VOLCANIC EPISODES CONTINUE; REDUCE GLOBAL AND REGIONAL SEISMICITY

 

EARTHQUAKE SUMMARY FOR  APRIL 11, 2021

 

Active volcanic eruptions continued today in La Soufriere, St. Vincent, southern Iceland and Etna in Sicily, Italy. The eruption in La Soufriere has continued for the third day covering the island of St. Vincent with heavy ash and damaging many buildings there due to its weight. Nearly 100,000 have been evacuated as the volcano continues to rumble. This eruption is expected to continue for some time. Power was out intermittently in the area in the area due to the eruption. The eruption of Mt. Etna in Sicily also entered its third week. This eruption has included copious lava flows and ash and volcanic stones falling. The airport was briefly closed. The eruption in Iceland also continued today where a fourth fissure opened up at Fagradalsfjall near Reykjavik. This eruption is now nearly three weeks old. Other volcanic eruptions were occurring in Pacaya in Guatemala, Fuego in Guatemala, Karymsky in Kamchatka, Popocatepetl north of Mexico City and Dukono in Halmahera and in Suwanose-Jima, Ryukyu Islands. The eruptions in the Ryukyu Island, Kamchatka and Java have been accompanied by large earthquakes. Other eruptions on April 11 occurred in Japan at Ebeko in Paramushir Island and in Sakurajima, in Kyushu, Japan and in Ecuador. Volcanic episodes such as this can reduce regional and global seismicity as volcanoes act as a pressure release for the earth's surface and reducing pressure reduces global seismicity.

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in the region of the Alaska Peninsula. It appears to be an aftershock of the M 7.6 event of October 19, 2020. Forecast 132747 had expected this event was likely around April 8. 

 

O: 11APR2021 07:10:50  54.4N  159.7W ml=4.0  EMSC   SOUTH OF ALASKA              

P:  8APR2021 132747    54.8N  158.7W 3.5-4.9 BAAAA  Alaska Peninsula           

 

An unusual earthquake of M 3.0 was also felt in Tamil Nadu, Southern India today. NCS of India reported this earthquake was felt with intensity II in the epicentral region. The last earthquake within about 300 km of this epicenter in India reported by NEIC was an M 5.1-5.2 on September 25, 2001, the only such earthquake in the area in the past 30 years at least.  Forecast 132602 had expected regional activity to the northwest was likely around April 8. This earthquake is at 105 degrees from the M 7.3 off North Island, New Zealand of March 4 and may have been promoted by energy from that source.

 

O: 11APR2021 15:11:27  12.1N   79.1E ML=3.0  EMSC   TAMIL NADU, INDIA            

P:  8APR2021 132602    17.0N   74.0E 3.5-5.1 BCCAA  Arabian Sea                

 

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: 11APR2021 07:23:59  23.3N   81.7E ML=3.9  EMSC   MADHYA PRADESH, INDIA        

P: 11APR2021 132915    27.0N   88.0E 3.5-5.4 ACCAA  Nepal                       

 

NCS of India reported this earthquake was felt with intensity II in the epicentral region.

 

O: 11APR2021 15:11:27  12.1N   79.1E ML=3.0  EMSC   TAMIL NADU, INDIA            

P:  8APR2021 132602    17.0N   74.0E 3.5-5.1 BCCAA  Arabian Sea                

 

NCS of India reported this earthquake was felt with intensity II in the epicentral region.

 

O: 11APR2021 16:41:41  24.7N  122.4E mb=4.3  EMSC   TAIWAN REGION                

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

P: 13APR2021 132920    24.0N  123.0E 4.0-5.4 AAAAA  Taiwan                     

 

O: 11APR2021 17:26:56  29.0N   57.1E ML=4.0  EMSC   SOUTHERN IRAN                

P:  7APR2021 132642    27.0N   56.0E 3.5-5.2 BBAAA  So. Iran/Persian Gulf      

 

O: 11APR2021 21:47:29  29.6N   89.6E ML=3.8  EMSC   WESTERN XIZANG               

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

 

O: 11APR2021 13:48:52  52.3N  158.5E mb=4.6  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 14APR2021 133025    51.0N  156.0E 4.0-6.0 BBBAA  Kamchatka                  

 

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

 

INDONESIA AND PHILIPPINES

 

O: 12APR2021 04:47:32   0.1N  123.6E ML=4.1  EMSC   MINAHASA, SULAWESI, INDONESIA

P: 11APR2021 132848     1.0N  124.0E 4.0-5.6 AAAAA  Mindanao, Philippines      

 

O: 11APR2021 20:03:26   0.2S  123.1E ML=4.1  EMSC   SULAWESI, INDONESIA          

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

 

O: 12APR2021 02:26:25   2.8N  128.6E mb=5.2  EMSC   HALMAHERA, INDONESIA         

O: 12APR2021 03:40:29   3.2N  126.7E ML=4.0  EMSC   KEPULAUAN TALAUD, INDONESIA  

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

 

O: 11APR2021 19:03:37   5.0S  101.1E ML=4.6  EMSC   SOUTHWEST OF SUMATRA, INDONESI

P: 13APR2021 132871     6.0S  102.0E 4.0-5.6 AAAAA  So. of Sumatera            

 

O: 12APR2021 01:52:27   5.2S  104.9E mb=4.9  EMSC   SOUTHERN SUMATRA, INDONESIA  

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

P: 14APR2021 132870     6.0S  105.0E 4.0-5.5 AAAAA  So. of Java                

 

O: 11APR2021 07:55:26   6.2S  130.5E ML=4.3  EMSC   BANDA SEA

O: 11APR2021 21:08:18   6.1S  130.2E ML=4.1  EMSC   BANDA SEA                    

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

 

O: 11APR2021 10:44:46   6.2S  104.7E mb=4.9  EMSC   SUNDA STRAIT, INDONESIA      

O: 12APR2021 01:46:28   6.7S  105.0E ML=4.1  EMSC   SUNDA STRAIT, INDONESIA

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

 

O: 11APR2021 12:35:58   6.7S  154.9E ML=4.2  EMSC   BOUGAINVILLE REGION, P.N.G.  

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

 

O: 11APR2021 18:58:01  17.9N  147.1E Mw=5.2  EMSC   MARIANA ISLANDS REGION       

O: 11APR2021 17:54:33  18.0N  146.9E mb=4.7  EMSC   PAGAN REG., N. MARIANA ISLANDS

O: 11APR2021 18:08:48  18.0N  147.0E mb=4.7  EMSC   PAGAN REG., N. MARIANA ISLANDS

P:  7APR2021 132618    19.0N  145.0E 4.0-5.4 BABAA  No. Marianas               

 

 

CENTRAL AND SOUTH AMERICA

 

O: 11APR2021 18:19:16  15.0N   92.6W mb=4.5  EMSC   CHIAPAS, MEXICO

O: 11APR2021 07:03:10  15.2N   94.6W ML=4.0  EMSC   OFF COAST OF OAXACA, MEXICO

O: 11APR2021 18:12:33  14.8N   93.7W mb=4.4  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 13APR2021 132880    15.0N   93.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 12APR2021 05:50:58  15.4N   96.8W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO       

P: 12APR2021 132897    15.0N   96.0W 3.5-5.1 AAAAA  Oaxaca, Mexico             

 

O: 11APR2021 09:58:41  16.3N   98.3W ML=4.2  EMSC   OAXACA, MEXICO               

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

 

O: 11APR2021 16:20:12  18.8N  102.9W mb=4.7  EMSC   MICHOACAN, MEXICO            

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

 

NEIC reported this earthquake of M  4.7 in Michoacan, Mexico was felt with intensity II-III in the area(s) of Manzanilo, Colima, Mexico.

 

O: 11APR2021 14:22:48  20.3N   70.8W ML=3.1  EMSC   DOMINICAN REPUBLIC REGION    

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

 

O: 11APR2021 15:52:23  21.2S   68.0W mb=4.5  EMSC   POTOSI, BOLIVIA              

P: 13APR2021 133072    20.0S   69.0W 4.0-5.4 ABAAA  So. Peru/Bolivia           

 

O: 11APR2021 14:52:31  24.9S   68.2W mb=4.6  EMSC   SALTA, ARGENTINA             

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

 

O: 11APR2021 14:42:04  31.7S   69.7W mb=4.9  EMSC   SAN JUAN, ARGENTINA          

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

 

 

AFRICA AND EUROPE

 

O: 12APR2021 03:44:23  33.8N   15.9E mb=4.2  EMSC   CENTRAL MEDITERRANEAN SEA    

P:  9APR2021 132671    38.0N   14.0E 3.0-4.8 BCBAA  Mediterranean/Sicily       

 

O: 11APR2021 14:06:36  40.8N   34.8E mb=4.0  EMSC   CENTRAL TURKEY               

P:  9APR2021 132730    41.0N   33.0E 3.5-5.1 AAAAA  No. Turkey/Black Sea       

 

O: 11APR2021 07:55:06  37.0N    5.3E mb=3.4  EMSC   NORTHERN ALGERIA             

P: 12APR2021 132977    37.0N    5.0E 3.0-4.4 AAAAA  Western Mediterranean      

 

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

 

SOUTHWEST PACIFIC

 

O: 11APR2021 23:14:01  17.9S  178.5W mb=4.4  EMSC   FIJI REGION                  

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

 

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

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 12APR2021 05:26:11  30.6S  177.9W Mw=5.1  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 11APR2021 14:40:07  29.9S  176.9W mb=5.0  EMSC   KERMADEC ISLANDS REGION      

P: 12APR2021 133080    30.0S  177.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

O: 11APR2021 16:06:13  39.8S  175.2E ML=3.7  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 11APR2021 133083    39.0S  176.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

O: 12APR2021 04:42:48  44.8S  167.3E ML=3.6  EMSC   SOUTH ISLAND OF NEW ZEALAND  

P:  9APR2021 132827    46.0S  167.0E 3.0-4.9 BBAAA  Southern S. Isl. N.Z.      

 

JAPAN AND KURIL ISLANDS

 

O: 11APR2021 12:00:25  29.3N  129.4E mb=4.8  EMSC   RYUKYU ISLANDS, JAPAN

O: 11APR2021 12:14:22  29.4N  129.5E mb=4.7  EMSC   RYUKYU ISLANDS, JAPAN

O: 11APR2021 10:01:18  29.3N  129.4E mb=4.5  EMSC   RYUKYU ISLANDS, JAPAN        

P: 12APR2021 132911    29.0N  129.0E 4.0-5.5 AAAAA  Kyushu Japan               

 

O: 12APR2021 03:08:36  22.7N  142.9E Mw=5.2  EMSC   VOLCANO ISLANDS, JAPAN REGION

P:  7APR2021 132646    23.0N  143.0E 4.0-5.4 BAAAA  Volcano Islands            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 11APR2021 14:03:56  31.4N  115.6W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO      

O: 11APR2021 13:24:08  32.0N  115.7W Ml=2.3  EMSC   BAJA CALIFORNIA, MEXICO      

P: 14APR2021 132956    32.9N  115.6W 2.5-4.5 BAAAA  So. California             

 

O: 11APR2021 08:29:00  36.0N  117.7W Ml=2.4  EMSC   CENTRAL CALIFORNIA

O: 11APR2021 14:56:34  36.0N  117.5W Ml=2.3  EMSC   CENTRAL CALIFORNIA

O: 11APR2021 09:45:36  35.8N  117.6W ML=2.9  EMSC   CENTRAL CALIFORNIA           

O: 11APR2021 09:45:36  35.8N  117.6W ML=3.1  ANSS   CENTRAL CALIFORNIA           

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

P: 12APR2021 132964    35.9N  117.7W 2.5-5.0 AAAAA  So. California             

 

NEIC reported this earthquake of M 3.1 in Central California was felt with intensity II-III in the area(s) of Central California at Ridgecrest, Inyokern.

 

O: 12APR2021 01:53:40  37.4N  117.9W ml=2.3  EMSC   CENTRAL CALIFORNIA           

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

 

O: 11APR2021 09:02:37  37.6N  121.7W Md=2.3  EMSC   NORTHERN CALIFORNIA

O: 12APR2021 03:47:05  37.6N  122.5W Md=2.2  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 11APR2021 21:10:38  37.5N  121.8W Md=2.1  EMSC   SAN FRANCISCO BAY AREA, CALIF.

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

P: 13APR2021 132933    37.4N  121.8W 2.5-4.6 AAAAA  Central California         

 

O: 11APR2021 07:49:35  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA           

O: 11APR2021 16:55:58  38.8N  122.8W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 11APR2021 22:03:29  38.8N  122.8W Md=2.6  EMSC   NORTHERN CALIFORNIA

O: 11APR2021 22:16:21  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 11APR2021 22:57:31  38.8N  122.8W Md=2.5  EMSC   NORTHERN CALIFORNIA

P: 13APR2021 132934    38.7N  122.7W 2.5-4.4 AAAAA  Central California         

 

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

 

O: 12APR2021 03:30:06  40.6N  121.6W Md=2.4  EMSC   LASSEN PEAK AREA, CALIFORNIA 

P: 13APR2021 133002    40.4N  122.2W 2.5-4.6 AAAAA  Northern California        

 

ALASKA

 

O: 11APR2021 07:10:50  54.4N  159.7W ml=4.0  EMSC   SOUTH OF ALASKA              

P:  8APR2021 132747    54.8N  158.7W 3.5-4.9 BAAAA  Alaska Peninsula           

 

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: 12APR2021 06:20:22  31.7N  104.6W ML=3.1  EMSC   WESTERN TEXAS                

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

 

 

O: 11APR2021 09:41:58  44.3N  115.2W Ml=2.1  EMSC   SOUTHERN IDAHO               

P: 12APR2021 132992    44.5N  115.2W 2.0-4.1 AAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 11APR2021 16:44:16  35.2N   95.4W ML=2.3  EMSC   OKLAHOMA

O: 12APR2021 01:04:52  35.1N   95.4W ML=2.2  EMSC   OKLAHOMA                     

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

 

HAWAII

 

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

 

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.