STRONG EARTHQUAKE IN NEW GUINEA PROMOTED BY TIDAL STRESSES
EARTHQUAKE SUMMARY FOR APRIL 10, 2021
The strongest earthquake in the world today was an M 6.0-6.1 off the north coast of New Guinea. NEIC reported it was felt in Papua New Guinea with intensity II-III at Madang and Mount Hagen. It was probably promoted by high tidal stresses associated with the New Moon of April 12 as noted in previous issues of this report maximize near this longitude:
"The new moon will arrive on April 12 at 02:31 UT. Longitudes which are near local solar midnight at this time are near 37 West and those at local solar noon are near 143 East longitude. In the west these include area of the Atlantic Ocean and in the east much of the western Pacific subduction zone maximizing in Honshu, Japan and the Kuril Islands and in New Guinea, Indonesia. These are the most likely areas to see tidal triggering of seismicity with this new moon. A strong to major quake is possible in the next week to 10 days with this new moon, possibly near these longitudes." (April 8-9, 2021)
This epicenter is near the geomagnetic equator and like similar events in the Celebes Sea and in Java today may have been prompted by the now-concluded strong geomagnetic storm previously identified in this summary as:
"The geomagnetic field saw active today. The AP level was 17. High latitude geomagnetic field saw stormy conditions with AP 35. Strong geomagnetic storms such as this can promote enhanced seismicity in the high latitudes and near the geomagnetic equator and this is likely in the next three days." (April 7-8, 2021)
The only events within about 200 km of today's epicenter within the past three years occurred as an M 6.3 on February 7, 2021 and an M 6.2 on January 17, 2019.
Forecast 132591 had expected today's event in New Guinea was likely around April 7.
O: 10APR2021 11:38:32 3.5S 145.7E Mw=6.0 EMSC NEAR N COAST OF NEW GUINEA, PN
P: 7APR2021 132591 7.0S 144.0E 4.0-5.4 BCBAA Papua New Guinea
A similar M 6.1 occurred several hours earlier in the area of the Celebes Sea south of the Philippines. NEIC reported this earthquake was felt with intensity III in Buayan, Southern Mindanao, Philippines. This is the strongest earthquake in the Celebes Sea region in at least a year. The last within about 200 km of this epicenter with M>=6.1 was an M 6.1 on December 15, 2020 but the last with larger magnitude in this area was an M 6.5 to the west on February 10, 2011. An M 7.3 occurred about 200 km northwest of today's epicenter on January 10, 2017. Forecast 132574 had expected today's activity to the south was likely around April 9.
O: 10APR2021 09:30:44 4.2N 124.6E Mw=6.1 EMSC CELEBES SEA
P: 9APR2021 132574 1.0N 124.0E 4.0-5.6 ACAAA Mindanao, Philippines
These events followed an M 6.0 felt widely in Java and noted in the previous issue of this summary as:
"The earthquake south of Java, Indonesia of M 6.0 is the strongest within about 200 km of that epicenter since an M 6.0 on July 25, 2015. The last such event with greater magnitude was an M 6.6 on September 28, 1998. Forecast 132592 had expected today's event in this region around April 7." (April 10, 2021)
NEIC reported today's earthquake of M 5.1 in Java, Indonesia was felt with intensity II-III in the area(s) of Java, Indonesia at Blitar and Malang.
O: 10APR2021 12:49:20 8.9S 112.5E ML=4.2 EMSC JAVA, INDONESIA
O: 10APR2021 07:00:17 8.4S 112.6E mb=6.0 EMSC JAVA, INDONESIA
O: 10APR2021 23:54:58 8.4S 112.5E mb=5.1 EMSC JAVA, INDONESIA
P: 7APR2021 132592 9.0S 110.0E 4.0-5.4 BACAA So. of Java
A moderately strong earthquake of M 5.5 also shook the South Shetland Islands today. It was not reported felt. It is located near the line of maximum longitude in the western hemisphere with the new moon and was probably promoted by strong tidal stresses associated with that alignment. An M 7.1 hit this area on January 23, 2021 and the strongest aftershock to date has been an M 5.5 on January 24, 2021. Forecast 132834 had expected today's event within about 150
km was likely around April 5.
O: 10APR2021 07:14:02 62.3S 58.3W Mw=5.5 EMSC SOUTH SHETLAND ISLANDS
P: 5APR2021 132834 61.0S 58.0W 3.0-5.6 BAAAA So. So. America
An unusual earthquake of M 5.0 in the South Pacific Ocean today may also have been related to high tidal stresses. This event is the strongest within about 500 km in at least 30 years. The only recorded event with M>=4 in the general region in this time was an M 4.7 on November 14, 1997 about 550 km northwest of today's epicenter.
O: 10APR2021 17:55:40 40.1S 124.5W mb=5.0 EMSC SOUTH PACIFIC OCEAN
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 10APR2021 15:18:24 28.5N 66.5E mb=4.5 EMSC PAKISTAN
O: 10APR2021 21:49:37 28.3N 67.3E mb=4.2 EMSC PAKISTAN
P: 7APR2021 132640 29.0N 68.0E 3.5-4.9 BAAAA Pakistan
O: 10APR2021 18:21:47 31.7N 90.7E mb=4.7 EMSC EASTERN XIZANG
P: 10APR2021 132708 30.0N 90.0E 3.8-5.5 ABAAA Xizang
O: 10APR2021 17:56:23 42.6N 79.3E mb=4.0 EMSC KYRGYZSTAN
P: 5APR2021 132719 42.0N 82.0E 4.0-5.4 BABAA Kirgizstan/Xinjiang
INDONESIA AND PHILIPPINES
O: 11APR2021 06:52:51 0.4N 97.7E ML=4.0 EMSC NIAS REGION, INDONESIA
P: 9APR2021 132577 0.0N 99.0E 4.0-5.4 AABAA So. Sumatera
O: 10APR2021 11:38:32 3.5S 145.7E Mw=6.0 EMSC NEAR N COAST OF NEW GUINEA, PN
P: 7APR2021 132591 7.0S 144.0E 4.0-5.4 BCBAA Papua New Guinea
O: 10APR2021 09:30:44 4.2N 124.6E Mw=6.1 EMSC CELEBES SEA
P: 9APR2021 132574 1.0N 124.0E 4.0-5.6 ACAAA Mindanao, Philippines
O: 10APR2021 07:15:13 5.4S 103.3E ML=4.0 EMSC SOUTHERN SUMATRA, INDONESIA
P: 7APR2021 132593 6.0S 103.0E 4.0-5.6 BAAAA So. of Sumatera
O: 11APR2021 01:21:06 5.7S 153.2E mb=4.9 EMSC NEW IRELAND REGION, P.N.G.
P: 6APR2021 132587 5.0S 153.0E 4.0-5.5 BAAAA New Britain
P: 9APR2021 132594 6.0S 155.0E 4.0-5.4 AABAA Solomon Islands
O: 10APR2021 16:00:20 7.3S 122.3E mb=4.8 EMSC FLORES SEA
P: 7APR2021 132584 7.0S 123.0E 4.0-5.5 BAAAA Flores Island area
O: 10APR2021 12:49:20 8.9S 112.5E ML=4.2 EMSC JAVA, INDONESIA
O: 10APR2021 07:00:17 8.4S 112.6E mb=6.0 EMSC JAVA, INDONESIA
O: 10APR2021 23:54:58 8.4S 112.5E mb=5.1 EMSC JAVA, INDONESIA
P: 7APR2021 132592 9.0S 110.0E 4.0-5.4 BACAA So. of Java
P: 7APR2021 132592 9.0S 110.0E 4.0-5.4 BABAA So. of Java
O: 10APR2021 12:27:02 3.8S 145.5E ML=4.6 EMSC NEAR N COAST OF NEW GUINEA, PNG.
CENTRAL AND SOUTH AMERICA
O: 10APR2021 10:04 37.9S 73.7W mb=5.3 GUC Los Rios at Valdivia; IV in Co
P: 6APR2021 132815 37.0S 74.0W 4.0-5.4 BAAAA Central Chile
GUC reported this earthquake was felt with intensity V in Los Rios at Valdivia; IV in Corral, Los Lagos, Mariquina, Mehuin; II in Futurono, Lago Ranco, Mafil, Rio Bueno and in Araucania with IV in Gorbea, Pucon, Queule, Villarca, III in Carahue, Nueva Imperial, Padre las Casas, Pitrufquen, Saavedra, Temuco, Teodoro Schmidt, Tolten, Vilcun, Chile.
NEIC reported this earthquake of M 5.3 in Bio-Bio, Chile was felt with intensity II-III in the area(s) of Araucania, Chile at Traiguen, Temuco.
O: 10APR2021 16:33 39.5S 73.1W mb=4.7 GUC BioBio at Los Alamos and Tirul
P: 6APR2021 132815 39.0S 73.0W 4.0-5.4 BAAAA Central Chile
GUC reported this earthquake was felt with intensity V in BioBio at Los Alamos and Tirula, IV in Lebuc, III in Concepcion, Hualpen, Los Angeles, Loa, Talcahuano; IV in La Araucania at Angol, Carahue, Collipulli, Curacautino, Galvannoc, Lautaro, Los Sauces, Lumaco, Nueva Imperial, Traiguen, Victoria, Villarica and V in Puern and Renaico and III in Los Rios at Panguipulli and Valdivia, Chile.
NEIC reported this earthquake of M 4.7 in Los Lagos, Chile was felt with intensity II-III in the area(s) of Los Lagos, Chile at Valdivia (IV) and Osorno and in Lonchche, Araucania.
O: 11APR2021 01:50:08 7.0S 80.3W ML=4.0 EMSC OFF COAST OF NORTHERN PERU
P: 10APR2021 132589 6.0S 79.0W 4.0-5.4 AAAAA No. Peru
O: 11APR2021 04:21:02 9.3S 71.4W mb=4.1 EMSC PERU-BRAZIL BORDER REGION
P: 7APR2021 132785 14.0S 71.0W 4.0-5.9 BCAAA Central Peru
O: 11APR2021 02:17:35 10.9N 86.4W ML=4.0 EMSC OFF COAST OF COSTA RICA
O: 11APR2021 01:42:26 11.0N 86.4W mb=4.6 EMSC OFF COAST OF COSTA RICA
P: 7APR2021 132617 13.0N 87.0W 3.5-5.8 BBAAA Nicaragua
O: 11APR2021 05:37:18 15.8N 93.9W mb=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
P: 8APR2021 132605 16.0N 93.0W 3.5-5.3 BAAAA Chiapas, Mexico
O: 10APR2021 07:07:36 16.1N 95.2W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO
P: 8APR2021 132605 16.0N 93.0W 3.5-5.3 AABAA Chiapas, Mexico
O: 10APR2021 23:22:30 18.4N 69.3W ML=3.2 EMSC DOMINICAN REPUBLIC REGION
O: 10APR2021 15:35:05 18.9N 70.3W ML=3.0 EMSC DOMINICAN REPUBLIC
O: 11APR2021 03:24:30 19.1N 69.6W ML=3.1 EMSC DOMINICAN REPUBLIC
P: 5APR2021 132628 20.0N 69.0W 3.0-4.7 CAAAA Bahamas/No. Caribbean
P: 8APR2021 132623 19.0N 71.0W 3.4-5.2 AAAAA Puerto Rico
O: 10APR2021 22:32:51 18.5N 101.6W ML=4.0 EMSC GUERRERO, MEXICO
P: 9APR2021 132615 18.0N 103.0W 3.5-5.4 AABAA Michoacan, Mexico
O: 11APR2021 06:18:59 18.9N 67.6W Md=3.2 EMSC PUERTO RICO REGION
P: 6APR2021 132622 18.0N 67.0W 3.4-5.1 BAAAA Puerto Rico
O: 10APR2021 10:00:02 19.1N 64.8W Md=3.5 EMSC VIRGIN ISLANDS REGION
P: 6APR2021 132612 19.0N 64.0W 3.0-5.1 BAAAA Leeward Islands
O: 10APR2021 23:47:28 24.1S 67.1W mb=4.2 EMSC SALTA, ARGENTINA
P: 8APR2021 132799 24.0S 69.0W 4.0-5.8 AABAA Coast No. Chile
O: 10APR2021 16:33:53 39.5S 73.1W Mw=4.7 EMSC LOS LAGOS, CHILE
P: 6APR2021 132815 39.0S 73.0W 4.0-5.4 BAAAA Central Chile
O: 10APR2021 07:31:02 37.9S 73.7W mb=4.4 EMSC OFFSHORE BIO-BIO, CHILE
O: 10APR2021 07:52:47 37.9S 73.7W Mw=5.3 EMSC OFFSHORE BIO-BIO, CHILE
P: 6APR2021 132815 37.0S 74.0W 4.0-5.4 BAAAA Central Chile
AFRICA AND EUROPE
O: 10APR2021 22:53:58 38.3N 20.7E mb=4.5 EMSC GREECE
P: 9APR2021 132677 39.0N 22.0E 3.0-4.5 AAAAA No. Greece
NEIC reported this earthquake of M 4.5 in Greece was felt with intensity II-III in the area(s) of Greece in Kefallinia at Sami and Argostolion.
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 10APR2021 09:06:56 17.5S 168.0E mb=4.5 EMSC VANUATU
P: 3APR2021 132796 17.0S 168.0E 4.0-5.5 CAAAA Vanuatu Islands
No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.
OCEAN RIDGES
O: 10APR2021 17:55:40 40.1S 124.5W mb=5.0 EMSC SOUTH PACIFIC OCEAN
O: 10APR2021 07:14:02 62.3S 58.3W Mw=5.5 EMSC SOUTH SHETLAND ISLANDS
P: 5APR2021 132834 61.0S 58.0W 3.0-5.6 BAAAA So. So. America
ZEALANDIA AND AUSTRALIA REGION
O: 10APR2021 17:51:32 31.6S 179.8W mb=4.9 EMSC KERMADEC ISLANDS REGION
P: 9APR2021 132819 30.0S 178.0W 4.0-5.6 ABBAA No. Kermadec Islands
O: 10APR2021 17:14:55 33.6S 179.1E ML=3.5 EMSC SOUTH OF KERMADEC ISLANDS
O: 10APR2021 23:33:15 34.4S 179.2E ML=3.8 EMSC SOUTH OF KERMADEC ISLANDS
O: 10APR2021 22:24:39 37.4S 179.9E ML=3.8 EMSC OFF E. COAST OF N. ISLAND, N.Z
O: 10APR2021 14:40:20 37.5S 179.9W mb=4.9 EMSC EAST OF NORTH ISLAND, N.Z.
O: 11APR2021 01:18:52 37.5S 179.9E ML=3.5 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 10APR2021 12:39:35 37.7S 179.7E ML=4.0 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 10APR2021 07:36:04 37.4S 180.0W ML=3.5 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 5APR2021 132818 37.0S 179.0W 3.5-5.0 BAAAA E. of North Islands N.Z.
O: 10APR2021 10:46:37 41.5S 174.5E ML=3.6 EMSC COOK STRAIT, NEW ZEALAND
O: 10APR2021 10:58:29 41.5S 174.5E ML=4.0 EMSC COOK STRAIT, NEW ZEALAND
O: 10APR2021 10:58:29 41.4S 174.5E MS=4.1 GEONET Felt with strong intensity
P: 7APR2021 132824 40.0S 175.0E 3.0-4.6 BBAAA North Island, N.Z.
GEONET reported this earthquake was felt with strong intensity in the area southwest of Wellington. 6359 reports of felt activity were made to GeoNet - 3296 of weak and 2727 of light intensity came from the area. 319 reports of moderate and 15 of strong, severe or extreme shaking were noted one person.
JAPAN AND KURIL ISLANDS
O: 10APR2021 07:36:28 29.3N 129.6E Mw=5.2 EMSC RYUKYU ISLANDS, JAPAN
O: 10APR2021 13:10:42 29.3N 129.5E mb=4.9 EMSC RYUKYU ISLANDS, JAPAN
O: 10APR2021 14:09:30 29.3N 129.3E ML=4.0 EMSC RYUKYU ISLANDS, JAPAN
O: 10APR2021 18:18:14 29.3N 129.5E mb=4.7 EMSC RYUKYU ISLANDS, JAPAN
O: 10APR2021 20:20:38 29.3N 129.4E mb=4.8 EMSC RYUKYU ISLANDS, JAPAN
O: 10APR2021 20:40:44 29.9N 129.3E mb=4.8 EMSC RYUKYU ISLANDS, JAPAN
O: 10APR2021 23:00:21 29.2N 129.4E mb=4.7 EMSC RYUKYU ISLANDS, JAPAN
P: 8APR2021 132670 31.0N 131.0E 3.5-5.2 ABAAA Kyushu, Japan area
O: 11APR2021 06:24:22 24.4N 126.6E mb=4.6 EMSC RYUKYU ISLANDS, JAPAN
P: 8APR2021 132641 25.0N 127.0E 4.0-5.5 BAAAA Ryukyu Islands
O: 10APR2021 20:01:17 45.8N 149.6E mb=4.7 EMSC KURIL ISLANDS
P: 4APR2021 132740 45.0N 150.0E 3.5-5.6 CAAAA So. Kurils
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 10APR2021 18:37:27 32.6N 115.7W Ml=2.1 EMSC BAJA CALIFORNIA, MEXICO
O: 10APR2021 13:22:04 32.7N 115.5W ML=3.3 EMSC SOUTHERN CALIFORNIA
O: 10APR2021 13:22:04 32.7N 115.5W ML=3.4 ANSS SOUTHERN CALIFORNIA
P: 4APR2021 132689 32.9N 115.6W 2.5-4.4 CAAAA So. California
NEIC reported this earthquake of M 3.4 in Southern California was felt with intensity II-III in the area(s) of Southern California at Neber, Holtville (IV), Calexico, El Centro, Imperial, Lakeside and in Yuma, Arizona.
O: 11APR2021 01:09:36 35.9N 117.7W Ml=2.4 EMSC CENTRAL CALIFORNIA
P: 8APR2021 132696 35.8N 117.6W 2.5-4.9 BAAAA So. California
O: 10APR2021 23:57:28 36.5N 114.7W ml=2.5 EMSC NEVADA
P: 10APR2021 132673 37.3N 114.9W 2.5-4.5 AAAAA Nevada area
O: 10APR2021 17:55:09 37.6N 118.9W Md=2.0 EMSC CENTRAL CALIFORNIA
P: 8APR2021 132652 37.5N 118.6W 2.5-4.8 AAAAA California/Nevada area
O: 10APR2021 11:50:13 37.6N 121.7W ML=2.7 EMSC NORTHERN CALIFORNIA
O: 10APR2021 11:50:13 37.6N 121.7W ML=2.9 ANSS NORTHERN CALIFORNIA
P: 8APR2021 132661 37.4N 121.8W 2.5-4.7 AAAAA Central California
NEIC reported this earthquake of M 2.9 in the San Francisco, California was felt with intensity II-III in the area(s) of San Francisco, California at Livermore, Pleasanton, Union City, San Ramon, Brentwood, Sunnyvale, San jose and Walnut Creek.
O: 10APR2021 11:01:59 38.8N 122.8W Md=2.0 EMSC NORTHERN CALIFORNIA
O: 10APR2021 11:01:59 38.8N 122.8W Md=2.0 EMSC NORTHERN CALIFORNIA
O: 10APR2021 14:13:21 38.5N 122.7W ML=3.0 EMSC NORTHERN CALIFORNIA
O: 10APR2021 14:13:21 38.5N 122.7W ML=3.3 ANSS NORTHERN CALIFORNIA
P: 7APR2021 132662 38.7N 122.7W 2.5-4.6 BAAAA Central California
NEIC reported this earthquake of M 3.3 in Northern California was felt with intensity II-III in the area(s) of Northern California at Santa Rosa, Calistoga, Deer Park, Kenwood, Angwin, Saint Helena.
O: 10APR2021 20:39:53 38.2N 117.9W ml=2.1 EMSC NEVADA
P: 8APR2021 132652 37.5N 118.6W 2.5-4.8 AAAAA California/Nevada area
O: 10APR2021 08:16:32 40.2N 121.1W Md=2.1 EMSC NORTHERN CALIFORNIA
P: 6APR2021 132731 40.7N 121.3W 2.5-4.5 BAAAA Northern California
ALASKA
O: 10APR2021 12:45:44 60.0N 149.3W ML=3.0 EMSC KENAI PENINSULA, ALASKA
P: 8APR2021 132769 60.9N 147.4W 3.2-5.1 AAAAA Central Alaska
O: 10APR2021 21:35:28 66.3N 157.3W ML=3.4 EMSC NORTHERN ALASKA
P: 5APR2021 132772 64.0N 154.0W 3.0-5.0 BCBAA Northern Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 10APR2021 07:38:15 47.5N 121.6W Ml=2.8 EMSC WASHINGTON
P: 6APR2021 132742 47.7N 120.3W 2.0-4.4 BAAAA Washington state, U.S.
NEIC reported this earthquake of M 2.8 in Washington State was felt with intensity II-III in the area(s) of Washington State at North Bend, Snoqualmie, Issaquah, Maple Valley, Black Diamond, Duvall, Redmond, Kent.
O: 10APR2021 07:34:14 48.9N 125.2W Ml=3.3 EMSC VANCOUVER ISLAND, CANADA REGIO
P: 3APR2021 132741 49.0N 126.0W 2.8-5.1 CAAAA Vancouver Island area
NEIC reported this earthquake of M 3.3 in Vancouver Island, Canada was felt with intensity II-III in the area(s) of British Columbia at Icluelet and Victoria.
ROCKY MOUNTAINS REGION
O: 11APR2021 03:02:03 39.3N 106.8W ML=2.8 EMSC COLORADO
P: 10APR2021 132666 39.2N 108.4W 2.0-3.9 AABAA Colorado area
NEIC reported this earthquake of M 2.8 in Northern Colorado was felt with intensity II-III in the area(s) of Northern Colorado at Aspen.
O: 10APR2021 17:08:29 44.2N 115.1W ML=2.6 EMSC SOUTHERN IDAHO
O: 10APR2021 08:52:15 44.3N 115.0W Ml=2.2 EMSC SOUTHERN IDAHO
O: 10APR2021 08:56:51 44.1N 115.1W Ml=2.7 EMSC SOUTHERN IDAHO
P: 6APR2021 132723 44.4N 115.1W 2.0-4.2 BAAAA Montana/Idaho
EASTERN U.S./CANADA
O: 10APR2021 16:07:39 29.2N 97.6W mb=2.6 EMSC SOUTHERN TEXAS
O: 11APR2021 02:00:07 34.4N 97.5W ML=2.5 EMSC OKLAHOMA
O: 10APR2021 12:26:23 35.1N 95.4W ML=2.4 EMSC OKLAHOMA
O: 10APR2021 22:07:37 36.0N 98.5W ML=2.0 EMSC OKLAHOMA
O: 10APR2021 09:54:04 34.4N 97.4W ML=2.1 EMSC OKLAHOMA
P: 10APR2021 132700 35.0N 97.0W 2.0-4.3 AAAAA Southern Plains
HAWAII
O: 11APR2021 00:04:20 19.3N 155.4W ML=3.6 EMSC ISLAND OF HAWAII, HAWAII
O: 11APR2021 06:08:51 19.2N 155.5W ML=3.7 EMSC ISLAND OF HAWAII, HAWAII
P: 9APR2021 132610 19.9N 156.1W 3.0-4.7 AAAAA Hawaii
NEIC reported these earthquakes of M 3.0 and 3.1 in Hawaii were felt with intensity II-III in the area(s) of Hawaii at Naalehu, Captain Cook, Volcano, Mountain View, Kealakekua, Kailua Kona and Kamuela.
STRONG EARTHQUAKE IN NEW GUINEA PROMOTED BY TIDAL STRESSES
EARTHQUAKE SUMMARY FOR APRIL 10, 2021
The strongest earthquake in the world today was an M 6.0-6.1 off the north coast of New Guinea. NEIC reported it was felt in Papua New Guinea with intensity II-III at Madang and Mount Hagen. It was probably promoted by high tidal stresses associated with the New Moon of April 12 as noted in previous issues of this report maximize near this longitude:
"The new moon will arrive on April 12 at 02:31 UT. Longitudes which are near local solar midnight at this time are near 37 West and those at local solar noon are near 143 East longitude. In the west these include area of the Atlantic Ocean and in the east much of the western Pacific subduction zone maximizing in Honshu, Japan and the Kuril Islands and in New Guinea, Indonesia. These are the most likely areas to see tidal triggering of seismicity with this new moon. A strong to major quake is possible in the next week to 10 days with this new moon, possibly near these longitudes." (April 8-9, 2021)
This epicenter is near the geomagnetic equator and like similar events in the Celebes Sea and in Java today may have been prompted by the now-concluded strong geomagnetic storm previously identified in this summary as:
"The geomagnetic field saw active today. The AP level was 17. High latitude geomagnetic field saw stormy conditions with AP 35. Strong geomagnetic storms such as this can promote enhanced seismicity in the high latitudes and near the geomagnetic equator and this is likely in the next three days." (April 7-8, 2021)
The only events within about 200 km of today's epicenter within the past three years occurred as an M 6.3 on February 7, 2021 and an M 6.2 on January 17, 2019.
Forecast 132591 had expected today's event in New Guinea was likely around April 7.
O: 10APR2021 11:38:32 3.5S 145.7E Mw=6.0 EMSC NEAR N COAST OF NEW GUINEA, PN
P: 7APR2021 132591 7.0S 144.0E 4.0-5.4 BCBAA Papua New Guinea
A similar M 6.1 occurred several hours earlier in the area of the Celebes Sea south of the Philippines. NEIC reported this earthquake was felt with intensity III in Buayan, Southern Mindanao, Philippines. This is the strongest earthquake in the Celebes Sea region in at least a year. The last within about 200 km of this epicenter with M>=6.1 was an M 6.1 on December 15, 2020 but the last with larger magnitude in this area was an M 6.5 to the west on February 10, 2011. An M 7.3 occurred about 200 km northwest of today's epicenter on January 10, 2017. Forecast 132574 had expected today's activity to the south was likely around April 9.
O: 10APR2021 09:30:44 4.2N 124.6E Mw=6.1 EMSC CELEBES SEA
P: 9APR2021 132574 1.0N 124.0E 4.0-5.6 ACAAA Mindanao, Philippines
These events followed an M 6.0 felt widely in Java and noted in the previous issue of this summary as:
"The earthquake south of Java, Indonesia of M 6.0 is the strongest within about 200 km of that epicenter since an M 6.0 on July 25, 2015. The last such event with greater magnitude was an M 6.6 on September 28, 1998. Forecast 132592 had expected today's event in this region around April 7." (April 10, 2021)
NEIC reported today's earthquake of M 5.1 in Java, Indonesia was felt with intensity II-III in the area(s) of Java, Indonesia at Blitar and Malang.
O: 10APR2021 12:49:20 8.9S 112.5E ML=4.2 EMSC JAVA, INDONESIA
O: 10APR2021 07:00:17 8.4S 112.6E mb=6.0 EMSC JAVA, INDONESIA
O: 10APR2021 23:54:58 8.4S 112.5E mb=5.1 EMSC JAVA, INDONESIA
P: 7APR2021 132592 9.0S 110.0E 4.0-5.4 BACAA So. of Java
A moderately strong earthquake of M 5.5 also shook the South Shetland Islands today. It was not reported felt. It is located near the line of maximum longitude in the western hemisphere with the new moon and was probably promoted by strong tidal stresses associated with that alignment. An M 7.1 hit this area on January 23, 2021 and the strongest aftershock to date has been an M 5.5 on January 24, 2021. Forecast 132834 had expected today's event within about 150
km was likely around April 5.
O: 10APR2021 07:14:02 62.3S 58.3W Mw=5.5 EMSC SOUTH SHETLAND ISLANDS
P: 5APR2021 132834 61.0S 58.0W 3.0-5.6 BAAAA So. So. America
An unusual earthquake of M 5.0 in the South Pacific Ocean today may also have been related to high tidal stresses. This event is the strongest within about 500 km in at least 30 years. The only recorded event with M>=4 in the general region in this time was an M 4.7 on November 14, 1997 about 550 km northwest of today's epicenter.
O: 10APR2021 17:55:40 40.1S 124.5W mb=5.0 EMSC SOUTH PACIFIC OCEAN
ANTIPODAL EVENTS IN JAVA AND LA SOUFRIERE, CARIBBEAN POSSIBLY RELATED
EARTHQUAKE SUMMARY FOR APRIL 9, 2021
The strongest geophysical activity in the world today occurred at the antipodal regions of Java and St. Vincent and the Grenadines. These may have been related to energy from the tropical cyclones Odette and Seroja which have been in the region south of Java over the past several days and could have also influenced seismicity in the eastern Caribbean. TC Seroja passed over the exact antipode of La Soufriere on April 7-8.
An eruption of La Soufriere on St. Vincent and the Grenadines occurred today, the first such eruption since 1979. As many as 20,000 were evacuated as volcanic bombs, sulfur, smoke and ash fell from the eruption. A second eruption followed about 6 hours later.
This eruption was followed by the largest earthquake of the day - an M 6.0 in Java, Indonesia. This is located near the antipode of the eruption and may have been promoted by energy from that earlier event. NEIC reported this earthquake was felt with maximum intensity V in Java at Malang; IV in Srandakan and II-III in Singosari, Kertosono, Mojokerto, Surabaya, Kasihan and in Kula, Bali, Indonesia. BMG reported this earthquake with Magnitude M 5.6. That agency reported maximum intensity V at Ruren, IV at Karangkates, Malang, Bitar; III-IV in Kedin, Trenggalek, Jombang, III in Nganjuk, Ponorogo, Madiun, Yogyakarta, Ngawi, Lombok Barat, Mataram, Kuta, Jimbaran, Denpasar and II in Mojoketo, Klaren, Lombok Utara, Sumbawa, Tabanen, Klungkung and Banjamegara. This activity near the geomagnetic equator may be related to the strong geomagnetic storm of April 7. This summary had noted this in previous issues as:
"The geomagnetic field saw active today. The AP level was 17. High latitude geomagnetic field saw stormy conditions with AP 35. Strong geomagnetic storms such as this can promote enhanced seismicity in the high latitudes and near the geomagnetic equator and this is likely in the next three days." (April 7-8, 2021)
It may also be related to tidal stresses associated with the coming New Moon as forecast in previous issues of this summary as:
"The new moon will arrive on April 12 at 02:31 UT. Longitudes which are near local solar midnight at this time are near 37 West and those at local solar noon are near 143 East longitude. In the west these include area of the Atlantic Ocean and in the east much of the western Pacific subduction zone maximizing in Honshu, Japan and the Kuril Islands and in New Guinea, Indonesia. These are the most likely areas to see tidal triggering of seismicity with this new moon. A strong to major quake is possible in the next week to 10 days with this new moon, possibly near these longitudes." (April 8-9, 2021)
Tropical Cyclones Seroja and Odette may also have influenced the timing of the earthquake in Java as previously reported in this summary:
"TC Seroja continued near Timor, Indonesia today with winds up to 70 kts. It is expected to track to the southwest over the next several days and may help enhance seismicity in the area of Timor." (April 6-8, 2021)
and
"TC Seroja continued south of Java, Indonesia today with winds up to 75 kts. It is expected to track to the southwest over the next several days and may help enhance seismicity in the area of Java to the north." (April 9, 2021)
"Tropical Cyclone Odette (27S) continued today in the area south of Sumatra with winds up to 65 kts. It is expected to track to the east and south over the next several days." (April 8-9, 2021)
The eruption of La Soufriere occurred at the antipode of Tropical Cyclone Seroja, perhaps supporting the antipodal occurrence of the events in the Caribbean and Java today.
Seismic enhancement in the region of the Windward Islands had been expected in forecast 132626 in early April to the south of the eruption of La Soufriere. This epicenter is at the third node (120 degrees) from both the M 7.3 off North Island, New Zealand and the M 8.1 in the Kermadec Islands of March 4, 2021 and was probably enhanced by energy from those sources.
O: 9APR2021 12:40:00 13.2N 61.1W ML=5.5 NEWS ERUPTION OF SOUFRIERE, GRENADI
P: 4APR2021 132626 11.0N 62.0W 3.4-5.1 BCAAA Windward Islands
The earthquake south of Java, Indonesia of M 6.0 is the strongest within about 200 km of that epicenter since an M 6.0 on July 25, 2015. The last such event with greater magnitude was an M 6.6 on September 28, 1998. Forecast 132592 had expected today's event in this region around April 7.
O: 10APR2021 07:00:17 8.4S 112.6E mb=6.0 EMSC JAVA, INDONESIA
P: 7APR2021 132592 9.0S 110.0E 4.0-5.4 BABAA So. of Java
An unusual earthquake of M 4.4 shook areas of Romania today. NEIC reported this earthquake of M 4.4 in Romania was felt with intensity II-III in the area(s) of Romania at Brasov, Stefanestii, Bucharest, Popesti-Leordeni, Bragadiru, Lifov, and in Razgrad, Bulgaria. The only earthquake in Romania of larger magnitude since April, 2020 was an M 4.9 on April 24, 2020. Forecast 132738 had expected today's event within about 50 km of this epicenter was likely around April 6. This epicenter is located at 144 degrees from the series of events including the M 7.7 in the Loyalty Islands of early February and was probably promoted by energy from that source.
O: 9APR2021 18:36:47 45.8N 26.6E mb=4.4 EMSC ROMANIA
P: 5APR2021 132738 46.0N 26.0E 3.0-5.0 BAAAA Romania/NW Turkey
An earthquake of M 3.3 in northern New Mexico was felt in the epicentral area today. The only earthquake within about 100 km of this epicenter with M>=3.3 in New Mexico in the past 10 years was an M 3.7 near today's epicenter on July 30, 2020. Earthquakes of M 3.5-3.6 occurred about 100 km south of today's event on October 20, 2016 and October 17, 2011 and two events of M 3.5 and 3.7 hit the area in September, 2009 and June, 2008. Forecast 132665 had expected enhanced regional activity around April 5.
O: 9APR2021 14:49:16 36.3N 106.8W ML=3.3 EMSC NEW MEXICO
P: 5APR2021 132665 36.9N 105.1W 2.0-4.1 BABAA Colorado area
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 10APR2021 04:47:20 22.7N 121.4E mb=4.4 EMSC TAIWAN REGION
O: 9APR2021 09:10:26 24.8N 122.1E ML=4.2 TAI Hualien, Taiwan
O: 10APR2021 04:47:21 22.7N 121.3E ML=4.4 TAI Hualien, Taiwan
P: 9APR2021 132644 23.0N 121.0E 4.0-5.6 ABAAA Taiwan
CWB reported this earthquake of M 4.2 was felt with intensity II in Yilan and I in Taipei, Hualien and Hsinchu Counties, Taiwan.
The M 4.4 was felt with intensity III in Taitung, and I in Hualien and Pingtung Counties, Taiwan.
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 9APR2021 15:10:46 0.5S 131.9E ML=4.0 EMSC NEAR N COAST OF PAPUA, INDONES
P: 9APR2021 132600 5.0S 130.0E 4.0-5.5 ACBAA West Irian, PNG
O: 9APR2021 17:55:04 2.4N 128.5E mb=4.5 EMSC HALMAHERA, INDONESIA
P: 8APR2021 132572 4.0N 128.0E 4.0-5.6 ABAAA Halmahera
O: 10APR2021 00:04:57 2.8S 101.3E ML=4.4 EMSC SOUTHERN SUMATRA, INDONESIA
P: 2APR2021 132593 4.0S 102.0E 4.0-5.5 CBAAA So. of Sumatera
O: 09APR2021 15:14:29 4.8N 96.2E ML=4.7 EMSC NORTHERN SUMATRA, INDONESIA
O: 9APR2021 08:08:59 3.1N 96.4E mb=4.3 EMSC NORTHERN SUMATRA, INDONESIA
P: 7APR2021 132576 4.0N 96.0E 4.0-5.8 AAAAA Nicobar Islands
O: 9APR2021 13:39:47 6.2N 126.0E ML=4.2 EMSC MINDANAO, PHILIPPINES
P: 9APR2021 132573 6.0N 127.0E 4.0-5.8 AAAAA Halmahera
O: 9APR2021 06:42:46 7.7S 127.7E ML=4.5 EMSC KEPULAUAN BARAT DAYA, INDONESI
P: 5APR2021 132580 6.0S 128.0E 4.0-5.4 BBAAA Banda Sea
O: 9APR2021 20:09:06 8.3S 117.3E ML=4.0 EMSC SUMBAWA REGION, INDONESIA
P: 8APR2021 132596 8.0S 117.0E 4.0-5.4 AAAAA Sumbawa Island area
O: 10APR2021 07:00:17 8.4S 112.6E mb=6.0 EMSC JAVA, INDONESIA
P: 7APR2021 132592 9.0S 110.0E 4.0-5.4 BABAA So. of Java
CENTRAL AND SOUTH AMERICA
O: 10APR2021 05:16:30 9.6N 84.9W ML=4.0 EMSC COSTA RICA
P: 5APR2021 132603 10.0N 84.0W 3.5-5.5 BAAAA Caribbean Sea
O: 9APR2021 12:40:00 13.2N 61.1W ML=5.5 NEWS ERUPTION OF SOUFRIERE, GRENADI
P: 4APR2021 132626 11.0N 62.0W 3.4-5.1 BCAAA Windward Islands
O: 09APR2021 07:36:58 17.0N 99.6W ML=4.3 EMSC GUERRERO, MEXICO
O: 9APR2021 22:42:22 16.8N 98.8W ML=4.0 EMSC GUERRERO, MEXICO
P: 6APR2021 132621 17.0N 98.0W 3.5-5.2 BAAAA Oaxaca, Mexico
O: 9APR2021 08:18:41 17.0N 93.9W ML=4.2 EMSC OAXACA, MEXICO
P: 8APR2021 132605 16.0N 93.0W 3.5-5.3 AAAAA Chiapas, Mexico
O: 9APR2021 19:00:11 27.6N 111.6W ML=3.6 EMSC GULF OF CALIFORNIA
P: 9APR2021 132632 28.0N 112.0W 3.5-5.3 AAAAA Gulf of California
O: 9APR2021 06:53:18 29.7S 69.6W Mw=4.3 EMSC SAN JUAN, ARGENTINA
P: 6APR2021 132798 29.0S 68.0W 4.0-5.6 BABAA Argentina
P: 7APR2021 132812 31.0S 70.0W 4.0-5.8 ABAAA Central Chile
AFRICA AND EUROPE
O: 9APR2021 18:36:47 45.8N 26.6E mb=4.4 EMSC ROMANIA
P: 5APR2021 132738 46.0N 26.0E 3.0-5.0 BAAAA Romania/NW Turkey
O: 10APR2021 05:55:01 46.5N 14.4E ML=2.9 EMSC AUSTRIA
P: 9APR2021 132710 45.0N 16.0E 3.0-5.1 ABBAA Adriatic Sea
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 09APR2021 12:00:40 18.0S 178.4W mb=4.2 EMSC FIJI REGION
O: 9APR2021 11:24:29 17.7S 178.7W Mw=5.2 EMSC FIJI REGION
P: 5APR2021 132795 17.0S 179.0W 4.0-5.6 BAAAA Tonga Islands
O: 10APR2021 01:32:18 23.5S 171.8E mb=4.6 EMSC SOUTHEAST OF LOYALTY ISLANDS
O: 10APR2021 04:15:54 20.0S 169.2E Mw=5.1 EMSC VANUATU
O: 9APR2021 12:51:29 23.4S 171.8E Mw=5.0 EMSC SOUTHEAST OF LOYALTY ISLANDS
P: 6APR2021 132800 23.0S 171.0E 4.0-5.4 BAAAA Loyalty Islands
OCEAN RIDGES
No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.
ZEALANDIA AND AUSTRALIA REGION
O: 9APR2021 20:43:14 30.2S 180.0E ML=4.6 EMSC KERMADEC ISLANDS REGION
P: 9APR2021 132801 28.0S 177.0W 4.0-5.6 ACBAA No. Kermadec Islands
O: 9APR2021 18:36:11 37.7S 179.8E ML=3.7 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 5APR2021 132819 38.0S 177.0E 3.0-4.6 BABAA North Island, N.Z.
O: 9APR2021 11:14:16 39.8S 175.9E ML=3.9 EMSC NORTH ISLAND OF NEW ZEALAND
P: 7APR2021 132824 40.0S 175.0E 3.0-4.6 AAAAA North Island, N.Z.
O: 9APR2021 11:21:30 40.1S 173.1E ML=3.6 EMSC COOK STRAIT, NEW ZEALAND
P: 7APR2021 132824 40.0S 175.0E 3.0-4.6 AABAA North Island, N.Z.
JAPAN AND KURIL ISLANDS
O: 10APR2021 01:54:56 29.3N 129.3E mb=4.4 EMSC RYUKYU ISLANDS, JAPAN
O: 10APR2021 05:07:30 29.3N 129.3E ML=4.4 EMSC RYUKYU ISLANDS, JAPAN
O: 10APR2021 06:52:11 29.3N 129.5E ML=4.8 EMSC RYUKYU ISLANDS, JAPAN
O: 9APR2021 22:07:32 29.3N 129.4E Mw=5.3 EMSC RYUKYU ISLANDS, JAPAN
P: 5APR2021 132635 29.0N 131.0E 4.0-5.4 BABAA Kyushu Japan
P: 8APR2021 132670 31.0N 131.0E 3.5-5.2 ABBAA Kyushu, Japan area
O: 9APR2021 16:59:30 37.7N 141.8E ML=4.3 EMSC NEAR EAST COAST OF HONSHU, JAP
P: 7APR2021 132683 38.0N 140.0E 4.0-5.6 AABAA Off East Coast Honshu
NEIC reported this earthquake of M 4.3 in Iwate, Japan was felt with intensity II-III in the area(s) of Iwate, Japan at Miyako.
O: 9APR2021 08:54:08 40.0N 141.5E mb=4.3 EMSC NEAR EAST COAST OF HONSHU, JAP
P: 9APR2021 132716 40.0N 142.0E 3.5-5.6 AAAAA Hokkaido, Japan
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 09APR2021 20:29:53 33.1N 115.6W Ml=2.2 EMSC SOUTHERN CALIFORNIA
O: 9APR2021 08:47:05 32.8N 115.8W Ml=2.1 EMSC SOUTHERN CALIFORNIA
P: 4APR2021 132689 32.9N 115.6W 2.5-4.4 BAAAA So. California
O: 10APR2021 03:57:57 34.2N 116.5W ML=2.8 EMSC SOUTHERN CALIFORNIA
O: 10APR2021 03:57:57 34.2N 116.5W ML=3.0 ANSS SOUTHERN CALIFORNIA
P: 8APR2021 132694 34.3N 116.5W 2.5-4.4 AAAAA So. California
NEIC reported this earthquake of M 3.0 in Yucca Valley, Southern California was felt with intensity II-III in the area(s) of Yucca Valley, Southern California at Joshua Tree, Morongo Valley, Twentynine Palms, San Bernardino, Apple Valley, Desert Center, Fallbrook, Chino and Irvine.
O: 9APR2021 21:31:31 35.9N 115.3W ml=2.1 EMSC NEVADA
P: 10APR2021 132673 37.3N 114.9W 2.5-4.5 ABAAA Nevada area
P: 10APR2021 132694 35.5N 116.4W 2.5-4.5 AAAAA So. California
O: 9APR2021 22:54:49 35.9N 117.7W Ml=2.2 EMSC CENTRAL CALIFORNIA
P: 8APR2021 132696 35.8N 117.6W 2.5-4.9 AAAAA So. California
O: 9APR2021 23:12:21 40.3N 123.2W Md=2.3 EMSC NORTHERN CALIFORNIA
P: 5APR2021 132663 39.7N 123.7W 2.5-4.4 BAAAA Central California
O: 9APR2021 10:10:56 40.4N 124.4W Md=2.1 EMSC OFFSHORE NORTHERN CALIFORNIA
P: 7APR2021 132732 40.6N 124.9W 2.5-4.5 AAAAA Off Coast of No. Calif
O: 9APR2021 13:08:50 40.9N 121.9W Md=2.0 EMSC NORTHERN CALIFORNIA
P: 6APR2021 132731 40.7N 121.3W 2.5-4.5 BAAAA Northern California
ALASKA
No events of M>=3 were located in Alaska today.
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 9APR2021 13:42:43 51.2N 131.2W MB=3.6 ECAN Bella Bella, BC
P: 7APR2021 132753 50.4N 130.2W 3.0-5.0 AAAAA British Colombia
ROCKY MOUNTAINS REGION
O: 9APR2021 21:26:33 31.6N 104.3W ML=2.7 EMSC WESTERN TEXAS
P: 7APR2021 132687 32.6N 104.6W 2.0-3.9 AAAAA SW U.S.A
O: 9APR2021 14:49:16 36.3N 106.8W ML=3.3 EMSC NEW MEXICO
P: 5APR2021 132665 36.9N 105.1W 2.0-4.1 BABAA Colorado area
O: 9APR2021 12:34:29 44.3N 115.1W Ml=2.7 EMSC SOUTHERN IDAHO
P: 6APR2021 132723 44.4N 115.1W 2.0-4.2 BAAAA Montana/Idaho
EASTERN U.S./CANADA
O: 10APR2021 05:49:07 29.2N 97.7W mb=3.2 EMSC SOUTHERN TEXAS
O: 9APR2021 08:15:25 35.2N 95.3W ML=2.0 EMSC OKLAHOMA
P: 10APR2021 132700 35.0N 97.0W 2.0-4.3 AABAA Southern Plains
HAWAII
No earthquakes of M>=3 were located in Hawaii.
MODERATELY STRONG QUAKE IN CENTRAL ALASKA
EARTHQUAKE SUMMARY FOR APRIL 8, 2021
The strongest earthquake in the world today was an M 5.5 in Central Alaska near Cantwell. NEIC reported maximum intensity with this quake was V in Cantwell; IV in Matanuska-Sustina border, Healy, Talkeetna, and III in Anderson, Fairbanks, Delta Junction, Glennallen, Clear and Palmer, Alaska. This is the strongest earthquake within about 200 km of this epicenter in Central Alaska since an M 7.9 in the Denali area of Alaska of November 3, 2002. An earthquake of M 7.0 occurred about 250 km southwest of this in the Anchorage, Alaska area on November 30, 2018 and as an M 6.8 on December 4, 2012. Forecast 132771 had expected today's event within about 25 km of this epicenter was likely in early April around April 4. The last earthquake in Alaska outside the Andreanof Islands of M>=5.5 occurred with the M 7.6 in the Alaska Peninsula on October 19, 2020. The last such event in central, southern or eastern Alaska was the M 7.0 near Anchorage on November 30, 2018. In the previous issue of this summary, increased seismicity in Alaska had been noted as:
"The strongest earthquake in the U.S. or Canada today was an M 4.9 in the western Fox Islands, Aleutians, Alaska. It was not reported felt in this remote area. This is the strongest earthquake in the Fox Islands in the past four months - since an M 6.4 on December 1, 2020 about 50 km to the east of today's epicenter. Forecast 132755 had expected today's event was likely in this area of the Fox Islands around April 4. Seismicity in Alaska has been quiet in recent weeks and today's event may preceded enhanced regional seismicity associated with the strong geomagnetic storm at high latitudes which reached maximum near this time. This summary had noted this geomagnetic storm as:" (April 8, 2021)
"The geomagnetic field saw active today. The AP level was 17. High latitude geomagnetic field saw stormy conditions with AP 35. Strong geomagnetic storms such as this can promote enhanced seismicity in the high latitudes and near the geomagnetic equator and this is likely in the next three days." (April 7-8, 2021)
Today's event in Central Alaska was located at 103 degrees from the M 7.3 off North Island, New Zealand of March 4. Triggering of seismicity at this distance from large earth disturbances is common and energy from the New Zealand event probably helped promote today's earthquake in Alaska. Strong aftershocks in New Zealand both north of North Island and in the Kermadec Islands are still continuing.
O: 8APR2021 17:10:18 63.2N 148.7W Mw=5.5 EMSC CENTRAL ALASKA
P: 4APR2021 132771 63.0N 148.6W 3.2-5.0 BAAAA Central Alaska
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 8APR2021 12:53:41 30.8N 71.2E ML=4.0 EMSC PAKISTAN
P: 7APR2021 132640 29.0N 68.0E 3.5-4.9 ABBAA Pakistan
O: 9APR2021 05:54:46 42.6N 79.8E mb=4.1 EMSC EASTERN KAZAKHSTAN
P: 5APR2021 132719 42.0N 82.0E 4.0-5.4 BABAA Kirgizstan/Xinjiang
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 8APR2021 17:48:57 1.1N 124.2E ML=4.0 EMSC MINAHASA, SULAWESI, INDONESIA
P: 9APR2021 132574 1.0N 124.0E 4.0-5.6 AAAAA Mindanao, Philippines
O: 8APR2021 17:40:41 3.8N 95.8E mb=4.4 EMSC OFF W COAST OF NORTHERN SUMATR
P: 7APR2021 132576 4.0N 96.0E 4.0-5.8 AAAAA Nicobar Islands
O: 9APR2021 04:59:07 4.3N 126.2E ML=4.3 EMSC KEPULAUAN TALAUD, INDONESIA
P: 10APR2021 132574 6.0N 126.0E 4.0-5.4 ABAAA Mindanao, Philippines
O: 9APR2021 06:42:46 7.7S 127.7E ML=4.5 EMSC KEPULAUAN BARAT DAYA, INDONESI
P: 5APR2021 132580 6.0S 128.0E 4.0-5.4 BBAAA Banda Sea
O: 8APR2021 21:40:57 10.4S 113.6E ML=4.1 EMSC SOUTH OF JAVA, INDONESIA
P: 7APR2021 132592 9.0S 110.0E 4.0-5.4 ABCAA So. of Java
No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.
CENTRAL AND SOUTH AMERICA
O: 9APR2021 06:53 29.7S 69.8W mb=4.5 GUC Coquimbo at La Higuera; III in
P: 7APR2021 132812 31.0S 70.0W 4.0-5.8 AAAAA Central Chile
GUC reported this earthquake was felt with intensity IV in Coquimbo at La Higuera; III in Andacollo, Paiguano and II in Rio Hurtado and in Atacama with III in San Felix, El Transito, Conay, Alto del Carmen and Vallenar, Chile.
O: 9APR2021 02:02 33.8S 70.3W mb=4.6 GUC O'Higgins at Codegua, Graneros
P: 4APR2021 132813 33.0S 71.0W 4.0-5.8 BAAAA Central Chile
GUC reported this earthquake was felt with intensity IV in O'Higgins at Codegua, Graneros, La Estrella, Machale, Mostazal, Rancagua,Rengo, San Fernando; III in Marchihue,and II in Chimbarongo; in Maujle with III in Rauco, II in Constitucion, Curico, Hualane and Sagrada Familia; in Santiago with IV in Curacavi; III in El Monte, Pedro Aguirre Cerda and Santiago and II in Puente Alto and San Jose de Maipo; and in Valparaiso with III in Quilotta and II in Olmue and San Antonio, Chile.
O: 8APR2021 21:40:57 10.4S 113.6E ML=4.1 EMSC SOUTH OF JAVA, INDONESIA
P: 7APR2021 132592 9.0S 110.0E 4.0-5.4 ABCAA So. of Java
O: 8APR2021 07:59:43 7.5S 74.6W mb=4.3 EMSC NORTHERN PERU
P: 10APR2021 132589 6.0S 79.0W 4.0-5.4 ABCAA No. Peru
O: 8APR2021 09:08:29 1.4S 80.4W ML=4.4 EMSC NEAR COAST OF ECUADOR
P: 9APR2021 132583 1.0S 81.0W 4.0-5.4 AAAAA Ecuador
O: 08APR2021 23:28:11 15.0N 94.5W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
O: 09APR2021 02:32:17 15.5N 94.9W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO
O: 08APR2021 07:01:28 16.5N 95.2W ML=4.1 EMSC OAXACA, MEXICO
O: 08APR2021 10:18:00 16.5N 95.7W ML=4.2 EMSC OAXACA, MEXICO
O: 8APR2021 17:59:19 14.7N 93.4W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
P: 9APR2021 132604 14.0N 94.0W 3.5-5.3 AAAAA Chiapas, Mexico
O: 8APR2021 22:12:07 17.4N 68.7W ML=3.5 EMSC DOMINICAN REPUBLIC REGION
P: 6APR2021 132622 18.0N 67.0W 3.4-5.1 AABAA Puerto Rico
O: 8APR2021 17:00:14 18.0N 97.6W ML=4.4 EMSC OAXACA, MEXICO
P: 6APR2021 132621 17.0N 98.0W 3.5-5.2 AAAAA Oaxaca, Mexico
O: 8APR2021 09:08:13 18.5N 69.0W ML=3.0 EMSC DOMINICAN REPUBLIC
O: 09APR2021 02:32:05 18.8N 69.6W ML=3.3 EMSC DOMINICAN REPUBLIC
P: 8APR2021 132623 19.0N 71.0W 3.4-5.2 AABAA Puerto Rico
O: 9APR2021 06:53:19 29.7S 69.7W Mw=4.3 EMSC SAN JUAN, ARGENTINA
P: 6APR2021 132798 29.0S 68.0W 4.0-5.6 BABAA Argentina
P: 7APR2021 132812 31.0S 70.0W 4.0-5.8 ABAAA Central Chile
O: 9APR2021 02:02:09 33.8S 70.3W mb=4.8 EMSC REGION METROPOLITANA, CHILE
P: 4APR2021 132813 33.0S 71.0W 4.0-5.8 BAAAA Central Chile
AFRICA AND EUROPE
O: 8APR2021 15:23:06 36.4N 27.1E mb=4.2 EMSC DODECANESE IS.-TURKEY BORDER R
P: 8APR2021 132648 37.0N 27.0E 3.0-4.6 AAAAA Aegean Sea
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.
OCEAN RIDGES
O: 8APR2021 10:25:14 34.8S 108.0W mb=4.5 EMSC SOUTHERN EAST PACIFIC RISE
No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.
ZEALANDIA AND AUSTRALIA REGION
O: 8APR2021 12:19:49 28.8S 176.6W mb=4.6 EMSC KERMADEC ISLANDS REGION
P: 9APR2021 132801 28.0S 177.0W 4.0-5.6 AAAAA No. Kermadec Islands
O: 08APR2021 15:07:22 33.0S 179.8E ML=3.5 EMSC SOUTH OF KERMADEC ISLANDS
O: 8APR2021 21:56:57 33.6S 179.8E ML=3.8 EMSC SOUTH OF KERMADEC ISLANDS
P: 5APR2021 132822 33.0S 178.0W 4.0-5.6 BABAA So. Kermadec Islands
O: 08APR2021 22:29:05 37.8S 179.6E ML=3.6 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 9APR2021 03:48:09 37.5S 179.9E ML=3.5 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 5APR2021 132819 38.0S 177.0E 3.0-4.6 BABAA North Island, N.Z.
O: 9APR2021 04:55:52 39.5S 174.9E ML=4.0 EMSC NORTH ISLAND OF NEW ZEALAND
P: 7APR2021 132824 40.0S 175.0E 3.0-4.6 AAAAA North Island, N.Z.
JAPAN AND KURIL ISLANDS
No earthquakes of M>=4 were located in Japan or the Kuril Islands today.
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 9APR2021 01:26:09 32.7N 115.3W Ml=2.0 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 10:49:20 32.8N 115.4W Ml=2.2 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 11:05:09 32.8N 115.4W Ml=2.0 EMSC SOUTHERN CALIFORNIA
O: 09APR2021 03:31:45 32.8N 115.4W ML=2.5 EMSC SOUTHERN CALIFORNIA
O: 09APR2021 03:57:12 32.8N 115.4W ML=2.6 EMSC SOUTHERN CALIFORNIA
O: 09APR2021 04:30:57 32.8N 115.5W Ml=2.0 EMSC SOUTHERN CALIFORNIA
P: 4APR2021 132689 32.9N 115.6W 2.5-4.4 BAAAA So. California
NEIC reported these earthquakes of M 2.8, 2.8 in Southern California were felt with intensity II-III in the area(s) of Southern California at Holtville and in Baja at Puebla.
O: 8APR2021 11:19:38 33.8N 117.0W Ml=2.8 EMSC SOUTHERN CALIFORNIA
O: 9APR2021 00:33:46 33.9N 116.8W ML=2.9 EMSC SOUTHERN CALIFORNIA
P: 8APR2021 132694 34.3N 116.5W 2.5-4.4 AAAAA So. California
NEIC reported this earthquake of M 2.8 in San Jacinto, Southern California was felt with intensity II-III in the area(s) of San Jacinto, Southern California in Nuevo, Hemet, Banning, Sun City, Idyllwild, and Menifee.
NEIC reported this earthquake of M 3.3 in Cabazon, Southern California was felt with intensity II-III in the area(s) of Cabazon, Southern California at White Water, Bannng, Idyllwild, Beaumont, San Jacinto, Palm Springs, Yucaipa, Calimesa.
O: 8APR2021 09:27:03 34.7N 120.5W Ml=2.1 EMSC CENTRAL CALIFORNIA
P: 8APR2021 132695 34.9N 119.0W 2.5-5.1 AABAA So. California
O: 8APR2021 20:51:13 35.6N 117.5W ML=3.3 EMSC SOUTHERN CALIFORNIA
P: 8APR2021 132696 35.8N 117.6W 2.5-4.9 AAAAA So. California
NEIC reported this earthquake of M 3.6 in Ridgecrest, Southern California was felt with intensity II-III in the area(s) of Ridgecrest, Southern California in Trona,Inyokern, Palmdale.
O: 08APR2021 16:59:28 38.2N 117.9W ml=2.1 EMSC NEVADA
O: 8APR2021 14:07:41 38.2N 117.8W ml=2.5 EMSC NEVADA
P: 4APR2021 132654 38.2N 118.8W 2.5-4.6 BAAAA California/Nevada area
O: 8APR2021 20:33:17 38.8N 122.8W Md=2.2 EMSC NORTHERN CALIFORNIA
P: 7APR2021 132662 38.7N 122.7W 2.5-4.6 AAAAA Central California
O: 09APR2021 02:06:57 40.3N 124.9W ML=2.5 EMSC OFFSHORE NORTHERN CALIFORNIA
O: 08APR2021 21:40:53 40.4N 124.5W Md=2.5 EMSC OFFSHORE NORTHERN CALIFORNIA
O: 9APR2021 00:39:31 40.2N 124.2W Md=2.5 EMSC NORTHERN CALIFORNIA
P: 7APR2021 132732 40.6N 124.9W 2.5-4.5 AAAAA Off Coast of No. Calif
O: 9APR2021 05:19:49 41.3N 116.2W ML=3.4 EMSC NEVADA
P: 2APR2021 132712 40.0N 117.9W 2.5-4.8 CBBAA California/Nevada area
ALASKA
O: 8APR2021 15:02:47 52.9N 173.4W mb=4.2 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
P: 8APR2021 132752 51.2N 174.4W 3.5-4.9 ABAAA Andreanoff Isls, Aleutians
O: 8APR2021 17:10:18 63.2N 148.7W Mw=5.5 EMSC CENTRAL ALASKA
P: 4APR2021 132771 63.0N 148.6W 3.2-5.0 BAAAA Central Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 8APR2021 19:10:18 50.0N 115.0W Ml=2.8 EMSC BRITISH COLUMBIA, CANADA
P: 3APR2021 132748 52.0N 115.0W 2.0-4.3 BBAAA Alberta
ROCKY MOUNTAINS REGION
O: 8APR2021 16:32:05 31.7N 104.4W ML=3.1 EMSC WESTERN TEXAS
P: 7APR2021 132687 32.6N 104.6W 2.0-3.9 AAAAA SW U.S.A
O: 08APR2021 08:43:28 44.5N 115.2W ML=2.3 EMSC SOUTHERN IDAHO
O: 08APR2021 19:16:26 45.9N 115.2W Ml=2.1 EMSC NORTHERN IDAHO
O: 8APR2021 13:54:06 44.3N 115.2W Ml=2.1 EMSC SOUTHERN IDAHO
P: 6APR2021 132723 44.4N 115.1W 2.0-4.2 AAAAA Montana/Idaho
EASTERN U.S./CANADA
O: 8APR2021 08:49:53 47.7N 69.9W MB=2.0 ECAN Charlevoix Seismic Zone
P: 10APR2021 132721 47.0N 70.0W 2.0-3.9 AAAAA Maine
O: 8APR2021 00:11:18 49.3N 90.9W MB=2.2 ECAN Atikokan, ON
O: 7APR2021 23:10:41 46.6N 76.0W MB=2.2 ECAN Maniwaki, QC
P: 5APR2021 132728 45.0N 75.0W 2.0-4.0 ABAAA New York State
O: 09APR2021 00:03:09 35.1N 95.3W ML=2.2 EMSC OKLAHOMA
O: 08APR2021 18:33:40 35.2N 95.3W ML=2.8 EMSC OKLAHOMA
O: 08APR2021 22:10:28 35.2N 95.3W ML=2.1 EMSC OKLAHOMA
O: 8APR2021 07:17:45 34.4N 97.5W ML=2.4 EMSC OKLAHOMA
P: 10APR2021 132700 35.0N 97.0W 2.0-4.3 AAAAA Southern Plains
NEIC reported this earthquake of M 2.5 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma at Kinta.
O: 8APR2021 17:43:33 29.2N 97.7W mb=2.7 EMSC SOUTHERN TEXAS
HAWAII
NEIC reported an earthquake of M 3.0 in Hawaii was felt with intensity II-III in the area(s) of Hawaii at Volcano.
NORTHERN KERMADEC ISLANDS REMAINS ACTIVE
EARTHQUAKE SUMMARY FOR APRIL 7, 2021
The region of the northern Kermadec Islands remained at active seismic conditions today with several events near M 6.0 and a number of other aftershocks of M>5 of the M 8.1 of March 4, 2021 occurring today. This active was not reported felt in this remote area. As it occurred near the geomagnetic equator, it may have been enhanced by today's strong geomagnetic storm. While an M 6.0 hit in the central Kermadec Islands on April 1, 2021, today's event of M 6.0 in the strongest in the northern Kermadec Islands since immediate aftershocks of the mainshock of March 4 up to about March 6. Forecast 132801 had expected today's activity within about 100 km in the northern Kermadecs was likely around April 6.
O: 07APR2021 19:58:40 28.8S 176.7W mb=4.8 EMSC KERMADEC ISLANDS REGION
O: 07APR2021 13:34:56 28.9S 176.5W mb=5.2 EMSC KERMADEC ISLANDS REGION
O: 07APR2021 19:43:00 28.9S 176.5W Mw=5.6 EMSC KERMADEC ISLANDS REGION
O: 07APR2021 09:53:29 29.0S 176.6W Mw=6.0 EMSC KERMADEC ISLANDS REGION
O: 07APR2021 18:48:05 29.0S 176.7W Mw=5.8 EMSC KERMADEC ISLANDS REGION
O: 07APR2021 10:26:51 29.1S 176.6W Mw=5.2 EMSC KERMADEC ISLANDS REGION
O: 07APR2021 13:15:37 29.1S 176.7W Mw=5.1 EMSC KERMADEC ISLANDS REGION
O: 08APR2021 01:00:39 29.1S 176.4W mb=5.4 EMSC KERMADEC ISLANDS REGION
O: 7APR2021 10:42:05 28.8S 176.7W Mw=5.4 EMSC KERMADEC ISLANDS REGION
P: 6APR2021 132801 28.0S 176.0W 4.0-5.6 AAAAA No. Kermadec Islands
An unusual earthquake of M 4.5 in the Caribbean Sea north of Colombia occurred today. NEIC reported this earthquake of M 4.5 north of Colombia was felt with intensity II-III in the area(s) of Providencia, Colombia. The last earthquake within about 200 km of this epicenter with larger magnitude than today's M 4.5 occurred as an M 6.0 and aftershocks on November 25, 2018. Today's event is probably an aftershock of that event. Forecast 132603 had expected today's activity to the southwest around April 5. This epicenter is at 102 degrees from the M 8.1 in the Kermadec Islands and was probably promoted by energy from that source.
O: 7APR2021 10:46:01 13.1N 81.3W mb=4.5 EMSC CARIBBEAN SEA
P: 5APR2021 132603 10.0N 84.0W 3.5-5.5 ACCAA Caribbean Sea
The strongest earthquake in the U.S. or Canada today was an M 4.9 in the western Fox Islands, Aleutians, Alaska. It was not reported felt in this remote area. This is the strongest earthquake in the Fox Islands in the past four months - since an M 6.4 on December 1, 2020 about 50 km to the east of today's epicenter. Forecast 132755 had expected today's event was likely in this area of the Fox Islands around April 4. Seismicity in Alaska has been quiet in recent weeks and today's event may preceded enhanced regional seismicity associated with the strong geomagnetic storm at high latitudes which reached maximum near this time. This summary had noted this geomagnetic storm as:
"The geomagnetic field saw active today. The AP level was 17. High latitude geomagnetic field saw stormy conditions with AP 35. Strong geomagnetic storms such as this can promote enhanced seismicity in the high latitudes and near the geomagnetic equator and this is likely in the next three days." (April 7-8, 2021)
O: 7APR2021 19:31:58 52.6N 169.2W mb=4.9 EMSC FOX ISLANDS, ALEUTIAN ISLANDS
P: 4APR2021 132755 53.7N 167.0W 3.5-5.2 BBBAA Fox Islands, Aleutians
A series of earthquakes of M>=3 occurred today in the western U.S. This was
a considerable enhancement of regional seismicity associated with today's geomagnetic storm. It included events in Hawaii (M 3.0, 3.0); Arizona (M 3.3); Idaho (M 3.2); northern Utah (M 3.0); off the coast of Oregon (M 3.1);
Northern Nevada (M 3.2); Central California (M 3.3); southern California (M 3.6); Oklahoma (M 3.8); Baja/Southern California (M 3.5). Most of this activity was lightly felt near the epicenter and had been expected in early April in the forecasts of this summary. The most active of these was the region of Southern California near the Baja California border where a series of light earthquakes accompanied the M 3.5. NEIC reported these earthquakes of M 3.5 and 3.7 in Southern California near the Baja border was felt with intensity II-III in the area(s) of Southern California near the Baja border in Heber (IV), Holtville, Calexico, Mexicali, El Centro, Imperial, Brawley, and Palm Springs. Forecast 132689 had expected this activity was likely within about 15 km in early April.
O: 08APR2021 02:00:40 32.8N 115.5W Ml=2.4 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 02:08:32 32.8N 115.5W ML=2.6 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 02:41:51 32.8N 115.4W Ml=2.2 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 03:28:50 32.8N 115.5W ML=2.8 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 03:38:12 32.8N 115.4W Ml=2.1 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 03:52:07 32.8N 115.5W ML=3.5 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 04:12:54 32.8N 115.5W Ml=2.1 EMSC SOUTHERN CALIFORNIA
O: 8APR2021 03:57:46 32.7N 115.4W ML=2.5 EMSC SOUTHERN CALIFORNIA
P: 4APR2021 132689 32.9N 115.6W 2.5-4.4 BAAAA So. California
O: 8APR2021 03:02:54 19.3N 155.5W ML=3.0 EMSC ISLAND OF HAWAII, HAWAII
O: 8APR2021 05:47:27 20.5N 156.0W ML=3.0 EMSC MAUI REGION, HAWAII
P: 7APR2021 132633 20.1N 156.1W 4.0-5.7 AAAAA Hawaii area
O: 7APR2021 09:20:59 35.2N 111.6W ML=3.3 EMSC ARIZONA
P: 4APR2021 132705 37.0N 111.8W 2.0-3.9 BBAAA Utah area
NEIC reported this earthquake of M 3.3 in Arizona was felt with intensity II-III in the area(s) of Arizona at Flagstaff, Prescott, Phoenix (IV), Peoria, Apache Junction, and Yuma.
O: 8APR2021 05:45:29 37.8N 113.0W ML=3.0 EMSC UTAH
P: 6APR2021 132705 37.7N 113.9W 2.0-4.0 AAAAA Utah area
NEIC reported this earthquake of M 3.0 in Utah was felt with intensity II-III in the area(s) of Utah in Brian Head and Cedar City.
O: 07APR2021 17:07:33 44.4N 115.2W Ml=3.2 EMSC SOUTHERN IDAHO
P: 6APR2021 132723 44.4N 115.1W 2.0-4.2 AAAAA Montana/Idaho
O: 7APR2021 09:40:05 44.2N 129.3W ML=3.1 EMSC OFF COAST OF OREGON
P: 6APR2021 132733 44.5N 129.8W 3.0-4.7 AAAAA Off Coast of Oregon
O: 7APR2021 13:17:30 40.9N 117.2W ml=3.2 EMSC NEVADA
P: 2APR2021 132712 40.0N 117.9W 2.5-4.8 BAAAA California/Nevada area
NEIC reported this earthquake of M 3.2 in Northern Nevada was felt with intensity II-III in the area(s) of Northern Nevada at Golconda.
O: 7APR2021 20:18:17 36.7N 120.7W ML=3.3 EMSC CENTRAL CALIFORNIA
P: 6APR2021 132658 36.2N 120.8W 2.5-4.9 AAAAA Central California
O: 7APR2021 13:42:05 35.6N 117.4W Ml=3.6 EMSC SOUTHERN CALIFORNIA
P: 8APR2021 132696 35.8N 117.6W 2.5-4.9 AAAAA So. California
NEIC reported this earthquake of M 3.6 in Southern California was felt with intensity II-III in the area(s) of Southern California at Trona (IV), Ridgecrest, Inyokern, Bodfish, Simi Valley.
O: 7APR2021 16:51:49 35.1N 96.3W ML=3.8 EMSC OKLAHOMA
P: 6APR2021 132700 36.0N 97.0W 2.0-4.1 AAAAA Southern Plains
NEIC reported this earthquake of M 3.2-3.8 in Oklahoma was felt with intensity IV-V in the area(s) of Oklahoma at Union City, Minco, and II-III in Mustang, Tuttle, El Reno, Norman and Oklahoma City.
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 7APR2021 13:19:36 23.8N 121.5E ML=4.9 EMSC TAIWAN
O: 7APR2021 13:19:36 23.8N 121.5E ML=4.9 TAI Hualien, Taiwan
P: 9APR2021 132644 23.0N 121.0E 4.0-5.6 AAAAA Taiwan
GUC reported this event was felt with intensity IV in Hualien; III in Taitung and Nantou; II in Yilan, Changhua, Yunlin and I in Taipei, Chiayi, Miaoli and Tainan, Counties, Taiwan.
O: 7APR2021 16:28:44 24.4N 122.0E ML=4.3 TAI Hualien, Taiwan
O: 8APR2021 00:26:21 24.7N 122.0E ML=4.5 TAI Hualien, Taiwan
P: 5APR2021 132644 23.0N 122.0E 4.0-5.4 AAAAA Taiwan
CWB reported the M 4.5 was felt with intensity II in Yilan and Hsinchu County, and I in Taipei, Tayuan, Hualien, Nantou, Miaoli Counties, Taiwan.
The M 4.3 was felt with intensity II in Yilan, and I in Hualien, Taipei, Nantou and Taipei Counties.
O: 8APR2021 04:17:21 54.7N 163.2E mb=4.3 EMSC OFF EAST COAST OF KAMCHATKA
P: 5APR2021 132754 54.0N 162.0E 4.0-5.8 BAAAA E. of Kamchatka
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 7APR2021 15:50:18 0.6N 98.4E mb=4.2 EMSC NIAS REGION, INDONESIA
P: 9APR2021 132577 0.0N 99.0E 4.0-5.4 AAAAA So. Sumatera
O: 7APR2021 12:47:07 1.3N 121.8E ML=4.2 EMSC MINAHASA, SULAWESI, INDONESIA
O: 8APR2021 05:26:53 2.9N 122.5E Mw=5.0 EMSC CELEBES SEA
P: 9APR2021 132574 1.0N 124.0E 4.0-5.6 AABAA Mindanao, Philippines
O: 8APR2021 02:26:31 3.2N 126.7E ML=4.2 EMSC KEPULAUAN TALAUD, INDONESIA
P: 8APR2021 132572 4.0N 128.0E 4.0-5.6 AABAA Halmahera
O: 8APR2021 00:57:57 3.8N 128.5E ML=4.5 EMSC NORTH OF HALMAHERA, INDONESIA
P: 8APR2021 132572 4.0N 128.0E 4.0-5.6 AAAAA Halmahera
O: 7APR2021 11:50:16 5.7S 127.8E ML=4.5 EMSC BANDA SEA
P: 5APR2021 132580 6.0S 128.0E 4.0-5.4 AAAAA Banda Sea
O: 8APR2021 01:49:03 6.6S 104.6E ML=4.6 EMSC SUNDA STRAIT, INDONESIA
P: 9APR2021 132592 7.0S 105.0E 4.0-5.5 AAAAA So. of Java
O: 7APR2021 23:50:34 6.7S 129.8E mb=4.6 EMSC BANDA SEA
P: 9APR2021 132600 5.0S 130.0E 4.0-5.5 ABAAA West Irian, PNG
CENTRAL AND SOUTH AMERICA
O: 7APR2021 17:51:30 9.3N 83.8W ML=4.3 EMSC COSTA RICA
P: 5APR2021 132603 10.0N 84.0W 3.5-5.5 AAAAA Caribbean Sea
O: 7APR2021 21:18:38 10.8S 78.0W mb=4.2 EMSC NEAR COAST OF CENTRAL PERU
P: 4APR2021 132589 9.0S 81.0W 4.0-5.8 BBCAA No. Peru
O: 7APR2021 10:46:01 13.1N 81.3W mb=4.5 EMSC CARIBBEAN SEA
P: 5APR2021 132603 10.0N 84.0W 3.5-5.5 ACCAA Caribbean Sea
O: 8APR2021 06:24:53 15.6N 93.5W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
P: 8APR2021 132605 16.0N 93.0W 3.5-5.3 AAAAA Chiapas, Mexico
O: 7APR2021 19:33:14 16.2S 70.4W ML=4.0 EMSC SOUTHERN PERU
P: 3APR2021 132792 16.0S 71.0W 4.0-5.7 BAAAA So. Peru/Bolivia
O: 7APR2021 18:51:58 16.2N 95.6W ML=4.1 EMSC OAXACA, MEXICO
O: 7APR2021 10:30:26 16.4N 95.1W ML=4.0 EMSC OAXACA, MEXICO
O: 08APR2021 04:26:08 17.6N 94.7W ML=4.2 EMSC VERACRUZ, MEXICO
O: 7APR2021 15:49:14 17.6N 94.4W mb=4.3 EMSC VERACRUZ, MEXICO
P: 5APR2021 132605 17.0N 95.0W 3.5-5.3 AAAAA Chiapas, Mexico
O: 8APR2021 01:19:41 19.3N 100.4W mb=4.6 EMSC MICHOACAN, MEXICO
P: 5APR2021 132621 19.0N 99.0W 3.5-5.3 BAAAA Oaxaca, Mexico
O: 7APR2021 21:28:20 23.2S 67.1W ML=4.2 EMSC JUJUY, ARGENTINA
O: 7APR2021 08:12:34 24.1S 66.9W mb=4.1 EMSC SALTA, ARGENTINA
P: 5APR2021 132797 24.0S 68.0W 4.0-5.8 AAAAA Argentina
O: 7APR2021 23:14:26 36.4S 70.9W mb=4.6 EMSC MAULE, CHILE
P: 5APR2021 132814 36.0S 71.0W 4.0-5.7 AAAAA Central Chile
NEIC reported this earthquake of M 4.6 in Maule, Chile was felt with intensity II-III in the area(s) of Maule, Chile at Vina del Mar.
AFRICA AND EUROPE
O: 7APR2021 23:06:18 12.8S 45.7E ML=3.3 EMSC MAYOTTE REGION
P: 4APR2021 132787 12.0S 45.0E 3.0-4.6 BAAAA Madagascar area
O: 8APR2021 00:21:48 28.6N 15.1W ML=2.1 EMSC CANARY ISLANDS, SPAIN REGION
P: 9APR2021 132630 28.0N 16.0W 3.0-4.4 AAAAA Canary Islands
O: 07APR2021 21:54:56 36.5N 27.2E mb=4.0 EMSC DODECANESE IS.-TURKEY BORDER REG
O: 07APR2021 22:35:05 36.5N 27.1E mb=4.0 EMSC DODECANESE IS.-TURKEY BORDER REG
O: 8APR2021 00:33:47 36.5N 27.2E mb=4.5 EMSC DODECANESE IS.-TURKEY BORDER R
P: 8APR2021 132648 37.0N 27.0E 3.0-4.6 AAAAA Aegean Sea
NEIC reported this earthquake of M 4.5 in the Dodecanese Islands, Greece was felt with intensity II-III in the area(s) of the Dodecanese Islands, Greece at Kardamaina and Drosia, Greece and in Datca, Turkey.
SOUTHWEST PACIFIC
O: 8APR2021 01:13:47 18.5S 169.4E mb=5.1 EMSC VANUATU
P: 3APR2021 132796 17.0S 168.0E 4.0-5.5 BBBAA Vanuatu Islands
OCEAN RIDGES
No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.
ZEALANDIA AND AUSTRALIA REGION
O: 07APR2021 19:58:40 28.8S 176.7W mb=4.8 EMSC KERMADEC ISLANDS REGION
O: 07APR2021 13:34:56 28.9S 176.5W mb=5.2 EMSC KERMADEC ISLANDS REGION
O: 07APR2021 19:43:00 28.9S 176.5W Mw=5.6 EMSC KERMADEC ISLANDS REGION
O: 07APR2021 09:53:29 29.0S 176.6W Mw=6.0 EMSC KERMADEC ISLANDS REGION
O: 07APR2021 18:48:05 29.0S 176.7W Mw=5.8 EMSC KERMADEC ISLANDS REGION
O: 07APR2021 10:26:51 29.1S 176.6W Mw=5.2 EMSC KERMADEC ISLANDS REGION
O: 07APR2021 13:15:37 29.1S 176.7W Mw=5.1 EMSC KERMADEC ISLANDS REGION
O: 08APR2021 01:00:39 29.1S 176.4W mb=5.4 EMSC KERMADEC ISLANDS REGION
O: 7APR2021 10:42:05 28.8S 176.7W Mw=5.4 EMSC KERMADEC ISLANDS REGION
P: 6APR2021 132801 28.0S 176.0W 4.0-5.6 AAAAA No. Kermadec Islands
O: 7APR2021 17:14:29 35.0S 179.1E ML=3.8 EMSC SOUTH OF KERMADEC ISLANDS
P: 5APR2021 132819 38.0S 177.0E 3.0-4.6 ACBAA North Island, N.Z.
O: 7APR2021 15:07:34 44.9S 167.4E ML=4.0 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 07APR2021 15:07:34 44.8S 167.2E MS=4.1 GEONET Felt with weak to light intensity
P: 4APR2021 132827 45.0S 167.0E 3.0-5.1 BAAAA So. Island, N.Z.
GEONET reported this earthquake was felt with weak to light intensity in the area of Southern South Island, New Zealand. 4 felt reports were published including 3 of weak and 1 of light shaking and 0 of moderate intensity.
JAPAN AND KURIL ISLANDS
O: 7APR2021 19:24:31 24.8N 128.1E mb=4.2 EMSC SOUTHEAST OF RYUKYU ISLANDS
P: 8APR2021 132641 25.0N 127.0E 4.0-5.5 AAAAA Ryukyu Islands
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 08APR2021 02:00:40 32.8N 115.5W Ml=2.4 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 02:08:32 32.8N 115.5W ML=2.6 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 02:41:51 32.8N 115.4W Ml=2.2 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 03:28:50 32.8N 115.5W ML=2.8 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 03:38:12 32.8N 115.4W Ml=2.1 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 03:52:07 32.8N 115.5W ML=3.5 EMSC SOUTHERN CALIFORNIA
O: 08APR2021 04:12:54 32.8N 115.5W Ml=2.1 EMSC SOUTHERN CALIFORNIA
O: 8APR2021 03:57:46 32.7N 115.4W ML=2.5 EMSC SOUTHERN CALIFORNIA
P: 4APR2021 132689 32.9N 115.6W 2.5-4.4 BAAAA So. California
O: 8APR2021 05:48:10 34.2N 117.3W Ml=2.1 EMSC GREATER LOS ANGELES AREA, CALI
P: 8APR2021 132694 34.3N 116.5W 2.5-4.4 AAAAA So. California
O: 7APR2021 19:36:32 34.5N 119.1W Ml=2.2 EMSC SOUTHERN CALIFORNIA
P: 8APR2021 132695 34.9N 119.0W 2.5-5.1 AAAAA So. California
O: 07APR2021 20:41:59 35.1N 117.0W Ml=2.8 EMSC SOUTHERN CALIFORNIA
O: 7APR2021 18:20:03 35.1N 117.0W Ml=2.3 EMSC SOUTHERN CALIFORNIA
P: 7APR2021 132696 35.0N 117.7W 2.5-4.8 AAAAA So. California
NEIC reported this earthquake of M 2.8 in Southern California was felt with intensity II-III in the area(s) of Southern California at Barstow.
O: 7APR2021 13:42:05 35.6N 117.4W Ml=3.6 EMSC SOUTHERN CALIFORNIA
P: 8APR2021 132696 35.8N 117.6W 2.5-4.9 AAAAA So. California
O: 7APR2021 08:02:16 36.0N 117.8W Ml=2.3 EMSC CENTRAL CALIFORNIA
P: 8APR2021 132696 35.8N 117.6W 2.5-4.9 AAAAA So. California
O: 8APR2021 01:03:00 36.6N 121.1W Md=2.5 EMSC CENTRAL CALIFORNIA
O: 7APR2021 20:18:17 36.7N 120.7W ML=3.3 EMSC CENTRAL CALIFORNIA
P: 6APR2021 132658 36.2N 120.8W 2.5-4.9 AAAAA Central California
NEIC reported the earthquake of M 2.5 in Central California was felt with intensity II-III in the area(s) of Central California at Los Banos.
NEIC reported the earthquake of M 3.3 in Central California was felt with intensity II-III in the area(s) of Central California in Firebaugh, Dos Palos and Los Banos.
O: 7APR2021 13:45:36 38.0N 122.1W Md=2.5 EMSC SAN FRANCISCO BAY AREA, CALIF.
P: 3APR2021 132661 37.9N 122.0W 2.5-4.5 BAAAA Central California
NEIC reported this earthquake of M 2.5 in San Francisco, California was felt with intensity II-III in the area(s) of San Francisco, California at Pleasant Hill, Walnut Creek, Lafayette, Martinez, Concord, Alamo and Moraga.
O: 7APR2021 18:10:30 38.1N 117.9W ml=2.0 EMSC NEVADA
P: 4APR2021 132654 38.2N 118.8W 2.5-4.6 BAAAA California/Nevada area
O: 8APR2021 06:38:57 38.2N 117.9W ML=2.5 EMSC NEVADA
P: 8APR2021 132652 37.5N 118.6W 2.5-4.8 AAAAA California/Nevada area
O: 07APR2021 12:13:43 38.8N 122.8W Md=2.5 EMSC NORTHERN CALIFORNIA
O: 07APR2021 12:56:14 38.8N 122.8W ML=2.5 EMSC NORTHERN CALIFORNIA
O: 7APR2021 15:17:18 38.5N 122.6W Md=2.5 EMSC NORTHERN CALIFORNIA
P: 7APR2021 132662 38.7N 122.7W 2.5-4.6 AAAAA Central California
NEIC reported the earthquake of M 2.9 in the Geysers, California was felt with intensity II-III in the area(s) of the Geysers, California at Kelseyville, Middletown, and Calistoga.
NEIC reported the earthquake of M 2.5 in the Geysers, California was felt with intensity II-III in the area(s) of the Geysers, California at Santa Rosa, Calistoga, Sonoma.
O: 7APR2021 07:02:13 40.6N 119.5W ml=2.2 EMSC NEVADA
P: 5APR2021 132712 40.2N 119.6W 2.5-4.6 AAAAA California/Nevada area
O: 7APR2021 13:17:30 40.9N 117.2W ml=3.2 EMSC NEVADA
P: 2APR2021 132712 40.0N 117.9W 2.5-4.8 BAAAA California/Nevada area
O: 7APR2021 14:24:28 41.2N 122.1W Md=2.0 EMSC NORTHERN CALIFORNIA
P: 4APR2021 132731 40.6N 122.4W 2.5-4.6 BAAAA Northern California
ALASKA
O: 7APR2021 19:31:58 52.6N 169.2W mb=4.9 EMSC FOX ISLANDS, ALEUTIAN ISLANDS
P: 4APR2021 132755 53.7N 167.0W 3.5-5.2 BBBAA Fox Islands, Aleutians
O: 7APR2021 09:56:50 59.6N 152.8W ML=3.0 EMSC SOUTHERN ALASKA
P: 5APR2021 132770 60.3N 153.0W 3.2-5.0 AAAAA Central Alaska
O: 7APR2021 11:46:24 63.3N 150.5W ML=3.0 EMSC CENTRAL ALASKA
P: 7APR2021 132770 63.2N 151.4W 3.2-5.1 AAAAA Central Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 7APR2021 09:40:05 44.2N 129.3W ML=3.1 EMSC OFF COAST OF OREGON
P: 6APR2021 132733 44.5N 129.8W 3.0-4.7 AAAAA Off Coast of Oregon
ROCKY MOUNTAINS REGION
O: 7APR2021 09:20:59 35.2N 111.6W ML=3.3 EMSC ARIZONA
P: 4APR2021 132705 37.0N 111.8W 2.0-3.9 BBAAA Utah area
O: 7APR2021 11:09:13 37.0N 105.0W ML=2.7 EMSC COLORADO
P: 5APR2021 132665 36.9N 105.1W 2.0-4.1 AAAAA Colorado area
O: 8APR2021 05:45:29 37.8N 113.0W ML=3.0 EMSC UTAH
P: 6APR2021 132705 37.7N 113.9W 2.0-4.0 AAAAA Utah area
O: 07APR2021 17:07:33 44.4N 115.2W Ml=3.2 EMSC SOUTHERN IDAHO
O: 07APR2021 14:24:23 44.6N 114.7W Ml=2.1 EMSC SOUTHERN IDAHO
O: 7APR2021 12:32:22 44.3N 115.2W Ml=2.8 EMSC SOUTHERN IDAHO
P: 6APR2021 132723 44.4N 115.1W 2.0-4.2 AAAAA Montana/Idaho
O: 7APR2021 10:35:03 45.1N 111.8W Ml=2.5 EMSC WESTERN MONTANA
P: 9APR2021 132746 45.6N 111.9W 2.0-4.3 AAAAA Yellowstone/Wyoming
EASTERN U.S./CANADA
O: 7APR2021 16:51:49 35.1N 96.3W ML=3.8 EMSC OKLAHOMA
O: 7APR2021 12:29:13 35.2N 95.3W ML=2.2 EMSC OKLAHOMA
P: 6APR2021 132700 36.0N 97.0W 2.0-4.1 AAAAA Southern Plains
O: 7APR2021 12:29:13 35.2N 95.3W ML=2.2 EMSC OKLAHOMA
P: 8APR2021 132699 34.0N 96.0W 2.0-4.0 ABAAA Southern Plains
O: 7APR2021 09:08:01 46.9N 77.6W MB=1.8 ECAN Deep River, ON
P: 5APR2021 132728 45.0N 75.0W 2.0-4.0 AABAA New York State
O: 07APR2021 05:46:13 46.9N 76.5W MB=1.9 ECAN Maniwaki, QC
O: 6APR2021 23:24:11 46.3N 75.9W MB=1.8 ECAN Maniwaki, QC
P: 5APR2021 132728 45.0N 75.0W 2.0-4.0 ABAAA New York State
O: 07APR2021 07:43:02 50.1N 60.8W MB=2.2 ECAN La Romaine, QC
O: 7APR2021 01:36:34 50.1N 60.8W MB=2.2 ECAN La Romaine, QC
P: 4APR2021 132715 49.0N 66.0W 2.0-4.0 BBCAA E. of Maine
O: 6APR2021 08:13:46 49.1N 66.9W MB=2.0 ECAN Cap-Chat, QC
P: 4APR2021 132715 49.0N 66.0W 2.0-4.0 AAAAA E. of Maine
O: 06APR2021 07:59:02 47.4N 70.5W MB=1.0 ECAN Charlevoix Seismic Zone
O: 6APR2021 08:29:24 47.7N 69.9W MB=1.6 ECAN Charlevoix Seismic Zone
P: 3APR2021 132721 47.0N 69.0W 2.0-3.9 BAAAA Maine
HAWAII
O: 8APR2021 03:02:54 19.3N 155.5W ML=3.0 EMSC ISLAND OF HAWAII, HAWAII
P: 9APR2021 132610 19.9N 156.1W 3.0-4.7 AAAAA Hawaii
O: 8APR2021 05:47:27 20.5N 156.0W ML=3.0 EMSC MAUI REGION, HAWAII
P: 7APR2021 132633 20.1N 156.1W 4.0-5.7 AAAAA Hawaii area
MODERATELY STRONG QUAKE IN NEW IRELAND, P.N.G.
EARTHQUAKE SUMMARY FOR APRIL 6, 2021
The strongest earthquake in the world today was an M 5.6 in New Ireland, Papua New Guinea. It was probably lightly felt in the New Ireland area. This is the strongest earthquake in the area of New Ireland within about 200 km of this epicenter since an M 6.1 on May 7, 2020. Forecast 132587 had expected today's event in this area was likely around April 6.
O: 7APR2021 05:13:16 3.6S 153.9E Mw=5.6 EMSC NEW IRELAND REGION, P.N.G.
P: 6APR2021 132587 5.0S 153.0E 4.0-5.5 ABAAA New Britain
A series of aftershocks of M 5.3 each occurred today in the northern Kermadec Islands, New Zealand. This area had been declining in seismicity over the past several days and today's activity may be related to the M 6.0 north of North Island, New Zealand which occurred yesterday. An M 6.5 hit the area on April 1, 2021, the first of M>=5.3 in the area since March 15, 2021. Today's activity was not reported felt in this remote area. Forecast 132802 had expected today's activity within about 50 km was likely around April 5.
O: 06APR2021 07:37:22 29.0S 176.7W mb=5.3 EMSC KERMADEC ISLANDS REGION
O: 06APR2021 08:16:14 29.5S 176.8W mb=5.3 EMSC KERMADEC ISLANDS REGION
O: 6APR2021 10:07:46 29.7S 176.6W mb=5.3 EMSC KERMADEC ISLANDS REGION
P: 5APR2021 132802 29.0S 176.0W 4.0-5.4 AAAAA No. Kermadec Islands
The strongest earthquake in the U.S. or Canada today was an M 4.2 in the central Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. This is the strongest earthquake within about 150 km of this epicenter since an M 5.0 on December 16, 2020 when an M 5.0 occurred north west of today's epicenter. Forecast 132749 had expected today's event in this area was likely around April 4, 2021. This event is near the antipode of the M 6.6 of April 3 in the South Atlantic Ocean and may have been promoted by energy from that source.
O: 6APR2021 09:02:13 50.8N 177.3W mb=4.2 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
P: 4APR2021 132749 51.6N 177.6W 3.5-4.9 AAAAA Andreanoff Isls, Aleutians
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 6APR2021 09:01:19 27.0N 89.3E ML=3.9 EMSC INDIA-BANGLADESH BORDER REGION
P: 8APR2021 132638 27.0N 88.0E 3.5-5.4 AAAAA Nepal
O: 6APR2021 21:48:35 32.0N 93.1E Mw=5.0 EMSC EASTERN XIZANG
P: 29MAR2021 132436 33.0N 92.0E 3.8-5.2 CAAAA Xizang
O: 6APR2021 17:22:17 35.2N 59.3E mb=4.4 EMSC NORTHEASTERN IRAN
P: 1APR2021 132649 33.0N 60.0E 3.8-5.4 BCAAA Afghanistan
O: 6APR2021 15:12:25 35.5N 46.2E Mw=5.3 EMSC IRAN-IRAQ BORDER REGION
P: 4APR2021 132679 36.0N 46.0E 3.8-5.5 AAAAA No. Iran
NEIC reported this earthquake of M 5.3 in Iraq was felt with intensity II-III in the area(s) of Baynjiway, Iraq.
O: 6APR2021 15:39:18 47.9N 145.9E mb=4.1 EMSC SEA OF OKHOTSK
P: 7APR2021 132716 42.0N 145.0E 3.5-5.5 ACAAA Hokkaido, Japan
O: 06APR2021 21:55:47 32.0N 93.1E mb=4.8 EMSC EASTERN XIZANG
O: 06APR2021 22:01:09 32.1N 93.1E mb=4.1 EMSC XIZANG-QINGHAI BORDER REGION
INDONESIA AND PHILIPPINES
O: 6APR2021 21:44:21 0.1S 124.4E ML=4.3 EMSC MOLUCCA SEA
P: 7APR2021 132595 1.0S 122.0E 4.0-5.6 AACAA Sulawesi area
P: 9APR2021 132574 1.0N 124.0E 4.0-5.6 BBAAA Mindanao, Philippines
O: 6APR2021 17:40:19 3.6S 138.7E mb=4.6 EMSC PAPUA, INDONESIA
P: 9APR2021 132598 2.0S 139.0E 4.0-5.5 BBAAA West Irian, PNG
O: 6APR2021 20:08:48 5.9N 126.5E mb=5.1 EMSC MINDANAO, PHILIPPINES
P: 9APR2021 132573 6.0N 127.0E 4.0-5.8 BAAAA Halmahera
O: 6APR2021 20:17:30 6.3S 130.2E ML=4.6 EMSC BANDA SEA
P: 5APR2021 132600 6.0S 131.0E 4.0-5.4 AAAAA West Irian, PNG
O: 6APR2021 07:00:54 9.4S 107.1E ML=4.2 EMSC SOUTH OF JAVA, INDONESIA
P: 6APR2021 132793 10.0S 107.0E 4.0-5.4 AAAAA So. of Java
O: 6APR2021 08:23:11 13.1N 143.4E mb=4.6 EMSC GUAM REGION
P: 9APR2021 132624 12.0N 143.0E 4.0-5.6 BBAAA So. Marianas/Guam
CENTRAL AND SOUTH AMERICA
O: 6APR2021 19:36:16 5.7S 80.7W mb=4.8 EMSC NEAR COAST OF NORTHERN PERU
P: 9APR2021 132583 4.0S 80.0W 4.0-5.5 BBAAA Ecuador
P: 10APR2021 132589 6.0S 79.0W 4.0-5.4 BABAA No. Peru
O: 6APR2021 18:01:14 3.6N 83.1W mb=4.7 EMSC OFF COAST OF CENTRAL AMERICA
P: 1APR2021 132571 4.0N 83.0W 4.0-5.8 BAAAA Ecuador
P: 4APR2021 132570 5.0N 83.0W 3.5-5.3 ABAAA Costa Rica
O: 6APR2021 21:33:23 12.2N 87.3W mb=4.2 EMSC NEAR COAST OF NICARAGUA
P: 7APR2021 132617 13.0N 87.0W 3.5-5.8 AAAAA Nicaragua
O: 6APR2021 08:09:35 15.2N 94.6W ML=4.0 EMSC OFF COAST OF OAXACA, MEXICO
P: 8APR2021 132605 16.0N 93.0W 3.5-5.3 ABBAA Chiapas, Mexico
P: 9APR2021 132604 14.0N 94.0W 3.5-5.3 BBAAA Chiapas, Mexico
O: 6APR2021 18:43:58 15.5N 95.5W ML=4.1 EMSC OFFSHORE OAXACA, MEXICO
P: 6APR2021 132620 15.0N 96.0W 3.5-5.2 AAAAA Oaxaca, Mexico
O: 6APR2021 15:28:30 17.2N 95.8W ML=4.0 EMSC OAXACA, MEXICO
P: 5APR2021 132605 17.0N 95.0W 3.5-5.3 AAAAA Chiapas, Mexico
O: 6APR2021 18:53:27 19.5N 70.1W ML=3.0 EMSC DOMINICAN REPUBLIC
P: 4APR2021 132628 20.0N 71.0W 3.0-4.6 AAAAA Bahamas/No. Caribbean
O: 06APR2021 09:26:39 24.1S 67.0W mb=4.4 EMSC SALTA, ARGENTINA
O: 7APR2021 02:30:28 23.3S 66.8W Mw=4.2 EMSC JUJUY, ARGENTINA
P: 5APR2021 132797 24.0S 68.0W 4.0-5.8 AAAAA Argentina
O: 7APR2021 02:25:43 31.0S 71.8W mb=4.2 EMSC OFFSHORE COQUIMBO, CHILE
P: 5APR2021 132813 32.0S 71.0W 4.0-5.9 AAAAA Central Chile
O: 6APR2021 17:36:25 24.1S 64.3W ML=4.5 EMSC JUJUY, ARGENTINA
P: 9APR2021 132798 27.0S 63.0W 4.0-5.8 BCAAA Argentina
AFRICA AND EUROPE
O: 7APR2021 02:06:07 41.5N 19.4E mb=4.1 EMSC ADRIATIC SEA
P: 9APR2021 132709 43.0N 18.0E 3.0-4.9 ABAAA Adriatic Sea
O: 6APR2021 08:54:20 45.2N 16.2E mb=4.6 EMSC CROATIA
P: 5APR2021 132717 45.0N 16.0E 3.0-5.1 AAAAA Italy
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 7APR2021 05:13:16 3.6S 153.9E Mw=5.6 EMSC NEW IRELAND REGION, P.N.G.
P: 6APR2021 132587 5.0S 153.0E 4.0-5.5 ABAAA New Britain
OCEAN RIDGES
No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.
ZEALANDIA AND AUSTRALIA REGION
O: 6APR2021 12:40:26 29.6S 178.4W mb=4.8 EMSC KERMADEC ISLANDS, NEW ZEALAND
P: 5APR2021 132821 31.0S 178.0W 4.0-5.6 ABAAA So. Kermadec Islands
P: 9APR2021 132819 30.0S 178.0W 4.0-5.6 BAAAA No. Kermadec Islands
O: 06APR2021 07:37:22 29.0S 176.7W mb=5.3 EMSC KERMADEC ISLANDS REGION
O: 06APR2021 08:16:14 29.5S 176.8W mb=5.3 EMSC KERMADEC ISLANDS REGION
O: 6APR2021 10:07:46 29.7S 176.6W mb=5.3 EMSC KERMADEC ISLANDS REGION
P: 5APR2021 132802 29.0S 176.0W 4.0-5.4 AAAAA No. Kermadec Islands
O: 6APR2021 14:19:16 37.4S 179.9E ML=3.5 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 5APR2021 132819 38.0S 177.0E 3.0-4.6 AABAA North Island, N.Z.
JAPAN AND KURIL ISLANDS
O: 6APR2021 12:20:30 37.4N 141.6E ML=3.5 EMSC NEAR EAST COAST OF HONSHU, JAP
P: 7APR2021 132683 38.0N 140.0E 4.0-5.6 AAAAA Off East Coast Honshu
O: 6APR2021 20:10:36 38.2N 142.2E mb=4.2 EMSC NEAR EAST COAST OF HONSHU, JAP
P: 7APR2021 132683 38.0N 140.0E 4.0-5.6 AABAA Off East Coast Honshu
O: 6APR2021 16:44:15 43.1N 145.6E mb=4.6 EMSC HOKKAIDO, JAPAN REGION
P: 7APR2021 132716 42.0N 145.0E 3.5-5.5 ABAAA Hokkaido, Japan
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 7APR2021 01:57:49 33.1N 115.6W Ml=2.2 EMSC SOUTHERN CALIFORNIA
P: 4APR2021 132689 32.9N 115.6W 2.5-4.4 BAAAA So. California
O: 7APR2021 06:46:08 33.9N 116.7W Ml=2.1 EMSC SOUTHERN CALIFORNIA
P: 6APR2021 132690 33.4N 116.7W 2.5-4.5 AAAAA So. California
O: 6APR2021 20:05:31 34.0N 118.3W Ml=2.3 EMSC GREATER LOS ANGELES AREA, CALI
P: 4APR2021 132693 34.0N 118.7W 2.5-4.8 AAAAA So. California
P: 7APR2021 132693 34.4N 118.6W 2.5-4.9 AAAAA So. California
O: 6APR2021 22:39:33 36.5N 121.1W Md=2.0 EMSC CENTRAL CALIFORNIA
P: 6APR2021 132658 36.2N 120.8W 2.5-4.9 AAAAA Central California
O: 6APR2021 08:24:13 37.2N 114.6W ML=2.9 EMSC NEVADA
P: 6APR2021 132705 37.7N 113.9W 2.0-4.0 AAAAA Utah area
O: 6APR2021 22:54:28 40.6N 119.6W ml=2.2 EMSC NEVADA
P: 5APR2021 132712 40.2N 119.6W 2.5-4.6 AAAAA California/Nevada area
ALASKA
O: 6APR2021 09:02:13 50.8N 177.3W mb=4.2 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
P: 4APR2021 132749 51.6N 177.6W 3.5-4.9 AAAAA Andreanoff Isls, Aleutians
O: 7APR2021 06:35:36 59.9N 153.5W ml=3.3 EMSC SOUTHERN ALASKA
P: 5APR2021 132770 60.3N 153.0W 3.2-5.0 AAAAA Central Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
No events of M>=2 were located in the northwestern U.S. or western Canada today.
ROCKY MOUNTAINS REGION
O: 06APR2021 09:33:43 44.5N 115.2W Ml=2.1 EMSC SOUTHERN IDAHO
O: 06APR2021 14:43:03 44.5N 115.2W Ml=2.4 EMSC SOUTHERN IDAHO
O: 7APR2021 04:42:11 44.3N 115.2W ML=3.2 EMSC SOUTHERN IDAHO
P: 6APR2021 132723 44.4N 115.1W 2.0-4.2 AAAAA Montana/Idaho
O: 6APR2021 19:20:39 41.5N 112.9W Ml=3.5 EMSC UTAH
P: 7APR2021 132706 39.6N 111.9W 2.0-4.0 ABAAA Utah area
NEIC reported this earthquake of M 3.5 in Northern Utah was felt with intensity V in the area(s) of Northern Utah.
EASTERN U.S./CANADA
O: 6APR2021 12:05:19 39.2N 99.2W mb=2.7 EMSC KANSAS
P: 4APR2021 132700 38.0N 99.0W 2.0-4.4 ABAAA Southern Plains
NEIC reported this earthquake of M 2.7 in Kansas was felt with intensity II-III in the area(s) of Kansas at Plainville.
O: 6APR2021 08:13:46 49.1N 66.9W MB=2.0 ECAN Cap-Chat, QC
P: 4APR2021 132715 49.0N 66.0W 2.0-4.0 AAAAA E. of Maine
O: 6APR2021 06:16:25 50.0N 60.8W MB=2.5 ECAN La Romaine, QC
O: 6APR2021 06:03:51 50.0N 60.8W MB=1.6 ECAN La Romaine, QC
P: 4APR2021 132715 49.0N 66.0W 2.0-4.0 AACAA E. of Maine
HAWAII
O: 7APR2021 02:55:39 19.2N 155.4W ML=3.3 EMSC ISLAND OF HAWAII, HAWAII
P: 7APR2021 132633 20.1N 156.1W 4.0-5.7 AAAAA Hawaii area
STRONG AFTERSHOCK IN NEW ZEALAND; SWARM IN LOS ANGELES, CALIFORNIA
EARTHQUAKE SUMMARY FOR APRIL 5, 2021
The strongest earthquake in the world today was an aftershock of M 6.0 north of North Island, New Zealand. NEIC reported it was felt with intensity VI in Gisborne, North Islands, New Zealand at Ruatoria; V in Tolaga Bay, Nuhaka, Hawke's Bay; IV in the Bay of Plenty at Te Kaha, Opotiki and Gisborne and II-III in Turangi, Palmerston North, and Wellington. GEONET reported this event was felt with moderate intensity in North Island, New Zealand with 7826 reports of which 4999 reported weak shaking; 2451 light, 349 moderate, 17 strong, 3 Severe and 7 extreme intensity. This is the strongest aftershock of the M 7.3 off North Island, New Zealand of March 4 since an M 6.0-6.1 on March 6, a month ago. Forecast 132819 had expected today's enhanced activity was likely around April 5.
O: 05APR2021 07:07:43 37.4S 179.9E ML=3.8 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 05APR2021 07:37:53 37.6S 179.5E Mw=6.0 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 05APR2021 07:37:52 37.6S 179.7E ML=6.5 GEONET Felt with moderate intensity
O: 05APR2021 15:20:25 37.7S 179.6E ML=4.1 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 5APR2021 14:00:17 37.4S 179.9E ML=3.6 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 5APR2021 132819 38.0S 177.0E 3.0-4.6 AABAA North Island, N.Z.
An M 4.0-4.1 was widely felt in the region of Los Angeles, California today. NEIC reported maximum intensity IV in the Los Angeles area at Inglewood, with lesser shaking in Gardena, Hawthorne, and as far as central California with lesser shaking. It was associated with smaller foreshocks and aftershocks lightly felt in the area. This activity follows a moderately strong quake of M 5.4 in the Gulf of California yesterday. It has been shown that events in these areas which are on the same faults systems can promote seismicity to the north, as may be the situation in this case. Regional seismicity in California often peaks in April with a spike in mid-month. It has been argued that this is related to regional weather systems in this semi-arid region. For example, the San Francisco earthquake of M 7.8 in April, 1906 was preceded by series of strong earthquakes in mid-April during the previous 30 years. When an M 3.0 hit the region of San Fernando Valley, California west of Los Angeles on February 26, 2021 this summary noted the possibility of tidal triggering as:
"An earthquake of M 3.0 occurred near local solar noon in the Simi Valley west of Los Angeles today. NEIC reported intensity II-III in Simi Valley, Canoga Park, West Hills, Chatsworth, Oak Park, Winnetka, Porter Ranch and Thousand Oaks, California among others. This is the strongest earthquake in the Simi Valley area of California since an M 4.2 and 3.8 on July 30, 2020. It was likely promoted by strong tidal stresses associated with the full moon of February 27 as it occurred within about an hour of local solar noon, a time when tidal stresses area maximized." (February 27, 2021)
and
"Several minutes before the Simi Valley quake an M 3.7 occurred near Ridgecrest in Central California. It was reported to have been lightly felt in that area. It also occurred within minutes of local solar noon and was probably promoted by high tidal stresses with the full moon which maximize near this hour." (February 27, 2021)
Today's activity within about 25 km of an M 4.5 on September 19, 2020 may be aftershocks of that event. The only other event of M>=4.0 in the area in the past seven years was an M 4.2 on July 30, 2020 indicating a return to active conditions for the area in the past year.
A foreshock of M 3.0 was recorded on April 1, 2021. This was probably promoted by high tidal stresses associated with the full moon of March 28. At the time this summary noted:
"NEIC reported this earthquake of M 3.0 in Los Angeles, California was felt with intensity IV in the area(s) of Huntington Park and Maywood, Los Angeles, California." (April 2, 2021)
Forecasts 132691 and 132693 expected this activity within about 30 km was likely around April 3-4.
O: 05APR2021 11:44:00 33.9N 118.3W ML=4.1 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 12:27:47 33.9N 118.3W Ml=2.3 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 12:53:07 33.9N 118.3W Ml=2.3 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 13:19:22 33.9N 118.3W Ml=2.0 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 14:57:54 33.9N 118.3W Ml=2.0 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 21:37:45 33.9N 118.4W Ml=2.2 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 11:47:04 34.0N 118.4W Ml=2.0 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 11:48:40 34.0N 118.3W Ml=2.4 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 12:29:48 34.0N 118.3W Ml=2.4 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 06APR2021 01:10:17 34.0N 118.4W Ml=2.2 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 06APR2021 01:12:21 34.0N 118.3W Ml=2.1 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 5APR2021 11:15:37 33.9N 118.3W ML=3.0 EMSC GREATER LOS ANGELES AREA, CALI
P: 3APR2021 132691 34.2N 117.8W 2.5-4.6 AAAAA So. California
P: 4APR2021 132693 34.0N 118.7W 2.5-4.8 AAAAA So. California
An M 5.1 was widely felt in the region of northern India and Bhutuan today. NEIC reported it was felt with intensity VI in Sikkin at Singtam; V in Gangtok, Mal Bangla, Kalimpong, Mamchi, Dhupguri and in Tshongdue, Bhutan. Intensity IV was felt in Sikkim, India at Rangpo, Odlabari, India and Phuentsholing, Bhutan.
NEIC reported the earthquake of M 3.9 in India-Bangladesh border was felt with intensity II-III in the area(s) of India-Bangladesh border in India at Jalpaiguri, Gangtok and in Dala Bhutan. This is the strongest earthquake within about 200 km of this epicenter since an M 5.3 southeast of this on September 12, 2018 about 200 km away and an M 7.3 about 250 km northwest of this on May 12, 2015. Forecast 132638 had expected today's event was likely around April 8. This epicenter is near 104 degrees from the M 8.1 in the Kermadec Islands of March 4 and may have been promoted by energy from that source.
O: 06APR2021 01:36:55 26.6N 88.6E mb=3.9 EMSC INDIA-BANGLADESH BORDER REGION
O: 5APR2021 15:19:59 27.2N 88.9E Mw=5.1 EMSC SIKKIM, INDIA
P: 8APR2021 132638 27.0N 88.0E 3.5-5.4 BAAAA Nepal
Also in Asia an M 4.7 was recorded in Turkmenistan. This is the strongest earthquake in Turkmenistan since an M 5.2 southeast of today's epicenter on September 26, 2020. That earthquake was also associated with a moderate quake in India -
"Moderate seismicity shook several areas of central Asia today with an M 5.3 in Turkmenistan and several events including an M 5.3 in Kashmir and Jammu, India. Moderate earthquakes of M 4.5-5.0 also occurred in central Asia today in Pakistan, southern China and Hindu Kush, Afghanistan." (September 26, 2020)
and
"The strongest earthquake in the world today was an M 5.2-5.3 in Turkmenistan. It was felt with intensity II-III in northern Iran at Gonbad-e, Kavus and Sherwan, CKhorasan, Shamali. An M 4.7 regional aftershock followed about 200 km northwest of today's M 5.2 of the mainshock and was felt with intensity IV in Balkanabat, Balka, Turkmenistan. The last earthquake of M>=5.2 within about 200 km of the event of M 5.2 today occurred as an M 5.9 on August 22, 2000." (September 26, 2020)
Forecast 132718 had expected today's M 4.7 in Turkmenistan was likely within about 50 km around April 5.
O: 5APR2021 11:33:28 39.5N 54.8E mb=4.7 EMSC TURKMENISTAN
P: 5APR2021 132718 40.0N 55.0E 4.0-5.5 AAAAA Kazakhstan
The series of moderate earthquakes in ocean Ridge areas continued today with reduced magnitudes. These events of moderate magnitude occurred in the southeast Indian Ridge (M 4.8); the South Atlantic aftershock zone of the M 6.6 there (M 5.2) and in the South Shetland Islands (M 4.4).
GUC reported the earthquake in the South Shetland Islands was felt with intensity III in Antartida at Antartida, Base Frei and in Base Fildes, Chile. This earthquake occurred near local solar midnight and may have been promoted by high tidal stresses. The last quake in the South Shetland Islands area of larger magnitude was an M 5.0 on March 28 which occurred with the full moon. Forecast 132834 had expected today's activity was likely within about 100 km around April 5.
O: 6APR2021 01:59 62.4S 58.4W mb=4.2 GUC Antartida at Antartida, Base F
O: 6APR2021 01:59:55 62.2S 58.5W mb=4.4 EMSC SOUTH SHETLAND ISLANDS
P: 5APR2021 132834 61.0S 58.0W 3.0-5.6 ABAAA So. So. America
The M 4.8 in the Southeast Indian Ridge is the largest in that area within about 250 km since an M 5.1 on May 24, 2018 that followed an M 6.3 on March 24, 2018 and may be an aftershock of that event. Forecast 132825 had expected today's event was likely within about 100 km around April 5.
O: 5APR2021 20:24:11 45.1S 95.8E ML=4.8 EMSC SOUTHEAST INDIAN RIDGE
P: 5APR2021 132825 46.0S 96.0E 4.0-5.4 AAAAA So. Indian Ocean
The earthquake of M 5.2 in the area east of South Sandwich Islands the largest aftershock to date of the M 6.6 on April 3. Forecast 132831 had expected today's aftershock was likely around April 6.
O: 5APR2021 20:31:51 58.0S 8.2W mb=5.2 EMSC EAST OF SOUTH SANDWICH ISLANDS
P: 5APR2021 132831 56.0S 7.0W 4.0-5.6 ABAAA Atlantic-Indian Ridge
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 06APR2021 01:36:55 26.6N 88.6E mb=3.9 EMSC INDIA-BANGLADESH BORDER REGION
O: 5APR2021 15:19:59 27.2N 88.9E Mw=5.1 EMSC SIKKIM, INDIA
P: 8APR2021 132638 27.0N 88.0E 3.5-5.4 BAAAA Nepal
O: 5APR2021 11:33:28 39.5N 54.8E mb=4.7 EMSC TURKMENISTAN
P: 5APR2021 132718 40.0N 55.0E 4.0-5.5 AAAAA Kazakhstan
O: 5APR2021 13:43:05 54.8N 163.3E mb=4.8 EMSC OFF EAST COAST OF KAMCHATKA
P: 7APR2021 132756 56.0N 165.0E 4.0-5.6 ABAAA Komandorsky Isl
INDONESIA AND PHILIPPINES
O: 6APR2021 00:29:36 1.4S 137.2E ML=4.5 EMSC NEAR N COAST OF PAPUA, INDONES
P: 9APR2021 132599 1.0S 137.0E 4.0-5.4 BAAAA West Irian, PNG
O: 6APR2021 02:36:25 3.8N 95.9E ML=4.1 EMSC OFF W COAST OF NORTHERN SUMATR
P: 7APR2021 132576 4.0N 96.0E 4.0-5.8 AAAAA Nicobar Islands
O: 5APR2021 10:33:14 5.8S 129.9E ML=4.0 EMSC BANDA SEA
O: 6APR2021 05:27:47 7.7S 128.4E ML=4.5 EMSC KEPULAUAN BARAT DAYA, INDONESI
P: 5APR2021 132580 6.0S 128.0E 4.0-5.4 ABAAA Banda Sea
O: 6APR2021 00:29:36 1.4S 137.2E ML=4.5 EMSC NEAR N COAST OF PAPUA, INDONES
P: 9APR2021 132599 1.0S 137.0E 4.0-5.4 BAAAA West Irian, PNG
O: 5APR2021 22:09:01 15.1N 146.4E mb=4.6 EMSC SAIPAN REG., N. MARIANA ISLAND
P: 6APR2021 132624 14.0N 147.0E 4.0-5.4 ABAAA So. Marianas/Guam
NEIC reported this earthquake of M 4.6 in Saipan, Mariana Islands was felt with intensity II-III in the area(s) of Saipan, Mariana Islands at Tinian and Yigo, Guam.
CENTRAL AND SOUTH AMERICA
O: 5APR2021 16:41:58 3.6S 80.8W ML=4.3 EMSC PERU-ECUADOR BORDER REGION
P: 9APR2021 132583 4.0S 80.0W 4.0-5.5 BAAAA Ecuador
O: 6APR2021 00:15:28 8.2S 74.5W mb=4.4 EMSC CENTRAL PERU
P: 31MAR2021 132314 9.0S 75.0W 3.5-5.0 CAAAA Brazil
O: 5APR2021 17:57:32 16.2N 94.3W ML=4.1 EMSC OFFSHORE OAXACA, MEXICO
P: 8APR2021 132605 16.0N 93.0W 3.5-5.3 BAAAA Chiapas, Mexico
O: 6APR2021 05:22:05 18.4N 73.6W mb=4.6 EMSC HAITI REGION
P: 8APR2021 132623 19.0N 71.0W 3.4-5.2 AABAA Puerto Rico
NEIC reported this earthquake of M 4.6 in Haiti was felt with intensity II-III in the area(s) of Haiti in Baraderes amd Roche-a-Bateau.
O: 5APR2021 20:35:37 18.8N 67.5W Md=3.4 EMSC PUERTO RICO REGION
O: 5APR2021 09:24:54 19.1N 68.1W Md=3.5 EMSC DOMINICAN REPUBLIC REGION
P: 4APR2021 132623 19.0N 68.0W 3.4-5.3 AAAAA Puerto Rico
O: 6APR2021 02:26:56 24.2S 67.1W mb=4.6 EMSC SALTA, ARGENTINA
P: 5APR2021 132797 24.0S 68.0W 4.0-5.8 AAAAA Argentina
NEIC reported this earthquake of M 4.6 in San Juan, Argentina was felt with intensity II-III in the area(s) of San Juan, Argentina.
O: 6APR2021 05:47:16 31.4S 68.1W mb=4.6 EMSC SAN JUAN, ARGENTINA
P: 5APR2021 132812 31.0S 68.0W 4.0-5.7 AAAAA Central Chile
O: 5APR2021 11:51:21 36.1S 73.5W mb=4.5 EMSC OFFSHORE BIO-BIO, CHILE
P: 7APR2021 132814 36.0S 73.0W 4.0-6.0 AAAAA Central Chile
NEIC reported this earthquake of M 4.5 in Concepcion, BioBio, Chile was felt with intensity II-III in the area(s) of Concepcion, BioBio, Chile.
O: 5APR2021 08:22:45 28.0N 112.2W ML=3.6 EMSC GULF OF CALIFORNIA
P: 9APR2021 132632 28.0N 112.0W 3.5-5.3 BAAAA Gulf of California
O: 5APR2021 21:27:43 38.9S 72.1W mb=4.1 EMSC ARAUCANIA, CHILE
P: 6APR2021 132815 39.0S 73.0W 4.0-5.4 AAAAA Central Chile
AFRICA AND EUROPE
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 5APR2021 08:11:37 17.6S 179.2E mb=4.7 EMSC FIJI
P: 4APR2021 132786 17.0S 178.0E 4.0-5.4 AAAAA Fiji Islands
OCEAN RIDGES
O: 6APR2021 01:59 62.4S 58.4W mb=4.2 GUC Antartida at Antartida, Base F
O: 6APR2021 01:59:55 62.2S 58.5W mb=4.4 EMSC SOUTH SHETLAND ISLANDS
P: 5APR2021 132834 61.0S 58.0W 3.0-5.6 ABAAA So. So. America
P: 5APR2021 132834 61.0S 58.0W 3.0-5.6 ABAAA So. So. America
GUC reported this earthquake was felt with intensity III in Antartida at Antartida, Base Frei and in Base Fildes, Chile.
O: 5APR2021 20:24:11 45.1S 95.8E ML=4.8 EMSC SOUTHEAST INDIAN RIDGE
P: 5APR2021 132825 46.0S 96.0E 4.0-5.4 AAAAA So. Indian Ocean
O: 5APR2021 20:31:51 58.0S 8.2W mb=5.2 EMSC EAST OF SOUTH SANDWICH ISLANDS
P: 5APR2021 132831 56.0S 7.0W 4.0-5.6 ABAAA Atlantic-Indian Ridge
ZEALANDIA AND AUSTRALIA REGION
O: 05APR2021 07:07:43 37.4S 179.9E ML=3.8 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 05APR2021 07:37:53 37.6S 179.5E Mw=6.0 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 05APR2021 07:37:52 37.6S 179.7E ML=6.5 GEONET Felt with moderate intensity
O: 05APR2021 15:20:25 37.7S 179.6E ML=4.1 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 5APR2021 14:00:17 37.4S 179.9E ML=3.6 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 5APR2021 132819 38.0S 177.0E 3.0-4.6 AABAA North Island, N.Z.
O: 5APR2021 19:35:23 29.5S 177.1W mb=5.0 EMSC KERMADEC ISLANDS, NEW ZEALAND
P: 5APR2021 132802 29.0S 176.0W 4.0-5.4 AAAAA No. Kermadec Islands
O: 5APR2021 23:58:09 31.3S 179.2E mb=4.4 EMSC KERMADEC ISLANDS REGION
P: 5APR2021 132821 31.0S 178.0E 4.0-5.6 AAAAA So. Kermadec Islands
O: 5APR2021 14:00:17 37.4S 179.9E ML=3.6 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 5APR2021 132819 38.0S 177.0E 3.0-4.6 AABAA North Island, N.Z.
O: 5APR2021 10:54:02 37.5S 179.8W ML=3.5 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 5APR2021 132818 37.0S 179.0W 3.5-5.0 AAAAA E. of North Islands N.Z.
O: 6APR2021 00:36:29 38.0S 176.5E ML=3.9 EMSC NORTH ISLAND OF NEW ZEALAND
P: 5APR2021 132819 38.0S 177.0E 3.0-4.6 AAAAA North Island, N.Z.
O: 5APR2021 23:42:48 39.0S 175.0E ML=3.9 EMSC NORTH ISLAND OF NEW ZEALAND
P: 7APR2021 132824 40.0S 175.0E 3.0-4.6 AAAAA North Island, N.Z.
O: 5APR2021 17:31:16 47.5S 166.3E ML=3.9 EMSC OFF W. COAST OF S. ISLAND, N.Z
P: 4APR2021 132827 45.0S 167.0E 3.0-5.1 ABAAA So. Island, N.Z.
JAPAN AND KURIL ISLANDS
No earthquakes of M>=4 were located in Japan or the Kuril Islands today.
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 05APR2021 20:27:22 40.3N 124.6W Ml=2.8 EMSC OFFSHORE NORTHERN CALIFORNIA
O: 5APR2021 11:42:38 40.3N 124.6W Md=2.4 EMSC OFFSHORE NORTHERN CALIFORNIA
P: 3APR2021 132732 40.3N 124.7W 2.5-4.4 AAAAA Off Coast of No. Calif
NEIC reported this earthquake of M 2.8 offshore Northern California was felt with intensity II-III in the area(s) of Northern California at Ukiah.
O: 05APR2021 11:44:00 33.9N 118.3W ML=4.1 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 12:27:47 33.9N 118.3W Ml=2.3 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 12:53:07 33.9N 118.3W Ml=2.3 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 13:19:22 33.9N 118.3W Ml=2.0 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 14:57:54 33.9N 118.3W Ml=2.0 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 21:37:45 33.9N 118.4W Ml=2.2 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 11:47:04 34.0N 118.4W Ml=2.0 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 11:48:40 34.0N 118.3W Ml=2.4 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 05APR2021 12:29:48 34.0N 118.3W Ml=2.4 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 06APR2021 01:10:17 34.0N 118.4W Ml=2.2 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 06APR2021 01:12:21 34.0N 118.3W Ml=2.1 EMSC GREATER LOS ANGELES AREA, CALIF.
O: 5APR2021 11:15:37 33.9N 118.3W ML=3.0 EMSC GREATER LOS ANGELES AREA, CALI
P: 3APR2021 132691 34.2N 117.8W 2.5-4.6 AAAAA So. California
P: 4APR2021 132693 34.0N 118.7W 2.5-4.8 AAAAA So. California
O: 05APR2021 16:08:48 33.5N 116.6W Ml=2.0 EMSC SOUTHERN CALIFORNIA
O: 5APR2021 21:20:44 32.3N 115.3W Ml=3.0 EMSC BAJA CALIFORNIA, MEXICO
P: 4APR2021 132689 32.9N 115.6W 2.5-4.4 AAAAA So. California
O: 6APR2021 03:04:24 33.0N 116.4W Ml=2.3 EMSC SOUTHERN CALIFORNIA
P: 6APR2021 132690 33.4N 116.7W 2.5-4.5 AAAAA So. California
O: 05APR2021 20:34:08 36.6N 121.1W Md=2.1 EMSC CENTRAL CALIFORNIA
O: 05APR2021 22:30:47 36.6N 121.2W Md=2.1 EMSC CENTRAL CALIFORNIA
O: 5APR2021 18:14:44 36.6N 121.2W Md=2.2 EMSC CENTRAL CALIFORNIA
P: 6APR2021 132658 36.2N 120.8W 2.5-4.9 AAAAA Central California
O: 6APR2021 01:44:52 37.6N 121.6W Md=2.4 EMSC NORTHERN CALIFORNIA
P: 5APR2021 132661 37.7N 121.9W 2.5-4.7 AAAAA Central California
O: 5APR2021 13:33:33 38.2N 118.1W ml=2.1 EMSC NEVADA
P: 4APR2021 132655 38.6N 118.6W 2.5-4.7 AAAAA California/Nevada area
O: 5APR2021 16:42:01 38.8N 122.7W Md=2.7 EMSC NORTHERN CALIFORNIA
P: 4APR2021 132662 38.9N 122.8W 2.5-4.4 AAAAA Central California
NEIC reported this earthquake of M 2.7 in the Geysers, California was felt with intensity II-III in the area(s) of Kelseyville, California.
ALASKA
O: 05APR2021 16:43:30 58.5N 137.2W ml=3.0 EMSC SOUTHEASTERN ALASKA
O: 05APR2021 16:44:30 58.5N 137.1W ml=3.1 EMSC SOUTHEASTERN ALASKA
O: 05APR2021 17:42:48 58.5N 137.1W ml=3.0 EMSC SOUTHEASTERN ALASKA
O: 05APR2021 23:56:36 58.5N 137.1W ML=3.1 EMSC SOUTHEASTERN ALASKA
O: 5APR2021 13:47:30 58.5N 137.1W ML=3.0 EMSC SOUTHEASTERN ALASKA
P: 3APR2021 132764 59.0N 139.0W 3.0-4.8 AAAAA Southeast Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 5APR2021 08:01:31 42.1N 124.3W Ml=2.3 EMSC OREGON
P: 3APR2021 132732 40.3N 124.7W 2.5-4.4 ABAAA Off Coast of No. Calif
O: 5APR2021 18:43:22 47.0N 122.2W Md=2.0 EMSC PUGET SOUND REGION, WASHINGTON
P: 3APR2021 132743 48.4N 123.2W 2.0-4.1 ABAAA Washington state, U.S.
ROCKY MOUNTAINS REGION
O: 5APR2021 20:56:42 38.7N 112.1W ML=3.2 EMSC UTAH
P: 9APR2021 132706 38.6N 112.7W 2.0-3.9 BAAAA Utah area
NEIC reported this earthquake of M 3.0 in Central Utah was felt with intensity II-III in the area(s) of Central Utah at Monroe, Richfield and Salina.
O: 05APR2021 10:05:38 44.5N 115.2W Ml=3.0 EMSC SOUTHERN IDAHO
O: 5APR2021 10:24:37 44.4N 115.2W Ml=2.1 EMSC SOUTHERN IDAHO
P: 6APR2021 132723 44.4N 115.1W 2.0-4.2 AAAAA Montana/Idaho
EASTERN U.S./CANADA
NEIC reported an earthquake of M 3.1 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma in Mustang, El Reno.
HAWAII
No earthquakes of M>=3 were located in Hawaii.
MODERATE QUAKE SHAKES GULF OF CALIFORNIA
EARTHQUAKE SUMMARY FOR APRIL 4, 2021
The strongest earthquake in the world today was an M 5.4 in the Gulf of California. NEIC reported it was felt with intensity II-III in Baja California at Los Cabos and Cabo San Lucas. This earthquake occurred near local solar noon and was probably promoted by high tidal stresses which maximize near this hour. The last earthquake with M>=5.4 within about 150 km of this epicenter was an M 5.5 on October 8, 2018 and prior to that an M 5.5 on September 22, 2017. The last of significantly larger magnitude was an M 6.6 on September 13, 2015. This earthquake may have been promoted by antipodal effects from a tropical cyclone south of Java at the end of March. This summary had suggested that this could help promote seismicity in the Gulf of California at this time as:
"A tropical cyclone may be forming in the south Indian Ocean. This system is currently located at 11S 68E with winds up to 33 kts and moving to the ESE. Some regional mid-ocean ridge activity is may be enhanced with this storm. The antipode is in the Gulf of California at 11N 112W. Activity in this area may also see enhanced seismicity with this storm." (March 28-30, 2021)
Forecast 132359 had expected today's activity within about 25 km of this epicenter was likely around March 31.
O: 04APR2021 18:43:26 24.0N 108.7W Mw=5.4 EMSC GULF OF CALIFORNIA
O: 4APR2021 13:56:29 23.9N 108.9W ML=4.2 EMSC GULF OF CALIFORNIA
P: 31MAR2021 132359 24.0N 109.0W 3.5-5.0 BAAAA Gulf of California
O: 4APR2021 19:02:57 27.7N 111.7W ML=3.4 EMSC GULF OF CALIFORNIA
P: 31MAR2021 132359 28.0N 112.0W 3.5-5.1 BAAAA Gulf of California
The strongest earthquake in the U.S. or Canada today was an M 3.8 in Central Alaska. NEIC reported this earthquake of M 3.7-3.8 in Central Alaska was felt with intensity II-III in the area(s) of Central Alaska at Tok and North Pole. Two earthquakes of equal or larger magnitude have occurred within about 150 km of this epicenter in the past four years - an M 4.1 on October 26, 2020, possibly triggered by the M 7.6 in the Alaska Peninsula of October 19, 2020 and an M 4.0 on October 10, 2019. Forecast 132771 had expected today's event in this region was likely around April 8.
O: 4APR2021 17:09:21 63.3N 143.4W ML=3.8 EMSC CENTRAL ALASKA
P: 8APR2021 132771 63.1N 144.7W 3.2-5.1 BAAAA Central Alaska
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 4APR2021 20:09:53 36.9N 75.8E mb=4.2 EMSC KASHMIR-XINJIANG BORDER REGION
P: 5APR2021 132668 36.0N 72.0E 3.8-5.2 AACAA Hindu Kush/Pakistan
O: 5APR2021 01:28:40 42.0N 81.1E mb=4.8 EMSC NORTHERN XINJIANG, CHINA
P: 5APR2021 132719 42.0N 82.0E 4.0-5.4 AAAAA Kirgizstan/Xinjiang
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 5APR2021 05:40:35 3.7N 126.9E mb=4.6 EMSC KEPULAUAN TALAUD, INDONESIA
P: 8APR2021 132572 4.0N 128.0E 4.0-5.6 BAAAA Halmahera
O: 5APR2021 02:32:46 7.3S 129.2E mb=4.4 EMSC KEPULAUAN BABAR, INDONESIA
P: 30MAR2021 132313 7.0S 129.0E 4.0-5.4 CAAAA Banda Sea
O: 4APR2021 13:39:50 9.2S 110.1E ML=4.3 EMSC SOUTH OF JAVA, INDONESIA
P: 7APR2021 132592 9.0S 110.0E 4.0-5.4 BAAAA So. of Java
No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.
CENTRAL AND SOUTH AMERICA
O: 4APR2021 04:17 29.0S 71.9W mb=4.6 GUC Coquimbo at La Higuera;III in
P: 4APR2021 132817 30.0S 71.0W 4.0-5.5 AAAAA Coast Central Chile
GUC reported this earthquake was felt with intensity IV in Coquimbo at La Higuera;III in La Serena, Monte Patria and Vicuna and with III in Atacma at Alto del Carmen, Freirina, Huasco, Vallenar, Chile.
O: 5APR2021 03:41:30 10.6N 83.1W ML=4.0 EMSC COSTA RICA
P: 5APR2021 132603 10.0N 84.0W 3.5-5.5 AAAAA Caribbean Sea
O: 4APR2021 10:17:54 9.0S 75.2W ML=4.0 EMSC CENTRAL PERU
P: 31MAR2021 132314 9.0S 75.0W 3.5-5.0 BAAAA Brazil
O: 5APR2021 04:31:39 12.7N 88.5W ML=4.0 EMSC OFFSHORE EL SALVADOR
P: 7APR2021 132617 13.0N 87.0W 3.5-5.8 AABAA Nicaragua
O: 5APR2021 06:48:33 15.2S 71.7W ML=4.0 EMSC SOUTHERN PERU
P: 3APR2021 132792 16.0S 71.0W 4.0-5.7 AAAAA So. Peru/Bolivia
O: 4APR2021 11:46:33 16.0N 95.8W ML=4.0 EMSC OAXACA, MEXICO
P: 6APR2021 132620 15.0N 96.0W 3.5-5.2 AAAAA Oaxaca, Mexico
O: 4APR2021 19:29:19 17.3N 91.7W ML=4.0 EMSC CHIAPAS, MEXICO
P: 8APR2021 132605 16.0N 93.0W 3.5-5.3 BBAAA Chiapas, Mexico
O: 5APR2021 04:26:53 17.7N 101.5W ML=4.3 EMSC GUERRERO, MEXICO
P: 5APR2021 132615 19.0N 102.0W 3.5-5.5 ABAAA Michoacan, Mexico
O: 4APR2021 11:19:56 18.1N 103.3W ML=4.3 EMSC OFFSHORE MICHOACAN, MEXICO
P: 9APR2021 132615 18.0N 103.0W 3.5-5.4 BAAAA Michoacan, Mexico
O: 5APR2021 06:58:49 18.3N 67.6W Md=3.2 EMSC MONA PASSAGE, PUERTO RICO
P: 4APR2021 132623 19.0N 68.0W 3.4-5.3 AAAAA Puerto Rico
O: 4APR2021 16:13:42 18.3N 71.3W ML=3.0 EMSC DOMINICAN REPUBLIC
O: 04APR2021 07:17:02 19.1N 71.2W ML=3.0 EMSC DOMINICAN REPUBLIC
P: 4APR2021 132628 20.0N 71.0W 3.0-4.6 ABAAA Bahamas/No. Caribbean
O: 4APR2021 07:39:29 19.2N 69.9W ML=3.0 EMSC DOMINICAN REPUBLIC
P: 5APR2021 132628 20.0N 69.0W 3.0-4.7 AAAAA Bahamas/No. Caribbean
O: 04APR2021 18:43:26 24.0N 108.7W Mw=5.4 EMSC GULF OF CALIFORNIA
O: 4APR2021 13:56:29 23.9N 108.9W ML=4.2 EMSC GULF OF CALIFORNIA
P: 31MAR2021 132359 24.0N 109.0W 3.5-5.0 BAAAA Gulf of California
O: 4APR2021 19:02:57 27.7N 111.7W ML=3.4 EMSC GULF OF CALIFORNIA
P: 31MAR2021 132359 28.0N 112.0W 3.5-5.1 BAAAA Gulf of California
AFRICA AND EUROPE
O: 5APR2021 05:02:33 40.2N 19.9E mb=4.3 EMSC ALBANIA
P: 3APR2021 132677 39.0N 20.0E 3.0-4.7 ABAAA No. Greece
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 5APR2021 01:42:47 21.8S 170.8E Mw=5.3 EMSC SOUTHEAST OF LOYALTY ISLANDS
P: 3APR2021 132800 22.0S 172.0E 4.0-5.4 AAAAA Loyalty Islands
O: 4APR2021 14:46:07 25.7S 179.6E mb=4.5 EMSC SOUTH OF FIJI ISLANDS
P: 9APR2021 132811 23.0S 179.0E 4.0-5.4 BCAAA Tonga/Fiji
OCEAN RIDGES
O: 4APR2021 11:02:26 0.7N 25.4W mb=5.0 EMSC CENTRAL MID-ATLANTIC RIDGE
P: 10APR2021 132566 1.0N 26.0W 4.0-6.1 CAAAA Central Mid-Atlantic Ridg
O: 4APR2021 16:35:36 40.9S 16.8W mb=4.8 EMSC SOUTHERN MID-ATLANTIC RIDGE
P: 10APR2021 132828 44.0S 16.0W 4.0-5.7 CCAAA So. Mid-Atlantic Ridge
ZEALANDIA AND AUSTRALIA REGION
O: 4APR2021 17:25:45 30.5S 177.3W mb=4.9 EMSC KERMADEC ISLANDS, NEW ZEALAND
P: 4APR2021 132818 30.0S 177.0W 4.0-5.5 AAAAA No. Kermadec Islands
O: 4APR2021 18:58:05 41.1S 175.8E ML=3.9 EMSC NORTH ISLAND OF NEW ZEALAND
P: 4APR2021 132826 41.0S 175.0E 3.0-5.3 AAAAA So. Island, N.Z.
O: 4APR2021 07:20:28 42.5S 173.1E ML=3.6 EMSC SOUTH ISLAND OF NEW ZEALAND
P: 26MAR2021 132556 42.0S 172.0E 3.0-4.9 CAAAA So. Island, N.Z.
O: 5APR2021 01:23:02 44.1S 168.8E ML=4.4 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 05APR2021 01:23:03 44.1S 168.8E MS=4.6 GEONET Felt with light intensity
P: 4APR2021 132827 45.0S 167.0E 3.0-5.1 AABAA So. Island, N.Z.
GEONET reported this earthquake was felt with light intensity in the area southwest of Haast, South Island. 47 reports of felt intensity came from the area east and north of the epicenter. More than 47 people reported feeling this earthquake with 40 reporting weak shaking and 7 light intensity.
JAPAN AND KURIL ISLANDS
O: 5APR2021 00:31:47 33.4N 140.6E mb=4.6 EMSC IZU ISLANDS, JAPAN REGION
P: 3APR2021 132683 33.0N 142.0E 4.0-5.6 AAAAA Off East Coast Honshu
O: 4APR2021 21:21:57 34.6N 137.5E mb=4.6 EMSC NEAR S. COAST OF HONSHU, JAPAN
P: 3APR2021 132664 34.0N 135.0E 3.5-4.9 AABAA Central/So. Honshu Japan
NEIC reported this earthquake of M 4.6 south of Honshu, Japan was felt with intensity II-III in the area(s) of Honshu, Japan at Nagakute.
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 4APR2021 21:14:43 34.0N 117.0W ML=3.1 EMSC SOUTHERN CALIFORNIA
O: 4APR2021 21:14:43 34.0N 117.0W ML=3.4 ANSS SOUTHERN CALIFORNIA
P: 3APR2021 132691 34.2N 117.8W 2.5-4.6 AAAAA So. California
NEIC reported this earthquake of M 3.4 in Southern California was felt with intensity II-III in the area(s) of Southern Californian Calimesa (IV), Beaumont, Yucaipa, Banning, Moreno Valley, Redlands, Forest Falls, Mentone, Nuevo and San Jacinto.
O: 4APR2021 07:18:21 31.5N 115.5W ML=3.2 EMSC BAJA CALIFORNIA, MEXICO
P: 3APR2021 132686 30.2N 114.1W 2.0-4.2 ABBAA SW U.S.A
O: 4APR2021 17:58:55 35.8N 121.3W Md=2.3 EMSC CENTRAL CALIFORNIA
P: 3APR2021 132684 35.7N 121.2W 2.5-4.6 AAAAA Off So. California
O: 4APR2021 22:41:41 36.1N 120.2W Md=2.2 EMSC CENTRAL CALIFORNIA
P: 9APR2021 132658 36.1N 120.1W 2.5-4.9 BAAAA Central California
O: 5APR2021 02:10:01 40.0N 122.7W Md=2.2 EMSC NORTHERN CALIFORNIA
P: 4APR2021 132731 40.6N 122.4W 2.5-4.6 AAAAA Northern California
O: 4APR2021 21:11:52 40.4N 127.5W ML=2.8 EMSC OFF COAST OF NORTHERN CALIFORN
P: 8APR2021 132732 42.5N 126.8W 3.0-4.6 BBAAA Off Coast of Oregon
P: 26MAR2021 132461 40.3N 127.2W 2.5-4.6 CAAAA Off Coast of No. Calif
O: 4APR2021 16:38:40 40.5N 121.5W Md=2.2 EMSC LASSEN PEAK AREA, CALIFORNIA
P: 6APR2021 132731 40.7N 121.3W 2.5-4.5 AAAAA Northern California
ALASKA
O: 5APR2021 00:14:36 56.2N 150.0W ML=3.2 EMSC GULF OF ALASKA
P: 7APR2021 132773 55.0N 148.0W 3.0-5.0 ABBAA Northern Alaska
O: 5APR2021 03:48:08 61.7N 151.4W ML=3.2 EMSC SOUTHERN ALASKA
P: 6APR2021 132770 61.3N 150.9W 3.2-5.0 AAAAA Central Alaska
O: 4APR2021 17:09:21 63.3N 143.4W ML=3.8 EMSC CENTRAL ALASKA
P: 8APR2021 132771 63.1N 144.7W 3.2-5.1 BAAAA Central Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
No events of M>=2 were located in the northwestern U.S. or western Canada today.
ROCKY MOUNTAINS REGION
O: 04APR2021 19:03:54 44.3N 115.2W ML=2.6 EMSC SOUTHERN IDAHO
O: 4APR2021 07:52:30 44.5N 115.2W Ml=3.0 EMSC SOUTHERN IDAHO
P: 6APR2021 132723 44.4N 115.1W 2.0-4.2 AAAAA Montana/Idaho
NEIC reported this earthquake of M 3.0 in Southern Idaho was felt with intensity II-III in the area(s) of Southern Idaho at McCall.
O: 4APR2021 10:53:05 46.7N 113.3W Ml=2.0 EMSC WESTERN MONTANA
P: 7APR2021 132724 45.7N 112.1W 2.0-4.3 BAAAA Montana/Idaho
EASTERN U.S./CANADA
O: 4APR2021 10:07:18 37.1N 88.8W Md=2.0 EMSC WESTERN KENTUCKY
P: 8APR2021 132675 38.0N 90.0W 2.0-4.2 BAAAA New Madrid area
HAWAII
No earthquakes of M>=3 were located in Hawaii.
M 5.4 SHAKES NORTHERN NAMIBIA, SOUTHERN AFRICA
EARTHQUAKE SUMMARY FOR APRIL 3, 2021
An unusual earthquake of M 5.4 hit the region of northern Namibia today. NEIC reported it was felt with maximum intensity VI in Namibia in Okahandja, IV in Khorixas and Outjo; III in Swakopmuna and I in Otjiwarongo. This is the largest earthquake in northern Namibia within about 500 km of this epicenter in at least the past 30 years. The largest earthquakes in Northern Namibia previously were an M 5.0 in southern Namibia on December, 1992 and an M 5.0-5.1 north of Namibia on June 5, 1989. An M 4.6 hit within about 25 km of today's event on November 21, 2019. Today's event may have been promoted by the M 6.6 in the South Atlantic Ocean which occurred on April 2, the largest in
that area in at least 30 years as noted in the previous issue of this summary:
"The largest earthquake in the world today was an M 6.6 in the South Atlantic east of the South Sandwich Islands. This is the strongest quake within about 500 km of this epicenter since an M 6.6 on May 23, 1995, the only such event in at least the past 30 years." (April 2-3, 2021)
This event joins a series of unusual earthquakes in West Africa which included a series in March 6-9, 2021 which included a similar M 5.4 in Gabon.
Today's epicenter in Namibia is at the third node (120 degrees) from the M 7.3 off North Island, New Zealand of March 4 and may have been promoted extensive energy from that source.
O: 4APR2021 01:41:02 19.9S 14.6E Mw=5.4 EMSC NAMIBIA
An aftershock in the South Atlantic also occurred today with M 5.1.
Forecast 132831 had expected today's activity was likely in this region of the South Sandwich Islands around April 5 within about 200 km of today's epicenter.
The strongest earthquake in the world today was an M 6.0 in the Banda Sea. It may have been felt in northwestern Australia near Darwin and in Ambon, Indonesia. This quake occurred while a tropical cyclone was forming near the epicenter. This summary noted the cyclone as:
"A tropical cyclone may be forming south of the Banda Sea. This system is currently located at 10S 124E with winds up to 30 kts and moving to the northeast. Activity in the Banda Sea area is likely to be enhanced while this system is in the area." (April 3-4, 2021)
This is the strongest earthquake in the Banda Sea within about 200 km of this epicenter since an M 6.8 on May 6, 2020 and an M 7.3 on June 24, 2019.
Forecast 132580 had expected today's event within about 100 km was likely around
April 5. This epicenter is at 107 degrees from the M 6.6 in the South Atlantic of April 2 and may have been promoted by energy from that source. Other activity around 103 degrees from the South Atlantic M 6.6 occurred today in Fiji, Oaxaca, Mexico, northern and central Europe, Greece, Sumatra with moderate magnitudes.
O: 3APR2021 18:42:02 5.1S 128.1E Mw=6.0 EMSC BANDA SEA
P: 5APR2021 132580 6.0S 128.0E 4.0-5.4 AAAAA Banda Sea
The strongest earthquakes in the U.S. or Canada today occurred in Hawaii with M 4.3 and 3.9-4.0. NEIC reported these were felt in Hawaii with intensity IV in Pahala and II-III in Hawaii National Park, Maalehu, Captain Cook, Volcano, Holualoa, Hilo, Kealakehua, Mountain View and Paauilo. The M 4.3 is the strongest earthquake in Hawaii Island area since an M 4.4 on December 21, 2020 and December 14, 2020. The last event in the area of significantly larger magnitude was an M 4.7 on July 27, 2020. Forecast 132610 had expected today's activity was likely within about 50 km around April 4. Some of the strongest activity in Hawaii historically has occurred in late March and early April as in 1868 and 2000.
O: 03APR2021 21:01:55 19.3N 155.5W ML=4.0 EMSC ISLAND OF HAWAII, HAWAII
O: 03APR2021 21:15:22 19.3N 155.5W ML=4.3 EMSC ISLAND OF HAWAII, HAWAII
O: 3APR2021 10:54:30 19.2N 155.5W ML=3.0 EMSC ISLAND OF HAWAII, HAWAII
P: 4APR2021 132610 18.8N 155.2W 3.0-4.7 AAAAA Hawaii
A series of earthquakes of M 4.0, 4.0 and 3.7 occurred today in the Gulf of
California. These began near local solar noon near a longitude expected to see enhanced seismicity with this full moon and may have been promoted by high tidal stresses which dominate at this hour. Forecast 132632 had expected this activity was likely in the Gulf of California in early April.
O: 03APR2021 22:28:23 26.6N 110.7W ML=4.0 EMSC GULF OF CALIFORNIA
O: 03APR2021 20:11:23 26.7N 110.6W ML=3.7 EMSC GULF OF CALIFORNIA
O: 3APR2021 20:14:58 26.6N 110.7W ML=4.0 EMSC GULF OF CALIFORNIA
P: 9APR2021 132632 28.0N 112.0W 3.5-5.3 CBBAA Gulf of California
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 4APR2021 06:16:28 36.1N 69.8E mb=4.4 EMSC HINDU KUSH REGION, AFGHANISTAN
P: 5APR2021 132668 36.0N 72.0E 3.8-5.2 AABAA Hindu Kush/Pakistan
O: 4APR2021 04:55:34 38.0N 72.6E mb=4.3 EMSC TAJIKISTAN
P: 6APR2021 132668 38.0N 73.0E 3.8-5.7 AAAAA Hindu Kush/Pakistan
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 4APR2021 00:35:47 2.3N 97.8E ML=4.3 EMSC NORTHERN SUMATRA, INDONESIA
P: 7APR2021 132576 4.0N 96.0E 4.0-5.8 BBBAA Nicobar Islands
O: 3APR2021 18:42:02 5.1S 128.1E Mw=6.0 EMSC BANDA SEA
P: 5APR2021 132580 6.0S 128.0E 4.0-5.4 AAAAA Banda Sea
O: 3APR2021 11:56:50 8.9S 122.4E ML=4.1 EMSC FLORES REGION, INDONESIA
P: 6APR2021 132584 8.0S 124.0E 4.0-5.6 BABAA Flores Island area
O: 4APR2021 06:02:52 9.0S 111.3E ML=4.0 EMSC SOUTH OF JAVA, INDONESIA
P: 7APR2021 132592 9.0S 110.0E 4.0-5.4 BAAAA So. of Java
CENTRAL AND SOUTH AMERICA
O: 03APR2021 22:28:23 26.6N 110.7W ML=4.0 EMSC GULF OF CALIFORNIA
O: 03APR2021 20:11:23 26.7N 110.6W ML=3.7 EMSC GULF OF CALIFORNIA
O: 3APR2021 20:14:58 26.6N 110.7W ML=4.0 EMSC GULF OF CALIFORNIA
P: 9APR2021 132632 28.0N 112.0W 3.5-5.3 CBBAA Gulf of California
O: 3APR2021 19:26:30 9.5N 84.7W ML=4.5 EMSC COSTA RICA
P: 5APR2021 132570 9.0N 86.0W 3.5-5.1 AAAAA Costa Rica
O: 3APR2021 08:23:41 15.4N 94.7W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO
P: 5APR2021 132605 17.0N 95.0W 3.5-5.3 ABAAA Chiapas, Mexico
O: 3APR2021 09:52:07 15.9N 98.8W ML=4.1 EMSC OFFSHORE GUERRERO, MEXICO
P: 6APR2021 132621 17.0N 98.0W 3.5-5.2 BBAAA Oaxaca, Mexico
O: 3APR2021 17:59:08 16.0N 96.2W mb=4.5 EMSC OAXACA, MEXICO
P: 5APR2021 132605 17.0N 95.0W 3.5-5.3 AAAAA Chiapas, Mexico
O: 3APR2021 15:12:43 16.8N 99.9W ML=4.0 EMSC OFFSHORE GUERRERO, MEXICO
P: 7APR2021 132620 16.0N 100.0W 3.5-5.1 BAAAA Oaxaca, Mexico
O: 3APR2021 15:53:24 19.0N 69.4W ML=3.1 EMSC DOMINICAN REPUBLIC
P: 2APR2021 132623 18.0N 69.0W 3.4-5.2 AAAAA Puerto Rico
O: 3APR2021 07:44:39 19.1N 67.2W Md=3.2 EMSC PUERTO RICO REGION
P: 4APR2021 132623 19.0N 68.0W 3.4-5.3 AAAAA Puerto Rico
O: 4APR2021 04:17:22 29.0S 72.0W ML=4.6 EMSC OFFSHORE ATACAMA, CHILE
P: 4APR2021 132817 30.0S 71.0W 4.0-5.5 AAAAA Coast Central Chile
NEIC reported this earthquake of M 4.4 in Atacama, Chile was felt with intensity II-III in the area(s) of Atacama, Chile at La Serena, Coquimbo (V) and Villa del Mar, Valparaiso.
O: 3APR2021 21:31:09 32.1S 70.0W mb=4.4 EMSC SAN JUAN, ARGENTINA
P: 5APR2021 132813 32.0S 71.0W 4.0-5.9 AAAAA Central Chile
AFRICA AND EUROPE
O: 4APR2021 01:41:02 19.9S 14.6E Mw=5.4 EMSC NAMIBIA
O: 3APR2021 20:05:56 39.7N 22.2E mb=4.4 EMSC GREECE
P: 5APR2021 132677 38.0N 22.0E 3.0-4.6 ABAAA No. Greece
P: 31MAR2021 132466 40.0N 23.0E 3.0-5.1 BAAAA Romania/NW Turkey
NEIC reported this earthquake of M 4.4 in Greece was felt with intensity II-III in the area(s) of Greece at Larisa.
O: 3APR2021 09:32:21 42.3N 1.6E ML=3.8 EMSC PYRENEES
O: 3APR2021 15:08:09 43.1N 3.2E ML=3.8 EMSC NEAR SOUTH COAST OF FRANCE
P: 28MAR2021 132443 43.0N 1.0E 3.0-5.0 BABAA France
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 3APR2021 15:34:22 17.7S 178.5W mb=4.4 EMSC FIJI REGION
P: 5APR2021 132795 17.0S 179.0W 4.0-5.6 AAAAA Tonga Islands
No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.
OCEAN RIDGES
O: 3APR2021 16:43:42 3.3S 12.1W mb=5.0 EMSC NORTH OF ASCENSION ISLAND
P: 3APR2021 132590 5.0S 12.0W 4.0-5.6 ABAAA No. of Ascension Isl
O: 3APR2021 20:26:01 8.7S 67.6E mb=5.0 EMSC MID-INDIAN RIDGE
O: 4APR2021 01:20:04 42.7S 82.1W mb=4.7 EMSC WEST CHILE RISE
P: 10APR2021 132823 43.0S 83.0W 4.0-5.5 CAAAA Chile Rise
O: 3APR2021 11:11:29 57.9S 7.6W mb=5.0 EMSC EAST OF SOUTH SANDWICH ISLANDS
P: 5APR2021 132831 56.0S 7.0W 4.0-5.6 ABAAA Atlantic-Indian Ridge
ZEALANDIA AND AUSTRALIA REGION
O: 3APR2021 13:56:09 30.0S 177.1W mb=4.6 EMSC KERMADEC ISLANDS, NEW ZEALAND
P: 4APR2021 132818 30.0S 177.0W 4.0-5.5 AAAAA No. Kermadec Islands
O: 3APR2021 13:03:30 34.4S 179.7E ML=3.8 EMSC SOUTH OF KERMADEC ISLANDS
P: 25MAR2021 132547 35.0S 179.0E 3.0-4.5 CAAAA North Island, N.Z.
O: 4APR2021 03:46:57 37.7S 179.7E ML=3.6 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 5APR2021 132819 38.0S 177.0E 3.0-4.6 AABAA North Island, N.Z.
JAPAN AND KURIL ISLANDS
O: 3APR2021 15:28:10 22.5N 142.0E mb=4.5 EMSC VOLCANO ISLANDS, JAPAN REGION
P: 7APR2021 132646 23.0N 143.0E 4.0-5.4 BAAAA Volcano Islands
O: 3APR2021 12:58:26 38.9N 142.1E mb=4.6 EMSC NEAR EAST COAST OF HONSHU, JAP
P: 29MAR2021 132405 39.0N 141.0E 4.0-5.4 BAAAA Off East Coast Honshu
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 3APR2021 22:20:03 35.0N 116.9W Ml=2.1 EMSC SOUTHERN CALIFORNIA
P: 26MAR2021 132421 35.5N 116.4W 2.5-4.5 CAAAA So. California
O: 3APR2021 13:17:16 36.2N 118.1W Ml=2.0 EMSC CENTRAL CALIFORNIA
P: 4APR2021 132650 36.2N 117.9W 2.5-4.8 AAAAA California/Nevada area
O: 3APR2021 07:17:26 36.8N 121.5W Md=2.7 EMSC CENTRAL CALIFORNIA
O: 03APR2021 23:12:06 36.8N 121.5W Md=2.3 EMSC CENTRAL CALIFORNIA
P: 3APR2021 132660 36.9N 121.7W 2.5-4.6 AAAAA Central California
NEIC reported this earthquake of M 2.7 in Central California was felt with intensity II-III in the area(s) of Central California at San Juan Bautista, Salinas, Castroville, Gilroy, Hollister and Marina.
O: 4APR2021 02:55:47 38.2N 117.8W ml=2.0 EMSC NEVADA
P: 3APR2021 132654 37.8N 118.2W 2.5-4.8 AAAAA California/Nevada area
ALASKA
O: 3APR2021 20:47:02 59.1N 152.3W ML=3.4 EMSC SOUTHERN ALASKA
P: 5APR2021 132770 60.3N 153.0W 3.2-5.0 ABAAA Central Alaska
O: 3APR2021 09:27:02 63.6N 150.8W ML=3.0 EMSC CENTRAL ALASKA
P: 4APR2021 132771 63.0N 148.6W 3.2-5.0 AAAAA Central Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
No events of M>=2 were located in the northwestern U.S. or western Canada today.
ROCKY MOUNTAINS REGION
O: 3APR2021 18:14:53 31.6N 104.5W ML=3.0 EMSC WESTERN TEXAS
P: 3APR2021 132687 32.5N 104.6W 2.0-3.9 AAAAA SW U.S.A
EASTERN U.S./CANADA
O: 03APR2021 19:39:51 35.1N 95.3W ML=2.4 EMSC OKLAHOMA
O: 04APR2021 00:46:45 35.1N 95.4W ML=2.4 EMSC OKLAHOMA
O: 3APR2021 10:12:17 35.1N 95.3W ML=2.2 EMSC OKLAHOMA
P: 2APR2021 132698 34.0N 93.0W 2.0-4.1 ABBAA Southeast U.S.
HAWAII
O: 03APR2021 21:01:55 19.3N 155.5W ML=4.0 EMSC ISLAND OF HAWAII, HAWAII
O: 03APR2021 21:15:22 19.3N 155.5W ML=4.3 EMSC ISLAND OF HAWAII, HAWAII
O: 3APR2021 10:54:30 19.2N 155.5W ML=3.0 EMSC ISLAND OF HAWAII, HAWAII
P: 4APR2021 132610 18.8N 155.2W 3.0-4.7 AAAAA Hawaii
STRONG QUAKE EAST OF SOUTH SANDWICH ISLANDS
EARTHQUAKE SUMMARY FOR APRIL 2, 2021
The largest earthquake in the world today was an M 6.6 in the South Atlantic east of the South Sandwich Islands. This is the strongest quake within about 500 km of this epicenter since an M 6.6 on May 23, 1995, the only such event in at least the past 30 years. It was preceded by an M 5.1 yesterday in the South Sandwich Islands. This summary in the previous issue noted the relation of this event in Kamchatka to the South Sandwich Islands as:
"A moderate earthquake of M 5.1 also continued the elevated seismicity in the South Sandwich Islands region today. This area became active (again) following the M 6.6 in the Kamchatka region of Russia on March 16. Seismic activation of the region had been expected as the area of the South Atlantic near the South Sandwich Islands is near the antipode of the M 6.6 in Kamchatka, the only quake of this magnitude since the events in New Zealand of March 4. This was discussed in this summary on March 17 as:
"The strongest earthquake in the world today was an M 6.6 off the coast of Kamchatka, Russia. NEIC reported it was felt with intensity V in Mohovaja, Kamchatka. This occurred near the antipode of the M 6.0 yesterday and was probably promoted by strong concentrated energy from that source in the South Sandwich Islands. Antipodal triggering can be important when large earthquakes are occurring." (March 17, 2021, April 1-2, 2021)
Kamchatka lies in the antipodal region of today's M 6.6 in the South Atlantic but other seismic areas which are antipodal are the Rat and Near Islands and the Komandorsky Island. These are likely to see enhanced seismicity in the next week.
Forecast 132831 had expected today's activity was likely in this region of the South Sandwich Islands around April 5 within about 200 km of today's epicenter.
O: 3APR2021 01:16:39 58.1S 7.9W Mw=6.6 EMSC EAST OF SOUTH SANDWICH ISLANDS
P: 5APR2021 132831 56.0S 7.0W 4.0-5.6 ACAAA Atlantic-Indian Ridge
The strongest earthquake in the U.S. or Canada today was an M 4.4 off the coast of Northern California. NEIC reported it was felt with intensity IV in Scotia and II-III in Ferndale, Whitethorn, Rio Dell, Hydesville, Garberville, Myers Flat, Redcrest, Mendocino and Bridgeville. This area has been active in recent days both to the east and west of today's epicenter. The last earthquake of M>=4.4 within about 100 km of today's epicenter was an M 4.7 on March 30, 2021 and this may be an aftershock of that quake. At the time this summary noted in this regard:
"The strongest earthquake in the U.S. or Canada today was an M 4.7 off the coast of northern California. NEIC reported it was lightly felt in California at Eureka, McKinleyville. This is the strongest earthquake off the coast of Northern California since an M 4.8 more than a year ago on March 22, 2020 - an aftershock of an M 5.8 on March 9, 2020." (March 30-31, 2021)
The only other event of M>=4.4 in this region in the past year was an M 4.4 about 50 km to the west on January 17, 2021. Forecast 132732 had expected today's event within about 10 km was likely around April 3.
O: 2APR2021 08:21:34 40.3N 124.6W mb=4.4 ANSS OFFSHORE NORTHERN CALIFORNIA
O: 2APR2021 08:21:34 40.3N 124.6W mb=4.2 EMSC OFFSHORE NORTHERN CALIFORNIA
P: 3APR2021 132732 40.3N 124.7W 2.5-4.4 AAAAA Off Coast of No. Calif
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 2APR2021 08:58:37 34.2N 87.7E mb=4.5 EMSC WESTERN XIZANG
P: 29MAR2021 132435 31.0N 88.0E 3.8-5.3 BCAAA Xizang
O: 2APR2021 07:55:53 35.7N 89.4E mb=4.7 EMSC WESTERN XIZANG
P: 6APR2021 132708 36.0N 93.0E 3.8-5.2 BACAA Xizang
O: 3APR2021 05:08:18 36.4N 69.1E mb=4.0 EMSC HINDU KUSH REGION, AFGHANISTAN
P: 26MAR2021 132388 37.0N 70.0E 3.8-5.5 CAAAA Hindu Kush/Pakistan
O: 2APR2021 21:07:49 52.0N 98.9E mb=4.2 EMSC RUSSIA-MONGOLIA BORDER REGION
P: 28MAR2021 132493 51.0N 98.0E 3.0-4.4 BAAAA So. Siberia
O: 2APR2021 07:36:25 41.2N 79.1E mb=4.1 EMSC SOUTHERN XINJIANG, CHINA
P: 29MAR2021 132447 40.0N 78.0E 4.0-5.4 BBAAA Kirgizstan/Xinjiang
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 2APR2021 07:52:21 0.4N 121.5E ML=4.2 EMSC MINAHASA, SULAWESI, INDONESIA
P: 6APR2021 132565 0.0N 120.0E 4.0-5.4 BABAA Celebes Sea
P: 31MAR2021 132329 1.0S 122.0E 4.0-5.4 ABAAA Sulawesi area
O: 3APR2021 05:36:26 1.2N 98.7E ML=4.2 EMSC NORTHERN SUMATRA, INDONESIA
P: 4APR2021 132577 1.0N 100.0E 4.0-5.4 AABAA So. Sumatera
P: 28MAR2021 132311 0.0N 99.0E 4.0-5.4 BBAAA So. Sumatera
O: 3APR2021 03:54:34 1.5N 127.1E ML=4.6 EMSC HALMAHERA, INDONESIA
P: 6APR2021 132572 1.0N 127.0E 4.0-5.5 BAAAA Halmahera
P: 28MAR2021 132307 2.0N 127.0E 4.0-5.6 BAAAA Halmahera
O: 3APR2021 00:51:12 2.2N 96.0E ML=4.3 EMSC SIMEULUE, INDONESIA
P: 26MAR2021 132310 2.0N 96.0E 4.0-5.5 CAAAA Nicobar Islands
O: 2APR2021 20:09:58 2.7S 138.6E ML=4.2 EMSC PAPUA, INDONESIA
P: 26MAR2021 132332 3.0S 139.0E 4.0-5.6 CAAAA West Irian, PNG
O: 2APR2021 10:51:03 3.3N 127.5E mb=4.5 EMSC KEPULAUAN TALAUD, INDONESIA
P: 28MAR2021 132307 2.0N 127.0E 4.0-5.6 BBAAA Halmahera
O: 2APR2021 16:47:50 5.7S 130.9E ML=4.0 EMSC BANDA SEA
P: 29MAR2021 132333 6.0S 131.0E 4.0-5.4 BAAAA West Irian, PNG
O: 2APR2021 15:42:19 7.4S 129.5E ML=4.2 EMSC KEPULAUAN BABAR, INDONESIA
P: 30MAR2021 132313 7.0S 129.0E 4.0-5.4 BAAAA Banda Sea
No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.
CENTRAL AND SOUTH AMERICA
O: 2APR2021 23:57 31.8S 71.3W mb=4.3 GUC Coquimbo at Combarbala, Illape
P: 4APR2021 132813 33.0S 71.0W 4.0-5.8 ABAAA Central Chile
P: 29MAR2021 132541 32.0S 70.0W 4.0-5.6 BAAAA Central Chile
GUC reported this earthquake was felt with intensity IV in Coquimbo at Combarbala, Illapel and Salamanca, Chile.
O: 2APR2021 22:44:01 7.4N 77.0W mb=5.0 EMSC NORTHERN COLOMBIA
P: 26MAR2021 132303 7.0N 78.0W 4.0-5.5 CAAAA Colombia
NEIC reported this earthquake of M 5.0 in Colombia was felt with intensity II-III in the area(s) of Colombia at Envifado and Jardin, Antioquia and Cartagena, Bolivar and V in San Miguelito, Panama.
O: 2APR2021 08:35:25 14.7N 94.0W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
P: 3APR2021 132604 14.0N 93.0W 3.5-5.1 AAAAA Chiapas, Mexico
O: 2APR2021 07:41:03 15.2N 93.4W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
P: 3APR2021 132604 14.0N 93.0W 3.5-5.1 ABAAA Chiapas, Mexico
O: 3APR2021 02:06:39 17.6N 95.0W ML=4.2 EMSC VERACRUZ, MEXICO
P: 5APR2021 132605 17.0N 95.0W 3.5-5.3 AAAAA Chiapas, Mexico
O: 02APR2021 23:22:51 17.9N 66.8W ML=3.2 EMSC PUERTO RICO REGION
O: 2APR2021 19:14:26 18.0N 66.9W Md=3.1 EMSC PUERTO RICO
P: 3APR2021 132622 18.0N 66.0W 3.4-4.9 AAAAA Puerto Rico
O: 2APR2021 09:04:09 18.5N 69.1W ML=3.1 EMSC DOMINICAN REPUBLIC
P: 2APR2021 132623 18.0N 69.0W 3.4-5.2 AAAAA Puerto Rico
O: 2APR2021 10:50:11 19.2N 65.0W Md=3.6 EMSC VIRGIN ISLANDS REGION
P: 28MAR2021 132356 20.0N 65.0W 3.0-4.6 BAAAA Bahamas/No. Caribbean
O: 2APR2021 17:56:25 28.5S 67.6W ML=4.0 EMSC LA RIOJA, ARGENTINA
P: 6APR2021 132798 29.0S 68.0W 4.0-5.6 BAAAA Argentina
P: 26MAR2021 132529 28.0S 68.0W 4.0-5.4 CAAAA Argentina
O: 2APR2021 23:57:42 31.8S 71.5W mb=4.4 EMSC COQUIMBO, CHILE
P: 5APR2021 132813 32.0S 71.0W 4.0-5.9 BAAAA Central Chile
O: 3APR2021 05:55:42 20.2N 72.3W ML=3.3 EMSC HAITI REGION
P: 4APR2021 132628 20.0N 71.0W 3.0-4.6 AAAAA Bahamas/No. Caribbean
AFRICA AND EUROPE
O: 3APR2021 06:10:10 35.1N 22.7E mb=4.6 EMSC CENTRAL MEDITERRANEAN SEA
P: 2APR2021 132676 36.0N 22.0E 3.0-4.5 AAAAA No. Greece
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 2APR2021 15:50:19 21.7S 179.4W mb=4.6 EMSC FIJI REGION
P: 1APR2021 132809 20.0S 179.0W 4.0-5.5 ABAAA Tonga Islands
P: 5APR2021 132809 21.0S 178.0W 4.0-5.7 BAAAA Tonga Islands
No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.
OCEAN RIDGES
O: 2APR2021 08:26:36 52.7N 32.0W mb=4.5 EMSC REYKJANES RIDGE
P: 27MAR2021 132489 52.0N 30.0W 4.0-5.6 CAAAA North Mid-Atlantic Ridge
O: 3APR2021 01:16:39 58.1S 7.9W Mw=6.6 EMSC EAST OF SOUTH SANDWICH ISLANDS
P: 5APR2021 132831 56.0S 7.0W 4.0-5.6 ACAAA Atlantic-Indian Ridge
ZEALANDIA AND AUSTRALIA REGION
O: 3APR2021 01:18:31 29.1S 176.3W mb=4.9 EMSC KERMADEC ISLANDS REGION
P: 3APR2021 132802 29.0S 177.0W 4.0-5.4 AAAAA No. Kermadec Islands
O: 2APR2021 16:27:40 35.2S 179.5E ML=4.0 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 25MAR2021 132547 35.0S 179.0E 3.0-4.5 CAAAA North Island, N.Z.
O: 02APR2021 07:05:53 37.7S 179.7E mb=4.6 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 02APR2021 07:05:56 37.7S 179.7E ML=4.7 GEONET Felt with weak intensity
O: 3APR2021 03:37:22 37.5S 179.9E ML=3.5 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 5APR2021 132819 38.0S 177.0E 3.0-4.6 AABAA North Island, N.Z.
GEONET reported this earthquake was felt with weak intensity in North Island, New Zealand with 4 reports of which 3 reported weak shaking; 1 light, 0 moderate, 0 strong, 0 Severe and 0 extreme intensity.
O: 2APR2021 15:54:29 39.8S 176.5E ML=3.8 EMSC NORTH ISLAND OF NEW ZEALAND
P: 4APR2021 132826 41.0S 175.0E 3.0-5.3 ABAAA So. Island, N.Z.
JAPAN AND KURIL ISLANDS
O: 2APR2021 11:24:04 27.1N 140.3E mb=4.5 EMSC BONIN ISLANDS, JAPAN REGION
P: 25MAR2021 132357 28.0N 142.0E 4.0-5.4 CABAA Bonin Islands
P: 31MAR2021 132357 29.0N 139.0E 4.0-5.5 ABAAA Bonin Islands
O: 2APR2021 16:36:30 37.7N 142.0E mb=4.2 EMSC NEAR EAST COAST OF HONSHU, JAP
P: 28MAR2021 132405 38.0N 141.0E 4.0-5.7 BAAAA Off East Coast Honshu
O: 2APR2021 12:11:52 47.4N 151.9E mb=4.2 EMSC KURIL ISLANDS
P: 31MAR2021 132470 48.0N 153.0E 3.5-5.6 AAAAA So. Kurils
O: 2APR2021 22:30:15 48.5N 155.6E mb=4.7 EMSC KURIL ISLANDS
P: 5APR2021 132727 48.0N 155.0E 3.5-5.8 BAAAA NE Pacific
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 2APR2021 11:54:04 34.3N 117.2W Ml=2.2 EMSC SOUTHERN CALIFORNIA
P: 3APR2021 132691 34.2N 117.8W 2.5-4.6 AAAAA So. California
P: 29MAR2021 132416 34.1N 117.4W 2.5-4.5 BAAAA So. California
O: 2APR2021 21:15:09 33.4N 118.3W Ml=2.3 EMSC SAN PEDRO CHANNEL, CALIFORNIA
P: 4APR2021 132693 34.0N 118.7W 2.5-4.8 AAAAA So. California
P: 24MAR2021 132415 33.9N 118.3W 2.5-4.5 CAAAA So. California
O: 2APR2021 19:10:52 35.7N 121.3W ML=2.6 EMSC CENTRAL CALIFORNIA
P: 3APR2021 132684 35.7N 121.2W 2.5-4.6 AAAAA Off So. California
O: 2APR2021 09:34:44 36.6N 121.2W Md=2.5 EMSC CENTRAL CALIFORNIA
P: 2APR2021 132659 36.6N 120.7W 2.5-4.8 AAAAA Central California
P: 29MAR2021 132382 36.4N 121.0W 2.5-4.7 BAAAA Central California
NEIC reported this earthquake of M 2.5 in Central California was felt with intensity II-III in the area(s) of Central California in San Juan Bautista, Los Banos and Marina.
O: 02APR2021 19:08:02 38.2N 117.9W ML=4.0 EMSC NEVADA
O: 02APR2021 19:08:02 38.2N 117.9W ML=4.3 ANSS NEVADA
O: 02APR2021 19:26:30 38.2N 117.9W ml=2.4 EMSC NEVADA
O: 2APR2021 17:10:08 38.2N 117.9W ML=3.4 EMSC NEVADA
P: 3APR2021 132654 37.8N 118.2W 2.5-4.8 AAAAA California/Nevada area
NEIC reported this earthquake of M 4.3 in Nevada was felt with intensity II-III in the area(s) of Nevada at Tonopah and Glenbrook.
O: 2APR2021 08:21:34 40.3N 124.6W mb=4.2 EMSC OFFSHORE NORTHERN CALIFORNIA
O: 02APR2021 09:19:19 40.3N 124.9W Md=2.5 EMSC OFFSHORE NORTHERN CALIFORNIA
P: 3APR2021 132732 40.3N 124.7W 2.5-4.4 AAAAA Off Coast of No. Calif
ALASKA
O: 3APR2021 02:57:10 54.3N 159.7W mb=4.0 EMSC SOUTH OF ALASKA
P: 4APR2021 132747 54.7N 156.9W 3.5-5.2 AABAA Alaska Peninsula
P: 27MAR2021 132477 54.8N 159.7W 3.5-5.1 CAAAA Alaska Peninsula
O: 2APR2021 22:19:25 59.7N 153.1W ML=3.2 EMSC SOUTHERN ALASKA
P: 5APR2021 132770 60.3N 153.0W 3.2-5.0 BAAAA Central Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 2APR2021 17:20:25 51.7N 131.7W MB=3.7 ECAN Village of Queen Charlotte, BC
P: 2APR2021 132741 49.9N 130.2W 2.8-5.2 ACAAA Vancouver Island area
P: 27MAR2021 132482 50.5N 130.4W 3.0-5.0 BBAAA British Colombia
ROCKY MOUNTAINS REGION
O: 02APR2021 11:33:39 32.1N 102.1W mb=2.2 EMSC WESTERN TEXAS
O: 2APR2021 10:43:30 32.1N 102.1W mb=2.6 EMSC WESTERN TEXAS
P: 3APR2021 132687 32.5N 104.6W 2.0-3.9 AABAA SW U.S.A
NEIC reported this earthquake of M 2.5 in Western Texas was felt with intensity IV in the area(s) of Western Texas at Midland.
O: 2APR2021 09:04:21 44.3N 115.2W Ml=2.0 EMSC SOUTHERN IDAHO
P: 3APR2021 132723 44.6N 116.0W 2.0-4.2 AAAAA Montana/Idaho
EASTERN U.S./CANADA
O: 2APR2021 10:05:24 35.1N 95.4W ML=2.2 EMSC OKLAHOMA
P: 27MAR2021 132426 35.0N 96.0W 2.0-4.1 BAAAA Southern Plains
O: 2APR2021 20:08:56 36.1N 97.6W ML=2.0 EMSC OKLAHOMA
P: 2APR2021 132699 35.0N 97.0W 2.0-4.1 ABAAA Southern Plains
P: 26MAR2021 132427 37.0N 98.0W 2.0-4.2 CAAAA Southern Plains
HAWAII
No earthquakes of M>=3 were located in Hawaii.
STRONG QUAKES RETURN TO SOUTHWEST PACIFIC
EARTHQUAKE SUMMARY FOR APRIL 1, 2021
It has been one lunar month (28-29 days) since the M 8.1 in the Kermadec Islands and the M 7.3 north of North Island, New Zealand of March 4. If tidal promotion was likely (as suspected) in those events, the area might be expected to see significant seismicity a lunar month later. The series in New Zealand was quite active in the first two weeks following March 4, and in the past two weeks has reduced to relatively insignificant regional seismicity. So increased seismicity in the area today, while surprising to some, should come as no surprise. The strongest earthquakes of the day were an M 6.3 in the Kermadec Islands aftershock zone and an M 6.0 north of this in the Fiji Islands.
The M 6.3 in the Kermadec Islands was not felt in this remote area. It is the strongest aftershock to date of the M 8.1 and 7.4 quakes that hit the area on March 4, 2021. It occurred about 100 km south of those epicenter but is part of the aftershock sequence in the area. This event was followed by an M 5.6 and an M 4.5 aftershock and an M 5.1 further to the north in the Kermadec Islands. Forecasts 132546 and 132819 had expected seismic enhancement in this area at the end of March or in early April.
O: 1APR2021 09:56:36 30.0S 177.7W Mw=6.3 EMSC KERMADEC ISLANDS, NEW ZEALAND
O: 01APR2021 11:58:32 30.0S 176.6W mb=4.5 EMSC KERMADEC ISLANDS REGION
O: 01APR2021 22:10:14 30.0S 177.4W Mw=5.6 EMSC KERMADEC ISLANDS, NEW ZEALAND
P: 2APR2021 132819 30.0S 179.0W 4.0-5.9 AAAAA No. Kermadec Islands
P: 29MAR2021 132546 30.0S 178.0W 4.0-5.4 AAAAA No. Kermadec Islands
An M 6.0 also occurred today in the Fiji Islands. NEIC reported it was felt as far as Namosi, Central Fiji Islands with intensity III. The last earthquake of M>=6.0 in the Fiji Islands within about 200 km of this epicenter was an M 6.0 on July 21, 2020. The last of larger magnitude was an M 6.5 near today's epicenter on November 8, 2019. Today's event may be an aftershock of the November, 2019 quake. Forecasts 132809 and 132540 had expected today's activity was likely at the end of March or early April in this region.
O: 1APR2021 15:11:18 21.9S 179.3W Mw=6.0 EMSC FIJI REGION
P: 1APR2021 132809 20.0S 179.0W 4.0-5.5 ABAAA Tonga Islands
P: 27MAR2021 132540 23.0S 177.0W 4.0-5.6 ABBAA Tonga Islands
A moderate earthquake of M 5.1 also continued the elevated seismicity in the South Sandwich Islands region today. This area became active (again) following the M 6.6 in the Kamchatka region of Russia on March 16. Seismic activation of the region had been expected as the area of the South Atlantic near the South Sandwich Islands is near the antipode of the M 6.6 in Kamchatka, the only quake of this magnitude since the events in New Zealand of March 4. This was discussed in this summary on March 17 as:
"The strongest earthquake in the world today was an M 6.6 off the coast of Kamchatka, Russia. NEIC reported it was felt with intensity V in Mohovaja, Kamchatka. This occurred near the antipode of the M 6.0 yesterday and was probably promoted by strong concentrated energy from that source in the South Sandwich Islands. Antipodal triggering can be important when large earthquakes are occurring." (March 17, 2021)
The last earthquake in the South Sandwich Islands of M>=5.1 was an M 6.0 on March 14. Forecast 132563 had expected today's activity at the end of March. Only one quake of M>6.0 has occurred in the South Sandwich Islands in the past year - an M 6.4 on July 26, 2020.
O: 1APR2021 22:02:14 59.5S 26.2W mb=5.1 EMSC SOUTH SANDWICH ISLANDS REGION
P: 25MAR2021 132563 60.0S 26.0W 4.0-5.8 CAAAA So. Sandwich Islands
P: 28MAR2021 132563 61.0S 26.0W 4.0-5.6 BBAAA Southern Ocean
An unusual earthquake of M 3.0 occurred today on the border between northern Louisiana and Texas. NEIC reported it was felt with maximum intensity V in Plain Dealing, Louisiana and II-III in Louisiana at Mooringsport, Shreveport, Bossier City, Stonewall, Haughton, and in Texas at Daingerfield and Kilgore. An area about 100 km south of this in Louisiana was active from May, 2012 to January, 2019, but the last event within about 100 km of this epicenter with M>=4 appears to have been an M 3.0 20 years ago on March 3, 2001. Forecast 132698 had expected regional seismic enhancement in early April, 2021.
O: 1APR2021 07:26:25 32.6N 94.0W mb=3.0 EMSC LOUISIANA
P: 2APR2021 132698 34.0N 93.0W 2.0-4.1 ABAAA Southeast U.S.
The strongest earthquake in the U.S. or Canada today was an M 4.0 in western
Texas. NEIC reported this earthquake of M 3.9-4.0 in Western Texas was felt with intensity II-III in the area(s) of Las Cruces, New Mexico. A foreshock of M 2.7 was reported with intensity II in Carlsbad, New Mexico. This appears to be the strongest aftershock to date of the M 4.5 which hit this area on March 17. Forecast 132409 had expected today's activity within about 50 km was likely at the end of March. This epicenter is at 101 degrees from the M 8.1 in the Northern Kermadec Islands of March 4 and was probably promoted by energy from that source.
O: 01APR2021 19:49:55 31.7N 104.4W ML=4.0 EMSC WESTERN TEXAS
O: 1APR2021 07:38:42 31.7N 104.4W ML=2.6 EMSC WESTERN TEXAS
P: 25MAR2021 132409 32.2N 104.1W 2.0-4.1 CAAAA SW U.S.A
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 2APR2021 05:50:56 22.5N 121.1E ML=4.0 TAI Hualien, Taiwan
P: 30MAR2021 132370 22.0N 122.0E 4.0-5.6 BAAAA Taiwan
CWB reported this earthquake was felt with intensity III in Taitung and I in Pingtung Counties, Taiwan.
O: 01APR2021 12:04:52 37.6N 70.5E mb=4.3 EMSC HINDU KUSH REGION, AFGHANISTAN
O: 1APR2021 16:51:09 36.7N 70.9E mb=4.1 EMSC HINDU KUSH REGION, AFGHANISTAN
P: 26MAR2021 132388 37.0N 70.0E 3.8-5.5 CAAAA Hindu Kush/Pakistan
O: 1APR2021 19:20:07 40.9N 79.1E mb=4.7 EMSC SOUTHERN XINJIANG, CHINA
P: 29MAR2021 132447 40.0N 78.0E 4.0-5.4 AAAAA Kirgizstan/Xinjiang
INDONESIA AND PHILIPPINES
O: 1APR2021 08:58:19 0.1S 122.9E mb=4.4 EMSC SULAWESI, INDONESIA
P: 31MAR2021 132329 1.0S 122.0E 4.0-5.4 AAAAA Sulawesi area
O: 1APR2021 13:55:09 1.8N 127.3E mb=4.6 EMSC HALMAHERA, INDONESIA
P: 28MAR2021 132307 2.0N 127.0E 4.0-5.6 BAAAA Halmahera
O: 01APR2021 12:44:53 4.4N 127.5E ML=4.3 EMSC KEPULAUAN TALAUD, INDONESIA
O: 1APR2021 10:12:24 3.7N 126.8E mb=5.4 EMSC KEPULAUAN TALAUD, INDONESIA
P: 24MAR2021 132309 2.0N 126.0E 4.0-5.6 CBAAA Mindanao, Philippines
O: 1APR2021 22:51:35 7.2S 129.4E mb=4.3 EMSC KEPULAUAN BABAR, INDONESIA
P: 30MAR2021 132313 7.0S 129.0E 4.0-5.4 AAAAA Banda Sea
CENTRAL AND SOUTH AMERICA
O: 1APR2021 10:50:14 13.9S 72.7W ML=4.3 EMSC CENTRAL PERU
P: 25MAR2021 132513 15.0S 71.0W 4.0-6.1 CABAA Central Peru
O: 1APR2021 17:06:47 15.1N 93.1W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
P: 28MAR2021 132342 14.0N 92.0W 3.5-5.3 BBBAA Guatemala
O: 1APR2021 08:35:32 15.2N 94.6W ML=4.0 EMSC OFF COAST OF OAXACA, MEXICO
P: 31MAR2021 132339 17.0N 95.0W 3.5-5.3 ABAAA Chiapas, Mexico
O: 1APR2021 13:03:11 15.9N 98.2W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO
P: 30MAR2021 132353 17.0N 98.0W 3.5-5.3 ABAAA Oaxaca, Mexico
O: 02APR2021 04:19:23 19.0N 69.1W ML=3.3 EMSC DOMINICAN REPUBLIC REGION
O: 1APR2021 18:40:57 18.6N 69.1W ML=3.0 EMSC DOMINICAN REPUBLIC
O: 2APR2021 02:50:34 20.3N 70.9W ML=3.2 EMSC DOMINICAN REPUBLIC REGION
P: 26MAR2021 132354 19.0N 71.0W 3.4-5.3 CAAAA Puerto Rico
O: 2APR2021 02:56:15 20.9S 69.3W mb=4.2 EMSC TARAPACA, CHILE
P: 29MAR2021 132538 20.0S 70.0W 4.0-5.4 BAAAA So. Peru/Bolivia
NEIC reported this earthquake of M 4.2 in Northern Chile was felt with intensity II-III in the area(s) of Northern Chile at Iquique, Tarapaca.
O: 2APR2021 05:47:47 33.2S 67.3W ML=4.1 EMSC MENDOZA, ARGENTINA
P: 29MAR2021 132541 32.0S 70.0W 4.0-5.6 BBBAA Central Chile
O: 2APR2021 03:42:41 34.7S 71.0W mb=4.4 EMSC LIBERTADOR O'HIGGINS, CHILE
P: 3APR2021 132813 34.0S 71.0W 4.0-5.8 AAAAA Central Chile
P: 25MAR2021 132542 35.0S 73.0W 4.0-6.0 CABAA Central Chile
NEIC reported this earthquake of M 4.4 in O'Higgins, Chile was felt with intensity II-III in the area(s) of O'Higgins, Chile at San Vicente and in Curico, Maule.
AFRICA AND EUROPE
O: 1APR2021 12:33:40 36.2N 26.5E ML=4.4 EMSC DODECANESE ISLANDS, GREECE
P: 29MAR2021 132372 36.0N 27.0E 3.0-4.8 AAAAA Aegean Sea
O: 1APR2021 14:33:35 36.5N 7.2E mb=4.8 EMSC NORTHERN ALGERIA
P: 2APR2021 132707 37.0N 7.0E 3.0-4.5 AAAAA Western Mediterranean
P: 24MAR2021 132434 37.0N 5.0E 3.0-4.6 CABAA Western Mediterranean
NEIC reported this earthquake of M 4.8 in Algeria was felt with intensity II-III in the area(s) of Algeria with intensity VII in Qalmah, V in Wed-Zenati, IV in Heliopolis and III in Bona, Annabah. It is not likely a classical aftershock of the strong quake in Algeria in March as it occurred several hundred km to the east of that epicenter.
O: 1APR2021 20:11:30 66.6N 17.8W ML=3.8 EMSC ICELAND REGION
O: 01APR2021 20:24:08 66.6N 17.9W ML=3.4 EMSC ICELAND REGION
SOUTHWEST PACIFIC
O: 2APR2021 03:06:34 16.2S 168.1E mb=4.6 EMSC VANUATU
P: 3APR2021 132796 17.0S 168.0E 4.0-5.5 AAAAA Vanuatu Islands
P: 23MAR2021 132527 17.0S 168.0E 4.0-5.6 CAAAA Vanuatu Islands
O: 1APR2021 15:11:18 21.9S 179.3W Mw=6.0 EMSC FIJI REGION
P: 1APR2021 132809 20.0S 179.0W 4.0-5.5 ABAAA Tonga Islands
P: 27MAR2021 132540 23.0S 177.0W 4.0-5.6 ABBAA Tonga Islands
OCEAN RIDGES
O: 1APR2021 18:03:05 7.9S 67.6E mb=4.6 EMSC MID-INDIAN RIDGE
O: 1APR2021 22:02:14 59.5S 26.2W mb=5.1 EMSC SOUTH SANDWICH ISLANDS REGION
P: 25MAR2021 132563 60.0S 26.0W 4.0-5.8 CAAAA So. Sandwich Islands
P: 28MAR2021 132563 61.0S 26.0W 4.0-5.6 BBAAA Southern Ocean
ZEALANDIA AND AUSTRALIA REGION
O: 2APR2021 04:36:51 29.6S 177.0W mb=5.1 EMSC KERMADEC ISLANDS REGION
P: 29MAR2021 132533 29.0S 177.0W 4.0-5.4 BAAAA No. Kermadec Islands
O: 1APR2021 09:56:36 30.0S 177.7W Mw=6.3 EMSC KERMADEC ISLANDS, NEW ZEALAND
O: 01APR2021 11:58:32 30.0S 176.6W mb=4.5 EMSC KERMADEC ISLANDS REGION
O: 01APR2021 22:10:14 30.0S 177.4W Mw=5.6 EMSC KERMADEC ISLANDS, NEW ZEALAND
P: 2APR2021 132819 30.0S 179.0W 4.0-5.9 AAAAA No. Kermadec Islands
P: 29MAR2021 132546 30.0S 178.0W 4.0-5.4 AAAAA No. Kermadec Islands
O: 1APR2021 21:16:42 35.6S 179.6E ML=3.9 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 25MAR2021 132547 35.0S 179.0E 3.0-4.5 CAAAA North Island, N.Z.
O: 1APR2021 22:12:05 37.8S 178.2E ML=3.7 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 27MAR2021 132548 37.0S 178.0E 3.0-4.9 BAAAA North Island, N.Z.
JAPAN AND KURIL ISLANDS
No earthquakes of M>=4 were located in Japan or the Kuril Islands today.
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 1APR2021 15:18:38 32.4N 115.2W Ml=2.6 EMSC BAJA CALIFORNIA, MEXICO
O: 1APR2021 20:45:22 32.8N 116.1W Ml=2.9 EMSC SOUTHERN CALIFORNIA
P: 29MAR2021 132411 32.5N 115.7W 2.5-4.4 AAAAA So. California
O: 02APR2021 02:52:14 33.1N 115.7W Ml=2.2 EMSC SOUTHERN CALIFORNIA
O: 2APR2021 04:15:18 33.5N 116.6W Ml=2.0 EMSC SOUTHERN CALIFORNIA
P: 4APR2021 132690 33.7N 116.1W 2.5-4.5 AAAAA So. California
O: 1APR2021 12:52:52 34.1N 118.1W ML=2.8 EMSC GREATER LOS ANGELES AREA, CALI
P: 29MAR2021 132415 34.0N 118.7W 2.5-4.6 AAAAA So. California
NEIC reported this earthquake of M 3.0 in Los Angeles, California was felt with intensity IV in the area(s) of Huntington Park and Maywood, Los Angeles, California.
O: 01APR2021 18:02:19 36.1N 117.8W Ml=2.3 EMSC CENTRAL CALIFORNIA
O: 1APR2021 09:50:42 36.0N 117.5W Ml=2.1 EMSC CENTRAL CALIFORNIA
P: 29MAR2021 132375 36.3N 118.1W 2.5-4.8 AAAAA California/Nevada area
O: 2APR2021 04:54:30 36.1N 120.6W Md=2.3 EMSC CENTRAL CALIFORNIA
P: 28MAR2021 132381 36.1N 120.1W 2.5-4.9 BAAAA Central California
P: 29MAR2021 132382 36.4N 121.0W 2.5-4.7 BAAAA Central California
O: 1APR2021 20:16:04 36.5N 118.0W Ml=2.1 EMSC CENTRAL CALIFORNIA
P: 29MAR2021 132375 36.3N 118.1W 2.5-4.8 AAAAA California/Nevada area
O: 01APR2021 19:54:54 37.8N 122.1W Md=3.0 EMSC SAN FRANCISCO BAY AREA, CALIF.
O: 1APR2021 16:50:34 37.7N 121.9W Md=2.1 EMSC SAN FRANCISCO BAY AREA, CALIF.
P: 3APR2021 132661 37.9N 122.0W 2.5-4.5 AAAAA Central California
O: 2APR2021 06:40:42 37.9N 118.6W ml=2.1 EMSC CENTRAL CALIFORNIA
P: 28MAR2021 132377 37.8N 118.2W 2.5-4.8 BAAAA California/Nevada area
O: 2APR2021 06:01:59 38.2N 117.9W ml=2.5 EMSC NEVADA
P: 28MAR2021 132377 37.8N 118.2W 2.5-4.8 BAAAA California/Nevada area
O: 1APR2021 21:41:38 38.8N 122.7W Md=2.4 EMSC NORTHERN CALIFORNIA
P: 31MAR2021 132383 38.7N 122.7W 2.5-4.5 AAAAA Central California
O: 2APR2021 03:23:59 39.2N 120.1W ml=2.1 EMSC NORTHERN CALIFORNIA
P: 3APR2021 132656 39.3N 120.0W 2.5-4.6 AAAAA California/Nevada area
NEIC reported this earthquake of M 2.7 in Lake Tahoe, California was felt with intensity II-III in the area(s) of Lake Tahoe, California at Camelian Bay, Tahoe Vista, Kings Beach, Olympic Valley, Tahoe, Truckee and Reno.
O: 1APR2021 15:22:35 40.5N 124.6W Md=2.9 EMSC OFFSHORE NORTHERN CALIFORNIA
P: 28MAR2021 132460 40.2N 124.2W 2.5-4.4 BAAAA Off Coast of No. Calif
ALASKA
O: 2APR2021 02:06:17 60.1N 152.0W ML=3.4 EMSC SOUTHERN ALASKA
P: 25MAR2021 132500 60.1N 153.4W 3.2-4.9 CAAAA Central Alaska
O: 2APR2021 01:56:38 63.2N 151.2W ML=3.0 EMSC CENTRAL ALASKA
P: 7APR2021 132770 63.2N 151.4W 3.2-5.1 BAAAA Central Alaska
P: 25MAR2021 132503 63.2N 151.4W 3.2-5.0 CAAAA Central Alaska
O: 1APR2021 17:09:12 63.4N 147.7W ML=3.5 EMSC CENTRAL ALASKA
P: 29MAR2021 132499 60.6N 147.6W 3.2-5.3 AAAAA Central Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 1APR2021 10:35:20 44.3N 124.5W Ml=2.0 EMSC OFFSHORE OREGON
P: 22MAR2021 132461 42.5N 126.8W 3.0-4.8 CBBAA Off Coast of Oregon
ROCKY MOUNTAINS REGION
O: 01APR2021 19:49:55 31.7N 104.4W ML=4.0 EMSC WESTERN TEXAS
O: 1APR2021 07:38:42 31.7N 104.4W ML=2.6 EMSC WESTERN TEXAS
P: 25MAR2021 132409 32.2N 104.1W 2.0-4.1 CAAAA SW U.S.A
O: 02APR2021 02:31:48 38.3N 113.1W Ml=2.3 EMSC UTAH
O: 01APR2021 11:37:01 38.4N 113.1W Ml=2.1 EMSC UTAH
O: 01APR2021 12:33:35 38.4N 113.1W Ml=2.1 EMSC UTAH
O: 1APR2021 09:07:43 38.3N 113.1W Ml=2.4 EMSC UTAH
P: 29MAR2021 132432 38.7N 112.6W 2.0-3.9 AAAAA Utah area
O: 1APR2021 14:29:16 44.4N 115.2W Ml=2.9 EMSC SOUTHERN IDAHO
P: 27MAR2021 132451 44.5N 114.7W 2.0-4.3 BAAAA Montana/Idaho
EASTERN U.S./CANADA
O: 1APR2021 07:26:25 32.6N 94.0W mb=3.0 EMSC LOUISIANA
P: 2APR2021 132698 34.0N 93.0W 2.0-4.1 ABAAA Southeast U.S.
O: 02APR2021 05:26:17 34.4N 97.4W mb=2.7 EMSC OKLAHOMA
O: 1APR2021 11:07:44 34.4N 97.6W ML=2.9 EMSC OKLAHOMA
P: 2APR2021 132699 35.0N 97.0W 2.0-4.1 AAAAA Southern Plains
NEIC reported this earthquake of M 2.7 in Southern Oklahoma was felt with intensity II-III in the area(s) of Southern Oklahoma at Duncan.
The other earthquake of M 2.9 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma at Purcell.
O: 1APR2021 23:59:42 36.4N 89.5W Md=2.1 EMSC SOUTHEASTERN MISSOURI
P: 27MAR2021 132396 36.7N 89.7W 2.0-3.9 BAAAA New Madrid area
O: 2APR2021 05:39:35 37.6N 97.2W mb=2.1 EMSC KANSAS
P: 26MAR2021 132427 37.0N 98.0W 2.0-4.2 CAAAA Southern Plains
O: 1APR2021 06:28:10 47.0N 66.6W MB=2.1 ECAN Plaster Rock, NB
P: 27MAR2021 132448 47.0N 69.0W 2.0-4.0 ABAAA Maine
O: 1APR2021 02:38:30 48.8N 67.3W MB=2.3 ECAN Matane, QC
P: 31MAR2021 132442 49.0N 66.0W 2.0-3.9 AAAAA E. of Maine
O: 1APR2021 01:48:56 49.0N 92.3W MB=1.3 ECAN Atikokan, ON
O: 01APR2021 03:48:21 49.0N 92.2W MB=1.0 ECAN Atikokan, ON
O: 01APR2021 03:46:48 49.1N 92.2W MB=1.5 ECAN Atikokan, ON
O: 31MAR2021 19:06:57 50.3N 66.2W MB=2.5 ECAN Sept-Iles, QC
P: 31MAR2021 132442 49.0N 66.0W 2.0-3.9 ABAAA E. of Maine
O: 31MAR2021 04:20:06 45.7N 73.0W MB=2.1 ECAN Saint-Hyacinthe, QC
P: 27MAR2021 132455 44.0N 73.0W 2.0-4.1 BBAAA New England
HAWAII
O: 01APR2021 17:53:05 19.2N 155.6W ML=3.3 EMSC ISLAND OF HAWAII, HAWAII
O: 1APR2021 11:02:09 19.4N 155.6W ML=3.3 EMSC ISLAND OF HAWAII, HAWAII
P: 25MAR2021 132360 19.4N 155.1W 4.0-5.5 CABAA Hawaii area
NEIC reported this earthquake of M 3.2 in Hawaii was felt with intensity II-III in the area(s) of Hawaii at Pahala, Naalehu, Captain Cook, Hilo and Pearl City. An earlier M 3.1 was felt with intensity II in Captain Cook, Hawaii.
UNUSUALLY LARGE QUAKE SHAKES BAJA CALIFORNIA
EARTHQUAKE SUMMARY FOR MARCH 31, 2021
The strongest earthquake in the U.S. or California today was an M 4.8 in Baja California. NEIC reported this earthquake was felt with intensity IV in Baja California at Delta, Tecolotes and in Somerton, Arizona with IV. Lesser shaking of intensity II-III was felt in Baja California at Reacomodo, Puebla, Mexical, Progreso, and in California at Heber and Calexico. It was followed by a series of light aftershocks. It occurred within about an hour of local solar midnight and was probably promoted by high tidal stresses with the full moon which maximize near this hour. The only event within about 100 km of this epicenter in the past four years of significantly larger magnitude was an M 5.2 on June 10, 2016 and prior to that an M 5.5 on August 25, 2012. Events of M 4.8-4.9
also occurred in the area on October 1, 2020 and November 19, 2018. Forecast 132410 had expected today's event was likely within about 50 km around March 29.
O: 31MAR2021 09:34:50 32.4N 115.2W Ml=2.2 EMSC BAJA CALIFORNIA, MEXICO
O: 31MAR2021 09:38:54 32.4N 115.3W ML=2.7 EMSC BAJA CALIFORNIA, MEXICO
O: 31MAR2021 17:53:32 32.4N 115.2W Ml=2.5 EMSC BAJA CALIFORNIA, MEXICO
O: 31MAR2021 18:42:18 32.4N 115.2W Ml=3.0 EMSC BAJA CALIFORNIA, MEXICO
O: 31MAR2021 07:38:18 33.2N 115.7W Ml=2.3 EMSC SOUTHERN CALIFORNIA
O: 31MAR2021 08:56:24 32.3N 115.3W mb=4.3 EMSC BAJA CALIFORNIA, MEXICO
O: 31MAR2021 08:56:25 32.3N 115.3W mb=4.8 ANSS BAJA CALIFORNIA, MEXICO
P: 29MAR2021 132410 32.4N 115.8W 2.5-4.5 AAAAA So. California
The strongest seismicity in the world today occurred in Ocean Ridge areas. These included an M 5.1 in the Owen Fracture Zone south of Iran; an M 4.7 in the Mid-Indian Ridge and the strongest - an M 5.2 in the Ascension Island region of the central Atlantic. None of these were reported felt in these remote areas. Two earthquakes of M 5.2 each have occurred in the Owen Fracture Zone in the past year - on December 28, 2020 and on August 25, 2020. Today's event had been expected in late March within about 50 km of today's epicenter.
O: 31MAR2021 19:16:23 14.5N 56.3E mb=5.1 EMSC OWEN FRACTURE ZONE REGION
P: 23MAR2021 132335 15.0N 56.0E 3.5-5.2 CAAAA Arabian Sea
The last earthquake in the Mid-Indian Ridge within about 200 km of today's epicenter with M>=4.7 occurred on November 28, 2020 with M 5.4. The only other such events in the area in the past year were an M 4.9 and 5.6 on May 23, 2020.
Forecast 132519 had expected today's event was likely within about 10 km around March 31. This epicenter is at 103 degrees from the M 8.1 in the Kermadec Islands of March 4 and was probably promoted by energy from that source.
O: 31MAR2021 11:46:47 16.9S 67.0E mb=4.7 EMSC MID-INDIAN RIDGE
P: 31MAR2021 132519 17.0S 67.0E 4.0-5.4 AAAAA So. Indian Ocean
The last earthquake of M>=5.2 in the Ascension Island area with greater magnitude than today's M 5.2 was an M 5.9-6.0 on August 22, 2020. The area was active from June to August 2020, but has not seen any moderate seismicity since that time. Forecast 132324 had expected today's activity north of Ascension Island was likely around March 28. This epicenter is at 144 degrees from the quakes in Honshu, Japan and was probably promoted by energy from those sources.
O: 31MAR2021 10:09:00 6.6S 12.6W mb=5.2 EMSC ASCENSION ISLAND REGION
P: 28MAR2021 132324 5.0S 12.0W 4.0-5.6 BBAAA No. of Ascension Isl
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 31MAR2021 20:34:23 33.2N 47.2E mb=4.3 EMSC WESTERN IRAN
P: 31MAR2021 132423 33.0N 48.0E 3.8-5.4 AAAAA So. Iran
O: 31MAR2021 18:32:45 39.2N 71.5E mb=4.0 EMSC TAJIKISTAN
P: 27MAR2021 132388 38.0N 73.0E 3.8-5.6 ABBAA Hindu Kush/Pakistan
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 31MAR2021 16:13:49 0.1S 124.4E ML=4.2 EMSC MOLUCCA SEA
P: 31MAR2021 132329 1.0S 122.0E 4.0-5.4 AACAA Sulawesi area
O: 31MAR2021 16:51:05 5.7N 126.0E ML=4.5 EMSC MINDANAO, PHILIPPINES
P: 25MAR2021 132308 5.0N 127.0E 4.0-5.5 AAAAA Halmahera
P: 29MAR2021 132308 7.0N 127.0E 4.0-5.6 ABAAA Halmahera
O: 31MAR2021 12:35:30 5.8S 142.5E ML=4.8 EMSC NEW GUINEA, PAPUA NEW GUINEA
P: 22MAR2021 132325 7.0S 144.0E 4.0-5.5 CBBAA Papua New Guinea
O: 1APR2021 00:36:33 6.0S 131.6E mb=4.7 EMSC KEP. TANIMBAR REGION, INDONESI
P: 29MAR2021 132333 6.0S 131.0E 4.0-5.4 BAAAA West Irian, PNG
O: 1APR2021 05:00:51 8.7S 113.6E mb=4.4 EMSC JAVA, INDONESIA
P: 24MAR2021 132326 9.0S 111.0E 4.0-5.4 CACAA So. of Java
NEIC reported this earthquake of M 4.4 in Java, Indonesia was felt with intensity II-III in the area(s) of Bali, Indonesia at Denpasar.
O: 31MAR2021 18:57:20 8.9S 116.4E ML=4.0 EMSC LOMBOK REGION, INDONESIA
P: 28MAR2021 132330 8.0S 117.0E 4.0-5.6 BAAAA Sumbawa Island area
O: 31MAR2021 13:11:22 9.4S 112.4E ML=4.2 EMSC SOUTH OF JAVA, INDONESIA
P: 24MAR2021 132326 9.0S 111.0E 4.0-5.4 CABAA So. of Java
O: 31MAR2021 08:45:38 11.7S 118.0E ML=4.2 EMSC SOUTH OF SUMBAWA, INDONESIA
P: 26MAR2021 132522 11.0S 116.0E 4.0-5.4 BABAA So. of Indonesia
O: 01APR2021 03:02:34 12.2N 143.8E mb=4.9 EMSC GUAM REGION
O: 31MAR2021 21:19:53 12.1N 143.9E mb=5.2 EMSC GUAM REGION
P: 26MAR2021 132355 13.0N 143.0E 4.0-5.4 BAAAA So. Marianas/Guam
CENTRAL AND SOUTH AMERICA
O: 1APR2021 01:34 19.7S 69.0W mb=4.9 GUC Tarapaca at Alto Hospicio, Iqu
P: 29MAR2021 132538 20.0S 70.0W 4.0-5.4 AAAAA So. Peru/Bolivia
GUC reported this earthquake was felt with intensity III in Tarapaca at Alto Hospicio, Iquique, Pica and II in Mamina and Pozo Almonte, Chile.
O: 31MAR2021 11:20:36 3.0S 80.1W ML=4.0 EMSC PERU-ECUADOR BORDER REGION
P: 31MAR2021 132316 4.0S 80.0W 4.0-5.4 AAAAA Ecuador
O: 31MAR2021 12:04:12 8.7S 74.6W ML=4.0 EMSC CENTRAL PERU
P: 31MAR2021 132314 9.0S 75.0W 3.5-5.0 AAAAA Brazil
O: 31MAR2021 08:31:56 14.9N 93.3W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO
P: 28MAR2021 132342 14.0N 92.0W 3.5-5.3 BAAAA Guatemala
O: 31MAR2021 17:28:04 15.4N 96.7W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO
O: 31MAR2021 21:08:17 15.4N 96.7W ML=4.1 EMSC OFFSHORE OAXACA, MEXICO
O: 31MAR2021 10:55:05 15.8N 96.3W ML=4.0 EMSC OAXACA, MEXICO
O: 31MAR2021 18:15:19 15.8N 95.2W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO
P: 31MAR2021 132339 17.0N 95.0W 3.5-5.3 ABAAA Chiapas, Mexico
O: 31MAR2021 07:26:08 16.3S 72.2W mb=4.9 EMSC NEAR COAST OF SOUTHERN PERU
P: 27MAR2021 132521 16.0S 71.0W 4.0-5.8 BAAAA So. Peru/Bolivia
NEIC reported this earthquake of M 4.9 in Central Peru was felt with intensity II-III in the area(s) of Central Peru at Mollendo and Arequipa (IV).
O: 31MAR2021 19:14:35 18.4N 92.9W ML=4.1 EMSC TABASCO, MEXICO
P: 27MAR2021 132339 17.0N 94.0W 3.5-5.6 BBAAA Chiapas, Mexico
O: 1APR2021 01:34:21 19.7S 68.8W mb=4.9 EMSC TARAPACA, CHILE
P: 29MAR2021 132538 20.0S 70.0W 4.0-5.4 AAAAA So. Peru/Bolivia
NEIC reported this earthquake of M 4.9 in Iquique, Tarapaca, Chile was felt with intensity II-III in the area(s) of Iquique, Tarapaca, Chile.
O: 31MAR2021 16:09:43 36.7S 71.0W Mw=4.5 EMSC NEUQUEN, ARGENTINA
P: 27MAR2021 132542 37.0S 74.0W 4.0-5.5 BABAA Central Chile
NEIC reported this earthquake of M 4.5 in Neuquen, Argentina was felt with intensity II-III in the area(s) of Neuquen, Argentina at Los Angeles, Biobio Chile.
AFRICA AND EUROPE
O: 1APR2021 06:55:51 42.7N 16.2E ML=4.0 EMSC ADRIATIC SEA
P: 27MAR2021 132445 44.0N 16.0E 3.0-5.1 BAAAA Italy
SOUTHWEST PACIFIC
O: 31MAR2021 11:38:49 18.0S 178.0W mb=4.5 EMSC FIJI REGION
O: 31MAR2021 17:39:49 18.5S 177.5W mb=4.6 EMSC FIJI REGION
P: 27MAR2021 132525 19.0S 178.0W 4.0-5.8 BAAAA Tonga Islands
O: 31MAR2021 22:29:00 23.1S 172.2E mb=4.7 EMSC SOUTHEAST OF LOYALTY ISLANDS
P: 30MAR2021 132531 23.0S 172.0E 4.0-5.4 AAAAA Loyalty Islands
No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.
OCEAN RIDGES
O: 31MAR2021 19:16:23 14.5N 56.3E mb=5.1 EMSC OWEN FRACTURE ZONE REGION
P: 23MAR2021 132335 15.0N 56.0E 3.5-5.2 CAAAA Arabian Sea
O: 31MAR2021 11:46:47 16.9S 67.0E mb=4.7 EMSC MID-INDIAN RIDGE
P: 31MAR2021 132519 17.0S 67.0E 4.0-5.4 AAAAA So. Indian Ocean
O: 31MAR2021 10:09:00 6.6S 12.6W mb=5.2 EMSC ASCENSION ISLAND REGION
P: 28MAR2021 132324 5.0S 12.0W 4.0-5.6 BBAAA No. of Ascension Isl
ZEALANDIA AND AUSTRALIA REGION
O: 31MAR2021 23:51:11 32.1S 179.6E ML=4.3 EMSC SOUTH OF KERMADEC ISLANDS
P: 25MAR2021 132547 35.0S 179.0E 3.0-4.5 CCAAA North Island, N.Z.
O: 31MAR2021 18:57:43 35.1S 179.7E ML=3.8 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 25MAR2021 132547 35.0S 179.0E 3.0-4.5 CAAAA North Island, N.Z.
O: 31MAR2021 20:17:18 37.1S 179.3E ML=3.6 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 26MAR2021 132549 38.0S 178.0E 3.0-4.4 BAAAA North Island, N.Z.
JAPAN AND KURIL ISLANDS
O: 1APR2021 05:07:51 22.3N 144.2E mb=4.6 EMSC VOLCANO ISLANDS, JAPAN REGION
P: 27MAR2021 132371 24.0N 143.0E 4.0-5.4 BBAAA Volcano Islands
O: 1APR2021 04:30:04 41.6N 142.0E mb=4.8 EMSC HOKKAIDO, JAPAN REGION
P: 22MAR2021 132444 41.0N 142.0E 3.5-5.6 CAAAA Hokkaido, Japan
NEIC reported this earthquake of M 4.8 in Hokkaido, Japan was felt with intensity II-III in the area(s) of Hokkaido, Japan.
O: 1APR2021 03:17:51 45.6N 143.3E mb=4.1 EMSC HOKKAIDO, JAPAN REGION
P: 29MAR2021 132444 44.0N 142.0E 3.5-5.6 ABAAA Hokkaido, Japan
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 31MAR2021 09:34:50 32.4N 115.2W Ml=2.2 EMSC BAJA CALIFORNIA, MEXICO
O: 31MAR2021 09:38:54 32.4N 115.3W ML=2.7 EMSC BAJA CALIFORNIA, MEXICO
O: 31MAR2021 17:53:32 32.4N 115.2W Ml=2.5 EMSC BAJA CALIFORNIA, MEXICO
O: 31MAR2021 18:42:18 32.4N 115.2W Ml=3.0 EMSC BAJA CALIFORNIA, MEXICO
O: 31MAR2021 07:38:18 33.2N 115.7W Ml=2.3 EMSC SOUTHERN CALIFORNIA
O: 31MAR2021 08:56:24 32.3N 115.3W mb=4.3 EMSC BAJA CALIFORNIA, MEXICO
P: 29MAR2021 132410 32.4N 115.8W 2.5-4.5 AAAAA So. California
O: 31MAR2021 23:56:35 36.0N 119.9W Md=2.3 EMSC CENTRAL CALIFORNIA
P: 28MAR2021 132381 36.1N 120.1W 2.5-4.9 BAAAA Central California
O: 01APR2021 01:58:05 36.8N 121.5W Md=2.1 EMSC CENTRAL CALIFORNIA
O: 31MAR2021 13:44:03 36.8N 121.5W Ml=3.3 EMSC CENTRAL CALIFORNIA
O: 1APR2021 01:14:41 36.8N 121.5W Md=2.5 EMSC CENTRAL CALIFORNIA
P: 29MAR2021 132382 36.4N 121.0W 2.5-4.7 BAAAA Central California
NEIC reported this earthquake of M 2.5 in Marina California was felt with intensity II-III in the area(s) of Marina California. The M 3.3 was felt with intensity II-III in Sna Juan Bautista, Salinas, Aromas, Castroville, Gilroy and Hollister.
O: 31MAR2021 22:34:13 37.0N 118.5W Md=2.3 EMSC CENTRAL CALIFORNIA
P: 28MAR2021 132377 37.8N 118.2W 2.5-4.8 BAAAA California/Nevada area
O: 31MAR2021 15:58:02 38.2N 118.1W ml=2.1 EMSC NEVADA
O: 31MAR2021 15:58:02 38.2N 118.1W ml=2.1 EMSC NEVADA
O: 31MAR2021 18:30:49 38.2N 117.9W ML=2.2 EMSC NEVADA
O: 31MAR2021 19:44:10 38.2N 118.1W ml=2.2 EMSC NEVADA
O: 31MAR2021 20:24:26 38.2N 117.9W ML=3.2 EMSC NEVADA
O: 31MAR2021 12:04:08 38.2N 117.9W ml=2.0 EMSC NEVADA
P: 28MAR2021 132377 37.8N 118.2W 2.5-4.8 BAAAA California/Nevada area
O: 1APR2021 01:09:16 39.8N 120.7W Md=2.3 EMSC NORTHERN CALIFORNIA
P: 28MAR2021 132458 40.6N 121.4W 2.5-4.6 BAAAA Northern California
O: 1APR2021 06:03:38 40.5N 122.0W ML=2.8 EMSC NORTHERN CALIFORNIA
P: 26MAR2021 132458 40.4N 122.2W 2.5-4.6 CAAAA Northern California
O: 31MAR2021 21:14:07 40.5N 124.2W Md=2.2 EMSC NORTHERN CALIFORNIA
O: 31MAR2021 12:14:47 41.3N 123.9W Ml=2.9 EMSC NORTHERN CALIFORNIA
P: 28MAR2021 132460 40.2N 124.2W 2.5-4.4 BBAAA Off Coast of No. Calif
NEIC reported this earthquake of M 3.0 in Northern California was felt with intensity II-III in the area(s) of Northern California in Millville, Palo Cedro, Shingletown, Anderson, Redding, Whitmore, Shasta Lake and Cottonwood.
The M 2.9 further to the west was felt with intensity II in Crescent City, California.
ALASKA
No events of M>=3 were located in Alaska today.
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 31MAR2021 21:17:05 44.1N 120.8W Ml=2.3 EMSC OREGON
P: 26MAR2021 132464 45.3N 121.7W 2.0-4.0 BBAAA Oregon state, U.S.
O: 31MAR2021 15:47:35 48.9N 122.2W ML=2.2 EMSC WASHINGTON
P: 23MAR2021 132473 48.0N 123.0W 2.0-4.1 CAAAA Washington state, U.S.
ROCKY MOUNTAINS REGION
O: 31MAR2021 19:30:00 31.7N 104.4W ML=2.5 EMSC WESTERN TEXAS
O: 31MAR2021 14:15:24 31.7N 104.4W ML=3.0 EMSC WESTERN TEXAS
P: 25MAR2021 132409 32.2N 104.1W 2.0-4.1 CAAAA SW U.S.A
O: 31MAR2021 11:56:08 44.5N 115.2W Ml=2.2 EMSC SOUTHERN IDAHO
O: 31MAR2021 09:21:24 44.5N 115.2W Ml=2.5 EMSC SOUTHERN IDAHO
P: 27MAR2021 132451 44.5N 114.7W 2.0-4.3 BAAAA Montana/Idaho
EASTERN U.S./CANADA
O: 01APR2021 02:19:35 29.1N 97.6W mb=2.5 EMSC SOUTHERN TEXAS
O: 31MAR2021 04:20:06 45.7N 73.0W MB=2.1 ECAN Saint-Hyacinthe, QC
P: 27MAR2021 132455 44.0N 73.0W 2.0-4.1 BBAAA New England
O: 30MAR2021 22:46:06 47.7N 69.8W MB=1.4 ECAN Charlevoix Seismic Zone
P: 30MAR2021 132455 47.3N 70.5W 2.0-3.9 AAAAA New England
HAWAII
No earthquakes of M>=3 were located in Hawaii.
ENHANCED SEISMICITY RELATED TO FULL MOON TIDES
EARTHQUAKE SUMMARY FOR MARCH 30, 2021
The strongest activity in the world today occurred near the longitudes of maximum tidal stress with the full moon as previously defined in this summary:
"The full moon arrived on March 28, 2021 at 18:48 UT. Longitudes which were at sub-solar conditions at this time area near 102 West and anti-solar (local solar midnight) at 78 East longitude. These include in the West regions of the Rocky Mountains and western North America and in the east Afghanistan, Tajikistan, Xinjiang, China and Central Asia. These areas may see enhanced seismicity due to tidal effects over the next week. Seismicity may shift to times closer to local solar noon and midnight during this period, and a moderately large earthquake is possible at this time due to tidal triggering." (March 25-30, 2021)
The strongest earthquake in the world today occurred at 105 West longitude in the southern East Pacific Rise near the longitude of maximum tidal stress with this full moon. It occurred near local solar noon and was probably promoted by enhanced tidal stresses which maximize near this hour. The last earthquake of M>=5.8 in this region of the east Pacific was an M 5.8 on September 27, 2019 and before that an M 5.8 on March 17, 2012. The last of significantly larger magnitude in this region was an M 6.5 on June 10, 1997. Forecast 132543 had expected regional seismic enhancement around March 31.
O: 30MAR2021 21:35:48 35.4S 106.0W Mw=5.8 EMSC SOUTHERN EAST PACIFIC RISE
P: 31MAR2021 132543 36.0S 97.0W 4.0-5.4 ACAAA Chile Rise
A moderately strong quake of M 5.7-5.8 also occurred in Western Xizang, China.
CENC reported this was lightly felt in the epicentral area and was M 5.8. At 87 East longitude this is near the longitude of highest tidal stress with this full moon (see above). An M 6.3 hit about 150 km southwest of this on July 22, 2020 and an M 7.5 occurred on November 8, 1997. The last of closer location of M>=5.7 was an M 5.7-5.9 on March 5, 2001. Forecast 132435 had expected regional enhanced seismicity in Xizang south of this around March 29. Note also that this epicenter is nearly antipodal the the M 5.8 today in the Southern East Pacific Rise.
O: 29MAR2021 17:27:26 34.3N 87.7E Mw=5.7 EMSC WESTERN XIZANG
O: 29MAR2021 17:27:24 34.4N 87.7E Mw=5.8 CENC WESTERN XIZANG
P: 29MAR2021 132435 31.0N 88.0E 3.8-5.3 ACAAA Xizang
Seismicity was also enhanced in the western U.S. today where a series of light earthquakes in Utah were joined by an M 4.7 off Northern California and an M 4.4 in eastern Nevada near Mina. The strongest earthquake in the U.S. or Canada today was an M 4.7 off the coast of northern California. NEIC reported it was lightly felt in California at Eureka, McKinleyville. This is the strongest earthquake off the coast of Northern California since an M 4.8 more than a year ago on March 22, 2020 - an aftershocks of an M 5.8 on March 9, 2020. Forecast 132459 had expected today's event within about 25 km of this epicenter was likely around March 28.
O: 30MAR2021 15:51:15 40.3N 125.6W Mw=4.7 EMSC OFFSHORE NORTHERN CALIFORNIA
P: 28MAR2021 132459 40.5N 125.8W 2.5-4.4 AAAAA Off Coast of No. Calif
An M 4.4 also occurred in the region of Mina, Nevada. It occurred about 15 minutes after the M 4.7 off northern California and may have been triggered by energy from that event. NEIC reported this earthquake was felt with intensity II-III in the area(s) of Nevada at Luning, Silverpeak, Fallon. The mainshock in this series was an M 6.5 on May 15, 2020. Today's event is the strongest aftershock in this region in the year 2021. The last of larger magnitude in the area was an M 4.7 on December 14, 2020. Forecast 132377 had expected today's activity was likely within the aftershock area around March 28.
O: 30MAR2021 16:04:05 38.2N 118.1W ML=4.3 EMSC NEVADA
O: 30MAR2021 16:04:05 38.2N 118.1W ML=4.4 ANSS NEVADA
P: 28MAR2021 132377 37.8N 118.2W 2.5-4.8 BAAAA California/Nevada area
Seismicity in Europe was also at elevated levels today. The strongest event in the region was an M 4.7 in the Adriatic Sea followed by an unusual M 4.2 in Austria. The M 4.7 is the largest aftershock to date of the event in the Adriatic Sea of M 5.5 on March 27, 2021 - the strongest in this area since an M 4.7 on December 29, 2013. An M 3.5 also occurred about 100 km southwest of the M 4.7 about 9 minutes later. The only events near this M 3.5 in the past four years was an M 4.4 on April 18, 2020 and an M 4.5 on December 6, 2015. Today's event is probably a regional aftershock of the M 5.5 on March 27, 2021 to the north.
NEIC reported this earthquake of M 4.7 in the Adriatic Sea was felt with intensity II-III in the area(s) of Split, Croatia and possibly in Prague, Czech Republic.
O: 30MAR2021 07:44:39 42.3N 15.7E ML=3.5 EMSC ADRIATIC SEA
O: 30MAR2021 07:35:43 42.6N 16.1E mb=4.7 EMSC ADRIATIC SEA
P: 27MAR2021 132445 44.0N 16.0E 3.0-5.1 BBAAA Italy
P: 28MAR2021 132437 42.0N 19.0E 3.0-5.1 AABAA Adriatic Sea
An unusual earthquake of M 4.2 shook regions of Austria today. NEIC reported this event with maximum intensity in Rust, Burgenland, Austria and IV in Neudorfi, Gloggnitz and III in Wiener, Berndorf, Bad Voslau, Traiskirchen, Sopron, Weiner and Modilng. This is the strongest earthquake in Austria within about 150 km of this epicenter since an M 4.2 on May 7, 2009. The last of larger magnitude in the region was an M 4.4 on October 1, 2004. Forecast 132437 had expected regional activity would be enhanced following the M 5.5 in the Adriatic Sea of March 27.
O: 30MAR2021 16:25:00 47.8N 16.2E mb=4.2 EMSC AUSTRIA
P: 25MAR2021 132437 45.0N 16.0E 3.0-4.9 BCAAA Adriatic Sea
A series of events of M 5.0, 5.0 and 5.2 occurred today in the Scotia Sea in the South Atlantic. This is a remote epicenter and these events were not reported felt. The last earthquake in the Scotia Sea within about 300 km of these epicenters was an M 5.3 on October 18, 2016. These events are probably aftershocks of the M 7.8 and M 6.8 on November 15 and 17, 2013. Forecast 132561 had expected enhanced seismicity in this area was likely at the end of March.
O: 31MAR2021 06:53:33 60.2S 47.1W mb=5.2 EMSC SCOTIA SEA
O: 31MAR2021 06:52:03 60.3S 47.2W mb=5.0 EMSC SCOTIA SEA
O: 31MAR2021 06:52:03 60.3S 47.2W mb=5.0 EMSC SCOTIA SEA
P: 25MAR2021 132561 60.0S 38.0W 3.0-5.6 BACAA So. So. America
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 31MAR2021 01:43:38 42.3N 71.0E mb=4.5 EMSC KYRGYZSTAN
P: 31MAR2021 132447 40.0N 75.0E 4.0-5.6 ACCAA Kirgizstan/Xinjiang
O: 31MAR2021 00:01:26 51.2N 100.3E Mw=5.2 EMSC RUSSIA-MONGOLIA BORDER REGION
P: 28MAR2021 132493 51.0N 98.0E 3.0-4.4 BABAA So. Siberia
INDONESIA AND PHILIPPINES
O: 31MAR2021 01:16:30 1.3N 127.2E ML=4.4 EMSC HALMAHERA, INDONESIA
P: 28MAR2021 132307 2.0N 127.0E 4.0-5.6 BAAAA Halmahera
O: 30MAR2021 11:51:22 2.0S 127.3E ML=4.0 EMSC KEPULAUAN OBI, INDONESIA
O: 30MAR2021 11:30:24 2.0S 127.4E ML=4.3 EMSC KEPULAUAN OBI, INDONESIA
P: 31MAR2021 132315 1.0S 127.0E 4.0-5.4 AAAAA Ceram area
O: 30MAR2021 20:44:23 6.4S 130.0E mb=4.5 EMSC BANDA SEA
P: 29MAR2021 132333 6.0S 131.0E 4.0-5.4 AAAAA West Irian, PNG
O: 30MAR2021 16:56:42 12.9N 121.0E ML=4.0 EMSC MINDORO, PHILIPPINES
P: 28MAR2021 132345 12.0N 124.0E 3.5-5.2 AACAA Luzon, Philippines
CENTRAL AND SOUTH AMERICA
O: 31MAR2021 01:17:23 6.9N 73.0W mb=4.2 EMSC NORTHERN COLOMBIA
P: 31MAR2021 132312 9.0N 70.0W 4.0-5.6 ACCAA Venezuela
O: 30MAR2021 19:34:30 9.9N 86.2W ML=4.4 EMSC OFF COAST OF COSTA RICA
P: 28MAR2021 132350 11.0N 87.0W 3.5-5.2 ABAAA Nicaragua
O: 30MAR2021 09:17:18 10.6S 78.8W ML=4.8 EMSC NEAR COAST OF CENTRAL PERU
P: 28MAR2021 132323 8.0S 78.0W 4.0-5.6 ACAAA No. Peru
O: 31MAR2021 04:41:20 14.0N 93.0W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO
P: 28MAR2021 132342 14.0N 92.0W 3.5-5.3 BAAAA Guatemala
O: 30MAR2021 07:58:15 15.2N 94.7W ML=4.3 EMSC OFF COAST OF OAXACA, MEXICO
O: 31MAR2021 03:57:39 15.5N 95.0W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO
O: 30MAR2021 11:20:36 16.5N 95.7W ML=4.4 EMSC OAXACA, MEXICO
P: 31MAR2021 132339 17.0N 95.0W 3.5-5.3 AAAAA Chiapas, Mexico
O: 30MAR2021 16:45:36 17.6N 97.5W ML=4.0 EMSC OAXACA, MEXICO
P: 30MAR2021 132353 17.0N 98.0W 3.5-5.3 AAAAA Oaxaca, Mexico
O: 31MAR2021 01:43:17 19.1N 69.1W mb=4.1 EMSC DOMINICAN REPUBLIC REGION
O: 31MAR2021 01:06:23 19.1N 69.0W ML=3.2 EMSC DOMINICAN REPUBLIC REGION
P: 26MAR2021 132354 19.0N 71.0W 3.4-5.3 BABAA Puerto Rico
NEIC reported this earthquake of M 4.1 in the Dominican Republic was felt with intensity II-III in the area(s) of the Dominican Republic with IV in Miches El Seibo and Samana (III).
O: 31MAR2021 06:50:28 20.6S 67.1W mb=4.6 EMSC POTOSI, BOLIVIA
P: 29MAR2021 132538 20.0S 70.0W 4.0-5.4 AACAA So. Peru/Bolivia
O: 30MAR2021 21:34:52 28.1S 68.1W mb=4.4 EMSC LA RIOJA, ARGENTINA
P: 26MAR2021 132529 28.0S 68.0W 4.0-5.4 BAAAA Argentina
AFRICA AND EUROPE
O: 30MAR2021 07:44:39 42.3N 15.7E ML=3.5 EMSC ADRIATIC SEA
O: 30MAR2021 07:35:43 42.6N 16.1E mb=4.7 EMSC ADRIATIC SEA
P: 27MAR2021 132445 44.0N 16.0E 3.0-5.1 BBAAA Italy
P: 28MAR2021 132437 42.0N 19.0E 3.0-5.1 AABAA Adriatic Sea
O: 30MAR2021 16:25:00 47.8N 16.2E mb=4.2 EMSC AUSTRIA
P: 25MAR2021 132437 45.0N 16.0E 3.0-4.9 BCAAA Adriatic Sea
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 31MAR2021 03:59:15 20.8S 169.9E mb=4.8 EMSC VANUATU
P: 23MAR2021 132527 19.0S 169.0E 4.0-5.5 CAAAA Vanuatu Islands
O: 30MAR2021 14:06:41 23.3S 172.1E mb=4.6 EMSC SOUTHEAST OF LOYALTY ISLANDS
P: 30MAR2021 132531 23.0S 172.0E 4.0-5.4 AAAAA Loyalty Islands
No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.
OCEAN RIDGES
O: 30MAR2021 13:14:11 16.5N 48.8W mb=4.8 EMSC NORTH ATLANTIC OCEAN
P: 27MAR2021 132349 17.0N 47.0W 4.0-5.6 BABAA Mid-Atlantic Ridge
O: 30MAR2021 21:35:48 35.4S 106.0W Mw=5.8 EMSC SOUTHERN EAST PACIFIC RISE
P: 31MAR2021 132543 36.0S 97.0W 4.0-5.4 ACAAA Chile Rise
O: 30MAR2021 09:24:18 53.8S 140.4E mb=4.9 EMSC WEST OF MACQUARIE ISLAND
O: 31MAR2021 06:53:33 60.2S 47.1W mb=5.2 EMSC SCOTIA SEA
O: 31MAR2021 06:52:03 60.3S 47.2W mb=5.0 EMSC SCOTIA SEA
O: 31MAR2021 06:52:03 60.3S 47.2W mb=5.0 EMSC SCOTIA SEA
P: 25MAR2021 132561 60.0S 38.0W 3.0-5.6 BACAA So. So. America
ZEALANDIA AND AUSTRALIA REGION
O: 30MAR2021 09:24:18 53.8S 140.4E mb=4.9 EMSC WEST OF MACQUARIE ISLAND
O: 31MAR2021 04:05:57 29.2S 176.3W mb=5.1 EMSC KERMADEC ISLANDS REGION
P: 29MAR2021 132533 29.0S 177.0W 4.0-5.4 AAAAA No. Kermadec Islands
O: 30MAR2021 08:35:05 35.8S 178.2E ML=3.6 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 25MAR2021 132547 35.0S 179.0E 3.0-4.5 BAAAA North Island, N.Z.
O: 30MAR2021 10:02:12 37.6S 179.7E ML=3.6 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 27MAR2021 132548 37.0S 178.0E 3.0-4.9 AABAA North Island, N.Z.
JAPAN AND KURIL ISLANDS
O: 30MAR2021 18:08:30 35.0N 138.5E ML=4.0 EMSC EASTERN HONSHU, JAPAN
P: 29MAR2021 132385 34.0N 135.0E 3.5-4.9 AACAA Central/So. Honshu Japan
O: 30MAR2021 11:11:09 36.2N 142.0E mb=4.8 EMSC NEAR EAST COAST OF HONSHU, JAP
P: 28MAR2021 132404 36.0N 141.0E 4.0-5.4 AAAAA Off East Coast Honshu
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 30MAR2021 16:04:05 38.2N 118.1W ML=4.3 EMSC NEVADA
O: 30MAR2021 16:07:50 38.2N 118.1W ml=2.1 EMSC NEVADA
O: 30MAR2021 16:12:31 38.2N 118.1W ml=2.0 EMSC NEVADA
O: 30MAR2021 16:52:55 38.2N 118.1W ml=2.2 EMSC NEVADA
O: 30MAR2021 17:16:27 38.2N 118.1W ml=2.1 EMSC NEVADA
O: 30MAR2021 18:08:18 38.2N 117.8W ml=2.0 EMSC NEVADA
O: 30MAR2021 18:35:52 38.2N 118.1W ML=2.7 EMSC NEVADA
O: 30MAR2021 22:19:55 38.2N 118.1W ml=2.4 EMSC NEVADA
O: 30MAR2021 23:06:52 38.2N 118.1W ML=2.5 EMSC NEVADA
O: 30MAR2021 16:21:59 38.3N 118.2W ML=2.4 EMSC NEVADA
O: 31MAR2021 05:04:55 38.1N 117.9W ml=2.0 EMSC NEVADA
P: 28MAR2021 132377 37.8N 118.2W 2.5-4.8 BAAAA California/Nevada area
O: 30MAR2021 22:30:36 33.0N 116.4W Ml=2.0 EMSC SOUTHERN CALIFORNIA
P: 29MAR2021 132412 32.8N 116.0W 2.5-4.4 AAAAA So. California
O: 31MAR2021 04:11:36 35.4N 118.4W Ml=2.2 EMSC CENTRAL CALIFORNIA
P: 26MAR2021 132419 35.0N 119.2W 2.5-5.0 BAAAA So. California
O: 31MAR2021 03:39:09 35.7N 117.6W Ml=2.4 EMSC SOUTHERN CALIFORNIA
P: 29MAR2021 132375 36.3N 118.1W 2.5-4.8 AAAAA California/Nevada area
O: 30MAR2021 23:33:52 36.0N 120.9W Md=2.6 EMSC CENTRAL CALIFORNIA
O: 30MAR2021 10:08:37 36.0N 121.5W Md=2.0 EMSC OFFSHORE CENTRAL CALIFORNIA
P: 29MAR2021 132382 36.4N 121.0W 2.5-4.7 AAAAA Central California
O: 30MAR2021 11:56:55 36.1N 117.8W Ml=2.2 EMSC CENTRAL CALIFORNIA
P: 29MAR2021 132375 36.3N 118.1W 2.5-4.8 AAAAA California/Nevada area
O: 30MAR2021 16:04:29 36.8N 117.9W ML=3.2 EMSC CENTRAL CALIFORNIA
P: 29MAR2021 132375 36.3N 118.1W 2.5-4.8 AAAAA California/Nevada area
O: 31MAR2021 00:43:27 36.9N 121.3W Md=2.2 EMSC CENTRAL CALIFORNIA
P: 29MAR2021 132382 36.4N 121.0W 2.5-4.7 AAAAA Central California
O: 30MAR2021 07:14:22 37.1N 115.3W ml=2.4 EMSC NEVADA
P: 29MAR2021 132379 38.7N 115.4W 2.5-4.4 ABAAA California/Nevada area
O: 30MAR2021 22:34:36 37.4N 116.2W ml=2.0 EMSC NEVADA
P: 26MAR2021 132421 35.5N 116.4W 2.5-4.5 BBAAA So. California
O: 31MAR2021 05:04:55 38.1N 117.9W ml=2.0 EMSC NEVADA
P: 28MAR2021 132377 37.8N 118.2W 2.5-4.8 BAAAA California/Nevada area
O: 30MAR2021 17:05:34 38.8N 122.8W ML=2.9 EMSC NORTHERN CALIFORNIA
P: 31MAR2021 132383 38.7N 122.7W 2.5-4.5 AAAAA Central California
NEIC reported this earthquake of M 3.1 in the Geysers, Northern California was felt with intensity II-III in the area(s) of the Geysers, Northern California at Kelseyville, Geyserville, Middletown, Hopland, Windsor.
O: 30MAR2021 15:51:15 40.3N 125.6W Mw=4.7 EMSC OFFSHORE NORTHERN CALIFORNIA
P: 28MAR2021 132459 40.5N 125.8W 2.5-4.4 AAAAA Off Coast of No. Calif
ALASKA
O: 30MAR2021 12:49:21 51.2N 175.0W ml=3.6 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
P: 29MAR2021 132479 51.9N 176.0W 3.5-5.3 AAAAA Andreanoff Isls, Aleutians
O: 31MAR2021 01:16:55 55.5N 158.1W mb=4.2 EMSC ALASKA PENINSULA
P: 29MAR2021 132477 54.7N 156.9W 3.5-5.3 AAAAA Alaska Peninsula
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 30MAR2021 16:47:57 50.6N 130.6W MB=3.8 ECAN Port Hardy, BC
P: 27MAR2021 132482 50.5N 130.4W 3.0-5.0 BAAAA British Colombia
O: 30MAR2021 18:06:53 47.8N 122.5W ML=2.6 EMSC SEATTLE-TACOMA AREA, WASHINGTON
O: 30MAR2021 07:24:12 47.6N 122.6W Ml=2.3 EMSC SEATTLE-TACOMA AREA, WASHINGTO
P: 26MAR2021 132473 47.5N 121.8W 2.0-4.0 BAAAA Washington state, U.S.
ROCKY MOUNTAINS REGION
O: 30MAR2021 14:59:40 38.4N 113.1W Md=2.1 EMSC UTAH
O: 30MAR2021 19:19:54 38.3N 113.1W Ml=2.1 EMSC UTAH
P: 29MAR2021 132432 38.7N 112.6W 2.0-3.9 AAAAA Utah area
O: 30MAR2021 15:16:45 39.4N 110.3W MD=2.1 EMSC UTAH
P: 27MAR2021 132433 39.7N 110.8W 2.0-3.9 BAAAA Utah area
O: 30MAR2021 16:32:47 37.3N 112.6W ML=2.8 EMSC UTAH
P: 29MAR2021 132432 38.7N 112.6W 2.0-3.9 ABAAA Utah area
O: 30MAR2021 20:07:55 41.6N 112.3W Ml=2.2 EMSC UTAH
P: 31MAR2021 132474 43.2N 111.0W 2.0-4.1 ABAAA Yellowstone/Wyoming
EASTERN U.S./CANADA
O: 31MAR2021 04:20:06 45.7N 73.0W MB=2.1 ECAN Saint-Hyacinthe, QC
P: 27MAR2021 132455 44.0N 73.0W 2.0-4.1 BBAAA New England
O: 30MAR2021 22:46:06 47.7N 69.8W MB=1.4 ECAN Charlevoix Seismic Zone
P: 30MAR2021 132455 47.3N 70.5W 2.0-3.9 AAAAA New England
O: 30MAR2021 14:33:07 50.3N 66.2W MB=2.5 ECAN Sept-Iles, QC. Felt
P: 31MAR2021 132442 49.0N 66.0W 2.0-3.9 ABAAA E. of Maine
O: 30MAR2021 10:17:13 57.0N 89.5W MB=2.2 ECAN Fort Severn, ON
P: 31MAR2021 132505 64.0N 87.0W 2.5-4.2 ACBAA Nunavit/Hudson Bay, Canada
O: 30MAR2021 13:17:55 34.4N 97.6W ML=2.0 EMSC OKLAHOMA
P: 27MAR2021 132426 35.0N 96.0W 2.0-4.1 BAAAA Southern Plains
HAWAII
O: 30MAR2021 16:09:29 19.6N 155.5W ML=3.6 EMSC ISLAND OF HAWAII, HAWAII
P: 25MAR2021 132360 19.4N 155.1W 4.0-5.5 BAAAA Hawaii area
NEIC reported this earthquake of M 3.3 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Paauilo, Holualoa, Pepeekeo, Kamuela, Kailua Kona, Captain Cook, Honokaa, Waikoloa.
MODERATE QUAKE IN BEAUFORT SEA LARGEST IN EXACTLY 34 YEARS
EARTHQUAKE SUMMARY FOR MARCH 29, 2021
The strongest earthquake in the U.S. or Canada today was an M 5.1-5.3 in the Beaufort Sea in the Yukon and Nunavut, Canada. It was not reported felt in this remote area. This is the strongest earthquake in the Beaufort Sea within about 300 km of this epicenter in at least 30 years. The largest earthquake previously recorded in this area was an M 6.5 on November 16, 1920. Other earthquakes in the area of M>5.1 hit the area on July 5, 1937 (M 5.5); and March 30, 1987 (M 5.2-5.5) exactly 34 years ago today. An M 5.1 also hit the area on June 14, 1975. Forecast 132511 had expected today's event within about 150 km of today's epicenter was likely around March 30. This epicenter is near the north Geomagnetic Pole and may have been promoted by the recent strong geomagnetic storm, the largest since September, 2020 as noted in previous issues of this summary:
"This concludes the strongest geomagnetic storm since AP reached 32 on September 28, 2020. Geomagnetic storms such as this can help promote elevated seismicity near the geomagnetic equator and at high latitudes" (March 25, 2021)
This epicenter is near 106 degrees from the M 8.1 in the Kermadec Islands of March 4 and at 103 degrees from the Loyalty Islands activity of February 10, 2021 may have been promoted by energy from those sources. It is also at the seventh node (52 degrees) from Honshu Japan.
O: 30MAR2021 00:06:12 72.2N 133.1W MB=5.3 ECAN Baillie, NT
O: 30MAR2021 00:06:08 72.3N 133.3W Mw=5.1 EMSC BEAUFORT SEA
P: 30MAR2021 132511 71.0N 134.0W 2.5-4.0 ABAAA Yukon Territory, Canada
An unusual earthquake of M 3.0 also occurred in Quebec in the Ngava, Inukjuak area. The last earthquake of larger magnitude than M 3.0 within about 300 km of this epicenter was an M 3.9 nearly 14 years ago on September 2, 2007. Forecasts 132490 and 132497 had expected this activity within about 100 km was likely between March 27 and 31.
O: 29MAR2021 16:08:12 58.9N 78.0W ML=3.0 EMSC NGAVA PENINSULA, QUEBEC, CANAD
O: 29MAR2021 16:08:12 58.9N 77.9W MB=3.0 ECAN Inukjuak, QC
P: 27MAR2021 132490 59.0N 76.0W 2.0-4.1 AAAAA Quebec, Canada
P: 31MAR2021 132497 60.0N 79.0W 2.5-4.3 ABAAA Baffin/Davis Strait Canada
The strongest earthquake in the world today was an M 5.7-5.8 in Western Xizang, China. CENC reported this was lightly felt in the epicentral area and was M 5.8.
An M 6.3 hit about 150 km southwest of this on July 22, 2020 and an M 7.5 occurred on November 8, 1997. The last of closer location of M>=5.7 was an M 5.7-5.9 on March 5, 2001. Forecast 132435 had expected regional enhanced seismicity in Xizang south of this around March 29. This event which occurred within about 30 minutes of local solar midnight may have been promoted by high tidal stresses associated with the full moon. The tidal forecast in this summary had expected activity near this longitude as:
“The full moon arrived on March 28, 2021 at 18:48 UT. Longitudes which were at sub-solar conditions at this time area near 102 West and anti-solar (local solar midnight) at 78 East longitude. These include in the West regions of the Rocky Mountains and western North America and in the east Afghanistan, Tajikistan, Xinjiang, China and Central Asia. These areas may see enhanced seismicity due to tidal effects over the next week. Seismicity may shift to times closer to local solar noon and midnight during this period, and a moderately large earthquake is possible at this time due to tidal triggering.” (March 27-30, 2021)
O: 29MAR2021 17:27:26 34.3N 87.7E Mw=5.7 EMSC WESTERN XIZANG
O: 29MAR2021 17:27:24 34.4N 87.7E Mw=5.8 CENC WESTERN XIZANG
P: 29MAR2021 132435 31.0N 88.0E 3.8-5.3 ACAAA Xizang
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 29MAR2021 10:45:16 26.2N 95.5E ML=3.9 EMSC MYANMAR-INDIA BORDER REGION
P: 27MAR2021 132363 25.0N 95.0E 4.0-5.4 ABAAA Myanmar
O: 29MAR2021 18:49:02 28.0N 87.6E ML=3.6 EMSC NEPAL
P: 22MAR2021 132365 27.0N 88.0E 3.5-5.4 CAAAA Nepal
O: 29MAR2021 17:27:26 34.3N 87.7E Mw=5.7 EMSC WESTERN XIZANG
O: 29MAR2021 17:27:24 34.4N 87.7E Mw=5.8 CENC WESTERN XIZANG
P: 29MAR2021 132435 31.0N 88.0E 3.8-5.3 ACAAA Xizang
O: 30MAR2021 05:04:37 46.4N 142.1E mb=4.1 EMSC SAKHALIN, RUSSIA
P: 29MAR2021 132444 44.0N 142.0E 3.5-5.6 ACAAA Hokkaido, Japan
O: 29MAR2021 19:41:51 54.8N 162.8E mb=4.7 EMSC NEAR EAST COAST OF KAMCHATKA
P: 26MAR2021 132484 54.0N 161.0E 4.0-5.6 BAAAA E. of Kamchatka
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 29MAR2021 09:59:14 4.6S 138.6E ML=4.3 EMSC PAPUA, INDONESIA
P: 26MAR2021 132332 3.0S 139.0E 4.0-5.6 BBAAA West Irian, PNG
O: 29MAR2021 20:31:53 5.5S 141.4E ML=4.7 EMSC NEW GUINEA, PAPUA NEW GUINEA
P: 26MAR2021 132332 3.0S 139.0E 4.0-5.6 BCCAA West Irian, PNG
O: 30MAR2021 04:32:51 7.5S 128.3E mb=4.5 EMSC KEPULAUAN BARAT DAYA, INDONESI
P: 30MAR2021 132313 7.0S 129.0E 4.0-5.4 AAAAA Banda Sea
O: 29MAR2021 21:08:36 13.6N 125.2E ML=4.1 EMSC PHILIPPINE ISLANDS REGION
P: 28MAR2021 132345 12.0N 124.0E 3.5-5.2 ABAAA Luzon, Philippines
O: 29MAR2021 19:42:54 21.3N 146.0E Mw=5.2 EMSC MARIANA ISLANDS REGION
O: 29MAR2021 19:45:33 21.4N 145.9E mb=5.1 EMSC MARIANA ISLANDS REGION
O: 29MAR2021 19:15:44 21.3N 146.2E mb=4.9 EMSC MARIANA ISLANDS REGION
P: 24MAR2021 132371 21.0N 147.0E 4.0-5.6 BAAAA Volcano Islands
CENTRAL AND SOUTH AMERICA
O: 30MAR2021 06:12:44 7.6S 76.3W ML=4.1 EMSC NORTHERN PERU
P: 28MAR2021 132323 6.0S 76.0W 4.0-5.4 ABAAA No. Peru
P: 28MAR2021 132323 8.0S 78.0W 4.0-5.6 AABAA No. Peru
O: 29MAR2021 22:16:01 8.4N 82.9W mb=4.5 EMSC PANAMA-COSTA RICA BORDER REGION
P: 27MAR2021 132304 9.0N 84.0W 3.5-5.4 AAAAA Costa Rica
NEIC reported this earthquake of M 4.5 in Panama/Costa Rica was felt with intensity II-III in the area(s) of Costa Rica at San Vito Puntarenas.
O: 29MAR2021 20:46:33 10.2N 86.0W mb=4.8 EMSC COSTA RICA
P: 28MAR2021 132350 11.0N 87.0W 3.5-5.2 AAAAA Nicaragua
NEIC reported this earthquake of M 4.8 in Costa Rica was felt with intensity II-III in the area(s) of Costa Rica with IV in Belen and Bagaces, Guanacaste and in Santa Cruz, Sardina, Samara.
O: 30MAR2021 00:58:28 14.8N 93.1W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
O: 29MAR2021 08:05:19 15.1N 93.8W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
P: 28MAR2021 132342 14.0N 92.0W 3.5-5.3 AAAAA Guatemala
O: 29MAR2021 14:38:22 15.3N 91.8W mb=4.4 EMSC GUATEMALA
P: 28MAR2021 132342 14.0N 92.0W 3.5-5.3 ABAAA Guatemala
O: 29MAR2021 10:49:49 15.8N 96.1W ML=4.0 EMSC OAXACA, MEXICO
P: 30MAR2021 132353 15.0N 97.0W 3.5-5.1 AAAAA Oaxaca, Mexico
O: 29MAR2021 13:42:58 16.1N 91.3W ML=4.1 EMSC CHIAPAS, MEXICO
P: 30MAR2021 132342 14.0N 91.0W 3.5-5.3 ACAAA Guatemala
O: 29MAR2021 07:06:01 17.5N 94.8W ML=4.1 EMSC VERACRUZ, MEXICO
P: 31MAR2021 132339 17.0N 95.0W 3.5-5.3 AAAAA Chiapas, Mexico
O: 30MAR2021 06:23:13 18.0N 65.5W Md=3.2 EMSC PUERTO RICO REGION
O: 30MAR2021 01:07:21 18.0N 65.4W ML=3.9 EMSC PUERTO RICO REGION
P: 28MAR2021 132356 20.0N 65.0W 3.0-4.6 ABAAA Bahamas/No. Caribbean
O: 29MAR2021 12:43:54 18.1N 71.5W ML=3.0 EMSC DOMINICAN REPUBLIC
P: 26MAR2021 132354 19.0N 71.0W 3.4-5.3 BAAAA Puerto Rico
O: 29MAR2021 18:38:18 28.4N 105.2W mb=4.0 EMSC CHIHUAHUA, MEXICO
O: 29MAR2021 19:40:03 28.0N 112.2W ML=3.9 EMSC GULF OF CALIFORNIA
P: 31MAR2021 132359 28.0N 112.0W 3.5-5.1 AAAAA Gulf of California
NEIC reported this earthquake of M 4.0 in Chihuahua, Mexico was felt with intensity II-III in the area(s) of Chichihua, Mexico.
AFRICA AND EUROPE
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 29MAR2021 17:21:04 7.2S 155.1E mb=4.8 EMSC SOLOMON ISLANDS
O: 29MAR2021 07:43:37 7.0S 156.0E Mw=5.3 EMSC SOLOMON ISLANDS
P: 31MAR2021 132328 9.0S 158.0E 4.0-5.8 ABBAA Solomon Islands
OCEAN RIDGES
O: 30MAR2021 04:11:38 43.9N 28.9W mb=4.4 EMSC NORTHERN MID-ATLANTIC RIDGE
P: 31MAR2021 132456 45.0N 28.0W 4.0-5.6 ABAAA No. Mid-Atlantic Ridge
No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.
ZEALANDIA AND AUSTRALIA REGION
O: 29MAR2021 23:32:26 29.6S 177.3W mb=4.7 EMSC KERMADEC ISLANDS, NEW ZEALAND
P: 29MAR2021 132546 30.0S 178.0W 4.0-5.4 AAAAA No. Kermadec Islands
O: 29MAR2021 07:01:13 37.1S 178.9E ML=3.5 EMSC OFF E. COAST OF N. ISLAND, N.Z
O: 30MAR2021 04:36:34 37.2S 179.9E ML=3.8 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 30MAR2021 02:30:20 37.6S 179.9E ML=3.8 EMSC OFF E. COAST OF N. ISLAND, N.Z.
P: 27MAR2021 132548 37.0S 178.0E 3.0-4.9 AAAAA North Island, N.Z.
O: 29MAR2021 20:57:42 37.3S 180.0W ML=3.8 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 25MAR2021 132545 37.0S 180.0W 3.5-5.1 BAAAA E. of North Islands N.Z.
O: 30MAR2021 05:33:27 44.6S 167.4E ML=3.7 EMSC SOUTH ISLAND OF NEW ZEALAND
O: 30MAR2021 05:16:04 44.6S 167.4E ML=4.3 EMSC SOUTH ISLAND OF NEW ZEALAND
P: 26MAR2021 132557 44.0S 168.0E 3.0-4.9 BAAAA So. Island, N.Z.
JAPAN AND KURIL ISLANDS
No earthquakes of M>=4 were located in Japan or the Kuril Islands today.
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 29MAR2021 07:04:38 36.8N 120.9W Md=2.0 EMSC CENTRAL CALIFORNIA
O: 29MAR2021 16:46:55 36.8N 121.0W Md=2.0 EMSC CENTRAL CALIFORNIA
O: 30MAR2021 06:25:52 36.4N 121.0W Md=2.3 EMSC CENTRAL CALIFORNIA
O: 30MAR2021 05:43:48 37.4N 121.8W Md=2.6 EMSC SAN FRANCISCO BAY AREA, CALIF.
P: 29MAR2021 132382 36.4N 121.0W 2.5-4.7 AAAAA Central California
NEIC reported this earthquake of M 2.6 in San Jose, California was felt with intensity II-III in the area(s) of San Jose, California.
O: 29MAR2021 14:11:52 39.6N 119.4W ml=2.1 EMSC NEVADA
P: 23MAR2021 132380 39.1N 119.6W 2.5-4.8 CAAAA California/Nevada area
O: 29MAR2021 10:38:27 38.1N 118.0W ML=3.4 EMSC NEVADA
O: 29MAR2021 18:42:00 38.2N 118.0W ml=2.0 EMSC NEVADA
P: 28MAR2021 132377 37.8N 118.2W 2.5-4.8 AAAAA California/Nevada area
O: 30MAR2021 06:37:38 40.0N 123.8W Md=2.1 EMSC NORTHERN CALIFORNIA
P: 29MAR2021 132384 39.8N 123.5W 2.5-4.6 AAAAA Central California
ALASKA
O: 29MAR2021 23:49:04 52.7N 176.1W mb=4.3 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
P: 29MAR2021 132479 51.9N 176.0W 3.5-5.3 AAAAA Andreanoff Isls, Aleutians
O: 29MAR2021 11:05:37 56.1N 149.8W ML=3.0 EMSC GULF OF ALASKA
P: 25MAR2021 132499 55.1N 149.4W 3.2-5.3 BAAAA Central Alaska
O: 29MAR2021 08:25:49 63.3N 151.1W ML=3.5 EMSC CENTRAL ALASKA
P: 25MAR2021 132503 63.2N 151.4W 3.2-5.0 BAAAA Central Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 30MAR2021 00:06:12 72.2N 133.1W MB=5.3 ECAN Baillie, NT
O: 30MAR2021 00:06:08 72.3N 133.3W Mw=5.1 EMSC BEAUFORT SEA
P: 30MAR2021 132511 71.0N 134.0W 2.5-4.0 ABAAA Yukon Territory, Canada
ROCKY MOUNTAINS REGION
O: 29MAR2021 07:34:33 38.3N 113.1W Ml=2.0 EMSC UTAH
O: 29MAR2021 23:15:51 38.3N 113.1W Ml=2.1 EMSC UTAH
O: 29MAR2021 23:15:51 38.3N 113.1W Ml=2.1 EMSC UTAH
O: 30MAR2021 06:36:46 38.3N 113.1W Ml=2.5 EMSC UTAH
O: 29MAR2021 19:40:12 38.4N 113.1W ML=3.3 EMSC UTAH
P: 29MAR2021 132432 38.7N 112.6W 2.0-3.9 AAAAA Utah area
O: 29MAR2021 18:53:28 39.4N 110.3W MD=2.0 EMSC UTAH
P: 27MAR2021 132433 39.7N 110.8W 2.0-3.9 AAAAA Utah area
O: 30MAR2021 05:41:32 39.7N 111.6W Ml=2.1 EMSC UTAH
O: 30MAR2021 05:41:32 39.7N 111.6W Ml=2.1 EMSC UTAH
P: 31MAR2021 132433 39.7N 111.9W 2.0-4.0 AAAAA Utah area
O: 29MAR2021 14:05:52 44.3N 115.0W Ml=2.1 EMSC SOUTHERN IDAHO
O: 29MAR2021 21:34:46 44.4N 115.1W ML=2.6 EMSC SOUTHERN IDAHO
O: 29MAR2021 21:38:28 44.4N 115.2W Ml=2.0 EMSC SOUTHERN IDAHO
O: 30MAR2021 06:55:29 44.2N 115.1W Ml=2.1 EMSC SOUTHERN IDAHO
P: 27MAR2021 132451 44.5N 114.7W 2.0-4.3 BAAAA Montana/Idaho
EASTERN U.S./CANADA
O: 29MAR2021 16:08:12 58.9N 78.0W ML=3.0 EMSC NGAVA PENINSULA, QUEBEC, CANAD
O: 29MAR2021 16:08:12 58.9N 77.9W MB=3.0 ECAN Inukjuak, QC
P: 27MAR2021 132490 59.0N 76.0W 2.0-4.1 AAAAA Quebec, Canada
P: 31MAR2021 132497 60.0N 79.0W 2.5-4.3 ABAAA Baffin/Davis Strait Canada
O: 29MAR2021 01:41:49 47.4N 70.3W MB=1.4 ECAN Charlevoix Seismic Zone
P: 30MAR2021 132455 47.3N 70.5W 2.0-3.9 AAAAA New England
O: 28MAR2021 06:56:48 72.0N 77.4W MB=3.3 ECAN Pond Inlet, NU
P: 30MAR2021 132509 71.0N 75.0W 2.5-3.9 AAAAA Baffin/Davis Strait Canada
O: 29MAR2021 08:40:12 35.1N 95.4W ML=2.0 EMSC OKLAHOMA
O: 29MAR2021 16:00:09 34.4N 97.4W ML=2.3 EMSC OKLAHOMA
P: 27MAR2021 132426 35.0N 96.0W 2.0-4.1 AAAAA Southern Plains
O: 29MAR2021 15:57:08 36.0N 89.9W Md=2.0 EMSC SOUTHEASTERN MISSOURI
P: 27MAR2021 132396 36.7N 89.7W 2.0-3.9 AAAAA New Madrid area
HAWAII
O: 29MAR2021 18:13:56 18.4N 154.1W ML=3.1 EMSC HAWAII REGION, HAWAII
P: 25MAR2021 132360 19.4N 155.1W 4.0-5.5 AAAAA Hawaii area
MODERATE QUAKE SHAKES BARBADOS, WINDWARD ISLANDS
EARTHQUAKE SUMMARY FOR MARCH 28, 2021
An earthquake of M 5.5 was felt in Barbados, Windward Islands today. NEIC reported it was felt with intensity III in Crane Saint Philip, Barbados. This is the strongest earthquake within about 300 km of this epicenter in Barbados and the Windward Islands since an M 5.8 on February 3, 2017. The only event of M>=6 in the Barbados in the past 30 years were an M 6.5 on July 16, 2015 and an M 6.5 on February 18, 2014. At the time this summary noted:
"A series of moderate to strong earthquakes hit the region of Barbados today. These began with an M 5.7, a foreshock to the strongest event of M 6.5. This second event was probably triggered by the new moon tidal stresses. This event occurred within 15 minutes of local solar noon, a maximum time for tidal stresses. This was followed minutes later by an aftershock of M 5.2. …. As these earthquakes occurred far offshore, no damage or casualties were reported or expected from these events. The last earthquake within 200 km of this epicenter with M>=6.5 occurred as a similar M 6.5 on February 18, 2014, the only such event in the area in at least 25 years." (July 17, 2015)
Today's event occurred near local solar midnight and, like the event in July, 2015 occurred with a full or new moon and was likely promoted by high tidal stresses associated with today's full moon. The M 6.5 in Martinique of February 18, 2014 occurred three days after the full moon early on February 15. This epicenter is located at the third node (120 degrees) from the M 8.1 in the Kermadec Islands and from the North Island, New Zealand quake of M 7.3 on March 3 and near this distance from the events in Honshu Japan of M 7.1 and 7.2 and was probably promoted by strong seismic energy from those sources.
O: 29MAR2021 06:35:09 13.8N 58.5W mb=5.5 EMSC BARBADOS REGION, WINDWARD ISL.
P: 31MAR2021 132356 10.0N 63.0W 3.4-4.9 ACCAA Windward Islands
The largest earthquake of the day was an M 5.6-5.8 in the Northern Mid-Atlantic Ridge north of the Azores Islands. It was not reported felt in this remote area. The last earthquake within about 300 km of this epicenter with M>=5.6 occurred on August 31, 2011 with M 5.6. A similar M 5.8 occurred in the area on March 20, 2021 about 400 km north of today's epicenter. A foreshock of M 4.6 hit near today's epicenter on February 3, 2021. When the event occurred on March 20, 2021 this summary commented in this regard:
"A strong near-antipodal pair also occurred today in the Macquarie Islands south
of Australia and in the northern mid-Atlantic Ridge with M 6.1 and 5.7 respectively. Forecast 132204 had expected the area south of this in the Northern Mid-Atlantic Ridge was likely to see elevated seismicity in mid-March. The only other such earthquake with M>=5.8 within about 200 km of this epicenter in the past 30 years was an M 5.9 on December 19, 2008." (March 20, 2021)
This epicenter is near 100 degrees from the recent events of M 7.1 and 7.2 off the coast of Honshu, Japan and was probably promoted by concentrated energy from those sources.
Forecast 132456 had expected an event with magnitude up to M 5.6 was likely in the region within about 150 km of this epicenter around March 31. This event occurred near local solar midnight and may have been promoted by strong tidal stresses associated with today's full moon. The tidal forecast in this summary for this full moon had read:
"The full moon arrived on March 28, 2021 at 18:48 UT. Longitudes which were at sub-solar conditions at this time area near 102 West and anti-solar (local solar midnight) at 78 East longitude. These include in the West regions of the Rocky Mountains and western North America and in the east Afghanistan, Tajikistan, Xinjiang, China and Central Asia. These areas may see enhanced seismicity due to tidal effects over the next week. Seismicity may shift to times closer to local solar noon and midnight during this period, and a moderately large earthquake is possible at this time due to tidal triggering." (March 25-28, 2021)
This epicenter is at 104 degrees from the events of M 7.1 and 7.2 off Honshu, Japan of February 13 and March 20, 2021 and was probably promoted by energy from those events.
O: 28MAR2021 23:01:46 43.6N 28.8W mb=5.6 EMSC NORTHERN MID-ATLANTIC RIDGE
O: 28MAR2021 23:01:46 43.6N 28.8W mb=5.8 ANSS NORTHERN MID-ATLANTIC RIDGE
P: 31MAR2021 132456 45.0N 28.0W 4.0-5.6 BBAAA No. Mid-Atlantic Ridge
Along with the moderate quakes in the North Atlantic an M 4.7 also occurred south of Michoacan, Mexico in the northern East Pacific Rise today. It was not reported felt in this remote area. An M 5.7 occurred near this epicenter on December 23, 2020. Forecast 132302 had expected today's event was likely within about 100 km of this epicenter around March 27.
O: 28MAR2021 14:29:46 8.1N 102.9W mb=4.7 EMSC NORTHERN EAST PACIFIC RISE
P: 27MAR2021 132302 9.0N 103.0W 4.0-5.7 AAAAA Central Pacific Ocean
The strongest earthquake in the U.S. or Canada today was an M 4.5 in the Unimak Island of Alaska. This epicenter is to the west of the Alaska Peninsula and may be part of the aftershocks sequence of the October 19, 2020 event of M 7.6 in that region. Forecast 132495 had expected today's event in the Unimak area was likely around March 24.
O: 28MAR2021 07:52:00 53.3N 163.7W mb=4.5 EMSC UNIMAK ISLAND REGION, ALASKA
P: 24MAR2021 132495 54.3N 162.7W 3.5-5.1 BAAAA Unimak Islands, Aleutians
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 29MAR2021 04:04:12 19.1N 103.1E ML=3.9 EMSC LAOS
O: 29MAR2021 04:10:10 19.1N 103.2E ML=4.0 EMSC LAOS
O: 28MAR2021 12:47:11 27.8N 64.8E mb=4.4 EMSC SOUTHWESTERN PAKISTAN
P: 25MAR2021 132366 29.0N 68.0E 3.5-4.9 BBCAA Pakistan
NEIC reported this earthquake of M 4.4 in Southwestern Pakistan was felt with intensity V in the area(s) of Southwestern Pakistan at Kharan.
O: 28MAR2021 18:38:16 54.7N 162.3E mb=4.6 EMSC NEAR EAST COAST OF KAMCHATKA
P: 26MAR2021 132484 54.0N 161.0E 4.0-5.6 AAAAA E. of Kamchatka
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 28MAR2021 19:35:19 1.4S 100.5E ML=4.1 EMSC SOUTHERN SUMATRA, INDONESIA
P: 28MAR2021 132311 0.0N 99.0E 4.0-5.4 ABBAA So. Sumatera
O: 28MAR2021 07:33:10 3.0S 139.7E ML=4.3 EMSC NEAR N COAST OF PAPUA, INDONES
P: 26MAR2021 132332 3.0S 139.0E 4.0-5.6 AAAAA West Irian, PNG
O: 29MAR2021 04:13:18 4.5S 102.7E Mw=5.0 EMSC SOUTHERN SUMATRA, INDONESIA
P: 29MAR2021 132327 4.0S 103.0E 4.0-5.5 AAAAA So. of Sumatera
O: 28MAR2021 13:34:36 6.0S 141.2E mb=4.7 EMSC NEW GUINEA, PAPUA NEW GUINEA
P: 26MAR2021 132332 3.0S 139.0E 4.0-5.6 ACBAA West Irian, PNG
NEIC reported this earthquake of M 4.7 in New Guinea was felt with intensity II-III in the area(s) of New Guinea at Goroka (IV); Port Moresby, Balimo and Kiunga, Fly River, PNG.
O: 28MAR2021 23:26:43 6.4S 129.6E mb=4.4 EMSC BANDA SEA
P: 30MAR2021 132313 7.0S 129.0E 4.0-5.4 AAAAA Banda Sea
O: 28MAR2021 08:30:07 7.8S 127.8E ML=4.5 EMSC KEPULAUAN BARAT DAYA, INDONESI
P: 26MAR2021 132313 7.0S 127.0E 4.0-5.4 AAAAA Banda Sea
O: 28MAR2021 11:52:27 9.6S 118.5E ML=4.1 EMSC SUMBAWA REGION, INDONESIA
P: 23MAR2021 132330 9.0S 118.0E 4.0-5.4 BAAAA Sumbawa Island area
P: 28MAR2021 132330 8.0S 117.0E 4.0-5.6 ABBAA Sumbawa Island area
O: 28MAR2021 14:09:00 9.8S 107.3E ML=4.0 EMSC SOUTH OF JAVA, INDONESIA
P: 24MAR2021 132326 9.0S 108.0E 4.0-5.7 BAAAA So. of Java
CENTRAL AND SOUTH AMERICA
O: 28MAR2021 15:01:16 5.2N 72.8W mb=4.6 EMSC COLOMBIA
P: 23MAR2021 132303 5.0N 78.0W 4.0-5.6 BACAA Colombia
NEIC reported this earthquake of M 4.6 in Colombia was felt with intensity II-III in the area(s) of Colombia at La Calera.
O: 28MAR2021 15:41:25 12.9N 88.8W ML=4.3 EMSC OFFSHORE EL SALVADOR
P: 30MAR2021 132350 13.0N 88.0W 3.5-5.5 AAAAA Nicaragua
O: 29MAR2021 06:35:09 13.8N 58.5W mb=5.5 EMSC BARBADOS REGION, WINDWARD ISL.
P: 31MAR2021 132356 10.0N 63.0W 3.4-4.9 ACCAA Windward Islands
O: 29MAR2021 01:49:08 14.3N 89.7W mb=4.6 EMSC GUATEMALA
P: 30MAR2021 132342 14.0N 91.0W 3.5-5.3 AAAAA Guatemala
O: 29MAR2021 06:04:36 15.4N 94.8W ML=4.2 EMSC OFFSHORE OAXACA, MEXICO
O: 28MAR2021 16:11:20 15.4N 94.8W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO
P: 31MAR2021 132339 17.0N 95.0W 3.5-5.3 BBAAA Chiapas, Mexico
O: 28MAR2021 07:14:21 15.4S 71.9W mb=4.8 EMSC SOUTHERN PERU
P: 27MAR2021 132521 16.0S 71.0W 4.0-5.8 AAAAA So. Peru/Bolivia
O: 29MAR2021 06:18:50 15.5N 93.2W ML=4.0 EMSC CHIAPAS, MEXICO
P: 28MAR2021 132342 14.0N 92.0W 3.5-5.3 ABAAA Guatemala
O: 28MAR2021 20:01:44 18.0N 66.8W Md=3.0 EMSC PUERTO RICO REGION
P: 27MAR2021 132354 19.0N 67.0W 3.4-5.3 AAAAA Puerto Rico
O: 29MAR2021 01:48:50 18.8N 64.6W ML=3.5 EMSC VIRGIN ISLANDS REGION
P: 28MAR2021 132344 19.0N 64.0W 3.0-5.1 AAAAA Leeward Islands
O: 29MAR2021 04:18:45 19.7N 105.5W ML=4.2 EMSC OFFSHORE JALISCO, MEXICO
P: 28MAR2021 132341 18.0N 106.0W 3.5-5.7 ABAAA Coast of Jalisco, Mexico
O: 28MAR2021 09:20:13 20.2S 70.4W ML=4.0 EMSC OFFSHORE TARAPACA, CHILE
P: 29MAR2021 132538 20.0S 70.0W 4.0-5.4 AAAAA So. Peru/Bolivia
NEIC reported this earthquake of M 4.0 in northern Chile was felt with intensity II-III in the area(s) of northern Chile at Tarapaca in Iquique.
O: 28MAR2021 21:55:24 24.1S 67.0W mb=4.3 EMSC SALTA, ARGENTINA
P: 29MAR2021 132529 24.0S 68.0W 4.0-5.9 AAAAA Argentina
O: 28MAR2021 20:22:00 28.3N 105.1W ML=4.1 EMSC CHIHUAHUA, MEXICO
O: 28MAR2021 23:40:04 44.8S 80.7W mb=4.7 EMSC OFF COAST OF AISEN, CHILE
P: 26MAR2021 132553 43.0S 83.0W 4.0-5.5 ABBAA Chile Rise
AFRICA AND EUROPE
O: 28MAR2021 07:01:35 37.2N 3.8W ML=3.3 EMSC SPAIN
P: 28MAR2021 132392 36.0N 4.0W 3.5-5.0 ABAAA Morocco/Spain
O: 28MAR2021 17:43:08 42.7N 16.2E ML=3.8 EMSC ADRIATIC SEA
P: 27MAR2021 132445 44.0N 16.0E 3.0-5.1 ABAAA Italy
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 28MAR2021 13:49:59 15.3S 175.2W mb=4.4 EMSC TONGA
P: 25MAR2021 132518 15.0S 176.0W 4.0-5.6 BAAAA Samoa Islands
OCEAN RIDGES
O: 28MAR2021 14:29:46 8.1N 102.9W mb=4.7 EMSC NORTHERN EAST PACIFIC RISE
P: 27MAR2021 132302 9.0N 103.0W 4.0-5.7 AAAAA Central Pacific Ocean
O: 28MAR2021 23:01:46 43.6N 28.8W mb=5.6 EMSC NORTHERN MID-ATLANTIC RIDGE
P: 31MAR2021 132456 45.0N 28.0W 4.0-5.6 BBAAA No. Mid-Atlantic Ridge
O: 28MAR2021 16:27:26 62.4S 58.4W mb=5.0 EMSC SOUTH SHETLAND ISLANDS
P: 24MAR2021 132562 61.0S 58.0W 3.0-5.6 AAAAA So. So. America
ZEALANDIA AND AUSTRALIA REGION
O: 28MAR2021 23:08:39 27.1S 179.4E mb=4.6 EMSC KERMADEC ISLANDS REGION
P: 25MAR2021 132547 35.0S 179.0E 3.0-4.5 BCAAA North Island, N.Z.
O: 29MAR2021 03:52:15 33.5S 179.5E ML=3.9 EMSC SOUTH OF KERMADEC ISLANDS
P: 25MAR2021 132547 35.0S 179.0E 3.0-4.5 BBAAA North Island, N.Z.
JAPAN AND KURIL ISLANDS
O: 28MAR2021 08:12:01 42.1N 142.6E mb=4.5 EMSC HOKKAIDO, JAPAN REGION
P: 29MAR2021 132444 44.0N 142.0E 3.5-5.6 ABAAA Hokkaido, Japan
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 28MAR2021 16:54:39 38.1N 121.9W Md=2.3 EMSC SAN FRANCISCO BAY AREA, CALIF.
P: 19MAR2021 132129 37.9N 122.0W 2.5-4.4 CAAAA Central California
O: 28MAR2021 07:28:41 38.2N 117.8W ml=2.0 EMSC NEVADA
P: 28MAR2021 132377 37.8N 118.2W 2.5-4.8 AAAAA California/Nevada area
O: 28MAR2021 09:53:59 38.8N 122.8W Md=2.1 EMSC NORTHERN CALIFORNIA
P: 31MAR2021 132383 38.7N 122.7W 2.5-4.5 BAAAA Central California
ALASKA
O: 28MAR2021 07:52:00 53.3N 163.7W mb=4.5 EMSC UNIMAK ISLAND REGION, ALASKA
P: 24MAR2021 132495 54.3N 162.7W 3.5-5.1 BAAAA Unimak Islands, Aleutians
O: 29MAR2021 00:15:12 57.4N 155.0W ML=3.1 EMSC ALASKA PENINSULA
P: 29MAR2021 132477 54.7N 156.9W 3.5-5.3 ACAAA Alaska Peninsula
O: 29MAR2021 01:05:52 61.2N 146.4W Mw=3.9 EMSC SOUTHERN ALASKA
P: 29MAR2021 132499 60.6N 147.6W 3.2-5.3 AAAAA Central Alaska
NEIC reported this earthquake of M 3.7 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska at Valdez (IV), Seward and Anchorage.
O: 28MAR2021 23:23:25 62.8N 149.7W ML=3.5 EMSC CENTRAL ALASKA
P: 27MAR2021 132503 62.7N 149.3W 3.2-4.9 AAAAA Central Alaska
O: 28MAR2021 08:00:47 65.9N 146.9W ML=3.3 EMSC NORTHERN ALASKA
P: 27MAR2021 132503 62.7N 149.3W 3.2-4.9 ACAAA Central Alaska
NEIC reported this earthquake of M 3.1 in northern Alaska was felt with intensity II-III in the area(s) of northern Alaska at Fairbanks.
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 28MAR2021 10:30:30 42.2N 124.5W Ml=2.2 EMSC OFFSHORE OREGON
P: 28MAR2021 132460 40.2N 124.2W 2.5-4.4 ABAAA Off Coast of No. Calif
ROCKY MOUNTAINS REGION
O: 28MAR2021 11:07:47 44.4N 114.7W Ml=2.2 EMSC SOUTHERN IDAHO
O: 28MAR2021 09:50:46 44.4N 114.7W Ml=2.4 EMSC SOUTHERN IDAHO
P: 27MAR2021 132451 44.5N 114.7W 2.0-4.3 AAAAA Montana/Idaho
O: 29MAR2021 02:44:41 38.3N 113.1W ML=2.5 EMSC UTAH
O: 29MAR2021 04:46:06 38.3N 113.1W ML=2.5 EMSC UTAH
O: 29MAR2021 01:35:56 38.3N 113.1W ML=3.4 EMSC UTAH
P: 29MAR2021 132432 38.7N 112.6W 2.0-3.9 AAAAA Utah area
NEIC reported this earthquake of M 3.2 in Utah was felt with intensity II-III in the area(s) of Utah at Milford.
EASTERN U.S./CANADA
O: 28MAR2021 21:14:35 35.1N 95.4W ML=2.3 EMSC OKLAHOMA
O: 29MAR2021 02:33:17 35.1N 95.3W ML=2.2 EMSC OKLAHOMA
O: 29MAR2021 06:08:50 35.8N 96.7W ML=2.1 EMSC OKLAHOMA
O: 28MAR2021 18:58:28 35.1N 95.4W ML=2.3 EMSC OKLAHOMA
P: 27MAR2021 132426 35.0N 96.0W 2.0-4.1 AAAAA Southern Plains
O: 28MAR2021 22:34:06 36.3N 98.2W ML=2.1 EMSC OKLAHOMA
P: 26MAR2021 132427 37.0N 98.0W 2.0-4.2 AAAAA Southern Plains
HAWAII
O: 28MAR2021 17:05:41 19.9N 155.5W ML=3.2 EMSC ISLAND OF HAWAII, HAWAII
O: 28MAR2021 13:10:05 19.2N 155.5W ML=3.0 EMSC ISLAND OF HAWAII, HAWAII
P: 25MAR2021 132360 19.4N 155.1W 4.0-5.5 BAAAA Hawaii area
UNUSUAL QUAKE OF M 5.5 EAST OF ITALY WIDELY FELT
EARTHQUAKE SUMMARY FOR MARCH 27, 2021
An earthquake of M 5.5 in the Adriatic Sea was widely felt in Italy today. NEIC reported maximum intensity IV in Italy at Santa Maria, Imbaro and Trani Apulien and II-III in San Marco in Lamis Apulien, Termoli, Foggia, Barietta, Frncavilla al Mare, Ripa Teatina, Pescara and Montesilvano, Abruzzen. This is the strongest earthquake within about 200 km of this epicenter since a similar M 5.5 northwest of this on March 29, 2003. The largest earthquake in the area in the past 30 years was an M 6.0 on September 5, 1996. Forecast 132445 had expected today's event in Italy was likely within about 150 km of this epicenter around March 27.
O: 27MAR2021 14:01:03 42.5N 16.1E mb=4.3 EMSC ADRIATIC SEA
O: 27MAR2021 14:13:38 42.5N 16.1E ML=4.1 EMSC ADRIATIC SEA
O: 27MAR2021 14:21:48 42.5N 16.1E mb=4.4 EMSC ADRIATIC SEA
O: 27MAR2021 13:47:52 42.7N 16.4E Mw=5.5 EMSC ADRIATIC SEA
P: 27MAR2021 132445 44.0N 16.0E 3.0-5.1 ABAAA Italy
The strongest earthquake in the world today was an M 5.7 in southeastern Japan in the Izu Islands. NEIC reported it was felt with intensity III in Kanagawa, Japan. This is the strongest earthquake in the Izu Islands of Japan since an M 6.0 on November 9, 2019 and an aftershock of M 5.8 on November 15, 2017. Forecast 132403 had expected today's activity within about 100 km was likely around March 23.
O: 28MAR2021 02:41:30 33.6N 140.4E ML=4.4 EMSC IZU ISLANDS, JAPAN REGION
O: 28MAR2021 00:26:57 33.6N 140.3E Mw=5.8 EMSC IZU ISLANDS, JAPAN REGION
P: 23MAR2021 132403 34.0N 141.0E 4.0-5.7 BAAAA Off East Coast Honshu
A moderate earthquake of M 4.2 shook the region off northwestern California today. NEIC reported it was felt with intensity II-III in Eureka, California. The last earthquake within about 100 km of this epicenter with M>=4.2 occurred on January 17, 2021of M 4.4 and an M 4.3 on January 12, 2021, the only such events in the area in the past year. Forecast 132459 had expected today's event within about 25 km was likely around March 28.
O: 28MAR2021 00:19:22 40.4N 125.5W Mw=4.1 EMSC OFFSHORE NORTHERN CALIFORNIA
P: 28MAR2021 132459 40.5N 125.8W 2.5-4.4 AAAAA Off Coast of No. Calif
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 28MAR2021 06:41:17 24.6N 122.8E mb=4.8 EMSC TAIWAN REGION
O: 28MAR2021 06:41:18 24.5N 122.8E ML=5.2 TAI Hualien, Taiwan
P: 28MAR2021 132370 24.0N 125.0E 4.0-5.4 AABAA Taiwan
CWB reported this earthquake was felt with intensity III in Hualien; II in Yilan, Nantou, Changhua, Taitung, Taipei, Miaoli, and Hsinchu, Counties, Taiwan.
O: 27MAR2021 17:24:13 35.5N 89.5E mb=4.5 EMSC WESTERN XIZANG
P: 28MAR2021 132436 35.0N 93.0E 3.8-5.4 AACAA Xizang
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 27MAR2021 09:46:12 1.5N 127.2E Mw=5.0 EMSC HALMAHERA, INDONESIA
P: 28MAR2021 132307 2.0N 127.0E 4.0-5.6 AAAAA Halmahera
O: 27MAR2021 10:18:05 2.0S 99.3E mb=4.7 EMSC KEP. MENTAWAI REGION, INDONESIA
P: 28MAR2021 132311 0.0N 99.0E 4.0-5.4 ABAAA So. Sumatera
O: 27MAR2021 15:28:57 4.6S 139.9E ML=4.1 EMSC PAPUA, INDONESIA
O: 27MAR2021 15:07:06 2.3S 140.1E ML=4.3 EMSC EAR N COAST OF PAPUA, INDONESI
P: 26MAR2021 132332 3.0S 139.0E 4.0-5.6 AAAAA West Irian, PNG
O: 27MAR2021 08:46:40 2.5N 99.0E mb=4.8 EMSC NORTHERN SUMATRA, INDONESIA
P: 24MAR2021 132311 1.0N 98.0E 4.0-5.5 BBAAA So. Sumatera
O: 28MAR2021 04:18:24 2.8N 124.3E ML=4.3 EMSC CELEBES SEA
P: 28MAR2021 132307 2.0N 127.0E 4.0-5.6 AACAA Halmahera
O: 27MAR2021 17:33:44 3.0S 139.6E ML=4.1 EMSC PAPUA, INDONESIA
P: 26MAR2021 132332 3.0S 139.0E 4.0-5.6 AAAAA West Irian, PNG
O: 28MAR2021 02:58:49 5.2S 142.8E ML=4.3 EMSC NEW GUINEA, PAPUA NEW GUINEA
P: 22MAR2021 132325 7.0S 144.0E 4.0-5.5 CBAAA Papua New Guinea
O: 27MAR2021 09:12:08 10.7S 113.8E ML=4.4 EMSC SOUTH OF JAVA, INDONESIA
P: 26MAR2021 132522 11.0S 116.0E 4.0-5.4 AABAA So. of Indonesia
CENTRAL AND SOUTH AMERICA
O: 27MAR2021 07:14:52 13.9N 92.8W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO
P: 28MAR2021 132342 14.0N 92.0W 3.5-5.3 AAAAA Guatemala
O: 27MAR2021 10:42:54 16.5N 99.1W ML=4.5 EMSC OFFSHORE GUERRERO, MEXICO
P: 24MAR2021 132353 17.0N 100.0W 3.5-5.1 BAAAA Oaxaca, Mexico
O: 27MAR2021 11:13:33 19.2N 66.5W Md=3.2 EMSC PUERTO RICO REGION
P: 27MAR2021 132354 19.0N 67.0W 3.4-5.3 AAAAA Puerto Rico
O: 27MAR2021 20:17:10 19.9S 69.9W Mw=4.5 EMSC TARAPACA, CHILE
P: 29MAR2021 132538 20.0S 70.0W 4.0-5.4 AAAAA So. Peru/Bolivia
NEIC reported this earthquake of M 4.5 in Tarapaca Chile was felt with intensity II-III in the area(s) of Tarapaca Chile in Iquique and Arica.
O: 28MAR2021 02:03:52 20.2N 70.7W ML=3.0 EMSC DOMINICAN REPUBLIC REGION
P: 26MAR2021 132354 19.0N 71.0W 3.4-5.3 ABAAA Puerto Rico
No significant (M>=5) or unusual earthquakes were reported in Central or South America today.
AFRICA AND EUROPE
O: 27MAR2021 19:13:24 12.8S 45.6E ML=3.3 EMSC MAYOTTE REGION
P: 25MAR2021 132516 12.0S 45.0E 3.0-4.6 AAAAA Madagascar area
O: 27MAR2021 14:01:03 42.5N 16.1E mb=4.3 EMSC ADRIATIC SEA
O: 27MAR2021 14:13:38 42.5N 16.1E ML=4.1 EMSC ADRIATIC SEA
O: 27MAR2021 14:21:48 42.5N 16.1E mb=4.4 EMSC ADRIATIC SEA
O: 27MAR2021 13:47:52 42.7N 16.4E Mw=5.5 EMSC ADRIATIC SEA
P: 27MAR2021 132445 44.0N 16.0E 3.0-5.1 ABAAA Italy
O: 27MAR2021 13:00:45 41.1N 19.4E ML=3.4 EMSC ADRIATIC SEA
P: 28MAR2021 132437 42.0N 19.0E 3.0-5.1 AAAAA Adriatic Sea
SOUTHWEST PACIFIC
O: 27MAR2021 11:14:44 21.3S 171.2E mb=4.8 EMSC SOUTHEAST OF LOYALTY ISLANDS
P: 27MAR2021 132531 22.0S 172.0E 4.0-5.4 AAAAA Loyalty Islands
O: 27MAR2021 21:09:11 25.0S 179.6E mb=4.4 EMSC SOUTH OF FIJI ISLANDS
No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.
OCEAN RIDGES
O: 27MAR2021 09:19:37 61.6S 55.0W mb=4.5 EMSC SOUTH SHETLAND ISLANDS
O: 28MAR2021 16:27 62.4S 58.5W mb=4.5 GUC Antartida at Antartida, Base F
P: 24MAR2021 132562 61.0S 58.0W 3.0-5.6 BBAAA So. So. America
GUC reported this earthquake was felt with intensity V in Antartida at Antartida, Base Frei and IV in Base Prat, Chile.
No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.
ZEALANDIA AND AUSTRALIA REGION
O: 27MAR2021 09:20:29 30.0S 177.2W mb=4.5 EMSC KERMADEC ISLANDS, NEW ZEALAND
P: 29MAR2021 132546 30.0S 178.0W 4.0-5.4 AAAAA No. Kermadec Islands
O: 27MAR2021 21:10:34 33.1S 178.5E ML=4.5 EMSC SOUTH OF KERMADEC ISLANDS
O: 27MAR2021 23:02:35 33.8S 179.9E ML=3.8 EMSC SOUTH OF KERMADEC ISLANDS
P: 25MAR2021 132547 35.0S 179.0E 3.0-4.5 ABAAA North Island, N.Z.
O: 27MAR2021 13:28:54 37.8S 179.8E mb=4.4 EMSC OFF E. COAST OF N. ISLAND, N.Z
O: 27MAR2021 13:28:58 37.7S 179.5E ML=4.4 GEONET Felt with weak intensity
P: 26MAR2021 132549 38.0S 178.0E 3.0-4.4 AABAA North Island, N.Z.
GEONET reported this earthquake was felt with weak intensity in North Island, New Zealand with 2 reports of which 2 reported weak shaking; 0 light, 0 moderate, 0 strong, 0 Severe and 0 extreme intensity.
JAPAN AND KURIL ISLANDS
O: 28MAR2021 02:41:30 33.6N 140.4E ML=4.4 EMSC IZU ISLANDS, JAPAN REGION
O: 28MAR2021 00:26:57 33.6N 140.3E Mw=5.8 EMSC IZU ISLANDS, JAPAN REGION
P: 23MAR2021 132403 34.0N 141.0E 4.0-5.7 BAAAA Off East Coast Honshu
O: 27MAR2021 07:34:54 45.1N 151.1E mb=4.5 EMSC KURIL ISLANDS
P: 27MAR2021 132444 44.0N 149.0E 3.5-5.4 ABBAA Hokkaido, Japan
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 27MAR2021 07:05:08 35.8N 117.6W Ml=2.0 EMSC SOUTHERN CALIFORNIA
O: 27MAR2021 20:40:05 35.9N 117.7W Ml=2.2 EMSC CENTRAL CALIFORNIA
O: 27MAR2021 09:17:19 35.7N 117.6W Ml=2.1 EMSC SOUTHERN CALIFORNIA
P: 29MAR2021 132375 36.3N 118.1W 2.5-4.8 AAAAA California/Nevada area
O: 27MAR2021 08:17:09 32.6N 115.7W Ml=2.5 EMSC BAJA CALIFORNIA, MEXICO
P: 29MAR2021 132411 32.5N 115.7W 2.5-4.4 AAAAA So. California
O: 27MAR2021 22:09:30 33.6N 116.7W Ml=2.1 EMSC SOUTHERN CALIFORNIA
P: 25MAR2021 132413 33.9N 116.9W 2.5-4.4 AAAAA So. California
O: 27MAR2021 15:55:31 35.4N 118.9W Ml=2.0 EMSC BAKERSFIELD URBAN AREA, CALIF.
P: 26MAR2021 132419 35.0N 119.2W 2.5-5.0 AAAAA So. California
O: 27MAR2021 08:49:36 36.6N 121.3W ML=2.4 EMSC CENTRAL CALIFORNIA
P: 29MAR2021 132382 36.4N 121.0W 2.5-4.7 AAAAA Central California
NEIC reported this earthquake of M 2.6 in Central California was felt with intensity II-III in the area(s) of Central California at San Juan Bautista, Los Banos and Morgan Hill.
O: 27MAR2021 07:10:51 38.2N 117.9W ML=2.8 EMSC NEVADA
P: 31MAR2021 132378 38.6N 118.6W 2.5-4.6 BAAAA California/Nevada area
O: 27MAR2021 07:19:19 38.3N 119.5W Md=2.4 EMSC CENTRAL CALIFORNIA
P: 23MAR2021 132380 39.1N 119.6W 2.5-4.8 BAAAA California/Nevada area
O: 27MAR2021 09:00:37 38.7N 122.7W Md=2.1 EMSC NORTHERN CALIFORNIA
P: 31MAR2021 132383 38.7N 122.7W 2.5-4.5 BAAAA Central California
O: 28MAR2021 01:36:47 39.6N 119.8W ml=2.1 EMSC NEVADA
P: 23MAR2021 132380 39.1N 119.6W 2.5-4.8 BAAAA California/Nevada area
O: 28MAR2021 00:19:22 40.4N 125.5W Mw=4.1 EMSC OFFSHORE NORTHERN CALIFORNIA
P: 28MAR2021 132459 40.5N 125.8W 2.5-4.4 AAAAA Off Coast of No. Calif
ALASKA
O: 27MAR2021 13:30:02 52.8N 169.8W ML=3.3 EMSC FOX ISLANDS, ALEUTIAN ISLANDS
P: 25MAR2021 132481 52.4N 170.7W 3.5-5.1 AAAAA Andreanoff Isls, Aleutians
O: 27MAR2021 14:01:32 54.9N 156.8W ML=3.2 EMSC SOUTH OF ALASKA
P: 29MAR2021 132477 54.7N 156.9W 3.5-5.3 AAAAA Alaska Peninsula
O: 27MAR2021 11:24:09 58.6N 153.5W ML=3.1 EMSC KODIAK ISLAND REGION, ALASKA
P: 25MAR2021 132500 60.1N 153.4W 3.2-4.9 ABAAA Central Alaska
O: 27MAR2021 18:06:06 62.9N 149.8W ML=3.1 EMSC CENTRAL ALASKA
P: 27MAR2021 132503 62.7N 149.3W 3.2-4.9 AAAAA Central Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 27MAR2021 11:50:45 46.8N 119.8W Md=2.0 EMSC WASHINGTON
P: 28MAR2021 132452 47.7N 117.4W 2.0-4.1 AABAA Montana/Idaho
ROCKY MOUNTAINS REGION
O: 27MAR2021 12:00:28 31.7N 104.4W ML=2.9 EMSC WESTERN TEXAS
O: 27MAR2021 10:00:26 31.7N 104.4W ML=2.6 EMSC WESTERN TEXAS
P: 25MAR2021 132409 32.2N 104.1W 2.0-4.1 AAAAA SW U.S.A
EASTERN U.S./CANADA
O: 27MAR2021 09:33:19 34.4N 97.4W ML=2.2 EMSC OKLAHOMA
O: 27MAR2021 15:30:24 35.3N 98.0W ML=2.7 EMSC OKLAHOMA
O: 27MAR2021 23:26:18 35.4N 97.9W ML=2.2 EMSC OKLAHOMA
O: 27MAR2021 23:31:46 35.6N 97.1W ML=2.1 EMSC OKLAHOMA
P: 27MAR2021 132426 35.0N 96.0W 2.0-4.1 AAAAA Southern Plains
O: 27MAR2021 10:31:36 36.7N 97.7W ML=2.8 EMSC OKLAHOMA
P: 26MAR2021 132427 37.0N 98.0W 2.0-4.2 AAAAA Southern Plains
NEIC reported this earthquake of M 2.6 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma at Union City and Tuttle.
HAWAII
No earthquakes of M>=3 were located in Hawaii.
STRONG QUAKE IN RYUKYU ISLANDS, JAPAN
EARTHQUAKE SUMMARY FOR MARCH 26, 2021
The strongest earthquake in the world today was an M 5.9-6.8 in the Ryukyu Islands of Japan. NEIC reported it was felt with intensity II-III in Okinawa, Japan at Yomitan, Chatan, Ginowan, Okinawa, Ishikawa, Gushikawa. The Central Weather Bureau of Taiwan (CWB) reported this event with M 6.8 was widely felt in Taiwan. CWB reported this earthquake was felt with intensity II in Hualien and Taichung, and I in Yilan, Nantou, Taichung, Kaohsiung, Changhua, Yunlin, Taipei, Chiayi, Tainan and Keelung, Taiwan. The last earthquake of greater magnitude in this area of the Ryukyu Islands was an M 6.5 on March 2, 2014. Large events have since occurred close to Taiwan such as an M 6.0 on May 9, 2017 east of Taiwan. Forecasts 132370 and 132367 had expected today's activity was likely at the end of March.
O: 26MAR2021 22:02:16 26.1N 125.0E Mw=5.9 EMSC NORTHEAST OF TAIWAN
O: 26MAR2021 22:02:11 25.8N 125.5E ML=6.8 TAI Hualien, Taiwan
P: 28MAR2021 132370 24.0N 125.0E 4.0-5.4 ABAAA Taiwan
P: 30MAR2021 132367 26.0N 128.0E 4.0-5.4 BABAA Ryukyu Islands
A series of three moderate earthquakes also occurred today in Ocean Ridge areas - an M 5.0 and M 5.1 in the Southeast Indian Ridge; an M 5.2 in the Jan Mayen Islands and an M 5.7 and 5.7 in the Pacific Antarctic Ridge. These may be related to the current geomagnetic storm as they all occurred at high latitudes.
O: 26MAR2021 08:29:41 50.5S 112.8E mb=5.0 EMSC SOUTHEAST INDIAN RIDGE
O: 27MAR2021 06:59:58 71.4N 4.4W mb=5.2 EMSC JAN MAYEN ISLAND REGION
O: 26MAR2021 21:03:28 62.6S 161.6W Mw=5.7 EMSC PACIFIC-ANTARCTIC RIDGE
An earthquake of M 3.4 occurred today in western South Dakota. NEIC reported it was felt with intensity II-III in South Dakota at Edgemont, Hot Springs, Custer, Oelrichs, Rapid City, Spearfish, Holabiro and in Upton, Wyoming. Earthquakes in this area of South Dakota often precede by hours or days strong earthquakes in Alaska. This is the strongest earthquake within about 200 km of this epicenter since an M 3.6 on September 22, 2020. That event occurred in Wyoming and probably occurred in a quarry operation. The last earthquake in South Dakota within about 150 km of this epicenter with M>=3.4 was an M 3.5 on December 12, 2013. The strongest earthquake in this area in the past 30 years was an M 4.0 on November 14, 2011. Forecast 132441 had expected regional seismic enhancement was likely at the end of March.
O: 26MAR2021 14:52:24 43.3N 103.7W ML=3.4 EMSC SOUTH DAKOTA
P: 24MAR2021 132441 40.6N 106.6W 2.0-3.9 ACBAA Colorado area
The quiet conditions in Alaska which have persisted since the M 7.2 in Honshu, Japan of March 20 were interrupted today by an M 4.8 and aftershocks in the western Fox Islands, Aleutians. Today's event of M 4.8 is the largest in western Fox Islands within about 200 km of this epicenter since an M 6.4 about 100 km to the east occurred on December 1, 2020. Forecast 132481 had expected today's activity was likely around March 25.
O: 26MAR2021 17:03:59 52.9N 169.8W mb=3.7 EMSC FOX ISLANDS, ALEUTIAN ISLANDS
O: 26MAR2021 17:27:51 52.9N 169.8W ml=3.0 EMSC FOX ISLANDS, ALEUTIAN ISLANDS
O: 26MAR2021 20:47:12 52.9N 169.8W ML=3.5 EMSC FOX ISLANDS, ALEUTIAN ISLANDS
O: 26MAR2021 14:41:20 52.7N 169.8W mb=4.8 EMSC FOX ISLANDS, ALEUTIAN ISLANDS
P: 25MAR2021 132481 52.4N 170.7W 3.5-5.1 AAAAA Andreanoff Isls, Aleutians
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 26MAR2021 19:02:08 27.6N 92.7E mb=5.0 EMSC ARUNACHAL PRADESH, INDIA
P: 22MAR2021 132365 27.0N 92.0E 4.0-5.5 BAAAA Myanmar
NEIC reported this earthquake of M 5.0 in Arunachal Pradesh, India was felt with intensity IV in the area(s) of Arunachal Pradesh, India in Itanagar, and in Assam in Lakhimpur, Numaligarh Refinery Township, Jorhat, Gauhati and II-III in Tawang, Golaghat, North Guwahati, Dhemay, and Tihu.
O: 26MAR2021 23:08:30 40.8N 83.3E mb=4.6 EMSC SOUTHERN XINJIANG, CHINA
P: 22MAR2021 132447 41.0N 83.0E 4.0-5.6 BAAAA Kirgizstan/Xinjiang
O: 26MAR2021 10:37:17 36.6N 71.0E mb=4.5 EMSC HINDU KUSH REGION, AFGHANISTAN
P: 26MAR2021 132388 37.0N 70.0E 3.8-5.5 AAAAA Hindu Kush/Pakistan
O: 26MAR2021 18:23:39 55.8N 163.6E mb=4.7 EMSC OFF EAST COAST OF KAMCHATKA
P: 24MAR2021 132487 56.0N 165.0E 4.0-5.7 AAAAA Komandorsky Isl
O: 26MAR2021 20:29:33 55.9N 162.8E mb=4.5 EMSC NEAR EAST COAST OF KAMCHATKA
P: 24MAR2021 132484 54.0N 163.0E 4.0-5.5 ABAAA E. of Kamchatka
INDONESIA AND PHILIPPINES
O: 26MAR2021 16:29:29 0.8N 125.7E ML=4.3 EMSC MOLUCCA SEA
P: 24MAR2021 132309 2.0N 126.0E 4.0-5.6 ABAAA Mindanao, Philippines
O: 26MAR2021 16:33:52 1.0S 120.7E ML=4.3 EMSC SULAWESI, INDONESIA
P: 28MAR2021 132300 0.0N 120.0E 4.0-5.4 AAAAA Celebes Sea
P: 31MAR2021 132329 1.0S 122.0E 4.0-5.4 BAAAA Sulawesi area
O: 26MAR2021 08:59:34 1.7S 139.4E ML=4.4 EMSC NEAR N COAST OF PAPUA, INDONES
O: 26MAR2021 11:40:46 2.1S 139.1E mb=4.6 EMSC NEAR N COAST OF PAPUA, INDONES
P: 26MAR2021 132332 3.0S 139.0E 4.0-5.6 AAAAA West Irian, PNG
O: 26MAR2021 16:42:21 2.6N 128.5E ML=4.1 EMSC HALMAHERA, INDONESIA
P: 28MAR2021 132307 2.0N 127.0E 4.0-5.6 AABAA Halmahera
O: 26MAR2021 10:49:43 4.0S 134.1E ML=4.0 EMSC PAPUA, INDONESIA
P: 24MAR2021 132331 4.0S 134.0E 4.0-5.4 AAAAA West Irian, PNG
O: 26MAR2021 15:46:08 7.2S 155.4E mb=4.9 EMSC SOLOMON ISLANDS
P: 26MAR2021 132320 6.0S 154.0E 4.0-5.6 ABBAA New Britain
O: 26MAR2021 22:45:51 8.0N 126.3E mb=4.3 EMSC MINDANAO, PHILIPPINES
P: 29MAR2021 132308 7.0N 127.0E 4.0-5.6 BAAAA Halmahera
O: 26MAR2021 13:36:06 11.7S 118.5E ML=4.0 EMSC SOUTH OF SUMBAWA, INDONESIA
P: 26MAR2021 132522 11.0S 116.0E 4.0-5.4 AACAA So. of Indonesia
No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.
CENTRAL AND SOUTH AMERICA
O: 27MAR2021 20:17 19.5S 69.9W mb=4.5 GUC Tarapaca at Alto Hospicio, Hua
P: 29MAR2021 132538 20.0S 70.0W 4.0-5.4 AAAAA So. Peru/Bolivia
GUC reported thise earthquake was felt with intensity IV in Tarapaca at Alto Hospicio, Huara, Iquique, Mamina, Pisagua; III in La Tirana, Pozo Almonte and II in Camina, Pica; in Arica with III in Arica and Cuya and II in Codpa, Chile.
O: 26MAR2021 20:06:36 1.9S 77.4W mb=4.4 EMSC ECUADOR
P: 25MAR2021 132316 1.0S 77.0W 4.0-5.6 AAAAA Ecuador
O: 26MAR2021 15:57:43 2.7N 59.6W mb=4.7 EMSC GUYANA
O: 26MAR2021 11:21:27 8.6S 73.5W mb=4.2 EMSC PERU-BRAZIL BORDER REGION
P: 31MAR2021 132314 9.0S 75.0W 3.5-5.0 BABAA Brazil
O: 26MAR2021 14:07:53 15.1N 94.6W ML=4.0 EMSC OFF COAST OF OAXACA, MEXICO
O: 26MAR2021 13:11:26 15.2N 94.7W ML=4.2 EMSC OFF COAST OF OAXACA, MEXICO
P: 27MAR2021 132339 17.0N 94.0W 3.5-5.6 ABAAA Chiapas, Mexico
O: 27MAR2021 02:17:45 15.4N 61.1W ML=4.3 EMSC DOMINICA REGION, LEEWARD ISLAN
P: 24MAR2021 132344 18.0N 64.0W 3.0-5.2 BCCAA Leeward Islands
O: 26MAR2021 09:55:49 15.8N 95.0W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO
O: 26MAR2021 23:52:38 15.8N 95.6W ML=4.1 EMSC OFFSHORE OAXACA, MEXICO
O: 27MAR2021 05:30:27 15.6N 95.8W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO
P: 30MAR2021 132353 15.0N 97.0W 3.5-5.1 BAAAA Oaxaca, Mexico
O: 26MAR2021 13:19:37 16.8N 60.7W mb=4.9 EMSC GUADELOUPE REGION, LEEWARD ISL
P: 24MAR2021 132344 18.0N 64.0W 3.0-5.2 ABCAA Leeward Islands
O: 27MAR2021 06:58:59 17.3N 101.7W ML=4.0 EMSC OFFSHORE GUERRERO, MEXICO
P: 30MAR2021 132347 17.0N 102.0W 3.5-5.2 BAAAA Michoacan, Mexico
O: 27MAR2021 01:07:24 19.2N 66.5W Md=3.3 EMSC PUERTO RICO REGION
O: 26MAR2021 13:46:37 19.2N 66.6W Md=3.3 EMSC PUERTO RICO REGION
P: 27MAR2021 132354 19.0N 67.0W 3.4-5.3 AAAAA Puerto Rico
O: 26MAR2021 08:06:15 23.3S 69.2W ML=4.0 EMSC ANTOFAGASTA, CHILE
P: 29MAR2021 132529 24.0S 68.0W 4.0-5.9 BAAAA Argentina
O: 26MAR2021 17:09:55 26.3N 111.4W mb=4.4 EMSC BAJA CALIFORNIA SUR, MEXICO
P: 31MAR2021 132359 28.0N 112.0W 3.5-5.1 BBAAA Gulf of California
NEIC reported this earthquake of M 4.4 in Loreto Baja California was felt with intensity II-III in the area(s) of Loreto Baja California.
O: 26MAR2021 09:08:35 32.1S 71.7W ML=4.1 EMSC OFFSHORE COQUIMBO, CHILE
P: 23MAR2021 132541 33.0S 72.0W 4.0-5.8 BAAAA Central Chile
P: 29MAR2021 132541 32.0S 70.0W 4.0-5.6 AABAA Central Chile
NEIC reported this earthquake of M 4.0 in Coquimbo, Chile was felt with intensity II-III in the area(s) of Coquimbo, Chile at Vina del Mar, Valparaiso.
AFRICA AND EUROPE
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 26MAR2021 11:21:18 18.2S 178.2W mb=4.4 EMSC FIJI REGION
O: 26MAR2021 08:13:10 18.2S 178.0W mb=4.5 EMSC FIJI REGION
P: 27MAR2021 132525 19.0S 178.0W 4.0-5.8 AAAAA Tonga Islands
OCEAN RIDGES
O: 26MAR2021 22:59:36 50.2S 112.7E mb=5.1 EMSC SOUTHEAST INDIAN RIDGE
O: 26MAR2021 08:29:41 50.5S 112.8E mb=5.0 EMSC SOUTHEAST INDIAN RIDGE
O: 27MAR2021 06:59:58 71.4N 4.4W mb=5.2 EMSC JAN MAYEN ISLAND REGION
O: 26MAR2021 21:03:28 62.6S 161.6W Mw=5.7 EMSC PACIFIC-ANTARCTIC RIDGE
O: 26MAR2021 21:12:12 62.3S 160.0W Mw=5.7 EMSC PACIFIC-ANTARCTIC RIDGE
ZEALANDIA AND AUSTRALIA REGION
O: 26MAR2021 15:50:08 32.6S 179.5E ML=3.7 EMSC SOUTH OF KERMADEC ISLANDS
P: 25MAR2021 132547 35.0S 179.0E 3.0-4.5 ACAAA North Island, N.Z.
O: 27MAR2021 04:03:41 37.4S 180.0E ML=3.7 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 27MAR2021 05:01:49 37.4S 179.9E ML=3.5 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 27MAR2021 02:16:09 37.5S 180.0E ML=3.8 EMSC OFF E. COAST OF N. ISLAND, N.Z.
O: 27MAR2021 03:59:03 37.3S 179.9E mb=4.5 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 26MAR2021 132549 38.0S 178.0E 3.0-4.4 AABAA North Island, N.Z.
NEIC reported this earthquake of M 4.5 off northern North Island, New Zealand was felt with intensity II-III in the area(s) of off northern North Island, New Zealand in Ruatoria, Gisborne.
O: 27MAR2021 03:32:16 37.5S 180.0W ML=3.8 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 25MAR2021 132545 37.0S 180.0W 3.5-5.1 AAAAA E. of North Islands N.Z.
O: 26MAR2021 20:00:31 38.7S 174.5E ML=3.5 EMSC NORTH ISLAND OF NEW ZEALAND
O: 26MAR2021 05:45:11 38.8S 174.6E MS=3.2 GEONET Felt with moderate intensity
P: 27MAR2021 132554 40.0S 174.0E 3.0-4.6 ABAAA North Island, N.Z.
GEONET reported this earthquake was felt with moderate intensity in southeastern North Island. More than 17 people reported feeling this earthquake. Light to moderate intensity was reported throughout much of southern and eastern North Island and northern South Island. 13 reports of weak intensity; 4 of light intensity; 0 with moderate; 0 with strong shaking and 0 with severe and 0 with extreme intensity.
NEIC reported this earthquake of M 3.3 west of North Island, New Zealand was felt with intensity II-III in the area(s) in western North Island, New Zealand at Waitara, New Plymouth, Taranaki and in Ohura Manawatu-Wanganui.
JAPAN AND KURIL ISLANDS
O: 26MAR2021 22:02:16 26.1N 125.0E Mw=5.9 EMSC NORTHEAST OF TAIWAN
P: 28MAR2021 132370 24.0N 125.0E 4.0-5.4 ABAAA Taiwan
P: 30MAR2021 132367 26.0N 128.0E 4.0-5.4 BABAA Ryukyu Islands
O: 26MAR2021 22:02:11 25.8N 125.5E ML=6.8 TAI Hualien, Taiwan
P: 28MAR2021 132370 24.0N 125.0E 4.0-5.4 ABAAA Taiwan
P: 30MAR2021 132367 26.0N 128.0E 4.0-5.4 AABAA Ryukyu Islands
CWB reported this earthquake was felt with intensity II in Hualien and Taichung, and I in Yilan, Nantou, Taichung, Kaohsiung, Changhua, Yunlin, Taipei, Chiayi, Tainan and Keelung, Taiwan.
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 26MAR2021 08:27:47 31.5N 115.7W Ml=3.0 EMSC BAJA CALIFORNIA, MEXICO
P: 26MAR2021 132410 31.9N 116.3W 2.5-4.4 AAAAA So. California
O: 26MAR2021 19:12:58 36.3N 118.3W Ml=2.1 EMSC CENTRAL CALIFORNIA
P: 31MAR2021 132378 38.6N 118.6W 2.5-4.6 BAAAA California/Nevada area
O: 26MAR2021 08:15:32 37.7N 119.5W Md=2.1 EMSC CENTRAL CALIFORNIA
P: 26MAR2021 132377 37.4N 118.6W 2.5-4.7 AAAAA California/Nevada area
O: 26MAR2021 13:40:32 38.2N 117.8W ml=2.0 EMSC NEVADA
O: 26MAR2021 13:34:20 38.2N 117.8W ML=3.3 EMSC NEVADA
P: 28MAR2021 132377 37.8N 118.2W 2.5-4.8 AAAAA California/Nevada area
O: 26MAR2021 07:21:06 38.8N 122.8W Md=2.3 EMSC NORTHERN CALIFORNIA
P: 24MAR2021 132383 38.8N 122.7W 2.5-4.5 AAAAA Central California
O: 26MAR2021 22:14:31 39.0N 123.1W ML=2.5 EMSC NORTHERN CALIFORNIA
O: 26MAR2021 22:12:04 39.0N 123.0W ML=2.4 EMSC NORTHERN CALIFORNIA
P: 29MAR2021 132384 39.8N 123.5W 2.5-4.6 BAAAA Central California
NEIC reported this earthquake of M 2.8 in Northern California was felt with intensity II-III in the area(s) of Northern California in Lakeport, Hopland, and Ukiah.
O: 26MAR2021 17:15:00 49.5N 120.5W Ml=2.2 EMSC BRITISH COLUMBIA, CANADA
P: 26MAR2021 132473 47.5N 121.8W 2.0-4.0 ABAAA Washington state, U.S.
ALASKA
O: 26MAR2021 17:03:59 52.9N 169.8W mb=3.7 EMSC FOX ISLANDS, ALEUTIAN ISLANDS
O: 26MAR2021 17:27:51 52.9N 169.8W ml=3.0 EMSC FOX ISLANDS, ALEUTIAN ISLANDS
O: 26MAR2021 20:47:12 52.9N 169.8W ML=3.5 EMSC FOX ISLANDS, ALEUTIAN ISLANDS
O: 26MAR2021 14:41:20 52.7N 169.8W mb=4.8 EMSC FOX ISLANDS, ALEUTIAN ISLANDS
P: 25MAR2021 132481 52.4N 170.7W 3.5-5.1 AAAAA Andreanoff Isls, Aleutians
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 26MAR2021 10:23:29 48.8N 128.9W MB=3.4 ECAN Port Alice, BC
P: 26MAR2021 132472 49.9N 130.2W 2.8-5.3 ABAAA Vancouver Island area
O: 26MAR2021 05:19:41 60.3N 140.2W MB=3.2 ECAN Yakutat, AK
P: 27MAR2021 132498 60.0N 138.0W 3.2-5.4 AAAAA Central Alaska
ROCKY MOUNTAINS REGION
O: 26MAR2021 14:52:24 43.3N 103.7W ML=3.4 EMSC SOUTH DAKOTA
P: 24MAR2021 132441 40.6N 106.6W 2.0-3.9 ACBAA Colorado area
O: 26MAR2021 17:07:40 44.3N 114.8W Ml=2.0 EMSC SOUTHERN IDAHO
O: 26MAR2021 23:09:23 44.3N 115.2W Ml=2.1 EMSC SOUTHERN IDAHO
O: 26MAR2021 12:30:16 44.3N 115.2W Ml=2.0 EMSC SOUTHERN IDAHO
P: 24MAR2021 132451 44.5N 115.2W 2.0-4.3 AAAAA Montana/Idaho
P: 27MAR2021 132451 44.5N 114.7W 2.0-4.3 AAAAA Montana/Idaho
O: 27MAR2021 03:33:22 44.3N 116.2W Ml=2.2 EMSC SOUTHERN IDAHO
P: 24MAR2021 132451 44.5N 115.2W 2.0-4.3 BAAAA Montana/Idaho
O: 26MAR2021 22:01:29 31.7N 104.4W ML=3.4 EMSC WESTERN TEXAS
O: 26MAR2021 07:46:36 32.7N 100.7W mb=2.6 EMSC WESTERN TEXAS
P: 25MAR2021 132409 32.2N 104.1W 2.0-4.1 AAAAA SW U.S.A
EASTERN U.S./CANADA
O: 26MAR2021 16:31:25 35.4N 97.9W ML=2.9 EMSC OKLAHOMA
O: 27MAR2021 00:13:08 35.4N 97.9W ML=2.2 EMSC OKLAHOMA
O: 26MAR2021 12:57:36 35.4N 97.9W ML=2.4 EMSC OKLAHOMA
P: 26MAR2021 132427 37.0N 98.0W 2.0-4.2 ABAAA Southern Plains
NEIC reported this earthquake of M 2.5 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma with IV in Minco and II in Union City.
O: 26MAR2021 08:38:29 49.7N 91.2W MB=2.1 ECAN Sioux Lookout, ON
O: 26MAR2021 08:10:07 49.7N 91.2W MB=1.5 ECAN Sioux Lookout, ON
O: 26MAR2021 07:49:02 49.7N 91.2W MB=2.0 ECAN Sioux Lookout, ON
O: 25MAR2021 12:12:51 47.0N 67.0W MB=2.1 ECAN Plaster Rock, NB
P: 27MAR2021 132448 47.0N 69.0W 2.0-4.0 AABAA Maine
O: 25MAR2021 08:20:14 50.7N 63.4W MB=1.4 ECAN Havre-Saint-Pierre, QC
P: 31MAR2021 132442 49.0N 66.0W 2.0-3.9 CBBAA E. of Maine
HAWAII
No earthquakes of M>=3 were located in Hawaii.