MAJOR M 7.2 IN KERMADEC ISLANDS REPLATED TO PERU

 

EARTHQUAKE SUMMARY FOR JUNE 15, 2019

 

An M 7.2 earthquake in the Kermadec Islands of New Zealand today followed about an hour after an M 6.1 to the north in Tonga. The Kermadec events was associated with a series of moderate to large aftershocks including an M 6.4. This activity

was not reported felt in the remote epicentral region. The epicenter is located at 99 degrees from the M 8.0 in Peru of May 26 and was probably triggered by concentrated seismic energy from that event. Readers of this summary know that

the distance 101-103 degrees is often cited as a distance at which seismic waves reflected and refracted off the core-mantle boundary return to the surface and are concentrated. For deep focus earthquakes, the path is slightly different

and the focus on or near the surface of the reflections and refractions is near 99 degrees. It was for this reason that this summary has emphasized this region as a prime target for seismic triggering from Peru. This was last noted in the previous issue when an M 5.0 foreshocks hit the Kermadec Islands as:

 

 

"The Tonga-Fiji-Kermadec arc in the southwestern Pacific continued to see enhanced seismicity today with a series of moderate events along the area from Tonga and Samoa south to the Kermadec Islands. Following the M 8.0 in Peru of May 26, this summary has argued that this arc was likely to see strong triggering due to its distance (100-104 degrees) from the Peruvian epicenter. This appears to be the case with a number of moderate quakes in New Zealand in recent days. An example of this was noted on May 30, 2019 in this summary as:

 

"... three moderate earthquake in New Zealand - in the Kermadec Islands of M 5.0 and in North Island of 4.2 and 4.4-4.5. ...  This activity is at 101-102 degrees from the M 8.0 in Peru of May 26 and was probably promoted by concentrated seismic energy from that event, as expected in previous issues of this summary:

 

The 103 distance from Peru passes through the epicenter of the M 6.1 in the Andreanof Islands which occurred about a day before Peru; through the Komandorsky Islands of Russia, south to the Tonga-Fiji arc and through New Zealand where a

moderate to large earthquake could be promoted in the near term. In the east it passes along the East African Rift north to western Turkey and the Anatolian region." (May 26-27, May 29-30, June 1, 10, 15,  2019)

 

The M 7.2 in the Kermadec Islands occurred within minutes of local solar noon and was probably promoted by tidal stresses which maximize at this hour. The current tidal forecast for the coming full moon reads:

 

"The full moon will arrive on June 17 at 08:31 U.T. Longitudes which area sub-solar at this time are near 52 East and those anti-solar at 128 West longitude. These include area of Iran and the Caucasus in Asia and Europe and the west coast of the U.S. in the west. These are regions most likely to see tidal promotion of seismicity during the coming week. Other areas can also see tidal triggering. These are most likely near local solar midnight and noon and generally include areas of vertical tectonics such as subduction zones." (June 15-16, 2019)

 

The earthquake of M 7.2 in the Kermadec Islands, New Zealand is the largest in the world since an M 8.0 on May 26 beneath Peru. It is also the strongest in the Kermadec Islands since an M 7.4 on October 21, 2011 and the strongest within about 150 km of this epicenter since an M 7.4 on May 16, 2006.  A series of forecasts (116597, 116600, 116813 and 116816) had expected this activity in mid-June.

 

O: 16JUN2019 03:02:38  30.7S  178.1W Mw=5.3  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 15JUN2019 22:54:59  30.8S  178.0W Mw=7.2  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 15JUN2019 23:07:20  30.8S  178.1W mb=5.3  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 15JUN2019 23:59:59  30.9S  177.7W mb=5.0  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 16JUN2019 00:12:50  30.9S  178.0W mb=4.6  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 16JUN2019 01:29:38  31.0S  177.7W mb=5.0  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 16JUN2019 05:17:15  31.1S  178.1W Mw=6.4  EMSC   KERMADEC ISLANDS REGION      

P: 11JUN2019 116597    30.0S  178.0W 4.0-5.4 BAAAA  No. Kermadec Islands       

P: 11JUN2019 116600    31.0S  180.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

P: 14JUN2019 116813    30.0S  178.0W 4.0-6.4 AAAAA  No. Kermadec Islands       

P: 15JUN2019 116816    31.0S  178.0W 4.0-5.5 AAAAA  So. Kermadec Islands       

 

The M 7.2 in the Kermadec Islands was preceded about an hour earlier by an M 6.1 in the central Tonga Islands. It was not reported felt in this remote epicentral area. This event may have been a regional trigger for the succeeding M 7.2 to the south. The area has been active in recent days with a series of moderate events. The last of M>=6.1 however within about 150 km of this epicenter occurred to the north on December 23, 2018 and prior to that as an M 6.1 on November 10, 2018 after a three year lull at this magnitude level since July 6, 2015 (M 6.2). Forecast 116806 had expected this event within about 100 km of the epicenter was likely around June 14.

 

O: 15JUN2019 21:56:12  21.1S  174.6W Mw=6.1  EMSC   TONGA                        

P: 14JUN2019 116806    20.0S  175.0W 4.0-5.9 ABAAA  Tonga Islands              

 

An unusual earthquake of M 3.6 in southern Texas was the strongest in the U.S. or Canada today. It occurred about two hours after the M 7.2 in the Kermadec Islands at a distance (97 degrees) suggesting triggering effects from that event. This is the strongest earthquake within about 150 km of this epicenter since an M 4.8 on October 20, 2011.

 

NEIC reported this earthquake of M 3.6 in Southern Texas was felt with intensity IV in Gillet, Texas and Hobson, Poth, Falls City, Kames City, Floresville, Campbellton and San Antonio, Texas.

 

O: 16JUN2019 01:07:18  29.0N   98.0W mb=3.6  EMSC   SOUTHERN TEXAS               

 

An unusual swarm of earthquake in southern Colorado today included an M 2.5. This activity near Alamosa East, Colorado began with an M 1.3 at local solar midnight and was probably promoted by tidal stresses which maximize at this hour. The last earthquake within about 50 km of this epicenter in Colorado with M>=2.5 was an M 3.6 on February 28, 2019. This epicenter is at 102 degrees from the M 7.5 in New Britain of May 14 and at the seventh node  (51.4 degrees) from Peru  may have been promoted from those events. Forecast 116688 had expected this event was likely within this area around June 15.

 

NEIC reported this earthquake of M 2.5 in Colorado was felt with intensity II-III in the area(s) of Mosca, Colorado.

 

O: 15JUN2019 16:57:17  37.7N  105.5W ml=1.7  ANSS   Alamosa East Colorado

O: 15JUN2019 13:30:23  37.7N  105.5W ml=1.5  ANSS   Alamosa East Colorado

O: 15JUN2019 08:45:49  37.7N  105.5W ml=1.1  ANSS   Alamosa East Colorado

O: 15JUN2019 08:37:06  37.6N  105.5W ml=1.7  ANSS   Alamosa East Colorado

O: 15JUN2019 08:18:50  37.7N  105.5W ml=2.5  ANSS   Alamosa East Colorado

O: 15JUN2019 07:43:03  37.6N  105.5W ml=1.2  ANSS   Alamosa East Colorado

O: 15JUN2019 07:42:18  37.6N  105.5W ml=1.4  ANSS   Alamosa East Colorado

O: 15JUN2019 06:54:25  37.6N  105.6W ml=1.3  ANSS   Alamosa East Colorado

P: 15JUN2019 116688    37.3N  104.8W 2.0-4.3 AAAAA  Colorado area              

 

 

 

 

BANDA SEA QUAKE FELT IN NORTHERN  AUSTRALIA

 

EARTHQUAKE SUMMARY FOR JUNE 14, 2019

 

The strongest earthquake in the world today was an M 5.6-5.7 in the Banda Sea of Indonesia. NEIC reported it was felt in Northern Territory, Australia with intensity II-III in Coonawarra, Darwin, Howard Springs and Humpty Doo-MacMinns Lagoon, Northern Territory, Australia. Moderate to strong deep focus earthquakes in the Banda Sea are often felt lightly in the Northern Territory of Australia.   The last earthquake of larger magnitude

within about 200 km of this epicenter occurred more than a year ago as an M 6.4 on March 25, 2018, Forecast 116641 expected today's event was likely around June 15.

 

When the event occurred on March 25, 2018, this summary noted the felt area as:

 

"The M 6.6 was reported by NEIC to have been felt with intensity III in East Timor at Baucau and Dili and in Northern Territory, Australia

with III-IV in Coonawarra, Palmerston, Darwin, Howard Springs, Humpty-Doo-MacMinns Lagoo, Maningrida, and Katherine and in Kununurra, Wester Australia.

BMG reported it was felt in Indonesia with intensity III-IV in Saumlaki; III in Sorong and Kaimana, Maluku, Indonesia. The regional foreshock of M 5.6 was also reported felt with intensity II-III in Northern Territory, Australia at Coonawarra, Darwin and Humpty Doo-MacMinns Lagoon.

Earthquakes in the Banda Sea often shake northern Australia due to local conditions and the deep focus of the Banda Sea events." (March 26, 2018)

 

O: 14JUN2019 20:10:53   5.9S  130.8E Mw=5.7  EMSC   BANDA SEA                    

P: 15JUN2019 116641     6.0S  130.0E 4.0-5.5 AAAAA  West Irian, PNG            

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in north-western Alaska. NEIC reported it was felt with intensity III in Galena, Alaska. This is the strongest aftershock within about 150 km of this epicenter since an M  Forecast 116774 had expected a moderate aftershock up to M 4.6 in the region was likely around June 14. The mainshocks in this area were of M 5.2 on March 6 and March 26, 2019 after more than 10 years of quiet seismicity in the region.

 

O: 15JUN2019 06:56:52  66.3N  157.0W ML=3.1  EMSC   NORTHERN ALASKA              

O: 15JUN2019 06:31:36  66.3N  157.2W Mw=4.6  EMSC   NORTHERN ALASKA              

P: 14JUN2019 116774    65.0N  155.0W 3.0-4.6 ABAAA  Northern Alaska            

 

The Tonga-Fiji-Kermadec arc in the southwestern Pacific continued to see enhanced seismicity today with a series of moderate events along the area from Tonga and Samoa south to the Kermadec Islands. Following the M 8.0 in Peru of May 26, this summary has argued that this arc was likely to see strong triggering due to its distance (100-104 degrees) from the Peruvian epicenter. This appears to be the case with a number of moderate quakes in New Zealand in recent days. An example of this was noted on May 30, 2019 in this summary as:

 

"... three moderate earthquake in New Zealand - in the Kermadec Islands of M 5.0 and in North Island of 4.2 and 4.4-4.5. ...  This activity is at 101-102 degrees from the M 8.0 in Peru of May 26 and was probably promoted by concentrated seismic energy from that event, as expected in previous issues of this summary:

 

The 103 distance from Peru passes through the epicenter of the M 6.1 in the Andreanof Islands which occurred about a day before Peru; through the Komandorsky Islands of Russia, south to the Tonga-Fiji arc and through New Zealand where a moderate to large earthquake could be promoted in the near term. In the east it passes along the East African Rift north to western Turkey and the Anatolian region." (May 26-27, May 29-30, June 1, 10,  2019)

 

The last earthquake of M>=5 in the Kermadec Islands within about 150 km of today's epicenter was an M 5.3 on June 13, 2019. Forecasts 116813 and 116816 had expected this activity was likely around June 14-15.

 

 

O: 14JUN2019 21:04:04  30.3S  177.8W mb=5.0  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 14JUN2019 116813    30.0S  178.0W 4.0-6.4 AAAAA  No. Kermadec Islands       

P: 15JUN2019 116816    31.0S  178.0W 4.0-5.5 AAAAA  So. Kermadec Islands       

 

O: 14JUN2019 17:46:06  13.5S  170.5W mb=4.6  EMSC   SAMOA ISLANDS                

P: 15JUN2019 116787    15.0S  173.0W 4.0-5.4 ABBAA  Samoa Islands              

 

O: 15JUN2019 01:04:27  15.3S  177.1W mb=4.7  EMSC   FIJI REGION                  

P: 14JUN2019 116792    16.0S  173.0W 4.0-5.5 AACAA  Tonga Islands              

 

O: 14JUN2019 07:54:22  17.9S  178.1W mb=4.9  EMSC   FIJI REGION                  

P: 17JUN2019 116792    18.0S  178.0W 4.0-5.5 AAAAA  Tonga Islands              

 

A strong series of moderate sized earthquakes occurred in the area off the coast of Chiapas, Mexico today. The largest of these occurred with M 5.0 and 5.1 one within about five minutes of local solar noon and was probably promoted by tidal stresses which maximize at this hour. This is the strongest activity in Chiapas since an M 5.4 on March 5, 2019 and an M 6.6 on February 1, 2019.  Forecast 116645 expected this activity in mid-June.

 

O: 14JUN2019 17:08:58  14.3N   93.3W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 14JUN2019 16:58:54  14.3N   93.3W ML=4.2  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 14JUN2019 18:27:53  14.4N   93.0W mb=4.2  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 14JUN2019 18:36:26  14.4N   93.0W mb=4.7  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 14JUN2019 18:13:04  14.4N   93.0W mb=5.0  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 14JUN2019 16:34:45  14.4N   93.2W mb=4.6  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 14JUN2019 17:42:43  14.4N   93.3W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 14JUN2019 17:11:53  14.4N   93.3W ML=4.1  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 14JUN2019 18:30:55  14.4N   93.3W ML=4.2  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 14JUN2019 16:26:32  14.5N   92.9W Mw=5.1  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 15JUN2019 04:06:17  14.5N   93.7W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 14JUN2019 07:06:31  14.6N   93.0W mb=4.4  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 14JUN2019 19:17:50  15.0N   93.6W ML=4.2  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 14JUN2019 17:22:02  14.3N   93.3W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 19JUN2019 116645    14.0N   93.0W 3.5-5.2 BAAAA  Chiapas, Mexico            

 

STRONG QUAKE SHAKES COQUIMBO, CHILE

 

EARTHQUAKE SUMMARY FOR JUNE 13, 2019

 

The strongest earthquake in the world today occurred as an M 6.4 off the coast of Coquimbo, Chile. NEIC reported it was felt with intensity IV in Coquimbo and II-III in La Serena, Ovalle, Vicuna, Lampa, Santiago and San Bernardo, Chile and in San Juan, Argentina. CSN reported the M 6.3 was felt with intensity  IV in  Coquimbo at Andacollo, Coquimbo, La Serena and III in Paiguano and Vicuna, Chile. It was preceded several hours earlier by an M 5.0 foreshock which was felt with intensity V in Ovalle, Coquimbo and II-III in Vicuna, and Santiago, Chile and in San Juan, Argentina. CSN reported the M 4.8 was felt with intensity  IV in  Atacama at Freirina and Vallenar; III in Alto del Carmen, Cop;iapo, Huasco, Los Loros, Tierra Amarilla; Coquimbo with III in Coquimbo, La Higuera, La Serena and Vicuna, Chile. NEIC also reported an earthquake of M 4.1 in Valparaiso, Chile was felt with intensity II-III in the area(s) of Limache and Santiago, Valparaiso, Chile.  The M 6.4 is the strongest earthquake within about 200 km of this epicenter since and M 6.7 on January 20, 2019 and prior to that an M 6.9 on November 11, 2015. Forecast 116596 had expected today's event was likely in the Coquimbo area around

June 11.

 

O: 13JUN2019 16:12:31  28.7S   71.3W Mw=4.8  EMSC   ATACAMA, CHILE               

O: 14JUN2019 04:21:23  30.0S   72.1W ML=4.6  EMSC   OFFSHORE COQUIMBO, CHILE     

O: 14JUN2019 00:19:11  30.1S   72.0W Mw=6.4  EMSC   OFFSHORE COQUIMBO, CHILE     

O: 14JUN2019 00:19:12  30.1S   72.1W mw=6.4  ANSS   W of Coquimbo Chile

O: 14JUN2019 01:38:25  30.1S   72.2W Mw=4.5  EMSC   OFFSHORE COQUIMBO, CHILE     

O: 14JUN2019 00:24:13  30.1S   72.3W ML=4.0  EMSC   OFFSHORE COQUIMBO, CHILE     

O: 13JUN2019 22:50:10  30.4S   71.4W mb=5.0  EMSC   COQUIMBO, CHILE              

O: 13JUN2019 16:12     28.8S   71.5W mb=4.8  GUC    Atacama at Freirina and Vallen

O: 14JUN2019 00:19     30.1S   72.2W mb=6.3  GUC    Coquimbo at Andacollo, Coquimb

P:  6JUN2019 116596    30.0S   71.0W 4.0-5.4 AAAAA  Coast Central Chile        

P: 11JUN2019 116596    30.0S   69.0W 4.0-5.5 AABAA  Coast Central Chile        

 

The strongest earthquake in the U.S., Canada or vicinity today was an M 4.4 in the northern Gulf of California. It was not reported felt in this remote area. This event appears to be a continuation of the activation of the region of California which has been ongoing through much of early June. It is the strongest event in this area of the Gulf of California since an M 5.2 on April 6, 2019 and  prior to that an M 4.5 on July 28, 2018. Forecast 116463 had expected this event within about 50 km of the epicenter was likely around June 7.

 

O: 13JUN2019 21:02:40  30.4N  114.6W ML=3.1  EMSC   GULF OF CALIFORNIA            

O: 13JUN2019 20:52:42  30.7N  114.1W mb=4.4  EMSC   GULF OF CALIFORNIA           

P:  7JUN2019 116463    30.2N  114.1W 2.0-4.1 CAAAA  SW U.S.A                   

 

M 3.4 IN PENNSYLVANA CONTINUES NORTHEAST U.S. ACTIVATION

 

EARTHQUAKE SUMMARY FOR JUNE 12, 2019

 

The active period in the northeastern U.S. continued today with an M 3.4 and an aftershock of M 1.4 in the Mifflintown, Pennsylvania. This event was widely felt in Pennsylvania according to NEIC. Intensity II-III was reported from Pennsylvania at Honey, Grove, Ickesburg, Port Royal, Blain, East Waterford, Elliotsvurg, Mifflin, New Germantown, Landisburg, and Lewistown, It was also reported felt as far as New Jersey, Maryland, Virginia, New York, Connecticut, Massachusetts, Ohio,  and Michigan and in general within about 500 km of the epicenter. This follows an M 4.0 in Ohio two days ago and an M 3.0 in Quebec before that. Today's event is about 200 km east of the Ohio quake but is probably not an aftershock. Today's event is the strongest in western  Pennsylvania within about 200 km of this epicenter since a similar M 3.4 on July 16, 2010 and  prior to that an M 3.4 on December 27, 2008. The only events of larger magnitude in the area in the past 30 years was an M 4.2 and M 4.6 on January 16, 1994 hours before the M 6.7 in Northridge, California. There is a history of earthquakes in this area being associated with significant seismicity in the region of California and has often been noted in this summary. When the earthquake in Ohio occurred this summary noted:

 

"Half a day after the event in Quebec, an M 5.0 occurred in the antipodal  area of Quebec in the southeast Indian Ridge, Indian Ocean. It is notable as it occurred within about 300 km of the exact antipode (compare 47S 103E with 47S 105E) in an area of generally light seismicity, The exact nature (if any) of this antipodal pair is not clear at this time. This is the

strongest earthquake within about 300 km of the epicenter in the Southeast Indian Ridge since an M 5.3 on December 10, 2017 and prior to that an M 5.1 on May 29, 2015." (June 8-9, 2019)

 

and

 

"This appears to be part of the activation of the region of California which has been described in the previous issues of this summary. Activation  of this region is often accompanied by activation in the northeastern U.S. and Quebec, Canada regions, an area where unusual seismicity in Ohio to Quebec has occurred over the past several days and both areas may see this continue for several more days." (June 11-12, 2019)

 

When the M 3.4 hit Pennsylvania in December, 2008 this summary also noted the relation with seismicity in California as:

 

"An unusual earthquake of M 3.4 hit Pennsylvania yesterday along with an M 4.5 in northern California and an M 5.9 in Vancouver. These events together show a major shaking episode for North America. such episodes often include a strong

earthquake" (December 27, 2008)

 

and

 

"It is uncommon for a series of moderate earthquake to his throughout the region. Often, especially when one epicentral area is located in Pennsylvania such groups of events in the eastern U.S. are followed by a large or major earthquakes along the western North American and Pacific plate boundary in California" (October 25-26, 2009) and

 

O: 13JUN2019 00:30:57  40.4N   77.5W mb=3.4  EMSC   PENNSYLVANIA                 

O: 13JUN2019 01:32:37  40.4N   77.5W ml=1.4  ANSS   SSW of Mifflintown Pennsylvania

P: 10JUN2019 116510    42.0N   80.0W 2.0-4.1 BBBAA  Ohio/Lake Erie             

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 southwest of Northridge, California about 23 minutes before the event in Pennsylvania. NEIC reported it was felt with intensity II-III in California at Newbury Park, Point Mugu, Oxnard, Camarillo, Westlake Village, Port Hueneme, California among others. This appears to confirm the association between earthquakes in this area and those in the northeast U.S. (see above). The last similar event in Pennsylvania occurred in association with the M 5.3 in the Channel Islands of April 5, 2018 and had been noted in this summary at the time. Today's M 3.7 in the Channel Islands is the strongest within about 50 km of this epicenter since an M 4.0 on May 30, 2012. Forecast 116471 had expected this activity around June 6.

 

O: 13JUN2019 00:07:33  34.1N  119.0W Ml=3.7  EMSC   CHANNEL ISLANDS REG., CALIFORN

P:  6JUN2019 116471    34.4N  118.6W 2.5-4.4 CAAAA  So. California             

 

The strongest earthquake in the world today was an M 5.6 in the southern Mid-Atlantic Ridge. It was not felt in this remote area. A similar M 5.6-5.7 occurred on April 16, 2019, the first such event within about 250 km of this epicenter since quakes of M 7.0  on June 17, 2015 and an aftershock of 5.6-5.7 on July 2, 2015.

 

O: 13JUN2019 03:00:30  35.7S   17.2W Mw=5.6  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

 

TWO MODERATE QUAKES IN CALIFORNIA AND NEVADA OCCUR NEAR LOCAL SOLAR NOON

 

EARTHQUAKE SUMMARY FOR JUNE 11, 2019

 

The strongest earthquake in the world today was an N 5.2-5.3 in Pakistan. NEIC reported this earthquake of M 5.2-5.3 in Pakistan was felt with intensity V in Muzafferabad, Pakistan; IV in Baffa and Swabu, Northwest Frontier, Pakistan and II-III in the area(s) of Abottabad and Peshawar, Pakistan. This is the largest earthquake in Pakistan within about 150 km of this epicenter since an M 5.4 on October 1, 2016 and prior to that an M 5.4 on July 2, 2015. The last such earthquake in this area with M>5.5 was an 7.6 on October 8, 2005 and aftershocks. Today's event may be a regional aftershock of the 2005 event. Forecasts 116448 had expected activity in this area around June 8. This earthquake occurred as Tropical Cyclone Vayu was active along western Peninsular India south of this epicenter as noted in this summary:

 

"Tropical Cyclone Vayu (02A) continued today in the north Indian Ocean west of Peninsular India with winds up to 105 kts. It is expected to track along the Indian coast for the next several day turning to the west around June 13. Seismicity in the Himalayas, Pakistan and northern India is likely to  be enhanced while this storm is active." (June 8-11, 2019)

 

O: 12JUN2019 03:10:28  34.7N   73.0E mb=5.2  EMSC   PAKISTAN                     

O: 12JUN2019 03:10:27  34.7N   72.9E mb=5.3  ANSS   W of Batgram Pakistan        

P:  8JUN2019 116448    36.0N   71.0E 3.8-5.3 BBBAA  Hindu Kush/Pakistan        

P:  8JUN2019 116448    38.0N   74.0E 3.8-5.4 BCAAA  Hindu Kush/Pakistan        

 

The strongest earthquake in the U.S. or Canada outside Alaska today was an M 4.1 in the Geysers, California. NEIC reported intensity IV in Middletown and Hopland and II-III in Geyserville, Kelseyville, Cloverdale, Healdsburg, Glenhaven, Calistoga, Windsor and Angwin, California among others. An M 4.1 also occurred in Nevada today. NEIC reported it was felt with intensity II-III in Beatty, Nevada. The earthquake in they Geysers occurred 17 minutes after the M 4.1 in Nevada and may have been triggered by energy from that event. Both occurred within minutes of local solar noon, a prime time for tidal triggering which maximizes at this hour. This appears to be part of the activation of the region of California which has been described in the previous issues of this summary. Activation of this region is often accompanied by activation in the northeastern U.S. and Quebec, Canada regions, an area where unusual seismicity in Ohio to Quebec has occurred over the past several days and both areas may see this continue for several more days. The earthquake of M 4.2 in Nevada is the strongest within  about 100 km of this epicenter since an M 4.7-4.8 on February 14, 2015 and prior to that an M 4.4 on September 30, 2010. The last such event closer to today's epicenter was an M 4.6 on June 14, 2002. Most of this activity is located at 90 degrees (node 4) from the M 7.5 in New Britain of May 14 and was probably promoted from that source.

 

O: 11JUN2019 18:36:53  37.5N  116.7W ML=2.9  EMSC   NEVADA                       

O: 11JUN2019 07:24:20  37.5N  116.7W ML=4.2  EMSC   NEVADA

O: 11JUN2019 07:29:19  37.5N  116.7W ml=2.8  EMSC   NEVADA

P:  5JUN2019 116469    35.9N  117.7W 2.5-4.4 CBAAA  So. California             

 

One other earthquake of M>=4.1 occurred in the Geysers, California area in the past year - an M 4.1 on April 15, 2019. The last of significantly larger magnitude in the area was an M 5.0 on December 14, 2016. Forecasts 116442 qand 116441 had expected this activity in the Geysers area around June 7-11.

 

O: 11JUN2019 07:46:25  38.8N  122.8W Mw=4.1  EMSC   NORTHERN CALIFORNIA          

O: 11JUN2019 07:48:33  38.8N  122.8W Md=2.0  EMSC   NORTHERN CALIFORNIA

O: 11JUN2019 07:49:47  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 11JUN2019 07:50:51  38.8N  122.8W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 11JUN2019 08:00:38  38.8N  122.8W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 11JUN2019 11:43:12  38.8N  122.8W Md=2.2  EMSC   NORTHERN CALIFORNIA

P:  7JUN2019 116442    38.8N  122.7W 2.5-4.4 BAAAA  Central California         

P: 11JUN2019 116441    38.0N  122.3W 2.5-4.8 AAAAA  Central California         

 

 

The strongest earthquake today in Alaska was an M 4.7 in the Near Islands, Aleutians, Alaska. Two earthquakes of M>=4.7 have occurred in the Near Islands in the past year – both of M 5.1 on March 6 and February 3, 2019. Forecast 116538 had expected today's event was likely around June 7.

 

O: 12JUN2019 04:39:48  52.2N  174.9E mb=4.7  EMSC   NEAR ISLANDS, ALEUTIAN ISLANDS

P:  7JUN2019 116538    51.0N  177.0E 4.0-5.6 BBBAA  Rat Islands                

 

MODERATE QUAKE SHAKES OHIO

 

EARTHQUAKE SUMMARY FOR JUNE 10, 2019

 

The strongest earthquake in the U.S. or Canada outside Alaska today occurred in Lake Erie, Ohio. NEIC reported maximum intensity IV in Ohio at Eastlake, Wickliffe, Euclid, Mentor, Willoughby and II-III in Cleveland, and within about 60 km of the epicenter in Ohio. Two days ago when an M 3.0 occurred in Quebec, Canada east of today's epicenter this summary noted:

 

"Half a day after the event in Quebec, an M 5.0 occurred in the antipodal  area of Quebec in the southeast Indian Ridge, Indian Ocean. It is notable as it occurred within about 300 km of the exact antipode (compare 47S 103E with 47S 105E) in an area of generally light seismicity, The exact nature (if any) of this antipodal pair is not clear at this time. This is the

strongest earthquake within about 300 km of the epicenter in the Southeast Indian Ridge since an M 5.3 on December 10, 2017 and prior to that an M 5.1 on May 29, 2015." (June 8-9, 2019)

 

It is likely the event in Ohio was likely affected by the event in the South Indian Ridge. The last earthquake within about 150 km of this event in Ohio with M>=4 was an M 4.4 on January 26, 2011. The only other such event in Ohio in the past 30 years was an M 4.5 on September 25, 1998. Forecast 116510 had expected this earthquake within this area was likely around June 10.

 

O: 10JUN2019 14:50:44  41.7N   81.5W mb=4.0  EMSC   LAKE ERIE, OHIO              

O: 10JUN2019 14:50:45  41.7N   81.5W MB=4.0  ECAN Ohio 

P: 10JUN2019 116510    42.0N   80.0W 2.0-4.1 AAAAA  Ohio/Lake Erie             

 

The largest earthquakes in Alaska today were an M 4.3 in the Fox Islands and an M 4.4 in the Alaska Peninsula. They were not reported felt in these remote areas. The earthquake in the Fox Islands was the strongest within about 100 km  of that epicenter since an M 4.6 on April 8, 2019 and prior to that an M 4.6 on November 15, 2018. The last event in the Alaska Peninsula within about 100 km of today's epicenter with M>=4.4 occurred on February 1, 2019 with M 4.4 and prior to  that as an M 5.0 on October 10, 2018. Forecasts 116529 and 116522 had expected today's activity around June 9-10. 

 

O: 10JUN2019 10:42:12  52.7N  167.7W ml=4.3  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  9JUN2019 116529    53.9N  165.3W 3.5-5.0 ABBAA  Fox Islands, Aleutians     

 

O: 10JUN2019 13:36:42  56.6N  156.6W mb=4.4  EMSC   ALASKA PENINSULA             

P: 10JUN2019 116522    54.8N  158.7W 3.5-5.2 ABAAA  Alaska Peninsula           

 

A series of light earthquakes followed an M 4.2 in the Dominican Republic today. Forecast 116413 had expected this activity was likely around June 8. This area has been active in recent days but the last events of M>=4.3 occurred on May 2, 2019 and February 5, 2019 - both with M 4.4. This activity is located at 144 degrees from the M 7.2 in New Guinea of May 6, 2019. Seismic energy is concentrated at this distance from large earthquakes  and can help promote further seismicity in this distance zone.

 

O: 10JUN2019 14:23:39  19.3N   68.1W ML=3.3  EMSC   DOMINICAN REPUBLIC REGION    

O: 11JUN2019 01:40:47  19.3N   68.1W ML=3.4  EMSC   DOMINICAN REPUBLIC REGION

O: 10JUN2019 10:04:29  19.3N   68.1W ML=3.5  EMSC   DOMINICAN REPUBLIC REGION

O: 10JUN2019 06:48:57  19.3N   68.1W mb=4.2  EMSC   DOMINICAN REPUBLIC REGION

O: 10JUN2019 06:48:59  19.5N   68.1W mb=4.3  ANSS   DOMINICAN REPUBLIC REGION

O: 11JUN2019 05:58:36  19.4N   68.1W ML=3.3  EMSC   DOMINICAN REPUBLIC REGION

O: 10JUN2019 07:54:18  19.4N   68.2W Md=3.2  EMSC   DOMINICAN REPUBLIC REGION

O: 10JUN2019 10:38:17  19.4N   69.6W ML=3.2  EMSC   DOMINICAN REPUBLIC REGION

O: 10JUN2019 07:45:22  19.5N   68.1W Md=3.0  EMSC   DOMINICAN REPUBLIC REGION

O: 10JUN2019 08:59:35  19.5N   68.1W Md=3.0  EMSC   DOMINICAN REPUBLIC REGION

P:  8JUN2019 116413    19.0N   68.0W 3.4-5.0 AAAAA  Puerto Rico                

 

The strongest earthquakes in the world today were of M 5.4-5.5 in the Mariana Islands and in the Tanimbar region of Indonesia. These are located near the geomagnetic equator and may have been promoted by the recent geomagnetic storm as described in the previous issue of this report:

 

 

"The geomagnetic field saw unsettled conditions today. The AP level was 18. High latitude geomagnetic field also saw unsettled conditions  with AP at 10.  Moderately stromy conditions may come in the geomagnetic field in the next several days. This could enhance global seismicity especially in the geomagnetic equatorial zone." (June 8-10, 2019)

 

Forecasts 116290 and 116409 had expected this activity in early June. NEIC reported the earthquake of M 5.5 in Tanimbar, Indonesia was felt with intensity II-III in the area(s) of Coonawarra and Darwin, Northern Territory, Australia.

 

O: 10JUN2019 16:59:16   6.6S  131.9E Mw=5.5  EMSC   KEP. TANIMBAR REGION, INDONESI

P:  9JUN2019 116390     7.0S  130.0E 4.0-5.4 AABAA  West Irian, PNG            

 

O: 10JUN2019 16:00:00  17.3N  147.8E mb=5.0  EMSC   MARIANA ISLANDS REGION       

O: 10JUN2019 17:14:53  17.4N  147.8E Mw=5.4  EMSC   MARIANA ISLANDS REGION       

P:  3JUN2019 116409    18.0N  146.0E 4.0-5.4 CAAAA  No. Marianas               

 

INDONESIA ACTIVE AFTER MODERATE GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR JUNE 9, 2019

 

While global seismicity remained at generally quiet levels today, the area of Indonesia did show some seismic enhancement. The strongest quakes in the world were of M 5.2 in Java and Papua, Indonesia. These may have been enhanced by active conditions in the geomagnetic field as described in the previous issue of this summary:

 

"The geomagnetic field saw unsettled conditions today. The AP level was 18. High latitude geomagnetic field also saw unsettled conditions  with AP at 10.  Moderately stormy conditions may come in the geomagnetic field in the next

several days. This could enhance global seismicity especially in the geomagnetic equatorial zone." (June 8-9, 2019)

 

O:  9JUN2019 11:53:54   2.8S  139.4E Mw=5.2  EMSC   NEAR N COAST OF PAPUA, INDONES

P:  4JUN2019 116383     3.0S  141.0E 4.0-5.4 BABAA  Papua New Guinea           

 

NEIC reported the earthquake of M 5.2 in Java, Indonesia was felt with intensity II-III in the area(s) of Wengon, Mertoyudan, Cirebon and Kadungora, Java, Indonesia.

 

O:  9JUN2019 09:32:26   8.2S  109.0E Mw=5.2  EMSC   JAVA, INDONESIA              

P: 10JUN2019 116578    10.0S  108.0E 4.0-5.5 ABAAA  So. of Java                

 

An unusual earthquake of M 3.9 occurred today in the North Atlantic Ocean west of Portugal. This is a region where strong, tsunamigenic earthquakes have occurred in the past and could re-occur. At M 3.9 this is the strongest earthquake within  about 250 km of this epicenter in more than 10 years. An M 4.1 occurred on February 28, 2008  The largest quake in the area in the past 30 years was an M 5.0 about 150 km south of today's epicenter on April 23, 2006, the only other such event in the past 20 years. Forecast 116512 had expected today's event in this area was likely around June 9.

 

O:  9JUN2019 12:05:11  44.9N    8.7W ML=3.9  EMSC   NORTH ATLANTIC OCEAN         

P:  9JUN2019 116512    43.0N    7.0W 3.0-5.1 ABAAA  Portugal                   

 

The strongest earthquake in the U.S. or Canada today was an M 3.5 in the Bakersfield, California region.  NEIC reported this earthquake of M  3.5 in Central California was felt with intensity II-III in the area(s) of California at Bakersfield, Lamont, and Keene. The last earthquake of M>=3.5 within about 50 km of today's epicenter in the Bakersfield, California area was an M 3.8 more than a year ago on April 13, 2018 which was followed three days later by a similar event about 50 km to the southwest.  Forecast 116471 had expected today's event was likely within about 25 km of

the epicenter around June 10.

 

O: 10JUN2019 02:41:11  35.4N  118.8W Mw=3.5  EMSC   CENTRAL CALIFORNIA           

P: 10JUN2019 116471    35.4N  118.5W 2.5-4.4 AAAAA  So. California             

 

MODERATELY STRONG QUAKE SHAKES SOUTH ISLAND, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR JUNE 8, 2019

 

An earthquake of M 5.5-5.6 occurred today in the Milford Sound area of South Island, New Zealand. It was followed by an M 4.3 aftershock. This continues activation of the region of New Zealand which began after the M 8.0 in Peru of May 26. This had been expected in this summary as:

 

 

“The 103 distance from Peru passes through the epicenter of the M 6.1 in the Andreanof Islands which occurred abouot a day before Peru; through the Komandorsky Islands of Russia, south to the Tonga-Fiji arc and through New Zealand where a moderate to large earthquake could be promoted in the near term. In the east it passes along the East African Rift north to western Turkey and the Anatolian region." (May 26-27, May 29-30, June 1, 2019)

 

GEONET reported 621 people felt the M 5.5-5.6 with 225 with weak intensity; 313 with light intensity and 79 with moderate intensity. Three reported strong shaking and one extreme intensity. GEONET reported 15 people felt the M 4.3 with 17 with weak intensity; one with light intensity and one with moderate intensity. The M 5.6 is the argest in South Island, New Zealand within about 250 km of  Milford Sound since an M 5.6 on May 4, 2015. The last such event of larger

magnitude was an M 6.1 on August 5, 2009 nearly 10 years ago. Forecast 116604 had expected today's activity was likely around June 7. Today's activity is located at 104 degrees from the M 8.0 in Peru of May 26 and was probably promoted by energy concentration on the surface at this distance from that event.

 

O:  8JUN2019 15:24:08  44.3S  168.1E mb=4.9  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 09JUN2019 02:45:10  44.4S  168.2E ML=4.3  GEONET reported 15 people felt this quake

O: 08JUN2019 15:24:08  44.3S  168.2E ML=5.6  GEONET reported 621 people felt this quake

P:  7JUN2019 116604    44.0S  168.0E 3.0-5.1 AAAAA  So. Island, N.Z.           

 

Two other earthquakes in the Tonga-Fiji area occurred near 103 degrees from Peru today as well. These occurred south of the Fiji Islands with M 5.3 and in the Fiji Islands with M 4.8. Forecasts 116579 and 116592 had expected this activity around June 6-8.

 

O:  8JUN2019 14:11:13  17.7S  178.7W mb=4.8  EMSC   FIJI REGION                  

P:  8JUN2019 116579    18.0S  178.0W 4.0-5.4 AAAAA  Tonga Islands              

 

O:  8JUN2019 14:19:03  25.5S  176.8W mb=5.3  EMSC   SOUTH OF FIJI ISLANDS        

P:  6JUN2019 116592    24.0S  176.0W 4.0-5.4 ABAAA  Tonga Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in the central Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last earthquake within about 100 km of this epicenter with M>=3.9 was an

M 4.1 on June 2, 2019. An M 4.5 on June 6 occurred about 200 km southeast of today's  epicenter in the Andreanof Islands. Forecast 116525 had expected this event was likely around June 6. Like the activity in New Zealand today this

epicenter is at 100 degrees from the M 8.0 in Peru of May 26 and was probably enhanced by energy from that source.

 

O:  8JUN2019 07:10:46  52.6N  174.4W mb=3.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6JUN2019 116525    51.2N  174.4W 3.5-5.2 ABAAA  Andreanoff Isls, Aleutians 

 

MODERATE QUAKES IN KODIAK, ALASKA AND SOUTHEAST INDIAN RIDGE

 

EARTHQUAKE SUMMARY FOR JUNE 7, 2019

 

It was a relatively quiet day in global seismicity. No events of M>5 were recorded. Two earthquakes of M 5.0 occurred - in the Kodiak area of Alaska and in the Southeast Indian Ridge. The later was near antipodal to an M 3.1 in Quebec, Canada which occurred about half a day earlier.

 

The strongest earthquake in the U.S. or Canada today was an M 5.0 in the Kodiak, Alaska region. NEIC reported intensity IV in Ninilchik and III in Homer and Kodiak, Alaska for this event. NEIC reported the aftershock of M 3.9 in Kodiak, Alaska was felt with intensity II-III in the area(s) of Homer, Anchor Point and Kodiak, Alaska. The M 5.0 is the largest event within about 150 km of this epicenter in the Kodiak area since an M 5.2 on January 2, 2009. An M 5.8 occurred about 150 km

northwest of today's epicenter on May 27, 2019, the only other such event in the area in the past 10 years. Today's earthquake is probably a regional aftershock of the May 27 M 5.8.  Forecast 116545 had expected an event to the north of this around June 5.

 

O:  7JUN2019 14:57:31  58.4N  151.4W mb=5.0  EMSC   KODIAK ISLAND REGION, ALASKA 

O:  7JUN2019 15:01:39  58.5N  151.2W ML=3.9  EMSC   KODIAK ISLAND REGION, ALASKA 

P:  5JUN2019 116545    60.2N  151.7W 3.2-4.9 ABAAA  Central Alaska             

 

An unusually large M 3.1 quake (Earthquakes Canada magnitude) hit the region of southern Quebec, Canada today. Earthquakes Canada reported it was felt in the area near L'Annonciation, Quebec. The last earthquake within about 100 km

of today's epicenter in Quebec with M>=3.1 was an M 3.1 on October 19, 2017. The last of larger magnitude was an M 3.7 on September 9, 2015. Forecast 116504 expected today event in this area was likely around June 7. This epicenter is located, like those in southern California at the 7th node (52 degrees) from the M 8.0 in Peru of May 26 and may have been enhanced

by energy from that source.

 

O:  7JUN2019 11:53:14  46.3N   75.0W mb=2.4  EMSC   SOUTHERN QUEBEC, CANADA      

O: 06JUN2019 02:15:47  46.5N   76.4W MB=1.9  ECAN Maniwaki, QC    

O: 07JUN2019 11:53:14  46.3N   75.0W MB=3.1  ECAN L'Annonciation, QC. Felt   

P:  7JUN2019 116504    47.0N   76.0W 2.0-4.0 AAAAA  New York State             

 

Half a day after the event in Quebec, an M 5.0 occurred in the antipodal area of Quebec in the southeast Indian Ridge, Indian Ocean. It is notable as it occurred within about 300 km of the exact antipode (compare 47S 103E

with 47S 105E) in an area of generally light seismicity, The exact nature (if any) of this antipodal pair is not clear at this time. This is the strongest earthquake within about 300 km of the epicenter in the Southeast Indian Ridge since an M 5.3 on December 10, 2017 and prior to that an M 5.1 on May 29, 2015. Forecast 116603 had expected to area would be active around June 11.

 

O:  7JUN2019 23:36:07  47.8S  102.6E mb=4.9  EMSC   SOUTHEAST INDIAN RIDGE       

O:  7JUN2019 23:36:07  47.8S  102.5E mb=5.0  ANSS   SOUTHEAST INDIAN RIDGE       

P: 11JUN2019 116603    46.0S   96.0E 4.0-5.6 BBCAA  So. Indian Ocean           

 

CALIFORNIA ACTIVE PERIOD CONTINUES

 

EARTHQUAKE SUMMARY FOR JUNE 6, 2019

 

Several light earthquakes of interest occurred in the region of California and Nevada today. In addition to the activity in eastern Los Angeles and in the Channel Islands, an M 3.7 also occurred in the Truckee-Virginia City area

of Northern California and Nevada. Light earthquakes continued today in eastern Los Angeles, California. These were reported by NEIC to have been felt with maximum intensity IV in Fontana and II-III in Mira Loma, Riverside, Ontario, Rancho Cucamonga, and Bloomington, California among others within about 25-50 km of the epicenter. This is part of the continuing series which began in late May but appears to be migrating slightly to the south. Forecast 116469 had expected this activity around June 5.

 

O:  7JUN2019 04:34:18  34.0N  117.5W Ml=2.1  EMSC   GREATER LOS ANGELES AREA, CALI

O:  7JUN2019 04:29:16  34.0N  117.5W Ml=2.6  EMSC   GREATER LOS ANGELES AREA, CALI

P:  5JUN2019 116469    34.1N  117.5W 2.5-4.4 AAAAA  So. California             

 

An M 3.5 in the Channel Islands, California was also widely felt today. NEIC reported intensity II-III in San Pedro, Laguna Beach, Mission Viejo, Spring Lake, Altadena, North Hills and within about 100 km of the epicenter. This continues regional activity which yesterday included two earthquakes of  M 4.3, the largest in more than a year in the area. Forecast 116466 had expected this activity in the Channel Islands around June 6-8. This had been detailed in previous issues of this summary, including in the previous issue in regard to the events of M 4.3.

 

O:  6JUN2019 11:25:36  32.8N  118.5W Ml=3.5  EMSC   CHANNEL ISLANDS REG., CALIFORN

O:  6JUN2019 11:18:09  32.9N  118.5W Ml=2.8  EMSC   CHANNEL ISLANDS, CALIFORNIA  

P:  6JUN2019 116466    32.9N  117.6W 2.5-4.4 AAAAA  So. California             

P:  8JUN2019 116466    33.0N  117.7W 2.5-4.4 AAAAA  So. California             

 

The strongest earthquake in California or Nevada today was an M 3.7 in the  Virginia City area of Nevada but also included light earthquakes in the Truckee area of Northern California. The M 3.7 is the strongest within about 50 km of this epicenter since an M 3.8 on August 30, 2018 and prior to that an M 4.0 on June 27, 2017. NEIC reported this earthquake of M 2.9 in northern California was felt with intensity II-III in the area(s) of Truckee, California and in Reno, Nevada and Lincoln, California. NEIC reported this earthquake of M 3.7 in Nevada was felt with intensity II-III in the area(s) of Washoe, Reno, Carson  City, Incline Village, and Dayton, Nevada among others within about 50 km of the epicenter.

Forecast 116436 had expected this activity was likely around June 9.

 

 

O:  7JUN2019 04:49:46  39.3N  119.7W ML=3.7  EMSC   NEVADA                        

O:  7JUN2019 04:42:19  39.3N  119.7W ml=2.0  EMSC   NEVADA                       

O:  7JUN2019 04:36:04  39.3N  119.7W ml=2.4  EMSC   NEVADA                       

O:  7JUN2019 03:43:10  39.4N  120.0W ml=2.3  EMSC   NORTHERN CALIFORNIA          

O:  7JUN2019 03:51:38  39.4N  120.0W ml=2.4  EMSC   NORTHERN CALIFORNIA          

P:  9JUN2019 116436    39.1N  119.6W 2.5-4.6 AAAAA  California/Nevada area     

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the eastern Andreanof Islands. It was not reported felt in this remote area. The last earthquake of M>4.5 within about 150 km of this epicenter occurred as an M 6.1 on March 7, 2019 about 150 km to the west of today's event. Forecast 116525 had expected this activity was likely within about 50 km around June 6.

 

O:  6JUN2019 08:44:39  51.6N  173.9W ml=3.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O:  6JUN2019 08:44:33  51.0N  173.9W ml=4.5  ANSS   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6JUN2019 116525    51.2N  174.4W 3.5-5.2 AAAAA  Andreanoff Isls, Aleutians 

 

UNUSUAL MODERATE QUAKES SOUTH OF LOS ANGELES, CALIFORNIA

 

EARTHQUAKE SUMMARY FOR JUNE 5, 2019

 

Two earthquakes of M 4.3 in the Channel Islands southwest of Los Angeles, California were widely felt today. NEIC reported intensity II-III in California at Avalon, Rancho Palos, San Pedro, Newport, Corona del Mar, Dana Point, Palos Verdes, and Capistrano, California among others. Several light aftershocks were also felt in this area. These included an M 3.3 aftershock. The M 4.3 is the strongest earthquake in the region of the Channel Islands and Los Angeles, California since an M 5.3 on April 5, 2018 in the Channel Islands and prior to that an M 4.4 on December 30, 2015 in eastern Los Angeles. This summary had noted this activity in the previous issue as:

 

 

"An earthquake of M 3.1 also occurred about 50 km southeast of the Los Angeles swarm today. NEIC reported it was felt with intensity II-III in the California areas of Nuevo, Moreno Valley, Perris, San Jacinto, Homeland, Beaumont, and Hemet among other communities within about 50 km of the epicenter. This may be a far-field effect of the M 7.5 in Ecuador of February 22 and had been expected at that time in this summary as:

 

"Earthquakes of this size in Ecuador can help promote seismicity in California several months later. This summary will follow this in future issues." (February 22, 2019)

 

For example an M 6.9 on February 9, 2013 was followed by an M 4.8 in western Los Angeles on May 29, 2013 in western Los  Angeles, the strongest earthquake in that region prior to the M 5.3 on April 5, 2018 and the M 4.3's today.

Similar events in western Los Angeles included an M 4.5 on December 24, 2000, three months after an M 6.4 in Ecuador.

 

The strongest earthquake in the past 24 years in southern California was an M 5.3 on the Channel Islands southwest of Los Angeles on April 5, 2018. The situation is not significantly different from the current circumstances and

had been described in this summary at the time:

 

"the preponderance of evidence is that these mainshocks in New Guinea do trigger subsequent moderate to strong quakes near 103 degrees away in Southern California in the region of Los Angeles or to the east. Given the 22- to 23 year cyclicity

of strong earthquakes in this area, due at this time,  this summary is placing this region under a moderate seismic watch for the next month with the most likely large quakes at the end of March. A seismic watch indicates conditions are right for the development of significantly increased regional seismicity including  the possibility of a strong earthquake in the watch period. The watch period may be extended depending on regional activity. The most likely area would be east of Los Angeles in the general area north of of Landers, California." (February 25, 2018)

 

"As expected in the previous issue of this summary, the area east of Los Angeles was activated by energy from New Guinea." (April 5, 2018)

 

The earthquake in New Guinea of February 25, 2018 was an M 7.5 and occurred about 40 days before the M 5.3 in Southern California. This year's New Guinea event was likewise an M 7.5 and occurred on May 14, 2019 so triggering from this event is likely at this time in Southern California." (June 4-5, 2019)

 

Today's events of M 4.3 each were accompanied by light aftershocks of M 3.3, 2.9 and 2.6. Forecasts 116466 and 116468 had expected this activity was likely in early June. This activity is located at the fourth node (90 degrees) from the M 7.5 in

New Britain of May 14 and at the seventh node (52 degrees) from the M 7.5 in Ecuador of February 22, 2019 and was probably promoted from those sources.

 

O: 05JUN2019 22:33:24  32.8N  118.5W ML=3.3  EMSC   CHANNEL ISLANDS REG., CALIFORNIA

O: 05JUN2019 14:37:35  32.8N  118.5W Ml=2.6  EMSC   CHANNEL ISLANDS REG., CALIFORNIA

O: 05JUN2019 16:13:43  32.9N  118.5W Ml=2.9  EMSC   CHANNEL ISLANDS REG., CALIFORNIA

O:  5JUN2019 10:47:17  32.7N  118.6W Mw=4.3  EMSC   OFF COAST OF CALIFORNIA      

O:  5JUN2019 14:32:09  32.8N  118.5W Mw=4.3  ANSS   OFF COAST OF CALIFORNIA      

P:  2JUN2019 116468    33.6N  118.5W 2.5-4.4 BAAAA  So. California             

P:  6JUN2019 116466    32.9N  117.6W 2.5-4.4 AAAAA  So. California             

P:  8JUN2019 116466    33.0N  117.7W 2.5-4.4 BAAAA  So. California             

 

The strongest earthquake in the world today was an M 5.5 in Mindanao, Philippines. This is the largest earthquake in Mindanao within about 150 km of this epicenter since an M 5.9 on May 10, 2018 and prior to that an M 6.6 on December 2, 2014. Forecast 116357 had expected this earthquake around June 5 in this area of the Philippines.

 

O:  5JUN2019 20:41:49   6.5N  124.2E Mw=5.5  EMSC   MINDANAO, PHILIPPINES        

P:  5JUN2019 116357     7.0N  126.0E 4.0-5.4 AABAA  Central Philippines        

 

MODERATELY STRONG QUAKE SHAKES TAIWAN

 

EARTHQUAKE SUMMARY FOR JUNE 4, 2019

 

The strongest and most widely felt earthquake in the world today was an M 5.6 off the coast of southern Taiwan. NEIC reported maximum intensity V in Taitung and IV in Kaohsiunng, Chiayi and Taichung with lesser shaking of II-III in Tainan, Taichung, Hsintien and Taipei, Taiwan. CWB reported the earthquake of M 5.6 was felt with intensity V in Taitung; IV in Hualien; III in Chiayi, Kaohsiung, Yunlin, Tainan, Taichung, Changhua, II in Pingtung, Nantou, Yilan, Miaoli, and I in Hsinchu, Taoyuan and Taipei Counties, Taiwan. The M 4.1 aftershock was felt with intensity III in Taitung and I in Hualien, Kaohsiung, Nantou, Yunlin and Taichung Counties. The M 4.5 was felt with intensity IV in Hualien; III in Nantou; II in Yilan and I in Taitung, Taichung, Yunlin, Chiayi, Changhua and Hsinchu Counties, Taiwan. The only earthquake in Taiwan of M>=5.6 in the past half year was an M 6.1 on April 18, 2019. Two of M 5.6-5.8  occurred October 23, 2018. Forecast 116430 had expected today's event within about 50 km of the epicenter was likely around June 6.

 

O:  4JUN2019 09:46:18  22.9N  121.7E mb=5.6  EMSC   TAIWAN REGION                

O:  4JUN2019 09:46:19  22.9N  121.6E ML=5.6  TAI    Hualien, Taiwan              

O:  4JUN2019 12:17:01  23.4N  121.6E ML=4.1  TAI    Hualien, Taiwan              

O:  4JUN2019 19:27:21  23.8N  121.6E ML=4.5  TAI    Hualien, Taiwan              

P:  4JUN2019 116429    22.0N  122.0E 4.0-5.6 AAAAA  Taiwan                      

P:  6JUN2019 116430    23.0N  121.0E 4.0-5.6 AAAAA  Taiwan                     

 

The strongest earthquake in the U.S or Canada today was an M 3.9 in the Gulf of Alaska. This continues reactivation of the region noted in the previous issue of this summary as:

 

"The strongest activity in the U.S. or Canada today was a series in the Gulf of Alaska which included an M 4.2, 3.6 and 3.5. It was not reported felt in the area. This is the largest earthquake in the aftershock zone of the M 7.9 which occurred January 23, 2018 since an M 4.9 April 8, 2019." (May 30, 2019)

 

Today's earthquake had been expected in this aftershock zone around June 6.

 

O:  4JUN2019 17:05:10  56.2N  149.2W ML=3.9  EMSC   GULF OF ALASKA               

P:  6JUN2019 116530    54.9N  150.3W 3.5-5.0 ABAAA  Gulf of Alaska             

 

The series of events in eastern Los Angeles, California continued today with an M 2.1 and 2.3. This has been previously discussed in this summary, most recently in the previous issue as:

 

 

An earthquake of M 3.1 also occurred about 50 km southeast of the Los Angeles swarm today. NEIC reported it was felt with intensity II-III in the California areas of Nuevo, Moreno Valley, Perris, San Jacinto, Homeland, Beaumont, and Hemet among other communities within about 50 km of the epicenter. This may be a far-field effect of the M 7.5 in Ecuador of February 22 and had been expected at that time in this summary as:

 

"Earthquakes of this size in Ecuador can help promote seismicity in California several months later. This summary will follow this in future issues." (February 22, 2019)

 

The strongest earthquake in the past 24 years in southern California was an M 5.3 on the Channel Islands southwest of Los Angeles on April 5, 2018. The situation is not significantly different from the current circumstances and had been described in this summary at the time:

 

"the preponderence of evidence is that these mainshocks in New Guinea do trigger subsequent moderate to strong quakes near 103 degrees away in Southern California in the region of Los Angeles or to the east. Given the 22- to 23 year cyclicity of strong earthquakes in this area, due at this time,  this summary is placing this region under a moderate seismic watch for the next month with the most likely large quakes at the end of March. A seismic watch indicates conditions are right for

the development of significantly increased regional seismicity including the possibility of a strong earthquake in the watch period. The watch period may be extended depending on regional activity. The most likely area would be east of Los Angeles in the general area north of of Landers, California." (February 25, 2018)

 

"As expected in the previous issue of this summary, the area east of Los Angeles was activated by energy from New Guinea." (April 5, 2018)

 

The earthquake in New Guinea of February 25, 2018 was an M 7.5 and occurred about 40 days before the M 5.3 in Southern California. This year's New Guinea event was likewise an M 7.5 and occurred on May 14, 2019 so triggering from this event is likely at this time in Southern California.

 

Forecast 116469 had expected today's events in Los Angeles were likely around June 5.

 

O:  4JUN2019 09:29:29  34.1N  117.5W Ml=2.1  EMSC   GREATER LOS ANGELES AREA, CALI

O:  4JUN2019 08:28:19  34.1N  117.5W Ml=2.3  EMSC   GREATER LOS ANGELES AREA, CALI

P:  5JUN2019 116469    34.1N  117.5W 2.5-4.4 AAAAA  So. California             

 

STRONG EARTHQUAKE IN SOUTHERN JAPAN

 

EARTHQUAKE SUMMARY FOR JUNE 3, 2019

 

The strongest earthquake in the world today was an M 6.3 in the Izu Islands, Japan. It was reported lightly felt in Tokyo, but this is unlikely. This is the strongest earthquake within about 200 km of this epicenter since an M 6.3 on June 23, 2015. An M 7.8 hit the region on May 30, 2015. As it was at a deep focus 430 km, damage and  felt effects on the surface were limited to possibly light shaking in Tokyo, Japan. Forecast 116418 had expected this event within about 100 km of this epicenter was likely around June 3.

 

O:  4JUN2019 04:39:17  29.1N  139.3E Mw=6.3  EMSC   IZU ISLANDS, JAPAN REGION    

P:  3JUN2019 116418    29.0N  140.0E 4.0-5.7 AAAAA  Bonin Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in Central Alaska.  NEIC reported this earthquake of M 3.5 in the California Geysers was felt with intensity II-III in the area(s) of California at  Kelseyville, Healdsburg, Windsor, Santa Rosa and Willits. This was an aftershock of an earlier M 3.9 in the Geysers area. That event was

reported by NEIC to have been felt with maximum intensity V in Middletown and IV in Glenhave, California and II-III within about 75 km of the epicenter in Kelseyville, Geyserville, Cloverdale, Healdsburg, Hidden Valley, Clearlake, Calistoga and Angwin, California among others. This is the strongest earthquake in Central Alaska since an M 5.0 on July 10, 2018

and prior to that an M 4.9 on July 1, 2018. Forecast 116292 and 116551 had expected today's activity was likely around

the end of May or in early June between May 28 and June 7.

 

 

O:  3JUN2019 18:05:24  63.1N  150.9W mb=4.3  EMSC   CENTRAL ALASKA               

O:  3JUN2019 14:01:56  63.3N  151.0W ml=3.4  EMSC   CENTRAL ALASKA               

P:  7JUN2019 116551    63.1N  151.9W 3.2-5.1 BAAAA  Central Alaska             

P: 28MAY2019 116292    63.3N  151.0W 3.2-5.1 BAAAA  Central Alaska             

 

An unusually large M 3.9 also occurred today in the Geysers area of Northern California. This is an area where seismicity is modulated by fluids and this M 3.9 was probably enhanced by strong tidal stresses associated with the new moon today.

It is the first event in the area of M>=3.9 since an M 4.1 on April 15, 2019 and prior than that a year ago on May 10, 2018 of M 4.2. Forecast 116552 had expected today's event was likely around June 2.

 

O:  3JUN2019 20:30:42  38.8N  122.8W Md=2.2  EMSC   NORTHERN CALIFORNIA          

O:  4JUN2019 01:53:18  38.8N  122.8W Md=2.4  EMSC   NORTHERN CALIFORNIA          

O:  4JUN2019 04:11:06  38.8N  122.8W Md=2.4  EMSC   NORTHERN CALIFORNIA          

O:  4JUN2019 01:44:21  38.8N  122.8W mb=3.9  EMSC   NORTHERN CALIFORNIA          

P:  2JUN2019 116442    38.8N  122.7W 2.5-4.4 AAAAA  Central California         

 

A series of moderate earthquakes occurred in and north of North Island, New Zealand today. These events are at 101-102 degrees from the M 8.0 in Peru of May 26 and are part of a general activation of the area associated with energy from

that event being concentrated at this distance range. The additional effects of the new moon tidal stresses may have concentrated this seismicity at this time and at least one event was within about 30 minutes of local solar noon.

Forecasts 116598 and 116339 had expected this activity was likely in late May or early June. No damage or casualties were associated with this seismicity which included an M 5.4.

 

O:  3JUN2019 17:24:31  37.2S  179.8E mb=5.4  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 03JUN2019 17:24:38  37.0S  179.2E ML=5.3  GEONET Felt with light intensity

P:  4JUN2019 116598    37.0S  178.0E 3.0-4.6 AABAA  North Island, N.Z.         

 

GEONET reported this earthquake was felt with light intensity in the area of northern North Island,  New Zealand. 18 persons reported feeling this earthquake with 16 of light intensity; and 2 with light shaking in North Island, New Zealand.

 

O:  4JUN2019 02:21:28  37.9S  176.6E mb=4.3  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 29MAY2019 116339    38.0S  177.0E 3.0-4.9 BAAAA  North Island, N.Z.         

 

O: 04JUN2019 00:31:25 36.8S 178.2E ML=4.3  GEONET Felt with light intensity

 

GEONET reported this earthquake was felt with light intensity in the area of northern North Island,  New Zealand. 22 persons reported feeling this earthquake with 14 of light intensity; and 6 with light shaking in North Island, New Zealand.

 

O: 04JUN2019 05:53:52 39.0S 178.6E ML=4.4  GEONET Felt with moderate intensity

 

GEONET reported this earthquke was felt with moderate intensity in the area of northern North Island,  New Zealand. 119 people reported feeling this earthquake with 68 with weak intensity, 45 with light intensity and 4 with moderate intensity and 2 with extreme intensity in North Island, New Zealand.

 

An unusual earthquake of M 4.6 also occurred in the Arctic Ocean north of  Svalbard today. This is the strongest earthquake in this area within about  500 km of this epicenter in more than a year - since an M 5.2 on May 30, 2018. This epicenter is located at 103 degrees from the M 7.5 in New Britain  of May 14 and was likely promoted from that source.

 

O:  3JUN2019 17:55:43  80.7N    3.6W mb=4.6  EMSC   NORTH OF SVALBARD            

 

STRONG EARTHQUAKES IN SUMATRA ANTIPODAL TO NORTHERN SOUTH AMERICA

 

EARTHQUAKE SUMMARY FOR JUNE 2, 2019

 

The strongest earthquakes in the world today were a pair of M 5.5-5.8 events in the Nias, Indonesia region. They were reported by NEIC to have been felt with intensity II-III in Sumatra at Gunung Stoli and Sibolga.  As this activity occurred within about 30 minutes of local solar noon at the time

of the new moon, it is likely it was enhanced by tidal effects which maximized at this hour. The tidal forecast for this new moon reads:

 

"The New moon will arrive at 10:02 UT on June 3. Longitudes which are sub-solar at this time are near 30 East and those antisolar at 150 West. Regions in these Alaska and the western North America and Hawaii areas as well as portions of the East Pacific Rise in the West and the East African

Rift and eastern Europe in the east. These areas are most likely to see significant tidal triggering in the next week, but other areas may also see tidal triggering which should be most prominent near local solar noon and midnight." (June 1-2, 2019)

 

At the time of the M 7.5 in Ecuador on February 22, this summary suggested first that it could trigger antipodal activity in Sumatra as:

 

"A pair of moderate earthquakes in  northern Sumatra occurred several hours after the mainshock in Ecuador. These are located near the antipode of that event and may have been promoted by concentrated antipodal energy from Ecuador. The true antipode is at 2N 103E, north and east of the active seismic regions in Sumatra. But some triggering is likely in Sumatra in coming days." (February 22, 2019)

 

More recently this antipodal situation had been noted in this summary following the M 8.0 on May 26 as:

 

"The antipode of today's Peruvian quake is located at 6N 105E west of Sumatra, Indonesia. There had been some indication over the past several days of unusual activity in this area but this had not been confirmed. This area is generall quiet in a seismic sense. No earthquakes of M>=7.9 have previously been located in north-central Peru within about 300 km of today's epicenter." (May 26, 2019)

 

The last earthquake in the Nias region of Sumatra within about 200 km of today's epicenter of M>=5.8 was an M 5.8 on November 29, 2018 and prior to that an M 5.8 on September 1, 2016. Forecasts 116118 had expected today's activity within about 50 km of the epicenter

was likely around May 27 to June 1.

 

O:  3JUN2019 06:04:35   0.3N   97.7E mb=5.5  EMSC   NIAS REGION, INDONESIA       

O:  3JUN2019 05:57:09   0.4N   97.8E Mw=5.8  EMSC   NIAS REGION, INDONESIA       

P:  1JUN2019 116367     0.0N   98.0E 4.0-5.5 AAAAA  So. Sumatera               

P: 27MAY2019 116118     1.0N   98.0E 4.0-5.4 CAAAA  So. Sumatera               

 

The swarm of light earthquakes in eastern Los Angeles, California also continued today. The largest in the current swarm "(M 3.0-3.3) occurred today. This

is an area at the seventh node from the M 7.5 in Ecuador of February 22 and could still see a larger event. NEIC reported today's larger events were felt

with intensity II-III in California at Fontana, Mira Loma, Riverside, Rancho Cucamonga, Ontario, and other areas in eastern Los Angeles. The largest was an M 3.3 which was felt with maximum intensity IV in Fontana, California.

 

An earthquake of M 3.1 also occurred about 50 km southeast of the Los Angeles swarm today. NEIC reported it was felt with intensity II-III in the California ares of Nuevo, Moreno Valley, Perris, San Jacinto, Homeland, Beaumont, and Hemet among other communities within about 50 km of the epicenter.

This may be a far-field effect of the M 7.5 in Ecuador of February 22 and had been expected at that time in this summary as:

 

"Earthquakes of this size in Ecuador can help promote seismicity in California several months later. This summary will follow this in future issues." (February 22, 2019)

 

O: 02JUN2019 13:24:23  34.1N  117.5W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 03JUN2019 05:40:54  34.1N  117.5W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 03JUN2019 00:38:53  34.1N  117.5W Ml=2.1  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 03JUN2019 06:39:51  34.1N  117.5W Ml=2.1  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 02JUN2019 22:10:51  34.1N  117.5W Ml=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 03JUN2019 05:29:22  34.1N  117.5W Ml=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 03JUN2019 05:16:31  34.1N  117.5W Ml=2.3  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 03JUN2019 00:08:39  34.1N  117.5W Ml=2.6  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 03JUN2019 00:14:04  34.1N  117.5W Ml=2.7  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 02JUN2019 23:36:36  34.1N  117.5W Ml=3.3  EMSC   GREATER LOS ANGELES AREA, CALIF.

O:  2JUN2019 13:21:29  34.0N  117.5W Ml=2.3  EMSC   GREATER LOS ANGELES AREA, CALI

P:  5JUN2019 116469    34.1N  117.5W 2.5-4.4 BAAAA  So. California             

P: 31MAY2019 116215    34.2N  117.8W 2.5-4.4 AAAAA  So. California             

 

O:  2JUN2019 20:04:55  33.8N  117.1W ML=3.4  EMSC   SOUTHERN CALIFORNIA          

O:  2JUN2019 20:01:55  33.8N  117.1W Ml=2.7  EMSC   SOUTHERN CALIFORNIA          

P: 27MAY2019 116215    34.3N  117.5W 2.5-4.4 BAAAA  So. California             

 

 

A moderate earthquake of M 4.5 in Turkey occurred east of Istanbul today. NEIC reported maximum intensity IV in

Turkey at Akyaszi, Sakarya and II-III in Adapazari, Bilecik, Gebze, Istanjbul, Buyukcekmece, Tavsabnli and Kirac, Turkey.

This is the strongest earthquake within about 200 kkmk of this epicenter in  Western Turkey since an M 5.0 more than five years ago on November 24, 2013

and prior to that an M 4.9 on June 19, 2012. Forecast 116260 had expected this event in this area was likely around May 31 about 150 km to the west

of today's epicenter. It continues activation of the North Anatolian Fault zone which has been detailed in this summary over the past week. This began

after the M 8.0 in Peru of May 26. Today's epicenter, at 105 degrees from the Peru event, was probably promoted by energy from that source.

 

O:  2JUN2019 13:08:47  40.7N   30.8E mb=4.6  EMSC   WESTERN TURKEY               

P: 31MAY2019 116260    41.0N   29.0E 3.0-5.1 AABAA  Romania/NW Turkey          

 

Anothern area near 103 degrees from the M 8.0 in Peru is the region from New Zealand north to Tonga. This area was also active today. An M 4.6 north of North Island was the strongest within about 150 km of this epicenter since an M 5.0 on April 27, 2019.  Forecast 116598 had expected this event within about 25 km was likely around June 4. An M 5.9 also occurred in Tonga today north of New Zealand. This is the largest event within about 200 km of this epicenter since an M 6.2 on January 26, 2019 and an M 6.4 on December 23, 2018. These events are located near 100 degrees from Peru and were probably promoted from that source.

 

NEIC reported the earthquake of M 4.6 off the east coast of North Island, New Zealand  was felt with intensity II-III in the area(s) of Ruatoria, Gisborne and Auckland, New Zealand.

 

O:  3JUN2019 03:08:29  36.7S  178.0E mb=4.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  4JUN2019 116598    37.0S  178.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

O:  3JUN2019 01:02:19  20.7S  173.5W mb=4.7  EMSC   TONGA                        

O:  2JUN2019 15:43:15  21.1S  174.2W mb=4.9  EMSC   TONGA                        

O:  2JUN2019 10:36:29  21.3S  173.9W Mw=5.9  EMSC   TONGA                        

P:  2JUN2019 116591    21.0S  177.0W 4.0-5.7 AACAA  Tonga Islands              

P:  4JUN2019 116579    19.0S  173.0W 4.0-5.9 ACAAA  Tonga Islands              

 

The strongest earthquake in the U.S. or Canada was an M 3.8 in Northern Alaska in an aftershock zone that has been relatively quiet in recent days. The last earthquake within this aftershock zone of M>=3.8 occurred as an M 3.8 on March 20, 2019. The last of larger magnitude was an M 4.2 on March 13, 2019. These are aftershocks of the M 6.3 of August 12, 2018. Forecasts 116296 and 116556 had expected today's event at the end of May or in early June.

 

O:  2JUN2019 23:14:32  69.6N  144.6W ML=3.0  EMSC   NORTHERN ALASKA              

O:  2JUN2019 23:08:51  69.6N  144.7W mb=3.8  EMSC   NORTHERN ALASKA              

P:  5JUN2019 116556    69.2N  144.8W 3.0-4.8 BAAAA  Northern Alaska            

P: 27MAY2019 116296    69.0N  144.0W 3.0-4.8 CAAAA  Northern Alaska            

 

ATLANTIC OCEAN RIDGE ACTIVE

 

EARTHQUAKE SUMMARY FOR JUNE 1, 2019

 

The strongest seismicity in the world today occurred in the Central and Southern Mid-Atlantic Ridge where events of M 5.3, 5.4 and 4.7 were recorded. None of these were felt. The event in  Central Mid-Atlantic Ridge of M 5.3 is within about 300 km of the exact antipode of the M 7.5 in New Britain of May 14 and was probably promoted by focused energy from that event. Forecasts  116110, 116313 and 116349 had expected this activity was likely at the end of May.

 

O:  1JUN2019 15:03:01   0.7N   25.9W Mw=5.3  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 25MAY2019 116110     1.0N   28.0W 4.0-5.4 CABAA  Central Mid-Atlantic Ridg  

 

O:  1JUN2019 10:17:44  14.1S   14.5W Mw=5.4  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P: 23MAY2019 116313    13.0S   15.0W 4.0-5.4 CBAAA  So. Mid-Atlantic Ridge     

 

O:  2JUN2019 01:07:19  47.0S   10.6W mb=4.7  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P: 24MAY2019 116349    44.0S   16.0W 4.0-5.6 CCCAA  So. Mid-Atlantic Ridge      

 

An earthquake of M 5.3 also occurred in the Nias region of Sumatra, Indonesia today. NEIC reported this earthquake of M 5.3 in Nias, Indonesia was felt with intensity II-III in the area(s) of Gunung Stoli and Sibolga, Sumatra, Indonesia.  This continues increased seismicity in the region which began shortly after the M 8.0 in Peru of May 26. It is located near the antipode of that event and may have been promoted by focused energy at the antipode. It is also near the antipode of the M 7.5 in Ecuador of February 22. Forecast 116118 had expected this activity within about 50 km of the epicenters around the end of May.

 

O:  2JUN2019 01:07:07   0.2N   97.9E ML=4.6  EMSC   NIAS REGION, INDONESIA       

O:  2JUN2019 03:03:10   0.7N   98.5E Mw=5.3  EMSC   NIAS REGION, INDONESIA       

P: 27MAY2019 116118     1.0N   98.0E 4.0-5.4 BAAAA  So. Sumatera               

 

A strong eruption of Mt. Etna is occurring. This has been joined by a series of light earthquakes. The eruption included strong lave flows and ash venting. Forecast 116196 had expected this activity in Sicily was likely around May 31.

 

O: 01JUN2019 10:52:14  38.1N   15.2E ML=2.1  EMSC   SICILY, ITALY

O: 01JUN2019 08:30:36  38.1N   15.2E ML=2.3  EMSC   SICILY, ITALY

O:  1JUN2019 09:14:19  38.5N   16.2E ML=3.4  EMSC   SOUTHERN ITALY               

P: 31MAY2019 116196    38.0N   15.0E 3.0-4.4 AAAAA  Mediterranean/Sicily       

 

The series of earthquakes in Albania continued today with events of M 4.8-5.0. NEIC reported this earthquake of M 5.0 in Albania was felt with intensity IV in Elbasan, Albania and II-III in the area(s) of Gostivar, Macedonia.  This began yesterday and was discussed in this summary at the time as:

 

"A moderate M 5.2 in Albania today was widely felt and followed by a strong aftershock series and at least one moderate foreshock. The mainshock was reported felt with maximum intensity in Albania with intensity V in Korce and III in Berat and  Tirana. Intensity II-III was reported from Greece at Florina, Grevena, Ioannina, and in Macedonia at Skopje, Kicevo, Bitola, Ohrid. The last earthquake in Albania within about 150 km of this activity with M>=5.2 was and M 6.6 on October 15, 2016 and prior to that an M 5.5 on September 6, 2009. Forecasts 116259 and 116200 had expected this activity was likely within about 50 km of today's epicenter at the end of May. It is likely related to the M 8.0 in Peru as it occurred at a distance from that event consistent with strong triggering (98 degrees). This appears to be part of the activation of the North Anatolizn Fault Zone which runs through Turkey, Greece and Albania" (June 1, 2019)

 

O: 01JUN2019 18:30:13  40.4N   20.7E mb=4.3  EMSC   ALBANIA

O: 01JUN2019 09:11:40  40.5N   20.8E mb=4.2  EMSC   ALBANIA

O: 01JUN2019 15:19:25  40.5N   20.8E mb=4.4  EMSC   ALBANIA

O: 01JUN2019 18:50:15  40.5N   20.8E mb=4.4  EMSC   ALBANIA

O: 01JUN2019 07:00:28  40.5N   20.8E mb=4.8  EMSC   ALBANIA

O:  1JUN2019 12:47:14  40.5N   20.9E ML=3.8  EMSC   ALBANIA                      

O: 01JUN2019 07:00:28  40.5N   20.9E mw=5.0  ANSS   SSE of Korce Albania

P: 28MAY2019 116200    39.0N   20.0E 3.0-4.8 BBAAA  No. Greece                 

 

The swarm of light earthquakes in eastern Los Angeles, California continued today. NEIC reported this earthquake of M 3.1 in Los Angeles, California was felt with intensity IV in Fontana and II-III in the area(s) of Mira Loma, Riverside, Rancho Cucamonga, and Bloomington, California among others.  The largest was the M 3.1 but a number of smaller events in the area were also recorded. This is the largest to date in the current swarm. In the previous issue of this summary it had been noted as:

 

"A series of light earthquakes in eastern Los Angeles over the past several days may indicate an area of weakness waiting for a larger event. These earthquakes, are being felt with intensity IV in Fontana and Loma Linda and II-III within about 35 km of the epicenter at Mira Loma, Bloomington, Gardena, Fontana, Riverside, Ontario, Rancho Cucamonga and San Bernardino, California, among others. This set began shortly after the M 8.0 in Peru of May 26 and may have been promoted from that source, located near the seventh node (52 degrees) from Los Angeles. The orientation with Peru or New Britain is not conducive for this to expand much further at thie time, however. Earthquakes of M>=2.9 within about 75 km of today's activity occurred on April 11 (M 3.4) and April 3 (M 3.6). Forecast 116215 had expected this activity was likely at the end of May within about 25 km of the epicenters. " (June 1, 2019)

 

 

O: 01JUN2019 12:58:35  34.1N  117.5W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 02JUN2019 05:31:07  34.1N  117.5W Ml=2.1  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 02JUN2019 01:41:39  34.1N  117.5W Ml=2.6  EMSC   GREATER LOS ANGELES AREA, CALIF.

O:  2JUN2019 02:19:48  34.1N  117.5W ML=3.1  EMSC   GREATER LOS ANGELES AREA, CALI

P: 27MAY2019 116215    34.3N  117.5W 2.5-4.4 BAAAA  So. California             

 

A light swarm also appears to have begun in the Virgin Islands region. The largest of today's events in this area was M 4.1. With the coming new moon this could increase and be enhanced in the next several days. This activity is at 142 degrees from the M 7.5 in New Britain of May 14 and was probably promoted by energy from that source. Forecast 116153 expected this activity was likely around May 31. The tidal forecast for the new moon reads:

 

"The New moon will arrive at 10:02 UT on June 3. Longitudes which are sub-solar at this time are near 30 East and those antisolar at 150 West. Regions in these longitude bands include much of the western Pacific subduction zone from Kamchatka to Japan and the New Guinea/New Britain area in the western Pacific and the East African Rift and eastern Europe in the West. These areas are most likely to see significant tidal triggering in the next week, but other areas may also see tidal triggering which should be most prominent near local solar noon and midnight." (June 1, 2019)

 

O:  1JUN2019 10:33:36  19.2N   64.9W mb=4.1  EMSC   VIRGIN ISLANDS REGION        

O:  1JUN2019 10:53:31  19.4N   64.8W Md=3.4  EMSC   VIRGIN ISLANDS REGION        

P: 31MAY2019 116153    18.0N   65.0W 3.0-5.4 ABAAA  Leeward Islands            

 

MODERATELY LARGE EARTHQUAKE ROCKS JALISCO, MEXICO

 

EARTHQUAKE SUMMARY FOR MAY 31, 2019

 

A moderately strong M 5.8 shook regions of coastal Jalisco State, Mexico today. NEIC reported intensity II in Tlanepantla, Mexico. This is the largest event in a series which this summary has followed for over a week in Jalisco. This series lies at 101-103 degrees from the M 7.5 in New Britain of May 14 and is thought to have been promoted from that source as noted in previous issues of this summary:

 

"The most active area in the world today was in western Mexico where events of M 4.7, 4.2 and 4.2 occurred in Jalisco, Mexico. This is the strongest activity in this area since an M 5.6 on November 27, 2018 and an M 5. on November 3, 2017. This epicenter is at 101-102 degrees from the New Britain M 7.5 of May 14, 2019." (May 22-23, 2019)

 

and

 

 

"Far-field triggering from the M 7.5 in New Britain of May 14, 2019 continued unabated today. The strongest earthquakes of the day occurred at 101-102 degrees from that epicenter - an M 5.4 in the area south of Easter Island and a series of events up to M 4.7 in Jalisco, Mexico. Seismic energy is concentrated at this distance  following major events on the earth's surface after reflection and  refraction off the core-mantle boundary returns this energy to this distance zone on the surface. Previous activity at this distance from New Britain in the past week included an M 3.8 in Colorado and an M 5.8 in the Central East Pacific

Rise" (May 23, 24, 2019)

 

Today's M 5.8 is the strongest earthquake in Jalisco, Mexico within about 200 km

of this epicenter since an M 6.6 on January 21, 2016 and prior to that an M 6.2 on February 22,, 2016.  More recent activity has occurred about 200 km to the east in Michoacan in June, 2018 and June 2016. Forecast 116149 had expected today's activity within about 35 km of this epicenter was likely between May 24 and 31. The M 5.8 is located at 101-102 degrees from the epicenter of the M 7.5 in New Britain of May 14 and was likely promoted by concentrated energy from that region. It  is also located at 40 degrees from the M 8.0 in Peru of <ay 26 and may have been enhanced by being at the 9th node from that event.

 

O: 31MAY2019 19:24:02  18.6N  106.2W ML=3.7  EMSC   OFF COAST OF JALISCO, MEXICO

O: 31MAY2019 11:57:25  18.7N  107.2W Mw=5.8  EMSC   OFF COAST OF JALISCO, MEXICO

O: 31MAY2019 15:49:24  19.0N  107.0W ML=4.0  EMSC   OFF COAST OF JALISCO, MEXICO

O: 31MAY2019 16:02:50  19.3N  107.1W ML=4.0  EMSC   OFF COAST OF JALISCO, MEXICO 

P: 24MAY2019 116149    19.0N  107.0W 3.5-5.5 CAAAA  Coast of Jalisco, Mexico   

P: 31MAY2019 116149    19.0N  109.0W 3.5-5.2 AABAA  Coast of Jalisco, Mexico   

 

An M 5.5 in New Britain about 150 km west of the epicenter of May 14 followed the Jalisco event today. This is at 103 degrees from Jalisco and may be part  of the "seismic ping-pong" between these two areas. It is not a classical aftershock of the May 14 event but was probably related. An event of M>=5.5  within 150 km of today's epicenter last occurred as an M 6.1 on March 30, 2019 and an M 5.7 on December 21, 2018. Forecast 116130 had expected this quake within about 100 km was likely around May 27. 

 

O: 31MAY2019 17:50:30   4.9S  151.4E Mw=5.5  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 27MAY2019 116130     4.0S  151.0E 4.0-5.4 BAAAA  New Ireland                

 

The strongest earthquake in the world today was an M 6.1-6.2 in Southern Mindanao, Philippines. NEIC reported maximum shaking of intensity IV in Southern Mindanao at Davao, Buayan, Ula, Canocotan, Mawaband General Santos City and II-III within about 200 km of the epicenter in Southern Mindanao at Polomolok, Tupi, Samal and Bato, Philippines. PHIVOLCS reported it was felt with intensity V in Governor Generoso, Davao Oriental, Mati City; IV in Davao City, General Santos City, Alaberl, Glan, Kiamba and  Malungon, Sarangani; III in Sta. Cruz, Davao del Sur, Tupi, South Cotabato, Koronadal City, Maitum, Sarangani; II in Bislig City, Kadingilan, and Kibawe, Bukidnon, Makilala, North Cotabato, Tacurong City and I in Damulog Bukidnon, Cagayan de Oro City, Philippines. This epicenter is in the antipodal area of the M 8.0 in Peru of May 26 and may have been enhanced by focused energy from that event. The last earthquake within Mindanao within about 150 km of this epicenter with M>=6.2 was an M 7.0 on December 29, 2018 and prior to that an M 6.9 on April 28, 2017, both 50-100 km south of today's epicenter. Forecast 116111 had expected today's event withini this area was likely around May 31.

 

O: 31MAY2019 10:12:31   6.3N  126.5E Mw=6.1  EMSC   MINDANAO, PHILIPPINES        

O: 31MAY2019 10:12:29  06.1N  126.7E MS=6.2  PHI  Felt with intensity V

P: 31MAY2019 116111     7.0N  126.0E 4.0-5.4 AAAAA  Central Philippines        

 

A moderate M 5.2 in Albania today was widely felt and followed by a strong aftershock series and at least one moderate foreshock. The mainshock was reported felt with maximum intensity in Albania with intensity V in Korce and III in Berat and  Tirana. Intensity II-III was reported from Greece at Florina, Grevena, Ioannina, and in Macedonia at Skopje, Kicevo, Bitola, Ohrid.

The last earthquake in Albania within about 150 km of this activity with M>=5.2

was and M 6.6 on October 15, 2016 and prior to that an M 5.5 on September 6, 2009. Forecasts 116259 and 116200 had expected this activity was likely within about 50 km of today's epicenter at the end of May. It is likely related to the M 8.0 in Peru as it occurred at a distance from that event consistent with strong triggering (98 degrees). This appears to be part of the activation of the North Anatolian Fault Zone which runs through Turkey, Greece and Albania as described in the previous issue of this summary:

 

"The activation of the Anatolian Fault zone in Turkey and Greece also continued today with another moderate earthquake of M 4.1 in the Dodecanese Islands  region of Greece and Turkey. This continues enhanced activity over the  past several days in the area." (May 30-31, 2019)

 

The 103 distance from Peru "passes through the epicenter of the M 6.1 in the Andreanof Islands which occurred about a day before Peru; through the Komandorsky Islands of Russia, south to the Tonga-Fiji arc and through New Zealand where a moderate to large earthquake could be promoted in the near term. In the east it passes along the East African Rift north to western Turkey and the Anatolian region." (May 26-27, May 29-30, 2019)

 

 

O: 01JUN2019 04:56:40  40.5N   20.8E ML=3.2  EMSC   ALBANIA

O: 01JUN2019 06:20:50  40.5N   20.8E mb=4.0  EMSC   ALBANIA

O: 01JUN2019 04:51:58  40.5N   20.8E mb=4.4  EMSC   ALBANIA

O: 01JUN2019 04:26:18  40.5N   20.8E mb=4.9  EMSC   ALBANIA

O: 01JUN2019 04:26:18  40.5N   20.8E mb=5.0  ANSS   ALBANIA

O:  1JUN2019 04:33:09  40.5N   20.8E mb=5.2  ANSS   ALBANIA                      

O:  1JUN2019 04:33:09  40.5N   20.8E mb=5.0  EMSC   ALBANIA                      

P: 24MAY2019 116259    40.0N   21.0E 3.0-5.3 ACAAA  Romania/NW Turkey          

P: 28MAY2019 116200    39.0N   20.0E 3.0-4.8 BBAAA  No. Greece                 

 

A series of light earthquakes in eastern Los Angeles over the past several days may indicate an area of weakness waiting for a larger event. These earthquakes, are being felt with intensity IV in Fontana and Loma Linda and II-III within about 35 km of the epicenter at Mira Loma, Bloomington, Gardena, Fontana, Riverside, Ontario, Rancho Cucamonga and San Bernardino, California, among others. This set began shortly after the M 8.0 in Peru of May 26 and may have been promoted from that source, located near the seventh node (52 degrees) from Los Angeles. The orientation with Peru or New Britain is not conducive for this to expand much further at this time, however. Earthquakes of M>=2.9 within about 75 km of today's activity occurred on April 11 (M 3.4) and April 3 (M 3.6). Forecast 116215 had expected this activity was likely at the end of May within about 25 km of the epicenters.

 

O: 31MAY2019 12:31:17  34.0N  117.5W Ml=2.6  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 31MAY2019 13:39:44  34.0N  117.5W Ml=2.9  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 31MAY2019 20:32:01  34.1N  117.5W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 31MAY2019 18:29:04  34.1N  117.5W Ml=2.5  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 31MAY2019 23:45:16  34.1N  117.5W Ml=2.5  EMSC   GREATER LOS ANGELES AREA, CALI

P: 27MAY2019 116215    34.3N  117.5W 2.5-4.4 BAAAA  So. California             

 

An unusual earthquake of M 2.6 was widely felt in upstate New York today. NEIC reported maximum intensity IV in Dickinson Center and North Lawrence with II-III within about 50 km of the epicenter in Nicholville, Brushton, North Bangor, Winthrop, Saint Regis Falls, Malone, Fort Covington and Potsdam, New York among others.  This is the strongest earthquake in this section of New York within about 100 km of this epicenter since an similar M 2.6-2.7 on March 21, 2018 and prior to that an M 3.3 on November 28,, 2015.  Forecast 116249 had expected a light to moderate quake in this region at the end of May.

 

O: 31MAY2019 21:19:52  44.7N   74.6W mb=2.6  EMSC   NEW YORK                      

P: 26MAY2019 116249    45.0N   73.0W 2.0-4.1 BABAA  New England                

 

STRONG FIJI M 6.0 AND UKRAINE EVENT CONSISTENT WITH EXPECTED PATTERN

 

EARTHQUAKE SUMMARY FOR MAY 30, 2019

 

Strong and unusual earthquakes of M 6.0 in Fiji and 4.2 in Ukraine today near 103 degrees from the M 8.0 quake of May 26 in Peru suggested seismic promotion from that source. The strongest earthquake in the world today was an M 5.7-6.0 in the Fiji Islands. NEIC reported it was felt with intensity II-III in Tongatapu, Tonga at Tofoa-Koloua and Nuku'alofa and in Neiafu, Vava'u, Tonga.

This earthquake is located near 100 degrees from the M 8.0 of May 26 in Peru.

The Fiji/Tonga area had been expected to see strong seismic enhancement fromo that source at this time as detailed in previous issues of this report:

 

 

The 103 distance from Peru "passes through the epicenter of the M 6.1 in the Andreanof Islands which occurred about a day before Peru; through the Komandorsky Islands of Russia, south to the Tonga-Fiji arc and through New Zealand where a moderate to large earthquake could be promoted in the near term. In the east it passes along the East African Rift north to western Turkey and the Anatolian region." (May 26-27, May 29-30, 2019)

 

The earthquake in Fiji is the strongest within about 200 km of today's epicenter since an M 6.0-6.1 on February 13, 2010 and an M 6.0 on January 31, 2011. Most activity of this magnitude since then has concentrated about 250 km to the northwest  of today's epicenter. Forecast 116311 had expected today's event was likely around May 29.

 

O: 30MAY2019 15:38:02  21.9S  176.5W Mw=6.0  EMSC   FIJI REGION                  

P: 29MAY2019 116331    22.0S  179.0W 4.0-5.7 AABAA  Tonga Islands              

 

Other areas such as those antipodal to Peru in southern Philippines and Indonesia were also showing signs of enhanced seismicity today.

 

The most unusual earthquake in the world today was an M 4.1 in  Ukraine. It was not reported felt. This is the strongest earthquake in Ukraine within  about 250 km of this epicenter in more than 10 years when an M 4.2 occurred south of this on April 12, 2009. There have been no recorded earthquakes within about 200 km of today's epicenter with M>=4.1 in the past 30 years. It may have been promoted by energy from the M 8.0 in Peru of May 26 as it lies at 107 degrees from that event, near the distance of maximum triggering near 103 degrees. Forecast 116251 had expected this activity in late May.

 

O: 30MAY2019 09:31:26  46.8N   33.9E mb=4.1  EMSC   UKRAINE                      

P: 23MAY2019 116251    41.0N   33.0E 3.5-5.0 CCAAA  No. Turkey/Black Sea        

 

The activation of the Anatolian Fault zone in Turkey and Greece also continued today with another moderate earthquake of M 4.1 in the Dodecanese Islands  region of Greece and Turkey. This continues enhanced activity over the  past several days in the area. Forecast 116226 had expected this activity at the end of May.

 

O: 30MAY2019 21:43:45  37.0N   27.7E mb=4.1  EMSC   DODECANESE IS.-TURKEY BORDER R

P: 24MAY2019 116226    38.0N   29.0E 3.5-5.3 CAAAA  Turkey                     

 

The aftershock sequence of the M 6.6 off the coast of El Salvador reported on in the previous issue of this summary was energetic with at least nine moderate aftershocks of M 4-5 in the first half day. Forecast 116150 had expected this activity to thw west was likely around May 30. The strongest aftershocks of M 4.5 and 4.7 were widely felt in El Salvador. NEIC reported these earthquake off El Salvador  were felt with intensity VI in Juayua Sonsonate, El Salvador and II-III in the area(s) of Santa Catarina, Guatemala.

 

O: 30MAY2019 11:07:02  13.1N   89.4W ML=4.5  EMSC   OFFSHORE EL SALVADOR

O: 31MAY2019 05:46:04  13.1N   89.4W ML=4.5  EMSC   OFFSHORE EL SALVADOR

O: 30MAY2019 10:21:19  13.1N   89.4W ML=4.7  EMSC   OFFSHORE EL SALVADOR

O: 30MAY2019 22:36:18  13.1N   89.4W mb=4.3  EMSC   OFFSHORE EL SALVADOR

O: 30MAY2019 11:52:11  13.1N   89.5W ML=4.1  EMSC   OFFSHORE EL SALVADOR

O: 30MAY2019 17:46:08  13.1N   89.5W ML=4.3  EMSC   OFFSHORE EL SALVADOR

O: 30MAY2019 09:03:31  13.3N   89.2W Mw=6.6  EMSC   OFFSHORE EL SALVADOR          

P: 30MAY2019 116150    13.0N   91.0W 3.5-5.2 AABAA  Guatemala                  

 

 

STRONG EARTHQUAKE SHAKES EL SALVADOR

 

EARTHQUAKE SUMMARY FOR MAY 29, 2019

 

A strong M 6.6 earthquake occurred off the coast of El Salvador today. It was widely felt in El Salvador with maximum intensity VI in Zaragoza, Antiguo Cuscatlan and San Salvador; V in Nueva San Salvador, San Marcos, Santiago, Nuevo Ciscatlan, Rosario de Mora, and IV in Santo Tomas and La Libertad, El Salvador.

A tsunami warning was issued but the quake is probably too small to trigger a strong tsunami. Power was cut to some areas and a tsunami of several cm was expected. No major damage was reported but residents were frightened and some panicked following this event which occurred late at night.

 

This epicenter is located at the third node (120 degrees) from the M 7.5 in New Britain of May 14 and was probably promoted by energy from that event. It is also at 24 degrees (node 26) from the M 8.0 in Peru. This is a distance at which a energy cusp (S, PcP) occurs and strong regional triggering can occur and this event was probably enhanced by energy from Peru which occurred May 26 with M 8.0. This distance relation had most recently noted in this summary on May 20 when strong quakes in the Loyalty Islands followed the M 7.5 in New Britain as:

 

"This activity in the Loyalty Islands is located at 24 degrees from the M 7.5 in New Britain (node 15). This is an active node and the activity in the Loyalty Islands may have been promoted by energy from New Britain." (May 20, 2019)

 

The earthquake was probably also promoted by a strong ocean storm which has stalled near this epicenter over the past several days. This is the only such storm currently active in the world at this time. This summary had noted that this could help promote regional seismicity in the past several issues as:

 

"A low pressure system over southern Nicaragua has been given a 10% chance of becoming a tropical cyclone in the next 48 hours. Low pressures could encourage enhanced seismicity in the area during this storm." (May 26-29, 2019)

 

The last earthquake of M>=6.6 within about 200 km of this epicenter near El Salvador occurred as an M 7.3 on October 14, 2014 and prior to that an M 7.4 on August 27, 2012. Forecast 116150 had expected a moderate earthquake in the region was likely around May 30.

 

O: 30MAY2019 03:21:13  12.6N   88.2W ML=3.8  EMSC   OFFSHORE EL SALVADOR         

O: 29MAY2019 14:07:25  13.1N   89.3W ML=4.1  EMSC   OFFSHORE EL SALVADOR         

O: 30MAY2019 09:03:31  13.3N   89.2W Mw=6.6  EMSC   OFFSHORE EL SALVADOR         

P: 30MAY2019 116150    13.0N   91.0W 3.5-5.2 AABAA  Guatemala                  

 

An unusual M 5.3 also occurred today in Northern Territory, Australia. NEIC reported it was felt with maximum intensity IV in Alice Springs, Northern Territory, Australia about 300 km from the epicenter. This is the first earthquake within about 300 km of this epicenter with M>=5.3 in at least 30 years. The epicenter is located at 142 degrees from the M 8.0 in Peru of May 26. This is a distance at which seismic energy refracted and reflected from core boundaries returns in concentrated form to the surface as well as being the fifth node (72*2 degrees). This can help promote seismicity at this distance, as appears to have occurred in this case. This possibility had been noted in this summary on May 28 as:

 

"Other triggering (from Peru) could occur at the 144 degree distance in Indonesia and southern Japan and at various nodes." (May 26-27, 2019)

 

O: 30MAY2019 07:38:54  21.3S  132.0E mb=4.4  EMSC   NORTHERN TERRITORY, AUSTRALIA

O: 30MAY2019 02:26:51  21.4S  132.0E mb=5.3  EMSC   NORTHERN TERRITORY, AUSTRALIA

 

The earthquake in Northern Territory, Australia was accompanied by a series of three moderate earthquake in New Zealand - in the Kermadec Islands of M 5.0 and in North Island of 4.2 and 4.4-4.5.  GEONET reported the M 4.4-4.5 was felt with weak intensity in the area of northern North Island,  New Zealand. 17 people reported feeling this earthquake with 15 of weak intensity and 2 with light intensity; 0 with moderate intensity; 0 strong shaking; 0 with severe and none with extreme intensity in North Island, New Zealand. The last earthquake within about 100 km of this epicenter in North Island with M>=4.5 was an M 4.5 on Apeil 22, 2019. The last of significantly larger magnitude as an M 6.1 on October 30, 2018. Forecast 116340 had expected this earthquake was likely around May 29 within about 0 km of the observed epicenter. This activity is at 101-120 degrees from the  8.0 in Peru of May 26 and was probably promoted by concentrated seismic energy rom that event, as expected in previous issues of this summary:

 

The 103 distance from Peru "passes through the epicenter of the M 6.1 n the Andreanof Islands which occurred about a day before Peru; through the Komandorsky Islands of Russia, south to the Tonga-Fiji arc and through New Zealand where a moderate to large earthquake could be promoted in the near term. In the east it passes along the East African Rift north to western Turkey and the Anatolian region." (May 26-27, 2019)

 

The earthquake in the Kermadec Islands had been anticipated in forecast 116343 within about 50 km of that epicenter.

 

O: 29MAY2019 18:21:48  31.7S  178.7W mb=5.0  EMSC   KERMADEC ISLANDS REGION      

P: 29MAY2019 116343    32.0S  178.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

 

O: 29MAY2019 15:02:42  38.3S  176.1E ML=4.2  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 29MAY2019 116339    38.0S  177.0E 3.0-4.9 AAAAA  North Island, N.Z.         

 

O: 29MAY2019 16:38:42  38.6S  175.8E mb=4.4  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 29MAY2019 16:38:44  38.5S  175.8E ML=4.5  GEONET Felt with weak intensity

P: 29MAY2019 116340    39.0S  176.0E 3.0-4.9 AAAAA  North Island, N.Z.         

 

The strongest activity in the U.S. or Canada today was a series in the Gulf of Alaska which included an M 4.2, 3.6 and 3.5. It was not reported felt in the area. This is the largest earthquake in the aftershock zone of the M 7.9 which occurrred January 23, 2018 since an M 4.9 April 8, 2019. Forecast 116297 expected today's event was likely around May 28.

 

O: 29MAY2019 21:33:15  56.1N  149.6W ml=3.6  EMSC   GULF OF ALASKA               

O: 29MAY2019 16:22:51  56.5N  148.8W mb=4.2  EMSC   GULF OF ALASKA               

O: 29MAY2019 10:58:01  56.6N  148.7W ml=3.5  EMSC   GULF OF ALASKA               

P: 28MAY2019 116297    55.0N  150.0W 3.0-4.8 ABAAA  Gulf of  Alaska            

 

UNUDUAL QUAKE ON FRENCH-SWISS BORDER AT FOURTH NODE FROM PERU

 

EARTHQUAKE SUMMARY FOR MAY 28, 2019

 

An M 4.2 was widely felt in the French Alps today. It was widely felt in the area. EMSC reported this quake was felt with moderate intensity in Saint-Fingolph, Vouvry, Noville, La Tour-de-Peilz, Vevey, Corsier-sur-Vevy, Lutry, Troistorrents, Aigle,   Switzerland and in France at Evian-les-Bains, Bernex, Maxilly-sur-Leman,  and in general within about 50 km of the epicenter. The last earthquake of M>=4.2 within about 150 km of this epicenter was an M 4.4 on October 24, 2016 and prior to that an M 4.6 on September 8, 2005. Forecast 116237 had expected this area would be active around May 25. This epicenter is located at the fourth node 90 degrees) from the M 8.0 of May 26 in Peru. Readers will recall tha the M 5.8 two days ago in the Kodiak area of Alaska was also at this node. The fourth node can see extensive triggering and this may the case in the current circumstances. The Alaskan event had been noted in the previous issue of this summary as:

 

"This epicenter (in Kodiak, Alaska) is located at the fourth node (90 degrees) from the M 8.0  in Peru of May 26. This was a region where seismic enhancement from that events was considered likely as noted in the previous issue of this summary:

 

"Other triggering could occur at the 144 degree distance in Indonesia and southern Japan and at various nodes. For example, Southern Alaska is at the fourth node (90 degrees) from the Peru epicenter. Central California is at the sixth node from Peru (60 degrees) but fault orientation is not favorable for strong triggering in this area either. These are all areas where moderate quakes could be enhanced to large events by concentrated seismic energy from Peru. This type of triggering can take a while to develop. Area very near rupture can go with the first series of waves, but other areas may take repeated waves to weaken to rupture." (May 26-27, 2019, May 28, 2019)

 

O: 28MAY2019 08:48:05  46.4N    6.8E mb=4.2  EMSC   FRANCE                        

P: 25MAY2019 116237    44.0N    7.0E 3.0-5.3 BCAAA  Italy                      

 

The most unusual earthquake in the U.S. or Canada today was an M 2.7 in central Colorado. NEIC reported it was felt with intensity II-III in Colorado at Eagle, Edwards, Gypsum, Bond, Carbondale, Hotchkiss, Arvada and Sedalia. Earthquakes in this area generally occur about 50 km to the west with the last such event an M 3.1 on February 1, 2019. The last event of M>=2.7 within about 50 km of today's epicenter occurred as an M 3.4 on August 21, 2012. Forecast 116191 and 116234 had expected this activity at the end of May.

 

O: 28MAY2019 13:31:33  39.6N  106.9W ML=2.7  EMSC   COLORADO                     

P: 24MAY2019 116191    38.8N  107.4W 2.0-4.0 BBAAA  Colorado area              

P: 29MAY2019 116234    40.6N  106.6W 2.0-4.1 AAAAA  Colorado area              

 

A strong series of light earthquakes hit the region of Central California near Coso Junction today.  This activity is near the sixth node (60 degrees) from the great quake in Peru and was likely promoted by energy from that event. Forecast 116180 had expected today's activity around May 27.

 

O: 29MAY2019 02:45:16  35.4N  118.7W Ml=2.0  EMSC   CENTRAL CALIFORNIA

O: 28MAY2019 15:55:27  36.2N  118.2W Ml=2.0  EMSC   CENTRAL CALIFORNIA

O: 29MAY2019 01:30:59  36.2N  118.2W Ml=2.0  EMSC   CENTRAL CALIFORNIA

O: 28MAY2019 17:04:20  36.2N  118.2W Ml=2.3  EMSC   CENTRAL CALIFORNIA

O: 28MAY2019 21:32:43  36.2N  118.2W Ml=2.5  EMSC   CENTRAL CALIFORNIA

O: 28MAY2019 19:54:22  36.2N  118.2W Ml=2.6  EMSC   CENTRAL CALIFORNIA

O: 29MAY2019 05:19:11  36.2N  118.2W Ml=2.6  EMSC   CENTRAL CALIFORNIA

O: 28MAY2019 16:23:16  36.2N  118.2W ml=2.1  EMSC   CENTRAL CALIFORNIA

P: 27MAY2019 116180    36.3N  118.1W 2.5-4.4 AAAAA  California/Nevada area     

 

 

An unusual earthquake also occurred today as an M 3.2 in the Drake Passage south of South America. It was not reported felt in this remote area. This epicenter is located at the 7th node (51 degrees) from the M 8.0 of May 26 in Peru and may have been promoted by energy from that source.

 

O: 28MAY2019 12:00:30  56.3S   68.6W ML=3.2  EMSC   DRAKE PASSAGE                

 

MODERATELY LARGE QUAKE SHAKES KODIAK, ALASKA

 

EARTHQUAKE SUMMARY FOR MAY 27, 2019

 

The strongest earthquake in the world today was an M 5.8 in the Kodiak Island region of Southern Alaska. NEIC reported intensity IV in Homer and Anchor point and II-III in Ninilchik, Pedro Bay, Kodiak Kenai NTL, Kasilof, Soldotna and Sterling, Alaska among others. This is the strongest earthquake in the Kodiak area within about 150 km of this epicenter since an M 7.1 to the north on January 24, 2016. Forecast 116290 had expected regional seismicity in the area was likely to be enhanced around May 30. It may have been promoted by tidal stresses as it occurred within minutes of local solar midnight, a time when such stresses are maximized. This epicenter is located at the fourth node (90 degrees) from the M 8.0  in Peru of May 26. This was a region where seismic enhancement from that events was considered likely as noted in the previous issue of this summary:

 

"Other triggering could occur at the 144 degree distance in Indonesia and southern Japan and at various nodes. For example, Southern Alaska is at the fourth node (90 degrees) from the Peru epicenter. Central California is at the sixth node from Peru (60 degrees) but fault orientation is not favorable for strong triggering in this area either. These are all areas where moderate quakes could be enhanced to large events by concentrated seismic energy from Peru. This type of triggering can take a while to develop. Area very near rupture can go with the first series of waves, but other areas may take repeated waves to weaken to rupture." (May 26-27, 2019)

 

O: 27MAY2019 09:52:20  59.0N  152.4W Mw=5.7  EMSC   KODIAK ISLAND REGION, ALASKA 

O: 27MAY2019 23:44:49  60.3N  152.5W Mw=4.3  EMSC   SOUTHERN ALASKA              

P: 30MAY2019 116290    61.3N  152.3W 3.2-5.1 BAAAA  Central Alaska             

 

An M 5.5 also occurred today in the Solomon Islands.  NEIC reported it was felt with intensity III in the Solomon Islands at Buala Isabel. The last eartquake within about 200 km of this epicenter with M>=5.5 was an M 5.6 on September 20, 2018. Today's epicenter is near the third node from Peru but not at it and may have been affected by energy from that great earthquake. Forecast 116139 had expected today's event was likely within about 100 km around May 31.

 

O: 27MAY2019 09:25:20   8.3S  158.6E mb=5.5  EMSC   SOLOMON ISLANDS              

P: 31MAY2019 116139     9.0S  158.0E 4.0-5.4 BAAAA  Solomon Islands            

 

A moderately strong M 5.8 also occurred in the South Sandwich Islands today, This is the strongest earthquake in the South Sandwich Islands since an M 6.0 on April 22, 2109 and an M 6.8 on April 5, 2019, the only such events in the region since May, 2016. Forecast 116352 had expected this event was likely around May 27. The epicenter is located near the 6th node (60 degrees) from the Peru epicenter of May 26 and may have been promoted by seismic energy from that event. Seismicity in central California, also at the 6th node from Peru was active today but not notable.

 

O: 27MAY2019 23:29:34  56.4S   27.8W Mw=5.8  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 27MAY2019 116352    58.0S   26.0W 4.0-5.6 ABAAA  So. Sandwich Islands       

 

Among other activity, apparently promoted from the Peru earthquake were events of M 4.7 off South Island, New Zealand and an M 4.5 in the Greecian Dodecanese Islands. The earthquake in New Zealand was not reported felt. It is the largest within about 150 km of this epicenter off South Island since an M 4.5 on August 12, 2018.Most activity in recent years in the area has occurred about 150 km to the north or south of today's epicenter. Forecast 116348 had expected activity in this area was likely around May 27. This epicenter is at 103-104 degrees from the M 8.0 in Peru of May 26, and was probably promoted by concentrated seismic energy from that source.

 

O: 27MAY2019 14:21:44  46.6S  166.0E mb=4.5  EMSC   OFF W. COAST OF S. ISLAND, N.Z

O: 27MAY2019 14:21:44  46.6S  166.0E mb=4.5  ANSS   OFF W. COAST OF S. ISLAND, N.Z

P: 27MAY2019 116348    44.0S  168.0E 3.0-5.1 ACBAA  So. Island, N.Z.           

 

This activity had been anticipated in the previous issue of this summary as:

 

The 103 distance from Peru "passes through the epicenter of the M 6.1

in the Andreanof Islands which occurred abouot a day before Peru; throuogh the Komandorsky Islands of Russia, south to the Tonga-Fiji arc and through New Zealand where a moderate to large earthquake could be promoted in the near term. In the east it passes along the East African Rift north to western Turkey and the Anatolian region." (May 26-27, 2019)

 

The M 4.5-4.6 in the Dodecanese Islands near the Turkish border continued activation of the area of the North Anatolian Fault which began immediately following the earthquake in Peru. Like the earthquake in New Zealand, this event is located at 103-104 degrees fromo the Peru epicenter and was probably promoted by concentrated seismic energy from Peru. The last earthquake of M>=4.5 within  the Dodecanese Islands within about 100 km of today's epicenter was an  M 5.3 on January 24, 2019. Other such events in the past 1.5 years occurred with M 4.8-4.9 on January 22, 2019 and April 10, 2018. Forecast 116226 had expected moderate activity in this area was likely around May 24.

 

O: 28MAY2019 05:27:47  37.0N   27.6E mb=4.5  EMSC   DODECANESE IS.-TURKEY BORDER R

O: 28MAY2019 05:27:47  36.9N   27.6E mb=4.6  ANSS   DODECANESE IS.-TURKEY BORDER R

P: 24MAY2019 116226    38.0N   29.0E 3.5-5.3 AAAAA  Turkey                     

 

SEISMIC ENHANCEMENT NEAR 103 DEGREES FROM NORTHERN PERU

 

EARTHQUAKE SUMMARY FOR MAY 26, 2019

 

In recent issues of this summary seismic enchancement of unusual earthquakes near 103 degrees from the M 7.5 in New Britain has been detailed. With the M 8.0

in Northern Peru yesterday, this dynamic is likely to change encouraging promoted seismicity near 103 degrees from that epicenter in the coming days. This distance zone from Peru is not highly seismic. It passes through the epicenter of the M 6.1 in the Andreanof Islands which occurred abouot a day before Peru; through the Komandorsky Islands of Russia, south to the Tonga-Fiji arc and through New Zealand where a moderate to large earthquake could be promoted in the near term. In the east it passes along the East African Rift north to western Turkey and the Anatolian region. Other triggering could occur at the 144 degree distance in Indonesia and southern Japan and at various nodes. For example, Southern Alaska is at the fourth node (90 degrees) from the Peru epicenter. Central California is at the sixth node from Peru (60 degrees) but fault orientation is not favorable for strong triggering in this area either. These are all areas where moderate quakes could be enhanced to large events

by concentrated seismic energy from Peru. This type of triggering can take a while to develop. Area very near rupture can go with the first series of waves, but other areas may take repeated waves to weaken to rupture. For example, the M 7.5 foreshock to the M 8.0 in Peru of 2005 took nearly nine months before rupture at this large magnitude occurred at the antipode of the M 9.3 Sumatra Earthquake of December 26, 2004. A pair of events of M 5.1 and 5.0 did occur near the Sumatra antipode in Peru on January 15, 2005 less than a month later, perhaps presaging the later M 7.5. Although not exact, Sumatra is near the antipode of the M 8.0 in Peru and could see a large triggered event  in the next month as well. Several unusual earthquakes did follow the Peru earthquake at 101-103 degrees distance today. These included an M 4.7 in the Congo and

an M 4.2 in Western Turkey.

 

An unusual earthquake of M 4.7 was felt lightly in the D.R. Congo today. NEIC re;ported intensity IV in Lubumbashi, Katanga and III in Katanga at Kipushi and Kambove and in Solwezi, Northwestern Zambia. This epicenter is located at 102 degrees from the Peru M 8.0 of earlier in the day. It was likely triggered by energy from that event. The last earthquake within aqbout 200 km of this epicenter on the East African Rift with M>=4.7 occurred on June 14, 2012 with M 4.7. The strongest quakes in this area in the past 30 years have maximum magnitude M 4.7-4.8, so today's event is as large as most quakes in the area get.

 

O: 26MAY2019 20:16:21  11.3S   27.0E mb=4.7  EMSC   DEMOCRATIC REPUBLIC OF THE CON

 

A series of light to moderate earthquakes also shook the region of western Turkey today. EMSC reported these were felt with intensity III=IV in Turkey at Yatagan, Milas, Mentese, Bodrum, Didim, Efeler, Kusadasi, Fethiye, Karsiyaka and in general within about 100 km of the epicenters. Because of the east-west orientation of the Anatolian Seismic Zone, this area is unlikely to see major triggering from Peru, but moderate seismic enhance is possible. Today's M 4.2 is the strongest in the area since late January, 2019 when an M 5.3 occurred on January 24 and was followed by two of M 4.2 each. Forecast 116226 had expected today's activity within about 100 km was likely around May 24.

 

O: 27MAY2019 00:23:05  37.1N   27.7E ML=2.3  EMSC   WESTERN TURKEY               

O: 26MAY2019 12:02:16  37.2N   28.0E ML=3.0  EMSC   WESTERN TURKEY               

O: 26MAY2019 12:07:11  37.3N   28.0E ML=4.2  EMSC   WESTERN TURKEY               

O: 26MAY2019 12:00:21  37.3N   28.1E ML=3.3  EMSC   WESTERN TURKEY               

P: 24MAY2019 116226    38.0N   29.0E 3.5-5.3 AAAAA  Turkey                     

 

GREAT QUAKE SHAKES NORTH-CENTRAL PERU

 

EARTHQUAKE SUMMARY FOR MAY 25, 2019

 

The strongest earthquake in the world since an M 8.2 in the Fiji Islands on August 19, 2018 - a great quake of M 8.0 shook areas of north-central Peru today. NEIC reported it was felt with intensity IX (damage) in Peru at Yurimaguas, Loreto; VIII in Requena; IV in Tarapoto,Saquena,; V in Chachaoyas, Pucallpa, Iquitos and IV in Cajabamba and Cajamarca, Peru and in Cruzeiro do Sol, Acre, Brazil. Initial reports and data on the internet indicate this earthquake was damaging in the area of Yurimaguas, a town of more than 60,000 where there was considerable damage and where many buildings collapsed. This is in the Amazon area of Peru, an area of sparse population. Damage was also mitigated by the intermediate depth (100 km) of this event. This is the first shallow or intermediate quake in the world of this size,  howver since an M 8.1 on September 8, 2017 in Chiapas/Oaxaca, Mexico

 

The M 8.0 was preceded earlier in the day by an M 4.7 upslope in the Peru subduction zone. That event was felt with intensity II-III in Peru at Huanchanco and Trujillo, La Libertad and Chimbote, Ancash, Peru.

 

In the preceding issue of this summary it had been noted that a possible outer-rise earthquake had occurred up the subduction zone off the coast of northern Peru.

 

"An unusual earthquake of M 4.4 also occurred west of northern Peru today. While it was not reported felt in the region, This earthquake is the strongest within  about 100 km of this epicenter since several of M 4.4-4.5 on October 10, 2018. It is located on the outer rise of the subduction plate and may be an outer-rise event indicating a strong upcoming earthquake in the region of Northern Peru. This summary discussed outer-rise earthquakes in the previous summary in relation to an M 6.1 in the Andreanof Islands" (May 24-25, 2019)

 

The antipode of today's Peruvian quake is located at 6N 105E west of Sumatra,

Indonesia. There had been some indication over the past several days of unusual activity in this area but this had not been confirmed. This area is generall quiet in a seismic sense. No earthquakes of M>=7.9 have previously been located in north-central Peru within about 300 km of today's epicenter. Forecast 116133 had expected activity within about 50-100 km of this epicenter was likely around May 27.

 

O: 26MAY2019 07:41:12   5.8S   75.2W Mw=8.0  EMSC   NORTHERN PERU                

O: 26MAY2019 07:41:14   5.8S   75.3W mw=8.0  ANSS   SSE of Lagunas Peru

P: 27MAY2019 116133     6.0S   76.0W 4.0-5.5 AAAAA  No. Peru                   

 

O: 25MAY2019 12:56:25   8.6S   79.6W mb=4.7  EMSC   NEAR COAST OF NORTHERN PERU  

P: 27MAY2019 116133     8.0S   78.0W 4.0-5.9 AABAA  No. Peru                   

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 off the coast of Oregon. The last earthquake of M>=4 within about 100 km of this epicenter was an M 4.7 on April 10, 2019 and an M 4.2 on February 12, 2019. The only other such event in the region since November, 2018 was an M4.5 on January 27, 2019. Forecast 116255 had expected today's event was likely within about 50 km of this epicenter at the end of May.

 

O: 25MAY2019 23:53:46  44.1N  129.1W mb=4.0  EMSC   OFF COAST OF OREGON          

P: 29MAY2019 116255    44.5N  129.8W 3.0-4.5 BAAAA  Off Coast of Oregon        

 

ENHANCED SEISMICITY CONTINUES AT 103 DEGREES FROM NEW BRITAIN

 

EARTHQUAKE SUMMARY FOR MAY 24, 2019

 

It was a relative quiet day in global seismicity with the strongest earthquakes

around M 5.0-5.2 in active areas of South America, Tonga and the Kuril Islands. The most unusual earthquake of the day, however was an M 4.5-4.7 in the Caucasus of Russia. It was followed by a M 3.7  aftershock. Both were felt lightly in their epicentral area. EMSC reported it was felt with intensity II-III in the Russian Federation at Makhachkala, Caucasus about 30 km from the epicenter. This epicenter is located at 103-104 degrees from the epicenter of the M 7.5 in New Britain of May 14. This summary has concentrated reports at this distance from

New Britain in recent days as in the previous summary:

 

 

"The most unusual earthquake of the day was an M 4.7 in Madagascar. It was not reported felt in this area.  This is the strongest earthquake within about 200 km of this epicenter inh at least  30 years. Events of M 4.6-4.7 occurred nearby on January 5, 205 and October 30, 2015. This epicenter is located at 103 degrees from the epicenter of the M 7.5 in New Britain of May 14, adding to the increasing number of unusual events at this distance from New Britain in the past week. This had been detailed in the previous issue of this report when unusual quakes hit the South Pacific and Jalisco, Mexico Unusual quakes at this distance also occurred in Colorado (M 3.8 and in the Central Pacific Rise (M 5.9) in the past week. This summary noted in the previous issue:

 

"Far-field triggering from the M 7.5 in New Britain of May 14, 2019 continued unabated today. The strongest earthquakes of the day occurred at 101-102 degrees from that epicenter - an M 5.4 in the area south of Easter Island and a series of events up to M 4.7 in Jalisco, Mexico. Seismic energy is concentrated at this distance  following major events on the earth's surface after reflection and refraction off the core-mantle boundary returns this energy to this distance zone on the surface. Previous activity at this distance from New Britain in the past week included an M 3.8 in Colorado and an M 5.8 in the Central East Pacific Rise" (May 23, 24, 2019)

 

The earthquake in the Caucasus was the strongest in that area within about 200 km since an M 4.8 on May 13. 2016. Forecast 116233 had expected this event was likely towards the end of May.

 

O: 24MAY2019 23:44:04  42.9N   47.1E mb=3.5  EMSC   CAUCASUS REGION, RUSSIA      

O: 24MAY2019 22:34:05  43.1N   47.2E mb=4.5  EMSC   CAUCASUS REGION, RUSSIA      

P: 28MAY2019 116233    43.0N   44.0E 3.5-5.4 BABAA  Caucasus/Caspian Sea       

 

Seismicity at 103 degrees from New Britain also continued in the region of Western Mexico with an M 4.3 in Jalisco and other aftershocks.

 

O: 24MAY2019 09:07:41  18.6N  106.3W ML=3.9  EMSC   OFF COAST OF JALISCO, MEXICO 

O: 24MAY2019 10:47:09  18.6N  106.3W ML=4.3  EMSC   OFF COAST OF JALISCO, MEXICO 

P: 24MAY2019 116149    19.0N  107.0W 3.5-5.5 AAAAA  Coast of Jalisco, Mexico   

P: 28MAY2019 116149    18.0N  106.0W 3.5-5.5 BAAAA  Coast of Jalisco, Mexico   

 

 

The most unusual earthquake in the U.S. or Canada today was an M 3.4 north of Maui, Hawaii. NEIC reported this earthquake of M 3.4 in Maui, Hawaii was felt with intensity II-III in the area(s) of Kaunakakai, Wailuku and Kula, Hawaii.

This is the strongest earthquake within about 100 km of this epicenter in  Hawaii since an M 3.7 on September 15, 2018 and prior to that on June 23, 2018 with M 3.9. Forecast 116169 had expected this activity in the Maui area was likely within  about 100 km of this epicenter around May 29.

 

O: 24MAY2019 13:16:18  21.2N  156.6W Ml=3.4  EMSC   MAUI REGION, HAWAII          

P: 29MAY2019 116169    20.3N  156.6W 4.0-5.6 BAAAA  Hawaii area                

 

An unusual earthquake of M 4.4 also occurred west of northern Peru today. While it was not reported felt in the region, This earthquake is the strongest within about 100 km of this epicenter since several of M 4.4-4.5 on October 10, 2018.

It is located on the outer rise of the subduction plate and may be an outer-rise event indicating a strong upcoming earthquake in the region of Northern Peru. This summary discussed outer-rise earthquakes in the previous summary in relation to an M 6.1 in the Andreanof Islands as:

 

"The earthquake in the Andreanof Islands today was preceded by several outer rise at 178,3 West longitude events in the past year. These included an M 4.7 at 178.3W on August 10, 2018. This summary had noted this as a possible outer rise earthquake at tht time as:

 

"The epicenter is south of the normal activity in the area and may be an outer-bank earthquake suggesting a larger upcoming event at this longitude in the Andreanof Islands, Alaska."  (August 11, 2018, May 24, 2019)

 

Forecast 116133 had expected today's event to the east in northern Peru was

likely around May 27.

 

O: 25MAY2019 01:49:00   6.5S   81.0W ML=4.4  EMSC   NEAR COAST OF NORTHERN PERU  

P: 27MAY2019 116133     6.0S   76.0W 4.0-5.5 AACAA  No. Peru                   

 

STRONG EARTHQUAKE HITS WESTERN ANDREANOF ILANDS, ALEUTIANS, ALASKA

 

EARTHQUAKE SUMMARY FOR MAY 23, 2019

 

The strongest earthquake in the world today was an M 6.1 in the Andreanof Islands, Aleutians, Alaska. NEIC reported it was felt with intensity III in Adak, Alaska. This is the largest earthquake in the western Andreanof Islands since an M 6.5 on August 15, 2018 and prior to that an M 6.2 on May 8, 2017 an M 6.4 on September 26, 2012. The earthquake in the Andreanof Islands today was preceded by several outer rise at 178,3 West longitude events in the past year. These included an M 4.7 at 178.3W on August 10, 2018. This summary had noted this as a possible outer rise earthquake at tht time as:

 

"The epicenter is south of the normal activity in the area and may be an outer-bank earthquake suggesting a larger upcoming event at this longitude in

the Andreanof Islands, Alaska."  (August 11, 2018)

 

Note that the M 6.5 on August 15, 2018 probably was an immediate quake after this outer-rise quake. Today's event could be considered a regional aftershock of the August 15 event. When a similar M 6.1 hit at 178,3 West longitude on (January 5, 2019):

 

"Several outer rise events in this area had suggested the possibility of a  strong earthquake at this longitude was coming." (January 6, 2019)

 

O: 23MAY2019 08:45:20  51.5N  178.3W Mw=6.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 20MAY2019 116031    51.0N  179.9W 3.5-5.6 BAAAA  Andreanoff Isls, Aleutians 

 

The strongest earthquake in the U.S. outside Alaska today was an M 4.2 in

Nevada.  Only two other such events of M>=4.2 have occurred in this area of Nevada in the past 30 years - an M 4.5 on January 15, 1993 and an M 4.2 on October 8, 2004. Forecast 115927 had expected today's earthquake was likely around May 19.

 

O: 23MAY2019 09:53:48  38.4N  116.6W ml=4.2  EMSC   NEVADA                       

P: 19MAY2019 115927    37.8N  115.8W 2.5-4.4 BAAAA  California/Nevada area     

 

The most unusual earthquake of the day was an M 4.7 in Madagascar. It was not reported felt in this area.  This is the strongest earthquake within about 200 km of this epicenter inh at least 30 years. Events of M 4.6-4.7 occurred nearby on January 5, 205 and October 30, 2015. This epicenter is located at 103 degrees from the epicenter of the M 7.5 in New Britain of May 14, adding to the increasing number of unusual events at this distance from New Britain in the past week. This had been detailed in the previous issue of this report when unusual quakes hit the South Pacific and Jalisco, Mexico. Unusual quakes at this distance also occurred in Colorado (M 3.8 and in the Central Pacific Rise (M 5.9) in the past week. This summary noted in the previous issue:

 

"Far-field triggering from the M 7.5 in New Britain of May 14, 2019 continued unabated today. The strongest earthquakes of the day occurred at 101-102 degrees from that epicenter - an M 5.4 in the area south of Easter Island and a series of events up to M 4.7 in Jalisco, Mexico. Seismic energy is concentrated at this distance  following major events on the earth's surface after reflection and refraction off the core-mantle boundary returns this energy to this distance zone on the surface. Previous activity at this distance from New Britain in the past week included an M 3.8 in Colorado and an M 5.8 in the Central East Pacific

Rise" (May 23, 2019)

 

O: 23MAY2019 06:30:18  13.9S   48.9E mb=4.7  EMSC   MADAGASCAR                   

 

The enhanced seismicity in western Mexico in Jalisco State also continued at 103 degrees from New Britain. Today an M 4.5 was located abou 50-100 km east of the M 4.7 yesterday in Jalisco and was accompanied by a series of lighter shocks in the region. Forecast 115893 and 115907 had expected today's activity  was likely around May 20-21.

 

O: 23MAY2019 16:53:17  18.6N  106.3W ML=3.9  EMSC   OFF COAST OF JALISCO, MEXICO

O: 23MAY2019 20:03:02  18.8N  106.3W ML=3.8  EMSC   OFF COAST OF JALISCO, MEXICO

O: 23MAY2019 09:59:37  19.1N  105.4W ML=3.7  EMSC   OFFSHORE JALISCO, MEXICO

O: 23MAY2019 09:11:30  19.2N  107.1W ML=3.9  EMSC   OFF COAST OF JALISCO, MEXICO

O: 23MAY2019 18:52:45  18.4N  106.5W mb=4.5  EMSC   OFF COAST OF JALISCO, MEXICO 

P: 20MAY2019 115893    19.0N  104.0W 3.5-5.3 BABAA  Michoacan, Mexico           

P: 21MAY2019 115907    20.0N  109.0W 3.5-4.9 ABCAA  Gulf of California         

 

FAR-FIELD TRIGGERING FROM NEW BRITAIN CONTINUES

 

EARTHQUAKE SUMMARY FOR MAY 22, 2019

 

Far-field triggering from the M 7.5 in New Britain of May 14, 2019 continued unabated today. The strongest earthquakes of the day occurred at 101-102 degrees from that epicenter - an M 5.4 in the area south of Easter Island and a series of events up to M 4.7 in Jalisco, Mexico. Seismic energy is concentrated at this distance  following major events on the earth's surface after reflection and refraction off the core-mantle boundary returns this energy to this distance zone on the surface. Previous activity at this distance from New Britain in the past week included an M 3.8 in Colorado and an M 5.8 in the Central East Pacific

Rise as noted in previous issues of this summary:

 

 

"Earthquakes of M>=4 in this series, however, have not been frequent. The last within this active zone with M>=4 was an 4.0 more than a year ago on December 23, 2016  and prior to that on February 6, 2015 and September 13, 2011, all with M 4.0. the last of larger magnitude in the area occurred in conjunction with a major GRB and the Washington D.C. quake of August 23, 2011 with M 5.3 - the largest ever recorded in this area." (December 31, 2017)

 

"Today's earthquake in Colorado is located at 101 degrees from the M 7.5 in New Guinea of May 14, 2019. Seismic energy is concentrated at this distance from major events on the earth's surface and can help to trigger subsequent seismicity in this distance zone. The last event of M>=3.8 in this area of Colorado was preceded several days earlier on December 17, 2016 by an M 7.9 at the same epicenter as this month's M 7.5. This is probably not a coincidence.

 

"Seventh nodal seismicity continued today with strong seismicity in the New  Britain area and events in the U.S. in Colorado and off the coast of Oregon at 102 and 51-52 degrees from the great quakes in New Zealand, Solomon Islands and New Britain. This type of triggering has been notable throughout the last week." December 24, 2016)

 

This type of triggering from New Britain was most recently noted in this summary when an M 5.8 occurred on the Central East Pacific Rise on May 16. This summary noted it at the time as:

 

"This earthquake (on the East Pacific Rise) is at 101 degrees from the M 7.5 in New Britain of May 14. Seismic energy is concentrated at this distance on the surface following major events after reflecting and refracting off internal earth boundaries. Seismic promotion is often observed at this distance following major events and today's earthquake is one of these." (May 16-17, 2019; May 20-21, 2019) 

 

 

The strongest earthquake in the world today was an M 5.4 southeast of Easter Islands and west of central Chile. It was not felt in this remote area. It may have been promoted by tidal stresses as it occurred near local solar noon, a time when tidal stresses are maximized. The last earthquake within about 200 km of this epicenter of M>=5.4 occurred December 19, 2018 with M 6.3 to the west of today's epicenter. This epicenter is at 102 degrees from the New Britain M 7.5 of May 14, 2019.

 

O: 22MAY2019 17:36:24  36.1S   99.8W Mw=5.4  EMSC   SOUTHEAST OF EASTER ISLAND   

O: 22MAY2019 17:36:19  35.8S  100.0W mw=5.4  ANSS   Southeast of Easter Island"

 

The most active area in the world today was in western Mexico where events of M 4.7, 4.2 and 4.2 occurred in Jalisco, Mexico. This is the strongest activity in this area since an M 5.6 on November 27, 2018 and an M 5. on November 3, 2017.

Forecast 115907 had expected today's activity was likely in western Mexico around May 21. This epicenter is at 101-102 degrees from the New Britain M 7.5 of May 14, 2019.

 

O: 22MAY2019 21:55:31  18.7N  107.2W mb=4.7  EMSC   OFF COAST OF JALISCO, MEXICO 

O: 22MAY2019 14:14:01  18.8N  107.0W ML=4.2  EMSC   OFF COAST OF JALISCO, MEXICO 

O: 22MAY2019 21:53:04  18.8N  107.0W ML=4.2  EMSC   OFF COAST OF JALISCO, MEXICO 

P: 21MAY2019 115907    20.0N  109.0W 3.5-4.9 ABBAA  Gulf of California         

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in the Fox Islands, Aleutians, Alaska. An earthquake of M 4.2 hit the area on May 4, 2019 but the last of significantly larger magnitude was an M 4.5 on January 14, 2019 and an M 4.4 on February 6, 2019. Forecast 116037 had expected today's event within about 100 km of the epicenter in the Fox Islands was likely around May 18.

 

O: 23MAY2019 05:20:48  52.2N  170.8W mb=4.0  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 18MAY2019 116037    52.4N  169.4W 3.5-4.9 BAAAA  Fox Islands, Aleutians     

 

An unusual earthquake of M 3.5 hit in the Southern Yukon Territory, Canada today. NEIC reported this earthquake of M 3.5 in Southern Yukon Territory, Canada was felt with intensity II-III in the area(s) of Whitehorse, Yukon, Canada. This is the strongest earthquake within about 100 km of this epicenter since an M 3.9 on October 22, 2018 and prior to that another M 3.9 on June 10, 2018. It was followed by an M 2.6 aftershock about half an hour later. Forecast 116053 had expected today's earthquake within about 25 km of the epicenter was likely in mid-May.

 

O: 23MAY2019 04:44:26  60.2N  136.8W ml=3.5  EMSC   SOUTHERN YUKON TERRITORY, CANA

O: 23MAY2019 05:16:46  60.2N  136.9W ML=2.5  EMSC   SOUTHERN YUKON TERRITORY, CANA

P: 16MAY2019 116053    60.0N  137.0W 3.2-5.5 CAAAA  Central Alaska              

 

 

 

 

MODERATE M 5.6 FELT IN ANDAMAN ISLANDS. INDIA

 

EARTHQUAKE SUMMARY FOR MAY 21, 2019

 

The strongest earthquake in the world today was an M 5.6 in the Andaman Islands, India. NEIC reported it was felt with intensity II in Port Blair, Andaman Islands and in Kathu, Phuket, Thailand. The last earthquake within about 200 km of this epicenter with M>=5.6 was an M 5.6 on February 13, 2018 and prior to that an M 5.9 on June 18, 2010. Forecast 115878 had expected a moderate earthquake in the Andaman region was likely around May 19.

 

O: 22MAY2019 00:39:31  13.8N   93.0E Mw=5.6  EMSC   ANDAMAN ISLANDS, INDIA REGION

P: 19MAY2019 115878    13.0N   96.0E 4.0-5.4 BACAA  Andaman Islands            

 

The largest earthquake in the U.S. or Canada today was an M 3.8 in Southern Alaska. The last earthquake of M>=3.8 within about 100 km of this epicenter was an M 4.3 on March 10, 2019 and prior to that an M 3.9 on February 20, 2019. Forecast 116055 had expected today's event was likely in this area around May 19.

 

O: 21MAY2019 10:12:29  59.1N  153.0W ml=3.8  EMSC   SOUTHERN ALASKA              

P: 19MAY2019 116055    60.3N  153.0W 3.2-4.9 ABAAA  Central Alaska             

 

A series of light earthquakes shook areas of Europe today. These included an M 4.4 in Southern Greece3 and an M 4.0 in Southern Italy. The most unusual of these, however was an M 3.4 in the Netherlands. The last earthquake in the Netherlands with M>=3.4 within about 150 km of today's epicenter occurred more than six years ago on February 7, 2013. The lastof larger magnitude was an M 3.8 on August 8, 2006. NEIC reported this earthquake of M 3.2 in the Netherlands was felt with intensity IV in Groningen, Netherlands and II-III in the area(s) of Haren, Netherlands. Forecast 116040 had expected an event in the Netherlands was likely south of today's epicenter around May 1.

 

O: 22MAY2019 03:48:59  53.3N    6.5E ML=3.4  EMSC   THE NETHERLANDS              

P: 21MAY2019 116040    51.0N    6.0E 3.0-4.6 ACAAA  Netherlands/Belgium        

 

O: 21MAY2019 08:58:17  37.9N   21.3E mb=4.4  EMSC   SOUTHERN GREECE              

P: 20MAY2019 115952    37.0N   21.0E 3.0-4.7 AAAAA  No. Greece                 

 

O: 21MAY2019 08:13:32  41.3N   16.3E mb=4.0  EMSC   SOUTHERN ITALY               

P: 14MAY2019 115998    41.0N   10.0E 3.0-5.1 CACAA  Italy                      

 

An unusual earthquake of M 4.8 also occurred in the Los Rios area of Chile today. CSN reported this earthquake was felt with intensity   V in  Los Rios at Corral, Futrono, La Union, Los Lagos, Mariquina, Paillaco, Panguipulli, Valdivia; IV in Lago Ranco, and Rio Buena and III in Lanco, Mafil, Mahuin; in Los Lagos with IV in Fresia, Puerto Montt, Puerto Varas, San Juan de la Costa, III in Ancud, Castro, Halaihue, Osorno, Rio Negro; in La Araucania with III in Gorbea, Loncoche and Tolten, Chile. NEIC reported this earthquake of M 4.6 in Los Lagos, Chile was felt with intensity V in Osomo, Chile; IV in Rio Bueno and Valdivia, Los Lagos, Chile and II-III in the area(s) of La Union, Puerto Varas and Puerto Montt, Los Lagos, Chile. This earthquake occurred within about 30 minutes of local solar midnight and was probably promoted by tidal stresses which maximize at this hour. The last earthquake of M>=4.8 within about 100 km of this epicenter occurred June 4, 2011 with M 4.9. Subsequent earthquakes occurred about 150 km southwest of this with M 4.8-5.0. The last such event in the 150 km radius was an M 5.0 on June 23, 2017 about 150 km northeast of today's epicenter. Forecast 116092 had expected this activity was likely in mid-May.

 

O: 22MAY2019 04:23     40.5S   72.9W mb=4.8  GUC    Los Rios at Corral, Futrono, L

P: 16MAY2019 116092    39.0S   73.0W 4.0-5.5 CBAAA  Central Chile              

 

MODERATE QUAKE IN CENTRAL ARGENTINA

 

EARTHQUAKE SUMMARY FOR MAY 20, 2019

 

The strongest earthquake in the world today was an M 5.6 in San Juan, Argentina. NEIC reported maximum intensity V in Illapel, Chile; IV in San Juan and Mendoza, Argentina and Ovalle,  Vicuna, Quillota, and Lampa, Chile and II-III in La Ligua, Calera and La serena, Coquimbo, Chile. This is the strongest earthquake in Argentina within about 100 km of this epicenter since events of  M 6.4 on November 20, 2016 and of M 6.0 on February 27, 2010. The only other such event in the area since 2005 was an M 5.6 about 150 km to the southwest of today's epicenter on October 11, 2012. Forecast 116091 and 116093 had expected this event within about 100 km of this epicenter was likely around May 16-18. This epicenter is at 144 degrees from the M 6.8 in Sulawesi of April 12, 2019. Seismic energy is concentrated on the surface at this distance following strong surficial disturbances and can help promote additional seismicity.

 

O: 20MAY2019 11:18:32  31.5S   70.2W Mw=5.6  EMSC   SAN JUAN, ARGENTINA          

O: 20MAY2019 11:18:32  31.5S   69.9W mw=5.6  ANSS   WSW of Calingasta Argentina

P: 16MAY2019 116091    31.0S   69.0W 4.0-5.4 BAAAA  Central Chile              

P: 18MAY2019 116093    30.0S   70.0W 4.0-5.6 ABAAA  Coast Central Chile        

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the eastern Andreanof Islands, Aleutians, Alaska. This is the largest earthquake within about 150 km of this epicenter since an M 5.9 on August 25, 2018. Today's event was not reported felt in this remote area. Forecast 116034 had expected this event within about 100 km of this epicenter was likely around May 19.

 

O: 20MAY2019 10:18:04  52.8N  172.5W mb=4.5  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 19MAY2019 116034    52.1N  172.8W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

A pair of unusual, but light, earthquakes occurred in the area of Washingtono State and Alberta Canada today with M 2.5 and 2.9. These were not reported felt. The earthquake in Washington occurred in the Olypmic Peninsula is the strongest within about 50 km of this epicenter since June 9, 2018 when an M 4.7 hit the area.  It had been expected around May 19 in forecast 116025.

 

O: 20MAY2019 20:35:56  48.2N  124.3W Ml=2.5  EMSC   OLYMPIC PENINSULA, WASHINGTON

P: 19MAY2019 116025    48.0N  123.0W 2.0-3.9 AAAAA  Washington state, U.S.     

 

Two events of M>=3 have occurred within about 100 km of the Alberta epicenter since 2010  an M 3.3 on November 22, 2017 and an M 3.1 on October  22, 2018. Forecast 116027 had expected moderate seismicity south of this around May 17.

 

O: 20MAY2019 21:22:05  49.1N  112.8W Ml=2.9  EMSC   ALBERTA, CANADA              

P: 17MAY2019 116027    46.4N  111.4W 2.0-4.1 BCAAA  Yellowstone/Wyoming         

 

STRONG EARTHQUAKES CONTINUE IN LOYALTY ISLANDS

 

EARTHQUAKE SUMMARY FOR MAY 19, 2019

 

Strong seismicity continued today in the region of the Loyalty Islands with events of M 6.2 and 5.9-6.0. These were reported with intensity II-III in Isangel, Tafea, Vanuatu. The first shock in this series occurred yesterday and was reported here as:

 

"The strongest earthquake in the world today was an M 6.2-6.3 in the area southeast of the Loyalty Islands and Vanuatu. NEIC reported it was felt with intensity II in Isangel, Tafea, Vanuatu. It occurred within about 30 minutes of local solar noon, a prime time for tidal stresses to help promote seismicity with today's full moon as noted in previous issues ... Today's earthquake is the strongest in the Loyalty Islands within about 150 km of this epicenter since the strong series in the area that began on December 5, 2018 with an M 7.5 and is the strongest in that area in nearly half a year." (May 18-19, 2019)

 

This activity in the Loyalty Islands is located at 24 degrees from the M 7.5 in New Britain (node 15). This is an active node and the activity in the Loyalty Islands may have been promoted by energy from New Britain.

 

O: 19MAY2019 14:56:49  21.5S  169.6E Mw=6.2  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O: 19MAY2019 15:06:16  21.5S  169.7E mb=4.9  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O: 19MAY2019 14:27:10  21.6S  169.7E Mw=6.1  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 19MAY2019 116082    21.0S  169.0E 4.0-5.8 AAAAA  Loyalty Islands            

 

An earthquake of M 3.8 occurred on the New Mexico-Colorado border region near Trinidad, Colorado today. NEIC reported it was felt with maximum intensity V in Raton, New Mexico and II-III in Weston and La Veta, Colorado. Two minor events occurred yesterday in this region as reported in the previous issue of this summary. This activity is located at 102 degrees from the M 7.5 in New Britain of May 14. Seismic energy for strong surface events concentrates at this distance from those events and can help promote seismicity at this distance. The series in the Trinidad, Colorado area began in September 2001, several days before the Trade Tower Disaster of 9-11-2001. It has continued off-and-on since then. The exact cause has been investigated by the USGS but no definitive explanation has emerged from these studies. In general, the larger earthquakes in the area have occurred at new and full moons when tidal stresses are maximized. Today's event fits this previous pattern.

 

The tidal forecast associated with this full moon as published in previous issues of this summary had noted:

 

"The full moon will arrive on May 18 at 21:11 UT. Longitudes which are sub-solar at this time are near 140W while those which are sub-lunar are near 40E. These include areas of eastern Europe and the Mediterranean and the East Africa Rise in the east and eastern Alaska and the coast of North America on the west. These are most likely to see enhanced tidal triggering in the next week. Other areas are also subject to tidal triggering with the new moon and tidal enhancement  can occur in many areas at times of high astronomical tides." (May 15-19, 2019)

 

The last earthquake in this series with M>=3.8 was an M 4.0 on December 30, 2017. This occurred in conjunction with an eclipse and super-moon of January 2, 2018. At the time this summary noted:

 

"Earthquakes of M>=4 in this series, however, have not been frequent. The last within this active zone with M>=4 was an 4.0 more than a year ago on December 23, 2016  and prior to that on February 6, 2015 and September 13, 2011, all with M 4.0. the last of larger magnitude in the area occurred in conjunction with a major GRB and the Washington D.C. quake of August 23, 2011 with M 5.3 - the largest ever recorded in this area." (December 31, 2017)

 

Forecast 115939 had expected today's event was likely within about 25 km of the epicenter around May 20.

 

Today's earthquake in Colorado is located at 101 degrees from the M 7.5 in New Guinea of May 14, 2019. Seismic energy is concentrated at this distance from major events on the earth's surface and can help to trigger subsequent seismicity in this distance zone. The last event of M>=3.8 in this area of Colorado was preceded several days earlier on December 17, 2016 by an M 7.9 at the same epicenter as this month's M 7.5. This is probably not a coincidence.

 

"Seventh nodal seismicity continued today with strong seismicity in the New Britain area and events in the U.S. in Colorado and off the coast of Oregon at 102 and 51-52 degrees from the great quakes in New Zealand, Solomon Islands and New Britain. This type of triggering has been notable throughout the last week." December 24, 2016)

 

This type of triggering from New Britain was most recently noted in this summary when an M 5.8 occurred on the Central East Pacific Rise on May 16. This summary noted it at the time as:

 

"This earthquake (on the East Pacific Rise) is at 101 degrees from the M 7.5 in New Britain of May 14. Seismic energy is concentrated at this distance on the surface following major events after reflecting and refracting off internal earth boundaries. Seismic promotion is often observed at this distance following major events and today's earthquake is one of these." (May 16-17, 2019) 

 

O: 19MAY2019 10:43:19  37.0N  105.0W Mw=3.8  EMSC   COLORADO                     

P: 20MAY2019 115939    37.0N  105.2W 2.0-4.0 AAAAA  Colorado area              

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in the Anchorage, Alaska aftershock zone. NEIC reported maximum intensity IV in Alaska at Elmendorf AFB and II-III in Anchorage, Willow, Chugiak, Eagle River, Girdwood, Kenai, Moose Pass, Talkeetna, Cooper Landing and Palmer, Alaska. A similar M 4.1-4.2 event hit the area on May 10, 2019, the first such aftershock in the region since February 18, 2019 when an M 5.5 rattled the zone. Forecast 116054 had expected today's earthquake within about 25 km of this epicenter was likely around May 20.

 

O: 19MAY2019 07:01:54  61.3N  150.0W ML=4.1  EMSC   SOUTHERN ALASKA              

P: 20MAY2019 116054    61.1N  150.2W 3.2-4.9 AAAAA  Central Alaska             

 

An unusual earthquake of M 3.0 occurred in southern England today. NEIC reported it was felt with intensity I-II in England at Swanage, Bournemouth, Portsmouth, Codsall and Grantham, United Kingdom. This follows two minor events in the English Channel  of M 2.9 and 3.0 on May 15. the first in more than a year in the English Channel. They occurred about 150 km east of today's epicenter. The last earthquake within about 100 km of today's epicenter in southern England with M>=3 was an M 3.9 on July 14, 2011. The last and only event closer to today's epicenter of M>=3 in the past 30 years was an M 3.0 on November 26, 1991. Forecast 116051 had expected today's earthquake was likely around May 17.

 

O: 19MAY2019 09:51:52  50.6N    1.7W ML=3.0  EMSC   ENGLAND, UNITED KINGDOM      

P: 17MAY2019 116051    51.0N    3.0W 3.0-4.5 AAAAA  United Kingdom             

 

STRONG QUAKE SHAKES LOYALTY/VANUATU ISLANDS WITH FULL MOON

 

EARTHQUAKE SUMMARY FOR MAY 18, 2019

 

The strongest earthquake in the world today was an M 6.2-6.3 in the area southeast of the Loyalty Islands and Vanuatu. NEIC reported it was felt with intensity II in Isangel, Tafea, Vanuatu. It occurred within about 30 minutes of local solar noon, a prime time for tidal stresses to help promote seismicity with today's full moon as noted in previous issues of this summary:

 

"The full moon will arrive on May 18 at 21:11 UT. Longitudes which are sub-solar at this time are near 140W while those which are sub-lunar are near 40E. These include areas of eastern Europe and the Mediterranean and the East Africa Rise in the east and eastern Alaska and the coast of North America on the west. These are most likely to see enhanced tidal triggering in the next week. Other areas are also subject to tidal triggering with the new moon and tidal enhancement  can occur in many areas at times of high astronomical tides." (May 15-18, 2019)

 

Today's earthquake is the strongest in the Loyalty Islands within about 150 km  of this epicenter since the strong series in the area that began on December 5, 2018 with an M 7.5 and is the strongest in that area in nearly half a year.  Forecast 116082 had expected today's event in this area was likely around May 19.

 

O: 19MAY2019 01:23:27  21.6S  169.9E Mw=6.2  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O: 19MAY2019 01:23:29  21.7S  169.8E mw=6.3  ANSS   Tadine New Caledonia

P: 19MAY2019 116082    21.0S  169.0E 4.0-5.8 AAAAA  Loyalty Islands            

 

The strongest earthquake in the U.S. or Canada today also appears to have been promoted by tidal stresses associated with the full moon. This event occurred at about 130W longitude within about an hour of local solar noon, like the M 6.3 in the Loyalty Islands. Tidal stresses a maximized at this hour and probably helped promote this earthquake at this time. NEIC reported it was felt in Oregon at Salem and Portland and in Snohomish, Washington with intensity II-III. This is the strongest earthquake off the coast of Oregon within about 100 km  of this epicenter since an M 4.3 on November 16, 2018. Forecasts 116015 and 116016 had expected this event within about 50 km of today's epicenter was likely in mid-May.

 

O: 18MAY2019 20:43:58  43.4N  126.9W mb=4.2  EMSC   OFF COAST OF OREGON          

P: 14MAY2019 116016    43.1N  126.5W 3.0-4.7 BAAAA  Off Coast of Oregon        

P: 19MAY2019 116015    41.8N  126.9W 2.5-4.6 ABAAA  Off Coast of No. Calif     

 

MODERATE QUAKE IN OKLAHOMA; STRONG SEISMICITY IN INDONESIA CONTINUES

 

EARTHQUAKE SUMMARY FOR MAY 17, 2019

 

The strongest earthquake in the world today was an M 6.0 in Papua, New Ireland, PNG. NEIC reported it was felt with intensity II in Namatanai, New Ireland. This is a regional aftershock, the largest to date, of the M 7.5 which hit the area of New Britain on May 14. 2019. Forecast 115864 had expected this event within the aftershock zone was likely around May 20.

 

O: 17MAY2019 22:37:52   4.7S  152.9E Mw=5.9  EMSC   NEW BRITAIN REGION, P.N.G.   

O: 17MAY2019 22:37:52   4.7S  152.9E Mw=6.0  ANSS   NEW BRITAIN REGION, P.N.G.   

P: 20MAY2019 115864     4.0S  153.0E 4.0-5.5 BAAAA  New Britain                

 

A moderately strong M 5.6-5.9 hit the region south of Java, Indonesia today. NEIC reported it was felt with intensity III in Wengon, Java, Indonesia. This is the strongest earthquake near Java within about 200 km of this epicenter since an M  6.0 about 200 km to the northwest on April 6, 2016. Forecast 115872 had expected today's event in this area was likely with magnitude up to M 5.6 around May 17. This may have been promoted by the recent geomagnetic storm as it occurred near the geomagnetic equator. The geomagnetic forecast in this

summary yesterday had read:

 

"This continues the strongest geomagnetic storm at low latitudes since AP reached 76 on August 26, 2018. Current solar flare activity is likely to increase and enhance seismicity along the geomagnetic equator in the next two days. Stormy conditions in the next two days could bring increased seismicity near the geomagnetic equator and at high latitudes over the next four days." (May 15-17, 2019) 

 

BMG reported this event at M 5.9 was felt with intensity II-III in Pangandaran, Tasikmalaya, Cilacap, Banyumas, Karangkates, Blitar, Tulungagung, Banjarnegara, Kebumen, Bantul and Solo, Java, Indonesia.

 

O: 18MAY2019 01:51:31  09.7S  108.6E MS=5.9  BMG  Felt with intensity II-III

O: 18MAY2019 01:51:34   9.3S  108.8E Mw=5.6  EMSC   SOUTH OF JAVA, INDONESIA     

P: 17MAY2019 115872     9.0S  108.0E 4.0-5.6 AAAAA  So. of Java                

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in Oklahoma. NEIC reported it was felt with maximum intensity VI in Deer Creek, Oklahoma; V in Lamont and Medford; IV in Billings, Wakita and II-III in Pond Creek, Tonkawa, Enid, Carrier. It was felt hundreds of km from the epicenter including at Oklahoma City, Skiatook, Sand Spring, in Newton, Kansas, and possibly in Arkansas, Texas, Missouri, Iowa, Mississippi, Colorado, Alabama, Illinois and Wisconsin. This follows an increase in seismicity in this area yesterday as described in the previous summary:

 

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

 

Severe tornadic weather occurred in Oklahoma and Kansas at the time and may have enhanced this earthquake. Considerable damage was reported with these tornadoes. This may be the strongest series of the current season in the area.

 

The last earthquake in Oklahoma within about 100 km of today's M 4.4 epicenter occurred as an M 4.4 nearly a year ago on June 9, 2018. The last of significantly larger magnitude in this area was an M 5.6-5.8 on September 3, 2016. That event occurred in conjunction with an annular solar eclipse  and new moon which occurred on September 1. Forecast 115982 had expected today's event within this area was likely around May 17.

 

O: 17MAY2019 20:33:14  36.7N   97.7W Mw=4.4  EMSC   OKLAHOMA                     

O: 17MAY2019 21:51:12  36.7N   97.7W mb=2.3  EMSC   OKLAHOMA                     

P: 17MAY2019 115982    37.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

STRONG EARTHQUAKES IN NICARAGUA AND NORTHERN EAST PACIFIC RISE

 

EARTHQUAKE SUMMARY FOR MAY 16, 2019

 

The strongest earthquake felt in the world today was an M 5.8-5.9 near the coast of Nicaragua. NEIC reported it was felt with intensity V in Leon, Nicaragua; IV in Chinandega, Usulutan and San Sebastian, El Salvador and II-III in Honduras at San Lorenzo, Tegucigalpa; in Nicaragua at Managua and San Rafael and in El Salvador at San Miguel. It was probably promoted by high tidal stresses associated with the full moon as noted in previous issues of this summary:

 

"The full moon will arrive on May 18 at 21:11 UT. Longitudes which are sub-solar at this time are near 140W while those which are sub-lunar are near 40E. These include areas of eastern Europe and the Mediterranean and the East Africa Rise in the east and eastern Alaska and the coast of North America on the west. These are most likely to see enhanced tidal triggering in the next week. Other areas

are also subject to tidal triggering with the new moon and tidal enhancement  can occur in many areas at times of high astronnomical tides." (May 16-17, 2019)

 

This is the strongest earthquake within about 100 km of this epicenter since an M 5.9 on April 2, 2018. The last of larger magnitude was an M 7.0 on November 24, 2016. Forecast 115884 had expected today's event within this area was likely around May 15. This activity is at the third node (120 degrees) from the M 7.5 in New Britain of May 14 and was probably promoted from that source. An earthquake of M 5.2 in Maule, Chile was also at the third node from New Britain today.

 

O: 16MAY2019 22:30:55  12.1N   89.1W mb=4.8  EMSC   OFF THE COAST OF EL SALVADOR 

O: 16MAY2019 16:51:00  12.6N   88.0W ML=4.0  EMSC   NEAR COAST OF NICARAGUA      

O: 17MAY2019 02:33:34  12.6N   88.0W ML=4.3  EMSC   NEAR COAST OF NICARAGUA      

O: 16MAY2019 16:25:00  12.6N   88.1W ML=4.3  EMSC   OFFSHORE EL SALVADOR         

O: 16MAY2019 16:22:17  12.8N   87.7W Mw=5.9  EMSC   NEAR COAST OF NICARAGUA      

O: 16MAY2019 16:22:17  12.7N   87.8W mw=5.8  ANSS   WSW of Jiquilillo Nicaragua

P: 15MAY2019 115884    13.0N   89.0W 3.5-5.1 AAAAA  Coast of Central America   

 

An earthquake of M 5.8 also hit the Central East Pacific Rise area south of  Nicaragua today. An earthquake of M 5.8-5.9 hit this area last on January 30, 2019 but the last of larger magnitude in the area within about 300 km of this epicenter was an M 6.0 on September 11, 2013. Forecast 115596 had expected today's event within about 100 km of this epicenter was likely around May 10. This earthquake is at 101 degrees from the M 7.5 in New Britain of May 14. Seismic energy is concentrated at this distance on the surface following major events after reflecting and refracting off internal earth boundaries. Seismic promotion is often observed at this distance following major events and today's earthquake is one of these. 

 

O: 16MAY2019 22:52:43   4.6S  105.8W mb=5.4  EMSC   CENTRAL EAST PACIFIC RISE    

O: 16MAY2019 22:52:43   4.6S  105.8W mb=5.8  ANSS   CENTRAL EAST PACIFIC RISE     

P: 10MAY2019 115596     5.0S  105.0W 4.0-5.4 CAAAA  No. East Pacific Rise      

 

An unusual earthquake of M 1.2 occurred in the Arctic Ocean of Canada today. It was not reported felt in this epicentral area which is near the north geomagnetic pole, a location which can be activated following strong geomagnetic storms such as that of two days ago. The geomagnetic forecast had read:

 

 

"This continues the strongest geomagnetic storm at low latitudes since AP reached 76 on August 26, 2018. Current solar flare activity is likely to increase and enhance seismicity along the geomagnetic equator in the next two days. Stormy conditions in the next two days could bring increased seismicity near the geomagnetic equator and at high latitudes over the next four days." (May 14-16, 2019) 

 

The last earthquake to have been reported by NEIC within about 300 km of this epicenter was an M 4.0 on August 18, 2008. Forecast 116064 had expected today's event was likely within about 100 km around May 20. This event is at 102 degrees from the New Britain quake of May 6 and was probably promoted from that source.

 

O: 16MAY2019 06:30:01  81.0N   90.6W MB=1.2  ECAN Arctic Ocean                   

P: 20MAY2019 116064    80.0N   90.0W 4.0-5.8 BAAAA  Arctic Ocean Region        

 

The strongest earthquake in the U.S. or Canada today occurred in the Anchorage, Alaska aftershock zone. NEIC reported this earthquake of M 3.5 in the Anchorage Alaska aftershock zone was felt with intensity II-III in the area(s) of Wasilla, Chugiak, Willow, Fort Richardson, Elmendorf, Anchorage, Talkeetna, and Girdwood, Alaska. The last aftershock of M>=3.5 in this zone was an M 3.8 on May 7, 2019 and an M 4.0 on April 28, 2019, the only such events since late March, 2019.

Forecast 116054 had expected today's event within about 50 km was likely around May 20.

 

O: 17MAY2019 00:26:36  61.6N  149.7W ML=3.5  EMSC   SOUTHERN ALASKA              

P: 20MAY2019 116054    61.1N  150.2W 3.2-4.9 BAAAA  Central Alaska             

 

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

 

NEIC reported the earthquake of M 2.5 in Oklahoma was felt with intensity II-III in the area(s) of Cushing and Oklahoma City, Oklahoma. An M 3.4 was felt earlier in the day near Cushing, Oklahoma with intensity IV. An M 3.3 may have been felt with intensity II in Oklahoma at Okmulgee, Norman, and Cushing. This activity is located at 109 degrees from New Britain and may have been promoted from that source.

 

O: 17MAY2019 02:18:36  36.0N   96.8W mb=2.3  EMSC   OKLAHOMA

O: 17MAY2019 00:38:08  36.0N   96.8W mb=2.5  EMSC   OKLAHOMA

O: 16MAY2019 23:50:13  36.0N   96.8W mb=2.7  EMSC   OKLAHOMA

O: 16MAY2019 22:53:43  36.0N   96.8W mb=3.4  EMSC   OKLAHOMA

O: 17MAY2019 02:58:34  36.0N   96.8W mb=2.2  EMSC   OKLAHOMA                     

P: 17MAY2019 115982    37.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

An M 3.3 also occurred in southern Oklahoma today. This also was probably promoted by strong tidal effects as it occurred within about ten minutes of local solar noon, a prime time for tidal effects on seismicity.

 

O: 16MAY2019 18:19:47  35.1N   96.3W mb=3.3  EMSC   OKLAHOMA                     

P:  9MAY2019 115710    35.0N   96.0W 2.0-4.1 CAAAA  Southern Plains            

 

An earthquake of M 4.1 shook the region of Haiti, Caribbean today. This is the strongest earthquake in Haiti within about 100 km of this epicenter since an  M 4.6 on February 17, 2018 and an M 4.3 on Sepetmber 2, 2017. An event of M 7.0  on January 12, 2010 occurred near today's epicenter killing hundreds of thousands and causing a decade-long turmoil in that nation's economy and sociology. Forecast 115904 had expected activity in this area around May 21. This activity is at 146 degrees from the large quakes in New Britain, a distance at which seismic energy is concentrated on the surface following major earthquakes. It is likely that those earthquakes helped promote today's activity.

 

O: 16MAY2019 12:37:27  18.4N   73.0W ML=4.1  EMSC   HAITI REGION                 

O: 16MAY2019 12:33:11  18.5N   72.9W ML=3.4  EMSC   HAITI REGION

O: 16MAY2019 12:43:38  18.5N   73.0W ML=3.7  EMSC   HAITI REGION

P: 21MAY2019 115904    20.0N   71.0W 3.0-4.6 BBBAA  Bahamas/No. Caribbean      

 

GEOMAGNETIC STORM CONTINUES TO AFFECT SEISMICITY

 

EARTHQUAKE SUMMARY FOR MAY 15, 2019

 

The strongest earthquake in the world today was an M 5.7 aftershock in New Britain. NEIC reported it was felt with intensity II-III in Kokopo, East New Britain, PNG. This is an aftershock of the M 7.5-7.7 which hit the area on May 14. Both were probably promoted by the strongest geomagnetic storm in more than eight months. That storm coincided with the M 7.5. in New Britain, also the strongest earthquake in the world in eight months. Forecasts 115864 and 115866 had expected this activity in New Britain/Ireland was likely around May 15-20.

 

O: 16MAY2019 01:24:02   5.2S  152.6E Mw=5.7  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 15MAY2019 115866     4.0S  151.0E 4.0-5.4 ABBAA  New Ireland                

P: 20MAY2019 115864     4.0S  153.0E 4.0-5.5 BBAAA  New Britain                

 

An unusual earthquake of M 4.8 occurred today in the eastern Mediterranean Sea to the west of Israel. NEIC reported this earthquake of M 4.8 in the eastern Mediterranean Sea  was felt with intensity V in Bet Shamesh, Jersalen and IV in Azur Tel Aviv, Israel and II-III in the area(s) of Israel at Bat Yam, Tel Aviv, Herzelyya, Rehovot, Gadera, Mevasserat and Jerusalem. This is the strongest earthquake within about 100 km of this epicenter since an M 5.1 on October 19, 2012, the only such regional event in the past 30 years. an M 5.2 hit about 200 km southwest of today's epicenter on January 17, 2013. Forecast 115983 had expected a moderate regional event was likely around May 13.

 

O: 15MAY2019 16:53:45  32.7N   32.6E mb=4.8  EMSC   EASTERN MEDITERRANEAN SEA    

P: 13MAY2019 115983    35.0N   34.0E 3.5-5.3 ACAAA  Turkey                     

 

An unusual earthquake of M 4.7 also occurred in Southwestern Sakha, Siberia, Russia today. It was not reported felt in this remote area. The last earthquake of M>=4.7 within about 250 km of this epicenter occurred more than a year ago as an M 4.7 on April 12, 2018. The last of larger magnitude was an M 5.4 on January 26, 2009. This may be part of the expected enhancement of seismicity at high latitudes associated with the strong geomagnetic storm of the past several days described in previous issues as:

 

"This continues the strongest geomagnetic storm at low latitudes since AP reached 76 on August 26, 2018. Current solar flare activity is likely to increase and enhance seismicity along the geomagnetic equator in the next two days. Stormy conditions in the next two days could bring increased seismicity near the geomagnetic equator and at high latitudes over the next four days." (May 14-16, 2019) 

 

Forecast 116047 had expected today's event within about 50 km of this epicenter was likely around May 12.

 

 

O: 15MAY2019 19:31:43  57.4N  120.8E mb=4.7  EMSC   SOUTHWESTERN SAKHA, RUSSIA   

P: 12MAY2019 116047    57.0N  121.0E 3.0-4.6 BAAAA  So. Siberia                

 

Another high latitude area which may have been affected by the geomagnetic storm was the English Channel where earthquakes of M 2.9 and 3.0 occurred today. The first of these - the M 3.0 occurred within about 15 minutes of local solar noon, a prime time for tidal and geomagnetic effects on seismicity. This is the first event of M>=3 in the English Channel within about 100 km of this epicenter since an M 3.9 on July 14, 2011 and prior to that an M 3.1 in a swarm on November 18-19, 2008. Forecast 116051  expected activity in this region was likely around May 17.

 

O: 15MAY2019 11:45:09  50.0N    0.7E ML=3.0  EMSC   ENGLISH CHANNEL              

O: 15MAY2019 18:19:03  50.2N    0.2E ML=2.9  EMSC   ENGLISH CHANNEL              

P: 17MAY2019 116051    51.0N    3.0W 3.0-4.5 AABAA  United Kingdom             

 

LARGEST EARTHQUAKE & GEOMAGNETIC STORM IN 8 MONTHS SIMULTANEOUS

 

EARTHQUAKE SUMMARY FOR MAY 14, 2019

 

The strongest earthquake in the world today was an M 7.5-7.7 in the New Britain

region of Papua New Guinea. NEIC reported it was felt with maximum intensity VII

in Rabaul, New Britain and VI in Kokopo; V in Namatanai, New Ireland; IV in Arawa, Solomon Islands and II-III in Kavleng, New Ireland and within about 500 km of the epicenter. It was also reported felt with moderate to strong intensity in Port Vila, Lihir Island, Bougainville, Port Moresby with power blackouts in the Kokopo area. PTWC issued a tsunami warning but this was later withdrawn. Villagers near the epicenter on the west coast of New Ireland reported seeing the ocean recede but no damaging waves were recorded. Damage did occur in New Britain but immediate reports are unclear as to how great it was. This is the strongest earthquake in the world during the year 2019 to date. An M 7.5 hit the region of Ecuador on February 22, 2019, the largest previous during this year. This earthquake was simultaneous with the strongest geomagnetic storm since August 26, 2018 when AP reached 76. The last earthquake in the world of M>7.5 occurred shortly after the geomagnetic storm at the end of August - an M 7.9 on September 6, 2018 in the Fiji Islands. The last earthquake of M>=7.5 in the region of New Britain within about 400 km of today's epicenter was an M 7.9 on December 17, 2016 and prior to that an M 7.8 on November 16 and 17, 2000.

 

Readers of this summary should not be surprised by the relation between the geomagnetic storm today and the earthquake in New Guinea. On May 7, two major C-class solar flares, which probably led to today's geomagnetic storm, occurred in  conjunction with an M 7.2 in New Guinea. At the time this summary noted:

 

"A major earthquake of M 7.2 hit the region of eastern New Guinea today. ….This is the largest earthquake in the world since an M 7.5 in Ecuador on February 22, 2019 and one of only two such events during the year 2019. It occurred at an intermediate depth of 141 km reducing surface effects. The M 7.2 is the strongest earthquake within about 200 km of this epicenter in at least 30 years although an M 7.2 on May 15, 1992 and a similar M 7.2 on December 22, 1997 occurred just outside this distance range. The last in the 200 km range was an M 7.6 on February 8, 1987. Similar events occurred in February 1963; February, 1951; January, 1946; May, 1938 and February, 2007.

 

This event in New Guinea was probably promoted by a pair of strong C-class solar flares. This summary had noted these as:

 

"Solar flare activity today included a C9.9 and a C7.3 flare, the strongest recorded in the current year. The second of these occurred while New Guinea was directly anti-solar and probably helped promote the later M 7.2 in that area today. This flare activity is likely to increase and enhance seismicity along the geomagnetic equator in the next five days." (May 6-7, 2019)" (May 7, 2019)

 

When a moderate earthquake of M 5.3 in New Britain occurred yesterday, this report noted:

 

"The strongest earthquake in the world today was an M 5.3 in the region of New Britain. This epicenter is located near the geomagnetic equator and may have been promoted by the geomagnetic storm. It occurred near local solar midnight a time when geomagnetic effects are maximized. Further such seismicity including the possibility of a strong regional event is likely in the next several days." (May 13-14, 2019)

 

Another factor which probably led to enhanced seismicity in New Britain at this time was the passage of Tropical Cyclone Ann to the south of this epicenter at the time of the M 7.5-7.7 event. This summary had noted this possibility in previous issues as:

 

"Tropical Cyclone Ann (27P) continued today in the area south of New Guinea with winds up to 45 kts. It is expected track to the west over the next several days. Some seismic enhancement in the region of New Guinea and the Solomon Islands is possible at this time." (May 13-14, 2019)

 

Forecasts 115864 and 115866 had expected today's activity in New Ireland an New

Britain was likely within about 50 km of this epicenter around May 15-20.

 

O: 14MAY2019 14:36:33   3.8S  152.1E mb=5.0  EMSC   NEW IRELAND REGION, P.N.G.   

O: 14MAY2019 12:58:25   4.1S  152.6E Mw=7.5  EMSC   NEW BRITAIN REGION, P.N.G.   

O: 14MAY2019 13:38:20   4.2S  152.7E mb=5.0  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 15MAY2019 115866     4.0S  151.0E 4.0-5.4 AABAA  New Ireland                

P: 20MAY2019 115864     4.0S  153.0E 4.0-5.5 CAAAA  New Britain                

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the central Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area, The last event of M>=4.5 within about 150 km of this epicenter occurred as an M 4.8 on March 29, 2019. Forecast 116034 had expected regional activity to  the east was likely in the Andreanof Islands around May 14.

 

O: 14MAY2019 09:08:42  52.1N  176.2W mb=4.5  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 14MAY2019 116034    51.2N  174.4W 3.5-5.3 ABBAA  Andreanoff Isls, Aleutians 

 

QUIET MAY PRECEDE STRONG SEISMICITY

 

EARTHQUAKE SUMMARY FOR MAY 13, 2019

 

Quiet seismic conditions around the world today may precede a strongly enhanced seismic event. Effects from a major geomagnetic storm two days ago could set this off. This summary has previously noted this storm and its possible consequences as:

 

"Current solar flare activity is likely to increase and enhance seismicity along the geomagnetic equator in the next two days. Active conditions in the next two days could bring increased seismicity near the geomagnetic equator and at high latitudes over the next four days.  Today's storm reached maximum KP  mid-day at high latitudes. Areas near 90 W and 90 E near the geomagnetic equator are most likely to be immediately affected." (May 11-12, 2019)

 

This was revised in the current summary as:

 

" ... geomagnetic equator in the next two days. Active conditions in the next two days could bring increased seismicity near the geomagnetic equator and at high latitudes over the next four days.  Today's storm reached maximum KP  mid-day at high latitudes. Areas near 15 W and 165 E near the geomagnetic equator are most likely to be immediately affected and include the Eastern Pacific subduction zones and the Atlantic." (May 12-13, 2019)

 

The strongest earthquake in the world today was an M 5.3 in the region of New Britain. This epicenter is located near the geomagnetic equator and may have been promoted by the geomagnetic storm. It occurred near local solar midnight a time when geomagnetic effects are maximized. Further such seismicity including the possibility of a strong regional event is likely in the next several days. NEIC reported this earthquake of M 5.3 in New Britain, PNG was felt with intensity IV in the area(s) of Kimbe, West New Britain, PNG.  Today's event is one of only three during 2019 - the others were an M 6.1 on March 30, 2019 and an M 5.3 on January 12, 2019. Forecast 115868 had expected today's event was likely in this area around May 18,

 

O: 13MAY2019 12:54:21   6.4S  150.9E mb=5.3  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 18MAY2019 115868     7.0S  150.0E 4.0-5.4 BAAAA  New Ireland                

 

The most widely felt earthquakes in the world today occurred as a series in

Southern Greece.  NEIC reported this earthquake of M 4.9 in Southern Greece was felt with intensity VII in Varvassina; VI in Lithakia,; IV in Kardamas, Kalamakion and II-III in the area(s) of Greece at Planos, Messini and Kalamakion, Greece. An M 4.5 was reported felt with intensity II-III in Greece at Goumeron, Pantokrator, Planos and Kalstarion, Zakinthos, Greece.

NEIC reported the other earthquake of M 4.5 in Southern Greece was felt with intensity II-III in the area(s) of Zakinthos, Greece. The last event of M>=4.7 within about 100 km of this epicenter occurred as an M 4.9 on March 17, 2019. The last such event of M>=5 occurred as an M 5.2 on November 19, 2018. Forecast 115952 had expected today's event in this area was likely around March 13. This activity is located at 100 degrees from the M 6.8 in Sulawesi of April 12 and was probably promoted by concentrated stresses associated with that event.

 

O: 13MAY2019 15:31:29  37.6N   21.2E mb=4.5  EMSC   SOUTHERN GREECE              

O: 13MAY2019 21:27:33  37.6N   21.2E mb=4.5  EMSC   SOUTHERN GREECE              

O: 13MAY2019 16:57:17  37.7N   21.2E mb=4.7  EMSC   SOUTHERN GREECE              

O: 13MAY2019 16:57:17  37.7N   21.2E mb=4.9  ANSS   SOUTHERN GREECE              

P: 13MAY2019 115952    38.0N   22.0E 3.0-4.6 AAAAA  No. Greece                 

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Vancouver Island area of Canada. Four such events of M>=4.2 have occurred in the Vancouver area during 2019 to date. The last of these was an M 5.5 on April 22 and today's event is a likely aftershock of that. Forecast 116024 had expected today's earthquake within about 30 km of the epicenter was likely around May 12. Tidal and geomagnetic stresses probably helped promote this event which occurred within minutes of local solar midnight, a prime time for such stresses to maximize.

 

O: 13MAY2019 08:55:28  50.2N  130.1W mb=4.2  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 12MAY2019 116024    49.9N  130.2W 2.8-5.1 AAAAA  Vancouver Island area      

 

Two light shocks occurred near Franklin, North Carolina today. An M 1.8 foreshock in the area was followed about 7 minutes later by an M 2.1. These were not reported felt in the epicentral area. The last earthquake within about 100 km of these events occurred as an M 2.3 on April 29, 2019. Forecast 115945 had expected regional activity in North Carolina was likely around May 13. This epicenter is at 51.4 degrees (node 7) from the M 7.0 in Peru of March 1 and may have been promoted from that event.

 

O: 13MAY2019 09:24:00  35.8N   80.6W Md=2.1  EMSC   NORTH CAROLINA               

O: 13MAY2019 09:24:00  35.8N   80.6W md=2.1  ANSS   Franklin North Carolina

O: 13MAY2019 09:17:22  35.8N   80.6W md=1.8  ANSS   Franklin North Carolina

P: 13MAY2019 115945    37.2N   81.9W 2.0-4.1 ABBAA  Kentucky/Tennessee/NC       

 

STRONG EARTHQUAKE SHAKES COSTA RICA AND PANAMA

 

EARTHQUAKE SUMMARY FOR MAY 12, 2019

 

A strong M 6.2 earthquake hit the Panama-Costa Rica area today. NEIC reported maximum shaking with intensity VIII in Plaza de Caisan, Chiriqui, Panama and Guacimo, Alajuela, Costa Rica; VII in Burica, Panama and VI in Sortova and Puerto Armuelles, Panama; V in Boquete, David, Las Lomas, La Concepcion and San Andres; IV in Volcan Chiriqui, Panama and Golfito Puntarenas, Costa Rica and II-III in Panama and Costa Rica within about 300 km of the epicenter. An aftershock of M 4.5 in Costa Rica was also widely felt. NEIC reported intensity VII in Coast Rica at San Marcos; IV in Santiago, Quepos, and San Rafael, San Jose and II-III in Colon, Atenas, Escazu, San Antonio and Santiago, Costa Rica among other communities within about 100 km of the epicenter. News sources indicate that at least five people were injured in the quake and that wooden porches collapsed in the epicentral area. Items were thrown from store shelves. Walls also cracked in supermarkets and hospitals but no major damage was reported.

 

It is likely that this earthquake was promoted by geomagnetic effects associated with the geomagnetic storm yesterday as it occurred in the region considered most vulnerable to these as reported in the previous issue of this summary:

 

"Current solar flare activity is likely to increase and enhance seismicity along the geomagnetic equator in the next two days. Active conditions in the next two days could bring increased seismicity near the geomagnetic equator and at high latitudes over the next four days.  Today's storm reached maximum KP  mid-day at high latitudes. Areas near 90 W and 90 E near the geomagnetic equator are most likely to be immediately affected." (May 11-12, 2019)

 

The M 6.1 in Panama was the strongest earthquake within about 200 km of that epicenter since an M 6.5 about 200 km northwest of this on November 13, 2017 and prior to that an M 6.6 on December 8, 2014. An M 6.0-6.1 hit in the region on August 17, 2018 and today's event may be a regional aftershock of that earthquake. Forecast 115576 had expected today's activity within about 100 km was likely around May 10.

 

O: 12MAY2019 23:09:30   8.5N   82.8W ML=4.0  EMSC   PANAMA-COSTA RICA BORDER REGIO

O: 12MAY2019 19:24:52   8.6N   82.8W Mw=6.1  EMSC   PANAMA-COSTA RICA BORDER REGIO

P: 10MAY2019 115576     8.0N   82.0W 3.5-5.2 AAAAA  Costa Rica                 

 

The M 4.5 aftershock in Costa Rica occurred about 250 km northwest of the M 6.1 mainshock. Forecast 115612 and 115628 had expected this event was likely in early May.

 

O: 13MAY2019 01:01:54   9.7N   84.3W mb=4.5  EMSC   COSTA RICA                   

P:  5MAY2019 115612    10.0N   84.0W 3.5-5.1 CAAAA  Caribbean Sea              

P: 10MAY2019 115628    10.0N   86.0W 3.5-5.2 BABAA  Nicaragua                  

 

An unusual M 4.6 in the Caribbean Sea preceded the activity in Costa Rica and

Panama. It was not felt in this remote area. No earthquakes of M>=4 have been recorded within about 200 km of this epicenter in the past 30 years. An M 4.0 last occurred within about 350 km on January 22, 2010. The two other such events within this larger distance occurred as an M 4.5 on June 4, 1994 and an M 4.3 on September 26, 1991. This may be a precursor to the Panama M 6.1 later in the day or could have also been promoted by the strong geomagnetic storm yesterday.

 

O: 12MAY2019 08:18:37  15.5N   78.1W mb=4.6  EMSC   CARIBBEAN SEA                

 

The second largest earthquake in the world today was an M 5.4 in the Arctic Ocean east of Severnaya Zemlya, Russia. A series of earthquakes hit about 1000 km northeast of this in late March and an M 4.1 occurred on May 2. The last event in the Severnaya Zemlya area within about 500 km of this epicenter with M>=5.4 however, occurred more than six years ago with an M 5.4 on December 13, 2012. The last of larger magnitude in the region occurred 10 years ago on October 7, 2009 with M 5.7. Forecast 116065 had expected a moderately large earthquake within about 300  km of today's epicenter was likely around May 18. This epicenter is at 102 degrees from the last major global earthquake - the M 7.5 in Ecuador of February 22, 2019 and may have been promoted by that event and the strong geomagnetic storm yesterday. A pair of M 4.1 earthquakes in western Turkey today was also at this distance from Ecuador.

 

O: 13MAY2019 00:43:33  79.4N  124.1E mb=5.4  EMSC   EAST OF SEVERNAYA ZEMLYA     

P: 18MAY2019 116065    82.0N  119.0E 4.0-5.6 BCAAA  Arctic Ocean Region        

 

An earthquake of M 5.4-5.6 also shook the northern Philippines in the Babuyan Islands Region today. NEIC reported this earthquake of M 5.4 in the Babuyan Islands, northern Philippines was felt with intensity VI in Namuac, and San Vicente, Cagayan Valley, Philippines and II-III in the area(s) of Laoag Ilocos, Philippines and in Pingtung County, Taiwan. PHIVOLCS reported it was felt with intensity III in Calayan and Aparri, Cagayan, Philippines. PHIVOLCS reported the M 4.3 was felt with intensity II in Calayan and Claveria, Cagayan, Philippines.

The last earthquake of M>=5.4 within about 150 km of this epicenter occurred as an M 5.5 on May 6, 2019 and an M 5.6 on March 2, 2019. The last of significantly larger magnitude in the area was an M 5.8 on February 17, 2014.  Forecast 115890 had expected today's event within about 100 km was likely around

May 16.

 

O: 12MAY2019 10:00:00  19.3N  121.1E mb=4.8  EMSC   BABUYAN ISL REGION, PHILIPPINE

O: 12MAY2019 08:59:53  19.3N  121.0E MS=5.2  PHI  Felt with intensity III

O: 12MAY2019 10:00:01  19.3N  121.1E MS=4.3  PHI  Felt with intensity II

O: 12MAY2019 08:59:52  19.3N  121.1E mb=5.4  EMSC   BABUYAN ISL REGION, PHILIPPINE

P: 16MAY2019 115890    19.0N  122.0E 3.5-4.9 BAAAA  Luzon, Philippines         

 

An M 4.8 in the northern Mid-Atlantic Ridge today may have been promoted by Tropical Cyclone Ann near the antipode. This summary had noted this possibility as:

 

"Tropical Cyclone Ann (27P) continued today in the area south of New Guinea with winds up to 55 kts. It is expected track to the west over the next several days. Some seismic enhancement in the region of New Guinea and the Solomon Islands is possible at this time. The antipode at 15N 30W is near the northern Mid-Atlantic ridge, an area which may become active as TC Ann moves to the west in the next several days." (May 12, 2019)

 

O: 12MAY2019 21:11:40  14.9N   45.2W mb=4.8  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 13MAY2019 115894    15.0N   46.0W 4.0-5.7 AAAAA  Mid-Atlantic Ridge         

 

MODERATE QUAKES IN IRAN AND KERMADEC ISLANDS

 

EARTHQUAKE SUMMARY FOR MAY 11, 2019

 

Moderate earthquakes of M 5.3-5.4 hit in the Kermadec Islands, New Zealand and on the border between Iran and Iraq today. Neither was reported widely felt in  their respective epicentral areas. The earthquake of M 5.3 on the Iran-Iraq border  is the strongest within about 200 km of that epicenter since an M 5.6 on January 6, 2019 and an M 6.3 on November 25, 2018. This activity began with an M 7.3 on November 12, 2017 and is probably aftershocks of that mainshock.  Forecast 115706 had expected A moderate event in this area around May 8.

 

O: 11MAY2019 10:28:59  34.9N   45.8E mb=5.3  EMSC   IRAN-IRAQ BORDER REGION      

P:  8MAY2019 115706    33.0N   46.0E 3.8-5.2 BBAAA  So. Iran                   

 

The last earthquake of M>=5.4 west of the IDL in the area south of the Kermadec Islands occurred with M 5.4 on April 18, 2015. The last of larger magnitude was an M 6.1 on April 18, 2015. Forecast 115827 had expected today's event was likely within about 100 km of this epicenter around May 9.

 

O: 11MAY2019 16:06:14  34.6S  180.0E Mw=5.4  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  9MAY2019 115827    35.0S  179.0E 3.0-4.5 AAAAA  North Island, N.Z.         

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 off the coast of Northern California and Oregon.  NEIC reported this earthquake of M 4.0 near the coast of Northern California  was felt with intensity II-III in the area(s) of Brookings, Oregon and in Crescent City and Eureka, California.  This is an unusually large quake for the region. The only similar earthquake in the past half year was an M 4.1 on January 4, 2019 and prior to that a series on November 16, 2018 of M 4.5, 4.3 and 4.1. Forecast 115742 had expected this event within about 100 km of the epicenter  was likely around May 10.

 

O: 11MAY2019 22:11:12  41.8N  126.0W mb=4.0  EMSC   OFF COAST OF NORTHERN CALIFORN

O: 11MAY2019 22:44:24  41.9N  125.9W ML=2.5  EMSC   OFF COAST OF NORTHERN CALIFORN

P: 10MAY2019 115742    43.1N  126.5W 3.0-4.8 ABAAA  Off Coast of Oregon        

 

VANUATU M 5.8 MAY HAVE BEEN PROMOTED BY TROPICAL CYCLONE ANN

 

EARTHQUAKE SUMMARY FOR MAY 10, 2019

 

The strongest earthquake in the world today was an M 5.8 in the region of Vanuatu. It was reported by NEIC to have been felt with intensity II-III in We Iles and Tadine, New Caledonia and in Vila Shefa, Vanuatu. This event occurred as a new Tropical Cyclone - Ann was forming to the west of this epicenter. This summary had noted this cyclone as:

 

"Tropical Cyclone Ann (27P)  formed today in the area west of Vanuatu with winds up to 50 kts. It is expected track to the west over the next several days. Some seismic enhancement in the region of Vanuatu and the Solomon Islands is possible at this time. The M 5.8 in Vanuatu today may have been promoted by stresses from TC Ann." (May 10-11, 2019)

 

This epicenter is also near the geomagnetic equator and recent solar flares and a likely geomagnetic storm may have helped promote this at this time. This is the strongest earthquake in southern Vanuatu within about 150 km of this epicenter since an M 6.0 on January 18, 2019 and prior to that an M 6.4 on July 13, 2018. Forecast 115820 had expected this event within about 25 km was likely around May 11.

 

O: 10MAY2019 08:44:55  19.7S  169.1E Mw=5.8  EMSC   VANUATU                       

P: 11MAY2019 115820    20.0S  169.0E 4.0-5.6 AAAAA  Vanuatu Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 south of Anchorage in the Kenai Peninsula, Alaska.  NEIC reported this earthquake of M 4.2-4.4 in the Kenai Peninsula, Alaska was felt with intensity II-III in the area(s) of Soldotna, Sterling, Ninilchik, Anchor Point, Homer, Moose Pass, Seward and Anchorage, Alaska. This is the strongest earthquake in the Kenai Peninsula in the past half year - an M 4.3-4.4 hit the area on January 9, 2019. The last event of larger magnitude within about 150 km of this epicenter occurred as an M 4.4 on November 17, 2017 and prior to that an M 5.1 on November 5, 2017. Forecast 115779 had expected today's event within about 25 km of this epicenter was likely around May 8.

 

O: 10MAY2019 23:52:45  60.3N  150.9W mb=4.4  EMSC   KENAI PENINSULA, ALASKA      

P:  8MAY2019 115779    60.5N  150.9W 3.2-4.9 AAAAA  Central Alaska             

 

An earthquake of M 3.6 hit the Nevada region north of the California border today. NEIC reported this earthquake of M 3.6 in Nevada was felt with intensity II-III in the area(s) of Luning, Nevada. This is the strongest earthquake within about 50 km of this epicenter since an 4.0 on August 12, 2017 and prior to that a series to the west in January, 2017 of M 3.6-4.0. This appears to continue regional seismic activation of the California-Nevada area which began about a week ago. Forecast 115666 had expected today's activity was likely around May 8 in this area.

 

A series of earthquakes of M 3.5-4.1 also occurred today in the northern Gulf of California and in Sonora, Mexico. This is an active area and often becomes active with strong solar flare or geomagnetic activity such as has been occurring over the past several days.

 

O: 10MAY2019 13:54:03  38.4N  118.2W ml=2.7  EMSC   NEVADA                       

O: 10MAY2019 12:58:56  38.4N  118.2W ml=3.6  EMSC   NEVADA                       

P:  8MAY2019 115666    38.6N  118.6W 2.5-4.4 AAAAA  California/Nevada area     

 

O: 10MAY2019 19:47:53  31.0N  110.3W ML=3.6  EMSC   SONORA, MEXICO               

O: 10MAY2019 19:46:38  31.1N  110.3W ML=3.7  EMSC   SONORA, MEXICO               

P:  4MAY2019 115695    30.2N  114.1W 2.0-4.2 CACAA  SW U.S.A                    

 

The last activity of moderate magnitude (M>=4) in the northern Gulf of California near today's swarm occurred on April 6, 2019 about 100 km to the southeast with M 5.2. The last such event within 100 km of today's epicenter was an M 4.5 on July 28, 2018, NEIC reported these earthquakes of M 4.1 in the Northern Gulf of California were felt with intensity II-III in the area(s) of San Felipe, Baja California, Mexico. Forecast 115695 had expected the area would be active in early May. Like the events in Sonora, Mexico these earthquakes in the Gulf of California are located at 101-104 degrees from the M 7.2 in New Guinea which occurred May 6. This is a distance at which concentrated energy from large earthquakes can help promote subsequent seismicity and this appears to be the case in  this instance.

 

O: 10MAY2019 19:28:40  31.4N  114.5W ML=4.0  EMSC   GULF OF CALIFORNIA           

O: 11MAY2019 06:32:42  31.4N  114.5W ML=4.1  EMSC   GULF OF CALIFORNIA           

O: 10MAY2019 20:07:53  31.4N  114.6W ML=4.1  EMSC   GULF OF CALIFORNIA           

O: 10MAY2019 20:03:29  31.5N  114.5W ML=3.1  EMSC   GULF OF CALIFORNIA           

O: 10MAY2019 17:05:45  31.5N  114.5W mb=4.1  EMSC   GULF OF CALIFORNIA           

O: 10MAY2019 18:14:23  31.5N  114.6W ML=3.0  EMSC   GULF OF CALIFORNIA           

O: 10MAY2019 17:21:09  31.6N  114.5W ML=3.4  EMSC   GULF OF CALIFORNIA           

P:  4MAY2019 115695    30.2N  114.1W 2.0-4.2 CBAAA  SW U.S.A                   

 

 

Light earthquakes of M 2.4-2.5 were felt in Tennessee and Kentucky today but the most unusual event in the U.S. was an M 3.0 in Southern Texas. NEIC reported this earthquake of M 3.0 in Southern Texas was felt with intensity II-III in the area(s) of Gillett and Austin, Texas. This is the strongest earthquake in southern Texas within about 150 km of this epicenter since an M 3.0 on February 3, 2019 and prior to that an M 3.2 on December 22, 2018. This area became active following extensive flooding from tropical storms and appears to be increasing in seismicity - perhaps triggered by fault lubrication by water. A strong storm occurred near this epicenter today and may have provoked today's event.

Forecast 115651 had expected it within this region likely around May 8,

 

O: 10MAY2019 16:49:30  29.1N   97.9W mb=3.0  EMSC   SOUTHERN TEXAS               

P:  8MAY2019 115651    28.0N   97.0W 3.0-4.7 ABAAA  Northern Mexico            

 

STRONG M 6.1 SHAKES KYUSHU, JAPAN

 

EARTHQUAKE SUMMARY FOR MAY 9, 2019

 

A set of moderately strong to strong earthquakes occurred today. These events

of M 6.1-6.3 in Kyushu, Japan; and the Kermadec Islands (M 5.8) appear to have been promoted by a combination of stresses related to the recent new moon and solar flare activity. This summary had expected this activity at this time due to the tidal effects of the new moon as:

 

 

"The new moon arrived on May 4 at 22:45 UT. Areas which are sub-solar at this time are near the longitude 160 West while those antisolar regions are near  20 East Longitude. These include western Europe and the East African Rift in the East and Hawaii, the Tonga-Kermadec arc and the Aleutians and portions of western Alaska in the West. These are areas where high tidal stresses are most likely to help promote enhanced seismicity at this time until about May 6-7. Other areas of the world may also see seismic enhancement in the next week however, also due to high astronomical tides." (May 2-7, 2019)

 

and due to the solar flares as:

 

"Solar flare activity today included a C9.9 and a C7.3 flare, the strongest recorded in the current year. The second of these occurred while New Guinea was directly anti-solar and probably helped promote the later M 7.2 in that area today. This flare activity is likely to increase and enhance seismicity along the geomagnetic equator in the next five days." (May 6-7, 2019)

 

A C6.7 solar flare, the third largest of the year, also occurred today. Parameters for this event are:

 

 

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

 

3970       0540   0551      0556   C6.7      (May 9, 2019)   3.3E-03  

 

The most likely earthquake triggered by this flare was an M 3.8 in Baja California 20 minutes later, but an M 4.3 in Northern Alaska may also have been promoted by effects from this flare (see previous issue).

 

The strongest earthquake felt in the world today was an M 6.1-6.3 in Kyushu, Japan. It was preceded by an M 5.5 foreshock. NEIC reported maximum intensity VI in Miyazaki, Japan with V in Miyakonojo and IV in Hyuga and Hiji, Oita, Japan. Intensity II-III was felt in Kagoshima, Taketa, Kumamoto, Makurazaki, Oita and Beppu, Japan. JMA reported intensity V in Miyazaki; IV in Kumamoto, Oita, Kagoshima; and III in Hiroshima, Ehime, Fukuoka, Nagasaki, Japan. The M 5.5 foreshock was felt with intensity IV in Miyazaki and II-III in Kiyotake, Fukuoka and Iwakuni, Yamaguchi, Japan. No major damage occurred in either earthquake and a tsunami warning was not issued. The only other such event in the region of Kyushu within about 200 km of today's epicenter in the past three years was an M 6.3 on January 8, 2019. An M 7.0 hit the region on April 15, 2016 after a foreshock the day before of M 6.2. Further earthquakes in the area can be expected in the next several days.  Forecast 115681 had expected today's event within about 50 km was likely around May 9.

 

O: 10MAY2019 04:53:47  31.3N  131.7E mb=4.6  EMSC   KYUSHU, JAPAN

O: 10MAY2019 00:07:38  31.8N  131.7E mb=5.1  EMSC   KYUSHU, JAPAN

O: 09MAY2019 22:43:23  31.8N  131.8E Mw=5.6  EMSC   KYUSHU, JAPAN

O:  9MAY2019 23:48:41  31.9N  131.6E Mw=6.1  EMSC   KYUSHU, JAPAN                

P:  9MAY2019 115681    32.0N  132.0E 3.5-5.3 AAAAA  Kyushu, Japan area         

 

 

Tidally promoted seismicity in the Tonga-Kermadec area occurred as an M 5.8 in the Kermadec Islands, New Zealand. It was not reported felt. This is the strongest earthquake within about 150 km of this epicenter in the Kermadec Islands since an M 5.8 on July 2, 2017. The last of larger magnitude was an

M 6.3 on July 13, 2016. Forecast 115812 had expected today's event was likely within this area around May 9.

 

O: 10MAY2019 03:23:32  28.8S  176.7W Mw=5.8  EMSC   KERMADEC ISLANDS REGION      

P:  9MAY2019 115812    28.0S  177.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

The largest earthquake in the U.S. or Canada also occurred in the Andreanof Islands of Alaska with M 4.1 and an aftershock of M 3.8. These were not felt and were also probably promoted by strong tidal stresses. Forecast 115758 had expected this activity around May 11.

 

O: 10MAY2019 02:08:58  51.5N  175.3W mb=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 10MAY2019 02:14:16  51.7N  175.4W mb=3.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 11MAY2019 115758    52.1N  174.4W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

An earthquake of M 4.1 also occurred south of Alaska today but was not felt. This is the strongest earthquake in the region within about 200 km of this epicenter since an M 4.2 on September 5, 2017. Forecast 115781 had expected regional activity around May 9.

 

O:  9MAY2019 09:36:45  54.0N  153.3W mb=4.1  EMSC   SOUTH OF ALASKA              

P:  9MAY2019 115781    55.3N  150.5W 3.2-4.9 ABBAA  Central Alaska             

 

ENHANCED SEISMICITY CONTINUES ON GEOMAGNETIC EQUATOR

 

EARTHQUAKE SUMMARY FOR MAY 8, 2019

 

The strongest earthquake in the world today was an M 5.8 off the coast of southern Peru. NEIC reported it was felt with intensity VI in Marcona, Ica and II-III in Puquio, Ayacucho and San Luis, Lima, Peru. IGP reported the M 5.8 was felt with intensity III-IV  Lomas, Yauca, Acari, Peru. The M 5.8 was followed by two moderate aftershocks of M 4.4 each. IGP reported the later M 4.4 was felt with intensity II in  Chala, Yauca, Atico, Peru. IGP reported the first M 4.4 was felt with intensity II in  Lomas, Peru. This epicenter is located on the geomagnetic equator and was probably part of the enhanced seismicity associated with the strong solar flares of the past several days. This had been  anticipated in previous issues of this summary, as for example in the last:

 

"Current solar flare activity is likely to increase and enhance seismicity along the geomagnetic equator in the next three days." (May 7-8, 2019)

 

The earthquake off southern Peru of M 5.8 was most likely promoted by the series of C-class solar flares over the past three days as it occurred near local solar noon and on the geomagnetic equator. It is the strongest earthquake within about

200 km of this offshore epicenter since an M 7.1 more than a year ago on January 14, 2018 and prior to that an M 6.9 on August 24, 2014. Forecast 115795 had expected this event in this area was likely around May 7.

 

O:  8MAY2019 13:47:19  15.8S   75.1W Mw=5.8  EMSC   NEAR COAST OF CENTRAL PERU   

O:  8MAY2019 18:21:00  15.9S   75.1W ML=4.4  EMSC   NEAR COAST OF CENTRAL PERU   

O:  9MAY2019 04:10     16.0S   74.1W mb=4.4  GUC    Chala, Yauca, Atico, Peru.   

O:  8MAY2019 13:47     15.9S   75.1W mb=4.4  GUC    Lomas, Peru.                  

O:  8MAY2019 18:21     15.9S   75.1W mb=5.8  GUC    Lomas, Yauca, Acari, Peru.   

P:  7MAY2019 115795    15.0S   76.0W 4.0-5.4 AAAAA  Central Peru               

P:  7MAY2019 115795    15.0S   76.0W 4.0-5.4 AAAAA  Central Peru                

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in the aftershock zone of northwestern Alaska. An M 4.3 last hit the area as an M 4.5 on April 23 and an M 4.7 on April 16 and prior to that in March following a  moderate M 5.2 on March 26, 2019. Forecast 115780 had expected today's event was likely within about 50 km of this epicenter around May 7.

 

O:  9MAY2019 05:42:07  66.3N  157.2W ML=3.1  EMSC   NORTHERN ALASKA              

O:  9MAY2019 05:29:59  66.3N  157.4W Mw=4.3  EMSC   NORTHERN ALASKA              

P:  7MAY2019 115780    66.3N  156.5W 3.2-4.9 AAAAA  Central Alaska             

 

A series of minor earthquakes in the Banda Sea of M 4.2 each may have been promoted by a potential tropical cyclone in the region. These epicenters lie directly under the eye of this storm. This seismicity had been expected in this summary as:

 

"A tropical cyclone may be forming in the Banda Sea. This system is currently located at 7S 129E and moving South at 5 kts with winds up to 33 kts. Some seismic enhancement in the region of Central Indonesia and the Banda Sea is likely with this storm." (May 5-8, 2019)

 

O:  8MAY2019 17:54:58   6.0S  130.7E ML=4.2  EMSC   BANDA SEA                    

O:  9MAY2019 03:37:03   6.3S  130.3E ML=4.2  EMSC   BANDA SEA                    

P:  6MAY2019 115585     8.0S  129.0E 4.0-5.4 BBAAA  Banda Sea                  

 

QUIET CONDITIONS RESUME

 

EARTHQUAKE SUMMARY FOR MAY 7, 2019

 

Global seismicity was at quiet levels today after strong seismicity and solar flare activity occurred yesterday. This quiet should not last more than two days at which time geomagnetic effects should promote stronger global seismicity again. There were no events of M>=5 located in the world today. Moderate activity were felt in the Philippines and in Indonesia and India. The most widely felt of these occurred in Samar, Philippines with M 4.6 but a similar event also was felt in the Andaman and Nicobar Islands, India.

 

The earthquake in the Andaman Islands is the strongest within about 200 km

of that epicenter since an M 4.9 on March 20, 2019 and prior to that an M 5.5 on August 24, 2018. Forecast 115609 had expected this event within about 50 km was likely around May 7.

 

O:  7MAY2019 08:24:12  10.7N   93.5E mb=4.6  EMSC   ANDAMAN ISLANDS, INDIA REGION

P:  7MAY2019 115609    11.0N   93.0E 4.0-5.4 AAAAA  Andaman Islands            

 

PHIVOLCS reported the M 4.6-4.7 in Samar was felt with intensity IV in San Julian, Maydolong and Borongan City, Eastern Samar; III in Gen. MacArthur, Eastern Samar; Catbalogan City, Samar, and II in Lawaan, Eastern Samar, Tacloban City. This is an aftershock of the M 5.4 in Eastern Samar of April 23, 2019.

NEIC reported this earthquake of M 4.6 in Central Philippins  was felt with intensity II-III in the area(s) of the eastern Visayas, Philippines at Maypangdan and San Antonio. Forecast 115621 had expected this event about 150 km to the northeast was likely around May 8.

 

O:  8MAY2019 03:01:07  11.7N  125.6E mb=4.6  EMSC   SAMAR, PHILIPPINES           

O: 08MAY2019 03:00:59  11.7N  125.8E MS=4.7  PHI  Felt with intensity IV

P:  8MAY2019 115621    13.0N  126.0E 3.5-5.0 ABAAA  Luzon, Philippines         

 

A light aftershock of M 3.8 was widely felt in the Anchorage Alaska aftershock zone today. NEIC reported intensity II-III in Wasilla, Elmendorf AFB, Anchorage, Fort Richardson, Chugiak, Eagle River, Talkeetna and Tyonek, Alaska. This is the strongest aftershock in the Anchorage area within about 100 km of this epicenter since an M 4.0 on March 23, 2019. Forecast 115779 had expected today's event was likely around May 8.

 

O:  7MAY2019 21:46:35  61.4N  149.9W ML=3.8  EMSC   SOUTHERN ALASKA              

P:  8MAY2019 115779    60.5N  150.9W 3.2-4.9 AAAAA  Central Alaska             

 

STRONGEST SOLAR FLARES OF YEAR TRIGGER STRONGEST EARTHQUAKE SINCE FEBRUARY

 

EARTHQUAKE SUMMARY FOR MAY 6, 2019

 

A major earthquake of M 7.2 hit the region of eastern New Guinea today. NEIC reported maximum intensity VII in Papua New Guinea at Wau Morobe and VI in Bulolo, Lae, Kainantu and Goroka,  Eastern Highlands, and V in Mount Hagen, Western Highlands, PNG and lesser shaking within about 300 km of the epicenter including at Lalibu, Madang, Kundiawa and Kerema, PNG. This is the largest earthquake in the world since an M 7.5 in Ecuador on February 22, 2019 and one of only two such events during the year 2019. It occurred at an intermediate depth of 141 km reducing surface effects. The M 7.2 is the strongest earthquake within about 200 km of this epicenter in at least 30 years although an M 7.2  on May 15, 1992 and a similar M 7.2 on December 22, 1997 occurred just outside this distance range. The last in the 200 km range was an M 7.6 on February 8, 1987. Similar events occurred in February 1963; February, 1951; January, 1946; May, 1938 and February, 2007.

 

This event in New Guinea was probably promoted by a pair of strong C-class solar flares. This summary had noted these as:

 

"Solar flare activity today included a C9.9 and a C7.3 flare, the strongest recorded in the current year. The second of these occurred while New Guinea was directly anti-solar and probably helped promote the later M 7.2 in that area today. This flare activity is likely to increase and enhance seismicity along the geomagnetic equator in the next five days." (May 6-7, 2019)

 

In the previous summary strong activity near the geomagnetic equator had been expected at this time as:

 

"The combination of tidal and geomagnetic stresses is likely to encourage

a major event in the next several days - most likely along the geomagnetic

equator in the Philippines or Indonesia." (May 5-6, 2019)

 

and

 

"An earthquake of M 5.3 was also felt lightly in the Papua New Guinea area today. This is located on the geomagnetic equator and may have been promoted by the current geomagnetic storm. Further enhanced seismicity in this region is likely in the next several days." (May 5-6. 2019)

 

Solar Flare Data:

 

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

#-------------------------------------------------------------------------------

 

3070       0504   0510      0512   C9.9      (May 6, 2019)   2.0E-03  

3290       1335   1354      1357   C7.3      (May 6, 2019)   2.5E-03  

 

Note that the C7.3 occurred within about 15 minutes of local solar midnight at the location of the M 7.2 in New Guinea and probably helped promote that earthquake.

 

Forecast 115594 had expected today's event within about 100 km was likely  around May 6.

 

O:  6MAY2019 21:19:36   7.0S  146.5E Mw=7.2  EMSC   EASTERN NEW GUINEA REG., P.N.G

O: 06MAY2019 21:19:35   7.0S  146.4E mw=7.2  ANSS   Bulolo Papua New Guinea

P:  6MAY2019 115594     6.0S  146.0E 4.0-5.6 AAAAA  New Ireland                

 

An earthquake of M 5.5 in the Bougainville Region, (east of the PNG 7.2 later)  PNG also occurred today within minutes of local solar midnight and was likely triggered by the C7.3 solar flare (#3290) as it occurred about 15 minutes after that flare at an epicenter which was almost exactly antisolar at the time of the flare. Forecast 115604 had expected this event was likely within about 100 km around May 8. This is the strongest earthquake within about 150 km of this epicenter since an M 5.8 on August 22, 2018.

 

O:  6MAY2019 14:13:48   6.2S  154.8E mb=5.5  EMSC   BOUGAINVILLE REGION, P.N.G.  

P:  8MAY2019 115604     7.0S  155.0E 4.0-5.4 AAAAA  Solomon Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Andreanof Islands, Aleutians. It was not reported felt in this remote region. It occurred within about an hour of local solar noon and was probably promoted by tidal stresses associated with the new moon as noted in the tidal forecast in previous issues of this summary:

 

"The new moon arrived on May 4 at 22:45 UT. Areas which are sub-solar at this time are near the longitude 160 West while those antisolar regions are near  20 East Longitude. These include western Europe and the East African Rift in the East and Hawaii, the Tonga-Kermadec arc and the Aleutians and portions of western Alaska in the West. These are areas where high tidal stresses are most likely to help promote enhanced seismicity at this time until about May 6-7. Other areas of the world may also see seismic enhancement in the next week however, also due to high astronomical tides." (May 2-5, 2019)

 

Forecast 115757 had expected this event within about 50 km of the epicenter was likely around May 8. The last earthquake in the western Andreanof Islands with M>=4.4 was an M 4.8 on March 22, 2019.

 

O:  6MAY2019 22:37:57  51.3N  178.4W mb=4.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  8MAY2019 115757    51.8N  178.0W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

An earthquake of M 3.9 was also felt lightly today in the region of Northern Nevada. NEIC reported this earthquake of M 3.9 in Northern Nevada was felt with intensity II-III in the area(s) of Fallon, Fernley and possibly Glenbrook, Nevada. The last earthquake within about 75 km of this epicenter in northern Nevada with M>=3.9 was an M 3.9 on January 2, 2014 and a similar event of M 3.9 on September 28, 2011. The last of larger magnitude in this area was an M 4.2 on January 23, 2003. Forecast 115719 had expected this event within about 50 km of this epicenter was likely around May 6.

 

O:  6MAY2019 20:21:58  39.7N  117.5W ml=2.2  EMSC   NEVADA                       

O:  7MAY2019 04:58:38  39.8N  117.5W ml=3.9  EMSC   NEVADA                       

P:  6MAY2019 115719    40.2N  117.6W 2.5-4.4 AAAAA  California/Nevada area     

 

An unusual earthquake in the Bay of Bengal occurred with M 4.9 today east of India. This is the largest earthquake within about 200 km of this epicenter in the past  30 years. An M 5.9 occurred west of this on May 21, 2014 with other such regional events outside this distance on October 13, 2001 (M 5.2) and May 30, 2006 (M 4.9). Today's earthquake was not reported felt in this oceanic area. It was probably promoted by Tropical Cyclone Fani which passed over this epicenter several days ago as noted in this summary at the time:

 

"Tropical Cyclone Fani (01B) continued today along the Indian Peninsula with winds up to 85 kts. It is expected to track to the north over then next several days. Some seismic enhancement in the Sumatra, Indonesia region may  occur with this storm." (May 1-4, 2019)

 

Since that time regional activation in Northern India has included significant activity in Assam, India. Forecast 115610 had expected today's event was likely in early May within about 150 km of today's epicenter.

 

O:  6MAY2019 14:18:25  19.7N   90.9E mb=4.9  EMSC   BAY OF BENGAL                 

P: 11MAY2019 115610    19.0N   92.0E 4.0-5.6 BAAAA  Andaman Islands            

 

SEISMIC ENHANCEMENT CONTINUES IN LUZON, PHILIPPINES

 

EARTHQUAKE SUMMARY FOR MAY 5, 2019

 

Enhanced seismicity continued in Luzon, Philippines today with an M 5.5 in the northern areas. This may have been promoted by the new moon tidal stresses as well as a moderate geomagnetic storm, the strongest in nearly a month.

 

"The geomagnetic field saw disturbed conditions today. The AP level was 10. High latitude geomagnetic field also saw disturbed conditions  with AP at 22." (May 4-5, 2019)

 

and the tidal forecast:

 

"The new moon arrived on May 4 at 22:45 UT. Areas which are sub-solar at this time are near the longitude 160 West while those antisolar regions are near  20 East Longitude. These include western Europe and the East African Rift in the East and Hawaii, the Tonga-Kermadec arc and the Aleutians and portions of western Alaska in the West. These are areas where high tidal stresses are most likely to help promote enhanced seismicity at this time until about May 6-7. Other areas of the world may also see seismic enhancement in the next week however, also due to high astronomical tides." (May 2-5, 2019)

 

The combination of tidal and geomagnetic stresses is likely to encourage a major event in the next several days - most likely along the geomagnetic equator in the Philippines or Indonesia.

 

An earthquake of M 5.5 occurred today in northern Luzon, Philippines. NEIC reported it was felt with intensity IV in Cagayan at Santa Maria and Awallan and II-III in Tuguegarao and in Ilocos at Banta and in Baguio, Crdillera, Philippines. PHIVOLCS reported it was felt with Intensity V - Pagudpud, Pasuquin, Bacarra, Adams, Dumalneg, Bangui, Burgos, Vintar & Laoag City, Ilocos Norte; Claveria & Tuguegarao City, Cagayan Intensity IV - Paoay, Ilocos Norte; Aparri, Ballesteros, Gonzaga, Allacapan, Enrile, Solana & Sanchez-Mira, Cagayan Intensity III - Sinait, Santa, San Vicente, Cabugao, San Juan, Magsingal, Sto. Domingo, Bantay & Vigan City, Ilocos Sur; Lasam, Piat & Pe¤ablanca, Cagayan; Flora & Luna, Apayao; Sudipen, La Union; Lacub & Bangued, Abra; Badoc, Pinili & Currimao, Ilocos Norte; Intensity II - Baguio City; Nueva Era, Ilocos Norte;, Philippines. The last earthquake within about 150 km of this epicenter with M>=5.5 occurred on March 2, 2019 and an M 5.5 on January 24, 2019. Prior to that it had been since March 12, 2016 (M 5.6) that the area had seen such an event.  forecast 115623 had expected today's event in this area was likely around May 8.

 

O:  6MAY2019 02:48:43  18.6N  121.1E Mw=5.5  EMSC   LUZON, PHILIPPINES            

O: 06MAY2019 02:48:42  18.7N  120.8E MS=5.4  PHI  Felt with Intensity V

P:  8MAY2019 115623    18.0N  120.0E 3.5-4.9 AAAAA  Luzon, Philippines         

 

An earthquake of M 5.3 was also felt lightly in the Papua New Guinea area today. This is located on the geomagnetic equator and may have been promoted by the current geomagnetic storm. Further enhanced seismicity in this region is likely in the next several days. The last event within about 150 km of this epicenter with M>=5.3 was an M 5.9 on March 4, 2019. The only other such event in the area in the past two years was an M 5.3 on November 25, 2018.  Forecast 115594 had expected this earthquake was likely within about 50 km  of the epicenter around May 6.

 

O:  5MAY2019 08:42:49   6.3S  145.8E mb=5.3  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P:  6MAY2019 115594     6.0S  146.0E 4.0-5.6 AAAAA  New Ireland                

 

A series of light earthquakes occurred today in Southern Idaho. The largest of these was an M 3.1 but this series may expand to greater magnitudes. It may have been promoted by strong tidal stresses. Similar activity occurred with the previous new moon on April 4, 2019 (M 3.2, 3.3) and prior to that on December 26, 2018. Forecast 115479 had anticipated regional activity in early May.

 

O: 05MAY2019 22:20:05  42.7N  111.5W ML=2.4  EMSC   SOUTHERN IDAHO

O: 05MAY2019 15:55:28  42.7N  111.5W ML=2.7  EMSC   SOUTHERN IDAHO

O: 05MAY2019 14:53:59  42.7N  111.5W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 05MAY2019 15:25:32  42.7N  111.5W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 05MAY2019 15:49:35  42.7N  111.5W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 05MAY2019 16:12:14  42.7N  111.5W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 05MAY2019 18:35:42  42.7N  111.5W Ml=2.2  EMSC   SOUTHERN IDAHO

O: 05MAY2019 15:22:49  42.7N  111.5W Ml=2.4  EMSC   SOUTHERN IDAHO

O: 05MAY2019 16:38:59  42.7N  111.5W Ml=3.1  EMSC   SOUTHERN IDAHO

O:  5MAY2019 20:16:55  42.7N  111.5W MD=2.0  EMSC   SOUTHERN IDAHO               

P:  1MAY2019 115479    44.6N  110.8W 2.0-3.9 BBAAA  Yellowstone/Wyoming        

 

M 4.8 OFF COAST OF NORTHERN CALIFORNIA CONTINUES REGIONAL ENHANCEMENT

 

EARTHQUAKE SUMMARY FOR MAY 4, 2019

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 off the coast of Northern California. It was followed by a series of moderate to light aftershocks. The mainshock was probably felt lightly on the coast of Northern California near Eureka. This is the strongest earthquake in this region within about 150 km of this epicenter since an M 5.6 on July 24, 2018 about 150 km northeast of today's epicenter. The last such event within about 100 km of this epicenter occurred as an M 4.9 on January 30, 2016. Forecasts 115740 and 115466 had expected activity within about 50 km of this epicenter was likely in late April or early May. This appears to be part of the regional activation of California which this summary has followed over the past several days. This activity is located at 105 degrees from the Sulawesi earthquake of April 12, 2019 (M 6.8) and was probably promoted by energy from that source.

 

O:  5MAY2019 04:17:19  40.5N  127.8W ML=3.1  EMSC   OFF COAST OF NORTHERN CALIFORN

O:  5MAY2019 06:29:34  40.6N  127.3W ML=3.3  EMSC   OFF COAST OF NORTHERN CALIFORN

O:  5MAY2019 06:32:08  40.6N  127.8W mb=4.3  EMSC   OFF COAST OF NORTHERN CALIFORN

O:  5MAY2019 06:46:57  40.7N  127.4W mb=4.8  EMSC   OFF COAST OF NORTHERN CALIFORN

P:  3MAY2019 115740    40.3N  127.2W 2.5-4.4 AAAAA  Off Coast of No. Calif     

P:  5MAY2019 115740    40.4N  127.2W 2.5-4.4 AAAAA  Off Coast of No. Calif     

P: 26APR2019 115466    42.1N  126.9W 3.0-4.8 CBAAA  Off Coast of Oregon        

 

An earthquake of M 5.1 in northern India today may have been promoted by

Tropical Cyclone Fani which was in the area of this epicenter when the earthquake occurred. This summary had previously noted Fani as:

 

"Tropical Cyclone Fani (01B) continud today along the Indian Peninsula with winds up to 85 kts. It is expected to track to the north over then next several days. Some seismic enhancement in the Sumatra, Indonesia region may  occur with this storm." (May 1-4, 2019)

 

NEIC reported today's earthquake in northern India, Assam, was felt with maximum intensity IV in Tinsukia, Dum Duma and Dibrugarh and II-III in Mokokchung, Nagaland and in Assam at Naharktia, Delia Gaon, Sibsagar, Makum, Jorhat and Golaghat, India. This is the strongest earthquake within about 150 km of this epicenter on the Myanmar-India Border since an M 5.3 on April 4, 2019 with the last new moon. The only other such event in the area in the past year was an M 5.2 on June 2, 2018.  Forecast 115372 had expected this event within this area was likely at the end of April.

 

O:  4MAY2019 11:04:02  26.2N   95.9E Mw=5.1  EMSC   MYANMAR-INDIA BORDER REGION  

P: 26APR2019 115372    27.0N   97.0E 4.0-5.4 CAAAA  Myanmar                     

 

The strongest earthquake in the world today was an M 5.7 in the Celebes Sea, Indonesia. It was not reported felt in this remote oceanic area. The last earthquake of M>=5.7 in the Celebes Sea within about 150 km of this epicenter occurred as an M 5.8 16 years ago on January 17, 2003. Similar activity of M>=5.7 in the past 12 years has consistently occurred south of today's epicenter at shallower depth. The depth of today's event at 339 km is the deepest in the region with M>=5.7 since an M 6.0 on September 4, 2005 (443 km). That event occurred about 200 km northwest of today's epicenter.  Forecast 115295 had expected today's activity at the beginning of May to the southwest

of today's epicenter.

 

O:  4MAY2019 21:02:12   2.0N  123.7E Mw=5.7  EMSC   CELEBES SEA                  

P:  1MAY2019 115295     1.0N  120.0E 4.0-5.4 BACAA  Celebes Sea                

 

STRONG EARTHQUAKE EAST OF SOLOMON ISLANDS; ENHANCED EVENTS IN PHILIPPINES CONTINUE

 

EARTHQUAKE SUMMARY FOR MAY 3, 2019

 

The strongest earthquake in the world today was an M 6.1 in the Solomon Islands. NEIC reported it was felt in the Solomon Islands at Auki Amlaita, Honiara, Guadalcanal and Gizo, Western Solomon Islands. Most strong activity in this region occurs to the south or west of today's epicenter. The last event of M>=6.1 within about 200 km of today's epicenter occurred more than 14 years ago on January 22, 2005. One other such event has hit in this area in the past 30 years - an M 6.2 on November 25, 1998. Forecast 115330 had expected today's activity to the west around May 1.

 

O:  3MAY2019 07:25:28   6.9S  160.1E Mw=6.1  EMSC   SOLOMON ISLANDS              

P:  1MAY2019 115330     8.0S  155.0E 4.0-5.4 ABCAA  Solomon Islands            

 

An earthquake of M 5.7 occurred in Mindoro, Philippines today. NEIC reported maximum intensity V in Pinamalayan and Bagong Sikat, Southern Talog and IV in Malitog with II-III in the Southern Tagalog area at Coron, Salvacion, Balabag, Sabang, Philippines.  PHI reported this earthquake was felt with intensity V in Rizal and San Jose, Occidental Mindoro; Calapan, Oriental Mindoro; IV in Abra de Ilog, Occidental Mindoro; III in Lipa City, Batangas; Malay, Nabas and Ibajay, Aklan; Libertad Antique, Puerto Galera, Oriental Mindoro and II in El Nido, Palawan, San Nicolas, Batangas, City of Manila, Philippines.

The last earthquake of M>=5.7 in Mindoro within about 200 km of today's epicenter was an M 6.2 on August 11, 2017. Forecast 115346 had expected today's activity to the east at the end of April.

 

O:  4MAY2019 01:05:13  12.4N  121.0E Mw=5.7  EMSC   MINDORO, PHILIPPINES         

O: 04MAY2019 01:05:08  12.3N  120.8E MS=5.5  PHI  Felt with intensity V

P: 26APR2019 115346    12.0N  124.0E 3.5-4.9 CACAA  Luzon, Philippines         

 

An unusually strong series of events occurred today in the Southern East Pacific Rise. The strongest of these was an M 5.5. The series began with an M 5.1 within about an hour of local solar midnight and was probably promoted by strong tidal stresses associated with the new moon which arrived today. The last earthquake within about 200 km of this epicenter with M>=5.5 was an M 5.6 on August 28, 2011. The last within about 300 km was an M 5.5 on January 23, 2016 and an M 6.0 about 400 km to the east a year ago on May 2, 2018. Forecast 115544 had expected today's event in this area was likely at the end or April or in early May.

 

O: 03MAY2019 06:55:26  24.3S  116.0W mb=5.1  EMSC   SOUTHERN EAST PACIFIC RISE

O: 04MAY2019 00:07:50  24.5S  115.9W Mw=5.5  EMSC   SOUTHERN EAST PACIFIC RISE

O:  4MAY2019 04:33:42  24.2S  115.9W mb=5.0  EMSC   SOUTHERN EAST PACIFIC RISE    

P: 30APR2019 115544    25.0S  112.0W 4.0-5.7 BABAA  So. East Pacific Rise      

 

The strongest seismicity in the U.S. or Canada today continued in the northern Alaska aftershock zone with an M 4.1 and four other events of M>=3. On May 2, this summary reported in this regard:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.6 in the aftershock zone in northwestern Alaska. It was not reported felt in this remote area. This is northeast of the strong swarm which has hit the region about 150 km southwest of this epicenter since February 2019 and does not appear to be an aftershock in that area. An M 5.3 did occur about 50 km from this epicenter on October 14, 2018, the only such event within about 100 km of this epicenter since an M 4.6 on August 13, 1993. Forecast 115483 had expected today's epicenter would be active at the end of April. This earthquake is located at 102 degrees from the M 7.0 in Peru of March 1, 2019 and may have been promoted from that event." (May 2, 2019)

 

 

O: 03MAY2019 11:55:53  66.2N  157.2W ml=3.2  EMSC   NORTHERN ALASKA

O: 03MAY2019 12:09:56  66.2N  157.3W ML=3.0  EMSC   NORTHERN ALASKA

O: 03MAY2019 13:32:34  66.2N  157.3W ml=3.0  EMSC   NORTHERN ALASKA

O: 03MAY2019 11:57:11  66.3N  157.2W ml=3.0  EMSC   NORTHERN ALASKA

O:  3MAY2019 11:52:25  66.2N  157.2W ML=4.1  EMSC   NORTHERN ALASKA              

P: 24APR2019 115483    65.7N  156.9W 3.5-5.1 CAAAA  Northern Alaska            

 

An M 4.2 also occurred in the Fox Islands, Alaska today. It was not reported felt in this remote area. Two earthquakes of M>=4.2 have occurred within about 100 km of this epicenter since August, 2018 - an M 4.7 on April 8, 2019 and an M 4.5 on January 14, 2019. Forecast 115489 had expected today's activity at the end of April or early May. This event may have been promoted by strong tidal stresses associated with the new moon. This summary had expected this as:

 

"The new moon will arrive on May 4 at 22:45 UT. Areas which are sub-solar at this time are near the longitude 160 West while those antisolar regions are near  20 East Longitude. These include western Europe and the East African Rift in

the East and Hawaii, the Tonga-Kermadec arc and the Aleutians and portions of western Alaska in the West. These are areas where high tidal stresses are most likely to help promote enhanced seismicity at this time until about May 6-7. Other areas of the world may also see seismic enhancement in the next week however, also due to high astronomical tides." (May 2-4, 2019)

 

 

O:  4MAY2019 02:56:29  52.0N  170.4W ML=4.2  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 28APR2019 115489    52.1N  171.3W 3.5-4.9 CAAAA  Andreanoff Isls, Aleutians 

 

Seismitity in California and Nevada returned to background levels today. An M 2.0 in the San Francisco Bay area which occurred within minutes of local solar noon may have been promoted by strong tidal stresses associated with the new moon which maximize at this hour. Forecast 115392 had expected this activity within about 50 km was likely at the end of April.

 

O:  3MAY2019 19:53:35  38.0N  122.2W Md=2.0  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 30APR2019 115392    37.8N  122.6W 2.5-4.6 BAAAA  Central California         

 

SEISMIC ENHANCEMENT CONTINUES IN NORTHERN CARIBBEAN

 

EARTHQUAKE SUMMARY FOR MAY 2, 2019

 

An earthquake of M 4.4 south of the Dominican Republic today was the largest in the current regional activation. NEIC reported it was felt with intensity IV in the Dominican Republic at San Pedro de Macoria and Bajos de Haina, San Cristobal and in Jose Contreras and II-III in Santo Domingo, El Carril, Otra Banda, San Cristobal and Jarabacoa. It was accompanied by smaller quakes of M 3.4 and 3.5. This continues seismic enhancement in the area of the Northern Caribbean which this summary has followed for the past four days. The M 4.4 is the strongest south of the Dominican Republic since an M 5.8 on May 28, 2014. Forecast 115364 had expected activity in this region at the end of April or in early May.

 

O:  3MAY2019 05:38:40  17.8N   68.2W ML=3.4  EMSC   DOMINICAN REPUBLIC REGION    

O:  2MAY2019 12:40:12  17.9N   69.3W mb=4.4  EMSC   DOMINICAN REPUBLIC REGION    

O:  2MAY2019 22:17:12  18.6N   69.8W ML=3.5  EMSC   DOMINICAN REPUBLIC           

P: 30APR2019 115364    20.0N   69.0W 3.0-4.6 ABAAA  Bahamas/No. Caribbean      

 

Enhanced seismicity in the region of California continued today. The largest  event was an M 3.3 in Central California near Templeton but an M 3.0 in the Channel Islands of Southern California may say more about upcoming regional seismicity. This event in the Channel Islands is the strongest in that region within about 50 km of this epicenter since an M 3.0 on June 2, 2017. NEIC reported today's earthquake of M 3.0 in the California Channel Islands was felt with intensity II-III in the area(s) of Point Mugu, Camarillo, Simi Valley, Santa Barbara, Ojai, Los Angeles, Solvang, California. Forecast 115423 had expected an event in this region was likely around May 1.

 

O:  3MAY2019 04:11:17  33.8N  119.3W Ml=3.0  EMSC   CHANNEL ISLANDS REG., CALIFORN

P:  1MAY2019 115423    34.0N  118.7W 2.5-4.4 AAAAA  So. California             

 

The earthquake near Templeton, California of M 3.3 was the strongest in that area within about 50 km of this epicenter since an M 3.5 on April 5, 2019 in conjunction with the last new moon and prior to that an M 3.5 on August 14, 2018,  the only two such events in this area in the past year. NEIC reported this earthquake of M 3.3 in Central California was felt with intensity II-III in the area(s) of Templeton, Cayucos, Paso Robles, Morro Bay, Cambria, Los Osos, Creston, San Simeon and San Luis Obispo, among others within about 50 km of the epicenter in California. Forecast 115390 had expected this region to be active at the end of April or in early May.

 

O:  3MAY2019 05:22:38  35.6N  120.8W Mw=3.3  EMSC   CENTRAL CALIFORNIA           

P: 30APR2019 115390    36.1N  120.1W 2.5-4.6 BAAAA  Central California         

 

ENHANCED SEISMICITY IN NORTHERN CARIBBEAN LINKED TO BURGEONING TROPICAL DEPRESSION

 

EARTHQUAKE SUMMARY FOR MAY 1, 2019

 

An unusually large earthquake of M 4.1 was widely felt in eastern Puerto Rico today. It was preceded by an M 4.6 to the north as reported in this summary in the previous issue as:

 

"An unusual earthquake of M 4.6 north of the Virgin Islands in the North Atlantic Ocean occurred today, This may be an outer rise earthquake preceding moderate to strong activity in the northeastern Caribbean including the Virgin Islands an Puerto Rico.  Outer rise earthquakes occur when a subducting plate buckles due to an obstruction in the subduction zone. When the obstruction is overcome, a moderate to strong earthquake can occur." (May 1, 2019)

 

NHC reported that the first tropical storm of the season formed over this  epicenter about the time of the earthquake. This is a remarkable coincidence if that is what it is. Similar occurrences have been documented in this summary in the past, and promotional effect seems possible. This summary noted this depression as:

 

"A tropical depression in the region of the Bahamas has been given 40% chance of becoming the first tropical depression in the Atlantic Hurricane Season. This system is a long depression passing through the unusual earthquake in the area of M 4.6 which occurred yesterday when the depression formed. It is currently located at about 23N 75W east of Florida. It is expected to track  to the west passing over Florida in the next day." (April 30-May 1, 2019)

 

 

NEIC reported today's Puerto Rico event of M 4.0 was felt with maximum intensity IV in Puerto Rico at Maunabo, Yabucoa, Humacao, Patillas, Las Piedras, San Lorenzo, Arroyo, Juncos, and in general within about 100 km of the epicenter.  A second M 3.9 occurred in the Dominican Republic along with shocks of M 3.6 and 3.2. The last such event of M>=4.0 in eastern Puerto Rico was an M 4.6 on March 12, 2019 and prior to that an M 4.4 on December 9, 2018 the only other events of this magnitude in the past year.  Forecast 115358 had expected this event within about 20 km of the epicenter was likely around May 1. The Dominican Republic has been active in the past four months with seven events of M>=3.9 in this period. The last was an M 3.9 on April 8, 2019 and the last of larger magnitude was an M 4.4 on February 5, 2019. Forecast 115358 had expected this activity around May 1-2. Elevated seismicity in the northern Caribbean is likely to continue for the next several day, especially through the New Moon.

 

O:  2MAY2019 01:10:26  18.0N   65.8W mb=4.0  EMSC   PUERTO RICO                  

O:  2MAY2019 01:10:26  18.0N   65.8W mb=4.1  ANSS   PUERTO RICO                  

P:  1MAY2019 115358    18.0N   66.0W 3.4-5.6 AAAAA  Puerto Rico                

 

O:  1MAY2019 23:51:13  18.5N   68.8W mb=3.9  EMSC   DOMINICAN REPUBLIC           

O:  1MAY2019 20:43:35  18.5N   69.0W ML=3.6  EMSC   DOMINICAN REPUBLIC           

O:  2MAY2019 04:53:01  18.7N   68.3W Md=3.2  EMSC   DOMINICAN REPUBLIC REGION    

P: 28APR2019 115358    19.0N   68.0W 3.4-5.2 BAAAA  Puerto Rico                

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the aftershock zone in northwestern Alaska. It was not reported felt in this remote area. This is northeast of the strong swarm which has hit the region about 150 km southwest of this epicenter since February 2019 and does not appear to be an aftershock in that area. An M 5.3 did occur about 50 km from this epicenter on October 14, 2018, the only such event within about 100 km of this epicenter since an M 4.6 on August 13, 1993. Forecast 115483 had expected today's epicenter would be active at the end of April. This earthquake is located at 102 degrees from the M 7.0 in Peru of March 1, 2019 and may have been promoted from that event.

 

O:  1MAY2019 19:36:45  67.3N  156.4W mb=4.6  EMSC   NORTHERN ALASKA              

P: 24APR2019 115483    65.7N  156.9W 3.5-5.1 CBAAA  Northern Alaska            

 

Seismicity in California remained at elevated levels today following two days of enhanced regional seismicity which has included moderate earthquakes in northern and central California. The strongest earthquake in the area today was an M 3.9 in Nevada east of Mammoth Lakes, California. This is the strongest earthquake within about 50 km of this epicenter in Nevada since an M 4.0 on August 12, 2017. Forecast 115386 had expected activity in this area around May 1.

 

O:  1MAY2019 17:41:37  37.4N  118.7W ML=2.9  EMSC   CENTRAL CALIFORNIA           

O:  1MAY2019 19:30:20  38.0N  118.4W ML=3.9  EMSC   NEVADA                       

P:  1MAY2019 115386    37.3N  118.3W 2.5-4.4 AAAAA  California/Nevada area     

 

NEIC also reported an earthquake of M 3.4 in Northern California was felt with intensity IV in Calistoga, California and II-III in the area(s) of Santa Rosa, Kenwood, Angwin, Windsor, Saint Helena, California. This is not part of the Geysers area of Northern California. The lat events in the region outside the Geysers within about 50 km of this epicenter of M>=3.4 occurred on February 17, 2019 and prior to that an M 3.4 on November 11, 2016. Mot activity in the area occurs to the east of today's epicenter. Forecast 115393 had expected today's activity at the end of April.

 

O:  2MAY2019 05:17:54  38.5N  122.6W ML=3.4  EMSC   NORTHERN CALIFORNIA          

O:  1MAY2019 15:15:26  38.6N  122.9W Md=2.2  EMSC   NORTHERN CALIFORNIA          

P: 28APR2019 115393    38.5N  122.7W 2.5-4.6 BAAAA  Central California         

 

UNUSUAL M 4.6 NORTH OF VIRGIN ISLANDS MAY PRECEDE REGIONAL ENHANCEMENT

 

EARTHQUAKE SUMMARY FOR APRIL 30, 2019

 

An unusual earthquake of M 4.6 north of the Virgin Islands in the North Atlantic Ocean occurred today. This may be an outer rise earthquake preceding moderate to strong activity in the northeastern Caribbean including the Virgin Islands an Puerto Rico. Outer rise earthquakes occur when a subducting plate buckles due to an obstruction in the subduction zone. When the obstruction is overcome, a moderate to strong earthquake can occur. Today's event is the first in the region since an M 4.6 on February 28, 2016. The last of larger magnitude was an M 5.8 on July 29, 2006 followed by an aftershock of M 4.9 on September 22, 2006. Forecast 115363 had expected today's activity was likely at the end of April.

 

O: 30APR2019 08:06:51  23.7N   63.0W mb=4.6  EMSC   NORTH ATLANTIC OCEAN         

P: 22APR2019 115363    20.0N   63.0W 3.0-4.9 CCAAA  Bahamas/No. Caribbean      

 

The strongest earthquake in the world today was an M 5.4 in the Northern Mid-Atlantic Ridge. This event occurred to the southeast of the M 4.6 north of the Virgin Islands. This is the strongest earthquake within about 200 km of this epicenter since an M 6.0 on September 18, 2015 and a similar M 6.0 on September 5, 2013.  Forecast 115351 had expected this event in this area waws likely at the end of April.

 

O: 30APR2019 20:52:21  15.3N   46.4W Mw=5.4  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 25APR2019 115351    17.0N   47.0W 4.0-5.6 BBAAA  Mid-Atlantic Ridge         

 

California remained the most active region of the U.S. or Canada today. Light earthquakes of M 3.3, 3.3, and 3.0 among others were felt in Southern and Baja

California and an M 3.4 occurred off the coast of Central California and was followed by an M 2.2 aftershock. The events of M 3.3 in Baja California were the first with that magnitude or greater since an M 3.3 on February 6, 2019 and prior to that an M 3.5 on November 20, 2018 - an aftershock of an M 4.8 of November 19, 2018.  Forecast 115417 had expected this activity was likely around April 27.

 

O: 30APR2019 15:13:20  32.1N  115.1W ML=3.0  EMSC   BAJA CALIFORNIA, MEXICO      

O: 30APR2019 16:46:06  32.1N  115.1W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO      

O: 30APR2019 18:58:41  32.1N  115.1W Ml=2.7  EMSC   BAJA CALIFORNIA, MEXICO      

O: 30APR2019 20:31:23  32.1N  115.1W Ml=3.3  EMSC   BAJA CALIFORNIA, MEXICO      

O: 30APR2019 20:32:28  32.1N  115.1W Ml=3.3  EMSC   BAJA CALIFORNIA, MEXICO      

P: 27APR2019 115417    32.1N  115.9W 2.5-4.4 BAAAA  So. California             

 

The M 3.4 off the coast of Central California was the strongest within about

50 km of that epicenter since an M 3.5 on June 3, 2014 nearly five years ago

 on June 3, 2014, an aftershock of a series including an M 4.1 in February, 2014. Forecast 115381 had expected activity in this area around April 30.

 

NEIC reported this earthquake of M 3.5 in Central California was felt with intensity II-III in the area(s) of Big Sur, California.

 

O:  1MAY2019 04:01:13  35.8N  121.4W Md=2.2  EMSC   CENTRAL CALIFORNIA           

O: 30APR2019 17:10:49  35.8N  121.4W Ml=3.4  EMSC   OFFSHORE CENTRAL CALIFORNIA  

P: 30APR2019 115391    36.4N  121.0W 2.5-4.6 AAAAA  Central California         

 

Two light earthquakes of M 3.1 each also occurred in the current swarm in northern Nevada today. Forecast 115388 had expected regional seismicity enhancement around May 1.

 

O:  1MAY2019 00:14:08  39.8N  117.5W ML=3.1  EMSC   NEVADA                       

O:  1MAY2019 00:38:48  39.8N  117.5W ml=2.3  EMSC   NEVADA                       

O: 30APR2019 10:11:02  39.8N  117.5W ml=3.1  EMSC   NEVADA                       

P:  1MAY2019 115388    39.1N  119.6W 2.5-4.4 AABAA  California/Nevada area     

 

MODERATE QUAKES SHAKE NORTHERN CALIFORNIA; UNUSUAL N 6.2 IN CARLSBERG RIDGE

 

EARTHQUAKE SUMMARY FOR APRIL 29, 2019

 

Several moderate sized earthquakes shook the region of northern and central California today. These included an M 4.3 in the northern Lake country and an M 3.8 in the Mammoth Lakes region on the California-Nevada border. These follow an M 4.2 in northern Nevada yesterday which was followed by light aftershocks today. Seismic activation of California-Nevada is common during late April and early May and may be related to rainfall and fault lubrication on a seasonal basis.

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in northern California. NEIC reported maximum intensity IV in northern California at Redwood Valley, Potter Valley and Willits with II-III within about 75 km of the epicenter at Ukiah, Upper Lake, Comptche, Philo, Boonville and Makeport among others. NEIC reported these earthquakes of M 2.8 an M 4.3 in Northern California was felt with intensity II-III in the area(s) of Redwood Valley, Potter Valley, Willits, Ukiah and Comptche, California. The last earthquake within about 50 km of today's epicenter with M>=4.3 was an 4.3 on December 14, 2017. The last of larger magnitude was an M 5.1 on August 10, 2016 and an M 4.5 on September 25, 2012. Forecast 115464 had expected a moderate quake in this area around April 26.

 

O: 29APR2019 07:46:38  39.4N  123.2W Md=2.0  EMSC   NORTHERN CALIFORNIA          

O: 29APR2019 07:16:08  39.3N  123.2W mw=4.3  ANSS   NNW of Redwood Valley

O: 30APR2019 05:30:45  39.4N  123.2W Md=2.3  EMSC   NORTHERN CALIFORNIA

O: 30APR2019 05:04:05  39.4N  123.2W Md=2.8  EMSC   NORTHERN CALIFORNIA

O: 29APR2019 07:16:08  39.4N  123.2W Mw=4.2  EMSC   NORTHERN CALIFORNIA

P: 26APR2019 115464    40.0N  123.0W 2.5-4.6 BAAAA  Northern California        

 

O: 29APR2019 16:28:21  39.8N  117.4W ML=2.4  EMSC   NEVADA

O: 29APR2019 19:25:28  39.8N  117.4W ml=2.3  EMSC   NEVADA

 

The M 3.8 in the California-Nevada border region was felt with light intensity throughout the area. NEIC reported this earthquake of M 3.8 in the California-Nevada border region was felt with intensity II-III in the area(s) of Bishop, California. The M 3.8 is the strongest in the Mammoth Lakes region within about 50 km of today's epicenter since an M 3.8 on December 8, 2017 and prior to that an M 4.0 on August 12, 2017. Note that the event in December, 2017 was also associated with the December 14, 2017 event in Northern California (see above). Forecast 115386 had expected today's event was likely within about 15 km of the epicenter around April 27. 

 

O: 29APR2019 17:39:13  37.4N  118.4W Md=2.2  EMSC   CENTRAL CALIFORNIA           

O: 29APR2019 17:37:01  37.4N  118.4W Mw=3.8  EMSC   CENTRAL CALIFORNIA           

O: 29APR2019 17:46:11  37.4N  118.4W ml=2.4  EMSC   CENTRAL CALIFORNIA           

P: 27APR2019 115386    37.4N  118.6W 2.5-4.6 AAAAA  California/Nevada area     

 

Enhanced seismicity also continued in the Geysers area of Northern California

today where event of M 2.9 and 3.0 were recorded among others. Forecast 115393 had expected this activity around April 29.

 

NEIC reported these earthquakes of M 3.0 and 2.9 in the Geysers, California  were felt with intensity II-III in the area(s) of Geyserville, Kelseyville and Middletown, California.

 

O: 29APR2019 19:55:25  38.8N  122.7W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 29APR2019 19:54:06  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 29APR2019 20:05:05  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 29APR2019 22:00:50  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 29APR2019 15:24:39  38.8N  122.8W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 29APR2019 19:40:46  38.8N  122.8W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 29APR2019 19:43:13  38.8N  122.8W Ml=2.9  EMSC   NORTHERN CALIFORNIA

O: 29APR2019 19:52:04  38.8N  122.8W Ml=3.0  EMSC   NORTHERN CALIFORNIA

P: 29APR2019 115393    38.9N  122.8W 2.5-4.6 AAAAA  Central California         

 

The strongest earthquake in the world today was an unusual M 6.2 in the Carlsberg Ridge south of Iran. This is a remote area and this event was not reported felt. Only three other earthquakes of M>=6.2 have hit within about 300 km of this epicenter in the past 30 years - an M 6.5 on May 26, 1995; an M 6.4 on October 1, 1996 and the last an M 6.2 more than 12 years ago on January 17, 2007. Forecast 115336 had expected regional activity to the north was likely around April 29. The landfall of TC Kenneth to the south in east Africa yesterday probably helped enhance this event.

 

O: 29APR2019 14:19:52  10.9N   57.3E Mw=6.2  EMSC   CARLSBERG RIDGE              

O: 29APR2019 14:19:52  10.9N   57.2E mw=6.2  ANSS   Carlsberg Ridge

P: 29APR2019 115336    15.0N   56.0E 3.5-5.0 ACAAA  Arabian Sea                

 

 

 

 

 

 

 

 

 

 

MODERATE QUAKES FROM ATLANTIC TO NORTHERN SOUTH AMERICA

 

EARTHQUAKE SUMMARY FOR APRIL 28, 2019

 

The strongest earthquake in the world today was an M 5.4 in the Northern Mid-Atlantic Ridge. It occurred north of the Azores and was not reported felt in this remote area. The last earthquake of M>=5.4 within about 200 km of this epicenter was an M 5.6 on October 31, 2011. The only event of significantly larger magnitude in the area in the past 30 years was an M 5.9 on December 19, 2008 otherwise earthquakes of M 5.4-5.5 appear to occur in clusters at the end of each decade since 1990. Forecast 115462 had expected today's event within about 100 km of the epicenter was likely around April 27.

 

O: 29APR2019 02:48:51  43.1N   29.2W Mw=5.4  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 27APR2019 115462    42.0N   29.0W 4.0-5.4 ABAAA  No. Mid-Atlantic Ridge     

 

The strongest earthquake felt in the world today occurred off the coast of Honduras. NEIC reported it was felt with intensity IV in Honduras at Savannah Bight, Guanaja Islas, Monte Placentero, Roatan, La Ceiba and II-III in Jose Santos Guardiola, French Harbor, Sandy Bay Islas de la Bahia and in Honduras at Tocoa Colon and La Colorada Yoro. Northern South America was also active with an M 5.0 in northern Venezuela. The earthquake of M 5.1 off the coast of Honduras is the strongest within about 100 km of that epicenter since an M 5.1 on September 29, 2016 - the last of larger magnitude were M 5.3-5.4 on January 18, 2016 and M 5.9 on April 27, 2011.  Forecast 115065 had expected this event within Honduras within about 25 km of the epicenter at the end of April.

 

O: 28APR2019 07:43:46  16.8N   86.1W Mw=5.1  EMSC   OFFSHORE HONDURAS            

P: 21APR2019 115065    17.0N   86.0W 3.5-5.1 CAAAA  Honduras                    

 

The earthquake in Venezuela of M 5.0 is the strongest within about 200 km of that epicenter since an M 7.3 about 200 km north of this on August 21, 2018. NEIC reported this earthquake of M 5.0 in Venezuela was felt with intensity II-III in the area(s) of Ciudad Guayana, Bolivar and Palo Negro Aragua, Venezuela.

No earthquakes of M>=5.0 have been recorded within 100 km of today's epicenter in at least 30 years. The last near this area was an M 5.5 on January 15, 2010. Forecast 115362 had expected this event within about 100 km of the epicenter was likely around April 23.

 

O: 28APR2019 17:48:24   9.3N   63.1W mb=5.0  EMSC   MONAGAS, VENEZUELA           

P: 23APR2019 115362    10.0N   63.0W 3.4-5.1 BAAAA  Windward Islands           

 

The strongest earthquake in the U.S. or Canada today was an M 4.0-4.1 in Nevada.

Four such earthquakes have occurred within about 50 km of today's epicenter in the past 30 years including an M 4.1 and 4.5 in 1999 and an M 4.2 on January 23, 2003, the last such event in the region. An M 4.0 aftershock and several foreshocks occurred with the M 4.1 mainshock today. Forecast 115388 had expected regional seismicity would be enhanced around April 25.

 

O: 28APR2019 10:20:46  39.7N  116.9W ml=2.1  EMSC   NEVADA

O: 29APR2019 03:16:36  39.8N  117.4W ML=3.1  EMSC   NEVADA

O: 28APR2019 17:10:40  39.8N  117.5W ML=3.5  EMSC   NEVADA

O: 29APR2019 02:20:42  39.8N  117.5W ml=2.1  EMSC   NEVADA

O: 28APR2019 19:49:37  39.8N  117.5W ml=2.3  EMSC   NEVADA

O: 28APR2019 20:13:45  39.8N  117.5W ml=3.3  EMSC   NEVADA

O: 28APR2019 17:03:16  39.8N  117.5W ml=4.0  EMSC   NEVADA

O: 28APR2019 21:59:49  39.8N  117.5W ml=4.1  ANSS   NEVADA

O: 28APR2019 18:47:42  39.9N  117.4W ml=2.2  EMSC   NEVADA                       

P: 25APR2019 115388    38.3N  119.3W 2.5-4.5 BBBAA  California/Nevada area     

 

MODERATE AFTERSHOCKS CONTINUE IN NORTHERN MINDANAO, PHILIPPINES

 

EARTHQUAKE SUMMARY FOR APRIL 26, 2019

 

The strongest seismicity in the world today occurred as a series of shocks in

Northern Mindanao, Philippines including events of M 5.3-5.5, 5.2 and 5.1. The strongest of these was an M 5.3-5.5. PHIVOLCS reported it was felt with  ntensity III in General Luna, Burgos and Dapa, Surigao Del Norte; II in Socorro, Surigao Del Norte; Cagdianao and Libjo, Dinagat Island and I in Surigao City; Sison, Surigao Del Norte, Loreto, Dinagat Island, Philipines. in Surigao City, Mindanao, Philippines. NEIC reported this earthquake of M 5.3 off Northern Mindanao, Philippines  was felt with intensity IV in Purok, Caraga and II-III in the area(s) of Caraga, Philippines at Pilar and Brasilisa.

The M 5.5 follows a similar event of M 5.5 on April 1 and is probably an aftershock of an M 6.0 on March 8, 2019.  Forecast 115346 had expected activity in this area around April 22.

 

O: 26APR2019 20:28:30   9.8N  126.6E Mw=5.2  EMSC   MINDANAO, PHILIPPINES        

O: 26APR2019 08:04:30   9.8N  126.6E Mw=5.3  EMSC   MINDANAO, PHILIPPINES        

O: 26APR2019 08:04:22  09.8N  126.7E MS=5.5  PHI  Felt with intensity III

O: 26APR2019 10:54:54   9.8N  126.7E mb=5.0  EMSC   MINDANAO, PHILIPPINES        

O: 26APR2019 21:22:45   9.9N  126.7E mb=4.8  EMSC   MINDANAO, PHILIPPINES        

O: 26APR2019 19:11:28  10.0N  126.6E mb=4.8  EMSC   MINDANAO, PHILIPPINES        

P: 22APR2019 115346    11.0N  125.0E 3.5-5.1 BABAA  Luzon, Philippines          

 

An unusually large M 3.5 occurred in Grand Bank, Newfoundland, Canada today. It was not reported felt in this remote area. Five such earthquakes within about 250 km of this epicenter have occurred in the past 30 years according to NEIC data. The last was an M 3.9 on August 6, 2018 and before that on M 4.0 on April 15, 2011. Large earthquakes in this area could trigger undersea landslides.

 

O: 26APR2019 08:48:44  44.6N   56.3W MB=3.5  ECAN Grand Bank, NL                 

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in the Unimak Island region of Alaska. It was not reported felt in this remote area. The last earthquake of larger magnitude in the Unimak Island area occurred a month ago on March 26, 2019 with M 4.0. Forecast 115504 had expected today's event within about 50 km of the epicenter was likely around April 26.

 

O: 26APR2019 15:31:01  54.2N  164.4W ML=3.7  EMSC   UNIMAK ISLAND REGION, ALASKA 

P: 26APR2019 115504    54.2N  165.0W 3.5-4.9 AAAAA  Unimak Islands, Aleutians   

 

An earthquake of M 4.7 in the Mauritius-Reunion area of the South Indian Ocean today continued regional activation which has accompanied the passage of Tropical Cyclone Kenneth through the area as noted in previous summaries:

 

"TC Kenneth (24S) continued today west of the Comoros Islands with winds up to 90 kts. It It made landfall on the coast of Africa may today and could promote seismicity on the East Africa Rift." (April 25-26, 2019)

 

An earthquake of M 6.0 hit this region on April 1, 2019. This is probably an

aftershock of that event. Forecast 115530 had expected today's event within about 200 km of the epicenter was likely around April 28.

 

O: 27APR2019 06:24:36  18.1S   65.6E mb=4.7  EMSC   MAURITIUS - REUNION REGION   

P: 28APR2019 115530    17.0S   67.0E 4.0-5.6 ABAAA  So. Indian Ocean           

 

MODERATELY STRONG EARTHQUAKES CONTINUE IN CENTRAL CHILE

 

EARTHQUAKE SUMMARY FOR APRIL 25, 2019

 

As yesterday, the strongest activity in the world today occurred in northern Chile. An event of M 5.5-5.6 off the coast of Antofagasta, Chile was reported widely felt in the region. Yesterday this summary noted the M 5.4 about 500 km north of today's epicenter as:

 

"The strongest earthquake in the world today was an M 5.4 in northeastern Chile in the Antofagasta region. CSN reported this earthquake was felt with intensity  IV in  Antofagasta at Calama and Tocopilla; III in Maria Elena and II in Antofagasta; in Tarapaca with III in Iquique and in Arica with III in Cuya, Chile. NEIC reported this earthquake of M 5.4 in Northern Chile was felt with intensity IV in the area(s) of Iquique, Tarapaca, Chile." (April 24-25, 2019)

 

Today's M 5.5 off Antofagasta was somewhat unusual in its epicenter. Most moderately strong quakes in the region in recent years have occurred several hundred km north or south of this. The last earthquake within about 200 km of today's epicenter was a similar M 5,.5-5.6 on January 30, 2019 but the last of larger magnitude in this area was an M 6.1 on July 25, 2016 nearly three years ago. Forecast 115539 had expected today's event was likely within about 25 km of this epicenter around April 24.

 

NEIC reported this earthquake of M 5.5 in Northern Chile was felt with intensity II-III in the area(s) of Taltal, Antofagasta and Copiapo, Atacama, Chile.

CSN reported this earthquake was felt with intensity IV in  Chile.

 

O: 26APR2019 06:22:33  25.9S   70.9W Mw=5.5  EMSC   OFFSHORE ANTOFAGASTA, CHILE  

O: 26APR2019 06:22     26.0S   70.8W mb=5.6  GUC    Chile.                       

P: 24APR2019 115539    26.0S   71.0W 4.0-5.4 AAAAA  Coast Central Chile        

 

Moderately large earthquakes also continued the current activation of the Philippines which began several days ago with an M 6.0 near Manila and an M 6.5 in Samar. An M 5.5 in northern Mindanao today joined an M 5.7 in Sulawesi (local magnitude). NEIC reported this earthquake of M 5.2-5.5 in Northern Mindanao, Philippines was felt with intensity II-III in the area(s) of Caraga, Philippines at Purok, Pilar, Madrid and Brasilisa. Forecast 115346 had expected this activity was likely around April 22.

 

O: 26APR2019 06:04:27   9.8N  126.5E mb=5.0  EMSC   MINDANAO, PHILIPPINES        

O: 26APR2019 05:27:07   9.8N  126.6E mb=5.2  EMSC   MINDANAO, PHILIPPINES        

O: 26APR2019 05:26:59  09.8N  126.8E MS=5.5  PHI  Felt with intensity II

P: 22APR2019 115346    11.0N  125.0E 3.5-5.1 BBAAA  Luzon, Philippines         

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in the current active area of the western Andreanof Islands, Aleutians, Alaska. The last event in the area with M>=4.1 within about 100 km of this epicenter was an M 4.9 on April 21, 2019. An M 5.2 hit the area on March 11, 2019.  Forecast 115488 had expected today's event within about 50 km was likely around April 25.

 

O: 26APR2019 00:37:01  51.2N  178.0W mb=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 25APR2019 115488    51.8N  178.0W 3.5-5.3 AAAAA  Andreanoff Isls, Aleutians 

 

 

 

 

 

SOUTHEASTERN U.S. SEISMICITY ACTIVE

 

EARTHQUAKE SUMMARY FOR APRIL 24, 2019

 

An unusually large M 3.7 quake hit the region of western Tennessee today and was widely felt. NEIC reported IV in Tennessee at Dyersburg, Newbern, Obion, Finley, and Trimble and Hayti and III in Ridgely, Caruthersville, Hornbeak and Halls, Tennessee among others. It was reported lightly felt as far as Texas, Ohio, Illinois, West Virginia, South Carolina, North Carolina, Kansas, Missouri, Arkansas, Kentucky, and Mississippi. This was the largest earthquake in the U.S. or Canada today. The last earthquake in the New Madrid area of Tennessee within about 100 km of today's epicenter with M>=3.7 occurred  more than 1.5 years ago on October 15, 2017 with M 3.6-3.7. The last of larger magnitude occurred more than five years ago on April 2, 2015 with M 3.6-4.0.i Prior to that an M 3.9 hit the region on February 21, 2012.  Forecast 115405 had expected today's event with magnitude up to M 4.1 was likely around April 24.

 

O: 24APR2019 10:56:53  36.1N   89.4W ML=3.6  EMSC   TENNESSEE                    

O: 24APR2019 10:56:54  36.1N   89.4W ML=3.7  ANSS   TENNESSEE                    

P: 24APR2019 115405    36.5N   89.6W 2.0-4.1 AAAAA  New Madrid area            

 

An unusual earthquake in central Alabama also occurred today with M 2.5. This is north of the swarm on the Alabama-Florida border which has been active in recent weeks and is not part of that series. An earthquake of M 2.6 hit about 100 km southwest of this yesterday on April 23, 2019 and prior to that on July 6, 2017 with M 2.8. Forecast 115433 had expected regional seismic enhancement around April 27.

 

O: 24APR2019 07:36:20  33.5N   87.3W Md=2.5  EMSC   ALABAMA                      

P: 27APR2019 115433    31.0N   87.0W 2.0-4.2 BCAAA  Southeast U.S.             

 

The strongest earthquake in the world today was an M 5.4 in northeastern Chile in the Antofagasta region. CSN reported this earthquake was felt with intensity  IV in  Antofagasta at Calama and Tocopilla; III in Maria Elena and II in Antofagasta; in Tarapaca with III in Iquique and in Arica with III in Cuya, Chile. NEIC reported this earthquake of M 5.4 in Northern Chile was felt with intensity IV in the area(s) of Iquique, Tarapaca, Chile.  The last earthquake of M>=5.4 within about 150 km of this epicenter was an M 5.4 on January 24, 2018. The last of larger magnitude was an M 5.7 on May 14, 2017. Forecast 115538 had expected this event within about 100 km of this epicenter was likely around April 27.

 

O: 24APR2019 18:57:31  21.6S   68.5W Mw=5.4  EMSC   ANTOFAGASTA, CHILE           

O: 24APR2019 18:57     21.5S   68.5W mb=5.2  GUC    Antofagasta at Calama and Toco

P: 27APR2019 115538    22.0S   68.0W 4.0-5.4 BAAAA  Argentina                  

 

Over the past several days this summary has been following seismicity in Mayotte associated with the passage of Tropical Cyclone Kenneth. Kenneth made landfall today in east Africa as noted in this summary:

 

"TC Kenneth (24S) continued today west of the Comoros Islands with winds up to 145 kts. It is expected to track to the west over Mayotte in the next day. Some seismicity may be enhanced in the region of Mayotte. Landfall on the coast of Africa may occur today and could promoted seismicity on the East Africa Rift." (April 24-26, 2019)

 

So, it should come as no surprise that n M 4.6 near Lake Mweru, Congo was recorded as this landfall occurred.  The last earthquake within about 150 km of this epicenter with M>=4.6 was an M 4.7 on April 5, 2017 more than two years ago and prior to that an M 5.9 on April 24, 2017. Forecast 115317 had expected activity in the area was likely to the north around April 24.

 

O: 24APR2019 10:05:56   8.1S   29.5E mb=4.6  EMSC   LAKE MWERU REGION, CONGO-ZAMBI

P: 24APR2019 115317     6.0S   30.0E 3.0-4.6 ABAAA  Lake Victoria area         

 

STRONG EARTHQUAKE SHAKES NORTHERN INDIA

 

EARTHQUAKE SUMMARY FOR APRIL 23, 2019

 

The strongest earthquake in the world today was an M 5.9-6.0 in northern India. NEIC reported maximum intensity in Arunachal Oradesh at Along with IV; V in Pasighat, Dhemaji, Chapua and Tinsukia, Assam, and IV in Basar, Arunachal Pradesh and in Assam in Dibrugarh, Barbari, Makum and Dum Duma, India.  IMD reported this earthquake was felt with intensity V in Arunachal Pradesh, India at Dibrugarh, IV in Dimapur, Nagaon, III in Guwahati and Imphal. While some panic occurred with residents, no major damage or casualties were reported with today's event. A second quake, perhaps a regional aftershocks hit the Medog county in Nuingchi City near Arunachal Pradesh in Tibet.  NEIC reported this earthquake of M 4.7 in Nepal was felt with intensity V in Nepal at Bidur, Nuwakot; IV in Kirtipur, Kathmandu, Lalitpur, Tribuvannagar and Bhaktapur and II-III in the area(s) of Pokhara, Tansen, Janakpur and Damak, Nepal.  IMD reported this earthquake was felt with intensity  IV in Northern India at Battiah, Motihan, Riga, Sheohar and III in Patrauna.

 

IMD (India Meteorological Department) gave the event M 5.9 while other teleseismic reporters gave slightly higher magnitudes. The mainshock occurred near local solar midnight and may have been promoted by strong tidal stresses.   

 

The last earthquake with M>=5.8 in the Arunachal Pradesh area of India within about 200 km of this epicenter was an M 6.3 on November 17, 2017 and prior to that an M 6.1 on September 21, 2009 - the only such events in the region in the past 30 years. Forecast 115372 had expected moderate activity within this region between April 24 and 26.

 

O: 23APR2019 20:15:50  28.5N   94.6E Mw=5.9  EMSC   ARUNACHAL PRADESH, INDIA     

O: 23APR2019 20:15:48  28.6N  094.4E MS=5.8  IMD  Felt with intensity V in Arunachal Pradesh

P: 24APR2019 115372    24.0N   94.0E 4.0-5.4 ACAAA  Myanmar                    

P: 26APR2019 115372    27.0N   97.0E 4.0-5.4 BBBAA  Myanmar                    

 

O: 24APR2019 00:44:32  27.9N   85.1E mb=4.7  EMSC   NEPAL                        

O: 24APR2019 00:44:33  27.7N  085.1E MS=4.9  IMD  Felt with intensity  IV

P: 29APR2019 115374    27.0N   88.0E 3.5-5.4 BACAA  Nepal                      

 

A strong earthquake of 5.9-6.0 also occurred in the region south of the Fiji Islands today. This is a remote area and this event was not reported felt. Forecast 115549 had expected it within about 100 km of the epicenter was likely around April 26. The last earthquake within about 200 km of this epicenter with M>=6.0 occurred as an M 6.9 on February 24, 2017 with M 6.9. This epicenter is located at 102 degrees from the M 7.0 in Peru of March 1 and the M 7.5 in Ecuador of February 22 and may have been promoted from those sources.

 

O: 23APR2019 15:22:54  23.9S  180.0W mb=4.6  EMSC   SOUTH OF FIJI ISLANDS        

O: 23APR2019 14:20:14  24.9S  178.8W Mw=5.9  EMSC   SOUTH OF FIJI ISLANDS        

O: 23APR2019 14:20:17  24.7S  178.8W mw=6.0  ANSS   the Fiji Islands

P: 26APR2019 115549    25.0S  179.0W 4.0-5.5 BAAAA  Tonga Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in the current aftershock sequence in north-western Alaska. It was accompanied by foreshocks and aftershocks of M 3.6 and 3.4 and 3.8. The M 4.4 is the strongest aftershock of the sequence which began on October 14, 2018. The last such event in the area was an M 5.2 on March 26, 2019. Forecast 115483 had expected today's activity was likely around April 24.

 

O: 23APR2019 15:38:57  66.3N  156.9W ml=3.4  EMSC   NORTHERN ALASKA              

O: 24APR2019 02:40:02  66.3N  157.0W mb=3.8  EMSC   NORTHERN ALASKA              

O: 23APR2019 13:39:51  66.3N  157.2W ML=3.6  EMSC   NORTHERN ALASKA              

O: 23APR2019 15:32:43  66.3N  157.2W Mw=4.4  EMSC   NORTHERN ALASKA              

P: 24APR2019 115483    65.7N  156.9W 3.5-5.1 AAAAA  Northern Alaska            

 

Seismicity continued in the Mayotte area east of Africa. This is probably related to the passage of Tropical Cyclone Kenneth which passed over this epicenter about the time of this earthquake as noted in previous issues  of this summary:

 

"TC Kenneth (24S) formed today east of the Comoros Islands with winds up to 90 kts. It is expected to track to the west over Mayotte in the next day. Some seismicity may be enhanced in the region of Mayotte. The antipode at 11N 145W is south of  Hawaii, and some seismicity may be promoted in Hawaii as this storm moves west." (April 23-24, 2019)

 

A similar event hit the region yesterday. Forecast 115248 had expected this activity was likely around April 18.

 

O: 23APR2019 22:35:36  12.8S   45.4E mb=4.6  EMSC   MAYOTTE REGION               

P: 18APR2019 115248    14.0S   44.0E 3.0-4.4 BBBAA  Madagascar area            

 

DEADLY EARTHQUAKES STRIKE AT CENTRAL PHILIPPINES

 

EARTHQUAKE SUMMARY FOR APRIL 22, 2019

 

Global seismic quiet came to an end today with earthquakes of M 6.1 and 6.4 in the Central Philippines; an M 6.0 in the South Sandwich Islands and moderately large events of M 5.4-5.6 in Vancouver, British Columbia, Canada; off the coast of northern Honshu, Japan and in Oaxaca, Mexico. Seismicity in California also  showed a moderate increase at this time with an M 3.9 in the Imperial Valley region of southern California.

 

A pair of strong earthquakes of M 6.1 and 6.4 hit the Luzon, Central Philippines about 60 km NW of Manila and Samar Island, Leyte today. Initial reports indicated the first of these killed at least 16. Five people died when a five-story supermarket collapsed (pancaked) on the store. Electricity was cut to prevent fires.  Many people were crushed beneath collapsing building in the Pampanga Province and at least 24 are still missing. Landslides block roads as boulders rolled down mountain sides and most public transportation was suspended. The second earthquake in Samar was reported to have damaged homes and roadways as well. This event was located about 75 km from Tacloban City, which has a population of about a quarter million. In Samar, at least five houses were destroyed in the city of Catbalogan. Three dams in the Central Philippines sustained damage. No tsunami was expected nor observed with either of these earthquakes.

 

While the earthquake in Samar was probably triggered by stress redistribution following the Luzon quake, tidal promotion cannot be completely dismissed.  The Samar earthquake occurred new local solar noon when tidal stresses maximize. It also occurred at 11N latitude when the sun was directly overhead at local solar noon (subsolar). This enhanced vertical stresses and probably helped promote the second earthquake as noted in previous issues of this report:

 

"The full moon arrived at 11:12 UT on April 19, 2019. Longitudes which were sub-solar at this time were near 15 East and 165 West. These include areas of central and western Europe in the east and the Aleutian Islands and western Alaska in the West. Other areas which may see enhanced tidal promotion at this time are the Kermadec-Tonga arc north to Samoa. While these regions will experience maximum stress from the tidal alignment, many other areas could see enhanced seismicity in the next five days and a strong earthquake is likely in this time period." (April 19-22, 2019)

 

NEIC reported major damage in the Luzon quake with intensity up to IX. VIII was reported from Central Luzon at Del Carmen with VII in Bodega, Calangain, Guta, Hermosa, Lubao and VI in San Benito, Irani and San Basilio, Central Luzon and as far as 150 km from the epicenter with intensity up to IV. PHIVOLCS reported it was felt with intensity VI - San Marcelino, and Subic, Zambales; Floridablanca, Lubao, and Porac, Pampanga; Angeles City; Olongapo City; Intensity V - Castillejos, and San Felipe, Zambales; Magalang, Mexico, and San Fernando, Pampanga; Abucay, Balanga, and Mariveles, Bataan; Malolos, and Obando, Bulacan; Indang, Cavite; Lipa City; Makati City; Mandaluyong City; Manila City; Quezon City; Pasay City; San Juan City; Taguig City; Tarlac City; Valenzuela City; Intensity IV - Meycauayan, Plaridel, and San Jose Del Monte, Bulacan; San Rafael, Tarlac; Rosales and Villasis, Pangasinan; Itogon, and La Trinidad, Benguet; Kasibu, Nueva Vizcaya; Gabaldon, Nueva Ecija; San Mateo, Rizal; Bacoor, Imus, and Maragondon, Cavite; Nasugbu, Batangas; Antipolo City; Baguio City; Caloocan City; Las Pi¤as City; Marikina City; Pasig City; Tagaytay City; Intensity III - Marilao, Bulacan; Santo Domingo, and Talavera, Nueva Ecija; Maddela, Quirino; Dingalan, Aurora; Lucban, Quezon; Santa Cruz, Laguna; Carmona, Dasmari¤as, General Trias, and Silang, Cavite; San Nicolas and Talisay, Batangas; Cabanatuan City; Calamba City; Gapan City; Muntinlupa City; Palayan City; Intensity II - Baler, Aurora; Philippines.

 

This was the strongest shallow focus earthquake within about 150 km of Manila and this epicenter since an M 6.2 on October 9, 2003. Intermediate focus events of M 6.1-6.4 hit this area on August 11, 2017 and October 8, 2004 (M 6.2 and 6.4).  Forecast 115059 had expected this activity was likely in mid-April.

 

O: 22APR2019 09:11:11  14.9N  120.5E Mw=6.1  EMSC   LUZON, PHILIPPINES           

O: 22APR2019 09:11:11  14.9N  120.5E mw=6.1  ANSS   ESE of Gutad Philippines

O: 22APR2019 09:11:09  15.2N  120.3E MS=6.1  PHI  Felt with intensity VI

P: 17APR2019 115059    13.0N  122.0E 3.5-5.0 BBBAA  Luzon, Philippines         

 

NEIC reported maximum intensity in the Samar earthquake of VIII (major damage) was felt in Baras, Paranas and Jiabong, with VI in Borongan, Silanga, San Antonio, San Policarpio and Pawing with V in Palo and IV in Catbalogan, Eastern Visayas, Philippines. PHIVOLCS reported the M 6.5 was felt with intensity VI - San Julian, Eastern Samar; Intensity V - Tacloban City; Catbalogan City, Samar; Gen. Mc Arthur, Salcedo and Guiuan Eastern Samar; Naval, Biliran; Catarman, Northern Samar; Palo and Pastrana, Leyte; Intensity IV - Abuyog, Hilongos, Javier, Capoocan, Julieta, Baybay, Barogo, Jaro, MacArthur, Matalum, Villaba, Leyte; San Francisco, Southern Leyte; Bislig City, Surigao Del Sur; Iloilo City; Naga City; Sorsogon City; Panganiban, Catanduanes; Intensity III - Binalbagan, Negros Occidental; Cabalian, Southern Leyte; Dimasalang, Masbate; Butuan City; Cabadbaran City; Intensity II - Bago City; Bacolod City; Samar, Philippines.

An aftershock of 4.6 was reported by PHIVOLCS to have been felt with intensity II in Catarman, Northern Samar; Leyte, Leyte, Philippines.

 

The last earthquake in Samar within about 150 km of this epicenter with M>=6.5 occurred on April 21, 1995 with M 6.8 and 7.1. An M 6.5 hit the area northeast of this on November 18, 2003.  Forecast 115059 had expected today's activity around April 16.

 

O: 23APR2019 06:41:14  11.7N  125.2E mb=4.8  EMSC   SAMAR, PHILIPPINES           

O: 23APR2019 05:37:51  11.8N  125.3E MS=6.5  PHI  Felt with intensity VI

O: 23APR2019 06:41:12  11.9N  125.3E MS=4.6  PHI  Felt with intensity II

O: 23APR2019 05:37:53  11.8N  125.2E Mw=6.4  EMSC   SAMAR, PHILIPPINES           

P: 16APR2019 115059    12.0N  124.0E 3.5-5.1 CAAAA  Luzon, Philippines         

 

An earthquake of M 6.0 also occurred today in the South Sandwich Islands continuing strong seismicity in that area this month which has included events of M 6.5 on April 5 and 9 and M 5.5 on April 16. None of these events have been reported felt in this remote area. Today's event occurred near local solar noon and may have been promoted by high tidal stresses. Forecast 115291 had expected this activity in the South Sandwich Islands around April 18-20.

 

O: 22APR2019 14:49:07  56.3S   27.5W Mw=6.0  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 18APR2019 115291    56.0S   26.0W 4.0-5.6 BAAAA  So. Sandwich Islands       

P: 20APR2019 115291    55.0S   29.0W 4.0-5.7 ABAAA  So. Sandwich Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 5.5 in the Vancouver Island area of British Columbia, Canada NEIC reported it was lightly felt in Port Hardy, B.C. and in Walnut Grove and Nanaimo, B.C. and as far as Bellingham, Washington. The M 5.5 was preceded about an hour earlier by an M 4.9. These events occurred within about an hour of local solar noon and were probably promoted by high tidal stresses associated with the full moon. The last earthquake within about  150 km of today's epicenter with M>=5.5 in the Vancouver Island region occurred with M 6.5 on October 22, 2018 and prior to that an M 5.5 on March 18, 2016 more that three years ago. Forecast 115209 had expected a moderately large quake was possible in this area in mid-April. This epicenter is at 102 degrees from the M 6.8 in Sulawesi of April 12, the last major earthquake in the world and was probably promoted by concentrated energy from that source.

 

O: 22APR2019 21:44:44  50.3N  130.2W Mw=5.5  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 22APR2019 21:44:45  50.3N  130.1W mw=5.5  ANSS   Port Hardy Canada

O: 22APR2019 20:26:59  50.4N  130.0W Mw=4.9  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 16APR2019 115209    50.7N  130.5W 3.0-5.2 CAAAA  British Colombia           

 

A moderately strong earthquake of M 5.4 also rocked areas of Central Mexico today. This event in Oaxaca State was felt with intensity II-III as far as 400 km from the epicenter (NEIC) at Oaxaca, Tlaxcatancingo, Puebla, Tres Marias, Zacamulpa, Mexico City And Naucalpan, Mexico among others.  An earthquake of M 4.3 in eastern Oaxaca occurred earlier in the day. This event was reported by NEIC to have been felt with intensity IV in Xadani, Oaxaca and II-III in Huatulco, Pochutta, Oaxaca, Mexico. The M 5.4 is the strongest within about 100 km of this epicenter since an M 5.9 on February 19, 2018, an aftershock of an M 7.2 on February 16, 2018.  Forecast 115068 had expected this activity within about 100 km was likely around April 19.

 

O: 22APR2019 16:29:45  15.9N   98.8W ML=4.1  EMSC   OFFSHORE GUERRERO, MEXICO

O: 22APR2019 18:00:01  15.9N   98.8W ML=4.5  EMSC   OFFSHORE GUERRERO, MEXICO

O: 23APR2019 05:46:03  16.0N   98.7W ML=4.0  EMSC   OFFSHORE GUERRERO, MEXICO

O: 23APR2019 05:30:42  16.0N   98.7W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 22APR2019 21:49:04  16.0N   98.7W ML=4.1  EMSC   OFFSHORE GUERRERO, MEXICO

O: 22APR2019 23:22:39  16.0N   98.7W ML=4.1  EMSC   OFFSHORE GUERRERO, MEXICO

O: 22APR2019 21:46:42  16.1N   98.7W ML=4.0  EMSC   OFFSHORE GUERRERO, MEXICO

O: 22APR2019 17:56:50  16.1N   98.7W ML=4.3  EMSC   OFFSHORE GUERRERO, MEXICO

O: 23APR2019 06:32:19  16.3N   98.5W ML=4.1  EMSC   OAXACA, MEXICO

O: 22APR2019 20:15:26  16.4N   98.4W Mw=5.4  EMSC   OAXACA, MEXICO

O: 22APR2019 20:45:27  16.4N   98.5W mb=4.5  EMSC   GUERRERO, MEXICO             

P: 19APR2019 115068    17.0N   98.0W 3.5-5.3 BAAAA  Oaxaca, Mexico              

 

TIDAL STRESSES, OTHER PROMOTERS MAY BRING ENHANCED GLOBAL SEISMICITY

 

EARTHQUAKE SUMMARY FOR APRIL 21, 2019

 

The current lull in global seismicity continued today. A geomagnetic storm is on the horizon and two ocean storms show promise to become tropical cyclones. This activity is likely to combine with the full moon tides to promote enhanced seismicity as noted in previous summaries:

 

"The full moon will arrive at 11:12 UT on April 19, 2019. Longitudes which are sub-solar at this time are near 15 East and 165 West. These include areas of central and western Europe in the east and the Aleutian Islands and western Alaska in the West. Other areas which may see enhanced tidal promotion at this time are the Kermadec-Tonga arc north to Samoa. While these regions will experience maximum stress from the tidal alignment, many other areas could see enhanced seismicity in the next five days and a strong earthquake is likely in this time period." (April 19-22, 2019)

 

The strongest earthquake in the world today occurred in the Tonga/Fiji zone and was likely promoted by tidal stresses. This event of M 5.4 southeast of the Loyalty Islands was somewhat unusual. The last earthquake of M>=5.4 within about 250 km of this epicenter occurred nearly two years ago as an M 5.7 on July 8, 2017. A strong M 7.2 hit the area about 200 km to the west on August 12, 2016. Forecast 115264 had expected regional seismicity in the Loyalty Islands in mid April.

 

O: 22APR2019 04:38:03  22.1S  170.0E mb=4.7  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O: 21APR2019 09:24:41  22.1S  174.9E Mw=5.4  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 16APR2019 115264    23.0S  170.0E 4.0-5.8 BAAAA  Loyalty Islands            

 

An earthquake of M 4.5 continued the activity in the Mayotte region east of Africa today. The current Mayotte series began a year ago on May 13, 2018i with an M 5.1. The last event of M>=4.5 in the area was an M 5.0 on April 5, 2019. Forecast 115248 had expected activity in the region was likely around April 22. A new tropical cyclone to the northeast of this may have helped promote today's activity as noted in this summary:

 

"A tropical cyclone may be forming in the area north of Madagascar. This system is currently located near 10S 51E with winds up to 30 kts and moving westward at 6 kts. The area of Mayotte may be active as this storm approaches." (April 21-22, 2019)

 

NEIC reported this earthquake of M 4.5 in Mayotte was felt with intensity II-III in the area(s) of Mamoudzou, Mayotte.

 

O: 22APR2019 04:27:43  12.8S   45.4E mb=4.5  EMSC   MAYOTTE REGION               

P: 18APR2019 115248    14.0S   44.0E 3.0-4.4 BBBAA  Madagascar area            

 

The strongest earthquakes in the U.S. or Canada today occurred in Central  Alaska and in Central California with M 3.4-3.5. The M 3.4 in Central Alaska

was felt lightly in the epicentral area.  It is the strongest event within about 150 km of this epicenter since an M 3.7 on January 17, 2019 and prior to that an M 3.6 on November 30, 2018. These occurred about 150 km north of today's epicenter. Forecast 115234 had expected today's activity within about 25 km of the epicenter was likely around April 19.

 

O: 22APR2019 02:04:32  62.7N  148.7W ML=3.4  EMSC   CENTRAL ALASKA               

P: 19APR2019 115234    62.8N  149.1W 3.2-4.9 BAAAA  Central Alaska              

 

The M 3.5 in Central California was felt widely in the area.  NEIC reported this earthquake of M 3.5 in Central California was felt with intensity IV in Carmel Valley,  California and II-III in the area(s) of California at Gonzales, Soledad, Paicines, Hollister, Salinas, San Juan Bautista, Greenfield.  This is the strongest earthquake within about 50 km of this epicenter in nearly half a year - since an M 3.6 and 4.1 on November 2, 2018. Events of M 3.5 hit the area on November 10, 2018, an aftershock of the November 2 event and with M 3.8 on October 5, 2018, a foreshock, the only such events in the past year. Forecast 115100 had expected today's event within about 25 km of this epicenter was likely in mid-April.

 

O: 22APR2019 05:45:09  36.6N  121.2W Ml=3.5  EMSC   CENTRAL CALIFORNIA           

P: 16APR2019 115100    36.7N  121.4W 2.5-4.4 CAAAA  Central California         

 

SWARM HITS KOMANDORSKY ISLANDS, RUSSIA

 

EARTHQUAKE SUMMARY FOR APRIL 20, 2019

 

Quiet global seismic conditions continued today. The strongest earthquake of the day was an M 5.3 in the Komandorsky Islands of Russia. It was part of a swarm in the area including two events of M 4.8. The M 5.3 is the strongest earthquake within about 200 km of this epicenter in the Komandorsky Islands since an  M 5.4 on January 3, 2019 and prior to that an M 7.3 and aftershocks of December 20, 2018. Forecast 115214 had expected this activity in the Komandorsky Islands was likely around April 14-20. None of these events were reported felt in this remote area.

 

O: 21APR2019 01:38:55  54.8N  164.7E mb=4.0  EMSC   KOMANDORSKIYE OSTROVA REGION 

O: 21APR2019 00:50:27  54.8N  164.7E mb=4.2  EMSC   KOMANDORSKIYE OSTROVA REGION 

O: 20APR2019 22:12:16  54.8N  164.7E mb=4.8  EMSC   KOMANDORSKIYE OSTROVA REGION 

O: 20APR2019 22:34:39  54.9N  164.7E Mw=5.3  EMSC   KOMANDORSKIYE OSTROVA REGION 

O: 20APR2019 22:46:36  54.9N  164.7E mb=4.8  EMSC   KOMANDORSKIYE OSTROVA REGION 

P: 14APR2019 115214    55.0N  165.0E 4.0-5.9 CAAAA  Komandorsky Isl            

P: 20APR2019 115214    55.0N  169.0E 4.0-5.9 AACAA  Near Islands               

 

The strongest earthquake in the U.S., Canada or vicinity today was an M 5.1 in the western Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote epicentral area. This is the strongest earthquake reported within about 150 km of this epicenter since an M 5.9 on January 5, 2019 and prior to that an M 6.3 on August 23, 2018. Forecast 115206 had expected today's event within this area was likely around April 19.

 

 

O: 20APR2019 20:49:23  50.4N  179.0W mb=3.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 21APR2019 06:31:38  51.6N  178.3W mb=5.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 21APR2019 06:31:38  51.4N  178.2W mb=5.2  ANSS   ANDREANOF ISLANDS, ALEUTIAN IS

P: 19APR2019 115206    51.9N  179.8W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

An M 4.5 also occurred today in Northern Baja, Mexico. NEIC reported it was felt with intensity II-III in Northern Baja California at San Felipe, Ensenada, Jacumba, Primo Tapia and in portions of Southern California with lesser intensity. This is the strongest earthquake within about 100 km of this epicenter in Baja Mexico since an M 4.6 more than five years ago on December 20, 2013. An M 4.8 about  150 km northeast of this occurred on November 19, 2018.

Forecast 115133 had expected activity up to M 5.5 in this region in mid-April.

 

O: 20APR2019 14:41:50  31.2N  115.8W Mw=4.5  EMSC   BAJA CALIFORNIA, MEXICO      

O: 20APR2019 07:28:16  32.5N  115.6W Ml=2.1  EMSC   BAJA CALIFORNIA, MEXICO      

P: 13APR2019 115133    32.9N  115.6W 2.5-4.4 CAAAA  So. California             

 

RELAXED SEISMICITY; QUIET DAY

 

EARTHQUAKE SUMMARY FOR APRIL 19, 2019

 

Global seismicity was quiet today. There were no significant earthquakes recorded in the Western Hemisphere and only a few of M 5.0-5.2, mostly in the Solomon Islands and southwest Pacific in the Eastern Hemisphere. While the full moon arrived today, with the lack of ocean storm and solar and geomagnetic conditions at very quiet levels, the tidal stresses may not be sufficient to help promote strong seismicity at this time. The tidal forecast had read:

 

 

"The full moon will arrive at 11:12 UT on April 19, 2019. Longitudes which are sub-solar at this time are near 15 East and 165 West. These include areas of central and western Europe in the east and the Aleutian Islands and western Alaska in the West. Other areas which may see enhanced tidal promotion at this time are the Kermadec-Tonga arc north to Samoa. While these regions will experience maximum stress from the tidal alignment, many other areas could see enhanced seismicity in the next five days and a strong earthquake is likely in this time period." (April 19-21, 2019)

 

The strongest earthquake of the day was an M 5.2-5.3 in Mindanao, Philippines. It was not reported felt in the epicentral area of Mindanao. Forecast 115022 had expected this event within about 150 km of the epicenter was likely around April 19.

 

O: 19APR2019 07:08:19   5.5N  125.7E ML=4.2  EMSC   MINDANAO, PHILIPPINES        

O: 19APR2019 07:29:58   5.5N  126.8E Mw=5.2  EMSC   MINDANAO, PHILIPPINES        

O: 19APR2019 07:29:53   5.2N  127.0E MS=5.3  PHI  Not reported felt.             

P: 19APR2019 115022     4.0N  126.0E 4.0-5.6 ABAAA  Mindanao, Philippines      

 

O: 20APR2019 03:48:21  10.3S  161.2E mb=5.0  EMSC   SOLOMON ISLANDS              

P: 21APR2019 115249    10.0S  162.0E 4.0-5.4 AAAAA  No. of Santa Cruz Islands  

 

O: 19APR2019 23:02:53  18.4S  177.7W Mw=5.0  EMSC   FIJI REGION                  

P: 18APR2019 115257    19.0S  175.0W 4.0-5.8 AACAA  Tonga Islands              

 

O: 20APR2019 06:52:10  25.5S  179.6E mb=4.9  EMSC   SOUTH OF FIJI ISLANDS        

P: 12APR2019 115271    23.0S  179.0E 4.0-5.7 CCAAA  Tonga/Fiji                 

 

STRONG QUAKE SOUTH OF AUSTRALIA

 

EARTHQUAKE SUMMARY FOR APRIL 18, 2019

 

The strongest earthquake in the world today was an M 6.5 in the Western Antarctic-Indian Ridge south of Australia. It was not reported felt in this remote area. This is the largest earthquake on the Western Indian-Antarctic Ridge within about 300 km of this epicenter since an M 6.6 on June 11, 2000, the only other such event in the area in at least 30 years. Forecast 115288 had expected activity on the Ridge was likely around April 21.

 

O: 18APR2019 14:46:01  51.1S  139.5E Mw=6.5  EMSC   WESTERN INDIAN-ANTARCTIC RIDGE

P: 21APR2019 115288    49.0S  122.0E 4.0-5.6 BBCAA  So. of Australia           

 

The largest earthquake in the U.S. or Canada today was an M 3.4 in Hawaii. NEIC reported this earthquake of M 3.4 in Hawaii was felt with intensity II-III in the area(s) of Kailua Kona, Waikoloa, Kamuela, Holualoa, Dealakekua, Honaunau, Captain Cook, Naalehu and Kailua, Hawaii. This is the strongest tectonic earthquake in Hawaii since an M 5.2-5.3 occurred several days ago on April 14, 2019 and prior to that an M 3.4 on March 31, 2019. It may have been promoted by tidal effects associated with the full moon as it occurred near local solar noon but is probably an aftershock of the April 14 event as it occurred at the same epicenter. Forecast 115056 had expected this activity was likely around April 15. The tidal forecast had noted maximum tides near the longitude of Hawaii at this time as:

 

"The full moon will arrive at 11:12 UT on April 19, 2019. Longitudes which are sub-solar at this time are near 15 East and 165 West. These include areas of central and western Europe in the east and the Aleutian Islands and western Alaska in the West. Other areas which may see enhanced tidal promotion at this time are the Kermadec-Tonga arc north to Samoa. While these regions will experience maximum stress from the tidal alignment, many other areas could see enhanced seismicity in the next five days and a strong earthquake is likely in this time period." (April 19-21, 2019)

 

O: 19APR2019 00:27:58  19.8N  155.8W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII     

P: 15APR2019 115056    19.2N  155.2W 3.0-4.4 BAAAA  Hawaii                     

 

Unusual earthquakes which may have been promoted by the full moon today included

an M 4.3 in South Korea; an M 4.5 in the DR Congo and an M 3.7 in Sarawak, Indonesia. The events in the Congo and  in South Korea occurred  near local solar noon, a time when tidal stresses with full moon maximize. Forecast 115033 had expected a moderate quake in the Congo region within about  200 km of today's epicenter in mid-April.

 

O: 18APR2019 08:18:27   0.8S   27.5E mb=4.5  EMSC   DEMOCRATIC REPUBLIC OF THE CON

P: 14APR2019 115033     2.0S   29.0E 3.0-4.9 BBBAA  Lake Victoria area         

 

O: 19APR2019 02:16:43  37.9N  129.5E ML=4.3  EMSC   SOUTH KOREA                  

P: 18APR2019 115115    32.0N  132.0E 3.5-4.9 ACBAA  Kyushu, Japan area         

 

O: 18APR2019 20:48:38   1.9N  111.5E ML=3.8  EMSC   SARAWAK, MALAYSIA            

 

STRONG QUAKE RATTLES TAIWAN

 

EARTHQUAKE SUMMARY FOR APRIL 17, 2019

 

A strong earthquake of M 6.1 shook most of Taiwan today. High-rise buildings in Taipei swayed during the quake. NEIC reported maximum intensit VI in Hualien, Taipei, and Miaoli and IV in Ilan, Taichung with lesser shaking in Hsinchu Counties, Taiwan. CWB reported this earthquake was felt with intensity VII in Hualien; V in Nantou, Yilan, Taichung, Taipei; IV in Taoyuan, Hsnichu, Miaoli, Changhua; III in Chiayi, Yunlin, Taitung; II in Kaohsiung, Tainan and Penghu and I in Pingtung Counties, Taiwan. The M 4.1 aftershock was felt with intensity V in Hualien; III in Nantou and II in Taichung and Yilan Counties, Taiwan. More than a dozen people were reported injured in this earthquake which stopped public transportation. Two hikers were injured by rock slides and at least 15 were injured by falling debris in the area of Taipei. The China Earthquake Networks Center gave the event M 6.7. Schools were closed and some roads were shut down for inspection. At least two building were evacuated due to structural damage. Today's M 6.1 occurred within about an hour of local solar noon when Taiwan was near the sub-solar point on the earth (the point where the sun is directly overhead at local solar noon). It was probably promoted by strong tidal stresses associated with the full moon which occurs tomorrow. These maximize near this hour. A moderate foreshock hit the same epicenter on April 9, 2019 following a series of moderate regional events in early April.  Today's event of M 6.1 is the strongest in Taiwan since an M 6.4 on February 6, 2018 – that followed an M 6.1 on February 4, 2018, earthquakes which occurred about 25 km north of today's epicenter. These were the largest in Taiwan since February 5, 2016 when an M 6.4 hit the area southwest of today's activity. Forecast 115091 had expected today's event within about 50 km of the epicenter was likely around April 18.

 

O: 18APR2019 05:17:26  24.1N  121.5E ML=4.1  EMSC   TAIWAN                       

O: 18APR2019 05:01:07  24.1N  121.5E ML=6.1  TAI    Hualien, Taiwan              

O: 18APR2019 05:01:06  24.0N  121.7E mw=6.1  ANSS   E of Hualian Taiwan

O: 18APR2019 05:17:27  24.1N  121.5E ML=4.1  TAI    Hualien, Taiwan              

O: 18APR2019 05:01:06  24.1N  121.5E Mw=6.1  EMSC   TAIWAN                       

P: 18APR2019 115091    24.0N  121.0E 4.0-5.4 AAAAA  Taiwan                     

 

An earthquake of M 5.6 in Central Chile preceded the M 6.1 in Taiwan by about an hour. NEIC reported it was felt with intensity V in Coquimbo; IV in La Serena and Vicuna and II-III in Salamanca, Villa Alemana, Lampa and Santiago, Chile. CSN reported this earthquake was felt with intensity VI in  Coquimbo at La Higuera, La Serena; V in Monte Patria, Ovalle, Paiguano, Vicuna; IV in Punitaqui, Salamanca; Canela, Combarbala, Coquimbo; III in Illapel and Andacollo; Atacama with V in Freirina, Huasco and Vallenar IV in Alto del Carmen, Copiapo and Tierra Amarilla and III in Caldera, Chile. This event occurred within less than an hour of local solar midnight and may have been promoted by stresses associated with the full moon alignment which maximizes on April 19. Two events of M>=5.6 have occurred within about 200  km of today's epicenter in the past year - an M 5.7 on March 7, 2019 and an M 6.7 on January 20, 2019. Forecast 115262 had expected today's earthquake was likely within about 50 km of this epicenter around April 19.

 

O: 18APR2019 04:06:33  29.3S   71.6W Mw=5.6  EMSC   OFFSHORE COQUIMBO, CHILE     

O: 18APR2019 04:06     29.4S   71.6W mb=5.6  GUC    Coquimbo at La Higuera, La Ser

P: 19APR2019 115262    29.0S   72.0W 4.0-5.5 AAAAA  Coast Central Chile        

 

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the Fox Islands, Aleutians, Alaska. As it occurred within a few degrees longitude of the maximum tidal stresses  associated with the upcoming full moon it may have been promoted by that alignment as noted in this summary:

 

"The full moon will arrive at 11:12 UT on April 19, 2019. Longitudes which are sub-solar at this time are near 15 East and 165 West. These include areas of central and western Europe in the east and the Aleutian Islands and western Alaska in the West. Other areas which may see enhanced tidal promotion at this time are the Kermadec-Tonga arc north to Samoa. While these regions will experience maximum stress from the tidal alignment, many other areas could see enhanced seismicity in the next five days and a strong earthquake is likely in this time period." (April 17-18, 2019)

 

Two earthquakes of M>=4.9 have occurred within the Fox Islands within about 150 km of this epicenter in the past 1.5 years - an M 5.1 on January 28, 2018 more than a year ago and an M 4.9 on December 10, 2017. The last such event of significantly larger magnitude was an M 5.3 on August 9, 2017. Forecast 116212 had expected a moderate earthquake in this area around April 17.

 

O: 18APR2019 02:44:39  52.3N  168.5W mb=4.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 17APR2019 115212    53.6N  166.1W 3.5-5.1 ABBAA  Fox Islands, Aleutians     

 

MODERATE QUAKES HIT SOUTHERN OCEAN AREAS

 

EARTHQUAKE SUMMARY FOR APRIL 16, 2019

 

A series of moderate earthquakes of M 5.5-5.8 hit across the Southern Oceans today. The strongest of these were a series in the central Kermadec Islands of New Zealand (M 5.5, 5.7, 5.8) An M 5.7 also occurred on the opposite side of the world in the southern Atlantic near Tristan da Cunha (M 5.7) and to the south of this in the South Sandwich Islands (M 5.5).

 

The strongest of the activity in the southern oceans today was a series of moderately large events in the Kermadec Islands of northern New Zealand of M 5.0, 5.5, 5.7 and 5.8. This is a sparsely populated region and earthquakes are seldom reported felt by the local population. A series of moderately large to large quakes has hit the area in recent week, the largest of which was an M 6.4 on March  6, 2019. Forecast 115282 had expected today's activity was likely around April 18.

 

O: 16APR2019 09:39:37  30.9S  178.8W Mw=5.7  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 16APR2019 09:22:32  31.1S  179.0W Mw=5.8  EMSC   KERMADEC ISLANDS REGION      

P: 18APR2019 115282    32.0S  179.0W 4.0-5.5 AAAAA  So. Kermadec Islands       

 

O: 17APR2019 05:03:42  31.8S  179.9E mb=5.0  EMSC   KERMADEC ISLANDS REGION      

O: 16APR2019 16:01:15  32.4S  179.4W Mw=5.5  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 18APR2019 115282    32.0S  179.0W 4.0-5.5 AAAAA  So. Kermadec Islands       

 

The earthquake in Tristan da Cunha area of the South Atlantic was also not felt in this remote area. It is the strongest earthquake within about 300 km of this epicenter since an M 5.7 on July 2, 2015. That event was an aftershock of the strongest quake in the area in at least 30 years - an M 7.0 on June 17, 2015.

 

O: 16APR2019 07:30:39  35.3S   15.5W mb=5.7  EMSC   TRISTAN DA CUNHA REGION      

 

The M 5.5 in the eastern South Sandwich Islands continued strong seismicity in that area during the current month. This was not felt in this remote area.  It is the strongest earthquake within about 100 km of this epicenter since an M 5.7 on December 10, 2015. An M 6.5 hit about 100 km west of this on April 9, 2019. Today's event is probably a regional aftershock of the M 6.5. Forecast 115293 had expected activity in  this area was likely with magnitude up to M 5.5 around April 18.

 

O: 16APR2019 16:59:16  58.7S   23.7W mb=5.5  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 18APR2019 115293    61.0S   26.0W 4.0-5.5 ACBAA  Southern  Ocean            

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the western Andreanof Islands. It was not reported felt in this remote area. The last earthquake with M>=4.2 in the western Andreanof Islands occurred on March 22, 2019 with M 4.8. Ten such quakes have occurred in this area during 2019. Forecast 115206 had expected today's event within about 50 km of this epicenter was likely around April 19.

 

O: 16APR2019 21:31:00  50.9N  179.4W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 19APR2019 115206    50.5N  179.8W 3.5-5.3 BAAAA  Andreanoff Isls, Aleutians 

 

NORTHERN CALIFORNIA ACTIVE

 

EARTHQUAKE SUMMARY FOR APRIL 15, 2019

 

A pair of moderate earthquakes occurred in northern California today - an M 4.1 in the Geysers area north of San Francisco and an M 4.2 and foreshocks in the Bishop/Mammoth Lakes area near the central Nevada border. This summary has previously argued that seismicity in California peaks in mid-April to early May and this appears to confirm that analysis.

 

An M 4.2 was widely felt in the Mammoth Lakes region of central California today. NEIC reported intensity II-III in Bishop, Mammoth Lakes, Shaver Lake, Auberry, Squaw Valley, Yosemite and El Portal, California. An M 3.4 foreshock two minutes earlier was felt with intensity III in Bishop. Smaller foreshocks earlier in the day were also felt lightly in Bishop, California. The last earthquake in the Bishop/Mammoth Lakes region of M>=4.2 occurred on December 28, 2016 when an M 5.7 about 100 km northwest of today's event was followed by a series of aftershocks of M 5.6 and 5.7. The last such event in the Bishop area occurred more than three years ato on February 16, 2016.  Forecasts 115095 and 115098 had expected this activity was likely around April 13.

 

O: 15APR2019 18:24:08  37.4N  118.5W Md=2.0  EMSC   CENTRAL CALIFORNIA

O: 15APR2019 18:07:26  37.4N  118.5W Md=2.2  EMSC   CENTRAL CALIFORNIA

O: 15APR2019 19:04:36  37.4N  118.5W Md=2.2  EMSC   CENTRAL CALIFORNIA

O: 16APR2019 01:09:44  37.4N  118.5W Md=2.7  EMSC   CENTRAL CALIFORNIA

O: 15APR2019 14:19:16  37.4N  118.5W Md=2.9  EMSC   CENTRAL CALIFORNIA

O: 15APR2019 22:39:17  37.4N  118.5W Mh=2.1  EMSC   CENTRAL CALIFORNIA

O: 15APR2019 15:58:47  37.4N  118.5W Mw=3.4  EMSC   CENTRAL CALIFORNIA

O: 15APR2019 12:20:25  37.4N  118.5W ml=2.2  EMSC   CENTRAL CALIFORNIA

O: 15APR2019 17:55:58  37.4N  118.5W ML=4.2  EMSC   CENTRAL CALIFORNIA           

P: 13APR2019 115095    37.3N  119.4W 2.5-4.6 AAAAA  California/Nevada area     

P: 13APR2019 115098    38.4N  118.2W 2.5-4.4 AAAAA  California/Nevada area     

 

The last event in the Geysers area of northern California with M>=4.1 was an M 4.2 on May 10, 2018. The last of larger magnitude was an M 5.0 on December 14, 2016. Forecast 115102 had expected this event within about 15 km of the epicenter was likely around April 13.

 

O: 15APR2019 12:10:26  38.8N  122.8W Md=2.0  EMSC   NORTHERN CALIFORNIA

O: 15APR2019 13:06:39  38.8N  122.8W Md=2.0  EMSC   NORTHERN CALIFORNIA

O: 15APR2019 11:56:18  38.8N  122.8W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 15APR2019 12:05:26  38.8N  122.8W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 15APR2019 15:18:47  38.8N  122.8W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 16APR2019 01:23:14  38.8N  122.8W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 15APR2019 11:54:03  38.8N  122.8W mw=4.1  ANSS   NW of The Geysers

O: 15APR2019 11:54:03  38.8N  122.8W Mw=4.1  EMSC   NORTHERN CALIFORNIA          

P: 13APR2019 115102    38.7N  122.7W 2.5-4.6 AAAAA  Central California         

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in Northern Alaska. NEIC reported it was felt with intensity II-III in Alaska at Huslia and Hughes. Moderate earthquakes in this area began on February 10, 2019 with M 4.8. Aftershocks of M 5.2 later occurred on March 6 and March 26, 2019. Forecast 115227 had expected this area would be active in mid-April.

 

O: 16APR2019 05:07:47  66.3N  157.2W ML=4.7  EMSC   NORTHERN ALASKA

O: 16APR2019 06:22:15  66.3N  157.5W ml=3.0  EMSC   NORTHERN ALASKA

O: 16APR2019 05:35:46  66.3N  157.5W ml=3.1  EMSC   NORTHERN ALASKA

O: 16APR2019 05:18:10  66.3N  157.0W ml=3.1  EMSC   NORTHERN ALASKA              

P: 14APR2019 115227    65.1N  154.4W 3.2-5.1 ABBAA  Northern Alaska            

 

MODERATE EVENTS IN NORTHERN PHIIPPINES; RAT ISLANDS, ALEUTIANS

 

EARTHQUAKE SUMMARY FOR APRIL 14, 2019

 

It was a relatively quiet day in global seismicity. The strongest earthquakes were of M 5.2-5.3 and occurred in the northern Philippines and in the Rat Islands, Aleutians, Alaska.  PHIVOLCS reported the earthquake in the northern Philippines was felt with intensity IV in Calayan, Cagayan, III in Pasuquin, Pagudpud, Bangui, Adams and Laoag, Ilocos Norte and II in Sinait, Ilocos Sur; Bacarra, Currimao, Badoc and Burgos, Ilocos, Norte, Philippines

An event of M 5.6 hit about 100 km southwest of today's epicenter on March 2, 2019 and an M 5.5 occurred at today's epicenter on January 24, 2019. Today's event is the strongest aftershock to date of the January event. Forecasts 115060 and 115090 had expected today's activity was likly in mid-April.

 

O: 15APR2019 01:33:00  19.2N  121.1E Mw=5.1  EMSC   BABUYAN ISL REGION, PHILIPPINE

O: 15APR2019 01:32:59  19.2N  120.9E MS=5.2  PHI  Felt with intensity IV

P: 13APR2019 115060    18.0N  120.0E 3.5-4.9 ABAAA  Luzon, Philippines         

P: 20APR2019 115090    20.0N  121.0E 4.0-5.4 BAAAA  Taiwan                     

 

The strongest earthquake in the U.S., Canada or the world today was an M 5.3 in the Rat Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last earthquake within about 200 km of this epicenter in the Rat Islands with M>=5.3 occurred on April 2, 2019 with M 6.4 and prior to that an M 6.6 on October 8, 2017. Today's event is probably an aftershock of the April 2 M 6.4.   Forecast 114938 had expected today's event within about 10 km of the epicenter was likely around April 11. This epicenter is at 101 degrees from the M 7.5 in Ecuador of February 22, 2019 and may have been promoted by concentrated energy from that event.

 

O: 14APR2019 15:30:36  52.0N  178.1E Mw=5.3  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 11APR2019 114938    52.0N  178.0E 4.0-6.0 BAAAA  Rat Islands                

 

DERATE EARTHQUAKE SHAKES HAWAII

 

EARTHQUAKE SUMMARY FOR APRIL 13, 2019

 

The strongest earthquake in the U.S. or Canada today was an M 5.3 in the Island of Hawaii. NEIC reported it was felt with moderate intensity V in Hawaii at Kailua Kona, Holualoa, Waikoloa, Kealakekua, Captain Cook; IV in Kamuela, Paauilo, Honokaa, Kapaau, and lesser intensity within about 300 km of the epicenter. Several aftershocks were also reported felt with light to moderate intensity. The last tectonic (as opposed to volcanic) earthquake in Hawaii of M>=5.3 within about 150 km of this epicenter occurred a month ago as an M 5.5 on March 13, 2019 and prior to that an M 6.1 and M 6.7 on October 15, 2006. Forecast 115056 had expected a moderate earthquake in the area around April 15.

 

O: 14APR2019 03:09:00  19.7N  156.0W Mw=5.1  EMSC   ISLAND OF HAWAII, HAWAII     

O: 14APR2019 03:09:00  19.7N  155.8W Mw=5.3  ANSS   ISLAND OF HAWAII, HAWAII     

P: 15APR2019 115056    19.2N  155.2W 3.0-4.4 AAAAA  Hawaii                     

 

A moderate M 4.1 also occurred today in central Utah. This is the strongest earthquake in the area within about 100 km of the epicenter since an M 4.3 on January 15, 2016 and prior to that an M 4.1 on July 4, 2015. An M 4.0 occurred about 30 km to the east of this on February 20, 2019, the latest moderate event in the area. Forecast 115155 had expected today's evnet was likely within about 25 km of this epicenter around April 16.

 

O: 14APR2019 04:09:17  38.8N  112.8W ML=2.9  EMSC   UTAH                         

O: 14APR2019 03:59:54  38.8N  112.8W ML=4.0  EMSC   UTAH                         

O: 14APR2019 03:59:54  38.8N  112.8W ML=4.1  ANSS   UTAH                         

P: 16APR2019 115155    38.6N  112.7W 2.0-4.3 AAAAA  Utah area                  

 

The most active area in the world today was the Ryukyu Islands, Japan where a swarm of moderate events continued today. The largest of these were M 5.0, 5.0 and 5.2. The last event of M>=5.2 within about 150 km of this activity occurred as an M 5.5 on April 8, 2019.  NEIC reported today's earthquake of M 5.2 in the Ryukyu Islands, Japan was felt with intensity II-III in the area(s) of Okinawa at Ginowan, Okinawa and Yomitan, Japan.  Forecast 114829 had expected this activity in this area in early April. A foreshock of M 5.5 on April 8, 2019 was the only such event in the region since September 22, 2018 (M 5.4).

 

O: 13APR2019 08:59:34  26.1N  129.5E mb=4.6  EMSC   RYUKYU ISLANDS, JAPAN        

O: 14APR2019 05:11:58  26.2N  129.4E mb=4.8  EMSC   RYUKYU ISLANDS, JAPAN        

O: 13APR2019 07:08:14  26.2N  129.5E Mw=4.9  EMSC   RYUKYU ISLANDS, JAPAN        

O: 13APR2019 07:11:00  26.2N  129.5E Mw=5.0  EMSC   RYUKYU ISLANDS, JAPAN        

O: 13APR2019 15:07:01  26.2N  129.5E mb=5.0  EMSC   RYUKYU ISLANDS, JAPAN         

O: 14APR2019 05:40:26  26.3N  129.4E mb=4.8  EMSC   RYUKYU ISLANDS, JAPAN        

O: 13APR2019 07:14:29  26.3N  129.5E Mw=4.9  EMSC   RYUKYU ISLANDS, JAPAN        

O: 14APR2019 01:53:10  26.3N  129.5E Mw=5.2  EMSC   RYUKYU ISLANDS, JAPAN        

O: 13APR2019 08:17:56  26.3N  129.5E mb=4.6  EMSC   RYUKYU ISLANDS, JAPAN        

P:  7APR2019 114829    26.0N  128.0E 4.0-5.4 CAAAA  Ryukyu Islands             

 

 

STRONG QUAKE SHAKES SULAWESI, INDONESIA

 

EARTHQUAKE SUMMARY FOR APRIL 12, 2019

 

A strong M 6.8 earthquake hit the region of Sulawesi, Indonesia north of the Banda Sea. NEIC reported maximum intensity V in Sulawesi at Luwuk; IV in Palu and Makasar and II-III in Rantepao and Manado, Sulawesi. This was accompanied by strong regional seismicity the Banda Sea, Ceram, and Sulawesi. The M 6.8 is the strongest earthquake in the world since an M 7.0 on March 1, 2019 in Southern Peru. This epicenter in Sulawesi is north of the Banda Sea and is probably related to the passage of Tropical Cyclone Wallace directly to the south today. When an M 6.3-6.5 hit the Banda Sea of April 7, this summary noted:

 

"The earthquake of M 6.3 in the Banda Sea was not reported felt in that area. As noted, it occurred near the eye of Tropical Cyclone Wallace and was probably promoted from that source as noted in previous issues:

 

"A tropical cyclone may be forming in the Banda Sea, Indonesia. This system is currently located at 9S 130E with winds up to 33 kts and moving to the WSW at 9 kts. Some enhanced seismicity may accompany this storm in the Banda Sea area in the next several days." (April 3-4, 2019)

 

and

 

"Tropical cyclone Wallace continued in the Banda Sea, Indonesia with winds up to 55 kts. This system is currently moving to the WSW at 6 kts. Some enhanced seismicity may accompany this storm in the Banda Sea area in the next several days. This may include a strong earthquake." (April 5-6, 2019)

" (April 7, 2019)

 

and

 

"Tropical cyclone Wallace continued in the Banda Sea, Indonesia with winds up to 45 kts. Some enhanced seismicity may accompany this storm in the antipodal area of the eastern Caribbean in the Leeward Islands north to the Virgin Islands and Puerto Rico to the Dominican Republic. The current antipode is at 17N 67W in the Dominican Republic. Regional activity in the Banda Sea and Flores may also continue." (April 10-11, 2019)

 

Local authorities reported some minor damage from the quake. A tsunami warning was issued but later withdrawn when no waves were observed. Local residents took to the hills and returned when the warning was rescinded. The last earthquake within about 300 km of today's epicenter occurred as an M 7.6 on May 4, 2000. The only other such event in the past 30 years was an M 7.7 on November 29, 1998. An M 7.4-7.5 event also occurred about 350 km southeast of today's epicenter on October 19, 2001. Forecasts 114783, 115014 and 115045 had expected strong seismicity in this are was likely in mid-April within about 100 km of today's activity. The antipode near 2N 57W is in northeastern South America and is not a seismic area. No antipodal triggering is expected in this case but some seismic enhancement may occur in the Trinidad and Tobago area and to the east in the North Atlantic.

 

O: 13APR2019 02:29:49   1.7S  122.7E mb=4.2  EMSC   SULAWESI, INDONESIA

O: 12APR2019 20:25:55   1.8S  122.5E ML=4.2  EMSC   SULAWESI, INDONESIA

O: 12APR2019 18:35:52   1.8S  122.6E ML=4.1  EMSC   SULAWESI, INDONESIA

O: 12APR2019 13:10:09   1.8S  122.6E ML=4.5  EMSC   SULAWESI, INDONESIA

O: 12APR2019 20:15:09   1.8S  122.6E Mw=4.8  EMSC   SULAWESI, INDONESIA

O: 12APR2019 11:40:48   1.8S  122.6E Mw=6.8  EMSC   SULAWESI, INDONESIA

O: 12APR2019 18:23:18   1.8S  122.6E mb=4.4  EMSC   SULAWESI, INDONESIA

O: 13APR2019 05:26:17   1.8S  122.6E mb=4.8  EMSC   SULAWESI, INDONESIA

O: 12APR2019 22:39:31   1.8S  122.7E mb=4.3  EMSC   SULAWESI, INDONESIA

O: 12APR2019 12:12:12   1.8S  122.7E mb=5.1  EMSC   SULAWESI, INDONESIA

O: 12APR2019 15:57:06   1.9S  122.4E ML=4.1  EMSC   SULAWESI, INDONESIA

O: 12APR2019 17:03:29   1.9S  122.5E ML=4.0  EMSC   SULAWESI, INDONESIA

O: 12APR2019 23:37:28   1.9S  122.6E ML=4.1  EMSC   SULAWESI, INDONESIA

O: 12APR2019 13:31:36   1.9S  122.6E ML=4.4  EMSC   SULAWESI, INDONESIA

O: 13APR2019 04:23:28   1.9S  122.6E mb=4.5  EMSC   SULAWESI, INDONESIA

O: 12APR2019 15:08:29   1.9S  122.6E mb=4.6  EMSC   SULAWESI, INDONESIA

O: 12APR2019 22:59:29   1.9S  122.6E mb=4.8  EMSC   SULAWESI, INDONESIA

O: 12APR2019 12:33:03   2.0S  122.0E ML=4.1  EMSC   SULAWESI, INDONESIA

O: 12APR2019 22:29:44   2.0S  122.5E ML=4.0  EMSC   SULAWESI, INDONESIA

O: 12APR2019 15:23:58   2.0S  122.5E ML=4.1  EMSC   SULAWESI, INDONESIA

O: 12APR2019 19:01:56   2.0S  122.5E ML=4.4  EMSC   SULAWESI, INDONESIA

O: 12APR2019 12:14:58   2.0S  122.5E ML=4.8  EMSC   SULAWESI, INDONESIA

O: 12APR2019 12:03:54   2.0S  122.5E mb=4.7  EMSC   SULAWESI, INDONESIA

O: 13APR2019 04:44:24   2.0S  122.6E ML=4.0  EMSC   SULAWESI, INDONESIA

O: 12APR2019 15:02:57   2.0S  122.6E ML=4.1  EMSC   SULAWESI, INDONESIA

O: 12APR2019 13:00:17   2.0S  122.6E ML=4.4  EMSC   SULAWESI, INDONESIA

O: 12APR2019 13:23:41   2.0S  122.6E ML=4.5  EMSC   SULAWESI, INDONESIA

O: 13APR2019 00:22:21   2.0S  122.8E ML=4.6  EMSC   SULAWESI, INDONESIA

O: 12APR2019 22:49:03   2.1S  122.5E ML=4.4  EMSC   SULAWESI, INDONESIA

O: 12APR2019 17:30:23   2.1S  122.6E ML=4.0  EMSC   SULAWESI, INDONESIA

O: 12APR2019 14:26:49   2.1S  122.6E ML=4.2  EMSC   SULAWESI, INDONESIA

O: 12APR2019 15:59:53   2.1S  122.6E ML=4.7  EMSC   SULAWESI, INDONESIA

O: 12APR2019 15:37:03   2.1S  123.2E ML=4.1  EMSC   SULAWESI, INDONESIA

O: 12APR2019 13:29:40   2.2S  122.1E ML=4.1  EMSC   SULAWESI, INDONESIA

O: 12APR2019 11:40:49   1.9S  122.6E mw=6.8  ANSS   SSW of Luwuk Indonesia       

P: 11APR2019 114783     4.0S  123.0E 4.0-5.4 ACAAA  Sulawesi area              

P: 12APR2019 115014     0.0N  122.0E 4.0-5.4 ABAAA  Celebes Sea                

P: 16APR2019 115045     1.0S  123.0E 4.0-5.7 BAAAA  Sulawesi area              

 

An M 5.8 was felt in the region of Samoa today. NEIC reported it was felt with maximum intensity V in Samoa at Siusega, NW Upolu; Apia, American Samoa and Aua, Samoa. The last earthquake within about 200 km of this epicenter in Samoa with M>=5.8  occurred on November 20, 2017 with M 6.0.   Forecast 114976 had expected today's epicenter would be active within about 50  km around April 11.

 

O: 12APR2019 12:23:03  15.4S  172.8W mb=5.8  EMSC   SAMOA ISLANDS REGION         

P: 11APR2019 114976    16.0S  173.0W 4.0-5.6 AAAAA  Tonga Islands              

 

An M 5.9 also occurred northwest of Samoa in the region of New Britain. This is the second such event in this region in the past two days. A slightly smaller M 5.6 occurred on April 11 near the same epicenter. The previous issue of this summary reported on this event as:

 

 

"The strongest earthquake in the world today as an M 5.6 in the region of New Britain, Papua New Guinea. New Britain is an active seismic area and the last earthquake in the region within about 200 km of today's event with M>=5.6 occurred on March 11, 2019 with M 5.8." (April 11-12, 2019)

 

The last event of M>5.9 in this area was an M 6.0 on July 19, 2018 and prior to that an M 6.0 on December 1, 2017.

 

O: 12APR2019 14:51:32   6.4S  148.6E Mw=5.9  EMSC   NEW BRITAIN REGION, P.N.G.   

P:  2APR2019 114774     6.0S  149.0E 4.0-5.5 CAAAA  New Ireland                

P: 13APR2019 115036     7.0S  151.0E 4.0-5.6 AABAA  New Ireland                

 

 

An earthquake of M 2.9 in the valleys west of Los Angeles preceded the M 6.8 in Sulawesi by 11 minutes, 17 seconds. While it is unlikely that one could have helped promote the other (p- waves would have taken about 15 minutes to traverse this 155 degrees distance), both may have been promoted by an external effect such as a geomagnetic disturbance.  NEIC reported this earthquake of M 2.9 in Greater Los Angeles, California was felt with intensity II-III in the area(s) of Los Angeles, Beverly Hills, Glendale, Burbank, Mission Hills and in general within about 50 km of the epicenter.  The last earthquake with M>=2.9 within about 50 km of today's epicenter was an M 2.9 on March 22, 2019. Only one other such event has occurred in the area in the past half year - an M 3.1 on February 26, 2019. Forecasts 115136 and 115137 had expected today's evnet within about 25 km was likely around April 13.

 

O: 12APR2019 11:29:31  34.1N  118.4W Ml=2.9  EMSC   GREATER LOS ANGELES AREA, CALI

P: 13APR2019 115136    33.6N  118.5W 2.5-4.4 AAAAA  So. California             

P: 13APR2019 115137    34.0N  118.7W 2.5-4.5 AAAAA  So. California             

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 off the coast of Northern California. NEIC reported it was felt with light intensity along the coast at Eureka, California. This continues activation of this region off the coast of Northern California which began in late March and has included an M 5.5 on March 24, 2019. At M 4.6  today's event is the strongest in the area within about 150 km of the epicenter since an M 6.0 and 5.8 on January 25, 2018. Forecast 115188 and 115190 had expected this activity within about 15 km of the epicenter was likely in mid-April.

 

O: 12APR2019 14:06:26  40.4N  127.0W mb=4.6  EMSC   OFF COAST OF NORTHERN CALIFORN

P: 14APR2019 115190    40.9N  126.3W 2.5-4.4 AAAAA  Off Coast of No. Calif     

P: 18APR2019 115188    40.4N  127.2W 2.5-4.6 CAAAA  Off Coast of No. Calif     

 

 

 

 

MODERATE NEW BRITAIN QUAKE; ALABAMA/FLORIDA BORDER REMAINS ACTIVE

 

EARTHQUAKE SUMMARY FOR APRIL 11, 2019

 

The strongest earthquake in the world today as an M 5.6 in the region of New Britain, Papua New Guinea. New Britain is an active seismic area and the last earthquake in the region within about 200 km of today's event with M>=5.6 occurred on March 11, 2019 with M 5.8. An earthquake in Alabama of M 3.1 also began a series in that area on March 11, 2019. Forecast 115036 expected today's event was likely to the east of today's epicenter around April 13.

 

O: 11APR2019 21:31:50   6.5S  148.7E Mw=5.6  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 13APR2019 115036     7.0S  151.0E 4.0-5.6 AACAA  New Ireland                

 

The most unusual earthquake in the world today was an M 4.7 in north-central Siberia, Russia. It was not reported felt in this region. This is the first earthquake within about 300 km of this epicenter of M>=4.7 in at least 30 years.

 

O: 12APR2019 02:40:07  69.0N   99.5E ML=4.7  EMSC   NORTHCENTRAL SIBERIA, RUSSIA 

 

The largest earthquake in the U.S. or Canada today was an M 4.4 in Central Alaska north of Anchorage.  NEIC reported this earthquake of M 4.4 in Central Alaska was felt with intensity II-III in the area(s) of Alaska at Clear, Fairbanks, Anderson, Fort Wainwright, Healy, North Pole, Manley Hot Springs, Eielson AFB.  This is the strongest earthquake within about 150 km of today's epicenter since an M 4.7 on August 28, 2018 about 100 km northwest of today's event. Forecast 115227 had expected today's activity to the west in mid-April.

 

O: 11APR2019 10:42:45  64.7N  149.2W mb=4.4  EMSC   CENTRAL ALASKA               

P: 14APR2019 115227    65.1N  154.4W 3.2-5.1 BACAA  Northern Alaska            

 

The series of light earthquake on the Florida-Alabama area of the SE U.S. continued today with events of M 2.5, 2.6 and 2.8.  NEIC reported this earthquake of M 2.8 in Alabama was felt with intensity II-III in the area(s) of Flomaton, Alabama. This area saw an M 3.1 a month ago on March 11, 2019. At the time this reported noted in this regard:

 

 

"The most unusual earthquake in the U.S. today was an M 3.1 in southern Alabama. NEIC reported this earthquake of M 3.1 in Alabama was felt with intensity II-III in the area(s) of Century, Pensacola and Jay, Florida and in Mobile, Atmore and Brewton, Alabama.  Florida seldom feels tremor from earthquakes, so this is a significant regional event. The last earthquake within about 200 km of this epicenter with M>=3.1 occurred on February 18, 2011 and prior to that an M 3.1 on May 16, 2008." (March 11-12, 2019)

 

Forecasts 115117 and 115147 had expected today's activity was likely around April 12-17 within about 25 km of this epicenter.

 

O: 11APR2019 20:11:00  31.1N   87.2W mb=2.8  EMSC   ALABAMA                       

O: 12APR2019 03:51:21  31.1N   87.3W ML=2.6  EMSC   ALABAMA                      

O: 11APR2019 16:33:00  31.1N   87.3W mb=2.5  EMSC   ALABAMA                      

P: 12APR2019 115117    32.0N   87.0W 2.0-4.1 AAAAA  New Madrid area            

P: 17APR2019 115147    31.0N   87.0W 2.0-4.0 CAAAA  Southeast U.S.             

STRONG EARTHQUAKE OFF NORTHERN JAPAN

 

EARTHQUAKE SUMMARY FOR APRIL 10, 2019

 

The strongest earthquake in the world today was an M 6.1 off the coast of Northern Honshu, Japan. NEIC reported it was felt with intensity IV in Misawa, Aomori and II-III in Tokyo and Kakuda, Miyagi, Japan. This is the strongest earthquake in northern Japan in more than a year - the last such event within about 200 km of this epicenter being an M 6.2 on January 24, 2018. A similar inter-event time separated the previous such event of M 6.2 on November 11, 2016 from the January, 2018 earthquake (each 1 year and 2.5 months between).  Forecasts 114896 and 114880 had expected today's earthquake was likely within about 150 km of the epicenter in early April.

 

O: 11APR2019 08:18:19  40.4N  143.4E Mw=6.1  EMSC   OFF EAST COAST OF HONSHU, JAPA

P:  6APR2019 114896    40.0N  142.0E 3.5-5.5 BAAAA  Hokkaido, Japan            

P:  7APR2019 114880    39.0N  143.0E 4.0-5.4 BBAAA  So. of Honshu              

 

The strongest earthquake in the U.S. or Canada today occurred on the opposite side of the North Pacific. It was an M 4.7 off the coast of Oregon. It was reported with maximum intensity IV in Crescent City, California and I-II in Oregon at Florence, Brookings, Portland and Ashland.  This is the strongest earthquake off the Oregon coast within about 150 km of this epicenter since an M 6.2 on August 22, 2018. Two other such events have occurred in this area since 2016 - an M 5.5 on January 28, 2018 and an M 5.3 on July 29, 2018. Forecast 114913 had expected today's event was likely within about 50 km of the epicenter around April 10.

 

O: 10APR2019 14:11:32  44.2N  128.8W Mw=4.7  EMSC   OFF COAST OF OREGON          

P: 10APR2019 114913    43.9N  128.4W 3.0-4.4 AAAAA  Off Coast of Oregon        

 

An unusual earthquake of M 2.0 occurred today in Pennsylvania. This summary has previously linked earthquakes in this area with subsequent activity, including an enhanced possibility of, earthquakes in Southern California. This may be due to weather systems such as the weather bomb currently passing west and north of Pennsylvania. The largest earthquake in the past 30 years in this area of Pennsylvania was an M 4.2 and 4.6 on January 16, 1994. It was followed several hours later by the Northridge, California (M 6.7) earthquake of the same date. But other examples can be cited as well. An increase in seismicity in southern California is therefore expected during the next two days. California seismicity generally peaks in mid-April to early May and could do so again this year. The only other event within about 100 km of today's epicenter in the past eight years was an M 2.3 on April 23, 2017. Forecast 114915 had expected regional activity in early April.

 

O: 10APR2019 17:46:39  40.4N   76.1W ML=2.0  EMSC   PENNSYLVANIA                 

P:  3APR2019 114915    42.0N   80.0W 2.0-3.9 CBCAA  Ohio/Lake Erie             

 

 

 

 

SOUTH SANDWICH ISLANDS ENHANCEMENT CONTINUES

 

EARTHQUAKE SUMMARY FOR APRIL 9, 2019

 

A second strong earthquake in the past four days occurred today in the South Sandwich Islands. This event was at a shallow focus but was not reported felt. It occurred southeast of the normal large earthquakes in the area and is the strongest within about 150 km of today's epicenter since an 7.1 on December 11, 2018 and prior to that an M 6.7 on April 16, 2009. Forecast 115012 had expected this active southeast of the South Sandwich Islands was likely around April 7. When a strong quake of M 6.5 occurred on April 5, 2019, this summary noted:

 

"A strong M 6.5 occurred in the South Sandwich Islands today. It was not reported felt in this remote epicentral area. This may be a delayed reaction of strong tidal stresses in the area occurred with the previous full moon as noted in previous summaries:

 

 

"The full moon will arrive at 01:43 UT on March 21. Longitudes which area sub-lunar at this time are near 26 West and sub-solar at 154 East. These include the mid-Atlantic Ridge where a series of moderate earthquakes is occurring in the Azores, the South Sandwich Islands, and the region of Kamchatka and New Guinea among others. These will experience maximum tidal stresses but many areas are subject to tidal triggering outside these longitude zones. A strong tidal-related earthquake is likely in the next seven days. Tidally promoted events often occur with geomagnetic storms and/or near local solar noon or midnight." (March 18-25, 2019)

 

Today's event which occurred near local solar noon may have been promoted by the current geomagnetic storm and/or tidal stresses which maximize near this hour. An M 7.1 hit about 350 km southeast of this epicenter on December 11, 2018, but the last event in the South Sandwich Islands within about 200 km of today's epicenter with M>=6.5 occurred on May 28, 2016 with M 7.2 and prior to that on June 29, 2014. Forecast 115012 had expected today's event was likely within about 100 km  around April 5." (April 5, 2019)

 

The antipode to the South Sandwich Islands is at 59N 155E, a region north of Kamchatka, Russia. This region has been active in recent weeks and could see some triggered antipodal seismicity in the next several days.

 

O:  9APR2019 17:53:59  58.6S   25.5W Mw=6.5  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  7APR2019 115012    61.0S   22.0W 4.0-5.7 ACBAA  Southern  Ocean            

 

An M 4.4 in Montana occurred after the M 6.5 in the South Sandwich Islands. NEIC reported this earthquake of M 4.4 in Western Montana was felt with intensity II III in the area(s) of Montana at Lima, Virginia City, Dillon, Sheridan, Ennis; in Idaho at Leadore, Moore, Salmon, Lewisville and Rexburg. An M 3.2 aftershock was felt with intensity IV in Lima, Montana and II-III in Dillon, Ennis, Butte and Helena and in Idaho at Moore, Salmon, Arco, Halley and Ketchum. The M 4.4 occurred 15 minutes 46 seconds after the M 6.5 in the South Sandwich Islands. This is the time it takes for a p-diff seismic wave to travel the 124 degrees from the South Sandwich Islands epicenter to the epicenter in western Montana. It is highly likely that this seismic wave (although relatively minor) triggered the M 4.4 in Montana as it passed through the region. The P-diff wave was the first to arrive from the South Sandwich Islands in Montana.  The earthquake of M 4.4 was followed by a strong series of aftershocks. An aftershock in Montana 20 minutes after the South Sandwich Islands event may have been triggered by P-reflections (PP waves). Aftershocks 25 minutes (SKS); 37 minutes (SS) and 39 minutes (ScS) may also have been triggered by seismic waves from the South Sandwich Islands.

 

Today's event of M 4.4 is the strongest in western Montana within about 150 km  of this epicenter since an M 4.4-4.6 about 50 km to the east occurred April 5, 2011. The last such event of significantly larger magnitude in the region occurred July 26, 2005 about 100 km north of this with M 5.5. Forecast 114902 had expected today's event within about 25 km of this epicenter was likely around April 11.

 

 

O: 09APR2019 18:33:32  44.7N  112.5W Ml=2.0  EMSC   WESTERN MONTANA

O: 09APR2019 18:18:13  44.7N  112.5W Ml=2.2  EMSC   WESTERN MONTANA

O: 09APR2019 18:30:45  44.7N  112.5W Ml=2.3  EMSC   WESTERN MONTANA

O: 09APR2019 23:17:16  44.7N  112.5W Ml=2.3  EMSC   WESTERN MONTANA

O: 09APR2019 18:13:52  44.7N  112.5W Ml=2.4  EMSC   WESTERN MONTANA

O: 09APR2019 18:08:46  44.7N  112.5W Mw=4.4  EMSC   WESTERN MONTANA

O:  9APR2019 18:11:14  44.7N  112.5W ML=3.2  EMSC   WESTERN MONTANA               

P: 11APR2019 114902    44.5N  112.6W 2.0-4.0 AAAAA  Montana/Idaho              

 

MODERATE QUAKES IN SAMOA

 

EARTHQUAKE SUMMARY FOR APRIL 8, 2019

 

Seismicity was active in most of the aftershock zones in Alaska where moderate earthquakes occurred today. The strongest earthquakes in the world today were an M 5.1 and 5.2 in the region of Tonga and Samoa. They were not felt in the region. The last such events of M>5.2 in the region of Tonga and Samoa within about 200 km of this epicenter occurred as an M 5.3 on February 15, 2019. Forecast 114970 had expected today's activity within about 50 km of these epicenters was likely around April 6.

 

O:  8APR2019 20:15:44  15.5S  173.0W mb=5.1  EMSC   TONGA                        

O:  8APR2019 23:05:53  15.6S  173.0W mb=5.2  EMSC   SAMOA ISLANDS REGION         

P:  6APR2019 114970    15.0S  173.0W 4.0-5.5 AAAAA  Samoa Islands              

 

An earthquake of M 3.9-4.2 shook the Dominican Republic today. NEIC reported it was felt with intensity II-III in Las Terrnas, Saman, El Carril, San Cristobal and Santo Domingo, Dominican Republic. It was preceded by foreshocks of M 3.1, 3.3 and 3.4. The last earthquake in the Dominican Republic within about 150 km of today's M 4.2 occurred on February 5, 2019 with M 4.4, an aftershock of an M 5.3 on February 4, 2019. Forecast 114813 had expected this activity was likely around April 4.

 

It appears that today's activity may have been promoted by antipodal effects from Tropical Cyclone Wallace. This had been expected in previous issues o this summary as:

 

"Some enhanced seismicity may accompany this storm in the antipodal area of the eastern Caribbean in the Leeward Islands north to the Virgin Islands and Puerto Rico. The current antipode is at 16N 64W." (April 6-8, 2019)

 

The eye of TC Wallace was at 17S 113E when the M 4.2 occurred in the Dominican Republic at 18N 69W within about 250 km of the exact antipode.

 

O:  8APR2019 19:56:00  18.2N   69.2W ML=3.1  EMSC   DOMINICAN REPUBLIC REGION    

O:  8APR2019 08:48:39  18.3N   68.8W ML=3.4  EMSC   DOMINICAN REPUBLIC           

O:  8APR2019 09:55:30  18.4N   69.7W ML=3.3  EMSC   DOMINICAN REPUBLIC REGION    

O:  8APR2019 23:30:45  18.8N   69.8W ML=4.2  EMSC   DOMINICAN REPUBLIC           

P:  4APR2019 114813    19.0N   71.0W 3.4-5.1 BAAAA  Puerto Rico                

 

The largest earthquakes in the U.S. or Canada today were an M 4.8 in the Gulf of Alaska; an M 4.7 in the Fox Islands, Alaska; an M 4.7 also in the Fox Islands; an M 4.0 near Kodiak Island, Alaska and  an M 4.6 in northern Alaska. NEIC reported the event in northern Alaska was felt with intensity II in Huslia and possibly in Wasilla, Alaska. Otherwise the other events were not reported felt. Each had been forecast within about 100 km to occur around April 7-10 (see forecasts 114932, 114953, 114925, and 114951).

 

O:  8APR2019 07:35:20  51.9N  169.6W mb=4.7  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  7APR2019 114932    52.4N  169.4W 3.5-4.9 AAAAA  Fox Islands, Aleutians     

 

O:  8APR2019 10:41:27  52.7N  167.0W mb=4.6  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  7APR2019 114932    52.4N  169.4W 3.5-4.9 AABAA  Fox Islands, Aleutians     

 

O:  8APR2019 19:57:41  56.4N  149.3W Mw=4.8  EMSC   GULF OF ALASKA               

P:  8APR2019 114953    55.0N  149.0W 3.0-5.1 ABAAA  Gulf of  Alaska            

 

O:  9APR2019 00:27:13  56.7N  153.0W mb=4.0  EMSC   KODIAK ISLAND REGION, ALASKA 

P:  9APR2019 114925    56.8N  155.7W 3.5-5.1 AABAA  Alaska Peninsula           

 

O:  8APR2019 15:24:14  65.4N  153.4W Mw=4.4  EMSC   NORTHERN ALASKA              

O:  9APR2019 03:03:11  66.3N  156.9W ml=3.3  EMSC   NORTHERN ALASKA              

O:  9APR2019 00:44:49  66.3N  157.0W ML=3.6  EMSC   NORTHERN ALASKA              

P:  4APR2019 114951    66.0N  156.0W 3.0-5.0 BAAAA  Northern Alaska            

 

MODERATELY LARGE M 5.7 EVENTS SHAKE  CHILE; WEST CHILE RISE

 

EARTHQUAKE SUMMARY FOR APRIL 7, 2019

 

Moderately strong quakes of M 5.7 each hit the regions of Central Chile and the West Chile Rise today. The moderately strong M 5.7 in Chile was widely felt in the Valparaiso and Santiago region of Chile today. NEIC reported maximum intensity VI in San Antonio and V in Valparaiso and Quilpue and II-III in Quillota, Santiago and La Ligua, Chile. CSN reported an aftershock of M 4.3 was felt with intensity V in  Coquimbo at Los Vilos; IV in Salamanca and III in Illapel; in Valparaiso III at Quillota and Zapallar, Chile. NEIC reported an aftershock of M 4.5 in Central Chile was felt with intensity IV in the area(s) of Illapel, Coquimbo, Chile. NEIC reported another aftershock of M 4.3 in Central Chile was felt with intensity II-III in the area(s) of San Antonio, Valparaiso, Chile. This is south of the moderate recent activity in this area of central Chile. This is the strongest earthquake within central Chile within about 200 km of this epicenter since an 5.9 about 200 km south of today's epicenter on July 4, 2017 and prior to that an M 6.9 and aftershocks of M 5.8 and 5.9 in late April, 2017. Forecast 114997 had expected today's event within this area was likely around April 5.

 

O:  7APR2019 10:52:40  33.8S   72.5W Mw=5.7  EMSC   OFFSHORE VALPARAISO, CHILE   

O:  7APR2019 12:20:45  33.8S   72.6W mb=4.3  EMSC   OFFSHORE VALPARAISO, CHILE   

P:  5APR2019 114997    34.0S   71.0W 4.0-5.5 AAAAA  Central Chile               

 

O:  8APR2019 06:39     32.1S   71.6W mb=4.6  GUC    Coquimbo at Los Vilos; IV in S

P:  9APR2019 114996    31.0S   71.0W 4.0-5.5 ABAAA  Central Chile              

 

The M 5.7 in the West Chile Rise was not reported felt in this remote oceanic area. At M 5.7 it is the largest earthquake in the West Chile Rise since a similar M 5.7 on December 25, 2015. No earthquakes of M>5.7 have hit within about 300 km of today's epicenter in the past 30 years. Forecast 115004 had expected today's event was likely within about 50 km of this epicenter around April 7.

 

O:  7APR2019 19:53:07  40.9S   85.7W mb=4.7  EMSC   WEST CHILE RISE              

O:  8APR2019 04:42:12  41.1S   90.6W mb=4.4  EMSC   SOUTHEAST OF EASTER ISLAND   

O:  7APR2019 15:45:08  41.4S   87.7W Mw=5.7  EMSC   WEST CHILE RISE              

P:  7APR2019 115004    41.0S   88.0W 4.0-5.5 AAAAA  Chile Rise                 

 

The strongest earthquake in the U.S. or Canada today was an M 5.5 in the Alaska Peninsula. It was not reported felt in this remote area. The last earthquake within about 200 km of this epicenter with M>=4.4 was an M 4.5 on March 26, 2019. The last with M>4.5 was an M 5.1 on February 15, 2019 following an M 6.0 on December 31, 2018. Today's event appears to be an aftershock of the December, 2018 quake. Forecast 114941 had expected today's earthquake within about 50 km was likely around April 4.

 

O:  8APR2019 00:00:59  54.5N  161.1W mb=4.4  EMSC   ALASKA PENINSULA             

P:  4APR2019 114941    54.5N  161.8W 3.5-5.0 BAAAA  Unimak Islands, Aleutians  

 

TROPICAL CYCLONES PROMOTE SIGNIFICANT SEISMICITY IN BANDA; GULF OF CALIFORNIA

 

EARTHQUAKE SUMMARY FOR APRIL 6, 2019

 

The largest earthquakes in the world today were an M 6.4 in the Banda Sea of Indonesia and an M 5.2 in the northern Gulf of California. These appear to have been promoted by Tropical Storms Wallace and Joaninha respectively. The earthquake in the Banda Sea was at an epicenter near the eye of Tropical Cyclone Wallace while the activity in the Gulf of California began when Tropical Cyclone Joaninha was at the antipode to that epicenter. This activity had been anticipated in several previous issues of this summary.

 

The earthquake of M 6.3 in the Banda Sea was not reported felt in that area. As noted, it occurred near the eye of Tropical Cyclone Wallace and was probably promoted from that source as noted in previous issues:

 

"A tropical cyclone may be forming in the Banda Sea, Indonesia. This system is currently located at 9S 130E with winds up to 33 kts and moving to the WSW at 9 kts. Some enhanced seismicity may accompany this storm in the Banda Sea area in the next several days." (April 3-4, 2019)

 

and

 

"Tropical cyclone Wallace continued in the Banda Sea, Indonesia with winds up to 55 kts. This system is currently moving to the WSW at 6 kts. Some enhanced seismicity may accompany this storm in the Banda Sea area in the next several days. This may include a strong earthquake." (April 5-6, 2019)

 

The last earthquake of M>=6.3 in the Banda Sea was an M 6.7 on October 24, 2017 and prior to that an M 6.3 on December 6, 2016. Forecast 114768 had expected this event was likely within this area around April 9.

 

O:  6APR2019 22:19:30   6.8S  125.0E mb=4.7  EMSC   BANDA SEA                    

O: 06APR2019 21:55:01   6.8S  125.0E mw=6.3  ANSS   Dili East Timor

O:  6APR2019 21:55:03   6.9S  125.1E Mw=6.3  EMSC   BANDA SEA                    

P:  9APR2019 114768     5.0S  126.0E 4.0-5.4 BBAAA  Ceram area                 

 

"Tropical cyclone Joaninha (22S) continued in the South Indian Ocean today with winds up to 075 kts. This system could enable further seismicity the the South Indian Ocean seafloor and ridges.  The antipodal area is in the North Pacific at 24N 111W near central Gulf of California where some seismicity may be promoted." (March 30, 2019).

 

TC Joaninha passed over the antipode to the northern Baja epicenters at 29N 113W  on March 31. The activity in Baja began shortly after that.   This summary has covered this activity since that time including comments in the previous issue:

 

 

"A series of light earthquakes also hit south of California in the northern Gulf of California today with M 3.1-3.7. This area often becomes active with strong geomagnetic excursions and this may have triggered today's activity. Forecast 114865 had expected this activity in early April. The last such events in the area were an M 4.3 on March 2, 2019 and an M 4.1 on October 17, 2018 after two years of inactivity in the region since September, 2016. A strong swarm hit the area on March 28, 2016 including an M 5.5 and 5.3." (April 3-4, 2019)

 

NEIC reported these earthquakes of M 4.1 and 5.2 in northern Gulf of California were felt with intensity II-IV in the area(s) of Puerto Penasco, Sonora, Mexico and possibly in Arizona.

 

O: 06APR2019 21:19:40  30.3N  113.4W ML=4.0  EMSC   GULF OF CALIFORNIA

O: 06APR2019 21:14:55  30.5N  114.3W ML=3.1  EMSC   GULF OF CALIFORNIA

O: 06APR2019 09:36:01  30.6N  114.2W ML=3.0  EMSC   GULF OF CALIFORNIA

O: 06APR2019 20:17:31  30.6N  114.3W ML=4.1  EMSC   GULF OF CALIFORNIA

O: 06APR2019 19:45:22  30.6N  114.3W ML=4.2  EMSC   GULF OF CALIFORNIA

O: 06APR2019 21:01:40  30.7N  114.1W Mw=5.2  EMSC   GULF OF CALIFORNIA

O: 06APR2019 09:25:46  30.7N  114.2W ML=3.1  EMSC   GULF OF CALIFORNIA

O: 06APR2019 08:25:12  30.7N  114.2W ML=3.2  EMSC   GULF OF CALIFORNIA

O: 06APR2019 21:34:14  30.7N  114.2W ML=4.1  EMSC   GULF OF CALIFORNIA

O: 06APR2019 07:23:40  30.7N  114.3W ML=3.1  EMSC   GULF OF CALIFORNIA

O: 06APR2019 20:20:49  30.7N  114.3W ML=3.1  EMSC   GULF OF CALIFORNIA

O: 06APR2019 21:41:56  30.8N  114.1W ML=3.2  EMSC   GULF OF CALIFORNIA

O: 06APR2019 08:37:02  30.8N  114.1W ML=4.2  EMSC   GULF OF CALIFORNIA

O: 06APR2019 08:45:13  30.8N  114.1W mb=4.1  EMSC   GULF OF CALIFORNIA

O: 06APR2019 08:56:54  30.8N  114.2W ML=3.1  EMSC   GULF OF CALIFORNIA

O: 06APR2019 08:03:40  30.8N  114.2W ML=4.0  EMSC   GULF OF CALIFORNIA

O: 06APR2019 22:14:33  30.8N  114.6W ML=3.2  EMSC   GULF OF CALIFORNIA

O:  6APR2019 20:01:54  30.9N  114.3W ML=3.1  EMSC   GULF OF CALIFORNIA           

O: 06APR2019 21:01:42  30.8N  114.1W mw=5.2  ANSS   Puerto Penasco Mexico

P:  8APR2019 114865    30.2N  114.1W 2.0-4.3 AAAAA  SW U.S.A                   

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the Kodiak Island Region of Alaska. The last earthquake of M>=4.6 within about 200 km of this epicenter was an M 5.3 on May 11, 2018. Forecast 114925 had expected today's event in this area was likely around April 9.

 

O:  7APR2019 02:59:57  56.3N  154.2W Mw=4.5  EMSC   KODIAK ISLAND REGION, ALASKA 

O:  7APR2019 02:59:57  56.3N  154.2W Mw=4.6  ANSS   KODIAK ISLAND REGION, ALASKA 

P:  9APR2019 114925    56.8N  155.7W 3.5-5.1 AAAAA  Alaska Peninsula           

 

STRONG EARTHQUAKE IN THE SOUTH SANDWICH ISLANDS

 

EARTHQUAKE SUMMARY FOR APRIL 5, 2019

 

A strong M 6.5 occurred in the South Sandwich Islands today. It was not reported felt in this remote epicentral area. This may be a delayed reaction of strong tidal stresses in the area occurred with the previous full moon as noted in previous summaries:

 

 

"The full moon will arrive at 01:43 UT on March 21. Longitudes which area sub-lunar at this time are near 26 West and sub-solar at 154 East. These include the mid-Atlantic Ridge where a series of moderate earthquakes is occurring in the Azores, the South Sandwich Islands, and the region of Kamchatka and New Guinea among others. These will experience maximum tidal stresses but many areas are subject to tidal triggering outside these longitude zones. A strong tidal-related earthquake is likely in the next seven days. Tidally promoted events often occur with geomagnetic storms and/or near local solar noon or midnight." (March 18-25, 2019)

 

Today's event which occurred near local solar noon may have been promoted by the current geomagnetic storm and/or tidal stresses which maximize near this hour. An M 7.1 hit about 350 km southeast of this epicenter on December 11, 2018, but the last event in the South Sandwich Islands within about 200 km of today's epicenter with M>=6.5 occurred on May 28, 2016 with M 7.2 and prior to that on June 29, 2014. Forecast 115012 had expected today's event was likely within about 100 km  around April 5.

 

O:  5APR2019 16:14:19  55.9S   27.9W Mw=6.5  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  5APR2019 115012    56.0S   27.0W 4.0-5.8 AAAAA  So. Sandwich Islands       

 

A moderately large M 5.8 also occurred south of Honshu, Japan in the Izu Islands of Japan today. No damage was reported with this earthquake which occurred in a remote area. Earthquake activity in this region occasionally migrates to the north following strong Izu Islands events. The area can also be affected by geomagnetic storms such as the one which continued today. The last event of M>=5.8 in the Izu Islands area of Japan within about 200 km of today's epicenter occurred November 16, 2017 (M 5.8). The last with greater magnitude was an M 6.5 on September 4, 2013. Forecast 114861 had expected moderate activity in this area in early April.

 

O:  5APR2019 09:56:53  30.4N  138.6E Mw=5.8  EMSC   IZU ISLANDS, JAPAN REGION    

P:  3APR2019 114861    30.0N  142.0E 4.0-5.5 AACAA  Off East Coast Honshu      

 

An M 3.5 near Parkfield, California today was widely felt. NEIC reported intensity IV in California at Shandon and Bradley and II-III in San Miguel, Coalinga, Paso Robles, Templeton, Atascadero, Morro Bay, San Luis Obispo and Los Osos, California. The last earthquake in the Parkfield, CA area within about 50 km of this epicenter with M>=3.5 occurred on November 27, 2018 (M 4.0) and prior to that on August 14, 2018 (M 3.5). Forecasts 114839 had expected a moderate earthquake was possible in the area around April 7-8. The Parkfield area within about 35 km of this epicenter last saw a moderate event on August 6, 2012 (M 4.4).

 

O:  5APR2019 17:52:32  35.9N  120.4W Mw=3.5  EMSC   CENTRAL CALIFORNIA           

O:  5APR2019 22:28:29  36.0N  120.5W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P:  7APR2019 114839    36.6N  120.7W 2.5-4.4 AAAAA  Central California         

P:  8APR2019 114839    36.2N  120.8W 2.5-4.4 BAAAA  Central California         

 

The current swarm in the northern Gulf of California continued unabated today with events of M 4.0-4.5. In previous issues of this summary, this had been noted as:

 

 

"A series of light earthquakes also hit south of California in the northern Gulf of California today with M 3.1-3.7. This area often becomes active with strong geomagnetic excursions and this may have triggered today's activity. Forecast 114865 had expected this activity in early April. The last such events in the area were an M 4.3 on March 2, 2019 and an M 4.1 on October 17, 2018 after two years of inactivity in the region since September, 2016. A strong swarm hit the area on March 28, 2016 including an M 5.5 and 5.3." (April 3-4, 2019)

 

O:  5APR2019 21:31:10  30.2N  114.2W ML=4.5  EMSC   GULF OF CALIFORNIA           

O:  5APR2019 20:37:24  30.4N  114.4W ML=4.1  EMSC   GULF OF CALIFORNIA           

O:  5APR2019 20:53:38  30.5N  114.4W ML=4.0  EMSC   GULF OF CALIFORNIA           

O:  5APR2019 21:45:26  30.6N  114.3W ML=4.1  EMSC   GULF OF CALIFORNIA           

O:  6APR2019 00:26:07  30.8N  114.1W ML=4.2  EMSC   GULF OF CALIFORNIA           

O:  5APR2019 20:20:15  30.9N  114.6W ML=3.8  EMSC   GULF OF CALIFORNIA           

P:  8APR2019 114865    30.2N  114.1W 2.0-4.3 BAAAA  SW U.S.A                   

 

MODERATE QUAKES SHAKE TURKEY

 

EARTHQUAKE SUMMARY FOR APRIL 4, 2019

 

The most active area in the world today was Turkey where an M 4.8-5.3 shook regions in the east and an M 4.4 in the west of Turkey.  NEIC reported the earthquake of M 5.3 in Eastern Turkey was felt with intensity II-III in the area(s) of Gaziantep, Turkey. The earthquake of M 4.8 in eastern Turkey was the strongest within about 200 km of that epicenter since an M 5.6 shook the region on March 2, 2017 and prior to that on December 2. 2015 with M 5.5 The event in western Turkey of M 4.4 was part of the aftershock sequence of the M 5.7 of March 20, 2019. It is the second largest aftershock to date after an M 5.0 on March 31, 2019. The activity in western Turkey is at 104 degrees from the M 7.5 in Ecuador of February 22, 2019 and was probably promoted by energy from that event. Forecasts 114885 and 114886 had expected this activity in Turkey was likely around April 4-5 within about 100 km of each epicenter.

 

O:  4APR2019 15:01:18  37.5N   29.4E mb=4.4  EMSC   WESTERN TURKEY               

P:  4APR2019 114885    38.0N   29.0E 3.5-5.2 AAAAA  Turkey                     

 

O:  4APR2019 17:31:11  38.4N   39.1E mb=4.8  EMSC   EASTERN TURKEY               

O:  4APR2019 17:31:11  38.3N   39.2E mb=5.3  ANSS   EASTERN TURKEY               

P:  5APR2019 114886    39.0N   40.0E 3.5-4.9 AAAAA  Turkey                     

 

An earthquake of M 5.3 also shook areas of Myanmar and India today. NEIC reported this earthquake of M 5.3 in India-Myanmar was felt with intensity V in Mariani, Assam, India; IV in Dimapur, Nagaland, and Gauhati, Assam, India and II-III in the area(s) of India at Manipur, Golaghat, Jorhat, Silchar, Shillong and Aizawi. This is the strongest earthquake within about 200 km of this epicenter since an M 6.6 on January 7, 2018 and prior to that an M 5.7 on January 3, 2017. Forecast 114540 had expected today's activity at the end of March or early April in this area.

 

O:  4APR2019 07:45:29  25.5N   94.4E mb=5.3  EMSC   MYANMAR-INDIA BORDER REGION  

P: 31MAR2019 114540    24.0N   94.0E 4.0-5.4 BBAAA  Myanmar                    

 

The strongest earthquakes in the U.S. or Canada today were a pair of M 3.7 events in the aftershock zone in the Gulf of Alaska. These were not reported felt in this remote region. This remains an active seismic zone following the M 7.9 of January 23, 2018. The last event of M>=3.7 in the area was an M 4.0 on March 15, 2019. Forecast 114953 had expected today's event was likely in early April.

 

O:  4APR2019 13:55:35  56.4N  149.1W ML=3.7  EMSC   GULF OF ALASKA               

O:  4APR2019 12:19:19  56.4N  149.1W ml=3.7  EMSC   GULF OF ALASKA               

P:  8APR2019 114953    55.0N  149.0W 3.0-5.1 BBAAA  Gulf of  Alaska            

 

Enhanced seismicity continued today in the northern Gulf of California with moderate events of M 4.3 and 4.5 among others. In the previous issue of this summary this had been noted as:

 

 

 -61.0  -22.0 27  4  7 2019    4.0-5.7  Southern  Ocean                  3 2 115012 608

 

O:  4APR2019 22:55:23  30.6N  114.4W ML=4.3  EMSC   GULF OF CALIFORNIA           

O:  4APR2019 22:43:33  30.6N  114.5W ML=4.5  EMSC   GULF OF CALIFORNIA           

P:  8APR2019 114865    30.2N  114.1W 2.0-4.3 BAAAA  SW U.S.A                   

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.0 in Peru March 1, 2019 where promoted seismicity is considered likely.

 

"A series of light earthquakes also hit south of California in the northern Gulf of California today with M 3.1-3.7. This area often becomes active with strong geomagnetic excursions and this may have triggered today's activity. Forecast 114865 had expected this activity in early April. The last such events in the area were an M 4.3 on March 2, 2019 and an M 4.1 on October 17, 2018 after two years of inactivity in the region since September, 2016. A strong swarm hit the area on March 28, 2016 including an M 5.5 and 5.3." (April 3-4, 2019)

 

LOS ANGELES, CA M 3.6 TRIGGERS M 2.5 OFF SAN FRANCISCO

 

EARTHQUAKE SUMMARY FOR APRIL 3, 2019

 

An earthquake of M 3.6 was widely felt in the region of Los Angeles, California today. NEIC reported it was felt with maximum intensity V in Anahein and IV in Yorba Linda, Orange and II-II in Chino Hills, Villa Park, Brea, Santa Fe, Los Alamitos, Corona, Aliso Viejo, Newport, Huntington Beach, Newport Beach and in general within about 50 km of the epicenter. The last earthquake within about 50 km of this epicenter in the greater Los Angeles area was an M 4.4 on August 29, 2018 about 40 km north of today's epicenter. Forecast 114871 had expected today's event was likely within about 10 km of this epicenter around April 2.

 

O:  3APR2019 12:06:22  33.9N  117.7W ML=3.6  EMSC   GREATER LOS ANGELES AREA, CALI

O:  3APR2019 12:37:29  33.9N  117.7W Ml=2.3  EMSC   GREATER LOS ANGELES AREA, CALI

P:  2APR2019 114871    33.8N  117.7W 2.5-4.6 AAAAA  So. California             

 

The earthquake in Los Angeles was followed by an M 2.5 in the San Pablo Bay area near San Francisco 2 minutes and 34 seconds later. The distance of 5.5 degrees between these two events takes S- and P-waves 2.5 minutes to traverse. It would therefore appear that this event in Central California was triggered by waves from Los Angeles. As it was widely felt, it is not a ghost event - a misreading of seismic traces from a distant event as a local event. The area of the San Pablo Bay has seen increased seismicity in the past week. That a minor earthquake could be triggered by light seismic waves from Los Angeles suggests that the region is under considerable stress at this time. This could indicate this as the initiating point for a near-term moderate or large earthquake. Such an event, as today's would probably be associated with strong geomagnetic disturbance, a strong solar flare or high tidal stresses. A series of earthquakes of M 2.5-3.0 hit the area to the north and east of this on March 30, 2019 (M 2.9, 2.9, 2.7 and 2.6) after an M 2.8 and 2.6 on March 27, 2019 at today's epicenter. Forecast 114842 had expected regional activity around April 4.

 

NEIC reported this earthquake of M 2.5 west of San Francisco, California  was felt with intensity II-III in the area(s) of California at Napa, Oakland, San Francisco and South San Francisco.

 

O:  3APR2019 12:08:54  38.1N  122.4W Md=2.5  EMSC   SAN PABLO BAY, CALIFORNIA    

P:  4APR2019 114842    38.9N  122.8W 2.5-4.7 AAAAA  Central California         

 

A series of light earthquakes also hit south of California in the northern Gulf of California today with M 3.1-3.7. This area often becomes active with strong geomagnetic excursions and this may have triggered today's activity. Forecast 114865 had expected this activity in early April. The last such events in the area were an M 4.3 on March 2, 2019 and an M 4.1 on October 17, 2018 after two years of inactivity in the region since September, 2016. A strong swarm hit the area on March 28, 2016 including an M 5.5 and 5.3.

 

O: 03APR2019 10:01:45  30.7N  114.2W ML=3.2  EMSC   GULF OF CALIFORNIA

O: 03APR2019 09:42:07  30.7N  114.2W ML=3.7  EMSC   GULF OF CALIFORNIA

O: 03APR2019 16:19:17  30.9N  114.2W ML=3.5  EMSC   GULF OF CALIFORNIA

O:  3APR2019 08:49:05  30.7N  114.2W ML=3.1  EMSC   GULF OF CALIFORNIA           

P:  8APR2019 114865    30.2N  114.1W 2.0-4.3 BAAAA  SW U.S.A                   

 

The strongset earthquake in the U.S. or Canada today was an M 4.3 aftershock in the Rat Islands, Alaska. An M 6.4-6.5 hit this area yesterday. Today's event

had been expected in forecast 114938 to occur around April 3.

 

O:  3APR2019 11:15:51  51.8N  177.8E mb=4.3  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  3APR2019 114938    52.0N  177.0E 4.0-5.8 AAAAA  Rat Islands                

 

An unusual earthquake of M 4.4 hit the Pyrenees of Spain today. NEIC reported this earthquake of M 3.7-4.4 in Spain was felt with intensity II-III in the area(s) of La Massana La Lassana, Andorra. The last earthquake of M>=4.4 within about 200 km of this epicenter was an M 4.5 12 years ago on November 15, 2007 and prior to that an M 5.1 on September 21, 2004. Forecast 114618 had expected a moderate earthquake in this area in late March or early April.

 

O:  3APR2019 15:29:51  42.3N    1.3E ML=4.4  EMSC   PYRENEES                     

P: 26MAR2019 114618    42.0N    3.0E 3.0-5.3 CABAA  France                     

 

STRONG EARTHQUAKE RATTLES RAT ISL:ANDS, ALEUTIANS, ALASKA

 

EARTHQUAKE SUMMARY FOR APRIL 2, 2019

 

A strong M 6.4-6.5 quake shook the Rat Islands in the western Aleutians, Alaska today. It was followed by a strong series of aftershocks. None of these were reported felt in this remote area. When this area saw an M 4.9 foreshock yesterday, this summary noted:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 4.9 in the Rat Islands, Aleutians, Alaska. It was not reported felt in this remote area. This is the strongest earthquake in the Rat Islands since an M 5.1 on March 2, 2018 more than a year ago. Forecast 114674 had expected today's event within about 50 km of this epicenter was likely around March 31." (April 1-2, 2019)

 

Today's event may have been triggered by a strong geomagnetic storm which  maximized near the time of the Rat Islands mainshock. This summary had expected enhanced seismicity at high latitudes such as the Rat Islands in association with this storm as:

 

"High latitude geomagnetic field also active to minor storm conditions  with AP at 22.  The minor geomagnetic storm which began March 31, especially at high latitudes and maximizing near mid-day could bring enhanced global seismicity over the next two days near the geomagnetic equator and at high latitudes." (March 30-April 2, 2019)

 

The coming new moon may also have promoted today's event which occurred near local solar noon, a prime time for tidal effects on seismicity. The forecast, which included portions of Alaska, related to the new moon has read:

 

 

"The new moon will arrive on April 5, 2019 at 08:50 UT. Longitudes which are at solar midnight at this time are near 130 West longitude while those at solar

noon are near 50 East longitude. These include areas of eastern Alaska and western North America in the west and Turkey and Iran in the east. These regions are most likely to see tidal triggering with this new moon but many other areas are subject to tidal triggering as well. Tidally triggered events are most likely near local solar midnight and local solar noon." (March 31-April 2, 2019)

 

 

The last earthquake in the Rat Islands of M>=6.5 was an M 6.6 on October 8, 2017. Today's shallow focus event, however is the strongest at a shallow depth since an M 6.8 on June 14, 2005 in  the Rat Islands. An intermediate focus M 7.9 hit the region to the south on June 23, 2014, the only other such regional events in the past 13 years. Forecasts 114674 and 114938 had expected a strong earthquake within about 100 km of today's epicenter was likely at the end of March or in early April. Today's activity is located at  101 degrees from the last major earthquake in the world - the M 7.5 in Ecuador of February 22, and was probably promoted by strongly concentrated seismic energy at this distance from that event.

 

 

O: 03APR2019 02:51:14  51.8N  177.9E mb=4.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 02APR2019 23:28:50  51.8N  178.0E mb=4.6  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 02APR2019 21:39:40  51.8N  178.1E mb=5.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 03APR2019 01:03:43  51.9N  178.1E mb=4.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 02APR2019 21:46:24  52.0N  178.0E mb=4.7  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 02APR2019 23:13:38  52.1N  178.2E mb=4.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 02APR2019 21:35:32  52.2N  178.0E mw=6.5  ANSS   Kiska Volcano Alaska

O: 02APR2019 21:35:32  52.2N  178.1E Mw=6.4  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  2APR2019 114938    51.0N  178.0E 4.0-6.0 ABAAA  Rat Islands                

P: 31MAR2019 114674    52.0N  179.0E 4.0-5.6 AAAAA  Rat Islands                

 

A moderately strong earthquake also shook the whole of Taiwan today. This event of M 5.4 is the strongest in Taiwan since an M 5.7 and 5.8 on October 23, 2018 and prior to that an M 6.4 on February 6, 2018. CWB reported this earthquake was felt with intensity IV in Kaohsiung, Pingtung, Chiayi; III in Taitung, Tainan, Hualien, Yunlin, Nantou, Taichung; II in Changhua, Penghu, Miaoli, Yilan, Hsinchu, Taipei and I in Taoyuan and Hsinchu Counties, Taiwan. NEIC reported this earthquake of M 5.4 in Taiwan was felt with intensity V in Pingtung; IV in Kaohsiung, and II-III in the area(s) of Taitung, Chiayi, Tainan, Yunlin, Taichung and Hsinchu, Taiwan. Forecast 114831 had expected moderatly large earthquakes in Taiwan in early April.

 

O:  3APR2019 01:52:56  23.0N  120.9E Mw=5.4  EMSC   TAIWAN                       

O:  3APR2019 01:52:55  23.0N  120.9E ML=5.6  TAI    Hualien, Taiwan              

P:  2APR2019 114831    23.0N  122.0E 4.0-5.6 AAAAA  Taiwan