks in late July.

 

O: 23JUL2019 07:45:02  35.6N  117.4W Mw=4.1  EMSC   SOUTHERN CALIFORNIA          

P: 27JUL2019 117593    35.7N  118.1W 2.5-4.3 BAAAA  So. California             

 

The strongest earthquake in Alaska today was an M 3.8 in the Fox Islands, Aleutians.  NEIC reported this earthquake of M 3.8 in the Fox Islands, Aleutians was felt with intensity II-III in the area(s) of Nikolski, Alaska. This is probably an aftershock of an M 5.4 in the Fox Islands which occurred July 9, 2019. The strongest aftershock to date was an M 4.2 on July 17. Forecast 117645 had expected today's event in the Fox Islands was likely around July 23.

 

O: 23JUL2019 07:46:14  52.8N  168.1W mb=3.8  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 23JUL2019 117645    53.6N  166.1W 3.5-4.9 AABAA  Fox Islands, Aleutians     

 

After a slow start, a series of light earthquakes up to M 2.9 occurred today in Yellowstone National Park, Wyoming. Swarms in this area usually occur in winter months. This is the strongest event in Yellowstone since an M 3.3 on March 4, 2019.

Forecast 117637 expected today's event within about 50 km of this epicenter was likely around July 26.  This activity is at the sixth node (60 degrees) from the M 8.0 in Peru of May 26, 2019 and  was probably promoted from that source. An M 2.8 in Colorado was at the seventh node (51.5 degrees) from Peru.

 

O: 23JUL2019 06:40:29  44.6N  110.8W ML=2.9  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 23JUL2019 06:59:28  44.6N  110.8W Ml=2.1  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 23JUL2019 10:08:26  44.6N  110.8W Ml=2.4  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 26JUL2019 117637    44.2N  111.0W 2.0-3.8 BAAAA  Yellowstone/Wyoming        

UNUSUAL M 4.2 SHAKES SOUTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR JULY 22, 2019

 

The strongest earthquake in the U.S. or Canada outside Alaska today was an M 4.2 in Southern California. It was widely felt with light intensity through the region of Southern and eastern California. NEIC reported intensity II-III in California at Joshua Tree, Desert Hot Springs, Indio, Twentynine Palms, Coachella, Palm Desert, Thousand Palms, Indian Wells, Rancho Mirage and in general as far as 150 km from the epicenter. An aftershock of M 2.7 was felt with intensity III in Rancho Mirage, California. This is the strongest earthquake within about 50 km of this epicenter since an M 4.2 on June 2, 2007 but the last of larger magnitude in this area was an M 5.2 on  June 12, 2005. An event of M 4.7 occurred in the meantime about 75 km to the southwest of today's epicenter on March 11, 2013. Forecast 117592 expected today's event was likely around July 24.

 

O: 22JUL2019 19:18:39  34.0N  116.0W Ml=2.7  EMSC   SOUTHERN CALIFORNIA           

O: 22JUL2019 17:48:33  34.0N  116.1W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

O: 22JUL2019 16:26:56  34.0N  116.1W Mw=4.2  EMSC   SOUTHERN CALIFORNIA          

P: 24JUL2019 117592    34.0N  116.0W 2.5-4.3 AAAAA  So. California             

 

Light earthquakes also continued to be felt in the Ridgecrest, California aftershock zone. For example an M 2.7 near Trona was reported with intensity II-III in Chino, Riverside and Montebello, California, although some of these reports probably referred to the M 4.2 south of this. A listing of Ridgecrest aftershocks of M>=2.5 can be found in the "CALIFORNIA" area of

this summary.

 

O: 23JUL2019 01:36:17  35.8N  117.6W Mw=3.9  EMSC   SOUTHERN CALIFORNIA          

P: 24JUL2019 117593    35.7N  117.7W 2.5-4.3 AAAAA  So. California             

 

The strongest earthquake in Alaska today was an M 4.8 in the eastern Rat Islands, Aleutians. This is the largest earthquake in the Rat Islands within about 150 km of this epicenter since an M 5.3 on April 14, 2019. A strong M 6.4 hit the area on April 2, 2019.   It was not reported felt in the area. Forecast 117651 had expected this event was likely around July 27.

 

O: 22JUL2019 17:17:34  51.2N  179.4E mb=4.8  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 27JUL2019 117651    52.0N  179.0E 4.0-5.5 BAAAA  Rat Islands                

 

The strongest earthquake in the world today was an M 5.5 in the Ceram Sea of Indonesia. It was not reported felt in this area. This is the strongest earthquake within about 200 km of this epicenter in the Ceram Sea since a similar M 5.5 on April 17, 2018 and an M 5.7 on March 8,, 2018. Forecast 117519 had expected today's event was likely to the south around July 23.

 

O: 22JUL2019 10:06:56   3.5S  131.0E Mw=5.5  EMSC   CERAM SEA, INDONESIA         

P: 23JUL2019 117519     5.0S  131.0E 4.0-5.3 ABAAA  West Irian, PNG            

 

GREECE, BOSNIA AREA REMAINS ACTIVE

 

EARTHQUAKE SUMMARY FOR JULY 21, 2019

 

Two moderate earthquakes of M 4.2 each occurred today in the region of Montenegro and Bosnia and Herzegovina. This is probably a part of the activation of the region which has included an M 5.3 two days ago in Greece. At the time this summary noted in this regard:

 

"The full moon will arrive at 21:38 UT on July 16. Longitudes which are sub-solar at this time include areas of eastern Alaska, Canada and the NW U.S. Longitudes which are sub-lunar (antisolar) at this hour include areas of Greece and Turkey near 35-40 East longitude. These areas are likely to see enhanced seismicity at this time from tidal triggering." (July 15-17, 2019)

 

and

 

"(earthquakes at or near) 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying map by stippled white lines." (July 6-15, 2019)

 

The M 4.2 in Montenegro was the strongest within about 100 km of that epicenter since an M 4.4 on February 11, 2018 while the last such event in this range of the M 4.2 in Bosnia and Herzegovina was an M 4.2 on January 28, 2014. Forecast 117425 had expected today's activity was likely around July 17.

 

NEIC reported the earthquake of M 4.2 in Montenegro was felt with intensity II-III in the area(s) of Cajnice, Bosnia and Herzegovina.

 

O: 21JUL2019 09:07:52  43.5N   19.0E mb=4.2  EMSC   MONTENEGRO                   

P: 19JUL2019 117425    42.0N   19.0E 3.0-4.9 ABAAA  Adriatic Sea               

 

NEIC reported the earthquake of M 4.2 in  Bosnia and Herzegovina was felt with intensity V in Srebenik and Donja Orahovica, Bosnia and Herzegovina and IV in Barice, Stjepan, Mionica, and Tuzla, Bosnia and Herzegovina.

 

O: 21JUL2019 07:05:29  44.7N   18.5E mb=4.2  EMSC   BOSNIA AND HERZEGOVINA       

P: 19JUL2019 117425    42.0N   19.0E 3.0-4.9 ACAAA  Adriatic Sea               

 

The activity in the Adriatic Sea was joined by an M 4.5 in the Ionian Sea of Greece. This is the strongest quake in the Ionian Sea within about 100 km of this epicenter since an M4.9 on February 28, 2019. Forecast 117413 had expected today's activity within about 50 km around July 16.

 

O: 21JUL2019 14:53:08  37.7N   20.3E mb=4.5  EMSC   IONIAN SEA                   

P: 16JUL2019 117413    38.0N   20.0E 3.0-4.4 BAAAA  No. Greece                 

 

A moderate earthquake near Christchurch. Canterbury, South Island, New Zealand of M 3.4-4.3 continued seismicity which began in the area yesterday. GEONET reported this earthquake was felt with moderate intensity in the area of northern South Island, New Zealand. 5168 people reported feeling this earthquake including 1046 with weak intensity; 2873 with light intensity; 1153 with moderate shaking 87 with strong; 4 with severe and  5 with extreme intensity. There were no immediate reports of damage or casualties. NEIC reported this earthquake of M 3.4-4.3 in Christchurch, New Zealand was felt with intensity II-III in the area(s) of Christchurch, New Zealand. In the previous issue of this summary this had been discussed as:

 

"GEONET reported the M 3.3-3.8 earthquake near Christchurch was felt with moderate intensity in the area of northern South Island, New Zealand. 4777 people reported feeling this earthquake including 1621 with weak intensity; 2674 with light intensity; 446 with moderate shaking 23 with strong; 2 with severe and  11 with extreme intensity. There were no immediate reports of damage or casualties. NEIC reported this earthquake of M 3.3 in South Island, New Zealand was felt with intensity II-III in the area(s) of Christchurch, Lyttelton and Taitapu, Canterbury, New Zealand. This is the first earthquake to be widely felt in Christchurch since an M 4.2 on March 10, 2017. Forecast 117489 had expected activity in this area around July 20. It is located at 102 degrees from the M 7.1 in Central California of July 6 and the M 8.0 in Peru of May 26 and was probably promoted by seismic energy from those events." (July 20-21, 2019)

 

O: 21JUL2019 20:43:21  43.6S  172.6E ML=3.4  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 21JUL2018 20:43:22  43.6S  172.6E MS=4.3  GEONET Felt with moderate intensity

P: 20JUL2019 117489    44.0S  169.0E 3.0-5.0 AACAA  So. Island, N.Z.           

 

Three moderate earthquakes hit the region of Guam today. This continues activity in the area as noted in previous issues of this summary:

 

"The strongest earthquake in the world today was an M 5.6 in Guam. NEIC reported it was felt with intensity II in Guam. This is the strongest earthquake in the region of Guam in nearly a year - since an M 5.8 on September 23, 2018. With the approaching typhoon season, seismicity in this area is expected to increase in coming days. Forecast 117128 had expected today's event was likely in early July within about 50 km of this epicenter." (July 17, 2019)

 

NEIC reported today's earthquake of M 4.9 in Guam was felt with intensity II-III in the area(s) of Tamuning, Guam.

The M 5.5 and 5.2 were felt with intensity III in Guam at Mangilao and Tamuning.

 

O: 22JUL2019 04:52:35  12.3N  144.3E mb=4.9  EMSC   GUAM REGION                  

O: 21JUL2019 17:25:18  12.3N  144.3E mb=5.2  EMSC   GUAM REGION                   

O: 21JUL2019 17:35:33  12.3N  144.4E mb=5.5  EMSC   GUAM REGION                  

P:  7JUL2019 117128    13.0N  144.0E 4.0-5.4 DAAAA  So. Marianas/Guam          

 

MODERATE QUAKE IN NEW BRITAIN; UNUSUAL QUAKE IN CHRISTCHURCH, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR JULY 20, 2019

 

The largest earthquake in the world today was an M 5.6 in the region of New Britain, Indonesia. But a small, but widely felt earthquake also shook the region of Christchurch, Canterbury, South Island, New Zealand. Otherwise, the quiet period in global seismicity continued today. California was showing continued migration of small events out of the Ridgecrest area and into other active regions of the state.

 

GEONET reported the M 3.3-3.8 earthquake near Christchurch was felt with moderate intensity in the area of northern South Island, New Zealand. 4777 people reported feeling this earthquake including 1621 with weak intensity; 2674 with light intensity; 446 with moderate shaking 23 with strong; 2 with severe and  11 with extreme intensity. There were no immediate reports of damage or casualties. NEIC reported this earthquake of M 3.3 in South Island, New Zealand was felt with intensity II-III in the area(s) of Christchurch, Lyttelton and Taitapu, Canterbury, New Zealand.  This is the first earthquake to be widely felt in Christchurch since ian M 4.2 on March 10, 2017. Forecast 117489 had expected activity in this area around July 20. It is located at 102 degrees from the M 7.1 in Central California of July 6 and the M 8.0 in Peru of May 26 and was probably promoted by seismic energy from those events.

 

O: 20JUL2019 11:51:42  43.6S  172.7E ML=3.3  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 20JUL2018 11:51:42  43.6S  172.6E MS=3.8  GEONET Felt with moderate intensity

P: 20JUL2019 117489    44.0S  169.0E 3.0-5.0 AABAA  So. Island, N.Z.           

 

The largest earthquake of the day - the M 5.6 in New Britain was felt with intensity IV in the area(s) of Port Moresby, Papua New Guinea. A strong M 6.2 hit this epicenter on July 15, 2019 and this is probably an aftershock of that event. Forecast 117083 had expected regional activity in early to mid-July.

 

O: 20JUL2019 20:43:44   6.0S  149.5E mb=5.6  EMSC   NEW BRITAIN REGION, P.N.G.   

P:  7JUL2019 117083     5.0S  152.0E 4.0-5.5 DBBAA  New Britain                

 

MODERATE QUAKE FELT WIDELY IN GREECE

 

EARTHQUAKE SUMMARY FOR JULY 19, 2019

 

 

The most widely felt earthquake today was an M 5.3 in Greece. The mainshock was reported by NEIC to have been felt with moderate to strong intensity IV in Attiki, Greece at Magoula, Eleusis, Skaramankas, Dafni, and Khaidarion; V in Aspropirgos, Oinoi, and Petroupoli and IV in Ayia, Salamis, Greece. Aftershocks of M 4.2, were felt with intensity V in Attiki, area of Greece. The last earthquake with M>=5.3 within about 150 km of this epicenter in Greece was an M 5.5 on June 25, 2018 and prior to that an M 5.3 on February 15, 2016. The last within about 100 km of this epicenter was an M 5.4 on November 17, 2014. Forecast 117395 had expected today's event within about 100 km was likely around July 21. Previous issues of this summary had noted Greece as an area of enhanced seismicity at this time as:

 

 

"The full moon will arrive at 21:38 UT on July 16. Longitudes which are sub-solar at this time include areas of eastern Alaska, Canada and the NW U.S. Longitudes which are sub-lunar (antisolar) at this hour include areas of Greece and Turkey near 35-40 East longitude. These areas are likely to see enhanced seismicity at this time from tidal triggering." (July 15-17, 2019)

 

and

 

"(earthquakes at or near) 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying map by stippled white lines." (July 6-15, 2019)

 

The epicenter in Greece is at about 100 degrees from the mainshocks in California and was probably promoted from this source. It is also at this distance from the strong earthquakes in Banda of July 14; Peru (M 8.0 May 26) and Ecuador (Feb. 22 M 7.5) and may have been promoted from these areas as well.

 

O: 19JUL2019 11:13:14  38.1N   23.5E Mw=5.3  EMSC   GREECE                       

O: 19JUL2019 12:11:53  38.1N   23.6E ML=4.2  EMSC   GREECE                       

P: 21JUL2019 117395    38.0N   25.0E 3.0-4.4 AAAAA  Aegean Sea                 

 

The strongest earthquakes in the world today were an M 5.7 and 5.4 in the region of Arunachal Pradesh, India. NEIC reported intensity V in Arunachal Pradesh at Ziro and Golaghat; IV in Itanagar, Tezpur, Trashigang and Gauhati and III in Raha, Jorhat, Sibsagar and Amgun, Assam, India. An M 4.9 aftershock was felt with intensity IV in Arunachal Pradesh, India at Itanagar and Assam a Jorhat, North Gutahati and III in Bondila, Ziro, Nagaon, Gauhati, Disur, Diburgarh and Saulkuchi, Assam, India. The last earthquake within about 200 km of this epicenter with M>=5.7 was an M 5.9 on April 23, 2019 and prior to that an M 6.1 ten years ago on September 21, 2009. Like the earthquake in Greece this epicenter is in the 100-110 degree range from the M 7.1 in Central California of July 6. It is also at 103 degrees from the Kermadec swarm of June 15, 2019 and may have been promoted from these sources. 

 

O: 19JUL2019 09:52:01  27.7N   92.8E mb=4.7  EMSC   ARUNACHAL PRADESH, INDIA     

O: 19JUL2019 22:54:24  27.7N   92.8E mb=5.4  EMSC   ARUNACHAL PRADESH, INDIA     

O: 19JUL2019 09:22:14  27.7N   92.8E mb=5.7  EMSC   ARUNACHAL PRADESH, INDIA     

 

LULL IN GLOBAL SEISMICIT?Y

 

EARTHQUAKE SUMMARY FOR JULY 18, 2019

 

Seismicity throughout most of the world today was at low to quiet levels. The largest earthquakes were in the Indonesia-Philippines area where an M 5.3 occurred in the Molucca Sea aftershocks zone and events of M 4.9 and 4.8  shook Mindanao, Philippines. This quiet may be related to the loss of seismic promoters including the lack of ocean storms, geomagnetic storms and the end of the full moon period. The activity in Mindanao occurred at 104-105 degrees from the M 7.1 in Central California of July 6 and was probably promoted from that source. Forecast 117378 had expected this activity was likely around July 15.  NEIC reported these earthquakes of M 4.8 and 4.9 in Northern Mindanao, Philippines were felt with intensity II-III in the area(s) of Calaitan, Caraga, Philippines.

 

O: 18JUL2019 17:40:39   9.3N  125.9E mb=4.9  EMSC   MINDANAO, PHILIPPINES        

O: 18JUL2019 17:39:14   9.4N  125.9E mb=4.8  EMSC   MINDANAO, PHILIPPINES        

P: 15JUL2019 117378    11.0N  125.0E 3.5-5.0 BBAAA  Luzon, Philippines         

 

O: 19JUL2019 06:58:03   0.2N  126.4E mb=4.7  EMSC   MOLUCCA SEA                  

O: 18JUL2019 17:17:48   0.3N  126.3E Mw=5.3  EMSC   MOLUCCA SEA                  

O: 18JUL2019 17:08:21   0.3N  126.3E mb=4.8  EMSC   MOLUCCA SEA                  

O: 18JUL2019 09:55:06   0.4N  125.8E ML=4.0  EMSC   MOLUCCA SEA                  

O: 19JUL2019 04:43:50   1.0N  126.2E ML=4.5  EMSC   MOLUCCA SEA                  

P: 14JUL2019 117379     0.0N  126.0E 3.5-4.9 BAAAA  Molucca                    

 

An earthquake of M 4.9 also occurred deep beneath Bolivia today.  NEIC reported this earthquake of M 4.9 in Bolivia was felt with intensity II-III in the area(s) of Uyuni, Potosi, Bolivia.  CSN reported this earthquake was felt with intensity  III in  Tarapaca at Alto Hospicio and Iquique, Chile. The last earthquake of equal or greater magnitude in Bolivia was an M 5.4 on April 24, 2019. Forecast 117478 had expected activity in this area was likely around July 21.

 

O: 19JUL2019 01:18:23  20.9S   67.3W mb=4.9  EMSC   POTOSI, BOLIVIA              

O: 19JUL2019 01:18     20.8S   67.6W mb=4.9  GUC    Tarapaca atg Alto Hospicio and

P: 21JUL2019 117478    22.0S   69.0W 4.0-5.4 ABAAA  Coast No. Chile             

 

The largest earthquake in the western Hemisphere today was an M 5.0-5.1 in Chiapas, Mexico near the Guatemala border.  NEIC reported this earthquake of M 5.1 in Chiapas, Mexico was felt with intensity V in Malacan, Guatemala; IV in Tap;achula, Chiapas and San Felipe, Guatemala and II-III in the area(s) of Puerto Madero, Chiapas and in Guatemala at Quezaltenango, San Marcos, Suchitepequez and Solola. It is probably an aftershock of the M 6.6 in the area of February 1, 2019. The last aftershock of greater magnitude and the only since March, occurred June 22, 2019. Forecast 117375 had expected today's event was likely within about 100 km of this epicenter around July 21.

 

O: 19JUL2019 05:37:19  14.7N   92.4W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO      

O: 18JUL2019 16:24:24  14.8N   92.2W mb=5.0  EMSC   CHIAPAS, MEXICO              

O: 18JUL2019 16:24:24  14.8N   92.2W mb=5.1  ANSS   CHIAPAS, MEXICO              

P: 21JUL2019 117375    14.0N   92.0W 3.5-5.2 BAAAA  Guatemala                  

 

Seismicity in the U.S. and Canada was also at low levels today. There were no significant earthquakes located in the area today.

MODERATE EARTHQUAKE OFF COAST OF OREGON

 

EARTHQUAKE SUMMARY FOR JULY 17, 2019

 

 

The strongest earthquake in the U.S. or Canada today was an M 5.3-5.4 off the coast of Oregon. It was reported from the coast of Oregon at Coos Bay, North Bend, Florence, Reedsport, Brookings, Grants Pass, Corvallis, Salem, Central Point, and Medford, Oregon. This is the strongest earthquake within about 150 km of this epicenter since an  M 6.2 on August 22, 2018. Two events of M 5.3-5.4 hit the area on June 22, 2019. Forecast 117438 had expected today's event in this area was likely around July 14. This epicenter is located at 101 degrees from the M 7.3 in Halmahera and may be related to that event. This appears to be a continuation of the migration of sizable earthquakes to the northwest from Ridgecrest, California as noted in previous issues of this summary:

 

 

"An M 7.3 in the Halmahera Islands and Indonesia today may shift seismic patterns in coming days. The distance from the aftershock sequence in California is  106 degrees, too far from 103 degrees for major triggering in  that zone but is near 103 degrees from West-central and Northern California and Oregon north to Washington which could be affected by strongly concentrated seismic energy from this event." (July 15, 2019)

 

It was also promoted by the full moon as noted in the previous summary:

 

 

"The full moon will arrive at 21:38 UT on July 16. Longitudes which are sub-solar at this time include areas of eastern Alaska, Canada and the NW U.S. Longitudes which are sub-lunar (antisolar) at this hour include areas of Greece and Turkey near 35-40 East longitude. These areas are likely to see enhanced seismicity at this time from tidal triggering." (July 15-17, 2019)

 

Today's event occurred at 101 degrees from the M 7.3 in Halmahera and was probably promoted from that source by concentrated seismic energy.

 

O: 17JUL2019 15:00:00  43.5N  127.2W mb=5.3  EMSC   OFF COAST OF OREGON          

O: 17JUL2019 14:59:59  43.5N  127.2W mb=5.4  ANSS   OFF COAST OF OREGON          

P: 14JUL2019 117438    43.9N  128.4W 3.0-4.4 BAAAA  Off Coast of Oregon        

 

An aftershock in the Coso Junction region of central California of M 4.6 was also widely felt today. NEIC reported intensity II-III in California at Lone Pine, East Tulare County, Inyokern, Kernville, Ridgecrest, Springville, Lake Isabella, Weldon, Bodfish and Wofford Heights. This event is in the northern aftershock zone of the earthquakes of M 6.3 and 7.1 of July 4-6 near Ridgecrest. It is the strongest aftershock in this area since an M 5.4 about 40 km southeast of this on July 6. It is the strongest earthquake in the Coso Junction region since an M 4.7 on October 3, 2009 nearly 10 years ago. Forecast 117396 had expected this event within about 20 km of the epicenter was likely around July 17.

 

O: 18JUL2019 03:59:14  36.1N  117.9W Mw=4.6  EMSC   CENTRAL CALIFORNIA

P: 17JUL2019 117396    36.1N  118.1W 2.5-4.4 AAAAA  California/Nevada area     

 

A series of moderate earthquake with maximum M 5.3, 4.9 and 4.7 was felt with weak intensity in the Snares Island region of Southern South Island, New Zealand today. GEONET reported these events were felt with weak intensity by one person.

This activity is at 106-107 degrees from the M 7.1 in Central California of July 6 and may have been promoted from this source as noted in previous summaries:

 

"(earthquakes at or near) 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying ma by stippled white lines." (July 6-15, 2019)

 

The last earthquake recorded by GEONET in the Snares Island region with M>=5.3 was an M 5.8 on November 24, 2018 and prior to that an M 5.7 on October 13, 2014. Forecast 117489 had expected moderate seismicity in this area around July 14.

 

O: 17JUL2019 18:28:11  47.6S  165.5E ML=5.3  GEONET Felt with weak intensity by on

O: 17JUL2019 12:05:36  48.6S  164.9E ML=4.7  GEONET Felt with severe intensity by

O: 17JUL2019 11:57:12  48.6S  164.9E ML=4.9  GEONET Felt with severe intensity by

P: 14JUL2019 117489    45.0S  167.0E 3.0-4.9 BCBAA  So. Island, N.Z.           

 

MODERATE EARTHQUAKE SHAKES SAN FRANCISCO, CALIFORNIA

 

EARTHQUAKE SUMMARY FOR JULY 16, 2019

 

An earthquake of M 4.3 shook large portions of San Francisco, California today. It was followed by aftershocks of M 3.5 and 2.2 also felt in the region. NEIC reported maximum intensity IV in Livermore, Danville, Discovery Bay, San Ramon and in general within  about 50 km of the epicenter. Intensity II-III was felt within about 100 km of the epicenter. Nearly 11000 people reported feeling this event to NEIC.  The mainshock of M 4.3 occurred within a couple of minutes of local solar noon, a prime time when tidal stresses maximize. It occurred in conjunction of the full moon as described in previous issues of this summary in the tidal forecast for this full moon:

 

"The full moon will arrive at 21:38 UT on July 16. Longitudes which are sub-solar at this time include areas of eastern Alaska, Canada and the NW U.S. Longitudes which are sub-lunar (antisolar) at this hour include areas of Greece and Turkey near 35-40 East longitude. These areas are likely to see enhanced seismicity at this time from tidal triggering." (July 15-17, 2019)

 

The last earthquake of similar size in the San Francisco area occurred as an M 4.3-4.4 on January 4, 2018. It was also associated with a full moon as noted at the time in this summary:

 

"The full moon arrived on January 2, 2018 at 02:24 UT. This is a supermoon with the moon at its closest  point in its orbit. Tidal effects are likely to be about 30% larger than with a normal full moon." (January 1-4, 2018)

 

"An earthquake of M 4.4 hit the region of San Francisco early on January 4. This event occurred near local solar midnight and was probably promoted by high tidal stresses which maximize at this hour. NEIC reported it was felt with maximum intensity VI including IV at Emeryville, Oakland, Berkeley, Orinda, El Cerrito, Alameda, San Francisco, Richmond, Moraga, El Sobrante, Lafayette, and other communities within about 100 km of the epicenter. An aftershock of M 2.6 was reported felt with intensity II-III in Cupertino, Los Altos, Sunnyvale, San Jose, Mountain View, Saratoga, and other communities within about 50 km of the epicenter. An M 2.5 foreshock occurred within about an hour of local solar midnight and was reported felt with intensity II-III in Milpitas, Fremont, Pleasanton, San Jose, Sunnyvale and Hayward and within about 50 km of the epicenter. No major damages or casualties were associated with this moderate earthquake. At M 4.4 this is the strongest earthquake within about 100 km of this epicenter in San Francisco since an M 5.6 more than 11 years ago on October 31, 2007 and  prior to that an M 4.4 on February 25, 2001. Only one other earthquake of M>5 has occurred in this area in the past 25 years - an M 5.3 on January 16, 1993. This summary had placed the area under seismic watch three days ago and a number of indicators suggested this earthquake could happen at this time." (January 4-5, 2018)

 

This activity also follows an M 3.3 in Morgan Hill, California yesterday which was probably associated with the migration of regional seismicity in this region following the M 7.3 in Halmahera as noted in the previouos summary:

 

 

"An M 7.3 in the Halmahera Islands and Indonesia today may shift seismic patterns in coming days. The distance from the aftershock sequence in California is  106 degrees, too far from 103 degrees for major triggering in  that zone but is near 103 degrees from West-central and Northern California and Oregon north to Washington which could be affected by strongly concentrated seismic energy from this event." (July 15, 2019)

 

Today's epicenter is at 105 degrees from the Halmahera M 7.3 and was probably promoted by concentrated seismic energy from that source as previously described.

 

"The full moon arrived on January 2, 2018 at 02:24 UT. This is a supermoon with the moon at its closest  point in its orbit. Tidal effects are likely to be about 30% larger than with a normal full moon." (January 1-4, 2018)

 

O: 16JUL2019 20:24:16  37.8N  121.8W ML=3.5  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 16JUL2019 21:03:36  37.8N  121.8W Md=2.2  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 16JUL2019 20:11:01  37.8N  121.8W Mw=4.3  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 14JUL2019 117404    37.7N  121.9W 2.5-4.4 AAAAA  Central California         

 

The strongest earthquake in the world today was an M 5.6 in Guam. NEIC reported it was felt with intensity II in Guam. This is the strongest earthquake in the region of Guam in nearly a year - since an M 5.8 on September 23, 2018. With the approaching typhoon season, seismicity in this area is expected to increase in coming days. Forecast 117128 had expected today's event was likely in early July within about 50 km of this epicenter.

 

O: 16JUL2019 22:03:51  12.4N  144.5E Mw=5.6  EMSC   GUAM REGION                   

P:  7JUL2019 117128    13.0N  144.0E 4.0-5.4 CAAAA  So. Marianas/Guam          

 

A moderate M 4.5 also occurred in the Te Anau region of South Islands, New Zealand today.  GEONET reported 28 people felt this quake with 13 with weak intensity; 13 with light intensity and 2 with moderate intensity. None  reported strong shaking and 0 extreme intensity. The last events within about 150 km of this epicenter in South Island, New Zealand was an  M 4.6 on April 6, 2019 and prior to that an M 4.6 on March 15, 2017.  Forecast 117489 had expected today's event within about 50 km of the epicenter was likely around July 14. This epicenter is located at 104-105 degrees from  the M 7.1 in Central California of July 6 and from the M 8.0 in Peru of May 26, 2019. It was probably promoted by concentrated energy from those events as noted in previous summaries:

 

"(earthquakes at or near) 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying ma by stipled white lines." (July 6-15, 2019)

 

 

O: 16JUL2019 13:17:37  45.4S  167.2E ML=4.5  GEONET reported 28 people felt this q

P: 14JUL2019 117489    45.0S  167.0E 3.0-4.9 AAAAA  So. Island, N.Z.           

 

 

EASTERN/CENTRAL INDONESIA CONTINUES ACTIVE

 

EARTHQUAKE SUMMARY FOR JULY 15, 2019

 

The strongest seismicity in the world today continued in the active zones of Central and Eastern Indonesia. The largest of these was an M 6.2 in Papua New Guinea but an M 5.8 south of Bali was also widely felt. This continues a strong activation of the region following the M 7.1 in Central California aof July 6 and the geomagnetic storm noted in previous issues as:

 

"(earthquakes at or near) 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying ma by stipled white lines." (July 6-8, 10-13 2019)

 

and

 

"In the previous issue of this summary, it was noted that a high probability occurred for a moderate to strong quake in Papua, New Guinea which is at 103 degrees from Southern California. This area had an M 8.0 on January 10, 1971 a month before the M 6.7 San Fernando quake and is watched for precursory activity by this summary." (July 8, 10-13, 2019)

 

and

 

"This is the strongest disturbance in the geomagnetic field in a month - since it reached 18 on June 8. Some geomagnetic effects may enhance seismicity near the geomagnetic equator and at high latitudes with this active period." (July 11-13, 2019)

 

NEIC reported maximum intensity VI for the PNG quake at Kimbe and V in Kandrian, West New Britain, PNG and II in Port Moresby, Papua New Guinea. The last earthquake within about 150 km of the New Britain, PNG M 6.2 with M>=6.2 was an M 6.3 on March 5, 2017 and prior to that an M 6.9 on October 17, 2016. Forecast 117084 had expected today's event was likely in early July.

 

O: 15JUL2019 08:21:36   6.0S  149.5E Mw=6.2  EMSC   NEW BRITAIN REGION, P.N.G.   

P:  6JUL2019 117084     6.0S  148.0E 4.0-5.4 CCABA  New Ireland                

 

NEIC reported the event in Bali was strongly felt with intensity VIII in Srono, Java and IV in Java and Bali at Muncar, Negara, Kuta, Tabanan, Denpasar, Ubud and Klungkung, Indonesia. The earthquake in the Bali regoin of Indonesia of M 5.7 was the strongest within about 150 km of that epicenter since an  M 6.0 about 150 km north of this on October 10, 2018 and an M 5.7 about 150 km to the west on November 16, 2016. Forecast 117467 had expected this event was likely within about 50 km of the epicenter around July 15.

 

O: 16JUL2019 00:18:37   8.9S  114.5E Mw=5.7  EMSC   BALI REGION, INDONESIA       

P: 15JUL2019 117367     9.0S  114.0E 4.0-5.4 AAAAA  So. of Bali                

 

An earthquake of M 3.3 occurred in northern California south of San Francisco, California today. This earthquake near Morgan Hill, California was felt within about 50 km of the epicenter with intensity II-III according to data from NEIC. It was reported from San Jose, Coyote, Morgan Hill, Mount Hamilton, California among others. This is the first significant activity along the central to northern California coast since the major M 7.1 Ridgecrest earthquake of July 6. As this is at 104-105 degrees from Halmahera, it appears to confirm the migration of seismicity away from the Ridgecrest aftershock zone related to the M 7.3 in Halmahera yesterday as suggested in the previous issue of this summary:

 

 

"An M 7.3 in the Halmahera Islands and Indonesia today may shift seismic patterns in coming days. The distance from the aftershock sequence in California is 106 degrees, too far from 103 degrees for major triggering in  that zone but is near 103 degrees from West-central and Northern California and Oregon north to Washington which could be affected by strongly concentrated seismic energy from this event." (July 15, 2019)

 

Today's M 3.3 is the strongest in the San Francisco, California area since an M 3.3-3.4 on April 27, 2019 and January 15-17, 2019. The last event of significantly larger magnitude in the area was an M 3.8 on April 16, 2018. Forecasts 117404 had expected today's activity within about 50 km was likely around July 13-14.

 

O: 15JUL2019 20:46:50  37.3N  121.7W Mw=3.3  EMSC   NORTHERN CALIFORNIA          

P: 13JUL2019 117404    37.2N  122.1W 2.5-4.4 AAAAA  Central California         

P: 14JUL2019 117404    37.7N  121.9W 2.5-4.4 AAAAA  Central California          

 

An earthquake of M 3.1 also occurred in the Geysers of California today at about 103-104 degrees from Halmahera.

 

O: 15JUL2019 06:43:55  38.8N  122.9W Ml=3.1  EMSC   NORTHERN CALIFORNIA          

P: 16JUL2019 117405    38.9N  122.8W 2.5-4.4 AAAAA  Central California         

 

Two light earthquakes of M 3.4 and 3.7 occurred today in the region near Petit Rocher, New Brunswich,

Canada. They were reported felt in the epicentral area. This continues active conditions in southeastern Canada which began following the M 7.1 in California of July 6. The last event of M>=3.7 within about 100 km of these epicenters occurred as an M 3.7 on November 4, 2015 and prior to that an M 3.7 on January 5, 2005. Three  events of M 3.7-4.1 occurred during the 1990's. Forecast 117229 had expected today's activity was likely around July 9.

 

O: 15JUL2019 16:06:16  47.8N   66.0W MB=2.5  ECAN Petit Rocher, NB. Aftershock   

O: 15JUL2019 15:44:04  47.8N   65.9W MB=3.4  ECAN Petit Rocher, NB. Felt         

O: 15JUL2019 12:47:23  47.8N   65.9W MB=3.7  ECAN Petit Rocher, NB. Felt         

P:  9JUL2019 117229    49.3N   67.5W 2.0-4.3 CBAAA  Maine                      

 

MAJOR HALMAHERA EARTHQUAKE MAY SHIFT SEISMIC PATTERN

 

EARTHQUAKE SUMMARY FOR JULY 14, 2019

 

An M 7.3 in the Halmahera Islands and Indonesia today may shift seismic patterns in coming days. The distance from the aftershock sequence in California is 106 degrees, too far from 103 degrees for major triggering in  that zone but

is near 103 degrees from West-central and Northern California and Oregon north to Washington which could be affected by strongly concentrated seismic energy from this event. The earthquake in Halmahera is part of a regional activation which began following the M 7.1 in central California and has included earthquake of M 6.7 in Molucca and M 6.6 off north-western Australia, a unique event. This summary had expected regional enhancement from California in this area in previous issues as:

 

 

"(oarthquakes at or near) 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying ma by stipled white lines." (July 6-8, 10-13 2019)

 

 

"In the previous issue of this summary, it was noted that a high probability occurred for a moderate to strong quake in Papua, New Guinea which is at 103 degrees from Southern California. This area had an M 8.0 on January 10, 1971 a month before the M 6.7 San Fernando quake and is watched for precursory activity by this summary." (July 8, 10-13, 2019)

 

Today's event was followed by an energetic aftershock sequence but no additional strong earthquakes were reported. This may be related to the strong geomagnetic storm as noted in previous issues of this summary:

 

"This is the strongest disturbance in the geomagnetic field in a month - since it reached 18 on June 8. Some geomagnetic effects may enhance seismicity near the geomagnetic equator and at high latitudes with this active period." (July 11-13, 2019)

 

O: 14JUL2019 10:38:43   0.0S  127.7E ML=4.3  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 10:48:50   0.3S  127.7E ML=4.3  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 10:13:49   0.4S  127.9E mb=4.7  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 15:44:19   0.4S  128.0E mb=5.2  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 10:01:18   0.5S  127.7E ML=4.4  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 15:39:08   0.5S  127.8E ML=4.0  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 16:36:58   0.5S  127.8E ML=4.1  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 10:36:10   0.5S  127.8E mb=4.4  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 11:08:35   0.5S  127.8E mb=4.8  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 11:38:50   0.5S  127.9E ML=4.2  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 10:26:57   0.5S  127.9E Mw=5.7  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 13:44:13   0.5S  127.9E mb=4.5  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 10:54:05   0.5S  127.9E mb=4.8  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 11:52:30   0.5S  128.0E mb=5.0  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 10:05:20   0.5S  128.0E mb=5.3  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 09:10:50   0.5S  128.1E Mw=7.3  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 09:38:25   0.6S  127.6E ML=4.9  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 12:35:39   0.6S  127.6E mb=4.7  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 12:22:57   0.6S  127.6E mb=4.8  EMSC   HALMAHERA, INDONESIA

O: 15JUL2019 03:05:14   0.6S  127.7E mb=5.0  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 11:33:51   0.6S  127.8E ML=4.1  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 13:27:52   0.6S  127.8E ML=4.2  EMSC   HALMAHERA, INDONESIA

O: 15JUL2019 05:48:09   0.6S  127.9E ML=4.2  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 10:44:25   0.6S  127.9E mb=4.6  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 12:05:46   0.6S  128.0E ML=4.5  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 22:21:21   0.6S  128.0E ML=4.5  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 12:25:55   0.7S  127.6E ML=4.3  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 09:43:46   0.7S  127.7E mb=5.8  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 10:57:57   0.7S  127.8E mb=4.6  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 09:22:37   0.7S  128.2E mb=4.9  EMSC   HALMAHERA, INDONESIA

O: 15JUL2019 05:50:44   0.8S  127.8E mb=4.5  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 15:13:27   0.8S  128.1E ML=4.1  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 16:57:39   0.8S  128.1E ML=4.2  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 22:29:35   0.8S  128.2E ML=4.5  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 09:35:11   0.8S  128.2E mb=4.5  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 09:29:36   0.8S  128.2E mb=5.2  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 18:16:03   0.8S  128.3E ML=4.2  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 09:28:39   0.8S  128.3E mb=5.2  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 10:23:36   0.8S  128.4E mb=4.5  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 13:56:10   0.8S  128.4E mb=4.5  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 18:42:25   0.9S  127.7E ML=4.0  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 11:37:47   0.9S  128.2E ML=4.1  EMSC   HALMAHERA, INDONESIA

O: 14JUL2019 09:54:48   0.9S  128.5E mb=5.0  EMSC   HALMAHERA, INDONESIA         

P: 14JUL2019 117379     0.0N  126.0E 3.5-4.9 AABAA  Molucca                    

 

The enhanced seismicity in the region of Greece and the Anatolian Fault also continued today. This was probably spurred by the M 7.3 in Halmahera which is at 103 degrees from Greece when an M 4.9 occurred.  NEIC reported this earthquake of M 4.9 in Greece was felt with intensity IV in Kozani and Siatista; IV in Tetovo and I-III in the area(s) of Larisa, Bitola and Ohrid, Greece. Today's epicenter is about 100 km southeast of a series of  events of M 4.9-5.1 on June 1, 2019. Earthquakes at about 100 km from today's epicenter in recent years included an M 5.1 on August 31, 2019 and an M 5.0 on September 11, 2017.  Forecast 117442 had expected today's event within about 100 km was likely around July 14. Tidal stresses are strong in this area at this time and could encourage further activity in coming days as noted in this summary:

 

"The full moon will arrive at 21:38 UT on July 16. Longitudes which are sub-solar at this time include areas of eastern Alaska, Canada and the NW U.S. Longitudes which are sub-lunar (antisolar) at this hour include areas of Greece and Turkey near 35-40 East longitude. These areas are likely to see enhanced seismicity at this time from tidal triggering. Other regions can also be subject to tidal triggering at the full moon including areas of western South America. A strong earthquake is likely during the period July 15-20 probably enhanced by tidal stresses." (July 13-14, 2019)

 

O: 14JUL2019 10:50:13  40.2N   21.8E mb=4.9  EMSC   GREECE                       

P: 14JUL2019 117442    41.0N   21.0E 3.0-5.0 AAAAA  Romania/NW Turkey          

 

Strong seismicity continued in the aftershock zone off northwestern Australia. The largest of these was an M 5.5. NEIC reported this aftershock of M 5.5 in Western Australia was felt with intensity II-III in the area(s) of Western Australia at Broome, Port Hedland, Karratha and Perth. The mainshock was described in the previous issue of this summary as:

 

 

"A strong M 6.6 earthquake was located off the coast of western Australia today. NEIC reported it was felt with maximum intensity V in Broome, and IV in Port Hedland. Karratha and Darwin, Western Australia and within about 1500 km of the epicenter. This is an area where strong tropical cyclones often make landfall in Australia. This summary has previously linked these events to increased antipodal seismicity in the northern Caribbean. Today's event is antipodal to the Virgin Islands and Puerto Rico. In the past issue of this summary it had been noted in this regard:

 

"The lull period in the northern Caribbean commented on in this summary also appeared to dissipate. The hurricane season often brings enhanced seismicity to this region, and it's antipode north of Australia and south of Sumbawa." (July 12-13, 2019)

 

No earthquakes of M>=6.5 have been recorded within about 400 km of this epicenter in at least 30 years. The last moderate quake in the area was an M 4.9 on May 10, 2016 and prior to that an M 5.1 on March 6, 2009. While activity in the Flores and Sumbawa area had been expected at this time, the low seismicity in this region prevented a forecast for this event.

This was expected south of Indonesia in forecast 117319 in mid-July. In the previous issue of this summary it had been noted:

 

"Seismicity was also up in the region of central Indonesia with a series of events up to M 5.1 in the Sumbawa and Flores area." (July 12-13, 2019)" (July 13-14, 2019)

 

 

O: 14JUL2019 21:49:26  18.1S  120.1E ML=3.4  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 13:35:08  18.1S  120.1E ML=3.8  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 16:47:33  18.1S  120.3E ML=3.7  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 13:10:44  18.2S  120.3E ML=3.5  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 16:23:47  18.2S  120.3E ML=3.6  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 10:07:17  18.2S  120.3E ML=4.1  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 15:58:32  18.2S  120.4E mb=4.5  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 07:26:37  18.2S  120.4E mb=5.0  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 11:05:22  18.3S  120.1E ML=3.6  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 18:26:55  18.3S  120.2E ML=3.4  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 14:14:12  18.3S  120.2E ML=3.6  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 17:25:52  18.3S  120.2E ML=3.8  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 08:37:35  18.3S  120.2E ML=4.1  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 19:45:24  18.3S  120.3E ML=3.2  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 19:55:00  18.3S  120.3E ML=3.8  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 22:13:42  18.3S  120.4E ML=3.2  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 18:48:46  18.3S  120.5E ML=3.3  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 11:18:15  18.4S  120.2E ML=3.7  EMSC   WESTERN AUSTRALIA

O: 15JUL2019 02:53:33  18.4S  120.3E ML=3.6  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 23:01:35  18.4S  120.3E mb=5.5  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 10:58:00  18.4S  120.5E mb=4.5  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 18:54:17  18.5S  120.4E ML=3.5  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 20:25:56  18.5S  120.6E ML=3.1  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 06:41:07  18.5S  120.6E ML=4.0  EMSC   WESTERN AUSTRALIA

O: 15JUL2019 05:49:50  18.6S  120.1E ML=3.9  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 20:41:38  18.6S  120.4E ML=3.1  EMSC   WESTERN AUSTRALIA

O: 14JUL2019 08:57:55  18.6S  120.4E ML=3.8  EMSC   WESTERN AUSTRALIA

O: 15JUL2019 00:36:33  18.6S  120.5E ML=3.9  EMSC   WESTERN AUSTRALIA

O: 15JUL2019 05:28:04  18.7S  120.3E ML=4.1  EMSC   WESTERN AUSTRALIA

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in the Alaska Peninsula. It was not reported felt in this remote area. The last event within  about 150 km of this epicenter in the Alaska Peninsula with M>=4 was an M 4.0 on June 10, 2019 and prior to that an M 5.0 on October 10, 2018. Forecast 117262 had expected activity in this area was likely in early July.

 

O: 14JUL2019 13:40:07  56.6N  157.6W ml=4.0  EMSC   ALASKA PENINSULA             

P:  7JUL2019 117262    55.8N  158.7W 3.5-5.1 CAAAA  Alaska Peninsula           

 

STRONG EARTHQUAKE HITS OFF WESTERN AUSTRALIA

 

EARTHQUAKE SUMMARY FOR JULY 13, 2019

 

A strong M 6.6 earthquake was located off the coast of western Australia today. NEIC reported it was felt with maximum intensity V in Broome, and IV in Port Hedland. Karratha and Darwin, Western Australia and within about 1500 km of the epicenter. This is an area where strong tropical cyclones often make landfall in Australia. This summary has previously linked these events to increased antipodal seismicity in the northern Caribbean. Today's event is antipodal to the Virgin Islands and Puerto Rico. In the past issue of this summary it had been noted in this regard:

 

"The lull period in the northern Caribbean commented on in this summary also appeared to dissipate. The hurricane season often brings enhanced seismicity to this region, and it's antipode north of Australia and south of Sumbawa." (July 12-13, 2019)

 

No earthquakes of M>=6.5 have been recorded within about 400 km of this epicenter in at least 30 years. The last moderate quake in the area was an M 4.9 on May 10, 2016 and prior to that an M 5.1 on March 6, 2009. While activity in the Flores and Sumbawa area had been expected at this time, the low seismicity in this region prevented a forecast for this event.

This was expected south of Indonesia in forecast 117319 in mid-July. In the previous issue of this summary it had been noted:

 

"Seismicity was also up in the region of central Indonesia with a series of events up to M 5.1 in the Sumbawa and Flores area." (July 12-13, 2019)

 

O: 14JUL2019 05:39:24  18.1S  120.4E Mw=6.7  EMSC   WESTERN AUSTRALIA            

O: 14JUL2019 06:35:24  18.4S  120.3E ML=4.1  EMSC   WESTERN AUSTRALIA            

O: 14JUL2019 06:41:07  18.5S  120.6E ML=4.0  EMSC   WESTERN AUSTRALIA             

P:  8JUL2019 117319    11.0S  118.0E 4.0-5.5 CAAAA  South of Indonesia         

 

An unusually large M 5.6 also occurred in the Southern East Pacific Rise today. This area became active with an M 5.2 south of this following the M 7.1 in California if July 6. This event was not felt in this remote area. It is the strongest earthquake within about 350 km of the epicenter since an M 5.8 on May 12, 2014, an aftershock of an M 6.5 on the same date. Forecast 117353 had expected this event was likely around July 7.

 

O: 13JUL2019 07:59:36  49.5S  116.8W Mw=5.6  EMSC   SOUTHERN EAST PACIFIC RISE   

P:  7JUL2019 117353    50.0S  116.0W 4.0-5.5 CAAAA  East Pacific Rise          

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in western Montana. This, and an M 4.0 aftershock was widely felt in Montana. NEIC reported intensity  IV in Montana at Three Forks and Manhattan and II-III within about 100 km in Montana at Belgrade, Bozeman, Radersburg, Toston, Cardwell, Gallatin Gateway and Townsend. The last earthquake within about 100 km of this epicenter with M>=4.5 occurred more than 30 years ago. The only regional event within about 200 km of larger magnitude in this time was an M 5.8 of July 6, 2017. Forecasts 117432 and 117447 had expected activity in this region was likely between July 14 and 21.

 

O: 14JUL2019 01:52:46  45.9N  111.4W Ml=4.5  EMSC   WESTERN MONTANA              

P: 14JUL2019 117432    45.4N  112.7W 2.0-3.9 AAAAA  Montana/Idaho              

P: 21JUL2019 117447    46.4N  111.4W 2.0-3.9 CAAAA  Yellowstone/Wyoming        

 

The most unusual earthquake in the U.S. or Canada today was an M 3.7 in Southern Quebec near the New York border. It was felt lightly in the epicentral area according to Earthquakes Canada. This is the strongest earthquake within about 150 km of this epicenter in nearly 12 years - since an M 4.1 on October 1, 2007. Forecast 117237 had expected this event within about 50 km was likely in early July.

 

O: 13JUL2019 17:56:45  47.2N   76.4W mb=3.7  EMSC   SOUTHERN QUEBEC, CANADA      

P:  5JUL2019 117237    47.0N   76.0W 2.0-3.9 CAAAA  New York State             

 

Two unusual earthquakes also occurred today in Europe - an M 4.7 in Greece and an M 5.0 west of this and southwest of Sicily, Italy in the western Mediterranian.  These appear to be related to the activation of the Anatolian Fault zone following the M 7.1 in California of July 6 as noted in previous issues of this summary:

 

 

"Energy on the surface from California does not have a good angle with the east-west orientation of the North Anatolian Fault though, so a major quake in this  area, while it could happen, is unlikely to have been triggered from California. Still, the conditions may be ripe for a moderate quake in northern Turkey or Greece at this time. Both areas respond to geomagnetic storms." (July 10, 2019)

 

 

The earthquake in the western Mediterranean of M 5.0 is the strongest within about 250 km of that epicenter since an M 5.1 on January 2, 2018 and prior to that an M 5.2 on May 28, 2016. The last such event within about 100 km of this epicenter was an M 5.5 on May 19, 2013. NEIC reported it was felt with intensity V in Algeria at Oued and Jijili; IV in Amir, and II-III within about 100 km of the epicenter.  Forecast 117213 and 117424 had expected this activity was likely around July 9-15. This earthquake occurred at the 4th node (90 degrees) from California and may have been promoted from that source. The event in Greece was near 100 degrees from California and was also probably promoted.

 

O: 13JUL2019 09:56:36  37.2N    5.7E Mw=5.0  EMSC   WESTERN MEDITERRANEAN SEA    

O: 13JUL2019 13:38:26  37.7N    5.1E mb=4.0  EMSC   WESTERN MEDITERRANEAN SEA    

P:  9JUL2019 117213    37.0N    5.0E 3.0-4.8 BAAAA  Western Mediterranean      

P: 15JUL2019 117424    37.0N    4.0E 3.0-4.6 AAAAA  Western Mediterranean      

 

NEIC reported the M 4.7 in Greece was felt with intensity V in Greece at Paravola; IV in Neapoli and II-III in Palairos, Agrinion, Leukas, Nidnon, Vasiliki, Greece.

 

O: 13JUL2019 15:08:42  38.8N   21.2E ML=4.7  EMSC   GREECE                       

P:  7JUL2019 117177    39.0N   21.0E 3.0-4.8 CAAAA  No. Greece                 

P: 16JUL2019 117413    38.0N   20.0E 3.0-4.4 BAAAA  No. Greece                 

 

MODERATE QUAKES SHAKE WASHINGTON AND CENTRAL CALIFORNIA

 

EARTHQUAKE SUMMARY FOR JULY 12, 2019

 

Moderate earthquakes of M 4.5-4.6 (Washington) and M 4.9 (Central California) were widely felt today. NEIC reported maximum intensity IV in the Seattle area at Snohomish, Monroe, Everett, and Woodinville and lesser intensity within about  150 km of the epicenter.  The increases in seismicity in the western U.S. today may have been promoted from several sources. The primary of these was the landfall of Hurricane Barry on the Louisiana coast about the time these events occurred. But a strong geomagnetic storm, the strongest in more than a month, was also active at the time the events hit Washington and the Ridgecrest aftershock zone in California. As noted in previous issues of this summary there is a  connection between moderate to strong quakes in Central California and those to the north in Washington and Oregon. This was exemplified by the strong swarm in Central California of large quakes from May 24, 1980 in Mammoth Lakes several days following the Mt. St. Helens eruption of May 18, 1980. In the  current situation minor swarms have recently occurred in the Mt. Hood region and other volcanic centers in Washington and Oregon which may have been precursory to today's events in Puget Sound, Washington.

 

The M 4.4-4.6 was followed by an M 3.5 aftershock. The last earthquake in the Puget Sound region with equal or greater mangitude was an M 4.9 on December 30, 2015. The last within about 100 km was an M 4.5-4.6 on January 30, 2009 more than 10 years ago. Forecasts 117258, 117446 and 117257 had expected this activity was likely between July 7 and 13.

 

O: 12JUL2019 09:51:36  48.0N  122.0W mb=4.4  EMSC   PUGET SOUND REGION, WASHINGTON

O: 12JUL2019 09:51:38  47.9N  122.0W ml=4.6  ANSS   Three Lakes Washington       

P:  9JUL2019 117257    46.9N  122.0W 2.0-4.1 AAAAA  Washington state, U.S.     

P:  8JUL2019 117258    48.9N  123.1W 2.0-4.1 BAAAA  Washington state, U.S.     

P: 13JUL2019 117446    48.9N  123.1W 2.0-3.9 AAAAA  Washington state, U.S.     

 

O: 12JUL2019 09:53:58  47.9N  122.0W ML=3.5  EMSC   SEATTLE-TACOMA AREA, WASHINGTO

P:  7JUL2019 117257    47.5N  121.8W 2.0-3.9 BAAAA  Washington state, U.S.     

 

An earthquake of M 4.9 also occurred today in the aftershock zone near Ridgecrest, California where it was widely felt. NEIC reported it was felt with intensity IV in Ridgecrest, Trona and Inyokern and lesser II-III within about 100 km of the epicenter. This is the strongest aftershock in the region of the M 7.1 since July 6 when other events of M 4.9 and 5.4 followed the mainshock. Forecast 117397 had expected today's event within about 25 km of the epicenter was likely around  July 13. A listing of earthquakes in the area today of M>=2.5 is located under the "CALIFORNIA" section of this summary.

 

O: 12JUL2019 13:11:37  35.6N  117.6W mw=4.9  ANSS   8km ENE of Ridgecrest        

P: 13JUL2019 117397    35.8N  117.5W 2.5-4.4 AAAAA  California/Nevada area     

 

A strong M 5.8 occurred in northern Philippines today in the region of Mindanao.NEIC reported it was felt with IV in Caraga, Philippines at Purok, Libas, Butuan and Barra, Tubay and Los Angeles, Philippines and with lesser intensity at Brasilisa, Davao and Lagonglong, Mindanao, Philippines. This epicenter is at 104-105 degrees from the M 7.1 in California of July 6 and was probably promoted by concentrated energy from that source. It may also have been

promoted by the geomagnetic storm in progress. The geomagnetic equator passes within about 6 degrees of this epicenter. It is the strongest event within  about 100 km of this epicenter since an M 6.0 on March 8, 2019 and an M 5.9 on February 8, 2019. Forecast 117112 had expected today's event was likely around July 9 and due to the distance from California had been noted in previous issues of this summary as:

 

"(Expected Far-field aftershocks) include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying ma by stipled white lines." (July 6, 8, 2019)

 

Moderate quakes were also located in New Britain and Greece today at 100-103 degrees from California.

 

O: 12JUL2019 20:42:55   9.3N  126.0E mw=5.8  ANSS   ESE of Cantilan Philippines  

P:  9JUL2019 117112    10.0N  127.0E 3.5-5.0 BAAAA  Luzon, Philippines         

 

The strongest earthquake in the world today was an M 6.1 in the area northwest of the Ryukyu Islands, Japan. NEIC reported it was felt with moderate intensity in Okinawa, Ryukyu Islands, Japan. This is the strongest earthquake within about 150 km of this epicenter in the

Ryukyu Islands since an M 6.7 on November 13, 2015 and the second largest at intermediate or deep focus in the past 30 years since an M 6.2 on October 3, 2008. Forecast 117173 had expected today's event was likely around July 9.

 

O: 13JUL2019 00:57:42  29.5N  128.0E Mw=6.1  EMSC   NORTHWEST OF RYUKYU ISLANDS

P:  9JUL2019 117144    29.0N  129.0E 4.0-5.6 BAAAA  Ryukyu Islands             

P:  9JUL2019 117173    30.0N  129.0E 3.5-5.0 BAAAA  Kyushu, Japan area         

 

Two moderate M 4.5 earthquakes occurred today off the coast of Guatemala. These may have been promoted by unloading of atmospheric pressure north of this

due to landfall of Hurricane Barry on the Gulf Coast. This summary had anticipated this as:

 

"This system has low pressures north of the Central America subduction zone and could enhance seismicity in eastern Mexico, Guatemala and areas to the south in the next several days." (July 12-13, 2019)

 

O: 13JUL2019 01:40:23  13.6N   91.0W mb=4.5  EMSC   OFFSHORE GUATEMALA           

O: 13JUL2019 01:36:11  13.7N   90.9W mb=4.5  EMSC   OFFSHORE GUATEMALA           

P:  8JUL2019 117107    15.0N   91.0W 3.5-5.4 BBAAA  Guatemala                  

 

Seismicity was also up in the region of central Indonesia with a series of events up to M 5.1 in the Sumbawa and Flores area.  NEIC reported this activity was felt in the Sumbawa and Bali areas of Indonesia with maximum intensity IV in Kuta, Bali and II-III in Bali at Denpasar, Ubud, Mataram and Karangasem. The antipode of this is in northern Venezuela. Antpodal earthquakes in these two areas are not uncommon especially at times of high geomagnetic disturbance as is currently the case. The lull period in the northern Caribbean commented on in this summary also appeared to dissipate. The hurricane season often brings enhanced seismicity to this region, and it's antipode north of Australia and south of Sumbawa. The earthquake in Venezuela was reported felt with intensity II in Maracaibo, Venezuela.

 

O: 12JUL2019 17:01:57   8.9S  117.9E Mw=5.1  EMSC   SUMBAWA REGION, INDONESIA    

O: 12JUL2019 18:45:45   9.0S  117.9E ML=4.0  EMSC   SUMBAWA REGION, INDONESIA    

O: 12JUL2019 21:56:27   9.0S  117.9E ML=4.4  EMSC   SUMBAWA REGION, INDONESIA    

O: 12JUL2019 19:15:29   9.1S  117.9E ML=4.5  EMSC   SUMBAWA REGION, INDONESIA    

P:  8JUL2019 117319    11.0S  118.0E 4.0-5.5 BBAAA  So. of Indonesia           

 

O: 13JUL2019 02:38:59  10.1N   72.9W mb=4.6  EMSC   ZULIA, VENEZUELA             

P:  8JUL2019 117122    12.0N   71.0W 3.5-5.3 BBBAA  Northern Venezuela         

STRONG M 6.0 HITS NEW GUINEA

 

EARTHQUAKE SUMMARY FOR JULY 11, 2019

 

The strongest earthquake in the world today was an M 6.0 in the Bougainville region of Papua New Guinea. The last earthquake of M>=6 within about 200 km of this epicenter was an M 6.0 on May 17, 2019 with the last of larger magnitude of M 6.8 on May 17, 2018 which occurrred about 200 km to the west of today's epicenter.  These are probably aftershocks of a great M 7.9 event of January 22, 2017.  Forecasts 117083 had expected this activity was likely around July 7.

 

O: 11JUL2019 17:08:39   4.7S  155.2E Mw=6.0  EMSC   BOUGAINVILLE REGION, P.N.G.  

P:  7JUL2019 117083     5.0S  152.0E 4.0-5.5 BACAA  New Britain                

P:  7JUL2019 117083     7.0S  154.0E 4.0-5.4 BCAAA  New Britain                 

 

Three earthquakes of M>=4 occurred in the Ridgecrest-Coso Junction region of California today and were felt with moderate intensity in the aftershock zone. These included an M 4.3 and 4.1. A listing of events in the region today of M>=2.5 is located under the "CALIFORNIA" section of this summary. Forecast 117152 had expected today's activity was likely around July 9.

 

O: 11JUL2019 23:45:18  36.0N  117.7W Mw=4.1  EMSC   CENTRAL CALIFORNIA

O: 11JUL2019 07:04:05  36.2N  117.9W Mw=4.0  EMSC   CENTRAL CALIFORNIA

O: 11JUL2019 04:10:01  36.1N  117.9W Mw=4.3  EMSC   CENTRAL CALIFORNIA           

P:  9JUL2019 117152    36.1N  118.1W 2.5-4.5 AAAAA  California/Nevada area     

P:  9JUL2019 117153    36.8N  117.5W 2.5-4.4 AAAAA  California/Nevada area     

 

CRETE SHAKES TO MODERATE QUAKE

 

EARTHQUAKE SUMMARY FOR JULY 10, 2019

 

The most widely felt earthquake in the world today was an M 4.5-4.8 in Crete, Greece. NEIC reported this earthquake of M 4.8 in Crete, Greece was felt with intensity II-III in the area(s) of Greece at Yerani Hania and Rethiminon, Greece.

This event is near the Anatolian Fault Zone at 102 degree from the earthquake of M 7.1 in California of July 5 and from Peru (M 8.0, May 26) and Ecuador (M 7.3, February 22) and may represent triggering from those events as previously proposed in this summary:

 

"Energy on the surface from California does not have a good angle with the east-west orientation of the North Anatolian Fault though, so a major quake in this  area, while it could happen, is unlikely to have been triggered from California. Still, the conditions may be ripe for a moderate quake in northern Turkey or Greece at this time. Both areas respond to geomagnetic storms." (July 10, 2019)

 

This is the strongest earthquake in the region of Crete since and M 4.8 on January 1, 2019 with the last of larger magnitude in the area an M 5.3 on July 31, 2017. Forecast 117150 had expected this activity was likely around July 7.

 

O: 10JUL2019 22:57:14  34.9N   24.3E mb=4.5  EMSC   CRETE, GREECE                 

O: 10JUL2019 22:57:12  34.9N   24.3E mb=4.8  ANSS   CRETE, GREECE                

P:  7JUL2019 117150    36.0N   23.0E 3.0-4.9 BBAAA  Aegean Sea                 

 

The strongest earthquake in the world today was an M 5.2 in the area of the central Atlantic north of Ascension Island. It was not felt in this remote area. The last event of M>=5.2 within about 200 km of this epicenter occurred a year ago on July 11, 2018 with M 5.2. The last of larger magnitude was an M 5.9 on March 10, 2018.  Forecast 117077 had expected this event within about 150 km was likely around July 7. Like the earthquake in Crete, this event is near 103 degrees from California as was a moderate M 5.1 in the South Pacific today and was probably promoted by energy from the strong California quakes.

 

O: 10JUL2019 21:43:48   0.0S   16.9W Mw=5.2  EMSC   NORTH OF ASCENSION ISLAND    

P:  7JUL2019 117077     1.0S   16.0W 4.0-5.4 AAAAA  Central Mid-Atlantic       

 

The strongest earthquake in the U.S. or Canada today outside the Ridgecrest aftershocks zone was an M 4.0 in the Kenai Peninsula, Alaska. NEIC reported this earthquake of M 3.2 in Kenai Peninsula, Alaska was felt with intensity II-III in the area(s) of Kenai Peninsula, Alaska  This follows earthquakes of M 4.6 and 4.7 on July 2-3, 2019 in the activation of Alaska at the time, the first of M>4 in the area of Kenai since an M 4.2 on May 10, 2019 and an M 4.4 on January 9, 2019. Forecast 117288 had expected today's activity was likely around July 7.

 

O: 10JUL2019 06:39:55  60.4N  150.2W ML=4.0  EMSC   KENAI PENINSULA, ALASKA      

O: 10JUL2019 09:03:26  60.5N  150.2W ML=3.3  EMSC   KENAI PENINSULA, ALASKA      

P:  7JUL2019 117288    60.1N  150.6W 3.2-5.0 BAAAA  Central Alaska             

 

Six earthquakes of M>=4 occurred in the Ridgecrest-Coso Junction region of California today and were felt with moderate intensity in the aftershock zone. These included an M 4.5 and 4.1. A listing of events in the region today of M>=2.5 is located under the "CALIFORNIA" section of this summary. Forecast 117152 had expected today's activity was likely around July 9.

 

O: 11JUL2019 00:15:39  36.2N  117.9W Mw=4.4  EMSC   CENTRAL CALIFORNIA

O: 11JUL2019 00:14:37  36.2N  117.9W Mw=4.5  EMSC   CENTRAL CALIFORNIA

O: 11JUL2019 04:10:01  36.1N  117.9W Mw=4.3  EMSC   CENTRAL CALIFORNIA

O: 11JUL2019 07:04:05  36.2N  117.9W Mw=4.0  EMSC   CENTRAL CALIFORNIA

O: 10JUL2019 20:09:51  35.7N  117.5W Mw=4.2  EMSC   SOUTHERN CALIFORNIA

O: 10JUL2019 12:28:56  36.1N  117.9W Mw=4.1  EMSC   CENTRAL CALIFORNIA

P:  9JUL2019 117152    36.1N  118.1W 2.5-4.5 AAAAA  California/Nevada area     

 

 

MODERATE QUAKES IN MINDANAO; FOX ISLANDS, ALEUTIANS AND SEA OF OKHOTSK

 

EARTHQUAKE SUMMARY FOR JULY 9, 2019

 

Moderate earthquakes of M 5.4-5.6 hit several areas today including central Mindanao, Philippines, the Fox Islands, Aleutians and the Sea of Okhotsk. This occurred as the geomagnetic field became the most active in a month and far-field triggering from California continued.

 

The strongest earthquake in the world today was an M 5.6 in Mindanao, Philippines. NEIC reported maximum intensity VI in Southern Mindanao at Bulacan with V in Koronadal, Bansalan, and Saguing and IV in Dlo, Digos, Kalaisan, Bato, Carpenter Hill and Tacumong, Central Mindanao, Philippines. NEIC reported an aftershock of M 5.1 in Mindanao, Philippines was felt with intensity V i Balutakay, Southern Mindanao; IV in Davao and II-III in the area(s) of Koronadal and Barra, Mindanao, Philippines. An earlier M 4.9 was felt with intensity VI in Davao, Southern Mindanao, Philippines. A second M 4.9 was felt with intensity V in Davao and Bato and II in Koronadal and Mahayag, Southern Philippines. This activity is on the geomagnetic equator and may have been promoted by today's moderate geomagnetic storm. It is also at 106 degrees from Southern and Central California where an M 7.1 quake on July 5 may have helped promote activity in the Mindanao area.

 

"The geomagnetic field saw disturbed conditions today. The AP level was 17.  High latitude geomagnetic field also saw unsettled conditions  with AP at 19. This is the strongest disturbance in the geomagnetic field in a month - since it reached 18 on June 8. Some geomagnetic effects may enhance seismicity near the geomagnetic equator and at high latitudes with this active period." (July 9, 2019)

 

The last earthquake of M>=5.6 within about 100 km of this epicenter in southern Mindanao was an M 5.9 on May 10, 2018. Forecasts 117071 and 117063 had expected today's activity around July 7-8.

 

O:  9JUL2019 12:36:59   6.8N  125.1E Mw=5.6  EMSC   MINDANAO, PHILIPPINES        

O: 09JUL2019 14:12:57   6.9N  125.1E mb=4.9  EMSC   MINDANAO, PHILIPPINES

O: 09JUL2019 15:31:46   6.9N  125.1E mb=4.9  EMSC   MINDANAO, PHILIPPINES

O: 10JUL2019 00:56:36   6.9N  125.1E mb=5.1  EMSC   MINDANAO, PHILIPPINES

O: 10JUL2019 00:32:04   7.4N  124.9E ML=4.8  EMSC   MINDANAO, PHILIPPINES

P:  7JUL2019 117071     6.0N  125.0E 4.0-5.6 AAAAA  Mindanao, Philippines      

P:  8JUL2019 117063     7.0N  126.0E 4.0-5.4 AAAAA  Central Philippines        

 

In addition to the eastern Indonesia and Philippines area, another region at or near 103 degrees from the California events is the North Anatolian Fault in Turkey and Greece. This area has been active before the new moon/eclipse of July 2 but has shown a substantial decrease in seismicity since that time. This could be a seismic quiescence before a moderate to strong regional quake. Energy  on the surface from California does not have a good angle with the east-west orientation of the North Anatolian Fault though, so a major quake in this area, while it could happen, is unlikely to have been triggered from California. Still, the conditions may be ripe for a moderate quake in northern Turkey or Greece at this time. Both areas respond to geomagnetic storms. Another area showing strongly reduced seismicity in the past two weeks is the northern Caribbean. This area often becomes active with the hurricane season.

 

The largest earthquake in the U.S. or Canada today was an M 5.4 in the Fox Islands, Aleutians, Alaska.  NEIC reported it was felt with intensity III in Unalaska, Alaska.  This is an active area but has been quiet in recent months.  The last earthquake of M>=5.4 in the area within about 200 km of this epicenter in the Fox Islands occurred on May 24,, 2017 with M 5.9. The last of M>=6 in the Fox Islands was an M 6.2 on August 10, 2012. Forecast 117271 had expected today's event within about 150 km of this epicenter around July 7.

 

O:  9JUL2019 18:43:43  52.9N  167.5W Mw=5.4  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O:  9JUL2019 21:01:35  52.9N  167.5W ml=3.7  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  7JUL2019 117271    52.3N  165.7W 3.5-5.2 AAAAA  Fox Islands, Aleutians     

 

The earthquake in the Sea of Okhotsk was the strongest in that region since an M 6.0 on November 2, 2018. An M 7.7 hit the region on August 14, 2012, a very active period for the area from this to the Aleutians following a solar eclipse. Forecast 117253 had expected today's activity around July 8. Earthquakes in this region occur at intermediate to deep focal depths and are not strongly felt on the surface.

 

O:  9JUL2019 11:33:30  47.5N  145.0E Mw=5.5  EMSC   SEA OF OKHOTSK               

P:  8JUL2019 117253    45.0N  147.0E 3.5-5.6 ACBAA  So. Kurils                 

 

Light aftershocks in southern and Central California continued to be felt with intensity II-III in the area from Ridgecrest to Coso Junction and north. This pattern is expected to continue for at least a week more. Two of these were M>=4 and are listed below. A listing of events of M>=3 in the Ridgecrest aftershock area today can be found in the "CALIFORNIA" section below.

 

O: 10JUL2019 01:43:02  35.9N  117.7W Mw=4.0  EMSC   CENTRAL CALIFORNIA

O: 10JUL2019 00:48:17  36.1N  117.9W Mw=4.1  EMSC   CENTRAL CALIFORNIA

P:  9JUL2019 117152    36.1N  118.1W 2.5-4.5 AAAAA  California/Nevada area     

 

An earthquake of M 3.5 also occurred south of Hawaii in the Loihi Seamount area. It was not reported felt. This area last saw a volcanic eruption in 2005 but the last event of M>=3.5 in the area was an M 3.9 on October 14, 2018 and prior to that

an M 5.2 on June 5, 2013. Increased seismicity in this area could indicate a nascent eruption and a change in Hawaiian seismicity and volcanism. Forecast 117109 expected activity in the area around July 8.

 

O:  9JUL2019 09:37:28  18.8N  155.2W Ml=3.5  EMSC   HAWAII REGION, HAWAII        

P:  8JUL2019 117109    19.2N  155.2W 3.0-4.5 AAAAA  Hawaii                     

 

TRIGGERING NEAR 103 DEGREES FROM CALIFORNIA CONTINUES

 

EARTHQUAKE SUMMARY FOR JULY 8, 2019

 

In previous summaries the distance of or near 103 degrees from the earthquakes in Southern California of July 4-5 has been emphasized as a zone of high seismic enhancement. Un usual and moderate to strong quakes since the California events have occurred  in the Pacific-Antarctic Ridge (M 5,2) and Queensland, Australia (M 4.7) among others. In the last issue this was noted as:

 

"(earthquakes at or near) 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying ma by stipled

white lines." (July 6-8, 2019)

 

 

"In the previous issue of this summary, it was noted that a high probability  occurred for a moderate to strong quake in Papua, New Guinea which is at 103 degrees from Southern California. This area had an M 8.0 on January 10, 1971 a month before the M 6.7 San Fernando quake and is watched for precursory activity by this summary." (July 8, 2019)

 

The strongest non-aftershock earthquake in the world today was an M 5.8 in Papua New Guinea at a distance of 103 degrees from the California epicenter. This is probably an enhanced aftershock of events of M 6.1 and 6.3 on June 20 and 23. There was also a series of moderate quakes in Mindanao and northern Mindanao, Philippines today at 103 degrees from Southern California.

 

 

The second largest earthquake of the day was an M 5.7 in Western Iran. NEIC reported maximum intensity VII in Iran at Khuzestan and lesser shaking within abotu 200 km of the epicenter, It was accompanied by several moderate aftershocks. The last earthquake within about 250 km of this epicenter with M>=5.7 was an M 6.2 and aftershocks on August 18, 2014. Forecasts 117145 and 117202 had expected a moderate quake in the area was likely around July 3-7. This epicenter is at 110-111 degrees from Southern California and may have been promoted by seismic energy from that area. It is also at 103 degrees

from the M 7.5 in New Britain of May 14, 2019.

 

O:  9JUL2019 04:47:32  31.8N   49.4E mb=4.5  EMSC   WESTERN IRAN                 

O:  8JUL2019 07:00:32  31.8N   49.6E mb=5.7  EMSC   WESTERN IRAN                 

P:  3JUL2019 117145    29.0N   51.0E 3.5-5.1 BCBAA  So. Iran/Persian Gulf      

P:  7JUL2019 117202    34.0N   49.0E 3.8-5.2 ACAAA  So. Iran                   

 

Moderate earthquakes in Taiwan and Afghanistan (M 4.7, 4.5) also lie near 103 degrees from Southern California and may have been promoted from that source.

 

O:  8JUL2019 18:35:35  23.9N  122.6E mb=4.7  EMSC   TAIWAN REGION                

P:  6JUL2019 117148    24.0N  124.0E 4.0-5.4 AAAAA  Taiwan                     

 

O:  8JUL2019 22:46:33  36.3N   70.8E mb=4.5  EMSC   HINDU KUSH REGION, AFGHANISTAN

P:  8JUL2019 117170    36.0N   72.0E 3.8-5.6 AAAAA  Hindu Kush/Pakistan        

 

An aftershock in the Molucca Sea of M 5.9 also occurred today along with 12 other moderate aftershocks. These follow the M 6.9 ini the area yesterday. At this time it was noted in this summary as:

 

"The strongest earthquake in the world today was an M 6.9 in the Molucca Sea of eastern Indonesia. It was accompanied by a strong aftershock sequence. NEIC reported it was felt with intensity IX in Ternate, Maluku; V in Bitung, Sulawesi and IV in Tomohon and Manado, Sulawesi, Indonesia. This area is near 103 degrees from Southern California and was probably  promoted by energy reflected and refracted off core-mantle boundaries back to the surface." (July 8, 2019)

 

and

 

"Forecast 117069 had expected today's activity in the Molucca Sea was likely  within about 100 km of these epicenters around July 7. The last event in the Molucca Sea of M>=6.9 within about 200 km of today's epicenter was an M 7.1 on November 15, 2014 and prior to that an M 7.3-7.5 on January 21, 2007. The only other such event in the area in the past 30 years was an M 7.1 on February 24, 2001." (July 8, 2019)

 

O: 08JUL2019 23:04:48   0.5N  126.3E ML=4.0  EMSC   MOLUCCA SEA

O: 09JUL2019 04:06:29   0.5N  126.3E ML=4.0  EMSC   MOLUCCA SEA

O: 08JUL2019 18:52:32   0.5N  126.3E Mw=5.9  EMSC   MOLUCCA SEA

O: 08JUL2019 21:41:11   0.5N  126.4E mb=4.6  EMSC   MOLUCCA SEA

O: 08JUL2019 21:30:47   0.5N  126.4E mb=4.9  EMSC   MOLUCCA SEA

O: 08JUL2019 19:00:40   0.5N  126.4E mb=5.0  EMSC   MOLUCCA SEA

O: 08JUL2019 19:54:12   0.6N  126.4E mb=4.8  EMSC   MOLUCCA SEA

O: 08JUL2019 18:21:41   0.6N  126.5E mb=4.4  EMSC   MOLUCCA SEA

O: 08JUL2019 20:57:40   0.6N  126.5E mb=4.5  EMSC   MOLUCCA SEA

O: 08JUL2019 23:58:34   0.7N  126.2E mb=4.9  EMSC   MOLUCCA SEA

O: 08JUL2019 20:10:14   0.7N  126.6E ML=4.0  EMSC   MOLUCCA SEA

O:  8JUL2019 19:28:18   0.5N  126.3E ML=4.0  EMSC   MOLUCCA SEA                  

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in Northern  Alaska in the aftershock zone in the north shore. This area became active on August 12, 2018 with the cessation of the Hawaii volcanic eruption last summer. Following

March 13, 2019 it quieted down at the M>=4.1 level until the activation of activity in Alaska (which led to the activation further south) on July 3, 2019. That included an M 5.3 and 4.6 in the area. Forecast 117296 expected today's activity in early July.

 

O:  8JUL2019 23:20:27  69.1N  144.6W Mw=4.1  EMSC   NORTHERN ALASKA              

P:  2JUL2019 117296    69.0N  144.0W 3.0-4.8 CAAAA  Northern Alaska            

 

STRONG M 6.9 STIKES MOLUCCA SEA, EASTERN INDONESIA

 

EARTHQUAKE SUMMARY FOR JULY 7, 2019

 

The strongest earthquake in the world today was an M 6.9 in the Molucca Sea of eastern Indonesia. It was accompanied by a strong aftershock sequence. NEIC reported it was felt with intensity IX in Ternate, Maluku; V in Bitung, Sulawesi and IV in Tomohon and Manado, Sulawesi, Indonesia. This area is near 103 degrees from Southern California and was probably  promoted by energy reflected and refracted off core-mantle boundaries back to the surface. Previous issues of this summary had suggested this possibilty as:

 

"California seismicity, especially around Southern California was enhanced today. Eight earthquakes outside the immediate Ridgecrest aftershock zone reach M>-3 magnitudes today  in this area. One of the specialties of this summary, not generally available elsewhere is enhancement of seismicity at far-field distances. These generally include enhanced seismicity at nodal distances (51, 60, 72. 90, 103, 120, 144 and 180 degrees) from the epicenter of the major earthquake. Areas at 180 degrees from Southern California include the southwest Indian Ridge (35S 63E) which is active and could see a moderate seismic event. At 144 degrees lie areas of the Carlsberg Ride, Southeast Africa including Swaziland and Tanzania. Those a or near 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying ma by stippled white lines." (July 6, 2019)

 

Forecast 117069 had expected today's activity in the Molucca Sea was likely within about 100 km of these epicenters around July 7. The last event in the Molucca Sea of M>=6.9 within about 200 km of today's epicenter was an M 7.1 on November 15, 2014 and prior to that an M 7.3-7.5 on January 21, 2007. The only other such event in the area in the past 30 years was an M 7.1 on February 24, 2001.

 

In the previous issue of this summary, it was noted that a high probability occurred for a moderate to strong quake in Papua, New Guinea which is at 103 degrees from Southern California. This area had an M 8.0 on January 10, 1971 a month before the M 6.7 San Fernando quake and is watched for precursory activity by this summary. An M 6.1 on June 24, 2019 and an M 6.3 on June 19, 2019 may have been precursory to the activity in Southern California:

 

"An M 4.0 in Papua was at 103 degrees from Ridgecrest. Other activity today in the area of eastern Indonesia suggested high enhancement in the region from Southern California." (July 7, 2019)

 

and

 

 

"The second strongest earthquake in the world today was an M 6.3 in New Guieea, Indonesia. NEIC reported it was felt with intensity IV in Jaya Pura, Papua New Guinea, Indonesia.\ This is the strongest earthquake within about 200 km of this epicenter since an M 7.0 on July 27, 2015 and a similar M 7.0 on April 6, 2013.  Forecast 116640 expected today's event to the south was likely in mid-June. This epicenter is at 145 degrees from the M 8.0 in Peru of May 26 and the M 7.5 in Ecuador of February 22, 2019. Seismic energy concentrates on the surface at this distance from large mainshock and can help promote additional seismicity at this distance. It is also located at the seventh node (51 degrees) from the Kermadec Islands." (June 20, 2019)

 

and following an M 7.2 in April, 2013 a more thorough discussion was found in this summary as:

 

"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.  While seismicity

in southern California is likely to increase in the coming days the most likely time for a significant regional earthquake appears to be around May 4-8, 2013 on the basis of this historical context." (April 6, 2013)

 

 

O: 07JUL2019 15:36:46   0.4N  126.0E ML=4.0  EMSC   MOLUCCA SEA

O: 07JUL2019 16:39:12   0.4N  126.1E ML=4.2  EMSC   MOLUCCA SEA

O: 07JUL2019 16:34:06   0.4N  126.2E ML=4.0  EMSC   MOLUCCA SEA

O: 07JUL2019 17:03:17   0.4N  126.2E ML=4.3  EMSC   MOLUCCA SEA

O: 07JUL2019 18:35:06   0.4N  126.2E mb=4.6  EMSC   MOLUCCA SEA

O: 07JUL2019 17:05:19   0.5N  126.1E mb=4.8  EMSC   MOLUCCA SEA

O: 08JUL2019 02:49:44   0.5N  126.1E mb=4.8  EMSC   MOLUCCA SEA

O: 07JUL2019 20:35:20   0.5N  126.2E ML=4.1  EMSC   MOLUCCA SEA

O: 07JUL2019 15:08:39   0.5N  126.2E Mw=6.9  EMSC   MOLUCCA SEA

O: 07JUL2019 18:17:27   0.5N  126.2E mb=4.6  EMSC   MOLUCCA SEA

O: 07JUL2019 15:29:18   0.5N  126.2E mb=4.9  EMSC   MOLUCCA SEA

O: 07JUL2019 15:44:00   0.5N  126.2E mb=4.9  EMSC   MOLUCCA SEA

O: 08JUL2019 06:20:15   0.5N  126.2E mb=5.4  EMSC   MOLUCCA SEA

O: 07JUL2019 16:00:54   0.5N  126.3E ML=4.0  EMSC   MOLUCCA SEA

O: 07JUL2019 17:15:28   0.6N  126.3E ML=4.1  EMSC   MOLUCCA SEA

O: 08JUL2019 02:24:40   0.6N  126.3E mb=5.1  EMSC   MOLUCCA SEA

O: 08JUL2019 04:16:17   0.6N  126.4E mb=5.0  EMSC   MOLUCCA SEA

O: 07JUL2019 20:01:39   0.7N  126.3E ML=4.2  EMSC   MOLUCCA SEA

O:  7JUL2019 16:18:24   0.3N  126.1E ML=4.0  EMSC   MOLUCCA SEA                  

P:  7JUL2019 117069     1.0N  127.0E 4.0-5.5 AAAAA  Halmahera                  

 

A series of other moderate earthquakes occurred near 103 degrees from Southern  California today. Among these were two of M 4.3 and 4.4 in the Hindu Kush region

of Afghanistan.

 

O:  7JUL2019 10:04:09  36.5N   70.8E mb=4.4  EMSC   HINDU KUSH REGION, AFGHANISTAN

O:  7JUL2019 09:33:44  36.6N   70.9E mb=4.1  EMSC   HINDU KUSH REGION, AFGHANISTAN

P:  8JUL2019 117170    36.0N   72.0E 3.8-5.6 AAAAA  Hindu Kush/Pakistan        

 

With reduced seismicity in California, the largest earthquake in the U.S. or Canada returned to Alaska where an M 4.3 was recorded in the Gulf of Alaska. It was not reported felt in this remote area. This is the largest aftershock in the Gulf of Alaska series since an M 4.9 on April 8, 2019 and prior to that an M 4.4 on February 23, 2019. These are aftershocks of the M 7.9 which hit the area on January 23, 2018.

 

O:  7JUL2019 16:03:32  56.2N  149.9W mb=4.3  EMSC   GULF OF ALASKA               

 

An unusual earthquake of M 4.7 also hit in Queensland, Australia today. It was not reported felt in this area. It occurred at 103 degrees from the epicenter of the M 7.1 in Southern California of July 5 and was probably promoted from that source. The only similar event in Queensland in the past 30 years was and M 4.8 on November 19, 2007.

 

O:  7JUL2019 18:54:28  10.1S  142.4E ML=4.7  EMSC   QUEENSLAND, AUSTRALIA        

P:  3JUL2019 117084     7.0S  145.0E 4.0-5.4 BCCAA  New Ireland                

 

FAR FIELD TRIGGERING FROM CALIFORNIA QUAKES

 

EARTHQUAKE SUMMARY FOR JULY 6, 2019

 

No more strong earthquakes in the neighborhood of southern or Central California occurred today although moderate aftershocks were common including at least 15 of M>=4 and more than 130 of M?=3 today. Rescue and cleanup continue today but few people were injured and no deaths were reported with the quakes. Fires were common and property damage has been estimated in the hundreds of millions of U S. Dollars. The governor of California has declared the affected counties, disaster zones. There has been a migration to the north from the initial activity reaching Coso Junction and Central California today. These active areas and those to the west of the mainquakes can see further enhanced seismicity in the next several days.

 

This summary will concentrate on far-field triggering from the M 7.1 event of July 5. This is large enough to have an effect on distant earthquakes but on the low end, In this summary yesterday it was noted in this regard:

 

 

"California seismicity, especially around Southern California was enhanced today. Eight earthquakes outside the immediate Ridgecrest aftershock zone reach M>-3 magnitudes today in this area. One of the specialties of this summary, not generally available elsewhere is enhancement of seismicity at far-field distances. These generally include enhanced seismicity at nodal distances (51, 60, 72. 90, 103, 120, 144 and 180 degrees) from the epicenter of the major earthquake. Areas at 180 degrees from Southern California include the southwest Indian Ridge (35S 63E) which is active and could see a moderate seismic event. At 144 degrees lie areas of the Carlsberg Ride, Southeast frica including Swaziland and Tanzania. Those a or near 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying ma by stippled white lines." (July 6, 2019)

 

The strongest earthquake in the world today was an M 5.8 in the region of Vanuatu. This epicenter is neat the fourth node (90 degrees) from Southern California and was probably promoted from that source. The only such quakes in this area with M>=5.8 during 2019 occurred on May 19, 2019 with M 5.9-6.2. Forecast 117326 expected today's activity was likely around July 7.

 

NEIC reported this earthquake of M 5.6 in Southern Vanuatu was felt with intensity II-III in the area(s) of New Caledonia.

 

O:  6JUL2019 11:08:17  21.0S  169.9E mb=5.8  EMSC   VANUATU                      

P:  7JUL2019 117326    23.0S  170.0E 4.0-5.6 ABAAA  Loyalty Islands            

 

A moderately large M 5.5 also occurred today in the Bougainville, New Britain region of New Guinea. This is the strongest event within about 200 km of this epicenter since an M 5.8 on August 22, 2018. The M 7.5 of May 15 in New Britain occurred about 300 km northwest of today's epicenter. Today's event is, like that in Vanuatu, at the fourth node (90 degrees) from the M 7.1 in Southern California and was probably promoted from that source. Forecast 117083 had expected today's epicenter would be active within about 100 km around July 7.  An M 4.0 in Papua was at 103 degrees from Ridgecrest. Other activity today in the area of eastern Indonesia suggested high enhancement in the region from Southern California.

 

 

O:  6JUL2019 09:44:28   6.3S  154.8E Mw=5.5  EMSC   BOUGAINVILLE REGION, P.N.G.  

P:  7JUL2019 117083     7.0S  154.0E 4.0-5.4 AAAAA  New Britain                

 

O:  7JUL2019 04:01:51   2.2S  138.9E ML=4.0  EMSC   PAPUA, INDONESIA             

P:  3JUL2019 117096     3.0S  139.0E 4.0-5.6 BAAAA  West Irian, PNG            

 

O:  7JUL2019 07:51:05   6.2S  147.4E mb=4.8  EMSC   EASTERN NEW GUINEA REG., P.N.G

P:  6JUL2019 117084     6.0S  148.0E 4.0-5.4 AAAAA  New Ireland                

 

O:  6JUL2019 06:37:51   6.9S  144.3E ML=4.5  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P:  3JUL2019 117084     7.0S  145.0E 4.0-5.4 BAAAA  New Ireland                

 

A series of moderate quakes in the Jan Mayen area of northern Europe occurred at the sixth node from California today.

 

O:  6JUL2019 14:25:40  69.8N   15.4W mb=4.4  EMSC   JAN MAYEN ISLAND REGION      

O:  6JUL2019 14:12:56  69.8N   15.5W mb=4.6  EMSC   JAN MAYEN ISLAND REGION      

O:  6JUL2019 12:21:50  69.8N   15.6W mb=4.3  EMSC   JAN MAYEN ISLAND REGION      

O:  6JUL2019 12:47:03  69.8N   15.7W mb=4.3  EMSC   JAN MAYEN ISLAND REGION      

O:  6JUL2019 12:34:14  69.9N   15.6W mb=4.4  EMSC   JAN MAYEN ISLAND REGION      

P:  9JUL2019 117303    71.0N   13.0W 3.5-5.2 BAAAA  Jan Mayen Isl. area        

 

A listing of aftershocks of M>-4 in the region of Ridgecrest follows. A listing for events of M>=3 is located under the "CALIFORNIA" section below.

 

O: 06JUL2019 06:12:51  35.6N  117.4W ML=4.3  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 08:32:55  35.6N  117.5W mb=4.8  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 08:59:55  35.6N  117.4W Mw=4.1  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 10:48:24  35.6N  117.4W ML=4.1  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 16:36:05  35.6N  117.5W Ml=4.1  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 05:58:20  35.7N  117.7W mb=4.4  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 07:54:46  35.7N  117.6W ML=4.1  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 23:21:34  35.7N  117.5W ML=4.0  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 06:41:15  35.8N  117.6W ML=4.1  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 23:50:41  35.8N  117.7W Mw=4.5  EMSC   CENTRAL CALIFORNIA

O: 07JUL2019 05:38:15  35.8N  117.6W Mw=4.5  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 06:34:47  35.9N  117.7W ML=4.3  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 07:04:42  35.9N  117.7W ML=4.1  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 13:06:55  35.9N  117.7W Mw=4.5  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 17:41:33  35.9N  117.7W Mw=4.0  EMSC   CENTRAL CALIFORNIA

P:  5JUL2019 117200    35.6N  118.4W 2.5-4.4 AAAAA  So. California             

P:  9JUL2019 117153    36.8N  117.5W 2.5-4.4 BBAAA  California/Nevada area     

 

What happened in Central Chile? This summary had expected the possibility of a strong quake in that region near the timje of the solar eclipse and new moon of July 2 as:

 

"A solar eclipse will be seen today in the region of southern Pacific Ocean, West Chile Rise, East Pacific Rise and Central Chile. Solar eclipses have been known to be associated with major events in South America in the past. For example, a total solar eclipse of June 21, 2001 which began over South America was accompanied by  an M 8.4 in Peru on June 23, 2001, a quake which devastated the area and killed thousands. The coincidence of these two events was probably not happenstance. A further example is the Izmit, Turkey event of August 1999 which coincided with the most complete solar eclipse in Europe in centuries. Because this is a high southern latitude event, other areas at high southern latitudes could also see enhanced seismicity in the next several days.  A moderate earthquake in the La Araucania area of central Chile may be a foreshock to a larger event associated with today's solar eclipse." (July 1-2, 2019)

 

Instead what occurred was the M 7.1 and 6.4 in Southern and Central California at the same distance north of the equator as this area of Chile is south of the equator. This region of Chile, however, does appear to have been strongly affected by the conditions associated with the solar eclipse, but not be seismic enhance but by seismic quiescence. A strong quiet period in this region of Chile began with the eclipse and continues to this day. No moderate earthquakes have been recorded in this region since the eclipse, highly unusual for this active area. The stresses appear to have dampened regional seismicity. If a strong quake should occur in early July, it is now expected near the time of the full moon near July 16.

 

MAJOR SEISMICITY CONTINUES IN SOUTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR JULY 5, 2019

 

A major M 7.1 earthquake hit the Ridgecrest region of Southern and Central  California overnight on July 6 (July 5 local time). It caused damage throughout the same area which was affected by the M 6.4 on July 4, but major damage to  infrastructure in the Los Angeles area appears to have been avoided, Today's event is about 10 times more powerful than the M 6.4 and is the strongest in Southern California since events of M 7.2-7.4 in the Lander area of California on October 16, 1999 and June 28, 1993 and is the largest within about 150 km of  Los Angeles since the M 7.7 Bakersfield quake of July 21, 1952. NEIC reported intensity up to IX (major damage) in the epicentral area with VIII in Trona, Inyokern; VII in Ridgecrest and VI in Randsburg, Weldon and Lake Isabella among others. This quake was felt from Mexico to Oregon and from the Rocky Mountains in  Nevada, Arizona and others.

 

PRIOR INDICATORS TO CALIFORNIA QUAKE:

 

Readers are encouraged to re-read the prior issue of this summary for further details of the seismic activity the Ridgecrest area. This is not repeated here. Some of the prior indicator seismicity in the U.S. was not included in that summary though and is included below.

 

Two prior and recent indicator earthquakes to the events in California occurred in late June. These included an M 4.6 in northern Kansas and a series in 

western Pennsylvania of M>=4. When the earthquake in Kansas occurred on June 22 this summary noted the possible relation to a strong California upcoming quake  as:

 

"As noted in previous issues of this summary, moderate earthquakes in the area  of Kansas, Nebraska and South Dakota are often followed within hour by moderate  to strong quakes along the western boundary of North America ..." (June 22, 2019)

 

and

 

"The most unusual and largest earthquake in the U.S. or Canada outside Hawaii today was an M 4.2 in Nebraska. NEIC reported it was felt with intensity IV in Nebraska at Arnold and North Platte and II-III in Callaway, Stapleton, Brady.  Earthquakes in this area often precede by hours to days moderate to strong earthquakes along the western rim of the North American Plate. These are usually  in the region of Alaska but can occur as far south as California." (June 30,,  2018)

 

On June 12-13 a series of moderate earthquakes also occurred in western  Pennsylvania and Ohio. This summary noted the relation between these and past

occurrences of subsequent events in California as:

 

"The active period in the northeastern U.S. continued today with an M 3.4 and  and aftershocks of M 1.4 in the Mifflintown, Pennsylvania. This event was widely  felt in Pennsylvania according to NEIC. Intensity II-III was reported from  Pennsylvania at Honey, Grove, Ickesburg, Port Royal, Blain, East Waterford,  Elliotsvurg, Mifflin, New Germantown, Landisburg, and Lewistown, It was also  reported felt as far as New Jersey, Maryland, Virginia, New York, Connecticut, Massachusetts, Ohio,  and Michigan and in general within about 500 km of the  epicenter. This follows an M 4.0 in Ohio two days ago and an M 3.0 in Quebec  before that. Today's event is about 200 km east of the Ohio quake but is  probably not an aftershock. Today's event is the strongest in western  Pennsylvania within about 200 km of this epicenter since a similar M 3.4 on July  16, 2010 and prior to that an M 3.4 on December 27, 2008. The only events of  larger magnitude in the area in the past 30 years was an M 4.2 and M 4.6 on  January 16, 1994 hours before the M 6.7 in Northridge, California. There is a history of earthquakes in this area being associated with significant seismicity  in the region of California and has often been noted in this summary. When the  earthquake in Ohio occurred this summary noted:

 

"Half a day after the event in Quebec, an M 5.0 occurred in the antipodal area of Quebec in the southeast Indian Ridge, Indian Ocean. It is notable as it

occurred within about 300 km of the exact antipode (compare 47S 103E with 47S 105E) in an area of generally light seismicity, The exact nature (if any) of

this antipodal pair is not clear at this time. This is the strongest earthquake within about 300 km of the epicenter in the Southeast Indian Ridge since an M 5.3 on December 10, 2017 and prior to that an M 5.1 on May 29, 2015." (June 8-9,  2019)

 

and

 

"This appears to be part of the activation of the region of California which has been described in the previous issues of this summary. Activation of this region is often accompanied by activation in the northeastern U.S. and Quebec, Canada  regions, an area where unusual seismicity in Ohio to Quebec has occurred over  the past several days and both areas may see this continue for several more  days." (June 11-12, 2019)

 

When the M 3.4 hit Pennsylvania in December, 2008 this summary also noted the relation with seismicity in California as:

 

"An unusual earthquake of M 3.4 hit Pennsylvania yesterday along with an M 4.5 in northern California and an M 5.9 in Vancouver. These events together show a  major shaking episode for North America. such episodes often include a strong  earthquake" (December 27, 2008)

 

and

 

"It is uncommon for a series of moderate earthquake to his throughout the  region. Often, especially when one epicentral area is located in Pennsylvania

such groups of events in the eastern U.S. are followed by a large or major  earthquakes along the western North American and Pacific plate boundary in  California" (October 25-26, 2009) and  (June 12-13, 2019)

 

A listing of aftershocks of M>-4 in he region of Ridgecrest follows. A listing for events of M>=3 is located under the "CALIFORNIA" section below.

 

O: 06JUL2019 06:41:15  35.8N  117.6W ML=4.1  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 06:34:47  35.9N  117.7W ML=4.3  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 06:12:51  35.6N  117.4W ML=4.3  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 06:01:51  35.9N  117.7W Mw=4.6  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 05:58:17  35.9N  117.7W ML=4.4  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 05:25:04  35.8N  117.7W mb=4.2  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 05:13:15  35.9N  117.7W ML=4.2  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 04:58:36  35.7N  117.6W ML=4.1  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 04:52:17  35.9N  117.7W ML=4.6  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 04:40:16  35.6N  117.5W ML=4.4  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 04:36:56  35.7N  117.7W Mw=4.9  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 04:19:54  35.9N  117.7W ML=4.2  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 04:13:07  35.6N  117.7W mb=4.7  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 04:07:04  35.6N  117.5W ML=4.6  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 03:55:20  35.9N  117.7W ML=4.3  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 03:50:59  35.9N  117.7W mb=5.0  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 03:49:52  35.8N  117.7W ML=4.0  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 03:46:26  35.7N  117.5W ML=4.4  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 03:41:38  35.9N  117.7W ML=4.0  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 03:36:16  35.9N  117.7W ML=4.5  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 03:32:46  35.9N  117.7W ML=4.5  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 03:30:25  35.6N  117.4W ML=4.7  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 03:28:46  35.9N  117.7W Ml=4.2  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 03:27:05  35.9N  117.7W ML=4.5  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 03:25:27  35.8N  117.7W ML=4.8  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 03:23:50  35.8N  117.6W Ml=5.4  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 03:22:03  35.9N  117.7W Ml=4.6  EMSC   CENTRAL CALIFORNIA

O: 06JUL2019 03:19:57  35.8N  117.6W Mw=7.1  EMSC   SOUTHERN CALIFORNIA

O: 06JUL2019 03:16:32  35.7N  117.6W mb=4.6  EMSC   SOUTHERN CALIFORNIA

O: 05JUL2019 17:02:36  35.6N  117.6W ML=4.2  EMSC   SOUTHERN CALIFORNIA

O: 05JUL2019 12:38:30  35.8N  117.6W Mw=4.1  EMSC   SOUTHERN CALIFORNIA

O: 05JUL2019 11:07:52  35.8N  117.6W Mw=5.4  EMSC   SOUTHERN CALIFORNIA

P:  5JUL2019 117200    35.6N  118.4W 2.5-4.4 AAAAA  So. California             

P:  9JUL2019 117153    36.8N  117.5W 2.5-4.4 BBAAA  California/Nevada area      

 

 

Some have requested that this summary add to the projections of subsequent seismikcity in the region of Southern California following the M 6.4 and 7.1 quakes over the past two days. It is not generally productive to second-guess local authorities who have better data access and are working full-time to make the best forecasts available to the public. They have noted the possibility of further moderate to large aftershocks exists, and we agree with that assessment in the short-term. While the current activity is not occurring on the San Andreas Fault, stress redistribution may affect the timing and size of further seismicity on that major California fault zone. Seismicity may also be enhanced to the south in the  local Los Angeles area. Readers are urged to look for unexpected clusters of earthquakes in the next several weeks. These could indicate an area of weakness where further enhanced seismicity is likely. For an earthquake in this area M 7.1 is probably near the maximum size. With the exception of the M 7.7 bKern County quake of July 21, 1952 no other events in the area have approached M 7.1. So it is reasonable to believe that a larger quake in the area is highly unlikely at this time,

Great quakes of M 8.3 and 8.5 hit the region on January 9, 1857 and March 26, 1972 but these were well north and west of the current activity. The Ridgecrest area is a highly active zone with light quakes nearly every day. A similar event to the M 6.4 hit on March 15, 1946.

 

Seismicity outside California also began to return today. The most active area was the Komandorsky Islands which saw an M 5.3 and several Ocean Ridges which included an M 5.1 in the Indian-Antarctic Ridge south of Australia and M 5.2 in the Pacific-Antarctic Ridge located at 103 degrees from

Southern California and probably promoted by the activity there.

 

O:  6JUL2019 06:13:25  63.2S  157.7W mb=5.2  EMSC   PACIFIC-ANTARCTIC RIDGE      

 

O:  5JUL2019 11:56:37  49.0S  127.5E mb=5.1  EMSC   WESTERN INDIAN-ANTARCTIC RIDGE

P:  9JUL2019 117351    49.0S  122.0E 4.0-5.8 BACAA  So. of Australia           

 

O: 05JUL2019 16:19:35  55.8N  164.4E mb=4.3  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 05JUL2019 12:57:38  56.0N  163.7E mb=4.2  EMSC   OFF EAST COAST OF KAMCHATKA

O: 05JUL2019 18:09:01  56.1N  164.2E mb=4.9  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 06JUL2019 05:29:52  56.2N  164.1E mb=4.9  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 06JUL2019 05:23:33  56.2N  164.3E mb=5.3  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 05JUL2019 16:14:01  56.3N  163.9E mb=4.7  EMSC   NEAR EAST COAST OF KAMCHATKA

O: 05JUL2019 14:33:50  56.3N  164.1E mb=5.0  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 05JUL2019 16:48:21  56.3N  164.2E mb=4.6  EMSC   KOMANDORSKIYE OSTROVA REGION

O:  5JUL2019 18:24:15  55.8N  164.3E mb=4.3  EMSC   KOMANDORSKIYE OSTROVA REGION 

P:  4JUL2019 117273    55.0N  166.0E 4.0-5.6 AAAAA  Komandorsky Isl            

 

 

An earthquake of M 5.6 in the Vancouver and Queen Charlotte Islands area also occurred today with associated shocks of M 4.5 and 4.6. This is an

aftershock of the M 6.3 that hit the region on July 3 and had been noted in this summary as:

 

"Today's M 5.8-6.2 in the Queen Charlotte Island area is the strongest in that region within about 100 km of today's epicenter since an M 6.2 on April 24, 2015. The last of larger magnitude in the area was an M 7.8 on October 28, 2012, an event associated with landfall of Hurricane Sandy on the New York East coast. Forecast 117268 had expected today's activity was likely around July 4 within about 50 km of the epicenter. The earthquake in British Columbia as well as those off the coast of Oregon are located at 103 degrees from the M 7.3 in the Banda Sea of June 24. Strong triggering can occur at this distance from large events." (July 3-4, 2019)

 

O:  5JUL2019 13:02:18  51.0N  131.0W mb=4.6  EMSC   VANCOUVER ISLAND, CANADA REGIO

O:  5JUL2019 12:51:38  51.3N  130.5W mb=4.5  EMSC   QUEEN CHARLOTTE ISLANDS REGION

O:  5JUL2019 12:58:28  51.3N  130.6W Mw=5.6  EMSC   QUEEN CHARLOTTE ISLANDS REGION

P:  4JUL2019 117268    50.5N  130.4W 3.0-5.0 AAAAA  British Colombia           

 

California seismicity, especially around Southern California was enhanced today. Eight earthquakes outside the immediate Ridgecrest aftershock zone reach M>-3 magnitudes today in this area. One of the specialties of this summary, not generally available elsewhere is enhancement of seismicity at far-field distances. These generally include enhanced seismicity at nodal distances (51, 60, 72. 90, 103, 120, 144 and 180 degrees)  from the epicenter of the major earthquake. Areas at 180 degrees from Southern California include the southwest Indian Ridge (35S 63E) which is active and could see a moderate seismic event. At 144 degrees lie areas of the Carlsberg Ride, Southeast Africa including Swaziland and Tanzania. Those a or near 103 degrees from Southern California include southern New Zealand, Greece and Turkey, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days and are marked on the accompanying ma by stipled white lines.

 

M 6.4 IN LOS ANGELES, CALIFORNIA REGION MAY BE 23-24 YEAR EVENT

 

EARTHQUAKE SUMMARY FOR JULY 4, 2019

 

An M 6.4 in Southern California today near Ridgecrest caused some major and much minor damage about 150 km northeast of Los Angeles, California today. Hospitals were evacuated  and fires broke out in the epicentral area. Local authorities reorted a strong aftershock  was considered possible. No deaths were reported with the earthqukae but injuries were reported. A number of cracks and other damage occurred to area roads. Television images showed goods thrown from shelves throughout

the area and damage estimates continued to rise. A state of emergency was declared for Ridgecrest where nearly 25 mddical and fire reports were answered. NEIC reported it was felt with maximum intensity and damage VII n Ridgcrest, Trona, Inyokern, VI in Onyx; V in California City, Weldon, Randsburg and Lone Pine along with communities throughout central and southern California. It was also reported felt in Arizona, Nevada, and many other as of western and central U.S. More than 20 aftershocks of M>=3 were recorded. The Southern California Earthquake Center said it was the largest in Southern California in about 20 years.

 

The last earthquake of M>-6.4 in Southern California (32-36N 115.5-120W) occurred October 16, 1999 in the Lander, California region east of Los Angeles with M 7.4. An M 7.2 hit Baja California slightly farther than this on Easter Day, April 4, 2010 but the last within about 200 km of Los Angeles of M>-6.4 was the Northridge earthquake of January 17, 2004 (M 6.7). Today's event may be the long awaitd 23-25 year event in the Los Angeles area as described below and in other previous issues of this summary.

 

A true foreshock to today's earthquake near Ridgecrest occurred January 31, 2019 with M 3.2. At the time this summary noted:

 

"An M 2.8 in Southern California also occurred today. NEIC reported this earthquake of M 2.8 in Southern California was felt with intensity II-III in the area(s) of Northridge, North Hills, Van Nuys, Encino, Reseda, Porter Ranch, and Winnetka, California among others. The M 2.8 was accompanied by a series of light earthquakes in the valleys west and south of Los Angeles. Seismicity in the Los Angeles area often increases in January and February. This includes the Northridge quake of

January 16, 1994 (M 6.7) and the San Fernando earthquake of February 9, 1971 (M 6.7). The time for stress to build up in the area may be about 23-25 years, consistent with the possibility of another such event on the horizon. This summary has noted this relation in the past. The Northridge event was preceded by a series of light earthquake south and west of Los Angeles not unlike the series which is now occurring. These may precede a moderate earthquake in the area...

 

An M 3.2 also occurred north of Los Angeles today.  NEIC reported this earthquake of M 3.2 in Southern California was felt with intensity II-III in the area(s) of Mojave and Palmdale, California. This is the strongest earthquake within about 50 km of this epicenter since an M 3.5 1.5 years ago on July 28, 2017 but the last nearer today's epicenter was an M 3.6 on June 4, 2017." (January 31, 2019)

 

 

Today's mainshock appears to be part of the regional activation of the western U.S. and Canada associated with the new moon and solar eclipse of July 2. The tidal forecast, published in previous issues of this summary for this new moon had read:

 

"The new moon will arrive on July 2 at 19:16 UT. Longitudinal areas most likely to see high tidal stresses with this event are near 80 East and 100 West. These areas include central Asia in the east and the central U.S. in the West (including the central Plains states where tidal triggering is common).  " (July 1-2, 2019)

 

In the previous issue of this summary a southeastern migration of the activatioh had been noted as: "ALASKAN ACTIVATION MOVES TO THE SOUTHEAST" (July 3, 2019)

 

The location of an unusual swarm west of today's mainshock was also noted in the previous issue of this summary as:

 

"A series of light earthquakes of M 2.0-3.5 occurred north of Los Angeles, California today NEIC reported these events were felt with intensity II-III in California at Frazier Park, Bakersfield, Tehachapi, Valencia and Moorpark. These events began about local solar noon and were probably promoted by the new moon" (July 3, 2019)

 

Another series of earthquakes which may have been related to the M 6.4 today began with the previous new moon on June 2, 2019 in eastern Los Angeles but has largely dissipated by today. This summary had noted this unusual activity at the time as:

 

"The swarm of light earthquakes in eastern Los Angeles, California continued today. NEIC reported this earthquake of M 3.1 in Los Angeles, California was felt with intensity IV in Fontana and II-III in the area(s) of Mira Loma, Riverside, Rancho Cucamonga, and Bloomington, Califorma among others. The largest was the M 3.1 but a number of smaller events in the area were also recorded. This is the largest to date in the current swarm. In the previous issue of this summary it had been noted as:

 

"A series of light earthquakes in eastern Los Angeles over the past several days may indicate an area of weakness waiting for a larger event. These earthquakes, are being felt with intensity IV in Fontana and Loma Linda and II-III within about 35 km of the epicenter at Mira Loma, Bloomington, Gardena, Fontana, Riverside, Ontario, Rancho Cucamonga and San Bernardino, California, among others.  This set began shortly after the M 8.0 in Peru of May 26 and may have been promoted

from that source, located near the seventh node (52 degrees) from Los Angeles. The orientation with Peru or New Britain is not conducive for this to expand much further at this time, however. Earthquakes of M>=2.9 within about 75 km of today's activity occurred on April 11 (M 3.4) and April 3 (M 3.6)." (June 2, 2019)

 

Below is a listing of aftershocks of M>=4 in the area. A list of M>-3 events is found under the "CALIFORNIA"  section of this report. Forecast 117200 had expected today's activity was likely around July 5 about 50 km to the east of the mainshock. This activity is  located near the fourth node (90 degrees) from the Kermadec Islands and from New Britain, the latest major earthquake and may have been promoted from those sources.

 

O: 05JUL2019 02:01:59  35.6N  117.6W Mw=4.0  EMSC   SOUTHERN CALIFORNIA

O: 05JUL2019 00:45:39  35.7N  117.5W ML=4.2  EMSC   SOUTHERN CALIFORNIA

O: 05JUL2019 00:32:06  35.7N  117.5W ML=4.1  EMSC   SOUTHERN CALIFORNIA

O: 05JUL2019 00:18:01  35.8N  117.6W ML=4.2  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 23:34:00  35.7N  117.5W ML=4.1  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 22:12:08  35.7N  117.6W mb=4.2  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 20:14:50  35.7N  117.5W ML=4.2  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 19:21:32  35.7N  117.5W Mw=4.5  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 18:56:06  35.7N  117.6W mb=4.4  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 18:54:13  35.6N  117.6W ML=4.1  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 18:47:06  35.7N  117.5W Mw=4.3  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 18:39:44  35.6N  117.6W mb=4.5  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 18:28:43  35.7N  117.6W mb=4.3  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 18:06:16  35.7N  117.5W ML=4.0  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 17:44:32  35.7N  117.5W ML=4.0  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 17:39:35  35.6N  117.6W ML=4.0  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 17:37:25  35.7N  117.5W ML=4.3  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 17:37:25  35.7N  117.5W ML=4.3  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 17:35:01  35.6N  117.6W ML=4.8  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 17:33:49  35.7N  117.5W Mw=6.4  EMSC   SOUTHERN CALIFORNIA

O: 04JUL2019 17:02:55  35.7N  117.5W Mw=4.0  EMSC   SOUTHERN CALIFORNIA

O:  5JUL2019 02:01:59  35.6N  117.6W Mw=4.0  EMSC   SOUTHERN CALIFORNIA          

P:  5JUL2019 117200    35.6N  118.4W 2.5-4.4 AAAAA  So. California             

 

 

A strong eruption of Stomboli Volcano near Sicily, Italy also occurred today. It was accomopanied by lava and ash flows.

 

ALASKAN ACTIVATION MOVES TO THE SOUTHEAST

 

EARTHQUAKE SUMMARY FOR JUNE 3, 2019

 

A strong M 6.2 earthquake occurred today in the Queen Charlotte Island area of British Columbia, Canada. NEIC reported it was felt with intensity II-III ini British Columbia at Port Hardy, Port MacNeill, Prince Rupert, Terrace, Port Alberni, Nanaimo, Vancouver, Sidney and Victoria, British Columbia. The mainshock of M 6.2 was preceded by a regional foreshock of M 3.9 in southeast Alaska and by a series of moderate earthquakes off the coast of Oregon earlier in the day This appears to be part of the activation of Alaska with the new mon/eclipse which occurred in the past two days and was noted in the previous summary as:

 

 

"A series of moderate earthquakes also hit the region of Alaska today after several weeks of quiet in the region. Four separate epicenters were active with M>=4.7. This is uncommon. The last time for or more events of M>=4.5 hit Alaska within about a day was March 6 through March 7, 2019 when four different epicenters showed activity at this level but has been at least five years when the entire state was activated at this level. That this activation coincided with the year's only total solar eclipse is probably not a coincidence." (July 2-3, 2019)

 

and the tidal forecast associated with the new moon in previous issues:

 

 

"The new moon will arrive on July 2 at 19:16 UT. Longitudinal areas most likely to see high tidal stresses with this event are near 80 East and 100 West. These areas include central Asia in the east and the central U.S. in the West (including the central Plaines states where tidal triggering is common). This new moon will include a solar eclipse. It will be visible over Central Chile and Argentina near 34S 68-75W and into the Pacific Ocean. A strong event in  Central Chile is possible as this eclipse passes. The timing of the eclipse is maximized about 20:00 UT. A strong regional event in this active area could occur in the next four days. While these will experience the maximum tidal stress many other areas could also see enhanced seismicity in the next week." (July 1-2, 2019)

 

Today's M 5.8-6.2 in the Queen Charlotte Island area is the strongest in that region within  about 100 km of today's epicenter since an M 6.2 on April 24, 2015. The last of larger magnitude in the area was an M 7.8 on October 28, 2012, an event associated with landfall of Hurricane Sandy on the New York East coast. Forecast 117268 had expected today's activity was likely around July 4 within about 50 km of the epicenter. The earthquake in British Columbia as well as those off the coast of Oregon are located at 103 degrees from the M 7.3 in the Banda Sea of June 24. Strong triggering can occur at this distance from large events.

 

O:  4JUL2019 04:30:45  51.1N  130.4W Mw=6.2  EMSC   QUEEN CHARLOTTE ISLANDS REGION

O:  4JUL2019 04:30:41  51.2N  130.7W MB=5.8  ECAN Bella Bella, BC                

P:  4JUL2019 117268    50.5N  130.4W 3.0-5.0 AAAAA  British Colombia           

 

A regional foreshock to the M 6.2 occurred to the north in Southeastern Alaska near local solar midnight and was probably promoted by high tidal stresses associated with the New Moon. Only one earthquake with M>=3.9 has occurred within about 200 km of this epicenter in the past year - an M 4.8 on March 9, 2019. Events of M 3.9-4.0 hit the area in June, 2018 and October, 2017. Forecast 117269 had expected today's event within this area was likely in early June.

 

O:  3JUL2019 10:36:03  55.2N  134.5W mb=3.9  EMSC   SOUTHEASTERN ALASKA          

P:  7JUL2019 117269    54.0N  133.0W 3.0-5.1 BBAAA  British Colombia           

 

The activity off the coast of Oregon continued the activation of this region which most recently was associated with an M 5.7 off Northern California. That included two events of M 5.4 on June 21-22, 2019. Forecast 117245 had expected today's activity within about 25 km was likely around July 5.

 

O:  3JUL2019 13:26:39  44.4N  129.0W mb=3.8  EMSC   OFF COAST OF OREGON          

O:  3JUL2019 15:15:19  44.4N  129.1W mb=4.1  EMSC   OFF COAST OF OREGON          

O:  3JUL2019 22:42:35  44.5N  128.8W mb=3.7  EMSC   OFF COAST OF OREGON          

O:  3JUL2019 22:32:31  44.5N  128.9W mb=4.1  EMSC   OFF COAST OF OREGON          

P:  5JUL2019 117245    44.5N  129.8W 3.0-4.5 AAAAA  Off Coast of Oregon         

 

An M 3.2-3.8 in Hawaii followed the earthquake in the Queen Charlotte Islands about 5 minutes later. NEIC reported it was felt with intensity II-III in Hawaii at Hawaii National Park, Volcano, Mountain View, Pahoa, Kurtistown, Hilo, Pahala, Papaikou, Naalehu and Holualoa, Hawaii. This event occurred as p-waves from Canada arrived in Hawaii and may have been triggered. When an M 3.7 hit Hawaii yesterday, this summary noted the relation to Hurricane Barbara as:

 

 

"An M 3.7 also shook Hawaii today. This may have been promoted by stresses from a strong 150 kph Hurricane Barbara current bearing down on Hawaii as well as tidal stresses from the new moon." (July 2-3, 2019)

 

and

 

"Hurricane Barbara continued today east of Hawaii with winds up to 140 kts.  It is expected to track to the west but not to make landfall. Little effect on regional seismicity is anticipated with this storm. An M 3.7 in Hawaii today may be related to this storm which is moving towards landfall in Hawaii around July 9. Seismicity and volcanism in Hawaii is expected to be enhanced while Hurricane Barbara is in the area." (July 2-3, 2019)

 

O:  4JUL2019 04:35:13  19.4N  155.2W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII     

O:  4JUL2019 04:35:13  19.4N  155.2W ML=3.8  ANSS   ISLAND OF HAWAII, HAWAII     

P:  8JUL2019 117109    19.2N  155.2W 3.0-4.5 BAAAA  Hawaii                     

 

In addition to the M 6.2 in British Columbia, the activation of the region of Alaska continued today with an M  4.4 in the Alaska Peninsula and an M 4.7 in Southern Alaska. NEIC reported it was felt with intensity IV in Alaska at Kasilof and II-III in Clam Gulch, Soldotna, Ninilchik, Sterline, Anchor Point, Kenai NTL Park, Cooper Landing and Homer, Alaska. This activity had been expected in forecasts 117285 and 117288.

 

O:  3JUL2019 09:47:39  54.1N  162.5W mb=4.4  EMSC   ALASKA PENINSULA             

P:  5JUL2019 117285    54.5N  163.5W 3.5-5.3 AAAAA  Unimak Islands, Aleutians  

 

O:  3JUL2019 22:29:26  60.3N  151.3W Mw=4.7  EMSC   KENAI PENINSULA, ALASKA       

P:  7JUL2019 117288    60.0N  153.5W 3.2-5.1 BAAAA  Central Alaska             

 

 

 

 

 

NEW MOON ACTIVATES ALASKA AND SOUTHERN HEMISPHERE

 

EARTHQUAKE SUMMARY FOR JULY 2, 2019

 

The largest earthquakes in the world today occurred in the Southern Hemisphere suggesting promotion from the solar eclipse which was confined to that region. These events occurred in the Fiji Islands (M 5.8); South of Australia (M 5.7); the Carlsberg Ridge (M 5.8) and the Santa Cruz Islands (M 5.6).

 

The earthquake of M 5.7 south of Australia was the strongest within about 250 km of that epicenter since an M 7.1 on December 12, 2001. The only other such event in the area in the past 30 years was an M 5.7 on December 25, 2000.  Forecast 117351 had expected this event was likely around July 9.

 

O:  2JUL2019 19:51:47  43.6S  123.6E Mw=5.7  EMSC   SOUTH OF AUSTRALIA            

P:  9JUL2019 117351    49.0S  122.0E 4.0-5.8 CCAAA  So. of Australia           

 

The M 5.8 in the Carlsberg Ridge south of Iran was the strongest within about 200 km of that epicenter since an M 7.6 on July 15, 2003. The only other such quake in the area in the past 30 years was an M 6.0 on January 14, 1998. Forecast 117081 had expected today's event within about 100 km of the epicenter was likely in early July. It is located at 143 degrees from the M 8.0 in Peru of May 26, 2019 and at 144 degrees from the Ecuador M 7.5 of February 22 and was probably promoted by concentrated energy from those sources,

 

O:  2JUL2019 09:44:33   1.6S   67.7E Mw=5.8  EMSC   CARLSBERG RIDGE              

P:  9JUL2019 117081     1.0S   67.0E 4.0-5.6 CAAAA  Indian Ocean                

 

O:  2JUL2019 08:00:17  11.5S  166.3E Mw=5.6  EMSC   SANTA CRUZ ISLANDS           

P: 29JUN2019 117029    13.0S  167.0E 4.0-5.7 BBAAA  Vanuatu Islands            

 

The event in the Fiji area was at 101 degrees from the M 8.0 in Peru of May 25. It was probably promoted by concentrated energy from that source.

 

O:  3JUL2019 03:45:29  22.2S  179.5W Mw=5.8  EMSC   SOUTH OF FIJI ISLANDS        

P:  5JUL2019 117332    21.0S  178.0W 4.0-5.5 AABAA  Tonga Islands              

 

A series of moderate earthquakes also hit the region of Alaska today after several weeks of quiet in the region. Four separate epicenters were active with M>=4.7. This is uncommon. The last time for or more events of M>=4.5 hit Alaska within about a day was March 6 through March 7, 2019 when four different epicenters showed activity at this level but has been at least five years when the entire state was activated at this level. That this activation coincided with the year's only total solar eclipse is probably not a coincidence.   None of the events in northern Alaska were reported felt but the quake in Southern Alaska was.

 

A moderate earthquake of M 4.6 also shook areas of southern Alaska today. NEIC reported this event was felt with intensity II-III in Alaska at Homer, Anchor Point, Ninilchik, Clam Gulch, and Kasilof among others. Forecast 117288 expected this event within about 100 km in early July.

 

O:  2JUL2019 20:39:03  59.1N  152.4W mb=3.9  EMSC   SOUTHERN ALASKA              

O:  2JUL2019 19:30:00  59.3N  152.2W Mw=4.7  EMSC   SOUTHERN ALASKA              

P:  7JUL2019 117288    60.0N  153.5W 3.2-5.1 BAAAA  Central Alaska             

 

O:  2JUL2019 11:33:08  61.7N  150.1W ml=3.2  EMSC   SOUTHERN ALASKA              

P:  7JUL2019 117291    60.6N  151.4W 3.2-5.2 BAAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.2 in  Southern Alaska was felt with intensity II-III in the area(s) of Wasilla, Chugiak, and Anchorage, Alaska.

 

O:  3JUL2019 01:13:20  65.9N  166.2W mb=4.5  EMSC   NORTHERN ALASKA               

 

O:  2JUL2019 18:24:54  66.3N  156.9W ML=3.2  EMSC   NORTHERN ALASKA              

O:  2JUL2019 18:17:07  66.3N  157.1W Mw=4.7  EMSC   NORTHERN ALASKA              

P:  8JUL2019 117297    66.9N  155.8W 3.0-4.7 CAAAA  Northern Alaska            

 

The earthquakes in Northern Alaska including the M 5.3 were located at 103 degrees from the M 7.2 in the Kermadec Islands and were probably promoted by energy from that source.

 

O:  3JUL2019 06:59:35  69.0N  144.8W ml=3.2  EMSC   NORTHERN ALASKA               

O:  3JUL2019 04:58:56  69.1N  144.6W mb=4.5  EMSC   NORTHERN ALASKA              

O:  3JUL2019 05:53:17  69.1N  144.7W ml=3.0  EMSC   NORTHERN ALASKA              

O:  3JUL2019 04:38:24  69.2N  144.8W Mw=5.3  EMSC   NORTHERN ALASKA              

P:  2JUL2019 117296    69.0N  144.0W 3.0-4.8 AAAAA  Northern Alaska            

 

A series of light earthquakes of M 2.0-3.5 occurred north of Los Angeles, California today. NEIC reported these events were felt with intensity II-III in California at Frazier Park, Bakersfield, Tehachapi, Valencia and Moorpark. These events began about local solar noon and were probably promoted by the new moon and solar eclipse. The tidal forecast for this new moon had read:

 

 

"The new moon will arrive on July 2 at 19:16 UT. Longitudinal areas most likely to see high tidal stresses with this event are near 80 East and 100 West. These areas include central Asia in the east and the central U.S. in the West (including the central Plaines states where tidal triggering is common). This new moon will include a solar eclipse. It will be visible over Central Chile and Argentina near 34S 68-75W and into the Pacific Ocean. A strong event in  Central Chile is possible as this eclipse passes. The timing of the eclipse is maximized about 20:00 UT. A strong regional event in this active area could occur in the next four days. While these will experience the maximum tidal stress many other areas could also see enhanced seismicity in the next week." (July 1-2, 2019)

 

The largest of these were M 3.1 and 3.2. The last earthquake within about 75 km of this epicenter with M>=3.2 was an M 3.5 on June 10, 2019 and prior to that an M 3.3 on  April 22, 2019. Forecast 117200 expected activity in this rea around July 5.

 

O: 02JUL2019 22:51:46  35.1N  118.9W Ml=2.0  EMSC   CENTRAL CALIFORNIA

O: 03JUL2019 00:31:18  35.1N  118.9W Ml=2.4  EMSC   CENTRAL CALIFORNIA

O: 02JUL2019 22:12:07  35.1N  118.9W Ml=2.5  EMSC   CENTRAL CALIFORNIA

O: 02JUL2019 22:22:52  35.1N  118.9W Ml=2.6  EMSC   CENTRAL CALIFORNIA

O: 02JUL2019 22:03:21  35.1N  118.9W Ml=2.8  EMSC   CENTRAL CALIFORNIA

O: 02JUL2019 22:21:08  35.1N  118.9W Ml=3.1  EMSC   CENTRAL CALIFORNIA

O: 02JUL2019 22:40:56  35.1N  118.9W Ml=3.2  EMSC   CENTRAL CALIFORNIA

O: 02JUL2019 22:26:31  35.1N  119.0W Ml=2.0  EMSC   CENTRAL CALIFORNIA

O:  2JUL2019 22:42:58  35.0N  118.9W Ml=2.0  EMSC   CENTRAL CALIFORNIA           

P:  5JUL2019 117200    35.6N  118.4W 2.5-4.4 BAAAA  So. California             

 

An M 3.7 also shook Hawaii today. This may have been promoted by stresses from a strong 150 kph Hurricane Barbara current bearing down on Hawaii as well as tidal stresses from the new moon. NEIC reported this earthquake of M 3.7 in Hawaii was felt with intensity II-III in the area(s) of Hawaiii at Volcano, Pahoa, Mountain View, Kurtistown, Hilo, Keaau, Papaikou, Pepeekeo, Honomu and Captain Cook, Hawaii. This is the strongest earthquake in Hawaii since an M 4.2 occurred on April 28, 2019. Forecast 117109 had expected this event within about 25 km was likely in early July, The forecast associated with Hurricane Barbara had read:

 

“Hurricane Barbara continued today Southwest of Baja California with winds up to 165 kts. It is expected to track to the west but not to make landfall. Little effect on regional seismicity is anticipated with this storm. An M 3.7 in Hawaii today may be related to this storm which is moving towards landfall in Hawaii around July 9. Seismicity and volcanism in Hawaii is expected to be enhanced while Hurricane Barbara is in the area.” (July 1-3, 2019)
 

O:  2JUL2019 07:37:15  19.3N  155.2W Ml=3.7  EMSC   ISLAND OF HAWAII, HAWAII     

P:  8JUL2019 117109    19.2N  155.2W 3.0-4.5 CAAAA  Hawaii                     

 

SOLAR ECLIPSE TO BE SEEN IN CENTRAL CHILE

 

EARTHQUAKE SUMMARY FOR JULY 1, 2019

 

A solar eclipse will be seen today in the region of southern Pacific Ocean, West Chile Rise, East Pacific Rise and Central Chile. Solar eclipses have been known to be associated with major events in South America in the past. For example, a total solar eclipse of June 21, 2001 which began over South America was accompanied by  an M 8.4 in Peru on June 23, 2001, a quake which devastated the area and killed thousands. The coincidence of these two events

was probably not happenstance. A further example is the Izmit, Turkey event of August 1999 which coincided with the most complete solar eclipse in Europe in centuries. Because this is a high southern latitude event, other areas at high southern latitudes could also see enhanced seismicity in the next several days.  A moderate earthquake in the La Araucania area of central Chile may be a foreshock to a larger event associated with today's solar eclipse. CSN reported this earthquake was felt with intensity  IV in  La Araucania at Villarrica, Temuco and Padre lsa Casas, Chile. The last earthquake in the La Araucania area of Chile of significantly larger magnitude was an M 4.6 on June 24, 2019. Forecast 117043 expected today's activity at the end of June.

 

O:  2JUL2019 00:48     38.8S   72.6W mb=4.0  GUC    La Araucania at Villarrica, Te

O:  2JUL2019 00:48:11  38.9S   72.6W ML=4.0  EMSC   ARAUCANIA, CHILE             

P: 29JUN2019 117043    39.0S   73.0W 4.0-5.4 AAAAA  Central Chile               

 

The tidal triggering from this new moon is expected as:

 

"The new moon will arrive on July 2 at 19:16 UT. Longitudinal areas most likely to see high tidal stresses with this event are near 80 East and 100 West.

These areas include central Asia in the east and the central U.S. in the West (including the central Plaines states where tidal triggering is common). This new moon will include a solar eclipse. It will be visible over Central Chile and Argentina near 34S 68-75W and into the Pacific Ocean. A strong event in  Central Chile is possible as this eclipse passes. The timing of the eclipse is maximized about 20:00 UT.  A strong regional event in this active area could occur in the next four days. While these will experience the maximum tidal stress many other areas could also see enhanced seismicity in the next week." (July 1-2, 2019)

 

The strongest earthquake in the world today was an M 6.0 in Central Vanuatu. NEIC reported it was felt with intensity IV in Luganville, Vanuatu.

The last earthquake within about 150 km of this epicenter in Vanuatu with M>=6 was an M 6.3 on March 20, 2019 and prior to that an M 6.5 on August 21, 2018. Forecast 117029 had expected this event was likely within about 100 km of this epicentre at the end of June.

 

O:  1JUL2019 17:13:31  15.5S  167.5E Mw=6.0  EMSC   VANUATU                      

P: 27JUN2019 117029    16.0S  168.0E 4.0-5.5 BAAAA  Vanuatu Islands            

 

A strong earthquake also occurred in Northern Mindanao, Philippines with M 5.9. This may be an aftershock of the Bohol earthquake (M 7.6) which hit the area following a strong oceanic storm (Tembin) on August 31. 2012.  Activity in this region was probably promoted by Tropical Storm 04W as noted in previous issues of this summary:

 

"Tropical Storm 04W formed east of Central Philippines today with winds up to 45 kts. This system It could affect seismicity in northern Philippines as it passes through the area." (June 28-29, 2019)

 

Today's event is the strongest within about 150 km of this epicenter since an M March 8, 2019 (M 6.0 and prior to that an M 6.5 on July 6, 2017.   Forecasts 117112 and 116868 had expected this event in late June or early July,

 

O:  1JUL2019 16:59:26   9.2N  124.2E Mw=5.9  EMSC   BOHOL, PHILIPPINES           

P:  3JUL2019 117112    10.0N  125.0E 3.5-5.2 AAAAA  Luzon, Philippines         

P: 29JUN2019 116868    12.0N  124.0E 3.5-4.9 BCAAA  Luzon, Philippines         

 

The most unusual earthquake of the day was an M 3.6 on the South Africa-Swaziland border. NEIC reported it was felt with intensity II in Swaziland at Mbabane and Lobamba, Swaziland. The unusual nature of this earthquake may indicate it was enhanced by tidal stresses associated with the new moon. A similar M 3.6 occurred in Swaziland on July 19, 2018 and prior to that an M 4.4 on May 27, 2012. Forecast 117328 had expected today's  activity in early July. This event occurred near local solar noon and may have been promoted by strong tidal stresses which maximize at this hour. This epicenter is at 102 degrees from the M 8.0 in Peru of May 26 and was probably promoted by concentrated energy from that event.

 

 

O:  1JUL2019 08:28:53  26.4S   30.6E mb=3.6  EMSC   SOUTH AFRICA                 

P:  6JUL2019 117328    26.0S   28.0E 3.0-4.7 BABAA  Rep. South Africa          

 

 

 

 

 

MODERATE QUAKE IN HOKKAIDO, JAPAN

 

EARTHQUAKE SUMMARY FOR JUNE 30, 2019

 

The strongest earthquake in the world today was an M 5.1 in Hokkaido, Japan. NEIC reported this earthquake of M  5.1 in Hokkaido, Japan was felt with intensity II-III in the area(s) of Misawa, Aomori, Japan. The last earthquake of larger magnitude in Hokkaido was an M 5.2 on April 27, 2019. Forecast 116955 had expected today's event within about 25 km of this epicenter was likely around June 27.

 

O:  1JUL2019 00:37:36  41.2N  142.2E Mw=5.1  EMSC   HOKKAIDO, JAPAN REGION       

P: 27JUN2019 116955    41.0N  142.0E 3.5-5.6 BAAAA  Hokkaido, Japan            

 

The largest earthquake in the U.S. or Canada outside Alaska today was an M 4.2 in eastern Nevada. NEIC reported it was felt with intensity IV in Pioche, Nevada and II-III in Caliente, and in Utah at Beryl, Saint George, Veyoand Danneron Valley.

This is the strongest earthquake in this area within about 75 km of the epicenter since an M 4.3 about 50 km northeast of this on January 15, 2016. A moderate quake af M 5.3 about 50 km southwest of today's occurred on May 22, 2105. Today's event was preceded by an M 3.8 in Arizona yesterday. This summary noted at the time:

 

 

"The strongest earthquake in the U.S. or Canada outside Alaska today was an M 3.8 in Arizona. It was reported by NEIC to have been felt with intensity II-III in Nevada at Mesquite and Overton and in Arizona at Flagstaff and Litchfield Park. The last earthquake within about 100 km of this epicenter on the Arizona-Nevada border with M>=3.8 was an M 3.8 on January 16, 2019. The last of larger magnitude was an M 4.3 on January 15, 2016.  Forecast 116946 had expected regional activity at the end of June. This epicenter is located at 90 degrees (node 4) from the Kermadec Islands and at the seventh node (51.5 degrees) from the quake in Ecuador of February 22 and was probably promoted by energy from those sources." (June 30, 2019) Forecasts 116899 and 116946 had expected regional activity at the end of June.

 

This epicenter is located at 90 degrees from the M 7.2 in the Kermadec Islands of June 15 of May 26 and was probably promoted from that source

 

O: 30JUN2019 23:43:36  37.8N  114.3W ML=4.2  EMSC   NEVADA                       

O:  1JUL2019 00:03:42  37.8N  114.3W ml=2.2  EMSC   NEVADA                       

O:  1JUL2019 06:23:07  37.8N  114.3W ml=2.3  EMSC   NEVADA                       

P: 23JUN2019 116899    38.7N  115.4W 2.5-4.4 CAAAA  California/Nevada area     

P: 29JUN2019 116946    39.8N  112.7W 2.0-3.9 ABBAA  Utah area                  

 

The strongest earthquake in Alaska today was an M 4.8 in the central Andreanof Islands, Aleutians. It was not reported felt in this epicentral area.  The last earthquake of M>=4.8 within about 100 km of this epicenter was an M 6.1 on May 23, 2019 But the last less than 100 km away was an M 5.0 on February 15, 2019. Forecast 116986 expected today's event in this region around June 28. This epicenter is located at 103 degrees from the M 8.0 in Peru of May 26 and was probably promoted from that source.

 

O: 30JUN2019 14:21:39  51.4N  177.0W mb=4.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 28JUN2019 116986    50.9N  179.0W 3.5-5.3 AABAA  Andreanoff Isls, Aleutians 

 

TAIWAN ROCKS TO M 5.7 EARTHQUAKE

 

EARTHQUAKE SUMMARY FOR JUNE 29, 2019

 

The strongest earthquake in the world today was an M 5.2-5.7 in the area southeast of Taiwan. It followed an M 4.8 north of the island.  NEIC reported this earthquake of M 5.2 in Taiwan was felt with intensity II-III in the area(s) of Taipei and Taichung, Taiwan. CWB reported this earthquake of M 4.8 was felt with intensity II in Yilan and I in Taipei, Taoyuan, Hsinchu, Hualien, Miaoli, Taichung and NNantou Counties, Taiwan. The M 5.7 was felt with intensity III in Taitung; II in Hualien, Pingtung, Chiayi, Yunlin, Taichung, Changhua and I in Kaohsiung, Nantou, Tainan, Yilan, Chiayi, Miaoli, Hsinchu and Taipei Counties, Taiwan. The last earthquake of stronger magnitude in Taiwan was an M 6.1 on April 18, 2019 and prior to that an M 5.7 on October 23, 2018 and November 25, 2018.  This may be associated  with Tropical Storm 04W which is in the area and is due to pass near Taiwan in several days. Early in the Typhoon/Hurricane season while strains have not yet been released due to induced plate motion associated with ocean storms, triggering can be very active as was the case in the Mariana Is. M 6.4 yesterday, a series in Mindanao, Philippines today and this event in Taiwan. This is expected to continue for several more weeks.

 

"A tropical cyclone may be forming east of Central Philippines. This system is currently located at 12N 134E with winds up to 25 kts and moving to the NNW. It could affect seismicity in northern Philippines as it passes through the area." (June 26, 27, 2019)

 

Forecasts 116892 and 116893 had expected today's activity around June 27-29.

 

O: 29JUN2019 19:44:10  22.3N  122.5E Mw=5.2  EMSC   TAIWAN REGION                

O: 29JUN2019 19:44:12  22.3N  122.4E ML=5.7  TAI    Hualien, Taiwan              

P: 29JUN2019 116893    24.0N  123.0E 4.0-5.4 AAAAA  Taiwan                     

P: 27JUN2019 116892    23.0N  121.0E 4.0-5.6 AAAAA  Taiwan                     

 

O: 29JUN2019 16:20:05  25.1N  122.3E mb=4.6  EMSC   TAIWAN REGION                

O: 29JUN2019 16:20:06  25.0N  122.2E ML=4.8  TAI    Hualien, Taiwan              

P: 29JUN2019 116893    24.0N  123.0E 4.0-5.4 ABAAA  Taiwan                     

 

A series of three moderate earthquakes also occurred today in the Ascension Island region of the Central Atlantic. These were not felt in this remote epicentral area. The last earthquake of larger magnitude in this region within about 200 km  of this epicenter was an M 5.7 on November 27, 2018 and prior to that an M 6.6 on August 18, 2017. Forecast 116849 had expected this activity was likely within about 50 km of the epicenters around June 28. These events are located at 144 degrees from the Kermadec Islands and were probably promoted by concentrated energy from that source.

 

 

O: 29JUN2019 19:59:24   1.5S   12.4W mb=4.9  EMSC   NORTH OF ASCENSION ISLAND    

O: 29JUN2019 23:03:07   1.8S   13.0W mb=4.9  EMSC   NORTH OF ASCENSION ISLAND    

O: 29JUN2019 19:51:20   1.8S   13.0W mb=5.0  EMSC   NORTH OF ASCENSION ISLAND    

P: 28JUN2019 116849     2.0S   13.0W 4.0-5.5 AAAAA  No. of Ascension Isl       

 

The strongest earthquake in the U.S. or Canada outside Alaska today was an M 3.8 in Arizona. It was reported by NEIC to have been felt with intensity II-III in Nevada at Mesquite and Overton and in Arizona at Flagstaff and Litchfield Park.

The last earthquake within about 100 km of this epicenter on the Arizona-Nevada border with M>=3.8 was an M 3.8 on January 16, 2019. The last of larger magnitude was an M 4.3 on January 15, 2016. Forecast 116946 had expected regional activity at the end of June. This epicenter is located at 90 degrees (node 4) from the Kermadec Islands and at the seventh node (51.5 degrees) from the quake in Ecuador of February 22 and was probably promoted by energy from those sources.

 

O: 29JUN2019 09:07:46  36.4N  113.8W Mw=3.5  EMSC   ARIZONA                      

O: 29JUN2019 07:58:59  36.4N  113.8W Mw=3.8  EMSC   ARIZONA                      

P: 21JUN2019 116946    38.7N  112.6W 2.0-3.9 CBAAA  Utah area                   

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in the Andreanof Islands, Alaska. It was not reported felt in this remote area. This may be an outer rise event as it occurred at the southern boundary of the subduction zone at shallow depth,. Outer rise quakes can signal upcoming activity at deeper focus in this region of the subduction zone. The last earthquake in this area within about 100 km of today's epicenter with M>=4.3 occurred more than a year ago on March 11, 2018 with M 4.4 and prior to that as a swam on May 8-9, 2017 with maximum event M 5.9.  Forecast 116986 had expected today's activity at the end of June. This epicenter is at 103 degrees from the M 8.0 in Peru of May 26 and was probably promoted by concentrated energy from that source.

 

O: 30JUN2019 01:42:24  50.2N  176.9W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24JUN2019 116986    51.7N  176.4W 3.5-5.3 CBAAA  Andreanoff Isls, Aleutians 

 

The seismic swarm in Albania continued today with maximum magnitude up to M 4.7. NEIC reported this earthquake of M 4.7 in Albania was felt with intensity IV in the area(s) of Korce, Albania.  This began yesterday and was discussed in this summary in the previous issue as:

 

 

"A series of minor earthquakes shook Albania today. The largest of these was an M 3.9. No damage was reported with these events. These are aftershocks of the M 5.1 and 5.0 of June 1. Further activity of moderate magnitude is likely with the current swarm in the next several days. Forecast 116976 had expected this activity within about 50 km of the epicenter was likely around June 25." (June 29, 2019)

 

O: 29JUN2019 13:01:17  40.5N   20.8E mb=4.7  EMSC   ALBANIA                      

P: 25JUN2019 116976    40.0N   21.0E 3.0-5.4 BAAAA  Romania/NW Turkey          

 

A pair of moderate earthquakes also occurred today in the Puerto Rico and Dominican Republic areas with M 4.0-4.2 and 4.4-4.5 respectively. These continue enhanced  activity in the area which may lead to a larger event. Forecasts 116877 and 116881 had expected this activity within about 50 km at the end of June.

 

NEIC reported the earthquake of M 4.0 in Puerto Rico was felt with intensity II-III in the area(s) of Punta Santiago, Puerto Rico.

 

NEIC reported the earthquake of M 4.5 in The Dominican Republic was felt with intensity II-III in the area(s) of Hato Mayor, Dominican Republic.

 

O: 30JUN2019 06:37:53  18.5N   68.8W mb=4.2  EMSC   DOMINICAN REPUBLIC           

O: 30JUN2019 06:37:53  18.5N   68.8W mb=4.0  ANSS   DOMINICAN REPUBLIC            

P: 30JUN2019 116877    18.0N   68.0W 3.4-4.9 AAAAA  Puerto Rico                

 

O: 29JUN2019 21:28:04  18.9N   64.4W Md=3.4  EMSC   VIRGIN ISLANDS REGION        

O: 30JUN2019 01:50:45  19.1N   65.3W mb=4.4  EMSC   PUERTO RICO REGION            

O: 30JUN2019 01:50:45  19.1N   65.3W mb=4.5  ANSS   PUERTO RICO REGION           

P: 25JUN2019 116881    20.0N   65.0W 3.0-4.4 BAAAA  Bahamas/No. Caribbean      

 

 

 

 

 

STRONG QUAKE BENEATH NORTHERN MARIANA ISLANDS

 

EARTHQUAKE SUMMARY FOR JUNE 28, 2019

 

The strongest earthquake in the world today was abn M 6.4 in the Northern Mariana Islands. It was not reported felt in this remote area. It may have been promoted by stresses from Tropical Storm 04W.  Seismicity with this storm had been expected to be enhanced in this summary in previous issues as:

 

"A tropical cyclone may be forming east of Central Philippines. This system is currently located at 12N 134E with winds up to 25 kts and moving to the NNW. It could affect seismicity in northern Philippines as it passes through the area." (June 26, 27, 2019)

 

The last earthquake of M>=6.4 in northern Mariana Islands was an M 7.7 about 200 South of today's epicenter but the last within about 150 km, and the only such event in the area in the past 30 years was an M 6.5 on January 30, 2007. Forecast 116894 had expected regional activity around June 27.

 

O: 28JUN2019 15:51:33  19.9N  144.4E Mw=6.4  EMSC   MAUG ISLANDS REG, N. MARIANA I

P: 27JUN2019 116894    22.0N  143.0E 4.0-5.5 ACAAA  Volcano Islands            

 

A moderately strong earthquake also occurred north of Vanuatu in the Santa Cruz Islands with M 5.6. This is the strongest earthquake in the Santa Cruz Islands within about 150 km of this epicenter since an M 5.7 on January 26, 2019 and  a similar M 5.8 on June 19, 2019. Forecast 117029 had expected today's event was likely within about 100 km of this epicenter at the end of June.

 

O: 28JUN2019 18:14:30  12.7S  166.0E Mw=5.6  EMSC   SANTA CRUZ ISLANDS           

P: 29JUN2019 117029    13.0S  167.0E 4.0-5.7 AAAAA  Vanuatu Islands            

 

A series of minor earthquakes shook Albania today. The largest of these was an M 3.9. No damage was reported with these events. These are aftershocks of the M 5.1 and 5.0 of June 1. Further activity of moderate magnitude is likely with the current swarm in the next several days. Forecast 116976 had expected this activity within about 50 km of the epicenter was likely around June 25.

 

O: 28JUN2019 20:09:55  40.5N   20.8E ML=3.7  EMSC   ALBANIA                      

O: 28JUN2019 14:36:37  40.5N   20.8E ML=3.9  EMSC   ALBANIA                      

P: 25JUN2019 116976    40.0N   21.0E 3.0-5.4 BAAAA  Romania/NW Turkey          

 

STRONG AFTERSHOCK IN KERMADEC ISLANDS, NEW ZELAND

 

EARTHQUAKE SUMMARY FOR JUNE 27, 2019

 

The strongest earthquake in the world today was an M 6.3 in the aftershock zone of of M 7.2 of June 15. This is one of the largest aftershocks in the area to date. Forecast 117047 had expected aftershock activity would continue in this area.

 

O: 27JUN2019 11:04:56  30.3S  179.2W Mw=6.3  EMSC   KERMADEC ISLANDS REGION      

P: 28JUN2019 117047    30.0S  178.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

The strongest earthquake today in the U.S. or Alaska was an M 3.9 in the Fox Creek, Alberta area of western Canada. This is the strongest earthquake within about 200 km of this epicenter in Alberta since an M 4.2 on January 12, 2016. In the past 30 years three other  events of M>-3.9 hit the region on June 13, 2016 (M 4.0; an M 4.0 on June 10, 1997 and and M 42 on March 31, 1997 all about 200 km to the southeast of today's epicenter. Forecast 118985 had expected regional seismicity was likely around June 24 to the northwest.

 

O: 27JUN2019 19:51:53  54.5N  117.1W MB=3.9  ECAN Fox Creek, AB                  

P: 24JUN2019 116985    56.0N  120.0W 2.0-4.1 BABAA  Alberta                    

 

The most unusual earthquake of the day occurred as n M 4.1 in Queensland, Australia. It was not reported felt. It is the strongest quake within about 250 km of this epicenter since an M 5.7 on August 18, 2016. Similar but smaller evets  occurred in the region on three other occasions in the past 30 years. This earthquake is located at 101 degrees from the Kermadec Islands and was probably promoted by concentrated energy from that region.

 

O: 28JUN2019 06:16:55  19.7S  148.9E ML=4.1  EMSC   QUEENSLAND, AUSTRALIA        

 

MODERATE AFTERSHOCKS DOMINATE GLOBAL SEISMICITY

 

EARTHQUAKE SUMMARY FOR JUNE 26, 2019

 

It was a relatively quiet day in global seismicity today. The strongest earthquakes occurred as moderate aftershocks. The strongest of these was an M 5.7 in the Komandorsky/Kamchatka area of Russia, but moderate aftershocks also occurred in the Kermadec Islands, the Banda Sea and Papua, New Guinea. This follows an unusually active week in which a series of strong earthquakes occurred in the Kermadec Islands, Papua, Panama, the Komandorsky Islands, and the Banda Sea. This is unusual activity for the end of June. Global seismicity is often at low levels at this time of year through early July. This may be due to the lack of strong oceanic storms during this season in both hemispheres. These storms can induce plate motions which result in strong earthquakes. The northern hemisphere begins to see typhoon and hurricane season beginning in mid-July and lasting through October. The most likely induced seismicity associated with landfall from these storms occurs at mid-latitudes. In the current case there are no major storms nor geomagnetic effects and the new moon does not arrive until early July, so seismicity is likely to remain relatively quiet for the next week. The earthquakes in the Komandorsky Islands today were:

 

 

O: 26JUN2019 10:42:57  56.2N  164.1E mb=4.3  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 26JUN2019 07:02:35  56.2N  164.1E mb=4.6  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 27JUN2019 04:20:48  56.2N  164.3E Mw=5.7  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 26JUN2019 10:57:21  56.2N  164.5E mb=4.6  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 26JUN2019 11:02:16  56.2N  164.6E mb=4.2  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 27JUN2019 06:02:42  56.2N  164.7E mb=4.1  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 26JUN2019 12:36:38  56.3N  164.2E mb=4.3  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 26JUN2019 11:06:55  56.3N  164.7E mb=4.4  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 26JUN2019 14:23:33  56.2N  164.0E mb=4.4  EMSC   KOMANDORSKIYE OSTROVA REGION 

P: 28JUN2019 116991    56.0N  166.0E 4.0-5.6 AABAA  Komandorsky Isl            

 

The second largest earthquake in the world following the M 5.7 in the Komandorsky Islands was an M 5.3 aftershock in the Kermadec Islands, New Zealand. This area has seen nearly daily strong aftershocks since the M 7.2 of June 15 and these may continue for several more days.

 

O: 26JUN2019 18:06:29  31.0S  177.4W Mw=5.3  EMSC   KERMADEC ISLANDS REGION      

P: 25JUN2019 117050    31.0S  177.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

 

Aftershocks in Papua and the Banda Sea were still plentiful but of smaller magnitude than in previous days.

 

O: 26JUN2019 10:38:58   3.0S  137.0E ML=4.5  EMSC   PAPUA, INDONESIA             

O: 26JUN2019 10:36:20   2.5S  138.6E ML=4.3  EMSC   PAPUA, INDONESIA

O: 27JUN2019 03:00:01   2.5S  138.6E ML=4.3  EMSC   PAPUA, INDONESIA

O: 26JUN2019 17:47:31   2.5S  138.7E ML=4.4  EMSC   PAPUA, INDONESIA

P: 24JUN2019 116858     2.0S  138.0E 4.0-5.4 AAAAA  West Irian, PNG            

P: 27JUN2019 116859     2.0S  138.0E 4.0-5.4 AAAAA  West Irian, PNG            

 

O: 27JUN2019 05:46:22   6.3S  125.1E mb=4.6  EMSC   BANDA SEA                    

O: 26JUN2019 07:10:29   7.2S  123.3E mb=4.3  EMSC   BANDA SEA                    

P: 21JUN2019 116843     8.0S  124.0E 4.0-5.4 BAAAA  Flores Island area         

 

KERMADEC ISLAMDS CONTINUE TO PROMOTE GLOBAL SEISMICITY

 

EARTHQUAKE SUMMARY FOR JUNE 25, 2019

 

Enhanced seismicity continued at distances from the Kermadec Islands, New Zealand today where energy was concentrated near the surface after those events. These included two strong M 6.3-6.4 events at the fourth node (90 degrees) from the  Kermadecs and an M 6.3-6.4 in Panama near 100 degrees from the Kermadec Islands.

 

The strongest earthquake widely felt in the world today was an M 6.2-6.3 on the  Panama-Costa Rica border. NEIC reported maximum intensity IX (damage) at Aserrio de Ganche, Panama and VIII in Finca Blanco, Panama. Intensity VI was reported from Panama at Sortova,; VI at Puerto Armuelles, and V in Ganche, La Concepcion, Guarumal, David, Los Algarrobos and Monte Line Chiriqui. It was also reported with moderate intensity in Costa Rica and Jamaica. The M 6.2 occurred within about 10 minutes of local solar midnight, and was probably promoted by strong tidal stresses which maximize at this hour.

This is the strongest earthquake within about 200 km of this epicenter in Panama since an M 6.6 on December 8, 2014. Forecast 116831 gad expected today's activity was likely within about 50 km of this epicenter around June 27. This epicenter is located at 144 degrees from the Banda Sea and may have been promoted from that source.

 

O: 26JUN2019 05:33:30   8.3N   82.8W ML=4.0  EMSC   PANAMA-COSTA RICA BORDER REGION

O: 26JUN2019 05:39:30   8.3N   82.9W ML=4.2  EMSC   PANAMA-COSTA RICA BORDER REGION

O: 26JUN2019 05:41:30   8.3N   82.9W ML=4.4  EMSC   PANAMA-COSTA RICA BORDER REGION

O: 26JUN2019 05:23:51   8.4N   82.8W Mw=6.2  EMSC   PANAMA-COSTA RICA BORDER REGIO

P: 27JUN2019 116831     9.0N   83.0W 3.5-5.0 AAAAA  Costa Rica                 

 

A pair of earthquakes of M 6.2-6.4 also occurred today in the Komandorsky Islands, Russia. NEIC reported they were lightly felt in Kamchatka, Russia. The last earthquake of M>=6.4 within about 250 km of this epicenter was an M 7.3 on December 20, 2018 and prior to that an M 6.6 on March 29, 2017 after a four year quiet period since 2013. Today's epicenters are located at the fourth node (90 degrees) from the recent strong activity in the Kermadec Islands and were at the sixth node from the M 7.5 in New Britain of May 14 and was probably promoted from those sources. Forecast 116991 had expected today's activity within about 100 km was likely around June 28.

 

O: 26JUN2019 05:15:24  55.7N  164.2E mb=4.7  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 26JUN2019 05:17:06  55.7N  164.2E mb=4.8  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 26JUN2019 03:50:56  55.9N  164.4E mb=4.5  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 26JUN2019 02:18:07  56.2N  164.1E Mw=6.4  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 25JUN2019 09:05:40  56.2N  164.3E Mw=6.3  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 26JUN2019 05:53:32  56.2N  164.6E mb=4.5  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 25JUN2019 15:59:44  56.3N  163.8E mb=4.7  EMSC   NEAR EAST COAST OF KAMCHATKA

O: 26JUN2019 02:44:27  56.3N  164.0E mb=4.6  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 28JUN2019 116991    56.0N  166.0E 4.0-5.6 AAAAA  Komandorsky Isl            

 

The strongest earthquake in the U.S. or Canada today was another in the series of moderate quakes off the coast of Oregon. This event was located at the fourth node (90 degrees) from the Kermadec Islands and like other events today was probably promoted from that source. Forecast 116772 expected today's event around June 26. This activity is located at 104 degrees from the Banda Sea and may have been promoted by the M 7.3 in that area of June 24.

 

O: 26JUN2019 00:29:51  43.4N  127.2W mb=4.1  EMSC   OFF COAST OF OREGON          

P: 26JUN2019 116972    41.8N  126.9W 2.5-4.4 ABAAA  Off Coast of No. Calif     

 

OCEAN FLOORS ACTIVE; POSSIBLE TIDAL PROMOTION

 

EARTHQUAKE SUMMARY FOR JUNE 24, 2019

 

The strongest activity in the world today occurred along ocean ridges. These included an M 5.8 in the Southeast Indian Ridge; an M 5.5 in the South Sandwich Islands and two unusual events of M 4.5 in Iceland. The M 5.8 in the Indian Ridge and the M 4.5's in Iceland occurred within an hour of local solar noon and may have been promoted by strong tidal stresses which maximize at this hour.

 

The strongest earthquake today was the M 5.8 in the Southeast Indian Ridge. It was not reported felt in this remote epicentral area. The antipode is in Ontario, Canada near a series of light to moderate quakes in Ohio last week. The last earthquake within about 250 km of today's epicenter with M>=5.8 occurred February 5, 2010 and prior to that an M 5.8 on April 9, 2005. Forecast 117053 expected today's event in this area around June 26.

 

 

O: 25JUN2019 06:01:48  48.0S   99.6E Mw=5.8  EMSC   SOUTHEAST INDIAN RIDGE       

P: 26JUN2019 117053    46.0S   96.0E 4.0-5.6 ABBAA  So. Indian Ocean           

 

The M 5.5 in the South Sandwich Islands occurred southeast of the recent activity in that region. It was not reported felt. It may be an aftershock of an M 6.5 of April 9, 2019 which in turn was an aftershock of an M 7.1 on December 11, 2018. Forecast 117058 had expected today's event within about 100 km of the epicenter was likely around June 24.

 

O: 24JUN2019 19:21:36  58.1S   25.4W Mw=5.5  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 24JUN2019 117058    59.0S   26.0W 4.0-6.0 AAAAA  So. Sandwich Islands       

 

Two moderate earthquakes of M 4.5 and 4.6 occurred today in the region of northern Iceland. They were lightly felt. The first of these occurred within five minutes of local solar noon and was probably promoted by strong tidal stresses which maximize at this hour. The last earthquake in Iceland within about 250 km of this epicenter with M>=4.5 occurred on February 23, 2019 also with M 4.5. The last of larger magnitude in the area was an M 4.7 on December 28, 2018.  Forecasts 116773 and 117009 had expected this activity between June 17 and 26. This activity is at the third node (120 degrees) from the M 7.5 in New Britain of May 14 and may have been promoted by energy from that source.

 

O: 24JUN2019 13:55:59  64.6N   17.7W mb=4.5  EMSC   ICELAND                      

O: 24JUN2019 13:18:14  64.7N   17.4W ML=3.4  EMSC   ICELAND                      

O: 24JUN2019 13:09:09  64.7N   17.8W mb=4.5  EMSC   ICELAND                      

P: 17JUN2019 116773    65.0N   17.0W 3.0-4.4 CAAAA  Iceland area               

P: 26JUN2019 117009    66.0N   17.0W 3.0-4.4 ABAAA  Iceland area               

 

A moderately strong earthquake of M 5.9 also hit the Kermadec Islands aftershock zone today. An M 7.2 hit this area on June 15, 2019 and strong aftershocks have occurred almost daily since then. Forecast 117050 had expected today's event was likely within about 50 km of this epicenter around June 25.

 

O: 24JUN2019 11:34:08  30.9S  177.4W Mw=5.9  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 25JUN2019 117050    31.0S  177.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

 

An M 5.7 also occurred in the aftershock swarm in Papua, Indonesia today. This was accompanied by at least 20 other moderate earthquakes. They are being felt lightly in the area and in Northern Territory, Australia. Forecast 116860 had expected this activity to continue through June 27.

 

O: 24JUN2019 07:38:12   2.1S  139.0E ML=4.0  EMSC   PAPUA, INDONESIA

O: 24JUN2019 21:28:12   2.2S  138.8E ML=4.1  EMSC   PAPUA, INDONESIA

O: 24JUN2019 19:05:57   2.4S  138.6E ML=4.4  EMSC   PAPUA, INDONESIA

O: 24JUN2019 20:15:39   2.4S  138.7E ML=4.2  EMSC   PAPUA, INDONESIA

O: 25JUN2019 05:23:15   2.4S  138.7E ML=4.2  EMSC   PAPUA, INDONESIA

O: 24JUN2019 18:10:30   2.5S  138.5E ML=4.0  EMSC   PAPUA, INDONESIA

O: 24JUN2019 10:42:53   2.5S  138.6E ML=4.0  EMSC   PAPUA, INDONESIA

O: 24JUN2019 21:36:09   2.5S  138.6E ML=4.2  EMSC   PAPUA, INDONESIA

O: 24JUN2019 17:05:31   2.5S  138.6E ML=4.3  EMSC   PAPUA, INDONESIA

O: 24JUN2019 20:51:10   2.5S  138.7E ML=4.4  EMSC   PAPUA, INDONESIA

O: 24JUN2019 21:08:18   2.6S  138.6E ML=4.1  EMSC   PAPUA, INDONESIA

O: 24JUN2019 22:13:18   2.6S  138.6E ML=4.2  EMSC   PAPUA, INDONESIA

O: 24JUN2019 17:52:58   2.6S  138.6E ML=4.3  EMSC   PAPUA, INDONESIA

O: 24JUN2019 22:39:44   2.6S  138.6E mb=5.0  EMSC   PAPUA, INDONESIA

O: 24JUN2019 17:35:13   2.7S  138.5E Mw=5.3  EMSC   PAPUA, INDONESIA

O: 24JUN2019 09:56:46   2.7S  138.5E mb=4.8  EMSC   PAPUA, INDONESIA

O: 24JUN2019 16:53:19   2.7S  138.5E mb=5.7  EMSC   PAPUA, INDONESIA

O: 24JUN2019 10:17:35   2.7S  138.6E mb=4.7  EMSC   PAPUA, INDONESIA

O: 24JUN2019 07:19:45   2.7S  138.6E mb=5.0  EMSC   PAPUA, INDONESIA

O: 24JUN2019 20:35:18   2.7S  138.7E ML=4.0  EMSC   PAPUA, INDONESIA

O: 24JUN2019 07:11:53   4.4S  130.9E ML=4.1  EMSC   BANDA SEA                    

O: 24JUN2019 09:37:02   6.4S  129.2E ML=5.0  EMSC   BANDA SEA                    

O: 24JUN2019 23:47:02   6.5S  129.2E ML=4.6  EMSC   BANDA SEA                    

P: 27JUN2019 116860     6.0S  130.0E 4.0-5.4 AAAAA  West Irian, PNG            

 

STRONG EARTHQUAKES IN EASTERN INDONESIA

 

EARTHQUAKE SUMMARY FOR JUNE 23, 2019

 

The strongest earthquake in the world today was an M 7.3 in the Banda Sea, Indonesia. NEIC reported it was felt with intensity IV in Maluku, East Timor, Dili Dili, Same Manufahi, Oecussi, Timor and in Northern Territory, Australia at Coonawarram Nguiu. This follows a series including an M 6.3 in Papua New Guinea. Some of these were reported felt with light intensity in Darwin, Northern Territory, Australia, but the felt reports probably were associated with the Banda Sea event. The event in the Banda Sea is at 101-106 degrees from the  M 5.6 off the coast of California about a day earlier. Seismic energy is concentrated at the surface at this distance from large earthquakes and can help promote seismicity in this distance range.

 

The last moderately large quake in the Banda Sea was an M 5.7 on June 14, possibly a foreshock to today's M 7.3. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 5.6-5.7 in the Banda Sea of Indonesia. NEIC reported it was felt in Northern Territory, Australia with intensity II-III in Coonawarra, Darwin, Howard Springs and Humpty Doo-MacMinns Lagoon, Northern Territory, Australia. Moderate to strong deep focus earthquakes in the Banda Sea are often felt lightly  in the Northern Territory of Australia.   The last earthquake of larger magnitude within about 200 km of this epicenter occurred more than a year ago as an M 6.4 on March 25, 2018, Forecast 116641 expected today's event was likely around June 15.

 

When the event occurred on March 25, 2018, this summary noted the felt area as:

 

"The M 6.6 was reported by NEIC to have been felt with intensity III in East Timor at Baucau and Dili and in Northern Territory, Australia with III-IV in Coonawarra, Palmerston, Darwin, Howard Springs, Humpty-Doo-MacMinns Lagoo, Maningrida, and Katherine and in Kununurra, Wester Australia. BMG reported it was felt in Indonesia with intensity III-IV in Saumlaki; III in Sorong and Kaimana, Maluku, Indonesia. The regional foreshock of M 5.6 was also reported felt with intensity II-III in  Northern Territory, Australia at Coonawarra, Darwin and Humpty Doo-MacMinns Lagoon. Earthquakes in the Banda Sea often shake northern Australia due to local conditions and the deep focus of the Banda Sea events." (March 26, 2018, June 15, 2019)

 

The last major earthquake in the Banda Sea occurred on January 27, 2006 with M 7.5 about 250 km to the northwest of today's epicenter. The only such event within about 150 km of today's event in the past 30 years was an M 73 on December 20, 1992.

Forecast 116623 had expected today’s event within about 50 km of this epicenter was likely around June 19.

 

O: 24JUN2019 03:28:26   6.4S  129.2E mb=5.2  EMSC   BANDA SEA

O: 24JUN2019 04:26:59   6.5S  129.3E ML=4.7  EMSC   BANDA SEA

O: 24JUN2019 02:53:40   6.4S  129.2E Mw=7.3  EMSC   BANDA SEA                    

O: 24JUN2019 02:53:39   6.5S  129.3E Mw=7.7  BMG    BANDA SEA                    

P: 19JUN2019 116623     6.0S  129.0E 4.0-5.4 BAAAA  Banda Sea                  

 

The activity in West Irian (Papua New Guinea) today included an M 5.6 and an M 6.1 but was interrupted by the M 7.3 in the Banda Sea and did not immediately continue.The last event of larger magnitude in the area was an M 6.3 on June 19, 2019.

At the time this summary noted in this regard:

 

 

"The second strongest earthquake in the world today was an M 6.3 in New Guieea, Indonesia. NEIC reported it was felt with intensity IV in Jaya Pura, Papua New Guinea, Indonesia. This is the strongest earthquake within about 200 km of this epicenter since an M 7.0 on July 27, 2015 and a similar M 7.0 on April 6, 2013.  Forecast 116640 expected today's event to the south was likely in mid-June. This epicenter is at 145 degrees from the M 8.0 in Peru of May 26 and the M 7.5 in Ecuador of February 22, 2019. Seismic energy concentrates on the surface at this distance from large mainshock and

can help promote additional seismicity at this distance. It is also located at the seventh node (51 degrees) from the Kermadec Islands." (June 20, 2019)

 

Forecasts 116858 and 116859 had expected today's activity within about  50 km was likely around June 24.

 

O: 24JUN2019 04:57:01   2.5S  138.5E ML=4.2  EMSC   PAPUA, INDONESIA

O: 24JUN2019 05:22:42   2.5S  138.6E ML=4.1  EMSC   PAPUA, INDONESIA

O: 24JUN2019 06:05:35   2.5S  138.7E ML=4.1  EMSC   PAPUA, INDONESIA

O: 24JUN2019 02:42:25   2.6S  138.5E ML=4.5  EMSC   PAPUA, INDONESIA

O: 24JUN2019 04:47:06   2.6S  138.5E mb=5.6  EMSC   PAPUA, INDONESIA

O: 24JUN2019 05:53:10   2.6S  138.6E ML=4.1  EMSC   PAPUA, INDONESIA

O: 24JUN2019 05:40:26   2.6S  138.6E ML=4.5  EMSC   PAPUA, INDONESIA

O: 24JUN2019 02:48:10   2.6S  138.6E mb=5.1  EMSC   PAPUA, INDONESIA

O: 24JUN2019 02:16:27   2.7S  138.3E ML=4.4  EMSC   PAPUA, INDONESIA

O: 24JUN2019 02:26:54   2.7S  138.5E mb=4.7  EMSC   PAPUA, INDONESIA

O: 24JUN2019 05:15:48   2.7S  138.5E mb=5.3  EMSC   PAPUA, INDONESIA

O: 24JUN2019 06:27:12   2.7S  138.6E ML=4.5  EMSC   PAPUA, INDONESIA

O: 24JUN2019 01:05:29   2.7S  138.6E Mw=6.1  EMSC   PAPUA, INDONESIA

O: 24JUN2019 01:45:42   2.7S  138.6E mb=4.7  EMSC   PAPUA, INDONESIA

O: 24JUN2019 01:22:46   2.7S  138.6E mb=5.0  EMSC   PAPUA, INDONESIA

O: 24JUN2019 01:28:35   2.7S  138.6E mb=5.3  EMSC   PAPUA, INDONESIA

O: 24JUN2019 02:03:11   2.7S  138.7E mb=4.7  EMSC   PAPUA, INDONESIA

O: 24JUN2019 02:43:59   2.8S  138.5E mb=5.3  EMSC   PAPUA, INDONESIA

O: 23JUN2019 07:04:03   3.0S  139.9E mb=4.6  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O: 24JUN2019 04:45:43   2.4S  138.6E ML=4.6  EMSC   PAPUA, INDONESIA             

P: 24JUN2019 116858     2.0S  138.0E 4.0-5.4 AAAAA  West Irian, PNG            

P: 27JUN2019 116859     2.0S  138.0E 4.0-5.4 AAAAA  West Irian, PNG            

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 off the coast of Northern California.  NEIC reported this earthquake of M 3.9 off the coast of northern California  was felt with intensity II-III in the area(s) of Ferndale, Petrolia, Loleta, Rio Dell, Fortuna, Scotia, Eureka, and Whitethorn, California. This is an aftershock of the M 5.6 which occurred in this area yesterday.Forecast 116971 had expected today's event was likely within about 50 km

of the epicenter around June 23.

 

 

O: 23JUN2019 22:39:10  40.4N  124.8W Mw=3.9  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 23JUN2019 116971    40.7N  124.6W 2.5-4.5 AAAAA  Off Coast of No. Calif