UNUSUAL EARTHQUAKE IN FALKLAND ISLANDS

 

EARTHQUAKE SUMMARY FOR DECEMBER 7, 2018

 

 

It was a relatively quiet day in global seismicity. Many of the recent aftershock sequences did not produce notable events today. The most unusual earthquake of the day was an M 4.9 in the Falkland Islandsd region. The last earthquake within about 300 km of this epicenter with M>=4.9 in the Falkland Islands was an M 4.9 on August 11, 2002. The last within about 1000 km of larger size was an M 5.3 on February 27, 2014.

 

O:  8DEC2018 05:24:34  54.1S   58.7W mb=4.9  EMSC   FALKLAND ISLANDS REGION      

 

The strongest activity continued in the Loyalty Islands aftershock sequence with for moderate aftershock including an M 5.0 and 5.1. Forecast 121918 had expected this activity was likely around December 5. Neither of today's events was reported felt in the epicentral region.

 

O:  7DEC2018 20:43:55  21.9S  169.2E mb=4.9  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O:  7DEC2018 11:14:48  21.9S  170.2E mb=5.0  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O:  8DEC2018 02:57:23  22.0S  169.3E mb=5.1  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O:  7DEC2018 09:22:13  22.4S  169.7E mb=4.8  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P:  5DEC2018 121918    23.0S  169.0E 4.0-5.6 AAAAA  Loyalty Islands            

 

An earthquake of M 4.5-4.7 occurred in the Dominican Republic today. This continues NEIC reported this earthquake of M  4.7 in the Dominican Republic was felt with intensity II-III in the area(s) of the Dominican Republic at Otra Banda. Bayamon, Puerto Rico and Culebra, Puerto Rico. a series of minor earthquakes in the area over the past month which may precede a strong regional quake. The last such quake was an M 4.4 on November 11, 2018 and prior to that an M 4.0 on August 24, 2018 within about 100 km of today's epicenter. Forecast 121758 had expected this activity around December 11.

 

O:  8DEC2018 04:07:27  18.8N   69.0W Md=3.2  EMSC   DOMINICAN REPUBLIC           

O:  8DEC2018 00:59:35  19.1N   68.1W Md=3.1  EMSC   DOMINICAN REPUBLIC REGION    

O:  8DEC2018 01:14:51  19.1N   68.1W Md=3.1  EMSC   DOMINICAN REPUBLIC REGION    

O:  7DEC2018 18:25:47  19.5N   68.0W mb=4.5  EMSC   DOMINICAN REPUBLIC REGION    

O:  7DEC2018 18:25:47  19.5N   68.0W mb=4.7  ANSS   DOMINICAN REPUBLIC REGION    

P: 11DEC2018 121758    20.0N   68.0W 3.0-4.6 BAAAA  Bahamas/No. Caribbean      

 

Aftershocks in the Anchorage, Alaska continued today but at a further reduced rate. The strongest of these was an M 3.7 but only six events of M>=3 were recorded in the area today. Most were felt lightly in the Anchorage, Alaska region. Forecasts 121886 and 121884 had expected this activity around December 8-9.

 

O:  7DEC2018 19:54:53  61.3N  150.0W ML=3.7  EMSC   SOUTHERN ALASKA              

O:  7DEC2018 21:35:10  61.4N  150.0W ML=3.4  EMSC   SOUTHERN ALASKA              

O:  7DEC2018 12:53:16  61.4N  150.1W Ml=3.4  EMSC   SOUTHERN ALASKA              

O:  7DEC2018 22:24:55  61.5N  150.0W ML=2.5  EMSC   SOUTHERN ALASKA              

aO:  7DEC2018 22:45:07  61.5N  150.0W ML=3.0  EMSC   SOUTHERN ALASKA              

O:  8DEC2018 06:11:50  61.5N  150.0W ML=3.4  EMSC   SOUTHERN ALASKA              

P:  6DEC2018 121886    61.1N  150.2W 3.2-5.0 AAAAA  Central Alaska             

P:  8DEC2018 121884    60.9N  151.1W 3.2-5.2 AAAAA  Central Alaska             

P:  9DEC2018 121886    61.3N  150.9W 3.2-5.3 AAAAA  Central Alaska             

 

The largest earthquake in the U.S. or Canada today, however did not occur in the Anchorage swarm but in the aftershock sequcen in Northern Alaska which began in  August 2018. This event of M 4.4. The last quake in this area of M>=4.4 occurred  September 18, 2018 with M 5.1. Forecast 121891 had expected today's event was likely around December 8.

 

O:  7DEC2018 15:22:56  69.8N  145.0W mb=4.4  EMSC   NORTHERN ALASKA              

P:  8DEC2018 121891    69.0N  144.0W 3.0-4.6 AAAAA  Northern Alaska            

 

 

AFTERSHOCKS CONTINUE IN LOTALTY ISLANDS; ALASKA

 

EARTHQUAKE SUMMARY FOR DECEMBER 6, 2018

 

 

The strongest earthquakes in the world today continued in the aftershock sequence in the Loyalty and New Caledonia Islands. These follow the mainshock of M 7.5 of December 5. The strongest today was an M 5.7 which occurred near local solar noon. It was nearly sub-solar as the new moon arrived and was probably promoted by energy from that tidal event as noted in previous issues of this summary:

 

"The new moon will arrive at 07:20 UT on December 7, 2018. Longitudes which are antisolar at this time are near 110 West while those sub-solar are near 70 East longitude. These longitude zones will experience the most tidal stresses possibly leading to moderate to strong triggered seismicity. In the west they include areas of western North America and the East Pacific Rise; in the east they include central Asia and portions of the Indian Ocean Ridge. Tidal promotion of seismicity however is not limited to these regions and may occur in areas near rupture. Watch for events occurring near local solar midnight and noon for possible targets of tidal triggering." (December 3-7, 2018)

 

Forecast 121918 had expected this activity in the Loyalty Islands was likely between December 5 and 9, 2018.

 

O:  7DEC2018 04:26:28  21.8S  169.1E mb=5.0  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O: 06DEC2018 23:26:59  22.4S  169.6E mw=5.7  ANSS   Tadine New Caledonia

O:  6DEC2018 23:26:59  22.3S  169.7E Mw=5.7  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O:  6DEC2018 18:34:26  22.4S  169.4E mb=4.9  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O:  6DEC2018 17:55:28  22.6S  169.6E mb=4.9  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O:  6DEC2018 18:07:29  22.7S  169.8E mb=5.0  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O:  6DEC2018 17:32:40  23.0S  168.8E mb=5.0  EMSC   NEW CALEDONIA                

O:  7DEC2018 00:09:32  23.2S  166.0E mb=4.6  EMSC   NEW CALEDONIA                

P:  5DEC2018 121918    23.0S  169.0E 4.0-5.6 AAAAA  Loyalty Islands            

P:  9DEC2018 121918    21.0S  169.0E 4.0-5.6 AAAAA  Loyalty Islands            

 

 

The strongest earthquakes in the U.S. or Canada today continued in the Anchorage, Alaska region as aftershocks of the M 7.0 of November 30, 2018. The largest today were M 4.7 and 4.1. These were felt with moderate intensity in the region of Southern Alaska around Anchorage. The sequence contained 7 events of M>=3 today and continued the decline noted in the past several days. Forecast 121886 had expected this activity around December 6.

 

O:  6DEC2018 18:08:06  61.3N  150.0W Ml=3.0  EMSC   SOUTHERN ALASKA              

O:  6DEC2018 14:28:07  61.4N  150.0W Ml=3.5  EMSC   SOUTHERN ALASKA              

O:  6DEC2018 21:45:09  61.4N  150.0W Mw=4.7  EMSC   SOUTHERN ALASKA              

O:  7DEC2018 05:58:14  61.4N  150.1W Ml=3.0  EMSC   SOUTHERN ALASKA              

O:  6DEC2018 21:46:21  61.5N  150.0W ML=4.1  EMSC   SOUTHERN ALASKA              

O:  6DEC2018 23:41:05  61.5N  150.1W ML=3.2  EMSC   SOUTHERN ALASKA              

O:  6DEC2018 16:53:20  61.5N  150.1W Ml=3.3  EMSC   SOUTHERN ALASKA              

P:  6DEC2018 121886    61.1N  150.2W 3.2-5.0 AAAAA  Central Alaska             

 

MODERATELY LARGE QUAKES IN LOMBOK, INDONESIA; CENTRAL CHILE

 

EARTHQUAKE SUMMARY FOR DECEMBER 5, 2018

 

A moderately large earthquake of M 5.5 occurred in Central Chile near Valpariso today. NEIC reported maximum shaking of intensity V in San Antonio, Quilpue, Vina del Mar, and Lampa with lesser shaking within about 100 km of the epicenter reported from Penaflor, Valparaiso, Villa Alemana, San Bernardo, Lampa and Santiago, Chile. This activity is located at 100-103 degrees from the Loyalty Islands where an M 7.6 occurred yesterday and an M 6.7 followed today. This is a distance at which strong triggering of seismicity can occur from concentrated refracted and reflected seismic energy off the core-mantle boundary and the Chile quakes were probably promoted from the Loyalty Islands. Other activity at this distance from the Loyalty Islands today in Peru, Chiapas, Mexico, Oklahoma, and Kyrgyzstan among others. The last earthquake within about 200 km of this epicenter with M>5.5 occurred as an M 5.8 on September 18, 2017. A slightly smaller shock about 100 km to the southwest hit the area on December 1, 2018. Forecast 121929 had expected  in Peru, Chiapas, Mexico, Oklahoma, and Kyrgyzstan among others

 

GUC reported this earthquake was felt with intensity VI in  Valparaiso at Llaillay, V Villa Alemana, Zapallar, Valparaiso, San Felipe, Quillota, Los Andes, Limache, Calera, IV La Ligua, San Antonio, ; in Coquimbo at Salamaca with III; in Santiago with V in Colina, San Bernardo, Talagante; IV in Melipilla, Puente Alto and Santiago; O'Higgins V at Graneros, Machali, IV in Chimbarongo, Codegua, Coinco, Coltauco, Donihue, Las Catras, Malloa, Mostazal, Navidad, Olivar, Rancagua, Rengo and San Fernando and in Maule III in Constitucion, Curico, Romeral, Sangrada Familia, San Javier and Talca and II in Rio Claro, Chile.

 

O:  5DEC2018 17:12:14  33.7S   71.5W mb=5.5  EMSC   VALPARAISO, CHILE            

O:  5DEC2018 17:12     33.7S   71.5W mb=5.2  GUC    Valparaiso at Llaillay, V Vill

P:  3DEC2018 121929    33.0S   70.0W 4.0-5.4 AAAAA  Central Chile              

P:  7DEC2018 121929    33.0S   72.0W 4.0-5.4 AAAAA  Central Chile              

 

A moderately strong aftershock also shook the region of Lombok, Indonesia today with M 5.5 NEIC reported this earthquake of M 5.5 in Lombok, Indonesia was felt with intensity IV in Mataram, Karangasem and II-III in the area(s) of Klungkung, Ubud Bali, Denpasar, Kula, Tabanan and Singaraja, Bali, Indonesia.  BMG reported it was felt with intensity VI in Lombok, V in Mataram; III-IV Denpasar;  III Jimbaran, Tabanan, Sumbawa, II Nusa Dua and II-III in Karangasem, Kuta and Singaraja, Indonesia. This is the strongest aftershock in the region since the immediate aftershock sequence of August 5, 19 and 25 which included events of M 6.9-7.0. The mainshock killed thousands and generated a strong tsunami with was also deadly. Forecasts 121728 and 121918 had expected a moderate aftershock in the Lombok area between December 4 and 8. This epicenter is located at 100 degrees from the M 7.0 in Alaska of November 30.

 

O: 06DEC2018 01:02:45  08.4S  116.1E MS=5.7  BMG  Felt with intensity VI

O:  6DEC2018 01:02:45   8.4S  116.1E Mw=5.5  EMSC   LOMBOK REGION, INDONESIA     

P:  4DEC2018 121728     9.0S  118.0E 4.0-5.6 AABAA  Sumbawa Island area        

P:  8DEC2018 121910    10.0S  116.0E 4.0-5.4 ABAAA  Sumbawa Island area        

 

A moderate earthquake of M 4.2 occurred today in Southern California east of Los Angeles in the area of Trona, California. NEIC reported it was felt with intensity IV in Trona and II-III within about 100 km of the epicenter in Ridgecrest, Fort Irwin, Shoshone, Death Valley, Inyokem, CanfilNEIC reported an aftershock of M 3.7 in Southern California was felt with intensity V in Trona, California and II-III in the area(s) of Baker, Pahrump, Victorville California and in Las Vegas, Nevada.  NEIC reported an aftershock of M 3.7 in Southern California was felt with intensity V in Trona, California and II-III in the area(s) of Baker, Pahrump, Victorville California and in Las Vegas, Nevada.  The last earthquake of M>=4.2 to hit within about 75 km of this epicenter near Trona, California was an M 4.4 on March 13, 2014. An M 4.1 occurred about 25 km northeast of today's epicenter on August 22, 2017.  Forecasts 121772 and 121813 had expected activity in the area around December 6-8. This epicenter is located at the fourth node (90 degrees) from the Loyalty Islands and was probably promoted from that source. The fourth node from the Loyalty Islands has seen increased seismicity in the past day.

 

O:  5DEC2018 22:10:06  35.7N  117.1W ML=3.9  EMSC   SOUTHERN CALIFORNIA          

O:  5DEC2018 21:40:16  35.7N  117.1W Mw=4.1  EMSC   SOUTHERN CALIFORNIA          

O:  5DEC2018 21:40:16  35.7N  117.1W Mw=4.2  ANSS   SOUTHERN CALIFORNIA          

P:  6DEC2018 121772    36.2N  117.9W 2.5-4.5 AAAAA  California/Nevada area     

P:  8DEC2018 121813    35.9N  117.7W 2.5-4.6 BAAAA  So. California             

 

An unusual swarm of events in Northern California with maximum magnitude M 3.0 also occurred at the fourth node (90 degrees) from the Loyalty Islands today. The last earthquake within about 50 km of this epicenter with M>=3.0 was an M 3.4 on February 11, 2018. Forecast 121848 had expected today's activity around December 9.

 

NEIC reported this earthquake of M 3.0 in Northern California was felt with intensity II-III in the area(s) of Crescent Mills, and Quincy, California.

 

O: 05DEC2018 11:56:37  40.0N  120.8W ml=2.3  EMSC   NORTHERN CALIFORNIA

O: 05DEC2018 12:16:00  40.0N  120.8W ml=2.3  EMSC   NORTHERN CALIFORNIA

O: 05DEC2018 12:32:28  40.0N  120.8W ml=2.4  EMSC   NORTHERN CALIFORNIA

O: 06DEC2018 00:25:12  40.0N  120.8W ml=2.5  EMSC   NORTHERN CALIFORNIA

O: 06DEC2018 03:25:25  40.0N  120.8W ml=2.9  EMSC   NORTHERN CALIFORNIA

O: 06DEC2018 03:25:25  40.0N  120.8W ml=3.0  ANSS   NORTHERN CALIFORNIA

O:  5DEC2018 12:07:19  40.0N  120.8W ml=2.0  EMSC   NORTHERN CALIFORNIA          

P:  9DEC2018 121848    40.3N  121.2W 2.5-4.6 BAAAA  Northern California        

 

Aftershocks in the Anchorage, Alaska area continued to be felt lightly in the region today. The largest of these was an M 4.7 which was felt with moderate intensity in the Anchorage area. Only six aftershocks of M>=3 were recorded today as the aftershock sequence continues to decline. The rapid decline in aftershock events may be related to the cold ground temperatures which inhibit further ruptures. Forecast 121886 had expected today's activity in the Anchorage area within about 25 km of these epicenters.

 

O: 06DEC2018 02:19:41  61.3N  150.0W ML=3.4  EMSC   SOUTHERN ALASKA

O: 05DEC2018 16:04:38  61.3N  150.1W Ml=3.2  EMSC   SOUTHERN ALASKA

O: 05DEC2018 12:48:43  61.3N  150.1W mb=4.7  EMSC   SOUTHERN ALASKA

O: 06DEC2018 04:58:35  61.4N  149.9W ML=3.3  EMSC   SOUTHERN ALASKA

O: 05DEC2018 13:14:58  61.5N  149.9W ML=3.0  EMSC   SOUTHERN ALASKA

O:  6DEC2018 02:22:35  61.5N  150.1W ML=3.0  EMSC   SOUTHERN ALASKA              

P:  6DEC2018 121886    61.1N  150.2W 3.2-5.0 AAAAA  Central Alaska             

 

There appeared to be some migration of the epicenters in the Anchorage area today. An M 3.9 occurred about 200 km to the east in Southern Alaska far from the aftershock zone. The last event of M>=3.9 within about 150 km of this epicenter was an M 4.3 on October 16, 2018. Stress redistribution after the Anchorage quake probably helped promote today's event to the east. The area may be near a stronger quake. Forecast 121885 had expected an event in this area was likely around December 8.

 

O:  5DEC2018 18:41:36  61.6N  146.4W mb=3.9  EMSC   SOUTHERN ALASKA               

P:  8DEC2018 121885    60.9N  147.4W 3.2-5.1 BAAAA  Central Alaska             

 

Local authorities in Hawaii declared the Volcanic eruptions of this summer over. No volcanism associated with this eruption has occurred since August, 2018.

 

MAJOR EARTHQUAKE STRIKES NEW CALEDONIA/LOYALTY ISLANDS

 

EARTHQUAKE SUMMARY FOR DECEMBER 4, 2018

 

An M 7.6 earthquake hit the region of New Caledonia and the Loyalty Islands today. It was followed by a strong series of aftershocks. NEIC reported the mainshock was felt with intensity II-III in New Caledonia at Yate, Mont-Dore, Noumea, Houailia, Caledonia and in Vila Shefa, Vanuatu and possibly in Brisbane, Queensland, Australia. These aftershocks included an M 6.7; 6.0 and two of M 5.9 in the first several hours.

 

The activity in the Loyalty Islands is located at 90 degrees (node 4) from the Anchorage, Alaska quake. This node can be strongly activated where epicenters at at right angles. The last large quake in the world - an M 6.3 in the Banda Sea, Indonesia was also at 90 degrees from Alaska as noted at the time in this summary:

 

"The strongest earthquake of the day was an M 6.3 in the Banda Sea, Indonesia. NEIC reported it was felt with intensity V in Dili, East Timor; and II-III in Los Palos Lautem, EAst Timor and in Northern Territory, Australia at Darwin, Howard Springs, Hempt Doo-McMinns Lagoon and Nhulumbuy, Australia. Intermediate

depth, strong earthquakes in the Banda Sea are often felt in Northern Territory, Australia. ... This event is located near the fourth node (90 degrees) from Alaska and may have been promoted from that source. It occurred at the height of the geomagnetic storm near the geomagnetic equator and was also probably enhanced be effects from that." (December 2, 2018)

 

The last earthquakes of M>=7.5 in the Loyalty Islands occurred 20 years ago on  January 4, 1998 with M 7.5. The only other such event in the past 30 years was an  M 7.7 on May 16, 1995. A foreshock of M 6.4 hit the area on October 16, 2018. The last moderately large event in the region was an M 5.8 on November 27, 2018. Forecasts 121927, 121918 and 121665 had expected this activity  in the Loyalty Islands around December 4-5.

 

Like the earthquake of October 15, today's activity was probably promoted by tidal effects associated with the new moon. This summary noted this effect on October 15, 2018 as:

 

 

"A series of strong earthquakes including those of M 6.5, 6.3 and 6.0 among others occurred at local solar noon today. They were nearly sub-solar at the time of their occurrence, a time when tidal stresses from the sun are maximized and were probably triggered by these tidal stresses.

 

The last earthquake in the Loyalty Islands with M>=6.6 within about 250 km of today's epicenters occurred on August 29, 2018 with M 7.1. Today's earthquakes are probably aftershocks of that event. An M 7.0 also hit the region on November 19, 2017. Forecast 120645 had expected today's activity within about 50 km of these events was likely around October 20. These epicenters are at the seventh node  (51-52 degrees) from recent large earthquakes in Sulawesi and Lombok, Indonesia including the M 7.5 in Sulawesi of September 28 which is known to have killed more than 1000 people and may have been promoted from those sources." (October 16, 2018)

 

 

O: 05DEC2018 04:28:44  21.5S  169.4E mb=5.9  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 05DEC2018 06:51:45  21.8S  169.2E mb=4.9  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 05DEC2018 04:30:24  21.8S  169.2E mb=5.9  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 05DEC2018 04:50:20  21.8S  169.3E mb=5.3  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 05DEC2018 04:41:56  21.8S  169.3E mb=5.7  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 05DEC2018 06:43:08  21.8S  169.8E Mw=6.7  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 05DEC2018 04:18:07  21.9S  169.5E Mw=7.5  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 05DEC2018 04:14:40  22.0S  169.4E mb=6.0  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 05DEC2018 05:53:05  22.1S  169.7E mb=5.2  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 05DEC2018 04:54:24  22.2S  169.8E mb=5.2  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O:  5DEC2018 06:36:56  22.3S  168.7E mb=4.9  EMSC   NEW CALEDONIA                

P:  4DEC2018 121927    20.0S  169.0E 4.0-5.5 ABAAA  Vanuatu Islands            

P:  5DEC2018 121918    23.0S  169.0E 4.0-5.6 AAAAA  Loyalty Islands            

P: 29NOV2018 121665    23.0S  169.0E 4.0-5.8 CAAAA  Loyalty Islands            

 

Earthquakes in Indonesia at 101-103 degrees from the M 7.0 near Anchorage, Alaska of November 30 continued today with a swarm of moderate events in the Nias area and moderate quakes in the Sunda Strait and south of Java, Indonesia. This should continue for several more days with the possibility of a larger quake after that.

 

The aftershock sequence in the Anchorage, Alaska continued to decline today. The strongest of today's eight earthquakes of M>=3 were lightly felt in the Anchorage, Alaska region. The largest of these was an M 4.1. Forecasts 121886 had expected this activity was likely around December 6.

 

O: 05DEC2018 00:46:00  61.3N  150.0W ML=3.8  EMSC   SOUTHERN ALASKA

O: 04DEC2018 23:35:23  61.4N  150.0W ML=3.0  EMSC   SOUTHERN ALASKA

O: 04DEC2018 09:27:33  61.4N  150.1W ML=3.5  EMSC   SOUTHERN ALASKA

O: 05DEC2018 01:46:25  61.5N  149.9W ML=3.0  EMSC   SOUTHERN ALASKA

O: 04DEC2018 08:29:12  61.5N  149.9W ML=4.1  EMSC   SOUTHERN ALASKA

O: 05DEC2018 00:02:54  61.5N  150.0W ML=3.3  EMSC   SOUTHERN ALASKA

O: 05DEC2018 06:13:19  61.5N  150.0W Ml=3.2  EMSC   SOUTHERN ALASKA

O:  4DEC2018 22:49:01  61.5N  150.1W ML=3.2  EMSC   SOUTHERN ALASKA               

P:  6DEC2018 121886    61.1N  150.2W 3.2-5.0 AAAAA  Central Alaska             

 

The most unusual earthquakes in the California region of North America today occurred in the northern Gulf of California with M 4.1 and 4.2. Epicenters to the northwest of this by about 50 km are not uncommon, and often associated with new and full moons, but today's epicenter is not common. The last event within about 50 km of today's epicenter with M>=4.2 was an M 4.2 on October 4, 2013. Today's epicenters are located at 90 degrees (node 4) from the Loyalty Islands (as with the distance between the Loyalty Islands and Alaska) and may have been precursory to those events. Forecast 121804  had expected this activity in early December.  

 

O:  5DEC2018 01:32:02  29.6N  113.9W ML=4.2  EMSC   GULF OF CALIFORNIA           

O:  4DEC2018 23:42:42  29.7N  113.6W ML=4.1  EMSC   GULF OF CALIFORNIA           

P: 11DEC2018 121804    30.2N  114.1W 2.0-3.9 CAAAA  SW U.S.A                   

 

STRONG PROMOTION IN INDOMESIA FROM ANCHORAGE, ALASKA

 

EARTHQUAKE SUMMARY FOR DECEMBER 3, 2018

 

Active conditions were again observed today in the region of Indonesia. Series of moderate earthquakes have occurred in this region in the Nias area and in the Sunda Strait since the Anchorage, Alaska earthquake. These prior swarms have been located at 102-103 degrees from the Anchorage epicenter. After strong earthquakes seismic energy is reflected and refracted off core-mantle boundaries and returns in a concentrated form to the surface at this distance range. This can be additionally promoted by geomagnetic effect when a storm is in progress as it currently is. A series of three moderate and lesser events occurred today in the area south of Java, Indonesia with M 4.1, 4.5, and 4.6. The last quake of M>4.6 within about 100 km of these epicenter was an M 5.5 on July 19, 2018 about 100 km east of today's epicenters.  Like the previous swarms in the Sunda Strait and Nias, the distance of today's Java quakes is 103 degrees from the Anchorage, Alaska mainshock. This strongly suggests promotion from that source. Another area at 103 degrees from Anchorage, Alaska is southern Peru and northern Chile in the Atacama area. Moderate to strong enhancement of seismicity is also possible in this region. Forecast 121658 had expected this activity at the end of November or in early December. These epicenters are located near the geomagnetic equator. Expected seismic promotion from this storm had been expected in this summary as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 10. High latitude geomagnetic field also saw disturbed conditions  with AP at 21. This moderate geomagnetic storm may help to encourage seismicity near the geomagnetic equator and at high latitudes through December 7.  This is the strongest geomagnetic storm at high latitudes since November 1, 2018 when AP reached 35." (December 2-3, 2018)

 

O:  3DEC2018 19:18:03   9.7S  111.8E ML=4.6  EMSC   SOUTH OF JAVA, INDONESIA     

O:  4DEC2018 02:14:57   9.8S  111.8E ML=4.5  EMSC   SOUTH OF JAVA, INDONESIA     

O:  4DEC2018 01:27:48  10.2S  111.7E ML=4.1  EMSC   SOUTH OF JAVA, INDONESIA     

P: 29NOV2018 121658    10.0S  109.0E 4.0-5.5 BABAA  So. of Java                

 

The strongest earthquake in North America today was an M 4.6-4.7 in Eastern Greenland. It occurred within about an hour of local solar noon and may have been promoted by tidal stresses which maximize at this hour. This is not an active epicenter, as no earthquakes of M>=4.7 have been recorded within about 300 km in the past 30 years. The last event of M>=4 also occurred more than 30 years ago.

 

O:  3DEC2018 14:41:47  68.2N   30.3W mb=4.7  EMSC   EASTERN GREENLAND            

 

The aftershock sequence of the November 30, 2018 event near Anchorage Alaska of M 7.0 continued its rapid decline in intensity today. Many of the dozen events of M>=3 were felt lightly in Anchorage and vicinity. Only one event of M>=4 was recorded in this sequence today - an M 4.0. Forecast 121630 among others had expected this activity in late November or early December.

 

O: 03DEC2018 07:40:45  61.3N  150.1W Ml=3.2  EMSC   SOUTHERN ALASKA

O: 04DEC2018 02:33:28  61.4N  150.0W ML=3.0  EMSC   SOUTHERN ALASKA

O: 03DEC2018 06:51:01  61.4N  150.0W Ml=3.5  EMSC   SOUTHERN ALASKA

O: 03DEC2018 20:39:58  61.4N  150.0W Ml=3.6  EMSC   SOUTHERN ALASKA

O: 03DEC2018 20:30:11  61.4N  150.1W Ml=3.1  EMSC   SOUTHERN ALASKA

O: 03DEC2018 14:52:50  61.4N  150.1W Ml=3.2  EMSC   SOUTHERN ALASKA

O: 03DEC2018 20:41:06  61.5N  149.9W Ml=3.3  EMSC   SOUTHERN ALASKA

O: 03DEC2018 10:30:35  61.5N  150.0W ML=3.5  EMSC   SOUTHERN ALASKA

O: 03DEC2018 12:18:58  61.5N  150.0W ML=4.0  EMSC   SOUTHERN ALASKA

O: 03DEC2018 19:27:51  61.5N  150.0W Ml=3.5  EMSC   SOUTHERN ALASKA

O: 03DEC2018 18:22:43  61.5N  150.1W Ml=3.2  EMSC   SOUTHERN ALASKA

O: 03DEC2018 06:52:12  61.5N  150.1W Ml=3.5  EMSC   SOUTHERN ALASKA

O:  3DEC2018 20:22:35  61.3N  150.0W Ml=3.4  EMSC   SOUTHERN ALASKA              

P: 27NOV2018 121630    61.0N  151.4W 3.2-5.2 CAAAA  Central Alaska             

 

ACTIVITY ANTIPODAL TO ALASKA

 

EARTHQUAKE SUMMARY FOR DECEMBER 2, 2018

 

The strongest earthquakes of the day were a pair of events of M 5.4 south of Africa. This area is near-antipodal to the M 7.0 near Anchorage, Alaska of November 30 and may have been activated by energy from that event. Because of the near-spherical shape of the earth, energy travelling on the surface focuses on the antipode, the point directly opposite the site of the earthquake. Ground motions at the antipode can reach levels similar to that 500 km from the epicenter and can help promote seismicity.  These events are also at 101-104 degrees from the great Fiji earthquakes of August and September where seismic energy is also concentrated following strong quakes. Other activity occurring today at this distance from Fiji included event in Missouri, northern Chile and  Peru. The last earthquake within about 250 km of today's epicenters which surpassed M 5.4 was an M 5.4 on October 23, 2017 more than a year ago. The last of larger magnitude was an M 5.9 on October 23, 2017 as well.  Forecast 121692 expected this activity within about 100 km of these epicenters was likely around December 1. The second African event occurred within minutes of local solar midnight, a time when tidal stresses are maximized and may have been affected by these stresses.

 

O:  2DEC2018 23:13:53  52.6S   18.0E mb=5.4  EMSC   SOUTHWEST OF AFRICA          

O:  2DEC2018 15:05:00  54.8S   18.4E Mw=5.4  EMSC   SOUTHWEST OF AFRICA          

P:  1DEC2018 121692    53.0S   19.0E 4.0-5.4 AAAAA  Atlantic-Indian Ridge      

 

At least one earthquake in Alaska - an M 3.7 in the Alaska Peninsula occurred within about 100 km of the true antipode of the events south of Africa (Compare 54S and 54N and 18.4E and 160.8W for antipodality.

 

O:  3DEC2018 02:09:39  54.2N  160.8W mb=3.7  EMSC   ALASKA PENINSULA             

P: 30NOV2018 121608    54.8N  158.7W 3.5-4.9 BABAA  Alaska Peninsula           

 

Aftershocks continued near Anchorage, Alaska today where they were lightly felt in the region of Anchorage, Elmendorf AFB and surroundings with intensity II-V. The aftershock sequence is rapidly declining, however with only one event of M>=4 registered today. Following is a listing of events of M>=3.5 today, those of M>=3 can be found under the "ALASKA" section of this summary. There is some indication the aftershocks are migrating to the north. Far-field activity continued in Chiapas, Mexico at the sixth node from Alaska (60 degrees) and in  the Sunda Strait, Indonesia (103 degrees). Forecasts 121628-121631 had expected this activity at the end of November into early December, 2018.

 

O: 02DEC2018 14:18:03  61.4N  149.9W ML=3.7  EMSC   SOUTHERN ALASKA

O: 02DEC2018 22:25:14  61.4N  150.0W ML=3.5  EMSC   SOUTHERN ALASKA

O: 03DEC2018 06:51:01  61.4N  150.0W Ml=3.5  EMSC   SOUTHERN ALASKA

O: 03DEC2018 02:35:35  61.5N  150.0W mb=4.5  EMSC   SOUTHERN ALASKA

O:  3DEC2018 06:52:12  61.5N  150.1W Ml=3.5  EMSC   SOUTHERN ALASKA              

P: 28NOV2018 121628    60.1N  150.6W 3.2-5.0 BBAAA  Central Alaska             

P: 28NOV2018 121631    62.7N  149.3W 3.2-4.9 BBAAA  Central Alaska             

 

The largest earthquake in the U.S. or Canada was not an aftershock near Anchorage. It was an M 4.6 in the western Andreanof Islands, Aleutians, Alaska. This area has been active since the Anchorage event and may be close to a large earthquake. Some evidence for this is that outer rise quakes in the area have been recently occurring. The last event in the area within about 150 km of this epicenter with M>=4.6 was an 4,8 on November 29, 2018. Forecast 121618 expected this event within about 50 km was likely towards the end of November or in early December.

 

O:  2DEC2018 19:06:48  51.4N  178.2W mb=4.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 26NOV2018 121610    51.6N  177.6W 3.5-5.0 CAAAA  Andreanoff Isls, Aleutians 

 

A minor earthquake off the northeast coast of Canada  near Resolution Island occurred today with M 3.3 The was the largest earthquake in Canada or the U.S. today excluding Alaska and British Columbia. The last earthquake within about 200 km of this epicenter in the North Atlantic with M>=3.3 according to NEIC was an M 5.2 on September 6, 2008. Today's epicenter is at the same latitude (60.9N) as the earthquake near Anchorage, Alaska and may have been promoted by energy from that event. Forecast 121626 had expected today's activity within about 25 km at the end of November.

 

O:  2DEC2018 01:40:06  60.9N   58.3W ML=3.3  NRCA  356 km E from Resolution Island

P: 28NOV2018 121626    61.0N   58.0W 2.5-3.9 BAAAA  Baffin/Davis Strait Canada 

 

 

 

 

 

STRONG EARTHQUAKES IN INDONESIA; CHILE FOLLOW ALASKA

 

EARTHQUAKE SUMMARY FOR DECEMBER 1, 2018

 

Moderate to strong seismicity followed yesterday's event in Anchorage, Alaska in Central Chile (M 5.5) and in the Banda Sea, Indonesia (M 6.5). These were probably promoted by energy from the Alaska earthquake. The most active area of the world was Indonesia where a strong quake occurred in the Banda Sea as well as series of moderate quakes in Nias and the Sunda Strait.

 

"The geomagnetic field saw disturbed conditions today. The AP level was 12. High latitude geomagnetic field also saw disturbed conditions  with AP at 15. This moderate geomagnetic storm may help to encourage seismicity near the geomagnetic equator and at high latitudes through December 7. The M 6.3 in the Banda Sea on  the geomagnetic equator occurred as this storm was beginning and reached Kp 5 at about 09-12 UT. This is the strongest geomagnetic storm since November 10, 2018 when AP reached 13." (December 1-2, 2018)

 

The strongest earthquake of the day was an M 6.3 in the Banda Sea, Indonesia. NEIC reported it was felt with intensity V in Dili, East Timor; and II-III in Los Palos Lautem, East Timor and in Northern Territory, Australia at Darwin, Howard Springs, Humpty Doo-McMinns Lagoon and Nhulumbuy, Australia. Intermediate

depth, strong earthquakes in the Banda Sea are often felt in Northern Territory, Australia. March 25, 2018 with M 6.4 and prior to that an M 6.7 on December 21, 2016. An earthquake of M 6.4 also occurred in the Banda Sea exactly five years ago on December 1, 2013. Forecast 121445 had expected today's activity in the Banda Sea at the end of November. This event is located near the fourth node (90 degrees) from Alaska and may have been promoted from that source. It occurred at the height of the geomagnetic storm near the geomagnetic equator and was also probably enhanced be effects from that.

 

O:  1DEC2018 13:27:20   7.4S  128.7E Mw=6.3  EMSC   KEPULAUAN BARAT DAYA, INDONESI

O:  2DEC2018 04:46:24   7.5S  128.8E mb=4.1  EMSC   KEPULAUAN BARAT DAYA, INDONESI

P: 26NOV2018 121445     8.0S  129.0E 4.0-5.7 CAAAA  Banda Sea                  

P: 29NOV2018 121445     6.0S  129.0E 4.0-5.5 BBAAA  Banda Sea                  

 

Elsewhere a series of moderate earthquakes hit the Sunda Strait and Nias, Indonesia. The events in the Sunda Strait are located at 103 degrees from the epicenter in Alaska while thos in the Nias area are at 101 degrees from that location. Seismic energy from large earthquakes is reflected and refracted off the core-mantle boundary and returns to the surface in the distance range 100-104 degrees and can help encourage seismic activity at this distance. These events are located near the geomagnetic equator and may also have been promoted by the new geomagnetic storm. Forecasts 121460 and 121461 had anticipated the Sunda Strait activity within about 100 km while forecast 121442 expected the activity in Nias, at the end of November.

 

O:  1DEC2018 15:26:34   0.1N   97.0E ML=4.4  EMSC   NIAS REGION, INDONESIA       

O:  1DEC2018 15:23:13   0.2N   97.0E ML=4.2  EMSC   NIAS REGION, INDONESIA       

O:  1DEC2018 18:14:53   0.3N   97.1E mb=4.6  EMSC   NIAS REGION, INDONESIA       

P: 27NOV2018 121442     0.0N   99.0E 4.0-5.5 BABAA  So. Sumatera               

 

O:  1DEC2018 22:36:10   6.8S  105.0E mb=4.8  EMSC   SUNDA STRAIT, INDONESIA      

O:  1DEC2018 07:14:18   6.9S  105.1E ML=4.2  EMSC   SUNDA STRAIT, INDONESIA      

O:  2DEC2018 00:48:38   6.9S  105.1E ML=4.3  EMSC   SUNDA STRAIT, INDONESIA      

P: 26NOV2018 121460     7.0S  106.0E 4.0-5.7 CAAAA  So. of Java                

P: 26NOV2018 121461     6.0S  104.0E 4.0-5.4 CAAAA  So. of Sumatera            

 

 

The earthquake in Chile in O'Higgins of M 5.5 was reported by NEIC to have been felt with intensity VII in Chile at Valparaiso and II-III in San Antonio, Quilpue, Vina del Mar, Villa Alemana, Curico and Santiago, Chile. GUC reported this earthquake was felt with intensity IV in  Valparaiso at Cartegena, El Quisco, El Tabo, San Antonio, Santo Domingo, III in Valparaiso, Vina del Mar, II in Algarrobo and Villa Alemana; in Santiago with III in San Pedro, and II in Curacavi; in O'Higgins with V in Litueche, Navidad, La Estrella; IV in Pardones and III in Marchihue, Nancagua, Placilla, San Fernando, Santa Cruz; in Maule with IV in Rauco, Romeral; III in Curico, Rio Claro, Sagrada Familia and San Rafael; II in Constitucion, Pencahue, Chile. This is the strongest earthquake within about 200 km of this epicenter since an M 5.8 on April 28, 2017. Forecasts 121676 and 121677 had expected this activity in this region at the end of November.

 

O:  1DEC2018 23:59:19  33.9S   72.4W ML=4.3  EMSC   OFFSHORE O'HIGGINS, CHILE    

O:  1DEC2018 23:55:23  33.9S   72.4W Mw=5.6  EMSC   OFFSHORE O'HIGGINS, CHILE    

O:  1DEC2018 23:55     33.9S   72.5W mb=5.4  GUC    Valparaiso at Cartegena, El Qu

P: 28NOV2018 121676    33.0S   69.0W 4.0-5.6 BABAA  Central Chile              

P: 28NOV2018 121677    35.0S   71.0W 4.0-5.7 BBAAA  Central Chile              

 

Moderate to moderately strong aftershocks continued in the region near Anchorage, Alaska today. These follow the M 7.0  in that area which did considerable damage to roads and bridges yesterday. Some of these were felt with intensity V in Anchorage and II-IV in Elmendorf, Fort Richardson, Wasilla, Willow, Chugiak, Eagle River, Indian, Girdwood, Kenai, Sterling, Palmer, Soldotna, Kasilof and Valdez, Alaska. The following list of events in the area of M>=4 is complemented by a list of events of M>=3 in the "ALASKA" section below. Forecasts 121630-121633 had expected this activity was likely around November 27.

 

O: 02DEC2018 04:52:15  61.3N  150.0W Mw=4.3  EMSC   SOUTHERN ALASKA

O: 01DEC2018 22:42:01  61.3N  150.1W Mw=4.0  EMSC   SOUTHERN ALASKA

O: 01DEC2018 16:01:06  61.3N  150.1W mb=4.2  EMSC   SOUTHERN ALASKA

O: 01DEC2018 07:57:21  61.4N  150.0W Mw=5.0  EMSC   SOUTHERN ALASKA

O: 01DEC2018 07:07:33  61.4N  150.1W mb=5.2  EMSC   SOUTHERN ALASKA

O: 01DEC2018 16:04:58  61.5N  149.9W mb=4.2  EMSC   SOUTHERN ALASKA

P: 27NOV2018 121630    61.0N  151.4W 3.2-5.2 BAAAA  Central Alaska             

P: 27NOV2018 121633    62.8N  149.1W 3.2-5.0 BBAAA  Central Alaska             

 

A far-field aftershock of M 4.7 in the Vancouver Island region of Canada was lightly felt in that region. It occurred near local solar midnight and may have been enhanced by tidal effects which maximize near this hour. It is the strongest earthquake in the Vancouver Island region since a series on October 22, 2018 which included events of M 6.6, 6.8 and 6.5 among others.   Forecast 121611 had expected this earthquake within about 50 km was likely around November 28.

 

O:  1DEC2018 07:33:48  50.1N  129.4W mb=4.8  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 28NOV2018 121611    50.2N  129.8W 3.0-5.1 BAAAA  British Colombia           

 

 

MAJOR EARTHQUAKE STRIKES SOUTHERN ALASKA

 

EARTHQUAKE SUMMARY FOR NOVEMBER 30, 2018

 

A major earthquake of M 7.0 occurred near Anchorage, Alaska today. No deaths or tsunami were reported with the quake but much damage to infrastructure occurred. The area has seen a continuing series of moderate to strong earthquakes over the past several months and, as a high latitude quake, was part of the activation of high latitude seismicity seen over the past two week. The year 2018 has been very active for Alaska. A great earthquake of M 7.9 hit the Gulf of Alaska on January 23, 2018. This was followed by an M 6.4 and series in northern Alaska beginning on August 12, 2018 and an M 6.6 on August 15, 2018 in the Andreanof Islands. The last regional earthquake with M>=7 within about 300 km of today's epicenter was an M 7.1 on January 24, 2016 about 300 km to the southwest at intermediate focus which prevented damage on January 24, 2016. This summary at the time noted activity in Nebraska and other unusual seismicity as precursory to this event. Interested readers are urged to revisit that and other summaries for more information.

 

The current activation of seismicity at high latitudes began in mid-November as noted in this summary and continued through late November. The initial activation was noted as:

 

"A series of strong earthquakes hit high latitudes today in Antarctic-Pacific Ridge; and the South Sandwich Islands (M 6.3-6.4). These were joined by enhanced high-latitude seismicity off the coast of Oregon, Idaho and the Ionian Sea among others. These were accompanied by an M 6.2 in Kamchatka yesterday and by an M 6.3 in the Solomon Islands today near the geomagnetic equator. When the earth is bombarded from particles from CME on the sun, many of these follow magnetic lines towards the northern and southern geomagnetic poles. They  can be seen in high latitude visual displays such as the northern lights and enhance ring currents in the ionosphere. This, in turn can help promote seismicity in high and low latitudes zones. This had been anticipated in the prior summaries" (November 16, 2018)

 

A new geomagnetic storm may begin today and will help to shape the aftershocks in Alaska.

 

NEIC reported the mainshock of M 7.0 was felt with damage with intensity VIII in Eagle River, VII in Willow, Trapper Creek, Chugiak, Anchorage, Talkeetna, Sterling, Palmer, Denali National Park, Elmendorf AFB, Anchorage, Light intensity shaking with intensity II-III was reported as far as 1000 km from the epicenter with intensity IV-V as far as 500 km from the epicenter including at Fairbanks and Kodiak. Many aftershocks were reported felt with intensity as high as VI, especially in the Anchorage, Chugiak, Elmendorf AFB, Fort Richardson, and Wasilla areas of Southern Alaska. Initial reports indicate no one was killed in this earthquake. Roads and other infrastructure was not as lucky however, Pictures on the internet show buckled highways in the region. Highways into and out of Anchorage were closed and gas lines were ruptured. Power was out to many. There was damage to roads and bridges but no major structural collapses of buildings were reported. Portions of the Glenn Highway disappeared. Seiche was observed. Because of wintry conditions, most of the repair work will have to wait till spring.

 

A regional foreshock about 150 km north of the mainshock was reported felt with intensity II-III in Talkeetna and Valdez about three hours before the mainshock. Creaking foreshocks, which are fairly typical of quakes of this size in Alaska occurred in Idaho and off the Coast of Oregon minutes before the Alaskan quake. The Idaho quake was M 3.0 and was felt with intensity II-III in Afton and possibly in McCammon and Buhl, Idaho and Montana. A series of events, including an M 3.8 hit about 50 km west of today's epicenter in Idaho in mid-November. At the time this summary considered this part of the high latitude activation.  Forecasts 121560 and 121606 had expected this activity in late November.

 

O: 30NOV2018 17:35:37  40.0N  111.5W Ml=3.2  EMSC   UTAH                         

P: 30NOV2018 121560    39.7N  110.8W 2.0-3.9 AAAAA  Utah area                  

 

O: 30NOV2018 16:34:36  42.7N  111.1W ML=3.1  EMSC   SOUTHERN IDAHO               

P: 26NOV2018 121606    43.2N  111.0W 2.0-3.9 BAAAA  Yellowstone/Wyoming        

 

The M 4.2 off the coast of Oregon about an hour before the Alaskan mainshock was reported by NEIC to have been felt along the Oregon coast in Grants Pass, Portland and Brothers, Oregon and possibly in Vancouver, Canada. An M 4.7 in the Vancouver, Canada area occurred later in the day. The event in Vancouver is located at 103 degrees from Minahasa and may have been promoted from that source.

 

O: 30NOV2018 15:53:11  44.0N  128.8W mb=4.2  EMSC   OFF COAST OF OREGON          

P: 23NOV2018 121592    44.1N  128.8W 3.0-4.4 CAAAA  Off Coast of Oregon        

P: 28NOV2018 121592    44.5N  129.8W 3.0-4.7 AAAAA  Off Coast of Oregon        

 

A pair of M 2.2 creaking quakes also preceded the Alaska quake in Montana.

 

O: 30NOV2018 13:51:16  47.4N  112.9W Ml=2.2  EMSC   WESTERN MONTANA              

O: 30NOV2018 18:29:11  47.4N  112.9W Ml=2.2  EMSC   WESTERN MONTANA              

P: 30NOV2018 121607    45.6N  111.9W 2.0-4.1 ABAAA  Yellowstone/Wyoming        

 

These are part of a long-standing observation of small to moderate quakes in the western U.S. and Canada which often precede by hour or days major earthquakes in

Alaska. This has been previously noted on many occasions in this summary.

 

Following is a listing of the aftershocks and mainshock of M>=4. A more complete listing can be found in the "ALASKA" section below with M>=3. The last earthquake within about 200 km of this epicenter near Anchorage, Alaska with M>=7.0 occurred on March 28, 1964 (M 9.3) - the Good Friday Earthquake. Other such events hit the region November 3, 1943 (M 7,3); May 4, 1934 (M 7.2); April 27, 1933 (M 7.1); January 31, 1912 (M 7.2); September 19, 1909 (M 7.4) and July 14, 1899 (M 7.2). The series of events from 1933 through 1949 suggests more such event are likely in the years to come. The last event of M>=5.0 within about 150 km of this epicenter was an M 5.0 on July 19, 2018. A foreshock appears to have occurred with M 4.5 on October 15, 2018 within the confines of today's epicenter. A week ago an M 5.7 about 200 km southwest of today's epicenter may have signaled today's event. This summary had noted at the time of the October 15, 2018 event:

 

"A moderate earthquake of M 4.5 in Southern Alaska also occurred today near Anchorage. NEIC reported it was felt lightly with intensity II-III in Anchorage, Willow, Elmendorf AFB, Fort Richards, Wasilla, Kenai, Eagle River, Chugiak, Tyonek, Sterling, Girdwood, Cooper Landing, Soldotna, Talkeetna, Kasilof, Seward and Palmer and in general within about 150 km of the epicenter. The last earthquake near Anchorage within about 150 km of this epicenter with M>=4.5

 

Likewise after the M 5.7 in Southern Alaska November 21 this report noted:

 

"A moderately strong earthquake of M 5.5-5.7 occurred in Southern Alaska today near Redoubt Volcano. It was widely felt with maximum intensity IV in Anchor Point, Alaska and II-III in Alaska at Ninilchik, Clam Gulch, Kasilof, Homer, Soldotna, Levelock, Sterling, Kenai, Cooper Landing, Anchorage, Seward, Elmendorf, Willow, Fort Richardson, Girdwood, Wasilla, Eagle River, Kodiak, Chugiak, Talkeetna, Palmer, Valdez, and possibly Fairbanks, Alaska.

The intermediate focus of this hypocenter at 145 km probably prevented damage and greater shaking in the area...

 

In addition to an M 4.8, the largest in the region of northern Idaho in more than 30 years which occurred yesterday, a pair of light earthquakes today in western Canada preceded the event in Alaska. These were an M 3.3 in the Sachs Harbor and an M 3.7 in the area near Mould Bay. It is not uncommon for a regional activation with significant earthquakes in the Rocky Mountains to precede unusual earthquakes in Alaska and this may be another example of this type of precursory behavior." (November 21-22, 2018)

 

The description of the 1964 event in this summary's history section for March 28 shows the extent of that damage as well as the importance of far-field foreshocks as:

 

 

"This has been called the largest earthquake ever recorded in the U.S. or Canada at Mw 9.3. It was felt over approximately 700,000 square miles of Alaska, the Yukon and British Colombia, Canada. This was one of the most violent every recorded and vertical displacements were found over and area of 200,000 square miles.  On the southeast end of Montague Island vertical  displacement was up to 50 feet.

 

While uplift was great so was subsidence. The zone of subsidence covered and area of about 110,000 square miles and included the western portion sof Prince William Sound and nearly all of Kodiak Island.

 

The earthquake generated many tsunamis either directly or through landsliding. These devastated towns along the Gulf of Alaska and in Hawaii and California.

 

The low population of the area and the time of occurrence when schools and businesses were closed or uncrowded and low tides conspired to keep the death at about 131. The greatest damage occurred in Anchorage 80 miles from the epicenter where there were rock and mud- slides, slumping, water spouts, liquefaction and sand boils.

 

There were thousands of felt aftershocks in the months to come and total cost was estimated at $400 to $500 million.

 

 3 28 10  8 43 1964  43.000 -101.600  16 5.0   Wyoming/Dakotas

 

A foreshock occurred on March 27. Furniture vibrated and moved at Van Tassell. Also felt in Nebraska and South Dakota.

 

This event was felt over a large area of Nebraska, South Dakota, and border areas of Montana and Wyoming. It was the most widely felt shock since that of November 15, 1877 and was the first to center in Nebraska since March 1, 1935. At Alliance, part of a  Chimney cap fell on one residence. A highway about 10 miles south of Merriam sustained about 75 cracks and steep banks reportedly fell into the Niobrara River. Plaster fell, walls cracked and several dishes broke. Slight damage was also obtained in Martin and Deadwood, So. Dakota. The logical conclusion is that this event and the others in the western U.S. on this and the previous date were in some way related to the great Alaska  earthquake.

 

 3 28 10 10  0 1964  48.000 -113.800   0 5.0   Montana/Idaho

 3 28 15 19 40 1969  31.500 -114.300  33 5.0   SW U.S.A

 3 28  2 39 58 1973  44.479 -110.359   8 5.0   Yellowstone/Wyoming

 

Felt in the epicentral region.

 

 3 28  2 31  6 1975  42.061 -112.548   5 6.2   Montana/Idaho

 

In the Ridgdale area of the sparsely populated Pocatello Valley, this earthquake shifted several ranch houses on their  foundations and toppled many chimneys. At Malad City, 20 km northeast of this epicenter about 40 percent of Chimneys  were toppled. Total property damage was estimated at $1 million. Ground fractures were contained in a zone about 0.6 km long by 5 cm wide. The shock triggered many snow avalanches northeast of the valley. The largest earthquake ever located in this region." (March 28, 2018)

 

A series of forecasts (121628-121633) had expected today's activity. This included forecast 121630 which expected this activity around November 28, 2018. 

These epicenters are located at a right angle (node 4, 90 degrees) from the last major earthquake in the world - the M 7.5 in Minahasa of September 28 and was probably promoted by energy from that event. Tjey are also located at 101-102 degrees from the M 5.8 in Nias, Indonesia which occurred yesterday and may have been promoted from that recent source.

 

O: 30NOV2018 10:46:40  61.1N  151.0W ML=3.1  EMSC   SOUTHERN ALASKA

O: 30NOV2018 17:35:37  61.3N  149.9W Mw=5.8  EMSC   SOUTHERN ALASKA

O: 30NOV2018 17:29:26  61.3N  149.9W Mw=7.0  EMSC   SOUTHERN ALASKA

O: 30NOV2018 17:33:51  61.4N  149.9W ML=4.8  EMSC   SOUTHERN ALASKA

O: 01DEC2018 05:31:53  61.4N  150.0W Mw=4.5  EMSC   SOUTHERN ALASKA

O: 01DEC2018 06:08:27  61.4N  150.0W mb=4.0  EMSC   SOUTHERN ALASKA

O: 30NOV2018 17:39:36  61.4N  150.1W ML=4.0  EMSC   SOUTHERN ALASKA

O: 30NOV2018 19:42:46  61.4N  150.1W mb=4.2  EMSC   SOUTHERN ALASKA

O: 30NOV2018 18:30:52  61.5N  149.9W ML=4.0  EMSC   SOUTHERN ALASKA

O: 30NOV2018 18:00:06  61.5N  149.9W Mw=5.1  EMSC   SOUTHERN ALASKA

O: 01DEC2018 05:25:39  61.5N  149.9W mb=4.3  EMSC   SOUTHERN ALASKA

O: 30NOV2018 17:42:59  61.5N  149.9W mb=4.6  EMSC   SOUTHERN ALASKA

O: 30NOV2018 18:35:59  61.5N  150.0W ML=4.0  EMSC   SOUTHERN ALASKA

O: 30NOV2018 23:07:46  61.5N  150.0W mb=4.4  EMSC   SOUTHERN ALASKA

O: 01DEC2018 07:07:36  61.5N  150.0W mb=5.2  EMSC   SOUTHERN ALASKA

O: 30NOV2018 19:26:26  61.5N  150.3W mb=4.9  EMSC   SOUTHERN ALASKA

O: 30NOV2018 20:26:53  61.6N  150.2W mb=5.3  EMSC   SOUTHERN ALASKA

P: 27NOV2018 121630    61.0N  151.4W 3.2-5.2 AAAAA  Central Alaska             

P: 27NOV2018 121633    62.8N  149.1W 3.2-5.0 AAAAA  Central Alaska             

P: 28NOV2018 121628    60.1N  150.6W 3.2-5.0 AAAAA  Central Alaska             

P: 28NOV2018 121630    62.8N  151.2W 3.2-4.9 AAAAA  Central Alaska             

P: 28NOV2018 121631    62.7N  149.3W 3.2-4.9 AAAAA  Central Alaska             

 

The far-field aftershock of M 4.7 in the Vancouver Island region of Canada was lightly felt in that region. It occurred near local solar midnight and may have been enhanced by tidal effects which maximize near this hour. It is the strongest earthquake in the Vancouver Island region since a series on October 22, 2018 which included events of M 6.6, 6.8 and 6.5 among others.  Forecast 121611 had expected this earthquake within about 50 km was likely around November 28.

 

O:  1DEC2018 07:33:48  50.0N  129.4W mb=4.7  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 28NOV2018 121611    50.2N  129.8W 3.0-5.1 BAAAA  British Colombia           

 

An unusual earthquake of M 3.2-3.8 was lightly felt in the Buenos Aires area of Argentina several hours before the M 7.0 in Alaska. The juxtaposition in time with the Alaska earthquake may suggest a common stress acting on both. The last earthquake of M>=3.0 cited by NEIC within about 300 km of this event in Argentina occurred more than 30 years ago. This epicenter is located at 144 degrees from the M 7.5 in Minahasa of September 28; at the third node (120 degrees) from Alaska and at 103 degrees from the great Fiji quake of August 19, 2018 and may have been promoted from those sources by concentration of energy on the surface.

 

O: 30NOV2018 13:27:38  34.9S   58.5W ML=3.8  EMSC   BUENOS AIRES, ARGENTINA      

 

MODERATELY STRONG QUAKE SHAKES NIAS, INDONESIA

 

EARTHQUAKE SUMMARY FOR NOVEMBER 29, 2018

 

The strongest earthquake in the world today was an M 5.8 in the Nias region, Sumatra, Indonesia. An foreshock of M 4.6 preceded that mainshock about 3.4 minutes earlier. This is the largest earthquake located within about 250 km of this epicenter in Nias, Indonesia since an M 5.8 on September 1, 2016 and prior to that an M 6.1 on November 8, 2015. Forecast 121442 had expected this event was likely to the east around November 27.

 

O: 30NOV2018 02:44:28   0.2N   97.1E mb=4.8  EMSC   NIAS REGION, INDONESIA       

O: 29NOV2018 20:21:44   0.3N   97.1E Mw=5.8  EMSC   NIAS REGION, INDONESIA       

O: 29NOV2018 20:18:13   0.3N   97.3E mb=4.6  EMSC   NIAS REGION, INDONESIA        

P: 27NOV2018 121442     0.0N   99.0E 4.0-5.5 AABAA  So. Sumatera               

 

An M 4.2 was felt today in the region of Istanbul, Turkey, a region where a strong earthquake is likely in the near-term. Today's event was reported by NEIC to have been felt with intensity II-III within about 50 km of the epicenter at Buyukcekmece, Istanbul, Sultanbeyli, Ismit Kocaeli and Adapazan, Sakarya, Turkey. The last earthquake with M>=4.2 in the Anatolian Fault near Istanbul within about 150 km of this epicenter was an M 4.2 on June 25, 2016 and prior to that an M 4.4 on November 16, 2015, so today's event while small, may be regionally significant. Forecast 121597 had expected this earthquake around November 26 within about 100 km of this epicenter. A strong quake in Istanbul is anticipated in the near term by many geoscientists. Istanbul has experienced many large quakes in the past but is larger and more populous than when those quakes occurred.

 

O: 30NOV2018 02:36:35  40.6N   29.0E mb=4.2  EMSC   WESTERN TURKEY               

P: 26NOV2018 121597    41.0N   28.0E 3.0-5.1 BAAAA  Romania/NW Turkey          

 

The strongest earthquake felt in the U.S. or Canada today was an M 4.2-4.5 in the Fort St. John area of British Columbia, Canada. NEIC reported maximum intensity at Fort St. John of IV and II-III at Dawson Creek, Chelwynd and Tumbler Ridge, British Columbia, Canada. The last earthquake to occur within about 250 km of this epicenter with M>=4.5 was an M 4.6 on August 17, 2015 about 200 km northwest5 of today's epicenter. The only other sucj events in the past 30 years in this region occurred as an M 6.3 on April 14, 2001 and an M 5.0 on December 26, 1992. Forecast 121609 had expected regional activity with a moderate quake possible

 

NEIC reported these earthquakes of M 4.5 and 4.0 in the Fort St. John area were felt in Fore St. John, Taylor, Chetwynd and Dawson Creek. There were no reports of damage from Earthquakes Canada. The unusual location and size of these events as well as other moderate activity in the northwest U.S. and Canada over the past several weeks suggest stress to the west which is near to be released, probably in Alaska. around November 27. A moderately strong earthquake occurred in southern Alaska on November 21 and was reported here. Precursory activity was also noted for the region of Alaska in that summary as:

 

"A moderately strong earthquake of M 5.5-5.7 occurred in Southern Alaska today near Redoubt Volcano. It was widely felt with maximum intensity IV in Anchor Point, Alaska and II-III in Alaska at Ninilchik, Clam Gulch, Kasilof, Homer, Soldotna, Levelock, Sterling, Kenai, Cooper Landing, Anchorage, Seward, Elmendorf, Willow, Fort Richardson, Girdwood, Wasilla, Eagle River, Kodiak, Chugiak, Talkeetna, Palmer, Valdez, and possibly Fairbanks, Alaska.

The intermediate focus of this hypocenter at 145 km probably prevented damage and greater shaking in the area. The last earthquake within about 200 km of this epicenter with M>=5.7 was an M 7.1 on January 24, 2016. Today's quake is probably an aftershock of that event.  Forecasts 121370 and 121372 had expected today's activity within about 10 km of this epicenter in mid-November.

 

O: 21NOV2018 18:21:42  60.0N  153.3W Mw=5.5  EMSC   SOUTHERN ALASKA              

O: 21NOV2018 18:21:42  60.0N  153.3W Mw=5.7  ANSS   SOUTHERN ALASKA              

P: 14NOV2018 121370    60.0N  153.5W 3.2-5.0 CAAAA  Central Alaska             

P: 20NOV2018 121372    60.8N  151.7W 3.2-5.1 AAAAA  Central Alaska             

 

In addition to an M 4.8, the largest in the region of northern Idaho in more than 30 years which occurred yesterday, a pair of light earthquakes today in western Canada preceded the event in Alaska. These were an M 3.3 in the Sachs Harbor and an M 3.7 in the area near Mould Bay. It is not uncommon for a regional activation with significant earthquake in the Rocky Mountains to precede unusual earthquakes in Alaska and this may be another example of this type of precursory behavior." (November 21-22, 2018).

 

These earthquakes in Fort St. John are located at 104 degrees from the M 7.5 in  Minahasa, Indonesia of September 28, 2018 and were probably enhanced by seismic energy concentrated at this distance from that event.

 

O: 30NOV2018 02:15:00  56.0N  120.7W ML=4.0  EMSC   BRITISH COLUMBIA, CANADA     

O: 30NOV2018 02:15:01  56.0N  120.7W ML=4.0  NRCA  25 km SSE of Fort St. John

O: 30NOV2018 02:06:02  56.1N  120.7W ML=3.4  NRCA  23 km SE  of Fort St. John

O: 30NOV2018 01:27:00  56.1N  120.9W ML=4.5  EMSC   BRITISH COLUMBIA, CANADA     

O: 30NOV2018 01:27:07  56.0N  120.7W ML=4.5  NRCA  27 km SE  of Fort St. John    

P: 27NOV2018 121609    52.0N  115.0W 2.0-4.0 BCCAA  Alberta                    

 

While not felt, an M 4.8 also occurred in the western Andreanof Islands of the Aleutians, Alaska today. This is the largest quake within about 100 km of this epicenter since an M 4.8 a month ago on October 30 and a month before that as an M 4.8 on September 27, 2018. Forecast 121610 had expected this activity within about 50 km of this epicenter around November 26. It appears the high latitude seismic enhancement is not over yet. A minor geomagnetic storm is due today and could bring a large earthquake with it as noted below:

 

"The geomagnetic field is expected to see and quiet November 30 with minor storms December 1-2. Solar activity is expected to be at quiet conditions November 30 and December 1-2, 2018 with a slight chance (1%) of an M-class flare. Strong seismic enhancement at high latitudes is expected with this storm." (November 29-30, 2018)

 

Today's event occurred within minutes of local solar midnight and was probably enhanced by tidal stresses which maximize at this hour.

 

O: 29NOV2018 11:24:09  51.3N  178.1W mb=4.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 26NOV2018 121610    51.6N  177.6W 3.5-5.0 BAAAA  Andreanoff Isls, Aleutians 

 

An M 3.9 also occurred in southern California today near Thermal, CA. NEIC reported maximum intensity IV at Imperial, California and II-III in Thermal, Ocotillo, Borrego Springs, Julian, Boulevard, El Centro, Pine Valley and Brawley among others. Forecast 121544 expected a light to moderate quake in this rea around November 30.

 

O: 29NOV2018 16:55:48  33.0N  116.0W Ml=2.0  EMSC   SOUTHERN CALIFORNIA          

O: 29NOV2018 13:48:53  33.0N  116.0W Mw=3.9  EMSC   SOUTHERN CALIFORNIA          

P: 30NOV2018 121544    32.0N  116.3W 2.5-4.6 AAAAA  So. California             

 

MODERATE QUAKE SHAKES NORTHERN INDIA-MYANMAR

 

EARTHQUAKE SUMMARY FOR NOVEMBER 28, 2018

 

The largest earthquake of the day was of M 5.3 - in Myanmar-India border. NEIC reported this earthquake of M 5.3 on the India-Myanmar border  was felt with intensity II-III in the area(s) of India at Tezy Arunachal Pradesh and Dulia Gaon Assam.  The earthquake in Myanmar is the strongest within about 250 km of that epicenter since an M 5.4 November 6, 2013. It is the strongest within about 150 km in at least 30 years. Forecast 121248 expected activity in this area in late November.

 

O: 28NOV2018 10:17:05  27.2N   97.0E Mw=5.3  EMSC   MYANMAR-INDIA BORDER REGION  

P: 19NOV2018 121248    28.0N  101.0E 4.0-5.4 CACAA  Myanmar                    

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Gulf of Alaska aftershock zone. It was not reported felt. A great earthquake of M 7.9 started the year 2018 off in this region on January 23, 2018. Aftershocks of M 4.4 on November 4, 2018 and M 4.9 on October 27, 2018 are the most recent of M>=4.2 in this aftershock zone. Forecast 121636 expected today's activity in the Gulf of Alaska around November 26.

 

 

O: 28NOV2018 10:58:31  56.4N  149.0W mb=4.2  EMSC   GULF OF ALASKA               

P: 26NOV2018 121636    54.9N  150.8W 3.0-4.8 ABAAA  Gulf of  Alaska            

 

NUSUAL M 4.0 SHAKES CENTRAL CALIFORNIA

 

EARTHQUAKE SUMMARY FOR NOVEMBER 27, 2018

 

A moderate earthquake of M 4.0 hit the region of Central California near Avenal today.  NEIC reported intensity II-III within about 150 km of the epicenter at Avenal,  Coalinga, Huron, Hanford, Visalia, King City, Fresno, Clovis, San Luis Obispo, Los Osos, Oceano, Woodlake, Nipomo, Auberry, Coarsegold, Merced and Shaver Lake, California among others. NEIC reported aftershocks of M 2.9 and 2.5 in Central California were felt with intensity II-III in the area(s) of Morro Bay, Clovis and Los Osos, California.  The M 4.0 is the strongest event within about 50 km of this epicenter since an M 4.1 on March 27, 2015.  Forecast 121262 had expected today's epicenter would be active within about 10  km around November 20.

 

O: 27NOV2018 16:00:51  36.1N  120.2W Md=2.5  EMSC   CENTRAL CALIFORNIA           

O: 27NOV2018 17:29:57  36.1N  120.2W Md=2.9  EMSC   CENTRAL CALIFORNIA           

O: 27NOV2018 13:07:12  36.1N  120.2W Mw=4.0  EMSC   CENTRAL CALIFORNIA           

P: 20NOV2018 121262    36.1N  120.1W 2.5-4.4 CAAAA  Central California         

 

Moderately large earthquakes today occurred in Hokkaido, Japan (M 5.5); North Atlantic (M 5.5), the Ascension Island area (M 5.8); New Britain (M 5.5) and the Loyalty Islands (M 5.7). NEIC reported this earthquake of M 5.5 in Hokkaido, Japan was felt with intensity II-III in the area(s) of Sapporo, Hokkaido and Misawa, Aomori, Japan. The earthquake in Hokkaido is the strongest within about 150 km of this epicenter since an M 6.2 about 100 km southwest of today's epicenter on January 24, 2018. An M 6.6 on September 5, 2018, the only other such event in the region in the past year was about 250 km northwest of today's epicenter. Forecast 121570 had expected this event within this area was likely around November 28.

 

O: 28NOV2018 02:23:24  41.4N  143.3E Mw=5.5  EMSC   HOKKAIDO, JAPAN REGION       

P: 28NOV2018 121570    42.0N  144.0E 3.5-5.7 AAAAA  Hokkaido, Japan            

 

The M 5.5 in the North Atlantic continues a strong series of aftershocks in the region east of the Leeward Islands. It was not reported felt in the epicentral area in the central Atlantic. It is the strongest in this series since an M 6.2 on November 11, 2018, the only other such event within about 250 km in the past 30 years and is an aftershock of that event. An M 6.0 occurred southeast of this on July 27, 2017 and was followed by an M 5.7 on October 3, 2017. These may have helped set up to current activity. Forecast 121484 expected this activity in the mid-Atlantic around November 25 about 250 km to the northeast of today's epicenter. This may have been promoted by an M 5.8 in the Ascension Island area to the east earlier in the day.

 

O: 27NOV2018 19:34:45  15.6N   49.8W Mw=5.5  EMSC   NORTH ATLANTIC OCEAN         

P: 25NOV2018 121484    17.0N   47.0W 4.0-5.5 ABBAA  Mid-Atlantic Ridge         

 

The earthquake of M 5.5 in the Bougainville region PNG was not reported felt. It is the first at this magnitude level within about 200 km of the epicenter since an M 5.8 on August 22, 2018, the only such earthquake in this area since March 3, 2017. These are probably regional aftershocks of an M 7.9 which hit about 100 km northeast of this on January 22, 2017.  Forecast 121453 expected activity in this area was likely around November 25.

 

O: 27NOV2018 09:22:15   7.1S  154.8E mb=5.5  EMSC   BOUGAINVILLE REGION, P.N.G.  

P: 25NOV2018 121453     7.0S  152.0E 4.0-5.4 AABAA  New Britain                

 

A moderately strong M 5.7 also occurred today in the Loyalty Islands Southwest Pacific. This is an active, albeit remote area, and moderately large quakes in the area are not often felt. The last earthquake in the Loyalty Islands within about 250 km of this epicenter occurred October 16, 2018 with M 5.8 and 6.4 about 250 km to the southwest of today's epicenter. An M 7.1 hit about 150 km  to the southeast on August 29, 2018. Today's activity may be a regional aftershock of that event.  Forecast 121403 had expected this area would be active at this level in late November.

 

O: 27NOV2018 15:41:19  21.3S  171.4E Mw=5.7  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 19NOV2018 121403    21.0S  169.0E 4.0-5.9 CABAA  Loyalty Islands            

 

The strongest earthquake of the day was an M 5.8 in the area north of Ascension Island in the mid-Atlantic off the west coast of Africa. It was not reported felt. This is a region where large quakes are often followed by promoted activity on the western border of the North American plate. The M 5.5 in Mexico yesterday could be related. The only similar event within about 200 km of this epicenter in the past five years was an M 6.6 on August 18, 2017. This is the strongest aftershock of that event to date. Forecast 121447 had expected today's activity to the west in this area was likely around November 28.

 

 

O: 27NOV2018 12:03:27   1.0S   13.7W Mw=5.8  EMSC   NORTH OF ASCENSION ISLAND    

P: 28NOV2018 121447     1.0S   16.0W 4.0-5.4 AABAA  Central Mid-Atlantic       

 

November 29, 2018 marks the 40th anniversary of the great Oaxaca, Mexico quake of November 29, 1978. This event is sometimes cited as a major milestone in the science of earthquake prediction, but this has been disputed by others. The earthquake history for this event reads:

 

 

"Earthquake centered southeast of Mexico City in Oaxaca (about 450 km south).

Seven deaths were reported in Mexico City and one in the epicentral area. Much damage occurred in the epicentral area. The quake was preceded by a seismic quiet period and activation and followed by a number of aftershocks." (November 29, 2017)

 

MODERATELY STRONG QUAKE IN REVILLA GIGEDO ISLANDS, MEXICO

 

EARTHQUAKE SUMMARY FOR NOVEMBER 26, 2018

 

The strong earthquake in the world today was an M 5.5 in western Mexico in the area of the Revilla Gigedo Islands. This event occurred near local solar midnight and may have been promoted by high tidal stresses associated with the full moon. The last earthquake in the Revilla Gigedo Islands within about 200 km of today's epicenter was an M 5.5 on May 5, 2016. The last of larger magnitude was an M 5.9 on September 6, 2014. Forecasts 121497 and 121473 had expected this activity at the end of November. Stresses may spread to the north into the Gulf of California and southern and Baja California activating faults in those areas in the coming week. This epicenter is at 105 degrees from the Ionian Sea and may have been promoted from that source.

 

O: 27NOV2018 05:37:57  19.2N  108.4W Mw=5.5  EMSC   REVILLA GIGEDO ISLANDS REGION

P: 23NOV2018 121497    20.0N  109.0W 3.5-5.1 BAAAA  Gulf of California         

P: 30NOV2018 121473    19.0N  107.0W 3.5-5.2 BAAAA  Coast of Jalisco, Mexico   

 

An aftershock in Fiji of M 5.5-5.6 also occurred today, as did an M 5.4 in the Snares Island area of southern New Zealand. Neither event was unusual at this time.  GEONET reported six people felt the aftershock in Southern New Zealand with weak intensity. Forecasts 121691 and 121660 had expected this activity within about 100 km of the epicenters.

 

O: 26NOV2018 09:57:00  47.9S  165.4E mb=4.9  EMSC   OFF W. COAST OF S. ISLAND, N.Z

O: 26NOV2018 09:57:05  48.1S  165.9E ML=5.4  GEONET reported six people felt this quake with weak intensity.

P: 25NOV2018 121691    47.0S  166.0E 3.0-5.1 AAAAA  Southern S. Isl. N.Z.      

 

O: 27NOV2018 02:45:32  17.9S  178.6W Mw=5.6  EMSC   FIJI REGION                   

P: 25NOV2018 121660    18.0S  179.0W 4.0-5.5 AAAAA  Tonga Islands              

 

The strongest earthquake in the U.S or Canada today was an M 4.4 in the Rat Islands, Aleutians. It was not reported felt in this remote area. The last earthquake within about 150 km of this event in the Rat Islands with M>=4.4 was an M 4.4 on October 31, 2018. The last of significantly larger magnitude was an M 4.8 on March 19, 2018. Forecast 121620 expected this event within about 50 km was likely around November 28. 

 

O: 26NOV2018 16:20:52  52.3N  179.3E mb=4.4  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 28NOV2018 121620    52.0N  179.0E 4.0-5.6 AAAAA  Rat Islands                

 

SPOTLIGHT ON IRAN-IRAQ BORDER

 

EARTHQUAKE SUMMARY FOR NOVEMBER 25, 2018

 

A strong earthquake of M 6.3 and a number of foreshocks and aftershocks of moderate magnitude hit the region of the border of Iran and Iraq. NEIC reported maximum shaking VIII (damage) in the epicenteral area of Iraq; V in Halubah, Iraq; IV within about 150 km of the epicenter. On-line photos showed considerable damage. NEIC reported it was felt with intensity up to V as far as 600 km from the epicenter Kuwait, Iran and Iraq Reports from BBC News indicate more than 700 were injured in Kermanshah, Iran most with minor injuries. 18 people were hospitalized according to Iranian Sate TV most of whom were involved in a panic when the tremors began. In Iraq Kurdistan one person was killed and 43 others were injured in the quakes. The last earthquake of M>=6.3 within about 200 km of this epicenter occurred as an M 7.3 on November 12, 2017, the only such event in the region in at least 30 years. Forecast 121534 had expected this event about 150 km to the north was likely around November 25. This activity is located near 100 degrees from the M 7.3 in Venezuela of August 21, 2018 and may have been promoted from that source.

 

O: 25NOV2018 20:56:38  34.1N   45.5E mb=4.4  EMSC   IRAN-IRAQ BORDER REGION

O: 25NOV2018 22:28:20  34.2N   45.6E mb=4.1  EMSC   IRAN-IRAQ BORDER REGION

O: 25NOV2018 23:00:46  34.2N   45.6E mb=5.0  EMSC   IRAN-IRAQ BORDER REGION

O: 26NOV2018 00:38:35  34.2N   45.7E mb=4.9  EMSC   IRAN-IRAQ BORDER REGION

O: 25NOV2018 16:41:09  34.3N   45.6E ML=4.6  EMSC   IRAN-IRAQ BORDER REGION

O: 25NOV2018 17:21:05  34.3N   45.7E ML=4.0  EMSC   IRAN-IRAQ BORDER REGION

O: 26NOV2018 01:19:41  34.3N   45.7E mb=4.9  EMSC   IRAN-IRAQ BORDER REGION

O: 25NOV2018 16:37:31  34.3N   45.7E mb=6.3  EMSC   IRAN-IRAQ BORDER REGION

O: 25NOV2018 17:09:36  34.3N   45.8E mb=5.2  EMSC   IRAN-IRAQ BORDER REGION

O: 25NOV2018 17:31:19  34.4N   45.7E ML=4.1  EMSC   IRAN-IRAQ BORDER REGION

O: 25NOV2018 20:42:41  34.0N   45.6E mb=4.3  EMSC   IRAN-IRAQ BORDER REGION       

P: 25NOV2018 121534    36.0N   46.0E 4.8-6.2 ABAAA  No. Iran                   

 

A moderately strong earthquake of M 5.7-6.1 also occurred west of Taiwan in the Taiwan Strait today.  CWB reported this earthquake was felt with intensity III in Penghu, Kinmen, Tainan, Yunlin, Chiayi, Changhua and Chiayi Counties; II in Nantou, Kaohsiung and Taichung and I in Miaoli, Taitung, Hualien, Hsinchu, Lienchiang, Pingtung and Taipei Counties, Taiwan.  The smaller events were generally felt with intensity I-II in western Taiwan in Penghu, Kinmen, Tainan, Chiayi, Changhua, Yunlin and Chiayi Counties. NEIC reported this earthquake of M 5.7 in the Taiwan Strait was felt with intensity IV in Xiamen Fujian and Shantou Guangdong, China and II-III in the area(s) of Taiwan at Kinhsia, Tainan, Chiayi, Changhwa, Taichung and in China with II-III in Longyan Fujian and Quamzhou, China. This is an unusual epicenter about 200 km west of the normal seismicity in the region. The last, and only earthquake in the past 30 years, within this area with M>=5.7 occurred on September 16, 1994 with M 6.7-6.8. Forecast 121505 had expected a moderate earthquake to the east in Taiwan likely around November 26.

 

 

 

O: 25NOV2018 23:57:24  23.4N  118.6E Mw=5.7  EMSC   TAIWAN STRAIT                

O: 25NOV2018 23:57:25  23.4N  118.6E ML=6.1  TAI    Hualien, Taiwan              

O: 26NOV2018 00:15:17  23.4N  118.6E ML=4.7  TAI    Hualien, Taiwan              

P: 21NOV2018 121252    23.0N  121.0E 4.0-5.4 BABAA  Taiwan                     

P: 26NOV2018 121505    22.0N  121.0E 4.0-5.5 ABBAA  Taiwan                     

 

The other unusual earthquakes of the day continued in the Caribbean Sea north of Colombia today. The mainshock occurred yesterday with M 6.1. The strongest aftershock today was M 5.6. At that time this summary noted in this regard:

 

"NEIC reported the Colombia event was felt in Colombia at San Andres and in Panama at Panama City with intensity II-III. This is an unusual epicenter northwest of Colombia in the Caribbean Sea. The mainshock was followed by a series of moderate aftershocks including an M 4.6, 4.4 and 4.2. The last earthquake of M>=6.1 in this area of the Caribbean Sea occurred more than 30 years ago. An earthquake of M 5.7 hit about 100 km northwest of this on February 11, 1995. The location of these earthquakes suggests they were probably promoted by the full moon which had maximum tidal stresses at this longitude as noted (note the epicenter at 81W compared with maximum tidal stress at 80W) in previous summaries:

 

"The full moon arrived at 05:39 UT on November 23. Longitudes which are sublunar at this time were near 80 West and 100 East longitudes. These include areas of central America and western South America in the west and Indonesia in the east. While these will see maximum tidal stresses in the next week, many areas near rupture could see enhanced seismicity due to tidal stresses at this time. In general these will be more likely to see significant seismicity near local solar noon and midnight when tidal stresses maximize." (November 21-24, 2018)

 

Forecast 121691 had expected this event around November 25. It is the strongest within about 200 km of Snares Island, New Zealand since an M 6.6 on July 11, 2017 and prior to that an M 6.2 on February 15, 2016 after a lull period between 2009 and 2016.

 

Forecast 121436 had expected this event was likely around November 24 within  about 100 km of the epicenter. The timing of the aftershocks at local solar midnight also suggests tidal promotion. This epicenter is also located the fourth node (90 degrees) from the Ionian Sea and the fifth node (72 degrees) from the Jan Mayen event (both M 6.8) at 103 degrees from the M 8.2 in Fiji of September and August, 2018 and was probably promoted by concentrated energy from those events." (November 24-25, 2018)

 

 

NEIC reported this earthquake of M 5.6 in the Caribbean Sea was felt with intensity II-III in the area(s) of San Andres Providence, Colombia.

 

O: 25NOV2018 10:45:17  13.1N   81.2W mb=4.4  EMSC   CARIBBEAN SEA

O: 25NOV2018 16:19:46  13.1N   81.2W mb=4.5  EMSC   CARIBBEAN SEA

O: 26NOV2018 06:36:13  13.1N   81.2W mb=4.5  EMSC   CARIBBEAN SEA

O: 25NOV2018 15:45:58  13.1N   81.2W mb=4.9  EMSC   CARIBBEAN SEA

O: 26NOV2018 01:50:38  13.1N   81.4W mb=4.4  EMSC   CARIBBEAN SEA

O: 26NOV2018 03:43:04  13.2N   81.0W mb=4.7  EMSC   CARIBBEAN SEA

O: 26NOV2018 01:57:06  13.2N   81.3W mb=4.4  EMSC   CARIBBEAN SEA

O: 25NOV2018 20:56:37  13.1N   81.2W Mw=5.6  EMSC   CARIBBEAN SEA                

P: 24NOV2018 121436    13.0N   81.0W 4.5-6.0 AAAAA  Colombia                   

P: 27NOV2018 121469    13.0N   81.0W 3.5-5.1 AAAAA  Caribbean Sea              

 

The activation of high southern latitudes also continued today with another M 5.3 on the Pacific-Antarctic Ridge. This is a remote area and this event was not reported felt. A strong earthquake hit the Pacific-Antarctic Ridge with M 5.9 on November 22 about 250 km southwest of today's epicenter.  Forecast 121693 had expected today's event to the southwest of the epicenter was likely around November 24. This epicenter is at 103 degrees from the Vancouver swarm of October 22 and was probably promoted by concentrated energy from those events.

 

O: 26NOV2018 00:24:40  53.9S  134.2W mb=5.3  EMSC   PACIFIC-ANTARCTIC RIDGE      

P: 24NOV2018 121693    55.0S  139.0W 4.0-5.5 ABCAA  Pacific-Antarctic Ridge    

 

STRONG QUAKES IN CARIBBEAN AND NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR NOVEMBER 24, 2018

 

Strong earthquakes of M 6.0 occurred today in the regions of the Caribbean north of Colombia and in  South Island, New Zealand.  NEIC reported the Colombia event was felt in Colombia at San Andres and in Panama at Panama City with intensity II-III. This is an unusual epicenter northwest of Colombia in the Caribbean Sea. The mainshock was followed by a series of moderate aftershocks including an M 4.6, 4.4 and 4.2. The last earthquake of M>=6.1 in this area of the Caribbean Sea occurred more than 30 years ago. An earthquake of M 5.7 hit about 100 km northwest of this on February 11, 1995. The location of these earthquakes suggests they were probably promoted by the full moon which had maximum tidal stresses at this longitude as noted (note the epicenter at 81W compared with maximum tidal stress at 80W) in previous summaries:

 

"The full moon arrived at 05:39 UT on November 23. Longitudes which are sublunar at this time were near 80 West and 100 East longitudes. These include areas of central America and western South America in the west and Indonesia in the east. While these will see maximum tidal stresses in the next week, many areas near rupture could see enhanced seismicity due to tidal stresses at this time. In general these will be more likely to see significant seismicity near local solar noon and midnight when tidal stresses maximize." (November 21-24, 2018) Forecast 121691 had expected this event around November 25.

 

It is the strongest within about 200 km of Snares Island, New Zealand since an M 6.6 on July 11, 2017 and prior to that an M 6.2 on February 15, 2016 after a lull period between 2009 and 2016.

 

Forecast 121436 had expected this event was likely around November 24 within about 100 km of the epicenter. The timing of the aftershocks at local solar midnight also suggests tidal promotion. This epicenter is also located the fourth node (90 degrees) from the Ionian Sea and the fifth node (72 degrees) from the Jan Mayen event (both M 6.8) at 103 degrees from the M 8.2 in Fiji of September and August, 2018 and was probably promoted by concentrated energy from those events.

 

O: 25NOV2018 05:28:35  13.0N   81.1W mb=4.2  EMSC   CARIBBEAN SEA                

O: 25NOV2018 05:16:15  13.0N   81.2W mb=4.4  EMSC   CARIBBEAN SEA                

O: 25NOV2018 03:40:50  13.1N   81.2W Mw=6.1  EMSC   CARIBBEAN SEA                

O: 25NOV2018 01:19:05  13.2N   81.2W mb=4.6  EMSC   CARIBBEAN SEA                

P: 24NOV2018 121436    13.0N   81.0W 4.5-6.0 AAAAA  Colombia                   

 

An earthquake of M 5.8-6.1 in South Island, New Zealand may have been felt in Christchurch, New Zealand according to NEIC. GEONET reported the M 6.1 was felt with light intensity by 8 and with weak shaking by 45. A total of 53 reported feeling this event in southern South Island. The M 4.4 aftershock was not reported felt. The mainshock occurred within about an hour of local solar noon and was probably promoted by tidal stresses which  maximize at this hour. This epicenter is at the sixth node from the M 7.5 in Minahasa of September 28, 2018 and may have been promoted from that source.

 

O: 24NOV2018 23:42:42  47.9S  165.4E Mw=6.0  EMSC   OFF W. COAST OF S. ISLAND, N.Z

O: 24NOV2018 23:42:39  47.9S  165.5E ML=6.1  GEONET Felt with light intensity

O: 25NOV2018 01:32:32  47.9S  165.5E ML=4.4  GEONET Not reported felt.

P: 25NOV2018 121691    47.0S  166.0E 3.0-5.1 AAAAA  Southern S. Isl. N.Z.      

 

An earthquake of M 5.6 also occurred at the opposide end of New Zealand in the Kermadec Islands today. It was not reported felt in the epicentral area which  is remote. The last earthquake in the Kermadec Islands within about 200 km of this epicenter with M>=5.6 occurred July 28, 2018 with M 5.6 and prior to that as an M 5.9 on July 7, 2018. Forecast 121666 had expected today's epicenter would be active within about  50 around November 23.

 

O: 25NOV2018 06:14:32  29.2S  177.4W Mw=5.6  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 23NOV2018 121666    29.0S  177.0W 4.0-5.7 AAAAA  No. Kermadec Islands       

 

STRONG SEISMICITY NORTH OF ANTARCTICA CONTINUES

 

EARTHQUAKE SUMMARY FOR NOVEMBER 23, 2018

 

The strong to moderately strong earthquakes of the pat week continued with an M 5.6 and 4,9 in the region of the South Sandwich Islands. These were not reported felt no were there reports of tsunamis with these earthquakes. An M 5.9 occurred yesterday along the Antarctic-Pacific Ridge, the latest in a series of such events in the southern Oceans in the past week.  The last earthquake with M>=5.6 within about 200 km of this epicenter was an M  6.3 about 100 km east of today's epicenter. The last such quake within about 100 km of today's epicenter was an M 7.2 on May 28, 2016. Today's event is probably an aftershock of that M 7.2.

Forecast 121428 had expected this activity within about 50-100 km of this epicenter was likely around November 17. These earthquakes are located at 101-103 degrees from the recent large earthquakes in Fiji and the Ionian Sea and are probably being promoted by concentrated energy from those event. A light in Georgia (US) and an M 4.9 in Colombia were also at this distance from Fiji today.

 

O: 23NOV2018 10:52:01  56.4S   27.1W mb=5.6  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 23NOV2018 21:41:03  56.7S   25.7W mb=4.9  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 17NOV2018 121428    56.0S   28.0W 4.0-5.7 CAAAA  So. Sandwich Islands       

 

An M 2.7 in U.S. northern Georgia was widely felt in the epicentral zone today. NEIC reported this earthquake of M 2.7 in Georgia (US) was felt with intensity II-III in the area(s) of Plainville, Calhoun, Adairsville, Kingston, Rome, Jasper,   This may be related to a budding tropical depression southeast of this in the North Atlantic as noted in this summary:

 

"A tropical disturbance may be forming in the region of Bermuda. This system is given a 10% chance of developing into a tropical cyclone in the next two days by NHC. It is unlikely to promote seismicity at this time as it is expected to track into the central Atlantic from its current position at 25N 70W." (November 22-23, 2018)

 

The last earthquake with M>=2.7 within about 100 km of this epicenter in Georgia was an M 2.7 on August 29, 2018. The last such event with M>2.8  occurred as an M 3.0 on December 10, 2013.  Forecast 121272 had expected regional seismicity in mid-November.

 

O: 23NOV2018 14:59:55  34.4N   85.0W Md=2.7  EMSC   GEORGIA, USA                 

P: 17NOV2018 121272    35.9N   82.8W 2.0-4.0 CBBAA  Kentucky/Tennessee/NC      

 

STRONG EARTHQUAKE ON PACIFIC-ANTARCTIC RIDGE

 

EARTHQUAKE SUMMARY FOR NOVEMBER 22, 2018

 

Strong seismicity at high latitudes continued today with an M 5.9 on the Pacific-Antarctic  Ridge. It was not reported felt in this remote epicentral area. The last event of M>=5.9 within about 300 km of this epicenter was an M 6.0 on May 19, 2010. Most activity since that time in the area at this magnitude level has occurred about 500 km to the southwest near 57S 142W including the latest - an M 5.9 on May 1, 2018.  As today's quake occurred with the full moon, it is possible it was promoted by high tidal stresses as noted in previous issues of this summary:

 

"The full moon will arrive at 05:39 UT on November 23. Longitudes which are sublunar at this time are near 80 West and 100 East longitudes. These include areas of central America and western South America in the west and Indonesia in the east. While these will see maximum tidal stresses in the next week many areas near rupture could see enhanced seismicity due to tidal stresses at this time. In general these will be more likely to see significant seismicity near local solar noon and midnight when tidal stresses maximize." (November 20-23, 2018)

 

This epicenter is at 103 degrees from the strong quakes in Vancouver, Canada (M 6.8) of October 22 and was probably promoted by concentrated energy  from that source. After strong earthquakes seismic energy reflects and refracts off core-mantle  and is redirected back to the surface near 103 degrees in a concentrated form where it may help promote further seismicity. Other moderate quakes near this distance from Vancouver today occurred in Pakistan, the Molucca Sea and the Banda Sea, Indonesia.

 

 

 

O: 22NOV2018 16:07:04  54.2S  137.4W Mw=5.9  EMSC   PACIFIC-ANTARCTIC RIDGE       

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in the Fox Islands, Alaska. It was not reported felt in this remote area. The last such earthquake in the Fox Islands within about 150 km of this epicenter occurred with last full moon on October 24, 2018 with M 4.0.

Forecast 121354 had expected this event was likely around November 17.

 

O: 22NOV2018 18:22:48  52.2N  170.4W mb=4.0  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 17NOV2018 121354    51.9N  169.2W 3.5-5.2 BAAAA  Fox Islands, Aleutians     

 

 

 

 

 

MODERATELY STRONG QUAKE HITS SW OF ANCHORAGE, ALASKA

 

EARTHQUAKE SUMMARY FOR NOVEMBER 21, 2018

 

A moderately strong earthquake of M 5.5-5.7 occurred in Southern Alaska today near Redoubt Volcano. It  was widely felt with maximum intensity IV in Anchor Point, Alaska and II-III in Alaska at Ninilchik, Clam Gulch, Kasilof, Homer, Soldotna, Levelock, Sterling, Kenai, Cooper Landing, Anchorage, Seward, Elmendorf, Willow, Fort Richardson, Girdwood, Wasilla, Eagle River, Kodiak, Chugiak, Talkeetna, Palmer, Valdez, and possibly Fairbanks, Alaska. The intermediate focus of this hypocenter at 145 km probably prevented damage and greater shaking in the area. The last earthquake within about 200 km of this epicenter with M>=5.7 was an M 7.1 on January 24, 2016. Today's quake is probably an aftershock of that event.  Forecasts 121370 and 121372 had expected today's activity within about 10 km of this epicenter in mid-November.

 

O: 21NOV2018 18:21:42  60.0N  153.3W Mw=5.5  EMSC   SOUTHERN ALASKA              

O: 21NOV2018 18:21:42  60.0N  153.3W Mw=5.7  ANSS   SOUTHERN ALASKA              

P: 14NOV2018 121370    60.0N  153.5W 3.2-5.0 CAAAA  Central Alaska             

P: 20NOV2018 121372    60.8N  151.7W 3.2-5.1 AAAAA  Central Alaska             

 

In addition to an M 4.8, the largest in the region of northern Idaho in more than 30 years which occurred yesterday, a pair of light earthquakes today in western Canada preceded the event in Alaska. These were an M 3.3 in the Sachs Harbor and an M 3.7 in the area near Mould Bay. It is not uncommon for a regional activation with significant earthquakes in the Rocky Mountains to precede unusual earthquakes in Alaska and this may be another example of this type of precursory behavior. The last earthquake with M>=3.3 within about 200 km of the Sachs Harbour epicenter was an M 4.2 on July 15, 2017 and again on January 22, 2017 The last of larger magnitude was an M 4.8 on March 23, 2013.

Forecast 121381 had expected this event within about 50 km of this epicenter was likely around November 19.

 

O: 21NOV2018 15:12:18  72.3N  133.2W ML=3.3  NRCA  273 km W   of Sachs Harbour   

O: 21NOV2018 03:47:32  71.0N  133.3W ML=2.7  NRCA  295 km N   of Inuvik          

P: 19NOV2018 121381    72.0N  131.0W 2.5-4.1 AAAAA  Yukon Territory, Canada     

 

The last event within about 200 km of the M 3.7 in the Mould Bay area occurred August 3, 2013 with M 4.5. Forecast 121378 had expected this event within about 150 km of this epicenter  was likely around November 18.

 

O: 20NOV2018 23:26:32  77.7N  116.5W ML=3.7  NRCA  175 km NE from Mould Bay      

P: 18NOV2018 121378    79.0N  114.0W 4.0-5.6 ABAAA  Arctic Ocean Region        

UNUSUAL QUAKE IN NORTHERN IDAHO

 

EARTHQUAKE SUMMARY FOR NOVEMBER 20, 2018

 

An M 4.8 occurred in northern Idaho today. This unusually large event was reported by NEIC to have been felt with intensity II-III in Idaho at Grangeville, Kooskia, Kamiah, Greencreek, White Bird, Ferdinand, Cottonwood, Elk City, Pierce with maximum reported intensity V in Lucile, Idaho. Curiously, this epicenter is directly north of the Baja California quake of M 4.8 yesterday. The relation, if any, is unknown. The last earthquake in northern Idaho north of the Borah Peak region of southern Idaho with M>=4.8 within about 200 km of today's epicenter occurred more than 30 years ago. The last and only such events in southern Idaho in this area occurred January 3, 2015 (M 4.9); April 13, 2014 (M 4.9) and June 7, 1994 (M 5.0). An M 3.0 occurred in this region today within minutes of local solar midnight and may have been promoted by high tidal stresses which maximize at this hour. Forecast 121321 had expected a moderate quake in this region was likely around November 18 to the north of this epicenter in Idaho.

 

O: 20NOV2018 22:39:07  46.0N  115.8W ml=4.8  ANSS   northern Idaho               

P: 18NOV2018 121321    47.5N  115.8W 2.0-4.1 ABAAA  Montana/Idaho              

 

O: 20NOV2018 07:11:39  44.3N  115.0W Ml=3.0  EMSC   SOUTHERN IDAHO               

P: 18NOV2018 121319    44.6N  116.0W 2.0-3.9 AAAAA  Montana/Idaho              

 

The strongest earthquake in the world today occurred as an M 5.5 in the region of Kyushu, Japan. NEIC did not report this was felt, but JMA indicated light shaking in the epicentral area southwest of Honshu, Japan. The last earthquake within about 200 km of this epicenter in Kyushu with M>=5.5 was an M 5.5 on December 20, 2017 and prior to that an M 5.7 on April 29, 2017.   Forecast 121273 expected this activity was likely within about 100 km of the epicenter around November 18. This epicenter is located near the fifth node (72 degrees) from the Vancouver Islands quakes of October 22 and may have been promoted from that source.

 

O: 20NOV2018 19:09:51  30.5N  130.1E Mw=5.5  EMSC   KYUSHU, JAPAN                

P: 18NOV2018 121273    31.0N  131.0E 3.5-4.9 AAAAA  Kyushu, Japan area         

 

Moderate earthquakes near Mindanao, Philippines, including the second largest of the day - an M 5.3 in the area south of Mindanao also occurred today. This area was hit by Tropical Storm 33W Seismicity was expected to increase with landfall as noted in the previous issue of this summary:

 

"Tropical Depression 33W continued east of the Philippines today with winds up to 40 kts. It is expected to track to the west reaching Mindanao around November 20-21. The area is seismic and a moderate to large regional earthquake could be promoted at this time by stresses associated with landfall of this storm." (November 19-20, 2018)

 

The largest of these, an M 5.3, occurred near local solar noon any may have been promoted by tidal stresses.  BMG reported the M 5.3 was felt with intensity II-III in Bitung, northern Minahasa and II in Ternate, Sulawesi, Indonesia. The M 4.7 was felt with intensity II-III in northern Minahasa and II in Manado, Sulawesi, Indonesia. The last earthquake with M>=5.3 in this area of the Molucca Sea within about  200 km of this epicenter was an M 5.5 on November 11, 2018 and prior to that an M 5.4 on October 25, 2018 after a quiet period from June to October, 2018. Forecasts 120932 and 121184 had expected activity in this area in mid-November. This activity is at 103 degrees from earthquakes of M 6.8 in the Jan Mayen area and from the M 6.8 in the Ionian Sea of Greece. Seismic energy is concentrated at the surface in this distance range and may help promote additional seismicity at this distance from large earthquakes.

 

O: 21NOV2018 04:31:29   0.5N  126.0E mb=5.3  EMSC   MOLUCCA SEA                  

O: 21NOV2018 04:31:25  00.5N  126.0E MS=5.3  BMG  Felt with intensity II-III

O: 21NOV2018 06:39:15  00.8N  125.4E MS=4.7  BMG  Felt with intensity II-III

O: 21NOV2018 06:39:14   0.8N  125.4E ML=5.0  EMSC   MOLUCCA SEA                   

P: 10NOV2018 120932     0.0N  125.0E 4.0-5.5 DAAAA  Mindanao, Philippines      

P: 17NOV2018 121184     0.0N  122.0E 4.0-5.5 BACAA  Celebes Sea                

 

An M 4.1 in northern Mindanao, Philippines occurred as the eye was making landfall near this epicenter today. It occurred near local solar midnight and may have been further promoted by tidal stresses.

 

O: 20NOV2018 16:59:00   9.9N  126.2E ML=4.1  EMSC   MINDANAO, PHILIPPINES        

P: 19NOV2018 121187     8.0N  125.0E 4.0-5.4 ABAAA  Central Philippines        

 

MODERATE QUAKE AND AFTERSHOCKS IN BAJA, SOUTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR NOVEMBER 19, 2018

 

A moderate earthquake of M 4.8 in northern Baja California was widely felt in that area today. This is the largest quake in this area since 2012. NEIC reported maximum intensity VI at Heber, California with IV in Calexico and in Mexicali, Baja California, Mexico. Intensity II-III was also reported from Pueta, Baja; San Luis Rio Colorado, Sonora, Mexico; Tecolotes, Baja; Somerton, Arizona, Holtville and El Centro, California among others. Several lighter aftershocks were also felt lightly in the epicentral area. These included an M 3.3 and several of M 3.5 felt with intensity II-III in Heber, Imperial and San Diego, California and in Yuma, Arizona. In precious issues this summary had noted a change in regional seismicity which was thought to be related to a significant regional upcoming event for example as:

 

"There is also a series of minor earthquakes occurring in the Channel Islands up into the valleys west of Los Angeles. This has been going on for several days. While these are minor quakes, they represent a change in the regional seismicity pattern which could be signifcant and are somewhat reminiscent of the earthquakes which preceded the Northridge quake of January 1994.  This summary will monitor this closely in the next several days." (November 18, 2018)

 

The M 4.8 is the strongest event in northern Baja or Southern California within  about 100 km of this epicenter since events of M 5.4 and 5.5 on August 26-27, 2012 about 100 km north of this and an M 4.9 on February 14, 2012 within about 25 km of today's series. Forecasts 121291 and  121287 had expected  this activity was likely in Mid-November. These epicenters are at 100 degrees from the Ionian Sea M 6.8 and at the third node (120 degrees) from the Minahasa M 7.5 of September 28 and may have been promoted from those source.

 

O: 19NOV2018 20:18:42  32.1N  115.3W Mw=4.8  EMSC   BAJA CALIFORNIA, MEXICO      

O: 20NOV2018 06:25:39  32.2N  115.2W ML=2.4  EMSC   BAJA CALIFORNIA, MEXICO      

O: 20NOV2018 06:16:51  32.2N  115.2W ML=3.0  EMSC   BAJA CALIFORNIA, MEXICO      

O: 20NOV2018 03:23:35  32.2N  115.3W ML=2.2  EMSC   BAJA CALIFORNIA, MEXICO      

O: 20NOV2018 03:39:06  32.2N  115.3W ML=2.3  EMSC   BAJA CALIFORNIA, MEXICO      

O: 20NOV2018 06:31:41  32.2N  115.3W ML=2.6  EMSC   BAJA CALIFORNIA, MEXICO      

O: 19NOV2018 20:25:01  32.2N  115.3W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO      

O: 19NOV2018 23:49:15  32.2N  115.3W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO      

O: 19NOV2018 23:51:19  32.2N  115.3W ML=3.5  EMSC   BAJA CALIFORNIA, MEXICO      

O: 20NOV2018 01:37:38  32.2N  115.3W ML=3.5  EMSC   BAJA CALIFORNIA, MEXICO      

O: 19NOV2018 20:57:19  32.3N  115.3W ML=2.6  EMSC   BAJA CALIFORNIA, MEXICO      

P: 21NOV2018 121287    30.2N  114.1W 2.0-3.9 ACAAA  SW U.S.A                   

 

O: 19NOV2018 21:47:53  32.3N  115.6W ML=2.7  EMSC   BAJA CALIFORNIA, MEXICO      

O: 19NOV2018 21:42:38  32.4N  116.3W ML=2.1  EMSC   BAJA CALIFORNIA, MEXICO      

O: 20NOV2018 03:35:51  32.5N  115.6W ML=2.6  EMSC   BAJA CALIFORNIA, MEXICO      

P: 14NOV2018 121291    32.9N  115.6W 2.5-4.4 CAAAA  So. California             

 

 

A moderate earthquake of M 4.1 also occurred in northwestern Washington State today. NEIC reported intensity II-III in Washington at Brinnon, Lilliwaup, Quinault, Hoodsport, Port Angeles, Dequim, Seabeck, Quilcene and Union and in general within about 150 km of the epicenter including at Olympia, Seattle,  and Gig Harbor. The last earthquake with M>=4.1 in the Olympic Peninsula, Washington was recorded on February 23, 2017 (M 4.1) and prior to that on December 30, 2015 (M 4.9). Forecast 121343 expected this event about 50 km to the northeast of this epicenter was likely around November 17. This may be related to activation of this region previously noted in this summary.

 

O: 19NOV2018 11:09:13  47.7N  123.6W ML=4.1  EMSC   OLYMPIC PENINSULA, WASHINGTON

P: 17NOV2018 121342    48.4N  123.2W 2.0-4.1 AAAAA  Washington state, U.S.     

 

A strong swarm of minor earthquakes also occurred in Sicily, Italy today. This may be associated with a continuing eruption at Mt. Etna. Forecast 121274 had  expected the area to be active in mid-November. These epicenters are at 102 - 103 degrees from the Minahasa M 7.5 of September 28 and may have been promoted from that source.

 

O: 20NOV2018 05:36:19  37.7N   14.9E ML=2.0  EMSC   SICILY, ITALY

O: 20NOV2018 05:39:51  37.7N   14.9E ML=2.0  EMSC   SICILY, ITALY

O: 20NOV2018 05:09:19  37.7N   14.9E ML=2.2  EMSC   SICILY, ITALY

O: 20NOV2018 04:55:19  37.7N   14.9E ML=2.3  EMSC   SICILY, ITALY

O: 20NOV2018 05:00:30  37.7N   14.9E ML=2.3  EMSC   SICILY, ITALY

O: 20NOV2018 05:29:27  37.7N   14.9E ML=2.3  EMSC   SICILY, ITALY

O: 20NOV2018 04:59:11  37.7N   14.9E ML=2.4  EMSC   SICILY, ITALY

O: 20NOV2018 05:44:40  37.7N   14.9E ML=2.4  EMSC   SICILY, ITALY

O: 20NOV2018 05:14:16  37.7N   14.9E ML=2.6  EMSC   SICILY, ITALY

O: 20NOV2018 05:38:43  37.7N   14.9E ML=2.7  EMSC   SICILY, ITALY

O: 20NOV2018 05:53:42  37.7N   14.9E ML=3.1  EMSC   SICILY, ITALY

O: 20NOV2018 05:21:37  37.7N   14.9E ML=2.0  EMSC   SICILY, ITALY                

O: 20NOV2018 05:06:34  37.7N   14.9E ML=3.5  EMSC   SICILY, ITALY                

P: 13NOV2018 121274    38.0N   14.0E 3.0-4.8 CAAAA  Mediterranean/Sicily       

P: 16NOV2018 121274    39.0N   14.0E 3.0-4.8 BBAAA  Mediterranean/Sicily       

 

 

The largest earthquake within the U.S. of Canada today - an  M 4.7 - hit east of Unimak, Alaska today in the Alaska Peninsula area. It was not reported felt in this remote area. This is the largest earthquake in this area within about 100 km of this epicenter since an M 5.4 on July 21, 2018. Forecast 121368 had expected this epicenter to be active within about 50 around November 19.

 

O: 20NOV2018 05:42:28  54.4N  161.4W mb=4.7  EMSC   ALASKA PENINSULA             

P: 19NOV2018 121368    54.7N  160.7W 3.5-4.9 AAAAA  Unimak Islands, Aleutians  

 

The strongest earthquake in the world today was an M 5.5 near the coast of northern Peru. IGP reported it was felt with intensity V in Casma and Huarmey, Chimbote, Peru. An aftershock of M 4.7 was felt in the same area with intensity III. No major damage or tsunami was associated with this quake. The last earthquake of M>=5.5 in northern Peru within about 200 km of this epicenter was an M 5.6 on April 26, 2015 and prior to that an M 6.0 on November 10, 2012. Forecast 121207 had expected this event was likely around November 14. This epicenter is at 103 degrees from the Ionian Sea quakes up to M 6.8 of October 25 and were probably promoted from that source.

 

O: 20NOV2018 06:38:05   9.8S   78.6W Mw=5.5  EMSC   NEAR COAST OF NORTHERN PERU  

O: 20NOV2018 07:26      9.9S   79.0W Mw=4.7  IGP    NEAR COAST OF NORTHERN PERU  

P: 14NOV2018 121207     9.0S   80.0W 4.0-5.6 CABAA  No. Peru                   

 

STRONG, DEEP FOCUS AFTERSHOCK STRIKES BENEATH FIJI

 

EARTHQUAKE SUMMARY FOR NOVEMBER 18, 2018

 

A strong earthquake of M 6.6-6.7 hit at a deep hypocenter today beneath Fiji. This is an  aftershock of the M 8.2 which struck the area on August 19, 2018. Due to the depth at about 533 km today's event did no damage at the surface and was not reported felt. No tsunami was generated from this deep earthquake. The last earthquake within about 200 km of this epicenter in Fiji occurred on September 30, 2018 (M 6.6) and the M 8.2 of August 19, 2018.  Forecast 121397 had expected this event within about 100 km was likely around November 18.

 

O: 18NOV2018 20:25:45  17.9S  178.9W Mw=6.6  EMSC   FIJI REGION                  

O: 18NOV2018 20:25:45  17.9S  178.9W mw=6.7  ANSS   SE of Lambasa Fiji

P: 18NOV2018 121397    18.0S  178.0W 4.0-5.8 AAAAA  Tonga Islands              

 

A series of moderate earthquakes also occurred on Ocean Ridges today. These regions often see a delayed response to strong geomagnetic storms.  Two of these occurred in the Svalbard region north of Norway with M 4.4. An event in the region occurred within minutes of local solar noon and was probably promoted by tidal stresses which maximize at this hour. Forecast 121380 had expected this activity was likely around November 21.

 

O: 18NOV2018 11:36:06  76.4N    7.2E mb=4.4  EMSC   SVALBARD REGION              

P: 21NOV2018 121380    74.0N   14.0E 3.0-4.6 BCAAA  Norway                     

 

O: 19NOV2018 04:14:00  85.1N   11.9E mb=4.4  EMSC   NORTH OF SVALBARD            

 

O: 18NOV2018 19:48:47  35.4S  105.7W mb=4.8  EMSC   SOUTHERN EAST PACIFIC RISE   

 

A set of earthquakes also occurred in the northern Mid-Atlantic with M 5.0 and 4.7. Theses events were not reported felt in this remote areas. The M 5.0 off the northern African coast was the strongest within about 200 km of this epicenter since an M      5.1 on January 26, 2018 and prior to that an M 5.7 on October 20, 2016. Forecast 121229 had expected this event was likely within about 100 km of the epicenter around November 20. 

 

O: 18NOV2018 16:04:23  15.0N   45.1W mb=5.0  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 20NOV2018 121229    15.0N   46.0W 4.0-5.6 AAAAA  Mid-Atlantic Ridge         

 

The northern event of this set occurred aas an M 4.7 south of the Reykjanes Ridge in the North Atlantic Ocean. It is the largest within aboug 200 km of this epicenter since an M 4.7 on November 7, 2018 and prior to that as an M 5.1 on August 14, 2017. Forecast 121359 had expected this event was likely around November 18 within about 100 km of this epicenter.

 

O: 18NOV2018 11:34:40  48.9N   28.1W mb=4.7  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 18NOV2018 121359    50.0N   29.0W 4.0-5.6 ABAAA  North Mid-Atlantic Ridge   

 

Two other ocean ridge events occurred east of Africa in the Mayotte region and  in the Red Sea. Both of these had magnitude M 4.5. Mayotte has been active in recent months but seismicity in the area has been on the decline in recent weeks. The last earthquake of M>=4.5 in this area occurred on November 7, 2018.  Similar events occurred October 16 and October 7, 2018. The Moyotte activity began shortly after the Hawaiian eruption this spring which are nearly antipodal to Mayotte, Energy from Hawaii may have helped promote the Mayotte activity.   Forecast 121387 had expected this event was likely within about 100 km of the epicenter around November 15.

 

O: 19NOV2018 03:37:22  13.0S   45.5E mb=4.5  EMSC   MAYOTTE REGION               

P: 15NOV2018 121387    12.0S   45.0E 3.0-5.0 BAAAA  Madagascar area             

 

An M 4.5 in the Red Sea region east of northern Africa was not reported felt in that region. This is an active epicenter, the last event of M>=4.5  within  about 200 km was an M 4.5 on April 9, 2016. The only event of M>4.5 in the

past 10 years was an M 5.3 on December 23, 2013.   Forecast 121238 had expected this event within about 100 km of this epicenter was likely around November 20.

 

O: 19NOV2018 01:10:27  19.6N   38.7E mb=4.5  EMSC   RED SEA                      

P: 20NOV2018 121238    19.0N   39.0E 3.0-5.1 AAAAA  Sudan                      

 

MINOR ACTIVITY MAY SIGNAL SEISMIC CHANGES

 

EARTHQUAKE SUMMARY FOR NOVEMBER 17, 2018

 

Several minor series of earthquakes over the past several days may indicate changes in global seismicity approaching. An unusual series of minor earthquakes hit central Hawaii today. These events were reported felt in Captain Cook, Hawaii with intensity II-III. These events are near Mauna Loa Volcano on the big island of Hawaii. Reawakening of this volcano could be the next step in the changes in seismicity and volcanism in Hawaii which began earlier this year.

 

O: 18NOV2018 02:25:03  19.5N  155.7W ML=2.9  EMSC   ISLAND OF HAWAII, HAWAII     

P: 21NOV2018 121225    18.8N  155.2W 3.0-4.4 AAAAA  Hawaii                     

 

There is also a series of minor earthquakes occurring in the Channel Islands up into the valleys west of Los Angeles. This has been going on for several days. While these are minor quakes, they represent a change in the regional seismicity pattern which could be significant and are somewhat reminiscent of the earthquakes which preceded the Northridge quake of January 1994.  This summary will monitor this closely in the next several days.

 

O: 18NOV2018 01:07:35  34.3N  119.8W ML=2.2  EMSC   SANTA BARBARA CHANNEL, CALIF.

P: 13NOV2018 121292    33.8N  119.7W 2.5-4.4 BAAAA  So. California             

 

O: 17NOV2018 18:32:39  35.5N  121.3W MD=2.8  EMSC   OFFSHORE CENTRAL CALIFORNIA  

P: 16NOV2018 121285    35.6N  121.3W 2.5-4.6 AAAAA  Off So. California         

 

The strongest earthquake in the world today was an M 5.4 in the Komandorsky Islands of Russia. This continues the activation of seismicity at high latitudes noted in previous issues of this summary. It was not reported felt in this remote area. The last earthquake of M>=5.4 in the Komandorsky Islands within about 200 km  of today's epicenter was an M 6.2 on January 25, 2018. Today's event is the second strongest aftershock of the major M 7.7 of July 17, 2017 since July, 2017. Forecast 121357 had expected this event was likely to the southeast around November 15.

 

O: 17NOV2018 14:39:51  54.5N  168.6E Mw=5.4  EMSC   KOMANDORSKIYE OSTROVA REGION 

P: 15NOV2018 121357    53.0N  171.0E 4.0-5.8 ABBAA  Near Islands               

 

The strongest seismic activity in the U.S. or Canada today continued in the  Pribilof Islands of Alaska where quakes of M 3.8 and 4.1 were registered. This summary had noted this activity when an M 4.3 hit the region late yesterday as:

 

"An unusual earthquake of M 4.3 also hit north of the Fox Islands in the Pribilof Islands, Alaska today. It was not reported felt. While there is occasional seismic activity in the Pribilof area, it is not common. The last earthquake within about 150 km of today's epicenter with M>=4.3 occurred as an M 4.4 on June 14, 2017 and prior to that as a swarm to the west in late January and early February 2015 with maximum events of M 5.0-5.5. Prior to that the area had experienced an event of M>=4.3 on four other occasions since 1990. Forecast 121355 had expected this activity to the south around November 17."  (November 16-17, 2018)

 

O: 17NOV2018 09:57:00  56.5N  168.7W ML=4.1  EMSC   PRIBILOF ISLANDS, ALASKA REGIO

O: 17NOV2018 17:22:43  56.7N  168.6W ML=3.8  EMSC   PRIBILOF ISLANDS, ALASKA REGIO

P: 17NOV2018 121355    53.9N  165.3W 3.5-5.1 ACBAA  Fox Islands, Aleutians     

 

Tropical Depression 33W formed east of the Philippines today with winds up to 35 kts. It is expected to track to the west reaching Mindanao around November 19-20. The area is seismic and a moderate to large regional earthquake could be promoted at this time by stresses associated with landfall of this storm.

 

REDUCED SEISMICITY CONTINES IN SOUTHERN HIGH LATITUDES

 

EARTHQUAKE SUMMARY FOR NOVEMBER 16, 2018

 

The strong earthquakes in high southern latitudes continued today at more unusual epicenters and with smaller magnitudes. The largest earthquake of the day was an M 5.2 south of the South Sandwich Islands. A series to the west of this in the Drake Passage between Antarctica and South America. The earthquake in the area south of the South Sandwich Islands was probably a result of stress redistribution following the M 6.4 in the South Sandwich Islands yesterday. Today's event, like most in the region was not reported felt. It is the strongest event within about 250 km of today's epicenter since an M 5.4 on September 24, 2018. It is the largest event within about 140 km of this epicenter in the past 30 years. No quakes south of 61S latitude with M>=5.2 since at least 1990. It occurred within minutes of local solar noon and was probably promoted by high tidal stresses which maximize at this hour. Forecast 121183 had expected an event about 100 km north of this was likely around November 10.

 

O: 16NOV2018 13:34:11  62.1S   26.3W mb=5.2  EMSC   SOUTHWESTERN ATLANTIC OCEAN  

P: 10NOV2018 121183    61.0S   26.0W 4.0-5.6 CBAAA  Southern  Ocean            

 

The swarm in the Drake Passage with events of M 5.2, 4.9 and 4.9 follows a similar swarm on October 29-31 which began with an M 6.3. None of today's events were reported felt in this remote area. The third node (120 degrees) was especially active today.

  

O: 16NOV2018 17:43:36  57.4S   66.0W mb=4.9  EMSC   DRAKE PASSAGE                

O: 16NOV2018 07:53:01  57.6S   66.0W Mw=5.2  EMSC   DRAKE PASSAGE                

O: 16NOV2018 07:19:11  57.6S   66.1W mb=4.9  EMSC   DRAKE PASSAGE                

 

In addition to the Drake Passage events, the strongest global activity today was aftershocks of the M 6.3 in the Solomon Islands yesterday. The largest of these was an M 5.2. Forecasts 121389 and 121398 had expected this activity in mid-November. In the previous summary it was noted in this regard:

 

"An M 6.2 quake also hit the Solomon Islands today near the geomagnetic equator and may have been promoted by induced telluric currents by equatorial ionospheric ring currents. It was not reported felt in this area. The last earthquake within about 200 km of this epicenter with M>=6.2 occurred on September 9, 2018 (M 6.5) and prior to that on January 19, 2017 (also M 6.5). The last such event within about 150 km of this epicenter was an M 6.6 on August 15, 2015. Forecast 121389 had expected today's epicenter would be active around November 13 within about 100 km." (November 15-16, 2018)

 

 

O: 16NOV2018 21:19:45  10.4S  163.3E mb=4.5  EMSC   SOLOMON ISLANDS              

O: 16NOV2018 10:17:03  10.4S  163.3E mb=4.9  EMSC   SOLOMON ISLANDS              

O: 16NOV2018 21:35:00  10.5S  163.2E mb=4.9  EMSC   SOLOMON ISLANDS              

O: 16NOV2018 17:11:22  10.9S  163.5E Mw=5.2  EMSC   SOLOMON ISLANDS              

P: 13NOV2018 121389    10.0S  162.0E 4.0-5.5 BABAA  No. of Santa Cruz Islands  

P: 19NOV2018 121398    11.0S  165.0E 4.0-5.4 BABAA  Vanuatu Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the western Andreanof Islands, Aleutians, Canada. It was not reported felt in this remote area. The last earthquake in the Andreanof Islands within about 150 km and with M>=4.6 was an M 4.8 on September 27, 2018. Strong quakes hit about 150 km east of this on August 15 (M 6.6) and August 23 (M 6.3), 2018.  Forecast 121348 expected today's event was likely around November 16.

 

O: 16NOV2018 09:44:07  50.1N  179.9W mb=4.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 16NOV2018 121349    50.9N  179.0W 3.5-5.0 AAAAA  Andreanoff Isls, Aleutians 

 

An unusual earthquake of M 4.3 also hit north of the Fox Islands in the Pribilof Islands, Alaska today. It was not reported felt. While there is occasional seismic activity in the Pribilof area, it is not common. The last earthquake within about 150 km of today's epicenter with M>=4.3 occurred as an M 4.4 on June 14, 2017 and prior to that as a swarm to the west in late January and early February 2015 with maximum events of M 5.0-5.5. Prior to that the area had experienced an event of M>=4.3 on four other occasions since 1990. Forecast 121355 had expected this activity to the south around November 17.

 

O: 16NOV2018 23:56:02  56.7N  168.6W mb=4.3  EMSC   PRIBILOF ISLANDS, ALASKA REGIO

P: 17NOV2018 121355    53.9N  165.3W 3.5-5.1 ACBAA  Fox Islands, Aleutians     

 

STRONG EARTHQUAKES HIT AT HIGH LATITUDES

 

EARTHQUAKE SUMMARY FOR NOVEMBER 15, 2018

 

A series of strong earthquakes hit high latitudes today in Antarctic-Pacific Ridge; and the South Sandwich Islands (M 6.3-6.4). These were joined by enhanced high-latitude seismicity off the coast of Oregon, Idaho and the Ionian Sea among others. These were accompanied by an M 6.2 in Kamchatka yesterday and by an M 6.3 in the Solomon Islands today near the geomagnetic equator. When the earth is bombarded from particles from CME on the sun, many of these follow magnetic lines towards the northern and southern geomagnetic poles. They  can be seen in high latitude visual displays such as the northern lights and enhance ring currents in the ionosphere. This, in turn can help promote seismicity in high and low latitudes zones. This had been anticipated in the prior summary as:

 

"The strongest earthquake in the world today was an M 6.1 in Kamchatka, Russia. It was followed by an M 5.0 aftershock about 8 minutes later ....  Continuing strong and moderate earthquakes at high latitudes such as this suggests the effects of the past geomagnetic storm have not completely dissipated and that more moderately large to large quakes may occur at high latitudes in the next several days. The antipode to Kamchatka is the South Sandwich Islands which have been active in the past two weeks and could see another strong event in the next couple of days. Other active high-latitude seismicity this week has included strong earthquakes in the Jan Mayen Island area and in the southern Oceans. The effects of the geomagnetic storm had been expected through November 13 in previous summaries but are now extended to last through November 16 as previously noted in this summary:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 10. High latitude geomagnetic field also saw disturbed conditions  with AP at 15. This continues the strongest geomagnetic storm since October 8 when high latitude AP reached 53. KP of 6 was seen in early November 5. Seismicity near the geomagnetic equator and at high latitudes is expected to to be enhanced during the period November 8-13." (November 6-13, 2018)

 

The strongest of today's earthquakes was an M 6.4 in the South Sandwich Islands. It was not reported felt and was preceded by an M 5.4 foreshock and aftershocks of M 5.4, 4.8 and 4.8 among others. This is close to antipodal with the M 6.1

in Kamchatka yesterday and may have been promoted by energy from that strong quake. The South Sandwich Islands area at 103 degrees from the Ionian Sea as well, another potential source of promotional energy for this series. The South Sandwich Islands have been active in the past several weeks but the last event in the area of M>=6.4 was an M 6.5 on May 10, 2017 and prior to that an M 7.2 on May 28, 2016. Forecast 121428 had expected today's activity within about 100 km of these epicenters was likely around November 13. These occurred at 103 degrees from the series of events in the Ionian Sea and from the great quakes in Fiji.

 

O: 16NOV2018 05:25:25  56.5S   25.2W mb=4.8  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 16NOV2018 05:01:06  56.6S   25.2W mb=4.8  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 16NOV2018 04:18:13  56.7S   25.3W mb=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 15NOV2018 20:02:22  56.9S   25.6W Mw=6.4  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 15NOV2018 16:49:41  56.9S   25.7W Mw=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 13NOV2018 121428    56.0S   26.0W 4.0-5.8 AAAAA  So. Sandwich Islands       

 

A strong earthquake of M 6.3 also occurred on the Southern East Pacific Rise between Antarctica and the South Pacific Ocean today. It was not reported felt in this remote area. The last earthquake within about 250 km of this epicenter with M>=6.3 occurred on August 6, 2001 with M 6.7. Two other such earthquakes have occurred in the area in the past 30 years - an M 6.3 on September 8, 1995 and an M 6.3 on October 13, 1991.  Forecast 121427 had expected today's epicenter would be active within about 30 km of this epicenter around November 17. This epicenter is at 104 degrees from Minahasa and may have been promoted from that source.

 

O: 15NOV2018 23:09:03  56.3S  122.1W Mw=6.3  EMSC   SOUTHERN EAST PACIFIC RISE   

P: 17NOV2018 121427    56.0S  122.0W 4.0-5.6 AAAAA  Pacific-Antarctic Ridge    

 

An M 6.2 quake also hit the Solomon Islands today near the geomagnetic equator and may have been promoted by induced telluric currents by equatorial ionospheric ring currents. It was not reported felt in this area. The last earthquake within about 200 km of this epicenter with M>=6.2 occurred on September 9, 2018 (M 6.5) and prior to that on January 19, 2017 (also M 6.5). The last such event within about 150 km of this epicenter was an M 6.6 on August 15, 2015.  Forecast 121389 had expected today's epicenter would be active around November 13 within about 100 km.

 

O: 16NOV2018 05:03:44  10.4S  163.3E mb=4.9  EMSC   SOLOMON ISLANDS              

O: 16NOV2018 03:26:54  10.6S  163.1E Mw=6.2  EMSC   SOLOMON ISLANDS              

P: 13NOV2018 121389    10.0S  162.0E 4.0-5.5 BAAAA  No. of Santa Cruz Islands  

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the Unimak area of Alaska. NEIC reported it was felt with intensity II-III in Unalaska and Akutan, Alaska. The last earthquake with M>=4.6 within about 150 km of this epicenter occurred on October 12, 2018 (M 4.7) and prior to that as an M 4.6 on July 9, 2018. Forecast 121368 had expected this event in this region was likely around November 13.

 

 

O: 15NOV2018 18:13:25  53.8N  166.2W mb=4.6  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 13NOV2018 121368    54.2N  165.0W 3.5-5.1 AAAAA  Unimak Islands, Aleutians  

 

An unusually large M 4.0 also shook southern Idaho today in the Soda Springs area. NEIC reported this earthquake of M 3.8-4.0 in Idaho was felt with intensity II-III in the area(s) of Idaho at Soda Springs, Grace, Montpelier and Afton. A series of moderate earthquakes up to M 5.3 hit the area beginning on September 2, 2017 but this is the strongest aftershock in the area since events of M 4.3 on January 26, 2018 and M 4.1 on October 11, 2017. Forecast 121343 had expected this activity within about 25 km of the epicenter was likely around November 15. This epicenter is at the seventh node from strong recent earthquakes in Jan May Island and Venezuela and was probably promoted from those sources.

 

O: 15NOV2018 07:13:26  42.7N  111.5W ML=2.2  EMSC   SOUTHERN IDAHO               

O: 15NOV2018 09:33:12  42.7N  111.5W ML=4.0  EMSC   SOUTHERN IDAHO               

P: 15NOV2018 121343    43.0N  111.5W 2.0-4.1 AAAAA  Yellowstone/Wyoming        

 

Other notable seismicity today included a series of moderate earthquakes off the coast of Oregon. These may have been felt lightly on the Oregon coast. They may be part of the activity at volcanic centers in the Pacific Northwest of the U.S. noted in the previous issue of this summary and probably occurred in volcanic areas off the coast of Oregon. The largest of these events (M 4.5) was surpassed in magnitude by an M 6.2 about 150 km northwest of this epicenter on August 22, 2018. Forecast 121330 had expected this activity within about 50 km of these epicenters was likely around November 20.

 

O: 16NOV2018 05:10:00  42.3N  126.7W mb=3.9  EMSC   OFF COAST OF OREGON          

O: 16NOV2018 05:19:19  42.3N  126.9W mb=4.1  EMSC   OFF COAST OF OREGON          

O: 16NOV2018 06:41:40  42.4N  126.5W mb=3.8  EMSC   OFF COAST OF OREGON          

O: 16NOV2018 05:21:58  42.4N  126.6W mb=4.5  EMSC   OFF COAST OF OREGON          

P: 20NOV2018 121330    43.1N  126.5W 3.0-4.4 BAAAA  Off Coast of Oregon        

 

The area of storminess in the Dominican Republic helped promote one more earthquake today before dissipating. This was an M 3.8 in the Dominican Republic. The epicenter had been expected to see activity between November 14 and 17 (forecasts 121241 and 121236).  The last earthquake of M>=3.8 within about 100 km of this epicenter was an M 4.0 on August 25, 2018.

 

NEIC reported this earthquake of M 3.8 in the Dominican Republic was felt with intensity II-III in the area(s) of Samana, Dominican Republic.

 

O: 15NOV2018 12:14:24  19.4N   69.3W ML=3.8  EMSC   DOMINICAN REPUBLIC REGION    

P: 14NOV2018 121241    20.0N   69.0W 3.0-4.5 AAAAA  Bahamas/No. Caribbean      

P: 17NOV2018 121236    19.0N   69.0W 3.4-4.9 AAAAA  Puerto Rico                

 

STRONG EARTHQUAKE SHAKES KAMCHATKA

 

EARTHQUAKE SUMMARY FOR NOVEMBER 14, 2018

 

The strongest earthquake in the world today was an M 6.1 in Kamchatka, Russia. It was followed by an M 5.0 aftershock about 8 minutes later. The last earthquake of M>=6.1 in Kamchatka within about 250 km of this epicenters occurred March 29, 2017 with M 6.6 and prior to that as an M 6.4 on March 20, 2016 after a three year lull in seismic activity at the M>=6.1 level.

Forecast 121353 had expected this event was likely around November 18 within about 25 km of this epicenter. Continuing strong and moderate earthquakes at high latitudes such as this suggests the effects of the past geomagnetic storm have not completely dissipated and that more moderately large to large quakes may occur at high latitudes in the next several days. The antipode to Kamchatka is the South Sandwich Islands which have been active in the past two weeks and could see another strong event in the next couple of days. Other active high-latitude seismicity this week has included strong earthquakes in the Jan Mayen Island area and in the southern Oceans. The effects of the geomagnetic storm had been expected through November 13 in previous summaries but are now extended to last through November 16 as previously noted in this summary:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 10. High latitude geomagnetic field also saw disturbed conditions  with AP at 15. This continues the strongest geomagnetic storm since October 8 when high latitude AP reached 53. KP of 6 was seen in early November 5. Seismicity near the geomagnetic equator and at high latitudes is expected to to be enhanced during the period November 8-13." (November 6-13, 2018)

 

O: 14NOV2018 21:21:50  55.7N  162.1E Mw=6.1  EMSC   NEAR EAST COAST OF KAMCHATKA 

O: 14NOV2018 21:29:37  55.8N  162.0E mb=5.0  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 18NOV2018 121353    56.0N  162.0E 4.0-5.5 BAAAA  E. of Kamchatka            

 

The area of storminess and clouds which has been associated with several large and unusual earthquakes occurring under the eye in the past week moved in the Dominican Republic today where quakes of M 3.3, 3.2 and 3.3 occurred under the eye. It would be interesting to check this weather phenomena for anomalous behavior to see if there is a particular aspect which is triggering these earthquakes.  NEIC reported this earthquake of M 3.3 in the Dominican Republic was felt with intensity II-III in the area(s) of San Juan, Puerto Rico.

 

O: 15NOV2018 02:54:43  19.3N   68.4W MD=3.3  EMSC   DOMINICAN REPUBLIC REGION    

O: 15NOV2018 01:38:29  19.3N   68.5W Md=3.2  EMSC   DOMINICAN REPUBLIC REGION    

O: 15NOV2018 01:50:56  19.3N   68.7W MD=3.3  EMSC   DOMINICAN REPUBLIC REGION    

P: 14NOV2018 121236    19.0N   68.0W 3.4-5.6 AAAAA  Puerto Rico                

 

A moderately large aftershock of M 5.6 was widely felt in the Sulawesi, Indonesia today. NEIC reported this earthquake of M 5.6 in Sulawesi, Indonesia was felt with intensity II-III in the area(s) of Singkang, Sulawesi and Kuta, Bali, Indonesia. BMG reported the M 5.5-5.6 was felt with intensity IV in Mamasa and Toraja and III in Mamuju and Majene,  Sulawesi, Indonesia.  Other aftershocks today were felt with intensity up to IV in Mamasa and other areas of Sulawesi. This may also have been triggered by high tidal stresses and geomagnetic effects. This is the strongest far-term aftershock in Sulawesi since the initial swarm that followed the M 7.5 on September 28, 2018. Forecast 121213 had expected today's activity was likely in Sulawesi around November 15. This summary had expected high tides associated with the new moon could enhance seismicity in Sulawesi at this time as:

 

"The new moon arrived on November 7, 2018 at 16:02 UT. Longitudes which were sub-solar at this time are near 60W with those anti-solar at 120E. This includes much of the Caribbean and the western Pacific Rim from Indonesia (Sulawesi) north to Japan. These regions (among others) are likely to see increased tidal promotion during the coming week." (November 5-10, 2018)

 

O: 14NOV2018 23:01:20   2.9S  119.4E Mw=5.6  EMSC   SULAWESI, INDONESIA          

O: 14NOV2018 21:20:39  03.0S  119.4E MS=4.3  BMG  Felt with intensity III

O: 14NOV2018 23:01:20  02.9S  119.4E MS=5.5  BMG  Felt with intensity IV

O: 14NOV2018 23:10:07  02.9S  119.5E MS=4.5  BMG  Felt with intensity II

O: 14NOV2018 23:25:16  02.9S  119.5E MS=4.3  BMG  Felt with intensity II

O: 14NOV2018 23:36:41  02.6S  119.5E MS=4.2  BMG  Felt with intensity II

O: 15NOV2018 03:55:02  02.9S  119.5E MS=5.0  BMG  Felt with intensity IV

O: 15NOV2018 03:55:06   2.9S  119.4E mb=4.7  EMSC   SULAWESI, INDONESIA          

O: 14NOV2018 23:31:24   3.0S  119.4E mb=4.8  EMSC   SULAWESI, INDONESIA          

P: 15NOV2018 121213     1.0S  122.0E 4.0-5.6 ABBAA  Sulawesi area              

 

 

A reader has noted an interesting series of volcanic earthquakes in the Pacific Northwest of the U.S. These consist of minor events under nearly each of the regional volcanoes. This could be due to a regional stress wave passing through the area. Such stress waves can help trigger larger regional earthquakes such as occurred off Vancouver, B.C. and the coast of Oregon. If this is the case these areas may see elevated seismicity in the next several days.

 

MODERATE VIRGIN ISLANDS QUAKE ASSOCIATED WITH CONTINUING WEATHER DISTURBANCE

 

EARTHQUAKE SUMMARY FOR NOVEMBER 13, 2018

 

An unusual earthquake of M 4.9 occurred in the Virgin Islands today. NEIC reported this earthquake of M 4.9 in the Virgin Islands was felt with intensity II-III in the area(s) of San Juan, Puerto Rico. This event occurred while the eye of the tropical disturbance (unnamed)  was passing over this epicenter. This disturbance had the same relation to an M 6.3 in the North Atlantic Ocean two days ago as noted in this summary at the time:

 

"A strong M 6.2 quake was reported in the area east of Barbuda, Leeward Islands today. The National Hurricane Center (NHC) shows an area of storminess over this epicenter which has persisted for the past two days. This system was located at 15N 50W when the M 6.2 reportedly occurred today also at 15N 50W. NHC gives this a 30% probability of becoming a Tropical Depression in the next two days and 70% in the next five days. It is expected to track to the west reaching Puerto Rico in the next several days as a Tropical Depression." (November 11-12, 2018)

 

It is highly unusual for the eye of a storm such as this to trigger two moderate to large earthquakes directly beneath it in such a short period of time. This summary had expected this in the previous issue as:

 

"NHC shows an area of storminess over the Leeward Islands which has persisted for the past three days. This system is located at 15N 62W and expected to track to the west.  NHC gives this a 30% probability of becoming a Tropical Depression in the next two days and 70% in the next five days. It is expected to track  to the west reaching Puerto Rico in the next several days as a Tropical Depression.

Seismicity is expected to be enhanced in the area during this time." (November 12-13, 2018)

 

The last earthquake within about 150 km of the epicenter of the M 4.9 today occurred January 13, 2014 in Puerto Rico as an M 6.4 about 140 km to the west of today's epicenter. The continuing activity in this region over the past week may suggest an upcoming strong regional earthquake such as that of January, 2014. Forecast 120983 expected today's activity was likely around November 11 within  about 50-100 km of the epicenter.

 

NEIC reported an earthquake of M 3.2 in Puerto Rico was felt with intensity II-III in the area(s) of Guaynabo, Puerto Rico.

 

O: 13NOV2018 08:21:46  19.3N   66.3W MD=3.2  EMSC   PUERTO RICO REGION           

O: 14NOV2018 00:10:33  19.6N   65.1W mb=4.9  EMSC   VIRGIN ISLANDS REGION        

P: 11NOV2018 120983    19.0N   66.0W 3.4-5.0 AAAAA  Puerto Rico                

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in Central Alaska. It was followed by an M 3.8 aftershock.  This earthquake of M 4.1 was widely felt in central Alaska today. NEIC reported intensity IV in Manley Hot Springs, Clear, Fairbanks, Healy, Fort Wainwright, North Pole, Alaska. NEIC reported an aftershock of M 3.8 in Central Alaska was felt with intensity II-III in the area(s) of Manley Hot Springs, Clear, Anderson and Fairbanks, Alaska.

The last earthquake within about 150 km of this epicenter in Central Alaska with M>=4.1 occurred on October 27, 2018 about 100 km northwest of today's epicenter with M 5.3. The last such event less than 100 km from today's epicenter was an M 4.6 on August 28, 2018. Forecast 121128 had expected today's activity was likely around November 9 to the south.

 

O: 14NOV2018 06:25:02  64.8N  150.9W ML=3.8  EMSC   CENTRAL ALASKA                

O: 13NOV2018 15:26:42  64.8N  151.0W ML=4.1  EMSC   CENTRAL ALASKA               

P:  9NOV2018 121128    63.3N  151.0W 3.2-5.1 BBAAA  Central Alaska             

 

MODERATELY STRONG QUAKE IN CENTRAL EAST PACIFIC RISE

 

EARTHQUAKE SUMMARY FOR NOVEMBER 12, 2018

 

Effects from the geomagnetic storm of recent days and from the new moon tides were on the wane today. The strongest earthquake of the day in the world, however, was near the equator. It occurred in the Central East Pacific Rise as a moderately large event of M 5.6 but was not reported felt in this remote area south of Mexico. The last earthquake of M>=5.6 within about 250 km of this epicenter occurred on October 29, 2018 with M 5.8 about  300 km southwest of today's epicenter. The last such event within about 150 km of today's event was an M 5.7 on July 23, 2007. Forecast 120947 had expected a moderate to large earthquake in this area in early November.

 

 

O: 12NOV2018 22:37:26   3.1S  103.5W Mw=5.6  EMSC   CENTRAL EAST PACIFIC RISE    

P:  4NOV2018 120947     5.0S  105.0W 4.0-5.7 CBBAA  No. East Pacific Rise      

 

There were no earthquakes with M>3 in the U.S. or Canada today.

 

STRONG EARTHQUAKE; STORM REPORTED EAST OF LEEWARD ISLANDS

 

EARTHQUAKE SUMMARY FOR NOVEMBER 11, 2018

 

A strong M 6.2 quake was reported in the area east of Barbuda, Leeward Islands today. The National Hurricane Center (NHC) shows an area of storminess over this epicenter which has persisted for the past two days. This system was located at 15N 50W when the M 6.2 reportedly occurred today also at 15N 50W. NHC gives this a 30% probability of becoming a Tropical Depression in the next two days and 70% in the next five days. It is expected to track  to the west reaching Puerto Rico in the next several days as a Tropical Depression.

 

There is a distinct possibility that the reported M 6.2 in the North Atlantic is a mistaken epicenter determination from seismic energy associated with this storm. But it is also possible that the storm triggered a landslide or in some other way triggered an M 6.3 earthquake. The sources of this data (EMSC and NEIC) will have to determine that from the data available. As there are two independent, determinations from separate networks, the likelihood that it is a real earthquake triggered by the regional storm is enhanced. NEIC reported it was felt up to 1000 km away in Crane, Saint Philip and Bridgetown, Saint Michael, Barbados and in Cayene, French Guinea. This also enhances the probability it was a real event, but felt reports can also be in error especially at this distance from an epicenter. The location of this epicenter is on the outer rise to the Leeward Islands. It could be an outer rise earthquake which would suggest the possibility of a strong Leeward Islands quake in the near-term. It is also interesting that this event occurred at 11 Local time on 11-11, the same time as the 100th anniversary of the end of WWI to the hour. I  either case this set of events illustrates the close connection between reported seismicity and strong weather phenomena.

 

The last earthquake of M>=6.2 within about 300 km of this epicenter in the  North Atlantic Ocean occurred more than 30 years ago. The last earthquake of  M>=4 in the region was an M 6.0 about 300 km south of this on July 27, 2017. That event, the first such in the region since 2008 was followed by moderate aftershocks in August and October, 2017. An earthquake of M 5.1 also occurred January 26, 2018 about 250 km northeast of today's epicenter.  Forecast 120976 had expected a moderately large regional event was likely around November 8, 2018.

 

Tidal stresses associated with the new moon may also have helped promote today's strong Atlantic quake. This summary had previously noted the area was subject to strong tidal triggering at this time as:

 

 

"The new moon arrived on November 7, 2018 at 16:02 UT. Longitudes which were sub-solar at this time are near 60W with those anti-solar at 120E. This includes much of the Caribbean and the western Pacific Rim from Indonesia (Sulawesi) north to Japan. These regions (among others) are likely to see increased tidal promotion during the coming week." (November 5-10, 2018)

 

This epicenter is at the fifth node (72 degrees) from the swarm in Vancouver of late October and at the sixth node from the Jan Mayen quake of November 9 (M  6.8) and may have been promoted by energy from those sources.

 

O: 11NOV2018 14:04:00  15.6N   50.0W Mw=6.3  EMSC   NORTH ATLANTIC OCEAN         

O: 11NOV2018 14:03:59  15.6N   49.9W mb=6.2  ANSS   North Atlantic Ocean"

P:  8NOV2018 120976    17.0N   47.0W 4.0-5.7 BBCAA  Mid-Atlantic Ridge         

 

The M 6.3 was followed later in the day by an M 4.4 in the Dominican Republic. NEIC reported this event was felt with intensity II-III in the Dominican Republic at Altamira Puerto Plata, Villa Gonzalez, Palmar Arriba, Santiago, Sosua and Tamboril. At M 4.4 this is the largest Dominican Republic event since an M 5.9 on October 7, 2018 about 250 km northwest of today's epicenter. The last within about 100 km was an M 4.4 on September 23, 2018.  Forecast 120988 had expected this was likely within about

 

O: 11NOV2018 18:02:51  19.8N   70.9W mb=4.4  EMSC   DOMINICAN REPUBLIC           

P:  8NOV2018 120988    20.0N   71.0W 3.0-4.7 BAAAA  Bahamas/No. Caribbean      

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in the eastern Andreanof Islands, Alaska. It was not reported felt in this remote area. The last earthquake within about 150 km of this epicenter with M>=4.3 was an 4.6 on October 31, 2018 and prior to taht an M 4.6 on August 6, 2018. Forecast 121105 had expected this event was likely within about 50 km around November 9.

 

O: 11NOV2018 16:49:58  52.6N  174.5W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  9NOV2018 121105    52.3N  174.6W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

ACTIVATION OF CALIFORNIA CONTINUES

 

EARTHQUAKE SUMMARY FOR NOVEMBER 10, 2018

 

Over the past several days a number of events in the M 3.5-4.0 range have occurred in the State of California. Today, a light earthquake of M 3.5 in the area of San Francisco, California was widely felt today. NEIC reported intensity IV in Crockett, Port Costa, Vallejo and II-III in Rodeo, Hercules, Benicia, Martinez, El Sobrante, American Canyon, Richmond, El Cerrito, Concord, Pleasant Hill, Richmond, Berkeley, Oakland, Novato, and within about 100 km of the epicenter. Several aftershocks were also felt in the area of Vallejo, Benicia, Richomd, Pleasant Hill, Berkeley etc. The mainshock and M 2.7 aftershock occurred within about 10 minutes of local solar midnight, a time when tidal stresses are maximized and may have helped promoted today's activity. The last earthquake in the San Francisco Bay area within about 50 km of today's epicenter with M>=3.5 occurred on July 30, 2018 (M 3.7) and prior to that an M 3.5 on May 15, 2018.  Forecast 121014 had expected this area would be active around November 7.

 

O: 10NOV2018 20:01:08  38.1N  122.2W MD=2.7  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 10NOV2018 19:56:02  38.1N  122.2W Mw=3.5  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 10NOV2018 20:14:03  38.3N  122.3W MD=2.4  EMSC   NORTHERN CALIFORNIA

O: 10NOV2018 11:18:56  38.0N  122.3W MD=2.0  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P:  7NOV2018 121014    37.7N  121.9W 2.5-4.4 BAAAA  Central California         

 

An earthquake of M 3.5 also occurred in Central California near Hollister. NEIC reported it was felt with intensity II-III in Gonzales, Hollister, Salinas, Soledad, Aromas, Carmel Valley, Seaside and Monterey and in general within about 100 km of the epicenter. This area has seen several similar events in the past week. It is a slipping section of the San Andreas Fault zone where a large earthquake is unlikely. The last earthquake of M 3.5 or greater in this area of Central California within about 50 km of today's epicenter occurred November 2 with M 4.1. This is probably and aftershock of that event.  Forecast 121012 had expected this area to be active around November 8.

 

O: 10NOV2018 21:09:32  36.7N  121.3W MD=2.3  EMSC   CENTRAL CALIFORNIA           

O: 10NOV2018 14:11:54  36.7N  121.3W Mw=3.5  EMSC   CENTRAL CALIFORNIA           

P:  8NOV2018 121012    36.4N  121.0W 2.5-4.5 AAAAA  Central California         

 

A series of earthquakes also occurred today in the region of India, Bangladesh and Pakistan. The largest was an M 5.2 was also felt in India today. NEIC reported intensity up to IV in India at Manipur, Mizoram, Assam, and Bangladesh. No major damage or casualties were reported. These events may have been promoted by stresses associated with forming Tropical Cyclone to the south as noted in the previous issue of this summary:

 

"A tropical cyclone (Gaja) may be forming in the east of India. This system is currently located at 12N 92E with winds up to 30 kts. It is moving WNW and may make landfall in Peninsular India next week. A seismic watch may be called at that time." (November 9, 2018)

 

The last earthquake within about 200 km of the India quake of M 5.2 with greater or equal magnitude occurred on April 24, 2018 with M 5.2. The last of larger magnitude were events of M 5.5 on January 7, 2018 and of M 5.7 on January 3, 2017.  Forecast 120996 had expected this epicenter would be active in this region in early November.

 

O: 10NOV2018 17:15:44  24.0N   93.6E Mw=5.2  EMSC   MYANMAR-INDIA BORDER REGION  

P:  5NOV2018 120996    23.0N   94.0E 4.0-5.5 BAAAA  Myanmar                    

 

NEIC reported the earthquake of M 4.5 in Northern India was felt with intensity II-III in the area(s) of Uttaranchal, India.

 

O: 11NOV2018 07:07:31  29.9N   80.6E mb=4.5  EMSC   NEPAL-INDIA BORDER REGION     

P:  8NOV2018 121064    30.0N   82.0E 3.8-5.4 BABAA  Xizang                     

 

O: 11NOV2018 01:35:48  32.3N   69.7E mb=4.0  EMSC   PAKISTAN                     

P: 10NOV2018 121038    34.0N   70.0E 3.8-5.2 ABAAA  Pakistan                   

 

A moderate earthquake of M 4.7 and a aftershock of M 4.3 hit the region of Antigua and Barbuda today. NEIC reported this earthquake of M 4.5 in Antigua and Barbuda was felt with intensity II-III in the area(s) of Antigua and Barbuda at Potters Village and Saint John's and in Guadeloupe at Petit-Bourg. This event occurred within minutes of local solar noon and was probably promoted by tidal stresses associated with the new moon as previously noted in this summary:

 

 

"The new moon arrived on November 7, 2018 at 16:02 UT. Longitudes which were sub-solar at this time are near 60W with those anti-solar at 120E. This includes much of the Caribbean and the western Pacific Rim from Indonesia (Sulawesi) north to Japan. These regions (among others) are likely to see increased tidal promotion during the coming week." (November 5-9, 2018)

 

The last earthquake of M>=4.7 within about 200 km of this epicenter in Antigua and Barbuda was an M 4.7 on April 17, 2108, an aftershock of an M 5.0 of April 5, 2018.  Forecast 120970 had expected activity in this area was likely around November 7.

 

O: 10NOV2018 16:25:44  17.6N   61.1W mb=4.7  EMSC   ANTIGUA AND BARBUDA REGION   

O: 10NOV2018 18:10:38  17.6N   61.2W Mw=4.3  EMSC   ANTIGUA AND BARBUDA REGION   

P:  7NOV2018 120970    16.0N   61.0W 3.0-5.3 BBAAA  Leeward Islands            

 

 

MODERATE TO STRONG QUAKES HIT ALONG GEOMAGNETIC EQUATOR

 

EARTHQUAKE SUMMARY FOR NOVEMBER 9, 2018

 

A series of moderate to strong earthquake hit along the geomagnetic equator today. These began with an M 5.2 in the Central Mid-Atlantic. This was followed by an antipodal earthquake in New Britain of M 5.6 and an M 6.1 quake in Tonga, both near the geomagnetic equator. This accompanied northern lights associated with arrival of charged particles from the sun and the current geomagnetic storm as noted in previous issues of this summary:

 

 

"The geomagnetic field saw disturbed conditions today. The AP level was 10. High latitude geomagnetic field also saw disturbed conditions  with AP at 15. This continues the strongest geomagnetic storm since October 8 when high latitude AP reached 53. KP of 6 was seen in early November 5. Seismicity near the geomagnetic equator and at high latitudes is expected to to be enhanced during the period November 8-13." (November 6-7, 2018)

 

The earthquake in the Central Mid-Atlantic of M 5.2 today was the strongest within about 200 km of that epicenter since an M 5.2 on October 15, 2018. The last of significantly larger magnitude in the area was an M 5.5 on May 24, 2018 and prior to that an M 5.7 on January 27, 2016.  Forecasts 120939 and 120925 had expected this activity was likely in early November. This event is located at the fifth node (72 degrees) from the M 6.8 in Jan Mayen yesterday and may have been enhanced by energy from that event.

 

O: 10NOV2018 07:17:52   0.8N   29.8W mb=5.2  ANSS   Central Mid-Atlantic Ridge"  

O: 10NOV2018 07:17:51   0.8N   29.7W mb=5.2  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P:  7NOV2018 120925     4.0S   32.0W 4.0-5.5 BCBAA  Central Mid-Atlantic Ridge 

P:  5NOV2018 120939     1.0S   24.0W 4.0-5.5 BBCAA  Central Mid-Atlantic       

 

A moderately large earthquake of M 5.6 in New Britain occurred about 45 minutes after the Central Mid-Atlantic event. It was not reported felt but is in the antipodal zone from the Mid-Atlantic epicenter and may have been promoted by similar global stresses. The epicenter is also near the geomagnetic equator and was probably enhanced by stresses associated with the end of the geomagnetic storm today. The last earthquake within about 200 km of this epicenter in New Britain with M>=5.6 was an M 7.0 on October 10, 2018 and an aftershock of M 5.6 on October 12. Today's event is probably an aftershock of those October mainshocks. Forecast 120945 had expected this activity was likely around November 7.

 

O: 10NOV2018 08:02:16   5.8S  151.7E Mw=5.6  EMSC   NEW BRITAIN REGION, P.N.G.   

P:  7NOV2018 120945     4.0S  152.0E 4.0-5.4 BBAAA  New Britain                

 

The largest earthquake of the day was an M 6.2 in eastern Tonga. This event was not reported felt in this epicentral area. This is the strongest earthquake in Eastern Tonga since an M 5.2 on July 6, 2015 about 30 km north of today's epicenter.  Tonga is about 10 degrees south of the geomagnetic equator and the current geomagnetic storm probably enhanced today's event. An M 5.6 foreshock occurred in the region three days ago and was noted as such in  this summary at the time:

 

"The strongest earthquake in the world today was an M 5.6 in the Tonga region. It was not reported felt in this area. It has been more than a year since a larger earthquake occurred within about 200 km of this epicenter in eastern Tonga. An M 6.0 on October 18, 2017 was the last although two of M 5.5-5.6 occurred more recently on December 11, 2017 and May 13, 2018. Forecast 121163 had expected today's activity was likely around November 9." (November 6-7, 2018)

 

Forecast 121163 had expected this activity within 50-100 km of this epicenter was most likely around November 7.

 

O: 10NOV2018 08:33:23  20.5S  174.3W Mw=6.2  EMSC   TONGA                        

P:  7NOV2018 121163    20.0S  174.0W 4.0-5.4 BAAAA  Tonga Islands              

 

The strongest earthquakes in the U.S. or Canada today was an M 3.8 in northern

California near Willits. NEIC reported intensity IV in Willits and II-III in Redland, Potter Valley, Ukiah, Fort Bragg, Mendocino and Upper Lake, California. A major fire broke out in this area as well today. It was reported to have killed at least 9 in a town in the area. The last earthquake of M>=3.8 within  about 50 km of this epicenter was an M 4.3 nearly a year ago on December 14, 2017.  forecast 121017 had expected this event within about 50 was most likely around November 9.

 

O:  9NOV2018 20:31:48  39.4N  123.3W Mw=3.8  EMSC   NORTHERN CALIFORNIA          

P:  9NOV2018 121017    39.7N  123.7W 2.5-4.4 AAAAA  Central California         

 

A series of light earthquake up to M 3.8 also hit southeast of Los Angeles in the Aguanga region. These were felt in Aguanga, Anza, Hemet, Temecula, Warner Springs, Winchester, Valley Center, Murrieta among others.

Earthquakes of M 3.8, 3.0, 3.7, 2.9 occurred in this swarm. Fires also lit

portions of Southern California today.  The last earthquake in the Aguanga region - an active seismic zone - of M>=3.8 occurred August 15, 2018 with M 4.4 and prior to that as an M 4.5 on May 8, 2018. Forecast 121044 had expected today's activity within about 15 km was likely around November 7.

 

O: 09NOV2018 14:48:53  33.5N  116.8W ML=2.4  EMSC   SOUTHERN CALIFORNIA

O: 09NOV2018 14:52:27  33.5N  116.8W ML=2.4  EMSC   SOUTHERN CALIFORNIA

O: 09NOV2018 23:49:14  33.5N  116.8W ML=2.5  EMSC   SOUTHERN CALIFORNIA

O: 09NOV2018 14:45:28  33.5N  116.8W ML=2.9  EMSC   SOUTHERN CALIFORNIA

O: 09NOV2018 14:58:09  33.5N  116.8W Mw=3.8  EMSC   SOUTHERN CALIFORNIA

O:  9NOV2018 15:35:37  33.5N  116.8W ML=2.0  EMSC   SOUTHERN CALIFORNIA          

P:  7NOV2018 121044    33.4N  116.7W 2.5-4.5 AAAAA  So. California             

 

The largest earthquake in the California region today however, was an M 4.9 in the Gulf of California. It was accompanied by a smaller foreshock. NEIC reported this earthquake of M 4.9 in the Gulf of California was felt with intensity II-III in the area(s) of Loreto, Baja California. This epicenter is at 102 degrees from the earthquakes in the Ionian Sea and was probably promoted by concentrated energy from those events. Other  areas near 103 degrees from the Ionian Sea which saw moderate earthquakes today included Molucca, Talaud, northern Chile and Argentina, Michoacan, Mexico. Forecast 120991 had expected this activity in the Gulf of California was likely around November 11. The last quake in the area with M>=4.9 occurred January 19, 2018 with M 6.3.

 

O:  9NOV2018 14:03:31  25.6N  109.9W ML=3.6  EMSC   GULF OF CALIFORNIA           

O:  9NOV2018 14:33:51  26.0N  110.4W mb=4.9  EMSC   GULF OF CALIFORNIA           

P: 11NOV2018 120991    25.0N  113.0W 3.5-4.9 AACAA  Gulf of California         

 

STRONG JAN MAYEN EARTHQUAKE PROMOTED BY GEOMAGNETIC STORM AND TIDAL STRESSES

 

EARTHQUAKE SUMMARY FOR NOVEMBER 8, 2018

 

A strong earthquake of M 6.8 hit the Jan Mayen region north of Norway today. It  as followed by moderately large earthquakes in the South Atlantic including an M 5.8 in the region of Tristan da Cunha. The Jan Mayen quake may have been felt lightly in Tromso, Norway. With effects from the strongest geomagnetic storm in a month and high astronomical tides, high latitudes had been expected to be active at this time as noted in previous summaries:

 

 

"The geomagnetic field saw disturbed conditions today. The AP level was 10. High latitude geomagnetic field also saw disturbed conditions  with AP at 15.  This continues the strongest geomagnetic storm since October 8 when high latitude AP reached 53. KP of 6 was seen in early November 5. Seismicity near the geomagnetic equator and at high latitudes is expected to to be enhanced during the period November 8-13." (November 6-7, 2018)

 

and with tidal stresses as:

 

"The new moon arrived on November 7, 2018 at 16:02 UT. Longitudes which were sub-solar at this time are near 60W with those anti-solar at 120E. This includes much of the Caribbean and the western Pacific Rim from Indonesia (Sulawesi) north to Japan. These regions (among others) are likely to see increased tidal promotion during the coming week." (November 6-8, 2018)

 

Today's event occurred within less than an hour of local solar midnight suggesting tidal promotion which is high at this hour of day.

 

The last earthquake, and only such event in the past 30 years, in the Jan Mayen Island area, of M>=6.8  within about 300 km of this epicenter occurred August 30, 2012 also with M 6.8. It is interesting to note what this summary said at the time about this event's promotion. These notes could apply to today's event:

 

"Many area(s) at high latitudes saw significant earthquakes today. The strongest of these was an M 6.8 in the Jan Mayen area of the Arctic Ocean ...  This may be a response to geomagnetic storms at high latitudes which occurred 4-5 days ago. There is often a 4-5 day lag between strong geomagnetic storms and subsequent seismicity at high latitudes. It is thought that the solar wind disrupts the auroral ionospheric ring currents during the storm and that these regenerate over the next four days to their strongest levels. The currents in the ionosphere then induce electric currents in the earth beneath at high latitude and these in turn can help promote strong seismicity such as was witnessed today. Some of today's activity was also probably promoted by the full moon today. For example, the M 6.6 in the Jan Mayen area occurred within about an hour of local noon, the maximum time for tidal effects in the area.

 

The full moon alignment is complete at 13:58 UT today (August 31). In the past four lunar months strong earthquakes have been uncommon at the time of the full moon and the M 6.6 in Norway today is the largest within a day of the full moon in the past four cycles." (August 30-31, 2012)

 

Today's epicenter in the Jan Mayen area is at 103 degrees from the last major earthquake in the world - the M 7.5 in Sulawesi, Minahasa, Indonesia of September 28, 2018. Strong triggering at this distance from major earthquakes is not unexpected as energy from strong quakes is redirected to this distance on the surface and is often followed by strong regional activation at this distance. Three earthquakes of M>=6.8, including today's, have occurred since Minahasa. The other two were in the Vancouver Island, B.C. Canada and the Ionian Sea areas, both of which areas are near 103 degrees from Minahasa, Indonesia.

 

The mainshock of M 6.8 was preceded by an M 3.4 foreshock about 100 km to the southeast. Forecast 121137 had expected today's activity was likely within about 50 km of these epicenter around November 6-7.

 

O:  8NOV2018 13:47:34  70.8N    7.6W ML=3.4  EMSC   JAN MAYEN ISLAND REGION      

P:  7NOV2018 121137    71.0N    8.0W 3.5-5.0 AAAAA  Jan Mayen Isl. area        

 

O:  9NOV2018 01:49:39  71.6N   11.3W Mw=6.8  EMSC   JAN MAYEN ISLAND REGION      

P:  6NOV2018 121137    71.0N   13.0W 3.5-5.0 BAAAA  Jan Mayen Isl. area        

 

A series of earthquakes in the Southern Mid-Atlantic Ridge near Tristan Da Cunha was not reported felt in that area today. These included quakes of M 5.8, 5.5  and 4.7. The last earthquake of M>=5.8 in the Tristan da Cunha area within  about 250 km of this epicenter was an M 6.0 on September 29, 1993. The only  other event of M>=5.8 in the area in the past 30 years was a similar M 5.8 on March 22, 1992.  Forecast 120918 had expected this activity was likely at the end of October or in early November within about 150 km of today's epicenters.

 

O:  9NOV2018 07:39:16  42.6S   16.1W mb=5.5  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

O:  9NOV2018 07:54:56  42.7S   16.0W Mw=5.8  EMSC   TRISTAN DA CUNHA REGION      

O:  9NOV2018 06:17:24  42.7S   16.0W mb=4.7  EMSC   TRISTAN DA CUNHA REGION      

P: 31OCT2018 120918    44.0S   16.0W 4.0-5.7 CBAAA  So. Mid-Atlantic Ridge     

 

A moderate earthquake of M 5.2 was widely felt in Western Australia today. NEIC reported intensity IV in Western Australia at Albany, Collie, Australind, and II-III in Bunbury, Busselton, Mandurah, Kwinana, Perth and Northam, Australia. The mainshock followed a series of light earthquakes in the area beginning with an M 3.8 half a day earlier. The only earthquake within about 250 km of this epicenter in the past 30 years was an M 5.2-5.3 on September 16, 2018. Today's event appears to be the strongest aftershock of that to date. Forecast 121165  had expected this event to the south was likely around November 11.

 

O: 08NOV2018 15:07:58  34.4S  116.8E ML=3.3  EMSC   WESTERN AUSTRALIA

O: 08NOV2018 15:09:34  34.4S  116.8E ML=3.6  EMSC   WESTERN AUSTRALIA

O: 08NOV2018 10:59:08  34.4S  116.8E ML=3.8  EMSC   WESTERN AUSTRALIA

O: 08NOV2018 16:51:57  34.5S  116.8E ML=2.6  EMSC   WESTERN AUSTRALIA

O:  8NOV2018 21:07:00  34.3S  117.0E Mw=5.2  EMSC   WESTERN AUSTRALIA            

P: 11NOV2018 121165    30.0S  117.0E 2.0-3.4 BCAAA  Central Australia          

 

 

ODERATE AFTERSHOCKS CONTINUE IN SUMBAWA, INDONESIA

 

EARTHQUAKE SUMMARY FOR NOVEMBER 7, 2018

 

The strongest earthquake in the world today was an M 5.3 aftershock in the Sulawesi area of Indonesia.  BMG reported the mainshock of  M 5.2 was felt with intensity III-IV Mamasa, III in Polewali Mandar, Mamuju, Majene, Rinrang, Enrekang and Rantepao; and II in Rantepao, Luwuk and Palopo, Sulawesi, Indonesia. BMG reported an M 4.2 aftershock was felt with intensity III in Mamasa, Sulawesi, Indonesia. BMG reported an M 4.1 aftershock was felt with intensity II-III in Mamasa, Sulawesi, Indonesia. BMG reported an M 4.0 aftershock was felt with intensity II-III in Mamasa, Sulawesi, Indonesia. Forecasts 120954 and 120924 had expected moderate aftershocks in Sulawesi were like around November 8-9. It is likely that this enhanced seismicity in the Sulawesi area was promoted by the current geomagnetic storm, the strongest in a month as Sulawesi is within about 10 degrees of the geomagnetic equator. This summary had noted this possibility in previous issues as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 10. High latitude geomagnetic field also saw disturbed conditions  with AP at 15. This continues the strongest geomagnetic storm since October 8 when high latitude AP reached 53. KP of 6 was seen in early November 5. Seismicity near the geomagnetic equator and at high latitudes is expected to to be enhanced during the period November 8-13." (November 6-7, 2018)

 

 

O:  7NOV2018 09:42:26   2.9S  119.4E Mw=5.3  EMSC   SULAWESI, INDONESIA          

O: 07NOV2018 09:42:26  02.9S  119.4E MS=5.2  BMG  Felt with intensity III-IV

O: 07NOV2018 19:04:57  02.9S  119.3E MS=4.2  BMG  Felt with intensity III

O: 07NOV2018 12:40:43  02.9S  119.3E MS=4.1  BMG  Felt with intensity II-III

O: 07NOV2018 12:37:37  02.9S  119.3E MS=4.0  BMG  Felt with intensity II-III

P:  8NOV2018 120954     1.0S  122.0E 4.0-5.5 ABBAA  Sulawesi area              

P:  9NOV2018 120924     0.0N  120.0E 4.0-5.4 ACAAA  Celebes Sea                 

 

An earthquake of M 5.0 was widely felt in Taiwan today.  CWB reported this earthquake was felt with intensity II in Taitung and Changhua and I in Hualien, Yilan, Nantou, Taichung, Yunlin and Taipei Counties, Taiwan. The last event in Taiwan within about 150 km of this epicenter with M>=5 occurred as an M 5.7 on October 23 about 100 km north of today's epicenter.  The last within abou 100 km of today's epicenter was an M 5.0 on February 21, 2018. Forecast 121002 had expected this event in this area was likely around November 6.

 

O:  7NOV2018 21:05:11  22.9N  122.6E mb=5.0  EMSC   TAIWAN REGION                

O:  7NOV2018 21:05:11  22.8N  122.6E ML=5.1  TAI    Hualien, Taiwan              

P:  6NOV2018 121002    23.0N  121.0E 4.0-5.5 AAAAA  Taiwan                      

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in Central Alaska. NEIC reported this earthquake of M 3.9 in Southern Alaska was felt with intensity II-III in the area(s) of Talkeetna, Wasilla, Chugiat, Fairbanks and Homer, Alaska. The last earthquake of M>=3.9 within about 100 km of this epicenter in Central Alaska was an M 3.9 on October 19, 2018 but the last of larger magnitude in this area was an M 4.3 on August 15, 2018.  Forecast 121128 had expected today's event within about 25 km of today's epicenter was likely around November 9.

 

O:  8NOV2018 04:49:00  63.1N  150.9W mb=3.9  EMSC   CENTRAL ALASKA               

P:  9NOV2018 121128    63.3N  151.0W 3.2-5.1 AAAAA  Central Alaska             

 

MODERATELY STRONG QUAKE IN EASTERN TONGA

 

EARTHQUAKE SUMMARY FOR NOVEMBER 6, 2018

 

The strongest earthquake in the world today was an M 5.6 in the Tonga region. It was not reported felt in this area. It has been more than a year since a larger earthquake occurred within about 200 km of this epicenter in eastern Tonga. An M 6.0 on October 18, 2017 was the last although two of M 5.5-5.6 occurred more recently on December 11, 2017 and May 13, 2018. Forecast 121163 had expected today's activity was likely around November 9.

 

O:  6NOV2018 16:11:39  22.2S  174.5W Mw=5.6  EMSC   TONGA REGION                 

P:  9NOV2018 121163    24.0S  176.0W 4.0-5.6 BBBAA  Tonga Islands              

 

A series of light earthquakes occurred south of and in the San Francisco Bay area of California today. This continues an active period which began with an M 4.1 three days ago. Today's activity may be related to the current geomagnetic storm or to the new moon which arrived today. The largest of these, an M 2.5 in the San Francisco Bay area, occurred within about half an hour of local solar noon, a prime time for tidal stresses. Forecasts 121013 and 121014 had expected each of these epicenter would be active around November 6-7 within about 10-20 km of these epicenters.

 

O:  7NOV2018 06:36:08  37.1N  122.3W MD=2.3  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  6NOV2018 121013    37.2N  122.1W 2.5-4.4 AAAAA  Central California         

 

O:  6NOV2018 12:50:54  37.3N  121.7W MD=2.0  EMSC   NORTHERN CALIFORNIA          

P:  7NOV2018 121013    37.3N  121.6W 2.5-4.4 AAAAA  Central California         

 

NEIC reported the earthquake of M 2.5 in Central California was felt with intensity II-III in the area(s) of San Leandro, Hayward, Castro Valley, Oakland, Emeryville, Pleasanton and Milpitas, California.

 

O:  6NOV2018 19:28:11  37.7N  122.1W MD=2.5  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P:  7NOV2018 121014    37.7N  121.9W 2.5-4.4 AAAAA  Central California         

 

An earthquake of M 4.9 hit the region north of Madagascar in the Mayotte area today. NEIC reported this earthquake of M 4.9 in Mayotte was felt with intensity IV in the area(s) of Pamanzi, Mayotte. The area saw a series of moderate quakes in May and June, 2018, perhaps related to the nearly antipodal eruption of Kilauea in Hawaii. The last earthquake in the region with M>4.9 was an M 5.2 on June 27 at the end of the Kilauea eruption. Earthquakes of M 4.8-4.9 have since occurred on August 21 and again on October 16, 2018. Today's earthquake may have been promoted by stresses related to Tropical Cyclone Alcide which formed yesterday to the northeast of this epicenter as noted in previous issues of this summary:

 

"TC Alcide (03E) continued North of Madagascar today with winds up to 80 kts.

Seismicity in the region is not expected to be enhanced with this storm. This storm is expected to track to the west turning south around November 8." (November 7, 2018)

 

Forecast 120881 had expected this area would be active in late October or early November.

 

O:  7NOV2018 06:04:23  12.8S   45.4E mb=4.9  EMSC   MAYOTTE REGION               

P: 31OCT2018 120881    13.0S   42.0E 3.0-4.8 CACAA  Madagascar area            

 

STRONG GEOMAGNETIC STORM MAY BRING STRONGER SEISMICITY

 

EARTHQUAKE SUMMARY FOR NOVEMBER 5, 2018

 

A strong geomagnetic storm today may enhance seismicity along the geomagnetic equator in coming days and probably promoted the strongest quakes of the day - an M 5.5 in the Talaud Islands and an M 5.3 in Sulawesi. The geomagnetic storm was noted in this summary as:

 

"The geomagnetic field saw minor storm conditions today. The AP level was 35. High latitude geomagnetic field also saw minor storm conditions  with AP at 44.  This is the strongest geomagnetic storm since October 8 when high latitude KP reached 53. KP of 6 was seen in early November 5. Seismicity near the geomagnetic equator and at high latitudes is expected to to be enhanced during the period November 8-13." (November 6, 2018)

 

BMG reported the earthquake of M 4.6 was felt with intensity III-IV in Sangihe and II-III in Talaud, Sulawesi, Indonesia. NEIC reported this earthquake of M 5.2 in Sulawesi, Indonesia was felt with intensity IV in Polewali, Sulawesi and II-III in the area(s) of Majene, Sulawesi. BMG reported the earthquake of M 5.2 in Sulawesi was felt with intensity IV in Mamasa; III-IV in Mamuju, Toraja, Polewali and Majene and III in Palopo, Sulawesi, Indonesia. Forecast 120954 expected moderate regional activity in early November.

 

O:  5NOV2018 18:35:53   2.9S  119.5E Mw=5.2  EMSC   SULAWESI, INDONESIA          

O: 06NOV2018 03:18:40  02.9S  119.4E MS=4.6  BMG  Felt with intensity II-III

P:  8NOV2018 120954     1.0S  122.0E 4.0-5.5 BBBAA  Sulawesi area              

 

BMG reported the M 5.5 was felt with intensity IV in Mamasa; III-IV in Mamuju, Toraja, Polewali and Majene and III in Palopo, Sulawesi, Indonesia.

BMG reported the M 4.6 was felt with intensity V in Lombok; IV in Mataram Indonesia. Forecast 120924  expected this activity in early November.

 

O:  6NOV2018 03:18:42   2.9S  119.5E mb=4.4  EMSC   SULAWESI, INDONESIA          

O: 05NOV2018 18:35:53  02.9S  119.4E MS=5.5  BMG  Felt with intensity IV

O: 06NOV2018 01:00:14  08.5S  116.6E MS=4.6  BMG  Felt with intensity V

P:  9NOV2018 120924     0.0N  120.0E 4.0-5.4 BCAAA  Celebes Sea                

 

BMG reported an earthquake of M 5.3 in Talaud, Indonesia was felt with intensity III-IV in Sangihe and II-III in Talaud, Sulawesi, Indonesia. Forecast 120932 had expected this evetn was likely around November 5.

 

O:  6NOV2018 02:09:48   3.6N  125.5E mb=5.3  EMSC   KEPULAUAN SANGIHE, INDONESIA 

O: 06NOV2018 02:09:51  03.5N  125.4E MS=5.3  BMG  Felt with intensity III-IV

P:  5NOV2018 120932     5.0N  125.0E 4.0-5.6 ABAAA  Mindanao, Philippines      

 

 

A moderate earthquake of M 4.5 occurred in the Auckland Islands of Southern New Zealand. This appears to be part of the current activation of the area which began with the M 6.1-6.5 quake under North Island, New Zealand last week. Today's event occurred in a remote area and was not reported felt. The last earthquake of M>=4.5 in the Auckland Islands within about 200 km of this epicenter was an M 4.5 on August 12, 2018. These are probably aftershocks of the M 6.6 within about 50 km of today's epicenter of July 11, 2017. Forecast 120917 had expected activity in this area at the end of October or in early November.

 

O:  5NOV2018 19:54:26  49.6S  163.8E mb=4.5  EMSC   AUCKLAND ISLANDS, N.Z. REGION

P: 31OCT2018 120917    45.0S  167.0E 3.0-4.9 BCCAA  So. Island, N.Z.           

 

A moderate earthquake of M 4.2-4.3 in the Vancouver Island area of Canada today

was the strongest event in the U.S. or Canada of the day. NEIC reported this earthquake of M 4.3 in Vancouver was felt with intensity II-III in the area(s) of Port Hardy, Courtenay and Sooke, British Columbia and in Washington at Friday Harbor and Anacortes. This is part of the aftershock sequence of the strong quakes of October 22. This earthquake occurred within minutes of local solar noon and was probably promoted by strong tidal stresses associated with the new moon which maximize at this hour. Forecast 121095 expected this activity around November 6.

 

O:  5NOV2018 20:25:35  49.3N  129.4W mb=4.3  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 05NOV2018 20:25:31  49.0N  129.8W ML=4.2  NRCA  259 km SW  of Pt. Hardy

O: 04NOV2018 17:16:56  49.4N  129.5W ML=3.2  NRCA  209 km WSW of Pt. Hardy

P:  6NOV2018 121095    48.7N  129.0W 2.8-5.2 AAAAA  Vancouver Island area      

 

An earthquake of M 4.4 in the area east of Martinique, Windward Islands occurred today. It was not reported felt in this area. The last earthquake within about  100 km of this epicenter with M>=4.4 occurred on September 28, 2018 with M 5.4 and may be an aftershock of that earthquake. Forecast 120970 had expected this event in this area was likely around November 3. It occurred at the longitude of maximum tidal stresses and was probably promoted by this. The tidal forecast had noted this as:

 

"The new moon will arrive on November 7, 2018 at 16:02 UT. Longitudes which are sub-solar at this time are near 60W with those anti-solar at 120E. This includes much of the Caribbean and the western Pacific Rim from Indonesia (Sulawesi) north to Japan. These regions (among others) are likely to see increased tidal promotion during the coming week." (November 6, 2018)

 

O:  5NOV2018 12:45:29  15.0N   59.7W mb=4.4  EMSC   EAST OF MARTINIQUE, WINDWARD I

P:  3NOV2018 120970    15.0N   61.0W 3.0-5.2 AAAAA  Leeward Islands            

TRONG QUAKES DEEP BENEATH MINDANAO; HOKKAIDO

 

EARTHQUAKE SUMMARY FOR NOVEMBER 4, 2018

 

The strongest earthquake today was an M 6.0 at a hypocenter deep under northern Mindanao, Philippines. A series of moderately large earthquakes hit east of this earlier in the week and this may be caused by stress migration down the subducting slab following that activity. One felt report from NEIC was associated with this event - an intensity II in Bacolod, Western Visayas, Philippines, but this may refer to a moderate event in that region later in the day. This is the first earthquake with M>=6.0 in the Western Visayas, Philippines within about 200 km of this epicenter since an M 6.0 on May 20, 2017 and prior to that an M 6.6 on December 2, 2014.  Forecast 120674 had expected this event at the end of October within about 100 km of the epicenter.

 

O:  4NOV2018 07:55:29   7.8N  123.9E Mw=6.0  EMSC   MINDANAO, PHILIPPINES        

P: 28OCT2018 120674     8.0N  125.0E 4.0-5.4 CAAAA  Central Philippines        

 

The second strongest earthquake of the day was an M 5.9 in Hokkaido, Japan. NEIC reported this event was felt with intensity III in Nakashibetsu, Hokkaido, Japan. The last earthquake within about 200 km of this epicenter with M>=5.9 was an M 5.9 on November 28, 2015 and prior to that an M 6.1 on September 21, 2005. An M 6.3 about 250 km southeast of today's epicenter occurred on July 7, 2015. Forecast 121092 had expected this event within about 50 km of the epicenter  around November 4.

 

O:  4NOV2018 19:26:03  44.6N  145.6E Mw=5.9  EMSC   HOKKAIDO, JAPAN REGION       

P:  4NOV2018 121092    45.0N  146.0E 3.5-5.5 AAAAA  So. Kurils                 

 

The largest earthquake in the U.S. or Canada today was an M 4.4 in the Gulf of Alaska aftershock zone. It was not reported felt in this epicentral area. The last such earthquake in the Gulf of Alaska was an M 4.9 on October 27 and prior to that an M 4.5 on September 16, 2018 Forecast 121101 had expected today's activity was likely around November 7.

 

O:  4NOV2018 18:48:23  55.9N  150.0W mb=4.4  EMSC   GULF OF ALASKA               

P:  7NOV2018 121101    55.0N  149.0W 2.0-4.2 AAAAA  Gulf of Alaska             

 

Moderate sized earthquakes also continued in New Zealand today following last week's M 6.1-6.5. GEONET reported an earthquake of M 4.7-4.8 was felt with moderate intensity northeast of Okahune and in southwestern North Island and northern South Island. Light to moderate intensity was reported throughout much of southern and western North Island and northern South Island. More than 1940 people reported feeling this earthquake with 915 reports of weak intensity; 919 of light intensity; 98 with moderate intensity; 6 with strong intensity; and 1 of severe intensity and 1 of extreme shaking. A second moderate earthquake was felt in South Island.  GEONET reported this earthquake of M 4.0 was felt with light intensity in northern South Island. 42 people reported feeling this event; 28 with weak intensity; 12 with light shaking; 2 moderate; 0 strong and none with extreme shaking. The M 4.7-4.8 was the largest off the east coast of North Island since an M 4.8 on October 17, 2018. The last of significantly larger magnitude in the area was an M 5.1 on April 9, 2018. Forecast 121178 had expected this event was likely in early November. The epicenter is 103 degrees from the series in Vancouver of October 22 and was probably promoted by energy from that swarm.

 

O:  4NOV2018 09:32:37  40.0S  177.0E mb=4.7  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 04NOV2018 09:32:40  39.9S  176.8E ML=4.8  GEONET Felt with moderate intensity

P:  9NOV2018 121178    41.0S  176.0E 3.0-5.0 BAAAA  So. Island, N.Z.           

 

The event of M 4.2 in South Island had been expected around November 5 within about 100 km of this epicenter in forecast 121178.

 

O:  4NOV2018 23:08:59  42.6S  173.2E ML=4.2  GEONET Felt with light intensity in n

P:  5NOV2018 121178    42.0S  174.0E 3.0-5.2 AAAAA  So. Island, N.Z.           

 

 

QUIET DAY DURING SEISMIC LULL

 

EARTHQUAKE SUMMARY FOR NOVEMBER 3, 2018

 

It was a quiet day on the global seismicity stage today. No moderately large or large earthquakes were recorded. This follows a relatively quiet October, 2018. The main seismic promoters during October were swarms in Vancouver, Canada and in the Ionian Sea, both of which included events of M 6.8, but no major earthquakes were recorded during the month. The last major global earthquakes was the Minahasa, Sulawesi quake of M 7.5 of September 28, 2018 which, along with a tsunami killed thousands in that area of Indonesia. This and the  swarms in Vancouver and Greece along with great quakes in Fiji have been promoters of lesser seismicity in other areas in recent weeks.

 

 

The strongest earthquake in the world today was an M 5.3 in Southern Xinjiang, China. It was not immediately reported felt but was probably felt lightly in the epicenter zone. It was preceded by an M 4.4 and followed by an aftershock of M 4.1. The last earthquake within about 200 km of this epicenter in China was recorded on January 20, 2017 (M 5.3) and prior to that on May 4, 2014 (M 5.4). The last strong earthquake in the area was an M 6.0 on February 14, 2005.  Forecast 121034 had expected this activity in this area was likely in early November.

 

O:  3NOV2018 21:36:20  40.1N   77.6E mb=5.3  EMSC   SOUTHERN XINJIANG, CHINA     

O:  3NOV2018 17:20:54  40.2N   77.8E mb=4.4  EMSC   SOUTHERN XINJIANG, CHINA     

O:  4NOV2018 02:29:09  40.4N   77.5E mb=4.1  EMSC   SOUTHERN XINJIANG, CHINA     

P: 11NOV2018 121034    39.0N   78.0E 3.8-5.2 CBAAA  Northern India             

 

EMSC reported an M 5.0 east of North Island, New Zealand today. It was not reported by GeoNet as felt. This is an unusual epicenter any may be related to stress transfer from the M 6.1-M 6.5 under North Island a week ago. The last earthquake of M>=5 in this region west of North Island within about 150 km of this epicenter was an M 5.0 on February 9, 2010. The only other such events in this region in the past 30 years occurred with M 5.2-5.3 on July 14, 2006 and February 9, 1995. Forecast 121170 had expected activity in this region around November 3.

 

O:  3NOV2018 20:03:35  39.6S  178.7W mb=5.0  EMSC   EAST OF NORTH ISLAND, N.Z.   

P:  3NOV2018 121170    38.0S  179.0W 3.5-5.3 ABAAA  E. of North Islands N.Z.   

 

UNUSUAL SWARM FOLLOWS M 4.1 IN CENTRAL CALIFORNIA

 

EARTHQUAKE SUMMARY FOR NOVEMBER 2, 2018

 

A series of light to moderate earthquakes occurred in Central California today.

The larger of these of M 3.0-4.0 were reported by NEIC to have been felt with

intensity II-III in California at Gonzales, San Juan Bautista, Soledad, Gilroy, Aromas,  Hollister, Salinas, Castroville, Carmel Valley, Monterey and other areas within about 50 km of the epicenters. The mainshock was M 4.1. An earthquake of M 3.5 south of San Francisco also occurred in this series as well as four light earthquakes in the Kettleman City area of Central California. Central California has been relative quiet during the current activation of many areas following the strong quakes in Vancouver of October 22. Today's activity was the anomaly in this pattern. Today's activity may be related to a series of storms moving up the east coast of the U.S. as noted in earlier issues of this summary:

 

"A strong nor'easter storm is developing in the southern U.S. It is expected to track up the eastern coast of the U.S. reaching the northeast U.S. on Saturday, October 27, 2018. Past occurrences of such storms have often been accompanied by significant increases in seismicity along the western North American Plate rim. A seismic watch, including for enhanced aftershocks in en Vancouver, is being called for this region for the period October 26-November 1." (October 25, 2018)

 

Activity off the coast of San Francisco over the past several days may have precursory to today's activity. This had been noted in the past several issues of this report as, for example:

 

"NEIC reported this earthquake of M 2.7 South of San Francisco, California  was felt with intensity IV in San Jose and II-III in the area(s) of Santa Clara and Fremont, California.  This continues unusual offshore activity near San Francisco and may indicate a stronger upcoming event." (November 1, 2018)

 

O: 02NOV2018 18:57:16  36.0N  120.1W MD=2.1  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 18:41:15  36.0N  120.1W MD=2.3  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 18:31:03  36.0N  120.6W MD=2.0  EMSC   CENTRAL CALIFORNIA

O:  2NOV2018 18:48:06  36.0N  120.1W MD=2.1  EMSC   CENTRAL CALIFORNIA           

P: 31OCT2018 120754    36.1N  120.1W 2.5-4.4 AAAAA  Central California         

 

The last earthquake of M>=4.1 within about 50 km of that event in Central California today was an M 4.6 a year ago on November 13, 2017 and prior to that as an M 4.1 on July 19, 2016.  Swarms of this type are rare in central California. Forecast 120755 had expcted today's activity was likely at the end of October.

 

O: 02NOV2018 13:33:39  36.7N  121.3W MD=2.0  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 16:21:42  36.7N  121.3W MD=2.0  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 17:09:54  36.7N  121.3W MD=2.1  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 15:55:10  36.7N  121.3W MD=2.6  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 19:18:52  36.7N  121.3W MD=2.6  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 16:54:05  36.7N  121.3W MD=2.8  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 13:10:56  36.7N  121.3W MD=2.9  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 17:02:54  36.7N  121.3W MD=2.9  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 15:52:11  36.7N  121.3W MD=3.0  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 13:01:14  36.7N  121.3W ML=3.1  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 15:15:48  36.7N  121.3W ML=3.1  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 16:19:30  36.7N  121.3W ML=3.3  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 15:27:03  36.7N  121.3W Mw=3.5  EMSC   CENTRAL CALIFORNIA

O: 02NOV2018 13:22:43  36.7N  121.3W Mw=3.6  EMSC   CENTRAL CALIFORNIA

O:  2NOV2018 12:58:54  36.7N  121.3W Mw=4.1  EMSC   CENTRAL CALIFORNIA           

P: 28OCT2018 120755    37.1N  121.5W 2.5-4.6 BAAAA  Central California          

 

The last earthquake of M>=3.5 within about 50 km of today's M 3.5 south of San Francisco occurred April 16, 2018 with M 3.8 and prior to that as an M 3.9 on December 27, 2017. Forecast 120755 had expected this event within about 10 km of the epicenter was likely at the end of October.

 

O:  2NOV2018 11:10:59  37.3N  121.5W Ml=3.5  EMSC   NORTHERN CALIFORNIA          

P: 28OCT2018 120755    37.3N  121.6W 2.5-4.4 BAAAA  Central California         

 

The strongest earthquakes in the world today were located in the regions of the Kuril Islands and Japan. An M 5.9 in the area northwest of the Kuril Islands was not reported felt in this remote area while an M 5.4 in the Kobe, Japan area of southwestern Honshu was widely felt. The last earthquake of M>=5.9 within the Kuril Islands within about 200 km of today's epicenter occurred as an M 7.7 on August 14, 2012 and prior to that on November 7, 2004 with M 6.1-6.2. Earthquakes in this region are generally in the depth range 400-600 km and are seldom felt. Forecast 120833 had expected this event within  this region was likely around the end of October.

 

The earthquake of M 5.4 near the South Coast of Western Honshu, Japan was the largest within about 200 km of that epicenter since an M 5.5 quake on June 17, 2018 and prior to that an M 6.0 on April 1, 2016. Strong quakes hit the region as an M 7.2 on September 5, 2004 and the Kobe quake of M 6.9 on January 16, 1995. That event caused massive damage  and casualties in the Kobe, Japan region. Forecast 120759 had expected this event within about 100 km of the epicenter likely in the later days of October or early November.

 

NEIC reported today's earthquake of M 5.4 in Southwestern Honshu, Japan was felt with intensity II-III in the area(s) of Tokushima, Osaka, Kobe, Hyogo, Kagawa, Kyoto,  and in general within about 150 km of the epicenter.

 

O:  2NOV2018 07:53:54  33.7N  135.2E Mw=5.4  EMSC   NEAR S. COAST OF WESTERN HONSH

P: 26OCT2018 120759    34.0N  136.0E 3.5-5.1 CAAAA  Central/So. Honshu Japan   

 

O:  2NOV2018 11:01:15  47.8N  146.7E Mw=5.9  EMSC   NORTHWEST OF KURIL ISLANDS   

P: 30OCT2018 120833    49.0N  143.0E 3.5-5.5 ABBAA  So. Kurils                 

 

 

STRONG EARTHQUAKES CONTINUE AT 102-103 DEGREES FROM IONIAN SEA

 

EARTHQUAKE SUMMARY FOR NOVEMBER 1, 2018

 

Two moderately strong to strong earthquakes hit in the world today. These events of M 5.7-6.0 in the South Sandwich Islands and M 6.2 in northern Chile near Tarapaca. These two epicenters are both at 101-103 degrees from the M 6.8 event of October 25 in the Ionian Sea of Greece. Large earthquakes emit energy which reflects and refracts off the core-mantle and is redirected to the surface. It arrives back at the surface in the 101-104 degree range. As many large earthquakes occur in the short-term at this distance from major quakes, it is likely that these area promoted or triggered by this concentrated energy from the event near 103 degrees away.

 

The earthquake of M 6.2 in Northern Chile today was reported felt with moderate intensity VII in Iquique, Tarapaca, Chile and VI in Arica, Tarapaca, Chile. Intensity IV was felt in Tacna, Peru and in Chile at Tocopilla, Calama, Antofagasta and II-III in Moquegua, Peru and in Arequipa.   CSN reported this earthquake was felt with intensity V in  Arica and Parinacota at Arica, Codpa, Cuya, Pocon Chile and IV in Putre; Tarapaca V at Alto Hospicio, Camina, Colchane, Iquique, La Tirana, Pica, Pozo Almonte and IV in Huara and Ujina; Antofagasta IV in Calama, Maria Elena, Illague, Quillagua, Tocopilla and III in Mejillones, Chile. GUC reported no major damage or casualties with this earthquake. IGP reported this earthquake was felt with intensity IV in  Tacna, III Ilo; II Arequipa, Peru. This is the largest earthquake in the northern Chile region of Tarapaca within about 200 km of this epicenter since an M 6.2-6.3 January 21, 2018 and a similar event on October 10, 2017. The last event of significantly larger magnitude in the region occurred on March 23, 2014 with M 6.4. These may be regional aftershocks of an M 8.2 which hit at shallow depth on April 1, 2014 about 200 km southwest of today's epicenter. Forecast 120887 had expected this earthquake within about 100 km of the epicenter was likely around October 29. This epicenter is at 102-103 degrees from recent major earthquakes in the Ionian Sea and the M 8.2 and M 7.8 in the Fiji Islands of August and September, 2018 and was probably promoted from those sources.

 

O:  1NOV2018 22:19:51  19.7S   69.4W Mw=6.2  EMSC   TARAPACA, CHILE              

O:  1NOV2018 22:19     19.7S   69.4W mb=6.2  GUC    Arica and Parinacota at Arica,

O:  1NOV2018 22:19     19.9S   69.9W mb=6.2  IGP    Tacna, III Ilo; II Arequipa, P

P: 29OCT2018 120887    19.0S   69.0W 4.0-5.8 AAAAA  So. Peru/Bolivia           

 

The earthquake of M 5.8-6.0 in the South Sandwich Islands was not felt in that remote area at 102 degrees from the Ionian Sea. The area has been active over the past week in connection with the activity in Greece and has included a strong earthquake in the Drake Passage to the west as well as a series of moderate events in the South Sandwich Islands over the past several days. The last earthquake of M>=5.8 in the South Sandwich Islands within about 200 km

of today's epicenter was an M 6.1 on August 14, 2018 and prior to that an M 6.0 on September 4, 2017.  Forecast 120922 had expected today's quake in this area was likely at the end of October. Like the event in northern Chile this epicenter is at 102-103 degrees from recent major earthquakes in the Ionian Sea and the M 8.2 and M 7.8 in the Fiji Islands of August and September, 2018 and was probably promoted from those sources.

 

O:  1NOV2018 19:30:21  58.2S   25.4W Mw=6.0  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 01NOV2018 19:30:20  58.1S   25.2W mw=5.8  ANSS   Island South Sandwich Islands

P: 27OCT2018 120922    59.0S   26.0W 4.0-5.8 BAAAA  So. Sandwich Islands       

 

Other areas where significant seismic enhancement at 100-104 degrees could occur from the Ionian Sea include the Central Marianas, Guam, Sulawesi, Peru and Chile, the western coasts of Central America and the Gulf of California, Mexico, among others. (see map below). Many of these areas have experienced moderately large to large quakes recently and this trend is likely to continue.

 

The largest earthquake in the U.S. or Canada today was an M 4.9 in the Vancouver, Canada aftershock zone and was followed by an M 4.0. It may have been lightly felt in the epicentral region which is remote. This is the strongest aftershock near Vancouver since the series of strong earthquakes hit the region on October 22 which included an M 5.2 about 10 hours after the mainshocks of M 6.6, 6.8 and 6.5.  Forecast 120836 had expected this event within about 50 km of the epicenter was likely around October 29.

 

O:  1NOV2018 09:59:54  49.2N  129.3W mb=4.1  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 01NOV2018 09:59:48  48.9N  129.7W ML=4.0  NRCA  259 km SW  of Pt. Hardy

O: 01NOV2018 04:22:15  49.0N  129.8W ML=4.9  NRCA  256 km SW  of Pt. Hardy

P: 29OCT2018 120836    48.9N  129.3W 2.8-5.2 AAAAA  Vancouver Island area