MODERATE QUAKES CONTINUE IN SOUTHWEST PACIFIC; HONSHU, JAPAN

 

EARTHQUAKE SUMMARY FOR MAY 31, 2020

 

The strongest earthquake in the world today was an M 5.7 in the Fiji Islands.

This event was not reported felt in this remote area. It continue regional activation which followed the landfall of TC Amphan last week in Pakistan. The area is at about 103 degrees from that landfall and was probably promoted by energy from that event. Similar events have occurred in the area in the last several days with M 5.8-6.1 in the Kermadec Islands, Tonga, Fiji and with lesser magnitude in North Island, New Zealand  - all near 103 degrees from the Amphan landfall. Forecast 124431 had expected this activity within about 100 km of this epicenter was likely around May 25.

 

O: 31MAY2020 23:25:39  23.9S  176.7W Mw=5.7  EMSC   SOUTH OF FIJI ISLANDS        

P: 25MAY2020 124431    23.0S  176.0W 4.0-5.6 CAAAA  Tonga Islands              

 

The second strongest earthquake in the world today was an M 5.3 near the east coast of Honshu, Japan. NEIC reported this earthquake of M 5.2 north of Tokyo, Japan  was felt with intensity II-III in the area(s) north of Tokyo, Japan with V in Ibaraki and Iwate and IV in Tochigi, Japan and II-III in Chiba and Tokyo.  This continues a series of moderate quakes in the area near Tokyo in the past four months which have included an M 5.8 on May 10; an M 5.6 on May 4 and an M 5.3 on February 6, 2020. Forecast 124336 had expected today's activity was likely around May 29.

 

O: 31MAY2020 21:02:10  36.2N  140.4E Mw=5.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 29MAY2020 124336    38.0N  143.0E 4.0-5.5 ABBAA  So. of Honshu              

 

An earthquake of M 4.7 hit northern Haiti today. NEIC reported it was felt with intensity VII in Northern Haiti at Limbe and IV in Cap-Hatien and II-III in Haiti at Gonaives, Castanuelas, Vieus-Bouorg-d Aoquin. This is the strongest earthquake in Haiti since an M 5.9 mainshock and an M 5.4 aftershock on October 7, 2018. Forecast 124284 had expected today's event to the east was likely around May 27.

 

O: 31MAY2020 18:44:50  19.9N   72.6W ML=3.4  EMSC   HAITI REGION                 

O: 31MAY2020 07:44:24  20.0N   72.4W mb=4.7  EMSC   HAITI REGION                 

P: 27MAY2020 124284    20.0N   71.0W 3.0-4.5 BABAA  Bahamas/No. Caribbean      

 

Light to moderate seismicity also continued today in the regions of Puerto Rico and the Virgin Islands. NEIC reported an earthquake of M 3.9 in Southern Puerto Rico  was felt with intensity II-III in the area(s) of Southern Puerto Rico at Ponce (V) and Guayanilla and Coto Laurel (IV) and Guanica, Juana Diaz, Albonito and Bayamon. Forecast 124280 had expected this activity within about 25 km was likely around May 28.

 

O: 31MAY2020 16:47:07  17.9N   66.8W ML=3.9  EMSC   PUERTO RICO REGION

O: 01JUN2020 05:27:34  17.9N   66.8W Md=3.0  EMSC   PUERTO RICO REGION

O: 01JUN2020 04:27:07  17.9N   66.8W Md=3.2  EMSC   PUERTO RICO REGION

O:  1JUN2020 05:16:10  17.9N   66.8W ML=3.4  EMSC   PUERTO RICO REGION           

P: 28MAY2020 124280    18.0N   67.0W 3.4-5.0 BAAAA  Puerto Rico                

 

NEIC also reported earthquakes of M 3.8 and M 3.9 in the Virgin Islands were felt with intensity II-III in the area(s) of the Virgin Islands at Saint Thomas, Culebra, Saint John (IV), Road Town and Frederiksted.  Forecast 124269 had expected this activity within about 25 km was likely around May 28.

 

O: 31MAY2020 19:56:31  18.6N   65.1W ML=3.4  EMSC   VIRGIN ISLANDS REGION

O: 31MAY2020 19:56:31  18.6N   65.1W ML=3.8  ANSS   VIRGIN ISLANDS REGION

O: 31MAY2020 17:46:12  19.2N   65.0W ML=3.9  ANSS   VIRGIN ISLANDS REGION        

O: 31MAY2020 17:46:12  19.2N   65.0W ML=3.4  EMSC   VIRGIN ISLANDS REGION        

P: 29MAY2020 124269    19.0N   65.0W 3.0-5.1 AAAAA  Leeward Islands            

 

An M 4.0 earthquake occurred in the Southern Idaho aftershocks zone today.

NEIC reported this earthquake of M 4.0 in Southern Idaho  was felt with intensity II-III in the area(s) of Southern Idaho in Lowman, Stanley, Garden Valley, Hailey, Garden City, Boise.  This is an aftershock of the M 6.5 in the area of March 31, 2020. Six events of M>=4 have hit the area since the mainshock, the last of which was an M 4.4 on May 21, 2020. Forecast 124359 had expected today's event around May 27.

 

O: 31MAY2020 22:51:22  44.1N  115.1W Ml=3.1  EMSC   SOUTHERN IDAHO

O: 31MAY2020 16:52:05  44.1N  115.1W mb=4.0  EMSC   SOUTHERN IDAHO

O: 31MAY2020 15:09:18  44.3N  115.0W ML=2.3  EMSC   SOUTHERN IDAHO

O: 01JUN2020 05:21:53  44.3N  115.0W Ml=2.7  EMSC   SOUTHERN IDAHO

O: 31MAY2020 16:28:33  44.3N  115.2W Ml=2.3  EMSC   SOUTHERN IDAHO

O: 31MAY2020 08:22:12  44.3N  115.2W Ml=2.8  EMSC   SOUTHERN IDAHO

O: 31MAY2020 23:05:35  44.5N  115.2W Ml=2.4  EMSC   SOUTHERN IDAHO

O: 31MAY2020 17:32:17  44.1N  115.1W Ml=2.9  EMSC   SOUTHERN IDAHO               

P: 27MAY2020 124359    44.4N  115.1W 2.0-4.1 BAAAA  Montana/Idaho              

 

M 6.0 IN SOUTHERN PERU PROBABLY PROMOTED BY GEOMAGNETIC/SOLAR FLARE EFFECTS

 

EARTHQUAKE SUMMARY FOR MAY 30, 2020

 

The strongest earthquake in the world today occurred as an M 5.9-6.1 in Southern Peru. NEIC reported it was felt with maximum intensity V in Puno, Peru at Lampa, Torata, Yunguyo, and IV in Juliaca, Puno, Moquegua, and Mollendo and II-III in Camana, Cusco, and Arequipa. GUC reported this earthquake was felt with intensity  IV in Chile at   Arica and Parinacota at Arica and Cuya; III in Pocon, Chile; in Tarapaca with IV in Alto Hospicio, Huara, Iquique, V in La Tirana, Pisagua and Ujina and III in Camina, Mamina, Pica, and in Quillagua, Antofagasta with III, Chile. This epicenter is located on the geomagnetic equator. A series of moderate solar flares occurred yesterday and today including the largest of the year and first M-class flare of the year (M1.1 at 07:24 UT) and several C-class flares. These increased the disturbance in the geomagnetic field to storm levels. The combination of this disturbance and SFE (Solar Flare Effects) probably triggered the M 6.0 on the geomagnetic equator in Peru today which occurred at the peak of the disturbance within minutes local solar midnight, a time when geomagnetic effects are most prominent. Enhanced seismicity on or near the geomagnetic equator is likely to continue for several days as noted in this summary:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field also  saw disturbed conditions  with AP at 17. This is the strongest disturbance in the geomagnetic field since AP reached 18 on April 20. Strong seismic enhancement is expected near the geomagnetic equator over the next several days." (May 30-31, 2020) 

 

The M 5.9-6.1 was preceded by a foreshock of M 4.0 earlier in the day to the west of the mainshock epicenter.  The last earthquakes of M>=5.9 within about 200 km of today's epicenter occurred as an M 7.0 on March 1, 2019 and an M 6.3 on December 1, 2016. Forecasts 124410 and 124416 had expected today's activity was likely around May 20 in this area.

 

O: 31MAY2020 05:09:35  15.4S   70.6W Mw=5.9  EMSC   SOUTHERN PERU                

O: 31MAY2020 05:09     15.8S   71.2W mb=6.1  GUC    Arica and Parinacota at Arica

O: 30MAY2020 09:57:51  15.7S   71.7W ML=4.0  EMSC   SOUTHERN PERU                

P: 29MAY2020 124410    15.0S   73.0W 4.0-5.6 AAAAA  Central Peru               

P: 29MAY2020 124416    16.0S   74.0W 4.0-5.5 AABAA  So. Peru/Bolivia           

 

The second largest earthquake of the day was an M 5.5 in the Talaud Islands of Indonesia. Like the event in Peru, it occurred on the geomagnetic equator and was probably enhanced by the geomagnetic storm which peak was simultaneous with the quake. It was not reported felt. This is the strongest earthquake in the Talaud Islands since an M 6.0 on February 6, 2020 and prior to that an M 5.5 on December 5, 2019. Forecast 124235 expected today's event was likely around May 31 to the west of today's epicenter.

 

O: 30MAY2020 13:06:25   4.1N  126.5E Mw=5.5  EMSC   KEPULAUAN TALAUD, INDONESIA  

O: 30MAY2020 13:06:24   4.0N  126.6E Mw=5.5  ANSS   KEPULAUAN TALAUD, INDONESIA  

P: 31MAY2020 124235     4.0N  125.0E 4.0-5.7 AABAA  Mindanao, Philippines      

 

The largest earthquake in the U.S. or Canada today was an M 4.3 in the aftershock area near Mammoth Lakes, California. NEIC reported this quake was felt with intensity II-III in California at Lee Vining, June Lake, Mammoth Lakes, Yosemite National Park, Coleville, Bishop, El Portal and Mariposa and in Nevada at Yerington and Hawthorne. This is the strongest event in this swarm north of Mammoth Lakes, California since an M 4.6 on May 15, 2020 at the start of this swarm. The strongest quakes in the swarm to date have been M 4.3-4.4. A stronger shock hit the area with M 5.2 on April 11, 220, the largest in the region since December 28, 2016 when an M 5.5-5.6 occurred.  Today's activity occurred at the peak of the geomagnetic storm and may have been promoted by SFE. Forecasts 124301 and 124303 had expected this activity was likely around May 27-30.

 

O: 31MAY2020 01:37:18  38.0N  118.8W ML=3.0  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 09:07:32  38.0N  118.8W ML=3.4  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 09:22:57  38.0N  118.8W ML=3.4  EMSC   CENTRAL CALIFORNIA

O: 31MAY2020 01:24:32  38.1N  118.8W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 31MAY2020 01:07:15  38.1N  118.8W Mw=4.3  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 17:17:05  38.0N  118.8W ML=2.9  EMSC   CENTRAL CALIFORNIA           

P: 27MAY2020 124303    38.2N  118.8W 2.5-4.5 BAAAA  California/Nevada area     

P: 30MAY2020 124301    37.4N  118.6W 2.5-4.4 AAAAA  California/Nevada area     

 

An unusual swarm of light earthquakes also occurred today in the area west of Bakersfield, California. These ranged up to M 2.4 and was the strongest swarm in the area since November 21, 2019 when an M 3.2 occurred northwest of this. Forecast 124329 had expected this activity to the east at the end of May.

 

O: 31MAY2020 02:30:30  35.5N  119.7W ML=2.2  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 11:35:46  35.5N  119.7W ML=2.4  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 14:33:03  35.5N  119.7W ML=2.6  ANSS   CENTRAL CALIFORNIA

O: 30MAY2020 14:33:03  35.5N  119.7W ML=2.4  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 11:04:27  35.5N  119.7W Ml=2.2  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 10:42:26  35.5N  119.8W ML=2.3  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 11:59:14  35.5N  119.8W Ml=2.1  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 12:16:53  35.5N  119.7W ML=2.1  EMSC   CENTRAL CALIFORNIA           

P: 27MAY2020 124329    35.0N  119.2W 2.5-4.5 BAAAA  So. California             

P: 31MAY2020 124329    34.7N  119.0W 2.5-4.6 AAAAA  So. California             

 

An M 3.9 also shook regions of Hawaii today. This is the strongest shaker in  Hawaii since an similar M 3.9 in the Loi'hi area south of the island on May 11 and the strongest within Hawaii since an M 4.2 on April 12, 2020 and February 3, 2020, the only such events in the past six months at this magnitude level. NEIC reported this earthquake of M 3.9 in Hawaii  was felt with intensity II-III in the area(s) of Hawaii at Naalehu, Volcano, Captain Cook, Hilo, Kamuela, and Honokaa. Forecast 124289 had expected today's event within about 25 km was likely at the end of May.

 

O: 31MAY2020 05:34:57  19.2N  155.4W ML=3.9  EMSC   ISLAND OF HAWAII, HAWAII     

O: 30MAY2020 15:33:17  19.4N  155.6W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII     

P: 26MAY2020 124289    19.4N  155.1W 4.0-5.4 BAAAA  Hawaii area                

 

 

 

 

 

 

SEISMIC SWARM IN NORTHERN MID-ATLANTIC

 

EARTHQUAKE SUMMARY FOR MAY 29, 2020

 

The strongest seismicity in the world today occurred in the Northern Mid-Atlantic Ridge. These events of M 5.6, 5.4, 5.1 and 4.6 were not reported felt in this remote mid-ocean ridge. This is the strongest activity within about 200 km of this epicenter since a similar M 5.6 14 years ago on August 9, 2007. Forecast 124291 had expected today's activity at the end of May. This activity is at 103 degrees from the M 7.6 in the Kurils of March 25, 2020, the last major earthquake in the world. It was probably promoted by concentrated energy  from that source. Puerto Rico, another area of high seismicity in recent months is at a similar distance from the Kuril Islands.

 

O: 30MAY2020 03:51:48  25.9N   45.0W Mw=5.1  EMSC   NORTHERN MID-ATLANTIC RIDGE

O: 30MAY2020 03:29:32  25.9N   45.0W Mw=5.4  EMSC   NORTHERN MID-ATLANTIC RIDGE

O: 30MAY2020 03:21:51  25.9N   45.0W Mw=5.6  EMSC   NORTHERN MID-ATLANTIC RIDGE

O: 30MAY2020 03:46:12  25.9N   44.9W mb=4.6  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 24MAY2020 124291    23.0N   45.0W 4.0-5.7 CCAAA  Mid-Atlantic Ridge         

 

The strongest earthquake in the U.S. or Canada today was an M 4.0-4.1 aftershock in eastern Nevada. It was lightly felt in the Tonopah, Nevada area. The M 4.0 was preceded several hours earlier by an M 3.6-3.9. The last aftershock of larger magnitude was an M 4.2 on May 27, 2020. Forecast 124302 had expected today's activity was likely around May 29.

 

O: 29MAY2020 20:45:38  38.2N  117.7W ML=3.6  EMSC   NEVADA

O: 29MAY2020 20:45:38  38.2N  117.7W ML=3.9  ANSS   NEVADA

O: 29MAY2020 15:03:40  38.2N  117.9W ml=3.1  EMSC   NEVADA

O: 29MAY2020 13:25:32  38.2N  117.7W ml=3.1  EMSC   NEVADA

O: 29MAY2020 23:43:42  38.2N  118.0W ML=3.7  EMSC   NEVADA                       

O: 29MAY2020 23:43:42  38.2N  118.0W ML=4.0  ANSS   NEVADA                       

P: 29MAY2020 124302    38.0N  117.9W 2.5-4.5 AAAAA  California/Nevada area     

 

An M 4.1 also occurred in the Alaska Peninsula today. A similar M 4.4 hit the area  about 150 km east of this on May 23 and an M 4.1 on May 17. The only other such event in the area in the past six months was an M 4.7 on February 17, 2020. Forecast 124158 had expected the area would be active at the end of May.

 

O: 30MAY2020 04:09:05  56.7N  156.1W mb=4.1  EMSC   ALASKA PENINSULA             

P: 21MAY2020 124158    54.8N  158.7W 3.5-5.0 CBBAA  Alaska Peninsula           

 

A swarm of light earthquakes also occurred in the Yellowstone National Park area today. The area has been quiet since the M 6.5 in Idaho triggered a swarm in Yellowstone on March 31, 2020. The last an only earthquakes in Yellowstone this year were an M 2.9 on March 31 and an M 2.6 on January 10, 2020. Forecast 124376 had expected today's activity within about 25 km was likely around May 26.

 

O: 29MAY2020 10:39:06  44.7N  110.8W ML=2.5  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 09:15:07  44.7N  110.8W Ml=2.1  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 11:37:46  44.7N  110.8W Ml=2.1  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 09:54:52  44.7N  110.8W Ml=2.2  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 11:11:18  44.7N  110.8W Ml=2.2  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 10:42:06  44.7N  110.8W Ml=2.3  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 09:45:36  44.7N  110.8W Ml=2.4  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 10:40:10  44.7N  110.8W Ml=2.5  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 26MAY2020 124376    44.4N  110.8W 2.0-4.1 BAAAA  Yellowstone/Wyoming        

 

MODERATELY STRONG QUAKE IN KERMADEC ISLANDS, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR MAY 28, 2020

 

A moderately strong earthquake of M 5.8 in the Northern Kermadec Islands of New Zealand today completed the set of such events in the area which followed landfall of TC Amphan last week. It also followed an M 5.9 to the north in the Tonga Islands, yesterday. This summary had expected this activity as:

 

"TC Amphan (01B) continued today in the area south of Pakistan with winds up to 105 kts as a major cyclone. This is the strongest cyclone ever recorded in this area of the Bay of Bengal. It is expected to track to the north possibly affect seismicity in Bangladesh, eastern Pakistan and central and southeastern Asia in the next week. The antipode of the expected landfall is a about 21S 92W in the South Pacific - a non-seismic region. Areas at 144 degrees from the expected landfall include Mexico and Guatemala, those near 103 degrees include areas off Washington State and the Kermadec Islands. These may see seismic enhancement with landfall of this powerful storm." (May 18-20, 2020)

 

and reviewed the  progress to date in the previous issue of this summary as:

 

"A series of moderate earthquakes continued today in the Southwestern Pacific.

These included an M 5.9 in Tonga, an M 6.1 in Vanuatu and several moderate aftershocks; events in Fiji (M 4.3, 4.5) and in north and South Island, New Zealand of M 4.0 and 4.5. This activity is located at 101-104 degrees from the landfall of TC Amphan in Bangladesh late last week." (May 28-29, 2020)

 

Today's M 5.8 in the northern Kermadec Islands is the strongest event within about 200 km of this epicenter in the Kermadec Islands since an M 6.3 on March 14, 2020 and an M 5.8 on January 10, 2019. Prior to that the area had been quiet at this magnitude level for more than 30 years.  It was not felt in this remote area. Forecast 124432 expected this event in this area was likely around May 29. This epicenter is at 103.0 degrees from the Amphan landfall location and was probably promoted by energy from that event.

 

O: 28MAY2020 09:46:48  27.7S  174.9W Mw=5.8  EMSC   KERMADEC ISLANDS REGION      

P: 29MAY2020 124432    27.0S  177.0W 4.0-5.7 AABAA  Tonga Islands              

 

The Kermadec quake followed an M 5.9 in Tonga. The last earthquake in the region of Tonga within about 200 km of this epicenter with M>=5.9 was recorded nearly a year ago on June 2 and June 15, 2019 with M 5.9 and 6.1. Forecast 124430 had expected today's activity was likely around May 30 in this area. This epicenter in Tonga is at 104 degrees from the landfall of TC Amphan of May 22 and was probably enhanced by energy from that event.

 

O: 28MAY2020 07:18:44  22.3S  174.4W Mw=5.9  EMSC   TONGA REGION                 

P: 30MAY2020 124430    21.0S  175.0W 4.0-5.8 ABAAA  Tonga Islands              

 

Moderate earthquakes today accompanied the M 5.8 in the Kermadec Islands in the central and southern Kermadecs and in North and South Islands, New Zealand.

 

O: 28MAY2020 17:19:30  31.6S  179.9E mb=4.2  EMSC   KERMADEC ISLANDS REGION      

P: 28MAY2020 124439    30.0S  179.0E 4.0-5.6 ABAAA  No. Kermadec Islands       

 

O: 29MAY2020 00:05:27  35.2S  180.0E ML=4.1  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 31MAY2020 124440    35.0S  179.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

O: 28MAY2020 08:33:26  40.5S  175.0E ML=4.2  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 25MAY2020 124446    40.0S  175.0E 3.0-4.6 BAAAA  North Island, N.Z.         

 

Triggering of seismicity by stresses from TC Amphan was not limited to the Tonga-Kermadec-New Zealand arc today. Two moderate earthquakes also occurred in the immediate area where landfall occurred in Bangladesh and northeastern India with M 4.5 and 4.8. In particular an M 4.5 in Bangladesh at the landfall site of Amphan probably was a product of delayed triggering from stresses associated with Amphan. It is the strongest quake in the landfall area since an M 5.3 on September 12, 2018. Forecast 124292 had expected this activity was likely at the end of May.

 

O: 29MAY2020 02:47:44  24.5N   89.9E ML=4.5  EMSC   BANGLADESH                   

P: 24MAY2020 124292    27.0N   92.0E 4.0-5.5 BCBAA  Myanmar                    

 

The M 4.8 about 500 km in the Bihar, India area northwest of the Bangladesh epicenter was the strongest within about 200 km of that epicenter since an M 5.0 on February 15, 1993. Forecast 124346 had expected regional seismicity at the end of May.

 

O: 28MAY2020 08:40:27  25.7N   85.5E ML=4.8  EMSC   BIHAR, INDIA                 

P: 28MAY2020 124346    31.0N   88.0E 3.8-5.4 ACBAA  Xizang                     

 

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in the aftershock area of western Nevada. An M 4.2 occurred in this area on May 27, the last at this magnitude level in the aftershock zone. Forecast 124302 had expected elevated regional seismicity around May 29.

 

O: 28MAY2020 08:29:46  38.2N  118.0W mb=3.9  EMSC   NEVADA                       

O: 28MAY2020 20:44:31  38.1N  118.1W ml=3.0  EMSC   NEVADA

O: 28MAY2020 18:45:35  38.2N  117.8W ml=3.2  EMSC   NEVADA

O: 28MAY2020 12:03:21  38.2N  117.7W ML=3.1  EMSC   NEVADA

P: 29MAY2020 124302    38.0N  117.9W 2.5-4.5 AAAAA  California/Nevada area     

 

An unusual earthquake today was an M 3.5 in the Labrador Sea off Newfoundland, Canada. This is the strongest event recorded within  about 250 km of this epicenter since an M 3.8 on May 17, 2008. Forecast 124394 had expected today's event in this region to the northeast of today's epicenter was likely around May 29.

 

O: 28MAY2020 14:48:49  58.3N   60.2W MB=3.6  ECAN Nutak, NL                      

O: 28MAY2020 14:48:49  58.3N   60.2W ML=3.6  EMSC   LABRADOR SEA                 

P: 29MAY2020 124394    61.0N   58.0W 2.5-4.1 ACBAA  Baffin/Davis Strait Canada 

 

 

 

 

 

 

 

 

 

SEISMIC ACTIVATION CONTINUES IN SOUTHWESTERN PACIFIC

 

EARTHQUAKE SUMMARY FOR MAY 27, 2020

 

A series of moderate earthquakes continued today in the Southwestern Pacific.

These included an M 5.9 in Tonga, an M 6.1 in Vanuatu and several moderate aftershocks; events in Fiji (M 4.3, 4.5) and in north and South Island, New Zealand of M 4.0 and 4.5. This activity is located at 101-104 degrees from the landfall of TC Amphan in Bangladesh late last week. More such activity is expected in the area in the next several days before the effects of Amphan have dissipated. The strongest earthquake in the world today was an M 5.9 in Tonga north of the Kermadec Islands. NEIC reported it was felt with intensity II-III in Tonga at Tofoa-Koloua and Nuku'alofa. This continues seismic enhancement in the region of New Zealand, the Vanuatu Islands and Tonga which apparently was triggered by energy associated with landfall of TC Amphan in Bangladesh late last week. This summary had expected this as:

 

"TC Amphan (01B) continued today in the area south of Pakistan with winds up to 105 kts as a major cyclone. This is the strongest cyclone ever recorded in this area of the Bay of Bengal. It is expected to track to the north possibly affect seismicity in Bangladesh, eastern Pakistan and central and southeastern Asia in the next week. The antipode of the expected landfall is a about 21S 92W in the South Pacific - a non-seismic region. Areas at 144 degrees from the expected landfall include Mexico and Guatemala, those near 103 degrees include areas off Washington State and the Kermadec Islands. These may see seismic enhancement with landfall of this powerful storm." (May 18-20, 2020)

 

The last earthquake in the region of Tonga within about 200 km of this epicenter with M>=5.9 was recorded nearly a year ago on June 2 and June 15, 2019 with M 5.9 and 6.1. Forecast 124430 had expected today's activity was likely around May 30 in this area. This epicenter in Tonga is at 104 degrees from the landfall of TC Amphan of May 22 and was probably enhanced by energy from that event.

 

O: 28MAY2020 07:18:44  22.3S  174.4W Mw=5.9  EMSC   TONGA REGION                 

P: 30MAY2020 124430    21.0S  175.0W 4.0-5.8 ABAAA  Tonga Islands              

 

O: 27MAY2020 10:29:23  17.6S  180.0E mb=4.3  EMSC   FIJI                          

O: 27MAY2020 15:41:49  18.0S  178.4W mb=4.5  EMSC   FIJI REGION                  

P: 26MAY2020 124418    18.0S  178.0W 4.0-5.6 AAAAA  Tonga Islands              

 

An M 5.1 in the Kermadec Islands area of New Zealand is the strongest within about 200 km of that event in the Kermadec Islands since an M 6.0 a month ago on April 14, 2020 and appears to be an aftershock of that mainshock. It was not reported felt in this remote area. Forecast 124443 had expected today's activity in this area was likely around May 28. This epicenter is  located at 103 degrees from the landfall of TC  Amphan and may have been  promoted by energy from that event.

 

O: 27MAY2020 10:26:47  31.4S  178.4W mb=5.1  EMSC   KERMADEC ISLANDS REGION      

P: 28MAY2020 124443    31.0S  177.0W 4.0-5.6 AAAAA  So. Kermadec Islands       

 

O: 27MAY2020 10:32:59  39.8S  172.8E ML=4.0  EMSC   OFF W. COAST OF N. ISLAND, N.Z

P: 27MAY2020 124440    39.0S  174.0E 3.0-4.4 AAAAA  North Island, N.Z.         

 

GEONET reported the event in South Island was felt with moderate intensity in northern South Island. 308 people reported feeling this event; 208 with weak intensity; 87 with light shaking; 12 moderate; 1 strong; 0 with severe and 0 with extreme shaking. The last event with M>=4.5 within about 100 km of this epicenter occurred on  Forecast 124448 had expected today's event within about 15 km of the epicenter was likely around May 27.  This epicenter is located at 102 degrees from the landfall of TC  Amphan and may have been  promoted by energy from that event.

 

O: 27MAY2020 14:43:21  41.9S  172.9E ML=4.5  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 27MAY2020 14:43:21  41.9S  172.9E ML=4.5  GEONET Felt with moderate intensity

P: 27MAY2020 124448    42.0S  173.0E 3.0-5.2 AAAAA  So. Island, N.Z.           

 

An M 5.1 was widely felt in Luzon, Philippines today. NEIC reported maximum intensity V in Ilogon and Bued and Alaminos and II-III in Catabian, Lingayen, Banagang, Concepcion, Paringao, Ilocos, San Fernando, Baguio (IV) and Tuding, Cordillera, Philippines.  PHIVOLCS reported it was felt with intensity IV in San Fernando, Caba and Balaoan, La Union; Labrador and Bolinao, Pangasinan, Dagupan City; III in Urdaneta City and Villasis, Pangasinan; Baguio City; Quezon City; Marikina City, Obando, Bulacan; and II in Cainta, Rizal; San Fernando, Pampanga; Valenzuela City; Navotas City; Pasay City; Paranaque City, City of Manila and City of San Jose Del Monte, Bulacan. This is first event of M>=5.1 in Luzon, Philippines within about 200 km of this epicenter since an M 5.4 more than a year ago on February 6, 2019 (M 5.4) and before that an M 5.3 on May 25, 2017. Forecast 124270 had expected activity in Luzon around May 26 to the south of today's epicenter.

 

O: 28MAY2020 05:17:31  16.6N  120.4E Mw=5.1  EMSC   LUZON, PHILIPPINES           

P: 26MAY2020 124270    13.0N  121.0E 3.5-4.9 ACAAA  Luzon, Philippines         

 

The second largest earthquake in the world today was an M 5.4 in the South Indian Ocean area.  This event is within about 100 km of the exact antipode of the M 6.1 in the Southern Baja California area of May 21 as noted when several similar events in the South Indian Ocean area occurred on May 23: An M 5.7 occurred a month ago at this epicenter on April 17.

 

O: 27MAY2020 21:09:11  23.7S   69.6E mb=5.4  EMSC   MID-INDIAN RIDGE             

 

 

".. mid-ocean activity of note today was a series of events in the southern Indian Ocean including an M 5.6. This activity is near the antipode of the M 6.1 in Baja California, Mexico which occurred yesterday and may have been promoted by antipodal concentration of energy from that event." (May 24, 2020)

 

An earthquake of M 3.1-3.4 shook areas south of San Francisco, California today. NEIC reported it was felt with intensity II-III in Central California at Aromas, San Juan Bautista, Salinas, Watsonville, Gilroy, Castroville, Manna, Capitola and Morgan Hill. The last earthquake of M>=3.4 within about 50 km of this epicenter was an M 3.7 on February 13, 2020. Forecast 124307 had expected today's event in this region was likely around May 25-27.

 

O: 27MAY2020 15:56:36  36.7N  121.2W Md=2.8  EMSC   CENTRAL CALIFORNIA

O: 28MAY2020 06:09:07  36.9N  121.6W Md=2.2  EMSC   CENTRAL CALIFORNIA

O: 27MAY2020 17:01:59  36.9N  121.8W ML=3.1  EMSC   CENTRAL CALIFORNIA           

O: 27MAY2020 17:02:01  36.9N  121.6W ML=3.4  ANSS   CENTRAL CALIFORNIA           

P: 25MAY2020 124307    36.7N  121.4W 2.5-4.4 AAAAA  Central California         

P: 27MAY2020 124307    36.2N  121.8W 2.5-4.4 AAAAA  Central California          

 

A moderate M 3.9-4.2 in the Nevada aftershock zone was the largest earthquake in the U.S. or Canada today. NEIC reported it was felt with intensity III in Luning, Nevada. The last aftershock of M>=4.2 in this zone occurred on May 22, 2020 with M 5.3. Forecast 124302 had expected today's activity was likely at this epicenter around May 29.

 

O: 27MAY2020 21:45:02  38.1N  118.1W ML=3.1  EMSC   NEVADA

O: 27MAY2020 17:43:11  38.2N  117.8W ML=3.0  EMSC   NEVADA

O: 27MAY2020 16:03:23  38.2N  117.8W mb=3.9  EMSC   NEVADA                       

O: 27MAY2020 16:03:23  38.2N  117.8W mb=4.2  ANSS   NEVADA                       

P: 29MAY2020 124302    38.0N  117.9W 2.5-4.5 AAAAA  California/Nevada area     

 

A light earthquake of M 3.8 continued the current level of seismicity in Hawaii today. This event was reported by NEIC to have been felt with intensity II-III in Hawaii at Naalehu, Volcano, Captain Cook, Mountain View, Hilo, Kurtistown, Keaau and Papaikou. A pair of events of M 3.8 hit Hawaii on May 21. Forecast 124289 had expected today's activity within about 25 km likely around May 26.  This epicenter is  located at 104 degrees from the landfall of TC  Amphan and may have been  promoted by energy from that event.

 

O: 28MAY2020 03:49:26  19.2N  155.4W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

O: 27MAY2020 12:32:40  19.2N  155.4W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII     

P: 26MAY2020 124289    19.4N  155.1W 4.0-5.4 AAAAA  Hawaii area                

 

Strong aftershocks also continued today in the Vanuatu region. In the previous issue of this summary it had been noted when an M 6.1 hit the area on May 27:

 

"The strongest earthquake in the world today was an M 6.1 in Vanuatu. NEIC reported it was felt with intensity IV in Vila Shefa, Vanuatu. The mainshock was preceded by several foreshocks, including an M 4.8, 4.9 and 5.6 which were also lightly felt at Vila Shefa, Vanuatu. This is an area where strong volcanism has occurred over the past several years and these may be part of a volcanic eruption in the area. The last earthquake of M>=6.6 in the region within about 200 km of today's epicenter was an M 6.6 on July 31, 2019 at 179 km depth. The last such events at a shallow focus was an M 6.5 on August 21, 2018 and an M 6.1 on June 21, 2018. Forecast 124419 had expected today's activity was likely within about 25 km around May 24. These epicenters are at 103 degrees from the M 5.6 in Chiapas, Mexico two days ago and may have been enhanced by energy from that source." (May 26-27, 2020)

 

NEIC reported the aftershock today  of M 5.1 in Central Vanuatu was felt with intensity II-III in the area(s) of Central Vanuatu at Vila Shefa.

 

O: 27MAY2020 07:09:10  17.1S  167.9E Mw=6.1  EMSC   VANUATU

O: 27MAY2020 22:34:06  17.1S  167.9E mb=4.7  EMSC   VANUATU

O: 27MAY2020 19:01:48  17.3S  167.6E mb=4.9  EMSC   VANUATU

O: 27MAY2020 08:05:55  17.3S  167.6E mb=5.1  EMSC   VANUATU

O: 27MAY2020 07:09:10  17.1S  167.9E Mw=6.1  EMSC   VANUATU

P: 24MAY2020 124419    17.0S  168.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

QUAKES SHAKE VANUATU

 

EARTHQUAKE SUMMARY FOR MAY 26, 2020

 

The strongest earthquake in the world today was an M 6.1 in Vanuatu. NEIC reported it was felt with intensity IV in Vila Shefa, Vanuatu. The mainshock was preceded by several foreshocks, including an M 4.8, 4.9 and 5.6 which were also lightly felt at Vila Shefa, Vanuatu. This is an area where strong volcanism has occurred over the past several years and these may be part of a volcanic eruption in the area. The last earthquake of M>=6.6 in the region within about 200 km of today's epicenter was an M 6.6 on July 31, 2019 at 179 km depth. The last such events at a shallow focus was an M 6.5 on August 21, 2018 and an M 6.1 on June 21, 2018. Forecast 124419 had expected today's activity was likely within about 25 km around May 24. These epicenters are at 103 degrees from the M 5.6 in Chiapas, Mexico two days ago and may have been enhanced by energy from that source. Moderate seismicity in Crete, Greece was also at this distance from Chiapas today. A series of light earthquakes was also reported today in the Canary Islands in the Atlantic Ocean. These area located at 103 degrees from the last major earthquake in the world  - the M 7.6 in the Kurils of March 25. The area of the Canary Islands is also subject to volcanism.

 

O: 26MAY2020 23:12:02  17.1S  167.5E mb=4.9  EMSC   VANUATU

O: 27MAY2020 02:55:03  17.1S  167.8E mb=4.8  EMSC   VANUATU

O: 27MAY2020 07:09:10  17.1S  167.9E Mw=6.1  EMSC   VANUATU

O: 26MAY2020 22:52:13  17.0S  167.8E Mw=5.6  EMSC   VANUATU                       

P: 24MAY2020 124419    17.0S  168.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

An unusual M 5.2 earthquake occurred today in the Southern East Pacific Rise.

Three earthquakes of M>=5.2 have hit within about 250 km of this epicenter in  the past six years - an M 5.5 on January 23, 2016; an M 5.4 on May 4, 2019 and an M 5.8 on December 25, 2019. Today's event was not reported felt in this remote epicentral area. Forecast 124426 had expected today's event was likely within about 100 km of this epicenter around May 27. This event is near 105 degrees from the Banda Sea and could have been influenced by energy from that source.

 

O: 27MAY2020 02:33:12  24.5S  116.1W mb=5.2  EMSC   SOUTHERN EAST PACIFIC RISE   

P: 27MAY2020 124426    24.0S  115.0W 4.0-5.6 AAAAA  So. East Pacific Rise      

 

An M 3.6-3.7 was widely felt in the Bakersfield area of Central California today. This is not part of any current aftershock sequence and may represent an area of stress where a larger quake may follow. NEIC reported it was felt with intensity II-III in Bakersfield, Lamont region. This is the strongest earthquake in the Bakersfield, California area within about 100 km since an M 3.8 on April 16, 2018.  Forecast 124306 had expected today's event was likely within about 50 km around May 27.

 

O: 27MAY2020 04:52:29  35.4N  119.0W Mw=3.6  EMSC   BAKERSFIELD URBAN AREA, CALIF.

O: 27MAY2020 04:52:31  35.4N  119.0W Mw=3.7  ANSS   BAKERSFIELD URBAN AREA, CALIF.

P: 27MAY2020 124329    35.0N  119.2W 2.5-4.5 AAAAA  So. California             

 

An M 3.8 aftershock also was felt in the area of western Nevada near Tonopah today. Forecast 124306 had expected continuing aftershocks at this level at the end of May.

 

O: 27MAY2020 00:57:02  38.2N  118.0W ML=3.5  EMSC   NEVADA

O: 27MAY2020 00:57:02  38.2N  118.0W ML=3.8  ANSS   NEVADA

O: 26MAY2020 22:14:30  38.2N  117.8W ML=3.3  EMSC   NEVADA

O: 26MAY2020 09:30:41  38.1N  117.9W ML=3.1  EMSC   NEVADA

O: 26MAY2020 06:40:46  38.2N  118.0W ML=3.0  EMSC   NEVADA

O: 27MAY2020 03:16:09  38.2N  117.8W ML=3.2  EMSC   NEVADA                       

P: 29MAY2020 124306    38.7N  119.7W 2.5-4.5 AAAAA  California/Nevada area     

 

An event of M 3.4 also occurred in Hawaii today. This continues seismicity at this magnitude level which has been seen in the area throughout the month of May and may indicate a forthcoming re-eruptive phase of regional seismicity.

The M 3.3-3.4 was also felt in Hawaii with intensity II-III in Volcano, Hilo, Kurtistown, Keaau and Papaikou today. Forecast 124289 had expected today's event was likely within about 25 km around May 26.

 

O: 26MAY2020 15:55:40  19.5N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII     

P: 26MAY2020 124289    19.4N  155.1W 4.0-5.4 AAAAA  Hawaii area                

 

MANIPUR, INDIA SHAKES TO MODERATE QUAKE

 

EARTHQUAKE SUMMARY FOR MAY 25, 2020

 

The most widely felt earthquake in the world today occurred in Manipur, India with M 5.1. This event is near the landfall of TC Amphan several days ago and may have been triggered by that event. NEIC reported it was felt with maximum intensity V in Manipur, India and II-III in Moirang, Mayang, Imphas, Thoubal, in Assam at Silchar, Lala, Aizael and Kolasib, Mizoram. This is the largest earthquake within about 200 km of this epicenter since an M 5.9 on April 16, 2020 and prior to that an M 5.3 on April 4, 2019. Forecast 124292 had expected regional seismicity enhancement with TC Amphan was likely in the area around May 24.

 

O: 25MAY2020 14:42:17  24.4N   93.9E Mw=5.1  EMSC   MANIPUR, INDIA REGION        

P: 24MAY2020 124292    27.0N   92.0E 4.0-5.5 ACBAA  Myanmar                    

 

The strongest earthquake in the world today was an M 5.4 in the area south of Guam. NEIC reported it was felt with intensity III in Mangilao, Guam. The last earthquake of M>=5.4 within about 200 km of Guam was an M 5.6 and an aftershock of M 5.5 on July 16 and 21, 2019. The last of significantly larger magnitude occurred as an M 5.8 on September 23, 2018. Regional seismicity often peaks during typhoon season, so this may be the opening event of several this summer in the region. Forecast 124051 had expected today's activity was likely in mid-May.

 

O: 25MAY2020 23:22:25  12.6N  144.2E Mw=5.4  EMSC   GUAM REGION                  

O: 26MAY2020 05:25:42  14.3N  146.8E mb=5.2  EMSC   ROTA REGION, N. MARIANA ISLAND

P: 16MAY2020 124051    15.0N  147.0E 4.0-5.4 CAAAA  No. Marianas               

 

Aftershocks continued in the Cook Strait of New Zealand today following the M 5.5-5.9 quake yesterday. The largest of today's regional events was an M 5.0-5.6. NEIC reported it was felt with intensity V in Levin Manawatu-Wanganui and IV in Te Horo, Kapiti, and Porirua, Wellington. Lesser shaking was reported from Palmerston North, Wanganui, Lower Hutt, New Plyouth and Tapawera. GEONET reported this earthquake was felt with moderate intensity in Cook Strait and northern South Island. 20626 people reported feeling this event; 5854 with weak intensity; 10177 with light shaking; 3966 moderate; 582 strong; 22 with severe and 25 with extreme shaking. Forecast 124446 had expected this activity was likely within about 50 km of this epicenter around May 25. This summary noted the mainshock in the previous issue as:

 

 

"The last event in the Cook Strait within about 200 km of today's epicenter was an M 6.2 on January 20, 2014. There have been no larger quakes in the Cook Strait in the past 30 years. Forecasts 124222 and 124446 had expected today's activity was likely around May 19-25. This epicenter is at 103 degrees from the landfall of Amphan and 100-105 from events of M 6.5 in Idaho and Nevada and at the seventh node (52 degrees) from the Banda Sea and was probably promoted by energy from all these sources." (May 24-25, 2020)

 

This epicenter is also at 101 degrees from the M 5.5 in Chiapas, Mexico two days ago.

 

O: 26MAY2020 00:34:03  40.5S  175.0E Mw=5.0  EMSC   COOK STRAIT, NEW ZEALAND     

O: 26JUN2020 00:34:04  40.5S  175.0E ML=5.6  GEONET Felt with moderate intensity

P: 25MAY2020 124446    40.0S  175.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

 

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 near Rock Mountain House, Alberta, Canada. It was not reported felt in this remote area.

The last earthquake in this area with M>=3.7 was an M 4.3 on March 10, 2019 and prior to that an M 4.3 on August 9, 2014 and of M 4.0 on June 10, 1997. Forecast

124377 had expected this activity in Alberta was likely around May 24 within about 25 km of the epicenter. This epicenter is at 103 degrees from the landfall of TC Amphan, similar to that of the events in Cook Strait, New Zealand and may have been promoted by energy from that source.

 

O: 24MAY2020 09:04:32  52.2N  115.3W MB=3.7  ECAN Rocky Mountain House, AB       

P: 24MAY2020 124377    52.0N  115.0W 2.0-4.0 AAAAA  Alberta                    

 

MODERATELY STRONG QUAKE SHAKES WELLINGTON, NEW ZEALAND REGION

 

EARTHQUAKE SUMMARY FOR MAY 24, 2020

 

A moderately strong M 5.5-5.7 quake shook the areas around the Cook Strait, New Zealand today. The quake briefly interrupted the Prime Minister during a Covid-19 televised briefing. NEIC reported the mainshock was felt with maximum intensity VI in Te Horo, Wellington; V in Lower Hutt, Makara-Ohanu, Wellington and IV in Wanganui Manawatu, Palmerston North, Kapiti, Porirua and in Picton, Marlborough, South Island. GEONET reported the mainshock was felt with strong intensity in Cook Strait and northern South Island. 36867 people reported feeling this event; 6837 with weak intensity; 14471 with light shaking; 12291 moderate; 3057 strong; 177 with severe and 34 with extreme shaking. GEONET also reported moderate aftershocks of M 4.0, 4.4, 4.5 and 4.3 were felt by thousands. An aftershock of M 4.1 was reported felt with intensity III in Kapiti, Wellington and in Palmerston North Manawatu-Wanganui, New Zealand. This area was considered vulnerable to seismic enhancement at this time as noted in the previous issue of this summary:

 

 

"Note that the area of northern New Zealand from the Cook Strait to the Kermadec Islands is at 101-104 degrees from the landfall of TC Amphan. Earthquakes in  the past several days suggest activation of this area and a stronger event is possible in the next several days as well. This region is also at 100-103 degrees from the M 5.5 in Chiapas, Mexico, and from the M 6.5 in Nevada of May 15 increasing the likelihood a seismic enhancement at this time. A light earthquake of M 4.3 shook areas of North Island today. NEIC reported this earthquake of M 4.4 in North Island, New Zealand  was felt with intensity II-III in the area(s) of North Island, New Zealand at Te Puke, Bay of Plenty.

This event had been anticipated in forecast 124440 to occur around May 25. This is the strongest quake in this area in more than two months - since an M 4.8 on March 15, 2020. This event is at 103 degrees from the landfall of TC Amphan and at 103 degrees from the M 6.5 in Southern Idaho of March 31 and was probably promoted by energy from those events." (May 23-24, 2020)

 

The last event in the Cook Strait within about 200 km of today's epicenter was an M 6.2 on January 20, 2014. There have been no larger quakes in the Cook Strait in the past 30 years. Forecasts 124222 and 124446 had expected today's activity was likely around May 19-25. This epicenter is at 103 degrees from the landfall of Amphan and 100-105 from events of M 6.5 in Idaho and Nevada and at the seventh node (52 degrees) from the Banda Sea and was probably promoted by energy from all these sources.

 

O: 24JUN2020 19:53:33  40.5S  174.9E ML=5.9  GEONET Felt with strong intensity

O: 24JUN2020 21:47:41  40.5S  174.9E ML=4.0  GEONET Felt with moderate intensity

O: 24JUN2020 22:44:30  40.5S  175.0E ML=4.4  GEONET Felt with moderate intensity

O: 25JUN2020 00:38:27  40.4S  175.0E ML=4.5  GEONET Felt with moderate intensity

O: 25JUN2020 05:44:15  40.4S  175.0E ML=4.3  GEONET Felt with moderate intensity

O: 25MAY2020 05:44:15  40.4S  175.0E ML=4.1  EMSC   COOK STRAIT, NEW ZEALAND

O: 25MAY2020 00:38:27  40.4S  175.0E ML=4.4  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 24MAY2020 19:53:32  40.4S  175.0E Mw=5.5  EMSC   COOK STRAIT, NEW ZEALAND

O: 24MAY2020 21:47:41  40.5S  175.0E ML=4.0  EMSC   COOK STRAIT, NEW ZEALAND

O: 24MAY2020 22:44:30  40.5S  175.0E mb=4.2  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 19MAY2020 124222    41.0S  175.0E 3.0-5.0 BAAAA  So. Island, N.Z.            

P: 25MAY2020 124446    40.0S  175.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in Oklahoma. Seismic enhancement of the region is common near new moons. NEIC reported today's event was felt with maximum intensity VI in Oklahoma at Drummond; V in Meno and IV in Ringwood with II-III in Lahoma, Enid, Helena, Okeene, and Piedmont and in Kiowa, Kansas. The last earthquake of M>=3.9 in Oklahoma was an M 4.5 about 200 km northeast of today's epicenter on January 19, 2020 and prior to that an M 3.9 on September 16, 2019. Forecast 124338 had expected today's activity within about 50 km was likely around May 28.

 

O: 24MAY2020 15:21:31  36.4N   98.2W mb=2.7  EMSC   OKLAHOMA

O: 24MAY2020 14:53:59  36.4N   98.2W mb=3.8  EMSC   OKLAHOMA

O: 24MAY2020 14:53:59  36.4N   98.2W mb=3.9  ANSS   OKLAHOMA

O: 24MAY2020 13:19:13  36.5N   99.0W ML=2.4  EMSC   OKLAHOMA

O: 24MAY2020 16:06:47  36.5N   99.0W mb=2.4  EMSC   OKLAHOMA                     

P: 28MAY2020 124338    37.0N   98.0W 2.0-4.2 BAAAA  Southern Plains            

 

An M 3.8 also occurred in the Ridgecrest, California aftershock zone today. Maximum intensity IV was felt in Inyokern, Onyx, and Seqouia National Park with II-III in Ridgecrest, Trona, Kernville, Weldon, Lake Isabella, Bodfish and Wofford Heights, California. The last event in the Ridgecrest aftershock zone of larger magnitude was an M 4.0 on April 21, 2020. Forecast 124333 had expected today's event within about 10 km of the epicenter was likely around May 26.

 

O: 24MAY2020 23:25:07  35.7N  117.5W ML=2.0  EMSC   SOUTHERN CALIFORNIA          

O: 24MAY2020 12:55:08  35.9N  117.7W Mw=3.8  EMSC   CENTRAL CALIFORNIA

P: 26MAY2020 124333    35.9N  117.7W 2.5-4.7 AAAAA  So. California              

 

DERATELY STRONG QUAKE SHAKES CHIAPAS,  MEXICO

 

EARTHQUAKE SUMMARY FOR MAY 23, 2020

 

A moderately strong M 5.5 quake shook regions of Chiapas, Mexico and Guatemala today. The mainshock was reported by NEIC to have been felt as far as southern Texas. A foreshock of M 4.3 was reported felt with intensity IV in Tapachula, Chiapas, Mexico. An afershock of M 4.2 was felt in San Pablo la Laguna Solola, Guatemala. This summary had expected this area to be active at this time due to its distance (144 degrees) from the landfall of Tropical Cyclone Amphan in Bangladesh two days ago and its proximity to the maximum stress longitude of the current new moon as:

 

 

"The new moon arrives on May 22 at 17:38 UT. Areas which are sub-solar (local noon) at this time are near 85 West and those at local midnight at 95 East longitudes. These include Central and South America in the west and southeast Asia and Indonesia in the east. These area may see a strong earthquake due to tidal stresses in the next six days. Other areas may also be see enhanced seismicity at this time due to tidal stresses." (May 19-21, 2020)

 

"These epicenters (in Colombia and Nicaragua) are at 144-149 degrees from the landfall of Tropical Cyclone Amphan in the Bay of Bengal. This summary had expected this was possible in the previous issue as:

 

"TC Amphan (01B) continued today in the area south of Pakistan with winds up to 105 kts as a major cyclone. This is the strongest cyclone ever recorded in this area of the Bay of Bengal. It is expected to track to the north possibly affect seismicity in Bangladesh, eastern Pakistan and central and southeastern Asia in the next week. The antipode of the expected landfall is a about 21S 92W in the South Pacific - a non-seismic region. Areas at 144 degrees from the expected landfall include Mexico and Guatemala, those near 103 degrees include areas off Washington State and the Kermadec Islands. These may see seismic enhancement with landfall of this powerful storm." (May 18-20, 2020)

 

 

and

 

"A series of moderate quakes also shook areas of Chiapas and Guatemala today.

These may be related (as indicated above to the landfall of TC Amphan later today  in Bangladesh." (May 20, 2020)

 

Today's event of M 5.5 in Chiapas was accompanied by several moderate foreshocks and aftershocks. At M 5.5 it is the strongest event in Chiapas during 2020. Larger events most recently hit the area on December 23, 2019 (M 5.8) and November 20, 2019 (M 6.3). Much of today's activity was occurring around local solar midnight and was probably promoted by tidal stresses associated with recent new moon. Forecasts 124038 and 124263 had expected today's activity in Chiapas within about 50 km was likely between May 20 and 25. The mainshock occurred at 144 degrees from the landfall of TC Amphan as expected.

 

O: 24MAY2020 02:34:58  14.3N   93.2W ML=4.4  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 24MAY2020 05:53:08  14.8N   92.3W mb=4.2  EMSC   CHIAPAS, MEXICO

O: 23MAY2020 08:56:56  14.9N   93.7W mb=4.5  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 23MAY2020 07:00:05  15.7N   94.9W ML=3.9  EMSC   OFFSHORE OAXACA, MEXICO

O: 23MAY2020 08:12:12  15.8N   93.5W ML=3.8  EMSC   CHIAPAS, MEXICO

O: 24MAY2020 03:52:27  14.8N   93.7W Mw=5.5  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 20MAY2020 124038    15.0N   93.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

P: 25MAY2020 124263    14.0N   93.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

Note that the area of northern New Zealand from the Cook Strait to the Kermadec Islands is at 101-104 degrees from the landfall of TC Amphan. Earthquakes in  the past several days suggest activation of this area and a stronger event is possible in the next several days as well. This region is also at 100-103 degrees from the M 5.5 in Chiapas, Mexico, and from the M 6.5 in Nevada of May 15 increasing the likelihood a seismic enhancement at this time. A light earthquake of M 4.3 shook areas of North Island today. NEIC reported this earthquake of M 4.4 in North Island, New Zealand  was felt with intensity II-III in the area(s) of North Island, New Zealand at Te Puke, Bay of Plenty. This event had been anticipated in forecast 124440 to occur around May 25. This is the strongest quake in this area in more than two months - since an M 4.8 on March 15, 2020. This event is at 103 degrees from the landfall of TC Amphan and at 103 degrees from the M 6.5 in Southern Idaho of March 31 and was probably promoted by energy from those events.

 

O: 23MAY2020 22:40:02  37.7S  176.4E mb=4.3  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 23MAY2020 22:40:02  37.7S  176.5E mb=4.4  ANSS   NORTH ISLAND OF NEW ZEALAND  

P: 25MAY2020 124440    37.0S  177.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

The strongest seismicity in the world today occurred in the mid-Ocean Ridges. These events are not generally felt in these remote areas and these were no exception to this rule. The strongest today was an M 5.9 in the Southern Mid-Atlantic Ridge. This is the largest quake within about 200 km of this epicenter since an M 6.0 twenty years ago on October 21, 2000, the only other such event in the area in the past 30 years. Forecast 124223 had expected the area would be active in mid-May. The quake occurred near local solar midnight and could have been promoted by tidal stresses associated with the new moon.

 

O: 24MAY2020 02:52:26  47.4S   12.3W Mw=5.9  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P: 15MAY2020 124223    44.0S   16.0W 4.0-5.7 CCCAA  So. Mid-Atlantic Ridge     

 

The other mid-ocean activity of note today was a series of events in the southern Indian Ocean including an M 5.6. This activity is near the antipode of the M 6.1 in Baja California, Mexico which occurred yesterday and may have been promoted by antipodal concentration of energy from that event. This is the strongest event within about 250 km of this epicenter since an M 6.0 on July 19, 2017 and the largest within about 200 km since an M 5.7 on September 3, 2010, ten years ago. Forecast 124414 had expected today's activity within about 25 km  was likely around May 25. These epicenters are at 102 degrees from the M 7.6  in the Kurils of March 25 (like the activity in southern Puerto Rico) and may also have been promoted by energy from that source.

 

O: 23MAY2020 23:45:09  14.9S   66.7E mb=5.0  EMSC   MID-INDIAN RIDGE

O: 24MAY2020 00:28:00  14.9S   66.9E mb=5.1  EMSC   MID-INDIAN RIDGE

O: 23MAY2020 23:02:36  14.9S   66.7E Mw=5.6  EMSC   MID-INDIAN RIDGE             

P: 25MAY2020 124414    15.0S   67.0E 4.0-5.4 AAAAA  So. Indian Ocean           

 

The strongest earthquake in the U.S. or Canada today was an M 4.4-4.8 in the Kodiak Island region of Alaska. NEIC reported this earthquake of M 4.4 in Kodiak Island, Alaska  was felt with intensity II-III in the area(s) of Kodiak Island, Alaska. The only other event in the Kodiak region of Alaska with M>=4.8 in the past six months was an M 5.2-5.3 on April 17, 2020 and this may be an aftershock of that event. Forecast 124158 had expected activity in the area around May 21.

 

O: 23MAY2020 08:52:04  56.2N  154.5W mb=4.8  EMSC   KODIAK ISLAND REGION, ALASKA 

O: 23MAY2020 08:52:04  56.2N  154.5W mb=4.4  ANSS   KODIAK ISLAND REGION, ALASKA 

P: 21MAY2020 124158    54.8N  158.7W 3.5-5.0 ABBAA  Alaska Peninsula           

 

STRONG QUAKE SOUTH OF BAJA CALIFORNIA, MEXICO PROBABLY TIDALLY PROMOTED

 

EARTHQUAKE SUMMARY FOR MAY 22, 2020

 

The strongest earthquake in the world today was an M 6.1 south of Baja California. NEIC reported it was felt as far as 1000 km to the north in southern California. But likely intensities include IV in Los Cabos, Baja California Sur, Cabo San Lucas, Mazatlan, La Paz and Tlalnepantla, Mexico This event was likely promoted by tidal stresses from the new moon. When a foreshock of M 4.1 hit the same area yesterday, this summary noted in this regard:

 

 

"An unusual earthquake of M 4.1 also occurred today off the coast of Baja California. This is the strongest earthquake within about 100 km of this epicenter since an M 4.3 September 3, 2019. An M 5.8 about 200 km southwest of this occurred on August 14, 2019 and an M 4.1 about 150 km northwest occurred on February 19, 2019.  Forecast 124062 had expected this activity to the south was likely around May 19. This occurred near local solar noon and may indicate high stress in the area and further activity to come." (May 21-22, 2020)

 

The earthquake in Baja, Mexico is located at the third node (120 degrees) from the M 7.3 in the Banda Sea of May 6 and may have been promoted by energy from that source. It is the strongest earthquake within about 200 km of this epicenter since an M 6.2 on October 8, 2014 and prior to that an M 6.5 on October 3, 2002. The only event of similar magnitude to occur this far to the south in the region in the past 30 years was an M 6.1 on November 13, 2001.  Forecast 124062 had expected activity in this area was likely around May 19.

 

O: 22MAY2020 08:46:08  22.5N  107.9W Mw=6.1  EMSC   OFF COAST OF SINALOA, MEXICO 

P: 19MAY2020 124062    20.0N  109.0W 3.5-5.1 BCAAA  Gulf of California          

 

The largest earthquake in the U.S or Canada today was an M 5.2 west of Vancouver Island, British Columbia, Canada. NEIC reported intensity II-III felt within about 500 km of the epicenter at Ucluelet, and Walnut Grove, British Columbia. This epicenter is at 103 degrees from the M 7.3 of May 5 in the Banda Sea and was probably promoted by energy from that source. It was associated with the new moon today when tidal stresses were high and was probably enhanced by these tidal stresses as noted in previous issues of this report:

 

"The new moon arrives on May 22 at 17:38 UT. Areas which are sub-solar (local noon) at this time are near 85 West and those at local midnight at 95 East longitudes. These include Central and South America in the west and southeast Asia and Indonesia in the east. These area may see a strong earthquake due to tidal stresses in the next six days. Other areas may also be see enhanced seismicity at this time due to tidal stresses." (May 19-21, 2020)

 

This is the strongest earthquake within about 200 km of the epicenter since a series in late December, 2019 which included events of M 6.0, 6.0 and 6.3 near today's epicenter. The epicenter is located at 102 degrees from the M 7.3 in the Banda Sea of May 6, and like the M 5.5 of May 18, 2020  off the coast of Northern California at the same distance from the Banda Sea, was probably promoted by concentrated energy from that source. Forecast 124162 had expected today's event in this area was likely in mid-May.

 

O: 23MAY2020 02:14:50  50.4N  129.6W Mw=5.2  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 23MAY2020 02:14:50  50.4N  129.5W Mw=5.2  ANSS   VANCOUVER ISLAND, CANADA REGIO

O: 23MAY2020 02:14:52  50.4N  129.3W MB=4.9  ECAN of Port Alice, BC              

P: 15MAY2020 124162    50.7N  130.5W 3.0-4.9 CAAAA  British Colombia           

 

Moderate aftershocks continued in western Nevada today. The strongest of these were M 4.2 and 4.4 and were felt in the Tonopah and Hawthorne areas of Nevada with light intensity.

 

This summary continues to watch the region of Chiapas, Mexico for signs of

stronger seismicity. The area is at 144 degrees from the landfall of Tropical Cyclone Amphan in Bangladesh, a distance where seismic promotion is considered likely. It is also near the longitude of maximum tidal stress with this new moon and could be affected by those. Several moderate quakes hit the area today, but these are not unusual. These occurred near local solar midnight suggesting tidal influence.

 

O: 22MAY2020 07:15:14  14.6N   92.4W ML=4.3  EMSC   OFFSHORE CHIAPAS, MEXICO     

O: 23MAY2020 05:24:42  14.7N   93.8W ML=4.4  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 20MAY2020 124038    15.0N   93.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

NEW MOON ENHANCES AFTERSHOCK ACTIVITY IN IDAHO/CALIFORNIA/NEVADA

 

EARTHQUAKE SUMMARY FOR MAY 21, 2020

 

Significant aftershocks occurred today in the region of western Nevada (M 5.3 ); Idaho (M 4.4) and Hawaii (M 3.8). These events occurred with the new moon and were probably enhanced by tidal stresses associated with that alignment.

A moderate earthquake of M 4.8-5.3 shook western Nevada in the Tonopah area. This is the strongest aftershock to date of the M 6.5 of May 15. NEIC reported it was felt with intensity II-III within about 130 km of the epicenter at Silverpeak, Goldfield, Hawthorne, Tonopah and Yerington, Nevada and in California at Bishop, Big Pine, Lee Vining, June Lake, Mammoth Lake.  It was probably enhanced by stresses associated with the new moon which also arrived May 22. Forecast 124076 had expected today's activity was likely around May 18.

 

O: 22MAY2020 00:22:00  38.2N  117.8W Mw=4.8  EMSC   NEVADA                       

O: 22MAY2020 00:22:00  38.2N  117.8W Mw=5.3  ANSS   NEVADA                        

O: 21MAY2020 12:08:07  38.2N  117.9W ML=3.0  EMSC   NEVADA                       

P: 18MAY2020 124076    38.6N  118.6W 2.5-4.5 BAAAA  California/Nevada area     

 

A moderate M 4.4 aftershock also shook areas of Southern Idaho today. NEIC reported this was felt with intensity II-III in Idaho at Lowman, Cascade, Ketchum, Garden City, Boise, Emmett, Eagle and Council among others. The last  aftershock in the region of southern Idaho of the M 6.5 that shook the area on March 31 with M>=4.4  occurred on May 14 - also of M 4.4 and an M 4.6 on April 1, 2020, an immediate aftershock of the mainshock. Two light aftershocks of M 2.7 and 3.1 followed within minutes of local solar noon, an indication of tidal enhancement. Today's event was likely enhanced by tidal stresses associated with the new moon as noted in previous issues of this report:

 

"The new moon arrives on May 22 at 17:38 UT. Areas which are sub-solar (local noon) at this time are near 85 West and those at local midnight at 95 East longitudes. These include Central and South America in the west and southeast Asia and Indonesia in the east. These areas may see a strong earthquake due to tidal stresses in the next six days. Other areas may also be see enhanced seismicity at this time due to tidal stresses." (May 19-21, 2020)

 

Forecast 124134 had expected continuing aftershock activity in mid-May.

 

NEIC reported the earthquake of M 3.5  in Southern Idaho  was felt with intensity II-III in the area(s) of Southern Idaho in Stanley, Lowman, Challis, Boise, Meridian, and Rexburg.

 

O: 21MAY2020 23:35:46  44.3N  115.1W ML=3.5  EMSC   SOUTHERN IDAHO               

O: 21MAY2020 11:33:50  44.4N  115.2W ML=4.4  EMSC   SOUTHERN IDAHO

O: 21MAY2020 19:45:45  44.4N  115.3W ML=3.1  EMSC   SOUTHERN IDAHO

O: 21MAY2020 11:05:26  44.4N  115.3W ML=3.4  EMSC   SOUTHERN IDAHO

O: 21MAY2020 19:40:01  44.5N  115.2W ML=2.7  EMSC   SOUTHERN IDAHO

P: 17MAY2020 124134    44.4N  115.1W 2.0-4.0 BAAAA  Montana/Idaho              

 

An M 3.8 also shook areas of Hawaii today. This event was reported felt with maximum intensity IV in Papaikou, Hawaii and II-III in Hakalau, Volcano, Capatain Cook, Mountain View, Hilo, Kealakekua, Paauilo, Pahala and Naalehu. Several earthquakes of M 3.8 have occurred in Hawaii during May, but these on  May 6 and 12 were located in the Loi'hi Seamount area south of Hawaii about 50  km south of today's event. Today's epicenter is the first within 50 km  with such an event since an M 3.8  on March 21, 2020. The last of larger magnitude was an M 4.2 on February 3, 2020. Today's event occurred within minutes of local solar midnight and was probably promoted by tidal stresses associated with the new moon which maximize near  this hour. Forecast 124063 had expected today's activity around May 20.

 

O: 21MAY2020 10:42:45  19.2N  155.4W Ml=3.8  EMSC   ISLAND OF HAWAII, HAWAII     

P: 20MAY2020 124063    20.1N  156.1W 4.0-5.4 AAAAA  Hawaii area                

 

An unusual earthquake of M 4.1 also occurred today off the coast of Baja California. This is the strongest earthquake within about 100 km of this epicenter since an M 4.3 September 3, 2019. An M 5.8 about 200 km southwest of this occurred on August 14, 2019 and an M 4.1 about 150 km northwest occurred on February 19, 2019.  Forecast 124062 had expected this activity to the south was likely around May 19. This occurred near local solar noon and may indicate high stress in the area and further activity to come.

 

O: 21MAY2020 17:04:49  21.9N  108.2W mb=4.1  EMSC   OFF COAST OF BAJA CALIFORNIA S

P: 19MAY2020 124062    20.0N  109.0W 3.5-5.1 ABAAA  Gulf of California         

 

MODERATELY STRONG QUAKE SHAKES CENTRAL MEDITERRANEAN

 

EARTHQUAKE SUMMARY FOR MAY 20, 2020

 

The strongest earthquake in the world today was an M 5.7-5.8 south of Greece in the Mediterranean Sea. NEIC reported it was felt with intensity II-III in Benghazi, Libya; Grammenitsa, Greece, Sliema, Malta; Catania, Italy, and Fier, Albania among others. This epicenter south of Greece is somewhat unusual for an earthquake this size. The last event in the area within about 200 km of this epicenter with M>=5.8 was recorded on April 16, 2012. All the earthquakes in the area of M>=5.8 in the past 30 years have occurred about 100-200 km east of this epicenter with no such events to the west in this time frame. Forecast 124094 had expected this event in this area was likely around May 17. This appears to be part of the activation of the Anatolian Fault zone which has seen strong earthquakes in Crete, Greece in recent days. It is likely it is related to the events in Crete through stress redistribution.  These events have been occurring at 100-104 degrees from the M 7.3 in the Banda Sea and from the M 6.5 in Nevada of May 5 and May 15.  Today's event, which occurred near local solar midnight. The seismic forecast associated with the current new moon reads:

 

"The new moon arrives on May 22 at 17:38 UT. Areas which are sub-solar (local noon) at this time are near 85 West and those at local midnight at 95 East longitudes. These include Central and South America in the west and southeast Asia and Indonesia in the east. These areas may see a strong earthquake due to tidal stresses in the next six days. Other areas may also be see enhanced seismicity at this time due to tidal stresses." (May 19-21, 2020)

 

This event is located at the 6th node (60 degrees) from the landfall of TC Amphan in Pakistan and may have been promoted by energy from that source.

 

O: 20MAY2020 23:43:15  35.2N   20.2E mb=5.8  EMSC   CENTRAL MEDITERRANEAN SEA    

P: 17MAY2020 124094    36.0N   22.0E 3.0-4.4 BABAA  No. Greece                 

 

The strongest earthquake outside Alaska in the U.S. or Canada today was an M 5.0 aftershock in the Tonopah, Nevada area. NEIC reported maximum intensity IV in Silverpeak, Nevada with II-III felt in Nevada at Luning, Hawthorne, Round Mountain, Tonopah, Fallon, Gardnerville and Carson City and in California at Benton, Bishop. Following is a listing of events in the aftershock zone today of M>=3.5. A more extensive list of M>=3 can be found in the California/Nevada regional section of this summary.

 

O: 20MAY2020 12:36:53  38.2N  117.7W Mw=4.9  EMSC   NEVADA

O: 20MAY2020 12:36:53  38.2N  117.7W Mw=5.0  ANSS   NEVADA

O: 20MAY2020 09:46:16  38.1N  118.1W ML=4.0  EMSC   NEVADA

P: 18MAY2020 124076    38.6N  118.6W 2.5-4.5 BAAAA  California/Nevada area     

 

 

The strongest earthquake in Alaska today was an M 5.0 in the area south of Alaska. It was not reported felt in the area. Several moderate aftershocks followed including an M 4.6. This is a somewhat unusual epicenter. The last event of M>=5.0 within about 150 km of this epicenter was an M 5.0 on October 10, 2018 with a similar M 5.0 on February 23, 2018. The last event in the area with M>5 was an M 5.8 on May 31, 2016  - the largest in the past 30 years - and prior to that an M 5.5 on December 7, 2013. Forecast 124158 had expected today's activity within about 25 km was likely  between May 15 and 21.

 

O: 20MAY2020 19:38:19  54.6N  156.7W ML=3.1  EMSC   SOUTH OF ALASKA

O: 20MAY2020 20:54:53  54.6N  156.8W ml=3.1  EMSC   SOUTH OF ALASKA

O: 20MAY2020 17:13:20  54.9N  157.0W mb=5.0  EMSC   SOUTH OF ALASKA

O: 20MAY2020 17:18:23  55.0N  157.0W mb=4.6  EMSC   SOUTH OF ALASKA              

P: 15MAY2020 124158    54.7N  156.9W 3.5-4.9 BAAAA  Alaska Peninsula           

P: 21MAY2020 124158    54.8N  158.7W 3.5-5.0 AAAAA  Alaska Peninsula            

 

A series of moderate earthquakes hit the region of eastern Oaxaca, Chiapas, Mexico and Guatemala today. The strongest of these was an M 4.9 off the coast of Oaxaca, Mexico. NEIC reported this earthquake of M 4.9 in Oaxaca, Mexico  was felt with intensity II-III in the area(s) of  Tuxtla Gutierrez, Chiapas, Mexico.

This activity is located at 143-146 degrees from the landfall of Tropical  Storm Amphan which occurred today in Bangladesh, India and Pakistan. This is a distance at which energy is strongly concentrated following major surface events on the earth due to reflection of energy off the core boundaries. Strong triggering is not uncommon at this distance after major energy events such as earthquakes and strong ocean storm landfall. Previous issues of this summary had noted in this regard:

 

"TC Amphan (01B) made landfall today in the area of Bangladesh with winds up to 90 kts as a major cyclone. This is the strongest cyclone ever recorded in this area of the Bay of Bengal. It is expected to track to the north possibly affect seismicity in Bangladesh, eastern Pakistan and central and southeastern Asia in the next week. The antipode of the expected landfall is a about 21S 92W in the South Pacific - a non-seismic region. Areas at 144 degrees from the expected landfall include Mexico and Guatemala, those near 103 degrees include areas off Washington State and the Kermadec Islands. These may see seismic enhancement with landfall of this powerful storm$." (May 18-21, 2020)

 

O: 20MAY2020 20:52:45  13.3N   92.4W ML=3.9  EMSC   OFF THE COAST OF GUATEMALA   

P: 20MAY2020 124038    15.0N   93.0W 3.5-5.3 ABAAA  Chiapas, Mexico            

 

O: 20MAY2020 07:49:55  14.2N   91.3W mb=4.0  EMSC   GUATEMALA                    

P: 20MAY2020 124042    15.0N   91.0W 3.5-5.3 AAAAA  Guatemala                  

 

NEIC reported this earthquake of M 4.0 in Guatemala  was felt with intensity II-III in the area(s) of Guatemala at Palin Escuintla.

 

O: 20MAY2020 15:33:03  15.4N   94.8W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 21MAY2020 05:59:17  15.6N   94.8W mb=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 21MAY2020 04:28:57  15.7N   94.6W Mw=4.9  EMSC   OFFSHORE OAXACA, MEXICO

O: 20MAY2020 19:36:47  16.4N   94.7W ML=3.9  EMSC   OAXACA, MEXICO

O: 20MAY2020 21:11:08  15.1N   94.5W ML=3.9  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 18MAY2020 124053    16.0N   96.0W 3.5-5.3 AAAAA  Oaxaca, Mexico             

 

O: 20MAY2020 20:13:35  17.7N   93.9W ML=4.0  EMSC   VERACRUZ, MEXICO             

P: 17MAY2020 124039    17.0N   95.0W 3.5-5.4 AAAAA  Chiapas, Mexico            

 

MODERATE SEISMICITY IN CENTRAL AMERICA MAY BE PROMOTED FROM TC AMPHAN

 

EARTHQUAKE SUMMARY FOR MAY 19, 2020

 

The strongest earthquakes in the world today occurred with M 4.9 in Colombia and Nicaragua. These epicenters are at 144-149 degrees from the landfall of Tropical Cyclone Amphan in the Bay of Bengal. This summary had expected this was possible in the previous issue as:

 

"TC Amphan (01B) continued today in the area south of Pakistan with winds up to 105 kts as a major cyclone. This is the strongest cyclone ever recorded in this area of the Bay of Bengal. It is expected to track to the north possibly affect seismicity in Bangladesh, eastern Pakistan and central and southeastern Asia in the next week. The antipode of the expected landfall is a about 21S 92W in the South Pacific - a non-seismic region. Areas at 144 degrees from the expected landfall include Mexico and Guatemala, those near 103 degrees include areas off Washington State and the Kermadec Islands. These may see seismic enhancement with landfall of this powerful storm." (May 18-19, 2020)

 

The earthquakes in Nicaragua and Colombia also are consistent with tidal stress triggering associated with the upcoming New Moon as outlined in this and previous summaries:

 

"The new moon arrives on May 22 at 17:38 UT. Areas which are sub-solar (local noon) at this time are near 85 West and those at local midnight at 95 East longitudes. These include Central and South America in the west and southeast Asia and Indonesia in the east. These areas may see a strong earthquake due to tidal stresses in the next six days. Other areas may also be see enhanced seismicity at this time due to tidal stresses." (May 18-19, 2020)

 

The M 5.0 in Colombia was the strongest within about 200 km of that epicenter since an M 5.1 on April 2, 2020 and prior to that an M 6.1 on March 23, 2019. Forecast 124003 had expected today's activity was likely in this area around May 20.

 

O: 19MAY2020 07:18:59   5.9N   77.5W mb=5.0  EMSC   NEAR WEST COAST OF COLOMBIA  

O: 19MAY2020 07:18:00   5.9N   77.7W ML=4.7  EMSC   NEAR WEST COAST OF COLOMBIA  

P: 20MAY2020 124003     5.0N   78.0W 4.0-5.5 AAAAA  Colombia                   

 

The M 4.9 in Nicaragua was followed by an M 4.6 aftershocks and an M 4.1 foreshock to the south. The M 4.9 in the strongest event within about 100 km of this epicenter since an M 5.3 on January 24, 2020. An M 5.5 hit nearby on January 3, 2020. Forecast 124049 had expected today's activity was likely within this area around May 20.

 

NEIC reported an earthquake of M 4.9 in Nicaragua  was felt with intensity II-III in the area(s) of Nicaragua at Diriamba Carazo, Ticuantepe, Managua, Ciudad Sandino, San Juan, and in Antiguo Cuscatlan, El Salvador.

 

O: 19MAY2020 12:17:30  10.3N   86.4W ML=4.1  EMSC   OFF COAST OF COSTA RICA       

O: 20MAY2020 05:59:07  11.5N   86.7W mb=4.6  EMSC   NEAR COAST OF NICARAGUA      

O: 20MAY2020 03:30:37  11.5N   86.8W Mw=4.9  EMSC   NEAR COAST OF NICARAGUA      

P: 20MAY2020 124049    11.0N   86.0W 3.5-5.1 AAAAA  Nicaragua                  

 

A series of moderate quakes also shook areas of Chiapas and Guatemala today.

These may be related (as indicated above to the landfall of TC Amphan later today in Bangladesh. The areas had been forecast to be active around May 19-20 forecasts 124038 and 124042)

 

O: 20MAY2020 00:59:04  13.3N   90.9W mb=4.4  EMSC   OFFSHORE GUATEMALA           

P: 19MAY2020 124042    13.0N   91.0W 3.5-5.3 AAAAA  Guatemala                  

 

O: 20MAY2020 00:32:43  14.3N   94.1W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

O: 19MAY2020 20:04:41  15.1N   94.3W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

O: 20MAY2020 01:04:53  15.1N   94.3W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 20MAY2020 124038    15.0N   93.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

Aftershocks continued to be felt in western Nevada today. The strongest of these were in the M 4.0 range and were felt in Tonopah and Luning, Nevada. The strongest of M 4.6 was felt in Nevada at Gabbs, Tonopah, Glenbrock, and in California at Benton, Bishop and June Lake. Following is a listing of events of M>=3.5 in this area today. A more extensive list of today's aftershocks of M>=3 can be found in the California/Nevada regional section of this summary.

 

O: 20MAY2020 06:43:26  37.3N  115.4W ML=4.2  EMSC   NEVADA

O: 20MAY2020 03:49:21  38.2N  118.1W ML=3.5  EMSC   NEVADA

O: 19MAY2020 22:12:45  38.2N  117.8W Mw=4.4  EMSC   NEVADA

O: 19MAY2020 10:58:42  38.2N  117.8W ML=3.7  EMSC   NEVADA

O: 19MAY2020 09:48:50  38.2N  118.1W ML=3.7  EMSC   NEVADA

O: 19MAY2020 09:08:33  38.2N  117.8W mb=4.1  EMSC   NEVADA

P: 17MAY2020 124076    38.0N  118.8W 2.5-4.5 AAAAA  California/Nevada area     

 

 

Moderate sized aftershocks also continued off the coast of northern California

in two areas. An M 4.2 near the coast of Northern California was felt with intensity II-III in California at Ferndale, Petrolia, Loleta, Rio Dell, Fortuna, Bayside, Arcata and Garber among other coastal commumities. A foreshocks of M 2.6 was felt lightly in Eureka. An M 4.4 aftershock in the area farther to the west where the M 5.5 hit yesterday was also recorded.  This moderate aftershock off the coast of Northern California of M 4.4 was reported by NEIC to have been felt with intensity IV in Fortuna and II-III in Ferndale, McKinleyville, Blue Lake, Ukiah. Forecast 124142 had expected this activity was likely around May 16-20.

 

O: 19MAY2020 10:19:26  40.3N  124.0W Md=2.6  EMSC   NORTHERN CALIFORNIA          

O: 19MAY2020 15:58:28  40.4N  124.7W Mw=4.2  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 20MAY2020 124142    40.9N  124.3W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

O: 19MAY2020 07:10:08  40.8N  127.4W mb=4.4  EMSC   OFF COAST OF NORTHERN CALIFORN

P: 16MAY2020 124142    40.3N  127.2W 2.5-4.5 BAAAA  Off Coast of No. Calif     

 

Aftershocks also continued in the region of the eastern Mediterranean and Crete, Greece today. The strongest of these was an M 4.9. This activity is being lightly felt in Greece. It is located near 101-104 degrees from both the earthquakes in Nevada of May 15 and from the Banda Sea quake of May 6 and was probably promoted by energy from these sources. Other areas at similar distance to the Banda Sea include  the areas off the coast of Northern California which also saw continuing  enhanced seismicity today. The activity in Crete had been expected within about 100 km was likely around May 19 in forecast 124085.

 

O: 19MAY2020 17:55:28  34.1N   25.5E ML=4.1  EMSC   CRETE, GREECE

O: 19MAY2020 14:35:57  34.1N   25.5E mb=4.2  EMSC   CRETE, GREECE

O: 19MAY2020 14:58:29  34.1N   25.5E mb=4.4  EMSC   CRETE, GREECE

O: 20MAY2020 01:06:19  34.1N   25.6E mb=4.1  EMSC   CRETE, GREECE

O: 19MAY2020 19:09:14  34.1N   25.6E mb=4.6  EMSC   CRETE, GREECE

O: 19MAY2020 08:42:57  34.1N   25.7E mb=4.4  EMSC   CRETE, GREECE

O: 19MAY2020 23:23:24  34.2N   25.6E mb=4.1  EMSC   CRETE, GREECE

O: 19MAY2020 21:09:42  34.2N   25.6E mb=4.2  EMSC   CRETE, GREECE

O: 20MAY2020 02:12:18  34.2N   25.8E Mw=4.9  EMSC   CRETE, GREECE

O: 20MAY2020 06:11:18  34.3N   25.7E mb=4.4  EMSC   CRETE, GREECE

O: 19MAY2020 09:24:44  33.9N   25.6E mb=4.6  EMSC   EASTERN MEDITERRANEAN SEA    

P: 19MAY2020 124085    34.0N   24.0E 3.0-4.6 AAAAA  Crete                      

 

Other earthquakes near 103 degrees from Nevada today included an M 5.2 in Sichuan, China (104 degrees) and an M 4.3 in South Island, New Zealand (106 degrees) and in Afghanistan (M 4.1). These may also have been promoted by energy from Nevada. Forecast 124066 had expected the activity in China within about 200 km was likely around May 20. This was the strongest quake of the past 24 hours in the world.

 

O: 18MAY2020 13:48:03  27.3N  103.4E Mw=5.2  EMSC   SICHUAN-YUNNAN-GUIZHOU RG, CHI

O: 18MAY2020 20:35:57  27.5N  103.3E mb=4.5  EMSC   SICHUAN-YUNNAN-GUIZHOU RG, CHI

P: 20MAY2020 124066    28.0N  101.0E 4.0-5.5 AABAA  Myanmar                     

 

GEONET reported 45 people felt the earthquake in South Island with 35 with weak intensity; 9 with light intensity and 1 with moderate intensity. None reported strong shaking and 0 extreme intensity. Forecast 124222 had expected this activity around May 21.

 

O: 19MAY2020 22:40:49  45.0S  167.5E ML=4.3  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 19MAY2020 22:40:49  45.0S  167.5E ML=4.3  GEONET reported 45 people felt this quake

P: 21MAY2020 124222    44.0S  168.0E 3.0-5.1 AAAAA  So. Island, N.Z.           

 

O: 19MAY2020 12:03:37  37.0N   69.7E mb=4.1  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 15MAY2020 124086    36.0N   69.0E 3.8-5.4 BAAAA  Hindu Kush/Pakistan        

 

 

SEISMIC ENHANCEMENT AT 103-105 DEGREES FROM BANDA SEA

 

EARTHQUAKE SUMMARY FOR MAY 18, 2020

 

Strong seismic enhancement occurred today in the distance range of 103-105 degrees from the M 7.3 in the Banda Sea of May 6, the last major earthquake in the world. Today’s events at this distance included an M 5.8 in Crete and an M 5.5 off the coast of Northern California. This follows a highly unusual M 4.9 in northern Sweden as reported on in the last issue of this summary, also at 103 degrees from the Banda Sea as:

 

 

An unusual earthquake of M 4.9 hit northern Sweden today. NEIC reported it was felt with intensity V in Kiruna, Norrbotten, Sweden. This is the strongest earthquake in Northern Sweden within about 300 km of this epicenter in at least 30 years. The largest earthquakes previously recorded in the area are of M 4.9-5.2, similar to today's. The last of these was an M 5.2 about 300 km northwest of today's epicenter on September 3, 1981 and prior to that an M 4.9 on April 28, 1974. Seven earthquakes of M 4.9-5.2 have occurred within about 400 km of this epicenter in the catalog since 1894. This earthquake is located at 103 degrees from the Banda Sea quake of May 6, 2020 (M 6.8) and was probably promoted by energy from that event.

 

The strongest earthquake in the world today was an M 5.8 in the region of Crete, Greece where it was widely felt with light to moderate intensity. This event at 105 degrees from the Banda Sea was probably promoted by energy from that source. It was followed by a strong series of aftershocks and by several foreshocks including an M 5.0. These appear to be aftershocks of the M 6.6 in Crete of May 2, 2020. At the time this summary noted in regard to these events in Crete: 

 

"Today's earthquake in Crete is the strongest within about 200 km of that epicenter in at least 30 years. The area has been active in recent months with an M 5.8 to the east on January 30, 2020 and an M 6.0 on November 27, 2019. These events were more than 200 km from today's epicenter." (May 2-3, 2020)

 

Forecast 124085 had expected today's activity in Crete was likely around May 19.

 

O: 18MAY2020 23:22:34  34.1N   25.5E Mw=5.8  EMSC   CRETE, GREECE

O: 19MAY2020 02:48:48  34.1N   25.6E mb=4.2  EMSC   CRETE, GREECE

O: 19MAY2020 00:02:41  34.1N   25.6E mb=4.6  EMSC   CRETE, GREECE

O: 19MAY2020 00:35:20  34.1N   25.7E mb=4.1  EMSC   CRETE, GREECE

O: 18MAY2020 14:11:09  34.2N   25.6E mb=4.4  EMSC   CRETE, GREECE

O: 19MAY2020 02:44:19  34.3N   25.5E mb=4.2  EMSC   CRETE, GREECE

O: 19MAY2020 04:15:43  34.3N   25.6E mb=4.2  EMSC   CRETE, GREECE

O: 18MAY2020 11:48:07  34.1N   25.5E Mw=5.0  EMSC   CRETE, GREECE                

P: 19MAY2020 124085    34.0N   24.0E 3.0-4.6 AAAAA  Crete                      

 

A moderately strong earthquake off the coast of Northern California of M 5.3-5.5 was reported by NEIC to have been felt with intensity IV in Fortuna and II-III in Ferndale, McKinleyville, Blue Lake, Ukiah.

 

An M 4.2 off the coast of Northern California was felt with intensity II-III in California at Ferndale, Petrolia, Loleta, Rio Dell, Fortuna, Bayside, Arcata and Garber among other coastal communities. A foreshock of M 2.6 was felt lightly in Eureka.

 

In the previous issue of this summary following an M 4.7 foreshock to today's events, it had been noted that this area off the coast of northern California was likely to see increased seismicity at this time as:

 

"As noted in the previous issues of this summary, this appears to be part of an activation of the Mendocino Fault inland into the northwestern U.S. As such, major enhancement can be expected on the Mendocino escarpment off the coast of Northern California." (May 16-17, 2020)

 

"The last earthquake in this area off the coast of Northern California within about 100 km of this epicenter with M>=4.7 occurred on May 5, 2019 and prior to that events of M 4.9, 5.6 and 5.2 on July 24, 2018.  Forecast 124142 had expected today's event within about 50 km was likely around May 16. More such activity is likely in coming days." (May 17-18, 2020)

 

The last earthquake within about 100 km of this epicenter in northern California with M>=5.5 occurred on July 24, 2018 with M 5.6. This epicenter is at 104 degrees from the Banda Sea and at 51.4 degrees (node 7) from the M 7.6 in the Kurils of March 25 and may have been promoted by seismic energy from these sources.

 

O: 18MAY2020 06:56:01  40.8N  127.4W Mw=5.0  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 19MAY2020 07:10:08  40.8N  127.4W mb=4.4  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 18MAY2020 07:02:34  40.8N  127.3W Mw=5.3  EMSC   OFF COAST OF NORTHERN CALIFORN

O: 18MAY2020 07:02:34  40.8N  127.2W Mw=5.5  ANSS   OFF COAST OF NORTHERN CALIFORN

P: 16MAY2020 124142    40.3N  127.2W 2.5-4.5 AAAAA  Off Coast of No. Calif     

 

O: 19MAY2020 04:17:54  40.4N  124.9W ML=2.6  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 20MAY2020 124142    40.9N  124.3W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

Aftershocks continued to be felt in western Nevada today. The strongest of these were in the M 4.0 range and were felt in Tonopah and Luning, Nevada. The strongest of M 4.6 was felt in Nevada at Gabbs, Tonopah, Glenbrock, and in California at Benton, Bishop and June Lake. Today's aftershocks of M>=3 are listed below.

 

O: 19MAY2020 03:43:21  38.1N  117.9W ML=3.3  EMSC   NEVADA

O: 19MAY2020 02:13:32  38.2N  118.0W ML=3.3  EMSC   NEVADA

O: 18MAY2020 23:23:33  38.2N  117.9W ML=3.1  EMSC   NEVADA

O: 18MAY2020 21:51:01  38.2N  118.0W ML=3.0  EMSC   NEVADA

O: 18MAY2020 19:47:17  38.2N  117.9W ML=3.0  EMSC   NEVADA

O: 18MAY2020 19:47:17  38.2N  117.9W ML=3.0  EMSC   NEVADA

O: 18MAY2020 18:30:19  38.2N  118.1W ML=3.2  EMSC   NEVADA

O: 18MAY2020 11:29:24  38.2N  117.7W ml=3.3  EMSC   NEVADA

O: 18MAY2020 11:29:24  38.2N  117.7W ml=3.3  EMSC   NEVADA

O: 18MAY2020 09:45:55  38.2N  118.0W ML=3.4  EMSC   NEVADA

O: 18MAY2020 08:44:57  38.2N  117.8W ml=3.0  EMSC   NEVADA

O: 18MAY2020 08:05:15  38.2N  117.8W ml=3.0  EMSC   NEVADA

O: 18MAY2020 07:53:57  38.2N  117.9W ml=3.1  EMSC   NEVADA

O: 18MAY2020 07:53:57  38.2N  117.9W ml=3.1  EMSC   NEVADA

O: 19MAY2020 03:43:21  38.1N  117.9W ML=3.3  EMSC   NEVADA                       

P: 16MAY2020 124076    37.3N  118.3W 2.5-5.6 BAAAA  California/Nevada area     

P: 17MAY2020 124076    38.0N  118.8W 2.5-4.5 AAAAA  California/Nevada area     

P: 18MAY2020 124076    38.6N  118.6W 2.5-4.5 AAAAA  California/Nevada area     

 

MODERATE, UNUSUAL  QUAKE SHAKES SWEDEN

 

EARTHQUAKE SUMMARY FOR MAY 17, 2020

 

An unusual earthquake of M 4.9 hit northern Sweden today. NEIC reported it was felt with intensity V in Kiruna, Norrbotten, Sweden. This is the strongest earthquake in Northern Sweden within about 300 km of this epicenter in at least 30 years. The largest earthquakes previously recorded in the area are of M 4.9-5.2, similar to today's. The last of these was an M 5.2 about 300 km northwest of today's epicenter on September 3, 1981 and prior to that an M 4.9 on April 28, 1974. Seven earthquakes of M 4.9-5.2 have occurred within about 400 km of this epicenter in the catalog since 1894. This earthquake is located at 103 degrees from the Banda Sea quake of May 6, 2020 (M 6.8) and was probably promoted by energy from that event.

 

O: 18MAY2020 01:11:57  67.8N   20.1E mb=4.9  EMSC   SWEDEN                       

 

An M 4.7 occurred off the coast of Northern California today. It was not reported felt but was probably lightly felt on the mainland near Eureka. This is consistent with regional seismic promotion associated with the M 6.5 in Nevada of May 15 as noted in the previous issue of this report:

 

"As noted in the previous issues of this summary, this appears to be part of an activation of the Mendocino Fault inland into the northwestern U.S. As such, major enhancement can be expected on the Mendocino escarpment off the coast of Northern California." (May 16-17, 2020)

 

The last earthquake in this area off the coast of Northern California within about 100 km of this epicenter with M>=4.7 occurred on May 5, 2019 and prior to that events of M 4.9, 5.6 and 5.2 on July 24, 2018.  Forecast 124142 had expected today's event within about 50 km was likely around May 16. More such activity is likely in coming days.

 

Like the earthquake in Sweden, this epicenter is at 103-104 degrees from the

M 6.8 in the Banda Sea of May 6, 2020 and was probably promoted by energy

from that source. An M 5.3 in Crete was also located at 103 degrees from the Banda Sea epicenter.

 

O: 18MAY2020 06:56:02  40.8N  127.4W mb=4.7  EMSC   OFF COAST OF NORTHERN CALIFORN

P: 16MAY2020 124142    40.3N  127.2W 2.5-4.5 AAAAA  Off Coast of No. Calif     

 

The strongest aftershock in the Nevada area today was an M 4.7. NEIC reported it was felt with intensity IV in Luning, Nevada and II-III in Gabbs, Hawthorne, Tonopah, and in California at Bishop, Coleville and Three Rivers. This is the strongest non-immediate aftershock in the area to date. Following is a listing of events of M>=4.0 today in the Nevada aftershock zone. A similar listing of events of M>=3 can be found in the California/Nevada regional section in this summary below. Forecast 124076 had expected this activity was likely around May 16-17.

 

O: 18MAY2020 02:19:07  38.2N  118.1W Mw=4.0  EMSC   NEVADA                       

O: 18MAY2020 02:19:07  38.2N  118.1W Mw=4.0  EMSC   NEVADA

O: 17MAY2020 21:47:44  38.2N  118.1W mb=4.3  EMSC   NEVADA

O: 17MAY2020 21:17:02  38.2N  117.8W Mw=4.7  ANSS   NEVADA

O: 17MAY2020 21:17:01  38.2N  117.8W Mw=4.1  EMSC   NEVADA

O: 17MAY2020 11:53:52  38.2N  117.9W Mw=4.3  EMSC   NEVADA

P: 16MAY2020 124076    37.3N  118.3W 2.5-5.6 AAAAA  California/Nevada area     

P: 17MAY2020 124076    38.0N  118.8W 2.5-4.5 AAAAA  California/Nevada area     

 

AFTERSHOCKS CONTINUE IN NEVADA

 

EARTHQUAKE SUMMARY FOR MAY 16, 2020

 

Seismicity continued to be dominated by aftershocks of the M 6.5 in Nevada which occurred on May 15. A number of these aftershocks were lightly felt in the area of Tonopah today. The strongest of today's aftershocks was an M 4.6 which was felt with maximum intensity IV in Pioneer, California and II-III in Nevada at Hawthorne, Tonopah, Fernley, Glenbrook, Reno. Far-field triggering may occur at nodal distances and at or near 103 and 144 degrees from this epicenter.  But this event is on the low end of those likely to trigger significant far-field activity and the Ridgecrest events of last year are not far from today's epicenter. Much of the likely far-field activity may have already been promoted by these earlier regional events in California. Areas near 103 degrees from this event in Nevada which are seismic include Papua New Guinea, New Zealand, Central Asia, the Pacific-Antarctic Ridge, the Philippines and Taiwan and eastern Turkey. Little seismicity at 144 degrees is likely - a distance which includes the Indian Ocean and the East African Rift Valley. Regional activity, however is another matter. As noted in the previous issues of this summary, this appears to be part of an activation of the Mendocino Fault inland into the northwestern U.S. As such, major enhancement can be expected on the Mendocino escarpment off the coast of Northern California. Also, the first of the Dixie Valley earthquakes in the summer of 1954 was followed by similar or larger events of M>=7 in the next six months on two occasions. The basin and range tectonic regime in this area probably encourages series of large but not great quakes and this is a possibility throughout the remainder of 2020. The end of May is a prime time for significant activity in this region of California and Nevada. The series of M>=6 events in 1980 occurred in late May in the Mammoth Lakes area. Also, in addition to the M 5.6 on May 15, 1999 in the area of the current activity an M 6.2 and 5.1 hit the region on May 17, 1993. This summary describes these as:

 

Minor damage at Independence and Lone Pine California. Felt throughout a large area of California and Nevada from San Francisco to Carson City, Ely and Las Vegas, Nevada. A large rockslide occurred about 7 km east of Eureka Valley Sand Dunes.

 

 5 17 23 20 49 1993  37.171 -117.775   7 6.2   California/Nevada area

 5 17 23 36 10 1993  37.145 -117.780  13 5.1   California/Nevada area

 

A listing of aftershocks in Nevada today of M>=3.5 follows, those of M>=3 can be found in the California regional section of this report below.

 

O: 17MAY2020 08:28:48  38.2N  117.9W Mw=3.8  EMSC   NEVADA

O: 17MAY2020 06:42:02  38.2N  117.8W ML=3.6  EMSC   NEVADA

O: 16MAY2020 23:27:13  38.1N  118.0W Mw=4.1  EMSC   NEVADA

O: 16MAY2020 11:54:23  38.2N  117.7W ML=3.6  EMSC   NEVADA

O: 16MAY2020 11:50:53  38.2N  117.7W mb=4.4  EMSC   NEVADA

O: 16MAY2020 11:49:30  38.2N  117.7W ML=3.6  EMSC   NEVADA

O: 16MAY2020 10:28:40  38.2N  117.9W ML=4.0  EMSC   NEVADA

P: 17MAY2020 124076    38.0N  118.8W 2.5-4.5 AAAAA  California/Nevada area     

 

An impressive series of moderate earthquakes occurred today in the western Fox Islands, Aleutians. The strongest of these was an M 4.9 but the series also included events of M 4.7, 4.7, 4.5 and 4.5. These are located near the ninth node (40 degrees) from the M 6.5 in Nevada of May 15 and may have been enhanced by energy from that source. The only earthquakes of larger size in the area in the past half year were an M 5.8 on October 26, 2019 and an M 5.0 on January 13, 2020. An M 4.6 on April 20, 2020 was the last similar regional event. Forecast 124164 had expected today's activity was likely within about 25 km around May 19.

 

O: 17MAY2020 05:35:13  51.8N  169.2W ML=3.8  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 17MAY2020 05:42:25  51.8N  169.2W mb=3.8  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 17MAY2020 05:52:47  52.0N  169.2W mb=3.7  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 16MAY2020 19:22:30  52.0N  169.4W mb=4.7  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 16MAY2020 16:06:53  52.1N  169.3W mb=4.7  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 17MAY2020 05:26:33  52.2N  169.4W mb=4.9  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 16MAY2020 10:06:07  52.2N  169.5W mb=4.5  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 16MAY2020 19:23:33  52.2N  169.6W mb=4.5  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

P: 19MAY2020 124164    51.9N  169.2W 3.5-5.3 AAAAA  Fox Islands, Aleutians     

 

A strong tropical Cyclone exploded in the area south of eastern Pakistan today. This storm is described in this summary as:

 

TC Amphan (01B) continued today in the area south of Pakistan with winds up to 170 kts as a major cyclone. It is expected to track to the north possibly affect seismicity in eastern Pakistan and central and southeastern Asia in the next week.

 

The antipode of this is near the east Pacific Rise with the area near 103 degrees distance passing near Tonga, Fiji, New Zealand and Hawaii. Areas at 144 degrees are located in northern Central America and the Caribbean. These may see enhanced seismicity as TC Amphan makes landfall later this week.

 

Regional seismicity which may have been promoted by energy from Amphan today included an M 4.7 in Myanmar and an M 4.6 in the Delhi region of India.

 

O: 17MAY2020 04:32:15  20.5N   96.1E mb=4.7  EMSC   MYANMAR                      

P:  7MAY2020 123812    25.0N   97.0E 4.0-5.5 CCAAA  Myanmar                    

 

O: 16MAY2020 09:19:01  28.6N   76.7E MB=4.6  EMSC   HARYANA - DELHI REGION, INDIA

P: 21MAY2020 124087    30.0N   79.0E 3.8-5.2 BBBAA  India                      

 

STRONG QUAKE SHAKES NEVADA-CALIFORNIA BORDER

 

EARTHQUAKE SUMMARY FOR MAY 15, 2020

 

A strong earthquake of M 6.5 hit the area near the California-Nevada border today. NEIC reported maximum intensity VI in Benton, California; V in Silverpeak, Hawthorne, Babbs, and Round Mountain, Nevada; IV in Luning, Goldfield, Nevada and Bishop and Lee Vining, California and III in Big Pine, California among others. It was reported felt lightly as far as Arizona, Oregon, Idaho, Utah and Los Angeles, California. No major damage was reported but portions of U.S. 95 had to be shut down due to cracking in the pavement. The timing of this earthquake may have been related to tectonic plate motions induced by landfall of the first typhoon (Vongfong)  of the season in central Philippines which was simultaneous with this event in Nevada. This may be part of the recent activation of the area as described in this summary following the M 6.5 in Idaho of March 31:

 

 

"The earthquakes in Salt Lake City, Utah and Idaho are around 8 degrees from the

M 7.1 in Ridgecrest, California of July 6, 2019. A stress pulse from that event may be considered a possibility for distant triggering in both cases. A series of earthquakes near the Mendocino fault zone and inland near 40-44 degrees north latitude have occurred in the past two weeks. This summary had speculated that these were related and the earthquake in Idaho tends to reinforce that speculation. This had been noted shortly after the Utah event as:

 

"This may be part of the activation of the Mendocino fault zone inland between 39 and 41 North  Latitude. This has recently include events of M 5.8 off Northern California, an M 5.7 in Salt Lake City, Utah and a number of M>=4 events in northern California." (March 21, 2020, April 1, 2020)

 

WHY NOW:

 

While it is clear from the activity on and following April 11, that the area near the M 6.5 today was ripe for a larger earthquake, it is useful to identify  the specific geophysical phenomena which may have promoted today's event at  this time. These include: 1) The most prominent of these is Typhoon Vongfong. This is the first typhoon of the season and made landfall in Luzon, Philippines on May 14-15, 2020. at 14N 122E nearly simultaneous with the earthquake in Nevada. The distance between these two events is 103 degrees as noted in the previous issue of this summary:

 

TYPH   (Vongfong) VONGFONG 2020-05-15  00:00 UT  14.1N  121.9E   75 kts  East of Central Philippines

 

This summary has previously argued that strong surficial energy sources such as hurricanes, typhoons and earthquakes may trigger action at a distance because energy is reflected off the core-mantle boundary and is concentrated near 103 degrees distance from these events on the surface as noted in this summary on October 11, 2018 for example:

 

"Earthquake motions associated with landfall could enhance seismicity at distances similar to those associated with strong earthquakes and other energetic surficial phenomena. The two events - landfall and earthquakes occurred simultaneously." (October 11, 2018)

 

and

 

"Seismic energy from strong surficial activity on the earth reflects off the core-mantle boundary is redirected  to the surface near 103 degrees from the  mainshock. Seismicity often increases in this distance range following and may be triggered or promoted from the distant source." (June 9, 2018)

 

2) A strong storm, possibly the first tropical depression of the Hurricane Season also hit southern Florida on May 15. The first  storms of the season are particularly importance in releasing energy that has been stored and is ready for release. 3) A nor'easter about a week ago hit the northeastern U.S. It brought with it the latest measurable snowfall to Portland, Maine since 1966. This summary, most recently in relation to the activity of April 11 in Mammoth Lakes, California made a case that such storms can affect seismicity in this area. 4) Regional seismicity and the Ridgecrest M 7.1 of July 6, 2019 indicate unstable seismic conditions at this time in the area. Moderate to strong quakes in Utah and Southern Idaho probably affected the Nevada area by redistributing stress. A strong M 6.8 also occurred in northeastern Turkey in late January and was located at 102 degrees from today's activity. Energy from this source may also have contributed to the timing of today's Nevada quake.  The combination of these effects may have promoted the Nevada earthquake to occur at this time.

 

When the activity of April 11 in the general region of Mammoth Lakes occurred this summary noted:

 

"The strongest earthquake in the U.S. or Canada today was an M 5.2 which was felt widely in the Mammoth Lakes region of Central California and Nevada. NEIC reported maximum intensity IV in California at Benton, June Lake, and Yosemite National Park and in Luning Nevada. Intensity II-III was felt within about 100 km of the epicenter in California at Bishop, Coleville, Mammoth Lakes, Bridgeport and Lee Vining, and in Hawthorne, Nevada. A series of moderate aftershocks followed including an M 4.5. This is the strongest earthquake within the state of California since the M 7.1 Ridgecrest earthquake of July 6, 2019. An M 5.8 hit off the coast of California on March 9, 2020 and two events of M 5.2 each hit off the northern coast on March 18, 2020 and October 28, 2019.

It is also the strongest in the general area of eastern California and Nevada since an M 5.8 on December 28, 2016 about 40 km north of today's epicenter in Nevada. Prior to that an M 5.4-5.5 hit near today's epicenter on September 18, 2004. The possibility of a moderate quake in this area at this time has been discussed in previous issues of this summary, for example in yesterday's summary it was noted:

 

"A nor'easter hit yesterday in the area of the northeastern U.S. dropping up to 20 inches of snow in some portions of northern New England. This summary noted the likelihood of a moderate earthquake in California with storms of this type in a previous  issue as:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Mammoth Lakes, California area. NEIC reported intensity III-IV in Mammoth Lakes and northeast Fresno County and II-III within about 100 km at June Lake, Benton, Bishop, Shaver Lake, Oakhurst, Bass Lake and Yosemite.  This may be related to the strong nor'easter which was simultaneous with the M 4.9 in Southern California yesterday. A pair of light earthquakes were also felt in the San Francisco area today with M 2.4 and 2.7. California may be heading into a period of high seismicity which generally lasts from mid-April to early May and can include moderate to strong quakes near the coast. Researchers have suggested this seasonal pattern may be related to weather, percolation and rainfall. The largest event in this period in the State was an M 8.3 in San Francisco in 1906. Weather was factor in that event, although not a strong nor'easter, weather maps from this date show a strong low pressure system over the area with winds to the northeast, typical of a nor'easter. While details cannot be found the strongest snowfall event in the northeastern U.S. occurred about a week before the San Francisco earthquake - for example, measuring 15 inches on April 10 in Portland, Maine, the largest snowfall in April ever recorded. This was probably part of a regional nor'easter. More directly associated with this northeastern U.S. weather event was an M 7.5, also on April 10, 1906 in the Gulf of California - a direct precursor to the San Francisco quake. A felt foreshock to that event occurred 10 hours after the Gulf of California event in San Francisco of unknown magnitude. Unusual local winds from the east were blowing when the earthquake occurred. These strange winds were one of the prime causes of the massive fire which followed the earthquake. A strong storm dumped inches of snow in the Mammoth Lakes region today and may have helped promote this unusual earthquake of M 4.4." (April 6, 2020)

 

Like the event of April 5, a strong snowstorm also hit eastern California today. " (April 10-11, 2020)

 

This activity is located at 101 degrees from the M 6.8 in eastern Turkey of January 24 and at the sixth node (60 degrees) from the M 7.7 in the Kuril Islands of March 25 and was probably promoted by energy from those sources." (April 11-12, 2020)

 

Coincidentally, a moderately strong earthquake  hit the region exactly 21 years ago on May 15, 1999. It  was described in this summary as:

 

" 5 15 13 22 13 1999  37.494 -118.617   0 5.6   California/Nevada area

 

Small items knocked from shelves in the epicentral area. Felt in many parts of central California as far north as Placerville as far south as Valencia. Followed by a M4.6 aftershock" (May 14-15, 2020)

 

Today's event of M 6.5 is the strongest within about 100 km of this epicenter in the California-Nevada border region since the Mammoth Lakes, California swarms of M 6.5-6.7 on May 25, 1980 and July 21, 1986 and the largest in Nevada since an M 7.2 on December 16, 1954 - part of a series beginning on July 6, 1954 (M 6.8) and August 24, 1954 (M 6.8). Other similar events have rocked this area on December 21, 1932 and in 1852 and 1872, Among others, forecast 124076 had expected today's event was likely in this area around May 16. Following is a list of mainshock and aftershocks of M>=4 today. A more complete listing of events of M>=3 can be found under California region section below.

 

 

O: 16MAY2020 04:12:20  38.1N  118.0W mb=4.2  EMSC   NEVADA

O: 15MAY2020 22:15:49  38.2N  118.0W mb=4.2  EMSC   NEVADA

O: 15MAY2020 17:50:16  38.2N  117.8W mb=4.4  EMSC   NEVADA

O: 15MAY2020 17:50:16  38.2N  117.8W mb=4.4  EMSC   NEVADA

O: 15MAY2020 15:23:24  38.2N  117.8W mb=4.6  EMSC   NEVADA

O: 15MAY2020 15:23:24  38.2N  117.8W mb=4.6  EMSC   NEVADA

O: 15MAY2020 13:02:11  38.2N  117.8W ML=4.2  EMSC   NEVADA

O: 15MAY2020 12:00:40  38.2N  117.8W mb=4.0  EMSC   NEVADA

O: 15MAY2020 11:52:06  38.2N  117.9W mb=4.2  EMSC   NEVADA

O: 15MAY2020 11:30:17  38.2N  118.0W ML=4.2  EMSC   NEVADA

O: 15MAY2020 11:26:02  38.2N  117.9W Mw=4.9  EMSC   NEVADA

O: 15MAY2020 11:18:12  38.2N  117.9W ML=4.7  EMSC   NEVADA

O: 15MAY2020 11:17:26  38.1N  118.2W ML=4.6  EMSC   NEVADA

O: 15MAY2020 11:03:28  38.2N  117.9W Mw=6.5  EMSC   NEVADA                       

P: 16MAY2020 124076    37.3N  118.3W 2.5-5.6 AAAAA  California/Nevada area     

P: 17MAY2020 124076    38.0N  118.8W 2.5-4.5 AAAAA  California/Nevada area     

 

O: 15MAY2020 11:03:28   38.2N  117.9W Mw=6.5  EMSC   NEVADA                       

P: 16MAY2020 124076    37.3N  118.3W 2.5-5.6 AAAAA  California/Nevada area     

 

 

 

 

 

LARGE EARTHQUAKE REPORTED ON NEVADA-CALIFORNIA BORDER

 

EARTHQUAKE SUMMARY FOR MAY 14, 2020

 

Late reports indicate that an M 6.5 earthquake has occurred near Tonopah, Nevada east of Mammoth Lakes, California. Information about this earthquake is preliminary and will be dealt with in more detail in the next issue of this summary. The event is in a sparsely populated area and it is likely that only light to moderate  damage occurred. The last earthquake of M>=6.5 in this area occurred more than 30 years ago but the last of M>=6 was an M 6.1 on May 17, 1993. The area has been active, however, since the M 7.1 in Ridgecrest, California on July 6, 2019. The last significant activity near this location occurred in April  when an M 5.2 occurred in the general area. This summary noted that event as:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 5.2 which was felt widely in the Mammoth Lakes region of Central California and Nevada. NEIC reported maximum intensity IV in California at Benton, June Lake, and Yosemite National Park and in Luning Nevada. Intensity II-III was felt within about 100 km of the epicenter in California at Bishop, Coleville, Mammoth Lakes, Bridgeport and Lee Vining, and in Hawthorne, Nevada. A series of moderate aftershocks followed including an M 4.5. This is the strongest earthquake within the state of California since the M 7.1 Ridgecrest earthquake of July 6, 2019. An M 5.8 hit off the coast of California on March 9, 2020 and two events of M 5.2 each hit off the northern coast on March 18, 2020 and October 28, 2019. It is also the strongest in the general area of eastern California and Nevada since an M 5.8 on December 28, 2016 about 40 km north of today's epicenter in Nevada. Prior to that an M 5.4-5.5 hit near today's epicenter on September 18, 2004. The possibility of a moderate quake in this area at this time has been discussed in previous issues of this summary, " (April 12, 2020)

 

The M 5.8 on December 28, 2016 may be near today's epicenter and may be precursory to it. The entire region has seen active seismicity in recent  months including the M 6.5 in Idaho on March 31 and an M 5.7 in Utah in late March. An M 4.8 in Southern Idaho yesterday may have indicated strong regional stresses

at this time. This summary noted this event as:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.4-4.8 in the  southern Idaho aftershock zone of the March 31, 2020 M 6.5. NEIC reported today's earthquake was felt with maximum intensity IV in Idaho at Lowman and Horseshoe Bend and II-III in Stanley, Cascade, Garden Valley, McCall, Idaho City, Ketchum, Challis and Ellis. This is the strongest aftershock of the M 6.5 in southern Idaho since an immediate aftershock of M 4.8 on April 1. The last aftershock of M>=4.4 was an M 4.6 on April 11, 2020 more than a month ago. The area continues to see active conditions and more such activity is likely." (May 14, 2020)

 

More will be found in the succeeding issues of this summary. Light earthquakes today in this region included:

 

O: 14MAY2020 21:05:18  36.4N  118.0W Ml=2.1  EMSC   CENTRAL CALIFORNIA           

O: 14MAY2020 17:43:14  36.5N  118.0W Ml=2.0  EMSC   CENTRAL CALIFORNIA           

P: 16MAY2020 124075    37.1N  117.8W 2.5-5.8 AAAAA  California/Nevada area     

 

O: 14MAY2020 08:17:59  37.5N  118.9W Md=2.4  EMSC   CENTRAL CALIFORNIA           

O: 14MAY2020 08:25:49  37.5N  118.9W Md=2.5  EMSC   CENTRAL CALIFORNIA           

P: 16MAY2020 124076    37.3N  118.3W 2.5-5.6 AAAAA  California/Nevada area     

 

O: 14MAY2020 22:38:22  38.0N  118.8W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P:  8MAY2020 123823    38.0N  118.8W 2.5-4.4 CAAAA  California/Nevada area     

P: 17MAY2020 124076    38.0N  118.8W 2.5-4.5 BAAAA  California/Nevada area     

 

It was a quiet day in global seismicity. No earthquake of M>=5 were reported and seismicity in the U.S. and Canada was low.

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the central

Andreanof Islands. It was not reported felt in this remote area. The last event within about 100 km of this epicenter in the Andreanof Islands with M>=4.5 was an M 4.8 on March 24, 2020.  Forecast 124160 had expected today's event in this area around May 15.

 

O: 15MAY2020 06:51:22  50.5N  175.9W mb=4.5  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 15MAY2020 124160    51.7N  176.4W 3.5-5.3 ABAAA  Andreanoff Isls, Aleutians 

 

A moderate earthquake of M 4.4 shook the Dominican Republic today. It occurred in the northern portion of the Island. This is the largest earthquake in the northern Dominican Republic within about 100 km of this epicenter since a similar M 4.4 on November 11, 2018. The last of larger magnitude was an M 5.2 on September 23, 2018. It was accompanied by a series of forecshocks and aftershocks the largest of M 3.9 but with many in the M 3-4 range. Forecast 124056 had expected today's activity was likely around May 17.

 

NEIC reported this earthquake of M 4.4 in the Dominican Republic  was felt with intensity II-III in the area(s) of the Dominican Republic at Puerto Plata, Santiago, Bayamon.

 

 

O: 14MAY2020 08:34:10  19.8N   71.1W ML=3.0  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 09:27:48  19.8N   71.1W ML=3.0  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 09:37:33  19.8N   71.1W ML=3.0  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 21:40:12  19.8N   71.1W ML=3.0  EMSC   DOMINICAN REPUBLIC

O: 15MAY2020 03:00:45  19.8N   71.1W ML=3.0  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 18:38:01  19.8N   71.1W ML=3.3  EMSC   DOMINICAN REPUBLIC

O: 15MAY2020 03:27:18  19.8N   71.1W ML=3.3  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 22:41:33  19.8N   71.1W ML=3.4  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 18:35:15  19.8N   71.1W ML=3.5  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 21:54:59  19.8N   71.1W ML=3.6  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 21:03:57  19.8N   71.1W mb=4.4  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 07:11:39  19.9N   70.9W ML=3.0  EMSC   DOMINICAN REPUBLIC REGION

O: 14MAY2020 14:24:51  19.9N   71.1W ML=3.9  EMSC   DOMINICAN REPUBLIC REGION

O: 15MAY2020 04:10:41  19.6N   70.4W ML=3.5  EMSC   DOMINICAN REPUBLIC            

P: 17MAY2020 124056    19.0N   71.0W 3.4-5.1 AAAAA  Puerto Rico                

 

UNUSUAL, MODERATE QUAKES SHAKE IDAHO, SOUTHERN AUSTRALIA, MADAGASCAR

 

EARTHQUAKE SUMMARY FOR MAY 13, 2020

 

The strongest earthquake in the U.S. or Canada today was an M 4.4-4.8 in the southern Idaho aftershock zone of the March 31, 2020 M 6.5. NEIC reported today's earthquake was felt with maximum intensity IV in Idaho at Lowman and Horseshoe Bend and II-III in Stanley, Cascade, Garden Valley, mncCall, Idaho City, Ketchum, Challis and Ellis. This is the strongest aftershock of the M 6.5 in southern Idaho since an immediate aftershock of M 4.8 on April 1. The last aftershock of M>=4.4 was an M 4.6 on April 11, 2020 more than a month ago. The area continues to see active conditions and more such activity is likely. Forecast 123891 had expected today's event in early to mid-May.

 

O: 13MAY2020 11:32:58  44.3N  115.2W Ml=2.3  EMSC   SOUTHERN IDAHO

O: 13MAY2020 09:04:21  44.4N  114.9W Ml=3.7  EMSC   SOUTHERN IDAHO

O: 13MAY2020 18:36:26  44.4N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 13MAY2020 22:36:47  44.4N  115.2W ML=3.6  EMSC   SOUTHERN IDAHO

O: 13MAY2020 08:17:42  44.4N  115.2W Ml=3.6  EMSC   SOUTHERN IDAHO

O: 14MAY2020 00:21:54  44.4N  115.2W Ml=4.8  EMSC   SOUTHERN IDAHO

O: 13MAY2020 18:30:01  44.4N  115.3W ML=2.7  EMSC   SOUTHERN IDAHO

O: 13MAY2020 17:29:45  44.5N  115.3W ML=2.5  EMSC   SOUTHERN IDAHO

O: 13MAY2020 19:18:42  44.5N  115.3W Ml=2.9  EMSC   SOUTHERN IDAHO

O: 14MAY2020 01:28:48  44.3N  115.0W Ml=3.2  EMSC   SOUTHERN IDAHO               

P:  8MAY2020 123891    44.5N  115.1W 2.0-4.0 CAAAA  Montana/Idaho              

 

The most unusual earthquake of the day was an M 4.8 in Madagascar. NEIC reported this M 4.8 was felt with intensity II-III in Madagascar at Antsirabe, Fianarantsoa, Antananarivo and Vavatenina. This is the strongest earthquake in Madagascar since an M 5.5 on January 11, 2017. Other earthquakes in the area in the past 30 years of M>=4.8 included events of M 5.0 in November, 1992 and M 5.6 on April 21, 1991. Forecast 123955 had expected enhanced activity in Madagascar to the northwest was likely in early May.

 

O: 13MAY2020 19:02:29  20.3S   47.7E mb=4.8  EMSC   MADAGASCAR                   

P:  3MAY2020 123955    18.0S   42.0E 3.0-4.6 CCCAA  Madagascar area            

 

An unusual earthquake of M 4.3 also occurred near the coast of South Australia today. NEIC reported this earthquake of M 4.3 in South Australia  was felt with intensity II-III in the area(s) of South Australia at Port Pirie and Gawler.  This is the strongest earthquake within about 300 km of this epicenter since an M 4.7 on April 29, 2014 and prior to that an M 4.6 on October 15, 2011. No damage was reported with today's event. This epicenter is at 144 degrees from the M 7.7 south of Cuba of January 28, 2020 and may have been promoted by energy from that source.

 

O: 14MAY2020 05:53:34  33.7S  138.8E ML=4.3  EMSC   NEAR COAST OF SOUTH AUSTRALIA

 

The strongest earthquake in the world today was an M 5.7 in the eastern South Pacific near Eastern Island. It was not reported felt in this remote area. The last earthquake of equal or larger size within about 300 km of this epicenter occurred September 72, 2019 with M 5.8. An M 6.3 also occurred on December 19, 2018, the first such event in the area since 2013. Forecast 123992 had expected today's event was likely to the east of this epicenter in early to mid-May.

 

O: 14MAY2020 05:55:21  35.8S  102.9W Mw=5.7  EMSC   SOUTHEAST OF EASTER ISLAND   

P:  8MAY2020 123982    36.0S   97.0W 4.0-5.5 CACAA  Chile Rise                 

 

STRONG QUAKE IN SANTA CRUZ ISLANDS

 

EARTHQUAKE SUMMARY FOR MAY 12, 2020

 

The strongest earthquake in the world today was an M 6.6 in the Santa Cruz Islands north of Vanuatu. NEIC reported it was felt with intensity I-II in Port Olry, Sanma, Vanuatu and honiara, Guadalcanal, Solomon Islands. This is the strongest earthquake in the Santa Cruz or northern Vanuatu Islands within about 200 km of this epicenter since a similar M 6.6 about 150 km south of this epicenter on January 15, 2019. The last such event of larger magnitude was an M 6.7 on April 7, 2016. Forecast 123963 had expected today's event within about 100 km of the epicenter was likely in early May.

 

O: 12MAY2020 22:41:14  12.0S  166.6E Mw=6.6  EMSC   SANTA CRUZ ISLANDS           

P:  6MAY2020 123963    13.0S  166.0E 4.0-5.4 CAAAA  Vanuatu Islands            

 

The largest earthquake in the U.S. or Canada today again occurred in the Fox Islands, Aleutians, Alaska. It was not reported felt in this remote epicentral area. Earthquakes in the Fox Islands of M>=3.8 last occurred in late April on April 23 (M 4.1) and April 20, 2020 (M 4.6). Forecast 123919 had expected today's activity in early May.

 

O: 13MAY2020 02:50:33  52.9N  167.7W mb=3.8  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  8MAY2020 123919    51.9N  169.2W 3.5-5.2 BAAAA  Fox Islands, Aleutians     

 

 

 

 

 

 

 

 

 

HAWAII SEES MAJOR SWARM IN SEAMOUNT SOUTH OF HAWAII ISLAND

 

EARTHQUAKE SUMMARY FOR MAY 11, 2020

 

An M 3.8 and 3.9 in Hawaii near the Loi'hi Seamount south of the Island of Hawaii were followed by a strong swarm of light aftershocks of M 2-3. This appears to extend the current activation of seismicity in Hawaii to this active seamount. NEIC reported the earthquakes of M 3.8 in Southern Hawaii  were felt with intensity II-III in the area(s) of Southern Hawaii at Pahoa.  This is the strongest activity in the area south of Hawaii since an M 4.0 on October 8, 2019 and prior to that an M 4.2 on August 22, 2019. The area was not active in the eruption of the summer of 2018. Forecast 123787 had expected activity in Hawaii at enhanced levels was likely in early May. This may be related to the full moon which was complete while Hawaii was at local solar noon on May 7 as noted in previous summaries:

 

"The full moon arrived at 10:45 UT on May 7, 2020. Areas which were at about 20 East longitude and 160 West longitude are most susceptible to tidal triggering" (May 5-9, 2020)

 

O: 12MAY2020 03:31:54  18.9N  155.2W ML=3.0  EMSC   HAWAII REGION, HAWAII

O: 11MAY2020 16:09:35  18.9N  155.2W ML=3.1  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 00:08:18  18.9N  155.2W ML=3.3  EMSC   HAWAII REGION, HAWAII

O: 11MAY2020 21:59:02  18.9N  155.2W ML=3.8  EMSC   HAWAII REGION, HAWAII

O: 11MAY2020 22:52:12  18.9N  155.2W ML=3.9  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 02:03:07  18.9N  155.2W Ml=3.0  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 01:25:42  18.9N  155.2W Ml=3.1  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 06:23:54  18.9N  155.2W Ml=3.2  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 01:44:08  18.9N  155.2W Ml=3.3  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 01:52:11  18.9N  155.2W Ml=3.3  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 04:51:43  18.9N  155.2W Ml=3.3  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 01:46:26  18.9N  155.2W Ml=3.4  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 02:34:04  18.9N  155.2W Ml=3.5  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 02:15:05  18.9N  155.2W Ml=3.7  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 03:58:09  18.9N  155.2W Ml=3.8  EMSC   HAWAII REGION, HAWAII

O: 11MAY2020 23:29:36  19.0N  155.2W ML=3.1  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 04:12:36  19.0N  155.2W ML=3.1  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 03:40:04  19.0N  155.2W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 12MAY2020 02:37:09  19.0N  155.3W ML=3.6  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7MAY2020 123787    19.9N  155.1W 3.0-4.5 BAAAA  Hawaii                      

 

The strongest seismicity in the U.S. or Canada today were a series of light to moderate events in the central and western Andreanof Islands, Aleutians. The largest of these was of M 4.3 far to the west. These events especially the M 3.9 in the central Andreanof Islands were accompanied by an M 4.9 at the antipode in the Bouvet Islands south of Africa. The M 4.3 in the Andreanof Islands is the strongest within about 150 km of today's epicenter since an M 4.9 on April 1, 2020 and an M 5.1 on March 3, 2020 - an aftershock of an M 5.8 on March 2. Forecast 123915 had expected today's activity in early May.

 

O: 12MAY2020 00:43:50  50.5N  177.7W mb=3.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 11MAY2020 10:42:30  51.1N  176.5W mb=3.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6MAY2020 123915    51.0N  177.1W 3.5-5.2 BAAAA  Andreanoff Isls, Aleutians 

 

O: 11MAY2020 22:53:26  51.6N  179.8W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6MAY2020 123915    51.9N  179.8W 3.5-5.0 BAAAA  Andreanoff Isls, Aleutians 

 

O: 12MAY2020 02:18:52  54.1S    3.4E mb=4.6  EMSC   BOUVET ISLAND REGION         

 

STRONG QUAKE IN JAPAN; MODERATE IN SOUTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR MAY 10, 2020

 

The strongest earthquake in the world today was an M 5.8 off the east coast of Honshu, Japan. NEIC reported maximum intensity V in Ibaraki and IV in Chiba Prefecturs with II-III in Fukushima, and Tochigi Prefectures, Japan. This is the largest earthquake within about 150 km of this epicenter since an M 6.3 on August 4, 2019. Prior to that an M 6.9 occurred in this area on November 21, 2016. The epicenter of an M 7.9 on March 11 occurred within about 20 km of today's epicenter, these appear to be aftershocks of the great M 9.3 off Honshu also on March 11, 2011. Forecast 123850 had expected today's event within this area around May 10. This event may be related to the other strong tidal enhancement of seismicity near 140 East longitude as previously noted in this summary as it occurred at 141 East longitude.

 

O: 10MAY2020 23:58:34  36.4N  141.1E Mw=5.8  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 10MAY2020 123850    37.0N  141.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

Moderately strong earthquakes of M 5.6 and 5.5 also occurred as aftershocks  in the Banda Sea, Indonesia and in the Antofagasta region of northern Chile. Both areas have been active in the past two weeks. The event in Banda is the strongest aftershock to date of the M 6.8-7.3 mainshock of May 6, 2020. Forecast 123776 had expected enhanced seismicity in the area was likely around May 8.

 

O: 11MAY2020 02:56:09   5.7S  131.1E ML=4.1  EMSC   BANDA SEA

O: 11MAY2020 01:06:18   6.0S  129.9E Mw=5.6  EMSC   BANDA SEA

O: 11MAY2020 03:29:23   6.1S  130.0E mb=4.4  EMSC   BANDA SEA                    

P:  8MAY2020 123776     7.0S  131.0E 4.0-5.6 BAAAA  West Irian, PNG            

 

GUC reported this earthquake was felt with intensity  V in  Antofagasta at Sierra Gorda; III in Antofagasta and Mejillones, Chle. NEIC reported this earthquake of M 5.5 in Atacama, Chile  was felt with intensity II-III in the area(s) of Atacama, Chile at Calama (VI) and Tocopilla, Iquique, Taltal, Antofagasta, Chile. An M 5.3-5.4 on April 30, 2020 was followed by an M 5.0 on May 8, 2020. These followed the near passage of a relatively large asteroid on April 29. But the last earthquake of larger magnitude than M 5.5 in the Antofagasta area of Chile was an M 5.6 on September 30, 2019 followed by an M 5.8 on October 6, 2019. Forecast 123967 had expected today's event within about 100 km was likely around May 11. This epicenter is at 145 degrees from the M 7.3 in the Banda Sea of May 6 and was probably promoted by energy from that source.

 

O: 10MAY2020 18:04     22.8S   68.2W mb=5.5  GUC    Antofagasta at Sierra Gorda; I

P: 11MAY2020 123967    23.0S   69.0W 4.0-5.9 AAAAA  Coast No. Chile            

 

The largest earthquake in the U.S. or Canada today was an M 4.5 in southern California. NEIC reported it was felt widely in the area with maximum shaking IV in Westmorland, Imperial, Boulevard, Jacumba, California and II-III in Pine Valley, El Centro, Thermal, Ocotillo, Borrego Springs and Julian among others.   NEIC reported an aftershock of M 2.5 in  southern California was felt with intensity II-III in the area(s) of southern California at Palm Desert.  The last earthquake within about 50 km of this epicenter with M>=4.5 occurred on August 26-27, 2012 when a series including an M 5.4 and 5.5 shook the area about 50 km east of this epicenter. An M 4.9 also occurred about 75 km to the northwest of this on April 4, 2020 and prior to that about 100 km to the southeast on November 19, 2018. Forecast 123857 had expected today's activity within about 50 km was likely around May 11. When a foreshock series hit this epicenter to the northeast on May 6 with M 3.8 and 3.9, this summary noted:

 

"The largest earthquake in the U.S. today was an M 3.9 in southern California. NEIC reported it was felt with maximum intensity IV in Calipatria and Westmorland and II-III in Brawley, Imperial, Holtville, Calexico, Santee, and Yucca Valley and with III in Mexicali, Baja California, Mexico. NEIC reported this earthquake of M 2.8 in Southern California  was felt with intensity II-III in the area(s) of Southern California at Westmorland and Imperial. Possibly the largest earthquake in the area in the past 120 years was an M 7.1-7.3 on November 21, 1915. JPL reported a close encounter with an earth-crossing asteroid occurred on the same date. Data from JPL on this event is:

 

ID:4486 Mithra (1987 SB)  DATE: 1915-Nov-21 TIME:22:33  MAGNITUDE:  15.5  MAXIMUM DIAMETER:   4.7 km

 

This was the largest earth-crossing asteroid in JPL data from this time to May 1, 1924 when a rock  with maximum diameter of 8.2 km passed nearby - an event followed by an M 7.3 earthquake in Tonga." (May 7, 2020)   

 

 

O: 10MAY2020 22:16:32  33.0N  116.0W ML=2.1  EMSC   SOUTHERN CALIFORNIA

O: 10MAY2020 22:25:13  33.0N  116.0W ML=2.3  EMSC   SOUTHERN CALIFORNIA

O: 11MAY2020 04:34:33  33.0N  116.0W ML=2.4  EMSC   SOUTHERN CALIFORNIA

O: 11MAY2020 00:44:43  33.0N  116.0W ML=2.8  EMSC   SOUTHERN CALIFORNIA

O: 11MAY2020 00:24:29  33.0N  116.0W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 11MAY2020 04:18:58  33.0N  116.0W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 11MAY2020 01:30:40  33.0N  116.0W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 11MAY2020 04:37:35  33.0N  116.0W Ml=2.4  EMSC   SOUTHERN CALIFORNIA

O: 10MAY2020 22:07:40  33.0N  116.0W Mw=4.5  EMSC   SOUTHERN CALIFORNIA          

P: 11MAY2020 123857    32.6N  116.1W 2.5-4.4 AAAAA  So. California             

 

The M 4.5 earthquake in southern California was followed by an M 3.4 in Hawaii several 13 minutes later that may have been enhanced by S-waves from California which arrived in Hawaii at this time (38 degrees). This event was reported by NEIC to have been felt with intensity II-III in Volcano, Captain Cook, Mountain View and Kailua Kona, Hawaii. This follows an increase in Hawaiian seismicity following the passage of the asteroid on April 29 and the full moon. Forecast 123787 had expected today's activity in Hawaii would be enhanced around May 7.

 

O: 10MAY2020 22:20:39  19.3N  155.4W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7MAY2020 123787    19.9N  155.1W 3.0-4.5 BAAAA  Hawaii                     

 

A light earthquake of M 3.1 occurred in western Texas today south of the active  region of recent years. An M 3.3 occurred north of this on April 4, 2020 and to the southwest on June 18, 2019 with M 3.9. Forecast 123853 expected an event in the area was likely around May 6. When an antipodal earthquake hit the Indian Ocean on May 8 (about at 50 km from the exact antipode of today's epicenter) this summary noted:

 

 

"The earthquake (of M 5.5 on May 8) in the Mid-Indian Ridge is antipodal within about 2 degrees of a series that has been occurring in Western Texas. One of these occurred about two hours after the Indian Ocean earthquake with M 2.8. An M 5.0 earthquake occurred in the Texas zone on March 26, the largest in western Texas since April 14, 1995 when an M 5.7 shook the area." (May 9, 2020)

 

NEIC reported this earthquake of M 3.1 in Western Texas  was felt with intensity II-III in the area(s) of Western Texas at Alpine and Plano.  Both the earthquakes in Western Texas and in southern California are located at 102-104 degrees from the M 6.8 in Eastern Turkey of January 24, 2020 and were probably enhanced by energy from that source.

 

O: 10MAY2020 11:16:21  30.3N  103.4W ML=3.1  EMSC   WESTERN TEXAS                

P:  6MAY2020 123853    31.5N  103.6W 2.0-4.2 BBAAA  SW U.S.A                   

 

MODERATE QUAKES SHAKE LUZON, CENTRAL PHILIPPINES

 

EARTHQUAKE SUMMARY FOR MAY 9, 2020

 

A moderate earthquake of M 5.3 was widely felt in the Luzon, Philippines region today. NEIC reported maximum intensity V in Southern Tagalog at Balaytigui, Balayan, Payapa, and Manveles, Central Luzon; IV in Cabacben and Bitangan and II-III in Calantas, Naic, Indang, and Pangili. The M 5.3 was preceded by an M 4.6 to the northeast earlier in the day. That event was reported with intensity V in Central Luzon at Gutad, and Angeles, IV in Manila and II-III in Los Banos, Obando and Imus, Philippines. The only earthquake in Luzon in the past six months with M>=5.3 was an M 5.6 on November 6, 2019. Forecast 12391 had expected this activity in Luzon within about 100 km was likely in early May.

 

O:  9MAY2020 17:03:52  13.7N  120.6E ML=4.1  EMSC   MINDORO, PHILIPPINES         

O:  9MAY2020 19:18:12  14.0N  120.6E Mw=5.3  EMSC   LUZON, PHILIPPINES           

P:  5MAY2020 123791    14.0N  122.0E 3.5-4.9 BABAA  Luzon, Philippines          

 

O:  9MAY2020 11:19:42  15.0N  122.6E mb=4.6  EMSC   LUZON, PHILIPPINES           

P:  5MAY2020 123791    14.0N  122.0E 3.5-4.9 BAAAA  Luzon, Philippines         

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in the Vancouver Island area of British Columbia, Canada. NEIC reported it was lightly felt with intensity II in British Columbia at Port MacNeill, Port Hardy and White Rock, Canada. The last earthquake within about 150 km of this epicenter with larger or equal magnitude was an M 4.7 on December 9, 2018, an aftershock of an M 5.4 on December 9, 2018. Forecast 123909 had expected today's event in this region was likely in early May. This earthquake is at 103 degrees from the M 7.3 in the Banda Sea of May 6 and was likely promoted by concentrated energy from that source.

 

When a series of foreshocks occurred near today's epicenter on May 5, this summary noted this as:

 

"A series of light earthquakes in the Vancouver Island of Canada also contained an event of M 3.8 and were lightly felt in the Port Alice, British Columbia area today. These are about 100 km southeast of the normal seismicity in this area. The last event listed by NEIC within about 100 km of the M 3.8 with equal or greater magnitude was an M 4.0 on October 29, 2018 and prior to that an M 3.9 on June 19, 2017. Forecast 123909 had expected a moderate earthquake was likely in this area around May 4." (May 6, 2020)

 

 

O: 10MAY2020 04:46:00  49.3N  127.8W MB=4.0  ECAN OF GOLD RIVER, BC              

O: 10MAY2020 04:46:01  49.5N  127.7W mb=4.7  EMSC   VANCOUVER ISLAND, CANADA REGIO

P:  4MAY2020 123909    49.2N  129.1W 2.8-5.0 CAAAA  Vancouver Island area      

 

An M 4.7 in the Unimak Island area of Alaska was also felt with intensity III in False Pass, Alaska today. This is the strongest earthquake in the Unimak area of Alaska in the past six months but recent activity including an M 4.4 on April 26, 2020 has suggested regional activation. Forecast 123930 had expected today's event within about 15 km of the epicenter was likely around May 8.

 

O:  9MAY2020 14:02:03  54.4N  163.6W mb=4.7  EMSC   UNIMAK ISLAND REGION, ALASKA 

P:  8MAY2020 123930    54.5N  163.5W 3.5-5.0 AAAAA  Unimak Islands, Aleutians  

 

An earthquake of M 3.9-4.3 was also widely felt in southern Quebec, Canada today. NEIC reported intensity IV in Quebec at Ferre-Neuve, Mont-Laurier, Shawville, and II-III in Maniwaki, Pembroke, Buckingham, Ottawa, Kanata, Eganville and Chesterville. The last earthquake of M>=4.3 in southern Quebec within about 200 km of this epicenter was an M 4.4 on May 17, 2013. Forecast 123896 had expected today's event in this region was likely in early May.

 

O:  9MAY2020 19:03:55  46.9N   75.9W MB=4.3  ECAN OF MANIWAKI, QC                

O:  9MAY2020 19:04:18  47.0N   75.9W mb=3.9  EMSC   SOUTHERN QUEBEC, CANADA      

P:  4MAY2020 123896    46.0N   75.0W 2.0-4.0 BAAAA  New York State             

 

MODERATE QUAKE SHAKES MID-INDIAN RIDGE; ANTIPODAL TO WESTERN TEXAS

 

EARTHQUAKE SUMMARY FOR MAY 8, 2020

 

The strongest earthquake in the world today was an M 5.5 on the Mid-Indian Ridge. It was not reported felt in this remote epicentral area. The last earthquake of M>=5.5 within about 500 km of this epicenter in the Indian Ocean occurred as an M 5.7 about 500 km northwest of today's epicenter on March 26, 2009. Similar earthquakes hit that epicenter on March 14, 2005, January 1, 2002 and August 28, 1999 but there have been no recorded earthquakes within 400 km of today's epicenter in the past 30 years. Forecast 123987 had expected activity in this region around May 6. Today's earthquake is at 106 degrees from the last major earthquake in the world - the M 7.7 in the Kuril Islands of March 25 and may have been promoted by energy from that source.

 

O:  8MAY2020 20:45:30  29.5S   76.6E Mw=5.5  EMSC   MID-INDIAN RIDGE             

P:  6MAY2020 123987    37.0S   79.0E 4.0-5.5 ACBAA  So. Indian Ocean           

 

The earthquake in the Mid-Indian Ridge is antipodal within about 2 degrees of a series that has been occurring in Western Texas. One of these occurred about two hours after the Indian Ocean earthquake with M 2.8. An M 5.0 earthquake occurred in the Texas zone on March 26, the largest in western Texas since April 14, 1995 when an M 5.7 shook the area. Forecast 123853 had expected today's event within about 100 km was likely around May 9.

 

O:  8MAY2020 22:57:24  31.6N  104.3W mb=2.8  EMSC   WESTERN TEXAS                 

P:  9MAY2020 123853    32.6N  104.6W 2.0-4.3 AAAAA  SW U.S.A                   

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 aftershock of the M 6.5 event in southern Idaho of March 31, 2020. Today's event was accompanied by the usual smaller aftershocks in the area. NEIC reported this earthquake of M 3.6-4.1 in Southern Idaho was felt with intensity II-III in the area(s) of Southern Idaho at Sweet, Boise, and Eagle. Forecast 123891 had expected this event was likely within the aftershocks zone around May 8.

 

O: 08MAY2020 13:04:00  44.2N  115.1W Ml=4.1  EMSC   SOUTHERN IDAHO

O: 08MAY2020 17:47:23  44.2N  115.2W ML=2.6  EMSC   SOUTHERN IDAHO

O: 09MAY2020 04:18:28  44.3N  114.9W ML=2.7  EMSC   SOUTHERN IDAHO

O: 08MAY2020 22:13:40  44.4N  115.2W ML=2.6  EMSC   SOUTHERN IDAHO

O:  8MAY2020 13:24:48  44.2N  115.1W ML=2.8  EMSC   SOUTHERN IDAHO               

P:  8MAY2020 123891    44.5N  115.1W 2.0-4.0 AAAAA  Montana/Idaho              

 

 

STRONG QUAKE IN NEW BRITAIN FOLLOWS SEISMIC PATTERN

 

EARTHQUAKE SUMMARY FOR MAY 7, 2020

 

Strong seismicity continued today near 140 East longitude, the longitude where

tidal stress was maximized in the last full and new moon. The M 7.3 in the Banda

Sea of Indonesia reported on in the last issue of this report (at 130 East longitude) was followed by an M 6.1 strong earthquake in the region of New Britain (at 154 East longitude) today and the third largest earthquake in the world today - an M 5.3 in New Britain. But global seismicity is not expected to be exceptional for the next several days with the full moon. Today's event occurred near local solar midnight and may have been promoted by tidal stresses associated with the full moon as noted in previous issues of this summary:

 

"The full moon arrived at 10:45 UT on May 7, 2020. Areas which were at about 20 East longitude and 160 West longitude are most susceptible to tidal triggering within the next five days. While the general effect of a full moon is to dampen global seismicity areas including the eastern Aleutians, Samoa, in the west and Greece and eastern Europe in the east may see enhanced seismicity at this time." (May 5-7, 2020)

 

The M 6.1 is probably an aftershock of the M 6.3 in this area of April 25, 2020.

Forecast 123773 had expected today's activity was likely around May 6.

 

O:  7MAY2020 11:21:20   4.5S  154.7E Mw=6.1  EMSC   BOUGAINVILLE REGION, P.N.G.  

P:  6MAY2020 123773     6.0S  155.0E 4.0-5.6 ABAAA  Solomon Islands            

 

An earthquake of M 5.6 also was recorded today in the South Sandwich Islands, southeast of South America. It was not reported felt in this remote epicentral area. This is the strongest earthquake in the South Sandwich Islands within about 200 km of this epicenter since an M 5.6 on October 23, 2019. The last such event in the area of larger magnitude was an M 5.8 on May 27, 2019. Forecasts 123739 and 123996 had expected this activity within about 100 km of this epicenter in late April or early May. Today's event occurred within about 30 minutes of local solar midnight and may have been promoted by tidal stresses associated with the full moon of May 7.

 

O:  8MAY2020 01:14:20  55.5S   29.3W Mw=5.6  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  4MAY2020 123996    56.0S   26.0W 4.0-5.7 BABAA  So. Sandwich Islands       

P: 29APR2020 123739    55.0S   28.0W 4.0-5.9 CAAAA  So. Sandwich Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the eastern Andreanof Islands, Aleutians, Alaska. It is the strongest earthquake within about 100 km of this epicenter since an M 4.3 on March 28, 2020. Forecast 123916 had expected activity in this area was likely around May 4.

 

O:  7MAY2020 19:16:31  52.5N  174.2W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  4MAY2020 123916    52.2N  173.9W 3.5-5.1 BAAAA  Andreanoff Isls, Aleutians 

 

The strongest earthquake in the U.S. outside Alaska today was another M 3.8 in

Hawaii.  NEIC reported this earthquake of M 3.8 in Hawaii  was felt with intensity II-III in the area(s) of Naalehu and Kailua Kona, Hawaii.  This follows similar events on each of the past three days and suggests reemergence of seismicity/volcanism after nearly two years of relative regional quiet. Forecast 123787 had expected moderate activity in Hawaii around May 7.

 

O:  7MAY2020 12:00:37  19.2N  155.4W Ml=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

O:  7MAY2020 08:55:01  19.6N  156.2W ML=3.8  EMSC   HAWAII REGION, HAWAII        

P:  7MAY2020 123787    19.9N  155.1W 3.0-4.5 AAAAA  Hawaii                      

 

STRONG EARTHQUAKE SHAKES BANDA SEA, INDONESIA

 

EARTHQUAKE SUMMARY FOR MAY 6, 2020

 

The strongest earthquake in the world today was an M 6.8 in the Banda Sea, Indonesia. NEIC reported it was felt with intensity IV in the region of Timor, Indonesia at Dili and with III-IV in Northern Territory, Australia at Darwin, Ngulu, Coonawarra, Palmerston, Howard Springs, Humpty-Doo-MacMinns Lagoos, Katherine and in Western Australia at Kununurra. BMG gave M 7.3 for this earthquake and indicated it was felt with intensity III-IV in Saumlaki; III in Banda, Dobo, Tual, Sorong, Fak-Fak, Kaiman, Tiakur; II-II in Merauke and II in Manokwari, Kupang and Waingapu, Indonesia. At M 7.3 it is the strongest earthquake in the world since the M 7.5-7.7 in northern Kurils of March 25, 2020 and an M 7.7 in the Cayman Islands of January 28, 2020. Only two other earthquakes of M>=6.8 have occurred in the world during 2020 – an M 6.8 in the Kurils on February 13, 2020 and an M 6.8 in eastern Turkey on January 24, 2020. It may have been promoted by tidal stresses associated with the full moon as  noted in previous issues of this summary:

 

 

"The full moon will arrive at 10:45 UT on May 7, 2020. Areas which are at about 20 East longitude and 160 West longitude are most susceptible to tidal triggering within the next five days. While the general effect of a full moon is to dampen global seismicity areas including the eastern Aleutians, Samoa,  and Tonga in the west and Greece and eastern Europe in the east may see enhanced seismicity at this time." (May 5-6, 2020)

 

The earthquake of M 6.8-7.3 in the Banda Sea is the largest within about  300 km of that epicenter since an M 7.3 on June 24, 2019 and prior to that an M 7.6 on January 27, 2006. Forecast 123776 had expected today's event within about 10 km of the BMG epicenter was likely around May 6. This earthquake is located at 148 degrees from the M 7.7 in the Cayman Islands of January 28 and may have been promoted by energy from that source. It is also at the sixth node (60 degrees) from the last major global event - the Kuril Island earthquake of March 25 of M 7.7 and may have been promoted by that event as well.

 

O: 06MAY2020 13:53:55   6.9S  129.8E Mw=6.8  EMSC   BANDA SEA

O: 06MAY2020 13:53:57   7.0S  130.0E Mw=7.3  BMG    BANDA SEA

O: 07MAY2020 00:39:04   6.9S  130.8E ML=4.3  EMSC   BANDA SEA

O:  6MAY2020 19:19:40   6.9S  127.5E ML=4.3  EMSC   BANDA SEA                    

P:  6MAY2020 123776     7.0S  130.0E 4.0-5.5 AAAAA  West Irian, PNG            

 

The largest earthquake in the U.S. today was an M 3.9 in southern California. NEIC reported it was felt with maximum intensity IV in Calipatria and Westmorland and II-III in Brawley, Imperial, Holtville, Calexico, Santee, and Yucca Valley and with III in Mexicali, Baja California, Mexico. NEIC reported the  earthquake of M 2.8 in Southern California  was felt with intensity II-III in the area(s) of Southern California at Westmorland and Imperial.  Possibly the largest earthquake in the area in the past 120 years was an M 7.1-7.3 on November 21, 1915. JPL reported a close encounter with an earth-crossing asteroid occurred on the same date. Data from JPL on this event is:

 

ID:4486 Mithra (1987 SB)  DATE: 1915-Nov-21 TIME:22:33  MAGNITUDE:  15.5  MAXIMUM DIAMETER:   4.7 km

 

This was the largest earth-crossing asteroid in JPL data from this time to May 1, 1924 when a rock  with maximum diameter of 8.2 km passed nearby - an event followed by an M 7.3 earthquake in Tonga.   

 

Today's event is the strongest within about 100 km of this epicenter since an  M 4.0 on November 12, 2019 and prior to that an M M 3.9 on January 17, 2019. Forecast 123857 had expected today's activity was likely within about 30 km  around May 4.

 

O: 06MAY2020 08:27:04  33.2N  115.6W ML=3.8  EMSC   SOUTHERN CALIFORNIA

O: 06MAY2020 08:27:05  33.2N  115.6W ML=3.9  ANSS   SOUTHERN CALIFORNIA

O: 06MAY2020 07:52:46  33.2N  115.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 06MAY2020 08:36:04  33.2N  115.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 06MAY2020 10:21:15  33.2N  115.6W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 06MAY2020 08:29:03  33.2N  115.6W Ml=2.8  EMSC   SOUTHERN CALIFORNIA

O: 06MAY2020 08:45:52  33.2N  115.7W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O:  6MAY2020 13:32:19  33.2N  115.6W ML=2.0  EMSC   SOUTHERN CALIFORNIA          

P:  4MAY2020 123857    32.9N  115.6W 2.5-4.4 AAAAA  So. California             

 

A pair of moderate earthquakes also occurred in the Puerto Rico Trench north of the Island today with M 4.4 and M 4.7. NEIC reported these earthquakes of M 4.4 and 4.7 in Northern Puerto Rico  were felt with intensity II-III in the area(s) of Northern Puerto Rico at Rincon, Moca, San Sebastian, Mayaguez, Lares, Orocovis, Ponce, Bayamon and Trujillo Alto. This summary has noted in past issues that this area is prone to significant seismicity as in the issue of April 29.

 

 

"The strongest earthquake in the U.S. or Possessions today was an M 3.9 north of Puerto Rico in the Puerto Rico Trench. The last event within about 100 km of this epicenter in Puerto Rico of larger magnitude was an M 4.4 on December 28, 2019 and prior to that an M 4.6 on October 7, 2019. Two events of M 3.9 have occurred in the area in the past month - on April 8 and March 29. The area is overdue for a major earthquake but this is most likely in conjunction with a major solar flare of hurricane and not immediate." (April 29, 2020)

 

A major quake hit the area on August 8, 1946 following a similar event several days earlier. This is the strongest regional event in the last century. Like today's activity and that of April 29, the events of August, 1946 were associated with a relatively large earth-crossing asteroid. That asteroid had maximum diameter about 2 km with the following JPL data:

 

 

ID:69230 Hermes (1937 UB)  DATE:1946-Aug-07 TIME:11:33  MAGNITUDE: 17.5    MAXIMUM DIAMETER:  1.9 km

 

The M 4.7 today is the strongest within about 100 km of this epicenter since an

M  6.0 on September 24, 2019.  Forecast 123805 had expected today's event was  likely around May 6.

 

O:  7MAY2020 02:59:25  19.3N   67.7W mb=4.4  EMSC   PUERTO RICO REGION           

O:  6MAY2020 21:30:43  19.3N   67.8W ML=3.7  EMSC   PUERTO RICO REGION           

O:  6MAY2020 19:00:36  19.3N   67.8W mb=4.7  EMSC   DOMINICAN REPUBLIC REGION    

O:  6MAY2020 20:12:14  19.4N   67.7W ML=3.3  EMSC   PUERTO RICO REGION           

P:  6MAY2020 123805    20.0N   68.0W 3.0-4.5 AAAAA  Bahamas/No. Caribbean      

 

There were two unusual earthquakes in Canada today. An M 4.9 in Canada's Northwest Territories was joined by an M 3.0-3.7 in southern Quebec near the Vermont border. It was widely felt. NEIC reported this earthquake of M 3.1 in Southern Quebec, Canada  was felt with intensity II-III in the area(s) of Southern Quebec, Canada at Highgate Center (IV); Bedford, Cowansville, Farnham, and in Vermont at Franklin, Sheldon, East Berkshire, Enosburg Falls, Swanton and Richford. The last earthquake of M>=3.7 listed within about 100 km of this epicenter was an M 4.5 on October 10, 2012. Forecast 123895 had expected today's activity was likely around May 4.

 

O:  6MAY2020 15:03:41  45.0N   72.9W MB=3.7  ECAN Bedford, QC. Felt              

P:  4MAY2020 123895    44.0N   73.0W 2.0-4.2 AAAAA  New England                

 

The strongest earthquake in the "U.S. or Canada today was a M 4.9 in the Northwest Territories of Canada. It was not reported felt in this remote epicentral area. This is the strongest earthquake within about 300 km of this epicenter in at least 30 years. The only comparable event on record is an M 5.5 which hit about 300 km west of this epicenter on April 13, 1922.

 

O:  6MAY2020 15:55:04  60.8N  105.3W mb=4.9  EMSC   NORTHWEST TERRITORIES, CANADA

 

An unusual, but unfelt, M 2.1 also was recorded in Illinois today. An M 2.5 hit about 50 km north of this on October 27, 2019 and prior to  that as an M 2.5 on December 9, 2018. Forecast 123843 had expected today's event within about 50 km around May 6.

 

O:  6MAY2020 12:23:28  37.9N   88.7W Md=2.1  EMSC   ILLINOIS                     

P:  6MAY2020 123843    38.0N   89.0W 2.0-4.1 AAAAA  New Madrid area             

 

MODERATE QUAKES SHAKES SAMOA

 

EARTHQUAKE SUMMARY FOR MAY 5, 2020

 

The strongest earthquake in the world today was an earthquake of M 5.5 that was felt in the region of Samoa today. NEIC reported it was felt with maximum intensity IV in American Samoa and II in Siuniu Rest of Upolu, Samoa. The last earthquake within about 150 km of this epicenter in Samoa with M>=5.5 was an M 6.0 on March 17, 2020 and prior to that an M 5.8 on November 8, 2019. A strong M 6.8 hit the area on November 4, 2017. This may be aftershocks of that event. Today's earthquake of M 5.5 occurred within about 10 minutes of local solar noon and may have been promoted by high tidal stresses which maximize near this hour.  

The full moon arrives at 10:45 UT on May 7 when this area is near local solar midnight and may also have contributed tidal stress to the area at this time as noted in this summary:

 

"The full moon will arrive at 10:45 UT on May 7, 2020. Areas which are at about 20 East longitude and 160 West longitude are most susceptible to tidal triggering within the next five days. While the general effect of a full moon is to dampen global seismicity areas including the eastern Aleutians, Samoa,  and Tonga in the west and Greece and eastern Europe in the east may see enhanced seismicity at this time." (May 5-6, 2020)

 

Forecast 123961 had expected today's event was likely in this area around May 7.

 

O:  5MAY2020 23:20:39  15.2S  172.8W mb=5.5  EMSC   SAMOA ISLANDS REGION         

P:  7MAY2020 123961    16.0S  174.0W 4.0-5.8 AAAAA  Tonga Islands              

 

Moderate seismicity also continued in the region of Tokyo, Japan today. An M 5.0 followed the M 5.6 in that region yesterday and was widely felt.  NEIC reported this earthquake of M 5.0 in Southeastern Honshu, Japan  was felt with intensity IV in the area(s) of Southeastern Honshu, Japan in Chiba and Tokyo.  In the previous summary this report had noted in this regard:

 

"This summary has been noting the enhanced seismicity of the past week near 140 East longitude which may be related to the timing of the new and full moons previously. The earthquake of M 5.6 near Tokyo today is the strongest within about 150 km of that epicenter since an M 5.6 on January 2, 2020 and prior to that an M  5.9 on July 7, 2018 and December 28, 2016.  Forecast 123850 had expected today's event was likely around May 2." (May 5, 2020)

 

O:  6MAY2020 01:16:10  37.4N  141.8E mb=4.7  EMSC   NEAR EAST COAST OF HONSHU, JAP

O:  5MAY2020 16:57:07  35.5N  140.2E Mw=5.0  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  2MAY2020 123850    37.0N  142.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

The strongest earthquake in the U.S. or Canada today was an M 3.8-3.9 in southern Hawaii. NEIC reported it was felt with intensity II-III in Hawaii at Naalehu, Captain Cook, Kailua Kona and Keaau. This follows a similar event yesterday in Hawaii as noted in the last issue of this summary as:

 

"A series of light earthquake shook the island of Hawaii today with M 3.0-4.0. NEIC reported they were felt lightly in Hawaii at Naalehu, Captain Cook, Papaikou, Honomu, Kailua Kona, Hawi and Honolulu among others. The series may indicate another potential eruption in the area such as occurred in the summer of 2018. The earthquake of M 3.8 today is the strongest in the Kilauea volcanic zone since an M 3.8 on March 19 and 21, 2020. The only other such activity in the area in the past five months occurred as an M 4.2 on February 3, 2020. A moderate event to the north of this with M 4.9 occurred November 11, 2019. Forecast 123787 had expected enhanced seismicity in Hawaii was likely around

May 7. At the time of the March activity this summary noted:

 

"This follows a similar M 3.9 in Hawaii on March 19, 2020 and suggests reinvigoration of the volcanic activity in the area." (March 22, 2020)

 

O:  6MAY2020 01:22:57  18.9N  155.8W ML=3.8  EMSC   HAWAII REGION, HAWAII        

P:  7MAY2020 123787    19.9N  155.1W 3.0-4.5 AAAAA  Hawaii                     

 

A series of light earthquakes in the Vancouver Island of Canada also contained an event of M 3.8 and were lightly felt in the Port Alice, British Columbia area today. These are about 100 km southeast of the normal seismicity in this area. The last event listed by NEIC within about 100 km of the M 3.8 with equal or greater magnitude was an M 4.0 on October 29, 2018 and prior to that an M 3.9 on June 19, 2017. Forecast 123909 had expected a moderate earthquake was likely in this area around May 4.

 

O: 05MAY2020 07:48:03  49.2N  127.9W ML=2.8  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 05MAY2020 07:57:15  49.2N  127.9W ML=3.2  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 05MAY2020 05:46:09  49.2N  127.9W MB=3.3  ECAN Port Alice, BC   

O: 05MAY2020 07:57:15  49.2N  127.9W MB=3.2  ECAN Port Alice, BC   

O: 05MAY2020 04:37:47  49.2N  127.9W MB=3.1  ECAN Port Alice, BC   

O:  5MAY2020 22:34:48  49.2N  127.9W MB=3.8  ECAN Port Alice, BC                 

O:  5MAY2020 22:34:48  49.2N  127.9W ML=3.8  EMSC   VANCOUVER ISLAND, CANADA REGIO

P:  4MAY2020 123909    49.2N  129.1W 2.8-5.0 AAAAA  Vancouver Island area      

 

The effects on seismicity  from the relatively large asteroid which made a close encounter with earth on April 29 are largely over. Study of previous such  events suggest that major earthquakes, if they occur with the closest approach of such objects, rarely trigger significant seismicity more than 6 days from  the encounter. Thus, a large earthquake is still possible in the next day, but unlikely following that due to the effects of the close passage. Other stresses such as tidal stresses associated with moon and sun then take over in helping promote seismicity. In researching the relation between close asteroid encounter with earth and large earth movements an event that occurred 100 years ago stood out. This was an  M 8.5-8.8 in Southern China on December 16, 1920. Some researchers suggest that this is the strongest non-subduction earthquake in the world in more than 100 years, possibly the largest ever recorded. The history section of this summary described this events as:

 

The greatest known landslide in history was caused by this earthquake in Kan Sou, China. Whole mountains moved as evidenced by a section of road nearly a mile in length which was move a mile from its former location without disturbing the trees alongside the road. Many inhabitants of the area lived in caves in the mountain and were killed in the landslides. The slide was in loess which when watered and shaken can act as a fluid. Felt with damage over an area of about 600,000 sq. miles and destructive over about 15,000 sq. miles. The earthquake was felt over about 1,500,000 sq. miles. Loss of life was estimated at about 100,000 chiefly from the landslides. A strong sandstorm began in Mongolia after the earthquake from dust thrown up from the earthquake and landslides. The windstorm caused several additional deaths. A second shock occurred in the same area on May 23, 1927 but was not as damaging since the movable loess had already been transported.

 

A relatively large asteroid with largest diameter of about 2 km made its closest approach to earth within about 3 hours of this earthquake. This event is identified by JPL as:

 

ID:7822 (1991 CS)  DATE:1920-Dec-16 TIME:13:38 MAGNITUDE:17.4    DIAMETER:880 m -  2.0 km

 

MODERATE QUAKE SHAKES TOKYO, JAPAN

 

EARTHQUAKE SUMMARY FOR MAY 4, 2020

 

The strongest earthquake of the day occurred at 140 East longitude east of Tokyo, Japan with M 5.6. NEIC reported it was felt with intensity IV in Chiba, Tokyo, Ibaraki and Fukushima, Japan with lesser shaking in Tochigi, Saitama and Gunma Prefectures. NEIC reported an earthquake of M 4.7 in eastern Honshu, Japan  was felt with intensity II-III in the area(s) of eastern Honshu, Japan in Ibaraki, Oyama and Koriyana. This summary has been noting the enhanced seismicity of the past week near 140 East longitude which may be related to the timing of the new and full moons previously. The earthquake of M 5.6 near Tokyo today is the strongest within about 150 km of that epicenter since an M 5.6 on January 2, 2020 and prior to that an M  5.9 on July 7, 2018 and December 28, 2016.  Forecast 123850 had expected today's event was likely around May 2.

 

O:  4MAY2020 13:07:49  35.6N  140.7E Mw=5.6  EMSC   NEAR EAST COAST OF HONSHU, JAP

O:  4MAY2020 13:34:33  36.4N  141.2E mb=4.7  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  2MAY2020 123850    37.0N  142.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

A series of light earthquakes shook the island of Hawaii today with M 3.0-4.0. NEIC reported they were felt lightly in Hawaii at Naalehu, Captain Cook, Papaikou, Honomu, Kailua Kona, Hawi and Honolulu among others.  The series may indicate another potential eruption in the area such as occurred in the summer of 2018. The earthquake of M 3.8 today is the strongest in the Kilauea volcanic zone since an M 3.8 on March 19 and 21, 2020.  The only other such activity in the area in the past five months occurred as an M 4.2 on February 3, 2020. A moderate event to the north of this with M 4.9 occurred November 11, 2019. Forecast 123787 had expected enhanced seismicity in Hawaii was likely around May 7. At the time of the March activity this summary noted:

 

"This follows a similar M 3.9 in Hawaii on March 19, 2020 and suggests reinvigoration of the volcanic activity in the area." (March 22, 2020)

 

 

O:  4MAY2020 11:50:17  19.2N  155.4W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII     

O:  4MAY2020 11:46:15  19.2N  155.4W Md=3.2  EMSC   ISLAND OF HAWAII, HAWAII     

O:  5MAY2020 00:46:32  19.3N  155.1W Md=2.9  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7MAY2020 123787    19.9N  155.1W 3.0-4.5 AAAAA  Hawaii                     

 

IMPACT OF EARTH-CROSSING ASTEROIDS MAY BE GREATER THAN THOUGHT

 

The asteroid which passed by earth on made its closest approach at 09:56 UT April 29, 2020. It is the first asteroid of this size to approach earth since 2017. This summary previously speculated that a sudden increase in seismicity including an M 6.6 in Japan may have been related to tidal stresses related to this close encounter. Further study seemed in order. Earthquakes which coincided within about 5 minutes of this passage included an M 3.4 in Haiti; an M 2.4 in northern California, an M 2.0 aftershock in Ridgecrest, California, an M 3.5 in Chiapas, Mexico; an M 3.1 in Central Utah and an M 2.9 in Puerto Rico. The last object near this size to pass by earth within the same distance was an asteroid of 2.8 km (66391 Mosthup) on May 23, 2019 at 23:05 UT. It was followed by an M 8.0 great earthquake in Peru several hours later. Previous to that the largest earth approaching object passed by on December 22, 2018 at 01:04 UT. About 7 hours earlier an M 7.4 earthquake shook the Komandorsky Islands or Russia. The last asteroid to pass near the earth with larger diameter than that of April 29 was up to 5.4 km wide on December 12, 2012 at 06:40 UT (4179 Toulatis). It was

preceded about half a day earlier by an M 7.3 in the Banda Sea. Other recent asteroid passes coincided with the M 6.6 in Italy on October 30, 2016; an M 7.0 in Fiji on February 24, 2017 about 7 hours after closest passage; an M 6.5 in Sumatra on April 19, 2017 about 7 hours after a close flyby of 3122 Florence. 

A large 3.0 km asteroid also passed the earth with closest encounter at October 8, 2009 at 15:47 UT. Hours before earthquakes of M 7.8 and 7.7 hit the Vanuatu and Santa Cruz Islands. While this is not a statistically valid sample most of the recent close encounters with large earth-crossing asteroids have been closely related to major earthquakes. It is especially interesting that at least three great earthquakes (which are quiet rare) have coincided within hours of these asteroid closest approaches to earth. This may indicate some relation between these two sets of phenomena. Asteroid data From:

 

 https://cneos.jpl.nasa.gov/ca/

 

 

STRONG QUAKE SHAKES NORTHERN  RYUKYU ISLANDS, JAPAN

 

EARTHQUAKE SUMMARY FOR MAY 3, 2020

 

The strongest earthquake in the world today was an M 5.9 near Kyushu, Japan in the Ryukyu Islands. NEIC reported it was felt in Kanagawa with intensity IV and II-III in South Korea, Shanghai, China, and in Japan in other areas of Kanagawa Prefecture. This event suggests that the strong triggering in the region near 140 East longitude and in Japan is not yet over. This area was subject to strong tidal stresses with the last full and new moon and may still be seeing the effects of those tidal alignments. The last earthquake of equal or greater magnitude than M 5.9 within about 200 km of today's epicenter occurred as an M 6.1 on July 13, 2019 and prior to that as an M 7.0 on April 15, 2016 following several foreshocks of M 6.0-6.3 on April 24, 2016. Forecast 123574 had expected today's activity was likely about 100 km to the south of this in late April or early May. This epicenter is at the fifth node (72 degrees) from the activity in eastern Turkey (M 6.8) of January 24 and may have been promoted from energy from that source.

 

O:  3MAY2020 12:01:13  31.1N  129.0E mb=5.0  EMSC   NORTHWEST OF RYUKYU ISLANDS  

O:  3MAY2020 11:54:25  31.4N  128.8E Mw=5.9  EMSC   NORTHWEST OF RYUKYU ISLANDS  

P: 29APR2020 123574    30.0N  129.0E 3.5-4.9 BBAAA  Kyushu, Japan area         

 

An M 5.2 also occurred in eastern Honshu, Japan today in the Izu Islands south of Tokyo. This was the second largest earthquake in the world today. The last earthquake of M>=5.2 in the Izu Islands was an M 5.9 near today's epicenter was followed by regional aftershocks of M 5.2 on December 10 and December 20, 2019. Forecast 123849 had expected today's event in this region was likely around May 7.

 

NEIC reported this earthquake of M 5.2 in Southeastern Honshu, Japan was felt with intensity II-III in the area(s) of Southeastern Honshu, Japan at Yokosuka, Kanagawa.

 

O:  4MAY2020 03:03:10  31.0N  141.9E Mw=5.2  EMSC   IZU ISLANDS, JAPAN REGION    

P:  7MAY2020 123849    30.0N  141.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

An unusual earthquake of M 4.9 was also felt widely in the region of Kenya, East Africa today. NEIC reported this earthquake of M 4.9 in Kenya  was felt with intensity IV-V in the area(s) of Kenya at  Lodwar Rift Valley, Kapenguria, Kakamega, Isioio and Nairobi. This is the strongest earthquake within about 200 km of this epicenter in Kenya since an M 5.2 on January 22, 2012, the only such event in this region in the past 30 years. Earthquakes of M 4.8 and 5.1 hit about 200 km to the north of this on October 23, 2010 and December 3, 2011. Forecast 123194 had expected activity in this general area in late April.

Today's epicenter is at 103 degrees from the M 6.9 in the Kuril Islands of February 11, 2020 and at 107 degrees (similar to Puerto Rico) from the M 7.6 in the Kuril Islands of March 25, 2020 and may have been promoted by energy from those sources. Earthquakes south of Panama and in the South Pacific north of Easter Islands of M 5.1 today was also at 103 degrees from the northern Kuril Islands.

 

O:  3MAY2020 19:36:55   2.8N   36.1E mb=4.9  EMSC   LAKE RUDOLF REGION, KENYA    

P: 27APR2020 123194     6.0S   36.0E 4.0-5.8 CCAAA  Indian Ocean               

 

 

O:  3MAY2020 13:35:27  22.4S  113.6W mb=5.1  EMSC   EASTER ISLAND REGION         

P: 29APR2020 123714    24.0S  115.0W 4.0-5.6 BBBAA  So. East Pacific Rise      

 

 

The most widely felt earthquake in the U.S. or Canada today occurred in the

valleys west of Los Angeles. The strongest of these was an M 2.9-3.1 and was followed later in the day near local solar noon by an M 2.7-2.9. This is the strongest activity in this area within about 50 km since an M 3.7 on April 22, 2020 and prior to that an M 3.5 on February 21, 2020. The only other such event this year was an M 3.6 on January 22, 2020. Forecasts 123594 and 123596 expected this activity late in April.

 

NEIC reported this earthquake of M 2.9 in Greater Los Angeles, California  was felt with intensity II-III in the area(s) of Greater Los Angeles, California at Canoga Park, Chatsworth, Northridge, Porter Ranch, Winnetka, West Hills, Simi Valley, Northridge and Reseda among others. An earlier M 3.1 at the same epicenter was reported with intensity IV in Canoga Park and II-III in Chatsworth, Canoga Park, Northridge, Porter Ranch, Winnetka, West Hills and Simi Valley.  This epicenter is at the sixth node (60 degrees) from the activity in the Kurils of M 7.7 on March 25, 2020 and may have been promoted from energy from that source.

 

O:  3MAY2020 21:45:39  34.3N  118.6W ML=2.7  EMSC   GREATER LOS ANGELES AREA, CALI

O:  3MAY2020 21:45:39  34.3N  118.6W ML=2.9  EMSC   GREATER LOS ANGELES AREA, CALI

O:  3MAY2020 10:19:24  34.3N  118.6W ML=2.9  EMSC   GREATER LOS ANGELES AREA, CALI

O:  3MAY2020 10:19:24  34.3N  118.6W ML=3.1  ANSS   GREATER LOS ANGELES AREA, CALI

P: 26APR2020 123594    34.0N  118.1W 2.5-4.5 CAAAA  So. California             

P: 28APR2020 123596    35.0N  119.2W 2.5-4.5 BAAAA  So. California             

 

A moderate earthquake of M 4.2-4.4 in Puerto Rico was widely felt today in Puerto Rico. NEIC reported this earthquake of M 4.0 in northern Puerto Rico  was felt with intensity II-III in the area(s) of northern Puerto Rico at Rincon, Isabela, San Sebastian, Lajas, Jayuya, Vega Baja and San Juan.  It is not a classical aftershock of the M 5.5 which hit southern Puerto Rico yesterday as it occurred about 150 km to the northwest of that event in the Puerto Rico trench, another area which is prone to large earthquakes. This may be an aftershock of the M 4.4 which hit southwest of this on May 2,  the strongest in that region since early February, 2020. Forecast 123799 had expected today's activity was likely around May 5.

 

O: 03MAY2020 10:44:15  19.0N   67.6W mb=4.2  EMSC   PUERTO RICO REGION

O: 02MAY2020 14:36:17  18.9N   68.7W mb=4.4  ANSS   PUERTO RICO REGION

O: 03MAY2020 17:46:05  19.2N   67.2W Md=3.4  EMSC   PUERTO RICO REGION

O:  4MAY2020 05:35:07  18.9N   67.7W Md=3.3  EMSC   PUERTO RICO REGION           

P:  5MAY2020 123799    18.0N   67.0W 3.4-5.1 AAAAA  Puerto Rico                

 

WORLD AWASH IN MODERATE TO LARGE EARTHQUAKES

 

EARTHQUAKE SUMMARY FOR MAY 2, 2020

 

A series of large to moderate earthquakes washed over the globe today following

a week of quiet seismicity. The largest of today's events was an M 6.6 in Crete, Greece, but the most damaging was an M 5.4-5.5 aftershock in southern Puerto Rico. Moderately large shocks also shook southern Peru (M 5.7-5.9); Taiwan (M 5.1-5.5). It is not immediately obvious what triggered this onslaught of enhanced seismicity. Two class B- solar flares occurred in the past two days including a B2.6 on May 1, the first at this class or above since a B4.5 on April 7 and a B4.2 on April 4, 2020 - the only such solar flares reported by SWPC this year. Still these seem too small to initiate the level of seismicity observed today. The passage of a large asteroid (#52768) near the earth on April 29 also would have added tidal stresses (small) and may  further fuel speculation on the origins of today's sudden seismic outbreak.

 

The M 5.4-5.5 in Puerto Rico is the strongest aftershock since early January, 2020 of the M 5.8 and 6.5 that hit the Ponce, Puerto Rico area on January 6 and 7, 2020. It also follows a series of moderate, but unusual regional shocks in the Dominican Republic and near Cuba in the past week. A number of buildings in Ponce and surrounding areas of southern Puerto were damaged or collapsed. Many had suffered damage in earlier regional earthquakes this year. Electricity was out throughout much of the region. No dams were reported damaged and a tsunami was not reported. No fatalities were reported. Residents were warned to wear face coverings when cleaning up debris.

 

Some of the foreshock activity had raised concerns of a possible upcoming significant aftershock in the Puerto Rico area. This summary had most recently noted the possibility of a strong quake in  the region of Puerto Rico at this time in the summary of April 29 as:

 

"The strongest earthquake in the U.S. or Possessions today was an M 3.9 north of Puerto Rico in the Puerto Rico Trench. The last event within about 100 km of this epicenter in Puerto Rico of larger magnitude was an M 4.4 on December

28, 2019 and prior to that an M 4.6 on October 7, 2019. Two events of M 3.9 have occurred in the area in the past month - on April 8 and March 29. The area is overdue for a major earthquake but this is most likely in conjunction with a major solar flare of hurricane and not immediate." (April 29, 2020)

 

NEIC reported the mainshock was felt throughout most of Puerto Rico. Strong and

damaging intensity VI-VII was reported from Ponce, Guanica, Penuelas, Mercedita, Yauco, and Coto Laurel, Puerto Rico, among others. A number of aftershocks were also widely felt in southern Puerto Rico including the largest of M 4.6 about six minutes after the mainshock. An aftershock of M 4.4 was felt in the Dominican Republic. NEIC reported it was felt with intensity II in Las Terrenas, Samaria, Dominican Republic.

 

Forecasts 123789 and 123532 had expected today's activity was likely at the end of April into early May. This activity is at 103 degrees from the M 7.6 in the Kuril Islands of March 25, the last major global earthquake. At the time this summary suggested that strong enhancement of seismicity in Puerto Rico might result as:

 

 

"Moderate far-field triggering is likely following the earthquake in the Kuril Islands. ... Areas at about 103 degrees from the Kurils include Puerto Rico where a moderate aftershock may be expected" (March 25, 2020)

 

O: 02MAY2020 11:36:09  17.8N   66.7W Ml=3.7  EMSC   PUERTO RICO REGION

O: 02MAY2020 22:16:57  17.9N   66.7W ML=3.0  EMSC   PUERTO RICO REGION

O: 02MAY2020 22:01:37  17.9N   66.7W Md=3.3  EMSC   PUERTO RICO REGION

O: 02MAY2020 11:23:22  17.9N   66.7W Md=3.4  EMSC   PUERTO RICO REGION

O: 02MAY2020 11:27:18  17.9N   66.7W Md=3.4  EMSC   PUERTO RICO REGION

O: 02MAY2020 15:27:21  17.9N   66.7W Md=3.6  EMSC   PUERTO RICO REGION

O: 02MAY2020 11:17:16  17.9N   66.7W Ml=3.5  EMSC   PUERTO RICO REGION

O: 02MAY2020 11:13:19  17.9N   66.7W Mw=5.4  EMSC   PUERTO RICO REGION

O: 02MAY2020 11:32:19  17.9N   66.7W mb=4.6  EMSC   PUERTO RICO REGION

O: 02MAY2020 11:47:52  17.9N   66.8W ML=3.3  EMSC   PUERTO RICO REGION

O: 02MAY2020 11:19:29  17.9N   66.8W mb=4.9  EMSC   PUERTO RICO REGION

O: 02MAY2020 11:25:27  18.0N   66.7W ML=3.4  EMSC   PUERTO RICO REGION

O: 02MAY2020 12:50:22  18.0N   66.7W Md=3.2  EMSC   PUERTO RICO REGION

O: 02MAY2020 21:08:00  18.0N   66.7W Md=3.2  EMSC   PUERTO RICO REGION

O: 02MAY2020 12:51:33  18.0N   66.7W Md=3.3  EMSC   PUERTO RICO REGION

O: 02MAY2020 12:12:06  18.0N   66.7W Md=3.5  EMSC   PUERTO RICO REGION

O:  2MAY2020 14:28:09  18.0N   66.7W Md=3.5  EMSC   PUERTO RICO REGION           

P:  1MAY2020 123789    18.0N   67.0W 3.0-4.9 AAAAA  Leeward Islands            

P: 24APR2020 123532    18.0N   67.0W 3.4-5.1 CAAAA  Puerto Rico                

 

The strongest earthquake in the world today was an M 6.6 in the region of Crete north of the village of Nea Anatoli and the town of Ierapetra. People in

Irakion, Crete went to their balconies to survey for damage. It was followed by a series of aftershocks. No major damage or casualties were reported with this earthquake. NEIC reported the mainshock was felt with maximum intensity V in Greece at Ierapetra; IV in Skhisma, Iraklion, and Tanta, Egypt and II-III in Greece at Koutsouras, and in Egupt at Alexandria, Damanhoor, Fakoos and El Khanka. At least two moderately strong aftershocks of M 5.3 and 5.4 were felt in a similar area.

 

Today's earthquake in Crete is the strongest within about 200 km of that epicenter in at least 30 years. The area has been active in recent months with an M 5.8 to the east on January 30, 2020 and an M 6.0 on November 27, 2019. These events were more than 200 km from today's epicenter.

 

Forecasts 123819 and 123551 had expected today's activity within about 100 km  was likely in late April or early May. The activity in Crete is at 102 degrees  from the M 7.1 in Central California of July, 2019 and may have been promoted by energy from that source as noted at the time.

 

Areas "at or near 103 degrees from Southern California include southern New Zealand, Greece and Turkey... These areas could see enhanced seismicity in coming days" (July 7, 2019)

 

 

O: 02MAY2020 13:45:20  33.9N   25.5E mb=4.7  EMSC   EASTERN MEDITERRANEAN SEA

O: 02MAY2020 14:21:26  33.9N   25.5E mb=4.7  EMSC   EASTERN MEDITERRANEAN SEA

O: 02MAY2020 15:47:36  34.0N   25.0E mb=4.1  EMSC   CRETE, GREECE

O: 02MAY2020 16:44:26  34.0N   25.6E Mw=5.3  EMSC   CRETE, GREECE

O: 02MAY2020 16:13:00  34.0N   25.6E mb=4.6  EMSC   EASTERN MEDITERRANEAN SEA

O: 03MAY2020 05:54:41  34.0N   25.9E mb=4.9  EMSC   CRETE, GREECE

O: 02MAY2020 13:33:50  34.1N   25.6E Mw=5.4  EMSC   CRETE, GREECE

O: 02MAY2020 12:51:05  34.1N   25.7E Mw=6.6  EMSC   CRETE, GREECE

O: 03MAY2020 06:38:34  34.1N   26.1E mb=4.2  EMSC   CRETE, GREECE

O: 02MAY2020 20:32:40  34.2N   25.9E mb=4.0  EMSC   CRETE, GREECE

O:  2MAY2020 14:56:16  34.4N   26.0E mb=4.1  EMSC   CRETE, GREECE                

O:  3MAY2020 02:08:56  35.8N   25.6E mb=4.2  EMSC   CRETE, GREECE                

P:  2MAY2020 123819    35.0N   25.0E 3.0-4.8 AAAAA  Aegean Sea                 

P: 30APR2020 123551    35.0N   25.0E 3.0-4.8 BAAAA  Aegean Sea                 

 

 

A moderate earthquake of M 5.6-5.9 also shook the region of Taiwan today. NEIC reported maximum intensity IV in Pingtung, and Kaohsiung Counties with II-III in Chiayi, Taichung, Changhua, Tainan and Hsinchu. CWB reported this earthquake was felt with intensity IV in Taitung, Hualien, Chiayi, Nantou, Tainan, Changhua, Yunlin; III inKaohsiung, Pingtung, Chiayi, Taichung, Yilan, Miaoli, Hsinchu, II in Penghu and I in Taoyuan, Hsinchu and Taipei, Taiwan. The last earthquake in Taiwan within about 200 km of this epicenter with M>=5.7 was an M 5.7 on February 15, 2020. The last of larger magnitude was an M 6.1 on April 18, 2019.

Forecasts 123817 and 123548 had expected today's activity within about 100 of the epicenter was likely in late April or early May.

 

O:  3MAY2020 03:24:40  23.2N  121.7E mb=5.6  EMSC   TAIWAN                       

O:  3MAY2020 03:24:40  23.2N  121.7E mb=5.7  ANSS   TAIWAN                       

O:  3MAY2020 03:24:40  23.2N  121.6E ML=5.9  TAI    Hualien, Taiwan              

P: 28APR2020 123548    24.0N  122.0E 4.0-5.5 AAAAA  Taiwan                     

P:  3MAY2020 123817    24.0N  122.0E 4.0-5.5 AAAAA  Taiwan                     

 

A moderate earthquake of M 5.4-5.7 shook regions of southern Peru today. NEIC reported intensity IV in Peru at Lampa, Juliacam and Yunguyo and II-III in Ayaviti, Puno, Sicuani, Arequipa, Copacabana, Mollendo and Cusco. GUC reported this earthquake was felt with intensity  IV in   Parinacota and Arica at Arica, Pocon Chile, Putre, San Miguel de Azapa and III in Alcerreca, Codpa, Cuya and in Tarapaca with III in Alto Hospicio, Camina, Iquique, Mamina, Pisagua, Pozo Almonte and II in La Tirana, Chile. This is the strongest earthquake within about 200 km of this epicenter since an M 7.0 on March 1, 2019 to the north of this epicenter. Forecasts 123958, 123695 had expected activity in this area was likely in late April or early May. This event follows similar activity to the south in northern Chile and Argentina April 30 and May 1 and may be related to stress redistribution from those events of M 5.4.

 

O:  3MAY2020 00:44:24  15.4S   70.3W mb=5.4  EMSC   SOUTHERN PERU                

O:  3MAY2020 00:44:27  15.3S   70.5W mb=5.7  ANSS   SOUTHERN PERU                

O:  3MAY2020 00:44     15.8S   70.9W mb=5.6  GUC     Parinacota and Arica at Arica

P: 29APR2020 123695    15.0S   73.0W 4.0-5.4 BABAA  Central Peru                

P: 30APR2020 123695    14.0S   71.0W 4.0-5.6 BBAAA  Central Peru               

P:  4MAY2020 123958    16.0S   70.0W 4.0-5.7 AAAAA  So. Peru/Bolivia           

 

The strongest earthquake in the U.S. or Canada (outside Puerto Rico) was an M 4.5 in the Alaska Peninsula. NEIC reported it was felt with intensity II in King Cove, Alaska. This is the strongest earthquake in the Unimak Island area of Alaska within about 200 km of this epicenter since a similar M 4.5 on March 1, 2020. The last such event with larger magnitude was and M 6.0 on December 31, 2018. An M 5.1 also occurred about 250 km southwest of this on February 15, 2019.  Forecast 123930 had expected this activity was likely around May 4.

 

O:  2MAY2020 07:40:25  55.7N  161.8W mb=4.5  EMSC   ALASKA PENINSULA             

P:  4MAY2020 123930    54.0N  164.9W 3.5-5.1 ABBAA  Unimak Islands, Aleutians  

 

ENHANCED SEISMICITY IN EASTERN EUROPE MAY POINT TO LARGER EARTHQUAKE

 

EARTHQUAKE SUMMARY FOR MAY 1, 2020

 

An unusual earthquake of M 4.5 was felt widely in Bulgaria today. NEIC reported maximum shaking with intensity V in Bulgaria at Pestera and IV in Sadovo and Plovdiv, and II-III in Brezovo, Karlovo, Streicha, Sofia, Haskovo, Samokov and as far as Xanthi, Greece. This appears to be part of an increase in seismicity throughout eastern Europe over the past several days and may indicate a stronger regional event is imminent. Among the events in this series was an unusual M 4.9 in eastern Romania April 24, several events in  Crete with M 4.3 on April 26 and May 1;  and several in Turkey in the past two days including an M 4.9 and an M 4.1. Unusual earthquakes also occurred in a swarm in Northern Italy and as an M 2.5 in the Netherlands today. The only earthquake in Bulgaria of M>=4.5 in the past six months was a similar M 4.5 on December 30, 2019. At that time this summary noted in this regard:

 

"An unusual earthquake of M 4.5 also rocked regions of Bulgaria today.  This epicenter is east of the recent activity in Albania but may be part of the same regional activation. While Bulgaria does experience light to moderate earthquakes frequently this is the strongest event in Bulgaria within about 150 km of this epicenter in more than two years since an M 4.6 on November 26, 2017. A moderately strong earthquake hit the region with M 5.5-5.6 on May 22, 2012." (December 31, 2019)

 

Forecast 123644 had expected regional activity at the end of April.

 

O:  1MAY2020 11:01:39  42.2N   24.9E ML=4.5  EMSC   BULGARIA                     

P: 25APR2020 123644    40.0N   22.0E 3.0-5.1 CCBAA  Romania/NW Turkey          

 

O:  1MAY2020 18:03:12  34.9N   24.6E mb=4.3  EMSC   CRETE, GREECE                

P: 30APR2020 123551    35.0N   25.0E 3.0-4.8 AAAAA  Aegean Sea                 

 

O:  2MAY2020 03:13:15  53.4N    6.8E ML=2.5  EMSC   THE NETHERLANDS              

P: 26APR2020 123666    52.0N    7.0E 3.0-4.5 CBAAA  Netherlands/Belgium        

 

O:  2MAY2020 04:50:36  44.7N   10.3E ML=2.7  EMSC   NORTHERN ITALY               

P: 30APR2020 123613    45.0N   11.0E 3.0-5.2 AAAAA  Austria                    

 

 

The strongest earthquake in the world today was an M 5.4 in the region off the east coast of Kamchatka, Russia. It was not reported felt in this remote epicentral region. The last earthquake in Kamchatka within about 150 km of this epicenter with M>=5.4 was an M 5.6 on January 22, the only such event in the past six months. An M 5.9 about 150 km south of today's epicenter also occurred February 20, 2020. Forecast 123662 had expected today's activity within about 50-100 km of this epicenter was likely at the end of April.

 

O:  1MAY2020 19:53:15  54.4N  160.0E mb=4.1  EMSC   NEAR EAST COAST OF KAMCHATKA 

O:  1MAY2020 07:04:50  54.5N  161.5E mb=5.4  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 27APR2020 123662    55.0N  160.0E 4.0-5.8 BAAAA  E. of Kamchatka            

 

The strongest earthquake in the U.S. or possessions today was and M 3.5 -3.6 in the  aftershocks zone in southern Puerto Rico. This area has been unusually active in the past several days and could still see a significant aftershock.

NEIC reported this earthquake of M 3.6 in Puerto Rico  was felt with intensity II-III in the area(s) of Puerto Rico at Ponce and Punuelas (IV) and Sabana Grande, Yauco, San German, Las Marias, and San Juan.  Forecast 123532 had expected this activity was likely in late April.

 

O:  1MAY2020 21:57:30  17.9N   66.9W ML=3.5  EMSC   PUERTO RICO REGION           

P: 24APR2020 123532    18.0N   67.0W 3.4-5.1 CAAAA  Puerto Rico                

 

 

MODERATE QUAKES SHAKE CHILE AND ARGENTINA

 

EARTHQUAKE SUMMARY FOR APRIL 30, 2020

 

The strongest earthquakes in the world today occurred in northern Chile and Argentina with an M 5.3-5.4 in Salta, Argentina and another M 5.3-5.4 in Antofagasta, Chile. They were not damaging in the epicentral regions. These continue similar activity in this area over the past several days which included an M 5.4 in northern Chile yesterday. This is the strongest activity in this region since an M 5.6 on September 30, 2019 and prior to that an M 5.7 on June 21, 2018. Forecast 123719 had expected this activity was likely at the end of April.

 

O: 30APR2020 09:23:11  22.8S   68.0W Mw=5.3  EMSC   ANTOFAGASTA, CHILE           

O: 30APR2020 09:23:11  22.8S   68.4W Mw=5.4  ANSS   ANTOFAGASTA, CHILE           

P: 29APR2020 123710    22.0S   69.0W 4.0-5.8 AAAAA  Coast No. Chile            

 

O:  1MAY2020 01:01:02  23.9S   67.1W Mw=4.8  EMSC   SALTA, ARGENTINA             

O: 30APR2020 22:10:32  24.0S   67.0W Mw=5.3  EMSC   SALTA, ARGENTINA             

O: 30APR2020 22:10:32  24.0S   66.9W Mw=5.4  ANSS   SALTA, ARGENTINA             

O: 30APR2020 18:57:44  24.0S   69.2W mb=4.7  EMSC   ANTOFAGASTA, CHILE           

P: 25APR2020 123710    24.0S   69.0W 4.0-5.7 BAAAA  Coast No. Chile             

 

An earthquake of M 5.3 also shook the region of Northern Sumatra, Indonesia today. NEIC reported this earthquake of M 5.0-5.3 in Northern Sumatra  was felt with intensity II-III in the area(s) of Northern Sumatra at Rantauprapat, Sibolga, Duri Riau, Klang and Malaysia. This is the strongest earthquake within about 200 km of this epicenter in Northern Sumatra since June 2-3, 2019 when a series of events including an M 5.8, 5.5 and 5.3 shook the region and the strongest within 100 km since an M 5.4 on March 11, 2019. Forecast 123485 had expected today's activity in Sumatra was likely around

April 27-30.

 

O: 30APR2020 08:20:24   1.2N   99.6E mb=5.3  EMSC   NORTHERN SUMATRA, INDONESIA  

P: 27APR2020 123485     0.0N   99.0E 4.0-5.8 BBAAA  So. Sumatera               

P: 29APR2020 123485     1.0N   98.0E 4.0-5.7 AABAA  So. Sumatera               

 

Seismicity continued at elevated levels near 140 E longitude today. The strongest of these events was an M 5.1 in Papua Indonesia at 139 East longitude. This was the largest event in the area within about 200 km of this epicenter since an M 5.7 on March 26, 2020 and an M 6.0 on January 18, 2020. Forecast 123507 had expected this event was likely within about 100 km around April 29. Today's event was likely enhanced by tidal stresses associated with the previous new moon.

 

O: 30APR2020 21:23:21   2.4S  138.7E Mw=5.0  EMSC   PAPUA, INDONESIA             

O: 30APR2020 21:23:21   2.4S  138.7E Mw=5.1  ANSS   PAPUA, INDONESIA             

P: 29APR2020 123507     2.0S  138.0E 4.0-5.5 AAAAA  West Irian, PNG            

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in Southern

Alaska.  NEIC reported this earthquake of M 3.8-4.0 in  Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska at Valdez, Chugiak and Girdwood.  This is the first event within about 150 km of this epicenter in Southern Alaska with M>=4.0 since an M 4.3 on October 16, 2018.

Forecast 123678 had expected today's activity was likely at the end of April.

 

O: 30APR2020 09:01:46  61.5N  146.3W ML=4.0  EMSC   SOUTHERN ALASKA              

P: 27APR2020 123678    60.2N  147.1W 3.2-5.3 BBAAA  Central Alaska             

 

 

LIGHT BISHOP, CALIFORNIA QUAKE REPEATS AFTER ONE YEAR

 

EARTHQUAKE SUMMARY FOR APRIL 29, 2020

 

 

The largest earthquake in the U.S. or Canada today was an M 3.6-3.7 in the Bishop, California area near Mammoth Lakes. NEIC reported this earthquake of M 3.7 in Central California  was felt with intensity II-III in the area(s) of Central California at Bishop, Big Pine, June Lake, and in Las Vegas, Nevada.

This is not an aftershock of the M 5.2 in the area of April 11, 2020 as it occurred about 100 km southeast of that epicenter. The last earthquake of equal or greater magnitude within about 50 km of today's epicenter occurred one year ago on April 29, 2019 with M 3.8. Forecast 123556 had expected today's event within about 10 km of the epicenter was likely around April 29.

 

O: 30APR2020 06:54:22  37.3N  118.4W Md=2.2  EMSC   CENTRAL CALIFORNIA

O: 29APR2020 12:16:04  37.3N  118.4W Md=2.3  EMSC   CENTRAL CALIFORNIA

O: 29APR2020 12:10:38  37.3N  118.4W ML=3.6  EMSC   CENTRAL CALIFORNIA           

P: 29APR2020 123556    37.3N  118.3W 2.5-4.8 AAAAA  California/Nevada area     

 

The largest earthquake in the world today was an M 5.2 off the coast of northern Honshu, Japan. NEIC reported this earthquake of M 5.2 off northern Honshu, Japan  was felt with intensity II-III in the area(s) of northern Honshu, Japan at Misawa, Aomori and Kamiiso, Hokkaido. This continues the series of events in the region near 140 East longitude which may have been promoted by tidal stresses associated with the last new moon. The last earthquake of M>=5.2 within about 150 km of today's epicenter was an M 5.2 on April 23, 2020 but the last of larger magnitude was an M 6.1 on August 28, 2019. Forecasts 123619 had expected today's event was likely around April 29 within about 100 km of this epicenter.

 

O: 30APR2020 03:15:22  40.9N  142.9E Mw=5.2  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 29APR2020 123619    40.0N  143.0E 3.5-5.4 AAAAA  Hokkaido, Japan            

 

A somewhat unusual earthquake of M 2.5 shook areas of eastern Tennessee and Kentucky today. This is the strongest earthquake within about 50 km of this epicenter since an M 2.7 about 50 km to the west on February 12, 2020 and prior to that an M 2.6 on August 5, 2019. Forecast 123573 had expected today's activity to the northeast around April 28.

 

NEIC reported this earthquake of M 2.5 in  Eastern Tennessee was felt with intensity II-III in the area(s) of Eastern Tennessee at Rutledge, Louisville and in Williamsburg, Kentucky.

 

 

O: 29APR2020 09:13:49  36.3N   83.5W Md=2.5  EMSC   EASTERN TENNESSEE            

P: 28APR2020 123573    37.2N   81.9W 2.0-3.9 AAAAA  Kentucky/Tennessee/NC      

 

The most active area in the western hemisphere today was the northern Caribbean. This began with an M 3.4 in the region of Haiti followed by an M 4.5 near Cuba about half an hour later and an M 3.7 after another half hour in the Dominican Republic followed by a series of aftershocks and an M 3.7 in the Puerto Rico Trench. The most unusual of these events was the M 4.5 in Cuba. It is the strongest earthquake within about 100 km near Cuba since an M 5.9 on October 7, 2018 and aftershocks of M 5.4. The last such event within about 50 km of this epicenter was an M 5.0 on September 30, 2016. This activity had been expected in forecasts 123536 and 123537 to occur around April 27-29. NEIC reported the earthquake of M 4.5 in Guantanamo, Cuba  was felt with intensity II-III in the area(s) of Guantanamo, Cuba.

 

O: 29APR2020 09:50:08  19.9N   73.4W ML=3.4  EMSC   HAITI REGION                 

O: 29APR2020 10:22:48  20.2N   74.2W mb=4.5  EMSC   CUBA REGION                  

P: 27APR2020 123537    20.0N   71.0W 3.0-4.8 AACAA  Bahamas/No. Caribbean      

 

O: 30APR2020 00:42:36  19.6N   65.4W Md=3.7  EMSC   PUERTO RICO REGION           

P: 29APR2020 123536    20.0N   66.0W 3.0-4.4 AAAAA  Bahamas/No. Caribbean      

 

O: 29APR2020 11:07:17  19.7N   70.5W ML=3.7  EMSC   DOMINICAN REPUBLIC           

P: 27APR2020 123537    20.0N   71.0W 3.0-4.8 AAAAA  Bahamas/No. Caribbean      

 

MODERATE EARTHQUAKE SHAKES ARGENTINA AND CHILE

 

EARTHQUAKE SUMMARY FOR APRIL 28, 2020

 

The strongest earthquake in the world today was an M 5.4 in Salta, Argentina. NEIC reported it was felt with intensity II in Antofagasta, Chile. GUC reported this earthquake was felt with intensity III in  Antofagasta at Antofagasta, Calama, Maria Elena, Mejillones, Sierra Gorda; Atacama at Diego de Almagro, Chile. This is the strongest earthquake in Argentina within about 200 km of this epicenter since an M 5.7 on June 21, 2018 and prior to that an M 6.3 on April 15, 2017. The mainshock was preceded by a moderate M 4.0 foreshock earlier in the day in Antofagasta, Chile. Forecast 123710 had expected today's event to the west of the epicenter was likely around April 25.

 

O: 28APR2020 11:20:26  23.2S   67.3W ML=4.0  EMSC   ANTOFAGASTA, CHILE           

O: 29APR2020 05:37:15  24.3S   67.1W Mw=5.4  EMSC   SALTA, ARGENTINA             

O: 29APR2020 05:37     24.2S   67.7W mb=5.4  GUC    Antofagasta at Antofagasta, Ca

P: 25APR2020 123710    24.0S   69.0W 4.0-5.7 BAAAA  Coast No. Chile            

 

 

The strongest earthquake in the U.S. or Possessions today was an M 3.9 north of Puerto Rico in the Puerto Rico Trench. The last event within about 100 km of this epicenter in Puerto Rico of larger magnitude was an M 4.4 on December

28, 2019 and prior to that an M 4.6 on October 7, 2019. Two events of M 3.9 have occurred in the area in the past month - on April 8 and March 29. The area is overdue for a major earthquake but this is most likely in conjunction with a major solar flare of hurricane and not immediate. Forecast 123536 had expected today's activity in this area around April 29.

 

O: 28APR2020 07:40:44  19.6N   65.3W Md=3.9  EMSC   PUERTO RICO REGION           

P: 29APR2020 123536    20.0N   66.0W 3.0-4.4 AAAAA  Bahamas/No. Caribbean      

 

The second strongest earthquake in the world today was an M 5.0 in the northern mid-Atlantic Ridge. This is the strongest event within about 200 km of this epicenter in nearly a year - since an M 5.2 on June 14, 2019. An M 5.3-5.4 also hit the area a year ago on April 30, 2019. Forecast 123525 had expected today's event in this area was likely around April 29.

 

O: 28APR2020 12:02:33  13.3N   44.8W mb=5.0  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 29APR2020 123525    15.0N   46.0W 4.0-5.6 ABAAA  Mid-Atlantic Ridge         

 

NEW BRITAIN STILL ACTIVE

 

EARTHQUAKE SUMMARY FOR APRIL 27, 2020

 

On a quiet day in global seismicity, the strongest activity continued within about 12 degrees of 140 East longitude. This longitude has seen high seismicity during the period of the last new moon including events of M 6.3 in Honshu, Japan; M 6.6 in the Bonin Islands, Japan and an M 6.3 in New Britain. The largest earthquake in the world today was an M 5.4 in New Britain about 250 km northwest of the M 6.3. It was not reported felt in this remote epicentral region. This area has seen a number of moderate events in the past month but the M 5.4 is the only one at this magnitude level. An M 5.2 yesterday was probably a foreshock. Forecasts 123495 and 123497 had expected this activity was likely at the end of April.

 

O: 27APR2020 08:40:43   3.8S  151.3E Mw=5.4  EMSC   NEW IRELAND REGION, P.N.G.   

P: 25APR2020 123497     6.0S  151.0E 4.0-5.6 ACAAA  New Ireland                

P: 29APR2020 123495     5.0S  152.0E 4.0-5.4 ABAAA  New Britain                 

 

An earthquake of M 5.2 in Samoa was the only other event in the world today of

M>=4.8. Forecast 123703 had expected this event within about 100 km was likely around April 27.

 

O: 28APR2020 00:13:42  16.4S  173.0W mb=5.2  EMSC   SAMOA ISLANDS REGION         

P: 27APR2020 123703    16.0S  174.0W 4.0-5.7 AAAAA  Tonga Islands              

 

The strongest earthquakes in the U.S. or Canada today occurred in Alaska with M 3.5-3.6 in the Fox Islands, the Alaska Peninsula and the Kenai Peninsula. This activity had been expected around the end of April in forecasts 123677 and 123663. None of these events area unusual and were not felt in these remote areas.

 

O: 27APR2020 18:21:40  53.3N  166.4W mb=3.6  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 24APR2020 123663    53.9N  165.3W 3.5-5.1 BAAAA  Fox Islands, Aleutians     

 

O: 27APR2020 23:53:56  58.9N  154.3W ML=3.5  EMSC   ALASKA PENINSULA             

P: 28APR2020 123677    60.1N  153.4W 3.2-4.9 ABAAA  Central Alaska             

 

NEIC reported the earthquake of M 3.3-3.6 in the Kenai Peninsula, Alaska  was felt with intensity II-III in the area(s) of the Kenai Peninsula, Alaska at Kasilof, Soldotna and Homer.

 

O: 28APR2020 03:50:46  60.3N  151.6W ML=3.6  EMSC   KENAI PENINSULA, ALASKA      

P: 28APR2020 123677    60.1N  153.4W 3.2-4.9 AAAAA  Central Alaska             

 

The strongest earthquake in or near California today was an M 3.3 off the coast of Baja California. This is the first earthquake within about 50 km of this  epicenter with M>=3.3 since an M 3.4 a year ago on April 22, 2019 near the same epicenter. Forecast 123590 had expected today's event within about 10 km was likely around April 23.

 

O: 27APR2020 21:42:43  32.0N  117.3W ML=3.3  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 23APR2020 123590    32.0N  117.4W 2.5-4.5 BAAAA  So. California             

 

 

JAPAN CONTINUES TO SEE ELEVATED SEISMICITY

 

EARTHQUAKE SUMMARY FOR APRIL 25, 2020

 

Seismicity at 140 East longitude continued at elevated levels today in response to the tidal stresses which maximized at that longitude in the new moon as noted in previous issues of this summary:

 

"The new moon  arrived at 02:26 UT on April 23, 2020. Longitudes which are sub-lunar at this time are near 40 West and those sub-solar at 140 East longitude. These include the Bonin Islands north to Honshu and the Kurils and south to eastern Indonesia in the east and the central Atlantic in the west. These areas could see significant tidal triggering in the next week including the possibility of a large to major event in eastern Indonesia or Japan/Kurils in the period April 23-27." (April 20-24, 2020)

 

An M 4.9-5.0 in the Tokyo area of Honshu, Japan was among the events at 140.0 East longitude. NEIC reported maximum intensity VI in Ibaraki, Japan with V in Tochigi, and Saitama; IV in Chiba, and II-III in Tokyo. An M 4.9 also occurred west of this in eastern Honshu today. A similar M 5.0-5.1 quake occurred near today's Tokyo event on April 11, 2020 following two such events on January 31,, 2020. The last in the region of significantly larger magnitude was an M 5.9 on July 7, 2018. Forecast 123586 had expected today's event was likely around April 26.

 

O: 26APR2020 00:49:11  36.1N  140.0E mb=5.0  EMSC   EASTERN HONSHU, JAPAN        

P: 26APR2020 123586    37.0N  141.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

The event to the west of Tokyo today of M 4.9 had been expected at the end of April in forecast 123581.

 

O: 25APR2020 17:22:30  36.2N  137.7E ML=4.9  EMSC   EASTERN HONSHU, JAPAN        

P: 29APR2020 123581    37.0N  139.0E 3.5-5.0 BAAAA  No. Honshu, Japan          

 

Two unusual earthquakes with M 2.8 each occurred in the eastern U.S. today. The first of these was an M 2.9 near Portsmouth, Ohio. NEIC reported it was felt in Ohio with intensity II-III in Portsmouth, Franklin Furnace, West Portsmouth, Wheelersburg, Minford, and Chillicothe and in Kentucky at Ashland, Russell, Greenup, and South Shore. No damage was reported.   This is the strongest earthquake in Ohio within about 150 km of this epicenter since an M 3.4 on

May 24, 2017. Forecast 123641 had expected today's event was likely at the end of April in this region northwest of today's epicenter.

 

O: 25APR2020 10:33:48  38.8N   83.0W mb=2.8  EMSC   OHIO                         

P: 29APR2020 123641    40.0N   84.0W 2.0-4.2 BBAAA  Ohio/Lake Erie             

 

The other was an M 2.8 in Southeastern Missouri. NEIC reported it was felt with intensity II-III in Missouri at Charleston, Cape Girardeau, Jackson, Millersville, Saint Louis, Ballwin, and in Illinois at Mounds, New Berlin. The last event within about 50 km of today's epicenter with M>=2.8 occurred on October 12, 2019 about 50 km to the southwest of today's epicenter. Forecast 123579 had expected today's event to the southwest was likely around April 24.

 

O: 25APR2020 09:29:07  36.9N   89.2W mb=2.8  EMSC   SOUTHEASTERN MISSOURI        

P: 24APR2020 123579    36.3N   89.5W 2.0-4.0 AAAAA  New Madrid area            

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 east of the Fox Islands in the Unimak Island region. It was not reported felt in this remote area. The only event of equal or greater magnitude in this region in the past six months was a similar M 4.4 on March 1, 2020 about 250 km to the northeast of today's epicenter. The last such event within about 100 km of today's epicenter was an  M 4.8 on September 27, 2019. Forecast 123673 had expected today's event was likely around April 28.

 

O: 26APR2020 04:20:28  53.4N  164.6W mb=4.4  EMSC   UNIMAK ISLAND REGION, ALASKA 

P: 28APR2020 123673    54.1N  164.4W 3.5-5.1 AAAAA  Unimak Islands, Aleutians  

 

EXPECTED M 6.3 SHAKES NEW GUINEA

 

EARTHQUAKE SUMMARY FOR APRIL 24, 2020

 

A strong M 6.2-6.3 earthquake occurred today in eastern Indonesia in Papua New Guinea. NEIC reported it was felt lightly in Port Moresby, New Guinea. The last earthquake in the world of magnitude greater than 6.6 was an M 7.5 one month ago on March 25, 2020 in the Kuril Islands, also associated with a new moon. In the month of April, 2020, the only earthquakes of M>=6.3 in the world have been the M 6.3 in Honshu, Japan on April 19 and the M 6.6 in the Bonin Islands, Japan on April 18 - both at 140-141 East longitude. Today's earthquake had been expected at this time in the tidal forecast published previously in this summary as:

 

"The new moon  arrived at 02:26 UT on April 23, 2020. Longitudes which are sub-lunar at this time are near 40 West and those sub-solar at 140 East longitude. These include the Bonin Islands north to Honshu and the Kurils and south to eastern Indonesia in the east and the central Atlantic in the west. These areas could see significant tidal triggering in the next week including the possibility of a large to major event in eastern Indonesia or Japan/Kurils in the period April 23-27." (April 20-24, 2020)

 

Today's event occurred within about an hour of local solar noon and was nearly sub-solar at the time of occurrence, strongly suggesting a tidal influence in the timing and magnitude of this event. The last earthquake within about 250 km  of this epicenter with M>=6.3 occurred as an M 7.9 on January 22, 2017 - a great tsunamigenic quake. It may be the strongest aftershock to date of that event. Forecast 123495 had expected today's activity around April 22.

 

O: 25APR2020 02:53:08   6.5S  154.2E Mw=6.2  EMSC   BOUGAINVILLE REGION, P.N.G.  

O: 25APR2020 02:53:05   6.5S  154.3E Mw=6.3  ANSS   BOUGAINVILLE REGION, P.N.G.  

P: 22APR2020 123495     6.0S  152.0E 4.0-5.6 BABAA  New Britain                

 

An unusual shallow focus earthquake also shook areas of Romania and Ukraine today. This event of M 4.9 was reported felt in Romania with V at Focsani, Brancea; IV in Tecuci Galati, Braila and II-III in Cosmesti, Fitionesti, Letea, Bacau, and Berca and in Ukraine at Izmayil Odeska. Most moderate or large earthquakes in the region occur at intermediate depths between 130 and 160 km. The last shallow focus earthquake within about 200 km of this epicenter with M>=4.9 occurred on November 22, 2014 with M 5.5 at 39 km depth. This was the shallowest and farthest east of Romanian quakes in the past 30 years, surpassed only by today's event at 10 km depth and about 50 km east of previous such activity in the region.  Forecast 123646 had expected today's event was likely between April 22 and 29. It is likely today's quake was promoted by the new moon tidal stresses as it occurred within about 10 minutes of local solar midnight, a time when tidal stresses are maximized.   The Romanian quake of November 22, 2014 also coincided with strong quakes in Honshu, Japan and a new moon as noted in this summary at the time:

 

"The timing and locations of these events suggests triggering effects from the  current geomagnetic storm combined with tidal stresses from the new moon alignment were instrumental in promoting these events at this time.

 

and

 

An unusual earthquake of M 5.5 also hit the region of Romania today. As most earthquakes of M>5 in this region occur at intermediate focal depth, the shallow nature of this earthquake is very unusual. This is the first shallow earthquake within 300 km of this epicenter of M>=5.5 in at least 25 years. The last intermediate quake of this size in the area occurred as an M 5.8-5.9 on October 27, 2004. The only other such activity in the past 25 years was an intermediate focus event on May 30 and 31, 1990 of M 7.0 and an aftershock of M 6.3." (November 23, 2014)

 

O: 24APR2020 22:04:18  45.9N   27.5E mb=4.9  EMSC   ROMANIA                      

P: 22APR2020 123646    46.0N   26.0E 3.0-5.1 AAAAA  Romania/NW Turkey          

P: 29APR2020 123646    46.0N   27.0E 3.0-5.3 BAAAA  Romania/NW Turkey          

 

Aftershocks continued to be felt in southern Idaho today nearly a month after an M 6.5 there on March 31. Today's activity included an M 3.6 and 3.7 felt with intensity II-III in Idaho at Lowman, Challis, Boise, Meridian, Parma and Hayden.

An M 4.2 and 4.0 event in this aftershock sequence were the strongest earthquakes in the U.S. or Canada today. Forecast 123628 had expected today's activity was likely around April 24. Following is a listing of aftershocks of M>=3.0 in Southern Idaho today. A more complete listing of events of M>=2 is found in the Rocky Mountain regional section of this summary below.

 

O: 24APR2020 07:03:18  44.3N  115.1W Ml=3.0  EMSC   SOUTHERN IDAHO

O: 24APR2020 06:50:27  44.3N  115.1W Ml=3.7  EMSC   SOUTHERN IDAHO

O: 24APR2020 16:12:31  44.3N  115.2W ML=3.3  EMSC   SOUTHERN IDAHO

O: 24APR2020 15:16:29  44.3N  115.2W Ml=3.6  EMSC   SOUTHERN IDAHO

O: 24APR2020 16:51:50  44.4N  115.2W Ml=3.0  EMSC   SOUTHERN IDAHO

O: 25APR2020 04:03:19  44.4N  115.2W Ml=3.0  EMSC   SOUTHERN IDAHO

O: 24APR2020 09:02:25  44.4N  115.2W Ml=3.7  EMSC   SOUTHERN IDAHO

O: 25APR2020 02:09:33  44.5N  115.2W Ml=4.2  EMSC   SOUTHERN IDAHO

O: 24APR2020 11:40:14  44.6N  115.3W Ml=4.0  EMSC   SOUTHERN IDAHO

P: 24APR2020 123628    44.5N  115.1W 2.0-4.0 AAAAA  Montana/Idaho               

 

An unusually large earthquake of M 3.0 was felt in the area of Sudbury, Ontario Canada today according to Earthquakes Canada. This is the strongest earthquake within about 200 km of this epicenter since an M 3.1 on February 8, 2019 and a similar M 3.0-3.1 on September 30, 2015. Today's event may have been promoted by tidal stresses associated with the new moon. Forecast 123641 had expected this event to the north was likely around April 27.

 

O: 25APR2020 01:44:46  46.5N   80.8W MB=3.0  ECAN of Sudbury, ON   

O: 25APR2020 01:44:46  46.5N   80.8W ML=3.0  EMSC   ONTARIO, CANADA              

P: 27APR2020 123641    49.0N   81.0W 2.0-4.0 ACAAA  Ohio/Lake Erie             

 

LIGHT EARTHQUAKES SHAKE SLOVAKIA AND CROATIA

 

EARTHQUAKE SUMMARY FOR APRIL 23, 2020

 

A pair of light earthquakes of M 3.5 and 3.7 were widely felt in Croatia and Slovakia in eastern Europe today. The event in Croatia is probably an aftershock of the M 5.4 in that region of March 22. Aftershocks of M 3.7 and 5.0 were recorded on March 22 and 23, but this is the strongest aftershock since that time more than a month ago. Forecasts 123356 and 123612 had expected this activity in Croatia was likely around April 20-25.

 

NEIC reported this earthquake of M 3.5 in Croatia  was felt with intensity II-III in the area(s) of Croatia at Zagreb.

 

O: 23APR2020 07:52:34  45.8N   16.0E ML=3.5  EMSC   CROATIA                      

P: 20APR2020 123356    44.0N   16.0E 3.0-5.1 BBAAA  Italy                      

P: 25APR2020 123612    44.0N   18.0E 3.0-4.9 ABBAA  Adriatic Sea               

 

The earthquake in Slovakia about 500 km northeast of Croatia of M 3.7 was also widely felt.  NEIC reported this earthquake of M 3.7 in Slovakia  was felt with intensity II-IV in the area(s) of Slovakia at Michalovce, Strazske, Galszec, Kosice, Presov. The event occurred near local solar midnight and may have been promoted by the new moon and/or by the recent geomagnetic storm at high latitudes.  The last earthquake of equal or larger magnitude recorded in Slovakia was an M 4.7 on October 2, 2011. The event on October 2, 2011 prompted this summary to note in this regard:

 

"This is a relatively typical pattern for seismicity following a strong geomagnetic storm such as occurred 2-3 days ago. A global seismic watch continues in effect for high and low latitudes for the next three days through October 4." (October 2, 2011)

 

Forecast 123646 had expected today's activity near Slovakia was likely to the southeast around April 22.

 

O: 23APR2020 23:18:27  48.8N   21.9E ML=3.7  EMSC   SLOVAKIA                     

P: 22APR2020 123646    46.0N   26.0E 3.0-5.1 ACCAA  Romania/NW Turkey          

 

The strongest earthquake in the world today was an M 5.5 in Chiapas, Mexico. The last event of larger magnitude in Chiapas was an M 5.8 on December 23, an aftershock of an M 6.3 of November 20, 2019 but an M 5.5-5.6 on February 2, 2020 is the last such event of equal magnitude in the region. Forecast 123512 had expected today's event in Chiapas was likely around April 23.

 

O: 23APR2020 14:50:16  14.2N   92.5W ML=4.1  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 23APR2020 15:00:49  14.8N   92.2W ML=4.0  EMSC   CHIAPAS, MEXICO

O: 24APR2020 00:30:39  14.0N   93.1W Mw=5.5  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 23APR2020 123512    15.0N   94.0W 3.5-5.2 AAAAA  Chiapas, Mexico            

 

Seismicity was again elevated in the region of Japan near 140 degrees longitude. This was an M 5.2 felt in the Hokkaido region of northern Japan.  NEIC reported this earthquake of M 5.2 in Hokkaido, Japan  was felt with intensity II-III in the area(s) of Hokkaido, Japan at Misawa. It is the strongest earthquake in Hokkaido, Japan in at least six months. The last event of M>=5.2 in Hokkaido was an M 6.1 on August 28, 2019. An event of M 5.3 hit about 300 km southeast of today's epicenter on November 29, 2019. Forecast 123619 had expected today's event in this area was likely around April 26. This appears to be related to regional activation of Japan in the past week which has included an M 6.6 in the Bonin Islands and an M 6.3 off the coast of eastern Honshu. This was probably promoted by the new moon today as noted in this and previous summaries:

 

 

"The new moon  arrived at 02:26 UT on April 23, 2020. Longitudes which are sub-lunar at this time are near 40 West and those sub-solar at 140 East longitude. These include the Bonin Islands north to Honshu and the Kurils and south to eastern Indonesia in the east and the central Atlantic in the west. These areas could see significant tidal triggering in the next week including the possibility of a large to major event in eastern Indonesia or Japan/Kurils in the period April 23-27." (April 20-24, 2020)

 

The region of eastern Indonesia and New Guinea noted in this forecast has not shown significant activity in this cycle, but several days are still left in the forecast period and a strong quake is still possible in this region.

 

O: 23APR2020 19:52:28  41.5N  142.0E Mw=5.2  EMSC   HOKKAIDO, JAPAN REGION       

P: 26APR2020 123619    43.0N  141.0E 3.5-5.6 BBAAA  Hokkaido, Japan            

 

A pair of moderate earthquakes today in the world's ocean ridges may also have been related to tidal stresses with the new moon. The largest of these was an M 5.4 in the South Pacific Ocean which occurred near local solar midnight. An M 4.7 also occurred south of India today within about a minute of local solar noon and was probably promoted by tidal stresses. This event is  the strongest within about 300 km of this epicenter since an M 5.5 on March 10, 2019 and prior to that an M 5.5 on May 13, 2012.

 

 

O: 24APR2020 05:58:12   6.3S   89.7E ML=4.7  EMSC   SOUTH INDIAN OCEAN           

 

The event in the South Pacific is the largest within about 300 km of that epicenter since an M 6.1 on July 11, 2004. At the time this summary noted in regard to the history of regional seismicity:

 

"The South Pacific Ocean continued at very active rates today with a highly unusual earthquake of M 6.1 in the South Pacific Ocean about 1000 km west of the East Pacific Rise. This earthquake is the strongest recorded in the region 15-25S 120-130W since an earthquake of M 5.2 was recorded in this are on Jan. 14, 2004, the only earthquake NEIC has listed in this region in the past four years. The only earthquake of larger size ever recorded in the region occurred as an M 6.8-6.9 on Nov. 22, 1955 about 600 km to the southeast of today's earthquake. A series of strong and moderate earthquakes struck the South Pacific Ocean for the three days prior to this earthquake and represented a strong activation of this region. (This summary) has been emphasizing this activity in our previous two summaries. The exact antipode of the new M 6.1 in the South Pacific Ocean is 20N 53W indicating that the area of southern Iran and the Owen Fracture zone which is in this antipodal may see enhanced activity over the next five days" (July 11-12, 2004)

 

Today's event follows an M 5.0 in the Gulf of Aden yesterday (April 22) near the antipode.

 

O: 24APR2020 05:41:56  19.8S  126.7W Mw=5.4  EMSC   SOUTH PACIFIC OCEAN          

 

The strongest earthquake in the U.S. or Canada today continued to occur in the

western Fox Islands, Aleutians, Alaska with M 4.1 and 3.6. A series of recent events in the area about 100 km to the east of today's epicenter in the Fox Islands has occurred in late April, 2020. The largest of these was an M 4.6 on April 20. Forecast 123660 had expected today's activity was likely in this area around April 25.

 

O: 23APR2020 18:52:30  51.4N  170.7W mb=4.1  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 23APR2020 18:22:15  51.5N  170.6W mb=3.6  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 25APR2020 123660    52.4N  170.7W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

 

TIDAL STRESSES RELEASE TECTONIC STRESSES

 

EARTHQUAKE SUMMARY FOR APRIL 22, 2020

 

The new moon arrived today and was associated with a number of earthquakes

which appear to have been promoted by tidal stresses associated with this event.

Most of the earthquakes in the world today occurred within about 12 degrees

of 140 East longitude as expected in the tidal seismicity forecast in previous

issues of this summary:

 

"The new moon  arrived at 02:26 UT on April 23, 2020. Longitudes which are sub-lunar at this time are near 40 West and those sub-solar at 140 East longitude. These include the Bonin Islands north to Honshu and the Kurils and south to eastern Indonesia in the east and the central Atlantic in the west. These areas could see significant tidal triggering in the next week including the possibility of a large to major event in eastern Indonesia or Japan/Kurils in the period April 23-27.." (April 19-23, 2020)

 

More than one-third of today's events of M>=4 (15 of 38) occurred in the limited longitude range between 128 and 150 East  longitude. In addition, the largest earthquakes of the day occurred within minutes of local solar noon or local solar midnight in Tonga (5.5, 5.1); the Loyalty Islands (M 5.0); Honshu, Japan (M 5.2) and the Gulf of Aden (M 5.0). Vertical solid earth tidal stresses maximize at these hours and these events were probably promoted by these enhanced stresses.

 

The strongest earthquake in the world today was an M 5.5 in Tonga. NEIC reported it was felt with intensity V in Neiafu, Vavau, Tonga and III in Vaini and Tofoa-Koloua, Tonga. This event was followed by an M 5.1 to the north also in Tonga which occurred within about 15 minutes of local solar noon and was probably promoted by tidal stresses which maximize at this hour. The M 5.5 is the strongest in the region of Tonga within about 200 km of this epicenter since an M 6.1 on June 15, 2019 about 200 km to the southeast of today's epicenter. The last such event within about 100 km was an M 5.5 on November 6, 2018. Forecast 123450 had expected today's activity in mid-April. The M 5.5 in Tonga is at 103 degrees from the M 7.7 south of Cuba of January 28, a distance which suggests promotion from that source.

 

O: 22APR2020 23:19:33  19.2S  173.4W mb=5.1  EMSC   TONGA                        

O: 22APR2020 22:31:24  22.1S  175.5W Mw=5.5  EMSC   TONGA REGION                 

P: 16APR2020 123450    20.0S  174.0W 4.0-5.6 CAAAA  Tonga Islands              

 

Another event of M>=5 occurred today in the area near New Caledonia southeast of the Loyalty Islands with M 5.0. This quake also occurred within about 30 minutes of local solar midnight and was probably promoted by tidal stresses. The last earthquake within about 150 km of today's epicenter with M>=5.0 in the Loyalty Islands was an M 5.6 on March 29, 2020 and a month before that an M 5.1 on February 29, 2020.  Forecast 123711 had expected today's event within about 100 km was likely around April 24.

 

NEIC reported this earthquake of M 5.0 in Southern Vanuatu  was felt with intensity II-III in the area(s) of Southern Vanuatu at Noumea, New Caledonia.

 

 

O: 22APR2020 13:00:29  21.1S  169.6E mb=5.0  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 24APR2020 123711    22.0S  169.0E 4.0-5.6 AAAAA  Loyalty Islands            

 

An M 5.2 in eastern Honshu at 138 East longitude followed a series which began at about 12:30 local solar time - near local noon. Aftershocks of M 4.6 and 4.5 followed.  NEIC reported the earthquake of M 4.6 in Eastern Honshu, Japan  was felt with intensity II-III in the area(s) of Eastern Honshu, Japan in Aichi and Shiga.  NEIC reported the earthquake of M 5.2 in Eastern Japan was felt with intensity II-III in the area(s) of Eastern Japan in Nagano, Gifu, Aichi, Tokyo, and Kanagawa. NEIC reported the earthquake of M 4.3 off eastern Honshu, Japan  was felt with intensity II-III in the area(s) off eastern Honshu, Japan in Fukushima. The M 5.2 is the strongest within about 150 km of this epicenter in north-central Honshu since an M 6.2 on November 22, 2014. Most recent activity in the general area has concentrated near Tokyo with a series of event of M 5.2-5.4 in 2015-2017. An M 5.2 hit about 150 km to the northwest of today's epicenter on March 12, 2020, the only such event in the region since 2014.

Forecast 123315 had expected moderate activity in this area around April 18.

 

O: 23APR2020 04:44:23  36.2N  137.7E Mw=5.2  EMSC   EASTERN HONSHU, JAPAN

O: 23APR2020 04:57:55  36.2N  137.7E mb=4.6  EMSC   EASTERN HONSHU, JAPAN

O: 23APR2020 03:26:50  36.9N  140.8E mb=4.3  EMSC   NEAR EAST COAST OF HONSHU, JAPAN

O: 23APR2020 04:52:30  36.2N  137.7E ML=4.5  EMSC   EASTERN HONSHU, JAPAN        

P: 18APR2020 123315    37.0N  139.0E 3.5-4.9 BAAAA  No. Honshu, Japan          

 

An unusually large M 5.0 also occurred today in the Gulf of Aden south of Iran. It occurred within about 10 minutes of local solar midnight with the new moon and was probably promoted by tidal stresses associated with that alignment. The last event to occur with M>=5.0 within about 150 km of this epicenter was an M 5.9 on July 15, 2018. Forecast 123244 had expected today's event was likely within about 100 km around April 20.

 

O: 22APR2020 20:22:47  13.7N   51.6E mb=5.0  EMSC   GULF OF ADEN                 

P: 20APR2020 123244    13.0N   51.0E 3.5-5.1 AAAAA  Gulf of Aden                

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Kodiak Island region of Alaska. This is an aftershock of the M 5.2-5.3 event at this epicenter of April 17. It was not reported felt in the area. Forecast 123657 had expected continuing seismic events in the area around April 22.

 

O: 22APR2020 15:34:14  56.0N  153.3W mb=4.2  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 22APR2020 123657    54.7N  156.9W 3.5-5.3 ABBAA  Alaska Peninsula           

 

LIGHT EARTHQUAKES SHAKES LOS ANGELES OVERNIGHT

 

EARTHQUAKE SUMMARY FOR APRIL 21, 2020

 

A light M 3.7 earthquake was widely felt in the area of Los Angeles, California today. NEIC reported it was centered near Inglewood and felt with maximum intensity IV in Los Angeles, Inglewood, Culver City, Compton, Lynwood, Maywood, South Gate, Santa Monica and many other communities within Southern California within about 100 km of the epicenter. The mainshock was preceded by an M 2.0 near local noon 11 hours earlier. It occurred near local solar midnight and may have been promoted by effects from the new moon which arrives tomorrow and by the geomagnetic storm of April 20 as noted in previous issues of this report:

 

 

"The geomagnetic field saw disturbed conditions today. The AP level was 18.  High latitude geomagnetic field  saw  stormy conditions  with AP at 39. This storm began early in the day and peaked about 12:00-15:00 UT. It is the strongest  geomagnetic storm since October 26, 2019 when AP reached 26. Strong geomagnetic storms can help promote enhanced seismicity at sub-solar and anti-solar longitudes (in this case near 0W and 180W longitude), near the geomagnetic equator and at high latitudes in the several days following such disturbances." (April 20, 2020)

 

and

 

"The new moon will arrive at 02:26 UT on April 23, 2020. Longitudes which are sub-lunar at this time are near 40 West and those sub-solar at 140 East longitude. These include the Bonin Islands north to Honshu and the Kurils and south to eastern Indonesia in the east and the central Atlantic in the west. These areas could see significant tidal triggering in the next week." (April 18-21, 2020)

 

Today's event of M 3.7 is the strongest within Los Angeles, California within about 50 km of the epicenter since an M 3.8 on May 3, 2015. An M 3.6 last hit the area slightly outside 50 km of today's epicenter to the northwest in the Northridge area on January 22, 2020. The strongest quake in the past six years in the area within about 75 km of this epicenter was an M 5.1 on March 29, 2014.  Forecast 123328 had expected today's event within about 10 km of this epicenter was likely around April 18.

 

O: 22APR2020 07:03:47  34.0N  118.3W ML=3.6  EMSC   GREATER LOS ANGELES AREA, CALI

O: 21APR2020 16:44:30  34.0N  118.4W Ml=2.1  EMSC   GREATER LOS ANGELES AREA, CALI

P: 18APR2020 123328    33.9N  118.3W 2.5-4.6 BAAAA  So. California             

 

The strongest earthquakes in the U.S. or Canada today occurred in the Aleutians of Alaska with M 3.9 in the Rat Islands and in the Fox Islands. Neither of these was reported felt in these remote epicentral areas. The M 3.9 in the Fox Islands follows an M 4.6 yesterday in the area to the east of this but also in the Fox Islands, Alaska. In the previous summary it had been noted in this regard:

 

 

"The M 4.6 in the Fox Islands, Aleutians, Alaska was the strongest in the U.S. or Canada today. The last shallow focus earthquake within about 150 km of this epicenter in the Fox Islands with equal or greater magnitude occurred, like the event in Baffin Bay, in association with the strong geomagnetic storm of October,  2019 - on October 26, 2019. Today's event may be an aftershock of that. Forecast 123393 had expected today's event in this region in the Fox Islands was likely around April 19." (April 20-21, 2020)

 

The M 3.9 in the Rat Islands was not unusual. The last such event in the area was an M 4.0 on April 17, 2020. Forecast 123399 had expected this activity in mid-April.

 

O: 21APR2020 16:49:13  50.7N  179.8E mb=3.9  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 16APR2020 123399    51.0N  178.0E 4.0-5.6 BABAA  Rat Islands                

 

O: 21APR2020 18:17:54  51.7N  170.8W mb=3.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 19APR2020 123393    51.9N  169.2W 3.5-5.2 AAAAA  Fox Islands, Aleutians     

 

The strongest earthquake in the world today was an M 5.3 in the Kuril Islands. It was not reported felt in this remote area, but is not a classical aftershock of the M 7.7 on March 25 which occurred northeast of today's epicenter. The last earthquake within about 200 km of today's event with M>=5.3 occurred as an M 5.8 on March 7, 2018 about 150 km to the southwest. The last such event nearer to today's epicenter was an M 5.3 on May 11, 2015. Forecast 123363 had expected today's activity was likely around April 19. This epicenter is at 60 degrees (node 6) from the M 6.5 in Southern Idaho of March 31 and may have been promoted by energy from that source

 

O: 22APR2020 06:51:01  46.5N  153.4E mb=5.3  EMSC   KURIL ISLANDS                

P: 19APR2020 123363    47.0N  155.0E 3.5-5.6 BAAAA  NE Pacific                 

 

Moderate earthquakes of M 4.7 in Leyte and M 4.5 and 4.2 in Mindoro hit the Philippines today. These area located near the geomagnetic equator and may be related to the geomagnetic storm yesterday. The Mindoro events are near a volcanic area and may indicate a resurgence of seismicity in that area. This series began with an M 4.0 within minutes of local solar noon and may have also been promoted by tidal effects associated with the new moon. Forecasts 123255 and 123256 had expected this activity within about 100 km of these epicenter. These epicenters area at 103 degrees from the M 6.5 in Southern Idaho of March 31 and may have been promoted by energy from that source.

 

NEIC reported this earthquake of M 4.7 in Leyte, Philippines  was felt with intensity II-III in the area(s) of Leyte, Philippines at Tanauan Eastern Visayas.

 

O: 21APR2020 21:43:05  10.5N  125.2E mb=4.7  EMSC   LEYTE, PHILIPPINES           

P: 19APR2020 123255    10.0N  125.0E 3.5-4.9 AAAAA  Luzon, Philippines         

 

O: 22APR2020 03:06:25  13.7N  120.9E ML=4.5  EMSC   MINDORO, PHILIPPINES

O: 22APR2020 02:36:19  13.8N  120.9E ML=4.2  EMSC   MINDORO, PHILIPPINES

O: 22APR2020 03:51:36  13.7N  120.9E ML=4.0  EMSC   MINDORO, PHILIPPINES         

P: 17APR2020 123256    13.0N  122.0E 3.5-5.0 BAAAA  Luzon, Philippines         

 

 

 

 

HIGH LATITUDE GEOMAGNETIC STORM MAY REFRESH SEISMICITY

 

EARTHQUAKE SUMMARY FOR APRIL 20, 2020

 

Readers have probably seen on your screens or heard of the aurora today that was clearly visible at high southern latitudes (New Zealand) and high northern latitudes (northern Europe, U.S/Canada). These were associated with the strongest geomagnetic disturance at high latitudes in nearly 6 months. Increases in seismicity may be associated with this storm as noted in this issue:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 18.  High latitude geomagnetic field  saw  stormy conditions  with AP at 39. This storm began early in the day and peaked about 12:00-15:00 UT. It is the strongest  geomagnetic storm since October 26, 2019 when AP reached 26. Strong geomagnetic storms can help promote enhanced seismicity at sub-solar and anti-solar longitudes (in this case near 0W and 180W longitude), near the geomagnetic equator and at high latitudes in the several days following such disturbances." (April 20, 2020)

 

This, in conjunction with the new moon of April 23, may lead to enhanced seismicity along the eastern Pacific rim as noted in previous issues of this summary in the tidal forecast for this new moon:

 

"The new moon will arrive at 02:26 UT on April 23, 2020. Longitudes which are sub-lunar at this time are near 40 West and those sub-solar at 140 East longitude. These include the Bonin Islands north to Honshu and the Kurils and south to eastern Indonesia in the east and the central Atlantic in the west. These areas could see significant tidal triggering in the next week." (April 18-21, 2020)

 

Unusual high latitude seismicity accompanied today's storm in Baffin Bay, Canada (M 4.1); Alberta, Canada (M 2.6), Northern Alaska (M 4.1, 4.0) and the Fox Islands, Alaska (M 4.6). The M 4.1 in Baffin Island, Canada occurred near the peak of the geomagnetic storm and was likely promoted by energy associated with that event. It is the strongest earthquake in the Baffin Bay area since the geomagnetic storm in late October, 2019 when an M 4.6 occurred near the same time of day on October 22. Forecast 123422 had expected this event was likely within about 100 km of this epicenter around April 19. This earthquake was not reported felt in this remote epicentral area.

 

O: 21APR2020 00:35:05  72.2N   75.1W MB=4.1  ECAN of Pond Inlet, NU  

O: 19APR2020 21:03:20  71.1N   72.8W MB=2.6  ECAN Clyde River, NU   

O: 19APR2020 20:21:08  71.0N   71.8W MB=3.0  ECAN Clyde River, NU   

O: 21APR2020 00:35:05  72.2N   75.1W ML=4.1  EMSC   BAFFIN ISLAND REGION, CANADA 

P: 19APR2020 123422    71.0N   75.0W 2.5-3.9 AAAAA  Baffin/Davis Strait Canada 

 

The M 2.6 in Alberta, Canada is also the largest within about 250 km of that epicenter since at least October, 2019 - an M 2.0 hit near today's epicenter on  October 10. Today's event hit at the height of the geomagnetic storm and was probably promoted by it. Forecasts 123385 and 123387 had expected regional activity in Alberta around April 19.

 

NEIC reported this earthquake of M 2.6 in Alberta, Canada was felt with intensity II-III in the area(s) of Alberta, Canada at Lethbridge.

 

O: 20APR2020 19:30:45  49.1N  112.8W Ml=2.6  EMSC   ALBERTA, CANADA              

P: 19APR2020 123385    46.4N  111.4W 2.0-4.0 ACAAA  Yellowstone/Wyoming        

P: 19APR2020 123387    52.0N  115.0W 2.0-4.3 ACBAA  Alberta                    

 

The M 4.6 in the Fox Islands, Aleutians, Alaska was the strongest in the U.S. or Canada today. The last shallow focus earthquake within about 150 km of this epicenter in the Fox Islands with equal or greater magnitude occurred, like the event in Baffin Bay, in association with the strong geomagnetic storm of October,  2019 - on October 26, 2019. Today's event may be an aftershock of that. Forecast 123393 had expected today's event in this region in the Fox Islands was likely around April 19.

 

O: 20APR2020 23:16:21  52.9N  169.6W mb=4.6  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 19APR2020 123393    51.9N  169.2W 3.5-5.2 AAAAA  Fox Islands, Aleutians     

 

The earthquakes of M 4.0 and 4.1 in northern Alaska also occurred at the height of the geomagnetic storm today. The last event of M>=4.1 in this aftershock zone was an M 4.1 on January 3, 2020 and an M 4.0 on March 24, 2020. The only event of  larger magnitude in this aftershock zone in the past six months was an M 4.5 on December 16, 2019. Forecast 123415 had expected today's event within about 100 km was likely around April 16.

 

O: 20APR2020 21:02:15  69.4N  143.9W mb=4.0  EMSC   NORTHERN ALASKA              

O: 20APR2020 15:13:42  69.6N  144.1W mb=4.1  EMSC   NORTHERN ALASKA              

P: 16APR2020 123415    69.0N  142.0W 3.0-5.0 BAAAA  Northern Alaska            

 

An M 2.5 in the San Francisco Bay area of California was also widely felt today and may have been related to either/or the geomagnetic storm and new moon effects. It occurred near the height of the geomagnetic storm and near local solar noon in California. The only event of M>=2.5 in the San Francisco Bay area of California during 2020 was an M 2.9 on March 6, 2020. An M 2.5 also hit on January 3, 2020. A moderate earthquake of M 4.5 hit within about 20 km of this epicenter on October 15, 2019. This may be an aftershock of that event. Forecast 123299 had expected today's event within about 10 km was likely around April 18.

 

NEIC reported this earthquake of M 2.5 in San Francisco, California  was felt with intensity II-III in the area(s) of San Francisco, California at Danville, Alamo, Danville, Walnut Creek, San Ramon, Walnut Creek, Concord.

 

O: 20APR2020 18:12:08  37.8N  122.0W Md=2.5  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 18APR2020 123299    37.9N  122.0W 2.5-4.8 AAAAA  Central California         

 

The strongest earthquake in the western U.S. outside Alaska were aftershocks of M 4.0-4.1 in the region of Southern Idaho and in the Mammoth Lakes, California aftershock zones. They were reported lightly felt in these areas. Forecasts 123294 and 123361 had expected this activity in mid-April within about 20 km of these epicenters.

 

NEIC reported the earthquake of M 4.0 in California-Nevada border  was felt with intensity II-III in the area(s) of California-Nevada border at Lee Vining, June Lake, Mammoth Lakes, Park, West Point and Clovis.

 

O: 21APR2020 05:13:31  38.0N  118.8W Mw=4.0  EMSC   CENTRAL CALIFORNIA

P: 18APR2020 123294    38.0N  118.8W 2.5-4.6 BAAAA  California/Nevada area     

 

NEIC reported the earthquake of M 4.1 in Southern Idaho  was felt with intensity II-III in the area(s) of Southern Idaho at Lowman and Cascade (IV) and McCall, Garden Valley, Donnelly, Ellis, Garden City, Boise and May.

 

O: 21APR2020 05:58:01  44.4N  115.2W mb=4.1  EMSC   SOUTHERN IDAHO

P: 12APR2020 123361    44.5N  115.1W 2.0-3.9 CAAAA  Montana/Idaho              

 

The strongest earthquake in the world today was an M 5.2 in the Solomon Islands of the Southwestern Pacific. It was not reported felt in this area. The last earthquake of equal or larger magnitude within about 200 km of this epicenter was an M 5.5 on January 2, 2020 and prior to that an M 5.4 on December 16, 2019. Forecast 123004 had expected today's activity in mid-April.

 

O: 20APR2020 19:59:22   8.5S  159.2E Mw=5.2  EMSC   SOLOMON ISLANDS              

P:  9APR2020 123004     9.0S  157.0E 4.0-5.4 CABAA  Solomon Islands            

 

STRONG EARTHQUAKE RATTLES EASTERN HONSHU, JAPAN

 

EARTHQUAKE SUMMARY FOR APRIL 19, 2020

 

A strong M 6.3-6.4 earthquake occurred today off the coast of eastern Honshu, Japan. NEIC reported it was felt with maximum intensity V in Japan in Iwate, IV in Miyagi, and II-III in Tokyo, Akita, Aomori, Chiba, Ibaraki and Fukushima.

No major damage was reported. It is located about 40 km south of the M 9.0+ quake of March 11, 2011 suggesting that not all the available seismic energy was used up in that event. The area has been relatively quiet since 2012. The last event within about 100 km of today's epicenter with M>=6.3 was an M 6.3 on June 17, 2012. Larger earthquakes since then have tended to occur about 100-200 km from today's epicenter to the north or south. The strongest of these was an M 6.9 on November 21, 2016 about 200 km southwest of today's epicenter. This epicenter is at 142 East longitude and is likely to have been promoted by tidal stresses associated with the coming new moon and the past full moon as noted in this summary in previous issues as:

 

“The occurrence of this strong earthquake today at 140 East longitude on the Pacific Rim is consistent with promotion by tidal stresses associated with the full moon. The forecast for such seismicity was presented in this summary in mid-April as:

 

"The full moon will arrive at 02:35 UT on April 8. This is the last of a series of three super-moons. It is likely that global seismicity will be low to moderate during the next five days increasing after that. Areas at local solar midnight with this Full moon are near 40 West while those at local noon are near 140 East longitude. These may see some increased seismicity during this time and include much of the western Pacific rim." (April 6-7, 2020)

 

As it happens the new moon occurs on April 23 within 10 minutes of the same time as the Full Moon of April 8 and the same longitude will see significant tidal triggering at this time as with the full moon. The forecast for upcoming tidal triggering in this summary reads:

 

"The new moon will arrive at 02:26 UT on April 23, 2020. Longitudes which are sub-lunar at this time are near 40 West and those sub-solar at 140 East longitude. These include the Bonin Islands north to Honshu and the Kurils and south to eastern Indonesia in the east and the central Atlantic in the west. These areas could see significant tidal triggering in the next week." (April 17 18, 2020)  (April 17-19, 2020)

 

The M 6.6 south of this in the Bonin Islands on April 18 probably also have helped trigger today's earthquake to the north off Honshu, Japan.

 

Forecast 123334 had expected today's event was likely about 75 km to the east around April 16. This epicenter is at the fifth node (72 degrees) from the M 6.5 in Southern Idaho of March 31 and may have been promoted by energy from that source.

 

O: 20APR2020 01:49:36  38.8N  142.1E mb=4.5  EMSC   NEAR EAST COAST OF HONSHU, JAP

O: 19APR2020 20:39:05  39.0N  142.0E Mw=6.4  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 16APR2020 123334    39.0N  143.0E 4.0-5.4 BAAAA  So. of Honshu              

 

An M 4.7 also occurred in the area of Iceland today. It was felt lightly in the epicentral region. The only other event of equal or larger magnitude in this epicentral area in the past six months was an M 4.8 on January 5, 2020. Forecast 123411 had expected today's event was likely in mid-April. This epicenter is located at the sixth node (60 degrees) from the M 7.7 of January near Cuba and may have been promoted by energy from that source.

 

O: 20APR2020 03:54:52  64.7N   17.2W mb=4.7  EMSC   ICELAND                      

P: 15APR2020 123411    63.0N   17.0W 3.0-4.7 BBAAA  Iceland area               

 

The largest events near the U.S. or Canada today were an M 3.4 and 3.7 in Baja California, Mexico. The last earthquake of M>=3.7 within about 100 km of these epicenter was an M 4.0 on January 12, 2020 and prior to that an M 3.9 on December 11, 2019. Forecast 123325 had expected today's events to the north in mid-April.

 

O: 19APR2020 16:48:18  31.4N  115.6W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO      

O: 19APR2020 09:36:25  31.5N  115.6W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO      

P: 15APR2020 123325    32.8N  116.0W 2.5-4.6 BBAAA  So. California             

 

MODERATE AND STRONG ACTIVITY CONTINUES IN JAPAN

 

EARTHQUAKE SUMMARY FOR APRIL 18, 2020

 

An M 5.7 aftershock in the Bonin Islands, Japan today was the strongest earthquake since the last issue of this summary. This follows an M 6.6 that occurred about an hour earlier and was reported in this summary as:

 

 

"A strong M 6.6 earthquake shook the Bonin Islands of Japan today at a deep focus (490 km). It was reported felt in southern Honshu more than 1000 km from the epicenter with intensity II-III in Japan at Chiba, Kanagawa, Tokyo, and Saitama. JMA reported it was felt in Tokyo and Ogasawara, Japan with intensity IV. No tsunami was expected or observed from this deep focus event. This is the strongest earthquake in the Bonin Islands since an M 7.8 on May 30, 2015  at a deep focus.

 

The occurrence of this strong earthquake today at 140 East longitude on the Pacific Rim is consistent with promotion by tidal stresses associated with the full moon. The forecast for such seismicity was presented in this summary in mid-April as:

 

"The full moon will arrive at 02:35 UT on April 8. This is the last of a series of three super-moons. It is likely that global seismicity will be low to moderate during the next five days increasing after that. Areas at local solar midnight with this Full moon are near 40 West while those at local noon are near 140 East longitude. These may see some increased seismicity during this time and include much of the western Pacific rim." (April 6-7, 2020)

 

As it happens the new moon occurs on April 23 within 10 minutes of the same time as the Full Moon of April 8 and the same longitude will see significant tidal triggering at this time as with the full moon. The forecast for upcoming tidal triggering in this summary reads:

 

"The new moon will arrive at 02:26 UT on April 23, 2020. Longitudes which are sub-lunar at this time are near 40 West and those sub-solar at 140 East longitude. These include the Bonin Islands north to Honshu and the Kurils and south to eastern Indonesia in the east and the central Atlantic in the west. These areas could see significant tidal triggering in the next week." (April 17-18, 2020)

 

It had been re-emphasied in previous issues of this summary:

 

"Further moderate to large seismicity in the region of Central and South America is likely as the new moon approaches. In the absence of other important triggers to seismicity such as geomagnetic storms, major earthquakes and tropical cyclones, the tidal factors tend to dominate earthquake triggering and these are strongest near the full moon (around April 23)." (April 15-26, 2020)

 

Forecast 123273 had expected a moderate to strong quake in the Bonin Islands about 150 km northeast of this epicenter was likely in mid-April. This epicenter is at 120.0 degrees (node 3 from the M 7.7 in Cuba of January 28 and may have been promoted by energy from that source. An M 4.7-5.0 in South Island, New Zealand today was also at this distance from the Cuba event." (April 17-18, 2020)

 

O: 18APR2020 08:25:37  27.1N  140.1E Mw=6.6  EMSC   BONIN ISLANDS, JAPAN REGION  

O: 18APR2020 09:24:18  27.2N  140.0E Mw=5.7  EMSC   BONIN ISLANDS, JAPAN REGION  

P: 13APR2020 123273    28.0N  142.0E 4.0-5.4 BABAA  Bonin Islands              

P: 20APR2020 123273    29.0N  143.0E 4.0-5.6 ABBAA  Bonin Islands               

 

The strongest earthquakes in the U.S. or Canada today were an M 3.8 in Central Alaska and an M 3.9 in the Alaska Peninsula. The last earthquake in Central Alaska of  equal or larger magnitude than today's was an M 3.9 on April 2 and prior to that an M 3.9 on March 6, 2020. Forecast 123410 had expected today's event was likely in mid-April.

 

NEIC reported this earthquake of M 3.6 in Central Alaska  was felt with intensity II-III in the area(s) of Central Alaska at Talkeetna and Wasilla.

 

O: 19APR2020 03:06:31  63.1N  150.3W mb=3.8  EMSC   CENTRAL ALASKA               

P: 15APR2020 123410    63.2N  151.4W 3.2-5.1 BAAAA  Central Alaska             

 

The last earthquake of M>=3.9 in the Alaska Peninsula within about 200 km of today's epicenter occurred February 6, 2020. Forecast 123402 had expected this activity in mid-April.

 

O: 18APR2020 17:02:30  55.9N  161.0W mb=3.9  EMSC   ALASKA PENINSULA             

P: 17APR2020 123402    54.5N  163.5W 3.5-5.0 ABBAA  Unimak Islands, Aleutians  

 

An M 4.3 off northern Puerto Rico was also felt today. It was followed by a series of light aftershocks but is not an aftershock of the event in southern Puerto Rico. The last earthquake within about 100 km of this epicenter near the Puerto Rico Trench with larger magnitude was an M 4.5 on February 2, 2020 and an  M 4.5 on January 29, 2020. Forecast 123265 had expected regional activity was likely around April 18. When the event occurred on January 29 this summary noted in regard to regional seismicity:

 

 

"An earthquake midway between Northern Puerto Rico and the Dominican Republic of M 4.5 also occurred today. NEIC reported intensity II-III for this event in Puerto Rico at Aguadilla, Penuelas, Bayamon, and in the Dominican Republic at Otra Banda, El Carni, Moca Espaillat, and El Llano and in Toad Town, British Virgin Islands. This is an unusual epicenter. The last event within about 50 km of this epicenter occurred as an M 6.0  on September 27, 2019, the first in the current active period in Puerto Rico. Forecast 121458 had expected today's event to the southeast around January 29. This is getting close to the Puerto Rico Trench where a major subduction type earthquake is possible. When the M 6.0 occurred on September 24, 2019 this summary noted:

 

"NEIC reported the mainshock was felt with maximum intensity V in Puerto Rico at San Antoniom Quebradillas, IV in Aguadilla, Isabela, Aguada, Rincon, Camuy, and Anasco and within about 200 km of the epicenter in the Puerto Rico trench.

A series of moderate aftershocks including an M 5.0 and 4.4 were felt in a similar area. An aftershock of M 4.3 was felt in Puerto Rico with maximum intensity V in Camuy and Hatillo; IV in Isabela, Quebradillas, Aguada, Rincon and Mayaguez and II-III in Aguadilla, Moca and San Sebastian among others.

The aftershocks suggest that the activity is not over and that the M 6.0 may not have used up the available seismic energy in the trench. It has been nearly 75 years since a strong tsunami hit in this area but such an event remains a possibility. Built structures could be vulnerable to a strong tsunami such as that in 1946. Thanks in large part to international and governmental efforts, the potential for a large tsunami in the area has been recognized and preparations for such an event have been made." (September 24, 2019, January 29, 2020)

 

 

O: 19APR2020 04:59:15  19.1N   67.1W ML=3.2  EMSC   PUERTO RICO REGION

O: 19APR2020 03:55:15  19.1N   67.1W ML=3.3  EMSC   PUERTO RICO REGION

O: 19APR2020 03:52:08  19.1N   67.1W mb=4.3  EMSC   PUERTO RICO REGION

O: 19APR2020 06:20:42  19.2N   67.2W Md=3.3  EMSC   PUERTO RICO REGION

P: 18APR2020 123265    18.0N   67.0W 3.4-5.1 AAAAA  Puerto Rico  

 

STRONG EARTHQUAKE SHAKES BONIN ISLANDS, JAPAN

 

EARTHQUAKE SUMMARY FOR APRIL 17, 2020

 

A strong M 6.6 earthquake shook the Bonin Islands of Japan today at a deep focus (490 km). It was reported felt in southern Honshu more than 1000 km from the epicenter with intensity II-III in Japan at Chiba, Kanagawa, Tokyo, and Saitama.

JMA reported it was felt in Tokyo and Ogasawara, Japan with intensity IV. No tsunami was expected or observed from this deep focus event. This is the strongest earthquake in the Bonin Islands since an M 7.8 on May 30, 2015

at a deep focus.

 

The occurrence of this strong earthquake today at 140 East longitude on the Pacific Rim is consistent with promotion by tidal stresses associated with the full moon. The forecast for such seismicity was presented in this summary in mid-April as:

 

"The full moon will arrive at 02:35 UT on April 8. This is the last of a series of three super-moons. It is likely that global seismicity will be low to moderate during the next five days increasing after that. Areas at local solar midnight with this Full moon are near 40 West while those at local noon are near 140 East longitude. These may see some increased seismicity during this time and include much of the western Pacific rim." (April 6-7, 2020)

 

As it happens the new moon occurs on April 23 within 10 minutes of the same time as the Full Moon of April 8 and the same longitude will see significant tidal triggering at this time as with the full moon. The forecast for upcoming tidal triggering in this summary reads:

 

"The new moon will arrive at 02:26 UT on April 23, 2020. Longitudes which are sub-lunar at this time are near 40 West and those sub-solar at 140 East longitude. These include the Bonin Islands north to Honshu and the Kurils and south to eastern Indonesia in the east and the central Atlantic in the west. These areas could see significant tidal triggering in the next week." (April 17-18, 2020)

 

It had been re-emphasied in previous issues of this summary:

 

"Further moderate to large seismicity in the region of Central and South America is likely as the new moon approaches. In the absence of other important triggers to seismicity such as geomagnetic storms, major earthquakes and tropical cyclones, the tidal factors tend to dominate earthquake triggering and these are strongest near the full moon (around April 23)." (April 15-26, 2020)

 

Forecast 123273 had expected a moderate to strong quake in the Bonin Islands about 150 km northeast of this epicenter was likely in mid-April. This epicenter is at 120.0 degrees (node 3 from the M 7.7 in Cuba of January 28 and may have been promoted by energy from that source. An M 4.7-5.0 in South Island, New Zealand today was also at this distance from the Cuba event.

 

O: 18APR2020 08:25:38  27.1N  140.1E Mw=6.7  EMSC   BONIN ISLANDS, JAPAN REGION

P: 13APR2020 123273    28.0N  142.0E 4.0-5.4 BBBAA  Bonin Islands              

 

The strongest earthquake in North America outside Mexico today was an M 4.5 in  Eastern Greenland. It was not reported felt in the area. This event west of Iceland is the strongest in Eastern Greenland within about 250 km of this epicenter since an M 4.5 on September 27, 1993 and an M 4.8 on January 13, 1991. This earthquake occurred within minutes of local solar noon at 38 West longitude. This is consistent with it being promoted by tidal stresses from the full and new moon in this lunar cycle.

 

O: 17APR2020 14:56:54  65.9N   37.7W mb=4.5  EMSC   EASTERN GREENLAND            

 

The earthquake in Greenland may also have been triggered by an M 4.5-5.6 in  the Reykjanes Ridge about 2.5 hours earlier. This activity is part of an activation in this area which began yesterday with two events of M 4.5 each. This is also consistent with triggering by tidal stresses. The last earthquake of M>=5.6 in the Southern Reykjanes ridge was recorded on February 13, 2015 with M 7.1.

Forecast 123396 had expected this activity was likely around April 13. The activity in the North Atlantic is at the seventh node (51-52 degrees) from the M 6.5 in southern Idaho of March 31 and may have been promoted from energy from that source.

 

O: 17APR2020 12:28:52  52.8N   34.4W mb=4.5  EMSC   REYKJANES RIDGE              

O: 17APR2020 12:05:08  52.9N   34.7W MB=5.6  ECAN North Atlantic Ocean     

P: 13APR2020 123396    53.0N   32.0W 4.0-5.6 BABAA  North Mid-Atlantic Ridge   

 

Aftershocks continued in Idaho, Utah, Southern California and Central California today but with lesser magnitude than those of the previous two days. The strongest of these was an M 3.2 in the Mammoth Lakes area with intensity II in Lee Vining, California and Carson City, Nevada. Forecast 123294 had expected further aftershocks in this area around April 18.

 

O: 17APR2020 10:13:39  38.0N  118.8W ML=3.1  EMSC   CENTRAL CALIFORNIA

O: 17APR2020 06:52:49  38.0N  118.7W ML=3.1  EMSC   CENTRAL CALIFORNIA           

O: 17APR2020 06:52:49  38.0N  118.7W ML=3.2  ANSS   CENTRAL CALIFORNIA           

P: 18APR2020 123294    38.0N  118.8W 2.5-4.6 AAAAA  California/Nevada area     

 

A light earthquake also occurred off the coast of Central California today with M 2.4. This is the largest earthquake off Central California west of 121.7W and between 36-37 N since an M 2.4 on June 14, 2019 and the largest within about 50 km in this area since an M 2.8 on January 13, 2017. Offshore earthquakes in this area can be like outer rise earthquakes, indicating a region of built up strain and the possibility of a regional moderate coming quake downslope. Forecast 123298 had expected this event was likely around April 20 within about 25 km.

 

O: 18APR2020 00:38:56  36.4N  121.9W Md=2.4  EMSC   OFFSHORE CENTRAL CALIFORNIA  

P: 20APR2020 123298    36.3N  121.6W 2.5-4.5 AAAAA  Central California         

 

An earthquake of M 5.7 also hit in the Mid-Indian Ridge in the Indian Ocean today. This event is at 103 degrees from the M 7.7 of March 25, 2020 in the Kuril Islands and was probably promoted by energy from that source. The area has been active since the Kuril quake. This is located at the antipode of the Gulf of California where a moderate quake hit yesterday and could help enhance seismicity in that region in coming days near 24N 110W.

 

O: 17APR2020 16:30:48  23.7S   69.4E Mw=5.7  EMSC   MID-INDIAN RIDGE

O: 18APR2020 07:34:46  23.7S   69.5E mb=4.8  EMSC   MID-INDIAN RIDGE

 

 

 

STRONG EARTHQUAKES IN MYANMAR AND HONDURAS

 

EARTHQUAKE SUMMARY FOR APRIL 16, 2020

 

The strongest earthquake in the world today was an M 5.9-6.0 in Myanmar. NEIC reported it was felt with intensity VI in Komilla, Bangladesh; V in Falam Chin, Myanmar and IV in Chattagam, Bangladesh with lesser shaking in Myanmar at Monywa, Mandalay, Mogok, and Tungi Gazipur and Coxs Bazar, Bangladesh. This is the strongest earthquake in Myanmar within about 250 km of this epicenter since an M 6.8 about 250 km to the south on August 24, 2016 and an M 6.9 north of today's epicenter on April 13, 2016. Forecast 123280 had expected today's event within about 100 km was likely around April 12.

 

O: 16APR2020 11:45:24  22.8N   94.1E Mw=5.9  EMSC   MYANMAR                      

P: 12APR2020 123280    24.0N   94.0E 4.0-5.7 BBAAA  Myanmar                    

 

A strong M 6.0 was also felt in the region north of Honduras today. NEIC reported maximum shaking V at Savannah Bight, Jose Santos, Monte Placentero; IV in Roatan Islas, Sandy Bay, Trujilo Colon, Nueva Armenia, Jutiapa, Utila Islas and Corozal, Honduras. This is the strongest earthquake within about 200 km of this epicenter north of Honduras since an M 7.3 on May 28, 2009. An M 7.6 also hit slightly outside this zone in Honduras on January 10, 2018 and like the event in northern Colombia two days ago at 104 degrees from the M 6.8 in eastern Turkey of January 24.  It is part of an activation of Central America which began in northern Colombia two days ago as noted in this summary:

 

"Further moderate to large seisicity in the region of Central and South America is likely as the new moon approaches. In the absence of other important triggers to seismicity such as geomagnetic storms, major earthquakes and tropical cyclones, the tidal factors tend to dominate earthquake triggering and these are strongest near the full moon (around April 23)." (April 15-26, 2020)

 

Forecast 123260 had expected today's event within about 25 km of the epicenter was likely around April 19. This epicenter is at 101 degrees from the Kuril Islands quake and at 104 degrees from the Eastern Turkey quake of January 24 and may have been promoted by energy from those sources.

 

O: 16APR2020 08:04:37  17.0N   85.7W Mw=6.0  EMSC   NORTH OF HONDURAS            

P: 19APR2020 123260    17.0N   86.0W 3.5-5.6 BAAAA  Nicaragua                  

 

An M 4.5 was felt within about 100 km in northern Italy today. NEIC reported maximum shaking of VI in Gorreto, Ligurien, Italy with II-III in Italy at Piacenza, Bargagli, Bressana, Voghera, Camogli, Genoa, and Lombardo. Previous earthquake of M>=4.5 within about 200 km of today's epicenter occurred as an M 4.8 on December 9, 2019 about 200 km southeast of this epicenter and an M 4.9 on November 19, 2017 about 50 km to the east. Forecast 123347 had expected today's event within about 50 km of the epicenter was likely around April 17.

 

O: 16APR2020 11:16:45  44.7N    9.4E ML=3.5  EMSC   NORTHERN ITALY               

O: 16APR2020 09:42:52  44.7N    9.4E ML=4.2  EMSC   NORTHERN ITALY                

O: 16APR2020 09:42:53  44.7N    9.4E ML=4.5  ANSS   NORTHERN ITALY               

P: 17APR2020 123347    45.0N   10.0E 3.0-5.1 AAAAA  Austria                    

 

Elevated seismicity also continued today in the South Sandwich Islands. This area has been active since the March 25 M 7.7 in the Kuril Islands near the antipode and saw an M 5.4 yesterday. Today's activity is about 200 km south of the recent events in the area and was not reported felt. It is the strongest in this area since an M 5.2 on February 17.  Forecasts 123469 and 123470 had expected today's activity was likely around April 16-18.

 

O: 16APR2020 12:58:11  60.3S   26.2W mb=4.7  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 16APR2020 08:15:23  60.3S   27.3W mb=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 16APR2020 123470    61.0S   26.0W 4.0-5.6 AAAAA  Southern  Ocean            

P: 18APR2020 123469    60.0S   26.0W 4.0-6.0 AAAAA  So. Sandwich Islands       

 

The largest earthquake in the U.S. or Canada was an M 5.3 in the Kodiak Island area of Alaska. NEIC reported it was felt with intensity II-III in Ninilchik, Anchorage and Wasila, Alaska. It was followed by a series of light aftershocks and is the strongest in the Kodiak Island area in the past six months. This is the strongest earthquake in the area within about 200 km of this epicenter since an M 5.9 on May 16, 2009 more than 10 years ago. Forecast 123386 had expected activity in this area was likely around April 19.

 

O: 17APR2020 01:10:36  55.9N  153.3W ML=3.2  EMSC   SOUTH OF ALASKA              

O: 17APR2020 02:37:21  55.9N  153.3W ML=3.5  EMSC   SOUTH OF ALASKA              

O: 16APR2020 10:30:47  56.0N  153.4W ml=3.8  EMSC   KODIAK ISLAND REGION, ALASKA 

O: 17APR2020 00:22:44  56.2N  153.6W Mw=5.2  EMSC   KODIAK ISLAND REGION, ALASKA 

O: 17APR2020 00:22:46  56.0N  153.4W Mw=5.3  ANSS   KODIAK ISLAND REGION, ALASKA 

P: 19APR2020 123386    54.7N  156.9W 3.5-5.1 ABBAA  Alaska Peninsula           

 

The strongest aftershocks in the Mammoth Lakes area of Central California today were of M 4.0 and  M 3.7. NEIC reported they were felt with intensity II-III in California at June Lake, Mammoth Lakes, Lee Vining, El Portal, Groveland, and Yosemite National Park and in Glenbrook, Nevada. This is the strongest aftershock in this area since the mainshock of April 11, 2020 of M 5.2 and  the immediate aftershocks on that date and the first other than that since an M 4.0 on August 12, 2017. Forecast 123294 had expected today's activity was likely within about 10 km around April 18.

 

O: 16APR2020 13:49:06  38.1N  118.8W ML=3.9  EMSC   CENTRAL CALIFORNIA

O: 16APR2020 13:49:06  38.1N  118.8W ML=4.0  ANSS   CENTRAL CALIFORNIA

P: 18APR2020 123294    38.0N  118.8W 2.5-4.6 AAAAA  California/Nevada area     

 

An M 4.2 was also widely felt in the Salt Lake City area of Utah. It is an aftershock of the M 5.6 which hit the area in late March, 2020. NEIC reported this earthquake of M 4.2 was felt with intensity IV in Salt Lake City, Magna, and in general within about 100 km of the epicenter.  Along with a similar event of M 4.2 in the Utah aftershock zone yesterday, these are the strongest aftershocks since the mainshock of March 18, 2020. Forecast 123342 had expected today's activity was likely around April 13.

 

O: 17APR2020 02:59:23  40.7N  112.1W ML=2.0  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 16APR2020 13:41:29  40.7N  112.1W mb=4.0  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 16APR2020 13:41:29  40.7N  112.1W mb=4.2  ANSS   WASATCH FRONT URBAN AREA, UTAH

P: 13APR2020 123342    40.4N  112.0W 2.0-3.9 BAAAA  Utah area                  

 

A moderate aftershock of M 4.1 was also recorded today in the region of Southern Idaho. It was accompanied by a continuing series of lighter events.  They were reported felt in the Stanley area of Southern Idaho. Forecast 123361 had expected this activity in mid-April.

 

O: 16APR2020 06:43:39  44.3N  115.2W Ml=4.1  EMSC   SOUTHERN IDAHO

P: 12APR2020 123361    44.5N  115.1W 2.0-3.9 BAAAA  Montana/Idaho              

 

MODERATELY STRONG QUAKE SHAKES NORTHERN COLOMBIA

 

EARTHQUAKE SUMMARY FOR APRIL 15, 2020

 

The strongest earthquake in the world today was an M 5.7 in northern Colombia. NEIC reported it was felt with intensity VII in Colombia in Pinillos, Bolivar; V in Sincelejo, Sucre and IV in Valledupar and Bucaramanga and II-III in Sant Marta, Barranquilla, Corozal, Aguachica, San Antero, and Cartagena. This is a rare event, the first within about 200 km of this epicenter of M>=5.7 in at least 30 years. Most regional activity occurs to the southwest of this epicenter. For example, an M 6.0 occurred about 300 km southwest of this on September 14, 2016, the largest recent such event within about 300 km. This epicenter is nearly antipodal to an active area South of Sumatra and may promote further activity in that region. An earthquake of M 5.5 occurred in this region of Sumatra on March 10, 2020. Forecast 123209 had expected this event in Colombia to the southeast was likely around April 13. Forecast 123209 had expected today's event about 200 km to the southeast of this epicenter was likely in Colombia around April 13. Today's earthquake is at 103 degrees from the M 6.8 in Turkey of January 24 and was probably promoted by energy from that source. Further moderate to large seismicity in the region of Central and South America is likely as the new moon approaches. Moderate earthquakes in Costa Rica and Chiapas, Mexico today suggest this may already be happening. In the absence of other important triggers to seismicity such as geomagnetic storms, major earthquakes and tropical cyclones, the tidal factors tend to dominate earthquake triggering and these are strongest near the full moon (around April 23).

 

O: 15APR2020 10:59:27   8.9N   74.4W Mw=5.7  EMSC   NORTHERN COLOMBIA             

P: 13APR2020 123209     7.0N   73.0W 4.0-5.6 ABBAA  Colombia                   

 

An unusual M 4.9 off the northeastern coast of Queensland, Australia occurred today. NEIC reported intensity II-III in Queensland at Bowen, Ayr, Mackay, Townsville, Moranbah and Brisbane. This is the strongest earthquake within about 300 km of this epicenter since an M 5.7 on August 18, 2016. The only other such event in the area in the past 30 years was an M 5.0 on April 16, 2011.

 

O: 15APR2020 07:11:04  19.9S  148.8E mb=4.9  EMSC   QUEENSLAND, AUSTRALIA        

 

Moderately large earthquakes also continued today in the near-antipodal areas of the South Sandwich Islands (M 5.4) and in Kamchatka, Russia (M 5.1 +..). These may have been promoted by the M 7.7 of March 25 in the Kuril Islands. Forecasts 122294, 123363 and 123469 had expected this activity in mid-April.

 

O: 16APR2020 05:12:40  58.0S   25.8W Mw=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 14APR2020 123469    58.0S   26.0W 4.0-5.6 AAAAA  So. Sandwich Islands       

 

O: 15APR2020 18:40:34  52.1N  160.4E mb=4.2  EMSC   OFF EAST COAST OF KAMCHATKA

O: 15APR2020 18:43:39  52.2N  160.4E mb=5.1  EMSC   OFF EAST COAST OF KAMCHATKA

O: 15APR2020 10:29:10  51.9N  161.5E mb=4.7  EMSC   OFF EAST COAST OF KAMCHATKA  

P: 15APR2020 123394    55.0N  163.0E 4.0-5.8 ACBAA  Komandorsky Isl            

P: 16APR2020 123363    49.0N  158.0E 3.5-5.6 ACBAA  NE Pacific                 

 

An M 3.9 aftershock also shook the region of the California-Nevada border near Mammoth Lakes. It was reported felt with intensity III in Lee Vining, California The area had not seen significant aftershocks for several days but apparently is not quiet yet. Forecast 123293 had expected around April 17.

 

O: 15APR2020 20:13:05  38.1N  118.8W Mw=3.9  EMSC   CENTRAL CALIFORNIA

P: 17APR2020 123293    37.5N  118.6W 2.5-4.7 AAAAA  California/Nevada area     

 

An earthquake of M 2.6-2.8 also occurred east of Los Angeles today. This area has been quiet for several months. This is the strongest earthquake within about  50 km of this epicenter since an M 2.9 on November 25, 2019, nearly five months ago. Forecast 123329 had expected activity in this area was likely around April 15.

 

NEIC reported this earthquake of M 2.8 in Southern California  was felt with intensity II-III in the area(s) of Southern California at Big Bear City, Big Bear Lake.

 

Today's earthquake in Southern California, like that in Colombia, is at 103 degrees from the M 6.8 in Turkey of January 24 and was probably promoted by energy from that source.

 

O: 16APR2020 02:37:26  34.3N  116.8W ML=2.6  EMSC   SOUTHERN CALIFORNIA          

O: 16APR2020 02:37:26  34.3N  116.8W ML=2.8  ANSS   SOUTHERN CALIFORNIA          

P: 15APR2020 123329    34.4N  116.5W 2.5-4.4 AAAAA  So. California             

 

An M 3.9 also occurred today in the area of Southern Idaho. It was felt at Stanley and Lowman, Garden City, Boise, and Eagle.  Following is a list of events of M>=3 in this aftershock zone today. A more extensive list is found in the regional section below. Forecast 123361 had expected regional activity to continue in mid-April.

 

O: 15APR2020 23:35:43  44.3N  115.0W ML=3.3  EMSC   SOUTHERN IDAHO

O: 16APR2020 06:43:39  44.3N  115.2W ML=3.9  EMSC   SOUTHERN IDAHO

O: 15APR2020 20:54:07  44.4N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 15APR2020 13:36:36  44.4N  115.2W ML=3.1  EMSC   SOUTHERN IDAHO

O: 15APR2020 12:02:46  44.2N  115.1W Ml=3.0  EMSC   SOUTHERN IDAHO               

P: 12APR2020 123361    44.5N  115.1W 2.0-3.9 BAAAA  Montana/Idaho              

 

AFTERSHOCKS CONTINUE IN WESTERN U.S.

 

EARTHQUAKE SUMMARY FOR APRIL 14, 2020

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Salt Lake City, Utah aftershock zone. NEIC reported it was felt with intensity IV in Salt Lake City, Magna, West Jordan, and Bingham, Utah with intensity III in Sandy, Bountiful, Woods Cross, Herriman and Riverton among others within about 50 km of the epicenter. This is the largest aftershock in the aftershock zone of the M 5.7 Salt Lake City quake of March 18, 2020 since immediate shocks of M 4.6 on March 18. Forecast 123342 had expected enhanced seismicity in this aftershock zone of Utah around April 13.

 

O: 15APR2020 02:56:09  40.7N  112.1W Mw=4.0  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 15APR2020 02:56:09  40.7N  112.1W Mw=4.2  ANSS   WASATCH FRONT URBAN AREA, UTAH

P: 13APR2020 123342    40.4N  112.0W 2.0-3.9 AAAAA  Utah area                  

 

Aftershocks also continued in southern Idaho aftershocks zone today. The largest of these was an M 4.0 followed later in the day by an M 3.7. These events were reported felt with intensity II in Stanley, Idaho. Forecast 123361 had expected this activity was likely in mid-April.

 

O: 14APR2020 16:01:02  44.1N  115.1W Ml=3.7  EMSC   SOUTHERN IDAHO

O: 14APR2020 07:44:08  44.3N  115.0W Ml=4.0  EMSC   SOUTHERN IDAHO

O: 14APR2020 08:08:23  44.3N  115.2W Ml=3.0  EMSC   SOUTHERN IDAHO

O: 15APR2020 04:38:59  44.4N  115.2W ML=3.2  EMSC   SOUTHERN IDAHO

P: 12APR2020 123361    44.5N  115.1W 2.0-3.9 AAAAA  Montana/Idaho               

 

Light aftershocks also continued in the Mammoth Lakes area of Central California. The strongest of today's events were three of M 2.7 each. They were not reported felt in the aftershock zone. Forecast 123293 had expected this activity was likely around April 14.

 

O: 14APR2020 20:11:02  38.0N  118.8W ML=2.7  EMSC   CENTRAL CALIFORNIA

O: 14APR2020 20:28:07  38.0N  118.8W ML=2.7  EMSC   CENTRAL CALIFORNIA

O: 15APR2020 03:07:03  38.1N  118.8W ml=2.7  EMSC   CENTRAL CALIFORNIA

P: 14APR2020 123293    37.9N  118.2W 2.5-4.8 AAAAA  California/Nevada area     

 

 

An M 4.2 was also reported in Alaska near Chignik in the Alaska Peninsula where it was felt with intensity III. The last earthquake of equal or larger magnitude in the Alaska Peninsula within about 200 km of this epicenter was an M 4.9 on November 7, 2019. The last events of M>=4.2 in this area occurred as a series of events of M 4.2-4.9 in early to mid-February, 2020. Forecast 123386 expected this event within about 100 km of this epicenter around April 17.

 

O: 15APR2020 01:17:34  55.4N  158.4W mb=4.2  EMSC   ALASKA PENINSULA             

P: 17APR2020 123386    54.8N  158.7W 3.5-5.0 AAAAA  Alaska Peninsula           

 

Another M 4.2 also occurred in the Aleutian Islands in the Rat Islands area.

It was not reported felt in the area. The last earthquake in the Rat Islands of M>=4.2 occurred March 12, 2020. The largest such event in the past 6 months was an M 5.3 near today's epicenter on February 4, 2020. Forecast 123399 had xpected

today's event was likely within about 100 km around April 16.

 

O: 14APR2020 13:30:39  51.8N  178.2E mb=4.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 16APR2020 123399    51.0N  178.0E 4.0-5.6 AAAAA  Rat Islands                

 

An unusual earthquake of M 4.2 occurred off the coast of Syria today. NEIC reported it was felt with intensity II-III in Syria at Latakia, Jabian, Banias, as-Suqay, and ao-Dana. The mainshock was followed by a series of light aftershocks. The mainshock appears to be the strongest aftershock to date of an M 4.8 which shook the area on April 3. At the time this summary noted in this regard:

 

 

"An unusual earthquake off the coast of Syria of M 4.6 also occurred today. NEIC reported maximum shaking in Syria at Tartus,  Banias, Misiaf, Hama, and Jubayl, Juniyah, and Babda, Lebanon with II-III in This is the strongest event within about 200 km in Syria since an M 5.0 on July 29, 2015. Forecast 123048 had expected today's event within about 100 km was likely around April 4." (April 4, 2020)

 

Today's events were forecast to the north in #123368 around April 15.

 

O: 15APR2020 02:35:36  35.8N   35.6E ML=2.8  EMSC   NEAR THE COAST OF SYRIA

O: 14APR2020 22:55:21  35.8N   35.7E ML=2.0  EMSC   NEAR THE COAST OF SYRIA

O: 14APR2020 22:37:56  35.9N   35.5E mb=4.2  EMSC   NEAR THE COAST OF SYRIA

O: 15APR2020 00:52:01  35.9N   35.6E ML=2.6  EMSC   NEAR THE COAST OF SYRIA

O: 15APR2020 03:38:04  35.7N   35.7E ML=2.8  EMSC   NEAR THE COAST OF SYRIA      

P: 15APR2020 123368    41.0N   36.0E 3.5-5.2 ACAAA  No. Turkey/Black Sea        

 

The strongest earthquakes in the world today occurred along the coast of Chile

from the Tarapaca area in the north to Atacama and south to Valparaiso. Most of this activity was occurring around 144 degrees from the M 7.7 of March 25 in the Kuril Islands, and may have been promoted by energy from that source.

 

GUC reported the earthquake near Valparaiso, Chile was felt with intensity  V in  Valparaiso at Casablanca; IV in Algarrobo, Cartagena, El Quisco, El Tabo, III at San Felipe and II in San Antonio, Santo Domingo; in Santiago with V in San Bernardo; IV in El Monte, Tiltil; III iknCuracavi, Santiago; in O'Higgins with V in Marchihue, Rancagua, Rengo, Requinoa; IV in San Fernando, Santa Crus, Pumanque, Placilla, Puemo, Palmilla, Nancagua, Mostazal, Lolol, Litueche, Las Cabras, Donihue, Chepica, Chimbarongo, and in Maule with IV in Curico; III in Molina, San Clemente, and II in Constitucion and Iloca, Chile. There were no reports of substantial damage. NEIC reported this earthquake of M 4.8 in  O'Higgins, Chile was felt with intensity II-III in the area(s) of O'Higgins, Chile in Machali (IV); Paine, Buin, Puente Alto, Metropolitana; and Rancagua, San Bernardo, Penaflor, Santiago, Rengo and Lampa, Chile.

 

O: 14APR2020 16:02:09  33.9S   70.5W Mw=4.8  EMSC   REGION METROPOLITANA, CHILE  

O: 14APR2020 16:02     33.9S   70.5W mb=5.1  GUC    Valparaiso at Casablanca; IV i

P: 20APR2020 123454    35.0S   70.0W 4.0-5.6 CBAAA  Central Chile              

 

GUC reported the earthquake in Atacama, Chile was felt with intensity IV in  Atacama at El Salvador; III in Chanaral, Copiapo, Diego de Almagro and Tierra Amarilla, Chile.

 

O: 14APR2020 12:04     25.8S   69.3W mb=5.1  GUC    Atacama at El Salvador; III in

O: 14APR2020 12:04:30  25.8S   69.3W Mw=5.1  EMSC   ATACAMA, CHILE               

P: 15APR2020 123442    24.0S   69.0W 4.0-5.7 ABAAA  Coast No. Chile            

 

NEIC reported the earthquake of M 4.8 in Northern Chile  was felt with intensity II-III in the area(s) of Northern Chile in Tarapaca at Iquique and Arica.

 

O: 15APR2020 06:24:54  19.0S   69.5W ML=4.0  EMSC   TARAPACA, CHILE              

O: 15APR2020 00:19:01  20.2S   69.2W Mw=4.8  EMSC   TARAPACA, CHILE              

P: 14APR2020 123449    20.0S   70.0W 4.0-5.4 AAAAA  So. Peru/Bolivia            

 

O: 15APR2020 01:15:34  26.9S   63.4W Mw=5.3  EMSC   SANTIAGO DEL ESTERO, ARGENTINA

P: 11APR2020 123441    24.0S   64.0W 4.0-5.6 BCAAA  Argentina                  

 

 

STRONG EARTHQUAKE IN KERMADEC ISLANDS, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR APRIL 13, 2020

 

The strongest earthquake in the world today was an M 6.0 in the central Kermadec Islands of northern New Zealand. It was not reported felt in this remote area. The last earthquake in the Kermadec Islands with M>=6 within about 200 km  of today's epicenter occurred on September 27, 2019. The last of larger magnitude was an M 6.4 on June 21, 2019 following a series of such events in mid-June, 2019. The last such event within about 100 km of today's epicenter was an M 6.3 on July 13, 2016.  Forecast 123456 had expected today's event was likely in this area around April 14. This epicenter is at 104 degrees from the M 7.7 south of Cuba of January 28, 2020 and may have been promoted by energy from that source.

 

O: 14APR2020 01:06:44  30.5S  176.2W Mw=6.0  EMSC   KERMADEC ISLANDS REGION      

P: 14APR2020 123456    30.0S  178.0W 4.0-5.8 AABAA  No. Kermadec Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in the aftershock area of Southern Idaho. It was reported felt with intensity II-III throughout much of southern Idaho including at Stanley and Boise. This aftershock is still strong two weeks after the M 6.5 mainshock of March 31, 2020 and is likely to see similar activity in days to come. A list of regional events of M>=3 follows with a more complete listing of events of M>=2 in the "ROCKY MOUNTAIN" regional section below. Forecast 123361 expected today's activity within about 10 km was likely around April 12.

 

O: 14APR2020 02:26:21  44.3N  115.0W ML=3.2  EMSC   SOUTHERN IDAHO

O: 14APR2020 03:27:06  44.3N  115.0W ML=3.5  EMSC   SOUTHERN IDAHO

O: 13APR2020 12:34:03  44.3N  115.1W Ml=3.0  EMSC   SOUTHERN IDAHO

O: 14APR2020 02:09:56  44.4N  115.2W ML=3.4  EMSC   SOUTHERN IDAHO

O: 13APR2020 08:45:49  44.4N  115.2W Ml=3.9  EMSC   SOUTHERN IDAHO

P: 12APR2020 123361    44.5N  115.1W 2.0-3.9 AAAAA  Montana/Idaho              

 

Light aftershocks also occurred today in the Ridgecrest and Mammoth Lakes  regions of California. An M 3.3 in the Ridgecrest area was lightly felt along with a number of events of M>2 listed in the "CALIFORNIA" regional section below. This activity had been expected within about 15 km around April 14.

The Mammoth Lakes series which began two days ago with an M 5.2 also continued with light aftershocks which included two of M 3.1. Forecast 123293 and 123294  had expected the Mammoth lakes activity was likely around April 11-14 while the Ridgecrest activity had been forecast in #123291, both within about 25 km of the epicenters.

 

O: 13APR2020 19:04:07  38.0N  118.7W ML=3.1  EMSC   CENTRAL CALIFORNIA

O: 13APR2020 14:27:44  38.1N  118.7W ML=3.1  EMSC   CENTRAL CALIFORNIA

P: 11APR2020 123294    38.4N  118.7W 2.5-4.6 AAAAA  California/Nevada area     

P: 14APR2020 123293    37.9N  118.2W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 14APR2020 06:14:28  36.1N  117.9W ML=3.3  EMSC   CENTRAL CALIFORNIA           

P: 14APR2020 123291    35.7N  117.4W 2.5-4.5 AAAAA  California/Nevada area     

P: 18APR2020 123291    36.1N  118.1W 2.5-4.4 BAAAA  California/Nevada area     

 

 

An M 3.8 south of Alaska also occurred today. It was not reported felt in this remote area. This is the strongest earthquake within about 200 km of this epicenter since an M 4.0 on December 2, 2019. Forecast 123386 had expected today's event was likely around April 19 in this area.

 

O: 14APR2020 03:09:56  55.9N  155.8W mb=3.8  EMSC   SOUTH OF ALASKA              

P: 19APR2020 123386    54.7N  156.9W 3.5-5.1 BBAAA  Alaska Peninsula           

 

KURIL ISLANDS CONTINUE TO SHAKE

 

EARTHQUAKE SUMMARY FOR APRIL 12, 2020

 

 

The strongest earthquake in the world today was an M 5.2-5.3 in the Kuril Islands. It was not reported felt. The epicenter is about 300 km southwest of the epicenter of the M 7.7 of March 25 and probably occurred in an area where stress was concentrated after that event. An event near this epicenter of M 4.7 followed the M 7.7 mainshock, but the last earthquake of M>=5.2 within about 150 km of today's epicenter was an M 6.0 on August 10, 2018. Forecast 123363 had expected today's event in this area was likely in mid-April.

 

O: 13APR2020 01:42:55  48.4N  154.3E mb=5.2  EMSC   KURIL ISLANDS                

P: 16APR2020 123363    49.0N  155.0E 3.5-5.5 BAAAA  NE Pacific                 

 

An earthquake of M 5.2-5.3 also occurred today in New Britain, Papua New Guinea.

NEIC reported this earthquake of M 5.3 in New Britain, PNG  was felt with intensity II-III in the area(s) of New Britain, PNG at Rabaul, Eastern New Britain. The last earthquake in New Britain of equal or larger magnitude in the area was an 6.2 on February 9, 2020 about 100 km south of today's epicenter. Forecast 123228 had expected today's event in this area around April 13.

 

O: 12APR2020 12:25:10   4.3S  151.9E mb=5.3  EMSC   NEW BRITAIN REGION, P.N.G.   

O: 12APR2020 12:47:45   4.3S  152.0E mb=4.8  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 13APR2020 123228     5.0S  152.0E 4.0-5.5 AAAAA  New Britain                

 

The strongest earthquake in the U.S. today was an M 4.2 followed about 45 minutes later by an M 3.6 in the island of Hawaii. This is the strongest earthquake in Hawaii since an M 4.2 on February 3, 2020 and an M 4.9 on November 11, 2019. NEIC reported this earthquake of M 3.6-4.2  in Hawaii  was felt with intensity II-III in the area(s) of Hawaii a Pahala, Hawaii National Park, Naalehu, Volcano, Captain Cook, Mountain View, Panoa, Hilo, Holualoa and Kurtistown. An aftershock of M 3.2 was felt with intensity II-III in the same area. The area of Hawaii has been showing increased seismicity in recent weeks, perhaps precursory to another volcanic eruption similar to that of the summer of 2018. Forecast 123252 had expected today's activity was likely in mid-April.

 

O: 12APR2020 23:45:09  19.3N  155.4W ML=4.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 12APR2020 22:09:43  19.4N  155.6W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 13APR2020 00:31:20  19.3N  155.4W ML=3.6  EMSC   ISLAND OF HAWAII, HAWAII     

P: 17APR2020 123252    19.2N  155.2W 3.0-4.5 BAAAA  Hawaii                      

 

The strongest earthquake in the U.S. or Canada outside Hawaii today was an M 3.4 in southern Idaho. This is an aftershock of the M 6.5 quake of March 31, 2020. The strongest aftershock to date was an M 4.6 which occurred yesterday. Forecast

123361 had expected today's event was likely within about 15 km of today's epicenter around April 12.

 

O: 12APR2020 21:17:39  44.4N  115.2W ML=3.4  EMSC   SOUTHERN IDAHO

O: 12APR2020 10:19:08  44.4N  115.2W Ml=3.3  EMSC   SOUTHERN IDAHO

P: 12APR2020 123361    44.5N  115.1W 2.0-3.9 AAAAA  Montana/Idaho              

 

The strongest aftershock in the area near Mammoth Lakes, California today was

M 3.0 - of which there were four such events. The aftershock sequence in the area is likely to be short-lived as it overlays a hot zone. Forecasts 123293 and 123294 had expected today's activity in this area in mid-April. NEIC reported these earthquakes of M 3.0-3.5 in Mammoth Lakes, California  were felt with intensity II-III in the area(s) of Mammoth Lakes, California.

 

O: 12APR2020 09:20:55  38.0N  118.7W ML=3.0  EMSC   CENTRAL CALIFORNIA

O: 12APR2020 07:20:05  38.1N  118.7W ML=3.0  EMSC   CENTRAL CALIFORNIA

O: 12APR2020 15:20:00  38.1N  118.7W ML=3.0  EMSC   CENTRAL CALIFORNIA

O: 13APR2020 02:10:34  38.1N  118.7W ML=3.0  EMSC   CENTRAL CALIFORNIA

P: 11APR2020 123294    38.4N  118.7W 2.5-4.6 AAAAA  California/Nevada area     

P: 14APR2020 123293    37.9N  118.2W 2.5-4.8 AAAAA  California/Nevada area     

P: 18APR2020 123294    38.0N  118.8W 2.5-4.6 BAAAA  California/Nevada area     

 

MODERATE M 5.2 SHAKES MAMMOTH LAKES AREA, CALIFORNIA

 

EARTHQUAKE SUMMARY FOR APRIL 11, 2020

 

The strongest earthquake in the U.S. or Canada today was an M 5.2 which was felt widely in the Mammoth Lakes region of Central California and Nevada. NEIC reported maximum intensity IV in California at Benton, June Lake, and Yosemite National Park and in Luning Nevada. Intensity II-III was felt within about 100 km of the epicenter in California at Bishop, Coleville, Mammoth Lakes, Bridgeport and Lee Vining, and in Hawthorne, Nevada. A series of moderate aftershocks followed including an M 4.5. This is the strongest earthquake within the state of California since the M 7.1 Ridgecrest earthquake of July 6, 2019. An M 5.8 hit off the coast of California on March 9, 2020 and two events of M 5.2 each hit off the northern coast on March 18, 2020 and October 28, 2019.

It is also the strongest in the general area of eastern California and Nevada since an M 5.8 on December 28, 2016 about 40 km north of today's epicenter in Nevada. Prior to that an M 5.4-5.5 hit near today's epicenter on September 18, 2004. The possibility of a moderate quake in this area at this time has been discussed in previous issues of this summary, for example in yesterday's summary it was noted:

 

"A nor'easter hit yesterday in the area of the northeastern U.S. dropping up to 20 inches of snow in some portions of northern New England. This summary noted the likelihood of a moderate earthquake in California with storms of this type in a previous issue as:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Mammoth Lakes, California area. NEIC reported intensity III-IV in Mammoth Lakes and northeast Fresno County and II-III within about 100 km at June Lake, Benton, Bishop, Shaver Lake, Oakhurst, Bass Lake and Yosemite. This may be related to the strong nor'easter which was simultaneous with the M 4.9 in Southern California yesterday. A pair of light earthquakes were also felt in the San Francisco area today with M 2.4 and 2.7. California may be heading into a period of high seismicity which generally lasts from mid-April to early May and can include moderate to strong quakes near the coast. Researchers have suggested this seasonal pattern may be related to weather, percolation and rainfall. The largest event in this period in the State was an M 8.3 in San Francisco in 1906. Weather was factor in that event, although not a strong nor'easter, weather maps from this date show a strong low pressure system over the area with winds to the northeast, typical of a nor'easter. While details cannot be found the strongest snowfall event in the northeastern U.S. occurred about a week before the San Francisco earthquake - for example, measuring 15 inches on April 10 in Portland, Maine, the largest snowfall in April ever recorded. This was probably part of a regional nor'easter. More directly associated with this northeastern U.S. weather event was an M 7.5, also on April 10, 1906 in the Gulf of California - a direct precursor to the San Francisco quake. A felt foreshock to that event occurred 10 hours after the Gulf of California event in San Francisco of unknown magnitude. Unusual local winds from the east were blowing when the earthquake occurred. These strange winds were one of the prime causes of the massive fire which followed the earthquake. A strong storm dumped inches of snow in the Mammoth Lakes region today and may have helped promote this unusual earthquake of M 4.4." (April 6, 2020)

 

Like the event of April 5, a strong snowstorm also hit eastern California today. " (April 10-11, 2020)

 

Following is a listing of shocks in the area of the mainshock today with M>=3. A more complete listing of M>=2 events can be found in the regional "CALIFORNIA" section of this summary. Forecast 123294 had expected today's activity was likely within about 25 km of the epicenter around April 11. This activity is located at 101 degrees from the M 6.8 in eastern Turkey of January 24 and at the sixth node (60 degrees) from the M 7.7 in the Kuril Islands of March 25 and was probably promoted by energy from those sources.

 

O: 11APR2020 21:36:45  38.0N  118.8W Mw=3.8  EMSC   CENTRAL CALIFORNIA

O: 11APR2020 16:22:50  38.0N  118.8W Mw=4.5  EMSC   CENTRAL CALIFORNIA

O: 11APR2020 15:46:52  38.1N  118.7W ML=3.2  EMSC   CENTRAL CALIFORNIA

O: 11APR2020 14:51:14  38.1N  118.7W ML=3.3  EMSC   CENTRAL CALIFORNIA

O: 11APR2020 19:20:08  38.1N  118.7W ML=3.3  EMSC   CENTRAL CALIFORNIA

O: 11APR2020 18:02:23  38.1N  118.7W Ml=3.2  EMSC   CENTRAL CALIFORNIA

O: 11APR2020 14:36:37  38.1N  118.7W Mw=5.2  EMSC   CENTRAL CALIFORNIA

O: 11APR2020 17:53:44  38.1N  118.8W ML=3.1  EMSC   CENTRAL CALIFORNIA

O: 11APR2020 16:29:50  38.1N  118.8W ML=3.4  EMSC   CENTRAL CALIFORNIA

O: 11APR2020 14:40:17  38.1N  118.8W Ml=3.0  EMSC   CENTRAL CALIFORNIA

O: 11APR2020 16:57:45  38.1N  118.8W Mw=4.1  EMSC   CENTRAL CALIFORNIA

P: 11APR2020 123294    38.4N  118.7W 2.5-4.6 AAAAA  California/Nevada area     

 

The strongest earthquake in the world today was an M 6.1 in the South Indian Ocean. Only two other events of M>=6.1 have hit within about 300 km of this epicenter in the past 30 years - an M 6.2 on May 14, 2002 and an M 5.4 on October 4, 2013. While Oklahoma became active with and M 5.6-5.7 on November 6, 2011, widespread activity did not commence until December, 2013 after the October 4 event in the South Indian Ocean.

 

This epicenter is antipodal to eastern and southern Colorado and western Texas and Oklahoma where a series of moderate earthquakes

 has occurred in the past month. This included an M 5.0 in Texas on March 26, the largest seen in that area in years. It is nearly exactly antipodal to another unusual earthquake in Colorado on April 6. At the time this summary noted:

 

 

"Two unusual earthquakes occurred today in the U.S. These were located in Ohio (M 2.2) and Colorado (M 2.7). The event in Colorado was located in the southeastern portion of the state. It is the strongest event in southeastern Colorado within about 100 km of this epicenter since an M 3.4 on January 2, 1998 about 50 km to the northwest. The only other regional event of M>=2.7 since 1990 was an M 3.4 in New Mexico on June 19, 2002." (April 6, 2020)

 

A series of moderate earthquakes has been occurring in the Trinidad, Colorado area since September 2001 near the antipode of today's Indian Ocean event. The cause of these is unknown but may be related to the wider activation of Oklahoma and Kansas which followed and made this area the most seismic in the lower states of the U.S. These areas may be activated following the M 6.1 in the Indian Ocean.

 

Forecast 123459 had expected today's event in the Indian Ocean within about 100

km was likely around April 12.

 

O: 12APR2020 06:57:52  36.9S   77.4E Mw=6.1  EMSC   MID-INDIAN RIDGE             

P: 12APR2020 123459    37.0S   79.0E 4.0-5.4 AAAAA  So. Indian Ocean           

 

Two earthquakes of M 2.7 and 3.4 hit western Texas today after the M 6.1 in the

South Indian Ocean. Forecast 123323 had expected this activity around April 13.

 

O: 12APR2020 03:11:51  31.7N  104.4W ML=3.4  EMSC   WESTERN TEXAS                 

O: 12APR2020 05:57:25  31.7N  104.4W mb=2.7  EMSC   WESTERN TEXAS                

P: 13APR2020 123323    32.0N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

P: 16APR2020 123323    32.6N  104.6W 2.0-4.0 BAAAA  SW U.S.A                    

 

An M 5.1 was felt in the region north of Tokyo, Eastern Honshu, Japan today. NEIC reported maximum intensity VI in Tochigi; V in Ibaraki, IV in Mitsukaido, Saitama, Chiba. No major damage was reported.  The last earthquake of M>=5.1 within about 100 km of Tokyo was an M 5.3 on January 31, 2020 and prior to that an M 5.2 on October 12, 2018. Forecast 123321 had expected a moderate event in this region in mid-April.

 

O: 11APR2020 15:44:48  36.2N  139.9E mb=5.1  EMSC   EASTERN HONSHU, JAPAN        

P: 15APR2020 123321    37.0N  141.0E 4.0-5.6 BAAAA  Off East Coast Honshu      

 

A light earthquake of M 2.1 occurred today in western Maine. It was not reported felt in this area. The only event of larger magnitude within about 100 km of this epicenter in the past three years was an M 2.3 on September 7, 2019.  Forecast 123108 had expected this event was likely in this area around April 9. This may be related to the strong nor'easter two days ago in the area as noted above.

 

O: 11APR2020 10:36:12  44.7N   68.9W ML=2.1  EMSC   MAINE                        

P:  9APR2020 123108    44.0N   68.0W 2.0-4.1 AAAAA  Maine                      

 

Aftershocks also continued in Southern Idaho today. The strongest of these was an  M 4.6. This is the strongest aftershock to date since the M 6.5 on March 31, 2020 and an immediate aftershock 35 minutes later of M 4.6 and the second strongest in the region since January 3, 2015. Following is a listing of afershocks today of M>=3 in southern Idaho.

 

NEIC reported the earthquake of M 3.8 in Southern Idaho  was felt with intensity II-III in the area(s) of Southern Idaho at McCall, Garden Valley, Garden City, Salmon and Kuna. The M 4.6 in Southern Idaho felt with intensity II-III in Stanley, Lowman, Garden City and Boise.

 

O: 11APR2020 18:07:58  44.3N  115.1W ML=3.2  EMSC   SOUTHERN IDAHO

O: 12APR2020 02:45:11  44.3N  115.1W ML=3.2  EMSC   SOUTHERN IDAHO

O: 11APR2020 07:38:44  44.3N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 11APR2020 17:57:39  44.3N  115.2W Ml=4.6  EMSC   SOUTHERN IDAHO

O: 12APR2020 03:09:52  44.5N  115.2W ML=3.8  EMSC   SOUTHERN IDAHO

O: 11APR2020 19:33:31  44.6N  115.2W ML=3.6  EMSC   SOUTHERN IDAHO               

P: 12APR2020 123361    44.5N  115.1W 2.0-3.9 AAAAA  Montana/Idaho              

 

 

 

 

 

M 5.9-6.3 ENDS SEISMIC QUIET PERIOD

 

EARTHQUAKE SUMMARY FOR APRIL 10, 2020

 

The strongest earthquake in the world today was an M 5.9-6.3 north of the Northern Philippines. NEIC reported maximum intensity VI in Basco, Cagayan Valley, Philippines and V in Ballesteros and Calog. Lesser shaking of III-IV was reported felt in Taiwan and as far as 400 km from the epicenter. PHIVOLCS reported intensity IV in Basco, Itbayat, Mahatao, Ivana, Uyugan and Sabtang, Batnes at Calayan and Pamplona; III in Tuguegarao City, Claveria and Sta. Ana, Cagayan; Luna, Apayao and II in Laoag City, Illocos Norte; Lasam and Solana, Cagayan; and in Flora, Apayao, Philippines. This appears to conclude the seismic quiet period associated with the full moon. This had been anticipated in previous issues of this report as:

 

"The full moon will arrive at 02:35 UT on April 8. This is the last of a series of three super-moons. It is likely that global seismicity will be low to moderate during the next five days increasing after that. Areas at local solar midnight with this Full moon are near 40 West while those at local noon are near 140 East longitude. These may see some increased seismicity during this time and include much of the western Pacific rim." (April 6-7, 2020)

 

Today's event north of Batan, Philippines is the first of M>=5.9 in this area since an M 6.0 on July 26, 2019 and may be an aftershock of that quake. Prior to that the last such event was an M 6.0 on September 6, 2013. Forecast 123286 had expected today's event in mid-April to the north of this epicenter. This epicenter is at 101 degrees from the M 7.1 in Central California of July 6, 2019 and at the fifth node (72 degrees) from the M 6.8 in eastern Turkey of January 24 and may have been promoted by energy from those sources.

 

O: 10APR2020 16:44:56  20.5N  122.1E Mw=5.9  EMSC   BATAN ISL REGION, PHILIPPINES

O: 10APR2020 16:44:56  20.5N  122.1E Mw=6.0  PHIV   BATAN ISL REGION, PHILIPPINES

O: 10APR2020 16:44:56  20.5N  122.1E Mw=6.3  BMG    BATAN ISL REGION, PHILIPPINES

P: 15APR2020 123286    23.0N  122.0E 4.0-5.4 BCAAA  Taiwan                     

 

The largest earthquake in California today was an M 3.4 in Central California. NEIC reported it was felt with intensity II-III in Fresno, Clovis and San Juan Bautista. A nor'easter hit yesterday in the area of the northeastern U.S. dropping up to 20 inches of snow in some portions of northern New England. This summary noted the likelihood of a moderate earthquake in California with storms of this type in a previous issue as:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Mammoth Lakes, California area. NEIC reported intensity III-IV in Mammoth Lakes and northeast Fresno County and II-III within about 100 km at June Lake, Benton, Bishop, Shaver Lake, Oakhurst, Bass Lake and Yosemite. This may be related to the strong nor'easter which was simultaneous with the M 4.9 in Southern California yesterday. A pair of light earthquakes were also felt in the San Francisco area today with M 2.4 and 2.7. California may be heading into a period of high seismicity which generally lasts from mid-April to early May and can include moderate to strong quakes near the coast. Researchers have suggested this seasonal pattern may be related to weather, percolation and rainfall. The largest event in this period in the State was an M 8.3 in San Francisco in 1906. Weather was factor in that event, although not a strong nor'easter, weather maps from this date show a strong low pressure system over the area with winds to the northeast, typical of a nor'easter. While details cannot be found the strongest snowfall event in the northeastern U.S. occurred about a week before the San Francisco earthquake - for example, measuring 15 inches on April 10 in Portland, Maine, the largest snowfall in April ever recorded. This was probably part of a regional nor'easter. More directly associated with this northeastern U.S. weather event was an M 7.5, also on April 10, 1906 in the Gulf of California - a direct precursor to the San Francisco quake. A felt foreshock to that event occurred 10 hours after the Gulf of California event in San Francisco of unknown magnitude. Unusual local winds from the east were blowing when the earthquake occurred. These strange winds were one of the prime causes of the massive fire which followed the earthquake. A strong storm dumped inches of snow in the Mammoth Lakes region today and may have helped promote this unusual earthquake of M 4.4." (April 6, 2020)

 

 

Like the event of April 5, a strong snowstorm also hit eastern California today. The M 3.4 is the strongest within about 50 km of this epicenter since an M 4.0 on March 3, 2020 and may be an aftershock of that event. Forecast 123056 had expected today's event was likely within about 25 km of this epicenter around April 9.

 

O: 10APR2020 08:59:14  36.4N  120.6W ML=3.4  EMSC   CENTRAL CALIFORNIA           

P:  9APR2020 123056    36.2N  120.8W 2.5-4.4 AAAAA  Central California         

 

FULL MOON CONTINUES TO DAMPEN GLOBAL SEISMICITY

 

EARTHQUAKE SUMMARY FOR APRIL 9, 2020

 

It was another quiet day in global seismicity today with the largest event barely an M 5.0. This quiet began several days before the full moon of April 8 and has continued since. This summary had expected this in previous issues as:

 

 

"The full moon will arrive at 02:35 UT on April 8. This is the last of a series of three super-moons. It is likely that global seismicity will be low to moderate during the next five days increasing after that. Areas at local solar midnight with this Full moon are near 40 West while those at local noon are near 140 East longitude. These may see some increased seismicity during this time and include much of the western Pacific rim." (April 6-7, 2020)

 

The largest quakes today were on mid-ocean Ridges. The largest was an M 5.2 in the Chagos Archipelago south of Pakistan. An M 5.1 occurred in the northern Mid-Atlantic Ridge and an M 5.0 southeast of Easter Island. These were not reported felt in these epicentral areas. The event in the Mid-Atlantic had been expected around April 9 in forecast 123039 while that in the Pacific was anticipated to the  east in mid-April. Forecast 122994 had expected the Chagos quake in early April.

 

O:  9APR2020 10:53:51  35.9S  103.9W mb=5.0  EMSC   SOUTHEAST OF EASTER ISLAND   

P: 19APR2020 123461    36.0S   97.0W 4.0-5.4 CACAA  Chile Rise                 

 

O:  9APR2020 12:20:36  24.9N   45.9W mb=5.1  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P:  9APR2020 123039    23.0N   45.0W 4.0-5.6 ABAAA  Mid-Atlantic Ridge         

 

O:  9APR2020 17:26:27   5.3S   68.7E mb=5.2  EMSC   CHAGOS ARCHIPELAGO REGION    

P:  7APR2020 122994     1.0S   67.0E 4.0-5.5 ACBAA  Indian Ocean               

 

Other earthquakes of M 5.0 occurred today in Guam and in Argentina but were not reported felt or damaging.

 

O:  9APR2020 09:43:58  24.2S   67.0W mb=5.0  EMSC   SALTA, ARGENTINA             

P:  7APR2020 123176    23.0S   66.0W 4.0-5.7 ABAAA  Argentina                  

 

O: 10APR2020 04:40:18  12.5N  144.0E mb=5.0  EMSC   GUAM REGION                  

P:  7APR2020 123033    13.0N  143.0E 4.0-5.6 BAAAA  So. Marianas/Guam          

 

An unusually large earthquake of M 4.5 also shook the region of Mozambique in southern Africa today. This is at an active area in Mozambique and is part of the East Africa Rift zone. The last earthquake of M>=4.5 within about 150 km of this epicenter was an M 4.6 on June 18, 2017 and prior to that an M 5.6 on September 22, 2016 and an M 4.6 on August 20, 2013. An event about 150 km to the northwest hit the area with M 5.4 on December 22, 2018. Forecast 123183 had expected today's event within about 50 km was likely around April 9.

 

O: 10APR2020 00:20:30  21.5S   33.4E mb=4.5  EMSC   MOZAMBIQUE                   

P:  9APR2020 123183    22.0S   33.0E 4.0-5.5 AAAAA  So. Indian Ocean           

 

The strongest earthquake in the U.S or Canada today was an M 4.1 in the Fox Islands. It was followed by an M 3.6 about 100 km northeast of the epicenter later in the day. The last earthquake of M>=4.1 within about 150 km of this activity in the Fox Islands was an M 4.8 on March 1, 2020. The last within about 100 km of larger magnitude was an M 5.0 on January 13, 2020. Forecast 123132 had expected a moderate event in the area was likely around April 6.

 

O:  9APR2020 07:43:24  52.0N  171.2W mb=4.1  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O:  9APR2020 14:16:49  52.7N  170.6W ml=3.6  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  6APR2020 123132    52.3N  171.6W 3.5-5.0 BAAAA  Andreanoff Isls, Aleutians 

 

 

MODERATE QUAKES CONTINUE IN FIJI

 

EARTHQUAKE SUMMARY FOR APRIL 8, 2020

 

The strongest earthquake in the world today was an M 5.4 in the area of Fiji, the only event of M>=5 in the world today. This event was probably promoted, as noted in previous issues of this summary be stresses from Tropical Cyclone Harold, a powerful ocean storm currently passing through the region. As it occurred near local solar midnight it may also have been enhanced by the current geomagnetic storm and/or stresses associated with the full moon as noted in previous issues:

 

"The full moon will arrive at 02:35 UT on April 8. This is the last of a series of three super-moons. It is likely that global seismicity will be low to moderate during the next five days increasing after that. Areas at local solar midnight with this Full moon are near 40 West while those at local noon are near 140 East longitude. These may see some increased seismicity during this time and include much of the western Pacific rim." (April 6-7, 2020)

 

and

 

"TC Harold continued today in the region of Fiji with winds up to 145 kts. It is expected to track to the south and east over the next several days. Seismicity on the area of Tonga and Fiji is likely to be enhanced while ths cyclone is in the region." (April 6-8, 2020)

 

Forecast 123165 had expected today's event within about 100 km was likely around April 7.

 

O:  8APR2020 10:02:31  15.7S  177.6W Mw=5.4  EMSC   FIJI REGION                  

P:  7APR2020 123165    15.0S  177.0W 4.0-5.4 AAAAA  Samoa Islands               

 

Aftershocks continued in southern Idaho today. The strongest of these - an M 4.0 - was reported felt with intensity II-III in Idaho at Boise, Stanley, and Ontario. This event is the strongest in the U.S. or Canada today. It is not part of the classical aftershock sequence but is located about 30-40 km south of the mainshock of M 6.5 on March 31. A foreshock of M 3.0 preceded the M 4.0 by about two minutes. The last earthquake of M>=3.7 within about 40 km of this epicenter was an M 3.6 and M 3.7 on November 26 and 27, 2008. No such events with M>=4 have hit the area in at least 30 years. It may represent an area where stress accumulated following the M 6.5 mainshock and where further activity is likely. Forecast 123110 had expected continuing aftershocks in early April.

 

Following is a list of regional earthquakes in southern Idaho today with M>=3.

Others can be found under the "ROCK MOUNTAIN" section below.

 

O: 08APR2020 17:21:59  44.2N  115.1W ML=3.0  EMSC   SOUTHERN IDAHO

O: 08APR2020 19:52:01  44.4N  115.2W Ml=3.3  EMSC   SOUTHERN IDAHO

O: 08APR2020 08:52:06  44.4N  115.2W Ml=3.7  EMSC   SOUTHERN IDAHO

O: 08APR2020 22:17:06  44.4N  115.2W Ml=3.8  EMSC   SOUTHERN IDAHO

O: 09APR2020 06:24:19  44.5N  115.2W ML=3.7  EMSC   SOUTHERN IDAHO

O:  8APR2020 17:23:46  44.1N  115.1W Ml=4.0  EMSC   SOUTHERN IDAHO               

P:  5APR2020 123110    44.4N  115.1W 2.0-4.1 ABAAA  Montana/Idaho              

 

 

Aftershocks also continued in southern California. NEIC reported the largest of these of M 2.9 was felt with intensity II-III in Mountain Center, Anza, Palm Desert, Rancho Mirage, Menifee, Sun City, Yucca Valley, San Bernardino and Los Angeles. Forecast 123081 had expected this activity was likely around April 7.

 

O: 08APR2020 07:59:07  33.2N  116.7W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 09APR2020 03:46:00  33.5N  116.5W ML=2.6  EMSC   SOUTHERN CALIFORNIA

O: 09APR2020 05:14:49  33.5N  116.5W ML=2.9  EMSC   SOUTHERN CALIFORNIA

O: 09APR2020 05:13:56  33.5N  116.5W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 08APR2020 09:30:25  33.5N  116.5W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O:  8APR2020 09:41:09  33.5N  116.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P:  7APR2020 123081    32.9N  116.6W 2.5-4.4 AAAAA  So. California             

 

The strongest aftershock in Puerto Rico today was an M 3.9. This followed an M 4.0 in the area yesterday. NEIC reported these were felt in San Juan, Puerto Rico with intensity II-III. Forecast 123032 had expected this activity was likely around April 6.

 

O:  8APR2020 08:43:54  19.6N   65.5W Md=3.9  EMSC   PUERTO RICO REGION           

P:  6APR2020 123032    19.0N   66.0W 3.4-5.3 AAAAA  Puerto Rico                

 

An unusual earthquake of M 3.7-4.4 occurred today in the area of Christchurch, South Island, New Zealand. GEONET reported this earthquake was felt with moderate intensity in the area of northern South Island, New Zealand. 8963 people reported feeling this earthquake including 2527 with weak intensity; 5000 with light intensity; 1350 with moderate shaking 83 with strong; 0 with severe and  3 with extreme intensity. There were no immediate reports of damage or casualties. NEIC reported this earthquake of M 3.7 in South Island, New Zealand  was felt with intensity II-III in the area(s) of South Island, New Zealand in Christchurch and Rangiora, Canterbury. The last earthquake reported within about 100 km of this epicenter in South Island by NEIC with M>=4.4 occurred March 13, 2017 with M 4.4. The last of larger magnitude was an M 4.8 on March 1, 2017. These were part of the aftershock sequence following the M 7.8 Christchurch quake of November 13, 2016. Forecast 123198 had expected today's event in this area was likely around April 8.

 

O:  8APR2020 19:49:15  43.6S  172.5E ML=3.7  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 08APR2020 19:49:16  43.6S  172.5E MS=4.4  GEONET Felt with moderate intensity

P:  8APR2020 123198    43.0S  171.0E 3.0-5.3 AAAAA  So. Island, N.Z.           

 

MODERATE SEISMICITY CONTINUES IN SOUTH SANDWICH ISLANDS

 

EARTHQUAKE SUMMARY FOR APRIL 7, 2020

 

The largest earthquake in the world today was an M 5.1-5.2 in the South Sandwich Islands southeast of Southern South America and north of Antarctica. This continues a series of such events in the region which have followed the M 7.7 in the Kuril Islands of March 25. The South Sandwich Islands are antipodal to the Kurils and likely have been promoted by antipodal effects from that event. Forecast 123202 had expected today's event within about 50 km of this epicenter was likely around April 5. The epicenter was near local solar noon at the time of the event and may also have been related to tidal effects associated with the full moon as noted in previous summaries:

 

"The full moon will arrive at 02:35 UT on April 8. This is the last of a series of three super-moons. It is likely that global seismicity will be low to moderate during the next five days increasing after that. Areas at local solar midnight with this Full moon are near 40 West while those at local noon are near 140 East longitude. These may see some increased seismicity during this time and include much of the western Pacific rim." (April 6-7, 2020)

 

O:  7APR2020 16:12:21  56.3S   27.0W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  5APR2020 123202    56.0S   26.0W 4.0-5.8 AAAAA  So. Sandwich Islands       

 

An M 5.2 also hit the region of Tonga today and was followed by an M 4.5 in the Fiji Islands. The M 5.2 in Tonga occurred within minutes of local solar midnight and was probably promoted by the full moon today. These events were also probably promoted by stresses from the major Tropical Cyclone Harold which was located over the Fiji epicenter when that quake occurred. This had been expected in this and previous issues of this summary as:

 

"TC Harold continued today in the region of Fiji with winds up to 145 kts. It is expected to track to the south and east over the next several days. Seismicity on the area of Tonga and Fiji is likely to be enhanced while ths cyclone is in the region." (April 6-8, 2020)

 

O:  7APR2020 11:32:06  15.3S  173.3W mb=5.2  EMSC   TONGA                        

P:  5APR2020 123165    15.0S  173.0W 4.0-5.8 AAAAA  Samoa Islands              

 

O:  7APR2020 19:43:43  18.1S  177.7W mb=4.5  EMSC   FIJI REGION                  

P:  1APR2020 122945    18.0S  177.0W 4.0-5.3 CAAAA  Tonga Islands              

P:  6APR2020 123173    19.0S  176.0W 4.0-5.6 AAAAA  Tonga Islands              

 

Aftershocks also continued in the region of Southern California following the M 4.9 there two days ago. NEIC reported the largest of these - of M 3.5 - was felt with intensity II-III in Southern California at Mountain Center, Palm Desert, Palm Springs, Indian Wells, La Quinta, Rancho Mirage, Hemet, Cathedral City, and Idyllwild. A listing of events in the area of M>=3 follows. A more complete listing is found in the "CALIFORNIA" regional section below.

 

O: 08APR2020 00:35:55  33.5N  116.5W ML=3.1  EMSC   SOUTHERN CALIFORNIA

O: 08APR2020 01:00:13  33.5N  116.5W ML=3.1  EMSC   SOUTHERN CALIFORNIA

O: 08APR2020 00:30:48  33.5N  116.5W ML=3.4  EMSC   SOUTHERN CALIFORNIA

P:  7APR2020 123081    32.9N  116.6W 2.5-4.4 AAAAA  So. California             

 

Aftershocks also continued in southern Idaho today. The strongest of these of M 3.9 and M 3.9 were felt with intensity II-IV in Idaho at Ketchum, Boise and Eagle. These were the largest earthquakes in the U.S. or Canada today. Moderate seismicity had been expected in forecast 123110 in the area around April 5. Following is a listing of aftershocks of M>=3 today, a more complete listing is found in the "ROCKY MOUNTAIN" regional section below.

 

O: 07APR2020 12:14:54  44.2N  115.1W Ml=3.2  EMSC   SOUTHERN IDAHO

O: 07APR2020 23:34:12  44.3N  115.2W Ml=3.2  EMSC   SOUTHERN IDAHO

O: 07APR2020 12:52:37  44.3N  115.3W Ml=3.0  EMSC   SOUTHERN IDAHO

O: 07APR2020 09:18:31  44.3N  115.3W Ml=3.9  EMSC   SOUTHERN IDAHO

O: 07APR2020 12:33:01  44.4N  115.2W Ml=3.0  EMSC   SOUTHERN IDAHO

O: 07APR2020 23:18:15  44.4N  115.2W Ml=3.2  EMSC   SOUTHERN IDAHO

O: 07APR2020 09:08:26  44.4N  115.2W Ml=3.4  EMSC   SOUTHERN IDAHO

O: 07APR2020 07:08:31  44.4N  115.2W Ml=3.5  EMSC   SOUTHERN IDAHO

O:  7APR2020 08:57:55  44.5N  115.2W Ml=3.9  EMSC   SOUTHERN IDAHO               

P:  5APR2020 123110    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

 

MODERATE QUAKE SHAKES TRINIDAD AND TOBAGO

 

EARTHQUAKE SUMMARY FOR APRIL 6, 2020

 

An earthquake of M 5.2 was felt in the area of Trinidad and Tobago today. NEIC reported intensity IV in Trinidad and Tobago at Tacarigua, and Port-of-Spain and in Saint George's, Grenada. Intensity II-III was also reported in Trinidad and Tobago at Scarborough, Arima, Sangre Grande, Tunapuna, Mucurapo, Chaguanas and in Hamilton, Grenadines. This activity is within about 100 km of exactly antipodal to the recent swarm of earthquakes in Sumbawa, Indonesia. The largest of this antipodal activity was an M 5.1 on March 15. Further enhancement in the region of Sumbawa is expected in the next several days due to antipodal effects from Trinidad and Tobago. An M 7.3 quake hit the area about 200 km southwest of today's epicenter on August 21, 2018 but the last such event within about 100 km was an M 5.4 on November 5, 2017. Forecast 123034 had expected today's event was likely within about 100 km around April 3.

 

O:  7APR2020 03:26:51  11.7N   61.2W Mw=5.2  EMSC   TOBAGO REGION, TRINIDAD-TOBAGO

P:  3APR2020 123034    11.0N   62.0W 3.4-5.4 BAAAA  Windward Islands           

 

An unusual aftershock of M 5.2 also occurred in the area east of the Kuril Islands where the M 7.7 occurred March 25. This unfelt event is the strongest aftershock after March 25 in the area. Forecast 123111 had expected this activity was likely in early April. This epicenter is about 40 km northeast of the mainshock and may represent the locale of accumulated stress in the area.

 

O:  7APR2020 06:27:17  49.2N  157.9E mb=5.2  EMSC   EAST OF KURIL ISLANDS        

P:  3APR2020 123111    49.0N  158.0E 3.5-5.4 BAAAA  NE Pacific                 

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. This is probably an aftershock of the M 6.0 of January 26, 2020 about 25 km to the north of today's epicenter. Forecast 123132 had expected today's activity within about 10 km was likely around April 7.

 

O:  6APR2020 10:14:48  51.1N  179.9W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  7APR2020 123132    51.0N  179.9W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

Two unusual earthquakes occurred today in the U.S. These were located in Ohio (M 2.2) and Colorado (M 2.7). The event in Colorado was located in the southeastern portion of the state. It is the strongest event in southeastern Colorado within about 100 km of this epicenter since an M 3.4 on January 2, 1998 about 50 km to the northwest. The only other regional event of M>=2.7 since 1990 was an M 3.4 in New Mexico on June 19, 2002. Forecast 123060 had expected activity in this area was possible around April 7.

 

NEIC reported this earthquake of M 2.7 in Colorado  was felt with intensity II-III in the area(s) of Colorado at Pritchett.

 

O:  6APR2020 17:04:52  37.4N  103.0W mb=2.7  EMSC   COLORADO                     

P:  7APR2020 123060    36.9N  105.1W 2.0-4.0 AABAA  Colorado area              

 

The last event in Ohio with M>=2.2 was an M 2.6 on December 7, 2019 and prior to that an M 2.6 within about 15 km of today's epicenter on October 15, 2019. There were no initial felt reports with today's event. Forecast 123120 had expected a light earthquake in the area of Ohio within about 100 km of today's epicenter was likely around April 4.

 

O:  7APR2020 01:51:09  41.8N   81.1W ML=2.2  EMSC   OHIO                         

P:  4APR2020 123120    42.0N   80.0W 2.0-3.9 BAAAA  Ohio/Lake Erie             

 

STRONG EARTHQUAKE IN MOLUCCA SEA, INDONESIA

 

EARTHQUAKE SUMMARY FOR APRIL 5, 2020

 

The strongest earthquake in the world today was an M 5.9 in the Molucca Sea, Indonesia. NEIC reported it was felt with intensity IV in Manado, Sulawesi and II in Bitung, Sulawesi, Indonesia. BMG reported this quake with M 6.1 was felt with intensity III-IV in Bitung, Siau and Manado and II in Ternate, Indonesia.

This is the strongest earthquake in the Molucca Sea since an M 7.1 on November 14, 2019. Forecast 122985 had expected today's event was likely within about 150 km of this epicenter around April 6. This epicenter is at 146 degrees from the M 7.7 in Cuba of January 28 and may have been promoted by energy from that source.

 

O: 05APR2020 22:42:28   1.4N  126.5E mb=4.7  EMSC   MOLUCCA SEA

O: 06APR2020 05:31:04   1.5N  126.5E mb=4.8  EMSC   MOLUCCA SEA

O: 05APR2020 18:37:10   1.4N  126.4E mw=5.9  ANSS   Kota Ternate Indonesia

O:  5APR2020 18:37:11   1.4N  126.4E Mw=5.9  EMSC   MOLUCCA SEA                  

P:  6APR2020 122985     3.0N  126.0E 4.0-5.6 ABAAA  Mindanao, Philippines      

 

An earthquake of M 4.7 was also felt in northern India today. NEIC reported intensity IV in Assam, India at Tezpur, Nagaon, and in Shilong, India and III in Rangapara, Itanagar, Gauhati and Sualkuchi, Assam, India. This is the strongest earthquake in the Assam, India area since an M 5.0 on February 8, 2020 and prior to that an M 4.7 on November 13, 2019. Forecast 123040 had expected today's event within about 50 km was likely around April 7. This epicenter is at 104 degrees from the M 6.5 in Idaho of March 31 and may have been promoted by energy from that source.

 

O:  5APR2020 17:50:30  26.5N   92.8E mb=4.7  EMSC   ASSAM, INDIA                 

P:  7APR2020 123040    26.0N   93.0E 4.0-5.5 AAAAA  Myanmar                    

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Mammoth Lakes, California area. NEIC reported intensity III-IV in Mammoth Lakes and northeast Fresno County and II-III within about 100 km at June Lake, Benton, Bishop, Shaver Lake, Oakhurst, Bass Lake and Yosemite. This may be related to the strong nor'easter which was simultaneous with the M 4.9 in Southern California yesterday. A pair of light earthquakes were also felt in the San Francisco area today with M 2.4 and 2.7. California may be heading into a period of high seismicity which generally lasts from mid-April to early May and can include moderate to strong quakes near the coast. Researchers have suggested this seasonal pattern may be related to weather, percolation and rainfall. The largest event in this period in the State was an M 8.3 in San Francisco in 1906. Weather was factor in that event, although not a strong nor'easter, weather maps from this date show a strong low pressure system over the area with winds to the northeast, typical of a nor'easter. While details cannot be found the strongest snowfall event in the northeastern U.S. occurred about a week before the San Francisco earthquake - for example, measuring 15 inches on April 10 in Portland, Maine, the largest snowfall in April ever recorded. This was probably part of a regional nor'easter. More directly associated with this northeastern U.S. weather event was an M 7.5, also on April 10, 1906 in the Gulf of California - a direct precursor to the San Francisco quake. A felt foreshock to that event occurred 10 hours after the Gulf of California event in San Francisco of unknown magnitude. Unusual local winds from the east were blowing when the earthquake occurred. These strange winds were one of the prime causes of the massive fire which followed the earthquake. A strong storm dumped inches of snow in the Mammoth Lakes region today and may have helped promote this unusual earthquake of M 4.4.

 

Another factor promoting seismicity in central and Southern California at this time were the events in Papua New Guinea of M 5.9-6.0 on March 27. This summary at the time had expected consequences in California as:

 

"Today's event (in Papua New Guinea) is the strongest event within about 200

km of this epicenter since an M 6.0 on January 18, 2020 and an M 6.1 on June 24, 2019. This earlier activity was followed about a 10-20 days later by a significant uptick in seismicity in Southern California - including the M 7.1 in Ridgecrest on July 6 2019. Similar increases may be seen in early April, 2020. Southern California is at 103 degrees from this epicenter in New Guinea and has been activated  by large quakes there on many occasions in the past." (March 27, 2020)

 

The M 3.9-4.4 in Mammoth Lakes, California today was the strongest in that area since an M 5.5 on December 28, 2016. An M 4.3-4.4 also occurred in the area February 1, 2020. This event had been expected at this time in forecast 123052.

This epicenter is at 102 degrees from the M 6.9 in the Eastern Turkey of January 24 and may have been promoted by energy from that source.

 

O: 05APR2020 19:20:46  37.5N  118.9W ML=4.4  ANSS   CENTRAL CALIFORNIA

O: 06APR2020 04:04:10  37.5N  118.9W Md=2.5  EMSC   CENTRAL CALIFORNIA

O:  5APR2020 19:20:45  37.5N  118.9W ML=3.9  EMSC   CENTRAL CALIFORNIA           

P:  5APR2020 123052    37.8N  118.2W 2.5-4.7 AAAAA  California/Nevada area     

P:  6APR2020 123052    38.2N  118.8W 2.5-4.6 AAAAA  California/Nevada area     

 

The strongest aftershock in Southern California today was an M 3.5. NEIC reported it and other lighter events was felt with intensity III in Southern California at Mountain View, Palm Desert, Indian Wells, Palm Springs, Rancho Mirage, Indio, Palm Desert, Cathedral City and other areas within about 100 km of the epicenter. Forecasts 123081 and 122841 had expected this activity in early April.

 

O:  5APR2020 21:18:59  32.9N  116.6W ML=2.2  EMSC   SOUTHERN CALIFORNIA          

O: 05APR2020 21:07:44  33.5N  116.5W mw=3.5  ANSS   15km ESE of Anza

O:  5APR2020 18:39:52  33.5N  116.5W ML=2.2  EMSC   SOUTHERN CALIFORNIA          

P:  7APR2020 123081    32.9N  116.6W 2.5-4.4 AAAAA  So. California             

P: 31MAR2020 122841    33.7N  116.1W 2.5-4.3 BAAAA  So. California             

 

An M 3.6-3.8 was felt in the Idaho aftershock zone. NEIC reported it was felt with intensity II-III within about 100 km of the epicenter. Reported shaking came from Idaho at Lowman, Stanley, Ketchum, Challis, Garden City, Boise, Hailey, and Midvale. Forecast 123110 had expected this activity was likely in the aftershock zone around April 5. Following is a listing of today's events of M>=3 in the area of Southern Idaho. A more complete listing is found in the Regional seismicity section below.

 

O: 05APR2020 15:47:55  44.3N  115.1W ML=3.1  EMSC   SOUTHERN IDAHO

O: 05APR2020 14:10:15  44.3N  115.2W ML=3.6  EMSC   SOUTHERN IDAHO

O: 05APR2020 14:10:15  44.3N  115.2W ML=3.8  ANSS   SOUTHERN IDAHO

O: 05APR2020 18:19:16  44.4N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

P:  5APR2020 123110    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

An aftershock northwest of the main aftershock zone in southern Puerto Rico occurred in the Mona Passage of Puerto Rico today with M 4.0-4.1.  Forecast 123032 had expected this activity around April 6. This epicenter is at 104 degrees from the M 7.7 in the Kurils of March 25 and may have been promoted by energy from that source.

 

O: 05APR2020 14:50:55  17.9N   66.8W ML=3.6  EMSC   PUERTO RICO REGION

O: 05APR2020 16:25:20  17.9N   66.8W ML=3.9  EMSC   PUERTO RICO REGION

O: 05APR2020 18:33:01  17.9N   66.8W Md=3.2  EMSC   PUERTO RICO REGION

O: 05APR2020 21:55:12  17.9N   66.9W Md=3.5  EMSC   PUERTO RICO REGION

O: 05APR2020 08:05:27  18.0N   67.0W Md=3.0  EMSC   PUERTO RICO

O: 05APR2020 14:03:37  18.1N   67.2W ML=3.0  EMSC   MONA PASSAGE, PUERTO RICO

O: 05APR2020 23:01:09  18.4N   67.4W Md=4.0  EMSC   MONA PASSAGE, PUERTO RICO

O: 05APR2020 23:01:09  18.4N   67.4W md=4.1  ANSS   Rincon Puerto Rico

O:  5APR2020 16:27:57  18.0N   66.9W ML=3.3  EMSC   PUERTO RICO                  

P:  6APR2020 123032    18.0N   67.0W 3.4-5.2 AAAAA  Puerto Rico                

 

SOUTHWEST PACIFIC SEES WEATHER-RELATED SEISMICITY

 

EARTHQUAKE SUMMARY FOR APRIL 4, 2020

 

The strongest seismicity in the world today occurred in the Southwest Pacific. The largest of these events was an M 5.3 in Tonga, but an M 5.0 in the Solomon Islands and an M 4.8 in the Santa Cruz Islands also occurred. The earthquake of M 5.3 in Tonga is the strongest in that region within about 200 km since an M 5.3 on March 12, 2020, the last such event with larger magnitude was an M 5.8 on February 28, 2020. Forecasts 123187 and 122944 had expected this area would see moderate activity in late March or early April.

 

O:  4APR2020 09:24:18  19.4S  173.3W mb=5.3  EMSC   TONGA                        

P:  6APR2020 123187    20.0S  175.0W 4.0-5.5 AABAA  Tonga Islands               

P: 31MAR2020 122944    18.0S  173.0W 4.0-5.4 BBAAA  Tonga Islands              

 

Both the M 5.0 in the Solomon Islands and the M 4.8 in the Santa Cruz Islands were probably promoted by stresses from tropical cyclone which are currently in  the area. This summary had noted on April 3 in regard to the Solomon Islands:

 

"A tropical cyclone may be forming in the southern Solomon Islands. This system is currently located at 10S 157E and tracking SE at 6 kts with winds up to 25 kts. Stresses associated with this storm may promote seismicity in the Solomon Islands and Vanuatu in the next several days." (April 3, 2020)

 

O:  4APR2020 12:11:22   7.4S  156.1E mb=5.0  EMSC   SOLOMON ISLANDS              

P:  9APR2020 123004     9.0S  157.0E 4.0-5.4 BBAAA  Solomon Islands            

 

Likewise in the previous issue of this summary it had been noted:

 

 

"TC Harold formed today in the region of Vanuatu with winds up to 135 kts. It is expected to track to the south and east over the next several days. Seismicity on the area of Vanuatu is likely to be enhanced while ths cyclone is in the region." (April 4, 2020)

 

TC Harold passed over the epicenter in the Santa Cruz Islands yesterday.

 

O:  4APR2020 08:22:05  11.0S  164.4E mb=4.8  EMSC   SANTA CRUZ ISLANDS REGION    

P:  4APR2020 123174    11.0S  165.0E 4.0-5.5 AAAAA  Vanuatu Islands            

 

Light and moderate aftershocks continued in Southern Idaho today. The strongest of these was an M 4.3 was felt with intensity II-III in Idaho at Stanley, Lowman, Garden Valley, Cascade, Idaho City, Horseshoe Bend, Donnelly, Garden City, Boise. Following is a listing of today's events of M>=3 in the area of Southern Idaho. A more complete listing is found in the Regional seismicity section below. Forecast 123110 had expected today's events around April 5.

 

O: 04APR2020 07:19:33  44.4N  115.2W ML=3.1  EMSC   SOUTHERN IDAHO

O: 04APR2020 16:29:34  44.4N  115.2W Ml=3.7  EMSC   SOUTHERN IDAHO

O: 04APR2020 15:41:12  44.5N  115.2W Ml=4.3  EMSC   SOUTHERN IDAHO

O: 04APR2020 15:49:04  44.5N  115.3W ML=3.2  EMSC   SOUTHERN IDAHO

O:  5APR2020 02:07:40  44.3N  115.0W ML=3.0  EMSC   SOUTHERN IDAHO               

P:  5APR2020 123110    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

Aftershocks also continued to be felt in the Salt Lake City, Utah area today. These included an M 2.7 felt with intensity II-III in Magna and Salt Lake City,  Utah. Forecast 123096 had expected today's activity was likely around April 5.

 

O:  4APR2020 08:49:04  40.7N  112.1W ML=2.7  EMSC   WASATCH FRONT URBAN AREA, UTAH

O:  4APR2020 14:17:31  40.7N  112.1W Ml=2.1  EMSC   WASATCH FRONT URBAN AREA, UTAH

P:  5APR2020 123096    40.3N  112.0W 2.0-4.0 AAAAA  Utah area                  

 

 

Aftershocks also continued in Southern California following the M 4.9 there yesterday. The largest of today's events was of M 2.4, 2.5 and 2.6. These are small aftershocks, but the region often sees moderate aftershocks following an event of this size so the aftershock series is likely to be enhanced from this level in the next several days. Forecast 123081 had expected activity within about 50 km of today's activity was likely around April 7.

 

NEIC reported the earthquake of M 2.5 in Southern California  was felt with intensity II-III in the area(s) of Southern California at Palm Desert, La Quinta, Borrego Springs, Desert Hot Springs, Julian (IV), Murieta, Visa, San Marcos, Moreno Valley and San Diego.

 

O: 04APR2020 11:49:17  33.5N  116.5W ML=2.6  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 23:34:47  33.5N  116.5W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 12:11:19  33.5N  116.5W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 05APR2020 03:21:58  33.5N  116.5W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 12:54:24  33.5N  116.5W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 08:59:57  33.5N  116.5W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 18:34:02  33.5N  116.5W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 12:18:10  33.5N  116.5W Ml=2.4  EMSC   SOUTHERN CALIFORNIA

O:  4APR2020 18:54:38  33.5N  116.5W Ml=2.5  EMSC   SOUTHERN CALIFORNIA          

P:  7APR2020 123081    32.9N  116.6W 2.5-4.4 BAAAA  So. California             

 

An unusual earthquake of M 4.3 occurred today in Egypt.  This is the strongest earthquake within about 200 km of this epicenter since an M 4.4 on November 29, 2016 about 100 km south of today's epicenter. An M 5.2 hit within about 25 km of today's epicenter on June 27, 2015. When this earthquake occurred this summary noted:

 

"The last earthquake within 250 km of this epicenter of M>=5.2 occurred on  May 10, 1997 with M 5.3. An earthquake of M 7.2 hit about 50 km south of this epicenter on November 22, 1995." (June 28, 2015)

 

Forecast 123048 had expected regional activity to the north in Syria where

a moderate quake occurred yesterday. This was expected in early April.

 

O:  5APR2020 05:04:07  29.0N   34.9E ML=4.3  EMSC   EGYPT                        

P:  4APR2020 123048    35.0N   35.0E 3.0-4.5 ACAAA  Aegean Sea                 

 

MODERATE QUAKE SHAKES SOUTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR APRIL 3, 2020

 

A moderate earthquake of M 4.9-5.0 shook regions southeast of Los Angeles, California today. It was reported by NEIC to have been felt with intensity IV throughout a large portion of Southern California including at Mountain Center, Anza, Palm Desert, Ranchita, Warner Springs, La Quinta, Palm Springs, Aguanga, Indian Wells, Rancho Mirage. More than 20,000 people reported to NEIC that they had felt this event which occurred in the local evening. It was reported felt as far as 1000 km from the epicenter. This is the strongest earthquake within about 100 km of this epicenter since an M 5.2 on June 10, 2016 and prior to that an M 5.5 on August 26, 2012. A strong M 7.2 earthquake rocked the area south of this ten years ago on April 4, 2010 on Easter Sunday (see history section below). The earthquake occurred in the desert regions southeast of Los Angeles and no major damage was reported from this epicentral region. The timing of today's event appears to have been promoted by several factors including plate motions induced by a storm off the northeast U.S., the strongest geomagnetic storm in nearly half a year and its relation to the Kuril Islands M 7.7 of March 25. In the previous summary it had been noted:

 

 

"Seismicity in California, Oregon and Washington was at low levels today. Some regional triggering in southern California is likely following the M 6.5 in  Idaho. The full moon on April 8 may reduce the likelihood of a moderate quake from April 6-10 but seismicity could be enhanced in the next three days in  the area due to an unusual reverse air flow and storm pattern in the Northeast U.S over the past three days. Harmonic resonance is likely at this time in the North American Plate, partly due to this weather pattern." (April 2-3, 2020)

 

The weather pattern referred to is a nor-easter which this summary has repeatedly tied to significant seismic activity in the western U.S. Winds with speeds up to 70 m/h were recorded as the storm battered areas from New Jersey to Nova Scotia and Maine. Instead of the typical winds from the west, a low gets situated off the northeast coast and due to a combination of factors does not immediately move to the northwest. Winds shift to the north and east (hence nor-easter) and can be substantial. These winds push North America to the west affecting plate motions differently than the prevailing westerlies. In addition to strong precipitation events (the current storm dropped up to 5 inches of rain in three days) this can lead to promotion of seismicity in the west.

 

The geomagnetic storm was also described in previous issues as it related to the M 6.5 in Idaho as:

 

 

"Today's earthquake in Idaho coincided with the strongest disturbance in the geomagnetic field since late October, 2019 as noted in this summary:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 15.  High latitude geomagnetic field saw active conditions  with AP at 25. This is the strongest disturbance in the geomagnetic field since AP reached 26 on October 26, 2019. Moderate disturbance in the geomagnetic field such as today's can help promote enhanced seismicity especially at high latitudes." (March 31, April 1, 2020)

 

This summary has long been an advocate of seismic promotion from both nor-easter type storms and geomagnetic triggering.

 

Another factor which probably promoted the event in Southern California at this time was the series of events to the north in Idaho (M 6.5 March 31) and the Salt Lake City  (M 5.6, March 18); and the Kuril Islands M 7.7 (M 7.7 March 25). In particular today's event is located near the 6th node from the Kurils (60 degrees). This summary had expected seismic promotion in southern California at this time from the Kurils in previous issues as:

 

 

"Moderate far-field triggering is likely following the earthquake in the Kuril Islands. ... at 60 degrees Central Indonesia and southern California. These areas may see enhanced seismicity in coming days." (March 24-25, 2020)

 

A series of earthquakes in Central Indonesia at the 6th and 7th node has been followed since then in this summary. This appears to be the latest in this nodal triggering from the major Kuril Islands event.

 

Following is a listing of aftershocks of M>=3.0 today in the region of Southern

California. A more complete listing can be found in the Regional California section below. Forecast 122841 had expected today's activity within about 50 km of these epicenter was likely at the end of March or in early April. This activity is at 104 degrees from the M 6.8 in Eastern Turkey of January 24 and near the sixth node (60 degrees) from the Kuril Islands M 7.7 and may have been promoted by energy from those events.

 

O: 04APR2020 01:53:18  33.5N  116.5W Mw=4.9  ANSS   SOUTHERN CALIFORNIA

O: 04APR2020 01:53:20  33.2N  116.3W Mw=4.9  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 01:55:35  33.5N  116.5W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 02:59:22  33.5N  116.5W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 05:12:34  33.5N  116.5W ML=3.5  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 01:54:22  33.5N  116.5W ML=3.8  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 02:04:59  33.5N  116.5W ML=3.8  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 04:07:21  33.5N  116.5W Mw=3.6  EMSC   SOUTHERN CALIFORNIA

P: 31MAR2020 122841    33.7N  116.1W 2.5-4.3 BAAAA  So. California             

 

The strongest earthquakes in the world today continued in the activation of the South Sandwich Islands and in the antipodal area of the Komandorsky Islands of

Russia. These included an M 5.4 in the Komandorsky and a second in the South Sandwich Islands along with an M 5.1. This activity was not reported felt in these remote areas. The M 5.4 in the South Sandwich Islands is the largest since the activation began following the M 7.7 near the antipode in the Kuril Islands of March 25. The last event of larger magnitude in the South Sandwich Islands was an M 6.1 on January 20, 2020. Forecast 123202 had expected today's South Sandwich activity in early April. 

 

O:  4APR2020 01:52:49  55.9S   27.8W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  7APR2020 123202    55.0S   28.0W 4.0-6.1 BAAAA  So. Sandwich Islands       

 

O:  3APR2020 22:50:46  58.7S   25.2W Mw=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  4APR2020 123202    60.0S   26.0W 4.0-6.0 ABAAA  So. Sandwich Islands       

 

The M 5.4 in the Komandorsky Islands is the strongest within about 200 km in that region since an M 5.7 on June 27, 2019 following events of M 6.3 and 6.4 on

June 25 and 26. These occurred about 200 km northwest of today's epicenter and were aftershocks of an M 7.3 on December 20, 2018. Forecast 123137 had expected today's event within about 25 km of this epicenter was likely in early April.

 

O:  4APR2020 06:18:27  54.9N  166.2E Mw=5.4  EMSC   KOMANDORSKIYE OSTROVA REGION 

P:  7APR2020 123137    55.0N  166.0E 4.0-5.8 BAAAA  Komandorsky Isl            

 

An unusual earthquake off the coast of Syria of M 4.6 also occurred today. NEIC reported maximum shaking in Syria at Tartus,  Banias, Misiaf, Hama, and Jubayl, Juniyah, and Babda, Lebanon with II-III in This is the strongest event within about 200 km in Syria since an M 5.0 on July 29, 2015. Forecast 123048 had expected today's event within about 100 km was likely around April 4.

 

O:  4APR2020 03:41:53  35.7N   35.6E ML=2.6  EMSC   NEAR THE COAST OF SYRIA      

O:  3APR2020 18:15:42  35.8N   35.6E ML=4.8  EMSC   NEAR THE COAST OF SYRIA      

P:  4APR2020 123048    35.0N   35.0E 3.0-4.5 AAAAA  Aegean Sea                 

 

Aftershocks also continued to be felt in southern Idaho today. The strongest  of today events were two of M 4.3 felt with intensity II-III in Idaho at Stanley, Lowman, Garden Valley, Cascade, Idaho City, Horseshoe Bend, Donnelly, Garden City, Boise. Following is a listing of today's events of M>=3 in the area of Southern Idaho. A more complete listing is found in the Regional seismicity section below. Forecast 123110 had expected today's events around April 5.

       

O: 03APR2020 16:10:23  44.3N  115.1W Ml=3.8  EMSC   SOUTHERN IDAHO

O: 03APR2020 21:57:24  44.3N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 03APR2020 20:21:47  44.3N  115.2W Ml=4.3  EMSC   SOUTHERN IDAHO

O: 03APR2020 15:44:29  44.4N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 04APR2020 04:36:08  44.4N  115.2W ML=3.1  EMSC   SOUTHERN IDAHO

O: 03APR2020 12:48:15  44.4N  115.2W ML=3.2  EMSC   SOUTHERN IDAHO

O: 03APR2020 07:54:48  44.4N  115.2W ML=3.5  EMSC   SOUTHERN IDAHO

O: 03APR2020 12:15:35  44.4N  115.2W ML=3.5  EMSC   SOUTHERN IDAHO

O: 03APR2020 08:32:31  44.4N  115.2W ML=3.6  EMSC   SOUTHERN IDAHO

O: 03APR2020 19:30:19  44.4N  115.2W Ml=3.0  EMSC   SOUTHERN IDAHO

O: 03APR2020 20:06:24  44.4N  115.2W Ml=4.3  EMSC   SOUTHERN IDAHO

O:  4APR2020 01:46:10  44.5N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO               

P:  5APR2020 123110    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

MODERATE SEISMICITY DOMINATES

 

EARTHQUAKE SUMMARY FOR APRIL 2, 2020

 

The strongest earthquakes in the world today were moderate events of M 4.7-5.2.

These included an M 4.7 in Eastern Turkey; an M 5.1 in the South Sandwich Islands, off the coast of Nicaragua, Central America (M 5.2); the northern Mariana Islands, (M 5.2); and an M 5.2 in the Banda Sea, Indonesia. Most of these were in remote areas and were not reported felt.

 

The earthquake in Eastern Turkey is the strongest in the area within about 150 km of that epicenter since an M 6.0 on February 23, 2020 and may be a regional aftershock of that event about 150 km southeast of today's epicenter. Forecasts 122852 and 123094 had expected this activity within about 100 km was likely

in late March or early April.

 

NEIC reported this earthquake of M 4.7 in Eastern Turkey  was felt with intensity II-III in the area(s) of Eastern Turkey at Acara and  Bayrut, Lebanon, and in Gazientep, Turkey. 

 

O:  3APR2020 05:44:25  38.9N   43.5E Mw=4.7  EMSC   EASTERN TURKEY               

P:  4APR2020 123094    38.0N   43.0E 3.5-5.1 AAAAA  Turkey                     

P: 31MAR2020 122852    39.0N   41.0E 3.5-4.8 AABAA  Turkey                     

 

O:  2APR2020 10:15:40  11.8N   88.4W Mw=5.2  EMSC   OFF COAST OF CENTRAL AMERICA 

P: 31MAR2020 122772    13.0N   89.0W 3.5-5.0 ABAAA  Coast of Central America   

 

O:  2APR2020 20:09:07  20.6N  144.8E mb=5.2  EMSC   MAUG ISLANDS REG, N. MARIANA I

P:  3APR2020 123046    22.0N  145.0E 4.0-5.5 ABAAA  Volcano Islands            

P: 26MAR2020 122805    22.0N  144.0E 4.0-5.4 CBAAA  Volcano Islands            

 

O:  2APR2020 21:42:41   7.0S  126.6E Mw=5.2  EMSC   BANDA SEA                    

P: 30MAR2020 122747     7.0S  125.0E 4.0-5.3 AABAA  Banda Sea                  

 

The South Sandwich Islands have been active since the M 7.7 in the Kuril Islands of March 25. They lie near the antipode of that event and are subject to antipodal seismic enhancement at this time.

 

O:  2APR2020 18:43:37  56.2S   27.3W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  5APR2020 123202    56.0S   26.0W 4.0-5.8 BAAAA  So. Sandwich Islands       

P: 27MAR2020 122976    56.0S   28.0W 4.0-5.6 BAAAA  So. Sandwich Islands       

 

Aftershocks continued in southern Idaho today. The strongest was an M 4.2 which NEIC reported was felt in Idaho at Middleton with intensity V; and New Plymouth with IV. Lesser shaking of II-III was reported from Meridian, Garden City, Lowman and Stanley, Idaho. Following is a list of events of M>=3 in southern Idaho today following the M 6.5 of March 31. A more complete listing is found in the regional seismicity section below. Forecast 123110 had expected this activity was likely in early April.

 

O: 03APR2020 04:22:43  44.2N  115.1W ML=3.0  EMSC   SOUTHERN IDAHO

O: 03APR2020 01:45:39  44.2N  115.1W ML=3.2  EMSC   SOUTHERN IDAHO

O: 03APR2020 04:00:52  44.2N  115.1W ML=3.2  EMSC   SOUTHERN IDAHO

O: 03APR2020 04:41:48  44.2N  115.1W ML=3.3  EMSC   SOUTHERN IDAHO

O: 02APR2020 23:16:19  44.2N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 02APR2020 13:51:55  44.3N  115.1W Ml=3.4  EMSC   SOUTHERN IDAHO

O: 02APR2020 23:46:33  44.3N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 02APR2020 18:16:55  44.3N  115.2W Ml=3.2  EMSC   SOUTHERN IDAHO

O: 02APR2020 18:25:36  44.3N  115.2W Ml=3.2  EMSC   SOUTHERN IDAHO

O: 02APR2020 13:54:26  44.3N  115.2W Ml=3.5  EMSC   SOUTHERN IDAHO

O: 02APR2020 20:17:53  44.4N  115.1W ML=3.1  EMSC   SOUTHERN IDAHO

O: 03APR2020 02:26:07  44.4N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 02APR2020 11:12:55  44.4N  115.2W Ml=3.5  EMSC   SOUTHERN IDAHO

O: 02APR2020 12:22:42  44.4N  115.2W Ml=3.5  EMSC   SOUTHERN IDAHO

O: 02APR2020 11:01:17  44.4N  115.2W Ml=3.7  EMSC   SOUTHERN IDAHO

O: 02APR2020 14:19:45  44.4N  115.2W Ml=3.7  EMSC   SOUTHERN IDAHO

O: 03APR2020 05:34:36  44.4N  115.2W Ml=4.0  EMSC   SOUTHERN IDAHO

O: 02APR2020 20:45:01  44.4N  115.2W Ml=4.2  EMSC   SOUTHERN IDAHO

O: 02APR2020 10:35:06  44.5N  115.2W ML=3.1  EMSC   SOUTHERN IDAHO

O: 02APR2020 21:45:23  44.5N  115.2W ML=3.2  EMSC   SOUTHERN IDAHO

O: 02APR2020 22:39:54  44.5N  115.2W ML=3.2  EMSC   SOUTHERN IDAHO

O: 02APR2020 19:59:28  44.5N  115.2W Ml=3.0  EMSC   SOUTHERN IDAHO

O: 02APR2020 21:24:20  44.5N  115.2W Ml=3.2  EMSC   SOUTHERN IDAHO

O: 02APR2020 13:09:37  44.5N  115.2W Ml=3.5  EMSC   SOUTHERN IDAHO

O: 02APR2020 18:56:02  44.5N  115.2W Ml=3.5  EMSC   SOUTHERN IDAHO

P:  5APR2020 123110    44.4N  115.1W 2.0-4.1 BAAAA  Montana/Idaho              

 

The largest event in the U.S. or Canada outside Idaho today was an M 3.5 which was not felt in the Fox Islands epicentral zone. The last event within about 200 km of this epicenter in the Fox Islands of M>3.5 was an M 5.0 on January 13, 2020. This may be an aftershock of that earthquake. Activity in this area had been expected around April 4 about 50 km to the east.

 

O:  3APR2020 06:44:57  52.6N  170.6W ml=3.5  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  4APR2020 123135    52.4N  169.4W 3.5-5.1 AAAAA  Fox Islands, Aleutians     

 

Seismicity in California, Oregon and Washington was at low levels today. Some regional triggering in southern California is likely following the M 6.5 in  Idaho. The full moon on April 8 may reduce the likelihood of a moderate quake from April 6-10 but seismicity could be enhanced in the next three days in  the area due to an unusual reverse air flow and storm pattern in the Northeast U.S. over the past three days. Harmonic resonance is likely at this time in the North American Plate, partly due to this weather pattern.

 

M 5.5 IN ALOR, INDONESIA

 

EARTHQUAKE SUMMARY FOR APRIL 1, 2020

 

The largest earthquake in the world today was an M 5.5 in the region of East Timor, Indonesia. NEIC reported it was felt with intensity III in Dili, East Timor. BMG reported it was felt with intensity II-III in Alor, Indonesia. This is the strongest earthquake within about 200 km of this epicenter since an M 6.3 on April 6, 2019 and prior to that an M 5.6 on July 7, 2016.  Forecasts 122747 and 122752 had expected today's activity at the end of March or early in April was likely within this area.

 

O:  2APR2020 02:13:14   8.0S  125.7E Mw=5.5  EMSC   KEPULAUAN BARAT DAYA, INDONESI

P: 30MAR2020 122747     7.0S  125.0E 4.0-5.3 AAAAA  Banda Sea                  

P: 30MAR2020 122752     9.0S  124.0E 4.0-5.3 AABAA  Flores Island area         

 

An unusually large M 4.8 occurred in the Comoros Islands north of Madagascar today. NEIC reported it was felt in Madagascar at Pemba Cabo Delgado about 60 km south of the epicenter. An M 3.2 also occurred today in the Mayotte region north of Madagascar. The last earthquake with M>=4.8 in the region of Mozambique within about 100 km of today's event was an M 5.0 on February 13, 2012. Forecast 122936 had expected today's activity was likely at the end of March. This activity is located at 144 degrees from the M 6.5 in Idaho of March 31. This is a distance at which energy from large surface events concentrates from those events and may help trigger additional events. In the previous issue this summary had noted this possibility as:

 

"While today's earthquake (in Idaho) is not quite large enough for significant far-field triggering, it is instructive to identify areas where such triggering is most likely. The 103 degree distance passes through Taiwan, the Cook Strait, New Zealand, New Guinea, Northern Philippines Northern India and Afghanistan and Iran, the Pacific-Antarctic Ridge and Southern Chile. Regions near 144 degrees from Idaho Include the southern Indian Ocean and South Africa and Mayotte." (April 1, 2020)

 

O:  1APR2020 06:21:40  12.8S   45.4E ML=3.2  EMSC   MAYOTTE REGION               

P: 26MAR2020 122936    12.0S   45.0E 3.0-4.3 BAAAA  Mayotte    area            

 

O:  1APR2020 22:18:12  13.1S   41.0E mb=4.8  EMSC   MOZAMBIQUE                   

P: 26MAR2020 122936    12.0S   45.0E 3.0-4.3 CBCAA  Mayotte    area            

P: 28MAR2020 122936    18.0S   42.0E 3.0-4.3 BCAAA  Madagascar area            

 

Aftershocks of the M 6.5 yesterday in southern Idaho continued to be felt today. The strongest of these was an M 4.4. NEIC reported it was felt with maximum intensity V in Idaho at Emmett and IV in Ketchum, Eagle, and Hailey with II-III shaking within about 100 km of the epicenter reported from Boise, Garden City, McCall, Cascade and Lowman. Following is a listing of aftershocks of M>=3 in the area today. Forecast 122871 had expected today's activity was likely around April 1.

 

O: 02APR2020 05:54:19  44.2N  115.1W ML=3.0  EMSC   SOUTHERN IDAHO

O: 01APR2020 09:49:31  44.3N  115.1W ML=3.1  EMSC   SOUTHERN IDAHO

O: 01APR2020 16:01:40  44.3N  115.1W ML=3.4  EMSC   SOUTHERN IDAHO

O: 01APR2020 15:35:16  44.3N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 01APR2020 10:57:37  44.3N  115.2W Ml=4.2  EMSC   SOUTHERN IDAHO

O: 01APR2020 12:35:46  44.3N  115.3W ML=3.0  EMSC   SOUTHERN IDAHO

O: 01APR2020 13:28:27  44.3N  115.3W ML=3.2  EMSC   SOUTHERN IDAHO

O: 01APR2020 10:39:29  44.4N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 01APR2020 12:17:51  44.4N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 01APR2020 19:55:47  44.4N  115.2W ML=3.1  EMSC   SOUTHERN IDAHO

O: 01APR2020 07:42:25  44.4N  115.2W ML=3.2  EMSC   SOUTHERN IDAHO

O: 01APR2020 10:33:40  44.4N  115.2W ML=3.2  EMSC   SOUTHERN IDAHO

O: 01APR2020 08:48:03  44.4N  115.2W ML=3.4  EMSC   SOUTHERN IDAHO

O: 02APR2020 05:28:07  44.4N  115.2W ML=3.4  EMSC   SOUTHERN IDAHO

O: 01APR2020 20:49:12  44.4N  115.2W ML=3.6  EMSC   SOUTHERN IDAHO

O: 01APR2020 19:38:24  44.4N  115.2W Ml=3.2  EMSC   SOUTHERN IDAHO

O: 01APR2020 19:40:19  44.4N  115.2W Ml=3.8  EMSC   SOUTHERN IDAHO

O: 01APR2020 13:30:09  44.4N  115.2W Ml=4.4  EMSC   SOUTHERN IDAHO

O: 01APR2020 17:51:05  44.5N  115.2W ML=3.1  EMSC   SOUTHERN IDAHO

O: 01APR2020 12:40:12  44.5N  115.2W Ml=3.4  EMSC   SOUTHERN IDAHO

O: 01APR2020 21:03:20  44.5N  115.2W Ml=4.1  EMSC   SOUTHERN IDAHO

P:  1APR2020 122871    44.5N  116.2W 2.0-3.8 AAAAA  Montana/Idaho              

 

 

Aftershocks also continued in southern Puerto Rico today. These events were felt in the region of Ponce and San Juan with light shaking. The strongest of today's aftershocks was of M 3.4. Forecast 122785 had expected this activity at the end of March.

 

O:  2APR2020 02:50:12  19.3N   66.6W Md=3.4  EMSC   PUERTO RICO REGION           

P: 29MAR2020 122785    19.0N   66.0W 3.4-4.8 BAAAA  Puerto Rico                

 

The largest earthquake in the U.S. or Canada today was an M 4.9 in the Andreanof Islands, Alaska. This is an active area and the last event in the region of M>=4.9 occurred March 23, 2020 with M 4.9 and prior to that on March 3 with M 5.1. Forecast 122898 had expected today's event was likely around March 31.

 

O:  1APR2020 09:32:47  51.4N  178.3W mb=4.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 31MAR2020 122898    51.0N  179.9W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians