STRONG EARTHQUAKE IN NEW GUINEA PROMOTED BY TIDAL STRESSES

 

EARTHQUAKE SUMMARY FOR  APRIL 10, 2021

 

The strongest earthquake in the world today was an M 6.0-6.1 off the north coast of New Guinea. NEIC reported it was felt in Papua New Guinea with intensity II-III at Madang and Mount Hagen. It was probably promoted by high tidal stresses associated with the New Moon of April 12 as noted in previous issues of this report maximize near this longitude:

 

"The new moon will arrive on April 12 at 02:31 UT. Longitudes which are near local solar midnight at this time are near 37 West and those at local solar noon are near 143 East longitude. In the west these include area of the Atlantic Ocean and in the east much of the western Pacific subduction zone maximizing in Honshu, Japan and the Kuril Islands and in New Guinea, Indonesia. These are the most likely areas to see tidal triggering of seismicity with this new moon. A strong to major quake is possible in the next week to 10 days with this new moon, possibly near these longitudes." (April 8-9, 2021)

 

This epicenter is near the geomagnetic equator and like similar events in the  Celebes Sea and in Java today may have been prompted by the now-concluded strong geomagnetic storm previously identified in this summary as:

 

 

"The geomagnetic field saw active today. The AP level was 17.  High latitude geomagnetic field  saw stormy conditions with AP 35. Strong geomagnetic storms such as this can promote enhanced seismicity in the high latitudes and near the geomagnetic equator and this is likely in the next three days." (April 7-8, 2021)

 

The only events within about 200 km of today's epicenter within the past three years occurred as an M 6.3 on February 7, 2021 and an M 6.2 on January 17, 2019.

Forecast 132591 had expected today's event in New Guinea was likely around April 7.

 

O: 10APR2021 11:38:32   3.5S  145.7E Mw=6.0  EMSC   NEAR N COAST OF NEW GUINEA, PN

P:  7APR2021 132591     7.0S  144.0E 4.0-5.4 BCBAA  Papua New Guinea           

 

A similar M 6.1 occurred several hours earlier in the area of the Celebes Sea south of the Philippines. NEIC reported this earthquake was felt with intensity III in Buayan, Southern Mindanao, Philippines. This is the strongest earthquake in the Celebes Sea region in at least a year. The last within about 200 km of this epicenter with M>=6.1 was an M 6.1 on December 15, 2020 but the last with larger magnitude in this area was an M 6.5 to the west on February 10, 2011. An M 7.3 occurred about 200 km northwest of today's epicenter on January 10, 2017.  Forecast 132574 had expected today's activity to the south was likely around April 9.

 

O: 10APR2021 09:30:44   4.2N  124.6E Mw=6.1  EMSC   CELEBES SEA                  

P:  9APR2021 132574     1.0N  124.0E 4.0-5.6 ACAAA  Mindanao, Philippines       

 

These events followed an M 6.0 felt widely in Java and noted in the previous issue of this summary as:

 

"The earthquake south of Java, Indonesia of M 6.0 is the strongest within about 200 km of  that epicenter since an M 6.0 on July 25, 2015. The last such event with greater magnitude was an M 6.6 on September 28, 1998. Forecast 132592 had expected today's event in this region around April 7." (April 10, 2021)

 

NEIC reported today's earthquake of M 5.1 in Java, Indonesia was felt with intensity II-III in the area(s) of Java, Indonesia at Blitar and Malang.

 

O: 10APR2021 12:49:20   8.9S  112.5E ML=4.2  EMSC   JAVA, INDONESIA

O: 10APR2021 07:00:17   8.4S  112.6E mb=6.0  EMSC   JAVA, INDONESIA              

O: 10APR2021 23:54:58   8.4S  112.5E mb=5.1  EMSC   JAVA, INDONESIA              

P:  7APR2021 132592     9.0S  110.0E 4.0-5.4 BACAA  So. of Java                

 

A moderately strong earthquake of M 5.5 also shook the South Shetland Islands today. It was not reported felt. It is located near the line of maximum longitude in the western hemisphere with the new moon and was probably promoted by strong tidal stresses associated with that alignment. An M 7.1 hit this area on January 23, 2021 and the strongest aftershock to date has been an M 5.5 on January 24, 2021. Forecast 132834 had expected today's event within about 150

km was likely around April 5.

 

O: 10APR2021 07:14:02  62.3S   58.3W Mw=5.5  EMSC   SOUTH SHETLAND ISLANDS       

P:  5APR2021 132834    61.0S   58.0W 3.0-5.6 BAAAA  So. So. America             

 

An unusual earthquake of M 5.0 in the South Pacific Ocean today may also have been related to high tidal stresses. This event is the strongest within about 500 km in at least 30 years. The only recorded event with M>=4 in the general region in this time was an M 4.7 on November 14, 1997 about 550 km  northwest of today's epicenter.

 

O: 10APR2021 17:55:40  40.1S  124.5W mb=5.0  EMSC   SOUTH PACIFIC OCEAN          

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 10APR2021 15:18:24  28.5N   66.5E mb=4.5  EMSC   PAKISTAN

O: 10APR2021 21:49:37  28.3N   67.3E mb=4.2  EMSC   PAKISTAN                      

P:  7APR2021 132640    29.0N   68.0E 3.5-4.9 BAAAA  Pakistan                   

 

O: 10APR2021 18:21:47  31.7N   90.7E mb=4.7  EMSC   EASTERN XIZANG               

P: 10APR2021 132708    30.0N   90.0E 3.8-5.5 ABAAA  Xizang                      

 

O: 10APR2021 17:56:23  42.6N   79.3E mb=4.0  EMSC   KYRGYZSTAN                   

P:  5APR2021 132719    42.0N   82.0E 4.0-5.4 BABAA  Kirgizstan/Xinjiang        

 

INDONESIA AND PHILIPPINES

 

O: 11APR2021 06:52:51   0.4N   97.7E ML=4.0  EMSC   NIAS REGION, INDONESIA       

P:  9APR2021 132577     0.0N   99.0E 4.0-5.4 AABAA  So. Sumatera               

 

O: 10APR2021 11:38:32   3.5S  145.7E Mw=6.0  EMSC   NEAR N COAST OF NEW GUINEA, PN

P:  7APR2021 132591     7.0S  144.0E 4.0-5.4 BCBAA  Papua New Guinea           

 

O: 10APR2021 09:30:44   4.2N  124.6E Mw=6.1  EMSC   CELEBES SEA                  

P:  9APR2021 132574     1.0N  124.0E 4.0-5.6 ACAAA  Mindanao, Philippines      

 

O: 10APR2021 07:15:13   5.4S  103.3E ML=4.0  EMSC   SOUTHERN SUMATRA, INDONESIA  

P:  7APR2021 132593     6.0S  103.0E 4.0-5.6 BAAAA  So. of Sumatera            

 

O: 11APR2021 01:21:06   5.7S  153.2E mb=4.9  EMSC   NEW IRELAND REGION, P.N.G.   

P:  6APR2021 132587     5.0S  153.0E 4.0-5.5 BAAAA  New Britain                 

P:  9APR2021 132594     6.0S  155.0E 4.0-5.4 AABAA  Solomon Islands            

 

O: 10APR2021 16:00:20   7.3S  122.3E mb=4.8  EMSC   FLORES SEA                   

P:  7APR2021 132584     7.0S  123.0E 4.0-5.5 BAAAA  Flores Island area         

 

 

O: 10APR2021 12:49:20   8.9S  112.5E ML=4.2  EMSC   JAVA, INDONESIA

O: 10APR2021 07:00:17   8.4S  112.6E mb=6.0  EMSC   JAVA, INDONESIA              

O: 10APR2021 23:54:58   8.4S  112.5E mb=5.1  EMSC   JAVA, INDONESIA              

P:  7APR2021 132592     9.0S  110.0E 4.0-5.4 BACAA  So. of Java                

P:  7APR2021 132592     9.0S  110.0E 4.0-5.4 BABAA  So. of Java                

 

O: 10APR2021 12:27:02   3.8S  145.5E ML=4.6  EMSC   NEAR N COAST OF NEW GUINEA, PNG.

 

CENTRAL AND SOUTH AMERICA

 

O: 10APR2021 10:04     37.9S   73.7W mb=5.3  GUC    Los Rios at Valdivia; IV in Co

P:  6APR2021 132815    37.0S   74.0W 4.0-5.4 BAAAA  Central Chile              

 

GUC reported this earthquake was felt with intensity  V in  Los Rios at Valdivia; IV in Corral, Los Lagos, Mariquina, Mehuin; II in Futurono, Lago Ranco, Mafil, Rio Bueno and in Araucania with IV in Gorbea, Pucon, Queule, Villarca, III in Carahue, Nueva Imperial, Padre las Casas, Pitrufquen, Saavedra, Temuco, Teodoro Schmidt, Tolten, Vilcun, Chile.

NEIC reported this earthquake of M 5.3 in Bio-Bio, Chile was felt with intensity II-III in the area(s) of  Araucania, Chile at Traiguen, Temuco.

 

O: 10APR2021 16:33     39.5S   73.1W mb=4.7  GUC    BioBio at Los Alamos and Tirul

P:  6APR2021 132815    39.0S   73.0W 4.0-5.4 BAAAA  Central Chile              

 

GUC reported this earthquake was felt with intensity  V in  BioBio at Los Alamos and Tirula, IV in Lebuc, III in Concepcion, Hualpen, Los Angeles, Loa, Talcahuano; IV in La Araucania at Angol, Carahue, Collipulli, Curacautino, Galvannoc, Lautaro, Los Sauces, Lumaco, Nueva Imperial, Traiguen, Victoria, Villarica and V  in Puern and Renaico and III in Los Rios at Panguipulli and Valdivia, Chile.

NEIC reported this earthquake of M 4.7 in Los Lagos, Chile was felt with intensity II-III in the area(s) of Los Lagos, Chile at Valdivia (IV) and Osorno and in Lonchche, Araucania.

 

O: 11APR2021 01:50:08   7.0S   80.3W ML=4.0  EMSC   OFF COAST OF NORTHERN PERU   

P: 10APR2021 132589     6.0S   79.0W 4.0-5.4 AAAAA  No. Peru                   

 

O: 11APR2021 04:21:02   9.3S   71.4W mb=4.1  EMSC   PERU-BRAZIL BORDER REGION    

P:  7APR2021 132785    14.0S   71.0W 4.0-5.9 BCAAA  Central Peru               

 

O: 11APR2021 02:17:35  10.9N   86.4W ML=4.0  EMSC   OFF COAST OF COSTA RICA      

O: 11APR2021 01:42:26  11.0N   86.4W mb=4.6  EMSC   OFF COAST OF COSTA RICA      

P:  7APR2021 132617    13.0N   87.0W 3.5-5.8 BBAAA  Nicaragua                  

 

O: 11APR2021 05:37:18  15.8N   93.9W mb=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO     

P:  8APR2021 132605    16.0N   93.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

 

O: 10APR2021 07:07:36  16.1N   95.2W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P:  8APR2021 132605    16.0N   93.0W 3.5-5.3 AABAA  Chiapas, Mexico             

 

O: 10APR2021 23:22:30  18.4N   69.3W ML=3.2  EMSC   DOMINICAN REPUBLIC REGION    

O: 10APR2021 15:35:05  18.9N   70.3W ML=3.0  EMSC   DOMINICAN REPUBLIC           

O: 11APR2021 03:24:30  19.1N   69.6W ML=3.1  EMSC   DOMINICAN REPUBLIC           

P:  5APR2021 132628    20.0N   69.0W 3.0-4.7 CAAAA  Bahamas/No. Caribbean      

P:  8APR2021 132623    19.0N   71.0W 3.4-5.2 AAAAA  Puerto Rico                

 

O: 10APR2021 22:32:51  18.5N  101.6W ML=4.0  EMSC   GUERRERO, MEXICO             

P:  9APR2021 132615    18.0N  103.0W 3.5-5.4 AABAA  Michoacan, Mexico          

 

O: 11APR2021 06:18:59  18.9N   67.6W Md=3.2  EMSC   PUERTO RICO REGION           

P:  6APR2021 132622    18.0N   67.0W 3.4-5.1 BAAAA  Puerto Rico                

 

O: 10APR2021 10:00:02  19.1N   64.8W Md=3.5  EMSC   VIRGIN ISLANDS REGION        

P:  6APR2021 132612    19.0N   64.0W 3.0-5.1 BAAAA  Leeward Islands            

 

O: 10APR2021 23:47:28  24.1S   67.1W mb=4.2  EMSC   SALTA, ARGENTINA             

P:  8APR2021 132799    24.0S   69.0W 4.0-5.8 AABAA  Coast No. Chile            

 

O: 10APR2021 16:33:53  39.5S   73.1W Mw=4.7  EMSC   LOS LAGOS, CHILE             

P:  6APR2021 132815    39.0S   73.0W 4.0-5.4 BAAAA  Central Chile              

 

 

O: 10APR2021 07:31:02  37.9S   73.7W mb=4.4  EMSC   OFFSHORE BIO-BIO, CHILE

O: 10APR2021 07:52:47  37.9S   73.7W Mw=5.3  EMSC   OFFSHORE BIO-BIO, CHILE      

P:  6APR2021 132815    37.0S   74.0W 4.0-5.4 BAAAA  Central Chile              

 

AFRICA AND EUROPE

 

O: 10APR2021 22:53:58  38.3N   20.7E mb=4.5  EMSC   GREECE                       

P:  9APR2021 132677    39.0N   22.0E 3.0-4.5 AAAAA  No. Greece                 

 

NEIC reported this earthquake of M 4.5 in Greece was felt with intensity II-III in the area(s) of Greece in Kefallinia at Sami and Argostolion.

 

No significant (M>=5) or unusual earthquakes were reported in Europe today.

 

SOUTHWEST PACIFIC

 

O: 10APR2021 09:06:56  17.5S  168.0E mb=4.5  EMSC   VANUATU                      

P:  3APR2021 132796    17.0S  168.0E 4.0-5.5 CAAAA  Vanuatu Islands            

 

No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.

 

OCEAN RIDGES

 

O: 10APR2021 17:55:40  40.1S  124.5W mb=5.0  EMSC   SOUTH PACIFIC OCEAN          

 

O: 10APR2021 07:14:02  62.3S   58.3W Mw=5.5  EMSC   SOUTH SHETLAND ISLANDS       

P:  5APR2021 132834    61.0S   58.0W 3.0-5.6 BAAAA  So. So. America            

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 10APR2021 17:51:32  31.6S  179.8W mb=4.9  EMSC   KERMADEC ISLANDS REGION      

P:  9APR2021 132819    30.0S  178.0W 4.0-5.6 ABBAA  No. Kermadec Islands       

 

O: 10APR2021 17:14:55  33.6S  179.1E ML=3.5  EMSC   SOUTH OF KERMADEC ISLANDS    

O: 10APR2021 23:33:15  34.4S  179.2E ML=3.8  EMSC   SOUTH OF KERMADEC ISLANDS

O: 10APR2021 22:24:39  37.4S  179.9E ML=3.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 10APR2021 14:40:20  37.5S  179.9W mb=4.9  EMSC   EAST OF NORTH ISLAND, N.Z.

O: 11APR2021 01:18:52  37.5S  179.9E ML=3.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O: 10APR2021 12:39:35  37.7S  179.7E ML=4.0  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O: 10APR2021 07:36:04  37.4S  180.0W ML=3.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  5APR2021 132818    37.0S  179.0W 3.5-5.0 BAAAA  E. of North Islands N.Z.   

 

O: 10APR2021 10:46:37  41.5S  174.5E ML=3.6  EMSC   COOK STRAIT, NEW ZEALAND     

O: 10APR2021 10:58:29  41.5S  174.5E ML=4.0  EMSC   COOK STRAIT, NEW ZEALAND

O: 10APR2021 10:58:29  41.4S  174.5E MS=4.1  GEONET Felt with strong intensity

P:  7APR2021 132824    40.0S  175.0E 3.0-4.6 BBAAA  North Island, N.Z.         

 

GEONET reported this earthquake was felt with strong intensity in the area southwest of  Wellington. 6359 reports of felt activity were made to GeoNet - 3296 of weak and 2727 of light intensity came from the area. 319 reports of moderate and 15 of  strong, severe or extreme shaking were noted one person.

 

JAPAN AND KURIL ISLANDS

 

O: 10APR2021 07:36:28  29.3N  129.6E Mw=5.2  EMSC   RYUKYU ISLANDS, JAPAN

O: 10APR2021 13:10:42  29.3N  129.5E mb=4.9  EMSC   RYUKYU ISLANDS, JAPAN

O: 10APR2021 14:09:30  29.3N  129.3E ML=4.0  EMSC   RYUKYU ISLANDS, JAPAN

O: 10APR2021 18:18:14  29.3N  129.5E mb=4.7  EMSC   RYUKYU ISLANDS, JAPAN

O: 10APR2021 20:20:38  29.3N  129.4E mb=4.8  EMSC   RYUKYU ISLANDS, JAPAN

O: 10APR2021 20:40:44  29.9N  129.3E mb=4.8  EMSC   RYUKYU ISLANDS, JAPAN

O: 10APR2021 23:00:21  29.2N  129.4E mb=4.7  EMSC   RYUKYU ISLANDS, JAPAN        

P:  8APR2021 132670    31.0N  131.0E 3.5-5.2 ABAAA  Kyushu, Japan area         

 

O: 11APR2021 06:24:22  24.4N  126.6E mb=4.6  EMSC   RYUKYU ISLANDS, JAPAN        

P:  8APR2021 132641    25.0N  127.0E 4.0-5.5 BAAAA  Ryukyu Islands             

 

O: 10APR2021 20:01:17  45.8N  149.6E mb=4.7  EMSC   KURIL ISLANDS                

P:  4APR2021 132740    45.0N  150.0E 3.5-5.6 CAAAA  So. Kurils                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 10APR2021 18:37:27  32.6N  115.7W Ml=2.1  EMSC   BAJA CALIFORNIA, MEXICO      

O: 10APR2021 13:22:04  32.7N  115.5W ML=3.3  EMSC   SOUTHERN CALIFORNIA          

O: 10APR2021 13:22:04  32.7N  115.5W ML=3.4  ANSS   SOUTHERN CALIFORNIA          

P:  4APR2021 132689    32.9N  115.6W 2.5-4.4 CAAAA  So. California             

 

NEIC reported this earthquake of M 3.4 in Southern California was felt with intensity II-III in the area(s) of Southern California at Neber, Holtville (IV), Calexico, El Centro, Imperial, Lakeside and in Yuma, Arizona.

 

O: 11APR2021 01:09:36  35.9N  117.7W Ml=2.4  EMSC   CENTRAL CALIFORNIA           

P:  8APR2021 132696    35.8N  117.6W 2.5-4.9 BAAAA  So. California             

 

O: 10APR2021 23:57:28  36.5N  114.7W ml=2.5  EMSC   NEVADA                       

P: 10APR2021 132673    37.3N  114.9W 2.5-4.5 AAAAA  Nevada area                

 

O: 10APR2021 17:55:09  37.6N  118.9W Md=2.0  EMSC   CENTRAL CALIFORNIA            

P:  8APR2021 132652    37.5N  118.6W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 10APR2021 11:50:13  37.6N  121.7W ML=2.7  EMSC   NORTHERN CALIFORNIA          

O: 10APR2021 11:50:13  37.6N  121.7W ML=2.9  ANSS   NORTHERN CALIFORNIA           

P:  8APR2021 132661    37.4N  121.8W 2.5-4.7 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.9 in the San Francisco, California was felt with intensity II-III in the area(s) of San Francisco, California at Livermore, Pleasanton, Union City, San Ramon, Brentwood, Sunnyvale, San jose  and Walnut Creek.

 

O: 10APR2021 11:01:59  38.8N  122.8W Md=2.0  EMSC   NORTHERN CALIFORNIA

O: 10APR2021 11:01:59  38.8N  122.8W Md=2.0  EMSC   NORTHERN CALIFORNIA

O: 10APR2021 14:13:21  38.5N  122.7W ML=3.0  EMSC   NORTHERN CALIFORNIA          

O: 10APR2021 14:13:21  38.5N  122.7W ML=3.3  ANSS   NORTHERN CALIFORNIA          

P:  7APR2021 132662    38.7N  122.7W 2.5-4.6 BAAAA  Central California         

 

NEIC reported this earthquake of M 3.3 in Northern California was felt with intensity II-III in the area(s) of Northern California at Santa Rosa, Calistoga, Deer Park, Kenwood, Angwin, Saint Helena.

 

O: 10APR2021 20:39:53  38.2N  117.9W ml=2.1  EMSC   NEVADA                       

P:  8APR2021 132652    37.5N  118.6W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 10APR2021 08:16:32  40.2N  121.1W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P:  6APR2021 132731    40.7N  121.3W 2.5-4.5 BAAAA  Northern California        

 

 

ALASKA

 

O: 10APR2021 12:45:44  60.0N  149.3W ML=3.0  EMSC   KENAI PENINSULA, ALASKA      

P:  8APR2021 132769    60.9N  147.4W 3.2-5.1 AAAAA  Central Alaska             

 

O: 10APR2021 21:35:28  66.3N  157.3W ML=3.4  EMSC   NORTHERN ALASKA              

P:  5APR2021 132772    64.0N  154.0W 3.0-5.0 BCBAA  Northern Alaska            

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 10APR2021 07:38:15  47.5N  121.6W Ml=2.8  EMSC   WASHINGTON                   

P:  6APR2021 132742    47.7N  120.3W 2.0-4.4 BAAAA  Washington state, U.S.     

 

NEIC reported this earthquake of M 2.8 in Washington State was felt with intensity II-III in the area(s) of Washington State at North Bend, Snoqualmie, Issaquah, Maple Valley, Black Diamond, Duvall, Redmond, Kent.

 

O: 10APR2021 07:34:14  48.9N  125.2W Ml=3.3  EMSC   VANCOUVER ISLAND, CANADA REGIO

P:  3APR2021 132741    49.0N  126.0W 2.8-5.1 CAAAA  Vancouver Island area      

 

NEIC reported this earthquake of M 3.3 in Vancouver Island, Canada was felt with intensity II-III in the area(s) of British Columbia at Icluelet and Victoria.

 

ROCKY MOUNTAINS REGION

 

O: 11APR2021 03:02:03  39.3N  106.8W ML=2.8  EMSC   COLORADO                     

P: 10APR2021 132666    39.2N  108.4W 2.0-3.9 AABAA  Colorado area              

 

NEIC reported this earthquake of M 2.8 in Northern Colorado was felt with intensity II-III in the area(s) of Northern Colorado at Aspen.

 

O: 10APR2021 17:08:29  44.2N  115.1W ML=2.6  EMSC   SOUTHERN IDAHO

O: 10APR2021 08:52:15  44.3N  115.0W Ml=2.2  EMSC   SOUTHERN IDAHO

O: 10APR2021 08:56:51  44.1N  115.1W Ml=2.7  EMSC   SOUTHERN IDAHO               

P:  6APR2021 132723    44.4N  115.1W 2.0-4.2 BAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 10APR2021 16:07:39  29.2N   97.6W mb=2.6  EMSC   SOUTHERN TEXAS                

 

O: 11APR2021 02:00:07  34.4N   97.5W ML=2.5  EMSC   OKLAHOMA

O: 10APR2021 12:26:23  35.1N   95.4W ML=2.4  EMSC   OKLAHOMA

O: 10APR2021 22:07:37  36.0N   98.5W ML=2.0  EMSC   OKLAHOMA                     

O: 10APR2021 09:54:04  34.4N   97.4W ML=2.1  EMSC   OKLAHOMA                     

P: 10APR2021 132700    35.0N   97.0W 2.0-4.3 AAAAA  Southern Plains            

 

HAWAII

 

O: 11APR2021 00:04:20  19.3N  155.4W ML=3.6  EMSC   ISLAND OF HAWAII, HAWAII

O: 11APR2021 06:08:51  19.2N  155.5W ML=3.7  EMSC   ISLAND OF HAWAII, HAWAII     

P:  9APR2021 132610    19.9N  156.1W 3.0-4.7 AAAAA  Hawaii                     

 

NEIC reported these earthquakes of M 3.0 and 3.1 in Hawaii were felt with intensity II-III in the area(s) of Hawaii at Naalehu, Captain Cook, Volcano, Mountain View, Kealakekua, Kailua Kona and Kamuela.

 

STRONG EARTHQUAKE IN NEW GUINEA PROMOTED BY TIDAL STRESSES

 

EARTHQUAKE SUMMARY FOR  APRIL 10, 2021

 

The strongest earthquake in the world today was an M 6.0-6.1 off the north coast of New Guinea. NEIC reported it was felt in Papua New Guinea with intensity II-III at Madang and Mount Hagen. It was probably promoted by high tidal stresses associated with the New Moon of April 12 as noted in previous issues of this report maximize near this longitude:

 

"The new moon will arrive on April 12 at 02:31 UT. Longitudes which are near local solar midnight at this time are near 37 West and those at local solar noon are near 143 East longitude. In the west these include area of the Atlantic Ocean and in the east much of the western Pacific subduction zone maximizing in Honshu, Japan and the Kuril Islands and in New Guinea, Indonesia. These are the most likely areas to see tidal triggering of seismicity with this new moon. A strong to major quake is possible in the next week to 10 days with this new moon, possibly near these longitudes." (April 8-9, 2021)

 

This epicenter is near the geomagnetic equator and like similar events in the  Celebes Sea and in Java today may have been prompted by the now-concluded strong geomagnetic storm previously identified in this summary as:

 

 

"The geomagnetic field saw active today. The AP level was 17.  High latitude geomagnetic field  saw stormy conditions with AP 35. Strong geomagnetic storms such as this can promote enhanced seismicity in the high latitudes and near the geomagnetic equator and this is likely in the next three days." (April 7-8, 2021)

 

The only events within about 200 km of today's epicenter within the past three years occurred as an M 6.3 on February 7, 2021 and an M 6.2 on January 17, 2019.

Forecast 132591 had expected today's event in New Guinea was likely around April 7.

 

O: 10APR2021 11:38:32   3.5S  145.7E Mw=6.0  EMSC   NEAR N COAST OF NEW GUINEA, PN

P:  7APR2021 132591     7.0S  144.0E 4.0-5.4 BCBAA  Papua New Guinea           

 

A similar M 6.1 occurred several hours earlier in the area of the Celebes Sea south of the Philippines. NEIC reported this earthquake was felt with intensity III in Buayan, Southern Mindanao, Philippines. This is the strongest earthquake in the Celebes Sea region in at least a year. The last within about 200 km of this epicenter with M>=6.1 was an M 6.1 on December 15, 2020 but the last with larger magnitude in this area was an M 6.5 to the west on February 10, 2011. An M 7.3 occurred about 200 km northwest of today's epicenter on January 10, 2017.  Forecast 132574 had expected today's activity to the south was likely around April 9.

 

O: 10APR2021 09:30:44   4.2N  124.6E Mw=6.1  EMSC   CELEBES SEA                  

P:  9APR2021 132574     1.0N  124.0E 4.0-5.6 ACAAA  Mindanao, Philippines       

 

These events followed an M 6.0 felt widely in Java and noted in the previous issue of this summary as:

 

"The earthquake south of Java, Indonesia of M 6.0 is the strongest within about 200 km of  that epicenter since an M 6.0 on July 25, 2015. The last such event with greater magnitude was an M 6.6 on September 28, 1998. Forecast 132592 had expected today's event in this region around April 7." (April 10, 2021)

 

NEIC reported today's earthquake of M 5.1 in Java, Indonesia was felt with intensity II-III in the area(s) of Java, Indonesia at Blitar and Malang.

 

O: 10APR2021 12:49:20   8.9S  112.5E ML=4.2  EMSC   JAVA, INDONESIA

O: 10APR2021 07:00:17   8.4S  112.6E mb=6.0  EMSC   JAVA, INDONESIA              

O: 10APR2021 23:54:58   8.4S  112.5E mb=5.1  EMSC   JAVA, INDONESIA              

P:  7APR2021 132592     9.0S  110.0E 4.0-5.4 BACAA  So. of Java                

 

A moderately strong earthquake of M 5.5 also shook the South Shetland Islands today. It was not reported felt. It is located near the line of maximum longitude in the western hemisphere with the new moon and was probably promoted by strong tidal stresses associated with that alignment. An M 7.1 hit this area on January 23, 2021 and the strongest aftershock to date has been an M 5.5 on January 24, 2021. Forecast 132834 had expected today's event within about 150

km was likely around April 5.

 

O: 10APR2021 07:14:02  62.3S   58.3W Mw=5.5  EMSC   SOUTH SHETLAND ISLANDS       

P:  5APR2021 132834    61.0S   58.0W 3.0-5.6 BAAAA  So. So. America             

 

An unusual earthquake of M 5.0 in the South Pacific Ocean today may also have been related to high tidal stresses. This event is the strongest within about 500 km in at least 30 years. The only recorded event with M>=4 in the general region in this time was an M 4.7 on November 14, 1997 about 550 km  northwest of today's epicenter.

 

O: 10APR2021 17:55:40  40.1S  124.5W mb=5.0  EMSC   SOUTH PACIFIC OCEAN          

 

ANTIPODAL EVENTS IN JAVA AND LA SOUFRIERE, CARIBBEAN POSSIBLY RELATED

 

EARTHQUAKE SUMMARY FOR  APRIL 9, 2021

 

The strongest geophysical activity in the world today occurred at the antipodal regions of Java and St. Vincent and the Grenadines. These may have been related  to energy from the tropical cyclones Odette and Seroja which have been in the region south of Java over the past several days and could have also influenced seismicity in the eastern Caribbean. TC Seroja passed over the exact antipode of La Soufriere on April 7-8.

 

An eruption of La Soufriere on St. Vincent and the Grenadines occurred today, the first such eruption since 1979. As many as 20,000 were evacuated as volcanic bombs, sulfur, smoke and ash fell from the eruption. A second eruption followed about 6 hours later.

 

This eruption was followed by the largest earthquake of the day - an M 6.0 in Java, Indonesia. This is located near the antipode of the eruption and may have been promoted by energy from that earlier event. NEIC reported this earthquake was felt with maximum intensity V in Java at Malang; IV in Srandakan and II-III in Singosari, Kertosono, Mojokerto, Surabaya, Kasihan and in Kula, Bali, Indonesia. BMG reported this earthquake with Magnitude M 5.6. That agency reported maximum intensity V at Ruren, IV at Karangkates, Malang, Bitar; III-IV in Kedin, Trenggalek, Jombang, III in Nganjuk, Ponorogo, Madiun, Yogyakarta, Ngawi, Lombok Barat, Mataram, Kuta, Jimbaran, Denpasar and II in Mojoketo, Klaren, Lombok Utara, Sumbawa, Tabanen, Klungkung and Banjamegara. This activity near the geomagnetic equator may be related to the strong geomagnetic storm of April 7. This summary had noted this in previous issues as:

 

 

"The geomagnetic field saw active today. The AP level was 17.  High latitude geomagnetic field  saw stormy conditions with AP 35. Strong geomagnetic storms such as this can promote enhanced seismicity in the high latitudes and near the geomagnetic equator and this is likely in the next three days." (April 7-8, 2021)

 

It may also be related to tidal stresses associated with the coming New Moon  as forecast in previous issues of this summary as:

 

"The new moon will arrive on April 12 at 02:31 UT. Longitudes which are near local solar midnight at this time are near 37 West and those at local solar noon are near 143 East longitude. In the west these include area of the Atlantic Ocean and in the east much of the western Pacific subduction zone maximizing in Honshu, Japan and the Kuril Islands and in New Guinea, Indonesia. These are the most likely areas to see tidal triggering of seismicity with this new moon. A strong to major quake is possible in the next week to 10 days with this new moon, possibly near these longitudes." (April 8-9, 2021)

 

Tropical Cyclones Seroja and Odette may also have influenced the timing of the earthquake in Java as previously reported in this summary:

 

"TC Seroja continued near Timor, Indonesia today with winds up to 70 kts. It is expected to track to the southwest over the next several days and may help enhance seismicity in the area of Timor." (April 6-8, 2021)

 

and

 

"TC Seroja continued south of Java, Indonesia today with winds up to 75 kts. It is expected to track to the southwest over the next several days and may help enhance seismicity in the area of Java to the north." (April 9, 2021)

 

"Tropical Cyclone Odette (27S) continued today in the area south of Sumatra with winds up to 65 kts. It is expected to track to the east and south over the next several days." (April 8-9, 2021)

 

The eruption of La Soufriere occurred at the antipode of Tropical Cyclone Seroja, perhaps supporting the antipodal occurrence of the events in the Caribbean and Java today.

 

Seismic enhancement in the region of the Windward Islands had been expected in forecast 132626 in early April to the south of the eruption of La Soufriere. This epicenter is at the third node (120 degrees) from both the M 7.3 off North Island, New Zealand and the M 8.1 in the Kermadec Islands of March 4, 2021 and was probably enhanced by energy from those sources.

 

O:  9APR2021 12:40:00  13.2N   61.1W ML=5.5  NEWS   ERUPTION OF SOUFRIERE, GRENADI

P:  4APR2021 132626    11.0N   62.0W 3.4-5.1 BCAAA  Windward Islands           

 

The earthquake south of Java, Indonesia of M 6.0 is the strongest within about 200 km of that epicenter since an M 6.0 on July 25, 2015. The last such event with greater magnitude was an M 6.6 on September 28, 1998. Forecast 132592 had expected today's event in this region around April 7.

 

O: 10APR2021 07:00:17   8.4S  112.6E mb=6.0  EMSC   JAVA, INDONESIA              

P:  7APR2021 132592     9.0S  110.0E 4.0-5.4 BABAA  So. of Java                

 

An unusual earthquake of M 4.4 shook areas of Romania today. NEIC reported this earthquake of M 4.4 in Romania was felt with intensity II-III in the area(s) of Romania at Brasov, Stefanestii, Bucharest, Popesti-Leordeni, Bragadiru, Lifov, and in Razgrad, Bulgaria. The only earthquake in Romania of larger magnitude since April, 2020 was an M 4.9 on April 24, 2020. Forecast 132738 had expected today's event within about 50 km of this epicenter was likely around April 6. This epicenter is located at 144 degrees from the series of events including the M 7.7 in the Loyalty Islands of early February and was probably promoted by energy from that source.

 

O:  9APR2021 18:36:47  45.8N   26.6E mb=4.4  EMSC   ROMANIA                      

P:  5APR2021 132738    46.0N   26.0E 3.0-5.0 BAAAA  Romania/NW Turkey          

 

An earthquake of M 3.3 in northern New Mexico was felt in the epicentral area today. The only earthquake within about 100 km of this epicenter with M>=3.3 in New Mexico in the past 10 years was an M 3.7 near today's epicenter on July 30, 2020. Earthquakes of M 3.5-3.6 occurred about 100 km south of today's event on October 20, 2016 and October 17, 2011 and two events of M 3.5 and 3.7 hit the area in September, 2009 and June, 2008. Forecast 132665 had expected enhanced regional activity around April 5.

 

O:  9APR2021 14:49:16  36.3N  106.8W ML=3.3  EMSC   NEW MEXICO                   

P:  5APR2021 132665    36.9N  105.1W 2.0-4.1 BABAA  Colorado area              

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 10APR2021 04:47:20  22.7N  121.4E mb=4.4  EMSC   TAIWAN REGION                

O:  9APR2021 09:10:26  24.8N  122.1E ML=4.2  TAI    Hualien, Taiwan              

O: 10APR2021 04:47:21  22.7N  121.3E ML=4.4  TAI    Hualien, Taiwan              

P:  9APR2021 132644    23.0N  121.0E 4.0-5.6 ABAAA  Taiwan                     

 

CWB reported this earthquake of M 4.2 was felt with intensity II in Yilan and I in Taipei, Hualien and Hsinchu Counties, Taiwan.

The M 4.4 was felt with intensity III in Taitung, and I in Hualien and Pingtung Counties, Taiwan.

 

No significant (M>=5) or unusual earthquakes were reported in Asia today.

 

INDONESIA AND PHILIPPINES

 

O:  9APR2021 15:10:46   0.5S  131.9E ML=4.0  EMSC   NEAR N COAST OF PAPUA, INDONES

P:  9APR2021 132600     5.0S  130.0E 4.0-5.5 ACBAA  West Irian, PNG            

 

O:  9APR2021 17:55:04   2.4N  128.5E mb=4.5  EMSC   HALMAHERA, INDONESIA         

P:  8APR2021 132572     4.0N  128.0E 4.0-5.6 ABAAA  Halmahera                  

 

O: 10APR2021 00:04:57   2.8S  101.3E ML=4.4  EMSC   SOUTHERN SUMATRA, INDONESIA  

P:  2APR2021 132593     4.0S  102.0E 4.0-5.5 CBAAA  So. of Sumatera            

 

O: 09APR2021 15:14:29   4.8N   96.2E ML=4.7  EMSC   NORTHERN SUMATRA, INDONESIA

O:  9APR2021 08:08:59   3.1N   96.4E mb=4.3  EMSC   NORTHERN SUMATRA, INDONESIA  

P:  7APR2021 132576     4.0N   96.0E 4.0-5.8 AAAAA  Nicobar Islands            

 

O:  9APR2021 13:39:47   6.2N  126.0E ML=4.2  EMSC   MINDANAO, PHILIPPINES        

P:  9APR2021 132573     6.0N  127.0E 4.0-5.8 AAAAA  Halmahera                  

 

O:  9APR2021 06:42:46   7.7S  127.7E ML=4.5  EMSC   KEPULAUAN BARAT DAYA, INDONESI

P:  5APR2021 132580     6.0S  128.0E 4.0-5.4 BBAAA  Banda Sea                  

 

O:  9APR2021 20:09:06   8.3S  117.3E ML=4.0  EMSC   SUMBAWA REGION, INDONESIA    

P:  8APR2021 132596     8.0S  117.0E 4.0-5.4 AAAAA  Sumbawa Island area        

 

O: 10APR2021 07:00:17   8.4S  112.6E mb=6.0  EMSC   JAVA, INDONESIA              

P:  7APR2021 132592     9.0S  110.0E 4.0-5.4 BABAA  So. of Java                

 

CENTRAL AND SOUTH AMERICA

 

O: 10APR2021 05:16:30   9.6N   84.9W ML=4.0  EMSC   COSTA RICA                   

P:  5APR2021 132603    10.0N   84.0W 3.5-5.5 BAAAA  Caribbean Sea              

 

O:  9APR2021 12:40:00  13.2N   61.1W ML=5.5  NEWS   ERUPTION OF SOUFRIERE, GRENADI

P:  4APR2021 132626    11.0N   62.0W 3.4-5.1 BCAAA  Windward Islands           

 

O: 09APR2021 07:36:58  17.0N   99.6W ML=4.3  EMSC   GUERRERO, MEXICO

O:  9APR2021 22:42:22  16.8N   98.8W ML=4.0  EMSC   GUERRERO, MEXICO             

P:  6APR2021 132621    17.0N   98.0W 3.5-5.2 BAAAA  Oaxaca, Mexico             

 

O:  9APR2021 08:18:41  17.0N   93.9W ML=4.2  EMSC   OAXACA, MEXICO               

P:  8APR2021 132605    16.0N   93.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O:  9APR2021 19:00:11  27.6N  111.6W ML=3.6  EMSC   GULF OF CALIFORNIA           

P:  9APR2021 132632    28.0N  112.0W 3.5-5.3 AAAAA  Gulf of California         

 

O:  9APR2021 06:53:18  29.7S   69.6W Mw=4.3  EMSC   SAN JUAN, ARGENTINA          

P:  6APR2021 132798    29.0S   68.0W 4.0-5.6 BABAA  Argentina                  

P:  7APR2021 132812    31.0S   70.0W 4.0-5.8 ABAAA  Central Chile              

 

 

AFRICA AND EUROPE

 

O:  9APR2021 18:36:47  45.8N   26.6E mb=4.4  EMSC   ROMANIA                      

P:  5APR2021 132738    46.0N   26.0E 3.0-5.0 BAAAA  Romania/NW Turkey          

 

O: 10APR2021 05:55:01  46.5N   14.4E ML=2.9  EMSC   AUSTRIA                      

P:  9APR2021 132710    45.0N   16.0E 3.0-5.1 ABBAA  Adriatic Sea               

 

No significant (M>=5) or unusual earthquakes were reported in Europe today.

 

SOUTHWEST PACIFIC

 

O: 09APR2021 12:00:40  18.0S  178.4W mb=4.2  EMSC   FIJI REGION

O:  9APR2021 11:24:29  17.7S  178.7W Mw=5.2  EMSC   FIJI REGION                   

P:  5APR2021 132795    17.0S  179.0W 4.0-5.6 BAAAA  Tonga Islands              

 

O: 10APR2021 01:32:18  23.5S  171.8E mb=4.6  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 10APR2021 04:15:54  20.0S  169.2E Mw=5.1  EMSC   VANUATU                      

O:  9APR2021 12:51:29  23.4S  171.8E Mw=5.0  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P:  6APR2021 132800    23.0S  171.0E 4.0-5.4 BAAAA  Loyalty Islands            

 

OCEAN RIDGES

 

No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  9APR2021 20:43:14  30.2S  180.0E ML=4.6  EMSC   KERMADEC ISLANDS REGION      

P:  9APR2021 132801    28.0S  177.0W 4.0-5.6 ACBAA  No. Kermadec Islands       

 

O:  9APR2021 18:36:11  37.7S  179.8E ML=3.7  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  5APR2021 132819    38.0S  177.0E 3.0-4.6 BABAA  North Island, N.Z.         

 

O:  9APR2021 11:14:16  39.8S  175.9E ML=3.9  EMSC   NORTH ISLAND OF NEW ZEALAND  

P:  7APR2021 132824    40.0S  175.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

O:  9APR2021 11:21:30  40.1S  173.1E ML=3.6  EMSC   COOK STRAIT, NEW ZEALAND     

P:  7APR2021 132824    40.0S  175.0E 3.0-4.6 AABAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

O: 10APR2021 01:54:56  29.3N  129.3E mb=4.4  EMSC   RYUKYU ISLANDS, JAPAN

O: 10APR2021 05:07:30  29.3N  129.3E ML=4.4  EMSC   RYUKYU ISLANDS, JAPAN

O: 10APR2021 06:52:11  29.3N  129.5E ML=4.8  EMSC   RYUKYU ISLANDS, JAPAN

O:  9APR2021 22:07:32  29.3N  129.4E Mw=5.3  EMSC   RYUKYU ISLANDS, JAPAN         

P:  5APR2021 132635    29.0N  131.0E 4.0-5.4 BABAA  Kyushu Japan               

P:  8APR2021 132670    31.0N  131.0E 3.5-5.2 ABBAA  Kyushu, Japan area         

 

O:  9APR2021 16:59:30  37.7N  141.8E ML=4.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  7APR2021 132683    38.0N  140.0E 4.0-5.6 AABAA  Off East Coast Honshu      

 

NEIC reported this earthquake of M 4.3 in Iwate, Japan was felt with intensity II-III in the area(s) of Iwate, Japan at Miyako.

 

O:  9APR2021 08:54:08  40.0N  141.5E mb=4.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  9APR2021 132716    40.0N  142.0E 3.5-5.6 AAAAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 09APR2021 20:29:53  33.1N  115.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O:  9APR2021 08:47:05  32.8N  115.8W Ml=2.1  EMSC   SOUTHERN CALIFORNIA          

P:  4APR2021 132689    32.9N  115.6W 2.5-4.4 BAAAA  So. California             

 

O: 10APR2021 03:57:57  34.2N  116.5W ML=2.8  EMSC   SOUTHERN CALIFORNIA          

O: 10APR2021 03:57:57  34.2N  116.5W ML=3.0  ANSS   SOUTHERN CALIFORNIA          

P:  8APR2021 132694    34.3N  116.5W 2.5-4.4 AAAAA  So. California             

 

NEIC reported this earthquake of M 3.0 in Yucca Valley, Southern California was felt with intensity II-III in the area(s) of Yucca Valley, Southern California at Joshua Tree, Morongo Valley, Twentynine Palms, San Bernardino, Apple Valley, Desert Center, Fallbrook, Chino and Irvine.

 

O:  9APR2021 21:31:31  35.9N  115.3W ml=2.1  EMSC   NEVADA                       

P: 10APR2021 132673    37.3N  114.9W 2.5-4.5 ABAAA  Nevada area                

P: 10APR2021 132694    35.5N  116.4W 2.5-4.5 AAAAA  So. California             

 

O:  9APR2021 22:54:49  35.9N  117.7W Ml=2.2  EMSC   CENTRAL CALIFORNIA           

P:  8APR2021 132696    35.8N  117.6W 2.5-4.9 AAAAA  So. California             

 

O:  9APR2021 23:12:21  40.3N  123.2W Md=2.3  EMSC   NORTHERN CALIFORNIA          

P:  5APR2021 132663    39.7N  123.7W 2.5-4.4 BAAAA  Central California         

 

O:  9APR2021 10:10:56  40.4N  124.4W Md=2.1  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  7APR2021 132732    40.6N  124.9W 2.5-4.5 AAAAA  Off Coast of No. Calif     

 

O:  9APR2021 13:08:50  40.9N  121.9W Md=2.0  EMSC   NORTHERN CALIFORNIA          

P:  6APR2021 132731    40.7N  121.3W 2.5-4.5 BAAAA  Northern California        

 

 

ALASKA

 

No events of M>=3 were located in Alaska today.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  9APR2021 13:42:43  51.2N  131.2W MB=3.6  ECAN Bella Bella, BC                

P:  7APR2021 132753    50.4N  130.2W 3.0-5.0 AAAAA  British Colombia           

 

ROCKY MOUNTAINS REGION

 

O:  9APR2021 21:26:33  31.6N  104.3W ML=2.7  EMSC   WESTERN TEXAS                

P:  7APR2021 132687    32.6N  104.6W 2.0-3.9 AAAAA  SW U.S.A                   

 

O:  9APR2021 14:49:16  36.3N  106.8W ML=3.3  EMSC   NEW MEXICO                   

P:  5APR2021 132665    36.9N  105.1W 2.0-4.1 BABAA  Colorado area              

 

O:  9APR2021 12:34:29  44.3N  115.1W Ml=2.7  EMSC   SOUTHERN IDAHO               

P:  6APR2021 132723    44.4N  115.1W 2.0-4.2 BAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 10APR2021 05:49:07  29.2N   97.7W mb=3.2  EMSC   SOUTHERN TEXAS               

 

O:  9APR2021 08:15:25  35.2N   95.3W ML=2.0  EMSC   OKLAHOMA                     

P: 10APR2021 132700    35.0N   97.0W 2.0-4.3 AABAA  Southern Plains            

 

HAWAII

 

No earthquakes of M>=3 were located in Hawaii.

MODERATELY STRONG QUAKE IN CENTRAL ALASKA

 

EARTHQUAKE SUMMARY FOR  APRIL 8, 2021

 

The strongest earthquake in the world today was an M 5.5 in Central Alaska near Cantwell. NEIC reported maximum intensity with this quake was V in Cantwell; IV in Matanuska-Sustina border, Healy, Talkeetna, and III in Anderson, Fairbanks, Delta Junction, Glennallen, Clear and Palmer, Alaska. This is the strongest earthquake within about 200 km of this epicenter in Central Alaska since an M 7.9 in the Denali area of Alaska of November 3, 2002. An earthquake of M 7.0 occurred about 250 km southwest of this in the Anchorage, Alaska area on November 30, 2018 and as an M 6.8 on December 4, 2012. Forecast 132771 had expected today's event within about 25 km of this epicenter was likely in early April around April 4. The last earthquake in Alaska outside the Andreanof Islands of M>=5.5 occurred with the M 7.6 in the Alaska Peninsula on October 19, 2020. The last such event in central, southern or eastern Alaska was  the M 7.0 near Anchorage on November 30, 2018. In the previous issue of this summary, increased seismicity in Alaska had been noted as:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.9 in the western Fox Islands, Aleutians, Alaska. It was not reported felt in this remote area. This is the strongest earthquake in the Fox Islands in the past four months - since an M 6.4 on December 1, 2020 about 50 km to the east of today's epicenter. Forecast 132755 had expected today's event was likely in this area of the Fox Islands around April 4. Seismicity in Alaska has been quiet in recent weeks and today's event may preceded enhanced regional seismicity associated with the strong geomagnetic storm at high latitudes which reached maximum near this time. This summary had noted this geomagnetic storm as:" (April 8, 2021)

 

 

"The geomagnetic field saw active today. The AP level was 17.  High latitude geomagnetic field  saw stormy conditions with AP 35. Strong geomagnetic storms such as this can promote enhanced seismicity in the high latitudes and near the geomagnetic equator and this is likely in the next three days." (April 7-8, 2021)

 

Today's event in Central Alaska was located at 103 degrees from the M 7.3 off North Island, New Zealand of March 4. Triggering of seismicity at this distance from large earth disturbances is common and energy from the New Zealand event probably helped promote today's earthquake in Alaska. Strong aftershocks in New Zealand both north of North Island and in the Kermadec Islands are still continuing.

 

O:  8APR2021 17:10:18  63.2N  148.7W Mw=5.5  EMSC   CENTRAL ALASKA               

P:  4APR2021 132771    63.0N  148.6W 3.2-5.0 BAAAA  Central Alaska             

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O:  8APR2021 12:53:41  30.8N   71.2E ML=4.0  EMSC   PAKISTAN                     

P:  7APR2021 132640    29.0N   68.0E 3.5-4.9 ABBAA  Pakistan                   

 

O:  9APR2021 05:54:46  42.6N   79.8E mb=4.1  EMSC   EASTERN KAZAKHSTAN           

P:  5APR2021 132719    42.0N   82.0E 4.0-5.4 BABAA  Kirgizstan/Xinjiang        

 

No significant (M>=5) or unusual earthquakes were reported in Asia today.

 

INDONESIA AND PHILIPPINES

 

O:  8APR2021 17:48:57   1.1N  124.2E ML=4.0  EMSC   MINAHASA, SULAWESI, INDONESIA

P:  9APR2021 132574     1.0N  124.0E 4.0-5.6 AAAAA  Mindanao, Philippines      

 

O:  8APR2021 17:40:41   3.8N   95.8E mb=4.4  EMSC   OFF W COAST OF NORTHERN SUMATR

P:  7APR2021 132576     4.0N   96.0E 4.0-5.8 AAAAA  Nicobar Islands            

 

O:  9APR2021 04:59:07   4.3N  126.2E ML=4.3  EMSC   KEPULAUAN TALAUD, INDONESIA  

P: 10APR2021 132574     6.0N  126.0E 4.0-5.4 ABAAA  Mindanao, Philippines      

 

O:  9APR2021 06:42:46   7.7S  127.7E ML=4.5  EMSC   KEPULAUAN BARAT DAYA, INDONESI

P:  5APR2021 132580     6.0S  128.0E 4.0-5.4 BBAAA  Banda Sea                  

 

O:  8APR2021 21:40:57  10.4S  113.6E ML=4.1  EMSC   SOUTH OF JAVA, INDONESIA     

P:  7APR2021 132592     9.0S  110.0E 4.0-5.4 ABCAA  So. of Java                

 

No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.

 

CENTRAL AND SOUTH AMERICA

 

O:  9APR2021 06:53     29.7S   69.8W mb=4.5  GUC    Coquimbo at La Higuera; III in

P:  7APR2021 132812    31.0S   70.0W 4.0-5.8 AAAAA  Central Chile              

 

GUC reported this earthquake was felt with intensity  IV in  Coquimbo at La Higuera; III in Andacollo, Paiguano and II in Rio Hurtado and in Atacama with III in San Felix, El Transito, Conay, Alto del Carmen and Vallenar, Chile.

 

O:  9APR2021 02:02     33.8S   70.3W mb=4.6  GUC    O'Higgins at Codegua, Graneros

P:  4APR2021 132813    33.0S   71.0W 4.0-5.8 BAAAA  Central Chile              

 

GUC reported this earthquake was felt with intensity  IV in  O'Higgins at Codegua, Graneros, La Estrella, Machale, Mostazal, Rancagua,Rengo, San Fernando; III in Marchihue,and II in Chimbarongo; in Maujle with III in Rauco, II in Constitucion, Curico, Hualane and Sagrada Familia; in Santiago with IV in Curacavi; III in El Monte, Pedro Aguirre Cerda and Santiago and II in Puente Alto and San Jose de Maipo; and in Valparaiso with III in Quilotta and II in Olmue and San Antonio, Chile.

 

O:  8APR2021 21:40:57  10.4S  113.6E ML=4.1  EMSC   SOUTH OF JAVA, INDONESIA     

P:  7APR2021 132592     9.0S  110.0E 4.0-5.4 ABCAA  So. of Java                

 

O:  8APR2021 07:59:43   7.5S   74.6W mb=4.3  EMSC   NORTHERN PERU                

P: 10APR2021 132589     6.0S   79.0W 4.0-5.4 ABCAA  No. Peru                   

 

O:  8APR2021 09:08:29   1.4S   80.4W ML=4.4  EMSC   NEAR COAST OF ECUADOR        

P:  9APR2021 132583     1.0S   81.0W 4.0-5.4 AAAAA  Ecuador                    

 

O: 08APR2021 23:28:11  15.0N   94.5W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 09APR2021 02:32:17  15.5N   94.9W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 08APR2021 07:01:28  16.5N   95.2W ML=4.1  EMSC   OAXACA, MEXICO

O: 08APR2021 10:18:00  16.5N   95.7W ML=4.2  EMSC   OAXACA, MEXICO

O:  8APR2021 17:59:19  14.7N   93.4W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO     

P:  9APR2021 132604    14.0N   94.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O:  8APR2021 22:12:07  17.4N   68.7W ML=3.5  EMSC   DOMINICAN REPUBLIC REGION    

P:  6APR2021 132622    18.0N   67.0W 3.4-5.1 AABAA  Puerto Rico                

 

O:  8APR2021 17:00:14  18.0N   97.6W ML=4.4  EMSC   OAXACA, MEXICO               

P:  6APR2021 132621    17.0N   98.0W 3.5-5.2 AAAAA  Oaxaca, Mexico             

 

O:  8APR2021 09:08:13  18.5N   69.0W ML=3.0  EMSC   DOMINICAN REPUBLIC           

O: 09APR2021 02:32:05  18.8N   69.6W ML=3.3  EMSC   DOMINICAN REPUBLIC

P:  8APR2021 132623    19.0N   71.0W 3.4-5.2 AABAA  Puerto Rico                

 

O:  9APR2021 06:53:19  29.7S   69.7W Mw=4.3  EMSC   SAN JUAN, ARGENTINA          

P:  6APR2021 132798    29.0S   68.0W 4.0-5.6 BABAA  Argentina                  

P:  7APR2021 132812    31.0S   70.0W 4.0-5.8 ABAAA  Central Chile              

 

O:  9APR2021 02:02:09  33.8S   70.3W mb=4.8  EMSC   REGION METROPOLITANA, CHILE  

P:  4APR2021 132813    33.0S   71.0W 4.0-5.8 BAAAA  Central Chile              

 

AFRICA AND EUROPE

 

O:  8APR2021 15:23:06  36.4N   27.1E mb=4.2  EMSC   DODECANESE IS.-TURKEY BORDER R

P:  8APR2021 132648    37.0N   27.0E 3.0-4.6 AAAAA  Aegean Sea                 

 

No significant (M>=5) or unusual earthquakes were reported in Europe today.

 

SOUTHWEST PACIFIC

 

No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.

 

OCEAN RIDGES

 

O:  8APR2021 10:25:14  34.8S  108.0W mb=4.5  EMSC   SOUTHERN EAST PACIFIC RISE   

 

No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  8APR2021 12:19:49  28.8S  176.6W mb=4.6  EMSC   KERMADEC ISLANDS REGION      

P:  9APR2021 132801    28.0S  177.0W 4.0-5.6 AAAAA  No. Kermadec Islands       

 

O: 08APR2021 15:07:22  33.0S  179.8E ML=3.5  EMSC   SOUTH OF KERMADEC ISLANDS

O:  8APR2021 21:56:57  33.6S  179.8E ML=3.8  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  5APR2021 132822    33.0S  178.0W 4.0-5.6 BABAA  So. Kermadec Islands       

 

O: 08APR2021 22:29:05  37.8S  179.6E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O:  9APR2021 03:48:09  37.5S  179.9E ML=3.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  5APR2021 132819    38.0S  177.0E 3.0-4.6 BABAA  North Island, N.Z.         

 

O:  9APR2021 04:55:52  39.5S  174.9E ML=4.0  EMSC   NORTH ISLAND OF NEW ZEALAND  

P:  7APR2021 132824    40.0S  175.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

 

JAPAN AND KURIL ISLANDS

 

No earthquakes of M>=4 were located in Japan or the Kuril Islands today.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O:  9APR2021 01:26:09  32.7N  115.3W Ml=2.0  EMSC   SOUTHERN CALIFORNIA          

O: 08APR2021 10:49:20  32.8N  115.4W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 08APR2021 11:05:09  32.8N  115.4W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 09APR2021 03:31:45  32.8N  115.4W ML=2.5  EMSC   SOUTHERN CALIFORNIA

O: 09APR2021 03:57:12  32.8N  115.4W ML=2.6  EMSC   SOUTHERN CALIFORNIA

O: 09APR2021 04:30:57  32.8N  115.5W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

P:  4APR2021 132689    32.9N  115.6W 2.5-4.4 BAAAA  So. California             

 

NEIC reported these earthquakes of M 2.8, 2.8 in Southern California were felt with intensity II-III in the area(s) of  Southern California at Holtville and in Baja at Puebla.

 

O:  8APR2021 11:19:38  33.8N  117.0W Ml=2.8  EMSC   SOUTHERN CALIFORNIA          

O:  9APR2021 00:33:46  33.9N  116.8W ML=2.9  EMSC   SOUTHERN CALIFORNIA           

P:  8APR2021 132694    34.3N  116.5W 2.5-4.4 AAAAA  So. California             

 

NEIC reported this earthquake of M 2.8 in San  Jacinto, Southern California was felt with intensity II-III in the area(s) of San  Jacinto, Southern California in Nuevo, Hemet, Banning, Sun City, Idyllwild, and Menifee.

NEIC reported this earthquake of M 3.3 in Cabazon, Southern California was felt with intensity II-III in the area(s) of Cabazon, Southern California at White Water, Bannng, Idyllwild, Beaumont, San Jacinto, Palm Springs, Yucaipa, Calimesa.

 

O:  8APR2021 09:27:03  34.7N  120.5W Ml=2.1  EMSC   CENTRAL CALIFORNIA           

P:  8APR2021 132695    34.9N  119.0W 2.5-5.1 AABAA  So. California             

 

O:  8APR2021 20:51:13  35.6N  117.5W ML=3.3  EMSC   SOUTHERN CALIFORNIA          

P:  8APR2021 132696    35.8N  117.6W 2.5-4.9 AAAAA  So. California             

 

NEIC reported this earthquake of M 3.6 in Ridgecrest, Southern California was felt with intensity II-III in the area(s) of Ridgecrest, Southern California in Trona,Inyokern, Palmdale.

 

 

O: 08APR2021 16:59:28  38.2N  117.9W ml=2.1  EMSC   NEVADA

O:  8APR2021 14:07:41  38.2N  117.8W ml=2.5  EMSC   NEVADA                       

P:  4APR2021 132654    38.2N  118.8W 2.5-4.6 BAAAA  California/Nevada area     

 

O:  8APR2021 20:33:17  38.8N  122.8W Md=2.2  EMSC   NORTHERN CALIFORNIA          

P:  7APR2021 132662    38.7N  122.7W 2.5-4.6 AAAAA  Central California         

 

O: 09APR2021 02:06:57  40.3N  124.9W ML=2.5  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 08APR2021 21:40:53  40.4N  124.5W Md=2.5  EMSC   OFFSHORE NORTHERN CALIFORNIA

O:  9APR2021 00:39:31  40.2N  124.2W Md=2.5  EMSC   NORTHERN CALIFORNIA          

P:  7APR2021 132732    40.6N  124.9W 2.5-4.5 AAAAA  Off Coast of No. Calif     

 

O:  9APR2021 05:19:49  41.3N  116.2W ML=3.4  EMSC   NEVADA                       

P:  2APR2021 132712    40.0N  117.9W 2.5-4.8 CBBAA  California/Nevada area     

 

 

ALASKA

 

O:  8APR2021 15:02:47  52.9N  173.4W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  8APR2021 132752    51.2N  174.4W 3.5-4.9 ABAAA  Andreanoff Isls, Aleutians 

 

O:  8APR2021 17:10:18  63.2N  148.7W Mw=5.5  EMSC   CENTRAL ALASKA               

P:  4APR2021 132771    63.0N  148.6W 3.2-5.0 BAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  8APR2021 19:10:18  50.0N  115.0W Ml=2.8  EMSC   BRITISH COLUMBIA, CANADA     

P:  3APR2021 132748    52.0N  115.0W 2.0-4.3 BBAAA  Alberta                    

 

ROCKY MOUNTAINS REGION

 

O:  8APR2021 16:32:05  31.7N  104.4W ML=3.1  EMSC   WESTERN TEXAS                

P:  7APR2021 132687    32.6N  104.6W 2.0-3.9 AAAAA  SW U.S.A                   

 

O: 08APR2021 08:43:28  44.5N  115.2W ML=2.3  EMSC   SOUTHERN IDAHO

O: 08APR2021 19:16:26  45.9N  115.2W Ml=2.1  EMSC   NORTHERN IDAHO

O:  8APR2021 13:54:06  44.3N  115.2W Ml=2.1  EMSC   SOUTHERN IDAHO               

P:  6APR2021 132723    44.4N  115.1W 2.0-4.2 AAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O:  8APR2021 08:49:53  47.7N   69.9W MB=2.0  ECAN Charlevoix Seismic Zone        

P: 10APR2021 132721    47.0N   70.0W 2.0-3.9 AAAAA  Maine                      

 

O:  8APR2021 00:11:18  49.3N   90.9W MB=2.2  ECAN Atikokan, ON                   

 

O:  7APR2021 23:10:41  46.6N   76.0W MB=2.2  ECAN Maniwaki, QC                    

P:  5APR2021 132728    45.0N   75.0W 2.0-4.0 ABAAA  New York State             

 

O: 09APR2021 00:03:09  35.1N   95.3W ML=2.2  EMSC   OKLAHOMA

O: 08APR2021 18:33:40  35.2N   95.3W ML=2.8  EMSC   OKLAHOMA

O: 08APR2021 22:10:28  35.2N   95.3W ML=2.1  EMSC   OKLAHOMA

O:  8APR2021 07:17:45  34.4N   97.5W ML=2.4  EMSC   OKLAHOMA                     

P: 10APR2021 132700    35.0N   97.0W 2.0-4.3 AAAAA  Southern Plains            

 

NEIC reported this earthquake of M 2.5 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma at Kinta.

 

O:  8APR2021 17:43:33  29.2N   97.7W mb=2.7  EMSC   SOUTHERN TEXAS               

 

HAWAII

 

NEIC reported an earthquake of M 3.0 in Hawaii was felt with intensity II-III in the area(s) of Hawaii at Volcano.

 

 

 

 

 

 

 

NORTHERN KERMADEC ISLANDS REMAINS ACTIVE

 

EARTHQUAKE SUMMARY FOR  APRIL 7, 2021

 

The region of the northern Kermadec Islands remained at active seismic conditions today with several events near M 6.0 and a number of other aftershocks of M>5 of the M 8.1 of March 4, 2021 occurring today. This active was not reported felt in this remote area. As it occurred near the geomagnetic equator, it may have been enhanced by today's strong geomagnetic storm. While an M 6.0 hit in the central Kermadec Islands on April 1, 2021, today's event of M 6.0 in the strongest in the northern Kermadec Islands since immediate aftershocks of the mainshock of March 4 up to about March 6. Forecast 132801 had expected today's activity within about 100 km in the northern Kermadecs was likely around April 6.

 

O: 07APR2021 19:58:40  28.8S  176.7W mb=4.8  EMSC   KERMADEC ISLANDS REGION

O: 07APR2021 13:34:56  28.9S  176.5W mb=5.2  EMSC   KERMADEC ISLANDS REGION

O: 07APR2021 19:43:00  28.9S  176.5W Mw=5.6  EMSC   KERMADEC ISLANDS REGION

O: 07APR2021 09:53:29  29.0S  176.6W Mw=6.0  EMSC   KERMADEC ISLANDS REGION

O: 07APR2021 18:48:05  29.0S  176.7W Mw=5.8  EMSC   KERMADEC ISLANDS REGION

O: 07APR2021 10:26:51  29.1S  176.6W Mw=5.2  EMSC   KERMADEC ISLANDS REGION

O: 07APR2021 13:15:37  29.1S  176.7W Mw=5.1  EMSC   KERMADEC ISLANDS REGION

O: 08APR2021 01:00:39  29.1S  176.4W mb=5.4  EMSC   KERMADEC ISLANDS REGION

O:  7APR2021 10:42:05  28.8S  176.7W Mw=5.4  EMSC   KERMADEC ISLANDS REGION      

P:  6APR2021 132801    28.0S  176.0W 4.0-5.6 AAAAA  No. Kermadec Islands       

 

An unusual earthquake of M 4.5 in the Caribbean Sea north of Colombia occurred today. NEIC reported this earthquake of M 4.5 north of Colombia  was felt with intensity II-III in the area(s) of Providencia, Colombia. The last earthquake within about 200 km of this epicenter with larger magnitude than today's M 4.5 occurred as an M 6.0 and aftershocks on November 25, 2018. Today's event is probably an aftershock of that event.  Forecast 132603 had expected today's activity to the southwest around April 5. This epicenter is at 102 degrees from  the M 8.1 in the Kermadec Islands and was probably promoted by energy from  that source.

 

O:  7APR2021 10:46:01  13.1N   81.3W mb=4.5  EMSC   CARIBBEAN SEA                

P:  5APR2021 132603    10.0N   84.0W 3.5-5.5 ACCAA  Caribbean Sea              

 

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the western Fox Islands, Aleutians, Alaska. It was not reported felt in this remote area. This is the strongest earthquake in the Fox Islands in the past four months - since an M 6.4 on December 1, 2020 about 50 km to the east of today's epicenter. Forecast 132755 had expected today's event was likely in this area of the Fox Islands around April 4. Seismicity in Alaska has been quiet in recent weeks and today's event may preceded enhanced regional seismicity associated with the strong geomagnetic storm at high latitudes which reached maximum near this time. This summary had noted this geomagnetic storm as:

 

 

"The geomagnetic field saw active today. The AP level was 17.  High latitude geomagnetic field  saw stormy conditions with AP 35. Strong geomagnetic storms such as this can promote enhanced seismicity in the high latitudes and near the geomagnetic equator and this is likely in the next three days." (April 7-8, 2021)

 

O:  7APR2021 19:31:58  52.6N  169.2W mb=4.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  4APR2021 132755    53.7N  167.0W 3.5-5.2 BBBAA  Fox Islands, Aleutians     

 

A series of earthquakes of M>=3 occurred today in the western U.S. This was

a considerable enhancement of regional seismicity associated with today's geomagnetic storm. It included events in Hawaii (M 3.0, 3.0); Arizona (M 3.3); Idaho (M 3.2); northern Utah (M 3.0); off the coast of Oregon (M 3.1);

Northern Nevada (M 3.2);  Central California (M 3.3); southern California (M 3.6); Oklahoma (M 3.8);  Baja/Southern California (M 3.5). Most of this activity was lightly felt near the epicenter and had been expected in early April in the forecasts of this summary. The most active of these was the region of Southern California near the Baja California border where a series of light earthquakes accompanied the M 3.5.  NEIC reported these earthquakes of M 3.5 and 3.7 in  Southern California near the Baja border was felt with intensity II-III in the area(s) of  Southern California near the Baja border in Heber (IV), Holtville, Calexico, Mexicali, El Centro, Imperial, Brawley, and Palm Springs.  Forecast 132689 had expected this activity was likely within about 15 km in early April. 

 

O: 08APR2021 02:00:40  32.8N  115.5W Ml=2.4  EMSC   SOUTHERN CALIFORNIA

O: 08APR2021 02:08:32  32.8N  115.5W ML=2.6  EMSC   SOUTHERN CALIFORNIA

O: 08APR2021 02:41:51  32.8N  115.4W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 08APR2021 03:28:50  32.8N  115.5W ML=2.8  EMSC   SOUTHERN CALIFORNIA

O: 08APR2021 03:38:12  32.8N  115.4W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 08APR2021 03:52:07  32.8N  115.5W ML=3.5  EMSC   SOUTHERN CALIFORNIA

O: 08APR2021 04:12:54  32.8N  115.5W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O:  8APR2021 03:57:46  32.7N  115.4W ML=2.5  EMSC   SOUTHERN CALIFORNIA          

P:  4APR2021 132689    32.9N  115.6W 2.5-4.4 BAAAA  So. California             

 

O:  8APR2021 03:02:54  19.3N  155.5W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII      

O:  8APR2021 05:47:27  20.5N  156.0W ML=3.0  EMSC   MAUI REGION, HAWAII          

P:  7APR2021 132633    20.1N  156.1W 4.0-5.7 AAAAA  Hawaii area                

 

O:  7APR2021 09:20:59  35.2N  111.6W ML=3.3  EMSC   ARIZONA                      

P:  4APR2021 132705    37.0N  111.8W 2.0-3.9 BBAAA  Utah area                  

 

NEIC reported this earthquake of M 3.3 in Arizona was felt with intensity II-III in the area(s) of Arizona at Flagstaff, Prescott, Phoenix (IV), Peoria, Apache Junction, and Yuma.

 

O:  8APR2021 05:45:29  37.8N  113.0W ML=3.0  EMSC   UTAH                         

P:  6APR2021 132705    37.7N  113.9W 2.0-4.0 AAAAA  Utah area                  

 

NEIC reported this earthquake of M 3.0 in Utah was felt with intensity II-III in the area(s) of Utah in Brian Head and Cedar City.

 

O: 07APR2021 17:07:33  44.4N  115.2W Ml=3.2  EMSC   SOUTHERN IDAHO

P:  6APR2021 132723    44.4N  115.1W 2.0-4.2 AAAAA  Montana/Idaho              

 

O:  7APR2021 09:40:05  44.2N  129.3W ML=3.1  EMSC   OFF COAST OF OREGON          

P:  6APR2021 132733    44.5N  129.8W 3.0-4.7 AAAAA  Off Coast of Oregon        

 

O:  7APR2021 13:17:30  40.9N  117.2W ml=3.2  EMSC   NEVADA                       

P:  2APR2021 132712    40.0N  117.9W 2.5-4.8 BAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 3.2 in Northern Nevada was felt with intensity II-III in the area(s) of Northern Nevada at Golconda.

 

O:  7APR2021 20:18:17  36.7N  120.7W ML=3.3  EMSC   CENTRAL CALIFORNIA           

P:  6APR2021 132658    36.2N  120.8W 2.5-4.9 AAAAA  Central California         

 

O:  7APR2021 13:42:05  35.6N  117.4W Ml=3.6  EMSC   SOUTHERN CALIFORNIA          

P:  8APR2021 132696    35.8N  117.6W 2.5-4.9 AAAAA  So. California             

 

NEIC reported this earthquake of M 3.6 in Southern California was felt with intensity II-III in the area(s) of Southern California at Trona (IV), Ridgecrest, Inyokern, Bodfish, Simi Valley.

 

O:  7APR2021 16:51:49  35.1N   96.3W ML=3.8  EMSC   OKLAHOMA                     

P:  6APR2021 132700    36.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

NEIC reported this earthquake of M 3.2-3.8 in Oklahoma was felt with intensity IV-V   in the area(s) of Oklahoma at Union City, Minco, and II-III in Mustang, Tuttle, El Reno, Norman and Oklahoma City.

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O:  7APR2021 13:19:36  23.8N  121.5E ML=4.9  EMSC   TAIWAN                       

O:  7APR2021 13:19:36  23.8N  121.5E ML=4.9  TAI    Hualien, Taiwan              

P:  9APR2021 132644    23.0N  121.0E 4.0-5.6 AAAAA  Taiwan                     

 

GUC reported this event was felt with intensity IV in Hualien; III in Taitung and Nantou; II in Yilan, Changhua, Yunlin and I in Taipei, Chiayi, Miaoli and Tainan, Counties, Taiwan.

 

O:  7APR2021 16:28:44  24.4N  122.0E ML=4.3  TAI    Hualien, Taiwan              

O:  8APR2021 00:26:21  24.7N  122.0E ML=4.5  TAI    Hualien, Taiwan              

P:  5APR2021 132644    23.0N  122.0E 4.0-5.4 AAAAA  Taiwan                     

 

CWB reported the M  4.5 was felt with intensity II in Yilan and Hsinchu County, and I in Taipei, Tayuan, Hualien, Nantou, Miaoli Counties, Taiwan.

The M 4.3 was felt with intensity II in Yilan, and I in Hualien, Taipei, Nantou and Taipei Counties.

 

O:  8APR2021 04:17:21  54.7N  163.2E mb=4.3  EMSC   OFF EAST COAST OF KAMCHATKA  

P:  5APR2021 132754    54.0N  162.0E 4.0-5.8 BAAAA  E. of Kamchatka            

 

No significant (M>=5) or unusual earthquakes were reported in Asia today.

 

INDONESIA AND PHILIPPINES

 

O:  7APR2021 15:50:18   0.6N   98.4E mb=4.2  EMSC   NIAS REGION, INDONESIA       

P:  9APR2021 132577     0.0N   99.0E 4.0-5.4 AAAAA  So. Sumatera               

 

O:  7APR2021 12:47:07   1.3N  121.8E ML=4.2  EMSC   MINAHASA, SULAWESI, INDONESIA

O:  8APR2021 05:26:53   2.9N  122.5E Mw=5.0  EMSC   CELEBES SEA                  

P:  9APR2021 132574     1.0N  124.0E 4.0-5.6 AABAA  Mindanao, Philippines      

 

O:  8APR2021 02:26:31   3.2N  126.7E ML=4.2  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  8APR2021 132572     4.0N  128.0E 4.0-5.6 AABAA  Halmahera                  

 

O:  8APR2021 00:57:57   3.8N  128.5E ML=4.5  EMSC   NORTH OF HALMAHERA, INDONESIA

P:  8APR2021 132572     4.0N  128.0E 4.0-5.6 AAAAA  Halmahera                  

 

O:  7APR2021 11:50:16   5.7S  127.8E ML=4.5  EMSC   BANDA SEA                    

P:  5APR2021 132580     6.0S  128.0E 4.0-5.4 AAAAA  Banda Sea                  

 

O:  8APR2021 01:49:03   6.6S  104.6E ML=4.6  EMSC   SUNDA STRAIT, INDONESIA      

P:  9APR2021 132592     7.0S  105.0E 4.0-5.5 AAAAA  So. of Java                

 

O:  7APR2021 23:50:34   6.7S  129.8E mb=4.6  EMSC   BANDA SEA                    

P:  9APR2021 132600     5.0S  130.0E 4.0-5.5 ABAAA  West Irian, PNG            

 

CENTRAL AND SOUTH AMERICA

 

O:  7APR2021 17:51:30   9.3N   83.8W ML=4.3  EMSC   COSTA RICA                   

P:  5APR2021 132603    10.0N   84.0W 3.5-5.5 AAAAA  Caribbean Sea              

 

O:  7APR2021 21:18:38  10.8S   78.0W mb=4.2  EMSC   NEAR COAST OF CENTRAL PERU   

P:  4APR2021 132589     9.0S   81.0W 4.0-5.8 BBCAA  No. Peru                   

 

O:  7APR2021 10:46:01  13.1N   81.3W mb=4.5  EMSC   CARIBBEAN SEA                

P:  5APR2021 132603    10.0N   84.0W 3.5-5.5 ACCAA  Caribbean Sea              

 

O:  8APR2021 06:24:53  15.6N   93.5W ML=4.1  EMSC   OFFSHORE CHIAPAS, MEXICO     

P:  8APR2021 132605    16.0N   93.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O:  7APR2021 19:33:14  16.2S   70.4W ML=4.0  EMSC   SOUTHERN PERU                

P:  3APR2021 132792    16.0S   71.0W 4.0-5.7 BAAAA  So. Peru/Bolivia           

 

O:  7APR2021 18:51:58  16.2N   95.6W ML=4.1  EMSC   OAXACA, MEXICO                

O:  7APR2021 10:30:26  16.4N   95.1W ML=4.0  EMSC   OAXACA, MEXICO               

O: 08APR2021 04:26:08  17.6N   94.7W ML=4.2  EMSC   VERACRUZ, MEXICO

O:  7APR2021 15:49:14  17.6N   94.4W mb=4.3  EMSC   VERACRUZ, MEXICO             

P:  5APR2021 132605    17.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O:  8APR2021 01:19:41  19.3N  100.4W mb=4.6  EMSC   MICHOACAN, MEXICO            

P:  5APR2021 132621    19.0N   99.0W 3.5-5.3 BAAAA  Oaxaca, Mexico             

 

O:  7APR2021 21:28:20  23.2S   67.1W ML=4.2  EMSC   JUJUY, ARGENTINA             

O:  7APR2021 08:12:34  24.1S   66.9W mb=4.1  EMSC   SALTA, ARGENTINA             

P:  5APR2021 132797    24.0S   68.0W 4.0-5.8 AAAAA  Argentina                  

 

O:  7APR2021 23:14:26  36.4S   70.9W mb=4.6  EMSC   MAULE, CHILE                 

P:  5APR2021 132814    36.0S   71.0W 4.0-5.7 AAAAA  Central Chile              

 

NEIC reported this earthquake of M 4.6 in Maule, Chile was felt with intensity II-III in the area(s) of Maule, Chile at Vina del Mar.

 

 

AFRICA AND EUROPE

 

O:  7APR2021 23:06:18  12.8S   45.7E ML=3.3  EMSC   MAYOTTE REGION               

P:  4APR2021 132787    12.0S   45.0E 3.0-4.6 BAAAA  Madagascar area            

 

O:  8APR2021 00:21:48  28.6N   15.1W ML=2.1  EMSC   CANARY ISLANDS, SPAIN REGION 

P:  9APR2021 132630    28.0N   16.0W 3.0-4.4 AAAAA  Canary Islands             

 

O: 07APR2021 21:54:56  36.5N   27.2E mb=4.0  EMSC   DODECANESE IS.-TURKEY BORDER REG

O: 07APR2021 22:35:05  36.5N   27.1E mb=4.0  EMSC   DODECANESE IS.-TURKEY BORDER REG

O:  8APR2021 00:33:47  36.5N   27.2E mb=4.5  EMSC   DODECANESE IS.-TURKEY BORDER R

P:  8APR2021 132648    37.0N   27.0E 3.0-4.6 AAAAA  Aegean Sea                 

 

NEIC reported this earthquake of M 4.5 in the Dodecanese Islands, Greece was felt with intensity II-III in the area(s) of the Dodecanese Islands, Greece at Kardamaina and Drosia, Greece and in Datca, Turkey. 

 

SOUTHWEST PACIFIC

 

O:  8APR2021 01:13:47  18.5S  169.4E mb=5.1  EMSC   VANUATU                      

P:  3APR2021 132796    17.0S  168.0E 4.0-5.5 BBBAA  Vanuatu Islands            

 

OCEAN RIDGES

 

No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 07APR2021 19:58:40  28.8S  176.7W mb=4.8  EMSC   KERMADEC ISLANDS REGION

O: 07APR2021 13:34:56  28.9S  176.5W mb=5.2  EMSC   KERMADEC ISLANDS REGION

O: 07APR2021 19:43:00  28.9S  176.5W Mw=5.6  EMSC   KERMADEC ISLANDS REGION

O: 07APR2021 09:53:29  29.0S  176.6W Mw=6.0  EMSC   KERMADEC ISLANDS REGION

O: 07APR2021 18:48:05  29.0S  176.7W Mw=5.8  EMSC   KERMADEC ISLANDS REGION

O: 07APR2021 10:26:51  29.1S  176.6W Mw=5.2  EMSC   KERMADEC ISLANDS REGION

O: 07APR2021 13:15:37  29.1S  176.7W Mw=5.1  EMSC   KERMADEC ISLANDS REGION

O: 08APR2021 01:00:39  29.1S  176.4W mb=5.4  EMSC   KERMADEC ISLANDS REGION

O:  7APR2021 10:42:05  28.8S  176.7W Mw=5.4  EMSC   KERMADEC ISLANDS REGION      

P:  6APR2021 132801    28.0S  176.0W 4.0-5.6 AAAAA  No. Kermadec Islands       

 

O:  7APR2021 17:14:29  35.0S  179.1E ML=3.8  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  5APR2021 132819    38.0S  177.0E 3.0-4.6 ACBAA  North Island, N.Z.         

 

O:  7APR2021 15:07:34  44.9S  167.4E ML=4.0  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 07APR2021 15:07:34  44.8S  167.2E MS=4.1  GEONET Felt with weak to light intensity

P:  4APR2021 132827    45.0S  167.0E 3.0-5.1 BAAAA  So. Island, N.Z.           

 

GEONET reported this earthquake was felt with weak to light intensity in the area of Southern South Island, New Zealand. 4 felt reports were published including 3 of weak and 1 of light shaking and 0 of moderate intensity.

 

JAPAN AND KURIL ISLANDS

 

O:  7APR2021 19:24:31  24.8N  128.1E mb=4.2  EMSC   SOUTHEAST OF RYUKYU ISLANDS  

P:  8APR2021 132641    25.0N  127.0E 4.0-5.5 AAAAA  Ryukyu Islands             

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 08APR2021 02:00:40  32.8N  115.5W Ml=2.4  EMSC   SOUTHERN CALIFORNIA

O: 08APR2021 02:08:32  32.8N  115.5W ML=2.6  EMSC   SOUTHERN CALIFORNIA

O: 08APR2021 02:41:51  32.8N  115.4W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 08APR2021 03:28:50  32.8N  115.5W ML=2.8  EMSC   SOUTHERN CALIFORNIA

O: 08APR2021 03:38:12  32.8N  115.4W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 08APR2021 03:52:07  32.8N  115.5W ML=3.5  EMSC   SOUTHERN CALIFORNIA

O: 08APR2021 04:12:54  32.8N  115.5W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O:  8APR2021 03:57:46  32.7N  115.4W ML=2.5  EMSC   SOUTHERN CALIFORNIA          

P:  4APR2021 132689    32.9N  115.6W 2.5-4.4 BAAAA  So. California             

 

O:  8APR2021 05:48:10  34.2N  117.3W Ml=2.1  EMSC   GREATER LOS ANGELES AREA, CALI

P:  8APR2021 132694    34.3N  116.5W 2.5-4.4 AAAAA  So. California             

 

O:  7APR2021 19:36:32  34.5N  119.1W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P:  8APR2021 132695    34.9N  119.0W 2.5-5.1 AAAAA  So. California             

 

 

O: 07APR2021 20:41:59  35.1N  117.0W Ml=2.8  EMSC   SOUTHERN CALIFORNIA

O:  7APR2021 18:20:03  35.1N  117.0W Ml=2.3  EMSC   SOUTHERN CALIFORNIA          

P:  7APR2021 132696    35.0N  117.7W 2.5-4.8 AAAAA  So. California             

 

NEIC reported this earthquake of M 2.8 in Southern California was felt with intensity II-III in the area(s) of Southern California at Barstow.

 

O:  7APR2021 13:42:05  35.6N  117.4W Ml=3.6  EMSC   SOUTHERN CALIFORNIA          

P:  8APR2021 132696    35.8N  117.6W 2.5-4.9 AAAAA  So. California             

 

O:  7APR2021 08:02:16  36.0N  117.8W Ml=2.3  EMSC   CENTRAL CALIFORNIA           

P:  8APR2021 132696    35.8N  117.6W 2.5-4.9 AAAAA  So. California             

 

O:  8APR2021 01:03:00  36.6N  121.1W Md=2.5  EMSC   CENTRAL CALIFORNIA           

O:  7APR2021 20:18:17  36.7N  120.7W ML=3.3  EMSC   CENTRAL CALIFORNIA           

P:  6APR2021 132658    36.2N  120.8W 2.5-4.9 AAAAA  Central California         

 

NEIC reported the earthquake of M 2.5 in Central California was felt with intensity II-III in the area(s) of Central California at Los Banos.

NEIC reported the earthquake of M 3.3 in Central California was felt with intensity II-III in the area(s) of Central California in Firebaugh, Dos Palos and Los Banos.

 

O:  7APR2021 13:45:36  38.0N  122.1W Md=2.5  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P:  3APR2021 132661    37.9N  122.0W 2.5-4.5 BAAAA  Central California         

 

NEIC reported this earthquake of M 2.5 in San Francisco, California was felt with intensity II-III in the area(s) of San Francisco, California at Pleasant Hill, Walnut Creek, Lafayette, Martinez, Concord, Alamo and Moraga.

 

O:  7APR2021 18:10:30  38.1N  117.9W ml=2.0  EMSC   NEVADA                       

P:  4APR2021 132654    38.2N  118.8W 2.5-4.6 BAAAA  California/Nevada area     

 

O:  8APR2021 06:38:57  38.2N  117.9W ML=2.5  EMSC   NEVADA                       

P:  8APR2021 132652    37.5N  118.6W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 07APR2021 12:13:43  38.8N  122.8W Md=2.5  EMSC   NORTHERN CALIFORNIA

O: 07APR2021 12:56:14  38.8N  122.8W ML=2.5  EMSC   NORTHERN CALIFORNIA

O:  7APR2021 15:17:18  38.5N  122.6W Md=2.5  EMSC   NORTHERN CALIFORNIA          

P:  7APR2021 132662    38.7N  122.7W 2.5-4.6 AAAAA  Central California         

 

NEIC reported the earthquake of M 2.9 in the Geysers, California  was felt with intensity II-III in the area(s) of  the Geysers, California at Kelseyville, Middletown, and Calistoga.

NEIC reported the earthquake of M 2.5 in the Geysers, California was felt with intensity II-III in the area(s) of the Geysers, California at Santa Rosa, Calistoga, Sonoma.

 

O:  7APR2021 07:02:13  40.6N  119.5W ml=2.2  EMSC   NEVADA                       

P:  5APR2021 132712    40.2N  119.6W 2.5-4.6 AAAAA  California/Nevada area     

 

O:  7APR2021 13:17:30  40.9N  117.2W ml=3.2  EMSC   NEVADA                       

P:  2APR2021 132712    40.0N  117.9W 2.5-4.8 BAAAA  California/Nevada area     

 

O:  7APR2021 14:24:28  41.2N  122.1W Md=2.0  EMSC   NORTHERN CALIFORNIA          

P:  4APR2021 132731    40.6N  122.4W 2.5-4.6 BAAAA  Northern California        

 

 

ALASKA

 

O:  7APR2021 19:31:58  52.6N  169.2W mb=4.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  4APR2021 132755    53.7N  167.0W 3.5-5.2 BBBAA  Fox Islands, Aleutians     

 

O:  7APR2021 09:56:50  59.6N  152.8W ML=3.0  EMSC   SOUTHERN ALASKA              

P:  5APR2021 132770    60.3N  153.0W 3.2-5.0 AAAAA  Central Alaska             

 

O:  7APR2021 11:46:24  63.3N  150.5W ML=3.0  EMSC   CENTRAL ALASKA               

P:  7APR2021 132770    63.2N  151.4W 3.2-5.1 AAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  7APR2021 09:40:05  44.2N  129.3W ML=3.1  EMSC   OFF COAST OF OREGON          

P:  6APR2021 132733    44.5N  129.8W 3.0-4.7 AAAAA  Off Coast of Oregon        

 

ROCKY MOUNTAINS REGION

 

O:  7APR2021 09:20:59  35.2N  111.6W ML=3.3  EMSC   ARIZONA                      

P:  4APR2021 132705    37.0N  111.8W 2.0-3.9 BBAAA  Utah area                   

 

O:  7APR2021 11:09:13  37.0N  105.0W ML=2.7  EMSC   COLORADO                     

P:  5APR2021 132665    36.9N  105.1W 2.0-4.1 AAAAA  Colorado area              

 

O:  8APR2021 05:45:29  37.8N  113.0W ML=3.0  EMSC   UTAH                         

P:  6APR2021 132705    37.7N  113.9W 2.0-4.0 AAAAA  Utah area                  

 

O: 07APR2021 17:07:33  44.4N  115.2W Ml=3.2  EMSC   SOUTHERN IDAHO

O: 07APR2021 14:24:23  44.6N  114.7W Ml=2.1  EMSC   SOUTHERN IDAHO

O:  7APR2021 12:32:22  44.3N  115.2W Ml=2.8  EMSC   SOUTHERN IDAHO               

P:  6APR2021 132723    44.4N  115.1W 2.0-4.2 AAAAA  Montana/Idaho              

 

O:  7APR2021 10:35:03  45.1N  111.8W Ml=2.5  EMSC   WESTERN MONTANA              

P:  9APR2021 132746    45.6N  111.9W 2.0-4.3 AAAAA  Yellowstone/Wyoming        

 

 

EASTERN U.S./CANADA

 

O:  7APR2021 16:51:49  35.1N   96.3W ML=3.8  EMSC   OKLAHOMA                     

O:  7APR2021 12:29:13  35.2N   95.3W ML=2.2  EMSC   OKLAHOMA                     

P:  6APR2021 132700    36.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

O:  7APR2021 12:29:13  35.2N   95.3W ML=2.2  EMSC   OKLAHOMA                     

P:  8APR2021 132699    34.0N   96.0W 2.0-4.0 ABAAA  Southern Plains            

 

O:  7APR2021 09:08:01  46.9N   77.6W MB=1.8  ECAN Deep River, ON                 

P:  5APR2021 132728    45.0N   75.0W 2.0-4.0 AABAA  New York State             

 

O: 07APR2021 05:46:13  46.9N   76.5W MB=1.9  ECAN Maniwaki, QC    

O:  6APR2021 23:24:11  46.3N   75.9W MB=1.8  ECAN Maniwaki, QC                    

P:  5APR2021 132728    45.0N   75.0W 2.0-4.0 ABAAA  New York State             

 

O: 07APR2021 07:43:02  50.1N   60.8W MB=2.2  ECAN La Romaine, QC   

O:  7APR2021 01:36:34  50.1N   60.8W MB=2.2  ECAN La Romaine, QC                 

P:  4APR2021 132715    49.0N   66.0W 2.0-4.0 BBCAA  E. of Maine                

 

O:  6APR2021 08:13:46  49.1N   66.9W MB=2.0  ECAN Cap-Chat, QC                   

P:  4APR2021 132715    49.0N   66.0W 2.0-4.0 AAAAA  E. of Maine                

 

O: 06APR2021 07:59:02  47.4N   70.5W MB=1.0  ECAN Charlevoix Seismic Zone     

O:  6APR2021 08:29:24  47.7N   69.9W MB=1.6  ECAN Charlevoix Seismic Zone        

P:  3APR2021 132721    47.0N   69.0W 2.0-3.9 BAAAA  Maine                      

 

HAWAII

 

O:  8APR2021 03:02:54  19.3N  155.5W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

P:  9APR2021 132610    19.9N  156.1W 3.0-4.7 AAAAA  Hawaii                     

 

O:  8APR2021 05:47:27  20.5N  156.0W ML=3.0  EMSC   MAUI REGION, HAWAII          

P:  7APR2021 132633    20.1N  156.1W 4.0-5.7 AAAAA  Hawaii area                

 

MODERATELY STRONG QUAKE IN NEW IRELAND, P.N.G.

 

EARTHQUAKE SUMMARY FOR  APRIL 6, 2021

 

The strongest earthquake in the world today was an M 5.6 in New Ireland, Papua New Guinea. It was probably lightly felt in the New Ireland area. This is the strongest earthquake in the area of New Ireland within about 200 km of this epicenter since an M 6.1 on May 7, 2020.  Forecast 132587 had expected today's event in this area was likely around April 6.

 

O:  7APR2021 05:13:16   3.6S  153.9E Mw=5.6  EMSC   NEW IRELAND REGION, P.N.G.   

P:  6APR2021 132587     5.0S  153.0E 4.0-5.5 ABAAA  New Britain                

 

A series of aftershocks of M 5.3 each occurred today in the northern Kermadec Islands, New Zealand. This area had been declining in seismicity over the past several days and today's activity may be related to the M 6.0 north of North Island, New Zealand which occurred yesterday. An M 6.5 hit the area on April 1, 2021, the first of M>=5.3 in the area since March 15, 2021. Today's activity was not reported felt in this remote area. Forecast 132802 had expected today's activity within about 50 km was likely around April 5.

 

O: 06APR2021 07:37:22  29.0S  176.7W mb=5.3  EMSC   KERMADEC ISLANDS REGION

O: 06APR2021 08:16:14  29.5S  176.8W mb=5.3  EMSC   KERMADEC ISLANDS REGION

O:  6APR2021 10:07:46  29.7S  176.6W mb=5.3  EMSC   KERMADEC ISLANDS REGION      

P:  5APR2021 132802    29.0S  176.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the central Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. This is the strongest earthquake within  about 150 km of this epicenter since an M 5.0 on December 16, 2020 when an M 5.0 occurred north west of today's epicenter. Forecast 132749 had expected today's event in this area was likely around April 4, 2021. This event is near the antipode of the M 6.6 of April 3 in the South Atlantic Ocean and may have been promoted by energy from that source.

 

O:  6APR2021 09:02:13  50.8N  177.3W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  4APR2021 132749    51.6N  177.6W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O:  6APR2021 09:01:19  27.0N   89.3E ML=3.9  EMSC   INDIA-BANGLADESH BORDER REGION

P:  8APR2021 132638    27.0N   88.0E 3.5-5.4 AAAAA  Nepal                      

 

O:  6APR2021 21:48:35  32.0N   93.1E Mw=5.0  EMSC   EASTERN XIZANG               

P: 29MAR2021 132436    33.0N   92.0E 3.8-5.2 CAAAA  Xizang                     

 

O:  6APR2021 17:22:17  35.2N   59.3E mb=4.4  EMSC   NORTHEASTERN IRAN            

P:  1APR2021 132649    33.0N   60.0E 3.8-5.4 BCAAA  Afghanistan                

 

O:  6APR2021 15:12:25  35.5N   46.2E Mw=5.3  EMSC   IRAN-IRAQ BORDER REGION      

P:  4APR2021 132679    36.0N   46.0E 3.8-5.5 AAAAA  No. Iran                   

 

NEIC reported this earthquake of M 5.3 in Iraq was felt with intensity II-III in the area(s) of  Baynjiway, Iraq.

 

O:  6APR2021 15:39:18  47.9N  145.9E mb=4.1  EMSC   SEA OF OKHOTSK               

P:  7APR2021 132716    42.0N  145.0E 3.5-5.5 ACAAA  Hokkaido, Japan             

 

O: 06APR2021 21:55:47  32.0N   93.1E mb=4.8  EMSC   EASTERN XIZANG

O: 06APR2021 22:01:09  32.1N   93.1E mb=4.1  EMSC   XIZANG-QINGHAI BORDER REGION

 

INDONESIA AND PHILIPPINES

 

O:  6APR2021 21:44:21   0.1S  124.4E ML=4.3  EMSC   MOLUCCA SEA                   

P:  7APR2021 132595     1.0S  122.0E 4.0-5.6 AACAA  Sulawesi area              

P:  9APR2021 132574     1.0N  124.0E 4.0-5.6 BBAAA  Mindanao, Philippines      

 

O:  6APR2021 17:40:19   3.6S  138.7E mb=4.6  EMSC   PAPUA, INDONESIA             

P:  9APR2021 132598     2.0S  139.0E 4.0-5.5 BBAAA  West Irian, PNG            

 

O:  6APR2021 20:08:48   5.9N  126.5E mb=5.1  EMSC   MINDANAO, PHILIPPINES        

P:  9APR2021 132573     6.0N  127.0E 4.0-5.8 BAAAA  Halmahera                  

 

O:  6APR2021 20:17:30   6.3S  130.2E ML=4.6  EMSC   BANDA SEA                    

P:  5APR2021 132600     6.0S  131.0E 4.0-5.4 AAAAA  West Irian, PNG            

 

O:  6APR2021 07:00:54   9.4S  107.1E ML=4.2  EMSC   SOUTH OF JAVA, INDONESIA     

P:  6APR2021 132793    10.0S  107.0E 4.0-5.4 AAAAA  So. of Java                

 

O:  6APR2021 08:23:11  13.1N  143.4E mb=4.6  EMSC   GUAM REGION                  

P:  9APR2021 132624    12.0N  143.0E 4.0-5.6 BBAAA  So. Marianas/Guam          

 

 

CENTRAL AND SOUTH AMERICA

 

 

O:  6APR2021 19:36:16   5.7S   80.7W mb=4.8  EMSC   NEAR COAST OF NORTHERN PERU  

P:  9APR2021 132583     4.0S   80.0W 4.0-5.5 BBAAA  Ecuador                    

P: 10APR2021 132589     6.0S   79.0W 4.0-5.4 BABAA  No. Peru                   

 

O:  6APR2021 18:01:14   3.6N   83.1W mb=4.7  EMSC   OFF COAST OF CENTRAL AMERICA 

P:  1APR2021 132571     4.0N   83.0W 4.0-5.8 BAAAA  Ecuador                    

P:  4APR2021 132570     5.0N   83.0W 3.5-5.3 ABAAA  Costa Rica                 

 

O:  6APR2021 21:33:23  12.2N   87.3W mb=4.2  EMSC   NEAR COAST OF NICARAGUA      

P:  7APR2021 132617    13.0N   87.0W 3.5-5.8 AAAAA  Nicaragua                  

 

O:  6APR2021 08:09:35  15.2N   94.6W ML=4.0  EMSC   OFF COAST OF OAXACA, MEXICO  

P:  8APR2021 132605    16.0N   93.0W 3.5-5.3 ABBAA  Chiapas, Mexico            

P:  9APR2021 132604    14.0N   94.0W 3.5-5.3 BBAAA  Chiapas, Mexico            

 

O:  6APR2021 18:43:58  15.5N   95.5W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO      

P:  6APR2021 132620    15.0N   96.0W 3.5-5.2 AAAAA  Oaxaca, Mexico             

 

O:  6APR2021 15:28:30  17.2N   95.8W ML=4.0  EMSC   OAXACA, MEXICO               

P:  5APR2021 132605    17.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O:  6APR2021 18:53:27  19.5N   70.1W ML=3.0  EMSC   DOMINICAN REPUBLIC           

P:  4APR2021 132628    20.0N   71.0W 3.0-4.6 AAAAA  Bahamas/No. Caribbean      

 

O: 06APR2021 09:26:39  24.1S   67.0W mb=4.4  EMSC   SALTA, ARGENTINA

O:  7APR2021 02:30:28  23.3S   66.8W Mw=4.2  EMSC   JUJUY, ARGENTINA             

P:  5APR2021 132797    24.0S   68.0W 4.0-5.8 AAAAA  Argentina                  

 

O:  7APR2021 02:25:43  31.0S   71.8W mb=4.2  EMSC   OFFSHORE COQUIMBO, CHILE     

P:  5APR2021 132813    32.0S   71.0W 4.0-5.9 AAAAA  Central Chile               

 

O:  6APR2021 17:36:25  24.1S   64.3W ML=4.5  EMSC   JUJUY, ARGENTINA             

P:  9APR2021 132798    27.0S   63.0W 4.0-5.8 BCAAA  Argentina                  

 

AFRICA AND EUROPE

 

O:  7APR2021 02:06:07  41.5N   19.4E mb=4.1  EMSC   ADRIATIC SEA                  

P:  9APR2021 132709    43.0N   18.0E 3.0-4.9 ABAAA  Adriatic Sea               

 

O:  6APR2021 08:54:20  45.2N   16.2E mb=4.6  EMSC   CROATIA                      

P:  5APR2021 132717    45.0N   16.0E 3.0-5.1 AAAAA  Italy                       

 

No significant (M>=5) or unusual earthquakes were reported in Europe today.

 

SOUTHWEST PACIFIC

 

O:  7APR2021 05:13:16   3.6S  153.9E Mw=5.6  EMSC   NEW IRELAND REGION, P.N.G.   

P:  6APR2021 132587     5.0S  153.0E 4.0-5.5 ABAAA  New Britain                 

 

OCEAN RIDGES

 

No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  6APR2021 12:40:26  29.6S  178.4W mb=4.8  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  5APR2021 132821    31.0S  178.0W 4.0-5.6 ABAAA  So. Kermadec Islands       

P:  9APR2021 132819    30.0S  178.0W 4.0-5.6 BAAAA  No. Kermadec Islands       

 

O: 06APR2021 07:37:22  29.0S  176.7W mb=5.3  EMSC   KERMADEC ISLANDS REGION

O: 06APR2021 08:16:14  29.5S  176.8W mb=5.3  EMSC   KERMADEC ISLANDS REGION

O:  6APR2021 10:07:46  29.7S  176.6W mb=5.3  EMSC   KERMADEC ISLANDS REGION      

P:  5APR2021 132802    29.0S  176.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

O:  6APR2021 14:19:16  37.4S  179.9E ML=3.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  5APR2021 132819    38.0S  177.0E 3.0-4.6 AABAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

O:  6APR2021 12:20:30  37.4N  141.6E ML=3.5  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  7APR2021 132683    38.0N  140.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

 

O:  6APR2021 20:10:36  38.2N  142.2E mb=4.2  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  7APR2021 132683    38.0N  140.0E 4.0-5.6 AABAA  Off East Coast Honshu      

 

O:  6APR2021 16:44:15  43.1N  145.6E mb=4.6  EMSC   HOKKAIDO, JAPAN REGION       

P:  7APR2021 132716    42.0N  145.0E 3.5-5.5 ABAAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O:  7APR2021 01:57:49  33.1N  115.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P:  4APR2021 132689    32.9N  115.6W 2.5-4.4 BAAAA  So. California             

 

O:  7APR2021 06:46:08  33.9N  116.7W Ml=2.1  EMSC   SOUTHERN CALIFORNIA          

P:  6APR2021 132690    33.4N  116.7W 2.5-4.5 AAAAA  So. California             

 

O:  6APR2021 20:05:31  34.0N  118.3W Ml=2.3  EMSC   GREATER LOS ANGELES AREA, CALI

P:  4APR2021 132693    34.0N  118.7W 2.5-4.8 AAAAA  So. California             

P:  7APR2021 132693    34.4N  118.6W 2.5-4.9 AAAAA  So. California             

 

O:  6APR2021 22:39:33  36.5N  121.1W Md=2.0  EMSC   CENTRAL CALIFORNIA           

P:  6APR2021 132658    36.2N  120.8W 2.5-4.9 AAAAA  Central California         

 

O:  6APR2021 08:24:13  37.2N  114.6W ML=2.9  EMSC   NEVADA                       

P:  6APR2021 132705    37.7N  113.9W 2.0-4.0 AAAAA  Utah area                  

 

O:  6APR2021 22:54:28  40.6N  119.6W ml=2.2  EMSC   NEVADA                       

P:  5APR2021 132712    40.2N  119.6W 2.5-4.6 AAAAA  California/Nevada area     

 

ALASKA

 

O:  6APR2021 09:02:13  50.8N  177.3W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  4APR2021 132749    51.6N  177.6W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

O:  7APR2021 06:35:36  59.9N  153.5W ml=3.3  EMSC   SOUTHERN ALASKA              

P:  5APR2021 132770    60.3N  153.0W 3.2-5.0 AAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

No events of M>=2 were located in the northwestern U.S. or western Canada today.

 

ROCKY MOUNTAINS REGION

 

O: 06APR2021 09:33:43  44.5N  115.2W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 06APR2021 14:43:03  44.5N  115.2W Ml=2.4  EMSC   SOUTHERN IDAHO

O:  7APR2021 04:42:11  44.3N  115.2W ML=3.2  EMSC   SOUTHERN IDAHO               

P:  6APR2021 132723    44.4N  115.1W 2.0-4.2 AAAAA  Montana/Idaho              

 

O:  6APR2021 19:20:39  41.5N  112.9W Ml=3.5  EMSC   UTAH                         

P:  7APR2021 132706    39.6N  111.9W 2.0-4.0 ABAAA  Utah area                  

 

NEIC reported this earthquake of M 3.5 in Northern Utah was felt with intensity V in the area(s) of  Northern Utah.

 

EASTERN U.S./CANADA

 

 

O:  6APR2021 12:05:19  39.2N   99.2W mb=2.7  EMSC   KANSAS                       

P:  4APR2021 132700    38.0N   99.0W 2.0-4.4 ABAAA  Southern Plains            

 

NEIC reported this earthquake of M 2.7 in Kansas was felt with intensity II-III in the area(s) of Kansas at Plainville.

 

O:  6APR2021 08:13:46  49.1N   66.9W MB=2.0  ECAN Cap-Chat, QC                   

P:  4APR2021 132715    49.0N   66.0W 2.0-4.0 AAAAA  E. of Maine                

 

O:  6APR2021 06:16:25  50.0N   60.8W MB=2.5  ECAN La Romaine, QC                 

O:  6APR2021 06:03:51  50.0N   60.8W MB=1.6  ECAN La Romaine, QC                 

P:  4APR2021 132715    49.0N   66.0W 2.0-4.0 AACAA  E. of Maine                

 

HAWAII

 

O:  7APR2021 02:55:39  19.2N  155.4W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7APR2021 132633    20.1N  156.1W 4.0-5.7 AAAAA  Hawaii area                

 

STRONG AFTERSHOCK IN NEW ZEALAND; SWARM IN LOS ANGELES, CALIFORNIA

 

EARTHQUAKE SUMMARY FOR  APRIL 5, 2021

 

The strongest earthquake in the world today was an aftershock of M 6.0 north of North Island, New Zealand. NEIC reported it was felt with intensity VI in Gisborne, North Islands, New Zealand at Ruatoria; V in Tolaga Bay, Nuhaka, Hawke's  Bay; IV in the Bay of Plenty at Te Kaha, Opotiki and Gisborne and II-III in Turangi, Palmerston North, and Wellington. GEONET reported this event was felt with moderate intensity in North Island, New Zealand with 7826 reports of which 4999 reported weak shaking; 2451 light, 349 moderate, 17 strong, 3 Severe and 7 extreme intensity. This is the strongest aftershock of the M 7.3 off North Island, New Zealand of March 4 since an M 6.0-6.1 on March 6, a month ago. Forecast 132819 had  expected today's enhanced activity was likely around April 5.

 

O: 05APR2021 07:07:43  37.4S  179.9E ML=3.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O: 05APR2021 07:37:53  37.6S  179.5E Mw=6.0  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O: 05APR2021 07:37:52  37.6S  179.7E ML=6.5  GEONET Felt with moderate intensity

O: 05APR2021 15:20:25  37.7S  179.6E ML=4.1  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O:  5APR2021 14:00:17  37.4S  179.9E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  5APR2021 132819    38.0S  177.0E 3.0-4.6 AABAA  North Island, N.Z.         

 

An M 4.0-4.1 was widely felt in the region of Los Angeles, California today. NEIC reported maximum intensity IV in the Los Angeles area at Inglewood, with lesser shaking in Gardena, Hawthorne, and as far as central California with lesser shaking. It was associated with smaller foreshocks and aftershocks lightly felt in the area. This activity follows a moderately strong quake of M 5.4 in the Gulf of California yesterday. It has been shown that events in these areas which are on the same faults systems can promote seismicity to the north, as may be the situation in this case. Regional seismicity in California often peaks in April with a spike in mid-month. It has been argued that this is related to regional weather systems in this semi-arid region. For example, the San Francisco earthquake of M 7.8 in April, 1906 was preceded by series of strong earthquakes in mid-April during the previous 30 years. When an M 3.0 hit the region of San Fernando Valley, California west of Los Angeles on  February 26, 2021 this summary noted the possibility of tidal triggering as:

 

"An earthquake of M 3.0 occurred near local solar noon in the Simi Valley west of Los Angeles today. NEIC reported intensity II-III in Simi Valley, Canoga Park, West Hills, Chatsworth, Oak Park, Winnetka, Porter Ranch and Thousand Oaks, California among others. This is the strongest earthquake in the Simi Valley area of California since an M 4.2 and 3.8 on July 30, 2020. It was likely promoted by strong tidal stresses associated with the full moon of February 27 as it occurred within about an hour of local solar noon, a time when tidal stresses area maximized." (February 27, 2021)

 

and

 

"Several minutes before the Simi Valley quake an M 3.7 occurred near Ridgecrest in Central California. It was reported to have been lightly felt in that area. It also occurred within minutes of local solar noon and was probably promoted by high tidal stresses with the full moon which maximize near this hour." (February 27, 2021)

 

Today's activity within about 25 km of an M 4.5 on September 19, 2020 may  be aftershocks of that event. The only other event of M>=4.0 in the area  in the past seven years was an M 4.2 on July 30, 2020 indicating a return to active conditions for the area in the past year.

 

A foreshock of M 3.0 was recorded on April 1, 2021. This was probably promoted by high tidal stresses associated with the full moon of March 28. At the time this summary noted:  

 

"NEIC reported this earthquake of M 3.0 in Los Angeles, California was felt with intensity IV in the area(s) of Huntington Park and Maywood, Los Angeles, California." (April 2, 2021)

 

Forecasts 132691 and 132693 expected this activity within about 30 km was likely  around April 3-4.

 

O: 05APR2021 11:44:00  33.9N  118.3W ML=4.1  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 12:27:47  33.9N  118.3W Ml=2.3  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 12:53:07  33.9N  118.3W Ml=2.3  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 13:19:22  33.9N  118.3W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 14:57:54  33.9N  118.3W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 21:37:45  33.9N  118.4W Ml=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 11:47:04  34.0N  118.4W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 11:48:40  34.0N  118.3W Ml=2.4  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 12:29:48  34.0N  118.3W Ml=2.4  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 06APR2021 01:10:17  34.0N  118.4W Ml=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 06APR2021 01:12:21  34.0N  118.3W Ml=2.1  EMSC   GREATER LOS ANGELES AREA, CALIF.

O:  5APR2021 11:15:37  33.9N  118.3W ML=3.0  EMSC   GREATER LOS ANGELES AREA, CALI

P:  3APR2021 132691    34.2N  117.8W 2.5-4.6 AAAAA  So. California             

P:  4APR2021 132693    34.0N  118.7W 2.5-4.8 AAAAA  So. California             

 

 

An M 5.1 was widely felt in the region of northern India and Bhutuan today. NEIC reported it was felt with intensity VI in Sikkin at Singtam; V in Gangtok, Mal Bangla, Kalimpong, Mamchi, Dhupguri  and in Tshongdue, Bhutan. Intensity IV was felt in Sikkim, India at Rangpo, Odlabari, India and Phuentsholing, Bhutan.

NEIC reported the earthquake of M 3.9 in India-Bangladesh border was felt with intensity II-III in the area(s) of India-Bangladesh border in India at Jalpaiguri, Gangtok and in Dala Bhutan.  This is the strongest earthquake within about 200 km of this epicenter since an M 5.3 southeast of this on September 12, 2018 about 200 km away and an M 7.3 about 250 km northwest of this on May 12, 2015. Forecast 132638 had expected today's event was likely around April 8. This epicenter is near 104 degrees from the  M 8.1 in the Kermadec Islands of March 4 and may have been promoted by energy from that source.

 

O: 06APR2021 01:36:55  26.6N   88.6E mb=3.9  EMSC   INDIA-BANGLADESH BORDER REGION

O:  5APR2021 15:19:59  27.2N   88.9E Mw=5.1  EMSC   SIKKIM, INDIA                

P:  8APR2021 132638    27.0N   88.0E 3.5-5.4 BAAAA  Nepal                      

 

Also in Asia an M 4.7 was recorded in Turkmenistan. This is the strongest earthquake in Turkmenistan since an M 5.2 southeast of today's epicenter on September 26, 2020. That earthquake was also associated with a moderate quake in India - 

 

 

"Moderate seismicity shook several areas of central Asia today with an M 5.3 in Turkmenistan and several events including an M 5.3 in Kashmir and Jammu, India. Moderate earthquakes of M 4.5-5.0 also occurred in central Asia today in Pakistan, southern China and Hindu Kush, Afghanistan." (September 26, 2020)

 

and

 

"The strongest earthquake in the world today was an M 5.2-5.3 in Turkmenistan. It was felt with intensity II-III in northern Iran at Gonbad-e, Kavus and Sherwan, CKhorasan, Shamali. An M 4.7 regional aftershock followed about 200 km northwest of today's M 5.2  of the mainshock and was felt with intensity IV in Balkanabat, Balka, Turkmenistan. The last earthquake of M>=5.2 within about 200 km of the event of M 5.2 today occurred as an M 5.9 on August 22, 2000." (September 26, 2020)

 

Forecast 132718 had expected today's M 4.7 in Turkmenistan was likely within  about 50 km around April 5.

 

O:  5APR2021 11:33:28  39.5N   54.8E mb=4.7  EMSC   TURKMENISTAN                 

P:  5APR2021 132718    40.0N   55.0E 4.0-5.5 AAAAA  Kazakhstan                 

 

The series of moderate earthquakes in ocean Ridge areas continued today with reduced magnitudes. These events of moderate magnitude occurred in  the southeast Indian Ridge (M 4.8); the South Atlantic aftershock zone of the M 6.6 there (M 5.2) and in the South Shetland Islands (M 4.4). 

 

 

GUC reported the earthquake in the South Shetland Islands was felt with intensity III in  Antartida at Antartida, Base Frei and in Base Fildes, Chile. This earthquake occurred near local solar midnight and may have been promoted by high tidal stresses. The last quake in the South Shetland Islands area of larger magnitude was an M 5.0 on March 28 which occurred with the full moon. Forecast 132834 had expected today's activity was likely within about 100 km around April 5.

 

O:  6APR2021 01:59     62.4S   58.4W mb=4.2  GUC    Antartida at Antartida, Base F

O:  6APR2021 01:59:55  62.2S   58.5W mb=4.4  EMSC   SOUTH SHETLAND ISLANDS       

P:  5APR2021 132834    61.0S   58.0W 3.0-5.6 ABAAA  So. So. America            

 

The M 4.8 in the Southeast Indian Ridge is the largest in that area within about 250 km since an M 5.1 on May 24, 2018 that followed an M 6.3 on March 24, 2018 and may be an aftershock of that event. Forecast 132825 had expected today's event was likely within about 100 km around April 5.

 

O:  5APR2021 20:24:11  45.1S   95.8E ML=4.8  EMSC   SOUTHEAST INDIAN RIDGE        

P:  5APR2021 132825    46.0S   96.0E 4.0-5.4 AAAAA  So. Indian Ocean           

 

The earthquake of M 5.2 in the area east of South Sandwich Islands the largest aftershock to date of the M 6.6 on April 3. Forecast 132831 had expected today's aftershock was likely around April 6.

 

O:  5APR2021 20:31:51  58.0S    8.2W mb=5.2  EMSC   EAST OF SOUTH SANDWICH ISLANDS

P:  5APR2021 132831    56.0S    7.0W 4.0-5.6 ABAAA  Atlantic-Indian Ridge      

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 06APR2021 01:36:55  26.6N   88.6E mb=3.9  EMSC   INDIA-BANGLADESH BORDER REGION

O:  5APR2021 15:19:59  27.2N   88.9E Mw=5.1  EMSC   SIKKIM, INDIA                

P:  8APR2021 132638    27.0N   88.0E 3.5-5.4 BAAAA  Nepal                      

 

O:  5APR2021 11:33:28  39.5N   54.8E mb=4.7  EMSC   TURKMENISTAN                 

P:  5APR2021 132718    40.0N   55.0E 4.0-5.5 AAAAA  Kazakhstan                 

 

O:  5APR2021 13:43:05  54.8N  163.3E mb=4.8  EMSC   OFF EAST COAST OF KAMCHATKA  

P:  7APR2021 132756    56.0N  165.0E 4.0-5.6 ABAAA  Komandorsky Isl            

 

INDONESIA AND PHILIPPINES

 

O:  6APR2021 00:29:36   1.4S  137.2E ML=4.5  EMSC   NEAR N COAST OF PAPUA, INDONES

P:  9APR2021 132599     1.0S  137.0E 4.0-5.4 BAAAA  West Irian, PNG            

 

O:  6APR2021 02:36:25   3.8N   95.9E ML=4.1  EMSC   OFF W COAST OF NORTHERN SUMATR

P:  7APR2021 132576     4.0N   96.0E 4.0-5.8 AAAAA  Nicobar Islands            

 

O:  5APR2021 10:33:14   5.8S  129.9E ML=4.0  EMSC   BANDA SEA                    

O:  6APR2021 05:27:47   7.7S  128.4E ML=4.5  EMSC   KEPULAUAN BARAT DAYA, INDONESI

P:  5APR2021 132580     6.0S  128.0E 4.0-5.4 ABAAA  Banda Sea                  

 

O:  6APR2021 00:29:36   1.4S  137.2E ML=4.5  EMSC   NEAR N COAST OF PAPUA, INDONES

P:  9APR2021 132599     1.0S  137.0E 4.0-5.4 BAAAA  West Irian, PNG            

 

O:  5APR2021 22:09:01  15.1N  146.4E mb=4.6  EMSC   SAIPAN REG., N. MARIANA ISLAND

P:  6APR2021 132624    14.0N  147.0E 4.0-5.4 ABAAA  So. Marianas/Guam          

 

NEIC reported this earthquake of M 4.6 in Saipan, Mariana Islands was felt with intensity II-III in the area(s) of Saipan, Mariana Islands at Tinian and Yigo, Guam.

 

 

CENTRAL AND SOUTH AMERICA

 

O:  5APR2021 16:41:58   3.6S   80.8W ML=4.3  EMSC   PERU-ECUADOR BORDER REGION   

P:  9APR2021 132583     4.0S   80.0W 4.0-5.5 BAAAA  Ecuador                    

 

O:  6APR2021 00:15:28   8.2S   74.5W mb=4.4  EMSC   CENTRAL PERU                 

P: 31MAR2021 132314     9.0S   75.0W 3.5-5.0 CAAAA  Brazil                     

 

O:  5APR2021 17:57:32  16.2N   94.3W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO      

P:  8APR2021 132605    16.0N   93.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

 

O:  6APR2021 05:22:05  18.4N   73.6W mb=4.6  EMSC   HAITI REGION                 

P:  8APR2021 132623    19.0N   71.0W 3.4-5.2 AABAA  Puerto Rico                

 

NEIC reported this earthquake of M 4.6 in Haiti was felt with intensity II-III in the area(s) of Haiti in Baraderes amd Roche-a-Bateau.

 

O:  5APR2021 20:35:37  18.8N   67.5W Md=3.4  EMSC   PUERTO RICO REGION           

O:  5APR2021 09:24:54  19.1N   68.1W Md=3.5  EMSC   DOMINICAN REPUBLIC REGION    

P:  4APR2021 132623    19.0N   68.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O:  6APR2021 02:26:56  24.2S   67.1W mb=4.6  EMSC   SALTA, ARGENTINA             

P:  5APR2021 132797    24.0S   68.0W 4.0-5.8 AAAAA  Argentina                  

 

NEIC reported this earthquake of M 4.6 in San Juan, Argentina was felt with intensity II-III in the area(s) of San Juan, Argentina.

 

O:  6APR2021 05:47:16  31.4S   68.1W mb=4.6  EMSC   SAN JUAN, ARGENTINA          

P:  5APR2021 132812    31.0S   68.0W 4.0-5.7 AAAAA  Central Chile              

 

O:  5APR2021 11:51:21  36.1S   73.5W mb=4.5  EMSC   OFFSHORE BIO-BIO, CHILE      

P:  7APR2021 132814    36.0S   73.0W 4.0-6.0 AAAAA  Central Chile              

 

NEIC reported this earthquake of M 4.5 in Concepcion, BioBio, Chile was felt with intensity II-III in the area(s) of Concepcion, BioBio, Chile.

 

O:  5APR2021 08:22:45  28.0N  112.2W ML=3.6  EMSC   GULF OF CALIFORNIA           

P:  9APR2021 132632    28.0N  112.0W 3.5-5.3 BAAAA  Gulf of California          

 

O:  5APR2021 21:27:43  38.9S   72.1W mb=4.1  EMSC   ARAUCANIA, CHILE             

P:  6APR2021 132815    39.0S   73.0W 4.0-5.4 AAAAA  Central Chile              

 

 

AFRICA AND EUROPE

 

No significant (M>=5) or unusual earthquakes were reported in Europe today.

 

SOUTHWEST PACIFIC

 

O:  5APR2021 08:11:37  17.6S  179.2E mb=4.7  EMSC   FIJI                         

P:  4APR2021 132786    17.0S  178.0E 4.0-5.4 AAAAA  Fiji Islands               

 

OCEAN RIDGES

 

O:  6APR2021 01:59     62.4S   58.4W mb=4.2  GUC    Antartida at Antartida, Base F

O:  6APR2021 01:59:55  62.2S   58.5W mb=4.4  EMSC   SOUTH SHETLAND ISLANDS       

P:  5APR2021 132834    61.0S   58.0W 3.0-5.6 ABAAA  So. So. America            

 

P:  5APR2021 132834    61.0S   58.0W 3.0-5.6 ABAAA  So. So. America            

 

GUC reported this earthquake was felt with intensity III in  Antartida at Antartida, Base Frei and in Base Fildes, Chile.

 

O:  5APR2021 20:24:11  45.1S   95.8E ML=4.8  EMSC   SOUTHEAST INDIAN RIDGE       

P:  5APR2021 132825    46.0S   96.0E 4.0-5.4 AAAAA  So. Indian Ocean           

 

O:  5APR2021 20:31:51  58.0S    8.2W mb=5.2  EMSC   EAST OF SOUTH SANDWICH ISLANDS

P:  5APR2021 132831    56.0S    7.0W 4.0-5.6 ABAAA  Atlantic-Indian Ridge      

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 05APR2021 07:07:43  37.4S  179.9E ML=3.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O: 05APR2021 07:37:53  37.6S  179.5E Mw=6.0  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O: 05APR2021 07:37:52  37.6S  179.7E ML=6.5  GEONET Felt with moderate intensity

O: 05APR2021 15:20:25  37.7S  179.6E ML=4.1  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O:  5APR2021 14:00:17  37.4S  179.9E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  5APR2021 132819    38.0S  177.0E 3.0-4.6 AABAA  North Island, N.Z.         

 

O:  5APR2021 19:35:23  29.5S  177.1W mb=5.0  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  5APR2021 132802    29.0S  176.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

O:  5APR2021 23:58:09  31.3S  179.2E mb=4.4  EMSC   KERMADEC ISLANDS REGION      

P:  5APR2021 132821    31.0S  178.0E 4.0-5.6 AAAAA  So. Kermadec Islands       

 

O:  5APR2021 14:00:17  37.4S  179.9E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  5APR2021 132819    38.0S  177.0E 3.0-4.6 AABAA  North Island, N.Z.         

 

O:  5APR2021 10:54:02  37.5S  179.8W ML=3.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  5APR2021 132818    37.0S  179.0W 3.5-5.0 AAAAA  E. of North Islands N.Z.   

 

O:  6APR2021 00:36:29  38.0S  176.5E ML=3.9  EMSC   NORTH ISLAND OF NEW ZEALAND  

P:  5APR2021 132819    38.0S  177.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

O:  5APR2021 23:42:48  39.0S  175.0E ML=3.9  EMSC   NORTH ISLAND OF NEW ZEALAND  

P:  7APR2021 132824    40.0S  175.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

O:  5APR2021 17:31:16  47.5S  166.3E ML=3.9  EMSC   OFF W. COAST OF S. ISLAND, N.Z

P:  4APR2021 132827    45.0S  167.0E 3.0-5.1 ABAAA  So. Island, N.Z.           

 

JAPAN AND KURIL ISLANDS

 

No earthquakes of M>=4 were located in Japan or the Kuril Islands today.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 05APR2021 20:27:22  40.3N  124.6W Ml=2.8  EMSC   OFFSHORE NORTHERN CALIFORNIA

O:  5APR2021 11:42:38  40.3N  124.6W Md=2.4  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  3APR2021 132732    40.3N  124.7W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

NEIC reported this earthquake of M 2.8 offshore Northern California  was felt with intensity II-III in the area(s) of  Northern California at Ukiah.

 

O: 05APR2021 11:44:00  33.9N  118.3W ML=4.1  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 12:27:47  33.9N  118.3W Ml=2.3  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 12:53:07  33.9N  118.3W Ml=2.3  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 13:19:22  33.9N  118.3W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 14:57:54  33.9N  118.3W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 21:37:45  33.9N  118.4W Ml=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 11:47:04  34.0N  118.4W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 11:48:40  34.0N  118.3W Ml=2.4  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 05APR2021 12:29:48  34.0N  118.3W Ml=2.4  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 06APR2021 01:10:17  34.0N  118.4W Ml=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 06APR2021 01:12:21  34.0N  118.3W Ml=2.1  EMSC   GREATER LOS ANGELES AREA, CALIF.

O:  5APR2021 11:15:37  33.9N  118.3W ML=3.0  EMSC   GREATER LOS ANGELES AREA, CALI

P:  3APR2021 132691    34.2N  117.8W 2.5-4.6 AAAAA  So. California             

P:  4APR2021 132693    34.0N  118.7W 2.5-4.8 AAAAA  So. California             

 

O: 05APR2021 16:08:48  33.5N  116.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O:  5APR2021 21:20:44  32.3N  115.3W Ml=3.0  EMSC   BAJA CALIFORNIA, MEXICO      

P:  4APR2021 132689    32.9N  115.6W 2.5-4.4 AAAAA  So. California             

 

O:  6APR2021 03:04:24  33.0N  116.4W Ml=2.3  EMSC   SOUTHERN CALIFORNIA          

P:  6APR2021 132690    33.4N  116.7W 2.5-4.5 AAAAA  So. California             

 

 

O: 05APR2021 20:34:08  36.6N  121.1W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 05APR2021 22:30:47  36.6N  121.2W Md=2.1  EMSC   CENTRAL CALIFORNIA

O:  5APR2021 18:14:44  36.6N  121.2W Md=2.2  EMSC   CENTRAL CALIFORNIA           

P:  6APR2021 132658    36.2N  120.8W 2.5-4.9 AAAAA  Central California          

 

O:  6APR2021 01:44:52  37.6N  121.6W Md=2.4  EMSC   NORTHERN CALIFORNIA          

P:  5APR2021 132661    37.7N  121.9W 2.5-4.7 AAAAA  Central California         

 

O:  5APR2021 13:33:33  38.2N  118.1W ml=2.1  EMSC   NEVADA                       

P:  4APR2021 132655    38.6N  118.6W 2.5-4.7 AAAAA  California/Nevada area     

 

O:  5APR2021 16:42:01  38.8N  122.7W Md=2.7  EMSC   NORTHERN CALIFORNIA          

P:  4APR2021 132662    38.9N  122.8W 2.5-4.4 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.7 in the Geysers, California was felt with intensity II-III in the area(s) of Kelseyville, California.

 

 

 

ALASKA

 

O: 05APR2021 16:43:30  58.5N  137.2W ml=3.0  EMSC   SOUTHEASTERN ALASKA

O: 05APR2021 16:44:30  58.5N  137.1W ml=3.1  EMSC   SOUTHEASTERN ALASKA

O: 05APR2021 17:42:48  58.5N  137.1W ml=3.0  EMSC   SOUTHEASTERN ALASKA

O: 05APR2021 23:56:36  58.5N  137.1W ML=3.1  EMSC   SOUTHEASTERN ALASKA

O:  5APR2021 13:47:30  58.5N  137.1W ML=3.0  EMSC   SOUTHEASTERN ALASKA          

P:  3APR2021 132764    59.0N  139.0W 3.0-4.8 AAAAA  Southeast Alaska           

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  5APR2021 08:01:31  42.1N  124.3W Ml=2.3  EMSC   OREGON                       

P:  3APR2021 132732    40.3N  124.7W 2.5-4.4 ABAAA  Off Coast of No. Calif     

 

O:  5APR2021 18:43:22  47.0N  122.2W Md=2.0  EMSC   PUGET SOUND REGION, WASHINGTON

P:  3APR2021 132743    48.4N  123.2W 2.0-4.1 ABAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O:  5APR2021 20:56:42  38.7N  112.1W ML=3.2  EMSC   UTAH                         

P:  9APR2021 132706    38.6N  112.7W 2.0-3.9 BAAAA  Utah area                  

 

NEIC reported this earthquake of M 3.0 in Central Utah was felt with intensity II-III in the area(s) of Central Utah at Monroe, Richfield and Salina.

 

O: 05APR2021 10:05:38  44.5N  115.2W Ml=3.0  EMSC   SOUTHERN IDAHO

O:  5APR2021 10:24:37  44.4N  115.2W Ml=2.1  EMSC   SOUTHERN IDAHO               

P:  6APR2021 132723    44.4N  115.1W 2.0-4.2 AAAAA  Montana/Idaho               

 

EASTERN U.S./CANADA

 

NEIC reported an earthquake of M  3.1 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma in Mustang, El Reno.

 

HAWAII

 

No earthquakes of M>=3 were located in Hawaii.

 

MODERATE QUAKE SHAKES GULF OF CALIFORNIA

 

EARTHQUAKE SUMMARY FOR  APRIL 4, 2021

 

The strongest earthquake in the world today was an M 5.4 in the Gulf of California. NEIC reported it was felt with intensity II-III in Baja California at Los Cabos and Cabo San Lucas. This earthquake occurred near local solar noon and was probably promoted by high tidal stresses which maximize near this hour. The last earthquake with M>=5.4 within about 150 km of this epicenter was an M 5.5 on October 8, 2018 and prior to that an M 5.5 on September 22, 2017. The last of significantly larger magnitude was an M 6.6 on September 13, 2015. This earthquake may have been promoted by antipodal effects from a tropical cyclone south of Java at the end of March. This summary had suggested that this could help promote seismicity in the Gulf of California at this time as:

 

"A tropical cyclone may be forming in the south Indian Ocean. This system is currently located at 11S 68E with winds up to 33 kts and moving to the ESE. Some regional mid-ocean ridge activity is may be enhanced with this storm. The antipode is in the Gulf of California at 11N 112W. Activity in this area may also see enhanced seismicity with this storm." (March 28-30, 2021)

 

Forecast 132359 had expected today's activity within about 25 km of this epicenter was likely around March 31.

 

O: 04APR2021 18:43:26  24.0N  108.7W Mw=5.4  EMSC   GULF OF CALIFORNIA

O:  4APR2021 13:56:29  23.9N  108.9W ML=4.2  EMSC   GULF OF CALIFORNIA           

P: 31MAR2021 132359    24.0N  109.0W 3.5-5.0 BAAAA  Gulf of California         

 

O:  4APR2021 19:02:57  27.7N  111.7W ML=3.4  EMSC   GULF OF CALIFORNIA           

P: 31MAR2021 132359    28.0N  112.0W 3.5-5.1 BAAAA  Gulf of California         

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in Central Alaska. NEIC reported this earthquake of M 3.7-3.8 in Central Alaska was felt with intensity II-III in the area(s) of Central Alaska at Tok and North Pole.  Two earthquakes of equal or larger magnitude have occurred within about 150 km of this epicenter in the past four years - an M 4.1 on October 26, 2020, possibly triggered by the M 7.6 in the Alaska Peninsula of October 19, 2020 and an M 4.0 on October 10, 2019. Forecast 132771 had expected today's event in this region was likely around April 8.

 

O:  4APR2021 17:09:21  63.3N  143.4W ML=3.8  EMSC   CENTRAL ALASKA               

P:  8APR2021 132771    63.1N  144.7W 3.2-5.1 BAAAA  Central Alaska             

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O:  4APR2021 20:09:53  36.9N   75.8E mb=4.2  EMSC   KASHMIR-XINJIANG BORDER REGION

P:  5APR2021 132668    36.0N   72.0E 3.8-5.2 AACAA  Hindu Kush/Pakistan        

 

O:  5APR2021 01:28:40  42.0N   81.1E mb=4.8  EMSC   NORTHERN XINJIANG, CHINA     

P:  5APR2021 132719    42.0N   82.0E 4.0-5.4 AAAAA  Kirgizstan/Xinjiang        

 

No significant (M>=5) or unusual earthquakes were reported in Asia today.

 

INDONESIA AND PHILIPPINES

 

O:  5APR2021 05:40:35   3.7N  126.9E mb=4.6  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  8APR2021 132572     4.0N  128.0E 4.0-5.6 BAAAA  Halmahera                  

 

O:  5APR2021 02:32:46   7.3S  129.2E mb=4.4  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 30MAR2021 132313     7.0S  129.0E 4.0-5.4 CAAAA  Banda Sea                  

 

O:  4APR2021 13:39:50   9.2S  110.1E ML=4.3  EMSC   SOUTH OF JAVA, INDONESIA     

P:  7APR2021 132592     9.0S  110.0E 4.0-5.4 BAAAA  So. of Java                

 

No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.

 

CENTRAL AND SOUTH AMERICA

 

O:  4APR2021 04:17     29.0S   71.9W mb=4.6  GUC    Coquimbo at La Higuera;III in

P:  4APR2021 132817    30.0S   71.0W 4.0-5.5 AAAAA  Coast Central Chile        

 

GUC reported this earthquake was felt with intensity  IV in  Coquimbo at La Higuera;III in La Serena, Monte Patria and Vicuna and with III in Atacma at Alto del Carmen, Freirina, Huasco, Vallenar, Chile.

 

O:  5APR2021 03:41:30  10.6N   83.1W ML=4.0  EMSC   COSTA RICA                   

P:  5APR2021 132603    10.0N   84.0W 3.5-5.5 AAAAA  Caribbean Sea              

 

O:  4APR2021 10:17:54   9.0S   75.2W ML=4.0  EMSC   CENTRAL PERU                 

P: 31MAR2021 132314     9.0S   75.0W 3.5-5.0 BAAAA  Brazil                     

 

O:  5APR2021 04:31:39  12.7N   88.5W ML=4.0  EMSC   OFFSHORE EL SALVADOR         

P:  7APR2021 132617    13.0N   87.0W 3.5-5.8 AABAA  Nicaragua                   

 

O:  5APR2021 06:48:33  15.2S   71.7W ML=4.0  EMSC   SOUTHERN PERU                

P:  3APR2021 132792    16.0S   71.0W 4.0-5.7 AAAAA  So. Peru/Bolivia           

 

O:  4APR2021 11:46:33  16.0N   95.8W ML=4.0  EMSC   OAXACA, MEXICO                

P:  6APR2021 132620    15.0N   96.0W 3.5-5.2 AAAAA  Oaxaca, Mexico             

 

O:  4APR2021 19:29:19  17.3N   91.7W ML=4.0  EMSC   CHIAPAS, MEXICO              

P:  8APR2021 132605    16.0N   93.0W 3.5-5.3 BBAAA  Chiapas, Mexico            

 

O:  5APR2021 04:26:53  17.7N  101.5W ML=4.3  EMSC   GUERRERO, MEXICO             

P:  5APR2021 132615    19.0N  102.0W 3.5-5.5 ABAAA  Michoacan, Mexico          

 

O:  4APR2021 11:19:56  18.1N  103.3W ML=4.3  EMSC   OFFSHORE MICHOACAN, MEXICO   

P:  9APR2021 132615    18.0N  103.0W 3.5-5.4 BAAAA  Michoacan, Mexico          

 

O:  5APR2021 06:58:49  18.3N   67.6W Md=3.2  EMSC   MONA PASSAGE, PUERTO RICO    

P:  4APR2021 132623    19.0N   68.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O:  4APR2021 16:13:42  18.3N   71.3W ML=3.0  EMSC   DOMINICAN REPUBLIC           

O: 04APR2021 07:17:02  19.1N   71.2W ML=3.0  EMSC   DOMINICAN REPUBLIC

P:  4APR2021 132628    20.0N   71.0W 3.0-4.6 ABAAA  Bahamas/No. Caribbean      

 

O:  4APR2021 07:39:29  19.2N   69.9W ML=3.0  EMSC   DOMINICAN REPUBLIC           

P:  5APR2021 132628    20.0N   69.0W 3.0-4.7 AAAAA  Bahamas/No. Caribbean      

 

O: 04APR2021 18:43:26  24.0N  108.7W Mw=5.4  EMSC   GULF OF CALIFORNIA

O:  4APR2021 13:56:29  23.9N  108.9W ML=4.2  EMSC   GULF OF CALIFORNIA           

P: 31MAR2021 132359    24.0N  109.0W 3.5-5.0 BAAAA  Gulf of California         

 

O:  4APR2021 19:02:57  27.7N  111.7W ML=3.4  EMSC   GULF OF CALIFORNIA           

P: 31MAR2021 132359    28.0N  112.0W 3.5-5.1 BAAAA  Gulf of California         

 

AFRICA AND EUROPE

 

O:  5APR2021 05:02:33  40.2N   19.9E mb=4.3  EMSC   ALBANIA                      

P:  3APR2021 132677    39.0N   20.0E 3.0-4.7 ABAAA  No. Greece                 

 

No significant (M>=5) or unusual earthquakes were reported in Europe today.

 

SOUTHWEST PACIFIC

 

O:  5APR2021 01:42:47  21.8S  170.8E Mw=5.3  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P:  3APR2021 132800    22.0S  172.0E 4.0-5.4 AAAAA  Loyalty Islands            

 

O:  4APR2021 14:46:07  25.7S  179.6E mb=4.5  EMSC   SOUTH OF FIJI ISLANDS        

P:  9APR2021 132811    23.0S  179.0E 4.0-5.4 BCAAA  Tonga/Fiji                 

 

OCEAN RIDGES

 

O:  4APR2021 11:02:26   0.7N   25.4W mb=5.0  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 10APR2021 132566     1.0N   26.0W 4.0-6.1 CAAAA  Central Mid-Atlantic Ridg  

 

O:  4APR2021 16:35:36  40.9S   16.8W mb=4.8  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P: 10APR2021 132828    44.0S   16.0W 4.0-5.7 CCAAA  So. Mid-Atlantic Ridge     

 

 

ZEALANDIA AND AUSTRALIA REGION

O:  4APR2021 17:25:45  30.5S  177.3W mb=4.9  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  4APR2021 132818    30.0S  177.0W 4.0-5.5 AAAAA  No. Kermadec Islands       

 

O:  4APR2021 18:58:05  41.1S  175.8E ML=3.9  EMSC   NORTH ISLAND OF NEW ZEALAND  

P:  4APR2021 132826    41.0S  175.0E 3.0-5.3 AAAAA  So. Island, N.Z.           

 

O:  4APR2021 07:20:28  42.5S  173.1E ML=3.6  EMSC   SOUTH ISLAND OF NEW ZEALAND  

P: 26MAR2021 132556    42.0S  172.0E 3.0-4.9 CAAAA  So. Island, N.Z.           

 

O:  5APR2021 01:23:02  44.1S  168.8E ML=4.4  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 05APR2021 01:23:03  44.1S  168.8E MS=4.6  GEONET Felt with light intensity

P:  4APR2021 132827    45.0S  167.0E 3.0-5.1 AABAA  So. Island, N.Z.           

 

GEONET reported this earthquake was felt with light intensity in the area southwest of Haast, South Island. 47 reports of felt intensity came from the area east and north of the epicenter. More than 47 people reported feeling this earthquake with 40 reporting weak shaking and 7 light intensity.

 

JAPAN AND KURIL ISLANDS

 

O:  5APR2021 00:31:47  33.4N  140.6E mb=4.6  EMSC   IZU ISLANDS, JAPAN REGION    

P:  3APR2021 132683    33.0N  142.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

 

O:  4APR2021 21:21:57  34.6N  137.5E mb=4.6  EMSC   NEAR S. COAST OF HONSHU, JAPAN

P:  3APR2021 132664    34.0N  135.0E 3.5-4.9 AABAA  Central/So. Honshu Japan   

 

NEIC reported this earthquake of M 4.6 south of Honshu, Japan was felt with intensity II-III in the area(s) of Honshu, Japan at Nagakute.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O:  4APR2021 21:14:43  34.0N  117.0W ML=3.1  EMSC   SOUTHERN CALIFORNIA          

O:  4APR2021 21:14:43  34.0N  117.0W ML=3.4  ANSS   SOUTHERN CALIFORNIA          

P:  3APR2021 132691    34.2N  117.8W 2.5-4.6 AAAAA  So. California              

 

NEIC reported this earthquake of M 3.4 in Southern California was felt with intensity II-III in the area(s) of Southern Californian Calimesa (IV), Beaumont, Yucaipa, Banning, Moreno Valley, Redlands, Forest Falls, Mentone, Nuevo and San Jacinto.

 

O:  4APR2021 07:18:21  31.5N  115.5W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO      

P:  3APR2021 132686    30.2N  114.1W 2.0-4.2 ABBAA  SW U.S.A                   

 

O:  4APR2021 17:58:55  35.8N  121.3W Md=2.3  EMSC   CENTRAL CALIFORNIA           

P:  3APR2021 132684    35.7N  121.2W 2.5-4.6 AAAAA  Off So. California         

 

O:  4APR2021 22:41:41  36.1N  120.2W Md=2.2  EMSC   CENTRAL CALIFORNIA           

P:  9APR2021 132658    36.1N  120.1W 2.5-4.9 BAAAA  Central California         

 

O:  5APR2021 02:10:01  40.0N  122.7W Md=2.2  EMSC   NORTHERN CALIFORNIA          

P:  4APR2021 132731    40.6N  122.4W 2.5-4.6 AAAAA  Northern California        

 

O:  4APR2021 21:11:52  40.4N  127.5W ML=2.8  EMSC   OFF COAST OF NORTHERN CALIFORN

P:  8APR2021 132732    42.5N  126.8W 3.0-4.6 BBAAA  Off Coast of Oregon        

P: 26MAR2021 132461    40.3N  127.2W 2.5-4.6 CAAAA  Off Coast of No. Calif     

 

O:  4APR2021 16:38:40  40.5N  121.5W Md=2.2  EMSC   LASSEN PEAK AREA, CALIFORNIA 

P:  6APR2021 132731    40.7N  121.3W 2.5-4.5 AAAAA  Northern California        

 

ALASKA

 

O:  5APR2021 00:14:36  56.2N  150.0W ML=3.2  EMSC   GULF OF ALASKA               

P:  7APR2021 132773    55.0N  148.0W 3.0-5.0 ABBAA  Northern Alaska            

 

O:  5APR2021 03:48:08  61.7N  151.4W ML=3.2  EMSC   SOUTHERN ALASKA              

P:  6APR2021 132770    61.3N  150.9W 3.2-5.0 AAAAA  Central Alaska             

 

O:  4APR2021 17:09:21  63.3N  143.4W ML=3.8  EMSC   CENTRAL ALASKA               

P:  8APR2021 132771    63.1N  144.7W 3.2-5.1 BAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

No events of M>=2 were located in the northwestern U.S. or western Canada today.

 

ROCKY MOUNTAINS REGION

 

O: 04APR2021 19:03:54  44.3N  115.2W ML=2.6  EMSC   SOUTHERN IDAHO

O:  4APR2021 07:52:30  44.5N  115.2W Ml=3.0  EMSC   SOUTHERN IDAHO               

P:  6APR2021 132723    44.4N  115.1W 2.0-4.2 AAAAA  Montana/Idaho              

 

NEIC reported this earthquake of M 3.0 in Southern Idaho was felt with intensity II-III in the area(s) of Southern Idaho at McCall.

 

O:  4APR2021 10:53:05  46.7N  113.3W Ml=2.0  EMSC   WESTERN MONTANA              

P:  7APR2021 132724    45.7N  112.1W 2.0-4.3 BAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O:  4APR2021 10:07:18  37.1N   88.8W Md=2.0  EMSC   WESTERN KENTUCKY             

P:  8APR2021 132675    38.0N   90.0W 2.0-4.2 BAAAA  New Madrid area            

 

HAWAII

 

No earthquakes of M>=3 were located in Hawaii.

 

M 5.4 SHAKES NORTHERN NAMIBIA, SOUTHERN AFRICA

 

EARTHQUAKE SUMMARY FOR  APRIL 3, 2021

 

An unusual earthquake of M 5.4 hit the region of northern Namibia today. NEIC reported it was felt with maximum intensity VI in Namibia in Okahandja, IV in Khorixas and Outjo; III in Swakopmuna and I in Otjiwarongo. This is the largest earthquake in northern Namibia within about 500 km of this epicenter in at least the past 30 years. The largest earthquakes in Northern Namibia previously were an M 5.0 in southern Namibia on December, 1992 and an M 5.0-5.1 north of Namibia on June 5, 1989. An M 4.6 hit within about 25 km  of today's event on November 21, 2019. Today's event may have been promoted by the M 6.6 in the South Atlantic Ocean which occurred on April 2, the largest in

that area in at least 30 years as noted in the previous issue of this summary:

 

"The largest earthquake in the world today was an M 6.6 in the South Atlantic east of the South Sandwich Islands. This is the strongest quake within about 500 km of this epicenter since an M 6.6 on May 23, 1995, the only such event in at least the past 30 years." (April 2-3, 2021)

 

This event joins a series of unusual earthquakes in West Africa which included a series in March 6-9, 2021 which included a similar M 5.4 in Gabon. 

 

Today's epicenter in Namibia is at the third node (120 degrees) from the M 7.3 off North Island, New Zealand of March 4 and may have been promoted extensive energy from that source.

 

O:  4APR2021 01:41:02  19.9S   14.6E Mw=5.4  EMSC   NAMIBIA                       

 

An aftershock in the South Atlantic also occurred today with M 5.1.

 

Forecast 132831 had expected today's activity was likely in this region of the South Sandwich Islands around April 5 within about 200 km of today's epicenter.

 

The strongest earthquake in the world today was an M 6.0 in the Banda Sea. It may have been felt in northwestern Australia near Darwin and in Ambon, Indonesia. This quake occurred while a tropical cyclone was forming near the epicenter. This summary noted the cyclone as:

 

"A tropical cyclone may be forming south of the Banda Sea. This system is currently located at 10S 124E with winds up to 30 kts and moving to the northeast. Activity in the Banda Sea area is likely to be enhanced while this system is in the area." (April 3-4, 2021)

 

This is the strongest earthquake in the Banda Sea within about 200 km of this epicenter since an M 6.8 on May 6, 2020 and an M 7.3 on June 24, 2019.

 

Forecast 132580 had expected today's event within about 100 km was likely around

April 5. This epicenter is at 107 degrees from the M 6.6 in the South Atlantic of April 2 and may have been promoted by energy from that source. Other activity around 103 degrees from the South Atlantic M 6.6 occurred today in Fiji, Oaxaca, Mexico, northern and central Europe, Greece, Sumatra with moderate magnitudes.

 

 

O:  3APR2021 18:42:02   5.1S  128.1E Mw=6.0  EMSC   BANDA SEA                    

P:  5APR2021 132580     6.0S  128.0E 4.0-5.4 AAAAA  Banda Sea                  

 

The strongest earthquakes in the U.S. or Canada today occurred in Hawaii with M 4.3 and 3.9-4.0. NEIC reported these were felt in Hawaii with intensity IV in Pahala and II-III in Hawaii National Park, Maalehu, Captain Cook, Volcano, Holualoa, Hilo, Kealakehua, Mountain View and Paauilo.  The M 4.3 is the strongest earthquake in Hawaii Island area since an M 4.4 on December 21, 2020 and December 14, 2020. The last event in the area of significantly larger magnitude was an M 4.7 on July 27, 2020. Forecast 132610 had expected today's activity was likely within about 50 km around April 4. Some of the strongest activity in Hawaii historically has occurred in late March and early April as in 1868 and 2000.

 

O: 03APR2021 21:01:55  19.3N  155.5W ML=4.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 03APR2021 21:15:22  19.3N  155.5W ML=4.3  EMSC   ISLAND OF HAWAII, HAWAII

O:  3APR2021 10:54:30  19.2N  155.5W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

P:  4APR2021 132610    18.8N  155.2W 3.0-4.7 AAAAA  Hawaii                     

 

A series of earthquakes of M 4.0, 4.0 and 3.7 occurred today in the Gulf of

California. These began near local solar noon near a longitude expected to see enhanced seismicity with this full moon and may have been promoted by high tidal stresses which dominate at this hour. Forecast 132632 had expected this activity was likely in the Gulf of California in early April.

 

O: 03APR2021 22:28:23  26.6N  110.7W ML=4.0  EMSC   GULF OF CALIFORNIA

O: 03APR2021 20:11:23  26.7N  110.6W ML=3.7  EMSC   GULF OF CALIFORNIA

O:  3APR2021 20:14:58  26.6N  110.7W ML=4.0  EMSC   GULF OF CALIFORNIA           

P:  9APR2021 132632    28.0N  112.0W 3.5-5.3 CBBAA  Gulf of California         

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O:  4APR2021 06:16:28  36.1N   69.8E mb=4.4  EMSC   HINDU KUSH REGION, AFGHANISTAN

P:  5APR2021 132668    36.0N   72.0E 3.8-5.2 AABAA  Hindu Kush/Pakistan         

 

O:  4APR2021 04:55:34  38.0N   72.6E mb=4.3  EMSC   TAJIKISTAN                   

P:  6APR2021 132668    38.0N   73.0E 3.8-5.7 AAAAA  Hindu Kush/Pakistan        

 

No significant (M>=5) or unusual earthquakes were reported in Asia today.

 

INDONESIA AND PHILIPPINES

 

O:  4APR2021 00:35:47   2.3N   97.8E ML=4.3  EMSC   NORTHERN SUMATRA, INDONESIA  

P:  7APR2021 132576     4.0N   96.0E 4.0-5.8 BBBAA  Nicobar Islands            

 

O:  3APR2021 18:42:02   5.1S  128.1E Mw=6.0  EMSC   BANDA SEA                     

P:  5APR2021 132580     6.0S  128.0E 4.0-5.4 AAAAA  Banda Sea                  

 

O:  3APR2021 11:56:50   8.9S  122.4E ML=4.1  EMSC   FLORES REGION, INDONESIA     

P:  6APR2021 132584     8.0S  124.0E 4.0-5.6 BABAA  Flores Island area         

 

O:  4APR2021 06:02:52   9.0S  111.3E ML=4.0  EMSC   SOUTH OF JAVA, INDONESIA     

P:  7APR2021 132592     9.0S  110.0E 4.0-5.4 BAAAA  So. of Java                

 

CENTRAL AND SOUTH AMERICA

 

O: 03APR2021 22:28:23  26.6N  110.7W ML=4.0  EMSC   GULF OF CALIFORNIA

O: 03APR2021 20:11:23  26.7N  110.6W ML=3.7  EMSC   GULF OF CALIFORNIA

O:  3APR2021 20:14:58  26.6N  110.7W ML=4.0  EMSC   GULF OF CALIFORNIA           

P:  9APR2021 132632    28.0N  112.0W 3.5-5.3 CBBAA  Gulf of California         

 

O:  3APR2021 19:26:30   9.5N   84.7W ML=4.5  EMSC   COSTA RICA                   

P:  5APR2021 132570     9.0N   86.0W 3.5-5.1 AAAAA  Costa Rica                 

 

O:  3APR2021 08:23:41  15.4N   94.7W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P:  5APR2021 132605    17.0N   95.0W 3.5-5.3 ABAAA  Chiapas, Mexico            

 

O:  3APR2021 09:52:07  15.9N   98.8W ML=4.1  EMSC   OFFSHORE GUERRERO, MEXICO    

P:  6APR2021 132621    17.0N   98.0W 3.5-5.2 BBAAA  Oaxaca, Mexico             

 

O:  3APR2021 17:59:08  16.0N   96.2W mb=4.5  EMSC   OAXACA, MEXICO               

P:  5APR2021 132605    17.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O:  3APR2021 15:12:43  16.8N   99.9W ML=4.0  EMSC   OFFSHORE GUERRERO, MEXICO    

P:  7APR2021 132620    16.0N  100.0W 3.5-5.1 BAAAA  Oaxaca, Mexico             

 

O:  3APR2021 15:53:24  19.0N   69.4W ML=3.1  EMSC   DOMINICAN REPUBLIC           

P:  2APR2021 132623    18.0N   69.0W 3.4-5.2 AAAAA  Puerto Rico                

 

O:  3APR2021 07:44:39  19.1N   67.2W Md=3.2  EMSC   PUERTO RICO REGION           

P:  4APR2021 132623    19.0N   68.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O:  4APR2021 04:17:22  29.0S   72.0W ML=4.6  EMSC   OFFSHORE ATACAMA, CHILE      

P:  4APR2021 132817    30.0S   71.0W 4.0-5.5 AAAAA  Coast Central Chile        

 

NEIC reported this earthquake of M 4.4 in Atacama, Chile was felt with intensity II-III in the area(s) of Atacama, Chile at La Serena, Coquimbo (V) and Villa del Mar, Valparaiso.

 

O:  3APR2021 21:31:09  32.1S   70.0W mb=4.4  EMSC   SAN JUAN, ARGENTINA          

P:  5APR2021 132813    32.0S   71.0W 4.0-5.9 AAAAA  Central Chile              

 

 

AFRICA AND EUROPE

 

O:  4APR2021 01:41:02  19.9S   14.6E Mw=5.4  EMSC   NAMIBIA                      

 

O:  3APR2021 20:05:56  39.7N   22.2E mb=4.4  EMSC   GREECE                       

P:  5APR2021 132677    38.0N   22.0E 3.0-4.6 ABAAA  No. Greece                 

P: 31MAR2021 132466    40.0N   23.0E 3.0-5.1 BAAAA  Romania/NW Turkey          

 

NEIC reported this earthquake of M 4.4 in Greece was felt with intensity II-III in the area(s) of Greece at Larisa.

 

O:  3APR2021 09:32:21  42.3N    1.6E ML=3.8  EMSC   PYRENEES                     

O:  3APR2021 15:08:09  43.1N    3.2E ML=3.8  EMSC   NEAR SOUTH COAST OF FRANCE   

P: 28MAR2021 132443    43.0N    1.0E 3.0-5.0 BABAA  France                     

 

No significant (M>=5) or unusual earthquakes were reported in Europe today.

 

SOUTHWEST PACIFIC

 

O:  3APR2021 15:34:22  17.7S  178.5W mb=4.4  EMSC   FIJI REGION                  

P:  5APR2021 132795    17.0S  179.0W 4.0-5.6 AAAAA  Tonga Islands              

 

No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.

 

OCEAN RIDGES

 

O:  3APR2021 16:43:42   3.3S   12.1W mb=5.0  EMSC   NORTH OF ASCENSION ISLAND    

P:  3APR2021 132590     5.0S   12.0W 4.0-5.6 ABAAA  No. of Ascension Isl       

 

O:  3APR2021 20:26:01   8.7S   67.6E mb=5.0  EMSC   MID-INDIAN RIDGE             

 

O:  4APR2021 01:20:04  42.7S   82.1W mb=4.7  EMSC   WEST CHILE RISE               

P: 10APR2021 132823    43.0S   83.0W 4.0-5.5 CAAAA  Chile Rise                 

 

O:  3APR2021 11:11:29  57.9S    7.6W mb=5.0  EMSC   EAST OF SOUTH SANDWICH ISLANDS

P:  5APR2021 132831    56.0S    7.0W 4.0-5.6 ABAAA  Atlantic-Indian Ridge      

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  3APR2021 13:56:09  30.0S  177.1W mb=4.6  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  4APR2021 132818    30.0S  177.0W 4.0-5.5 AAAAA  No. Kermadec Islands       

 

O:  3APR2021 13:03:30  34.4S  179.7E ML=3.8  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 25MAR2021 132547    35.0S  179.0E 3.0-4.5 CAAAA  North Island, N.Z.         

 

O:  4APR2021 03:46:57  37.7S  179.7E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  5APR2021 132819    38.0S  177.0E 3.0-4.6 AABAA  North Island, N.Z.          

 

JAPAN AND KURIL ISLANDS

 

O:  3APR2021 15:28:10  22.5N  142.0E mb=4.5  EMSC   VOLCANO ISLANDS, JAPAN REGION

P:  7APR2021 132646    23.0N  143.0E 4.0-5.4 BAAAA  Volcano Islands            

 

O:  3APR2021 12:58:26  38.9N  142.1E mb=4.6  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 29MAR2021 132405    39.0N  141.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O:  3APR2021 22:20:03  35.0N  116.9W Ml=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 26MAR2021 132421    35.5N  116.4W 2.5-4.5 CAAAA  So. California             

 

O:  3APR2021 13:17:16  36.2N  118.1W Ml=2.0  EMSC   CENTRAL CALIFORNIA           

P:  4APR2021 132650    36.2N  117.9W 2.5-4.8 AAAAA  California/Nevada area     

 

O:  3APR2021 07:17:26  36.8N  121.5W Md=2.7  EMSC   CENTRAL CALIFORNIA           

O: 03APR2021 23:12:06  36.8N  121.5W Md=2.3  EMSC   CENTRAL CALIFORNIA

P:  3APR2021 132660    36.9N  121.7W 2.5-4.6 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.7 in Central California was felt with intensity II-III in the area(s) of Central California at San Juan Bautista, Salinas, Castroville, Gilroy, Hollister and Marina.

 

O:  4APR2021 02:55:47  38.2N  117.8W ml=2.0  EMSC   NEVADA                       

P:  3APR2021 132654    37.8N  118.2W 2.5-4.8 AAAAA  California/Nevada area     

 

ALASKA

 

O:  3APR2021 20:47:02  59.1N  152.3W ML=3.4  EMSC   SOUTHERN ALASKA              

P:  5APR2021 132770    60.3N  153.0W 3.2-5.0 ABAAA  Central Alaska             

 

O:  3APR2021 09:27:02  63.6N  150.8W ML=3.0  EMSC   CENTRAL ALASKA               

P:  4APR2021 132771    63.0N  148.6W 3.2-5.0 AAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

No events of M>=2 were located in the northwestern U.S. or western Canada today.

 

ROCKY MOUNTAINS REGION

 

O:  3APR2021 18:14:53  31.6N  104.5W ML=3.0  EMSC   WESTERN TEXAS                

P:  3APR2021 132687    32.5N  104.6W 2.0-3.9 AAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 03APR2021 19:39:51  35.1N   95.3W ML=2.4  EMSC   OKLAHOMA

O: 04APR2021 00:46:45  35.1N   95.4W ML=2.4  EMSC   OKLAHOMA

O:  3APR2021 10:12:17  35.1N   95.3W ML=2.2  EMSC   OKLAHOMA                     

P:  2APR2021 132698    34.0N   93.0W 2.0-4.1 ABBAA  Southeast U.S.              

 

HAWAII

 

O: 03APR2021 21:01:55  19.3N  155.5W ML=4.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 03APR2021 21:15:22  19.3N  155.5W ML=4.3  EMSC   ISLAND OF HAWAII, HAWAII

O:  3APR2021 10:54:30  19.2N  155.5W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

P:  4APR2021 132610    18.8N  155.2W 3.0-4.7 AAAAA  Hawaii                     

 

STRONG QUAKE EAST OF SOUTH SANDWICH ISLANDS

 

EARTHQUAKE SUMMARY FOR  APRIL 2, 2021

 

The largest earthquake in the world today was an M 6.6 in the South Atlantic east of the South Sandwich Islands. This is the strongest quake within about 500 km of this epicenter since an M 6.6 on May 23, 1995, the only such event in at least the past 30 years. It was preceded by an M 5.1 yesterday in the South Sandwich Islands. This summary in the previous issue noted the relation of this event in Kamchatka to the South Sandwich Islands as:

 

 

"A moderate earthquake of M 5.1 also continued the elevated seismicity in the South Sandwich Islands region today. This area became active (again) following the M 6.6 in the Kamchatka region of Russia on March 16. Seismic activation of the region had been expected as the area of the South Atlantic near the South Sandwich Islands is near the antipode of the M 6.6 in Kamchatka, the only quake of this magnitude since the events in New Zealand of March 4. This was discussed in this summary on March 17 as:

 

 

"The strongest earthquake in the world today was an M 6.6 off the coast of Kamchatka, Russia. NEIC reported it was felt with intensity V in Mohovaja, Kamchatka. This occurred near the antipode of the M 6.0 yesterday and was probably promoted by strong concentrated energy from that source in the South Sandwich Islands. Antipodal triggering can be important when large earthquakes are occurring." (March 17, 2021, April 1-2, 2021)

 

Kamchatka lies in the antipodal region of today's M 6.6 in the South Atlantic but other seismic areas which are antipodal are the Rat and Near Islands and the Komandorsky Island. These are likely to see enhanced seismicity in the next week.

 

Forecast 132831 had expected today's activity was likely in this region of the South Sandwich Islands around April 5 within about 200 km of today's epicenter.

 

O:  3APR2021 01:16:39  58.1S    7.9W Mw=6.6  EMSC   EAST OF SOUTH SANDWICH ISLANDS

P:  5APR2021 132831    56.0S    7.0W 4.0-5.6 ACAAA  Atlantic-Indian Ridge      

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 off the coast of Northern California. NEIC reported it was felt with intensity IV in Scotia and II-III in Ferndale, Whitethorn, Rio Dell, Hydesville, Garberville, Myers Flat, Redcrest, Mendocino and Bridgeville. This area has been active in recent days both to the east and west of today's epicenter. The last earthquake of M>=4.4 within about 100 km of today's epicenter was an M 4.7 on March 30, 2021 and this may be an aftershock of that quake. At the time this summary noted in this regard:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.7 off the coast of northern California. NEIC reported it was lightly felt in California at Eureka, McKinleyville. This is the strongest earthquake off the coast of Northern California since an M 4.8 more than a year ago on March 22, 2020 - an aftershock of an M 5.8 on March 9, 2020." (March 30-31, 2021)

 

The only other event of M>=4.4 in this region in the past year was an M 4.4 about 50 km to the west on January 17, 2021. Forecast 132732 had expected today's event within about 10 km was likely around April 3.

 

O:  2APR2021 08:21:34  40.3N  124.6W mb=4.4  ANSS   OFFSHORE NORTHERN CALIFORNIA 

O:  2APR2021 08:21:34  40.3N  124.6W mb=4.2  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  3APR2021 132732    40.3N  124.7W 2.5-4.4 AAAAA  Off Coast of No. Calif     

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O:  2APR2021 08:58:37  34.2N   87.7E mb=4.5  EMSC   WESTERN XIZANG               

P: 29MAR2021 132435    31.0N   88.0E 3.8-5.3 BCAAA  Xizang                     

 

O:  2APR2021 07:55:53  35.7N   89.4E mb=4.7  EMSC   WESTERN XIZANG               

P:  6APR2021 132708    36.0N   93.0E 3.8-5.2 BACAA  Xizang                     

 

O:  3APR2021 05:08:18  36.4N   69.1E mb=4.0  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 26MAR2021 132388    37.0N   70.0E 3.8-5.5 CAAAA  Hindu Kush/Pakistan        

 

O:  2APR2021 21:07:49  52.0N   98.9E mb=4.2  EMSC   RUSSIA-MONGOLIA BORDER REGION

P: 28MAR2021 132493    51.0N   98.0E 3.0-4.4 BAAAA  So. Siberia                

 

O:  2APR2021 07:36:25  41.2N   79.1E mb=4.1  EMSC   SOUTHERN XINJIANG, CHINA     

P: 29MAR2021 132447    40.0N   78.0E 4.0-5.4 BBAAA  Kirgizstan/Xinjiang        

 

No significant (M>=5) or unusual earthquakes were reported in Asia today.

 

INDONESIA AND PHILIPPINES

 

O:  2APR2021 07:52:21   0.4N  121.5E ML=4.2  EMSC   MINAHASA, SULAWESI, INDONESIA

P:  6APR2021 132565     0.0N  120.0E 4.0-5.4 BABAA  Celebes Sea                

P: 31MAR2021 132329     1.0S  122.0E 4.0-5.4 ABAAA  Sulawesi area              

 

O:  3APR2021 05:36:26   1.2N   98.7E ML=4.2  EMSC   NORTHERN SUMATRA, INDONESIA  

P:  4APR2021 132577     1.0N  100.0E 4.0-5.4 AABAA  So. Sumatera               

P: 28MAR2021 132311     0.0N   99.0E 4.0-5.4 BBAAA  So. Sumatera               

 

O:  3APR2021 03:54:34   1.5N  127.1E ML=4.6  EMSC   HALMAHERA, INDONESIA         

P:  6APR2021 132572     1.0N  127.0E 4.0-5.5 BAAAA  Halmahera                  

P: 28MAR2021 132307     2.0N  127.0E 4.0-5.6 BAAAA  Halmahera                  

 

O:  3APR2021 00:51:12   2.2N   96.0E ML=4.3  EMSC   SIMEULUE, INDONESIA          

P: 26MAR2021 132310     2.0N   96.0E 4.0-5.5 CAAAA  Nicobar Islands            

 

O:  2APR2021 20:09:58   2.7S  138.6E ML=4.2  EMSC   PAPUA, INDONESIA             

P: 26MAR2021 132332     3.0S  139.0E 4.0-5.6 CAAAA  West Irian, PNG             

 

O:  2APR2021 10:51:03   3.3N  127.5E mb=4.5  EMSC   KEPULAUAN TALAUD, INDONESIA  

P: 28MAR2021 132307     2.0N  127.0E 4.0-5.6 BBAAA  Halmahera                  

 

O:  2APR2021 16:47:50   5.7S  130.9E ML=4.0  EMSC   BANDA SEA                    

P: 29MAR2021 132333     6.0S  131.0E 4.0-5.4 BAAAA  West Irian, PNG            

 

O:  2APR2021 15:42:19   7.4S  129.5E ML=4.2  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 30MAR2021 132313     7.0S  129.0E 4.0-5.4 BAAAA  Banda Sea                  

 

 

No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.

 

CENTRAL AND SOUTH AMERICA

 

O:  2APR2021 23:57     31.8S   71.3W mb=4.3  GUC    Coquimbo at Combarbala, Illape

P:  4APR2021 132813    33.0S   71.0W 4.0-5.8 ABAAA  Central Chile              

P: 29MAR2021 132541    32.0S   70.0W 4.0-5.6 BAAAA  Central Chile              

 

GUC reported this earthquake was felt with intensity IV in  Coquimbo at Combarbala, Illapel and Salamanca, Chile.

 

O:  2APR2021 22:44:01   7.4N   77.0W mb=5.0  EMSC   NORTHERN COLOMBIA            

P: 26MAR2021 132303     7.0N   78.0W 4.0-5.5 CAAAA  Colombia                   

 

NEIC reported this earthquake of M 5.0 in Colombia was felt with intensity II-III in the area(s) of Colombia at Envifado and Jardin, Antioquia and Cartagena, Bolivar and V in San Miguelito, Panama.

 

O:  2APR2021 08:35:25  14.7N   94.0W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P:  3APR2021 132604    14.0N   93.0W 3.5-5.1 AAAAA  Chiapas, Mexico            

 

O:  2APR2021 07:41:03  15.2N   93.4W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO     

P:  3APR2021 132604    14.0N   93.0W 3.5-5.1 ABAAA  Chiapas, Mexico            

 

O:  3APR2021 02:06:39  17.6N   95.0W ML=4.2  EMSC   VERACRUZ, MEXICO             

P:  5APR2021 132605    17.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 02APR2021 23:22:51  17.9N   66.8W ML=3.2  EMSC   PUERTO RICO REGION

O:  2APR2021 19:14:26  18.0N   66.9W Md=3.1  EMSC   PUERTO RICO                  

P:  3APR2021 132622    18.0N   66.0W 3.4-4.9 AAAAA  Puerto Rico                

 

O:  2APR2021 09:04:09  18.5N   69.1W ML=3.1  EMSC   DOMINICAN REPUBLIC           

P:  2APR2021 132623    18.0N   69.0W 3.4-5.2 AAAAA  Puerto Rico                

 

O:  2APR2021 10:50:11  19.2N   65.0W Md=3.6  EMSC   VIRGIN ISLANDS REGION        

P: 28MAR2021 132356    20.0N   65.0W 3.0-4.6 BAAAA  Bahamas/No. Caribbean      

 

O:  2APR2021 17:56:25  28.5S   67.6W ML=4.0  EMSC   LA RIOJA, ARGENTINA          

P:  6APR2021 132798    29.0S   68.0W 4.0-5.6 BAAAA  Argentina                  

P: 26MAR2021 132529    28.0S   68.0W 4.0-5.4 CAAAA  Argentina                  

 

O:  2APR2021 23:57:42  31.8S   71.5W mb=4.4  EMSC   COQUIMBO, CHILE              

P:  5APR2021 132813    32.0S   71.0W 4.0-5.9 BAAAA  Central Chile               

 

O:  3APR2021 05:55:42  20.2N   72.3W ML=3.3  EMSC   HAITI REGION                 

P:  4APR2021 132628    20.0N   71.0W 3.0-4.6 AAAAA  Bahamas/No. Caribbean      

 

 

AFRICA AND EUROPE

 

O:  3APR2021 06:10:10  35.1N   22.7E mb=4.6  EMSC   CENTRAL MEDITERRANEAN SEA    

P:  2APR2021 132676    36.0N   22.0E 3.0-4.5 AAAAA  No. Greece                 

 

No significant (M>=5) or unusual earthquakes were reported in Europe today.

 

SOUTHWEST PACIFIC

 

O:  2APR2021 15:50:19  21.7S  179.4W mb=4.6  EMSC   FIJI REGION                  

P:  1APR2021 132809    20.0S  179.0W 4.0-5.5 ABAAA  Tonga Islands              

P:  5APR2021 132809    21.0S  178.0W 4.0-5.7 BAAAA  Tonga Islands              

 

No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.

 

OCEAN RIDGES

 

O:  2APR2021 08:26:36  52.7N   32.0W mb=4.5  EMSC   REYKJANES RIDGE              

P: 27MAR2021 132489    52.0N   30.0W 4.0-5.6 CAAAA  North Mid-Atlantic Ridge   

 

O:  3APR2021 01:16:39  58.1S    7.9W Mw=6.6  EMSC   EAST OF SOUTH SANDWICH ISLANDS

P:  5APR2021 132831    56.0S    7.0W 4.0-5.6 ACAAA  Atlantic-Indian Ridge      

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  3APR2021 01:18:31  29.1S  176.3W mb=4.9  EMSC   KERMADEC ISLANDS REGION      

P:  3APR2021 132802    29.0S  177.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

O:  2APR2021 16:27:40  35.2S  179.5E ML=4.0  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 25MAR2021 132547    35.0S  179.0E 3.0-4.5 CAAAA  North Island, N.Z.         

 

O: 02APR2021 07:05:53  37.7S  179.7E mb=4.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O: 02APR2021 07:05:56  37.7S  179.7E ML=4.7  GEONET Felt with weak intensity

O:  3APR2021 03:37:22  37.5S  179.9E ML=3.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  5APR2021 132819    38.0S  177.0E 3.0-4.6 AABAA  North Island, N.Z.         

 

GEONET reported this earthquake was felt with weak intensity in North Island, New Zealand with 4 reports of which 3 reported weak shaking; 1 light, 0 moderate, 0 strong, 0 Severe and 0 extreme intensity.

 

O:  2APR2021 15:54:29  39.8S  176.5E ML=3.8  EMSC   NORTH ISLAND OF NEW ZEALAND  

P:  4APR2021 132826    41.0S  175.0E 3.0-5.3 ABAAA  So. Island, N.Z.           

 

JAPAN AND KURIL ISLANDS

 

O:  2APR2021 11:24:04  27.1N  140.3E mb=4.5  EMSC   BONIN ISLANDS, JAPAN REGION  

P: 25MAR2021 132357    28.0N  142.0E 4.0-5.4 CABAA  Bonin Islands              

P: 31MAR2021 132357    29.0N  139.0E 4.0-5.5 ABAAA  Bonin Islands              

 

O:  2APR2021 16:36:30  37.7N  142.0E mb=4.2  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 28MAR2021 132405    38.0N  141.0E 4.0-5.7 BAAAA  Off East Coast Honshu      

 

O:  2APR2021 12:11:52  47.4N  151.9E mb=4.2  EMSC   KURIL ISLANDS                

P: 31MAR2021 132470    48.0N  153.0E 3.5-5.6 AAAAA  So. Kurils                 

 

O:  2APR2021 22:30:15  48.5N  155.6E mb=4.7  EMSC   KURIL ISLANDS                

P:  5APR2021 132727    48.0N  155.0E 3.5-5.8 BAAAA  NE Pacific                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O:  2APR2021 11:54:04  34.3N  117.2W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P:  3APR2021 132691    34.2N  117.8W 2.5-4.6 AAAAA  So. California             

P: 29MAR2021 132416    34.1N  117.4W 2.5-4.5 BAAAA  So. California             

 

O:  2APR2021 21:15:09  33.4N  118.3W Ml=2.3  EMSC   SAN PEDRO CHANNEL, CALIFORNIA

P:  4APR2021 132693    34.0N  118.7W 2.5-4.8 AAAAA  So. California             

P: 24MAR2021 132415    33.9N  118.3W 2.5-4.5 CAAAA  So. California             

 

O:  2APR2021 19:10:52  35.7N  121.3W ML=2.6  EMSC   CENTRAL CALIFORNIA           

P:  3APR2021 132684    35.7N  121.2W 2.5-4.6 AAAAA  Off So. California         

 

O:  2APR2021 09:34:44  36.6N  121.2W Md=2.5  EMSC   CENTRAL CALIFORNIA           

P:  2APR2021 132659    36.6N  120.7W 2.5-4.8 AAAAA  Central California          

P: 29MAR2021 132382    36.4N  121.0W 2.5-4.7 BAAAA  Central California         

 

NEIC reported this earthquake of M 2.5 in Central California was felt with intensity II-III in the area(s) of Central California in San Juan Bautista, Los Banos and Marina.

 

O: 02APR2021 19:08:02  38.2N  117.9W ML=4.0  EMSC   NEVADA

O: 02APR2021 19:08:02  38.2N  117.9W ML=4.3  ANSS   NEVADA

O: 02APR2021 19:26:30  38.2N  117.9W ml=2.4  EMSC   NEVADA

O:  2APR2021 17:10:08  38.2N  117.9W ML=3.4  EMSC   NEVADA                        

P:  3APR2021 132654    37.8N  118.2W 2.5-4.8 AAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 4.3 in Nevada was felt with intensity II-III in the area(s) of Nevada at Tonopah and Glenbrook.

 

O:  2APR2021 08:21:34  40.3N  124.6W mb=4.2  EMSC   OFFSHORE NORTHERN CALIFORNIA 

O: 02APR2021 09:19:19  40.3N  124.9W Md=2.5  EMSC   OFFSHORE NORTHERN CALIFORNIA

P:  3APR2021 132732    40.3N  124.7W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

ALASKA

 

O:  3APR2021 02:57:10  54.3N  159.7W mb=4.0  EMSC   SOUTH OF ALASKA              

P:  4APR2021 132747    54.7N  156.9W 3.5-5.2 AABAA  Alaska Peninsula           

P: 27MAR2021 132477    54.8N  159.7W 3.5-5.1 CAAAA  Alaska Peninsula           

 

O:  2APR2021 22:19:25  59.7N  153.1W ML=3.2  EMSC   SOUTHERN ALASKA              

P:  5APR2021 132770    60.3N  153.0W 3.2-5.0 BAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

 

O:  2APR2021 17:20:25  51.7N  131.7W MB=3.7  ECAN Village of Queen Charlotte, BC 

P:  2APR2021 132741    49.9N  130.2W 2.8-5.2 ACAAA  Vancouver Island area      

P: 27MAR2021 132482    50.5N  130.4W 3.0-5.0 BBAAA  British Colombia           

 

ROCKY MOUNTAINS REGION

 

O: 02APR2021 11:33:39  32.1N  102.1W mb=2.2  EMSC   WESTERN TEXAS

O:  2APR2021 10:43:30  32.1N  102.1W mb=2.6  EMSC   WESTERN TEXAS                

P:  3APR2021 132687    32.5N  104.6W 2.0-3.9 AABAA  SW U.S.A                   

 

NEIC reported this earthquake of M 2.5 in Western Texas was felt with intensity IV in the area(s) of Western Texas at Midland.

 

O:  2APR2021 09:04:21  44.3N  115.2W Ml=2.0  EMSC   SOUTHERN IDAHO               

P:  3APR2021 132723    44.6N  116.0W 2.0-4.2 AAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O:  2APR2021 10:05:24  35.1N   95.4W ML=2.2  EMSC   OKLAHOMA                     

P: 27MAR2021 132426    35.0N   96.0W 2.0-4.1 BAAAA  Southern Plains            

 

O:  2APR2021 20:08:56  36.1N   97.6W ML=2.0  EMSC   OKLAHOMA                     

P:  2APR2021 132699    35.0N   97.0W 2.0-4.1 ABAAA  Southern Plains            

P: 26MAR2021 132427    37.0N   98.0W 2.0-4.2 CAAAA  Southern Plains            

 

HAWAII

 

No earthquakes of M>=3 were located in Hawaii.

 

STRONG QUAKES RETURN TO SOUTHWEST PACIFIC

 

EARTHQUAKE SUMMARY FOR  APRIL 1, 2021

 

It has been one lunar month (28-29 days) since the M 8.1 in the Kermadec Islands and the M 7.3 north of North Island, New Zealand of March 4. If tidal promotion  was likely (as suspected) in those events, the area might be expected to  see significant seismicity a lunar month later. The series in New Zealand was quite active in the first two weeks following March 4, and in the past two weeks has reduced to relatively insignificant regional seismicity. So increased seismicity in the area today, while surprising to some, should come as no surprise. The strongest earthquakes of the day were an M 6.3 in the Kermadec Islands aftershock zone and an M 6.0 north of this in the Fiji Islands.

 

The M 6.3 in the Kermadec Islands was not felt in this remote area. It is the strongest aftershock to date of the M 8.1 and 7.4 quakes that hit the area on March 4, 2021. It occurred about 100 km south of those epicenter but is part of the aftershock sequence in the area. This event was followed by an M 5.6 and an M 4.5 aftershock and an M 5.1 further to the north in the Kermadec Islands. Forecasts 132546 and 132819 had expected seismic enhancement  in this area at the end of March or in early April.

 

O:  1APR2021 09:56:36  30.0S  177.7W Mw=6.3  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 01APR2021 11:58:32  30.0S  176.6W mb=4.5  EMSC   KERMADEC ISLANDS REGION

O: 01APR2021 22:10:14  30.0S  177.4W Mw=5.6  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  2APR2021 132819    30.0S  179.0W 4.0-5.9 AAAAA  No. Kermadec Islands       

P: 29MAR2021 132546    30.0S  178.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

An M 6.0 also occurred today in the Fiji Islands. NEIC reported it was felt as far as Namosi, Central Fiji Islands with intensity III. The last earthquake of M>=6.0 in the Fiji Islands within about 200 km of this epicenter was an M 6.0 on July 21, 2020. The last of larger magnitude was an M 6.5 near today's epicenter on November 8, 2019. Today's event may be an aftershock of the November, 2019 quake. Forecasts 132809 and 132540 had expected today's activity was likely at the end of March or early April in this region.

 

O:  1APR2021 15:11:18  21.9S  179.3W Mw=6.0  EMSC   FIJI REGION                  

P:  1APR2021 132809    20.0S  179.0W 4.0-5.5 ABAAA  Tonga Islands              

P: 27MAR2021 132540    23.0S  177.0W 4.0-5.6 ABBAA  Tonga Islands              

 

A moderate earthquake of M 5.1 also continued the elevated seismicity in the South Sandwich Islands region today. This area became active (again) following the M 6.6 in the Kamchatka region of Russia on March 16. Seismic activation of the region had been expected as the area of the South Atlantic near the South Sandwich Islands is near the antipode of the M 6.6 in Kamchatka, the only quake of this magnitude since the events in New Zealand of March 4. This was discussed in this summary on March 17 as:

 

 

"The strongest earthquake in the world today was an M 6.6 off the coast of Kamchatka, Russia. NEIC reported it was felt with intensity V in Mohovaja, Kamchatka. This occurred near the antipode of the M 6.0 yesterday and was probably promoted by strong concentrated energy from that source in the South Sandwich Islands. Antipodal triggering can be important when large earthquakes are occurring." (March 17, 2021)

 

The last earthquake in the South Sandwich Islands of M>=5.1 was an M 6.0 on March 14. Forecast 132563 had expected today's activity at the end of March. Only one quake of M>6.0 has occurred in the South Sandwich Islands in the past year - an M 6.4 on July 26, 2020.

 

O:  1APR2021 22:02:14  59.5S   26.2W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 25MAR2021 132563    60.0S   26.0W 4.0-5.8 CAAAA  So. Sandwich Islands       

P: 28MAR2021 132563    61.0S   26.0W 4.0-5.6 BBAAA  Southern  Ocean            

 

An unusual earthquake of M 3.0 occurred today on the border between northern Louisiana and Texas. NEIC reported it was felt with maximum intensity V in Plain Dealing, Louisiana and II-III in Louisiana at Mooringsport, Shreveport, Bossier City, Stonewall, Haughton, and in Texas at Daingerfield and Kilgore. An area about 100 km south of this in Louisiana was active from May, 2012 to January, 2019, but the last event within about 100 km of this epicenter with M>=4 appears to have been an M 3.0 20 years ago on March 3, 2001. Forecast 132698 had expected regional seismic enhancement in early April, 2021.

 

O:  1APR2021 07:26:25  32.6N   94.0W mb=3.0  EMSC   LOUISIANA                    

P:  2APR2021 132698    34.0N   93.0W 2.0-4.1 ABAAA  Southeast U.S.             

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in western

Texas.  NEIC reported this earthquake of M 3.9-4.0 in Western Texas was felt with intensity II-III in the area(s) of Las Cruces, New Mexico. A foreshock of M 2.7 was reported with intensity II in Carlsbad, New Mexico.  This appears to be the strongest aftershock to date of the M 4.5 which hit this area on March 17. Forecast 132409 had expected today's activity within about 50 km was likely at the end of March. This epicenter is at 101 degrees from the M 8.1 in the Northern Kermadec Islands of March 4 and was probably promoted by energy from that source.

 

O: 01APR2021 19:49:55  31.7N  104.4W ML=4.0  EMSC   WESTERN TEXAS

O:  1APR2021 07:38:42  31.7N  104.4W ML=2.6  EMSC   WESTERN TEXAS                

P: 25MAR2021 132409    32.2N  104.1W 2.0-4.1 CAAAA  SW U.S.A                   

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O:  2APR2021 05:50:56  22.5N  121.1E ML=4.0  TAI    Hualien, Taiwan              

P: 30MAR2021 132370    22.0N  122.0E 4.0-5.6 BAAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity III in Taitung and I in Pingtung Counties, Taiwan.

 

O: 01APR2021 12:04:52  37.6N   70.5E mb=4.3  EMSC   HINDU KUSH REGION, AFGHANISTAN

O:  1APR2021 16:51:09  36.7N   70.9E mb=4.1  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 26MAR2021 132388    37.0N   70.0E 3.8-5.5 CAAAA  Hindu Kush/Pakistan        

 

O:  1APR2021 19:20:07  40.9N   79.1E mb=4.7  EMSC   SOUTHERN XINJIANG, CHINA     

P: 29MAR2021 132447    40.0N   78.0E 4.0-5.4 AAAAA  Kirgizstan/Xinjiang        

 

INDONESIA AND PHILIPPINES

 

O:  1APR2021 08:58:19   0.1S  122.9E mb=4.4  EMSC   SULAWESI, INDONESIA          

P: 31MAR2021 132329     1.0S  122.0E 4.0-5.4 AAAAA  Sulawesi area              

 

O:  1APR2021 13:55:09   1.8N  127.3E mb=4.6  EMSC   HALMAHERA, INDONESIA         

P: 28MAR2021 132307     2.0N  127.0E 4.0-5.6 BAAAA  Halmahera                  

 

O: 01APR2021 12:44:53   4.4N  127.5E ML=4.3  EMSC   KEPULAUAN TALAUD, INDONESIA

O:  1APR2021 10:12:24   3.7N  126.8E mb=5.4  EMSC   KEPULAUAN TALAUD, INDONESIA  

P: 24MAR2021 132309     2.0N  126.0E 4.0-5.6 CBAAA  Mindanao, Philippines      

 

O:  1APR2021 22:51:35   7.2S  129.4E mb=4.3  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 30MAR2021 132313     7.0S  129.0E 4.0-5.4 AAAAA  Banda Sea                  

 

CENTRAL AND SOUTH AMERICA

 

O:  1APR2021 10:50:14  13.9S   72.7W ML=4.3  EMSC   CENTRAL PERU                 

P: 25MAR2021 132513    15.0S   71.0W 4.0-6.1 CABAA  Central Peru               

 

O:  1APR2021 17:06:47  15.1N   93.1W ML=4.1  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 28MAR2021 132342    14.0N   92.0W 3.5-5.3 BBBAA  Guatemala                  

 

O:  1APR2021 08:35:32  15.2N   94.6W ML=4.0  EMSC   OFF COAST OF OAXACA, MEXICO  

P: 31MAR2021 132339    17.0N   95.0W 3.5-5.3 ABAAA  Chiapas, Mexico            

 

O:  1APR2021 13:03:11  15.9N   98.2W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 30MAR2021 132353    17.0N   98.0W 3.5-5.3 ABAAA  Oaxaca, Mexico             

 

O: 02APR2021 04:19:23  19.0N   69.1W ML=3.3  EMSC   DOMINICAN REPUBLIC REGION

O:  1APR2021 18:40:57  18.6N   69.1W ML=3.0  EMSC   DOMINICAN REPUBLIC           

O:  2APR2021 02:50:34  20.3N   70.9W ML=3.2  EMSC   DOMINICAN REPUBLIC REGION    

P: 26MAR2021 132354    19.0N   71.0W 3.4-5.3 CAAAA  Puerto Rico                

 

O:  2APR2021 02:56:15  20.9S   69.3W mb=4.2  EMSC   TARAPACA, CHILE              

P: 29MAR2021 132538    20.0S   70.0W 4.0-5.4 BAAAA  So. Peru/Bolivia           

 

NEIC reported this earthquake of M 4.2 in Northern Chile was felt with intensity II-III in the area(s) of Northern Chile at Iquique, Tarapaca.

 

O:  2APR2021 05:47:47  33.2S   67.3W ML=4.1  EMSC   MENDOZA, ARGENTINA           

P: 29MAR2021 132541    32.0S   70.0W 4.0-5.6 BBBAA  Central Chile              

 

O:  2APR2021 03:42:41  34.7S   71.0W mb=4.4  EMSC   LIBERTADOR O'HIGGINS, CHILE  

P:  3APR2021 132813    34.0S   71.0W 4.0-5.8 AAAAA  Central Chile              

P: 25MAR2021 132542    35.0S   73.0W 4.0-6.0 CABAA  Central Chile              

 

NEIC reported this earthquake of M 4.4 in O'Higgins, Chile was felt with intensity II-III in the area(s) of O'Higgins, Chile at San Vicente and in Curico, Maule.

 

 

AFRICA AND EUROPE

 

O:  1APR2021 12:33:40  36.2N   26.5E ML=4.4  EMSC   DODECANESE ISLANDS, GREECE   

P: 29MAR2021 132372    36.0N   27.0E 3.0-4.8 AAAAA  Aegean Sea                 

 

O:  1APR2021 14:33:35  36.5N    7.2E mb=4.8  EMSC   NORTHERN ALGERIA             

P:  2APR2021 132707    37.0N    7.0E 3.0-4.5 AAAAA  Western Mediterranean      

P: 24MAR2021 132434    37.0N    5.0E 3.0-4.6 CABAA  Western Mediterranean      

 

NEIC reported this earthquake of M 4.8 in Algeria was felt with intensity II-III in the area(s) of Algeria with intensity VII in Qalmah, V in Wed-Zenati, IV in Heliopolis and III in Bona, Annabah. It is not likely a classical aftershock of the strong quake in Algeria in March as it occurred several hundred km to the east of that epicenter.

 

O:  1APR2021 20:11:30  66.6N   17.8W ML=3.8  EMSC   ICELAND REGION               

O: 01APR2021 20:24:08  66.6N   17.9W ML=3.4  EMSC   ICELAND REGION

 

SOUTHWEST PACIFIC

 

O:  2APR2021 03:06:34  16.2S  168.1E mb=4.6  EMSC   VANUATU                      

P:  3APR2021 132796    17.0S  168.0E 4.0-5.5 AAAAA  Vanuatu Islands            

P: 23MAR2021 132527    17.0S  168.0E 4.0-5.6 CAAAA  Vanuatu Islands            

 

O:  1APR2021 15:11:18  21.9S  179.3W Mw=6.0  EMSC   FIJI REGION                  

P:  1APR2021 132809    20.0S  179.0W 4.0-5.5 ABAAA  Tonga Islands              

P: 27MAR2021 132540    23.0S  177.0W 4.0-5.6 ABBAA  Tonga Islands              

 

OCEAN RIDGES

 

O:  1APR2021 18:03:05   7.9S   67.6E mb=4.6  EMSC   MID-INDIAN RIDGE             

 

O:  1APR2021 22:02:14  59.5S   26.2W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 25MAR2021 132563    60.0S   26.0W 4.0-5.8 CAAAA  So. Sandwich Islands       

P: 28MAR2021 132563    61.0S   26.0W 4.0-5.6 BBAAA  Southern  Ocean            

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  2APR2021 04:36:51  29.6S  177.0W mb=5.1  EMSC   KERMADEC ISLANDS REGION      

P: 29MAR2021 132533    29.0S  177.0W 4.0-5.4 BAAAA  No. Kermadec Islands       

 

O:  1APR2021 09:56:36  30.0S  177.7W Mw=6.3  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 01APR2021 11:58:32  30.0S  176.6W mb=4.5  EMSC   KERMADEC ISLANDS REGION

O: 01APR2021 22:10:14  30.0S  177.4W Mw=5.6  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  2APR2021 132819    30.0S  179.0W 4.0-5.9 AAAAA  No. Kermadec Islands       

P: 29MAR2021 132546    30.0S  178.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

O:  1APR2021 21:16:42  35.6S  179.6E ML=3.9  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 25MAR2021 132547    35.0S  179.0E 3.0-4.5 CAAAA  North Island, N.Z.         

 

O:  1APR2021 22:12:05  37.8S  178.2E ML=3.7  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 27MAR2021 132548    37.0S  178.0E 3.0-4.9 BAAAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

No earthquakes of M>=4 were located in Japan or the Kuril Islands today.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O:  1APR2021 15:18:38  32.4N  115.2W Ml=2.6  EMSC   BAJA CALIFORNIA, MEXICO      

O:  1APR2021 20:45:22  32.8N  116.1W Ml=2.9  EMSC   SOUTHERN CALIFORNIA          

P: 29MAR2021 132411    32.5N  115.7W 2.5-4.4 AAAAA  So. California             

 

O: 02APR2021 02:52:14  33.1N  115.7W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O:  2APR2021 04:15:18  33.5N  116.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA          

P:  4APR2021 132690    33.7N  116.1W 2.5-4.5 AAAAA  So. California             

 

O:  1APR2021 12:52:52  34.1N  118.1W ML=2.8  EMSC   GREATER LOS ANGELES AREA, CALI

P: 29MAR2021 132415    34.0N  118.7W 2.5-4.6 AAAAA  So. California             

 

NEIC reported this earthquake of M 3.0 in Los Angeles, California was felt with intensity IV in the area(s) of Huntington Park and Maywood, Los Angeles, California.

 

O: 01APR2021 18:02:19  36.1N  117.8W Ml=2.3  EMSC   CENTRAL CALIFORNIA

O:  1APR2021 09:50:42  36.0N  117.5W Ml=2.1  EMSC   CENTRAL CALIFORNIA           

P: 29MAR2021 132375    36.3N  118.1W 2.5-4.8 AAAAA  California/Nevada area     

 

O:  2APR2021 04:54:30  36.1N  120.6W Md=2.3  EMSC   CENTRAL CALIFORNIA           

P: 28MAR2021 132381    36.1N  120.1W 2.5-4.9 BAAAA  Central California         

P: 29MAR2021 132382    36.4N  121.0W 2.5-4.7 BAAAA  Central California         

 

O:  1APR2021 20:16:04  36.5N  118.0W Ml=2.1  EMSC   CENTRAL CALIFORNIA           

P: 29MAR2021 132375    36.3N  118.1W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 01APR2021 19:54:54  37.8N  122.1W Md=3.0  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O:  1APR2021 16:50:34  37.7N  121.9W Md=2.1  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P:  3APR2021 132661    37.9N  122.0W 2.5-4.5 AAAAA  Central California         

 

O:  2APR2021 06:40:42  37.9N  118.6W ml=2.1  EMSC   CENTRAL CALIFORNIA           

P: 28MAR2021 132377    37.8N  118.2W 2.5-4.8 BAAAA  California/Nevada area     

 

O:  2APR2021 06:01:59  38.2N  117.9W ml=2.5  EMSC   NEVADA                       

P: 28MAR2021 132377    37.8N  118.2W 2.5-4.8 BAAAA  California/Nevada area     

 

O:  1APR2021 21:41:38  38.8N  122.7W Md=2.4  EMSC   NORTHERN CALIFORNIA           

P: 31MAR2021 132383    38.7N  122.7W 2.5-4.5 AAAAA  Central California         

 

O:  2APR2021 03:23:59  39.2N  120.1W ml=2.1  EMSC   NORTHERN CALIFORNIA          

P:  3APR2021 132656    39.3N  120.0W 2.5-4.6 AAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 2.7 in Lake Tahoe, California was felt with intensity II-III in the area(s) of Lake Tahoe, California at Camelian Bay, Tahoe Vista, Kings Beach, Olympic Valley, Tahoe, Truckee and Reno.

 

O:  1APR2021 15:22:35  40.5N  124.6W Md=2.9  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 28MAR2021 132460    40.2N  124.2W 2.5-4.4 BAAAA  Off Coast of No. Calif     

 

ALASKA

 

O:  2APR2021 02:06:17  60.1N  152.0W ML=3.4  EMSC   SOUTHERN ALASKA              

P: 25MAR2021 132500    60.1N  153.4W 3.2-4.9 CAAAA  Central Alaska             

 

O:  2APR2021 01:56:38  63.2N  151.2W ML=3.0  EMSC   CENTRAL ALASKA               

P:  7APR2021 132770    63.2N  151.4W 3.2-5.1 BAAAA  Central Alaska             

P: 25MAR2021 132503    63.2N  151.4W 3.2-5.0 CAAAA  Central Alaska             

 

O:  1APR2021 17:09:12  63.4N  147.7W ML=3.5  EMSC   CENTRAL ALASKA               

P: 29MAR2021 132499    60.6N  147.6W 3.2-5.3 AAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  1APR2021 10:35:20  44.3N  124.5W Ml=2.0  EMSC   OFFSHORE OREGON              

P: 22MAR2021 132461    42.5N  126.8W 3.0-4.8 CBBAA  Off Coast of Oregon        

 

ROCKY MOUNTAINS REGION

 

O: 01APR2021 19:49:55  31.7N  104.4W ML=4.0  EMSC   WESTERN TEXAS

O:  1APR2021 07:38:42  31.7N  104.4W ML=2.6  EMSC   WESTERN TEXAS                

P: 25MAR2021 132409    32.2N  104.1W 2.0-4.1 CAAAA  SW U.S.A                   

 

O: 02APR2021 02:31:48  38.3N  113.1W Ml=2.3  EMSC   UTAH

O: 01APR2021 11:37:01  38.4N  113.1W Ml=2.1  EMSC   UTAH

O: 01APR2021 12:33:35  38.4N  113.1W Ml=2.1  EMSC   UTAH

O:  1APR2021 09:07:43  38.3N  113.1W Ml=2.4  EMSC   UTAH                         

P: 29MAR2021 132432    38.7N  112.6W 2.0-3.9 AAAAA  Utah area                  

 

O:  1APR2021 14:29:16  44.4N  115.2W Ml=2.9  EMSC   SOUTHERN IDAHO               

P: 27MAR2021 132451    44.5N  114.7W 2.0-4.3 BAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

 

O:  1APR2021 07:26:25  32.6N   94.0W mb=3.0  EMSC   LOUISIANA                    

P:  2APR2021 132698    34.0N   93.0W 2.0-4.1 ABAAA  Southeast U.S.             

 

O: 02APR2021 05:26:17  34.4N   97.4W mb=2.7  EMSC   OKLAHOMA

O:  1APR2021 11:07:44  34.4N   97.6W ML=2.9  EMSC   OKLAHOMA                     

P:  2APR2021 132699    35.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

NEIC reported this earthquake of M 2.7 in Southern Oklahoma was felt with intensity II-III in the area(s) of Southern Oklahoma at Duncan.

The other  earthquake of M 2.9 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma at Purcell.

 

O:  1APR2021 23:59:42  36.4N   89.5W Md=2.1  EMSC   SOUTHEASTERN MISSOURI        

P: 27MAR2021 132396    36.7N   89.7W 2.0-3.9 BAAAA  New Madrid area            

 

O:  2APR2021 05:39:35  37.6N   97.2W mb=2.1  EMSC   KANSAS                       

P: 26MAR2021 132427    37.0N   98.0W 2.0-4.2 CAAAA  Southern Plains            

 

O:  1APR2021 06:28:10  47.0N   66.6W MB=2.1  ECAN Plaster Rock, NB               

P: 27MAR2021 132448    47.0N   69.0W 2.0-4.0 ABAAA  Maine                       

 

O:  1APR2021 02:38:30  48.8N   67.3W MB=2.3  ECAN Matane, QC                     

P: 31MAR2021 132442    49.0N   66.0W 2.0-3.9 AAAAA  E. of Maine                

 

O:  1APR2021 01:48:56  49.0N   92.3W MB=1.3  ECAN Atikokan, ON                    

O: 01APR2021 03:48:21  49.0N   92.2W MB=1.0  ECAN Atikokan, ON    

O: 01APR2021 03:46:48  49.1N   92.2W MB=1.5  ECAN Atikokan, ON    

 

O: 31MAR2021 19:06:57  50.3N   66.2W MB=2.5  ECAN Sept-Iles, QC                  

P: 31MAR2021 132442    49.0N   66.0W 2.0-3.9 ABAAA  E. of Maine                

 

O: 31MAR2021 04:20:06  45.7N   73.0W MB=2.1  ECAN Saint-Hyacinthe, QC            

P: 27MAR2021 132455    44.0N   73.0W 2.0-4.1 BBAAA  New England                

 

HAWAII

 

O: 01APR2021 17:53:05  19.2N  155.6W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O:  1APR2021 11:02:09  19.4N  155.6W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 25MAR2021 132360    19.4N  155.1W 4.0-5.5 CABAA  Hawaii area                

 

NEIC reported this earthquake of M 3.2 in Hawaii was felt with intensity II-III in the area(s) of Hawaii at Pahala, Naalehu, Captain Cook, Hilo and Pearl City. An earlier M 3.1 was felt with intensity II in Captain Cook, Hawaii.

 

UNUSUALLY LARGE QUAKE SHAKES BAJA CALIFORNIA

 

EARTHQUAKE SUMMARY FOR  MARCH 31, 2021

 

The strongest earthquake in the U.S. or California today was an M 4.8 in Baja California. NEIC reported this earthquake was felt with intensity IV in Baja California at Delta, Tecolotes and in Somerton, Arizona with IV. Lesser shaking of intensity II-III was felt in Baja California at Reacomodo, Puebla, Mexical, Progreso, and in California at Heber and Calexico. It was followed by a series of light aftershocks. It occurred within about an hour of local solar midnight and was probably promoted by high tidal stresses with the full moon which maximize near this hour. The only event within about 100 km of this epicenter in the past four years of significantly larger magnitude was an M 5.2 on June 10, 2016 and prior to that an M 5.5 on August 25, 2012. Events of M 4.8-4.9

also occurred in the area on October 1, 2020 and November 19, 2018. Forecast 132410 had expected today's event was likely within about 50 km around March 29.

 

O: 31MAR2021 09:34:50  32.4N  115.2W Ml=2.2  EMSC   BAJA CALIFORNIA, MEXICO

O: 31MAR2021 09:38:54  32.4N  115.3W ML=2.7  EMSC   BAJA CALIFORNIA, MEXICO

O: 31MAR2021 17:53:32  32.4N  115.2W Ml=2.5  EMSC   BAJA CALIFORNIA, MEXICO

O: 31MAR2021 18:42:18  32.4N  115.2W Ml=3.0  EMSC   BAJA CALIFORNIA, MEXICO

O: 31MAR2021 07:38:18  33.2N  115.7W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 31MAR2021 08:56:24  32.3N  115.3W mb=4.3  EMSC   BAJA CALIFORNIA, MEXICO      

O: 31MAR2021 08:56:25  32.3N  115.3W mb=4.8  ANSS   BAJA CALIFORNIA, MEXICO      

P: 29MAR2021 132410    32.4N  115.8W 2.5-4.5 AAAAA  So. California             

 

The strongest seismicity in the world today occurred in Ocean Ridge areas. These included an M 5.1 in the Owen Fracture Zone south of Iran; an M 4.7 in the Mid-Indian Ridge and the strongest - an M 5.2 in the Ascension Island region of the central Atlantic. None of these were reported felt in these remote areas. Two earthquakes of M 5.2 each have occurred in the Owen Fracture Zone in the past year - on December 28, 2020 and on August 25, 2020. Today's event had been expected in late March within about 50 km of today's epicenter.

 

O: 31MAR2021 19:16:23  14.5N   56.3E mb=5.1  EMSC   OWEN FRACTURE ZONE REGION    

P: 23MAR2021 132335    15.0N   56.0E 3.5-5.2 CAAAA  Arabian Sea                

 

The last earthquake in the Mid-Indian Ridge within about 200 km of today's epicenter with M>=4.7 occurred on November 28, 2020 with M 5.4. The only other such events in the area in the past year were an M 4.9 and 5.6 on May 23, 2020.  

Forecast 132519 had expected today's event was likely within about 10 km around March 31. This epicenter is at 103 degrees from the M 8.1 in the Kermadec Islands of March 4 and was probably promoted by energy from that source.

 

O: 31MAR2021 11:46:47  16.9S   67.0E mb=4.7  EMSC   MID-INDIAN RIDGE             

P: 31MAR2021 132519    17.0S   67.0E 4.0-5.4 AAAAA  So. Indian Ocean           

 

The last earthquake of M>=5.2 in the Ascension Island area with greater magnitude than today's M 5.2 was an M 5.9-6.0 on August 22, 2020. The area was active from June to August 2020, but has not seen any moderate seismicity since that time. Forecast 132324 had expected today's activity north of Ascension Island was likely around March 28. This epicenter is at 144 degrees from the quakes in Honshu, Japan and was probably promoted by energy from those sources.

 

O: 31MAR2021 10:09:00   6.6S   12.6W mb=5.2  EMSC   ASCENSION ISLAND REGION      

P: 28MAR2021 132324     5.0S   12.0W 4.0-5.6 BBAAA  No. of Ascension Isl       

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 31MAR2021 20:34:23  33.2N   47.2E mb=4.3  EMSC   WESTERN IRAN                 

P: 31MAR2021 132423    33.0N   48.0E 3.8-5.4 AAAAA  So. Iran                   

 

O: 31MAR2021 18:32:45  39.2N   71.5E mb=4.0  EMSC   TAJIKISTAN                   

P: 27MAR2021 132388    38.0N   73.0E 3.8-5.6 ABBAA  Hindu Kush/Pakistan        

 

No significant (M>=5) or unusual earthquakes were reported in Asia today.

 

INDONESIA AND PHILIPPINES

 

O: 31MAR2021 16:13:49   0.1S  124.4E ML=4.2  EMSC   MOLUCCA SEA                  

P: 31MAR2021 132329     1.0S  122.0E 4.0-5.4 AACAA  Sulawesi area              

 

O: 31MAR2021 16:51:05   5.7N  126.0E ML=4.5  EMSC   MINDANAO, PHILIPPINES        

P: 25MAR2021 132308     5.0N  127.0E 4.0-5.5 AAAAA  Halmahera                  

P: 29MAR2021 132308     7.0N  127.0E 4.0-5.6 ABAAA  Halmahera                  

 

O: 31MAR2021 12:35:30   5.8S  142.5E ML=4.8  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P: 22MAR2021 132325     7.0S  144.0E 4.0-5.5 CBBAA  Papua New Guinea           

 

O:  1APR2021 00:36:33   6.0S  131.6E mb=4.7  EMSC   KEP. TANIMBAR REGION, INDONESI

P: 29MAR2021 132333     6.0S  131.0E 4.0-5.4 BAAAA  West Irian, PNG            

 

O:  1APR2021 05:00:51   8.7S  113.6E mb=4.4  EMSC   JAVA, INDONESIA              

P: 24MAR2021 132326     9.0S  111.0E 4.0-5.4 CACAA  So. of Java                

 

NEIC reported this earthquake of M 4.4 in Java, Indonesia was felt with intensity II-III in the area(s) of  Bali, Indonesia at Denpasar.

 

O: 31MAR2021 18:57:20   8.9S  116.4E ML=4.0  EMSC   LOMBOK REGION, INDONESIA      

P: 28MAR2021 132330     8.0S  117.0E 4.0-5.6 BAAAA  Sumbawa Island area        

 

O: 31MAR2021 13:11:22   9.4S  112.4E ML=4.2  EMSC   SOUTH OF JAVA, INDONESIA     

P: 24MAR2021 132326     9.0S  111.0E 4.0-5.4 CABAA  So. of Java                

 

O: 31MAR2021 08:45:38  11.7S  118.0E ML=4.2  EMSC   SOUTH OF SUMBAWA, INDONESIA  

P: 26MAR2021 132522    11.0S  116.0E 4.0-5.4 BABAA  So. of Indonesia           

 

O: 01APR2021 03:02:34  12.2N  143.8E mb=4.9  EMSC   GUAM REGION

O: 31MAR2021 21:19:53  12.1N  143.9E mb=5.2  EMSC   GUAM REGION                  

P: 26MAR2021 132355    13.0N  143.0E 4.0-5.4 BAAAA  So. Marianas/Guam          

 

 

CENTRAL AND SOUTH AMERICA

 

O:  1APR2021 01:34     19.7S   69.0W mb=4.9  GUC    Tarapaca at Alto Hospicio, Iqu

P: 29MAR2021 132538    20.0S   70.0W 4.0-5.4 AAAAA  So. Peru/Bolivia           

 

GUC reported this earthquake was felt with intensity   III in  Tarapaca at Alto Hospicio, Iquique, Pica and II in Mamina and Pozo Almonte, Chile.

 

O: 31MAR2021 11:20:36   3.0S   80.1W ML=4.0  EMSC   PERU-ECUADOR BORDER REGION   

P: 31MAR2021 132316     4.0S   80.0W 4.0-5.4 AAAAA  Ecuador                    

 

O: 31MAR2021 12:04:12   8.7S   74.6W ML=4.0  EMSC   CENTRAL PERU                 

P: 31MAR2021 132314     9.0S   75.0W 3.5-5.0 AAAAA  Brazil                     

 

O: 31MAR2021 08:31:56  14.9N   93.3W ML=4.1  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 28MAR2021 132342    14.0N   92.0W 3.5-5.3 BAAAA  Guatemala                  

 

O: 31MAR2021 17:28:04  15.4N   96.7W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 31MAR2021 21:08:17  15.4N   96.7W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 31MAR2021 10:55:05  15.8N   96.3W ML=4.0  EMSC   OAXACA, MEXICO

O: 31MAR2021 18:15:19  15.8N   95.2W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 31MAR2021 132339    17.0N   95.0W 3.5-5.3 ABAAA  Chiapas, Mexico            

 

O: 31MAR2021 07:26:08  16.3S   72.2W mb=4.9  EMSC   NEAR COAST OF SOUTHERN PERU  

P: 27MAR2021 132521    16.0S   71.0W 4.0-5.8 BAAAA  So. Peru/Bolivia           

 

NEIC reported this earthquake of M 4.9 in Central Peru was felt with intensity II-III in the area(s) of Central Peru at Mollendo and Arequipa (IV).

 

O: 31MAR2021 19:14:35  18.4N   92.9W ML=4.1  EMSC   TABASCO, MEXICO              

P: 27MAR2021 132339    17.0N   94.0W 3.5-5.6 BBAAA  Chiapas, Mexico            

 

O:  1APR2021 01:34:21  19.7S   68.8W mb=4.9  EMSC   TARAPACA, CHILE              

P: 29MAR2021 132538    20.0S   70.0W 4.0-5.4 AAAAA  So. Peru/Bolivia           

 

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

 

O: 31MAR2021 16:09:43  36.7S   71.0W Mw=4.5  EMSC   NEUQUEN, ARGENTINA           

P: 27MAR2021 132542    37.0S   74.0W 4.0-5.5 BABAA  Central Chile              

 

NEIC reported this earthquake of M 4.5 in Neuquen, Argentina  was felt with intensity II-III in the area(s) of  Neuquen, Argentina at Los Angeles, Biobio Chile.

 

 

AFRICA AND EUROPE

 

 

O:  1APR2021 06:55:51  42.7N   16.2E ML=4.0  EMSC   ADRIATIC SEA                  

P: 27MAR2021 132445    44.0N   16.0E 3.0-5.1 BAAAA  Italy                      

 

SOUTHWEST PACIFIC

 

O: 31MAR2021 11:38:49  18.0S  178.0W mb=4.5  EMSC   FIJI REGION                  

O: 31MAR2021 17:39:49  18.5S  177.5W mb=4.6  EMSC   FIJI REGION                  

P: 27MAR2021 132525    19.0S  178.0W 4.0-5.8 BAAAA  Tonga Islands              

 

O: 31MAR2021 22:29:00  23.1S  172.2E mb=4.7  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 30MAR2021 132531    23.0S  172.0E 4.0-5.4 AAAAA  Loyalty Islands             

 

No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.

 

OCEAN RIDGES

 

O: 31MAR2021 19:16:23  14.5N   56.3E mb=5.1  EMSC   OWEN FRACTURE ZONE REGION    

P: 23MAR2021 132335    15.0N   56.0E 3.5-5.2 CAAAA  Arabian Sea                

 

O: 31MAR2021 11:46:47  16.9S   67.0E mb=4.7  EMSC   MID-INDIAN RIDGE             

P: 31MAR2021 132519    17.0S   67.0E 4.0-5.4 AAAAA  So. Indian Ocean           

 

O: 31MAR2021 10:09:00   6.6S   12.6W mb=5.2  EMSC   ASCENSION ISLAND REGION      

P: 28MAR2021 132324     5.0S   12.0W 4.0-5.6 BBAAA  No. of Ascension Isl       

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 31MAR2021 23:51:11  32.1S  179.6E ML=4.3  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 25MAR2021 132547    35.0S  179.0E 3.0-4.5 CCAAA  North Island, N.Z.         

 

O: 31MAR2021 18:57:43  35.1S  179.7E ML=3.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 25MAR2021 132547    35.0S  179.0E 3.0-4.5 CAAAA  North Island, N.Z.         

 

O: 31MAR2021 20:17:18  37.1S  179.3E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 26MAR2021 132549    38.0S  178.0E 3.0-4.4 BAAAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

O:  1APR2021 05:07:51  22.3N  144.2E mb=4.6  EMSC   VOLCANO ISLANDS, JAPAN REGION

P: 27MAR2021 132371    24.0N  143.0E 4.0-5.4 BBAAA  Volcano Islands            

 

O:  1APR2021 04:30:04  41.6N  142.0E mb=4.8  EMSC   HOKKAIDO, JAPAN REGION       

P: 22MAR2021 132444    41.0N  142.0E 3.5-5.6 CAAAA  Hokkaido, Japan            

 

NEIC reported this earthquake of M 4.8 in Hokkaido, Japan was felt with intensity II-III in the area(s) of Hokkaido, Japan.

 

O:  1APR2021 03:17:51  45.6N  143.3E mb=4.1  EMSC   HOKKAIDO, JAPAN REGION       

P: 29MAR2021 132444    44.0N  142.0E 3.5-5.6 ABAAA  Hokkaido, Japan             

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 31MAR2021 09:34:50  32.4N  115.2W Ml=2.2  EMSC   BAJA CALIFORNIA, MEXICO

O: 31MAR2021 09:38:54  32.4N  115.3W ML=2.7  EMSC   BAJA CALIFORNIA, MEXICO

O: 31MAR2021 17:53:32  32.4N  115.2W Ml=2.5  EMSC   BAJA CALIFORNIA, MEXICO

O: 31MAR2021 18:42:18  32.4N  115.2W Ml=3.0  EMSC   BAJA CALIFORNIA, MEXICO

O: 31MAR2021 07:38:18  33.2N  115.7W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 31MAR2021 08:56:24  32.3N  115.3W mb=4.3  EMSC   BAJA CALIFORNIA, MEXICO      

P: 29MAR2021 132410    32.4N  115.8W 2.5-4.5 AAAAA  So. California             

 

O: 31MAR2021 23:56:35  36.0N  119.9W Md=2.3  EMSC   CENTRAL CALIFORNIA           

P: 28MAR2021 132381    36.1N  120.1W 2.5-4.9 BAAAA  Central California         

 

O: 01APR2021 01:58:05  36.8N  121.5W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 31MAR2021 13:44:03  36.8N  121.5W Ml=3.3  EMSC   CENTRAL CALIFORNIA

O:  1APR2021 01:14:41  36.8N  121.5W Md=2.5  EMSC   CENTRAL CALIFORNIA           

P: 29MAR2021 132382    36.4N  121.0W 2.5-4.7 BAAAA  Central California         

 

NEIC reported this earthquake of M 2.5 in Marina California was felt with intensity II-III in the area(s) of Marina California. The M 3.3 was felt with intensity II-III in Sna Juan Bautista, Salinas, Aromas, Castroville, Gilroy and Hollister.

 

O: 31MAR2021 22:34:13  37.0N  118.5W Md=2.3  EMSC   CENTRAL CALIFORNIA           

P: 28MAR2021 132377    37.8N  118.2W 2.5-4.8 BAAAA  California/Nevada area     

 

O: 31MAR2021 15:58:02  38.2N  118.1W ml=2.1  EMSC   NEVADA

O: 31MAR2021 15:58:02  38.2N  118.1W ml=2.1  EMSC   NEVADA

O: 31MAR2021 18:30:49  38.2N  117.9W ML=2.2  EMSC   NEVADA

O: 31MAR2021 19:44:10  38.2N  118.1W ml=2.2  EMSC   NEVADA

O: 31MAR2021 20:24:26  38.2N  117.9W ML=3.2  EMSC   NEVADA

O: 31MAR2021 12:04:08  38.2N  117.9W ml=2.0  EMSC   NEVADA                       

P: 28MAR2021 132377    37.8N  118.2W 2.5-4.8 BAAAA  California/Nevada area     

 

O:  1APR2021 01:09:16  39.8N  120.7W Md=2.3  EMSC   NORTHERN CALIFORNIA          

P: 28MAR2021 132458    40.6N  121.4W 2.5-4.6 BAAAA  Northern California        

 

O:  1APR2021 06:03:38  40.5N  122.0W ML=2.8  EMSC   NORTHERN CALIFORNIA          

P: 26MAR2021 132458    40.4N  122.2W 2.5-4.6 CAAAA  Northern California        

 

O: 31MAR2021 21:14:07  40.5N  124.2W Md=2.2  EMSC   NORTHERN CALIFORNIA          

O: 31MAR2021 12:14:47  41.3N  123.9W Ml=2.9  EMSC   NORTHERN CALIFORNIA          

P: 28MAR2021 132460    40.2N  124.2W 2.5-4.4 BBAAA  Off Coast of No. Calif     

 

NEIC reported this earthquake of M 3.0 in Northern California was felt with intensity II-III in the area(s) of Northern California in Millville, Palo Cedro, Shingletown, Anderson, Redding, Whitmore, Shasta Lake and Cottonwood.

The M 2.9 further to the west was felt with intensity II in Crescent City, California.

 

 

ALASKA

 

No events of M>=3 were located in Alaska today.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 31MAR2021 21:17:05  44.1N  120.8W Ml=2.3  EMSC   OREGON                       

P: 26MAR2021 132464    45.3N  121.7W 2.0-4.0 BBAAA  Oregon state, U.S.         

 

O: 31MAR2021 15:47:35  48.9N  122.2W ML=2.2  EMSC   WASHINGTON                   

P: 23MAR2021 132473    48.0N  123.0W 2.0-4.1 CAAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O: 31MAR2021 19:30:00  31.7N  104.4W ML=2.5  EMSC   WESTERN TEXAS

O: 31MAR2021 14:15:24  31.7N  104.4W ML=3.0  EMSC   WESTERN TEXAS                

P: 25MAR2021 132409    32.2N  104.1W 2.0-4.1 CAAAA  SW U.S.A                   

 

O: 31MAR2021 11:56:08  44.5N  115.2W Ml=2.2  EMSC   SOUTHERN IDAHO

O: 31MAR2021 09:21:24  44.5N  115.2W Ml=2.5  EMSC   SOUTHERN IDAHO               

P: 27MAR2021 132451    44.5N  114.7W 2.0-4.3 BAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 01APR2021 02:19:35  29.1N   97.6W mb=2.5  EMSC   SOUTHERN TEXAS

 

O: 31MAR2021 04:20:06  45.7N   73.0W MB=2.1  ECAN Saint-Hyacinthe, QC            

P: 27MAR2021 132455    44.0N   73.0W 2.0-4.1 BBAAA  New England                

 

O: 30MAR2021 22:46:06  47.7N   69.8W MB=1.4  ECAN Charlevoix Seismic Zone        

P: 30MAR2021 132455    47.3N   70.5W 2.0-3.9 AAAAA  New England                

 

HAWAII

 

No earthquakes of M>=3 were located in Hawaii.

 

 

 

 

ENHANCED SEISMICITY RELATED TO FULL MOON TIDES

 

EARTHQUAKE SUMMARY FOR  MARCH 30, 2021

 

The strongest activity in the world today occurred near the longitudes of maximum tidal stress with the full moon as previously defined in this summary:

 

"The full moon arrived on March 28, 2021 at 18:48 UT.  Longitudes which were at sub-solar conditions at this time area near 102 West and  anti-solar (local solar midnight) at 78 East longitude. These include in the West regions of the Rocky Mountains and western North America and in the east Afghanistan, Tajikistan, Xinjiang, China and Central Asia. These areas may see enhanced seismicity due to tidal effects over the next week. Seismicity may shift to times closer to local solar noon and midnight during this period, and a moderately large earthquake is possible at this time due to tidal triggering." (March 25-30, 2021)

 

The strongest earthquake in the world today occurred at 105 West longitude in the southern East Pacific Rise near the longitude of maximum tidal stress with this full moon. It occurred near local solar noon and was probably promoted by enhanced tidal stresses which maximize near this hour. The last earthquake of M>=5.8 in this region of the east Pacific was an M 5.8 on September 27, 2019 and before that an M 5.8 on March 17, 2012. The last of significantly larger magnitude in this region was an M 6.5 on June 10, 1997. Forecast 132543 had expected regional seismic enhancement around March 31.

 

O: 30MAR2021 21:35:48  35.4S  106.0W Mw=5.8  EMSC   SOUTHERN EAST PACIFIC RISE   

P: 31MAR2021 132543    36.0S   97.0W 4.0-5.4 ACAAA  Chile Rise                 

 

A moderately strong quake of M 5.7-5.8 also occurred in Western Xizang, China.

CENC reported this was lightly felt in the epicentral area and was M 5.8. At 87 East longitude this is near the longitude of highest tidal stress with this full moon (see above). An M 6.3 hit about 150 km southwest of this on July 22, 2020 and an M 7.5 occurred on November 8, 1997. The last of closer location of M>=5.7 was an M 5.7-5.9 on March 5, 2001. Forecast 132435 had expected regional enhanced seismicity in Xizang south of this around March 29. Note also that this epicenter is nearly antipodal the the M 5.8 today in the Southern East Pacific Rise.

 

O: 29MAR2021 17:27:26  34.3N   87.7E Mw=5.7  EMSC   WESTERN XIZANG               

O: 29MAR2021 17:27:24  34.4N   87.7E Mw=5.8  CENC   WESTERN XIZANG               

P: 29MAR2021 132435    31.0N   88.0E 3.8-5.3 ACAAA  Xizang                     

 

 

Seismicity was also enhanced in the western U.S. today where a series of light earthquakes in Utah were joined by an M 4.7 off Northern California and an M 4.4 in eastern Nevada near Mina. The strongest earthquake in the U.S. or Canada today was an M 4.7 off the coast of northern California. NEIC reported it was lightly felt in California at Eureka, McKinleyville. This is the strongest earthquake off the coast of Northern California since an M 4.8 more than a year ago on March 22, 2020 - an aftershocks of an M 5.8 on March 9, 2020. Forecast 132459 had expected today's event within about 25 km of this epicenter was likely around March 28.

 

O: 30MAR2021 15:51:15  40.3N  125.6W Mw=4.7  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 28MAR2021 132459    40.5N  125.8W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

An M 4.4 also occurred in the region of Mina, Nevada. It occurred about 15 minutes after the M 4.7 off northern California and may have been triggered by energy from that event. NEIC reported this earthquake  was felt with intensity II-III in the area(s) of  Nevada at Luning, Silverpeak, Fallon. The mainshock in this series was an M 6.5 on May 15, 2020. Today's event is the strongest aftershock in this region in the year 2021. The last of larger magnitude in the area was an M 4.7 on December 14, 2020. Forecast 132377 had expected today's activity was likely within the aftershock area around March 28.

 

O: 30MAR2021 16:04:05  38.2N  118.1W ML=4.3  EMSC   NEVADA

O: 30MAR2021 16:04:05  38.2N  118.1W ML=4.4  ANSS   NEVADA

P: 28MAR2021 132377    37.8N  118.2W 2.5-4.8 BAAAA  California/Nevada area     

 

Seismicity in Europe was also at elevated levels today. The strongest event in the region was an M 4.7 in the Adriatic Sea followed by an unusual M 4.2 in Austria. The M 4.7 is the largest aftershock to date of the event in the Adriatic Sea of M 5.5 on March 27, 2021 - the strongest in this area since an M 4.7 on December 29, 2013. An M 3.5 also occurred about 100 km southwest of the M 4.7 about 9 minutes later. The only events near this M 3.5 in the past four years was an M 4.4 on April 18, 2020 and an M 4.5 on December 6, 2015. Today's event is probably a regional aftershock of the M 5.5 on March 27, 2021 to the north.

 

NEIC reported this earthquake of M 4.7 in the Adriatic Sea was felt with intensity II-III in the area(s) of Split, Croatia and possibly in Prague, Czech Republic.

 

O: 30MAR2021 07:44:39  42.3N   15.7E ML=3.5  EMSC   ADRIATIC SEA                 

O: 30MAR2021 07:35:43  42.6N   16.1E mb=4.7  EMSC   ADRIATIC SEA                 

P: 27MAR2021 132445    44.0N   16.0E 3.0-5.1 BBAAA  Italy                      

P: 28MAR2021 132437    42.0N   19.0E 3.0-5.1 AABAA  Adriatic Sea               

 

An unusual earthquake of M 4.2 shook regions of Austria today. NEIC reported this event with maximum intensity in Rust, Burgenland, Austria and IV in Neudorfi, Gloggnitz and III in Wiener, Berndorf, Bad Voslau, Traiskirchen, Sopron, Weiner and Modilng. This is the strongest earthquake in Austria within about 150 km of this epicenter since an M 4.2 on May 7, 2009. The last of larger magnitude in the region was an M 4.4 on October 1, 2004. Forecast 132437 had expected regional activity would be enhanced following the M 5.5 in the Adriatic Sea of March 27.

 

O: 30MAR2021 16:25:00  47.8N   16.2E mb=4.2  EMSC   AUSTRIA                      

P: 25MAR2021 132437    45.0N   16.0E 3.0-4.9 BCAAA  Adriatic Sea               

 

A series of events of M 5.0, 5.0 and 5.2 occurred today in the Scotia Sea in the South Atlantic. This is a remote epicenter and these events were not reported felt. The last earthquake in the Scotia Sea within about 300 km of these epicenters was an M 5.3 on October 18, 2016. These events are probably aftershocks of the M 7.8 and M 6.8 on November 15 and 17, 2013. Forecast 132561 had expected enhanced seismicity in this area was likely at the end of March.

 

O: 31MAR2021 06:53:33  60.2S   47.1W mb=5.2  EMSC   SCOTIA SEA                   

O: 31MAR2021 06:52:03  60.3S   47.2W mb=5.0  EMSC   SCOTIA SEA

O: 31MAR2021 06:52:03  60.3S   47.2W mb=5.0  EMSC   SCOTIA SEA

P: 25MAR2021 132561    60.0S   38.0W 3.0-5.6 BACAA  So. So. America            

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 31MAR2021 01:43:38  42.3N   71.0E mb=4.5  EMSC   KYRGYZSTAN                   

P: 31MAR2021 132447    40.0N   75.0E 4.0-5.6 ACCAA  Kirgizstan/Xinjiang        

 

O: 31MAR2021 00:01:26  51.2N  100.3E Mw=5.2  EMSC   RUSSIA-MONGOLIA BORDER REGION

P: 28MAR2021 132493    51.0N   98.0E 3.0-4.4 BABAA  So. Siberia                

 

INDONESIA AND PHILIPPINES

 

O: 31MAR2021 01:16:30   1.3N  127.2E ML=4.4  EMSC   HALMAHERA, INDONESIA         

P: 28MAR2021 132307     2.0N  127.0E 4.0-5.6 BAAAA  Halmahera                  

 

O: 30MAR2021 11:51:22   2.0S  127.3E ML=4.0  EMSC   KEPULAUAN OBI, INDONESIA

O: 30MAR2021 11:30:24   2.0S  127.4E ML=4.3  EMSC   KEPULAUAN OBI, INDONESIA     

P: 31MAR2021 132315     1.0S  127.0E 4.0-5.4 AAAAA  Ceram area                 

 

O: 30MAR2021 20:44:23   6.4S  130.0E mb=4.5  EMSC   BANDA SEA                    

P: 29MAR2021 132333     6.0S  131.0E 4.0-5.4 AAAAA  West Irian, PNG            

 

O: 30MAR2021 16:56:42  12.9N  121.0E ML=4.0  EMSC   MINDORO, PHILIPPINES         

P: 28MAR2021 132345    12.0N  124.0E 3.5-5.2 AACAA  Luzon, Philippines         

 

CENTRAL AND SOUTH AMERICA

 

O: 31MAR2021 01:17:23   6.9N   73.0W mb=4.2  EMSC   NORTHERN COLOMBIA            

P: 31MAR2021 132312     9.0N   70.0W 4.0-5.6 ACCAA  Venezuela                  

 

O: 30MAR2021 19:34:30   9.9N   86.2W ML=4.4  EMSC   OFF COAST OF COSTA RICA      

P: 28MAR2021 132350    11.0N   87.0W 3.5-5.2 ABAAA  Nicaragua                  

 

O: 30MAR2021 09:17:18  10.6S   78.8W ML=4.8  EMSC   NEAR COAST OF CENTRAL PERU   

P: 28MAR2021 132323     8.0S   78.0W 4.0-5.6 ACAAA  No. Peru                   

 

O: 31MAR2021 04:41:20  14.0N   93.0W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 28MAR2021 132342    14.0N   92.0W 3.5-5.3 BAAAA  Guatemala                  

 

O: 30MAR2021 07:58:15  15.2N   94.7W ML=4.3  EMSC   OFF COAST OF OAXACA, MEXICO

O: 31MAR2021 03:57:39  15.5N   95.0W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 30MAR2021 11:20:36  16.5N   95.7W ML=4.4  EMSC   OAXACA, MEXICO               

P: 31MAR2021 132339    17.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 30MAR2021 16:45:36  17.6N   97.5W ML=4.0  EMSC   OAXACA, MEXICO               

P: 30MAR2021 132353    17.0N   98.0W 3.5-5.3 AAAAA  Oaxaca, Mexico              

 

O: 31MAR2021 01:43:17  19.1N   69.1W mb=4.1  EMSC   DOMINICAN REPUBLIC REGION

O: 31MAR2021 01:06:23  19.1N   69.0W ML=3.2  EMSC   DOMINICAN REPUBLIC REGION    

P: 26MAR2021 132354    19.0N   71.0W 3.4-5.3 BABAA  Puerto Rico                

 

NEIC reported this earthquake of M 4.1 in the Dominican Republic was felt with intensity II-III in the area(s) of the Dominican Republic with IV in Miches El Seibo and Samana (III).

 

O: 31MAR2021 06:50:28  20.6S   67.1W mb=4.6  EMSC   POTOSI, BOLIVIA               

P: 29MAR2021 132538    20.0S   70.0W 4.0-5.4 AACAA  So. Peru/Bolivia           

 

O: 30MAR2021 21:34:52  28.1S   68.1W mb=4.4  EMSC   LA RIOJA, ARGENTINA          

P: 26MAR2021 132529    28.0S   68.0W 4.0-5.4 BAAAA  Argentina                   

 

 

AFRICA AND EUROPE

 

O: 30MAR2021 07:44:39  42.3N   15.7E ML=3.5  EMSC   ADRIATIC SEA                 

O: 30MAR2021 07:35:43  42.6N   16.1E mb=4.7  EMSC   ADRIATIC SEA                 

P: 27MAR2021 132445    44.0N   16.0E 3.0-5.1 BBAAA  Italy                       

P: 28MAR2021 132437    42.0N   19.0E 3.0-5.1 AABAA  Adriatic Sea               

 

O: 30MAR2021 16:25:00  47.8N   16.2E mb=4.2  EMSC   AUSTRIA                      

P: 25MAR2021 132437    45.0N   16.0E 3.0-4.9 BCAAA  Adriatic Sea                

 

No significant (M>=5) or unusual earthquakes were reported in Europe today.

 

SOUTHWEST PACIFIC

 

O: 31MAR2021 03:59:15  20.8S  169.9E mb=4.8  EMSC   VANUATU                      

P: 23MAR2021 132527    19.0S  169.0E 4.0-5.5 CAAAA  Vanuatu Islands             

 

O: 30MAR2021 14:06:41  23.3S  172.1E mb=4.6  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 30MAR2021 132531    23.0S  172.0E 4.0-5.4 AAAAA  Loyalty Islands            

 

No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.

 

OCEAN RIDGES

 

O: 30MAR2021 13:14:11  16.5N   48.8W mb=4.8  EMSC   NORTH ATLANTIC OCEAN         

P: 27MAR2021 132349    17.0N   47.0W 4.0-5.6 BABAA  Mid-Atlantic Ridge         

 

O: 30MAR2021 21:35:48  35.4S  106.0W Mw=5.8  EMSC   SOUTHERN EAST PACIFIC RISE   

P: 31MAR2021 132543    36.0S   97.0W 4.0-5.4 ACAAA  Chile Rise                 

 

O: 30MAR2021 09:24:18  53.8S  140.4E mb=4.9  EMSC   WEST OF MACQUARIE ISLAND     

 

O: 31MAR2021 06:53:33  60.2S   47.1W mb=5.2  EMSC   SCOTIA SEA                    

O: 31MAR2021 06:52:03  60.3S   47.2W mb=5.0  EMSC   SCOTIA SEA

O: 31MAR2021 06:52:03  60.3S   47.2W mb=5.0  EMSC   SCOTIA SEA

P: 25MAR2021 132561    60.0S   38.0W 3.0-5.6 BACAA  So. So. America            

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 30MAR2021 09:24:18  53.8S  140.4E mb=4.9  EMSC   WEST OF MACQUARIE ISLAND     

 

O: 31MAR2021 04:05:57  29.2S  176.3W mb=5.1  EMSC   KERMADEC ISLANDS REGION      

P: 29MAR2021 132533    29.0S  177.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

O: 30MAR2021 08:35:05  35.8S  178.2E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 25MAR2021 132547    35.0S  179.0E 3.0-4.5 BAAAA  North Island, N.Z.         

 

O: 30MAR2021 10:02:12  37.6S  179.7E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 27MAR2021 132548    37.0S  178.0E 3.0-4.9 AABAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

O: 30MAR2021 18:08:30  35.0N  138.5E ML=4.0  EMSC   EASTERN HONSHU, JAPAN        

P: 29MAR2021 132385    34.0N  135.0E 3.5-4.9 AACAA  Central/So. Honshu Japan    

 

O: 30MAR2021 11:11:09  36.2N  142.0E mb=4.8  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 28MAR2021 132404    36.0N  141.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 30MAR2021 16:04:05  38.2N  118.1W ML=4.3  EMSC   NEVADA

O: 30MAR2021 16:07:50  38.2N  118.1W ml=2.1  EMSC   NEVADA

O: 30MAR2021 16:12:31  38.2N  118.1W ml=2.0  EMSC   NEVADA

O: 30MAR2021 16:52:55  38.2N  118.1W ml=2.2  EMSC   NEVADA

O: 30MAR2021 17:16:27  38.2N  118.1W ml=2.1  EMSC   NEVADA

O: 30MAR2021 18:08:18  38.2N  117.8W ml=2.0  EMSC   NEVADA

O: 30MAR2021 18:35:52  38.2N  118.1W ML=2.7  EMSC   NEVADA

O: 30MAR2021 22:19:55  38.2N  118.1W ml=2.4  EMSC   NEVADA

O: 30MAR2021 23:06:52  38.2N  118.1W ML=2.5  EMSC   NEVADA

O: 30MAR2021 16:21:59  38.3N  118.2W ML=2.4  EMSC   NEVADA

O: 31MAR2021 05:04:55  38.1N  117.9W ml=2.0  EMSC   NEVADA                       

P: 28MAR2021 132377    37.8N  118.2W 2.5-4.8 BAAAA  California/Nevada area     

 

O: 30MAR2021 22:30:36  33.0N  116.4W Ml=2.0  EMSC   SOUTHERN CALIFORNIA          

P: 29MAR2021 132412    32.8N  116.0W 2.5-4.4 AAAAA  So. California             

 

O: 31MAR2021 04:11:36  35.4N  118.4W Ml=2.2  EMSC   CENTRAL CALIFORNIA           

P: 26MAR2021 132419    35.0N  119.2W 2.5-5.0 BAAAA  So. California             

 

O: 31MAR2021 03:39:09  35.7N  117.6W Ml=2.4  EMSC   SOUTHERN CALIFORNIA          

P: 29MAR2021 132375    36.3N  118.1W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 30MAR2021 23:33:52  36.0N  120.9W Md=2.6  EMSC   CENTRAL CALIFORNIA            

O: 30MAR2021 10:08:37  36.0N  121.5W Md=2.0  EMSC   OFFSHORE CENTRAL CALIFORNIA  

P: 29MAR2021 132382    36.4N  121.0W 2.5-4.7 AAAAA  Central California         

 

O: 30MAR2021 11:56:55  36.1N  117.8W Ml=2.2  EMSC   CENTRAL CALIFORNIA            

P: 29MAR2021 132375    36.3N  118.1W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 30MAR2021 16:04:29  36.8N  117.9W ML=3.2  EMSC   CENTRAL CALIFORNIA           

P: 29MAR2021 132375    36.3N  118.1W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 31MAR2021 00:43:27  36.9N  121.3W Md=2.2  EMSC   CENTRAL CALIFORNIA           

P: 29MAR2021 132382    36.4N  121.0W 2.5-4.7 AAAAA  Central California         

 

O: 30MAR2021 07:14:22  37.1N  115.3W ml=2.4  EMSC   NEVADA                       

P: 29MAR2021 132379    38.7N  115.4W 2.5-4.4 ABAAA  California/Nevada area     

 

O: 30MAR2021 22:34:36  37.4N  116.2W ml=2.0  EMSC   NEVADA                       

P: 26MAR2021 132421    35.5N  116.4W 2.5-4.5 BBAAA  So. California             

 

O: 31MAR2021 05:04:55  38.1N  117.9W ml=2.0  EMSC   NEVADA                       

P: 28MAR2021 132377    37.8N  118.2W 2.5-4.8 BAAAA  California/Nevada area     

 

O: 30MAR2021 17:05:34  38.8N  122.8W ML=2.9  EMSC   NORTHERN CALIFORNIA          

P: 31MAR2021 132383    38.7N  122.7W 2.5-4.5 AAAAA  Central California         

 

NEIC reported this earthquake of M 3.1 in the Geysers, Northern California was felt with intensity II-III in the area(s) of the Geysers, Northern California at Kelseyville, Geyserville, Middletown, Hopland, Windsor.

 

O: 30MAR2021 15:51:15  40.3N  125.6W Mw=4.7  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 28MAR2021 132459    40.5N  125.8W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

 

ALASKA

 

O: 30MAR2021 12:49:21  51.2N  175.0W ml=3.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 29MAR2021 132479    51.9N  176.0W 3.5-5.3 AAAAA  Andreanoff Isls, Aleutians 

 

O: 31MAR2021 01:16:55  55.5N  158.1W mb=4.2  EMSC   ALASKA PENINSULA             

P: 29MAR2021 132477    54.7N  156.9W 3.5-5.3 AAAAA  Alaska Peninsula            

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 30MAR2021 16:47:57  50.6N  130.6W MB=3.8  ECAN Port Hardy, BC                 

P: 27MAR2021 132482    50.5N  130.4W 3.0-5.0 BAAAA  British Colombia           

 

O: 30MAR2021 18:06:53  47.8N  122.5W ML=2.6  EMSC   SEATTLE-TACOMA AREA, WASHINGTON

O: 30MAR2021 07:24:12  47.6N  122.6W Ml=2.3  EMSC   SEATTLE-TACOMA AREA, WASHINGTO

P: 26MAR2021 132473    47.5N  121.8W 2.0-4.0 BAAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O: 30MAR2021 14:59:40  38.4N  113.1W Md=2.1  EMSC   UTAH

O: 30MAR2021 19:19:54  38.3N  113.1W Ml=2.1  EMSC   UTAH                         

P: 29MAR2021 132432    38.7N  112.6W 2.0-3.9 AAAAA  Utah area                  

 

O: 30MAR2021 15:16:45  39.4N  110.3W MD=2.1  EMSC   UTAH                          

P: 27MAR2021 132433    39.7N  110.8W 2.0-3.9 BAAAA  Utah area                  

 

O: 30MAR2021 16:32:47  37.3N  112.6W ML=2.8  EMSC   UTAH                         

P: 29MAR2021 132432    38.7N  112.6W 2.0-3.9 ABAAA  Utah area                   

 

O: 30MAR2021 20:07:55  41.6N  112.3W Ml=2.2  EMSC   UTAH                         

P: 31MAR2021 132474    43.2N  111.0W 2.0-4.1 ABAAA  Yellowstone/Wyoming        

 

EASTERN U.S./CANADA

 

O: 31MAR2021 04:20:06  45.7N   73.0W MB=2.1  ECAN Saint-Hyacinthe, QC            

P: 27MAR2021 132455    44.0N   73.0W 2.0-4.1 BBAAA  New England                

 

O: 30MAR2021 22:46:06  47.7N   69.8W MB=1.4  ECAN  Charlevoix Seismic Zone       

P: 30MAR2021 132455    47.3N   70.5W 2.0-3.9 AAAAA  New England                

 

O: 30MAR2021 14:33:07  50.3N   66.2W MB=2.5  ECAN Sept-Iles, QC. Felt            

P: 31MAR2021 132442    49.0N   66.0W 2.0-3.9 ABAAA  E. of Maine                

 

O: 30MAR2021 10:17:13  57.0N   89.5W MB=2.2  ECAN Fort Severn, ON                 

P: 31MAR2021 132505    64.0N   87.0W 2.5-4.2 ACBAA  Nunavit/Hudson Bay, Canada 

 

O: 30MAR2021 13:17:55  34.4N   97.6W ML=2.0  EMSC   OKLAHOMA                     

P: 27MAR2021 132426    35.0N   96.0W 2.0-4.1 BAAAA  Southern Plains            

 

HAWAII

 

O: 30MAR2021 16:09:29  19.6N  155.5W ML=3.6  EMSC   ISLAND OF HAWAII, HAWAII     

P: 25MAR2021 132360    19.4N  155.1W 4.0-5.5 BAAAA  Hawaii area                

 

NEIC reported this earthquake of M 3.3 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Paauilo, Holualoa, Pepeekeo, Kamuela, Kailua Kona, Captain Cook, Honokaa, Waikoloa. 

 

MODERATE QUAKE IN BEAUFORT SEA LARGEST IN EXACTLY 34 YEARS

 

EARTHQUAKE SUMMARY FOR  MARCH 29, 2021

 

The strongest earthquake in the U.S. or Canada today was an M 5.1-5.3 in the Beaufort Sea in the Yukon and Nunavut, Canada. It was not reported felt in this remote area. This is the strongest earthquake in the Beaufort Sea within about 300 km of this epicenter in at least 30 years. The largest earthquake previously recorded in this area was an M 6.5 on November 16, 1920. Other earthquakes in the area of M>5.1 hit the area on July 5, 1937 (M 5.5); and March 30, 1987 (M 5.2-5.5) exactly 34 years ago today. An M 5.1 also hit the area on June 14, 1975. Forecast 132511 had expected today's event within about 150 km of today's epicenter was likely around March 30. This epicenter is near the north Geomagnetic Pole and may have been promoted by the recent strong geomagnetic storm, the largest since September, 2020 as noted in previous issues of this summary:

 

"This concludes the strongest geomagnetic storm since AP reached 32 on September 28, 2020. Geomagnetic storms such as this can help promote elevated seismicity near the geomagnetic equator and at high latitudes" (March 25, 2021)

 

This epicenter is near 106 degrees from the M 8.1 in the Kermadec Islands of March 4 and at 103 degrees from the Loyalty Islands activity of February 10, 2021 may have been promoted by energy from those sources. It is also at the seventh node (52 degrees) from Honshu Japan.

 

O: 30MAR2021 00:06:12  72.2N  133.1W MB=5.3  ECAN Baillie, NT     

O: 30MAR2021 00:06:08  72.3N  133.3W Mw=5.1  EMSC   BEAUFORT SEA                 

P: 30MAR2021 132511    71.0N  134.0W 2.5-4.0 ABAAA  Yukon Territory, Canada    

 

An unusual earthquake of M 3.0 also occurred in Quebec in the Ngava, Inukjuak area. The last earthquake of larger magnitude than M 3.0 within about 300 km of this epicenter was an M 3.9 nearly 14 years ago on September 2, 2007. Forecasts 132490 and 132497 had expected this activity within about 100 km was likely between March 27 and 31.

 

O: 29MAR2021 16:08:12  58.9N   78.0W ML=3.0  EMSC   NGAVA PENINSULA, QUEBEC, CANAD

O: 29MAR2021 16:08:12  58.9N   77.9W MB=3.0  ECAN Inukjuak, QC    

P: 27MAR2021 132490    59.0N   76.0W 2.0-4.1 AAAAA  Quebec, Canada             

P: 31MAR2021 132497    60.0N   79.0W 2.5-4.3 ABAAA  Baffin/Davis Strait Canada 

 

The strongest earthquake in the world today was an M 5.7-5.8 in Western Xizang, China. CENC reported this was lightly felt in the epicentral area and was M 5.8.

An M 6.3 hit about 150 km southwest of this on July 22, 2020 and an M 7.5 occurred on November 8, 1997. The last of closer location of M>=5.7 was an M 5.7-5.9 on March 5, 2001. Forecast 132435 had expected regional enhanced seismicity in Xizang south of this around March 29. This event which occurred within about 30 minutes of local solar midnight may have been promoted by high tidal stresses associated with the full moon. The tidal forecast in this summary had expected activity near this longitude as:

 

“The full moon arrived on March 28, 2021 at 18:48 UT.  Longitudes which were at sub-solar conditions at this time area near 102 West and  anti-solar (local solar midnight) at 78 East longitude. These include in the West regions of the Rocky Mountains and western North America and in the east Afghanistan, Tajikistan, Xinjiang, China and Central Asia. These areas may see enhanced seismicity due to tidal effects over the next week. Seismicity may shift to times closer to local solar noon and midnight during this period, and a moderately large earthquake is possible at this time due to tidal triggering.” (March 27-30, 2021)

 

 

O: 29MAR2021 17:27:26  34.3N   87.7E Mw=5.7  EMSC   WESTERN XIZANG               

O: 29MAR2021 17:27:24  34.4N   87.7E Mw=5.8  CENC   WESTERN XIZANG               

P: 29MAR2021 132435    31.0N   88.0E 3.8-5.3 ACAAA  Xizang                     

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 29MAR2021 10:45:16  26.2N   95.5E ML=3.9  EMSC   MYANMAR-INDIA BORDER REGION  

P: 27MAR2021 132363    25.0N   95.0E 4.0-5.4 ABAAA  Myanmar                    

 

O: 29MAR2021 18:49:02  28.0N   87.6E ML=3.6  EMSC   NEPAL                         

P: 22MAR2021 132365    27.0N   88.0E 3.5-5.4 CAAAA  Nepal                      

 

O: 29MAR2021 17:27:26  34.3N   87.7E Mw=5.7  EMSC   WESTERN XIZANG               

O: 29MAR2021 17:27:24  34.4N   87.7E Mw=5.8  CENC   WESTERN XIZANG                

P: 29MAR2021 132435    31.0N   88.0E 3.8-5.3 ACAAA  Xizang                     

 

O: 30MAR2021 05:04:37  46.4N  142.1E mb=4.1  EMSC   SAKHALIN, RUSSIA             

P: 29MAR2021 132444    44.0N  142.0E 3.5-5.6 ACAAA  Hokkaido, Japan            

 

O: 29MAR2021 19:41:51  54.8N  162.8E mb=4.7  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 26MAR2021 132484    54.0N  161.0E 4.0-5.6 BAAAA  E. of Kamchatka            

 

No significant (M>=5) or unusual earthquakes were reported in Asia today.

 

INDONESIA AND PHILIPPINES

 

O: 29MAR2021 09:59:14   4.6S  138.6E ML=4.3  EMSC   PAPUA, INDONESIA             

P: 26MAR2021 132332     3.0S  139.0E 4.0-5.6 BBAAA  West Irian, PNG            

 

O: 29MAR2021 20:31:53   5.5S  141.4E ML=4.7  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P: 26MAR2021 132332     3.0S  139.0E 4.0-5.6 BCCAA  West Irian, PNG            

 

O: 30MAR2021 04:32:51   7.5S  128.3E mb=4.5  EMSC   KEPULAUAN BARAT DAYA, INDONESI

P: 30MAR2021 132313     7.0S  129.0E 4.0-5.4 AAAAA  Banda Sea                  

 

O: 29MAR2021 21:08:36  13.6N  125.2E ML=4.1  EMSC   PHILIPPINE ISLANDS REGION    

P: 28MAR2021 132345    12.0N  124.0E 3.5-5.2 ABAAA  Luzon, Philippines         

 

O: 29MAR2021 19:42:54  21.3N  146.0E Mw=5.2  EMSC   MARIANA ISLANDS REGION

O: 29MAR2021 19:45:33  21.4N  145.9E mb=5.1  EMSC   MARIANA ISLANDS REGION

O: 29MAR2021 19:15:44  21.3N  146.2E mb=4.9  EMSC   MARIANA ISLANDS REGION       

P: 24MAR2021 132371    21.0N  147.0E 4.0-5.6 BAAAA  Volcano Islands            

 

CENTRAL AND SOUTH AMERICA

 

O: 30MAR2021 06:12:44   7.6S   76.3W ML=4.1  EMSC   NORTHERN PERU                

P: 28MAR2021 132323     6.0S   76.0W 4.0-5.4 ABAAA  No. Peru                   

P: 28MAR2021 132323     8.0S   78.0W 4.0-5.6 AABAA  No. Peru                   

 

O: 29MAR2021 22:16:01   8.4N   82.9W mb=4.5  EMSC   PANAMA-COSTA RICA BORDER REGION

P: 27MAR2021 132304     9.0N   84.0W 3.5-5.4 AAAAA  Costa Rica                 

 

NEIC reported this earthquake of M 4.5 in Panama/Costa Rica was felt with intensity II-III in the area(s) of Costa Rica at San Vito Puntarenas.

 

O: 29MAR2021 20:46:33  10.2N   86.0W mb=4.8  EMSC   COSTA RICA                   

P: 28MAR2021 132350    11.0N   87.0W 3.5-5.2 AAAAA  Nicaragua                  

 

NEIC reported this earthquake of M 4.8 in Costa Rica was felt with intensity II-III in the area(s) of Costa Rica with IV in Belen and Bagaces, Guanacaste and in Santa Cruz, Sardina, Samara.

 

O: 30MAR2021 00:58:28  14.8N   93.1W ML=4.2  EMSC   OFFSHORE CHIAPAS, MEXICO     

O: 29MAR2021 08:05:19  15.1N   93.8W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO

P: 28MAR2021 132342    14.0N   92.0W 3.5-5.3 AAAAA  Guatemala                  

 

O: 29MAR2021 14:38:22  15.3N   91.8W mb=4.4  EMSC   GUATEMALA                    

P: 28MAR2021 132342    14.0N   92.0W 3.5-5.3 ABAAA  Guatemala                  

 

O: 29MAR2021 10:49:49  15.8N   96.1W ML=4.0  EMSC   OAXACA, MEXICO               

P: 30MAR2021 132353    15.0N   97.0W 3.5-5.1 AAAAA  Oaxaca, Mexico             

 

O: 29MAR2021 13:42:58  16.1N   91.3W ML=4.1  EMSC   CHIAPAS, MEXICO              

P: 30MAR2021 132342    14.0N   91.0W 3.5-5.3 ACAAA  Guatemala                  

 

O: 29MAR2021 07:06:01  17.5N   94.8W ML=4.1  EMSC   VERACRUZ, MEXICO             

P: 31MAR2021 132339    17.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico             

 

O: 30MAR2021 06:23:13  18.0N   65.5W Md=3.2  EMSC   PUERTO RICO REGION

O: 30MAR2021 01:07:21  18.0N   65.4W ML=3.9  EMSC   PUERTO RICO REGION           

P: 28MAR2021 132356    20.0N   65.0W 3.0-4.6 ABAAA  Bahamas/No. Caribbean      

 

O: 29MAR2021 12:43:54  18.1N   71.5W ML=3.0  EMSC   DOMINICAN REPUBLIC           

P: 26MAR2021 132354    19.0N   71.0W 3.4-5.3 BAAAA  Puerto Rico                

 

O: 29MAR2021 18:38:18  28.4N  105.2W mb=4.0  EMSC   CHIHUAHUA, MEXICO            

O: 29MAR2021 19:40:03  28.0N  112.2W ML=3.9  EMSC   GULF OF CALIFORNIA           

P: 31MAR2021 132359    28.0N  112.0W 3.5-5.1 AAAAA  Gulf of California         

 

NEIC reported this earthquake of M 4.0 in Chihuahua, Mexico was felt with intensity II-III in the area(s) of Chichihua, Mexico.

 

AFRICA AND EUROPE

 

No significant (M>=5) or unusual earthquakes were reported in Europe today.

 

SOUTHWEST PACIFIC

 

O: 29MAR2021 17:21:04   7.2S  155.1E mb=4.8  EMSC   SOLOMON ISLANDS

O: 29MAR2021 07:43:37   7.0S  156.0E Mw=5.3  EMSC   SOLOMON ISLANDS              

P: 31MAR2021 132328     9.0S  158.0E 4.0-5.8 ABBAA  Solomon Islands            

 

OCEAN RIDGES

 

O: 30MAR2021 04:11:38  43.9N   28.9W mb=4.4  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 31MAR2021 132456    45.0N   28.0W 4.0-5.6 ABAAA  No. Mid-Atlantic Ridge     

 

No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 29MAR2021 23:32:26  29.6S  177.3W mb=4.7  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 29MAR2021 132546    30.0S  178.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

O: 29MAR2021 07:01:13  37.1S  178.9E ML=3.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 30MAR2021 04:36:34  37.2S  179.9E ML=3.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O: 30MAR2021 02:30:20  37.6S  179.9E ML=3.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

P: 27MAR2021 132548    37.0S  178.0E 3.0-4.9 AAAAA  North Island, N.Z.         

 

O: 29MAR2021 20:57:42  37.3S  180.0W ML=3.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 25MAR2021 132545    37.0S  180.0W 3.5-5.1 BAAAA  E. of North Islands N.Z.   

 

O: 30MAR2021 05:33:27  44.6S  167.4E ML=3.7  EMSC   SOUTH ISLAND OF NEW ZEALAND

O: 30MAR2021 05:16:04  44.6S  167.4E ML=4.3  EMSC   SOUTH ISLAND OF NEW ZEALAND  

P: 26MAR2021 132557    44.0S  168.0E 3.0-4.9 BAAAA  So. Island, N.Z.           

 

JAPAN AND KURIL ISLANDS

 

No earthquakes of M>=4 were located in Japan or the Kuril Islands today.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 29MAR2021 07:04:38  36.8N  120.9W Md=2.0  EMSC   CENTRAL CALIFORNIA

O: 29MAR2021 16:46:55  36.8N  121.0W Md=2.0  EMSC   CENTRAL CALIFORNIA

O: 30MAR2021 06:25:52  36.4N  121.0W Md=2.3  EMSC   CENTRAL CALIFORNIA           

O: 30MAR2021 05:43:48  37.4N  121.8W Md=2.6  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 29MAR2021 132382    36.4N  121.0W 2.5-4.7 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.6 in San Jose, California was felt with intensity II-III in the area(s) of San Jose, California.

 

O: 29MAR2021 14:11:52  39.6N  119.4W ml=2.1  EMSC   NEVADA                        

P: 23MAR2021 132380    39.1N  119.6W 2.5-4.8 CAAAA  California/Nevada area     

 

O: 29MAR2021 10:38:27  38.1N  118.0W ML=3.4  EMSC   NEVADA                       

O: 29MAR2021 18:42:00  38.2N  118.0W ml=2.0  EMSC   NEVADA

P: 28MAR2021 132377    37.8N  118.2W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 30MAR2021 06:37:38  40.0N  123.8W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P: 29MAR2021 132384    39.8N  123.5W 2.5-4.6 AAAAA  Central California         

 

ALASKA

 

O: 29MAR2021 23:49:04  52.7N  176.1W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 29MAR2021 132479    51.9N  176.0W 3.5-5.3 AAAAA  Andreanoff Isls, Aleutians 

 

O: 29MAR2021 11:05:37  56.1N  149.8W ML=3.0  EMSC   GULF OF ALASKA               

P: 25MAR2021 132499    55.1N  149.4W 3.2-5.3 BAAAA  Central Alaska             

 

O: 29MAR2021 08:25:49  63.3N  151.1W ML=3.5  EMSC   CENTRAL ALASKA               

P: 25MAR2021 132503    63.2N  151.4W 3.2-5.0 BAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 30MAR2021 00:06:12  72.2N  133.1W MB=5.3  ECAN Baillie, NT    

O: 30MAR2021 00:06:08  72.3N  133.3W Mw=5.1  EMSC   BEAUFORT SEA                 

P: 30MAR2021 132511    71.0N  134.0W 2.5-4.0 ABAAA  Yukon Territory, Canada    

 

ROCKY MOUNTAINS REGION

 

O: 29MAR2021 07:34:33  38.3N  113.1W Ml=2.0  EMSC   UTAH                         

O: 29MAR2021 23:15:51  38.3N  113.1W Ml=2.1  EMSC   UTAH

O: 29MAR2021 23:15:51  38.3N  113.1W Ml=2.1  EMSC   UTAH

O: 30MAR2021 06:36:46  38.3N  113.1W Ml=2.5  EMSC   UTAH

O: 29MAR2021 19:40:12  38.4N  113.1W ML=3.3  EMSC   UTAH

P: 29MAR2021 132432    38.7N  112.6W 2.0-3.9 AAAAA  Utah area                  

 

O: 29MAR2021 18:53:28  39.4N  110.3W MD=2.0  EMSC   UTAH                         

P: 27MAR2021 132433    39.7N  110.8W 2.0-3.9 AAAAA  Utah area                  

 

O: 30MAR2021 05:41:32  39.7N  111.6W Ml=2.1  EMSC   UTAH                         

O: 30MAR2021 05:41:32  39.7N  111.6W Ml=2.1  EMSC   UTAH

P: 31MAR2021 132433    39.7N  111.9W 2.0-4.0 AAAAA  Utah area                  

 

O: 29MAR2021 14:05:52  44.3N  115.0W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 29MAR2021 21:34:46  44.4N  115.1W ML=2.6  EMSC   SOUTHERN IDAHO

O: 29MAR2021 21:38:28  44.4N  115.2W Ml=2.0  EMSC   SOUTHERN IDAHO

O: 30MAR2021 06:55:29  44.2N  115.1W Ml=2.1  EMSC   SOUTHERN IDAHO               

P: 27MAR2021 132451    44.5N  114.7W 2.0-4.3 BAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 29MAR2021 16:08:12  58.9N   78.0W ML=3.0  EMSC   NGAVA PENINSULA, QUEBEC, CANAD

O: 29MAR2021 16:08:12  58.9N   77.9W MB=3.0  ECAN Inukjuak, QC    

P: 27MAR2021 132490    59.0N   76.0W 2.0-4.1 AAAAA  Quebec, Canada             

P: 31MAR2021 132497    60.0N   79.0W 2.5-4.3 ABAAA  Baffin/Davis Strait Canada 

 

O: 29MAR2021 01:41:49  47.4N   70.3W MB=1.4  ECAN  Charlevoix Seismic Zone       

P: 30MAR2021 132455    47.3N   70.5W 2.0-3.9 AAAAA  New England                

 

O: 28MAR2021 06:56:48  72.0N   77.4W MB=3.3  ECAN Pond Inlet, NU                 

P: 30MAR2021 132509    71.0N   75.0W 2.5-3.9 AAAAA  Baffin/Davis Strait Canada 

 

O: 29MAR2021 08:40:12  35.1N   95.4W ML=2.0  EMSC   OKLAHOMA

O: 29MAR2021 16:00:09  34.4N   97.4W ML=2.3  EMSC   OKLAHOMA                     

P: 27MAR2021 132426    35.0N   96.0W 2.0-4.1 AAAAA  Southern Plains             

 

O: 29MAR2021 15:57:08  36.0N   89.9W Md=2.0  EMSC   SOUTHEASTERN MISSOURI        

P: 27MAR2021 132396    36.7N   89.7W 2.0-3.9 AAAAA  New Madrid area            

 

HAWAII

 

O: 29MAR2021 18:13:56  18.4N  154.1W ML=3.1  EMSC   HAWAII REGION, HAWAII         

P: 25MAR2021 132360    19.4N  155.1W 4.0-5.5 AAAAA  Hawaii area                

 

 

 

 

MODERATE QUAKE SHAKES BARBADOS, WINDWARD ISLANDS

 

EARTHQUAKE SUMMARY FOR  MARCH 28, 2021

 

An earthquake of M 5.5 was felt in Barbados, Windward Islands today. NEIC reported it was felt with intensity III in Crane Saint Philip, Barbados. This is the strongest earthquake within about 300 km of this epicenter in Barbados and the Windward Islands since an M 5.8 on February 3, 2017. The only event of M>=6 in the Barbados in the past 30 years were an M 6.5 on July 16, 2015 and an M 6.5 on February 18, 2014. At the time this summary noted:

 

 

"A series of moderate to strong earthquakes hit the region of Barbados today. These began with an M 5.7, a foreshock to the strongest event of M 6.5. This second event was probably triggered by the new moon tidal stresses. This event occurred within 15 minutes of local solar noon, a maximum time for tidal stresses. This was followed minutes later by an aftershock of M 5.2. …. As these earthquakes occurred far offshore, no damage or casualties were reported or expected from these events. The last earthquake within 200 km of this epicenter with M>=6.5 occurred  as a similar M 6.5 on February 18, 2014, the only such event in the area in at least 25 years." (July 17, 2015)

 

Today's event occurred near local solar midnight and, like the event in July, 2015 occurred with a full or new moon and was likely promoted by high tidal stresses associated with today's full moon. The M 6.5 in Martinique of February 18, 2014 occurred three days after the full moon early on February 15. This epicenter is located at the third node (120 degrees) from the M 8.1 in the Kermadec Islands and from the North Island, New Zealand quake of M 7.3 on March 3 and near this distance from the events in Honshu Japan of M 7.1 and 7.2 and was probably promoted by strong seismic energy from those sources.

 

O: 29MAR2021 06:35:09  13.8N   58.5W mb=5.5  EMSC   BARBADOS REGION, WINDWARD ISL.

P: 31MAR2021 132356    10.0N   63.0W 3.4-4.9 ACCAA  Windward Islands           

 

The largest earthquake of the day was an M 5.6-5.8 in the Northern Mid-Atlantic Ridge north of the Azores Islands. It was not reported felt in this remote area. The last earthquake within about 300 km of this epicenter with M>=5.6 occurred on August 31, 2011 with M 5.6. A similar M 5.8 occurred in the area on March 20, 2021 about 400 km north of today's epicenter. A foreshock of M 4.6 hit near today's epicenter on February 3, 2021. When the event occurred on March 20, 2021 this summary commented in this regard:

 

"A strong near-antipodal pair also occurred today in the Macquarie Islands south

of Australia and in the northern mid-Atlantic Ridge with M 6.1 and 5.7 respectively. Forecast 132204 had expected the area south of this in the Northern Mid-Atlantic Ridge was likely to see elevated seismicity in mid-March. The only other such earthquake with M>=5.8 within about 200 km of this epicenter in the past 30 years was an M 5.9 on December 19, 2008." (March 20, 2021)

 

This epicenter is near 100 degrees from the recent events of M 7.1 and 7.2 off the coast of Honshu, Japan and was probably promoted by concentrated energy from  those sources.

 

 

Forecast 132456 had expected an event with magnitude up to M 5.6 was likely in the region within about 150 km of this epicenter around March 31. This event occurred near local solar midnight and may have been promoted by strong tidal stresses associated with today's full moon. The tidal forecast in this summary for this full moon had read:

 

"The full moon arrived on March 28, 2021 at 18:48 UT.  Longitudes which were at sub-solar conditions at this time area near 102 West and  anti-solar (local solar midnight) at 78 East longitude. These include in the West regions of the Rocky Mountains and western North America and in the east Afghanistan, Tajikistan, Xinjiang, China and Central Asia. These areas may see enhanced seismicity due to tidal effects over the next week. Seismicity may shift to times closer to local solar noon and midnight during this period, and a moderately large earthquake is possible at this time due to tidal triggering." (March 25-28, 2021)

 

This epicenter is at 104 degrees from the events of M 7.1 and 7.2 off Honshu, Japan of February 13 and March 20, 2021 and was probably promoted by energy from those events.

 

O: 28MAR2021 23:01:46  43.6N   28.8W mb=5.6  EMSC   NORTHERN MID-ATLANTIC RIDGE  

O: 28MAR2021 23:01:46  43.6N   28.8W mb=5.8  ANSS   NORTHERN MID-ATLANTIC RIDGE  

P: 31MAR2021 132456    45.0N   28.0W 4.0-5.6 BBAAA  No. Mid-Atlantic Ridge     

 

Along with the moderate quakes in the North Atlantic an M 4.7 also occurred south of Michoacan, Mexico in the northern East Pacific Rise today. It was not reported felt in this remote area. An M 5.7 occurred near this epicenter on December 23, 2020. Forecast 132302 had expected today's event was likely within about 100 km of this epicenter around March 27.

 

O: 28MAR2021 14:29:46   8.1N  102.9W mb=4.7  EMSC   NORTHERN EAST PACIFIC RISE   

P: 27MAR2021 132302     9.0N  103.0W 4.0-5.7 AAAAA  Central Pacific Ocean      

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the Unimak Island of Alaska. This epicenter is to the west of the Alaska Peninsula and may be part of the aftershocks sequence of the October 19, 2020 event of M 7.6 in that region. Forecast 132495 had expected today's event in the Unimak area was likely around March 24.

 

O: 28MAR2021 07:52:00  53.3N  163.7W mb=4.5  EMSC   UNIMAK ISLAND REGION, ALASKA 

P: 24MAR2021 132495    54.3N  162.7W 3.5-5.1 BAAAA  Unimak Islands, Aleutians  

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 29MAR2021 04:04:12  19.1N  103.1E ML=3.9  EMSC   LAOS

O: 29MAR2021 04:10:10  19.1N  103.2E ML=4.0  EMSC   LAOS                         

 

O: 28MAR2021 12:47:11  27.8N   64.8E mb=4.4  EMSC   SOUTHWESTERN PAKISTAN        

P: 25MAR2021 132366    29.0N   68.0E 3.5-4.9 BBCAA  Pakistan                   

 

NEIC reported this earthquake of M 4.4 in Southwestern Pakistan was felt with intensity V in the area(s) of Southwestern Pakistan at Kharan.

 

O: 28MAR2021 18:38:16  54.7N  162.3E mb=4.6  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 26MAR2021 132484    54.0N  161.0E 4.0-5.6 AAAAA  E. of Kamchatka             

 

No significant (M>=5) or unusual earthquakes were reported in Asia today.

 

INDONESIA AND PHILIPPINES

 

O: 28MAR2021 19:35:19   1.4S  100.5E ML=4.1  EMSC   SOUTHERN SUMATRA, INDONESIA  

P: 28MAR2021 132311     0.0N   99.0E 4.0-5.4 ABBAA  So. Sumatera                

 

O: 28MAR2021 07:33:10   3.0S  139.7E ML=4.3  EMSC   NEAR N COAST OF PAPUA, INDONES

P: 26MAR2021 132332     3.0S  139.0E 4.0-5.6 AAAAA  West Irian, PNG            

 

O: 29MAR2021 04:13:18   4.5S  102.7E Mw=5.0  EMSC   SOUTHERN SUMATRA, INDONESIA  

P: 29MAR2021 132327     4.0S  103.0E 4.0-5.5 AAAAA  So. of Sumatera            

 

O: 28MAR2021 13:34:36   6.0S  141.2E mb=4.7  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P: 26MAR2021 132332     3.0S  139.0E 4.0-5.6 ACBAA  West Irian, PNG            

 

NEIC reported this earthquake of M 4.7 in New Guinea was felt with intensity II-III in the area(s) of New Guinea at Goroka (IV); Port Moresby, Balimo and Kiunga, Fly River, PNG.

 

O: 28MAR2021 23:26:43   6.4S  129.6E mb=4.4  EMSC   BANDA SEA                     

P: 30MAR2021 132313     7.0S  129.0E 4.0-5.4 AAAAA  Banda Sea                  

 

O: 28MAR2021 08:30:07   7.8S  127.8E ML=4.5  EMSC   KEPULAUAN BARAT DAYA, INDONESI

P: 26MAR2021 132313     7.0S  127.0E 4.0-5.4 AAAAA  Banda Sea                  

 

O: 28MAR2021 11:52:27   9.6S  118.5E ML=4.1  EMSC   SUMBAWA REGION, INDONESIA    

P: 23MAR2021 132330     9.0S  118.0E 4.0-5.4 BAAAA  Sumbawa Island area        

P: 28MAR2021 132330     8.0S  117.0E 4.0-5.6 ABBAA  Sumbawa Island area        

 

O: 28MAR2021 14:09:00   9.8S  107.3E ML=4.0  EMSC   SOUTH OF JAVA, INDONESIA     

P: 24MAR2021 132326     9.0S  108.0E 4.0-5.7 BAAAA  So. of Java                

 

CENTRAL AND SOUTH AMERICA

 

O: 28MAR2021 15:01:16   5.2N   72.8W mb=4.6  EMSC   COLOMBIA                      

P: 23MAR2021 132303     5.0N   78.0W 4.0-5.6 BACAA  Colombia                   

 

NEIC reported this earthquake of M 4.6 in Colombia was felt with intensity II-III in the area(s) of Colombia at La Calera.

 

O: 28MAR2021 15:41:25  12.9N   88.8W ML=4.3  EMSC   OFFSHORE EL SALVADOR         

P: 30MAR2021 132350    13.0N   88.0W 3.5-5.5 AAAAA  Nicaragua                  

 

O: 29MAR2021 06:35:09  13.8N   58.5W mb=5.5  EMSC   BARBADOS REGION, WINDWARD ISL.

P: 31MAR2021 132356    10.0N   63.0W 3.4-4.9 ACCAA  Windward Islands           

 

O: 29MAR2021 01:49:08  14.3N   89.7W mb=4.6  EMSC   GUATEMALA                    

P: 30MAR2021 132342    14.0N   91.0W 3.5-5.3 AAAAA  Guatemala                  

 

O: 29MAR2021 06:04:36  15.4N   94.8W ML=4.2  EMSC   OFFSHORE OAXACA, MEXICO

O: 28MAR2021 16:11:20  15.4N   94.8W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 31MAR2021 132339    17.0N   95.0W 3.5-5.3 BBAAA  Chiapas, Mexico            

 

O: 28MAR2021 07:14:21  15.4S   71.9W mb=4.8  EMSC   SOUTHERN PERU                 

P: 27MAR2021 132521    16.0S   71.0W 4.0-5.8 AAAAA  So. Peru/Bolivia           

 

O: 29MAR2021 06:18:50  15.5N   93.2W ML=4.0  EMSC   CHIAPAS, MEXICO              

P: 28MAR2021 132342    14.0N   92.0W 3.5-5.3 ABAAA  Guatemala                  

 

O: 28MAR2021 20:01:44  18.0N   66.8W Md=3.0  EMSC   PUERTO RICO REGION           

P: 27MAR2021 132354    19.0N   67.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O: 29MAR2021 01:48:50  18.8N   64.6W ML=3.5  EMSC   VIRGIN ISLANDS REGION        

P: 28MAR2021 132344    19.0N   64.0W 3.0-5.1 AAAAA  Leeward Islands            

 

O: 29MAR2021 04:18:45  19.7N  105.5W ML=4.2  EMSC   OFFSHORE JALISCO, MEXICO     

P: 28MAR2021 132341    18.0N  106.0W 3.5-5.7 ABAAA  Coast of Jalisco, Mexico   

 

O: 28MAR2021 09:20:13  20.2S   70.4W ML=4.0  EMSC   OFFSHORE TARAPACA, CHILE     

P: 29MAR2021 132538    20.0S   70.0W 4.0-5.4 AAAAA  So. Peru/Bolivia           

 

NEIC reported this earthquake of M 4.0 in northern Chile was felt with intensity II-III in the area(s) of northern Chile at Tarapaca in Iquique.

 

O: 28MAR2021 21:55:24  24.1S   67.0W mb=4.3  EMSC   SALTA, ARGENTINA             

P: 29MAR2021 132529    24.0S   68.0W 4.0-5.9 AAAAA  Argentina                  

 

O: 28MAR2021 20:22:00  28.3N  105.1W ML=4.1  EMSC   CHIHUAHUA, MEXICO            

 

O: 28MAR2021 23:40:04  44.8S   80.7W mb=4.7  EMSC   OFF COAST OF AISEN, CHILE    

P: 26MAR2021 132553    43.0S   83.0W 4.0-5.5 ABBAA  Chile Rise                 

 

 

AFRICA AND EUROPE

 

O: 28MAR2021 07:01:35  37.2N    3.8W ML=3.3  EMSC   SPAIN                        

P: 28MAR2021 132392    36.0N    4.0W 3.5-5.0 ABAAA  Morocco/Spain              

 

O: 28MAR2021 17:43:08  42.7N   16.2E ML=3.8  EMSC   ADRIATIC SEA                 

P: 27MAR2021 132445    44.0N   16.0E 3.0-5.1 ABAAA  Italy                      

 

No significant (M>=5) or unusual earthquakes were reported in Europe today.

 

SOUTHWEST PACIFIC

 

O: 28MAR2021 13:49:59  15.3S  175.2W mb=4.4  EMSC   TONGA                        

P: 25MAR2021 132518    15.0S  176.0W 4.0-5.6 BAAAA  Samoa Islands              

 

OCEAN RIDGES

 

O: 28MAR2021 14:29:46   8.1N  102.9W mb=4.7  EMSC   NORTHERN EAST PACIFIC RISE   

P: 27MAR2021 132302     9.0N  103.0W 4.0-5.7 AAAAA  Central Pacific Ocean      

 

O: 28MAR2021 23:01:46  43.6N   28.8W mb=5.6  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 31MAR2021 132456    45.0N   28.0W 4.0-5.6 BBAAA  No. Mid-Atlantic Ridge     

 

O: 28MAR2021 16:27:26  62.4S   58.4W mb=5.0  EMSC   SOUTH SHETLAND ISLANDS       

P: 24MAR2021 132562    61.0S   58.0W 3.0-5.6 AAAAA  So. So. America            

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 28MAR2021 23:08:39  27.1S  179.4E mb=4.6  EMSC   KERMADEC ISLANDS REGION      

P: 25MAR2021 132547    35.0S  179.0E 3.0-4.5 BCAAA  North Island, N.Z.         

 

O: 29MAR2021 03:52:15  33.5S  179.5E ML=3.9  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 25MAR2021 132547    35.0S  179.0E 3.0-4.5 BBAAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

O: 28MAR2021 08:12:01  42.1N  142.6E mb=4.5  EMSC   HOKKAIDO, JAPAN REGION       

P: 29MAR2021 132444    44.0N  142.0E 3.5-5.6 ABAAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 28MAR2021 16:54:39  38.1N  121.9W Md=2.3  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 19MAR2021 132129    37.9N  122.0W 2.5-4.4 CAAAA  Central California         

 

O: 28MAR2021 07:28:41  38.2N  117.8W ml=2.0  EMSC   NEVADA                       

P: 28MAR2021 132377    37.8N  118.2W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 28MAR2021 09:53:59  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P: 31MAR2021 132383    38.7N  122.7W 2.5-4.5 BAAAA  Central California         

 

ALASKA

 

O: 28MAR2021 07:52:00  53.3N  163.7W mb=4.5  EMSC   UNIMAK ISLAND REGION, ALASKA 

P: 24MAR2021 132495    54.3N  162.7W 3.5-5.1 BAAAA  Unimak Islands, Aleutians  

 

O: 29MAR2021 00:15:12  57.4N  155.0W ML=3.1  EMSC   ALASKA PENINSULA             

P: 29MAR2021 132477    54.7N  156.9W 3.5-5.3 ACAAA  Alaska Peninsula           

 

O: 29MAR2021 01:05:52  61.2N  146.4W Mw=3.9  EMSC   SOUTHERN ALASKA              

P: 29MAR2021 132499    60.6N  147.6W 3.2-5.3 AAAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.7 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska at Valdez (IV), Seward and Anchorage.

 

O: 28MAR2021 23:23:25  62.8N  149.7W ML=3.5  EMSC   CENTRAL ALASKA               

P: 27MAR2021 132503    62.7N  149.3W 3.2-4.9 AAAAA  Central Alaska             

 

O: 28MAR2021 08:00:47  65.9N  146.9W ML=3.3  EMSC   NORTHERN ALASKA              

P: 27MAR2021 132503    62.7N  149.3W 3.2-4.9 ACAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.1 in northern Alaska was felt with intensity II-III in the area(s) of northern Alaska at Fairbanks.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 28MAR2021 10:30:30  42.2N  124.5W Ml=2.2  EMSC   OFFSHORE OREGON              

P: 28MAR2021 132460    40.2N  124.2W 2.5-4.4 ABAAA  Off Coast of No. Calif     

 

ROCKY MOUNTAINS REGION

 

O: 28MAR2021 11:07:47  44.4N  114.7W Ml=2.2  EMSC   SOUTHERN IDAHO

O: 28MAR2021 09:50:46  44.4N  114.7W Ml=2.4  EMSC   SOUTHERN IDAHO               

P: 27MAR2021 132451    44.5N  114.7W 2.0-4.3 AAAAA  Montana/Idaho              

 

O: 29MAR2021 02:44:41  38.3N  113.1W ML=2.5  EMSC   UTAH

O: 29MAR2021 04:46:06  38.3N  113.1W ML=2.5  EMSC   UTAH

O: 29MAR2021 01:35:56  38.3N  113.1W ML=3.4  EMSC   UTAH                         

P: 29MAR2021 132432    38.7N  112.6W 2.0-3.9 AAAAA  Utah area                  

 

NEIC reported this earthquake of M 3.2 in Utah was felt with intensity II-III in the area(s) of Utah at Milford.

 

EASTERN U.S./CANADA

 

O: 28MAR2021 21:14:35  35.1N   95.4W ML=2.3  EMSC   OKLAHOMA

O: 29MAR2021 02:33:17  35.1N   95.3W ML=2.2  EMSC   OKLAHOMA

O: 29MAR2021 06:08:50  35.8N   96.7W ML=2.1  EMSC   OKLAHOMA

O: 28MAR2021 18:58:28  35.1N   95.4W ML=2.3  EMSC   OKLAHOMA                     

P: 27MAR2021 132426    35.0N   96.0W 2.0-4.1 AAAAA  Southern Plains            

 

O: 28MAR2021 22:34:06  36.3N   98.2W ML=2.1  EMSC   OKLAHOMA                     

P: 26MAR2021 132427    37.0N   98.0W 2.0-4.2 AAAAA  Southern Plains            

 

HAWAII

 

O: 28MAR2021 17:05:41  19.9N  155.5W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 28MAR2021 13:10:05  19.2N  155.5W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

P: 25MAR2021 132360    19.4N  155.1W 4.0-5.5 BAAAA  Hawaii area                

 

UNUSUAL QUAKE OF M 5.5 EAST OF ITALY WIDELY FELT

 

EARTHQUAKE SUMMARY FOR  MARCH 27, 2021

 

An earthquake of M 5.5 in the Adriatic Sea was widely felt in Italy today. NEIC reported maximum intensity IV in Italy at Santa Maria, Imbaro and Trani Apulien and II-III in San Marco in Lamis Apulien, Termoli, Foggia, Barietta, Frncavilla al Mare, Ripa Teatina, Pescara and Montesilvano, Abruzzen. This is the strongest earthquake within about 200 km of this epicenter since a similar M 5.5 northwest of this on March 29, 2003. The largest earthquake in the area in the past 30 years was an M 6.0 on September 5, 1996. Forecast 132445 had expected today's event in Italy was likely within about 150 km of this epicenter around March 27.

 

O: 27MAR2021 14:01:03  42.5N   16.1E mb=4.3  EMSC   ADRIATIC SEA

O: 27MAR2021 14:13:38  42.5N   16.1E ML=4.1  EMSC   ADRIATIC SEA

O: 27MAR2021 14:21:48  42.5N   16.1E mb=4.4  EMSC   ADRIATIC SEA

O: 27MAR2021 13:47:52  42.7N   16.4E Mw=5.5  EMSC   ADRIATIC SEA                 

P: 27MAR2021 132445    44.0N   16.0E 3.0-5.1 ABAAA  Italy                      

 

The strongest earthquake in the world today was an M 5.7 in southeastern Japan in the Izu Islands. NEIC reported it was felt with intensity III in Kanagawa, Japan. This is the strongest earthquake in the Izu Islands of Japan since an M 6.0 on November 9, 2019 and an aftershock of M 5.8 on November 15, 2017. Forecast 132403 had expected today's activity within about 100 km was likely around March 23.

 

O: 28MAR2021 02:41:30  33.6N  140.4E ML=4.4  EMSC   IZU ISLANDS, JAPAN REGION

O: 28MAR2021 00:26:57  33.6N  140.3E Mw=5.8  EMSC   IZU ISLANDS, JAPAN REGION    

P: 23MAR2021 132403    34.0N  141.0E 4.0-5.7 BAAAA  Off East Coast Honshu      

 

A moderate earthquake of M 4.2 shook the region off northwestern California today. NEIC reported it was felt with intensity II-III in Eureka, California. The last earthquake within about 100 km of this epicenter with M>=4.2 occurred on January 17, 2021of M 4.4 and an M 4.3 on January 12, 2021, the only such events in the area in the past year.  Forecast 132459 had expected today's event within about 25 km was likely around March 28.

 

O: 28MAR2021 00:19:22  40.4N  125.5W Mw=4.1  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 28MAR2021 132459    40.5N  125.8W 2.5-4.4 AAAAA  Off Coast of No. Calif     

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 28MAR2021 06:41:17  24.6N  122.8E mb=4.8  EMSC   TAIWAN REGION                

O: 28MAR2021 06:41:18  24.5N  122.8E ML=5.2  TAI    Hualien, Taiwan              

P: 28MAR2021 132370    24.0N  125.0E 4.0-5.4 AABAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity III in Hualien; II in Yilan, Nantou, Changhua, Taitung, Taipei, Miaoli, and Hsinchu, Counties, Taiwan.

 

O: 27MAR2021 17:24:13  35.5N   89.5E mb=4.5  EMSC   WESTERN XIZANG               

P: 28MAR2021 132436    35.0N   93.0E 3.8-5.4 AACAA  Xizang                     

 

No significant (M>=5) or unusual earthquakes were reported in Asia today.

 

INDONESIA AND PHILIPPINES

 

O: 27MAR2021 09:46:12   1.5N  127.2E Mw=5.0  EMSC   HALMAHERA, INDONESIA         

P: 28MAR2021 132307     2.0N  127.0E 4.0-5.6 AAAAA  Halmahera                  

 

O: 27MAR2021 10:18:05   2.0S   99.3E mb=4.7  EMSC   KEP. MENTAWAI REGION, INDONESIA

P: 28MAR2021 132311     0.0N   99.0E 4.0-5.4 ABAAA  So. Sumatera               

 

O: 27MAR2021 15:28:57   4.6S  139.9E ML=4.1  EMSC   PAPUA, INDONESIA

O: 27MAR2021 15:07:06   2.3S  140.1E ML=4.3  EMSC   EAR N COAST OF PAPUA, INDONESI

P: 26MAR2021 132332     3.0S  139.0E 4.0-5.6 AAAAA  West Irian, PNG            

 

O: 27MAR2021 08:46:40   2.5N   99.0E mb=4.8  EMSC   NORTHERN SUMATRA, INDONESIA  

P: 24MAR2021 132311     1.0N   98.0E 4.0-5.5 BBAAA  So. Sumatera               

 

O: 28MAR2021 04:18:24   2.8N  124.3E ML=4.3  EMSC   CELEBES SEA                  

P: 28MAR2021 132307     2.0N  127.0E 4.0-5.6 AACAA  Halmahera                  

 

O: 27MAR2021 17:33:44   3.0S  139.6E ML=4.1  EMSC   PAPUA, INDONESIA             

P: 26MAR2021 132332     3.0S  139.0E 4.0-5.6 AAAAA  West Irian, PNG            

 

O: 28MAR2021 02:58:49   5.2S  142.8E ML=4.3  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P: 22MAR2021 132325     7.0S  144.0E 4.0-5.5 CBAAA  Papua New Guinea           

 

O: 27MAR2021 09:12:08  10.7S  113.8E ML=4.4  EMSC   SOUTH OF JAVA, INDONESIA     

P: 26MAR2021 132522    11.0S  116.0E 4.0-5.4 AABAA  So. of Indonesia            

 

 

CENTRAL AND SOUTH AMERICA

 

O: 27MAR2021 07:14:52  13.9N   92.8W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 28MAR2021 132342    14.0N   92.0W 3.5-5.3 AAAAA  Guatemala                  

 

O: 27MAR2021 10:42:54  16.5N   99.1W ML=4.5  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 24MAR2021 132353    17.0N  100.0W 3.5-5.1 BAAAA  Oaxaca, Mexico             

 

O: 27MAR2021 11:13:33  19.2N   66.5W Md=3.2  EMSC   PUERTO RICO REGION           

P: 27MAR2021 132354    19.0N   67.0W 3.4-5.3 AAAAA  Puerto Rico                 

 

O: 27MAR2021 20:17:10  19.9S   69.9W Mw=4.5  EMSC   TARAPACA, CHILE              

P: 29MAR2021 132538    20.0S   70.0W 4.0-5.4 AAAAA  So. Peru/Bolivia           

 

NEIC reported this earthquake of M 4.5 in Tarapaca Chile was felt with intensity II-III in the area(s) of Tarapaca Chile in Iquique and Arica.

 

O: 28MAR2021 02:03:52  20.2N   70.7W ML=3.0  EMSC   DOMINICAN REPUBLIC REGION    

P: 26MAR2021 132354    19.0N   71.0W 3.4-5.3 ABAAA  Puerto Rico                

 

No significant (M>=5) or unusual earthquakes were reported in Central or South America today.

 

AFRICA AND EUROPE

 

O: 27MAR2021 19:13:24  12.8S   45.6E ML=3.3  EMSC   MAYOTTE REGION               

P: 25MAR2021 132516    12.0S   45.0E 3.0-4.6 AAAAA  Madagascar area            

 

O: 27MAR2021 14:01:03  42.5N   16.1E mb=4.3  EMSC   ADRIATIC SEA

O: 27MAR2021 14:13:38  42.5N   16.1E ML=4.1  EMSC   ADRIATIC SEA

O: 27MAR2021 14:21:48  42.5N   16.1E mb=4.4  EMSC   ADRIATIC SEA

O: 27MAR2021 13:47:52  42.7N   16.4E Mw=5.5  EMSC   ADRIATIC SEA                 

P: 27MAR2021 132445    44.0N   16.0E 3.0-5.1 ABAAA  Italy                      

 

O: 27MAR2021 13:00:45  41.1N   19.4E ML=3.4  EMSC   ADRIATIC SEA                 

P: 28MAR2021 132437    42.0N   19.0E 3.0-5.1 AAAAA  Adriatic Sea                

 

SOUTHWEST PACIFIC

 

O: 27MAR2021 11:14:44  21.3S  171.2E mb=4.8  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 27MAR2021 132531    22.0S  172.0E 4.0-5.4 AAAAA  Loyalty Islands            

 

O: 27MAR2021 21:09:11  25.0S  179.6E mb=4.4  EMSC   SOUTH OF FIJI ISLANDS        

 

No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.

 

OCEAN RIDGES

 

O: 27MAR2021 09:19:37  61.6S   55.0W mb=4.5  EMSC   SOUTH SHETLAND ISLANDS       

O: 28MAR2021 16:27     62.4S   58.5W mb=4.5  GUC    Antartida at Antartida, Base F

P: 24MAR2021 132562    61.0S   58.0W 3.0-5.6 BBAAA  So. So. America            

 

GUC reported this earthquake was felt with intensity  V in  Antartida at Antartida, Base Frei and IV in Base Prat, Chile.

 

No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 27MAR2021 09:20:29  30.0S  177.2W mb=4.5  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 29MAR2021 132546    30.0S  178.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

O: 27MAR2021 21:10:34  33.1S  178.5E ML=4.5  EMSC   SOUTH OF KERMADEC ISLANDS    

O: 27MAR2021 23:02:35  33.8S  179.9E ML=3.8  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 25MAR2021 132547    35.0S  179.0E 3.0-4.5 ABAAA  North Island, N.Z.         

 

O: 27MAR2021 13:28:54  37.8S  179.8E mb=4.4  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 27MAR2021 13:28:58  37.7S  179.5E ML=4.4  GEONET Felt with weak intensity

P: 26MAR2021 132549    38.0S  178.0E 3.0-4.4 AABAA  North Island, N.Z.         

 

GEONET reported this earthquake was felt with weak intensity in North Island, New Zealand with 2 reports of which 2 reported weak shaking; 0 light, 0 moderate, 0 strong, 0 Severe and 0 extreme intensity.

 

JAPAN AND KURIL ISLANDS

 

O: 28MAR2021 02:41:30  33.6N  140.4E ML=4.4  EMSC   IZU ISLANDS, JAPAN REGION

O: 28MAR2021 00:26:57  33.6N  140.3E Mw=5.8  EMSC   IZU ISLANDS, JAPAN REGION    

P: 23MAR2021 132403    34.0N  141.0E 4.0-5.7 BAAAA  Off East Coast Honshu      

 

O: 27MAR2021 07:34:54  45.1N  151.1E mb=4.5  EMSC   KURIL ISLANDS                

P: 27MAR2021 132444    44.0N  149.0E 3.5-5.4 ABBAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 27MAR2021 07:05:08  35.8N  117.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 27MAR2021 20:40:05  35.9N  117.7W Ml=2.2  EMSC   CENTRAL CALIFORNIA

O: 27MAR2021 09:17:19  35.7N  117.6W Ml=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 29MAR2021 132375    36.3N  118.1W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 27MAR2021 08:17:09  32.6N  115.7W Ml=2.5  EMSC   BAJA CALIFORNIA, MEXICO      

P: 29MAR2021 132411    32.5N  115.7W 2.5-4.4 AAAAA  So. California             

 

O: 27MAR2021 22:09:30  33.6N  116.7W Ml=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 25MAR2021 132413    33.9N  116.9W 2.5-4.4 AAAAA  So. California             

 

O: 27MAR2021 15:55:31  35.4N  118.9W Ml=2.0  EMSC   BAKERSFIELD URBAN AREA, CALIF.

P: 26MAR2021 132419    35.0N  119.2W 2.5-5.0 AAAAA  So. California             

 

O: 27MAR2021 08:49:36  36.6N  121.3W ML=2.4  EMSC   CENTRAL CALIFORNIA           

P: 29MAR2021 132382    36.4N  121.0W 2.5-4.7 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.6 in Central California was felt with intensity II-III in the area(s) of Central California at San Juan Bautista, Los Banos and Morgan Hill.

 

O: 27MAR2021 07:10:51  38.2N  117.9W ML=2.8  EMSC   NEVADA                       

P: 31MAR2021 132378    38.6N  118.6W 2.5-4.6 BAAAA  California/Nevada area     

 

O: 27MAR2021 07:19:19  38.3N  119.5W Md=2.4  EMSC   CENTRAL CALIFORNIA           

P: 23MAR2021 132380    39.1N  119.6W 2.5-4.8 BAAAA  California/Nevada area     

 

O: 27MAR2021 09:00:37  38.7N  122.7W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P: 31MAR2021 132383    38.7N  122.7W 2.5-4.5 BAAAA  Central California         

 

O: 28MAR2021 01:36:47  39.6N  119.8W ml=2.1  EMSC   NEVADA                       

P: 23MAR2021 132380    39.1N  119.6W 2.5-4.8 BAAAA  California/Nevada area     

 

O: 28MAR2021 00:19:22  40.4N  125.5W Mw=4.1  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 28MAR2021 132459    40.5N  125.8W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

 

ALASKA

 

O: 27MAR2021 13:30:02  52.8N  169.8W ML=3.3  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 25MAR2021 132481    52.4N  170.7W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

O: 27MAR2021 14:01:32  54.9N  156.8W ML=3.2  EMSC   SOUTH OF ALASKA              

P: 29MAR2021 132477    54.7N  156.9W 3.5-5.3 AAAAA  Alaska Peninsula           

 

O: 27MAR2021 11:24:09  58.6N  153.5W ML=3.1  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 25MAR2021 132500    60.1N  153.4W 3.2-4.9 ABAAA  Central Alaska             

 

O: 27MAR2021 18:06:06  62.9N  149.8W ML=3.1  EMSC   CENTRAL ALASKA               

P: 27MAR2021 132503    62.7N  149.3W 3.2-4.9 AAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 27MAR2021 11:50:45  46.8N  119.8W Md=2.0  EMSC   WASHINGTON                   

P: 28MAR2021 132452    47.7N  117.4W 2.0-4.1 AABAA  Montana/Idaho              

 

ROCKY MOUNTAINS REGION

 

O: 27MAR2021 12:00:28  31.7N  104.4W ML=2.9  EMSC   WESTERN TEXAS

O: 27MAR2021 10:00:26  31.7N  104.4W ML=2.6  EMSC   WESTERN TEXAS                

P: 25MAR2021 132409    32.2N  104.1W 2.0-4.1 AAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 27MAR2021 09:33:19  34.4N   97.4W ML=2.2  EMSC   OKLAHOMA

O: 27MAR2021 15:30:24  35.3N   98.0W ML=2.7  EMSC   OKLAHOMA

O: 27MAR2021 23:26:18  35.4N   97.9W ML=2.2  EMSC   OKLAHOMA

O: 27MAR2021 23:31:46  35.6N   97.1W ML=2.1  EMSC   OKLAHOMA                     

P: 27MAR2021 132426    35.0N   96.0W 2.0-4.1 AAAAA  Southern Plains            

 

O: 27MAR2021 10:31:36  36.7N   97.7W ML=2.8  EMSC   OKLAHOMA                     

P: 26MAR2021 132427    37.0N   98.0W 2.0-4.2 AAAAA  Southern Plains            

 

NEIC reported this earthquake of M 2.6 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma at Union City and Tuttle.

 

HAWAII

 

No earthquakes of M>=3 were located in Hawaii.

 

STRONG QUAKE IN RYUKYU ISLANDS, JAPAN

 

EARTHQUAKE SUMMARY FOR  MARCH 26, 2021

 

The strongest earthquake in the world today was an M 5.9-6.8 in the Ryukyu Islands of Japan. NEIC reported it was felt with intensity II-III in Okinawa, Japan at Yomitan, Chatan, Ginowan, Okinawa, Ishikawa, Gushikawa. The Central Weather Bureau of Taiwan (CWB) reported this event with M 6.8 was widely felt in Taiwan. CWB reported this earthquake was felt with intensity II in Hualien and Taichung, and I in Yilan, Nantou, Taichung, Kaohsiung, Changhua, Yunlin, Taipei, Chiayi, Tainan and Keelung, Taiwan. The last earthquake of greater magnitude in this area of the Ryukyu Islands was an M 6.5 on March 2, 2014. Large events have since occurred close to Taiwan such as an M 6.0 on May 9, 2017 east of Taiwan. Forecasts 132370 and 132367 had expected today's activity was likely at the end of March.

 

O: 26MAR2021 22:02:16  26.1N  125.0E Mw=5.9  EMSC   NORTHEAST OF TAIWAN          

O: 26MAR2021 22:02:11  25.8N  125.5E ML=6.8  TAI    Hualien, Taiwan              

P: 28MAR2021 132370    24.0N  125.0E 4.0-5.4 ABAAA  Taiwan                     

P: 30MAR2021 132367    26.0N  128.0E 4.0-5.4 BABAA  Ryukyu Islands             

 

A series of three moderate earthquakes also occurred today in Ocean Ridge areas - an M 5.0 and M 5.1 in the Southeast Indian Ridge; an M 5.2 in the Jan Mayen Islands and an M 5.7 and 5.7 in the Pacific Antarctic Ridge. These may be related to the current geomagnetic storm as they all occurred at high latitudes.

 

O: 26MAR2021 08:29:41  50.5S  112.8E mb=5.0  EMSC   SOUTHEAST INDIAN RIDGE       

 

O: 27MAR2021 06:59:58  71.4N    4.4W mb=5.2  EMSC   JAN MAYEN ISLAND REGION      

 

O: 26MAR2021 21:03:28  62.6S  161.6W Mw=5.7  EMSC   PACIFIC-ANTARCTIC RIDGE      

 

An earthquake of M 3.4 occurred today in western South Dakota. NEIC reported it was felt with intensity II-III in South Dakota at Edgemont, Hot Springs, Custer, Oelrichs, Rapid City, Spearfish, Holabiro and in Upton, Wyoming. Earthquakes in this area of South Dakota often precede by hours or days strong earthquakes in Alaska. This is the strongest earthquake within about 200 km of this epicenter since an M 3.6 on September 22, 2020. That event occurred in Wyoming and probably occurred in a quarry operation. The last earthquake in South Dakota within about 150 km of this epicenter with M>=3.4 was an M 3.5 on December 12, 2013. The strongest earthquake in this area in the past 30 years was an M 4.0 on November 14, 2011. Forecast 132441 had expected regional seismic enhancement was likely at the end of March.

 

O: 26MAR2021 14:52:24  43.3N  103.7W ML=3.4  EMSC   SOUTH DAKOTA                 

P: 24MAR2021 132441    40.6N  106.6W 2.0-3.9 ACBAA  Colorado area              

 

The quiet conditions in Alaska which have persisted since the M 7.2 in Honshu, Japan of March 20 were interrupted today by an M 4.8 and aftershocks in the western Fox Islands, Aleutians. Today's event of M 4.8 is the largest in western Fox Islands within about 200 km of this epicenter since an M 6.4 about 100 km to the east occurred on December 1, 2020. Forecast 132481 had expected today's activity was likely around March 25.

 

O: 26MAR2021 17:03:59  52.9N  169.8W mb=3.7  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 26MAR2021 17:27:51  52.9N  169.8W ml=3.0  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 26MAR2021 20:47:12  52.9N  169.8W ML=3.5  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 26MAR2021 14:41:20  52.7N  169.8W mb=4.8  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 25MAR2021 132481    52.4N  170.7W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 26MAR2021 19:02:08  27.6N   92.7E mb=5.0  EMSC   ARUNACHAL PRADESH, INDIA     

P: 22MAR2021 132365    27.0N   92.0E 4.0-5.5 BAAAA  Myanmar                    

 

NEIC reported this earthquake of M 5.0 in Arunachal Pradesh, India was felt with intensity IV in the area(s) of Arunachal Pradesh, India in Itanagar, and in Assam in Lakhimpur, Numaligarh Refinery Township, Jorhat, Gauhati and II-III in Tawang, Golaghat, North Guwahati, Dhemay, and Tihu.

 

O: 26MAR2021 23:08:30  40.8N   83.3E mb=4.6  EMSC   SOUTHERN XINJIANG, CHINA      

P: 22MAR2021 132447    41.0N   83.0E 4.0-5.6 BAAAA  Kirgizstan/Xinjiang        

 

O: 26MAR2021 10:37:17  36.6N   71.0E mb=4.5  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 26MAR2021 132388    37.0N   70.0E 3.8-5.5 AAAAA  Hindu Kush/Pakistan        

 

O: 26MAR2021 18:23:39  55.8N  163.6E mb=4.7  EMSC   OFF EAST COAST OF KAMCHATKA  

P: 24MAR2021 132487    56.0N  165.0E 4.0-5.7 AAAAA  Komandorsky Isl            

 

O: 26MAR2021 20:29:33  55.9N  162.8E mb=4.5  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 24MAR2021 132484    54.0N  163.0E 4.0-5.5 ABAAA  E. of Kamchatka            

 

INDONESIA AND PHILIPPINES

 

O: 26MAR2021 16:29:29   0.8N  125.7E ML=4.3  EMSC   MOLUCCA SEA                  

P: 24MAR2021 132309     2.0N  126.0E 4.0-5.6 ABAAA  Mindanao, Philippines       

 

O: 26MAR2021 16:33:52   1.0S  120.7E ML=4.3  EMSC   SULAWESI, INDONESIA          

P: 28MAR2021 132300     0.0N  120.0E 4.0-5.4 AAAAA  Celebes Sea                

P: 31MAR2021 132329     1.0S  122.0E 4.0-5.4 BAAAA  Sulawesi area              

 

O: 26MAR2021 08:59:34   1.7S  139.4E ML=4.4  EMSC   NEAR N COAST OF PAPUA, INDONES

O: 26MAR2021 11:40:46   2.1S  139.1E mb=4.6  EMSC   NEAR N COAST OF PAPUA, INDONES

P: 26MAR2021 132332     3.0S  139.0E 4.0-5.6 AAAAA  West Irian, PNG            

 

O: 26MAR2021 16:42:21   2.6N  128.5E ML=4.1  EMSC   HALMAHERA, INDONESIA         

P: 28MAR2021 132307     2.0N  127.0E 4.0-5.6 AABAA  Halmahera                  

 

O: 26MAR2021 10:49:43   4.0S  134.1E ML=4.0  EMSC   PAPUA, INDONESIA             

P: 24MAR2021 132331     4.0S  134.0E 4.0-5.4 AAAAA  West Irian, PNG            

 

O: 26MAR2021 15:46:08   7.2S  155.4E mb=4.9  EMSC   SOLOMON ISLANDS              

P: 26MAR2021 132320     6.0S  154.0E 4.0-5.6 ABBAA  New Britain                

 

O: 26MAR2021 22:45:51   8.0N  126.3E mb=4.3  EMSC   MINDANAO, PHILIPPINES        

P: 29MAR2021 132308     7.0N  127.0E 4.0-5.6 BAAAA  Halmahera                  

 

O: 26MAR2021 13:36:06  11.7S  118.5E ML=4.0  EMSC   SOUTH OF SUMBAWA, INDONESIA  

P: 26MAR2021 132522    11.0S  116.0E 4.0-5.4 AACAA  So. of Indonesia           

 

No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.

 

CENTRAL AND SOUTH AMERICA

 

O: 27MAR2021 20:17     19.5S   69.9W mb=4.5  GUC    Tarapaca at Alto Hospicio, Hua

P: 29MAR2021 132538    20.0S   70.0W 4.0-5.4 AAAAA  So. Peru/Bolivia           

 

GUC reported thise earthquake was felt with intensity  IV in  Tarapaca at Alto Hospicio, Huara, Iquique, Mamina, Pisagua; III in La Tirana, Pozo Almonte and II in Camina, Pica; in Arica with III in Arica and Cuya and II in Codpa, Chile.

 

O: 26MAR2021 20:06:36   1.9S   77.4W mb=4.4  EMSC   ECUADOR                      

P: 25MAR2021 132316     1.0S   77.0W 4.0-5.6 AAAAA  Ecuador                    

 

O: 26MAR2021 15:57:43   2.7N   59.6W mb=4.7  EMSC   GUYANA                       

 

O: 26MAR2021 11:21:27   8.6S   73.5W mb=4.2  EMSC   PERU-BRAZIL BORDER REGION    

P: 31MAR2021 132314     9.0S   75.0W 3.5-5.0 BABAA  Brazil                     

 

O: 26MAR2021 14:07:53  15.1N   94.6W ML=4.0  EMSC   OFF COAST OF OAXACA, MEXICO  

O: 26MAR2021 13:11:26  15.2N   94.7W ML=4.2  EMSC   OFF COAST OF OAXACA, MEXICO  

P: 27MAR2021 132339    17.0N   94.0W 3.5-5.6 ABAAA  Chiapas, Mexico            

 

O: 27MAR2021 02:17:45  15.4N   61.1W ML=4.3  EMSC   DOMINICA REGION, LEEWARD ISLAN

P: 24MAR2021 132344    18.0N   64.0W 3.0-5.2 BCCAA  Leeward Islands            

 

O: 26MAR2021 09:55:49  15.8N   95.0W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 26MAR2021 23:52:38  15.8N   95.6W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 27MAR2021 05:30:27  15.6N   95.8W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 30MAR2021 132353    15.0N   97.0W 3.5-5.1 BAAAA  Oaxaca, Mexico             

 

O: 26MAR2021 13:19:37  16.8N   60.7W mb=4.9  EMSC   GUADELOUPE REGION, LEEWARD ISL

P: 24MAR2021 132344    18.0N   64.0W 3.0-5.2 ABCAA  Leeward Islands            

 

O: 27MAR2021 06:58:59  17.3N  101.7W ML=4.0  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 30MAR2021 132347    17.0N  102.0W 3.5-5.2 BAAAA  Michoacan, Mexico          

 

O: 27MAR2021 01:07:24  19.2N   66.5W Md=3.3  EMSC   PUERTO RICO REGION

O: 26MAR2021 13:46:37  19.2N   66.6W Md=3.3  EMSC   PUERTO RICO REGION           

P: 27MAR2021 132354    19.0N   67.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O: 26MAR2021 08:06:15  23.3S   69.2W ML=4.0  EMSC   ANTOFAGASTA, CHILE           

P: 29MAR2021 132529    24.0S   68.0W 4.0-5.9 BAAAA  Argentina                  

 

O: 26MAR2021 17:09:55  26.3N  111.4W mb=4.4  EMSC   BAJA CALIFORNIA SUR, MEXICO  

P: 31MAR2021 132359    28.0N  112.0W 3.5-5.1 BBAAA  Gulf of California         

 

NEIC reported this earthquake of M 4.4 in Loreto Baja California was felt with intensity II-III in the area(s) of Loreto Baja California.

 

O: 26MAR2021 09:08:35  32.1S   71.7W ML=4.1  EMSC   OFFSHORE COQUIMBO, CHILE     

P: 23MAR2021 132541    33.0S   72.0W 4.0-5.8 BAAAA  Central Chile              

P: 29MAR2021 132541    32.0S   70.0W 4.0-5.6 AABAA  Central Chile              

 

NEIC reported this earthquake of M 4.0 in Coquimbo, Chile was felt with intensity II-III in the area(s) of Coquimbo, Chile at Vina del Mar, Valparaiso.

 

 

AFRICA AND EUROPE

 

No significant (M>=5) or unusual earthquakes were reported in Europe today.

 

SOUTHWEST PACIFIC

 

O: 26MAR2021 11:21:18  18.2S  178.2W mb=4.4  EMSC   FIJI REGION

O: 26MAR2021 08:13:10  18.2S  178.0W mb=4.5  EMSC   FIJI REGION                  

P: 27MAR2021 132525    19.0S  178.0W 4.0-5.8 AAAAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 26MAR2021 22:59:36  50.2S  112.7E mb=5.1  EMSC   SOUTHEAST INDIAN RIDGE

O: 26MAR2021 08:29:41  50.5S  112.8E mb=5.0  EMSC   SOUTHEAST INDIAN RIDGE       

 

O: 27MAR2021 06:59:58  71.4N    4.4W mb=5.2  EMSC   JAN MAYEN ISLAND REGION      

 

O: 26MAR2021 21:03:28  62.6S  161.6W Mw=5.7  EMSC   PACIFIC-ANTARCTIC RIDGE      

O: 26MAR2021 21:12:12  62.3S  160.0W Mw=5.7  EMSC   PACIFIC-ANTARCTIC RIDGE

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 26MAR2021 15:50:08  32.6S  179.5E ML=3.7  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 25MAR2021 132547    35.0S  179.0E 3.0-4.5 ACAAA  North Island, N.Z.         

 

O: 27MAR2021 04:03:41  37.4S  180.0E ML=3.7  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O: 27MAR2021 05:01:49  37.4S  179.9E ML=3.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O: 27MAR2021 02:16:09  37.5S  180.0E ML=3.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O: 27MAR2021 03:59:03  37.3S  179.9E mb=4.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 26MAR2021 132549    38.0S  178.0E 3.0-4.4 AABAA  North Island, N.Z.         

 

NEIC reported this earthquake of M 4.5 off northern North Island, New Zealand  was felt with intensity II-III in the area(s) of off northern North Island, New Zealand in Ruatoria, Gisborne.

 

O: 27MAR2021 03:32:16  37.5S  180.0W ML=3.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 25MAR2021 132545    37.0S  180.0W 3.5-5.1 AAAAA  E. of North Islands N.Z.   

 

O: 26MAR2021 20:00:31  38.7S  174.5E ML=3.5  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 26MAR2021 05:45:11  38.8S  174.6E MS=3.2  GEONET Felt with moderate intensity

P: 27MAR2021 132554    40.0S  174.0E 3.0-4.6 ABAAA  North Island, N.Z.         

 

GEONET reported this earthquake was felt with moderate intensity in southeastern North Island. More than 17 people reported feeling this earthquake. Light to moderate intensity was reported throughout much of southern and eastern North Island and northern South Island.  13 reports of weak intensity;  4 of light intensity; 0 with moderate; 0 with strong shaking and 0 with severe and 0 with extreme intensity.

NEIC reported this earthquake of M 3.3 west of North Island, New Zealand  was felt with intensity II-III in the area(s) in western North Island, New Zealand at Waitara, New Plymouth, Taranaki and in Ohura Manawatu-Wanganui.

 

JAPAN AND KURIL ISLANDS

 

O: 26MAR2021 22:02:16  26.1N  125.0E Mw=5.9  EMSC   NORTHEAST OF TAIWAN          

P: 28MAR2021 132370    24.0N  125.0E 4.0-5.4 ABAAA  Taiwan                     

P: 30MAR2021 132367    26.0N  128.0E 4.0-5.4 BABAA  Ryukyu Islands             

 

O: 26MAR2021 22:02:11  25.8N  125.5E ML=6.8  TAI    Hualien, Taiwan              

P: 28MAR2021 132370    24.0N  125.0E 4.0-5.4 ABAAA  Taiwan                     

P: 30MAR2021 132367    26.0N  128.0E 4.0-5.4 AABAA  Ryukyu Islands             

 

CWB reported this earthquake was felt with intensity II in Hualien and Taichung, and I in Yilan, Nantou, Taichung, Kaohsiung, Changhua, Yunlin, Taipei, Chiayi, Tainan and Keelung, Taiwan.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 26MAR2021 08:27:47  31.5N  115.7W Ml=3.0  EMSC   BAJA CALIFORNIA, MEXICO      

P: 26MAR2021 132410    31.9N  116.3W 2.5-4.4 AAAAA  So. California             

 

O: 26MAR2021 19:12:58  36.3N  118.3W Ml=2.1  EMSC   CENTRAL CALIFORNIA           

P: 31MAR2021 132378    38.6N  118.6W 2.5-4.6 BAAAA  California/Nevada area     

 

O: 26MAR2021 08:15:32  37.7N  119.5W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P: 26MAR2021 132377    37.4N  118.6W 2.5-4.7 AAAAA  California/Nevada area     

 

O: 26MAR2021 13:40:32  38.2N  117.8W ml=2.0  EMSC   NEVADA

O: 26MAR2021 13:34:20  38.2N  117.8W ML=3.3  EMSC   NEVADA                       

P: 28MAR2021 132377    37.8N  118.2W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 26MAR2021 07:21:06  38.8N  122.8W Md=2.3  EMSC   NORTHERN CALIFORNIA          

P: 24MAR2021 132383    38.8N  122.7W 2.5-4.5 AAAAA  Central California         

 

O: 26MAR2021 22:14:31  39.0N  123.1W ML=2.5  EMSC   NORTHERN CALIFORNIA

O: 26MAR2021 22:12:04  39.0N  123.0W ML=2.4  EMSC   NORTHERN CALIFORNIA          

P: 29MAR2021 132384    39.8N  123.5W 2.5-4.6 BAAAA  Central California         

 

NEIC reported this earthquake of M 2.8 in Northern California was felt with intensity II-III in the area(s) of Northern California in Lakeport, Hopland, and Ukiah.

 

O: 26MAR2021 17:15:00  49.5N  120.5W Ml=2.2  EMSC   BRITISH COLUMBIA, CANADA     

P: 26MAR2021 132473    47.5N  121.8W 2.0-4.0 ABAAA  Washington state, U.S.     

 

 

ALASKA

 

O: 26MAR2021 17:03:59  52.9N  169.8W mb=3.7  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 26MAR2021 17:27:51  52.9N  169.8W ml=3.0  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 26MAR2021 20:47:12  52.9N  169.8W ML=3.5  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 26MAR2021 14:41:20  52.7N  169.8W mb=4.8  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 25MAR2021 132481    52.4N  170.7W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

 

O: 26MAR2021 10:23:29  48.8N  128.9W MB=3.4  ECAN Port Alice, BC                 

P: 26MAR2021 132472    49.9N  130.2W 2.8-5.3 ABAAA  Vancouver Island area      

 

O: 26MAR2021 05:19:41  60.3N  140.2W MB=3.2  ECAN Yakutat, AK                    

P: 27MAR2021 132498    60.0N  138.0W 3.2-5.4 AAAAA  Central Alaska             

 

ROCKY MOUNTAINS REGION

 

O: 26MAR2021 14:52:24  43.3N  103.7W ML=3.4  EMSC   SOUTH DAKOTA                 

P: 24MAR2021 132441    40.6N  106.6W 2.0-3.9 ACBAA  Colorado area               

 

O: 26MAR2021 17:07:40  44.3N  114.8W Ml=2.0  EMSC   SOUTHERN IDAHO

O: 26MAR2021 23:09:23  44.3N  115.2W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 26MAR2021 12:30:16  44.3N  115.2W Ml=2.0  EMSC   SOUTHERN IDAHO               

P: 24MAR2021 132451    44.5N  115.2W 2.0-4.3 AAAAA  Montana/Idaho              

P: 27MAR2021 132451    44.5N  114.7W 2.0-4.3 AAAAA  Montana/Idaho              

 

O: 27MAR2021 03:33:22  44.3N  116.2W Ml=2.2  EMSC   SOUTHERN IDAHO               

P: 24MAR2021 132451    44.5N  115.2W 2.0-4.3 BAAAA  Montana/Idaho              

 

O: 26MAR2021 22:01:29  31.7N  104.4W ML=3.4  EMSC   WESTERN TEXAS                

O: 26MAR2021 07:46:36  32.7N  100.7W mb=2.6  EMSC   WESTERN TEXAS                

P: 25MAR2021 132409    32.2N  104.1W 2.0-4.1 AAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 26MAR2021 16:31:25  35.4N   97.9W ML=2.9  EMSC   OKLAHOMA

O: 27MAR2021 00:13:08  35.4N   97.9W ML=2.2  EMSC   OKLAHOMA

O: 26MAR2021 12:57:36  35.4N   97.9W ML=2.4  EMSC   OKLAHOMA                     

P: 26MAR2021 132427    37.0N   98.0W 2.0-4.2 ABAAA  Southern Plains            

 

NEIC reported this earthquake of M 2.5 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma with IV in Minco and II in Union City.

 

O: 26MAR2021 08:38:29  49.7N   91.2W MB=2.1  ECAN Sioux Lookout, ON              

O: 26MAR2021 08:10:07  49.7N   91.2W MB=1.5  ECAN Sioux Lookout, ON              

O: 26MAR2021 07:49:02  49.7N   91.2W MB=2.0  ECAN Sioux Lookout, ON              

 

O: 25MAR2021 12:12:51  47.0N   67.0W MB=2.1  ECAN Plaster Rock, NB               

P: 27MAR2021 132448    47.0N   69.0W 2.0-4.0 AABAA  Maine                      

 

O: 25MAR2021 08:20:14  50.7N   63.4W MB=1.4  ECAN Havre-Saint-Pierre, QC         

P: 31MAR2021 132442    49.0N   66.0W 2.0-3.9 CBBAA  E. of Maine                

 

HAWAII

 

No earthquakes of M>=3 were located in Hawaii.