MODERATE SEISMICITY IN OCEAN RIDGE AREA

 

EARTHQUAKE SUMMARY FOR JULY 9, 2020

 

It was another quiet day in global seismicity. The largest earthquakes in the world today occurred in ocean ridges. These included an M 5.3 on the Carlsberg Ridge and an M 4.9 in the Southwest Indian Ridge. These remote earthquakes were not reported felt in these areas. The M 5.3 in the Carlsberg Ridge is the largest in that region since events of M 5.5 on November 14, 2019 and  on November 27, 2019 far to the north (500-1000 km) of today's epicenter. Today's event had been expected in forecast 125244 within about 200 km of this epicenter. 

 

O: 10JUL2020 06:29:42   2.6S   68.1E Mw=5.3  EMSC   CARLSBERG RIDGE              

P: 10JUL2020 125244     1.0S   67.0E 4.0-5.4 ABAAA  Indian Ocean               

 

The earthquake of M 4.9 in the Southwest Indian Ridge is the strongest within about 250 km of that epicenter since an M 5.9 on March 6, 2020. The only other such events in the region in the past year occurred on January 26, 2020 (M 5.1) and September 24, 2019 M 6.1 ..).  Forecast 125462 had expected activity in this area was likely around July 11. This earthquake is located near the antipode of Southern California but is probably not large enough to have significant effect on regional seismicity in this area.

 

O:  9JUL2020 16:09:08  31.7S   58.3E mb=4.9  EMSC   SOUTHWEST INDIAN RIDGE       

P: 11JUL2020 125462    34.0S   55.0E 4.0-5.5 ACCAA  So. Indian Ocean           

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in Central Alaska. NEIC reported this earthquake of M 3.6 in Central Alaska  was felt with intensity II-III in the area(s) of Central Alaska at Talkeetna, Palmer, Chugiak, Eagle River and Anchorage. The last earthquake in central Alaska within about 150 km of this epicenter with M>=3.7 occurred on April 16, 2020 with M 3.8. The last in this area with M>=4 was an M 4.2 five months ago on February 15, 2020. Forecast 125414 had expected this event was likely in this area around July 9.

 

 

O:  9JUL2020 16:44:18  62.3N  148.7W mb=3.7  EMSC   CENTRAL ALASKA               

P:  9JUL2020 125414    61.2N  147.4W 3.2-4.9 ABAAA  Central Alaska             

 

 

MODERATE QUAKE SOUTH OF AUSTRALIA

 

EARTHQUAKE SUMMARY FOR JULY 8, 2020

 

The strongest earthquake in the world today was an M 5.6 south of Australia  in the western Indian-Antarctic Ridge. It was not reported felt in this remote area. The last earthquake within about 300 km of this epicenter with M>=5.6 was an M 5.6 on August 30, 2012 and an M 5.6 on April 27, 2010. No events of M>5.6 have hit the area in the past 30 years.  Forecast 125470 had expected today's epicenter in early July was likely to the east of today's epicenter.

 

O:  8JUL2020 09:08:24  49.8S  114.3E Mw=5.6  EMSC   WESTERN INDIAN-ANTARCTIC RIDGE

P:  3JUL2020 125470    49.0S  122.0E 4.0-5.8 BACAA  So. of Australia            

 

An M 4.6 also occurred in the Falkland Islands east of Southern South America today. It was not reported felt in this area. The last earthquake in the Falkland Islands of M>=4.6 was an M 4.9 on March 20, 2020 and prior to that an M 4.8 on December 8, 2018. The last event in the region with M>=5 was an M 5.4 on November 25, 2013. Forecast 125473 had expected this activity to the southeast of this epicenter was likely around July 11.

 

O:  8JUL2020 18:08:19  54.2S   60.4W mb=4.6  EMSC   FALKLAND ISLANDS REGION      

P: 11JUL2020 125473    60.0S   44.0W 3.0-5.5 BCCAA  So. So. America            

 

The strongest earthquake felt in the world today was an M 5.1 in northern Colombia. This is the strongest event in Northern Colombia within about 200 km of this epicenter since an M 5.4 on January 24, 2019. Forecast 125228 had expected today's event within about 25 km of the epicenter was likely around July 9.

 

NEIC reported this earthquake of M 5.1 in Northern Colombia  was felt with intensity III-IV in the area(s) of Colombia at Floridablanca, Bucaramanga, Cota and Subachoque, Chia, Cajica, Cepita, Maripi, Sutatausa and Zipaquira.

 

O:  9JUL2020 03:22:48   6.8N   73.0W Mw=5.1  EMSC   NORTHERN COLOMBIA            

P:  9JUL2020 125228     7.0N   73.0W 4.0-5.6 AAAAA  Colombia                   

 

UNUSUAL QUAKES SHAKE POLAND AND SOUTH AFRICA

 

EARTHQUAKE SUMMARY FOR JULY 7, 2020

 

Although no earthquakes of M>=5.1 occurred today in the world, events of M 4.4 and 4.9 shook the unusual regions of South Africa and Poland today. Still effects from the geomagnetic storm and from the full moon tides appear to have dissipated to background stresses. The M 4.9 in Poland is the strongest within about 200 km of that epicenter in Poland since an M 4.9-5.0 on July 20, 2018. The last of larger magnitude in the area was an M 5.1 on July 23, 2008. The strongest in the region in the past 30 years was an M 5.4 on December 31, 1999.  Forecast 125405 expected today's event within about 50 km of this epicenter in Poland was likely around July 6, 2020.

 

NEIC reported this earthquake of M 4.9 in Poland  was felt with intensity V in Lubin and Polkowice Dolnoslaskie, Poland and II-III in the area(s) of Poland at Dzierzonlow. This epicenter is located at 104 degrees from the M 6.8 in northern Chile of June 3, 2020 and may have been promoted by energy from that source. An M 4.3 also shook the region of Bosnia today at this distance from northern Chile as did an M 5.1 in the Kodiak Island area of Alaska. It is also at the fourth node (90 degrees) from the M 7.5 in Oaxaca, Mexico of June 23 and was probably enhanced by energy from that epicenter.

 

O:  8JUL2020 05:18:59  51.6N   16.1E mb=4.9  EMSC   POLAND                       

O:  8JUL2020 06:18:15  51.6N   16.2E ML=3.8  EMSC   POLAND                       

P:  6JUL2020 125405    51.0N   16.0E 3.0-4.7 AAAAA  Poland                     

 

The earthquake in South Africa was also unusually large. The last earthquake within about 250 km of this epicenter with M>=4.4 occurred on March 22, 2019 with M 4.9.  Forecast 125449 expected today's event within about 50 km of this epicenter was likely around July 4.

 

NEIC reported this earthquake of M 4.4 in South Africa  was felt with intensity II-III in the area(s) of South Africa at Potchefstroom, North West.

 

O:  7JUL2020 10:44:14  26.5S   27.4E mb=4.4  EMSC   SOUTH AFRICA                 

P:  4JUL2020 125449    27.0S   27.0E 3.0-4.4 AAAAA  Rep. South Africa          

 

 

The strongest earthquake in the U. S. or Canada today was also the largest in the world today. This event of M 5.1 in the Kodiak Island area of Alaska was not reported felt in this epicentral area. It is the largest event in this area since an M 5.2-5.3 on April 17, 2020 - the only  other such event in the past 8 months. Forecast 125394 had expected today's activity to the southwest was likely around July 11.

 

 

O:  8JUL2020 01:07:03  56.2N  153.9W Mw=5.1  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 11JUL2020 125394    54.7N  156.9W 3.5-5.0 BBBAA  Alaska Peninsula           

 

GEOMAGNETIC STORM PROMOTES EQUATORIAL SEISMICIY

 

EARTHQUAKE SUMMARY FOR JULY 6, 2020

 

Several strong earthquakes occurred near the geomagnetic equator today. These

included an M 6.6 in the Java Sea, Indonesia and an M 6.3 south of Guam in the Yap region of Micronesia. This summary had expected an enhancement of seismicity along the geomagnetic equator in the previous issue as:

 

 

"There have been no earthquakes in the world of M>=5.5 since this quiet began.

Among factors helping to increase global seismicity at this time is the full moon of July 5 and a moderate geomagnetic storm today, the strongest since May 30, 2020 when AP reached 14. These seismic enhancement effects area likely to bring a strong earthquake near the geomagnetic equator or at high latitudes in the next several days. The effects of this  storm are summarized here as:

 

"The geomagnetic field saw slightly disturbed conditions today. The AP level was 10.  High latitude geomagnetic field also saw active conditions  with AP at 24. Geomagnetic disturbances of this level can help to promote seismicity near the geomagnetic equator and high-latitude seismicity. The M 5.5 in the region of Alaska occurred at the peak of this disturbance and may have been promoted by geomagnetic effects." (July 5-6, 2020)

 

The strongest earthquake in the world today, and the strongest in the past two weeks was an M 6.6 in the Java Sea of Indonesia. This is near the local geomagnetic equator and was probably enhanced by the geomagnetic storm today (see above). It is located in central Indonesia, an area expected to see a strong earthquake at this time due to its location with respect to the M 7.5 in Oaxaca, Mexico of June 23 as noted in previous issues of this report:

 

"... One area which is still quiet is at 144 degrees from Oaxaca - in central Indonesia, an active zone where a strong earthquake has not occurred with the current seismic enhancements." (June 27, July 6, 2020)

 

A strong earthquake of M 6.6 hit the Java Sea today. It was located at a deep focal depth of 538 km and was thus felt over a wide area including Java, Yogyakarta, Indonesia with little damage. NEIC reported maximum shaking in Surakarta, Java and Sewon, Yogyakarta of IV with II-III in Rembang, Grogol, Depok, Yogyakarta, Wonogin, Kasihan, Sewon, Bambanglipuro, and Srandakan, Indonesia. A regional aftershock of the M 6.6 in Java was reported with M 5.1. NEIC reported it was felt in Banten and Java Indonesia at Serpong, Ciputat, Pamulang, Clomas, Bogor, Depok and Jakarta. This event of M 6.6 is the strongest within about 250 km of this epicenter  since an M 6.7 on September 2, 1992 about 250 km northeast of today's epicenter. An M 7.4-7.5 also hit about 350 km west of this on August 8, 2007, the only such events in the area in the past 30 years.  Forecast 125254 had expected today's event south of Java around July 6.

 

O:  6JUL2020 22:54:49   5.6S  110.7E Mw=6.6  EMSC   JAVA SEA                     

P:  6JUL2020 125254     8.0S  108.0E 4.0-5.4 ACCAA  So. of Java                

 

The area of Yap,  Micronesia and the northern Marianas was active today. These

surround the local geomagnetic equator and were expected to see enhanced seismicity at this time (see above). The strongest of these was an M 6.2 in the State of Yap, Micronesia. This is the strongest earthquake within about 200 km of this epicenter since an M 6.3 on September 26, 1993, the only other such event  in the area in the past 30 years. Forecast 125284 had expected this earthquake within about 100 km was likely around July 7.

 

O: 06JUL2020 18:16:18  12.0N  140.3E Mw=6.2  EMSC   STATE OF YAP, MICRONESIA

O: 07JUL2020 01:20:54  12.2N  140.2E mb=4.7  EMSC   STATE OF YAP, MICRONESIA

O: 06JUL2020 21:01:09  12.6N  140.4E mb=5.1  EMSC   STATE OF YAP, MICRONESIA

O:  6JUL2020 15:30:29  11.0N  138.7E mb=5.0  EMSC   STATE OF YAP, MICRONESIA     

P:  7JUL2020 125284    11.0N  140.0E 4.0-5.4 AAAAA  So. Marianas/Guam          

 

A moderately strong earthquake of M 5.5 also occurred in the Northern Mariana/Volcano Islands region today. This is the strongest earthquake within about 200 km of this epicenter since an M 6.4 more than a year ago on June 28, 2019 and prior to that an M 5.9 on December 21, 2016. Forecast 125303 had expected today's event in this region around July 4.

 

 

O:  6JUL2020 12:58:04  21.0N  144.8E Mw=5.5  EMSC   MAUG ISLANDS REG, N. MARIANA I

P:  4JUL2020 125303    22.0N  144.0E 4.0-5.4 AAAAA  Volcano Islands            

 

 

An M 5.6 also occurred in the Izu Islands south of Honshu, Japan today.

The last earthquake in the Izu Islands within about 150 km of this epicenter with larger magnitude was an M 5.8 on April 5, 2019 and prior to that an M 5.9  on August 25, 2016. Forecast 125317 had expected this region was likely to see enhanced seismicity around July 10.

 

O:  6JUL2020 18:19:09  31.5N  138.1E Mw=5.6  EMSC   IZU ISLANDS, JAPAN REGION    

P: 10JUL2020 125317    33.0N  137.0E 3.5-4.9 BBAAA  Central/So. Honshu Japan   

 

The strongest earthquake felt in the U.S. or Canada today was an M 3.9 off the coast of Oregon. It was reported felt along the coast of Oregon with III in Lincoln City and I in Yachats, Oregon. The last earthquake of equal or larger magnitude within about 100 km of this epicenter occurred on October 2, 2019 with M 3.9. The last of significantly larger magnitude was an M 5.4 on August 16, 2019. Two event of M 4.1 hit the area during the regional activation of early July 2, 2019. Forecast 125382 had expected today's event within about 50 km was likely around July 6.

 

O:  6JUL2020 12:28:12  43.6N  129.9W mb=3.9  EMSC   OFF COAST OF OREGON          

P:  6JUL2020 125382    44.3N  129.4W 3.0-4.4 AAAAA  Off Coast of Oregon        

 

GLOBAL SEISMICITY BEGINS TO CLIMB OUT OF QUIET PERIOD

 

EARTHQUAKE SUMMARY FOR JULY 5, 2020

 

Seismicity around the world today appeared to be climbing out of the quiet period of the past 10 days. This had been announced in this summary on June 28-29, 2020, 10 days ago.

 

"Seismicity around the world today was returning to the quiet pre-Kermadec levels. It is expected that this will be the pattern of seismicity for several weeks to come. While an occasional moderately large to large quake is likely, much of the available seismic energy was dissipated in the unusually active seismic triggering following the M 7.4 in the Kermadec Islands, the M 7.5 in Oaxaca, Mexico and the annular solar eclipse across southern Asia. Most of the areas which were likely to have seen enhanced seismicity from these events have now seen it as moderately large to large earthquakes. Further moderate seismicity is likely in these areas in coming days, and the possibility of a large quake in these regions cannot be precluded at this time. One area which is still quiet is at 144 degrees from Oaxaca - in central Indonesia, an active zone where a strong earthquake has not occurred with the current seismic enhancements.  The absence of strong ocean storms, geomagnetic disturbances and/or other triggering agents for seismic enhancement at this time suggests quiet upcoming conditions." (June 29, 2020)

 

There have been no earthquakes in the world of M>=5.5 since this quiet began.

Among factors helping to increase global seismicity at this time is the full moon of July 5 and a moderate geomagnetic storm today, the strongest since May 30, 2020 when AP reached 14. These seismic enhancement effects area likely to bring a strong earthquake near the geomagnetic equator or at high latitudes in the next several days. The effects of this  storm are summarized here as:

 

"The geomagnetic field saw slightly disturbed conditions today. The AP level was 10.  High latitude geomagnetic field also saw active conditions  with AP at 24. Geomagnetic disturbances of this level can help to promote sesismicity near the geomagnetic equator and high-latitude seismicity. The M 5.5 in the region of Alaska occurred at the peak of this disturbance and may have been promoted by geomagnetic effects." (July 6, 2020)

 

The strongest earthquake in the world today was an M 5.9 in central Vanuatu. NEIC reported it was felt with intensity IV in Luganville,Sanma, Vanuatu. This epicenter is at 101 degrees from the M 7.5 in Oaxaca, Mexico of June 23 and was probably promoted by energy from that source. An event of M>=5.9 last hit the area within about 200 km of this epicenter a half year ago on December 14, 2019.

Forecast 125440 had expected today's event within about 50 km was likely around

July 7.

 

O:  5JUL2020 18:50:01  14.9S  167.4E Mw=5.9  EMSC   VANUATU                      

P:  7JUL2020 125440    15.0S  168.0E 4.0-5.6 AAAAA  Vanuatu Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 5.5 in the Alaska Peninsula near Unimak Island. It was not reported felt in this remote area. This event occurred near local solar midnight and was probably enhanced by tidal stresses associated with the full moon which was nearly coincident with it (as well as with the maximum of today's geomagnetic disturbance). The tidal seismic forecast had read:

 

"The full moon arrived on July 5, 2020 at 04:44 UT. Longitudes at local midnight at this time are near 70 degrees West longitude and 110 East Longitude. These include seismic areas in Puerto Rico and the northern Caribbean and the western Coast of South and Central America in the west and western Indonesia in the east. These areas may see enhanced seismicity in the next several days. Enhanced seismicity is also possible in other areas but is not expected to be exceptional with this full moon." (July 3-6, 2020)

 

The last earthquake within about 200 km of today's earthquake south of Alaska with M>=5.5 occurred more than a year-and-a-half ago on December 31, 2018 with M 6.0. Forecast 125411 had expected today's event in this area was likely around July 4.

 

O:  5JUL2020 08:53:33  53.3N  160.4W mb=5.5  EMSC   SOUTH OF ALASKA              

O:  5JUL2020 21:45:58  53.3N  160.5W ml=3.3  EMSC   SOUTH OF ALASKA              

P:  4JUL2020 125411    54.3N  161.4W 3.5-5.1 AAAAA  Unimak Islands, Aleutians  

 

An M 4.5 aftershock also occurred today in the western Nevada aftershock zone near Tonopah, Nevada. NEIC reported it was felt with intensity IV in Gabbs, Nevada and II-III in Fallon, Glenbrook, Las Vegas, Nevada and in California at Bishop, June Lake, Yosemite, North Fork. Forecast 125310 had expected this activity was likely around July 5.

 

O: 05JUL2020 20:42:27  38.1N  118.0W ml=2.1  EMSC   NEVADA

O: 05JUL2020 21:27:56  38.1N  118.0W ml=2.4  EMSC   NEVADA

O: 05JUL2020 23:06:20  38.1N  118.0W ml=2.0  EMSC   NEVADA

O: 05JUL2020 18:01:05  38.2N  118.0W ML=2.8  EMSC   NEVADA

O: 05JUL2020 21:26:43  38.2N  118.0W ML=2.5  EMSC   NEVADA

O: 05JUL2020 22:04:34  38.2N  118.0W ML=2.3  EMSC   NEVADA

O: 05JUL2020 23:12:29  38.2N  118.1W ml=2.3  EMSC   NEVADA

O: 06JUL2020 06:10:37  38.2N  117.9W ml=3.4  EMSC   NEVADA

O:  6JUL2020 06:12:54  38.2N  117.9W mb=4.1  EMSC   NEVADA

O:  6JUL2020 06:12:54  38.2N  117.9W mb=4.5  ANSS   NEVADA                       

P:  5JUL2020 125310    38.0N  118.0W 2.5-4.5 AAAAA  California/Nevada area     

 

MODERATE QUAKE SHAKES NORTHERN ALGERIA

 

EARTHQUAKE SUMMARY FOR JULY 4, 2020

 

It was another in a series of quiet days in global seismicity. The most unusual

earthquake felt today was an M 4.6 in Northern Algeria.  NEIC reported this earthquake of M 4.5 in northern Algeria  was felt with intensity II-III in the area(s) of northern Algeria with V in Batna, Algeria.  An earthquake of M 5.0 hit west of this in Northern Algeria on March 26, 2020. The only other such event within about 200 km within the past year was an M 4.9 about 150 km to the north on January 24, 2020. Forecast 125324 had expected this activity was likely around July 4. This epicenter is near the antipode of the M 7.4 in the Kermadec Islands of June 18 and was probably promoted by focused energy from that event.

 

O:  4JUL2020 07:59:39  35.6N    6.3E mb=4.6  EMSC   NORTHERN ALGERIA             

P:  4JUL2020 125324    37.0N    5.0E 3.5-4.9 ABAAA  Algeria/Spain              

 

The strongest earthquake in the world today was an M 5.5 in Tajikistan. This  quake occurred near local solar noon and may have been enhanced by seismic energy from the full moon of July 5. The seismic forecast for that full moon has been published in this summary in previous issues as:

 

"The full moon arrived on July 5, 2020 at 04:44 UT. Longitudes at local midnight at this time are near 70 degrees West longitude and 110 East Longitude. These include seismic areas in Puerto Rico and the northern Caribbean and the western Coast of South and Central America in the west and western Indonesia in the east. These areas may see enhanced seismicity in the next several days. Enhanced seismicity is also possible in other areas but is not expected to be exceptional with this full moon." (July 3-5, 2020)

 

This epicenter is also near the path of the total solar eclipse of June 21 and may have been influenced by tidal effects associated with that event. Forecast 125047 had expected this event within about 100 km was likely at the end of June. The last earthquake within about 150 km of this epicenter with M>=5.5 occurred on January 24, 2020 with M 5.5. The last with larger magnitude was an M 5.8 on May 5, 2017.

 

O:  4JUL2020 09:53:00  39.1N   71.0E mb=5.5  EMSC   TAJIKISTAN                   

P: 28JUN2020 125047    39.0N   72.0E 3.8-5.3 CAAAA  Hindu Kush/Pakistan        

 

The strongest earthquake in the U.S or Canada today was an M 3.7 in the western Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last earthquake in this region within about 150 km of today's epicenter with M>=3.7 occurred on June 22, 2020 when an M 3.8 aftershock of an M 5.2 on June 19 occurred. Forecast 125397 had expected today's event was likely in this area around July 6.

 

O:  4JUL2020 15:55:46  51.3N  178.1W ml=3.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6JUL2020 125397    51.7N  179.7W 3.5-5.0 AAAAA  Andreanoff Isls, Aleutians 

 

 

 

SUBSOLAR HAWAII; PUERTO RICO SHAKE

 

EARTHQUAKE SUMMARY FOR JULY 3, 2020

 

The areas of Hawaii and Puerto Rico saw significantly enhanced seismicity today.

These areas are at 18-19 North latitude and are subsolar at this time when the sun reaches its zenith while passing over and is directly overhead at local solar noon in these two regions. In addition the full moon of July 5, 2020 is at its maximum while over Puerto Rico as noted in this summary:

 

"The full moon will arrive on July 5, 2020 at 04:44 UT. Longitudes at local midnight at this time are near 70 degrees West longitude and 110 East Longitude. These include seismic areas in Puerto Rico and the northern Caribbean and the western Coast of South and Central America in the west and western Indonesia in the east. These areas may see enhanced seismicity in the next several days. Enhanced seismicity is also possible in other areas but is not expected to be exceptional with this full moon." (July 4, 2020)

 

The strongest felt earthquake of the day in the world was an M 5.3 aftershock in the southern Puerto Rico aftershock zone. It was felt with some damage with intensity VI in Ensenada and V in Lajas, Guanica, Sabana Grande, Cabo Rojo, San German, Yauco, Guayanilla and IV in Hormigueros and Maricao, Puerto Rico among others. It was preceded by, among other events, an M 4.9-5.1 which was also widely felt in this area of Puerto Rico. A number of light to moderate aftershocks were also felt. The area has been active in the previous week as noted in the June 28 issue of this summary:

 

"A series of moderate earthquakes in the north Atlantic Ocean today culminated

with a pair of strongly felt earthquakes in southern Puerto Rico. This pair of moderate earthquakes of M 4.7 and 4.9 shook the southern Puerto Rico aftershock zone near Ponce today. NEIC reported these were felt with maximum intensity V in Puerto Rico at Ensenada, Guanica, Sabana Grande, Guayanilla, San German  and Ponce and IV in Lajas, Yauco, Cabo Rojo, Penuelas and Hormigueros. The M 4.9 is the strongest aftershock in southern Puerto Rico in the vicinity of The M 6.5 of January 7, 2020 since an M 5.4 on May 2, 2020 and an M 5.0 on  February 4, 2020. Forecast 125004 had expected today's activity was likely around June 27." (June 27-28, 2020)

 

The first of today's moderate quakes in Puerto Rico occurred near local solar noon and was probably enhanced by tidal effects from the full moon of July 5 which maximizes over Puerto Rico. Other earthquakes of M>=4 today in  Puerto Rico included the M 5.3 aftershock as well as events of M 4.2, 4.3 and 4.4 Forecast 125282 had expected today's activity within about 10 km of these epicenter was likely around July 5.

 

O: 03JUL2020 13:54:50  17.9N   67.0W Mw=5.1  EMSC   PUERTO RICO REGION

O: 03JUL2020 21:17:38  17.9N   67.0W mb=4.2  EMSC   PUERTO RICO REGION

O: 03JUL2020 20:58:19  17.9N   67.0W mb=4.3  EMSC   PUERTO RICO

O: 03JUL2020 21:00:07  17.9N   67.0W mb=4.4  EMSC   PUERTO RICO REGION

O: 03JUL2020 20:49:46  17.9N   67.0W mb=5.3  EMSC   PUERTO RICO REGION

P:  5JUL2020 125282    18.0N   67.0W 3.4-4.9 AAAAA  Puerto Rico                

 

 

The strongest earthquake in the U.S. or Canada today occurred in Hawaii with M 4.7. NEIC reported it was felt with intensity IV in Hawaii at Hakalau, Pahoa, Volcano,Mountain View, Hawaii National Park, Kuritstown, Keaau, Hilo, Pahala, Papaikou and Pepeekeo. An M 4.5 aftershock was felt in a similar area later in the day. This activity occurred within about an hour of local solar midnight, a time when tidal stresses are maximized at full moon and was probably promoted by strong tidal effects. An M 4.3 hit the area on June 21 but the last of larger magnitude in Hawaii was an M 4.9 on November 11, 2019. Forecast 124988 had expected activity within about 15 km of this epicenter was likely at the end of June.

 

O:  4JUL2020 00:18:49  19.3N  155.1W mb=4.5  EMSC   ISLAND OF HAWAII, HAWAII     

O:  3JUL2020 09:20:01  19.3N  155.1W mb=4.7  EMSC   ISLAND OF HAWAII, HAWAII     

P: 25JUN2020 124988    19.2N  155.2W 3.0-4.4 CAAAA  Hawaii                      

 

Aftershocks of M 3.8 and 3.9-4.4 also shook the southern Idaho aftershocks zone today. NEIC reported they were felt with intensity II-III in southern Idaho at Stanley, Lowman, Ketchum, Boise, May. Earthquakes of M 4.6 and 4.7 hit that area of Idaho on June 25 and June 14, the last such aftershocks of M>=4.4 in the area of the M 6.5 of March 31, 2020. Forecasts 125372 had expected today's activity was likely within about 10 km  of these epicenters around July 6.

 

O: 03JUL2020 07:52:33  44.4N  115.2W Ml=2.0  EMSC   SOUTHERN IDAHO

O: 03JUL2020 08:05:31  44.4N  115.2W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 03JUL2020 13:50:29  44.4N  115.2W Ml=4.4  EMSC   SOUTHERN IDAHO

O: 03JUL2020 15:24:01  44.5N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O:  4JUL2020 02:57:22  44.3N  115.2W ML=3.3  EMSC   SOUTHERN IDAHO               

P:  6JUL2020 125372    44.5N  115.1W 2.0-3.9 AAAAA  Montana/Idaho              

 

A light M 2.1 was recorded in southwestern Maine today. It was not reported felt in this area. The last earthquake of M>=2.1 within about 100 km of this epicente occurred September 7, 2019 with M 2.3 and with M 2.1 on April 11, 2020. Forecast 125369 had expected this activity was likely around July 4. This event occurred near local solar midnight at a longitude of maximum tidal stress with the full moon and may have been promoted by tidal effects from that alignment.

 

O:  4JUL2020 06:23:27  44.2N   70.7W ML=2.1  EMSC   MAINE                        

P:  4JUL2020 125369    44.0N   70.0W 2.0-3.9 AAAAA  Maine                       

 

The largest earthquake of the past week in the world occurred today as an M 5.4 in the Solomon Islands. An M 5.6 was recorded in the Ascension Island area on June 29 but the last earthquake in the world of significantly larger magnitude was an M 6.3 on June 25, 2020 in southern China. The earthquake in China occurred near the area of maximum solar eclipse of June 21 and was probably promoted by that tidal alignment. Today's M 5.4 and 5.2 in the D'Entrecasteaux Islands south of the Solomon Islands occurred within minutes of local solar noon and was probably promoted by high tidal stresses which maximize at this hour. Forecast 125167 had expected seismicity to the west was likely around June 29. The last earthquake of M 5.4 or greater within about 200 km of this epicenter in  the D'Entrecasteaux Islands was an M 5.6 on November 17, 2014. An earthquake of M 6.1 hit the area about 300 km to the southwest of this on March 10, 2019, the only other such event in the area in the past five years.

 

O:  4JUL2020 01:34:44   9.7S  154.8E mb=5.4  EMSC   D'ENTRECASTEAUX ISLANDS REGION

O:  4JUL2020 01:49:58   9.8S  154.9E mb=5.2  EMSC   D'ENTRECASTEAUX ISLANDS REGION

P: 29JUN2020 125167    10.0S  151.0E 4.0-5.4 BACAA  New Ireland                

 

 

 

 

 

 

 

 

OCEAN RIDGES SHOW ENHANCED SEISMICITY

MODERATE EARTHQUAKES SHAKE CENTRAL MEXICO AND SOUTHERN KURIL ISLANDS, JAPAN

 

EARTHQUAKE SUMMARY FOR JULY 2, 2020

 

It was another quiet day in global seismicity. The strongest earthquake of the

day was an M 5.2 in the Kuril Islands of Japan. JMA reported it was lightly

felt in northern Japan. The only larger event within about 150 km  of this epicenter in the past year was an M  5.3 on October 14, 2019. An M 7.0 hit the area about 250 km to the northeast of this on February 13, 2020. Forecast 125089 had expected today's event within about 100 km of this epicenter was likely at the end of June, 2020. 

 

O:  2JUL2020 07:07:25  43.8N  147.9E mb=5.2  EMSC   KURIL ISLANDS                

P: 27JUN2020 125089    44.0N  147.0E 3.5-5.4 BAAAA  Hokkaido, Japan             

 

An M 5.2 also shook areas of Oaxaca, Mexico west of the aftershock zone of the M 7.5 event of June 23. Earthquakes of M 5.2-5.3 have previously hit this area within about 100 km of this epicenter on January 15,, 2020 and August 22, 2018 but the last of larger magnitude within this area was an M 5.7 on July 19, 2018. Forecasts 125280 and 125002 had expected this activity in late June or early July, 2020.

 

O:  2JUL2020 16:17:57  16.4N   97.8W ML=5.2  EMSC   OFFSHORE OAXACA, MEXICO      

P:  5JUL2020 125280    16.0N   96.0W 3.5-5.8 BAAAA  Oaxaca, Mexico             

P: 28JUN2020 125002    16.0N   96.0W 3.5-5.1 BAAAA  Oaxaca, Mexico             

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 south of Alaska in the Unimak, Alaska area. This earthquake was not reported felt in this remote area. The last earthquake within about 150 km of this epicenter with M>=4.6 occurred on June 9, 2020 also with M 4.6 and prior to that on May 9 with M 4.7. The last earthquake of larger magnitude in this area was an M 5.1 on February 15, 2019.  Forecast 125143 had expected today's event in this area was likely around June 30.

 

 

O:  2JUL2020 22:24:59  53.9N  161.2W mb=4.6  EMSC   SOUTH OF ALASKA              

P: 30JUN2020 125143    54.7N  161.2W 3.5-4.9 AAAAA  Unimak Islands, Aleutians  

 

EARTHQUAKE SUMMARY FOR JULY 1, 2020

 

A series of moderate earthquakes occurred along ocean ridges today in the greatest seismicity of the day. Most of these were M 4.6-5.1. They were not reported felt in these remote epicentral areas. These events occurred with M 5.1 in the Southern East Pacific Rise and in the Western Indian-Antarctic Ridge and in the Greenland Sea north of Norway with M 4.6 and 3.4.

 

The M 5.1 in the East Pacific Rise was the strongest within about 300 km of that epicenter since an M 5.5 on September 1, 2019. 

 

Forecast 125217 had expected area would be active at the end of June.

 

O:  2JUL2020 03:35:20  49.5S  115.5W Mw=5.1  EMSC   SOUTHERN EAST PACIFIC RISE   

 

The M 5.1 in the Western Indian-Antarctic Ridge south of Australia was the strongest within about 300 km of that epicenter since an M 5.1  on July 5, 2019 and prior to that an M 5.2 on November 6, 2017.

 

O:  2JUL2020 00:16:33  49.6S  126.2E Mw=5.1  EMSC   WESTERN INDIAN-ANTARCTIC RIDGE

P: 26JUN2020 125217    49.0S  122.0E 4.0-5.7 CACAA  So. of Australia           

 

The earthquake in the Greenland Sea is the largest within about 250 km of that epicenter in the past half year. An M 4.8 occurred near this epicenter on December 18, 2019 and  prior to that an  M 4.6 on June 21, 2019. Forecast 125159 had expected activity in this area at the end of June.

 

O:  2JUL2020 06:54:36  75.6N    7.8E Mn=4.6  EMSC   GREENLAND SEA                

O:  2JUL2020 06:52:45  75.8N    8.6E Mn=3.4  EMSC   GREENLAND SEA                

P: 30JUN2020 125159    74.0N   14.0E 3.0-4.6 ABAAA  Norway                     

 

O:  1JUL2020 22:42:53   7.3S   68.0E mb=4.9  EMSC   MID-INDIAN RIDGE             

P: 27JUN2020 124960     3.0S   68.0E 4.0-5.4 BCAAA  Indian Ocean                

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in the Alaska Peninsula. It was not reported felt in this remote area. The last earthquake in the Alaska Peninsula of M>=3.9 occurred on June 12, 2020 with M 4.4 but an M 4.6 hit west of this on June 9. The largest earthquake in the Alaska Peninsula in the past half year was an M 4.9 on February 17, 2020. Forecast 125143 had expected today's activity to the southwest around June 30.

 

O:  2JUL2020 09:59:12  55.9N  158.8W ml=3.9  EMSC   ALASKA PENINSULA             

P: 30JUN2020 125143    54.7N  161.2W 3.5-4.9 ABBAA  Unimak Islands, Aleutians  

 

QUIET SEISMIC PATTERN EXPECTED

 

EARTHQUAKE SUMMARY FOR JUNE 29, 2020

 

Seismicity around the world today was returning to the quiet pre-Kermadec levels. It is expected that this will be the pattern of seismicity for several weeks to come. While an occasional moderately large to large quake is likely, much of the available seismic energy was dissipated in the unusually active seismic triggering following the M 7.4 in the Kermadec Islands, the M 7.5 in Oaxaca, Mexico and the annular solar eclipse across southern Asia. Most of the areas which were likely to have seen enhanced seismicity from these events have now seen it as moderately large to large earthquakes. Further moderate seismicity is likely in these areas in coming days, and the possibility of a large quake in these regions cannot be precluded at this time. One area which is still quiet is at 144 degrees from Oaxaca - in central Indonesia, an active zone where a strong earthquake has not occurred with the current seismic enhancements.  The absence of strong ocean storms, geomagnetic disturbances and/or other triggering agents for seismic enhancement at this time suggests quiet upcoming conditions.

 

The strongest earthquakes in the world today were a pair of M 5.4 and 4.7 events in southeastern Honshu, Japan south of Tokyo. JMA reported they were felt lightly in the epicentral areas. These are unusual epicenters with the last event of M>=5.4 within about 100 km of them occurring  as an M 5.5 on December

24, 2018 but the last event of this size in the area between 33 and 34 North Latitude was an M 5.4 on December 18, 2009 more than 10 years ago. Forecast 125058 had expected this activity within about 25 km of the epicenters was likely around June 28. Like other recent moderately large quakes in Honshu, Japan this occurred at 105-106 degrees from the M 7.5 in Oaxaca, Mexico of June 23 and was probably promoted by energy from that source.

 

O: 29JUN2020 19:37:08  33.8N  141.9E mb=4.7  EMSC   OFF EAST COAST OF HONSHU, JAPA

O: 29JUN2020 09:52:49  33.9N  141.6E Mw=5.4  EMSC   OFF EAST COAST OF HONSHU, JAPA

P: 28JUN2020 125058    34.0N  142.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

An unusual earthquake of M 5.1 hit the Sabah area of Malaysia today. This epicenter is at 141 degrees from the Oaxaca, Mexico epicenter and may have been promoted from that source. An M 4.4 in Flores also occurred today at 143 degrees from Oaxaca. The last earthquake within about 300 km of the Sabah quake today with M>=5 was an M 5.2 on March 8, 2018. Today's event and the 2018 quake are probably aftershocks of an M 6.0 that hit nearby on June 4, 2015, more than five years ago. Forecasts 124945 and 124959 had expected regional seismic enhancement at the end of June.

 

O: 30JUN2020 01:58:30   6.9N  116.4E Mw=5.1  EMSC   SABAH, MALAYSIA               

P: 26JUN2020 124945     1.0N  123.0E 4.0-5.6 BCCAA  Mindanao, Philippines      

 

O: 30JUN2020 06:27:10   8.4S  121.4E Mw=4.9  EMSC   FLORES REGION, INDONESIA     

P: 29JUN2020 124959     7.0S  120.0E 4.0-5.4 ABBAA  Flores Island area          

 

The swarm of light earthquakes on the Texas-New Mexico border continued today for the third day. This summary noted these in the previous issue as:

 

"The series of earthquakes in New Mexico near the Texas border also continued at an active level today including 10 minor quakes in the past day. This series of light earthquakes has been felt in the past two days in New Mexico and western Texas. The largest today was an M 3.1. NEIC reported this earthquake of M 3.1 in New Mexico  was felt with intensity II-III in the area(s) of Midland, Texas.  Forecast 125060 had expected this activity to the south was likely around  June 23." (June 28-29, 2020)

 

These events are located at the maximum longitude of tidal stresses with the past new moon (103 degrees) and may have been promoted by tidal stresses.

 

O: 29JUN2020 10:04:51  32.8N  103.4W mb=2.7  EMSC   NEW MEXICO

O: 29JUN2020 15:19:37  32.8N  103.5W ML=3.1  EMSC   NEW MEXICO

O: 30JUN2020 02:14:38  32.8N  103.5W ML=2.6  EMSC   NEW MEXICO

O: 29JUN2020 09:07:57  32.8N  103.5W mb=2.5  EMSC   NEW MEXICO                   

P: 23JUN2020 125060    31.4N  103.8W 2.0-4.0 CBAAA  SW U.S.A                   

 

A moderately strong earthquake of M 5.6 also occurred in the South Mid-Atlantic Ridge near Ascension Island today. The last earthquake within about 250 km of this epicenter in the Ascension Island area was an M 5.9 on January 27, 2020. Forecast 125171 had expected today's activity about 250 km south of today's epicenter was likely around June 25.

 

O: 29JUN2020 19:40:12  11.7S   13.4W Mw=5.6  EMSC   ASCENSION ISLAND REGION      

P: 25JUN2020 125171    14.0S   14.0W 4.0-5.6 BCAAA  So. Mid-Atlantic Ridge     

 

ACTIVE CONDITIONS CONTINUE IN GREECE AND TURKEY

 

EARTHQUAKE SUMMARY FOR JUNE 28, 2020

 

Active seismicity continued today in the region of Greece and Turkey which has

been at enhanced seismicity levels over the past three days following the M 7.5 in Oaxaca, Mexico at 103-105 degrees distance on June 23, 2020. The strongest earthquake in the world today was an M 5.5 in the Dodecanese Islands, near the Greek-Turkish border.  The mainshock of M 5.5 was reported felt with maximum intensity VI in Koycegiz, Mugla, Turkey and V in Dalaman, Marmara, Turkey and Pastida, Rodos, Paradision, Greece with lesser shaking within about 100 km of the epicenter. An M 4.8 aftershock was reported felt with maximum intensity IV in Rodos. Greece and Nurdagi, Turkey and II-III in Marmara, Dalaman, Turkey and in Greece in the Dodecanese Islands at Kos, Simi, Mugla.  Like earthquakes in Crete, Greece and western Turkey of the past several days, this epicenter is located at 105 degrees from the M 7.5 in Oaxaca, Mexico of June 23 and

was probably promoted by concentrated energy from that source. The last earthquake in the Dodecanese Islands of Greece within about 150 km of the M 5.5 today occurred as an M 5.8 nearly a year ago on August 8, 2019 and prior to that an M 5.7 on March 20, 2019. Forecast 125076 had expected today's events were likely about 150 km northeast of today's epicenter most likely around June 28.

 

O: 29JUN2020 04:06:24  36.7N   28.2E mb=4.7  EMSC   DODECANESE IS.-TURKEY BORDER R

O: 28JUN2020 17:43:29  36.7N   28.3E Mw=5.5  EMSC   DODECANESE IS.-TURKEY BORDER R

P: 28JUN2020 125076    38.0N   29.0E 3.5-5.1 ABAAA  Turkey                     

 

Earthquakes also continued in Crete today. The largest of these was an M 4.4 in Crete which was lightly felt in the epicentral area. These had been expected around June 25-29 in Crete and the Aegean Sea within this epicentral area. They appear to be aftershocks of the M 4.8 on June 26, 2020. When the event occurred in Crete on June this summary noted in this regard:

 

 

"A series of moderate earthquakes also occurred in the area of Crete, Greece today. The M 4.8 in Crete was reported by NEIC with maximum intensity V in Karpathos, Dodecanese Islands, Greece. These are located at 105 degrees from the epicenter of the Oaxaca, Mexico earthquake of M 7.7 on June 23  and were probably promoted by energy from that event as expected in previous issues of this summary:

 

 

"Far-field triggering is likely with this earthquake. Areas near 144 degrees include Minahasa, Indonesia where an M 5.9-6.1 occurred earlier today; India, Myanmar, Mayotte. The antipode at 16S 84E is in the Indian Ocean and is not seismic. Areas at 103 degrees from the Oaxaca epicenter include the east coast of Honshu, Japan and Guam as well as western Turkey and Greece and New Zealand from Cook Strait through South Island; the Vanuatu Islands. The fourth node at 90 degrees is prominent in the area south of the Kermadec Islands, the Kuril Islands, the French-Swiss Alps where an M 3.8 occurred earlier in the day.  A lack of moderate seismicity in the region of Honshu, Japan today is unsettling and may suggest a seismic quiescence following the Mexico M 7.4, a quiet which is likely to be broken soon." (June 23-24, 27, 2020)

 

O: 28JUN2020 23:45:24  35.5N   26.7E ML=3.2  EMSC   CRETE, GREECE

O: 28JUN2020 13:42:14  35.5N   26.7E ML=3.3  EMSC   CRETE, GREECE

O: 28JUN2020 11:18:35  35.5N   26.7E mb=4.4  EMSC   CRETE, GREECE                

P: 25JUN2020 125045    34.0N   27.0E 3.0-4.6 BBAAA  Crete                      

P: 29JUN2020 125027    36.0N   24.0E 3.0-4.8 AABAA  Aegean Sea                 

 

Other activity near 103 degrees from Oaxaca, Mexico continued in southeastern Honshu, Japan (M 4.7).

 

Moderate aftershocks also continued today in the region of Southern Puerto Rico. The strongest today was an M 4.6 and M 4.2. NEIC reported it was felt with maximum intensity V in Puerto Rico at Guanica, Guayanilla, San German and Ponce with IV in Lajas, Sabana Grande, Yauco, Cabo Rojo, Penuelas and Hormigueros. These followed earthquakes of M 4.7 and 4.9 in the area yesterday. This summary had noted these in the previous issue as:

 

 

"A series of moderate earthquakes in the north Atlantic Ocean today culminated with a pair of strongly felt earthquakes in southern Puerto Rico. This pair of moderate earthquakes of M 4.7 and 4.9 shook the southern Puerto Rico aftershock zone near Ponce today. NEIC reported these were felt with maximum intensity V in Puerto Rico at Ensenada, Guanica, Sabana Grande, Guayanilla, San German  and Ponce and IV in Lajas, Yauco, Cabo Rojo, Penuelas and Hormigueros. The M 4.9 is the strongest aftershock in southern Puerto Rico in the vicinity of The M 6.5 of January 7, 2020 since an M 5.4 on May 2, 2020 and an M 5.0 on  February 4, 2020. Forecast 125004 had expected today's activity was likely around June 27." (June 27-28, 2020)

 

O: 28JUN2020 23:12:46  17.8N   67.0W ML=4.0  EMSC   PUERTO RICO REGION

O: 28JUN2020 18:19:14  17.9N   66.8W Md=3.0  EMSC   PUERTO RICO REGION

O: 28JUN2020 07:15:17  17.9N   66.9W ML=3.0  EMSC   PUERTO RICO REGION

O: 29JUN2020 03:56:39  17.9N   66.9W ML=3.2  EMSC   PUERTO RICO REGION

O: 28JUN2020 11:52:35  17.9N   66.9W ML=3.5  EMSC   PUERTO RICO REGION

O: 28JUN2020 11:49:22  17.9N   66.9W ML=3.6  EMSC   PUERTO RICO REGION

O: 28JUN2020 07:56:44  17.9N   66.9W Md=3.1  EMSC   PUERTO RICO

O: 28JUN2020 22:34:16  17.9N   67.0W ML=3.0  EMSC   PUERTO RICO REGION

O: 28JUN2020 21:43:57  17.9N   67.0W Mw=3.9  EMSC   PUERTO RICO REGION

O: 28JUN2020 06:54:23  18.0N   66.9W ML=3.0  EMSC   PUERTO RICO

O: 28JUN2020 07:58:53  18.0N   66.9W ML=3.5  EMSC   PUERTO RICO

O: 28JUN2020 11:54:21  18.0N   66.9W ML=3.7  EMSC   PUERTO RICO

O: 28JUN2020 22:48:48  18.0N   66.9W Mw=4.4  EMSC   PUERTO RICO

O: 28JUN2020 08:15:55  18.0N   67.0W ML=3.1  EMSC   PUERTO RICO

O: 28JUN2020 22:10:45  17.8N   66.9W ML=3.5  EMSC   PUERTO RICO REGION           

P: 27JUN2020 125004    18.0N   66.0W 3.4-5.2 AAAAA  Puerto Rico                

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in the Fox Islands, Aleutians, Alaska. NEIC reported this earthquake of M 3.7 in  the Fox Islands, Alaska was felt with intensity II-III in the area(s) of Unalaska, Alaska. This area has been active in June with an M 4.8 on June 13 and an M 4.5 on June 15. The last event of M>=3.7 in the Fox Islands within about 150 km of today's epicenter occurred June 19, 2020 with M 3.7. Forecast 125128 had expected today's event was likely within about 50 km of this epicenter around June 29.

 

O: 29JUN2020 02:02:36  53.8N  166.8W mb=3.7  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 29JUN2020 125128    53.6N  166.1W 3.5-4.9 AAAAA  Fox Islands, Aleutians     

 

The series of earthquakes in New Mexico near the Texas border also continued at an active level today including 10 minor quakes in the past day. This series of light earthquakes has been felt in the past two days in New Mexico and western Texas. The largest today was an M 3.1. NEIC reported this earthquake of M 3.1 in New Mexico  was felt with intensity II-III in the area(s) of Midland, Texas.  Forecast 125060 had expected this activity to the south was likely around  June 23.

 

O: 28JUN2020 14:05:40  32.8N  103.5W ML=2.5  EMSC   NEW MEXICO

O: 28JUN2020 17:09:25  32.8N  103.5W ML=3.1  EMSC   NEW MEXICO

O: 28JUN2020 09:30:32  32.8N  103.5W mb=2.4  EMSC   NEW MEXICO

O: 28JUN2020 10:10:41  32.8N  103.5W mb=2.5  EMSC   NEW MEXICO

O: 28JUN2020 08:14:44  32.8N  103.5W mb=2.6  EMSC   NEW MEXICO

O: 28JUN2020 08:19:06  32.8N  103.5W mb=2.6  EMSC   NEW MEXICO

O: 28JUN2020 12:51:49  32.8N  103.5W mb=2.6  EMSC   NEW MEXICO

O: 28JUN2020 07:26:43  32.8N  103.5W mb=2.8  EMSC   NEW MEXICO

O: 28JUN2020 11:13:14  32.7N  103.4W mb=2.7  EMSC   NEW MEXICO                   

P: 23JUN2020 125060    31.4N  103.8W 2.0-4.0 BBAAA  SW U.S.A                   

 

NORTH ATLANTIC SEES ENHANCED SEISMICITY;  QUAKES IN SOUTHERN PUERTO RICO

 

EARTHQUAKE SUMMARY FOR JUNE 27, 2020

 

A series of moderate earthquakes in the North Atlantic Ocean today culminated with a pair of strongly felt earthquakes in southern Puerto Rico. This pair of moderate earthquakes of M 4.7 and 4.9 shook the southern Puerto Rico aftershock zone near Ponce today. NEIC reported these were felt with maximum intensity V in Puerto Rico at Ensenada, Guanica, Sabana Grande, Guayanilla, San German  and Ponce and IV in Lajas, Yauco, Cabo Rojo, Penuelas and Hormigueros.  The M 4.9 is the strongest aftershock in southern Puerto Rico in the vicinity of The M 6.5 of January 7, 2020 since an M 5.4 on May 2, 2020 and an M 5.0 on  February 4, 2020. Forecast 125004 had expected today's activity was likely around June 27.

 

O: 28JUN2020 07:15:17  17.9N   66.9W ML=3.0  EMSC   PUERTO RICO REGION

O: 28JUN2020 06:45:05  17.9N   66.9W mb=4.7  EMSC   PUERTO RICO REGION

O: 27JUN2020 14:04:05  18.0N   66.8W Md=3.0  EMSC   PUERTO RICO REGION

O: 28JUN2020 06:54:23  18.0N   66.9W ML=3.0  EMSC   PUERTO RICO

O: 28JUN2020 07:58:53  18.0N   66.9W ML=3.5  EMSC   PUERTO RICO

O: 28JUN2020 07:30:39  18.0N   66.9W ML=3.6  EMSC   PUERTO RICO

O: 28JUN2020 06:42:41  17.8N   66.9W Mw=4.9  EMSC   PUERTO RICO REGION           

P: 27JUN2020 125004    18.0N   66.0W 3.4-5.2 AAAAA  Puerto Rico                

 

The moderate earthquakes in the North Atlantic today included at least four of M 4.3-4.5. These occurred off the west coast of Portugal (M 4.4); north of this in the Cape St. Vincent Ridge (M 4.3); about 200 km north of these with M 4.4 and in the North Atlantic west of France with M 4.5. These are generally antipodal to recent strong activity in New Zealand - especially the M 6.0 in South Island two days ago and the M 4.5 today in the North Atlantic. The series is reminiscent of a similar series in the area of that followed an unusual M 4.9 off the west coast of North Island on June 13 and was noted in this summary at the time:

 

"The earthquake in South Island, New Zealand today was accompanied by an unusual earthquake west of North Island, New Zealand of M 4.7. The epicenter of this event is quite unusual. No earthquakes of M>=4.0 have occurred in this region northwest of New Zealand within about 300 km in at least 30 years. The only events within this area on record of M>=4.7 occurred on December 28, 1976 and December 26, 1946 (both M 5.4) and on January 27, 1945 (M 5.1). An M 7.1 hit in the Loyalty Islands on February 1, 1945; an M 6.5 in the Kermadec Islands on December 30, 1946.  A series of great earthquakes in Central Honshu and the Kuril Islands of M 7.9 and 8.4 occurred on December 20 and 21, 1946 and may have helped trigger the New Zealand event of December 26, 1946. And an M 6.3 in northern Chile on December 28, 1976 but none were associated with a subsequent major or great earthquake in the several days following." (June 13, 2020)

 

and

 

 

"Near the antipode of the event west of North Island an M 4.9 occurred later in the day off the west coast of Spain. This is within about 300 km of the exact antipode of the New Zealand event (39N 13W). The combination of these unusual near-antipodal quake suggests something may be brewing in global seismicity. Today's earthquake off Spain is the largest within about 250 km of that epicenter since an M 5.5 on December 17, 2009 more than 10 year ago.  Forecast 124784 had expected today's event was likely within about 100 km of this epicenter around June 13. After the event in New Zealand and an M 5.1 in Tonga, this is the third largest event in the world today. There is no history of unusual major global events following the rare events of M>=4.9 in this region off Spain in the past 30 years. Antipodal earthquake pairs, especially those at rare epicenters, can precede changes in  global seismicity but how that might play out in this case is uncertain." (June 13, 2020)

 

Forecasts 125050 had expected today's activity off the coast of Spain was  likely around June 27. Forecast 124996 had expected the event in the Northern  Mid-Atlantic Ridge around June 30 as reported in earlier issues of this summary as below. Much of this activity in the North Atlantic is at the fifth node (72 degrees) from the M 7.5 in Oaxaca, Mexico of June 23 and may have been promoted by energy from that source.

 

"On the first day of summer in the northern hemisphere, the sun reaches its zenith at about 23 degree North latitude due to the tilt of the earth's axis. ...  The only seismic areas at this latitude in the western hemisphere are in the Gulf California and the north mid-Atlantic Ridge. (June 22, 2020)

 

O: 28JUN2020 07:32:57  17.6N   46.5W ML=4.6  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 30JUN2020 124996    17.0N   47.0W 4.0-5.4 AAAAA  Mid-Atlantic Ridge         

 

O: 27JUN2020 17:32:17  32.9N   12.3W mb=4.4  EMSC   MADEIRA ISLANDS, PORTUGAL REGI

O: 28JUN2020 07:21:58  35.1N   14.7W mb=4.3  EMSC   AZORES-CAPE ST. VINCENT RIDGE

P: 27JUN2020 125050    37.0N   11.0W 3.5-5.2 ABBAA  Morocco/Spain              

 

O: 27JUN2020 20:18:54  36.7N   11.2W ML=2.7  EMSC   AZORES-CAPE ST. VINCENT RIDGE

O: 27JUN2020 14:14:59  37.3N   12.7W mb=4.4  EMSC   AZORES-CAPE ST. VINCENT RIDGE

P: 27JUN2020 125050    37.0N   11.0W 3.5-5.2 AAAAA  Morocco/Spain              

 

O: 27JUN2020 10:59:25  47.5N    5.4W ML=4.5  EMSC   NORTH ATLANTIC OCEAN         

 

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in the Rat Islands, Aleutians, Alaska. This is the strongest earthquake in the Rat Islands in two months - since an M 4.1 on April 26, 2020. It was not reported felt in this remote area. Forecast 125136 had expected this event within about 100 km was likely around June 21.

 

O: 27JUN2020 21:35:55  51.6N  178.0E mb=3.9  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 21JUN2020 125136    51.0N  179.0E 4.0-5.8 CAAAA  Rat Islands                

 

FAR-FIELD TRIGGERING CONTINUES FOLLOWING OAXACA, MEXICO M 7.5-7.7

 

EARTHQUAKE SUMMARY FOR JUNE 26, 2020

 

Seismicity at 103 degrees from the M 7.7 in Oaxaca, Mexico of June 23, 2020 continued today. Several moderate earthquakes were felt in western Turkey and Crete, Greece. The M 4.8 in Crete was reported by NEIC with maximum intensity V in Karpathos, Dodecanese Islands, Greece. Moderate quakes at 103 degrees from Oaxaca also shook areas near Tokyo, Japan (M 4.5); and South Island, New Zealand today (M 4.1, 4.1).

 

The largest earthquake recorded today was an M 5.4 in northern Philippines at the eastern terminix of the solar eclipse of June 21, 2020. NEIC reported it was felt with maximum intensity IV in Vintar, Ilocos and III in Laoag and Aparri Cagayan Valley and Balibago, Central Luzon, Philippines. A series of moderate earthquakes also continued to the west along the path of the solar eclipse of June 21. The events in Taiwan and the northern Philippines had been an expected consequence of the eclipse as noted in previous issues of this report. The M 5.4 today was the largest in the area of the northern Philippines in more than a year - since a similar M 5.4 on May 12, 2019. The last event of significantly larger magnitude in the area was an M 5.8 on February 17, 2014. Forecast 124765 had expected a moderate quake in the area was likely in mid-June.

 

O: 26JUN2020 11:54:57  19.1N  121.1E Mw=5.4  EMSC   BABUYAN ISL REGION, PHILIPPINE

P: 16JUN2020 124765    20.0N  121.0E 4.0-5.4 CAAAA  Taiwan                      

 

 

A moderately strong earthquake of M 5.6 (later downgraded to M 5.2) hit Western Turkey today and was widely felt. EMSC reported intensities up to V in Turkey at Ahmetli, Akhisar, Manisa, Salihli, Muradiye, Kemalpasa, Soma, and other areas within about 300 km of the epicenter. NEIC reported intensity VII in Manisa, Turkey at Golmarmara; V in Foca, Izmir, IV in Manisa, Izmir, Tire, Balikesir, and II-III in Torbali, Aydin, Milas, Mugla and Bursa, Turkey. This event is at 103-104 degrees from the epicenter in Oaxaca, Mexico and is the third moderately strong to strong event at that distance from Oaxaca in the two days following that M 7.7 event - including events of M 6.0 and 6.2 in South Island, New Zealand an Southeastern Honshu, Japan yesterday. The last event within about 200 km of this epicenter with M>=5.2 was recorded as occurring on January 22, 2020  with M 5.6 and September 26, 2019 in the Istanbul, Turkey area with M 5.7. Forecast 125076 had expected today's event within this area was likely around June 28.

 

O: 25JUN2020 21:50:32  39.0N   27.8E ML=2.5  EMSC   WESTERN TURKEY

O: 26JUN2020 07:21:11  38.7N   27.8E mb=5.6  EMSC   WESTERN TURKEY               

O: 26JUN2020 07:21:11  38.7N   27.8E mb=5.2  ANSS   WESTERN TURKEY               

P: 28JUN2020 125076    38.0N   29.0E 3.5-5.1 AAAAA  Turkey                     

 

A series of moderate earthquakes also occurred in the area of Crete, Greece today. The M 4.8 in Crete was reported by NEIC with maximum intensity V in Karpathos, Dodecanese Islands, Greece. These are located at 105 degrees from the epicenter of the Oaxaca, Mexico earthquake of M 7.7 on June 23  and were probably promoted by energy from that event as expected in previous issues of this summary:

 

 

 

"Far-field triggering is likely with this earthquake. Areas near 144 degrees include Minahasa, Indonesia where an M 5.9-6.1 occurred earlier today; India, Myanmar, Mayotte. The antipode at 16S 84E is in the Indian Ocean and is not seismic. Areas at 103 degrees from the Oaxaca epicenter include the east coast of Honshu, Japan and Guam as well as western Turkey and Greece and New Zealand from Cook Strait through South Island; the Vanuatu Islands. The fourth node at 90 degrees is prominent in the area south of the Kermadec Islands, the Kuril Islands, the French-Swiss Alps where an M 3.8 occurred earlier in the day.  A lack of moderate seismicity in the region of Honshu, Japan today is unsettling and may suggest a seismic quiescence following the Mexico M 7.4, a quiet which is likely to be broken soon." (June 23-24, 2020)

 

A strong M6.6 hit the region of Crete about 200 km southwest of this on May 2 but the last event in Crete within about 100 km of today's epicenter was an  M 4.8  on February 14, 2020 - the last of larger magnitude in this area was an M 5.4 on December 10, 2019. Forecast 125045 had expected today's activity was likely around June 25.

 

O: 26JUN2020 12:56:01  35.4N   26.7E ML=4.0  EMSC   CRETE, GREECE

O: 26JUN2020 18:49:19  35.5N   26.7E ML=2.6  EMSC   CRETE, GREECE

O: 27JUN2020 00:58:39  35.5N   26.7E ML=3.0  EMSC   CRETE, GREECE

O: 26JUN2020 20:40:56  35.5N   26.7E ML=3.5  EMSC   CRETE, GREECE

O: 26JUN2020 15:14:58  35.5N   26.7E ML=3.7  EMSC   CRETE, GREECE

O: 26JUN2020 22:15:15  35.5N   26.7E ML=3.7  EMSC   CRETE, GREECE

O: 26JUN2020 23:44:07  35.5N   26.7E ML=3.7  EMSC   CRETE, GREECE

O: 26JUN2020 23:10:29  35.6N   26.7E ML=3.6  EMSC   CRETE, GREECE

O: 26JUN2020 22:08:08  35.6N   26.7E ML=3.7  EMSC   CRETE, GREECE

O: 26JUN2020 19:36:36  35.4N   26.6E Mw=4.8  EMSC   CRETE, GREECE                 

P: 25JUN2020 125045    34.0N   27.0E 3.0-4.6 ABAAA  Crete                      

 

The largest earthquake in the U.S. or Canada today was an M 4.2 in the still-active aftershock zone in southern Idaho. It was accompanied by a series of light aftershocks. These may be related to the M 4.6 in Idaho of June 25 (yesterday) This summary had noted in the previous issue in this regard:

 

 

"A moderate earthquake of M 4.6 also hit the southern Idaho aftershock zone today. NEIC reported it was felt with maximum intensity IV in Idaho at Lowman; III in Stanley, Cascade, McCall, Idaho City, Ketchum, Horseshoe Bend and Ola and II in Garden Valley, Atlanta. It was reported as far as Utah and Oregon.

This is the strongest aftershock to date of the M 6.5 mainshock of March 31, 2020 in Southern Idaho. In the past 30 years only two other events have reached this magnitude in southern Idaho - both of M 4.6-4.7 on November 10, 1993 and January 28, 1995. Forecast 125100 had expected enhanced seismicity in the area was likely around June 23. It was probably promoted by energy from the M 7.5-7.7 in Oaxaca, Mexico yesterday. It is at the exact 11th node (32.7 degrees) from the Mexican mainshock." (June 25-26, 2020)

 

Forecast 125100 had expected today's activity in this aftershock zone around June 28.

 

NEIC reported this earthquake of M 3.7-4.2 in Southern Idaho  was felt with intensity II-III in the area(s) of Southern Idaho at Lowman, Stanley, Boise, Emmett and Caldwell.

 

O: 27JUN2020 00:35:57  44.1N  115.1W Ml=4.2  EMSC   SOUTHERN IDAHO

O: 26JUN2020 21:09:43  44.2N  115.0W ML=2.3  EMSC   SOUTHERN IDAHO

O: 26JUN2020 13:01:35  44.2N  115.0W Ml=2.3  EMSC   SOUTHERN IDAHO

O: 26JUN2020 14:20:23  44.3N  115.2W ML=2.8  EMSC   SOUTHERN IDAHO

O: 26JUN2020 13:44:06  44.3N  115.3W Ml=2.4  EMSC   SOUTHERN IDAHO

O: 26JUN2020 08:01:27  44.4N  115.2W Ml=2.3  EMSC   SOUTHERN IDAHO

O: 26JUN2020 07:33:54  44.4N  115.2W Ml=3.1  EMSC   SOUTHERN IDAHO

O: 26JUN2020 11:33:08  44.4N  115.2W Ml=3.1  EMSC   SOUTHERN IDAHO

O: 27JUN2020 00:34:47  44.1N  115.1W ML=3.7  EMSC   SOUTHERN IDAHO               

P: 28JUN2020 125100    44.6N  115.0W 2.0-4.1 AAAAA  Montana/Idaho              

 

An unusual earthquake of M 4.9 shook areas near Lake Taupo, North Island, New Zealand today. GEONET reported this earthquake was felt with moderate intensity northeast of Okahune and in southwestern North Island and northern South Island. Light to moderate intensity was reported throughout much of southern and western North Island and northern South Island. More than 2284 people reported feeling this earthquake with 1722 reports of weak intensity; 531 of light intensity; 29 with moderate intensity; 0 with strong intensity; and 0 of severe intensity and 2 of extreme shaking. NEIC reported this earthquake of M 4.9 in North Island, New Zealand  was felt with intensity II-III in the area(s) of North Island, New Zealand at Taupo, Rotorua, Tauranga, Cambridge, Whakatane, Napier, Hastings, Gisborne, Palmerston North and Kapiti. This is a somewhat unusual earthquake - the last in this hydrothermal area of M>=4.9 occurred on September 4, 2019 with M 5.0 and prior to that as an M 5.0 on September 23, 2015. It may be related to energy from Oaxaca, Mexico as it occurred at about 99 degrees from that epicenter. Forecast 125206 had expected a moderate event in the Taupo are was likely within about 50 km of this epicenter around June 22.

 

O: 26JUN2020 20:41:32  38.5S  176.2E mb=4.9  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 26JUN2020 20:41:34  38.4S  176.2E ML=4.9  GEONET Felt with moderate intensity

P: 22JUN2020 125206    38.0S  176.0E 3.0-4.6 BAAAA  North Island, N.Z.         

 

STRO

STRONG EARTHQUAKE IN SOUTHERN CHINA PROMOTED BY SOLAR ECLIPSE

 

 

 

RTHQUAKE SUMMARY FOR JUNE 1, 2020

 

A strong M 6.4 earthquake hit the region near the border of Xinjiang and Xizang China today. There were no immediate reports of damages or casualties. But the quake was a shallow focus event and local damage is likely. This epicenter is slightly north of the maximum annular solar eclipse of June 21, 2020 as noted in previous issues of this report. A moderately strong M 5.6 also shook area of western Turkey early on June 26 with an epicenter at 103-104 degrees from the M 7.7 in Oaxaca, Mexico two days ago. The event in China is also near the exact opposite longitude (83 East) of the M 7.7 in Oaxaca, Mexico (96 West) which was at the exact opposite longitude of the maximum eclipse two days before. Solid earth tidal forces are  maximized at the longitude of the maximum eclipse as well as at the opposite longitude on the earth and probably led to both the earthquake in Oaxaca, Mexico and today's event in Xinjinag and Xizang, Chile. The maximum solar eclipse occurred at 32N 80E - today's earthquake was at 35N 82E. This report had expected a strong earthquake in southern China at this time as:

 

 

"Some enhanced activity in northern India and Myanmar is anticipated with the new moon today but the strongest of this may be delayed as noted in the tidal seismic forecast with today's solar eclipse:

 

and

 

 

"The new moon arrived June 21 at 06:41 UT. This involved an annular solar eclipse visible in the areas of Central Africa, Southern Asia, China and the Pacific with maximum at 06:41 UT. Maximum eclipse occurs over northern India, Nepal, Hindu Kush and Pakistan, an area which has seen enhanced seismicity in recent days including some unusual events at Gujarat, India and others. The eclipse will pass over Taiwan and the southern Ryukyu Islands as well as southern Iran and Pakistan and southern China. Most of these areas will probably see enhanced seismicity with this eclipse with a moderate chance of a major earthquake within a week of the eclipse in southern Asia. Longitudes which are sub-solar at this time are near 77 East and 103 West. These include areas of central Asia including Hindu Kush, India and Tajikistan in the east and the central and western U.S. and western Mexico in the west. These will experience the maximum tidal stresses and are most likely to see tidally triggered seismicity at this time. Many areas, especially those where fluids are important modulators of seismicity, can experience tidal enhancement of seismicity, and several large earthquakes are likely in the next eight days. Tidal triggering often occurs near local solar midnight and noon when alignment is most linear." (June 18-24, 2020)

 

"There have been reports and video of strange animal behavior in several areas of China. Local lore is that such behavior often preceded major earthquakes. Many of these odd occurrences include fish jumping out of water in Yunnan and other areas of southern China where the eclipse was visible on June 21. These observations appear to have been located in time near the time of the M 7.4 in the Kermadec Islands, New Zealand of June 18 and ground motions near 103 degrees in China at that time may have affected the fish. Literature over decades has documented odd animal behavior prior to major earthquakes, so this is an observation worth noting especially with the enhanced global seismicity of the past week and the eclipse. The largest earthquake along the path of the total eclipse of June 21 today occurred in Southern Sichuan, China in the neighborhood of these unusual animal behavior. This area is subject to major earthquakes. Recent extensive flooding in the area may also contribute to the possibiliy of a strong regional earthquake in the near term." (June 23-24, 2020)

 

 

Far-field expected seismicity following the Kermadec Islands had been expected at:

 

"Areas near 103 and 144 degrees from the M 7.4 south of the Kermadec Islands of June 18 which are seismic are few, so far-field triggering from that event may be limited. Among the most likely to see significantly enhanced seismicity in the next week are Iceland and eastern Turkey at 144 degrees and the central U.S. including Oklahoma, Missouri, Wyoming, Montana, northern Alaska, areas near western Cuba, Colombia, the South Mid-Atlantic and Bangladesh, India, Myanmar and southern China near 103 degrees from the Kermadec event. Southern Spain and Morocco are near the antipode of the Kermadec Islands. One or more of these areas is likely to see a significant earthquake, especially with the new moon." (June 20, 2020)

 

A foreshock of M 4.7 preceded the event in China about half an hour before the mainshock.

 

Far-Field triggering following Oaxaca, Mexico was expected as:

 

"Far-field triggering is likely with this earthquake. Areas near 144 degrees include Minahasa, Indonesia where an M 5.9-6.1 occurred earlier today; India, Myanmar, Mayotte. The antipode at 16S 84E is in the Indian Ocean and is not seismic. Areas at 103 degrees from the Oaxaca epicenter include the east coast of Honshu, Japan and Guam as well as western Turkey and Greece and New Zealand from Cook Strait through South Island; the Vanuatu Islands. The fourth node at 90 degrees is prominent in the area south of the Kermadec Islands, the Kuril Islands, the French-Swiss Alps where an M 3.8 occurred earlier in the day.  A lack of moderate seismicity in the region of Honshu, Japan today is unsettling and may suggest a seismic quiescence following the Mexico M 7.4, a quiet which is likely to be broken soon." (June 23-24, 2020)

 

At M 6.3-6.4 this is the strongest earthquake on the Xinjiang-Xizang border of

China within about 250 km since an M 6.9 near today's epicenter more than 6 years ago on February 12, 2014.  These may be aftershocks of an M 7.1-7.2 that shook the area on Mar 20, 2008. The only other such event in the area in the past 30 years was an M 6.3 on August 12, 2012. Forecasts 125081 and 125082 had expected regional seismic enhanced in Xizang around June 23-25 in connection with the solar eclipse.

 

O: 25JUN2020 20:29:39  35.6N   82.4E mb=4.7  EMSC   XINJIANG-XIZANG BORDER REGION

O: 26JUN2020 01:30:58  35.6N   82.4E mb=4.7  EMSC   XINJIANG-XIZANG BORDER REGION

O: 25JUN2020 21:05:18  35.6N   82.5E Mw=6.3  EMSC   XINJIANG-XIZANG BORDER REGION

O: 25JUN2020 21:05:18  35.6N   82.4E Mw=6.4  ANSS   XINJIANG-XIZANG BORDER REGION

O: 25JUN2020 21:05:18  35.6N   82.5E Mw=6.4  CENC   XINJIANG-XIZANG BORDER REGION

O: 25JUN2020 21:17:04  35.7N   82.4E mb=5.0  EMSC   XINJIANG-XIZANG BORDER REGION

O: 25JUN2020 23:07:53  35.7N   82.5E mb=4.3  EMSC   XINJIANG-XIZANG BORDER REGION

O: 25JUN2020 22:51:45  35.6N   82.4E mb=4.3  EMSC   XINJIANG-XIZANG BORDER REGION

P: 23JUN2020 125081    30.0N   82.0E 3.8-5.4 ACAAA  Xizang                     

P: 25JUN2020 125082    34.0N   89.0E 3.8-5.3 ABCAA  Xizang                     

 

A moderately strong earthquake of M 5.6 (later downgraded to M 5.2) hit Western Turkey today and was widely felt. EMSC reported intensities up to V in Turkey at Ahmetli, Akhisar, Manisa, Salihli, Muradiye, Kemalpasa, Soma, and other areas within about 300 km of the epicenter. NEIC reported intensity IV in Izmir, Turkey. This event is at 103-104 degrees from the epicenter in Oaxaca, Mexico and is the third moderately strong to strong event at that distance from Oaxaca in the two days following that M 7.7 event - including events of M 6.0 and 6.2 in South Island, New Zealand an Southeastern Honshu, Japan yesterday. The last event within about 200 km of this epicenter with M>=5.2 was recorded as occurring on January 22, 2020 with M 5.6 and September 26, 2019 in the Istanbul, Turkey area with M 5.7. Forecast 125076 had expected today's event within this area was likely around June 28.

 

O: 25JUN2020 21:50:32  39.0N   27.8E ML=2.5  EMSC   WESTERN TURKEY

O: 26JUN2020 07:21:11  38.7N   27.8E mb=5.6  EMSC   WESTERN TURKEY               

O: 26JUN2020 07:21:11  38.7N   27.8E mb=5.2  ANSS   WESTERN TURKEY               

P: 28JUN2020 125076    38.0N   29.0E 3.5-5.1 AAAAA  Turkey                     

 

An earthquake of M 5.4 was also located in eastern Turkey today. EMSC reported it was felt with intensity up to IV in Turkey at Van, Ipekyolu, Edremit, Hakkari and in Itan at Khowy, Khvoy, Salmas, and other communities within about 200 km of the epicenter. NEIC reported intensity V in Turkey at Van and in Orumiyeh, Iran and II-III in Tebriz, Iran and in Kurtalan and Erzurum, Turkey. The last earthquake within about 200 km of this epicenter in eastern Turkey with M>=5.4 was an M 6.0 on February 23, 2020. This appears to be an aftershock of the February event. Forecast 125085 had expected today's activity in this area was likely around June 23.

 

O: 25JUN2020 10:03:29  38.5N   44.1E Mw=5.4  EMSC   TURKEY-IRAN BORDER REGION    

P: 23JUN2020 125085    40.0N   44.0E 3.5-5.0 ABAAA  Caucasus/Caspian Sea       

 

An unusual shallow focus earthquake of M 4.5 was located in Romania today. EMSC reported it was felt with moderate intensity in Romania at Orsova, Baile Herculane, Gura Vaii, Drobeta-Turni Severin, Brebu Nou, Resita, Bocsa, Cariova, and other communities within about 200 km of the epicenter. NEIC reported intensity II in Breznita Ocol Mehesinti, Romania.  It was preceded by an M 3.3 which was lightly felt in the epicentral area. The last earthquake of M>=4.3 in Romania within about 200 km of this epicenter occurred  as an M 4.7 on September 8, 2013. An M 4.3 on June 9, 2016 occurred west of today's epicenter in Romania. Forecast 125083 had expected today's activity to the west was likely around  June 25. This epicenter is at 98 degrees from the Oaxaca, Mexico quake of June 23 and may have been enhanced by energy from that source.

 

O: 25JUN2020 17:36:07  44.7N   22.4E ML=3.0  EMSC   ROMANIA

O: 25JUN2020 14:20:52  44.7N   22.4E ML=3.3  EMSC   ROMANIA

O: 25JUN2020 17:30:16  44.7N   22.4E ML=4.3  EMSC   ROMANIA                      

O: 25JUN2020 17:30:16  44.7N   22.4E ML=4.5  ANSS   ROMANIA                      

P: 25JUN2020 125083    45.0N   18.0E 3.0-5.2 AACAA  Adriatic Sea               

 

The strongest earthquake in the U.S. or Canada today was an M 5.0 in the Fox Islands, Aleutians, Alaska. It was not reported felt in this epicentral area. The last event with M>=5 within about 200 km of this epicenter occurred on January 13, 2020 with M 5.0. The last of larger magnitude was an M 5.8 on October 26, 2019 and an M 5.9 on August 25, 2018. It is near the fifth node (72 degrees) from the Oaxaca, Mexico quake of June 23 and may have been enhanced by energy from that source. Forecast 125125 had expected today's event within about 25 km likely to occur around June 27.

 

O: 25JUN2020 09:24:22  52.0N  171.6W mb=5.0  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 27JUN2020 125125    52.1N  171.3W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

NG FAR-FIELD SEISMIC TRIGGERING FOLLOWS OAXACA, MEXICO M 7.5-7.7

 

EARTHQUAKE SUMMARY FOR JUNE 24, 2020

 

The magnitude of the earthquake in Oaxaca, Mexico, initially given as M 7.4 has been upgraded to M 7.5 and M 7.7 by many teleseismic reporters making it possibly the strongest global earthquake this year. It was followed today by a series of large and unusual earthquakes including an M 5.7-5.8 in the Lone Pine area of eastern California; an M 4.6 in Southern Idaho; an M 5.9-6.3 near Tokyo, Eastern Honshu, Japan and an M 5.5-6.0 in South Island, New Zealand. Yesterday this summary had published a listing of expected far-field seismic enhancement as:

 

 

"Far-field triggering is likely with this earthquake. Areas near 144 degrees include Minahasa, Indonesia where an M 5.9-6.1 occurred earlier today; India, Myanmar, Mayotte. The antipode at 16S 84E is in the Indian Ocean and is not seismic. Areas at 103 degrees from the Oaxaca epicenter include the east coast of Honshu, Japan and Guam as well as western Turkey and Greece and New Zealand from Cook Strait through South Island; the Vanuatu Islands. The fourth node at 90 degrees is prominent in the area south of the Kermadec Islands, the Kuril Islands, the French-Swiss Alps where an M 3.8 occurred earlier in the day.  A lack of moderate seismicity in the region of Honshu, Japan today is unsettling and may suggest a seismic quiescence following the Mexico M 7.4, a quiet which is likely to be broken soon." (June 23-24, 2020)

 

The strongest earthquake in the world today was an M 5.9-6.2 off the east coast of Honshu, Japan. According to NEIC it was widely felt with intensity V in Chiba, Tokyo, Saitama, Kanagawa, with lesser intensity in Tochigi, Gunma, Nagano,  Kanagawa, Gifu and Miyagi Prefectures. JMA reported this earthquake at M 6.2 was felt with intensity V in Chiba; IV in Ibaraki, and III in Ibaraki, Tochigi, Saitama, Tokyo, and Yamanashi Prefectures. The local magnitude is preferred as the area has geology which can confuse teleseismic magnitude determinations. A tsunami warning was not issued by JMA for this event. This epicenter is at 105 degrees from the M 7.5-7.7 in Oaxaca, Mexico yesterday and was likely promoted by concentrated energy from that source as was expected in the previous issue of this report (see above).

 

The last earthquake in the Tokyo area of Honshu, Japan with M>=5.9 occurred  on July 7, 2018 and December 28, 2016 both with M 5.9. The last with larger magnitude than M 6.2 was an M 6.4 on July 30, 2011 but an M 6.2 also occurred July 23, 2016. Forecast 125058 had expected this activity was likely within about 100 km around June 21.

 

O: 24JUN2020 19:47:46  35.5N  141.2E Mw=6.2  JMA    NEAR EAST COAST OF HONSHU, JAP

O: 24JUN2020 19:47:46  35.5N  141.0E Mw=5.9  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 21JUN2020 125058    35.0N  140.0E 4.0-5.9 BAAAA  Off East Coast Honshu      

 

An earthquake of M 5.5-6.0 shook the area of southwestern South Island, New Zealand today. NEIC reported maximum shaking IV in Te Anau and II-III in Queenstown, Wanaka, Riverton, Invercargil, Southland and Dunedin, Otago, New Zealand. GEONET reported 3737 people felt this quake with 1892 with weak intensity; 1483 with light intensity and 328 with moderate intensity. 24 reported strong shaking, 4 with severe intensity and 6 extreme intensity.

GeoNet reported M 5.9-6.0 for this event the preferred magnitude from the local network. The epicenter is at 104 degrees from the epicenter of the M 7.5-7.7 in Oaxaca, Mexico yesterday and was likely promoted by concentrated energy from that source is expected in previous issues of this report (see above).

 

The last earthquake in South Island, New Zealand with M>=6 within about 200 km  of today's epicenter occurred on August 5, 2009 with M 6.1 following a mainshock of M 7.7 on July 15, 2009.  Forecast 125215 had expected today's activity in the area in this region was likely around June 24. This epicenter is at 104-105 degrees from the M 7.7 earthquake in Oaxaca, Mexico yesterday and was probably promoted by concentrated energy from that source.

 

O: 25JUN2020 04:30:29  44.7S  167.5E ML=4.2  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 24JUN2020 22:20:01  44.6S  167.5E ML=6.0  GEONET reported 3737 people felt this quake

O: 24JUN2020 22:20:02  44.7S  167.5E Mw=5.5  EMSC   SOUTH ISLAND OF NEW ZEALAND

O: 24JUN2020 22:25:14  44.7S  167.6E ML=4.2  EMSC   SOUTH ISLAND OF NEW ZEALAND

P: 24JUN2020 125215    44.0S  169.0E 3.0-5.1 AAAAA  So. Island, N.Z.           

 

The strongest earthquake in the U.S. or Canada today was an M 5.8 in the Lone Pine region of California midway between the Ridgecrest aftershock zone and the Tonopah, Nevada aftershock zone. It appears to be the mainshock in the current series. NEIC reported maximum intensity VI in Independence and Lone Pine and IV in California at East Porterville, Porterville, Strathmore, Big Pine, Searles Valley, Lindsay, Woodlake, Ridgecrest, Farmersville and Exeter and II-III within about 150 km of the epicenter. As reported in the previous issue of this summary, this activity is located, along with that in Oaxaca, Mexico at the fourth node (90 degrees) from the M 7.4 south of the Kermadec Islands of June 18 and was probably promoted be energy from that source along with energy from Mexico which is at the 13th node from this series (28.2 degrees).

 

 

"This epicenter (in  Oaxaca, Mexico)  is located at the fourth node (90 degrees) from the M 7.4 earthquake in the Kermadec Islands and the M 7.7 in the northern Kurils of March 25, 2020  and was probably promoted by energy from that source. An unusual  earthquake earlier in Lone Pine, California was similarly located from the Kermadec Islands and commented on in the previous issue of this report" (June 23, 2020)

 

Following is a listing of events of M>=3 in the Lone Pine area of California today. A listing of events of M>=2 can be found in the "CALIFORNIA" regional section below.

 

O: 25JUN2020 00:09:30  36.5N  118.0W ML=3.2  EMSC   CENTRAL CALIFORNIA

O: 24JUN2020 21:12:48  36.5N  118.0W ML=3.6  EMSC   CENTRAL CALIFORNIA

O: 24JUN2020 19:02:17  36.5N  117.9W ML=3.1  EMSC   CENTRAL CALIFORNIA

O: 24JUN2020 19:02:17  36.5N  117.9W ML=3.1  EMSC   CENTRAL CALIFORNIA

O: 24JUN2020 18:20:37  36.5N  118.0W ML=3.5  EMSC   CENTRAL CALIFORNIA

O: 24JUN2020 17:59:19  36.5N  117.9W Mw=4.6  EMSC   CENTRAL CALIFORNIA

O: 24JUN2020 17:47:04  36.5N  117.9W ML=3.4  EMSC   CENTRAL CALIFORNIA

O: 24JUN2020 17:45:00  36.5N  117.9W ML=3.5  EMSC   CENTRAL CALIFORNIA

O: 24JUN2020 17:40:48  36.5N  118.0W Mw=5.8  EMSC   CENTRAL CALIFORNIA

P: 24JUN2020 125029    36.2N  117.9W 2.5-4.5 AAAAA  California/Nevada area     

P: 25JUN2020 125030    36.9N  117.4W 2.5-4.6 AAAAA  California/Nevada area     

 

 

A moderate earthquake of M 4.6 also hit the southern Idaho aftershock zone today. NEIC reported it was felt with maximum intensity IV in Idaho at Lowman; III in Stanley, Cascade, McCall, Idaho City, Ketchum, Horseshoe Bend and Ola and II in Garden Valley, Atlanta. It was reported as far as Utah and Oregon. This is the strongest aftershock to date of the M 6.5 mainshock of March 31, 2020 in Southern Idaho. In teh past 30 years only two other events have reached this magnitude in southern Idaho - both of M 4.6-4.7 on November 10, 1993 and January 28, 1995. Forecast 125100 had expected enhanced seismicity in the area was likely around June 23. It was probably promoted by energy from the M 7.5-7.7 in Oaxaca, Mexico yesterday. It is at the exact 11th node (32.7 degrees) from the Mexican mainshock.

 

O: 25JUN2020 05:21:01  44.4N  115.2W Mw=4.6  EMSC   SOUTHERN IDAHO

P: 23JUN2020 125100    44.5N  115.2W 2.0-4.1 AAAAA  Montana/Idaho              

 

The most unusual earthquake in the world today was an M 4.0 in southern and eastern Ghana. NEIC reported it was felt with intensity IV in the Accra area as Ashiaman, Gbawe, Oduponkpehe, Accra, Madina, Teshie, Aburi, Nungua and II-III in Dome, Aburi and Tema, Ghana. The solar eclipse of June 21 was first visible near this epicenter in Ghana at about 06:00 on June 21 although the total eclipse was visible over the Congo. It is likely this event which occurred near local solar midnight was promoted by tidal stresses associated with the eclipse. The epicenter is slightly less than 100 degrees from the M 7.7 in Mexico and was probably also excited by energy from that source. This is the strongest earthquake in Ghana within about 500 km of this epicenter since an M M 4.4 about 300 km to the northeast on September 1, 2009 and of M 4.4 on March 6, 1997 near today's epicenter. No other such events have been recorded in the region in the past 30 years.

 

O: 24JUN2020 22:53:52   5.6N    0.4W mb=4.0  EMSC   GHANA                        

 

Aftershocks also continued in the region off the coast of Oaxaca, Mexico. Following is a listing of events of M>=4 since last report. Several sets of parameters for the mainshock are also included below.

 

O: 24JUN2020 19:32:17  15.3N   96.2W ML=4.3  EMSC   OFFSHORE OAXACA, MEXICO

O: 25JUN2020 04:54:39  15.4N   95.8W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 19:01:55  15.5N   96.1W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 21:07:00  15.5N   96.1W ML=4.2  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 19:23:14  15.5N   96.3W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 20:06:17  15.5N   96.7W ML=4.8  EMSC   OFFSHORE OAXACA, MEXICO

O: 25JUN2020 05:35:36  15.5N   96.8W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 25JUN2020 03:00:45  15.6N   96.0W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 18:01:07  15.6N   96.1W ML=4.4  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 07:24:10  15.6N   96.3W ML=4.3  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 08:36:43  15.6N   96.5W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 09:47:28  15.7N   96.2W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 11:54:19  15.7N   96.5W ML=4.1  EMSC   OAXACA, MEXICO

O: 24JUN2020 18:49:51  15.8N   96.3W ML=4.1  EMSC   OAXACA, MEXICO

O: 24JUN2020 16:02:28  15.9N   95.9W ML=4.0  EMSC   OAXACA, MEXICO

O: 24JUN2020 13:43:53  16.0N   95.8W ML=4.0  EMSC   OAXACA, MEXICO

O: 24JUN2020 08:26:38  16.2N   95.9W ML=4.0  EMSC   OAXACA, MEXICO

O: 25JUN2020 04:15:36  15.3N   96.2W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO      

O: 23JUN2020 15:29:05  16.1N   95.8W ML=7.7  MOS    OAXACA, MEXICO

O: 23JUN2020 15:29:05  16.2N   95.7W ML=7.7  PTWC   OAXACA, MEXICO

O: 23JUN2020 15:29:05  16.1N   95.8W ML=7.5  EMSC   OAXACA, MEXICO

P: 28JUN2020 125002    16.0N   96.0W 3.5-5.1 AAAAA  Oaxaca, Mexico             

 

MAJOR EARTHQUAKE STRIKES OAXACA, MEXICO

 

PRELIMINARY EARTHQUAKE SUMMARY FOR JUNE 23, 2020

 

A major M 7.4-7.7 earthquake off the coast of Oaxaca, Mexico caused considerable damage in that region today. UNAM reported it was felt with moderate to extreme intensity in Mexico in the States of  Oaxaca, Guerrero, Chiapas, Michoacan, Jalisco, Queretaro, Morelos, Tabasco, Veracruz, Puebla and in the State of Mexico and in Mexico City. Their epicenter at M 7.5 is well south of that of teleseismic reporters and is typical for events in this area where local geology confuses travel time data for teleseismic stations. The local epicenter is to be preferred. A tsunami warning had been issued for possible waves up to 10 feet in height. Several centimeter sized tsunamis were identified but no major waves are known to have been generated by the mainshock. A minor tsunami was caught on camera and shown on YouTube. Pictures on the web showed considerable damage with much damage to the exterior of buildings especially in Oaxaca, Mexico. It was widely felt along the coast and inland to Mexico City. Several buildings collapsed and at least six people were killed. Many buildings and homes saw wide cracks. In La Crucecita about 200 buildings were damaged including 30 with little hope of repair. Landslides were common in the surrounding hills and mountains.  Power was knocked out in some areas. The epicenter is located near the longitude of maximum tidal stress with the new moon of June 21 as noted in previous issues of this report in the tidal seismicity forecast:

 

"The new moon arrived June 21 at 06:41 UT. ...  Longitudes which are sub-solar at this time are near 77 East and 103 West. These include areas of central Asia including Hindu Kush, India and Tajikistan in the east and the central and western U.S. and western Mexico in the west. These will experience the maximum tidal stresses and are most likely to see tidally triggered seismicity at this time. Many area, especially those where fluids are important modulators of seismicity, can experience tidal enhancement of seismicity, and several large earthquakes are likely in the next eight days. Tidal triggering often occurs near local solar midnight and noon when alignment is most linear." (June 18-22, 2020)

 

The last major event in eastern or central Mexico of M>=7.4 on September 8, 2017, while primarily triggered by a strong geomagnetic excursion, occurred two days after the full moon, much as occurred in the current situation. Previous major quakes in the area have also coincided with full and new moons suggesting strong tidal triggering in the region as detailed below:

 

"The full moon will arrive on September 6 (2017) at 07:03 UT. Longitudes which are antisolar at this time (local solar midnight) are near 110 West while those which are subsolar (local solar noon) are near 70 East longitude. These include areas of the Rocky Mountains and western Mexico in the west and central Asia in the east. It is in these regions where the highest probability of tidal triggering exists for the next week." (September 8, 2017)

 

Likewise the event of March 30, 2012 of M 7.4 to the west of today's epicenter was also associated with the new moon. At the time this summary noted this as:

 

"This could have been finalized by the tidal effects of the new moon alignment which is complete tomorrow.  Activity near Tokyo, Japan is at exactly 103 degrees from the Oaxaca epicenter. This area may see enhanced seismicity in the coming days due to this relation. The Oaxaca event is also at 103-104 degrees from an M 5.6 in South Island, New Zealand which occurred several hours earlier and at 104 degrees from Crete" (March 20, 2012)

Likewise an M 7.2 on February 16, 2018, the last such quake in central Mexico of M>=7 occurred, the new moon was complete the day before as noted in this summary at the time:

 

"The new moon arrived on February 15 (2018) at 21:05 UT." (February  16-17. 2018)

 

Because of its location near the Tropic of Capricorn, Mexico is no stranger to major earthquakes near the summer solstice when the sun is directly overhead. Such events occurred in 1897 (M 7.0); 1916 (M 7.1); 1928 (M 8.0) and  1982 (M 7.2) among others. This relation had been noted in the previous issues of this report as:

 

"On the first day of summer in the northern hemisphere, the sun reaches its zenith at about 23 degree North latitude due to the tilt of the earth's axis. Vertical tidal triggering is therefore maximized near 23 North latitude at this time of year. Seismicity can be seen to increase at this latitude as well as evidenced by today's India earthquake at 23 North latitude ...  at 22-24 degrees north latitude. The only seismic areas at this latitude in the western hemisphere are in the Gulf California and the north mid-Atlantic Ridge. (June 22, 2020)

 

This epicenter is located at the fourth node (90 degrees) from the M 7.4 earthquake in the Kermadec Islands and the M 7.7 in the northern Kurils of March 25, 2020  and was probably promoted by energy from that source. An unusual earthquake earlier in Lone Pine, California was similarly located from the Kermadec Islands and commented on in the previous issue of this report:

 

"South of Kermadec to Central Chile, Oaxaca, Mexico, Lone Pine, Ridgecrest, California, Western Nevada, Sumatra," (June 21-22, 2020) 

 

Note that Sumatra is among areas at this distance from the Kermadec Islands.

 

A foreshock occurred yesterday with M 4.9 in Oaxaca Mexico.  NEIC reported this earthquake of M 4.9 in Oaxaca, Mexico  was felt with intensity IV-V   in the area(s) of Oaxaca, Mexico at Xadani and Huafulco and II-III in Pochutla, Mitia, Tlacolula, and Puerto Escondido and possibly as far as Mexico City.  It was the strongest event of the day in North or South America. NEIC reported this earthquake of M 4.9 in Oaxaca, Mexico  was felt with intensity IV-V   in the area(s) of Oaxaca, Mexico at Xadani and Huafulco and II-III in Pochutla, Mitia, Tlacolula, and Puerto Escondido and possibly as far as Mexico City. The last earthquake of M>=7.4 in the area of Oaxaca within about 250 km of this epicenter was an M 7.4 on March 20, 2012. The only such event of greater magnitude in the area in the past 30 years was an M 7.4-7.5 on September 30, 1999. Forecast 124982 had expected this activity was likely around June 24.

 

NEIC reported the M 7.4 today was felt with maximum intensity IX (major damage)

in Huatulco, Oaxaca; VIII in Comitancillo; VI in Pochutla; V in Ocotian, and Mixtequilla and IV in Xadani, Puerto Escondido, Teotitlan, Tlalixtac and Santa Lucia del Camino, Oaxaca among others. An aftershock of M 5.0 was felt with intensity II in Mexico City and Tlalnepantla, Mexico. In their special report on this earthquake, UNAM reported more than 1200 aftershocks at this writing (www.sismologico.unam.mx). There was no information on possible tsunami waves in this report.

 

A series of forecasts had expected seismic enhancement in Oaxaca at this time.

 

O: 22JUN2020 18:34:26  16.2N   95.3W ML=4.1  EMSC   OAXACA, MEXICO               

O: 23JUN2020 01:17:18  16.2N   95.7W mb=4.9  EMSC   OAXACA, MEXICO               

O: 23JUN2020 15:29:04  16.1N   95.9W mb=7.4  EMSC   OAXACA, MEXICO               

O: 23JUN2020 15:29:04  15.6N   96.1W mb=7.5  UNAM   OAXACA, MEXICO               

O: 23JUN2020 21:42:55  15.5N   96.5W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 23JUN2020 18:04:56  15.5N   96.5W ML=4.3  EMSC   OFFSHORE OAXACA, MEXICO

O: 23JUN2020 20:19:02  15.5N   96.5W ML=4.3  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 03:27:00  15.5N   96.5W ML=4.5  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 02:25:53  15.5N   96.6W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 03:44:37  15.5N   96.6W ML=4.4  EMSC   OFFSHORE OAXACA, MEXICO

O: 23JUN2020 16:59:17  15.6N   95.9W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 23JUN2020 17:29:16  15.6N   95.9W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 23JUN2020 18:03:35  15.6N   95.9W ML=4.2  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 05:25:05  15.6N   96.1W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 07:24:10  15.6N   96.3W ML=4.3  EMSC   OFFSHORE OAXACA, MEXICO

O: 23JUN2020 21:27:44  15.6N   96.7W ML=4.4  EMSC   OFFSHORE OAXACA, MEXICO

O: 23JUN2020 17:32:28  15.7N   96.0W ML=4.2  EMSC   OFFSHORE OAXACA, MEXICO

O: 23JUN2020 17:34:34  15.7N   96.1W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 23JUN2020 20:16:38  15.7N   96.1W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 23JUN2020 23:20:58  15.7N   96.1W ML=4.2  EMSC   OFFSHORE OAXACA, MEXICO

O: 23JUN2020 16:20:24  15.7N   96.1W ML=4.3  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 03:11:18  15.7N   96.1W mb=4.5  EMSC   OFFSHORE OAXACA, MEXICO

O: 24JUN2020 02:33:21  15.8N   96.4W Mw=5.4  EMSC   OAXACA, MEXICO

O: 23JUN2020 18:27:11  15.9N   95.8W mb=5.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 23JUN2020 16:31:08  16.0N   95.7W mb=4.6  EMSC   OAXACA, MEXICO

O: 23JUN2020 17:45:23  16.0N   95.9W mb=4.1  EMSC   OAXACA, MEXICO

O: 23JUN2020 20:54:36  16.0N   95.9W mb=4.6  EMSC   OAXACA, MEXICO

O: 24JUN2020 03:05:33  16.2N   96.0W ML=4.2  EMSC   OAXACA, MEXICO

O: 23JUN2020 11:57:44  16.5N   95.1W ML=4.1  EMSC   OAXACA, MEXICO

O: 23JUN2020 17:52:20  15.4N   96.5W ML=4.3  EMSC   OFFSHORE OAXACA, MEXICO      

P: 19JUN2020 124752    16.0N   96.0W 3.5-5.1 BAAAA  Oaxaca, Mexico             

P: 24JUN2020 124982    15.0N   95.0W 3.5-5.2 AAAAA  Chiapas, Mexico            

P: 28JUN2020 125002    16.0N   96.0W 3.5-5.1 BAAAA  Oaxaca, Mexico             

P: 24JUN2020 124982    15.0N   95.0W 3.5-5.2 ABAAA  Chiapas, Mexico            

 

 

Far-field triggering is likely with this earthquake. Areas near 144 degrees include Minahasa, Indonesia where an M 5.9-6.3 occurred earlier today; India, Myanmar, Mayotte. The antipode at 16S 84E is in the Indian Ocean and is not seismic. Areas at 103 degrees from the Oaxaca epicenter include the east coast of Honshu, Japan and Guam as well as western Turkey and Greece and New Zealand from Cook Strait through South Island; the Vanuatu Islands. The fourth node at 90 degrees is prominent in the area south of the Kermadec Islands, the Kuril Islands, the French-Swiss Alps where an M 3.8 occurred earlier in the day.  A lack of moderate seismicity in the region of Honshu, Japan today is unsettling and may suggest a seismic quiescence following the Mexico M 7.4, a quiet which is likely to be broken soon.

 

An earthquake of M 5.9=6.0 shook areas of Guam today after the far-field forecast was published. NEIC reported it was felt with intensity IV in Guam at Yigo, Mongmong, Santa Rita and Tinia, Marianas and II-II in Guam at Talofofo, Hagatna Hts. Hagatna, Mangilao, Tamuning and Dededo. The last earthquakes of M>=5.9 within about 200 km of this epicenter in Guam occurred on February 11, 2018 and prior to that as an M 5.9 on October 6, 2014. The last of significantly larger magnitude was an M 6.7 on September 17, 2014.

 

O: 23JUN2020 17:50:25  14.0N  145.6E mb=5.9  EMSC   ROTA REGION, N. MARIANA ISLAND

P: 29JUN2020 125007    13.0N  143.0E 4.0-5.4 CABAA  So. Marianas/Guam          

 

An earthquake of M 4.5 occurred in the Gulf of Aden today. The annular solar eclipse of June 21 passed to the north of this epicenter but close enough to have had an impact on local seismicity. NASA shows the total eclipse was visible about 0-5 degrees to the east and north of this epicenter around 05:15 UT on June 21 and would have been nearly total at this epicenter.

 

O: 23JUN2020 16:31:57  13.7N   51.6E mb=4.7  EMSC   GULF OF ADEN                 

P: 29JUN2020 124987    13.0N   51.0E 3.5-5.0 CAAAA  Gulf of Aden               

 

There have been reports and video of strange animal behavior in several areas of

China. Local lore is that such behavior often preceded major earthquakes. Many of these odd occurrences include fish jumping out of water in Yunnan and other areas of southern China where the eclipse was visible on June 21. These observations appear to have been located in time near the time of the M 7.4 in the Kermadec Islands, New Zealand of June 18 and ground motions near 103 degrees in China at that time may have affected the fish. Literature over decades has documented odd animal behavior prior to major earthquakes, so this is an observation worth noting especially with the enhanced global seismicity of the past week and the eclipse. The largest earthquake along the path of the total eclipse of June 21 today occurred in Southern Sichuan, China in the neighborhood of these unusual animal behavior. This area is subject to major earthquakes. Recent extensive flooding in the area may also contribute to the possibiliy of a strong regional earthquake in the near term.

 

The event in southern China in eastern Sichuan was in the same area as an M 4.6

on May 21 and an M 4.7 on June 12. Forecast 125020 had expected this activity around June 27.

 

O: 23JUN2020 14:12:23  28.3N  104.8E mb=4.5  EMSC   EASTERN SICHUAN, CHINA       

P: 27JUN2020 125020    27.0N  104.0E 4.0-5.6 BBAAA  Myanmar                     

 

Seismicity also continued today in the region of eastern India and Myanmar following the M 5.8 in that area two days ago.

 

O: 23JUN2020 11:58:07  19.5N   77.1E ML=3.3  EMSC   MAHARASHTRA, INDIA           

P: 25JUN2020 124979    17.0N   74.0E 3.5-4.9 ACBAA  Arabian Sea                

 

O: 23JUN2020 13:47:32  23.9N   93.0E mb=3.6  EMSC   MYANMAR-INDIA BORDER REGION  

P: 29JUN2020 125019    26.0N   93.0E 4.0-5.5 CBAAA  Myanmar                    

 

O: 24JUN2020 07:28:13  28.8N   76.8E ML=2.8  EMSC   HARYANA - DELHI REGION, INDIA P: 13JUN2020 124796    34.0N   70.0E 3.8-5.2 AAAAA  Pakistan                   

P: 23JUN2020 125081    30.0N   82.0E 3.8-5.4 ABCAA  Xizang                     

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in Wyoming in the Grand Teton area.  NEIC reported this earthquake of M 3.6-3.9 in  Wyoming was felt with intensity II-III in the area(s) of Wyoming at Kelly, Jackson, Moran, Wilson, Alta, and in Driggs and Tetonia, Idaho.  This is the largest earthquake in this area of Wyoming within about 50 km of this epicenter since an M 4.8 on August 27, 2016 nearly four years ago. Forecast 125121 had expected today's event was likely around June 24.

 

O: 23JUN2020 14:02:39  43.6N  110.4W Ml=3.9  EMSC   WYOMING                       

P: 24JUN2020 125121    43.2N  111.0W 2.0-4.1 AAAAA  Yellowstone/Wyoming        

 

 

An M 5.9-6.3 in Sulawesi, Indonesia also occurred on June 23.  BMG reported it was felt with intensity IV at Bone Bolango, Bolaan, Uki dan Luwuk; III-IV in Gorontalo, Lokak, Ampana, Tutuyan; III in Soroako, Malili, Bitung, Kotamobagu and II in Palu, Manado, Toli-Toli and Masamba. The strongest earthquakes in the world today occurred in the Minahassa area of Indonesia with M 5.9-6.2 and in northern Philippines with M 5.1. This epicenter is near the terminix of the solar eclipse of June 21 and was probably promoted by tidal stresses associated with that event. The last earthquake within about 200 km of this epicenter in Sulawesi with M>=5.9 occurred on January 19, 2020 with M 6.1. An M 6.8 hit south of this on April 12, 2019, the only other event of M>5.9 since December, 2012.  Forecast 124945 had expected today's event within about 100 km was likely around June 26.

 

O: 23JUN2020 07:43:28   0.1N  123.8E ML=6.2  EMSC   MINAHASA, SULAWESI, INDONESIA

O: 23JUN2020 07:43:28   0.0N  123.8E ML=6.3  BMG    MINAHASA, SULAWESI, INDONESIA

O: 23JUN2020 07:43:27   0.2N  123.7E Mw=5.9  EMSC   MINAHASA, SULAWESI, INDONESIA

P: 26JUN2020 124945     1.0N  123.0E 4.0-5.6 BAAAA  Mindanao, Philippines      

P: 26JUN2020 124945     1.0N  123.0E 4.0-5.6 BAAAA  Mindanao, Philippines      

 

An earthquake of M 4.6-4.9 followed the Mexican M 7.4 in the Puerto Rico Trench north of the Island.  NEIC reported maximum shaking V in Puerto Rico at Hatillo and IV in Aguadilla, Manati and Las Marias and II-III in Isabela, Moca, Aguada, Arecibo, Rincon, San Sebastian. The last earthquake in the Puerto Rico Trench within about 50 km of today's epicenter occurred on November 29, 2019 more than half a year ago. Today's event was probably triggered by energy from Mexico. Forecast 125005 had expected today's event around June 22.

 

O: 23JUN2020 23:06:54  19.2N   67.0W Md=3.4  EMSC   PUERTO RICO REGION

O: 23JUN2020 20:34:01  19.2N   67.1W mb=4.6  EMSC   PUERTO RICO REGION

O: 23JUN2020 17:03:16  19.1N   67.0W Md=3.1  EMSC   PUERTO RICO REGION           

P: 22JUN2020 125005    19.0N   66.0W 3.4-5.2 AAAAA  Puerto Rico                

 

STRONG QUAKES AT ECLIPSE TERMINAL LONGITUDE

 

EARTHQUAKE SUMMARY FOR JUNE 22, 2020

 

The strongest earthquakes in the world today occurred in the Minahassa area of Indonesia with M 5.9-6.2 and in northern Philippines with M 5.1. These epicenters are near the terminix of the solar eclipse of June 21 and were probably promoted by tidal stresses associated with that event. The last earthquake within about 200 km of this epicenter in Sulawesi with M>=5.9 occurred on January 19, 2020 with M 6.1. An M 6.8 hit south of this on April 12, 2019, the only other event of M>5.9 since December, 2012.  Forecast 124945 had expected today's event within about 100 km was likely around June 26.

 

O: 23JUN2020 07:43:28   0.1N  123.8E ML=6.2  EMSC   MINAHASA, SULAWESI, INDONESIA

P: 26JUN2020 124945     1.0N  123.0E 4.0-5.6 BAAAA  Mindanao, Philippines      

 

The earthquake in the northern Philippines of M 5.1 was widely felt in this area.  NEIC reported this earthquake of M 5.1 in the Northern Philippines was felt with intensity II-III in the area(s) of the Northern Philippines at Paringao, Ilocos and Baguio, Cordillera.  PHIVOLCS reported intensity IV in Candon City, Ilocos Sur; III in Vigan City, Sinait, Santa and Magsingal, Sta. Lucia, Santa Maria, Sta, Cruz, San Esteban, Ilocos Sur; Luna, Bangar, Bacnota, San Juan, Bauang, and San Fernando City, La Union and II in Cabugao, San Juan, Bantay, San Ildefonse, Narvacan, Nagbukel, Tagudin, Burgos, Santiag, Sigay, Suyo, Ilocos Sur, Banna, Bacarra, Laoag City and Batac Ilocos Norte. While an M 5.1 hit about 100 km southeast of today's epicenter on May 28, 2020, the last event of larger magnitude within about 150 km was an M 5.7 on October 2, 2016.

Forecast 124991 had expected regional activity around June 25 and a moderate quake in northern Philippines had been anticipated with the solar eclipse.

 

O: 22JUN2020 08:02:44  17.1N  120.0E Mw=5.1  EMSC   PHILIPPINE ISLANDS REGION    

P: 25JUN2020 124991    12.0N  121.0E 3.5-4.9 BCAAA  Luzon, Philippines         

 

As occurred with the eclipse itself, a series of moderate earthquakes continued today along the eclipse path using up residual tidal energy from the alignment.

The strongest events in the Western Hemisphere outside the Kermadec Islands aftershock zone occurred in the East Pacific Rise at 23S 112E. This is near-antipodal to the maximum eclipse site in India-Nepal and Gujarat, India and was not unexpected on this account. The forecast for seismicity associated with the eclipse/new moon had read:

 

"The new moon arrived June 21 at 06:41 UT. This involved an annular solar eclipse visible in the areas of Central Africa, Southern Asia, China and the Pacific with maximum at 06:41 UT. Maximum eclipse occurs over northern India, Nepal, Hindu Kush and Pakistan, an area which has seen enhanced seismicity in recent days including some unusual events at Gujarat, India and others. The eclipse will pass over Taiwan and the southern Ryukyu Islands as well as southern Iran and Pakistan and southern China. Most of these areas will probably see enhanced seismicity with this eclipse with a moderate chance of a major earthquake within a week of the eclipse in southern Asia. Longitudes which are sub-solar at this time are near 77 East and 103 West. These include areas of central Asia including Hindu Kush, India and Tajikistan in the east and the central and western U.S. and western Mexico in the west. These will experience the maximum tidal stresses and are most likely to see tidally triggered seismicity at this time. Many area, especially those where fluids are important modulators of seismicity, can experience tidal enhancement of seismicity, and several large earthquakes are likely in the next eight days. Tidal triggering often occurs near local solar midnight and noon when alignment is most linear." (June 18-22, 2020)

 

and

 

"solar eclipse of June 21. The strongest tidal stresses with a solar eclipse occur near the path of totality. The path of that annular eclipse passes from southern Iran to Pakistan, Afghanistan, India, Nepal, Southern China, Taiwan and the Southern Ryukyu Islands of Japan. Some increases in seismicity may occur in these regions and near the  antipode which crosses South America near northern Chile where an M 6.8 occurred on June 3, 2020. A strong aftershock is possible in that area at this time” (June 20, 2020)

 

A major earthquake occurred on June 23, 2001 in southern Peru about two days after a solar eclipse was observed in the area. The HISTORY section of his report details that event as:

 

 6 23 20 33 14 2001 -16.265  -73.641  33 8.4   Near the coast of Peru          

 

The earthquake killed at least 75 including at least 26 by a tsunami.  Nearly 18,000 homes were destroyed and more than 35,000 damaged in Arequipa, Camana and Tacna while injuring nearly 2700. Besides the 26 killed by the tsunami an additional 64 were missing. Many historic buildings were damaged or destroyed at Arequipa. Landslides blocked many highways. The earthquake followed by several days a total eclipse of the sun in the area. A tsunami was generated with maximum height to 7 meters and inundated up to 1 km inland.

 

 

The earthquakes of M 4.9 and 5.0 are the strongest within about 150 km of those  events in the Easter Island region of the East Pacific since a series on May 2, 2018 which included an event of M 6.0 and several others of M>=5. Forecast 125190 had expected today's event near the antipode of the solar eclise in India and Nepal was likely around June 27 in the East Pacific.

 

O: 22JUN2020 14:30:46  22.9S  112.3W mb=4.9  EMSC   EASTER ISLAND REGION         

O: 22JUN2020 13:23:44  23.0S  112.5W mb=5.0  EMSC   EASTER ISLAND REGION         

P: 27JUN2020 125190    25.0S  112.0W 4.0-5.4 BBAAA  So. East Pacific Rise      

 

O: 22JUN2020 11:09:58  19.5N   83.1E ML=3.6  EMSC   ORISSA, INDIA                

 

O: 22JUN2020 13:37:16  38.6N   70.7E mb=4.8  EMSC   TAJIKISTAN                   

P: 28JUN2020 125046    37.0N   70.0E 3.8-5.2 CBAAA  Hindu Kush/Pakistan        

P: 28JUN2020 125047    39.0N   72.0E 3.8-5.3 CBAAA  Hindu Kush/Pakistan        

 

O: 22JUN2020 10:38:13  44.1N   86.7E mb=4.4  EMSC   NORTHERN XINJIANG, CHINA     

P: 16JUN2020 124826    44.0N   82.0E 4.0-5.6 CACAA  Kirgizstan/Xinjiang        

 

O: 22JUN2020 13:29:13  24.3N  122.9E mb=4.4  EMSC   TAIWAN REGION                

P: 24JUN2020 125022    25.0N  123.0E 4.0-6.2 AAAAA  Ryukyu Islands             

 

O: 22JUN2020 07:10:24  25.8N   94.5E ML=2.8  EMSC   MYANMAR-INDIA BORDER REGION  

P: 29JUN2020 125019    26.0N   93.0E 4.0-5.5 CABAA  Myanmar                    

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the Lone Pine area of California near the Nevada border. This is not an aftershock of the Ridgecrest group north of the Tonopah, Nevada earthquakes of M 7.1 and 6.5 and represents a new regional mainshock. Like the Ridgecrest event of July 4, 2019 which started this group of earthquakes, today's event occurred two days

after a solar eclipse. NEIC reported maximum intensity IV in Independence and Lone Pine and II-III in California at Springville, Three Rivers, Sequoia National Park, Kings Canyon, Big Pine, Porterville, Ridgecrest and Lake Isabella among others. An aftershock of M 3.8 was felt in the Lone Pine, California area with intensity III and II in Three Rivers, California. The quake occurred near local solar noon and was probably promoted by high tidal stresses associated with the new moon/eclipse of June 21. The last earthquake within about 50 km of today's epicenter with M>=4.6 occurred on May 3, 2011 with M 4.5. Two earthquakes about 50 km southeast of this epicenter accompanied the Ridgecrest aftershocks on July 11 and July 18, 2019. The last major series of earthquakes in the area of today's epicenter occurred in early October (1 and 3), 2009 reaching maximum size of M 5.2. Today's event is at the fourth node (90 degrees) from the M 7.4 in the Kermadec Islands of June 18 and also from the M 6.7 in the Ryukyu Islands of June 13, 2020 and was probably promoted by energy from those sources. Forecast 125029 had expected today's activity within about 25 km of this epicenter was likely around June 24.

 

O: 23JUN2020 03:07:55  36.5N  118.0W Ml=2.2  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 02:51:58  36.5N  118.0W Mw=3.8  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 02:51:58  36.5N  118.0W Mw=3.8  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 02:38:35  36.5N  118.0W ML=2.3  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 02:01:40  36.5N  118.0W ML=2.3  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 02:01:40  36.5N  118.0W ML=2.3  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 06:48:10  36.5N  118.0W Ml=3.1  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 01:46:07  36.5N  118.0W ML=2.6  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 01:39:49  36.5N  118.0W ML=2.5  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 00:44:29  36.4N  118.0W ML=2.2  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 00:36:59  36.5N  118.0W ML=2.2  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 00:33:56  36.4N  118.0W ML=2.8  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 00:30:52  36.5N  118.0W ML=3.7  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 00:26:46  36.5N  118.0W ML=3.3  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 00:25:44  36.5N  118.0W mb=4.5  EMSC   CENTRAL CALIFORNIA

O: 23JUN2020 00:25:46  36.4N  117.9W mb=4.6  ANSS   CENTRAL CALIFORNIA

O: 22JUN2020 14:08:09  36.5N  118.0W ML=2.3  EMSC   CENTRAL CALIFORNIA

O: 22JUN2020 14:08:09  36.5N  118.0W ML=2.3  EMSC   CENTRAL CALIFORNIA           

P: 24JUN2020 125029    36.2N  117.9W 2.5-4.5 AAAAA  California/Nevada area     

 

The strong swarm of earthquakes in Iceland largely dissipated today. The strongest of today's events was an M 4.0 which went unfelt. An M 3.1 occurred at a new epicenter southwest of the larger recent quakes. Forecasts 125152 had expected today's activity around June 22-25.

 

O: 23JUN2020 03:35:15  63.2N   24.1W ML=3.1  EMSC   ICELAND REGION               

P: 25JUN2020 125152    62.0N   27.0W 4.0-5.8 ABBAA  Iceland area               

 

O: 22JUN2020 11:30:13  66.2N   18.5W ML=3.2  EMSC   ICELAND REGION

O: 22JUN2020 11:10:26  66.4N   18.7W ML=3.0  EMSC   ICELAND REGION

O: 22JUN2020 12:17:39  66.4N   18.7W ML=4.0  EMSC   ICELAND REGION

O: 22JUN2020 07:42:26  66.5N   18.7W ML=3.1  EMSC   ICELAND REGION

O: 22JUN2020 20:47:27  66.2N   18.5W ML=3.0  EMSC   ICELAND REGION               

P: 22JUN2020 125152    64.0N   18.0W 4.0-5.6 ABAAA  Iceland area               

 

An unusual earthquake of M 3.8 was also felt in eastern France today.  EMSC reported it was felt with loud thunderous noises in the area of France near Vallorcine, Chamonix-Mont-Blanc, Servoz, Les Houches, and in  Charrat, Fully, Champery, Orsieres, Martigny-ville,  Martigny-Combe, Switzerland, and up to 70 km from the epicenter in Blecherette, Switzerland. The last earthquake with M>=3.8 in this area of the French-Swiss Alps occurred on July 1, 2017 with M 4.1.  Forecast 125091 had expected today's activity to the south was likely around June 26.

 

O: 23JUN2020 06:25:42  46.0N    7.0E ML=3.8  EMSC   FRANCE                       

P: 26JUN2020 125091    44.0N    7.0E 3.0-5.2 BBAAA  Italy                      

 

 

NEIC reported an earthquake of M 4.9 in Oaxaca, Mexico  was felt with intensity IV-V   in the area(s) of Oaxaca, Mexico at Xadani and Huafulco and II-III in Pochutla, Mitia, Tlacolula, and Puerto Escondido and possibly as far as Mexico City. This earthquake is located at the fourth node (90 degrees) from the Kermadec M 7.4 and near the longitude of maximum tidal stresses with the new moon as noted above and in previous issues of this summary. The M 4.9 is the strongest in the America's today. Further seismicity in this area is expected in the next several days. Forecat 124982 had expected a moderate earthquake in this area around June 24.

 

 

O: 22JUN2020 18:34:26  16.2N   95.3W ML=4.1  EMSC   OAXACA, MEXICO               

O: 23JUN2020 01:17:18  16.2N   95.7W mb=4.9  EMSC   OAXACA, MEXICO               

P: 24JUN2020 124982    15.0N   95.0W 3.5-5.2 ABAAA  Chiapas, Mexico            

 

SOLAR ECLIPSE; KERMADEC ISLANDS M 7.4 CONTROL MAJOR GLOBAL SEISMICITY

 

EARTHQUAKE SUMMARY FOR JUNE 21, 2020

 

As expected in previous issues of this summary, most of the major global seismicity today occurred at locations where it appears to have been triggered by effects from the M 7.4 in the Kermadec Islands of June 18 or by tidal effects from the new moon and solar eclipse today or a combination of both. The largest earthquake in the world today was an M 6.0 in the Iceland swarm of the past two days. This epicenter is at 144 degrees from the Kermadec Islands. A moderately strong earthquake also occurred with M 5.7-5.8 today in the region of Mizoram, India near Bangladesh and Myanmar. This is at 103 degrees from the Kermadec epicenter. The area had just experienced an annular solar eclipse several hours earlier and an M 5.1 foreshock with that eclipse. Seismic energy from large earthquakes reflects and refracts off the inner core- outer core boundary and is returned to the surface in this distance range, often with a high concentration of energy. It is likely that it helps trigger additional seismicity at this distance in the days following large earthquakes. Likewise, energy reflected and refracted off the core-mantle boundary is returned to the surface near 103 degrees from the epicenter of the origin of the energy and can also help trigger seismic activity at this distance in the days following major surface events on the earth.  In previous issues of this summary it had been noted that both the eclipse and the energy from the Kermadec Islands would likely promote seismicity at this time as:

 

 

"At least one area has shown signs of increased seismicity following the event in the Kermadec Islands. An M 4.1 in Iceland occurred 20 minutes after the event of M 7.4 in the Kermadec Islands. This is the time it takes for a reflected P-wave off the core-mantle boundary takes to travel the 144 degrees from the Kermadec Islands to Iceland, and it is highly likely this event in Iceland was a reaction to that seismic energy. A strong cusp of energy occurs at 144 degrees from large surface events and often is associated with significant increases in seismicity at this distance. More such activity is likely in coming days, including a possible volcanic event in Iceland. This summary had expected active seismicity in Iceland around June 17 within  about 100 km of this in forecast 124879." (June 20, 2020)

 

and

 

"Areas near 103 and 144 degrees from the M 7.4 south of the Kermadec Islands of June 18 which are seismic are few, so far-field triggering from that event may be limited. Among the most likely to see significantly enhanced seismicity in the next week are Iceland and eastern Turkey at 144 degrees and the central U.S. including Oklahoma, Missouri, Wyoming, Montana, northern Alaska, areas near western Cuba, Colombia, the South Mid-Atlantic and Bangladesh, India, Myanmar and southern China near 103 degrees from the Kermadec event. ... " (June 20, 2020)

 

and

 

"The new moon will arrive June 21 at 06:41 UT. This involves an annular solar eclipse visible in the areas of Central Africa, Southern Asia, China and the Pacific with maximum at 06:41 UT. Maximum eclipse occurs over northern India, Nepal, Hindu Kush and Pakistan, an area which has seen enhanced seismicity in recent days including some unusual events at Gujarat, India and others. The eclipse will pass over Taiwan and the southern Ryukyu Islands as well as southern Iran and Pakistan and southern China. Most of these areas will probably see enhanced seismicity with this eclipse with a moderate chance of a major earthquake within a week of the eclipse in southern Asia. Longitudes which are sub-solar at this time are near 77 East and 103 West. These include areas of central Asia including Hindu Kush, India and Tajikistan in the east and the central and western U.S. and western Mexico in the west. These will experience the maximum tidal stresses and are most likely to see tidally triggered seismicity at this time. Many area, especially those where fluids are important modulators of seismicity, can experience tidal enhancement of seismicity, and several large earthquakes are likely in the next eight days. Tidal triggering often occurs near local solar midnight and noon when alignment is most linear." (June 19-20, 2020)

 

The earthquake in India/Myanmar today occurred near the sub-solar point at the time of the total eclipse. The sub-solar point is the point on the earth's surface where the sun is directly overhead at local solar noon. On the first day of summer in the northern hemisphere, the sun reaches its zenith at about 23 degree North latitude due to the tilt of the earth's axis. Vertical tidal triggering is therefore maximized near 23 North latitude at this time of year. Seismicity can be seen to increase at this latitude as well as evidenced by today's India earthquake at 23 North latitude; the Gujarat, India quake of M 5.5 on June 14; the M 5.5 in Taiwan of June 13 and a series in the southern Ryukyu Islands (M 5.0-5.6) over the past five days - all at 22-24 degrees north latitude. The only seismic areas at this latitude in the western hemisphere are in the Gulf California and the north mid-Atlantic Ridge.

 

The earthquake in the India-Myanmar border region of M 5.5-5.8 was reported by NEIC to have been felt with intensity IV in Mizoram, India at Champhai, Lunglei, Aizawl, and in Manipur and in Bangladesh at Chattagam, Jalakati and III in Comilla. The M 5.1 foreshock occurred north of this epicenter and was felt with intensity IV in Mizoram, India at Aizawl, in Manipur and in Lala, Assam and II-III in Sairang, Champhai, Silchar, Dharmanagar, Karimanj and Sihat, Bangladesh. This activity follows several shocks to the area that began with the landfall of

Tropical Cyclone Amphan in late May, 2020.  It was immediately followed by an M 4.5 in Bangladesh and an M 4.2 near the  Bangladesh-India border. Two foreshocks of M 4.7-4.8 hit the region on June 14 and 16. The landfall of TC Amphan was at 103 degrees from the subsequent M 7.4 in the Kermadec Islands, New Zealand, just as today's events are at 103 degrees from that M 7.4 in the Kermadec Islands. Forecast 125018 and 125019 had expected today's activity in Myanmar within about 200 km was likely around June 23-29. The last earthquake within about 300 km of today's mainshock with equal or greater magnitude than M 5.8 occurred on April 16, 2020 with M 5.9, the last of significantly larger magnitude was an M 6.9 on April 13, 2016.

 

O: 21JUN2020 22:40:52  23.2N   93.3E Mw=5.5  MIS    MYANMAR-INDIA BORDER REGION

O: 21JUN2020 22:40:52  23.2N   93.3E Mw=5.8  ANSS   MYANMAR-INDIA BORDER REGION

O: 21JUN2020 22:40:52  23.5N   93.3E Mw=5.7  CEIC   MYANMAR-INDIA BORDER REGION

O: 21JUN2020 10:46:23  23.9N   93.1E Mw=5.1  EMSC   MYANMAR-INDIA BORDER REGION

O: 21JUN2020 10:46:23  23.8N   92.9E Mw=5.1  MIS    MYANMAR-INDIA BORDER REGION

O: 21JUN2020 22:40:52  23.2N   93.3E Mw=5.6  EMSC   MYANMAR-INDIA BORDER REGION  

P: 23JUN2020 125018    25.0N   97.0E 4.0-5.7 ABCAA  Myanmar                    

P: 24JUN2020 125019    27.0N   92.0E 4.0-5.8 BCAAA  Myanmar                    

P: 29JUN2020 125019    26.0N   93.0E 4.0-5.5 CCAAA  Myanmar                    

 

In addition to the events in India/Myanmar today a series of moderate quakes followed the path of the eclipse. These included from west to east with the eclipse moderate events in the Congo (M 4.2); southern Iran (M 3.7, 3.7); Hindu Kush, Afghanistan (M 3.9); Tajikistan (M 4.2); Nepal/Xizang, China (M 4.6) near the point of maximum eclipse; Southern China (M 3.2) and Taiwan and the northern Philippines (M 4.0). Most of these were lightly felt and occur in or near the path of totality. This was the pattern expected with this solar eclipse in previous issues of this summary.

 

 

O: 21JUN2020 13:56:49   1.6S   28.6E mb=4.2  EMSC   LAC KIVU REGION, CONGO        

P: 25JUN2020 124961     2.0S   29.0E 3.0-4.9 BAAAA  Lake Victoria area         

 

NEIC reported this earthquake of M 4.2 in the Congo (DR)  was felt with intensity II-III in the area(s) of the Congo (DR) at Goma and Beni.

 

O: 21JUN2020 17:39:08  32.3N   85.5E Mw=4.6  MIS    NEPAL                        

O: 21JUN2020 17:39:01  32.9N   85.7E mb=4.4  EMSC   WESTERN XIZANG               

P: 19JUN2020 124816    31.0N   84.0E 3.8-5.3 ABBAA  Xizang                     

 

O: 21JUN2020 09:40:03  33.0N   99.1E Mw=2.1  CEIC   SOUTHERN CHINA               

P: 25JUN2020 125071    37.0N   95.0E 3.5-4.9 BCCAA  So. China                  

 

O: 21JUN2020 18:40:16  37.1N   71.2E Mw=4.3  MIS    TAJIKISTAN                   

P: 25JUN2020 125046    36.0N   71.0E 3.8-5.7 BBAAA  Hindu Kush/Pakistan        

 

O: 21JUN2020 18:15:57  36.0N   69.2E Mw=3.9  MIS    HINDU KUSH,AFGHANISTAN       

P: 25JUN2020 125046    37.0N   69.0E 3.8-5.4 BAAAA  Hindu Kush/Pakistan        

 

O: 21JUN2020 21:46:05  27.3N   56.7E ML=3.7  EMSC   SOUTHERN IRAN                

P: 19JUN2020 124764    27.0N   56.0E 3.5-5.1 AAAAA  So. Iran/Persian Gulf      

 

O: 21JUN2020 08:05:40  27.6N   53.4E ML=3.7  EMSC   SOUTHERN IRAN                

P: 25JUN2020 125023    28.0N   52.0E 3.5-5.6 BAAAA  So. Iran/Persian Gulf      

 

O: 22JUN2020 01:06:11  38.3N   45.1E ML=4.0  EMSC   NORTHWESTERN IRAN            

P: 23JUN2020 125085    40.0N   44.0E 3.5-5.0 ABAAA  Caucasus/Caspian Sea       

 

O: 21JUN2020 13:19:12  23.1N  120.8E ML=4.0  TAI    Hualien, Taiwan               

P: 24JUN2020 125024    23.0N  122.0E 4.0-5.8 BAAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity II in Taitung, and I in Kaohsiung, Tainan and Hualien Counties, Taiwan.

 

 

The M 6.0 in Iceland was the strongest earthquake in the world today. NEIC reported it was felt with intensity III-IV in Nordurland, Iceland at Husavik, Akureyri, and Kristnes.  This is part of series of events over the past two days which has included those of M 5.7, 5.6 and 5.4. It was followed by a number of moderate aftershocks and preceded by many foreshocks. The M 6.0 is the strongest earthquake recorded in Iceland since an M 6.2-6.3 on May 29, 2008 and an M 6.8 and M 6.5 on June 17 and 21, 2000 (exactly 20 years ago today). Forecasts 124879 and 125152 had expected today's activity in Iceland was likely around June 17-22. These events are located at 144 degrees from the M 7.4 south of the Kermadec Islands of June 18, 2020 and were probably promoted by energy from that source. Fluid motions accompanying strong tides from the new moon probably also enhanced this series at this time.

 

O: 21JUN2020 12:51:41  66.3N   18.5W ML=3.9  EMSC   ICELAND REGION

O: 21JUN2020 19:46:17  66.3N   19.0W mb=4.4  EMSC   ICELAND REGION

O: 21JUN2020 18:25:47  66.4N   18.6W ML=3.4  EMSC   ICELAND REGION

O: 21JUN2020 17:36:18  66.4N   18.7W ML=3.4  EMSC   ICELAND REGION

O: 21JUN2020 20:00:14  66.4N   18.7W ML=3.4  EMSC   ICELAND REGION

O: 22JUN2020 02:04:19  66.4N   18.7W ML=3.4  EMSC   ICELAND REGION

O: 21JUN2020 19:37:52  66.4N   18.7W ML=3.5  EMSC   ICELAND REGION

O: 21JUN2020 19:36:05  66.4N   18.7W ML=3.8  EMSC   ICELAND REGION

O: 21JUN2020 19:10:42  66.4N   18.7W ML=4.0  EMSC   ICELAND REGION

O: 21JUN2020 19:14:48  66.4N   18.7W ML=4.1  EMSC   ICELAND REGION

O: 21JUN2020 19:07:55  66.4N   18.7W Mw=6.0  EMSC   ICELAND REGION

O: 21JUN2020 19:18:37  66.4N   18.8W ML=3.7  EMSC   ICELAND REGION

O: 21JUN2020 19:29:17  66.4N   18.8W mb=4.5  EMSC   ICELAND REGION

O: 22JUN2020 03:58:19  66.5N   18.7W ML=3.4  EMSC   ICELAND REGION

O: 21JUN2020 18:20:10  66.5N   19.0W mb=4.4  EMSC   ICELAND REGION

O: 21JUN2020 23:42:26  66.6N   18.8W ML=3.6  EMSC   ICELAND REGION

O: 21JUN2020 19:57:08  66.6N   18.9W mb=4.5  EMSC   ICELAND REGION

O: 21JUN2020 20:02:49  66.6N   19.5W ML=3.4  EMSC   ICELAND REGION

O: 21JUN2020 21:26:28  66.2N   19.2W mb=4.2  EMSC   ICELAND REGION               

P: 17JUN2020 124879    65.0N   17.0W 3.0-5.0 BAAAA  Iceland area               

P: 22JUN2020 125152    64.0N   18.0W 4.0-5.6 AAAAA  Iceland area                

 

STRONG EARTHQUAKE SERIES IN NORTHERN ICELAND

 

EARTHQUAKE SUMMARY FOR JUNE 20, 2020

 

A series of moderate to moderately large earthquakes was felt in northern Iceland today. NEIC reported these events of M 5.4, 5.6 and 5.7 were felt with intensity III-IV in Iceland at Husavik and Akureyn, Nordurland and in Grenivik, Iceland with intensity III. They were also felt as far the Faroe Islands.

This summary had anticipated this activity in Iceland at this time in the previous issue as:

 

"At least one area has shown signs of increased seismicity following the event in the Kermadec Islands. An M 4.1 in Iceland occurred 20 minutes after the event of M 7.4 in the Kermadec Islands. This is the time it takes for a reflected P-wave off the core-mantle boundary takes to travel the 144 degrees from  the Kermadec Islands to Iceland, and it is highly likely this event in Iceland was a reaction to that seismic energy. A strong cusp of energy occurs at 144 degrees from large surface events and often is associated with significant increases in seismicity at this distance. More such activity is likely in coming days, including a possible volcanic event in Iceland. This summary had expected active seismicity in Iceland around June 17 within  about 100 km of this in forecast 124879." (June 20, 2020)

 

and

 

"Areas near 103 and 144 degrees from the M 7.4 south of the Kermadec Islands of June 18 which are seismic are few, so far-field triggering from that event may be limited. Among the most likely to see significantly enhanced seismicity in the next week are Iceland and eastern Turkey at 144 degrees and the central U.S. including Oklahoma, Missouri, Wyoming, Montana, northern Alaska, areas near western Cuba, Colombia, the South Mid-Atlantic and Bangladesh, India, Myanmar and southern China near 103 degrees from the Kermadec event. Southern Spain and Morocco are near the antipode of the Kermadec Islands. One or more of these areas is likely to see a significant earthquake, especially with the new moon." (June 20, 2020)

 

Today's activity began with an M 5.4 near local solar noon and continued throughout the day. It may have been promoted by the new moon which arrives today. The M 5.7 is the strongest event located in Iceland since a similar M 5.7 on August 26, 2014 and an M 5.7-5.8 on September 16, 2002, the only two such events within Iceland within about 250 km of today's epicenter in the past 30 years. Forecast 124879 had expected today's Iceland activity was likely around June 17. This activity is located at 144-145 degrees from the M 7.4 south of the Kermadec Islands of June 18 and was probably promoted by energy from that source.

 

O: 21JUN2020 02:50:46  66.2N   18.7W mb=4.2  EMSC   ICELAND REGION

O: 20JUN2020 19:38:46  66.3N   18.4W ML=4.1  EMSC   ICELAND REGION

O: 20JUN2020 15:05:10  66.3N   18.4W mb=5.4  EMSC   ICELAND REGION

O: 20JUN2020 15:42:03  66.3N   18.5W ML=3.5  EMSC   ICELAND REGION

O: 21JUN2020 00:22:13  66.3N   18.5W ML=3.6  EMSC   ICELAND REGION

O: 20JUN2020 16:39:33  66.3N   18.5W ML=4.1  EMSC   ICELAND REGION

O: 20JUN2020 19:35:36  66.3N   18.6W ML=3.8  EMSC   ICELAND REGION

O: 20JUN2020 19:26:23  66.3N   18.6W Mw=5.7  EMSC   ICELAND REGION

O: 20JUN2020 20:11:18  66.3N   18.8W mb=4.5  EMSC   ICELAND REGION

O: 20JUN2020 15:08:09  66.4N   18.5W ML=3.7  EMSC   ICELAND REGION

O: 20JUN2020 15:22:50  66.4N   18.9W ML=3.8  EMSC   ICELAND REGION

O: 20JUN2020 19:49:07  66.1N   17.9W ML=3.7  EMSC   ICELAND REGION               

P: 17JUN2020 124879    65.0N   17.0W 3.0-5.0 BBAAA  Iceland area               

 

O: 20JUN2020 22:23:57  63.8N   22.1W ML=3.6  EMSC   ICELAND REGION               

O: 20JUN2020 19:26:54  64.2N   20.1W ML=5.6  EMSC   ICELAND                      

P: 17JUN2020 124879    65.0N   17.0W 3.0-5.0 BABAA  Iceland area               

P: 22JUN2020 125152    64.0N   18.0W 4.0-5.6 AAAAA  Iceland area               

 

 

A moderate earthquake of M 4.2 occurred today in northern Oklahoma. It was  reported by NEIC to have been felt with intensity IV n Perry, Stillwater and Billings, Oklahoma and II-III in Much of northern Oklahoma and southern Kansas including in Oklahoma at Lucien, Covington, Garber, Morrison, Marshall, and in Kansas within about 300 km of the epicenter and in Missouri within about 400 km of the epicenter with intensity up to IV. Seismicity is often elevated in Oklahoma and Kansas at times of new moons. Tidal stresses probably promote movement of groundwater lubricating local small faults. The last earthquake of M>=4.2 in Oklahoma or Kansas was an M 4.5 on January 19, 2020. The only other such event in the past year was an M 4.2 on August 16, 2019, an event associated with the full moon. Forecasts 124809 and 125075 had expected today's activity around June 18-21. This epicenter is at 103 degrees from the Kermadec Islands quake of M 7.4 of June 18, and was likely promoted by concentrated energy from that source as well.

 

O: 21JUN2020 03:15:41  36.3N   97.4W mb=4.2  EMSC   OKLAHOMA                     

P: 18JUN2020 124809    35.0N   97.0W 2.0-4.1 BBAAA  Southern Plains            

P: 21JUN2020 125075    37.0N   97.0W 2.0-4.0 AAAAA  Southern Plains            

 

Other areas near 103 degrees from the M 7.4 in the Kermadec Islands of June 18 seeing moderate quakes today included Northern Alaska  (M 3.0); Pakistan (M 2.7); Colombia and Nicaragua (M 5.3).

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in Hawaii.

NEIC reported this earthquake of M 3.6-4.2 in Hawaii  was felt with intensity II-IV in the area(s) of Hawaii at Pahala, Hawaii National Park, Naalehu, Volcano, Captain Cook, Pahoa, Mountain View, Hilo, Kurtistown and Holualoa.  The last earthquake of M>=4.3 in Hawaii occurred as an M 4.9 on November 11, 2019. The only other such event in Hawaii in the past year was an M 4.5 on August 12, 2019. That earthquake occurred in conjunction with the full moon of November 12, 2019. Like it, today's event was probably promoted by the new moon today. Forecast 124759 had expected today's activity in mid-June.

 

O: 21JUN2020 01:48:49  19.3N  155.4W mb=4.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 14JUN2020 124759    19.4N  155.1W 4.0-5.4 CAAAA  Hawaii area                

 

Some enhanced activity in northern India and Myanmar is anticipated with the new moon today but the strongest of this may be delayed as noted in the tidal seismic forecast with today's solar eclipse:

 

"The new moon will arrive June 21 at 06:41 UT. This involves an annular solar eclipse visible in the areas of Central Africa, Southern Asia, China and the Pacific with maximum at 06:41 UT. Maximum eclipse occurs over northern India, Nepal, Hindu Kush and Pakistan, an area which has seen enhanced seismicity in recent days including some unusual events at Gujarat, India and others. The eclipse will pass over Taiwan and the southern Ryukyu Islands as well as southern Iran and Pakistan and southern China. Most of these areas will probably see enhanced seismicity with this eclipse with a moderate chance of a major earthquake within a week of the eclipse in southern Asia. Longitudes which are sub-solar at this time are near 77 East and 103 West. These include areas of central Asia including Hindu Kush, India and Tajikistan in the east and the central and western U.S. and western Mexico in the west. These will experience the maximum tidal stresses and are most likely to see tidally triggered seismicity at this time. Many area, especially those where fluids are important modulators of seismicity, can experience tidal enhancement of seismicity, and several large earthquakes are likely in the next eight days. Tidal triggering often occurs near local solar midnight and noon when alignment is most linear." (June 19-20, 2020)

 

TONGA-FIJI-KERMADEC ISLAND ARC REMAINS ACTIVE

 

EARTHQUAKE SUMMARY FOR JUNE 19, 2020

 

The strongest seismicity in the world today occurred in the Tonga-Fiji-Kermadec

Islands arc. This included aftershocks in the Kermadec Islands of M 4.6 and 5.1;

an M 4.3 north of this but south of the Fiji Islands (M 4.3); an M 5.4 in Tonga near Samoa; an M 4.6 in Samoa and the strongest earthquake in the world today - an M 5.7 in Fiji. None of these events were reported felt in their epicentral areas. This continues activation of that region which appears to have begun with an unusual earthquake that shook Fiji on June 6 (M 5.8) and was followed by event of M 5.9 on June 10 and preceded by a similar event on June 3. When the event of June 6 occurred this summary noted:

 

"Despite what some may think, felt earthquakes in the Fiji Islands are rare. This group is situated midway between two active seismic zones - the Vanuatu Islands to the west and the Tonga Islands to the east and sees large deep focus earthquakes but little large-magnitude shallow focus activity.  ...  Several other moderate earthquakes also occurred today in the Southwest Pacific and the Fiji Islands group may be a catalyst for strong regional activation in the next several days." (June 7, 2020)

 

O: 19JUN2020 17:10:34  33.4S  178.6W mb=5.1  EMSC   SOUTH OF KERMADEC ISLANDS    

O: 19JUN2020 07:57:44  33.7S  178.0W mb=4.6  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 14JUN2020 124928    34.0S  180.0W 4.0-5.7 BABAA  So. Kermadec Islands       

 

O: 19JUN2020 17:54:40  25.6S  179.6E mb=4.3  EMSC   SOUTH OF FIJI ISLANDS        

P: 17JUN2020 124918    23.0S  179.0E 4.0-5.4 ACAAA  Tonga/Fiji                 

 

O: 20JUN2020 01:58:09  16.0S  173.1W Mw=5.4  EMSC   TONGA                        

P: 17JUN2020 124898    15.0S  173.0W 4.0-5.9 BAAAA  Samoa Islands              

 

O: 19JUN2020 10:07:55  17.5S  178.9W Mw=5.7  EMSC   FIJI REGION                  

P: 11JUN2020 124905    17.0S  179.0W 4.0-5.6 CAAAA  Tonga Islands              

P: 17JUN2020 124905    19.0S  178.0W 4.0-5.6 ABAAA  Tonga Islands              

 

O: 20JUN2020 04:44:31  16.3S  172.6W mb=4.6  EMSC   SAMOA ISLANDS REGION         

P: 13JUN2020 124904    16.0S  173.0W 4.0-5.8 CAAAA  Tonga Islands              

P: 17JUN2020 124898    15.0S  173.0W 4.0-5.9 BBAAA  Samoa Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the western Nevada aftershock zone. NEIC reported it was felt with maximum intensity in Nevada at Goldfield and II-III in Luning, Silverpeak, Hawthorne, Tonopah, Beatty, and Glenbrook and in California at Bishop, Lee Vining, and El Portal.

The mainshock was preceded by an M 4.3 and followed by an M 4.2 aftershock, both of which were lightly felt in the epicentral area. This epicenter is located at the fourth node (90 degrees) from the Kermadec epicenter and was probably enhanced by energy from that source. The M 4.9 is the strongest aftershock in this area in nearly a month since an M 5.3 on May 22, 2020. The mainshock of M 6.5 on May 15, 2020 was followed by an immediate aftershocks of M 5.1 23 minutes later and an M 5.0 on May 20, 2020 - the only other such aftershocks to date. Forecast 124770 had expected today's activity in the aftershock area in mid-June.

 

O: 20JUN2020 05:32:33  38.2N  117.8W ML=2.1  EMSC   NEVADA

O: 20JUN2020 03:55:26  38.2N  117.8W ML=2.9  EMSC   NEVADA

O: 20JUN2020 03:49:54  38.2N  117.8W ML=3.8  EMSC   NEVADA

O: 20JUN2020 03:49:54  38.2N  117.8W ML=4.2  ANSS   NEVADA

O: 20JUN2020 03:40:46  38.1N  118.2W ml=2.0  EMSC   NEVADA

O: 20JUN2020 03:16:55  38.2N  117.9W ML=2.1  EMSC   NEVADA

O: 20JUN2020 01:13:57  38.2N  117.8W ML=2.2  EMSC   NEVADA

O: 20JUN2020 00:06:51  38.2N  117.9W ml=2.2  EMSC   NEVADA

O: 19JUN2020 20:42:21  38.2N  117.8W ML=4.9  ANSS   NEVADA

O: 19JUN2020 16:07:08  38.1N  118.0W ML=3.0  EMSC   NEVADA

O: 19JUN2020 10:26:42  38.2N  117.7W Mw=4.1  EMSC   NEVADA

O: 19JUN2020 08:49:08  38.2N  117.9W ML=2.4  EMSC   NEVADA

O: 19JUN2020 07:40:58  38.2N  117.9W ML=2.4  EMSC   NEVADA

P: 14JUN2020 124770    38.1N  117.8W 2.5-4.4 CAAAA  California/Nevada area     

 

Areas near 103 and 144 degrees from the M 7.4 south of the Kermadec Islands of June 18 which are seismic are few, so far-field triggering from that event may be limited. Among the most likely to see significantly enhanced seismicity in the next week are Iceland and eastern Turkey at 144 degrees and the central U.S. including Oklahoma, Missouri, Wyoming, Montana, northern Alaska, areas near western Cuba, Colombia, the South Mid-Atlantic and Bangladesh, India, Myanmar and southern China near 103 degrees from the Kermadec event. Southern Spain and Morocco are near the antipode of the Kermadec Islands. One or more of these areas is likely to see a significant earthquake, especially with the new moon.

 

At least one area has shown signs of increased seismicity following the event in the Kermadec Islands. An M 4.1 in Iceland occurred 20 minutes after the event of M 7.4 in the Kermadec Islands. This is the time it takes for a reflected P-wave off the core-mantle boundary takes to travel the 144 degrees from  the Kermadec Islands to Iceland, and it is highly likely this event in  Iceland was a reaction to that seismic energy. A strong cusp of energy occurs at 144 degrees from large surface events and often is associated with significant increases in seismicity at this distance. More such activity is likely in coming days, including a possible volcanic event in Iceland. This summary had expected active seismicity in Iceland around June 17 within  about 100 km of this in forecast 124879.

 

O: 18JUN2020 13:09:20  65.8N   18.1W ML=4.1  EMSC   ICELAND                      

P: 17JUN2020 124879    65.0N   17.0W 3.0-5.0 AAAAA  Iceland area               

 

O: 20JUN2020 06:50:35  66.3N   18.5W ML=3.6  EMSC   ICELAND REGION               

P: 17JUN2020 124879    65.0N   17.0W 3.0-5.0 AAAAA  Iceland area               

 

The strongest earthquake in Alaska today was an M 4.0 in Northern Alaska.

This is part of an aftershock sequence in the area which began with an M 6.3 mainshock on August 12, 2018 and is located at 104 degrees from the Kermadec Islands epicenter. Today's is a significant regional event as the last aftershock in this series of M>4 was an M 4.3 on December 16, 2019. An M 5.3 hit the area with the eclipse of July 2, 2019 - the strongest aftershock since August, 2018 - and was part of the regional activation at that time. Forecast 124881 had expected today's event was likely within this aftershock zone around June 15.

 

O: 19JUN2020 16:58:59  69.6N  144.0W ML=4.0  EMSC   NORTHERN ALASKA              

P: 15JUN2020 124881    69.0N  144.0W 3.0-4.7 AAAAA  Northern Alaska            

 

O: 18JUN2020 12:49:53  33.4S  177.8W Mw=7.4  EMSC   SOUTH OF KERMADEC ISLANDS

 

UNPRECEDENTED MAJOR QUAKE OF M 7.4 SHAKES NORTHERN NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR JUNE 18, 2020

 

A major earthquake of M 7.4 shook most of northern New Zealand today. The epicenter was south of the Kermadec Islands and north of North Island.

This is the third strongest earthquake in the world in the past year following an M 7.7 South of Cuba on January 28, 2020 and an M 7.5 on March 25, 2020 in the northern Kuril Islands. The last event of significantly larger magnitude was an M 8.0 on May 26, 2019 in northern Peru. This is the strongest earthquake within about 300 km of this epicenter ever recorded. The epicenter is considerably southeast of most activity in this region and is highly unusual. At 10 km depth it may be an outer rise earthquake preceding a major quake to the northwest in coming days. NEIC reported maximum intensity VII in Whangamata, Waikota, North Island, New Zealand and IV in Napier, Bay of Plenty with II-III shaking ini the Bay of Blenty at Te Kaha, Opotiki, Whakatane, and in Napier, Hawkes Bay (IV), Gisborne, East Opus, Northland, Auckland, Taupo and Hastings. GEONET reported this earthquake was felt by 8907 people throughout both North and South Island with weak intensity by 3732 and light intensity by 3843 persons and moderate intensity by 1793. Strong shaking was felt by 124 with 9 feeling the quake with severe and six with extreme intensity. Aftershocks of M 5.5, 5.5, 5.4 ... were not reported felt. The earthquake occurred within about an hour of local solar midnight and was probably enhanced or promoted by tidal stresses associated with the upcoming new moon and solar eclipse. The tidal seismicity forecast for the coming new moon reads:

 

"The new moon will arrive June 21 at 06:41 UT. This will involve an annular solar eclipse visible in the areas of Central Africa, Southern Asia, China and the Pacific with maximum at 06:41 UT. Maximum eclipse occurs over northern India, Nepal, Hindu Kush and Pakistan, an area which has seen enhanced seismicity in recent days including some unusual events at Gujarat, India and others. The eclipse will pass over Taiwan and the southern Ryukyu Islands as well as southern Iran and Pakistan and southern China. Most of these areas will probably see enhanced seismicity with this eclipse with a moderate chance of a major earthquake within a week of the eclipse in southern Asia. Longitudes which are sub-solar at this time are near 77 East and 103 West. These include areas of central Asia including Hindu Kush, India and Tajikistan in the east and the central and western U.S. and western Mexico in the west. These will experience the maximum tidal stresses and are most likely to see tidally triggered seismicity at this time. Many area, especially those where fluids are important modulators of seismicity, can experience tidal enhancement of seismicity, and several large earthquakes are likely in the next eight days. Tidal triggering often occurs near local solar midnight and noon when alignment is most linear." (June 18-19, 2020)

 

When an unusual earthquake occurred west of North Island on June 13, this summary warned:

 

"The earthquake in South Island, New Zealand today was accompanied by an unusual earthquake west of North Island, New Zealand of M 4.7. The epicenter of this event is quite unusual. No earthquakes of M>=4.0 have occurred in this region northwest of New Zealand within about 300 km in at least 30 years. ..." (June 13, 2020)

 

and

 

"Unusual earthquakes in the New Zealand area have been known to just precede major global events. For example, on February 25, 2010 this summary noted an unusual earthquake off the coast of northern New Zealand which was nearly identical to a similar event on May 20, 1960 as possibly being a precursor to an upcoming major global event" (June 13, 202)

 

The M 7.4 south of the Kermadec Islands today is consistent with this expected pattern but is, itself, unusual seismicity in the New Zealand area. It may be precursory to an even stronger event in the region of southern Asia within days of the solar eclipse of June 21. The strongest tidal stresses with a solar eclipse occur near the path of totality. The path of that annular eclipse passes from southern Iran to Pakistan, Afghanistan, India, Nepal, Southern China, Taiwan and the Southern Ryukyu Islands of Japan. Some increases in seismicity may occur in these regions and near the antipode which crosses South America near northern Chile where an M 6.8 occurred on June 3, 2020. A strong aftershock is possible in that area at this time as well. All these areas have shown increased seismicity in the past week. This area is highly populated and a major event in the region could lead to great property damage and/or loss of life.

 

The last solar eclipse occurred on December 26, 2019 and was accompanied by a series of earthquakes in Puerto Rico which led to the M 6.5 on January 7, 2020, a deadly and disastrous event, unique in that area. The only other solar eclipse in the past year occurred on July 2, 2019. It was followed by the series of large earthquake in the Ridgecrest, California area on July 4 (M 6.7) and July 6 (M 7.1) as well as activation of the western U.S. and Canada. This summary had noted this at the time as:

 

"Solar eclipses have been known to be associated with major events in South America in the past. For example, a total solar eclipse of June 21, 2001 which began over South America was accompanied by  an M 8.4 in Peru on June 23, 2001, a quake which devastated the area and killed thousands. The coincidence of these two events was probably not happenstance. A further example is the Izmit, Turkey event of August 1999 which coincided with the most complete solar eclipse in Europe in centuries." (July 2, 2019)

 

Forecast 124928 had expected elevated seismicity in this region of the Kermadec Islands was likely in mid-June. These epicenters are near the 103 distance from the landfall of Tropical Cyclone Amphan which made landfall in Bangladesh on May 25 and may have been promoted by energy from that source as noted at the time in this summary:

 

"A moderately strong earthquake of M 5.8 in the Northern Kermadec Islands of New Zealand today completed the set of such events in the area which followed landfall of TC Amphan last week." (May 29, 2020)

 

and

 

"A series of moderate earthquakes continued today in the Southwestern Pacific.

These included an M 5.9 in Tonga, an M 6.1 in Vanuatu and several moderate aftershocks; events in Fiji (M 4.3, 4.5) and in north and South Island, New Zealand of M 4.0 and 4.5. This activity is located at 101-104 degrees from the landfall of TC Amphan in Bangladesh late last week." (May 28-29, 2020)

 

The 103 degree distance from the Kermadec Islands passes through Myanmar and northern India as well as in the central U.S. in Oklahoma. These areas may see far-field triggering in coming days.

 

O: 19JUN2020 05:20:07  33.3S  177.6W mb=4.5  EMSC   SOUTH OF KERMADEC ISLANDS

O: 18JUN2020 15:06:15  33.3S  178.0W mb=5.5  EMSC   SOUTH OF KERMADEC ISLANDS

O: 18JUN2020 12:49:54  33.4S  177.5W ML=7.4  GEONET reported felt by 8907 people

O: 18JUN2020 12:49:53  33.4S  177.8W Mw=7.4  EMSC   SOUTH OF KERMADEC ISLANDS

O: 18JUN2020 16:11:40  33.4S  177.9W mb=5.5  EMSC   SOUTH OF KERMADEC ISLANDS

O: 18JUN2020 19:34:15  33.4S  178.4W mb=5.2  EMSC   SOUTH OF KERMADEC ISLANDS

O: 18JUN2020 19:11:52  33.5S  178.1W mb=5.4  EMSC   SOUTH OF KERMADEC ISLANDS

O: 19JUN2020 00:38:51  33.6S  178.6W Mw=5.4  EMSC   SOUTH OF KERMADEC ISLANDS

O: 18JUN2020 14:52:48  33.1S  177.8W mb=5.0  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 14JUN2020 124928    34.0S  180.0W 4.0-5.7 BABAA  So. Kermadec Islands        

 

The earthquake south of the Kermadec Islands today appears to have reignited the  swarm in the southern Ryukyu Islands which had largely dissipated yesterday.

The largest of today's events, of M 5.3, 5.2 and 5.0 were reported felt in Okinawa and Taiwan. This epicenter is at the end of the path of totality for the June 21 Solar Eclipse and could see increased tidal triggering in the next several days. Forecast 124765 had expected moderate seismicity within about 100 km of these epicenters was likely in mid-June.

 

O: 18JUN2020 16:43:18  24.9N  123.3E Mw=5.3  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 19JUN2020 07:30:30  24.9N  123.4E ML=4.6  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 19JUN2020 00:26:35  24.9N  123.4E Mw=5.2  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 18JUN2020 16:42:14  24.8N  123.3E mb=5.0  EMSC   SOUTHWESTERN RYUKYU ISL., JAPA

P: 14JUN2020 124765    24.0N  123.0E 4.0-5.6 BAAAA  Taiwan                     

 

O: 18JUN2020 22:25:11  24.6N  125.2E mb=4.7  EMSC   SOUTHWESTERN RYUKYU ISL., JAPA

P: 19JUN2020 124763    25.0N  122.0E 4.0-5.4 AABAA  Ryukyu Islands             

 

The largest earthquakes in the U.S. or Canada today were an M 5.2 and 5.1 in the western Andreanof Islands, Alaska. They were not reported felt in this remote area. The last earthquake in the western Andreanof Islands to exceed M 5.1 occurred on March 2, 2020 with M 5.7. These are probably aftershocks of an M 6.1 that shook the area on January 26, 2020. Forecast 124854 had expected today's activity in the Andreanof Islands within about 50 km of these epicenters was likely in mid-June.

 

O: 19JUN2020 02:59:27  51.2N  179.1W Mw=5.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 19JUN2020 03:08:31  51.3N  179.2W Mw=5.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 14JUN2020 124854    51.0N  179.9W 3.5-5.1 BAAAA  Andreanoff Isls, Aleutians 

 

The strongest felt earthquake in the U.S. today was an M 4.2 in the Kenai Peninsula or Alaska. NEIC reported it was felt with maximum intensity IV in Eagle River and Anchorage and III in Girdwood, Moose Pass, and Fort Richardson. This is the largest earthquake in the Kenai Peninsula of Alaska since a similar M 4.2 on February 27, 2020. No other such events have occurred in the Kenai Peninsula in the past six months. Forecast 124876 had expected today's event was likely around June 16.

 

O: 18JUN2020 09:42:00  60.4N  151.8W ML=3.1  EMSC   KENAI PENINSULA, ALASKA      

O: 18JUN2020 20:38:42  60.9N  149.1W mb=4.3  EMSC   KENAI PENINSULA, ALASKA      

P: 16JUN2020 124876    60.5N  151.5W 3.2-5.0 AAAAA  Central Alaska             

 

 

CENTRAL ASIA; WESTERN U.S. CONTINUE ENHANCED SEISMICITY

 

EARTHQUAKE SUMMARY FOR JUNE 17, 2020

 

Global seismicity returned to relatively quiet levels today with no events of

M>=5. Enhanced seismicity, however did continue in central Asia with two events of M 4.2 in Hindu Kush and an M 4.7 in Pakistan and in the western U.S. where earthquakes of M 4.5 occurred off the northern California coast; an M 3.4 was widely felt in San Francisco, California and an aftershock of M 4.3 in southern Idaho continued active conditions in that area. These quiet conditons, however are not expected to continue for long. In addition to the new moon on June 21, an asteroid of moderate size will make a close pass on June 20, and there is still the outstanding matter of what the meaning of the unusual earthquake west of New Zealand of June 13 was - a large quake is still considered possible in that region in the next several days. 

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 off the coast of northern California and Oregon. NEIC reported it was felt with intensity I-II in Brookings and Salem, Oregon and in Eureka, Orland and Santa Clara, California. No damage was reported with this earthquake. The last earthquake within about 100 km of this epicenter with M>=4.5 occurred on October 28, 2019 more than half a year ago with M 5.2. Forecast 124840 had expected today's event in this region was likely around June 19.

 

Previous issues summary had expected the area off the northwest coast of the U.S. could show enhanced seismicity at this time as:

 

"The enhanced seismicity on Ocean Ridges which saw the last in the Southern Mid-Atlantic Ridge yesterday of M 6.0 continued today with and M 5.8 in the Prince Edward Island region of the South Indian Ocean. It was not reported felt in this remote area. The antipodal area of this epicenter off the northwestern coast of the U.S. west of California an Oregon. This event is a bit small to significantly enhance seismicity in this area but some minor enhancement in the area is possible over the next several days. Most of the activity in this area off the coast of California and Oregon occurs well to the east of the antipode of today's Prince Edward Islands event." (June 12, 16, 2020)

 

O: 17JUN2020 21:08:09  41.8N  126.0W Mw=4.5  EMSC   OFF COAST OF NORTHERN CALIFORN

P: 19JUN2020 124840    41.8N  126.9W 2.5-4.6 AAAAA  Off Coast of No. Calif     

 

An earthquake of M 3.4 was widely felt in the San Francisco Bay area of California today. NEIC reported maximum intensity III in Milpitas, San Jose, Mount Hamilton, and other communities. This is the strongest earthquake in the San Francisco Bay area since an M 3.9 to the south of today's epicenter on January 2, 2020 nearly half a year ago. Forecast 124774 had expected area would be active around June 19. Today's event may have been promoted by tidal stresses as it occurred within a couple of hours of local solar noon.

 

O: 17JUN2020 17:35:02  37.4N  121.8W Mw=3.4  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 19JUN2020 124774    37.8N  122.6W 2.5-4.4 AAAAA  Central California         

 

The aftershock zone in Southern Idaho continued at enhanced levels today. The strongest earthquake of the day was an M 4.3. This follows an M 4.7 in this zone on June 13. At the time this summary had noted:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.2-4.7 in the Southern Idaho aftershock zone of the March 31, 2020 M 6.5. NEIC reported maximum intensity for this event was IV at Stanley, Idaho with II-III shaking in Idaho at Lowman, Garden Valley, Cascade, Ketchum, Fairfield, Hailey, May, Garden City and Boise. This is the first aftershock in southern Idaho of M 4.7 or greater since the mainshock of M 6.5 on March 31, 2020 and the third largest event in the area in the past 30 years - after a similar M 4.7 on January 28, 1995." (June 13, 2020)

 

Forecast 124830 had expected today's event was likely around June 17.

 

NEIC reported this earthquake of M 3.9-4.0 in Southern Idaho  was felt with intensity II-III in the area(s) of Southern Idaho at Lowman, Ketchum, Horseshoe Bend, Garden City, Boise and Meridian.

 

O: 17JUN2020 07:59:39  44.4N  115.2W Ml=4.3  EMSC   SOUTHERN IDAHO

O: 17JUN2020 09:04:48  44.4N  115.2W Ml=2.5  EMSC   SOUTHERN IDAHO

O: 17JUN2020 09:28:56  44.4N  115.2W Ml=2.2  EMSC   SOUTHERN IDAHO

O: 17JUN2020 12:03:24  44.4N  115.2W Ml=2.5  EMSC   SOUTHERN IDAHO

O: 18JUN2020 06:02:26  44.4N  115.2W ML=2.8  EMSC   SOUTHERN IDAHO

O: 17JUN2020 07:19:12  44.5N  115.3W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 18JUN2020 02:31:53  44.2N  115.1W ML=2.7  EMSC   SOUTHERN IDAHO               

P: 17JUN2020 124830    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

An M 3.7-4.0 was widely felt in southern Puerto Rico today. NEIC reported it was felt with IV in Ponce and Guanica and II-III in San German, Cabo Rojo, Mayaguez, Arecibo, Hatillo, Anasco, Bayamon and Carolina, Puerto Rico. This is an aftershock of the M 6.5 of January 7, 2020. The last earthquake in this aftershock zone with M>=4 occurred June 13, 2020. Forecast 124754 had expected this activity around June 16.

 

O: 18JUN2020 06:38:33  17.9N   66.8W ML=4.0  EMSC   PUERTO RICO REGION

O: 17JUN2020 18:36:41  18.0N   67.0W Md=3.0  EMSC   PUERTO RICO REGION

O: 18JUN2020 02:20:38  19.1N   67.2W ML=3.2  EMSC   PUERTO RICO REGION

O: 18JUN2020 00:50:14  17.9N   66.9W ML=3.1  EMSC   PUERTO RICO                  

O: 18JUN2020 06:18:23  17.9N   67.1W ML=3.2  EMSC   PUERTO RICO REGION           

P: 16JUN2020 124754    18.0N   66.0W 3.4-5.1 AAAAA  Puerto Rico                

 

RED SEA SEES UNUSUAL M 5.4

 

EARTHQUAKE SUMMARY FOR JUNE 16, 2020

 

The strongest earthquake felt in the world today was an M 5.4 in the northern Red Sea. NEIC reported it was felt with maximum intensity II-III in Egypt at Hurghada, El Tur, South Sainai, Asyut, and Tockh and in Tabuk, Saudi Arabia, and Beirut, Lebanon. While the Red Sea is an active seismic zone, part of the spreading of the east African Rift Valley, earthquakes of M>=5.4 are not common in this area. The last such event in the Red Sea within about 250 km of today's epicenter occurred on November 23, 1995 nearly 25 years ago. This was an aftershock of an M 7.2 on November 22, 1995 and occurred about 150 km north of today's epicenter. This earthquake is at 101 degrees from the M 7.7 south of Cuba of January 24 and may have been promoted by energy from that source.

 

O: 16JUN2020 14:30:27  27.3N   34.7E Mw=5.4  EMSC   RED SEA                      

 

The strongest earthquake today was an M 5.6 in the Tonga Islands. It was lightly felt in the epicentral area. This is the largest earthquake within about 250 km of this epicenter in Tonga since an M 5.7 a month ago on May 15 and three months ago as an M 6.0 on March 17, 2020 - the only such events in the past half year.

Forecast 124904 had expected today's event to the east around June 13.

 

O: 17JUN2020 06:24:19  16.2S  175.0W Mw=5.6  EMSC   TONGA                        

P: 13JUN2020 124904    16.0S  173.0W 4.0-5.8 BABAA  Tonga Islands              

 

Active conditions continued in central Asia today following three days of enhanced seismicity in that region. Events of M 4.5 in Pakistan and an M 5.0 in Hindu Kush, Afghanistan were reported by NEIC to have been felt. The event in Hindu Kush with intensity II in Kabul, Afghanistan. The epicenter is at 70 East longitude and was probably promoted by high tidal stresses from the previous full and the upcoming new moon as noted in previous summaries as:

 

"The new moon will arrive June 21 at 06:41 UT. Longitudes which are sub-solar at this time are near 77 East and 103 West. These include areas of central Asia including Hindu Kush, India and Tajikistan in the east and the central and western U.S. and western Mexico in the west. These will experience the maximum tidal stresses and are most likely to see tidally triggered seismicity at this time. Many area, especially those where fluids are important modulators of seismicity, can experience tidal enhancement of seismicity, and several large earthquakes are likely in the next eight days. Tidal triggering often occurs near local solar midnight and noon when alignment is most linear." (June 15-16, 2020)

 

and

 

"The full moon will arrive on June 5 at 19:12 UT. Areas which are sub-solar at this time are near 110 West and those anti-solar at 70 East longitude. These include western U.S. in the west and Central Asia in the East. Some enhanced seismicity in these areas is likely during the next five days." (June 1-2, 2020)

 

The M 5.0 in Afghanistan is the first of M>=5.0 in the Hindu Kush area since an M 6.1 on December 20, 2019, six months ago. It followed the M 5.7 in Tajikistan about 200 km to the northeast by about 8 hours and may have been triggered by regional stresses from that event.

 

The earthquake of M 4.7 in southwestern Pakistan was the strongest within about 200 km of that epicenter since an M 4.7 on May 15, 2020.   It may have been promoted by the M 5.1-5.5 event in Gujarat, India two days ago. That event and several moderate quakes in southern Iran may have helped redistribute stress in the area leading to today's Pakistan quake.

 

O: 17JUN2020 06:58:19  25.2N   63.3E mb=4.7  EMSC   SOUTHWESTERN PAKISTAN        

P: 10JUN2020 124764    29.0N   58.0E 3.5-5.1 CCCAA  So. Iran/Persian Gulf      

P: 14JUN2020 124760    24.0N   70.0E 3.5-4.9 BBCAA  India                       

 

An M 4.5 was also felt on the Vietnam-Laos-China border today. NEIC reported it was felt with intensity II in Svay Rieng, Cambodia. This epicenter is near the landfall of TS Nuri several days ago. That landfall was followed by active conditions throughout much of southeast Asia but this is the first moderate event in the immediate landfall area since it occurred. The associated forecast with TS Nuri had read:

 

 

"The activity in Turkey and India may have been enhanced by landfall of Tropical Storm Nuri in southeastern China about the same time. A series of moderate earthquakes in southern Ryukyu Islands off eastern Taiwan also accompanied this landfall. This had been noted in the previous summary as: " (June 14-15, 2020)

 

    

"TS Nuri  (02W) continued today east of the Philippines with winds up to 35 kts. No major changes to seismicity in the region are anticipated with this storm at this time but large earthquakes in Taiwan (M 5.5) and the Ryukyu Islands (M 6.7) may have been promoted by stresses from TS Nuri today." (June 13-14, 2020)

 

O: 16JUN2020 11:15:47  19.0N   94.3E mb=4.8  EMSC   MYANMAR                      

P: 12JUN2020 124734    19.0N   96.0E 4.0-5.6 BABAA  Andaman Islands            

 

 

Several antipodal pairs were completed today. An earthquake northwest of Spain with M 4.7 occurred at 43N 14W in the Atlantic Ocean. This is antipodal within about one degree to the M 5.3-5.5 in South Island, New Zealand of June 12 at 44S 167E. Epicenters are antipodal when the latitudes are the same and in opposite hemispheres and the longitudes are in opposite hemispheres and numerically add to 180 as is the case here.

 

The last earthquake in the North Atlantic within about 250 km of today's epicenter with M>=4.2 occurred on April 29, 2017 with M 4.2. The last with larger magnitude was an M 4.5 on April 3, 2012. The largest event  in this area in the past 30 years was an M 4.9 more than 12 years ago on January 4, 2008.

The last earthquake within about 200 km of the June 12 epicenter in South Island with M>=5.3 occurred on August 12, 2019 with M 5.4 and prior to that as an M 5.4 on June 7, 2016.  It is likely this epicenter was triggered by antipodal focusing of seismic energy from the M 5.3 in South Island, New Zealand of June 13.

 

At the time of the South Island event another occurred to the north. This was also accompanied by antipodal activity in the North Atlantic as noted in this summary at the time:

 

"Near the antipode of the event west of North Island an M 4.9 occurred later in the day off the west coast of Spain. This is within about 300 km of the exact antipode of the New Zealand event (39N 13W). The combination of these unusual near-antipodal quake suggests something may be brewing in global seismicity. ... Today's earthquake off Spain is the largest within about 250 km of that epicenter since an M 5.5 on December 17, 2009 more than 10 year ago." (June 13, 2020)

 

The second antipodal pair involving the North Atlantic off Spain suggests this may be an area where a stronger quake may occur in the near-term. Great earthquakes are not unknown to occur in this region. Two such events hit the area on February 28, 1969, and May 26, 1975 with M 8.0 and M 8.1 A larger event was recorded on November 25, 1941. The great earthquake of November 1, 1755  inspired the author Voltaire to write the satire "Candide" and  triggered a tsunami which destroyed Lisbon and led to the decline of Portugal as a world power occurred in this area. The tsunami was one of the only such events which reached North America reaching wave heights up to 20 feet in the Caribbean. All of these events, however were located well to the south of the current activity and there seems little danger of such an event in today's epicentral area. The largest quake recorded near today's epicenter was an M 6.0 on March 8, 1906, a month before the great San Francisco, California earthquake of April, 1906.

 

The earthquake today in the North Atlantic is at 101 degrees from the M 6.7 in the northern Ryukyu Islands of June 13 and may have been promoted by concentrated energy from that source.

 

O: 17JUN2020 04:59:23  43.3N   14.4W mb=4.2  EMSC   NORTH ATLANTIC OCEAN         

 

O: 12JUN2020 07:29:17  44.4S  167.8E ML=5.3  GEONET reported 1737 people felt this quake

 

A series of moderate earthquakes also hit the area of Sumbawa, Indonesia on June 13 at 9S 118E. These were followed today by an M 4.4 today in the Gulf of Paria, Trinidad and Tobago within about one degree of exactly antipodal.  NEIC reported this earthquake of M 4.4 in Trinidad and Tobago  was felt with intensity II-III in the area(s) of Trinidad and Tobago at Scarborough.  The event of M 5.0 in Sumbawa was the strongest in that area in the past three months. Quakes of M 5.1 and 5.2 hit the area on March 15, and January 6, 2020, the only such activity in the region in the past half year. The last event of M>=4.4 in the Gulf of Paria, Venezuela was an M 4.7 on March 16. The only other such event in the past six months in this area was an M 4.8 on January 28, 2020. Antipodal epicenters often occur during global geomagnetic disturbance or when one event is very large. The  cause of today's antipodal events is under investigation.

 

 

O: 16JUN2020 09:56:44  10.1N   62.0W mb=4.4  EMSC   GULF OF PARIA, TRINIDAD-TOBAGO

 

O: 13JUN2020 09:15:46   8.9S  117.8E Mw 5.0  EMSC   SUMBAWA REGION, INDONESIA    

O: 13JUN2020 12:12:22   9.0S  117.9E ML 4.7  EMSC   SUMBAWA REGION, INDONESIA    

 

The strongest earthquake in California today was an M 3.8 in the northern Ridgecrest, California aftershock zone. Forecast 124805 had expected today's activity within about 10 km was likely around June 18. The area has seen a series of events around M 3.8 in recent months. The last of these was an M 4.2 on June 4 and an M 3.8 on May 24, 2020. The only other such event in the northern aftershock zone in the past half year was an M 3.8 on March 8, 2020. An M 5.5 aftershock about 50 km southeast of this occurred on June 4, 2020 and may have led to the current spike in regional activity.

 

O: 16JUN2020 09:55:16  35.9N  117.7W Ml=2.4  EMSC   CENTRAL CALIFORNIA

O: 16JUN2020 05:58:22  36.0N  117.8W Mw=3.8  EMSC   CENTRAL CALIFORNIA           

P: 18JUN2020 124805    35.9N  117.7W 2.5-4.6 AAAAA  So. California             

 

MODERATELY STRONG QUAKE SHAKES NORTHERN INDIA; TAJIKISTAN

 

EARTHQUAKE SUMMARY FOR JUNE 15, 2020

 

The strongest earthquake in the world - an earthquake of M 5.7-5.8 - occurred today near the northern Indian border in Tajikistan. Indian authorities reported this intermediate focus event was felt in Kashmir and Jammu with moderate intensity in the Kashmir Valley at Srinagar, Kishtwar and Doda districts and in Jammu. A light foreshock of M 3.6 also jolted the area today. NEIC reported intensity IV in India at Srinagar and V in Len, Jammu and Kashmir and IV in Rawalpindi, Pakistan. The tremor from the quake was also felt with intensity II-III in Tajikistan at Khorug Goro-Badakshat, Obigarm, Dushanbe; Kabul, Afghanista nd Islamabad, Pakistan. At 72 East longitude, and like the Gujarat, India earthquake yesterday, this epicenter is located near the longitude of maximum tidal stress with the previous full moon and the upcoming new moon as noted in this summary:

 

"The new moon will arrive June 21 at 06:41 UT. Longitudes which are sub-solar at this time are near 77 East and 103 West. These include areas of central Asia including Hindu Kush, India and Tajikistan in the east and the central and western U.S. and western Mexico in the west. These will experience the maximum tidal stresses and are most likely to see tidally triggered seismicity at this time. Many area, especially those where fluids are important modulators of seismicity, can experience tidal enhancement of seismicity, and several large earthquakes are likely in the next eight days. Tidal triggering often occurs near local solar midnight and noon when alignment is most linear." (June 15-16, 2020)

 

and

 

"The full moon will arrive on June 5 at 19:12 UT. Areas which are sub-solar at this time are near 110 West and those anti-solar at 70 East longitude. These include western U.S. in the west and Central Asia in the East. Some enhanced seismicity in these areas is likely during the next five days." (June 1-2, 2020)

 

This event may also be related to landfall of Tropical Storm Nuri to the east in southern China two days ago as noted in previous issues of this summary:

 

 

"The activity in Turkey and India may have been enhanced by landfall of Tropical Storm Nuri in southeastern China about the same time. A series of moderate earthquakes in southern Ryukyu Islands off eastern Taiwan also accompanied this landfall. This had been noted in the previous summary as: " (June 14-15, 2020)

 

    

"TS Nuri  (02W) continued today east of the Philippines with winds up to 35 kts. No major changes to seismicity in the region are anticipated with this storm at this time but large earthquakes in Taiwan (M 5.5) and the Ryukyu Islands (M 6.7) have have been promoted by stresses from TS Nuri today." (June 13-14, 2020)

 

The last earthquake in Tajikistan within about 200 km of this epicenter with M>=5.7 occurred on May 5, 2017 with M 6.0. A similar event of M 6.2 struck the region about 200 km to the southwest of this on May 9, 2018.  Forecast 124782 had expected this event about 100 km to the north was likely around June 17. This epicenter is at 144 degrees from the M 6.8 in Northern Chile of June 3 and, like the Gujarat, India quake yesterday, was probably promoted by energy from that source.

It is also at the sixth node (60 degrees) from the last major global earthquake - the M 7.6 of March 25, 2020 in the northern Kuril Islands.

 

O: 16JUN2020 01:30:46  37.9N   72.4E Mw=5.7  EMSC   TAJIKISTAN                   

O: 16JUN2020 01:30:46  37.7N   72.3E Mw=5.7  CENC   TAJIKISTAN                    

P: 17JUN2020 124782    39.0N   72.0E 3.8-5.2 ABAAA  Hindu Kush/Pakistan        

 

Aftershocks also continued today in the Gujarat area of India following the M 5.1-5.5 there yesterday. NEIC reported this earthquake of M 3.9 in Gujarat, India  was felt with intensity II-III in the area(s) of Gujarat, India at Bhachau, Chotila, Sarkhej, Ghatiodiya, and Anand. A great earthquake occurred near this epicenter and Cutch, India exactly 201 years ago on June 16, 1819, one of the largest ever recorded in India (M 8.3+). For a description see the HISTORY section of this report.

 

O: 15JUN2020 07:27:34  22.9N   70.2E mb=3.9  EMSC   GUJARAT, INDIA               

O: 15JUN2020 10:26:03  23.4N   70.3E ML=3.5  EMSC   GUJARAT, INDIA               

P: 14JUN2020 124760    24.0N   70.0E 3.5-4.9 AAAAA  India                      

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the Fox Islands, Alaska. NEIC reported it was felt with intensity IV in Unalaska, Alaska. An aftershock of M 4.1 also shook Unalaska with intensity III. The last earthquake within about 200 km of this epicenter with N>=4.5 was an M 4.8 on March 30, 2020 and prior to that an M 4.8 on September 27, 2019. Forecast 124860 had expected today's activity within about 25 km of the epicenter was likely around June 19. This activity, like that in Gujarat, India is at the seventh node (51-52 degrees) from the M 6.7 in the northern Ryukyu Islands of June 13, and may have been promoted by energy from that source.

 

O: 16JUN2020 00:34:15  53.9N  166.7W mb=4.1  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 15JUN2020 21:16:49  54.0N  166.8W mb=4.5  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 16JUN2020 02:38:51  53.8N  166.7W ML=3.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 19JUN2020 124860    53.7N  167.0W 3.5-5.0 BAAAA  Fox Islands, Aleutians     

 

A moderate M 4.1 off the coast of Oregon was also felt today. This event may be related to a near-antipodal quake of M 5.8 in the Prince Edward Islands in the

South Indian Ocean several days ago. At the time this summary had noted in this regard:

 

 

"The enhanced seismicity on Ocean Ridges which saw the last in the Southern Mid-Atlantic Ridge yesterday of M 6.0 continued today with and M 5.8 in the Prince Edward Island region of the South Indian Ocean. It was not reported felt in this remote area. The antipodal area of this epicenter off the northwestern coast of the U.S. west of California an Oregon. This event is a bit small to significantly enhance seismicity in this area but some minor enhancement in the area is possible over the next several days. Most of the activity in this area off the coast of California and Oregon occurs well to the east of the antipode of today's Prince Edward Islands event." (June 12, 2020)

 

Today's earthquake of M 4.1 is the first moderate quake in the area within about

100 km of this epicenter since an M 4.7 on February 8, 2020 and an M 4.6 on October 21, 2019.  NEIC reported today's earthquake of M 4.1 off the coast of Oregon  was felt with intensity II-III in the area(s) near the coast of Oregon at Bandon, Roseburg, and Tangent, Oregon. Forecast 124840 had expected this activity in this region was likely around June 12.

 

O: 15JUN2020 11:13:37  43.4N  126.6W mb=4.1  EMSC   OFF COAST OF OREGON          

P: 12JUN2020 124840    42.5N  126.8W 3.0-4.9 BAAAA  Off Coast of Oregon        

 

The strongest earthquake in California today was an M 3.8 in the Ridgecrest aftershock zone. NEIC reported this earthquake of M 3.8 in the Ridgecrest, California aftershock zone  was felt with intensity II-III in the area(s) of the Ridgecrest, California aftershock zone at Ridgecrest and Lake Isabella. Forecast 124769 had expected this activity within about 25 km around June 18.

 

O: 16JUN2020 05:58:22  36.0N  117.8W ML=3.8  EMSC   CENTRAL CALIFORNIA            

P: 18JUN2020 124769    36.2N  117.9W 2.5-4.5 AAAAA  California/Nevada area     

 

Moderate aftershocks continued to shake eastern Turkey today after the M 5.9 there yesterday. The strongest of today's regional events was an M 5.5.  This aftershock of M 5.4-5.5 was reported with maximum intensity VII in Yedisu, Bingol, Turkey and IV in Erzurum and III in Baluma Ajaria, Georgia. Forecast 124811 had expected today's event within about 50 km of this epicenter was likely around June 13.

 

O: 15JUN2020 16:52:36  39.4N   40.7E ML=3.7  EMSC   EASTERN TURKEY

O: 15JUN2020 07:32:37  39.4N   40.8E ML=3.8  EMSC   EASTERN TURKEY

O: 15JUN2020 06:51:29  39.4N   40.8E Mw=5.5  EMSC   EASTERN TURKEY

O: 15JUN2020 07:14:35  39.3N   40.7E ML=3.7  EMSC   EASTERN TURKEY                

P: 13JUN2020 124811    39.0N   41.0E 3.5-4.9 AAAAA  Turkey                     

 

This activation of the major swarm of moderate earthquakes in the southwestern Ryukyu Islands northeast of Taiwan also continued today. JMA reported today's earthquake of M 5.2-5.4 in the southern Ryukyu Islands was felt with intensity II-III in the area(s) of the southern Ryukyu Islands at Okinawa. If a large quake were to hit the area shortly this would be the most likely area. The largest of these lightly felt earthquakes was an M 5.2-5.4 but at least 10 others of M>=4.4 were also recorded. Yesterday's event of M 6.0 in Taiwan occurred about 150 km southwest of these today so they are not classical  aftershocks of that event, but stress redistribution may have contributed to the timing of this swarm. The last earthquake of M>=5.2 within about 100 km of this epicenter was an M 5.7 on October 23, 2018. Forecast 124765 had expected today's activity in this area was likely around June 14. This activity is at the fifth node (72 degrees) from Northeastern Turkey and may have been enhanced by energy from that source.

 

O: 15JUN2020 09:37:46  24.8N  123.2E mb=4.6  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 15:47:18  24.8N  123.2E mb=4.7  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 13:30:58  24.8N  123.3E mb=4.5  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 09:18:03  24.8N  123.3E mb=4.7  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 07:24:58  24.9N  123.2E mb=4.6  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 13:47:15  24.9N  123.3E Mw=5.2  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 13:47:15  24.9N  123.3E Mw=5.4  JMA    SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 15:24:39  24.9N  123.3E mb=4.5  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 17:19:29  24.9N  123.3E mb=4.7  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 12:08:32  24.9N  123.4E mb=4.4  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 11:03:36  24.8N  123.0E mb=4.5  EMSC   SOUTHWESTERN RYUKYU ISL., JAPA

P: 14JUN2020 124765    24.0N  123.0E 4.0-5.6 AAAAA  Taiwan                     

 

STRONG QUAKE DEADLY IN NORTHEAST TURKEY; MODERATE QUAKE SHAKES INDIA

 

EARTHQUAKE SUMMARY FOR JUNE 14, 2020

 

A strong  M 5.9 was widely felt in northeastern Turkey today. NEIC reported damage with intensity VIII in Yedisu, Bingol, Turkey with V in Karliova, Erzurum, IV in Uzumlu, Erzincan and III in Giresun and III in Batum Ajaria, Georgia. It was felt in Turkey, Georgia and Armenia. An aftershock of M 5.4-5.5 was reported with maximum intensity VII in Yedisu, Bingol, Turkey and IV in Erzurum and III in Baluma Ajaria, Georgia. A large number of aftershocks were also recorded, some felt with moderate intensity. News sources indicate this earthquake killed one and injured at least 18 persons. The death occurred to a village guard when two observation towers collapsed in Bingol. Seven were rescued from the wreckage. None of the 18 injured were critical. The last earthquake of M>=5.9 in eastern Turkey within about 250 km of today's epicenter occurred on January 24, 2020 about 200 km southwest of this epicenter with M 6.7. The last within about 100 km of the epicenter occurred as an M 6.4 on May 1, 2003.  Forecast 124811 had expected today's event within about 50 km of this epicenter was likely around June 13.

 

The Turkish quake is at 120 degrees (node 3) from the M 6.8 in northern Chile of June 3, 2020 and may

 

O: 14JUN2020 14:34:48  39.4N   40.7E mb=4.5  EMSC   EASTERN TURKEY

O: 15JUN2020 06:51:29  39.4N   40.8E Mw=5.5  EMSC   EASTERN TURKEY

O: 14JUN2020 15:09:15  39.4N   40.8E mb=4.5  EMSC   EASTERN TURKEY

O: 14JUN2020 14:24:28  39.4N   40.7E Mw=5.9  EMSC   EASTERN TURKEY               

P: 13JUN2020 124811    39.0N   41.0E 3.5-4.9 AAAAA  Turkey                     

 

An M 5.1-5.5 also shook regions of Guharat, India today. NEIC reported it was felt with intensity V in Gugarat at Bhachau, Anjar, and Shuj; IV in Gandhi Dham, Dandia, Maliya, Barwala, Morvi, Mundra and Tankara. The India Meterological Department (IMD) reported the quake at M 5.3-5.5 and that it was felt in Kutch, Rajkot, Ahmedabad, Patan and other areas. People rushed from their homes and collected on the streets. No major damages or loss of life accompanied this earthquake.  The earthquake in India occurred 18 minutes and 40 seconds after the M 5.9 in Turkey at 32 degrees from that epicenter. Surface and S-type body waves from Turkey would have been present in India at the time of this earthquake having arrived 1-2 minutes before and may have helped trigger it.

 

The activity in Turkey and India may have been enhanced by landfall of Tropical Storm Nuri in southeastern China about the same time. A series of moderate earthquakes in southern Ryukyu Islands off eastern Taiwan also accompanied this landfall. This had been noted in the previous summary as:

 

    

"TS Nuri  (02W) continued today east of the Philippines with winds up to 35 kts. No major changes to seismicity in the region are anticipated with this storm at this time but large earthquakes in Taiwan (M 5.5) and the Ryukyu Islands (M 6.7) may have been promoted by stresses from TS Nuri today." (June 13-14, 2020)

 

Other factors which probably promoted the occurrence of today's event in Gujarat, India included a tropical cyclone which hit the region last week as noted in this summary at the time:

 

 

"A light to moderate earthquake also accompanied landfall of a tropical cyclone in western Peninsular India today near Mumbai, India. Previous issues of this summary had expected moderate seismic enhancement with this storm as:

 

"A tropical cyclone may be forming west of Peninsular India.  Landfall occurred today near Mumbai, India may enhance seismicity in the regions of Pakistan, Iran and Afghanistan and India." (June 5, 2020)

 

The longitude of the Gujarat event is also at the maximum tidal stress longitude of the previous full moon. Tidal stresses may have helped enhance today's event as noted in previous issues of this summary:

 

"The full moon will arrive on June 5 at 19:12 UT. Areas which are sub-solar at this time are near 110 West and those anti-solar at 70 East longitude. These include western U.S. in the west and Central Asia in the East. Some enhanced seismicity in these areas is likely during the next five days." (June 1-2, 2020)

 

The last earthquake of M>=5.1 in the region of Gujarat, India within about 200 km was an M 5.5 on April 6, 2006. These are aftershocks of the M 7.6 of January 26, 2001 which killed thousands and did much damage in the area. Forecast 124760 had expected today's activity was likely within about 100 km of this epicenter around June 14.

 

A brief description of the 2001 event was in this summary on January 26, 2020 and read:

 

"At least 20,000 people killed, more than 166,000 injured and nearly 350,000 building destroyed and an additional 800,000 damaged in the Bhuj-Gujarat area. At least 18 killed in southern Pakistan. Felt throughout southern Pakistan and northern India. Sandblows, liquefaction, visible surface waves and water phenomena were commonly reports." (January 26, 2020) 

 

The Gujarat quake is at 143 degrees from the M 6.8 in northern Chile of June 3, 2020 and the fifth node (51-52 degrees) from the Ryukyu Island earthquake of M 6.7 of June 13, 2020 and may  have been enhanced by energy from those sources.

 

O: 15JUN2020 07:27:35  22.8N   70.2E ML=4.4  EMSC   GUJARAT, INDIA               

O: 14JUN2020 14:43:07  23.3N   70.4E mb=5.1  EMSC   GUJARAT, INDIA               

O: 14JUN2020 14:43:07  23.3N   70.4E mb=5.3  IMD    GUJARAT, INDIA               

P: 14JUN2020 124760    24.0N   70.0E 3.5-4.9 AAAAA  India                      

 

Landfall of TS Nuri in southern China over the past two days probably helped promote earthquakes of M>=6 in the northern Ryukyu Islands, Japan; the northern Mariana Islands and Taiwan. This activation continued today with a major swarm of moderate earthquakes in the southwestern Ryukyu Islands northeast of Taiwan The largest of these lightly felt earthquakes was an M 5.2 but at least 10 others of M>=4.4 were also recorded. Yesterday's event of M 6.0 in Taiwan occurred about 150 km southwest of these today so they are not classical aftershocks of that event, but stress redistribution may have contributed to the timing of this swarm. The last earthquake of M>=5.2 within about 100 km of this epicenter was an M 5.7 on October 23, 2018. Forecast 124765 had expected today's activity in this area was likely around June 14. This activity is at the fifth node (72 degrees) from Northeastern Turkey and may have been enhanced by energy from that source.

 

O: 15JUN2020 04:53:39  24.8N  123.1E mb=4.5  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 14JUN2020 22:26:10  24.8N  123.2E Mw=4.7  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 01:14:40  24.8N  123.2E mb=4.5  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 02:32:53  24.8N  123.2E mb=4.5  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 14JUN2020 18:37:41  24.8N  123.3E mb=4.6  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 14JUN2020 18:15:11  24.9N  123.2E mb=4.8  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 01:55:44  24.9N  123.3E mb=4.4  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 15JUN2020 03:01:21  24.9N  123.3E mb=4.7  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 14JUN2020 17:28:38  24.9N  123.4E mb=4.6  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 14JUN2020 19:26:20  25.0N  123.3E Mw=5.2  EMSC   SOUTHWESTERN RYUKYU ISL., JAPA

P: 14JUN2020 124765    24.0N  123.0E 4.0-5.6 AAAAA  Taiwan                     

 

An unusual M 4.9 in western Mindanao, Philippines may also have been promoted by landfall of TS Nuri. NEIC reported this earthquake of M 4.9 in Mindanao, Philippines  was felt with intensity IV-V in the area(s) of Mindanao, Philippines at Ipil, Zamboanga and Davao.  PHIVOLCS reported this quake was felt with intensity IV in Siocon and Sirawai, Zamboanga del Norte; Zamboanga City and III in Ipil, Zamboanga Sibugay, Philippines. The last earthquake of M>=4.9 within about 200 km of this epicenter in Mindanao was recorded on March 3, 2020 with M 5.0 and prior to that as an M 5.5 on January 7, 2019. Forecast 124709 had expected regional activity around June 14.

 

O: 14JUN2020 22:29:57   7.7N  121.7E Mw=4.9  EMSC   MINDANAO, PHILIPPINES        

P: 14JUN2020 124709     5.0N  124.0E 4.0-5.6 ACBAA  Mindanao, Philippines      

 

The strongest earthquake in the U.S. or Canada today was an M 4.2-4.7 in the Southern Idaho aftershock zone of the March 31, 2020 M 6.5. NEIC reported maximum intensity for this event was IV at Stanley, Idaho with II-III shaking in Idaho at Lowman, Garden Valley, Cascade, Ketchum, Fairfield, Hailey, May, Garden City and Boise. This is the first aftershock in southern Idaho of M 4.7 or greater since the mainshock of M 6.5 on March 31, 2020 and the third largest event in the area in the past 30 years - after a similar M 4.7 on January 28, 1995. Forecast 124830 had expected today's event was likely around June 13.

 

O: 14JUN2020 12:11:38  44.3N  115.0W Ml=4.7  EMSC   SOUTHERN IDAHO               

P: 13JUN2020 124830    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

THREE STRONG EARTHQUAKES SHAKE NORTHWEST PACIFIC RIM

 

EARTHQUAKE SUMMARY FOR JUNE 13, 2020

 

A series of three strong earthquakes occurred today marking a sudden change in global  seismicity. The last date on which there were three or more earthquakes of M>=6 recorded on the same date was January 7, 2020 when events of M 6.2 hit Sumatra; M 6.4 in Puerto Rico and M 6.0 in New Britain. The last time more than three such non-aftershocks of M>=6 occurred on the same date was more than five years ago and probably longer than that. The last events of M>=6.7 in the world were of M 6.7-6.8 on June 3, 2020 in northern Chile and on May 6, 2020 in the Banda Sea. The last of larger magnitude was an M 7.5 in the northern Kuril Islands on March 25, 2020. Today's events occurred in Taiwan (M 5.5-6.0) and the Ryukyu Islands to the north in southwestern Japan (M 6.6-6.8) and in the northern Mariana Islands (M 6.2). The events in Taiwan and the Ryukyu Islands occurred as Tropical Nuri made landfall southwest of Taiwan on the Asian mainland. The event in the Mariana Islands may also have influenced by landfall of TS Nuri.  This summary had noted the relation between TS Nuri and possible induced regional seismicity as:

    

"TS Nuri  (02W) continued today east of the Philippines with winds up to 35 kts. No major changes to seismicity in the region are anticipated with this storm at this time but large earthquakes in Taiwan (M 5.5) and the Ryukyu Islands (M 6.7) may have been promoted by stresses from TS Nuri today." (June 13-14, 2020)

 

A strong M 6.6-6.8 earthquake occurred today in the area of the northern Ryukyu Islands, Japan. NEIC reported it was felt with maximum intensity IV in Kagoshima, and Okinawa, Japan. JMA reported it at M 6.3 and that it was felt with moderate intensity in southern and central Japan. Several days before an unusual earthquake off western North Island, New Zealand a great quake in southern Honshu occurred on December 20, 1946. In the previous issue of this summary this had been noted as:

 

" No earthquakes of M>=4.0 have occurred in this region northwest of North Island, New Zealand within about 300 km in at least 30 years. The only events within this area on record of M>=4.7 occurred on December 28, 1976 and December 26, 1946 (both M 5.4) and on January 27, 1945 (M 5.1). ... A series of great earthquakes in Central Honshu and the Kuril Islands of M 7.9 and 8.4 occurred on December 20 and 21, 1946 and may have helped trigger the New Zealand event of December 26, 1946." (June 12-13, 2020)

 

It might be added that the M 4.9 off Spain, near the antipode of the New Zealand

event was located at 103 degrees from the Ryukyu epicenter. No tsunami was reported with today's event which is at the lower limit of magnitude that might generate a tsunami. It occurred at 100 km too deep to generate a sizable tsunami as well. The last earthquake in the Ryukyu Islands with M>=6.7 within about 250 km of today's epicenter was an M 6.7 on November 13, 2015 and prior to that an M 6.9 on November 8, 2011. The only such event in the region in the past 30 years had been an M 7.1 on October 18, 1995. Forecast 124763 had expected today's event within about 50 km was likely around June 14.

 

O: 13JUN2020 15:51:22  28.9N  128.3E Mw=6.7  EMSC   RYUKYU ISLANDS, JAPAN        

P: 14JUN2020 124763    29.0N  128.0E 4.0-5.5 AAAAA  Ryukyu Islands             

 

The event of M 6.7-6.8 in the Ryukyu Islands, Japan was preceded by an M 5.4-6.0 in the area of Taiwan. NEIC reported it was felt with maximum intensity IV in Taipei and II-III in Keelung, Taoyuan, Hsinchu, Taitung, Changhua and Tainan, Taiwan. CWB reported this earthquake was felt with intensity III in Hualien, Yilan, Nantou, Hsinchu, Yunlin, Chiayi, II in Taipei, Taoyuan, Keelung City, Taichung, Miaoli, Changhua, Kaohsiung, Tainan and I in Pingtung and Penghu, Taiwan. The local network CWB gave M 6.0 for this event and this is the preferred magnitude having been determined from local data. The last event in Taiwan within about 200 km of this epicenter with M>=6 occurred on April 18, 2019 (M 6.1) and prior to that as an M 6.4 on February 6, 2018.  Forecast 124765 had expected today's event within about 50 km was likely around June 14.

 

O: 13JUN2020 20:18:59  24.3N  122.5E Mw=5.4  EMSC   TAIWAN REGION                

O: 13JUN2020 20:19:00  24.3N  122.4E ML=6.0  TAI    Hualien, Taiwan              

P: 14JUN2020 124765    24.0N  123.0E 4.0-5.6 AAAAA  Taiwan                     

 

The M 6.2 in the northern Mariana Islands was not reported felt. It occurred at a depth greater than 620 km in a sparsely populated area. The last earthquake within about 200 km of this epicenter with M>=6.2 was an M 6.4 on June 28, 2019 and an M 7.7 on July 29, 2016. Today's event had been forecast to occur in this area in early June.

 

O: 13JUN2020 21:08:31  18.9N  145.0E Mw=6.2  EMSC   PAGAN REG., N. MARIANA ISLANDS

P:  4JUN2020 124505    18.0N  146.0E 4.0-5.5 CAAAA  No. Marianas               

 

The strongest seismicity in the U.S. or Canada today occurred as a pair of M 4.9-5.0 earthquakes in the Aleutian Island, Alaska. The strongest of these was an M 5.0 in the western Andreanof Islands but an M 4.9 was also recorded in the Fox Islands south of the Aleutians. Neither event was reported felt in these remote areas. The M 5.0 in the Andreanof Islands is the strongest in that Island group since an M 5.1 about 100 km to the west of today's epicenter on March 3, 2020 more  than three months ago. Forecast 124854 had expected this event was likely around June 14. 

 

O: 13JUN2020 11:43:33  51.3N  178.4W Mw=5.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 14JUN2020 124854    51.0N  179.9W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

The last earthquake within about 200 km of the Fox Islands event with M>=4.9 was an M 5.3 on September 23, 2019. Forecast 124860 had expected today's event was likely around June 11.

 

O: 13JUN2020 19:02:08  52.0N  166.0W mb=4.9  EMSC   SOUTH OF ALEUTIAN ISLANDS    

P: 11JUN2020 124860    51.7N  166.4W 3.5-5.3 AAAAA  Fox Islands, Aleutians     

 

 

 

 

 

NEW ZEALAND QUAKES MAY SIGNAL COMING GLOBAL SEISMIC ENHANCEMENT

 

EARTHQUAKE SUMMARY FOR JUNE 12, 2020

 

The strongest earthquake in the world today was an M 4.7-5.3 in South Island, New Zealand. NEIC reported it was felt with intensity IV in Queenstown and II-III in Arrowtown, Te Anau, Wanaka, Otago, Cromwell, Dunedin and possibly as far as Lower Hutt, North Island. GEONET reported 1737 people felt this quake with 885 with weak intensity; 732 with light intensity and 102 with moderate intensity. Ten  reported strong shaking, 3 with severe intensity and 5 extreme intensity. The last earthquake within about 200 km of today's epicenter in South Island with M>=5.3 occurred on August 12, 2019 with M 5.4 and prior to that as an M 5.4 on June 7, 2016. Forecast 124933 had expected today's event was likely within about 50 km of this epicenter around June 13.

 

O: 12JUN2020 07:29:18  44.5S  167.8E Mw=4.7  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 12JUN2020 07:29:17  44.4S  167.8E ML=5.3  GEONET Felt with moderate intensity

P: 13JUN2020 124933    44.0S  168.0E 3.0-5.0 AAAAA  So. Island, N.Z.           

 

The earthquake in South Island, New Zealand today was accompanied by an unusual earthquake west of North Island, New Zealand of M 4.7. The epicenter of this event is quite unusual. No earthquakes of M>=4.0 have occurred in this region northwest of New Zealand within about 300 km in at least 30 years. The only events within this area on record of M>=4.7 occurred on December 28, 1976 and December 26, 1946 (both M 5.4) and on January 27, 1945 (M 5.1). An M 7.1 hit in the Loyalty Islands on February 1, 1945; an M 6.5 in the Kermadec Islands on December 30, 1946.  A series of great earthquakes in Central Honshu and the Kuril Islands of M 7.9 and 8.4 occurred on December 20 and 21, 1946 and may have helped trigger the New Zealand event of December 26, 1946. And an M 6.3 in northern Chile on December 28, 1976 but none were associated with a subsequent major or great earthquake in the several days following.

 

O: 13JUN2020 02:19:22  39.0S  166.6E ML=4.7  EMSC   NORTHWEST OF NEW ZEALAND     

 

Near the antipode of the event west of North Island an M 4.9 occurred later in the day off the west coast of Spain. This is within about 300 km of the exact antipode of the New Zealand event (39N 13W). The combination of these unusual near-antipodal quake suggests something may be brewing in global seismicity. Today's earthquake off Spain is the largest within about 250 km of that epicenter since an M 5.5 on December 17, 2009 more than 10 year ago.  Forecast 124784 had expected today's event was likely within about 100 km of this epicenter around June 13. After the event in New Zealand and an M 5.1 in Tonga, this is the third largest event in the world today. There is no history of unusual major global events following the rare events of M>=4.9 in this region off Spain in  the past 30 years. Antipodal earthquake pairs, especially those at rare epicenters, can precede changes in  global seismicity but how that might play out in this case is uncertain.

 

O: 13JUN2020 03:10:27  36.2N   10.7W mb=4.9  EMSC   AZORES-CAPE ST. VINCENT RIDGE

P: 13JUN2020 124784    37.0N   10.0W 3.5-5.4 AAAAA  Morocco/Spain              

 

Unusual earthquakes in the New Zealand area have been known to just precede major global events. For example, on February 25, 2010 this summary noted an unusual earthquake off the coast of northern New Zealand which was nearly identical to a similar event on May 20, 1960 as possibly being a precursor to an upcoming major global event as:

 

 

"A very unusual earthquake hit northwest of New Zealand with M 5.3 today. This is the strongest earthquake recorded within about 1000 km of this epicenter in the past 23 years. The only events in the area in recent years occurred on April

16, 1993 when earthquakes of M 4.9 and 5.0 were recorded  within about 30 of this epicenter. The epicenter has been active from time to time however. On July 26, 1987 an event of M 5.4 hit nearby. The strongest regional  earthquake hit as an M 6.6 on May 20, 1960. This may be significant because one day later on May 21, 1960 one of the strongest earthquakes in modern history - an M 9+ hit Central Chile with many accompanying earthquakes of M 8+. Could this be a canary in a coal mine? Might it indicate stresses at the point of breaking elsewhere? Because there are very few events which occur in this region, no statistical statement in this regard can be made. In the four other instances of verified earthquakes near this earthquakes of M>=6.8 have hit within four days." (February 25, 2010)

 

An M 8.8 occurred two days later on February 27, 2010 in Central Chile doing much damage.

 

Likewise on December 24-25, 2004, this summary noted this possibility  following a great earthquake of M 8.1 the day before south of New Zealand as:

 

"When great earthquakes occur with strike-slip mechanism (which causes horizontal movements in the earth's crust) there is usually a quiet period in global seismicity lasting for up to 3-4 days following the great quake followed by a dramatic increase in global seismicity. The regional seismicity is normally

not included in this quiet period. Regional seismicity normally shows a strong increase especially in epicenters at unusual locations. Moderately strong earthquakes continued today in the Macquarie Island region south of New Zealand today following yesterday's M 8.1 in the region." (December 24-25, 2004)

 

On December 26, 2004 a great M 9.3 earthquake in Sumatra triggered the most deadly tsunami on record, killing nearly a quarter of a million around the Indian Ocean.

 

An M 4.6 earthquake shook regions of Southern Puerto Rico today. It was widely felt in much of southern Puerto Rico and was the largest in the U.S. or Possessions today. NEIC reported it was felt with intensity V in Puerto Rico at Ensenada, Guanica, Sabana Grande; IV in Lajas, Yauco, San German, Cabo Rojo, Hormigueros and Ponce and III in Maricao. This is an aftershock of activity that began in the region with an M 4.7 on December 28, 2019 with the largest event an M 6.4 on January 7, 2020. The last earthquake of M>=4.6 in the region occurred on May 2, 2020 with M 5.4 and 4.6. Forecast 124754 had expected today's event within about 10 km was likely around June 15.

 

O: 12JUN2020 07:36:35  17.9N   66.7W Mw=3.5  EMSC   PUERTO RICO REGION

O: 13JUN2020 05:52:33  17.9N   66.9W mb=4.6  EMSC   PUERTO RICO REGION

O: 12JUN2020 11:24:40  18.0N   66.9W MD=3.0  EMSC   PUERTO RICO REGION

P: 15JUN2020 124754    18.0N   67.0W 3.4-4.9 BAAAA  Puerto Rico                

 

ENHANCED OCEAN RIDGE ACTIVITY CONTINUES

 

EARTHQUAKE SUMMARY FOR JUNE 11, 2020

 

The enhanced seismicity on Ocean Ridges which saw the last in the Southern Mid-Atlantic Ridge yesterday of M 6.0 continued today with and M 5.8 in the Prince Edward Island region of the South Indian Ocean. It was not reported felt in this remote area. The antipodal area of this epicenter off the northwestern coast of the U.S. west of California an Oregon. This event is a bit small to significantly enhance seismicity in this area but some minor enhancement in the area is possible over the next several days. Most of the activity in this area off the coast of California and Oregon occurs well to the east of the antipode of today's Prince Edward Islands event. The last earthquake within about 300 km of today's Prince Edward event occurred as an M 6.7 on January 22, 2019; an M 6.0 on April 19, 2018 and an M 6.1-6.3 on July 4, 2005.  Forecast 124931 had expected an event with magnitude up to M 5.8 in the area about 250 km northeast of today's epicenter was likely in mid-June.

 

O: 12JUN2020 02:53:23  43.1S   41.8E Mw=5.8  EMSC   PRINCE EDWARD ISLANDS REGION 

P: 18JUN2020 124931    41.0S   43.0E 4.0-5.8 CBBAA  So. Indian Ocean           

 

An M 5.2 also occurred in the area of Ascension Island, southern mid-Atlantic Ridge today. This is not an aftershock of the M 6.0 more than 1000 km to the south yesterday. This is the strongest event within about 250 km of this epicenter since an M 5.3 on June 6, 2020 and an M 5.4 on May 6, 2019.  The event a week ago was about 250 km southwest of today's epicenter but also near Ascension Island. Forecast 124726 had expected today's event was likely in this area around June 10.

 

O: 12JUN2020 00:53:26   6.8S   11.9W Mw=5.2  EMSC   ASCENSION ISLAND REGION       

P: 10JUN2020 124726     5.0S   12.0W 4.0-5.5 ABAAA  No. of Ascension Isl       

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Alaska Peninsula. It was not reported felt in this remote area. The last earthquake of M>=4.4  within about 150 km of this epicenter was an M 4.6 on May 9, 2020. Of the four other such events in the past six months, the strongest was an M 4.9 on February 17, 2020. Forecast 124852 had expected today's event in this area was likely around June 14.

 

O: 12JUN2020 04:48:48  57.4N  155.2W mb=4.4  EMSC   ALASKA PENINSULA             

P: 14JUN2020 124852    56.8N  157.7W 3.5-5.0 AABAA  Alaska Peninsula           

 

 

STRONG QUAKE IN SOUTHERN MID-ATLANTIC RIDGE

 

EARTHQUAKE SUMMARY FOR JUNE 10, 2020

 

The strongest earthquake of the day was an M 6.0 in the southern mid-Atlantic Ridge. It was followed by an M 5.4 aftershock, the second strongest quake in the world today. These remote events were note reported felt. This is the strongest earthquake in the southern mid-Atlantic since an M 6.3 on May 24, 2015 - the only such event within about 300 km of today's epicenter in the past 30 years. Forecast 124900 had expected today's event was likely in this area around June 10. This continues the activation of ocean-ridges reported in this summary on June 7 as:

 

 

"The strongest seismicity in the world today was a series of moderate earthquakes on Ocean ridges. These included an M 5.0 north of Svalbard in the Arctic Ocean; a pair of M 4.5 and 4.7 in the Northern Mid-Atlantic Ridge, within a couple of hours of the full moon; Ascension Island region at M 5.3, the largest earthquake in the world today and an M 4.6 in the Central Mid-Atlantic Ridge. These had been expected in forecasts 124456, 124645 and 124595. The quake in Ascension Island area was at 103 degrees from the landfall of TC Amphan and the event of M 5.0 in Svalbard was at 103 degrees from the M 7.3 in Banda Sea of May 5, the last major global earthquake. These may also have contributed to today's event magnitudes. Much of the seismicity at mid-ocean ridges is related to mobile magma which is easily mobilized at full and new moon tidal alignments. It is not surprising that these events occurred with today's full moon." (June 6-7, 2020)

 

Today's epicenter is at 145 degrees from the M 7.6 in the Kuril Islands of March 25, 2020, the last major earthquake in the world. It is also near 103 degrees from the landfall of TC Amphan last week and was probably promoted by energy from these sources.

 

O: 10JUN2020 21:14:44  15.4S   13.2W Mw=5.4  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

O: 10JUN2020 19:58:50  15.8S   13.2W Mw=6.0  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P: 10JUN2020 124900    13.0S   15.0W 4.0-5.4 ACBAA  So. Mid-Atlantic Ridge     

 

The strongest earthquake in the U.S or Canada today was an M 4.0 in the central Andreanof Islands. It was not reported felt in this remote area. The last earthquake with equal or larger magnitude in central Andreanof Islands within about 100 km of today's epicenter was an M 4.0 on May 17, 2020. Forecast 124855 had expected today's activity was likely around June 11.

 

 

O: 10JUN2020 14:17:10  51.5N  175.3W ml=4.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 11JUN2020 124855    51.2N  174.4W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

 

SOUTHERN IRAN SHAKES TO MODERATE QUAKES

 

EARTHQUAKE SUMMARY FOR JUNE 9, 2020

 

The strongest earthquake felt in the world today was an M 5.7 in southern Iran. NEIC reported it was felt with maximum intensity VI in Fars, Iran at Gerash; IV in Kongan Bushehr and III in Shiraz as well as in Doha, Qatar. A foreshock of M 5.4 was felt with maximum intensity V in Abu Dhabi and Dubai, United Arab Emirates as well as in Bahrain, Qatar and Kongan, Iran. Today's events were probably promoted by tidal stresses associated with the full moon of June 5. The mainshock of M 5.7 occurred within about an hour of local solar midnight near the longitude of maximum tidal stress as reported in previous issues of this summary:

 

"The full moon will arrive on June 5 at 19:12 UT. Areas which are sub-solar at this time are near 110 West and those anti-solar at 70 East longitude. These include western U.S. in the west and Central Asia in the East. Some enhanced seismicity in these areas is likely during the next five days." (June 1-2, 2020)

 

Today's activity did not do any reported major damage in the region but some minor damage is likely. The last earthquake within about 200 km of this activity with M>=5.7 occurred nearly 10 years ago as an M 5.8 on July 20, 2010. An M 6.4 about 300 km northwest of this shook the area on April 9, 2013, the last such regional event at this magnitude or above. Forecast 124521 had expected today's activity was likely within about 50 km of this epicenter around June 6.

 

O: 09JUN2020 22:27:01  27.6N   53.3E mb=4.3  EMSC   SOUTHERN IRAN

O: 09JUN2020 19:44:53  27.6N   53.5E mb=4.2  EMSC   SOUTHERN IRAN

O: 10JUN2020 04:02:28  27.6N   53.5E mb=4.3  EMSC   SOUTHERN IRAN

O: 10JUN2020 05:52:13  27.7N   53.2E mb=4.4  EMSC   SOUTHERN IRAN

O: 09JUN2020 16:08:51  27.7N   53.4E Mw=5.4  EMSC   SOUTHERN IRAN

O: 09JUN2020 17:43:18  27.7N   53.4E mb=4.2  EMSC   SOUTHERN IRAN

O:  9JUN2020 17:18:14  27.7N   53.5E Mw=5.7  EMSC   SOUTHERN IRAN                

P:  6JUN2020 124521    28.0N   54.0E 3.5-5.1 BAAAA  So. Iran/Persian Gulf      

 

The strongest earthquake of the day was an M 5.9 in the Fiji Islands. It was not reported felt in this remote area. This region has been active over the past several days beginning with a moderate quake that shook Fiji on June 6 with M 5.8 and an M 5.9 on June 3 about 300 km southeast of today's epicenter. The last earthquake of M>5.9 in the area within about 250 km of today's epicenter was an M 6.0 more than a year ago on April 23, 2019. The last with shallow to intermediate focal depth (like today's) was an M 6.1 on April 2, 2018. Forecast 124681 and 124918 had expected today's activity in mid-June.

 

O: 10JUN2020 04:29:21  23.6S  179.2E Mw=5.9  EMSC   SOUTH OF FIJI ISLANDS        

P:  5JUN2020 124681    23.0S  179.0E 4.0-5.6 BAAAA  Tonga/Fiji                 

P: 17JUN2020 124918    23.0S  179.0E 4.0-5.4 CAAAA  Tonga/Fiji                 

 

The strongest earthquake felt in the U.S. or Canada today was an M 4.1 in the southern Idaho aftershock zone. NEIC reported it was felt with maximum intensity IV in Idaho at Stanley and II-III in Idaho at Lowman, Ketchum, Garden City, Boise, Eagle. These are aftershocks of the M 6.5 which hit the area on March 31, 2020. This aftershock sequence has been very active and prolonged. Earthquakes of M>=4 have been common occurring nearly weekly in southern Idaho but have concentrated near the new moon and probably are enhanced by tidal effects. The last of M>=4.1 was an M 4.4 on May 21 with the new moon and May 14, 2020. Similar shocks hit the area with the new moon on April 21 (M 4.1) and April 11 (M 4.3). Forecast 124589 had expected today's activity in the aftershock zone was likely around June 8.

 

O:  9JUN2020 15:44:08  44.3N  115.0W ML=2.5  EMSC   SOUTHERN IDAHO               

O:  9JUN2020 14:49:01  44.3N  115.0W ML=3.0  EMSC   SOUTHERN IDAHO               

O:  9JUN2020 13:54:02  44.3N  115.0W mb=4.1  EMSC   SOUTHERN IDAHO               

O:  9JUN2020 14:09:29  44.5N  115.2W Ml=2.5  EMSC   SOUTHERN IDAHO               

P:  8JUN2020 124589    44.5N  115.2W 2.0-4.2 AAAAA  Montana/Idaho              

 

An aftershock of M 4.1-4.2 also shook the area of western Nevada today. It was reported felt with intensity II in Tonopah, Fallon and Glenbrook, Nevada.

Like the activity in Idaho, this aftershock zone in Nevada has been quite active. The mainshock was an M 6.5 on May 15, 2020 but a moderate M 5.3 aftershock hit with the new moon on May 22. The only earthquake since then of M>4.2 was an M 4.8 yesterday on June 8. Forecast 124770 had expected today's activity was likely within about 10 km around June 14.

 

O: 09JUN2020 22:40:14  38.2N  117.9W ML=3.3  EMSC   NEVADA

O: 09JUN2020 13:38:54  38.2N  117.8W ML=3.9  EMSC   NEVADA

O: 09JUN2020 13:38:54  38.2N  117.8W ML=4.2  EMSC   NEVADA

O: 10JUN2020 04:34:49  38.2N  117.7W ML=3.1  EMSC   NEVADA                       

P: 14JUN2020 124770    38.1N  117.8W 2.5-4.4 BAAAA  California/Nevada area     

 

The strongest earthquake in the U.S. or Canada was an M 4.6 in the Alaska Peninsula region. It was not reported felt in this remote area. This is the strongest event within about 150 km of this epicenter since an M 5.1 more than a year ago on February 15, 2019. These are probably aftershocks of an M 6.0 that hit the area on December 31, 2018. Forecast 124629 had expected today's event was likely within about 10 km of this epicenter around June 9.

 

O:  9JUN2020 10:45:07  54.4N  161.4W mb=4.6  EMSC   ALASKA PENINSULA             

P:  9JUN2020 124629    54.3N  161.4W 3.5-4.9 AAAAA  Unimak Islands, Aleutians  

 

MODERATE AFTERSHOCK SHAKES BANDA SEA

 

EARTHQUAKE SUMMARY FOR JUNE 8, 2020

 

The strongest earthquake of the day was an M 5.6-6.0 in the Banda Sea, Indonesia

BMG reported this earthquake was felt with intensity III-IV in Namrole, III in Piru, II-III in Namlea and II in Ambon, Indonesia. The last earthquake within about 200 km of this epicenter with M>=5.6 occurred on October 11, 2018, also with M 5.6. The last of M>=6 in the area was an M 6.1 on February 26, 2018.

Forecasts 124473 and 124468 had expected today's activity in this area was likely around June 6-9.

 

O:  9JUN2020 04:56:11   4.1S  126.4E Mw=6.0  BMG    BANDA SEA                    

O:  9JUN2020 04:56:10   4.2S  126.4E Mw=5.6  EMSC   BANDA SEA                    

P:  6JUN2020 124473     3.0S  127.0E 4.0-5.7 BBAAA  Ceram area                 

P:  9JUN2020 124468     6.0S  125.0E 4.0-5.5 ABBAA  Banda Sea                  

 

Seismicity in eastern California and western Nevada aftershock zones gradually began returning to normal today. A moderate M 3.6 was felt in western Nevada with intensity II in Glenbook, Sparks, North Las Vegas. Forecast 124531 had expected this activity would continue in early June.

 

O:  8JUN2020 08:22:49  38.2N  118.0W ml=3.6  EMSC   NEVADA                       

P:  9JUN2020 124531    37.8N  118.2W 2.5-4.4 AAAAA  California/Nevada area     

 

The strongest earthquake in the U.S. or Canada, however was an M 4.3 in the Ridgecrest aftershock zone in east-central California. This earthquake was reported by NEIC to have been felt with maximum intensity V in Trona, California with II-III in Ridgecrest, Inyokern, Onyx, Fort Irwin, Kernville, Lake Isabella, Barstow, Helendale and Bodfish, California. The M 4.3 near the Nevada-California border  occurred in the Ridgecrest aftershock zone in California. NEIC reported it was felt with maximum intensity V in California at Trona and II-III in Ridgecrest, Inyokern, Onyz, Fort  Irwin, Kernville, Lake Isabella, Barstow, Helendale and Bodfish. This is an aftershock in the Ridgecrest, California zone following the strong events in that region on July 4 and 6, 2019. It is also the strongest aftershock of the M 5.5 in the area which occurred on June 4, 2020. The previous largest quake in the area was an M 5.0 on August 22, 2019. Forecast 124564 expected today's activity within about 25 km of this around June 5.

 

O:  8JUN2020 04:15:05  35.6N  117.4W Mw=4.3  EMSC   SOUTHERN CALIFORNIA          

P:  5JUN2020 124564    35.8N  117.6W 2.5-4.6 BAAAA  So. California             

 

An unusual earthquake of M 4.0 in the Peace River area of Alberta Canada continued the enhanced seismicity of the western U.S. and Canada today. It was not reported felt in this remote area. The only earthquakes in the past 30 years within about 200 km of this epicenter with M>=4 occurred as an M 4.2 on January 12, 2016 and an M 4.0 on June 13, 2015 about 200 km southwest of today's epicenter. Forecast 124613 had expected today's event to the west in Alberta was likely around June 5.

 

O:  9JUN2020 02:58:11  55.8N  116.4W ML=4.0  EMSC   ALBERTA, CANADA              

O: 09JUN2020 02:58:11  55.8N  116.4W MB=4.0  ECAN OF PEACE RIVER, AB  

P:  5JUN2020 124613    56.0N  120.0W 2.0-4.1 BABAA  Alberta                    

 

Two unusual earthquakes occurred today as Tropical Depression Cristobal moved through the central U.S. An M 2.3 occurred in Arkansas as the center of Cristobal passed over that epicenter and an M 2.4 occurred shortly after to the west in Northern Texas. Similar earthquakes in Arkansas have most recently occurred as an M 2.7 on May 27 and as an M 2.8 on April 6, 2020. The earthquake in Northern Texas of M 2.4 is the strongest within about 100 km of that epicenter since an M 3.2 on October  1, 2019. Tropical Depressions have low atmospheric pressure and can have an unloading effect on the land below leading to enhanced seismicity.

 

O:  8JUN2020 13:06:57  32.4N   97.4W mb=2.4  EMSC   NORTHERN TEXAS               

P:  7JUN2020 124569    35.0N   97.0W 2.0-4.1 ACAAA  Southern Plains            

 

O:  8JUN2020 09:25:40  36.3N   91.4W Md=2.3  EMSC   ARKANSAS                     

P:  9JUN2020 124548    36.5N   89.6W 2.0-4.1 AABAA  New Madrid area            

P: 29MAY2020 124337    34.0N   92.0W 2.0-4.3 CCAAA  Southeast U.S.             

 

After a series of light foreshocks a moderate M 4.6 shook the area of Albania today. EMSC reported this earthquake of M 4.7 in  Albania was felt with intensity II-III in the area(s) of Albania at Ishem, Nanze, Preze, Lao, Kruje, Nikel. This is the strongest aftershock in Albania to date of the M 5.3 and 5.1 of November 26, 2019. No major damage was reported. Forecast 124583 had expected regional activity in early June.

 

O:  8JUN2020 15:21:52  41.5N   19.6E mb=4.6  EMSC   ALBANIA                      

P:  5JUN2020 124583    41.0N   15.0E 3.0-5.3 BACAA  Italy                      

 

An M 4.5 in northern Puerto Rico near the Dominican Republic continued the active status of seismicity in that area. It is located near the Mona Passage. The area became active following the M 6.5 in Puerto Rico on January 7, 2020 in

the Ponce area to the south with events of M 4.6 on January 29 and M 4.5 on February 2, 2020. An M 6.0 occurred about 50 km east of this on September 24, 2019 and was the start of the current active conditions in Puerto Rico.  Forecast 124509 had expected today's event within about 40 km was likely around June 9.

 

NEIC reported this earthquake of M 4.4 in the Dominican Republic  was felt with intensity II-III in the area(s) at Dorado, Bayamon, San Juian and Trujillo Alto, Puerto Rico.

 

O: 08JUN2020 17:47:48  19.0N   67.6W mb=4.5  EMSC   PUERTO RICO REGION

P:  9JUN2020 124509    19.0N   68.0W 3.4-5.1 AAAAA  Puerto Rico                

 

 

 

 

 

 

 

 

 

ENHANCED SEISMICITY IN WESTERN U.S. AND SOUTHWESTERN PACIFIC CONTINUES

 

EARTHQUAKE SUMMARY FOR JUNE 7, 2020

 

Enhanced seismicity continued today in the southwest Pacific region. The strongest earthquake in the world today was an M 5.9 in New Britain. NEIC reported it was felt with intensity III in Kokopo East New Britain, PNG.

The event in New Britain was accompanied by a pair of similar events (M 5.7 and 5.8) in the Santa Cruz Islands north of Vanuatu. The last earthquake of M>=5.9 in New Britain within about 200 km of this epicenter was an M 6.2 on February 9, 2020 and an M 6.0 on January 7, 2020 and this is probably an aftershock of those events.  Forecast 124477 had expected this event within about 150 km was likely around June 9. 

 

O:  7JUN2020 20:06:39   5.4S  151.7E Mw=5.9  EMSC   NEW BRITAIN REGION, P.N.G.   

P:  9JUN2020 124477     7.0S  152.0E 4.0-5.5 ABAAA  New Britain                

 

The last earthquake in the Santa Cruz Islands area of M>=5.8 within about 200 km

of the M 5.7 and 5.8 in the Santa Cruz area occurred on August 20, 2019 with M 6.0 and July 17, 2018 with M 5.9. An M 6.6 hit about 200 km south of this on May 12, 2020 in the Santa Cruz Islands region and is probably an aftershock of that event. Today's activity occurred within about 1.5 hours of local solar midnight and was probably promoted by tidal stresses which maximize near this hour. Forecast 124656 had expected activity in the Santa Cruz area around June 5.

 

O:  7JUN2020 14:37:00  10.5S  166.2E Mw=5.8  EMSC   SANTA CRUZ ISLANDS           

O:  7JUN2020 14:43:27  10.6S  166.1E Mw=5.7  EMSC   SANTA CRUZ ISLANDS           

P:  5JUN2020 124656    10.0S  162.0E 4.0-5.6 AAAAA  No. of Santa Cruz Islands  

 

Enhanced seismicity also continued in western U.S. today. This appears to be related to tidal stresses associated with the recent full moon as noted in previous issues of this report:

 

"The full moon will arrive on June 5 at 19:12 UT. Areas which are sub-solar at this time are near 110 West and those anti-solar at 70 East longitude. These include western U.S. in the west and Central Asia in the East. Some enhanced seismicity in these areas is likely during the next five days. The passage of a near-earth asteroid near the same time (JPL# 163348) may enhance seismic effects." (June 1-2, 2020)

 

The strongest quake in the U.S. or Canada today was an M 4.8 in the western Nevada aftershock zone near Tonopah. NEIC reported it was felt with maximum intensity V in Nevada at Luning and IV in Gabbs and II-III in Goldfield, Hawthorne, Benton, Round Mountain, Tonopah and Fallon and in California at Bishop, Lee Vining. This is the strongest aftershock in the area of eastern Nevada since an M 5.3 on May 22, 2020. A similar aftershock of M 5.0 occurred on May 20. These are aftershocks of the M 6.5 in the area of May 15, 2020, the strongest event in the region in more than 30 years. Forecast 124531 had expected today's activity was likely around June 9. When the May 22 M 5.3 occurred this summary noted:

 

"A moderate earthquake of M 4.8-5.3 shook western Nevada in the Tonopah area. This is the strongest aftershock to date of the M 6.5 of May 15. NEIC reported it was felt with intensity II-III within about 130 km of the epicenter at Silverpeak, Goldfield, Hawthorne, Tonopah and Yerington, Nevada and in California at Bishop, Big Pine, Lee Vining, June Lake, Mammoth Lake.

It was probably enhanced by stresses associated with the new moon which also arrived May 22." (May 22, 2020)

 

O: 08JUN2020 03:24:05  38.2N  117.8W Mw=4.8  EMSC   NEVADA

O: 07JUN2020 20:18:55  38.2N  117.8W ML=3.3  EMSC   NEVADA

O:  7JUN2020 09:23:25  38.1N  118.0W ML=3.2  EMSC   NEVADA                       

P:  9JUN2020 124531    37.8N  118.2W 2.5-4.4 AAAAA  California/Nevada area     

 

The second strongest earthquake in the U.S. or Canada today was an M 4.3 in the Ridgecrest aftershock zone in California. NEIC reported it was felt with maximum intensity V in California at Trona and II-III in Ridgecrest, Inyokern, Onyz, Fort  Irwin, Kernville, Lake Isabella, Barstow, Helendale and Bodfish. This is an aftershock in the Ridgecrest, California zone following the strong events in that region on July 4 and 6, 2019. It is also the strongest aftershock of the M 5.5 in the area which occurred on June 4, 2020. The previous largest quake in the area was an  M 5.0 on August 22, 2019. Forecast 124564 expected today's activity within about 25 km of this around June 5.

 

O:  8JUN2020 04:15:05  35.6N  117.4W Mw=4.3  EMSC   SOUTHERN CALIFORNIA          

P:  5JUN2020 124564    35.8N  117.6W 2.5-4.6 BAAAA  So. California             

 

An M 3.8 also occurred in northern Nevada today. NEIC reported it was felt with intensity II in Elko, Nevada. This is the strongest earthquake within about 150 km of this epicenter since an M 4.0 on January 24, 2014. A strong M 6.0 occurred on February 21, 2008 to the east of this epicenter. Forecast 124306 expected moderate seismicity to the southwest of this was likely  around May 30.

 

O:  7JUN2020 08:56:17  41.2N  116.0W ml=3.8  EMSC   NEVADA                       

P: 30MAY2020 124306    39.9N  118.4W 2.5-4.4 CBBAA  California/Nevada area     

 

MODERATELY STRONG QUAKE SHAKES FIJI

 

EARTHQUAKE SUMMARY FOR JUNE 6, 2020

 

A moderately strong M 5.7-5.8 was widely felt in the area of Fiji today. NEIC reported maximum intensity IV in Sigatoka, Fiji with II-III shaking in Fiji at Tavua, Vatukoula, Ba, Lautoke, Nadi, Suva and Savusavu. This activity began with a M 5.0 foreshock south of the Fiji Islands which was felt with intensity II in Namosi, Central Fiji Islands. NEIC reported an aftershock of M 5.0 in  Fiji was felt with intensity II-III in the area(s) of Fiji in Lautoka and Nadi, Western Fiji; III-IV in Central Fiji at Korovou and Nauson and III in Levuka, Eastern Fiji Islands. Despite what some may think, felt earthquakes in the Fiji Islands are rare. This group is situated midway between two active seismic zones - the Vanuatu Islands to the west and the Tonga Islands to the east and sees large deep focus earthquakes but little large-magnitude shallow focus activity. The last earthquake of significantly larger magnitude within about 200 km of today's epicenter occurred as an M 6.4-6.5 on April 7, 2006 more than 14 years ago.

 

"The full moon will arrive on June 5 at 19:12 UT. Areas which are sub-solar at this time are near 110 West and those anti-solar at 70 East longitude. These include western U.S. in the west and Central Asia in the East. Some enhanced seismicity in these areas is likely during the next five days. The passage of a near-earth asteroid near the same time (JPL# 163348) may enhance seismic effects." (June 1-2, 2020)

 

The passing of Asteroid 163348 at 11:20 UT on June 6, 2020 while providing little in the way of tidal stresses may also have been a factor in the timing of today's earthquake. The timing was important however as the M 5.8 occurred within about 30 minutes of the closest approach of this asteroid to earth (earthquake at 10:55, Asteroid at 11:20 UT). According to JPL data, this asteroid is the largest to make a near-earth approach since the large asteroid with diameter up to 4 km passed on April 29 (#52768). The next such asteroid with diameter larger than 1 km is 136975 due on May 22 at 05:45 UT. A smaller asteroid of little concern will pass earth on May 10.

 

Several other moderate earthquakes also occurred today in the Southwest Pacific and the Fiji Islands group may be a catalyst for strong regional activation in the next several days.

 

Forecast 124653 had expected today's M 5.8 in Fiji was likely within about 100 km of this epicenter around June 3. This epicenter is at 104 degrees from last major earthquake on earth - the M 6.8 in Northern Chile of June 3, 2020 and probably was promoted by energy from that source.

 

O:  6JUN2020 10:55:42  16.6S  177.4E Mw=5.8  EMSC   FIJI                         

O:  7JUN2020 03:42:37  16.7S  177.4E mb=5.0  EMSC   FIJI                          

P:  3JUN2020 124653    16.0S  178.0E 4.0-5.4 AAAAA  Fiji Islands               

 

 

An M 3.8 in eastern Nevada continued the reactivation of that area today. NEIC reported it was lightly felt as far as Glenbrook, Nevada 200 km from the epicenter. NEIC reported an earthquake of M 3.5 in Coso Junction, California  was also felt with intensity II-III in the area(s) of Coso Junction, California at East Tulare County (IV); Lone Pine, Lake Isabella, Ridgecrest, Bodfish, Bakersfield, Lancaster. Forecast 124531 had expected this activity was likely around June 9. Four events of M>=3.5 have hit the area of eastern Nevada in a 24-hour period between mid-June 5 and mid-June 6, the most in a 24 hour period since May 26-27.

 

O: 07JUN2020 01:47:07  38.2N  117.9W ML=3.3  EMSC   NEVADA

O: 06JUN2020 10:13:03  38.2N  117.8W ML=3.4  EMSC   NEVADA

O: 06JUN2020 10:13:04  38.2N  118.0W ML=3.8  ANSS   NEVADA

O: 06JUN2020 05:41:18  38.2N  118.0W ML=3.4  EMSC   NEVADA

O: 06JUN2020 02:28:14  38.2N  117.8W ML=4.1  ANSS   NEVADA

P:  9JUN2020 124531    37.8N  118.2W 2.5-4.4 AAAAA  California/Nevada area     

 

Elevated seismicity also continued on mid-Ocean ridges today. This, as noted in the previous issue of this summary is probably related to the full moon which was completed on June 5. These events included an M 5.3 in the South Sandwich Islands; an M 5.0 in the Norwegian Sea; an M 5.1 in the Mid-Indian Ridge, an M 4.7 in the northern mid-Atlantic; and at two separate epicenters in the Azores with M 4.6 and 4.2.

 

O:  6JUN2020 08:05:57  57.8S   25.3W mb=5.3  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  4JUN2020 124699    57.0S   26.0W 4.0-6.0 AAAAA  So. Sandwich Islands       

 

O:  6JUN2020 20:19:51  70.8N   12.4E mb=4.5  EMSC   NORWEGIAN SEA                

 

O:  6JUN2020 22:21:12  31.0N   41.1W mb=4.7  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 31MAY2020 124321    31.0N   41.0W 4.0-5.5 CAAAA  No. Mid-Atlantic Ridge     

 

O:  6JUN2020 21:42:26  36.2N   33.8W mb=4.6  EMSC   AZORES ISLANDS REGION        

 

O:  6JUN2020 21:42:26  43.0N   31.3W ML=4.2  EMSC   AZORES ISLANDS REGION        

P:  5JUN2020 124595    42.0N   29.0W 4.0-6.1 AABAA  No. Mid-Atlantic Ridge     

 

O:  7JUN2020 03:39:53  23.7S   69.8E mb=5.1  EMSC   MID-INDIAN RIDGE             

 

SEISMICITY ENHANCED IN AREAS OF HIGH HEAT FLOW WITH FULL MOON

 

EARTHQUAKE SUMMARY FOR JUNE 5, 2020

 

The strongest seismicity in the world today was a series of moderate earthquakes

on Ocean ridges. These included an M 5.0 north of Svalbard in the Arctic Ocean;

a pair of M 4.5 and 4.7 in the Northern Mid-Atlantic Ridge, within a couple of

hours of the full moon; Ascension Island region at M 5.3, the largest earthquake in the world today and an M 4.6 in the Central Mid-Atlantic Ridge. These had been expected in forecasts 124456, 124645 and 124595. The quake in Ascension Island area was at 103 degrees from the landfall of TC Amphan and the evnet of M 5.0 in Svalbard was at 103 degrees from the M 7.3 in Banda Sea of May 5, the last major global earthquake. These may also have contributed to today's event magnitudes. Much of the seismicity at mid-ocean ridges is related to mobile magma which is more easily mobilized at full and new moon tidal alignments. It is not surprising that these events occurred with today's full moon.

 

O:  5JUN2020 13:26:18   7.0N   33.5W mb=4.6  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P:  2JUN2020 124456     8.0N   37.0W 4.0-5.8 BBCAA  Central Mid-Atlantic Ridg  

 

O:  6JUN2020 05:03:04   7.5S   13.6W mb=5.3  EMSC   ASCENSION ISLAND REGION       

 

O:  5JUN2020 16:26:02  81.4N    3.3W Mw=5.0  EMSC   NORTH OF SVALBARD            

P:  5JUN2020 124645    79.0N    7.0E 4.0-5.7 ACAAA  Arctic Ocean Region        

 

O:  5JUN2020 21:22:03  45.3N   28.2W mb=4.7  EMSC   NORTHERN MID-ATLANTIC RIDGE  

O:  5JUN2020 20:27:06  45.4N   27.9W mb=4.5  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P:  9JUN2020 124595    45.0N   28.0W 4.0-5.4 AAAAA  No. Mid-Atlantic Ridge     

 

After a quiet day yesterday with no earthquakes of M>=3 in the eastern Nevada aftershock zone, several events of M 3.5 and 4.1 hit the area today. These were reported felt with light intensity as far as 200 km away at Glenbrook and Overton, Nevada. This may be related to the arrival of the full moon today with maximum tidal stresses in the western U.S. as noted in previous issues of this summary:

 

"The full moon will arrive on June 5 at 19:12 UT. Areas which are sub-solar at this time are near 110 West and those anti-solar at 70 East longitude. These include western U.S. in the west and Central Asia in the East. Some enhanced seismicity in these areas is likely during the next five days. The passage of a near-earth asteroid near the same time (JPL# 163348) may enhance seismic effects." (June 1-2, 2020)

 

Today's M 4.1 in Nevada is the strongest in that aftershock zone since an M 4.2 on May 27, 2020. Forecast 124531 had expected this activity was likely around June 4.

 

O: 06JUN2020 05:41:18  38.2N  118.0W ML=3.4  EMSC   NEVADA

O: 06JUN2020 02:28:14  38.2N  117.8W ML=3.7  EMSC   NEVADA

O: 06JUN2020 02:28:13  38.2N  117.8W ML=4.1  ANSS   NEVADA

O: 06JUN2020 10:13:03  38.2N  117.8W ml=3.7  EMSC   NEVADA

O: 05JUN2020 17:48:03  38.1N  118.1W ML=3.1  EMSC   NEVADA

O: 05JUN2020 16:39:07  38.2N  117.8W ML=3.5  EMSC   NEVADA

P:  4JUN2020 124531    37.9N  118.2W 2.5-4.5 AAAAA  California/Nevada area     

 

In addition to the moderate earthquake in western Nevada today, an M 3.8-4.0 also shook the area of southern Idaho with lots of foreshocks and aftershocks.

NEIC reported this earthquake of M 3.8-4.1 in Southern Idaho  was felt with intensity II-III in the area(s) of Idaho at Lowman, Stanley, Boise, Emmett, Eagle, Pollack and Meridian. Forecast 124589 had expected today's event in Idaho was likely around June 4.

 

O: 06JUN2020 01:58:00  44.3N  115.1W ML=2.5  EMSC   SOUTHERN IDAHO

O: 05JUN2020 15:03:09  44.3N  115.1W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 05JUN2020 07:33:16  44.3N  115.2W Ml=2.4  EMSC   SOUTHERN IDAHO

O: 05JUN2020 11:36:05  44.3N  115.2W Ml=2.4  EMSC   SOUTHERN IDAHO

O: 05JUN2020 22:35:39  44.3N  115.2W Ml=2.7  EMSC   SOUTHERN IDAHO

O: 05JUN2020 10:46:52  44.4N  115.2W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 05JUN2020 17:33:36  44.5N  115.2W ML=2.1  EMSC   SOUTHERN IDAHO

O:  5JUN2020 14:12:26  44.3N  115.0W Ml=2.7  EMSC   SOUTHERN IDAHO               

O:  5JUN2020 18:36:44  44.5N  115.2W Ml=4.0  EMSC   SOUTHERN IDAHO               

P:  4JUN2020 124589    44.5N  115.2W 2.0-4.2 AAAAA  Montana/Idaho              

 

An M 2.6 at 110 West longitude in Yellowstone National Park, Wyoming today was the strongest in that area since M 2.9, associated with the M 6.5 in Idaho of

March 31 occurred. A pair of M 2.5 events hit Yellowstone on May 29, the only other  such events in the past half year (an M 2.5-2.6 on January 10, 2020 was far to the east of these). Today's event is at the maximum tidal longitude with this full moon and was probably promoted by tidal stresses. Like mid-ocean ridges much of  the activity in the western U.S. is in areas of high heat flow where fluids are more easily mobilized by high tidal stresses and most likely to see enhanced seismicity with lunar-solar tidal alignments. Forecast 124610 had expected today's event within about 25 km was likely around June 4.

 

O:  6JUN2020 01:19:02  44.8N  110.8W Ml=2.6  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P:  4JUN2020 124610    44.6N  110.8W 2.0-3.9 AAAAA  Yellowstone/Wyoming        

 

This regional activation has included moderate earthquakes of M 5.5 in the Ridgecrest, California aftershock zone and an M 4.0 in the Southern Idaho aftershock zone among others.

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the Kodiak region of Alaska. NEIC reported it was felt with intensity IV in Kodiak, Alaska.

An M 4.8 hit the same area on May 23 and an M 5.2-5.3 occurred east of this in the Kodiak Island area on April 17, the only such events at this magnitude level in the area this year. Forecast 124512 had expected today's activity was likely around June 5 to the west of today's epicenter.

 

O:  5JUN2020 13:47:45  56.2N  154.0W mb=4.5  EMSC   KODIAK ISLAND REGION, ALASKA 

P:  5JUN2020 124612    56.5N  157.7W 3.5-5.2 AABAA  Alaska Peninsula           

 

The second strongest earthquake in the world today was an M 5.2 in Eastern Turkey. It was reported by EMSC to have been lightly felt in the epicentral area. This epicenter is at 103-104 degrees from the M 5.5 in the Ridgecrest  aftershock zone two days ago and was probably enhanced by energy from that source. This is the strongest earthquake within about 250 km since an M 6.7 on January 24, 2020 and an M 5.6 on March 2, 2017. This summary has previously speculated that energy from the M 6.7 in January helped promote seismicity in Central California and vice-versa following the M 6.5 and 7.1 in California in early July, 2019. Forecasts 123571 and 124570 had expected today's activity in Turkey between June 3 and 8.

 

O:  5JUN2020 18:06:22  38.3N   38.7E mb=5.2  EMSC   EASTERN TURKEY               

P:  3JUN2020 124571    39.0N   41.0E 3.5-4.9 AABAA  Turkey                     

P:  8JUN2020 124570    38.0N   36.0E 3.5-5.1 BBBAA  Turkey                     

 

STRONG QUAKE RATTLES TALAUD ISLANDS, INDONESIA

 

EARTHQUAKE SUMMARY FOR JUNE 4, 2020

 

An M 6.4-7.1 in the Talaud region of Indonesia June 4 was reported by BMG to have been felt with intensity IV in Morotai; II-III in Manado, Bitung, Minahasa, Ternate, Sitaro, Tahuna, Talaud and Bolaang, Mongondow, Indonesia. NEIC reported intensity IV in Indonesia at Ternate and II-III in Manado, Sulawesi, Buayan, Bato, and in Mindanao, Philippines. The last earthquake recorded within about 250 km of this epicenter in the Talaud Islands with M>=7.1 occurred on May 26, 2003 with M 7.0. Forecast 124462 had expected today's event was likely around June 9 within about 100 km of today's epicenter.  This epicenter is at 144 degrees from the M 7.7 off Cuba January 28, 2020 and was likely promoted by energy from that source.

 

Today's activity appears to have been promoted by a combination of the full moon and a geomagnetic storm several days ago as reported in previous issues of this summary as:

 

"The full moon will arrive on June 5 at 19:12 UT. Areas which are sub-solar at this time are near 110 West and those anti-solar at 70 East longitude. These include western U.S. in the west and Central Asia in the East. Some enhanced seismicity in these areas is likely during the next five days. The passage of a near-earth asteroid near the same time (JPL# 163348) may enhance seismic effects." (June 1-2, 2020)

 

"That geomagnetic storm was associated with a strong earthquake of M 6.1 in Southern Peru and by an M 5.5 in the Talaud Islands, Indonesia as noted at the time in this summary:

 

The mainshock occurred within about 15 minutes of local solar midnight - a time when both geomagnetic and tidal effects area maximized and was probably promoted by these effects.

 

O:  4JUN2020 03:18:12   2.6N  128.2E ML=4.2  EMSC   HALMAHERA, INDONESIA         

O:  4JUN2020 15:49:39   2.9N  128.2E mb=6.4  ANSS   KEPULAUAN TALAUD, INDONESIA  

O:  4JUN2020 15:49:41   2.8N  128.1E mb=7.1  BMG    KEPULAUAN TALAUD, INDONESIA  

O:  4JUN2020 08:49:38   3.0N  128.2E Mw=6.4  EMSC   HALMAHERA, INDONESIA         

P:  5JUN2020 124462     5.0N  128.0E 4.0-5.4 ABAAA  Halmahera                  

P:  9JUN2020 124462     2.0N  129.0E 4.0-5.4 BAAAA  Halmahera                  

 

A moderate earthquake of M 4.2-4.4 was felt widely in the aftershock zone in Southern Puerto Rico today. NEIC reported maximum intensity V in Lajas and IV in Guanica, Guayania, Penuelas, Sabana Grande and Ponce with II in San German, Puerto Rico. This is the strongest earthquake in this area since an M 5.4 and 4.6 on May 2, 2020, a month ago. A double mainshock of M 5.8 on January 6, 2020 and M 6.5 on January 7, 2020 was preceded by a series of foreshocks and has been followed by an energetic aftershock sequence. Forecast 124509 had expected today's activity in the aftershock zone in early June.

 

O:  4JUN2020 14:46:18  17.9N   66.8W mb=4.4  EMSC   PUERTO RICO REGION           

P:  6JUN2020 124509    18.0N   67.0W 3.4-5.0 AAAAA  Puerto Rico                

 

The largest earthquake in the U.S. or Canada today was an M 4.1 in the Unimak Island region, Alaska. It was not reported felt in this remote area. The last earthquake in the Unimak area with equal or larger magnitude was an M 4.7 on May 9. Forecast 124629 had expected today's event was likely within about 100 km of this epicenter around June 5.

 

O:  5JUN2020 05:06:34  53.9N  164.2W mb=4.1  EMSC   UNIMAK ISLAND REGION, ALASKA 

P:  5JUN2020 124629    54.2N  162.5W 3.5-5.0 AAAAA  Unimak Islands, Aleutians  

 

An M 3.3-3.6 aftershock in the Ridgecrest, California area was also felt today. NEIC reported intensity II-II for this event at Ridgecrest, Trona, Tehachape, Rosamond, California. Forecast 124564 had expected this activity was likely around June 5.

 

O:  4JUN2020 10:27:27  35.6N  117.4W ML=3.3  EMSC   SOUTHERN CALIFORNIA          

O:  4JUN2020 10:27:27  35.6N  117.4W ML=3.6  ANSS   SOUTHERN CALIFORNIA          

P:  5JUN2020 124564    35.8N  117.6W 2.5-4.6 AAAAA  So. California             

 

Another moderate earthquake occurred in the area where TC Amphan made landfall last week. Today's event is the largest in a series which has occurred  since that landfall event in northeastern India and Bangladesh.  Other such events occurred on May 29 and June 3 with M 4.5 and 4.2 and on May 28 in Bihar, India.

 

A light to moderate earthquake also accompanied landfall of a tropical cyclone in western Peninsular India today near Mumbai, India. Previous issues of this summary had expected moderate seismic enhancement with this storm as:

 

"A tropical cyclone may be forming west of Peninsular India.  Landfall occurred today near Mumbai, India may enhance seismicity in the regions of Pakistan, Iran and Afghanistan and India.

 

O:  5JUN2020 01:25:50  22.3N   86.8E ML=4.7  EMSC   HARKHAND - ORISSA REGION, INDI

P:  5JUN2020 124518    26.0N   93.0E 4.0-5.4 ACCAA  Myanmar                    

 

O:  5JUN2020 01:25:14  15.5N   78.1E ML=4.0  EMSC   ANDHRA PRADESH, INDIA        

 

MODERATE QUAKE SHAKES RIDGECREST, CALIFORNIA AFTER STRONG QUAKE IN NO. CHILE

 

EARTHQUAKE SUMMARY FOR JUNE 3, 2020

 

An earthquake of M 5.5 hit southeast of Ridgecrest, California today. NEIC reported it was felt with intensity V in Ridgecrest and Johannesburg, California IV in Trona and Inyokern and Fort Irwin and  II-III in Lone Pine, California City, Hinkley, Boron, and Weldon among others. This may be an aftershock of the events in the region of M 6.5 and 7.1 of July 4 and 6, 2019. It is the strongest aftershock within about 100 km of these mainshocks since an  immediate aftershock of M 5.5 on July 6, 2019. This summary had expected enhanced seismicity in the area at this time in the past two summaries as:

 

 

"The strongest earthquake in California today was an M 3.9 in Southern California south of the Ridgecrest aftershock zone.  NEIC reported this earthquake of M 3.9 in Southern California near Barstow  was felt with intensity II-III in the area(s) of Southern California near Barstow at Hinkley, Barstow, Boron, Fort Irwin, Helendale, Ridgecrest, California City, Newberry Springs, Edwards and Apple Valley. This summary noted the increase in seismic hazard in this area in the previous issue as:

 

"In California the aftershock activity in the Ridgecrest area appears to  be migrating to the southeast. A stronger aftershock near 35.6N 117.5W may be approaching. Two M 2.3 aftershocks hit this area today." (June 1-3, 2020)

 

The Ridgecrest area is at the fifth node (72 degrees) from the epicenter of an M 6.8 earlier in the day in northern Chile and may have been promoted by energy from that event. Forecast 124564 had expected a moderate aftershock was likely within about 25 km of this epicenter around June 5.

 

O:  4JUN2020 01:32:10  35.6N  117.4W Mw=5.5  EMSC   SOUTHERN CALIFORNIA          

O: 04JUN2020 04:37:45  35.6N  117.4W ML=3.2  EMSC   SOUTHERN CALIFORNIA

O: 04JUN2020 03:47:35  35.6N  117.4W Ml=3.1  EMSC   SOUTHERN CALIFORNIA

O: 04JUN2020 02:43:57  35.6N  117.4W ML=3.3  EMSC   SOUTHERN CALIFORNIA

O: 04JUN2020 02:07:26  35.6N  117.4W ML=3.2  EMSC   SOUTHERN CALIFORNIA

O: 04JUN2020 02:04:00  35.6N  117.4W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 04JUN2020 01:52:45  35.6N  117.4W ML=3.3  EMSC   SOUTHERN CALIFORNIA

P:  5JUN2020 124564    35.8N  117.6W 2.5-4.6 AAAAA  So. California             

 

Today's event of M 5.5 in the Ridgecrest aftershock zone was followed by a series of felt light aftershocks. It was also preceded by light earthquakes in Coso Junction (M 3.4) and in the western Nevada aftershock zone (M 3.6) and in southern Idaho (M 3.6). This last event was reported by NEIC to have been felt in western Nevada at Glenbrook with intensity II. The event near Coso Junction was reported with intensity IV in East Tulare County and Lone Pine, California. The aftershock in Idaho of M 3.6 was reported felt with intensity IV in Stanley, Idaho. Today's activation of Idaho, Nevada and California is probably related to the full moon which includes tidal stresses most active in western U.S. at this time and arrives tomorrow as previously noted in this summary:

 

"The full moon will arrive on June 5 at 19:12 UT. Areas which are sub-solar at this time are near 110 West and those anti-solar at 70 East longitude. These include western U.S. in the west and Central Asia in the East. Some enhanced seismicity in these areas is likely during the next five days. The passage of a near-earth asteroid near the same time (JPL# 163348) may enhance seismic effects." (June 1-2, 2020)

 

Forecasts 124528 and 124531 and 124589 had expected today's activity within about 25 km of these epicenters likely around June 4.

 

O:  3JUN2020 23:13:44  36.1N  118.0W ML=3.3  EMSC   CENTRAL CALIFORNIA           

O: 04JUN2020 02:27:54  36.2N  118.0W Mw=4.2  EMSC   CENTRAL CALIFORNIA

P:  4JUN2020 124528    36.3N  118.1W 2.5-4.6 AAAAA  California/Nevada area     

 

O:  4JUN2020 00:49:05  38.1N  118.0W ML=3.4  EMSC   NEVADA                       

P:  4JUN2020 124531    37.9N  118.2W 2.5-4.5 AAAAA  California/Nevada area     

 

O: 03JUN2020 16:30:45  44.1N  115.1W Ml=2.3  EMSC   SOUTHERN IDAHO

O: 03JUN2020 16:46:54  44.2N  115.1W ML=2.8  EMSC   SOUTHERN IDAHO

O: 03JUN2020 08:24:57  44.3N  114.9W ML=2.5  EMSC   SOUTHERN IDAHO

O: 03JUN2020 22:24:52  44.3N  115.0W Ml=4.0  EMSC   SOUTHERN IDAHO

O: 03JUN2020 19:34:56  44.3N  115.1W Ml=2.5  EMSC   SOUTHERN IDAHO

O: 03JUN2020 20:19:36  44.3N  115.1W Ml=2.7  EMSC   SOUTHERN IDAHO

O:  3JUN2020 15:28:51  44.4N  115.2W ML=2.5  EMSC   SOUTHERN IDAHO               

P:  4JUN2020 124589    44.5N  115.2W 2.0-4.2 AAAAA  Montana/Idaho               

 

The strongest earthquake in the world today was an M 6.8-6.9 in northern Chile. It was followed by an M 5.7 in Bali, Indonesia. GUC reported this earthquake was felt with intensity  V in  Arica and Parinacota at Arica  and San Miguel de Azapa; Tarapaca at Alto Hospicio, Iquique, La Tirana, Pica, El Los; IV in Huara, Pozo Almnte and III in Mamina; in Antofagasta with VI in Antofagasts, Calama, V in Baquedano, Maria Elena, Mejillones, Quillagua, Sierra Gorda and Tocopilla ; in Atacama with V in Chanaral, Diego de Almagro; IV in Caldera, Copiapo, Tierra Amarillo and II in Vallenar, Chile. Electrical service was disrupted in some of this area of Atacama. NEIC reported the Chilean quake was widely felt in Chile with intensity VI in Calama, Antofagasta; V in Antofagasta, Tocopilla, Iquique, and II-III in Copiapo, Arica and Ovalle. This and an  event of M 5.7 in Bali Indonesia and an M 6.8-7.1 in the Talaud Islands, June 4 were probably promoted by the strong geomagnetic storm several days ago as both lie within a couple of degrees of the geomagnetic equator. This was noted in previous issues of this summary when a similar pair of events hit the Talaud Islands of Indonesia following an M 6.1 in southern Peru as:

 

 

"That geomagnetic storm was associated with a strong earthquake of M 6.1 in Southern Peru and by an M 5.5 in the Talaud Islands, Indonesia as noted at the time in this summary:

 

"... epicenter is located on the geomagnetic equator. A series of moderate solar flares occurred yesterday and today including the largest of the year and first M-class flare of the year (M1.1 at 07:24 UT) and several C-class flares. These increased the disturbance in the geomagnetic field to storm levels. The combination of this disturbance and SFE (Solar Flare Effects) probably triggered the M 6.0 on the geomagnetic equator in Peru today which occurred at the peak of the disturbance within minutes local solar midnight, a time when geomagnetic effects are most prominent. Enhanced seismicity on or near the geomagnetic equator is likely to continue for several days as noted in this summary" (June 1, 3, 2020)

 

The earthquake of M 6.8-6.9 in northern Chile is the strongest in the world since a similar M 6.8-7.3 occurred in the Banda Sea of Indonesia on May 5, 2020. It is also the largest earthquake in northern Chile within about 250 km of today's epicenter since an M 6.7 on November 15, 2007, an aftershock of an M 7.7 the day prior. Forecast 124671 had expected a strong earthquake within about 50 km of this epicenter was likely around June 3. This epicenter is at 144 degrees from the M 7.3 in the Banda Sea of May 6, the last major earthquake in the world and was likely promoted by energy from that source.

 

O: 03JUN2020 16:09:18  23.1S   70.5W Mw=4.1  EMSC   ANTOFAGASTA, CHILE

O: 03JUN2020 07:35:33  23.3S   68.4W Mw=6.8  EMSC   ANTOFAGASTA, CHILE

O:  3JUN2020 07:35     23.2S   68.5W mb=6.9  GUC    Arica and Parinacota at Arica

O:  3JUN2020 07:50:31  23.4S   68.6W mb=4.6  EMSC   ANTOFAGASTA, CHILE           

P:  3JUN2020 124671    23.0S   69.0W 4.0-6.0 AAAAA  Coast No. Chile            

 

The earthquake of M 5.7-6.0 in Bali was the strongest in that region since an M 6.0 on October 10, 2018, possibly an aftershock of the M 6.9 that shook the area south of this on August 19, 2018. NEIC reported this earthquake of M 5.7 in the Bali Sea, Indonesia  was felt with intensity II-III in the area(s) of Bali at Denpasar (IV) and Ubud, Kuta and Banjarmasin Kalimantan, Selatan. BMG reported it was felt with intensity III in Bali at Denpasar, Kuta, Mataram, Lombok and II in Sumbawa, Indonesia. Forecast 124482 had expected this event to the southwest of today's epicenter in the region of Bali was possibly around June 4.

 

O:  3JUN2020 15:54:04   7.0S  116.9E Mw=5.7  EMSC   BALI SEA                      

P:  4JUN2020 124482     9.0S  114.0E 4.0-5.5 ABCAA  So. of Bali                

 

The M 6.4-7.1 in the Talaud region of Indonesia June 4 was reported by BMG to have been felt with intensity IV in Morotai; II-III in Manado, Bitung, Minahasa, Ternate, Sitaro, Tahuna, Talaud and Bolaang, Mongondow, Indonesia. The last earthquake recorded within about 250 km of this epicenter in the Talaud

Islands with M>=7.1 occurred on May 26, 2003 with M 7.0. Forecast 124462 had expected today's event was likely around June 9 within about 100 km of today's epicenter.  This epicenter is at 144 degrees from the M 7.7 off Cuba January 28, 2020 and was likely promoted by energy from that source.

 

O:  4JUN2020 03:18:12   2.6N  128.2E ML=4.2  EMSC   HALMAHERA, INDONESIA          

O:  4JUN2020 15:49:41   2.8N  128.1E mb=7.1  EMSC   KEPULAUAN TALAUD, INDONESIA  

O:  4JUN2020 15:49:41   2.8N  128.1E mb=7.1  BMG    KEPULAUAN TALAUD, INDONESIA  

P:  9JUN2020 124462     2.0N  129.0E 4.0-5.4 BAAAA  Halmahera                  

 

GEOMAGNETIC STORM; TIDAL STRESSES PROMOTE MODERATE SEISMICITY

 

EARTHQUAKE SUMMARY FOR JUNE 2, 2020

 

It was a quiet day in global seismicity. The only earthquake of M>=5 was an M 5.0 southwest of the South Sandwich Islands. This follows a similar M 5.0 northwest of the in the Georgia Island area yesterday and may have been promoted from stress redistribution from that event. The last earthquake within about 150 km of today's event with M>=5 was an M 5.3 on July 2, 2018; an M 5.3 on April 24, 2018 and an M 5.2 on February 12, 2013 after an 18-year quiet in the region following an M 5.6 and 5.7 in the Spring of 1995. Today's event may have been tidally promoted as it occurred within about an hour of local solar noon, or it may be related to the geomagnetic storm several days ago which would have promoted high latitude seismicity as noted in previous issues of this report:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field also  saw disturbed conditions  with AP at 17. This is the strongest disturbance in the geomagnetic field since AP reached 18 on April 20. Strong seismic enhancement is expected near the geomagnetic equator over the next several days." (May 30-31, 2020) 

 

That geomagnetic storm was associated with a strong earthquake of M 6.1 in Southern Peru and by an M 5.5 in the Talaud Islands, Indonesia as noted at the time in this summary:

 

"... epicenter is located on the geomagnetic equator. A series of moderate solar flares occurred yesterday and today including the largest of the year and first M-class flare of the year (M1.1 at 07:24 UT) and several C-class flares. These increased the disturbance in the geomagnetic field to storm levels. The combination of this disturbance and SFE (Solar Flare Effects) probably triggered the M 6.0 on the geomagnetic equator in Peru today which occurred at the peak of the disturbance within minutes local solar midnight, a time when geomagnetic effects are most prominent. Enhanced seismicity on or near the geomagnetic equator is likely to continue for several days as noted in this summary" (June 1, 2020)

 

and

 

"The full moon will arrive on June 5 at 19:12 UT. Areas which are sub-solar at this time are near 110 West and those anti-solar at 70 East longitude. These include western U.S. in the west and Central Asia in the East. Some enhanced seismicity in these areas is likely during the next five days. The passage of a near-earth asteroid near the same time (JPL# 163348) may enhance seismic effects." (June 1-2, 2020)

 

Forecast 124699 had expected today's activity in the South Sandwich Islands was

likely in early June to the east of today's epicenter.

 

O:  2JUN2020 12:48:39  61.6S   29.1W mb=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  7JUN2020 124699    61.0S   26.0W 4.0-5.4 BABAA  Southern  Ocean            

 

A second moderate earthquake hit Bangladesh today in the area where the landfall of TC Amphan occurred last week. Today's event was reported felt with intensity V in Dacca, Bangladesh. An M 4.5 hit the area about 200 km west of this on May 29 and an M 4.5 and M 4.2 shook the region on January 27 and February 24. Forecasts 124518 head expected today's activity was likely around June 5.

 

O:  3JUN2020 01:40:49  24.9N   91.1E mb=4.2  EMSC   INDIA-BANGLADESH BORDER REGION

P:  5JUN2020 124518    26.0N   93.0E 4.0-5.4 ABBAA  Myanmar                    

 

The strongest earthquake in the U.S. or Canada today was an M 4.0  in the Northwest Territory of Canada near Fort Good Hope. It was not reported felt in this remote area. The last earthquake of M>=4 within about 200 km of this epicenter was an M 4.0 on March 21, 2019 but the last of larger magnitude in this area was an M 5.0 on December 22, 2017. Forecast 124643 had expected today's event in this area was likely in early June.

 

 

O:  2JUN2020 22:54:33  65.5N  131.8W MB=4.0  ECAN OF FORT GOOD HOPE, NT          

P:  7JUN2020 124643    64.0N  133.0W 2.5-4.3 BBAAA  Yukon Territory, Canada    

 

The strongest earthquake in California today was an M 3.9 in Southern California south of the Ridgecrest aftershock zone.  NEIC reported this earthquake of M 3.9 in Southern California near Barstow  was felt with intensity II-III in the area(s) of Southern California near Barstow at Hinkley, Barstow, Boron, Fort Irwin, Helendale, Ridgecrest, California City, Newberry Springs, Edwards and Apple Valley.  This summary noted the increase in seismic hazard in this area in the previous issue as:

 

"In California the aftershock activity in the Ridgecrest area appears to  be migrating to the southeast. A stronger aftershock near 35.6N 117.5W may be approaching. Two M 2.3 aftershocks hit this area today." (June 1-2, 2020)

 

Forecasts 124564 and 124562 had expected enhanced seismicity in this region

was likely around June 5-7.

 

O:  3JUN2020 04:36:23  35.2N  117.2W Mw=3.9  EMSC   SOUTHERN CALIFORNIA          

P:  5JUN2020 124564    35.8N  117.6W 2.5-4.6 AAAAA  So. California             

P:  7JUN2020 124562    35.0N  117.7W 2.5-4.6 BAAAA  So. California             

MODERATE QUAKE IN SOUTH GEORGIA ISLAND REGION

 

EARTHQUAKE SUMMARY FOR JUNE 1, 2020

 

The strongest earthquake in the world today was an M 5.0 in the area of South Georgia Island, west of the South Sandwich Islands. An M 5.0-5.1 hit the South Georgia Island region on October 3 and February 17, 2019 but the last of larger magnitude in the area was an M 5.4 on December 12, 2018. These were all about 200 km to the east near the South Sandwich Islands. Today's event is the furthest to the west in the area since an M 5.0 on December 12, 2007 and an M 5.0 on December 7, 2002. Forecast 124699 had expected today's activity to the east around June 6.

 

O:  2JUN2020 00:30:34  55.0S   33.0W mb=5.0  EMSC   SOUTH GEORGIA ISLAND REGION  

P:  6JUN2020 124699    55.0S   29.0W 4.0-5.7 BACAA  So. Sandwich Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in the Alaska Peninsula. It is part of a recent series of events in this area but was not felt in the epicentral region. The most recent of these was an M 4.1 on May 30, 2020. Forecast 124612 had expected today's event was likely in early June.

 

 

O:  1JUN2020 07:15:02  56.5N  155.0W mb=3.9  EMSC   ALASKA PENINSULA             

P:  5JUN2020 124612    56.5N  157.7W 3.5-5.2 BABAA  Alaska Peninsula           

 

An asteroid of 250-510 meters diameter (JPL # 163348) will be passing about 3 million km from earth on June 6 with closest approach about 3:20 UT. This coincides with the full moon and may help to promote seismicity at this time. As this develops this summary will report further as noted below:

 

"The full moon will arrive on June 5 at 19:12 UT. Areas which are sub-solar at this time are near 110 West and those anti-solar at 70 East longitude. These include western U.S. in the west and Central Asia in the East. Some enhanced seismicity in these areas is likely during the next five days. The passage of a near-earth asteroid near the same time (JPL# 163348) may enhance seismic effects." (June 102, 2020)

 

In California the aftershock activity in the Ridgecrest area appears to be migrating to the southeast. A stronger aftershock near 35.6N 117.5W may be approaching. Two M 2.3 aftershocks hit this area today.

 

O: 01JUN2020 09:24:14  35.6N  117.5W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 02JUN2020 01:19:56  35.9N  117.7W ML=2.0  EMSC   CENTRAL CALIFORNIA

O: 02JUN2020 03:07:57  36.1N  117.9W ML=2.0  EMSC   CENTRAL CALIFORNIA

O:  2JUN2020 03:31:14  35.6N  117.5W ML=2.3  EMSC   SOUTHERN CALIFORNIA          

P:  5JUN2020 124564    35.8N  117.6W 2.5-4.6 BAAAA  So. California             

 

MODERATE QUAKES CONTINUE IN SOUTHWEST PACIFIC; HONSHU, JAPAN

 

EARTHQUAKE SUMMARY FOR MAY 31, 2020

 

The strongest earthquake in the world today was an M 5.7 in the Fiji Islands.

This event was not reported felt in this remote area. It continue regional activation which followed the landfall of TC Amphan last week in Pakistan. The area is at about 103 degrees from that landfall and was probably promoted by energy from that event. Similar events have occurred in the area in the last several days with M 5.8-6.1 in the Kermadec Islands, Tonga, Fiji and with lesser magnitude in North Island, New Zealand  - all near 103 degrees from the Amphan landfall. Forecast 124431 had expected this activity within about 100 km of this epicenter was likely around May 25.

 

O: 31MAY2020 23:25:39  23.9S  176.7W Mw=5.7  EMSC   SOUTH OF FIJI ISLANDS        

P: 25MAY2020 124431    23.0S  176.0W 4.0-5.6 CAAAA  Tonga Islands              

 

The second strongest earthquake in the world today was an M 5.3 near the east coast of Honshu, Japan. NEIC reported this earthquake of M 5.2 north of Tokyo, Japan  was felt with intensity II-III in the area(s) north of Tokyo, Japan with V in Ibaraki and Iwate and IV in Tochigi, Japan and II-III in Chiba and Tokyo.  This continues a series of moderate quakes in the area near Tokyo in the past four months which have included an M 5.8 on May 10; an M 5.6 on May 4 and an M 5.3 on February 6, 2020. Forecast 124336 had expected today's activity was likely around May 29.

 

O: 31MAY2020 21:02:10  36.2N  140.4E Mw=5.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 29MAY2020 124336    38.0N  143.0E 4.0-5.5 ABBAA  So. of Honshu              

 

An earthquake of M 4.7 hit northern Haiti today. NEIC reported it was felt with intensity VII in Northern Haiti at Limbe and IV in Cap-Hatien and II-III in Haiti at Gonaives, Castanuelas, Vieus-Bouorg-d Aoquin. This is the strongest earthquake in Haiti since an M 5.9 mainshock and an M 5.4 aftershock on October 7, 2018. Forecast 124284 had expected today's event to the east was likely around May 27.

 

O: 31MAY2020 18:44:50  19.9N   72.6W ML=3.4  EMSC   HAITI REGION                 

O: 31MAY2020 07:44:24  20.0N   72.4W mb=4.7  EMSC   HAITI REGION                 

P: 27MAY2020 124284    20.0N   71.0W 3.0-4.5 BABAA  Bahamas/No. Caribbean      

 

Light to moderate seismicity also continued today in the regions of Puerto Rico and the Virgin Islands. NEIC reported an earthquake of M 3.9 in Southern Puerto Rico  was felt with intensity II-III in the area(s) of Southern Puerto Rico at Ponce (V) and Guayanilla and Coto Laurel (IV) and Guanica, Juana Diaz, Albonito and Bayamon. Forecast 124280 had expected this activity within about 25 km was likely around May 28.

 

O: 31MAY2020 16:47:07  17.9N   66.8W ML=3.9  EMSC   PUERTO RICO REGION

O: 01JUN2020 05:27:34  17.9N   66.8W Md=3.0  EMSC   PUERTO RICO REGION

O: 01JUN2020 04:27:07  17.9N   66.8W Md=3.2  EMSC   PUERTO RICO REGION

O:  1JUN2020 05:16:10  17.9N   66.8W ML=3.4  EMSC   PUERTO RICO REGION           

P: 28MAY2020 124280    18.0N   67.0W 3.4-5.0 BAAAA  Puerto Rico                

 

NEIC also reported earthquakes of M 3.8 and M 3.9 in the Virgin Islands were felt with intensity II-III in the area(s) of the Virgin Islands at Saint Thomas, Culebra, Saint John (IV), Road Town and Frederiksted.  Forecast 124269 had expected this activity within about 25 km was likely around May 28.

 

O: 31MAY2020 19:56:31  18.6N   65.1W ML=3.4  EMSC   VIRGIN ISLANDS REGION

O: 31MAY2020 19:56:31  18.6N   65.1W ML=3.8  ANSS   VIRGIN ISLANDS REGION

O: 31MAY2020 17:46:12  19.2N   65.0W ML=3.9  ANSS   VIRGIN ISLANDS REGION        

O: 31MAY2020 17:46:12  19.2N   65.0W ML=3.4  EMSC   VIRGIN ISLANDS REGION        

P: 29MAY2020 124269    19.0N   65.0W 3.0-5.1 AAAAA  Leeward Islands            

 

An M 4.0 earthquake occurred in the Southern Idaho aftershocks zone today.

NEIC reported this earthquake of M 4.0 in Southern Idaho  was felt with intensity II-III in the area(s) of Southern Idaho in Lowman, Stanley, Garden Valley, Hailey, Garden City, Boise.  This is an aftershock of the M 6.5 in the area of March 31, 2020. Six events of M>=4 have hit the area since the mainshock, the last of which was an M 4.4 on May 21, 2020. Forecast 124359 had expected today's event around May 27.

 

O: 31MAY2020 22:51:22  44.1N  115.1W Ml=3.1  EMSC   SOUTHERN IDAHO

O: 31MAY2020 16:52:05  44.1N  115.1W mb=4.0  EMSC   SOUTHERN IDAHO

O: 31MAY2020 15:09:18  44.3N  115.0W ML=2.3  EMSC   SOUTHERN IDAHO

O: 01JUN2020 05:21:53  44.3N  115.0W Ml=2.7  EMSC   SOUTHERN IDAHO

O: 31MAY2020 16:28:33  44.3N  115.2W Ml=2.3  EMSC   SOUTHERN IDAHO

O: 31MAY2020 08:22:12  44.3N  115.2W Ml=2.8  EMSC   SOUTHERN IDAHO

O: 31MAY2020 23:05:35  44.5N  115.2W Ml=2.4  EMSC   SOUTHERN IDAHO

O: 31MAY2020 17:32:17  44.1N  115.1W Ml=2.9  EMSC   SOUTHERN IDAHO               

P: 27MAY2020 124359    44.4N  115.1W 2.0-4.1 BAAAA  Montana/Idaho              

 

M 6.0 IN SOUTHERN PERU PROBABLY PROMOTED BY GEOMAGNETIC/SOLAR FLARE EFFECTS

 

EARTHQUAKE SUMMARY FOR MAY 30, 2020

 

The strongest earthquake in the world today occurred as an M 5.9-6.1 in Southern Peru. NEIC reported it was felt with maximum intensity V in Puno, Peru at Lampa, Torata, Yunguyo, and IV in Juliaca, Puno, Moquegua, and Mollendo and II-III in Camana, Cusco, and Arequipa. GUC reported this earthquake was felt with intensity  IV in Chile at   Arica and Parinacota at Arica and Cuya; III in Pocon, Chile; in Tarapaca with IV in Alto Hospicio, Huara, Iquique, V in La Tirana, Pisagua and Ujina and III in Camina, Mamina, Pica, and in Quillagua, Antofagasta with III, Chile. This epicenter is located on the geomagnetic equator. A series of moderate solar flares occurred yesterday and today including the largest of the year and first M-class flare of the year (M1.1 at 07:24 UT) and several C-class flares. These increased the disturbance in the geomagnetic field to storm levels. The combination of this disturbance and SFE (Solar Flare Effects) probably triggered the M 6.0 on the geomagnetic equator in Peru today which occurred at the peak of the disturbance within minutes local solar midnight, a time when geomagnetic effects are most prominent. Enhanced seismicity on or near the geomagnetic equator is likely to continue for several days as noted in this summary:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field also  saw disturbed conditions  with AP at 17. This is the strongest disturbance in the geomagnetic field since AP reached 18 on April 20. Strong seismic enhancement is expected near the geomagnetic equator over the next several days." (May 30-31, 2020) 

 

The M 5.9-6.1 was preceded by a foreshock of M 4.0 earlier in the day to the west of the mainshock epicenter.  The last earthquakes of M>=5.9 within about 200 km of today's epicenter occurred as an M 7.0 on March 1, 2019 and an M 6.3 on December 1, 2016. Forecasts 124410 and 124416 had expected today's activity was likely around May 20 in this area.

 

O: 31MAY2020 05:09:35  15.4S   70.6W Mw=5.9  EMSC   SOUTHERN PERU                

O: 31MAY2020 05:09     15.8S   71.2W mb=6.1  GUC    Arica and Parinacota at Arica

O: 30MAY2020 09:57:51  15.7S   71.7W ML=4.0  EMSC   SOUTHERN PERU                

P: 29MAY2020 124410    15.0S   73.0W 4.0-5.6 AAAAA  Central Peru               

P: 29MAY2020 124416    16.0S   74.0W 4.0-5.5 AABAA  So. Peru/Bolivia           

 

The second largest earthquake of the day was an M 5.5 in the Talaud Islands of Indonesia. Like the event in Peru, it occurred on the geomagnetic equator and was probably enhanced by the geomagnetic storm which peak was simultaneous with the quake. It was not reported felt. This is the strongest earthquake in the Talaud Islands since an M 6.0 on February 6, 2020 and prior to that an M 5.5 on December 5, 2019. Forecast 124235 expected today's event was likely around May 31 to the west of today's epicenter.

 

O: 30MAY2020 13:06:25   4.1N  126.5E Mw=5.5  EMSC   KEPULAUAN TALAUD, INDONESIA  

O: 30MAY2020 13:06:24   4.0N  126.6E Mw=5.5  ANSS   KEPULAUAN TALAUD, INDONESIA  

P: 31MAY2020 124235     4.0N  125.0E 4.0-5.7 AABAA  Mindanao, Philippines      

 

The largest earthquake in the U.S. or Canada today was an M 4.3 in the aftershock area near Mammoth Lakes, California. NEIC reported this quake was felt with intensity II-III in California at Lee Vining, June Lake, Mammoth Lakes, Yosemite National Park, Coleville, Bishop, El Portal and Mariposa and in Nevada at Yerington and Hawthorne. This is the strongest event in this swarm north of Mammoth Lakes, California since an M 4.6 on May 15, 2020 at the start of this swarm. The strongest quakes in the swarm to date have been M 4.3-4.4. A stronger shock hit the area with M 5.2 on April 11, 220, the largest in the region since December 28, 2016 when an M 5.5-5.6 occurred.  Today's activity occurred at the peak of the geomagnetic storm and may have been promoted by SFE. Forecasts 124301 and 124303 had expected this activity was likely around May 27-30.

 

O: 31MAY2020 01:37:18  38.0N  118.8W ML=3.0  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 09:07:32  38.0N  118.8W ML=3.4  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 09:22:57  38.0N  118.8W ML=3.4  EMSC   CENTRAL CALIFORNIA

O: 31MAY2020 01:24:32  38.1N  118.8W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 31MAY2020 01:07:15  38.1N  118.8W Mw=4.3  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 17:17:05  38.0N  118.8W ML=2.9  EMSC   CENTRAL CALIFORNIA           

P: 27MAY2020 124303    38.2N  118.8W 2.5-4.5 BAAAA  California/Nevada area     

P: 30MAY2020 124301    37.4N  118.6W 2.5-4.4 AAAAA  California/Nevada area     

 

An unusual swarm of light earthquakes also occurred today in the area west of Bakersfield, California. These ranged up to M 2.4 and was the strongest swarm in the area since November 21, 2019 when an M 3.2 occurred northwest of this. Forecast 124329 had expected this activity to the east at the end of May.

 

O: 31MAY2020 02:30:30  35.5N  119.7W ML=2.2  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 11:35:46  35.5N  119.7W ML=2.4  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 14:33:03  35.5N  119.7W ML=2.6  ANSS   CENTRAL CALIFORNIA

O: 30MAY2020 14:33:03  35.5N  119.7W ML=2.4  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 11:04:27  35.5N  119.7W Ml=2.2  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 10:42:26  35.5N  119.8W ML=2.3  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 11:59:14  35.5N  119.8W Ml=2.1  EMSC   CENTRAL CALIFORNIA

O: 30MAY2020 12:16:53  35.5N  119.7W ML=2.1  EMSC   CENTRAL CALIFORNIA           

P: 27MAY2020 124329    35.0N  119.2W 2.5-4.5 BAAAA  So. California             

P: 31MAY2020 124329    34.7N  119.0W 2.5-4.6 AAAAA  So. California             

 

An M 3.9 also shook regions of Hawaii today. This is the strongest shaker in  Hawaii since an similar M 3.9 in the Loi'hi area south of the island on May 11 and the strongest within Hawaii since an M 4.2 on April 12, 2020 and February 3, 2020, the only such events in the past six months at this magnitude level. NEIC reported this earthquake of M 3.9 in Hawaii  was felt with intensity II-III in the area(s) of Hawaii at Naalehu, Volcano, Captain Cook, Hilo, Kamuela, and Honokaa. Forecast 124289 had expected today's event within about 25 km was likely at the end of May.

 

O: 31MAY2020 05:34:57  19.2N  155.4W ML=3.9  EMSC   ISLAND OF HAWAII, HAWAII     

O: 30MAY2020 15:33:17  19.4N  155.6W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII     

P: 26MAY2020 124289    19.4N  155.1W 4.0-5.4 BAAAA  Hawaii area                

 

 

 

 

 

 

SEISMIC SWARM IN NORTHERN MID-ATLANTIC

 

EARTHQUAKE SUMMARY FOR MAY 29, 2020

 

The strongest seismicity in the world today occurred in the Northern Mid-Atlantic Ridge. These events of M 5.6, 5.4, 5.1 and 4.6 were not reported felt in this remote mid-ocean ridge. This is the strongest activity within about 200 km of this epicenter since a similar M 5.6 14 years ago on August 9, 2007. Forecast 124291 had expected today's activity at the end of May. This activity is at 103 degrees from the M 7.6 in the Kurils of March 25, 2020, the last major earthquake in the world. It was probably promoted by concentrated energy  from that source. Puerto Rico, another area of high seismicity in recent months is at a similar distance from the Kuril Islands.

 

O: 30MAY2020 03:51:48  25.9N   45.0W Mw=5.1  EMSC   NORTHERN MID-ATLANTIC RIDGE

O: 30MAY2020 03:29:32  25.9N   45.0W Mw=5.4  EMSC   NORTHERN MID-ATLANTIC RIDGE

O: 30MAY2020 03:21:51  25.9N   45.0W Mw=5.6  EMSC   NORTHERN MID-ATLANTIC RIDGE

O: 30MAY2020 03:46:12  25.9N   44.9W mb=4.6  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 24MAY2020 124291    23.0N   45.0W 4.0-5.7 CCAAA  Mid-Atlantic Ridge         

 

The strongest earthquake in the U.S. or Canada today was an M 4.0-4.1 aftershock in eastern Nevada. It was lightly felt in the Tonopah, Nevada area. The M 4.0 was preceded several hours earlier by an M 3.6-3.9. The last aftershock of larger magnitude was an M 4.2 on May 27, 2020. Forecast 124302 had expected today's activity was likely around May 29.

 

O: 29MAY2020 20:45:38  38.2N  117.7W ML=3.6  EMSC   NEVADA

O: 29MAY2020 20:45:38  38.2N  117.7W ML=3.9  ANSS   NEVADA

O: 29MAY2020 15:03:40  38.2N  117.9W ml=3.1  EMSC   NEVADA

O: 29MAY2020 13:25:32  38.2N  117.7W ml=3.1  EMSC   NEVADA

O: 29MAY2020 23:43:42  38.2N  118.0W ML=3.7  EMSC   NEVADA                       

O: 29MAY2020 23:43:42  38.2N  118.0W ML=4.0  ANSS   NEVADA                       

P: 29MAY2020 124302    38.0N  117.9W 2.5-4.5 AAAAA  California/Nevada area     

 

An M 4.1 also occurred in the Alaska Peninsula today. A similar M 4.4 hit the area  about 150 km east of this on May 23 and an M 4.1 on May 17. The only other such event in the area in the past six months was an M 4.7 on February 17, 2020. Forecast 124158 had expected the area would be active at the end of May.

 

O: 30MAY2020 04:09:05  56.7N  156.1W mb=4.1  EMSC   ALASKA PENINSULA             

P: 21MAY2020 124158    54.8N  158.7W 3.5-5.0 CBBAA  Alaska Peninsula           

 

A swarm of light earthquakes also occurred in the Yellowstone National Park area today. The area has been quiet since the M 6.5 in Idaho triggered a swarm in Yellowstone on March 31, 2020. The last an only earthquakes in Yellowstone this year were an M 2.9 on March 31 and an M 2.6 on January 10, 2020. Forecast 124376 had expected today's activity within about 25 km was likely around May 26.

 

O: 29MAY2020 10:39:06  44.7N  110.8W ML=2.5  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 09:15:07  44.7N  110.8W Ml=2.1  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 11:37:46  44.7N  110.8W Ml=2.1  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 09:54:52  44.7N  110.8W Ml=2.2  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 11:11:18  44.7N  110.8W Ml=2.2  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 10:42:06  44.7N  110.8W Ml=2.3  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 09:45:36  44.7N  110.8W Ml=2.4  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29MAY2020 10:40:10  44.7N  110.8W Ml=2.5  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 26MAY2020 124376    44.4N  110.8W 2.0-4.1 BAAAA  Yellowstone/Wyoming        

 

MODERATELY STRONG QUAKE IN KERMADEC ISLANDS, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR MAY 28, 2020

 

A moderately strong earthquake of M 5.8 in the Northern Kermadec Islands of New Zealand today completed the set of such events in the area which followed landfall of TC Amphan last week. It also followed an M 5.9 to the north in the Tonga Islands, yesterday. This summary had expected this activity as:

 

"TC Amphan (01B) continued today in the area south of Pakistan with winds up to 105 kts as a major cyclone. This is the strongest cyclone ever recorded in this area of the Bay of Bengal. It is expected to track to the north possibly affect seismicity in Bangladesh, eastern Pakistan and central and southeastern Asia in the next week. The antipode of the expected landfall is a about 21S 92W in the South Pacific - a non-seismic region. Areas at 144 degrees from the expected landfall include Mexico and Guatemala, those near 103 degrees include areas off Washington State and the Kermadec Islands. These may see seismic enhancement with landfall of this powerful storm." (May 18-20, 2020)

 

and reviewed the  progress to date in the previous issue of this summary as:

 

"A series of moderate earthquakes continued today in the Southwestern Pacific.

These included an M 5.9 in Tonga, an M 6.1 in Vanuatu and several moderate aftershocks; events in Fiji (M 4.3, 4.5) and in north and South Island, New Zealand of M 4.0 and 4.5. This activity is located at 101-104 degrees from the landfall of TC Amphan in Bangladesh late last week." (May 28-29, 2020)

 

Today's M 5.8 in the northern Kermadec Islands is the strongest event within about 200 km of this epicenter in the Kermadec Islands since an M 6.3 on March 14, 2020 and an M 5.8 on January 10, 2019. Prior to that the area had been quiet at this magnitude level for more than 30 years.  It was not felt in this remote area. Forecast 124432 expected this event in this area was likely around May 29. This epicenter is at 103.0 degrees from the Amphan landfall location and was probably promoted by energy from that event.

 

O: 28MAY2020 09:46:48  27.7S  174.9W Mw=5.8  EMSC   KERMADEC ISLANDS REGION      

P: 29MAY2020 124432    27.0S  177.0W 4.0-5.7 AABAA  Tonga Islands              

 

The Kermadec quake followed an M 5.9 in Tonga. The last earthquake in the region of Tonga within about 200 km of this epicenter with M>=5.9 was recorded nearly a year ago on June 2 and June 15, 2019 with M 5.9 and 6.1. Forecast 124430 had expected today's activity was likely around May 30 in this area. This epicenter in Tonga is at 104 degrees from the landfall of TC Amphan of May 22 and was probably enhanced by energy from that event.

 

O: 28MAY2020 07:18:44  22.3S  174.4W Mw=5.9  EMSC   TONGA REGION                 

P: 30MAY2020 124430    21.0S  175.0W 4.0-5.8 ABAAA  Tonga Islands              

 

Moderate earthquakes today accompanied the M 5.8 in the Kermadec Islands in the central and southern Kermadecs and in North and South Islands, New Zealand.

 

O: 28MAY2020 17:19:30  31.6S  179.9E mb=4.2  EMSC   KERMADEC ISLANDS REGION      

P: 28MAY2020 124439    30.0S  179.0E 4.0-5.6 ABAAA  No. Kermadec Islands       

 

O: 29MAY2020 00:05:27  35.2S  180.0E ML=4.1  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 31MAY2020 124440    35.0S  179.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

O: 28MAY2020 08:33:26  40.5S  175.0E ML=4.2  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 25MAY2020 124446    40.0S  175.0E 3.0-4.6 BAAAA  North Island, N.Z.         

 

Triggering of seismicity by stresses from TC Amphan was not limited to the Tonga-Kermadec-New Zealand arc today. Two moderate earthquakes also occurred in the immediate area where landfall occurred in Bangladesh and northeastern India with M 4.5 and 4.8. In particular an M 4.5 in Bangladesh at the landfall site of Amphan probably was a product of delayed triggering from stresses associated with Amphan. It is the strongest quake in the landfall area since an M 5.3 on September 12, 2018. Forecast 124292 had expected this activity was likely at the end of May.

 

O: 29MAY2020 02:47:44  24.5N   89.9E ML=4.5  EMSC   BANGLADESH                   

P: 24MAY2020 124292    27.0N   92.0E 4.0-5.5 BCBAA  Myanmar                    

 

The M 4.8 about 500 km in the Bihar, India area northwest of the Bangladesh epicenter was the strongest within about 200 km of that epicenter since an M 5.0 on February 15, 1993. Forecast 124346 had expected regional seismicity at the end of May.

 

O: 28MAY2020 08:40:27  25.7N   85.5E ML=4.8  EMSC   BIHAR, INDIA                 

P: 28MAY2020 124346    31.0N   88.0E 3.8-5.4 ACBAA  Xizang                     

 

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in the aftershock area of western Nevada. An M 4.2 occurred in this area on May 27, the last at this magnitude level in the aftershock zone. Forecast 124302 had expected elevated regional seismicity around May 29.

 

O: 28MAY2020 08:29:46  38.2N  118.0W mb=3.9  EMSC   NEVADA                       

O: 28MAY2020 20:44:31  38.1N  118.1W ml=3.0  EMSC   NEVADA

O: 28MAY2020 18:45:35  38.2N  117.8W ml=3.2  EMSC   NEVADA

O: 28MAY2020 12:03:21  38.2N  117.7W ML=3.1  EMSC   NEVADA

P: 29MAY2020 124302    38.0N  117.9W 2.5-4.5 AAAAA  California/Nevada area     

 

An unusual earthquake today was an M 3.5 in the Labrador Sea off Newfoundland, Canada. This is the strongest event recorded within  about 250 km of this epicenter since an M 3.8 on May 17, 2008. Forecast 124394 had expected today's event in this region to the northeast of today's epicenter was likely around May 29.

 

O: 28MAY2020 14:48:49  58.3N   60.2W MB=3.6  ECAN Nutak, NL                      

O: 28MAY2020 14:48:49  58.3N   60.2W ML=3.6  EMSC   LABRADOR SEA                 

P: 29MAY2020 124394    61.0N   58.0W 2.5-4.1 ACBAA  Baffin/Davis Strait Canada 

 

 

 

 

 

 

 

 

 

SEISMIC ACTIVATION CONTINUES IN SOUTHWESTERN PACIFIC

 

EARTHQUAKE SUMMARY FOR MAY 27, 2020

 

A series of moderate earthquakes continued today in the Southwestern Pacific.

These included an M 5.9 in Tonga, an M 6.1 in Vanuatu and several moderate aftershocks; events in Fiji (M 4.3, 4.5) and in north and South Island, New Zealand of M 4.0 and 4.5. This activity is located at 101-104 degrees from the landfall of TC Amphan in Bangladesh late last week. More such activity is expected in the area in the next several days before the effects of Amphan have dissipated. The strongest earthquake in the world today was an M 5.9 in Tonga north of the Kermadec Islands. NEIC reported it was felt with intensity II-III in Tonga at Tofoa-Koloua and Nuku'alofa. This continues seismic enhancement in the region of New Zealand, the Vanuatu Islands and Tonga which apparently was triggered by energy associated with landfall of TC Amphan in Bangladesh late last week. This summary had expected this as:

 

"TC Amphan (01B) continued today in the area south of Pakistan with winds up to 105 kts as a major cyclone. This is the strongest cyclone ever recorded in this area of the Bay of Bengal. It is expected to track to the north possibly affect seismicity in Bangladesh, eastern Pakistan and central and southeastern Asia in the next week. The antipode of the expected landfall is a about 21S 92W in the South Pacific - a non-seismic region. Areas at 144 degrees from the expected landfall include Mexico and Guatemala, those near 103 degrees include areas off Washington State and the Kermadec Islands. These may see seismic enhancement with landfall of this powerful storm." (May 18-20, 2020)

 

The last earthquake in the region of Tonga within about 200 km of this epicenter with M>=5.9 was recorded nearly a year ago on June 2 and June 15, 2019 with M 5.9 and 6.1. Forecast 124430 had expected today's activity was likely around May 30 in this area. This epicenter in Tonga is at 104 degrees from the landfall of TC Amphan of May 22 and was probably enhanced by energy from that event.

 

O: 28MAY2020 07:18:44  22.3S  174.4W Mw=5.9  EMSC   TONGA REGION                 

P: 30MAY2020 124430    21.0S  175.0W 4.0-5.8 ABAAA  Tonga Islands              

 

O: 27MAY2020 10:29:23  17.6S  180.0E mb=4.3  EMSC   FIJI                          

O: 27MAY2020 15:41:49  18.0S  178.4W mb=4.5  EMSC   FIJI REGION                  

P: 26MAY2020 124418    18.0S  178.0W 4.0-5.6 AAAAA  Tonga Islands              

 

An M 5.1 in the Kermadec Islands area of New Zealand is the strongest within about 200 km of that event in the Kermadec Islands since an M 6.0 a month ago on April 14, 2020 and appears to be an aftershock of that mainshock. It was not reported felt in this remote area. Forecast 124443 had expected today's activity in this area was likely around May 28. This epicenter is  located at 103 degrees from the landfall of TC  Amphan and may have been  promoted by energy from that event.

 

O: 27MAY2020 10:26:47  31.4S  178.4W mb=5.1  EMSC   KERMADEC ISLANDS REGION      

P: 28MAY2020 124443    31.0S  177.0W 4.0-5.6 AAAAA  So. Kermadec Islands       

 

O: 27MAY2020 10:32:59  39.8S  172.8E ML=4.0  EMSC   OFF W. COAST OF N. ISLAND, N.Z

P: 27MAY2020 124440    39.0S  174.0E 3.0-4.4 AAAAA  North Island, N.Z.         

 

GEONET reported the event in South Island was felt with moderate intensity in northern South Island. 308 people reported feeling this event; 208 with weak intensity; 87 with light shaking; 12 moderate; 1 strong; 0 with severe and 0 with extreme shaking. The last event with M>=4.5 within about 100 km of this epicenter occurred on  Forecast 124448 had expected today's event within about 15 km of the epicenter was likely around May 27.  This epicenter is located at 102 degrees from the landfall of TC  Amphan and may have been  promoted by energy from that event.

 

O: 27MAY2020 14:43:21  41.9S  172.9E ML=4.5  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 27MAY2020 14:43:21  41.9S  172.9E ML=4.5  GEONET Felt with moderate intensity

P: 27MAY2020 124448    42.0S  173.0E 3.0-5.2 AAAAA  So. Island, N.Z.           

 

An M 5.1 was widely felt in Luzon, Philippines today. NEIC reported maximum intensity V in Ilogon and Bued and Alaminos and II-III in Catabian, Lingayen, Banagang, Concepcion, Paringao, Ilocos, San Fernando, Baguio (IV) and Tuding, Cordillera, Philippines.  PHIVOLCS reported it was felt with intensity IV in San Fernando, Caba and Balaoan, La Union; Labrador and Bolinao, Pangasinan, Dagupan City; III in Urdaneta City and Villasis, Pangasinan; Baguio City; Quezon City; Marikina City, Obando, Bulacan; and II in Cainta, Rizal; San Fernando, Pampanga; Valenzuela City; Navotas City; Pasay City; Paranaque City, City of Manila and City of San Jose Del Monte, Bulacan. This is first event of M>=5.1 in Luzon, Philippines within about 200 km of this epicenter since an M 5.4 more than a year ago on February 6, 2019 (M 5.4) and before that an M 5.3 on May 25, 2017. Forecast 124270 had expected activity in Luzon around May 26 to the south of today's epicenter.

 

O: 28MAY2020 05:17:31  16.6N  120.4E Mw=5.1  EMSC   LUZON, PHILIPPINES           

P: 26MAY2020 124270    13.0N  121.0E 3.5-4.9 ACAAA  Luzon, Philippines         

 

The second largest earthquake in the world today was an M 5.4 in the South Indian Ocean area.  This event is within about 100 km of the exact antipode of the M 6.1 in the Southern Baja California area of May 21 as noted when several similar events in the South Indian Ocean area occurred on May 23: An M 5.7 occurred a month ago at this epicenter on April 17.

 

O: 27MAY2020 21:09:11  23.7S   69.6E mb=5.4  EMSC   MID-INDIAN RIDGE             

 

 

".. mid-ocean activity of note today was a series of events in the southern Indian Ocean including an M 5.6. This activity is near the antipode of the M 6.1 in Baja California, Mexico which occurred yesterday and may have been promoted by antipodal concentration of energy from that event." (May 24, 2020)

 

An earthquake of M 3.1-3.4 shook areas south of San Francisco, California today. NEIC reported it was felt with intensity II-III in Central California at Aromas, San Juan Bautista, Salinas, Watsonville, Gilroy, Castroville, Manna, Capitola and Morgan Hill. The last earthquake of M>=3.4 within about 50 km of this epicenter was an M 3.7 on February 13, 2020. Forecast 124307 had expected today's event in this region was likely around May 25-27.

 

O: 27MAY2020 15:56:36  36.7N  121.2W Md=2.8  EMSC   CENTRAL CALIFORNIA

O: 28MAY2020 06:09:07  36.9N  121.6W Md=2.2  EMSC   CENTRAL CALIFORNIA

O: 27MAY2020 17:01:59  36.9N  121.8W ML=3.1  EMSC   CENTRAL CALIFORNIA           

O: 27MAY2020 17:02:01  36.9N  121.6W ML=3.4  ANSS   CENTRAL CALIFORNIA           

P: 25MAY2020 124307    36.7N  121.4W 2.5-4.4 AAAAA  Central California         

P: 27MAY2020 124307    36.2N  121.8W 2.5-4.4 AAAAA  Central California          

 

A moderate M 3.9-4.2 in the Nevada aftershock zone was the largest earthquake in the U.S. or Canada today. NEIC reported it was felt with intensity III in Luning, Nevada. The last aftershock of M>=4.2 in this zone occurred on May 22, 2020 with M 5.3. Forecast 124302 had expected today's activity was likely at this epicenter around May 29.

 

O: 27MAY2020 21:45:02  38.1N  118.1W ML=3.1  EMSC   NEVADA

O: 27MAY2020 17:43:11  38.2N  117.8W ML=3.0  EMSC   NEVADA

O: 27MAY2020 16:03:23  38.2N  117.8W mb=3.9  EMSC   NEVADA                       

O: 27MAY2020 16:03:23  38.2N  117.8W mb=4.2  ANSS   NEVADA                       

P: 29MAY2020 124302    38.0N  117.9W 2.5-4.5 AAAAA  California/Nevada area     

 

A light earthquake of M 3.8 continued the current level of seismicity in Hawaii today. This event was reported by NEIC to have been felt with intensity II-III in Hawaii at Naalehu, Volcano, Captain Cook, Mountain View, Hilo, Kurtistown, Keaau and Papaikou. A pair of events of M 3.8 hit Hawaii on May 21. Forecast 124289 had expected today's activity within about 25 km likely around May 26.  This epicenter is  located at 104 degrees from the landfall of TC  Amphan and may have been  promoted by energy from that event.

 

O: 28MAY2020 03:49:26  19.2N  155.4W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

O: 27MAY2020 12:32:40  19.2N  155.4W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII     

P: 26MAY2020 124289    19.4N  155.1W 4.0-5.4 AAAAA  Hawaii area                

 

Strong aftershocks also continued today in the Vanuatu region. In the previous issue of this summary it had been noted when an M 6.1 hit the area on May 27:

 

"The strongest earthquake in the world today was an M 6.1 in Vanuatu. NEIC reported it was felt with intensity IV in Vila Shefa, Vanuatu. The mainshock was preceded by several foreshocks, including an M 4.8, 4.9 and 5.6 which were also lightly felt at Vila Shefa, Vanuatu. This is an area where strong volcanism has occurred over the past several years and these may be part of a volcanic eruption in the area. The last earthquake of M>=6.6 in the region within about 200 km of today's epicenter was an M 6.6 on July 31, 2019 at 179 km depth. The last such events at a shallow focus was an M 6.5 on August 21, 2018 and an M 6.1 on June 21, 2018. Forecast 124419 had expected today's activity was likely within about 25 km around May 24. These epicenters are at 103 degrees from the M 5.6 in Chiapas, Mexico two days ago and may have been enhanced by energy from that source." (May 26-27, 2020)

 

NEIC reported the aftershock today  of M 5.1 in Central Vanuatu was felt with intensity II-III in the area(s) of Central Vanuatu at Vila Shefa.

 

O: 27MAY2020 07:09:10  17.1S  167.9E Mw=6.1  EMSC   VANUATU

O: 27MAY2020 22:34:06  17.1S  167.9E mb=4.7  EMSC   VANUATU

O: 27MAY2020 19:01:48  17.3S  167.6E mb=4.9  EMSC   VANUATU

O: 27MAY2020 08:05:55  17.3S  167.6E mb=5.1  EMSC   VANUATU

O: 27MAY2020 07:09:10  17.1S  167.9E Mw=6.1  EMSC   VANUATU

P: 24MAY2020 124419    17.0S  168.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

QUAKES SHAKE VANUATU

 

EARTHQUAKE SUMMARY FOR MAY 26, 2020

 

The strongest earthquake in the world today was an M 6.1 in Vanuatu. NEIC reported it was felt with intensity IV in Vila Shefa, Vanuatu. The mainshock was preceded by several foreshocks, including an M 4.8, 4.9 and 5.6 which were also lightly felt at Vila Shefa, Vanuatu. This is an area where strong volcanism has occurred over the past several years and these may be part of a volcanic eruption in the area. The last earthquake of M>=6.6 in the region within about 200 km of today's epicenter was an M 6.6 on July 31, 2019 at 179 km depth. The last such events at a shallow focus was an M 6.5 on August 21, 2018 and an M 6.1 on June 21, 2018. Forecast 124419 had expected today's activity was likely within about 25 km around May 24. These epicenters are at 103 degrees from the M 5.6 in Chiapas, Mexico two days ago and may have been enhanced by energy from that source. Moderate seismicity in Crete, Greece was also at this distance from Chiapas today. A series of light earthquakes was also reported today in the Canary Islands in the Atlantic Ocean. These area located at 103 degrees from the last major earthquake in the world  - the M 7.6 in the Kurils of March 25. The area of the Canary Islands is also subject to volcanism.

 

O: 26MAY2020 23:12:02  17.1S  167.5E mb=4.9  EMSC   VANUATU

O: 27MAY2020 02:55:03  17.1S  167.8E mb=4.8  EMSC   VANUATU

O: 27MAY2020 07:09:10  17.1S  167.9E Mw=6.1  EMSC   VANUATU

O: 26MAY2020 22:52:13  17.0S  167.8E Mw=5.6  EMSC   VANUATU                       

P: 24MAY2020 124419    17.0S  168.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

An unusual M 5.2 earthquake occurred today in the Southern East Pacific Rise.

Three earthquakes of M>=5.2 have hit within about 250 km of this epicenter in  the past six years - an M 5.5 on January 23, 2016; an M 5.4 on May 4, 2019 and an M 5.8 on December 25, 2019. Today's event was not reported felt in this remote epicentral area. Forecast 124426 had expected today's event was likely within about 100 km of this epicenter around May 27. This event is near 105 degrees from the Banda Sea and could have been influenced by energy from that source.

 

O: 27MAY2020 02:33:12  24.5S  116.1W mb=5.2  EMSC   SOUTHERN EAST PACIFIC RISE   

P: 27MAY2020 124426    24.0S  115.0W 4.0-5.6 AAAAA  So. East Pacific Rise      

 

An M 3.6-3.7 was widely felt in the Bakersfield area of Central California today. This is not part of any current aftershock sequence and may represent an area of stress where a larger quake may follow. NEIC reported it was felt with intensity II-III in Bakersfield, Lamont region. This is the strongest earthquake in the Bakersfield, California area within about 100 km since an M 3.8 on April 16, 2018.  Forecast 124306 had expected today's event was likely within about 50 km around May 27.

 

O: 27MAY2020 04:52:29  35.4N  119.0W Mw=3.6  EMSC   BAKERSFIELD URBAN AREA, CALIF.

O: 27MAY2020 04:52:31  35.4N  119.0W Mw=3.7  ANSS   BAKERSFIELD URBAN AREA, CALIF.

P: 27MAY2020 124329    35.0N  119.2W 2.5-4.5 AAAAA  So. California             

 

An M 3.8 aftershock also was felt in the area of western Nevada near Tonopah today. Forecast 124306 had expected continuing aftershocks at this level at the end of May.

 

O: 27MAY2020 00:57:02  38.2N  118.0W ML=3.5  EMSC   NEVADA

O: 27MAY2020 00:57:02  38.2N  118.0W ML=3.8  ANSS   NEVADA

O: 26MAY2020 22:14:30  38.2N  117.8W ML=3.3  EMSC   NEVADA

O: 26MAY2020 09:30:41  38.1N  117.9W ML=3.1  EMSC   NEVADA

O: 26MAY2020 06:40:46  38.2N  118.0W ML=3.0  EMSC   NEVADA

O: 27MAY2020 03:16:09  38.2N  117.8W ML=3.2  EMSC   NEVADA                       

P: 29MAY2020 124306    38.7N  119.7W 2.5-4.5 AAAAA  California/Nevada area     

 

An event of M 3.4 also occurred in Hawaii today. This continues seismicity at this magnitude level which has been seen in the area throughout the month of May and may indicate a forthcoming re-eruptive phase of regional seismicity.

The M 3.3-3.4 was also felt in Hawaii with intensity II-III in Volcano, Hilo, Kurtistown, Keaau and Papaikou today. Forecast 124289 had expected today's event was likely within about 25 km around May 26.

 

O: 26MAY2020 15:55:40  19.5N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII     

P: 26MAY2020 124289    19.4N  155.1W 4.0-5.4 AAAAA  Hawaii area                

 

MANIPUR, INDIA SHAKES TO MODERATE QUAKE

 

EARTHQUAKE SUMMARY FOR MAY 25, 2020

 

The most widely felt earthquake in the world today occurred in Manipur, India with M 5.1. This event is near the landfall of TC Amphan several days ago and may have been triggered by that event. NEIC reported it was felt with maximum intensity V in Manipur, India and II-III in Moirang, Mayang, Imphas, Thoubal, in Assam at Silchar, Lala, Aizael and Kolasib, Mizoram. This is the largest earthquake within about 200 km of this epicenter since an M 5.9 on April 16, 2020 and prior to that an M 5.3 on April 4, 2019. Forecast 124292 had expected regional seismicity enhancement with TC Amphan was likely in the area around May 24.

 

O: 25MAY2020 14:42:17  24.4N   93.9E Mw=5.1  EMSC   MANIPUR, INDIA REGION        

P: 24MAY2020 124292    27.0N   92.0E 4.0-5.5 ACBAA  Myanmar                    

 

The strongest earthquake in the world today was an M 5.4 in the area south of Guam. NEIC reported it was felt with intensity III in Mangilao, Guam. The last earthquake of M>=5.4 within about 200 km of Guam was an M 5.6 and an aftershock of M 5.5 on July 16 and 21, 2019. The last of significantly larger magnitude occurred as an M 5.8 on September 23, 2018. Regional seismicity often peaks during typhoon season, so this may be the opening event of several this summer in the region. Forecast 124051 had expected today's activity was likely in mid-May.

 

O: 25MAY2020 23:22:25  12.6N  144.2E Mw=5.4  EMSC   GUAM REGION                  

O: 26MAY2020 05:25:42  14.3N  146.8E mb=5.2  EMSC   ROTA REGION, N. MARIANA ISLAND

P: 16MAY2020 124051    15.0N  147.0E 4.0-5.4 CAAAA  No. Marianas               

 

Aftershocks continued in the Cook Strait of New Zealand today following the M 5.5-5.9 quake yesterday. The largest of today's regional events was an M 5.0-5.6. NEIC reported it was felt with intensity V in Levin Manawatu-Wanganui and IV in Te Horo, Kapiti, and Porirua, Wellington. Lesser shaking was reported from Palmerston North, Wanganui, Lower Hutt, New Plyouth and Tapawera. GEONET reported this earthquake was felt with moderate intensity in Cook Strait and northern South Island. 20626 people reported feeling this event; 5854 with weak intensity; 10177 with light shaking; 3966 moderate; 582 strong; 22 with severe and 25 with extreme shaking. Forecast 124446 had expected this activity was likely within about 50 km of this epicenter around May 25. This summary noted the mainshock in the previous issue as:

 

 

"The last event in the Cook Strait within about 200 km of today's epicenter was an M 6.2 on January 20, 2014. There have been no larger quakes in the Cook Strait in the past 30 years. Forecasts 124222 and 124446 had expected today's activity was likely around May 19-25. This epicenter is at 103 degrees from the landfall of Amphan and 100-105 from events of M 6.5 in Idaho and Nevada and at the seventh node (52 degrees) from the Banda Sea and was probably promoted by energy from all these sources." (May 24-25, 2020)

 

This epicenter is also at 101 degrees from the M 5.5 in Chiapas, Mexico two days ago.

 

O: 26MAY2020 00:34:03  40.5S  175.0E Mw=5.0  EMSC   COOK STRAIT, NEW ZEALAND     

O: 26JUN2020 00:34:04  40.5S  175.0E ML=5.6  GEONET Felt with moderate intensity

P: 25MAY2020 124446    40.0S  175.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

 

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 near Rock Mountain House, Alberta, Canada. It was not reported felt in this remote area.

The last earthquake in this area with M>=3.7 was an M 4.3 on March 10, 2019 and prior to that an M 4.3 on August 9, 2014 and of M 4.0 on June 10, 1997. Forecast

124377 had expected this activity in Alberta was likely around May 24 within about 25 km of the epicenter. This epicenter is at 103 degrees from the landfall of TC Amphan, similar to that of the events in Cook Strait, New Zealand and may have been promoted by energy from that source.

 

O: 24MAY2020 09:04:32  52.2N  115.3W MB=3.7  ECAN Rocky Mountain House, AB       

P: 24MAY2020 124377    52.0N  115.0W 2.0-4.0 AAAAA  Alberta                    

 

MODERATELY STRONG QUAKE SHAKES WELLINGTON, NEW ZEALAND REGION

 

EARTHQUAKE SUMMARY FOR MAY 24, 2020

 

A moderately strong M 5.5-5.7 quake shook the areas around the Cook Strait, New Zealand today. The quake briefly interrupted the Prime Minister during a Covid-19 televised briefing. NEIC reported the mainshock was felt with maximum intensity VI in Te Horo, Wellington; V in Lower Hutt, Makara-Ohanu, Wellington and IV in Wanganui Manawatu, Palmerston North, Kapiti, Porirua and in Picton, Marlborough, South Island. GEONET reported the mainshock was felt with strong intensity in Cook Strait and northern South Island. 36867 people reported feeling this event; 6837 with weak intensity; 14471 with light shaking; 12291 moderate; 3057 strong; 177 with severe and 34 with extreme shaking. GEONET also reported moderate aftershocks of M 4.0, 4.4, 4.5 and 4.3 were felt by thousands. An aftershock of M 4.1 was reported felt with intensity III in Kapiti, Wellington and in Palmerston North Manawatu-Wanganui, New Zealand. This area was considered vulnerable to seismic enhancement at this time as noted in the previous issue of this summary:

 

 

"Note that the area of northern New Zealand from the Cook Strait to the Kermadec Islands is at 101-104 degrees from the landfall of TC Amphan. Earthquakes in  the past several days suggest activation of this area and a stronger event is possible in the next several days as well. This region is also at 100-103 degrees from the M 5.5 in Chiapas, Mexico, and from the M 6.5 in Nevada of May 15 increasing the likelihood a seismic enhancement at this time. A light earthquake of M 4.3 shook areas of North Island today. NEIC reported this earthquake of M 4.4 in North Island, New Zealand  was felt with intensity II-III in the area(s) of North Island, New Zealand at Te Puke, Bay of Plenty.

This event had been anticipated in forecast 124440 to occur around May 25. This is the strongest quake in this area in more than two months - since an M 4.8 on March 15, 2020. This event is at 103 degrees from the landfall of TC Amphan and at 103 degrees from the M 6.5 in Southern Idaho of March 31 and was probably promoted by energy from those events." (May 23-24, 2020)

 

The last event in the Cook Strait within about 200 km of today's epicenter was an M 6.2 on January 20, 2014. There have been no larger quakes in the Cook Strait in the past 30 years. Forecasts 124222 and 124446 had expected today's activity was likely around May 19-25. This epicenter is at 103 degrees from the landfall of Amphan and 100-105 from events of M 6.5 in Idaho and Nevada and at the seventh node (52 degrees) from the Banda Sea and was probably promoted by energy from all these sources.

 

O: 24JUN2020 19:53:33  40.5S  174.9E ML=5.9  GEONET Felt with strong intensity

O: 24JUN2020 21:47:41  40.5S  174.9E ML=4.0  GEONET Felt with moderate intensity

O: 24JUN2020 22:44:30  40.5S  175.0E ML=4.4  GEONET Felt with moderate intensity

O: 25JUN2020 00:38:27  40.4S  175.0E ML=4.5  GEONET Felt with moderate intensity

O: 25JUN2020 05:44:15  40.4S  175.0E ML=4.3  GEONET Felt with moderate intensity

O: 25MAY2020 05:44:15  40.4S  175.0E ML=4.1  EMSC   COOK STRAIT, NEW ZEALAND

O: 25MAY2020 00:38:27  40.4S  175.0E ML=4.4  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 24MAY2020 19:53:32  40.4S  175.0E Mw=5.5  EMSC   COOK STRAIT, NEW ZEALAND

O: 24MAY2020 21:47:41  40.5S  175.0E ML=4.0  EMSC   COOK STRAIT, NEW ZEALAND

O: 24MAY2020 22:44:30  40.5S  175.0E mb=4.2  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 19MAY2020 124222    41.0S  175.0E 3.0-5.0 BAAAA  So. Island, N.Z.            

P: 25MAY2020 124446    40.0S  175.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in Oklahoma. Seismic enhancement of the region is common near new moons. NEIC reported today's event was felt with maximum intensity VI in Oklahoma at Drummond; V in Meno and IV in Ringwood with II-III in Lahoma, Enid, Helena, Okeene, and Piedmont and in Kiowa, Kansas. The last earthquake of M>=3.9 in Oklahoma was an M 4.5 about 200 km northeast of today's epicenter on January 19, 2020 and prior to that an M 3.9 on September 16, 2019. Forecast 124338 had expected today's activity within about 50 km was likely around May 28.

 

O: 24MAY2020 15:21:31  36.4N   98.2W mb=2.7  EMSC   OKLAHOMA

O: 24MAY2020 14:53:59  36.4N   98.2W mb=3.8  EMSC   OKLAHOMA

O: 24MAY2020 14:53:59  36.4N   98.2W mb=3.9  ANSS   OKLAHOMA

O: 24MAY2020 13:19:13  36.5N   99.0W ML=2.4  EMSC   OKLAHOMA

O: 24MAY2020 16:06:47  36.5N   99.0W mb=2.4  EMSC   OKLAHOMA                     

P: 28MAY2020 124338    37.0N   98.0W 2.0-4.2 BAAAA  Southern Plains            

 

An M 3.8 also occurred in the Ridgecrest, California aftershock zone today. Maximum intensity IV was felt in Inyokern, Onyx, and Seqouia National Park with II-III in Ridgecrest, Trona, Kernville, Weldon, Lake Isabella, Bodfish and Wofford Heights, California. The last event in the Ridgecrest aftershock zone of larger magnitude was an M 4.0 on April 21, 2020. Forecast 124333 had expected today's event within about 10 km of the epicenter was likely around May 26.

 

O: 24MAY2020 23:25:07  35.7N  117.5W ML=2.0  EMSC   SOUTHERN CALIFORNIA          

O: 24MAY2020 12:55:08  35.9N  117.7W Mw=3.8  EMSC   CENTRAL CALIFORNIA

P: 26MAY2020 124333    35.9N  117.7W 2.5-4.7 AAAAA  So. California              

 

DERATELY STRONG QUAKE SHAKES CHIAPAS,  MEXICO

 

EARTHQUAKE SUMMARY FOR MAY 23, 2020

 

A moderately strong M 5.5 quake shook regions of Chiapas, Mexico and Guatemala today. The mainshock was reported by NEIC to have been felt as far as southern Texas. A foreshock of M 4.3 was reported felt with intensity IV in Tapachula, Chiapas, Mexico. An afershock of M 4.2 was felt in San Pablo la Laguna Solola, Guatemala. This summary had expected this area to be active at this time due to its distance (144 degrees) from the landfall of Tropical Cyclone Amphan in Bangladesh two days ago and its proximity to the maximum stress longitude of the current new moon as:

 

 

"The new moon arrives on May 22 at 17:38 UT. Areas which are sub-solar (local noon) at this time are near 85 West and those at local midnight at 95 East longitudes. These include Central and South America in the west and southeast Asia and Indonesia in the east. These area may see a strong earthquake due to tidal stresses in the next six days. Other areas may also be see enhanced seismicity at this time due to tidal stresses." (May 19-21, 2020)

 

"These epicenters (in Colombia and Nicaragua) are at 144-149 degrees from the landfall of Tropical Cyclone Amphan in the Bay of Bengal. This summary had expected this was possible in the previous issue as:

 

"TC Amphan (01B) continued today in the area south of Pakistan with winds up to 105 kts as a major cyclone. This is the strongest cyclone ever recorded in this area of the Bay of Bengal. It is expected to track to the north possibly affect seismicity in Bangladesh, eastern Pakistan and central and southeastern Asia in the next week. The antipode of the expected landfall is a about 21S 92W in the South Pacific - a non-seismic region. Areas at 144 degrees from the expected landfall include Mexico and Guatemala, those near 103 degrees include areas off Washington State and the Kermadec Islands. These may see seismic enhancement with landfall of this powerful storm." (May 18-20, 2020)

 

 

and

 

"A series of moderate quakes also shook areas of Chiapas and Guatemala today.

These may be related (as indicated above to the landfall of TC Amphan later today  in Bangladesh." (May 20, 2020)

 

Today's event of M 5.5 in Chiapas was accompanied by several moderate foreshocks and aftershocks. At M 5.5 it is the strongest event in Chiapas during 2020. Larger events most recently hit the area on December 23, 2019 (M 5.8) and November 20, 2019 (M 6.3). Much of today's activity was occurring around local solar midnight and was probably promoted by tidal stresses associated with recent new moon. Forecasts 124038 and 124263 had expected today's activity in Chiapas within about 50 km was likely between May 20 and 25. The mainshock occurred at 144 degrees from the landfall of TC Amphan as expected.

 

O: 24MAY2020 02:34:58  14.3N   93.2W ML=4.4  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 24MAY2020 05:53:08  14.8N   92.3W mb=4.2  EMSC   CHIAPAS, MEXICO

O: 23MAY2020 08:56:56  14.9N   93.7W mb=4.5  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 23MAY2020 07:00:05  15.7N   94.9W ML=3.9  EMSC   OFFSHORE OAXACA, MEXICO

O: 23MAY2020 08:12:12  15.8N   93.5W ML=3.8  EMSC   CHIAPAS, MEXICO

O: 24MAY2020 03:52:27  14.8N   93.7W Mw=5.5  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 20MAY2020 124038    15.0N   93.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

P: 25MAY2020 124263    14.0N   93.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

Note that the area of northern New Zealand from the Cook Strait to the Kermadec Islands is at 101-104 degrees from the landfall of TC Amphan. Earthquakes in  the past several days suggest activation of this area and a stronger event is possible in the next several days as well. This region is also at 100-103 degrees from the M 5.5 in Chiapas, Mexico, and from the M 6.5 in Nevada of May 15 increasing the likelihood a seismic enhancement at this time. A light earthquake of M 4.3 shook areas of North Island today. NEIC reported this earthquake of M 4.4 in North Island, New Zealand  was felt with intensity II-III in the area(s) of North Island, New Zealand at Te Puke, Bay of Plenty. This event had been anticipated in forecast 124440 to occur around May 25. This is the strongest quake in this area in more than two months - since an M 4.8 on March 15, 2020. This event is at 103 degrees from the landfall of TC Amphan and at 103 degrees from the M 6.5 in Southern Idaho of March 31 and was probably promoted by energy from those events.

 

O: 23MAY2020 22:40:02  37.7S  176.4E mb=4.3  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 23MAY2020 22:40:02  37.7S  176.5E mb=4.4  ANSS   NORTH ISLAND OF NEW ZEALAND  

P: 25MAY2020 124440    37.0S  177.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

The strongest seismicity in the world today occurred in the mid-Ocean Ridges. These events are not generally felt in these remote areas and these were no exception to this rule. The strongest today was an M 5.9 in the Southern Mid-Atlantic Ridge. This is the largest quake within about 200 km of this epicenter since an M 6.0 twenty years ago on October 21, 2000, the only other such event in the area in the past 30 years. Forecast 124223 had expected the area would be active in mid-May. The quake occurred near local solar midnight and could have been promoted by tidal stresses associated with the new moon.

 

O: 24MAY2020 02:52:26  47.4S   12.3W Mw=5.9  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P: 15MAY2020 124223    44.0S   16.0W 4.0-5.7 CCCAA  So. Mid-Atlantic Ridge     

 

The other mid-ocean activity of note today was a series of events in the southern Indian Ocean including an M 5.6. This activity is near the antipode of the M 6.1 in Baja California, Mexico which occurred yesterday and may have been promoted by antipodal concentration of energy from that event. This is the strongest event within about 250 km of this epicenter since an M 6.0 on July 19, 2017 and the largest within about 200 km since an M 5.7 on September 3, 2010, ten years ago. Forecast 124414 had expected today's activity within about 25 km  was likely around May 25. These epicenters are at 102 degrees from the M 7.6  in the Kurils of March 25 (like the activity in southern Puerto Rico) and may also have been promoted by energy from that source.

 

O: 23MAY2020 23:45:09  14.9S   66.7E mb=5.0  EMSC   MID-INDIAN RIDGE

O: 24MAY2020 00:28:00  14.9S   66.9E mb=5.1  EMSC   MID-INDIAN RIDGE

O: 23MAY2020 23:02:36  14.9S   66.7E Mw=5.6  EMSC   MID-INDIAN RIDGE             

P: 25MAY2020 124414    15.0S   67.0E 4.0-5.4 AAAAA  So. Indian Ocean           

 

The strongest earthquake in the U.S. or Canada today was an M 4.4-4.8 in the Kodiak Island region of Alaska. NEIC reported this earthquake of M 4.4 in Kodiak Island, Alaska  was felt with intensity II-III in the area(s) of Kodiak Island, Alaska. The only other event in the Kodiak region of Alaska with M>=4.8 in the past six months was an M 5.2-5.3 on April 17, 2020 and this may be an aftershock of that event. Forecast 124158 had expected activity in the area around May 21.

 

O: 23MAY2020 08:52:04  56.2N  154.5W mb=4.8  EMSC   KODIAK ISLAND REGION, ALASKA 

O: 23MAY2020 08:52:04  56.2N  154.5W mb=4.4  ANSS   KODIAK ISLAND REGION, ALASKA 

P: 21MAY2020 124158    54.8N  158.7W 3.5-5.0 ABBAA  Alaska Peninsula           

 

STRONG QUAKE SOUTH OF BAJA CALIFORNIA, MEXICO PROBABLY TIDALLY PROMOTED

 

EARTHQUAKE SUMMARY FOR MAY 22, 2020

 

The strongest earthquake in the world today was an M 6.1 south of Baja California. NEIC reported it was felt as far as 1000 km to the north in southern California. But likely intensities include IV in Los Cabos, Baja California Sur, Cabo San Lucas, Mazatlan, La Paz and Tlalnepantla, Mexico This event was likely promoted by tidal stresses from the new moon. When a foreshock of M 4.1 hit the same area yesterday, this summary noted in this regard:

 

 

"An unusual earthquake of M 4.1 also occurred today off the coast of Baja California. This is the strongest earthquake within about 100 km of this epicenter since an M 4.3 September 3, 2019. An M 5.8 about 200 km southwest of this occurred on August 14, 2019 and an M 4.1 about 150 km northwest occurred on February 19, 2019.  Forecast 124062 had expected this activity to the south was likely around May 19. This occurred near local solar noon and may indicate high stress in the area and further activity to come." (May 21-22, 2020)

 

The earthquake in Baja, Mexico is located at the third node (120 degrees) from the M 7.3 in the Banda Sea of May 6 and may have been promoted by energy from that source. It is the strongest earthquake within about 200 km of this epicenter since an M 6.2 on October 8, 2014 and prior to that an M 6.5 on October 3, 2002. The only event of similar magnitude to occur this far to the south in the region in the past 30 years was an M 6.1 on November 13, 2001.  Forecast 124062 had expected activity in this area was likely around May 19.

 

O: 22MAY2020 08:46:08  22.5N  107.9W Mw=6.1  EMSC   OFF COAST OF SINALOA, MEXICO 

P: 19MAY2020 124062    20.0N  109.0W 3.5-5.1 BCAAA  Gulf of California          

 

The largest earthquake in the U.S or Canada today was an M 5.2 west of Vancouver Island, British Columbia, Canada. NEIC reported intensity II-III felt within about 500 km of the epicenter at Ucluelet, and Walnut Grove, British Columbia. This epicenter is at 103 degrees from the M 7.3 of May 5 in the Banda Sea and was probably promoted by energy from that source. It was associated with the new moon today when tidal stresses were high and was probably enhanced by these tidal stresses as noted in previous issues of this report:

 

"The new moon arrives on May 22 at 17:38 UT. Areas which are sub-solar (local noon) at this time are near 85 West and those at local midnight at 95 East longitudes. These include Central and South America in the west and southeast Asia and Indonesia in the east. These area may see a strong earthquake due to tidal stresses in the next six days. Other areas may also be see enhanced seismicity at this time due to tidal stresses." (May 19-21, 2020)

 

This is the strongest earthquake within about 200 km of the epicenter since a series in late December, 2019 which included events of M 6.0, 6.0 and 6.3 near today's epicenter. The epicenter is located at 102 degrees from the M 7.3 in the Banda Sea of May 6, and like the M 5.5 of May 18, 2020  off the coast of Northern California at the same distance from the Banda Sea, was probably promoted by concentrated energy from that source. Forecast 124162 had expected today's event in this area was likely in mid-May.

 

O: 23MAY2020 02:14:50  50.4N  129.6W Mw=5.2  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 23MAY2020 02:14:50  50.4N  129.5W Mw=5.2  ANSS   VANCOUVER ISLAND, CANADA REGIO

O: 23MAY2020 02:14:52  50.4N  129.3W MB=4.9  ECAN of Port Alice, BC              

P: 15MAY2020 124162    50.7N  130.5W 3.0-4.9 CAAAA  British Colombia           

 

Moderate aftershocks continued in western Nevada today. The strongest of these were M 4.2 and 4.4 and were felt in the Tonopah and Hawthorne areas of Nevada with light intensity.

 

This summary continues to watch the region of Chiapas, Mexico for signs of

stronger seismicity. The area is at 144 degrees from the landfall of Tropical Cyclone Amphan in Bangladesh, a distance where seismic promotion is considered likely. It is also near the longitude of maximum tidal stress with this new moon and could be affected by those. Several moderate quakes hit the area today, but these are not unusual. These occurred near local solar midnight suggesting tidal influence.

 

O: 22MAY2020 07:15:14  14.6N   92.4W ML=4.3  EMSC   OFFSHORE CHIAPAS, MEXICO     

O: 23MAY2020 05:24:42  14.7N   93.8W ML=4.4  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 20MAY2020 124038    15.0N   93.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

NEW MOON ENHANCES AFTERSHOCK ACTIVITY IN IDAHO/CALIFORNIA/NEVADA

 

EARTHQUAKE SUMMARY FOR MAY 21, 2020

 

Significant aftershocks occurred today in the region of western Nevada (M 5.3 ); Idaho (M 4.4) and Hawaii (M 3.8). These events occurred with the new moon and were probably enhanced by tidal stresses associated with that alignment.

A moderate earthquake of M 4.8-5.3 shook western Nevada in the Tonopah area. This is the strongest aftershock to date of the M 6.5 of May 15. NEIC reported it was felt with intensity II-III within about 130 km of the epicenter at Silverpeak, Goldfield, Hawthorne, Tonopah and Yerington, Nevada and in California at Bishop, Big Pine, Lee Vining, June Lake, Mammoth Lake.  It was probably enhanced by stresses associated with the new moon which also arrived May 22. Forecast 124076 had expected today's activity was likely around May 18.

 

O: 22MAY2020 00:22:00  38.2N  117.8W Mw=4.8  EMSC   NEVADA                       

O: 22MAY2020 00:22:00  38.2N  117.8W Mw=5.3  ANSS   NEVADA                        

O: 21MAY2020 12:08:07  38.2N  117.9W ML=3.0  EMSC   NEVADA                       

P: 18MAY2020 124076    38.6N  118.6W 2.5-4.5 BAAAA  California/Nevada area     

 

A moderate M 4.4 aftershock also shook areas of Southern Idaho today. NEIC reported this was felt with intensity II-III in Idaho at Lowman, Cascade, Ketchum, Garden City, Boise, Emmett, Eagle and Council among others. The last  aftershock in the region of southern Idaho of the M 6.5 that shook the area on March 31 with M>=4.4  occurred on May 14 - also of M 4.4 and an M 4.6 on April 1, 2020, an immediate aftershock of the mainshock. Two light aftershocks of M 2.7 and 3.1 followed within minutes of local solar noon, an indication of tidal enhancement. Today's event was likely enhanced by tidal stresses associated with the new moon as noted in previous issues of this report:

 

"The new moon arrives on May 22 at 17:38 UT. Areas which are sub-solar (local noon) at this time are near 85 West and those at local midnight at 95 East longitudes. These include Central and South America in the west and southeast Asia and Indonesia in the east. These areas may see a strong earthquake due to tidal stresses in the next six days. Other areas may also be see enhanced seismicity at this time due to tidal stresses." (May 19-21, 2020)

 

Forecast 124134 had expected continuing aftershock activity in mid-May.

 

NEIC reported the earthquake of M 3.5  in Southern Idaho  was felt with intensity II-III in the area(s) of Southern Idaho in Stanley, Lowman, Challis, Boise, Meridian, and Rexburg.

 

O: 21MAY2020 23:35:46  44.3N  115.1W ML=3.5  EMSC   SOUTHERN IDAHO               

O: 21MAY2020 11:33:50  44.4N  115.2W ML=4.4  EMSC   SOUTHERN IDAHO

O: 21MAY2020 19:45:45  44.4N  115.3W ML=3.1  EMSC   SOUTHERN IDAHO

O: 21MAY2020 11:05:26  44.4N  115.3W ML=3.4  EMSC   SOUTHERN IDAHO

O: 21MAY2020 19:40:01  44.5N  115.2W ML=2.7  EMSC   SOUTHERN IDAHO

P: 17MAY2020 124134    44.4N  115.1W 2.0-4.0 BAAAA  Montana/Idaho              

 

An M 3.8 also shook areas of Hawaii today. This event was reported felt with maximum intensity IV in Papaikou, Hawaii and II-III in Hakalau, Volcano, Capatain Cook, Mountain View, Hilo, Kealakekua, Paauilo, Pahala and Naalehu. Several earthquakes of M 3.8 have occurred in Hawaii during May, but these on  May 6 and 12 were located in the Loi'hi Seamount area south of Hawaii about 50  km south of today's event. Today's epicenter is the first within 50 km  with such an event since an M 3.8  on March 21, 2020. The last of larger magnitude was an M 4.2 on February 3, 2020. Today's event occurred within minutes of local solar midnight and was probably promoted by tidal stresses associated with the new moon which maximize near  this hour. Forecast 124063 had expected today's activity around May 20.

 

O: 21MAY2020 10:42:45  19.2N  155.4W Ml=3.8  EMSC   ISLAND OF HAWAII, HAWAII     

P: 20MAY2020 124063    20.1N  156.1W 4.0-5.4 AAAAA  Hawaii area                

 

An unusual earthquake of M 4.1 also occurred today off the coast of Baja California. This is the strongest earthquake within about 100 km of this epicenter since an M 4.3 September 3, 2019. An M 5.8 about 200 km southwest of this occurred on August 14, 2019 and an M 4.1 about 150 km northwest occurred on February 19, 2019.  Forecast 124062 had expected this activity to the south was likely around May 19. This occurred near local solar noon and may indicate high stress in the area and further activity to come.

 

O: 21MAY2020 17:04:49  21.9N  108.2W mb=4.1  EMSC   OFF COAST OF BAJA CALIFORNIA S

P: 19MAY2020 124062    20.0N  109.0W 3.5-5.1 ABAAA  Gulf of California         

 

MODERATELY STRONG QUAKE SHAKES CENTRAL MEDITERRANEAN

 

EARTHQUAKE SUMMARY FOR MAY 20, 2020

 

The strongest earthquake in the world today was an M 5.7-5.8 south of Greece in the Mediterranean Sea. NEIC reported it was felt with intensity II-III in Benghazi, Libya; Grammenitsa, Greece, Sliema, Malta; Catania, Italy, and Fier, Albania among others. This epicenter south of Greece is somewhat unusual for an earthquake this size. The last event in the area within about 200 km of this epicenter with M>=5.8 was recorded on April 16, 2012. All the earthquakes in the area of M>=5.8 in the past 30 years have occurred about 100-200 km east of this epicenter with no such events to the west in this time frame. Forecast 124094 had expected this event in this area was likely around May 17. This appears to be part of the activation of the Anatolian Fault zone which has seen strong earthquakes in Crete, Greece in recent days. It is likely it is related to the events in Crete through stress redistribution.  These events have been occurring at 100-104 degrees from the M 7.3 in the Banda Sea and from the M 6.5 in Nevada of May 5 and May 15.  Today's event, which occurred near local solar midnight. The seismic forecast associated with the current new moon reads:

 

"The new moon arrives on May 22 at 17:38 UT. Areas which are sub-solar (local noon) at this time are near 85 West and those at local midnight at 95 East longitudes. These include Central and South America in the west and southeast Asia and Indonesia in the east. These areas may see a strong earthquake due to tidal stresses in the next six days. Other areas may also be see enhanced seismicity at this time due to tidal stresses." (May 19-21, 2020)

 

This event is located at the 6th node (60 degrees) from the landfall of TC Amphan in Pakistan and may have been promoted by energy from that source.

 

O: 20MAY2020 23:43:15  35.2N   20.2E mb=5.8  EMSC   CENTRAL MEDITERRANEAN SEA    

P: 17MAY2020 124094    36.0N   22.0E 3.0-4.4 BABAA  No. Greece                 

 

The strongest earthquake outside Alaska in the U.S. or Canada today was an M 5.0 aftershock in the Tonopah, Nevada area. NEIC reported maximum intensity IV in Silverpeak, Nevada with II-III felt in Nevada at Luning, Hawthorne, Round Mountain, Tonopah, Fallon, Gardnerville and Carson City and in California at Benton, Bishop. Following is a listing of events in the aftershock zone today of M>=3.5. A more extensive list of M>=3 can be found in the California/Nevada regional section of this summary.

 

O: 20MAY2020 12:36:53  38.2N  117.7W Mw=4.9  EMSC   NEVADA

O: 20MAY2020 12:36:53  38.2N  117.7W Mw=5.0  ANSS   NEVADA

O: 20MAY2020 09:46:16  38.1N  118.1W ML=4.0  EMSC   NEVADA

P: 18MAY2020 124076    38.6N  118.6W 2.5-4.5 BAAAA  California/Nevada area     

 

 

The strongest earthquake in Alaska today was an M 5.0 in the area south of Alaska. It was not reported felt in the area. Several moderate aftershocks followed including an M 4.6. This is a somewhat unusual epicenter. The last event of M>=5.0 within about 150 km of this epicenter was an M 5.0 on October 10, 2018 with a similar M 5.0 on February 23, 2018. The last event in the area with M>5 was an M 5.8 on May 31, 2016  - the largest in the past 30 years - and prior to that an M 5.5 on December 7, 2013. Forecast 124158 had expected today's activity within about 25 km was likely  between May 15 and 21.

 

O: 20MAY2020 19:38:19  54.6N  156.7W ML=3.1  EMSC   SOUTH OF ALASKA

O: 20MAY2020 20:54:53  54.6N  156.8W ml=3.1  EMSC   SOUTH OF ALASKA

O: 20MAY2020 17:13:20  54.9N  157.0W mb=5.0  EMSC   SOUTH OF ALASKA

O: 20MAY2020 17:18:23  55.0N  157.0W mb=4.6  EMSC   SOUTH OF ALASKA              

P: 15MAY2020 124158    54.7N  156.9W 3.5-4.9 BAAAA  Alaska Peninsula           

P: 21MAY2020 124158    54.8N  158.7W 3.5-5.0 AAAAA  Alaska Peninsula            

 

A series of moderate earthquakes hit the region of eastern Oaxaca, Chiapas, Mexico and Guatemala today. The strongest of these was an M 4.9 off the coast of Oaxaca, Mexico. NEIC reported this earthquake of M 4.9 in Oaxaca, Mexico  was felt with intensity II-III in the area(s) of  Tuxtla Gutierrez, Chiapas, Mexico.

This activity is located at 143-146 degrees from the landfall of Tropical  Storm Amphan which occurred today in Bangladesh, India and Pakistan. This is a distance at which energy is strongly concentrated following major surface events on the earth due to reflection of energy off the core boundaries. Strong triggering is not uncommon at this distance after major energy events such as earthquakes and strong ocean storm landfall. Previous issues of this summary had noted in this regard:

 

"TC Amphan (01B) made landfall today in the area of Bangladesh with winds up to 90 kts as a major cyclone. This is the strongest cyclone ever recorded in this area of the Bay of Bengal. It is expected to track to the north possibly affect seismicity in Bangladesh, eastern Pakistan and central and southeastern Asia in the next week. The antipode of the expected landfall is a about 21S 92W in the South Pacific - a non-seismic region. Areas at 144 degrees from the expected landfall include Mexico and Guatemala, those near 103 degrees include areas off Washington State and the Kermadec Islands. These may see seismic enhancement with landfall of this powerful storm$." (May 18-21, 2020)

 

O: 20MAY2020 20:52:45  13.3N   92.4W ML=3.9  EMSC   OFF THE COAST OF GUATEMALA   

P: 20MAY2020 124038    15.0N   93.0W 3.5-5.3 ABAAA  Chiapas, Mexico            

 

O: 20MAY2020 07:49:55  14.2N   91.3W mb=4.0  EMSC   GUATEMALA                    

P: 20MAY2020 124042    15.0N   91.0W 3.5-5.3 AAAAA  Guatemala                  

 

NEIC reported this earthquake of M 4.0 in Guatemala  was felt with intensity II-III in the area(s) of Guatemala at Palin Escuintla.

 

O: 20MAY2020 15:33:03  15.4N   94.8W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 21MAY2020 05:59:17  15.6N   94.8W mb=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 21MAY2020 04:28:57  15.7N   94.6W Mw=4.9  EMSC   OFFSHORE OAXACA, MEXICO

O: 20MAY2020 19:36:47  16.4N   94.7W ML=3.9  EMSC   OAXACA, MEXICO

O: 20MAY2020 21:11:08  15.1N   94.5W ML=3.9  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 18MAY2020 124053    16.0N   96.0W 3.5-5.3 AAAAA  Oaxaca, Mexico             

 

O: 20MAY2020 20:13:35  17.7N   93.9W ML=4.0  EMSC   VERACRUZ, MEXICO             

P: 17MAY2020 124039    17.0N   95.0W 3.5-5.4 AAAAA  Chiapas, Mexico            

 

MODERATE SEISMICITY IN CENTRAL AMERICA MAY BE PROMOTED FROM TC AMPHAN

 

EARTHQUAKE SUMMARY FOR MAY 19, 2020

 

The strongest earthquakes in the world today occurred with M 4.9 in Colombia and Nicaragua. These epicenters are at 144-149 degrees from the landfall of Tropical Cyclone Amphan in the Bay of Bengal. This summary had expected this was possible in the previous issue as:

 

"TC Amphan (01B) continued today in the area south of Pakistan with winds up to 105 kts as a major cyclone. This is the strongest cyclone ever recorded in this area of the Bay of Bengal. It is expected to track to the north possibly affect seismicity in Bangladesh, eastern Pakistan and central and southeastern Asia in the next week. The antipode of the expected landfall is a about 21S 92W in the South Pacific - a non-seismic region. Areas at 144 degrees from the expected landfall include Mexico and Guatemala, those near 103 degrees include areas off Washington State and the Kermadec Islands. These may see seismic enhancement with landfall of this powerful storm." (May 18-19, 2020)

 

The earthquakes in Nicaragua and Colombia also are consistent with tidal stress triggering associated with the upcoming New Moon as outlined in this and previous summaries:

 

"The new moon arrives on May 22 at 17:38 UT. Areas which are sub-solar (local noon) at this time are near 85 West and those at local midnight at 95 East longitudes. These include Central and South America in the west and southeast Asia and Indonesia in the east. These areas may see a strong earthquake due to tidal stresses in the next six days. Other areas may also be see enhanced seismicity at this time due to tidal stresses." (May 18-19, 2020)

 

The M 5.0 in Colombia was the strongest within about 200 km of that epicenter since an M 5.1 on April 2, 2020 and prior to that an M 6.1 on March 23, 2019. Forecast 124003 had expected today's activity was likely in this area around May 20.

 

O: 19MAY2020 07:18:59   5.9N   77.5W mb=5.0  EMSC   NEAR WEST COAST OF COLOMBIA  

O: 19MAY2020 07:18:00   5.9N   77.7W ML=4.7  EMSC   NEAR WEST COAST OF COLOMBIA  

P: 20MAY2020 124003     5.0N   78.0W 4.0-5.5 AAAAA  Colombia                   

 

The M 4.9 in Nicaragua was followed by an M 4.6 aftershocks and an M 4.1 foreshock to the south. The M 4.9 in the strongest event within about 100 km of this epicenter since an M 5.3 on January 24, 2020. An M 5.5 hit nearby on January 3, 2020. Forecast 124049 had expected today's activity was likely within this area around May 20.

 

NEIC reported an earthquake of M 4.9 in Nicaragua  was felt with intensity II-III in the area(s) of Nicaragua at Diriamba Carazo, Ticuantepe, Managua, Ciudad Sandino, San Juan, and in Antiguo Cuscatlan, El Salvador.

 

O: 19MAY2020 12:17:30  10.3N   86.4W ML=4.1  EMSC   OFF COAST OF COSTA RICA       

O: 20MAY2020 05:59:07  11.5N   86.7W mb=4.6  EMSC   NEAR COAST OF NICARAGUA      

O: 20MAY2020 03:30:37  11.5N   86.8W Mw=4.9  EMSC   NEAR COAST OF NICARAGUA      

P: 20MAY2020 124049    11.0N   86.0W 3.5-5.1 AAAAA  Nicaragua                  

 

A series of moderate quakes also shook areas of Chiapas and Guatemala today.

These may be related (as indicated above to the landfall of TC Amphan later today in Bangladesh. The areas had been forecast to be active around May 19-20 forecasts 124038 and 124042)

 

O: 20MAY2020 00:59:04  13.3N   90.9W mb=4.4  EMSC   OFFSHORE GUATEMALA           

P: 19MAY2020 124042    13.0N   91.0W 3.5-5.3 AAAAA  Guatemala                  

 

O: 20MAY2020 00:32:43  14.3N   94.1W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

O: 19MAY2020 20:04:41  15.1N   94.3W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

O: 20MAY2020 01:04:53  15.1N   94.3W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 20MAY2020 124038    15.0N   93.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

Aftershocks continued to be felt in western Nevada today. The strongest of these were in the M 4.0 range and were felt in Tonopah and Luning, Nevada. The strongest of M 4.6 was felt in Nevada at Gabbs, Tonopah, Glenbrock, and in California at Benton, Bishop and June Lake. Following is a listing of events of M>=3.5 in this area today. A more extensive list of today's aftershocks of M>=3 can be found in the California/Nevada regional section of this summary.

 

O: 20MAY2020 06:43:26  37.3N  115.4W ML=4.2  EMSC   NEVADA

O: 20MAY2020 03:49:21  38.2N  118.1W ML=3.5  EMSC   NEVADA

O: 19MAY2020 22:12:45  38.2N  117.8W Mw=4.4  EMSC   NEVADA

O: 19MAY2020 10:58:42  38.2N  117.8W ML=3.7  EMSC   NEVADA

O: 19MAY2020 09:48:50  38.2N  118.1W ML=3.7  EMSC   NEVADA

O: 19MAY2020 09:08:33  38.2N  117.8W mb=4.1  EMSC   NEVADA

P: 17MAY2020 124076    38.0N  118.8W 2.5-4.5 AAAAA  California/Nevada area     

 

 

Moderate sized aftershocks also continued off the coast of northern California

in two areas. An M 4.2 near the coast of Northern California was felt with intensity II-III in California at Ferndale, Petrolia, Loleta, Rio Dell, Fortuna, Bayside, Arcata and Garber among other coastal commumities. A foreshocks of M 2.6 was felt lightly in Eureka. An M 4.4 aftershock in the area farther to the west where the M 5.5 hit yesterday was also recorded.  This moderate aftershock off the coast of Northern California of M 4.4 was reported by NEIC to have been felt with intensity IV in Fortuna and II-III in Ferndale, McKinleyville, Blue Lake, Ukiah. Forecast 124142 had expected this activity was likely around May 16-20.

 

O: 19MAY2020 10:19:26  40.3N  124.0W Md=2.6  EMSC   NORTHERN CALIFORNIA          

O: 19MAY2020 15:58:28  40.4N  124.7W Mw=4.2  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 20MAY2020 124142    40.9N  124.3W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

O: 19MAY2020 07:10:08  40.8N  127.4W mb=4.4  EMSC   OFF COAST OF NORTHERN CALIFORN

P: 16MAY2020 124142    40.3N  127.2W 2.5-4.5 BAAAA  Off Coast of No. Calif     

 

Aftershocks also continued in the region of the eastern Mediterranean and Crete, Greece today. The strongest of these was an M 4.9. This activity is being lightly felt in Greece. It is located near 101-104 degrees from both the earthquakes in Nevada of May 15 and from the Banda Sea quake of May 6 and was probably promoted by energy from these sources. Other areas at similar distance to the Banda Sea include  the areas off the coast of Northern California which also saw continuing  enhanced seismicity today. The activity in Crete had been expected within about 100 km was likely around May 19 in forecast 124085.

 

O: 19MAY2020 17:55:28  34.1N   25.5E ML=4.1  EMSC   CRETE, GREECE

O: 19MAY2020 14:35:57  34.1N   25.5E mb=4.2  EMSC   CRETE, GREECE

O: 19MAY2020 14:58:29  34.1N   25.5E mb=4.4  EMSC   CRETE, GREECE

O: 20MAY2020 01:06:19  34.1N   25.6E mb=4.1  EMSC   CRETE, GREECE

O: 19MAY2020 19:09:14  34.1N   25.6E mb=4.6  EMSC   CRETE, GREECE

O: 19MAY2020 08:42:57  34.1N   25.7E mb=4.4  EMSC   CRETE, GREECE

O: 19MAY2020 23:23:24  34.2N   25.6E mb=4.1  EMSC   CRETE, GREECE

O: 19MAY2020 21:09:42  34.2N   25.6E mb=4.2  EMSC   CRETE, GREECE

O: 20MAY2020 02:12:18  34.2N   25.8E Mw=4.9  EMSC   CRETE, GREECE

O: 20MAY2020 06:11:18  34.3N   25.7E mb=4.4  EMSC   CRETE, GREECE

O: 19MAY2020 09:24:44  33.9N   25.6E mb=4.6  EMSC   EASTERN MEDITERRANEAN SEA    

P: 19MAY2020 124085    34.0N   24.0E 3.0-4.6 AAAAA  Crete                      

 

Other earthquakes near 103 degrees from Nevada today included an M 5.2 in Sichuan, China (104 degrees) and an M 4.3 in South Island, New Zealand (106 degrees) and in Afghanistan (M 4.1). These may also have been promoted by energy from Nevada. Forecast 124066 had expected the activity in China within about 200 km was likely around May 20. This was the strongest quake of the past 24 hours in the world.

 

O: 18MAY2020 13:48:03  27.3N  103.4E Mw=5.2  EMSC   SICHUAN-YUNNAN-GUIZHOU RG, CHI

O: 18MAY2020 20:35:57  27.5N  103.3E mb=4.5  EMSC   SICHUAN-YUNNAN-GUIZHOU RG, CHI

P: 20MAY2020 124066    28.0N  101.0E 4.0-5.5 AABAA  Myanmar                     

 

GEONET reported 45 people felt the earthquake in South Island with 35 with weak intensity; 9 with light intensity and 1 with moderate intensity. None reported strong shaking and 0 extreme intensity. Forecast 124222 had expected this activity around May 21.

 

O: 19MAY2020 22:40:49  45.0S  167.5E ML=4.3  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 19MAY2020 22:40:49  45.0S  167.5E ML=4.3  GEONET reported 45 people felt this quake

P: 21MAY2020 124222    44.0S  168.0E 3.0-5.1 AAAAA  So. Island, N.Z.           

 

O: 19MAY2020 12:03:37  37.0N   69.7E mb=4.1  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 15MAY2020 124086    36.0N   69.0E 3.8-5.4 BAAAA  Hindu Kush/Pakistan        

 

 

SEISMIC ENHANCEMENT AT 103-105 DEGREES FROM BANDA SEA

 

EARTHQUAKE SUMMARY FOR MAY 18, 2020

 

Strong seismic enhancement occurred today in the distance range of 103-105 degrees from the M 7.3 in the Banda Sea of May 6, the last major earthquake in the world. Today’s events at this distance included an M 5.8 in Crete and an M 5.5 off the coast of Northern California. This follows a highly unusual M 4.9 in northern Sweden as reported on in the last issue of this summary, also at 103 degrees from the Banda Sea as:

 

 

An unusual earthquake of M 4.9 hit northern Sweden today. NEIC reported it was felt with intensity V in Kiruna, Norrbotten, Sweden. This is the strongest earthquake in Northern Sweden within about 300 km of this epicenter in at least 30 years. The largest earthquakes previously recorded in the area are of M 4.9-5.2, similar to today's. The last of these was an M 5.2 about 300 km northwest of today's epicenter on September 3, 1981 and prior to that an M 4.9 on April 28, 1974. Seven earthquakes of M 4.9-5.2 have occurred within about 400 km of this epicenter in the catalog since 1894. This earthquake is located at 103 degrees from the Banda Sea quake of May 6, 2020 (M 6.8) and was probably promoted by energy from that event.

 

The strongest earthquake in the world today was an M 5.8 in the region of Crete, Greece where it was widely felt with light to moderate intensity. This event at 105 degrees from the Banda Sea was probably promoted by energy from that source. It was followed by a strong series of aftershocks and by several foreshocks including an M 5.0. These appear to be aftershocks of the M 6.6 in Crete of May 2, 2020. At the time this summary noted in regard to these events in Crete: 

 

"Today's earthquake in Crete is the strongest within about 200 km of that epicenter in at least 30 years. The area has been active in recent months with an M 5.8 to the east on January 30, 2020 and an M 6.0 on November 27, 2019. These events were more than 200 km from today's epicenter." (May 2-3, 2020)

 

Forecast 124085 had expected today's activity in Crete was likely around May 19.

 

O: 18MAY2020 23:22:34  34.1N   25.5E Mw=5.8  EMSC   CRETE, GREECE

O: 19MAY2020 02:48:48  34.1N   25.6E mb=4.2  EMSC   CRETE, GREECE

O: 19MAY2020 00:02:41  34.1N   25.6E mb=4.6  EMSC   CRETE, GREECE

O: 19MAY2020 00:35:20  34.1N   25.7E mb=4.1  EMSC   CRETE, GREECE

O: 18MAY2020 14:11:09  34.2N   25.6E mb=4.4  EMSC   CRETE, GREECE

O: 19MAY2020 02:44:19  34.3N   25.5E mb=4.2  EMSC   CRETE, GREECE

O: 19MAY2020 04:15:43  34.3N   25.6E mb=4.2  EMSC   CRETE, GREECE

O: 18MAY2020 11:48:07  34.1N   25.5E Mw=5.0  EMSC   CRETE, GREECE                

P: 19MAY2020 124085    34.0N   24.0E 3.0-4.6 AAAAA  Crete                      

 

A moderately strong earthquake off the coast of Northern California of M 5.3-5.5 was reported by NEIC to have been felt with intensity IV in Fortuna and II-III in Ferndale, McKinleyville, Blue Lake, Ukiah.

 

An M 4.2 off the coast of Northern California was felt with intensity II-III in California at Ferndale, Petrolia, Loleta, Rio Dell, Fortuna, Bayside, Arcata and Garber among other coastal communities. A foreshock of M 2.6 was felt lightly in Eureka.

 

In the previous issue of this summary following an M 4.7 foreshock to today's events, it had been noted that this area off the coast of northern California was likely to see increased seismicity at this time as:

 

"As noted in the previous issues of this summary, this appears to be part of an activation of the Mendocino Fault inland into the northwestern U.S. As such, major enhancement can be expected on the Mendocino escarpment off the coast of Northern California." (May 16-17, 2020)

 

"The last earthquake in this area off the coast of Northern California within about 100 km of this epicenter with M>=4.7 occurred on May 5, 2019 and prior to that events of M 4.9, 5.6 and 5.2 on July 24, 2018.  Forecast 124142 had expected today's event within about 50 km was likely around May 16. More such activity is likely in coming days." (May 17-18, 2020)

 

The last earthquake within about 100 km of this epicenter in northern California with M>=5.5 occurred on July 24, 2018 with M 5.6. This epicenter is at 104 degrees from the Banda Sea and at 51.4 degrees (node 7) from the M 7.6 in the Kurils of March 25 and may have been promoted by seismic energy from these sources.

 

O: 18MAY2020 06:56:01  40.8N  127.4W Mw=5.0  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 19MAY2020 07:10:08  40.8N  127.4W mb=4.4  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 18MAY2020 07:02:34  40.8N  127.3W Mw=5.3  EMSC   OFF COAST OF NORTHERN CALIFORN

O: 18MAY2020 07:02:34  40.8N  127.2W Mw=5.5  ANSS   OFF COAST OF NORTHERN CALIFORN

P: 16MAY2020 124142    40.3N  127.2W 2.5-4.5 AAAAA  Off Coast of No. Calif     

 

O: 19MAY2020 04:17:54  40.4N  124.9W ML=2.6  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 20MAY2020 124142    40.9N  124.3W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

Aftershocks continued to be felt in western Nevada today. The strongest of these were in the M 4.0 range and were felt in Tonopah and Luning, Nevada. The strongest of M 4.6 was felt in Nevada at Gabbs, Tonopah, Glenbrock, and in California at Benton, Bishop and June Lake. Today's aftershocks of M>=3 are listed below.

 

O: 19MAY2020 03:43:21  38.1N  117.9W ML=3.3  EMSC   NEVADA

O: 19MAY2020 02:13:32  38.2N  118.0W ML=3.3  EMSC   NEVADA

O: 18MAY2020 23:23:33  38.2N  117.9W ML=3.1  EMSC   NEVADA

O: 18MAY2020 21:51:01  38.2N  118.0W ML=3.0  EMSC   NEVADA

O: 18MAY2020 19:47:17  38.2N  117.9W ML=3.0  EMSC   NEVADA

O: 18MAY2020 19:47:17  38.2N  117.9W ML=3.0  EMSC   NEVADA

O: 18MAY2020 18:30:19  38.2N  118.1W ML=3.2  EMSC   NEVADA

O: 18MAY2020 11:29:24  38.2N  117.7W ml=3.3  EMSC   NEVADA

O: 18MAY2020 11:29:24  38.2N  117.7W ml=3.3  EMSC   NEVADA

O: 18MAY2020 09:45:55  38.2N  118.0W ML=3.4  EMSC   NEVADA

O: 18MAY2020 08:44:57  38.2N  117.8W ml=3.0  EMSC   NEVADA

O: 18MAY2020 08:05:15  38.2N  117.8W ml=3.0  EMSC   NEVADA

O: 18MAY2020 07:53:57  38.2N  117.9W ml=3.1  EMSC   NEVADA

O: 18MAY2020 07:53:57  38.2N  117.9W ml=3.1  EMSC   NEVADA

O: 19MAY2020 03:43:21  38.1N  117.9W ML=3.3  EMSC   NEVADA                       

P: 16MAY2020 124076    37.3N  118.3W 2.5-5.6 BAAAA  California/Nevada area     

P: 17MAY2020 124076    38.0N  118.8W 2.5-4.5 AAAAA  California/Nevada area     

P: 18MAY2020 124076    38.6N  118.6W 2.5-4.5 AAAAA  California/Nevada area     

 

MODERATE, UNUSUAL  QUAKE SHAKES SWEDEN

 

EARTHQUAKE SUMMARY FOR MAY 17, 2020

 

An unusual earthquake of M 4.9 hit northern Sweden today. NEIC reported it was felt with intensity V in Kiruna, Norrbotten, Sweden. This is the strongest earthquake in Northern Sweden within about 300 km of this epicenter in at least 30 years. The largest earthquakes previously recorded in the area are of M 4.9-5.2, similar to today's. The last of these was an M 5.2 about 300 km northwest of today's epicenter on September 3, 1981 and prior to that an M 4.9 on April 28, 1974. Seven earthquakes of M 4.9-5.2 have occurred within about 400 km of this epicenter in the catalog since 1894. This earthquake is located at 103 degrees from the Banda Sea quake of May 6, 2020 (M 6.8) and was probably promoted by energy from that event.

 

O: 18MAY2020 01:11:57  67.8N   20.1E mb=4.9  EMSC   SWEDEN                       

 

An M 4.7 occurred off the coast of Northern California today. It was not reported felt but was probably lightly felt on the mainland near Eureka. This is consistent with regional seismic promotion associated with the M 6.5 in Nevada of May 15 as noted in the previous issue of this report:

 

"As noted in the previous issues of this summary, this appears to be part of an activation of the Mendocino Fault inland into the northwestern U.S. As such, major enhancement can be expected on the Mendocino escarpment off the coast of Northern California." (May 16-17, 2020)

 

The last earthquake in this area off the coast of Northern California within about 100 km of this epicenter with M>=4.7 occurred on May 5, 2019 and prior to that events of M 4.9, 5.6 and 5.2 on July 24, 2018.  Forecast 124142 had expected today's event within about 50 km was likely around May 16. More such activity is likely in coming days.

 

Like the earthquake in Sweden, this epicenter is at 103-104 degrees from the

M 6.8 in the Banda Sea of May 6, 2020 and was probably promoted by energy

from that source. An M 5.3 in Crete was also located at 103 degrees from the Banda Sea epicenter.

 

O: 18MAY2020 06:56:02  40.8N  127.4W mb=4.7  EMSC   OFF COAST OF NORTHERN CALIFORN

P: 16MAY2020 124142    40.3N  127.2W 2.5-4.5 AAAAA  Off Coast of No. Calif     

 

The strongest aftershock in the Nevada area today was an M 4.7. NEIC reported it was felt with intensity IV in Luning, Nevada and II-III in Gabbs, Hawthorne, Tonopah, and in California at Bishop, Coleville and Three Rivers. This is the strongest non-immediate aftershock in the area to date. Following is a listing of events of M>=4.0 today in the Nevada aftershock zone. A similar listing of events of M>=3 can be found in the California/Nevada regional section in this summary below. Forecast 124076 had expected this activity was likely around May 16-17.

 

O: 18MAY2020 02:19:07  38.2N  118.1W Mw=4.0  EMSC   NEVADA                       

O: 18MAY2020 02:19:07  38.2N  118.1W Mw=4.0  EMSC   NEVADA

O: 17MAY2020 21:47:44  38.2N  118.1W mb=4.3  EMSC   NEVADA

O: 17MAY2020 21:17:02  38.2N  117.8W Mw=4.7  ANSS   NEVADA

O: 17MAY2020 21:17:01  38.2N  117.8W Mw=4.1  EMSC   NEVADA

O: 17MAY2020 11:53:52  38.2N  117.9W Mw=4.3  EMSC   NEVADA

P: 16MAY2020 124076    37.3N  118.3W 2.5-5.6 AAAAA  California/Nevada area     

P: 17MAY2020 124076    38.0N  118.8W 2.5-4.5 AAAAA  California/Nevada area     

 

AFTERSHOCKS CONTINUE IN NEVADA

 

EARTHQUAKE SUMMARY FOR MAY 16, 2020

 

Seismicity continued to be dominated by aftershocks of the M 6.5 in Nevada which occurred on May 15. A number of these aftershocks were lightly felt in the area of Tonopah today. The strongest of today's aftershocks was an M 4.6 which was felt with maximum intensity IV in Pioneer, California and II-III in Nevada at Hawthorne, Tonopah, Fernley, Glenbrook, Reno. Far-field triggering may occur at nodal distances and at or near 103 and 144 degrees from this epicenter.  But this event is on the low end of those likely to trigger significant far-field activity and the Ridgecrest events of last year are not far from today's epicenter. Much of the likely far-field activity may have already been promoted by these earlier regional events in California. Areas near 103 degrees from this event in Nevada which are seismic include Papua New Guinea, New Zealand, Central Asia, the Pacific-Antarctic Ridge, the Philippines and Taiwan and eastern Turkey. Little seismicity at 144 degrees is likely - a distance which includes the Indian Ocean and the East African Rift Valley. Regional activity, however is another matter. As noted in the previous issues of this summary, this appears to be part of an activation of the Mendocino Fault inland into the northwestern U.S. As such, major enhancement can be expected on the Mendocino escarpment off the coast of Northern California. Also, the first of the Dixie Valley earthquakes in the summer of 1954 was followed by similar or larger events of M>=7 in the next six months on two occasions. The basin and range tectonic regime in this area probably encourages series of large but not great quakes and this is a possibility throughout the remainder of 2020. The end of May is a prime time for significant activity in this region of California and Nevada. The series of M>=6 events in 1980 occurred in late May in the Mammoth Lakes area. Also, in addition to the M 5.6 on May 15, 1999 in the area of the current activity an M 6.2 and 5.1 hit the region on May 17, 1993. This summary describes these as:

 

Minor damage at Independence and Lone Pine California. Felt throughout a large area of California and Nevada from San Francisco to Carson City, Ely and Las Vegas, Nevada. A large rockslide occurred about 7 km east of Eureka Valley Sand Dunes.

 

 5 17 23 20 49 1993  37.171 -117.775   7 6.2   California/Nevada area

 5 17 23 36 10 1993  37.145 -117.780  13 5.1   California/Nevada area

 

A listing of aftershocks in Nevada today of M>=3.5 follows, those of M>=3 can be found in the California regional section of this report below.

 

O: 17MAY2020 08:28:48  38.2N  117.9W Mw=3.8  EMSC   NEVADA

O: 17MAY2020 06:42:02  38.2N  117.8W ML=3.6  EMSC   NEVADA

O: 16MAY2020 23:27:13  38.1N  118.0W Mw=4.1  EMSC   NEVADA

O: 16MAY2020 11:54:23  38.2N  117.7W ML=3.6  EMSC   NEVADA

O: 16MAY2020 11:50:53  38.2N  117.7W mb=4.4  EMSC   NEVADA

O: 16MAY2020 11:49:30  38.2N  117.7W ML=3.6  EMSC   NEVADA

O: 16MAY2020 10:28:40  38.2N  117.9W ML=4.0  EMSC   NEVADA

P: 17MAY2020 124076    38.0N  118.8W 2.5-4.5 AAAAA  California/Nevada area     

 

An impressive series of moderate earthquakes occurred today in the western Fox Islands, Aleutians. The strongest of these was an M 4.9 but the series also included events of M 4.7, 4.7, 4.5 and 4.5. These are located near the ninth node (40 degrees) from the M 6.5 in Nevada of May 15 and may have been enhanced by energy from that source. The only earthquakes of larger size in the area in the past half year were an M 5.8 on October 26, 2019 and an M 5.0 on January 13, 2020. An M 4.6 on April 20, 2020 was the last similar regional event. Forecast 124164 had expected today's activity was likely within about 25 km around May 19.

 

O: 17MAY2020 05:35:13  51.8N  169.2W ML=3.8  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 17MAY2020 05:42:25  51.8N  169.2W mb=3.8  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 17MAY2020 05:52:47  52.0N  169.2W mb=3.7  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 16MAY2020 19:22:30  52.0N  169.4W mb=4.7  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 16MAY2020 16:06:53  52.1N  169.3W mb=4.7  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 17MAY2020 05:26:33  52.2N  169.4W mb=4.9  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 16MAY2020 10:06:07  52.2N  169.5W mb=4.5  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

O: 16MAY2020 19:23:33  52.2N  169.6W mb=4.5  EMSC    FOX ISLANDS, ALEUTIAN ISLANDS

P: 19MAY2020 124164    51.9N  169.2W 3.5-5.3 AAAAA  Fox Islands, Aleutians     

 

A strong tropical Cyclone exploded in the area south of eastern Pakistan today. This storm is described in this summary as:

 

TC Amphan (01B) continued today in the area south of Pakistan with winds up to 170 kts as a major cyclone. It is expected to track to the north possibly affect seismicity in eastern Pakistan and central and southeastern Asia in the next week.

 

The antipode of this is near the east Pacific Rise with the area near 103 degrees distance passing near Tonga, Fiji, New Zealand and Hawaii. Areas at 144 degrees are located in northern Central America and the Caribbean. These may see enhanced seismicity as TC Amphan makes landfall later this week.

 

Regional seismicity which may have been promoted by energy from Amphan today included an M 4.7 in Myanmar and an M 4.6 in the Delhi region of India.

 

O: 17MAY2020 04:32:15  20.5N   96.1E mb=4.7  EMSC   MYANMAR                      

P:  7MAY2020 123812    25.0N   97.0E 4.0-5.5 CCAAA  Myanmar                    

 

O: 16MAY2020 09:19:01  28.6N   76.7E MB=4.6  EMSC   HARYANA - DELHI REGION, INDIA

P: 21MAY2020 124087    30.0N   79.0E 3.8-5.2 BBBAA  India                      

 

STRONG QUAKE SHAKES NEVADA-CALIFORNIA BORDER

 

EARTHQUAKE SUMMARY FOR MAY 15, 2020

 

A strong earthquake of M 6.5 hit the area near the California-Nevada border today. NEIC reported maximum intensity VI in Benton, California; V in Silverpeak, Hawthorne, Babbs, and Round Mountain, Nevada; IV in Luning, Goldfield, Nevada and Bishop and Lee Vining, California and III in Big Pine, California among others. It was reported felt lightly as far as Arizona, Oregon, Idaho, Utah and Los Angeles, California. No major damage was reported but portions of U.S. 95 had to be shut down due to cracking in the pavement. The timing of this earthquake may have been related to tectonic plate motions induced by landfall of the first typhoon (Vongfong)  of the season in central Philippines which was simultaneous with this event in Nevada. This may be part of the recent activation of the area as described in this summary following the M 6.5 in Idaho of March 31:

 

 

"The earthquakes in Salt Lake City, Utah and Idaho are around 8 degrees from the

M 7.1 in Ridgecrest, California of July 6, 2019. A stress pulse from that event may be considered a possibility for distant triggering in both cases. A series of earthquakes near the Mendocino fault zone and inland near 40-44 degrees north latitude have occurred in the past two weeks. This summary had speculated that these were related and the earthquake in Idaho tends to reinforce that speculation. This had been noted shortly after the Utah event as:

 

"This may be part of the activation of the Mendocino fault zone inland between 39 and 41 North  Latitude. This has recently include events of M 5.8 off Northern California, an M 5.7 in Salt Lake City, Utah and a number of M>=4 events in northern California." (March 21, 2020, April 1, 2020)

 

WHY NOW:

 

While it is clear from the activity on and following April 11, that the area near the M 6.5 today was ripe for a larger earthquake, it is useful to identify  the specific geophysical phenomena which may have promoted today's event at  this time. These include: 1) The most prominent of these is Typhoon Vongfong. This is the first typhoon of the season and made landfall in Luzon, Philippines on May 14-15, 2020. at 14N 122E nearly simultaneous with the earthquake in Nevada. The distance between these two events is 103 degrees as noted in the previous issue of this summary:

 

TYPH   (Vongfong) VONGFONG 2020-05-15  00:00 UT  14.1N  121.9E   75 kts  East of Central Philippines

 

This summary has previously argued that strong surficial energy sources such as hurricanes, typhoons and earthquakes may trigger action at a distance because energy is reflected off the core-mantle boundary and is concentrated near 103 degrees distance from these events on the surface as noted in this summary on October 11, 2018 for example:

 

"Earthquake motions associated with landfall could enhance seismicity at distances similar to those associated with strong earthquakes and other energetic surficial phenomena. The two events - landfall and earthquakes occurred simultaneously." (October 11, 2018)

 

and

 

"Seismic energy from strong surficial activity on the earth reflects off the core-mantle boundary is redirected  to the surface near 103 degrees from the  mainshock. Seismicity often increases in this distance range following and may be triggered or promoted from the distant source." (June 9, 2018)

 

2) A strong storm, possibly the first tropical depression of the Hurricane Season also hit southern Florida on May 15. The first  storms of the season are particularly importance in releasing energy that has been stored and is ready for release. 3) A nor'easter about a week ago hit the northeastern U.S. It brought with it the latest measurable snowfall to Portland, Maine since 1966. This summary, most recently in relation to the activity of April 11 in Mammoth Lakes, California made a case that such storms can affect seismicity in this area. 4) Regional seismicity and the Ridgecrest M 7.1 of July 6, 2019 indicate unstable seismic conditions at this time in the area. Moderate to strong quakes in Utah and Southern Idaho probably affected the Nevada area by redistributing stress. A strong M 6.8 also occurred in northeastern Turkey in late January and was located at 102 degrees from today's activity. Energy from this source may also have contributed to the timing of today's Nevada quake.  The combination of these effects may have promoted the Nevada earthquake to occur at this time.

 

When the activity of April 11 in the general region of Mammoth Lakes occurred this summary noted:

 

"The strongest earthquake in the U.S. or Canada today was an M 5.2 which was felt widely in the Mammoth Lakes region of Central California and Nevada. NEIC reported maximum intensity IV in California at Benton, June Lake, and Yosemite National Park and in Luning Nevada. Intensity II-III was felt within about 100 km of the epicenter in California at Bishop, Coleville, Mammoth Lakes, Bridgeport and Lee Vining, and in Hawthorne, Nevada. A series of moderate aftershocks followed including an M 4.5. This is the strongest earthquake within the state of California since the M 7.1 Ridgecrest earthquake of July 6, 2019. An M 5.8 hit off the coast of California on March 9, 2020 and two events of M 5.2 each hit off the northern coast on March 18, 2020 and October 28, 2019.

It is also the strongest in the general area of eastern California and Nevada since an M 5.8 on December 28, 2016 about 40 km north of today's epicenter in Nevada. Prior to that an M 5.4-5.5 hit near today's epicenter on September 18, 2004. The possibility of a moderate quake in this area at this time has been discussed in previous issues of this summary, for example in yesterday's summary it was noted:

 

"A nor'easter hit yesterday in the area of the northeastern U.S. dropping up to 20 inches of snow in some portions of northern New England. This summary noted the likelihood of a moderate earthquake in California with storms of this type in a previous  issue as:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Mammoth Lakes, California area. NEIC reported intensity III-IV in Mammoth Lakes and northeast Fresno County and II-III within about 100 km at June Lake, Benton, Bishop, Shaver Lake, Oakhurst, Bass Lake and Yosemite.  This may be related to the strong nor'easter which was simultaneous with the M 4.9 in Southern California yesterday. A pair of light earthquakes were also felt in the San Francisco area today with M 2.4 and 2.7. California may be heading into a period of high seismicity which generally lasts from mid-April to early May and can include moderate to strong quakes near the coast. Researchers have suggested this seasonal pattern may be related to weather, percolation and rainfall. The largest event in this period in the State was an M 8.3 in San Francisco in 1906. Weather was factor in that event, although not a strong nor'easter, weather maps from this date show a strong low pressure system over the area with winds to the northeast, typical of a nor'easter. While details cannot be found the strongest snowfall event in the northeastern U.S. occurred about a week before the San Francisco earthquake - for example, measuring 15 inches on April 10 in Portland, Maine, the largest snowfall in April ever recorded. This was probably part of a regional nor'easter. More directly associated with this northeastern U.S. weather event was an M 7.5, also on April 10, 1906 in the Gulf of California - a direct precursor to the San Francisco quake. A felt foreshock to that event occurred 10 hours after the Gulf of California event in San Francisco of unknown magnitude. Unusual local winds from the east were blowing when the earthquake occurred. These strange winds were one of the prime causes of the massive fire which followed the earthquake. A strong storm dumped inches of snow in the Mammoth Lakes region today and may have helped promote this unusual earthquake of M 4.4." (April 6, 2020)

 

Like the event of April 5, a strong snowstorm also hit eastern California today. " (April 10-11, 2020)

 

This activity is located at 101 degrees from the M 6.8 in eastern Turkey of January 24 and at the sixth node (60 degrees) from the M 7.7 in the Kuril Islands of March 25 and was probably promoted by energy from those sources." (April 11-12, 2020)

 

Coincidentally, a moderately strong earthquake  hit the region exactly 21 years ago on May 15, 1999. It  was described in this summary as:

 

" 5 15 13 22 13 1999  37.494 -118.617   0 5.6   California/Nevada area

 

Small items knocked from shelves in the epicentral area. Felt in many parts of central California as far north as Placerville as far south as Valencia. Followed by a M4.6 aftershock" (May 14-15, 2020)

 

Today's event of M 6.5 is the strongest within about 100 km of this epicenter in the California-Nevada border region since the Mammoth Lakes, California swarms of M 6.5-6.7 on May 25, 1980 and July 21, 1986 and the largest in Nevada since an M 7.2 on December 16, 1954 - part of a series beginning on July 6, 1954 (M 6.8) and August 24, 1954 (M 6.8). Other similar events have rocked this area on December 21, 1932 and in 1852 and 1872, Among others, forecast 124076 had expected today's event was likely in this area around May 16. Following is a list of mainshock and aftershocks of M>=4 today. A more complete listing of events of M>=3 can be found under California region section below.

 

 

O: 16MAY2020 04:12:20  38.1N  118.0W mb=4.2  EMSC   NEVADA

O: 15MAY2020 22:15:49  38.2N  118.0W mb=4.2  EMSC   NEVADA

O: 15MAY2020 17:50:16  38.2N  117.8W mb=4.4  EMSC   NEVADA

O: 15MAY2020 17:50:16  38.2N  117.8W mb=4.4  EMSC   NEVADA

O: 15MAY2020 15:23:24  38.2N  117.8W mb=4.6  EMSC   NEVADA

O: 15MAY2020 15:23:24  38.2N  117.8W mb=4.6  EMSC   NEVADA

O: 15MAY2020 13:02:11  38.2N  117.8W ML=4.2  EMSC   NEVADA

O: 15MAY2020 12:00:40  38.2N  117.8W mb=4.0  EMSC   NEVADA

O: 15MAY2020 11:52:06  38.2N  117.9W mb=4.2  EMSC   NEVADA

O: 15MAY2020 11:30:17  38.2N  118.0W ML=4.2  EMSC   NEVADA

O: 15MAY2020 11:26:02  38.2N  117.9W Mw=4.9  EMSC   NEVADA

O: 15MAY2020 11:18:12  38.2N  117.9W ML=4.7  EMSC   NEVADA

O: 15MAY2020 11:17:26  38.1N  118.2W ML=4.6  EMSC   NEVADA

O: 15MAY2020 11:03:28  38.2N  117.9W Mw=6.5  EMSC   NEVADA                       

P: 16MAY2020 124076    37.3N  118.3W 2.5-5.6 AAAAA  California/Nevada area     

P: 17MAY2020 124076    38.0N  118.8W 2.5-4.5 AAAAA  California/Nevada area     

 

O: 15MAY2020 11:03:28   38.2N  117.9W Mw=6.5  EMSC   NEVADA                       

P: 16MAY2020 124076    37.3N  118.3W 2.5-5.6 AAAAA  California/Nevada area     

 

 

 

 

 

LARGE EARTHQUAKE REPORTED ON NEVADA-CALIFORNIA BORDER

 

EARTHQUAKE SUMMARY FOR MAY 14, 2020

 

Late reports indicate that an M 6.5 earthquake has occurred near Tonopah, Nevada east of Mammoth Lakes, California. Information about this earthquake is preliminary and will be dealt with in more detail in the next issue of this summary. The event is in a sparsely populated area and it is likely that only light to moderate  damage occurred. The last earthquake of M>=6.5 in this area occurred more than 30 years ago but the last of M>=6 was an M 6.1 on May 17, 1993. The area has been active, however, since the M 7.1 in Ridgecrest, California on July 6, 2019. The last significant activity near this location occurred in April  when an M 5.2 occurred in the general area. This summary noted that event as:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 5.2 which was felt widely in the Mammoth Lakes region of Central California and Nevada. NEIC reported maximum intensity IV in California at Benton, June Lake, and Yosemite National Park and in Luning Nevada. Intensity II-III was felt within about 100 km of the epicenter in California at Bishop, Coleville, Mammoth Lakes, Bridgeport and Lee Vining, and in Hawthorne, Nevada. A series of moderate aftershocks followed including an M 4.5. This is the strongest earthquake within the state of California since the M 7.1 Ridgecrest earthquake of July 6, 2019. An M 5.8 hit off the coast of California on March 9, 2020 and two events of M 5.2 each hit off the northern coast on March 18, 2020 and October 28, 2019. It is also the strongest in the general area of eastern California and Nevada since an M 5.8 on December 28, 2016 about 40 km north of today's epicenter in Nevada. Prior to that an M 5.4-5.5 hit near today's epicenter on September 18, 2004. The possibility of a moderate quake in this area at this time has been discussed in previous issues of this summary, " (April 12, 2020)

 

The M 5.8 on December 28, 2016 may be near today's epicenter and may be precursory to it. The entire region has seen active seismicity in recent  months including the M 6.5 in Idaho on March 31 and an M 5.7 in Utah in late March. An M 4.8 in Southern Idaho yesterday may have indicated strong regional stresses

at this time. This summary noted this event as:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.4-4.8 in the  southern Idaho aftershock zone of the March 31, 2020 M 6.5. NEIC reported today's earthquake was felt with maximum intensity IV in Idaho at Lowman and Horseshoe Bend and II-III in Stanley, Cascade, Garden Valley, McCall, Idaho City, Ketchum, Challis and Ellis. This is the strongest aftershock of the M 6.5 in southern Idaho since an immediate aftershock of M 4.8 on April 1. The last aftershock of M>=4.4 was an M 4.6 on April 11, 2020 more than a month ago. The area continues to see active conditions and more such activity is likely." (May 14, 2020)

 

More will be found in the succeeding issues of this summary. Light earthquakes today in this region included:

 

O: 14MAY2020 21:05:18  36.4N  118.0W Ml=2.1  EMSC   CENTRAL CALIFORNIA           

O: 14MAY2020 17:43:14  36.5N  118.0W Ml=2.0  EMSC   CENTRAL CALIFORNIA           

P: 16MAY2020 124075    37.1N  117.8W 2.5-5.8 AAAAA  California/Nevada area     

 

O: 14MAY2020 08:17:59  37.5N  118.9W Md=2.4  EMSC   CENTRAL CALIFORNIA           

O: 14MAY2020 08:25:49  37.5N  118.9W Md=2.5  EMSC   CENTRAL CALIFORNIA           

P: 16MAY2020 124076    37.3N  118.3W 2.5-5.6 AAAAA  California/Nevada area     

 

O: 14MAY2020 22:38:22  38.0N  118.8W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P:  8MAY2020 123823    38.0N  118.8W 2.5-4.4 CAAAA  California/Nevada area     

P: 17MAY2020 124076    38.0N  118.8W 2.5-4.5 BAAAA  California/Nevada area     

 

It was a quiet day in global seismicity. No earthquake of M>=5 were reported and seismicity in the U.S. and Canada was low.

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the central

Andreanof Islands. It was not reported felt in this remote area. The last event within about 100 km of this epicenter in the Andreanof Islands with M>=4.5 was an M 4.8 on March 24, 2020.  Forecast 124160 had expected today's event in this area around May 15.

 

O: 15MAY2020 06:51:22  50.5N  175.9W mb=4.5  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 15MAY2020 124160    51.7N  176.4W 3.5-5.3 ABAAA  Andreanoff Isls, Aleutians 

 

A moderate earthquake of M 4.4 shook the Dominican Republic today. It occurred in the northern portion of the Island. This is the largest earthquake in the northern Dominican Republic within about 100 km of this epicenter since a similar M 4.4 on November 11, 2018. The last of larger magnitude was an M 5.2 on September 23, 2018. It was accompanied by a series of forecshocks and aftershocks the largest of M 3.9 but with many in the M 3-4 range. Forecast 124056 had expected today's activity was likely around May 17.

 

NEIC reported this earthquake of M 4.4 in the Dominican Republic  was felt with intensity II-III in the area(s) of the Dominican Republic at Puerto Plata, Santiago, Bayamon.

 

 

O: 14MAY2020 08:34:10  19.8N   71.1W ML=3.0  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 09:27:48  19.8N   71.1W ML=3.0  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 09:37:33  19.8N   71.1W ML=3.0  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 21:40:12  19.8N   71.1W ML=3.0  EMSC   DOMINICAN REPUBLIC

O: 15MAY2020 03:00:45  19.8N   71.1W ML=3.0  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 18:38:01  19.8N   71.1W ML=3.3  EMSC   DOMINICAN REPUBLIC

O: 15MAY2020 03:27:18  19.8N   71.1W ML=3.3  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 22:41:33  19.8N   71.1W ML=3.4  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 18:35:15  19.8N   71.1W ML=3.5  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 21:54:59  19.8N   71.1W ML=3.6  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 21:03:57  19.8N   71.1W mb=4.4  EMSC   DOMINICAN REPUBLIC

O: 14MAY2020 07:11:39  19.9N   70.9W ML=3.0  EMSC   DOMINICAN REPUBLIC REGION

O: 14MAY2020 14:24:51  19.9N   71.1W ML=3.9  EMSC   DOMINICAN REPUBLIC REGION

O: 15MAY2020 04:10:41  19.6N   70.4W ML=3.5  EMSC   DOMINICAN REPUBLIC            

P: 17MAY2020 124056    19.0N   71.0W 3.4-5.1 AAAAA  Puerto Rico                

 

UNUSUAL, MODERATE QUAKES SHAKE IDAHO, SOUTHERN AUSTRALIA, MADAGASCAR

 

EARTHQUAKE SUMMARY FOR MAY 13, 2020

 

The strongest earthquake in the U.S. or Canada today was an M 4.4-4.8 in the southern Idaho aftershock zone of the March 31, 2020 M 6.5. NEIC reported today's earthquake was felt with maximum intensity IV in Idaho at Lowman and Horseshoe Bend and II-III in Stanley, Cascade, Garden Valley, mncCall, Idaho City, Ketchum, Challis and Ellis. This is the strongest aftershock of the M 6.5 in southern Idaho since an immediate aftershock of M 4.8 on April 1. The last aftershock of M>=4.4 was an M 4.6 on April 11, 2020 more than a month ago. The area continues to see active conditions and more such activity is likely. Forecast 123891 had expected today's event in early to mid-May.

 

O: 13MAY2020 11:32:58  44.3N  115.2W Ml=2.3  EMSC   SOUTHERN IDAHO

O: 13MAY2020 09:04:21  44.4N  114.9W Ml=3.7  EMSC   SOUTHERN IDAHO

O: 13MAY2020 18:36:26  44.4N  115.2W ML=3.0  EMSC   SOUTHERN IDAHO

O: 13MAY2020 22:36:47  44.4N  115.2W ML=3.6  EMSC   SOUTHERN IDAHO

O: 13MAY2020 08:17:42  44.4N  115.2W Ml=3.6  EMSC   SOUTHERN IDAHO

O: 14MAY2020 00:21:54  44.4N  115.2W Ml=4.8  EMSC   SOUTHERN IDAHO

O: 13MAY2020 18:30:01  44.4N  115.3W ML=2.7  EMSC   SOUTHERN IDAHO

O: 13MAY2020 17:29:45  44.5N  115.3W ML=2.5  EMSC   SOUTHERN IDAHO

O: 13MAY2020 19:18:42  44.5N  115.3W Ml=2.9  EMSC   SOUTHERN IDAHO

O: 14MAY2020 01:28:48  44.3N  115.0W Ml=3.2  EMSC   SOUTHERN IDAHO               

P:  8MAY2020 123891    44.5N  115.1W 2.0-4.0 CAAAA  Montana/Idaho              

 

The most unusual earthquake of the day was an M 4.8 in Madagascar. NEIC reported this M 4.8 was felt with intensity II-III in Madagascar at Antsirabe, Fianarantsoa, Antananarivo and Vavatenina. This is the strongest earthquake in Madagascar since an M 5.5 on January 11, 2017. Other earthquakes in the area in the past 30 years of M>=4.8 included events of M 5.0 in November, 1992 and M 5.6 on April 21, 1991. Forecast 123955 had expected enhanced activity in Madagascar to the northwest was likely in early May.

 

O: 13MAY2020 19:02:29  20.3S   47.7E mb=4.8  EMSC   MADAGASCAR                   

P:  3MAY2020 123955    18.0S   42.0E 3.0-4.6 CCCAA  Madagascar area            

 

An unusual earthquake of M 4.3 also occurred near the coast of South Australia today. NEIC reported this earthquake of M 4.3 in South Australia  was felt with intensity II-III in the area(s) of South Australia at Port Pirie and Gawler.  This is the strongest earthquake within about 300 km of this epicenter since an M 4.7 on April 29, 2014 and prior to that an M 4.6 on October 15, 2011. No damage was reported with today's event. This epicenter is at 144 degrees from the M 7.7 south of Cuba of January 28, 2020 and may have been promoted by energy from that source.

 

O: 14MAY2020 05:53:34  33.7S  138.8E ML=4.3  EMSC   NEAR COAST OF SOUTH AUSTRALIA

 

The strongest earthquake in the world today was an M 5.7 in the eastern South Pacific near Eastern Island. It was not reported felt in this remote area. The last earthquake of equal or larger size within about 300 km of this epicenter occurred September 72, 2019 with M 5.8. An M 6.3 also occurred on December 19, 2018, the first such event in the area since 2013. Forecast 123992 had expected today's event was likely to the east of this epicenter in early to mid-May.

 

O: 14MAY2020 05:55:21  35.8S  102.9W Mw=5.7  EMSC   SOUTHEAST OF EASTER ISLAND   

P:  8MAY2020 123982    36.0S   97.0W 4.0-5.5 CACAA  Chile Rise                 

 

STRONG QUAKE IN SANTA CRUZ ISLANDS

 

EARTHQUAKE SUMMARY FOR MAY 12, 2020

 

The strongest earthquake in the world today was an M 6.6 in the Santa Cruz Islands north of Vanuatu. NEIC reported it was felt with intensity I-II in Port Olry, Sanma, Vanuatu and honiara, Guadalcanal, Solomon Islands. This is the strongest earthquake in the Santa Cruz or northern Vanuatu Islands within about 200 km of this epicenter since a similar M 6.6 about 150 km south of this epicenter on January 15, 2019. The last such event of larger magnitude was an M 6.7 on April 7, 2016. Forecast 123963 had expected today's event within about 100 km of the epicenter was likely in early May.

 

O: 12MAY2020 22:41:14  12.0S  166.6E Mw=6.6  EMSC   SANTA CRUZ ISLANDS           

P:  6MAY2020 123963    13.0S  166.0E 4.0-5.4 CAAAA  Vanuatu Islands            

 

The largest earthquake in the U.S. or Canada today again occurred in the Fox Islands, Aleutians, Alaska. It was not reported felt in this remote epicentral area. Earthquakes in the Fox Islands of M>=3.8 last occurred in late April on April 23 (M 4.1) and April 20, 2020 (M 4.6). Forecast 123919 had expected today's activity in early May.

 

O: 13MAY2020 02:50:33  52.9N  167.7W mb=3.8  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  8MAY2020 123919    51.9N  169.2W 3.5-5.2 BAAAA  Fox Islands, Aleutians     

 

 

 

 

 

 

 

 

 

HAWAII SEES MAJOR SWARM IN SEAMOUNT SOUTH OF HAWAII ISLAND

 

EARTHQUAKE SUMMARY FOR MAY 11, 2020

 

An M 3.8 and 3.9 in Hawaii near the Loi'hi Seamount south of the Island of Hawaii were followed by a strong swarm of light aftershocks of M 2-3. This appears to extend the current activation of seismicity in Hawaii to this active seamount. NEIC reported the earthquakes of M 3.8 in Southern Hawaii  were felt with intensity II-III in the area(s) of Southern Hawaii at Pahoa.  This is the strongest activity in the area south of Hawaii since an M 4.0 on October 8, 2019 and prior to that an M 4.2 on August 22, 2019. The area was not active in the eruption of the summer of 2018. Forecast 123787 had expected activity in Hawaii at enhanced levels was likely in early May. This may be related to the full moon which was complete while Hawaii was at local solar noon on May 7 as noted in previous summaries:

 

"The full moon arrived at 10:45 UT on May 7, 2020. Areas which were at about 20 East longitude and 160 West longitude are most susceptible to tidal triggering" (May 5-9, 2020)

 

O: 12MAY2020 03:31:54  18.9N  155.2W ML=3.0  EMSC   HAWAII REGION, HAWAII

O: 11MAY2020 16:09:35  18.9N  155.2W ML=3.1  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 00:08:18  18.9N  155.2W ML=3.3  EMSC   HAWAII REGION, HAWAII

O: 11MAY2020 21:59:02  18.9N  155.2W ML=3.8  EMSC   HAWAII REGION, HAWAII

O: 11MAY2020 22:52:12  18.9N  155.2W ML=3.9  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 02:03:07  18.9N  155.2W Ml=3.0  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 01:25:42  18.9N  155.2W Ml=3.1  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 06:23:54  18.9N  155.2W Ml=3.2  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 01:44:08  18.9N  155.2W Ml=3.3  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 01:52:11  18.9N  155.2W Ml=3.3  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 04:51:43  18.9N  155.2W Ml=3.3  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 01:46:26  18.9N  155.2W Ml=3.4  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 02:34:04  18.9N  155.2W Ml=3.5  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 02:15:05  18.9N  155.2W Ml=3.7  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 03:58:09  18.9N  155.2W Ml=3.8  EMSC   HAWAII REGION, HAWAII

O: 11MAY2020 23:29:36  19.0N  155.2W ML=3.1  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 04:12:36  19.0N  155.2W ML=3.1  EMSC   HAWAII REGION, HAWAII

O: 12MAY2020 03:40:04  19.0N  155.2W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 12MAY2020 02:37:09  19.0N  155.3W ML=3.6  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7MAY2020 123787    19.9N  155.1W 3.0-4.5 BAAAA  Hawaii                      

 

The strongest seismicity in the U.S. or Canada today were a series of light to moderate events in the central and western Andreanof Islands, Aleutians. The largest of these was of M 4.3 far to the west. These events especially the M 3.9 in the central Andreanof Islands were accompanied by an M 4.9 at the antipode in the Bouvet Islands south of Africa. The M 4.3 in the Andreanof Islands is the strongest within about 150 km of today's epicenter since an M 4.9 on April 1, 2020 and an M 5.1 on March 3, 2020 - an aftershock of an M 5.8 on March 2. Forecast 123915 had expected today's activity in early May.

 

O: 12MAY2020 00:43:50  50.5N  177.7W mb=3.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 11MAY2020 10:42:30  51.1N  176.5W mb=3.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6MAY2020 123915    51.0N  177.1W 3.5-5.2 BAAAA  Andreanoff Isls, Aleutians 

 

O: 11MAY2020 22:53:26  51.6N  179.8W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6MAY2020 123915    51.9N  179.8W 3.5-5.0 BAAAA  Andreanoff Isls, Aleutians 

 

O: 12MAY2020 02:18:52  54.1S    3.4E mb=4.6  EMSC   BOUVET ISLAND REGION         

 

STRONG QUAKE IN JAPAN; MODERATE IN SOUTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR MAY 10, 2020

 

The strongest earthquake in the world today was an M 5.8 off the east coast of Honshu, Japan. NEIC reported maximum intensity V in Ibaraki and IV in Chiba Prefecturs with II-III in Fukushima, and Tochigi Prefectures, Japan. This is the largest earthquake within about 150 km of this epicenter since an M 6.3 on August 4, 2019. Prior to that an M 6.9 occurred in this area on November 21, 2016. The epicenter of an M 7.9 on March 11 occurred within about 20 km of today's epicenter, these appear to be aftershocks of the great M 9.3 off Honshu also on March 11, 2011. Forecast 123850 had expected today's event within this area around May 10. This event may be related to the other strong tidal enhancement of seismicity near 140 East longitude as previously noted in this summary as it occurred at 141 East longitude.

 

O: 10MAY2020 23:58:34  36.4N  141.1E Mw=5.8  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 10MAY2020 123850    37.0N  141.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

Moderately strong earthquakes of M 5.6 and 5.5 also occurred as aftershocks  in the Banda Sea, Indonesia and in the Antofagasta region of northern Chile. Both areas have been active in the past two weeks. The event in Banda is the strongest aftershock to date of the M 6.8-7.3 mainshock of May 6, 2020. Forecast 123776 had expected enhanced seismicity in the area was likely around May 8.

 

O: 11MAY2020 02:56:09   5.7S  131.1E ML=4.1  EMSC   BANDA SEA

O: 11MAY2020 01:06:18   6.0S  129.9E Mw=5.6  EMSC   BANDA SEA

O: 11MAY2020 03:29:23   6.1S  130.0E mb=4.4  EMSC   BANDA SEA                    

P:  8MAY2020 123776     7.0S  131.0E 4.0-5.6 BAAAA  West Irian, PNG            

 

GUC reported this earthquake was felt with intensity  V in  Antofagasta at Sierra Gorda; III in Antofagasta and Mejillones, Chle. NEIC reported this earthquake of M 5.5 in Atacama, Chile  was felt with intensity II-III in the area(s) of Atacama, Chile at Calama (VI) and Tocopilla, Iquique, Taltal, Antofagasta, Chile. An M 5.3-5.4 on April 30, 2020 was followed by an M 5.0 on May 8, 2020. These followed the near passage of a relatively large asteroid on April 29. But the last earthquake of larger magnitude than M 5.5 in the Antofagasta area of Chile was an M 5.6 on September 30, 2019 followed by an M 5.8 on October 6, 2019. Forecast 123967 had expected today's event within about 100 km was likely around May 11. This epicenter is at 145 degrees from the M 7.3 in the Banda Sea of May 6 and was probably promoted by energy from that source.

 

O: 10MAY2020 18:04     22.8S   68.2W mb=5.5  GUC    Antofagasta at Sierra Gorda; I

P: 11MAY2020 123967    23.0S   69.0W 4.0-5.9 AAAAA  Coast No. Chile            

 

The largest earthquake in the U.S. or Canada today was an M 4.5 in southern California. NEIC reported it was felt widely in the area with maximum shaking IV in Westmorland, Imperial, Boulevard, Jacumba, California and II-III in Pine Valley, El Centro, Thermal, Ocotillo, Borrego Springs and Julian among others.   NEIC reported an aftershock of M 2.5 in  southern California was felt with intensity II-III in the area(s) of southern California at Palm Desert.  The last earthquake within about 50 km of this epicenter with M>=4.5 occurred on August 26-27, 2012 when a series including an M 5.4 and 5.5 shook the area about 50 km east of this epicenter. An M 4.9 also occurred about 75 km to the northwest of this on April 4, 2020 and prior to that about 100 km to the southeast on November 19, 2018. Forecast 123857 had expected today's activity within about 50 km was likely around May 11. When a foreshock series hit this epicenter to the northeast on May 6 with M 3.8 and 3.9, this summary noted:

 

"The largest earthquake in the U.S. today was an M 3.9 in southern California. NEIC reported it was felt with maximum intensity IV in Calipatria and Westmorland and II-III in Brawley, Imperial, Holtville, Calexico, Santee, and Yucca Valley and with III in Mexicali, Baja California, Mexico. NEIC reported this earthquake of M 2.8 in Southern California  was felt with intensity II-III in the area(s) of Southern California at Westmorland and Imperial. Possibly the largest earthquake in the area in the past 120 years was an M 7.1-7.3 on November 21, 1915. JPL reported a close encounter with an earth-crossing asteroid occurred on the same date. Data from JPL on this event is:

 

ID:4486 Mithra (1987 SB)  DATE: 1915-Nov-21 TIME:22:33  MAGNITUDE:  15.5  MAXIMUM DIAMETER:   4.7 km

 

This was the largest earth-crossing asteroid in JPL data from this time to May 1, 1924 when a rock  with maximum diameter of 8.2 km passed nearby - an event followed by an M 7.3 earthquake in Tonga." (May 7, 2020)   

 

 

O: 10MAY2020 22:16:32  33.0N  116.0W ML=2.1  EMSC   SOUTHERN CALIFORNIA

O: 10MAY2020 22:25:13  33.0N  116.0W ML=2.3  EMSC   SOUTHERN CALIFORNIA

O: 11MAY2020 04:34:33  33.0N  116.0W ML=2.4  EMSC   SOUTHERN CALIFORNIA

O: 11MAY2020 00:44:43  33.0N  116.0W ML=2.8  EMSC   SOUTHERN CALIFORNIA

O: 11MAY2020 00:24:29  33.0N  116.0W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 11MAY2020 04:18:58  33.0N  116.0W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 11MAY2020 01:30:40  33.0N  116.0W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 11MAY2020 04:37:35  33.0N  116.0W Ml=2.4  EMSC   SOUTHERN CALIFORNIA

O: 10MAY2020 22:07:40  33.0N  116.0W Mw=4.5  EMSC   SOUTHERN CALIFORNIA          

P: 11MAY2020 123857    32.6N  116.1W 2.5-4.4 AAAAA  So. California             

 

The M 4.5 earthquake in southern California was followed by an M 3.4 in Hawaii several 13 minutes later that may have been enhanced by S-waves from California which arrived in Hawaii at this time (38 degrees). This event was reported by NEIC to have been felt with intensity II-III in Volcano, Captain Cook, Mountain View and Kailua Kona, Hawaii. This follows an increase in Hawaiian seismicity following the passage of the asteroid on April 29 and the full moon. Forecast 123787 had expected today's activity in Hawaii would be enhanced around May 7.

 

O: 10MAY2020 22:20:39  19.3N  155.4W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7MAY2020 123787    19.9N  155.1W 3.0-4.5 BAAAA  Hawaii                     

 

A light earthquake of M 3.1 occurred in western Texas today south of the active  region of recent years. An M 3.3 occurred north of this on April 4, 2020 and to the southwest on June 18, 2019 with M 3.9. Forecast 123853 expected an event in the area was likely around May 6. When an antipodal earthquake hit the Indian Ocean on May 8 (about at 50 km from the exact antipode of today's epicenter) this summary noted:

 

 

"The earthquake (of M 5.5 on May 8) in the Mid-Indian Ridge is antipodal within about 2 degrees of a series that has been occurring in Western Texas. One of these occurred about two hours after the Indian Ocean earthquake with M 2.8. An M 5.0 earthquake occurred in the Texas zone on March 26, the largest in western Texas since April 14, 1995 when an M 5.7 shook the area." (May 9, 2020)

 

NEIC reported this earthquake of M 3.1 in Western Texas  was felt with intensity II-III in the area(s) of Western Texas at Alpine and Plano.  Both the earthquakes in Western Texas and in southern California are located at 102-104 degrees from the M 6.8 in Eastern Turkey of January 24, 2020 and were probably enhanced by energy from that source.

 

O: 10MAY2020 11:16:21  30.3N  103.4W ML=3.1  EMSC   WESTERN TEXAS                

P:  6MAY2020 123853    31.5N  103.6W 2.0-4.2 BBAAA  SW U.S.A                   

 

MODERATE QUAKES SHAKE LUZON, CENTRAL PHILIPPINES

 

EARTHQUAKE SUMMARY FOR MAY 9, 2020

 

A moderate earthquake of M 5.3 was widely felt in the Luzon, Philippines region today. NEIC reported maximum intensity V in Southern Tagalog at Balaytigui, Balayan, Payapa, and Manveles, Central Luzon; IV in Cabacben and Bitangan and II-III in Calantas, Naic, Indang, and Pangili. The M 5.3 was preceded by an M 4.6 to the northeast earlier in the day. That event was reported with intensity V in Central Luzon at Gutad, and Angeles, IV in Manila and II-III in Los Banos, Obando and Imus, Philippines. The only earthquake in Luzon in the past six months with M>=5.3 was an M 5.6 on November 6, 2019. Forecast 12391 had expected this activity in Luzon within about 100 km was likely in early May.

 

O:  9MAY2020 17:03:52  13.7N  120.6E ML=4.1  EMSC   MINDORO, PHILIPPINES         

O:  9MAY2020 19:18:12  14.0N  120.6E Mw=5.3  EMSC   LUZON, PHILIPPINES           

P:  5MAY2020 123791    14.0N  122.0E 3.5-4.9 BABAA  Luzon, Philippines          

 

O:  9MAY2020 11:19:42  15.0N  122.6E mb=4.6  EMSC   LUZON, PHILIPPINES           

P:  5MAY2020 123791    14.0N  122.0E 3.5-4.9 BAAAA  Luzon, Philippines         

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in the Vancouver Island area of British Columbia, Canada. NEIC reported it was lightly felt with intensity II in British Columbia at Port MacNeill, Port Hardy and White Rock, Canada. The last earthquake within about 150 km of this epicenter with larger or equal magnitude was an M 4.7 on December 9, 2018, an aftershock of an M 5.4 on December 9, 2018. Forecast 123909 had expected today's event in this region was likely in early May. This earthquake is at 103 degrees from the M 7.3 in the Banda Sea of May 6 and was likely promoted by concentrated energy from that source.

 

When a series of foreshocks occurred near today's epicenter on May 5, this summary noted this as:

 

"A series of light earthquakes in the Vancouver Island of Canada also contained an event of M 3.8 and were lightly felt in the Port Alice, British Columbia area today. These are about 100 km southeast of the normal seismicity in this area. The last event listed by NEIC within about 100 km of the M 3.8 with equal or greater magnitude was an M 4.0 on October 29, 2018 and prior to that an M 3.9 on June 19, 2017. Forecast 123909 had expected a moderate earthquake was likely in this area around May 4." (May 6, 2020)

 

 

O: 10MAY2020 04:46:00  49.3N  127.8W MB=4.0  ECAN OF GOLD RIVER, BC              

O: 10MAY2020 04:46:01  49.5N  127.7W mb=4.7  EMSC   VANCOUVER ISLAND, CANADA REGIO

P:  4MAY2020 123909    49.2N  129.1W 2.8-5.0 CAAAA  Vancouver Island area      

 

An M 4.7 in the Unimak Island area of Alaska was also felt with intensity III in False Pass, Alaska today. This is the strongest earthquake in the Unimak area of Alaska in the past six months but recent activity including an M 4.4 on April 26, 2020 has suggested regional activation. Forecast 123930 had expected today's event within about 15 km of the epicenter was likely around May 8.

 

O:  9MAY2020 14:02:03  54.4N  163.6W mb=4.7  EMSC   UNIMAK ISLAND REGION, ALASKA 

P:  8MAY2020 123930    54.5N  163.5W 3.5-5.0 AAAAA  Unimak Islands, Aleutians  

 

An earthquake of M 3.9-4.3 was also widely felt in southern Quebec, Canada today. NEIC reported intensity IV in Quebec at Ferre-Neuve, Mont-Laurier, Shawville, and II-III in Maniwaki, Pembroke, Buckingham, Ottawa, Kanata, Eganville and Chesterville. The last earthquake of M>=4.3 in southern Quebec within about 200 km of this epicenter was an M 4.4 on May 17, 2013. Forecast 123896 had expected today's event in this region was likely in early May.

 

O:  9MAY2020 19:03:55  46.9N   75.9W MB=4.3  ECAN OF MANIWAKI, QC                

O:  9MAY2020 19:04:18  47.0N   75.9W mb=3.9  EMSC   SOUTHERN QUEBEC, CANADA      

P:  4MAY2020 123896    46.0N   75.0W 2.0-4.0 BAAAA  New York State             

 

MODERATE QUAKE SHAKES MID-INDIAN RIDGE; ANTIPODAL TO WESTERN TEXAS

 

EARTHQUAKE SUMMARY FOR MAY 8, 2020

 

The strongest earthquake in the world today was an M 5.5 on the Mid-Indian Ridge. It was not reported felt in this remote epicentral area. The last earthquake of M>=5.5 within about 500 km of this epicenter in the Indian Ocean occurred as an M 5.7 about 500 km northwest of today's epicenter on March 26, 2009. Similar earthquakes hit that epicenter on March 14, 2005, January 1, 2002 and August 28, 1999 but there have been no recorded earthquakes within 400 km of today's epicenter in the past 30 years. Forecast 123987 had expected activity in this region around May 6. Today's earthquake is at 106 degrees from the last major earthquake in the world - the M 7.7 in the Kuril Islands of March 25 and may have been promoted by energy from that source.

 

O:  8MAY2020 20:45:30  29.5S   76.6E Mw=5.5  EMSC   MID-INDIAN RIDGE             

P:  6MAY2020 123987    37.0S   79.0E 4.0-5.5 ACBAA  So. Indian Ocean           

 

The earthquake in the Mid-Indian Ridge is antipodal within about 2 degrees of a series that has been occurring in Western Texas. One of these occurred about two hours after the Indian Ocean earthquake with M 2.8. An M 5.0 earthquake occurred in the Texas zone on March 26, the largest in western Texas since April 14, 1995 when an M 5.7 shook the area. Forecast 123853 had expected today's event within about 100 km was likely around May 9.

 

O:  8MAY2020 22:57:24  31.6N  104.3W mb=2.8  EMSC   WESTERN TEXAS                 

P:  9MAY2020 123853    32.6N  104.6W 2.0-4.3 AAAAA  SW U.S.A                   

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 aftershock of the M 6.5 event in southern Idaho of March 31, 2020. Today's event was accompanied by the usual smaller aftershocks in the area. NEIC reported this earthquake of M 3.6-4.1 in Southern Idaho was felt with intensity II-III in the area(s) of Southern Idaho at Sweet, Boise, and Eagle. Forecast 123891 had expected this event was likely within the aftershocks zone around May 8.

 

O: 08MAY2020 13:04:00  44.2N  115.1W Ml=4.1  EMSC   SOUTHERN IDAHO

O: 08MAY2020 17:47:23  44.2N  115.2W ML=2.6  EMSC   SOUTHERN IDAHO

O: 09MAY2020 04:18:28  44.3N  114.9W ML=2.7  EMSC   SOUTHERN IDAHO

O: 08MAY2020 22:13:40  44.4N  115.2W ML=2.6  EMSC   SOUTHERN IDAHO

O:  8MAY2020 13:24:48  44.2N  115.1W ML=2.8  EMSC   SOUTHERN IDAHO               

P:  8MAY2020 123891    44.5N  115.1W 2.0-4.0 AAAAA  Montana/Idaho              

 

 

STRONG QUAKE IN NEW BRITAIN FOLLOWS SEISMIC PATTERN

 

EARTHQUAKE SUMMARY FOR MAY 7, 2020

 

Strong seismicity continued today near 140 East longitude, the longitude where

tidal stress was maximized in the last full and new moon. The M 7.3 in the Banda

Sea of Indonesia reported on in the last issue of this report (at 130 East longitude) was followed by an M 6.1 strong earthquake in the region of New Britain (at 154 East longitude) today and the third largest earthquake in the world today - an M 5.3 in New Britain. But global seismicity is not expected to be exceptional for the next several days with the full moon. Today's event occurred near local solar midnight and may have been promoted by tidal stresses associated with the full moon as noted in previous issues of this summary:

 

"The full moon arrived at 10:45 UT on May 7, 2020. Areas which were at about 20 East longitude and 160 West longitude are most susceptible to tidal triggering within the next five days. While the general effect of a full moon is to dampen global seismicity areas including the eastern Aleutians, Samoa, in the west and Greece and eastern Europe in the east may see enhanced seismicity at this time." (May 5-7, 2020)

 

The M 6.1 is probably an aftershock of the M 6.3 in this area of April 25, 2020.

Forecast 123773 had expected today's activity was likely around May 6.

 

O:  7MAY2020 11:21:20   4.5S  154.7E Mw=6.1  EMSC   BOUGAINVILLE REGION, P.N.G.  

P:  6MAY2020 123773     6.0S  155.0E 4.0-5.6 ABAAA  Solomon Islands            

 

An earthquake of M 5.6 also was recorded today in the South Sandwich Islands, southeast of South America. It was not reported felt in this remote epicentral area. This is the strongest earthquake in the South Sandwich Islands within about 200 km of this epicenter since an M 5.6 on October 23, 2019. The last such event in the area of larger magnitude was an M 5.8 on May 27, 2019. Forecasts 123739 and 123996 had expected this activity within about 100 km of this epicenter in late April or early May. Today's event occurred within about 30 minutes of local solar midnight and may have been promoted by tidal stresses associated with the full moon of May 7.

 

O:  8MAY2020 01:14:20  55.5S   29.3W Mw=5.6  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  4MAY2020 123996    56.0S   26.0W 4.0-5.7 BABAA  So. Sandwich Islands       

P: 29APR2020 123739    55.0S   28.0W 4.0-5.9 CAAAA  So. Sandwich Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the eastern Andreanof Islands, Aleutians, Alaska. It is the strongest earthquake within about 100 km of this epicenter since an M 4.3 on March 28, 2020. Forecast 123916 had expected activity in this area was likely around May 4.

 

O:  7MAY2020 19:16:31  52.5N  174.2W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  4MAY2020 123916    52.2N  173.9W 3.5-5.1 BAAAA  Andreanoff Isls, Aleutians 

 

The strongest earthquake in the U.S. outside Alaska today was another M 3.8 in

Hawaii.  NEIC reported this earthquake of M 3.8 in Hawaii  was felt with intensity II-III in the area(s) of Naalehu and Kailua Kona, Hawaii.  This follows similar events on each of the past three days and suggests reemergence of seismicity/volcanism after nearly two years of relative regional quiet. Forecast 123787 had expected moderate activity in Hawaii around May 7.

 

O:  7MAY2020 12:00:37  19.2N  155.4W Ml=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

O:  7MAY2020 08:55:01  19.6N  156.2W ML=3.8  EMSC   HAWAII REGION, HAWAII        

P:  7MAY2020 123787    19.9N  155.1W 3.0-4.5 AAAAA  Hawaii                      

 

STRONG EARTHQUAKE SHAKES BANDA SEA, INDONESIA

 

EARTHQUAKE SUMMARY FOR MAY 6, 2020

 

The strongest earthquake in the world today was an M 6.8 in the Banda Sea, Indonesia. NEIC reported it was felt with intensity IV in the region of Timor, Indonesia at Dili and with III-IV in Northern Territory, Australia at Darwin, Ngulu, Coonawarra, Palmerston, Howard Springs, Humpty-Doo-MacMinns Lagoos, Katherine and in Western Australia at Kununurra. BMG gave M 7.3 for this earthquake and indicated it was felt with intensity III-IV in Saumlaki; III in Banda, Dobo, Tual, Sorong, Fak-Fak, Kaiman, Tiakur; II-II in Merauke and II in Manokwari, Kupang and Waingapu, Indonesia. At M 7.3 it is the strongest earthquake in the world since the M 7.5-7.7 in northern Kurils of March 25, 2020 and an M 7.7 in the Cayman Islands of January 28, 2020. Only two other earthquakes of M>=6.8 have occurred in the world during 2020 – an M 6.8 in the Kurils on February 13, 2020 and an M 6.8 in eastern Turkey on January 24, 2020. It may have been promoted by tidal stresses associated with the full moon as  noted in previous issues of this summary:

 

 

"The full moon will arrive at 10:45 UT on May 7, 2020. Areas which are at about 20 East longitude and 160 West longitude are most susceptible to tidal triggering within the next five days. While the general effect of a full moon is to dampen global seismicity areas including the eastern Aleutians, Samoa,  and Tonga in the west and Greece and eastern Europe in the east may see enhanced seismicity at this time." (May 5-6, 2020)

 

The earthquake of M 6.8-7.3 in the Banda Sea is the largest within about  300 km of that epicenter since an M 7.3 on June 24, 2019 and prior to that an M 7.6 on January 27, 2006. Forecast 123776 had expected today's event within about 10 km of the BMG epicenter was likely around May 6. This earthquake is located at 148 degrees from the M 7.7 in the Cayman Islands of January 28 and may have been promoted by energy from that source. It is also at the sixth node (60 degrees) from the last major global event - the Kuril Island earthquake of March 25 of M 7.7 and may have been promoted by that event as well.

 

O: 06MAY2020 13:53:55   6.9S  129.8E Mw=6.8  EMSC   BANDA SEA

O: 06MAY2020 13:53:57   7.0S  130.0E Mw=7.3  BMG    BANDA SEA

O: 07MAY2020 00:39:04   6.9S  130.8E ML=4.3  EMSC   BANDA SEA

O:  6MAY2020 19:19:40   6.9S  127.5E ML=4.3  EMSC   BANDA SEA                    

P:  6MAY2020 123776     7.0S  130.0E 4.0-5.5 AAAAA  West Irian, PNG            

 

The largest earthquake in the U.S. today was an M 3.9 in southern California. NEIC reported it was felt with maximum intensity IV in Calipatria and Westmorland and II-III in Brawley, Imperial, Holtville, Calexico, Santee, and Yucca Valley and with III in Mexicali, Baja California, Mexico. NEIC reported the  earthquake of M 2.8 in Southern California  was felt with intensity II-III in the area(s) of Southern California at Westmorland and Imperial.  Possibly the largest earthquake in the area in the past 120 years was an M 7.1-7.3 on November 21, 1915. JPL reported a close encounter with an earth-crossing asteroid occurred on the same date. Data from JPL on this event is:

 

ID:4486 Mithra (1987 SB)  DATE: 1915-Nov-21 TIME:22:33  MAGNITUDE:  15.5  MAXIMUM DIAMETER:   4.7 km

 

This was the largest earth-crossing asteroid in JPL data from this time to May 1, 1924 when a rock  with maximum diameter of 8.2 km passed nearby - an event followed by an M 7.3 earthquake in Tonga.   

 

Today's event is the strongest within about 100 km of this epicenter since an  M 4.0 on November 12, 2019 and prior to that an M M 3.9 on January 17, 2019. Forecast 123857 had expected today's activity was likely within about 30 km  around May 4.

 

O: 06MAY2020 08:27:04  33.2N  115.6W ML=3.8  EMSC   SOUTHERN CALIFORNIA

O: 06MAY2020 08:27:05  33.2N  115.6W ML=3.9  ANSS   SOUTHERN CALIFORNIA

O: 06MAY2020 07:52:46  33.2N  115.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 06MAY2020 08:36:04  33.2N  115.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 06MAY2020 10:21:15  33.2N  115.6W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 06MAY2020 08:29:03  33.2N  115.6W Ml=2.8  EMSC   SOUTHERN CALIFORNIA

O: 06MAY2020 08:45:52  33.2N  115.7W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O:  6MAY2020 13:32:19  33.2N  115.6W ML=2.0  EMSC   SOUTHERN CALIFORNIA          

P:  4MAY2020 123857    32.9N  115.6W 2.5-4.4 AAAAA  So. California             

 

A pair of moderate earthquakes also occurred in the Puerto Rico Trench north of the Island today with M 4.4 and M 4.7. NEIC reported these earthquakes of M 4.4 and 4.7 in Northern Puerto Rico  were felt with intensity II-III in the area(s) of Northern Puerto Rico at Rincon, Moca, San Sebastian, Mayaguez, Lares, Orocovis, Ponce, Bayamon and Trujillo Alto. This summary has noted in past issues that this area is prone to significant seismicity as in the issue of April 29.

 

 

"The strongest earthquake in the U.S. or Possessions today was an M 3.9 north of Puerto Rico in the Puerto Rico Trench. The last event within about 100 km of this epicenter in Puerto Rico of larger magnitude was an M 4.4 on December 28, 2019 and prior to that an M 4.6 on October 7, 2019. Two events of M 3.9 have occurred in the area in the past month - on April 8 and March 29. The area is overdue for a major earthquake but this is most likely in conjunction with a major solar flare of hurricane and not immediate." (April 29, 2020)

 

A major quake hit the area on August 8, 1946 following a similar event several days earlier. This is the strongest regional event in the last century. Like today's activity and that of April 29, the events of August, 1946 were associated with a relatively large earth-crossing asteroid. That asteroid had maximum diameter about 2 km with the following JPL data:

 

 

ID:69230 Hermes (1937 UB)  DATE:1946-Aug-07 TIME:11:33  MAGNITUDE: 17.5    MAXIMUM DIAMETER:  1.9 km

 

The M 4.7 today is the strongest within about 100 km of this epicenter since an

M  6.0 on September 24, 2019.  Forecast 123805 had expected today's event was  likely around May 6.

 

O:  7MAY2020 02:59:25  19.3N   67.7W mb=4.4  EMSC   PUERTO RICO REGION           

O:  6MAY2020 21:30:43  19.3N   67.8W ML=3.7  EMSC   PUERTO RICO REGION           

O:  6MAY2020 19:00:36  19.3N   67.8W mb=4.7  EMSC   DOMINICAN REPUBLIC REGION    

O:  6MAY2020 20:12:14  19.4N   67.7W ML=3.3  EMSC   PUERTO RICO REGION           

P:  6MAY2020 123805    20.0N   68.0W 3.0-4.5 AAAAA  Bahamas/No. Caribbean      

 

There were two unusual earthquakes in Canada today. An M 4.9 in Canada's Northwest Territories was joined by an M 3.0-3.7 in southern Quebec near the Vermont border. It was widely felt. NEIC reported this earthquake of M 3.1 in Southern Quebec, Canada  was felt with intensity II-III in the area(s) of Southern Quebec, Canada at Highgate Center (IV); Bedford, Cowansville, Farnham, and in Vermont at Franklin, Sheldon, East Berkshire, Enosburg Falls, Swanton and Richford. The last earthquake of M>=3.7 listed within about 100 km of this epicenter was an M 4.5 on October 10, 2012. Forecast 123895 had expected today's activity was likely around May 4.

 

O:  6MAY2020 15:03:41  45.0N   72.9W MB=3.7  ECAN Bedford, QC. Felt              

P:  4MAY2020 123895    44.0N   73.0W 2.0-4.2 AAAAA  New England                

 

The strongest earthquake in the "U.S. or Canada today was a M 4.9 in the Northwest Territories of Canada. It was not reported felt in this remote epicentral area. This is the strongest earthquake within about 300 km of this epicenter in at least 30 years. The only comparable event on record is an M 5.5 which hit about 300 km west of this epicenter on April 13, 1922.

 

O:  6MAY2020 15:55:04  60.8N  105.3W mb=4.9  EMSC   NORTHWEST TERRITORIES, CANADA

 

An unusual, but unfelt, M 2.1 also was recorded in Illinois today. An M 2.5 hit about 50 km north of this on October 27, 2019 and prior to  that as an M 2.5 on December 9, 2018. Forecast 123843 had expected today's event within about 50 km around May 6.

 

O:  6MAY2020 12:23:28  37.9N   88.7W Md=2.1  EMSC   ILLINOIS                     

P:  6MAY2020 123843    38.0N   89.0W 2.0-4.1 AAAAA  New Madrid area             

 

MODERATE QUAKES SHAKES SAMOA

 

EARTHQUAKE SUMMARY FOR MAY 5, 2020

 

The strongest earthquake in the world today was an earthquake of M 5.5 that was felt in the region of Samoa today. NEIC reported it was felt with maximum intensity IV in American Samoa and II in Siuniu Rest of Upolu, Samoa. The last earthquake within about 150 km of this epicenter in Samoa with M>=5.5 was an M 6.0 on March 17, 2020 and prior to that an M 5.8 on November 8, 2019. A strong M 6.8 hit the area on November 4, 2017. This may be aftershocks of that event. Today's earthquake of M 5.5 occurred within about 10 minutes of local solar noon and may have been promoted by high tidal stresses which maximize near this hour.  

The full moon arrives at 10:45 UT on May 7 when this area is near local solar midnight and may also have contributed tidal stress to the area at this time as noted in this summary:

 

"The full moon will arrive at 10:45 UT on May 7, 2020. Areas which are at about 20 East longitude and 160 West longitude are most susceptible to tidal triggering within the next five days. While the general effect of a full moon is to dampen global seismicity areas including the eastern Aleutians, Samoa,  and Tonga in the west and Greece and eastern Europe in the east may see enhanced seismicity at this time." (May 5-6, 2020)

 

Forecast 123961 had expected today's event was likely in this area around May 7.

 

O:  5MAY2020 23:20:39  15.2S  172.8W mb=5.5  EMSC   SAMOA ISLANDS REGION         

P:  7MAY2020 123961    16.0S  174.0W 4.0-5.8 AAAAA  Tonga Islands              

 

Moderate seismicity also continued in the region of Tokyo, Japan today. An M 5.0 followed the M 5.6 in that region yesterday and was widely felt.  NEIC reported this earthquake of M 5.0 in Southeastern Honshu, Japan  was felt with intensity IV in the area(s) of Southeastern Honshu, Japan in Chiba and Tokyo.  In the previous summary this report had noted in this regard:

 

"This summary has been noting the enhanced seismicity of the past week near 140 East longitude which may be related to the timing of the new and full moons previously. The earthquake of M 5.6 near Tokyo today is the strongest within about 150 km of that epicenter since an M 5.6 on January 2, 2020 and prior to that an M  5.9 on July 7, 2018 and December 28, 2016.  Forecast 123850 had expected today's event was likely around May 2." (May 5, 2020)

 

O:  6MAY2020 01:16:10  37.4N  141.8E mb=4.7  EMSC   NEAR EAST COAST OF HONSHU, JAP

O:  5MAY2020 16:57:07  35.5N  140.2E Mw=5.0  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  2MAY2020 123850    37.0N  142.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

The strongest earthquake in the U.S. or Canada today was an M 3.8-3.9 in southern Hawaii. NEIC reported it was felt with intensity II-III in Hawaii at Naalehu, Captain Cook, Kailua Kona and Keaau. This follows a similar event yesterday in Hawaii as noted in the last issue of this summary as:

 

"A series of light earthquake shook the island of Hawaii today with M 3.0-4.0. NEIC reported they were felt lightly in Hawaii at Naalehu, Captain Cook, Papaikou, Honomu, Kailua Kona, Hawi and Honolulu among others. The series may indicate another potential eruption in the area such as occurred in the summer of 2018. The earthquake of M 3.8 today is the strongest in the Kilauea volcanic zone since an M 3.8 on March 19 and 21, 2020. The only other such activity in the area in the past five months occurred as an M 4.2 on February 3, 2020. A moderate event to the north of this with M 4.9 occurred November 11, 2019. Forecast 123787 had expected enhanced seismicity in Hawaii was likely around

May 7. At the time of the March activity this summary noted:

 

"This follows a similar M 3.9 in Hawaii on March 19, 2020 and suggests reinvigoration of the volcanic activity in the area." (March 22, 2020)

 

O:  6MAY2020 01:22:57  18.9N  155.8W ML=3.8  EMSC   HAWAII REGION, HAWAII        

P:  7MAY2020 123787    19.9N  155.1W 3.0-4.5 AAAAA  Hawaii                     

 

A series of light earthquakes in the Vancouver Island of Canada also contained an event of M 3.8 and were lightly felt in the Port Alice, British Columbia area today. These are about 100 km southeast of the normal seismicity in this area. The last event listed by NEIC within about 100 km of the M 3.8 with equal or greater magnitude was an M 4.0 on October 29, 2018 and prior to that an M 3.9 on June 19, 2017. Forecast 123909 had expected a moderate earthquake was likely in this area around May 4.

 

O: 05MAY2020 07:48:03  49.2N  127.9W ML=2.8  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 05MAY2020 07:57:15  49.2N  127.9W ML=3.2  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 05MAY2020 05:46:09  49.2N  127.9W MB=3.3  ECAN Port Alice, BC   

O: 05MAY2020 07:57:15  49.2N  127.9W MB=3.2  ECAN Port Alice, BC   

O: 05MAY2020 04:37:47  49.2N  127.9W MB=3.1  ECAN Port Alice, BC   

O:  5MAY2020 22:34:48  49.2N  127.9W MB=3.8  ECAN Port Alice, BC                 

O:  5MAY2020 22:34:48  49.2N  127.9W ML=3.8  EMSC   VANCOUVER ISLAND, CANADA REGIO

P:  4MAY2020 123909    49.2N  129.1W 2.8-5.0 AAAAA  Vancouver Island area      

 

The effects on seismicity  from the relatively large asteroid which made a close encounter with earth on April 29 are largely over. Study of previous such  events suggest that major earthquakes, if they occur with the closest approach of such objects, rarely trigger significant seismicity more than 6 days from  the encounter. Thus, a large earthquake is still possible in the next day, but unlikely following that due to the effects of the close passage. Other stresses such as tidal stresses associated with moon and sun then take over in helping promote seismicity. In researching the relation between close asteroid encounter with earth and large earth movements an event that occurred 100 years ago stood out. This was an  M 8.5-8.8 in Southern China on December 16, 1920. Some researchers suggest that this is the strongest non-subduction earthquake in the world in more than 100 years, possibly the largest ever recorded. The history section of this summary described this events as:

 

The greatest known landslide in history was caused by this earthquake in Kan Sou, China. Whole mountains moved as evidenced by a section of road nearly a mile in length which was move a mile from its former location without disturbing the trees alongside the road. Many inhabitants of the area lived in caves in the mountain and were killed in the landslides. The slide was in loess which when watered and shaken can act as a fluid. Felt with damage over an area of about 600,000 sq. miles and destructive over about 15,000 sq. miles. The earthquake was felt over about 1,500,000 sq. miles. Loss of life was estimated at about 100,000 chiefly from the landslides. A strong sandstorm began in Mongolia after the earthquake from dust thrown up from the earthquake and landslides. The windstorm caused several additional deaths. A second shock occurred in the same area on May 23, 1927 but was not as damaging since the movable loess had already been transported.

 

A relatively large asteroid with largest diameter of about 2 km made its closest approach to earth within about 3 hours of this earthquake. This event is identified by JPL as:

 

ID:7822 (1991 CS)  DATE:1920-Dec-16 TIME:13:38 MAGNITUDE:17.4    DIAMETER:880 m -  2.0 km