MODERATE QUAKE SHAKES SOUTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR APRIL 3, 2020

 

A moderate earthquake of M 4.9-5.0 shook regions southeast of Los Angeles, California today. It was reported by NEIC to have been felt with intensity IV throughout a large portion of Southern California including at Mountain Center, Anza, Palm Desert, Ranchita, Warner Springs, La Quinta, Palm Springs, Aguanga, Indian Wells, Rancho Mirage. More than 20,000 people reported to NEIC that they had felt this event which occurred in the local evening. It was reported felt as far as 1000 km from the epicenter. This is the strongest earthquake within about 100 km of this epicenter since an M 5.2 on June 10, 2016 and prior to that an M 5.5 on August 26, 2012. A strong M 7.2 earthquake rocked the area south of this ten years ago on April 4, 2010 on Easter Sunday (see history section below). The earthquake occurred in the desert regions southeast of Los Angeles and no major damage was reported from this epicentral region. The timing of today's event appears to have been promoted by several factors including plate motions induced by a storm off the northeast U.S., the strongest geomagnetic storm in nearly half a year and its relation to the Kuril Islands M 7.7 of March 25. In the previous summary it had been noted:

 

 

"Seismicity in California, Oregon and Washington was at low levels today. Some regional triggering in southern California is likely following the M 6.5 in  Idaho. The full moon on April 8 may reduce the likelihood of a moderate quake from April 6-10 but seismicity could be enhanced in the next three days in  the area due to an unusual reverse air flow and storm pattern in the Northeast U.S over the past three days. Harmonic resonance is likely at this time in the North American Plate, partly due to this weather pattern." (April 2-3, 2020)

 

The weather pattern referred to is a nor-easter which this summary has repeatedly tied to significant seismic activity in the western U.S. Winds with speeds up to 70 m/h were recorded as the storm battered areas from New Jersey to Nova Scotia and Maine. Instead of the typical winds from the west, a low gets situated off the northeast coast and due to a combination of factors does not immediately move to the northwest. Winds shift to the north and east (hence nor-easter) and can be substantial. These winds push North America to the west affecting plate motions differently than the prevailing westerlies. In addition to strong precipitation events (the current storm dropped up to 5 inches of rain in three days) this can lead to promotion of seismicity in the west.

 

The geomagnetic storm was also described in previous issues as it related to the M 6.5 in Idaho as:

 

 

"Today's earthquake in Idaho coincided with the strongest disturbance in the geomagnetic field since late October, 2019 as noted in this summary:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 15.  High latitude geomagnetic field saw active conditions  with AP at 25. This is the strongest disturbance in the geomagnetic field since AP reached 26 on October 26, 2019. Moderate disturbance in the geomagnetic field such as today's can help promote enhanced seismicity especially at high latitudes." (March 31, April 1, 2020)

 

This summary has long been an advocate of seismic promotion from both nor-easter type storms and geomagnetic triggering.

 

Another factor which probably promoted the event in Southern California at this time was the series of events to the north in Idaho (M 6.5 March 31) and the Salt Lake City  (M 5.6, March 18); and the Kuril Islands M 7.7 (M 7.7 March 25). In particular today's event is located near the 6th node from the Kurils (60 degrees). This summary had expected seismic promotion in southern California at this time from the Kurils in previous issues as:

 

 

"Moderate far-field triggering is likely following the earthquake in the Kuril Islands. ... at 60 degrees Central Indonesia and southern California. These areas may see enhanced seismicity in coming days." (March 24-25, 2020)

 

A series of earthquakes in Central Indonesia at the 6th and 7th node has been followed since then in this summary. This appears to be the latest in this nodal triggering from the major Kuril Islands event.

 

Following is a listing of aftershocks of M>=3.0 today in the region of Southern

California. A more complete listing can be found in the Regional California section below. Forecast 122841 had expected today's activity within about 50 km of these epicenter was likely at the end of March or in early April. This activity is at 104 degrees from the M 6.8 in Eastern Turkey of January 24 and near the sixth node (60 degrees) from the Kuril Islands M 7.7 and may have been promoted by energy from those events.

 

O: 04APR2020 01:53:18  33.5N  116.5W Mw=4.9  ANSS   SOUTHERN CALIFORNIA

O: 04APR2020 01:53:20  33.2N  116.3W Mw=4.9  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 01:55:35  33.5N  116.5W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 02:59:22  33.5N  116.5W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 05:12:34  33.5N  116.5W ML=3.5  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 01:54:22  33.5N  116.5W ML=3.8  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 02:04:59  33.5N  116.5W ML=3.8  EMSC   SOUTHERN CALIFORNIA

O: 04APR2020 04:07:21  33.5N  116.5W Mw=3.6  EMSC   SOUTHERN CALIFORNIA

P: 31MAR2020 122841    33.7N  116.1W 2.5-4.3 BAAAA  So. California             

 

The strongest earthquakes in the world today continued in the activation of the South Sandwich Islands and in the antipodal area of the Komandorsky Islands of

Russia. These included an M 5.4 in the Komandorsky and a second in the South Sandwich Islands along with an M 5.1. This activity was not reported felt in these remote areas. The M 5.4 in the South Sandwich Islands is the largest since the activation began following the M 7.7 near the antipode in the Kuril Islands of March 25. The last event of larger magnitude in the South Sandwich Islands was an M 6.1 on January 20, 2020. Forecast 123202 had expected today's South Sandwich activity in early April. 

 

O:  4APR2020 01:52:49  55.9S   27.8W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  7APR2020 123202    55.0S   28.0W 4.0-6.1 BAAAA  So. Sandwich Islands       

 

O:  3APR2020 22:50:46  58.7S   25.2W Mw=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  4APR2020 123202    60.0S   26.0W 4.0-6.0 ABAAA  So. Sandwich Islands       

 

The M 5.4 in the Komandorsky Islands is the strongest within about 200 km in that region since an M 5.7 on June 27, 2019 following events of M 6.3 and 6.4 on

June 25 and 26. These occurred about 200 km northwest of today's epicenter and were aftershocks of an M 7.3 on December 20, 2018. Forecast 123137 had expected today's event within about 25 km of this epicenter was likely in early April.

 

O:  4APR2020 06:18:27  54.9N  166.2E Mw=5.4  EMSC   KOMANDORSKIYE OSTROVA REGION 

P:  7APR2020 123137    55.0N  166.0E 4.0-5.8 BAAAA  Komandorsky Isl            

 

An unusual earthquake off the coast of Syria of M 4.6 also occurred today. NEIC reported maximum shaking in Syria at Tartus,  Banias, Misiaf, Hama, and Jubayl, Juniyah, and Babda, Lebanon with II-III in This is the strongest event within about 200 km in Syria since an M 5.0 on July 29, 2015. Forecast 123048 had expected today's event within about 100 km was likely around April 4.

 

O:  4APR2020 03:41:53  35.7N   35.6E ML=2.6  EMSC   NEAR THE COAST OF SYRIA      

O:  3APR2020 18:15:42  35.8N   35.6E ML=4.8  EMSC   NEAR THE COAST OF SYRIA      

P:  4APR2020 123048    35.0N   35.0E 3.0-4.5 AAAAA  Aegean Sea                 

 

Aftershocks also continued to be felt in southern Idaho today. The strongest  of today events were two of M 4.3 felt with intensity II-III in Idaho at Stanley, Lowman, Garden Valley, Cascade, Idaho City, Horseshoe Bend, Donnelly, Garden City, Boise. Following is a listing of today's events of M>=3 in the area of Southern Idaho. A more complete listing is found in the Regional seismicity section below. Forecast 123110 had expected today's events around April 5.

       

O: 03APR2020 16:10:23  44.3N  115.1W Ml=3.8  EMSC   SOUTHERN IDAHO

O: 03APR2020 21:57:24  44.3N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 03APR2020 20:21:47  44.3N  115.2W Ml=4.3  EMSC   SOUTHERN IDAHO

O: 03APR2020 15:44:29  44.4N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 04APR2020 04:36:08  44.4N  115.2W ML=3.1  EMSC   SOUTHERN IDAHO

O: 03APR2020 12:48:15  44.4N  115.2W ML=3.2  EMSC   SOUTHERN IDAHO

O: 03APR2020 07:54:48  44.4N  115.2W ML=3.5  EMSC   SOUTHERN IDAHO

O: 03APR2020 12:15:35  44.4N  115.2W ML=3.5  EMSC   SOUTHERN IDAHO

O: 03APR2020 08:32:31  44.4N  115.2W ML=3.6  EMSC   SOUTHERN IDAHO

O: 03APR2020 19:30:19  44.4N  115.2W Ml=3.0  EMSC   SOUTHERN IDAHO

O: 03APR2020 20:06:24  44.4N  115.2W Ml=4.3  EMSC   SOUTHERN IDAHO

O:  4APR2020 01:46:10  44.5N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO               

P:  5APR2020 123110    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

MODERATE SEISMICITY DOMINATES

 

EARTHQUAKE SUMMARY FOR APRIL 2, 2020

 

The strongest earthquakes in the world today were moderate events of M 4.7-5.2.

These included an M 4.7 in Eastern Turkey; an M 5.1 in the South Sandwich Islands, off the coast of Nicaragua, Central America (M 5.2); the northern Mariana Islands, (M 5.2); and an M 5.2 in the Banda Sea, Indonesia. Most of these were in remote areas and were not reported felt.

 

The earthquake in Eastern Turkey is the strongest in the area within about 150 km of that epicenter since an M 6.0 on February 23, 2020 and may be a regional aftershock of that event about 150 km southeast of today's epicenter. Forecasts 122852 and 123094 had expected this activity within about 100 km was likely

in late March or early April.

 

NEIC reported this earthquake of M 4.7 in Eastern Turkey  was felt with intensity II-III in the area(s) of Eastern Turkey at Acara and  Bayrut, Lebanon, and in Gazientep, Turkey. 

 

O:  3APR2020 05:44:25  38.9N   43.5E Mw=4.7  EMSC   EASTERN TURKEY               

P:  4APR2020 123094    38.0N   43.0E 3.5-5.1 AAAAA  Turkey                     

P: 31MAR2020 122852    39.0N   41.0E 3.5-4.8 AABAA  Turkey                     

 

O:  2APR2020 10:15:40  11.8N   88.4W Mw=5.2  EMSC   OFF COAST OF CENTRAL AMERICA 

P: 31MAR2020 122772    13.0N   89.0W 3.5-5.0 ABAAA  Coast of Central America   

 

O:  2APR2020 20:09:07  20.6N  144.8E mb=5.2  EMSC   MAUG ISLANDS REG, N. MARIANA I

P:  3APR2020 123046    22.0N  145.0E 4.0-5.5 ABAAA  Volcano Islands            

P: 26MAR2020 122805    22.0N  144.0E 4.0-5.4 CBAAA  Volcano Islands            

 

O:  2APR2020 21:42:41   7.0S  126.6E Mw=5.2  EMSC   BANDA SEA                    

P: 30MAR2020 122747     7.0S  125.0E 4.0-5.3 AABAA  Banda Sea                  

 

The South Sandwich Islands have been active since the M 7.7 in the Kuril Islands of March 25. They lie near the antipode of that event and are subject to antipodal seismic enhancement at this time.

 

O:  2APR2020 18:43:37  56.2S   27.3W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  5APR2020 123202    56.0S   26.0W 4.0-5.8 BAAAA  So. Sandwich Islands       

P: 27MAR2020 122976    56.0S   28.0W 4.0-5.6 BAAAA  So. Sandwich Islands       

 

Aftershocks continued in southern Idaho today. The strongest was an M 4.2 which NEIC reported was felt in Idaho at Middleton with intensity V; and New Plymouth with IV. Lesser shaking of II-III was reported from Meridian, Garden City, Lowman and Stanley, Idaho. Following is a list of events of M>=3 in southern Idaho today following the M 6.5 of March 31. A more complete listing is found in the regional seismicity section below. Forecast 123110 had expected this activity was likely in early April.

 

O: 03APR2020 04:22:43  44.2N  115.1W ML=3.0  EMSC   SOUTHERN IDAHO

O: 03APR2020 01:45:39  44.2N  115.1W ML=3.2  EMSC   SOUTHERN IDAHO

O: 03APR2020 04:00:52  44.2N  115.1W ML=3.2  EMSC   SOUTHERN IDAHO

O: 03APR2020 04:41:48  44.2N  115.1W ML=3.3  EMSC   SOUTHERN IDAHO

O: 02APR2020 23:16:19  44.2N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 02APR2020 13:51:55  44.3N  115.1W Ml=3.4  EMSC   SOUTHERN IDAHO

O: 02APR2020 23:46:33  44.3N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 02APR2020 18:16:55  44.3N  115.2W Ml=3.2  EMSC   SOUTHERN IDAHO

O: 02APR2020 18:25:36  44.3N  115.2W Ml=3.2  EMSC   SOUTHERN IDAHO

O: 02APR2020 13:54:26  44.3N  115.2W Ml=3.5  EMSC   SOUTHERN IDAHO

O: 02APR2020 20:17:53  44.4N  115.1W ML=3.1  EMSC   SOUTHERN IDAHO

O: 03APR2020 02:26:07  44.4N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 02APR2020 11:12:55  44.4N  115.2W Ml=3.5  EMSC   SOUTHERN IDAHO

O: 02APR2020 12:22:42  44.4N  115.2W Ml=3.5  EMSC   SOUTHERN IDAHO

O: 02APR2020 11:01:17  44.4N  115.2W Ml=3.7  EMSC   SOUTHERN IDAHO

O: 02APR2020 14:19:45  44.4N  115.2W Ml=3.7  EMSC   SOUTHERN IDAHO

O: 03APR2020 05:34:36  44.4N  115.2W Ml=4.0  EMSC   SOUTHERN IDAHO

O: 02APR2020 20:45:01  44.4N  115.2W Ml=4.2  EMSC   SOUTHERN IDAHO

O: 02APR2020 10:35:06  44.5N  115.2W ML=3.1  EMSC   SOUTHERN IDAHO

O: 02APR2020 21:45:23  44.5N  115.2W ML=3.2  EMSC   SOUTHERN IDAHO

O: 02APR2020 22:39:54  44.5N  115.2W ML=3.2  EMSC   SOUTHERN IDAHO

O: 02APR2020 19:59:28  44.5N  115.2W Ml=3.0  EMSC   SOUTHERN IDAHO

O: 02APR2020 21:24:20  44.5N  115.2W Ml=3.2  EMSC   SOUTHERN IDAHO

O: 02APR2020 13:09:37  44.5N  115.2W Ml=3.5  EMSC   SOUTHERN IDAHO

O: 02APR2020 18:56:02  44.5N  115.2W Ml=3.5  EMSC   SOUTHERN IDAHO

P:  5APR2020 123110    44.4N  115.1W 2.0-4.1 BAAAA  Montana/Idaho              

 

The largest event in the U.S. or Canada outside Idaho today was an M 3.5 which was not felt in the Fox Islands epicentral zone. The last event within about 200 km of this epicenter in the Fox Islands of M>3.5 was an M 5.0 on January 13, 2020. This may be an aftershock of that earthquake. Activity in this area had been expected around April 4 about 50 km to the east.

 

O:  3APR2020 06:44:57  52.6N  170.6W ml=3.5  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  4APR2020 123135    52.4N  169.4W 3.5-5.1 AAAAA  Fox Islands, Aleutians     

 

Seismicity in California, Oregon and Washington was at low levels today. Some regional triggering in southern California is likely following the M 6.5 in  Idaho. The full moon on April 8 may reduce the likelihood of a moderate quake from April 6-10 but seismicity could be enhanced in the next three days in  the area due to an unusual reverse air flow and storm pattern in the Northeast U.S. over the past three days. Harmonic resonance is likely at this time in the North American Plate, partly due to this weather pattern.

 

M 5.5 IN ALOR, INDONESIA

 

EARTHQUAKE SUMMARY FOR APRIL 1, 2020

 

The largest earthquake in the world today was an M 5.5 in the region of East Timor, Indonesia. NEIC reported it was felt with intensity III in Dili, East Timor. BMG reported it was felt with intensity II-III in Alor, Indonesia. This is the strongest earthquake within about 200 km of this epicenter since an M 6.3 on April 6, 2019 and prior to that an M 5.6 on July 7, 2016.  Forecasts 122747 and 122752 had expected today's activity at the end of March or early in April was likely within this area.

 

O:  2APR2020 02:13:14   8.0S  125.7E Mw=5.5  EMSC   KEPULAUAN BARAT DAYA, INDONESI

P: 30MAR2020 122747     7.0S  125.0E 4.0-5.3 AAAAA  Banda Sea                  

P: 30MAR2020 122752     9.0S  124.0E 4.0-5.3 AABAA  Flores Island area         

 

An unusually large M 4.8 occurred in the Comoros Islands north of Madagascar today. NEIC reported it was felt in Madagascar at Pemba Cabo Delgado about 60 km south of the epicenter. An M 3.2 also occurred today in the Mayotte region north of Madagascar. The last earthquake with M>=4.8 in the region of Mozambique within about 100 km of today's event was an M 5.0 on February 13, 2012. Forecast 122936 had expected today's activity was likely at the end of March. This activity is located at 144 degrees from the M 6.5 in Idaho of March 31. This is a distance at which energy from large surface events concentrates from those events and may help trigger additional events. In the previous issue this summary had noted this possibility as:

 

"While today's earthquake (in Idaho) is not quite large enough for significant far-field triggering, it is instructive to identify areas where such triggering is most likely. The 103 degree distance passes through Taiwan, the Cook Strait, New Zealand, New Guinea, Northern Philippines Northern India and Afghanistan and Iran, the Pacific-Antarctic Ridge and Southern Chile. Regions near 144 degrees from Idaho Include the southern Indian Ocean and South Africa and Mayotte." (April 1, 2020)

 

O:  1APR2020 06:21:40  12.8S   45.4E ML=3.2  EMSC   MAYOTTE REGION               

P: 26MAR2020 122936    12.0S   45.0E 3.0-4.3 BAAAA  Mayotte    area            

 

O:  1APR2020 22:18:12  13.1S   41.0E mb=4.8  EMSC   MOZAMBIQUE                   

P: 26MAR2020 122936    12.0S   45.0E 3.0-4.3 CBCAA  Mayotte    area            

P: 28MAR2020 122936    18.0S   42.0E 3.0-4.3 BCAAA  Madagascar area            

 

Aftershocks of the M 6.5 yesterday in southern Idaho continued to be felt today. The strongest of these was an M 4.4. NEIC reported it was felt with maximum intensity V in Idaho at Emmett and IV in Ketchum, Eagle, and Hailey with II-III shaking within about 100 km of the epicenter reported from Boise, Garden City, McCall, Cascade and Lowman. Following is a listing of aftershocks of M>=3 in the area today. Forecast 122871 had expected today's activity was likely around April 1.

 

O: 02APR2020 05:54:19  44.2N  115.1W ML=3.0  EMSC   SOUTHERN IDAHO

O: 01APR2020 09:49:31  44.3N  115.1W ML=3.1  EMSC   SOUTHERN IDAHO

O: 01APR2020 16:01:40  44.3N  115.1W ML=3.4  EMSC   SOUTHERN IDAHO

O: 01APR2020 15:35:16  44.3N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 01APR2020 10:57:37  44.3N  115.2W Ml=4.2  EMSC   SOUTHERN IDAHO

O: 01APR2020 12:35:46  44.3N  115.3W ML=3.0  EMSC   SOUTHERN IDAHO

O: 01APR2020 13:28:27  44.3N  115.3W ML=3.2  EMSC   SOUTHERN IDAHO

O: 01APR2020 10:39:29  44.4N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 01APR2020 12:17:51  44.4N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 01APR2020 19:55:47  44.4N  115.2W ML=3.1  EMSC   SOUTHERN IDAHO

O: 01APR2020 07:42:25  44.4N  115.2W ML=3.2  EMSC   SOUTHERN IDAHO

O: 01APR2020 10:33:40  44.4N  115.2W ML=3.2  EMSC   SOUTHERN IDAHO

O: 01APR2020 08:48:03  44.4N  115.2W ML=3.4  EMSC   SOUTHERN IDAHO

O: 02APR2020 05:28:07  44.4N  115.2W ML=3.4  EMSC   SOUTHERN IDAHO

O: 01APR2020 20:49:12  44.4N  115.2W ML=3.6  EMSC   SOUTHERN IDAHO

O: 01APR2020 19:38:24  44.4N  115.2W Ml=3.2  EMSC   SOUTHERN IDAHO

O: 01APR2020 19:40:19  44.4N  115.2W Ml=3.8  EMSC   SOUTHERN IDAHO

O: 01APR2020 13:30:09  44.4N  115.2W Ml=4.4  EMSC   SOUTHERN IDAHO

O: 01APR2020 17:51:05  44.5N  115.2W ML=3.1  EMSC   SOUTHERN IDAHO

O: 01APR2020 12:40:12  44.5N  115.2W Ml=3.4  EMSC   SOUTHERN IDAHO

O: 01APR2020 21:03:20  44.5N  115.2W Ml=4.1  EMSC   SOUTHERN IDAHO

P:  1APR2020 122871    44.5N  116.2W 2.0-3.8 AAAAA  Montana/Idaho              

 

 

Aftershocks also continued in southern Puerto Rico today. These events were felt in the region of Ponce and San Juan with light shaking. The strongest of today's aftershocks was of M 3.4. Forecast 122785 had expected this activity at the end of March.

 

O:  2APR2020 02:50:12  19.3N   66.6W Md=3.4  EMSC   PUERTO RICO REGION           

P: 29MAR2020 122785    19.0N   66.0W 3.4-4.8 BAAAA  Puerto Rico                

 

The largest earthquake in the U.S. or Canada today was an M 4.9 in the Andreanof Islands, Alaska. This is an active area and the last event in the region of M>=4.9 occurred March 23, 2020 with M 4.9 and prior to that on March 3 with M 5.1. Forecast 122898 had expected today's event was likely around March 31.

 

O:  1APR2020 09:32:47  51.4N  178.3W mb=4.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 31MAR2020 122898    51.0N  179.9W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

 

STRONG M 6.5 SHAKES SOUTHERN IDAHO -  PROMOTED BY NEW GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR MARCH 31, 2020

 

A strong earthquake of M 6.5 shook the area of Southern Idaho and surroundings today. More than 34,000 people reported felt activity to NEIC for this event. Maximum shaking was reported with slight damage at Lowman and Stanley, Idaho with intensity VI. Intensity V was reported in Idaho at Garder, and IV in Cascade, McCall, Ketchum, Donnelly, Challis, Spoud. It was reported as far as 1000 km from the epicenter with light to moderate intensity in Washington, Oregon, British Columbia, Montana, Alberta, California, Nebraska, Saskatchewan, Colorado, Nevada, Oregon, Utah. A series of aftershocks followed the maximum of which was M 4.6. This is the strongest earthquake in southern Utah within about 300 km of this epicenter since an M 7.3 in the Borah Peak area of October 28, 1983. No major damage, deaths or injuries were reported by the media but some landslides did occur and many were frightened by the quake. The quake at 5:52 pm local time occurred at rush hour when many would normally have been traveling from work to homes, but a lockdown due to the COVID-19 pandemic, keeping schools closed and people at home, probably mitigated injuries from this earthquake. The only other such events in the region of Utah which have been recorded were an M 7.0 on January 6, 1965 about 200 km east of today's epicenter and an M 6.6 about 500 km southeast of today's epicenter on March 12, 1934 but today's event is the strongest within about 150 km ever recorded in Idaho. The only other earthquake in the general area of M>=6 in the past was an M 6.0 about 300 km south of today's event on February 21, 2008. It is also the second strongest earthquake in the  U.S. or Canada since an M 7.0 on November 30, 2018 in Southern Alaska near Anchorage. The only event of larger magnitude in the U.S. or Canada in this time was the M 7.1 near Ridgecrest of July 6, 2019.

 

The Borah Peak quake of October 28, 1983 has been described in this summary as:

 

"Known as the Borah Peak earthquake, this is the largest ever located in Idaho. At least two were killed in Challis, Idaho with up to $13 million damage. Maximum intensity was IX. Surface faulting occurred in Idaho along a 35-km section of the fault and as wide as 100 meters. Scarps up to 1-2 meters high were observed. Rockfalls, water fountains and sand boils occurred.  A temporary lake was formed south of Dickey. More than 200 homes and buildings were damaged at Challis. Chimneys were damaged as was the high school at Challis." (October 28, 2019)

 

While today's earthquake is not quite large enough for significant far-field triggering, it is instructive to identify areas where such triggering is most likely. The 103 degree distance passes through Taiwan, the Cook Strait, New Zealand, New Guinea, Northern Philippines Northern India and Afghanistan and Iran, the Pacific-Antarctic Ridge and Southern Chile. Regions near 144 degrees from Idaho Include the southern Indian Ocean and South Africa and Mayotte. Indonesia at the 3rd node; the Ryukyu Islands, western Turkey and central Chile at the 4th node; northern Honshu, the North Atlantic off Spain and Porugal, southern Peru at the fifth node; the Kurils, Colombia at the 6th and Puerto Rico and Central America at the 7th node. These areas may see enhanced seismicity in the next week.

 

A series of what look like far-field moderately large events followed the Idaho earthquake within several hours. These included two of M 5.0 and 5.2 off the coast of Aisen, Chile and in the Pacific-Antarctic Ridge (M 5.6).

 

Today's earthquake in Idaho coincided with the strongest disturbance in the geomagnetic field since late October, 2019 as noted in this summary:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 15.  High latitude geomagnetic field saw active conditions  with AP at 25. This is the strongest disturbance in the geomagnetic field since AP reached 26 on October 26, 2019. Moderate disturbance in the geomagnetic field such as today's can help promote enhanced seismicity especially at high latitudes." (March 31, 2020)

 

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

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

 

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

 

The listing of aftershocks below contains those of M>=3.5 in the first six hour after the mainshock. A listing of M>=3 aftershocks is found in the "ROCKY MOUNTAINS" section below. Today's mainshock had been forecast in Idaho to occur about 70 km west of this epicenter around April 1 or 70 km east of the epicenter at the end of March. Today's activity is near the 6th node (60 degrees) from the  M 7.7 in the Kuril Islands of March 25 and may have been promoted by energy from that source.

 

O: 01APR2020 02:23:26  44.3N  115.1W mb=3.8  EMSC   SOUTHERN IDAHO

O: 01APR2020 01:03:03  44.3N  115.2W ML=3.5  EMSC   SOUTHERN IDAHO

O: 01APR2020 00:01:45  44.3N  115.2W ML=3.6  EMSC   SOUTHERN IDAHO

O: 01APR2020 02:21:58  44.3N  115.2W ML=3.6  EMSC   SOUTHERN IDAHO

O: 01APR2020 02:09:05  44.3N  115.3W mb=4.1  EMSC   SOUTHERN IDAHO

O: 01APR2020 05:07:21  44.4N  115.2W Mw=3.8  EMSC   SOUTHERN IDAHO

O: 01APR2020 00:27:42  44.4N  115.2W Mw=4.8  EMSC   SOUTHERN IDAHO

O: 31MAR2020 23:52:31  44.4N  115.1W mw=6.5  ANSS   W of Challis Idaho

O: 31MAR2020 23:52:31  44.5N  115.1W Mw=6.5  EMSC   SOUTHERN IDAHO               

P:  1APR2020 122871    44.5N  116.2W 2.0-3.8 AAAAA  Montana/Idaho              

P: 24MAR2020 122871    44.4N  114.1W 2.0-3.8 CAAAA  Montana/Idaho              

 

A small earthquake of M 3.1 was recorded north of Idaho at about the same longitude as the M 6.5 in Idaho several hours before that event. It is too small to have much effect on the Idaho event and too far away (about 700 km) but may represent effects of regional stresses similar to that affecting Idaho at this time. The last earthquake within about 100 km of this epicenter with M>=3.1 occurred on May 23, 2017 with M 3.3. The last within about 200 km was an M 3.2 on February 15, 2020. Forecast 122897 had expected a light earthquake to the north in Alberta was likely around March 30.

 

O: 31MAR2020 19:37:50  50.2N  114.9W ML=3.1  EMSC   ALBERTA, CANADA              

O: 31MAR2020 19:37:50  50.2N  114.9W MB=3.1  ECAN Elkford, BC    

P: 30MAR2020 122897    52.0N  115.0W 2.0-3.9 BAAAA  Alberta                    

 

A series of light earthquakes in Yellowstone National Park also preceded the  Idaho event today. The strongest of these was M 2.9. The last earthquake of M>=2.9 in Yellowstone was an M 3.1 on December 30, 2019.  Forecast 122896 had expected today's activity was likely at the end of March. This too may represent expressions of regional stress or reaction to the  geomagnetic storm today.

 

O: 31MAR2020 08:45:28  44.6N  111.0W Ml=2.9  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 31MAR2020 15:36:46  44.7N  111.1W ML=2.6  EMSC   WESTERN MONTANA              

O: 31MAR2020 15:49:28  44.8N  110.1W Ml=2.2  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 26MAR2020 122896    44.2N  110.3W 2.0-3.8 BAAAA  Yellowstone/Wyoming        

 

The M 5.4 in the Pacific-Antarctic Ridge followed the M 6.5 in Idaho by about 6 hours. It was not felt in the epicentral area which is remote. This epicenter is at 100-101 degrees from Idaho and was probably activated by energy from Idaho which concentrated on the surface at this distance after inner earth reflections and refractions.

 

O:  1APR2020 06:32:25  54.4S  136.2W mb=5.4  EMSC   PACIFIC-ANTARCTIC RIDGE      

 

The earthquakes in Aisen, Chile which occurred about four hours after Idaho were probably not nodal events from that source, but rather from the M 7.7 in the Kuril Islands. They occurred at 144 degrees from that epicenter, a distance at which significant triggering was expected in this summary as:

 

"Moderate far-field triggering is likely following the earthquake in the Kuril Islands. Areas at about 144 degrees which are seismic include the Chile Rise near Aisen, Chile" (March 26, 2020)

 

The M 5.2 is the strongest event within about 200 km of this Aisen epicenter since an M 5.3 on November 6, 2018. Forecast 122962 had expected today's activity to the northeast in late March.

 

O: 01APR2020 03:55:22  45.6S   76.5W mb=4.6  EMSC   OFF COAST OF AISEN, CHILE

O:  1APR2020 04:09:22  45.6S   76.6W Mw=5.2  EMSC   OFF COAST OF AISEN, CHILE    

P: 26MAR2020 122962    41.0S   74.0W 4.0-5.3 BCBAA  Central Chile              

 

A pair of unusual earthquakes of M 2.6 and 2.9 occurred in Hudson Bay, Quebec, Canada today. These events at high latitude may have been promoted by today's geomagnetic storm. The last earthquake of M>=2.9 in this remote area within about 200 km of these epicenters occurred on March 21, 2009 with M 3.8. Forecast 122916 had expected today's activity within about 100 km at the end of March.

 

O: 31MAR2020 05:18:34  60.4N   80.3W ML=2.9  EMSC   HUDSON BAY                   

O: 31MAR2020 05:18:34  60.4N   80.2W MB=2.9  ECAN Akulivik, QC    

O: 30MAR2020 22:32:26  60.5N   80.3W MB=2.6  ECAN Akulivik, QC    

P: 26MAR2020 122916    60.0N   79.0W 2.5-3.8 BAAAA  Baffin/Davis Strait Canada 

 

MODERATE NODAL SEISMICITY LESSENS BUT TRIGGERING STILL ACTIVE AFTER KURILS

 

EARTHQUAKE SUMMARY FOR MARCH 30, 2020

 

Continuing seismicity at the fifth through seventh node from the M 7.7 in the Kuril Islands of March 25 is still likely in the areas of Central Indonesia and in Utah, Idaho and the Pacific Northwest. While moderate quakes at these regional nodes are likely to decrease, large earthquakes continue to be possible at these and at lower node orders 1-7. The recent M 5.7 in Salt Lake City, Utah will likely have an effect in the redistribution of stress around that epicenter for weeks to come. Light earthquakes hit this area today with an M 2.2 in southern Utah and an M 2.1 in the Salt Lake City area. The event in southern Idaho had been expected within about 50 km around March 30. Aftershocks had also been expected at this time in the Salt Lake City area.

 

O: 30MAR2020 12:29:51  40.7N  112.1W Ml=2.1  EMSC   WASATCH FRONT URBAN AREA, UTAH

P: 27MAR2020 122855    40.3N  112.0W 2.0-3.8 AAAAA  Utah area                   

 

O: 30MAR2020 09:22:29  42.4N  111.5W ML=2.2  EMSC   SOUTHERN IDAHO               

P: 30MAR2020 122895    43.0N  111.5W 2.0-3.8 AAAAA  Yellowstone/Wyoming        

 

Seismicity continued at elevated levels in Puerto Rico today. The strongest event in the region today was an M 4.2 in the southern aftershock zone. It was felt with maximum intensity V in Puerto Rico at Ensenada, Guayanilla, Sabana Grande, IV in Guanica, Vauco, and II-III in Lajas, Penuelas, San German, Ponce. 

This is the strongest aftershock in the area in nearly two months - since an M 5.0 on February 4, 2020 and a similar M 5.0 on January 25, 2020. In the previous issue of this summary when a similar M 4.2 occurred in northern Puerto Rico it had been noted:

 

"Today's epicenter is at 102 degrees from the Kuril M 7.7 epicenter and this activity was probably promoted by concentrated energy from that source which reflected and refracted to the surface from the core-mantle boundary and concentrated at 101-104 degrees from the Kurils." (March 29, 2020)

 

O: 30MAR2020 08:12:41  17.9N   66.9W Md=3.2  EMSC   PUERTO RICO REGION

O: 30MAR2020 16:06:42  17.9N   66.9W Mw=4.1  EMSC   PUERTO RICO REGION

O: 30MAR2020 16:06:42  17.9N   66.9W Mw=4.2  ANSS   PUERTO RICO REGION           

P: 27MAR2020 122785    18.0N   67.0W 3.4-4.8 BAAAA  Puerto Rico                

 

An earthquake of M 4.3 also occurred today in the region of Barbuda to the east of the Puerto Rico epicenter. This epicenter is at 104 degrees from the Kurils and was likely promoted by energy from the M 7.7 there six days ago. Similar earthquakes in Antigua and Barbuda occurred on November 23 and December 19, 2019 but the last of significantly larger magnitude within about 100 km was an M 4.7 on April 17, 2018. Forecast 122776 had expected today's event was likely around March 26.

 

O: 31MAR2020 06:42:50  17.2N   62.1W mb=4.3  EMSC   ANTIGUA AND BARBUDA REGION   

P: 26MAR2020 122776    16.0N   60.0W 3.0-5.0 BBBAA  Leeward Islands            

 

The strongest earthquake in the world today was an M 5.6 in the Colombia-Ecuador border region. It was lightly felt in Colombia and Ecuador.  This is the strongest earthquake in the area within about 200 km of this epicenter since an M 7.8 and aftershocks on April 16, 2016 and July 11, 2016. Forecast 122751 had expected today's event in this region was likely around March 31.

 

O: 30MAR2020 09:09:05   0.4N   77.7W mb=5.6  EMSC   COLOMBIA-ECUADOR BORDER REGION

P: 31MAR2020 122751     1.0S   78.0W 4.0-5.3 ABAAA  Ecuador                    

 

The second largest earthquake in the world today was an M 5.1 in the South Indian Ocean. It was followed by an M 4.6 aftershocks. The last such activity within about 200 km of this epicenter was an M 5.2 and 5.3 on April 6, 2019 and October 9, 2017.  These events are located at 102 degrees from the Kuril Islands M 7.7 and were probably promoted by strongly concentrated energy from that event. Forecast 122703 had expected activity in this area within about 150 km at the end of March.

 

O: 30MAR2020 18:26:01  13.8S   66.0E mb=4.6  EMSC   MID-INDIAN RIDGE             

O: 30MAR2020 17:54:41  13.8S   66.2E mb=5.1  EMSC   MID-INDIAN RIDGE             

P: 21MAR2020 122703    15.0S   67.0E 4.0-5.3 CBAAA  So. Indian Ocean           

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 in the Fox Islands, Aleutians, Alaska. NEIC reported it was felt with intensity III in Unalaska, Alaska. The last earthquake within about 200 km of today's epicenter in the Fox Islands with M>=4.8 occurred as an M 4.8 on September 27, 2019 and prior to that an M 5.3 on September 23, 2019. Forecast 122903 had expected today's event within about 100 km was likely around March 30. This area had been expected to see significant triggering from the Kuril Islands at this time in the far-field forecast in previous issues of this summary.

 

 

O: 30MAR2020 08:21:14  53.6N  166.1W mb=4.8  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 29MAR2020 122903    53.7N  167.0W 3.5-4.9 AAAAA  Fox Islands, Aleutians     

 

LOYALTY ISLANDS SHIFTS FOCUS OF KURIL NODAL TRIGGERING FROM INDONESIA

 

EARTHQUAKE SUMMARY FOR MARCH 29, 2020

 

The major triggering episode at nodal distances from the M 7.7 Kuril Islands event of March 25 in Indonesia appears to have reached a temporary end. There were no moderate or large quakes of M>=4.5 in this area today. Moderate seismicity is still possible for the next several days in the region and at the antipode in Colombia where an M 4.9 occurred yesterday. The strongest earthquake in the world occurred in the Loyalty Islands south of Vanuatu with M 5.6. This summary had expected this might occur as this area is at the 5th node from the Kurils in the previous issue:

 

 

"The strongest earthquake in the world today was an M 5.9 in Vanuatu. NEIC reported it was felt with intensity IV in Vila Shefa, Vanuatu and in We-Isles, New Caledonia. This earthquake is not at a significant nodal distance (67 degrees) from the Kurils but south of this an active zone in the Loyalty Islands is at the fifth node (72 degrees) and may be expected to show seismic enhancement at this time." (March 29, 2020)

 

Today's event of M 5.6 in the Loyalty Islands was at 71 degrees from the Kurils (node 5). It is the strongest earthquake in the Loyalty Islands since an M 5.7 on December 10, 2019. Forecast 122952 had expected today's event within about 100 km was likely at the end of March.

 

O: 29MAR2020 18:19:15  21.3S  169.6E Mw=5.6  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 25MAR2020 122952    22.0S  170.0E 4.0-5.4 BAAAA  Loyalty Islands            

 

The strongest earthquake in the U.S. or Possessions today was an M 4.2 in northern Puerto near the Puerto Rico Trench. The last earthquake of M>=4.2 in northern Puerto Rico within about 100 km of today's epicenter occurred on December 28, 2019 with M 4.4. A moderate earthquake near 103 degrees from the Kurils also occurred in the Northern Mid-Atlantic today. Forecast 122785 had expected today's event was likely in this area around March 29. This summary had expected Puerto Rico would be active at this time as noted in the previous issue:

 

"Today's epicenter is at 102 degrees from the Kuril M 7.7 epicenter and this activity was probably promoted by concentrated energy from that source which reflected and refracted to the surface from the core-mantle boundary and concentrated at 101-104 degrees from the Kurils." (March 29, 2020)

 

O: 29MAR2020 08:20:18  19.2N   65.2W mb=4.2  EMSC   PUERTO RICO REGION           

P: 29MAR2020 122785    19.0N   66.0W 3.4-4.8 AAAAA  Puerto Rico                

 

O: 29MAR2020 18:02:42  31.2N   41.5W mb=4.8  EMSC   NORTHERN MID-ATLANTIC RIDGE  

 

 

A light earthquake shook regions of the St. Lawrence Valley, Quebec today. The last event within about 150 km of this epicenter with M>=3.1 was an M 3.4 on January 13, 2020 and prior to that an M 3.1 on October 19, 2017.  The last of M>=3.6 occurred as an M 3.7 on March 15, 2015. NEIC reported this earthquake of M 3.5 in Quebec  was felt with intensity II-III in the area(s) of Quebec with IV in Saint-Roch-de-Achigan, L'Epiphanie, Saint-Jacques, Vercheres and Lavaitrie and III in Crabtree, Sainte-Anne-des-Plaines, Lac-Lapierre, Laurentides. Today's event of M 3.1-3.6 is near the fifth node from the Kurils and may have been enhanced by energy from that source. Forecasts 122875 and 122876 had expected today's event was likely at the end of March.

 

O: 29MAR2020 07:21:04  45.9N   73.5W MB=3.6  ECAN of Sorel-Tracy, QC             

O: 29MAR2020 07:21:04  45.8N   73.6W mb=3.1  ANSS   NNE of Mascouche Canada

O: 29MAR2020 07:21:04  45.8N   73.6W mb=3.1  EMSC   ST. LAWRENCE VALLEY REG., CANA

P: 25MAR2020 122875    46.2N   72.7W 2.0-3.8 BAAAA  New England                

P: 31MAR2020 122876    45.7N   75.2W 2.0-3.8 AAAAA  New York State             

 

An earthquake of M 2.6 also occurred in New York State today. NEIC reported this earthquake of M 2.6 in New York State  was felt with intensity II-III in the area(s) of New York State in Lyndonville, Barker, Kent, Medina, Albion (V), Gasport, Newfane, Holley, Lockport and Sanborn. It is the first with M>=2.6 within about 150 km of the epicenter since an M 2.9 on July 19, 2018 and prior to that an M 3.1 on October 20, 2015. Forecasts 12283 and 122876 had expected today's event was likely in western New York around March 26.

 

O: 29MAR2020 17:04:46  43.4N   78.4W mb=2.6  EMSC   NEW YORK                     

P: 24MAR2020 122883    41.0N   81.0W 2.0-3.9 BCBAA  Ohio/Lake Erie             

P: 26MAR2020 122876    44.0N   74.0W 2.0-3.8 BACAA  New York State             

 

INDONESIA QUAKES MIGRATE SW AT KURIL NODES 5-7

 

EARTHQUAKE SUMMARY FOR MARCH 28, 2020

 

Moderate to strong seismicity continued in Indonesia today. But much of this was not at the 7th node as seen in the past several days. Instead it was occurring at the 6th node as it migrated to the southwest. Lower nodes dissipate energy slower than those at higher numerical value and may be expected to see enhanced seismicity longer. An earthquake of M 5.8 was widely felt in the area of Sulawesi, Indonesia. This

 epicenter is at the sixth node (60 degrees) from the M 7.7 in the Kuril Islands of March 25. BMG reported this earthquake of M 5.8 in Sulawesi, Indonesia  was felt with intensity II-III in the area(s) of Palu, Sigi, Sausu, IV in Poso and Pasangkayu and III inPalopo, Masamba, Mamuju, Topoyo, Kalukku, Luwu Utara and Sanggata Kutai, Timur, Indonesia. NEIC reported it was felt with intensity III in Palu, Sulawesi, Indonesia. In the previous issue of this report, this event had been expected as:

 

"Another area which saw enhanced seismicity in central Indonesia today was the Sulawesi region. A moderately strong quake may be about to occur in this area as well. Other moderate quakes in Indonesia at nodal distances from the Kurils included an M 4.7 south of Bali (node 5); and an M 4.7 in Mindanao, Philippines (node 7) and an M 5.0 in New Britain (node 7)." (March 27, 2020)

 

The M 5.8 is located at the sixth node from the Kurils (60 degrees) and was joined by several moderate earthquakes in the Banda Sea at this distance. The last earthquake of M>=5.8 within about 200 km of this event in Sulawesi was an M 7.5 on September 28, 2018 with two aftershocks on the same day of M 5.8. That event occurred about 200 km northwest of today's epicenter.  Forecast 122764 had expected today's event was likely within about 100 km around March 31.

 

O: 28MAR2020 23:45:38   1.7S  120.1E ML=4.1  EMSC   SULAWESI, INDONESIA

O: 28MAR2020 15:55:32   1.7S  120.2E ML=4.1  EMSC   SULAWESI, INDONESIA

O: 28MAR2020 16:22:02   1.7S  120.2E ML=4.2  EMSC   SULAWESI, INDONESIA

O: 28MAR2020 15:43:19   1.7S  120.2E Mw=5.8  EMSC   SULAWESI, INDONESIA          

P: 31MAR2020 122764     1.0S  120.0E 4.0-5.3 BAAAA  Sulawesi area              

 

Moderate earthquakes south of Java (M 4.4) and South of Bali (M 4.7) occurred today at the fifth node from the Kurils.

 

The strongest earthquake in the world today was an M 5.9 in Vanuatu. NEIC reported it was felt with intensity IV in Vila Shefa, Vanuatu and in We-Isles, New Caledonia. This earthquake is not at a significant nodal distance (67 degrees) from the Kurils but south of this an active zone in the Loyalty Islands is at the fifth node (72 degrees) and may be expected to show seismic enhancement at this time. The last earthquake within about 150 km of this epicenter in Vanuatu with M>=5.8 was an M 5.9 on August 6, 2019. Forecast 122947 had expected today's activity was likely within about 50 km at the end of March.

 

O: 28MAR2020 17:48:18  17.7S  168.3E Mw=5.8  EMSC   VANUATU                      

P: 24MAR2020 122947    18.0S  168.0E 4.0-5.3 BAAAA  Vanuatu Islands            

 

The strongest earthquake in Canada today was an M 4.1 in the southern Yukon Territory. This is the first event of M>=4.1 within about 150 km of this epicenter since an M 4.5 on June 4, 2001. This epicenter is at the 10th node from the Kurils (36 degrees) and may have been promoted from that source. It may also have been promoted by stress associated with the recent new moon which maximized at this longitude. Forecast 122924 had expected today's event was likely within this area around March 29.

 

 

O: 29MAR2020 06:11:55  64.6N  138.8W mb=4.1  EMSC   SOUTHERN YUKON TERRITORY, CANA

P: 29MAR2020 122924    64.0N  137.0W 3.0-4.7 AAAAA  Northern Alaska            

 

The strongest earthquake in the U.S. or Possessions today was an M 3.9 in the

U.S. Virgin Islands east of Puerto Rico. The Virgin Islands has not seen an event of M>=3.9 since an M 4.7 on December 7 and prior to that an M 5.0 and aftershocks in early October, 2019. Today's epicenter is at 102 degrees from the Kuril M 7.7 epicenter and this activity was probably promoted by concentrated energy from that source which reflected and refracted to the surface from the core-mantle boundary and concentrated at 101-104 degrees from the Kurils. Forecast 122777 had expected today's event in the Virgin Islands was likely around March 31.

 

O: 29MAR2020 08:20:16  19.4N   65.0W md=3.9  ANSS   Amalie U.S. Virgin Islands   

P: 29MAR2020 122785    19.0N   66.0W 3.4-4.8 AAAAA  Puerto Rico                

P: 31MAR2020 122777    19.0N   64.0W 3.0-4.8 AAAAA  Leeward Islands            

 

On the other side of Central America an unusual M 4.5 earthquake hit the Galapagos Islands region today. This epicenter is at 100 degrees from the Kuril mainshock and was (similar to  the Virgin Islands event) also probably promoted by energy from that source. The last earthquake of significantly larger magnitude within about 200 km of this epicenter occurred as an M 5.6 on September 24, 2016. An M 4.9 occurred the day before the Kuril mainshock within about 50 km of today's epicenter. Forecast 122741 had expected this activity in the Galapagos around March 25. In previous issues of this summary the Galapagos had been specified as an area to watch because of it's 103 degree distance from the Kurils as:

 

"Moderate far-field triggering is likely following the earthquake in the Kuril Islands... Areas at about 103 degrees from the Kurils include the north Central Pacific Rise .." (March 25-27, 2020)

 

O: 28MAR2020 20:30:52   2.3N   95.5W mb=4.5  EMSC   GALAPAGOS ISLANDS REGION     

P: 25MAR2020 122741     1.0N   91.0W 3.5-4.9 BBCAA  Galapagos Islands          

 

The antipodal area of the Kuril event - the South Sandwich Islands – continued active today with an M 4.9. This is not an aftershock of the M 5.3-5.7 about 200 km to the north which occurred on March 26. Forecast 122976 had expected today's event within about 150 km was likely around March 29.

 

O: 29MAR2020 04:06:03  58.7S   25.3W mb=4.9  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 29MAR2020 122976    60.0S   26.0W 4.0-5.5 ABAAA  So. Sandwich Islands       

 

A light earthquake shook regions of the St. Lawrence Valley, Quebec today. The last event within about 150 km of this epicenter with M>=3.1 was an M 3.4 on January 13, 2020 and prior to that an M 3.1 on October 19, 2017.  The last of M>=3.6 occurred as an M 3.7 on March 15, 2015. NEIC reported this earthquake of M 3.5 in Quebec  was felt with intensity II-III in the area(s) of Quebec with IV in Saint-Roch-de-Achigan, L'Epiphanie, Saint-Jacques, Vercheres and Lavaitrie and III in Crabtree, Sainte-Anne-des-Plaines, Lac-Lapierre, Laurentides.

Today's event of M 3.1-3.6 is near the fifth node from the Kurils and may have been enhanced by energy from that source. Forecasts 122875 and 122876 had expected today's event was likely at the end of March.

 

O: 29MAR2020 07:21:04  45.9N   73.5W MB=3.6  ECAN of Sorel-Tracy, QC             

O: 29MAR2020 07:21:04  45.8N   73.6W mb=3.1  ANSS   NNE of Mascouche Canada

O: 29MAR2020 07:21:04  45.8N   73.6W mb=3.1  EMSC   ST. LAWRENCE VALLEY REG., CANA

P: 25MAR2020 122875    46.2N   72.7W 2.0-3.8 BAAAA  New England                

P: 31MAR2020 122876    45.7N   75.2W 2.0-3.8 AAAAA  New York State             

 

An earthquake of M 4.7-4.8 in the Cook Strait shook large areas of North and South Island, New Zealand today. GEONET reported this earthquake was felt with moderate intensity in northern South Island. 1895 people reported feeling this event; 814 with weak intensity; 819 with light shaking; 234 moderate; 23 strong; 2 with severe and 3 with extreme shaking. Similar events of M 4.5-4.8 hit the area within about 100 km of this epicenter on February 13 and March 25, 2020 with the full and new moons. The last event of M>4.8 in this area of the Cook Strait occurred as an M 5.0 on September 20 and an M 4.9 on October 22, 2017. The last of significantly larger magnitude was an M 5.4 on January 5, 2017. This event occurred at 91 degrees from the Kurils and had been expected in the far-field forecast for that event as:

 

 

"Moderate far-field triggering is likely following the earthquake in the Kuril Islands. ... Regions at the fourth node (90 degrees) include Guatemala-Chiapas, Mexico, Spain, the Cook Strait, New Zealand" (March 25-27, 2020)

 

Forecast 122970 had expected today's activity was likely at the end of March within about 50 km.

 

O: 28MAR2020 12:18:09  41.7S  174.3E ML=4.7  EMSC   COOK STRAIT, NEW ZEALAND     

O: 28MAR2020 12:18:10  41.3S  174.3E ML=4.8  GEONET Felt with moderate intensity

P: 24MAR2020 122970    41.0S  174.0E 3.0-4.8 BAAAA  So. Island, N.Z.           

P: 26MAR2020 122970    41.0S  176.0E 3.0-5.0 AABAA  So. Island, N.Z.           

 

MODERATE TO STRONG QUAKES CONTINUE AT KURIL NODAL DISTANCES

 

EARTHQUAKE SUMMARY FOR MARCH 27, 2020

 

The strongest earthquakes in the world today were again at distances from the M 7.7 in the Kurils of March 25 suggesting promotion from that event. The largest of these was an M 5.8 north of New Guinea but about 600 km west of the similar event in New Guinea yesterday. Today's earthquake, however was, like its predecessor at 51-52 degrees from the Kuril epicenter. The second largest earthquake of the day was a deep focus event in Argentina of M 5.2-5.3. It was located at 143 degrees from the Kuril Islands epicenter. This is a distance at which energy is concentrated at the surface following major events and often shows major enhancement in seismicity following strong earthquakes. This, and other nodal events had been forecast in previous issues of this summary as:

 

"Moderate far-field triggering is likely following the earthquake in the Kuril Islands. Areas at about 144 degrees which are seismic include the Chile Rise near Aisen, Chile and Coquimbo and Maule as well as areas south of Africa in the Indian Ocean. Areas at about 103 degrees from the Kurils include Puerto Rico where a moderate aftershock may be expected, Mayotte, the north Central Pacific Rise which has been active over the past several days. Regions at the fourth node (90 degrees) include Guatemala-Chiapas, Mexico, Spain, the Cook Strait, New Zealand; at 72 degrees Sumatra, India, Croatia, Tonga; at 60 degrees Central Indonesia and southern California; at 51 degrees northern California and Central Philippines. These areas may see enhanced seismicity in coming days." (March 24-25, 2020)

 

An M 5.6 also hit north of central Papua, Indonesia today. This was the largest quake in the world on this day. An earthquake of M 6.1 hit about 200 km northwest of today's epicenter on November 23, 2019 - the first and only such event in the area north of New Guinea in the past 30 years. Triggering at nodal distances from major earthquakes often results in unusual epicenters having events as pent up stress is released by the minor energies from afar.   Forecast 122765 had expected a moderate to large quake in this area was likely at the end of March.

 

BMG reported this earthquake of M 5.5 in New Guinea Indonesia  was felt with intensity II-III in the area(s) of Manokwan, New Guinea.

 

Another area which saw enhanced seismicity in central Indonesia today was the

Sulawesi region. A moderately strong quake may be about to occur in this area as well. Other moderate quakes in Indonesia at nodal distances from the Kurils included an M 4.7 south of Bali (node 5); and an M 4.7 in Mindanao, Phlippines (node 7) and an M 5.0 in New Britain (node 7).

 

O: 27MAR2020 14:32:48   0.2N  133.6E Mw=5.6  EMSC   PAPUA REGION, INDONESIA       

O: 27MAR2020 14:32:48   0.2N  133.6E Mw=5.6  BMG    PAPUA REGION, INDONESIA      

P: 31MAR2020 122765     2.0S  134.0E 4.0-5.5 BCAAA  West Irian, PNG            

 

The second strongest earthquake in the world today was an M 5.2 in the area of

Santiago Del Estero, Argentina. While this was a deep focus event, it was reported felt lightly in Argentina. The last earthquake of larger magnitude within about 200 km of this epicenter was an M 5.5 on March 1, 2019 and prior to that an M 5.6 on July 20, 2018. Two events of M 6.0 and 5.5 occurred about 200 km north west of this epicenter on December 24, 2019 and January 23, 2020. Forecast 122949 had expected today's event was likely in this area around March 27. This epicenter is at 143 degrees from the Kuril mainshock and is likely to have been promoted by energy from that source.

 

O: 27MAR2020 17:42:49  28.8S   63.1W Mw=5.2  EMSC   SANTIAGO DEL ESTERO, ARGENTINA

P: 27MAR2020 122949    27.0S   63.0W 4.0-5.3 ABAAA  Argentina                  

 

Among today's events was a near-antipodal aftershock in the South Sandwich Islands of the M 5.3-5.7 which occurred there yesterday. This summary had noted in the previous issue in this regard:

 

"A moderately strong earthquake was also reported in the South Sandwich Islands region of the South Atlantic with M 5.3-5.7. This is located near the antipode of the M 7.7 in the Kurils but was not felt in the epicentral region. The last event in the northern South Sandwich Islands area of M>=5.3 occurred on  January 9, 2020 - also with M 5.3-5.4 with the last of larger magnitude an M 6.1 on November 2, 2019.  Forecast 122976 had expected today's event was likely around March 27 within about 100 km of the epicenter.

 

In the previous issue of this summary the possibility of such an event at this time had been noted as:

 

"A listing of locations where far-field triggering from the M 7.7 in the Kuril Islands of March 25, 2020 was provided in the previous issue of this report. This did not include several regions of importance. Regional and local triggering in the area of Kamchatka and the Kurils is possible. At the antipode near the South Sandwich Islands in the South Atlantic triggering is also likely." (March 26, 27, 2020)

 

O: 27MAR2020 21:26:21  56.0S   27.1W mb=4.8  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 27MAR2020 122976    56.0S   28.0W 4.0-5.6 AAAAA  So. Sandwich Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in Southern Alaska. NEIC reported this earthquake of M 3.8 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska at Valdez, Chugiak, Eagle River, Fort Richardson, Anchorage. This is the largest earthquake within about 150 km of this epicenter since an M 4.3 on October 16, 2018. Forecast 122918 had expected a moderate event in this area was likely at the end of March.

 

O: 27MAR2020 18:49:56  61.4N  146.6W ML=4.0  EMSC   SOUTHERN ALASKA              

P: 31MAR2020 122918    60.1N  148.4W 3.2-4.8 BBAAA  Central Alaska             

 

DAL SEISMICITY STRONG FOLLOWING M 7.7 KURIL EVENT

 

EARTHQUAKE SUMMARY FOR MARCH 26, 2020

 

Strong seismicity concentrated today at the seventh node (51-54 degrees) and at the  antipode of the M 7.7 Kuril Islands event of March 25, 2020. A moderately strong M 5.7, also at the seventh node from the Kurils also occurred in Papua New Guinea today and a strong M 6.1 rocked Mindanao, Philippines. Other unusual seismicity at nodal distances from the Kuril event occurred in western Texas (M 5.0 at 72 degrees - node 5 - strongest regional event in 15 years) and Algeria (M 5.0 at 90 degrees - node 4 - strongest in the area in nearly 4 years). An M 5.4 in Southern Iran was also located near the fifth node from the Kurils. An M 5.3-5.7 also occurred in the South Sandwich Islands near the antipode of the Kuril Islands epicenter.

 

The strongest of today's quakes was an M 6.1 in Mindanao, Philippines. It was felt with minor damage in Southern Mindanao at Baliton, Tinoto and Buayan; V in San Jose South Cotabato, Polomolok, Sulit and III in Koronadal, Ula, Samal, and Davao, Mindanao, Philippines. PHIVOLCS reported intensity V in Glan, Maasim, Alabel, Kiamba and Malapatan, Sarangani, Tupi, South Cotabato, General Santos City, Palimbang, Sultan Kudarat; IV in Jose Abad Santos, Malita and Saranganim Davao Occidental; Koronadal City, Polomolok and Tampakan, South Cotabato; III in Davao City, Maco and Mawab, Davao de Oro, Digos City, Cotabato City and II in Zamboanga City. Damage and aftershocks occurred and were expected. It was located, like the earlier New Guinea quake at 51-52 degrees (node 7) from the Kuril Islands. Philippine online news reported some damage. BMG reported it was felt with intensity III-IV in Indonesia at Tahuna and Melonguane and II-III in Siau, Manado and Bitung, PNG, Indonesia. This is the latest event in a series of strong quakes in Mindanao which started in October 2019. The last in this series of events in Mindanao of M>=6.1 occurred on December 15, 2019 with M 6.8 with earlier events in late October of M 6.4, 6.6 and 6.5. All of this earlier activity had occurred 100-150 km north of today's epicenter. Forecast 122744 had expected today's mainshock was likely within about 50 km of this epicenter around March 26. Today's earthquake occurred at 51.4 degrees from the Kuril Island epicenter - exactly at node 7 - and was most likely promoted by energy from that source. It may also have been promoted by tidal effects as it occurred within minutes of local solar midnight.

 

O: 26MAR2020 15:38:02   5.8N  125.1E Mw=6.1  EMSC   MINDANAO, PHILIPPINES        

O: 26MAR2020 15:38:03   5.7N  125.2E mw=6.1  ANSS   SW of Baliton Philippines

O: 26MAR2020 15:38:02   5.6N  125.2E Mw=6.3  BMG    MINDANAO, PHILIPPINES        

P: 26MAR2020 122744     6.0N  125.0E 4.0-5.3 AAAAA  Mindanao, Philippines      

 

An M 5.9 occurred today also in the area near the north coast of Papua New Guinea. BMG reported it was felt with intensity II-III in Sarmi and II in Jayapura and Wamena. Like the M 6.1 in the area of Mindanao, this is also located near the 7th node (53-54 degrees) from the Kurils. Further activity in the next several days is likely to occur in central Indonesia due to energy from the Kuril Islands. Today's event is the strongest event within about 200 km of this epicenter since an M 6.0 on January 18, 2020 and an M 6.1 on June 24, 2019.

This earlier activity was followed about a 10-20 days later by a significant uptick in seismicity in Southern California - including the M 7.1 in Ridgecrest on July 6 2019. Similar increases may be seen in early April, 2020. Southern California is at 103 degrees from this epicenter in New Guinea and has been activated by large quakes there on many occasions in the past. Forecast 122766 expected today's epicenter would be active at the end of March within about 10-20 km.

 

O: 26MAR2020 19:49:21   2.8S  139.3E ML=4.8  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O: 26MAR2020 21:36:42   2.9S  139.1E Mw=5.8  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O: 26MAR2020 21:36:42   2.7S  139.3E Mw=5.9  BMG    NEAR N COAST OF PAPUA, INDONESIA

O: 27MAR2020 06:27:19   2.9S  139.4E mb=4.5  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O: 27MAR2020 02:49:03   3.0S  139.2E mb=4.5  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O: 26MAR2020 21:56:58   2.8S  139.3E ML=4.3  EMSC   NEAR N COAST OF PAPUA, INDONES

P: 31MAR2020 122766     3.0S  139.0E 4.0-5.3 BAAAA  West Irian, PNG            

 

Much of the more unusual activity in the world today at lighter magnitude levels was also concentrated near nodal distances from the Kurils as expected in earlier issues of this report:

 

"Moderate far-field triggering is likely following the earthquake in the Kuril Islands. Areas at about 144 degrees which are seismic include the Chile Rise near Aisen, Chile and Coquimbo and Maule as well as areas south of Africa in the Indian Ocean. Areas at about 103 degrees from the Kurils include Puerto Rico where a moderate aftershock may be expected, Mayotte, the north Central Pacific Rise which has been active over the past several days. Regions at the fourth node (90 degrees) include Guatemala-Chiapas, Mexico, Spain, the Cook Strait, New Zealand; at 72 degrees Sumatra, India, Croatia, Tonga; at 60 degrees Central Indonesia and southern California; at 51 degrees northern California and Central Philippines. These areas may see enhanced seismicity in coming days." (March 24-25, 2020)

 

The strongest earthquake in the U.S. or Canada today was an M 5.0 in western Texas. NEIC reported it was felt with intensity IV in Salt Flat, Texas and III in Pecos, Mentone, Van Horn, Balmornea, Monahans, Fort Davis, and in New Mexico at Artesia, Carlsbad, and Loving among others. It was reported felt as far as Missouri, Mississippi, Iowa and in Michoacan, Mexico. An M 3.8 foreshock preceded the mainshock and was felt with intensity III within about 200 km of the epicenter. NEIC reported aftershocks of M 3.0 and 3.1 in western Texas were felt with intensity II-III in the area(s) of Western Texas at Pecos and El Paso.

This epicenter is at the fifth node (72 degrees) from the Kuril Islands M 7.7 quake of March 25 and was probably promoted by energy from that source. The mainshock was followed by a series of light aftershocks. Today's earthquake is the strongest in Western Texas since an M 5.7 on April 14, 1995 about 200 km southeast of today's epicenter. An M 5.0 also hit northeast of this bye about 150 km on January 2, 1992 - the only such events in the past 30 years in the region. Forecast 122836 had expected today's event within about 50 km was likely around March 27.

 

O: 26MAR2020 16:16:16  31.7N  104.0W ML=3.0  EMSC   WESTERN TEXAS

O: 26MAR2020 18:52:26  31.7N  104.0W ML=3.1  EMSC   WESTERN TEXAS

O: 26MAR2020 08:52:42  31.7N  104.0W Mw=3.8  EMSC   WESTERN TEXAS

O: 26MAR2020 15:16:29  31.7N  104.0W Mw=5.0  EMSC   WESTERN TEXAS

O: 26MAR2020 15:16:28  31.7N  104.1W mw=5.0  ANSS   W of Mentone Texas

O: 26MAR2020 18:29:00  31.7N  104.1W ML=3.0  EMSC   WESTERN TEXAS                

P: 27MAR2020 122836    31.6N  104.6W 2.0-3.8 AAAAA  SW U.S.A                   

 

An M 5.0 was widely felt today in Algeria. NEIC reported maximum intensity VI in Algeria at Merourana Batnah; V in al-Ulmah, Satif, Ras el Aioun, and IV in Tajananah, Milah, Satif, Batna, Ayn and Fajj Mazallah. The last earthquake in Algeria within about 200 km of today's epicenter with M>=5 occurred as an M 5.3 on November 18, 2016 and prior to that an M 5.2 on May 28, 2016. Forecast 122856 had expected today's activity in this area was likely around March 24. This epicenter is at 90 degrees (node 4) from the M 7.7 in the Kuril Islands and was probably promoted by energy from that source.

 

O: 26MAR2020 07:09:26  35.8N    5.7E mb=5.0  EMSC   NORTHERN ALGERIA             

P: 24MAR2020 122856    37.0N    4.0E 3.0-4.3 ABBAA  Western Mediterranean      

 

A moderately strong earthquake was also reported in the South Sandwich Islands region of the South Atlantic with M 5.3-5.7. This is located near the antipode of the M 7.7 in the Kurils but was not felt in the epicentral region. The last event in the northern South Sandwich Islands area of M>=5.3 occurred on  January 9, 2020 - also with M 5.3-5.4 with the last of larger magnitude an  M 6.1 on November 2, 2019.  Forecast 122976 had expected today's event was likely around March 27 within about 100 km of the epicenter.

 

In the previous issue of this summary the possibility of such an event at this time had been noted as:

 

"A listing of locations where far-field triggering from the M 7.7 in the Kuril Islands of March 25, 2020 was provided in the previous issue of this report. This did not include several regions of importance. Regional and local triggering in the area of Kamchatka and the Kurils is possible. At the antipode near the  South Sandwich Islands in the South Atlantic triggering is also likely." (March 26, 2020)

 

O: 26MAR2020 20:24:54  56.7S   27.0W Mw=5.7  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 26MAR2020 20:24:54  56.7S   27.0W Mw=5.3  ANSS   SOUTH SANDWICH ISLANDS REGION

P: 27MAR2020 122976    56.0S   28.0W 4.0-5.6 AAAAA  So. Sandwich Islands       

 

A series of light aftershocks also hit the region of Salt Lake City, Utah today. The largest of these were in the low magnitude 3 range. It is the strongest series of aftershocks in the area since those on March 18 associated with the M 5.6 which damaged the area of Salt Lake City. Forecast 122855 had expected today's enhanced aftershocks were likely around March 27.

 

These events are at 60 degrees (node 6) from the Kuril Islands and were probably promoted by energy from that event.

 

NEIC reported these earthquakes of M 3.0-3.3 in Salt Lake City, Utah  was felt with intensity II-III in the area(s) of Salt Lake City, Utah at Salt Lake City (IV).

 

O: 26MAR2020 16:12:43  40.8N  112.0W ML=3.2  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 26MAR2020 16:16:39  40.8N  112.0W Ml=2.0  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 26MAR2020 11:56:12  40.8N  112.0W Ml=2.3  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 26MAR2020 19:10:02  40.8N  112.0W Ml=2.3  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 26MAR2020 14:56:49  40.8N  112.1W Ml=2.1  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 26MAR2020 16:21:56  40.8N  112.0W ML=3.0  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 26MAR2020 16:12:42  40.8N  112.0W ml=3.3  ANSS   Salt Lake City Utah

P: 27MAR2020 122855    40.3N  112.0W 2.0-3.8 AAAAA  Utah area                   

 

The strongest earthquake in the region of California north to Washington today was an M 3.0 off the coast of Northern California. This is a somewhat unusual event at 52 degrees (node 7) from the Kurils, northwest of the recent activity in the area. The last event with M>=3 within about 50 km of this epicenter occurred on May 11, 2019 about 50 km to the north when a series followed an M 4.0 and 4.3. Forecast 122881 had expected today's event in this area around March 25. A series of earthquakes of M 2-3 also shook the Ridgecrest, California aftershock zone today. These are at the 6th node from the Kurils (60 degrees).

 

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

 

O: 26MAR2020 20:53:30  41.3N  126.0W Md=3.0  EMSC   OFF COAST OF NORTHERN CALIFORN

P: 25MAR2020 122881    41.8N  126.9W 2.5-4.3 AAAAA  Off Coast of No. Calif     

 

The earthquake of M 5.4 in southern Iran today was the largest within about 200 km of that epicenter since an M 5.7 on June 15, 2011. More recent activity at this magnitude level or higher - all of which was M 5.4-5.5 - has occurred south or west of today's epicenter. This event is located near the fifth node from the Kuril Islands. Forecast 122802 had expected this activity within about 150 km at the end of March.

 

O: 27MAR2020 06:40:42  28.3N   57.2E mb=5.4  EMSC   SOUTHERN IRAN                

P: 24MAR2020 122802    28.0N   55.0E 3.5-4.8 BABAA  So. Iran/Persian Gulf      

P: 31MAR2020 122802    27.0N   56.0E 3.5-4.9 BBAAA  So. Iran/Persian Gulf      

 

Following is a listing of some of today's important events and their Distance from the Kuril Islands:

 

Antipodal:

 

South Sandwich Islands M 5.3-5.7 - 172 degrees

 

140-145 degrees:

 

Maule Chile M 4.6 - 140 degrees

 

101-103 degrees:

 

Puerto Rico, Dominican Republic series M 3-4 - 102 degrees

 

90 degrees (node 4):

 

Chiapas Mexico, M 4.7 - 90 degrees

Oaxaca, Mexico, M 4.2 - 88 degrees

Algeria, M 5.0 - 91 degrees

 

72 degrees (node 5):

 

Western Texas, M 5.0 - 72 degrees

Sumba, Indonesia M 4.3 - 72 degrees

Bali, Indonesia M 4.1, 4.8 - 71 degrees

Oklahoma, M 3.4  - 72 degrees

 

60 degrees (node 6):

 

Southern California, M 2-3 - 60 degrees

Utah, M 3-4 - 60 degrees

Tajikistan, M 4.4 - 60 degrees

 

51-52 degrees (node 7):

 

Papua New Guinea M 5.9 - 54 degrees

Northern California M 3.0 - 52 degrees

Mindanao, Philippines M 6.1-6.3 - 51.4 degrees

 

AFTERSHOCKS CONTINUE IN KURIL ISLANDS

 

EARTHQUAKE SUMMARY FOR MARCH 25, 2020

 

Moderate near and far aftershocks continued in the region of the Kuril Islands today following the M 7.7 earlier in the day. Minor tsunamis of up to 40 cm were observed in Kamchatka following the M 7.7 in the Kuril Islands today.

 

A listing of locations where far-field triggering from the M 7.7 in the Kuril Islands of March 25, 2020 was provided in the previous issue of this report.

This did not include several regions of importance. Regional and local triggering in the area of Kamchatka and the Kurils is possible. At the antipode near the South Sandwich Islands in the South Atlantic triggering is also likely. Also, directly south of the Kuril epicenter at 103 degrees distance lies the Macquarie Island region. This area south of New Zealand and Australia is active and may also see enhanced seismicity in the near future. The original expectation for far-field triggering in the previous issue of this report had read:

 

 

“Moderate far-field triggering is likely following the earthquake in the Kuril Islands. Areas at about 144 degrees which are seismic include the Chile Rise near Aisen, Chile and Coquimbo and Maule as well as areas south of Africa in the Indian Ocean. Areas at about 103 degrees from the Kurils include Puerto Rico where a moderate aftershock may be expected, Mayotte, the north Central Pacific Rise which has been active over the past several days and the Galapagos. Regions at the fourth node (90 degrees) include Guatemala-Chiapas, Mexico, Spain, the Cook Strait, New Zealand; at 72 degrees Sumatra, India, Croatia, Tonga; at 60 degrees Central Indonesia and southern California; at 51 degrees northern California and Central Philippines. These areas may see enhanced seismicity in coming days.” (March 25, 2020)

 

Following are earthquakes today which match these nodal expectations:

 

144-149 degrees (node 7):

 

O: 26MAR2020 03:58:06  19.7S   12.0W mb=4.7  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

O: 26MAR2020 05:58:34  19.9S   11.8W mb=5.1  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P: 20MAR2020 122715    20.0S   12.0W 4.0-5.3 CAAAA  So. Mid-Atlantic Ridge     

 

101-104 degrees (node 7):

 

O: 25MAR2020 23:11:35  17.8N   66.9W ML=3.8  EMSC   PUERTO RICO REGION           

P: 27MAR2020 122785    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

90 degrees (node 4):

 

 

O: 26MAR2020 07:09:26  35.8N    5.7E mb=5.0  EMSC   NORTHERN ALGERIA             

P: 24MAR2020 122856    37.0N    4.0E 3.0-4.3 ABBAA  Western Mediterranean      

 

O: 25MAR2020 08:21:17  13.9N   93.5W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 24MAR2020 122770    14.0N   93.0W 3.5-5.1 AAAAA  Chiapas, Mexico            

 

72 degrees (node 5):

 

O: 26MAR2020 04:26:37   8.9S  108.6W mb=4.6  EMSC   CENTRAL EAST PACIFIC RISE    

P: 23MAR2020 122738     4.0S  105.0W 4.0-5.4 BCCAA  Central Pacific Ocean      

 

O: 24MAR2020 22:24:31  50.3N   63.6W MB=1.4  ECAN Havre-Saint-Pierre, QC         

O: 24MAR2020 20:14:30  50.3N   63.6W MB=2.4  ECAN Havre-Saint-Pierre, QC         

P: 24MAR2020 122863    49.0N   66.0W 2.0-3.8 ABBAA  E. of Maine                

 

60 degrees (node 6):

 

O: 25MAR2020 07:46:57  36.1N  117.9W ML=2.0  EMSC   CENTRAL CALIFORNIA           

O: 25MAR2020 12:43:23  36.1N  117.9W Ml=2.0  EMSC   CENTRAL CALIFORNIA           

P: 25MAR2020 122844    35.5N  117.4W 2.5-4.3 AAAAA  So. California             

 

O: 25MAR2020 16:42:51   5.0S  130.6E mb=4.3  EMSC   BANDA SEA                    

P: 31MAR2020 122750     4.0S  129.0E 4.0-5.3 CABAA  Ceram area                  

 

O: 26MAR2020 04:44:31  40.8N   70.5E mb=5.0  EMSC   TAJIKISTAN                   

P: 26MAR2020 122822    36.0N   71.0E 3.8-5.2 ACAAA  Hindu Kush/Pakistan        

 

O: 25MAR2020 12:51:30  28.0N   85.0E ML=4.0  EMSC   NEPAL                        

P: 24MAR2020 122798    27.0N   88.0E 3.5-5.3 AACAA  Nepal                      

 

52 degrees (node 7):

 

O: 26MAR2020 00:58:42  40.4N  125.2W ML=2.6  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 24MAR2020 122881    40.6N  124.5W 2.5-4.3 AAAAA  Off Coast of No. Calif     

P: 31MAR2020 122880    40.5N  125.8W 2.5-4.4 BAAAA  Off Coast of No. Calif     

 

Forecast 122874 had expected today's Kuril Island activity within about 100 km of these epicenter was likely around March 27. For more details see the previous issue of this summary.

 

O: 25MAR2020 11:26:00  49.2N  157.8E mb=4.4  EMSC   EAST OF KURIL ISLANDS

O: 25MAR2020 08:01:16  49.2N  157.9E mb=4.6  EMSC   EAST OF KURIL ISLANDS

O: 25MAR2020 08:36:56  49.3N  158.0E mb=4.5  EMSC   EAST OF KURIL ISLANDS

O: 26MAR2020 04:23:49  49.4N  158.0E mb=4.3  EMSC   EAST OF KURIL ISLANDS

O: 25MAR2020 09:28:59  49.4N  158.5E mb=4.3  EMSC   EAST OF KURIL ISLANDS

O: 25MAR2020 11:13:42  49.5N  158.5E mb=4.3  EMSC   EAST OF KURIL ISLANDS

O: 25MAR2020 20:21:12  49.6N  158.6E mb=4.4  EMSC   EAST OF KURIL ISLANDS

O: 26MAR2020 02:58:48  49.9N  159.0E mb=4.4  EMSC   EAST OF KURIL ISLANDS

O: 26MAR2020 05:22:06  48.8N  157.9E mb=4.6  EMSC   EAST OF KURIL ISLANDS        

O: 25MAR2020 17:21:43  49.1N  158.2E mb=5.1  EMSC   EAST OF KURIL ISLANDS         

O: 26MAR2020 07:17:00  49.7N  154.3E mb=4.7  EMSC   KURIL ISLANDS                

P: 27MAR2020 122874    49.0N  156.0E 3.5-5.3 AAAAA  NE Pacific                 

 

The strongest earthquake in the world following the M 7.7 in the Kuril Islands occurred in southern Japan in the Volcano Islands with M 5.6. It was not reported felt in this remote area. The last earthquake in the Volcano Islands within about 200 km of today's epicenter with M>=5.6 was an M 6.3 on August 16-17, 2018 (plus an M 5.8 foreshock and an M 5.6 aftershock). Forecast 122805 had expected today's activity within about 100 km was likely around March 26.

 

O: 26MAR2020 05:52:49  22.7N  143.3E mb=5.6  EMSC   VOLCANO ISLANDS, JAPAN REGION

P: 26MAR2020 122805    22.0N  144.0E 4.0-5.4 AAAAA  Volcano Islands            

 

An M 5.0 was widely felt today in Algeria. NEIC reported maximum intensity VI in Algeria at Merourana Batnah; V in al-Ulmah, Satif, Ras el Aioun, and IV in Tajananah, Milah, Satif, Batna, Ayn and Fajj Mazallah.

The last earthquake in Algeria within about 200 km of today's epicenter with M>=5 occurred as an M 5.3 on November 18, 2016 and prior to that an M 5.2 on May 28, 2016. Forecast 122856 had expected today's activity in this area was likely around March 24. This epicenter is at 90 degrees (node 4) from the M 7.7 in the Kuril Islands and was probably promoted by energy from that source.

 

O: 26MAR2020 07:09:26  35.8N    5.7E mb=5.0  EMSC   NORTHERN ALGERIA             

P: 24MAR2020 122856    37.0N    4.0E 3.0-4.3 ABBAA  Western Mediterranean      

 

The strongest earthquake in the U.S. or Canada today was an M 3.8-4.1 in the Geysers area of northern California. NEIC reported maximum intensity IV in Middletown and Kelseyville and III in Geyserville, Healdsburg, Hidden Valley, Lower Lake, Windsor, Calistoga and Clearlake, California. The last earthquake in the Geysers area within about 50 km of this epicenter with M>=4.1 occurred on November 3, 2019 when an M 4.2 occurred. The last earthquake in the area of magnitude significantly larger than M 4.1-4.2 was an M 5.0 on December 14, 2016.

Forecast 122817 had expected this activity at the end of March.

 

O: 25MAR2020 11:57:37  38.8N  122.7W mb=3.8  EMSC   NORTHERN CALIFORNIA          

O: 25MAR2020 11:57:38  38.8N  122.8W mb=4.1  ANSS   NORTHERN CALIFORNIA          

O: 26MAR2020 00:40:21  38.8N  122.8W Md=2.3  EMSC   NORTHERN CALIFORNIA          

P: 25MAR2020 122817    38.7N  122.7W 2.5-4.3 AAAAA  Central California         

P: 29MAR2020 122817    38.9N  122.8W 2.5-4.4 BAAAA  Central California         

 

A series of light aftershocks also occurred in Central California along the

San Andreas north of Parkfield today. The largest of these was an M 3.0.

NEIC reported this earthquake of M 2.9 in Central California  was felt with intensity II-III in the area(s) of Central California at Los Banos and Hollister. The series began near local solar noon and was probably promoted by the new moon tidal stresses. Forecast 122813 had expected activity in the area was likely at the end of March. This activity is at the sixth node (60 degrees) from the M 7.7 in the Kuril Islands earlier in the day and was probably promoted by energy from that source.

 

O: 25MAR2020 22:58:02  36.1N  120.6W Md=2.7  EMSC   CENTRAL CALIFORNIA

O: 25MAR2020 23:16:22  36.2N  120.1W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 25MAR2020 22:42:38  36.2N  120.2W Md=2.3  EMSC   CENTRAL CALIFORNIA

O: 25MAR2020 23:13:04  36.5N  120.5W Md=3.0  EMSC   CENTRAL CALIFORNIA

O: 25MAR2020 21:50:29  36.1N  120.4W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P: 30MAR2020 122813    36.2N  120.8W 2.5-4.3 BAAAA  Central California         

 

An unusually large M 3.6 also occurred today in the region of Nunavut, Canada north of Wisconsin and Minnesota. This is the strongest event recorded by EMSC within about 200 km of this active epicenter since an M 4.2 on March 10, 2012 and prior to that a series of quakes in February, March and April, 2008 of M 3.6-4.4.  Forecast 122927 had expected today's event within about 100 km of the epicenter was likely around March 25. It is located near the seventh node from the Kuril Islands.

 

O: 25MAR2020 09:35:55  64.9N   88.2W MB=3.6  ECAN Repulse Bay, NU   

O: 25MAR2020 09:35:55  64.9N   88.2W ML=3.6  EMSC   NUNAVUT, CANADA              

P: 25MAR2020 122927    64.0N   87.0W 2.5-3.8 AAAAA  Nunavit/Hudson Bay, Canada 

 

An earthquake of M 3.8 south of Puerto Rico today occurred about 20 km from the active aftershock zone near Ponce, Puerto Rico. Three events of M 3.9-4.0 have occurred in the area in the past 12 years - on January 13 and February 8, 2020 and one occurred on January 16, 2008 with M 4.2, the only such events in the region in the past 30 years. This suggests today's event may have been enhanced by external energy associated with the new moon and/or the M 7.7 in the  Kurils which is located at 102 degrees from this epicenter. Forecast 122785 had expected this activity around March 27.

 

O: 25MAR2020 23:11:35  17.8N   66.9W ML=3.8  EMSC   PUERTO RICO REGION           

P: 27MAR2020 122785    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

MAJOR M 7.7 IN KURILS ASSOCIATED WITH NEW MOON

 

EARTHQUAKE SUMMARY FOR MARCH 24, 2020

 

A major earthquake of M 7.7 struck off the Kuril Islands north of Japan today. PTWC issued a tsunami warning, but it was later cancelled for the Island of Hawaii. JMA indicated that minor tsunami waves may occur in eastern Japan.

Tsunami waves are expected in Hawaii, Japan, Russia, the Pacific Islands of Midway, the northern Mariana Islands and Wake Island with heights up to 0.3 meters (about a foot). The China Earthquake Information Center reported M 7.4 while the Russians M 7.5. JMA reported light shaking from the M 7.8 event in some areas of Hokkaido and Honshu but not shaking of intensity III or greater was reported. NEIC reported maximum intensity V in Severo-Kurilsk, Russia and IV in Petropavlovsk and Mohovaja, Kamchatka. It was also reported felt lightly in Adak, Alaska. This earthquake was probably promoted by tidal stresses. It occurred on the day of the new moon within about an hour of local solar noon - a time when tidal stresses are maximized. The history of strong earthquakes in this area of the Kuril Islands (see below) indicates a strong relation with past new moon alignments. The tidal forecast had read:

 

"The new moon will arrive on March 24, 2020 at 09:28 UT. Longitudes which are antisolar at this time are near 142 West and 38 East longitudes. These include areas of southern Alaska and western North America, Hawaii in the west and Turkey, Greece and eastern Mediterranean in the east. These areas may experience enhanced seismicity during the period March 21-28 with the possibility of a strong earthquake in the world with a component of tidal triggering. Tidal triggering can occur in many areas and other regions may also see promoted seismicity during this seven-day period." (March 21-24, 2020)

 

The last major earthquakes in the world were an M 7.7 south of Cuba near the Cayman Islands in the Caribbean on January 28; an M 6.9 in eastern Turkey on January 24 and an M 7.0 in the Kuril Islands on February 13, 2020.  The event on February 13 in the Kuril Islands occurred several days after the full moon. The earthquake of M 6.8 in eastern Turkey on January 24, 2020 was probably also triggered by that new moon as noted in this summary at the time:

 

"This summary had expected it in the tidal forecast published in previous issues as:

 

"The New Moon will arrive on January 24, 2020 at 21:42 UT. Longitudes which are at local solar midnight at this time are near 40 East while those which are at local solar noon (subsolar) are near 140 West. These include areas of eastern Turkey and eastern Europe in the east and in eastern Alaska south to British Columbia, Canada in the west. While many areas of the world can be activated by tidal stresses these are the areas which see the strongest tidal stresses with this new moon. Global seismicity is expected to be slightly enhanced during the coming week." (January 22-24, 2020)

 

 

An earthquake of M 3.5 in Utah was reported felt about 10 minutes after the M 7.7 in the Kuril Islands. The passage time for a P-wave between these two points is also 10 minutes (distance 61 degrees). It is possible this is an error in the occurrence of the Utah event or that it was triggered by the passing p-wave. A reported event of M 3.8 north of Iceland was listed 40 seconds after the event in Utah by EMSC. Iceland is at 65 degrees from the Kuril event and this too may be a ghost event or a case of real triggering. An earthquake listed in British

Columbia with M 4.2 by EMSC had a similar problem. It was listed as occurring 7.5 minutes after the Kuril event, the same time as it takes a p-wave to traverse the 45 degrees distance between these two epicenters.

 

O: 25MAR2020 02:59:12  41.2N  111.3W Ml=3.5  EMSC   UTAH                         

O: 25MAR2020 02:57:01  50.2N   18.6E ML=2.5  EMSC   POLAND                       

O: 25MAR2020 02:59:48  66.0N   18.3W ML=3.8  EMSC   ICELAND                      

O: 25MAR2020 02:56:51  53.7N  127.6W ML=4.2  EMSC   BRITISH COLUMBIA, CANADA     

 

Among likely events following the M 7.7 in the Kuril Islands was an M 4.8 in the Cook Strait of New Zealand. This occurred several hours later and is unlikely a ghost quake. It occurred at the fourth node (90 degrees) from the Kuril Islands and was probably promoted by energy from that event. An earthquake near Maule, Central Chile of M 4.6 followed two minutes after the New Zealand event. This epicenter is at 141 degrees from the Kuril Islands - a distance at which triggering is likely due to the concentration of seismic energy after internal reflections and refractions off the core-mantle boundary returns this energy to the surface in this distance range. Several light earthquakes in Puerto Rico at 102-103 degrees from this Kuril epicenter may also have been promoted by energy from the major quake.

 

GEONET reported the event in New Zealand after the Kuril Islands earthquake was felt with moderate intensity in northern South Island. 599 people reported feeling this event; 414 with weak intensity; 159 with light shaking; 22 moderate; 2 strong; 0 with severe and 2 with extreme shaking. NEIC reported this earthquake of M 4.8 in  South Island, New Zealand was felt with intensity II-III in the area(s) of South Island, New Zealand at Seddon, Marlborough, New Zealand.

The last earthquake in this area within about 150 km of this epicenter with M>=4.8 occurred on October 22, 2017 with M 4.9. An M 5.1 about 150 km northeast of this occurred with the New Moon on January 25, 2020. Forecast 122970 had expected this earthquake was likely around March 24 within about 100 km of this epicenter.

 

O: 25MAR2020 05:51:21  41.9S  174.2E mb=4.8  EMSC   COOK STRAIT, NEW ZEALAND     

O: 25MAR2020 05:51:22  41.9S  174.1E ML=4.4  GEONET Felt with moderate intensity

P: 24MAR2020 122970    41.0S  174.0E 3.0-4.8 AAAAA  So. Island, N.Z.           

 

NEIC reported the earthquake of M 3.2 in Puerto Rico  was felt with intensity II-III in the area(s) of Puerto Rico at San Juan.

 

O: 25MAR2020 04:18:12  17.9N   66.8W MD=3.2  EMSC   PUERTO RICO REGION

P: 27MAR2020 122785    18.0N   67.0W 3.4-4.8 BAAAA  Puerto Rico                

 

Moderate far-field triggering is likely following the earthquake in the Kuril Islands. Areas at about 144 degrees which are seismic include the Chile Rise near Aisen, Chile and Coquimbo and Maule as well as areas south of Africa in the Indian Ocean. Areas at about 103 degrees from the Kurils include Puerto Rico where a moderate aftershock may be expected, Mayotte, the north Central Pacific Rise which has been active over the past several days and the Galapagos. Regions at the fourth node (90 degrees) include Guatemala-Chiapas, Mexico, Spain, the Cook Strait, New Zealand; at 72 degrees Sumatra, India, Croatia, Tonga; at 60 degrees Central Indonesia and southern California; at 51 degrees northern California and Central Philippines. These areas may see enhanced seismicity in coming days.

 

The Kuril Islands are no stranger to major earthquakes. The last great earthquake of M>=7.7 in the Kuril Islands was an M 8.1 on January 13, 2007.

This earthquake also generated a minor tsunami. It was closely associated with the new moon of January 12, 2007 as noted in this summary at the time. That event was felt as far as Honshu, Japan and this is likely the case with the current event as well. It followed an M 8.3 on November 15, 2006. The last within about 200 km of today's event with M>=6 was an M 6.5 on October 9 and 10, 2018. This earthquake was also closely related to the new moon which occurred on October 9, 2018. The strongest prior to that was an M 6.0 on August 10, 2018. That event too, was associated with the New Moon - on August 11, 2018.

 

Forecast 122874 had expected moderate to strong seismicity about 100 km to the west of today's epicenter was likely in the Kuril Islands around March 27. Today's epicenter is at 102 degrees from recent strong earthquakes in Puerto Rico and may have been promoted by seismic energy from those continuing events. It is also at the 6th node (60 degrees) from the M 7.1 in Ridgecrest, California of July, 2019 and from the M 5.7 in Salt Lake City last week.

 

O: 25MAR2020 03:48:44  49.2N  157.5E mb=4.3  EMSC   EAST OF KURIL ISLANDS

O: 25MAR2020 04:03:05  49.4N  157.7E mb=4.7  EMSC   EAST OF KURIL ISLANDS

O: 25MAR2020 02:49:21  49.0N  157.7E mw=7.5  ANSS   SSE of Severo-Kuril'sk Russia

O: 25MAR2020 02:49:21  49.0N  157.7E mw=7.4  CEIC   Kuril Islands

O: 25MAR2020 02:49:21  49.0N  157.7E mw=7.8  JMA    Kuril Islands                   

O: 25MAR2020 02:49:20  49.0N  157.7E Mw=7.6  EMSC   EAST OF KURIL ISLANDS        

P: 27MAR2020 122874    49.0N  156.0E 3.5-5.3 AAAAA  NE Pacific                 

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 in the Andreanof Islands of Alaska. A similar event occurred yesterday to the west of today's epicenter. In the previous issue of this summary it was addressed as:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 4.9 in the Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last earthquake of M>=4.9 within about 150 km of today's epicenter was an M 6.2 within about 25 km of today's epicenter. Today's M 4.9 appears to be the strongest aftershock to date of that event. Forecast 122669 had expected this activity was likely in mid-March." (March 23-24, 2020)

 

Forecast 122669 had expected today's event within about 50 km aroud March 21.

 

O: 24MAR2020 07:11:12  51.1N  175.1W mb=4.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 21MAR2020 122669    50.6N  174.7W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

A swarm of light earthquakes also occurred in the Mammoth Lakes area of central California today. The largest of these was an M 2.8. These occurred near local solar noon and may have been promoted by the new moon. Forecast 122810 had expected activity in the Mammoth Lakes area around March 25.

 

NEIC reported these earthquakes of M 2.6 and 2.8 in Mammoth Lakes, California  were felt with intensity II-III in the area(s) of Mammoth Lakes, California.

 

O: 24MAR2020 18:01:11  37.6N  118.9W Md=2.2  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 24MAR2020 19:00:03  37.6N  118.9W Md=2.2  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 24MAR2020 17:02:31  37.6N  118.9W Md=2.3  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 24MAR2020 17:11:19  37.6N  118.9W Md=2.3  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 24MAR2020 18:10:30  37.6N  118.9W Md=2.6  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 24MAR2020 17:29:44  37.6N  118.9W Md=2.8  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 24MAR2020 17:51:06  37.6N  118.9W Ml=2.2  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 24MAR2020 17:59:29  37.6N  118.9W Ml=2.3  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 24MAR2020 16:38:59  37.6N  118.9W Md=2.1  EMSC   LONG VALLEY AREA, CALIFORNIA 

P: 25MAR2020 122810    38.3N  119.3W 2.5-4.3 AAAAA  California/Nevada area     

 

MODERATE QUAKES IN CHILE

 

EARTHQUAKE SUMMARY FOR MARCH 23, 2020

 

It was an unremarkable day in global seismicity. The strongest earthquakes of the day occurred off the coast of Chile as an M 4.9 off Northern Chile in Tarapaca, an M 5.0 near Coquimbo and an M 5.1 off the coast of Aisen, Chile. The M 5.1 in the Aisen area is the strongeste since a similar M 5.1-5.2 on November 23, 2019. The last of significantly larger magnitude in this area was an M 5.5 on March 8, 2018. Forecast 122967 had expected today's activity was likely mid-March.

 

O: 23MAR2020 17:46:11  44.5S   79.1W mb=5.1  EMSC   OFF COAST OF AISEN, CHILE    

P: 17MAR2020 122725    43.0S   83.0W 4.0-5.4 CBCAA  Chile Rise                 

P: 27MAR2020 122967    43.0S   83.0W 4.0-5.3 BBCAA  Chile Rise                 

 

The event in Coquimbo, Chile is the strongest in that region since an M 6.1 on November 4, 2019 and is probably a regional aftershock of that event. A similar

M 4.9-5.0 hit near today's epicenter on February 23, 2020. Forecast 122963 had

GUC reported the earthquake in Coquimbo  was felt with intensity IV in  Coquimbo at Monte Patria, Ovalle, Punitaqui; III in Rio Hurtado, Paiguano and II in Canela, Combarbala, Coquimbo, La Serena, Chile.

 

O: 24MAR2020 06:52:14  30.5S   71.9W Mw=5.0  EMSC   OFFSHORE COQUIMBO, CHILE     

O: 24MAR2020 06:52     30.6S   71.5W mb=4.8  GUC    Arica at Codpa,Cuya, II in Ari

P: 19MAR2020 122720    30.0S   72.0W 4.0-5.4 BAAAA  Coast Central Chile        

P: 25MAR2020 122963    30.0S   71.0W 4.0-5.4 AAAAA  Coast Central Chile        

 

 

A moderate M 4.9 also occurred in northern Chile today in the Tarapaca area.

NEIC reported this earthquake of M 4.9 in northern Chile  was felt with intensity II-III in the area(s) of Chile at Arica and Iquique, Tarapaca.

GUC reported the earthquake in Tarapaca was felt with intensity IV in  Arica at Codpa,Cuya, II in Arica and III in Tarapaca at Alto Hospicio, Camina and Iquique, Chile. The mainshock was preceded by an M 4.7 foreshock to the southwest. This activity had been expected in forecast 122705 to occur around March 21 within about 100 km of today's epicenter.

 

O: 23MAR2020 22:13:00  19.0S   70.3W ML=4.7  EMSC   TARAPACA, CHILE              

O: 23MAR2020 22:16:45  18.9S   70.0W mb=4.9  EMSC   TARAPACA, CHILE               

O: 23MAR2020 22:16     18.9S   70.0W mb=4.6  GUC    Coquimbo at Monte Patria, Oval

P: 21MAR2020 122705    19.0S   69.0W 4.0-5.3 AAAAA  So. Peru/Bolivia           

 

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last earthquake of M>=4.9 within about 150 km of today's epicenter was an M 6.2 within about 25 km of today's epicenter. Today's M 4.9 appears to be the strongest aftershock to date of that event. Forecast 122669 had expected this activity was likely in mid-March.

 

O: 23MAR2020 12:25:54  51.9N  177.7W Mw=4.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 14MAR2020 122669    51.1N  179.1W 3.5-4.8 CAAAA  Andreanoff Isls, Aleutians 

 

 

MODERATE AFTERSHOCKS IN UTAH AND CALIFORNIA

 

EARTHQUAKE SUMMARY FOR MARCH 22, 2020

 

A pair of moderate earthquakes occurred in California today with an M 4.3 in the

Ridgecrest area where an M 7.1 occurred on July 6, 2019. The other was an M 4.8 off the coast of Northern California which has seen several events up to M 5.8 in the past several weeks. Aftershocks also continued in the area of Salt Lake City, Utah. The largest of these today was an M 3.9 which did minor additional damage to this area hit by an M 5.6 on March 18.

 

A moderate aftershock of M 4.3 occurred today in the Ridgecrest, California area. NEIC reported maximum intensity IV in Trona and II-III in Ridgecrest, Inyokern, California City, Pahrump, and Lake Hughes. The last aftershock in the Ridgecrest area of M>=4.3 occurred on August 23, 2019, seven months ago, of M 4.3. Today's event was considerably to the east of the normal aftershocks by about 30 km and may represent a region of accumulated stress where a larger event is waiting. Forecast 122622 had expected today's aftershock was likely around March 18.

 

O: 22MAR2020 21:08:21  35.6N  117.4W ml=2.5  ANSS   Searles Valley CA            

O: 23MAR2020 06:24:19  36.0N  117.4W ml=2.1  ANSS   Searles Valley CA            

O: 23MAR2020 05:53:57  36.0N  117.4W mw=4.3  ANSS   NNE of Searles Valley        

P: 18MAR2020 122622    35.6N  117.6W 2.5-4.3 BAAAA  So. California             

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 off the coast of northern California. NEIC reported this event was felt along the coast with intensity II-III in Ferndale, Petrolia, Loleta, Rio Dell, Fortuna, Hydesville, Samoa, Eureka and Carlotta, California. This is the second largest aftershock to the M 5.8 off Northern California occurred on March 18 - the largest was an M 5.2 on March 18. Forecast 122652 had expected today's activity was likely around March 20.

 

O: 22MAR2020 16:27:38  40.4N  124.8W mw=4.8  ANSS   47km WNW of Petrolia         

O: 22MAR2020 16:27:37  40.4N  124.8W Mw=4.8  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 20MAR2020 122652    40.5N  125.8W 2.5-4.3 AAAAA  Off Coast of No. Calif     

 

An aftershock of M 3.9 was also widely felt in the Salt Lake City, Utah area today. NEIC reported maximum shaking IV in Utah at Magna, Salt Lake City, and North Salt Lake City for this event. This is the strongest aftershock in Salt Lake City since the immediate shocks following the M 5.6 on March 18. Forecast 122631 had expected regional activity would continue around March 20.

 

O: 22MAR2020 08:57:14  40.7N  112.1W ml=2.1  ANSS   NE of Magna Utah

O: 22MAR2020 08:31:36  40.7N  112.1W ml=2.2  ANSS   NE of Magna Utah

O: 22MAR2020 15:50:15  40.8N  112.1W ml=2.8  ANSS   NNE of Magna Utah

O: 23MAR2020 01:17:15  40.8N  112.1W ml=3.9  ANSS   NNE of Magna Utah            

P: 20MAR2020 122631    39.7N  110.8W 2.0-4.0 BBAAA  Utah area                  

 

The strongest earthquakes in the world today were an M 6.1 in the Central East Pacific Rise and an M 5.6 in the Central Mid-Atlantic Ridge. Neither of these were reported felt in these remote areas. The event in the Central East Pacific Rise is the largest within about 250 km of that epicenter since an M 6.1 on September 11, 2013 and a similar M 6.1 on August 4, 2007. The maximum sized earthquakes in the region in the past 30 years have been about M 6.1.

 

O: 22MAR2020 22:38:05   4.7S  105.1W mw=6.1  ANSS   Central East Pacific Rise"   

 

The M 5.6 in the mid-Atlantic is the largest within about 250 km of that epicenter since an M 5.8 on July 23 and August 3, 2018 and prior to that an M 5.8 on March 29, 2014. None of these earthquakes were reported felt nor did any touch off a tsunami. Forecast 122540 had expected today's event was likely within about 100 km around March 6. This event occurred at the sixth node (60 degrees) from the M 7.7 south of Cuba of January 28 and may have been promoted from this source. An unusual aftershock of that event in the Cayman Islands also occurred today with M 4.6. It is the strongest aftershock in the Cayman Islands since the M 7.7 in late January.

 

O: 22MAR2020 20:43:07   0.7S   21.0W mw=5.6  ANSS   Central Mid-Atlantic Ridge"  

P: 16MAR2020 122540     1.0S   20.0W 4.0-5.4 CAAAA  Central Mid-Atlantic       

 

NEIC reported the earthquake of M 4.6 in the Cayman Islands  was felt with intensity II-III in the area(s) of the Cayman Islands on East End (IV) and Bodden Town, George Town and West Bay, Grand Cayman Islands. This event had been expected around March 21 within about 25 km in forecast 122558.

 

O: 22MAR2020 18:35:31  18.9N   80.8W mb=4.6  ANSS   East End Cayman Islands      

P: 21MAR2020 122558    19.0N   81.0W 3.5-5.0 AAAAA  Caribbean Sea              

 

Aftershocks in the region of Zagreb, Croatia also continued today following the M 5.4 there yesterday. These were light but were generally felt in the area of Zagreb if of M>=3. Forecasts 122634 and 122641 had expected activity in this area was likely around March 18-21.

 

O: 23MAR2020 02:00:30  45.9N   16.0E ML=3.0  EMSC   CROATIA

O: 22MAR2020 08:10:26  45.9N   16.0E ML=3.0  EMSC   CROATIA                      

O: 22MAR2020 08:04:01  45.9N   16.0E ML=3.1  EMSC   CROATIA                      

O: 22MAR2020 09:11:57  45.9N   16.1E ML=3.3  EMSC   CROATIA                      

P: 18MAR2020 122634    46.0N   13.0E 3.0-4.9 BABAA  Austria                    

P: 21MAR2020 122641    43.0N   15.0E 3.0-4.9 ACAAA  Italy                      

 

M 5.4 QUAKE IN CROATIA DEADLY

 

EARTHQUAKE SUMMARY FOR MARCH 21, 2020

 

A moderate earthquake of M 5.4 shook areas of Croatia today. It was damaging within about 50 km of the epicenter. Internet and news sources showed fallen columns and damaged buildings in the Zagreb region of Croatia. This is the strongest earthquake in Croatia in more than 140 years. At least one person was killed and many injured by falling debris. The death occurred to a boy during a roof collapse at Djordjiceva. Damage also occurred to the Croatian Parliament Building. Croatia was under a COVID-19 lockdown when the earthquake occurred and many injuries may have been prevented as people were in their homes at the time of the event. The Zagreb Cathedral Tower saw damage  when one of the spires was broken off. Similar damage occurred in 1880 when a damaging quake also hit Zagreb. Similar damage also occurred to the cathedral in Salt Lake City, Utah earlier this week when an M 5.7 shook that area.  Today's mainshock was felt with damaging intensity VII in Croatia in Zagreb at Kasina, Zagreb, Dubrava, Sesvete; VI in Bestovie, Selnica, Oroslavje, and V in Jablanovec, Andraseveckrapina-Zagorje and Zapresic. Similar intensity were reported with an M 4.6 aftershock. This activity follows an activation of the region which began with an M 5.6 in  Tirana, Albania on September 21, 2019 and an

M 5.3 on November 26, 2019 and continued with an M 5.7 in Greece yesterday.

Much of this activity is located at 102-104 degrees from Halmahera and the Molucca Sea where a series of major earthquakes has recently occurred. Still the main trigger appears to be stress redistribution from earlier regional earthquakes. At the time of the Albanian quake in November this summary noted:

 

 

"Today's epicenter in Albania is at 101-102 degrees from the M 7.1 in the Molucca Sea of November 14; at 104 degrees from the M 7.3 Halmahera quake of July 14, 2019 and 108 degrees from the Banda Sea (M 7.1) of June. Following strong earthquakes seismic energy is concentrated at this distance on the surface from the major quake by internal reflections and refractions off inner earth boundaries. This energy can help promote stronger than normal seismicity in this distance range, as appears to have occurred with today's event in Albania. This was emphasized in this summary on July 15, 2019 when an M 7.3 near Molucca in the Halmahera region (with the full moon) was followed by an M 4.9 south of Albania in northern Greece as:

 

"The enhanced seismicity in the region of Greece and the Anatolian Fault also continued today. This was probably spurred by the M 7.3 in Halmahera which is at 103 degrees from Greece when an M 4.9 occurred.  NEIC reported this earthquake of M 4.9 in Greece was felt with intensity IV in Kozani and Siatista; IV in Tetovo and I-III in the area(s) of Larisa, Bitola and Ohrid, Greece.  Today's epicenter is about 100 km southeast of a series of events of M 4.9-5.1 on June 1, 2019." (July 15, 2019)

 

The beginning of the series on June 1, 2019 occurred within a day of the new moon of June 3 and was likely promoted by tidal stresses as well. This summary also noted this at the time.

 

"... With the new moon today, tidal stresses were very high at this time and probably helped lead to the enhanced magnitude of the mainshock. The area near this epicenter became active earlier this year with an M 5.0 and 5.2 on June 1, 2019; and nearer today's epicenter an M 5.6 on September 21, 2019. Today's event of M 6.4 is the strongest in Albania in at least 30 years." (November 26, 2019)

 

Today's activity in Croatia, like the Albanian quake of November and September, 2019 is a day shy of the new moon and near the maximum stress longitude for this new moon and was probably promoted by tidal effects from that alignment as noted in previous issues of this report:

 

"The new moon will arrive on March 24, 2020 at 09:28 UT. Longitudes which are antisolar at this time are near 142 West and 38 East longitudes. These include areas of southern Alaska and western North America, Hawaii in the west and Turkey, Greece and eastern Mediterranean in the east. These areas may experience enhanced seismicity during the period March 21-28 with the possibility of a strong earthquake in the world with a component of tidal triggering. Tidal triggering can occur in many areas and other regions may also see promoted seismicity during this seven-day period." (March 21-22, 2020)

 

An earthquake of M>=5.4 last occurred within about 100 km of today's Croatian epicenter as an M 5.4 on February 14, 1963. Similar activity occurred as an M 5.6 on March 27, 1938; an M 5.4 on January 28-29, 1910; and strong quakes of M 6.3 and 6.0 in late 1905 and early 1906 and October 8, 1909. The last such event to occur in Zagreb, Croatia occurred with M 6.2 on November 9, 1880. That event was followed by a series of strong aftershocks through 1906. The last earthquake within about 50 km of Zagreb with M>=4.5 occurred on November 1, 2015 (M 4.5) and an M 4.7 on September 10, 1996. Forecasts 122421 and 122634 had expected today's activity was possible in mid-March.

 

O: 22MAR2020 05:24:02  45.9N   16.0E Mw=5.4  EMSC   CROATIA                      

O: 22MAR2020 06:01:20  45.9N   16.0E mb=5.0  EMSC   CROATIA                      

P: 10MAR2020 122421    46.0N   14.0E 3.0-4.9 DABAA  Austria                     

P: 18MAR2020 122634    46.0N   13.0E 3.0-4.9 AABAA  Austria                    

 

Another event which might have been promoted by the new moon was an M 5.0 in the

Comoros Islands east of Central Africa as it occurred near the longitude of maximum tidal stresses (see TIDAL section). NEIC reported this earthquake of M 5.0 in the Comoros Islands  was felt with intensity IV-IV in the area(s) of Mayotte at Mamoudzou and Pamanzi. In recent months the area of Mayotte to about 100 km southeast of this epicenter has been active but generally this has not extended as far as the Comoros region. An M 5.1 hit the Mayotte region last on January 2, 2020 and prior to that in May and June, 2018 after an M 5.8 shook the area on May 15, 2018. But today's event in the Comoros area is the first in that region of M>=5 since an M 5.2 on December 1, 1993. Today's activity is located at the seventh node (51-52 degrees) from the M 6.8 in Eastern Turkey of January 24 and may have been promoted by energy from that source.

 

O: 21MAR2020 06:42:34  12.4S   44.9E mb=5.0  EMSC   COMOROS REGION               

O: 21MAR2020 11:09:48  12.8S   45.4E ML=3.4  EMSC   MAYOTTE REGION               

P: 14MAR2020 122700    12.0S   44.0E 3.0-4.5 CAAAA  Mayotte                    

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in Hawaii.

NEIC reported this earthquake of M 3.3-3.8 in Hawaii  was felt with intensity II-III in the area(s) of Hawaii in Mountain View, Kurtistown and Hilo.

This follows a similar M 3.9 in Hawaii on March 19, 2020 and suggests reinvigoration of the volcanic activity in the area.  Forecast 122582 had expected today's event was likely around March 17.

 

O: 21MAR2020 15:07:01  19.3N  155.1W Ml=3.8  EMSC   ISLAND OF HAWAII, HAWAII     

P: 17MAR2020 122582    19.4N  155.1W 4.0-5.3 BAAAA  Hawaii area                

 

MODERATELY STRONG M 5.7 RATTLES GREECE

 

EARTHQUAKE SUMMARY FOR MARCH 20, 2020

 

The strongest earthquake in the world today was an M 5.7 in Greece. NEIC reported maximum intensity VII in Greece at Kanallakion; V in Igoumenitsa, Arahtos, and Preveza; IV in Tsillikopoulon, Kavos, and III in Paramithia, Thesprotia. A foreshock of M 4.6 was felt in Greece at Parga, Preveza; IV in Gouvia and II in Kerkira. Today's M 5.7 is the strongest in Greece within about 200 km of this epicenter since an M 6.5 on November 17, 2015 and prior to that an M 6.1 on February 3, 2014. Both of these occurred about 100 km south of today's epicenter. Forecasts 122592 and 122412 had expected a moderate quake in Greece in mid-March. This epicenter is at 102-104 degrees from the strong quakes in recent months in the area of Ceram and the Philippines and may have been promoted by energy from those sources.

 

O: 21MAR2020 00:49:51  39.3N   20.6E Mw=5.7  EMSC   GREECE                       

O: 20MAR2020 21:38:29  39.3N   20.6E mb=4.5  EMSC   GREECE                       

P: 14MAR2020 122592    39.0N   26.0E 3.0-4.6 CACAA  Aegean Sea                 

P: 11MAR2020 122412    36.0N   22.0E 3.0-4.3 CCCAA  No Greece                  

 

The strongest earthquake in the U.S. or Canada outside Alaska today occurred as an M 4.5 in north-western Nevada. NEIC reported it was felt with intensity V in Nevada at Minden and Carson City and IV in Glenbrook, Washoe Valley, Gardnerville, Dayton, and Incline Village. This may be part of the activation of the Mendocino fault zone inland between 39 and 41 North Latitude. This has recently include events of M 5.8 off Northern California, an M 5.7 in Salt Lake City, Utah and a number of M>=4 events in northern California. The last earthquake of M>=4.8 within about 100 km of today's epicenter in Nevada occurred on October 27, 2011 with M 4.9 and prior to that on April 26, 2008 with M 5.0. Forecast 122595 had expected today's event was likely within about 10 km of the epicenter around March 19. Today's epicenter is located at 101 degrees from the M 6.8 in Eastern Turkey of January 24, 2020 and may have been promoted by energy from that event.

 

O: 21MAR2020 01:33:35  39.1N  119.7W Mw=4.8  EMSC   NEVADA                       

O: 21MAR2020 01:39:36  39.1N  119.7W ml=2.0  EMSC   NEVADA

O: 21MAR2020 06:45:51  39.1N  119.7W ml=2.0  EMSC   NEVADA

O: 21MAR2020 05:44:49  39.7N  120.0W ML=2.1  EMSC   NORTHERN CALIFORNIA          

P: 19MAR2020 122595    39.1N  119.6W 2.5-4.4 AAAAA  California/Nevada area     

 

The largest quake in Alaska was an M 5.1 in the Gulf of Alaska. It was reported by NEIC to have been felt with weak intensity in Alaska at Kodiak, Homer, Seward, Anchorage and Chugiak. This is the largest aftershock in the Gulf of Alaska of the M 7.9 of January 23, 2018 since a similar M 5.1 on January 31, 2020. The last such event of larger magnitude was an M 5.5 on May 8, 2018. Forecast 122692 had expected a moderate quake in this aftershock zone was likely around March 16. This and an M 5.2 two hours later near the antipode in the South Indian Ocean may have been promoted by stresses associated with the upcoming new moon as noted in this summary:

 

"The new moon will arrive on March 24, 2020 at 09:28 UT. Longitudes which are antisolar at this time are near 142 West and 38 East longitudes. These include areas of southern Alaska and western North America, Hawaii in the west and Turkey, Greece and eastern Mediterranean and the area south of Africa in the east. These areas may experience enhanced seismicity during the period March 21-28 with the possibility of a strong earthquake in the world with a component of tidal triggering. Tidal triggering can occur in many areas and other regions may also see promoted seismicity during this seven-day period." (March 20-21, 2020)

 

O: 20MAR2020 07:53:26  56.5N  148.6W Mw=5.1  EMSC   GULF OF ALASKA               

P: 16MAR2020 122692    55.0N  150.0W 3.0-4.6 BAAAA  Gulf of  Alaska            

 

The earthquake in the Gulf of Alaska is nearly antipodal to an M 5.2 south of Africa that occurred two hours later. This is the largest quake within about 300 km of this epicenter since an M 5.5 on October 29, 2016. This epicenter is south of the antipode (at 56.5S 31.4E) but nearly exactly on the longitude (within about 10 km). Some effects from the Gulf of Alaska quake may have helped promote this antipodal event as well as tidal effects from the upcoming new moon. The area had expected to see moderate activity in early March in forecast 122522.

 

O: 20MAR2020 09:54:18  48.5S   31.3E mb=5.2  EMSC   SOUTH OF AFRICA              

P: 05MAR2020 122522    41.0N   43.0E 4.0-5.5 DDDAA  So. Indian Ocean           

 

"The M 6.3-6.6 earthquake south of Bali, Indonesia yesterday was as close as strong seismicity occurs to antipodal to the M 7.7 south of Cuba of January 28. It is likely, like the M 7.0 Kuril Islands event before it, and the M 6.3 in the Kermadec Islands to have been promoted by concentrated energy from that source." (March 19-20, 2020)

 

The exact antipode of the Bali quake is at 11N 64W in northern Venezuela.

NEIC reported an earthquake on March 16 of M 4.7 in Northern Venezuela within about 100 km of this epicenter was felt with intensity II-III in the area(s) of Chaguanas, Trinidad and Tobago.  More such activity in Trinidad and Tobago is possible following the M 6.3-6.6 in Bali.

 

The strongest aftershock in Bali today was an M 4.0. Forecast 122706 had expected this activity in mid-March.

 

O: 20MAR2020 22:26:06  10.6S  115.1E ML=4.0  EMSC   SOUTH OF BALI, INDONESIA     

O: 20MAR2020 14:27:51  10.7S  115.2E ML=3.2  EMSC   SOUTH OF BALI, INDONESIA     

P: 15MAR2020 122706    11.0S  115.0E 4.0-5.4 BAAAA  So. of Indonesia           

 

MODERATELY STRONG QUAKES SHAKE CHINA AND MONGOLIA

 

EARTHQUAKE SUMMARY FOR MARCH 19, 2020

 

Two moderately strong earthquakes today occurred in Asia. An M 5.7 in western Xizang, China was felt in Nepal while an M 5.8, the strongest in the world today occurred in Western Mongolia. There were no initial reports that this earthquake was felt, but given the size and location, some felt effects probably occurred.  No earthquakes of M>=5.8 have occurred within about 300 km of this epicenter in the past 30 years. An M 5.8 occurred about 350 km to the southeast of this on June 15, 2006. Forecast 122644 had expected today's event was likely about 100 km to the east of this epicenter in mid-March.

 

O: 20MAR2020 03:03:13  46.0N   94.0E mb=5.8  EMSC   WESTERN MONGOLIA              

O: 20MAR2020 03:55:08  46.2N   93.8E mb=4.1  EMSC   WESTERN MONGOLIA             

P: 12MAR2020 122644    46.0N   96.0E 4.0-5.3 CABAA  Mongolia                   

 

A moderately strong earthquake of M 5.7 occurred today in western Xizang, China north of Nepal. It was probably felt in the epicentral region with possible damage. NEIC reported intensity II-III in Nepal at Tribuvannagar, Kathmandu and Lalitpur. This is the strongest earthquake within about 250 km of this epicenter since an M 5.8 on December 23, 2018 and prior to that an M 7.3 and aftershocks on May 12, 2015. That major shock was about 200 km southwest of today's epicenter. Forecast 122584 had expected a moderate event within this area around March 16.

 

O: 20MAR2020 01:33:14  28.6N   87.3E Mw=5.7  EMSC   WESTERN XIZANG               

P: 16MAR2020 122584    27.0N   88.0E 3.5-5.3 BBAAA  Nepal                      

 

The M 6.3-6.6 earthquake south of Bali, Indonesia yesterday was as close as strong seismicity occurs to antipodal to the M 7.7 south of Cuba of January 28. It is likely, like the M 7.0 Kuril Islands event before it, and the M 6.3 in the Kermadec Islands to have been promoted by concentrated energy from that source.

Forecast 122706 had expected this activity within about 25 km was likely in mid-March.

 

O: 19MAR2020 08:15:43  10.9S  115.2E ML=3.4  EMSC   SOUTH OF BALI, INDONESIA     

O: 19MAR2020 07:06:18  11.0S  115.2E ML=3.6  EMSC   SOUTH OF BALI, INDONESIA     

P: 15MAR2020 122706    11.0S  115.0E 4.0-5.4 BAAAA  So. of Indonesia           

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in Hawaii.

NEIC reported this earthquake of M 3.9 in Hawaii  was felt with intensity II-III in the area(s) of Hawaii at Hilo (IV), Pahala, Naalehu, Captain Cook, Holualoa, Volcano, Kailua Kona, Papaikou, Pepeeleo and Kamuela. The last earthquake in Hawaii of M>=3.9 occurred on February 3, 2020 with M 4.2 and prior to that an M 4.9 on November 11, 2019. Forecast 122582 had expected today's event was likely in Hawaii within about 50 km of this epicenter around March 17.

 

O: 19MAR2020 16:54:52  19.2N  155.5W ML=3.9  EMSC   ISLAND OF HAWAII, HAWAII     

P: 17MAR2020 122582    19.4N  155.1W 4.0-5.3 AAAAA  Hawaii area                

 

The strongest earthquake in Alaska today was an M 3.8 in the Fox Islands, Alaska. NEIC reported this earthquake of M 3.8 in the Fox Islands, Alaska  was felt with intensity II-III in the area(s) of the Fox Islands, Alaska at Unalaska. The last earthquake in the Fox Islands of M>=3.8 occurred on 4.1 on March 15, 2020 and prior to that an M 3.8 on February 24, 2020. Forecast 122672 had expected today's event within about 25 km was likely around March 18.

 

O: 19MAR2020 19:48:25  53.6N  165.1W mb=3.8  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 18MAR2020 122672    53.7N  165.3W 3.5-4.8 AAAAA  Fox Islands, Aleutians     

 

Aftershocks continued in the region of Salt Lake City, Utah today. The largest was an M 3.2. Some of these were reported felt lightly but there was no additional damage reported. A smaller event in Utah near the northern border also occurred today. Forecast 122631 had expected activity in the area in mid-March.

 

O: 19MAR2020 09:12:29  40.7N  112.0W ML=2.2  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 19MAR2020 12:44:47  40.7N  112.0W Ml=3.2  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 19MAR2020 18:16:39  40.7N  112.1W ML=2.8  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 19MAR2020 12:33:15  40.7N  112.1W Ml=2.2  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 19MAR2020 13:52:26  40.8N  112.0W ML=2.9  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 19MAR2020 17:53:23  40.8N  112.1W Md=2.3  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 20MAR2020 05:02:02  40.8N  112.1W Ml=2.1  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 20MAR2020 04:20:46  40.8N  112.1W Ml=2.3  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 19MAR2020 13:58:57  40.8N  112.1W Ml=2.4  EMSC   WASATCH FRONT URBAN AREA, UTAH

P: 15MAR2020 122631    39.5N  111.9W 2.0-4.0 BBAAA  Utah area                  

 

MODERATELY STRONG EARTHQUAKE SHAKES SALT LAKE CITY, UTAH

 

EARTHQUAKE SUMMARY FOR MARCH 18, 2020

 

A moderately strong M 5.6-5.7 earthquake shook the Salt Lake City area of Utah today. It cut power to a large swatch of the city as well as the international airport. Work was suspended at many sites which included attempts to control the spread of the Corona Virus CORVID-19. The epicenter was about 16 km west of Salt Lake City in Magma, Utah. It damaged buildings throughout the region but no one was injured or killed according to early reports. At the Mormon Temple in Salt Lake City damage occurred to spires and figures. Internet pictures showed extensive damage to buildings with some collapses. The earthquake occurred at about 7 a.m. local time when rush hour often occurs. But many people were not on the roads, instead working at home due to restrictions on travel related to the Corona Virus Pandemic. Many schools were closed also because of the Virus. Most extensive damage occurred to downtown buildings but gas and chemical leaks occurred in Kennecott. NEIC reported maximum shaking VI (some damage) in Utah at Magna, Salt Lake City, North Salt Lake City; V in West Jordan, Herriman, IV in Centerville, Sandy, Farmington, Draper and other sites within about 50 km. Lesser shaking was reported in southwestern Montana, southern Idaho, Nevada, Wyoming, Colorado, and South Dakota. Reports of felt activity as far as more than 1000 km from the epicenter in Illinois, for example, were probably mistaken. The strongest aftershocks to date were of M 4.5 and  M 4.6  - events felt with intensity V in Magna, Salt Lake City, North Salt Lake City and West Jordan, Utah. One promotional factor for the quake at this time is its near-antipodal location with the only tropical cyclone currently active - TC Herold currently at 26S 70E (antipode 26N 110W).

 

The last earthquake within about 150 km of this epicenter in Utah with M>=3.9 was an M 3.9 on September 24, 2019. This summary had noted that event at the time as:

 

 

"The largest earthquake in the U.S. or Canada today was an M 4.1 in northern Utah. NEIC reported it was felt with intensity III in Utah at Garland, Tremonton, Plymouth, Fielding, Portage, Snowville, Collinston, Deweyville, and Honeyville. This is the strongest earthquake in northern Utah within about 250 km of this epicenter since an M 4.3 on January 26, 2018 and the strongest within about 100 km since November, 1992." (September 25, 2019)

 

An M 4.0 also hit in Utah near Milford on January 17 about 250 km to the southwest of today's epicenter. The only earthquake in Utah in the past 30 years of M>=5.6 occurred on September 2, 1992 in the Saint George area about 450 km to the southwest of today's event. This summary had described this event which followed several hours after an M 7.4 in Nicaragua which killed more than 180 and left 13,000 homeless in the quake and tsunami, in the History section as:

 

"Damage occurred at Cedar City and Hurricane to St. George. A large landslide was triggered and destroyed three homes at Springdale. Maximum intensity was V in the Glendale and Enterprise, UT area. Also felt in Arizona and southestern Nevada and as far away as Flagstaff, Arizona. Felt slightly in Las Vegas." (September 2, 2019)

 

Forecast 122631 had expected moderate seismicity within about 150 km of today's epicenter was likely between March 15 and 20.

 

O: 18MAR2020 13:09:31  40.8N  112.1W mw=5.7  ANSS   6km NNE of Magna, Utah

O: 18MAR2020 13:09:31  40.7N  112.1W Mw=5.6  EMSC   WASATCH FRONT URBAN AREA, UTAH

P: 15MAR2020 122631    39.5N  111.9W 2.0-4.0 BBAAA  Utah area                  

P: 20MAR2020 122631    39.7N  110.8W 2.0-4.0 AAAAA  Utah area                  

 

More than 70 aftershocks of M>=2 were recorded. A listing of these can be found under the "ROCKY MOUNTAIN" section in this report. Following is a list of events of M>=3 in the aftershock sequence today:

 

O: 19MAR2020 02:34:19  40.8N  112.1W Ml=3.0  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 19:12:23  40.8N  112.1W mb=4.3  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 19:07:30  40.8N  112.1W ML=3.4  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 18:30:44  40.8N  112.1W ML=3.1  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 17:16:49  40.8N  112.1W ML=3.3  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 14:57:41  40.8N  112.1W ML=3.5  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 14:07:53  40.8N  112.1W Ml=3.0  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 14:06:12  40.7N  112.1W ML=3.4  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 14:05:04  40.8N  112.1W Ml=3.4  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 14:02:12  40.8N  112.1W mb=4.4  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 13:48:01  40.7N  112.1W Ml=3.1  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 13:36:37  40.8N  112.1W ML=3.5  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 13:32:29  40.8N  112.1W Mw=3.9  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 13:31:17  40.8N  112.1W ML=3.2  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 13:29:55  40.7N  112.1W ML=3.1  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 13:23:19  40.8N  112.1W ML=3.6  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 13:22:01  40.8N  112.1W ML=3.7  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 13:18:28  40.7N  112.1W ML=3.3  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 13:16:38  40.8N  112.1W ML=3.3  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 13:18:28  40.7N  112.1W ML=3.3  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 13:16:38  40.8N  112.1W ML=3.3  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 13:14:21  40.8N  112.1W ML=3.0  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 18MAR2020 13:09:31  40.7N  112.1W Mw=5.6  EMSC   WASATCH FRONT URBAN AREA, UTAH

P: 15MAR2020 122631    39.5N  111.9W 2.0-4.0 BBAAA  Utah area                  

P: 20MAR2020 122631    39.7N  110.8W 2.0-4.0 AAAAA  Utah area                  

 

A moderate earthquake was also felt in Northern California today. This event of M 5.0-5.2 occurred near the coast and was felt with maximum intensity VI in Ferndale and Scotia according to data from NEIC. Intensity V shaking occurred in California at Rio Dell, Fortuna and Eureka and IV in Petrolia and Hydesville with lesser shaking in Lleta, Carlotta and Myers Flat. Light shaking was reported as far as Central California and southern Oregon. Several light aftershocks followed.  This is probably a regional aftershock of the M 5.8 which hit the area to the west on March 9, 2020 in a regional activation from Alaska to southern California. This summary had noted this at the time as:

 

 

"The strongest earthquake in the world today was an M 5.8 off the Coast of Northern California. NEIC reported it was felt along the coast with maximum intensity at Ferndale, Petrolia, Loleta, Rio Dell, Fortuna, Hydesville, and Scotia and III in Samoa, Eureka. A moderate aftershock of M 4.9-5.0 off the coast of California was reported by NEIC to have been felt with intensity II-III along the coast of Northern California at Ferndale, Petrolia, Loleta, Rio Dell, Fortuna, Samoa, Hydesville, Eureka and Scotia. Several smaller aftershocks of M 2.9 and 2.5 were also lightly felt along the coast. This appears to be the culminating event in the regional activation which began in Alaska several days ago and was alluded to in this summary in previous issues as:

 

"The activation of Alaska and the northwest North American Plate at this time is reminiscent of the activation of early July, 2019 which culminated in the M 7.1 Ridgecrest, California event of July 6, 2019." (March 2, 10, 2020)

 

Forecast 122651 had expected today's event within about 25 km of the epicenter was likely around March 17.

 

It is interesting that the latitude of  the M 5.0-5.2 in Northern California and that of the Salt Lake City are nearly the same, continuing a pattern of strong enhancement along the Mendocino Fault line and inland as alluded to in this summary on March 4:

 

"An M 3.6 also occurred today in the region of Northern California northwest of the Geysers. NEIC reported this earthquake of M 3.6 in Northern California  was felt with intensity IV in the area(s) of Northern California at Redwood City, Potter Valley and II-III in Ukiah, Upper Lake, Willits, Comptche, Antelope. A foreshock of M 2.6 was felt with intensity III in Redwood City, Ukiah and Willits.  This may be related to recent enhanced activity in the Geysers or with the extension of the Mendocino Fault Zone inland." (March 4, 2020)

 

O: 18MAR2020 22:08:20  40.3N  124.4W Mw=5.2  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 18MAR2020 23:17:47  40.4N  124.6W Md=2.3  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 19MAR2020 02:51:12  40.4N  124.8W ML=2.6  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 19MAR2020 00:36:05  40.3N  124.4W Md=2.0  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 17MAR2020 122651    40.2N  124.2W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

The strongest earthquake in the world today was an M 6.3-6.6 in the area south of Bali, Indonesia. NEIC reported maximum intensity VI in Singaraja, Bali and IV in Ubud, Bali. Intensity II-III was felt in Bali at Kuta, Denpasar, Tabanan, Klungkung, Karangasem, and in Java at Banyuwangi, Jenber and Gondanglegi.

BMG reported this earthquake was felt with intensity IV in Lombok, Tengah, Lombok Timur, and Lombok Barat and  Denpasar and III in Sumbawa Barat, Kab. Sumbawa, Bima, Dompu and Lombok Utara, Indonesia. The timing of this event may have been promoted by stresses from Tropical Cyclone 21S which passed over this epicenter earlier in the week. It was expected to have an effect by enhancing regional seismicity as noted in this summary at the time:

 

"Tropical cyclone formed today  south of Java and Bali with winds up to 45 kts. This system is currently located at 16S 117E with winds up to 33 kts and moving to the SSE at 11 kts. Some seismic enhancement may be seen in the region from Java, Bali and Sumbawa, Indonesia an possibly in the Leeward Islands at the antipode (14N 63W)." (March 12-14, 2020).

 

At M 6.6 this event south of Java is the strongest in the world since the M 7.0 on February 13, 2020 in the Kuril Islands. An M 6.3 also occurred three days ago in the Kermadec Islands of New Zealand. It is the largest in the Bali area within about 300 km of this epicenter since an M 6.9 north of this on August 5 and again on August 19, 2018, the strongest regional activity since an M 6.6 on September 28, 1998. An M 7.8 event about 300 km to the west occurred on June 2, 1994. Forecast 122706 had expected today's event was likely within about 15 km of the epicenter around March 15.

 

O: 18MAR2020 22:51:50  10.5S  115.2E ML=4.5  EMSC   SOUTH OF BALI, INDONESIA     

O: 18MAR2020 17:45:38  11.1S  115.1E mw=6.2  ANSS   S of Kangin Indonesia

O: 18MAR2020 17:45:38  11.0S  115.1E Mw=6.3  EMSC   SOUTH OF BALI, INDONESIA     

O: 18MAR2020 17:45:37  11.2S  115.1E Mw=6.6  BMKG   SOUTH OF BALI, INDONESIA     

P: 15MAR2020 122706    11.0S  115.0E 4.0-5.4 BAAAA  So. of Indonesia           

 

The strongest earthquake in Alaska today was an M 4.8-5.0 in Northern Alaska.

This event is part of an aftershock sequence following the mainshocks of M 5.2 on March 6 and October 18, 2019. Forecasts 122692 had expected today's aftershock was likely around March 18.

 

O: 18MAR2020 15:50:46  66.3N  157.2W ML=3.1  EMSC   NORTHERN ALASKA

O: 18MAR2020 15:31:34  66.3N  157.2W Mw=4.8  EMSC   NORTHERN ALASKA

O: 18MAR2020 15:31:33  66.3N  157.1W ml=5.0  ANSS   Northern Alaska

O: 18MAR2020 15:37:44  66.3N  156.9W ml=3.6  EMSC   NORTHERN ALASKA              

P: 18MAR2020 122692    65.0N  156.0W 3.0-4.6 AAAAA  Northern Alaska            

 

STRONG ACTIVITY IN SOUTHWEST PACIFIC REIGNITES GLOBAL SEISMICITY

 

EARTHQUAKE SUMMARY FOR MARCH 17, 2020

 

A report of an M 5.6 in the Wasatch Range, Utah arrived as this report was going to press. Some damage in the area of Central and Northern Utah was reported. A strong sequence of aftershocks is continuing at this time. More on this earthquake will be available in the next issue of this summary. Forecasts 122631 and 122665 had expected moderate activity in this area as noted in the previous issue when an M 2.0 occurred in southern Idaho. In a curious coincidence the hourly timing of today's M 5.6 was within a minute of the regional foreshock on March 15. Today's mainshock appears to be at the fourth node (90 degrees) from the M 6.3 in Kermadec Islands, New Zealand two days ago and may have been promoted by energy from that source and other later earthquakes on the New Zealand arc.

 

O: 18MAR2020 13:09:31  40.7N  112.0W ml=5.6  EMSC   WASATCH FRONT URBAN AREA, UTAH

O: 15MAR2020 13:08:47  42.5N  111.4W ml=2.0  ANSS   NNW of Montpelier Idaho      

P: 20MAR2020 122631    39.7N  110.8W 2.0-4.0 BAAAA  Utah area                  

P: 21MAR2020 122665    43.0N  111.5W 2.0-3.8 CAAAA  Yellowstone/Wyoming        

 

Strong earthquakes hit three areas of the Southwest Pacific today. The strongest was an unfelt event in near Vanuatu with M 6.1. An M 5.8-6.0 was also felt in Samoa. NEIC reported it was felt with intensity III in Samoa at American Samoa, Apia and Talimatau. An M 5.5 which was not reported felt also occurred in the Santa Cruz Islands northwest of Vanuatu. This may be due to residual stresses from the passage of Tropical Cyclone Gretel through the region several days ago as noted in previous issues of this report:

 

"A series of moderate events has been occurring in the western Kermadec Islands over the past several days. This may be related to stresses associated with Tropical Cyclone Gretel which is currently passing through the area. This summary had noted this as a potential seismic trigger as:

 

"Tropical cyclone Gretel formed today in the area east of Vanuatu and the Loyalty Islands with winds up to 65 kts. It is expected to pass west of the Loyalty Islands March 15-16 and then into the Kermadec Islands of northern New Zealand. Seismic enhancement is likely the Vanuatu, the Loyalty Islands and the Kermadec Islands in the next four days, including the possibility of a strong regional event in this time period." (March 13-14, 2020)

 

The last event in the northern Vanuatu Islands within about 250 km of today's

epicenter with M>=6.1 occurred more than a year ago on January 15, 2019 with M 6.6 and prior to that an M 6.8 on May 9, 2017. Forecast 122709 had expected the activity in Vanuatu within this range was likely in mid-March.

 

Most of this activity is occurring at 144-146 degrees from the M 6.8 in eastern Turkey of January 24 and was probably promoted by energy from that event.

 

O: 18MAR2020 03:13:46  13.1S  167.1E Mw=6.1  EMSC   VANUATU                      

P: 14MAR2020 122709    15.0S  168.0E 4.0-5.3 BBAAA  Vanuatu Islands            

 

An earthquake of M 5.1 hit the Santa Cruz Islands on March 15 but last of M>=5.5 within about 200 km of today's epicenter was an M 5.9 on January 13, 2018.  Forecast 122709 had expected today's event within about 50 km around March 21.

 

O: 18MAR2020 05:31:35  11.0S  164.4E Mw=5.5  EMSC   SANTA CRUZ ISLANDS REGION    

P: 21MAR2020 122709    11.0S  164.0E 4.0-5.3 BAAAA  Vanuatu Islands            

 

The earthquake of M 5.8-6.0 in Samoa is the strongest within about 200 km of that epicenter since an M 6.0 on November 20, 2017. The last with M>=6 in the region was an M 6.1 on October 26, 2016. Forecast 122702 had expected today's event in this region was likely around March 17.

 

O: 17MAR2020 16:06:22  16.1S  172.2W Mw=5.8  EMSC   SAMOA ISLANDS REGION         

O: 17MAR2020 16:06:22  16.0S  172.1W Mw=6.0  ANSS   SAMOA ISLANDS REGION         

P: 17MAR2020 122702    15.0S  174.0W 4.0-5.3 ABBAA  Samoa Islands              

 

The strongly enhanced seismicity in New Zealand of the past several days reported by this summary culminated today with an M 4.7 which was widely felt in southeastern South Island, New Zealand. GEONET reported it was felt widely in southeastern South Island, New Zealand. 31 people reported feeling this event. Felt with weak intensity by 18; and with light intensity by 13. This is a highly unusual event - most activity in the region occurs well to the west of this in the Te Anau region. The last earthquake within about 150 km of today's epicenter with M>=4.7 occurred more than 30 years ago. The last of M>=4 was an M 4.1 on July 1, 2017. Forecast 122729 had expected activity in the area to the northwest was likely around March 12.  This activity  occurred at 143 degrees from the M 6.8 in eastern Turkey of January 24 and was probably promoted by energy from that event.

 

 

O: 17MAR2020 12:19:32  47.2S  169.6E ML=4.7  GEONET Felt widely in southeastern South Island, New Zealand.

O: 17MAR2020 12:19:32  47.2S  169.6E ML=4.7  EMSC   OFF E. COAST OF S. ISLAND, N.Z

P: 12MAR2020 122729    45.0S  167.0E 3.0-4.8 BCBAA  So. Island, N.Z.           

 

This follows activity throughout New Zealand which followed the unusual M 6.3 in  the Kermadec Islands as reported in the previous issue of this summary:

 

 

"Three moderate earthquakes occurred today in the region from northern to South

Island New Zealand. This activity is probably related to stress redistribution following the M 6.3 in northern New Zealand in the Kermadec Islands yesterday. Today's events occurred as an M 4.8-5.0 off the east coast of North Island; an M 4.6-5.1 in northern South Island and an M 4.5 under North Island. These are at 144-145 degrees from the M 6.8 in eastern Turkey of January 24, 2020 and may have been promoted from this source. It is also at the fourth node (90 degrees) from the M 7.0 in the Kuril Islands of February 13 and was likely promoted from that source as well.' (March 16, 2020)

 

A moderately strong M 5.6 also occurred today in Central Chile. It was felt with moderate intensity V in Bio Bio Chile at Coronel, Tome, Talcahuano, and IV in Penco, Concepcion, Cauquenes, Chiguayante and Chillan and III in Bulnes and San Carlos, Chile. GUC reported this earthquake was felt with intensity  VI in  BioBio at Chiguayante, Concepcion, Talcahuano and Tome; V in Coronel, Los Angeles, Lota, San Pedro de la Paz; V in La Araucania at  Renaico and Angol; IV in Saavedra, Temuco and Tolten, Padre las Casas and III in Carahue, Collipulli, Curacautin and Los Sauces, Traiguen, Teodoro Schmidt,  in Nuble with V in Chillan, Cobquecura, El Carmen, Quirihue, Trehuaco and Yungay and VII in Coelemu; with VI in Maule at Pelluhue, Rauco; V in Constitucion, Linares; IV in Llico, Cauquenes, III in Iloca, Talca; in O'Higgins with II in Nancagua, San Fernando, Santa Cruz; at Cartagena, Valparaiso with III; and II in Illapel, Coquimbo, Chile. This is the strongest earthquake in the Bio-Bio region within about 200 km of this epicenter since an M 6.8 on September 29, 2019 and a similar M 6.8 on August 1, 2019 - both about 200 km north of today's epicenter.

Forecast 122719 had expected today's event to the sourh was likely around March 14. This epicenter is located at 147 degrees from the M 7.0 in the Kuril Islands of February 13, 2020 and was probably promoted by energy from that source.

 

O: 17MAR2020 08:12     36.2S   73.3W mb=5.6  GUC    BioBio at Chiguayante, Concepc

O: 17MAR2020 08:12:02  36.2S   73.1W Mw=5.6  EMSC   OFFSHORE BIO-BIO, CHILE      

P: 14MAR2020 122719    38.0S   74.0W 4.0-5.4 BBAAA  Central Chile              

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in Southern Alaska near Kodiak Island.  NEIC reported this earthquake of M 3.6-4.0 in the area of Kodiak, Alaska  was felt with intensity II-III in the area(s) of Alaska at Homer. This is the largest earthquake within about 100 km of this epicenter to occur near Kodiak Island since an M 4.0 on December 19, 2019 and an M 4.5 on December 1, 2019. Forecast 122688 had expected this activity to the north around March 19.

 

O: 17MAR2020 16:17:33  58.1N  153.7W ml=3.0  EMSC   KODIAK ISLAND REGION, ALASKA 

O: 17MAR2020 09:52:39  58.1N  154.2W mb=3.1  EMSC   ALASKA PENINSULA             

O: 17MAR2020 14:30:25  58.2N  152.5W mb=4.0  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 19MAR2020 122688    60.2N  153.2W 3.2-4.8 ABAAA  Central Alaska             

 

QUIET DAY IN SEISMICITY

 

EARTHQUAKE SUMMARY FOR MARCH 16, 2020

 

Seismicity around the world today was at quiet levels. The strongest events of the day occurred in the antipodal areas of Indonesia - with an M 5.0 in the Celebes and an M 5.0 in the New Britain region. Neither was reported felt.   These are not unusual events for the region but are generally antipodal to the M 4.8 on the Colombia-Brazil border yesterday, the strongest in that region in the past 30 years at least. This summary had noted this in the previous issue as:

 

 

"An unusual earthquake of M 4.7 occurred along the border of Colombia and Brazil today. It was not reported felt in this region of the Amazon. This is the strongest earthquake within about 300 km of this epicenter in at least 30 years.

This epicenter is located at 103 degrees from the M 6.8 in Eastern Turkey of January 24 and was probably promoted by energy from that event. Earthquake activity often increases at 103 degrees from large earthquakes in the weeks following. This is probably related to energy concentration at this distance following internal earth reflections." (March 15-26, 2020)

 

The antipode of this earthquake is at 1S 110E near Java, a region which may see enhanced seismicity in the next several days.

 

O: 15MAR2020 18:33:39   0.6N   69.0W mb=4.7  EMSC   COLOMBIA-BRAZIL BORDER REGION

 

O: 16MAR2020 15:09:15   6.2S  151.4E mb=5.0  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 14MAR2020 122547     5.0S  150.0E 4.0-5.4 ABBAA  New Ireland                

P: 20MAR2020 122547     5.0S  151.0E 4.0-5.4 BBAAA  New Ireland                

 

O: 16MAR2020 10:59:13   1.2S  126.5E mb=5.0  EMSC   KEPULAUAN SULA, INDONESIA    

P: 14MAR2020 122537     1.0N  126.0E 4.0-5.5 ACAAA  Mindanao, Philippines      

 

The strongest earthquake recorded in the U.S. or Canada today was an M 3.8 in Southern Alaska. This is the strongest earthquake within about 100 km of this epicenter since an M 4.2 on February 3, 2020 and prior to that an M 4.0 on December 19, 2019 - part of a grouping from December 17-19 in the area. Forecast 122688 had expected today's event was likely around March 19.

 

O: 16MAR2020 19:46:50  59.4N  152.9W ML=3.3  EMSC   SOUTHERN ALASKA              

O: 16MAR2020 08:19:54  59.7N  153.4W ML=3.8  EMSC   SOUTHERN ALASKA               

P: 19MAR2020 122688    60.2N  153.2W 3.2-4.8 BAAAA  Central Alaska             

 

Unusual seismicity continued in Southern Italy today. This follows similar event of M 4.3 in the region of the Tyrrhenian Sea yesterday. A larger M 4.8 hit near today's epicenter on February 24, 2020 and as an M 4.3 on January 16, 2020, the largest such events in the past half year.

 

"An M 4.6-4.8 quake was felt today in the region of Southern Italy. NEIC  reported maximum intensity VII in Rende, Calabria and VI in Cosenza and Milazzo, Sicily and possibly in Bologna, more than 600 km north of the epicenter. The M 4.8 was preceded by an M 3.4 to the west of it about 6 minutes before. This is the strongest earthquake in southern Italy within about 100 km of this epicenter since an M 4.9 on April 5, 2014. The last of M>=4.6 was an M 4.6 on October 25, 2019 to the east of today's epicenter" (February 24-25, 2020)

 

Forecast 122607 had expected regional activity near this epicenter was likely around March 15.

 

O: 15MAR2020 11:29:05  39.7N   13.2E mb=4.3  EMSC   TYRRHENIAN SEA               

P: 15MAR2020 122607    38.0N   14.0E 3.0-4.4 ABAAA  Mediterranean/Sicily       

 

O: 17MAR2020 00:55:51  39.1N   15.9E ML=3.4  EMSC   SOUTHERN ITALY

O: 17MAR2020 01:02:43  39.1N   15.9E ML=3.6  EMSC   SOUTHERN ITALY

O: 17MAR2020 00:52:56  39.0N   16.1E ML=3.9  EMSC   SOUTHERN ITALY               

P: 13MAR2020 122607    38.0N   15.0E 3.0-4.5 BAAAA  Mediterranean/Sicily       

P: 15MAR2020 122607    38.0N   14.0E 3.0-4.4 AABAA  Mediterranean/Sicily       

 

NEW ZEALAND CONTINUES TO SHAKE FOLLOWING M 6.3 IN KERMADEC ISLANDS

 

EARTHQUAKE SUMMARY FOR MARCH 15, 2020

 

Three moderate earthquakes occurred today in the region from northern to South

Island New Zealand. This activity is probably related to stress redistribution following the M 6.3 in northern New Zealand in the Kermadec Islands yesterday. Today's events occurred as an M 4.8-5.0 off the east coast of North Island; an M 4.6-5.1 in northern South Island and an M 4.5 under North Island. These are at 144-145 degrees from the M 6.8 in eastern Turkey of January 24, 2020 and may have been promoted from this source. It is also at the fourth node (90 degrees) from the M 7.0 in the Kuril Islands of February 13 and was likely promoted from that source as well.

 

GEONET reported the earthquake off the east coast of North Island, New Zealand was felt by 229 people with weak intensity by 90 and light intensity by 124 persons and moderate intensity by 15. NEIC reported this earthquake of M 4.8 near the coast of North Island, New Zealand   was felt with intensity II-III in the area(s) of the coast of North Island, New Zealand at Whakatane, Bay of Plenty. The last earthquake within about 200 km of this epicenter with M>=5.0 was an M 5.2 on February 4, 2020. These may be aftershocks of an M 5.8 on November 23, 2019, an event which preceded the volcanic eruption on White Island that killed many several days later.  Forecast 122722 had expected today's event in this area was likely around March 12.

 

O: 15MAR2020 14:22:35  38.0S  177.6E Mw=4.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 15MAR2020 14:22:37  37.6S  177.5E ML=5.0  GEONET reported felt by 229 people

P: 12MAR2020 122722    39.0S  176.0E 3.0-4.3 BAAAA  North Island, N.Z.         

 

GEONET reported the earthquake in South Island, New Zealand was felt with moderate intensity in the area of northern South Island, New Zealand. 679 people reported feeling this earthquake including 302 with weak intensity; 256 with light intensity; 109 with moderate shaking 9 with strong; 0 with severe and  3 with extreme intensity. There were no immediate reports of damage or casualties.  NEIC reported this earthquake of M 4.6 in South Island, New Zealand  was felt with intensity II-III in the area(s) of South Island, New Zealand at Amberley, Canterbury.  This is the strongest earthquake in the Canterbury area of South Island within about 200 km of this epicenter since an M 5.4 on January 5, 2017 and prior to that an M 5.2 on December 29, 2016. Forecasts 122521 and 122728 had expected today's event was likely in mid-March within about 100 km of this epicenter.

 

O: 15MAR2020 15:28:58  42.7S  172.8E mb=4.6  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 15MAR2020 15:28:58  42.7S  172.8E MS=5.1  GEONET Felt with moderate intensity

P:  7MAR2020 122521    42.0S  173.0E 3.0-4.8 CAAAA  So. Island, N.Z.           

P: 21MAR2020 122728    42.0S  173.0E 3.0-4.8 CAAAA  So. Island, N.Z.           

 

The earthquake under North Island of New Zealand of M 4.5 was not reported felt by GEONET. NEIC reported this earthquake of M 4.5 in  North Island, New Zealand was felt with intensity II-III in the area(s) of North Island, New Zealand at Inglewood and Kapiti, Wellington. The last earthquake in North Island within about 100 km of this epicenter occurred January 25,, 2020 with M 5.1 and as an M 4.5 on September 11, 2019. Forecast 122726 had expected today's epicenter would likely be active within about 50 km around March 16.

 

O: 15MAR2020 22:57:04  39.7S  174.2E mb=4.5  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 16MAR2020 122726    40.0S  174.0E 3.0-4.3 AAAAA  North Island, N.Z.         

 

 

The strongest earthquake in the world today was an M 5.3-5.4 in Southern Iran near Bandar 'Abbas. NEIC reported it was felt with intensity III in the United Arab Emirates and I in Iran. Similar events of M 5.4-5.5 occurred last on February 16, 2020 and October 21, 2019 and July 22, 2018. The last earthquake within about 200 km of today's epicenter with significantly greater magnitude was an M 6.1 on May 11, 2013, an event which was followed a a series of aftershocks of M 5.4-5.6 in the following seven days. Forecast 122588 had expected today's activity in this area was likely around March 17.

 

O: 15MAR2020 22:04:26  27.4N   55.4E mb=5.4  EMSC   SOUTHERN IRAN                

P: 17MAR2020 122588    28.0N   57.0E 3.5-4.8 AAAAA  So. Iran/Persian Gulf      

 

An unusual earthquake of M 4.7 occurred along the border of Colombia and Brazil today. It was not reported felt in this region of the Amazon. This is the strongest earthquake within about 300 km of this epicenter in at least 30 years.

This epicenter is located at 103 degrees from the M 6.8 in Eastern Turkey of January 24 and was probably promoted by energy from that event. Earthquake activity often increases at 103 degrees from large earthquakes in the weeks following. This is probably related to energy concentration at this distance following internal earth reflections.

 

O: 15MAR2020 18:33:39   0.6N   69.0W mb=4.7  EMSC   COLOMBIA-BRAZIL BORDER REGION

 

The strongest activity in the U.S., Canada or nearby environs occurred in Baja California near the border with Southern California as events of M 3.3 and 3.4.

NEIC reported these earthquakes of M 3.4 in Southern California were felt with intensity II-III in the area(s) of Southern California at Ocotillo.  The last activity within about 100 km of this epicenter with M>=3.4 occurred January 29, 2020. Forecast 122617 had expected this activity around March 16 in  this area.  This epicenter is located at 103 degrees from the M 6.8 in Eastern Turkey of January 24 and was probably promoted by energy from that event.

 

O: 15MAR2020 10:34:06  31.6N  116.0W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO

O: 15MAR2020 12:38:55  31.7N  115.9W Ml=2.9  EMSC   BAJA CALIFORNIA, MEXICO

O: 15MAR2020 22:53:26  31.9N  116.1W Ml=2.4  EMSC   BAJA CALIFORNIA, MEXICO

O: 15MAR2020 10:46:17  31.6N  115.9W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO      

P: 16MAR2020 122617    32.0N  115.4W 2.5-4.3 AAAAA  So. California             

 

M 6.3 IN KERMADEC ISLANDS, NEW ZEALAND BREAKS SEISMIC LULL

 

EARTHQUAKE SUMMARY FOR MARCH 14, 2020

 

The global seismic chill of the past several weeks ended today with M 6.3 in northern Kermadec Islands, New Zealand. GEONET reported it was felt in Gisborne, New Zealand, but this is under review and this may be a ghost event (misidentified teleseismic event as a local quake). As it is the weekend, manual adjustments may not be made until the work week continues. In addition EMSC where the two abnormal events are listed is in the midst of a regional lockdown. The center is located in a hotspot of the outbreak of the Corona Virus and may not be fully manned to do manual checks of earthquakes at this time. ANSS is reporting only the mainshock of M 6.3 and this is probably the only event that occurred. It may, however indicate that further moderate earthquakes in New Zealand are likely in the next several days. This is the strongest earthquake within about 200 km of this epicenter since an M 6.3 on July 13, 2016. The last of larger magnitude was an M 7.4 on October 21, 2011. It is also the strongest earthquake in the world since an M 7.0 in the Kuril Islands on February 13, 2020 and prior to that the M 7.7 south of Cuba of January 28, 2020. This epicenter is at 104 degrees from the M 7.7 south of Cuba of January 28, 2020. Seismic energy concentrates at the surface following large events at this distance and can often enhance regional seismicity in this distance range. The M 7.0 on February 13, 2020 was also at 103-104 degrees from the Cuba mainshock.  This may be the first in a volley of moderately large to large earthquakes in the next several days. This summary had noted in previous issues that this was likely at this time as:

 

"The dampening effect of the full moon on global seismicity is coming to an end. As noted in previous issues of this report, a strong earthquake is likely in the next day or two – most likely in the Southwest Pacific which has been active in recent days." (March 12-13, 2020)

 

and

 

"There were some indications that this effect is reducing and that some enhancement of seismicity, including the possibility of a large quake is likely in the next several days. This included a gradual increase in maximum magnitude in some regions such as the Southwest Pacific." (March 11, 2020)

 

and

 

"A series of moderate events has been occurring in the western Kermadec Islands over the past several days. This may be related to stresses associated with Tropical Cyclone Gretel which is currently passing through the area. This summary had noted this as a potential seismic trigger as:

 

"Tropical cyclone Gretel formed today in the area east of Vanuatu and the Loyalty Islands with winds up to 65 kts. It is expected to pass west of the Loyalty Islands March 15-16 and then into the Kermadec Islands of northern New Zealand. Seismic enhancement is likely the Vanuatu, the Loyalty Islands and the Kermadec Islands in the next four days, including the possibility of a strong regional event in this time period." (March 13-14, 2020)

 

"The full moon will arrive at 17:48 on March 9, 2020. Longitudes which are sub-solar at this time are near 86 West and 94 East. These include Central and western South America and central U.S. in the west and eastern Indonesia and southeastern Asia in the east. Some tidal triggering is possible in these regions in the next week. Tidal triggering is also possible in other areas during this time. This is the second straight super-moon which occurs when the moon and earth are near their closest approach. The last such in February coincided with a period of extreme quiet in global seismicity as the sun and moon were on opposite sides and effectively balancing their tidal effects. Any expected quiet associated with this full moon could be ended with a major quake 4-6 days after as occurred with the Kuril Islands, M 7.0 of February 13, 2020." (March 4-11, 2020)

 

Forecast 122718 had expected today's M 6.3 was likely in the southern Tonga Islands within about 50 km of today's epicenter around March 16. In addition to being at 104 degrees from the M 7.7 south of Cuba of January 28, 2020, this event is at 148 degrees from the M 6.8 in Eastern Turkey of January 24, 2020 and may have been promoted from that source.

 

O: 14MAR2020 10:01:16  27.6S  175.6W Mw=6.3  EMSC   KERMADEC ISLANDS REGION      

O: 14MAR2020 10:01:17  27.4S  175.7W mw=6.3  ANSS   Raoul Island New Zealand

P: 16MAR2020 122718    27.0S  176.0W 4.0-5.4 AAAAA  Tonga Islands              

 

The two events listed by EMSC, but not by ANSS in the New Zealand area following the M 6.3 in the Kermadec Islands follow:

 

O: 14MAR2020 10:03:49  37.9S  178.1E ML=4.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 14MAR2020 10:06:08  40.2S  176.6E ML=4.3  EMSC   NORTH ISLAND OF NEW ZEALAND  

 

The largest earthquake in the U.S. or Canada today was an M 3.5 in the Fox Islands, Aleutians, Alaska. It was not reported felt. An M 3.7 occurred west of this in the Fox Islands on March 13 and the area is active. Forecast 122672 had expected this event was likely around March 18 within about 25 km of today's epicenter.

 

O: 15MAR2020 03:37:10  53.5N  165.3W ml=3.5  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 18MAR2020 122672    53.7N  165.3W 3.5-4.8 BAAAA  Fox Islands, Aleutians     

 

UNUSUAL M 4.0 IN WESTERN NEVADA

 

EARTHQUAKE SUMMARY FOR MARCH 13, 2020

 

An unusual  earthquake occurred today as an M 4.0 on the California-Nevada border near Goldfield. NEIC reported it was felt with intensity II-III in Nevada at Silverpeak, Pahrump. Henderson, and in California at Bishop, El Dorado Hills, Colfax. This is the strongest earthquake within this region of Nevada within about 100 km of this epicenter since an M 4.8 on February 14, 2015 and prior to that an M 4.0 ten years ago on October 5, 2010. These events occurred about 100 km southeast of today's epicenter. Forecast 122594 had expected the region would be active around March 12 in this radius.

 

O: 13MAR2020 23:54:31  37.5N  117.8W ml=2.2  EMSC   NEVADA                       

O: 13MAR2020 23:40:45  37.5N  117.7W ML=2.4  EMSC   NEVADA

O: 13MAR2020 23:46:13  37.5N  117.8W ML=2.0  EMSC   NEVADA

O: 13MAR2020 22:03:49  37.5N  117.8W ML=2.9  EMSC   NEVADA

O: 13MAR2020 22:37:29  37.5N  117.8W Mw=3.7  EMSC   NEVADA

O: 13MAR2020 22:37:29  37.5N  117.7W Mw=4.0  ANSS   NEVADA

P: 12MAR2020 122594    37.3N  118.3W 2.5-4.3 AAAAA  California/Nevada area     

 

An earthquake of M 4.1 was also reported in Southern Alaska today.

NEIC reported this earthquake of M 3.7-4.1 in Southern Alaska  was felt with intensity II-III in the area(s) of Southern Alaska at Anchor Point and Homer.  The last earthquake within about 100 km of this epicenter with M>=4.1 occurred on February 3, 2020 and prior to that as an M 4.2 on December 17, 2019.   Forecast 122688 had expected today's event within this area was likely around March 15 to the northeast of today's epicenter.

 

O: 13MAR2020 22:54:34  60.0N  152.9W ML=4.1  EMSC   SOUTHERN ALASKA              

P: 15MAR2020 122688    60.8N  151.7W 3.2-4.8 AAAAA  Central Alaska              

 

An unusual earthquake of M 4.8 was felt in Tanzania today. NEIC reported maximum intensity V in Tanga and IV in Soni and Lushoto, Tanga, Tanzania and III in Mombasa, Kenya. This is the strongest earthquake in Tanzania within about 250 km of this epicenter since an M 4.9 on December 23, 2007. More recent activity has been confined to a region southwest of today's epicenter by about 250-300 km distance. Forecast 122545 had expected today's activity in this area was likely around March 14.

 

O: 13MAR2020 18:37:43   4.9S   38.5E mb=4.8  EMSC   TANZANIA                     

P: 14MAR2020 122545     5.0S   36.0E 4.0-5.3 AACAA  Indian Ocean               

 

An earthquake to the east of this in the Mid-Indian Ridge of M 4.8 today. It is the strongest within about 200 km of this epicenter since an M 5.1 on November 17, 2019 and prior to that an M 5.0 on July 25, 2018. It may have been promoted by stresses from Tropical Cyclone Herold. This summary had noted this possibility as:

 

"Tropical cyclone Herold (22S) continued today  north of Madagascar with winds up to 80 kts. It is expected to track to the southeast over the next several days and may help promote some oceanic ridge seismicity or Mayotte while in the region." (March 13-14, 2020)

 

O: 13MAR2020 13:10:06  16.2S   67.2E mb=4.8  EMSC   MID-INDIAN RIDGE             

P: 11MAR2020 122493    17.0S   67.0E 4.0-5.3 AAAAA  So. Indian Ocean           

 

A series of moderate events has been occurring in the western Kermadec Islands over the past several days. This may be related to stresses associated with Tropical Cyclone Gretel which is currently passing through the area. This summary had noted this as a potential seismic trigger as:

 

"Tropical cyclone Gretel formed today in the area east of Vanuatu and the Loyalty Islands with winds up to 65 kts. It is expected to pass west of the Loyalty Islands March 15-16 and then into the Kermadec Islands of northern New Zealand. Seismic enhancement is likely the Vanuatu, the Loyalty Islands and the Kermadec Islands in the next four days, including the possibility of a strong regional event in this time period." (March 13-14, 2020)

 

O: 13MAR2020 15:46:02  31.4S  179.7E mb=4.2  EMSC   KERMADEC ISLANDS REGION      

O: 13MAR2020 12:07:13  32.9S  179.7E ML=4.0  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 14MAR2020 122724    31.0S  179.0W 4.0-5.3 AAAAA  So. Kermadec Islands       

 

MODERATE QUAKES SHAKE PANAMA; CHILE; AND NORTHERN JAPAN

 

EARTHQUAKE SUMMARY FOR MARCH 12, 2020

 

The strongest earthquakes in the world today were an M 5.4 in northern Chile and an M 5.3 in the Costa Rica-Panama border region. NEIC reported the event in Panama was felt with intensity IV in Panama at La Concepcion, Palmira and David and III in Volcan, Gualaca, Chiriqui, Los Algarrobos, Finca Blanca and Puerto Armuelles. The location of this epicenter and that in northern Chile at 83 and 70 West longitudes respectively are consistent with them being activated by tidal stresses with the last full moon which was previously described in this summary as:

 

"The full moon will arrive at 17:48 on March 9, 2020. Longitudes which are sub-solar at this time are near 86 West and 94 East. These include Central and western South America and central U.S. in the west and eastern Indonesia and southeastern Asia in the east. Some tidal triggering is possible in these regions in the next week. Tidal triggering is also possible in other areas during this time. This is the second straight super-moon which occurs when the moon and earth are near their closest approach. The last such in February coincided with a period of extreme quiet in global seismicity as the sun and moon were on opposite sides and effectively balancing their tidal effects. Any expected quiet associated with this full moon could be ended with a major quake 4-6 days after as occurred with the Kuril Islands, M 7.0 of February 13, 2020." (March 4-11, 2020)

 

 

The dampening effect of the full moon on global seismicity is coming to an end. As noted in previous issues of this report, a strong earthquake is likely in the next day or two – most likely in the Southwest Pacific which has been active in recent days.

 

The earthquake in the Panama-Costa Rica region of M 5.1-5.3 was the strongest within about 150 km of this epicenter since an M 5.2 north of this on March 7, 2020 and an M 5.3 on January 21, 2020, the only such events during the current year. The last of M>5.3 was an M 6.2 on June 26, 2019. Forecast 122533 had expected a moderate quake in Costa Rica around March 14.

 

O: 13MAR2020 04:46:39   8.3N   82.8W mb=5.1  EMSC   PANAMA-COSTA RICA BORDER REGIO

P: 14MAR2020 122533     9.0N   86.0W 3.5-4.8 AACAA  Costa Rica                  

 

GUC reported the earthquake in Northern Chile was felt with intensity  V in  Tarapaca at Alto Hospicio, Camina, Iquique, Pica; IV in Huara, La Tirana, Mamina, II in Pisagua, Pozo Almonte, Ujina; in Arica and Parinacota with IV in Codpa and Cuya and II in Arica andPocon Chile and in Antofagasta with III in Calama and Quillagua, Chile. NEIC reported this earthquake of M 5.2 in Tarapaca, Northern Chile  was felt with intensity II-III in the area(s) of Tarapaca, Northern Chile at Iquique (V) and Arica (IV) and II-III in Tacan, and Arequipa, Peru and in Calama, Antofagasta, Chile. It is the first reported with M>=5.2 within about 200 km of this epicenter since an M 6.2 on November 1, 2018. The last in this area with M>=5.2 occurred on February 8, 2020 with M 5.2 with the last full moon. Forecast 122510 had expected today's activity was likely within about 50 km of the epicenter around March 11.

 

O: 13MAR2020 02:08:01  20.0S   69.4W Mw=5.2  EMSC   TARAPACA, CHILE              

O: 13MAR2020 02:08     20.0S   69.4W mb=5.4  GUC    Tarapaca at Alto Hospicio, Cam

P: 11MAR2020 122510    20.0S   69.0W 4.0-5.3 AAAAA  So. Peru/Bolivia           

 

An M 5.3 also occurred in northern Honshu, Japan today. NEIC reported maximum shaking at intensity VII in Ishikawa and IV in Kanazawa and Tsuarugi with II-III in Toyama, Nagano, Gifu, and Fukui, Honshu, Japan. This is the strongest earthquake in Northern Honshu, Japan within about 150 km of this epicenter since an M 6.2 on November 22, 2014 and prior to that an M 5.4 on February 8, 2012. Forecast 122610 had expected this event in this area was likely around March 15.

 

O: 12MAR2020 17:18:46  37.3N  136.8E Mw=5.3  EMSC   NEAR WEST COAST OF HONSHU, JAP

P: 15MAR2020 122610    37.0N  135.0E 3.5-4.8 BABAA  No. Honshu, Japan           

 

An earthquake of M 5.3 also was recorded today in Tonga but was not felt.

Forecast 122716 had expected this event was likely in mid-March within about 100 km of this epicenter.

 

O: 12MAR2020 12:50:29  19.2S  173.3W mb=5.3  EMSC   TONGA                         

P: 16MAR2020 122716    20.0S  174.0W 4.0-5.4 BAAAA  Tonga Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in the Rat Islands, Aleutians, Alaska. It was not reported felt in this epicentral area.

The last such earthquake in the Rat Islands occurred a month ago on February 13, 2020 with M 4.9. Forecast 122680 had expected this activity was likely around March 13.

 

O: 12MAR2020 16:20:26  51.2N  178.8E mb=4.3  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 13MAR2020 122680    52.0N  177.0E 4.0-5.6 AABAA  Rat Islands                

 

The strongest earthquake in the U.S. or Canada outside Alaska today was an M 3.4 in the region of Newfoundland, Canada. This is the strongest earthquake within about 200 km of this epicenter since an M 3.8 on May 17, 2008 according to NEIC data. Forecasts 122471 and 122686 had expected today's activity in early to mid-March.

 

O: 12MAR2020 07:24:21  59.6N   57.2W MB=3.4  ECAN Nutak, NL                      

O: 12MAR2020 07:24:21  59.6N   57.2W ML=3.4  EMSC   LABRADOR SEA                 

P:  4MAR2020 122471    61.0N   58.0W 2.5-3.8 CBAAA  Baffin/Davis Strait Canada 

P: 16MAR2020 122686    61.0N   58.0W 2.5-3.8 BBAAA  Baffin/Davis Strait Canada 

 

QUIET WITH FULL MOON MAY BE REACHING AN END

 

EARTHQUAKE SUMMARY FOR MARCH 11, 2020

 

Global seismicity was again at low levels today. This is probably related to the effects of the full moon alignment of March 9 which has tended to dampen seismicity as noted in the tidal forecast in previous issues of this report:

 

"The full moon will arrive at 17:48 on March 9, 2020. Longitudes which are sub-solar at this time are near 86 West and 94 East. These include Central and western South America and central U.S. in the west and eastern Indonesia and southeastern Asia in the east. Some tidal triggering is possible in these regions in the next week. Tidal triggering is also possible in other areas during this time. This is the second straight super-moon which occurs when the moon and earth are near their closest approach. The last such in February coincided with a period of extreme quiet in global seismicity as the sun and moon were on opposite sides and effectively balancing their tidal effects. Any expected quiet associated with this full moon could be ended with a major quake 4-6 days after as occurred with the Kuril Islands, M 7.0 of February 13, 2020." (March 4-11, 2020)

 

There were some indications that this effect is reducing and that some enhancement of seismicity, including the possibility of a large quake is likely in the next several days. This included a gradual increase in maximum magnitude in some regions such as the Southwest Pacific.  NEIC reported an earthquake of M 5.3 in Papua New Guinea  was felt with intensity II-III in the area(s) of Papua New Guinea at Buin, North Solomons. This and an M 5.3 in Tonga were the strongest quakes of the day.

 

O: 11MAR2020 15:16:56   6.9S  155.4E Mw=5.3  EMSC   BOUGAINVILLE REGION, P.N.G.  

P:  4MAR2020 122335     7.0S  154.0E 4.0-5.3 CABAA  New Britain                

 

O: 11MAR2020 19:54:09  19.2S  173.2W mb=5.3  EMSC   TONGA                        

P:  9MAR2020 122498    17.0S  174.0W 4.0-5.3 ACAAA  Tonga Islands              

 

An unusually large M 3.1-3.7 occurred in New York State today. NEIC reported maximum shaking of IV in New York at South Glens Falls, Fort Edward, Hudson Falls, Gansevoort, Lake Lucerne, Fort Ann and III in Glens Falls, Queensbury, Argyle, and Lake George. It has been awhile since an earthquake of M>=3.7 hit within about 150 km of this epicenter in New York. The last such event was an M 3.7 on April 8, 2003 but the last of larger magnitude was an M 5.0-5.2 on April 20, 2002, an event associated with considerable damage, and prior to that an M 4.0 on April 20, 2000. Forecast 122434 had expected this area of New York could see a light earthquake around March 4.

 

O: 11MAR2020 10:43:39  43.3N   73.6W mb=3.1  EMSC   NEW YORK                     

O: 11MAR2020 10:43:40  43.3N   73.6W MB=3.7  ECAN  New York State     

P:  4MAR2020 122434    42.0N   74.0W 2.0-3.8 CBAAA  New York State             

 

An M 3.5 was also felt widely in the region of Kansas today. NEIC reported this earthquake of M 3.5 in Kansas  was felt with intensity III-IV in the area(s) of Kansas at Hope, Woodbine, Herington, White City and Lawrence. It may have been promoted by tidal effects as this area often sees seismic enhancement at new an full moons. The last such event of M>=3.5 in Kansas was an M 4.5 on Janujary 19, 2020 and prior to that an M 3.9 on September 16, 2019. Forecast 122411 had expected an event within about 100 km of this epicenter was likely around March 7.

 

O: 12MAR2020 05:33:48  38.7N   97.0W mb=3.5  EMSC   KANSAS                        

P:  7MAR2020 122411    38.0N   98.0W 2.0-3.8 BAAAA  Southern Plains            

 

The strongest earthquake in the U.S., Canada or vicinity today was an M 4.6 in the Greenland Sea. It was not reported felt in this remote area. The only event of larger magnitude in the Greenland Sea in the past 6 months was an M 4.9 on October 29, 2019. An M 4.2 also was recorded on January 3, 2020. Forecast 122482 had expected today's event within about 100 km of the epicenter was likely around March 11.

 

O: 11MAR2020 21:30:02  78.1N    1.2E mb=4.6  EMSC   GREENLAND SEA                

P: 11MAR2020 122482    79.0N    7.0E 4.0-5.5 AAAAA  Arctic Ocean Region        

 

NEAR-ANTIPODAL EVENTS IN GALAPAGOS AND SUMATRA PROBABLY TIDALLY PROMOTED

 

EARTHQUAKE SUMMARY FOR MARCH 10, 2020

 

A pair of moderate earthquakes of M 5.5-5.6 occurred today in the Galapagos Islands followed by a similar event in Sumatra, Indonesia. These events are nearly antipodal and the second may have been promoted from energy from the first. These events (the Galapagos at 90W and Sumatra at 102E)  are at the longitudes of maximum tidal stress with the current full moon which was complete on March 9 as previously described in this summary:

 

"The full moon will arrive at 17:48 on March 9, 2020. Longitudes which are sub-solar at this time are near 86 West and 94 East. These include Central and western South America and central U.S. in the west and eastern Indonesia and southeastern Asia in the east. Some tidal triggering is possible in these regions in the next week. Tidal triggering is also possible in other areas during this time. This is the second straight super-moon which occurs when the moon and earth are near their closest approach. The last such in February coincided with a period of extreme quiet in global seismicity as the sun and moon were on opposite sides and effectively balancing their tidal effects. Any expected quiet associated with this full moon could be ended with a major quake 4-6 days after as occurred with the Kuril Islands, M 7.0 of February 13, 2020." (March 4-8, 2020)

 

NEIC reported the event in Sumatra was felt with maximum intensity IV in Java and III in Lampung, Indonesia.  A foreshock to the east in Java was felt with intensity VIII in Java at Cidahu and Lemahabang and IV in Cicuruk and Cibadak, Java with lesser shaking at Clomas, Bogor, Sawangan, Depok, Jakarta. This activity may have been promoted by stresses associated with a tropical cyclone currently south of these epicenters. This storm was described in the previous issue of this summary as:

 

"A tropical cyclone may be forming south of Java and Bali. This system is currently located at 14S 117E with winds up to 33 kts and moving to the SSE at 11 kts. Some seismic enhancement may be seen in the region from Bali to Sumbawa, Indonesia and possibly in the Leeward Islands at the antipode (14N 63W)." (March 9-10, 2020)

 

This is the strongest earthquake within about 200 km of this epicenter since an M 5.5 on March 7, 2017 and an M 5.5 on January 12, 2017. An M 5.9 hit about 200 km northwest of this on October 14, 2019. Forecast 122342 had expected today's event was likely around March 10.

 

O: 10MAR2020 14:06:26   5.9S  102.9E Mw=5.5  EMSC   SOUTHERN SUMATRA, INDONESIA  

P: 10MAR2020 122342     4.0S  102.0E 4.0-5.3 ABAAA  So. of Sumatera            

 

The earthquake in the Galapagos Islands of M 5.5, as noted above was probably promoted by the full moon as it occurred near the longitude of maximum tidal stress (90W vs 85W) in an area where fluids are instrumental in seismicity. It was not reported felt. A similar M 5.5 hit the Galapagos on June 26, 2018 and ten years ago on January 29, 2010 but the last of larger magnitude was an M 5.9 on February 4, 2006, the largest such event in the past 30 years. Forecast 122325 had expected today's event was likely within about 20 km of today's epicenter in early March.  This epicenter is at the third node (120 degrees) from the M 6.8 in Turkey of January 24, and may have been promoted by energy from that source.

 

O: 10MAR2020 11:13:48   1.1N   90.9W Mw=5.5  EMSC   GALAPAGOS ISLANDS REGION     

P:  4MAR2020 122325     1.0N   91.0W 3.5-4.9 CAAAA  Galapagos Islands          

 

The strongest earthquake in the U.S. or Canada today was an M 3.7-3.9 earthquake was widely felt along the northern California-Nevada border today near Truckee. NEIC reported maximum shaking IV at Truckee with II-III in California at Tahoe National Forest, Sierraville, Soda Springs, Loyalton, Calpine, Camelian Bay and Kings Beach and in Reno, Nevada. NEIC reported an aftershock of M 2.8 in Northern California  was felt with intensity II-III in the area(s) of Northern California at Sierraville, Truckee, Alta, Foresthill, Grass Valley and Penn Valley. It is the strongest earthquake in this area since an M 4.1 and 4.8 on August 2 and 4, 2016. Forecast 122381 had expected today's event within about 25 km around March 7. This epicenter is at 100 degrees) from the M 6.8 in Turkey of

January 24, and may have been promoted by energy from that source.

 

O: 11MAR2020 01:17:15  39.5N  120.3W ML=3.9  EMSC   NORTHERN CALIFORNIA          

O: 11MAR2020 01:31:00  39.5N  120.3W ml=2.1  EMSC   NORTHERN CALIFORNIA

O: 11MAR2020 04:32:30  39.5N  120.3W ml=2.8  EMSC   NORTHERN CALIFORNIA

P:  7MAR2020 122381    39.4N  120.5W 2.5-4.6 BAAAA  Central California         

 

M 5.0-5.3 IN XIZANG, CHINA PROBABLY TRIGGERED BY FULL MOON

 

EARTHQUAKE SUMMARY FOR MARCH 9, 2020

 

The strongest earthquake in the world today was an M 5.0-5.3 in Western Xizang, China. It was followed by an unusually strong aftershock sequence Western Xizang, China. The mainshock occurred within minutes of local solar midnight and the full moon, an hour when strong tidal effects can be expected and occurred within half an hour of the full moon over the epicenter. This activity was near the longitude of maximum tidal stresses as noted in previous issues of this summary:

 

"The full moon will arrive at 17:48 on March 9, 2020. Longitudes which are sub-solar at this time are near 86 West and 94 East. These include Central and western South America and central U.S. in the west and eastern Indonesia and southeastern Asia in the east. Some tidal triggering is possible in these regions in the next week. Tidal triggering is also possible in other areas during this time. This is the second straight super-moon which occurs when the moon and earth are near their closest approach. The last such in February coincided with a period of extreme quiet in global seismicity as the sun and moon were on opposite sides and effectively balancing their tidal effects. Any expected quiet associated with this full moon could be ended with a major quake 4-6 days after as occurred with the Kuril Islands, M 7.0 of February 13, 2020." (March 4-8, 2020)

 

The M 5.0-5.3 is the strongest earthquake within about 250 km of this epicenter in nearly six years when an M 5.3 occurred to the southeast on March 30, 2014. The last event of larger magnitude in this area was an M 5.4-5.6 on February 24, 2013. Forecast 122419 had expected this activity in Xizang was possible around March 10. This epicenter is at the third node (120 degrees) from the M 7.7 south of Cuba of January 28 and may have been promoted by energy from that source.

 

O: 09MAR2020 18:24:24  32.8N   85.5E ML=4.6  EMSC   WESTERN XIZANG

O: 10MAR2020 00:42:18  32.8N   85.6E ML=4.1  EMSC   WESTERN XIZANG

O: 09MAR2020 18:38:50  32.8N   85.6E mb=4.1  EMSC   WESTERN XIZANG

O: 09MAR2020 18:12:09  32.8N   85.7E mb=5.0  EMSC   WESTERN XIZANG

O: 09MAR2020 18:12:09  32.8N   85.6E mb=5.3  ANSS   WESTERN XIZANG

O: 10MAR2020 00:20:12  32.9N   85.4E mb=4.2  EMSC   WESTERN XIZANG

O:  9MAR2020 18:20:01  32.6N   85.3E ML=4.8  EMSC   WESTERN XIZANG               

P: 10MAR2020 122419    30.0N   88.0E 3.8-5.1 ACCAA  Xizang                     

 

Moderate regional events in southern China also occurred near the eastern Xizang-India border (M 4.6) and in southern Xinjiang, China (M 4.3).

Forecast 122370 and 122389 had expected further regional seismicity in early March.

 

O:  9MAR2020 23:30:05  28.9N   93.3E ML=4.6  EMSC   EASTERN XIZANG-INDIA BORDER RE

P: 11MAR2020 122370    27.0N   92.0E 4.0-5.3 ABAAA  Myanmar                    

 

O:  9MAR2020 21:44:27  36.1N   80.1E mb=4.3  EMSC   SOUTHERN XINJIANG, CHINA     

P:  4MAR2020 122389    35.0N   74.0E 3.8-5.1 BACAA  Hindu Kush/Pakistan        

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Unimak Island region of Alaska. It was not reported felt in this remote area. The only earthquake in the Unimak area in the past six months of larger size was an M 4.4 on March 1, 2020. Forecast 122469 had expected today's event was likely in this area around March 8. This epicenter is at the fifth node from the M 7.7 south of Cuba of January 28 and may have been promoted from that source.

 

O:  9MAR2020 14:42:54  53.8N  163.1W mb=4.2  EMSC   UNIMAK ISLAND REGION, ALASKA 

P:  8MAR2020 122469    54.3N  161.4W 3.5-5.1 AAAAA  Unimak Islands, Aleutians  

 

A pair of light earthquakes occurred today in the areas of southern Maine and in the Gulf of Maine. Neither of these events were reported felt in the epicentral area. The largest was and M 2.7-3.1 in the Gulf of Maine. It is the largest in the area within about 150 km of this epicenter since an M 3.0 on June 21, 2013 and an M 4.0 on October 16, 2012. The M 2.2-2.7 within southern Maine was the largest within about 100 km since the M 3.0 on June 21, 2013. Forecast 122429 had expected today's activity was likely in Maine around March 8.

 

O:  9MAR2020 18:57:15  43.3N   69.8W mb=2.7  EMSC   GULF OF MAINE                

O: 09MAR2020 18:57:14  43.2N   69.7W MB=3.1  ECAN Maine     

O: 09MAR2020 12:07:27  44.6N   70.0W MB=2.7  ECAN Maine     

O:  9MAR2020 12:07:26  44.6N   70.0W ML=2.2  EMSC   MAINE                        

P:  8MAR2020 122429    47.0N   70.0W 2.0-4.1 AAAAA  Maine                      

 

The activity in Maine was preceded by an M 3.7 in Grand Bank, Newfoundland, Canada on March 8. It was directly to the east of the M 2.2-2.7 in Maine. This area is capable of large submarine landslides and can trigger regional tsunamis but this event is too small to trigger a tsunami. The last events in the Grand Banks with M>=3.7 occurred as an M 3.7 on August 6, 2018 and an M 4.7 on January 25, 2005. In the past 30 years two other events of M 3.9-4.3 have been recorded in this area - an M 4.3 on Marcy 17, 1998 and an M 3.9 on November 2, 1999.

 

O:  8MAR2020 20:09:15  44.6N   56.4W MB=3.7  ECAN Grand Bank, NL                 

 

MODERATELY STRONG M 5.8 RATTLES NORTHERN CALIFORNIA COAST

 

EARTHQUAKE SUMMARY FOR MARCH 8, 2020

 

The strongest earthquake in the world today was an M 5.8 off the Coast of Northern California. NEIC reported it was felt along the coast with maximum intensity at Ferndale, Petrolia, Loleta, Rio Dell, Fortuna, Hydesville, and Scotia and III in Samoa, Eureka. A moderate aftershock of M 4.9-5.0 off the coast of California was reported by NEIC to have been felt with intensity II-III along the coast of Northern California at Ferndale, Petrolia, Loleta, Rio Dell, Fortuna, Samoa, Hydesville, Eureka and Scotia. Several smaller aftershocks of M 2.9 and 2.5 were also lightly felt along the coast. This appears to be the culminating event in the regional activation which began in Alaska several days ago and was alluded to in this summary in previous issues as:

 

"The activation of Alaska and the northwest North American Plate at this time is reminiscent of the activation of early July, 2019 which culminated in the M 7.1 Ridgecrest, California event of July 6, 2019." (March 2, 2020)

 

Today's activity off the coast of northern California may also be related to the arrival of the full moon on March 9. The forecast associated with that tidal event reads:

 

"The full moon will arrive at 17:48 on March 9, 2020. Longitudes which are sub-solar at this time are near 86 West and 94 East. These include Central and western South America and central U.S. in the west and eastern Indonesia and southeastern Asia in the east. Some tidal triggering is possible in these regions in the next week. Tidal triggering is also possible in other areas during this time. This is the second straight super-moon which occurs when the moon and earth are near their closest approach. The last such in February coincided with a period of extreme quiet in global seismicity as the sun and moon were on opposite sides and effectively balancing their tidal effects. Any expected quiet associated with this full moon could be ended with a major quake 4-6 days after as occurred with the Kuril Islands, M 7.0 of February 13, 2020." (March 4-8, 2020)

 

The last earthquake off the coast of Northern California with M>=5.8 was an M 5.8 on January 25, 2018 and prior to that an M 6.5 on December 8, 2016.  Forecasts 122440 and 122439 had expected today's activity was likely within about 25 km of today's epicenter was likely around March 7-8.

 

A foreshock of M 2.4 occurred about 12 hours before the mainshock of M 5.8. The  last event of M>=3.8 in the region was a foreshock on February 22, 2020 with the new moon of February 23. At the time this summary noted the relation as:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.3 off the coast of Northern California. NEIC reported it was felt with intensity II-III in California at Petrolia, Ferndale, Rio Dell, Fortuna, Eureka, Whitethorn, Carlotta, Myers Flat and Redway. This event may have been promoted by the new moon as it occurred within half an hour of local solar noon. The new moon arrived today as noted in previous issues of this summary:

 

"The New Moon will arrive on February 23, 2020 at 15:32 UT. Longitudes which are sub-solar at this time are near 52 West while those antisolar are at 128 East longitude. These include areas of the Central Atlantic such as Puerto Rico and the South Sandwich Islands in the west and central Indonesia, the Philippines and Japan in the east. A strong tidally enhanced earthquake is possible in the next six days. Other tidal enhancement would promote larger quakes near local solar noon and midnight. Many other areas of the earth can also see tidal enhancement of seismicity at this time." (February 21-22, 2020)

 

This event is the strongest within about 100 km of this epicenter since an M 5.2 on October 28, 2019 and prior to that an M 5.6 on June 23, 2019 in the regional activation of June and early July 2019. Forecast 122235 had expected today's event within about 25 km of this epicenter was likely around February 23. This epicenter is at the sixth node (60 degrees) from the M 7.0 in the Kuril Islands of February 13, 2020 and was probably promoted by energy from this event." (February 23, 2020)

 

O: 09MAR2020 06:29:38  40.3N  124.8W Md=2.4  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 09MAR2020 06:33:00  40.4N  125.0W Mw=5.0  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 09MAR2020 06:12:59  40.4N  125.1W Md=2.5  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 09MAR2020 02:59:09  40.4N  125.1W Mw=5.8  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 09MAR2020 05:01:08  40.4N  125.2W ML=2.5  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 08MAR2020 18:24:40  40.4N  125.2W Md=2.6  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 09MAR2020 04:10:21  40.5N  125.0W Md=2.5  EMSC   OFFSHORE NORTHERN CALIFORNIA

O:  9MAR2020 07:24:38  40.5N  125.0W Md=2.5  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  7MAR2020 122440    40.9N  126.3W 2.5-4.5 AAAAA  Off Coast of No. Calif     

P:  8MAR2020 122439    40.3N  124.7W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

A series of moderate earthquakes occurred today in the Ocean Ridges of the world. These events were not reported felt in these remote epicentral areas of the Azores (M 5.1); South Georgia Island (M 4.9); the Reykjanes Ridge in the north Atlantic (M 4.9); in the Central Mid-Atlantic (M 5.0) and the Northern Mid-Atlantic (M 4.9). Forecasts in this summary (122396, 122528, 122463, 122322 and 122396) had expected these events in early March, generally within about 100 km.

 

O:  8MAR2020 20:58:59  37.7N   31.6W Mw=5.1  EMSC   AZORES ISLANDS REGION        

P:  4MAR2020 122396    38.0N   32.0W 4.0-5.4 BAAAA  No. Mid-Atlantic Ridge     

 

O:  8MAR2020 10:56:27  55.3S   35.8W mb=4.9  EMSC   SOUTH GEORGIA ISLAND REGION  

P:  9MAR2020 122528    55.0S   29.0W 4.0-5.6 AACAA  So. Sandwich Islands       

 

O:  8MAR2020 15:38:24  57.2N   33.5W mb=4.9  EMSC   REYKJANES RIDGE              

P:  4MAR2020 122463    58.0N   32.0W 4.0-5.4 BAAAA  North Mid-Atlantic Ridge   

 

O:  8MAR2020 22:49:00   7.3N   35.7W mb=5.0  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P:  2MAR2020 122322     7.0N   35.0W 4.0-5.3 CAAAA  Central Mid-Atlantic Ridg  

 

O:  8MAR2020 11:16:23  33.9N   38.6W mb=4.9  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P:  8MAR2020 122396    31.0N   41.0W 4.0-5.4 ACBAA  No. Mid-Atlantic Ridge     

 

MADEIRA ISLANDS SHAKE AGAIN

 

EARTHQUAKE SUMMARY FOR MARCH 7, 2020

 

A moderate earthquake of M 5.2 shook the Madeira Islands southwest of Portugal today. NEIC reported maximum intensity V in the Madeira Islands at Canico and Machco and IV in Santa Cruz, Funchal, Camara de Lobos, Campanario, and Ponta do Sol with less shaking up to 100 km from the epicenter. It is the second moderate quake in the Madeira Island in a week - following an M 4.8 on February 29, 2020. At the time of that event this summary noted:

 

"An unusually large M 4.8 earthquake was felt in the Madeira Islands of Portugal today. The last such earthquake in the Madeira Island area was an M 4.8 on August 15, 2007, but today's event is the strongest within about 300 km of this epicenter in at least 30 years. Other events of M 4.8-5.0 about 300 km to the northeast of this occurred in 2006, 2005 and 1990. This may be related to regional volcanism. Forecast 122185 had expected today's event was likely to the northeast around February 26." (February 29, 2020)

 

The earthquakes in the Madeira Islands are at 101 degrees from the M 7.0 in the

Kuril Islands of February 13 and may have been promoted from energy from that event. An M 4.9 in the Macquarie Islands south of Australia today was also at 101 degrees from the Kuril epicenter.

 

O:  7MAR2020 20:58:02  32.2N   16.8W Mw=5.2  EMSC   MADEIRA ISLANDS, PORTUGAL REGI

O:  7MAR2020 21:22:30  32.3N   16.8W mb=4.3  EMSC   MADEIRA ISLANDS, PORTUGAL REGI

 

A light to moderate aftershock of M 3.8 shook the region of Coso Junction, California today. NEIC reported maximum intensity V in Bodfish, California and II-III in Lone Pine, Inyokern, Ridgecrest and Springville. An M 3.7 occurred earlier in the day in the Coso Junction region and was reported felt with light intensity in Inyokern and Ridgecrest, California. This event follows an M 5.6 in northern Baja California yesterday and may be part of the regional activation which started in Alaska several days ago. This summary had noted this on March 2 as:

 

"The activation of Alaska and the northwest North American Plate at this time is reminiscent of the activation of early July, 2019 which culminated in the M 7.1 Ridgecrest, California event of July 6, 2019." (March 2, 2020)

 

Today's activity in California may also be related to the arrival of the full moon on March 9. The forecast associated with that tidal event reads:

 

"The full moon will arrive at 17:48 on March 9, 2020. Longitudes which are sub-solar at this time are near 86 West and 94 East. These include Central and western South America and central U.S. in the west and eastern Indonesia and southeastern Asia in the east. Some tidal triggering is possible in these regions in the next week. Tidal triggering is also possible in other areas during this time. This is the second straight super-moon which occurs when the moon and earth are near their closest approach. The last such in February coincided with a period of extreme quiet in global seismicity as the sun and moon were on opposite sides and effectively balancing their tidal effects. Any expected quiet associated with this full moon could be ended with a major quake 4-6 days after as occurred with the Kuril Islands, M 7.0 of February 13, 2020." (March 4-8, 2020)

 

An unusually large M 4.0 occurred in South Africa today. This is the largest event in South Africa within about 250 km of this epicenter since an M 4.8 a year ago on March 7, 2019. Forecast 122506 had expected today's event within about 150 km of this epicenter was likely around March 9.

 

O:  7MAR2020 15:02:13  26.1S   29.3E ML=3.0  EMSC   SOUTH AFRICA                 

O:  8MAR2020 05:58:18  27.0S   26.7E ML=4.0  EMSC   SOUTH AFRICA                 

P:  9MAR2020 122506    26.0S   28.0E 3.0-4.3 AAAAA  Rep. South Africa          

 

STRONG INDIAN OCEAN QUAKE FOLLOWED BY NEAR-ANTIPODAL BAJA, CALIFORNIA M 5.6

 

EARTHQUAKE SUMMARY FOR MARCH 6, 2020

 

The day began with an M 5.9 in the Southwest Indian Ridge and ended with an M 5.6 near the antipode in the Gulf of California in the antipodal region to the Indian Ocean epicenter. Antipodal triggering can occur because the earth's near-spherical shape focuses surface energy at the point opposite on the earth from the epicenter of large earthquakes (the antipode). Strong energy sources on the earth's surface such as large earthquakes and tropical cyclones have been noted repeatedly in this summary as triggers for seismicity near the antipode of those events. The M 5.9 in the Southwest Indian Ridge was not reported felt in this remote area. It was the strongest in the world today. The last event within about 300 km of this epicenter, and the only such event with M>=5.9 in the past

30 years occurred on September 24, 2019 with M 6.1. When this event occurred in September, this summary noted the relation to southern California as:

 

"The last of larger magnitude in this region was an M 6.4 on April 12, 1988.

The largest earthquake ever recorded in this area was an M 7.9 on December 8, 1951 months before the M 7.9 in Bakersfield, California in July, 1952." (September 25, 2019)

 

Forecast 122519 had expected this event in the South Indian Ocean was possibly around March 5. This epicenter is located at the fifth node (72 degrees) from the M 6.8 in Eastern Turkey of January 24 and near 144 degrees from the M 7.7 south of Cuba of January 28, 2020 and may have been promoted by energy from those sources.

 

O:  6MAR2020 10:28:41  31.4S   58.3E Mw=5.9  EMSC   SOUTHWEST INDIAN RIDGE       

P:  5MAR2020 122519    35.0S   55.0E 4.0-5.3 ACCAA  So. Indian Ocean            

 

The strongest earthquake in the U.S, Canada and vicinity today was an M 5.6 along the border of Southern California and Baja California, Mexico. NEIC reported maximum intensity IV-V in Baja California at Ejido, Delta, Guadalupe, Mexicali and Reacomodo. It was also felt with intensity II-III in Estacion Coahuila and Puebla, Baja and in San Luis Rio Colorado, Sonora, Mexico and in southern California at Heber and Somerton, Arizona among others. Light to moderate shaking occurred as far as Arizona; Los Angeles California and along the Colorado River to the north.  When a smaller event occurred southeast of this yesterday, this summary noted:

 

 

"The strongest earthquake in the U.S. and vicinity or Canada was an M 4.3 in the Gulf of California, Baja, Mexico. It was followed by an M 3.8 aftershock. Neither of these events was reported felt in this remote area. This is an active area with the last event in the area of M>=4.3 on February 13, 2020 (M 4.3 and December 12, 2019 (M 4.4). Swarms such as occurred on April 6, 2019 with maximum event M 5.3 are not uncommon in the area. Forecast 122367 had expected activity in the northern Gulf of California was likely around March 8. This activity is at the fifth node (72 degrees) from the M 7.0 in the Kuril Islands of February 13 and may have been promoted by energy from that source." (March 5-6, 2020)

 

When a series of light earthquakes hit near today's epicenter on March 2, 2020 this summary also noted:

 

"A series of light earthquakes also occurred along the California-Baja Mexico border today. The strongest of these was an M 3.0. Occasionally swarms such as this in this area can grow into larger events so this is an area to watch. Forecast 122195 had expected today's activity was likely within about 50 km of the epicenter at the end of February or in early March, 2020." (March 2-3, 2020)

 

The last event of M>=5.6 in Baja California within about 100 km of this epicenter occurred as an M 5.8 on June 15, 2010 - an aftershock of the M 7.2 Easter Day quake in Baja California of April 4, 2010.  Forecast 122367 had expected activity in the northern Gulf of California around March 8. This epicenter is located at the fifth node (72 degrees) from the M 7.0 in the Kuril Islands of February 13 and may have been promoted by energy from that source.

 

O:  7MAR2020 03:52:02  31.7N  114.6W Mw=5.6  EMSC   GULF OF CALIFORNIA           

P:  8MAR2020 122367    28.0N  112.0W 3.5-4.9 ACBAA  Gulf of California         

 

The earthquake in Baja California was also preceded by a moderate M 5.2 in Costa Rica. NEIC reported maximum intensity V ini Monte Lirio, Panama and Daniel Flores, San Jose, Costa Rica and IV in Cerro Punta, Volcan Chiriqui, Panama and in Costa Rica at Golfito, and San Isidro, among others. The only event of larger magnitude in Costa Rica in the past six months was an M 5.3 on January 21, 2020. Forecast 122324 had expected today's event within about 100 km was likely around March 6.

 

O:  7MAR2020 02:40:49   9.1N   83.1W Mw=5.2  EMSC   COSTA RICA                   

P:  6MAR2020 122324     9.0N   84.0W 3.5-4.8 AAAAA  Costa Rica                 

 

An M 4.8-4.9 east of the Dominican Republic today was felt with maximum intensity IV in Ensenada, Puerto Rico and III in Mayaguez, and in the Dominican Republic at Boca de Yuma, Higuey, Otra Banda, La Romana, Hato Mayor, and Los Llanos. This event is about 200 km west of the active zone in southern Puerto Rico where an M 6.5 hit on January 7 and may have been triggered by stress redistribution from that event. The last earthquake within about 100 km of today's epicenter with M>=4.9 occurred on February 4, 2019 and prior to that as an M 5.8 on May 28, 2014.  Forecast 122361 had expected today's event within this area was possibly around March 5.

 

O: 07MAR2020 04:15:29  18.5N   69.0W ML=3.1  EMSC   DOMINICAN REPUBLIC

O: 06MAR2020 08:32:16  18.8N   69.4W ML=3.2  EMSC   DOMINICAN REPUBLIC

O: 06MAR2020 20:19:54  19.1N   68.0W ML=3.0  EMSC   DOMINICAN REPUBLIC REGION

O: 07MAR2020 03:46:55  19.6N   69.9W ML=3.0  EMSC   DOMINICAN REPUBLIC

O:  6MAR2020 12:40:41  18.0N   68.4W mb=4.9  EMSC   DOMINICAN REPUBLIC REGION    

P:  5MAR2020 122361    19.0N   69.0W 3.4-4.8 AAAAA  Puerto Rico                

 

An earthquake of M 3.9-4.3 also shook the aftershock zone in southern Puerto Rico near Ponce today. NEIC reported this earthquake of M 3.9-4.3 in Southern Puerto  was felt with intensity IV in the area(s) of Southern Puerto at Guanica, Yauco and Cabo Rojo and II-III in Puerto Rico at Ensenada, Lajas, Sabana Grande, Ponce, San German and Las Manas among others. The last aftershock in this area of M>=4.3 was an M 4.3 on February 12, 2020, the last with larger magnitude was an M 5.0 on February 2, 2020. Forecast 122360 had expected today's activity around March 4 in the aftershock zone.

 

O: 07MAR2020 06:03:09  17.9N   66.7W Md=3.1  EMSC   PUERTO RICO REGION

O: 07MAR2020 05:45:31  17.9N   66.8W Md=3.0  EMSC   PUERTO RICO REGION

O: 06MAR2020 10:10:23  17.9N   66.8W Md=3.1  EMSC   PUERTO RICO REGION

O: 07MAR2020 05:55:11  17.9N   66.9W Md=3.0  EMSC   PUERTO RICO REGION

O:  7MAR2020 02:26:50  17.9N   66.9W mb=4.3  EMSC   PUERTO RICO REGION           

P:  4MAR2020 122360    18.0N   67.0W 3.4-4.8 BAAAA  Puerto Rico                

 

An earthquake of M 5.5 was also felt in Vanuatu today. This event was reported by NEIC to have been felt with intensity III ini Vila Shefa, Vanuatu. The last event in Vanuatu of M>=5.5 occurred December 14, 2019 about 400 km north of today's epicenter with M 5.9. Forecast 122501 had expected today's event within

about 25 km was likely around March 6.

 

O:  7MAR2020 05:43:45  17.8S  167.8E Mw=5.5  EMSC   VANUATU                      

O:  7MAR2020 06:39:08  18.0S  167.6E mb=4.8  EMSC   VANUATU                      

P:  6MAR2020 122501    18.0S  168.0E 4.0-5.4 AAAAA  Vanuatu Islands             

 

An unusual earthquake of M 2.7-3.2 was widely felt in the Saint Lawrence Valley, Quebec, Canada today. NEIC reported light shaking at intensity II-III in Montreal, Vercheres, Beloeil, L'Epiphanie, Sainte-Anne-des-Plaines, Sainte-Sophie, Saint-Remi, Saint-Jean-sur-Richeliew, Sainte-Martine and Salaben-de-Valleyfield, Quebec, Canada. Earthquakes Canada reported it was felt in Montreal. The last earthquake with M>=3.2 within about 100 km of today's epicenter occurred on January 13, 2020 with M 3.4 and prior to that on November 28, 2015 with M 3.3. Forecast 122433 had expected today's activity was likely in this area around March 2.

 

O:  6MAR2020 08:22:16  45.6N   73.6W mb=2.7  EMSC   ST. LAWRENCE VALLEY REG., CANA

O: 06MAR2020 08:22:15  45.6N   73.5W MB=3.2  ECAN Montreal, QC. Felt   

P:  2MAR2020 122433    45.0N   73.0W 2.0-3.8 BAAAA  New England                

 

MODERATE QUAKE IN KERMADEC ISLANDS CONTINUES IN GLOBAL QUIET PERIOD

 

EARTHQUAKE SUMMARY FOR MARCH 5, 2020

 

The quiet global seismicity pattern which has held for several weeks continued unabated today. This may be related to the lack of triggering effects - no tropical cyclones, no strong geomagnetic storms and no major earthquakes at this time. This may change with the full moon of March 9 as noted in this summary:

 

"The full moon will arrive at 17:48 on March 9, 2020. Longitudes which are sub-solar at this time are near 86 West and 94 East. These include Central and western South America and central U.S. in the west and eastern Indonesia and southeastern Asia in the east. Some tidal triggering is possible in these regions in the next week. Tidal triggering is also possible in other areas during this time. This is the second straight super-moon which occurs when the moon and earth are near their closest approach. The last such in February coincided with a period of extreme quiet in global seismicity as the sun and moon were on opposite sides and effectively balancing their tidal effects. Any expected quiet associated with this full moon could be ended with a major quake 4-6 days after as occurred with the Kuril Islands, M 7.0 of February 13, 2020." (March 5-6, 2020)

 

The strongest earthquake in the world today was an M 5.6 in the Kermadec Islands of northern New Zealand. It was not reported felt in this remote area. The last earthquakes of equal of larger magnitude in the region of the Kermadec Islands occurred on December 18, 2019 and October 24, 2019 with M 5.9 and 5.7 respectively. Forecast 122517 had expected a moderate event in the northern Kermadec Islands was likely around March 5. This epicenter is at 105 degrees from the M 7.7 in Cuba of January 28 and may have been promoted by concentrated energy from that source.

 

O:  5MAR2020 13:11:45  29.8S  176.1W mb=5.6  EMSC   KERMADEC ISLANDS REGION      

P:  5MAR2020 122517    30.0S  179.0W 4.0-5.3 AACAA  No. Kermadec Islands       

 

A moderate earthquake of M 5.4 also occurred in the Southern Mid-Atlantic Ridge today. It was not reported felt in this remote epicentral area. It occurred near local solar noon and may have been affected by tidal stresses. The last event with M>=5.4 within about 300 km of this epicenter occurred on March 17, 2018 an prior to that on June 13, 2014 (N 5.5-5.6). The only event of M>=6 in the region in the past 30 years was an M 6.0 on October 21, 2000 (M 6.0). Today's event was probably on one of the transform faults in the area and a tsunami is highly unlikely. Forecast 122524 had expected moderate seismicity in this area was likely around March 6.

 

O:  5MAR2020 14:58:46  48.9S    8.9W mb=5.4  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P:  6MAR2020 122524    44.0S   16.0W 4.0-5.3 ACCAA  So. Mid-Atlantic Ridge     

 

A moderate earthquake also occurred in the area of Northern Venezuela and the Trinidad and Tobago Islands today. NEIC reported this earthquake of M 5.0 in Northern Venezuela  was felt with intensity II-III in the area(s) of Northern Venezuela at Mucurape Diego Martin, Port of Spain, Tunapuna, Chaguanas, Arima, Tabquite Couva, Sangre Grande, Trinidad and Tobago and in Saint George's Grenada. A slightly smaller M 4.6 hit the area about 50 km southwest of this on February 29, but the last event of M>=5.0 within about 200 km of this epicenter was an M 5.5 on September 9, 2019 and an M 5.0 on April 28, 2019. Forecast 122363 had expected today's activity in this area was likely to the southwest around March 8.

 

O:  6MAR2020 02:44:51  11.0N   62.3W Mw=5.0  EMSC   OFFSHORE SUCRE, VENEZUELA    

P:  8MAR2020 122363    10.0N   63.0W 3.4-4.8 AAAAA  Windward Islands           

 

The strongest earthquake in the U.S. and vicinity or Canada was an M 4.3 in the

Gulf of California, Baja, Mexico. It was followed by an M 3.8 aftershock. Neither of these events was reported felt in this remote area. This is an active area with the last event in the area of M>=4.3 on February 13, 2020 (M 4.3 and December 12, 2019 (M 4.4). Swarms such as occurred on April 6, 2019 with maximum event M 5.3 are not uncommon in the area. Forecast 122367 had expected activity in the northern Gulf of California was likely around March 8. This activity is at the fifth node (72 degrees) from the M 7.0 in the Kuril Islands of February 13 and may have been promoted by energy from that source.

 

O:  5MAR2020 07:23:26  30.2N  114.0W ML=4.3  EMSC   GULF OF CALIFORNIA           

O:  5MAR2020 07:54:58  30.2N  114.1W ML=3.8  EMSC   GULF OF CALIFORNIA           

P:  8MAR2020 122367    28.0N  112.0W 3.5-4.9 BCBAA  Gulf of California         

 

MODERATE QUAKE SHAKES ARGENTINA

 

EARTHQUAKE SUMMARY FOR MARCH 4, 2020

 

The strongest earthquake in the world today was an M 5.5 at an intermediate focus beneath Argentina. GUC reported this earthquake was felt with intensity   IV in Chile at  Coquimbo at La Higuera and Paiguano and III in Andacollo, La Serena, Vicuna; Atacama with II in Alto del Carmen, Copiapo and Tierra Amarilla, Chile. This is the strongest earthquake within about 150 km of this epicenter since an M 5.7 on November 3, 2019 and prior to that an M 5.6 on August 1, 2017. The last of significantly larger magnitude was an M 6.2 on November 13, 2016. Forecast 122297 had expected today's event within about 50 km of the epicenter at the end of February or early March, 2020. This epicenter is at the third node (120 degrees) from the M 6.8 in eastern Turkey of January 24, 2020 and may have been promoted by energy from that event.

 

O:  5MAR2020 06:57:41  28.4S   67.5W Mw=5.5  EMSC   LA RIOJA, ARGENTINA          

O:  5MAR2020 06:57     28.4S   67.9W mb=5.5  GUC    Coquimbo at La Higuera and Pai

P:  9MAR2020 122502    29.0S   68.0W 4.0-5.4 BAAAA  Argentina                  

P: 27FEB2020 122297    28.0S   68.0W 4.0-5.3 CAAAA  Argentina                  

 

The strongest earthquakes in the U.S. or Possessions today occurred as an M 4.8 and 4.5 in the region of Guam.  NEIC reported this earthquake of M 4.8 in Guam  was felt with intensity IV-V   in the area(s) of Guam at Mangilao, Barrigada, Tamuning, Dededo, Yona, Talofofo, Hagatna, Merizo and III in Yigo and Santa Rita.  Guam is an active area with the last events of M>=4.8 on February 25 (M 4.8) and February 19, 2020 (M 5.2). Forecast 122362 had expected today's activity was likely around March 5-6.

 

 

O:  5MAR2020 01:57:23  13.1N  143.7E mb=4.5  EMSC   GUAM REGION                  

O:  4MAR2020 19:37:14  13.3N  145.0E mb=4.8  EMSC   GUAM REGION                  

P:  5MAR2020 122362    12.0N  145.0E 4.0-5.4 ABAAA  So. Marianas/Guam          

P:  6MAR2020 122362    14.0N  145.0E 4.0-5.3 AAAAA  So. Marianas/Guam          

 

MODERATE ACTIVITY IN SOUTHERN VANUATU ISLANDS

 

EARTHQUAKE SUMMARY FOR MARCH 3, 2020

 

The strongest earthquake in the world on a quiet day in global seismicity occurred today as an M 5.0 in the Arctic Ocean north of Svalbard and an M 5.0 and 4.8 in Central Vanuatu. The last earthquakes of M>=5 within about 200 km of this epicenter occurred north of this on January 10 and 11, 2020 with M 5.4 and 5.1. Today's event was not reported felt in this epicentral location. Forecast 122501 had expected today's event within about 50 km was likely around March 6.

 

O:  3MAR2020 15:53:51  17.9S  167.5E mb=5.0  EMSC   VANUATU                      

O:  3MAR2020 22:21:59  17.9S  167.7E mb=4.8  EMSC   VANUATU                      

P:  6MAR2020 122501    18.0S  168.0E 4.0-5.4 BAAAA  Vanuatu Islands            

 

A similar M 5.0 hit the area north of Svalbard on January 7, 2020 (M 5.2) and

February 9, 2020 (M 5.0). A moderate quake of M 5.4 also hit about 700 km to the northeast in the region North of Svalbard on February 18, 2020.

 

O:  3MAR2020 11:57:23  80.0N    0.4W mb=5.0  EMSC   NORTH OF SVALBARD            

 

The strongest earthquake in the U.S. or Canada today was an aftershock of M 5.1 in western Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote epicentral area. This is an aftershock of the M 5.7 that hit the same aea on March 2, 2020. Forecast 122454 had expected this activity was likely around March 4. At the time of the M 5.7 this summary noted in this regard:

 

"The strongest earthquake in the world today was an M 5.7 in the western Andreanof Islands, Alaska. NEIC reported it was felt with intensity IV in Atka, Alaska. This is part of an aftershock series which follows the M 6.2 on January 23, 2020 and the M 6.1 on January 26, 2020. No aftershocks of M>=5.7 have hit the area since that time. Forecasts 122454 and 122251 had expected today's activity was likely in late February or early March, 2020." (March 1-2,  2020)

 

O:  3MAR2020 08:42:03  51.2N  179.8W mb=5.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  4MAR2020 122454    51.7N  179.7W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

 

The strongest earthquake felt in the U.S. or Canada today was an M 4.0 in Central California. NEIC reported it was felt with intensity II-III in Central California at Mendota, Huron, Los Banos, Clovis, San Juan Bautista, Tulare and Hayward. The last earthquake within about 50 km of this epicenter with M>=4 occurred nearly five years ago on March 27, 2015 with M 4.1. Forecasts 122399 and 122172 had expected activity in this area was likely in late February or early March. Much of the activity in California at this time is located at 101-104 degrees from the M 6.8 in eastern Turkey of January 24, 2020 and may have been promoted from that source.

 

O:  3MAR2020 21:56:40  36.5N  120.6W Md=2.4  EMSC   CENTRAL CALIFORNIA           

O:  3MAR2020 15:01:01  36.5N  120.6W Mw=4.0  EMSC   CENTRAL CALIFORNIA           

P:  7MAR2020 122399    35.7N  121.2W 2.5-4.3 BAAAA  Off So. California         

P: 24FEB2020 122172    36.6N  120.7W 2.5-4.3 CAAAA  Central California         

 

An M 3.6 also occurred today in the region of Northern California northwest of the Geysers. NEIC reported this earthquake of M 3.6 in Northern California  was felt with intensity IV in the area(s) of Northern California at Redwood City, Potter Valley and II-III in Ukiah, Upper Lake, Willits, Comptche, Antelope. A foreshock of M 2.6 was felt with intensity III in Redwood City, Ukiah and Willits.  This may be related to recent enhanced activity in the Geysers or with the extension of the Mendocino Fault Zone inland. The last event of M>=3.6 in the area occurred on April 29, 2019 (M 4.3) and prior to that as an M 3.8 on November 9, 2018. Forecasts 122385 and 122175 had expected this event within about 10 km of the epicenter in late February or early March, 2020.

 

O: 03MAR2020 18:21:32  39.3N  123.1W Mw=3.9  EMSC   NORTHERN CALIFORNIA

O: 03MAR2020 18:24:05  39.3N  123.2W Md=2.0  EMSC   NORTHERN CALIFORNIA

O: 04MAR2020 03:49:21  39.3N  123.2W Md=2.1  EMSC   NORTHERN CALIFORNIA

O:  3MAR2020 18:12:34  39.3N  123.2W Md=2.6  EMSC   NORTHERN CALIFORNIA          

P:  7MAR2020 122385    39.2N  123.1W 2.5-4.5 BAAAA  Central California         

P: 27FEB2020 122175    39.2N  123.1W 2.5-4.4 BAAAA  Central California         

 

MODERATE EARTHQUAKE FELT IN NORTHERN CHILE

 

EARTHQUAKE SUMMARY FOR MARCH 2, 2020

 

It was another quiet day in seismicity. The strongest felt earthquakes occurred in northern Chile with M 5.0. GUC reported this earthquake was felt with intensity   V in  Arica and Parinacota at Arica, Codpa, Cuya; IV in Pocon Chile; III in Putre and II in Alcerreca, Chile. NEIC reported this earthquake of M 4.9-5.0 in Southern Peru  was felt with intensity II-III in the area(s) of Southern Peru at Camana, Arequipa. An event of  M 4.7 in Tarapaca, Chile was felt with intensity III in Tacna, Arica, Tarapaca and Arequipa, Peru. Earlier events of M 4.0 and 4.2 were reported felt lightly in Iquique, Tarapaca, Chile. This is the strongest earthquake in Chile within about 150 km of this epicenter since an M 5.4 on January 24, 2020. Forecast 122496 had expected today's epicenter would likely be active around March 6.

 

O:  2MAR2020 23:07     18.2S   70.4W mb=5.0  GUC    Arica and Parinacota at Arica,

P:  6MAR2020 122496    18.0S   70.0W 4.0-5.3 BAAAA  So. Peru/Bolivia           

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Port Hardy, British Columbia area near Vancouver Island, Canada. It was lightly felt in the epicentral region. Since a series of strong events occurred in the region on December 23 and 25, two events of M>=4.4 have been recorded in this area of British Columbia - an M 4.4 on January 8 and an M 4.6 on February 14, 2020. Forecast 122456 had expected today's event was likely within about 50 km of this epicenter around March 6. This epicenter, like those in Puerto Rico, is located at the fourth node (90 degrees)  from the M 6.8 in eastern Turkey of January 24, 2020 and may have been promoted by energy from that source. It is also at the seventh node (51-52 degrees) from the M 7.7 in Cuba of January 28 and the M 7.0 in the Kuril Islands of February 13.

 

O:  2MAR2020 13:43:22  50.7N  130.0W mb=4.2  EMSC   VANCOUVER ISLAND, CANADA REGIO

O:  2MAR2020 13:43:21  50.4N  130.2W MB=4.4  ECAN Port Hardy, BC                 

P:  6MAR2020 122456    50.9N  130.6W 3.0-4.8 BAAAA  British Colombia           

P: 29FEB2020 122253    52.0N  131.0W 3.0-4.9 ABAAA  British Colombia           

 

A light earthquake of M 3.5 also shook areas of northern Nevada today. This is the strongest earthquake within about 100 km of this epicenter since an M 3.6 northwest of this epicenter on July 8, 2019. This was part of the regional activation associated with the M 7.1 Ridgecrest, California event of July 6, 2019.  Forecast 122218 had expected activity to the west of this in Nevada was likely at the end of February.

 

O:  2MAR2020 12:56:26  40.6N  116.3W ml=3.5  EMSC   NEVADA                       

P: 25FEB2020 122218    40.0N  117.9W 2.5-4.3 BAAAA  California/Nevada area     

P: 25FEB2020 122218    41.3N  118.7W 2.5-4.6 BABAA  California/Nevada area     

 

A series of light earthquakes also occurred along the California-Baja Mexico border today. The strongest of these was an M 3.0. Occasionally swarms such as this in this area can grow into larger events so this is an area to watch. Forecast 122195 had expected today's activity was likely within about 50 km of the epicenter at the end of February or in early March, 2020.

 

NEIC reported these earthquakes of M 3.1 and 2.7  in Southern California  were felt with intensity II-III in the area(s) of Southern California at Heber, El Centro, Calexico and in Temecula and in Mexicali, Baja California.  This activity is at 105 degrees from the region of eastern Turkey where strong seismicity has been occurring and may have been promoted by that activity. It is also at the fifth node (72 degrees) from the M 7.0 in the Kuril Islands of February 13 and may have been promoted from that source.

 

O: 02MAR2020 22:38:05  32.8N  115.5W ML=2.9  EMSC   SOUTHERN CALIFORNIA

O: 02MAR2020 10:59:27  32.8N  115.5W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 02MAR2020 23:03:12  32.8N  115.5W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 02MAR2020 19:07:41  32.8N  115.5W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 02MAR2020 19:37:04  32.8N  115.5W Ml=2.5  EMSC   SOUTHERN CALIFORNIA

O: 02MAR2020 22:33:01  32.9N  115.5W ML=2.5  EMSC   SOUTHERN CALIFORNIA

O:  3MAR2020 02:54:17  32.1N  115.1W ML=3.0  EMSC   BAJA CALIFORNIA, MEXICO      

O:  3MAR2020 02:56:57  32.8N  115.5W ML=2.0  EMSC   SOUTHERN CALIFORNIA          

P: 27FEB2020 122195    32.5N  115.7W 2.5-4.4 BAAAA  So. California             

 

Seismicity was also up in the Puerto Rico and Dominican Republic areas today. An M 3.9 in the aftershock zone of southern Puerto Rico was joined by an M 4.2 in the Dominican Republic. The last earthquake within about 100 km of the  Dominican Republic epicenter with M>=4.3 occurred February 12, 2020 with M 4.3. This event had been anticipated within about 50 km to occur around March 3 (forecast 122361).

 

O:  3MAR2020 03:10:17  18.4N   68.9W mb=4.3  EMSC   DOMINICAN REPUBLIC           

P:  3MAR2020 122361    19.0N   68.0W 3.4-4.8 AAAAA  Puerto Rico                

 

The quake in Puerto Rico continues a long aftershock sequence in the region which began with the M 6.5 on January 7, 2020. It is the strongest aftershock in the southern zone of Puerto Rico since an M 4.3 on February 12, 2020. Forecasts 122360 had expected today's activity was likely around March 4.

 

O: 02MAR2020 21:52:00  17.9N   66.9W ML=3.9  EMSC   PUERTO RICO REGION

P:  4MAR2020 122360    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

 

 

 

MODERATE QUAKE SHAKES WESTERN ANDREANOF ISLANDS, ALEUTIANS

 

EARTHQUAKE SUMMARY FOR MARCH 1, 2020

 

The strongest earthquake in the world today was an M 5.7 in the western Andreanof Islands, Alaska. NEIC reported it was felt with intensity IV in Atka, Alaska. This is part of an aftershock series which follows the M 6.2 on January 23, 2020 and the M 6.1 on January 26, 2020. No aftershocks of M>=5.7 have hit the area since that time. Forecasts 122454 and 122251 had expected today's activity was likely in late February or early March, 2020.

 

O:  2MAR2020 00:31:18  51.2N  179.8W Mw=5.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  4MAR2020 122454    51.7N  179.7W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

P: 27FEB2020 122251    50.9N  179.0W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

While the M 5.7 in the Aleutians was the strongest in the U.S. or Canada today a series of moderate earthquakes of M 4.0-5.0 also occurred in other regions of Alaska. Two of these occurred in the Aleutians as an M 4.8 in the Fox Islands and an M 4.4 in the Unimak Island region; Events of M 4.4 also occurred in the Vancouver Island area of Canada and in Southern Alaska.  The M 4.8 in the Fox Islands was the largest in that area since an M 5.0 on January 13, 2020 and prior to that an M 5.8 on October 26, 2019. Forecast 122252 had expected this event was likely around February 27 within about 100 km of the epicenter.

 

O:  1MAR2020 20:29:41  53.2N  170.4W mb=4.8  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 27FEB2020 122252    52.2N  171.5W 3.5-4.9 BAAAA  Andreanoff Isls, Aleutians 

 

The M 4.4 in the Unimak Island area is the strongest in that area in more than half a year. The last event of larger magnitude in the Unimak Island region was an M 5.1 on February 15, 2019 and prior to that an M 6.0 on December 31, 2018.

Forecast 122265 had expected a moderate earthquake in this area around February 27. This event is at the fifth node (72 degrees) from the M 7.7 south of Cuba of January 28 and may, like similar enhancement in Hawaii, have been promoted by that event.

 

O:  1MAR2020 14:11:11  54.9N  163.1W mb=4.4  EMSC   UNIMAK ISLAND REGION, ALASKA 

P: 27FEB2020 122265    54.1N  164.4W 3.5-4.9 AAAAA  Unimak Islands, Aleutians  

 

The quake in southern Alaska of M 4.4 was the largest within about 100 km of  that epicenter since an M 4.5 on December 1, 2019. The activation of Alaska and the northwest North American Plate at this time is reminiscent of the activation  of early July, 2019 which culminated in the M 7.1 Ridgecrest, California event of July 6, 2019. Forecast 122472 had expected this event within about 25 km of the epicenter was likely around March 5.

 

O:  1MAR2020 20:01:28  60.3N  153.4W mb=4.4  EMSC   SOUTHERN ALASKA              

P:  5MAR2020 122472    60.0N  153.5W 3.2-4.8 BAAAA  Central Alaska             

 

 

An M 4.4 also was recorded today in the Port Hardy, British Columbia area near Vancouver Island, Canada. It was lightly felt in the epicentral region. Since a series of strong events occurred in the region on December 23 and 25, two events of M>=4.4 have been recorded in this area of British Columbia - an M 4.4 on January 8 and an M 4.6 on February 14, 2020. Forecast 122456 had expected today's event was likely within about 50 km of this epicenter around March 6. This epicenter, like those in Puerto Rico, is located at the fourth node (90 degrees) from the M 6.8 in eastern Turkey of January 24, 2020 and may have been promoted by energy from that source. It is also at the seventh node (51-52 degrees) from the M 7.7 in Cuba of January 28 and the M 7.0 in the Kuril Islands of February 13.

 

O:  2MAR2020 13:43:21  50.4N  130.2W MB=4.4  ECAN Port Hardy, BC                 

P:  6MAR2020 122456    50.9N  130.6W 3.0-4.8 BAAAA  British Colombia           

 

MODERATE QUAKES IN YELLOWSTONE; BAFFIN ISLAND

 

EARTHQUAKE SUMMARY FOR FEBRUARY 29, 2020

 

The strongest earthquakes in the U.S. or Canada today occurred in the Baffin Island region of Canada (M 3.9-4.2) and an M 3.9 in West Yellowstone, Montana. NEIC reported the Montana event was felt with intensity II-III in Montana at Cameron, West Yellowstone, Ennis, Virginia City, Gallatin Gateway, Bozeman, Manhattan, and Belgrade, Montana and II in Island Park, Idaho. This is the strongest earthquake in the Yellowstone, Montana area since an M 4.4 on June 16, 2017 and prior to that an M 4.0 on June 13, 2016. Forecast 122248 had expected today's event was likely within about 50 km of this epicenter around February 26. Yellowstone is at the fourth node (90 degrees) from the M 6.8 in Eastern Turkey of January 24, 2020 and may have been promoted from that source.

 

O: 29FEB2020 13:06:32  44.8N  111.5W ML=3.9  EMSC   WESTERN MONTANA              

P: 26FEB2020 122248    44.8N  110.9W 2.0-3.8 BAAAA  Yellowstone/Wyoming         

 

The earthquake of M 3.9 in the Baffin Bay area of eastern Canada in Nunavit was preceded by and M 4.2 foreshock three seconds earlier. These events were not reported felt in this region. The last events of M>=3.9 within about 300 km of this epicenter were an M 4.6 on October 22, 2019 and an M 4.5 on February 9, 2016. Forecast 122281 had expected today's event within about 100 km of these epicenters was likely around February 28. This epicenter is at the sixth node (60 degrees) from the M 6.8 in eastern Turkey of January 24 and at the seventh node (52 degrees) from the M 7.7 south of Cuba of January 28 and may have been promoted from those sources.

 

O: 29FEB2020 20:29:44  72.2N   75.9W MB=3.9  ECAN of Pond Inlet, NU  

O: 29FEB2020 20:29:41  72.1N   75.2W MB=4.2  ECAN OF POND INLET, NU  

O: 29FEB2020 20:29:44  72.2N   75.9W ML=3.9  EMSC   BAFFIN ISLAND REGION, CANADA 

P: 28FEB2020 122281    73.3N   73.5W 2.5-3.8 ABAAA  Baffin/Davis Strait Canada 

 

This activity may also have been promoted by an increase in the disturbance levels in the geomagnetic field today as noted in this summary:

 

“The geomagnetic field saw disturbed conditions today. The AP level was 11.  High latitude geomagnetic field also saw disturbed conditions  with AP at 17. Moderate disturbance in the geomagnetic field after periods of quiet can help promote seismicity at high latitudes and near the geomagnetic equator.” (February 29, 2020)

 

 

It was a quiet day in global seismicity. The largest, and only, event of M>=5 today was an M 5.2 in the area north of Halmahera, Indonesia. This may have been related to the recent new moon as it occurred near the longitude of maximum stress with that tidal alignment as noted in the previous issues of this summary:

 

 

"The New Moon  arrived on February 23, 2020 at 15:32 UT. Longitudes which were sub-solar at this time are near 52 West while those antisolar are at 128 East longitude. These include areas of the Central Atlantic such as Puerto Rico and the South Sandwich Islands in the west and central Indonesia, the Philippines and Japan in the east. A strong tidally enhanced earthquake is possible in the next six days. Other tidal enhancement would promote larger quakes near local solar noon and midnight. Many other areas of the earth can also see tidal enhancement of seismicity at this time." (February 22-25, 2020)

 

Today's event is at 144 degrees from the M 7.7 south of Cuba of January 28 and may have been promoted by energy from that source as well. Forecast 122103 had expected today's event in Halmahera was lokely around February 26.

 

O: 29FEB2020 09:28:26   3.2N  128.2E Mw=5.2  EMSC   NORTH OF HALMAHERA, INDONESIA

P: 26FEB2020 122103     1.0N  128.0E 4.0-5.4 BCAAA  Halmahera                  

 

MODERATE EARTHQUAKE SHAKES MADEIRA ISLANDS, PORTUGAL

 

EARTHQUAKE SUMMARY FOR FEBRUARY 28, 2020

 

An unusually large M 4.8 earthquake was felt in the Madeira Islands of Portugal today. The last such earthquake in the Madeira Island area was an M 4.8 on August 15, 2007, but today's event is the strongest within about 300 km of this epicenter in at least 30 years. Other events of M 4.8-5.0 about 300 km to the northeast of this occurred in 2006, 2005 and 1990. This may be related to regional volcanism. Forecast 122185 had expected today's event was likely to the northeast around February 26.

 

O: 29FEB2020 04:04:00  35.1N   14.7W ML=3.0  EMSC   AZORES-CAPE ST. VINCENT RIDGE

O: 29FEB2020 04:06:18  35.7N   15.0W ML=3.0  EMSC   AZORES-CAPE ST. VINCENT RIDGE

O: 29FEB2020 03:05:25  35.0N   14.7W mb=4.8  EMSC   MADEIRA ISLANDS, PORTUGAL REGI

P: 26FEB2020 122185    37.0N   11.0W 3.5-4.8 BBBAA  Morocco/Spain              

 

The strongest earthquakes in the world today occurred in the southwestern Pacific. An M 5.3 in Tonga was joined by an M 5.1 south of the Loyalty Islands.

This continues activation of the area which has been ongoing for several days

and may be related to the passage of Tropical Cyclone Wasi through the area as noted in previous issues of this summary:

 

"Tropical cyclone Wasi (18P) continued today in the area of Samoa with winds up to 50 kts. Stresses from this storm may enhance regional seismicity in Samoa and northern Tonga over the next four days with a moderate to strong regional quake possible in this time frame." (February 20-22, 2020)

 

O: 29FEB2020 01:57:10  19.5S  173.0W mb=5.3  EMSC   TONGA                        

P: 24FEB2020 122293    19.0S  173.0W 4.0-5.3 BAAAA  Tonga Islands              

 

O: 29FEB2020 06:43:46  22.0S  169.1E Mw=5.1  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 24FEB2020 122298    22.0S  170.0E 4.0-5.3 BAAAA  Loyalty Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in the region near Tofino, British Columbia and the Vancouver Island area. It was not reported felt in this epicentral region. This is the largest earthquake within about 100 km of this epicenter reported by NEIC since an M 4.1 on December 1, 2019 and an M 4.7 on December 9, 2018. Forecast 122246 had expected today's event around February 25.

 

O: 28FEB2020 05:03:18  47.7N  129.6W MB=3.8  ECAN Tofino, BC                     

P: 25FEB2020 122246    48.9N  129.3W 2.8-4.9 BBAAA  Vancouver Island area      

 

A moderate earthquake also occurred today as an M 3.7 in Hawaii. NEIC reported intesntiy IV in Hawaii at Naalehu and II in Pahala, Captain Cook, Holualoa and Kailua Kona. The last earthquake in Hawaii with M>=3.7 occurred on February 3, 2020 with M 4.2 and before that as an M 4.9 on November 11, 2019.  Forecast 122134 had expected this activity was likely around February 25.

 

O: 28FEB2020 11:01:53  19.2N  155.7W ML=3.7  EMSC   ISLAND OF HAWAII, HAWAII     

P: 25FEB2020 122134    19.9N  155.1W 3.0-4.3 BAAAA  Hawaii                     

 

ENHANCED SEISMICITY IN SOUTHERN OCEANS

 

EARTHQUAKE SUMMARY FOR FEBRUARY 27, 2020

 

The strongest activity in the world today occurred in the southern Oceans. It included events of M 5.2 on the Southern East Pacific Rise; M 5.3 in the Southern Mid-Atlantic and the strongest quake of the day - an M 5.8 in Tonga. The earthquake in Tonga was the strongest within about 200 km of this epicenter since an M 6.1 on November 11, 2019. Forecast 122293 had expected this event within about 100 km was likely around February 24. EMSC and NEIC reported epicenters differing by about 150 km for this event, an unusually large discrepancy.

 

The event may also have been promoted by stresses associated with Tropical Cyclone Wasi which recently passed over this epicenter as described in previous issues of this summary:

 

"Tropical cyclone Wasi (18P) continued today in the area of Samoa with winds up to 50 kts. Stresses from this storm may enhance regional seismicity in Samoa and northern Tonga over the next four days with a moderate to strong regional quake possible in this time frame." (February 20-22, 2020)

 

This epicenter is also located at 145 degrees from the M 6.8 in Eastern Turkey of January 24 and was probably promoted by energy from that source.

 

O: 28FEB2020 07:42:11  19.5S  173.9W Mw=5.8  EMSC   TONGA                        

O: 28FEB2020 07:41:50  18.9S  172.9W Mw=5.8  ANSS   TONGA                        

P: 24FEB2020 122293    19.0S  173.0W 4.0-5.3 BAAAA  Tonga Islands              

 

Among the moderate events in the South Pacific today was an M 5.2 on the Southern East Pacific Rise. It was not reported felt in this remote area. The last earthquake within about 300 km of this epicenter with M>=5.2 occurred November 15, 2018 with M 6.3 about 300 km south west of today's epicenter and before that as an M 5.4 on June 30, 2019 within about 100 km of today's epicenter. Forecast 112318 had expected today's activity within this region was likely around February 29.

 

O: 27FEB2020 22:20:35  54.6S  118.8W mb=5.2  EMSC   SOUTHERN EAST PACIFIC RISE   

P: 29FEB2020 122318    50.0S  116.0W 4.0-5.3 ACBAA  East Pacific Rise          

P: 29FEB2020 122318    56.0S  122.0W 4.0-5.4 ABBAA  Pacific-Antarctic Ridge    

 

A moderate M 5.3 also occurred in the Southern Mid-Atlantic Ridge today. This is an aftershock of the M 5.1 which was located at this epicenter yesterday. This summary noted this event in the previous issue as:

 

 

"The strongest earthquake in the world today was an M 5.1 in the southern Mid-Atlantic Ridge. It was not reported felt in this remote area. The last earthquakes of equal of larger magnitude within about 250 km of today's epicenter occurred on January 17, 2020 (M 5.9) and June 1, 2019 (M 5.4). Forecast 122289 had expected today's earthquake was likely within about 100 km in late February. This earthquake is at 144 degrees from the M 7.0 in the Kuril Islands of February 13 and may have been promoted by energy from that source.  It is also at the fifth node (72 degrees) from the M 7.7 south of Cuba of January 28 and the M 6.8 in eastern Turkey of January 24, 2020 and may have been enhanced from that source." (February 26-27, 2020)

 

O: 27FEB2020 15:18:18  13.8S   14.6W mb=5.3  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P: 22FEB2020 122289    13.0S   15.0W 4.0-5.4 BAAAA  So. Mid-Atlantic Ridge     

P: 29FEB2020 122289    14.0S   14.0W 4.0-5.4 AAAAA  So. Mid-Atlantic Ridge     

 

The second strongest earthquake of the day was an M 5.6 in the region of Halmahera, Indonesia. It occurred near the maximum tide line of the recent new moon and may have been promoted by energy associated with that event as noted in previous issues:

 

"The New Moon  arrived on February 23, 2020 at 15:32 UT. Longitudes which were sub-solar at this time are near 52 West while those antisolar are at 128 East longitude. These include areas of the Central Atlantic such as Puerto Rico and the South Sandwich Islands in the west and central Indonesia, the Philippines and Japan in the east. A strong tidally enhanced earthquake is possible in the next six days. Other tidal enhancement would promote larger quakes near local solar noon and midnight. Many other areas of the earth can also see tidal enhancement of seismicity at this time." (February 22-25, 2020)

 

Forecast 122103 had expected this activity in Halmahera was likely at the end of February within about 100 km of today's epicenter.

 

O: 27FEB2020 19:13:02   3.9N  125.8E Mw=5.6  EMSC   KEPULAUAN SANGIHE, INDONESIA 

P: 23FEB2020 122103     4.0N  127.0E 4.0-5.3 BAAAA  Halmahera                  

 

Elevated seismicity also continued in areas near eastern Turkey and Greece today with an M 4.7 in the Dodecanese Islands of Greece and an M 4.6 offshore Azerbaijan in the Caspian Sea. Like much of the recent activity in the region, the M 4.6 in the Caspian Sea is located at 104 degrees from the M 7.7 south of Cuba which occurred a month ago on January 28. Energy from that source is likely to have helped promote today's Caspian Sea quake. Forecasts 122211 and 122007 had expected this activity in Greece and the Caspian Sea was likely at the end of February.

 

The Dodecanese activity is aftershocks of the M 5.6 and 5.7 which hit the region on January 30, 2020.

 

O: 27FEB2020 12:20:19  35.1N   28.0E ML=4.0  EMSC   DODECANESE ISLANDS, GREECE   

O: 27FEB2020 14:36:15  35.1N   28.0E mb=4.7  EMSC   DODECANESE ISLANDS, GREECE   

P: 28FEB2020 122211    34.0N   29.0E 3.5-5.1 ABAAA  Turkey                     

 

The M 4.6 in the Caspian Sea is the strongest aftershock to date of the M 4.7 which shook the area on February 15.

 

O: 27FEB2020 10:17:37  39.9N   51.5E mb=4.6  EMSC   CASPIAN SEA, OFFSHORE AZERBAIJ

P: 21FEB2020 122007    40.0N   50.0E 4.0-5.3 CABAA  Kazakhstan                 

 

The strongest earthquake in the U.S. or Canada today was an M 3.9-4.2 in the Kenai Peninsula, Alaska. NEIC reported maximum intensity IV in Soldotna and II-III in Sterling, Kasilof, Kenai, Clam Gulch, Cooper Landing Ninilchik, and Anchorage. This is the largest earthquake in the Kenai Peninsula in at least half a year but the last within about 100 km of this epicenter with M>=4.2 was an M 4.2 on May 10, 2019 and an M 4.7 on July 3, 2019 during the regional activation leading to the M 7.1 Ridgecrest, California event of early July, 2019. Forecast 122268 had expected today's quake within this area was likely around February 26.

 

O: 27FEB2020 10:13:23  60.5N  150.8W ML=4.2  EMSC   KENAI PENINSULA, ALASKA      

P: 26FEB2020 122268    60.2N  151.7W 3.2-4.8 AAAAA  Central Alaska             

 

MODERATE EARTHQUAKE IN SOUTHERN  MID-ATLANTIC RIDGE

 

EARTHQUAKE SUMMARY FOR FEBRUARY 26, 2020

 

The strongest earthquake in the world today was an M 5.1 in the southern Mid-Atlantic Ridge. It was not reported felt in this remote area. The last earthquakes of equal of larger magnitude within about 250 km of today's epicenter occurred on January 17, 2020 (M 5.9) and June 1, 2019 (M 5.4). Forecast 122289 had expected today's earthquake was likely within about 100 km in late February. This earthquake is at 144 degrees from the M 7.0 in the Kuril Islands of February 13 and may have been promoted by energy from that source.  It is also at the fifth node (72 degrees) from the M 7.7 south of Cuba of January 28 and the M 6.8 in eastern Turkey of January 24, 2020 and may have been enhanced from that source.

 

O: 27FEB2020 04:11:10  12.3S   14.8W mb=5.1  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P: 22FEB2020 122289    13.0S   15.0W 4.0-5.4 BAAAA  So. Mid-Atlantic Ridge     

P: 29FEB2020 122289    14.0S   14.0W 4.0-5.4 ABAAA  So. Mid-Atlantic Ridge     

 

Moderate seismicity continued in Turkey and Greece today with events of M 4.5 in the Dodecanese Islands of Greece and M 4.6 in eastern Turkey. This activity continues regional events over the past several days, possibly related to distance triggering from the M 7.7 south of Cuba of January 28 which is near 103 degrees and 90 degrees from many of these events. Forecasts 122180 and 121995 had expected this activity in later February.

 

NEIC reported the earthquake of M 4.6 in  Turkey was felt with intensity II-III in the area(s) of Turkey at Malatya.

 

O: 26FEB2020 14:20:12  35.1N   27.9E mb=4.5  EMSC   DODECANESE ISLANDS, GREECE   

P: 29FEB2020 122180    34.0N   27.0E 3.0-4.3 BBAAA  Crete                      

 

O: 27FEB2020 02:08:45  38.3N   38.7E mb=4.6  EMSC   EASTERN TURKEY               

P: 18FEB2020 121995    39.0N   40.0E 3.5-4.8 CAAAA  Turkey                     

 

An earthquake of M 5.0 also occurred today in India in the Himachal Pradesh area. NEIC reported this earthquake of M 5.0 on the Kashmir-India border   was felt with intensity II-III in the area(s) of the Kashmir-India border Chamba, Udhampur, Gurdaspur, Banjar, Jalandhar, Amritsar, Phagwara, Uri Jammu, and Lahore, Pakistan. This is the strongest seismic event within about 200 km of this epicenter since an M 5.6 on September 24, 2019.  Forecast 122192 had expected this event was possible around February 24.

 

O: 26FEB2020 15:04:08  33.0N   76.3E mb=5.0  EMSC   HIMACHAL PRADESH, INDIA      

P: 24FEB2020 122192    35.0N   78.0E 3.8-5.1 ABBAA  Northern India             

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in the Geysers of California. NEIC reported this earthquake of M 3.7 in the Geysers, California  was felt with intensity II-III in the area(s) of the Geysers, California at Kelseyville, Geyserville, Lower Lake, Clearlake, Hopland, Calistoga, Windsor and Santa Rosa. An M 2.8 three minutes earlier was felt with intensity IV in Kelseyville. This is the strongest earthquake in this region within about 50 km of this epicenter since an M 4.2 on November 3, 2019 and prior to that an M 4.1 on June 11, 2019. Forecast 122174 had expected today's activity in the Geysers was likely at the end of February. It occurred near local solar noon and may have been promoted by tidal stresses which often influence this water-rich area. It may also have been enhanced by energy from eastern Turkey. It is at 101 degrees from the M 6.8 there of January 24.

 

O: 26FEB2020 18:34:13  38.8N  122.8W ML=3.2  EMSC   NORTHERN CALIFORNIA

O: 26FEB2020 18:34:13  38.8N  122.8W ML=3.7  ANSS   NORTHERN CALIFORNIA

O: 26FEB2020 12:28:45  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 26FEB2020 18:36:03  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 26FEB2020 19:06:01  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 26FEB2020 12:30:07  38.8N  122.8W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 26FEB2020 18:31:33  38.9N  122.8W ML=2.6  EMSC   NORTHERN CALIFORNIA

O: 26FEB2020 21:46:18  38.6N  122.3W Md=2.0  EMSC   NORTHERN CALIFORNIA          

P: 25FEB2020 122174    38.7N  122.7W 2.5-4.6 AAAAA  Central California         

P: 29FEB2020 122174    38.5N  122.7W 2.5-4.5 BAAAA  Central California         

 

 

STRONG QUAKE IN BANDA SEA FELT IN NORTHERN TERRITORY, AUSTRALIA

 

EARTHQUAKE SUMMARY FOR FEBRUARY 25, 2020

 

EMSC reported this earthquake was felt with light intensity in northwestern Australia and Darwin and Coolalinga. NEIC added Humpty Doo-MacMinns Lagoon, Nguiu, Palmerston and Howard Springs, Northern Territory, Australia to sites feeling this earthquake with intensity II-III. Strong earthquakes in the Banda Sea are often felt in northern Australia due to the depth of these events and the cone of felt effects. This earthquake in the Banda Sea is the strongest within about 200 km of this epicenter since an M 5.9 on September 21, 2019 with the largest of greater magnitude in the area an M 7.3 on June 24, 2019 about 250 km to the northwest of today's epicenter. Forecast 122125 had expected today's event was likely within about 100 km around February 27. This event may also have been promoted by high tidal stresses associated with the new moon of February 26 as it occurred near the longitude where these were maximized as noted in previous issues of this summary:

 

"The New Moon  arrived on February 23, 2020 at 15:32 UT. Longitudes which were sub-solar at this time are near 52 West while those antisolar are at 128 East longitude. These include areas of the Central Atlantic such as Puerto Rico and the South Sandwich Islands in the west and central Indonesia, the Philippines and Japan in the east. A strong tidally enhanced earthquake is possible in the next six days. Other tidal enhancement would promote larger quakes near local solar noon and midnight. Many other areas of the earth can also see tidal enhancement of seismicity at this time." (February 22-25, 2020)

 

O: 26FEB2020 07:33:11   7.6S  131.2E Mw=5.9  EMSC   KEP. TANIMBAR REGION, INDONESI

P: 27FEB2020 122125     7.0S  130.0E 4.0-5.3 AAAAA  West Irian, PNG            

 

Seismicity in eastern Turkey to Kazakhstan continued at an elevated level today. This include an M 5.0 in Western Kazakhstan; an M 5.0 in eastern Turkey and continuing aftershocks of M 4.4 and 4.2 in the region of the Turkey-Iran border. The M 5.0 earthquake was felt today in the region of Eastern Turkey. This is an aftershock of the M 6.8 of January 24 in the area but not an aftershock of the recent M 6.0 to the southeast of this two days ago. It was felt with maximum intensity IV in Malatya, Yesilyurt, Elazig, Diyarbalir, Ebistan and Gaziantep, Turkey. This earthquake is at 103 degrees from the M 7.7 south of Cuba of January 28 and, like much of the regional activity in the past several weeks, have been promoted by energy from that source. Forecast 122007 had expected a moderate earthquake in Kazakhstan around February 21.

 

O: 26FEB2020 07:51:26  41.8N   52.1E mb=5.0  EMSC   WESTERN KAZAKHSTAN           

P: 21FEB2020 122007    40.0N   50.0E 4.0-5.3 BBBAA  Kazakhstan                 

 

The events in eastern Turkey were aftershocks of strong regional earthquakes of the past month and had been expected at this time in forecasts 121995 and 122219.

 

O: 25FEB2020 23:03:38  38.3N   38.8E mb=5.0  EMSC   EASTERN TURKEY               

P: 18FEB2020 121995    39.0N   40.0E 3.5-4.8 CAAAA  Turkey                     

 

O: 25FEB2020 22:28:15  38.4N   44.4E mb=4.4  EMSC   TURKEY-IRAN BORDER REGION    

O: 25FEB2020 14:14:02  38.4N   44.5E mb=4.5  EMSC   TURKEY-IRAN BORDER REGION    

P: 24FEB2020 122219    39.0N   44.0E 3.5-4.8 AAAAA  Caucasus/Caspian Sea       

 

An unusual earthquake was recorded in Namibia, southern Africa today with  M 3.1. This epicenter is at 102 degrees from the M 7.7 south of Cuba of January 28 and may have been promoted by energy from that source. The last earthquake within about 300 km of this epicenter in Namibia of M>=3.1 was an M 4.1 on May 24, 2010, the only such event in this area in the past 30 years.

 

 

O: 25FEB2020 15:23:57  26.7S   15.1E ML=3.1  EMSC   NAMIBIA                      

 

QUAKES FELT IN SOUTHERN ITALY AND NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR FEBRUARY 24, 2020

 

An M 4.6-4.8 quake was felt today in the region of Southern Italy. NEIC reported maximum intensity VII in Rende, Calabria and VI in Cosenza and Milazzo, Sicily and possibly in Bologna, more than 600 km north of the epicenter. The M 4.8 was preceded by an M 3.4 to the west of it about 6 minutes before. This is the strongest earthquake in southern Italy within about 100 km of this epicenter since an M 4.9 on April 5, 2014. The last of M>=4.6 was an M 4.6 on October 25, 2019 to the east of today's epicenter. Forecast 122183 had expected this activity was likely around February 26.

 

O: 24FEB2020 16:02:58  39.3N   16.2E ML=4.6  EMSC   SOUTHERN ITALY               

O: 24FEB2020 15:56:54  39.4N   15.1E ML=3.4  EMSC   SOUTHERN ITALY               

P: 26FEB2020 122183    38.0N   15.0E 3.0-4.4 ABAAA  Mediterranean/Sicily       

 

An earthquake of M 4.8-5.5 occurred today in the South Island of New Zealand.

GEONET reported 375 people felt this quake with 284 with weak intensity; 88 with light intensity and 3 with moderate intensity. None  reported strong shaking and 0 extreme intensity. NEIC reported this earthquake of M 4.8-5.5 in South Island, New Zealand  was felt with intensity II-III in the area(s) of South Island, New Zealand at Te Anau, Queenstown and Wanaka, Otago. The last quake within about 200 km of this epicenter with M>=5.5 occurred on May 15, 2015 with M 5.6 and prior to that as an M 6.1 on August 5, 2009. Forecast 122315 had expected today's event within about 100 km was likely around February 29. This epicenter is at the third node (120 degrees) from the M 7.7 South of Cuba of January 28. An earthquake in the Bonin Islands of M 4.8 today was also at this distance from Cuba.

 

O: 24FEB2020 10:14:22  44.7S  167.4E mb=4.8  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 24FEB2020 10:14:22  44.7S  167.5E ML=5.5  GEONET reported 375 people felt this quake

P: 29FEB2020 122315    44.0S  169.0E 3.0-4.8 BAAAA  So. Island, N.Z.            

 

The strongest earthquake reported by NEIC or EMSC today was an M 5.2 in the region of Fiji. This event may have been enhanced by Tropical cyclone Wasi as previously noted in this summary as:

 

"Tropical cyclone Wasi (18P) continued today in the area of Samoa with winds up to 50 kts. Stresses from this storm may enhance regional seismicity in Samoa and northern Tonga over the next four days with a moderate to strong regional quake possible in this time frame." (February 20-22, 2020)

 

This earthquake, like those in Eastern Europe and the Kuril Islands is located at 103 degrees from the M 7.7 south of Cuba of January 28. These are the only active seismic zones at this distance from that event and may continue to see enhanced seismicity in coming days.

 

O: 25FEB2020 02:07:28  17.7S  178.9W mb=5.2  EMSC   FIJI REGION                  

P: 28FEB2020 122294    19.0S  178.0W 4.0-5.4 BBAAA  Tonga Islands              

 

SECOND STRONG EARTHQUAKE ON IRAN-TURKEY BORDER

 

EARTHQUAKE SUMMARY FOR FEBRUARY 23, 2020

 

The strongest earthquake in the world today was an M 6.0 on the Turkey-Iran border in eastern Turkey. It is a co-mainshock with the M 5.7 which hit the area yesterday. Today's event was reported by NEIC to have been felt with maximum intensity VII in Azerbaijan and Iran at Dilman; IV in Iran at Orumiyeh, Tebriz and II-II in Merand, Yerevan, Armenia, Arbil, Iraq and in Sarband and Tehran, Iran. When the M 5.7 occurred earlier this summary noted in the previous issue:

 

"The strongest earthquake in the world today was an M 5.7 in eastern Turkey near the Iran border. NEIC reported it was felt with intensity VII in Ozalp, Van, Turkey and in Iran at Khoi Azarbayenj-e, Gharbi and Orunmiyeh, Azarbaijan. This is the strongest earthquake in the region within about 200 km of this epicenter since an M 6.4 on August 11, 2012. Today's event was probably promoted by the new moon today as it occurred near local solar noon at the epicenter. Forecasts 122002 and 122219 had expected this activity within about 100 km was likely around February 21-24. This epicenter is located at 102 degrees from the M 7.7 south of Cuba of January 28, 2020 and was probably promoted by energy from that source." (February 22-23, 2020)

 

Following the earthquake in Cuba of January 28, 2020 this summary had noted that strong seismicity in the region of eastern Turkey and the Kuril Islands was likely as triggered seismicity as:

 

"The earthquake near Cuba may reset global seismicity as it is the strongest in nearly a year in the world. Far-field triggering is most likely in eastern Turkey, Iran/Iraq and the east African Rift valley as well as in Hokkaido and northern Japan (103 degrees)" (January 29, 2020; repeated following the M 7.0 in the Kuril Islands on February 13-14, 2020)

 

and

 

"A major earthquake of M 6.9-7.0 shook regions of the Kuril Islands today. NEIC reported maximum intensity V in Hokkaido and IV in Sakhalin, Russia. Intensity II-IV was reported from areas of Hokkaido within about 500 km of the epicenter.

This epicenter is at 102-103 degrees from the M 7.7 south of Cuba on January 28, and the first major quake in the world since that time. Seismic energy from large earthquakes concentrates at the surface around 102-103 degrees from the mainshock epicenter after reflection and refraction off inner earth boundaries." (February 13-14, 2020)

 

This area of Turkey-Iran border first became active on February 16, 2020 with an M 4.8 foreshock. The last earthquake within about 200 km of today's M 6.0 with equal or larger magnitude occurred on August 11, 2012 with M 6.3 and 6.4 about 200 km east of today's epicenter. The only other such event in the region in the past 30 years was an M 7.1-7.3 on October 23, 2011. Forecast 122219 had expected today's activity was likely around February 24. Today's activity is at 102-103 degrees from both the M 7.1 in Central California of July 6, 2019 and from the M 7.7 south of Cuba of January 28, 2020. It is also at the fifth node (72 degrees) from the M 7.0 in the Kuril Islands of February 13 and may have been promoted by energy from these events.

 

O: 23FEB2020 10:25:40  38.4N   44.4E mb=4.1  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 16:56:21  38.4N   44.5E ML=4.0  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 17:00:40  38.4N   44.5E ML=4.0  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 20:44:36  38.4N   44.5E ML=4.0  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 16:37:50  38.4N   44.5E mb=4.2  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 14:28:39  38.4N   44.5E mb=4.3  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 16:00:29  38.4N   44.6E Mw=6.0  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 16:39:57  38.5N   44.5E mb=4.1  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 09:48:21  38.5N   44.5E mb=4.4  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 16:54:37  38.5N   44.5E mb=4.5  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 16:20:19  38.4N   44.4E mb=4.0  EMSC   TURKEY-IRAN BORDER REGION    

P: 24FEB2020 122219    39.0N   44.0E 3.5-4.8 AAAAA  Caucasus/Caspian Sea       

 

Moderate earthquakes of M 4.7 and M 4.8 also continued in western Turkey today.

NEIC reported this earthquake of M 4.6 in Western Turkey  was felt with intensity II-III in the area(s) of Western Turkey at Izmir, Buyukorhan, Bursa and Mudanya. A smaller M 4.4 earlier in the day was felt with intensity IV in Akhisar and II in Izmir. These appear to be aftershocks of an M 5.6 at this epicenter on January 22, 2020. The last similar aftershock was an M 4.8 on February 18. Forecast 12221 had expected today's activity was likely around February 24.

 

O: 23FEB2020 12:40:18  39.0N   27.9E ML=4.8  EMSC   WESTERN TURKEY

O: 24FEB2020 02:43:33  39.0N   27.9E mb=4.7  EMSC   WESTERN TURKEY               

P: 24FEB2020 122211    37.0N   28.0E 3.5-5.0 ABAAA  Turkey                     

 

The second strongest earthquake in the world today was an M 5.2 in the Kuril Islands. This is the strongest aftershock to date of the M 7.0 in the area which occurred February 13. It joined a series of moderate quakes in the region of eastern Japan today. Forecast 122243 had expected today's event was likely around February 24. As noted above this epicenter is also at 102-103 degrees from the M 7.7 south of Cuba of January 28.

 

O: 23FEB2020 12:57:08  45.7N  148.4E mb=5.2  EMSC   KURIL ISLANDS                

P: 24FEB2020 122243    45.0N  149.0E 3.5-5.4 AAAAA  So. Kurils                 

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in the Kenai Peninsula, Alaska. NEIC reported this earthquake of M 3.5 in the Kenai Peninsula, Alaska  was felt with intensity II-III in the area(s) of the Kenai Peninsula, Alaska at Kenai, Sterling, Soldotna, Anchorage and Wasilla.  The last event in the Kenai Peninsula of M>=3.7 was an M 3.7 on February 7, 2020 about  200 km southeast of today's epicenter. Forecast 122268 had expected today's earthquake within about 50 km was likely around February 26.

 

 

O: 23FEB2020 16:15:42  60.9N  151.2W ML=3.7  EMSC   KENAI PENINSULA, ALASKA      

P: 26FEB2020 122268    60.2N  151.7W 3.2-4.8 BAAAA  Central Alaska             

MODERATELY STRONG QUAKE SHAKES EASTERN TURKEY-IRAN BORDER

 

EARTHQUAKE SUMMARY FOR FEBRUARY 22, 2020

 

The strongest earthquake in the world today was an M 5.7 in eastern Turkey near the Iran border. NEIC reported it was felt with intensity VII in Ozalp, Van, Turkey and in Iran at Khoi Azarbayenj-e, Gharbi and Orunmiyeh, Azarbaijan.

This is the strongest earthquake in the region within about 200 km of this epicenter since an M 6.4 on August 11, 2012. Today's event was probably promoted by the new moon today as it occurred near local solar noon at the epicenter. Forecasts 122002 and 122219 had expected this activity within about 100 km was likely around February 21-24. This epicenter is located at 102 degrees from the M 7.7 south of Cuba of January 28, 2020 and was probably promoted by energy from that source.

 

O: 23FEB2020 05:52:58  38.4N   44.5E Mw=5.7  EMSC   TURKEY-IRAN BORDER REGION    

P: 21FEB2020 122002    40.0N   44.0E 3.5-4.8 ABAAA  Caucasus/Caspian Sea       

P: 24FEB2020 122219    39.0N   44.0E 3.5-4.8 AAAAA  Caucasus/Caspian Sea       

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 off the coast of Northern California. NEIC reported it was felt with intensity II-III in California at Petrolia, Ferndale, Rio Dell, Fortuna, Eureka, Whitethorn, Carlotta, Myers Flat and Redway. This event may have been promoted by the new moon as it occurred within half an hour of local solar noon. The new moon arrived today as noted in previous issues of this summary:

 

"The New Moon will arrive on February 23, 2020 at 15:32 UT. Longitudes which are sub-solar at this time are near 52 West while those antisolar are at 128 East longitude. These include areas of the Central Atlantic such as Puerto Rico and the South Sandwich Islands in the west and central Indonesia, the Philippines and Japan in the east. A strong tidally enhanced earthquake is possible in the next six days. Other tidal enhancement would promote larger quakes near local solar noon and midnight. Many other areas of the earth can also see tidal enhancement of seismicity at this time." (February 21-22, 2020)

 

This event is the strongest within about 100 km of this epicenter since an M 5.2 on October 28, 2019 and prior to that an M 5.6 on June 23, 2019 in the regional activation of June and early July 2019. Forecast 122235 had expected today's event within about 25 km of this epicenter was likely around February 23. This epicenter is at the sixth node (60 degrees) from the M 7.0 in the Kuril Islands of February 13, 2020 and was probably promoted by energy from that epicente

 

O: 22FEB2020 19:14:24  40.3N  125.0W Mw=4.4  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 23FEB2020 122235    40.6N  124.9W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

A series of moderate earthquakes occurred today in the West Chile Rise. The largest of these as of M 5.5 and M 5.1. They were not reported felt in this remote area. The M 5.5 is the strongest within about 200 km of this epicenter since an M 5.9 on May 6, 2014. Forecast 122085 and 122312 had expected moderate activity southeast of these epicenters was likely around February 21-23.  This activity is at 144 degrees from the M 6.8 of January 24, 2020 in eastern

Turkey and may have been enhanced by energy from that source. It is also at the sixth node (60 degrees) from the M 7.7 south of Cuba of January 28, 2020.

 

O: 22FEB2020 23:12:36  38.1S   93.7W Mw=5.5  EMSC   WEST CHILE RISE

O: 22FEB2020 23:19:02  38.3S   93.9W mb=5.1  EMSC   WEST CHILE RISE

O: 22FEB2020 14:44:40  38.8S   92.3W mb=4.3  EMSC   WEST CHILE RISE

O: 23FEB2020 01:40:33  37.9S   92.2W mb=4.3  EMSC   WEST CHILE RISE              

P: 21FEB2020 122085    41.0S   88.0W 4.0-5.3 ACCAA  Chile Rise                 

P: 23FEB2020 122312    41.0S   88.0W 4.0-5.3 ACCAA  Chile Rise                 

 

Seismicity was also up in the Southwest Pacific today where the second strongest earthquake of the day - an M 5.6 and 5.2 occurred in central Tonga. These were not reported felt in this area. They were probably enhanced or promoted by  Tropical cyclone Wasi which was passing through the area at the time of these events. This had been expected in previous issues of this summary as:

 

"Tropical cyclone Wasi (18P) continued today in the area of Samoa with winds up to 50 kts. Stresses from this storm may enhance regional seismicity in Samoa and northern Tonga over the next four days with a moderate to strong regional quake possible in this time frame." (February 20-22, 2020)

 

The M 5.6 is the strongest earthquake within about 200 km of this epicenter in  Tonga since an M 6.1 on June 15, 2019. Most activity at this magnitude level in the past three years has occurred north of today's epicenter. Forecast 122075 had expected today's event within about 50 km was likely around February 19. This activity is at 146 degrees from the M 6.8 of January 24, 2020 in eastern  Turkey and may have been enhanced by energy from that source. Also, like the event in eastern Turkey today this activity is located at 102 degrees from the M 7.7 south of Cuba of January 28, 2020 and was probably promoted by energy from that source.

 

O: 22FEB2020 18:50:22  21.7S  174.3W mb=5.2  EMSC   TONGA                        

O: 22FEB2020 19:46:14  22.3S  174.8W Mw=5.6  EMSC   TONGA REGION                 

P: 19FEB2020 122075    22.0S  175.0W 4.0-5.3 BAAAA  Tonga Islands              

 

O: 22FEB2020 10:34:05  15.1S  177.3W mb=4.1  EMSC   FIJI REGION                  

P: 23FEB2020 122288    15.0S  176.0W 4.0-5.6 AAAAA  Samoa Islands              

 

UNUSUAL SEISMICITY IN SOUTHERN; BAJA CALIFORNIA

 

EARTHQUAKE SUMMARY FOR FEBRUARY 21, 2020

 

A light to moderate earthquake shook the valleys west of Los Angeles today. NEIC reported this event of M 3.5-3.9 was felt with intensity II-III in Castaic, Valencia, Santa Clarita, Stevenson Ranch, Canyon County, Lake Hughes, Newhall, Los Angeles, Northridge, San Fernando and in general within about 100 km of the epicenter.

 

This activity had been expected at this time as reported in the previous issue of this summary:

 

 

"The strongest earthquake felt in the U.S. or Canada outside Alaska today was an M 3.2-3.3 in the Ridgecrest area of Southern California. NEIC reported it was felt with intensity II-III in Ridgecrest and Wofford Heights, California.

Some evidence suggests that Southern California, and especially the valleys west of Los Angeles, may see enhanced seismicity at this time. When an M 6.0 in New Guinea at 103 degrees from Southern California occurred this summary suggested:

 

"The strongest earthquake in the world today was an M 6.0-6.1 in northern New Guinea. NEIC reported it was felt with intensity IV in Aberpura, Papua New Guinea, Indonesia. Strong earthquakes in this area can affect seismicity in the Los Angeles area of California as it is located at 103 degrees from this. Major quakes in New Guinea are often followed by moderate to strong quakes in southern California about a month later. Major quakes in California often occur in January and February (for example San Fernando - February 9, 1971 and Northridge - January 16, 1994). Today's event is not large enough to trigger this large an event but may be precursory to larger regional events in New Guinea." (January 19, 2020)

 

When an M 4.5 on the Kansas-Nebraska border followed the next day this summary followed up on this with:

 

"While this appears to be part of the general increased seismicity in Oklahoma and Kansas, the enhanced magnitude may indicate precursory activity to a moderate earthquake along the western edge of the North American plate in the next several weeks." (January 19-20, 2020)

 

The area of southern California where increased seismicity was expected saw a moderate M 4.6 on January 25 near Barstow and M 4.4 in the Mammoth Lakes region of Central on February 1, 2020, but to day the area of Los Angeles has been relatively quiet." (February 20-21, 2020)

 

The last earthquake within about 50 km of today's epicenter in western Los Angeles, California occurred more than five years ago on January 4, 2015 with M 4.2. An M 4.1 also occurred slightly west of this on March 12, 2016. Forecast 121983 had expected regional seismicity around February 18. This epicenter is located at  104 degrees from the M 6.8 in Turkey of January 24 and may have been promoted by energy from that source.

 

O: 21FEB2020 13:42:53  34.5N  118.6W ML=3.9  EMSC   SOUTHERN CALIFORNIA          

P: 18FEB2020 121983    33.9N  118.3W 2.5-4.3 BAAAA  So. California             

 

The activity in Southern California was joined by unusual quakes to the south in the area of Baja California. The strongest of these was an M 4.0 west of Baja California in a very unusual epicenter. The M 4.0 off the coast of Baja California is the strongest within about 100 km of that epicenter since an M 4.2 on July 8, 2014. Unusual events such as this can often signal unusual stresses which can lead to stronger regional events down the road. Forecast 121979 had expected an event to the east in mid-February. This activity is at the fifth node (72 degrees) from the M 7.0 in the Kuril Islands of February 13, 2020 and may have been promoted by energy from that event.

 

O: 22FEB2020 05:34:08  30.0N  116.4W ML=4.0  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 14FEB2020 121979    30.2N  114.1W 2.0-3.8 CABAA  SW U.S.A                   

 

An M 3.5 north of this was the strongest within about 100 km since an M 4.0 on

January 12, 2020 and an M 3.9 on December 11, 2019. Forecast 121980 had

expected this activity within about 50 km in mid-February.

 

O: 21FEB2020 11:04:24  31.7N  115.6W ML=3.5  EMSC   BAJA CALIFORNIA, MEXICO       

O: 22FEB2020 02:00:01  31.9N  115.6W ML=2.3  EMSC   BAJA CALIFORNIA, MEXICO

O: 22FEB2020 02:10:21  32.3N  115.4W Ml=2.2  EMSC   BAJA CALIFORNIA, MEXICO

O: 22FEB2020 03:40:40  32.4N  115.4W Ml=2.1  EMSC   BAJA CALIFORNIA, MEXICO

P: 14FEB2020 121980    32.4N  115.4W 2.5-4.3 CAAAA  So. California             

 

The strongest earthquake in the U.S. or Canada and in the world today was an M 5.2 in the active area of the western Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote region. This is the largest quake in the western Andreanof Islands since an M 5.4 event on  January 28. That was an aftershock of event of M 6.2 and 6.1 on January 23 and 26. Forecasts 122031 had expected today's activity within about 50 km was likely in mid-February.

 

O: 21FEB2020 10:20:14  51.0N  179.3W Mw=5.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 21FEB2020 10:24:32  51.0N  179.3W mb=4.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 15FEB2020 122031    51.1N  180.0W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

 

M 5.9 SHAKES KAMCHATKA

 

EARTHQUAKE SUMMARY FOR FEBRUARY 20, 2020

 

The strongest seismicity in the world today continued at high latitudes and near the geomagnetic equator. This included events of M 5.9 in Kamchatka at high latitude and of M 5.4-5.5 in the Banda Sea, Indonesia and Mindanao, Philippines near the equator. This may be related to the geomagnetic storm of the past several days as noted in the previous issues of this summary:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field also saw minor storm conditions  with AP at 36. Active conditions in the geomagnetic field are often accompanied by an upswing in global seismicity especially at high latitudes and near the geomagnetic equator." (February 18-29, 2020)

 

The largest earthquake in the world today occurred as an M 5.7-5.9 in Kamchatka. It may have been felt with intensity V in Mohovaja, Kamchatka. At M 5.9 this is the strongest earthquake within about 150 km of this epicenter in Kamchatka since an M 6.4 on March 20, 2016 and prior to that an M 6.6 on November 12, 2013. Forecast 122033 had expected today's event was likely in this area around February 20. This epicenter is at the fourth node (90 degrees) from the M 7.7 in Cuba of January 28 and may have been promoted by energy from that source.

 

O: 20FEB2020 18:57:36  53.7N  160.6E Mw=5.9  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 20FEB2020 122033    54.0N  162.0E 4.0-5.3 AAAAA  E. of Kamchatka            

 

An M 5.4 in the Banda Sea was also felt today. NEIC reported it was lightly felt with intensity II in Northern Territory, Australia at Coonawarra, Darwin and Katherine. Forecast 121889 had expected this activity in mid-February.

 

O: 20FEB2020 20:24:28   6.8S  129.7E Mw=5.4  EMSC   BANDA SEA                    

P: 16FEB2020 121889     8.0S  128.0E 4.0-5.4 BBBAA  Banda Sea                  

 

In Mindanao, Philippines, an M 5.4 event occurred today and was reported by NEIC to have been felt with intensity III in Buayan, Southern Philippines. Forecast 121885 had expected this activity in mid-February.

 

O: 20FEB2020 09:54:06   5.7N  125.6E Mw=5.4  EMSC   MINDANAO, PHILIPPINES        

P: 18FEB2020 121885     2.0N  125.0E 4.0-5.3 ACAAA  Mindanao, Philippines      

 

The strongest earthquake in the U.S. or Canada today was an M 3.6 in Central Alaska. The last earthquake of M>=3.6 within about 100 km of today's epicenter was an M 3.7  on February 2, 2020 and prior to that an M 3.7 on January 14 and an M 3.9 on January 11. Forecast 122049 had expected activity in this area around February 19. NEIC reported this earthquake of M 3.3 in  Central Alaska was felt with intensity II-III in the area(s) of Central Alaska at Fairbanks, Fort Wainwright, North Pole, Eielson, Delta Junction.

 

O: 20FEB2020 09:32:51  64.9N  149.1W ML=3.6  EMSC   CENTRAL ALASKA               

P: 19FEB2020 122049    63.1N  151.9W 3.2-4.8 ABAAA  Central Alaska             

 

The strongest earthquake felt in the U.S. or Canada outside Alaska today was an M 3.2-3.3 in the Ridgecrest area of Southern California. NEIC reported it was felt with intensity II-III in Ridgecrest and Wofford Heights, California.

Some evidence suggests that Southern California, and especially the valleys west of Los Angeles, may see enhanced seismicity at this time. When an M 6.0 in New Guinea at 103 degrees from Southern California occurred this summary suggested:

 

"The strongest earthquake in the world today was an M 6.0-6.1 in northern New Guinea. NEIC reported it was felt with intensity IV in Aberpura, Papua New Guinea, Indonesia. Strong earthquakes in this area can affect seismicity in the Los Angeles area of California as it is located at 103 degrees from this. Major quakes in New Guinea are often followed by moderate to strong quakes in southern California about a month later. Major quakes in California often occur in January and February (for example San Fernando - February 9, 1971 and Northridge - January 16, 1994). Today's event is not large enough to trigger this large an event but may be precursory to larger regional events in New Guinea." (January 19, 2020)

 

When an M 4.5 on the Kansas-Nebraska border followed the next day this summary followed up on this with:

 

"While this appears to be part of the general increased seismicity in Oklahoma and Kansas, the enhanced magnitude may indicate precursory activity to a moderate earthquake along the western edge of the North American plate  in the next several weeks." (January 19-20, 2020)

 

The area of southern California where increased seismicity was expected saw

a moderate M 4.6 on January 25 near Barstow and M 4.4 in the Mammoth Lakes region of Central on February 1, 2020, but to day the area of Los Angeles has been relatively  quiet.

 

O: 20FEB2020 08:53:19  35.6N  117.5W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 21FEB2020 03:11:41  35.7N  117.5W ML=2.1  EMSC   SOUTHERN CALIFORNIA

O: 21FEB2020 01:10:26  35.8N  117.6W Ml=2.5  EMSC   CENTRAL CALIFORNIA

O: 20FEB2020 07:12:30  35.9N  117.7W ML=2.5  EMSC   CENTRAL CALIFORNIA

O: 20FEB2020 19:00:18  35.6N  117.4W Ml=2.4  EMSC   SOUTHERN CALIFORNIA          

P: 18FEB2020 121950    35.7N  117.6W 2.5-4.3 AAAAA  California/Nevada area     

 

HIGH LATITUDE SEISMICITY CONTINUES WITH GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR FEBRUARY 19, 2020

 

A series of earthquakes  occurred at high latitudes today. These included an M 4.5 in the Arctic Ocean near Svalbard; an M 5.1 in the South Sandwich Islands of the South Atlantic and an M 5.0 in the Bouvet Island region of the South Atlantic. The occurrence of these events at this time may be related to the strong geomagnetic storm at high latitudes which continued today and was reported on in this summary in the previous issue as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field also saw minor storm conditions  with AP at 36. Active conditions in the geomagnetic field are often accompanied by an upswing in global seismicity especially at high latitudes and near the geomagnetic equator." (February 18-29, 2020)

 

They follow an unusual M 5.5 in the Arctic Ocean yesterday which was the strongest in that region in the past 18 years as noted at the time:

 

"Today's event is the strongest within about 400 km of today's event in the Arctic Ocean since an M 5.4-5.6 on May 3, 2002, the only other such event in the are in the past 30 years." (February 18-19, 2020)

 

Today's event in the Bouvet Island region is the strongest since an M 5.6 on January 12, 2020 and an M 5.1-5.4 on November 17, 2019. It is antipodal to the recent activity in the central Andreanof Islands at 175 West longitude. This activity began with an M 6.4 on November 24, 2019 and has been followed by the most recent aftershock of M 5.0 on February 13, 2020. The Bouvet Island quake had been expected in forecast 122093 within about 150 km of today's epicenter to occur around February 21.

 

O: 20FEB2020 06:42:23  54.6S    5.5E mb=5.0  EMSC   BOUVET ISLAND REGION         

P: 21FEB2020 122093    55.0S    2.0E 4.0-5.3 AABAA  Atlantic-Indian Ridge      

 

The South Sandwich Islands saw seismic events of M 6.1 on February 8 and January 20 but both of these were about 250 km south of today's epicenter. The last such event with M>=5.1 in the area within about 150 km of this epicenter occurred on June 24, 2019 with M 5.5.  Forecast 122095 had expected today's earthquake within about 50 km was likely around February 20. This epicenter is near the antipode of the M 7.0 in the Kuril Islands of February 13, 2020.

 

O: 20FEB2020 04:01:45  57.6S   26.1W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 20FEB2020 122095    58.0S   26.0W 4.0-5.6 AAAAA  So. Sandwich Islands       

 

The last earthquakes in Svalbard of M>=4.4 occurred on December 18, 2019 (M 4.8) and January 23, 2020 about 100 km south of today's epicenter. Forecast 121832 had expected today's activity was likely around February 11.

 

O: 19FEB2020 09:38:23  77.5N    7.4E mb=4.5  EMSC   SVALBARD REGION               

P: 11FEB2020 121832    79.0N    7.0E 4.0-5.4 CBAAA  Arctic Ocean Region        

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 off the coast of Oregon. NEIC reported this earthquake was felt with intensity II-III along the coast of Oregon at Bandon, Coos Bay, Brookings, Eugene, Portland and Bend.

This follows a similar M 4.7 on February 8, 2020 about 150 km southeast of this and M 5.9 near this epicenter on September 5, 2019.  Forecast 122020 had expected today's event was likely within about 75 km of the epicenter around February 16. Other regional activity accompanied this event in the Vancouver and Queen Charlotte Island region of British Columbia with M 3.0 and 2.6.

 

O: 19FEB2020 21:38:06  43.7N  127.9W mb=4.5  EMSC   OFF COAST OF OREGON          

P: 16FEB2020 122020    44.1N  128.8W 3.0-4.3 BAAAA  Off Coast of Oregon        

 

An unusual earthquake of M 3.7-3.9 shook areas of central and northern France in Brittany today. NEIC reported maximum intensity IV in Landeda, Bretagne, France and II-III in Bretagne at Landemeau, Brest, Bohars, Plouzane and Saint-Pabu. This is the strongest earthquake in the Brittany area within about 100 km of this epicenter since an M 3.9 on April 28, 2016 about 50 km northwest of today's epicenter. No events of M>3.9 have occurred in the area in the past 30 years.

Forecast 122044 had expected today's event was likely around February 21.

 

O: 19FEB2020 21:20:56  48.4N    4.2W ML=3.7  EMSC   FRANCE                       

P: 21FEB2020 122044    51.0N    3.0W 3.0-4.4 ACAAA  United Kingdom             

 

Another unusual earthquake occurred today near the coast of Libya. This event  is the strongest within about 200 km of this epicenter since an M 4.8 on February 9, 2012. No other activity within about 100 km of today's epicenter has been recorded at this magnitude level in the past 30 years. Forecast 121961 had expected it within this region was likely around February 15.

 

O: 19FEB2020 08:19:01  32.8N   23.0E mb=4.6  EMSC   NEAR COAST OF LIBYA           

P: 15FEB2020 121961    34.0N   24.0E 3.0-4.3 BBAAA  Crete                      

 

An unusual quake also shook areas of western Texas today. NEIC reported intensity IV in Texas at Gardendale, Midland and Odessa and II-III in Andrews, Texas. Today's event is the first of M>=3.3 in western Texas within about 100 km of this epicenter in more than 30 years. Prior activity about 200 km northeast of this occurred between 2008 and 2019 and may have been related oil mining in the area.  Other activity recently in western Texas has concentrated to the west near 103.5 and 104.5 West longitude.

 

O: 19FEB2020 20:54:44  32.0N  102.3W mb=3.3  EMSC   WESTERN TEXAS                

 

GEOMAGNETIC STORM COINCIDES WITH HIGH LATITUDE SEISMICITY

 

EARTHQUAKE SUMMARY FOR FEBRUARY 18, 2020

 

The strongest earthquake in the world today was an M 5.4 in the Arctic Ocean north of Svalbard. It was not reported felt in this remote area. It occurred as a strong geomagnetic storm was beginning at high latitudes as described in this summary:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field also saw minor storm conditions  with AP at 36. Active conditions in the geomagnetic field are often accompanied by an upswing in global seismicity especially at high latitudes and near the geomagnetic equator." (February 18-29, 2020)

 

Today's event is the strongest within about 400 km of today's event in the Arctic Ocean since an M 5.4-5.6 on May 3, 2002, the only other such event in the area in the past 30 years. Forecasts 121832 abnd 122056 had expected regional seismicity in mid-February. This epicenter is at the fifth node (72 degrees) from the M 7.7 south of Cuba of January 28 and may have promoted by energy from that source.

 

O: 18FEB2020 07:29:38  85.8N   22.9E mb=5.4  EMSC   NORTH OF SVALBARD            

P: 11FEB2020 121832    79.0N    7.0E 4.0-5.4 ACAAA  Arctic Ocean Region        

P: 21FEB2020 122056    74.0N   14.0E 3.0-4.6 BCAAA  Arctic Ocean Region        

 

A moderate earthquake of M 4.6 shook regions of eastern China in Shandong.

This is the strongest earthquake within about 250 km of this epicenter  since events of M 4.6 on February 12, 2018 and January 23, 2013. The last earthquake in the region of significantly larger magnitude was an M 5.1 on September 20, 1995 and M 5.0 on January 28, 1991. Forecast 121990 had expected in this area of China was likely around February 18.

 

O: 18FEB2020 09:07:23  36.5N  116.9E mb=4.6  EMSC   SHANDONG, CHINA              

P: 18FEB2020 121990    39.0N  116.0E 3.5-4.8 ACAAA  So. China                  

 

A pair of moderate earthquakes of M 4.3 and 4.8 also shook the area of western Turkey south of Istanbul.  NEIC reported this earthquake of M 4.8 in Western Turkey  was felt with intensity II-III in the area(s) of Western Turkey in Balikesir (IV) and Izmir, Foca, Bursa, Mudanya, Istanbul. The last earthquake of M>=4.8 within about 250 km of this epicenter was an M 4.9 on February 4. These appear to be aftershocks of an M 5.6 on January 22, 2020 and continue regional activation which began in late 2019. Forecast 121994 had expected today's event within about 150 km of this epicenter was likely around February 18.

 

O: 18FEB2020 16:45:18  39.1N   27.8E ML=3.9  EMSC   WESTERN TURKEY               

O: 18FEB2020 17:20:24  39.1N   27.8E ML=3.9  EMSC   WESTERN TURKEY               

O: 18FEB2020 21:23:09  39.1N   27.8E ML=4.3  EMSC   WESTERN TURKEY               

O: 18FEB2020 16:09:23  39.1N   27.8E mb=4.8  EMSC   WESTERN TURKEY               

P: 18FEB2020 121994    38.0N   29.0E 3.5-4.8 ABAAA  Turkey                     

 

MODERATE EARTHQUAKE IN BONIN ISLANDS, JAPAN

 

EARTHQUAKE SUMMARY FOR FEBRUARY 17, 2020

 

A moderate earthquake of M 5.4 occurred today south of Honshu in the Bonin Islands, Japan. It was not reported felt in this remote area. This area can generate large earthquakes but has been relatively quiet in recent years. The last event within about 200 km of today's epicenter was an M 5.4 on December 25, 2018. The last event of larger magnitude in the area was an M 5.7 on December 21, 2017. The current lull in regional seismicity may be due to stress release with the M 7.8 south of this on May 30, 2015. Forecast 121934 had expected today's activity in the Bonin Islands around February 20.

 

O: 17FEB2020 12:54:53  28.6N  142.7E Mw=5.4  EMSC   BONIN ISLANDS, JAPAN REGION  

P: 20FEB2020 121934    27.0N  140.0E 4.0-5.3 BBBAA  Bonin Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 4.7-4.9 in the Alaska Peninsula. NEIC reported it was felt with intensity III in Kodiak, Alaska. The last earthquake within about 150 km of this epicenter with M>=4.9 was an M 5.2 more than a year ago on January 22, 2019 and before that an M 5.3 on May 11, 2018. Forecast 122029 had expected today's event within about 100 km of this epicenter was likely around February 15.

 

O: 17FEB2020 09:18:04  57.5N  156.0W mb=4.9  EMSC   ALASKA PENINSULA             

P: 15FEB2020 122029    56.8N  156.7W 3.5-4.8 AAAAA  Alaska Peninsula           

 

MODERATELY STRONG QUAKE SHAKES SOUTHERN IRAN

 

EARTHQUAKE SUMMARY FOR FEBRUARY 16, 2020

 

The strongest earthquake in the world today was an M 5.5 in southern Iran. NEIC reported it was felt with maximum intensity IV in Iran at Gheshm and Bandar Abbas. It was also felt with intensity II-IV in the United Arab Emerates at Umm, Ras Al Khaimah, Ujman, Ash-Shariqah, Khawi, Dubai. An M 4.6 foreshock preceded it by about 6 minutes. This is the strongest earthquake in southern Iran within about 200 km of this epicenter since a similar M 5.5 about 150 km north of this on January 22, 2016 but the last of significantly larger magnitude in the area was an M 6.1 on May 1, 2013. Forecast 121944 had expected today's earthquake was likely in this area around February 18. This epicenter is at the fifth node (72 degrees) from the M 7.0 in the Kuril Islands of February 13 and may have been promoted by energy from this source. Other moderate quakes at the fifth node from the Kuril Islands included a moderate M 4.8 in eastern Turkey and several events including an M 3.3 in Baja California.

 

O: 16FEB2020 12:30:47  27.1N   55.8E Mw=5.2  EMSC   SOUTHERN IRAN                

O: 16FEB2020 12:30:47  27.1N   55.7E Mw=5.5  ANSS   SOUTHERN IRAN                

O: 16FEB2020 12:24:52  27.1N   55.8E mb=4.6  EMSC   SOUTHERN IRAN                

P: 18FEB2020 121944    28.0N   55.0E 3.5-4.9 AAAAA  So. Iran/Persian Gulf      

 

Moderately strong earthquakes of M 5.4 and 5.5 also occurred today in the northern Kuril Islands an in the Kermadec Islands of New Zealand. The M 5.4 in the Kuril Islands follows an M 7.0 in the southern Kuril Islands of February 13 and is the strongest in the northern Kuril Islands since an M 6.5 and aftershocks on October 9-11, 2018. Forecast 122013 had expected today's event in the region was likely around February 18.

 

O: 16FEB2020 07:35:37  49.4N  155.5E mb=5.4  EMSC   KURIL ISLANDS                

P: 18FEB2020 122013    48.0N  155.0E 3.5-5.4 ABAAA  NE Pacific                 

 

The earthquake of M 5.5 south of the Kermadec Islands, New Zealand was not reported felt in this remote area. The last earthquake of M>=5.5 within about 200 km of this epicenter occurred on July 23, 2019 with M 5.5. Forecast 122084 had expected today's event was likely about 100 km north of this epicenter around February 14.

 

O: 17FEB2020 00:28:12  33.1S  180.0W Mw=5.5  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 14FEB2020 122084    32.0S  180.0W 4.0-5.4 BBAAA  So. Kermadec Islands       

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in the western Andreanof Islands. It was not reported felt in this remote area. It is part of an activation of the region in late January which saw events in the region of M 6.1 and 6.2. It is the strongest event in the western Andreanof Islands since an M 5.4 on January 28, 2020. Forecast 122031 had expected today's activity was likely around February 15.

 

O: 17FEB2020 03:33:14  51.2N  178.2W Mw=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 15FEB2020 122031    51.1N  180.0W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

 

MODERATELY STRONG QUAKE SHAKES TAIWAN

 

EARTHQUAKE SUMMARY FOR FEBRUARY 15, 2020

 

A moderately strong M 5.2-5.7 earthquake was widely felt in Taiwan today. NEIC reported maximum intensity IV in Yunlin and II-III in Hualien, Nantou, Ilan, Taichung, Hsinchu, and Taipei. Aftershock of M 5.1 and M 5.2 were reported by NEIC to have been felt with intensity II-III in Taichung, Changhua and Taipei, Taiwan. CWB reported these earthquakes were felt with maximum intensity in Hualien (IV); III in Nantou, Taichung, Yilan, Taoyuan, Changhua, Yunlin, Miaoli; II in Taitung, Chiayi, Hsinchu, Taipei and I in Pingtung and Penghu and Kaohsiung Counties, Taiwan. This follows a series of moderate earthquake in Taiwan which occurred on February 13. This epicenter is located at the 12th node (30 degrees) from the M 7.0 in the Kuril Islands two days ago and may have been promoted by energy from that source. The last earthquake in Taiwan of M>=5.7 was an M 5.9 on August 7, 2019 and prior to that an M 6.1 on April 18, 2019. Forecast 121946 had expected today's activity was likely within about 50 km of this epicenter around February 16.

 

O: 15FEB2020 19:16:33  23.8N  121.5E ML=4.0  EMSC   TAIWAN

O: 15FEB2020 11:00:05  23.8N  121.6E Mw=5.2  EMSC   TAIWAN

O: 15FEB2020 11:00:06  23.8N  121.5E Mw=5.7  ANSS   TAIWAN

O: 15FEB2020 19:20:13  23.8N  121.6E mb=4.8  EMSC   TAIWAN

O: 15FEB2020 11:05:00  23.8N  121.6E mb=5.1  EMSC   TAIWAN                       

O: 15FEB2020 11:00:06  23.8N  121.5E ML=5.5  TAI    Hualien, Taiwan              

O: 15FEB2020 11:05:00  23.8N  121.5E ML=5.1  TAI    Hualien, Taiwan              

O: 15FEB2020 19:16:33  23.8N  121.5E ML=4.0  TAI    Hualien, Taiwan              

O: 15FEB2020 19:20:14  23.8N  121.5E ML=4.9  TAI    Hualien, Taiwan              

P: 16FEB2020 121946    24.0N  122.0E 4.0-5.3 AAAAA  Taiwan                     

 

When the foreshocks occurred on February 13, this summary noted them as follows:

 

 

O: 13FEB2020 07:44:06  22.7N  120.7E ML=4.0  TAI    Hualien, Taiwan              

O: 13FEB2020 07:44:06  22.7N  120.7E ML=4.0  EMSC   TAIWAN                       

P: 11FEB2020 121713    21.0N  120.0E 4.0-5.3 ABAAA  Taiwan                     

P: 15FEB2020 121945    21.0N  120.0E 4.0-5.3 ABAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity III in Pingtung; II in Kaohsiung and I in Tainan, Chiayi Counties, Taiwan.

 

O: 13FEB2020 17:49:18  24.2N  122.2E mb=4.7  EMSC   TAIWAN REGION                

O: 13FEB2020 17:49:19  24.3N  122.1E ML=4.8  TAI    Hualien, Taiwan               

P: 16FEB2020 121946    24.0N  122.0E 4.0-5.3 BAAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity II in Yilan, Hualien and Taipei and I in Taoyuan, Taipei, Taichung, Hsinchu, Miaoli, Nantou, Chiayi, Changhua, Yunlin and Taitung Counties, Taiwan.

 

O: 13FEB2020 20:25:06  23.7N  121.7E ML=4.0  TAI    Hualien, Taiwan              

P: 16FEB2020 121946    24.0N  122.0E 4.0-5.3 BAAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity II in Hualien and I in Taitung, Nantou, Yunlin and Changhua Counties, Taiwan.

 

O: 13FEB2020 21:38:42  22.4N  121.4E ML=4.6  TAI    Hualien, Taiwan              

O: 13FEB2020 21:38:40  22.4N  121.4E Mw=4.6  EMSC   TAIWAN REGION                

P:  7FEB2020 121714    23.0N  122.0E 4.0-5.3 AAAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity III in Taitung and I in Pingtung, Hualien and Kaohsiung Counties, Taiwan. NEIC reported this earthquake of M 4.6 in Taiwan  was felt with intensity II-III in the area(s) of Tainan, Taiwan.

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in Southern Alaska. NEIC reported it was felt with maximum intensity IV  on the Matanuska-Sustina Border and II-III in Talkeetna, Cantwell, Willow, Wasilla, Chugiak, Fort Richardson, Eagle River and Anchorage, Alaska. This is the largest earthquake within about 100 km of this epicenter in Central Alaska since an M 4.6 on October 27, 2019 and prior to that an M 5.0 on July 10, 2018. Forecast 122049 had expected today's activity in this region was likely around February 19.

 

O: 15FEB2020 07:17:21  62.8N  149.6W Mw=4.3  EMSC   CENTRAL ALASKA               

P: 19FEB2020 122049    63.1N  151.9W 3.2-4.8 BAAAA  Central Alaska             

 

Moderate earthquakes of M 5.4-5.6 were also recorded today in central Indonesia in the Seram area and in the Molucca area. These are aftershock of recent large earthquakes in these areas. The Seram event follows an M 5.6 on February 8 while the event in Molucca was probably and aftershock of the M 7.1 of November 14, 2019. This activity had been expected in forecasts 121884 and 121893 to occur around February 15-16. These events are located at 145-146 degrees from the M 7.7 south of Cuba of January 28 and may have been promoted by energy from that source.

 

O: 15FEB2020 15:36:41   1.6N  126.5E Mw=5.4  EMSC   MOLUCCA SEA                  

O: 15FEB2020 17:46:58   1.6N  126.6E ML=4.5  EMSC   MOLUCCA SEA                  

P: 15FEB2020 121884     1.0N  127.0E 4.0-5.5 AAAAA  Halmahera                  

 

O: 15FEB2020 23:00:26   3.4S  131.5E Mw=5.6  EMSC   CERAM SEA, INDONESIA         

P: 16FEB2020 121893     3.0S  129.0E 4.0-5.3 AACAA  Ceram  Island area         

 

 

 

 

 

CANADA SHAKES IN EAST AND WEST

 

EARTHQUAKE SUMMARY FOR FEBRUARY 14, 2020

 

The largest earthquake in the U.S. or Canada today was an M 4.6-4.7 in the Queen Charlotte Islands region, British Columbia, Canada. It was reported by NEIC to have been felt with intensity III in Walnut Cove, British Columbia and possibly at Point Roberts, Washington. The last earthquake of M>=4.7 in the area of Queen Charlotte Islands within about 250 km of this epicenter occurred on December 23 and 25, 2019 with maximum sized events of M 6.0, 6.0 and 6.3.  Forecast 122032 had expected this activity was likely in mid-February. This activity is located at the seventh node (51 degrees) from both of the last major earthquakes in the world - the M 7.7 south of Cuba on January 28 and the M 7.0 in the Kuril Islands, February 13. Constructive interference of seismic energy from these two sources may have helped promoted today's activity.

 

O: 14FEB2020 11:17:05  51.6N  130.9W MB=4.5  ECAN OF VILLAGE OF QUEEN CHARLOTTE, 

O: 14FEB2020 11:17:00  51.3N  131.4W MB=4.7  ECAN Village of Queen Charlotte, BC 

O: 14FEB2020 11:17:05  51.5N  130.9W Mw=4.6  EMSC   QUEEN CHARLOTTE ISLANDS REGION

P: 13FEB2020 122032    50.3N  130.2W 3.0-5.0 ABAAA  British Colombia           

 

Two light earthquakes of M 3.5 and 3.7 also occurred northwest of the M 4.7 in the Queen Charlotte Island region today. Forecasts 121809 and 122032 had expected this activity in early to mid-February.

 

O: 14FEB2020 09:56:58  52.7N  132.3W MB=3.5  ECAN Village of Queen Charlotte, BC 

O: 14FEB2020 06:32:19  53.7N  132.8W MB=3.7  ECAN Port Clements, BC   

O: 14FEB2020 09:56:58  52.7N  132.3W ML=3.5  EMSC   QUEEN CHARLOTTE ISLANDS REGION

P:  6FEB2020 121809    52.0N  132.0W 3.0-4.9 CAAAA  British Colombia           

P: 18FEB2020 122032    54.0N  134.0W 3.0-4.9 BBAAA  British Colombia           

 

 

A pair of light earthquakes also occurred on he opposite side of North America in the region of Labrador and Nunavit, Canada with M 3.2 and 3.8 respectively. They were not reported felt. The event of M 3.2 in Labrador may be an aftershock of an M 4.3 that hit the region on February 3.

 

O: 14FEB2020 13:14:36  54.9N   59.5W MB=3.2  ECAN Labrador, Canada      

O: 14FEB2020 13:14:36  54.9N   59.5W ML=3.2  EMSC   LABRADOR, NFLD. AND LAB., CANA

 

The earthquake in Nunavit, Canada of M 3.8 was located near Dundas Harbour.

It is the largest event within about 300 km of this epicenter since an M 4.0

on March 24, 1991, the only such event of M>=3.8 in the area in the past 30 years.

 

O: 14FEB2020 09:11:10  74.4N   82.0W MB=3.8  ECAN Dundas Harbour, NU   

O: 14FEB2020 09:11:10  74.4N   82.1W ML=3.8  EMSC   DEVON ISLAND, NUNAVUT, CANADA

 

The strongest earthquakes in the world today was an M 5.1 in the region of Xinjiang, China and in the South Sandwich Islands.  They were not reported felt in these remote areas and is part of a series of moderate earthquakes in the area over the past two weeks which has included events of M 6.1 on February 8 and January 20, 2020. Forecast 122095 had expected today's activity within about 150 km of the epicenter was likely in mid-February.

 

An M 6.0 hit southern Xinjiang, China about 200 km southwest of today's epicenter on January 19, 2020 but the last within about 150 km of today's event with M>=5.1 was an M 5.1 on December 5, 2019 and October 27, 2019. The last of larger magnitude in this area was an M 6.1 on January 28, 2013.  Forecast 122008 had expected today's event within about 50 km was likely around

February 15.

 

O: 14FEB2020 09:55:24  59.0S   25.5W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 12FEB2020 122095    60.0S   29.0W 4.0-5.5 AABAA  So. Sandwich Islands       

P: 20FEB2020 122095    58.0S   26.0W 4.0-5.6 CAAAA  So. Sandwich Islands       

 

O: 15FEB2020 03:32:00  41.8N   79.3E mb=5.1  EMSC   SOUTHERN XINJIANG, CHINA     

P: 15FEB2020 122008    42.0N   79.0E 4.0-5.4 AAAAA  Kirgizstan/Xinjiang        

 

MAJOR KURIL ISLANDS QUAKE AT 102-103 DEGREES FROM CUBA

 

EARTHQUAKE SUMMARY FOR FEBRUARY 13, 2020

 

A major earthquake of M 6.9-7.0 shook regions of the Kuril Islands today. NEIC reported maximum intensity V in Hokkaido and IV in Sakhalin, Russia. Intensity II-IV was reported from areas of Hokkaido within about 500 km of the epicenter.

This epicenter is at 102-103 degrees from the M 7.7 south of Cuba on January 28, and the first major quake in the world since that time. Seismic energy from large earthquakes concentrates at the surface around 102-103 degrees from the mainshock epicenter after reflection and refraction off inner earth boundaries. Strongly enhanced seismicity in this distance range is common following major earthquakes. At the time of the event in the Cuba region of January 28, this summary had noted the potential for a strong quake in Hokkaido and northern Japan and the Kurils as:

 

"The earthquake near Cuba may reset global seismicity as it is the strongest

in nearly a year in the world. Far-field triggering is most likely in eastern

Turkey, Iran/Iraq and the east African Rift valley as well as in Hokkaido and northern Japan (103 degrees)" (January 28-29, 2020)

 

and in the previous issue:

 

"Seismicity around the world continued at quiet levels today. It appears that it is increasing however. The dampening effect of the full moon alignment often disappears around 4 days after the full moon and a moderate to strong earthquake is possible in the next day or two.

 

As in the past several days, the largest earthquakes in the world today were of

M 5.0-5.3 and occurred in Vanuatu and Fiji, northern Chile and in Japan." (February 12-13, 2020)

 

Today's event of M 7.0 in the Kuril Islands is the strongest quake recorded in the Southern Kuril Islands in near seven years - since an M 7.2 on April 19, 2013 and prior to that an M 7.3 on November 17, 2002. After the M 7.7 in Cuba region of January 28, it is the strongest earthquake in the world during 2020. Forecast 122024 had expected today's event was likely in mid-February within about 50 km of this epicenter.

 

O: 13FEB2020 10:33:44  45.7N  148.7E Mw=6.9  EMSC   KURIL ISLANDS                

O: 13FEB2020 10:33:44  45.6N  148.9E Mw=7.0  ANSS   KURIL ISLANDS                

P: 18FEB2020 122024    45.0N  149.0E 3.5-5.4 BAAAA  So. Kurils                 

 

An earthquake of M 5.5 also occurred in the South Pacific today on the Pacific-Antarctic Ridge. It was not reported felt in this remote area. Recent earthquakes of M>=5.5 in the region occurred as an M 5.5 on October 9, 2019 and M 5.9 on May 1, 2018.

 

O: 14FEB2020 05:59:00  56.6S  142.3W Mw=5.5  EMSC   PACIFIC-ANTARCTIC RIDGE      

 

The strongest earthquakes in the U.S. or Canada today continued in the Aleutian Islands with an M 5.0 in the Central Andreanof Islands and an M 4.9 in the Rat Islands. These were not reported felt in these remote areas. Forecast 121815 and 121807 had expected this activity was likely in early February.

 

O: 13FEB2020 14:07:39  51.6N  177.3E mb=4.9  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  8FEB2020 121815    51.0N  178.0E 4.0-5.5 BAAAA  Rat Islands                

 

O: 13FEB2020 15:26:25  51.2N  175.0W mb=5.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 13FEB2020 15:38:46  51.3N  175.0W ml=3.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 13FEB2020 15:30:49  51.3N  175.1W ml=3.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 13FEB2020 15:29:39  51.1N  174.9W mb=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6FEB2020 121807    50.3N  176.2W 3.5-4.8 CAAAA  Andreanoff Isls, Aleutians 

 

QUIET SEISMIC PATTERN ABOUT TO CHANGE?

 

EARTHQUAKE SUMMARY FOR FEBRUARY 12, 2020

 

Seismicity around the world continued at quiet levels today. It appears that it is increasing however. The dampening effect of the full moon alignment often disappears around 4 days after the full moon and a moderate to strong earthquake is possible in the next day or two.

 

As in the past several days, the largest earthquakes in the world today were of

M 5.0-5.3 and occurred in Vanuatu and Fiji, northern Chile and in Japan. As the earth becomes more active these areas are likely to lead the way. The strongest activity in Japan today occurred off the east coast of Honshu (M 5.2) and in the area of Hokkaido (M 4.4). Forecast 122005 had expected the Hokkaido event was likely within about 150 km around February 15. This epicenter is at the fifth node (72 degrees) from the M 6.8 in Eastern Turkey of January 24 and may have been promoted by energy from that source. It is also near 103 degrees from the M 7.7 in Cuba of January 28. The 103 degree distance in this area passes through the southern Kuril Islands, an active area which may see additional strong promotion from Cuba. The earthquake off eastern Honshu was the strongest within about 100 km of that epicenter since an M 5.2-5.3 on February 6, 2020 and an M 5.2 on December 11, 2019. The last event of larger magnitude in this area was an M 6.3 on August 4, 2019.  Forecast 121976 had expected this activity in Japan was likely in mid-February.

 

NEIC reported the earthquake of M 5.2 in Honshu, Japan  was felt with intensity II-III in the area(s) of Honshu, Japan in Fukusima and Miyagi (V); Tochigi, Ibaraki, and Chiba.

 

O: 12FEB2020 10:37:19  37.3N  141.3E Mw=5.2  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 14FEB2020 121976    36.0N  142.0E 4.0-5.3 ABAAA  Off East Coast Honshu      

P: 19FEB2020 121976    38.0N  142.0E 4.0-5.4 CAAAA  Off East Coast Honshu      

 

O: 12FEB2020 10:36:30  42.7N  142.0E ML=4.4  EMSC   HOKKAIDO, JAPAN REGION       

P: 15FEB2020 122005    44.0N  142.0E 3.5-5.3 BBAAA  Hokkaido, Japan            

 

An earthquake of M 5.0-5.2 also shook the region of northern Chile near Tarapaca today. GUC reported this earthquake was felt with intensity  III in  Arica and Parinacota at Arica, Chile. NEIC reported these earthquakes of M 5.0 and 4.4 in Northern Chile were felt with intensity II-III in the area(s) of Northern Chile at Iquique, Tarapaca. Forecast 121857 had expected this activity was likely around February 11.

 

O: 13FEB2020 05:50:38  21.0S   70.8W Mw=5.0  EMSC   OFFSHORE TARAPACA, CHILE     

O: 13FEB2020 06:36:28  21.0S   71.0W mb=4.4  EMSC   OFFSHORE TARAPACA, CHILE     

O: 13FEB2020 05:50     20.9S   70.9W mb=5.2  GUC    Arica and Parinacota at Arica,

P: 11FEB2020 121857    20.0S   69.0W 4.0-5.3 AABAA  So. Peru/Bolivia           

 

An earthquake in southern Vanuatu of M 5.1 was not reported felt today. It may have been promoted stresses from Tropical Cyclone Uesi which is currently located west of this epicenter. This storm had been expected to enhance seismicity in Vanuatu as noted in previous issues of this summary:

 

"Tropical cyclone Uesi (15P) continued southwest  of Vanuatu today with winds up to 90 kts.  It is likely it could help enhance seismicity in the region of Vanuatu and the Loyalty Islands while it is in the area." (February 11-12, 2020)

 

Forecast 121847 had expected this activity was likely in early February within about 100 km of this epicenter.

 

O: 13FEB2020 06:50:46  19.3S  168.8E mb=5.1  EMSC   VANUATU                      

P:  5FEB2020 121847    19.0S  168.0E 4.0-5.4 CAAAA  Vanuatu Islands            

 

The strongest earthquakes in the U.S. or Canada today continued to occur in the Andreanof Islands of the Aleutians (M 4.6) and in the Alaska Peninsula.  NEIC reported the earthquake of M 4.4 in the Alaska Peninsula  was felt with intensity II-III in the area(s) of the Alaska Peninsula at Kodiak. The M 4.7 in the Alaska Peninsula is near antipodal to activity south of Africa over the past several days. This summary had noted in this regard in previous issues:

 

 

"At high southern latitudes which have seen earthquakes of M 5.5 and 6.2 in the

Drake Passage and South Sandwich Islands in the past two days, an M 5.1 was located south of Africa. The last events in the area within about 400 km of this epicenter occurred on January 10, 2020 (M 5.4) and August 22, 2018 (M 5.6). The antipode of this epicenter is located in the region of the Alaska Peninsula at 53N 153W - an area of limited seismicity. Little effect on the seismicity of that region is expected." (February 11, 2020)

 

O: 13FEB2020 06:53:30  51.3N  175.1W mb=4.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6FEB2020 121807    50.3N  176.2W 3.5-4.8 CAAAA  Andreanoff Isls, Aleutians 

 

O: 12FEB2020 14:16:03  58.8N  154.5W mb=4.7  EMSC   ALASKA PENINSULA              

P: 18FEB2020 122046    60.2N  153.2W 3.2-4.8 CBAAA  Central Alaska             

 

An unusually strong M 3.7-4.0 quake occurred in Central California south of San Francisco today. NEIC reported this earthquake of M 3.7 in Central California  was felt with intensity II-III in the area(s) of Central California at Hollister (IV), Gonzales, San Juan Bautista, Salinaas, Soledad, Paicines and Castroville.

The last earthquake of M>=4 within about 50 km of today's epicenter was an  M 4.7 on October 15, 2019 and prior to that an M 4.1 on November 2, 2018 and an M 4.6 on November 13, 2017. Forecast 121954 had expected today's events within about 10 km of the epicenter likely around February 12. This epicenter is at 103 degrees from the M 6.8 in Eastern Turkey of January 24 and may have been promoted by energy from that source.

 

O: 13FEB2020 03:36:10  36.7N  121.3W MD=2.0  EMSC   CENTRAL CALIFORNIA

O: 13FEB2020 06:26:53  36.7N  121.3W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 13FEB2020 03:33:42  36.7N  121.3W Mw=4.0  EMSC   CENTRAL CALIFORNIA

O: 12FEB2020 18:58:33  36.6N  121.2W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P: 12FEB2020 121954    36.8N  121.3W 2.5-4.4 AAAAA  Central California         

 

QUIET GLOBAL SEISMICITY CONTINUES; UNUSUAL QUAKE NEAR SRI LANKA

 

EARTHQUAKE SUMMARY FOR FEBRUARY 11, 2020

 

As it has for the past four days, global seismicity remained at quiet levels today. The strongest earthquakes were of M 5.3 and M 5.4. These events in the area south of Fiji (M 5.4) and in the Mariana Islands (M 5.3) and northern Chile (M 5.3) were unremarkable and not felt in these regions. Forecasts 122077 and 121695 had expected this activity around February 11-15.

 

O: 11FEB2020 11:07:02  25.2S  180.0E Mw=5.4  EMSC   SOUTH OF FIJI ISLANDS        

P: 15FEB2020 122077    23.0S  179.0E 4.0-5.3 BCAAA  Tonga/Fiji                 

 

O: 11FEB2020 10:37:01  15.8N  147.9E mb=5.3  EMSC   MARIANA ISLANDS REGION       

P: 11FEB2020 121695    16.0N  145.0E 4.0-5.3 AACAA  No. Marianas               

 

An M 5.3 in northern Chile was felt in that region. GUC reported this earthquake was felt with intensity  IV in  Atacama at Chanaral; III in Copiapo, Diego de Almagro and Tierra Amarilla and in Antofagasta with III in Antofagasta and Taltal, Chile. NEIC reported this earthquake of M 5.2 in Northern Chile  was felt with intensity II-III in the area(s) of Northern Chile at Taltal, Antofagasta and Copiapo, Atacama. This is an active area but the last earthquake of M>=5.3 within about 250 km of this epicenter occurred nearly a year ago with an M 5.4 on March 28, 2019. Forecast 121851 had expected today's event was likely around February 11.

 

O: 11FEB2020 13:50     24.8S   70.8W mb=5.3  GUC    Atacama at Chanaral; III in Co

P: 11FEB2020 121851    24.0S   69.0W 4.0-5.3 AABAA  Coast No. Chile            

 

An unusual earthquake of M 4.7 also occurred near Sri Lanka today. NEIC reported this earthquake of M 4.7 in Sri Lanka  was felt with intensity II-III in the area(s) of Sri Lanka at Matara, Weligama, Galla, Nuiwara Eliya, Kotte, Colombo and Kelaniya Gampaha. The only earthquake of M>=4.7 in this area within about 300 km in the past 30 years was an M 5.2 on July 18, 2007. An earthquake of M 4.5 hit west of this in the Maldive Islands on February 5 and was also very unusual. It is possible that a regional stress helped trigger both of these events south  of India. When the Maldive Islands quake occurred this summary noted:

 

"An unusual M 4.5 occurred in the Maldive Islands today. NEIC reported it was felt with intensity II in the Maldives at Kulhudhuffushi, Haa, Feydhoo, Goidhoo, Firubaidhoo. The Maldive Islands, located south of India, lie at an elevation near sea level. As such, they are greatly impacted by changes in sea level compared to Island surface. They were inundated, for example, during the December 26, 2004 Indian Ocean-wide tsunami. Subsidence-related seismicity in the area could be a major problem for this island nation. This epicenter is at 142 degrees from the M 7.7 south of Cuba of January 28, a  distance at which seismic energy concentrates at the surface of the earth and may have been promoted by energy from that event. It is the largest earthquake in the region of the Maldive Islands within about 250 km in  at least 30 years." (February 6, 2020)

 

O: 11FEB2020 21:04:20   4.6N   83.5E mb=4.7  EMSC   NORTH INDIAN OCEAN           

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the Near Islands, Aleutians at the westernmost edge of those islands. This is a remote area and this earthquake was not reported felt in the region. The last earthquakes in the Near Islands of M>=4.9 occurred on January 1, 2020 (M 5.1) and October 26, 2019 (M 5.4) and prior to that in August, 2017. The last earthquake in the area of M>=5.4 was an M 6.8 north of today's epicenter on June 2, 2017.  Forecast 122040 had expected today's event was likely around February 13.

 

O: 12FEB2020 00:43:22  52.7N  171.9E mb=4.9  EMSC   NEAR ISLANDS, ALEUTIAN ISLANDS

P: 13FEB2020 122040    52.0N  174.0E 4.0-5.6 AABAA  Rat Islands                

 

Other seismicity at high latitudes today occurred south of Africa (M 5.0) and in the South Sandwich Islands (M 4.9). These events were not reported felt in these remote areas. The event in the South Sandwich Islands is an aftershock of an M 6.2 three days ago. The earthquake South of Africa is at the antipode of the Fox Islands (52N 163W) where some antipodal activity may occur in the next several days. This activity at high latitudes continues the trend associated with a geomagnetic storm four days ago.

 

O: 11FEB2020 13:07:28  52.3S   17.0E mb=5.0  EMSC   SOUTHWEST OF AFRICA          

 

O: 11FEB2020 07:39:57  60.4S   25.7W mb=4.9  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  6FEB2020 121877    60.0S   26.0W 4.0-5.5 BAAAA  So. Sandwich Islands       

 

QUIET CONDITIONS CONTINUE IN GLOBAL SEISMICITY

 

EARTHQUAKE SUMMARY FOR FEBRUARY 10, 2020

 

It was a quiet day in global seismicity. No earthquakes were recorded with M>5.0. The strongest earthquake of the day was an aftershock in the South Sandwich Islands of M 5.0. This follows an M 6.1 mainshock of February 8. Other moderate quakes of M 4.8-4.9 also occurred in the Andaman Islands, India; the Dodecanese Islands, Greece and off eastern Honshu, Japan.

 

O: 10FEB2020 19:52:09  60.4S   25.7W ML=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  6FEB2020 121877    60.0S   26.0W 4.0-5.5 BAAAA  So. Sandwich Islands       

 

O: 10FEB2020 18:20:10  13.1N   93.3E mb=4.9  EMSC   ANDAMAN ISLANDS, INDIA REGION

P:  9FEB2020 121679    11.0N   95.0E 4.0-5.3 ACBAA  Andaman Islands            

 

O: 10FEB2020 22:46:55  35.1N   28.0E mb=4.8  EMSC   DODECANESE ISLANDS, GREECE   

P: 10FEB2020 121765    36.0N   28.0E 3.5-5.1 AAAAA  Turkey                     

 

O: 10FEB2020 10:11:04  36.4N  144.1E mb=4.8  EMSC   OFF EAST COAST OF HONSHU, JAPA

P: 11FEB2020 121743    36.0N  142.0E 4.0-5.3 AABAA  Off East Coast Honshu      

 

The lull in global seismicity over the past several days is probably related to the supermoon full moon of January 9. During a full moon the sun and moon are on opposite sides of the earth and the tidal effects from each is approximately cancelled out. This results in little tidal triggering and often in a period of quiet seismicity in the earth. This summary noted this possibility in the tidal triggering forecast for this full moon as:

 

"The full moon arrived on February 9, 2020 at 07:33 UT. Longitudes which were at local solar midnight at this time (sub-lunar) are near 115 West longitude while those which are sub-solar at the time of the full moon are near 65 East longitude. These include the western U.S. and Canada including Baja California, California, Nevada and the Pacific Northwest in the west and central Asia - Hindu Kush, Pakistan and Iran in the east. While tidal stresses are highest in these regions, and most likely to promote seismicity, enhanced seismicity is not expected world-wide in the next week. This is a supermoon when the moon is nearest the earth and tidal stresses are greatest. Other super moons will occur on March 9 as well as in early April and early May. Global seismicity is likely to be reduced  during this period when tidal stresses from the sun an moon are approximately cancelled." (January 10, 2020)

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Alaska Peninsula. It was not reported felt in this remote area. The last earthquake of M>=4.2 within about 150 km of this epicenter was an M 4.6 on November 19, 2019. Forecast 121818 had expected today's activity to the southwest around February 8. This may be related to the M 5.5 south of Africa which occurred yesterday and had been noted in this summary as:

 

 

"At high southern latitudes which have seen earthquakes of M 5.5 and 6.2 in the

Drake Passage and South Sandwich Islands in the past two days, an M 5.1 was located south of Africa. The last events in the area within about 400 km of this epicenter occurred on January 10, 2020 (M 5.4) and August 22, 2018 (M 5.6).

The antipode of this epicenter is located in the region of the Alaska Peninsula at 53N 153W - an area of limited seismicity. Little effect on the seismicity of that region is expected." (January 9-10, 2020)

 

O: 10FEB2020 20:37:20  55.4N  157.1W mb=4.2  EMSC   ALASKA PENINSULA             

P:  8FEB2020 121818    54.2N  162.5W 3.5-5.0 ABCAA  Unimak Islands, Aleutians  

 

An unusual earthquake of M 2.3 in the Channel Islands region of southern California occurred today. The last such earthquake within about 50 km of this epicenter occurred as an M 2.5 on November 18, 2019. Forecast 121753 had expected activity in this area around February 10. Earthquakes in this area occasionally precede stronger activity nearer Los Angeles to the north.

 

O: 11FEB2020 06:26:19  33.6N  119.0W Ml=2.3  EMSC   CHANNEL ISLANDS REG., CALIFORN

P: 10FEB2020 121753    34.0N  118.7W 2.5-4.3 AAAAA  So. California             

 

HIGH LATITUDE SEISMICITY ENHANCEMENT CONTINUES

 

EARTHQUAKE SUMMARY FOR FEBRUARY 9, 2020

 

The enhancement of seismicity at high latitudes and near the geomagnetic equator continued for the third straight day today. In the north an M 5.0 was located in the Arctic Ocean north of Svalbard. It was not reported felt in this remote area. This is an active area at magnitudes of M 5.0-5.2 with five events of this magnitude in the past 10 years. The largest event in the past 20 years was an M 6.4-6.5 on March 6, 2009.

 

O:  9FEB2020 13:32:52  81.2N    4.0W mb=5.0  EMSC   NORTH OF SVALBARD            

 

At high southern latitudes which have seen earthquakes of M 5.5 and 6.2 in the

Drake Passage and South Sandwich Islands in the past two days, an M 5.1 was located south of Africa. The last events in the area within about 400 km of this epicenter occurred on January 10, 2020 (M 5.4) and August 22, 2018 (M 5.6). The antipode of this epicenter is located in the region of the Alaska Peninsula at 53N 153W - an area of limited seismicity. Little effect on the seismicity of that region is expected. A major earthquake did occur northeast of this in the Gulf of Alaska on January 23, 2018 (M 7.9) and aftershocks in the area may be enhanced in coming days. An M 5.1 aftershock shook the area of the Gulf of Alaska on January 31, 2020 - the largest in more than a year.

 

 

O:  9FEB2020 07:05:40  52.8S   27.5E mb=5.1  EMSC   SOUTH OF AFRICA              

 

Moderate to strong seismicity also continued near the geomagnetic equator today.

An M 5.4 was located in the Bismarck Sea of Indonesia. This general region has seen large earthquake in Java and New Britain in early February. Earthquakes in the Bismarck Sea in the past year of M>=5.4 occurred on December 3 (M 5.6); July 15 (M 6.2) and May 15, 2019 (M 5.5). Forecast 121666 had expected today's activity in early February.

 

O:  9FEB2020 09:42:25   4.6S  149.4E Mw=5.4  EMSC   BISMARCK SEA                 

P:  4FEB2020 121666     4.0S  152.0E 4.0-5.3 BACAA  New Britain                

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 near Watson Lake, Yukon Territory, Canada. It was reported lightly felt in the epicentral area east of the Alaskan border. The only events of M>=4.5 within about 200 km of this epicenter in the past 30 years were an M 4.9 on August 11, 2001 and M 5.0 on May 12, 1999. Forecast 121831 had expected today's event was likely to the north around February 9.

 

O:  9FEB2020 23:12:10  60.7N  129.6W Mw=4.1  EMSC   SOUTHERN YUKON TERRITORY, CANA

O:  9FEB2020 23:12:12  60.7N  129.6W MB=4.5  ECAN of Watson Lake, YT             

P:  9FEB2020 121831    63.0N  130.0W 2.5-3.9 ACAAA  Yukon Territory, Canada    

 

There were no moderate earthquakes of M>=3 in Hawaii today, but the region was by no means quiet. A series of events of M>=2 were recorded. Hawaii lies at 120 degrees (node 3) and at 72 degrees from the M 6.8 in eastern Turkey of January 24 and (node 5) from the M 7.7 south of Cuba of January 28 and became active shortly after those events. This activity may precede another volcanic activity on the island. Forecast 121707 had expected this activity in early February.

 

O:  9FEB2020 07:15:07  19.2N  155.4W Md=2.2  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7FEB2020 121707    19.3N  155.6W 4.0-5.3 AAAAA  Hawaii area                

 

GEOMAGNETIC STORM CONTINUES TO EXCITE LOW AND HIGH LATITUDE SEISMICITY

 

EARTHQUAKE SUMMARY FOR FEBRUARY 8, 2020

 

The geomagnetic storm of the past two days, the strongest in a month continued to be associated with high latitude earthquakes and with earthquakes near the geomagnetic equator. These included an M 6.1 in the South Sandwich Islands of the South Atlantic and an M 6.2 in New Britain, PNG. This summary had expected this activity in the previous summary as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 15.  High latitude geomagnetic field also saw active conditions  with AP at 18. This continues the strongest geomagnetic disturbance in the past month - since AP reached 12 on January 9. Seismicity at high latitudes and about 10 degrees from the geomagnetic equator will likely be enhanced over the next four days." (February 7-8, 2020)

 

The strongest earthquake in the world today was an M 6.2 near the geomagnetic equator in New Britain, PNG. NEIC reported it was felt with maximum intensity IV in Kokopo and Kinbe and III in Rabaul, East New Britain. An M 7.5 occurred in the New Britain area about 200 km northeast of today's epicenter on May 14, 2019 but the last of equal or stronger magnitude within about 150 km was an M 6.2 on October 10, 2018. Forecast 121666 had expected today's event was likely within this area around February 4-5.

 

O:  9FEB2020 06:04:32   5.5S  152.1E Mw=6.2  EMSC   NEW BRITAIN REGION, P.N.G.   

P:  4FEB2020 121666     4.0S  152.0E 4.0-5.3 BBAAA  New Britain                

P:  5FEB2020 121666     5.0S  154.0E 4.0-5.3 BABAA  New Britain                

 

An M 6.1 also occurred today in the South Sandwich Islands region of the South Atlantic. It was not reported felt in this remote area. An M 6.1 also hit about 150 km northwest of this epicenter on January 20, 2020 but the last within about 200 km of today's event in the southern South Sandwich Islands occurred as an M 6.6 on August 27, 2019. Today's event may be an aftershock of that. Today's earthquake was accompanied by aftershocks of M 4.8, 4.8 and 5.1. It occurred near local solar noon and may have also been promoted by strong tidal stresses associated with the super-full moon of February 9 as noted in previous issues of this summary:

 

"The full moon arrived on February 9, 2020 at 07:33 UT. Longitudes which were at local solar midnight at this time (sub-lunar) are near 115 West longitude while those which are sub-solar at the time of the full moon are near 65 East longitude. These include the western U.S. and Canada including Baja California, California, Nevada and the Pacific Northwest in the west and central Asia - Hindu Kush, Pakistan and Iran in the east. While tidal stresses are highest in these regions, and most likely to promote seismicity, enhanced seismicity is expected world-wide in the next week. This is a supermoon when the moon is nearest the earth and tidal stresses are greatest. Other super moons will occur on March 9 as well as in early April and early May. Global seismicity is likely to be enhanced during this period." (February 6-8, 2020)

 

Forecast 121877 had expected today's event within about 25 km of the epicenter was likely around February 6. It occurred at the fourth node (90 degrees) from the M 7.7 earthquake of January 28 south of Cuba and was probably promoted fromo that source.

 

O: 08FEB2020 16:16:55  59.9S   25.7W mb=4.8  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 08FEB2020 16:06:17  60.3S   24.7W mb=4.8  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 08FEB2020 18:25:58  60.5S   24.5W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

O:  8FEB2020 14:32:58  59.8S   25.8W Mw=6.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  6FEB2020 121877    60.0S   26.0W 4.0-5.5 AAAAA  So. Sandwich Islands       

 

A moderate earthquake of M 4.7 occurred today off the coast of Oregon. NEIC reported it may have been felt with intensity II in Reedsport and Clatskanie, Oregon. The last earthquake within about 150 km of this epicenter off the coast of Oregon with M>=4.7 was an M 4.7 on October 17, 2019. A series of moderate events beginning with M 5.4 on June 22, 2019 occurred at the activation of the area in June to July, 2019. Forecast 121794 had expected today's event in this region was likely around February 11.

 

O:  8FEB2020 15:34:56  43.4N  126.9W mb=4.7  EMSC   OFF COAST OF OREGON          

P: 11FEB2020 121794    42.1N  126.9W 3.0-4.4 BBAAA  Off Coast of Oregon        

 

The largest earthquake in the U.S. or Canada today was an M 3.9-4.0 in southern California near Barstow. NEIC reported maximum intensity IV at Newberry Springs and II-III in Barstow, Daggett, Hinkley, Fort Irwin, Helendale, Apple Valley, Lucerne Valley, Boron and Victorville. NEIC reported the aftershock of M 2.6 in Southern California  was felt with intensity IV in the area(s) of Southern California at Barstow.  This appears to be an aftershock of the M 4.6 near Barstow of January 25, 2020. A similar M 4.0 occurred a year ago to the southeast of this on February 7, 2019. In the previous issue of this summary it had been noted that a moderate event in  southern California was possible at this time as:

 

"Some seismicity in the western U.S. has been associated with the M 7.7 in

Cuba of January 28. Unusual moderate events in the Mammoth Lakes area and

other areas of California suggest some triggering at this time. The region of

Southern California is at the 7th node (51 degrees) from Cuba and could

be a site of an upcoming moderate event." (February 6-7, 2020)

 

Forecast 121757 had expected today's event within about 10 km was likely in early February. This epicenter is at 103 degrees from the M 6.8 in Turkey of January 24 and may have been promoted by energy from that event.

 

O:  9FEB2020 02:51:42  35.1N  117.0W ML=2.5  EMSC   SOUTHERN CALIFORNIA          

O:  8FEB2020 19:34:19  35.1N  117.0W Mw=3.9  EMSC   SOUTHERN CALIFORNIA          

O:  8FEB2020 19:34:19  35.1N  117.0W Mw=4.0  ANSS   SOUTHERN CALIFORNIA          

P:  3FEB2020 121757    35.1N  117.0W 2.5-4.3 BAAAA  So. California             

 

SEISMICITY UP AT HIGH; LOW LATITUDES WITH GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR FEBRUARY 7, 2020

 

 

The strongest earthquake in the world today was an M 5.5 in the Drake Passage south of South America. This is the strongest earthquake in this remote area within about 400 km of this epicenter since an M 5.6 on August 27, 2018 and prior to that an M 6.6 and 5.6 on January 15 and 17, 2012. This may have been promoted by the current geomagnetic storm which, as noted, in the previous issue of this summary could have enhanced seismicity in the region of high latitudes as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 15.  High latitude geomagnetic field also saw active conditions  with AP at 20. This is the strongest geomagnetic disturbance in the past month - since AP reached 12 on January 9. Seismicity at high latitudes and about 10 degrees from the geomagnetic equator will likely be enhanced over the next four days." (February 6-7, 2020)

 

This epicenter is 106 degrees from the M 7.1 in Southern California of July 6, 2019 and may have been disturbed by energy from that source.

 

O:  7FEB2020 18:52:51  59.4S   60.1W Mw=5.5  EMSC   DRAKE PASSAGE                

 

The strongest earthquake ever observed in the in the Drake Passage or South Shetland Islands occurred 49 years ago on February 8, 1971 and was followed within a day by the San Fernando Valley earthquake of M 6.7 in Southern California. It was felt in the Argentine Islands. Crevasses were formed in the Argentine Islands.

 

Other moderate seismicity at high latitudes occurred in the Macquarie Island region south of New Zealand with M 5.0.

 

O:  7FEB2020 08:20:14  50.1S  161.9E mb=5.0  EMSC   NORTH OF MACQUARIE ISLAND    

 

An earthquake of M 5.5 was also felt in the area of Seram, Indonesia today.

It was accompanied by a series of moderate aftershocks. An earthquake of M 6.5 hit west of this on September 25, 2019 and today's events may be regional aftershocks of that event. Forecast 121678 had expected activity in the region around February 11.

 

O: 07FEB2020 14:53:34   2.3S  138.4E ML=4.3  EMSC   PAPUA, INDONESIA

O: 08FEB2020 06:56:45   2.8S  130.0E ML=4.4  EMSC   SERAM, INDONESIA

O: 08FEB2020 06:36:46   3.0S  129.9E Mw=5.5  EMSC   SERAM, INDONESIA

O:  8FEB2020 06:51:40   3.0S  129.9E mb=4.9  EMSC   SERAM, INDONESIA             

P: 11FEB2020 121678     6.0S  130.0E 4.0-5.3 BCAAA  West Irian, PNG            

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in the Fox Islands, Alaska. It was not reported felt in this remote area. The last earthquake in the Fox Islands of equal or larger magnitude within about 150 km of this epicenter was an M 4.0 on January 18, 2020. Forecasts 121808 and 121811 had expected today's activity within this area around February 11.

 

O:  7FEB2020 18:30:16  51.6N  171.1W ml=3.8  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  6FEB2020 121811    51.9N  169.2W 3.5-4.8 AABAA  Fox Islands, Aleutians     

P: 11FEB2020 121808    52.3N  170.1W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

 

An unusual earthquake of M 3.0 shook the area of northern Kansas and Southern Nebraska today. NEIC reported this earthquake of M 3.0 in Northern Kansas  was felt with intensity II-III in the area(s) of Northern Kansas at Burr Oak and Mankato and in Nebraska at Red Cloud and Beatrice. This is the strongest event in the area within about 100 km of this epicenter since a series of M 3.5-3.7 events in early April and early June, 2017. Note that the area of Oklahoma and Kansas often sees enhanced seismicity at times of full and new moons and may see a moderate quake in the next several days. Forecast 121764 had expected regional seismicity around February 4.

 

This epicenter is on the edge of Nebraska which often sees enhanced seismicity prior to moderate events along the western edge of the North American tectonic plate. Other factors also suggest a moderate upcoming event in this region – including the strong nor'easter which has just concluded in the northeast U.S. and a similar earthquake north of this epicenter earlier in January. Some seismicity in the western U.S. has been associated with the M 7.7 in Cuba of January 28. Unusual moderate events in the Mammoth Lakes area and other areas of California suggest some triggering at this time. The region of Southern California is at the 7th node (51 degrees) from Cuba and could be a site of an upcoming moderate event.

 

O:  8FEB2020 05:37:37  39.9N   98.3W mb=3.0  EMSC   KANSAS                       

P:  4FEB2020 121764    38.0N   99.0W 2.0-3.8 BBAAA  Southern Plains            

 

 

STRONG M 6.0 SHAKES MINDANAO, PHILIPPINES

 

EARTHQUAKE SUMMARY FOR FEBRUARY 6, 2020

 

The strongest earthquake in the world today was an M 6.0 in Mindanao, Philippines. NEIC reported this earthquake of M 6.0 in Mindanao, Philippines  was felt with intensity II-III in the area(s) of Mindanao, Philippines at Pundaguitan (VII) and Digos, Davao, Bato and San Isidro. It was preceded by an M 3.6 about two hours earlier to the southeast and followed by a series of moderate aftershocks. The Mindanao area has been active over the past several months with events of M>=6 on October 29 and 31 (M 6.6, 6.5) and December 15, 2019 (M 6.8) about 200 km to the northwest of today's epicenter. The last nearer to today's event occurred as an M 6.2 on September 29, 2019. Forecast 121656 had expected today's activity was likely around February 5.  Today's M 6.0 is located at 144 degrees from the M 7.7 in Cuba of January 28. This is a distance at which strong concentration of seismic energy occurs at the surface following major earthquakes and probably helped promote today's Mindanao event.

 

O: 06FEB2020 14:20:46   5.4N  126.4E mb=4.8  EMSC   MINDANAO, PHILIPPINES

O: 06FEB2020 13:45:38   5.4N  126.5E ML=4.6  EMSC   MINDANAO, PHILIPPINES

O: 06FEB2020 18:27:22   5.5N  126.4E mb=4.7  EMSC   MINDANAO, PHILIPPINES

O: 06FEB2020 13:40:05   5.5N  126.6E Mw=6.0  EMSC   MINDANAO, PHILIPPINES

O: 06FEB2020 11:47:59   6.5N  125.3E ML=3.6  EMSC   MINDANAO, PHILIPPINES

O:  7FEB2020 02:03:37   5.3N  126.4E mb=4.6  EMSC   MINDANAO, PHILIPPINES        

P:  5FEB2020 121656     6.0N  125.0E 4.0-5.3 AAAAA  Mindanao, Philippines      

 

The largest earthquake in the U.S. or Canada today was an M 4.4 in the Unimak Island area of the Alaska Peninsula, Alaska. It was note reported felt in this remote area. This is the strongest event in the Unimak area of Alaska within about 150 km of this epicenter since an M 4.4 on October 26, 2019. The area was also active during the activation of Alaska in early July, 2019 with events of  M 4.4 and 4.5. Forecast 121818 had expected today's event within about 25 km of the epicenter was likely around February 6.

 

O:  6FEB2020 08:24:29  54.5N  161.4W mb=4.4  EMSC   ALASKA PENINSULA             

P:  6FEB2020 121818    54.3N  161.4W 3.5-5.1 AAAAA  Unimak Islands, Aleutians  

 

The strongest earthquake in the U.S. or Canada outside Alaska today was an M 3.4-3.8 off the coast of northern California. NEIC reported it was felt with intensity II-III in Petrolia, Fortuna, Garberville, Piercy and Fort Bragg, California. NEIC reported the earthquake of M 2.5 offshore Northern California  was felt with intensity II-III in the area(s) of Northern California in Manchester, Elk and Point Arena. Recent activity in this area off the coast of Northern California at this magnitude level has included events of M 4.1 on December 19, 2019 and an M 3.4 on October 31, 2019. The last moderate event in the region occurred with the regional activation of late June and early July as an M 5.6 on June 23, 2019. Today's activity is probably aftershocks of that  event. Forecast 121793 had expected today's activity within about 50 km of these epicenters was likely around February 7. The mainshock occurred within minutes of local solar midnight and was probably enhanced by tidal stresses associated with the upcoming full moon as noted in previous issues of this summary:

 

 

"The full moon will arrive on February 9, 2020 at 07:33 UT. Longitudes which are at local solar midnight at this time (sub-lunar) are near 115 West longitude while those which are sub-solar at the time of the full moon are near 65 East longitude. These include the western U.S. and Canada including Baja California, California, Nevada and the Pacific Northwest in the west and central Asia - Hindu Kush, Pakistan and Iran in the east. While tidal stresses are highest in these regions, and most likely to promote seismicity, enhanced seismicity is expected world-wide in the next week. This is a supermoon when the moon is nearest the earth and tidal stresses are greatest. Other super moons will occur on March 9 as well as in early April and early May. Global seismicity is likely to be enhanced during this period." (February 5-6, 2020)

 

These events are at 100-103 degrees from Mindanao, the M 6.8 in Turkey of January 24, 2020  and the M 7.1 in Molucca of November 14, 2019 and were probably promoted by the recent strong events in those regions.

 

O: 07FEB2020 00:53:15  40.3N  124.4W ML=2.7  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 06FEB2020 11:21:08  40.3N  124.4W Md=2.1  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 06FEB2020 10:00:08  40.3N  124.4W Md=2.5  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 06FEB2020 11:05:29  40.3N  124.4W Ml=3.1  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 07FEB2020 01:17:06  40.4N  124.3W Md=2.2  EMSC   NORTHERN CALIFORNIA

O:  6FEB2020 08:20:19  40.2N  124.8W ML=3.4  EMSC   OFFSHORE NORTHERN CALIFORNIA 

O:  6FEB2020 08:20:24  40.3N  124.4W ML=3.8  ANSS   OFFSHORE NORTHERN CALIFORNIA 

P:  7FEB2020 121793    40.7N  124.6W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

Moderate activity in eastern Europe and northeast Africa today continued the activation of this area which began with the M 6.8 in Turkey of January 24. Moderate quakes today occurred in Crete (M 4.7, 4.4 and 4.1) and in Central Greece (M 5.1, 3.9, 4.2). An earthquake of M 5.7 about 150 km to the southeast of today's event occurred along with an M 5.5 and 5.6 on January 28-30, 2020. The last similar or larger event in Crete within about 150 km of today's epicenter occurred as an M 5.4 on December 10, 2019 and prior to that an M 6.0 on November 27, 2019. Forecast 121715 had expected today's activity was likely within about 100 km around February 7. Much of today's activity in eastern Europe continues at about 103 degrees from the Ridgecrest, California event of July 6, 2019 and by earthquakes in the Philippines and Molucca area of Indonesia. The area is also at the fourth node (90 degrees) from the M 7.7 in Cuba of January 28 and may have been promoted from that source.

 

O: 07FEB2020 03:11:47  34.9N   26.5E mb=4.7  EMSC   CRETE, GREECE

O: 07FEB2020 02:23:58  34.9N   26.6E mb=4.4  EMSC   CRETE, GREECE

O:  7FEB2020 02:16:02  35.0N   26.6E mb=4.1  EMSC   CRETE, GREECE                

P:  7FEB2020 121715    35.0N   25.0E 3.0-4.4 AAAAA  Aegean Sea                 

 

The M 5.1 in Greece follows an M 5.0 about 150 km southwest of that epicenter which occurred on January 19. Forecast 121799 had expected today's activity in the area around February 6.

 

NEIC reported this earthquake of M 5.2 in Greece  was felt with intensity II-III in the area(s) of Greece at Megala Kalivia, Ioannina and Volos.

 

O: 06FEB2020 18:06:53  38.1N   22.3E mb=4.2  EMSC   GREECE

O:  7FEB2020 04:45:37  38.1N   22.2E ML=3.9  EMSC   GREECE                       

O:  6FEB2020 09:24:14  39.2N   21.4E mb=5.1  EMSC   GREECE                        

P:  6FEB2020 121799    40.0N   25.0E 3.0-4.9 AACAA  Romania/NW Turkey          

 

The most unusual earthquake in the area today was an M 4.6 in the Red Sea. This follows an M 4.0 in the Dead Sea to the north yesterday. The last earthquake within about 200 km of this epicenter in the Red Sea of M>=4.6 occurred as an M 4.9 on September 11, 2019 and prior to that an M 4.6 on March 10, 2019. Forecasts 121685 and 121461 had expected this activity in this area in late January or early February.

 

O:  7FEB2020 04:48:37  17.7N   40.1E mb=4.6  EMSC   RED SEA                      

P:  7FEB2020 121685    13.0N   40.0E 3.5-4.9 ACAAA  Ethiopia                   

P: 31JAN2020 121461    19.0N   39.0E 3.0-4.8 CBAAA  Sudan                      

 

An M 4.6 was lightly felt in the Leeward Islands at Guadeloupe today. This is the largest earthquake in the Guadeloupe area within about 150 km of this epicenter since an M 4.8 on December 27, 2019 and an M 4.7 on July 25, 2019 and April 17, 2018. Forecast 121688 had expected this event within this area was likely around February 10. It may have been promoted by antipodal effects from  Tropical Cyclone Damien which passed over the antipode of this earthquake a day ago as noted in this summary:

 

"Tropical cyclone Damien (14S) continued off northwestern Australia today with winds of 80 kts.  It is near-antipodal to northern Caribbean and Puerto Rico and may have helped promote the activity in Puerto Rico today due to antipodal focusing effects. In the region, enhanced seismicity in Java to Sumbawa, Indonesia is likely in the next several days due to stresses from this storm." (February 5-6, 2020)

 

O:  6FEB2020 21:10:53  16.7N   61.0W mb=4.6  EMSC   GUADELOUPE REGION, LEEWARD ISL

P: 10FEB2020 121688    17.0N   60.0W 3.0-4.9 BAAAA  Leeward Islands            

 

UNUSUAL MALDIVE ISLANDS EARTHQUAKE COULD SPELL TROUBLE

 

EARTHQUAKE SUMMARY FOR FEBRUARY 5, 2020

 

An unusual M 4.5 occurred in the Maldive Islands today. NEIC reported it was felt with intensity II in the Maldives at Kulhudhuffushi, Haa, Feydhoo, Goidhoo, Firubaidhoo. The Maldive Islands, located south of India, lie at an elevation near sea level. As such, they are greatly impacted by changes in sea level compared to Island surface. They were inundated, for example, during the December 26, 2004 Indian Ocean-wide tsunami. Subsidence-related seismicity in the area could be a major problem for this island nation. This epicenter is at 142 degrees from the M 7.7 south of Cuba of January 28, a distance at which seismic energy concentrates at the surface of the earth and may have been promoted by energy from that event. It is the largest earthquake in the region of the Maldive Islands within about 250 km in  at least 30 years. An event of M 4.9 occurred about 400 km southeast of this on October 11, 2016 and an M 4.8 on January 27, 2001 was about 500 km southeast of this epicenter.

 

O:  5FEB2020 20:47:08   7.3N   73.7E mb=4.5  EMSC   MALDIVE ISLANDS REGION       

 

The strongest earthquake in the world today was an M 6.2 north of Java, Indonesia. NEIC reported it was felt with intensity II-III in Java at Lasem, Madiun, Semarang and in Bali at Tabanan, Ubud, Denpasar and Kuta Bali. This is the strongest earthquake north of Java within about 250 km of this epicenters since an M 6.2 on September 19, 2019 and priorf to that an M 6.3 on May 26, 2006. The strongest event in the area in the past 30 years was an M 6.7 on September 2, 1992. Forecast 121433 had expected today's event was possible to the southeast in early February. This epicenter is near the antipode of the M 7.7 in Cuba of January 28 and is the first strong earthquake in the world since that time. It may have been promoted by energy from that event. It is also near the position of Tropical Cyclone 14S which may also have promoted regional seismicity at this time as noted in this summary:

 

“Tropical cyclone 14S formed off northwestern Australia today with winds of 45 kts.  It is near-antipodal to northern Caribbean and Puerto Rico and may have helped promote the activity in Puerto Rico today due to antipodal focusing effects. Regional seismicity to the north in the area of Java to Sumbawa, Indonesia is also likely to be enhanced.” (February 5, 2020)

 

O:  5FEB2020 18:12:37   6.1S  113.1E Mw=6.2  EMSC   JAVA, INDONESIA              

O:  5FEB2020 18:34:39   6.7S  113.1E ML=4.2  EMSC   JAVA, INDONESIA              

P:  1FEB2020 121433     8.0S  117.0E 4.0-5.3 BBCAA  Sumbawa Island area        

 

A moderately large earthquake of M 5.8 also occurred south of New Zealand in the Macquarie Island region. This epicenter is antipodal to the Reykjanes Ridge in the north Atlantic where some antipodal-related seismicity is possible in the next several days. At M 5.8 this is the strongest event within about 400 km of this epicenter since a similar M 5.8 on March 1, 2019. The last such event of larger magnitude was an M 6.1 on September 8, 2016.

 

O:  5FEB2020 12:17:05  54.6S  158.8E Mw=5.8  EMSC   MACQUARIE ISLAND REGION      

 

The strongest earthquake in the U.S. or Canada today was an M 3.6 in the Andreanof Islands, Aleutians, Alaska. It was not reported felt. This continues recent activity in this area and is not unexpected. Forecast 121807 had expected this event within about 100 km around February 6.

 

O:  5FEB2020 23:35:08  51.2N  176.1W ml=3.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6FEB2020 121807    50.3N  176.2W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

 

The strongest earthquake in North America today was an M 5.1 in the Revilla Gigedo Islands of Mexico. It was not reported felt in this remote area. It is the strongest event within about 200 km of this epicenter since an M 5.8 on August 14, 2019 and prior to that an M 5.6 on November 27, 2018. The area had been quiet at this magnitude level from 2013 through 2018. Forecast 121684 had expected this event was likely within about 100 km of this epicenter around February 11. In the previous issue of this summary, it had been noted that this epicenter is near the antipode of Tropical Cyclone Francisco and could see antipodal promotion at this time as:

 

"A tropical cyclone may also be forming in the South Indian Ocean. This system is located at 16S 66E with winds up to 45 kts and moving to the south at 14 kts. The antipode is south of the Gulf of California where some sympathetic seismicity may be enhanced as this system is in the area. Later it will move to the south, perhaps affecting Baja and Southern California about the time of the full moon." (February 5, 2020)

 

O:  5FEB2020 10:43:06  19.9N  109.3W Mw=5.1  EMSC   REVILLA GIGEDO ISLANDS REGION

P: 11FEB2020 121684    19.0N  109.0W 3.5-5.1 CAAAA  Coast of Jalisco, Mexico   

 

MODERATE QUAKE SHAKES NORTH ISLAND, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR FEBRUARY 4, 2020

 

The strongest earthquake in the world today was an M 5.2-5.5 north of North Island, New Zealand. NEIC reported it was felt with maximum intensity IV in New Zealand at Waiouru and II-III in Tauranga, Bay of Plenty, Whangamata, Waikato, Gisborne, Napier, Hawke's Bay and Palmerston North, North Island. GEONET reported this earthquake was felt with light intensity in the area of northern North Island,  New Zealand. 11282 persons reported feeling this earthquake with 7560 light shaking; 3425 with light intensity; 276 with moderate intensity 12 with strong shaking; 0 with severe and 9 with extreme shaking in North Island, New Zealand. The last earthquake of larger magnitude in the region was an M 5.8 on November 23, 2019 which may have led to the deadly eruption on White Islands days later. Prior to that the most active period in the area had been in early September 2016.  Forecast 121865 had expected this area would be active in early February. This activity is located at 146 degrees from the M 6.8 in Turkey of January 24 and may have been promoted by energy from this source.

 

O:  4FEB2020 09:47:23  37.7S  176.5E mb=5.2  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 04FEB2020 09:47:26  37.6S  176.6E ML=5.5  GEONET Felt with light intensity

P:  7FEB2020 121865    39.0S  178.0E 3.0-4.4 BBAAA  North Island, N.Z.         

 

Moderate seismicity returned to southern Puerto Rico today. The strongest event in the aftershock zone of the M 6.5 of January 7, 2020 was an M 5.0-5.2. It was reported by NEIC to have been felt with maximum intensity IV in Puerto Rico at Penuelas, San Sebastian, Ciales, Hatillo and II-III in Yauco, Juana Diaz, Lares, Moca and Aguada and throughout most of Puerto Rico. Aftershocks, including an M 4.0 were felt with intensity II-III in Corozal, Puerto Rico. Following is a listing of events of M>=4.0 in the region of southern Puerto Rico that occurred today (M>=3 are listed in the "AMERICA" section below). Forecast 121699 had expected today's activity was likely around February 4.

 

O: 04FEB2020 19:53:15  17.8N   66.9W Mw=4.2  EMSC   PUERTO RICO REGION

O: 04FEB2020 17:29:26  17.8N   66.9W mb=4.4  EMSC   PUERTO RICO REGION

O: 04FEB2020 14:45:55  17.9N   66.8W mb=5.1  EMSC   PUERTO RICO REGION

O:  4FEB2020 15:12:10  17.7N   66.8W ML=4.0  EMSC   PUERTO RICO REGION           

P:  4FEB2020 121699    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

 

Earthquakes of M 4.6 and 4.9 occurred in western Turkey today, part of an aftershock sequence which has continued in the area for about a week. Today's activity was felt with intensity II-III in Turkey at Balikesir, Izmir, Bursa, Yakuplu, Istanbul, Corlu and in Orestias, Greece. The M 4.8 was preceded by an M 4.5 foreshock. This series began shortly before the M 6.8 in eastern Turkey on January 24 with an M 5.6 on  January 22 and may have been promoted be stress redistribution after that event. Forecast 121533 expected today's activity was likely in late January or early February. This activity is at the fourth node (90 degrees) from the M 7.7 south of Cuba  of January 28 and may have been promoted by energy from that source.

 

O: 04FEB2020 08:43:16  39.0N   27.9E ML=4.1  EMSC   WESTERN TURKEY

O: 04FEB2020 16:47:09  39.0N   27.9E ML=4.5  EMSC   WESTERN TURKEY

O:  4FEB2020 17:55:23  39.0N   27.8E mb=4.8  EMSC   WESTERN TURKEY               

P: 29JAN2020 121533    39.0N   28.0E 3.5-4.8 BAAAA  Turkey                     

 

The strongest earthquake in the U.S. or Canada today was an M 5.3 in the Rat Islands, Aleutians, Alaska. It was not reported felt in this region. This extends the current activity in the Andreanof Islands to the west. It is the strongest earthquake in the Rat Islands since an M 5.3 on April 14, 2019 - an aftershock of an M 6.4 on April 2, 2019. Forecast 121815 had expected today's event within about 100 km of this epicenter was likely in early February.

 

O:  4FEB2020 22:17:45  51.9N  178.5E mb=5.3  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  8FEB2020 121815    51.0N  178.0E 4.0-5.5 BAAAA  Rat Islands                

 

A light swarm of minor earthquakes occurred in Southern California today. NEIC reported the earthquake of M 2.8 in Southern California  was felt with intensity II-III in the area(s) of Southern California at Lake Elsinore and in Yuma, Arizona. This activity was expected in forecast 121749 within about 25 km of these epicenter was likely around February 5. This activity is located at 104 degrees from the M 6.8 in Turkey of January 24 and may have been promoted by energy from this source.

 

O: 04FEB2020 13:15:47  33.2N  115.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 04FEB2020 11:59:54  33.2N  115.6W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 04FEB2020 12:03:22  33.2N  115.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 04FEB2020 13:06:41  33.2N  115.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O:  4FEB2020 13:03:32  33.2N  115.6W ML=2.8  EMSC   SOUTHERN CALIFORNIA          

P:  5FEB2020 121749    32.9N  115.6W 2.5-4.3 AAAAA  So. California             

 

Seismicity in the region of Taal Volcano near Manila, Philippines resumed today.

This may lead to another eruptive episode at that volcano. Forecast 121448 had expected this activity at the end of January or in early February.

 

O:  4FEB2020 20:37:00  13.5N  120.9E ML=3.6  EMSC   MINDORO, PHILIPPINES         

O:  4FEB2020 13:56:12  14.3N  120.4E ML=3.5  EMSC   LUZON, PHILIPPINES           

P: 28JAN2020 121448    14.0N  120.0E 3.5-4.8 CAAAA  Luzon, Philippines         

 

VOLCANIC AREAS AT NODAL DISTANCES FROM CUBA CONTINUE ACTIVE

 

EARTHQUAKE SUMMARY FOR FEBRUARY 2, 2020

 

Areas of the world with high heat flow and at nodal distances from the M 7.7 south of Cuba of January 28, 2020 continued to display enhanced seismicity today. These include areas of New Guinea (144 degrees, node 5); Volcano Islands (120 degrees, node 3); Iceland (60 degrees, node 6), Mammoth Lakes, California (40 degrees node 9), Nevada (36 degrees node 10), southern Alaska and Hawaii (72 degrees, node 5). Enhanced motions of the earth's surface at these distances (360/n, where n is a small integer) may be bringing on this seismicity.

 

An M 4.2 in Hawaii today continued the enhancement of seismicity in the area which began after the M 7.7 south of Cuba of January 28, 2020. NEIC reported today's event was felt throughout Hawaii with intensity II-III in Hawaii National Park, Volcano, Pahoa, Mountain View, Kurtistown, Pahala, Keaau, Hilo, Papaikou and Pepeekeo, Hawaii. This follows an M 3.8 on January 29, 2020.  The last such event of M>=4.2 in the region occurred on November 11, 2019 with M 4.9. When the M 3.8 occurred on January 29, this summary noted:

 

"An M 3.8 in the Leilani Estates region of Hawaii today was widely felt. NEIC reported IV at Pahoa and II-III at Mountain View, Kurtistown, Volcano, Keaau, Hawaii National Park,  Hilo, Papaikou, Pepeeleo and Hakalau, Hawaii. This is the area where a strong eruption occurred in the summer of 2018 which stopped short on August 9, 2018. The only earthquake in the area of stronger magnitude since then was an M 5.5 on March 13, 2019 about 25 km west of today's epicenter. Forecast 121467 had expected today's event was likely within about 25 km of this epicenter around January 27. This epicenter is located at the fifth node (72 degrees) from the M 7.7 in Cuba of January 28 and was probably promoted from that source. If this is the case further seismicity and perhaps volcanism may follow in Hawaii.' (January 30, 2020)

 

O:  3FEB2020 06:37:10  19.3N  155.2W Ml=4.2  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JAN2020 121467    19.3N  155.3W 4.0-5.3 CAAAA  Hawaii area                

 

An M 4.4 also occurred near Redoubt Volcano, Alaska today. NEIC reported intensity II-III in Kasilof, Clam Gulch, Soldotna, Sterling, Kenai, Homer, and Anchorage, Alaska. The last earthquake within about 100 km of this epicenter was an M 4.8 on March 7, 2019 and February 1, 2019. Forecast 121590 had expected today's event at the end of January.

 

O:  2FEB2020 14:57:52  58.2N  156.0W mb=4.4  EMSC   ALASKA PENINSULA             

P: 24JAN2020 121590    60.0N  153.5W 3.2-4.9 CBBAA  Central Alaska             

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 south of Anchorage, Alaska. This is the strongest earthquake within about 100 km of this epicenter since the activation of early July, 2019 when quakes of M 4.6 and 4.7 occurred. Forecast 121591 had expected this activity was possibly around February 1.

 

O:  3FEB2020 04:49:07  60.6N  152.4W mb=4.6  EMSC   SOUTHERN ALASKA               

P: 24JAN2020 121590    60.0N  153.5W 3.2-4.9 CAAAA  Central Alaska             

P:  1FEB2020 121591    60.1N  150.6W 3.2-4.9 AAAAA  Central Alaska             

 

O:  2FEB2020 09:00:00  63.9N   22.4W ML=3.3  EMSC   ICELAND REGION               

 

An unusual earthquake of M 4.0 also shook the region of Southern Quebec, Canada today. This is the strongest earthquake within about 100 km of this epicenter since an M 4.1 October 1, 2007 and an M 4.5 on October 12, 2003. Forecast 121563 had expected a possible event southwest of this epicenter in late January.

 

O:  2FEB2020 20:05:32  47.5N   78.6W ML=4.0  EMSC   SOUTHERN QUEBEC, CANADA      

P: 25JAN2020 121563    46.0N   81.0W 2.0-3.8 CBBAA  Ohio/Lake Erie             

 

A pair of earthquakes of M 3.6 and M 3.7 in Nevada today were the strongest in California or Nevada.  NEIC reported these earthquakes of M 3.6 and 3.7 in Nevada  was felt with intensity II-III in the area(s) of Nevada at Pioche and Overton. The M 3.7 was felt with intensity VI in Caliente, Nevada and III in Pioche and Baker, Nevada.  These events area at the 10th node (36 degrees) from Cuba and are in the basin and range province of Nevada where heat flow is high. They were probably promoted by energy from the M 7.7 in Cuba of January 28.

Forecast 121499 had expected today's events about 50 km southwest of this epicenter was likely in early February.

 

O: 02FEB2020 19:50:54  37.8N  114.3W ML=2.6  EMSC   NEVADA

O: 02FEB2020 17:39:09  37.8N  114.3W ML=3.6  EMSC   NEVADA

O:  2FEB2020 17:34:29  37.8N  114.3W ML=3.7  EMSC   NEVADA                       

P:  1FEB2020 121499    37.3N  114.9W 2.5-4.3 AAAAA  Nevada area                

 

Seismicity also continued at enhances levels north of Puerto Rico and in southern Puerto Rico. The northern zone is now showing more seismicity than the southern zone and is not part of the aftershock sequence of the January 7, 2020 event of M 6.5. It is on the western boundary of the Puerto Rico Trench. A strong earthquake is overdue and potentially dangerous in the Puerto Rico Trench and may have been promoted by stress transfer from the M 6.5. Forecasts 121459 and 121458 had expected this activity in late January or early February.

 

O: 02FEB2020 09:15:51  19.0N   67.5W ML=3.4  EMSC   PUERTO RICO REGION

O: 02FEB2020 19:37:43  19.3N   66.0W ML=3.5  EMSC   PUERTO RICO REGION

O:  2FEB2020 22:29:41  18.7N   69.8W ML=3.4  EMSC   DOMINICAN REPUBLIC           

P: 31JAN2020 121459    19.0N   71.0W 3.4-4.8 AAAAA  Puerto Rico                

 

O: 03FEB2020 00:33:18  17.9N   66.7W ML=4.2  EMSC   PUERTO RICO REGION

O: 03FEB2020 05:02:12  17.9N   66.8W ML=4.0  EMSC   PUERTO RICO REGION

P: 29JAN2020 121458    18.0N   66.0W 3.4-4.9 BAAAA  Puerto Rico                

 

VOLCANIC AREAS AT NODAL DISTANCES FROM CUBA CONTINUE ACTIVE

 

EARTHQUAKE SUMMARY FOR FEBRUARY 2, 2020

 

Areas of the world with high heat flow and at nodal distances from the M 7.7 south of Cuba of January 28, 2020 continued to display enhanced seismicity today. These include areas of New Guinea (144 degrees, node 5); Volcano Islands (120 degrees, node 3); Iceland (60 degrees, node 6), Mammoth Lakes, California (40 degrees node 9), Nevada (36 degrees node 10), southern Alaska and Hawaii (72 degrees, node 5). Enhanced motions of the earth's surface at these distances (360/n, where n is a small integer) may be bringing on this seismicity.

 

An M 4.2 in Hawaii today continued the enhancement of seismicity in the area which began after the M 7.7 south of Cuba of January 28, 2020. NEIC reported today's event was felt throughout Hawaii with intensity II-III in Hawaii National Park, Volcano, Pahoa, Mountain View, Kurtistown, Pahala, Keaau, Hilo, Papaikou and Pepeekeo, Hawaii. This follows an M 3.8 on January 29, 2020.  The last such event of M>=4.2 in the region occurred on November 11, 2019 with M 4.9. When the M 3.8 occurred on January 29, this summary noted:

 

"An M 3.8 in the Leilani Estates region of Hawaii today was widely felt. NEIC reported IV at Pahoa and II-III at Mountain View, Kurtistown, Volcano, Keaau, Hawaii National Park,  Hilo, Papaikou, Pepeeleo and Hakalau, Hawaii. This is the area where a strong eruption occurred in the summer of 2018 which stopped short on August 9, 2018. The only earthquake in the area of stronger magnitude since then was an M 5.5 on March 13, 2019 about 25 km west of today's epicenter. Forecast 121467 had expected today's event was likely within about 25 km of this epicenter around January 27. This epicenter is located at the fifth node (72 degrees) from the M 7.7 in Cuba of January 28 and was probably promoted from that source. If this is the case further seismicity and perhaps volcanism may follow in Hawaii.' (January 30, 2020)

 

O:  3FEB2020 06:37:10  19.3N  155.2W Ml=4.2  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JAN2020 121467    19.3N  155.3W 4.0-5.3 CAAAA  Hawaii area                

 

An M 4.4 also occurred near Redoubt Volcano, Alaska today. NEIC reported intensity II-III in Kasilof, Clam Gulch, Soldotna, Sterling, Kenai, Homer, and Anchorage, Alaska. The last earthquake within about 100 km of this epicenter was an M 4.8 on March 7, 2019 and February 1, 2019. Forecast 121590 had expected today's event at the end of January.

 

O:  2FEB2020 14:57:52  58.2N  156.0W mb=4.4  EMSC   ALASKA PENINSULA             

P: 24JAN2020 121590    60.0N  153.5W 3.2-4.9 CBBAA  Central Alaska             

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 south of Anchorage, Alaska. This is the strongest earthquake within about 100 km of this epicenter since the activation of early July, 2019 when quakes of M 4.6 and 4.7 occurred. Forecast 121591 had expected this activity was possibly around February 1.

 

O:  3FEB2020 04:49:07  60.6N  152.4W mb=4.6  EMSC   SOUTHERN ALASKA              

P: 24JAN2020 121590    60.0N  153.5W 3.2-4.9 CAAAA  Central Alaska             

P:  1FEB2020 121591    60.1N  150.6W 3.2-4.9 AAAAA  Central Alaska             

 

O:  2FEB2020 09:00:00  63.9N   22.4W ML=3.3  EMSC   ICELAND REGION               

 

An unusual earthquake of M 4.0 also shook the region of Southern Quebec, Canada today. This is the strongest earthquake within about 100 km of this epicenter since an M 4.1 October 1, 2007 and an M 4.5 on October 12, 2003. Forecast 121563 had expected a possible event southwest of this epicenter in late January.

 

O:  2FEB2020 20:05:32  47.5N   78.6W ML=4.0  EMSC   SOUTHERN QUEBEC, CANADA      

P: 25JAN2020 121563    46.0N   81.0W 2.0-3.8 CBBAA  Ohio/Lake Erie              

 

A pair of earthquakes of M 3.6 and M 3.7 in Nevada today were the strongest in California or Nevada.  NEIC reported these earthquakes of M 3.6 and 3.7 in Nevada  was felt with intensity II-III in the area(s) of Nevada at Pioche and Overton. The M 3.7 was felt with intensity VI in Caliente, Nevada and III in Pioche and Baker, Nevada.  These events area at the 10th node (36 degrees) from Cuba and are in the basin and range province of Nevada where heat flow is high. They were probably promoted by energy from the M 7.7 in Cuba of January 28.

Forecast 121499 had expected today's events about 50 km southwest of this epicenter was likely in early February.

 

O: 02FEB2020 19:50:54  37.8N  114.3W ML=2.6  EMSC   NEVADA

O: 02FEB2020 17:39:09  37.8N  114.3W ML=3.6  EMSC   NEVADA

O:  2FEB2020 17:34:29  37.8N  114.3W ML=3.7  EMSC   NEVADA                       

P:  1FEB2020 121499    37.3N  114.9W 2.5-4.3 AAAAA  Nevada area                

 

Seismicity also continued at enhances levels north of Puerto Rico and in southern Puerto Rico. The northern zone is now showing more seismicity than the southern zone and is not part of the aftershock sequence of the January 7, 2020 event of M 6.5. It is on the western boundary of the Puerto Rico Trench. A strong earthquake is overdue and potentially dangerous in the Puerto Rico Trench and may have been promoted by stress transfer from the M 6.5. Forecasts 121459 and 121458 had expected this activity in late January or early February.

 

O: 02FEB2020 09:15:51  19.0N   67.5W ML=3.4  EMSC   PUERTO RICO REGION

O: 02FEB2020 19:37:43  19.3N   66.0W ML=3.5  EMSC   PUERTO RICO REGION

O:  2FEB2020 22:29:41  18.7N   69.8W ML=3.4  EMSC   DOMINICAN REPUBLIC           

P: 31JAN2020 121459    19.0N   71.0W 3.4-4.8 AAAAA  Puerto Rico                

 

O: 03FEB2020 00:33:18  17.9N   66.7W ML=4.2  EMSC   PUERTO RICO REGION

O: 03FEB2020 05:02:12  17.9N   66.8W ML=4.0  EMSC   PUERTO RICO REGION

P: 29JAN2020 121458    18.0N   66.0W 3.4-4.9 BAAAA  Puerto Rico                 

 

TODAY IN EARTHQUAKE HISTORY

 

GLOBAL:

 

The following events of Mw>=7 have occurred on this date in recorded history:

 

MO DA HR MN SC YEAR  LATIT   LONGIT  DEP MW  LOCATION

 

 2  2 15  0  0 1605  33.050  138.050   0 7.9   Central/So. Honshu Japan

 

Also given date as Jan. 31. 700 houses - 41% of the town of Hiro was destroyed. A strong tsunami was generated which washed away Hito and drowned 3600 in Shishikui, Awa with maximum height 7 meters.  50 were drowned at Sakihama and 350 more at Kannoura. More than 5,000 drowned in the area. To the east in the  Emjimada area castles at Tawara in Atsumi and Kakegawa were destroyed. 80% of the houses at Ari were washed away in the tsunami which hit the coast from Ise Shima to Boso. More than 1,000 people were drowned in this area.

 

 2  2 10 30  0 1879 -53.000  -70.670   0 7.3   So. So. America

 2  2 11 22 18 1920  -4.000  152.500  60 7.7   New Britain

 2  2  5  7 38 1923  53.500  162.000  60 7.2   E. of Kamchatka

 

Followed by a great earthquake in the area on Feb. 4. Tha earthquake triggered a strong tsunami which washed houses away at Kolgir Bay and Semljachik. Two were killed in flooding at Ostrovna. At Hawaii the sea recession stranded a ship on the harbor floor and caused up to $1.5 million damage while killing one. Felt with reported intensity X. Hunters noted snowslides, land creeps and fissures. Nomads tents were destroyed at Kronot Bay and it was impossible to stand. Chimneys were destroyed at Ust-Kamchatka and in the Kolygir and Ostravnaya Bays.  Felt strongly at Petropavlovsk, Kozyrevsk anf Klyuchi. Also felt at Tilgil.  The tsunami began as a recession and the sea bottom of Kolygir Bay was lain bare for 2 km.

 

 2  2  0  0 19 1929  -1.500  -21.000  60 7.1   Central Mid-Atlantic

 2  2 22 46 42 1931 -39.500  177.000  60 7.9   North Island, N.Z.

 

Also known as the Hawke Bay earthquake. This event caused great damage at Napier, Hastings and neighboring towns and was center close to the city of Napier. Uplift of 6-9 feet was observed along the coast in the Hawkes Bay region. At Napier buildings, bridges, and railways were damaged and water and electrical services were disrupted. Fires followed and did some damage. The harbor (inner and outer) rose by up to 8 feet and had to be dredged to the original depth afterwards. In some areas the depth changed from 42 to 24 feet. Houses on the beach were left far from shore.  One bluff collapsed into the sea and rivers and streams increased flow by up to 50%. At least 256 were reported killed in Napier, Hastings and Wairoa.  In Feb. 17 uplift occurred in Sponge Bay near Gisborne. Workers observed a boulder bank rise out of the sea without warning reaching a height of 7 feet and covering up to 2 acres. .

 

 

 2  2 17 41 29 1949  53.000 -173.000 220 7.0   Andreanoff Islands, Aleutians

 2  2 23 33 39 1950  21.700  100.100   0 7.0   Myanmar

 2  2  8 43 39 1975  53.113  173.497  10 7.6   Rat Islands

 

Felt with maximum intensity IX at Shemya air base where the runway was cracked and fissured for more than 1000 m. Fissures extended into the tundra with vertical throw of up to 4 cm. Sand fountains were observed. Two hangar doors were damaged at Shemya AFB. A water pipe ruptured. Heavy equipment was moved. Fifteen people were injured. A strong foreshock was recorded.

 

TODAY IN EARTHQUAKE HISTORY

 

 

U.S./CANADA

 

Following are events of Mb>=5 which have occurred in this region on this date.

 

MO DA HR MN SC YEAR  LATIT   LONGIT  DEP MW  LOCATION

 

 

 2  2  0  0  0 1766  42.000  -68.000   0 5.0   Maine

 2  2  0 11  0 1881  36.000 -120.500   0 5.9   Central California

 

Felt strongly at Salinas (intensity III) and Visalia.

 

 

 2  2 12 52  0 1928  47.800 -121.700   0 5.0   Washington state, U.S.

 

Generally felt at Startup, WA with a strong shaking and roaring alarming people. Paper and Plaster cracked.

 

 2  2 17 41 29 1949  53.000 -173.000 220 7.0   Andreanoff Islands, Aleutians

 2  2  0  4 16 1961  37.400 -118.500  23 5.3   California/Nevada area

 2  2  0  7 42 1961  37.417 -118.667   0 5.1   California/Nevada area

 

Felt over an area of 13,500 sq. miles with maximum intensity V. Frightened may at Bigpine, Bishop, Laws and Long Valley in California. In Nevada objects were disturbed and a windmill swayed at Dyer.

 

 2  2  6 43 29 1962  36.500  -89.600  25 5.5   New Madrid area

 

Awakened and frightened many in the large area of Arkansas, Kentucky, Missouri, Tennessee and Illinois. Water pipes broke and walls and plaster were cracked at Catron. Chimneys were damaged at Marston. Damage with intensity V occurred in Arkansas and Union City, TN.

 

 2  2  0 48 56 1971  51.717 -173.204  49 5.2   Andreanoff Islands, Aleutians

 2  2 15 55 28 1974  61.602 -147.603  48 5.1   Central Alaska

 

Felt in Southern Alaska with intensity II. Felt strongly in Anchorage, Palmer and other communities.

 

 2  2  8 43  0 1975  53.100  173.400  10 7.6   Rat Islands, Aleutians

 

Felt with maximum intensity IX at Shemya air base where the runway was cracked and fissured for more than 1000 m. Fissures extended into the tundra with vertical throw of up to 4 cm. Sand fountains were observed. Two hangar doors were damaged at Shemya AFB. A water pipe ruptured. Heavy equipment was moved. Fifteen people were injured. A strong foreshock was recorded.

 

 2  2  9 28 34 1982  25.828 -109.508  10 5.2   Gulf of California

 2 02 00 38 17 2011  54.974 -160.465  35 5.9   Unimak Island, Aleutians

 

ERATE QUAKE SHAKES TOKYO, JAPAN REGION

 

EARTHQUAKE SUMMARY FOR JANUARY 31, 2020

 

A moderate earthquake of M 5.3 was felt in the region of Tokyo, Japan today. NEIC reported maximum intensity V in Japan at Ibaraki, Chiba; and III in Saitama. A foreshock of M 5.1-5.2 was felt with maximum intensity IV in Chiba and II-III in Tokyo, Kanagawa, and Saitama, Japan. The last event of M>=5.3 within about 100 km of Tokyo was an M 5.3 on May 17, 2018. An M 5.6 occurred about 100 km east of today's event on January 2, 2020. Forecast 121506 had expected today's event within about 50 km of these epicenters was likely around January 31.

 

O: 31JAN2020 16:11:24  35.7N  140.6E mb=5.1  EMSC   NEAR EAST COAST OF HONSHU, JAP

O: 31JAN2020 17:07:47  35.9N  140.1E Mw=5.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 31JAN2020 121506    36.0N  141.0E 4.0-5.3 AAAAA  Off East Coast Honshu      

 

The strongest earthquake in the world today was an M 5.7 south of the Fiji Islands. This is the strongest earthquake within about 150 km of this epicenter since an M 6.5 also (like today's hypocenter) at 576 km depth on September 16, 2018. Forecast 121628 had expected today's event within about 50 km at the end of  January. This earthquake is located at 144 degrees from the M 6.8 in Turkey of  January 24 and may have been promoted by concentrated energy from this source.

 

O: 31JAN2020 13:53:31  25.4S  178.5E Mw=5.7  EMSC   SOUTH OF FIJI ISLANDS        

P: 26JAN2020 121628    25.0S  179.0E 4.0-5.4 BAAAA  Tonga/Fiji                 

 

The strongest earthquake in the U.S. or Canada today was an M 5.1 in the Gulf of Alaska. NEIC noted it might have been felt with intensity II in Kodiak, Alaska.

This is the strongest aftershock in the Gulf of Alaska of the M 7.9 on January 23, 2018 since an M 5.5 on May 8, 2018. Only one other event of M>=5.1 has occurred within about 150 km of this epicenter in the past 30 years - an M 5.2 on April 7, 2018. Forecast 121598 had expected today's event within about 100 km of the epicenter was likely at the end of January. Like earthquakes in Iceland today, these epicenters are near the sixth node (60 degrees) from the event south of Cuba of January 28 and may have been promoted by energy from that source.

 

O: 31JAN2020 11:25:37  55.9N  149.4W Mw=5.1  EMSC   GULF OF ALASKA               

P: 25JAN2020 121598    54.9N  149.8W 3.0-4.5 CAAAA  Gulf of  Alaska            

 

A series of earthquakes in Iceland today included an M 4.0 and 3.9. These earthquakes are located near the sixth node (60 degrees) from the event of M 7.7 near Cuba and may indicate incipient volcanism promoted by seismic energy from the Caribbean.

 

O: 31JAN2020 22:54:06  63.9N   22.4W ML=3.3  EMSC   ICELAND REGION

O: 31JAN2020 21:45:46  63.9N   22.4W ML=3.4  EMSC   ICELAND REGION

O: 31JAN2020 22:24:55  63.9N   22.4W ML=3.9  EMSC   ICELAND REGION

O: 31JAN2020 22:22:21  63.9N   22.4W ML=4.0  EMSC   ICELAND REGION

O:  1FEB2020 00:07:22  63.9N   22.4W ML=3.0  EMSC   ICELAND REGION               

 

Moderate earthquakes also resumed today in Eastern Turkey. The largest these - an M 4.6 - was felt lightly in the region of Elazig. Forecast 121531 had expected this activity within about 50 km was likely around February 1. This activity is at 101-103 degrees from Cuba and may have been promoted by the M 7.7 there two days ago.

 

O: 31JAN2020 15:36:12  38.4N   39.2E ML=3.9  EMSC   EASTERN TURKEY               

O: 01FEB2020 00:03:48  38.4N   39.2E ML=4.3  EMSC   EASTERN TURKEY

O: 31JAN2020 23:32:50  38.5N   39.3E mb=4.6  EMSC   EASTERN TURKEY               

P:  1FEB2020 121531    38.0N   39.0E 3.5-4.8 AAAAA  Turkey                     

 

EASTERN EUROPE CONTINUES AT ACTIVE STATE

 

EARTHQUAKE SUMMARY FOR JANUARY 30, 2020

 

Earthquake activity continued from Greece and Turkey northward to Romania today.

This is likely related to the M 7.7 in Cuba of January 28 as it is, for the most part, at or near the fourth node (90 degrees) or near 100-103 degrees from that epicenter. An earthquake of M 4.8 shook a wide band of Romania today. NEIC reported this event was felt with maximum intensity IV in Romania a Homocea Vrancea, Letea Veche, Bacau, and Sendreni, Galati and II-III in Romania at Buzau, Sacele, Brasov, Hemeius, Ploiesti and Smardan. The last earthquake of M>=4.8 in Romania occurred on October 28, 2018 (M 5.5) and prior to that on December 27, 2016 (M 5.6). Forecast 121556 had expected activity in Romania was likely at the end of January.

 

O: 31JAN2020 01:26:47  45.7N   26.7E mb=4.8  EMSC   ROMANIA                      

P: 25JAN2020 121566    43.0N   22.0E 3.0-5.1 CCCAA  Romania/NW Turkey          

 

The strongest earthquake in the world today was an M 5.8 south of Romania in the currently active zone of the Dodecanese Islands, Greece. NEIC reported it was felt in Greece with intensity II-III in Rodos, Dodecanese Islands and in Rentina, Karditsa. This continues a series of moderate to moderately large earthquakes in the Dodecanese Islands a 90 degrees from the Cuba epicenter in the past several days. Forecast 121479 had expected today's activity was likely within about 200 km of this epicenter around January 28.

 

O: 30JAN2020 11:21:36  35.1N   27.8E Mw=5.7  EMSC   DODECANESE ISLANDS, GREECE   

O: 31JAN2020 04:34:38  35.1N   28.0E mb=4.7  EMSC   DODECANESE ISLANDS, GREECE   

P: 28JAN2020 121479    36.0N   26.0E 3.0-4.5 BAAAA  Aegean Sea                 

 

A strong earthquake of M 5.9 also shook the region near the north coast of New Guinea today. The last events within about 200 km of this epicenter with M>=5.9 occurred on January 27, 2019 and January 26, 2018 (M 6.2-6.3) and June 2, 2017 (M 5.9).  Forecast 121424 had expected this activity about 150 km to the south around January 26. This epicenter is located at 105 degrees from the M 6.8 in Turkey of January 24 and was probably promoted by energy from that event.

 

O: 31JAN2020 02:19:09   3.3S  146.0E mb=4.9  EMSC   NEAR N COAST OF NEW GUINEA, PN

O: 31JAN2020 03:15:22   3.3S  146.2E mb=4.4  EMSC   BISMARCK SEA                 

O: 30JAN2020 22:38:55   3.4S  146.2E Mw=5.9  EMSC   BISMARCK SEA                 

P: 26JAN2020 121424     5.0S  146.0E 4.0-5.3 BBAAA  New Ireland                

 

The western Andreanof Islands of the Aleutians, Alaska continued today. The strongest earthquake in the U.S. or Canada was an M 4.6 in this region. It was not reported felt in this remote area. It appears to be an outer rise events. Such earthquakes occur on the outer rise of subduction zones and have been linked to later major earthquakes downslope in the subduction zone. Today's event occurred south of the M 6.2 of January 23. It is the largest event in the outer rise within about 100 km of this epicenter since an M 5.4 on September 9, 2019 and prior to that an M 4.8 on August 10, 2018. It is the first south of 50 North latitude in the area since an M 4.9 on August 18, 2013. The only other such event in this area in the past 30 years was an M 4.8 on July 27, 1994. Forecast 121575 had expected today's event within about 100 km was likely around January 31.

 

O: 30JAN2020 18:34:00  49.9N  177.8W mb=4.6  EMSC   SOUTH OF ALEUTIAN ISLANDS    

P: 31JAN2020 121575    51.0N  177.1W 3.5-4.8 ABAAA  Andreanoff Isls, Aleutians 

 

FAR-FIELD SEISMICITY UP AFTER M 7.7 NEAR JAMAICA

 

EARTHQUAKE SUMMARY FOR JANUARY 29, 2020

 

A series of moderately strong to strong earthquake occurred at nodal distances from the M 7.7 in Cuba. Local, but unusual quakes were also recorded in northern Puerto Rico. The largest far-field events included an M 5.6 in the Dodecanese Islands, a series of events in Iran-Iraq, an M 3.8 in eastern Hawaii, an M 5.7 in Molucca and an M 6.0 in the Solomon Islands. The strongest earthquake in the world today was an M 6.0 in the Solomon Islands. NEIC reported it was felt with intensity III in Honiara, Guadalcanal and Auki Malaita, Solomon Islands. This is the second strong earthquake to hit near this epicenter in the past several days. An M 6.3 also was recorded about 50 km northwest of today's epicenter on January 27. At the time this summary noted:

 

 

"The strongest earthquake of the day occurred as an M 6.3 in the Solomon Islands in the south Pacific. It was reported felt with intensity VI in Kirakira Makira and Ulawa, Solomon Islands and IV in Honiara, Guadalcana dn Buala Isabel, Solomon Islands. This is the largest earthquake within about 200 km of this epicenter since an M 6.5 on September 9, 2018 and prior to that an M 6.5 on January 19, 2017. Forecast 121363 had expected this event within about 100 km was likely at the end of January." (January 27, 2020)

 

Today's epicenter is at the third node (120 degrees) from the event near Jamaica of January 28 and may have been promoted by energy from that source.

 

O: 29JAN2020 13:49:50  10.3S  161.3E Mw=6.0  EMSC   SOLOMON ISLANDS              

P: 20JAN2020 121363    10.0S  162.0E 4.0-5.3 CAAAA  No. of Santa Cruz Islands  

 

A moderately strong M 5.7 earthquake also shook the Molucca Sea, Indonesia today. Molucca had been expected to see enhanced seismicity at this time due to its distance (144-149 degrees) from the M 7.7 in Cuba of January 28. In the previous issue of this summary it had been noted in this regard:

 

"The earthquake near Cuba may reset global seismicity as it is the strongest in nearly a year in the world. Far-field triggering is most likely in eastern Turkey, Iran/Iraq and the east African Rift valley as well as in Hokkaido and northern Japan (103 degrees); in Molucca, southeast Asia, Central Philippines, New Guinea (144 degrees); Southern California (51 degrees); Greece and western Turkey (90 degrees); Andreanof Islands (72 degrees); among others." (January 29, 2020)

 

Prior the event in Cuba, the last major (M>=7) earthquake in the world occurred with M 7.1 on November 14, 2019 and today's event is probably an aftershock of that. Forecast 121411 had expected today's activity was likely in late January.

 

O: 29JAN2020 23:46:56   0.7N  126.3E Mw=5.7  EMSC   MOLUCCA SEA                  

O: 30JAN2020 01:02:46   1.5N  126.5E mb=4.6  EMSC   MOLUCCA SEA                  

P: 31JAN2020 121411     2.0N  126.0E 4.0-5.3 AAAAA  Mindanao, Philippines      

 

A series of moderate earthquakes hit the Dodecanese Islands of Greece today. The strongest of these was an M 5.2-5.6. This continues a series of earthquake in the area which began with an M 5.4 on January 28, 2020. The last earthquakes in the area of M>=5.6 occurred on August 8, 2019 and March 20, 2019 with M 5.7-5.8

Forecast 121479 had expected today's activity was likely about 150 km to the west around January 28. This activity may have been promoted from the M 7.7 in Cuba of January 28. It is located at the fourth node from that epicenter (90 degrees).                                         

 

O: 30JAN2020 05:43:58  35.0N   27.8E ML=4.3  EMSC   EASTERN MEDITERRANEAN SEA

O: 29JAN2020 13:37:00  35.0N   27.8E mb=4.7  EMSC   DODECANESE ISLANDS, GREECE

O: 30JAN2020 05:12:04  35.1N   27.9E mb=4.5  EMSC   DODECANESE ISLANDS, GREECE

O: 30JAN2020 01:28:09  35.1N   27.9E mb=5.2  EMSC   DODECANESE ISLANDS, GREECE

O: 30JAN2020 01:28:06  35.2N   27.9E mb=5.6  ANSS   DODECANESE ISLANDS, GREECE

O: 30JAN2020 02:10:55  35.3N   27.6E mb=4.4  EMSC   DODECANESE ISLANDS, GREECE   

O: 30JAN2020 01:46:32  35.7N   28.2E mb=4.2  EMSC   EASTERN MEDITERRANEAN SEA    

P: 28JAN2020 121479    36.0N   26.0E 3.0-4.5 AABAA  Aegean Sea                 

 

An M 3.8 in the Leilani Estates region of Hawaii today was widely felt. NEIC reported IV at Pahoa and II-III at Mountain View, Kurtistown, Volcano, Keaau, Hawaii National Park,  Hilo, Papaikou, Pepeeleo and Hakalau, Hawaii. This is the area where a strong eruption occurred in the summer of 2018 which stopped short on August 9, 2018. The only earthquake in the area of stronger magnitude since then was an M 5.5 on March 13, 2019 about 25 km west of today's epicenter. Forecast 121467 had expected today's event was likely within about 25 km of this epicenter around January 27. This epicenter is located at the fifth node (72 degrees) from the M 7.7 in Cuba of January 28 and was probably promoted from that source. If this is the case further seismicity and perhaps volcanism may follow in Hawaii.

 

O: 29JAN2020 22:23:26  19.3N  155.0W Ml=3.8  EMSC   HAWAII REGION, HAWAII        

P: 27JAN2020 121467    19.3N  155.3W 4.0-5.3 AAAAA  Hawaii area                

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the active region of the western Andreanof Islands where several events of M>=6 have occurred in late January. Today's earthquake was not reported felt in this remote area. Forecast 121575 had expected this activity was likely at the end of January. This epicenter at the fourth  node  (90 degrees)from Cuba and may have been affected by energy from that major earthquake.

 

O: 30JAN2020 06:10:19  51.1N  179.9W mb=4.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24JAN2020 121575    51.0N  179.1W 3.5-4.8 CAAAA  Andreanoff Isls, Aleutians 

P: 31JAN2020 121575    51.0N  177.1W 3.5-4.8 AABAA  Andreanoff Isls, Aleutians 

 

Aftershocks continued in the area of Cuba today. The strongest of these was an M 5.1 north of Jamaica. NEIC reported it was felt with maximum intensity IV in George Town, Grand Cayman Islands and II in West Bay and Playa del Carmen, Grand Cayman Islands and II-III in Jamaica at Montego Bay, Alligator Pond, Half Way Tree and Kingston. This is the first major aftershock near the epicenter of the January 28 M 7.7 Forecast 121439 had expected this activity at the end of January.

 

O: 29JAN2020 15:01:40  19.0N   80.7W mb=4.0  EMSC   CAYMAN ISLANDS REGION        

O: 29JAN2020 14:14:43  19.2N   79.8W mb=4.1  EMSC   CAYMAN ISLANDS REGION        

O: 29JAN2020 14:53:14  19.4N   78.6W mb=5.1  EMSC   CUBA REGION                  

P: 31JAN2020 121439    19.0N   81.0W 3.5-5.0 AABAA  Caribbean Sea               

 

An earthquake midway between Northern Puerto Rico and the Dominican Republic of M 4.5 also occurred today. NEIC reported intensity II-III for this event in Puerto Rico at Aguadilla, Penuelas, Bayamon, and in the Dominican Republic at Otra Banda, El Carni, Moca Espaillat, and El Llano and in Toad Town, British Virgin Islands This is an unusual epicenter. The last event within about 50 km of this epicenter occurred as an M 6.0  on September 27, 2019, the first in the current active period in Puerto Rico. Forecast 121458 had expected today's event to the southeast around January 29. This is getting close to the Puerto Rico Trench where a major subduction type earthquake is possible. When the M 6.0 occurred on September 24, 2019 this summary noted:

 

"NEIC reported the mainshock was felt with maximum intensity V in Puerto Rico at San Antoniom Quebradillas, IV in Aguadilla, Isabela, Aguada, Rincon, Camuy, and Anasco and within about 200 km of the epicenter in the Puerto Rico trench. A series of moderate aftershocks including an M 5.0 and 4.4 were felt in a similar area. An aftershock of M 4.3 was felt in Puerto Rico with maximum intensity V in Camuy and Hatillo; IV in Isabela, Quebradillas, Aguada, Rincon and Mayaguez and II-III in Aguadilla, Moca and San Sebastian among others. The aftershocks suggest that the activity is not over and that the M 6.0 may not have used up the available seismic energy in the trench. It has been nearly 75 years since a strong tsunami hit in this area but such an event remains a possibility. Built structures could be vulnerable to a strong tsunami such as that in 1946. Thanks in large part to international and governmental efforts, the potential for a large tsunami in the area has been recognized and preparations for such

an event have been made." (September 24, 2019)

 

 

O: 29JAN2020 14:22:45  19.0N   67.6W ML=3.6  EMSC   PUERTO RICO REGION

O: 29JAN2020 14:27:34  19.0N   67.6W mb=4.5  EMSC   PUERTO RICO REGION

O: 29JAN2020 14:53:39  19.2N   67.7W ML=3.1  EMSC   PUERTO RICO REGION

O: 30JAN2020 06:33:19  19.0N   67.5W ML=3.3  EMSC   PUERTO RICO REGION           

P: 29JAN2020 121458    18.0N   66.0W 3.4-4.9 AAAAA  Puerto Rico                

 

MAJOR QUAKE HITS SOUTH OF CUBA

 

EARTHQUAKE SUMMARY FOR JANUARY 28, 2020

 

An M 7.7 south of Cuba today was widely felt throughout the Caribbean and southeastern U.S. But if was far enough from land that there were no major damages or casualties reported with this event. An M 6.0 aftershock in the Cayman Islands followed. Tsunamis are common with earthquake of this magnitude but it was probably strike-slip motion which does not lift the surface greatly and, while the Pacific Tsunami Warning Center warned of a possible tsunami of 1-3 feet, but such a tsunami was not observed. This is the strongest earthquake in the world since an M 8.0 in Northern Peru-Brazil on May 26, 2019 and two of M 8.2 and 7.9 in the Tonga-Fiji area in August and September, 2018. This is the strongest event within about 500 km of this epicenter since an M 7.9 in 1900 and an M 7.8 on June 14, 1899. Lesser earthquakes within the area of about 500 km from this epicenter have most recently occurred on February 4, 2007 (M 6.2); and on May 25, 1992 (M 6.8). Three events about 200 km to the west occurred on June 27, 1995 (M 6.0); September 9, 2004 (M 6.0) and December 14, 2004 (M 6.8). The strongest historical events in the area occurred on June 21, 1900 (M 7.9); June 14, 1899 (M 7.8) and in 1692 (M 7.7-7.8). Today's earthquake is a 100 degrees from the M 6.8 in Eastern Turkey of January 24. It is likely to have been promoted by seismic energy from that source. Forecast 121439 had expected today's activity within about 50 km of the  Cayman Islands was likely around January 31.

 

The M 7.7 was felt with maximum intensity V in Lucea and IV in Grange Hill, Negril, Montego Bay, Anchovy, Petersfield and Bethel Town, Jamaica and II-III in Jamaica at Sandy Bay, Little London and Hopewell. It was also felt in Cuba and in eastern North America as far north as Ontario, Canada more than 2000 km away from the epicenter. States reporting intensity II-III included Jalisco, Mexico and in the U.S. in New York, Michigan, Oklahoma, Pennsylvania,  Ohio, Indiana, Maryland, Arkansas, Washington DC, Louisiana, Texas, Kentucky, Tennessee, Alabama, South and North Carolina, Georgia, Florida.    Also reported felt in Anguilla, Venezuela, the Virgin Islands, Guatemala, Mexico, Puerto Rico, Belize, the Dominican Republic, Caicos Islands, Haiti, Bahamas, Saint Kitts and Nevis, Ecuador among others.  The M 6.1 in the Grand Cayman Islands, an aftershock of the M 7.7 was felt with maximum intensity VI in Santiago de Cuba; IV in Bodden Town, George Town and West Bay, Grand Cayman and II-III in East End, Cayman Islands and Varadero, Cuba. Giant Sinkholes opened up in the Cayman Islands. The epicenter of the earthquake in Cuba is antipodal to Tropical Cyclone Claudia which passed north of Australia two weeks ago. This summary had noted its possible effect on Caribbean seismicity at the time as:

 

"TC Claudia continued today in the region north of Western Australia with winds up to 50 kts. It is expected to track to the west over the next several days. It will be antipodal to the Haiti and the Dominican Republic today and may help continue aftershocks in that area for the next several days." (January 15-16, 2020)

 

The earthquake near Cuba may reset global seismicity as it is the strongest in nearly a year in the world. Far-field triggering is most likely in eastern Turkey, Iran/Iraq and the east African Rift valley as well as in Hokkaido and northern Japan (103 degrees); in Molucca, southeast Asia, Central Philippines, New Guinea (144 degrees); Southern California (51 degrees); Greece and western Turkey (90 degrees); Andreanof Islands (72 degrees); among others.

 

O: 29JAN2020 04:37:29  18.9N   80.8W mb=4.1  EMSC   CAYMAN ISLANDS REGION

O: 29JAN2020 01:18:08  18.9N   80.8W mb=4.3  EMSC   CAYMAN ISLANDS REGION

O: 29JAN2020 05:16:44  18.9N   80.8W mb=4.3  EMSC   CAYMAN ISLANDS REGION

O: 29JAN2020 00:41:56  18.9N   80.8W mb=4.4  EMSC   CAYMAN ISLANDS REGION

O: 29JAN2020 02:13:15  19.0N   80.8W mb=4.4  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 19:32:56  18.9N   80.6W ML=4.5  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 20:29:02  19.0N   80.2W mb=4.1  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 22:16:09  19.0N   80.7W mb=4.4  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 22:58:21  19.0N   80.8W mb=4.4  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 21:55:17  19.0N   80.9W Mw=6.1  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 23:04:23  19.0N   80.9W mb=4.4  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 21:00:00  19.0N   80.9W mb=4.9  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 22:45:01  19.1N   80.1W mb=4.4  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 20:39:45  19.3N   79.2W mb=4.7  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 19:10:26  19.4N   79.0W Mw=7.7  EMSC   CUBA REGION                  

P: 31JAN2020 121439    19.0N   81.0W 3.5-5.0 BAAAA  Caribbean Sea              

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the currently active area of western Andreanof Islands. This area has seen several events of M>=6 in the past 8 days. Today's event was not reported felt in this remote region. Forecast 121575 had expected today's actvity around January 24.

 

O: 28JAN2020 16:41:43  51.2N  179.9W mb=4.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24JAN2020 121575    51.0N  179.1W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

MODERATE EARTHQUAKE SHAKES HOKKAIDO, JAPAN

 

EARTHQUAKE SUMMARY FOR JANUARY 27, 2020

 

The strongest earthquake in the world today was an M 5.5 in the Kuril Islands east of Hokkaido, Japan. NEIC reported this earthquake of M 5.5 in Hokkaido, Japan  was felt with intensity II-III in the area(s) of Hokkaido, Japan at Misawa and Aomori. This is the largest earthquake within about 200 km of this epicenter in the Kurils since an M 5.9 more than a year ago on November 4, 2018.

Forecast 121543 had expected today's event within about 100 km was likely around January 26.

 

O: 28JAN2020 01:36:03  43.5N  146.0E mb=5.5  EMSC   KURIL ISLANDS                

P: 26JAN2020 121543    43.0N  147.0E 3.5-5.3 AAAAA  Hokkaido, Japan            

 

The strongest earthquake in the U.S. or Canada today was an M 5.2 in the western Andreanof Islands, Aleutians. This is part of a series of moderate to strong earthquakes which has afflicted the region in the past 10 days. As it stands alone today, it is likely to be near the end of this sequence. Forecast 121575 had expected this event was likely around January 24.

 

O: 27JAN2020 15:51:50  51.2N  179.8W mb=5.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24JAN2020 121575    51.0N  179.1W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

Other aftershock zones also showed moderate seismicity today. In Eastern Turkey, an M 4.4 was lightly felt but did not do any major damage. In Puerto Rico the largest event of the day was an M 4.4 which was also reported felt in Ponce without

 additional damage. The earthquake in Turkey had been expected within about 50 km of that epicenter in late January or early February in forecast 121531. The event in Puerto Rico had likewise been expected within about 50 km to occur around January 29 (forecast 121458).

 

O: 27JAN2020 16:12:00  38.4N   39.1E mb=4.4  EMSC   EASTERN TURKEY               

P:  1FEB2020 121531    38.0N   39.0E 3.5-4.8 BAAAA  Turkey                     

 

O: 27JAN2020 06:53:23  17.9N   66.6W mb=4.4  EMSC   PUERTO RICO REGION           

P: 29JAN2020 121458    18.0N   66.0W 3.4-4.9 AAAAA  Puerto Rico                

 

STRONG QUAKE IN SOLOMON ISLANDS

 

EARTHQUAKE SUMMARY FOR JANUARY 26, 2020

 

The strongest earthquake of the day occurred as an M 6.3 in the Solomon Islands in the south Pacific. It was reported felt with intensity VI in Kirakira Makira and Ulawa, Solomon Islands and IV in Honiara, Guadalcanal and Buala Isabel, Solomon Islands. This is the largest earthquake within about 200 km of this epicenter since an M 6.5 on September 9, 2018 and prior to that an M 6.5 on January 19, 2017. Forecast 121363 had expected this event within about 100 km was likely at the end of January.

 

O: 27JAN2020 05:02:04  10.1S  161.0E Mw=6.3  EMSC   SOLOMON ISLANDS              

P: 20JAN2020 121363    10.0S  162.0E 4.0-5.3 CAAAA  No. of Santa Cruz Islands  

 

As it has for several days, the strongest seismicity in the U.S. or Canada today occurred in the Aleutian Islands of Alaska. This seismicity appears to be migrating to the west and included several moderate earthquake in the Rat Islands west of the Andreanof Islands today. These including event of M 4.4, 4.4,  4.2 and 4.6 among others. The strongest earthquakes in the Andreanof Islands were of M 5.2, 5.6 and 5.8. In the previous issue of this summary this had been noted as:

 

" the M 6.0 occurred on January 23, 2020. The last earthquake within about 100

km of the mainshock with M>=6 occurred about 100 km to the east on December 2, 2019. The last in the Andreanof Islands closer than 100 km to today's activity was an M 6.6 on April 16, 2008. Forecast 121575 had expected today's activity in this area was likely around January 24. This activity may have been enhanced by the new moon which arrived yesterday." (January 25-26, 2020)

 

O: 26JAN2020 07:08:12  50.9N  179.9W mb=4.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 07:39:32  50.9N  180.0E mb=4.4  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 26JAN2020 23:49:34  51.0N  179.9E mb=4.4  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 26JAN2020 07:51:49  51.0N  180.0W mb=4.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 10:29:17  51.1N  179.8W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 08:41:16  51.1N  179.9W mb=4.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 09:12:05  51.2N  179.7W Mw=5.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 07:24:06  51.2N  179.9W Mw=5.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 08:11:57  51.2N  179.9W mb=4.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 22:40:26  51.2N  180.0W mb=4.6  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 26JAN2020 09:10:04  50.8N  179.8E mb=4.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 26JAN2020 22:33:39  51.3N  179.9W Mw=5.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24JAN2020 121575    51.0N  179.1W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

P: 28JAN2020 121583    51.0N  178.0E 4.0-5.5 AAAAA  Rat Islands                

 

Moderate sized earthquakes continued in Puerto Rico today. NEIC reported these were felt with intensity IV-VII in Ponce, and II-III in Santa Isabel, San German, Corozal, Isabela, Rincon, Puerto Rico and in Road Town, Virgin Islands.

Following are events in Puerto Rico today of M>=4. A listing of events of M>=3 is located in the "AMERICA" section below. Forecast 121458 had expected this activity was likely around January 29.

 

O: 26JAN2020 17:19:05  17.8N   66.8W ML=4.3  EMSC   PUERTO RICO REGION

O: 27JAN2020 05:57:47  17.8N   66.8W mb=4.3  EMSC   PUERTO RICO REGION

O: 27JAN2020 05:20:39  17.9N   66.6W mb=4.2  EMSC   PUERTO RICO REGION

O: 27JAN2020 06:53:23  17.9N   66.6W mb=4.4  EMSC   PUERTO RICO REGION

P: 29JAN2020 121458    18.0N   66.0W 3.4-4.9 BAAAA  Puerto Rico                

 

One moderate event in Puerto Rico occurred about 150 km north of the aftershock zone with M 4.3. This had been expected around January 26.

 

O: 27JAN2020 03:15:15  19.2N   67.1W mb=4.3  EMSC   PUERTO RICO REGION           

P: 26JAN2020 121463    20.0N   67.0W 3.0-4.4 AAAAA  Bahamas/No. Caribbean      

 

Aftershocks in the Barstow area of Southern California also continued today. An M 2.9 was felt with intensity II-III in Barstow and Newberry Springs, California. The M 2.9 in this area today occurred within about 10 km of forecast epicenter 121520 which had expected this around January 26.

 

O: 27JAN2020 05:25:22  35.0N  116.9W ML=2.9  EMSC   SOUTHERN CALIFORNIA          

P: 26JAN2020 121520    35.1N  117.0W 2.5-4.4 AAAAA  So. California             

 

STRONG QUAKES CONTINUE IN  ANDREANOF ISLANDS, ALASKA

 

EARTHQUAKE SUMMARY FOR JANUARY 25, 2020

 

The strongest earthquakes in the world today were located in western Andreanof Islands, Aleutians, Alaska. The largest of these was an M 6.0 but associated shocks of M 5.6 and 5.3 also occurred. The largest was probably felt in Adak, Alaska. An M 6.2 about 200 km to the east of the M 6.0 occurred on January 23, 2020. The last earthquake within about 100 km of the mainshock with M>=6 occurred about 100 km to the east on December 2, 2019. The last in the Andreanof Islands closer than 100 km to today's activity was an M 6.6 on April 16, 2008. Forecast 121575 had expected today's activity in this area was likely around January 24. This activity may have been enhanced by the new moon which arrived yesterday.

 

O: 26JAN2020 03:57:24  51.3N  179.9W Mw=5.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 06:31:59  51.3N  179.9W Mw=6.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 06:40:53  51.3N  179.9W mb=5.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 25JAN2020 23:28:32  51.3N  179.8W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24JAN2020 121575    51.0N  179.1W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

 

After several days of low seismicity in Puerto Rico, the aftershock sequence restarted today north of the previous epicenters. An M 4.7-5.0 was felt throughout Puerto Rico with maximum intensity VI in Puerto Rico at Utuado; V in Cabo Rojo; IV in Adjuntas, Hatillo and II-III in Lares, Camuy, Moca, Isabela, Manati and Rincon. Other events in the area of M>=4 were two of M 4.2. The M 4.7-5.0 quake is the strongest aftershock in Puerto Rico since an M 5.2 on January 15, 2020. It occurred about 10 km north of the major aftershock sequence and may indicate migration of stresses to the north. Forecasts 121458 had expected this activity was likely around January 24. This activity is located at the fourth node (90 degrees) from the M 6.8 in eastern Turkey of January 24 and may have been promoted by energy from that source.

 

O: 26JAN2020 01:59:26  17.8N   66.8W ML=3.6  EMSC   PUERTO RICO REGION

O: 25JAN2020 14:17:38  17.8N   66.8W ML=4.2  EMSC   PUERTO RICO REGION

O: 25JAN2020 09:08:43  17.8N   68.6W ML=3.4  EMSC   DOMINICAN REPUBLIC REGION

O: 26JAN2020 01:21:13  17.9N   66.8W ML=3.1  EMSC   PUERTO RICO REGION

O: 26JAN2020 02:51:43  17.9N   66.8W ML=3.1  EMSC   PUERTO RICO REGION

O: 25JAN2020 22:22:40  17.9N   66.8W ML=3.2  EMSC   PUERTO RICO REGION

O: 25JAN2020 10:32:20  17.9N   66.9W Md=3.8  EMSC   PUERTO RICO

O: 25JAN2020 08:00:46  17.9N   66.9W Mw=4.2  EMSC   PUERTO RICO REGION

O: 25JAN2020 18:12:11  17.9N   67.0W ML=3.1  EMSC   PUERTO RICO REGION

O: 25JAN2020 09:22:45  18.0N   66.7W Md=3.0  EMSC   PUERTO RICO REGION

O: 25JAN2020 20:20:37  18.0N   66.8W Mw=4.7  EMSC   PUERTO RICO

O: 25JAN2020 20:20:37  18.0N   66.8W Mw=5.0  ANSS   PUERTO RICO

O: 25JAN2020 20:34:15  18.1N   66.8W ML=3.6  EMSC   PUERTO RICO                  

P: 24JAN2020 121458    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

Moderate aftershocks continued today in the region of Eastern Turkey. The largest of these was an M 5.1 felt in the Elazig region of eastern Turkey.

NEIC reported this earthquake of M 5.1 in Eastern Turkey was felt with intensity II-III in the area(s) of Eastern Turkey at Doganyol, Malatya, Turkey and in Urfa. An M 4.4 was reported felt with intensity V in Batman, Turkey.

These are aftershocks of the M 6.8 which hit the area yesterday. Tolls in the earthquake now number at least 31 dead and more than 1607 injured. Buildings continued to collapse. Cold weather down to 10 F hindered rescue efforts today. In the previous issue of this summary it was noted in regard to the mainshock:

 

 

"A strong earthquake M 6.8 hit eastern Turkey today. Initial reports are that the quake killed at least 19 and injured more than 600 near Elazig, eastern Turkey. Strong shaking was felt by about half a million people. Internet pictures showed collapsed buildings and rescue teams in the area. The deaths occurred in Elazig province and in Malatya dn Diyarbakir according to Turkey's Disaster and Emergency Management Presidency (AFAD) which also noted that 10  or more buildings had collapsed. Tolls are expected to rise as at least 30 are missing in Elazig Province. The earthquake was shown live on EDESSA TV.

NEIC reported maximum intensity VIII in Kemalive, Erzincan and VI in Turkey at Elazig, Sincik and Malatya; IV in Yesilyurt, Adryaman, Tunceli, Diyarbakie and IV in Mazgirt, and Dogansehir.  It was also reported felt in Israel, Iran, Azerbaijan, Romania, Russia, Egypt, Jordan, Iraq, Lebanon, Syria and Georgia. It is likely that this earthquake was triggered by strong tidal stresses associated with the new moon today as it occurred at the longitude of maximum stress within several hours of the new moon completion Today's event is the strongest quake in the world since an M 7.1 in Molucca on November 14, 2019 and the second strongest in the past half year. This summary had expected it in the tidal forecast published in previous issues as:

 

"The New Moon will arrive on January 24, 2020 at 21:42 UT. Longitudes which are at local solar midnight at this time are near 40 East while those which are at local solar noon (subsolar) are near 140 West. These include areas of eastern Turkey and eastern Europe in the east and in eastern Alaska south to British Columbia, Canada in the west. While many areas of the world can be activated by tidal stresses these are the areas which see the strongest tidal stresses with this new moon. Global seismicity is expected to be slightly enhanced during the coming week." (January 22-25, 2020)

 

O: 25JAN2020 10:14:57  38.2N   38.8E ML=4.5  EMSC   EASTERN TURKEY

O: 26JAN2020 02:22:45  38.3N   38.8E ML=4.5  EMSC   EASTERN TURKEY

O: 25JAN2020 16:30:07  38.4N   39.0E Mw=5.1  EMSC   EASTERN TURKEY

O: 25JAN2020 16:44:01  38.4N   39.1E ML=4.4  EMSC   EASTERN TURKEY

O: 25JAN2020 08:40:04  38.4N   39.3E ML=4.4  EMSC   EASTERN TURKEY

O: 25JAN2020 16:46:59  38.5N   39.1E ML=4.4  EMSC   EASTERN TURKEY               

P: 16JAN2020 121290    39.0N   40.0E 3.5-4.8 CAAAA  Turkey                     

P:  1FEB2020 121531    38.0N   39.0E 3.5-4.8 CAAAA  Turkey                     

 

NEW MOON TIDES TRIGGER DEADLY QUAKE IN EASTERN TURKEY

 

EARTHQUAKE SUMMARY FOR JANUARY 24, 2020

 

A strong earthquake M 6.8 hit eastern Turkey today. Initial reports are that the quake killed at least 19 and injured more than 600 near Elazig, eastern Turkey. Strong shaking was felt by about half a million people. Internet pictures showed collapsed buildings and rescue teams in the area. The deaths occurred in Elazig province and in Malatya dn Diyarbakir according to Turkey's Disaster and Emergency Management Presidency (AFAD) which also noted that 10  or more buildings had collapsed. Tolls are expected to rise as at least 30 are missing in Elazig Province. The earthquake was shown live on EDESSA TV. NEIC reported maximum intensity VIII in Kemalive, Erzincan and VI in Turkey at Elazig, Sincik and Malatya; IV in Yesilyurt, Adryaman, Tunceli, Diyarbakie and IV in Mazgirt, and Dogansehir. It was also reported felt in Israel, Iran, Azerbaijan, Romania, Russia, Egypt, Jordan, Iraq, Lebanon, Syria and Georgia. It is likely that this earthquake was triggered by strong tidal stresses associated with the new moon today as it occurred at the longitude of maximum stress within several hours of the new moon completion Today's event is the strongest quake in the world since an M 7.1 in Molucca on November 14, 2019 and the second strongest in the past half year. This summary had expected it in the tidal forecast published in previous issues as:

 

"The New Moon will arrive on January 24, 2020 at 21:42 UT. Longitudes which are at local solar midnight at this time are near 40 East while those which are at local solar noon (subsolar) are near 140 West. These include areas of eastern Turkey and eastern Europe in the east and in eastern Alaska south to British Columbia, Canada in the west. While many areas of the world can be activated by tidal stresses these are the areas which see the strongest tidal stresses with this new moon. Global seismicity is expected to be slightly enhanced during the coming week." (January 22-24, 2020)

 

A moderate quake hit west of this on January 22 and was discussed in the context of today's new moon in previous summaries.

 

"A series of moderate to moderately large earthquakes also occurred today in southeastern Alaska, British Columbia and Turkey. These were probably promoted by the new moon tidal stresses as noted in the previous issue of this summary:

 

The strongest of this activity was in western Turkey where an M 5.6 occurred within several hour of local solar midnight and was probably enhanced by tidal stresses associated with the upcoming new moon. Much of the strongest aftershock activity concentrated near local midnight including an M 4.4 and events of M 4.1 and 4.0. NEIC reported this earthquake of M 5.6 in Western Turkey  was felt with intensity II-III in the area(s) of Western Turkey in Soma (IV); IV in Manisa, Balikesir, Salihli, Odemis and Izmir (IV) and II-III in Akhisar, Menemen, Burhaniye and Edremit, Balikesir, Turkey. The M 5.6 is the strongest earthquake within about 200 km of this epicenter since an M 6.3 on June 12, 2017 and prior to that an M 5.9 on May 19, 2011. A similar M 5.6-5.7 event occurred about 200 km northeast of today's epicenter in the area near Istanbul, Turkey on September 26, 2019." (January 22-23, 2020)

 

At M 6.8 today's event is the strongest in Eastern Turkey within about 250 km

of this epicenter in at least 30 years. The last event in the area of M>=6 was an M 6.1 on March 8, 2010 and prior to that an M 5.8 on March 14, 2005.

Forecasts 121531 and  121290  had expected today's activity within about 50 km was likely at the end of January 2020.             

 

 

O: 24JAN2020 18:36:21  38.3N   38.7E ML=4.1  EMSC   EASTERN TURKEY

O: 24JAN2020 19:03:11  38.3N   38.7E mb=4.6  EMSC   EASTERN TURKEY

O: 24JAN2020 18:43:25  38.3N   39.1E ML=4.3  EMSC   EASTERN TURKEY

O: 25JAN2020 00:57:19  38.3N   39.1E mb=4.0  EMSC   EASTERN TURKEY

O: 24JAN2020 22:01:34  38.3N   39.1E mb=4.1  EMSC   EASTERN TURKEY

O: 25JAN2020 01:02:38  38.3N   39.4E ML=4.0  EMSC   EASTERN TURKEY

O: 24JAN2020 18:32:34  38.4N   39.1E ML=4.2  EMSC   EASTERN TURKEY

O: 25JAN2020 06:07:34  38.4N   39.1E ML=4.4  EMSC   EASTERN TURKEY

O: 24JAN2020 20:42:13  38.4N   39.1E mb=4.2  EMSC   EASTERN TURKEY

O: 24JAN2020 18:08:06  38.4N   39.2E ML=4.5  EMSC   EASTERN TURKEY

O: 24JAN2020 19:49:37  38.4N   39.2E ML=4.5  EMSC   EASTERN TURKEY

O: 24JAN2020 17:55:14  38.4N   39.2E Mw=6.8  EMSC   EASTERN TURKEY

O: 25JAN2020 00:48:52  38.4N   39.2E mb=4.2  EMSC   EASTERN TURKEY

O: 24JAN2020 20:45:09  38.5N   39.2E mb=4.5  EMSC   EASTERN TURKEY               

P:  1FEB2020 121531    38.0N   39.0E 3.5-4.8 CAAAA  Turkey                     

P: 16JAN2020 121290    39.0N   40.0E 3.5-4.8 CAAAA  Turkey                     

 

A moderate earthquake of M 4.6 also occurred today near Barstow, California. NEIC reported maximum intensity IV in California at Lucerne Valley, and Barstow and II-III in Daggett, Newberry Springs, Fort Irwin, Helendale, Apple Valley, Boron, Edwards and Victorville among others. It was felt in Nevada, California and Arizona within about 200 km of the epicenter. It was followed by several felt aftershocks. This epicenter is located north of eastern Los Angeles and may be part of the seismicity noted in this summary in previous issues associated with renewed strong activity in New Guinea. The epicenter is located at 103 degrees from the earlier M 6.8 in eastern Turkey, however and this is a more likely triggering source at this time.  This is the strongest non-aftershock of Ridgecrest within about 100 km of this epicenter since an M 5.1 on November 16, 2009. Forecast 121520 had expected today's moderate quake was likely within about 10 km of this epicenter around January 26.

 

O: 25JAN2020 03:26:35  35.1N  117.0W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 25JAN2020 03:09:43  35.1N  117.0W ML=2.9  EMSC   SOUTHERN CALIFORNIA

O: 25JAN2020 03:08:31  35.1N  117.0W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 25JAN2020 03:03:34  35.1N  117.0W Mw=4.7  EMSC   SOUTHERN CALIFORNIA          

P: 26JAN2020 121520    35.1N  117.0W 2.5-4.4 AAAAA  So. California             

 

An earthquake of M 4.5 also occurred today west of Washington State and British Columbia. NEIC reported maximum intensity III in British Columbia at Ucluelet, Port Alberni, Lake Cowichan, Sooke, Parksville and Duncan and in Washington at Sekiu, Clallam, Beaver, Forks. This epicenter is near the longitude of maximum tidal stress for this new moon and, like the earthquakes in Turkey was probably enhanced by those stresses. This is an unusual epicenter and the event occurred within an hour of local solar noon, suggesting the influence of tidal stresses with the new moon. Today's event is the strongest within about 200 km of this epicenter since an M 4.9 on December 30, 2015 about 200 km east of today's epicenter and M 4.8 within about 100 km on January 8, 2015. Forecast 121571 had expected today's activity in this area was likely around January 25. This epicenter is located at the fourth node (90 degrees) from the M 6.8 in Turkay and may have been promoted by energy from that source.

 

O: 24JAN2020 21:35:29  48.6N  125.1W Mw=4.5  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 24JAN2020 21:35:30  48.6N  125.2W MB=4.5  ECAN Bamfield, BC    

P: 25JAN2020 121571    48.0N  123.0W 2.0-3.8 AABAA  Washington state, U.S.