TODAY IN EARTHQUAKE HISTORY

 

GLOBAL:

 

The following events of Mw>=7 have occurred on this date in recorded history:

 

MO DA HR MN SC YEAR  LATIT   LONGIT  DEP MW  LOCATION

 

 5 13  0  0 00  986  36.200   43.100   0 0.0   IRAQ

 

Severe damage at AL-MAWSIL (MOSUL), Iraq. Many killed. MMI: VIII

 

 5 13  0  0  0 1647 -14.000  -76.500  40 7.9   Central Peru

 

Severe damage at Santiago. 2000 killed.

 

 5 13  0  0  0 1695  36.000  111.500   0 8.0   So. China

 5 13  0  0  0 1717  39.000  142.700   0 7.6   Off East Coast Honshu

 5 13 12 36  0 1784 -16.500  -72.000  70 8.0   So. Peru/Bolivia

 

Moderate damage at Arequipa, Camana, Moquegua, Peru (IX). 54 killed a tsunami was generated.

 

 5 13 11 22  0 1897  12.300  123.300  60 7.9   Luzon, Philippines

 5 13 12 30  0 1897  12.000  124.000  60 7.9   Luzon, Philippines

 

Severe damage (VIII) at Masbate Island.

 

 5 13  6 34  6 1903 -17.000  168.000  60 7.9   Vanuatu Islands

 5 13  4 23 00 1990 -40.300  176.100  21 6.7   NEW ZEALAND

 

Moderate damage (VIII) at  DANNEVIRKE,  WELLINGTON      

 

TODAY IN EARTHQUAKE HISTORY

 

U.S./CANADA

 

Following are events of Mb>=5 which have occurred in this region on this date in history:

 

MO DA HR MN SC YEAR  LATIT   LONGIT  DEP MW  LOCATION

 

 5 13  6 20  0 1910  33.670 -117.320   0 5.0   So. California

 

Lake Elsinore region. Chinmneys toppled in the district between Corona and Wildomar where rocks rolled down the hillside. Felt to Barstow, Ventura and San Diego.

 

 5 13  7 58  6 1910  57.000 -160.000 100 6.8   Alaska Peninsula

 5 13 17 15  0 1914  41.224 -111.959   0 5.7   UTah              

 

Windows were broken and chimneys thrown down at Ogden. Probably caused by a slip in the Wasatch Fault near the Idaho line.  Felt 30 miles south of Salt Lake City and over a distance of 140 miles.

 

 5 13  2 30  0 1916  43.700 -116.200   0 5.6   Montana/Idaho

 

Boise ID. Strong shock. Chimneys were wrecked, and people rushed into the street. Strong at Weiser, 60 miles west. The epicenter was probably NW of Boise. Reclamation ditches were damaged and the flow of gas was altered.  Felt at Loon Creek, 120 miles northeast and reported felt at Anaconda MT, 240 miles NE. Also felt in eastern Oregon.

 

 5 13 14  6  0 1936  46.600 -112.000   0 5.7   Yellowstone/Wyoming

 

Felt strongly at Helena MT.

 

 5 13 16  1 45 1941  40.000 -126.000   0 6.0   Off Coast of No. California

 

Felt strongly along the coast at widely separated points and at 2 towns in Oregon. Maximum intensity V. Cracked plaster at Santa Cruz.  Hanging objects swung at Ferndale.

 

 5 13 16  7 12 1960  54.960 -161.510   0 6.2   Unimak Islands, Aleutians

 5 13 17 50 19 1963  61.100 -151.000  96 5.4   Central Alaska

 5 13  5 18 55 1967  56.450 -152.580  23 5.2   Southern Alaska

 5 13 21 27 56 1971  65.900 -164.000 100 6.1   Northern Alaska

 5 13  5 10 49 1974  55.800 -158.450  36 5.0   Alaska Peninsula

 5 13 14 14 55 1986  51.350 -173.470  33 5.0   Andreanoff Islands, Aleutians

 5 13 17 15 23 1986  51.230 -176.680  33 5.5   Andreanoff Islands, Aleutians

 5 13  4 41 31 1989  54.200 -169.400   0 5.2   Fox Islands, Aleutians

 5 13 10 24 40 1993  61.988 -147.033  59 5.3   Central Alaska

 5 13 11 59 49 1993  55.177 -160.458  32 6.9   Unimak Islands, Aleutians

 

Items knocked from shelves at Sand Point and King Cove. Felt (VI) at Sand Point; (V) at Chignik, Chignik Lagoon, False Pass, King Cove, Nelson Lagoon and Perryville; (IV) at Cold Bay and Port Heiden; (III) at Akhiok and Akutan; (II) at Kodiak.

 

 5 13 23 41 38 1993  55.017 -160.162  33 5.3   Unimak Islands, Aleutians

 5 13 23 11  5 1997  61.240 -150.847  66 5.0   Central Alaska

 5 13 10 06 41 2005  18.866 -155.202  44 5.1   Hawaii

 

(NEIC) Felt (IV) at Captain Cook, Hilo, Honaunau, Kamuela, Keaau, Kurtistown and Pahoa; (III) at Kailua Kona and Waikoloa. Felt throughout the Island of Hawai`i.

 

 5 13 05 35 12 2010  42.263 -126.499  10 5.3   Off Coast of Oregon

 

(NEIC) Felt at Brookings, Eugene, Gold Beach, Medford and Myrtle Point.

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: 11MAY2021 12:22:31  56.7N  118.0E mb=4.6  EMSC   CHITINSKAYA OBLAST', RUSSIA  

P:  6MAY2021 133612    57.0N  121.0E 3.0-4.4 BABAA  So. Siberia                

 

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

 

INDONESIA AND PHILIPPINES

 

O: 12MAY2021 05:39:27   1.1S   95.9E ML=4.1  EMSC   SOUTHWEST OF SUMATRA, INDONESI

P:  9MAY2021 133411     1.0N   97.0E 4.0-5.7 BBAAA  Nicobar Islands            

 

O: 11MAY2021 20:44:42   1.6S   99.4E mb=4.9  EMSC   KEP. MENTAWAI REGION, INDONESI

P:  7MAY2021 133412     0.0N   99.0E 4.0-5.5 BBAAA  So. Sumatera               

 

O: 11MAY2021 17:15:40   2.8N  128.2E ML=4.1  EMSC   HALMAHERA, INDONESIA

O: 11MAY2021 21:11:16   2.2N  128.1E ML=4.5  EMSC   HALMAHERA, INDONESIA         

P: 10MAY2021 133406     4.0N  128.0E 4.0-5.4 ABAAA  Halmahera                  

 

O: 11MAY2021 07:50:21   3.9N  125.9E mb=4.8  EMSC   KEPULAUAN SANGIHE, INDONESIA 

P:  9MAY2021 133409     3.0N  123.0E 4.0-5.7 AACAA  Mindanao, Philippines      

 

O: 11MAY2021 08:47:40   4.2N   95.9E ML=4.2  EMSC   NORTHERN SUMATRA, INDONESIA  

P:  9MAY2021 133411     4.0N   94.0E 4.0-5.8 AABAA  Nicobar Islands            

P: 13MAY2021 133726     4.0N   94.0E 4.0-5.8 AABAA  Nicobar Islands            

 

O: 11MAY2021 15:27:35   5.4S  151.0E Mw=5.4  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 15MAY2021 133739     5.0S  151.0E 4.0-5.4 BAAAA  New Ireland                 

 

O: 11MAY2021 06:33:16   5.7S  153.3E mb=4.9  EMSC   NEW IRELAND REGION, P.N.G.   

P:  9MAY2021 133422     4.0S  154.0E 4.0-5.4 ABAAA  New Britain                

 

O: 12MAY2021 03:02:36   6.8N  126.4E ML=4.8  EMSC   MINDANAO, PHILIPPINES        

P: 11MAY2021 133719     7.0N  126.0E 4.0-5.7 AAAAA  Central Philippines        

 

O: 12MAY2021 01:09:26  13.5N  120.8E Mw=5.7  EMSC   MINDORO, PHILIPPINES         

P: 15MAY2021 133765    12.0N  122.0E 3.5-5.1 BBAAA  Luzon, Philippines         

 

 

CENTRAL AND SOUTH AMERICA

 

O: 11MAY2021 14:41     32.7S   70.1W mb=4.4  GUC    Santiago at San Bernardo, Tilt

P:  8MAY2021 133681    31.0S   72.0W 4.0-5.7 BBBAA  Central Chile              

 

GUC reported this earthquake was felt with intensity   III in  Santiago at San Bernardo, Tiltil; II in Paine, Pedro Aguirre Cerda and Santiago, Chile.

 

O: 11MAY2021 08:43:47   9.7S   75.3W ML=4.4  EMSC   CENTRAL PERU                 

P: 12MAY2021 133741     9.0S   80.0W 4.0-5.8 AACAA  No. Peru                   

 

O: 11MAY2021 08:15:30  10.0N   83.8W ML=4.0  EMSC   COSTA RICA                   

P: 15MAY2021 133755    10.0N   84.0W 3.5-5.2 AAAAA  Caribbean Sea              

 

O: 12MAY2021 06:17:08  13.4N   90.3W Mw=5.6  EMSC   OFFSHORE EL SALVADOR         

O: 12MAY2021 06:18:47  13.3N   90.3W ML=4.7  EMSC   OFFSHORE EL SALVADOR

P:  5MAY2021 133447    14.0N   90.0W 3.5-5.1 CAAAA  Guatemala                  

P: 13MAY2021 133760    13.0N   91.0W 3.5-5.6 AAAAA  Guatemala                  

 

O: 12MAY2021 00:37:07  13.9N   93.8W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P:  9MAY2021 133443    15.0N   93.0W 3.5-5.4 BBAAA  Chiapas, Mexico            

 

O: 12MAY2021 05:18:07  16.5N   95.2W ML=4.0  EMSC   OAXACA, MEXICO

O: 12MAY2021 03:20:31  17.4N   94.9W ML=4.0  EMSC   VERACRUZ, MEXICO

O: 12MAY2021 04:27:19  15.6N   95.0W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 13MAY2021 133757    16.0N   94.0W 3.5-5.2 AAAAA  Chiapas, Mexico            

 

O: 11MAY2021 10:18:04  16.4N   98.5W ML=4.2  EMSC   GUERRERO, MEXICO             

P:  8MAY2021 133462    17.0N  100.0W 3.5-5.3 BABAA  Oaxaca, Mexico             

 

O: 11MAY2021 11:51:01  17.6N   65.6W Md=3.0  EMSC   PUERTO RICO REGION           

P: 10MAY2021 133463    18.0N   66.0W 3.4-5.0 AAAAA  Puerto Rico                

 

O: 12MAY2021 01:09:01  17.9N   67.0W ML=3.6  EMSC   PUERTO RICO REGION           

P: 11MAY2021 133774    18.0N   68.0W 3.4-5.3 AAAAA  Puerto Rico                

 

NEIC reported this earthquake of M 3.6 in Puerto Rico was felt with intensity II-III in the area(s) of Puerto Rico with IV at Lajas, Cabo Rojo, Aguada, and in Ensenada, San German, Las Marias, Barranquitas, San Juan and Fajardo.

 

O: 11MAY2021 14:46:55  21.6S   68.5W mb=4.3  EMSC   ANTOFAGASTA, CHILE           

O: 12MAY2021 04:23:37  22.1S   68.4W mb=4.4  EMSC   ANTOFAGASTA, CHILE

P:  7MAY2021 133658    23.0S   69.0W 4.0-5.6 BBAAA  Coast No. Chile            

 

O: 11MAY2021 14:41:34  32.7S   70.1W mb=4.5  EMSC   MENDOZA, ARGENTINA           

P: 12MAY2021 133958    32.0S   70.0W 4.0-5.8 AAAAA  Central Chile               

 

NEIC reported this earthquake of M 4.5 in Argentina was felt with intensity II-III in the area(s) of  Santiago and San Bernardo, Chile.

 

 

AFRICA AND EUROPE

 

O: 11MAY2021 11:35:12  35.5N    3.7W ML=3.5  EMSC   STRAIT OF GIBRALTAR

O: 11MAY2021 16:52:03  35.5N    3.7W ML=3.7  EMSC   STRAIT OF GIBRALTAR          

P: 12MAY2021 133824    35.0N    4.0W 3.5-4.9 AAAAA  Morocco/Spain              

 

O: 12MAY2021 00:13:59  35.6N    8.9W ML=3.7  EMSC   WEST OF GIBRALTAR            

P:  3MAY2021 133515    37.0N    6.0W 3.5-4.9 CBBAA  Morocco/Spain              

 

O: 11MAY2021 16:28:27  36.8N    3.5E mb=3.5  EMSC   NORTHERN ALGERIA             

P:  7MAY2021 133551    37.0N    3.0E 3.0-4.5 BAAAA  Western Mediterranean      

 

O: 11MAY2021 10:27:46  71.1N    9.4W ML=3.4  EMSC   JAN MAYEN ISLAND REGION      

P:  8MAY2021 133634    71.0N    8.0W 3.5-5.4 BAAAA  Jan Mayen Isl. area        

 

O: 11MAY2021 21:31:02  40.5N   21.1E Mw=4.7  EMSC   GREECE                       

P: 11MAY2021 133827    39.0N   20.0E 3.0-4.4 ABAAA  No. Greece                 

 

SOUTHWEST PACIFIC

 

O: 11MAY2021 09:21:10  16.5S  177.5W mb=5.3  EMSC   FIJI REGION                  

P:  8MAY2021 133646    16.0S  176.0W 4.0-5.7 BABAA  Tonga Islands              

P: 14MAY2021 133940    17.0S  177.0W 4.0-5.7 BAAAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 11MAY2021 20:06:31  79.1N  124.9E mb=4.7  EMSC   EAST OF SEVERNAYA ZEMLYA     

P: 16MAY2021 133930    82.0N  119.0E 4.0-5.4 BCAAA  Arctic Ocean Region        

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 11MAY2021 15:10:19  37.5S  179.7E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  8MAY2021 133694    37.0S  178.0E 3.0-4.4 BABAA  North Island, N.Z.          

P: 14MAY2021 133961    38.0S  178.0E 3.0-4.7 BABAA  North Island, N.Z.         

 

No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia

today. GeoNet did not report any felt events in the area.

 

JAPAN AND KURIL ISLANDS

 

O: 12MAY2021 03:46:57  32.5N  141.4E mb=4.9  EMSC   IZU ISLANDS, JAPAN REGION    

P:  7MAY2021 133524    32.0N  142.0E 4.0-5.6 BAAAA  Off East Coast Honshu      

P: 11MAY2021 133832    32.0N  142.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

 

O: 11MAY2021 23:30:05  40.3N  142.2E mb=4.5  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  9MAY2021 133525    39.0N  141.0E 4.0-5.4 ABAAA  Off East Coast Honshu      

P: 14MAY2021 133863    41.0N  143.0E 3.5-5.4 BAAAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 11MAY2021 12:53:00  32.8N  115.8W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 11MAY2021 12:59:56  32.8N  115.8W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 12MAY2021 00:10:44  32.6N  115.6W Ml=2.0  EMSC   BAJA CALIFORNIA, MEXICO      

O: 11MAY2021 12:40:05  32.8N  115.8W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P:  7MAY2021 133530    33.0N  115.9W 2.5-4.4 BAAAA  So. California             

P: 13MAY2021 133837    32.9N  115.6W 2.5-4.4 AAAAA  So. California             

 

O: 11MAY2021 11:48:11  34.0N  117.2W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALI

P:  5MAY2021 133535    34.1N  117.4W 2.5-4.8 CAAAA  So. California             

 

O: 11MAY2021 16:08:29  36.1N  117.8W Ml=2.2  EMSC   CENTRAL CALIFORNIA           

P:  9MAY2021 133491    36.2N  117.9W 2.5-5.1 AAAAA  California/Nevada area     

 

O: 11MAY2021 09:11:20  37.4N  119.6W Md=2.0  EMSC   CENTRAL CALIFORNIA           

P:  7MAY2021 133495    37.5N  118.6W 2.5-4.6 BAAAA  California/Nevada area     

 

O: 12MAY2021 04:18:27  38.2N  117.9W ml=2.1  EMSC   NEVADA                       

P: 12MAY2021 133804    37.9N  118.2W 2.5-4.5 AAAAA  California/Nevada area     

 

O: 11MAY2021 15:38:29  40.0N  122.7W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P:  9MAY2021 133575    40.6N  122.4W 2.5-4.4 AAAAA  Northern California        

 

 

ALASKA

 

O: 11MAY2021 10:18:12  66.9N  145.9W ml=3.0  EMSC   NORTHERN ALASKA              

P: 14MAY2021 133923    69.0N  144.0W 3.0-4.9 BBAAA  Northern Alaska            

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 11MAY2021 23:43:09  44.1N  130.6W ML=3.7  EMSC   OFF COAST OF OREGON          

P:  9MAY2021 133578    44.5N  129.8W 3.0-4.5 AAAAA  Off Coast of Oregon        

 

O: 11MAY2021 20:48:31  47.0N  122.2W Md=2.0  EMSC   PUGET SOUND REGION, WASHINGTON

P: 11MAY2021 133888    47.5N  121.8W 2.0-4.1 AAAAA  Washington state, U.S.     

 

O: 10MAY2021 00:53:43  54.5N  118.5W MB=3.4  ECAN Grande Cache, AB               

P: 10MAY2021 133594    56.0N  120.0W 2.0-4.1 ABAAA  Alberta                    

 

ROCKY MOUNTAINS REGION

 

O: 11MAY2021 18:00:15  31.7N  104.4W ML=2.5  EMSC   WESTERN TEXAS

O: 11MAY2021 19:07:13  31.7N  104.3W ML=3.4  EMSC   WESTERN TEXAS

O: 11MAY2021 10:44:06  31.7N  104.4W ML=3.1  EMSC   WESTERN TEXAS                

P:  8MAY2021 133528    32.5N  103.6W 2.0-3.9 AAAAA  SW U.S.A                   

 

O: 12MAY2021 02:16:37  32.0N  102.4W mb=2.4  EMSC   WESTERN TEXAS                

P:  8MAY2021 133528    32.5N  103.6W 2.0-3.9 BAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 11MAY2021 10:15:27  34.8N   97.8W ML=2.2  EMSC   OKLAHOMA

O: 11MAY2021 08:21:25  35.0N   97.8W mb=2.7  EMSC   OKLAHOMA

O: 11MAY2021 20:27:34  34.4N   97.4W ML=2.2  EMSC   OKLAHOMA                     

P:  7MAY2021 133545    34.0N   97.0W 2.0-3.9 BAAAA  Southeast U.S.              

 

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 Alex, Amber, Bradley and III in Chickasha.

 

O: 12MAY2021 02:39:54  36.1N   92.8W mb=2.1  EMSC   ARKANSAS                     

P:  4MAY2021 133517    35.0N   92.0W 2.0-4.2 CBAAA  New Madrid area            

 

O: 12MAY2021 01:45:39  49.5N   67.1W MB=1.5  ECAN Port-Cartier, QC               

P:  5MAY2021 133558    49.0N   66.0W 2.0-3.9 AAAAA  E. of Maine                

 

O: 11MAY2021 04:37:56  47.7N   70.0W MB=1.3  ECAN Charlevoix Seismic Zone     

O: 10MAY2021 13:39:08  47.4N   70.4W MB=1.9  ECAN  Charlevoix Seismic Zone    

O: 11MAY2021 09:45:48  47.8N   69.8W MB=1.6  ECAN Charlevoix Seismic Zone        

P: 11MAY2021 133874    47.3N   70.5W 2.0-3.9 AAAAA  New England                

P: 13MAY2021 133868    47.0N   69.0W 2.0-3.9 AAAAA  Maine                      

 

HAWAII

 

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

 

MODERATE QUAKES IN KURIL ISLANDS

 

EARTHQUAKE SUMMARY FOR  MAY 9, 2021

 

It was a quiet day in global seismicity. The largest earthquakes of the day were located with M 5.0 in the Kuril Islands and Tonga. The events in the Kuril Islands were the most active in the world today with four other additional moderate quakes in the area. These were not reported felt. The M 5.0 in the Kuril Islands is the strongest in the Kurils since an M 5.1 on March 20, 2021. Forecasts 133585, 133559 and 133570 expected this activity was likely in early May.

 

O: 09MAY2021 16:05:00  47.4N  151.6E mb=4.4  EMSC   KURIL ISLANDS

O:  9MAY2021 23:33:37  46.6N  152.1E mb=5.0  EMSC   KURIL ISLANDS                

P:  4MAY2021 133585    48.0N  154.0E 3.5-5.8 BABAA  So. Kurils                  

 

O: 10MAY2021 00:39:51  43.9N  146.7E mb=4.5  EMSC   KURIL ISLANDS                

P:  8MAY2021 133559    44.0N  145.0E 3.5-5.6 AAAAA  Hokkaido, Japan            

 

O:  9MAY2021 16:23:45  49.4N  155.8E mb=4.8  EMSC   KURIL ISLANDS                

P:  7MAY2021 133570    49.0N  155.0E 3.5-5.8 AAAAA  NE Pacific                 

 

The M 5.0 in the Tonga Islands was reported felt in that area. NEIC reported this earthquake of M 5.0 in Tonga was felt with intensity II-III in the area(s) of Tonga in Neiafu, Vavau. This area has been active in the past week and has included events of M 6.1 and 5.5 in the past week. Today's M 5.0 is not a classical aftershock of the M 6.1 on May 7 as it occurred about 400 km northeast of that event. Forecast 133647 expected the M 5.0 in Tonga today was likely around May 8. 

 

O: 10MAY2021 01:59:17  17.8S  173.6W mb=5.0  EMSC   TONGA                        

P:  8MAY2021 133647    18.0S  178.0W 4.0-5.7 AACAA  Tonga Islands              

 

Two light earthquakes were felt today in the Los Angeles, California area. These occurred within about half an hour of each other. These began with an M 3.2  near local solar midnight and was followed half an hour later by an M 2.5 in the Santa Monica Bay area of California. The may signal a more active period in  the Los Angeles area and resembles some of the precursory activity in the area prior to the Northridge quake of January, 1994. Forecasts 133536 and 133531 expected this activity in early May in this area.

 

NEIC reported the earthquake of M 2.5 in Santa Monica Bay, California was felt with intensity II-III in the area(s) of Santa Monica Bay, California at Hermosa Beach, Manhattan Beach, Redondo Beach, El Segundo, Torrance, Lawndale, Hawthorne and Palos Verdes.  NEIC reported the earthquake of M 3.2 in eastern Los Angeles, California was felt with intensity II-III in the area(s) of eastern Los Angeles, California at Loma Linda, Grand Terrace, Colton, Redlands, San Bernardino, Moreno Valley, Highland.

 

O:  9MAY2021 09:37:57  33.9N  118.5W Ml=2.5  EMSC   SANTA MONICA BAY, CALIFORNIA 

O:  9MAY2021 09:09:33  34.0N  117.2W ML=3.2  EMSC   GREATER LOS ANGELES AREA, CALI

P:  5MAY2021 133535    34.1N  117.4W 2.5-4.8 BAAAA  So. California             

P:  7MAY2021 133531    33.8N  117.7W 2.5-4.7 AAAAA  So. 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:  9MAY2021 18:41:23  26.8N   92.5E mb=3.8  EMSC   ASSAM, INDIA                 

P:  3MAY2021 133478    27.0N   92.0E 4.0-5.5 CAAAA  Myanmar                    

 

NEIC reported this earthquake of M 3.8 in Assam, India was felt with intensity II-III in the area(s) of Assam, India at Gauhati.

 

O: 10MAY2021 00:36:08  51.4N  100.4E mb=4.3  EMSC   RUSSIA-MONGOLIA BORDER REGION

P:  1MAY2021 133611    51.0N   98.0E 3.0-4.7 CABAA  So. Siberia                

 

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

 

INDONESIA AND PHILIPPINES

 

O: 10MAY2021 05:38:05   0.1N  124.2E ML=4.3  EMSC   MINAHASA, SULAWESI, INDONESIA

P:  9MAY2021 133398     1.0N  122.0E 4.0-5.5 AABAA  Celebes Sea                

 

O:  9MAY2021 22:14:08   0.2S  131.9E ML=4.3  EMSC   NEAR N COAST OF PAPUA, INDONES

P:  6MAY2021 133435     1.0S  133.0E 4.0-5.5 BAAAA  West Irian, PNG            

 

O:  9MAY2021 19:08:15   1.6N  126.3E ML=4.3  EMSC   MOLUCCA SEA                  

P:  3MAY2021 133406     1.0N  128.0E 4.0-5.5 CABAA  Halmahera                  

 

O:  9MAY2021 17:51:41   2.4S  138.4E ML=4.2  EMSC   PAPUA, INDONESIA             

P: 10MAY2021 133436     3.0S  139.0E 4.0-5.5 AAAAA  West Irian, PNG            

 

O:  9MAY2021 20:22:44   4.9S  153.6E mb=4.5  EMSC   NEW IRELAND REGION, P.N.G.   

P:  9MAY2021 133422     4.0S  154.0E 4.0-5.4 AAAAA  New Britain                

 

O: 10MAY2021 04:18:47   6.0N  126.2E ML=4.8  EMSC   MINDANAO, PHILIPPINES        

P: 10MAY2021 133401     7.0N  126.0E 4.0-5.7 AAAAA  Central Philippines         

 

O:  9MAY2021 18:09:28   7.7S  107.3E ML=4.3  EMSC   JAVA, INDONESIA              

P:  7MAY2021 133645    10.0S  107.0E 4.0-5.6 ACAAA  So. of Java                

 

O:  9MAY2021 14:14:12   7.9N  127.0E ML=4.6  EMSC   MINDANAO, PHILIPPINES         

P: 10MAY2021 133401     7.0N  126.0E 4.0-5.7 AAAAA  Central Philippines        

 

O:  9MAY2021 09:42:47  10.9S  114.9E mb=4.6  EMSC   SOUTH OF BALI, INDONESIA     

P:  7MAY2021 133430     9.0S  114.0E 4.0-5.6 ABAAA  So. of Bali                

 

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

 

CENTRAL AND SOUTH AMERICA

 

O: 10MAY2021 04:46:15  16.7N   95.4W ML=4.0  EMSC   OAXACA, MEXICO               

P:  5MAY2021 133444    16.0N   95.0W 3.5-5.1 BAAAA  Chiapas, Mexico            

 

O: 09MAY2021 18:55:42  14.7N   93.4W ML=4.1  EMSC   OFFSHORE CHIAPAS, MEXICO

O:  9MAY2021 11:57:00  14.2N   93.4W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P:  9MAY2021 133443    15.0N   93.0W 3.5-5.4 AAAAA  Chiapas, Mexico             

 

O: 10MAY2021 06:30:15   8.3S   76.4W ML=4.3  EMSC   CENTRAL PERU                 

P:  1MAY2021 133426     6.0S   76.0W 4.0-5.4 CCAAA  No. Peru                   

P:  8MAY2021 133427     6.0S   79.0W 4.0-5.5 ACCAA  No. Peru                    

 

O:  9MAY2021 21:58:04   7.8S   74.3W ML=4.0  EMSC   NORTHERN PERU                

P:  1MAY2021 133415     8.0S   74.0W 3.5-5.1 CAAAA  Brazil                     

 

O:  9MAY2021 19:28:32   4.0N   71.5W mb=4.5  EMSC   COLOMBIA                     

P:  9MAY2021 133402     7.0N   73.0W 4.0-5.4 ACBAA  Colombia                   

 

O:  9MAY2021 10:52:21  18.1N   71.4W ML=3.6  EMSC   DOMINICAN REPUBLIC           

P:  7MAY2021 133469    20.0N   71.0W 3.0-4.9 ABAAA  Bahamas/No. Caribbean      

 

O:  9MAY2021 15:46:01  18.8N  103.8W ML=4.0  EMSC   COLIMA, MEXICO               

 

O:  9MAY2021 14:44:32  27.8S   71.4W mb=4.4  EMSC   OFFSHORE ATACAMA, CHILE      

P:  7MAY2021 133656    29.0S   71.0W 4.0-5.5 ABAAA  Coast Central Chile        

 

 

AFRICA AND EUROPE

 

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

 

SOUTHWEST PACIFIC

 

O: 10MAY2021 06:39:37  14.8S  167.8E mb=4.4  EMSC   VANUATU                      

P:  6MAY2021 133649    15.0S  167.0E 4.0-5.4 BAAAA  Vanuatu Islands             

 

O: 10MAY2021 01:59:17  17.8S  173.6W mb=5.0  EMSC   TONGA                        

P:  8MAY2021 133647    18.0S  178.0W 4.0-5.7 AACAA  Tonga Islands              

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  9MAY2021 20:32:14  45.5S  167.1E ML=4.2  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 09MAY2021 20:32:13  45.4S  167.0E MS=4.4  GEONET Felt with weak intensity

P:  4MAY2021 133707    46.0S  167.0E 3.0-5.1 BAAAA  Southern S. Isl. N.Z.      

 

GEONET reported this earthquake was felt with weak intensity in the area southwest of Haast, South Island. 17 reports of felt intensity came from the area east and north of the epicenter. More than 17 people reported feeling this earthquake with 17 reporting weak shaking and 0 light intensity; 0 with moderate intensity and none each with strong, severe and none with extreme shaking.

 

JAPAN AND KURIL ISLANDS

 

O: 09MAY2021 16:05:00  47.4N  151.6E mb=4.4  EMSC   KURIL ISLANDS

O:  9MAY2021 23:33:37  46.6N  152.1E mb=5.0  EMSC   KURIL ISLANDS                

P:  4MAY2021 133585    48.0N  154.0E 3.5-5.8 BABAA  So. Kurils                 

 

O: 10MAY2021 00:39:51  43.9N  146.7E mb=4.5  EMSC   KURIL ISLANDS                

P:  8MAY2021 133559    44.0N  145.0E 3.5-5.6 AAAAA  Hokkaido, Japan            

 

O:  9MAY2021 16:23:45  49.4N  155.8E mb=4.8  EMSC   KURIL ISLANDS                

P:  7MAY2021 133570    49.0N  155.0E 3.5-5.8 AAAAA  NE Pacific                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 10MAY2021 04:34:47  32.6N  115.6W Ml=2.0  EMSC   BAJA CALIFORNIA, MEXICO

O: 10MAY2021 01:20:25  32.6N  115.6W Ml=2.1  EMSC   BAJA CALIFORNIA, MEXICO      

P:  7MAY2021 133530    33.0N  115.9W 2.5-4.4 BAAAA  So. California              

 

O:  9MAY2021 09:37:57  33.9N  118.5W Ml=2.5  EMSC   SANTA MONICA BAY, CALIFORNIA 

O:  9MAY2021 09:09:33  34.0N  117.2W ML=3.2  EMSC   GREATER LOS ANGELES AREA, CALI

P:  5MAY2021 133535    34.1N  117.4W 2.5-4.8 BAAAA  So. California              

P:  7MAY2021 133531    33.8N  117.7W 2.5-4.7 AAAAA  So. California             

 

O: 09MAY2021 19:26:11  38.2N  118.0W ML=3.1  EMSC   NEVADA

O: 09MAY2021 19:26:11  38.2N  118.0W ML=3.6  ANSS   NEVADA

O: 09MAY2021 22:54:40  38.2N  118.0W ml=2.2  EMSC   NEVADA

O:  9MAY2021 09:33:24  38.1N  118.8W Md=2.2  EMSC   CENTRAL CALIFORNIA           

O: 09MAY2021 13:16:14  38.1N  118.8W ML=3.1  EMSC   CENTRAL CALIFORNIA

P:  7MAY2021 133494    38.3N  119.3W 2.5-4.6 AAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 3.6 in Western Nevada was felt with intensity II-III in the area(s) of Western Nevada in Silver Springs, Glenbrook, Reno and in Auburn, California.

 

O:  9MAY2021 16:56:26  38.2N  117.9W ml=2.4  EMSC   NEVADA                       

P:  7MAY2021 133495    37.5N  118.6W 2.5-4.6 AAAAA  California/Nevada area     

 

O: 10MAY2021 00:19:50  39.2N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P: 10MAY2021 133501    38.5N  122.7W 2.5-4.6 AAAAA  Central California         

 

O: 10MAY2021 01:18:18  39.4N  123.3W Md=2.2  EMSC   NORTHERN CALIFORNIA          

O: 10MAY2021 01:18:18  39.4N  123.3W Md=2.2  EMSC   NORTHERN CALIFORNIA

P:  9MAY2021 133502    39.7N  123.7W 2.5-4.4 AAAAA  Central California         

 

 

ALASKA

 

O:  9MAY2021 19:43:45  54.2N  162.8W ML=3.3  EMSC   ALASKA PENINSULA             

P:  5MAY2021 133614    54.5N  161.8W 3.5-5.3 BAAAA  Unimak Islands, Aleutians  

 

O:  9MAY2021 07:04:29  55.9N  153.1W ML=3.1  EMSC   SOUTH OF ALASKA              

P:  5MAY2021 133626    54.9N  149.8W 3.0-4.6 BABAA  Northern Alaska            

 

O:  9MAY2021 23:33:59  56.2N  158.0W ML=3.4  EMSC   ALASKA PENINSULA             

P:  9MAY2021 133593    54.8N  158.7W 3.5-5.1 ABAAA  Alaska Peninsula           

 

O:  9MAY2021 15:03:35  62.6N  152.1W ML=3.4  EMSC   CENTRAL ALASKA               

P:  5MAY2021 133620    62.7N  151.6W 3.2-5.0 BAAAA  Central Alaska             

 

O:  9MAY2021 19:31:40  67.6N  159.0W ML=3.1  EMSC   NORTHERN ALASKA              

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  9MAY2021 19:23:40  47.5N  122.6W Ml=2.5  EMSC   SEATTLE-TACOMA AREA, WASHINGTO

P:  4MAY2021 133589    48.4N  123.2W 2.0-4.1 BAAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O: 09MAY2021 15:00:09  31.7N  104.6W ML=2.9  EMSC   WESTERN TEXAS

O:  9MAY2021 07:47:30  31.7N  104.4W mb=2.8  EMSC   WESTERN TEXAS                

P:  5MAY2021 133528    32.0N  104.6W 2.0-3.9 BAAAA  SW U.S.A                   

P:  8MAY2021 133528    32.5N  103.6W 2.0-3.9 AAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 10MAY2021 06:04:10  34.0N   97.3W ML=2.7  EMSC   OKLAHOMA                     

P:  7MAY2021 133545    34.0N   97.0W 2.0-3.9 BAAAA  Southeast U.S.             

 

O:  9MAY2021 10:43:53  38.7N   97.0W mb=2.5  EMSC   KANSAS                       

P:  4MAY2021 133547    39.0N   99.0W 2.0-4.3 BABAA  Southern Plains            

 

O:  9MAY2021 06:36:44  48.8N   67.9W MB=1.8  ECAN Saint-Damase, QC               

P:  5MAY2021 133558    49.0N   66.0W 2.0-3.9 BABAA  E. of Maine                

 

HAWAII

 

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

 

MODERATE QUAKE SHAKES YUKON TERRITORY, CANADA

 

EARTHQUAKE SUMMARY FOR  MAY 8, 2021

 

The strongest earthquake in the U.S. or Canada today was an M 4.6-4.9 in the Yukon Territory, Canada. This is the strongest earthquake within about 250 km of this epicenter since an M 5.3 about 250 km northwest of today's epicenter occurred on February 13. 2017. An M 6.0 hit about 100 km south of this on July 17, 2014. Forecast 133621 had expected elevated seismicity in this region was likely around May 6. This earthquake was located at the seventh node (51.4 degrees) from the M 7.1, 7.2 and 6.8 in Honshu Japan in March and April and was probably promoted by energy from those sources.  It is also located at 104 degrees from the M 7.3 off North Island, New Zealand of March 4 and was probably promoted by energy from that source.

 

O:  9MAY2021 02:03:44  61.4N  141.0W MB=4.6  ECAN  BEAVER CREEK, YT            

O:  9MAY2021 02:03:46  61.5N  140.6W mb=4.9  EMSC   SOUTHERN YUKON TERRITORY, CANA

O:  9MAY2021 02:03:46  61.5N  140.5W mb=4.9  ANSS   SOUTHERN YUKON TERRITORY, CANA

P:  6MAY2021 133621    62.8N  143.8W 3.2-5.3 BBBAA  Central Alaska             

 

The strongest earthquake in the U.S. or Canada today outside Alaska was and M 4.4 in western Nevada. NEIC reported it was felt with intensity II-III in Nevada at Glenbrook and Fallon and in Carson City. A similar M 4.4 occurred about 25 km west of this on March 30, 2021 but the last event in the area of larger magnitude was an M 4.7 on December 14, 2020. Forecast 133495 expected enhanced activity in this area was likely around May 4 to May 7, 2021. This event is located at the fourth node (90 degrees) from the M 7.7 in the Loyalty Islands of February 10 and at the fifth node (72 degrees) recent major events off eastern Honshu, Japan and was probably promoted by energy from those sources.

 

O: 08MAY2021 13:07:02  38.2N  117.9W ml=2.3  EMSC   NEVADA

O: 08MAY2021 13:07:02  38.2N  117.9W ml=2.3  EMSC   NEVADA

O: 08MAY2021 15:31:26  38.2N  117.9W ml=2.0  EMSC   NEVADA

O:  8MAY2021 08:13:52  38.2N  117.9W Mw=4.1  EMSC   NEVADA                       

O:  8MAY2021 08:13:52  38.2N  117.9W Mw=4.4  ANSS   NEVADA                       

P:  4MAY2021 133495    38.0N  118.8W 2.5-4.6 BAAAA  California/Nevada area     

P:  7MAY2021 133495    37.5N  118.6W 2.5-4.6 AAAAA  California/Nevada area     

 

An M 3.8 also occurred today off the coast of Oregon. It may have been felt lightly on the coast of Oregon at Hillsboro. This continues the enhanced seismicity in this area which began with an M 4.1 on April 26, 2021 with an M 5.4, 5.3 and 5.2 on April 29. Forecast 133578 expected this event was likely around 133578 around May 9.

 

O:  8MAY2021 08:37:00  44.2N  129.2W mb=3.8  EMSC   OFF COAST OF OREGON          

P:  9MAY2021 133578    44.5N  129.8W 3.0-4.5 AAAAA  Off Coast of Oregon        

 

The strongest earthquake in the world today was an M 5.1 in the South Sandwich Islands. It was not reported felt in this remote region. While earthquakes of M 5.0 and M 5.3 occurred about 200 km southeast of this on May 7 and April 26, 2021, the last event of M>=5.1 within this distance of today's epicenter occurred on February 23, 2021 with M 5.2. The last of significantly large magnitude in this area was an M 5.4 on May 8, 2020 exactly one year ago. Forecast 133712 had expected today's event within about 50 km in early May.

 

O:  8MAY2021 18:17:38  55.6S   29.2W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  3MAY2021 133712    55.0S   29.0W 4.0-6.0 BAAAA  So. Sandwich Islands       

P:  9MAY2021 133712    57.0S   27.0W 4.0-6.0 ABBAA  So. Sandwich Islands       

 

An earthquake of M 4.5 continued the aftershocks in Gabon, West Africa today.

NEIC reported this earthquake of M 4.5 in Lambarene, Gabon was felt with intensity II-III in the area(s) of Lambarene, Gabon. The mainshocks in this area were an 5.2 on March 6 and an M 5.4 on March 9, 2021. Aftershocks of M 5.4 and 4.7 occurred on April 27. At the time this summary noted in this regard:

 

"A pair of moderate aftershocks occurred in the region of Gabon, West Africa today. These are aftershocks of the M 5.2 and 5.4 in the area of March 6 and 9, 2021 and are the largest since those events occurred. They occurred near local solar midnight and may have been promoted by high tidal stresses with the full moon. The activity in Gabon is near 144 degrees from the M 8.1 in the Kermadec  Islands of March 5 and is probably promoted by energy from that source." (April 26, 2021)

 

 

O:  9MAY2021 01:30:07   1.2S   10.1E mb=4.5  EMSC   GABON                        

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:  8MAY2021 07:50:19  24.3N   77.6E ML=4.3  EMSC   MADHYA PRADESH, INDIA        

P:  5MAY2021 133511    30.0N   79.0E 3.8-5.3 BCBAA  India                      

 

O:  8MAY2021 21:46:40  29.8N   50.5E mb=4.2  EMSC   SOUTHERN IRAN                

P:  2MAY2021 133483    29.0N   53.0E 3.5-5.0 CABAA  So. Iran/Persian Gulf      

 

NEIC reported this earthquake of M 4.2 in Iran  was felt with intensity II-III in the area(s) of  Iran at Bandar-e Genaveh.

 

O:  9MAY2021 01:53:36  37.2N   71.7E mb=4.4  EMSC   TAJIKISTAN                   

P:  7MAY2021 133509    37.0N   72.0E 3.8-5.4 AAAAA  Hindu Kush/Pakistan        

 

O:  8MAY2021 14:07:32  41.2N   84.0E mb=4.3  EMSC   SOUTHERN XINJIANG, CHINA     

P:  5MAY2021 133563    42.0N   83.0E 4.0-5.4 BAAAA  Kirgizstan/Xinjiang        

 

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

 

INDONESIA AND PHILIPPINES

 

O:  9MAY2021 03:19:27   3.9S  131.2E mb=4.4  EMSC   CERAM SEA, INDONESIA         

P:  6MAY2021 133435     3.0S  134.0E 4.0-5.6 BACAA  West Irian, PNG            

 

O:  8MAY2021 11:29:31   4.2S  102.4E mb=4.4  EMSC   SOUTHERN SUMATRA, INDONESIA  

P:  9MAY2021 133431     5.0S  102.0E 4.0-5.6 AAAAA  So. of Sumatera            

 

O:  8MAY2021 15:42:26   4.4S  138.9E ML=4.3  EMSC   PAPUA, INDONESIA             

P:  9MAY2021 133429     4.0S  141.0E 4.0-5.4 AABAA  Papua New Guinea           

P: 10MAY2021 133436     3.0S  139.0E 4.0-5.5 ABAAA  West Irian, PNG            

 

O:  9MAY2021 05:42:36   6.2S  154.6E mb=4.9  EMSC   BOUGAINVILLE REGION, P.N.G.  

P:  5MAY2021 133432     7.0S  155.0E 4.0-5.4 BAAAA  Solomon Islands            

P:  9MAY2021 133422     4.0S  154.0E 4.0-5.4 ACAAA  New Britain                

 

O:  8MAY2021 07:47:03   6.8S  130.0E mb=4.4  EMSC   BANDA SEA                    

P:  9MAY2021 133438     6.0S  130.0E 4.0-5.6 AAAAA  West Irian, PNG            

 

O:  8MAY2021 08:38:38   8.6N  126.8E mb=4.5  EMSC   MINDANAO, PHILIPPINES        

P:  5MAY2021 133407     8.0N  127.0E 4.0-5.7 BAAAA  Halmahera                  

 

O:  9MAY2021 04:19:06   8.6S  118.4E ML=4.2  EMSC   SUMBAWA REGION, INDONESIA    

P:  8MAY2021 133434     9.0S  118.0E 4.0-5.4 AAAAA  Sumbawa Island area        

 

O:  8MAY2021 17:01:57  24.7S  177.6W mb=4.7  EMSC   SOUTH OF FIJI ISLANDS        

P:  7MAY2021 133675    25.0S  177.0W 4.0-5.6 AAAAA  Tonga Islands               

 

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

 

CENTRAL AND SOUTH AMERICA

 

O:  8MAY2021 19:42:03   8.9S   80.1W mb=4.8  EMSC   OFF COAST OF NORTHERN PERU   

P:  3MAY2021 133427     9.0S   81.0W 4.0-5.8 BAAAA  No. Peru                   

 

O: 08MAY2021 18:59:50  15.5N   95.2W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 08MAY2021 21:15:15  15.7N   94.4W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O:  8MAY2021 15:06:31  15.2N   94.2W ML=4.1  EMSC   OFFSHORE CHIAPAS, MEXICO     

P:  9MAY2021 133443    15.0N   93.0W 3.5-5.4 AAAAA  Chiapas, Mexico            

 

O:  8MAY2021 12:31:28  15.8N   60.9W mb=4.0  EMSC   GUADELOUPE REGION, LEEWARD ISL

P:  9MAY2021 133449    15.0N   60.0W 3.0-5.0 AAAAA  Leeward Islands             

 

O:  8MAY2021 12:38:19  16.2N  100.3W ML=4.2  EMSC   OFFSHORE GUERRERO, MEXICO    

P:  6MAY2021 133461    16.0N  100.0W 3.5-5.3 AAAAA  Oaxaca, Mexico             

P:  8MAY2021 133462    17.0N  100.0W 3.5-5.3 AAAAA  Oaxaca, Mexico             

 

O:  8MAY2021 21:52:16  18.0N  103.6W ML=4.1  EMSC   OFFSHORE MICHOACAN, MEXICO   

P:  5MAY2021 133454    18.0N  104.0W 3.5-5.6 BAAAA  Michoacan, Mexico          

 

O: 09MAY2021 01:45:37  18.0N   67.0W Md=3.0  EMSC   PUERTO RICO REGION

O: 09MAY2021 05:34:49  18.0N   67.0W Md=3.0  EMSC   PUERTO RICO REGION

O:  9MAY2021 01:27:13  17.9N   67.0W Md=3.0  EMSC   PUERTO RICO REGION           

O:  8MAY2021 16:55:29  18.9N   67.5W Md=3.1  EMSC   PUERTO RICO REGION           

P:  7MAY2021 133464    18.0N   69.0W 3.4-5.3 AABAA  Puerto Rico                

 

O: 09MAY2021 06:24:28  18.2N   68.3W ML=3.0  EMSC   MONA PASSAGE, DOMINICAN REPUBLIC

O: 08MAY2021 12:45:44  18.8N   68.0W ML=3.0  EMSC   DOMINICAN REPUBLIC REGION

O:  9MAY2021 04:14:45  19.1N   67.3W ML=3.3  EMSC   PUERTO RICO REGION           

P:  5MAY2021 133469    20.0N   68.0W 3.0-4.7 BAAAA  Bahamas/No. Caribbean      

 

AFRICA AND EUROPE

 

O:  9MAY2021 01:30:07   1.2S   10.1E mb=4.5  EMSC   GABON                        

 

O:  8MAY2021 11:41:44  36.5N   27.2E mb=4.3  EMSC   DODECANESE IS.-TURKEY BORDER R

P:  6MAY2021 133488    37.0N   27.0E 3.0-4.8 AAAAA  Aegean Sea                 

 

NEIC reported this earthquake of M 4.3 in the Dodecanese Islands was felt with intensity II-III in the area(s) of the Dodecanese Islands at Kardamaina.

 

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:  8MAY2021 18:17:38  55.6S   29.2W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  3MAY2021 133712    55.0S   29.0W 4.0-6.0 BAAAA  So. Sandwich Islands       

P:  9MAY2021 133712    57.0S   27.0W 4.0-6.0 ABBAA  So. Sandwich Islands       

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  8MAY2021 13:05:45  38.5S  175.9E ML=3.6  EMSC   NORTH ISLAND OF NEW ZEALAND  

P:  4MAY2021 133696    39.0S  176.0E 3.0-4.5 BAAAA  North Island, N.Z.         

 

No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia

today. GeoNet did not report any felt events in the area.

 

JAPAN AND KURIL ISLANDS

 

O:  8MAY2021 16:57:28  36.6N  141.8E mb=4.4  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  6MAY2021 133525    38.0N  142.0E 4.0-5.5 ABAAA  Off East Coast Honshu      

 

O:  8MAY2021 12:07:39  32.0N  140.5E mb=4.7  EMSC   IZU ISLANDS, JAPAN REGION    

P:  7MAY2021 133524    32.0N  142.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 08MAY2021 13:07:02  38.2N  117.9W ml=2.3  EMSC   NEVADA

O: 08MAY2021 13:07:02  38.2N  117.9W ml=2.3  EMSC   NEVADA

O: 08MAY2021 15:31:26  38.2N  117.9W ml=2.0  EMSC   NEVADA

O:  8MAY2021 08:13:52  38.2N  117.9W Mw=4.1  EMSC   NEVADA                       

O:  8MAY2021 08:13:52  38.2N  117.9W Mw=4.4  ANSS   NEVADA                        

P:  4MAY2021 133495    38.0N  118.8W 2.5-4.6 BAAAA  California/Nevada area     

P:  7MAY2021 133495    37.5N  118.6W 2.5-4.6 AAAAA  California/Nevada area     

 

O: 08MAY2021 22:28:11  32.6N  115.3W Ml=2.2  EMSC   BAJA CALIFORNIA, MEXICO

O:  8MAY2021 17:39:42  32.6N  115.3W Ml=2.1  EMSC   BAJA CALIFORNIA, MEXICO      

P:  7MAY2021 133530    33.0N  115.9W 2.5-4.4 AAAAA  So. California             

 

O:  9MAY2021 01:55:39  33.8N  118.4W ML=3.4  EMSC   GREATER LOS ANGELES AREA, CALI

P:  4MAY2021 133534    34.3N  118.5W 2.5-5.2 BAAAA  So. California             

 

NEIC reported this earthquake of M 3.5 in Santa Monica, California was felt with intensity II-III in the area(s) of Santa Monica, California in Hermosa Beach (IV), Manhattan Beach, Redondo Beach, Torrance, El Segundo, Lawndale, Palos Verdes, and Hawthorne.

 

O:  8MAY2021 17:01:49  34.3N  116.4W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P:  9MAY2021 133538    35.1N  117.0W 2.5-4.8 AAAAA  So. California             

 

O:  9MAY2021 02:04:40  36.0N  117.8W Ml=2.1  EMSC   CENTRAL CALIFORNIA           

P:  9MAY2021 133491    36.2N  117.9W 2.5-5.1 AAAAA  California/Nevada area     

 

O:  9MAY2021 06:34:16  37.3N  120.0W Md=2.6  EMSC   CENTRAL CALIFORNIA           

P:  7MAY2021 133495    37.5N  118.6W 2.5-4.6 AABAA  California/Nevada area     

 

NEIC reported this earthquake of M 2.6 in Central California was felt with intensity II-III in the area(s) of Central California in Atwater.

 

O:  8MAY2021 07:04:42  37.3N  121.7W Md=2.3  EMSC   NORTHERN CALIFORNIA          

P:  7MAY2021 133500    37.4N  121.8W 2.5-4.6 AAAAA  Central California         

 

O:  9MAY2021 04:06:26  37.8N  122.7W Md=2.4  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  8MAY2021 133500    37.8N  122.6W 2.5-4.6 AAAAA  Central California         

 

O:  9MAY2021 02:18:29  38.8N  122.8W Md=2.2  EMSC   NORTHERN CALIFORNIA          

P:  9MAY2021 133501    38.7N  122.7W 2.5-4.6 AAAAA  Central California         

 

O:  8MAY2021 08:29:09  40.4N  124.4W ML=2.1  EMSC   NORTHERN CALIFORNIA          

P:  8MAY2021 133576    40.6N  124.9W 2.5-4.6 AAAAA  Off Coast of No. Calif     

 

NEIC reported this earthquake of M 2.5 in Northern California was felt with intensity II-III in the area(s) of Northern California in Eureka.

 

 

ALASKA

 

O:  8MAY2021 11:44:59  60.2N  153.2W ML=3.1  EMSC   SOUTHERN ALASKA              

P:  4MAY2021 133619    60.2N  153.2W 3.2-4.9 CAAAA  Central Alaska             

 

O:  8MAY2021 19:49:22  60.3N  151.1W ML=3.6  EMSC   KENAI PENINSULA, ALASKA      

P:  2MAY2021 133620    60.5N  151.5W 3.2-4.9 CAAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.4 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska at Clam Gulch.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  8MAY2021 08:37:00  44.2N  129.2W mb=3.8  EMSC   OFF COAST OF OREGON          

P:  9MAY2021 133578    44.5N  129.8W 3.0-4.5 AAAAA  Off Coast of Oregon        

 

O:  9MAY2021 02:03:44  61.4N  141.0W MB=4.6  ECAN  BEAVER CREEK, YT            

O:  9MAY2021 02:03:46  61.5N  140.6W mb=4.9  EMSC   SOUTHERN YUKON TERRITORY, CANA

P:  6MAY2021 133621    62.8N  143.8W 3.2-5.3 BBBAA  Central Alaska             

 

ROCKY MOUNTAINS REGION

 

O: 08MAY2021 16:26:01  31.7N  104.3W mb=2.9  EMSC   WESTERN TEXAS

O: 09MAY2021 06:10:35  31.7N  104.4W mb=3.0  EMSC   WESTERN TEXAS

O:  8MAY2021 21:03:02  31.6N  104.4W mb=3.1  EMSC   WESTERN TEXAS                

P:  5MAY2021 133528    32.0N  104.6W 2.0-3.9 BAAAA  SW U.S.A                   

P:  8MAY2021 133528    32.5N  103.6W 2.0-3.9 AAAAA  SW U.S.A                   

 

NEIC reported this earthquake of M 3.1 in New Mexico was felt with intensity II-III in the area(s) of New Mexico at Carlsbad and in western Texas at Salt Flat and Pecos.

 

O:  8MAY2021 09:21:59  44.5N  115.2W Ml=3.0  EMSC   SOUTHERN IDAHO               

P:  9MAY2021 133566    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O:  8MAY2021 21:14:20  35.9N   84.0W Md=2.2  EMSC   EASTERN TENNESSEE            

P:  2MAY2021 133512    35.0N   84.0W 2.0-4.0 CAAAA  Kentucky/Tennessee/NC      

P:  9MAY2021 133544    34.0N   85.0W 2.0-3.9 ABAAA  Southeast U.S.             

 

O: 08MAY2021 17:04:55  38.7N   97.0W mb=3.2  EMSC   KANSAS

O:  8MAY2021 11:04:43  38.7N   97.0W mb=3.2  EMSC   KANSAS                        

P:  4MAY2021 133547    39.0N   99.0W 2.0-4.3 BABAA  Southern Plains            

 

NEIC reported these earthquakes of M 3.2 and M 3.1 in Kansas was felt with intensity III-IV in the area(s) of Kansas at Herington and Hope.

 

HAWAII

 

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

 

 

 

 

 

 

 

 

 

STRONG FIJI QUAKE PROMOTED BY LARGEST FLARE IN HALF A YEAR

 

EARTHQUAKE SUMMARY FOR  MAY 7, 2021

 

The largest earthquake in the world today was an M 6.1 near the geomagnetic equator in Fiji. This event followed the strongest solar flare observed by SWPC since an M4.4 on November 29, 2020 and was measured by SWPC at M3.9.  The parameters for this flare given by SWPC are:

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

#-------------------------------------------------------------------------------

 640       1843   1904      1919   M3.9      (May 7, 2021)   4.5E-02  

 

The earthquake of M 6.1 in Fiji occurred within minutes of local solar noon a time when solar and tidal effects are maximized and was probably triggered by the M3.9 flare. Forecast 133647 expected today's event in Fiji was likely within about 100 km around May 8. An M 6.5 occurred within about 150 km of this epicenter on April 24, 2021 (also near local solar noon) with the previous such quake of M 6.1 on November 11, 2019. When the M 6.5 occurred in late April, this summary noted in this regard:

 

"The strongest earthquake in the world today was an M 6.5  in Central Tonga. NEIC reported it was felt with intensity VI in Tofoa-Koloua, Tonga  and II in Neiafu, Vavau, Tonga. The last earthquake with M>=6.5 in the world was an M 6.6 on April 3, 2021 in the South Atlantic. The only other event of this magnitude or greater in the world in the past month was an M 6.5 aftershock in the Kermadec Islands aon April 1, 2021. This earthquake occurred near local solar noon in an area near the regional geomagnetic equator. It was preceded about an hour earlier by an M 5.3 about 150 km to the south, an earthquake which occurred within about 30 minutes of local solar noon. It was probably promoted effects from the strong geomagnetic storm and solar flares of the past several days which maximize near this hour. The M 6.5 is the strongest earthquake within about 250 km of this epicenter since an M 6.6 on November 4, 2019." (April 24, 2021)

 

O:  7MAY2021 23:35:15  18.9S  177.6W Mw=6.1  EMSC   FIJI REGION                  

P:  8MAY2021 133647    18.0S  178.0W 4.0-5.7 AAAAA  Tonga Islands              

 

The series of moderate earthquakes of the past several days in California continued today. Moderate earthquakes in the northern Gulf of California and Baja California continued with a series of events of M 3.5-4.2 today. This summary reported in the previous issue on this series as:

 

 

"A pair of moderate earthquakes of M 4.1 and 4.2 also occurred in the Gulf of California today. Earthquakes of M>=4.2 have most recently occurred within about 100 km of these epicenters on April 1, 2021 (M 4.7) and February 13, 2020 (M 4.3). Forecast 133527 had expected this activity within about 25 km was likely to occur in early May." (May 6-7, 2021)

 

Moderate activity in this region can precede enhanced regional seismicity in Southern California within days as stresses migrate to the northwest.

 

O: 07MAY2021 08:53:20  30.1N  113.9W ML=4.0  EMSC   GULF OF CALIFORNIA

O: 07MAY2021 08:58:35  30.1N  113.8W ML=3.8  EMSC   GULF OF CALIFORNIA

O: 07MAY2021 09:00:14  30.1N  113.7W ML=3.9  EMSC   GULF OF CALIFORNIA

O: 07MAY2021 09:27:03  30.1N  113.9W ML=3.8  EMSC   GULF OF CALIFORNIA

O:  7MAY2021 08:49:02  30.0N  114.0W ML=4.1  EMSC   GULF OF CALIFORNIA           

P:  1MAY2021 133527    30.2N  114.1W 2.0-4.1 BAAAA  SW U.S.A                   

 

An earthquake of M 6.0 in the Macquarie Islands today followed an M 5.4 to the southeast of this on May 5. This summary noted that event at the time as:

 

An "M 5.4 in the area west of the Macquarie Island area and an M 5.1 in the

Southwest Indian Ridge. An M 6.1 hit the area west of Macquarie Island on March 20, 2021 about 400 km southeast of today's epicenter but the last of similar or larger magnitude within about 200 km of today's epicenter occurred as an M 5.7 on November 8, 2016 and prior to that as an M 5.5 on December 24, 2014. The antipode of this event is at 57N 33W in the Reykjanes Ridge in the north Atlantic Ridge  south of Iceland. Some seismic enhancement in this region is possible following today's event in the Macquarie Island area." (May 6, 2021)

 

O:  7MAY2021 15:21:14  54.5S  144.1E Mw=6.0  EMSC   WEST OF MACQUARIE ISLAND     

 

A moderate sized earthquake in the Northern Mid-Atlantic today of M 5.5 did occur along with today's M 6.0 in the Macquarie Islands. It was located east of The Leeward Islands in the eastern Caribbean. This is among the largest earthquakes in this area of the North Atlantic (within about 200 km) in the past 30 years. A set of three moderate to large  quakes last hit the area in November,  2018 which included the largest event in this area in the past 30 years and were the last events of M>=5.5 in the area. Forecast 133455 had expected activity in this area of the North Atlantic Ridge was likely around May 8.

 

O:  7MAY2021 11:45:25  14.1N   48.3W Mw=5.5  EMSC   NORTH ATLANTIC OCEAN         

P:  8MAY2021 133455    15.0N   46.0W 4.0-5.5 AABAA  Mid-Atlantic 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: 07MAY2021 21:24:16  22.7N  120.8E mb=4.5  EMSC   TAIWAN

O:  7MAY2021 21:24:14  22.7N  120.8E ML=4.6  TAI    Hualien, Taiwan              

O:  8MAY2021 01:04:32  22.7N  120.8E ML=4.3  TAI    Hualien, Taiwan              

P:  7MAY2021 133484    22.0N  121.0E 4.0-5.7 AAAAA  Taiwan                     

 

NEIC reported this earthquake of M 4.5 in Taiwan was felt with intensity II-III in the area(s) of Taiwan at Kaohsiung

CWB reported the M 4.6 was felt with intensity III in Pingtung; II in Taitung,  Kaohsiung, and I in Tainan, Hualien, Chiayi and Yunlin Counties, Taiwan.

 

O:  8MAY2021 04:35:02  23.9N  121.5E ML=4.0  EMSC   TAIWAN                       

O:  8MAY2021 04:35:02  23.9N  121.4E ML=4.0  TAI    Hualien, Taiwan              

P:  8MAY2021 133485    24.0N  123.0E 4.0-5.4 AAAAA  Taiwan                     

 

CWB reported the M 4.0 to the north was reported with intensity IV in Hualien, II in Tantou, Taichung and I in Yilan and Taitung.

 

O:  7MAY2021 07:56:43  38.7N   70.4E mb=4.3  EMSC   TAJIKISTAN                   

P:  7MAY2021 133509    37.0N   72.0E 3.8-5.4 ABAAA  Hindu Kush/Pakistan        

 

O:  7MAY2021 12:44:50  29.6N   50.6E mb=4.6  EMSC   SOUTHERN IRAN                

P:  2MAY2021 133483    29.0N   53.0E 3.5-5.0 BABAA  So. Iran/Persian Gulf      

 

O:  7MAY2021 19:48:43  34.8N   46.7E mb=4.4  EMSC   WESTERN IRAN                  

P:  5MAY2021 133542    33.0N   46.0E 3.8-5.5 ABAAA  So. Iran                   

 

O:  8MAY2021 02:53:52  43.3N   80.8E mb=4.0  EMSC   KAZAKHSTAN-XINJIANG BORDER REG

P:  5MAY2021 133563    42.0N   83.0E 4.0-5.4 BBBAA  Kirgizstan/Xinjiang         

 

O:  7MAY2021 20:18:37  38.2N   38.7E ML=4.0  EMSC   EASTERN TURKEY               

P:  6MAY2021 133549    38.0N   39.0E 3.5-5.2 AAAAA  Turkey                     

 

INDONESIA AND PHILIPPINES

 

O: 07MAY2021 07:42:16   1.6N  122.0E ML=4.0  EMSC   MINAHASA, SULAWESI, INDONESIA

O:  8MAY2021 03:34:31   0.2N  122.4E ML=4.2  EMSC   MINAHASA, SULAWESI, INDONESIA

P:  9MAY2021 133398     1.0N  122.0E 4.0-5.5 AAAAA  Celebes Sea                

 

O:  7MAY2021 15:30:59   4.1N  125.9E ML=4.0  EMSC   KEPULAUAN SANGIHE, INDONESIA 

O:  7MAY2021 07:43:50   4.4N  127.4E mb=4.8  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  6MAY2021 133410     4.0N  126.0E 4.0-5.4 AAAAA  Mindanao, Philippines      

 

O:  7MAY2021 07:10:43   6.1N  126.0E mb=4.6  EMSC   MINDANAO, PHILIPPINES         

P:  9MAY2021 133410     6.0N  125.0E 4.0-5.5 AAAAA  Mindanao, Philippines      

P: 10MAY2021 133401     7.0N  126.0E 4.0-5.7 BAAAA  Central Philippines        

 

O:  7MAY2021 19:07:05   8.3S  106.8E ML=4.2  EMSC   SOUTH OF JAVA, INDONESIA     

P:  7MAY2021 133645    10.0S  107.0E 4.0-5.6 ABAAA  So. of Java                

 

O:  7MAY2021 09:25:23   8.4S  120.7E mb=4.3  EMSC   FLORES REGION, INDONESIA     

P:  9MAY2021 133419     8.0S  121.0E 4.0-5.5 AAAAA  Flores Island area         

 

O:  7MAY2021 13:17:11  10.8S  122.0E mb=4.4  EMSC   SAVU SEA                     

P:  9MAY2021 133644    11.0S  119.0E 4.0-5.4 AACAA  So. of Indonesia           

 

 

CENTRAL AND SOUTH AMERICA

 

O:  8MAY2021 02:31:26  12.1N   60.0W mb=4.4  EMSC   TOBAGO REGION, TRINIDAD-TOBAGO

P:  4MAY2021 133467    11.0N   62.0W 3.4-5.2 BBBAA  Windward Islands           

 

O:  7MAY2021 21:46:30   4.9S   80.7W mb=4.2  EMSC   PERU-ECUADOR BORDER REGION   

P:  6MAY2021 133418     4.0S   80.0W 4.0-5.8 AAAAA  Ecuador                    

 

O:  7MAY2021 07:26:30   8.8N   84.3W ML=4.3  EMSC   OFF COAST OF COSTA RICA      

P:  7MAY2021 133404     9.0N   85.0W 3.5-5.2 AAAAA  Costa Rica                 

 

O:  8MAY2021 06:38:25  16.8N   94.6W mb=4.1  EMSC   OAXACA, MEXICO               

P:  5MAY2021 133444    16.0N   95.0W 3.5-5.1 BAAAA  Chiapas, Mexico            

 

O:  7MAY2021 08:44:55  18.0N  103.3W ML=3.4  EMSC   OFFSHORE MICHOACAN, MEXICO   

P:  5MAY2021 133454    18.0N  104.0W 3.5-5.6 AAAAA  Michoacan, Mexico          

 

O:  7MAY2021 13:47:20  18.6N  101.6W ML=4.1  EMSC   MICHOACAN, MEXICO            

P:  7MAY2021 133454    19.0N  101.0W 3.5-5.8 AAAAA  Michoacan, Mexico          

 

O:  7MAY2021 07:44:44  19.4N   67.1W Md=3.5  EMSC   PUERTO RICO REGION           

P:  5MAY2021 133463    18.0N   67.0W 3.4-5.0 ABAAA  Puerto Rico                

P:  5MAY2021 133469    20.0N   68.0W 3.0-4.7 AAAAA  Bahamas/No. Caribbean      

 

O:  8MAY2021 02:29:21  21.9S   67.4W mb=4.6  EMSC   POTOSI, BOLIVIA              

P:  7MAY2021 133652    23.0S   67.0W 4.0-5.6 ABAAA  Argentina                  

 

O:  7MAY2021 15:01:39  21.9S   68.7W mb=4.7  EMSC   ANTOFAGASTA, CHILE           

P: 10MAY2021 133670    20.0S   69.0W 4.0-5.4 BBAAA  So. Peru/Bolivia           

 

NEIC reported this earthquake of M 4.6 in Antofagasta, Chile was felt with intensity II-III in the area(s) of Iquique, Tarapaca, Chile.

 

O:  7MAY2021 16:19:49  24.2S   67.2W ML=4.1  EMSC   SALTA, ARGENTINA             

P:  7MAY2021 133652    23.0S   67.0W 4.0-5.6 ABAAA  Argentina                  

 

O:  8MAY2021 02:23:21  27.7N  111.7W ML=4.2  EMSC   GULF OF CALIFORNIA           

P: 10MAY2021 133472    28.0N  112.0W 3.5-5.1 AAAAA  Gulf of California         

 

 

AFRICA AND EUROPE

 

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

 

SOUTHWEST PACIFIC

 

O:  7MAY2021 10:29:38  12.0S  166.7E mb=4.4  EMSC   SANTA CRUZ ISLANDS           

P:  5MAY2021 133649    12.0S  167.0E 4.0-5.8 AAAAA  Vanuatu Islands            

 

O:  7MAY2021 23:35:15  18.9S  177.6W Mw=6.1  EMSC   FIJI REGION                   

P:  8MAY2021 133647    18.0S  178.0W 4.0-5.7 AAAAA  Tonga Islands              

 

OCEAN RIDGES

 

O:  7MAY2021 11:45:25  14.1N   48.3W Mw=5.5  EMSC   NORTH ATLANTIC OCEAN         

P:  8MAY2021 133455    15.0N   46.0W 4.0-5.5 AABAA  Mid-Atlantic Ridge         

 

O:  8MAY2021 04:13:57   4.5S  105.4W Mw=4.9  EMSC   CENTRAL EAST PACIFIC RISE    

P: 10MAY2021 133425     5.0S  105.0W 4.0-5.6 AAAAA  No. East Pacific Rise      

 

O:  7MAY2021 15:21:14  54.5S  144.1E Mw=6.0  EMSC   WEST OF MACQUARIE ISLAND     

 

O:  7MAY2021 10:48:37  56.5S   26.7W mb=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  9MAY2021 133712    57.0S   27.0W 4.0-6.0 AAAAA  So. Sandwich Islands       

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  7MAY2021 15:21:14  54.5S  144.1E Mw=6.0  EMSC   WEST OF MACQUARIE ISLAND     

 

O:  7MAY2021 11:13:13  42.5S  173.0E ML=3.8  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O:  7MAY2021 17:14:51  43.5S  172.8E ML=3.7  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 07MAY2021 11:13:13  42.5S  173.0E ML=4.0  GEONET Felt with moderate intensity

P:  8MAY2021 133707    42.0S  172.0E 3.0-4.9 AAAAA  So. Island, N.Z.           

 

GEONET reported this earthquake was felt with moderate intensity in northern South Island. 50 people reported feeling this event; 24 with weak intensity; 17 with light shaking; 8 moderate; 0 strong; 0 with severe and 1 with extreme shaking.

 

 

JAPAN AND KURIL ISLANDS

 

O:  8MAY2021 04:19:08  32.0N  140.5E Mw=5.2  EMSC   IZU ISLANDS, JAPAN REGION    

P:  7MAY2021 133524    32.0N  142.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

 

O:  8MAY2021 05:38:28  39.9N  143.9E mb=4.2  EMSC   OFF EAST COAST OF HONSHU, JAPA

P:  9MAY2021 133525    39.0N  141.0E 4.0-5.4 AABAA  Off East Coast Honshu      

 

O:  8MAY2021 03:20:06  47.0N  152.8E mb=4.2  EMSC   KURIL ISLANDS                

P:  4MAY2021 133585    48.0N  154.0E 3.5-5.8 BAAAA  So. Kurils                 

 

O: 08MAY2021 00:38:16  50.7N  154.6E mb=4.5  EMSC   KURIL ISLANDS

O:  7MAY2021 08:08:19  49.6N  155.7E mb=4.9  EMSC   KURIL ISLANDS                

P:  7MAY2021 133570    49.0N  155.0E 3.5-5.8 AAAAA  NE Pacific                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 07MAY2021 08:53:20  30.1N  113.9W ML=4.0  EMSC   GULF OF CALIFORNIA

O: 07MAY2021 08:58:35  30.1N  113.8W ML=3.8  EMSC   GULF OF CALIFORNIA

O: 07MAY2021 09:00:14  30.1N  113.7W ML=3.9  EMSC   GULF OF CALIFORNIA

O: 07MAY2021 09:27:03  30.1N  113.9W ML=3.8  EMSC   GULF OF CALIFORNIA

O:  7MAY2021 08:49:02  30.0N  114.0W ML=4.1  EMSC   GULF OF CALIFORNIA           

P:  1MAY2021 133527    30.2N  114.1W 2.0-4.1 BAAAA  SW U.S.A                   

 

O:  7MAY2021 22:40:19  33.7N  116.8W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P:  3MAY2021 133533    33.9N  116.9W 2.5-4.8 BAAAA  So. California             

 

O:  8MAY2021 03:27:51  36.0N  116.1W ml=2.3  EMSC   CENTRAL CALIFORNIA           

P:  9MAY2021 133516    37.3N  114.9W 2.5-4.4 ABAAA  Nevada area                

 

O:  7MAY2021 07:27:01  36.1N  120.7W Md=2.6  EMSC   CENTRAL CALIFORNIA           

P:  3MAY2021 133498    36.2N  120.8W 2.5-4.4 BAAAA  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 Cambria.

 

O:  7MAY2021 18:13:51  36.5N  117.5W ML=2.1  EMSC   CENTRAL CALIFORNIA           

P:  9MAY2021 133491    36.2N  117.9W 2.5-5.1 AAAAA  California/Nevada area     

 

O:  7MAY2021 23:59:43  39.1N  120.0W ml=2.2  EMSC   NORTHERN CALIFORNIA          

P:  6MAY2021 133496    39.3N  120.0W 2.5-4.5 AAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 2.6  in Tahoe City, California was felt with intensity II-III in the area(s) of Tahoe City, California at Rahoe City, Pollock Pines, Camino, Yuba City, Sacramento and in Nevada at Glenbrook and Gardnerville. 

 

O:  7MAY2021 16:31:59  40.3N  124.0W Md=2.2  EMSC   NORTHERN CALIFORNIA          

P:  8MAY2021 133576    40.6N  124.9W 2.5-4.6 AAAAA  Off Coast of No. Calif     

 

 

ALASKA

 

O:  7MAY2021 15:58:13  56.5N  148.5W ML=3.4  EMSC   GULF OF ALASKA               

P:  5MAY2021 133626    54.9N  149.8W 3.0-4.6 ABAAA  Northern Alaska            

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  7MAY2021 14:20:49  42.0N  125.9W ML=2.8  EMSC   OFF COAST OF OREGON          

P:  9MAY2021 133577    40.9N  126.3W 2.5-4.8 ABAAA  Off Coast of No. Calif     

 

ROCKY MOUNTAINS REGION

 

O:  7MAY2021 12:04:09  40.2N  111.2W Ml=2.0  EMSC   UTAH                         

P:  6MAY2021 133550    39.7N  110.8W 2.0-4.1 AAAAA  Utah area                  

 

O:  7MAY2021 14:13:56  28.4N  100.1W mb=2.6  EMSC   SOUTHERN TEXAS               

P: 30APR2021 133183    29.0N   98.0W 3.0-4.6 CABAA  Northern Mexico            

 

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

 

O: 07MAY2021 07:18:21  44.3N  115.2W Ml=2.0  EMSC   SOUTHERN IDAHO

O: 08MAY2021 00:39:14  44.3N  115.2W Ml=2.2  EMSC   SOUTHERN IDAHO

O: 08MAY2021 00:43:36  44.3N  115.1W Ml=2.0  EMSC   SOUTHERN IDAHO

O:  7MAY2021 06:52:25  44.3N  115.2W Ml=2.0  EMSC   SOUTHERN IDAHO               

P:  9MAY2021 133566    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

O:  7MAY2021 12:54:27  45.4N  112.1W Ml=2.1  EMSC   WESTERN MONTANA              

P:  3MAY2021 133567    45.7N  112.1W 2.0-4.4 BAAAA  Montana/Idaho              

P:  7MAY2021 133592    45.6N  111.9W 2.0-4.4 AAAAA  Yellowstone/Wyoming        

 

EASTERN U.S./CANADA

 

O:  8MAY2021 02:45:59  39.7N   98.4W mb=2.7  EMSC   KANSAS                       

P:  4MAY2021 133547    39.0N   99.0W 2.0-4.3 BAAAA  Southern Plains            

 

HAWAII

 

O: 07MAY2021 14:22:14  19.3N  155.5W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O:  8MAY2021 06:33:14  19.2N  155.5W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7MAY2021 133448    19.9N  156.1W 3.0-4.9 AAAAA  Hawaii                     

 

NEIC reported this earthquake of M 3.0 in  Hawaii was felt with intensity II-III in the area(s) of  Hawaii at Naalehu, Captain Cook, Volcanom, Kailua Kona, Honomu and Kamuela.

 

MODERATE QUAKE SHAKES TAHOE, CALIFORNIA AREA

 

EARTHQUAKE SUMMARY FOR  MAY 6, 2021

 

A moderate earthquake of M 4.7 was widely felt in the area of Tahoe on the northern border of California and Nevada today. This was the strongest earthquake in the U.S. or Canada today. It was accompanied by several felt foreshocks and aftershocks. NEIC reported it was felt with maximum intensity IV in California at Sierraville, Truckee, Soda Springs, Norden, Loyalton, Kings Beach and with lesser intensity in Tahoe National Park, Calpine, and Carnelian Bay among other localities. An M 2.5 regional foreshock occurred and was felt with intensity II in Incline Village, Nevada. This is the strongest earthquake in the Tahoe region within about 150 km of this epicenter since an M 4.8 on August 4, 2016 about 75 km northeast of today's epicenter. An M 5.0 hit about 150 km west of this on January 30, 2016. A moderately larger M 5.7 occurred about 100 km northwest of today's epicenter on May 24, 2013 - that was the  strongest in the area in the past 30 years at least.

 

When an M 3.7 hit the area about 50 km south of this epicenter near Reno, Nevada and Tahoe, California on April 25, 2021 this summary noted:

 

"A moderate earthquake of M 3.7 was widely felt in the area of Reno, Nevada near the California-Nevada border. NEIC reported it was felt with intensity IV in Tahoe City, Olympic Valley, Homewood, Kings Beach and III in Tahoe Vista, Tahoma, Carnelian Bay and in Nevada with II-III in Carson City, Glenbrook. 

This is the strongest earthquake in this region within about 100 km since an M 4.5 in Nevada about 50 km to the east of today's epicenter. An M 3.7-3.8 also  occurred about 100 km east of this on December 12, 2020. Forecast 133197 had expected today's quake within about 25 km was likely around April 24. This epicenter is at the fourth node (90 degrees) from the M 7.7 in the Loyalty Islands of February 10 and at the fifth node (72 degrees) from the recent major earthquakes off eastern Honshu, Japan of March 20 and may have been promoted by energy from those sources." (April 25-26, 2021)

 

Forecasts 133496 and 133503 had expected today's activity was likely within about 25 km of these epicenters to occur around May 6-9 with magnitude up to M 4.6.

 

O: 07MAY2021 04:35:13  39.5N  120.3W Mw=4.7  EMSC   NORTHERN CALIFORNIA

O: 07MAY2021 04:37:37  39.5N  120.3W ML=3.1  EMSC   NORTHERN CALIFORNIA

O: 07MAY2021 05:03:57  39.5N  120.3W Md=2.2  EMSC   NORTHERN CALIFORNIA

O:  7MAY2021 04:26:30  39.5N  120.3W ML=3.3  EMSC   NORTHERN CALIFORNIA           

P:  6MAY2021 133496    39.3N  120.0W 2.5-4.5 AAAAA  California/Nevada area     

P:  9MAY2021 133503    39.8N  120.6W 2.5-4.6 AAAAA  Central California         

 

O:  6MAY2021 13:18:34  39.1N  120.0W MD=2.5  EMSC   NORTHERN CALIFORNIA          

P:  6MAY2021 133496    39.3N  120.0W 2.5-4.5 AAAAA  California/Nevada area     

 

A pair of moderate earthquakes of M 4.1 and 4.2 also occurred in the Gulf of California today. Earthquakes of M>=4.2 have most recently occurred within about 100 km of these epicenters on April 1, 2021 (M 4.7) and February 13, 2020 (M 4.3). Forecast 133527 had expected this activity within about 25 km was likely to occur in early May.

 

O: 07MAY2021 02:03:48  30.1N  113.8W ML=4.1  EMSC   GULF OF CALIFORNIA

O:  6MAY2021 17:05:52  30.1N  113.9W ML=4.2  EMSC   GULF OF CALIFORNIA           

P:  1MAY2021 133527    30.2N  114.1W 2.0-4.1 BAAAA  SW U.S.A                   

 

A series of light earthquakes also occurred today in the region of northern

Kansas. This included an M 3.8 and afterhocks of M 3.0, 3.1 and 3.1.  An M 3.8 in northern Kansas today was widely felt.  NEIC reported this earthquake and aftershocks of M 3.1 in Kansas was felt with intensity IV in the area(s) of Kansas at Formoso, Courtland, Burr Oak, Hope and II-III in Jewel, Randall, Webber, Mankato, Belleville, Concordia, and Bend, Herington and Ramona. Other aftershocks of M 3.1 and 3.0 in Kansas were felt with intensity IV in Formoso and possibly in Sylvan Grove and in Peru, Nebraska.  This is the strongest earthquake within about 100 km of this epicenter in the past year. An M 4.5 occurred about 150 km southeast of this in Kansas on January 19, 2020. Forecast 133547 had expected today's activity in northern Kansas was likely around May 4. This activity is at 101-103 degrees from the major quakes in February and March, 2020 in the Kermadec and Loyalty Islands and was probably promoted by energy from those sources. Other events at this distance from these quakes occurred as an M 4.7 in Siberia, southern Alaska and Panama.

 

 

O: 06MAY2021 13:04:24  39.7N   98.0W mb=3.0  EMSC   KANSAS

O: 06MAY2021 11:35:32  39.8N   98.0W mb=3.8  EMSC   KANSAS

O:  7MAY2021 06:30:18  38.7N   97.0W mb=3.1  EMSC   KANSAS                       

O:  6MAY2021 18:20:33  39.8N   98.0W mb=3.1  EMSC   KANSAS                       

P:  4MAY2021 133547    39.0N   99.0W 2.0-4.3 AAAAA  Southern Plains            

 

An M 3.8 occurred in the region of southwestern Puerto Rico near Ponce today. NEIC reported this earthquake of M 3.8 in Southwest Puerto Rico was felt with intensity II-III in the area(s) of Southwest Puerto Rico with IV in Lajas, Sabana Grande and lesser shaking at Guanica, San German, Cabo Rojo, Yauco, Ponce and Guaynaco.  The last earthquake in this aftershock zone of larger magnitude occurred on December 24, 2020 with a series including an M 4.7 and M 4.8. Forecast 133463 had expected today's event was likely within about 10 km of the M 3.8 to occur around May 5.

 

O: 06MAY2021 13:02:30  17.9N   67.0W ML=3.4  EMSC   PUERTO RICO REGION

O: 06MAY2021 13:06:07  18.0N   67.0W Md=3.2  EMSC   PUERTO RICO REGION

O: 06MAY2021 13:08:56  18.0N   67.0W ML=3.8  EMSC   PUERTO RICO REGION

O: 06MAY2021 13:13:31  18.0N   67.0W Md=3.2  EMSC   PUERTO RICO REGION

O: 06MAY2021 13:25:34  18.0N   67.0W Md=3.1  EMSC   PUERTO RICO REGION

O:  6MAY2021 21:43:10  18.0N   67.0W Md=3.1  EMSC   PUERTO RICO REGION           

P:  5MAY2021 133463    18.0N   67.0W 3.4-5.0 AAAAA  Puerto Rico                

 

The strongest earthquake in the world today was an M 5.3 in Central Vanuatu.

It was not reported felt in this area. A similar M 5.3-5.4 quake hit about 100 km northeast of this on May 1, 2021 but the last of larger magnitude in the region was  an M 5.8 about 150 km south of this on February 28, 2020. Forecast 133649 had expected today's event was likely within about 75 km around May 3.

 

O:  6MAY2021 12:20:37  16.6S  167.5E mb=5.3  EMSC   VANUATU                      

P:  3MAY2021 133649    17.0S  167.0E 4.0-5.6 BAAAA  Vanuatu Islands            

 

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:  6MAY2021 07:07:18  42.6N   79.5E mb=4.5  EMSC   EASTERN KAZAKHSTAN            

P:  1MAY2021 133563    41.0N   77.0E 4.0-5.5 BBBAA  Kirgizstan/Xinjiang        

 

O:  6MAY2021 19:53:15  53.7N  161.4E mb=4.5  EMSC   OFF EAST COAST OF KAMCHATKA  

P:  4MAY2021 133599    54.0N  161.0E 4.0-5.5 AAAAA  E. of Kamchatka            

 

O:  6MAY2021 20:08:55  56.1N  113.7E mb=4.1  EMSC   BURYATIYA, RUSSIA            

 

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

 

INDONESIA AND PHILIPPINES

 

O:  6MAY2021 17:42:37   1.5S  134.4E ML=4.7  EMSC   NEAR N COAST OF PAPUA, INDONES

P:  6MAY2021 133435     1.0S  133.0E 4.0-5.5 AABAA  West Irian, PNG            

P:  6MAY2021 133435     3.0S  134.0E 4.0-5.6 ABAAA  West Irian, PNG            

 

O:  6MAY2021 11:26:10   1.6N  128.5E ML=4.4  EMSC   HALMAHERA, INDONESIA          

P:  3MAY2021 133406     1.0N  128.0E 4.0-5.5 BAAAA  Halmahera                  

 

O:  6MAY2021 17:06:25   2.2S  139.5E ML=4.4  EMSC   NEAR N COAST OF PAPUA, INDONES

P:  4MAY2021 133436     2.0S  139.0E 4.0-5.5 AAAAA  West Irian, PNG            

 

O:  7MAY2021 02:16:54   2.9S  129.7E mb=4.4  EMSC   SERAM, INDONESIA             

O:  7MAY2021 02:00:11   4.2S  128.9E ML=4.4  EMSC   BANDA SEA                    

P:  1MAY2021 133417     4.0S  128.0E 4.0-5.4 CAAAA  Ceram area                 

 

O:  6MAY2021 13:17:09   5.3N  126.3E mb=4.5  EMSC   MINDANAO, PHILIPPINES        

P:  2MAY2021 133410     5.0N  126.0E 4.0-5.6 BAAAA  Mindanao, Philippines      

 

O:  6MAY2021 22:21:26   5.5S  151.8E mb=4.9  EMSC   NEW BRITAIN REGION, P.N.G.   

P:  4MAY2021 133422     5.0S  152.0E 4.0-5.4 AAAAA  New Britain                

 

O:  6MAY2021 20:07:36   6.2N  124.1E ML=4.4  EMSC   MINDANAO, PHILIPPINES        

P:  9MAY2021 133410     6.0N  125.0E 4.0-5.5 BAAAA  Mindanao, Philippines      

 

O:  6MAY2021 12:11:07   7.5S  127.9E mb=4.9  EMSC   KEPULAUAN BARAT DAYA, INDONESI

P:  5MAY2021 133438     7.0S  130.0E 4.0-5.4 AABAA  West Irian, PNG            

 

CENTRAL AND SOUTH AMERICA

 

O: 06MAY2021 13:02:30  17.9N   67.0W ML=3.4  EMSC   PUERTO RICO REGION

O: 06MAY2021 13:06:07  18.0N   67.0W Md=3.2  EMSC   PUERTO RICO REGION

O: 06MAY2021 13:08:56  18.0N   67.0W ML=3.8  EMSC   PUERTO RICO REGION

O: 06MAY2021 13:13:31  18.0N   67.0W Md=3.2  EMSC   PUERTO RICO REGION

O: 06MAY2021 13:25:34  18.0N   67.0W Md=3.1  EMSC   PUERTO RICO REGION

O:  6MAY2021 21:43:10  18.0N   67.0W Md=3.1  EMSC   PUERTO RICO REGION           

P:  5MAY2021 133463    18.0N   67.0W 3.4-5.0 AAAAA  Puerto Rico                

 

O:  6MAY2021 23:44:23   3.0N   84.3W mb=4.3  EMSC   OFF COAST OF CENTRAL AMERICA 

P:  9MAY2021 133403     4.0N   83.0W 4.0-5.6 BABAA  Ecuador                    

 

O:  6MAY2021 13:38:30  10.0N   84.1W ML=3.1  EMSC   COSTA RICA                   

P:  7MAY2021 133404     9.0N   85.0W 3.5-5.2 AAAAA  Costa Rica                 

 

O:  6MAY2021 18:32:33  15.8N   96.1W ML=4.1  EMSC   OAXACA, MEXICO               

P:  6MAY2021 133460    15.0N   97.0W 3.5-5.1 AAAAA  Oaxaca, Mexico             

 

O: 06MAY2021 13:31:26  17.4N  100.0W mb=4.6  EMSC   GUERRERO, MEXICO

O:  6MAY2021 14:05:30  16.9N  100.2W ML=4.0  EMSC   OFFSHORE GUERRERO, MEXICO    

P:  8MAY2021 133462    17.0N  100.0W 3.5-5.3 AAAAA  Oaxaca, Mexico             

 

NEIC reported this earthquake of M 4.6 in Guerrero, Mexico was felt with intensity II-III in the area(s) of Guerrero, Mexico in Acapulco and Tierra Colorado (IV) and in Chipancingo, and in Mexico City and Tlalnepantla.

 

O:  6MAY2021 21:43:10  18.0N   67.0W Md=3.1  EMSC   PUERTO RICO REGION           

P:  5MAY2021 133463    18.0N   67.0W 3.4-5.0 AAAAA  Puerto Rico                 

 

O:  6MAY2021 21:28:53  19.7N   71.0W ML=3.1  EMSC   DOMINICAN REPUBLIC           

P:  7MAY2021 133469    20.0N   71.0W 3.0-4.9 AAAAA  Bahamas/No. Caribbean      

 

O:  6MAY2021 08:57:01  19.7N  108.5W ML=4.0  EMSC   REVILLA GIGEDO ISLANDS REGION

P: 10MAY2021 133446    19.0N  109.0W 3.5-5.1 BAAAA  Coast of Jalisco, Mexico   

 

O:  6MAY2021 09:35:28  20.2N   70.8W ML=3.1  EMSC   DOMINICAN REPUBLIC REGION    

P:  7MAY2021 133469    20.0N   71.0W 3.0-4.9 AAAAA  Bahamas/No. Caribbean      

 

O:  6MAY2021 12:18:02  21.3S   68.5W mb=4.6  EMSC   ANTOFAGASTA, CHILE           

P:  4MAY2021 133651    21.0S   67.0W 4.0-5.8 AABAA  Argentina                  

 

O:  6MAY2021 23:50:28  24.0S   67.1W mb=4.2  EMSC   SALTA, ARGENTINA             

P:  7MAY2021 133652    23.0S   67.0W 4.0-5.6 AAAAA  Argentina                  

 

 

AFRICA AND EUROPE

 

O:  7MAY2021 03:08:07  37.6N   19.7E mb=4.4  EMSC   IONIAN SEA                   

P:  3MAY2021 133519    37.0N   21.0E 3.0-4.8 BAAAA  No. Greece                 

P:  8MAY2021 133519    38.0N   22.0E 3.0-4.4 AABAA  No. Greece                 

 

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

 

SOUTHWEST PACIFIC

 

O:  6MAY2021 18:01:33  11.5S  113.4E ML=4.1  EMSC   SOUTH OF JAVA, INDONESIA     

P:  6MAY2021 133644    11.0S  115.0E 4.0-5.4 AABAA  So. of Indonesia           

 

O:  7MAY2021 02:40:46  15.7S  167.4E mb=4.9  EMSC   VANUATU                      

P:  6MAY2021 133649    15.0S  167.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

O:  6MAY2021 12:20:37  16.6S  167.5E mb=5.3  EMSC   VANUATU                      

P:  3MAY2021 133649    17.0S  167.0E 4.0-5.6 BAAAA  Vanuatu Islands            

 

O:  6MAY2021 23:26:59  18.8S  177.3W mb=4.5  EMSC   FIJI REGION                  

P:  5MAY2021 133647    19.0S  177.0W 4.0-5.6 AAAAA  Tonga Islands              

 

O:  7MAY2021 06:46:26  21.0S  173.9W mb=5.0  EMSC   TONGA                        

P:  4MAY2021 133672    20.0S  174.0W 4.0-5.5 BAAAA  Tonga Islands              

 

O:  7MAY2021 04:25:30  25.7S  176.1W mb=5.2  EMSC   SOUTH OF FIJI ISLANDS        

P:  7MAY2021 133675    25.0S  177.0W 4.0-5.6 AAAAA  Tonga Islands              

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  6MAY2021 12:40:00  29.6S  176.1W mb=5.0  EMSC   KERMADEC ISLANDS REGION      

P:  7MAY2021 133663    29.0S  178.0W 4.0-5.4 AABAA  No. Kermadec Islands       

 

O:  6MAY2021 10:33:29  31.0S  180.0E ML=4.3  EMSC   KERMADEC ISLANDS REGION      

O: 06MAY2021 21:46:40  31.5S  179.2E ML=4.3  EMSC   KERMADEC ISLANDS REGION

P:  5MAY2021 133700    32.0S  178.0W 4.0-5.5 AABAA  So. Kermadec Islands       

 

O:  7MAY2021 04:11:35  34.6S  179.1E ML=3.6  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  8MAY2021 133694    37.0S  178.0E 3.0-4.4 ACAAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

O:  6MAY2021 15:15:14  42.3N  142.4E mb=4.3  EMSC   HOKKAIDO, JAPAN REGION       

P:  2MAY2021 133559    41.0N  141.0E 3.5-5.4 BBAAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O:  6MAY2021 13:18:34  39.1N  120.0W MD=2.5  EMSC   NORTHERN CALIFORNIA          

P:  6MAY2021 133496    39.3N  120.0W 2.5-4.5 AAAAA  California/Nevada area     

 

O: 07MAY2021 02:03:48  30.1N  113.8W ML=4.1  EMSC   GULF OF CALIFORNIA

O:  6MAY2021 17:05:52  30.1N  113.9W ML=4.2  EMSC   GULF OF CALIFORNIA           

P:  1MAY2021 133527    30.2N  114.1W 2.0-4.1 BAAAA  SW U.S.A                   

 

O:  6MAY2021 21:39:05  33.0N  118.6W ML=2.7  EMSC   CHANNEL ISLANDS REG., CALIFORN

P:  4MAY2021 133534    34.3N  118.5W 2.5-5.2 ABAAA  So. California             

 

NEIC reported this earthquake of M 2.7 in the Channel Islands, California  was felt with intensity II-III in the area(s) of  the Channel Islands, California at Torrance.

 

O:  7MAY2021 05:59:06  33.7N  116.8W Ml=2.8  EMSC   SOUTHERN CALIFORNIA          

P:  3MAY2021 133533    33.9N  116.9W 2.5-4.8 BAAAA  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 Idyllwild, Banning and Cathedral City.

 

O:  6MAY2021 17:32:59  35.6N  117.5W Ml=2.7  EMSC   SOUTHERN CALIFORNIA          

P:  6MAY2021 133540    35.8N  117.6W 2.5-5.0 AAAAA  So. California              

 

O:  6MAY2021 14:20:17  36.1N  120.7W Md=2.2  EMSC   CENTRAL CALIFORNIA           

P:  3MAY2021 133498    36.2N  120.8W 2.5-4.4 BAAAA  Central California         

 

O:  7MAY2021 02:35:35  36.4N  121.0W Md=2.1  EMSC   CENTRAL CALIFORNIA            

P:  3MAY2021 133498    36.2N  120.8W 2.5-4.4 BAAAA  Central California         

 

O:  6MAY2021 20:13:37  36.7N  121.3W Md=2.4  EMSC   CENTRAL CALIFORNIA           

P:  2MAY2021 133499    36.7N  121.4W 2.5-4.5 BAAAA  Central California         

 

O:  6MAY2021 13:42:21  37.4N  121.7W Md=2.4  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P:  7MAY2021 133500    37.4N  121.8W 2.5-4.6 AAAAA  Central California         

 

O: 06MAY2021 20:04:47  35.9N  117.7W Ml=2.5  EMSC   CENTRAL CALIFORNIA

O:  6MAY2021 20:55:50  37.7N  118.0W ml=2.4  EMSC   NEVADA                       

P:  7MAY2021 133495    37.5N  118.6W 2.5-4.6 AAAAA  California/Nevada area     

 

O:  6MAY2021 13:21:14  38.8N  122.8W Md=2.4  EMSC   NORTHERN CALIFORNIA          

O: 06MAY2021 21:52:24  38.8N  122.8W Md=2.5  EMSC   NORTHERN CALIFORNIA

P:  4MAY2021 133501    38.9N  122.8W 2.5-4.6 AAAAA  Central California         

 

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

 

O:  6MAY2021 13:18:34  39.1N  120.0W MD=2.5  EMSC   NORTHERN CALIFORNIA          

P:  6MAY2021 133496    39.3N  120.0W 2.5-4.5 AAAAA  California/Nevada area     

 

O:  7MAY2021 00:51:48  39.5N  122.3W Md=2.6  EMSC   NORTHERN CALIFORNIA          

P:  7MAY2021 133502    39.3N  123.2W 2.5-4.6 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.6 in Northern California was felt with intensity II-III in the area(s) of Northern California at Live Oak.

 

O: 07MAY2021 04:35:13  39.5N  120.3W Mw=4.7  EMSC   NORTHERN CALIFORNIA

O: 07MAY2021 04:37:37  39.5N  120.3W ML=3.1  EMSC   NORTHERN CALIFORNIA

O: 07MAY2021 05:03:57  39.5N  120.3W Md=2.2  EMSC   NORTHERN CALIFORNIA

O:  7MAY2021 04:26:30  39.5N  120.3W ML=3.3  EMSC   NORTHERN CALIFORNIA          

P:  6MAY2021 133496    39.3N  120.0W 2.5-4.5 AAAAA  California/Nevada area     

P:  9MAY2021 133503    39.8N  120.6W 2.5-4.6 AAAAA  Central California         

 

ALASKA

 

 

O:  7MAY2021 03:49:57  54.7N  160.6W ML=3.1  EMSC   ALASKA PENINSULA             

P:  5MAY2021 133614    54.5N  161.8W 3.5-5.3 AAAAA  Unimak Islands, Aleutians  

 

O:  6MAY2021 21:35:13  58.4N  151.1W ML=3.0  EMSC   KODIAK ISLAND REGION, ALASKA 

P:  2MAY2021 133620    60.5N  151.5W 3.2-4.9 BBAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.0 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska at Talkeetna and Wasilla.

 

O: 06MAY2021 09:31:13  62.1N  148.5W ML=3.0  EMSC   CENTRAL ALASKA

O:  7MAY2021 01:00:06  62.0N  149.8W ML=3.0  EMSC   CENTRAL ALASKA               

P:  6MAY2021 133622    62.8N  149.1W 3.2-4.9 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

 

No earthquakes of M>=2 were located in the Rocky Mountain region today.

 

EASTERN U.S./CANADA

 

O:  5MAY2021 07:47:25  47.8N   70.0W MB=1.5  ECAN  Charlevoix Seismic Zone       

P:  4MAY2021 133564    47.0N   69.0W 2.0-3.9 AAAAA  Maine                      

 

O: 06MAY2021 13:04:24  39.7N   98.0W mb=3.0  EMSC   KANSAS

O: 06MAY2021 11:35:32  39.8N   98.0W mb=3.8  EMSC   KANSAS

O:  7MAY2021 06:30:18  38.7N   97.0W mb=3.1  EMSC   KANSAS                       

O:  6MAY2021 18:20:33  39.8N   98.0W mb=3.1  EMSC   KANSAS                       

P:  4MAY2021 133547    39.0N   99.0W 2.0-4.3 AAAAA  Southern Plains            

 

O: 06MAY2021 13:54:32  36.0N   98.0W ML=2.1  EMSC   OKLAHOMA

O:  7MAY2021 04:23:55  36.0N   98.0W ML=2.2  EMSC   OKLAHOMA                     

O:  6MAY2021 13:30:05  36.4N   98.2W ML=2.2  EMSC   OKLAHOMA                     

P:  9MAY2021 133546    36.0N   97.0W 2.0-4.5 BAAAA  Southern Plains            

 

HAWAII

 

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

 

MODERATE SEISMICITY IN OCEAN RIDGES

 

EARTHQUAKE SUMMARY FOR  MAY 5, 2021

 

Moderate activity  occurred today in the ocean ridges. This included an M 5.4 in the area west of the Macquarie Island area and an M 5.1 in the Southwest Indian Ridge. An M 6.1 hit the area west of Macquarie Island on March 20, 2021 about 400 km southeast of today's epicenter but the last of similar or larger magnitude within about 200 km of today's epicenter occurred as an M 5.7 on November 8, 2016 and prior to that as an M 5.5 on December 24, 2014. The antipode of this event is at 57N 33W in the Reykjanes Ridge in the north Atlantic Ridge south of Iceland. Some seismic enhancement in this region is possible following today's event in the Macquarie Island area.

 

O:  5MAY2021 19:20:09  57.0S  147.5E Mw=5.4  EMSC   WEST OF MACQUARIE ISLAND     

 

The last event of M>=5.1 within about 200 km of today's epicenter in the Southwest Indian Ridge occurred on March 6, 2020. Forecast 133697 expected this event within this area was likely around May 3. The antipode of this epicenter is located at 31N 121W off the coast of southern California, an area which may see increased seismicity in coming days. This event occurred at 103 degrees from the M 6.8 in Honshu, Japan of May 2 and was probably promoted by energy from that source. Other events at this distance from Honshu, Japan today occurred in Chiapas, Mexico, the Macquarie Island area and in the Azores.

 

O:  5MAY2021 21:22:59  30.9S   59.3E mb=5.1  EMSC   SOUTHWEST INDIAN RIDGE       

P:  3MAY2021 133697    32.0S   59.0E 4.0-5.7 ABAAA  So. Indian Ocean           

 

The strongest earthquakes in the U.S. or Canada today occurred in the Aleutians of Alaska. These were and M 4.8 in the Alaska Peninsula near Unimak Island and  an M 4.5 in the Near Islands in the western portion of the Aleutians. Neither of these event were reported felt in these areas. The only earthquake of M>=4.5 in this area of the Near Islands in the past year was an M 4.6 on November 30, 2020. Earthquakes about 200 km to the west of today's Near Islands epicenter occurred in the past year with M 5.3 on April 15, 2021 and on December 9, 2020. Forecast 133609 had expected today's event was likely around May 2. 

 

 

O:  5MAY2021 17:15:49  52.2N  173.6E mb=4.5  EMSC   NEAR ISLANDS, ALEUTIAN ISLANDS

P:  2MAY2021 133609    51.0N  176.0E 4.0-5.9 BBBAA  Rat Islands                

 

The last earthquake in the Alaska Peninsula within about 200 km of today's epicenter with M>=4.8 occurred as an M 4.9 on February 6, 2021. The last in the Unimak Island area with greater or equal magnitude than M 4.8 occurred as an M 5.1 on January 11, 2021. Other earthquakes in the Unimak Island area of larger magnitude in the past year occurred as an M 5.6 on August 13, 2020 and an M 5.0 on November 4, 2020. Forecast 133614 had expected today's event was likely within about 15 km to occur around May 5.

 

O:  6MAY2021 00:19:42  54.5N  161.6W mb=4.8  EMSC   ALASKA PENINSULA             

P:  5MAY2021 133614    54.5N  161.8W 3.5-5.3 AAAAA  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:  5MAY2021 07:19:51  25.1N   94.9E ML=3.9  EMSC   MYANMAR-INDIA BORDER REGION  

P:  6MAY2021 133477    25.0N   95.0E 4.0-5.4 AAAAA  Myanmar                    

 

O:  5MAY2021 07:54:18  40.8N   78.3E mb=4.3  EMSC   SOUTHERN XINJIANG, CHINA     

P: 28APR2021 133266    40.0N   78.0E 4.0-5.4 CAAAA  Kirgizstan/Xinjiang        

 

O:  5MAY2021 06:57:55  49.9N   86.7E mb=4.7  EMSC   RUSSIA-KAZAKHSTAN BORDER REGIO

P:  1MAY2021 133611    50.0N   88.0E 3.0-4.6 BAAAA  So. Siberia                

 

O:  5MAY2021 14:08:43  52.0N  159.3E mb=4.5  EMSC   OFF EAST COAST OF KAMCHATKA  

P:  5MAY2021 133599    53.0N  160.0E 4.0-5.4 AAAAA  E. of Kamchatka            

 

INDONESIA AND PHILIPPINES

 

O:  5MAY2021 18:13:32   0.1S  123.1E mb=4.9  EMSC   SULAWESI, INDONESIA          

P:  5MAY2021 133433     1.0S  122.0E 4.0-5.5 AAAAA  Sulawesi area              

 

O:  6MAY2021 00:13:49   0.7S   97.6E ML=4.5  EMSC   KEPULAUAN BATU, INDONESIA    

P:  7MAY2021 133412     0.0N   99.0E 4.0-5.5 AABAA  So. Sumatera               

 

O: 05MAY2021 22:27:20   2.2S  140.1E ML=4.3  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O:  6MAY2021 02:41:23   1.5S  139.4E ML=4.5  EMSC   NEAR N COAST OF PAPUA, INDONES

P:  4MAY2021 133436     2.0S  139.0E 4.0-5.5 AAAAA  West Irian, PNG            

 

O:  5MAY2021 20:35:01   3.0S  130.6E ML=4.6  EMSC   CERAM SEA, INDONESIA         

P:  1MAY2021 133417     4.0S  128.0E 4.0-5.4 BABAA  Ceram area                 

 

O:  6MAY2021 02:49:03   3.5S  138.5E ML=4.1  EMSC   PAPUA, INDONESIA             

P:  4MAY2021 133436     2.0S  139.0E 4.0-5.5 ABAAA  West Irian, PNG            

 

O:  5MAY2021 11:57:59   4.2S  135.1E ML=4.2  EMSC   NEAR S COAST OF PAPUA, INDONES

P:  6MAY2021 133435     3.0S  134.0E 4.0-5.6 ABAAA  West Irian, PNG            

 

O:  5MAY2021 16:46:08   5.6S  130.8E ML=4.1  EMSC   BANDA SEA                     

P:  2MAY2021 133438     6.0S  131.0E 4.0-5.5 BAAAA  West Irian, PNG            

 

O:  6MAY2021 06:21:24   6.8N  125.2E Mw=5.1  EMSC   MINDANAO, PHILIPPINES        

P:  9MAY2021 133410     6.0N  125.0E 4.0-5.5 BAAAA  Mindanao, Philippines       

 

NEIC reported this earthquake of M 5.1 in Southern Mindanao, Philippines was felt with intensity II-III in the area(s) of Southern Mindanao, Philippines at Davao, Katangawan, Lasang, Buayan Sampao.

 

O:  5MAY2021 12:40:49   7.8S  106.8E ML=4.0  EMSC   JAVA, INDONESIA              

P:  6MAY2021 133430     7.0S  105.0E 4.0-5.5 AABAA  So. of Java                

 

O:  6MAY2021 04:29:24  13.6N  125.3E ML=4.5  EMSC   PHILIPPINE ISLANDS REGION    

P:  6MAY2021 133451    14.0N  125.0E 3.5-4.9 AAAAA  Luzon, Philippines         

 

CENTRAL AND SOUTH AMERICA

 

O:  5MAY2021 07:47:11   8.0S   74.4W mb=4.5  EMSC   CENTRAL PERU                 

P:  1MAY2021 133415     8.0S   74.0W 3.5-5.1 BAAAA  Brazil                     

 

O:  5MAY2021 07:02:59   2.5S   80.4W ML=4.1  EMSC   NEAR COAST OF ECUADOR        

P:  5MAY2021 133418     1.0S   81.0W 4.0-5.7 ABAAA  Ecuador                    

 

O:  6MAY2021 05:22:44  14.5S   75.4W ML=4.0  EMSC   NEAR COAST OF CENTRAL PERU   

P:  3MAY2021 133637    14.0S   76.0W 4.0-5.4 BAAAA  Central Peru               

 

O:  5MAY2021 20:29:26  15.1N   92.9W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO     

P:  4MAY2021 133444    16.0N   93.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O:  6MAY2021 03:47:16  16.9N   93.9W ML=4.2  EMSC   CHIAPAS, MEXICO              

P:  5MAY2021 133444    16.0N   95.0W 3.5-5.1 AAAAA  Chiapas, Mexico            

 

O:  5MAY2021 08:10:43  17.0N   99.1W ML=4.2  EMSC   GUERRERO, MEXICO             

P:  3MAY2021 133460    16.0N   99.0W 3.5-5.3 AAAAA  Oaxaca, Mexico              

 

O:  5MAY2021 15:00:01  18.0N   66.5W Md=3.0  EMSC   PUERTO RICO                  

O:  6MAY2021 05:56:22  18.8N   67.3W Md=3.2  EMSC   PUERTO RICO REGION           

P:  5MAY2021 133463    18.0N   67.0W 3.4-5.0 AAAAA  Puerto Rico                 

 

O:  5MAY2021 14:53:28  18.4N   73.0W ML=3.5  EMSC   HAITI REGION                 

P:  4MAY2021 133464    19.0N   71.0W 3.4-5.3 AABAA  Puerto Rico                

 

O:  6MAY2021 01:22:51  22.1S   68.6W mb=4.4  EMSC   ANTOFAGASTA, CHILE           

P:  7MAY2021 133658    23.0S   69.0W 4.0-5.6 AAAAA  Coast No. Chile            

 

AFRICA AND EUROPE

 

O:  5MAY2021 16:24:11  36.4N   20.2W ML=4.1  EMSC   AZORES ISLANDS REGION        

 

O:  5MAY2021 06:42:12  40.4N   27.4E ML=4.1  EMSC   WESTERN TURKEY                

P:  5MAY2021 133548    39.0N   28.0E 3.5-5.0 ABAAA  Turkey                     

 

EMSC reported an earthquake of M 4.1 in Western Turkey was felt with intensity II-III in the area(s) of Western Turkey at Biga, Marmara, Erkek, Bandirma, and within about 75 km of the epicenter.

 

O:  5MAY2021 23:40:34  36.4N   27.6E mb=4.4  EMSC   DODECANESE IS.-TURKEY BORDER R

P:  6MAY2021 133488    37.0N   27.0E 3.0-4.8 AAAAA  Aegean Sea                 

 

O:  5MAY2021 17:34:57  51.5N   16.2E ML=3.3  EMSC   POLAND                       

P:  7MAY2021 133607    51.0N   16.0E 3.0-4.4 AAAAA  Poland                     

 

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

 

SOUTHWEST PACIFIC

 

O:  5MAY2021 15:35:45  15.1S  168.2E Mw=5.1  EMSC   VANUATU                      

P:  6MAY2021 133649    15.0S  167.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

O:  6MAY2021 05:27:26  15.8S  177.3W mb=4.6  EMSC   FIJI REGION                  

P:  5MAY2021 133640    15.0S  178.0W 4.0-5.4 AAAAA  Samoa Islands              

 

O:  5MAY2021 20:13:42  18.5S  176.0W mb=4.4  EMSC   FIJI REGION                  

P:  5MAY2021 133647    19.0S  177.0W 4.0-5.6 AAAAA  Tonga Islands              

 

O:  5MAY2021 08:59:23  22.8S  171.1E mb=4.9  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P:  4MAY2021 133660    23.0S  171.0E 4.0-5.6 AAAAA  Loyalty Islands            

 

OCEAN RIDGES

 

O:  5MAY2021 19:20:09  57.0S  147.5E Mw=5.4  EMSC   WEST OF MACQUARIE ISLAND     

 

O:  5MAY2021 21:22:59  30.9S   59.3E mb=5.1  EMSC   SOUTHWEST INDIAN RIDGE       

P:  3MAY2021 133697    32.0S   59.0E 4.0-5.7 ABAAA  So. Indian Ocean           

 

 

ZEALANDIA AND AUSTRALIA REGION

 

 

O:  6MAY2021 01:02:28  34.7S  179.3E ML=3.6  EMSC   SOUTH OF KERMADEC ISLANDS    

O:  5MAY2021 12:37:49  37.6S  179.7E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  4MAY2021 133691    37.0S  180.0E 3.5-5.1 AAAAA  E. of North Islands N.Z.   

 

O: 05MAY2021 11:55:38  43.3S  170.8E ML=4.1  EMSC   SOUTH ISLAND OF NEW ZEALAND

O:  5MAY2021 09:38:00  43.3S  170.8E ML=3.8  EMSC   SOUTH ISLAND OF NEW ZEALAND  

P:  8MAY2021 133707    42.0S  172.0E 3.0-4.9 BBAAA  So. Island, N.Z.           

 

O:  5MAY2021 19:20:09  57.0S  147.5E Mw=5.4  EMSC   WEST OF MACQUARIE ISLAND     

 

JAPAN AND KURIL ISLANDS

 

O:  6MAY2021 00:16:30  32.7N  130.7E ML=4.0  EMSC   KYUSHU, JAPAN                

P:  8MAY2021 133513    32.0N  132.0E 3.5-4.9 AAAAA  Kyushu, Japan area         

 

O:  5MAY2021 07:42:34  40.3N  143.5E mb=4.6  EMSC   OFF EAST COAST OF HONSHU, JAPA

P:  2MAY2021 133559    41.0N  141.0E 3.5-5.4 BABAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 05MAY2021 11:24:38  31.5N  115.7W Ml=3.0  EMSC   BAJA CALIFORNIA, MEXICO

O:  5MAY2021 08:58:30  31.5N  115.7W Ml=3.7  EMSC   BAJA CALIFORNIA, MEXICO      

P:  4MAY2021 133530    32.1N  116.4W 2.5-4.4 AAAAA  So. California             

 

O:  5MAY2021 22:14:56  34.0N  116.6W ML=2.7  EMSC   SOUTHERN CALIFORNIA          

P:  3MAY2021 133533    33.9N  116.9W 2.5-4.8 AAAAA  So. California             

 

NEIC reported this earthquake of M 3.0 in Southern California was felt with intensity II-III in the area(s) of Southern California at Morongo, Desert Hot Springs, Yucca Valley, Banning, Joshua Tree, Palm Desert, Mira Loma, and Corona.

 

O:  6MAY2021 05:47:16  34.0N  117.6W Ml=2.2  EMSC   GREATER LOS ANGELES AREA, CALI

P:  5MAY2021 133535    34.1N  117.4W 2.5-4.8 AAAAA  So. California             

 

O:  5MAY2021 14:38:07  35.0N  118.8W Ml=2.3  EMSC   CENTRAL CALIFORNIA           

P:  3MAY2021 133487    35.3N  118.6W 2.5-2.7 AAAAA  So. California             

 

O:  5MAY2021 09:23:51  36.1N  119.2W Ml=2.1  EMSC   CENTRAL CALIFORNIA           

P:  6MAY2021 133539    35.6N  118.4W 2.5-5.2 AAAAA  So. California             

 

O:  5MAY2021 14:58:49  36.2N  120.3W Md=2.6  EMSC   CENTRAL CALIFORNIA           

P:  2MAY2021 133498    36.1N  120.1W 2.5-4.8 BAAAA  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 in Los Banos and Gustine.

 

O: 05MAY2021 11:32:06  36.6N  118.0W Ml=2.1  EMSC   CENTRAL CALIFORNIA

O: 05MAY2021 13:58:21  36.6N  118.0W Ml=2.4  EMSC   CENTRAL CALIFORNIA

O:  5MAY2021 09:55:21  36.6N  118.0W Ml=2.8  EMSC   CENTRAL CALIFORNIA           

P:  7MAY2021 133491    36.3N  118.1W 2.5-5.1 AAAAA  California/Nevada area     

 

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

 

O:  5MAY2021 14:28:10  37.5N  118.8W Md=2.3  EMSC   CENTRAL CALIFORNIA           

P:  7MAY2021 133495    37.5N  118.6W 2.5-4.6 AAAAA  California/Nevada area     

 

O: 05MAY2021 14:17:45  38.2N  117.7W ML=2.5  EMSC   NEVADA

O: 06MAY2021 02:34:05  38.2N  117.7W ml=2.0  EMSC   NEVADA

O:  5MAY2021 18:33:16  38.1N  118.0W ml=2.7  EMSC   NEVADA                       

P:  4MAY2021 133495    38.0N  118.8W 2.5-4.6 AAAAA  California/Nevada area     

 

O:  5MAY2021 23:59:39  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P:  4MAY2021 133501    38.9N  122.8W 2.5-4.6 AAAAA  Central California         

 

O:  5MAY2021 13:06:28  39.4N  123.3W Md=2.8  EMSC   NORTHERN CALIFORNIA          

P:  7MAY2021 133502    39.3N  123.2W 2.5-4.6 AAAAA  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 Redwood Valley, Willits, Potter Valley, Ukiah, Fort Bragg and Mendocino.

 

O:  5MAY2021 08:39:09  39.6N  120.4W Md=2.4  EMSC   NORTHERN CALIFORNIA          

P:  6MAY2021 133496    39.3N  120.0W 2.5-4.5 AAAAA  California/Nevada area     

 

O:  5MAY2021 21:30:02  40.4N  124.6W Md=2.5  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  4MAY2021 133576    40.2N  124.2W 2.5-4.5 AAAAA  Off Coast of No. Calif     

 

 

ALASKA

 

O:  5MAY2021 17:15:49  52.2N  173.6E mb=4.5  EMSC   NEAR ISLANDS, ALEUTIAN ISLANDS

P:  2MAY2021 133609    51.0N  176.0E 4.0-5.9 BBBAA  Rat Islands                

 

O:  6MAY2021 00:19:42  54.5N  161.6W mb=4.8  EMSC   ALASKA PENINSULA             

P:  5MAY2021 133614    54.5N  161.8W 3.5-5.3 AAAAA  Unimak Islands, Aleutians  

 

O:  5MAY2021 18:04:25  67.5N  159.0W ML=3.4  EMSC   NORTHERN ALASKA              

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  5MAY2021 20:59:12  47.4N  117.9W Ml=2.2  EMSC   WASHINGTON                   

P:  6MAY2021 133568    47.5N  115.8W 2.0-4.1 AABAA  Montana/Idaho              

 

O:  4MAY2021 21:41:15  48.8N  129.3W MB=3.3  ECAN Port Alice, BC                 

P:  4MAY2021 133587    49.3N  129.0W 2.8-5.3 AAAAA  Vancouver Island area      

 

ROCKY MOUNTAINS REGION

 

O:  5MAY2021 17:29:21  44.3N  115.2W Ml=2.3  EMSC   SOUTHERN IDAHO               

P:  4MAY2021 133566    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

O: 05MAY2021 10:44:39  32.0N  102.3W mb=2.4  EMSC   WESTERN TEXAS

O:  5MAY2021 13:00:11  32.1N  102.2W mb=2.4  EMSC   WESTERN TEXAS                

P:  8MAY2021 133528    32.5N  103.6W 2.0-3.9 BAAAA  SW U.S.A                   

 

NEIC reported this earthquake of M 2.5 in Western Texas was felt with intensity II-III in the area(s) of Western Texas at Gardendale and Odessa.

 

EASTERN U.S./CANADA

 

O: 05MAY2021 02:57:57  47.7N   69.8W MB=1.4  ECAN Charlevoix Seismic Zone.      

O: 05MAY2021 06:53:21  47.5N   70.1W MB=1.4  ECAN Charlevoix Seismic Zone.       

O:  5MAY2021 07:47:25  47.8N   70.0W MB=1.5  ECAN Charlevoix Seismic Zone.       

P:  4MAY2021 133564    47.0N   69.0W 2.0-3.9 AAAAA  Maine                      

 

O: 05MAY2021 04:00:29  73.4N   90.3W MB=1.7  ECAN Arctic Bay, NU   

O:  4MAY2021 20:38:24  73.0N   89.6W MB=2.0  ECAN Arctic Bay, NU                 

P:  7MAY2021 133628    64.0N   87.0W 2.5-4.1 BDAAA  Nunavit/Hudson Bay, Canada 

 

O:  4MAY2021 22:07:43  72.0N   75.0W MB=2.5  ECAN Pond Inlet, NU                 

P:  3MAY2021 133633    73.3N   73.5W 2.5-4.2 AAAAA  Baffin/Davis Strait Canada 

 

HAWAII

 

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

 

MODERATE QUAKES CONTINUE IN SOUTHERN SUMATRA, INDONESIA

 

EARTHQUAKE SUMMARY FOR  MAY 4, 2021

 

An M 5.7 earthquake in the Mentawai Region off southern Sumatra, Indonesia was the strongest in the world today.  BMG reported it was felt with intensity III-IV in the epicentral area of Mentawai. This area has been active since an M 6.3  on November 17, 2020, The last in this area of equal or larger magnitude in the Mentawai area. The last event near this was an M 5.6 on May 2, 2021. At that time this summary noted in this regard:

 

"An earthquake of M 5.6 (EMSC) -5.7 (BMG)  also occurred today in the area of Sumatra near Mentawai. BMG reported it was felt with intensity III-IV in the epicentral area of Mentawai. The last earthquake of M>=5.6 in this area was an M 5.6 north of this of March 5 following the M 8.1 in the Kermadec Islands of March 4, 2021 and prior to that an M 5.9 on November 17, 2020. Forecast 133431 had expected today's event within about 100 km was likely around May 4." (May 3, 2021)

 

Forecast 133431 had expected today's earthquake was likely within about 100 km  around May 4. The antipode of this epicenter is in southern Colombia and Ecuador at 2N 80W - an area which is currently active and could see triggered antipodal seismicity with strong events in this area of Indonesia.

 

 

O:  5MAY2021 01:24:35   1.9S   99.8E Mw=5.7  EMSC   KEP. MENTAWAI REGION, INDONESI

P:  4MAY2021 133431     2.0S   99.0E 4.0-5.4 AAAAA  So. of Sumatera            

 

A series of earthquakes of M 5.0, 5.2 and 5.5 occurred today in central Tonga. These were not reported felt in this remote area. The last earthquake within  about 150 km of this epicenter with M>=5.5 occurred as an M 5.5 September 6, 2020 but the last such quake of larger magnitude in ths area was an M 6.1 on June 15, 2019. Forecast 133672 had expected today's event within about 100 km of this epicenter was likely around May 4. This activity is at the fifth node (72 degrees) from the M 6.8 in Japan of May 3 and may have been promoted by energy from that source.

 

O: 05MAY2021 01:17:28  20.6S  173.8W mb=5.2  EMSC   TONGA

O: 05MAY2021 05:16:35  20.7S  173.3W mb=5.0  EMSC   TONGA

O:  4MAY2021 19:51:43  20.8S  173.8W Mw=5.5  EMSC   TONGA                        

P:  4MAY2021 133672    20.0S  174.0W 4.0-5.5 AAAAA  Tonga Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the Fox Islands, Aleutians. It was not reported felt in this remote area. This is the largest earthquake within about 200 km of this epicenter this year and since an M 6.4 about 200 km to the east on December 1, 2020. The last within about 100 km of this epicenter was an M 5.8 on August 15, 2020 and a following event of M 5.6 on September 27, 2020. Forecast 133597 had expected today's event was likely within about 50 km around May 4.

 

O:  4MAY2021 16:47:43  52.4N  170.6W mb=4.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  4MAY2021 133597    52.1N  171.3W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

A regional aftershock occurred in Siberia today about 300 km west of the M 5.7 on the Russia-Mongolia earthquake that occurred yesterday. The last earthquake within about 200 km of today's epicenter with M>=4.7 was an M 4.7 and 5.0 on September 13, 2019. An M 7.3 earthquake hit this area on September 27, 2003. Forecast 133611 had expected today's event within about 100 km was likely around May 1.

 

O:  5MAY2021 06:57:55  49.9N   86.7E mb=4.7  EMSC   RUSSIA-KAZAKHSTAN BORDER REGIO

P:  1MAY2021 133611    50.0N   88.0E 3.0-4.6 BAAAA  So. Siberia                

 

Two large asteroids will make a near approach to the earth this week. A meteor shower is also likely to occur. Asteroid 2021 AFB passed nearby at 12:14 UT today (May 4) with magnitude 20.2. The Eta Aquariids Meteor shower is also visible on the morning of May 5-6 especially in the southern Hemisphere. These phenomena are not expected to impact global seismicity.

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:  4MAY2021 22:42:56  22.9N  121.4E ML=4.4  TAI    Hualien, Taiwan              

O:  4MAY2021 16:05:23  24.5N  122.9E mb=4.6  EMSC   TAIWAN REGION                

P:  3MAY2021 133485    24.0N  124.0E 4.0-5.5 AAAAA  Taiwan                     

P:  4MAY2021 133485    22.0N  122.0E 4.0-5.6 AAAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity II in Taitung and I in Hualien, Kaohsiung and Pingtung Counties, Taiwan.

 

O:  5MAY2021 06:57:55  49.9N   86.7E mb=4.7  EMSC   RUSSIA-KAZAKHSTAN BORDER REGIO

P:  1MAY2021 133611    50.0N   88.0E 3.0-4.6 BAAAA  So. Siberia                

 

O:  5MAY2021 06:07:55  53.8N  160.1E mb=4.0  EMSC   NEAR EAST COAST OF KAMCHATKA 

P:  5MAY2021 133599    53.0N  160.0E 4.0-5.4 AAAAA  E. of Kamchatka            

 

INDONESIA AND PHILIPPINES

 

 

O:  4MAY2021 21:53:38   0.1S  123.7E ML=4.1  EMSC   SULAWESI, INDONESIA          

P:  5MAY2021 133433     1.0S  122.0E 4.0-5.5 AABAA  Sulawesi area               

 

O:  4MAY2021 19:50:22   0.5N  126.2E mb=4.5  EMSC   MOLUCCA SEA                  

P:  1MAY2021 133409     1.0N  126.0E 4.0-5.6 BAAAA  Mindanao, Philippines      

 

O:  4MAY2021 22:59:10   1.5N  127.3E Mw=5.0  EMSC   HALMAHERA, INDONESIA         

P:  3MAY2021 133406     1.0N  128.0E 4.0-5.5 AAAAA  Halmahera                  

 

O:  5MAY2021 01:24:35   1.9S   99.8E Mw=5.7  EMSC   KEP. MENTAWAI REGION, INDONESI

P:  4MAY2021 133431     2.0S   99.0E 4.0-5.4 AAAAA  So. of Sumatera            

 

O:  4MAY2021 19:20:46   6.6S  130.3E mb=4.2  EMSC   BANDA SEA                    

O: 05MAY2021 06:07:49   7.0S  131.2E ML=4.0  EMSC   KEP. TANIMBAR REGION, INDONESIA

P:  2MAY2021 133438     6.0S  131.0E 4.0-5.5 AAAAA  West Irian, PNG            

P:  5MAY2021 133438     7.0S  130.0E 4.0-5.4 AAAAA  West Irian, PNG            

 

O:  4MAY2021 14:02:56   7.7S  106.1E ML=4.1  EMSC   JAVA, INDONESIA              

P:  6MAY2021 133430     7.0S  105.0E 4.0-5.5 AAAAA  So. of Java                

 

O:  4MAY2021 22:31:15   8.8N   94.2E mb=4.9  EMSC   NICOBAR ISLANDS, INDIA REGION

P:  9MAY2021 133439    10.0N   93.0E 4.0-5.6 BBAAA  Andaman Islands            

 

 

CENTRAL AND SOUTH AMERICA

 

O:  4MAY2021 15:15:35   7.6S   75.0W ML=4.1  EMSC   NORTHERN PERU                

P:  1MAY2021 133426     6.0S   76.0W 4.0-5.4 BBAAA  No. Peru                   

 

O:  5MAY2021 07:02:59   2.5S   80.4W ML=4.1  EMSC   NEAR COAST OF ECUADOR        

P:  5MAY2021 133418     1.0S   81.0W 4.0-5.7 ABAAA  Ecuador                    

 

O:  4MAY2021 08:01:47   4.8S   76.5W mb=4.6  EMSC   NORTHERN PERU                

P:  1MAY2021 133426     6.0S   76.0W 4.0-5.4 BBAAA  No. Peru                   

 

O:  4MAY2021 13:50:54  14.0N   93.1W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P:  6MAY2021 133443    14.0N   93.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 04MAY2021 18:45:37  15.4N   94.6W ML=3.7  EMSC   OFFSHORE OAXACA, MEXICO

O:  4MAY2021 07:27:16  15.4N   94.8W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P:  5MAY2021 133444    16.0N   95.0W 3.5-5.1 AAAAA  Chiapas, Mexico            

 

O:  4MAY2021 16:04:06  15.9S   75.4W mb=4.7  EMSC   NEAR COAST OF CENTRAL PERU   

P:  4MAY2021 133643    16.0S   74.0W 4.0-5.5 AABAA  So. Peru/Bolivia           

 

O:  4MAY2021 07:19:16  18.3N   63.0W ML=3.7  EMSC   ANGUILLA REGION, LEEWARD ISLAN

P:  3MAY2021 133450    19.0N   65.0W 3.0-5.1 AABAA  Leeward Islands            

P:  7MAY2021 133450    18.0N   65.0W 3.0-5.1 BABAA  Leeward Islands            

 

NEIC reported this earthquake of M 3.7 in Anguilla, Leeward Islands was felt with intensity II-III in the area(s) of Anguilla, Leeward Islands in Marigot, Saint Martin, Guadeloupe, The Valley, Anguilla (V) and Orincess Quarter, Sint Maarten, Netherlands Antilles.

It was preceded by an M 3.3 foreshock which was felt in the same area.

 

O:  4MAY2021 11:57:06  19.5N   68.7W ML=3.0  EMSC   DOMINICAN REPUBLIC REGION    

P:  5MAY2021 133469    20.0N   68.0W 3.0-4.7 AAAAA  Bahamas/No. Caribbean      

 

O:  4MAY2021 19:54:31  22.5S   67.7W mb=4.4  EMSC   POTOSI, BOLIVIA               

P:  7MAY2021 133652    23.0S   67.0W 4.0-5.6 BAAAA  Argentina                  

 

O:  4MAY2021 17:52:55  22.9S   68.8W mb=4.3  EMSC   ANTOFAGASTA, CHILE           

P:  4MAY2021 133659    24.0S   69.0W 4.0-5.4 ABAAA  Coast No. Chile             

P:  7MAY2021 133658    23.0S   69.0W 4.0-5.6 BAAAA  Coast No. Chile            

 

O:  4MAY2021 13:15:47  26.7S   67.7W ML=4.6  EMSC   CATAMARCA, ARGENTINA         

P:  5MAY2021 133654    28.0S   67.0W 4.0-5.5 ABAAA  Argentina                  

 

O:  4MAY2021 15:18:22  33.9S   72.4W mb=4.7  EMSC   OFFSHORE O'HIGGINS, CHILE    

O:  4MAY2021 08:54:10  34.6S   73.1W mb=4.1  EMSC   OFFSHORE MAULE, CHILE        

P:  7MAY2021 133683    34.0S   73.0W 4.0-5.7 BAAAA  Central Chile              

 

NEIC reported this earthquake of M 4.7 in O'Higgins, Chile was felt with intensity II-III in the area(s) of  San Antonio, Valparaiso, Chile.

 

AFRICA AND EUROPE

 

O:  4MAY2021 15:02:02  34.0N   25.6E mb=4.4  EMSC   CRETE, GREECE                

P:  5MAY2021 133508    34.0N   26.0E 3.0-5.1 AAAAA  Crete                      

 

EMSC reported an earthquake of M 4.1 in Western Turkey was felt with intensity II-III in the area(s) of Western Turkey at Biga, Marmara, Erkek, Bandirma, and within about 75 km of the epicenter.

 

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

 

SOUTHWEST PACIFIC

 

 

O:  5MAY2021 05:05:51  15.5S  173.6W mb=4.6  EMSC   TONGA                        

P:  5MAY2021 133640    15.0S  175.0W 4.0-5.7 AABAA  Samoa Islands               

 

O: 05MAY2021 01:17:28  20.6S  173.8W mb=5.2  EMSC   TONGA

O: 05MAY2021 05:16:35  20.7S  173.3W mb=5.0  EMSC   TONGA

O:  4MAY2021 19:51:43  20.8S  173.8W Mw=5.5  EMSC   TONGA                        

P:  4MAY2021 133672    20.0S  174.0W 4.0-5.5 AAAAA  Tonga Islands              

 

O:  4MAY2021 13:33:22  17.6S  167.9E Mw=5.0  EMSC   VANUATU                      

P:  3MAY2021 133649    17.0S  167.0E 4.0-5.6 AAAAA  Vanuatu Islands            

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  4MAY2021 13:36:02  36.0S  178.3E ML=3.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  4MAY2021 133691    37.0S  180.0E 3.5-5.1 AABAA  E. of North Islands N.Z.   

 

O:  5MAY2021 03:58:19  54.6S  158.9E mb=4.9  EMSC   MACQUARIE ISLAND REGION      

 

 

JAPAN AND KURIL ISLANDS

 

O:  4MAY2021 22:28:09  42.4N  144.6E mb=4.3  EMSC   HOKKAIDO, JAPAN REGION       

P:  1MAY2021 133559    43.0N  145.0E 3.5-5.5 BAAAA  Hokkaido, Japan            

 

O:  4MAY2021 18:10:43  37.2N  141.8E mb=5.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  3MAY2021 133525    38.0N  141.0E 4.0-6.6 AAAAA  Off East Coast Honshu      

 

NEIC reported this earthquake of M 4.9 off eastern Honshu, Japan  was felt with intensity II-III in the area(s) of Honshu, Japan in Miyagi Prefecture.

 

O:  4MAY2021 19:32:59  43.3N  146.6E mb=4.8  EMSC   KURIL ISLANDS                

P:  1MAY2021 133559    43.0N  145.0E 3.5-5.5 BAAAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O:  4MAY2021 14:16:23  31.4N  115.5W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO      

P:  4MAY2021 133530    32.1N  116.4W 2.5-4.4 AAAAA  So. California             

 

O:  4MAY2021 19:23:52  33.8N  118.5W ML=2.6  EMSC   SANTA MONICA BAY, CALIFORNIA 

P:  4MAY2021 133534    34.3N  118.5W 2.5-5.2 AAAAA  So. California             

 

NEIC reported this earthquake of M 2.6 in Santa Monica Bay, California was felt with intensity II-III in the area(s) of Santa Monica Bay, California in Hermosa Beach, Manhattan Beach, Redondo Beach, El Segundo, Torrance, Palos Verdes, Rancho Palos and Playa del Rey.

 

O:  4MAY2021 13:31:44  35.8N  116.6W ML=2.3  EMSC   SOUTHERN CALIFORNIA          

O:  4MAY2021 20:49:55  35.9N  115.2W ml=2.1  EMSC   NEVADA                        

P:  2MAY2021 133538    35.5N  116.4W 2.5-4.5 AAAAA  So. California             

 

O:  4MAY2021 12:36:14  36.7N  121.0W Ml=3.4  EMSC   CENTRAL CALIFORNIA           

P:  2MAY2021 133499    36.7N  121.4W 2.5-4.5 AAAAA  Central California          

 

NEIC reported this earthquake of M 3.4 in Central California was felt with intensity II-III in the area(s) of Central California in Los Banos, Hollister and San Juan Bautista.

 

O: 04MAY2021 20:40:12  38.2N  117.7W ml=2.2  EMSC   NEVADA

O: 05MAY2021 01:10:08  38.2N  117.7W ml=2.0  EMSC   NEVADA

O: 05MAY2021 06:21:25  38.2N  117.8W ml=2.5  EMSC   NEVADA

O:  4MAY2021 17:36:03  38.2N  117.7W ML=2.4  EMSC   NEVADA                       

P:  4MAY2021 133495    38.0N  118.8W 2.5-4.6 AAAAA  California/Nevada area     

 

O:  4MAY2021 13:55:59  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P:  4MAY2021 133501    38.9N  122.8W 2.5-4.6 AAAAA  Central California         

 

O:  4MAY2021 12:49:26  40.2N  123.9W Md=2.0  EMSC   NORTHERN CALIFORNIA           

O: 04MAY2021 07:37:39  40.9N  124.2W ML=2.5  EMSC   OFFSHORE NORTHERN CALIFORNIA

O:  4MAY2021 21:38:48  40.4N  124.7W ML=2.3  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  4MAY2021 133576    40.2N  124.2W 2.5-4.5 AAAAA  Off Coast of No. Calif     

 

NEIC reported this earthquake of M 3.0 off the coast of Northern California   was felt with intensity II-III in the area(s) of  Northern California in Eureka, Arcata, Bayside, McKinleyville, Fortuna, Blue Lake.

 

ALASKA

 

O:  4MAY2021 16:47:43  52.4N  170.6W mb=4.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  4MAY2021 133597    52.1N  171.3W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

O: 04MAY2021 07:31:50  58.4N  154.8W ML=3.3  EMSC   ALASKA PENINSULA

P:  4MAY2021 133619    60.2N  153.2W 3.2-4.9 ABAAA  Central Alaska             

 

O:  5MAY2021 00:23:38  60.1N  151.7W ML=3.8  EMSC   KENAI PENINSULA, ALASKA      

P:  2MAY2021 133620    60.5N  151.5W 3.2-4.9 AAAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.6 in the Kenai Peninsula, Alaska was felt with intensity II-III in the area(s) of the Kenai Peninsula, Alaska at Ninilchik, Kasilof, Homer, Sodotna, Kenai, Seward and Anchorage.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  4MAY2021 13:38:34  45.4N  117.6W Ml=2.2  EMSC   OREGON                        

P:  6MAY2021 133568    47.5N  115.8W 2.0-4.1 ABAAA  Montana/Idaho              

 

O:  4MAY2021 18:21:16  46.7N  121.1W Md=2.2  EMSC   WASHINGTON                   

P:  2MAY2021 133588    46.9N  122.0W 2.0-3.9 AAAAA  Washington state, U.S.      

 

O:  4MAY2021 08:35:29  49.4N  127.8W MB=3.0  ECAN Port Alice, BC                 

O:  4MAY2021 08:35:29  49.4N  127.8W ML=3.0  EMSC   VANCOUVER ISLAND, CANADA REGIO

P:  4MAY2021 133587    49.3N  129.0W 2.8-5.3 AAAAA  Vancouver Island area      

 

O:  4MAY2021 20:59:21  47.6N  122.1W Md=2.7  EMSC   SEATTLE-TACOMA AREA, WASHINGTO

P:  1MAY2021 133588    47.5N  121.8W 2.0-4.2 BAAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O:  4MAY2021 21:07:09  43.3N  111.1W Ml=2.3  EMSC   SOUTHERN IDAHO                

P:  4MAY2021 133590    43.2N  111.0W 2.0-4.3 AAAAA  Yellowstone/Wyoming        

 

O: 04MAY2021 13:59:31  44.3N  115.1W Ml=2.2  EMSC   SOUTHERN IDAHO

O: 04MAY2021 23:02:59  44.5N  115.2W Ml=2.1  EMSC   SOUTHERN IDAHO

O:  4MAY2021 10:52:53  44.3N  115.1W Ml=2.3  EMSC   SOUTHERN IDAHO               

P:  4MAY2021 133566    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

O:  4MAY2021 17:55:15  47.4N  116.6W Ml=2.1  EMSC   NORTHERN IDAHO               

P:  6MAY2021 133568    47.5N  115.8W 2.0-4.1 AAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O:  4MAY2021 21:59:24  35.2N   95.3W mb=2.4  EMSC   OKLAHOMA                     

P:  5MAY2021 133546    35.0N   96.0W 2.0-4.1 AAAAA  Southern Plains            

 

O:  5MAY2021 03:36:25  36.7N   97.7W ML=2.2  EMSC   OKLAHOMA                     

P:  9MAY2021 133546    36.0N   97.0W 2.0-4.5 BAAAA  Southern Plains            

 

O:  4MAY2021 10:06:09  46.8N   78.2W MB=2.6  ECAN Mattawa, ON                    

P:  4MAY2021 133579    46.0N   81.0W 2.0-4.0 AACAA  Ohio/Lake Erie             

 

O:  3MAY2021 18:48:00  50.8N   64.1W MB=1.9  ECAN Mingan, QC                     

P:  5MAY2021 133558    49.0N   66.0W 2.0-3.9 ABBAA  E. of Maine                

 

O:  3MAY2021 08:17:07  44.4N   77.0W MB=1.7  ECAN Napanee, ON                    

P:  2MAY2021 133572    43.0N   78.0W 2.0-4.2 ABAAA  New York State             

 

HAWAII

 

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

 

MODERATE QUAKE FELT IN MONGOLIA AND SIBERIA

 

EARTHQUAKE SUMMARY FOR  MAY 3, 2021

 

The strongest earthquake in the world today was an M 5.6 on the Russia-Mongolia border. NEIC reported it was felt with intensity III in Irkutsk, Russia and in Mongolia at Zuumharaa and Ulaanbaatar. This is the first earthquake within about 200 km of this epicenter with M>=5.6 since an M 6.7 on January 11, 2021 and is probably an aftershock of that event, the largest in the area in at least 30 years. An M 5.6 occurred about 300 km to the northeast of this event on September 21, 2020, the first in this larger region since an M 6.2 on August 27, 2008. At the time of the event in January, 2021, this summary noted in this regard:

 

"The only earthquake within about 300 km of this epicenter of equal or larger magnitude in this region near the Russia-Mongolia border was an M 6.7 about 300 km to the west on February 26, 2012 - the only such event in this region in the past 30 years. This epicenter is at the seventh node (52 degrees) from both the Dodecanese Islands of October 30, 2020 and from the M 7.6 in the Alaska Peninsula of October 19, 2020. It was probably promoted by energy from these sources. One of the strongest earthquakes in this area in recent times occurred as an M 7.5 on January 12, 1862 .." (January 12, 2021)

 

Forecast 133611 had expected today's event in southern Siberia within about

150 km of this epicenter was likely around May 1. 

 

O: 03MAY2021 08:58:52  51.4N  100.4E mb=4.0  EMSC   RUSSIA-MONGOLIA BORDER REGION

O: 03MAY2021 14:11:38  51.4N  100.4E mb=4.2  EMSC   RUSSIA-MONGOLIA BORDER REGION

O:  3MAY2021 08:46:38  51.3N  100.5E Mw=5.6  EMSC   RUSSIA-MONGOLIA BORDER REGION

P:  1MAY2021 133611    51.0N   98.0E 3.0-4.7 AABAA  So. Siberia                

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:  3MAY2021 22:44:48  23.4N   94.1E ML=3.9  EMSC   MYANMAR                      

P:  3MAY2021 133477    23.0N   94.0E 4.0-5.4 AAAAA  Myanmar                    

 

O:  3MAY2021 11:42:39  36.7N   94.1E mb=4.6  EMSC   NORTHERN QINGHAI, CHINA      

P: 26APR2021 133254    36.0N   94.0E 3.8-5.2 CAAAA  Xizang                      

 

O:  3MAY2021 21:57:14  38.2N   75.6E mb=4.2  EMSC   SOUTHERN XINJIANG, CHINA     

O:  3MAY2021 19:13:39  38.6N   73.4E mb=4.5  EMSC   TAJIKISTAN                   

P:  7MAY2021 133510    38.0N   74.0E 3.8-5.5 BAAAA  Hindu Kush/Pakistan        

 

NEIC reported this earthquake of M 4.5 in Tajikistan was felt with intensity II-III in the area(s) of Tajikistan at Murgob.

 

O: 03MAY2021 08:58:52  51.4N  100.4E mb=4.0  EMSC   RUSSIA-MONGOLIA BORDER REGION

O: 03MAY2021 08:58:52  51.4N  100.4E mb=4.0  EMSC   RUSSIA-MONGOLIA BORDER REGION

O: 03MAY2021 14:11:38  51.4N  100.4E mb=4.2  EMSC   RUSSIA-MONGOLIA BORDER REGION

O:  3MAY2021 08:46:38  51.3N  100.5E Mw=5.6  EMSC   RUSSIA-MONGOLIA BORDER REGION

P:  1MAY2021 133611    51.0N   98.0E 3.0-4.7 AABAA  So. Siberia                

 

O:  3MAY2021 15:19:57  53.8N  160.5E mb=4.5  EMSC   NEAR EAST COAST OF KAMCHATKA 

P:  5MAY2021 133599    53.0N  160.0E 4.0-5.4 AAAAA  E. of Kamchatka            

 

INDONESIA AND PHILIPPINES

 

O:  3MAY2021 14:11:25   0.3N   96.6E ML=4.6  EMSC   NIAS REGION, INDONESIA       

P:  3MAY2021 133412     2.0N   98.0E 4.0-5.6 ABBAA  So. Sumatera               

P:  9MAY2021 133411     1.0N   97.0E 4.0-5.7 CAAAA  Nicobar Islands            

 

O:  3MAY2021 12:50:34   1.2N  126.5E mb=4.6  EMSC   MOLUCCA SEA                  

P:  1MAY2021 133409     1.0N  126.0E 4.0-5.6 AAAAA  Mindanao, Philippines      

 

O:  3MAY2021 14:40:16   1.6S  120.1E ML=4.5  EMSC   SULAWESI, INDONESIA          

P:  4MAY2021 133398     0.0N  120.0E 4.0-5.7 ABAAA  Celebes Sea                

 

O:  4MAY2021 05:23:47   3.1S  136.0E ML=4.7  EMSC   PAPUA, INDONESIA             

O: 04MAY2021 06:38:58   3.1S  135.9E ML=4.5  EMSC   PAPUA, INDONESIA

P:  2MAY2021 133437     4.0S  136.0E 4.0-5.4 AAAAA  West Irian, PNG            

 

O: 03MAY2021 15:26:48   4.3N  126.8E ML=4.0  EMSC   KEPULAUAN TALAUD, INDONESIA

O: 03MAY2021 15:21:55   4.9N  127.0E ML=4.4  EMSC   KEPULAUAN TALAUD, INDONESIA

O:  3MAY2021 16:30:20   4.9N  126.8E ML=4.2  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  2MAY2021 133410     5.0N  126.0E 4.0-5.6 AAAAA  Mindanao, Philippines      

 

O:  3MAY2021 22:59:24   6.5S  130.2E ML=4.3  EMSC   BANDA SEA                    

P:  2MAY2021 133438     6.0S  131.0E 4.0-5.5 AAAAA  West Irian, PNG            

 

 

CENTRAL AND SOUTH AMERICA

 

O:  3MAY2021 11:46:48   6.2S   81.4W mb=4.6  EMSC   NEAR COAST OF NORTHERN PERU  

P:  3MAY2021 133427     9.0S   81.0W 4.0-5.8 ACAAA  No. Peru                   

 

O:  3MAY2021 20:47:21  15.1S   72.7W mb=4.6  EMSC   SOUTHERN PERU                 

P:  4MAY2021 133637    15.0S   71.0W 4.0-5.6 AABAA  Central Peru               

 

O:  4MAY2021 02:44:01  14.3S   72.8W ML=4.0  EMSC   CENTRAL PERU                 

P:  4MAY2021 133637    15.0S   71.0W 4.0-5.6 AABAA  Central Peru                

 

O:  3MAY2021 07:05:42  16.0N   98.4W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

O: 03MAY2021 06:58:35  16.1N   98.4W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

P:  1MAY2021 133461    17.0N   98.0W 3.5-5.2 AAAAA  Oaxaca, Mexico             

 

O:  3MAY2021 20:59:05  17.3N   95.1W ML=4.1  EMSC   OAXACA, MEXICO               

P:  5MAY2021 133444    16.0N   95.0W 3.5-5.1 ABAAA  Chiapas, Mexico            

 

O:  3MAY2021 21:35:22  18.5N   68.0W Md=3.3  EMSC   DOMINICAN REPUBLIC REGION    

O: 03MAY2021 18:19:08  18.9N   67.7W Md=3.1  EMSC   PUERTO RICO REGION

P:  5MAY2021 133463    18.0N   67.0W 3.4-5.0 AAAAA  Puerto Rico                

 

O:  3MAY2021 15:49:56  19.4S   69.4W mb=4.0  EMSC   TARAPACA, CHILE              

P:  4MAY2021 133671    20.0S   71.0W 4.0-5.4 AABAA  So. Peru/Bolivia           

P:  5MAY2021 133643    18.0S   69.0W 4.0-5.4 ABAAA  So. Peru/Bolivia           

 

NEIC reported this earthquake of M 4.0 in Tarapaca, Chile was felt with intensity II-III in the area(s) of Tarapaca, Chile at Iquique.

 

 

AFRICA AND EUROPE

 

O:  3MAY2021 22:57:04  46.6N   13.9E ML=2.2  EMSC   AUSTRIA                      

P:  3MAY2021 133554    46.0N   13.0E 3.0-5.3 AAAAA  Austria                    

 

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

 

SOUTHWEST PACIFIC

 

O:  3MAY2021 13:58:10  14.4S  167.4E mb=4.5  EMSC   VANUATU                      

P:  6MAY2021 133649    15.0S  167.0E 4.0-5.4 BAAAA  Vanuatu Islands            

 

O:  3MAY2021 07:46:55  16.5S  174.4W mb=4.5  EMSC   TONGA                         

P:  5MAY2021 133640    15.0S  175.0W 4.0-5.7 ABAAA  Samoa Islands              

 

O:  3MAY2021 19:29:37  20.6S  178.3W mb=4.6  EMSC   FIJI REGION                  

P:  6MAY2021 133674    20.0S  179.0W 4.0-5.7 BAAAA  Tonga Islands               

 

O:  3MAY2021 21:05:26  26.2S  178.8E ML=4.4  EMSC   SOUTH OF FIJI ISLANDS        

P:  3MAY2021 133677    25.0S  179.0E 4.0-5.4 ABAAA  Tonga/Fiji                 

 

O: 03MAY2021 16:07:54  21.9S  177.5W mb=4.8  EMSC   FIJI REGION

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia

today. GeoNet did not report any felt events in the area.

 

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:  4MAY2021 03:06:32  33.2N  116.4W Ml=2.0  EMSC   SOUTHERN CALIFORNIA          

P:  2MAY2021 133530    32.4N  115.8W 2.5-4.4 AAAAA  So. California             

 

O:  3MAY2021 16:36:04  35.9N  117.7W Ml=2.3  EMSC   CENTRAL CALIFORNIA           

P:  4MAY2021 133491    36.1N  118.1W 2.5-5.1 AAAAA  California/Nevada area     

P:  6MAY2021 133540    35.8N  117.6W 2.5-5.0 BAAAA  So. California             

 

O:  3MAY2021 20:24:54  36.3N  119.7W Md=2.5  EMSC   CENTRAL CALIFORNIA           

P:  2MAY2021 133498    36.1N  120.1W 2.5-4.8 AAAAA  Central California         

 

O:  3MAY2021 22:28:59  36.5N  118.0W Ml=2.0  EMSC   CENTRAL CALIFORNIA           

P:  4MAY2021 133491    36.1N  118.1W 2.5-5.1 AAAAA  California/Nevada area     

P:  7MAY2021 133491    36.3N  118.1W 2.5-5.1 BAAAA  California/Nevada area     

 

O:  4MAY2021 05:05:33  36.6N  121.3W Md=2.3  EMSC   CENTRAL CALIFORNIA           

P:  2MAY2021 133499    36.7N  121.4W 2.5-4.5 AAAAA  Central California         

 

O: 04MAY2021 04:48:29  37.5N  119.4W Md=2.4  EMSC   CENTRAL CALIFORNIA

O:  3MAY2021 21:52:08  37.5N  119.4W ML=2.1  EMSC   CENTRAL CALIFORNIA            

P:  3MAY2021 133494    37.3N  119.4W 2.5-4.7 AAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 2.6 in central California was felt with intensity II-III in the area(s) of central California in Yosemite National Park.

 

O: 03MAY2021 07:13:44  38.2N  117.7W ml=2.0  EMSC   NEVADA

O: 03MAY2021 10:34:01  38.2N  117.7W ml=2.2  EMSC   NEVADA

O: 03MAY2021 16:35:00  38.2N  117.8W ML=2.4  EMSC   NEVADA

O: 03MAY2021 20:42:25  38.2N  117.7W ml=2.2  EMSC   NEVADA

O:  3MAY2021 22:59:15  38.2N  117.7W ml=2.1  EMSC   NEVADA                       

P:  4MAY2021 133495    38.0N  118.8W 2.5-4.6 AAAAA  California/Nevada area     

 

O:  3MAY2021 09:19:44  39.7N  123.4W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P:  7MAY2021 133502    39.3N  123.2W 2.5-4.6 BAAAA  Central California         

 

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

 

ALASKA

 

O:  4MAY2021 02:27:27  51.6N  175.3W ml=3.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  2MAY2021 133596    50.6N  174.7W 3.5-5.3 AAAAA  Andreanoff Isls, Aleutians 

 

O:  4MAY2021 02:46:17  56.0N  156.4W ML=3.1  EMSC   ALASKA PENINSULA             

P:  5MAY2021 133593    54.7N  156.9W 3.5-5.1 ABAAA  Alaska Peninsula           

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  1MAY2021 20:41:35  50.7N  114.9W MB=3.1  ECAN Canmore, AB                    

P: 30APR2021 133302    52.0N  115.0W 2.0-4.6 ABAAA  Alberta                    

 

ROCKY MOUNTAINS REGION

 

O:  3MAY2021 10:46:54  31.7N  104.2W ML=3.4  EMSC   WESTERN TEXAS                

P:  5MAY2021 133528    32.0N  104.6W 2.0-3.9 AAAAA  SW U.S.A                   

 

O: 03MAY2021 07:40:50  44.5N  115.2W Ml=2.2  EMSC   SOUTHERN IDAHO

O:  3MAY2021 17:51:47  44.3N  115.2W Ml=2.2  EMSC   SOUTHERN IDAHO               

P:  4MAY2021 133566    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O:  3MAY2021 08:17:07  44.4N   77.0W MB=1.7  ECAN Napanee, ON                    

P:  2MAY2021 133572    43.0N   78.0W 2.0-4.2 ABAAA  New York State             

 

HAWAII

 

O: 03MAY2021 22:44:54  19.2N  155.5W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O:  3MAY2021 22:42:51  19.2N  155.4W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII     

P:  4MAY2021 133448    18.8N  155.2W 3.0-4.4 AAAAA  Hawaii                     

 

STRONG QUAKE NORTHEAST OF TAIWAN FELT IN OKINAWA, JAPAN AND TAIWAN

 

EARTHQUAKE SUMMARY FOR  MAY 2, 2021

 

The strongest earthquake in the world today was an M 5.5 (EMSC) - M 6.4 (CWB) which occurred northeast of Taiwan in the Ryukyu Islands of Japan. NEIC reported it was felt in Taiwan in Taipei and Taoyuan and in Okinawa, Japan at Chatan, Okinawa and Ishikawa. CWB reported this earthquake was felt with intensity II in Hualien and Taitung, I in Tainan, Yunlin, Chiayi, Changhua, Miaoli, Taichung, Nantou, Hsinchu, Yilan Counties, Taiwan. An earthquake of M 5.9 hit about 150 km northeast of this on March 25, 2021 with another of M 6.1 about 200 km southwest of this on December 10, 2020 but the last within about 150 km of this with M>=5.5 was an M 5.7 on February 2, 2016. A major earthquake of M 7.4 hit southwest of today's event exactly 23 years ago on May 3, 1998. It generated a local tsunami (see history section of this summary). The last event in the general area of M>=6.4 was an M 6.4 on May 31, 2016. Forecast 133486 had expected today's event in this area was likely around May 3. This earthquake occurred near local solar noon at a longitude which was expected to see maximum tidal stresses with the past full moon and may have been promoted by those tides.  The seismic forecast in this summary regarding this full moon had read:

 

"The full moon arrived on April 27, 2021 at 03:31 UT. Longitudes which were sub-solar (local solar noon) at this time were near 130 East Longitude while those near local solar midnight area near 50 West longitude. Those in the west include the Atlantic Ocean as far as the eastern Caribbean and the Shetland and South Sandwich Islands and in the east in western Japan, Taiwan, the Philippines and Central Indonesia. These areas may see enhanced seismicity within about 3 days of the full moon." (April 27, 2021)

 

 

O:  3MAY2021 05:07:29  25.8N  123.9E Mw=5.5  EMSC   NORTHEAST OF TAIWAN          

O:  3MAY2021 05:07:31  25.5N  123.9E ML=6.4  TAI    Hualien, Taiwan              

P:  3MAY2021 133485    24.0N  124.0E 4.0-5.5 ABAAA  Taiwan                     

 

An earthquake of M 5.6 (EMSC) -5.7 (BMG)  also occurred today in the area of Sumatra near Mentawai. BMG reported it was felt with intensity III-IV in the epicentral area of Mentawai. The last earthquake of M>=5.6 in this area was an M 5.6 north of this of March 5 following the M 8.1 in the Kermadec Islands of March 4, 2021 and prior to that an M 5.9 on November 17, 2020. Forecast 133431 had expected today's event within about 100 km was likely around May 4.

 

O:  2MAY2021 17:46:41   2.3S   99.8E Mw=5.6  EMSC   KEP. MENTAWAI REGION, INDONESI

P:  4MAY2021 133431     2.0S   99.0E 4.0-5.4 AAAAA  So. of Sumatera            

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in the Alaska Peninsula west of the aftershocks of the M 7.6 of October, 2020.  The last earthquake equal or greater magnitude in this region occurred hours before the M 7.3 near North Island New Zealand and the 8.1 in the Kermadec Islands on March 3, 2021 with M 4.3 and 3.9. Forecasts 133319 and 133614 had expected this activity was likely in the Unimak Islands within about 50 km of this epicenter in late April or early May. 

 

O: 03MAY2021 00:28:53  54.2N  161.3W mb=3.8  EMSC   ALASKA PENINSULA

O:  3MAY2021 00:16:47  54.2N  161.3W mb=3.4  EMSC   ALASKA PENINSULA             

P:  2MAY2021 133614    54.1N  164.4W 3.5-5.1 AABAA  Unimak Islands, Aleutians  

P: 24APR2021 133319    54.7N  161.2W 3.5-5.1 CAAAA  Unimak Islands, Aleutians  

 

An unusual earthquake of M 2.9 occurred in southeastern Brazil near Minas Gerais today where it was lightly felt. This is the first earthquake within about 500 km of this epicenter reported by NEIC since an M 4.2 on May 19, 2012 and prior to that an M 4.1 on May 22, 1990 about 400 km to the northwest of today's epicenter.

 

O:  2MAY2021 13:53:34  19.7S   44.0W ML=2.9  EMSC   MINAS GERAIS, BRAZIL         

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:  2MAY2021 11:19:04  24.0N   65.0E mb=4.4  EMSC   OFF COAST OF PAKISTAN        

P:  7MAY2021 133474    24.0N   70.0E 3.5-5.0 BACAA  India                      

 

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

 

INDONESIA AND PHILIPPINES

 

O:  2MAY2021 09:08:14   1.6S  120.1E ML=4.8  EMSC   SULAWESI, INDONESIA          

P:  4MAY2021 133398     0.0N  120.0E 4.0-5.7 ABAAA  Celebes Sea                

 

O:  2MAY2021 17:46:41   2.3S   99.8E Mw=5.6  EMSC   KEP. MENTAWAI REGION, INDONESI

P:  4MAY2021 133431     2.0S   99.0E 4.0-5.4 AAAAA  So. of Sumatera            

 

O:  2MAY2021 13:04:57   2.6S  127.2E ML=4.0  EMSC   CERAM SEA, INDONESIA         

P:  4MAY2021 133417     3.0S  126.0E 4.0-5.4 AAAAA  Ceram area                 

 

O:  2MAY2021 23:24:40   3.3S  130.5E mb=4.9  EMSC   SERAM, INDONESIA             

P:  1MAY2021 133417     4.0S  128.0E 4.0-5.4 AABAA  Ceram area                 

 

O:  2MAY2021 15:33:58   3.6S  119.7E ML=4.0  EMSC   SULAWESI, INDONESIA          

P:  5MAY2021 133433     1.0S  122.0E 4.0-5.5 BCBAA  Sulawesi area              

 

O:  2MAY2021 20:49:42   5.4N   94.7E mb=5.0  EMSC   NORTHERN SUMATRA, INDONESIA  

P:  3MAY2021 133411     6.0N   93.0E 4.0-5.5 AABAA  Nicobar Islands            

 

O:  2MAY2021 19:26:03   5.6S  145.5E mb=4.3  EMSC   EASTERN NEW GUINEA REG., P.N.G

P: 27APR2021 133126     5.0S  146.0E 4.0-5.4 BAAAA  New Ireland                

 

O:  2MAY2021 12:07:31   6.1S  103.3E mb=4.9  EMSC   SOUTHWEST OF SUMATRA, INDONESI

P:  2MAY2021 133431     5.0S  103.0E 4.0-5.6 ABAAA  So. of Sumatera            

 

O:  2MAY2021 15:02:02   6.5S  129.9E mb=4.6  EMSC   BANDA SEA                    

P:  5MAY2021 133438     7.0S  130.0E 4.0-5.4 BAAAA  West Irian, PNG            

 

O:  2MAY2021 09:33:53   6.6S  147.5E mb=4.6  EMSC   EASTERN NEW GUINEA REG., P.N.G

P: 27APR2021 133126     5.0S  148.0E 4.0-5.6 BBAAA  New Ireland                

 

O:  2MAY2021 22:17:59   9.9S  113.8E ML=4.1  EMSC   SOUTH OF JAVA, INDONESIA     

P: 30APR2021 133131     9.0S  114.0E 4.0-5.6 AAAAA  So. of Bali                

 

O:  2MAY2021 23:01:21  17.9N  147.1E mb=5.0  EMSC   MARIANA ISLANDS REGION       

P: 29APR2021 133161    17.0N  147.0E 4.0-5.4 BAAAA  No. Marianas               

 

O:  3MAY2021 05:26:46  21.7N  143.0E mb=4.2  EMSC   MARIANA ISLANDS REGION       

P:  3MAY2021 133486    22.0N  145.0E 4.0-5.7 AABAA  Volcano Islands            

 

CENTRAL AND SOUTH AMERICA

 

O:  3MAY2021 06:58:35  16.1N   98.4W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO      

P:  1MAY2021 133461    17.0N   98.0W 3.5-5.2 AAAAA  Oaxaca, Mexico             

 

O:  3MAY2021 06:04:33  17.6N  103.2W ML=4.2  EMSC   OFFSHORE MICHOACAN, MEXICO   

P:  3MAY2021 133454    18.0N  102.0W 3.5-5.5 AAAAA  Michoacan, Mexico          

 

O:  2MAY2021 13:53:34  19.7S   44.0W ML=2.9  EMSC   MINAS GERAIS, BRAZIL         

 

O:  2MAY2021 11:37:39  30.1S   71.4W Mw=4.6  EMSC   OFFSHORE COQUIMBO, CHILE     

O:  2MAY2021 11:37     30.2S   71.5W mb=4.6  GUC    Coquimbo at La Higuera, III in

P:  2MAY2021 133688    30.0S   70.0W 4.0-5.6 AAAAA  Coast Central Chile        

 

GUC reported this earthquakes was felt with intensity  VI in  Coquimbo at La Higuera, III in Andacollo, Coquimbo, La Serena and Monte Patria, Chile.

NEIC reported this earthquake of M 4.3 in Coquimbo, Chile was felt with intensity II-III in the area(s) of Coquimbo, Chile at La Serena.

 

 

O:  2MAY2021 09:55:12  27.9N  112.0W ML=3.3  EMSC   GULF OF CALIFORNIA           

P: 30APR2021 133175    28.0N  112.0W 3.5-5.0 AAAAA  Gulf of California         

 

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

 

AFRICA AND EUROPE

 

O:  2MAY2021 09:16:21  36.6N   23.0E mb=4.2  EMSC   SOUTHERN GREECE              

P:  3MAY2021 133519    37.0N   21.0E 3.0-4.8 AABAA  No. Greece                 

P: 29APR2021 133190    35.0N   24.0E 3.0-4.7 BBAAA  Aegean Sea                 

 

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

 

SOUTHWEST PACIFIC

 

O:  2MAY2021 09:15:11  10.6S  166.0E mb=4.8  EMSC   SANTA CRUZ ISLANDS           

O:  2MAY2021 17:15:10  13.2S  167.2E mb=4.7  EMSC   VANUATU                      

P:  5MAY2021 133649    12.0S  167.0E 4.0-5.8 BBAAA  Vanuatu Islands            

 

O:  3MAY2021 04:42:31  18.0S  178.5W mb=4.4  EMSC   FIJI REGION                  

P:  3MAY2021 133646    17.0S  177.0W 4.0-5.7 AABAA  Tonga Islands              

 

O:  2MAY2021 10:13:15  20.6S  177.7W mb=4.4  EMSC   FIJI REGION                  

P: 28APR2021 133369    21.0S  177.0W 4.0-5.7 BAAAA  Tonga Islands              

 

O:  3MAY2021 03:54:32  18.3S  173.2W mb=5.1  EMSC   TONGA                        

P:  4MAY2021 133672    20.0S  174.0W 4.0-5.5 ABAAA  Tonga Islands              

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

 

O:  2MAY2021 21:05:16  30.7S  177.2W mb=4.6  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  5MAY2021 133692    30.0S  177.0W 4.0-5.4 BAAAA  No. Kermadec Islands       

 

O:  2MAY2021 10:15:29  32.2S  179.1E ML=3.8  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  5MAY2021 133700    32.0S  178.0W 4.0-5.5 BABAA  So. Kermadec Islands       

 

O:  2MAY2021 06:59:14  36.8S  177.5E ML=3.7  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  3MAY2021 133695    38.0S  178.0E 3.0-4.6 ABAAA  North Island, N.Z.         

 

O: 03MAY2021 05:28:11  37.4S  179.8E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O: 02MAY2021 17:30:00  37.5S  179.9E ML=4.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O:  2MAY2021 18:51:20  37.5S  180.0W ML=3.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O:  2MAY2021 22:10:28  37.6S  179.9E ML=3.7  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  4MAY2021 133691    37.0S  180.0E 3.5-5.1 AAAAA  E. of North Islands N.Z.   

 

JAPAN AND KURIL ISLANDS

 

O:  3MAY2021 05:07:29  25.8N  123.9E Mw=5.5  EMSC   NORTHEAST OF TAIWAN          

O:  3MAY2021 06:07:31  25.5N  123.9E ML=6.4  TAI    Hualien, Taiwan              

P:  3MAY2021 133485    24.0N  124.0E 4.0-5.5 ABAAA  Taiwan                      

 

O:  3MAY2021 05:29:30  38.2N  141.7E ML=3.8  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  3MAY2021 133525    38.0N  141.0E 4.0-6.6 AAAAA  Off East Coast Honshu      

 

O:  2MAY2021 23:00:30  42.7N  143.1E ML=4.0  EMSC   HOKKAIDO, JAPAN REGION       

P: 28APR2021 133263    43.0N  145.0E 3.5-5.6 BABAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O:  2MAY2021 19:55:23  31.7N  115.9W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO      

P:  4MAY2021 133530    32.1N  116.4W 2.5-4.4 AAAAA  So. California             

 

O:  2MAY2021 16:25:42  33.0N  115.5W Ml=2.5  EMSC   SOUTHERN CALIFORNIA          

P:  2MAY2021 133530    32.4N  115.8W 2.5-4.4 AAAAA  So. California             

 

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

 

O:  2MAY2021 22:31:19  36.7N  120.9W Md=2.2  EMSC   CENTRAL CALIFORNIA           

P:  2MAY2021 133499    36.7N  121.4W 2.5-4.5 AAAAA  Central California         

 

O:  2MAY2021 20:51:29  37.8N  122.0W Md=2.2  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P:  4MAY2021 133500    38.0N  122.3W 2.5-4.8 AAAAA  Central California         

 

O:  3MAY2021 01:58:32  38.2N  117.7W ml=2.4  EMSC   NEVADA                       

P:  4MAY2021 133495    38.0N  118.8W 2.5-4.6 AAAAA  California/Nevada area     

 

O:  3MAY2021 01:38:51  38.8N  122.8W Md=2.2  EMSC   NORTHERN CALIFORNIA          

O: 03MAY2021 06:35:52  38.8N  122.8W Md=2.3  EMSC   NORTHERN CALIFORNIA

P:  4MAY2021 133501    38.9N  122.8W 2.5-4.6 AAAAA  Central California         

 

 

ALASKA

 

O: 03MAY2021 00:28:53  54.2N  161.3W mb=3.8  EMSC   ALASKA PENINSULA

O:  3MAY2021 00:16:47  54.2N  161.3W mb=3.4  EMSC   ALASKA PENINSULA             

P:  2MAY2021 133614    54.1N  164.4W 3.5-5.1 AABAA  Unimak Islands, Aleutians  

 

O:  2MAY2021 20:00:43  61.8N  149.8W ML=3.1  EMSC   SOUTHERN ALASKA              

P:  6MAY2021 133622    62.8N  149.1W 3.2-4.9 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:  2MAY2021 22:10:44  42.0N  111.9W ML=2.4  EMSC   SOUTHERN IDAHO               

P: 27APR2021 133298    43.0N  111.5W 2.0-4.1 BAAAA  Yellowstone/Wyoming         

 

EASTERN U.S./CANADA

 

O: 03MAY2021 00:07:47  34.8N   97.7W ML=2.1  EMSC   OKLAHOMA

O: 03MAY2021 00:45:13  34.8N   97.7W ML=2.6  EMSC   OKLAHOMA

O:  2MAY2021 11:49:22  34.7N   97.7W ML=2.1  EMSC   OKLAHOMA                     

P:  2MAY2021 133545    34.0N   97.0W 2.0-4.0 AAAAA  Southern Plains            

 

O:  2MAY2021 11:18:01  36.3N   97.5W mb=2.2  EMSC   OKLAHOMA                     

P: 30APR2021 133246    36.0N   97.0W 2.0-4.4 AAAAA  Southern Plains            

 

HAWAII

 

O:  2MAY2021 08:01:27  19.3N  155.4W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII     

P:  4MAY2021 133448    18.8N  155.2W 3.0-4.4 AAAAA  Hawaii                     

 

MODERATELY STRONG QUAKE SHAKES COQUIMBO, CHILE

 

EARTHQUAKE SUMMARY FOR  MAY 1, 2021      

 

The strongest earthquake in the world today was an M 5.8 in the region of Coquimbo, Chile. NEIC reported maximum intensity VI in Coquimbo and V in La Serena and Ovalle with light shaking in Valparaiso, Copiapo, Atacama, Lampa, Puente Alto, Santiago, Chile. GUC reported this earthquake was felt with intensity  VI in  Coquimbo at Vicuna, Combarbalo, V at Andacollo, Coquimbo, Paiguano, IV in Canela, Monte Patria, Ovalle, Punitaqui, Rio Hurtado, Salamanca, III in Illapel; IV in Santiaog at Puente Alto, II in Lo Barnechea; in Valparaiso with II in Quillota, Atacama with IV in Alto del Carmen and Vallenar and III in Caldera, Copiapo, Freirina, HJuasco and Tierra Amarilla, Chile. This is the strongest earthquake within about 200 km of this epicenter in Coquimbo, Chile since an M 5.8 on October 28, 2020 and an M 6.3 on September 6, 2020, the first such events in the region since an M 6.4 on June 14, 2019. A great M 8.3 earthquake hit about 150 km south of today's epicenter on September 16, 2015 doing much regional damage. An M 5.7 hit about 800 km southeast of this in Nuquen Argentina on April 29, 2021 and may have helped promote today's event. Forecasts 133377 and 133688 had expected today's activity in Coquimbo was like in late April or early May. This epicenter is at the seventh node (51-52 degrees) from the M 6.6 in the South Atlantic of April 3, 2021 and was probably promoted by energy from that event.

 

O:  2MAY2021 06:57     30.1S   71.6W mb=5.8  GUC    Coquimbo at Vicuna, Combarbalo

O:  2MAY2021 06:57:36  30.0S   71.5W Mw=5.8  EMSC   OFFSHORE COQUIMBO, CHILE     

P:  2MAY2021 133688    30.0S   70.0W 4.0-5.6 AAAAA  Coast Central Chile        

P: 25APR2021 133377    30.0S   70.0W 4.0-5.6 CAAAA  Coast Central Chile        

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in Southeastern Alaska. NEIC reported this earthquake was felt with maximum intensity V in Alaska at Skagway, and II-III in Gustavus, Elfin Cove, Hoonan, Haines, Yakutat, Douglas, Juneau. A foreshock of M 3.6 was felt with intensity III in Douglas, Alaska.  This is the strongest earthquake in Southeastern Alaska within about 200 km of this epicenter since an M 5.2 on December 18m 2019 and prior to that an M 5.7 on September 10, 2019. A regional foreshock occurred at this epicenter with M 2.6 following the M 4.8 near Anchorage, Alaska on April 28 suggesting stress buildup in the area. This event had been noted in this summary at the time. Forecasts 133598 and 133318 had expected today's activity was likely within about 25 km of today's epicenter in late April or early May. Activity in the area had been noted on April 26 as:

 

"A glacial surge has been occurring in southeastern Alaska. It was accompanied today by an M 2.6 Ice quake, one of the strongest in recent history. The surge is happening in Denali Park in Muldrow glacier and on April 12 reached speeds up to 100 feet per day, about 100 times as fast as normal." (April 26, 2021)

 

This activity is at the fourth node (90 degrees) from the M 8.1 in the Kermadec Islands of March 5, 2021 and was probably promoted by energy from that source. It is also near the seventh node (52 degrees) from the M 6.9 off eastern Honshu, Japan which occurred on May 1 and was probably promoted by energy from that source.

 

O: 28APR2021 04:44:39  58.5N  136.8W ML=2.6  EMSC   SOUTHEASTERN ALASKA          

P: 26APR2021 133318    58.0N  139.0W 3.0-4.8 AABAA  Southeast Alaska           

 

Today's activity is at 103 degrees from the M 7.3 off the North coast of North Island, New Zealand of March 4, 2021 and at the fourth node (90 degrees) from the Loyalty Islands M 6.6 of February 10, 2021 and was probably promoted by strong energy from those sources. Similar activity at this distance from New Zealand today occurred with an M 3.9 in Nicaragua.

 

O: 01MAY2021 13:53:03  58.2N  137.9W ML=3.6  EMSC   SOUTHEASTERN ALASKA

O: 01MAY2021 15:23:22  58.4N  138.1W mb=4.5  EMSC   SOUTHEASTERN ALASKA

O: 01MAY2021 15:23:20  58.3N  137.9W mb=4.7  ANSS   SOUTHEASTERN ALASKA

O: 01MAY2021 15:23:26  58.5N  136.8W MB=4.9  ECAN OF SKAGWAY, AK   

O: 01MAY2021 15:23:21  58.3N  137.9W MB=4.9  ECAN Yakutat, AK    

O:  1MAY2021 16:40:27  58.1N  138.0W ML=3.0  EMSC   SOUTHEASTERN ALASKA          

P: 26APR2021 133318    58.0N  139.0W 3.0-4.8 BAAAA  Southeast Alaska           

P:  3MAY2021 133598    58.3N  138.5W 3.0-4.9 AAAAA  British Colombia           

 

A moderate earthquake of M 4.3 also occurred off the coast of northern California today. This joins the regional activation which in the past two days has included event of M 5.4 off the coast of Oregon and the M 4.7-4.9 in southeastern Alaska today (see above). Today's event off western California was not reported felt but is somewhat unusual. An event of M 4.3 or greater last occurred within about 75 km of this epicenter  on January 27, 2021 with M 4.6 while a series including an M 5.5 occurred in mid May, 2020 and early May 2019 which included an M 4.8. Forecast 133281 had expected today's event was likely around April 30.

 

O:  2MAY2021 03:30:52  41.1N  127.4W mb=4.3  EMSC   OFF COAST OF NORTHERN CALIFORN

P: 30APR2021 133281    41.8N  126.9W 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

 

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

 

INDONESIA AND PHILIPPINES

 

O:  2MAY2021 06:49:29   0.4N   98.6E ML=4.3  EMSC   NIAS REGION, INDONESIA       

P: 23APR2021 133112     0.0N   99.0E 4.0-5.5 CAAAA  So. Sumatera               

P: 29APR2021 133112     2.0N   99.0E 4.0-5.6 BBAAA  So. Sumatera               

 

O:  1MAY2021 09:22:00   1.6S  120.2E mb=4.6  EMSC   SULAWESI, INDONESIA          

P: 27APR2021 133137     1.0S  122.0E 4.0-5.5 BABAA  Sulawesi area              

 

O:  1MAY2021 13:12:07   1.7N  127.2E ML=4.3  EMSC   HALMAHERA, INDONESIA         

P:  1MAY2021 133409     1.0N  126.0E 4.0-5.6 AAAAA  Mindanao, Philippines      

 

O:  1MAY2021 11:41:34   2.6S  128.8E ML=4.3  EMSC   CERAM SEA, INDONESIA         

P:  1MAY2021 133417     4.0S  128.0E 4.0-5.4 ABAAA  Ceram area                 

P: 27APR2021 133118     4.0S  128.0E 4.0-5.4 BBAAA  Ceram area                 

 

O:  1MAY2021 15:39:15   3.1S  148.5E mb=4.7  EMSC   BISMARCK SEA                 

P:  1MAY2021 133424     3.0S  149.0E 4.0-5.8 AAAAA  New Ireland                

P: 27APR2021 133126     5.0S  148.0E 4.0-5.6 BBAAA  New Ireland                

 

O: 01MAY2021 13:47:22   6.1N  126.1E ML=4.2  EMSC   MINDANAO, PHILIPPINES

O:  1MAY2021 14:26:44   5.0N  125.5E mb=5.1  EMSC   MINDANAO, PHILIPPINES        

P:  2MAY2021 133410     5.0N  126.0E 4.0-5.6 AAAAA  Mindanao, Philippines      

P: 28APR2021 133110     5.0N  125.0E 4.0-5.6 BAAAA  Mindanao, Philippines      

 

NEIC reported this earthquake of M 5.1 in Indonesia was felt with intensity II-III in the area(s) of Mindanao, Philippines at San Jose.

 

O:  1MAY2021 14:34:08   6.4S  130.2E ML=4.0  EMSC   BANDA SEA                    

P:  2MAY2021 133438     6.0S  131.0E 4.0-5.5 AAAAA  West Irian, PNG            

P: 28APR2021 133142     6.0S  131.0E 4.0-5.6 BAAAA  West Irian, PNG            

 

O:  2MAY2021 06:36:04   8.9S  119.2E mb=4.6  EMSC   FLORES REGION, INDONESIA     

P: 29APR2021 133121     8.0S  121.0E 4.0-5.5 BABAA  Flores Island area         

 

O:  2MAY2021 05:45:49  10.2N  126.5E ML=4.0  EMSC   PHILIPPINE ISLANDS REGION    

P:  4MAY2021 133451    11.0N  126.0E 3.5-4.9 AAAAA  Luzon, Philippines         

 

 

CENTRAL AND SOUTH AMERICA

 

O:  1MAY2021 09:17:01  11.4N   85.4W ML=3.9  EMSC   NICARAGUA                    

P: 28APR2021 133159    11.0N   86.0W 3.5-5.5 BAAAA  Nicaragua                  

 

O:  1MAY2021 16:28:43  13.0S   76.6W ML=4.0  EMSC   NEAR COAST OF CENTRAL PERU   

P: 29APR2021 133340    13.0S   77.0W 4.0-5.5 AAAAA  Central Peru               

 

O: 02MAY2021 05:54:19  14.0N   91.8W mb=4.6  EMSC   OFFSHORE GUATEMALA

O:  2MAY2021 04:31:33  14.0N   91.8W mb=4.2  EMSC   OFFSHORE GUATEMALA           

P: 30APR2021 133150    13.0N   91.0W 3.5-5.6 AAAAA  Guatemala                  

 

O:  1MAY2021 21:57:37  14.5N   93.5W ML=4.2  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 29APR2021 133146    14.0N   93.0W 3.5-5.2 AAAAA  Chiapas, Mexico            

 

O:  1MAY2021 08:26:09  16.0N   98.9W ML=4.0  EMSC   OFFSHORE GUERRERO, MEXICO    

P:  1MAY2021 133461    17.0N   98.0W 3.5-5.2 AAAAA  Oaxaca, Mexico             

 

O:  2MAY2021 01:46:51  19.3N   68.9W ML=3.6  EMSC   DOMINICAN REPUBLIC REGION    

P: 29APR2021 133167    18.0N   68.0W 3.4-5.4 BBAAA  Puerto Rico                

 

O:  2MAY2021 06:47:24  19.4N   64.6W Md=4.0  EMSC   VIRGIN ISLANDS REGION        

P: 30APR2021 133152    19.0N   65.0W 3.0-5.0 AAAAA  Leeward Islands            

 

NEIC reported this earthquake of M 4.0 in the Virgin Islands  was felt with intensity II-III in the area(s) of Dorado, Puerto Rico.

 

O:  1MAY2021 17:44:33  28.4N  115.3W ML=3.8  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 26APR2021 133226    30.2N  114.1W 2.0-4.3 BBAAA  SW U.S.A                   

 

O:  2MAY2021 06:57:36  30.0S   71.5W Mw=5.8  EMSC   OFFSHORE COQUIMBO, CHILE     

P:  2MAY2021 133688    30.0S   70.0W 4.0-5.6 AAAAA  Coast Central Chile        

P: 25APR2021 133377    30.0S   70.0W 4.0-5.6 CAAAA  Coast Central Chile        

 

 

 

AFRICA AND EUROPE

 

O:  1MAY2021 09:43:21  34.8N   23.3E mb=4.4  EMSC   CRETE, GREECE                

P: 29APR2021 133190    35.0N   24.0E 3.0-4.7 AAAAA  Aegean Sea                 

 

O:  2MAY2021 06:24:02  39.2N    0.6W ML=3.4  EMSC   SPAIN                        

P:  4MAY2021 133515    37.0N    3.0W 3.5-5.2 ACBAA  Morocco/Spain              

 

O:  1MAY2021 22:10:06  35.4N    3.7W mb=4.3  EMSC   STRAIT OF GIBRALTAR          

P: 29APR2021 133216    37.0N    3.0W 3.5-5.0 ABAAA  Morocco/Spain              

 

NEIC reported this earthquake of M 4.3 in the Strait of Gibraltar was felt with intensity II-III in the area(s) of Al Hocima and Imzouren, Morocco and in Melilla, Spain.

 

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

 

SOUTHWEST PACIFIC

 

O:  1MAY2021 11:50:27  16.2S  167.9E Mw=5.3  EMSC   VANUATU                      

P: 27APR2021 133356    17.0S  168.0E 4.0-5.4 BAAAA  Vanuatu Islands            

 

O:  1MAY2021 13:46:52  22.3S  179.8W mb=4.4  EMSC   SOUTH OF FIJI ISLANDS        

O: 01MAY2021 17:57:09  23.6S  179.7W mb=4.1  EMSC   SOUTH OF FIJI ISLANDS

P: 28APR2021 133369    21.0S  179.0W 4.0-5.5 BBAAA  Tonga Islands              

 

OCEAN RIDGES

 

O:  1MAY2021 07:08:51  59.9S   24.2W mb=4.6  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  4MAY2021 133712    59.0S   26.0W 4.0-5.9 BAAAA  So. Sandwich Islands       

P: 30APR2021 133396    61.0S   22.0W 4.0-5.6 ABAAA  Southern  Ocean            

 

O:  1MAY2021 11:17:59  62.2S   58.5W mb=4.3  EMSC   SOUTH SHETLAND ISLANDS       

P:  4MAY2021 133714    61.0S   58.0W 4.0-5.8 BBAAA  Southern  Ocean            

P: 23APR2021 133395    62.0S   58.0W 3.0-5.4 CAAAA  So. So. America            

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 02MAY2021 05:35:24  35.5S  179.6E ML=3.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O: 01MAY2021 20:21:04  35.7S  178.9E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

O:  2MAY2021 06:59:14  36.8S  177.5E ML=3.7  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O:  2MAY2021 00:07:07  35.5S  178.6E mb=5.2  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  4MAY2021 133691    37.0S  180.0E 3.5-5.1 ABAAA  E. of North Islands N.Z.   

 

O:  1MAY2021 16:42:22  49.8S  164.0E ML=4.5  EMSC   AUCKLAND ISLANDS, N.Z. REGION

P: 28APR2021 133389    46.0S  167.0E 3.0-5.0 BCBAA  Southern S. Isl. N.Z.      

 

JAPAN AND KURIL ISLANDS

 

O:  1MAY2021 13:06:30  38.2N  141.7E ML=3.5  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  3MAY2021 133525    38.0N  141.0E 4.0-6.6 AAAAA  Off East Coast Honshu      

P: 28APR2021 133224    39.0N  142.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

O:  1MAY2021 15:59:28  45.8N  152.1E mb=4.3  EMSC   EAST OF KURIL ISLANDS        

P: 28APR2021 133290    45.0N  149.0E 3.5-5.6 BABAA  So. Kurils                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O:  1MAY2021 16:07:12  35.5N  118.4W Ml=2.2  EMSC   CENTRAL CALIFORNIA           

P:  3MAY2021 133487    35.3N  118.6W 2.5-2.7 AAAAA  So. California             

P: 28APR2021 133239    35.7N  118.1W 2.5-5.1 BAAAA  So. California             

 

O:  1MAY2021 08:04:26  36.4N  121.0W Md=2.3  EMSC   CENTRAL CALIFORNIA           

P: 29APR2021 133200    36.4N  121.0W 2.5-4.4 AAAAA  Central California         

 

O:  1MAY2021 18:26:24  39.8N  121.8W Ml=3.0  EMSC   NORTHERN CALIFORNIA          

P:  3MAY2021 133575    40.2N  121.2W 2.5-4.4 AAAAA  Northern California        

P: 29APR2021 133278    40.0N  120.9W 2.5-4.5 AAAAA  Northern California        

 

NEIC reported this earthquake of M 3.0 in Northern California was felt with intensity II-III in the area(s) of Northern California at Chico, Yuba City, Arbuckle and Lincoln.

 

O:  2MAY2021 06:30:07  40.7N  124.7W Md=2.4  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 30APR2021 133279    40.2N  124.2W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

O:  2MAY2021 03:30:52  41.1N  127.4W mb=4.3  EMSC   OFF COAST OF NORTHERN CALIFORN

P: 30APR2021 133281    41.8N  126.9W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

ALASKA

 

O: 01MAY2021 13:53:03  58.2N  137.9W ML=3.6  EMSC   SOUTHEASTERN ALASKA

O: 01MAY2021 15:23:22  58.4N  138.1W mb=4.5  EMSC   SOUTHEASTERN ALASKA

O: 01MAY2021 15:23:26  58.5N  136.8W MB=4.9  ECAN OF SKAGWAY, AK   

O: 01MAY2021 15:23:21  58.3N  137.9W MB=4.9  ECAN Yakutat, AK    

O:  1MAY2021 16:40:27  58.1N  138.0W ML=3.0  EMSC   SOUTHEASTERN ALASKA          

P:  3MAY2021 133598    58.3N  138.5W 3.0-4.9 AAAAA  British Colombia           

 

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

 

No earthquakes of M>=2 were located in the Rocky Mountain region today.

 

EASTERN U.S./CANADA

 

No earthquakes of M>=1 were located in the Eastern U.S. or Canada today.

 

HAWAII

 

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

 

STRONG QUAKE SHAKES EASTERN HONSHU, JAPAN

 

EARTHQUAKE SUMMARY FOR  APRIL 30, 2021

 

The strongest earthquake in the world today was an M 6.8 off the northern coast of Eastern Honshu, Japan. NEIC reported intensity VII in Japan in Miyagi, Prefecture in Yamoto, Tagajo, Kogota, and VI in Natori, Sendai, Kesennauma and Ishinomaki and V in Shiogama, Rifu and Iwanuma. JMA reported this earthquake with M 6.6 and noted intensity 5+ in Miyagi with intensity up to 4 throughout most of western Honshu. It was preceded by an M 4.5 to the northwest which was felt with intensity II-III in Tomisato, Oamishirasato, Chiba and in Kanagawa, Japan. No tsunami was expected with this earthquake nor were significant tsunami waves observed. Trains and some company operations were suspended following the quake but operations returned after checks revealed no major damage. While some light injuries were reported no major casualties occurred. The mainshock occurred near local solar noon and was probably promoted by strong tidal stresses related to the Full Moon of April 27 as noted in previous issues of this summary:

 

"The full moon arrived on April 27, 2021 at 03:31 UT. Longitudes which were sub-solar (local solar noon) at this time were near 130 East Longitude while those near local solar midnight area near 50 West longitude. Those in the west include the Atlantic Ocean as far as the eastern Caribbean and the Shetland and South Sandwich Islands and in the east in western Japan, Taiwan, the Philippines and Central Indonesia. These areas may see enhanced seismicity within about 3 days of the full moon." (April 27, 2021)

 

Today's event follows similar earthquakes off eastern Honshu of M 7.0 on March 20, 2021 and M 7.1 on February 13, 2021 - an event closely linked to the new moon of February 11, 2021. The last such earthquake of M>=6.8 off the coast of eastern Honshu occurred as an M 6.9 on November 32, 2016. These all appear to be aftershocks of the great M 9.3 of March 11, 2011. Far-field seismicity  may be promoted by this event as noted following previous large earthquakes in this area:

 

"Far-field triggering is possible from the M 7.1 in Japan today. Areas at 144 degrees include the South Shetland Islands, northern Chile and southern Peru; near 103 degrees in central and western Mexico, the Madeira Islands, southern Spain, Madagascar, Mayotte, at 120 degrees (node 3) at Panama and Costa Rica and Puerto Rico; at 90 degrees (node 4) at Oklahoma and Texas, South Island, New Zealand; at 72 degrees (node 5) in Central and northern California, Iceland, Croatia, eastern Europe and Turkey, Fiji, Tonga, Loyalty Islands; in  western Indonesia at 60 degrees (node 6); in Tajikistan, Indonesia, Philippines  at node 7 (51 degrees) and in New Britain, Xizang, Alaska Peninsula at node 8 (45 degrees)." (February 14, 2021)

 

Forecast 133224 had expected this activity in Japan was likely within about 100 km around April 28.

 

O: 01MAY2021 03:01:30  38.3N  141.9E ML=3.6  EMSC   NEAR EAST COAST OF HONSHU, JAPAN

O: 01MAY2021 06:58:30  38.2N  141.7E ML=3.8  EMSC   NEAR EAST COAST OF HONSHU, JAPAN

O:  1MAY2021 01:27:28  38.2N  141.7E Mw=6.8  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 28APR2021 133224    39.0N  142.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

O:  1MAY2021 00:10:06  39.4N  140.6E mb=4.5  EMSC   EASTERN HONSHU, JAPAN        

P: 28APR2021 133224    39.0N  142.0E 4.0-5.4 BABAA  Off East Coast Honshu      

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in the area of Central Alaska. NEIC reported this earthquake of M  4.3 in Central Alaska was felt with intensity II-III in the area(s) of Central Alaska at Fairbanks.  This is the strongest earthquake within about 200 km of this epicenter since an M 4.3 on August 4, 2020. The last event of larger magnitude in this area was an M 4.6 on September 6, 2019. Forecast 133326 had expected today's event in Central Alaska was likely around April 28. 

 

O: 30APR2021 17:19:24  64.8N  152.4W mb=4.3  EMSC   CENTRAL ALASKA               

P: 28APR2021 133326    62.8N  151.2W 3.2-5.1 ABAAA  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: 30APR2021 20:47:32  19.3N   97.1E mb=4.5  EMSC   MYANMAR                      

P: 28APR2021 133180    23.0N   94.0E 4.0-5.4 ACCAA  Myanmar                    

 

NEIC reported this earthquake of M 4.4 in Myanmar was felt with intensity II-III in the area(s) of Myanmar at Pyinmana, Mandalay.

 

O: 30APR2021 14:21:06  37.8N   69.3E mb=4.1  EMSC   TAJIKISTAN                   

O:  1MAY2021 02:52:42  39.2N   72.6E mb=4.2  EMSC   TAJIKISTAN                   

P: 24APR2021 133210    39.0N   71.0E 3.8-5.2 CAAAA  Hindu Kush/Pakistan         

P: 27APR2021 133210    38.0N   74.0E 3.8-5.6 BBAAA  Hindu Kush/Pakistan        

 

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

 

INDONESIA AND PHILIPPINES

 

O:  1MAY2021 01:47:28   1.4N   96.9E ML=4.3  EMSC   NIAS REGION, INDONESIA       

P: 27APR2021 133111     2.0N   95.0E 4.0-5.8 BABAA  Nicobar Islands            

P: 29APR2021 133112     2.0N   99.0E 4.0-5.6 AABAA  So. Sumatera               

 

O: 30APR2021 22:34:30   1.6S  120.2E ML=4.8  EMSC   SULAWESI, INDONESIA

O: 30APR2021 19:50:46   1.6S  120.1E ML=4.5  EMSC   SULAWESI, INDONESIA          

P: 24APR2021 133137     1.0S  120.0E 4.0-5.4 CAAAA  Sulawesi area              

 

O:  1MAY2021 00:21:58   2.6S  128.9E ML=4.5  EMSC   CERAM SEA, INDONESIA         

P: 27APR2021 133118     4.0S  128.0E 4.0-5.4 BBAAA  Ceram area                 

 

O: 30APR2021 16:30:59   4.2S  135.8E ML=4.0  EMSC   NEAR S COAST OF PAPUA, INDONES

P: 27APR2021 133140     3.0S  134.0E 4.0-5.6 BBBAA  West Irian, PNG            

 

O: 30APR2021 17:42:14   5.1N  127.3E ML=4.1  EMSC   PHILIPPINE ISLANDS REGION    

P: 27APR2021 133110     6.0N  126.0E 4.0-5.4 BABAA  Mindanao, Philippines      

 

O: 30APR2021 16:43:27   5.4N   94.3E mb=5.0  EMSC   NORTHERN SUMATRA, INDONESIA  

P: 27APR2021 133111     2.0N   95.0E 4.0-5.8 BCAAA  Nicobar Islands            

 

NEIC reported this earthquake of M 5.1 in northern Sumatra, Indonesia was felt with intensity II-III in the area(s) of northern Sumatra, Indonesia at Banda Aceh.

 

O: 30APR2021 20:25:23   7.5S  128.7E mb=4.4  EMSC   KEPULAUAN BARAT DAYA, INDONESI

P: 28APR2021 133114     7.0S  129.0E 4.0-5.5 AAAAA  Banda Sea                  

 

O:  1MAY2021 03:23:20  15.6N  145.3E mb=4.3  EMSC   SAIPAN REG., N. MARIANA ISLAND

P: 30APR2021 133168    14.0N  145.0E 4.0-5.4 ABAAA  So. Marianas/Guam          

 

CENTRAL AND SOUTH AMERICA

 

O:  1MAY2021 06:13:40   9.7N   79.1W Mw=5.1  EMSC   PANAMA                       

P: 27APR2021 133102     7.0N   78.0W 4.0-5.6 BCAAA  Colombia                   

P: 29APR2021 133145    10.0N   84.0W 3.5-5.2 AACAA  Caribbean Sea              

 

NEIC reported this earthquake of M 5.1 in Panama was felt with intensity II-III in the area(s) of Panama with VI in Cabra; IV in Los Lotes, Cerro Azul, Tecumen, Alcaisw, Las Cumbres, San Miguelito and Panama City and III in Chilibre, and  Tubuala Kuna.

 

O:  1MAY2021 06:36:35  11.9N   73.9W mb=4.5  EMSC   NEAR NORTH COAST OF COLOMBIA 

P: 23APR2021 133162    12.0N   71.0W 3.5-5.1 CABAA  Northern Venezuela         

P: 26APR2021 133162    10.0N   71.0W 3.5-5.1 BBBAA  Northern Venezuela         

 

NEIC reported this earthquake of M 4.5 off Northern Colombia  was felt with intensity II-III in the area(s) of Northern Columbia at Santa Maria and Barranquilla.

 

O:  1MAY2021 06:26:23  16.0N   98.9W ML=4.2  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 23APR2021 133165    17.0N   98.0W 3.5-5.1 CAAAA  Oaxaca, Mexico             

 

O: 30APR2021 09:09:41  17.3S   69.7W mb=4.1  EMSC   SOUTHERN PERU

O: 30APR2021 13:02:30  16.7S   72.8W ML=4.0  EMSC   NEAR COAST OF SOUTHERN PERU  

O: 30APR2021 10:02:36  17.3S   69.8W mb=4.4  EMSC   SOUTHERN PERU                

P: 28APR2021 133349    16.0S   72.0W 4.0-5.6 AAAAA  So. Peru/Bolivia           

 

O: 30APR2021 07:39:27  17.5N   94.9W ML=4.1  EMSC   VERACRUZ, MEXICO              

P: 29APR2021 133164    17.0N   96.0W 3.5-5.1 AAAAA  Oaxaca, Mexico             

 

O: 30APR2021 15:04:35  28.0N  112.2W ML=3.8  EMSC   GULF OF CALIFORNIA           

P: 30APR2021 133175    28.0N  112.0W 3.5-5.0 AAAAA  Gulf of California         

 

O: 30APR2021 20:06:36  29.0S   71.7W Mw=4.6  EMSC   OFFSHORE ATACAMA, CHILE      

P: 27APR2021 133359    28.0S   71.0W 4.0-5.6 BAAAA  Coast Central Chile        

 

O:  1MAY2021 02:21:38  19.1N   66.8W Md=3.0  EMSC   PUERTO RICO REGION           

P: 30APR2021 133152    19.0N   65.0W 3.0-5.0 AABAA  Leeward Islands            

 

 

AFRICA AND EUROPE

 

O: 30APR2021 20:04:52  71.5N    4.3W mb=4.1  EMSC   JAN MAYEN ISLAND REGION      

P: 29APR2021 133334    71.0N    8.0W 3.5-5.1 AAAAA  Jan Mayen Isl. area        

 

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: 30APR2021 21:49:38  40.8S   78.5E mb=5.1  EMSC   MID-INDIAN RIDGE             

P: 30APR2021 133382    37.0S   79.0E 4.0-5.5 ACAAA  So. Indian Ocean           

 

O: 30APR2021 21:35:31  48.9S   31.1E mb=4.8  EMSC   SOUTH OF AFRICA              

P: 29APR2021 133392    51.0S   29.0E 4.0-5.4 ABBAA  Atlantic-Indian Ridge      

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 30APR2021 09:50:44  37.2S  178.5E ML=3.7  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 25APR2021 133380    37.0S  178.0E 3.0-4.5 BAAAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

 

O: 30APR2021 17:45:41  33.8N  136.4E mb=4.3  EMSC   NEAR S. COAST OF WESTERN HONSH

P: 26APR2021 133219    35.0N  137.0E 3.5-5.1 BBAAA  No. Honshu, Japan          

 

O: 01MAY2021 03:01:30  38.3N  141.9E ML=3.6  EMSC   NEAR EAST COAST OF HONSHU, JAPAN

O: 01MAY2021 06:58:30  38.2N  141.7E ML=3.8  EMSC   NEAR EAST COAST OF HONSHU, JAPAN

O:  1MAY2021 01:27:28  38.2N  141.7E Mw=6.8  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 28APR2021 133224    39.0N  142.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

O:  1MAY2021 00:10:06  39.4N  140.6E mb=4.5  EMSC   EASTERN HONSHU, JAPAN        

P: 28APR2021 133224    39.0N  142.0E 4.0-5.4 BABAA  Off East Coast Honshu      

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 30APR2021 10:56:27  32.5N  115.6W Ml=2.4  EMSC   BAJA CALIFORNIA, MEXICO      

P: 29APR2021 133231    32.4N  115.8W 2.5-4.5 AAAAA  So. California             

 

O: 30APR2021 17:48:28  33.5N  116.7W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P: 25APR2021 133232    33.4N  116.7W 2.5-4.5 BAAAA  So. California              

 

O: 30APR2021 21:35:43  34.0N  117.0W ML=2.5  EMSC   GREATER LOS ANGELES AREA, CALI

P: 28APR2021 133233    33.7N  117.5W 2.5-4.6 AAAAA  So. California             

 

NEIC reported this earthquake of M 2.6 in Southern California was felt with intensity II-III in the area(s) of Southern California at Yucaipa, Redlands, Highland, San Bernardino, Riverside, Perris, and Hesperia.

 

O: 30APR2021 09:46:28  36.9N  121.4W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 30APR2021 23:41:32  36.2N  120.8W Md=2.1  EMSC   CENTRAL CALIFORNIA           

O: 30APR2021 23:53:56  36.6N  121.2W Md=2.5  EMSC   CENTRAL CALIFORNIA           

P: 29APR2021 133200    36.4N  121.0W 2.5-4.4 AAAAA  Central California         

 

O: 30APR2021 11:59:44  38.1N  118.4W ml=2.4  EMSC   NEVADA                       

O: 30APR2021 12:11:26  38.2N  117.8W ml=2.0  EMSC   NEVADA                       

P: 25APR2021 133195    38.0N  118.0W 2.5-4.7 BAAAA  California/Nevada area     

 

O: 30APR2021 14:59:35  38.8N  122.8W Md=2.8  EMSC   NORTHERN CALIFORNIA          

P: 29APR2021 133202    38.7N  122.7W 2.5-4.5 AAAAA  Central California         

 

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

 

O: 30APR2021 20:10:52  39.4N  118.1W ml=2.3  EMSC   NEVADA                       

P: 29APR2021 133258    40.0N  117.9W 2.5-4.6 AAAAA  California/Nevada area     

 

O: 30APR2021 06:59:36  39.4N  120.2W ml=2.2  EMSC   NORTHERN CALIFORNIA          

P: 26APR2021 133203    39.4N  120.5W 2.5-4.6 BAAAA  Central California         

 

 

ALASKA

 

O: 30APR2021 15:15:34  52.2N  176.2W mb=3.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 27APR2021 133304    51.7N  175.3W 3.5-5.2 BAAAA  Andreanoff Isls, Aleutians 

 

O: 30APR2021 13:01:16  55.4N  161.8W ML=3.0  EMSC   ALASKA PENINSULA

O: 30APR2021 19:47:18  54.3N  161.6W mb=3.4  EMSC   ALASKA PENINSULA             

P: 26APR2021 133319    54.1N  162.8W 3.5-5.1 BAAAA  Unimak Islands, Aleutians  

 

O: 30APR2021 17:19:24  64.8N  152.4W mb=4.3  EMSC   CENTRAL ALASKA               

P: 28APR2021 133326    62.8N  151.2W 3.2-5.1 ABAAA  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: 30APR2021 10:15:31  32.1N  102.1W mb=3.0  EMSC   WESTERN TEXAS                

P: 26APR2021 133227    32.6N  103.6W 2.0-3.9 BABAA  SW U.S.A                   

 

NEIC reported this earthquake of M 3.2 in Western Texas was felt with intensity II-III in the area(s) of Western Texas with IV in Midland, and lesser shaking in Stanton, Austin, Seabrook.

 

O: 30APR2021 13:20:01  44.3N  115.3W ML=2.6  EMSC   SOUTHERN IDAHO

O: 30APR2021 13:38:40  44.3N  115.2W Ml=2.3  EMSC   SOUTHERN IDAHO

O: 30APR2021 12:06:16  44.3N  115.2W Ml=2.3  EMSC   SOUTHERN IDAHO               

P: 28APR2021 133269    44.4N  115.2W 2.0-4.1 AAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 30APR2021 19:58:59  34.4N   97.5W ML=2.1  EMSC   OKLAHOMA                      

P: 28APR2021 133245    34.0N   96.0W 2.0-4.3 AAAAA  Southern Plains            

 

O: 30APR2021 13:16:32  36.9N   98.7W ML=2.0  EMSC   OKLAHOMA                     

P: 30APR2021 133246    36.0N   97.0W 2.0-4.4 AABAA  Southern Plains             

 

O: 30APR2021 12:50:03  39.6N   98.4W mb=2.3  EMSC   KANSAS                       

P: 26APR2021 133247    39.0N   99.0W 2.0-4.3 BAAAA  Southern Plains            

 

O: 30APR2021 13:35:08  48.5N   58.8W MB=2.2  ECAN Stephenville, NL               

 

O: 30APR2021 09:07:34  47.0N   71.0W MB=1.8  ECAN Beaupre, QC                    

P: 26APR2021 133274    47.3N   70.5W 2.0-3.9 BAAAA  New England                

 

O: 29APR2021 18:34:21  46.0N   64.9W MB=2.4  ECAN Salisbury, NB                  

P: 22APR2021 133261    46.0N   66.0W 2.0-3.9 CAAAA  E. of Maine                

 

O: 29APR2021 11:39:27  49.0N   67.6W MB=2.7  ECAN Matane, QC                     

P: 28APR2021 133261    49.0N   66.0W 2.0-3.9 AAAAA  E. of Maine                

 

HAWAII

 

O: 01MAY2021 05:30:25  19.3N  155.4W ML=2.9  EMSC   ISLAND OF HAWAII, HAWAII

O: 30APR2021 15:33:47  19.2N  155.6W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 28APR2021 133176    20.1N  156.1W 4.0-5.8 AAAAA  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 Naalehu. A foreshock of M 3.0 was also felt in Captain Cook and Volcano, Hawaii.

 

MODERATE QUAKES OFF COAST OF OREGON RELATED TO FULL MOON

 

EARTHQUAKE SUMMARY FOR  APRIL 29, 2021

 

The enhanced seismicity off the coast of Oregon of the past several days maximized today with an M 5.4 and M 5.2 in the region today. These events were felt with maximum intensity VI in Oregon at Gold Beach, and II-III in Bandon, Brookings, Portland, Seaside and Salem and in California at Fortuna and Burnt Ranch. In recent history the largest earthquakes in this area have occurred with the full moon alignment and were probably tidally promoted. In the previous issue of this summary it had been noted in this regard:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.4 off the coast of Oregon. This is the strongest earthquake within about 150 km of this epicenter since an M 5.1 and  an M 4.9 on February 20, 2021. A moderate quake of M 5.7 on December 29, 2020 was the only other such earthquake in the area in the past year. Forecast 133282 had expected today's event was likely around  April 29." (April 28-29, 2021)

 

Prior to the M 5.7 of December 29, 2020, the area had not seen an event of M>=5.4 since and M 5.9 on September 5, 2019, an aftershock of an M 6.3 on August 29, 2019.

 

Similar to today's event, the earthquake of December 29, 2020 occurred with the full moon of December 30, as noted  in this summary at the time:

 

"The strongest earthquake in the U.S. or Canada today was an M 5.7 off the Coast of Oregon. NEIC reported it was felt lightly along the coast in Bandon, Langlois, Port Orford, Coquille, Coos Bay, Gold Beach, Lakeside, North Bend, Florence, and Newport, Oregon. This event occurred near local solar midnight and may have been promoted by tidal triggering associated with the full moon on December 30 " (December 30, 2020)

 

and

 

"The third promoter of today's event off Oregon was probably high astronomical tides associated with the new moon." (August 30, 2019)

 

Previous events in the region including an M 6.2 on August 22, 2018; July 17, 2019 (M 5.4); August 16, 2019 (M 5.4). These events were also noted at the time to have been closely associated with the full moon as noted at the time in this summary:

 

"The strongest earthquake in the U.S. or Canada today was an M 5.4 off the coast of Oregon. NEIC reported it may have been felt lightly in Oregon at Eugene and Medford and in Seattle, Washington. A foreshock to the southeast of the M 5.4 occurred earlier in the day near local solar midnight and may have been promoted by strong tidal stresses associated with the full moon. The last event with M>=3.9 near the foreshock occurred a month ago on July 17, 2019 and prior to that as an M 4.1 on June 26, 2019. Both the event in June and July (2019) occurred with the full moon as noted at the time" (August 17, 2019)

 

Today's events of M 5.3, 5.4 and 5.2 occurred within about 25-50 km of the  epicenter expected in forecast 133282 which expected this activity was likely around April 29. This activity is at 142 degrees from the M 6.6 in the South Atlantic of April 3, 2021, the last strong global earthquake and at the fourth node (90 degrees) from the M 7.3 in the region of North Island, New Zealand of March 4, 2021 and may have been promoted by energy from those sources. Similar events at the fourth node from New Zealand occurred today in Guerrero, Mexico (M 5.0) and in California and the Gulf of California among others.

 

O: 29APR2021 13:24:55  43.8N  128.2W mb=4.1  EMSC   OFF COAST OF OREGON

O: 29APR2021 13:33:00  43.8N  128.4W mb=3.9  EMSC   OFF COAST OF OREGON

O: 29APR2021 10:30:21  43.9N  128.5W Mw=5.4  EMSC   OFF COAST OF OREGON

O: 29APR2021 10:35:45  43.9N  128.5W Mw=5.2  EMSC   OFF COAST OF OREGON

O: 29APR2021 10:58:35  43.9N  128.1W Mw=5.3  EMSC   OFF COAST OF OREGON

O: 29APR2021 10:25:16  44.0N  128.0W mb=4.3  EMSC   OFF COAST OF OREGON

O: 29APR2021 13:24:55  43.8N  128.2W mb=4.1  EMSC   OFF COAST OF OREGON          

P: 29APR2021 133282    44.1N  128.8W 3.0-4.7 AAAAA  Off Coast of Oregon        

 

The strongest seismicity in the world today continued to occur in the aftershock

zone of the Northern Kermadec Islands following the mainshock in that area of March 4, 2021. None of these events including an M 5.9 and two of M 5.5 were reported felt in this remote area. This continues elevated seismicity in this region as discussed in the previous issue of this summary:

 

 

"The strongest earthquake in the world that was not felt today was an M 5.9 in the continuing aftershock sequence in the northern Kermadec Islands, New Zealand. This followed an M 5.4 off northern North Island, New Zealand. The last earthquake in this aftershock zone in northern Kermadec Islands with M>=5.9 occurred on April 27, 2021 also with M 5.9. Earthquakes of M 6.0 on April 7 and M 6.5 on April 1 complete the list of similar earthquakes since the immediate aftershocks of the M 8.1 on March 4.  Forecasts 133362 had expected today's activity in the aftershock zone within about 50 km of this epicenter around April 26-30." (April 28-29, 2021) 

 

O: 29APR2021 13:55:31  29.2S  176.5W mb=5.0  EMSC   KERMADEC ISLANDS REGION

O: 29APR2021 06:50:30  29.4S  176.7W Mw=5.9  EMSC   KERMADEC ISLANDS REGION

O: 29APR2021 07:06:37  29.5S  176.6W mb=5.0  EMSC   KERMADEC ISLANDS REGION

O: 29APR2021 13:54:12  29.5S  176.5W mb=4.9  EMSC   KERMADEC ISLANDS REGION

O: 29APR2021 12:25:27  29.7S  176.8W mb=5.1  EMSC   KERMADEC ISLANDS REGION

O: 29APR2021 09:19:33  29.8S  177.7W mb=4.6  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 30APR2021 02:06:15  29.8S  177.6W mb=5.5  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 29APR2021 07:44:57  29.9S  177.7W mb=4.8  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 29APR2021 21:39:04  30.6S  177.6W mb=5.0  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 29APR2021 06:53:53  29.2S  176.9W mb=5.5  EMSC   KERMADEC ISLANDS REGION      

P: 26APR2021 133362    29.0S  177.0W 4.0-5.7 BAAAA  No. Kermadec Islands       

P: 30APR2021 133362    28.0S  176.0W 4.0-5.8 ABAAA  No. Kermadec Islands       

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: 29APR2021 17:40:36  21.6N  121.6E ML=3.7  EMSC   TAIWAN REGION

O: 29APR2021 14:35:40  21.8N  121.8E mb=4.5  EMSC   TAIWAN REGION

O: 29APR2021 14:32:59  21.9N  121.7E mb=4.7  EMSC   TAIWAN REGION

O: 29APR2021 14:35:41  21.9N  121.6E ML=4.8  TAI    Hualien, Taiwan              

O: 29APR2021 14:32:59  21.8N  121.7E ML=4.6  TAI    Hualien, Taiwan              

P: 28APR2021 133186    22.0N  122.0E 4.0-5.5 AAAAA  Taiwan                     

 

CWB reported the M 4.6 and M 4.8 were both felt with intensity IV in Taitung and I in Pingtung Counties, Taiwan.

 

 

O: 29APR2021 20:06:03  36.6N   71.1E mb=4.7  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 25APR2021 133209    36.0N   72.0E 3.8-5.3 BAAAA  Hindu Kush/Pakistan        

 

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

 

INDONESIA AND PHILIPPINES

 

O: 29APR2021 13:50:34   1.6S  134.4E ML=4.5  EMSC   NEAR N COAST OF PAPUA, INDONES

O: 29APR2021 07:26:34   1.8S  134.3E mb=4.7  EMSC   NEAR N COAST OF PAPUA, INDONESIA

P: 27APR2021 133140     3.0S  134.0E 4.0-5.6 ABAAA  West Irian, PNG            

 

O: 29APR2021 14:39:33   3.3N  120.9E ML=4.0  EMSC   CELEBES SEA                  

P: 26APR2021 133098     1.0N  122.0E 4.0-5.4 BCAAA  Celebes Sea                

 

O: 29APR2021 15:42:28   5.3S  146.3E mb=4.3  EMSC   EASTERN NEW GUINEA REG., P.N.G

O: 30APR2021 05:45:54   5.6S  146.4E mb=4.4  EMSC   EASTERN NEW GUINEA REG., P.N.G.

P: 27APR2021 133126     5.0S  146.0E 4.0-5.4 AAAAA  New Ireland                 

 

O: 29APR2021 22:20:17   9.1S  114.0E mb=4.6  EMSC   SOUTH OF BALI, INDONESIA     

P: 30APR2021 133131     9.0S  114.0E 4.0-5.6 AAAAA  So. of Bali                

 

NEIC reported this earthquake of M 4.6 in Bali  was felt with intensity II-III in the area(s) of  Bali at Kuta, Denpasar and Ubud.

 

CENTRAL AND SOUTH AMERICA

 

O: 29APR2021 08:22:19  17.0N   94.7W ML=4.2  EMSC   OAXACA, MEXICO               

O: 29APR2021 20:21:40  16.5N   95.2W ML=4.2  EMSC   OAXACA, MEXICO

P: 28APR2021 133147    16.0N   95.0W 3.5-5.2 AAAAA  Chiapas, Mexico            

 

O: 29APR2021 11:02:25  17.3N  101.5W mb=5.1  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 30APR2021 133156    17.0N  102.0W 3.5-5.5 AAAAA  Michoacan, Mexico          

 

NEIC reported this earthquake of M 5.0 in Guerrero, Mexico was felt with intensity II-III in the area(s) of Guerrero, Mexico in Ixtapa and Zihuatanejo.

 

O: 29APR2021 15:34:44  19.2N   67.2W Md=3.3  EMSC   PUERTO RICO REGION           

P: 25APR2021 133172    20.0N   68.0W 3.0-4.7 BAAAA  Bahamas/No. Caribbean      

 

O: 29APR2021 16:00:39  23.3S   68.7W Mw=4.7  EMSC   ANTOFAGASTA, CHILE

O: 30APR2021 05:04:23  22.8S   66.2W mb=4.7  EMSC   JUJUY, ARGENTINA             

P: 25APR2021 133357    21.0S   67.0W 4.0-5.9 BBAAA  Argentina                   

 

O: 29APR2021 20:52:49  27.3N  111.3W ML=3.6  EMSC   GULF OF CALIFORNIA           

P: 30APR2021 133175    28.0N  112.0W 3.5-5.0 AAAAA  Gulf of California         

 

AFRICA AND EUROPE

 

O: 29APR2021 11:37:37  64.1N   21.4W ML=3.5  EMSC   ICELAND                      

P: 25APR2021 133328    66.0N   18.0W 3.0-4.7 BBBAA  Iceland area               

 

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

 

SOUTHWEST PACIFIC

 

O: 30APR2021 05:18:31  11.9S  166.3E mb=5.1  EMSC   SANTA CRUZ ISLANDS           

P: 26APR2021 133355    12.0S  166.0E 4.0-5.7 BAAAA  Vanuatu Islands            

 

O: 29APR2021 10:01:11  20.7S  173.9W mb=5.0  EMSC   TONGA                        

P: 29APR2021 133369    20.0S  176.0W 4.0-5.8 AABAA  Tonga Islands              

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 29APR2021 13:55:31  29.2S  176.5W mb=5.0  EMSC   KERMADEC ISLANDS REGION

O: 29APR2021 06:50:30  29.4S  176.7W Mw=5.9  EMSC   KERMADEC ISLANDS REGION

O: 29APR2021 07:06:37  29.5S  176.6W mb=5.0  EMSC   KERMADEC ISLANDS REGION

O: 29APR2021 13:54:12  29.5S  176.5W mb=4.9  EMSC   KERMADEC ISLANDS REGION

O: 29APR2021 12:25:27  29.7S  176.8W mb=5.1  EMSC   KERMADEC ISLANDS REGION

O: 29APR2021 09:19:33  29.8S  177.7W mb=4.6  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 30APR2021 02:06:15  29.8S  177.6W mb=5.5  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 29APR2021 07:44:57  29.9S  177.7W mb=4.8  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 29APR2021 21:39:04  30.6S  177.6W mb=5.0  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 29APR2021 06:53:53  29.2S  176.9W mb=5.5  EMSC   KERMADEC ISLANDS REGION      

P: 26APR2021 133362    29.0S  177.0W 4.0-5.7 BAAAA  No. Kermadec Islands        

P: 30APR2021 133362    28.0S  176.0W 4.0-5.8 ABAAA  No. Kermadec Islands       

 

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: 29APR2021 20:04:27  33.3N  118.1W Ml=2.2  EMSC   GULF OF SANTA CATALINA, CALIF.

P: 28APR2021 133233    33.7N  117.5W 2.5-4.6 AAAAA  So. California             

 

O: 30APR2021 01:48:09  34.1N  117.5W Ml=2.1  EMSC   GREATER LOS ANGELES AREA, CALI

P: 28APR2021 133233    33.7N  117.5W 2.5-4.6 AAAAA  So. California             

 

O: 29APR2021 07:44:37  35.3N  116.8W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P: 25APR2021 133236    34.9N  116.4W 2.5-4.6 BAAAA  So. California             

 

O: 29APR2021 17:12:19  35.7N  117.4W Ml=3.1  EMSC   SOUTHERN CALIFORNIA          

P: 28APR2021 133239    35.7N  118.1W 2.5-5.1 AAAAA  So. California             

 

NEIC reported this earthquake of M 3.1 in Central California  was felt with intensity II-III in the area(s) of  Central California at Ridgecrest and Trona.

 

O: 30APR2021 03:00:55  36.6N  121.2W Md=2.6  EMSC   CENTRAL CALIFORNIA           

P: 29APR2021 133200    36.4N  121.0W 2.5-4.4 AAAAA  Central California         

 

O: 29APR2021 16:53:25  37.9N  118.6W ml=2.5  EMSC   CENTRAL CALIFORNIA

O: 29APR2021 19:51:35  37.5N  118.9W Md=2.6  EMSC   CENTRAL CALIFORNIA           

O: 30APR2021 02:27:28  37.6N  120.1W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P: 29APR2021 133195    37.4N  118.6W 2.5-4.7 AAAAA  California/Nevada area     

 

O: 29APR2021 09:36:34  38.4N  122.4W Md=2.1  EMSC   NORTHERN CALIFORNIA          

O: 29APR2021 14:08:39  38.8N  122.8W Md=2.7  EMSC   NORTHERN CALIFORNIA

P: 29APR2021 133202    38.7N  122.7W 2.5-4.5 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.7 in Geyserville, California was felt with intensity II-III in the area(s) of Geyserville, California.

 

O: 30APR2021 06:59:36  39.4N  120.2W ml=2.2  EMSC   NORTHERN CALIFORNIA          

P: 26APR2021 133203    39.4N  120.5W 2.5-4.6 BAAAA  Central California         

 

O: 29APR2021 07:23:11  40.3N  122.1W Md=2.2  EMSC   NORTHERN CALIFORNIA          

P: 27APR2021 133278    40.2N  121.2W 2.5-4.4 AAAAA  Northern California        

 

O: 29APR2021 12:23:10  40.3N  126.4W Ml=3.4  EMSC   OFF COAST OF NORTHERN CALIFORN

P: 29APR2021 133281    40.5N  125.8W 2.5-4.6 AAAAA  Off Coast of No. Calif     

 

ALASKA

 

O: 29APR2021 12:40:28  57.2N  154.8W ml=3.0  EMSC   KODIAK ISLAND REGION, ALASKA

O: 30APR2021 01:15:25  58.5N  152.4W ML=3.4  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 27APR2021 133323    60.5N  148.5W 3.2-5.1 BABAA  Central Alaska             

 

O: 29APR2021 14:55:19  63.4N  145.1W ML=3.1  EMSC   CENTRAL ALASKA               

P: 23APR2021 133327    63.3N  147.5W 3.2-5.0 CABAA  Central Alaska              

 

O: 29APR2021 13:33:14  64.3N  158.3W ML=3.5  EMSC   CENTRAL ALASKA               

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 29APR2021 13:24:55  43.8N  128.2W mb=4.1  EMSC   OFF COAST OF OREGON

O: 29APR2021 13:33:00  43.8N  128.4W mb=3.9  EMSC   OFF COAST OF OREGON

O: 29APR2021 10:30:21  43.9N  128.5W Mw=5.4  EMSC   OFF COAST OF OREGON

O: 29APR2021 10:35:45  43.9N  128.5W Mw=5.2  EMSC   OFF COAST OF OREGON

O: 29APR2021 10:58:35  43.9N  128.1W Mw=5.3  EMSC   OFF COAST OF OREGON

O: 29APR2021 10:25:16  44.0N  128.0W mb=4.3  EMSC   OFF COAST OF OREGON

O: 29APR2021 13:24:55  43.8N  128.2W mb=4.1  EMSC   OFF COAST OF OREGON          

P: 29APR2021 133282    44.1N  128.8W 3.0-4.7 AAAAA  Off Coast of Oregon        

 

ROCKY MOUNTAINS REGION

 

O: 30APR2021 02:14:52  41.2N  111.7W ML=3.0  EMSC   UTAH                         

P: 27APR2021 133298    43.0N  111.5W 2.0-4.1 BBAAA  Yellowstone/Wyoming        

P: 28APR2021 133260    41.8N  108.7W 2.0-4.1 AACAA  Colorado area              

 

NEIC reported this earthquake of M 2.9-3.0 in Utah was felt with intensity II-III in the area(s) of Utah at Morgan, Huntsville, Layton, Ogden, Eden, Kaysville, Rountiful, and Salt Lake City.

 

O: 29APR2021 06:58:54  38.3N  113.1W Ml=2.2  EMSC   UTAH                         

P: 24APR2021 133251    38.3N  112.2W 2.0-3.9 BAAAA  Utah area                  

 

O: 29APR2021 07:38:09  44.3N  115.0W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 29APR2021 12:18:21  44.2N  115.0W Ml=2.0  EMSC   SOUTHERN IDAHO               

P: 28APR2021 133269    44.4N  115.2W 2.0-4.1 AAAAA  Montana/Idaho              

 

O: 30APR2021 02:46:44  31.7N  104.6W mb=2.6  EMSC   WESTERN TEXAS

O: 29APR2021 22:19:29  31.6N  104.3W ML=3.1  EMSC   WESTERN TEXAS                

P: 24APR2021 133227    32.6N  104.6W 2.0-3.9 BAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 28APR2021 15:11:21  65.4N   86.2W MB=3.1  ECAN Repulse Bay, NU                

P: 28APR2021 133330    64.0N   87.0W 2.5-4.2 AAAAA  Nunavit/Hudson Bay, Canada 

 

O: 28APR2021 16:06:47  75.1N   96.4W MB=2.3  ECAN Polaris, NU                    

P: 28APR2021 133330    64.0N   87.0W 2.5-4.2 ADCAA  Nunavit/Hudson Bay, Canada 

 

O: 28APR2021 16:10:06  45.0N   68.0W MB=2.1  ECAN St. Stephen, NB                

P: 26APR2021 133274    47.3N   70.5W 2.0-3.9 ACBAA  New England                

 

O: 29APR2021 07:39:27  49.0N   67.6W MB=2.7  ECAN Matane, QC Share this page * Blo

P: 28APR2021 133261    49.0N   66.0W 2.0-3.9 AAAAA  E. of Maine                

 

HAWAII

 

O: 29APR2021 12:55:09  19.5N  155.7W Ml=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

P: 28APR2021 133176    20.1N  156.1W 4.0-5.8 AAAAA  Hawaii area                

 

MODERATELY STRONG QUAKE SHAKES MAULE, CHILE

 

EARTHQUAKE SUMMARY FOR  APRIL 28, 2021

 

The strongest earthquake felt in the world today was an M 5.7 in Neuquen, Argentina. NEIC reported it was felt with maximum intensity IV in Bio Bio, Chile at Mutchen, Los Angeles, Laja, and Chiguayante with lesser shaking in Concepcion, Talcahuano, Nacimento, Cabrero, and Chilan. GUC reported this earthquake was felt with intensity  V in  Maule at Constitucion, IV in Cauquenes, Linares, Parral, Pelluhue, III in Yerbas Buenas, Villa Alegre, Talca, San Javier, Sagrada Familia, Pencahue, Pelarco, Longavi, Curico, in O'Higgins with IV in Pumanque and III in Lolol, Palmilla, Oeralillo, Santa Cruz; and in Santiago with III in Cerro Vavia and San Bernrdo and II in El Monte and Pedro Aguirre Cerda, Chile. This unusual felt pattern is probably due to the intermediate depth (137 km) of this hypocenter. The last earthquake within about 200 km of this epicenter with M>=5.7 was an M 5.9 on May 29, 2017 about 100 km west of today's epicenter. Today's event is the largest under Argentina within about 200 km since an M 5.9-6.0 on June 7, 2021. Forecasts 133374 and 133375 had expected today's event was likely in this area around April 24-27.

 

O: 29APR2021 02:17:16  37.2S   70.8W Mw=5.7  EMSC   NEUQUEN, ARGENTINA           

O: 29APR2021 02:17     37.3S   71.2W mb=5.4  GUC    Maule at Constitucion, IV in C

P: 24APR2021 133374    36.0S   73.0W 4.0-5.6 BBBAA  Central Chile              

P: 27APR2021 133375    39.0S   73.0W 4.0-5.5 ABBAA  Central Chile              

 

The strongest earthquake in the world that was not felt today was an M 5.9 in the continuing aftershock sequence in the northern Kermadec Islands, New Zealand. This followed an M 5.4 off northern North Island, New Zealand. The last earthquake in this aftershock zone in northern Kermadec Islands with M>=5.9 occurred on April 27, 2021 - also with M 5.9. Earthquakes of M 6.0 on April 7 and M 6.5 on April 1 complete the list of similar earthquakes since the immediate aftershocks of the M 8.1 on March 4.  Forecasts 133362 had expected today's activity in the aftershock zone within about 50 km of this epicenter around April 26-30. 

 

O: 28APR2021 15:25:20  29.3S  176.8W mb=4.8  EMSC   KERMADEC ISLANDS REGION

O: 29APR2021 06:50:31  29.3S  176.7W Mw=5.9  EMSC   KERMADEC ISLANDS REGION      

P: 26APR2021 133362    29.0S  177.0W 4.0-5.7 BAAAA  No. Kermadec Islands       

P: 30APR2021 133362    28.0S  176.0W 4.0-5.8 ABAAA  No. Kermadec Islands       

 

 

A moderate earthquake of M 5.4-5.8 occurred today off the east coast of North Island, New Zealand. NEIC reported it was felt with maximum intensity IV in Gisborne, New Zealand at Ruatoria, Tolaga Bay and Gisborne and in Opotiki, Whakatane, Bay of Plenty and in Nuhaka, and Wairoa, Hawkes Bay. GEONET reported this earthquake was felt with weak intensity in North Island, New Zealand with 906 reports of which 626 reported weak shaking; 250 light, 26 moderate, 2 strong, 0 Severe and 0 extreme intensity. The last earthquake in this aftershocks zone with M>=5.8 occurred on April 5, 2021 with M 6.0. The only other such aftershock of M>=5.8 in the area since the M 7.3 on March 4 was an M 6.3 on March 6, 2021.  Forecast 133378 had expected today's event was likely around April 28.

 

O: 29APR2021 03:58:47  37.6S  179.7E ML=5.8  GEONET Felt with weak intensity

O: 29APR2021 03:58:45  37.7S  179.7E Mw=5.4  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 28APR2021 133378    37.0S  179.0W 3.5-4.9 AAAAA  E. of North Islands N.Z.   

 

The M 5.8 off North Island was preceded by an M 4.5-4.6 about 200 km to the west earlier in the day.  GEONET reported this earthquake was felt by 216 people with weak intensity by 174 and light intensity by 39 persons and moderate intensity by 3. Strong shaking was felt by 0 with no one feeling the quake with severe and 0 with extreme intensity. This event had been expected in forecast 133380 within about 100 km to occur around April 25.

 

O: 28APR2021 19:33:35  37.2S  177.3E ML=4.5  GEONET reported felt

O: 28APR2021 19:33:32  37.3S  177.3E mb=4.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 25APR2021 133380    38.0S  178.0E 3.0-4.6 BAAAA  North Island, N.Z.         

 

Aftershocks continued today in the area of Assam, India following the M 6.4 in

that area yesterday. The strongest of these was an M 4.8 which NEIC reported was

felt with maximum intensity VII in Bondila, Arunachal Pradesh, India with IV in Assam at Sualkuch, Gauhati, Dispur, Dhekiajuli, Tezpur and III in Nagao, Raha Gaon, North Gawahati, and III in Gohpur, Rana Gaon, Nagaon, Assam, India. Forecast 133182 had expected activity in  this area to the west was likely in late April.

 

O: 28APR2021 19:50:53  26.8N   92.5E mb=4.8  EMSC   ASSAM, INDIA

O: 28APR2021 12:09:57  26.6N   92.4E ML=3.0  EMSC   ASSAM, INDIA                 

P: 24APR2021 133182    27.0N   88.0E 3.5-5.4 BACAA  Nepal                      

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 off the coast of Oregon. This is the strongest earthquake within about 150 km of this epicenter since an M 5.1 and  an M 4.9 on February 20, 2021. A moderate quake of M 5.7 on December 29, 2020 was the only other such earthquake in the area in the past year. Forecast 133282 had expected today's event was likely around  April 29.

 

O: 28APR2021 21:36:26  43.9N  127.9W mb=4.4  EMSC   OFF COAST OF OREGON          

P: 29APR2021 133282    44.1N  128.8W 3.0-4.7 AAAAA  Off Coast of Oregon        

 

An earthquake of M 2.8 was widely felt in the area of San Francisco Bay, California. NEIC reported intensity IV n Berkeley and II-III associated with this event in Oakland, and Orinda as well as other communities. This continues enhanced seismicity in the area including an M 2.6 on April 26. Earthquakes of stronger magnitude in the San Francisco Bay area have most recently occurred as an M 3.0 on April 1, 2021 and an M 4.0 on February 8, 2021. Forecast 133201 had expected today's event within about 15 km of this epicenter was likely around April 27.

 

O: 28APR2021 07:18:37  37.9N  122.2W Md=2.8  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 27APR2021 133201    38.0N  122.3W 2.5-4.7 AAAAA  Central 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: 29APR2021 05:57:44  36.3N   71.1E mb=4.1  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 25APR2021 133209    36.0N   72.0E 3.8-5.3 BAAAA  Hindu Kush/Pakistan        

 

O: 28APR2021 19:50:53  26.8N   92.5E mb=4.8  EMSC   ASSAM, INDIA

O: 28APR2021 12:09:57  26.6N   92.4E ML=3.0  EMSC   ASSAM, INDIA                 

P: 24APR2021 133182    27.0N   88.0E 3.5-5.4 BACAA  Nepal                      

 

INDONESIA AND PHILIPPINES

 

O: 28APR2021 15:46:38   0.7S  134.6E ML=4.4  EMSC   NEAR N COAST OF PAPUA, INDONES

P: 27APR2021 133140     3.0S  134.0E 4.0-5.6 ACAAA  West Irian, PNG            

 

O: 28APR2021 11:33:15   1.0N   96.6E mb=4.7  EMSC   NIAS REGION, INDONESIA       

P: 22APR2021 133111     1.0N   97.0E 4.0-5.6 CAAAA  Nicobar Islands            

P: 27APR2021 133111     2.0N   95.0E 4.0-5.8 AABAA  Nicobar Islands            

 

O: 29APR2021 00:54:54   2.4N  126.7E mb=4.9  EMSC   MOLUCCA SEA                  

P: 25APR2021 133107     4.0N  127.0E 4.0-5.4 BBAAA  Halmahera                   

 

O: 28APR2021 11:37:34   4.2S  133.8E ML=4.3  EMSC   NEAR S COAST OF PAPUA, INDONES

P: 27APR2021 133140     3.0S  134.0E 4.0-5.6 ABAAA  West Irian, PNG            

 

O: 28APR2021 10:48:35   5.3S  129.9E ML=4.0  EMSC   BANDA SEA                     

P: 28APR2021 133142     6.0S  131.0E 4.0-5.6 AAAAA  West Irian, PNG            

 

O: 28APR2021 15:50:45   7.1S  129.4E mb=4.2  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 28APR2021 133114     7.0S  129.0E 4.0-5.5 AAAAA  Banda Sea                  

 

O: 28APR2021 19:27:10   9.0S  119.0E ML=4.0  EMSC   SUMBAWA REGION, INDONESIA    

P: 29APR2021 133121     8.0S  121.0E 4.0-5.5 AABAA  Flores Island area         

 

O: 29APR2021 04:08:44  18.4N  145.7E Mw=5.5  EMSC   PAGAN REG., N. MARIANA ISLANDS

P: 29APR2021 133161    17.0N  147.0E 4.0-5.4 ABAAA  No. Marianas               

 

CENTRAL AND SOUTH AMERICA

 

O: 28APR2021 07:43:26  13.2N   89.2W mb=4.0  EMSC   OFFSHORE EL SALVADOR         

P: 29APR2021 133148    14.0N   89.0W 3.5-5.2 AAAAA  Coast of Central America   

 

NEIC reported this earthquake of M 4.0 in El Salvador was felt with intensity II-III in the area(s) of El Salvador at Iopango, San Salvador and in Santa Catarina, Guatemala.

 

O: 28APR2021 07:52:11  15.5N   92.5W ML=4.1  EMSC   CHIAPAS, MEXICO               

P: 29APR2021 133146    14.0N   93.0W 3.5-5.2 ABAAA  Chiapas, Mexico            

 

O: 28APR2021 15:27:31  16.7N   94.8W ML=4.1  EMSC   OAXACA, MEXICO

O: 28APR2021 08:43:01  15.5N   95.9W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 28APR2021 133147    16.0N   95.0W 3.5-5.2 AAAAA  Chiapas, Mexico            

 

O: 29APR2021 02:49:42  17.4S   69.9W mb=4.8  EMSC   SOUTHERN PERU                

P: 22APR2021 133349    17.0S   69.0W 4.0-5.8 CAAAA  So. Peru/Bolivia           

 

NEIC reported this earthquake of M 4.8 in Southern Peru was felt with intensity II-III in the area(s) of Southern Peru at Tarata, Tacna and Arica, Tarapaca, Chile.

 

O: 28APR2021 17:46:56  18.0N   67.0W ML=3.0  EMSC   PUERTO RICO REGION

O: 29APR2021 04:51:41  17.9N   66.8W ML=3.4  EMSC   PUERTO RICO REGION           

P: 27APR2021 133166    18.0N   66.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 28APR2021 18:58:52  22.1S   63.7W mb=4.7  EMSC   SALTA, ARGENTINA             

P: 26APR2021 133358    24.0S   64.0W 4.0-5.9 ABAAA  Argentina                  

 

O: 28APR2021 12:25:59  24.1S   70.1W ML=4.0  EMSC   ANTOFAGASTA, CHILE           

P: 27APR2021 133358    24.0S   68.0W 4.0-5.6 AABAA  Argentina                  

 

O: 29APR2021 02:21:29  25.2N   99.8W ML=4.2  EMSC   NUEVO LEON, MEXICO           

 

O: 28APR2021 18:25:11  34.0S   72.3W ML=4.1  EMSC   OFFSHORE O'HIGGINS, CHILE    

P: 26APR2021 133373    34.0S   73.0W 4.0-5.7 AAAAA  Central Chile              

 

O: 29APR2021 02:17:16  37.2S   70.8W Mw=5.7  EMSC   NEUQUEN, ARGENTINA           

P: 24APR2021 133374    36.0S   73.0W 4.0-5.6 BBBAA  Central Chile              

P: 27APR2021 133375    39.0S   73.0W 4.0-5.5 ABBAA  Central Chile              

 

O: 28APR2021 07:32:50  40.2S   75.0W Mw=4.1  EMSC   OFF COAST OF LOS LAGOS, CHILE

P: 27APR2021 133375    39.0S   73.0W 4.0-5.5 ABBAA  Central Chile              

 

AFRICA AND EUROPE

 

O: 28APR2021 12:40:52  35.5N    3.5W ML=4.1  EMSC   STRAIT OF GIBRALTAR          

P: 29APR2021 133216    37.0N    3.0W 3.5-5.0 ABAAA  Morocco/Spain              

 

O: 28APR2021 11:32:12  36.3N    7.8E mb=4.1  EMSC   NORTHERN ALGERIA             

P: 26APR2021 133253    37.0N    3.0E 3.0-4.5 AACAA  Western Mediterranean      

 

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: 28APR2021 12:30:14  37.9S   49.1E mb=4.6  EMSC   SOUTHWEST INDIAN RIDGE       

P: 29APR2021 133386    41.0S   43.0E 4.0-5.6 ACCAA  So. Indian Ocean           

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 28APR2021 15:25:20  29.3S  176.8W mb=4.8  EMSC   KERMADEC ISLANDS REGION

O: 29APR2021 06:50:31  29.3S  176.7W Mw=5.9  EMSC   KERMADEC ISLANDS REGION      

P: 26APR2021 133362    29.0S  177.0W 4.0-5.7 BAAAA  No. Kermadec Islands       

P: 30APR2021 133362    28.0S  176.0W 4.0-5.8 ABAAA  No. Kermadec Islands       

 

O: 28APR2021 19:33:32  37.3S  177.3E mb=4.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 25APR2021 133380    38.0S  178.0E 3.0-4.6 BAAAA  North Island, N.Z.         

 

O: 29APR2021 03:58:45  37.7S  179.7E Mw=5.4  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 28APR2021 133378    37.0S  179.0W 3.5-4.9 AAAAA  E. of North Islands N.Z.   

 

O: 28APR2021 12:41:37  39.7S  176.3E ML=3.5  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 29APR2021 133381    39.0S  176.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

O: 29APR2021 00:12:52  45.0N  147.9E mb=4.3  EMSC   KURIL ISLANDS                

P: 28APR2021 133290    45.0N  149.0E 3.5-5.6 AAAAA  So. Kurils                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 28APR2021 10:50:21  33.2N  116.4W ML=3.5  EMSC   SOUTHERN CALIFORNIA

O: 28APR2021 19:17:54  33.2N  115.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 28APR2021 15:04:30  32.8N  115.8W Ml=2.0  EMSC   SOUTHERN CALIFORNIA          

P: 29APR2021 133231    32.4N  115.8W 2.5-4.5 AAAAA  So. California             

 

NEIC reported this earthquake of M 3.5 in Southern California was felt with intensity II-III in the area(s) of Southern California in Borrego Springs, Ranchita, Julian, Ramona, Alpine, Lakeside, Escondido, El Cajon, Valley Center.

 

O: 29APR2021 01:41:02  36.8N  121.4W Md=2.0  EMSC   CENTRAL CALIFORNIA           

P: 27APR2021 133200    36.8N  121.3W 2.5-4.7 AAAAA  Central California         

 

O: 28APR2021 21:20:28  38.1N  118.3W ml=2.1  EMSC   NEVADA                       

P: 25APR2021 133195    38.0N  118.0W 2.5-4.7 BAAAA  California/Nevada area     

 

O: 28APR2021 22:09:00  38.2N  116.7W ml=2.9  EMSC   NEVADA

O: 28APR2021 11:57:24  38.2N  116.7W ML=4.1  EMSC   NEVADA                       

P: 23APR2021 133196    38.7N  115.4W 2.5-4.4 BABAA  California/Nevada area     

 

NEIC reported this earthquake of M 4.1 in Nevada was felt with intensity II-III in the area(s) of Nevada at Glenbrook.

 

O: 28APR2021 14:49:43  39.1N  120.0W Md=2.4  EMSC   NORTHERN CALIFORNIA          

P: 29APR2021 133278    40.0N  120.9W 2.5-4.5 AAAAA  Northern California        

P: 26APR2021 133203    39.4N  120.5W 2.5-4.6 AAAAA  Central California         

 

O: 28APR2021 19:33:38  40.7N  124.6W Md=2.6  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 28APR2021 09:56:49  40.3N  124.5W Md=2.0  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 30APR2021 133279    40.2N  124.2W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

ALASKA

 

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

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 28APR2021 21:36:26  43.9N  127.9W mb=4.4  EMSC   OFF COAST OF OREGON          

P: 29APR2021 133282    44.1N  128.8W 3.0-4.7 AAAAA  Off Coast of Oregon        

 

O: 29APR2021 03:37:46  47.7N  121.7W ML=2.5  EMSC   WASHINGTON                   

P: 28APR2021 133295    47.5N  121.8W 2.0-4.2 AAAAA  Washington state, U.S.     

 

NEIC reported this earthquake of M 2.5 in Washington State was felt with intensity II-III in the area(s) of Washington State at Duval, Snoqualme, Carnation, Gold Bay, North Bend, Monroe, Woodinville, Redmond, Bothell and Bellevue.

 

O: 28APR2021 15:03:50  47.8N  122.7W ML=2.3  EMSC   SEATTLE-TACOMA AREA, WASHINGTO

O: 28APR2021 15:03:50  47.8N  122.7W ML=2.5  ANSS   SEATTLE-TACOMA AREA, WASHINGTO

P: 27APR2021 133297    48.4N  123.2W 2.0-4.2 AAAAA  Washington state, U.S.     

 

This M 2.5 also occurred near Poulsbo, Washington earlier in the day and was felt with intensity II in Poulsbo, Bainbridge, Seattle and Blaine.

 

ROCKY MOUNTAINS REGION

 

O: 29APR2021 04:18:34  31.7N  104.3W ML=2.6  EMSC   WESTERN TEXAS                

P: 24APR2021 133227    32.6N  104.6W 2.0-3.9 BAAAA  SW U.S.A                   

 

O: 28APR2021 11:21:04  44.3N  115.1W Ml=2.3  EMSC   SOUTHERN IDAHO

O: 28APR2021 10:30:12  44.0N  115.2W Ml=2.5  EMSC   SOUTHERN IDAHO               

P: 28APR2021 133269    44.4N  115.2W 2.0-4.1 AAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 28APR2021 18:02:52  35.4N   98.1W ML=2.4  EMSC   OKLAHOMA                     

O: 28APR2021 12:23:43  36.4N   97.4W mb=2.1  EMSC   OKLAHOMA                     

P: 30APR2021 133246    36.0N   97.0W 2.0-4.4 AAAAA  Southern Plains            

 

O: 27APR2021 16:43:17  73.9N   96.2W MB=3.1  ECAN Resolute, NU                   

P: 28APR2021 133330    64.0N   87.0W 2.5-4.2 ADCAA  Nunavit/Hudson Bay, Canada 

 

HAWAII

 

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

 

FULL MOON PROMOTES STRONG QUAKES IN INDIA, NEW GUINEA AND KERMADEC ISLANDS

 

EARTHQUAKE SUMMARY FOR  APRIL 27, 2021

 

The strongest earthquake in the world today was an M 6.0 in Assam, India. The National Center for Seismology (NCS) of India gives this event M 6.4. The mainshock was reported felt with maximum shaking and damage in Assam at Udalguri; VII in Dhekiajuly, Rangapara, Nagaon, VI in Tezpur, Tangla, Raha Gaon and North Guwahati and V in Gauhati, Assam, India. An M 4.7 aftershock was felt with intensity VII in Assam at Tezpur; VI m Gauhati, and Samdrup; V in Dohu, Palasbari, Bondila, Nagaon; IV in Dispur and Shillong, Meghalaya, India.

Cracks appeared in walls, ceilings and floors of some buildings, with some reports of collapsed ceilings and walls, but there were no immediate reports of casualties. Internet showed extensive damage in some areas. People fled their homes into the streets during the earthquake. The last earthquake within about 250 km of today's activity with M>=6.0 occurred on September 21, 2009, the only such event in this region in at least 30 years although an M 5.9-6.0 quake hit about 200 km south of this on May 8, 1997. The last event of larger magnitude in the general area of northern India was an M 6.9 at intermediate depth on April 13, 2016 in Bangladesh.  Forecast 133180 had expected today's event to the southeast was likely around April 23. This event is located at 103 degrees from the M 8.1 in the Kermadec Islands of March 4, 2021 and th M 7.3 in North Island, New Zealand of the same date. After large earthquakes reflections off the core-mantle boundary seismic energy returns to the surface in the area of 103 degrees from the epicenter of the strong quake. Seismicity at this distance often increases following and is probably promoted by energy from the strong quake as in  this case and had been expected at the time of the Kermadec quake to  occur in northern India as:

 

"Far field seismic enhancement following the events in the Kermadec area is likely to include areas of … and central Asia north of India" (March 4, 2021)

 

O: 28APR2021 02:33:00  26.7N   92.5E mb=4.9  EMSC   ASSAM, INDIA

O: 28APR2021 02:43:21  26.7N   92.4E ML=4.0  EMSC   ASSAM, INDIA

O: 28APR2021 02:21:25  26.8N   92.4E Mw=6.0  EMSC   ASSAM, INDIA

O: 28APR2021 02:21:25  26.7N   92.4E Mw=6.4  NCS    ASSAM, INDIA

O: 28APR2021 03:14:34  26.6N   92.5E ML=3.6  EMSC   ASSAM, INDIA

O: 28APR2021 05:09:12  26.6N   92.5E ML=3.4  EMSC   ASSAM, INDIA

O: 28APR2021 02:55:40  26.5N   92.5E ML=3.6  EMSC   ASSAM, INDIA                  

P: 23APR2021 133180    25.0N   95.0E 4.0-5.4 BBBAA  Myanmar                    

 

A strong M 5.9-6.1 earthquake also occurred in New Guinea today. NEIC reported it was felt with intensity V in Goroka, Eastern Highlands, Papua New Guinea. It was followed by moderate aftershocks of M 5.4 and 5.2. This activity follows an M 5.7 foreshock in the region which was noted in the previous issue of this summary as:

 

"The strongest earthquake in the world today was an M 5.7 in Papua New Guinea. It was reported with light intensity as far as Queensland, Australia. This event occurred within minutes of local solar noon and an hour of the full moon in a region where which was expected to see maximum tidal stresses with this full moon. It was likely triggered by effects related to the full moon. ...

 

 

This may also be related to the minor geomagnetic storm currently active as this  epicenter lies on the geomagnetic equator where effects of such storms are at maximum. ...

 

 

Today's event was forecast within about 150 km of this epicenter to occur around April 27. An M 6.0 near this epicenter occurred on April 10, 2021. This may be an aftershock of that event." (April 27, 2021)

 

Today's event of M 6.1 is the largest in the area since an M 6.4 on February 7, 2021 and prior to that an M 6.2 on January 17, 2019. Forecast 133126 had expected this activity was likely around April 27.

 

O: 27APR2021 10:40:49   3.4S  145.5E mb=5.4  EMSC   NEAR N COAST OF NEW GUINEA, PNG.

O: 27APR2021 11:04:24   3.4S  145.6E Mw=5.3  EMSC   NEAR N COAST OF NEW GUINEA, PNG.

O: 27APR2021 08:03:49   3.6S  145.7E mb=5.1  EMSC   NEAR N COAST OF NEW GUINEA, PNG.

O: 27APR2021 15:01:11   4.0S  145.6E ML=4.6  EMSC   NEAR N COAST OF NEW GUINEA, PNG.

O: 27APR2021 08:05:32   3.4S  145.5E Mw=5.9  EMSC   NEAR N COAST OF NEW GUINEA, PN

O: 27APR2021 08:05:32   3.4S  145.5E Mw=6.1  ANSS   NEAR N COAST OF NEW GUINEA, PN

P: 27APR2021 133126     5.0S  146.0E 4.0-5.4 AAAAA  New Ireland                

 

A series of moderate to strong aftershocks in the northern Kermadec Islands of New Zealand also continued today with the largest of M 5.9-6.0. This series had been noted in the previous issue of this summary as:

 

"The most active area of the world today was the northern Kermadec Islands. Moderately large event occurred in the area with M 5.5 and 5.7-5.8. These are aftershocks of the M 8.1 in the area that occurred on March 4, 2021. Earthquakes of M 5.0 and 5.5 in the sequence occurred near local solar midnight and local solar noon and may have been promoted by high tidal stresses associated with today's full moon. Forecast 133362 had expected today's activity withini about 50 km was likely around April 26." (April 26-27, 2021)

 

Forecasts 133370 and 133362 had expected today's activity at the end of April with magnitude up to M 5.9.

 

O: 27APR2021 13:29:11  29.4S  176.7W mb=4.8  EMSC   KERMADEC ISLANDS REGION

O: 28APR2021 02:57:25  29.4S  176.6W mb=5.1  EMSC   KERMADEC ISLANDS REGION

O: 27APR2021 18:28:57  29.5S  176.7W mb=4.9  EMSC   KERMADEC ISLANDS REGION

O: 28APR2021 04:24:32  29.5S  176.7W mb=4.9  EMSC   KERMADEC ISLANDS REGION

O: 27APR2021 16:43:10  29.6S  176.7W mb=5.1  EMSC   KERMADEC ISLANDS REGION

O: 27APR2021 17:15:48  29.6S  176.7W mb=5.0  EMSC   KERMADEC ISLANDS REGION

O: 27APR2021 17:53:07  29.7S  176.9W Mw=5.3  EMSC   KERMADEC ISLANDS REGION

O: 27APR2021 23:14:40  30.1S  179.4E ML=4.3  EMSC   KERMADEC ISLANDS REGION

O: 27APR2021 16:33:33  29.1S  176.8W Mw=5.9  EMSC   KERMADEC ISLANDS REGION      

P: 26APR2021 133370    27.0S  176.0W 4.0-5.6 AAAAA  Tonga Islands              

P: 26APR2021 133362    29.0S  177.0W 4.0-5.7 AAAAA  No. Kermadec Islands       

P: 30APR2021 133362    28.0S  176.0W 4.0-5.8 AAAAA  No. Kermadec Islands       

 

An unusual earthquake of M 4.7 occurred in the Amazon region of Brazil today. NEIC reported it was felt in Brazil at Manaus, Amazonas. This event occurred within about 30 minutes of local solar midnight and was probably promoted by strong tidal stresses associated with today's full moon. This summary had forecast tidal effects on seismicity with this full moon in previous issues as:

 

"The full moon arrived on April 27, 2021 at 03:31 UT. Longitudes which were sub-solar (local solar noon) at this time were near 130 East Longitude while those near local solar midnight area near 50 West longitude. Those in the west include the Atlantic Ocean as far as the eastern Caribbean and the Shetland and South Sandwich Islands and in the east in western Japan, Taiwan, the Philippines and Central Indonesia. These areas may see enhanced seismicity within about 3 days of the full moon." (April 27, 2021)

 

The last earthquake located within about 300 km of this epicenter in Brazil with M>=4 was an M 4.4 about 300 km to the southwest on February 8, 2005 and an M 4.2 about 250 km northwest of this epicenter on March 15, 1999. No events of M>=4.7 have been recorded in this area in at least 30 years until today.

 

O: 28APR2021 03:26:40   0.5S   61.6W mb=4.7  EMSC   AMAZONAS-RORAIMA BORDER, BRAZI

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 north of Anchorage, Alaska. NEIC reported maximum intensity IV in Anchorage with III in Elmendorf AFB, Fort Richardson and Wasilla, Alaska, among other communities. An M 4.1-4.3 preceded this event about 100 km to the south. NEIC reported this event was felt with intensity IV in Fort Richardson and II-III in Seward, Moose Pass, Valdez, Girdwood, Eagle River, Anchorage. The last earthquake in the Anchorage area of M>=4.7 within about 200 km of today's epicenter was an M 5.3 on February 27, 2021 and prior to that an M 5.0 on November 7, 2020 an October 4, 2019. These are aftershocks of th M 7.0 of November 30, 2018. Forecast 133323 had expected today's activity was likely within about 100 km around April 25-27. Like the event in Assam, India, the M 4.7 is located at 102-103 degrees from the M 7.3 off North Island, New Zealand and may have been promoted by energy from that source.

 

A glacial surge has been occurring in southeastern Alaska. It was accompanied today by an M 2.6 Ice quake, one of the strongest in recent history. The surge is happening in Denali Park in Muldrow glacier and on April 12 reached speeds up to 100 feet per day, about 100 times as fast as normal.

 

O: 28APR2021 04:44:39  58.5N  136.8W ML=2.6  EMSC   SOUTHEASTERN ALASKA          

P: 26APR2021 133318    58.0N  139.0W 3.0-4.8 AABAA  Southeast Alaska           

 

O: 27APR2021 17:26:00  60.4N  147.7W mb=4.3  EMSC   SOUTHERN ALASKA              

P: 25APR2021 133323    61.2N  147.4W 3.2-5.0 AAAAA  Central Alaska             

 

O: 27APR2021 17:54:36  61.3N  150.0W Mw=4.8  ANSS   SOUTHERN ALASKA              

O: 27APR2021 17:54:34  61.3N  150.0W Mw=4.7  EMSC   SOUTHERN ALASKA              

P: 27APR2021 133323    60.5N  148.5W 3.2-5.1 AAAAA  Central Alaska             

 

An earthquake of M 2.8 was widely felt in the area of San Francisco Bay, California. NEIC reported intensity IV n Berkeley and II-III associated with this event in Oakland, and Orinda as well as other communities. This continues enhanced seismicity in the area including an M 2.6 on April 26. Earthquakes of stronger magnitude in the San Francisco Bay area have most recently occurred as an M 3.0 on April 1, 2021 and an M 4.0 on February 8, 2021. Forecast 133201 had expected today's event within about 15 km of this epicenter was likely around April 27.

 

O: 28APR2021 07:18:37  37.9N  122.2W Md=2.8  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 27APR2021 133201    38.0N  122.3W 2.5-4.7 AAAAA  Central California         

 

A series of light earthquakes also shook the region of Los Angeles, California near local solar noon today. These could be precursory to a larger regional event in the next week. They occurred near 100 degrees from the M 6.0 in  Papua New Guinea earlier in the day, a distance at which triggering is possible from larger earthquakes. Forecast 133234 had expected today's activity was likely within about 10 km of this epicenter around April 25.

 

O: 27APR2021 18:27:19  33.9N  118.4W Ml=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 27APR2021 19:36:08  33.9N  118.4W Ml=2.1  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 27APR2021 18:17:48  34.0N  118.4W Ml=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 27APR2021 16:38:12  33.9N  118.4W Ml=2.4  EMSC   GREATER LOS ANGELES AREA, CALI

P: 25APR2021 133234    33.9N  118.3W 2.5-4.8 AAAAA  So. California             

 

An earthquake of M 4.1 was accompanied by events of M 3.0 and 3.4 in western Texas today.  NEIC reported an earthquake of M 4.0 in Western Texas was felt with intensity II-III in the area(s) of Carlsbad, New Mexico.  This event occurred near local solar noon and was probably promoted by strong tidal stresses associated with today's full moon, which maximize near this hour.  The M 4.1 occurred near local solar noon and was probably enhanced by strong tidal stresses associated with the full moon which maximize near this hour. The only earthquake in this region of Texas in the past year with greater magnitude was an M 4.5 on March 17, 2021. These are probably aftershocks of an M 5.0 on March 26, 2020. Like today's event of M 4.0-4.1, the M 5.0 on March 26, 2020 occurred a day after the new moon tidal event. Forecast 133227 had expected today's event around April 24. Like the events in Anchorage, Alaska and Assam, India, the M 4.1 in western Texas is located near 100 degrees from the M 7.3 off North Island, New Zealand and may have been promoted by energy from that source.

 

O: 27APR2021 13:21:18  31.7N  104.2W ML=3.0  EMSC   WESTERN TEXAS

O: 27APR2021 19:42:10  31.7N  104.4W ML=4.1  EMSC   WESTERN TEXAS

O: 27APR2021 19:42:10  31.7N  104.4W ML=4.0  ANSS   WESTERN TEXAS

O: 28APR2021 02:10:42  31.7N  104.6W ML=3.4  EMSC   WESTERN TEXAS

O: 27APR2021 13:06:07  31.7N  104.2W ML=2.7  EMSC   WESTERN TEXAS                

P: 24APR2021 133227    32.6N  104.6W 2.0-3.9 BAAAA  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: 27APR2021 20:27:47  23.2N  120.9E ML=4.0  EMSC   TAIWAN

O: 27APR2021 21:48:02  23.2N  120.9E ML=4.1  EMSC   TAIWAN

O: 27APR2021 22:10:53  23.2N  120.9E Mw=4.5  EMSC   TAIWAN

O: 27APR2021 22:10:51  23.2N  120.9E ML=4.6  TAI    Hualien, Taiwan              

O: 27APR2021 21:48:02  23.2N  120.9E ML=4.1  TAI    Hualien, Taiwan              

O: 27APR2021 20:27:47  23.2N  120.9E ML=4.0  TAI    Hualien, Taiwan              

P: 24APR2021 133187    23.0N  122.0E 4.0-5.4 BAAAA  Taiwan                     

P: 28APR2021 133186    22.0N  122.0E 4.0-5.5 ABAAA  Taiwan                     

 

CWB reported the M 4.6 was felt with intensity IV in Kaohsiung; III in Taitung, II in Chiayi, Hualien, Tainan, and I in Pingtung, Yunlin, Changhua and Miaoli Counties, Taiwan.

The other events were felt with intensity I-II in the epicentral area.

 

O: 28APR2021 05:55:02  27.8N   57.4E ML=3.6  EMSC   SOUTHERN IRAN                

P: 29APR2021 133185    29.0N   58.0E 3.5-5.1 ABAAA  So. Iran/Persian Gulf      

 

O: 27APR2021 11:43:16  35.6N   89.6E mb=4.6  EMSC   WESTERN XIZANG               

P: 29APR2021 133254    36.0N   91.0E 3.8-5.4 AAAAA  Xizang                     

 

O: 27APR2021 22:07:06  54.5N  161.3E mb=4.2  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 26APR2021 133309    56.0N  163.0E 4.0-5.9 ABAAA  Komandorsky Isl            

 

O: 28APR2021 02:33:00  26.7N   92.5E mb=4.9  EMSC   ASSAM, INDIA

O: 28APR2021 02:43:21  26.7N   92.4E ML=4.0  EMSC   ASSAM, INDIA

O: 28APR2021 02:21:25  26.8N   92.4E Mw=6.0  EMSC   ASSAM, INDIA

O: 28APR2021 03:14:34  26.6N   92.5E ML=3.6  EMSC   ASSAM, INDIA

O: 28APR2021 05:09:12  26.6N   92.5E ML=3.4  EMSC   ASSAM, INDIA

O: 28APR2021 02:55:40  26.5N   92.5E ML=3.6  EMSC   ASSAM, INDIA                 

P: 23APR2021 133180    25.0N   95.0E 4.0-5.4 BBBAA  Myanmar                     

 

INDONESIA AND PHILIPPINES

 

O: 27APR2021 17:17:11   0.2S  122.9E ML=4.1  EMSC   SULAWESI, INDONESIA          

P: 27APR2021 133137     1.0S  122.0E 4.0-5.5 AAAAA  Sulawesi area              

 

O: 28APR2021 02:57:23   5.1S  132.0E mb=4.7  EMSC   BANDA SEA                    

P: 28APR2021 133142     6.0S  131.0E 4.0-5.6 AAAAA  West Irian, PNG            

 

O: 27APR2021 16:58:09   5.3N  126.5E mb=4.5  EMSC   MINDANAO, PHILIPPINES        

P: 28APR2021 133110     5.0N  125.0E 4.0-5.6 AABAA  Mindanao, Philippines      

 

O: 28APR2021 00:49:57   6.9S  127.7E ML=4.2  EMSC   BANDA SEA                    

P: 28APR2021 133114     7.0S  129.0E 4.0-5.5 AAAAA  Banda Sea                  

 

O: 27APR2021 09:23:39   7.5S  107.0E mb=4.9  EMSC   JAVA, INDONESIA               

P: 22APR2021 133133     8.0S  108.0E 4.0-5.4 BAAAA  So. of Java                

 

NEIC reported this earthquake of M 4.9 in Java, Indonesis was felt with intensity II-III in the area(s) of Java, Indonesia with intensity IV in Bogor, Pamulang and II-III in Cisaat, Cicuruk, Dayeuh, Bandung, Wengon and in Jakarta.

 

O: 27APR2021 16:51:24   7.7S  129.0E ML=4.4  EMSC   KEPULAUAN BARAT DAYA, INDONESI

P: 28APR2021 133114     7.0S  129.0E 4.0-5.5 AAAAA  Banda Sea                  

 

O: 27APR2021 13:30:37   9.2S  124.0E ML=4.0  EMSC   TIMOR REGION, INDONESIA      

P: 30APR2021 133343    10.0S  124.0E 4.0-5.5 BAAAA  Flores Island area         

 

O: 27APR2021 09:21:27   9.7S  117.5E ML=4.0  EMSC   SUMBAWA REGION, INDONESIA    

P: 21APR2021 133138     9.0S  118.0E 4.0-5.4 CAAAA  Sumbawa Island area        

 

O: 27APR2021 08:44:04  10.1N  126.5E ML=4.1  EMSC   PHILIPPINE ISLANDS REGION    

P: 24APR2021 133108     9.0N  127.0E 4.0-5.6 BBAAA  Halmahera                  

 

O: 27APR2021 17:47:42  19.1N  120.8E mb=4.5  EMSC   BABUYAN ISL REGION, PHILIPPINE

P: 29APR2021 133154    19.0N  120.0E 3.5-4.9 AAAAA  Luzon, Philippines         

 

O: 27APR2021 10:40:49   3.4S  145.5E mb=5.4  EMSC   NEAR N COAST OF NEW GUINEA, PNG.

O: 27APR2021 11:04:24   3.4S  145.6E Mw=5.3  EMSC   NEAR N COAST OF NEW GUINEA, PNG.

O: 27APR2021 08:03:49   3.6S  145.7E mb=5.1  EMSC   NEAR N COAST OF NEW GUINEA, PNG.

O: 27APR2021 15:01:11   4.0S  145.6E ML=4.6  EMSC   NEAR N COAST OF NEW GUINEA, PNG.

O: 27APR2021 08:05:32   3.4S  145.5E Mw=5.9  EMSC   NEAR N COAST OF NEW GUINEA, PN

O: 27APR2021 08:05:32   3.4S  145.5E Mw=6.1  ANSS   NEAR N COAST OF NEW GUINEA, PN

P: 27APR2021 133126     5.0S  146.0E 4.0-5.4 AAAAA  New Ireland                

 

O: 27APR2021 10:28:58   1.6S  134.3E ML=4.5  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O: 27APR2021 09:17:21   1.6S  134.4E ML=4.1  EMSC   NEAR N COAST OF PAPUA, INDONES

P: 27APR2021 133140     3.0S  134.0E 4.0-5.6 ABAAA  West Irian, PNG            

 

CENTRAL AND SOUTH AMERICA

 

O: 28APR2021 03:26:40   0.5S   61.6W mb=4.7  EMSC   AMAZONAS-RORAIMA BORDER, BRAZI

 

O: 27APR2021 13:04:30   8.8N   84.4W ML=4.6  EMSC   OFF COAST OF COSTA RICA      

P: 27APR2021 133103     8.0N   83.0W 3.5-5.4 AABAA  Costa Rica                 

 

O: 27APR2021 11:18:58  13.7S   74.7W ML=4.3  EMSC   CENTRAL PERU                 

P: 24APR2021 133341    14.0S   73.0W 4.0-5.4 BABAA  Central Peru               

 

O: 27APR2021 07:59:55  14.7N   92.4W ML=4.2  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 29APR2021 133146    14.0N   93.0W 3.5-5.2 AAAAA  Chiapas, Mexico            

 

O: 27APR2021 07:31:09  16.2N   97.5W ML=4.0  EMSC   OAXACA, MEXICO               

P: 23APR2021 133165    17.0N   98.0W 3.5-5.1 BAAAA  Oaxaca, Mexico             

 

O: 27APR2021 11:18:53  20.0S   69.3W ML=4.0  EMSC   TARAPACA, CHILE              

O: 27APR2021 11:18     20.0S   69.3W mb=4.0  GUC    Tarapaca at Alto Hospicio, Iqu

P: 29APR2021 133368    20.0S   71.0W 4.0-5.4 AABAA  So. Peru/Bolivia           

P: 25APR2021 133360    21.0S   69.0W 4.0-5.5 AAAAA  Coast No. Chile            

 

GUC reported this earthquake was felt with intensity III in  Tarapaca at Alto Hospicio, Iquique and Pozo Almonte II in Mamina and Pica, Chile.

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: 27APR2021 23:25:58  20.3N   70.0W ML=3.2  EMSC   DOMINICAN REPUBLIC REGION    

P: 29APR2021 133172    20.0N   71.0W 3.0-4.8 AAAAA  Bahamas/No. Caribbean      

 

O: 28APR2021 06:20:40  20.9S   68.9W mb=4.7  EMSC   TARAPACA, CHILE              

P: 25APR2021 133360    21.0S   69.0W 4.0-5.5 BAAAA  Coast No. Chile            

 

O: 28APR2021 02:23:22  24.0S   66.8W ML=4.1  EMSC   JUJUY, ARGENTINA             

P: 27APR2021 133358    24.0S   68.0W 4.0-5.6 AAAAA  Argentina                  

 

 

AFRICA AND EUROPE

 

O: 27APR2021 15:45:40  42.9N   17.8E ML=3.3  EMSC   BOSNIA AND HERZEGOVINA       

P: 26APR2021 133255    43.0N   18.0E 3.0-5.3 AAAAA  Adriatic Sea               

 

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

 

SOUTHWEST PACIFIC

 

O: 27APR2021 13:07:58  19.1S  167.6E mb=4.9  EMSC   VANUATU REGION               

P: 27APR2021 133356    19.0S  170.0E 4.0-5.4 AABAA  Vanuatu Islands            

 

O: 27APR2021 17:25:06  20.5S  177.6W mb=4.5  EMSC   FIJI REGION                  

P: 28APR2021 133369    21.0S  177.0W 4.0-5.7 AAAAA  Tonga Islands              

 

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

 

OCEAN RIDGES

 

O: 27APR2021 19:30:38  38.1S   17.2W mb=5.0  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 27APR2021 13:29:11  29.4S  176.7W mb=4.8  EMSC   KERMADEC ISLANDS REGION

O: 28APR2021 02:57:25  29.4S  176.6W mb=5.1  EMSC   KERMADEC ISLANDS REGION

O: 27APR2021 18:28:57  29.5S  176.7W mb=4.9  EMSC   KERMADEC ISLANDS REGION

O: 28APR2021 04:24:32  29.5S  176.7W mb=4.9  EMSC   KERMADEC ISLANDS REGION

O: 27APR2021 16:43:10  29.6S  176.7W mb=5.1  EMSC   KERMADEC ISLANDS REGION

O: 27APR2021 17:15:48  29.6S  176.7W mb=5.0  EMSC   KERMADEC ISLANDS REGION

O: 27APR2021 17:53:07  29.7S  176.9W Mw=5.3  EMSC   KERMADEC ISLANDS REGION

O: 27APR2021 23:14:40  30.1S  179.4E ML=4.3  EMSC   KERMADEC ISLANDS REGION

O: 27APR2021 16:33:33  29.1S  176.8W Mw=5.9  EMSC   KERMADEC ISLANDS REGION      

P: 26APR2021 133370    27.0S  176.0W 4.0-5.6 AAAAA  Tonga Islands              

P: 26APR2021 133362    29.0S  177.0W 4.0-5.7 AAAAA  Tonga Islands              

P: 30APR2021 133362    28.0S  176.0W 4.0-5.8 AAAAA  No. Kermadec Islands       

 

O: 27APR2021 08:31:31  34.9S  179.4E ML=3.9  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 25APR2021 133380    37.0S  178.0E 3.0-4.5 ACAAA  North Island, N.Z.         

 

O: 27APR2021 22:13:57  37.5S  179.9E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 23APR2021 133378    37.0S  180.0E 3.5-5.0 BAAAA  E. of North Islands N.Z.   

 

O: 27APR2021 17:03:57  37.6S  179.8W ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 28APR2021 133378    37.0S  179.0W 3.5-4.9 AAAAA  E. of North Islands N.Z.   

 

O: 27APR2021 07:48:37  38.3S  177.7E ML=3.8  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 25APR2021 133380    38.0S  178.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

O: 27APR2021 13:33:46  39.4S  177.2E ML=3.9  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 29APR2021 133381    39.0S  176.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

O: 28APR2021 05:03:38  40.1S  174.1E ML=4.0  EMSC   COOK STRAIT, NEW ZEALAND     

P: 25APR2021 133385    40.0S  175.0E 3.0-4.4 BAAAA  North Island, N.Z.         

 

 

JAPAN AND KURIL ISLANDS

 

O: 27APR2021 20:17:45  26.7N  141.5E mb=4.7  EMSC   BONIN ISLANDS, JAPAN REGION  

P: 28APR2021 133173    26.0N  143.0E 4.0-5.6 AAAAA  Bonin Islands              

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 28APR2021 02:24:52  32.6N  117.3W Ml=2.0  EMSC   CHANNEL ISLANDS REG., CALIFORN

P: 28APR2021 133232    32.9N  117.6W 2.5-4.4 AAAAA  So. California             

 

O: 27APR2021 15:05:07  32.8N  115.8W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P: 29APR2021 133231    32.4N  115.8W 2.5-4.5 AAAAA  So. California             

 

O: 27APR2021 09:50:35  33.5N  116.8W Ml=2.0  EMSC   SOUTHERN CALIFORNIA          

P: 25APR2021 133232    33.4N  116.7W 2.5-4.5 AAAAA  So. California             

 

O: 27APR2021 18:27:19  33.9N  118.4W Ml=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 27APR2021 19:36:08  33.9N  118.4W Ml=2.1  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 27APR2021 18:17:48  34.0N  118.4W Ml=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 27APR2021 16:38:12  33.9N  118.4W Ml=2.4  EMSC   GREATER LOS ANGELES AREA, CALI

P: 25APR2021 133234    33.9N  118.3W 2.5-4.8 AAAAA  So. California             

 

O: 27APR2021 21:34:42  36.0N  115.1W ml=2.1  EMSC   NEVADA                       

P: 24APR2021 133239    35.5N  116.4W 2.5-4.6 BABAA  So. California             

 

O: 27APR2021 17:47:22  36.0N  120.5W ML=2.5  EMSC   CENTRAL CALIFORNIA           

P: 27APR2021 133199    36.1N  120.1W 2.5-4.9 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.8 near Parkfield, California  was felt with intensity II-III in the area(s) of Central California at Dos Palos and Gustine.

 

O: 27APR2021 12:45:08  36.6N  121.3W Md=2.2  EMSC   CENTRAL CALIFORNIA           

P: 27APR2021 133200    36.8N  121.3W 2.5-4.7 AAAAA  Central California         

 

O: 27APR2021 19:00:03  37.4N  114.3W ml=2.1  EMSC   NEVADA                       

P: 23APR2021 133196    38.7N  115.4W 2.5-4.4 BBAAA  California/Nevada area     

 

O: 28APR2021 07:18:37  37.9N  122.2W Md=2.8  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 27APR2021 133201    38.0N  122.3W 2.5-4.7 AAAAA  Central California         

 

O: 28APR2021 01:30:27  38.2N  117.9W ML=2.9  EMSC   NEVADA                       

O: 27APR2021 13:07:52  38.2N  117.9W ml=2.1  EMSC   NEVADA                       

P: 25APR2021 133195    38.0N  118.0W 2.5-4.7 AAAAA  California/Nevada area     

 

O: 27APR2021 14:04:04  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P: 29APR2021 133202    38.7N  122.7W 2.5-4.5 AAAAA  Central California         

 

O: 28APR2021 00:32:35  39.1N  120.0W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P: 24APR2021 133197    39.3N  120.0W 2.5-4.6 BAAAA  California/Nevada area     

P: 26APR2021 133203    39.4N  120.5W 2.5-4.6 AAAAA  Central California         

 

 

ALASKA

 

O: 27APR2021 10:16:38  51.1N  179.7E mb=3.8  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 24APR2021 133314    51.0N  178.0E 4.0-5.8 AABAA  Rat Islands                

 

O: 27APR2021 12:45:11  54.6N  159.7W ml=3.7  EMSC   SOUTH OF ALASKA              

P: 29APR2021 133301    54.8N  158.7W 3.5-4.9 AAAAA  Alaska Peninsula           

 

O: 28APR2021 04:44:39  58.5N  136.8W ML=2.6  EMSC   SOUTHEASTERN ALASKA          

P: 26APR2021 133318    58.0N  139.0W 3.0-4.8 AABAA  Southeast Alaska           

 

O: 27APR2021 17:26:00  60.4N  147.7W mb=4.3  EMSC   SOUTHERN ALASKA              

P: 25APR2021 133323    61.2N  147.4W 3.2-5.0 AAAAA  Central Alaska             

 

O: 27APR2021 17:54:34  61.3N  150.0W Mw=4.7  EMSC   SOUTHERN ALASKA              

P: 27APR2021 133323    60.5N  148.5W 3.2-5.1 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: 28APR2021 01:50:41  31.1N  103.2W mb=2.8  EMSC   WESTERN TEXAS                

P: 26APR2021 133227    32.6N  103.6W 2.0-3.9 ABAAA  SW U.S.A                   

 

O: 27APR2021 13:21:18  31.7N  104.2W ML=3.0  EMSC   WESTERN TEXAS

O: 27APR2021 19:42:10  31.7N  104.4W ML=4.1  EMSC   WESTERN TEXAS

O: 28APR2021 02:10:42  31.7N  104.6W ML=3.4  EMSC   WESTERN TEXAS

O: 27APR2021 13:06:07  31.7N  104.2W ML=2.7  EMSC   WESTERN TEXAS                

P: 24APR2021 133227    32.6N  104.6W 2.0-3.9 BAAAA  SW U.S.A                   

 

O: 28APR2021 06:30:49  32.7N  100.7W mb=2.7  EMSC   WESTERN TEXAS

O: 28APR2021 05:51:10  32.7N  100.7W mb=2.9  EMSC   WESTERN TEXAS                

P: 26APR2021 133229    35.4N  101.8W 2.0-3.9 ACAAA  SW U.S.A                   

 

O: 27APR2021 09:07:52  44.8N  110.9W Ml=2.5  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 29APR2021 133299    44.6N  110.8W 2.0-4.2 AAAAA  Yellowstone/Wyoming        

 

EASTERN U.S./CANADA

 

O: 28APR2021 06:53:23  34.4N   97.4W ML=2.1  EMSC   OKLAHOMA

O: 27APR2021 10:37:01  34.4N   97.4W ML=2.1  EMSC   OKLAHOMA                     

P: 28APR2021 133245    34.0N   96.0W 2.0-4.3 AAAAA  Southern Plains            

 

O: 27APR2021 01:51:08  60.9N   59.2W MB=3.5  ECAN Resolution Island, NU          

P: 26APR2021 133322    65.0N   52.0W 2.5-4.3 ACCAA  Baffin/Davis Strait, Canada       

 

O: 26APR2021 08:46:11  50.0N   60.8W MB=2.1  ECAN La Romaine, QC                 

P: 28APR2021 133261    49.0N   66.0W 2.0-3.9 AACAA  E. of Maine                

 

HAWAII

 

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

 

SE

MODERATELY STRONG QUAKE IN NEW GUINEA WITH FULL MOON AND GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR  APRIL 26, 2021

 

The strongest earthquake in the world today was an M 5.7 in Papua New Guinea. It was reported with light intensity as far as Queensland, Australia.  This event occurred within minutes of local solar noon and an hour of the full moon in a region where which was expected to see maximum tidal stresses with this full moon. It was likely triggered by effects related to the full moon. This had been expected in the full moon forecast previously published in this summary as:

 

"The full moon will arrive on April 27, 2021 at 03:31 UT. Longitudes which are sub-solar (local solar noon) at this time are near 130 East Longitude while those near local solar midnight area near 50 West longitude. Those in the west include the Atlantic Ocean as far as the eastern Caribbean and the Shetland and South Sandwich Islands and in the east in western Japan, Taiwan, the Philippines and Central Indonesia. These areas may see enhanced seismicity within about 3 days of the full moon.

 

This may also be related to the minor geomagnetic storm currently active as this  epicenter lies on the geomagnetic equator where effects of such storms are at maximum. The previous issue of this summary had noted in this regard:

 

"The geomagnetic field saw active to minor storm conditions today. The AP level was 20.  High latitude geomagnetic field also saw stormy conditions with AP 40. This is a reemergence of  the strongest geomagnetic storm since AP reached 29 on March 20 and the strongest at high latitudes since AP reached 62 in polar areas on October 26, 2019. A major geomagnetic storm is expected around April 25-26. Enhanced seismicity is expected in late April near the geomagnetic equator and at high latitudes due to effects from this geomagnetic storm." (April 26, 2021)

 

Today's event was forecast within about 150 km of this epicenter to occur around April 27. An M 6.0 near this epicenter occurred on April 10, 2021. This may be an aftershock of that event. At the time this summary noted in this regard:

 

 

"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:

 

and

 

 

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 ...

 

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." (April 10, 2021)

 

O: 27APR2021 02:12:50   3.4S  145.5E Mw=5.7  EMSC   NEAR N COAST OF NEW GUINEA, PN

P: 27APR2021 133126     5.0S  146.0E 4.0-5.4 ABAAA  New Ireland                

 

The most active area of the world today was the northern Kermadec Islands. Moderately large event occurred in the area with M 5.5 and 5.7-5.8. These are aftershocks of the M 8.1 in the area that occurred on March 4, 2021. Earthquakes of M 5.0 and 5.5 in the sequence occurred near local solar midnight and local solar noon and may have been promoted by high tidal stresses associated with today's full moon. Forecast 133362 had expected today's activity withini about 50 km was likely around April 26.

 

O: 27APR2021 01:28:10  29.1S  178.4W mb=4.6  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 26APR2021 13:42:22  29.3S  177.6W mb=5.5  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 26APR2021 19:57:52  29.3S  176.5W mb=5.0  EMSC   KERMADEC ISLANDS REGION

O: 26APR2021 21:12:10  29.3S  176.6W mb=5.2  EMSC   KERMADEC ISLANDS REGION

O: 26APR2021 21:07:27  29.5S  176.7W Mw=5.8  EMSC   KERMADEC ISLANDS REGION

O: 26APR2021 21:07:27  29.5S  176.7W Mw=5.7  ANSS   KERMADEC ISLANDS REGION

O: 27APR2021 00:44:54  29.5S  176.8W mb=5.0  EMSC   KERMADEC ISLANDS REGION      

P: 26APR2021 133362    29.0S  177.0W 4.0-5.7 AAAAA  No. Kermadec Islands       

 

An earthquake of M 4.0 in the Virgin Islands today was felt with intensity III in San Juan, Puerto Rico. This event was probably promoted by the full moon as it occurred within minutes of the full moon and within minutes of local solar midnight. The area had been expected to see enhanced seismicity with this full moon (see above). The last earthquake to the east of this epicenter in the Virgin Islands was an M 4.4 on April 16, 2019. Forecast 133171 had expected today's event within about 50 km was likely around April 25.

 

O: 27APR2021 03:49:20  19.2N   63.7W ML=3.4  EMSC   VIRGIN ISLANDS REGION        

O: 27APR2021 03:49:22  19.4N   63.9W ML=4.0  ANSS   VIRGIN ISLANDS REGION        

P: 25APR2021 133171    20.0N   64.0W 3.0-4.4 AAAAA  Bahamas/No. Caribbean      

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 off the coast of Oregon, NEIC reported it may have been felt with light intensity in Oregon at Port Orford and Gresham. The last earthquake of larger magnitude within about 100 km of this epicenter was an 5.4 on August 15, 2019. Forecast 133282 had expected today's event was likely within about 10 km of this epicenter around April 29. This event occurred near local solar noon and may have been promoted by high tidal stresses which maximize near this hour.

 

O: 26APR2021 22:33:42  44.2N  128.9W mb=4.1  EMSC   OFF COAST OF OREGON          

P: 29APR2021 133282    44.1N  128.8W 3.0-4.7 BAAAA  Off Coast of Oregon        

 

The area of Hawaii was active today with two events of M 3.4 and M 3.6 west of the Loi'hi Seamount area south of Hawaii and northwest of Hawaii. This later event was preceded by an M 3.1 and occurred within about 30 minutes of local solar noon and was probably promoted by high tidal stresses associated with today's full moon. Forecast 133176 had expected this event was likely around April 28. Similar events of M>=3.6 within about 100 km of this epicenter occurred as an M 3.8 on February 23, 2021 and M 3.7 on May 7, 2020. Forecast 133176 had expected today's event in this region was likely around April 28. Today's earthquake was preceded earlier in the day by an M 3.4 foreshock. This had been noted in the previous issue of this summary as:

 

 

"NEIC reported the earthquake of M 3.4 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Kailua Kona. Hawaii is located at the seventh node (52 degrees) from the M 8.1 in the Kermadec Islands of March 4 and the M 7.7 in the Loyalty Islands of February 10 and may have been promoted by energy from those sources. " (April 25-26, 2021)

 

NEIC reported the earthquake of M 3.6 in Hawaii was felt with intensity II-III in the area(s) of Hawaii at Naalehu.

 

O: 26APR2021 22:57:19  19.8N  156.8W ML=3.1  EMSC   HAWAII REGION, HAWAII

O: 26APR2021 23:05:52  19.7N  156.8W ML=3.4  EMSC   HAWAII REGION, HAWAII        

O: 26APR2021 23:05:55  19.7N  156.8W ML=3.6  ANSS   HAWAII REGION, HAWAII        

P: 28APR2021 133176    20.1N  156.1W 4.0-5.8 AAAAA  Hawaii area                 

 

The earthquake south of Hawaii of M 3.4 was the strongest this far to the southwest of the big island since an M 3.9 on May 6, 2020. This was followed on May 12, 2020 by a series of events of M 3.4-3.8 about 75 km to the east. Forecast 133151 had expected activity in this area around April 25. NEIC reported this earthquake of M 3.4 off southern Hawaii  was felt with intensity II-III in the area(s) of Hawaii in Kamuela (IV), and II in Naaleu, Captain Cook, Kailua Kona.

 

O: 26APR2021 16:18:23  18.9N  155.9W ML=3.4  EMSC   HAWAII REGION, HAWAII        

P: 25APR2021 133151    18.8N  155.2W 3.0-4.7 AAAAA  Hawaii                     

 

Two moderate earthquakes hit the South Atlantic today. These were an M 5.3 in the South Sandwich Islands and an  M 5.0 in the South Shetland Islands. These events had been expected in the epicentral areas in forecasts 133394 and 133395. They may have been related to high tidal stresses with today's full moon or with the current geomagnetic storm which can trigger events at high latitudes.

 

O: 26APR2021 19:13:10  56.2S   27.5W Mw=5.3  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 27APR2021 133394    58.0S   26.0W 4.0-6.0 ABAAA  So. Sandwich Islands       

 

O: 27APR2021 00:00:01  62.4S   58.4W mb=5.0  EMSC   SOUTH SHETLAND ISLANDS       

P: 23APR2021 133395    62.0S   58.0W 3.0-5.4 BAAAA  So. So. America            

 

A pair of moderate aftershocks occurred in the region of Gabon, West Africa today. These are aftershocks of the M 5.2 and 5.4 in the area of March 6 and 9, 2021 and are the largest since those events occurred. They occurred near local solar midnight and may have been promoted by high tidal stresses with the full moon. The activity in Gabon is near 144 degrees from the M 8.1 in the Kermadec  Islands of March 5 and is probably promoted by energy from that source.

 

O: 27APR2021 00:38:57   1.1S   10.1E mb=4.5  EMSC   GABON

O: 27APR2021 00:40:56   1.1S   10.2E mb=4.7  EMSC   GABON                        

 

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: 26APR2021 15:49:06  25.5N  122.4E mb=4.1  EMSC   TAIWAN REGION                

P: 27APR2021 133187    24.0N  124.0E 4.0-5.6 ABBAA  Taiwan                     

 

O: 26APR2021 10:09:56  34.5N   46.0E mb=4.8  EMSC   WESTERN IRAN                 

P: 19APR2021 132949    36.0N   46.0E 3.8-5.3 CBAAA  No. Iran                   

 

O: 27APR2021 05:16:58  37.6N   75.7E mb=4.5  EMSC   SOUTHERN XINJIANG, CHINA     

P: 27APR2021 133210    38.0N   74.0E 3.8-5.6 AABAA  Hindu Kush/Pakistan        

 

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

 

INDONESIA AND PHILIPPINES

 

O: 27APR2021 01:38:46   0.3N   96.6E ML=4.0  EMSC   NIAS REGION, INDONESIA       

P: 22APR2021 133111     1.0N   97.0E 4.0-5.6 BAAAA  Nicobar Islands            

 

O: 26APR2021 10:38:42   0.7N  121.2E ML=4.0  EMSC   MINAHASA, SULAWESI, INDONESIA

P: 26APR2021 133098     1.0N  122.0E 4.0-5.4 AAAAA  Celebes Sea                

 

O: 27APR2021 00:16:20   1.6S  119.5E ML=4.0  EMSC   SULAWESI, INDONESIA          

P: 24APR2021 133137     1.0S  120.0E 4.0-5.4 BAAAA  Sulawesi area              

 

O: 26APR2021 15:11:44   2.4N   95.7E ML=4.0  EMSC   SIMEULUE, INDONESIA          

P: 27APR2021 133111     2.0N   95.0E 4.0-5.8 AAAAA  Nicobar Islands            

 

O: 26APR2021 13:21:03   2.5S   79.5W ML=4.0  EMSC   NEAR COAST OF ECUADOR        

P: 26APR2021 133120     2.0S   78.0W 4.0-5.4 AABAA  Ecuador                    

 

O: 27APR2021 02:12:50   3.4S  145.5E Mw=5.7  EMSC   NEAR N COAST OF NEW GUINEA, PN

P: 27APR2021 133126     5.0S  146.0E 4.0-5.4 ABAAA  New Ireland                

 

O: 26APR2021 15:11:17   7.1S  129.4E ML=4.6  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 28APR2021 133114     7.0S  129.0E 4.0-5.5 AAAAA  Banda Sea                  

 

O: 27APR2021 03:22:59   8.7S  110.3E ML=4.7  EMSC   JAVA, INDONESIA              

P: 28APR2021 133133     9.0S  109.0E 4.0-5.6 AAAAA  So. of Java                 

 

O: 27APR2021 03:40:01  14.3N  145.5E mb=5.0  EMSC   ROTA REGION, N. MARIANA ISLAND

P: 30APR2021 133168    14.0N  145.0E 4.0-5.4 BAAAA  So. Marianas/Guam          

 

NEIC reported this earthquake of M 5.0 in the Mariana Islands was felt with intensity II-III in the area(s) of the Mariana Islands in Rota, Dededo, Mongmong, Hagatha, and Piti, Guam.

 

 

CENTRAL AND SOUTH AMERICA

 

O: 26APR2021 19:54:15  15.7S   71.4W mb=4.8  EMSC   SOUTHERN PERU                

P: 28APR2021 133349    16.0S   72.0W 4.0-5.6 AAAAA  So. Peru/Bolivia           

 

NEIC reported this earthquake of M 4.8 in Southern Peru was felt with intensity II-III in the area(s) of Southern Peru at Chivay, Arequipa.

 

O: 26APR2021 20:30:39  18.2N   70.3W ML=3.2  EMSC   DOMINICAN REPUBLIC REGION    

P: 29APR2021 133172    20.0N   71.0W 3.0-4.8 BBAAA  Bahamas/No. Caribbean      

 

O: 27APR2021 05:24:42  19.0N   67.3W Md=3.4  EMSC   PUERTO RICO REGION           

P: 25APR2021 133172    20.0N   68.0W 3.0-4.7 AAAAA  Bahamas/No. Caribbean       

 

O: 27APR2021 03:49:20  19.2N   63.7W ML=3.4  EMSC   VIRGIN ISLANDS REGION        

P: 25APR2021 133171    20.0N   64.0W 3.0-4.4 AAAAA  Bahamas/No. Caribbean      

 

O: 26APR2021 08:43:24  27.4N  111.3W ML=3.7  EMSC   GULF OF CALIFORNIA           

P: 30APR2021 133175    28.0N  112.0W 3.5-5.0 BAAAA  Gulf of California         

 

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

 

AFRICA AND EUROPE

 

O: 27APR2021 00:38:57   1.1S   10.1E mb=4.5  EMSC   GABON

O: 27APR2021 00:40:56   1.1S   10.2E mb=4.7  EMSC   GABON                        

 

O: 26APR2021 19:58:35  36.5N   27.2E ML=4.1  EMSC   DODECANESE IS.-TURKEY BORDER R

O: 26APR2021 19:21:03  37.8N   27.0E ML=4.0  EMSC   DODECANESE ISLANDS, GREECE   

P: 25APR2021 133248    37.0N   28.0E 3.5-5.0 AAAAA  Turkey                     

 

SOUTHWEST PACIFIC

 

O: 26APR2021 15:07:42  14.9S  167.4E mb=4.6  EMSC   VANUATU                      

P: 25APR2021 133356    15.0S  168.0E 4.0-5.6 AAAAA  Vanuatu Islands            

 

O: 27APR2021 00:23:07  19.9S  177.7W mb=4.4  EMSC   FIJI REGION                  

P: 27APR2021 133354    19.0S  176.0W 4.0-5.8 AABAA  Tonga Islands              

P: 28APR2021 133369    21.0S  177.0W 4.0-5.7 BAAAA  Tonga Islands              

P: 29APR2021 133369    20.0S  176.0W 4.0-5.8 AABAA  Tonga Islands              

 

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

 

OCEAN RIDGES

 

O: 26APR2021 19:13:10  56.2S   27.5W Mw=5.3  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 27APR2021 133394    58.0S   26.0W 4.0-6.0 ABAAA  So. Sandwich Islands       

 

O: 27APR2021 00:00:01  62.4S   58.4W mb=5.0  EMSC   SOUTH SHETLAND ISLANDS       

P: 23APR2021 133395    62.0S   58.0W 3.0-5.4 BAAAA  So. So. America            

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 27APR2021 01:28:10  29.1S  178.4W mb=4.6  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 26APR2021 13:42:22  29.3S  177.6W mb=5.5  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 26APR2021 19:57:52  29.3S  176.5W mb=5.0  EMSC   KERMADEC ISLANDS REGION

O: 26APR2021 21:12:10  29.3S  176.6W mb=5.2  EMSC   KERMADEC ISLANDS REGION

O: 26APR2021 21:07:27  29.5S  176.7W Mw=5.8  EMSC   KERMADEC ISLANDS REGION

O: 27APR2021 00:52:57  32.9S  179.5E ML=4.1  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 25APR2021 133380    37.0S  178.0E 3.0-4.5 ACBAA  North Island, N.Z.         

 

O: 27APR2021 00:44:54  29.5S  176.8W mb=5.0  EMSC   KERMADEC ISLANDS REGION      

P: 26APR2021 133362    29.0S  177.0W 4.0-5.7 AAAAA  No. Kermadec Islands       

 

O: 26APR2021 13:12:35  44.4S  168.2E ML=3.5  EMSC   SOUTH ISLAND OF NEW ZEALAND  

P: 22APR2021 133389    45.0S  168.0E 3.0-4.9 BAAAA  So. Island, N.Z.           

P: 28APR2021 133389    46.0S  167.0E 3.0-5.0 ABAAA  Southern S. Isl. N.Z.      

 

JAPAN AND KURIL ISLANDS

 

O: 26APR2021 11:12:04  34.8N  141.8E mb=4.3  EMSC   OFF EAST COAST OF HONSHU, JAPA

P: 24APR2021 133223    34.0N  141.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 26APR2021 08:09:17  33.2N  115.7W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P: 27APR2021 133231    32.8N  116.0W 2.5-4.4 AAAAA  So. California             

 

O: 26APR2021 20:09:13  33.4N  118.5W Ml=2.4  EMSC   CHANNEL ISLANDS, CALIFORNIA  

P: 25APR2021 133234    33.9N  118.3W 2.5-4.8 AAAAA  So. California             

 

O: 26APR2021 17:28:13  33.5N  116.8W Ml=2.0  EMSC   SOUTHERN CALIFORNIA          

P: 25APR2021 133232    33.4N  116.7W 2.5-4.5 AAAAA  So. California             

 

O: 26APR2021 08:20:09  35.7N  117.5W Ml=2.5  EMSC   SOUTHERN CALIFORNIA          

P: 25APR2021 133239    35.9N  117.7W 2.5-5.2 AAAAA  So. California             

 

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

 

O: 26APR2021 21:40:23  36.6N  118.0W Ml=2.4  EMSC   CENTRAL CALIFORNIA           

P: 27APR2021 133192    36.1N  118.1W 2.5-5.1 AAAAA  California/Nevada area     

 

O: 26APR2021 08:27:20  37.6N  119.4W Md=2.2  EMSC   CENTRAL CALIFORNIA           

P: 23APR2021 133194    37.3N  119.4W 2.5-4.8 BAAAA  California/Nevada area     

 

O: 26APR2021 11:44:33  37.9N  122.2W Md=2.6  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 27APR2021 133201    38.0N  122.3W 2.5-4.7 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.6 in the San Francisco Bay, California was felt with intensity II-III in the area(s) of the San Francisco Bay, California at Oakland, Berkeley, and Orinda among others.

 

O: 26APR2021 09:53:26  39.1N  120.0W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 26APR2021 12:37:11  39.1N  120.0W ML=3.2  EMSC   NORTHERN CALIFORNIA

O: 26APR2021 12:44:47  39.1N  120.0W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 26APR2021 12:47:46  39.1N  120.0W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 26APR2021 14:13:30  39.1N  120.0W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 26APR2021 09:51:16  39.1N  120.0W Md=2.4  EMSC   NORTHERN CALIFORNIA          

P: 24APR2021 133197    39.3N  120.0W 2.5-4.6 AAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 3.2 near Tahoe, California  was felt with intensity II-III in the area(s) near Tahoe, California in Tahoma, Carnelian Bay, Tahoe Vista, Tahoe City, Homewood, Kings Beach, South Lake Tahoe and in Nevada at Glenbrook, Carson City, and Incline Village.

 

O: 26APR2021 11:54:46  39.7N  123.4W Md=2.3  EMSC   NORTHERN CALIFORNIA

O: 26APR2021 12:18:34  39.7N  123.5W Md=2.7  EMSC   NORTHERN CALIFORNIA          

P: 23APR2021 133204    39.8N  123.5W 2.5-4.4 BAAAA  Central California         

 

NEIC reported this earthquake of M 2.7 in Laytonville, California was felt with intensity II-III in the area(s) of Laytonville, California.

 

 

ALASKA

 

O: 27APR2021 02:32:12  57.9N  156.0W ML=3.7  EMSC   ALASKA PENINSULA             

P: 24APR2021 133301    55.7N  156.9W 3.5-5.1 BCAAA  Alaska Peninsula            

 

O: 26APR2021 21:59:41  58.2N  151.5W ML=3.4  EMSC   KODIAK ISLAND REGION, ALASKA 

O: 26APR2021 12:55:05  60.2N  153.2W ml=3.4  EMSC   SOUTHERN ALASKA              

P: 21APR2021 133325    60.8N  151.7W 3.2-4.9 BAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 26APR2021 09:12:41  48.6N  121.9W Ml=2.0  EMSC   WASHINGTON

O: 26APR2021 07:50:47  48.6N  121.9W Ml=2.8  EMSC   WASHINGTON                   

P: 27APR2021 133297    48.4N  123.2W 2.0-4.2 AAAAA  Washington state, U.S.     

P: 28APR2021 133295    47.5N  121.8W 2.0-4.2 ABAAA  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 in Sedro Wooley, Mount Vernon, Concrete, Bellingham, Blaine, Lynnwood, Seattle, and Shelton and possibly in Vancouver, British Columbia, Canada.

 

O: 26APR2021 22:33:42  44.2N  128.9W mb=4.1  EMSC   OFF COAST OF OREGON          

P: 29APR2021 133282    44.1N  128.8W 3.0-4.7 BAAAA  Off Coast of Oregon        

 

ROCKY MOUNTAINS REGION

 

O: 26APR2021 22:40:36  31.7N  104.3W ML=2.9  EMSC   WESTERN TEXAS                

O: 26APR2021 22:46:49  31.7N  104.3W ML=3.2  EMSC   WESTERN TEXAS                

P: 24APR2021 133227    32.6N  104.6W 2.0-3.9 AAAAA  SW U.S.A                   

 

O: 26APR2021 18:58:04  44.2N  110.3W Ml=2.1  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 24APR2021 133299    44.2N  110.3W 2.0-4.2 AAAAA  Yellowstone/Wyoming        

 

O: 26APR2021 07:43:00  44.5N  115.2W Ml=2.6  EMSC   SOUTHERN IDAHO

O: 26APR2021 20:42:08  44.3N  115.1W Ml=2.6  EMSC   SOUTHERN IDAHO               

P: 28APR2021 133269    44.4N  115.2W 2.0-4.1 AAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 23APR2021 13:02:34  49.2N   67.0W MB=2.4  ECAN Cap-Chat, QC                    

P: 28APR2021 133261    49.0N   66.0W 2.0-3.9 BAAAA  E. of Maine                

 

O: 23APR2021 13:12:23  47.3N   70.4W MB=1.4  ECAN Charlevoix Seismic Zone        

O: 22APR2021 23:38:44  47.7N   69.7W MB=1.5  ECAN Charlevoix Seismic Zone        

P: 26APR2021 133274    47.3N   70.5W 2.0-3.9 AAAAA  New England                

 

HAWAII

 

 

O: 26APR2021 16:18:23  18.9N  155.9W ML=3.4  EMSC   HAWAII REGION, HAWAII        

P: 25APR2021 133151    18.8N  155.2W 3.0-4.7 AAAAA  Hawaii                      

 

O: 26APR2021 14:11:12  19.2N  155.4W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 26APR2021 14:11:12  19.2N  155.4W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 25APR2021 133151    18.8N  155.2W 3.0-4.7 AAAAA  Hawaii                     

 

O: 26APR2021 22:57:19  19.8N  156.8W ML=3.1  EMSC   HAWAII REGION, HAWAII

O: 26APR2021 23:05:52  19.7N  156.8W ML=3.4  EMSC   HAWAII REGION, HAWAII        

P: 28APR2021 133176    20.1N  156.1W 4.0-5.8 AAAAA  Hawaii area                

 

 

COND STRONG EARTHQUAKE IN TONGA SIMILAR TO THAT OF APRIL 23

 

EARTHQUAKE SUMMARY FOR  APRIL 25, 2021

 

The strongest earthquake in the world today was an M 6.4-6.5 in central Tonga. NEIC reported it may have been felt as far to the north as Samoa with intensity III. This event is similar in many ways to the M 6.5 in Tonga which occurred two days ago and was reported at the time in this summary as:

 

"The strongest earthquake in the world today was an M 6.5  in Central Tonga. NEIC reported it was felt with intensity VI in Tofoa-Koloua, Tonga  and II in Neiafu, Vavau, Tonga. The last earthquake with M>=6.5 in the world was an M 6.6 on April 3, 2021 in the South Atlantic. The only other event of this magnitude or greater in the world in the past month was an M 6.5 aftershock in the Kermadec Islands on April 1, 2021. This earthquake occurred near local solar noon in an area near the regional geomagnetic equator. It was preceded about an hour earlier by an M 5.3 about 150 km to the south, an earthquake which occurred within about 30 minutes of local solar noon. It was probably promoted effects from the strong geomagnetic storm and solar flares of the past several days which maximize near this hour. The M 6.5 is the strongest earthquake within about 250 km of this epicenter since an M 6.6 on November 4, 2019. Forecasts 133354 had expected this event within about 50 km was likely around April 27. The M 5.3 to the south had been expected within about 100 km around April 28 in forecast 133369. The M 6.5 is at 103 degrees from the M 6.6 in the South Atlantic of April 3 and was probably promoted by strong energy concentration associated with that earthquake at this distance." (April 23-24, 2021)

 

Today's event is near the position of the M 5.3 on April 23 and that may have been a foreshock to today's earthquake. The parameters of that foreshock were:

 

O: 23APR2021 23:11:56  20.5S  177.7W Mw=5.3  EMSC   FIJI REGION                  

 

Note that this event was near local solar noon just as today's quake was  and both may have been promoted by high tidal stresses associated with the full moon of April 27. The last earthquake of M>=6.5 within about 200 km of today's epicenter was an M 6.6 on May 27, 2016 and an M 6.4 on May w7, 2016. These two earthquakes were similar to the two in the past three days with the first about 200 km north of the second and one day apart in time.  Forecast 133369 had expected today's event within about 100 km was likely around April 28.

 

O: 25APR2021 22:28:01  21.7S  177.1W Mw=6.5  EMSC   FIJI REGION                  

P: 28APR2021 133369    21.0S  177.0W 4.0-5.7 BAAAA  Tonga Islands              

 

An M 5.4 also occurred in southern Peru on the geomagnetic equator. NEIC reported it was felt with maximum intensity IV in Peru at Acary and II-III in Nazca, Ica and San Luis, Lima. The last earthquake within about 200 km of today's epicenter of M>=5.4 occurred on January 20, 2021 with M 5.5. These are probably aftershocks of an M 7.1 within about 50 km of today's epicenter which occurred on January 14, 2018. Forecasts 133341 and 133349 had expected today's activity in the area was likely around April 28.

 

O: 25APR2021 23:50:34  15.6S   74.5W Mw=5.4  EMSC   NEAR COAST OF SOUTHERN PERU  

P: 24APR2021 133341    14.0S   73.0W 4.0-5.4 ABBAA  Central Peru                

P: 28APR2021 133349    16.0S   72.0W 4.0-5.6 BABAA  So. Peru/Bolivia           

 

A moderate earthquake of M 3.7 was widely felt in the area of Reno, Nevada near the California-Nevada border. NEIC reported it was felt with intensity IV in Tahoe City, Olympic Valley, Homewood, Kings Beach and III in Tahoe Vista, Tahoma, Carnelian Bay and in Nevada with II-III in Carson City, Glenbrook.   This is the strongest earthquake in this region within about 100 km since an M 4.5 in Nevada about 50 km to the east of today's epicenter. An M 3.7-3.8 also  occurred about 100 km east of this on December 12, 2020. Forecast 133197 had expected today's quake within about 25 km was likely around April 24. This epicenter is at the fourth node (90 degrees) from the M 7.7 in the Loyalty Islands of February 10 and at the fifth node (72 degrees) from the recent major earthquakes off eastern Honshu, Japan of March 20 and may have been promoted by energy from those sources.

 

O: 25APR2021 15:35:48  39.1N  120.0W ML=2.4  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 15:40:03  39.1N  120.0W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 15:44:58  39.1N  120.0W ML=2.7  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 15:54:52  39.1N  120.0W Md=2.5  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 16:35:23  39.1N  120.0W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 17:08:39  39.1N  120.0W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 17:32:24  39.1N  120.0W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 18:18:40  39.1N  120.0W Md=2.5  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 15:33:22  39.1N  120.0W Mw=3.7  EMSC   NORTHERN CALIFORNIA          

P: 24APR2021 133197    39.3N  120.0W 2.5-4.6 AAAAA  California/Nevada area     

 

Light to moderate earthquakes also occurred in several other areas of the U.S. today. These included an M 3.5 in Southern Idaho, an M 3.7 in Baja California, Mexico; an M 3.4 in Hawaii.  NEIC reported the earthquake of M 3.5 in Southern Idaho was felt with intensity II-III in the area(s) of Southern Idaho in Stanley.

 

O: 25APR2021 10:23:21  44.2N  115.0W ML=3.5  EMSC   SOUTHERN IDAHO               

P: 24APR2021 133269    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

NEIC reported the earthquake of M 3.7 in Baja California was felt with intensity II-III in the area(s) of California at Spring Valley and El Cajon.

 

O: 26APR2021 05:12:05  31.5N  115.6W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO      

P: 27APR2021 133230    31.9N  116.3W 2.5-4.4 AAAAA  So. California             

 

NEIC reported the earthquake of M 3.4 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Kailua Kona.  Hawaii is located at the seventh node (52 degrees) from the M 8.1 in the Kermadec Islands of March 4 and the M 7.7 in the Loyalty Islands of February 10 and may have been promoted by energy from those sources.

 

O: 26APR2021 03:26:52  19.8N  156.8W ML=3.4  EMSC   HAWAII REGION, HAWAII        

P: 28APR2021 133176    20.1N  156.1W 4.0-5.8 AAAAA  Hawaii area                

 

An earthquake of M 4.9 in the northern Mid-Atlantic Ridge area today continued regionally enhanced seismicity in the area of the past several days. This event occurred near local solar noon and was probably enhanced by  the full moon of April 27 as noted in previous issues of this summary:

 

The full moon will arrive on April 27, 2021 at 03:31 UT. Longitudes which are sub-solar (local solar noon) at this time are near 130 East Longitude while those near local solar midnight area near 50 West longitude. Those in the west include the Atlantic Ocean as far as the eastern Caribbean and the Shetland and South Sandwich Islands and in the east in western Japan, Taiwan, the Philippines and Central Indonesia. These areas may see enhanced seismicity within about 3 days of the full moon.

 

The forecast had placed the maximum stress longitude near this event in the  Northern Mid-Atlantic. The last earthquake of M>=4.9 in this area was an M 4.9 on November 15, 2020 but the last of larger magnitude was an M 5.0 on April 8, 2018. Forecast 133150 had expected today's event within about 50 km of this epicenter was likely around April 26. This epicenter is at 144 degrees from the Loyalty Islands where an M 7.7 hit on February 10 and may have been promoted by energy from that source.

 

O: 25APR2021 12:29:28  17.2N   46.4W mb=4.9  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 26APR2021 133158    17.0N   47.0W 4.0-5.7 AAAAA  Mid-Atlantic 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: 25APR2021 20:05:23  38.3N   73.2E mb=4.3  EMSC   TAJIKISTAN                   

P: 27APR2021 133210    38.0N   74.0E 3.8-5.6 AAAAA  Hindu Kush/Pakistan        

 

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

 

INDONESIA AND PHILIPPINES

 

O: 25APR2021 15:18:25   1.5S  134.4E ML=4.1  EMSC   NEAR N COAST OF PAPUA, INDONES

P: 27APR2021 133140     3.0S  134.0E 4.0-5.6 AAAAA  West Irian, PNG            

 

O: 26APR2021 05:23:48   2.1S  128.0E ML=4.3  EMSC   CERAM SEA, INDONESIA         

P: 27APR2021 133118     4.0S  128.0E 4.0-5.4 ABAAA  Ceram area                 

 

O: 25APR2021 21:21:16   7.8N  126.1E mb=4.2  EMSC   MINDANAO, PHILIPPINES        

P: 24APR2021 133108     9.0N  127.0E 4.0-5.6 ABAAA  Halmahera                  

P: 30APR2021 133101     7.0N  126.0E 4.0-5.6 BAAAA  Central Philippines        

 

O: 25APR2021 18:34:28   8.2S  120.6E mb=4.8  EMSC   FLORES REGION, INDONESIA     

P: 29APR2021 133121     8.0S  121.0E 4.0-5.5 BAAAA  Flores Island area         

 

O: 25APR2021 16:39:37   8.3S  116.0E ML=4.1  EMSC   LOMBOK REGION, INDONESIA     

P: 21APR2021 133138     9.0S  118.0E 4.0-5.4 BAAAA  Sumbawa Island area        

 

O: 25APR2021 15:08:33  10.0S  118.8E ML=4.0  EMSC   SUMBAWA REGION, INDONESIA    

P: 23APR2021 133351    11.0S  119.0E 4.0-5.6 AAAAA  So. of Indonesia           

 

O: 25APR2021 10:06:17  17.5N  145.5E mb=4.5  EMSC   ALAMAGAN REG, N. MARIANA ISLAN

P: 24APR2021 133161    16.0N  145.0E 4.0-5.4 ABAAA  No. Marianas               

P: 29APR2021 133161    17.0N  147.0E 4.0-5.4 BABAA  No. Marianas               

 

 

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

 

CENTRAL AND SOUTH AMERICA

 

O: 25APR2021 14:48:04  14.1N   91.2W mb=4.2  EMSC   GUATEMALA                    

P: 26APR2021 133150    15.0N   92.0W 3.5-5.4 AAAAA  Guatemala                  

 

O: 25APR2021 10:02:14  14.3N   93.9W mb=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

O: 25APR2021 09:02:47  14.3N   94.0W ML=4.2  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 28APR2021 133146    14.0N   94.0W 3.5-5.5 BAAAA  Chiapas, Mexico            

 

O: 25APR2021 23:50:34  15.6S   74.5W Mw=5.4  EMSC   NEAR COAST OF SOUTHERN PERU  

P: 24APR2021 133341    14.0S   73.0W 4.0-5.4 ABBAA  Central Peru               

P: 28APR2021 133349    16.0S   72.0W 4.0-5.6 BABAA  So. Peru/Bolivia           

 

O: 26APR2021 04:56:20  17.4N   94.7W ML=4.1  EMSC   VERACRUZ, MEXICO             

P: 25APR2021 133147    17.0N   94.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 25APR2021 12:56:20  17.4S   69.9W mb=4.3  EMSC   SOUTHERN PERU                

P: 22APR2021 133349    17.0S   69.0W 4.0-5.8 BAAAA  So. Peru/Bolivia           

 

O: 25APR2021 15:56:27  19.7N   68.8W Md=3.8  EMSC   DOMINICAN REPUBLIC REGION    

P: 25APR2021 133172    20.0N   68.0W 3.0-4.7 AAAAA  Bahamas/No. Caribbean      

 

O: 25APR2021 21:30:46  19.7S   70.1W mb=4.3  EMSC   TARAPACA, CHILE              

P: 23APR2021 133368    20.0S   69.0W 4.0-5.4 AAAAA  So. Peru/Bolivia           

 

NEIC reported this earthquake of M 4.3 in Tarapaca, Chile was felt with intensity II-III in the area(s) of Tarapaca, Chile at Iquique.

 

O: 25APR2021 08:22:59  20.2N   70.8W ML=3.0  EMSC   DOMINICAN REPUBLIC REGION    

P: 29APR2021 133172    20.0N   71.0W 3.0-4.8 BAAAA  Bahamas/No. Caribbean      

 

O: 26APR2021 00:17:06  23.4S   66.8W mb=4.2  EMSC   JUJUY, ARGENTINA             

P: 27APR2021 133358    24.0S   68.0W 4.0-5.6 AAAAA  Argentina                  

 

O: 25APR2021 20:42:02  24.4S   64.9W ML=4.3  EMSC   JUJUY, ARGENTINA             

P: 26APR2021 133358    24.0S   64.0W 4.0-5.9 AAAAA  Argentina                  

 

 

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

 

AFRICA AND EUROPE

 

O: 26APR2021 01:02:31  43.2N   47.0E ML=4.1  EMSC   CAUCASUS REGION, RUSSIA      

P: 29APR2021 133259    43.0N   44.0E 3.5-4.9 BABAA  Caucasus/Caspian Sea       

 

O: 26APR2021 03:01:02  36.5N   11.6W mb=4.0  EMSC   AZORES-CAPE ST. VINCENT RIDGE

P: 26APR2021 133216    39.0N    8.0W 3.5-5.2 ACCAA  Morocco/Spain              

 

O: 25APR2021 15:07:18  37.0N    5.3E mb=3.9  EMSC   NORTHERN ALGERIA             

P: 26APR2021 133253    37.0N    3.0E 3.0-4.5 AABAA  Western Mediterranean      

 

O: 25APR2021 09:39:07  38.2N   42.5E ML=4.0  EMSC   EASTERN TURKEY               

O: 25APR2021 09:20:17  38.3N   42.5E ML=3.9  EMSC   EASTERN TURKEY               

P: 23APR2021 133250    39.0N   41.0E 3.5-5.4 AAAAA  Turkey                     

P: 29APR2021 133250    38.0N   43.0E 3.5-5.3 BAAAA  Turkey                     

 

SOUTHWEST PACIFIC

 

O: 25APR2021 21:07:09  14.9S  173.4W mb=4.7  EMSC   SAMOA ISLANDS REGION         

P: 23APR2021 133346    15.0S  175.0W 4.0-5.6 AABAA  Samoa Islands              

 

O: 25APR2021 22:28:01  21.7S  177.1W Mw=6.5  EMSC   FIJI REGION                  

P: 28APR2021 133369    21.0S  177.0W 4.0-5.7 BAAAA  Tonga Islands              

 

O: 26APR2021 02:18:08  23.2S  171.9E mb=5.2  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 28APR2021 133361    22.0S  172.0E 4.0-5.6 ABAAA  Loyalty Islands            

 

OCEAN RIDGES

 

O: 25APR2021 12:29:28  17.2N   46.4W mb=4.9  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 26APR2021 133158    17.0N   47.0W 4.0-5.7 AAAAA  Mid-Atlantic Ridge         

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 26APR2021 01:35:02  35.2S  178.7E ML=3.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 25APR2021 18:19:38  36.0S  177.9E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 25APR2021 19:57:07  36.3S  178.1E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 28APR2021 133378    37.0S  179.0W 3.5-4.9 AABAA  E. of North Islands N.Z.   

P: 23APR2021 133378    37.0S  180.0E 3.5-5.0 AAAAA  E. of North Islands N.Z.   

 

O: 26APR2021 06:23:45  37.7S  179.7E ML=3.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 28APR2021 133378    37.0S  179.0W 3.5-4.9 AAAAA  E. of North Islands N.Z.   

P: 25APR2021 133380    38.0S  178.0E 3.0-4.6 AABAA  North Island, N.Z.         

 

O: 25APR2021 22:35:02  39.0S  176.3E ML=4.4  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 25APR2021 133385    40.0S  175.0E 3.0-4.4 AAAAA  North Island, N.Z.         

P: 29APR2021 133381    39.0S  176.0E 3.0-4.6 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: 25APR2021 15:35:48  39.1N  120.0W ML=2.4  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 15:40:03  39.1N  120.0W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 15:44:58  39.1N  120.0W ML=2.7  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 15:54:52  39.1N  120.0W Md=2.5  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 16:35:23  39.1N  120.0W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 17:08:39  39.1N  120.0W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 17:32:24  39.1N  120.0W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 18:18:40  39.1N  120.0W Md=2.5  EMSC   NORTHERN CALIFORNIA

O: 25APR2021 15:33:22  39.1N  120.0W Mw=3.7  EMSC   NORTHERN CALIFORNIA          

P: 24APR2021 133197    39.3N  120.0W 2.5-4.6 AAAAA  California/Nevada area     

 

O: 26APR2021 05:12:05  31.5N  115.6W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO      

P: 27APR2021 133230    31.9N  116.3W 2.5-4.4 AAAAA  So. California              

 

O: 25APR2021 09:29:39  33.5N  116.8W Ml=2.0  EMSC   SOUTHERN CALIFORNIA          

P: 25APR2021 133232    33.4N  116.7W 2.5-4.5 AAAAA  So. California             

 

O: 26APR2021 02:25:20  34.2N  117.1W Ml=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 26APR2021 133233    34.3N  117.5W 2.5-4.9 AAAAA  So. California             

 

O: 26APR2021 05:50:54  36.4N  120.3W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P: 26APR2021 133199    36.2N  120.8W 2.5-4.5 AAAAA  Central California         

P: 27APR2021 133199    36.1N  120.1W 2.5-4.9 AAAAA  Central California         

 

O: 26APR2021 02:19:42  36.6N  121.2W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P: 27APR2021 133200    36.8N  121.3W 2.5-4.7 AAAAA  Central California         

 

O: 25APR2021 17:04:53  38.2N  117.8W ml=2.2  EMSC   NEVADA                       

P: 25APR2021 133195    38.0N  118.0W 2.5-4.7 AAAAA  California/Nevada area     

 

O: 25APR2021 08:26:16  38.8N  122.8W Md=2.3  EMSC   NORTHERN CALIFORNIA

O: 26APR2021 04:05:56  38.7N  122.6W ML=2.7  EMSC   NORTHERN CALIFORNIA          

O: 26APR2021 04:05:56  38.7N  122.6W ML=3.3  ANSS   NORTHERN CALIFORNIA          

P: 27APR2021 133202    38.5N  122.7W 2.5-4.6 AAAAA  Central California         

 

NEIC reported this earthquake of M 3.3 in the California Geysers was felt with intensity II-III in the area(s) of the California Geysers in Middletown (IV), Healdsburg, Kelseyville.

 

O: 25APR2021 22:39:40  40.9N  122.2W Md=2.6  EMSC   NORTHERN CALIFORNIA          

P: 22APR2021 133278    40.6N  122.4W 2.5-4.4 BAAAA  Northern California        

 

 

ALASKA

 

O: 25APR2021 08:21:37  62.2N  145.6W ML=3.4  EMSC   CENTRAL ALASKA               

P: 25APR2021 133323    61.2N  147.4W 3.2-5.0 AAAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.2 in Central Alaska was felt with intensity II-III in the area(s) of Central Alaska in Glenallen.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 25APR2021 14:31:01  47.6N  122.5W Md=2.3  EMSC   SEATTLE-TACOMA AREA, WASHINGTO

P: 27APR2021 133295    46.9N  122.0W 2.0-4.1 AAAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O: 25APR2021 12:29:54  37.8N  113.0W ML=3.0  EMSC   UTAH                         

P: 24APR2021 133251    38.3N  112.2W 2.0-3.9 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 with IV at Summit and in Cedar City, Parowan.

 

O: 25APR2021 11:09:15  44.2N  115.0W Ml=2.6  EMSC   SOUTHERN IDAHO

O: 25APR2021 09:42:39  44.3N  115.0W ML=2.7  EMSC   SOUTHERN IDAHO

O: 26APR2021 03:13:36  44.4N  114.7W ML=2.6  EMSC   SOUTHERN IDAHO

O: 25APR2021 10:23:21  44.2N  115.0W ML=3.5  EMSC   SOUTHERN IDAHO               

P: 24APR2021 133269    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 25APR2021 17:33:23  35.1N   95.4W ML=2.1  EMSC   OKLAHOMA                     

O: 26APR2021 02:41:11  35.1N   95.4W ML=2.1  EMSC   OKLAHOMA                     

P: 29APR2021 133246    35.0N   96.0W 2.0-4.1 BAAAA  Southern Plains            

 

O: 25APR2021 10:30:30  36.4N   97.3W ML=2.1  EMSC   OKLAHOMA                     

P: 30APR2021 133246    36.0N   97.0W 2.0-4.4 BAAAA  Southern Plains            

 

HAWAII

 

O: 26APR2021 01:56:35  19.3N  155.4W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 26APR2021 05:55:14  19.3N  155.4W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 25APR2021 21:16:15  19.5N  155.7W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

P: 25APR2021 133151    18.8N  155.2W 3.0-4.7 AAAAA  Hawaii                     

 

O: 26APR2021 03:26:52  19.8N  156.8W ML=3.4  EMSC   HAWAII REGION, HAWAII        

P: 28APR2021 133176    20.1N  156.1W 4.0-5.8 AAAAA  Hawaii area