UNUSUAL, MODERATE QUAKE SHAKES YELLOWSTONE NATIONAL PARK, WYOMING

 

EARTHQUAKE SUMMARY FOR MAY 11, 2022

 

An unusually large M 4.4 shook the Yellowstone National Park area of Wyoming today. NEIC reported maximum shaking of V in Powell, Wyoming with II-III in Cody, Yellowstone National Park, and in Montana at Gardiner, Red Lodge, Fray, Nye, Livingston and Columbus. While light earthquakes are common in the Yellowstone area, moderate quakes of M>=4 have been relatively rare in recent years. The last earthquake in Yellowstone of M>=4.2 was an M 4.4 on June 16, 2017 but the last of M>4.4 was an M 4.8 on March 30, 2013. Forecast 143576 had expected today's event was likely within about 50 km of this epicenter around May 15.

 

O: 11MAY2022 13:32:04  44.6N  110.1W mb=4.4  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 15MAY2022 143576    44.2N  110.3W 2.0-4.2 BAAAA  Yellowstone/Wyoming        

 

The strongest earthquake in the world today was an M 5.2 in Vanuatu. An M 4.8 followed later in the day. This may be an aftershock of an M 6.0 that hit this area on March 23, 2022. Forecast 143379 had expected this activity was likely around May 9.

 

O: 12MAY2022 05:34:23  14.7S  167.9E mb=4.8  EMSC   VANUATU                      

O: 11MAY2022 14:20:14  15.2S  167.5E Mw=5.2  EMSC   VANUATU

P:  9MAY2022 143379    14.0S  168.0E 4.0-5.4 BAAAA  Vanuatu Islands            

 

 

 

 

 

 

STRONG EARTHQUAKE SHAKES ARGENTINA, BOLIVIA AND CHILE AFTER X-CLASS SOLAR FLARE

 

EARTHQUAKE SUMMARY FOR MAY 10, 2022

 

The strongest earthquake in the world today was an M 6.8 in Jujuy, Argentina. This is the largest earthquake in the world since an M 7.0 in the Loyalty Islands 1.5 months ago on March 31, 2022. It occurred at an intermediate depth and was felt with moderate intensity over a large area. NEIC reported maximum intensity V in Salta, Argentina and IV in Jujuy, Argentina and in Chile in Tarapaca, Antofagasta, Atacama, with lesser shaking in Bolivia. This epicenter is near the antipode of the M 6.3 in Taiwan which occurred on May 8 and may have been promoted by strong antipodal focusing from that source. The solar eclipse of April 30 was visible in this area and this summary had anticipated a strong earthquake was possible in this area of South America following that alignment as:

 

"The new moon arrived on April 30, 2022 at 20:28 UT. Longitudes which were at local solar noon at the time of this new moon are near 125 West while those at local solar midnight are near 55 East. In the west these include areas of western U.S. and Canada and the East Pacific Rise and in the east areas of Iran, the Caspian Sea to Turkey. These are the areas most likely to see tidal triggering during the next week but tidal triggering is possible in other areas as well and would most likely include seismicity near local solar midnight or noon. This is a partial solar eclipse visible in the Southeast Pacific and Southern South America and is most complete in Chile and Argentina where a strong earthquake may occur in conjunction with this eclipse. It is the first solar eclipse since December 21, 2021." (April 28-May 2, 2022)

 

Today's activity may also have been promoted by Solar Flare Effects (SFE) from

an X-class flare that occurred several hours earlier. SWPC parameters for this flare which occurred near local solar noon in Argentina follow:

 

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

 

4790       1350   1355      1359   X1.5      (May 10, 2022)   3.1E-02  

 

Today's M 6.8 in Argentina is the strongest earthquake within about 200 km  of this epicenter since an M 7.2 near this epicenter on May 12, 2000, 22  years ago. An M 7.0 also occurred about 100 km north of this on May 24, 1993.  Forecast 143381 had expected today's event within about 100 km in Argentina was likely to occur around May 6.

 

O: 10MAY2022 23:06:28  23.6S   66.7W Mw=6.8  EMSC   JUJUY, ARGENTINA             

P:  6MAY2022 143381    24.0S   66.0W 4.0-5.5 BAAAA  Argentina                  

 

An M 5.7 also occurred in central Vanuatu near the time of flare 4790. Forecast 143380 had expected this event in early May.

 

O: 10MAY2022 13:18:11  17.2S  167.8E Mw=5.7  EMSC   VANUATU                      

P:  3MAY2022 143380    18.0S  168.0E 4.0-5.4 CAAAA  Vanuatu Islands            

 

A deep focus earthquake of M 5.4 occurred earlier in the day southeast of the quake in Jujuy. NEIC reported it was Felt in Buenos Aires, Argentina with intensity I.

 

O: 10MAY2022 08:42:06  27.2S   63.4W Mw=5.4  EMSC   SANTIAGO DEL ESTERO, ARGENTINA

P:  8MAY2022 143381    23.0S   64.0W 4.0-5.8 ACAAA  Argentina                  

 

Other moderately large earthquake occurred today as well. An M 5.4 in the South Sandwich Islands may also have been promoted by SFE from the flare 4790. It was preceded by an M 4.8 foreshock. Forecast 143412 had expected today's activity in the South Sandwich Islands was likely around May 8.

 

O: 10MAY2022 07:45:52  55.8S   27.2W mb=4.8  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 10MAY2022 23:18:46  55.4S   28.2W mb=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  8MAY2022 143412    56.0S   26.0W 4.0-5.8 AABAA  So. Sandwich Islands       

 

STRONG QUAKE IN BISMARCK SEA, PAPUA NEW GUINEA

 

EARTHQUAKE SUMMARY FOR MAY  9, 2022

 

The strongest earthquake in the world today was an M 6.3 in the Bismarck Sea, Papua New Guinea. NEIC reported it was felt with intensity VII in Madang, Papua and II in Lorengau Manus, Papua New Guinea. This continues enhanced regional seismicity in this area which has included an M 6.0 on April 28, 2022. At the time this summary noted in this regard:

 

"The strongest earthquake in the world today was an M 6.0 in Papua New Guinea. It was not reported felt in this area. This epicenter is located near the geomagnetic equator and may have been promoted by the geomagnetic storm currently in progress as noted in this and previous summaries:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14. High latitudes also saw active conditions with AP 21. This is sufficient to activate higher levels of seismicity at high latitudes and near the geomagnetic equator in the next several days." (April 28, 2022) 

 

The last earthquake with M>=6 within eastern New Guinea and within about 200 km of today's epicenter was an M  6.0 on July 21, 2021 and an M 6.1 on April 27, 2021, one year ago." (April 29, 2022)

 

The last event of M>=6.3 within about 200 km of this epicenter in the Bismarck Sea was an M 6.3 on February 7, 2021 and an M 6.3 on January 26, 2018.  Forecast 143169 had expected today's event within this are was likely about 150 km to the south was likely in early May.

 

O: 09MAY2022 22:33:06   3.4S  146.3E Mw=6.3  EMSC   BISMARCK SEA

O: 10MAY2022 00:02:33   3.5S  146.1E Mw=5.3  EMSC   BISMARCK SEA

O:  9MAY2022 22:54:44   3.1S  146.7E mb=4.7  EMSC   BISMARCK SEA                 

P:  6MAY2022 143169     5.0S  146.0E 4.0-5.6 BBAAA  New Ireland                

 

An M 4.1-4.5 earthquake shook areas of central France today. NEIC reported it was felt with intensity VI in Montlucon, Auvergne, France. This is a very unusual epicenter, the largest within about 100 km of this epicenter in at least 30 years. Recent earthquakes within about 200 km of this epicenter occurred as an M 4.8 about 250 km southeast of this on November 11, 2019 and an M 4.1 about 150 km northeast on December 3, 2016. An event of M 4.0 hit about 150 km to the west of this on July 26, 2010. Forecast 143287 had expected  enhanced seismicity in France south of today's epicenter was likely around May 8.

 

O:  9MAY2022 11:13:40  46.2N    2.8E ML=4.0  EMSC   FRANCE                       

P:  8MAY2022 143287    43.0N    1.0E 3.0-5.3 ACAAA  France                      

 

An M 5.2 also shook regions of Central Honshu, Japan today. NEIC reported intensity II-III in Kanagawa, Tokyo, Saitama Prefectures, Japan. This is the strongest earthquake in Central Honshu within about 150 km of this epicenter since an M 5.2 on January 15, 2021. These events are at an intermediate depth (300-400 km ) and are only slightly felt on the surface. The last event of larger magnitude in this area was an M 6.3 on July 27, 2019. Forecast 143254 had expected today's event in this region was likely around May 7.

 

O:  9MAY2022 08:33:07  34.5N  136.9E Mw=5.2  EMSC   WESTERN HONSHU, JAPAN        

P:  7MAY2022 143254    35.0N  136.0E 3.5-5.0 AAAAA  No. Honshu, Japan          

 

The strongest earthquake in the U.S. or Canada today was an M 4.1-4.3 in the Hecate Strait region of British Colombia, Canada. It was not reported felt in this region near Port Clements. The last earthquake of M>=4.1 within about 100 km of this epicenter was an M 4.6 on December 6, 2012 following an M 4.5 on November 30, 2012. Forecast 14332 had expected today's earthquake was likely in this area around May 7.

 

O: 09MAY2022 13:43:54  53.8N  131.8W ML=3.0  EMSC   HECATE STRAIT REGION, CANADA

O: 09MAY2022 13:02:05  53.7N  131.7W MB=4.3  ECAN of Port Clements, BC  

O:  9MAY2022 13:02:06  53.8N  131.7W Mw=4.1  EMSC   HECATE STRAIT REGION, CANADA 

P:  7MAY2022 143332    53.0N  131.0W 3.0-5.1 AAAAA  British Colombia           

 

Two light aftershocks continued recent seismicity in South Carolina today.

NEIC reported this earthquake of M 2.9 in South Carolina was felt with intensity II-III in the area(s) of South Carolina in Lugoff, Elgin, Columbia, Camden, Rampart and Ridgeway. This is an aftershock of the M 3.3 in South Carolina of May 9 which was also widely felt. Activity has been elevated in this region the past month. Forecast 143273 had expected this activity was likely within about 50 km of these epicenters in early May.

 

O: 09MAY2022 22:05:49  34.2N   80.7W ML=2.1  EMSC   SOUTH CAROLINA

O: 10MAY2022 03:55:40  34.2N   80.7W mb=2.9  EMSC   SOUTH CAROLINA               

P:  5MAY2022 143273    34.0N   80.0W 2.0-4.2 BAAAA  Southeast U.S.             

 

STRONG EARTHQUAKE SHAKES TAIWAN

 

EARTHQUAKE SUMMARY FOR MAY  9, 2022

 

The strongest earthquake in the world today was an M 6.1-6.4 in Taiwan. NEIC reported it was felt with intensity IV in Taipei, III in Taoyuan and Hsinchu Counties, Taiwan. CWB reported this earthquake was felt with intensity III in Yilan, Hualien, Taipei, Taitung, II in Nantou, Taichung, Taoyuan, Hsinchu, Miaoli, Yunlin, Changhua, Chiayi, Kaohsiung, Tainan, Pingtung, I in Keelung, Penghu, Lienchiang, and Kinmen Counties, Taiwan. This may be an aftershock of the M 6.7 in Taiwan of March 22 and the M 6.2 near this epicenter on January 3, 2022. Forecasts 143224 and 143223 had expected this activity in Taiwan was likely around May 6-8.

 

O:  9MAY2022 06:23:00  24.0N  122.5E Mw=6.3  EMSC   TAIWAN REGION                

O:  9MAY2022 06:23:03  24.0N  122.5E ML=6.1  TAI    Hualien, Taiwan              

P:  6MAY2022 143224    24.0N  124.0E 4.0-5.4 BABAA  Taiwan                     

P:  8MAY2022 143223    23.0N  121.0E 4.0-5.6 AABAA  Taiwan                      

 

A series of earthquakes also occurred in the Jan Mayen Islands region north of Iceland today. The strongest of these was an M 5.4. These appear to be aftershocks  of an M 5.7 which hit the area on February 14, 2022. At the time this summary noted in this regard.

 

"The strongest earthquake in the world today was an M 5.7 in the Jan Mayen Island area north of Scandinavia. It was not reported felt in this remote area. Aftershocks of M 4.3 and 4.7 followed within two hours of the mainshock. This is the strongest earthquake within about 200 km of this epicenter in the Jan Mayen area since an M 6.7 about 200 km northeast of this epicenter on November 9, 2018 and an M 6.8 in the same area on August 20, 2012." (February 14, 2022)

 

Forecast 143362 had expected today's activity within about 50 km was likely around May 6. Much of this activity occurred near local solar midnight and may have been promoted by high tidal stresses.

 

O: 08MAY2022 23:50:10  70.4N   15.2W mb=4.4  EMSC   JAN MAYEN ISLAND REGION

O: 08MAY2022 23:33:14  70.5N   15.1W mb=5.1  EMSC   JAN MAYEN ISLAND REGION

O: 08MAY2022 23:33:14  70.4N   15.2W mb=5.4  EMSC   JAN MAYEN ISLAND REGION

O: 08MAY2022 21:08:04  70.6N   15.4W ML=4.0  EMSC   JAN MAYEN ISLAND REGION

O:  8MAY2022 21:14:01  70.4N   15.2W Mw=5.1  EMSC   JAN MAYEN ISLAND REGION      

P:  6MAY2022 143362    71.0N   13.0W 3.5-5.3 AAAAA  Jan Mayen Isl. area        

 

A moderately strong M 4.9-5.5 shook the U.S. Virgin Islands today. NEIC reported it was felt with intensity IV in the U.S. Virgin Islands at Saint John and Saint Thomas and in Tortola, British Virgin Islands. Intensity III was also felt in Culebra, Vieques, Fajard, Celca, Puerto Rico and in the U. S. Virgin Islands at Christiansted, Frederiksted. The last earthquake in the Virgin Islands within about 150 km of this epicenter with equal or greater magnitude was an M 6.1 on October 11, 2008.

 

"The Virgin Islands is also a region which often shows strong triggering due to geomagnetic effect and this earthquake was likely triggered by the geomagnetic storm. The timing of the maximum effects of this geomagnetic storm is such as to coincide with the period of greatest danger of large earthquakes ...

 

The earthquake in the Virgin Islands of M 6.1 today was reported by NEIC to have been felt with maximum intensity V in Puerto Rico at Naranjito, ... It was the most widely reported earthquake (by NEIC) in the region of Puerto Rico in at least the last 10 years and the second most widely felt in the area in that time period after an M 7.3 on November 29, 2007 that occurred south of this in Dominica." October 12, 2008).

 

Forecast 143195 had expected today's earthquake was likely in this area around May 8 in this area.

 

O: 09MAY2022 06:52:10  18.7N   64.3W Md=3.8  EMSC   VIRGIN ISLANDS REGION

O:  8MAY2022 13:32:56  18.9N   64.4W Mw=4.9  EMSC   VIRGIN ISLANDS REGION        

O:  8MAY2022 13:32:58  19.0N   64.4W Mw=5.5  ANSS   VIRGIN ISLANDS REGION        

P:  8MAY2022 143195    18.0N   65.0W 3.0-5.1 AAAAA  Leeward Islands            

   

A light earthquake of M 3.3-3.5 was widely felt in the southeastern U.S. today. This event in South Carolina of M 3.3 was reported by NEIC to have been felt with intensity IV in South Carolina at Lugoff, Elgin, Columbia, Camden, Rembert, Blythewood, III in Ridgeway, and with light shaking from Canada to Florida with intensity II-IV in North Carolina, Georgia, Tennessee, Alabama, Kentucky, Virginia, DC. Ohio, Florida, Maryland, Delaware, Pennsylvania, Mississippi, Indiana, Michigan, Connecticut, Massachusetts, Missouri, Vermont, Iowa, Quebec and Oklahoma. This is the strongest earthquake in South Carolina within about 150 km of this epicenter since an M 4.1 about 100 km southwest of this on February 15, 2013 and an M 3.9 on April 13, 1998. Forecast 143273 had expected today's event within about 50 km was likely around May 5. This continues recent enhanced seismicity in this region of South Carolina which began on December 28, 2021 as reported in this summary at the time:

 

"A series of earthquakes also occurred today in South Carolina. The largest of these was an M 3.3-3.6 (EMSC). NEIC reported the mainshock at M 3.3 was felt with intensity IV in South Carolina with intensity IV in Lugoff and Elgin and III in Columbia, Camden, Rembert, Ridgeway, Blythewood. An aftershock of M 2.5 was felt in South Carolina at Lugoff, Elgin, Columbia, Camden, Ridgeway, Blythewood, and other areas of South Carolina. In the previous issue of this summary it was noted that seismicity in the  area of South Carolina often associated with strong quakes in the area of Greece which moderately large quakes shook yesterday as:

 

"An M 5.4 in the Dodecanese Islands of Southern Greece was reported felt with

intensity III in Karpathos, Dodecanese Islands, Greece by NEIC. News reports indicate there were no major damages or injuries with this earthquake. An M 5.1 foreshock was reported felt with intensity II-III in Urla, Izmir, Turkey. Earthquakes in this area of Greece are occasionally followed by increases in seismicity in the southeastern U.S. A great earthquake in Greece in late August 1886, for example was followed immediately by light earthquakes in Charleston, South Carolina and an M 7.7 there on August 31, 1886 as noted  in the August 31, 2021 issue of this summary" (December 26-27, 2021)

 

Likewise when the only event of M>=3.3 of the past 7 years in South Carolina

occurred on September 27, 2021 this summary noted the coincidence of this event with major activity in southern Greece as:

 

"A light earthquake of M 3.3 was widely felt in South Carolina today. NEIC reported maximum intensity VI in South Carolina at Summerville, Lasson and North Charleston with II-III shaking in Charleston, Goose Creek, Johns Island, Saint George, Walterboro, Sumter, Tybee. It was also reported lightly felt in Georgia, North Carolina, Virginia and Florida among others. A foreshock of M 2.8 was felt with intensity II-III in South Carolina at Summerville, Ladson, North Charleston, Ridgeville, Charleston, Goose Creek, Moncks Corner.

 

...

 

The M 7.7 in Charleston, South Carolina of August 31, 1886 followed a great  earthquake in southern Greece several days earlier and has been suggested on several occasions in this and other reports (even at the time of that quake) to have been a far-field aftershock of the M 8.4 in Greece as noted in the history section of this summary:

 

"The Charleston, South Carolina earthquake. This earthquake was preceded by four days of small foreshocks which began immediately after an M 8.4 in central Greece. That earthquake may have disturbed the groundwater sufficiently to lubricate the fault responsible for the for the Charleston quakes ultimately triggering the strong event." (August 31, 2021)

 

 

The M 3.3 today is the strongest earthquake within about 150 km of this epicenter since an M 3.6 on December 16, 2008." (September 27-28, 2021)

 

The only earthquake of M>3.6 in South Carolina in the past 10 years was an M 4.1 on February 15, 2014 and prior to that an M 4.4 on November 11, 2002 and August 21, 1992 also with M 4.4." (December 28, 2021)

 

 

O:  9MAY2022 05:32:48  34.2N   80.7W mb=3.5  EMSC   SOUTH CAROLINA               

O:  9MAY2022 05:32:48  34.2N   80.7W mb=3.3  ANSS   SOUTH CAROLINA               

P:  5MAY2022 143273    34.0N   80.0W 2.0-4.2 BAAAA  Southeast U.S.             

 

MODERATE QUAKES SHAKE INDONESIA AND OKINAWA, JAPAN

 

EARTHQUAKE SUMMARY FOR MAY  7, 2022

 

It was another relatively quiet day in global seismicity today. The strongest earthquakes occurred with M 5.4-5.5 in the Ryukyu Islands of Japan and in the Mariana Islands and in the Halmahera region of Indonesia. The most energetic of these was a swarm in  Indonesia which included five moderate earthquakes including an M 5.0 and 5.1. Forecast 143156 had expected these earthquakes were likely to the south around May 8.

 

O: 08MAY2022 02:12:45   3.8N  127.0E mb=5.0  EMSC   KEPULAUAN TALAUD, INDONESIA

O: 08MAY2022 02:18:54   3.8N  127.0E mb=4.9  EMSC   KEPULAUAN TALAUD, INDONESIA

O: 07MAY2022 18:56:52   3.9N  127.1E ML=4.2  EMSC   KEPULAUAN TALAUD, INDONESIA

O: 08MAY2022 00:47:40   4.7N  127.0E ML=4.0  EMSC   KEPULAUAN TALAUD, INDONESIA

O:  8MAY2022 02:29:03   3.7N  127.0E mb=5.2  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  8MAY2022 143156     2.0N  128.0E 4.0-5.4 ABAAA  Halmahera                  

 

NEIC reported the earthquake of M 5.5 in the Ryukyu Islands, Japan was felt with intensity II-III in the area(s) of the Ryukyu Islands, Japan in Okinawa.

Forecast 143220 had expected this activity was likely around May 5.

 

O:  7MAY2022 11:53:56  26.8N  126.5E Mw=5.5  EMSC   RYUKYU ISLANDS, JAPAN        

P:  5MAY2022 143220    27.0N  125.0E 4.0-5.5 AABAA  Ryukyu Islands             

 

O:  7MAY2022 16:58:11  18.8N  145.6E Mw=5.4  EMSC   PAGAN REG., N. MARIANA ISLANDS

P:  8MAY2022 143201    19.0N  147.0E 4.0-5.5 AAAAA  No. Marianas               

 

MODERATE QUAKE WEST OF PORTUGAL

 

EARTHQUAKE SUMMARY FOR MAY  6, 2022

 

An unusual earthquake of M 4.6 occurred west of Portugal today on the Azores-Cape St. Vincent Ridge. It was not reported felt in this remote area. This is the strongest earthquake within about 200 km of this epicenter since an M 4.6 on January 22, 2008. More recent earthquakes slightly further from today's epicenter occurred on February 17, 2020 and November 1, 2018 with M 4.6-4.7.  The area saw some great earthquakes about 50 years ago, and may be the source of the great Lisbon earthquake of November 1, 1755. Forecast 143250 had expected enhanced seismicity in this region was likely around May 4.

 

O:  6MAY2022 14:12:48  38.2N   13.4W mb=4.6  EMSC   AZORES-CAPE ST. VINCENT RIDGE

P:  4MAY2022 143250    37.0N   11.0W 3.5-5.1 ABBAA  Morocco/Spain              

 

The strongest earthquake in the world today was an M 5.5 in the Ryukyu Islands, Japan. This appears to be an aftershock of an M 5.7 of April 13, 2022. Forecasts 143220 had expected this earthquake was likely within about 100 km in early May, 2022.

 

O:  6MAY2022 13:21:08  26.8N  126.5E Mw=5.5  EMSC   RYUKYU ISLANDS, JAPAN        

P:  3MAY2022 143220    26.0N  126.0E 4.0-5.4 BAAAA  Ryukyu Islands             

P:  5MAY2022 143220    27.0N  125.0E 4.0-5.5 AABAA  Ryukyu Islands             

 

The largest earthquake felt in the U.S. or Canada today was an M 3.4 near the coast of Northern 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 in Samoa, Eureka, Arcata, McKinleyville, Fortuna and Rio Dell. Forecast 143307 had expected this earthquake was likely within about 25 km of this epicenter was likely around May 6.

 

O:  6MAY2022 20:17:26  40.8N  124.4W Ml=3.4  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  6MAY2022 143307    40.7N  124.6W 2.5-4.5 AAAAA  Off Coast of No. Calif     

 

STRONG EARTHQUAKE SHAKES MINDANAO, PHILIPPINES

 

EARTHQUAKE SUMMARY FOR MAY  5, 2022

 

The strongest earthquake in the world today was an M 5.9-6.0 in Central Mindanao, Philippines. NEIC reported maximum intensity IV in Mati and V in Canoccian, Southern Mindanao with intensity II-IV in Tagum, Davao, Buayan. This is the largest earthquake in Mindanao within about 200 km of this epicenter since an M 6.0 on April 20, 2022. These appear to be aftershocks of an M 7.1 that shook the area on August 11, 2021.  Forecasts 143157 and 143156 had expected enhanced seismicity in this area was likely around May 5-9.

 

O: 06MAY2022 04:40:47   6.3N  127.3E ML=4.3  EMSC   PHILIPPINE ISLANDS REGION

O: 05MAY2022 08:21:16   6.5N  127.1E Mw=5.9  EMSC   PHILIPPINE ISLANDS REGION

O: 05MAY2022 10:37:32   6.6N  126.9E mb=5.1  EMSC   MINDANAO, PHILIPPINES

O: 05MAY2022 14:54:31   6.6N  127.0E mb=4.6  EMSC   PHILIPPINE ISLANDS REGION

O: 05MAY2022 19:54:45   6.6N  127.0E Mw=5.0  EMSC   PHILIPPINE ISLANDS REGION

O: 06MAY2022 00:02:27   6.6N  126.9E mb=5.3  EMSC   MINDANAO, PHILIPPINES

O:  6MAY2022 01:36:10   5.9N  127.6E ML=4.3  EMSC   PHILIPPINE ISLANDS REGION    

P:  5MAY2022 143157     5.0N  124.0E 4.0-5.4 AACAA  Mindanao, Philippines      

P:  9MAY2022 143156     4.0N  129.0E 4.0-5.4 BBAAA  Halmahera                  

 

A moderately strong earthquake was also felt as an M 5.5-5.6 in Central Vanuatu. NEIC reported it was felt with intensity III in Vila Shefa, Vanuatu. The last earthquake of equal or larger magnitude within about 200 km of this epicenter in Vanuatu occurred as an M 5.6 on May 5, 2022. These are aftershocks of an M 6.0 that hit the area on April 4, 2022. Forecast 143380 had expected this earthquake within about 100 km was likely around May 3.

 

O:  5MAY2022 20:15:49  17.2S  167.9E Mw=5.5  EMSC   VANUATU                      

P:  3MAY2022 143380    18.0S  168.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

An earthquake of M 5.0 was also felt in the region of Tokyo, Japan today. NEIC reported it was felt with intensity IV in Ibaraki, Saitama and Tokyo with lesser shaking in Chiba Prefectures, Honshu, Japan. The last earthquake within about 100 km of this epicenter in southeastern Honshu, Japan occurred as an M 5.3 on April 28, 2022 and prior to that an M 5.0 on December 1, 2021. These may be aftershocks of an M 5.9 on October 7, 2021.  Forecasts 143254 and 143259 had expected this activity was likely around May 3-6 in this area.

 

O:  5MAY2022 09:42:03  36.1N  139.8E mb=5.0  EMSC   EASTERN HONSHU, JAPAN        

P:  3MAY2022 143254    37.0N  139.0E 3.5-4.9 AAAAA  No. Honshu, Japan          

P:  6MAY2022 143259    37.0N  141.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in the Andreanof Island, Aleutians, Alaska. It was reported felt with intensity III in Adak, Alaska. This is the strongest earthquake in the Andreanof Islands within about 200 km  of this epicenter since an M 5.2 on November 18, 2021. Forecast 143328 had  expected this event within about 100 km was likely around May 5.

 

O:  5MAY2022 22:58:42  51.6N  176.9W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  5MAY2022 143328    50.7N  176.2W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

 

MODERATELY STRONG QUAKE IN MINDANAO, PHILIPPINES

 

EARTHQUAKE SUMMARY FOR MAY  4, 2022

 

The strongest earthquake in the world today was an M 5.6 in Mindanao, Philippines. NEIC reported it was felt with intensity II-III in Southern Mindanao at Mambago, Davao, Tapia, Buayan, Koronadal and Barra. This is the largest earthquake in Mindanao within about 200 km of this epicenter since an M 6.0 on April 20, 2022. These appear to be aftershocks of an M 7.1 that shook the area on August 11, 2021.  Forecasts 143157 and 143156 had expected enhanced seismicity in this area was likely around May 5-9.

 

O: 04MAY2022 20:16:06   6.7N  127.1E Mw=5.1  EMSC   PHILIPPINE ISLANDS REGION

O: 05MAY2022 02:49:39   6.7N  127.2E ML=4.5  EMSC   PHILIPPINE ISLANDS REGION

O:  4MAY2022 21:41:08   6.5N  127.0E Mw=5.8  EMSC   PHILIPPINE ISLANDS REGION    

P:  8MAY2022 143156     2.0N  128.0E 4.0-5.4 BCAAA  Halmahera                  

 

A series of moderate earthquakes also occurred in the region of Valparaiso, Chile today. These included events of M 5.1 and M 5.2. The solar eclipse of April 30, 2022 was visible in this area and tidal stresses associated with this alignment may have helped promote this activity as noted in this and previous issues:

 

"The new moon arrived on April 30, 2022 at 20:28 UT. Longitudes which were at local solar noon at the time of this new moon are near 125 West while those at local solar midnight are near 55 East. In the west these include areas of western U.S. and Canada and the East Pacific Rise and in the east areas of Iran, the Caspian Sea to Turkey. These are the areas most likely to see tidal triggering during the next week but tidal triggering is possible in other areas as well and would most likely include seismicity near local solar midnight or noon. This is a partial solar eclipse visible in the Southeast Pacific and Southern South America and is most complete in Chile and Argentina where a strong earthquake may occur in conjunction with this eclipse. It is the first solar eclipse since December 21, 2021." (April 28-May 2, 2022)

 

Today's activity is associated with an M 5.0 in the region of May 3 which was noted in this summary at the time as:

 

 

"The strongest earthquake felt in the world today was an M 5.0 in the area of Valparaiso, Chile. This is the strongest earthquake near Valparaiso since an M 5.7 on November 3, 2021 and may be an aftershock of that earthquake to the southeast of today's epicenter. No other significantly larger earthquakes have hit the Valparaiso area in the past 1.5 years although quakes of M 5.0-5.1 hit on June 12 and July 31, 2021.   Forecast 143395 had expected this event was likely within about 100 km around May 6." (May 3, 2022)

 

NEIC reported the earthquake of M 5.1 in Valparaiso, Chile was felt with intensity II-III in the area(s) of Valparaiso, Chile in La Ligua, Vina del Mar and in Santiago.  This followed an M 5.2 off the coast of Valparaiso earlier in the day which was felt with intensity V in Valparaiso; VI in La Ligua and IV in Vina del Mar and III in O'Higgins and Santiago.

 

O: 04MAY2022 12:48:20  32.2S   72.0W Mw=5.1  EMSC   OFFSHORE VALPARAISO, CHILE

O: 04MAY2022 12:57:21  32.3S   72.0W mb=4.4  EMSC   OFFSHORE VALPARAISO, CHILE

O:  4MAY2022 11:59:34  32.2S   71.9W Mw=5.2  EMSC   OFFSHORE VALPARAISO, CHILE   

P:  6MAY2022 143395    33.0S   71.0W 4.0-5.6 AAAAA  Central Chile              

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 off the coast of northern California. NEIC reported it may have been felt in northern California at Arcata. This is the largest earthquake within about 100 km of this epicenter off the coast of northern California since an M 4.3 on May 2, 2021 one year ago. The last of significantly larger magnitude in the region was an M 4.6 on January 27, 2021.  Forecasts 143308 had expected enhanced seismicity in this region around May 3-6.

 

O:  4MAY2022 18:28:15  40.5N  127.4W mb=4.2  EMSC   OFF COAST OF NORTHERN CALIFORN

P:  3MAY2022 143308    41.8N  126.9W 2.5-4.6 ABAAA  Off Coast of No. Calif     

P:  6MAY2022 143308    40.9N  126.3W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

ODERATE EARTHQUAKE SHAKES VALPARAISO, CHILE

 

EARTHQUAKE SUMMARY FOR MAY  3, 2022

 

The strongest earthquake felt in the world today was an M 5.0 in the area of Valparaiso, Chile. This is the strongest earthquake near Valparaiso since an M 5.7 on November 3, 2021 and may be an aftershock of that earthquake to the southeast of today's epicenter. No other significantly larger earthquakes have hit the Valparaiso area in the past 1.5 years although quakes of M 5.0-5.1 hit on June 12 and July 31, 2021.   Forecast 143395 had expected this event was likely within about 100 km around May 6. This earthquake which occurred within about an hour of local solar midnight may have been promoted by tidal stresses with the previous new moon as noted in previous issues of this summary:

 

"The new moon arrived on April 30, 2022 at 20:28 UT. Longitudes which were at local solar noon at the time of this new moon are near 125 West while those at local solar midnight are near 55 East. In the west these include areas of western U.S. and Canada and the East Pacific Rise and in the east areas of Iran, the Caspian Sea to Turkey. These are the areas most likely to see tidal triggering during the next week but tidal triggering is possible in other areas as well and would most likely include seismicity near local solar midnight or noon. This is a partial solar eclipse visible in the Southeast Pacific and Southern South America and is most complete in Chile and Argentina where a strong earthquake may occur in conjunction with this eclipse. It is the first solar eclipse since December 21, 2021." (April 28-May 2, 2022)

 

NEIC reported today's earthquake of M 5.0 in Valparaiso, Chile was felt with intensity II-III in the area(s) of Valparaiso, Chile in Vina del Mar (IV), Calera, San Antonio, Valparaiso and Santiago.

 

 

O: 04MAY2022 06:54:10  32.3S   71.9W Mw=4.8  EMSC   OFFSHORE VALPARAISO, CHILE

O:  4MAY2022 03:45:57  32.2S   71.9W Mw=5.0  EMSC   OFFSHORE VALPARAISO, CHILE   

P:  6MAY2022 143395    33.0S   71.0W 4.0-5.6 AAAAA  Central Chile               

 

Moderate earthquakes of M 5.0 also occurred in the southwest Pacific - in the Solomon Islands, Tonga and the area of the Fiji Islands today. These were note reported felt in these remote areas and had been anticipated in forecasts 143378 and 143394.

 

O:  3MAY2022 21:42:24  19.2S  172.8W mb=5.0  EMSC   TONGA REGION                 

P:  4MAY2022 143378    19.0S  173.0W 4.0-5.6 AAAAA  Tonga Islands              

 

O:  3MAY2022 07:49:04  25.4S  179.9E mb=5.0  EMSC   SOUTH OF FIJI ISLANDS        

P:  8MAY2022 143394    25.0S  179.0E 4.0-5.5 BAAAA  Tonga/Fiji                 

 

O:  4MAY2022 06:19:59   7.3S  155.2E mb=5.1  EMSC   SOLOMON ISLANDS              

P:  3MAY2022 143168     4.0S  154.0E 4.0-5.4 ACAAA  New Britain                

 

An earthquake of M 3.8-4.2 was also reported felt in Poland today. NEIC reported this earthquake of M 4.2 in Poland was felt with intensity II-III in the area(s) of Poland in Lucin. A similar earthquake of M 4.6 and of M 4.7 hit the area earlier in April as noted in this summary at the time:

 

 

"An unusually large M 4.7 shook areas of Poland today. NEIC reported it was felt with intensity VI in Poland at Rybnik and Polkowice. This follows a pair of foreshocks in this area yesterday of M 3.2 and 3.7. These had been noted in the previous issue of this summary as:

 

 

"A pair of light earthquakes of M 3.2 and 3.6 occurred today in the region of Poland. While activity in this area is not unusual, these followed an M 4.6 in Bulgaria which occurred yesterday and may indicated some seismic enhancement in the area is being promoted by the incessant bombardment of ground targets in the ongoing hostilities in neighboring Ukraine. ...

 

 

The last earthquake of M>=3.7 in this region of Poland occurred as events of

M 4.3 on January 13, 2022 and February 5, 2022. These were probably mining-related events. Local enhanced stresses can help promote mining-related earthquakes and rockfalls by weakening pre-existing structures and this may be happening in this case. Forecast 142576 had expected today's activity was likely around April 3. This activity is at 144 degrees from the M 7.0 in the Loyalty Islands of March 31 and may have also been promoted by energy from that source." (April 7, 2022)

 

The last earthquake of M>=4.7 in this area was an M 4.9 on July 8, 2020. The largest earthquakes in this area in the past 20 years were of M 5.0 on February 20, 2002, July 21, 2009, December 30, 2010 and July 20, 2018. Forecast 142576 had expected today's event within about 50 km was likely around April 3." (April 8, 2022)

 

O:  3MAY2022 15:24:01  51.6N   16.2E ML=3.8  EMSC   POLAND                       

O:  3MAY2022 15:24:01  51.6N   16.2E ML=4.2  ANSS   POLAND                       

P:  5MAY2022 143340    50.0N   16.0E 3.0-4.4 ABAAA  Poland                      

 

 

 

AFTERSHOCKS STRONG IN KERMADEC, RAT AND FIJI ISLANDS

 

EARTHQUAKE SUMMARY FOR MAY  2, 2022

 

The strongest earthquake in the world today was an M 5.5 in the central Kermadec Islands, New Zealand. It was not reported felt in this remote area. As it occurred within minutes of local solar midnight, tidal stresses, which maximize near this time probably helped enhance the magnitude of this event. A shallow focus earthquake of M 6.6 hit about 100 km east of this on March 2, 2022 but the last events of intermediate focus, like today's, with M>=5.5  within 100 km of today's epicenter occurred as an M 5.5 on February 8, 2021 and M 6.3 on December 18, 2019.  These preceded a shallow event of M 8.1 on March 4, 2021. Forecast 143400 had expected today's enhanced activity within about 25 km was likely around May 4.

 

O:  2MAY2022 12:34:27  30.0S  178.8W Mw=5.5  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  4MAY2022 143400    30.0S  179.0W 4.0-5.6 AAAAA  No. Kermadec Islands       

 

A second moderate earthquake of M 5.4 occurred north of the Kermadec Islands today in the area south of the Fiji Islands. It was not reported felt in this remote area. This deep focus earthquake is probably an aftershock - the strongest to date - of an M 6.8 at this same epicenter which occurred February 16, 2022. Earthquakes of M>=5.4 have occurred in the area during the past year on August 18 and July 7, 2021. Forecast 143393 had expected today's activity was likely in early May.

 

O:  2MAY2022 16:27:55  23.8S  180.0W Mw=5.4  EMSC   SOUTH OF FIJI ISLANDS        

P:  5MAY2022 143393    24.0S  177.0W 4.0-5.6 BACAA  Tonga Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the Rat Islands, western Aleutians, Alaska. It was not reported felt in this remote area. This appears to be an aftershock of the M 5.7 of April 9, 2022. Similar aftershocks occurred with M 4.6 on April 12.  Today's event occurred within minutes of local solar midnight and was probably promoted by strong tidal stresses which maximize near this hour. Forecasts 143341 and 143089 had expected this activity in late April or early May within about 25 km of this epicenter.

 

O:  2MAY2022 12:48:05  51.1N  177.9E mb=4.5  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  6MAY2022 143341    50.0N  178.0E 4.0-6.2 BBAAA  Rat Islands                

P: 25APR2022 143089    51.0N  178.0E 4.0-6.0 CAAAA  Rat Islands                

 

A quiescence is occurring the the are of Indonesia. The area has seen no significant earthquakes within the pat three days following the solar Eclipse of April 30. Such quiet periods have been known to precede major regional earthquakes.

 

A series of light earthquakes occurred in the Ridgecrest area of Central California. NEIC reported this earthquake of M 3.5 in Central California was felt with intensity II-III in the area(s) of Central California in East Tulare County, Lone Pine. NEIC reported the earthquake of M 2.9 in Central California was felt with intensity II-III in the area(s) of Central California in Porterville and Ridgecrest. The strongest of these occurred within about an hour of local solar noon and midnight and were probably promoted by high tidal stresses. The M 3.3-3.5 is the strongest within about 50 km of this epicenter since an M 4.0 on October 17, 2021. A moderately strong earthquake of M 5.8 shook this are on June 23, 2020. Forecasts 143228 and 143027 had expected enhanced aftershocks in this are were likely at the end of April or in early May, 2022.

 

O:  2MAY2022 21:56:48  36.1N  118.1W ML=3.3  EMSC   CENTRAL CALIFORNIA            

O:  2MAY2022 21:56:48  36.1N  118.1W ML=3.5  ANSS   CENTRAL CALIFORNIA           

O:  2MAY2022 09:16:04  36.2N  118.2W ML=2.8  EMSC   CENTRAL CALIFORNIA           

O:  2MAY2022 09:53:50  36.2N  118.2W Ml=2.1  EMSC   CENTRAL CALIFORNIA            

P:  5MAY2022 143228    36.3N  118.1W 2.5-4.7 BAAAA  California/Nevada area     

P: 30APR2022 143027    35.7N  118.1W 2.5-4.5 ABAAA  So. California             

 

OCEANIC SEISMICITY ON QUIET DAY

 

EARTHQUAKE SUMMARY FOR APRIL 30, 2022

 

It was a relatively quiet day in global seismicity. No events of M>5.0 were recorded in the world. A series of moderate earthquake occurred in ocean  ridge areas and in the Andaman Islands of India. These may have been enhanced by tidal forces associated with the new moon today as noted in this and previous summaries:

 

"The new moon arrived on April 30, 2022 at 20:28 UT. Longitudes which were at local solar noon at the time of this new moon are near 125 West while those at local solar midnight are near 55 East. In the west these include areas of western U.S. and Canada and the East Pacific Rise and in the east areas of Iran, the Caspian Sea to Turkey. These are the areas most likely to see tidal triggering during the next week but tidal triggering is possible in other areas as well and would most likely include seismicity near local solar midnight or noon. This is a partial solar eclipse visible in the Southeast Pacific and Southern South America and is most complete in Chile and Argentina where a strong earthquake may occur in conjunction with this eclipse. It is the first solar eclipse since December 21, 2021." (April 27-30, 2022)

 

The earthquake in the Andaman Islands of India was an M 4.7. It occurred within minutes of local solar midnight and was probably promoted by high tidal stresses which maximize near this hour. While an M 4.9 hit within about 100 km of this epicenter on April 22, the last event of significantly larger magnitude in  the Andaman Islands occurred on September 11, 2021. Forecast 142947 had expected today's event within about 100 km was likely in the Andaman Islands at the end of April.

 

O: 30APR2022 17:34:03  13.2N   93.0E mb=4.7  EMSC   ANDAMAN ISLANDS, INDIA REGION

P: 23APR2022 142947    13.0N   92.0E 4.0-5.5 BAAAA  Andaman Islands            

 

Earthquakes on Mid-ocean Ridges occurred as an M 4.5 in the Chagos Archipelago; and M 4.9 in the Mid-Indian Ridge and an M 4.6 in the area west of Macquarie Island south of Australia. These events may also have been promoted by tidal effects associated with the new moon. While seismicity was low today, it is likely that moderately large events will occur in the next several days due to high tidal stresses.

 

O: 30APR2022 22:39:32   5.2S   68.7E mb=4.5  EMSC   CHAGOS ARCHIPELAGO REGION    

P: 23APR2022 142931     1.0S   67.0E 4.0-5.8 CCBAA  Indian Ocean               

 

O: 30APR2022 11:00:18  35.3S   78.5E mb=4.9  EMSC   MID-INDIAN RIDGE             

P: 25APR2022 143139    37.0S   79.0E 4.0-5.6 BBAAA  So. Indian Ocean           

 

O: 30APR2022 19:57:39  57.0S  147.4E mb=4.6  EMSC   WEST OF MACQUARIE ISLAND     

 

 

 

A pair of light earthquakes shook the region of the Geysers in northern California Sonoma County today. NEIC reported these earthquakes of M 3.3 and 3.4 in the Geysers, California were felt with intensity II-III in the area(s) of the Geysers, California in Geyserville, Kelseyville (IV), Cloverdale, Healdsburg, Hidden Valley Lake, Lower Lake, Windsor, Angwin, Napa, Suisun City and Calistoga. The only events in the Geysers area of M>=3.4 in the past half year occurred as an M 3.8 on March 3, 2022 and an M 3.6 on July 8, 2021. Forecast 142996 had expected this activity was likely around April 28.

 

O:  1MAY2022 03:17:37  38.8N  122.8W ML=3.0  EMSC   NORTHERN CALIFORNIA          

O:  1MAY2022 03:17:37  38.8N  122.8W ML=3.4  ANSS   NORTHERN CALIFORNIA          

O: 30APR2022 18:17:56  38.9N  122.8W ML=2.9  EMSC   NORTHERN CALIFORNIA

P: 28APR2022 142996    38.5N  122.7W 2.5-4.6 BAAAA  Central California         

 

MODERATELY STRONG EARTHQUAKE IN EAST PACIFIC RISE

 

EARTHQUAKE SUMMARY FOR APRIL 29, 2022

 

The strongest earthquake in the world today was an M 5.8 on the Central East Pacific Rise. It was not reported felt in this remote area. This is the strongest earthquake within about 300 km of this epicenter since an M 5.8 on September 21, 2020 and an M 6.1 on March 22, 2020. The area became activity with events of M 5.8 on October 29, 2018 following a five year hiatus in seismicity at this magnitude or above. It occurred near local solar midnight and may have been promoted by tidal stresses associated with the upcoming solar eclipse which maximize near this longitude as noted in this and previous issues of this summary:

 

"The new moon will arrive on April 30, 2022 at 20:28 UT. Longitudes which are at local solar noon at the time of this new moon are near 125 West while those at local solar midnight are near 55 East. In the west these include areas of western U.S. and Canada and the East Pacific Rise and in the east areas of Iran, the Caspian Sea to Turkey. These are the areas most likely to see tidal triggering during the next week but tidal triggering is possible in other areas as well and would most likely include seismicity near local solar midnight or noon. This is a partial solar eclipse visible in the Southeast Pacific and Southern South America and is most complete in Chile and Argentina where a strong earthquake may occur in conjunction with this eclipse. It is the first solar eclipse since December 21, 2021." (April 27-30, 2022)

 

O: 29APR2022 08:33:28   4.5S  105.0W Mw=5.8  EMSC   CENTRAL EAST PACIFIC RISE    

 

A light earthquake of M 2.8 was widely felt in the area of St. Louis, Missouri today. NEIC reported it was felt with intensity II-III in Valley Park, Ballwin, Fenton, High Ridge, Saint Louis, Eureka, It was also reported lightly felt in Illinois, Iowa, Tennessee, Indiana, Kansas and possible as far as Arkansas, Nebraska, Minnesota, Wisconsin, Michigan, Georgia, Texas, Ohio, Alabama, and Florida.  This earthquake is the strongest within about 100 km of this epicenter since an M 3.9 on April 29, 2011 and an M 2.8 on May 5, 2008. Forecast 143009 had expected a light to moderate earthquake in this area was likely to occur around April 29. One of the strongest earthquakes in this area in recent history occurred with an M 5.0 on April 30, 1899, 123 years ago (see history section of this summary).

 

O: 29APR2022 22:30:38  38.5N   90.5W Md=2.8  EMSC   MISSOURI                     

P: 29APR2022 143009    38.0N   90.0W 2.0-4.2 AAAAA  New Madrid area            

 

The strongest activity in the U.S. or Canada today were a pair of earthquakes south of Alaska in the aftershock zone of the M 7.6 of October 19, 2020. This follows an M 5.2 north of this on April 28, 2022. Other similar events with equal or greater magnitude during 2022 occurred with M 4.5-4.6 on April 10 and 13 and with M 5.3 on February 20, 2022. Today's earthquake of M 4.5 and M 4.4 occurred within about an hour of local solar midnight and solar noon about 12 hours apart, times when tidal stresses maximize and may have been promoted by high tidal stresses with the new moon (see above).

 

Forecast 143075 had expected today's activity within about 50 km was likely

around April 30.

 

O: 29APR2022 23:49:25  54.8N  159.7W mb=4.5  EMSC   SOUTH OF ALASKA

O: 29APR2022 11:25:15  54.8N  156.9W mb=4.4  EMSC   SOUTH OF ALASKA              

P: 30APR2022 143075    54.8N  158.7W 3.5-4.9 AAAAA  Alaska Peninsula           

 

 

 

 

 

 

 

STRONG QUAKE IN PAPUA NEW GUINEA

 

EARTHQUAKE SUMMARY FOR APRIL 28, 2022

 

The strongest earthquake in the world today was an M 6.0 in Papua New Guinea. It was not reported felt in this area. This epicenter is located near the geomagnetic equator and may have been promoted by the geomagnetic storm currently in progress as noted in this and previous summaries:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14. High latitudes also saw active conditions with AP 21. This is sufficient to activate higher levels of seismicity at high latitudes and near the geomagnetic equator in the next several days." (April 28, 2022) 

 

The last earthquake with M>=6 within eastern New Guinea and within about 200 km of today's epicenter was an M  6.0 on July 21, 2021 and an M 6.1 on April 27, 2021, one year ago.  Forecast 142935 had expected today's event was likely in this area around April 29.

 

O: 28APR2022 12:54:29   4.0S  146.7E mb=4.9  EMSC   EASTERN NEW GUINEA REG., P.N.G.

O: 28APR2022 13:21:14   4.0S  146.6E Mw=6.0  EMSC   EASTERN NEW GUINEA REG., P.N.G

P: 29APR2022 142935     6.0S  146.0E 4.0-5.4 ABAAA  New Ireland                

 

 

A light earthquake of M 3.1 occurred in West Virginia today. It was not reported felt. This is the largest earthquake in West Virginia within about 150 km of today's epicenter since an M 3.2 on September 13, 2017 about 150 km to the southeast of this epicenter. The last within about 100 km of this epicenter was an M 3.3 on April 24, 2009.  Forecast 143003 had expected regional seismic activation was likely around April 27. One of the strongest earthquakes recorded in West Virginia occurred on this date in 1852, 210 years ago (see history section of this summary).

 

O: 28APR2022 20:10:59  37.9N   82.2W Md=3.1  EMSC   WEST VIRGINIA                

P: 27APR2022 143003    35.9N   82.8W 2.0-4.2 ABAAA  Kentucky/Tennessee/NC      

 

The enhanced seismicity in western Texas continued today with another event of M 3.9 and a number of foreshocks and aftershocks. This continues a swarm in the area which began yesterday and may be related to high tidal stresses with the upcoming new moon and eclipse. This summary noted this in the previous issue as:

 

 

"A series of light earthquakes, including an M 3.9-4.0 occurred today in western Texas. These may have been promoted by high tidal stresses as the M 3.9 occurred within several minutes of local solar noon when tidal stresses maximize. The M 4.0 is the largest event in this region since an M 4.6 on March 25, 2022. Forecasts 143020 had expected enhanced seismicity in this area was likely around April 24-28." (April 27-28, 2022)

 

O: 28APR2022 22:48:07  31.6N  104.2W ML=2.9  EMSC   WESTERN TEXAS

O: 29APR2022 04:50:37  31.6N  104.4W ML=2.5  EMSC   WESTERN TEXAS

O: 28APR2022 08:22:38  31.7N  104.1W ML=2.8  EMSC   WESTERN TEXAS

O: 28APR2022 08:44:57  31.7N  104.4W ML=2.0  EMSC   WESTERN TEXAS

O: 28APR2022 17:08:57  31.6N  104.0W Mw=3.9  EMSC   WESTERN TEXAS                

P: 24APR2022 143020    32.2N  104.1W 2.0-4.3 AAAAA  SW U.S.A                   

P: 28APR2022 143020    32.2N  103.1W 2.0-4.3 AAAAA  SW U.S.A                    

 

 

MODERATE QUAKE SHAKES POLAND

 

EARTHQUAKE SUMMARY FOR APRIL 27, 2022

 

An M 4.5 was felt in western Poland today. NEIC reported it was felt with intensity II in Polkowice Dolnoslaskie, Poland. EMSC also noted this earthquake was felt in Poland at Grebocice, Rudna, Glogow, Jerzmanowa, Polkowice, Lubin, Scinawa, Osiek, and Przemkow. An M 4.7 occurred in this area on April 7, 2022 and this may be an aftershock of the event. At the time this summary noted in this regard:

 

 

"The last earthquake of M>=3.7 in this region of Poland occurred as events of

M 4.3 on January 13, 2022 and February 5, 2022. These were probably mining-related events. Local enhanced stresses can help promote mining-related earthquakes and rockfalls by weakening pre-existing structures and this may be happening in this case. Forecast 142576 had expected today's activity was likely around April 3. This activity is at 144 degrees from the M 7.0 in the Loyalty Islands of March 31 and may have also been promoted by energy from that source." (April 7, 2022)

 

The last earthquake of M>=4.7 in this area was an M 4.9 on July 8, 2020. The largest earthquakes in this area in the past 20 years were of M 5.0 on February 20, 2002, July 21, 2009, December 30, 2010 and July 20, 2018." (April 8, 2022)

 

Forecast 143085 had expected enhanced activity in this area was likely around April 24. Like recent earthquakes in Cyprus, Ukraine, Bulgaria, Bosnia, North Macedonia, this event is at 144 degrees from the M 3.0 in the Loyalty Islands of March 31, 2022 and may have been promoted by energy from that source.

 

O: 27APR2022 18:53:25  51.6N   16.2E mb=4.5  EMSC   POLAND                       

P: 24APR2022 143085    50.0N   12.0E 3.0-4.6 BBCAA  No. Germany                

 

An earthquake of M 2.9 was felt several hours before the M 4.5 in Poland in the area of Germany to the west of that event. This is an unusual epicenter. EMSC reported this earthquake of M 2.9 in Germany was felt with intensity II-III in the area(s) of  Germany at Jungingen, Hechingen, Albstadt, Bisingen, Ofterdingen, Nehrn, Reutlingen, and Stuttgart. The last event of equal or larger magnitude within about 100 km of this epicenter was an M 3.1  on December 25, 2008.  Forecast 143041 had expected enhanced activity in this area of Germany and Austria was likely around April 27.

 

O: 27APR2022 15:24:07  48.3N    9.0E ML=2.9  EMSC   GERMANY                      

P: 27APR2022 143041    48.0N    7.0E 3.0-5.3 AABAA  Austria                    

 

The strongest earthquake in the U.S. or Canada today was an M 5.2-5.4 in the Alaska Peninsula. NEIC reported it was felt with intensity II-III in Perryville, Kodiak, Manokotak and Anchorage, Alaska. While an M 5.3 occurred within about 200 km of today's event on February 20, 2022 the last event of significantly larger magnitude was an M 6.9 on October 31, 2021. Today's event is probably the largest aftershock of that event to date. Forecast 143075 had expected today's event was likely in the Alaska Peninsula around April 30.

 

O: 28APR2022 03:33:41  56.5N  156.8W Mw=5.4  EMSC   ALASKA PENINSULA             

P: 30APR2022 143075    54.8N  158.7W 3.5-4.9 ABAAA  Alaska Peninsula           

 

The earthquake in the Alaska Peninsula joined an M 5.4 in the South Sandwich Islands and an M 4.9 in South Georgia Island today. The events of M 5.4 are the largest of the day. The area of the Alaska Peninsula and South Sandwich Islands saw increases in seismicity with the previous geomagnetic storm about a week ago. Like those, today's events were probably promoted by the new geomagnetic storm which began about the time of these events. Geomagnetic storms tend to increase seismicity at high latitudes as noted in this and previous summaries:

 

"The geomagnetic field saw active conditions today. The AP level was 21. High latitudes also saw active conditions with AP 22. This is sufficient to activate higher levels of seismicity at high latitudes and near the geomagnetic equator in the next several days. " (April 27, 2022)

 

Forecasts 143147 had expected this activity in the South Georgia and Sandwich Islands was likely around April 25-26.

 

O: 27APR2022 12:03:16  55.3S   31.0W mb=4.9  EMSC   SOUTH GEORGIA ISLAND REGION  

P: 25APR2022 143147    55.0S   28.0W 4.0-5.7 AABAA  So. Sandwich Islands       

 

O: 27APR2022 09:26:59  60.2S   24.9W Mw=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 26APR2022 143147    58.0S   25.0W 4.0-5.6 ACAAA  So. Sandwich Islands       

 

A series of light earthquakes, including an M 3.9-4.0 occurred today in western Texas. These may have been promoted by high tidal stresses as the M 3.9 occurred within several minutes of local solar noon when tidal stresses maximize. The M 4.0 is the largest event in this region since an M 4.6 on March 25, 2022. Forecasts 143020 had expected enhanced seismicity in this area was likely around April 24-28.

 

NEIC reported these earthquakes of M 3.6 and 4.0 in Western Texas were felt with intensity II-III in the area(s) of Western Texas in Pecos.

 

O: 27APR2022 20:41:25  31.6N  104.0W ML=3.8  EMSC   WESTERN TEXAS

O: 28APR2022 04:07:35  31.6N  104.0W ML=3.0  EMSC   WESTERN TEXAS

O: 28APR2022 04:10:57  31.6N  104.0W ML=3.7  EMSC   WESTERN TEXAS

O: 28APR2022 04:21:58  31.6N  104.0W ML=2.9  EMSC   WESTERN TEXAS

O: 27APR2022 07:04:22  31.7N  104.2W ML=2.1  EMSC   WESTERN TEXAS

O: 28APR2022 01:44:07  31.7N  104.4W ML=3.4  EMSC   WESTERN TEXAS

O: 27APR2022 18:54:12  31.6N  104.0W Mw=3.9  EMSC   WESTERN TEXAS                

O: 27APR2022 18:54:12  31.6N  104.0W Mw=4.0  ANSS   WESTERN TEXAS                

P: 24APR2022 143020    32.2N  104.1W 2.0-4.3 BAAAA  SW U.S.A                   

P: 28APR2022 143020    32.2N  103.1W 2.0-4.3 AAAAA  SW U.S.A                   

 

An earthquake of M 4.9 in Oaxaca, Mexico today was widely felt with moderate intensity. NEIC reported intensity VII in Oaxaca at Huatulco, Miahuatlan, Coatlan; VI in Fochutla, V in Xitla, IV in Puerto Escondido and III in Xadani.

 

 

O: 27APR2022 11:01:33  16.1N   96.4W mb=4.9  EMSC   OAXACA, MEXICO               

P: 29APR2022 142969    15.0N   97.0W 3.5-5.1 ABAAA  Oaxaca, Mexico              

 

 

MODERATE QUAKES SHAKE MEDITERRANEAN SEA

 

EARTHQUAKE SUMMARY FOR APRIL 26, 2022

 

Several moderate earthquakes shook regions of the  Mediterranean Sea today. An M 4.9 in Cyprus was widely felt but an M 5.0 west of this was not reported felt in  that remote area. These events, as well as an M 2.6 in Ukraine are located between 142 and 148 degrees from the M 7.0 in the Loyalty Islands of March 31 and were probably promoted by energy from that source.

 

The M 4.9 in Cyprus was reported by NEIC to have been felt with intensity V in Cyprus at Konis and IV in Palos, Chlorakas, Empa,  Lemoa, Koloni, Konia, Lempa, Agia Marinouda, Mesogi. NEIC reported the aftershock of M 4.2 in Cyprus was felt with intensity II-III in the area(s) of Cyprus at Chicrakas, Pafos, Fissouri and in Lebanon. An M 6.6 hit northeast of this in the area of Cyprus on January 11, 2022 with an aftershock of M 5.3 on February 2, 2022, the last event in the region of equal or larger magnitude in the region. Forecast 143034 had expected today's event within about 50 km was likely around April 25.

 

O: 26APR2022 19:11:35  34.6N   32.4E mb=4.8  EMSC   CYPRUS REGION                

O: 26APR2022 19:11:35  34.6N   32.4E mb=4.9  ANSS   CYPRUS REGION                

O: 26APR2022 20:02:21  34.8N   32.6E mb=4.2  EMSC   CYPRUS REGION                

P: 25APR2022 143034    35.0N   33.0E 3.5-5.1 AAAAA  Turkey                     

 

The event of M 5.1 in central Mediterranean Sea was not reported felt. The last event within about 200 km of this epicenter with M>=5.1 was an M 5.1 on December 18, 2021 but the last in this area with larger magnitude was an M 6.0 on November 27, 2019. Forecast 143010 had expected today's event within about 50 km was likely around April 24.

 

O: 27APR2022 01:51:53  35.9N   22.6E mb=5.1  EMSC   CENTRAL MEDITERRANEAN SEA    

P: 24APR2022 143010    36.0N   22.0E 3.0-4.5 BAAAA  No. Greece                 

 

An M 2.6 was recorded today in eastern Ukraine. It may have been promoted by ground motions from the current hostilities in the region. The last earthquake of equal or larger magnitude in the area occurred about 100 km northeast of this epicenter with M 4.3 on September 23, 2021. The last such earthquake within about 100 km of this epicenter with M>=2.6 was an M 3.7 on October 16, 1995. The only other such event within about 150 km of this epicenter in the past 30 years in Ukraine was an M 4.5 on June 24, 2011. Forecast 142839 had expected regional seismic enhancement around April 19.

 

O: 26APR2022 11:06:50  48.2N   25.3E ML=2.6  EMSC   UKRAINE                      

P: 19APR2022 142839    50.0N   20.0E 3.0-4.4 CBCAA  Poland                     

 

The strongest earthquakes in the world today were events of M 5.2 in the Kermadec Islands, New Zealand and in Papua New Guinea. These may have been lightly felt in these remote areas but are not unusual earthquakes for these regions.

 

O: 27APR2022 01:27:29  33.1S  179.5W mb=5.2  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 30APR2022 143141    32.0S  179.0W 4.0-5.6 BBAAA  So. Kermadec Islands       

 

O: 26APR2022 19:08:19   4.0S  142.7E Mw=5.2  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P: 30APR2022 142937     4.0S  143.0E 4.0-5.4 BAAAA  Papua New Guinea           

 

The largest earthquake in the U.S. or Canada today was an M 3.6 in the Yukon Territory, Canada The last earthquake within about 150 km of this epicenter with M>=3.6 was an M The last earthquake within about 150 km of this epicenter with M>=3.6 was an M 3.8 on November 17, 2017.  Forecast 143100 had expected enhanced seismicity to the southwest of this epicenter was likely around April 26.

 

O: 26APR2022 15:54:32  66.3N  141.4W MB=3.6  ECAN of Rampart House, YT           

O: 26APR2022 15:54:31  66.3N  141.4W ML=3.2  EMSC   NORTHERN ALASKA              

P: 26APR2022 143100    63.1N  144.7W 3.2-5.0 ACBAA  Central Alaska             

 

An M 4.5 also occurred today in the Virgin Islands. The last earthquake of M>=4.5 within about 100 km of this event in the Virgin Islands occurred more than  a year ago as an M 4.8 on March 9, 2021. Forecast 142958 had expected today's event was likely within about 25 km around April 26.

 

O: 26APR2022 23:50:38  19.3N   65.0W mb=4.5  EMSC   VIRGIN ISLANDS REGION        

P: 26APR2022 142958    19.0N   65.0W 3.0-5.0 AAAAA  Leeward Islands            

 

 

SEISMICITY IN BOSNIA EXPANDS TO NORTH MACEDONIA AND BULGARIA

 

EARTHQUAKE SUMMARY FOR APRIL 25, 2022

 

Seismicity expanded today from the site of the M 5.7 in Bosnia and Herzgovina of April 22, 2022 and the M 4.8 of April 24 into adjoining areas of Bulgaria and North Macedonia. An M 4.2 with aftershocks of M 3.5 and 3.2  in this area was lightly felt today about 200 km southeast of the epicenter in Bosnia. This is the strongest earthquake within about 100 km of this epicenter since an M 4.3 and 5.1 about 100 km south of this on January 1 and 2, 2018. Forecast 143068 had expected today's activity was likely within about 25 km around April 22. This epicenter is at 146 degrees from the M 7.0 in the Loyalty Islands of March 31 and may have been promoted by energy from that source.

 

O: 25APR2022 16:55:30  41.9N   22.9E mb=4.2  EMSC   BULGARIA

O: 25APR2022 23:22:28  41.9N   22.9E ML=3.2  EMSC   REPUBLIC OF NORTH MACEDONIA

O: 25APR2022 16:31:45  41.9N   22.9E ML=3.5  EMSC   REPUBLIC OF NORTH MACEDONIA  

P: 22APR2022 143068    42.0N   23.0E 3.0-5.1 AAAAA  Romania/NW Turkey          

 

The strongest earthquake in the U.S. or Canada today - an M 4.6 south of Alaska continued elevated seismicity in this area which began with the last geomagnetic storm. This is the strongest earthquake within about 100 km of this epicenter since an M 4.7 on October 1, 2021 and prior to that an M 5.6 and 5.0 on September 16, 2021 and may be an aftershock of those events. Forecast 142826 had expected today's activity within about 100 km of this epicenter was likely around April 18.

 

O: 25APR2022 16:31:31  54.7N  156.2W mb=4.6  EMSC   SOUTH OF ALASKA              

P: 18APR2022 142826    54.8N  157.7W 3.5-4.9 CAAAA  Alaska Peninsula           

 

 

MODERATE QUAKES SHAKE JAPAN, KURILS

 

EARTHQUAKE SUMMARY FOR APRIL 24, 2022

 

The strongest earthquakes in the world today occurred today in the northwestern Pacific rim. These events occurred with M 5.4 east of the Kuril Islands; an M 5.3 in Hokkaido, Japan and an M 5.3 east of Taiwan in the southwestern Ryukyu Islands. The events in the Kuril Islands follow an M 5.7 near this area which occurred yesterday and were noted in the previous issue of this summary as:

 

 

"The strongest earthquake in the world today was an M 5.7 in the Kuril Islands. This occurred southwest of the swarm that hit the area yesterday. It was followed by aftershocks of M 4.5 and 4.6. The mainshock occurred within minutes of local solar noon and may have been promoted by high tidal stresses which maximize near this hour. The last earthquakes of M>=5.7 in this region were and M 6.0 on September 20, 2021 and an M 5.8 on March 7, 2018. Forecast 143070 had expected today's event was likely within about 100 km around April 26." (April 24, 2022)

 

O: 25APR2022 05:35:50  46.0N  152.9E mb=5.4  EMSC   EAST OF KURIL ISLANDS

O: 24APR2022 07:10:38  46.1N  152.6E mb=4.6  EMSC   KURIL ISLANDS

O: 24APR2022 08:42:40  46.2N  152.6E mb=4.5  EMSC   KURIL ISLANDS

O: 25APR2022 06:10:23  45.7N  153.4E mb=4.2  EMSC   EAST OF KURIL ISLANDS        

P: 26APR2022 143070    46.0N  154.0E 3.5-5.8 AAAAA  So. Kurils                 

 

O: 24APR2022 08:16:12  41.8N  143.8E Mw=5.3  EMSC   HOKKAIDO, JAPAN REGION       

P: 24APR2022 143045    42.0N  144.0E 3.5-5.8 AAAAA  Hokkaido, Japan            

 

The M 5.3 in the southwestern Ryukyu Islands, Japan was widely felt in Taiwan. CWB reported this earthquake was felt with intensity II in Hualien, Taitung, Hsinchu, Changhua and I in Yilan, Nantou, Taichung, Taipei, Chiayi, Taipei, Taoyuan, Yunlin, Kaohsiung, Pingtung, Miaoli, Tainan Counties, Taiwan. NEIC reported this earthquake of M 5.3 in the Southern Ryukyu Islands was felt with intensity II-III in the area(s) of Taiwan in Taipei. The last earthquake of M>=5.3 in the Southwestern Ryukyu Islands was an M 5.3 on June 18, 2020. Today's activity follows activation of Taiwan and the Ryukyu Islands over the past several weeks. Forecast 142985 had expected today's event was likely within about 100 km around April 24.

 

O: 24APR2022 08:23:49  23.5N  123.3E ML=5.6  TAI    Hualien, Taiwan              

O: 24APR2022 10:23:47  23.5N  123.3E Mw=5.3  EMSC   SOUTHWESTERN RYUKYU ISL., JAPA

P: 24APR2022 142985    24.0N  124.0E 4.0-5.4 AAAAA  Taiwan                     

 

Seismicity at high latitudes continued today with moderate earthquakes in the South Sandwich Islands and in the Norwegian Sea. An M 4.8 in the Norwegian Sea was followed by aftershocks of M 4.1 and 4.3. The last such earthquake in the Norwegian Sea of M>=4.8 was an M 5.8 near this epicenter on December 14, 2020. Today's activity is probably aftershocks of that event. The mainshock of M 4.8 occurred within minutes of local solar midnight and may have been promoted by strong tidal stresses which maximize near this hour. Forecast 143108 had expected today's  activity was likely within about 50 km around April 24.

 

O: 25APR2022 00:28:00  72.4N    2.3E Mw=4.8  EMSC   NORWEGIAN SEA

O: 25APR2022 02:01:58  72.4N    2.7E mb=4.1  EMSC   NORWEGIAN SEA

O: 25APR2022 05:07:29  72.5N    3.0E mb=4.3  EMSC   NORWEGIAN SEA                

P: 24APR2022 143108    72.0N    0.0E 3.0-4.6 AAAAA  Norway                     

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in the Gulf of Alaska. It was not reported felt in this remote area. The last earthquake in the Gulf of Alaska within about 150 km of this epicenter with M>=4.1 occurred six years ago on September 20, 2016 with M 4.2 and as an M 5.0 on May 2, 2016. Forecast 143096 had expected today's activity was likely within this area around April 24.

 

O: 24APR2022 21:06:09  58.7N  145.7W mb=4.1  EMSC   GULF OF ALASKA               

P: 24APR2022 143096    60.1N  147.1W 3.2-5.4 ABAAA  Central Alaska             

 

 

MODERATE QUAKE SHAKES VANCOUVER ISLAND, CANADA

 

EARTHQUAKE SUMMARY FOR APRIL 23, 2022

 

The strongest earthquake in the U.S. or Canada today was an M 5.3 in the Vancouver Island, B.C. area of Canada. NEIC reported it was felt with intensity II-III in Port Hardy, Port MacNeill and Port Alcerni. This is the strongest earthquake within about 150 km of this epicenter in the Vancouver area since an M 6.4 on July 22, 2020. A series of large earthquakes hit the area on December 23 and 25, 2019 with events of M 6.0, 6.0, 6.3 and 5.7 and today's event may be an aftershock of that series. It occurred near local solar noon and may have been promoted by high tidal stresses which maximize near this hour. Forecast 143072 and 143080 had expected this activity was likely within about 50 km around April 24-25. This event is located at 90 degrees (node 4) from the M 7.0 in the Loyalty Islands of March 31 and may have been promoted by energy from that source.

 

O: 23APR2022 21:22:47  50.4N  129.7W Mw=5.3  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 24APR2022 143072    49.9N  130.2W 2.8-5.1 AAAAA  Vancouver Island area      

P: 25APR2022 143080    50.6N  130.5W 3.0-5.1 AAAAA  British Colombia           

 

An unusual earthquake of M 2.5 occurred today in east-central Maine. NEIC reported it was felt widely in Maine with IV in Kennebunk and III in Sebec, Dover Foxcroft, Milo and II in Eastport, Newbury, Vermont and Somerville, Massachusetts. This is the strongest earthquake within about 100 km of this epicenter since an M 2.7 on March 25, 2011 and an M 2.6 on May 2, 2011.  Forecast 143049 had expected regional activation within about 100 km of this epicenter was likely around April 22. This epicenter is located at the sixth node (60.0 degrees) from the M 6.8 in the Fox Islands of January 11, 2022 and may have been promoted by energy from that source.

 

O: 23APR2022 21:02:56  45.2N   69.1W mb=2.5  EMSC   MAINE                        

P: 22APR2022 143049    44.0N   69.0W 2.0-4.0 ABAAA  Maine                      

 

The strongest earthquake in the world today was an M 5.7 in the Kuril Islands. This occurred southwest of the swarm that hit the area yesterday. It was followed by aftershocks of M 4.5 and 4.6. The mainshock occurred within minutes of local solar noon and may have been promoted by high tidal stresses which maximize near this hour. The last earthquakes of M>=5.7 in this region were and M 6.0 on September 20, 2021 and an M 5.8 on March 7, 2018. Forecast 143070 had expected today's event was likely within about 100 km around April 26.

 

O: 24APR2022 01:34:59  46.1N  152.8E Mw=5.7  EMSC   KURIL ISLANDS                

O: 24APR2022 07:10:38  46.1N  152.6E mb=4.6  EMSC   KURIL ISLANDS

O: 24APR2022 04:01:47  46.4N  152.5E mb=4.5  EMSC   KURIL ISLANDS

P: 26APR2022 143070    46.0N  154.0E 3.5-5.8 AAAAA  So. Kurils                 

 

A moderate aftershock of M 4.8 occurred in Bosnia and Herzegovina today. NEIC reported this earthquake of M 4.8 in Bosnia and Herzegovina was felt with intensity II-III in the area(s) of Bosnia and Herzegovina in Stolac, Gacko, Citiluk, Mostar, Trecinja, Trecinje, Bijela and in Croatia at Dubrovnik, Cilici, Curzola.

 

This follows the M 5.7 in the area yesterday which was noted in this summary at the time as:

 

"An M 5.7 earthquake shook areas of Bosnia and Herzegovina today. NEIC reported maximum intensity VI in Ljucinja, Bileca, Cacljina, IV in Blagaj, Gabic, Trecinja, Zaton, Mokossica and V in Mostar, Citluk among others.   Associated Press reported this earthquake near Mostar killed one person and injured two others while causing hundreds to leave their homes and businesses. The death and injuries occurred to a woman and her parents were hit by a rock dislodged by the earthquake slammed into their home in Stolac, a city near Mostar. This earthquake was also felt in Croatia, Serbia and Montenegro. The mainshock was followed by moderate aftershocks of M 4.3 and 4.4 which were also lightly felt in Bosnia and Herzegovina. A strong M 6.4 hit about 300 km northwest of this on

December 29, 2020 and an M 6.4 occurred about 250 km southeast of this on November 26, 2019. The only earthquake of equal or larger magnitude, however, within about 200 km of this epicenter in the past 30 years was an M 6.0 on September 5, 1996. Forecast 143046 had expected today's event within about 25 km was likely around April 24. This epicenter is at 149 degrees from the M 7.0 in the Loyalty Islands of March 31 and at the sixth node (60 degrees) from the Qinghai, China M 6.9 of January 7, 2022 and may have been promoted by energy from those sources. It occurred near local solar midnight and may also have been promoted by geomagnetic and tidal stresses which maximize near this hour." (April 23, 2022)

 

O: 24APR2022 04:27:54  43.1N   18.2E Mw=4.8  EMSC   BOSNIA AND HERZEGOVINA       

P: 24APR2022 143046    43.0N   18.0E 3.0-5.1 AAAAA  Italy                      

 

A pair of moderate aftershocks of M 5.3 and 5.4 occurred today in Nicaragua. These follow the M 6.7 in Nicaragua of April 21.  NEIC reported these earthquakes of M 5.3 and 5.4 in Nicaragua were felt with intensity II-III in the area(s) of Nicaragua in Managua and San Juan del Sur, Rivas.  Forecast 142964 had expected this activity within about 100 km was likely around April 22.

 

O: 23APR2022 23:57:04  11.3N   87.1W Mw=4.8  EMSC   NEAR COAST OF NICARAGUA

O: 24APR2022 03:23:30  11.3N   87.0W ML=4.3  EMSC   NEAR COAST OF NICARAGUA

O: 23APR2022 22:10:10  11.5N   87.0W mb=5.4  EMSC   NEAR COAST OF NICARAGUA

O: 23APR2022 22:05:45  11.3N   87.1W Mw=5.3  EMSC   NEAR COAST OF NICARAGUA      

P: 22APR2022 142964    12.0N   86.0W 3.5-5.3 AAAAA  Nicaragua                  

 

 

 

 

MODERATELY STRONG QUAKE SHAKES BOSNIA AND HERZEGOVINA

 

EARTHQUAKE SUMMARY FOR APRIL 22, 2022

 

An M 5.7 earthquake shook areas of Bosnia and Herzegovina today. NEIC reported maximum intensity VI in Ljucinja, Bileca, Cacljina, IV in Blagaj, Gabic, Trecinja, Zaton, Mokossica and V in Mostar, Citluk among others. Associated Press reported this earthquake near Mostar killed one person and injured two others while causing hundreds to leave their homes and businesses. The death and injuries occurred to a woman and her parents were hit by a rock dislodged by the earthquake slammed into their home in Stolac, a city near Mostar. This earthquake was also felt in Croatia, Serbia and Montenegro. The mainshock was followed by moderate aftershocks of M 4.3 and 4.4 which were also lightly felt in Bosnia and Herzegovina. A strong M 6.4 hit about 300 km northwest of this on

December 29, 2020 and an M 6.4 occurred about 250 km southeast of this on November 26, 2019. The only earthquake of equal or larger magnitude, however, within about 200 km of this epicenter in the past 30 years was an M 6.0 on September 5, 1996. Forecast 143046 had expected today's event within about 25 km was likely around April 24. This epicenter is at 149 degrees from the M 7.0 in the Loyalty Islands of March 31 and at the sixth node (60 degrees) from the Qinghai, China M 6.9 of January 7, 2022 and may have been promoted by energy from those sources. It occurred near local solar midnight and may also have been promoted by geomagnetic and tidal stresses which maximize near this hour.

 

O: 22APR2022 22:25:34  43.1N   18.2E ML=3.9  EMSC   BOSNIA AND HERZEGOVINA

O: 23APR2022 00:59:09  43.1N   18.0E ML=4.3  EMSC   BOSNIA AND HERZEGOVINA

O: 23APR2022 02:20:27  43.1N   18.0E mb=4.4  EMSC   BOSNIA AND HERZEGOVINA

O: 22APR2022 21:07:49  43.1N   18.2E Mw=5.7  EMSC   BOSNIA AND HERZEGOVINA       

P: 24APR2022 143046    43.0N   18.0E 3.0-5.1 AAAAA  Italy                      

 

The strongest earthquake in the U.S. or Canada today occurred in southern Alaska with M 3.8-4.0. NEIC reported it was felt with intensity II-III in Wasilla, Willow, Elmendorf AFB, Fort Richardson, Anchorage. This epicenter is about 100 km to the east of the normal seismicity in this area and is the largest in this area since an M 4.8 on April 27, 2021 and an M 5.3 on February 27, 2021. Forecast 143100 had expected enhanced seismicity in this area was likely around April 24. This epicenter is at 101 degrees from the M 6.9 in Sumatra of March 13 and may have been promoted by energy from that source.

 

O: 22APR2022 09:23:14  61.4N  150.1W ML=3.0  EMSC   SOUTHERN ALASKA

O: 22APR2022 11:49:49  61.5N  149.9W Mw=4.0  EMSC   SOUTHERN ALASKA              

P: 24APR2022 143100    63.0N  148.6W 3.2-4.9 ABAAA  Central Alaska             

 

MODERATE AFTERSHOCK SHAKES ALASKA PENINSULA

 

EARTHQUAKE SUMMARY FOR APRIL 21, 2022

 

The strongest earthquake in the U.S. or Canada today was an M 5.3 in the Alaska Peninsula. NEIC reported it was felt with intensity II in Sand Point, Alaska. This earthquake is located about 150-200 km north of the current aftershock zone in the Alaska Peninsula. The last earthquake within this region of equal or greater magnitude was an M 5.3 on June 29, 2016. The only earthquake of larger size in this region within about 150 of today's epicenter was an M 5.8  on January 20, 2000. Earthquakes near today's occur at intermediate focal depths while those to the south are at shallow focus and are felt with stronger intensity than those at intermediate depths. Forecast 143075 had expected today's event in this area was likely around Aptil 23.

 

O: 22APR2022 05:27:34  56.3N  161.7W Mw=5.3  EMSC   ALASKA PENINSULA             

P: 23APR2022 143075    55.8N  160.7W 3.5-4.9 AAAAA  Alaska Peninsula           

 

A moderate earthquake of M 5.1 also occurred north of Greenland today in the Arctic Ocean. This and the M 5.3 in Alaska at high latitudes were probably promoted by the strong geomagnetic storms of recent days and the X-class solar flares. The only earthquake in this area north of Greenland within about 300 km of today's epicenter with equal or larger magnitude in the past 30 years was an M 5.6 on August 10, 1993. Forecast 143107 had expected regional seismic enhancement was likely around April 22.

 

O: 21APR2022 20:32:38  83.0N   27.9W Mw=5.1  EMSC   NEAR NORTH COAST OF GREENLAND

O: 21APR2022 20:32:39  83.0N   28.1W Mw=5.1  ANSS   NEAR NORTH COAST OF GREENLAND

P: 22APR2022 143107    71.0N   13.0W 3.5-5.3 ACAAA  Jan Mayen Isl. area        

 

A series of moderate earthquakes occurred in the Kuril Islands today with maximum event of M 5.2. The last earthquake within about 150 km of this epicenter with equal or greater magnitude was an M 6.0 on September 20, 2021. An M 5.4 about 200 km northeast of this occurred on April 4, 2022. Forecast 143070 had expected enhanced seismicity in this region around April 18-26.

 

O: 21APR2022 13:59:23  46.0N  153.1E mb=4.5  EMSC   EAST OF KURIL ISLANDS

O: 21APR2022 15:30:22  46.0N  153.0E mb=4.3  EMSC   KURIL ISLANDS

O: 21APR2022 12:38:54  46.1N  152.9E mb=5.2  EMSC   KURIL ISLANDS

O: 21APR2022 17:34:08  46.1N  152.9E mb=4.8  EMSC   KURIL ISLANDS

O: 21APR2022 13:01:06  46.0N  153.1E mb=4.4  EMSC   EAST OF KURIL ISLANDS        

P: 18APR2022 142819    45.0N  151.0E 3.5-5.8 BABAA  So. Kurils                  

P: 26APR2022 143070    46.0N  154.0E 3.5-5.8 BAAAA  So. Kurils                 

 

The earthquake swarm in southern California which has been ongoing for the past several days continued today. The largest earthquake in this swarm today was an M 3.6. NEIC reported this earthquake of M 3.6 in Southern California was felt with intensity II-III in the area(s) of Southern California in Imperial, Brawley, El Centro, Calipatria and in Mexicali, Baja California, Mexico.  This series of earthquakes was noted in  previous issues of this summary as:

 

 

"The swarm of light earthquakes in southern California, described in the previous issue of this summary also continued today. The largest of these of M 3.7 was associated with flare 7730 and, as with the swarm yesterday, occurred near local solar noon and may have been promoted by energy from tidal and geomagnetic effects. Forecast 142767 had expected enhanced seismicity in this area was likely around April 17." (April 20, 2022)

 

and

 

"A series of light earthquakes were felt near the Baja-Southern California border today. These included an M 3.3 felt with intensity II in Delta, Baja California and El Centro, California among others.  An earthquake of M 4.1 also occurred southeast of this epicenter in the northern Gulf of California today and was accompanied by earthquakes of M 3.4, 3.6, 3.7 among others. The M 3.4  in Baja California occurred within minutes of local solar noon and was probably promoted by high tidal stresses which maximize near this hour. Forecast 142765 and expected this activity within about 50 km was likely around April 16. This activity is located at 103-104 degrees from the M 6.9 in Qinghai, China of January 7, 2022 and at the fourth node (90 degrees) from the M 7.0 in the Loyalty Islands of March 31 and was probably promoted by energy from those sources." (April 19, 2022)

 

 

NEIC reported the earthquake of M 3.6 in Southern California was felt with intensity II-III in the area(s) of Southern California in Imperial, Brawley, El Centro, Calipatria and in Mexicali, Baja California, Mexico. Forecast 143023 had expected today's continuing activity was likely around April 24.

 

O: 21APR2022 07:11:43  32.9N  115.5W Ml=2.5  EMSC   SOUTHERN CALIFORNIA

O: 21APR2022 16:37:19  32.9N  115.5W ML=2.5  EMSC   SOUTHERN CALIFORNIA

O: 21APR2022 18:58:50  32.9N  115.5W Mw=3.6  EMSC   SOUTHERN CALIFORNIA

O: 22APR2022 03:50:34  32.9N  115.5W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 21APR2022 23:16:22  32.3N  115.3W Ml=2.6  EMSC   BAJA CALIFORNIA, MEXICO      

P: 24APR2022 143023    32.5N  115.7W 2.5-4.4 BAAAA  So. California             

 

 

Aftershocks of the M 6.7 in Nicaragua earlier in the day also continued today.

 

The mainshock was described in the previous issue of this summary as:

 

"The last earthquake in Nicaragua within about 250 km of today's epicenter with equal or larger magnitude occurred on September 5, 2012 with M 7.6 and prior to that an M 7.0 on October 9, 2004.  Forecast 142703 had expected today's event within about 100 km was likely around April 19. This epicenter is near 103 degrees from the M 7.0 in the Loyalty Islands of March 31. Along with events in Central Chile, Mexico, Guatemala, Ecuador, it appears likely to have been promoted by energy from that source." (April 20-21, 2022)

 

Forecasts 142703 and 142964 had expected this activity in Nicaragua was likely around April 19-22.

 

O: 21APR2022 09:06:05  11.6N   87.0W mb=4.1  EMSC   NEAR COAST OF NICARAGUA

O: 21APR2022 07:42:45  11.7N   86.9W Mw=6.7  EMSC   NEAR COAST OF NICARAGUA

O: 21APR2022 08:20:59  11.7N   87.0W mb=4.3  EMSC   NEAR COAST OF NICARAGUA

O: 21APR2022 12:50:47  11.7N   86.9W ML=4.0  EMSC   NEAR COAST OF NICARAGUA

O: 21APR2022 13:19:58  11.8N   86.8W mb=4.5  EMSC   NEAR COAST OF NICARAGUA

O: 21APR2022 07:51:01  11.5N   87.0W ML=4.0  EMSC   NEAR COAST OF NICARAGUA      

P: 19APR2022 142703    12.0N   86.0W 3.5-5.3 AAAAA  Nicaragua                  

P: 22APR2022 142964    12.0N   86.0W 3.5-5.3 AAAAA  Nicaragua                  

 

STRONG EARTHQUAKE SHAKES NICARAGUA AFTER MAJOR SOLAR FLARE

 

EARTHQUAKE SUMMARY FOR APRIL 20, 2022

 

The strongest earthquake in the world today was an M 6.7 in Nicaragua. NEIC reported it was felt with maximum intensity V in El Crucero, Managua, Diriamba, La Paz Centro Leon, and Ciudad Sandino with IV in El Jicaro, San Rafael del Sur, Villa El Carmen, Nagarote, Jinotepa Carazo.

 

This event occurred several hours after a strong X-flare which occurred

with the following SWPC parameters:

 

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

 

XXXX       0150   2000      0210   X1.0      (April 21, 2022)    8.0E-02  

 

Nicaragua was near local solar midnight when the earthquake occurred and may  have been promoted by Solar Flare effects (SFE) and strong tidal stresses. This summary had expected enhanced seismicity near this longitude was likely with the full moon as:

 

"The full moon arrived on April 16, 2022 at 18:56 UT. Longitudes which were near local solar noon at this time are near 105 West while those at local solar midnight are at 75 East. In the west these include areas of central and western U.S. and Mexico and in the east areas of Central Asia including China, India and Hindu Kush, Afghanistan. These are the areas most likely to see tidal triggering in the next week. Other areas may also see tidal triggering. Such events often concentrate near local solar noon and midnight when solid earth tidal stresses maximize.

 

This area saw some minor activity following major solar flares yesterday as noted in the previous issue of this summary:

 

"The X1.0 flare was followed by the strongest earthquakes of the day - an M 5.7 about an hour later in the Loyalty Islands as well as smaller events in northern Argentina and Chile, Costa Rica, Nicaragua, Southern California, Vanuatu, Chiapas, Mexico and Iceland.  Hair triggering of minor earthquakes by solar flare effects (SFE) can indicate areas which are under stress and may see a moderate to strong earthquake in the near future. Many of these (Mexico, Nicaragua, Costa Rica, Chile, Argentina) are located near 103 degrees from the M 7.0 in the Loyalty Islands of March 31 and may reflect the effects of energy associated with that event as well." (April 20, 2022) 

 

 

The last earthquake in Nicaragua within about 250 km of today's epicenter with equal or larger magnitude occurred on September 5, 2012 with M 7.6 and prior to that an M 7.0 on October 9, 2004.  Forecast 142703 had expected today's event within about 100 km was likely around April 19. This epicenter is near 103 degrees from the M 7.0 in the Loyalty Islands of March 31. Along with events in Central Chile, Mexico, Guatemala, Ecuador, it appears likely to have been promoted by energy from that source.

 

O: 21APR2022 07:42:46  11.7N   86.9W Ml=6.7  EMSC   NEAR COAST OF NICARAGUA      

P: 19APR2022 142703    12.0N   86.0W 3.5-5.3 AAAAA  Nicaragua                  

 

The earthquake in Nicaragua was preceded by a pair of moderate event of M 4.5 and 4.7 near the Panama-Costa Rica border. The last earthquake of larger magnitude in this area was an M 4.8 on February 4, 2022 and prior to that an M 5.2 on September 22, 2021. A strong M 6.7 hit the area on July 21, 2021 and today's event is probably an aftershock of that event. Forecast 142658 had expected this activity within about 25 km was likely in

mid-April.

 

NEIC reported this earthquake of M 4.7 in Panama was felt with intensity II-III in the area(s) of Panama in Puerto Armuelles, Guarumal, Davio and Las Lomas, Chiriqui.

 

O: 20APR2022 22:52:30   8.2N   83.0W ML=4.5  EMSC   PANAMA-COSTA RICA BORDER REGION

O: 20APR2022 23:26:48   8.2N   83.0W mb=4.7  EMSC   PANAMA-COSTA RICA BORDER REGIO

P: 15APR2022 142658     8.0N   83.0W 3.5-5.2 BAAAA  Costa Rica                 

 

An M 5.7 also occurred in the Atacama area of Central Chile today. NEIC reported it with maximum intensity IV in Antofagasta at Calama, Tocopilla and Antofagasta and II in Iquique, Tarapaca. GUC reported this earthquake was felt with intensity  V in  Antofagasta in Calama, Maria Elena, San Pedro de Atacama, Sierra Gorda; IV in Antofagasta, Baquedano, Quillagua, Toconao and Tocopilla and in Tarapaca with IV in El Loa and III in Alto Hospicio and Iquique, Chile. This and the earthquakes in Nicaragua and Panama are located near 104 degrees from the M 7.0 in the Loyalty Islands of March 31 and these were probably promoted by energy from that source. The last earthquake with M>=5.7 within about 200 km of today's epicenter was an M 6.0 on December 14, 2020. Forecasts 142886 and 142884 had expected today's activity within about 100 km was likely in mid-April.

 

 

O: 20APR2022 11:19:06  22.9S   68.3W Mw=5.7  EMSC   ANTOFAGASTA, CHILE           

O: 20APR2022 11:19     22.9S   68.4W mb=5.8  GUC    Antofagasta in Calama, Maria E

P: 13APR2022 142886    23.0S   69.0W 4.0-5.4 CAAAA  Coast No. Chile            

P: 15APR2022 142886    24.0S   68.0W 4.0-5.4 BBAAA  Argentina                  

P: 17APR2022 142884    23.0S   66.0W 4.0-5.6 BBAAA  Argentina                  

 

 

A strong aftershock of M 6.0 also shook Mindanao, Philippines today. NEIC reported it was felt with maximum intensity VIII in Manay, and VII in San Isidro with IV in Tagum, Cancoccian, Davao, Trento and II in Balutakay, Mindanao.

PHIVOLCS reported it was felt with intensity IV in Manay, Mati City, Caraga and San Isidro, Davao Oriental and III in Baganga, Tarragona and Cateel, Davao Oriental; Davao City, Panabo, Davao del Norte and Malungon, Sarangani, Mindanao, Philippines. This appears to be an aftershock of the M 6.1 which hit the area yesterday, April 19. At the time this summary noted in this regard:

 

 

"The strongest earthquakes in the world today were of M 6.1 in Mindanao, Philippines. NEIC reported maximum intensity VIII in Manay and IV in Tagum and Panabo, Southern Mindanao with II-III shaking in Mati, Mawao, Santo Nino, and Davao among others. ... This is an active seismic area. The last earthquake of M>=6.1 within about 100 km of today's epicenter was an M 7.1 on August 11, 2021 and this appears to be the strongest aftershock to date of that event. Forecast 142659 had expected today's event was as likely within about 25 km of this epicenter around April 19." (April 19-20, 2022)

 

 

O: 20APR2022 09:07:40   6.5N  127.0E Mw=5.3  EMSC   PHILIPPINE ISLANDS REGION

O: 20APR2022 16:35:15   6.6N  127.4E mb=4.5  EMSC   PHILIPPINE ISLANDS REGION

O: 20APR2022 22:14:31   6.8N  127.1E ML=4.1  EMSC   PHILIPPINE ISLANDS REGION

O: 20APR2022 14:34:24   7.0N  126.9E mb=4.9  EMSC   MINDANAO, PHILIPPINES

O: 20APR2022 09:20:57   6.2N  127.3E ML=4.2  EMSC   PHILIPPINE ISLANDS REGION    

O: 20APR2022 21:57:43   7.0N  126.9E Mw=6.0  EMSC   MINDANAO, PHILIPPINES        

P: 19APR2022 142659     7.0N  127.0E 4.0-5.4 AAAAA  Halmahera                  

 

A series of moderate to moderately large earthquakes also occurred in Ocean ridges today. These included events of M 5.5 and 5.1 in the Scotia Sea; an M 4.8 and 5.2 in the Tristan da Cunha region of the South Atlantic and an M 5.1 in the Southwest Indian Ridge as well as an M 5.8 in the Balleny Islands. None of these were reported felt in these remote areas.  The M 5.5 and 5.1 in the Scotia Sea between South America and Antarctica is the strongest activity within about 300 km of this epicenter since an M 5.5 on October 22, 2015. The last of larger magnitude was an M 6.0 on February 8, 2014. A major earthquake of M 7.8 hit this area on November 17, 2013 following several strong foreshocks. Today's event is probably an aftershock of that event. Forecast 142911 had expected today's activity within about 150 km of this epicenter was likely around April 19.

 

O: 20APR2022 11:05:37  60.3S   46.9W Mw=5.5  EMSC   SCOTIA SEA

O: 20APR2022 09:22:33  60.3S   46.7W mb=5.1  EMSC   SCOTIA SEA                   

P: 19APR2022 142911    60.0S   44.0W 3.0-5.7 AABAA  So. So. America            

 

A second pair of moderate earthquakes of M 4.8 and 5.2 occurred in the South Atlantic region of Tristan da Cunha today. Like the earthquake of M 6.7 in Nicaragua today, this occurred several hours after the strong solar flare of 02:00 UT and was probably triggered by SFE associated with that event. Many of today's larger events occurred at high latitudes where SFE are prominent. A similar M 5.2 hit within about 300 km of this epicenter in the Tristan da Cunha area on July 28, 2021 but the last event of larger magnitude in this region was an M 5.7 on November 9, 2018. The only event of larger magnitude in the area in the past 30 years was an M 6.0 on September 29, 1993. Forecast 142908 had expected today's event about 100 km to the south was likely around April 14, 2022.

 

O: 21APR2022 06:20:07  43.0S   15.9W mb=4.8  EMSC   TRISTAN DA CUNHA REGION      

O: 21APR2022 06:12:46  43.0S   15.9W mb=5.2  EMSC   TRISTAN DA CUNHA REGION      

P: 14APR2022 142908    44.0S   16.0W 4.0-5.6 CAAAA  So. Mid-Atlantic Ridge      

 

O: 20APR2022 08:04:32  35.4S   53.4E mb=5.1  EMSC   SOUTHWEST INDIAN RIDGE       

P: 13APR2022 142902    33.0S   57.0E 4.0-5.6 CCCAA  So. Indian Ocean           

 

An earthquake of M 5.8 also continued the activity in the Balleny Islands south of New Zealand today. It was not reported felt in this remote area. Today's event follows a n M 5.3 near this epicenter on April 19, 2022. The last earthquake within  the Balleny Islands within about 300 km of this epicenter with equal or greater magnitude was an M 6.2 on December 1, 2020 and an M 6.1 on November 25, 2020.

 

O: 20APR2022 19:13:59  61.2S  154.0E Mw=5.8  EMSC   BALLENY ISLANDS REGION       

 

MODERATELY STRONG QUAKE IN LOYALTY ISLANDS FOLLOWS MAJOR SOLAR FLARE

 

EARTHQUAKE SUMMARY FOR APRIL 19, 2022

 

The strongest earthquake in the world today was an M 5.7 in the Loyalty Islands. This event is an aftershock of the M 7.0 in that region of March 31, the strongest since that event. At the time this summary noted that earthquakes in the Loyalty Islands are often associated with major solar flares as:

 

"A series of major earthquakes including an M 6.9 and 7.0 occurred in the region of the Loyalty Islands today. These were reported by NEIC to have been felt in New Caledonia with V in Tadine, IV in Noumea and III in Bouloupari and in Vila Shefa, Vanuatu. This activity began shortly after an X1.3 class solar flare, the strongest such flare since July 3, 2021" (March 31, 2022)

 

And

 

"The M 7.7 of February 10, 2021 was also associated with a strong solar flare as noted in this summary at the time:

 

 

"A moderate solar flare also occurred at the time of the main activity in the Loyalty Islands with the following parameters. This flare began within about  15 minutes of local solar midnight, a time for maximum Solar Flare Effects (SFE) on seismicity. It is the largest recorded flare since a C1.4 on January 20, 2021 and among the largest of the current year." (February 11, 2011, March 31, 2022)

 

Forecast 142888 had expected today's activity in the Loyalty Islands was likely around April 17.

 

O: 20APR2022 05:13:07  22.8S  170.9E Mw=5.7  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 17APR2022 142888    21.0S  170.0E 4.0-5.4 BBAAA  Loyalty Islands            

 

Antipodal earthquakes occurred today in the Balleny Islands - south of New Zealand -  and in Iceland in the North Atlantic. These may be related to each other or to the recent geomagnetic storm which activated high latitude seismicity. That storm continued today with two near X-class flares. One of these flares began at 03:47 UT coincident with the M 3.3 in Iceland and may have triggered that event. Some of this may preceded larger regional events

 

O: 19APR2022 07:07:10  61.7S  154.5E mb=5.3  EMSC   BALLENY ISLANDS REGION       

 

O: 20APR2022 03:50:26  64.7N   24.2W ML=3.3  EMSC   ICELAND REGION               

P: 13APR2022 142857    63.0N   24.0W 3.0-4.4 CAAAA  Iceland area

 

An earthquake of M 5.8 coincided with the beginning of the M8 flare around 01:28

UT on April 20 and may have been triggered by SFE from that flare. This is the largest earthquake in the Mauritius or Reunion area within about 200 km since an M 5.1 on November 11, 2018. The last o larger magnitude in the area was an M 5.6 on January 5, 2013.

 

O: 20APR2022 01:28:45  20.2S   66.1E mb=5.0  EMSC   MAURITIUS - REUNION REGION   

 

Following are the data for the major flares as indentified by SWPC for today:

               

SOLAR FLARE ACTIVITY

 

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

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

 

7730       2030   2049      2058   M3.7      (April 19, 2022)   2.3E-02  

XXXX       0128   0140      0150   M8.0      (April 20, 2022)   6.0E-02  

XXXX       0357   0415      0420   X1.0      (April 20, 2022)   8.0E-02  

 

Flare 7730 (M3.7) was closely associated with the strongest event in southern

California (M 3.7); and Chiapas and Guerrero, Mexico (M 4.2); The flare around 0100 UT on April 20 was closely associated with an M 2.1 in Ohio, and an unusual M 5.0 at the start of that flare in Mauritius-Reunion in the South Indian Ocean area. The X1.0 flare was followed by the strongest earthquakes of the day - an M 5.7 about an hour later in the Loyalty Islands as well as smaller events in northern Argentina and Chile, Costa Rica, Nicaragua, Southern California, Vanuatu, Chiapas, Mexico and Iceland.  Hair triggering of minor earthquakes by solar flare effects (SFE) can indicate areas which are under stress and may see a moderate to strong earthquake in the near future. Many of these (Mexico, Nicaragua, Costa Rica, Chile, Argentina) are located near 103 degrees from the M 7.0 in the Loyalty Islands of March 31 and may reflect the effects of energy associated with that event as well. 

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 off the coast of Oregon. This event was not reported felt in this area. It is the strongest earthquake off the coast of Oregon within about 100 km of this epicenter since an M 4.7 on October 24, 2021. Forecast 142813 had expected today's event within about 25 km was likely  around April 18.

 

O: 19APR2022 12:43:57  43.3N  126.7W mb=4.0  EMSC   OFF COAST OF OREGON          

P: 18APR2022 142813    43.1N  126.5W 3.0-4.4 AAAAA  Off Coast of Oregon        

 

The swarm of light earthquakes in southern California, described in the previous issue of this summary also continued today. The largest of these of M 3.7 was associated with flare 7730 and, as with the swarm yesterday, occurred near local solar noon and may have been promoted by energy from tidal and geomagnetic effects. Forecast 142767 had expected enhanced seismicity in this area was likely around April 17.

 

NEIC reported these earthquakes of M 3.3 and 3.4, 3.6 and 3.7 in Southern California was felt with intensity II-III in the area(s) of Southern California with IV in Imperial and El Centro and II-III in Brawley, El Centro, Heber, Calexico, Mexicali and Thermal.

 

O: 19APR2022 20:22:40  32.9N  115.5W Mw=3.6  EMSC   SOUTHERN CALIFORNIA

O: 19APR2022 20:30:07  32.9N  115.5W ML=3.7  EMSC   SOUTHERN CALIFORNIA

O: 20APR2022 03:56:46  32.9N  115.5W ML=3.1  EMSC   SOUTHERN CALIFORNIA

O: 20APR2022 05:19:44  32.9N  115.5W ML=3.2  EMSC   SOUTHERN CALIFORNIA

P: 17APR2022 142767    33.7N  116.1W 2.5-4.7 AAAAA  So. California             

 

Unusual earthquakes also occurred in Ohio (M 2.1) and eastern Quebec, Canada today (M 3.0). The event in Ohio occurred in association with a strong solar flare (see above). The last earthquake of M>=2.1 in Ohio was an M 2.4 about 50 km north of this on March 20, 2022. An M 3.0 occurred near today's epicenter on December 12, 2021. Forecasts 142714 and 142747 had expected enhanced seismicity in this region of Ohio around April 19-20.

 

O: 20APR2022 01:08:31  38.7N   83.8W Md=2.1  EMSC   OHIO                         

P: 19APR2022 142814    41.0N   81.0W 2.0-4.1 ACBAA  Ohio/Lake Erie             

P: 20APR2022 142747    35.9N   82.8W 2.0-4.3 ACAAA  Kentucky/Tennessee/NC      

 

The M 3.0 in Eastern Quebec, Canada today was an unusual event. It was not felt in the area but is the first event of M>=3 within about 150 km of this epicenter since an M 4.0 on October 2, 2011. Forecast 142799 had expected enhanced seismicity in this area was likely around April 20.

 

O: 19APR2022 12:58:45  50.6N   64.1W ML=3.0  EMSC   EASTERN QUEBEC, CANADA       

P: 20APR2022 142799    49.3N   67.5W 2.0-4.1 ABBAA  Maine                      

 

An unusual earthquake of M 5.0 also occurred today in the region of Tajikistan. NEIC reported this earthquake of M 5.0 in Tajikistan was felt with intensity II-III in the area(s) of Tajikistan in Garm. This is the strongest earthquake within about 150 km of this epicenter since and M 6.0 on January 19, 2020 more than two years ago. Forecast 142745 had expected activity in this area was likely around April 18. Today's event, like those in Argentina, Chile, Mexico, occurred near 103 degrees from the M 7.0 in the Loyalty Islands of March 31 and may have been promoted by energy from that source.

 

O: 19APR2022 22:44:40  38.9N   70.5E mb=5.0  EMSC   TAJIKISTAN                   

P: 18APR2022 142745    37.0N   70.0E 3.8-5.2 ABAAA  Hindu Kush/Pakistan        

 

 

 

STRONG SEISMICITY NEAR GEOMAGNETIC EQUATOR PROBABLY RELATED TO GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR APRIL 18, 2022

 

A series of moderate to strong earthquakes occurred near the geomagnetic equator and at high latitudes today suggested strong influence by the recent X1.1 flare and geomagnetic storms. Events on the geomagnetic equator included an M 6.1 in Mindanao, Philippines; an M 6.0 in Tonga; an M 5.6 in the Solomon Islands while those at high latitudes included moderate quakes in the Norwegian Sea and in the South Sandwich Islands.  The strong geomagnetic storm has been described in previous issues of this summary as:

 

"...This continues a geomagnetic storm which is the strongest since March 13, 2020, a month ago and could bring renewed and enhanced seismicity near the geomagnetic equator and at high latitudes in the next several days. This was evident by the large number of unusual earthquakes today." (April 14-17, 2022)

 

The strongest earthquakes in the world today were of M 6.1 in Mindanao, Philippines. NEIC reported maximum intensity VIII in Manay and IV in Tagum and Panabo, Southern Mindanao with II-III shaking in Mati, Mawao, Santo Nino, and Davao among others. PHIVOLCS reported it was felt with intensity IV in Manaym Mati City, Tarragona and Lupon, Davao Oriental; Hunatuan, Surigao Del Sur; Bislig City and III in Don Marcelino, Davao Occidental; Cateel and Baganga, Davao Oriental, Tandag City, Surigao Del Sur, Davao City, Malungon, Sarangani, Maco, Philippines. This is an active seismic area. The last earthquake of M>=6.1 within about 100 km of today's epicenter was an M 7.1 on August 11, 2021 and this appears to be the strongest aftershock to date of that event. Forecast 142659 had expected today's event was as likely within about 25 km of this epicenter around April 19.

 

 

O: 19APR2022 04:24:33   7.2N  127.0E Mw=5.2  EMSC   PHILIPPINE ISLANDS REGION

O: 19APR2022 02:26:34   7.3N  127.1E mb=4.7  EMSC   PHILIPPINE ISLANDS REGION

O: 19APR2022 05:56:24   7.3N  127.1E ML=4.8  EMSC   PHILIPPINE ISLANDS REGION

O: 19APR2022 06:08:42   7.3N  127.1E mb=5.0  EMSC   PHILIPPINE ISLANDS REGION

O: 19APR2022 01:23:08   7.2N  126.9E Mw=6.1  EMSC   MINDANAO, PHILIPPINES        

P: 19APR2022 142659     7.0N  127.0E 4.0-5.4 AAAAA  Halmahera                  

 

An M 5.9-6.0 also occurred today in central Tonga. NEIC reported it was felt with maximum intensity IV in Tongatapu, Tonga at Haveloloto and Nuku'alofa and III in Tofoa-Koloua. The last earthquake of M>=6 within about 200 km of this epicenter was an M 6.1 on June 15, 2019. An M 6.4 hit about 200 km north of this epicenter on October 1, 2020 as well. Forecast 142894 had expected today's event within about 150 km was likely in mid-April.

 

O: 19APR2022 04:33:41  21.4S  174.0W Mw=6.0  EMSC   TONGA                         

P: 13APR2022 142894    20.0S  174.0W 4.0-5.6 CBAAA  Tonga Islands              

 

In addition to the M 6.0 in Tonga several other moderate to moderately large earthquakes shook the region of the Southwest Pacific. The largest of these was an M 5.6 in the southern Solomon Islands followed by an M 5.3 in the Santa Cruz Islands about 400 km to the east. These events occurred near local solar noon and may have been promoted by high tidal stresses which maximize near this hour. Forecast 142881 had expected this activity in mid-April. In addition to an M 5.0 in the northern Solomon Islands, these events are located on the geomagnetic equator and were also probably promoted by the strong X-flare yesterday and the recent geomagnetic storm.
 

O: 19APR2022 00:20:48  10.8S  166.1E Mw=5.3  EMSC   SANTA CRUZ ISLANDS           

P: 13APR2022 142881    12.0S  166.0E 4.0-5.6 CBAAA  Vanuatu Islands            

 

O: 18APR2022 23:33:34  11.3S  162.7E Mw=5.6  EMSC   SOLOMON ISLANDS              

P: 19APR2022 142881    11.0S  162.0E 4.0-5.5 AAAAA  Vanuatu Islands            

 

O: 18APR2022 21:56:12   8.9S  157.9E mb=5.0  EMSC   SOLOMON ISLANDS              

P: 14APR2022 142871    10.0S  160.0E 4.0-5.6 BBBAA  No. of Santa Cruz Islands  

 

Earthquakes of M 4.8 in the South Sandwich Islands and of M 4.3 in the Norwegian Sea were included in today's high latitude seismic enhancement. The activity in the South Sandwich Islands is not unusual for this area at this time as enhanced seismicity has been common in this area for months. Forecast 142910 had expected today's event within about 100 km was likely around April 15.

 

O: 18APR2022 09:06:49  58.9S   25.4W mb=4.8  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 15APR2022 142910    58.0S   26.0W 4.0-5.8 BAAAA  So. Sandwich Islands        

 

The only event in the Norwegian Sea in the past year within about 250 km  of today's epicenter was an M 4.8 on September 13, 2021. Forecast 142864 had expected enhanced seismicity in this area was likely around April 18.

 

O: 18APR2022 21:20:52  73.4N   10.2E mb=4.3  EMSC   NORWEGIAN SEA                

O: 18APR2022 21:20:53  73.5N   10.5E mb=4.3  ANSS   Norwegian Sea                

P: 18APR2022 142864    71.0N    7.0W 3.5-5.3 AAAAA  Jan Mayen Isl. area        

 

An M 5.3 was located in eastern Honshu near Daigo, Japan today. This is a regional aftershock of the M 7.3 that occurred on March 16 about 200 km to the northeast of today's epicenter. Forecast 142761 had expected today's event within about 100 km was likely around April 16.

 

O: 18APR2022 23:16:00  37.0N  140.4E mw=5.3  ANSS  NNE of Daigo Japan            

P: 16APR2022 142761    37.0N  142.0E 4.0-5.5 AAAAA  Off East Coast Honshu      

 

A series of light earthquakes were felt near the Baja-Southern California border today. These included an M 3.3 felt with intensity II in Delta, Baja California and El Centro, California among others. An earthquake of M 4.1 also occurred southeast of this epicenter in the northern Gulf of California today and was accompanied by earthquakes of M 3.4, 3.6, 3.7 among others. The M 3.4  in Baja California occurred within minutes of local solar noon and was probably promoted by high tidal stresses which maximize near this hour. Forecast 142765 and expected this activity within about 50 km was likely around April 16. This activity is located at 103-104 degrees from the M 6.9 in Qinghai, China of January 7, 2022 and at the fourth node (90 degrees) from the M 7.0 in the Loyalty Islands of March 31 and was probably promoted by energy from those sources.

 

O: 18APR2022 09:10:57  30.2N  113.7W ML=3.6  EMSC   GULF OF CALIFORNIA

O: 19APR2022 05:57:48  30.2N  113.7W ML=4.1  EMSC   GULF OF CALIFORNIA

O: 18APR2022 09:18:42  30.3N  113.7W ML=3.6  EMSC   GULF OF CALIFORNIA

O: 18APR2022 08:59:09  30.2N  113.8W ML=3.7  EMSC   GULF OF CALIFORNIA           

O: 18APR2022 18:39:22  31.3N  114.4W ML=3.6  EMSC   GULF OF CALIFORNIA           

P: 16APR2022 142765    31.9N  116.3W 2.5-4.5 AAAAA  So. California             

 

O: 18APR2022 19:53:52  31.6N  115.9W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO      

O: 18APR2022 21:13:13  32.3N  115.2W Ml=2.2  EMSC   BAJA CALIFORNIA, MEXICO

O: 18APR2022 22:22:12  32.4N  115.3W ML=2.9  EMSC   BAJA CALIFORNIA, MEXICO

O: 18APR2022 22:35:33  32.4N  115.2W ML=3.1  EMSC   BAJA CALIFORNIA, MEXICO

O: 18APR2022 23:30:49  32.4N  115.2W Ml=2.5  EMSC   BAJA CALIFORNIA, MEXICO

O: 19APR2022 00:27:35  32.4N  115.3W ML=2.7  EMSC   BAJA CALIFORNIA, MEXICO

O: 18APR2022 23:18:42  32.0N  116.8W ML=2.1  EMSC   BAJA CALIFORNIA, MEXICO      

P: 16APR2022 142765    31.9N  116.3W 2.5-4.5 AAAAA  So. California             

 

MODERATELY STRONG QUAKE IN VANUATU

 

EARTHQUAKE SUMMARY FOR APRIL 17, 2022

 

The strongest earthquake in the world today was an M 6.1 in central Vanuatu. NEIC reported it was felt with intensity II in Loganville, Sanma, Vanuatu. This event lies near the geomagnetic equator and may have been promoted by strong stresses associated with the recent geomagnetic storm and the full moon as noted in previous issues of this summary:

 

 

"...This continues a geomagnetic storm which is the strongest since March 13, 2020, a month ago and could bring renewed and enhanced seismicity near the geomagnetic equator and at high latitudes in the next several days. This was evident by the large number of unusual earthquakes today." (April 14-17, 2022)

 

and

 

"The full moon arrived on April 16, 2022 at 18:56 UT. Longitudes which were near local solar noon at this time are near 105 West while those at local solar midnight are at 75 East. In the west these include areas of central and western U.S. and Mexico and in the east areas of Central Asia including China, India and Hindu Kush, Afghanistan. These are the areas most likely to see tidal triggering in the next week. Other areas may also see tidal triggering. Such events often concentrate near local solar noon and midnight when solid earth tidal stresses maximize." (April 14-16, 2022)

 

More enhanced seismicity at high latitudes and near the geomagnetic equator is still expected in the next two days. This could include one or more strong events. Today's event of M 6.1 follows an M 6.3 about 150 km to the southwest of this that occurred on April 9, 2022 and is the strongest event within this area  since an M 6.9 to the north of this on August 18, 2021, the only such event in the past year. Forecast 142882 had expected today's event within about 25 km was likely around April 17.

 

O: 17APR2022 07:46:36  15.7S  167.9E Mw=6.1  EMSC   VANUATU                      

P: 17APR2022 142882    16.0S  168.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

A moderate earthquake of M 4.4 shook the region of western Australia today. This is the strongest earthquake within about 100 km of this epicenter since an M 4.5 on October 7, 2015, the only such earthquake in this area in the past 30 years at least. This earthquake may have been triggered by Solar Flare Effects associated with an X1.1 class flare (#7140), one on only three other X-class flare in the past 1.5 years - an X1.3 occurred on March 30, 2022 and an X1.0 occurred on October 28, 2021 and an X1.5 on July 3, 2021. The parameters of this flare as given by SWPC are:

 

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

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

 

7140       0317   0334      0351   X1.1      (April 17, 2022)   1.4E-01  

 

This flare maximized within minutes of local solar noon at the epicenter of the event in Western Australia and may have triggered this earthquake which occurred an hour later.

 

O: 17APR2022 04:34:49  17.4S  121.6E mb=4.4  EMSC   WESTERN AUSTRALIA            

 

A highly unusual earthquake also occurred today east of northern Chile in the southeast Central Pacific Ocean area. It was not reported felt in this remote area. It occurred within minutes of the time of the full moon in the area and was probably promoted by high tidal stresses which maximize near this hour (see tidal forecast above). No earthquakes of any magnitude have been located within about 400 km of this epicenter in the past 30 years.

 

O: 17APR2022 23:31:22  25.7S   84.2W mb=4.5  EMSC   SOUTHEAST CENTRAL PACIFIC OCEA

 

MODERATE QUAKES IN LOYALTY ISLANDS; MEDITERRANEAN SEA

 

EARTHQUAKE SUMMARY FOR APRIL 16, 2022

 

The strongest earthquake in the world today was an M 5.3-5.4 in the area of the

Loyalty Islands. This earthquake was not reported felt in this remote area. It is the strongest aftershock in the area of a mainshock of M 7.0 on March 31 since an M 5.5 on April 2. Forecast 142888 had expected this activity was likely around April 14.

 

O: 16APR2022 21:57:37  22.3S  170.7E Mw=5.3  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 14APR2022 142888    22.0S  171.0E 4.0-5.4 AAAAA  Loyalty Islands            

 

A similar M 5.4-5.6 was felt in the Biak region of Indonesia today. BMG reported

this earthquake was felt with intensity III in Yapen, Biak, Mamberaino,  Waropen, and II in Paniai, Puncak Jaya, Nabire, Sarmi, Jayam Tolisara, Supiori among others. Forecast 142423 had expected today's event within about 50 km was likely in early April. This event is the strongest within the Biak region of Indonesia within about 150 km of this epicenter since an M 5.9 on January 1, 2021 and an M 5.5 on March 25, 2017.  This earthquake and the M 5.3 in the Loyalty Islands occurred near the geomagnetic equator and may have been promoted by energy associated with the current geomagnetic storms.

 

O: 17APR2022 05:49:27   1.4S  136.9E Mw=5.4  EMSC   BIAK REGION, INDONESIA       

O: 17APR2022 05:49:27   1.4S  136.9E Mw=5.6  BMG    BIAK REGION, INDONESIA       

P:  7APR2022 142423     1.0S  137.0E 4.0-5.4 CAAAA  West Irian, PNG            

 

An M 5.0 occurred today in the Central Mediterranean Sea south of Greece. This is the largest earthquake within about 200 km of this epicenter since an M 6.0 on November 27, 2019 and an M 5.1 on December 18, 2021. Forecast 142754 had expected this activity within about 50 km was likely around April 13.

 

O: 16APR2022 17:00:40  35.9N   22.5E mb=5.0  EMSC   CENTRAL MEDITERRANEAN SEA    

P: 13APR2022 142754    36.0N   22.0E 3.0-4.5 BAAAA  No. Greece                 

 

The strongest earthquake in the U.S. or Canada or vicinity today occurred in Baja California with M 3.8. NEIC reported this earthquake of M 3.8 in Baja California was felt with intensity II-III in the area(s) of Baja California in Lazaro Cardenas (IV), Maneadero, Ensenada, El Sauzal, Reacomodo, Primo Tapia, Mexicali and in Southern California at Tecate. This is part of a continuing series in this region which has recently included an M 4.8 north of this on March 31. Forecast 142765 had expected today's event within about 50 km was likely around April 16.

 

O: 17APR2022 05:38:25  31.7N  115.9W Mw=3.8  EMSC   BAJA CALIFORNIA, MEXICO      

P: 16APR2022 142765    31.9N  116.3W 2.5-4.5 AAAAA  So. California             

 

A pair of light earthquakes also occurred today in southern Texas with M 3.2 and 2.7. NEIC reported this earthquake of M 3.2 in Southern Texas was felt with intensity II-III in the area(s) of Southern Texas in Cypress.  This continues a series which last saw a minor earthquake in the area an M 2.6 on March 23, 2022. The last earthquake of M>=3.2 in this area was an M 3.2 on December 21, 2021.  

Forecast 142720 had expected today's event in this area was likely around April 18. This earthquake may have been promoted by high tidal stresses with the current full moon as described in this and previous issues of this summary:

 

"The full moon arrived on April 16, 2022 at 18:56 UT. Longitudes which were near local solar noon at this time are near 105 West while those at local solar midnight are at 75 East. In the west these include areas of central and western U.S. and Mexico and in the east areas of Central Asia including China, India and Hindu Kush, Afghanistan. These are the areas most likely to see tidal triggering in the next week. Other areas may also see tidal triggering. Such events often concentrate near local solar noon and midnight when solid earth tidal stresses maximize." (April 14-16, 2022)

 

This epicenter is located at 102 degrees from the M 7.0 in the Loyalty Islands of March 31 and may have been promoted by energy from that source. Other earthquakes today at this distance from the Loyalty Islands today occurred in Coquimbo, Chile, Oaxaca, Mexico.

 

O: 17APR2022 05:00:15  28.9N   98.1W mb=2.7  EMSC   SOUTHERN TEXAS

O: 17APR2022 00:45:50  28.9N   98.1W ML=3.2  EMSC   SOUTHERN TEXAS                

P: 18APR2022 142720    28.0N   98.0W 3.0-4.5 AAAAA  Northern Mexico            

 

MODERATE QUAKES SHAKE VANUATU AND ANTOFAGASTA, CHILE

 

EARTHQUAKE SUMMARY FOR APRIL 15, 2022

 

The strongest earthquake in the world today was an M 5.3-5.4 in Vanuatu. NEIC reported it was felt with intensity VIII in Vila Shefa, Vanuatu. This earthquake is the strongest within about 200 km of this epicenter since an M 6.0 on April 4, 2022 and is probably an aftershock of that event. An M 5.8 hit near today's earthquak of February 20, 2021 following an M 6.2 on February 16, 2021 and may have been related regional volcanism.  Forecasts 142618 and 142882 expected enhanced seismicity in central Vanuatu in mid-April.

 

O: 15APR2022 14:22:42  17.4S  168.7E Mw=5.4  EMSC   VANUATU                      

P: 10APR2022 142618    18.0S  168.0E 4.0-5.4 BAAAA  Vanuatu Islands            

P: 17APR2022 142882    16.0S  168.0E 4.0-5.4 ABAAA  Vanuatu Islands            

 

An earthquake of M 5.3-5.4 also occurred today in northern Chile in the area of

Antofagasta. This is the strongest earthquake in the region of Antofagasta since an M 6.0 on December 14, 2020.  Forecast 142886 had expected today's event within about 100 km was likely around April 13.  GUC reported this earthquake was felt with intensity V in  Antofagasta in Calama; IV in Antofagasta, Maria Elena, Mejillones, Tocopilla and II in Ollague and Quillagua and in Tarapaca with II in Alto Hospicio and Iquique, Chile. NEIC reported this earthquake of M 5.0 in Northern Chile was felt with intensity II-III in the area(s) of Northern Chile in Antofagasta and Iquique, Tarapaca. This earthquake along with an M 5.0 in El Salvador, an M 5.0 in the South Sandwich Islands and an M 3.0 in Kansas, among others occurred near 103 degrees from the M 7.0 in the Vanuatu Islands of March 31 and may have been promoted by energy from that source.

 

O: 15APR2022 16:43:31  22.8S   69.8W mb=5.4  EMSC   ANTOFAGASTA, CHILE           

O: 15APR2022 10:02:13  22.5S   68.7W mb=4.4  EMSC   ANTOFAGASTA, CHILE

O: 15APR2022 16:43     22.7S   69.9W mb=5.1  GUC    Antofagasta in Calama; IV in A

P: 13APR2022 142886    23.0S   69.0W 4.0-5.4 AAAAA  Coast No. Chile            

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in Hawaii. NEIC reported it was felt with maximum intensity IV in Hawaii at Pahala, Naalehu, Volcano and II-III in Hawaii National Park, Pahoa, Captain Cook, Mountain View, Hilo, Kurtistown, and Holualoa among others. A foreshock of M 4.3 preceded the M 4.6 seconds earlier. It was reported with intensity VI in Pahala along with similar intensities as the later event. This event is the strongest in Hawaii since an M 4.9 on December 24, 2021 and an M 6.2 on October 10, 2021.

It may have been promoted by strong tidal stresses as it occurred near local solar midnight when these stresses maximize. Forecast 142695 had expected  enhanced seismicity in Hawaii around April 14.

 

O: 15APR2022 12:11:13  19.2N  155.4W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 15APR2022 11:58:24  19.3N  155.5W mb=4.6  EMSC   ISLAND OF HAWAII, HAWAII     

P: 14APR2022 142695    18.8N  155.2W 3.0-4.5 AAAAA  Hawaii                     

 

An M 2.6 earthquake occurred off the southern Coast of Bar Harbor, Maine today. NEIC reported it was felt with intensity II in Maine at Bar Harbor, Cranberry Isles and Winter Harbor. This is the strongest earthquake within about 100 km of this epicenter since an M 2.6 about 100 km to the east of this on February 10, 2021. The last earthquakes in the area of greater magnitude occurred in late 2006 following an M 3.4 on September 22, 2006. Forecast 142791 had expected enhanced seismicity in this region was likely around April 15.

 

O: 16APR2022 02:10:49  44.0N   67.6W ML=2.6  EMSC   GULF OF MAINE                

P: 15APR2022 142791    46.0N   66.0W 2.0-4.3 ABAAA  E. of Maine                

 

MODERATE EARTHQUAKES REPORTED OFF SOUTHERN AND BAJA CALIFORNIA

 

EARTHQUAKE SUMMARY FOR APRIL 14, 2022

 

The strongest earthquake in the U.S. or Canada and vicinity today was an M 4.6 in Baja California. NEIC eported it was felt with maximum intensity IV in Baja California at Maneadero, Rosarito, La Joya and II-III in El Sauzal, Ensenada, Primo Tapia, Tijuana, and in southern California in San Diego, San Isidro and Imperial Beach. This is the strongest earthquake within about 100 km of this epicenter since an M 4.6 on February 14, 2010 and an M 4.6 on June 13, 2006 both about 100-150 km to the east of today's epicenter. No earthquake of larger magnitude have occurred in this area in at least 30 years.  Forecast 142766 had expected today's event within about 50 km was likely around April 13. This may be related to an M 5.3 in the Southwest Indian Ridge, the largest earthquake in the world yesterday as reported in this summary:

 

"The strongest earthquake in the world today was an M 5.3 in the Southwest Indian Ridge in the southern Indian Ocean. This is the strongest earthquake within about 300 km of this epicenter since an M 5.4 on January 29, 2017. The last of significantly larger magnitude in this area was an  M 5.7-5.9 on August 16, 2006. The antipode of this epicenter is in the northern Gulf of California/Baja California area at 28N 117W which may see minor seismic enhancement in the next several days." (April 14-15, 2022)

 

This epicenter is located at 102 degrees from the M 6.9 in northern Qinghai China of January 7, 2022 and the M 5.6 there today and may have been promoted by energy from that source. It is also located at the fourth node from the  M 7.0 earthquake in the Loyalty Islands of March 31. Other earthquakes today at this distance from the Loyalty Islands included an M 5.6 in northern Qinghai, China and an M 4.1 in Siberia and an M 3.6 in Northern Alaska, events which may have been promoted by energy from the Loyalty Islands.

 

O: 15APR2022 04:30:52  31.8N  117.0W Mw=4.6  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O: 15APR2022 04:30:52  31.9N  116.9W Mw=4.6  ANSS   OFFSHORE BAJA CALIFORNIA, MEXI

P: 13APR2022 142766    32.4N  117.2W 2.5-4.4 AAAAA  So. California             

 

A report of an M 4.0 off southern California today triggered automatic alarms. The USGS later announced this was a non-earthquake event. This is one danger of such automatic alarms which have no initial manual or human analysis.

 

An M 5.0 occurred in the south Atlantic today in the Bouvet Island region. This is the strongest earthquake within about 300 km of this epicenter since an M 5.2 on August 14, 2019 and an M 5.8 on August 28, 2020. The antipode of this epicenter is in the Rat Islands, Aleutians. An earthquake of M 5.7 occurred at this antipode in the Rat Islands on April 9, and energy from this source may have helped promote today's event. Forecast 142909 had expected today's event in the Bouvet Island region was likely within about 150 km around April 19. The Rat Islands event had been noted in this summary at the time as:

 

"The strongest earthquake in the U.S. or Canada today was an M 5.7 in the region of the Rat Islands, Alaska. It was reported lightly felt in Alaska. This event is the strongest in the Rat Islands, Alaska since an M 6.4 more than three years ago on April 2, 2019 and prior to that an M 6.6 on October 8, 2017." (April 10, 2022)

 

This epicenter is located at 102 degrees from the M 7.0 in the Loyalty Islands of March 31, 2022 and may have been promoted by energy from that source.

 

O: 14APR2022 09:27:14  55.4S    1.8W mb=5.0  EMSC   BOUVET ISLAND REGION         

P: 19APR2022 142909    55.0S    2.0E 4.0-5.6 BABAA  Atlantic-Indian Ridge      

 

The strongest earthquake in the world today was an M 5.6 in Northern Qinghai, China.  It was probably felt with moderate intensity in this remote area but this has not been reported by NEIC. This appears to be an aftershock of similar events of M 5.6 and M 5.7 on January 23 and March 25, 2022. At that time his summary noted in this regard:

 

 

"The strongest earthquake in the world today was an M 5.7 in the region of Northern Qinghai, China. This is a regional aftershock of the M 6.9 in Qinghai of January 7, 2022. It occurred about 400 km northwest of that earlier epicenter. No major damage was reported with this earthquake. The last earthquake of M>=5.7 within about 200 km of this epicenter occurred as an M 6.3 about 200 km to the southwest of this epicenter on August 27, 2009. The only event within 150 km of this epicenter with M>=5.7 in the past 30 years was an M 5.9 about 150 km east of this on October 26, 1993. Today's earthquake was followed by moderate aftershocks of M 5.1 and 5.0 among others. The mainshock occurred within about an hour of local solar midnight and may have been promoted by tidal stresses which maximize near this hour." (March 26, 2022)

 

Like the event in March, today's earthquake also occurred within a day of the full moon and may have been promoted by high tidal stresses. Forecast 142772 had expected enhanced seismicity in this area at this time.

 

O: 15APR2022 01:26:16  38.5N   97.3E mb=5.6  EMSC   NORTHERN QINGHAI, CHINA      

O: 15APR2022 01:26:14  38.5N   97.3E mb=5.4  CENC   NORTHERN QINGHAI, CHINA      

P: 13APR2022 142772    39.0N  100.0E 3.5-5.1 AACAA  So. China                  

 

An unusual earthquake occurred south of China in Vietnam with M 4.3 today.

NEIC reported this earthquake of M 4.3 in Vietnam was felt with intensity II-III in the area(s) of Vietnam in Danang. The last earthquake located in Vietnam in the past two years was an M 4.5 in northern Vietnam about 800 km northwest of today's epicenter on March 14, 2022. The only similar earthquake within about 300 km of today's epicenter in Vietnam in the past 30 years was an M 4.3-4.4 on January 27, 2017.  That earthquake occurred with the new moon and, like today's may have been promoted by high tidal stresses. Today's event occurred within about an hour or local solar midnight, a time when tidal stresses maximize. Earthquakes in this area are often triggered by cyclones making landfall in the central Philippines and this may be the case here. TS Malakas has hit the eastern Philippines directly east of today's Vietnam epicenter several days ago as noted in this summary:

 

"TS Malakas (TD 02W) continued today in the area east of the Central Philippines with winds up to 75 kts. It is expected to track to the west and north becoming a major storm in several days. Seismicity the region of the Bonin Islands to the Volcano Islands may be affected by stresses associated with this storm." (April 10, 2022)

 

It is also at the fifth node (72 degrees) from the M 7.0 in the Loyalty Islands of March 31 and may have been promoted by energy from that source.

 

O: 14APR2022 17:43:24  15.0N  108.2E mb=4.3  EMSC   VIETNAM                      

 

An unusually larger M 4.5 occurred today in Sicily, Italy. This is possibly related to the current eruption of Mt. Etna on Sicily. The last earthquake of equal or larger

 magnitude within about 150 km of this epicenter was an M 4.5 on December 22, 2020 and prior to that an M 5.0 on December 26, 2018. Forecast 142749 had expected this activity around April 15.

 

NEIC reported this earthquake of M 4.5 in Sicily, Italy was felt with intensity II-III in the area(s) of Sicily, Italy in Syracuse, Sant-Agata Li Battiati, Motta Sant Anastasia, Scordia, Modica and in Gharghur, Malta.

 

O: 15APR2022 01:34:39  37.3N   15.8E mb=4.5  EMSC   SICILY, ITALY                

P: 15APR2022 142749    39.0N   14.0E 3.0-4.9 ABBAA  Mediterranean/Sicily       

 

A similar earthquake of M 4.4 in the Mediterranean Sea today occurred near the eastern shore. This is an unusual earthquake. The last within about 100 km of this epicenter of equal or larger magnitude was an M 4.7 on October 19, 2016. A strong M 6.6 hit the region about 200 km east of this on January 11, 2022 and this may be a regional aftershock of that event. On January 11, this summary noted in regard to the M 6.6:

 

 

"The strongest earthquake in the world today was an M 6.6 in the region of Cyprus south of Turkey. NEIC reported it was felt with intensity VI in Cyprus at Polis, Skouli, Argarka; V in Kossonerga; IV in Regeia, Giolou, Tala, Chiorakas, Lempa, Cyprus. Minor damage accompanied major concern with shaking that lasted for a long period according to press accounts. This is the strongest earthquake near Cyprus within about 250 km since an M 6.8 on October 9, 1996, the only other such event in the area in at least 30 years." (January 11, 2022)

 

Forecasts 142778 and 142777 had expected regional seismic enhancement was likely in western Turkey and the eastern Mediterranean around April 14-17. This epicenter is at 144 degrees from the M 7.0 in the Loyalty Islands of March 31, 2022 and may have been promoted by energy from that source.

 

O: 14APR2022 13:36:10  35.6N   30.1E mb=4.4  EMSC   EASTERN MEDITERRANEAN SEA    

P: 14APR2022 142778    37.0N   29.0E 3.5-4.9 ABAAA  Turkey                     

P: 17APR2022 142777    34.0N   32.0E 3.5-5.0 BBBAA  Turkey                     

 

MAJOR SOLAR STORM MAY ENHANCE SEISMICITY

 

EARTHQUAKE SUMMARY FOR APRIL 13, 2022

 

SWPC expects a major solar storm to hit the earth environment on April 14. This could bring a strong to major earthquake in the next several days. This is most likely at high latitudes or near the geomagnetic equator, in areas such as Indonesia and the southwest Pacific and Alaska through northern Europe and Kamchatka to the Aleutians. This is most likely to begin late in the UT day.  Disruptions to satellites and induced currents in the earth are also possible with storms such as this.

 

The strongest earthquake in the world today was an M 5.3 in the Southwest Indian Ridge in the southern Indian Ocean. This is the strongest earthquake within about 300 km of this epicenter since an M 5.4 on January 29, 2017. The last of significantly larger magnitude in this area was an  M 5.7-5.9 on August 16, 2006. The antipode of this epicenter is in the northern Gulf of California/Baja California area at 28N 117W which may see minor seismic enhancement in the next several days. Forecast 142892 had expected today's event in this region was likely in mid-April.

 

O: 13APR2022 19:13:01  27.8S   63.9E Mw=5.3  EMSC   SOUTHWEST INDIAN RIDGE       

P: 19APR2022 142892    29.0S   62.0E 4.0-5.4 CBBAA  So. Indian Ocean           

 

An M 4.8 occurred today in the region of Crete, Greece. NEIC reported it was felt with maximum intensity IV in Timbakion, Iraklion and II-III in Rethimnon and Yerani, Hania, Greece. Crete has been seismically active in the past four months following an M 5.7 on December 29, 2021. Today's event appears to be the largest aftershock in this area since the events of late December, 2021 (an M 4.5 also hit the area on March 16, 2022). Forecast 142729 had expected today's earthquake in this region was likely around April 13. This epicenter is at 147 degrees from the Loyalty Islands M 7.0 of March 31 and may have been promoted by energy from that source.

 

O: 13APR2022 19:35:49  34.6N   24.7E ML=4.5  EMSC   CRETE, GREECE                 

P: 13APR2022 142729    36.0N   23.0E 3.0-4.5 ABBAA  Aegean Sea                 

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 in the Alaska

Peninsula.  NEIC reported this earthquake of M 4.2-4.8 in the Alaska Peninsula was felt with intensity II-III in the area(s) of the Alaska Peninsula at Sand Point. This is the strongest earthquake in the Alaska Peninsula since an M 5.2 on February 20, 2022. Two light foreshocks occurred south of this epicenter on April 12. Forecasts 142826 and 142845 had expected today's activity within about 100 km was likely around April 15-16.

 

O: 13APR2022 14:23:07  55.2N  160.2W mb=4.8  EMSC   ALASKA PENINSULA             

P: 15APR2022 142826    54.8N  158.7W 3.5-4.9 AAAAA  Alaska Peninsula           

P: 16APR2022 142845    54.5N  161.8W 3.5-4.9 BAAAA  Unimak Islands, Aleutians  

 

A swarm of light earthquakes occurred in Western Australia today. The largest of these was an M 2.4. Forecast 142631 had expected regional enhancement of seismicity in this area in early April.

 

O: 13APR2022 20:56:56  33.4S  117.0E ML=2.4  EMSC   WESTERN AUSTRALIA            

P:  4APR2022 142631    30.0S  117.0E 2.0-3.8 CCAAA  Central Australia          

 

 

 

 

 

STRONG SEISMICITY RETURNS TO SOUTHWEST PACIFIC

 

EARTHQUAKE SUMMARY FOR APRIL 12, 2022

 

The largest earthquakes in the world today occurred in the Southwest Pacific with an M 5.9 in New Britain and an M 5.5 in Vanuatu minutes earlier.  The strongest earthquake in the world today was an M 5.9 in the region of New Britain, Papua New Guinea. NEIC reported it was felt with intensity IV in Rabaul, New Britain. The last earthquake of larger magnitude in New Britain within about 200 km of today's epicenter was an M i6.3 on November 30, 2021 and an M 6.1 on August 24, 2020. Forecast 142672 had expected today's event within about 100 km was likely in New Britain around April 15.

 

O: 13APR2022 03:00:55   4.4S  152.0E Mw=5.9  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 15APR2022 142672     4.0S  153.0E 4.0-5.4 AAAAA  New Britain                

 

The earthquake in New Britain followed about 30 minutes after an M 5.5 in northern Vanuatu and may have been promoted by energy from that event. It was reported by NEIC to have been felt in Vila Shefa, Vanuatu. A strong M 6.0 last occurred in northern Vanuatu on January 3, 2022 within about 150 km of today's epicenter. An M 6.0 hit south of this in Central Vanuatu on March 23, 2022. Forecast 142881 had expected today's event was likely in northern Vanuatu around April 13.

 

O: 13APR2022 02:31:59  13.8S  166.8E Mw=5.5  EMSC   VANUATU                      

P: 13APR2022 142881    12.0S  166.0E 4.0-5.6 ABAAA  Vanuatu Islands            

 

An earthquake of M 5.6-5.7 also occurred in the Japanese Ryukyu Islands today. NEIC reported it was strongly felt with intensity VIII in Nago, Okinawa. This is the strongest shock in the current swarm in this region which began with an

M 5.6 on March 17. Earthquakes of larger magnitude within about 100 km of this epicenter occurred on March 2, 2014 with M 6.5 and with M 6.0 on August 7, 2007. Forecast 142723 had expected today's activity was likely within about 50 km

around April 16.

 

O: 13APR2022 06:14:42  26.8N  126.4E mb=4.6  EMSC   RYUKYU ISLANDS, JAPAN

O: 13APR2022 01:22:33  26.9N  126.4E Mw=5.7  EMSC   RYUKYU ISLANDS, JAPAN

O: 13APR2022 00:49:48  27.0N  126.3E mb=4.6  EMSC   RYUKYU ISLANDS, JAPAN

O: 13APR2022 00:57:26  27.0N  126.4E mb=4.4  EMSC   RYUKYU ISLANDS, JAPAN

O: 12APR2022 10:46:43  26.8N  126.4E Mw=4.9  EMSC   RYUKYU ISLANDS, JAPAN        

P: 16APR2022 142723    27.0N  127.0E 4.0-5.5 BAAAA  Ryukyu Islands             

 

An unusual earthquake of M 5.0 was also felt in Namibia today. NEIC reported maximum shaking V in Khorixas and IV in Otjiwarongo with II-III shaking in Swakopmund and Outjo, Namibia.

The largest recent earthquake in Namibia occurred with M 5.4 a year ago on

April 4, 2021 and was followied by an M 5.0 on May 24, 2021. These occurred

within about 50 km of today's epicenter. At the time of the M 5.4 this summary

noted:

 

 

"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." (April 4, 2021)

 

O: 12APR2022 20:36:15  20.1S   15.0E mb=5.0  EMSC   NAMIBIA                      

 

The earthquake in Namibia followed an M 4.3 in Mozambique, Southern Africa. This may be an aftershock of an M 4.6 within about 100 km of this epicenter which occurred on March 15, 2022. At the time this summary noted:

 

"An unusual earthquake also occurred in the Mozambique Channel today. It was not reported felt in this area. The last earthquake of M>=4.6 within about 250 km of this epicenter was an M 4.7 on November 27, 2016. A series of moderate earthquakes in this region occurred in June and September 2006 culminating with an M 5.6 on September 24, 2006." (March 15, 2022)

 

Forecast 142604 had expected today's event within about 150 km was likely in early April.

 

O: 12APR2022 09:57:03  16.7S   40.8E mb=4.3  EMSC   MOZAMBIQUE                   

P:  6APR2022 142604    18.0S   42.0E 3.0-4.6 CBAAA  Madagascar area            

 

A series of earthquakes today followed an M 4.2 in Iceland. This activity, while not reported felt, may be associated with renewed volcanism in the area.

 Most recently earthquakes of M 3.1 occurred about 100 km east of this on April 4 and M 4.4 at that same epicenter on March 3, 2022. The last significant activity within this area of today's activity last occurred on  with M 4.9 on December 22, 2021 after a major outbreak followed an M 5.6 on February 24, 2021. Forecast 142857 had expected today's activity within about 50 km was likely around April 13. 

 

O: 12APR2022 21:36:55  63.8N   24.3W ML=3.4  EMSC   ICELAND REGION

O: 13APR2022 00:27:48  63.8N   22.6W ML=3.4  EMSC   ICELAND REGION

O: 12APR2022 19:52:32  63.9N   22.0W ML=4.2  EMSC   ICELAND REGION

O: 12APR2022 21:31:53  64.0N   23.5W ML=3.1  EMSC   ICELAND REGION

O: 12APR2022 21:55:18  64.0N   23.4W ML=3.2  EMSC   ICELAND REGION

O: 12APR2022 21:21:52  63.8N   22.7W ML=3.2  EMSC   ICELAND REGION               

P: 13APR2022 142857    63.0N   24.0W 3.0-4.4 AAAAA  Iceland area               

 

The strongest seismicity in the U.S. or Canada today was in the eastern Aleutian

Islands with an M 4.9 in the Andreanof Islands and associated events to the west of this in the Rat Islands following that with M 4.2, 4.3 and 4.6. The only earthquake with M>=4.9 in the Andreanof Islands during the year 2022 was an M 5.1 on January 13, 2022. The last of significantly larger magnitude in this area was an M 6.1 on September 24, 2021. Today's event was likely promoted by geomagnetic stresses associated with the current geomagnetic  storm as noted in previous issues of this summary:

 

 

"The geomagnetic field saw active conditions today. The AP level was 19. High latitudes saw stormy conditions with AP 37.  This geomagnetic storm is the strongest since March 13, 2020, a month ago and could bring renewed and enhanced seismicity near the geomagnetic equator and at high latitudes in the next several days. This was evident by the large number of unusual earthquakes today." (April 8-9, 2022)

 

Forecasts 142565 and 142829 had expected today's activity in the Andreanof Islands within about 100 km of today's epicenter around April 5-14.

 

O: 12APR2022 09:15:09  50.2N  179.9W mb=4.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  5APR2022 142565    50.8N  179.5W 3.5-5.0 CAAAA  Andreanoff Isls, Aleutians 

P: 14APR2022 142829    51.6N  180.0W 3.5-4.9 ABAAA  Andreanoff Isls, Aleutians 

 

The activity in the Rat Islands appears to be aftershocks of an M 5.7 in the area which occurred on April 9, 2022. At the time this summary noted:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 5.7 in the region of the Rat Islands, Alaska. It was reported lightly felt in Alaska.  This event is the strongest in the Rat Islands, Alaska since an M 6.4 more than three years ago on April 2, 2019 and prior to that an M 6.6 on October 8, 2017." (April 10, 2022)

 

Forecast 142841 had expected today's activity in the Rat Islands within about 50

km was likely around April 13-15.

 

O: 12APR2022 17:59:41  51.2N  178.9E mb=4.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 12APR2022 12:26:51  51.6N  177.0E mb=4.3  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 12APR2022 17:54:54  51.2N  178.9E mb=4.6  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 13APR2022 142841    52.0N  178.0E 4.0-6.0 AAAAA  Rat Islands                

P: 15APR2022 142841    51.0N  178.0E 4.0-6.0 BAAAA  Rat Islands                

 

An unusual earthquake of M 2.6-2.8 was widely felt today in southern Illinois. NEIC reported it was felt with maximum intensity IV in Springerton and II-III in Burnt Prairie, McLeanboro, Carmi, Fairfield and in Indiana at Evansville and Vincennes.  This is the strongest earthquake in the region of Illinois within about 100 km of this epicenter since an M 2.6 on September 11, 2019 but the last of larger magnitude in this region was an M 3.8 on September 19, 2017.  Forecast 142753 had expected today's earthquake was likely in this area around April 16.  This epicenter is at 103 degrees from the Qinghai earthquake of January 7, 2022 and may have been promoted by energy from that source.

 

O: 13APR2022 01:40:10  38.2N   88.3W mb=2.6  ANSS   ILLINOIS                     

O: 13APR2022 01:40:10  38.2N   88.3W mb=2.8  EMSC   ILLINOIS                     

P: 16APR2022 142753    37.0N   88.0W 2.0-4.0 BBAAA  New Madrid area            

 

An unusual earthquake of M 2.3 also occurred today in eastern Virginia.  An M 2.3 hit this area on June 22, 2021 but the last event in the area of equal or larger magnitude was an M 2.7 on February 2, 2020 and an M 2.5 on September 23, 2019. These are probably aftershocks of the M 5.7 which shook the area and damaged buildings as far as Washington D.C. on August 23, 2011. This summary noted the event in February, 2020 as: 

 

"An M 2.7 aftershock also occurred today in Virginia.  NEIC reported this earthquake of M 2.7 in Virginia  was felt with intensity II-III in the area(s) of Virginia at Louisa, Kents Store, Mineral, Gum Spring, Sandy Hook, Bumpass, Troy, Columbia, Goochland, and Fort Union. This is the strongest earthquake within about 100 km of this epicenter since an M 2.8 on March 15, 2015. These are aftershocks of the M 5.8 which did considerable damage in the area of Virginia and Washington D.C. on August 23, 2011." (February 4, 2020)

 

Forecast 142747 had expected today's activity in Virginia was likely around April 16. This epicenter is at 104 degrees from the Qinghai earthquake of January 7, 2022 and at the third node (120 degrees) from the M 7.0 in the Loyalty Islands of March 31 and may have been promoted by energy from those sources.

 

O: 12APR2022 19:19:35  37.9N   77.6W Md=2.4  EMSC   VIRGINIA                     

P: 16APR2022 142747    37.0N   77.0W 2.0-4.3 BAAAA  Kentucky/Tennessee/NC      

 

UNUSUAL EARTHQUAKE SHAKES BLACK SEA AREA

 

EARTHQUAKE SUMMARY FOR APRIL 11, 2022

 

An unusual earthquake of M 4.5 shook areas of Turkey today. NEIC reported it with intensity II-III in Turkey at Sultanbeyll, Istanbul, Buyukcekmece and Hadimkoy and in Varna, Bulgaria. This is the strongest earthquake within about 200 km of this epicenter in at least five years - since an M 5.3 on October 15, 2015 and prior to that an M 4.5 on March 19, 2013. A smaller event in the Black Sea area occurred earlier in the day and had been noted in the previous issues of this summary as:

 

 

"Light to moderate earthquakes also continued in the area surrounding the

Black Sea today in an activation of that area which has now continued for several weeks. Today's activity occurred as an aftershocks in eastern Turkey of M 4.0; an M 3.9 in the Black Sea off the coast of Georgia and in Bulgaria with M 3.4. Much of this activity is located at or near 144 degrees from the M 7.2 in the Loyalty Islands of March 31 and the M 6.8 in the Fiji Islands of February 16 and may have been promoted by energy from those sources." (April 11, 2022)

 

An M 4.5 also occurred in this area to the west on April 4. This summary noted this event as:

 

"An M 4.5 on the western edge of the Black Sea occurred today in Bulgaria. NEIC reported intensity VI in Provadija, Varna, and IV in Varna, Bulgaria. This is an unusual earthquake and may have been promoted by recent explosions in Ukraine to the east of this during the current hostilities in that area. Bulgaria is not a highly seismic area. The last earthquake of M>=4.5 was an M 4.5 on April 18, 2016 but the last of significantly larger magnitude within about 200 km of today's epicenter was an M 5.0 on August 5, 2009. Today's event occurred within about an hour of local solar noon and may have been promoted by high tidal stresses which maximize near this hour." (April 4, 2022)

 

Forecast 142809 had expected today's event in the Black Sea was likely within  about 150 km of this epicenter around April 13. Today's event is at 142 degrees from the M 7.0 in the Loyalty Islands of March 31, 2022 and may have been promoted by energy from that source.

 

O: 11APR2022 17:38:43  42.3N   31.0E mb=4.5  EMSC   BLACK SEA                    

P: 13APR2022 142809    41.0N   31.0E 3.5-5.0 ABAAA  No. Turkey/Black Sea       

 

Moderate earthquakes also continued at high latitudes in Ocean Ridges today. Events of M 4.6 occurred in the South Sandwich Islands in the South Atlantic and in the Reykjanes Ridge in the northern Atlantic area. These were not reported felt in these remote areas. The earthquake in the South Sandwich Islands was part of a year-long activation of that area and is not unusual for this area at this time. Forecast 142651 had expected this activity around April 9. The event in the Reykjanes Ridge south of Iceland was the strongest within about 200 km of that epicenter since an M 4.6 on December 26, 2021 and prior to that an M 5.1 on October 22, 2020. Forecasts 142574 and 142837 had expected this activity in the north Atlantic was likely within about 25 km of this epicenter between April 5 and 16. This oceanic activity is probably related the current geomagnetic storm as noted in this and previous issues of this summary:

 

 

"The geomagnetic field saw active conditions today. The AP level was 19. High latitudes saw stormy conditions with AP 37.  This geomagnetic storm is the strongest since March 13, 2020, a month ago and could bring renewed and enhanced seismicity near the geomagnetic equator and at high latitudes in the next several days. This was evident by the large number of unusual earthquakes today." (April 8-9, 2022)

 

 

The earthquake in the north Atlantic is at 144-145 degrees from the M 7.0 in the

Loyalty Islands of March 31 and the M 6.8 in Fiji of February 16, 2022 and at the fourth node (90 degrees) from the M 7.3 in Honshu, Japan of March 16, 2022 and may have been promoted by energy from those sources.

 

O: 11APR2022 22:13:01  52.8N   32.1W mb=4.6  EMSC   REYKJANES RIDGE              

P:  5APR2022 142574    53.0N   32.0W 4.0-5.8 CAAAA  North Mid-Atlantic Ridge   

P: 16APR2022 142837    53.0N   32.0W 4.0-5.7 BAAAA  North Mid-Atlantic Ridge   

 

O: 11APR2022 15:40:44  57.9S   26.3W mb=4.6  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  9APR2022 142651    58.0S   25.0W 4.0-5.8 AAAAA  So. Sandwich Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in the Fox Islands, Alaska. It was not reported felt in this remote area. It occurred within about an hour of local solar noon and may have been promoted by tidal stresses which maximize near this hour. The last earthquake within about 150 km of this epicenter of equal or larger magnitude was an M 4.1 on March 14, 2022. Forecast 142570 had expected today's event in this region in early April. 

 

O: 11APR2022 22:03:25  52.8N  165.5W mb=3.7  EMSC   SOUTH OF ALEUTIAN ISLANDS    

P:  4APR2022 142570    51.7N  166.4W 3.5-5.1 CBAAA  Fox Islands, Aleutians     

 

MODERATE QUAKES CONTINUE ON OCEAN RIDGES

 

EARTHQUAKE SUMMARY FOR APRIL 10, 2022

 

The strongest activity in the world today occurred on oceanic ridges. These

were not reported felt in these remote areas. The strongest of these was an M 5.1 and M 4.8 in the western Indian-Antarctic Ridge south of Australia. The last earthquake within about 200 km of this epicenter with M>=5.1 occurred on  December 6, 2019 and September 23, 2018, both with M 5.1. The last of larger  magnitude in this area was an M 5.8 on April 21, 2018. Forecast 142648 had expected today's event was likely within about 100 km around April 5.

 

O: 10APR2022 11:16:04  48.9S  123.9E Mw=5.1  EMSC   WESTERN INDIAN-ANTARCTIC RIDGE

O: 10APR2022 11:34:03  48.9S  123.7E mb=4.8  EMSC   WESTERN INDIAN-ANTARCTIC RIDGE

P:  5APR2022 142648    49.0S  122.0E 4.0-5.4 BAAAA  So. of Australia           

 

An M 4.7 also continued the current activity in the Northern Mid-Atlantic Ridge. This area is near the antipode of the events in the Indian-Antarctic Ridge. Forecast 142498 had expected today's activity within about 50 km of this epicenter was likely around April 4.

 

O: 10APR2022 23:41:22  31.1N   41.6W mb=4.7  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P:  4APR2022 142498    31.0N   41.0W 4.0-5.9 CAAAA  No. Mid-Atlantic Ridge     

 

Moderate earthquakes also continued in the South Sandwich Islands today with two events of M 4.9 each. Forecasts 142652 and 142651 had expected this activity within about 50 km of these epicenters in early April.

 

O: 11APR2022 01:22:13  58.1S   25.3W mb=4.9  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  9APR2022 142651    58.0S   25.0W 4.0-5.8 AAAAA  So. Sandwich Islands       

 

O: 10APR2022 07:05:26  60.7S   25.8W mb=4.9  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  4APR2022 142652    60.0S   29.0W 4.0-5.8 CABAA  So. Sandwich Islands       

 

A series of moderate aftershocks also continued today in the Nicobar Islands, India. These are aftershocks of an M 5.6 on April 6 and an M 5.4 on April 10, 2022. These events were lightly felt in the region of northern Sumatra.  Forecast 142401 had expected today's activity was likely around April 8. This activity is at the seventh node (52 degrees) from the M 7.3 in Honshu, Japan of March 16 and may have been promoted by energy from that source.

 

O: 10APR2022 10:43:25   7.3N   94.4E mb=5.0  EMSC   NICOBAR ISLANDS, INDIA REGION

O: 10APR2022 13:34:27   7.3N   94.3E Mw=5.1  EMSC   NICOBAR ISLANDS, INDIA REGION

O: 10APR2022 14:17:30   7.4N   94.3E Mw=5.1  EMSC   NICOBAR ISLANDS, INDIA REGION

O: 10APR2022 10:20:15   7.1N   94.3E mb=4.5  EMSC   NICOBAR ISLANDS, INDIA REGION

P:  8APR2022 142401     9.0N   93.0E 4.0-5.4 ABBAA  Nicobar Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the Alaska Peninsula. It was not reported felt in this area. The only event during 2022 of equal or larger magnitude in the Alaska Peninsula within about 150 km of today's epicenter occurred with M 5.3 on February 20, 2022. Today's event occurred within minutes of local solar noon and was probably promoted by tidal and geomagnetic stresses which maximize near this hour. Forecast 142564 had excpected today's activity in the Alaska Peninsula was likely around April 8. 

 

O: 10APR2022 22:29:28  56.8N  156.5W mb=4.6  EMSC   ALASKA PENINSULA              

P:  8APR2022 142564    54.7N  156.9W 3.5-5.4 ABAAA  Alaska Peninsula           

 

Light to moderate earthquakes also continued in the area surrounding the Black Sea today in an activation of that area which has now continued for several weeks. Today's activity occurred as an aftershocks in eastern Turkey of M 4.0; an M 3.9 in the Black Sea off the coast of Georgia and in Bulgaria with M 3.4. Much of this activity is located at or near 144 degrees from the M 7.2 in the Loyalty Islands of March 31 and the M 6.8 in the Fiji Islands of February 16 and may have been promoted by energy from those sources.

 

O: 10APR2022 15:49:43  38.2N   38.7E mb=4.0  EMSC   EASTERN TURKEY               

P:  4APR2022 142521    38.0N   39.0E 3.5-5.0 CAAAA  Turkey                      

 

O: 11APR2022 01:34:32  42.4N   41.2E ML=3.9  EMSC   BLACK SEA, OFFSHORE GEORGIA  

P:  2APR2022 142530    40.0N   41.0E 3.5-5.1 CCAAA  Caucasus/Caspian Sea       

 

O: 10APR2022 15:19:44  43.1N   27.6E ML=3.4  EMSC   BULGARIA                     

P:  6APR2022 142556    40.0N   28.0E 3.0-4.9 BCAAA  Romania/NW Turkey          

 

EOMAGNETIC STORM; STRONG QUAKES IN VANUATU AND OCEAN RIDGES COINCIDE

 

EARTHQUAKE SUMMARY FOR APRIL  9, 2022

 

A series of strong and moderately strong earthquakes in oceanic areas today coincided with the strongest geomagnetic storm or the month as noted in this and previous issues of this summary:

 

"The geomagnetic field saw active conditions today. The AP level was 19. High latitudes saw stormy conditions with AP 37.  This geomagnetic storm is the strongest since March 13, 2020, a month ago and could bring renewed and enhanced seismicity near the geomagnetic equator and at high latitudes in the next several days. This was evident by the large number of unusual earthquakes today." (April 8-9, 2022)

 

and:

 

"Quiet conditions persisted in the global seismicity pattern today. This could be related to the lack of geomagnetic activity.  The active conditions in the geomagnetic field ceased today and were replaced by quiet. SWPC expected this to be temporary and may see active to minor storms in the next two days as noted in this summary" (April 8-9, 2022)

 

The strongest earthquake in the world today was an M 6.3 in the region of Vanuatu occurred on the geomagnetic equator. NEIC reported it was strongly felt with intensity VIII in Valuatu at Norsup, Malampa; VII in Lakatoro and II-III in Port Olry, Sanma and Vila Shefa. This is the strongest earthquake in Vanuatu within about 200 km of this epicenter since an M 6.9 about 200 km to the north on August 18, 2021 and prior to that an M 6.4 on August 5, 2020.  When a foreshock hit the region yesterday, this summary noted:

 

"Another earthquake likely promoted by a tropical storm occurred today in the Vanuatu Islands. Tropical Cyclone Fili passed near this epicenter several days ago and was described in this summary as likely to have seismic effects in Vanuatu as:

 

"TC Fili (23P) continued today west of the central Vanuatu Islands with winds up to 55 kts. It is expected to track to the south and east over the next several days reaching the area of the Loyalty Islands around April 6, 2022 and may enhance the aftershock series in that area including the possibility of a strong aftershock as this storm moves through the area." (April 5-6, 2022)

 

Regional seismicity is likely to remain enhanced in this area in the next several days due to lingering effects of TC Fili and the coming geomagnetic storm. This area is located on the geomagnetic equator." (April 8-9, 2022)

 

Forecast 142618 had expected today's event in Vanuatu was likely around April 10.

 

O:  9APR2022 20:52:37  16.3S  166.8E Mw=6.3  EMSC   VANUATU                      

P: 10APR2022 142618    18.0S  168.0E 4.0-5.4 ABAAA  Vanuatu Islands            

 

Several moderately large earthquakes also shook ocean ridge areas today. These were not reported felt in these remote areas. Included in this activity was an M 5.7-5.8 in the South Indian Ocean and an M 5.8 in the northern Mid-Atlantic. The M 5.7 in the Northern Mid-Atlantic Ridge is near the recent swarm of events in the Azores which many thought might precede a larger regional event or volcanism in the area. The only earthquakes within about 300 km of today's epicenter in the past 10 years occurred as an M 5.7 on December 19, 2018 and M 5.9 on June 30, 2017. Forecast 142498 had expected today's event within about 50 km of this epicenter was likely around April 4. This earthquake is located at 102 degrees from  the M 6.9 in Qinghai, China of January 7, 2022 and may have been promoted  by energy from that source.

 

O: 09APR2022 22:33:15  31.7N   40.9W mb=5.0  EMSC   NORTHERN MID-ATLANTIC RIDGE

O:  9APR2022 23:09:44  31.6N   41.0W Mw=5.7  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P:  4APR2022 142498    31.0N   41.0W 4.0-5.9 BAAAA  No. Mid-Atlantic Ridge     

 

An M 4.4 in the Madeira Islands of Portugal to the east of this epicenter in the mid-Atlantic also occurred today. The only events of larger magnitude in the Madeira Islands in the past year occurred on February 16, 2022 with M 4.8 and as an M 4.5 on September 5, 2021.

 

NEIC reported this earthquake of M 4.4 in the Madeira Islands, Portugal  was felt with intensity IV in the area(s) of  Canico.

 

O:  9APR2022 09:45:22  32.2N   17.2W mb=4.4  EMSC   MADEIRA ISLANDS, PORTUGAL REGI

 

The M 5.8 in the Mid-Indian Ocean ridge toay is the strongest within about  300 km of this epicenter since events of M 5.8 and M 6.1 on September 19 and April 12, 2020, the strongest in the area since an M 6.4  on October 4, 2013 and an M 6.1 on May 7, 2006. Forecast 142378 had expected today's event within about 50 km was likely in late March or early April, 2022.

 

O:  9APR2022 15:49:08  36.7S   78.8E Mw=5.8  EMSC   MID-INDIAN RIDGE             

P: 31MAR2022 142378    37.0S   79.0E 4.0-5.5 CAAAA  So. Indian Ocean           

 

A moderate earthquake of M 5.3 in eastern Turkey today was strongly felt in the region. NEIC reported intensity VIII in Sincik, Adiyaman, Turkey with IV in Elazig, V in Malatya and IV in Yesilyurt, Turkey. No major damage or casualties were reported with this earthquake. This continues a strong activation of regions around the Black Sea in the past week coinciding with hostilities in Ukraine. More enhanced activity in the area is likely. It is the strongest earthquake within about 200 km of this epicenter since aftershocks of M 5,3-5.5 in April and December, 2020 following and M 6.7 mainshock on January 24, 2020. Forecast 142521 had expected today's event within about 50 km was likely in early April.

 

O:  9APR2022 14:02:14  38.2N   38.6E Mw=5.3  EMSC   EASTERN TURKEY               

P:  4APR2022 142521    38.0N   39.0E 3.5-5.0 BAAAA  Turkey                     

 

A moderate earthquake of M 5.4 in Papua, Indonesia followed similar but smaller

earthquakes there yesterday.

 

"A third earthquake which may have been promoted by a tropical cyclone occurred today in the region of Papua, New Guinea, Indonesia with M 5.1. Tropical Storm Malakas passed north of this epicenter at the time of this earthquake. This type of regional interaction with Malakas had been described in this an previous issues of this summary as:

 

"TS Malakas (TD 02W) continued today in the area north of New Guinea with winds up to 70 kts. It is expected to track to the west becoming a major storm in several days. Seismicity in New Guinea and Indonesia could be enhanced by effects from this storm." (April 7-9, 2022)

 

Forecast 142423 had expected today's event was likely within about 100 km  of this epicenter in early April.

 

O:  9APR2022 21:22:11   3.2S  139.8E mb=5.4  EMSC   PAPUA, INDONESIA             

P:  4APR2022 142423     3.0S  139.0E 4.0-5.4 BAAAA  West Irian, PNG            

 

The strongest earthquake in the U.S. or Canada today was an M 5.7 in the region of the Rat Islands, Alaska. It was reported lightly felt in Alaska.  This event is the strongest in the Rat Islands, Alaska since an M 6.4 more than three years ago on April 2, 2019 and prior to that an M 6.6 on October 8, 2017.  Forecast 142578 had expected this within about 100 km was likely around April 8.

 

O: 09APR2022 22:04:29  51.3N  178.6E mb=4.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O:  9APR2022 16:29:16  51.2N  178.8E Mw=5.7  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  8APR2022 142578    52.0N  179.0E 4.0-5.8 AAAAA  Rat Islands                

 

MODERATELY STRONG QUAKE SHAKES SOUTHERN TAIWAN

 

EARTHQUAKE SUMMARY FOR APRIL  7, 2022

 

The strongest earthquake in the world today was an M 5.7 in Southern Taiwan. NEIC reported it was felt with intensity IV in Pingtung and II in Kaohsiung Counties, Taiwan. CWB reported it was felt with maximum intensity IV in Pingtung, III in Taitung; II in Kaohsiung, Tainan and I in Tainan, Hualien, Chiayi, Nantou, and Yunlin Counties, Taiwan. An M 6.7 and aftershocks of M 5.8 and M 6.0 struck Taiwan on March 22, 2022. This event was about 200 km north of today's epicenter and today's event is probably not an aftershock of that. Forecast 142462 had expected today's event was likely within about 100 km around April 7.

 

 

O:  7APR2022 23:36:11  21.7N  121.0E ML=5.6  TAI    Hualien, Taiwan              

O:  7APR2022 23:36:13  21.7N  121.1E Mw=5.7  EMSC   TAIWAN REGION                

P:  7APR2022 142462    22.0N  122.0E 4.0-5.6 AAAAA  Taiwan                     

 

An unusually large M 4.7 shook areas of Poland today. NEIC reported it was felt with intensity VI in Poland at Rybnik and Polkowice. This follows a pair of foreshocks in this area yesterday of M 3.2 and 3.7. These had been noted in the previous issue of this summary as:

 

 

"A pair of light earthquakes of M 3.2 and 3.6 occurred today in the region of Poland. While activity in this area is not unusual, these followed an M 4.6 in Bulgaria which occurred yesterday and may indicated some seismic enhancement in the area is being promoted by the incessant bombardment of ground targets in the ongoing hostilities in neighboring Ukraine. ...

 

 

The last earthquake of M>=3.7 in this region of Poland occurred as events of

M 4.3 on January 13, 2022 and February 5, 2022. These were probably mining-related events. Local enhanced stresses can help promote mining-related earthquakes and rockfalls by weakening pre-existing structures and this may be happening in this case. Forecast 142576 had expected today's activity was likely around April 3. This activity is at 144 degrees from the M 7.0 in the Loyalty Islands of March 31 and may have also been promoted by energy from that source." (April 7, 2022)

 

The last earthquake of M>=4.7 in this area was an M 4.9 on July 8, 2020. The largest earthquakes in this area in the past 20 years were of M 5.0 on February 20, 2002, July 21, 2009, December 30, 2010 and July 20, 2018. Forecast 142576 had expected today's event within about 50 km was likely around April 3.

 

O:  7APR2022 16:58:46  51.6N   16.1E mb=4.7  EMSC   POLAND                       

P:  3APR2022 142576    51.0N   16.0E 3.0-4.4 BAAAA  Poland                     

 

Am M 5.1 also occurred at 144 degrees from the Loyalty Islands today in the  Central Mid-Atlantic. This had been expected in forecast 142392 to occur around April 8.

 

O:  7APR2022 10:13:50   9.0N   40.5W mb=5.1  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P:  8APR2022 142392     8.0N   37.0W 4.0-5.6 AACAA  Central Mid-Atlantic Ridg  

 

An unusual earthquake of M 4.9 was also felt in Malawi today near the border with Mozambique. NEIC reported it was felt in Malawi with intensity II-III in Blantyre, and Zomba. A similar M 4.9 hit the area on March 17, 2018 within about 50 km of today's epicenter. This was an aftershock of an M 5.6 on March 8, 2018 and today's event may also be an aftershock of that mainshock, the strongest in the past four years. Forecast 142604 had expected today's activity was likely around April 6. This event may have been promoted by high tidal stresses as it occurred within about an hour of local solar noon, a time when such stresses maximize.

 

O:  7APR2022 10:43:09  17.0S   35.5E mb=4.9  EMSC   MOZAMBIQUE                   

P:  6APR2022 142604    18.0S   42.0E 3.0-4.6 AACAA  Madagascar area            

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in British Columbia in the Vancouver Island region. It was not reported felt. The last earthquake within about 100 km of this epicenter with M>=4.0 was an M 4.1 on October 12, 2021 and an M 4.3 on September 21, 2021.  Forecast 142560 had expected regional seismic enhancement around April 5.

 

O:  7APR2022 12:12:20  48.9N  128.3W MB=4.0  ECAN of Port Alice, BC              

P:  5APR2022 142560    49.9N  130.2W 2.8-5.1 AABAA  Vancouver Island area      

 

A light earthquake of M 2.0 continued a series in South Carolina today. NEIC reported this earthquake of M 2.0 in South Carolina was felt with intensity II-III in the area(s) of South Carolina in Lugoff, Elgin, Columbia, Lexington.

The last earthquake of M>=2 in South Carolina occurred on March 27, 2022 with

M 2.3 at today's epicenter. The recent activity near this epicenter follows an M 3.6 on December 27, 2021. This is probably reservoir-related seismicity due to lubrication of faults in the area or loading due to  rain and flooding in recent weeks. Forecast 142516 had expected today's activity was likely around April 4.

 

O:  7APR2022 09:03:36  34.2N   80.7W Md=2.0  EMSC   SOUTH CAROLINA               

P:  4APR2022 142516    34.0N   81.0W 2.0-4.1 AAAAA  Southeast U.S.             

 

LIGHT EARTHQUAKES IN POLAND AND BULGARIA INDICATE REGIONAL ENHANCEMENT

 

EARTHQUAKE SUMMARY FOR APRIL  6, 2022

 

A pair of light earthquakes of M 3.2 and 3.7 occurred today in the region of Poland. While activity in this area is not unusual, these followed an M 4.6 in Bulgaria which occurred yesterday and may indicated some seismic enhancement in the area is being promoted by the incessant bombardment of ground targets in the ongoing hostilities in neighboring Ukraine. This summary noted this when the earthquake in Bulgaria occurred yesterday as:

 

"An M 4.5 on the western edge of the Black Sea occurred today in Bulgaria. NEIC reported intensity VI in Provadija, Varna, and IV in Varna, Bulgaria. This is an unusual earthquake and may have been promoted by recent explosions in Ukraine to the east of this during the current hostilities in that area. Bulgaria is not a highly seismic area. The last earthquake of M>=4.5 was an M 4.5 on April 18, 2016 but the last of significantly larger magnitude within about 200 km of today's epicenter was an M 5.0 on August 5, 2009. Today's event occurred within about an hour of local solar noon and may have been promoted by high tidal stresses which maximize near this hour." (April 5, 2022)

 

The last earthquake of M>=3.7 in this region of Poland occurred as events of

M 4.3 on January 13, 2022 and February 5, 2022. These were probably mining-related events. Local enhanced stresses can help promote mining-related earthquakes and rockfalls by weakening pre-existing structures and this may be happening in this case. Forecast 142576 had expected today's activity was likely around April 3. This activity is at 144 degrees from the M 7.0 in the Loyalty Islands of March 31 and may have also been promoted by energy from that source.

 

O: 06APR2022 18:43:09  51.6N   16.2E ML=3.7  EMSC   POLAND

O:  6APR2022 08:48:11  51.6N   16.2E ML=3.3  EMSC   POLAND                       

P:  3APR2022 142576    51.0N   16.0E 3.0-4.4 BAAAA  Poland                     

 

Light earthquakes also continued in the swarm in the Azores Islands. The strongest today was an M 2.7. Local geologists have noted that the first volcanic tremor to date in this swarm occurred today. This could indicate that a volcanic eruption is not far away. Forecast 142498 had expected regional enhancement of seismicity in early April.

 

O:  6APR2022 22:59:40  38.7N   28.2W ML=2.7  EMSC   AZORES ISLANDS, PORTUGAL     

P:  4APR2022 142498    38.0N   32.0W 4.0-5.6 AABAA  No. Mid-Atlantic Ridge     

 

The strongest earthquake in the world today was an M 5.5 in the Kermadec Islands, New Zealand. It was not reported felt in this remote area. The last earthquake within about 100 km of today's epicenter with M>=5.5 was an M 5.8 on March 1, 2022 and an M 5.6 on February 2, 2022. The only other event of larger magnitude in this area in the past year was an M 5.8 on June 6, 2021. Forecast 142630 had expected today's event within about 50 km was likely around April 8. This earthquake is located at 101 degrees from the M 6.9 in Qinghai, China of January 7, 2022 and may have been promoted by energy from that source.

 

O:  6APR2022 15:27:55  27.1S  176.3W Mw=5.5  EMSC   KERMADEC ISLANDS REGION      

P:  8APR2022 142630    27.0S  177.0W 4.0-5.7 AAAAA  Tonga Islands              

 

 

 

MODERATE EARTHQUAKE DAMAGING IN SICHUAN, CHINA

 

EARTHQUAKE SUMMARY FOR APRIL  5, 2022

 

An earthquake of M 5.2 on the border of Sichuan and Guizhou, China today caused

damage to more than 300 buildings according to CERI and News sources. While minor injuries were reported there were no deaths or major injuries related to this earthquake reported by these sources.  NEIC reported this earthquake of M 5.2 in Sichuan, China was felt with intensity IV-V in the area(s) of Sichuan, China in Luzhou, Yibin and Chengdu. The last earthquake of M>=5.2 in this region within about 250 km was an M 5.4 on September 15, 2021 and prior to that an M 5.2 on December 18, 2019.  Forecast 142181 had expected regional activation was likely at the end of March or in early April.

 

O:  5APR2022 23:50:06  28.3N  105.1E mb=5.2  EMSC   SICHUAN-GUIZHOU BORDER RG, CHI

O:  5APR2022 23:50:05  28.2N  105.0E mb=5.1  CERI   SICHUAN-GUIZHOU BORDER RG, CHI

O:  6APR2022 21:54:49  28.1N  105.1E mb=4.1  CERI   SICHUAN-GUIZHOU BORDER RG, CHI

O:  6APR2022 13:07:55  27.8N  100.6E mb=3.4  CERI   SICHUAN-GUIZHOU BORDER RG, CHI

P: 30MAR2022 142181    26.0N  101.0E 4.0-5.6 BCCAA  Myanmar                    

 

A second moderately strong earthquake in the past two days occurred as an M 5.4 near the east coast of Honshu, Japan today.  NEIC reported this earthquake of M 4.9 in Eastern Honshu, Japan was felt with intensity II-III in the area(s) of Eastern Honshu, Japan with IV in Miyagi and Fukushima, Iwate, Tokyo Prefectures, Japan.  This follows an M 5.5 in this area yesterday which was addresses in the previous issue of this summary as:

 

" ... probably promoted by the current geomagnetic storm. Today's M 5.5 off the coast of Eastern Honshu is the strongest aftershock to date of the M 7.3 in that region of March 16, 2022. Forecast 142502 had expected this event within about 50 km was likely around April 5." (April 4-5, 2022)

 

Today's event occurred within minutes of local solar midnight and may have been promoted by high tidal stresses which maximize near this hour.

 

O: 06APR2022 06:18:30  37.8N  141.8E ML=4.3  EMSC   NEAR EAST COAST OF HONSHU, JAPAN

O:  5APR2022 15:03:53  37.9N  141.7E mb=5.4  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  4APR2022 142502    37.0N  141.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

An earthquake of M 5.5 also occurred today in the Nicobar Islands, India north of Sumatra. BMG reported it was felt with intensity II in Kab at Aceh Besar, Pidie, Banda Aceh, Sabang, Bogot and Bekasi. The Indian National Center for Seismicity (NCS) reported maximum intensity III-IV for this event. This is the strongest earthquake within about 300 km of this epicenter since an M 6.1 and 5.5 on August 3 and 4, 2021 and prior to that an M 6.0 on March 14, 2017. A major earthquake of M 7.7 occurred exactly 12 years ago on April 6, 2010 south of today’s epicenter. Forecast 142401 had expected enhanced activity in the Nicobar Islands north of today's epicenter was likely around April 8.

 

O:  6APR2022 05:29:43   7.4N   94.3E Mw=5.5  EMSC   NICOBAR ISLANDS, INDIA REGION

O:  6APR2022 05:29:45   7.4N   94.5E Mw=5.6  BMG    NICOBAR ISLANDS, INDIA REGION

O:  6APR2022 05:29:46   7.5N   94.3E Mw=5.2  NCS    NICOBAR ISLANDS, INDIA REGION

P:  8APR2022 142401     9.0N   93.0E 4.0-5.4 ABBAA  Nicobar Islands            

 

The strongest earthquake in the world today was an M 5.7 in the South Sandwich Islands. This continues enhanced seismicity in this region which has been ongoing for months. These are aftershocks of the M 7.5-8.0 on August 12, 2021. The last earthquake in the area of larger magnitude than today's was an M 6.0 on March 6, 2022. Forecast 142651 had expected today's event within about 25 km of this epicenter was likely around April 9.

 

O:  5APR2022 21:26:53  58.0S   25.4W Mw=5.7  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  9APR2022 142651    58.0S   25.0W 4.0-5.8 BAAAA  So. Sandwich Islands       

 

Another unusual earthquake on ocean ridges today occurred as an M 4.9 in the Southeast Indian Ridge. The last earthquake within about 300 km of this epicenter with M>=4.9 occurred with M 5.5 on May 19, 2021 and before that an M 5.1 on February 2, 2018. Forecast 142645 had expected today's activity within about 50 km was likely around April 8.

 

O:  5APR2022 07:23:21  41.7S   85.2E mb=4.9  EMSC   SOUTHEAST INDIAN RIDGE        

P:  8APR2022 142645    42.0S   85.0E 4.0-5.5 BAAAA  So. Indian Ocean           

 

 

MO

GLOBAL SEISMIC ACTIVATION IN MANY AREAS

 

EARTHQUAKE SUMMARY FOR APRIL  4, 2022

 

Global seismicity was higher today in many areas of the world. These included

an M 6.0 in the Vanuatu Islands; an M 5.9 in the Molucca Sea of Indonesia, an M 5.5 in Honshu, Japan  and an unusual M 4.5 in Bulgaria among others. The largest  of these were located about 10 degrees from the geomagnetic equator and may have been promoted by the current geomagnetic disturbance as noted in this and previous issues of this summary as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 11. High latitudes saw quiet conditions with AP 13.  This continues the strongest geomagnetic storm since AP reached 40 on March 13, 2022. A strong geomagnetic storm began late on March 30 and continued through the first 9 hours of March 31 at least. Moderate increases in seismicity at high latitudes and near the geomagnetic equator may occur in the next three days including the possibility of a major earthquake at this time." (April 2-4, 2022)

 

The strongest earthquake in the world today was an M 6.0 in Vanuatu. NEIC reported it was felt with intensity V in Vanuatu at Vila Shefa and in Luganville, Sanma, Vanuatu. This earthquake may have been promoted by stresses associated with Tropical Cyclone Fili which was passing to the west of this epicenter when the earthquake occurred. This summary noted this possibility in the previous issue as:

 

"TC Fili (23P) continued today west of the central Vanuatu Islands with winds up to 55 kts. It is expected to track to the south and east over the next several days reaching the area of the Loyalty Islands around April 6, 2022 and may enhance the aftershock series in that area including the possibility of a strong aftershock as this storm moves through the area." (April 3-4, 2022)

 

This is the strongest earthquake in central Vanuatu within about 150 km of this epicenter since an M 6.1 of February 18, 2021 more than a year ago. The last earthquake in the area of significantly larger magnitude in the area was an M 6.4 on August 5, 2020. Forecast 142618 had expected enhanced seismicity in this area was likely around April 2.  This earthquake, like the M 5.9 in the Molucca Sea, Indonesia is located near the fifth node (72 degrees) from the M 7.0 of January 11, 2022 in the Fox Islands and may have been promoted by energy from that source. It is also at the sixth node (60 degrees) from the M 7.3 off Honshu, Japan  of March 16, 2022.

 

O:  4APR2022 16:06:56  17.4S  168.0E Mw=6.0  EMSC   VANUATU                       

P:  2APR2022 142618    17.0S  167.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

A moderately strong M 5.9 earthquake also occurred in the Molucca Sea, Indonesia today. NEIC reported maximum intensity IV in Ternate, Maluku. This is the strongest earthquake in the Molucca Sea within about 200 km of this epicenter since an M 6.0 about 200 km to the north on January 22, 2022 and prior to that an M 6.1 on July 10, 2021. The last such earthquake nearer to today's event was an M 6.1 on June 3, 2021.  Forecasts 142398 and 142400 had expected this enhanced activity within the area was likely around April 6-8.  This earthquake - like the M 6.0 in Vanuatu today, is located near the fifth node (72 degrees) from the M 7.0 of January 11, 2022 in the Fox Islands and may have been promoted by energy from that source.

 

O:  5APR2022 01:44:09   2.0N  127.0E mb=5.9  EMSC   MOLUCCA SEA                  

P:  6APR2022 142398     4.0N  127.0E 4.0-5.4 ABAAA  Halmahera                  

P:  8APR2022 142400     3.0N  126.0E 4.0-5.6 BAAAA  Mindanao, Philippines      

 

An M 4.5 on the western edge of the Black Sea occurred today in Bulgaria. NEIC reported intensity VI in Provadija, Varna, and IV in Varna, Bulgaria. This is an unusual earthquake and may have been promoted by recent explosions in Ukraine to the east of this during the current hostilities in that area. Bulgaria is not a highly seismic area. The last earthquake of M>=4.5 was an M 4.5 on April 18, 2016 but the last of significantly larger magnitude within about 200 km of today's epicenter was an M 5.0 on August 5, 2009. Today's event occurred within about an hour of local solar noon and may have been promoted by high tidal stresses which maximize near this hour. Forecast 142556 had expected enhanced seismicity south of today's event was likely around April 6. This epicenter is at 143 degrees from the Loyalty Islands and was probably promoted by energy from the M 7.0 in that area of March 31, 2022.

 

O:  4APR2022 10:59:39  43.1N   27.5E mb=4.5  EMSC   BULGARIA                      

P:  6APR2022 142556    40.0N   28.0E 3.0-4.9 ACAAA  Romania/NW Turkey          

 

An M 4.4 occurred today in Guadeloupe. NEIC reported it was felt with intensity II-III in Guadeloupe at Les Abymes, Sante-Rose, Lamentin, Petit-Bourg and in Antigua and Barbuda at Freetown, Saint John's and Bolands, Saint Mary. This is the strongest earthquake within about 150 km of Guadeloupe since an M 5.0 on February 15, 2022. Moderate aftershocks of M 4.4 occurred on February 21 and March 25, 2022. Forecasts 142436 had expected this enhanced activity was likely between April 2 and 6.

 

O:  4APR2022 22:02:08  16.8N   61.2W mb=4.4  EMSC   GUADELOUPE REGION, LEEWARD ISL

P:  2APR2022 142436    18.0N   61.0W 3.0-5.3 ABAAA  Leeward Islands            

P:  6APR2022 142436    15.0N   61.0W 3.0-5.4 ABAAA  Leeward Islands            

 

A moderate earthquake of M 4.8-5.1 also shook the region of Tokyo, Japan today. NEIC reported maximum intensity IV in Chiba Prefecture with lesser shaking in Saitama and Tokyo, Japan. This followed an M 5.4-5.5 off the east coast of Honshu, Japan several hours earlier. This event was felt with maximum intensity V in Fukushima and II-III in Miyagi, Ibaraki, Tochigi, and Tokyo, Japan. It was followed by an M 5.4 in the Kuril Islands about half an hour later. The area is sensitive to geomagnetic storms and much of today's activity is probably promoted by the current geomagnetic storm. Today's M 5.5 off the coast of Eastern Honshu is the strongest aftershock to date of the M 7.3 in that region of March 16, 2022. Forecast 142502 had expected this event within about 50 km was likely around April 5. The M 5.1 near Tokyo is the strongest earthquake within about 100 km of Tokyo since an M 5.9 on October 7, 2021.  It had been forecast within about 25 km to occur around April 7 (forecast 142501).

 

O:  4APR2022 13:29:54  35.7N  140.1E mb=5.1  EMSC   NEAR EAST COAST OF HONSHU, JAP

O:  4APR2022 13:31:30  35.8N  140.0E ML=3.9  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  7APR2022 142501    36.0N  140.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

O:  4APR2022 10:29:05  37.4N  141.6E Mw=5.5  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  4APR2022 142502    37.0N  141.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

The earthquake of M 5.4 in the Kuril Islands occurred within minutes of local

solar midnight and was probably promoted by geomagnetic and/or tidal effects which maximize near this hour. It is the strongest earthquake within about 200 km of this epicenter since an M 5.8 on October 11, 2021.  Forecast 142544 had expected this event within about 100 km was likely around April 6.  This earthquake is located near the fifth node (72 degrees) from the M 7.0 of March 31, 2022 in the Loyalty Islands and may have been promoted by energy from that source.

 

O:  4APR2022 14:13:35  47.6N  154.1E Mw=5.4  EMSC   KURIL ISLANDS                

P:  6APR2022 142544    48.0N  155.0E 3.5-5.4 AAAAA  NE Pacific                 

 

The strongest earthquakes in the U.S. or Canada today were an M 4.1 followed several minutes later by an M 3.8 in Northern California. NEIC reported they were felt with intensity IV in Ferndale, Scotia and Petrolia and II-III in Ferndale, Rio Dell, Fortuna, Hydesville, Scotia, Loleta, Petrolia, Carlotta, Eureka and Redcrest. An aftershock of M 2.9 in Northern California was felt with intensity II-III in the area(s) of Northern California with IV in Ferndale and lesser shaking in Rio Dell, Carlotta, Eureka and Arcata. The M 4.1 is the strongest earthquake in the area since an M 4.6 on January 6, 2022. These may be regional aftershocks of the M 6.2 which hit the area about 50 km west of today's epicenter on December 20, 2021 but the last such event closer to today's epicenter was an M 4.5 on September 9, 2021. Forecast 142551 had expected today's enhanced seismicity was likely in this area around April 5. This earthquake is located near the fourth node (90 degrees) from the M 7.0 of March 31, 2022 in the Loyalty Islands and may have been promoted by energy from that source.

 

O: 04APR2022 15:18:30  40.5N  124.2W Mw=3.8  EMSC   NORTHERN CALIFORNIA

O: 04APR2022 21:16:24  40.5N  124.2W ML=2.5  EMSC   NORTHERN CALIFORNIA

O:  4APR2022 15:16:44  40.5N  124.3W Mw=4.1  EMSC   NORTHERN CALIFORNIA          

P:  5APR2022 142551    40.6N  124.9W 2.5-4.6 AAAAA  Off Coast of No. Calif     

 

DERATE QUAKES SHAKE NORTHERN MINDANAO, PHILIPPINES

 

EARTHQUAKE SUMMARY FOR APRIL  3, 2022

 

Moderate earthquakes of M 5.5, 5.5 and 5.6 hit the region of northern Mindanao, Philippines today. PHIVOLCS reported these were felt with intensity IV in Cantilan, Bayabas and Lanuza, Surigao del Sur; III in Bayabas, Cagwait, Carrascal and Madrid, Surigao del Sur and Rosario, Agusan Del Sur and II in Carmen, Surigao del Sur, Mindanao, Philippines. This seismicity began yesterday in the region and was addressed in the previous issue of this summary as:

 

 

"An earthquake of M 4.9 also occurred in northern Mindanao, Philippines today.

NEIC reported this earthquake of M 4.9 in Mindanao, Philippines was felt with intensity II-III in the area(s) of Mindanao, Philippines in Brasilisa, Caraga.  This event follows a similar M 5.0 in this region earlier in the day. The last earthquake of M>=4.9 before this within about 150 km of this epicenter was an M 4.9 on November 23, 2021. This is on the geomagnetic equator and occurred near the maximum of today's geomagnetic storm. It is likely it was triggered by effects from the current geomagnetic storm as noted in this and past summaries:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 17. High latitudes saw minor storms with AP 35.  This continues the strongest geomagnetic storm since AP reached 40 on March 13, 2022. High latitude geomagnetic field also saw quiet conditions with AP 35. A strong geomagnetic storm began late on March 30 and continued through the first 9 hours of March 31 at least. Moderate increases in seismicity at high latitudes and near the geomagnetic equator may occur in the next three days including the possibility of a major earthquake at this time." (March 31-April 1, 2022)

 

More enhanced seismicity is expected in this area as this geomagnetic storm continues. Forecast 142438 and 142112 had expected this activity in late March or early April." (April 1-2, 2022)

 

The largest of this swarm occurred at the end of solar flare 5530 and may have been promoted by SFE associated with that flare. The parameters of this flare follow:

 

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

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

 

5530       1005   1014      1018   C1.6      (April 3, 2022)   1.2E-03  

 

One of these events - the M 5.6 occurred within minutes of local solar midnight and was probably promoted by high tidal stresses. This is the strongest  earthquake in Northern Mindanao within about 200 km of this epicenter since an M 6.0 on November 15, 2020 and an M 5.8 on September 20, 2020. Forecasts 142438 and 142112 had expected activity within about 50 km of these epicenters was likely to be enhanced at the end of March and in early April, 2022.

 

O: 03APR2022 10:24:55   9.3N  126.6E Mw=5.7  EMSC   MINDANAO, PHILIPPINES

O: 03APR2022 11:22:07   9.3N  126.6E mb=5.4  EMSC   MINDANAO, PHILIPPINES

O: 03APR2022 11:35:16   9.3N  126.9E mb=4.8  EMSC   MINDANAO, PHILIPPINES

O: 03APR2022 18:36:09   9.4N  126.7E mb=4.9  EMSC   MINDANAO, PHILIPPINES

O:  3APR2022 15:29:40   9.2N  126.6E Mw=5.6  EMSC   MINDANAO, PHILIPPINES        

P:  3APR2022 142438    11.0N  126.0E 3.5-4.9 ABAAA  Luzon, Philippines         

P: 26MAR2022 142112     9.0N  127.0E 4.0-5.4 CAAAA  Halmahera                  

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in Central Alaska. The last earthquake within about 100 km of this epicenter with greater magnitude was an M 4.4 on June 19, 2021. Forecast 142590 had expected this event was likely in this area around April 3.

 

O:  3APR2022 12:22:00  64.3N  149.9W ML=3.8  EMSC   CENTRAL ALASKA               

P:  3APR2022 142590    62.7N  149.3W 3.2-4.9 ABAAA  Central Alaska             

 

An earthquake of M 5.0 occurred today in the area southeast of Easter Island. It was not reported felt in this remote area. The only earthquake of equal or greater magnitude within about 200 km of this epicenter in the past year was an M 5.2 on May 25, 2021. An M 4.9 about 500 km to the northwest of this occurred on March 31. At the time this summary  noted this earthquake as:

 

"Another earthquake that was probably promoted by high tidal stresses with the new moon today was an M 4.9 southeast of Eastern Island. This event occurred within minutes of local solar noon, a time and longitude when tidal stresses were maximized with the current new moon.  The last earthquake in this area of equal of greater magnitude was an M 5.4 on December 13, 2021. Forecast 142381 had expected enhanced seismicity in this area was likely at the end of March. This earthquake occurred near the start of the M9.6 flare today." (April 1, 2022)

 

Today's event also appears to have been promoted by high tidal stresses as it occurred near the longitude of maximum tidal stresses with the current new moon and within about an hour of local solar noon which such stresses are maximized as noted in this and previous issues of this summary:

 

"The new moon arrived on April 1, 2022 at 06:24 UT. Longitudes which were at local solar midnight at this time are near 100 West while those at local solar noon are near 80 East. These include, in the west areas of Central U.S. and central Mexico and portions of the East Pacific Rise and in the east in China, Pakistan and India in central Asia and in the South Indian Ocean. These are the regions most likely to see tidal triggering at this time and during the next week. Other areas can also be promoted by tidal stresses. These are most likely to occur near local solar noon and midnight." (March 28-April 1, 2022)

 

Forecast 142643 had expected today's event within about 50 km was likely

around April 2.

 

O:  3APR2022 19:50:11  41.2S   90.4W Mw=5.0  EMSC   SOUTHEAST OF EASTER ISLAND   

P:  2APR2022 142643    41.0S   91.0W 4.0-5.4 AAAAA  Chile Rise                  

 

 

PROTON STORM MAY REDUCE SEISMICITY

 

EARTHQUAKE SUMMARY FOR APRIL  2, 2022

 

 

SWPC expects a proton storm today and tomorrow. Proton storms reduce the charge on negatively charged ring currents and can temporarily reduce induced global seismicity. Little strong or major seismicity is therefore expected in the next two days.

 

The strongest earthquakes in the world today continued in the South Pacific with an M 5.5 in the Loyalty Islands and an M 5.2 in Tonga to the northeast of this epicenter. The event in the Loyalty Islands follows a strong aftershock sequence which has included earthquake with magnitudes up to 6.5 in the days since an M 7.0 on March 31, 2022. Forecast 142623 had expected this activity to continue in early April.

 

O: 02APR2022 23:06:24  22.6S  170.8E mb=4.8  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O:  2APR2022 10:45:59  22.6S  170.6E Mw=5.5  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P:  2APR2022 142623    21.0S  170.0E 4.0-5.4 ABAAA  Loyalty Islands            

P:  5APR2022 142623    22.0S  170.0E 4.0-5.6 BAAAA  Loyalty Islands            

 

The earthquake of M 5.2 in Tonga is the strongest within about 150 km of that epicenter since an M 5.5 about 150 km to the north occurred on February 22, 2022. Forecast 142352 had expected today's enhanced seismicity in this area was likely in late March to early April.

 

NEIC reported this earthquake of M 5.2 in Samoa was felt with intensity II-III in the area(s) of Samoa at Apia Apia.

 

O:  2APR2022 22:05:14  17.2S  174.7W mb=5.2  EMSC   TONGA                         

P:  4APR2022 142614    16.0S  173.0W 4.0-5.7 ABBAA  Tonga Islands              

P: 27MAR2022 142352    17.0S  173.0W 4.0-5.8 BABAA  Tonga Islands              

P: 29MAR2022 142352    16.0S  175.0W 4.0-5.8 BBAAA  Tonga Islands              

 

An earthquake of M 5.0 occurred today in Argentina. This followed an M 5.3 on April 1, 2022 as described in the previous issue of this summary:

 

"The strongest earthquake felt in the world today was an M 5.2 in Argentina. NEIC reported intensity V in La Ligua, Valparaiso, Chile and IV in Vina del mar, Chile and San Juan, Argentina. It was also felt with intensity II-III in Mendoza and Cordoba, Argentina and in Santiago, Chile. This is the strongest earthquake within about 150 km of this epicenter in Argentina since an M 6.4 and 5.3 on January 19, 2021 more than a year ago.  Forecast 142632 had expected this event within about 50 km was likely around April 5. This epicenter is located at 103 degrees from the M 7.0 in the Loyalty Islands of March 31 and also at 103 degrees from the M 6.9 in Qinghai, China of January 7, 2022 and was probably promoted by energy from those sources." (April 1-2, 2022)

 

Today's event occurred within about half an hour of local solar midnight and may have been promoted by high tidal stresses with the new moon which maximize near this hour. Forecast 142632 had expected today's activity within about 100 km was likely around April 5.

 

NEIC reported this earthquake of M 5.1 in Argentina was felt with intensity II-III in the area(s) of Argentina in San Juan, Mendoza, Cordoba (IV) and in Vina Del Mar, Valparaiso, Chile.

 

O:  3APR2022 05:16:36  31.5S   67.0W Mw=5.0  EMSC   LA RIOJA, ARGENTINA          

O:  3APR2022 05:16:36  31.5S   67.0W Mw=5.1  ANSS   LA RIOJA, ARGENTINA          

P:  5APR2022 142632    31.0S   68.0W 4.0-5.4 AAAAA  Central Chile              

 

An unusual earthquake of M 4.2 occurred in the western Mediterranean Sea today.

It was not reported felt in this region near Southern France. An earthquake of M 4.7 hit about 200 km southwest of this on March 8, 2018 but the last within about 100 km of today's epicenter with larger magnitude was an M 4.3 on January 26, 1995. Forecast 142524 had expected enhanced seismicity in this region  in early April.

 

O:  2APR2022 17:50:16  37.7N    8.2E ML=4.2  EMSC   WESTERN MEDITERRANEAN SEA    

P:  3APR2022 142524    37.0N    3.0E 3.0-4.6 AACAA  Western Mediterranean      

 

The strongest earthquake in the U.S. or Canada today was an M 3.4 in northern California. NEIC reported this earthquake of M 3.5 in Northern California was felt with intensity II-III in the area(s) of Northern California in Willow Creek, Salyer, Hyampom, McKinleyville and Etna. This is the first earthquake in this region of M>=3.4 since an M 4.4 on February 6, 2019. Forecast 142478 had expected activity in this area was likely to be enhanced in early April, 2022. This epicenter is at the fourth node (90 degrees) from the Loyalty Islands and may have been promoted by energy from that source.

 

O:  2APR2022 10:31:04  41.0N  123.5W ML=3.4  EMSC   NORTHERN CALIFORNIA          

O:  2APR2022 10:31:04  41.0N  123.5W ML=3.5  ANSS   NORTHERN CALIFORNIA          

P:  8APR2022 142478    39.8N  123.5W 2.5-4.8 CBAAA  Central California         

 

 

MODERATE QUAKES IN ARGENTINA, JAVA AND LOYALTY ISLANDS

 

EARTHQUAKE SUMMARY FOR APRIL  1, 2022

 

The strongest earthquake felt in the world today was an M 5.2 in Argentina. NEIC reported intensity V in La Ligua, Valparaiso, Chile and IV in Vina del Mar, Chile and San Juan, Argentina. It was also felt with intensity II-III in Mendoza and Cordoba, Argentina and in Santiago, Chile. This is the strongest earthquake within about 150 km of this epicenter in Argentina since an M 6.4 and 5.3 on January 19, 2021 more than a year ago.  Forecast 142632 had expected this event within about 50 km was likely around April 5. This epicenter is located at 103 degrees from the M 7.0 in the Loyalty Islands of March 31 and also at 103 degrees from the M 6.9 in Qinghai, China of January 7, 2022 and was probably promoted by energy from those sources.

 

O:  1APR2022 11:28:03  31.4S   68.0W Mw=5.2  EMSC   SAN JUAN, ARGENTINA          

P:  5APR2022 142632    31.0S   68.0W 4.0-5.4 BAAAA  Central Chile              

 

An M 5.2-5.3 was also felt in Java Indonesia today. NEIC reported maximum intensity VI in Palabuhanratu, Java with intensity II-III in Pamulang, Padalarang, Pandung, Java and in Jakarta, Indonesia. This appears to be an aftershock of several M 5.3 earthquakes in mid-March and a subsequent regional volcanic eruption. Forecast 142132 had expected this area would likely see enhanced seismicity around March 31.

 

O:  1APR2022 07:14:12   7.3S  106.1E Mw=5.1  EMSC   JAVA, INDONESIA              

O:  1APR2022 07:14:12   7.3S  106.1E Mw=5.3  ANSS   JAVA, INDONESIA              

P: 31MAR2022 142132     9.0S  106.0E 4.0-5.6 ABAAA  So. of Java                

 

An earthquake of M 4.9 also occurred in northern Mindanao, Philippines today.

NEIC reported this earthquake of M 4.9 in Mindanao, Philippines was felt with intensity II-III in the area(s) of Mindanao, Philippines in Brasilisa, Caraga.  This event follows a similar M 5.0 in this region earlier in the day. The last earthquake of M>=4.9 before this within about 150 km of this epicenter was an M 4.9 on November 23, 2021. This is on the geomagnetic equator and occurred near the maximum of today's geomagnetic storm. It is likely it was triggered by effects from the current geomagnetic storm as noted in this and past summaries:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 17. High latitudes saw minor storms with AP 35.  This continues the strongest geomagnetic storm since AP reached 40 on March 13, 2022. High latitude geomagnetic field also saw quiet conditions with AP 35. A strong geomagnetic storm began late on March 30 and continued through the first 9 hours of March 31 at least. Moderate increases in seismicity at high latitudes and near the geomagnetic equator may occur in the next three days including the possibility of a major earthquake at this time." (March 31-April 1, 2022)

 

More enhanced seismicity is expected in this area as this geomagnetic storm continues. Forecast 142438 and 142112 had expected this activity in late March or early April.

 

O:  1APR2022 09:32:01   9.1N  126.7E mb=4.9  EMSC   MINDANAO, PHILIPPINES        

P:  3APR2022 142438    11.0N  126.0E 3.5-4.9 ABAAA  Luzon, Philippines         

P: 26MAR2022 142112     9.0N  127.0E 4.0-5.4 BAAAA  Halmahera                  

 

The strongest earthquakes in the world today occurred with M 5.5-5.6 in the aftershock sequence in the Loyalty Islands. The M 5.5 occurred within minutes of local solar midnight and was probably promoted by high tidal stresses with the new moon. Forecasts a42360 and 142623 had expected enhanced seismicity in the Loyalty Islands in late March or early April.

 

O: 02APR2022 04:15:03  22.8S  170.7E Mw=5.6  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O:  1APR2022 13:05:17  22.5S  170.4E Mw=5.5  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P:  2APR2022 142623    21.0S  170.0E 4.0-5.4 ABAAA  Loyalty Islands            

P: 31MAR2022 142360    22.0S  172.0E 4.0-5.4 AABAA  Loyalty Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in Southern Alaska. NEIC reported this earthquake of M 3.4-3.7 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska in Chugiak and Eagle River. The last event of larger magnitude within about 150 km of this epicenter was an M 3.9 on March 6, 2022 and an M 5.2 on February 6, 2022 to the northeast of today's epicenter. Forecast 142590 had expected today's event within about 100 km was likely around April 3.

 

O: 01APR2022 08:15:18  61.8N  149.6W ML=3.0  EMSC   SOUTHERN ALASKA

O:  1APR2022 10:55:37  61.5N  149.9W mb=3.7  EMSC   SOUTHERN ALASKA              

P:  3APR2022 142590    62.7N  149.3W 3.2-4.9 ABAAA  Central Alaska             

 

A second light earthquake hit the region of Vermont today. This follows a similar M 2.1 in Vermont earlier in the day. It occurred within minutes of local solar noon and was probably promoted by high tidal stresses with the new moon. This activity had been discussed in the previous issue of this summary as:

 

"An unusual earthquake of M 2.1-2.3 shook the area of Vermont today. This is the first earthquake located in Vermont of M>=2 since an M 2.3 on September 10, 2019. An M 2.9 hit New Hampshire on February 2, 2022 and in Maine with M 2.2 on  December 1, 2021 - the only such regional events in the past 1.5 years. Forecasts 142275 had expected this activity was likely at the end of March or in early April, 2022. Today's event occurred near local solar midnight with the new moon and was probably promoted by high tidal stresses as noted in the tidal forecast for seismicity in previous issues of this summary:

 

 

"The new moon arrived on April 1, 2022 at 06:24 UT. Longitudes which were at local solar midnight at this time are near 100 West while those at local solar noon are near 80 East. These include, in the west areas of Central U.S. and central Mexico and portions of the East Pacific Rise and in the east in China, Pakistan and India in central Asia and in the South Indian Ocean. These are the regions most likely to see tidal triggering at this time and during the next week. Other areas can also be promoted by tidal stresses. These are most likely to occur near local solar noon and midnight." (March 28-April 1, 2022)

 

O:  1APR2022 16:56:09  43.7N   72.4W ML=2.2  EMSC   VERMONT                      

P: 31MAR2022 142275    45.0N   73.0W 2.0-4.1 ABAAA  New England                

 

An earthquake of M 4.3-4.8 shook regions of South Island, New Zealand today. GEONET reported this earthquake was felt with moderate intensity in the area of Christchurch, South Island, New Zealand. 432 felt reports were published including 297 of weak and 112 of light shaking; 16 moderate; 2 strong; 1 severe and 2 extreme shaking in northern South Island. The last earthquake of M>=4.8 within about 150 km of this epicenter was an M 4.9 on February 11, 2017. An M 6.1 shook the region on April 24, 2015. Forecast 142385 had expected this event within about 150 km was likely at the end of March or in early April.

 

O:  1APR2022 10:36:46  43.0S  171.8E mb=4.3  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 01APR2022 10:36:46  43.0S  171.8E MS=4.8  GEONET Felt with moderate intensity

P: 27MAR2022 142385    42.0S  173.0E 3.0-5.1 BAAAA  So. Island, N.Z.           

 

 

M

STRONG AFTERSHOCKS CONTINUE IN LOYALTY ISLANDS

 

EARTHQUAKE SUMMARY FOR MARCH 31, 2022

 

Strong aftershocks continued today in the region of the Loyalty Islands. The largest of these was reported by NEIC to have been felt with intensity V in Tadine, New Caledonia and II in Noumea. The strongest of these aftershocks was an M 6.5. This activity occurred as a strong geomagnetic storm occurred which may have helped promote it. This summary had noted this possibility as:

 

"The geomagnetic field saw stormy conditions today. The AP level was 27. High latitudes also saw major storms with AP 43.  This is the strongest geomagnetic storm since AP reached 40 on March 13, 2022. High latitude geomagnetic field also saw quiet conditions with AP 35. A strong geomagnetic storm began late on March 30 and continued through the first 9 hours of March 31 at least. Moderate increases in seismicity at high latitudes and near the geomagnetic equator may occur in the next three days including the possibility of a major earthquake at this time." (March 31-April 1, 2022)

 

This series began earlier in the day following an X1.3 solar flare and was likely triggered by SFE as reported in the previous issue of this summary:

 

 

"A series of major earthquakes including an M 6.9 and 7.0 occurred in the region of the Loyalty Islands today. These were reported by NEIC to have been felt in New Caledonia with V in Tadine, IV in Noumea and III in Bouloupari and in Vila Shefa, Vanuatu. This activity began shortly after an X1.3 class solar flare, the strongest such flare since July 3, 2021 ...

 

It is likely that this flare led to the M 6.9 in the Loyalty Islands near the geomagnetic equator several hours later. The mainshock of M 7.0 was also associated with a C-class solar flare which maximized near the time of this event. The last solar flare of significantly larger size occurred in September 2017" (March 30-31, 2022)

 

Like the M 7.0 in the Loyalty Islands on March 30, the M 6.5 aftershock today occurred minutes after a major solar flare of M9.3 that occurred with the following SWPC parameters:

 

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

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

 

4520       1817   1835      1845   M9.6      (March 31, 2022)   7.6E-02  

 

The strongest earthquake outside of the Loyalty Islands today occurred at the beginning of this flare in the Kuril Islands with M 5.3 and was probably promoted by SFE associated with this flare. The parameters of this earthquake were:

 

O: 31MAR2022 18:19:30  46.1N  151.0E mb=5.3  EMSC   KURIL ISLANDS                

P: 26MAR2022 142290    46.0N  153.0E 3.5-5.4 BABAA  So. Kurils                 

 

An M 3.6 in the northern Gulf of California occurred at the maximum output of this flare as:

 

O: 31MAR2022 18:38:28  30.7N  114.3W ML=3.6  EMSC   GULF OF CALIFORNIA           

P: 27MAR2022 142175    31.0N  114.5W 3.5-4.9 BAAAA  Gulf of California         

 

Forecast 142360 had expected today's activity in the Loyalty Islands within about 100 km was likely around March 31.

 

O: 31MAR2022 07:41:36  22.3S  170.2E mb=4.7  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 31MAR2022 07:22:00  22.5S  170.1E mb=5.1  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 31MAR2022 15:30:47  22.5S  170.8E Mw=5.1  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 31MAR2022 10:16:21  22.6S  170.9E mb=5.1  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 31MAR2022 15:29:53  22.6S  170.7E mb=5.1  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 31MAR2022 19:50:41  22.6S  170.8E Mw=6.5  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 31MAR2022 21:59:44  22.7S  170.7E mb=5.1  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 01APR2022 01:08:13  22.9S  170.6E mb=4.7  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 31MAR2022 15:54:28  22.2S  170.1E Mw=5.5  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 31MAR2022 142360    22.0S  172.0E 4.0-5.4 AABAA  Loyalty Islands            

 

A moderate earthquake of M 4.8 struck the Tokyo, Japan area today. NEIC reported maximum intensity IV in Ichihara, Yotsukaido and Funabashi, Matsudo Chiba and in Tokyo Prefectures, Japan. News reports indicated this earthquake was widely felt in the region of Tokyo, Japan but no major damage was reported. Similar events of M 4.8-5.0 hit the region near Tokyo as an M 4.9 on December 12 and an M 5.0 on December 1, 2021 but the last of significantly larger magnitude was an M 5.9 on October 7, 2021. Forecast 142223 had expected today's activity was likely around March 31.

 

O: 31MAR2022 11:52:12  35.5N  140.0E mb=4.8  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 31MAR2022 142223    36.0N  142.0E 4.0-5.4 AABAA  Off East Coast Honshu      

 

The strongest earthquake in the U.S. or Canada today occurred in the Alaska Peninsula with M 4.4. The last earthquake of larger magnitude in the Alaska Peninsula was an M 5.2 on February 20, 2022. These are aftershocks of the M 8.2 which hit the area on July 29, 2021. Today's event occurred within minutes of local solar noon and was probably promoted by high tidal stresses which maximize near this hour. Forecast 142297 had expected today's activity in the Alaska Peninsula was likely around March 29.

 

O: 31MAR2022 22:50:07  55.8N  159.7W mb=4.4  EMSC   ALASKA PENINSULA             

P: 29MAR2022 142297    54.7N  156.9W 3.5-5.3 ABBAA  Alaska Peninsula           

 

A series of light earthquakes in Central California followed an M 3.1-3.3 in that region today. The last earthquake of equal or greater magnitude in this area within about 50 km of this epicenter was an M 3.4 on February 21, 2022 and prior to that an M 3.7 on October 20, 2021 An M 4.1 hit about 50 km southeast of this epicenter on March 13, 2022. Forecast 142197 had expected today's activity within about 15 km was likely at the end of March.

 

NEIC reported these earthquakes of M 3.3 and 2.8 in Central California were felt with intensity II-III in the area(s) of Central California in San Juan Bautista, Salinas, Hollister, Gilroy, Marina, Hollister, Seaside, Monterey, Morgan Hill, Los Banos and San Ramon. An aftershock M 2.7 was felts with intensity II-III in Salinas, San Jose, Los Banos and San Ramon.

 

O: 01APR2022 02:03:44  36.6N  121.2W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 01APR2022 00:50:34  36.8N  121.5W Md=2.0  EMSC   CENTRAL CALIFORNIA

O: 01APR2022 00:58:29  36.8N  121.5W ML=2.5  EMSC   CENTRAL CALIFORNIA

O: 01APR2022 02:28:12  36.8N  121.6W ML=2.6  EMSC   CENTRAL CALIFORNIA

O: 31MAR2022 22:39:03  36.8N  121.6W ML=3.1  EMSC   CENTRAL CALIFORNIA

O: 31MAR2022 22:39:03  36.8N  121.6W ML=3.3  ANSS   CENTRAL CALIFORNIA

O: 01APR2022 04:21:57  36.9N  121.0W Md=2.2  EMSC   CENTRAL CALIFORNIA

O:  1APR2022 01:59:21  36.6N  121.2W Md=2.3  EMSC   CENTRAL CALIFORNIA           

P: 23MAR2022 142197    36.7N  121.4W 2.5-4.8 CAAAA  Central California         

P: 28MAR2022 142197    36.2N  121.8W 2.5-4.7 BAAAA  Central California         

 

An unusual earthquake of M 2.1-2.3 shook the area of Vermont today. This is the first earthquake located in Vermont of M>=2 since an M 2.3 on September 10, 2019. An M 2.9 hit New Hampshire on February 2, 2022 and in Maine with M 2.2 on  December 1, 2021 - the only such regional events in the past 1.5 years. Forecasts 142275 had expected this activity was likely at the end of March or in early April, 2022. Today's event occurred near local solar midnight with the new moon and was probably promoted by high tidal stresses as noted in the tidal forecast for seismicity in previous issues of this summary:

 

 

"The new moon arrived on April 1, 2022 at 06:24 UT. Longitudes which were at local solar midnight at this time are near 100 West while those at local solar noon are near 80 East. These include, in the west areas of Central U.S. and central Mexico and portions of the East Pacific Rise and in the east in China, Pakistan and India in central Asia and in the South Indian Ocean. These are the regions most likely to see tidal triggering at this time and during the next week. Other areas can also be promoted by tidal stresses. These are most likely to occur near local solar noon and midnight." (March 28-April 1, 2022)

 

O:  1APR2022 06:11:30  44.6N   71.6W ML=2.1  EMSC   VERMONT                       

O:  1APR2022 06:11:31  44.6N   71.6W MB=2.3  ECAN of Coaticook, QC               

P: 22MAR2022 142275    43.0N   71.0W 2.0-4.1 CBAAA  New England                

P: 31MAR2022 142275    45.0N   73.0W 2.0-4.1 AAAAA  New England                

 

Elevated seismicity also continued in western Texas today. The strongest of these was an M 3.8. This event occurred within a couple of minutes of local solar midnight and was probably promoted by high tidal stresses as it  occurred near the maximum longitude of tidal stresses and within minutes of the new moon (see aobe) when such stresses maximize. Larger earthquakes occurred in this region most recently as an M 4.6 on March 25 and an M 4.3 on March 5, 2022.  

Forecast 142228 had expected this activity was likely at the end of March or in early April.

 

O: 01APR2022 06:27:52  31.6N  104.4W ML=2.8  EMSC   WESTERN TEXAS

O: 01APR2022 02:02:20  31.7N  104.4W ML=2.0  EMSC   WESTERN TEXAS

O: 01APR2022 06:56:22  31.7N  104.4W ML=3.8  EMSC   WESTERN TEXAS

O:  1APR2022 06:27:52  31.6N  104.4W ML=2.8  EMSC   WESTERN TEXAS                

P: 27MAR2022 142228    31.6N  103.6W 2.0-4.0 BAAAA  SW U.S.A                   

 

Another earthquake that was probably promoted by high tidal stresses with the new moon today was an M 4.9 southeast of Eastern Island. This event occurred within minutes of local solar noon, a time and longitude when tidal stresses were maximized with the current new moon.  The last earthquake in this area of equal of greater magnitude was an M 5.4 on December 13, 2021. Forecast 142381 had expected enhanced seismicity in this area was likely at the end of March. This earthquake occurred near the start of the M9.6 flare today.

 

O: 31MAR2022 18:02:18  37.5S   95.8W mb=4.9  EMSC   SOUTHEAST OF EASTER ISLAND   

P: 28MAR2022 142381    41.0S   91.0W 4.0-5.5 BCCAA  Chile Rise