STRONG QUAKE IN BANDA SEA FELT IN NORTHERN TERRITORY, AUSTRALIA

 

EARTHQUAKE SUMMARY FOR FEBRUARY 25, 2020

 

EMSC reported this earthquake was felt with light intensity in northwestern Australia and Darwin and Coolalinga. NEIC added Humpty Doo-MacMinns Lagoon, Nguiu, Palmerston and Howard Springs, Northern Territory, Australia to sites feeling this earthquake with intensity II-III. Strong earthquakes in the Banda Sea are often felt in northern Australia due to the depth of these events and the cone of felt effects. This earthquake in the Banda Sea is the strongest within about 200 km of this epicenter since an M 5.9 on September 21, 2019 with the largest of greater magnitude in the area an M 7.3 on June 24, 2019 about 250 km to the northwest of today's epicenter. Forecast 122125 had expected today's event was likely within about 100 km around February 27. This event may also have been promoted by high tidal stresses associated with the new moon of February 26 as it occurred near the longitude where these were maximized as noted in previous issues of this summary:

 

"The New Moon  arrived on February 23, 2020 at 15:32 UT. Longitudes which were sub-solar at this time are near 52 West while those antisolar are at 128 East longitude. These include areas of the Central Atlantic such as Puerto Rico and the South Sandwich Islands in the west and central Indonesia, the Philippines and Japan in the east. A strong tidally enhanced earthquake is possible in the next six days. Other tidal enhancement would promote larger quakes near local solar noon and midnight. Many other areas of the earth can also see tidal enhancement of seismicity at this time." (February 22-25, 2020)

 

O: 26FEB2020 07:33:11   7.6S  131.2E Mw=5.9  EMSC   KEP. TANIMBAR REGION, INDONESI

P: 27FEB2020 122125     7.0S  130.0E 4.0-5.3 AAAAA  West Irian, PNG            

 

Seismicity in eastern Turkey to Kazakhstan continued at an elevated level today. This include an M 5.0 in Western Kazakhstan; an M 5.0 in eastern Turkey and continuing aftershocks of M 4.4 and 4.2 in the region of the Turkey-Iran border. The M 5.0 earthquake was felt today in the region of Eastern Turkey. This is an aftershock of the M 6.8 of January 24 in the area but not an aftershock of the recent M 6.0 to the southeast of this two days ago. It was felt with maximum intensity IV in Malatya, Yesilyurt, Elazig, Diyarbalir, Ebistan and Gaziantep, Turkey. This earthquake is at 103 degrees from the M 7.7 south of Cuba of January 28 and, like much of the regional activity in the past several weeks, have been promoted by energy from that source. Forecast 122007 had expected a moderate earthquake in Kazakhstan around February 21.

 

O: 26FEB2020 07:51:26  41.8N   52.1E mb=5.0  EMSC   WESTERN KAZAKHSTAN           

P: 21FEB2020 122007    40.0N   50.0E 4.0-5.3 BBBAA  Kazakhstan                 

 

The events in eastern Turkey were aftershocks of strong regional earthquakes of the past month and had been expected at this time in forecasts 121995 and 122219.

 

O: 25FEB2020 23:03:38  38.3N   38.8E mb=5.0  EMSC   EASTERN TURKEY               

P: 18FEB2020 121995    39.0N   40.0E 3.5-4.8 CAAAA  Turkey                     

 

O: 25FEB2020 22:28:15  38.4N   44.4E mb=4.4  EMSC   TURKEY-IRAN BORDER REGION    

O: 25FEB2020 14:14:02  38.4N   44.5E mb=4.5  EMSC   TURKEY-IRAN BORDER REGION    

P: 24FEB2020 122219    39.0N   44.0E 3.5-4.8 AAAAA  Caucasus/Caspian Sea       

 

An unusual earthquake was recorded in Namibia, southern Africa today with  M 3.1. This epicenter is at 102 degrees from the M 7.7 south of Cuba of January 28 and may have been promoted by energy from that source. The last earthquake within about 300 km of this epicenter in Namibia of M>=3.1 was an M 4.1 on May 24, 2010, the only such event in this area in the past 30 years.

 

 

O: 25FEB2020 15:23:57  26.7S   15.1E ML=3.1  EMSC   NAMIBIA                      

 

QUAKES FELT IN SOUTHERN ITALY AND NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR FEBRUARY 24, 2020

 

An M 4.6-4.8 quake was felt today in the region of Southern Italy. NEIC reported maximum intensity VII in Rende, Calabria and VI in Cosenza and Milazzo, Sicily and possibly in Bologna, more than 600 km north of the epicenter. The M 4.8 was preceded by an M 3.4 to the west of it about 6 minutes before. This is the strongest earthquake in southern Italy within about 100 km of this epicenter since an M 4.9 on April 5, 2014. The last of M>=4.6 was an M 4.6 on October 25, 2019 to the east of today's epicenter. Forecast 122183 had expected this activity was likely around February 26.

 

O: 24FEB2020 16:02:58  39.3N   16.2E ML=4.6  EMSC   SOUTHERN ITALY               

O: 24FEB2020 15:56:54  39.4N   15.1E ML=3.4  EMSC   SOUTHERN ITALY               

P: 26FEB2020 122183    38.0N   15.0E 3.0-4.4 ABAAA  Mediterranean/Sicily       

 

An earthquake of M 4.8-5.5 occurred today in the South Island of New Zealand.

GEONET reported 375 people felt this quake with 284 with weak intensity; 88 with light intensity and 3 with moderate intensity. None  reported strong shaking and 0 extreme intensity. NEIC reported this earthquake of M 4.8-5.5 in South Island, New Zealand  was felt with intensity II-III in the area(s) of South Island, New Zealand at Te Anau, Queenstown and Wanaka, Otago. The last quake within about 200 km of this epicenter with M>=5.5 occurred on May 15, 2015 with M 5.6 and prior to that as an M 6.1 on August 5, 2009. Forecast 122315 had expected today's event within about 100 km was likely around February 29. This epicenter is at the third node (120 degrees) from the M 7.7 South of Cuba of January 28. An earthquake in the Bonin Islands of M 4.8 today was also at this distance from Cuba.

 

O: 24FEB2020 10:14:22  44.7S  167.4E mb=4.8  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 24FEB2020 10:14:22  44.7S  167.5E ML=5.5  GEONET reported 375 people felt this quake

P: 29FEB2020 122315    44.0S  169.0E 3.0-4.8 BAAAA  So. Island, N.Z.            

 

The strongest earthquake reported by NEIC or EMSC today was an M 5.2 in the region of Fiji. This event may have been enhanced by Tropical cyclone Wasi as previously noted in this summary as:

 

"Tropical cyclone Wasi (18P) continued today in the area of Samoa with winds up to 50 kts. Stresses from this storm may enhance regional seismicity in Samoa and northern Tonga over the next four days with a moderate to strong regional quake possible in this time frame." (February 20-22, 2020)

 

This earthquake, like those in Eastern Europe and the Kuril Islands is located at 103 degrees from the M 7.7 south of Cuba of January 28. These are the only active seismic zones at this distance from that event and may continue to see enhanced seismicity in coming days.

 

O: 25FEB2020 02:07:28  17.7S  178.9W mb=5.2  EMSC   FIJI REGION                  

P: 28FEB2020 122294    19.0S  178.0W 4.0-5.4 BBAAA  Tonga Islands              

 

SECOND STRONG EARTHQUAKE ON IRAN-TURKEY BORDER

 

EARTHQUAKE SUMMARY FOR FEBRUARY 23, 2020

 

The strongest earthquake in the world today was an M 6.0 on the Turkey-Iran border in eastern Turkey. It is a co-mainshock with the M 5.7 which hit the area yesterday. Today's event was reported by NEIC to have been felt with maximum intensity VII in Azerbaijan and Iran at Dilman; IV in Iran at Orumiyeh, Tebriz and II-II in Merand, Yerevan, Armenia, Arbil, Iraq and in Sarband and Tehran, Iran. When the M 5.7 occurred earlier this summary noted in the previous issue:

 

"The strongest earthquake in the world today was an M 5.7 in eastern Turkey near the Iran border. NEIC reported it was felt with intensity VII in Ozalp, Van, Turkey and in Iran at Khoi Azarbayenj-e, Gharbi and Orunmiyeh, Azarbaijan. This is the strongest earthquake in the region within about 200 km of this epicenter since an M 6.4 on August 11, 2012. Today's event was probably promoted by the new moon today as it occurred near local solar noon at the epicenter. Forecasts 122002 and 122219 had expected this activity within about 100 km was likely around February 21-24. This epicenter is located at 102 degrees from the M 7.7 south of Cuba of January 28, 2020 and was probably promoted by energy from that source." (February 22-23, 2020)

 

Following the earthquake in Cuba of January 28, 2020 this summary had noted that strong seismicity in the region of eastern Turkey and the Kuril Islands was likely as triggered seismicity as:

 

"The earthquake near Cuba may reset global seismicity as it is the strongest in nearly a year in the world. Far-field triggering is most likely in eastern Turkey, Iran/Iraq and the east African Rift valley as well as in Hokkaido and northern Japan (103 degrees)" (January 29, 2020; repeated following the M 7.0 in the Kuril Islands on February 13-14, 2020)

 

and

 

"A major earthquake of M 6.9-7.0 shook regions of the Kuril Islands today. NEIC reported maximum intensity V in Hokkaido and IV in Sakhalin, Russia. Intensity II-IV was reported from areas of Hokkaido within about 500 km of the epicenter.

This epicenter is at 102-103 degrees from the M 7.7 south of Cuba on January 28, and the first major quake in the world since that time. Seismic energy from large earthquakes concentrates at the surface around 102-103 degrees from the mainshock epicenter after reflection and refraction off inner earth boundaries." (February 13-14, 2020)

 

This area of Turkey-Iran border first became active on February 16, 2020 with an M 4.8 foreshock. The last earthquake within about 200 km of today's M 6.0 with equal or larger magnitude occurred on August 11, 2012 with M 6.3 and 6.4 about 200 km east of today's epicenter. The only other such event in the region in the past 30 years was an M 7.1-7.3 on October 23, 2011. Forecast 122219 had expected today's activity was likely around February 24. Today's activity is at 102-103 degrees from both the M 7.1 in Central California of July 6, 2019 and from the M 7.7 south of Cuba of January 28, 2020. It is also at the fifth node (72 degrees) from the M 7.0 in the Kuril Islands of February 13 and may have been promoted by energy from these events.

 

O: 23FEB2020 10:25:40  38.4N   44.4E mb=4.1  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 16:56:21  38.4N   44.5E ML=4.0  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 17:00:40  38.4N   44.5E ML=4.0  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 20:44:36  38.4N   44.5E ML=4.0  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 16:37:50  38.4N   44.5E mb=4.2  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 14:28:39  38.4N   44.5E mb=4.3  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 16:00:29  38.4N   44.6E Mw=6.0  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 16:39:57  38.5N   44.5E mb=4.1  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 09:48:21  38.5N   44.5E mb=4.4  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 16:54:37  38.5N   44.5E mb=4.5  EMSC   TURKEY-IRAN BORDER REGION

O: 23FEB2020 16:20:19  38.4N   44.4E mb=4.0  EMSC   TURKEY-IRAN BORDER REGION    

P: 24FEB2020 122219    39.0N   44.0E 3.5-4.8 AAAAA  Caucasus/Caspian Sea       

 

Moderate earthquakes of M 4.7 and M 4.8 also continued in western Turkey today.

NEIC reported this earthquake of M 4.6 in Western Turkey  was felt with intensity II-III in the area(s) of Western Turkey at Izmir, Buyukorhan, Bursa and Mudanya. A smaller M 4.4 earlier in the day was felt with intensity IV in Akhisar and II in Izmir. These appear to be aftershocks of an M 5.6 at this epicenter on January 22, 2020. The last similar aftershock was an M 4.8 on February 18. Forecast 12221 had expected today's activity was likely around February 24.

 

O: 23FEB2020 12:40:18  39.0N   27.9E ML=4.8  EMSC   WESTERN TURKEY

O: 24FEB2020 02:43:33  39.0N   27.9E mb=4.7  EMSC   WESTERN TURKEY               

P: 24FEB2020 122211    37.0N   28.0E 3.5-5.0 ABAAA  Turkey                     

 

The second strongest earthquake in the world today was an M 5.2 in the Kuril Islands. This is the strongest aftershock to date of the M 7.0 in the area which occurred February 13. It joined a series of moderate quakes in the region of eastern Japan today. Forecast 122243 had expected today's event was likely around February 24. As noted above this epicenter is also at 102-103 degrees from the M 7.7 south of Cuba of January 28.

 

O: 23FEB2020 12:57:08  45.7N  148.4E mb=5.2  EMSC   KURIL ISLANDS                

P: 24FEB2020 122243    45.0N  149.0E 3.5-5.4 AAAAA  So. Kurils                 

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in the Kenai Peninsula, Alaska. NEIC reported this earthquake of M 3.5 in the Kenai Peninsula, Alaska  was felt with intensity II-III in the area(s) of the Kenai Peninsula, Alaska at Kenai, Sterling, Soldotna, Anchorage and Wasilla.  The last event in the Kenai Peninsula of M>=3.7 was an M 3.7 on February 7, 2020 about  200 km southeast of today's epicenter. Forecast 122268 had expected today's earthquake within about 50 km was likely around February 26.

 

 

O: 23FEB2020 16:15:42  60.9N  151.2W ML=3.7  EMSC   KENAI PENINSULA, ALASKA      

P: 26FEB2020 122268    60.2N  151.7W 3.2-4.8 BAAAA  Central Alaska             

MODERATELY STRONG QUAKE SHAKES EASTERN TURKEY-IRAN BORDER

 

EARTHQUAKE SUMMARY FOR FEBRUARY 22, 2020

 

The strongest earthquake in the world today was an M 5.7 in eastern Turkey near the Iran border. NEIC reported it was felt with intensity VII in Ozalp, Van, Turkey and in Iran at Khoi Azarbayenj-e, Gharbi and Orunmiyeh, Azarbaijan.

This is the strongest earthquake in the region within about 200 km of this epicenter since an M 6.4 on August 11, 2012. Today's event was probably promoted by the new moon today as it occurred near local solar noon at the epicenter. Forecasts 122002 and 122219 had expected this activity within about 100 km was likely around February 21-24. This epicenter is located at 102 degrees from the M 7.7 south of Cuba of January 28, 2020 and was probably promoted by energy from that source.

 

O: 23FEB2020 05:52:58  38.4N   44.5E Mw=5.7  EMSC   TURKEY-IRAN BORDER REGION    

P: 21FEB2020 122002    40.0N   44.0E 3.5-4.8 ABAAA  Caucasus/Caspian Sea       

P: 24FEB2020 122219    39.0N   44.0E 3.5-4.8 AAAAA  Caucasus/Caspian Sea       

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 off the coast of Northern California. NEIC reported it was felt with intensity II-III in California at Petrolia, Ferndale, Rio Dell, Fortuna, Eureka, Whitethorn, Carlotta, Myers Flat and Redway. This event may have been promoted by the new moon as it occurred within half an hour of local solar noon. The new moon arrived today as noted in previous issues of this summary:

 

"The New Moon will arrive on February 23, 2020 at 15:32 UT. Longitudes which are sub-solar at this time are near 52 West while those antisolar are at 128 East longitude. These include areas of the Central Atlantic such as Puerto Rico and the South Sandwich Islands in the west and central Indonesia, the Philippines and Japan in the east. A strong tidally enhanced earthquake is possible in the next six days. Other tidal enhancement would promote larger quakes near local solar noon and midnight. Many other areas of the earth can also see tidal enhancement of seismicity at this time." (February 21-22, 2020)

 

This event is the strongest within about 100 km of this epicenter since an M 5.2 on October 28, 2019 and prior to that an M 5.6 on June 23, 2019 in the regional activation of June and early July 2019. Forecast 122235 had expected today's event within about 25 km of this epicenter was likely around February 23. This epicenter is at the sixth node (60 degrees) from the M 7.0 in the Kuril Islands of February 13, 2020 and was probably promoted by energy from that epicente

 

O: 22FEB2020 19:14:24  40.3N  125.0W Mw=4.4  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 23FEB2020 122235    40.6N  124.9W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

A series of moderate earthquakes occurred today in the West Chile Rise. The largest of these as of M 5.5 and M 5.1. They were not reported felt in this remote area. The M 5.5 is the strongest within about 200 km of this epicenter since an M 5.9 on May 6, 2014. Forecast 122085 and 122312 had expected moderate activity southeast of these epicenters was likely around February 21-23.  This activity is at 144 degrees from the M 6.8 of January 24, 2020 in eastern

Turkey and may have been enhanced by energy from that source. It is also at the sixth node (60 degrees) from the M 7.7 south of Cuba of January 28, 2020.

 

O: 22FEB2020 23:12:36  38.1S   93.7W Mw=5.5  EMSC   WEST CHILE RISE

O: 22FEB2020 23:19:02  38.3S   93.9W mb=5.1  EMSC   WEST CHILE RISE

O: 22FEB2020 14:44:40  38.8S   92.3W mb=4.3  EMSC   WEST CHILE RISE

O: 23FEB2020 01:40:33  37.9S   92.2W mb=4.3  EMSC   WEST CHILE RISE              

P: 21FEB2020 122085    41.0S   88.0W 4.0-5.3 ACCAA  Chile Rise                 

P: 23FEB2020 122312    41.0S   88.0W 4.0-5.3 ACCAA  Chile Rise                 

 

Seismicity was also up in the Southwest Pacific today where the second strongest earthquake of the day - an M 5.6 and 5.2 occurred in central Tonga. These were not reported felt in this area. They were probably enhanced or promoted by  Tropical cyclone Wasi which was passing through the area at the time of these events. This had been expected in previous issues of this summary as:

 

"Tropical cyclone Wasi (18P) continued today in the area of Samoa with winds up to 50 kts. Stresses from this storm may enhance regional seismicity in Samoa and northern Tonga over the next four days with a moderate to strong regional quake possible in this time frame." (February 20-22, 2020)

 

The M 5.6 is the strongest earthquake within about 200 km of this epicenter in  Tonga since an M 6.1 on June 15, 2019. Most activity at this magnitude level in the past three years has occurred north of today's epicenter. Forecast 122075 had expected today's event within about 50 km was likely around February 19. This activity is at 146 degrees from the M 6.8 of January 24, 2020 in eastern  Turkey and may have been enhanced by energy from that source. Also, like the event in eastern Turkey today this activity is located at 102 degrees from the M 7.7 south of Cuba of January 28, 2020 and was probably promoted by energy from that source.

 

O: 22FEB2020 18:50:22  21.7S  174.3W mb=5.2  EMSC   TONGA                        

O: 22FEB2020 19:46:14  22.3S  174.8W Mw=5.6  EMSC   TONGA REGION                 

P: 19FEB2020 122075    22.0S  175.0W 4.0-5.3 BAAAA  Tonga Islands              

 

O: 22FEB2020 10:34:05  15.1S  177.3W mb=4.1  EMSC   FIJI REGION                  

P: 23FEB2020 122288    15.0S  176.0W 4.0-5.6 AAAAA  Samoa Islands              

 

UNUSUAL SEISMICITY IN SOUTHERN; BAJA CALIFORNIA

 

EARTHQUAKE SUMMARY FOR FEBRUARY 21, 2020

 

A light to moderate earthquake shook the valleys west of Los Angeles today. NEIC reported this event of M 3.5-3.9 was felt with intensity II-III in Castaic, Valencia, Santa Clarita, Stevenson Ranch, Canyon County, Lake Hughes, Newhall, Los Angeles, Northridge, San Fernando and in general within about 100 km of the epicenter.

 

This activity had been expected at this time as reported in the previous issue of this summary:

 

 

"The strongest earthquake felt in the U.S. or Canada outside Alaska today was an M 3.2-3.3 in the Ridgecrest area of Southern California. NEIC reported it was felt with intensity II-III in Ridgecrest and Wofford Heights, California.

Some evidence suggests that Southern California, and especially the valleys west of Los Angeles, may see enhanced seismicity at this time. When an M 6.0 in New Guinea at 103 degrees from Southern California occurred this summary suggested:

 

"The strongest earthquake in the world today was an M 6.0-6.1 in northern New Guinea. NEIC reported it was felt with intensity IV in Aberpura, Papua New Guinea, Indonesia. Strong earthquakes in this area can affect seismicity in the Los Angeles area of California as it is located at 103 degrees from this. Major quakes in New Guinea are often followed by moderate to strong quakes in southern California about a month later. Major quakes in California often occur in January and February (for example San Fernando - February 9, 1971 and Northridge - January 16, 1994). Today's event is not large enough to trigger this large an event but may be precursory to larger regional events in New Guinea." (January 19, 2020)

 

When an M 4.5 on the Kansas-Nebraska border followed the next day this summary followed up on this with:

 

"While this appears to be part of the general increased seismicity in Oklahoma and Kansas, the enhanced magnitude may indicate precursory activity to a moderate earthquake along the western edge of the North American plate in the next several weeks." (January 19-20, 2020)

 

The area of southern California where increased seismicity was expected saw a moderate M 4.6 on January 25 near Barstow and M 4.4 in the Mammoth Lakes region of Central on February 1, 2020, but to day the area of Los Angeles has been relatively quiet." (February 20-21, 2020)

 

The last earthquake within about 50 km of today's epicenter in western Los Angeles, California occurred more than five years ago on January 4, 2015 with M 4.2. An M 4.1 also occurred slightly west of this on March 12, 2016. Forecast 121983 had expected regional seismicity around February 18. This epicenter is located at  104 degrees from the M 6.8 in Turkey of January 24 and may have been promoted by energy from that source.

 

O: 21FEB2020 13:42:53  34.5N  118.6W ML=3.9  EMSC   SOUTHERN CALIFORNIA          

P: 18FEB2020 121983    33.9N  118.3W 2.5-4.3 BAAAA  So. California             

 

The activity in Southern California was joined by unusual quakes to the south in the area of Baja California. The strongest of these was an M 4.0 west of Baja California in a very unusual epicenter. The M 4.0 off the coast of Baja California is the strongest within about 100 km of that epicenter since an M 4.2 on July 8, 2014. Unusual events such as this can often signal unusual stresses which can lead to stronger regional events down the road. Forecast 121979 had expected an event to the east in mid-February. This activity is at the fifth node (72 degrees) from the M 7.0 in the Kuril Islands of February 13, 2020 and may have been promoted by energy from that event.

 

O: 22FEB2020 05:34:08  30.0N  116.4W ML=4.0  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 14FEB2020 121979    30.2N  114.1W 2.0-3.8 CABAA  SW U.S.A                   

 

An M 3.5 north of this was the strongest within about 100 km since an M 4.0 on

January 12, 2020 and an M 3.9 on December 11, 2019. Forecast 121980 had

expected this activity within about 50 km in mid-February.

 

O: 21FEB2020 11:04:24  31.7N  115.6W ML=3.5  EMSC   BAJA CALIFORNIA, MEXICO       

O: 22FEB2020 02:00:01  31.9N  115.6W ML=2.3  EMSC   BAJA CALIFORNIA, MEXICO

O: 22FEB2020 02:10:21  32.3N  115.4W Ml=2.2  EMSC   BAJA CALIFORNIA, MEXICO

O: 22FEB2020 03:40:40  32.4N  115.4W Ml=2.1  EMSC   BAJA CALIFORNIA, MEXICO

P: 14FEB2020 121980    32.4N  115.4W 2.5-4.3 CAAAA  So. California             

 

The strongest earthquake in the U.S. or Canada and in the world today was an M 5.2 in the active area of the western Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote region. This is the largest quake in the western Andreanof Islands since an M 5.4 event on  January 28. That was an aftershock of event of M 6.2 and 6.1 on January 23 and 26. Forecasts 122031 had expected today's activity within about 50 km was likely in mid-February.

 

O: 21FEB2020 10:20:14  51.0N  179.3W Mw=5.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 21FEB2020 10:24:32  51.0N  179.3W mb=4.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 15FEB2020 122031    51.1N  180.0W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

 

M 5.9 SHAKES KAMCHATKA

 

EARTHQUAKE SUMMARY FOR FEBRUARY 20, 2020

 

The strongest seismicity in the world today continued at high latitudes and near the geomagnetic equator. This included events of M 5.9 in Kamchatka at high latitude and of M 5.4-5.5 in the Banda Sea, Indonesia and Mindanao, Philippines near the equator. This may be related to the geomagnetic storm of the past several days as noted in the previous issues of this summary:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field also saw minor storm conditions  with AP at 36. Active conditions in the geomagnetic field are often accompanied by an upswing in global seismicity especially at high latitudes and near the geomagnetic equator." (February 18-29, 2020)

 

The largest earthquake in the world today occurred as an M 5.7-5.9 in Kamchatka. It may have been felt with intensity V in Mohovaja, Kamchatka. At M 5.9 this is the strongest earthquake within about 150 km of this epicenter in Kamchatka since an M 6.4 on March 20, 2016 and prior to that an M 6.6 on November 12, 2013. Forecast 122033 had expected today's event was likely in this area around February 20. This epicenter is at the fourth node (90 degrees) from the M 7.7 in Cuba of January 28 and may have been promoted by energy from that source.

 

O: 20FEB2020 18:57:36  53.7N  160.6E Mw=5.9  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 20FEB2020 122033    54.0N  162.0E 4.0-5.3 AAAAA  E. of Kamchatka            

 

An M 5.4 in the Banda Sea was also felt today. NEIC reported it was lightly felt with intensity II in Northern Territory, Australia at Coonawarra, Darwin and Katherine. Forecast 121889 had expected this activity in mid-February.

 

O: 20FEB2020 20:24:28   6.8S  129.7E Mw=5.4  EMSC   BANDA SEA                    

P: 16FEB2020 121889     8.0S  128.0E 4.0-5.4 BBBAA  Banda Sea                  

 

In Mindanao, Philippines, an M 5.4 event occurred today and was reported by NEIC to have been felt with intensity III in Buayan, Southern Philippines. Forecast 121885 had expected this activity in mid-February.

 

O: 20FEB2020 09:54:06   5.7N  125.6E Mw=5.4  EMSC   MINDANAO, PHILIPPINES        

P: 18FEB2020 121885     2.0N  125.0E 4.0-5.3 ACAAA  Mindanao, Philippines      

 

The strongest earthquake in the U.S. or Canada today was an M 3.6 in Central Alaska. The last earthquake of M>=3.6 within about 100 km of today's epicenter was an M 3.7  on February 2, 2020 and prior to that an M 3.7 on January 14 and an M 3.9 on January 11. Forecast 122049 had expected activity in this area around February 19. NEIC reported this earthquake of M 3.3 in  Central Alaska was felt with intensity II-III in the area(s) of Central Alaska at Fairbanks, Fort Wainwright, North Pole, Eielson, Delta Junction.

 

O: 20FEB2020 09:32:51  64.9N  149.1W ML=3.6  EMSC   CENTRAL ALASKA               

P: 19FEB2020 122049    63.1N  151.9W 3.2-4.8 ABAAA  Central Alaska             

 

The strongest earthquake felt in the U.S. or Canada outside Alaska today was an M 3.2-3.3 in the Ridgecrest area of Southern California. NEIC reported it was felt with intensity II-III in Ridgecrest and Wofford Heights, California.

Some evidence suggests that Southern California, and especially the valleys west of Los Angeles, may see enhanced seismicity at this time. When an M 6.0 in New Guinea at 103 degrees from Southern California occurred this summary suggested:

 

"The strongest earthquake in the world today was an M 6.0-6.1 in northern New Guinea. NEIC reported it was felt with intensity IV in Aberpura, Papua New Guinea, Indonesia. Strong earthquakes in this area can affect seismicity in the Los Angeles area of California as it is located at 103 degrees from this. Major quakes in New Guinea are often followed by moderate to strong quakes in southern California about a month later. Major quakes in California often occur in January and February (for example San Fernando - February 9, 1971 and Northridge - January 16, 1994). Today's event is not large enough to trigger this large an event but may be precursory to larger regional events in New Guinea." (January 19, 2020)

 

When an M 4.5 on the Kansas-Nebraska border followed the next day this summary followed up on this with:

 

"While this appears to be part of the general increased seismicity in Oklahoma and Kansas, the enhanced magnitude may indicate precursory activity to a moderate earthquake along the western edge of the North American plate  in the next several weeks." (January 19-20, 2020)

 

The area of southern California where increased seismicity was expected saw

a moderate M 4.6 on January 25 near Barstow and M 4.4 in the Mammoth Lakes region of Central on February 1, 2020, but to day the area of Los Angeles has been relatively  quiet.

 

O: 20FEB2020 08:53:19  35.6N  117.5W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 21FEB2020 03:11:41  35.7N  117.5W ML=2.1  EMSC   SOUTHERN CALIFORNIA

O: 21FEB2020 01:10:26  35.8N  117.6W Ml=2.5  EMSC   CENTRAL CALIFORNIA

O: 20FEB2020 07:12:30  35.9N  117.7W ML=2.5  EMSC   CENTRAL CALIFORNIA

O: 20FEB2020 19:00:18  35.6N  117.4W Ml=2.4  EMSC   SOUTHERN CALIFORNIA          

P: 18FEB2020 121950    35.7N  117.6W 2.5-4.3 AAAAA  California/Nevada area     

 

HIGH LATITUDE SEISMICITY CONTINUES WITH GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR FEBRUARY 19, 2020

 

A series of earthquakes  occurred at high latitudes today. These included an M 4.5 in the Arctic Ocean near Svalbard; an M 5.1 in the South Sandwich Islands of the South Atlantic and an M 5.0 in the Bouvet Island region of the South Atlantic. The occurrence of these events at this time may be related to the strong geomagnetic storm at high latitudes which continued today and was reported on in this summary in the previous issue as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field also saw minor storm conditions  with AP at 36. Active conditions in the geomagnetic field are often accompanied by an upswing in global seismicity especially at high latitudes and near the geomagnetic equator." (February 18-29, 2020)

 

They follow an unusual M 5.5 in the Arctic Ocean yesterday which was the strongest in that region in the past 18 years as noted at the time:

 

"Today's event is the strongest within about 400 km of today's event in the Arctic Ocean since an M 5.4-5.6 on May 3, 2002, the only other such event in the are in the past 30 years." (February 18-19, 2020)

 

Today's event in the Bouvet Island region is the strongest since an M 5.6 on January 12, 2020 and an M 5.1-5.4 on November 17, 2019. It is antipodal to the recent activity in the central Andreanof Islands at 175 West longitude. This activity began with an M 6.4 on November 24, 2019 and has been followed by the most recent aftershock of M 5.0 on February 13, 2020. The Bouvet Island quake had been expected in forecast 122093 within about 150 km of today's epicenter to occur around February 21.

 

O: 20FEB2020 06:42:23  54.6S    5.5E mb=5.0  EMSC   BOUVET ISLAND REGION         

P: 21FEB2020 122093    55.0S    2.0E 4.0-5.3 AABAA  Atlantic-Indian Ridge      

 

The South Sandwich Islands saw seismic events of M 6.1 on February 8 and January 20 but both of these were about 250 km south of today's epicenter. The last such event with M>=5.1 in the area within about 150 km of this epicenter occurred on June 24, 2019 with M 5.5.  Forecast 122095 had expected today's earthquake within about 50 km was likely around February 20. This epicenter is near the antipode of the M 7.0 in the Kuril Islands of February 13, 2020.

 

O: 20FEB2020 04:01:45  57.6S   26.1W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 20FEB2020 122095    58.0S   26.0W 4.0-5.6 AAAAA  So. Sandwich Islands       

 

The last earthquakes in Svalbard of M>=4.4 occurred on December 18, 2019 (M 4.8) and January 23, 2020 about 100 km south of today's epicenter. Forecast 121832 had expected today's activity was likely around February 11.

 

O: 19FEB2020 09:38:23  77.5N    7.4E mb=4.5  EMSC   SVALBARD REGION               

P: 11FEB2020 121832    79.0N    7.0E 4.0-5.4 CBAAA  Arctic Ocean Region        

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 off the coast of Oregon. NEIC reported this earthquake was felt with intensity II-III along the coast of Oregon at Bandon, Coos Bay, Brookings, Eugene, Portland and Bend.

This follows a similar M 4.7 on February 8, 2020 about 150 km southeast of this and M 5.9 near this epicenter on September 5, 2019.  Forecast 122020 had expected today's event was likely within about 75 km of the epicenter around February 16. Other regional activity accompanied this event in the Vancouver and Queen Charlotte Island region of British Columbia with M 3.0 and 2.6.

 

O: 19FEB2020 21:38:06  43.7N  127.9W mb=4.5  EMSC   OFF COAST OF OREGON          

P: 16FEB2020 122020    44.1N  128.8W 3.0-4.3 BAAAA  Off Coast of Oregon        

 

An unusual earthquake of M 3.7-3.9 shook areas of central and northern France in Brittany today. NEIC reported maximum intensity IV in Landeda, Bretagne, France and II-III in Bretagne at Landemeau, Brest, Bohars, Plouzane and Saint-Pabu. This is the strongest earthquake in the Brittany area within about 100 km of this epicenter since an M 3.9 on April 28, 2016 about 50 km northwest of today's epicenter. No events of M>3.9 have occurred in the area in the past 30 years.

Forecast 122044 had expected today's event was likely around February 21.

 

O: 19FEB2020 21:20:56  48.4N    4.2W ML=3.7  EMSC   FRANCE                       

P: 21FEB2020 122044    51.0N    3.0W 3.0-4.4 ACAAA  United Kingdom             

 

Another unusual earthquake occurred today near the coast of Libya. This event  is the strongest within about 200 km of this epicenter since an M 4.8 on February 9, 2012. No other activity within about 100 km of today's epicenter has been recorded at this magnitude level in the past 30 years. Forecast 121961 had expected it within this region was likely around February 15.

 

O: 19FEB2020 08:19:01  32.8N   23.0E mb=4.6  EMSC   NEAR COAST OF LIBYA           

P: 15FEB2020 121961    34.0N   24.0E 3.0-4.3 BBAAA  Crete                      

 

An unusual quake also shook areas of western Texas today. NEIC reported intensity IV in Texas at Gardendale, Midland and Odessa and II-III in Andrews, Texas. Today's event is the first of M>=3.3 in western Texas within about 100 km of this epicenter in more than 30 years. Prior activity about 200 km northeast of this occurred between 2008 and 2019 and may have been related oil mining in the area.  Other activity recently in western Texas has concentrated to the west near 103.5 and 104.5 West longitude.

 

O: 19FEB2020 20:54:44  32.0N  102.3W mb=3.3  EMSC   WESTERN TEXAS                

 

GEOMAGNETIC STORM COINCIDES WITH HIGH LATITUDE SEISMICITY

 

EARTHQUAKE SUMMARY FOR FEBRUARY 18, 2020

 

The strongest earthquake in the world today was an M 5.4 in the Arctic Ocean north of Svalbard. It was not reported felt in this remote area. It occurred as a strong geomagnetic storm was beginning at high latitudes as described in this summary:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field also saw minor storm conditions  with AP at 36. Active conditions in the geomagnetic field are often accompanied by an upswing in global seismicity especially at high latitudes and near the geomagnetic equator." (February 18-29, 2020)

 

Today's event is the strongest within about 400 km of today's event in the Arctic Ocean since an M 5.4-5.6 on May 3, 2002, the only other such event in the area in the past 30 years. Forecasts 121832 abnd 122056 had expected regional seismicity in mid-February. This epicenter is at the fifth node (72 degrees) from the M 7.7 south of Cuba of January 28 and may have promoted by energy from that source.

 

O: 18FEB2020 07:29:38  85.8N   22.9E mb=5.4  EMSC   NORTH OF SVALBARD            

P: 11FEB2020 121832    79.0N    7.0E 4.0-5.4 ACAAA  Arctic Ocean Region        

P: 21FEB2020 122056    74.0N   14.0E 3.0-4.6 BCAAA  Arctic Ocean Region        

 

A moderate earthquake of M 4.6 shook regions of eastern China in Shandong.

This is the strongest earthquake within about 250 km of this epicenter  since events of M 4.6 on February 12, 2018 and January 23, 2013. The last earthquake in the region of significantly larger magnitude was an M 5.1 on September 20, 1995 and M 5.0 on January 28, 1991. Forecast 121990 had expected in this area of China was likely around February 18.

 

O: 18FEB2020 09:07:23  36.5N  116.9E mb=4.6  EMSC   SHANDONG, CHINA              

P: 18FEB2020 121990    39.0N  116.0E 3.5-4.8 ACAAA  So. China                  

 

A pair of moderate earthquakes of M 4.3 and 4.8 also shook the area of western Turkey south of Istanbul.  NEIC reported this earthquake of M 4.8 in Western Turkey  was felt with intensity II-III in the area(s) of Western Turkey in Balikesir (IV) and Izmir, Foca, Bursa, Mudanya, Istanbul. The last earthquake of M>=4.8 within about 250 km of this epicenter was an M 4.9 on February 4. These appear to be aftershocks of an M 5.6 on January 22, 2020 and continue regional activation which began in late 2019. Forecast 121994 had expected today's event within about 150 km of this epicenter was likely around February 18.

 

O: 18FEB2020 16:45:18  39.1N   27.8E ML=3.9  EMSC   WESTERN TURKEY               

O: 18FEB2020 17:20:24  39.1N   27.8E ML=3.9  EMSC   WESTERN TURKEY               

O: 18FEB2020 21:23:09  39.1N   27.8E ML=4.3  EMSC   WESTERN TURKEY               

O: 18FEB2020 16:09:23  39.1N   27.8E mb=4.8  EMSC   WESTERN TURKEY               

P: 18FEB2020 121994    38.0N   29.0E 3.5-4.8 ABAAA  Turkey                     

 

MODERATE EARTHQUAKE IN BONIN ISLANDS, JAPAN

 

EARTHQUAKE SUMMARY FOR FEBRUARY 17, 2020

 

A moderate earthquake of M 5.4 occurred today south of Honshu in the Bonin Islands, Japan. It was not reported felt in this remote area. This area can generate large earthquakes but has been relatively quiet in recent years. The last event within about 200 km of today's epicenter was an M 5.4 on December 25, 2018. The last event of larger magnitude in the area was an M 5.7 on December 21, 2017. The current lull in regional seismicity may be due to stress release with the M 7.8 south of this on May 30, 2015. Forecast 121934 had expected today's activity in the Bonin Islands around February 20.

 

O: 17FEB2020 12:54:53  28.6N  142.7E Mw=5.4  EMSC   BONIN ISLANDS, JAPAN REGION  

P: 20FEB2020 121934    27.0N  140.0E 4.0-5.3 BBBAA  Bonin Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 4.7-4.9 in the Alaska Peninsula. NEIC reported it was felt with intensity III in Kodiak, Alaska. The last earthquake within about 150 km of this epicenter with M>=4.9 was an M 5.2 more than a year ago on January 22, 2019 and before that an M 5.3 on May 11, 2018. Forecast 122029 had expected today's event within about 100 km of this epicenter was likely around February 15.

 

O: 17FEB2020 09:18:04  57.5N  156.0W mb=4.9  EMSC   ALASKA PENINSULA             

P: 15FEB2020 122029    56.8N  156.7W 3.5-4.8 AAAAA  Alaska Peninsula           

 

MODERATELY STRONG QUAKE SHAKES SOUTHERN IRAN

 

EARTHQUAKE SUMMARY FOR FEBRUARY 16, 2020

 

The strongest earthquake in the world today was an M 5.5 in southern Iran. NEIC reported it was felt with maximum intensity IV in Iran at Gheshm and Bandar Abbas. It was also felt with intensity II-IV in the United Arab Emerates at Umm, Ras Al Khaimah, Ujman, Ash-Shariqah, Khawi, Dubai. An M 4.6 foreshock preceded it by about 6 minutes. This is the strongest earthquake in southern Iran within about 200 km of this epicenter since a similar M 5.5 about 150 km north of this on January 22, 2016 but the last of significantly larger magnitude in the area was an M 6.1 on May 1, 2013. Forecast 121944 had expected today's earthquake was likely in this area around February 18. This epicenter is at the fifth node (72 degrees) from the M 7.0 in the Kuril Islands of February 13 and may have been promoted by energy from this source. Other moderate quakes at the fifth node from the Kuril Islands included a moderate M 4.8 in eastern Turkey and several events including an M 3.3 in Baja California.

 

O: 16FEB2020 12:30:47  27.1N   55.8E Mw=5.2  EMSC   SOUTHERN IRAN                

O: 16FEB2020 12:30:47  27.1N   55.7E Mw=5.5  ANSS   SOUTHERN IRAN                

O: 16FEB2020 12:24:52  27.1N   55.8E mb=4.6  EMSC   SOUTHERN IRAN                

P: 18FEB2020 121944    28.0N   55.0E 3.5-4.9 AAAAA  So. Iran/Persian Gulf      

 

Moderately strong earthquakes of M 5.4 and 5.5 also occurred today in the northern Kuril Islands an in the Kermadec Islands of New Zealand. The M 5.4 in the Kuril Islands follows an M 7.0 in the southern Kuril Islands of February 13 and is the strongest in the northern Kuril Islands since an M 6.5 and aftershocks on October 9-11, 2018. Forecast 122013 had expected today's event in the region was likely around February 18.

 

O: 16FEB2020 07:35:37  49.4N  155.5E mb=5.4  EMSC   KURIL ISLANDS                

P: 18FEB2020 122013    48.0N  155.0E 3.5-5.4 ABAAA  NE Pacific                 

 

The earthquake of M 5.5 south of the Kermadec Islands, New Zealand was not reported felt in this remote area. The last earthquake of M>=5.5 within about 200 km of this epicenter occurred on July 23, 2019 with M 5.5. Forecast 122084 had expected today's event was likely about 100 km north of this epicenter around February 14.

 

O: 17FEB2020 00:28:12  33.1S  180.0W Mw=5.5  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 14FEB2020 122084    32.0S  180.0W 4.0-5.4 BBAAA  So. Kermadec Islands       

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in the western Andreanof Islands. It was not reported felt in this remote area. It is part of an activation of the region in late January which saw events in the region of M 6.1 and 6.2. It is the strongest event in the western Andreanof Islands since an M 5.4 on January 28, 2020. Forecast 122031 had expected today's activity was likely around February 15.

 

O: 17FEB2020 03:33:14  51.2N  178.2W Mw=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 15FEB2020 122031    51.1N  180.0W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

 

MODERATELY STRONG QUAKE SHAKES TAIWAN

 

EARTHQUAKE SUMMARY FOR FEBRUARY 15, 2020

 

A moderately strong M 5.2-5.7 earthquake was widely felt in Taiwan today. NEIC reported maximum intensity IV in Yunlin and II-III in Hualien, Nantou, Ilan, Taichung, Hsinchu, and Taipei. Aftershock of M 5.1 and M 5.2 were reported by NEIC to have been felt with intensity II-III in Taichung, Changhua and Taipei, Taiwan. CWB reported these earthquakes were felt with maximum intensity in Hualien (IV); III in Nantou, Taichung, Yilan, Taoyuan, Changhua, Yunlin, Miaoli; II in Taitung, Chiayi, Hsinchu, Taipei and I in Pingtung and Penghu and Kaohsiung Counties, Taiwan. This follows a series of moderate earthquake in Taiwan which occurred on February 13. This epicenter is located at the 12th node (30 degrees) from the M 7.0 in the Kuril Islands two days ago and may have been promoted by energy from that source. The last earthquake in Taiwan of M>=5.7 was an M 5.9 on August 7, 2019 and prior to that an M 6.1 on April 18, 2019. Forecast 121946 had expected today's activity was likely within about 50 km of this epicenter around February 16.

 

O: 15FEB2020 19:16:33  23.8N  121.5E ML=4.0  EMSC   TAIWAN

O: 15FEB2020 11:00:05  23.8N  121.6E Mw=5.2  EMSC   TAIWAN

O: 15FEB2020 11:00:06  23.8N  121.5E Mw=5.7  ANSS   TAIWAN

O: 15FEB2020 19:20:13  23.8N  121.6E mb=4.8  EMSC   TAIWAN

O: 15FEB2020 11:05:00  23.8N  121.6E mb=5.1  EMSC   TAIWAN                       

O: 15FEB2020 11:00:06  23.8N  121.5E ML=5.5  TAI    Hualien, Taiwan              

O: 15FEB2020 11:05:00  23.8N  121.5E ML=5.1  TAI    Hualien, Taiwan              

O: 15FEB2020 19:16:33  23.8N  121.5E ML=4.0  TAI    Hualien, Taiwan              

O: 15FEB2020 19:20:14  23.8N  121.5E ML=4.9  TAI    Hualien, Taiwan              

P: 16FEB2020 121946    24.0N  122.0E 4.0-5.3 AAAAA  Taiwan                     

 

When the foreshocks occurred on February 13, this summary noted them as follows:

 

 

O: 13FEB2020 07:44:06  22.7N  120.7E ML=4.0  TAI    Hualien, Taiwan              

O: 13FEB2020 07:44:06  22.7N  120.7E ML=4.0  EMSC   TAIWAN                       

P: 11FEB2020 121713    21.0N  120.0E 4.0-5.3 ABAAA  Taiwan                     

P: 15FEB2020 121945    21.0N  120.0E 4.0-5.3 ABAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity III in Pingtung; II in Kaohsiung and I in Tainan, Chiayi Counties, Taiwan.

 

O: 13FEB2020 17:49:18  24.2N  122.2E mb=4.7  EMSC   TAIWAN REGION                

O: 13FEB2020 17:49:19  24.3N  122.1E ML=4.8  TAI    Hualien, Taiwan               

P: 16FEB2020 121946    24.0N  122.0E 4.0-5.3 BAAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity II in Yilan, Hualien and Taipei and I in Taoyuan, Taipei, Taichung, Hsinchu, Miaoli, Nantou, Chiayi, Changhua, Yunlin and Taitung Counties, Taiwan.

 

O: 13FEB2020 20:25:06  23.7N  121.7E ML=4.0  TAI    Hualien, Taiwan              

P: 16FEB2020 121946    24.0N  122.0E 4.0-5.3 BAAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity II in Hualien and I in Taitung, Nantou, Yunlin and Changhua Counties, Taiwan.

 

O: 13FEB2020 21:38:42  22.4N  121.4E ML=4.6  TAI    Hualien, Taiwan              

O: 13FEB2020 21:38:40  22.4N  121.4E Mw=4.6  EMSC   TAIWAN REGION                

P:  7FEB2020 121714    23.0N  122.0E 4.0-5.3 AAAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity III in Taitung and I in Pingtung, Hualien and Kaohsiung Counties, Taiwan. NEIC reported this earthquake of M 4.6 in Taiwan  was felt with intensity II-III in the area(s) of Tainan, Taiwan.

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in Southern Alaska. NEIC reported it was felt with maximum intensity IV  on the Matanuska-Sustina Border and II-III in Talkeetna, Cantwell, Willow, Wasilla, Chugiak, Fort Richardson, Eagle River and Anchorage, Alaska. This is the largest earthquake within about 100 km of this epicenter in Central Alaska since an M 4.6 on October 27, 2019 and prior to that an M 5.0 on July 10, 2018. Forecast 122049 had expected today's activity in this region was likely around February 19.

 

O: 15FEB2020 07:17:21  62.8N  149.6W Mw=4.3  EMSC   CENTRAL ALASKA               

P: 19FEB2020 122049    63.1N  151.9W 3.2-4.8 BAAAA  Central Alaska             

 

Moderate earthquakes of M 5.4-5.6 were also recorded today in central Indonesia in the Seram area and in the Molucca area. These are aftershock of recent large earthquakes in these areas. The Seram event follows an M 5.6 on February 8 while the event in Molucca was probably and aftershock of the M 7.1 of November 14, 2019. This activity had been expected in forecasts 121884 and 121893 to occur around February 15-16. These events are located at 145-146 degrees from the M 7.7 south of Cuba of January 28 and may have been promoted by energy from that source.

 

O: 15FEB2020 15:36:41   1.6N  126.5E Mw=5.4  EMSC   MOLUCCA SEA                  

O: 15FEB2020 17:46:58   1.6N  126.6E ML=4.5  EMSC   MOLUCCA SEA                  

P: 15FEB2020 121884     1.0N  127.0E 4.0-5.5 AAAAA  Halmahera                  

 

O: 15FEB2020 23:00:26   3.4S  131.5E Mw=5.6  EMSC   CERAM SEA, INDONESIA         

P: 16FEB2020 121893     3.0S  129.0E 4.0-5.3 AACAA  Ceram  Island area         

 

 

 

 

 

CANADA SHAKES IN EAST AND WEST

 

EARTHQUAKE SUMMARY FOR FEBRUARY 14, 2020

 

The largest earthquake in the U.S. or Canada today was an M 4.6-4.7 in the Queen Charlotte Islands region, British Columbia, Canada. It was reported by NEIC to have been felt with intensity III in Walnut Cove, British Columbia and possibly at Point Roberts, Washington. The last earthquake of M>=4.7 in the area of Queen Charlotte Islands within about 250 km of this epicenter occurred on December 23 and 25, 2019 with maximum sized events of M 6.0, 6.0 and 6.3.  Forecast 122032 had expected this activity was likely in mid-February. This activity is located at the seventh node (51 degrees) from both of the last major earthquakes in the world - the M 7.7 south of Cuba on January 28 and the M 7.0 in the Kuril Islands, February 13. Constructive interference of seismic energy from these two sources may have helped promoted today's activity.

 

O: 14FEB2020 11:17:05  51.6N  130.9W MB=4.5  ECAN OF VILLAGE OF QUEEN CHARLOTTE, 

O: 14FEB2020 11:17:00  51.3N  131.4W MB=4.7  ECAN Village of Queen Charlotte, BC 

O: 14FEB2020 11:17:05  51.5N  130.9W Mw=4.6  EMSC   QUEEN CHARLOTTE ISLANDS REGION

P: 13FEB2020 122032    50.3N  130.2W 3.0-5.0 ABAAA  British Colombia           

 

Two light earthquakes of M 3.5 and 3.7 also occurred northwest of the M 4.7 in the Queen Charlotte Island region today. Forecasts 121809 and 122032 had expected this activity in early to mid-February.

 

O: 14FEB2020 09:56:58  52.7N  132.3W MB=3.5  ECAN Village of Queen Charlotte, BC 

O: 14FEB2020 06:32:19  53.7N  132.8W MB=3.7  ECAN Port Clements, BC   

O: 14FEB2020 09:56:58  52.7N  132.3W ML=3.5  EMSC   QUEEN CHARLOTTE ISLANDS REGION

P:  6FEB2020 121809    52.0N  132.0W 3.0-4.9 CAAAA  British Colombia           

P: 18FEB2020 122032    54.0N  134.0W 3.0-4.9 BBAAA  British Colombia           

 

 

A pair of light earthquakes also occurred on he opposite side of North America in the region of Labrador and Nunavit, Canada with M 3.2 and 3.8 respectively. They were not reported felt. The event of M 3.2 in Labrador may be an aftershock of an M 4.3 that hit the region on February 3.

 

O: 14FEB2020 13:14:36  54.9N   59.5W MB=3.2  ECAN Labrador, Canada      

O: 14FEB2020 13:14:36  54.9N   59.5W ML=3.2  EMSC   LABRADOR, NFLD. AND LAB., CANA

 

The earthquake in Nunavit, Canada of M 3.8 was located near Dundas Harbour.

It is the largest event within about 300 km of this epicenter since an M 4.0

on March 24, 1991, the only such event of M>=3.8 in the area in the past 30 years.

 

O: 14FEB2020 09:11:10  74.4N   82.0W MB=3.8  ECAN Dundas Harbour, NU   

O: 14FEB2020 09:11:10  74.4N   82.1W ML=3.8  EMSC   DEVON ISLAND, NUNAVUT, CANADA

 

The strongest earthquakes in the world today was an M 5.1 in the region of Xinjiang, China and in the South Sandwich Islands.  They were not reported felt in these remote areas and is part of a series of moderate earthquakes in the area over the past two weeks which has included events of M 6.1 on February 8 and January 20, 2020. Forecast 122095 had expected today's activity within about 150 km of the epicenter was likely in mid-February.

 

An M 6.0 hit southern Xinjiang, China about 200 km southwest of today's epicenter on January 19, 2020 but the last within about 150 km of today's event with M>=5.1 was an M 5.1 on December 5, 2019 and October 27, 2019. The last of larger magnitude in this area was an M 6.1 on January 28, 2013.  Forecast 122008 had expected today's event within about 50 km was likely around

February 15.

 

O: 14FEB2020 09:55:24  59.0S   25.5W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 12FEB2020 122095    60.0S   29.0W 4.0-5.5 AABAA  So. Sandwich Islands       

P: 20FEB2020 122095    58.0S   26.0W 4.0-5.6 CAAAA  So. Sandwich Islands       

 

O: 15FEB2020 03:32:00  41.8N   79.3E mb=5.1  EMSC   SOUTHERN XINJIANG, CHINA     

P: 15FEB2020 122008    42.0N   79.0E 4.0-5.4 AAAAA  Kirgizstan/Xinjiang        

 

MAJOR KURIL ISLANDS QUAKE AT 102-103 DEGREES FROM CUBA

 

EARTHQUAKE SUMMARY FOR FEBRUARY 13, 2020

 

A major earthquake of M 6.9-7.0 shook regions of the Kuril Islands today. NEIC reported maximum intensity V in Hokkaido and IV in Sakhalin, Russia. Intensity II-IV was reported from areas of Hokkaido within about 500 km of the epicenter.

This epicenter is at 102-103 degrees from the M 7.7 south of Cuba on January 28, and the first major quake in the world since that time. Seismic energy from large earthquakes concentrates at the surface around 102-103 degrees from the mainshock epicenter after reflection and refraction off inner earth boundaries. Strongly enhanced seismicity in this distance range is common following major earthquakes. At the time of the event in the Cuba region of January 28, this summary had noted the potential for a strong quake in Hokkaido and northern Japan and the Kurils as:

 

"The earthquake near Cuba may reset global seismicity as it is the strongest

in nearly a year in the world. Far-field triggering is most likely in eastern

Turkey, Iran/Iraq and the east African Rift valley as well as in Hokkaido and northern Japan (103 degrees)" (January 28-29, 2020)

 

and in the previous issue:

 

"Seismicity around the world continued at quiet levels today. It appears that it is increasing however. The dampening effect of the full moon alignment often disappears around 4 days after the full moon and a moderate to strong earthquake is possible in the next day or two.

 

As in the past several days, the largest earthquakes in the world today were of

M 5.0-5.3 and occurred in Vanuatu and Fiji, northern Chile and in Japan." (February 12-13, 2020)

 

Today's event of M 7.0 in the Kuril Islands is the strongest quake recorded in the Southern Kuril Islands in near seven years - since an M 7.2 on April 19, 2013 and prior to that an M 7.3 on November 17, 2002. After the M 7.7 in Cuba region of January 28, it is the strongest earthquake in the world during 2020. Forecast 122024 had expected today's event was likely in mid-February within about 50 km of this epicenter.

 

O: 13FEB2020 10:33:44  45.7N  148.7E Mw=6.9  EMSC   KURIL ISLANDS                

O: 13FEB2020 10:33:44  45.6N  148.9E Mw=7.0  ANSS   KURIL ISLANDS                

P: 18FEB2020 122024    45.0N  149.0E 3.5-5.4 BAAAA  So. Kurils                 

 

An earthquake of M 5.5 also occurred in the South Pacific today on the Pacific-Antarctic Ridge. It was not reported felt in this remote area. Recent earthquakes of M>=5.5 in the region occurred as an M 5.5 on October 9, 2019 and M 5.9 on May 1, 2018.

 

O: 14FEB2020 05:59:00  56.6S  142.3W Mw=5.5  EMSC   PACIFIC-ANTARCTIC RIDGE      

 

The strongest earthquakes in the U.S. or Canada today continued in the Aleutian Islands with an M 5.0 in the Central Andreanof Islands and an M 4.9 in the Rat Islands. These were not reported felt in these remote areas. Forecast 121815 and 121807 had expected this activity was likely in early February.

 

O: 13FEB2020 14:07:39  51.6N  177.3E mb=4.9  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  8FEB2020 121815    51.0N  178.0E 4.0-5.5 BAAAA  Rat Islands                

 

O: 13FEB2020 15:26:25  51.2N  175.0W mb=5.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 13FEB2020 15:38:46  51.3N  175.0W ml=3.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 13FEB2020 15:30:49  51.3N  175.1W ml=3.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 13FEB2020 15:29:39  51.1N  174.9W mb=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6FEB2020 121807    50.3N  176.2W 3.5-4.8 CAAAA  Andreanoff Isls, Aleutians 

 

QUIET SEISMIC PATTERN ABOUT TO CHANGE?

 

EARTHQUAKE SUMMARY FOR FEBRUARY 12, 2020

 

Seismicity around the world continued at quiet levels today. It appears that it is increasing however. The dampening effect of the full moon alignment often disappears around 4 days after the full moon and a moderate to strong earthquake is possible in the next day or two.

 

As in the past several days, the largest earthquakes in the world today were of

M 5.0-5.3 and occurred in Vanuatu and Fiji, northern Chile and in Japan. As the earth becomes more active these areas are likely to lead the way. The strongest activity in Japan today occurred off the east coast of Honshu (M 5.2) and in the area of Hokkaido (M 4.4). Forecast 122005 had expected the Hokkaido event was likely within about 150 km around February 15. This epicenter is at the fifth node (72 degrees) from the M 6.8 in Eastern Turkey of January 24 and may have been promoted by energy from that source. It is also near 103 degrees from the M 7.7 in Cuba of January 28. The 103 degree distance in this area passes through the southern Kuril Islands, an active area which may see additional strong promotion from Cuba. The earthquake off eastern Honshu was the strongest within about 100 km of that epicenter since an M 5.2-5.3 on February 6, 2020 and an M 5.2 on December 11, 2019. The last event of larger magnitude in this area was an M 6.3 on August 4, 2019.  Forecast 121976 had expected this activity in Japan was likely in mid-February.

 

NEIC reported the earthquake of M 5.2 in Honshu, Japan  was felt with intensity II-III in the area(s) of Honshu, Japan in Fukusima and Miyagi (V); Tochigi, Ibaraki, and Chiba.

 

O: 12FEB2020 10:37:19  37.3N  141.3E Mw=5.2  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 14FEB2020 121976    36.0N  142.0E 4.0-5.3 ABAAA  Off East Coast Honshu      

P: 19FEB2020 121976    38.0N  142.0E 4.0-5.4 CAAAA  Off East Coast Honshu      

 

O: 12FEB2020 10:36:30  42.7N  142.0E ML=4.4  EMSC   HOKKAIDO, JAPAN REGION       

P: 15FEB2020 122005    44.0N  142.0E 3.5-5.3 BBAAA  Hokkaido, Japan            

 

An earthquake of M 5.0-5.2 also shook the region of northern Chile near Tarapaca today. GUC reported this earthquake was felt with intensity  III in  Arica and Parinacota at Arica, Chile. NEIC reported these earthquakes of M 5.0 and 4.4 in Northern Chile were felt with intensity II-III in the area(s) of Northern Chile at Iquique, Tarapaca. Forecast 121857 had expected this activity was likely around February 11.

 

O: 13FEB2020 05:50:38  21.0S   70.8W Mw=5.0  EMSC   OFFSHORE TARAPACA, CHILE     

O: 13FEB2020 06:36:28  21.0S   71.0W mb=4.4  EMSC   OFFSHORE TARAPACA, CHILE     

O: 13FEB2020 05:50     20.9S   70.9W mb=5.2  GUC    Arica and Parinacota at Arica,

P: 11FEB2020 121857    20.0S   69.0W 4.0-5.3 AABAA  So. Peru/Bolivia           

 

An earthquake in southern Vanuatu of M 5.1 was not reported felt today. It may have been promoted stresses from Tropical Cyclone Uesi which is currently located west of this epicenter. This storm had been expected to enhance seismicity in Vanuatu as noted in previous issues of this summary:

 

"Tropical cyclone Uesi (15P) continued southwest  of Vanuatu today with winds up to 90 kts.  It is likely it could help enhance seismicity in the region of Vanuatu and the Loyalty Islands while it is in the area." (February 11-12, 2020)

 

Forecast 121847 had expected this activity was likely in early February within about 100 km of this epicenter.

 

O: 13FEB2020 06:50:46  19.3S  168.8E mb=5.1  EMSC   VANUATU                      

P:  5FEB2020 121847    19.0S  168.0E 4.0-5.4 CAAAA  Vanuatu Islands            

 

The strongest earthquakes in the U.S. or Canada today continued to occur in the Andreanof Islands of the Aleutians (M 4.6) and in the Alaska Peninsula.  NEIC reported the earthquake of M 4.4 in the Alaska Peninsula  was felt with intensity II-III in the area(s) of the Alaska Peninsula at Kodiak. The M 4.7 in the Alaska Peninsula is near antipodal to activity south of Africa over the past several days. This summary had noted in this regard in previous issues:

 

 

"At high southern latitudes which have seen earthquakes of M 5.5 and 6.2 in the

Drake Passage and South Sandwich Islands in the past two days, an M 5.1 was located south of Africa. The last events in the area within about 400 km of this epicenter occurred on January 10, 2020 (M 5.4) and August 22, 2018 (M 5.6). The antipode of this epicenter is located in the region of the Alaska Peninsula at 53N 153W - an area of limited seismicity. Little effect on the seismicity of that region is expected." (February 11, 2020)

 

O: 13FEB2020 06:53:30  51.3N  175.1W mb=4.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6FEB2020 121807    50.3N  176.2W 3.5-4.8 CAAAA  Andreanoff Isls, Aleutians 

 

O: 12FEB2020 14:16:03  58.8N  154.5W mb=4.7  EMSC   ALASKA PENINSULA              

P: 18FEB2020 122046    60.2N  153.2W 3.2-4.8 CBAAA  Central Alaska             

 

An unusually strong M 3.7-4.0 quake occurred in Central California south of San Francisco today. NEIC reported this earthquake of M 3.7 in Central California  was felt with intensity II-III in the area(s) of Central California at Hollister (IV), Gonzales, San Juan Bautista, Salinaas, Soledad, Paicines and Castroville.

The last earthquake of M>=4 within about 50 km of today's epicenter was an  M 4.7 on October 15, 2019 and prior to that an M 4.1 on November 2, 2018 and an M 4.6 on November 13, 2017. Forecast 121954 had expected today's events within about 10 km of the epicenter likely around February 12. This epicenter is at 103 degrees from the M 6.8 in Eastern Turkey of January 24 and may have been promoted by energy from that source.

 

O: 13FEB2020 03:36:10  36.7N  121.3W MD=2.0  EMSC   CENTRAL CALIFORNIA

O: 13FEB2020 06:26:53  36.7N  121.3W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 13FEB2020 03:33:42  36.7N  121.3W Mw=4.0  EMSC   CENTRAL CALIFORNIA

O: 12FEB2020 18:58:33  36.6N  121.2W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P: 12FEB2020 121954    36.8N  121.3W 2.5-4.4 AAAAA  Central California         

 

QUIET GLOBAL SEISMICITY CONTINUES; UNUSUAL QUAKE NEAR SRI LANKA

 

EARTHQUAKE SUMMARY FOR FEBRUARY 11, 2020

 

As it has for the past four days, global seismicity remained at quiet levels today. The strongest earthquakes were of M 5.3 and M 5.4. These events in the area south of Fiji (M 5.4) and in the Mariana Islands (M 5.3) and northern Chile (M 5.3) were unremarkable and not felt in these regions. Forecasts 122077 and 121695 had expected this activity around February 11-15.

 

O: 11FEB2020 11:07:02  25.2S  180.0E Mw=5.4  EMSC   SOUTH OF FIJI ISLANDS        

P: 15FEB2020 122077    23.0S  179.0E 4.0-5.3 BCAAA  Tonga/Fiji                 

 

O: 11FEB2020 10:37:01  15.8N  147.9E mb=5.3  EMSC   MARIANA ISLANDS REGION       

P: 11FEB2020 121695    16.0N  145.0E 4.0-5.3 AACAA  No. Marianas               

 

An M 5.3 in northern Chile was felt in that region. GUC reported this earthquake was felt with intensity  IV in  Atacama at Chanaral; III in Copiapo, Diego de Almagro and Tierra Amarilla and in Antofagasta with III in Antofagasta and Taltal, Chile. NEIC reported this earthquake of M 5.2 in Northern Chile  was felt with intensity II-III in the area(s) of Northern Chile at Taltal, Antofagasta and Copiapo, Atacama. This is an active area but the last earthquake of M>=5.3 within about 250 km of this epicenter occurred nearly a year ago with an M 5.4 on March 28, 2019. Forecast 121851 had expected today's event was likely around February 11.

 

O: 11FEB2020 13:50     24.8S   70.8W mb=5.3  GUC    Atacama at Chanaral; III in Co

P: 11FEB2020 121851    24.0S   69.0W 4.0-5.3 AABAA  Coast No. Chile            

 

An unusual earthquake of M 4.7 also occurred near Sri Lanka today. NEIC reported this earthquake of M 4.7 in Sri Lanka  was felt with intensity II-III in the area(s) of Sri Lanka at Matara, Weligama, Galla, Nuiwara Eliya, Kotte, Colombo and Kelaniya Gampaha. The only earthquake of M>=4.7 in this area within about 300 km in the past 30 years was an M 5.2 on July 18, 2007. An earthquake of M 4.5 hit west of this in the Maldive Islands on February 5 and was also very unusual. It is possible that a regional stress helped trigger both of these events south  of India. When the Maldive Islands quake occurred this summary noted:

 

"An unusual M 4.5 occurred in the Maldive Islands today. NEIC reported it was felt with intensity II in the Maldives at Kulhudhuffushi, Haa, Feydhoo, Goidhoo, Firubaidhoo. The Maldive Islands, located south of India, lie at an elevation near sea level. As such, they are greatly impacted by changes in sea level compared to Island surface. They were inundated, for example, during the December 26, 2004 Indian Ocean-wide tsunami. Subsidence-related seismicity in the area could be a major problem for this island nation. This epicenter is at 142 degrees from the M 7.7 south of Cuba of January 28, a  distance at which seismic energy concentrates at the surface of the earth and may have been promoted by energy from that event. It is the largest earthquake in the region of the Maldive Islands within about 250 km in  at least 30 years." (February 6, 2020)

 

O: 11FEB2020 21:04:20   4.6N   83.5E mb=4.7  EMSC   NORTH INDIAN OCEAN           

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the Near Islands, Aleutians at the westernmost edge of those islands. This is a remote area and this earthquake was not reported felt in the region. The last earthquakes in the Near Islands of M>=4.9 occurred on January 1, 2020 (M 5.1) and October 26, 2019 (M 5.4) and prior to that in August, 2017. The last earthquake in the area of M>=5.4 was an M 6.8 north of today's epicenter on June 2, 2017.  Forecast 122040 had expected today's event was likely around February 13.

 

O: 12FEB2020 00:43:22  52.7N  171.9E mb=4.9  EMSC   NEAR ISLANDS, ALEUTIAN ISLANDS

P: 13FEB2020 122040    52.0N  174.0E 4.0-5.6 AABAA  Rat Islands                

 

Other seismicity at high latitudes today occurred south of Africa (M 5.0) and in the South Sandwich Islands (M 4.9). These events were not reported felt in these remote areas. The event in the South Sandwich Islands is an aftershock of an M 6.2 three days ago. The earthquake South of Africa is at the antipode of the Fox Islands (52N 163W) where some antipodal activity may occur in the next several days. This activity at high latitudes continues the trend associated with a geomagnetic storm four days ago.

 

O: 11FEB2020 13:07:28  52.3S   17.0E mb=5.0  EMSC   SOUTHWEST OF AFRICA          

 

O: 11FEB2020 07:39:57  60.4S   25.7W mb=4.9  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  6FEB2020 121877    60.0S   26.0W 4.0-5.5 BAAAA  So. Sandwich Islands       

 

QUIET CONDITIONS CONTINUE IN GLOBAL SEISMICITY

 

EARTHQUAKE SUMMARY FOR FEBRUARY 10, 2020

 

It was a quiet day in global seismicity. No earthquakes were recorded with M>5.0. The strongest earthquake of the day was an aftershock in the South Sandwich Islands of M 5.0. This follows an M 6.1 mainshock of February 8. Other moderate quakes of M 4.8-4.9 also occurred in the Andaman Islands, India; the Dodecanese Islands, Greece and off eastern Honshu, Japan.

 

O: 10FEB2020 19:52:09  60.4S   25.7W ML=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  6FEB2020 121877    60.0S   26.0W 4.0-5.5 BAAAA  So. Sandwich Islands       

 

O: 10FEB2020 18:20:10  13.1N   93.3E mb=4.9  EMSC   ANDAMAN ISLANDS, INDIA REGION

P:  9FEB2020 121679    11.0N   95.0E 4.0-5.3 ACBAA  Andaman Islands            

 

O: 10FEB2020 22:46:55  35.1N   28.0E mb=4.8  EMSC   DODECANESE ISLANDS, GREECE   

P: 10FEB2020 121765    36.0N   28.0E 3.5-5.1 AAAAA  Turkey                     

 

O: 10FEB2020 10:11:04  36.4N  144.1E mb=4.8  EMSC   OFF EAST COAST OF HONSHU, JAPA

P: 11FEB2020 121743    36.0N  142.0E 4.0-5.3 AABAA  Off East Coast Honshu      

 

The lull in global seismicity over the past several days is probably related to the supermoon full moon of January 9. During a full moon the sun and moon are on opposite sides of the earth and the tidal effects from each is approximately cancelled out. This results in little tidal triggering and often in a period of quiet seismicity in the earth. This summary noted this possibility in the tidal triggering forecast for this full moon as:

 

"The full moon arrived on February 9, 2020 at 07:33 UT. Longitudes which were at local solar midnight at this time (sub-lunar) are near 115 West longitude while those which are sub-solar at the time of the full moon are near 65 East longitude. These include the western U.S. and Canada including Baja California, California, Nevada and the Pacific Northwest in the west and central Asia - Hindu Kush, Pakistan and Iran in the east. While tidal stresses are highest in these regions, and most likely to promote seismicity, enhanced seismicity is not expected world-wide in the next week. This is a supermoon when the moon is nearest the earth and tidal stresses are greatest. Other super moons will occur on March 9 as well as in early April and early May. Global seismicity is likely to be reduced  during this period when tidal stresses from the sun an moon are approximately cancelled." (January 10, 2020)

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Alaska Peninsula. It was not reported felt in this remote area. The last earthquake of M>=4.2 within about 150 km of this epicenter was an M 4.6 on November 19, 2019. Forecast 121818 had expected today's activity to the southwest around February 8. This may be related to the M 5.5 south of Africa which occurred yesterday and had been noted in this summary as:

 

 

"At high southern latitudes which have seen earthquakes of M 5.5 and 6.2 in the

Drake Passage and South Sandwich Islands in the past two days, an M 5.1 was located south of Africa. The last events in the area within about 400 km of this epicenter occurred on January 10, 2020 (M 5.4) and August 22, 2018 (M 5.6).

The antipode of this epicenter is located in the region of the Alaska Peninsula at 53N 153W - an area of limited seismicity. Little effect on the seismicity of that region is expected." (January 9-10, 2020)

 

O: 10FEB2020 20:37:20  55.4N  157.1W mb=4.2  EMSC   ALASKA PENINSULA             

P:  8FEB2020 121818    54.2N  162.5W 3.5-5.0 ABCAA  Unimak Islands, Aleutians  

 

An unusual earthquake of M 2.3 in the Channel Islands region of southern California occurred today. The last such earthquake within about 50 km of this epicenter occurred as an M 2.5 on November 18, 2019. Forecast 121753 had expected activity in this area around February 10. Earthquakes in this area occasionally precede stronger activity nearer Los Angeles to the north.

 

O: 11FEB2020 06:26:19  33.6N  119.0W Ml=2.3  EMSC   CHANNEL ISLANDS REG., CALIFORN

P: 10FEB2020 121753    34.0N  118.7W 2.5-4.3 AAAAA  So. California             

 

HIGH LATITUDE SEISMICITY ENHANCEMENT CONTINUES

 

EARTHQUAKE SUMMARY FOR FEBRUARY 9, 2020

 

The enhancement of seismicity at high latitudes and near the geomagnetic equator continued for the third straight day today. In the north an M 5.0 was located in the Arctic Ocean north of Svalbard. It was not reported felt in this remote area. This is an active area at magnitudes of M 5.0-5.2 with five events of this magnitude in the past 10 years. The largest event in the past 20 years was an M 6.4-6.5 on March 6, 2009.

 

O:  9FEB2020 13:32:52  81.2N    4.0W mb=5.0  EMSC   NORTH OF SVALBARD            

 

At high southern latitudes which have seen earthquakes of M 5.5 and 6.2 in the

Drake Passage and South Sandwich Islands in the past two days, an M 5.1 was located south of Africa. The last events in the area within about 400 km of this epicenter occurred on January 10, 2020 (M 5.4) and August 22, 2018 (M 5.6). The antipode of this epicenter is located in the region of the Alaska Peninsula at 53N 153W - an area of limited seismicity. Little effect on the seismicity of that region is expected. A major earthquake did occur northeast of this in the Gulf of Alaska on January 23, 2018 (M 7.9) and aftershocks in the area may be enhanced in coming days. An M 5.1 aftershock shook the area of the Gulf of Alaska on January 31, 2020 - the largest in more than a year.

 

 

O:  9FEB2020 07:05:40  52.8S   27.5E mb=5.1  EMSC   SOUTH OF AFRICA              

 

Moderate to strong seismicity also continued near the geomagnetic equator today.

An M 5.4 was located in the Bismarck Sea of Indonesia. This general region has seen large earthquake in Java and New Britain in early February. Earthquakes in the Bismarck Sea in the past year of M>=5.4 occurred on December 3 (M 5.6); July 15 (M 6.2) and May 15, 2019 (M 5.5). Forecast 121666 had expected today's activity in early February.

 

O:  9FEB2020 09:42:25   4.6S  149.4E Mw=5.4  EMSC   BISMARCK SEA                 

P:  4FEB2020 121666     4.0S  152.0E 4.0-5.3 BACAA  New Britain                

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 near Watson Lake, Yukon Territory, Canada. It was reported lightly felt in the epicentral area east of the Alaskan border. The only events of M>=4.5 within about 200 km of this epicenter in the past 30 years were an M 4.9 on August 11, 2001 and M 5.0 on May 12, 1999. Forecast 121831 had expected today's event was likely to the north around February 9.

 

O:  9FEB2020 23:12:10  60.7N  129.6W Mw=4.1  EMSC   SOUTHERN YUKON TERRITORY, CANA

O:  9FEB2020 23:12:12  60.7N  129.6W MB=4.5  ECAN of Watson Lake, YT             

P:  9FEB2020 121831    63.0N  130.0W 2.5-3.9 ACAAA  Yukon Territory, Canada    

 

There were no moderate earthquakes of M>=3 in Hawaii today, but the region was by no means quiet. A series of events of M>=2 were recorded. Hawaii lies at 120 degrees (node 3) and at 72 degrees from the M 6.8 in eastern Turkey of January 24 and (node 5) from the M 7.7 south of Cuba of January 28 and became active shortly after those events. This activity may precede another volcanic activity on the island. Forecast 121707 had expected this activity in early February.

 

O:  9FEB2020 07:15:07  19.2N  155.4W Md=2.2  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7FEB2020 121707    19.3N  155.6W 4.0-5.3 AAAAA  Hawaii area                

 

GEOMAGNETIC STORM CONTINUES TO EXCITE LOW AND HIGH LATITUDE SEISMICITY

 

EARTHQUAKE SUMMARY FOR FEBRUARY 8, 2020

 

The geomagnetic storm of the past two days, the strongest in a month continued to be associated with high latitude earthquakes and with earthquakes near the geomagnetic equator. These included an M 6.1 in the South Sandwich Islands of the South Atlantic and an M 6.2 in New Britain, PNG. This summary had expected this activity in the previous summary as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 15.  High latitude geomagnetic field also saw active conditions  with AP at 18. This continues the strongest geomagnetic disturbance in the past month - since AP reached 12 on January 9. Seismicity at high latitudes and about 10 degrees from the geomagnetic equator will likely be enhanced over the next four days." (February 7-8, 2020)

 

The strongest earthquake in the world today was an M 6.2 near the geomagnetic equator in New Britain, PNG. NEIC reported it was felt with maximum intensity IV in Kokopo and Kinbe and III in Rabaul, East New Britain. An M 7.5 occurred in the New Britain area about 200 km northeast of today's epicenter on May 14, 2019 but the last of equal or stronger magnitude within about 150 km was an M 6.2 on October 10, 2018. Forecast 121666 had expected today's event was likely within this area around February 4-5.

 

O:  9FEB2020 06:04:32   5.5S  152.1E Mw=6.2  EMSC   NEW BRITAIN REGION, P.N.G.   

P:  4FEB2020 121666     4.0S  152.0E 4.0-5.3 BBAAA  New Britain                

P:  5FEB2020 121666     5.0S  154.0E 4.0-5.3 BABAA  New Britain                

 

An M 6.1 also occurred today in the South Sandwich Islands region of the South Atlantic. It was not reported felt in this remote area. An M 6.1 also hit about 150 km northwest of this epicenter on January 20, 2020 but the last within about 200 km of today's event in the southern South Sandwich Islands occurred as an M 6.6 on August 27, 2019. Today's event may be an aftershock of that. Today's earthquake was accompanied by aftershocks of M 4.8, 4.8 and 5.1. It occurred near local solar noon and may have also been promoted by strong tidal stresses associated with the super-full moon of February 9 as noted in previous issues of this summary:

 

"The full moon arrived on February 9, 2020 at 07:33 UT. Longitudes which were at local solar midnight at this time (sub-lunar) are near 115 West longitude while those which are sub-solar at the time of the full moon are near 65 East longitude. These include the western U.S. and Canada including Baja California, California, Nevada and the Pacific Northwest in the west and central Asia - Hindu Kush, Pakistan and Iran in the east. While tidal stresses are highest in these regions, and most likely to promote seismicity, enhanced seismicity is expected world-wide in the next week. This is a supermoon when the moon is nearest the earth and tidal stresses are greatest. Other super moons will occur on March 9 as well as in early April and early May. Global seismicity is likely to be enhanced during this period." (February 6-8, 2020)

 

Forecast 121877 had expected today's event within about 25 km of the epicenter was likely around February 6. It occurred at the fourth node (90 degrees) from the M 7.7 earthquake of January 28 south of Cuba and was probably promoted fromo that source.

 

O: 08FEB2020 16:16:55  59.9S   25.7W mb=4.8  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 08FEB2020 16:06:17  60.3S   24.7W mb=4.8  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 08FEB2020 18:25:58  60.5S   24.5W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

O:  8FEB2020 14:32:58  59.8S   25.8W Mw=6.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  6FEB2020 121877    60.0S   26.0W 4.0-5.5 AAAAA  So. Sandwich Islands       

 

A moderate earthquake of M 4.7 occurred today off the coast of Oregon. NEIC reported it may have been felt with intensity II in Reedsport and Clatskanie, Oregon. The last earthquake within about 150 km of this epicenter off the coast of Oregon with M>=4.7 was an M 4.7 on October 17, 2019. A series of moderate events beginning with M 5.4 on June 22, 2019 occurred at the activation of the area in June to July, 2019. Forecast 121794 had expected today's event in this region was likely around February 11.

 

O:  8FEB2020 15:34:56  43.4N  126.9W mb=4.7  EMSC   OFF COAST OF OREGON          

P: 11FEB2020 121794    42.1N  126.9W 3.0-4.4 BBAAA  Off Coast of Oregon        

 

The largest earthquake in the U.S. or Canada today was an M 3.9-4.0 in southern California near Barstow. NEIC reported maximum intensity IV at Newberry Springs and II-III in Barstow, Daggett, Hinkley, Fort Irwin, Helendale, Apple Valley, Lucerne Valley, Boron and Victorville. NEIC reported the aftershock of M 2.6 in Southern California  was felt with intensity IV in the area(s) of Southern California at Barstow.  This appears to be an aftershock of the M 4.6 near Barstow of January 25, 2020. A similar M 4.0 occurred a year ago to the southeast of this on February 7, 2019. In the previous issue of this summary it had been noted that a moderate event in  southern California was possible at this time as:

 

"Some seismicity in the western U.S. has been associated with the M 7.7 in

Cuba of January 28. Unusual moderate events in the Mammoth Lakes area and

other areas of California suggest some triggering at this time. The region of

Southern California is at the 7th node (51 degrees) from Cuba and could

be a site of an upcoming moderate event." (February 6-7, 2020)

 

Forecast 121757 had expected today's event within about 10 km was likely in early February. This epicenter is at 103 degrees from the M 6.8 in Turkey of January 24 and may have been promoted by energy from that event.

 

O:  9FEB2020 02:51:42  35.1N  117.0W ML=2.5  EMSC   SOUTHERN CALIFORNIA          

O:  8FEB2020 19:34:19  35.1N  117.0W Mw=3.9  EMSC   SOUTHERN CALIFORNIA          

O:  8FEB2020 19:34:19  35.1N  117.0W Mw=4.0  ANSS   SOUTHERN CALIFORNIA          

P:  3FEB2020 121757    35.1N  117.0W 2.5-4.3 BAAAA  So. California             

 

SEISMICITY UP AT HIGH; LOW LATITUDES WITH GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR FEBRUARY 7, 2020

 

 

The strongest earthquake in the world today was an M 5.5 in the Drake Passage south of South America. This is the strongest earthquake in this remote area within about 400 km of this epicenter since an M 5.6 on August 27, 2018 and prior to that an M 6.6 and 5.6 on January 15 and 17, 2012. This may have been promoted by the current geomagnetic storm which, as noted, in the previous issue of this summary could have enhanced seismicity in the region of high latitudes as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 15.  High latitude geomagnetic field also saw active conditions  with AP at 20. This is the strongest geomagnetic disturbance in the past month - since AP reached 12 on January 9. Seismicity at high latitudes and about 10 degrees from the geomagnetic equator will likely be enhanced over the next four days." (February 6-7, 2020)

 

This epicenter is 106 degrees from the M 7.1 in Southern California of July 6, 2019 and may have been disturbed by energy from that source.

 

O:  7FEB2020 18:52:51  59.4S   60.1W Mw=5.5  EMSC   DRAKE PASSAGE                

 

The strongest earthquake ever observed in the in the Drake Passage or South Shetland Islands occurred 49 years ago on February 8, 1971 and was followed within a day by the San Fernando Valley earthquake of M 6.7 in Southern California. It was felt in the Argentine Islands. Crevasses were formed in the Argentine Islands.

 

Other moderate seismicity at high latitudes occurred in the Macquarie Island region south of New Zealand with M 5.0.

 

O:  7FEB2020 08:20:14  50.1S  161.9E mb=5.0  EMSC   NORTH OF MACQUARIE ISLAND    

 

An earthquake of M 5.5 was also felt in the area of Seram, Indonesia today.

It was accompanied by a series of moderate aftershocks. An earthquake of M 6.5 hit west of this on September 25, 2019 and today's events may be regional aftershocks of that event. Forecast 121678 had expected activity in the region around February 11.

 

O: 07FEB2020 14:53:34   2.3S  138.4E ML=4.3  EMSC   PAPUA, INDONESIA

O: 08FEB2020 06:56:45   2.8S  130.0E ML=4.4  EMSC   SERAM, INDONESIA

O: 08FEB2020 06:36:46   3.0S  129.9E Mw=5.5  EMSC   SERAM, INDONESIA

O:  8FEB2020 06:51:40   3.0S  129.9E mb=4.9  EMSC   SERAM, INDONESIA             

P: 11FEB2020 121678     6.0S  130.0E 4.0-5.3 BCAAA  West Irian, PNG            

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in the Fox Islands, Alaska. It was not reported felt in this remote area. The last earthquake in the Fox Islands of equal or larger magnitude within about 150 km of this epicenter was an M 4.0 on January 18, 2020. Forecasts 121808 and 121811 had expected today's activity within this area around February 11.

 

O:  7FEB2020 18:30:16  51.6N  171.1W ml=3.8  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  6FEB2020 121811    51.9N  169.2W 3.5-4.8 AABAA  Fox Islands, Aleutians     

P: 11FEB2020 121808    52.3N  170.1W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

 

An unusual earthquake of M 3.0 shook the area of northern Kansas and Southern Nebraska today. NEIC reported this earthquake of M 3.0 in Northern Kansas  was felt with intensity II-III in the area(s) of Northern Kansas at Burr Oak and Mankato and in Nebraska at Red Cloud and Beatrice. This is the strongest event in the area within about 100 km of this epicenter since a series of M 3.5-3.7 events in early April and early June, 2017. Note that the area of Oklahoma and Kansas often sees enhanced seismicity at times of full and new moons and may see a moderate quake in the next several days. Forecast 121764 had expected regional seismicity around February 4.

 

This epicenter is on the edge of Nebraska which often sees enhanced seismicity prior to moderate events along the western edge of the North American tectonic plate. Other factors also suggest a moderate upcoming event in this region – including the strong nor'easter which has just concluded in the northeast U.S. and a similar earthquake north of this epicenter earlier in January. Some seismicity in the western U.S. has been associated with the M 7.7 in Cuba of January 28. Unusual moderate events in the Mammoth Lakes area and other areas of California suggest some triggering at this time. The region of Southern California is at the 7th node (51 degrees) from Cuba and could be a site of an upcoming moderate event.

 

O:  8FEB2020 05:37:37  39.9N   98.3W mb=3.0  EMSC   KANSAS                       

P:  4FEB2020 121764    38.0N   99.0W 2.0-3.8 BBAAA  Southern Plains            

 

 

STRONG M 6.0 SHAKES MINDANAO, PHILIPPINES

 

EARTHQUAKE SUMMARY FOR FEBRUARY 6, 2020

 

The strongest earthquake in the world today was an M 6.0 in Mindanao, Philippines. NEIC reported this earthquake of M 6.0 in Mindanao, Philippines  was felt with intensity II-III in the area(s) of Mindanao, Philippines at Pundaguitan (VII) and Digos, Davao, Bato and San Isidro. It was preceded by an M 3.6 about two hours earlier to the southeast and followed by a series of moderate aftershocks. The Mindanao area has been active over the past several months with events of M>=6 on October 29 and 31 (M 6.6, 6.5) and December 15, 2019 (M 6.8) about 200 km to the northwest of today's epicenter. The last nearer to today's event occurred as an M 6.2 on September 29, 2019. Forecast 121656 had expected today's activity was likely around February 5.  Today's M 6.0 is located at 144 degrees from the M 7.7 in Cuba of January 28. This is a distance at which strong concentration of seismic energy occurs at the surface following major earthquakes and probably helped promote today's Mindanao event.

 

O: 06FEB2020 14:20:46   5.4N  126.4E mb=4.8  EMSC   MINDANAO, PHILIPPINES

O: 06FEB2020 13:45:38   5.4N  126.5E ML=4.6  EMSC   MINDANAO, PHILIPPINES

O: 06FEB2020 18:27:22   5.5N  126.4E mb=4.7  EMSC   MINDANAO, PHILIPPINES

O: 06FEB2020 13:40:05   5.5N  126.6E Mw=6.0  EMSC   MINDANAO, PHILIPPINES

O: 06FEB2020 11:47:59   6.5N  125.3E ML=3.6  EMSC   MINDANAO, PHILIPPINES

O:  7FEB2020 02:03:37   5.3N  126.4E mb=4.6  EMSC   MINDANAO, PHILIPPINES        

P:  5FEB2020 121656     6.0N  125.0E 4.0-5.3 AAAAA  Mindanao, Philippines      

 

The largest earthquake in the U.S. or Canada today was an M 4.4 in the Unimak Island area of the Alaska Peninsula, Alaska. It was note reported felt in this remote area. This is the strongest event in the Unimak area of Alaska within about 150 km of this epicenter since an M 4.4 on October 26, 2019. The area was also active during the activation of Alaska in early July, 2019 with events of  M 4.4 and 4.5. Forecast 121818 had expected today's event within about 25 km of the epicenter was likely around February 6.

 

O:  6FEB2020 08:24:29  54.5N  161.4W mb=4.4  EMSC   ALASKA PENINSULA             

P:  6FEB2020 121818    54.3N  161.4W 3.5-5.1 AAAAA  Unimak Islands, Aleutians  

 

The strongest earthquake in the U.S. or Canada outside Alaska today was an M 3.4-3.8 off the coast of northern California. NEIC reported it was felt with intensity II-III in Petrolia, Fortuna, Garberville, Piercy and Fort Bragg, California. NEIC reported the earthquake of M 2.5 offshore Northern California  was felt with intensity II-III in the area(s) of Northern California in Manchester, Elk and Point Arena. Recent activity in this area off the coast of Northern California at this magnitude level has included events of M 4.1 on December 19, 2019 and an M 3.4 on October 31, 2019. The last moderate event in the region occurred with the regional activation of late June and early July as an M 5.6 on June 23, 2019. Today's activity is probably aftershocks of that  event. Forecast 121793 had expected today's activity within about 50 km of these epicenters was likely around February 7. The mainshock occurred within minutes of local solar midnight and was probably enhanced by tidal stresses associated with the upcoming full moon as noted in previous issues of this summary:

 

 

"The full moon will arrive on February 9, 2020 at 07:33 UT. Longitudes which are at local solar midnight at this time (sub-lunar) are near 115 West longitude while those which are sub-solar at the time of the full moon are near 65 East longitude. These include the western U.S. and Canada including Baja California, California, Nevada and the Pacific Northwest in the west and central Asia - Hindu Kush, Pakistan and Iran in the east. While tidal stresses are highest in these regions, and most likely to promote seismicity, enhanced seismicity is expected world-wide in the next week. This is a supermoon when the moon is nearest the earth and tidal stresses are greatest. Other super moons will occur on March 9 as well as in early April and early May. Global seismicity is likely to be enhanced during this period." (February 5-6, 2020)

 

These events are at 100-103 degrees from Mindanao, the M 6.8 in Turkey of January 24, 2020  and the M 7.1 in Molucca of November 14, 2019 and were probably promoted by the recent strong events in those regions.

 

O: 07FEB2020 00:53:15  40.3N  124.4W ML=2.7  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 06FEB2020 11:21:08  40.3N  124.4W Md=2.1  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 06FEB2020 10:00:08  40.3N  124.4W Md=2.5  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 06FEB2020 11:05:29  40.3N  124.4W Ml=3.1  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 07FEB2020 01:17:06  40.4N  124.3W Md=2.2  EMSC   NORTHERN CALIFORNIA

O:  6FEB2020 08:20:19  40.2N  124.8W ML=3.4  EMSC   OFFSHORE NORTHERN CALIFORNIA 

O:  6FEB2020 08:20:24  40.3N  124.4W ML=3.8  ANSS   OFFSHORE NORTHERN CALIFORNIA 

P:  7FEB2020 121793    40.7N  124.6W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

Moderate activity in eastern Europe and northeast Africa today continued the activation of this area which began with the M 6.8 in Turkey of January 24. Moderate quakes today occurred in Crete (M 4.7, 4.4 and 4.1) and in Central Greece (M 5.1, 3.9, 4.2). An earthquake of M 5.7 about 150 km to the southeast of today's event occurred along with an M 5.5 and 5.6 on January 28-30, 2020. The last similar or larger event in Crete within about 150 km of today's epicenter occurred as an M 5.4 on December 10, 2019 and prior to that an M 6.0 on November 27, 2019. Forecast 121715 had expected today's activity was likely within about 100 km around February 7. Much of today's activity in eastern Europe continues at about 103 degrees from the Ridgecrest, California event of July 6, 2019 and by earthquakes in the Philippines and Molucca area of Indonesia. The area is also at the fourth node (90 degrees) from the M 7.7 in Cuba of January 28 and may have been promoted from that source.

 

O: 07FEB2020 03:11:47  34.9N   26.5E mb=4.7  EMSC   CRETE, GREECE

O: 07FEB2020 02:23:58  34.9N   26.6E mb=4.4  EMSC   CRETE, GREECE

O:  7FEB2020 02:16:02  35.0N   26.6E mb=4.1  EMSC   CRETE, GREECE                

P:  7FEB2020 121715    35.0N   25.0E 3.0-4.4 AAAAA  Aegean Sea                 

 

The M 5.1 in Greece follows an M 5.0 about 150 km southwest of that epicenter which occurred on January 19. Forecast 121799 had expected today's activity in the area around February 6.

 

NEIC reported this earthquake of M 5.2 in Greece  was felt with intensity II-III in the area(s) of Greece at Megala Kalivia, Ioannina and Volos.

 

O: 06FEB2020 18:06:53  38.1N   22.3E mb=4.2  EMSC   GREECE

O:  7FEB2020 04:45:37  38.1N   22.2E ML=3.9  EMSC   GREECE                       

O:  6FEB2020 09:24:14  39.2N   21.4E mb=5.1  EMSC   GREECE                        

P:  6FEB2020 121799    40.0N   25.0E 3.0-4.9 AACAA  Romania/NW Turkey          

 

The most unusual earthquake in the area today was an M 4.6 in the Red Sea. This follows an M 4.0 in the Dead Sea to the north yesterday. The last earthquake within about 200 km of this epicenter in the Red Sea of M>=4.6 occurred as an M 4.9 on September 11, 2019 and prior to that an M 4.6 on March 10, 2019. Forecasts 121685 and 121461 had expected this activity in this area in late January or early February.

 

O:  7FEB2020 04:48:37  17.7N   40.1E mb=4.6  EMSC   RED SEA                      

P:  7FEB2020 121685    13.0N   40.0E 3.5-4.9 ACAAA  Ethiopia                   

P: 31JAN2020 121461    19.0N   39.0E 3.0-4.8 CBAAA  Sudan                      

 

An M 4.6 was lightly felt in the Leeward Islands at Guadeloupe today. This is the largest earthquake in the Guadeloupe area within about 150 km of this epicenter since an M 4.8 on December 27, 2019 and an M 4.7 on July 25, 2019 and April 17, 2018. Forecast 121688 had expected this event within this area was likely around February 10. It may have been promoted by antipodal effects from  Tropical Cyclone Damien which passed over the antipode of this earthquake a day ago as noted in this summary:

 

"Tropical cyclone Damien (14S) continued off northwestern Australia today with winds of 80 kts.  It is near-antipodal to northern Caribbean and Puerto Rico and may have helped promote the activity in Puerto Rico today due to antipodal focusing effects. In the region, enhanced seismicity in Java to Sumbawa, Indonesia is likely in the next several days due to stresses from this storm." (February 5-6, 2020)

 

O:  6FEB2020 21:10:53  16.7N   61.0W mb=4.6  EMSC   GUADELOUPE REGION, LEEWARD ISL

P: 10FEB2020 121688    17.0N   60.0W 3.0-4.9 BAAAA  Leeward Islands            

 

UNUSUAL MALDIVE ISLANDS EARTHQUAKE COULD SPELL TROUBLE

 

EARTHQUAKE SUMMARY FOR FEBRUARY 5, 2020

 

An unusual M 4.5 occurred in the Maldive Islands today. NEIC reported it was felt with intensity II in the Maldives at Kulhudhuffushi, Haa, Feydhoo, Goidhoo, Firubaidhoo. The Maldive Islands, located south of India, lie at an elevation near sea level. As such, they are greatly impacted by changes in sea level compared to Island surface. They were inundated, for example, during the December 26, 2004 Indian Ocean-wide tsunami. Subsidence-related seismicity in the area could be a major problem for this island nation. This epicenter is at 142 degrees from the M 7.7 south of Cuba of January 28, a distance at which seismic energy concentrates at the surface of the earth and may have been promoted by energy from that event. It is the largest earthquake in the region of the Maldive Islands within about 250 km in  at least 30 years. An event of M 4.9 occurred about 400 km southeast of this on October 11, 2016 and an M 4.8 on January 27, 2001 was about 500 km southeast of this epicenter.

 

O:  5FEB2020 20:47:08   7.3N   73.7E mb=4.5  EMSC   MALDIVE ISLANDS REGION       

 

The strongest earthquake in the world today was an M 6.2 north of Java, Indonesia. NEIC reported it was felt with intensity II-III in Java at Lasem, Madiun, Semarang and in Bali at Tabanan, Ubud, Denpasar and Kuta Bali. This is the strongest earthquake north of Java within about 250 km of this epicenters since an M 6.2 on September 19, 2019 and priorf to that an M 6.3 on May 26, 2006. The strongest event in the area in the past 30 years was an M 6.7 on September 2, 1992. Forecast 121433 had expected today's event was possible to the southeast in early February. This epicenter is near the antipode of the M 7.7 in Cuba of January 28 and is the first strong earthquake in the world since that time. It may have been promoted by energy from that event. It is also near the position of Tropical Cyclone 14S which may also have promoted regional seismicity at this time as noted in this summary:

 

“Tropical cyclone 14S formed off northwestern Australia today with winds of 45 kts.  It is near-antipodal to northern Caribbean and Puerto Rico and may have helped promote the activity in Puerto Rico today due to antipodal focusing effects. Regional seismicity to the north in the area of Java to Sumbawa, Indonesia is also likely to be enhanced.” (February 5, 2020)

 

O:  5FEB2020 18:12:37   6.1S  113.1E Mw=6.2  EMSC   JAVA, INDONESIA              

O:  5FEB2020 18:34:39   6.7S  113.1E ML=4.2  EMSC   JAVA, INDONESIA              

P:  1FEB2020 121433     8.0S  117.0E 4.0-5.3 BBCAA  Sumbawa Island area        

 

A moderately large earthquake of M 5.8 also occurred south of New Zealand in the Macquarie Island region. This epicenter is antipodal to the Reykjanes Ridge in the north Atlantic where some antipodal-related seismicity is possible in the next several days. At M 5.8 this is the strongest event within about 400 km of this epicenter since a similar M 5.8 on March 1, 2019. The last such event of larger magnitude was an M 6.1 on September 8, 2016.

 

O:  5FEB2020 12:17:05  54.6S  158.8E Mw=5.8  EMSC   MACQUARIE ISLAND REGION      

 

The strongest earthquake in the U.S. or Canada today was an M 3.6 in the Andreanof Islands, Aleutians, Alaska. It was not reported felt. This continues recent activity in this area and is not unexpected. Forecast 121807 had expected this event within about 100 km around February 6.

 

O:  5FEB2020 23:35:08  51.2N  176.1W ml=3.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6FEB2020 121807    50.3N  176.2W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

 

The strongest earthquake in North America today was an M 5.1 in the Revilla Gigedo Islands of Mexico. It was not reported felt in this remote area. It is the strongest event within about 200 km of this epicenter since an M 5.8 on August 14, 2019 and prior to that an M 5.6 on November 27, 2018. The area had been quiet at this magnitude level from 2013 through 2018. Forecast 121684 had expected this event was likely within about 100 km of this epicenter around February 11. In the previous issue of this summary, it had been noted that this epicenter is near the antipode of Tropical Cyclone Francisco and could see antipodal promotion at this time as:

 

"A tropical cyclone may also be forming in the South Indian Ocean. This system is located at 16S 66E with winds up to 45 kts and moving to the south at 14 kts. The antipode is south of the Gulf of California where some sympathetic seismicity may be enhanced as this system is in the area. Later it will move to the south, perhaps affecting Baja and Southern California about the time of the full moon." (February 5, 2020)

 

O:  5FEB2020 10:43:06  19.9N  109.3W Mw=5.1  EMSC   REVILLA GIGEDO ISLANDS REGION

P: 11FEB2020 121684    19.0N  109.0W 3.5-5.1 CAAAA  Coast of Jalisco, Mexico   

 

MODERATE QUAKE SHAKES NORTH ISLAND, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR FEBRUARY 4, 2020

 

The strongest earthquake in the world today was an M 5.2-5.5 north of North Island, New Zealand. NEIC reported it was felt with maximum intensity IV in New Zealand at Waiouru and II-III in Tauranga, Bay of Plenty, Whangamata, Waikato, Gisborne, Napier, Hawke's Bay and Palmerston North, North Island. GEONET reported this earthquake was felt with light intensity in the area of northern North Island,  New Zealand. 11282 persons reported feeling this earthquake with 7560 light shaking; 3425 with light intensity; 276 with moderate intensity 12 with strong shaking; 0 with severe and 9 with extreme shaking in North Island, New Zealand. The last earthquake of larger magnitude in the region was an M 5.8 on November 23, 2019 which may have led to the deadly eruption on White Islands days later. Prior to that the most active period in the area had been in early September 2016.  Forecast 121865 had expected this area would be active in early February. This activity is located at 146 degrees from the M 6.8 in Turkey of January 24 and may have been promoted by energy from this source.

 

O:  4FEB2020 09:47:23  37.7S  176.5E mb=5.2  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 04FEB2020 09:47:26  37.6S  176.6E ML=5.5  GEONET Felt with light intensity

P:  7FEB2020 121865    39.0S  178.0E 3.0-4.4 BBAAA  North Island, N.Z.         

 

Moderate seismicity returned to southern Puerto Rico today. The strongest event in the aftershock zone of the M 6.5 of January 7, 2020 was an M 5.0-5.2. It was reported by NEIC to have been felt with maximum intensity IV in Puerto Rico at Penuelas, San Sebastian, Ciales, Hatillo and II-III in Yauco, Juana Diaz, Lares, Moca and Aguada and throughout most of Puerto Rico. Aftershocks, including an M 4.0 were felt with intensity II-III in Corozal, Puerto Rico. Following is a listing of events of M>=4.0 in the region of southern Puerto Rico that occurred today (M>=3 are listed in the "AMERICA" section below). Forecast 121699 had expected today's activity was likely around February 4.

 

O: 04FEB2020 19:53:15  17.8N   66.9W Mw=4.2  EMSC   PUERTO RICO REGION

O: 04FEB2020 17:29:26  17.8N   66.9W mb=4.4  EMSC   PUERTO RICO REGION

O: 04FEB2020 14:45:55  17.9N   66.8W mb=5.1  EMSC   PUERTO RICO REGION

O:  4FEB2020 15:12:10  17.7N   66.8W ML=4.0  EMSC   PUERTO RICO REGION           

P:  4FEB2020 121699    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

 

Earthquakes of M 4.6 and 4.9 occurred in western Turkey today, part of an aftershock sequence which has continued in the area for about a week. Today's activity was felt with intensity II-III in Turkey at Balikesir, Izmir, Bursa, Yakuplu, Istanbul, Corlu and in Orestias, Greece. The M 4.8 was preceded by an M 4.5 foreshock. This series began shortly before the M 6.8 in eastern Turkey on January 24 with an M 5.6 on  January 22 and may have been promoted be stress redistribution after that event. Forecast 121533 expected today's activity was likely in late January or early February. This activity is at the fourth node (90 degrees) from the M 7.7 south of Cuba  of January 28 and may have been promoted by energy from that source.

 

O: 04FEB2020 08:43:16  39.0N   27.9E ML=4.1  EMSC   WESTERN TURKEY

O: 04FEB2020 16:47:09  39.0N   27.9E ML=4.5  EMSC   WESTERN TURKEY

O:  4FEB2020 17:55:23  39.0N   27.8E mb=4.8  EMSC   WESTERN TURKEY               

P: 29JAN2020 121533    39.0N   28.0E 3.5-4.8 BAAAA  Turkey                     

 

The strongest earthquake in the U.S. or Canada today was an M 5.3 in the Rat Islands, Aleutians, Alaska. It was not reported felt in this region. This extends the current activity in the Andreanof Islands to the west. It is the strongest earthquake in the Rat Islands since an M 5.3 on April 14, 2019 - an aftershock of an M 6.4 on April 2, 2019. Forecast 121815 had expected today's event within about 100 km of this epicenter was likely in early February.

 

O:  4FEB2020 22:17:45  51.9N  178.5E mb=5.3  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  8FEB2020 121815    51.0N  178.0E 4.0-5.5 BAAAA  Rat Islands                

 

A light swarm of minor earthquakes occurred in Southern California today. 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 Lake Elsinore and in Yuma, Arizona. This activity was expected in forecast 121749 within about 25 km of these epicenter was likely around February 5. This activity is located at 104 degrees from the M 6.8 in Turkey of January 24 and may have been promoted by energy from this source.

 

O: 04FEB2020 13:15:47  33.2N  115.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 04FEB2020 11:59:54  33.2N  115.6W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 04FEB2020 12:03:22  33.2N  115.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 04FEB2020 13:06:41  33.2N  115.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O:  4FEB2020 13:03:32  33.2N  115.6W ML=2.8  EMSC   SOUTHERN CALIFORNIA          

P:  5FEB2020 121749    32.9N  115.6W 2.5-4.3 AAAAA  So. California             

 

Seismicity in the region of Taal Volcano near Manila, Philippines resumed today.

This may lead to another eruptive episode at that volcano. Forecast 121448 had expected this activity at the end of January or in early February.

 

O:  4FEB2020 20:37:00  13.5N  120.9E ML=3.6  EMSC   MINDORO, PHILIPPINES         

O:  4FEB2020 13:56:12  14.3N  120.4E ML=3.5  EMSC   LUZON, PHILIPPINES           

P: 28JAN2020 121448    14.0N  120.0E 3.5-4.8 CAAAA  Luzon, Philippines         

 

VOLCANIC AREAS AT NODAL DISTANCES FROM CUBA CONTINUE ACTIVE

 

EARTHQUAKE SUMMARY FOR FEBRUARY 2, 2020

 

Areas of the world with high heat flow and at nodal distances from the M 7.7 south of Cuba of January 28, 2020 continued to display enhanced seismicity today. These include areas of New Guinea (144 degrees, node 5); Volcano Islands (120 degrees, node 3); Iceland (60 degrees, node 6), Mammoth Lakes, California (40 degrees node 9), Nevada (36 degrees node 10), southern Alaska and Hawaii (72 degrees, node 5). Enhanced motions of the earth's surface at these distances (360/n, where n is a small integer) may be bringing on this seismicity.

 

An M 4.2 in Hawaii today continued the enhancement of seismicity in the area which began after the M 7.7 south of Cuba of January 28, 2020. NEIC reported today's event was felt throughout Hawaii with intensity II-III in Hawaii National Park, Volcano, Pahoa, Mountain View, Kurtistown, Pahala, Keaau, Hilo, Papaikou and Pepeekeo, Hawaii. This follows an M 3.8 on January 29, 2020.  The last such event of M>=4.2 in the region occurred on November 11, 2019 with M 4.9. When the M 3.8 occurred on January 29, this summary noted:

 

"An M 3.8 in the Leilani Estates region of Hawaii today was widely felt. NEIC reported IV at Pahoa and II-III at Mountain View, Kurtistown, Volcano, Keaau, Hawaii National Park,  Hilo, Papaikou, Pepeeleo and Hakalau, Hawaii. This is the area where a strong eruption occurred in the summer of 2018 which stopped short on August 9, 2018. The only earthquake in the area of stronger magnitude since then was an M 5.5 on March 13, 2019 about 25 km west of today's epicenter. Forecast 121467 had expected today's event was likely within about 25 km of this epicenter around January 27. This epicenter is located at the fifth node (72 degrees) from the M 7.7 in Cuba of January 28 and was probably promoted from that source. If this is the case further seismicity and perhaps volcanism may follow in Hawaii.' (January 30, 2020)

 

O:  3FEB2020 06:37:10  19.3N  155.2W Ml=4.2  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JAN2020 121467    19.3N  155.3W 4.0-5.3 CAAAA  Hawaii area                

 

An M 4.4 also occurred near Redoubt Volcano, Alaska today. NEIC reported intensity II-III in Kasilof, Clam Gulch, Soldotna, Sterling, Kenai, Homer, and Anchorage, Alaska. The last earthquake within about 100 km of this epicenter was an M 4.8 on March 7, 2019 and February 1, 2019. Forecast 121590 had expected today's event at the end of January.

 

O:  2FEB2020 14:57:52  58.2N  156.0W mb=4.4  EMSC   ALASKA PENINSULA             

P: 24JAN2020 121590    60.0N  153.5W 3.2-4.9 CBBAA  Central Alaska             

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 south of Anchorage, Alaska. This is the strongest earthquake within about 100 km of this epicenter since the activation of early July, 2019 when quakes of M 4.6 and 4.7 occurred. Forecast 121591 had expected this activity was possibly around February 1.

 

O:  3FEB2020 04:49:07  60.6N  152.4W mb=4.6  EMSC   SOUTHERN ALASKA               

P: 24JAN2020 121590    60.0N  153.5W 3.2-4.9 CAAAA  Central Alaska             

P:  1FEB2020 121591    60.1N  150.6W 3.2-4.9 AAAAA  Central Alaska             

 

O:  2FEB2020 09:00:00  63.9N   22.4W ML=3.3  EMSC   ICELAND REGION               

 

An unusual earthquake of M 4.0 also shook the region of Southern Quebec, Canada today. This is the strongest earthquake within about 100 km of this epicenter since an M 4.1 October 1, 2007 and an M 4.5 on October 12, 2003. Forecast 121563 had expected a possible event southwest of this epicenter in late January.

 

O:  2FEB2020 20:05:32  47.5N   78.6W ML=4.0  EMSC   SOUTHERN QUEBEC, CANADA      

P: 25JAN2020 121563    46.0N   81.0W 2.0-3.8 CBBAA  Ohio/Lake Erie             

 

A pair of earthquakes of M 3.6 and M 3.7 in Nevada today were the strongest in California or Nevada.  NEIC reported these earthquakes of M 3.6 and 3.7 in Nevada  was felt with intensity II-III in the area(s) of Nevada at Pioche and Overton. The M 3.7 was felt with intensity VI in Caliente, Nevada and III in Pioche and Baker, Nevada.  These events area at the 10th node (36 degrees) from Cuba and are in the basin and range province of Nevada where heat flow is high. They were probably promoted by energy from the M 7.7 in Cuba of January 28.

Forecast 121499 had expected today's events about 50 km southwest of this epicenter was likely in early February.

 

O: 02FEB2020 19:50:54  37.8N  114.3W ML=2.6  EMSC   NEVADA

O: 02FEB2020 17:39:09  37.8N  114.3W ML=3.6  EMSC   NEVADA

O:  2FEB2020 17:34:29  37.8N  114.3W ML=3.7  EMSC   NEVADA                       

P:  1FEB2020 121499    37.3N  114.9W 2.5-4.3 AAAAA  Nevada area                

 

Seismicity also continued at enhances levels north of Puerto Rico and in southern Puerto Rico. The northern zone is now showing more seismicity than the southern zone and is not part of the aftershock sequence of the January 7, 2020 event of M 6.5. It is on the western boundary of the Puerto Rico Trench. A strong earthquake is overdue and potentially dangerous in the Puerto Rico Trench and may have been promoted by stress transfer from the M 6.5. Forecasts 121459 and 121458 had expected this activity in late January or early February.

 

O: 02FEB2020 09:15:51  19.0N   67.5W ML=3.4  EMSC   PUERTO RICO REGION

O: 02FEB2020 19:37:43  19.3N   66.0W ML=3.5  EMSC   PUERTO RICO REGION

O:  2FEB2020 22:29:41  18.7N   69.8W ML=3.4  EMSC   DOMINICAN REPUBLIC           

P: 31JAN2020 121459    19.0N   71.0W 3.4-4.8 AAAAA  Puerto Rico                

 

O: 03FEB2020 00:33:18  17.9N   66.7W ML=4.2  EMSC   PUERTO RICO REGION

O: 03FEB2020 05:02:12  17.9N   66.8W ML=4.0  EMSC   PUERTO RICO REGION

P: 29JAN2020 121458    18.0N   66.0W 3.4-4.9 BAAAA  Puerto Rico                

 

VOLCANIC AREAS AT NODAL DISTANCES FROM CUBA CONTINUE ACTIVE

 

EARTHQUAKE SUMMARY FOR FEBRUARY 2, 2020

 

Areas of the world with high heat flow and at nodal distances from the M 7.7 south of Cuba of January 28, 2020 continued to display enhanced seismicity today. These include areas of New Guinea (144 degrees, node 5); Volcano Islands (120 degrees, node 3); Iceland (60 degrees, node 6), Mammoth Lakes, California (40 degrees node 9), Nevada (36 degrees node 10), southern Alaska and Hawaii (72 degrees, node 5). Enhanced motions of the earth's surface at these distances (360/n, where n is a small integer) may be bringing on this seismicity.

 

An M 4.2 in Hawaii today continued the enhancement of seismicity in the area which began after the M 7.7 south of Cuba of January 28, 2020. NEIC reported today's event was felt throughout Hawaii with intensity II-III in Hawaii National Park, Volcano, Pahoa, Mountain View, Kurtistown, Pahala, Keaau, Hilo, Papaikou and Pepeekeo, Hawaii. This follows an M 3.8 on January 29, 2020.  The last such event of M>=4.2 in the region occurred on November 11, 2019 with M 4.9. When the M 3.8 occurred on January 29, this summary noted:

 

"An M 3.8 in the Leilani Estates region of Hawaii today was widely felt. NEIC reported IV at Pahoa and II-III at Mountain View, Kurtistown, Volcano, Keaau, Hawaii National Park,  Hilo, Papaikou, Pepeeleo and Hakalau, Hawaii. This is the area where a strong eruption occurred in the summer of 2018 which stopped short on August 9, 2018. The only earthquake in the area of stronger magnitude since then was an M 5.5 on March 13, 2019 about 25 km west of today's epicenter. Forecast 121467 had expected today's event was likely within about 25 km of this epicenter around January 27. This epicenter is located at the fifth node (72 degrees) from the M 7.7 in Cuba of January 28 and was probably promoted from that source. If this is the case further seismicity and perhaps volcanism may follow in Hawaii.' (January 30, 2020)

 

O:  3FEB2020 06:37:10  19.3N  155.2W Ml=4.2  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JAN2020 121467    19.3N  155.3W 4.0-5.3 CAAAA  Hawaii area                

 

An M 4.4 also occurred near Redoubt Volcano, Alaska today. NEIC reported intensity II-III in Kasilof, Clam Gulch, Soldotna, Sterling, Kenai, Homer, and Anchorage, Alaska. The last earthquake within about 100 km of this epicenter was an M 4.8 on March 7, 2019 and February 1, 2019. Forecast 121590 had expected today's event at the end of January.

 

O:  2FEB2020 14:57:52  58.2N  156.0W mb=4.4  EMSC   ALASKA PENINSULA             

P: 24JAN2020 121590    60.0N  153.5W 3.2-4.9 CBBAA  Central Alaska             

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 south of Anchorage, Alaska. This is the strongest earthquake within about 100 km of this epicenter since the activation of early July, 2019 when quakes of M 4.6 and 4.7 occurred. Forecast 121591 had expected this activity was possibly around February 1.

 

O:  3FEB2020 04:49:07  60.6N  152.4W mb=4.6  EMSC   SOUTHERN ALASKA              

P: 24JAN2020 121590    60.0N  153.5W 3.2-4.9 CAAAA  Central Alaska             

P:  1FEB2020 121591    60.1N  150.6W 3.2-4.9 AAAAA  Central Alaska             

 

O:  2FEB2020 09:00:00  63.9N   22.4W ML=3.3  EMSC   ICELAND REGION               

 

An unusual earthquake of M 4.0 also shook the region of Southern Quebec, Canada today. This is the strongest earthquake within about 100 km of this epicenter since an M 4.1 October 1, 2007 and an M 4.5 on October 12, 2003. Forecast 121563 had expected a possible event southwest of this epicenter in late January.

 

O:  2FEB2020 20:05:32  47.5N   78.6W ML=4.0  EMSC   SOUTHERN QUEBEC, CANADA      

P: 25JAN2020 121563    46.0N   81.0W 2.0-3.8 CBBAA  Ohio/Lake Erie              

 

A pair of earthquakes of M 3.6 and M 3.7 in Nevada today were the strongest in California or Nevada.  NEIC reported these earthquakes of M 3.6 and 3.7 in Nevada  was felt with intensity II-III in the area(s) of Nevada at Pioche and Overton. The M 3.7 was felt with intensity VI in Caliente, Nevada and III in Pioche and Baker, Nevada.  These events area at the 10th node (36 degrees) from Cuba and are in the basin and range province of Nevada where heat flow is high. They were probably promoted by energy from the M 7.7 in Cuba of January 28.

Forecast 121499 had expected today's events about 50 km southwest of this epicenter was likely in early February.

 

O: 02FEB2020 19:50:54  37.8N  114.3W ML=2.6  EMSC   NEVADA

O: 02FEB2020 17:39:09  37.8N  114.3W ML=3.6  EMSC   NEVADA

O:  2FEB2020 17:34:29  37.8N  114.3W ML=3.7  EMSC   NEVADA                       

P:  1FEB2020 121499    37.3N  114.9W 2.5-4.3 AAAAA  Nevada area                

 

Seismicity also continued at enhances levels north of Puerto Rico and in southern Puerto Rico. The northern zone is now showing more seismicity than the southern zone and is not part of the aftershock sequence of the January 7, 2020 event of M 6.5. It is on the western boundary of the Puerto Rico Trench. A strong earthquake is overdue and potentially dangerous in the Puerto Rico Trench and may have been promoted by stress transfer from the M 6.5. Forecasts 121459 and 121458 had expected this activity in late January or early February.

 

O: 02FEB2020 09:15:51  19.0N   67.5W ML=3.4  EMSC   PUERTO RICO REGION

O: 02FEB2020 19:37:43  19.3N   66.0W ML=3.5  EMSC   PUERTO RICO REGION

O:  2FEB2020 22:29:41  18.7N   69.8W ML=3.4  EMSC   DOMINICAN REPUBLIC           

P: 31JAN2020 121459    19.0N   71.0W 3.4-4.8 AAAAA  Puerto Rico                

 

O: 03FEB2020 00:33:18  17.9N   66.7W ML=4.2  EMSC   PUERTO RICO REGION

O: 03FEB2020 05:02:12  17.9N   66.8W ML=4.0  EMSC   PUERTO RICO REGION

P: 29JAN2020 121458    18.0N   66.0W 3.4-4.9 BAAAA  Puerto Rico                 

 

TODAY IN EARTHQUAKE HISTORY

 

GLOBAL:

 

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

 

MO DA HR MN SC YEAR  LATIT   LONGIT  DEP MW  LOCATION

 

 2  2 15  0  0 1605  33.050  138.050   0 7.9   Central/So. Honshu Japan

 

Also given date as Jan. 31. 700 houses - 41% of the town of Hiro was destroyed. A strong tsunami was generated which washed away Hito and drowned 3600 in Shishikui, Awa with maximum height 7 meters.  50 were drowned at Sakihama and 350 more at Kannoura. More than 5,000 drowned in the area. To the east in the  Emjimada area castles at Tawara in Atsumi and Kakegawa were destroyed. 80% of the houses at Ari were washed away in the tsunami which hit the coast from Ise Shima to Boso. More than 1,000 people were drowned in this area.

 

 2  2 10 30  0 1879 -53.000  -70.670   0 7.3   So. So. America

 2  2 11 22 18 1920  -4.000  152.500  60 7.7   New Britain

 2  2  5  7 38 1923  53.500  162.000  60 7.2   E. of Kamchatka

 

Followed by a great earthquake in the area on Feb. 4. Tha earthquake triggered a strong tsunami which washed houses away at Kolgir Bay and Semljachik. Two were killed in flooding at Ostrovna. At Hawaii the sea recession stranded a ship on the harbor floor and caused up to $1.5 million damage while killing one. Felt with reported intensity X. Hunters noted snowslides, land creeps and fissures. Nomads tents were destroyed at Kronot Bay and it was impossible to stand. Chimneys were destroyed at Ust-Kamchatka and in the Kolygir and Ostravnaya Bays.  Felt strongly at Petropavlovsk, Kozyrevsk anf Klyuchi. Also felt at Tilgil.  The tsunami began as a recession and the sea bottom of Kolygir Bay was lain bare for 2 km.

 

 2  2  0  0 19 1929  -1.500  -21.000  60 7.1   Central Mid-Atlantic

 2  2 22 46 42 1931 -39.500  177.000  60 7.9   North Island, N.Z.

 

Also known as the Hawke Bay earthquake. This event caused great damage at Napier, Hastings and neighboring towns and was center close to the city of Napier. Uplift of 6-9 feet was observed along the coast in the Hawkes Bay region. At Napier buildings, bridges, and railways were damaged and water and electrical services were disrupted. Fires followed and did some damage. The harbor (inner and outer) rose by up to 8 feet and had to be dredged to the original depth afterwards. In some areas the depth changed from 42 to 24 feet. Houses on the beach were left far from shore.  One bluff collapsed into the sea and rivers and streams increased flow by up to 50%. At least 256 were reported killed in Napier, Hastings and Wairoa.  In Feb. 17 uplift occurred in Sponge Bay near Gisborne. Workers observed a boulder bank rise out of the sea without warning reaching a height of 7 feet and covering up to 2 acres. .

 

 

 2  2 17 41 29 1949  53.000 -173.000 220 7.0   Andreanoff Islands, Aleutians

 2  2 23 33 39 1950  21.700  100.100   0 7.0   Myanmar

 2  2  8 43 39 1975  53.113  173.497  10 7.6   Rat Islands

 

Felt with maximum intensity IX at Shemya air base where the runway was cracked and fissured for more than 1000 m. Fissures extended into the tundra with vertical throw of up to 4 cm. Sand fountains were observed. Two hangar doors were damaged at Shemya AFB. A water pipe ruptured. Heavy equipment was moved. Fifteen people were injured. A strong foreshock was recorded.

 

TODAY IN EARTHQUAKE HISTORY

 

 

U.S./CANADA

 

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

 

MO DA HR MN SC YEAR  LATIT   LONGIT  DEP MW  LOCATION

 

 

 2  2  0  0  0 1766  42.000  -68.000   0 5.0   Maine

 2  2  0 11  0 1881  36.000 -120.500   0 5.9   Central California

 

Felt strongly at Salinas (intensity III) and Visalia.

 

 

 2  2 12 52  0 1928  47.800 -121.700   0 5.0   Washington state, U.S.

 

Generally felt at Startup, WA with a strong shaking and roaring alarming people. Paper and Plaster cracked.

 

 2  2 17 41 29 1949  53.000 -173.000 220 7.0   Andreanoff Islands, Aleutians

 2  2  0  4 16 1961  37.400 -118.500  23 5.3   California/Nevada area

 2  2  0  7 42 1961  37.417 -118.667   0 5.1   California/Nevada area

 

Felt over an area of 13,500 sq. miles with maximum intensity V. Frightened may at Bigpine, Bishop, Laws and Long Valley in California. In Nevada objects were disturbed and a windmill swayed at Dyer.

 

 2  2  6 43 29 1962  36.500  -89.600  25 5.5   New Madrid area

 

Awakened and frightened many in the large area of Arkansas, Kentucky, Missouri, Tennessee and Illinois. Water pipes broke and walls and plaster were cracked at Catron. Chimneys were damaged at Marston. Damage with intensity V occurred in Arkansas and Union City, TN.

 

 2  2  0 48 56 1971  51.717 -173.204  49 5.2   Andreanoff Islands, Aleutians

 2  2 15 55 28 1974  61.602 -147.603  48 5.1   Central Alaska

 

Felt in Southern Alaska with intensity II. Felt strongly in Anchorage, Palmer and other communities.

 

 2  2  8 43  0 1975  53.100  173.400  10 7.6   Rat Islands, Aleutians

 

Felt with maximum intensity IX at Shemya air base where the runway was cracked and fissured for more than 1000 m. Fissures extended into the tundra with vertical throw of up to 4 cm. Sand fountains were observed. Two hangar doors were damaged at Shemya AFB. A water pipe ruptured. Heavy equipment was moved. Fifteen people were injured. A strong foreshock was recorded.

 

 2  2  9 28 34 1982  25.828 -109.508  10 5.2   Gulf of California

 2 02 00 38 17 2011  54.974 -160.465  35 5.9   Unimak Island, Aleutians

 

ERATE QUAKE SHAKES TOKYO, JAPAN REGION

 

EARTHQUAKE SUMMARY FOR JANUARY 31, 2020

 

A moderate earthquake of M 5.3 was felt in the region of Tokyo, Japan today. NEIC reported maximum intensity V in Japan at Ibaraki, Chiba; and III in Saitama. A foreshock of M 5.1-5.2 was felt with maximum intensity IV in Chiba and II-III in Tokyo, Kanagawa, and Saitama, Japan. The last event of M>=5.3 within about 100 km of Tokyo was an M 5.3 on May 17, 2018. An M 5.6 occurred about 100 km east of today's event on January 2, 2020. Forecast 121506 had expected today's event within about 50 km of these epicenters was likely around January 31.

 

O: 31JAN2020 16:11:24  35.7N  140.6E mb=5.1  EMSC   NEAR EAST COAST OF HONSHU, JAP

O: 31JAN2020 17:07:47  35.9N  140.1E Mw=5.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 31JAN2020 121506    36.0N  141.0E 4.0-5.3 AAAAA  Off East Coast Honshu      

 

The strongest earthquake in the world today was an M 5.7 south of the Fiji Islands. This is the strongest earthquake within about 150 km of this epicenter since an M 6.5 also (like today's hypocenter) at 576 km depth on September 16, 2018. Forecast 121628 had expected today's event within about 50 km at the end of  January. This earthquake is located at 144 degrees from the M 6.8 in Turkey of  January 24 and may have been promoted by concentrated energy from this source.

 

O: 31JAN2020 13:53:31  25.4S  178.5E Mw=5.7  EMSC   SOUTH OF FIJI ISLANDS        

P: 26JAN2020 121628    25.0S  179.0E 4.0-5.4 BAAAA  Tonga/Fiji                 

 

The strongest earthquake in the U.S. or Canada today was an M 5.1 in the Gulf of Alaska. NEIC noted it might have been felt with intensity II in Kodiak, Alaska.

This is the strongest aftershock in the Gulf of Alaska of the M 7.9 on January 23, 2018 since an M 5.5 on May 8, 2018. Only one other event of M>=5.1 has occurred within about 150 km of this epicenter in the past 30 years - an M 5.2 on April 7, 2018. Forecast 121598 had expected today's event within about 100 km of the epicenter was likely at the end of January. Like earthquakes in Iceland today, these epicenters are near the sixth node (60 degrees) from the event south of Cuba of January 28 and may have been promoted by energy from that source.

 

O: 31JAN2020 11:25:37  55.9N  149.4W Mw=5.1  EMSC   GULF OF ALASKA               

P: 25JAN2020 121598    54.9N  149.8W 3.0-4.5 CAAAA  Gulf of  Alaska            

 

A series of earthquakes in Iceland today included an M 4.0 and 3.9. These earthquakes are located near the sixth node (60 degrees) from the event of M 7.7 near Cuba and may indicate incipient volcanism promoted by seismic energy from the Caribbean.

 

O: 31JAN2020 22:54:06  63.9N   22.4W ML=3.3  EMSC   ICELAND REGION

O: 31JAN2020 21:45:46  63.9N   22.4W ML=3.4  EMSC   ICELAND REGION

O: 31JAN2020 22:24:55  63.9N   22.4W ML=3.9  EMSC   ICELAND REGION

O: 31JAN2020 22:22:21  63.9N   22.4W ML=4.0  EMSC   ICELAND REGION

O:  1FEB2020 00:07:22  63.9N   22.4W ML=3.0  EMSC   ICELAND REGION               

 

Moderate earthquakes also resumed today in Eastern Turkey. The largest these - an M 4.6 - was felt lightly in the region of Elazig. Forecast 121531 had expected this activity within about 50 km was likely around February 1. This activity is at 101-103 degrees from Cuba and may have been promoted by the M 7.7 there two days ago.

 

O: 31JAN2020 15:36:12  38.4N   39.2E ML=3.9  EMSC   EASTERN TURKEY               

O: 01FEB2020 00:03:48  38.4N   39.2E ML=4.3  EMSC   EASTERN TURKEY

O: 31JAN2020 23:32:50  38.5N   39.3E mb=4.6  EMSC   EASTERN TURKEY               

P:  1FEB2020 121531    38.0N   39.0E 3.5-4.8 AAAAA  Turkey                     

 

EASTERN EUROPE CONTINUES AT ACTIVE STATE

 

EARTHQUAKE SUMMARY FOR JANUARY 30, 2020

 

Earthquake activity continued from Greece and Turkey northward to Romania today.

This is likely related to the M 7.7 in Cuba of January 28 as it is, for the most part, at or near the fourth node (90 degrees) or near 100-103 degrees from that epicenter. An earthquake of M 4.8 shook a wide band of Romania today. NEIC reported this event was felt with maximum intensity IV in Romania a Homocea Vrancea, Letea Veche, Bacau, and Sendreni, Galati and II-III in Romania at Buzau, Sacele, Brasov, Hemeius, Ploiesti and Smardan. The last earthquake of M>=4.8 in Romania occurred on October 28, 2018 (M 5.5) and prior to that on December 27, 2016 (M 5.6). Forecast 121556 had expected activity in Romania was likely at the end of January.

 

O: 31JAN2020 01:26:47  45.7N   26.7E mb=4.8  EMSC   ROMANIA                      

P: 25JAN2020 121566    43.0N   22.0E 3.0-5.1 CCCAA  Romania/NW Turkey          

 

The strongest earthquake in the world today was an M 5.8 south of Romania in the currently active zone of the Dodecanese Islands, Greece. NEIC reported it was felt in Greece with intensity II-III in Rodos, Dodecanese Islands and in Rentina, Karditsa. This continues a series of moderate to moderately large earthquakes in the Dodecanese Islands a 90 degrees from the Cuba epicenter in the past several days. Forecast 121479 had expected today's activity was likely within about 200 km of this epicenter around January 28.

 

O: 30JAN2020 11:21:36  35.1N   27.8E Mw=5.7  EMSC   DODECANESE ISLANDS, GREECE   

O: 31JAN2020 04:34:38  35.1N   28.0E mb=4.7  EMSC   DODECANESE ISLANDS, GREECE   

P: 28JAN2020 121479    36.0N   26.0E 3.0-4.5 BAAAA  Aegean Sea                 

 

A strong earthquake of M 5.9 also shook the region near the north coast of New Guinea today. The last events within about 200 km of this epicenter with M>=5.9 occurred on January 27, 2019 and January 26, 2018 (M 6.2-6.3) and June 2, 2017 (M 5.9).  Forecast 121424 had expected this activity about 150 km to the south around January 26. This epicenter is located at 105 degrees from the M 6.8 in Turkey of January 24 and was probably promoted by energy from that event.

 

O: 31JAN2020 02:19:09   3.3S  146.0E mb=4.9  EMSC   NEAR N COAST OF NEW GUINEA, PN

O: 31JAN2020 03:15:22   3.3S  146.2E mb=4.4  EMSC   BISMARCK SEA                 

O: 30JAN2020 22:38:55   3.4S  146.2E Mw=5.9  EMSC   BISMARCK SEA                 

P: 26JAN2020 121424     5.0S  146.0E 4.0-5.3 BBAAA  New Ireland                

 

The western Andreanof Islands of the Aleutians, Alaska continued today. The strongest earthquake in the U.S. or Canada was an M 4.6 in this region. It was not reported felt in this remote area. It appears to be an outer rise events. Such earthquakes occur on the outer rise of subduction zones and have been linked to later major earthquakes downslope in the subduction zone. Today's event occurred south of the M 6.2 of January 23. It is the largest event in the outer rise within about 100 km of this epicenter since an M 5.4 on September 9, 2019 and prior to that an M 4.8 on August 10, 2018. It is the first south of 50 North latitude in the area since an M 4.9 on August 18, 2013. The only other such event in this area in the past 30 years was an M 4.8 on July 27, 1994. Forecast 121575 had expected today's event within about 100 km was likely around January 31.

 

O: 30JAN2020 18:34:00  49.9N  177.8W mb=4.6  EMSC   SOUTH OF ALEUTIAN ISLANDS    

P: 31JAN2020 121575    51.0N  177.1W 3.5-4.8 ABAAA  Andreanoff Isls, Aleutians 

 

FAR-FIELD SEISMICITY UP AFTER M 7.7 NEAR JAMAICA

 

EARTHQUAKE SUMMARY FOR JANUARY 29, 2020

 

A series of moderately strong to strong earthquake occurred at nodal distances from the M 7.7 in Cuba. Local, but unusual quakes were also recorded in northern Puerto Rico. The largest far-field events included an M 5.6 in the Dodecanese Islands, a series of events in Iran-Iraq, an M 3.8 in eastern Hawaii, an M 5.7 in Molucca and an M 6.0 in the Solomon Islands. The strongest earthquake in the world today was an M 6.0 in the Solomon Islands. NEIC reported it was felt with intensity III in Honiara, Guadalcanal and Auki Malaita, Solomon Islands. This is the second strong earthquake to hit near this epicenter in the past several days. An M 6.3 also was recorded about 50 km northwest of today's epicenter on January 27. At the time this summary noted:

 

 

"The strongest earthquake of the day occurred as an M 6.3 in the Solomon Islands in the south Pacific. It was reported felt with intensity VI in Kirakira Makira and Ulawa, Solomon Islands and IV in Honiara, Guadalcana dn Buala Isabel, Solomon Islands. This is the largest earthquake within about 200 km of this epicenter since an M 6.5 on September 9, 2018 and prior to that an M 6.5 on January 19, 2017. Forecast 121363 had expected this event within about 100 km was likely at the end of January." (January 27, 2020)

 

Today's epicenter is at the third node (120 degrees) from the event near Jamaica of January 28 and may have been promoted by energy from that source.

 

O: 29JAN2020 13:49:50  10.3S  161.3E Mw=6.0  EMSC   SOLOMON ISLANDS              

P: 20JAN2020 121363    10.0S  162.0E 4.0-5.3 CAAAA  No. of Santa Cruz Islands  

 

A moderately strong M 5.7 earthquake also shook the Molucca Sea, Indonesia today. Molucca had been expected to see enhanced seismicity at this time due to its distance (144-149 degrees) from the M 7.7 in Cuba of January 28. In the previous issue of this summary it had been noted in this regard:

 

"The earthquake near Cuba may reset global seismicity as it is the strongest in nearly a year in the world. Far-field triggering is most likely in eastern Turkey, Iran/Iraq and the east African Rift valley as well as in Hokkaido and northern Japan (103 degrees); in Molucca, southeast Asia, Central Philippines, New Guinea (144 degrees); Southern California (51 degrees); Greece and western Turkey (90 degrees); Andreanof Islands (72 degrees); among others." (January 29, 2020)

 

Prior the event in Cuba, the last major (M>=7) earthquake in the world occurred with M 7.1 on November 14, 2019 and today's event is probably an aftershock of that. Forecast 121411 had expected today's activity was likely in late January.

 

O: 29JAN2020 23:46:56   0.7N  126.3E Mw=5.7  EMSC   MOLUCCA SEA                  

O: 30JAN2020 01:02:46   1.5N  126.5E mb=4.6  EMSC   MOLUCCA SEA                  

P: 31JAN2020 121411     2.0N  126.0E 4.0-5.3 AAAAA  Mindanao, Philippines      

 

A series of moderate earthquakes hit the Dodecanese Islands of Greece today. The strongest of these was an M 5.2-5.6. This continues a series of earthquake in the area which began with an M 5.4 on January 28, 2020. The last earthquakes in the area of M>=5.6 occurred on August 8, 2019 and March 20, 2019 with M 5.7-5.8

Forecast 121479 had expected today's activity was likely about 150 km to the west around January 28. This activity may have been promoted from the M 7.7 in Cuba of January 28. It is located at the fourth node from that epicenter (90 degrees).                                         

 

O: 30JAN2020 05:43:58  35.0N   27.8E ML=4.3  EMSC   EASTERN MEDITERRANEAN SEA

O: 29JAN2020 13:37:00  35.0N   27.8E mb=4.7  EMSC   DODECANESE ISLANDS, GREECE

O: 30JAN2020 05:12:04  35.1N   27.9E mb=4.5  EMSC   DODECANESE ISLANDS, GREECE

O: 30JAN2020 01:28:09  35.1N   27.9E mb=5.2  EMSC   DODECANESE ISLANDS, GREECE

O: 30JAN2020 01:28:06  35.2N   27.9E mb=5.6  ANSS   DODECANESE ISLANDS, GREECE

O: 30JAN2020 02:10:55  35.3N   27.6E mb=4.4  EMSC   DODECANESE ISLANDS, GREECE   

O: 30JAN2020 01:46:32  35.7N   28.2E mb=4.2  EMSC   EASTERN MEDITERRANEAN SEA    

P: 28JAN2020 121479    36.0N   26.0E 3.0-4.5 AABAA  Aegean Sea                 

 

An M 3.8 in the Leilani Estates region of Hawaii today was widely felt. NEIC reported IV at Pahoa and II-III at Mountain View, Kurtistown, Volcano, Keaau, Hawaii National Park,  Hilo, Papaikou, Pepeeleo and Hakalau, Hawaii. This is the area where a strong eruption occurred in the summer of 2018 which stopped short on August 9, 2018. The only earthquake in the area of stronger magnitude since then was an M 5.5 on March 13, 2019 about 25 km west of today's epicenter. Forecast 121467 had expected today's event was likely within about 25 km of this epicenter around January 27. This epicenter is located at the fifth node (72 degrees) from the M 7.7 in Cuba of January 28 and was probably promoted from that source. If this is the case further seismicity and perhaps volcanism may follow in Hawaii.

 

O: 29JAN2020 22:23:26  19.3N  155.0W Ml=3.8  EMSC   HAWAII REGION, HAWAII        

P: 27JAN2020 121467    19.3N  155.3W 4.0-5.3 AAAAA  Hawaii area                

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the active region of the western Andreanof Islands where several events of M>=6 have occurred in late January. Today's earthquake was not reported felt in this remote area. Forecast 121575 had expected this activity was likely at the end of January. This epicenter at the fourth  node  (90 degrees)from Cuba and may have been affected by energy from that major earthquake.

 

O: 30JAN2020 06:10:19  51.1N  179.9W mb=4.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24JAN2020 121575    51.0N  179.1W 3.5-4.8 CAAAA  Andreanoff Isls, Aleutians 

P: 31JAN2020 121575    51.0N  177.1W 3.5-4.8 AABAA  Andreanoff Isls, Aleutians 

 

Aftershocks continued in the area of Cuba today. The strongest of these was an M 5.1 north of Jamaica. NEIC reported it was felt with maximum intensity IV in George Town, Grand Cayman Islands and II in West Bay and Playa del Carmen, Grand Cayman Islands and II-III in Jamaica at Montego Bay, Alligator Pond, Half Way Tree and Kingston. This is the first major aftershock near the epicenter of the January 28 M 7.7 Forecast 121439 had expected this activity at the end of January.

 

O: 29JAN2020 15:01:40  19.0N   80.7W mb=4.0  EMSC   CAYMAN ISLANDS REGION        

O: 29JAN2020 14:14:43  19.2N   79.8W mb=4.1  EMSC   CAYMAN ISLANDS REGION        

O: 29JAN2020 14:53:14  19.4N   78.6W mb=5.1  EMSC   CUBA REGION                  

P: 31JAN2020 121439    19.0N   81.0W 3.5-5.0 AABAA  Caribbean Sea               

 

An earthquake midway between Northern Puerto Rico and the Dominican Republic of M 4.5 also occurred today. NEIC reported intensity II-III for this event in Puerto Rico at Aguadilla, Penuelas, Bayamon, and in the Dominican Republic at Otra Banda, El Carni, Moca Espaillat, and El Llano and in Toad Town, British Virgin Islands This is an unusual epicenter. The last event within about 50 km of this epicenter occurred as an M 6.0  on September 27, 2019, the first in the current active period in Puerto Rico. Forecast 121458 had expected today's event to the southeast around January 29. This is getting close to the Puerto Rico Trench where a major subduction type earthquake is possible. When the M 6.0 occurred on September 24, 2019 this summary noted:

 

"NEIC reported the mainshock was felt with maximum intensity V in Puerto Rico at San Antoniom Quebradillas, IV in Aguadilla, Isabela, Aguada, Rincon, Camuy, and Anasco and within about 200 km of the epicenter in the Puerto Rico trench. A series of moderate aftershocks including an M 5.0 and 4.4 were felt in a similar area. An aftershock of M 4.3 was felt in Puerto Rico with maximum intensity V in Camuy and Hatillo; IV in Isabela, Quebradillas, Aguada, Rincon and Mayaguez and II-III in Aguadilla, Moca and San Sebastian among others. The aftershocks suggest that the activity is not over and that the M 6.0 may not have used up the available seismic energy in the trench. It has been nearly 75 years since a strong tsunami hit in this area but such an event remains a possibility. Built structures could be vulnerable to a strong tsunami such as that in 1946. Thanks in large part to international and governmental efforts, the potential for a large tsunami in the area has been recognized and preparations for such

an event have been made." (September 24, 2019)

 

 

O: 29JAN2020 14:22:45  19.0N   67.6W ML=3.6  EMSC   PUERTO RICO REGION

O: 29JAN2020 14:27:34  19.0N   67.6W mb=4.5  EMSC   PUERTO RICO REGION

O: 29JAN2020 14:53:39  19.2N   67.7W ML=3.1  EMSC   PUERTO RICO REGION

O: 30JAN2020 06:33:19  19.0N   67.5W ML=3.3  EMSC   PUERTO RICO REGION           

P: 29JAN2020 121458    18.0N   66.0W 3.4-4.9 AAAAA  Puerto Rico                

 

MAJOR QUAKE HITS SOUTH OF CUBA

 

EARTHQUAKE SUMMARY FOR JANUARY 28, 2020

 

An M 7.7 south of Cuba today was widely felt throughout the Caribbean and southeastern U.S. But if was far enough from land that there were no major damages or casualties reported with this event. An M 6.0 aftershock in the Cayman Islands followed. Tsunamis are common with earthquake of this magnitude but it was probably strike-slip motion which does not lift the surface greatly and, while the Pacific Tsunami Warning Center warned of a possible tsunami of 1-3 feet, but such a tsunami was not observed. This is the strongest earthquake in the world since an M 8.0 in Northern Peru-Brazil on May 26, 2019 and two of M 8.2 and 7.9 in the Tonga-Fiji area in August and September, 2018. This is the strongest event within about 500 km of this epicenter since an M 7.9 in 1900 and an M 7.8 on June 14, 1899. Lesser earthquakes within the area of about 500 km from this epicenter have most recently occurred on February 4, 2007 (M 6.2); and on May 25, 1992 (M 6.8). Three events about 200 km to the west occurred on June 27, 1995 (M 6.0); September 9, 2004 (M 6.0) and December 14, 2004 (M 6.8). The strongest historical events in the area occurred on June 21, 1900 (M 7.9); June 14, 1899 (M 7.8) and in 1692 (M 7.7-7.8). Today's earthquake is a 100 degrees from the M 6.8 in Eastern Turkey of January 24. It is likely to have been promoted by seismic energy from that source. Forecast 121439 had expected today's activity within about 50 km of the  Cayman Islands was likely around January 31.

 

The M 7.7 was felt with maximum intensity V in Lucea and IV in Grange Hill, Negril, Montego Bay, Anchovy, Petersfield and Bethel Town, Jamaica and II-III in Jamaica at Sandy Bay, Little London and Hopewell. It was also felt in Cuba and in eastern North America as far north as Ontario, Canada more than 2000 km away from the epicenter. States reporting intensity II-III included Jalisco, Mexico and in the U.S. in New York, Michigan, Oklahoma, Pennsylvania,  Ohio, Indiana, Maryland, Arkansas, Washington DC, Louisiana, Texas, Kentucky, Tennessee, Alabama, South and North Carolina, Georgia, Florida.    Also reported felt in Anguilla, Venezuela, the Virgin Islands, Guatemala, Mexico, Puerto Rico, Belize, the Dominican Republic, Caicos Islands, Haiti, Bahamas, Saint Kitts and Nevis, Ecuador among others.  The M 6.1 in the Grand Cayman Islands, an aftershock of the M 7.7 was felt with maximum intensity VI in Santiago de Cuba; IV in Bodden Town, George Town and West Bay, Grand Cayman and II-III in East End, Cayman Islands and Varadero, Cuba. Giant Sinkholes opened up in the Cayman Islands. The epicenter of the earthquake in Cuba is antipodal to Tropical Cyclone Claudia which passed north of Australia two weeks ago. This summary had noted its possible effect on Caribbean seismicity at the time as:

 

"TC Claudia continued today in the region north of Western Australia with winds up to 50 kts. It is expected to track to the west over the next several days. It will be antipodal to the Haiti and the Dominican Republic today and may help continue aftershocks in that area for the next several days." (January 15-16, 2020)

 

The earthquake near Cuba may reset global seismicity as it is the strongest in nearly a year in the world. Far-field triggering is most likely in eastern Turkey, Iran/Iraq and the east African Rift valley as well as in Hokkaido and northern Japan (103 degrees); in Molucca, southeast Asia, Central Philippines, New Guinea (144 degrees); Southern California (51 degrees); Greece and western Turkey (90 degrees); Andreanof Islands (72 degrees); among others.

 

O: 29JAN2020 04:37:29  18.9N   80.8W mb=4.1  EMSC   CAYMAN ISLANDS REGION

O: 29JAN2020 01:18:08  18.9N   80.8W mb=4.3  EMSC   CAYMAN ISLANDS REGION

O: 29JAN2020 05:16:44  18.9N   80.8W mb=4.3  EMSC   CAYMAN ISLANDS REGION

O: 29JAN2020 00:41:56  18.9N   80.8W mb=4.4  EMSC   CAYMAN ISLANDS REGION

O: 29JAN2020 02:13:15  19.0N   80.8W mb=4.4  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 19:32:56  18.9N   80.6W ML=4.5  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 20:29:02  19.0N   80.2W mb=4.1  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 22:16:09  19.0N   80.7W mb=4.4  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 22:58:21  19.0N   80.8W mb=4.4  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 21:55:17  19.0N   80.9W Mw=6.1  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 23:04:23  19.0N   80.9W mb=4.4  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 21:00:00  19.0N   80.9W mb=4.9  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 22:45:01  19.1N   80.1W mb=4.4  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 20:39:45  19.3N   79.2W mb=4.7  EMSC   CAYMAN ISLANDS REGION

O: 28JAN2020 19:10:26  19.4N   79.0W Mw=7.7  EMSC   CUBA REGION                  

P: 31JAN2020 121439    19.0N   81.0W 3.5-5.0 BAAAA  Caribbean Sea              

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the currently active area of western Andreanof Islands. This area has seen several events of M>=6 in the past 8 days. Today's event was not reported felt in this remote region. Forecast 121575 had expected today's actvity around January 24.

 

O: 28JAN2020 16:41:43  51.2N  179.9W mb=4.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24JAN2020 121575    51.0N  179.1W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

MODERATE EARTHQUAKE SHAKES HOKKAIDO, JAPAN

 

EARTHQUAKE SUMMARY FOR JANUARY 27, 2020

 

The strongest earthquake in the world today was an M 5.5 in the Kuril Islands east of Hokkaido, Japan. NEIC reported this earthquake of M 5.5 in Hokkaido, Japan  was felt with intensity II-III in the area(s) of Hokkaido, Japan at Misawa and Aomori. This is the largest earthquake within about 200 km of this epicenter in the Kurils since an M 5.9 more than a year ago on November 4, 2018.

Forecast 121543 had expected today's event within about 100 km was likely around January 26.

 

O: 28JAN2020 01:36:03  43.5N  146.0E mb=5.5  EMSC   KURIL ISLANDS                

P: 26JAN2020 121543    43.0N  147.0E 3.5-5.3 AAAAA  Hokkaido, Japan            

 

The strongest earthquake in the U.S. or Canada today was an M 5.2 in the western Andreanof Islands, Aleutians. This is part of a series of moderate to strong earthquakes which has afflicted the region in the past 10 days. As it stands alone today, it is likely to be near the end of this sequence. Forecast 121575 had expected this event was likely around January 24.

 

O: 27JAN2020 15:51:50  51.2N  179.8W mb=5.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24JAN2020 121575    51.0N  179.1W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

Other aftershock zones also showed moderate seismicity today. In Eastern Turkey, an M 4.4 was lightly felt but did not do any major damage. In Puerto Rico the largest event of the day was an M 4.4 which was also reported felt in Ponce without

 additional damage. The earthquake in Turkey had been expected within about 50 km of that epicenter in late January or early February in forecast 121531. The event in Puerto Rico had likewise been expected within about 50 km to occur around January 29 (forecast 121458).

 

O: 27JAN2020 16:12:00  38.4N   39.1E mb=4.4  EMSC   EASTERN TURKEY               

P:  1FEB2020 121531    38.0N   39.0E 3.5-4.8 BAAAA  Turkey                     

 

O: 27JAN2020 06:53:23  17.9N   66.6W mb=4.4  EMSC   PUERTO RICO REGION           

P: 29JAN2020 121458    18.0N   66.0W 3.4-4.9 AAAAA  Puerto Rico                

 

STRONG QUAKE IN SOLOMON ISLANDS

 

EARTHQUAKE SUMMARY FOR JANUARY 26, 2020

 

The strongest earthquake of the day occurred as an M 6.3 in the Solomon Islands in the south Pacific. It was reported felt with intensity VI in Kirakira Makira and Ulawa, Solomon Islands and IV in Honiara, Guadalcanal and Buala Isabel, Solomon Islands. This is the largest earthquake within about 200 km of this epicenter since an M 6.5 on September 9, 2018 and prior to that an M 6.5 on January 19, 2017. Forecast 121363 had expected this event within about 100 km was likely at the end of January.

 

O: 27JAN2020 05:02:04  10.1S  161.0E Mw=6.3  EMSC   SOLOMON ISLANDS              

P: 20JAN2020 121363    10.0S  162.0E 4.0-5.3 CAAAA  No. of Santa Cruz Islands  

 

As it has for several days, the strongest seismicity in the U.S. or Canada today occurred in the Aleutian Islands of Alaska. This seismicity appears to be migrating to the west and included several moderate earthquake in the Rat Islands west of the Andreanof Islands today. These including event of M 4.4, 4.4,  4.2 and 4.6 among others. The strongest earthquakes in the Andreanof Islands were of M 5.2, 5.6 and 5.8. In the previous issue of this summary this had been noted as:

 

" the M 6.0 occurred on January 23, 2020. The last earthquake within about 100

km of the mainshock with M>=6 occurred about 100 km to the east on December 2, 2019. The last in the Andreanof Islands closer than 100 km to today's activity was an M 6.6 on April 16, 2008. Forecast 121575 had expected today's activity in this area was likely around January 24. This activity may have been enhanced by the new moon which arrived yesterday." (January 25-26, 2020)

 

O: 26JAN2020 07:08:12  50.9N  179.9W mb=4.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 07:39:32  50.9N  180.0E mb=4.4  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 26JAN2020 23:49:34  51.0N  179.9E mb=4.4  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 26JAN2020 07:51:49  51.0N  180.0W mb=4.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 10:29:17  51.1N  179.8W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 08:41:16  51.1N  179.9W mb=4.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 09:12:05  51.2N  179.7W Mw=5.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 07:24:06  51.2N  179.9W Mw=5.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 08:11:57  51.2N  179.9W mb=4.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 22:40:26  51.2N  180.0W mb=4.6  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 26JAN2020 09:10:04  50.8N  179.8E mb=4.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 26JAN2020 22:33:39  51.3N  179.9W Mw=5.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24JAN2020 121575    51.0N  179.1W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

P: 28JAN2020 121583    51.0N  178.0E 4.0-5.5 AAAAA  Rat Islands                

 

Moderate sized earthquakes continued in Puerto Rico today. NEIC reported these were felt with intensity IV-VII in Ponce, and II-III in Santa Isabel, San German, Corozal, Isabela, Rincon, Puerto Rico and in Road Town, Virgin Islands.

Following are events in Puerto Rico today of M>=4. A listing of events of M>=3 is located in the "AMERICA" section below. Forecast 121458 had expected this activity was likely around January 29.

 

O: 26JAN2020 17:19:05  17.8N   66.8W ML=4.3  EMSC   PUERTO RICO REGION

O: 27JAN2020 05:57:47  17.8N   66.8W mb=4.3  EMSC   PUERTO RICO REGION

O: 27JAN2020 05:20:39  17.9N   66.6W mb=4.2  EMSC   PUERTO RICO REGION

O: 27JAN2020 06:53:23  17.9N   66.6W mb=4.4  EMSC   PUERTO RICO REGION

P: 29JAN2020 121458    18.0N   66.0W 3.4-4.9 BAAAA  Puerto Rico                

 

One moderate event in Puerto Rico occurred about 150 km north of the aftershock zone with M 4.3. This had been expected around January 26.

 

O: 27JAN2020 03:15:15  19.2N   67.1W mb=4.3  EMSC   PUERTO RICO REGION           

P: 26JAN2020 121463    20.0N   67.0W 3.0-4.4 AAAAA  Bahamas/No. Caribbean      

 

Aftershocks in the Barstow area of Southern California also continued today. An M 2.9 was felt with intensity II-III in Barstow and Newberry Springs, California. The M 2.9 in this area today occurred within about 10 km of forecast epicenter 121520 which had expected this around January 26.

 

O: 27JAN2020 05:25:22  35.0N  116.9W ML=2.9  EMSC   SOUTHERN CALIFORNIA          

P: 26JAN2020 121520    35.1N  117.0W 2.5-4.4 AAAAA  So. California             

 

STRONG QUAKES CONTINUE IN  ANDREANOF ISLANDS, ALASKA

 

EARTHQUAKE SUMMARY FOR JANUARY 25, 2020

 

The strongest earthquakes in the world today were located in western Andreanof Islands, Aleutians, Alaska. The largest of these was an M 6.0 but associated shocks of M 5.6 and 5.3 also occurred. The largest was probably felt in Adak, Alaska. An M 6.2 about 200 km to the east of the M 6.0 occurred on January 23, 2020. The last earthquake within about 100 km of the mainshock with M>=6 occurred about 100 km to the east on December 2, 2019. The last in the Andreanof Islands closer than 100 km to today's activity was an M 6.6 on April 16, 2008. Forecast 121575 had expected today's activity in this area was likely around January 24. This activity may have been enhanced by the new moon which arrived yesterday.

 

O: 26JAN2020 03:57:24  51.3N  179.9W Mw=5.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 06:31:59  51.3N  179.9W Mw=6.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 26JAN2020 06:40:53  51.3N  179.9W mb=5.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 25JAN2020 23:28:32  51.3N  179.8W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24JAN2020 121575    51.0N  179.1W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

 

After several days of low seismicity in Puerto Rico, the aftershock sequence restarted today north of the previous epicenters. An M 4.7-5.0 was felt throughout Puerto Rico with maximum intensity VI in Puerto Rico at Utuado; V in Cabo Rojo; IV in Adjuntas, Hatillo and II-III in Lares, Camuy, Moca, Isabela, Manati and Rincon. Other events in the area of M>=4 were two of M 4.2. The M 4.7-5.0 quake is the strongest aftershock in Puerto Rico since an M 5.2 on January 15, 2020. It occurred about 10 km north of the major aftershock sequence and may indicate migration of stresses to the north. Forecasts 121458 had expected this activity was likely around January 24. This activity is located at the fourth node (90 degrees) from the M 6.8 in eastern Turkey of January 24 and may have been promoted by energy from that source.

 

O: 26JAN2020 01:59:26  17.8N   66.8W ML=3.6  EMSC   PUERTO RICO REGION

O: 25JAN2020 14:17:38  17.8N   66.8W ML=4.2  EMSC   PUERTO RICO REGION

O: 25JAN2020 09:08:43  17.8N   68.6W ML=3.4  EMSC   DOMINICAN REPUBLIC REGION

O: 26JAN2020 01:21:13  17.9N   66.8W ML=3.1  EMSC   PUERTO RICO REGION

O: 26JAN2020 02:51:43  17.9N   66.8W ML=3.1  EMSC   PUERTO RICO REGION

O: 25JAN2020 22:22:40  17.9N   66.8W ML=3.2  EMSC   PUERTO RICO REGION

O: 25JAN2020 10:32:20  17.9N   66.9W Md=3.8  EMSC   PUERTO RICO

O: 25JAN2020 08:00:46  17.9N   66.9W Mw=4.2  EMSC   PUERTO RICO REGION

O: 25JAN2020 18:12:11  17.9N   67.0W ML=3.1  EMSC   PUERTO RICO REGION

O: 25JAN2020 09:22:45  18.0N   66.7W Md=3.0  EMSC   PUERTO RICO REGION

O: 25JAN2020 20:20:37  18.0N   66.8W Mw=4.7  EMSC   PUERTO RICO

O: 25JAN2020 20:20:37  18.0N   66.8W Mw=5.0  ANSS   PUERTO RICO

O: 25JAN2020 20:34:15  18.1N   66.8W ML=3.6  EMSC   PUERTO RICO                  

P: 24JAN2020 121458    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

Moderate aftershocks continued today in the region of Eastern Turkey. The largest of these was an M 5.1 felt in the Elazig region of eastern Turkey.

NEIC reported this earthquake of M 5.1 in Eastern Turkey was felt with intensity II-III in the area(s) of Eastern Turkey at Doganyol, Malatya, Turkey and in Urfa. An M 4.4 was reported felt with intensity V in Batman, Turkey.

These are aftershocks of the M 6.8 which hit the area yesterday. Tolls in the earthquake now number at least 31 dead and more than 1607 injured. Buildings continued to collapse. Cold weather down to 10 F hindered rescue efforts today. In the previous issue of this summary it was noted in regard to the mainshock:

 

 

"A strong earthquake M 6.8 hit eastern Turkey today. Initial reports are that the quake killed at least 19 and injured more than 600 near Elazig, eastern Turkey. Strong shaking was felt by about half a million people. Internet pictures showed collapsed buildings and rescue teams in the area. The deaths occurred in Elazig province and in Malatya dn Diyarbakir according to Turkey's Disaster and Emergency Management Presidency (AFAD) which also noted that 10  or more buildings had collapsed. Tolls are expected to rise as at least 30 are missing in Elazig Province. The earthquake was shown live on EDESSA TV.

NEIC reported maximum intensity VIII in Kemalive, Erzincan and VI in Turkey at Elazig, Sincik and Malatya; IV in Yesilyurt, Adryaman, Tunceli, Diyarbakie and IV in Mazgirt, and Dogansehir.  It was also reported felt in Israel, Iran, Azerbaijan, Romania, Russia, Egypt, Jordan, Iraq, Lebanon, Syria and Georgia. It is likely that this earthquake was triggered by strong tidal stresses associated with the new moon today as it occurred at the longitude of maximum stress within several hours of the new moon completion Today's event is the strongest quake in the world since an M 7.1 in Molucca on November 14, 2019 and the second strongest in the past half year. This summary had expected it in the tidal forecast published in previous issues as:

 

"The New Moon will arrive on January 24, 2020 at 21:42 UT. Longitudes which are at local solar midnight at this time are near 40 East while those which are at local solar noon (subsolar) are near 140 West. These include areas of eastern Turkey and eastern Europe in the east and in eastern Alaska south to British Columbia, Canada in the west. While many areas of the world can be activated by tidal stresses these are the areas which see the strongest tidal stresses with this new moon. Global seismicity is expected to be slightly enhanced during the coming week." (January 22-25, 2020)

 

O: 25JAN2020 10:14:57  38.2N   38.8E ML=4.5  EMSC   EASTERN TURKEY

O: 26JAN2020 02:22:45  38.3N   38.8E ML=4.5  EMSC   EASTERN TURKEY

O: 25JAN2020 16:30:07  38.4N   39.0E Mw=5.1  EMSC   EASTERN TURKEY

O: 25JAN2020 16:44:01  38.4N   39.1E ML=4.4  EMSC   EASTERN TURKEY

O: 25JAN2020 08:40:04  38.4N   39.3E ML=4.4  EMSC   EASTERN TURKEY

O: 25JAN2020 16:46:59  38.5N   39.1E ML=4.4  EMSC   EASTERN TURKEY               

P: 16JAN2020 121290    39.0N   40.0E 3.5-4.8 CAAAA  Turkey                     

P:  1FEB2020 121531    38.0N   39.0E 3.5-4.8 CAAAA  Turkey                     

 

NEW MOON TIDES TRIGGER DEADLY QUAKE IN EASTERN TURKEY

 

EARTHQUAKE SUMMARY FOR JANUARY 24, 2020

 

A strong earthquake M 6.8 hit eastern Turkey today. Initial reports are that the quake killed at least 19 and injured more than 600 near Elazig, eastern Turkey. Strong shaking was felt by about half a million people. Internet pictures showed collapsed buildings and rescue teams in the area. The deaths occurred in Elazig province and in Malatya dn Diyarbakir according to Turkey's Disaster and Emergency Management Presidency (AFAD) which also noted that 10  or more buildings had collapsed. Tolls are expected to rise as at least 30 are missing in Elazig Province. The earthquake was shown live on EDESSA TV. NEIC reported maximum intensity VIII in Kemalive, Erzincan and VI in Turkey at Elazig, Sincik and Malatya; IV in Yesilyurt, Adryaman, Tunceli, Diyarbakie and IV in Mazgirt, and Dogansehir. It was also reported felt in Israel, Iran, Azerbaijan, Romania, Russia, Egypt, Jordan, Iraq, Lebanon, Syria and Georgia. It is likely that this earthquake was triggered by strong tidal stresses associated with the new moon today as it occurred at the longitude of maximum stress within several hours of the new moon completion Today's event is the strongest quake in the world since an M 7.1 in Molucca on November 14, 2019 and the second strongest in the past half year. This summary had expected it in the tidal forecast published in previous issues as:

 

"The New Moon will arrive on January 24, 2020 at 21:42 UT. Longitudes which are at local solar midnight at this time are near 40 East while those which are at local solar noon (subsolar) are near 140 West. These include areas of eastern Turkey and eastern Europe in the east and in eastern Alaska south to British Columbia, Canada in the west. While many areas of the world can be activated by tidal stresses these are the areas which see the strongest tidal stresses with this new moon. Global seismicity is expected to be slightly enhanced during the coming week." (January 22-24, 2020)

 

A moderate quake hit west of this on January 22 and was discussed in the context of today's new moon in previous summaries.

 

"A series of moderate to moderately large earthquakes also occurred today in southeastern Alaska, British Columbia and Turkey. These were probably promoted by the new moon tidal stresses as noted in the previous issue of this summary:

 

The strongest of this activity was in western Turkey where an M 5.6 occurred within several hour of local solar midnight and was probably enhanced by tidal stresses associated with the upcoming new moon. Much of the strongest aftershock activity concentrated near local midnight including an M 4.4 and events of M 4.1 and 4.0. NEIC reported this earthquake of M 5.6 in Western Turkey  was felt with intensity II-III in the area(s) of Western Turkey in Soma (IV); IV in Manisa, Balikesir, Salihli, Odemis and Izmir (IV) and II-III in Akhisar, Menemen, Burhaniye and Edremit, Balikesir, Turkey. The M 5.6 is the strongest earthquake within about 200 km of this epicenter since an M 6.3 on June 12, 2017 and prior to that an M 5.9 on May 19, 2011. A similar M 5.6-5.7 event occurred about 200 km northeast of today's epicenter in the area near Istanbul, Turkey on September 26, 2019." (January 22-23, 2020)

 

At M 6.8 today's event is the strongest in Eastern Turkey within about 250 km

of this epicenter in at least 30 years. The last event in the area of M>=6 was an M 6.1 on March 8, 2010 and prior to that an M 5.8 on March 14, 2005.

Forecasts 121531 and  121290  had expected today's activity within about 50 km was likely at the end of January 2020.             

 

 

O: 24JAN2020 18:36:21  38.3N   38.7E ML=4.1  EMSC   EASTERN TURKEY

O: 24JAN2020 19:03:11  38.3N   38.7E mb=4.6  EMSC   EASTERN TURKEY

O: 24JAN2020 18:43:25  38.3N   39.1E ML=4.3  EMSC   EASTERN TURKEY

O: 25JAN2020 00:57:19  38.3N   39.1E mb=4.0  EMSC   EASTERN TURKEY

O: 24JAN2020 22:01:34  38.3N   39.1E mb=4.1  EMSC   EASTERN TURKEY

O: 25JAN2020 01:02:38  38.3N   39.4E ML=4.0  EMSC   EASTERN TURKEY

O: 24JAN2020 18:32:34  38.4N   39.1E ML=4.2  EMSC   EASTERN TURKEY

O: 25JAN2020 06:07:34  38.4N   39.1E ML=4.4  EMSC   EASTERN TURKEY

O: 24JAN2020 20:42:13  38.4N   39.1E mb=4.2  EMSC   EASTERN TURKEY

O: 24JAN2020 18:08:06  38.4N   39.2E ML=4.5  EMSC   EASTERN TURKEY

O: 24JAN2020 19:49:37  38.4N   39.2E ML=4.5  EMSC   EASTERN TURKEY

O: 24JAN2020 17:55:14  38.4N   39.2E Mw=6.8  EMSC   EASTERN TURKEY

O: 25JAN2020 00:48:52  38.4N   39.2E mb=4.2  EMSC   EASTERN TURKEY

O: 24JAN2020 20:45:09  38.5N   39.2E mb=4.5  EMSC   EASTERN TURKEY               

P:  1FEB2020 121531    38.0N   39.0E 3.5-4.8 CAAAA  Turkey                     

P: 16JAN2020 121290    39.0N   40.0E 3.5-4.8 CAAAA  Turkey                     

 

A moderate earthquake of M 4.6 also occurred today near Barstow, California. NEIC reported maximum intensity IV in California at Lucerne Valley, and Barstow and II-III in Daggett, Newberry Springs, Fort Irwin, Helendale, Apple Valley, Boron, Edwards and Victorville among others. It was felt in Nevada, California and Arizona within about 200 km of the epicenter. It was followed by several felt aftershocks. This epicenter is located north of eastern Los Angeles and may be part of the seismicity noted in this summary in previous issues associated with renewed strong activity in New Guinea. The epicenter is located at 103 degrees from the earlier M 6.8 in eastern Turkey, however and this is a more likely triggering source at this time.  This is the strongest non-aftershock of Ridgecrest within about 100 km of this epicenter since an M 5.1 on November 16, 2009. Forecast 121520 had expected today's moderate quake was likely within about 10 km of this epicenter around January 26.

 

O: 25JAN2020 03:26:35  35.1N  117.0W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 25JAN2020 03:09:43  35.1N  117.0W ML=2.9  EMSC   SOUTHERN CALIFORNIA

O: 25JAN2020 03:08:31  35.1N  117.0W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 25JAN2020 03:03:34  35.1N  117.0W Mw=4.7  EMSC   SOUTHERN CALIFORNIA          

P: 26JAN2020 121520    35.1N  117.0W 2.5-4.4 AAAAA  So. California             

 

An earthquake of M 4.5 also occurred today west of Washington State and British Columbia. NEIC reported maximum intensity III in British Columbia at Ucluelet, Port Alberni, Lake Cowichan, Sooke, Parksville and Duncan and in Washington at Sekiu, Clallam, Beaver, Forks. This epicenter is near the longitude of maximum tidal stress for this new moon and, like the earthquakes in Turkey was probably enhanced by those stresses. This is an unusual epicenter and the event occurred within an hour of local solar noon, suggesting the influence of tidal stresses with the new moon. Today's event is the strongest within about 200 km of this epicenter since an M 4.9 on December 30, 2015 about 200 km east of today's epicenter and M 4.8 within about 100 km on January 8, 2015. Forecast 121571 had expected today's activity in this area was likely around January 25. This epicenter is located at the fourth node (90 degrees) from the M 6.8 in Turkay and may have been promoted by energy from that source.

 

O: 24JAN2020 21:35:29  48.6N  125.1W Mw=4.5  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 24JAN2020 21:35:30  48.6N  125.2W MB=4.5  ECAN Bamfield, BC    

P: 25JAN2020 121571    48.0N  123.0W 2.0-3.8 AABAA  Washington state, U.S.     

MODERATE DEEP FOCUS QUAKE IN ARGENTINA

 

EARTHQUAKE SUMMARY FOR JANUARY 23, 2020

 

The strongest earthquake in the world today was an M 5.5 deep focus event in the area of Santiago del Estero, Argentina. This is probably an aftershock of an M 6.0 which occurred at this epicenter on December 24, 2019. Earthquakes of M 5.5-5.6 also hit about 100 km south of this on March 1, 2019 and July 20, 2018. Forecasts 121371 and 121617 had expected today's activity within about 50 km of this epicenter around January 25.

 

O: 23JAN2020 21:11:28  27.0S   63.4W Mw=5.5  EMSC   SANTIAGO DEL ESTERO, ARGENTINA

P: 22JAN2020 121371    27.0S   63.0W 4.0-5.3 AAAAA  Argentina                  

P: 25JAN2020 121617    27.0S   63.0W 4.0-5.3 AAAAA  Argentina                  

 

An earthquake of M 5.4 also occurred in southern Peru today. NEIC reported this earthquake of M 5.4 in Southern Peru  was felt with intensity II-III in the area(s) of Southern Peru at Ilo, Mollendo, Arequipa and Iquique, Tarapaca, Chile and IV in Moquegua, Tacna, Arequipa and Arica and V in Yunguyo, Puno, Peru.  The last earthquake of M>=5.4 within about 150 km of today's epicenter was an M 6.0 about 100 km to the south on December 3, 2019 and prior to that an M 6.3 on January 21, 2018. Forecast 121613 had expected activity in this area was likely around January 24.

 

O: 24JAN2020 05:13:49  17.5S   70.9W Mw=5.4  EMSC   SOUTHERN PERU                

P: 24JAN2020 121613    16.0S   71.0W 4.0-5.4 ABAAA  So. Peru/Bolivia           

 

The strongest activity in the U.S. or Canada today occurred as moderate aftershocks of the M 6.2 in western Andreanof Islands. The strongest of these were M 4.3. They were not reported felt in this remote area. Forecast 121575 had expected today's activity was likely around January 24. The mainshock of M 6.2 was reported in this summary in the previous issue as:

 

"The M 6.2 is the strongest earthquake within about 200 km of this epicenter since an M 6.3 on November 24, 2019 about 200 km to the east and an M 6.3 on August 23, 2018 about 50 km south of today's epicenter." (January 22-23, 2020)

 

 

O: 24JAN2020 03:35:56  51.7N  177.9W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 23JAN2020 11:06:39  51.8N  177.8W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 23JAN2020 07:54:36  51.9N  177.7W mb=4.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 23JAN2020 13:28:30  51.9N  177.8W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 23JAN2020 08:11:08  51.9N  177.9W mb=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 23JAN2020 11:01:20  51.9N  177.9W mb=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 24JAN2020 00:46:38  51.7N  177.7W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24JAN2020 121575    51.0N  179.1W 3.5-4.8 AAAAA  Andreanoff Isls, Aleutians 

 

 

M 6.2 IN ANDREANOF ISLANDS; TIDAL TRIGGERING IN TURKEY

 

EARTHQUAKE SUMMARY FOR JANUARY 22, 2020

 

The strongest earthquake in the U.S. or Canada today was an M 6.2 in the western Andreanof Islands, Aleutians, Alaska. It was reported with intensity IV in Adak, Alaska. The mainshock was followed by at least 10 moderate aftershocks.  The M 6.2 is the strongest earthquake within about 200 km of this epicenter since an M 6.3 on November 24, 2019 about 200 km to the east and an M 6.3 on August 23, 2018 about 50 km south of today's epicenter.  Forecast 121328 had expected today's activity was likely around January 17. Recent activity in the area had been noted in this summary in previous issues as:

 

"The strongest earthquakes in the U.S. or Canada today continued in the western Andreanof Islands, Aleutians, Alaska. These events of M 4.5 and 4.7 were not reported felt in this remote area. They are part of a series of events in this area in the past several days. This included events of M 5.2 on January 1 and of M 4.9 on January 5, 2020 but are the strongest in the area in the past two weeks. Forecast 121328 had expected today's activity around January 17 within about 100 km of these epicenters." (January 21-22, 2020)

 

O: 22JAN2020 10:11:15  50.4N  180.0E mb=4.1  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 22JAN2020 10:52:31  50.8N  179.9W mb=3.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 22JAN2020 16:35:57  51.0N  179.9W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 22JAN2020 13:09:08  51.1N  179.8W mb=4.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 23JAN2020 06:44:30  51.8N  177.8W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 22JAN2020 14:44:13  51.8N  177.8W ml=3.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 23JAN2020 06:49:42  51.8N  177.9W mb=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 23JAN2020 06:45:36  51.8N  177.9W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 23JAN2020 06:23:55  51.9N  177.9W mb=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 23JAN2020 05:53:03  52.0N  177.7W Mw=6.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 17JAN2020 121328    52.3N  178.5W 3.5-4.8 CAAAA  Andreanoff Isls, Aleutians 

 

A series of moderate to moderately large earthquakes also occurred today in southeastern Alaska, British Columbia and Turkey. These were probably promoted by the new moon tidal stresses as noted in the previous issue of this summary:

 

"The New Moon will arrive on January 24, 2020 at 21:42 UT. Longitudes which are at local solar midnight at this time are near 40 East while those which are at local solar noon (subsolar) are near 140 West. These include areas of eastern Turkey and eastern Europe in the east and in eastern Alaska south to British Columbia, Canada in the west. While many areas of the world can be activated by tidal stresses these are the areas which see the strongest tidal stresses with this new moon. Global seismicity is expected to be slightly enhanced during the coming week." (January 21-23. 2020)

 

The strongest of this activity was in western Turkey where an M 5.6 occurred within several hour of local solar midnight and was probably enhanced by tidal stresses associated with the upcoming new moon. Much of the strongest aftershock activity concentrated near local midnight including an M 4.4 and events of M 4.1 and 4.0. NEIC reported this earthquake of M 5.6 in Western Turkey  was felt with intensity II-III in the area(s) of Western Turkey in Soma (IV); IV in Manisa, Balikesir, Salihli, Odemis and Izmir (IV) and II-III in Akhisar, Menemen, Burhaniye and Edremit, Balikesir, Turkey.  The M 5.6 is the strongest earthquake within about 200 km of this epicenter since an M 6.3 on June 12, 2017 and prior to that an M 5.9 on May 19, 2011. A similar M 5.6-5.7 event occurred about 200 km northeast of today's epicenter in the area near Istanbul, Turkey on September 26, 2019.  Forecast 121289 had expected today's activity within about 25 km of the epicenter was likely around January 20.

 

O: 22JAN2020 14:46:31  38.9N   27.3E ML=4.0  EMSC   WESTERN TURKEY

O: 22JAN2020 21:30:11  39.0N   27.8E ML=4.2  EMSC   WESTERN TURKEY

O: 22JAN2020 22:39:18  39.0N   27.9E ML=4.4  EMSC   WESTERN TURKEY

O: 23JAN2020 00:45:23  39.0N   27.9E ML=4.4  EMSC   WESTERN TURKEY

O: 22JAN2020 19:48:30  39.1N   27.8E ML=4.3  EMSC   WESTERN TURKEY

O: 22JAN2020 20:17:38  39.1N   27.8E ML=4.7  EMSC   WESTERN TURKEY

O: 22JAN2020 19:22:16  39.1N   27.8E Mw=5.6  EMSC   WESTERN TURKEY

O: 22JAN2020 21:52:05  39.1N   27.9E ML=4.0  EMSC   WESTERN TURKEY

O: 22JAN2020 21:24:07  39.1N   27.9E ML=4.1  EMSC   WESTERN TURKEY

O: 22JAN2020 19:25:13  39.1N   27.9E ML=4.5  EMSC   WESTERN TURKEY               

P: 20JAN2020 121289    39.0N   28.0E 3.5-4.8 AAAAA  Turkey                     

 

A series of moderate quakes in Southern and Southeastern Alaska near Yakutat and Sitka of M 4.0 and M 4.3 today was probably triggered by high tidal stresses associated with the new moon as noted in the tidal forecast above.  These occurred within about 5 degrees longitude of 140 West longitude, the expected high stress longitude with this new moon. The first of these was an M 3.9 near

Sitka which occurred within about an hour of local solar midnight when such stresses are maximized. The M 4.2-4.3 in southern Alaska near Yakutat was the strongest within about 100 km of that epicenter since an M 4.5 on September 8, 2019 and prior to that an M 4.7 on March 11, 2019.  Forecasts 121340 and 121329 had expected this activity in mid-January.

 

O: 22JAN2020 14:10:08  60.3N  141.5W mb=4.3  EMSC   SOUTHERN ALASKA              

O: 22JAN2020 14:10:09  60.3N  141.4W MB=4.2  ECAN Yakutat, AK    

P: 22JAN2020 121340    59.0N  137.0W 3.0-4.3 ABBAA  Southeast Alaska           

 

O: 22JAN2020 15:26:19  55.4N  136.8W ML=4.0  EMSC   OFF COAST OF SOUTHEASTERN ALAS

O: 22JAN2020 15:26:19  55.4N  136.8W MB=4.0  ECAN Sitka, AK    

O: 22JAN2020 08:12:48  54.0N  138.1W MB=3.9  ECAN Sitka, AK    

P: 15JAN2020 121329    54.0N  134.0W 3.0-4.8 CBBAA  British Colombia           

 

One aftershock of M>=4 occurred in Puerto Rico today - the second straight day of reduced seismicity in that region. It is likely that damaging aftershocks will not reemerge for a while in this region.

 

O: 22JAN2020 09:37:09  18.0N   66.9W ML=4.2  EMSC   PUERTO RICO                  

P: 22JAN2020 121228    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

LIGHT EARTHQUAKE FELT IN NORTHRIDGE; SAN FERNANDO; LOS ANGELES, CALIFORNIA

 

EARTHQUAKE SUMMARY FOR JANUARY 21, 2020

 

An earthquake of M 3.6 was widely felt in western Los Angeles, California today. NEIC reported maximum intensity IV in San Fernando and Mission Hills, California and II-III in Granada Hills, Newhall, North Hills, Northridge, Pacoima, and Panorma, Califoria among other commumities within about 60 km of the epicenter. This area had been expected to be active at this as noted after the M 6.1 in New Guinea two days ago as:

 

 

"The strongest earthquake in the world today was an M 6.0-6.1 in northern New Guinea. NEIC reported it was felt with intensity IV in Aberpura, Papua New Guinea, Indonesia. Strong earthquakes in this area can affect seismicity in the Los Angeles area of California as it is located at 103 degrees from this. Major quakes in New Guinea are often followed by moderate to strong quakes in southern California about a month later. Major quakes in California often occur in January and February (for example San Fernando - February 9, 1971 and Northridge - January 16, 1994). Today's event is not large enough to trigger this large an event but may be precursory to larger regional events in New Guinea." (January 19, 2020)

 

and

 

"An earthquake of M 2.6 in southern California near Grapevine followed the New Guinea quake of M 6.1 about 37 minutes after that event. This region of Southern California has been hypothesized by some to be the likely site of the next Northridge type event in the region. The SS- and SSS-phases from New Guinea were in the area when this event occurred and may have helped trigger it. This summary has noted the tendency for Northridge-type events in the region to recur with intervent times around 23-26 years. This includes an M 6.7 on December 25, 1899; an M 6.3 on July 23, 1923; an M 6.3 on March 15, 1946; an M 6.7 on February 9, 1971 and the Northridge event of M 6.7 on January 17, 1994. As it has been 26 years since the Northridge quake, such an event may be past due. The effect of the M 7.1 in Ridgecrest, California of July 6, 2019, however, on the seismicity of the Los Angeles area is uncertain and could delay or encourage this coming event." (January 19, 2020)

 

The M 3.6 today near Granada Hills, California is the strongest event within about 50 km of this epicenter since an M 3.6 on September 19, 2017 but the last of larger magnitude was an M 3.8 five years ago on May 3, 2015 which followed an M 4.2-4.3 on January 4, 2015. Forecast 121278 had expected today's activity was likely to the east around January 18.

 

O: 22JAN2020 07:41:10  34.3N  118.5W ml=3.6  ANSS   Granada Hills CA

P: 18JAN2020 121278    34.2N  117.8W 2.5-4.4 BAAAA  So. California             

 

 

The strongest earthquakes in the U.S. or Canada today continued in the western Andreanof Islands, Aleutians, Alaska. These events of M 4.5 and 4.7 were not reported felt in this remote area. They are part of a series of events in this area in the past several days. This included events of M 5.2 on January 1 and of M 4.9 on January 5, 2020 but are the strongest in the area in the past two weeks. Forecast 121328 had expected today's activity around January 17 within about 100 km of these epicenters.

 

O: 22JAN2020 06:07:21  51.0N  179.8W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 22JAN2020 05:35:15  51.1N  179.9W mb=4.5  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 17JAN2020 121328    52.3N  178.5W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

The strongest earthquake felt in the world today was an M 5.3 in Costa Rica. It was followed by a series of aftershocks including an M 5.0.  NEIC reported this earthquake of M 5.3 in Costa Rica  was felt with intensity II-III in the area(s) of Costa Rica at Quepos, Palmares, San Isidro, Parrita, Jaco, Concepcion, Guadalupe, San Jose, Colima, Asuncion and Heredia. It was followed by an M 5.0 aftershock felt in the same area. The M 5.3 is the strongest earthquake in Costa Rica within about 200 km of today's epicenter since an M 6.1 on May 12, 2019 and prior to that an M 5.4 on November 9, 2019. Forecast 121210 had expected today's activity to the north within about 100 km of these epicenters was likely around January 20.

 

O: 21JAN2020 09:39:30   9.0N   84.1W ML=4.0  EMSC   OFF COAST OF COSTA RICA

O: 21JAN2020 11:02:30   9.0N   84.1W ML=4.3  EMSC   COSTA RICA

O: 21JAN2020 09:33:55   9.1N   84.0W Mw=5.3  EMSC   COSTA RICA

O: 21JAN2020 11:25:36   9.1N   84.1W mb=5.0  EMSC   COSTA RICA

O: 21JAN2020 14:43:30   8.9N   84.1W ML=4.0  EMSC   OFF COAST OF COSTA RICA      

P: 20JAN2020 121210    10.0N   84.0W 3.5-5.0 AAAAA  Caribbean Sea              

 

An M 5.3-5.5 earthquake was also felt in Fiji today.  NEIC reported this earthquake of M 5.5 in northern Fiji  was felt with intensity II-III in the area(s) of northern Fiji with IV at Savusavu, and II-III in Western Fiji at Rakiraki, Lautoka and Nadi. This is the strongest earthquake in northern Fiji within about 200 km of this epicenter since an M 5.7 and 6.0 on December 6, 2019 and prior to that an M 6.2 on March 10, 2019. Forecast 121362 had expected regional activity around January 19. It may have been promoted by Tropical Cyclone Tino which passed through the area two days ago as noted in this summary at the time:

 

"TC Tino continued today in the region of Samoa and Tonga with winds up to 80 kts. It is expected to track to the southeast over the next several days. Seismicity in northern Tonga and Fiji will probably be elevated while this storm is in the area." (January 18, 2020)

 

O: 22JAN2020 00:57:21  16.5S  177.8E mb=5.5  EMSC   FIJI                          

P: 19JAN2020 121362    14.0S  172.0E 4.0-5.4 BCCAA  Fiji Islands               

 

It was a relatively quiet day in Puerto Rico today. For the first time since the M 6.5 on January 7, 2020 no events of M>=4 were recorded. The strongest quake in the region today was an M 3.4.

 

O: 21JAN2020 13:29:54  17.9N   66.9W ML=3.0  EMSC   PUERTO RICO REGION

O: 22JAN2020 02:23:32  17.9N   66.9W Md=3.4  EMSC   PUERTO RICO REGION

O: 22JAN2020 04:57:45  18.0N   66.7W Md=3.1  EMSC   PUERTO RICO REGION

O: 21JAN2020 10:24:23  18.0N   66.8W ML=3.1  EMSC   PUERTO RICO REGION

O: 22JAN2020 00:48:43  18.0N   66.8W ML=3.3  EMSC   PUERTO RICO REGION

O: 21JAN2020 08:32:26  18.0N   66.8W ML=3.4  EMSC   PUERTO RICO REGION

O: 21JAN2020 17:36:24  18.1N   66.8W ML=3.1  EMSC   PUERTO RICO

O: 21JAN2020 07:58:01  17.7N   66.9W ML=3.4  EMSC   PUERTO RICO REGION           

P: 22JAN2020 121228    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

EASTERN U.S. CONTINUES TO SEE UNUSUAL SEISMICITY

 

EARTHQUAKE SUMMARY FOR JANUARY 20, 2020

 

An earthquake of M 3.8 occurred today in eastern Tennessee. NEIC reported maximum intensity IV in Tennessee at Duff, La Follette, Claiffield, Jacksboro, Jellico, Speedwell, Newcomb and Andersonville with intensity III in Sharps Chapel and Frakes, Kentucky among others. It was also felt as far as Mayland, Mississippi, Michigan Missouri, Illinois and Pennyslvania and throughout much of the southeastern U.S. It was preceded by an M 2.5 about 2.5 hours earlier southwest of this epicenter and followed by an M 2.3 in Virginia several hours later. The last earthquake in Tennessee of M>=3.8 within about 150 km of today's

epicenter occurred on  December 12, 2018 with M 4.4 and prior to that on November 10, 2012 (M 4.2). These earthquakes were expected in mid-January in forecasts 121258 and 121285. This and the earthquake of M 4.5 in Kansas yesterday suggest that an episode of harmonic resonance may be in progress in the North American plate. This could include an up-coming moderate earthquake on the western edge of the plate in the near future.

 

O: 20JAN2020 19:12:12  36.4N   84.0W Mw=3.8  EMSC   EASTERN TENNESSEE            

P: 15JAN2020 121258    35.0N   83.0W 2.0-3.9 BBAAA  Kentucky/Tennessee/NC      

 

O: 20JAN2020 16:45:47  35.9N   85.6W mb=2.5  EMSC   TENNESSEE                    

P: 13JAN2020 121285    34.0N   85.0W 2.0-4.2 CBAAA  Southeast U.S.             

P: 15JAN2020 121258    35.0N   83.0W 2.0-3.9 BABAA  Kentucky/Tennessee/NC      

 

O: 20JAN2020 23:02:53  37.1N   80.9W Md=2.3  EMSC   VIRGINIA                     

P: 10JAN2020 121049    37.0N   83.0W 2.0-3.8 CABAA  Kentucky/Tennessee/NC      

 

 

The strongest earthquakes in the U.S. and Canada occurred today in the Andreanof Islands. These events of M 4.4, 4.0 and 4.0 were not reported felt in this remote area. The M 4.4 follows a larger event which occurred in this area on January 17 and is an aftershock of that event.  Forecast 121328 had expected activity in the Andreanof Islands in mid-January.

 

O: 20JAN2020 16:01:59  51.6N  175.2W mb=4.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 16JAN2020 121328    51.8N  173.3W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

O: 20JAN2020 22:07:54  51.2N  178.1W ml=4.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 21JAN2020 03:26:41  51.6N  178.0W ml=4.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 17JAN2020 121328    52.3N  178.5W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

An M 4.0 also occurred in the Queen Charlotte Islands region of Canada today.

NEIC reported this earthquake of M 4.0 in Queen Charlotte Island, Canada  was felt with intensity II-III in the area(s) of Queen Charlotte Island, Canada at Kitimat, Victoria and Abbotsford, British Columbia. The last event of M>=4 in this region was an M 4.2 on November 9, 2019 and prior to that an M 4.0 on June 2, 2018. Forecast 121329 had expected today's event was likely within about 150 km of this epicenter in mid-January.

 

O: 21JAN2020 05:51:27  52.8N  132.3W mb=4.0  EMSC   QUEEN CHARLOTTE ISLANDS REGION

O: 20JAN2020 07:25:26  53.0N  132.9W MB=3.5  ECAN Village of Queen Charlotte, BC 

O: 20JAN2020 07:25:26  53.0N  132.9W ML=3.5  EMSC   QUEEN CHARLOTTE ISLANDS REGION

P: 15JAN2020 121329    54.0N  134.0W 3.0-4.8 BAAAA  British Colombia            

 

Moderate earthquakes continued to be felt in southern Puerto Rico today. The strongest of these were two of M 4.7 and M 4.8 near Ponce, Puerto Rico. Following is a listing of events of M>=4 in the region today. A more extensive listing of M>=3 events can be found in the "AMERICA" section below. Forecast 121228 had expected continuing aftershocks at this time.

 

O: 20JAN2020 09:36:37  17.9N   66.7W mb=4.8  EMSC   PUERTO RICO REGION

O: 20JAN2020 15:14:52  17.9N   66.8W mb=4.7  EMSC   PUERTO RICO REGION

O: 20JAN2020 09:56:21  18.0N   66.7W mb=4.5  EMSC   PUERTO RICO

O: 20JAN2020 07:11:04  18.0N   66.7W mb=4.5  EMSC   PUERTO RICO REGION

O: 21JAN2020 02:08:00  18.1N   66.7W mb=4.4  EMSC   PUERTO RICO

O: 21JAN2020 05:28:09  18.1N   66.8W mb=4.1  EMSC   PUERTO RICO                  

P: 22JAN2020 121228    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

STRONG QUAKES IN SULAWESI, INDONESIA; XINJIANG, CHINA AND SO. SANDWICH ISLANDS

 

EARTHQUAKE SUMMARY FOR JANUARY 19, 2020

 

Three strong earthquakes occurred in the world today - of M 6.1 in Sulawesi, Indonesia, Southern Xinjiang, China and in the southern South Sandwich Islands.

The M 6.0-6.1 in Sulawesi, Indonesia today was felt with intensity IV in Gorontalo and II-III in Poso, Sulawesi, Ternate, Maluku and Mataram, Indonesia.

This is the strongest earthquake in Sulawesi within about 200 km of this epicenter since an 6.8 on April 12, 2019 and prior to that an M 6.1 on December 17, 2012. Forecast 121186 had expected today's activity was likely in mid-January within this area.

 

O: 19JAN2020 16:58:20   0.0S  123.8E Mw=6.1  EMSC   SULAWESI, INDONESIA          

O: 19JAN2020 12:10:50   0.1S  123.3E ML=4.2  EMSC   SULAWESI, INDONESIA          

P: 14JAN2020 121186     0.0N  123.0E 4.0-5.3 BAAAA  Mindanao, Philippines      

 

An M 6.0 also shook areas of Southern Xinjiang, China today. NEIC reported it was felt with intensity IV in Os and II-III in Pervomayskiy, Almaty, Kazakhstan. This appears to be part of a series in the area which included an M 5.5 two days ago. At the time this summary noted in this regard:

 

 

"The strongest earthquake in the world today was an M 5.5 in Southern Xinjiang, China. NEIC reported this earthquake of M 5.3-5.5 in Southern Xinjiang, China  was felt with intensity II-III in the area(s) of Almaty, Kazakhstan.  The last earthquakes within about 200 km of this epicenter with M>=5.5 occurred September 3, 2018 and August 11, 2011 with M 5.5-5.6. The strongest in the past 30 years in the area was an M 6.4 on August 27, 1998. Forecast 121303 had expected today's event about 200 km to the north of the epicenter was likely around January 20. This epicenter is located at 103 degrees from the M 7.1 in Central California near Ridgecrest of July 6, 2019 and was probably promoted by energy from that source." (January 18, 2020)

 

The last earthquake of M>=6 in the area was an M 6.3 on February 24, 2003. Forecast 121303 had expected today's activity about 100 km to the north was likely around January 20.

 

O: 19JAN2020 13:39:32  39.6N   77.3E mb=4.7  EMSC   SOUTHERN XINJIANG, CHINA

O: 19JAN2020 13:48:40  39.8N   77.1E mb=4.4  EMSC   SOUTHERN XINJIANG, CHINA

O: 19JAN2020 15:49:32  39.8N   77.5E mb=4.7  EMSC   SOUTHERN XINJIANG, CHINA

O: 19JAN2020 13:27:57  39.9N   77.1E Mw=6.0  EMSC   SOUTHERN XINJIANG, CHINA

O: 19JAN2020 13:51:50  39.9N   77.3E mb=4.5  EMSC   SOUTHERN XINJIANG, CHINA

O: 19JAN2020 14:23:03  39.9N   77.4E mb=5.0  EMSC   SOUTHERN XINJIANG, CHINA

O: 19JAN2020 14:55:13  39.9N   77.7E mb=4.8  EMSC   SOUTHERN XINJIANG, CHINA     

P: 20JAN2020 121303    41.0N   77.0E 4.0-5.3 ABAAA  Kirgizstan/Xinjiang        

 

An earthquake of M 6.1 also occurred today in the South Sandwich Islands today.

This is the strongest earthquake in the southern South Sandwich Islands since an M 6.6 on  August 27, 2019 and prior to that an M 6.5 on April 9, 2019. Forecast 121399 had expected this activity within about 100 km of the epicenter was likely around January 22.

 

O: 20JAN2020 06:51:39  59.3S   26.4W Mw=6.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 22JAN2020 121399    60.0S   29.0W 4.0-5.6 AABAA  So. Sandwich Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in Kansas. NEIC reported it was felt with intensity VI in Hutchinson and South Hutchinson, Kansas; V in Kansas at Partridge, Nickerson, Abbyville, Haven, Buhler and II-IV in Pretty Prairie and Bunton, Kansas. It was reported felt throughout most of the central U.S. including as far as Texas, Minnesota, South Carolina, Montana and many other states. Two earthquakes have occurred within about 150 km of this epicenter in the past 30 years - both of M 4.7 on November 19 and 30, 2015. One has occurred in this time frame within  about 100 km of this epicenter - an M 4.8 on November 12, 2014. Forecast 121288 had expected today's earthquake in this area was likely around January 17. While this appears to be part of the general increased seismicity in Oklahoma and Kansas, the enhanced magnitude may indicate precursory activity to a moderate earthquake along the western edge of the North American plate  in the next several weeks. Usually such activity occurs north in the South Dakota and/or Nebraska area but seismicity in the central plains of the U.S. is not at usual levels in the past several years and little in the way of precedent can be found in the regional earthquake history.

 

O: 19JAN2020 19:08:40  38.0N   98.0W Mw=4.5  EMSC   KANSAS                        

P: 17JAN2020 121288    37.0N   99.0W 2.0-3.8 AAAAA  Southern Plains            

 

Moderate earthquakes continued to be felt in southern Puerto Rico today. The strongest of these were two of M 4.7 near Ponce, Puerto Rico. Following is a listing of events of M>=4 in the region today. A more extensive listing of M>=3 events can be found in the "AMERICA" section below. Forecast 121228 had expected continuing aftershocks at this time.

 

O: 19JAN2020 18:45:04  17.9N   66.7W ML=4.1  EMSC   PUERTO RICO REGION

O: 19JAN2020 15:52:19  17.9N   67.0W mb=4.7  EMSC   PUERTO RICO REGION

O: 20JAN2020 05:26:20  18.0N   66.7W Mw=4.7  EMSC   PUERTO RICO

O: 20JAN2020 01:26:05  18.0N   66.7W mb=4.3  EMSC   PUERTO RICO

P: 18JAN2020 121228    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

STRONG QUAKE FELT IN NEW GUINEA MAY AFFECT CALIFORNIA SEISMICITY

 

EARTHQUAKE SUMMARY FOR JANUARY 18, 2020

 

The strongest earthquake in the world today was an M 6.0-6.1 in northern New Guinea. NEIC reported it was felt with intensity IV in Aberpura, Papua New Guinea, Indonesia. Strong earthquakes in this area can affect seismicity in the Los Angeles area of California as it is located at 103 degrees from this. Major quakes in New Guinea are often followed by moderate to strong quakes in southern California about a month later. Major quakes in California often occur in January and February (for example San Fernando - February 9, 1971 and Northridge - January 16, 1994). Today's event is not large enough to trigger this large an event but may be precursory to larger regional events in New Guinea.

 

The M 6.0 in New Guinea was followed a series of moderate aftershocks. The M 6.0

in the strongest within about 200 km of this epicenter since an M 6.1 on June 24 and an M 6.3 on June 19, 2019 several weeks before the M 7.1 in Ridgecrest, California. The last earthquake of significantly larger magnitude in this area of New Guinea was an M 7.0 on July 27, 2015. Forecast 121199 had expected today's event within about 100 km of the epicenter was likely around January 15.

 

O: 19JAN2020 03:25:25   2.7S  139.5E ML=4.1  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O: 18JAN2020 21:33:29   2.7S  139.5E ML=4.3  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O: 18JAN2020 17:08:36   2.7S  139.6E ML=4.3  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O: 18JAN2020 16:38:14   2.8S  139.3E Mw=6.0  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O: 19JAN2020 00:14:41   2.9S  139.3E mb=4.9  EMSC   NEAR N COAST OF PAPUA, INDONES

O: 18JAN2020 16:07:47   3.1S  140.7E ML=4.3  EMSC   PAPUA, INDONESIA             

P: 15JAN2020 121199     3.0S  140.0E 4.0-5.4 BAAAA  Papua New Guinea           

 

An earthquake of M 2.6 in southern California near Grapevine followed the New Guinea quake of M 6.1 about 37 minutes after that event. This region of Southern California has been hypothesized by some to be the likely site of the next Northridge type event in the region. The SS- and SSS-phases from New Guinea were in the area when this event occurred and may have helped trigger it. This summary has noted the tendency for Northridge-type events in the region to recur with intervent times around 23-26 years. This includes an M 6.7 on December 25, 1899; an M 6.3 on July 23, 1923; an M 6.3 on March 15, 1946; an M 6.7 on February 9, 1971 and the Northridge event of M 6.7 on January 17, 1994. As it has been 26 years since the Northridge quake, such an event may be past due. The effect of the M 7.1 in Ridgecrest, California of July 6, 2019, however, on the seismicity of the Los Angeles area is uncertain and could delay or encourage this coming event.

 

The last earthquake within about 50 km of today's event of M 2.5-2.6 in Southern

California was an M 2.7 on January 13, 2020. A series of such events have occurred in the past two weeks including an M 2.9 on January 12, 2020. Forecast 121279 had expected today's event was likely in this area around January 15.

 

NEIC reported this earthquake of M 2.6 in Southern California was felt with intensity II-III in the area(s) of Southern California at Frazier Park, Bakersfield and Moorpark.

  

 

O: 18JAN2020 17:15:13  35.0N  118.9W Ml=2.5  EMSC   CENTRAL CALIFORNIA           

P: 15JAN2020 121279    34.7N  119.0W 2.5-4.3 BAAAA  So. California             

 

Seismicity continued at elevated levels in Puerto Rico today. The strongest aftershock in the region was an M 4.6 today. Forecast 121228 had expected this activity around January 18. Following are the earthquakes of M>=4.0 today with a more extensive listing of M>=3 in the "AMERICA" section below.

 

O: 19JAN2020 00:53:57  17.8N   66.9W Mw=4.0  EMSC   PUERTO RICO REGION

O: 18JAN2020 08:44:35  17.9N   66.7W ML=4.1  EMSC   PUERTO RICO REGION

O: 19JAN2020 03:06:59  17.9N   66.8W ML=4.1  EMSC   PUERTO RICO REGION

O: 19JAN2020 00:05:55  17.9N   66.9W Mw=4.6  EMSC   PUERTO RICO REGION

O: 18JAN2020 16:56:59  17.8N   66.8W ML=4.1  EMSC   PUERTO RICO REGION           

P: 18JAN2020 121228    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

MODERATE QUAKE IN SOUTHERN XINJIANG, CHINA

 

EARTHQUAKE SUMMARY FOR JANUARY 17, 2020

 

The strongest earthquake in the world today was an M 5.5 in Southern Xinjiang, China. NEIC reported this earthquake of M 5.3-5.5 in Southern Xinjiang, China  was felt with intensity II-III in the area(s) of Almaty, Kazakhstan.  The last earthquakes within about 200 km of this epicenter with M>=5.5 occurred September 3, 2018 and August 11, 2011 with M 5.5-5.6. The strongest in the past 30 years in the area was an M 6.4 on August 27, 1998. Forecast 121303 had expected today's event about 200 km to the north of the epicenter was likely around January 20. This epicenter is located at 103 degrees from the M 7.1 in Central California near Ridgecrest of July 6, 2019 and was probably promoted by energy from that source.

 

O: 17JAN2020 16:05:50  39.8N   77.1E mb=5.5  EMSC   SOUTHERN XINJIANG, CHINA     

P: 20JAN2020 121303    41.0N   77.0E 4.0-5.3 BBAAA  Kirgizstan/Xinjiang        

 

The strongest earthquake felt in the U.S. or Canada today was an M 4.1-4.2 in Central Alaska. NEIC reported maximum intensity IV in Cantwell and II-III in Matanuska-Sustina Border, Talkeetna, Glennallen, Healy, Palmer, Chugiak, Wasilla, Willow and Anchorage. The last earthquake within about 100 km of this epicenter with M>=4.1 was an M 4.6 on October 17, 2019 and prior to that an M 4.2 on August 15, 2018. Forecasts 121348 and 121347 had expected today's activity was likely within about 50 km of this epicenter in mid-January.

 

O: 17JAN2020 20:05:43  62.9N  148.2W Mw=4.2  EMSC   CENTRAL ALASKA               

P: 13JAN2020 121348    63.0N  148.6W 3.2-4.9 BAAAA  Central Alaska             

P: 16JAN2020 121347    62.7N  149.3W 3.2-4.8 AAAAA  Central Alaska             

 

An M 4.9 in the Andreanof Islands, Alaska of M 4.9 was also reported felt with intensity III in Adak, Alaska. This is the strongest earthquake within about 100 km of this epicenter since an  M 6.3 on November 24, 2019 and is probably an aftershock of that event. Other such recent events in the area occurred with M 5.0-5.1 on March 7 and February 15, 2019. Forecast 121328 had expected an earthquake in this area was likely around January 16.

 

O: 17JAN2020 14:13:36  51.8N  175.3W mb=4.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 16JAN2020 121328    51.8N  173.3W 3.5-4.8 AABAA  Andreanoff Isls, Aleutians 

 

Moderate aftershocks also continued in Puerto Rico today and were felt in southern Puerto Rico with moderate intensity. The largest of today's events were of M 4.4 and 4.5. Following is a listing of events of M>=4 which occurred today. A more complete listing of events of M>=3 is found in the "AMERICA" section below.  Forecast 121228 had expected this activity was likely around January 18.

 

O: 17JAN2020 22:02:35  17.9N   66.7W mb=4.5  EMSC   PUERTO RICO REGION

O: 18JAN2020 06:59:12  18.0N   66.7W ML=4.2  EMSC   PUERTO RICO

O: 17JAN2020 17:30:51  18.0N   66.7W mb=4.0  EMSC   PUERTO RICO REGION

O: 17JAN2020 10:32:59  18.0N   66.8W mb=4.4  EMSC   PUERTO RICO REGION

O: 17JAN2020 12:52:17  18.0N   67.0W ML=4.1  EMSC   PUERTO RICO

P: 18JAN2020 121228    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

RONG SEISMICITY IN CENTRAL ATLANTIC

 

EARTHQUAKE SUMMARY FOR JANUARY 16, 2020

 

The strongest seismicity in the world today occurred in the central Atlantic. This included an M 4.6 on the mid-Atlantic ridge; an M 5.9 in the Ascension Island region and an M 5.5 north of Ascension Island. None of these events were reported felt. The M 5.9 is the largest earthquake within about 200 km of this epicenter since an M 6.1-6.3 on November 11, 2017 and an M 5.9 on May 2, 2017. These followed a quiet of nearly 20 years at this magnitude in the region after an M 6.3 on June 18, 1998. Forecast 121365 had expected this event in this area was likely around January 14-16.

 

O: 17JAN2020 06:37:52  11.8S   13.8W Mw=5.9  EMSC   ASCENSION ISLAND REGION      

P: 14JAN2020 121365    13.0S   15.0W 4.0-5.4 BBAAA  So. Mid-Atlantic Ridge     

P: 16JAN2020 121365    14.0S   14.0W 4.0-5.4 ACAAA  So. Mid-Atlantic Ridge     

 

The M 5.5 north of Ascension Island is the largest within about 200 km of this epicenter since an M 5.6 on January 6, 2020, the first such event in the area since an M 5.9 on March 10, 2018.  Forecast 121190 had expected activity within this area was likely around January 13.

 

O: 16JAN2020 09:58:18   0.1N   17.1W Mw=5.5  EMSC   NORTH OF ASCENSION ISLAND    

P: 13JAN2020 121190     1.0S   16.0W 4.0-5.4 BBAAA  Central Mid-Atlantic       

 

O: 16JAN2020 12:01:05  20.4N   45.7W mb=4.6  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 18JAN2020 121222    17.0N   47.0W 4.0-5.3 ACAAA  Mid-Atlantic Ridge         

 

A moderate earthquake of M 3.9-4.0 occurred in Utah today. NEIC reported maximum intensity IV in Greenville, Paragonah, Milford, and II-III in Beaver, Cedar City, Monroe, Newcastle, Orderville, Hurricane and Washington. This was the largest earthquake in the U.S. or Canada today. It is the strongest earthquake within about 100 km of this epicenter since an M 4.1 on April 1, 2019 and an M 4.0 on February 20, 2019 and prior to that an M 4.1 on July 4, 2015. Forecast 121291 had expected today's event within about 50 km was likely around January 13.

 

O: 17JAN2020 02:31:11  38.3N  112.9W ML=4.0  EMSC   UTAH                         

O: 17JAN2020 02:31:11  38.3N  112.9W ml=4.0  ANSS   SE of Milford Utah

P: 13JAN2020 121291    38.6N  112.7W 2.0-3.8 BAAAA  Utah area                   

 

A series of earthquake in Kamchatka followed an M 5.3 in that area today. This may be associated with volcanism in the region. The last event in the area of Kamchatka with M>=5.3 occurred as an M 5.4 on July 6, 2018. Forecast 121330 had expected today's activity was likely within about 100 km of this epicenter around January 17. This activity is near 103 degrees from the activity in Puerto Rico and may have been promoted by energy from that source.

 

NEIC reported the earthquake of M 4.8 in Kamchatka  was felt with intensity II-III in the area(s) of Kamchatka at Mohovaja. An earlier M 5.4 was felt with intensity IV in Mohovaja and III in Petropavlovsk and Jelizovo.

 

O: 16JAN2020 16:47:32  52.1N  159.6E mb=4.3  EMSC   OFF EAST COAST OF KAMCHATKA

O: 16JAN2020 16:31:12  52.1N  159.7E Mw=5.3  EMSC   OFF EAST COAST OF KAMCHATKA

O: 17JAN2020 04:00:54  52.1N  159.7E mb=4.5  EMSC   OFF EAST COAST OF KAMCHATKA

O: 16JAN2020 18:03:03  52.1N  159.9E mb=4.2  EMSC   OFF EAST COAST OF KAMCHATKA

O: 16JAN2020 18:13:25  52.2N  159.3E mb=4.6  EMSC   OFF EAST COAST OF KAMCHATKA

O: 16JAN2020 21:51:00  52.2N  159.6E mb=4.8  EMSC   OFF EAST COAST OF KAMCHATKA

O: 16JAN2020 17:05:32  52.3N  159.9E mb=4.1  EMSC   OFF EAST COAST OF KAMCHATKA

O: 16JAN2020 19:19:26  52.0N  159.6E mb=4.6  EMSC   OFF EAST COAST OF KAMCHATKA  

P: 17JAN2020 121330    53.0N  161.0E 4.0-5.3 AAAAA  E. of Kamchatka            

 

An earthquake of M 5.3 also was felt in Southern Xinjiang, China today. NEIC reported this earthquake of M 5.3 in  Southern Xinjiang, China  was felt with intensity II-III in the area(s) of Southern Xinjiang, China at Kuche, Xinjiang (VII).  This is the strongest event within about 200 km of this epicenter in Xinjiang, China since an M 6.3 north of this on June 29, 2012.  Forecast 121303 had expected today's event in this region was likely around January 15.

 

O: 16JAN2020 08:32:38  41.2N   83.7E Mw=5.3  EMSC   SOUTHERN XINJIANG, CHINA     

P: 15JAN2020 121303    42.0N   82.0E 4.0-5.3 AABAA  Kirgizstan/Xinjiang        

 

An earthquake of M 4.1-4.3 also shook areas of southern Italy today. NEIC reported this earthquake of M 4.3  in Southern Italy  was felt with intensity II-III in the area(s) of Southern Italy at Caccuri (V), Calabria; IV in Crotone and II-III in Senastretta and Platania, Calabria. The last earthquake of M>=4.3 within about 100 km of this epicenter was an M 4.5 on October 15, 2019. Forecast 121260 had expected today's event in this area was likely around January 20.

 

O: 16JAN2020 23:37:10  39.1N   16.7E mb=4.3  ANSS   Petilia Policastro Italy

O: 16JAN2020 23:37:10  39.1N   16.7E ML=4.1  EMSC   SOUTHERN ITALY               

P: 20JAN2020 121260    39.0N   15.0E 3.0-4.4 BABAA  Mediterranean/Sicily       

 

The current activation of eastern Mexico continued today with an M 5.3 in Oaxaca, Mexico. It was followed in the next two hours by a strong sequence of moderate aftershocks. NEIC reported the earthquake of M 4.9 in Oaxaca, Mexico  was felt with intensity II-III in the area(s) of Oaxaca, Mexico at Huatulco, Oaxaca, and in Mexico City and Tlalnepantla. The mainshock of M 5.3 was felt in Oaxaca with intensity IV in Juchilan and II-III in Mepec, Santa Maria, Oaxaca, Villahermosa, Xalapa, Momoxpan, Mexico City, Naucalpan and Tlalnepantla.

An M 5.8 hit about 100 km southeast of this on January 5, 2020 but the last within about 100 km was an M 5.8 on January 21, 2019. Forecast 121214 had expected today's activity within about 50 km of this epicenter was likely around January 18. 

 

O: 17JAN2020 04:37:14  16.5N   95.1W ML=4.0  EMSC   OAXACA, MEXICO

O: 17JAN2020 04:52:29  16.5N   95.1W ML=4.0  EMSC   OAXACA, MEXICO

O: 17JAN2020 04:26:38  16.5N   95.1W ML=4.1  EMSC   OAXACA, MEXICO

O: 17JAN2020 02:47:16  16.5N   95.1W ML=4.3  EMSC   OAXACA, MEXICO

O: 17JAN2020 02:18:23  16.5N   95.2W ML=4.3  EMSC   OAXACA, MEXICO

O: 17JAN2020 03:21:43  16.5N   95.3W ML=4.2  EMSC   OAXACA, MEXICO

O: 17JAN2020 02:11:12  16.7N   94.9W mb=4.9  EMSC   OAXACA, MEXICO

O: 17JAN2020 02:07:24  16.7N   95.0W Mw=5.3  EMSC   OAXACA, MEXICO               

P: 18JAN2020 121214    16.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

Aftershocks continued today to be felt in southern Puerto Rico. The strongest of today's events was an M 4.8. Events of M>=4 follow but those of M>=3 are found in the "AMERICA" section below. No damage was reported with today's activity. Forecast 121228 had expected today's activity within about 25 km of these epicenter around January 18.

 

The M 4.8 was reported with intensity V in Puerto Rico at Lajas, Hormigueres and Guayanilla; IV in Ensenada, Guanica, Sabana, Cabo Rojo, San German, Yauco, and Mayaguez among others.

 

O: 16JAN2020 23:38:38  17.9N   66.7W ML=4.1  EMSC   PUERTO RICO REGION

O: 16JAN2020 13:09:57  17.9N   66.8W ML=4.1  EMSC   PUERTO RICO REGION

O: 16JAN2020 20:58:46  18.0N   66.8W mb=4.8  EMSC   PUERTO RICO

P: 18JAN2020 121228    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

MODERATE QUAKE SHAKES TIMOR, INDONESIA; ENHANCED FROM TC CLAUDIA

 

EARTHQUAKE SUMMARY FOR JANUARY 15, 2020

 

The strongest earthquake in the world today was an M 5.5 in the Timor area of

Indonesia. This may have been enhanced by stresses associated with Tropical

Cyclone Claudia as noted in previous issues of this summary:

 

"TC Claudia continued today in the region north of Western Australia with winds up to 50 kts. It is expected to track to the west over the next several days. It will be antipodal to the Haiti and the Dominican Republic today and may help continue aftershocks in that area for the next several days. Seismicity to the north in Indonesia is also expected to be enhanced by stresses from this storm." (January 13-15, 2020)

 

Today's event is the strongest within about 200 km of this epicenter in the Timor region since an M 6.2 and 5.7 on August 28, 2018. An earthquake of M 5.5 hit about 200 km to the northwest of this on June 17, 2019. Forecast 121189 had expected regional seismicity in mid-January.

 

O: 15JAN2020 07:55:30  10.3S  124.1E Mw=5.5  EMSC   TIMOR REGION, INDONESIA      

O: 15JAN2020 12:16:41  10.5S  124.1E mb=4.5  EMSC   TIMOR REGION, INDONESIA      

P: 20JAN2020 121189     6.0S  125.0E 4.0-5.3 BCAAA  Banda Sea                  

 

An M 5.2 shook most of the Island of Puerto Rico today. NEIC reported intensity V in Puerto Rico at Lajas, Hormigueres and Guayanilla; IV in Ensenada, Guanica, Sabana, Cabo Rojo, San German, Yauco, and Mayaguez among others. This is the strongest aftershock in Puerto Rico since the M 5.9 on January 11 and may have been affected by antipodal effects from Tropical Cyclone Claudia off northern Australia as noted in previous issues of this report. Forecast 121228 had expected continuing aftershocks in Puerto Rico in mid-January. Following is a listing of aftershocks of M>=4 today in the region of Puerto Rico. A more extensive listing can be found in the "AMERICA" section below.

 

O: 15JAN2020 20:00:39  17.8N   66.9W ML=4.2  EMSC   PUERTO RICO REGION

O: 15JAN2020 20:27:51  17.8N   66.9W mb=4.3  EMSC   PUERTO RICO REGION

O: 16JAN2020 02:51:21  17.8N   67.1W Mw=4.5  EMSC   PUERTO RICO REGION

O: 15JAN2020 21:08:04  17.9N   66.8W mb=4.2  EMSC   PUERTO RICO REGION

O: 15JAN2020 15:36:24  17.9N   66.9W Mw=5.2  EMSC   PUERTO RICO REGION

O: 15JAN2020 19:49:47  17.9N   66.9W mb=4.4  EMSC   PUERTO RICO REGION

P: 18JAN2020 121228    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

An unusually large M 5.2 also hit the region of Oaxaca, Mexico today. NEIC reported this earthquake of M 5.2 in Oaxaca, Mexico  was felt with intensity II-III in the area(s) of Oaxaca, Mexico at Puerto Escondido, Oaxaca. It was followed by a strong aftershock series. This sequence began with an M 4.7 near local solar midnight and may have been enhanced by tidal stresses which maximize near this hour. The last earthquake in Oaxaca within about 150 km of this epicenter with M>=5.2 occurred April 22, 2019 (M 5.4). A major quake of M 7.2 hit the region two years ago on February 16, 2018 and these are probably aftershocks of that event. Annual seismic enhancement such as this may be due to recurring weather patterns. Forecast 121227 had expected today's earthquake within about 50 km was likely around January 15.

 

 

O: 15JAN2020 08:38:56  16.2N   98.1W ML=4.0  EMSC   OAXACA, MEXICO

O: 15JAN2020 09:27:24  16.2N   98.1W ML=4.1  EMSC   OAXACA, MEXICO

O: 15JAN2020 14:42:35  16.3N   98.0W ML=3.5  EMSC   OAXACA, MEXICO

O: 15JAN2020 14:47:33  16.3N   98.1W ML=4.2  EMSC   OAXACA, MEXICO

O: 15JAN2020 07:44:37  16.4N   97.8W mb=4.7  EMSC   OAXACA, MEXICO

O: 15JAN2020 08:15:28  16.5N   97.9W mb=5.2  EMSC   OAXACA, MEXICO               

P: 15JAN2020 121227    16.0N   98.0W 3.5-5.0 AAAAA  Oaxaca, Mexico             

 

 

The most unusual earthquake in the U.S. or Canada today was an M 2.6 in South Carolina. The last earthquakes of M>=2.6 within about 100 km of this epicenter occurred as an M 2.6 on September 13, 2018 and an M 4.1 and aftershock of M 3.2 on February 15-16, 2014. Forecast 121258 had expected today's activity to the northwest around January 15.

 

O: 15JAN2020 09:52:31  34.5N   80.5W mb=2.6  EMSC   SOUTH CAROLINA               

P: 15JAN2020 121258    35.0N   83.0W 2.0-3.9 AACAA  Kentucky/Tennessee/NC      

 

Seismicity at Taal Volcano in central Philippines was down today. Only two light to moderate quakes were recorded (M 3.6 and 4.0). This quiet period may indicate a blockage in the piping which, if released could lead to a major  eruption. It may also indicate a relaxation period until a further external forcing factor such as a strong geomagnetic storm, meteorologial storm or new moon combine with local stresses to set off the next round of volcanism in the area.

 

O: 15JAN2020 07:15:32  13.9N  120.8E ML=3.6  EMSC   MINDORO, PHILIPPINES         

O: 15JAN2020 11:34:59  14.1N  121.1E ML=4.0  EMSC   LUZON, PHILIPPINES           

P: 15JAN2020 121220    14.0N  121.0E 3.5-4.8 AAAAA  Luzon, Philippines         

 

CARIBBEAN REMAINS ACTIVE

 

EARTHQUAKE SUMMARY FOR JANUARY 14, 2020

 

Moderate aftershocks continued to be felt widely in southern Puerto Rico today but no damaging or large quakes were recorded. These follow events of M 6.5 on January 7 and M 6.0 on January 10 which did considerable damage in the area and left many without power. A state of emergency may be called to help with reconstruction. These were accompanied by unusual activity in the Dominican Republic and Dominica. The strongest of today's events was M 4.9. The area is still assessing the damage from the M 5.9-6.0 of January 11. Considerable additional damage occurred with this aftershock. This included loss of water and power as well as landslides. Many people have chosen to live in tents for fear of additional damaging aftershocks throughout the island. Earthquakes today were felt with maximum intensity VI in Puerto Rico at Guayanilla; IV in Ponce, Adjuntas, Sabanad, Jayuya, and II-III in Coto Laurel, Utuado and Lajas, among others throughout the island. Following is a listing of aftershocks today in Puerto Rico of M>=4. Those of M>=3 are listed in the "AMERICA" Section below. Forecast 120119 had expected continuing moderate aftershocks in the region at this time.

 

O: 14JAN2020 16:44:19  17.8N   66.8W ML=4.2  EMSC   PUERTO RICO REGION

O: 14JAN2020 22:27:42  17.8N   66.8W Mw=4.3  EMSC   PUERTO RICO REGION

O: 14JAN2020 12:37:21  17.8N   66.8W mb=4.1  EMSC   PUERTO RICO REGION

O: 14JAN2020 12:26:41  17.8N   66.8W mb=4.9  EMSC   PUERTO RICO REGION

O: 14JAN2020 08:07:03  17.9N   66.7W ML=4.1  EMSC   PUERTO RICO REGION

O: 14JAN2020 14:02:18  17.9N   66.8W ML=4.0  EMSC   PUERTO RICO REGION

O: 15JAN2020 06:34:13  18.0N   66.7W ML=4.0  EMSC   PUERTO RICO

O: 14JAN2020 14:48:09  18.0N   67.0W mb=4.6  EMSC   PUERTO RICO

O: 14JAN2020 16:03:53  17.8N   66.8W ML=4.1  EMSC   PUERTO RICO REGION           

P: 14JAN2020 121228    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

 

A series of light earthquakes also occurred in northern Dominican Republic today with events of M 3.0-3.5. This activity is located at the antipode of Tropical Cyclone Claudia and may have been promoted by antipodal effects from that storm as noted in previous issues of this summary:

 

"TC Claudia continued today in the region north of Western Australia with winds up to 50 kts. It is expected to track to the west over the next several days. It will be antipodal to the Haiti and the Dominican Republic today and may help continue aftershocks in that area for the next several days. Seismicity to the north in Indonesia is also expected to be enhanced by stresses from this storm." (January 13-15, 2020)

 

The last significant activity in this region of the Dominican Republic was an M 5.2 on September 23, 2018 and an M 5.1 on January 23, 2012 and prior to that an M 4.9 on September 4, 2004. Forecast 121229 had expected activity in this area around January 17.

 

O: 14JAN2020 17:40:50  19.8N   71.1W ML=3.3  EMSC   DOMINICAN REPUBLIC           

O: 14JAN2020 17:58:05  19.8N   71.2W ML=3.1  EMSC   DOMINICAN REPUBLIC           

P: 17JAN2020 121229    18.0N   71.0W 3.4-4.8 BBAAA  Puerto Rico                

 

O: 14JAN2020 11:58:01  19.4N   69.9W ML=3.4  EMSC   DOMINICAN REPUBLIC           

P: 16JAN2020 121229    18.0N   69.0W 3.4-4.8 ABAAA  Puerto Rico                 

 

A moderate M 4.8 also occurred in the eastern Caribbean in the Leeward Islands at Dominica. A similar event of M 5.1 hit the region on  January 8, 2020. This is probably an aftershock of that event. This summary had noted at the time:

 

"An earthquake of M 5.1 occurred today in the Leeward Islands of the eastern Caribbean today. NEIC reported it was felt with maximum intensity IV in La Francis Le Marin, Martinique and II-III in Martinique at Le Morne-Rouge, Saint-Pierre and Le Robert La Trinite.  It is likely that energy from the M 6.5 in Puerto Rico of January 7 helped promoted this earthquake at this time. This is the strongest earthquake in the Leeward Islands since an M 5.4 on September 28, 2018 and prior to that on February 3, 2017. Forecast 121011 had expected today's activity was likely in the Leeward Islands around January 6." (January 8-9, 2020)

 

O: 15JAN2020 00:17:06  15.2N   61.2W mb=4.8  EMSC   DOMINICA REGION, LEEWARD ISLAN

P: 15JAN2020 121219    17.0N   60.0W 3.0-5.1 ABAAA  Leeward Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in Central Alaska. NEIC reported this earthquake of M 3.7 in Central Alaska  was felt with intensity II-III in the area(s) of Central Alaska at Fairbanks, Fort Wainwright, North Pole, Eielson, Healy, Stevens Village and Clear (VI).  The last earthquake of M>=4 within about 150 km of this epicenter occurred on September 25, 2019 with M 4.0, the last of larger magnitude was an M 4.4 on April 11, 2019. Forecast 121348 had expected today's activity in this area around January 13.

 

O: 14JAN2020 20:46:56  64.7N  148.5W ML=4.0  EMSC   CENTRAL ALASKA               

P: 13JAN2020 121348    63.0N  148.6W 3.2-4.9 ABAAA  Central Alaska             

 

Moderate earthquakes also continued today near Taal Volcano about 40 miles south of Manila, Philippines. While a strong eruption, bigger than any in the past 40 years, is possible, it may be delayed until the next new moon of January 24 or the next strong geomagnetic storm. Taal is located on the geomagnetic equator and the current eruption began with the geomagnetic storm of January 9-10, but was also coincident with the Full moon, both of which may have helped promote the initial eruption. Forecast 121220 had expected this activity around January 15.

 

O: 14JAN2020 17:32:03  13.9N  120.9E ML=3.6  EMSC   MINDORO, PHILIPPINES

O: 14JAN2020 19:19:07  13.9N  120.9E ML=3.7  EMSC   MINDORO, PHILIPPINES

O: 14JAN2020 07:38:32  14.0N  120.8E ML=3.5  EMSC   LUZON, PHILIPPINES

O: 14JAN2020 08:36:31  14.0N  120.8E ML=4.1  EMSC   MINDORO, PHILIPPINES

O: 15JAN2020 04:19:27  14.0N  120.9E ML=3.6  EMSC   LUZON, PHILIPPINES

O: 14JAN2020 14:00:32  14.0N  121.0E ML=3.6  EMSC   LUZON, PHILIPPINES

O: 15JAN2020 00:34:11  14.1N  120.9E ML=3.6  EMSC   LUZON, PHILIPPINES

O: 14JAN2020 07:31:28  14.1N  120.9E ML=3.8  EMSC   LUZON, PHILIPPINES

O: 14JAN2020 20:02:09  13.8N  120.9E ML=3.8  EMSC   MINDORO, PHILIPPINES         

P: 15JAN2020 121220    14.0N  121.0E 3.5-4.8 AAAAA  Luzon, Philippines         

 

 

Light earthquakes of M 2.5 and 2.7 occurred today in the region near New South Wales, Australia. Strong wildfires have been occurring in this region, but strong rains came with this seismicity today and have removed some of the danger for the immediate time. This seismicity may be related to stresses from these storms.

 

O: 15JAN2020 01:02:03  32.4S  151.1E ML=2.5  EMSC   NEAR S.E. COAST OF AUSTRALIA 

O: 15JAN2020 01:55:44  32.5S  151.1E ML=2.7  EMSC   NEAR S.E. COAST OF AUSTRALIA 

 

The strongest earthquake in the world today was an M 5.3 south of the Fiji Islands. It was not reported felt in this area. It is the strongest quake in this region since an M 5.3 on December 28, 2019 about 300 km northeast of this epicenter.  Forecast 121381 had expected this earthquake within about 25 km was likely around January 16.

 

O: 15JAN2020 00:14:19  23.7S  180.0W mb=5.3  EMSC   SOUTH OF FIJI ISLANDS        

P: 16JAN2020 121381    24.0S  180.0W 4.0-5.3 AAAAA  Tonga Islands              

 

MODERATE QUAKES IN POLAND; NEW YORK-CANADA BORDER

 

EARTHQUAKE SUMMARY FOR JANUARY 13, 2020

 

A moderate M 3.9-4.2 shook regions of Poland today. NEIC reported maximum intensity V in Rybnik; IV in Katowice and II-III in Tychy, Gliwice, Ledziny and Wroclaw, Poland. This is the strongest earthquake within about 150 km of this epicenter in Poland since an M 4.3 on April 17, 2015. Forecast 121337 had expected this activity was likely mid-January.

 

O: 13JAN2020 13:34:16  50.2N   18.8E ML=3.9  EMSC   POLAND                        

O: 13JAN2020 13:34:17  50.1N   18.7E ML=4.2  ANSS   POLAND                       

P: 15JAN2020 121337    51.0N   16.0E 3.0-4.6 AABAA  Poland                     

P: 22JAN2020 121337    51.0N   19.0E 3.0-4.4 CAAAA  Poland                      

 

The most unusual earthquake in the U.S. or Canada today was an M 3.3-4.0 in Quebec, Canada - New York border. NEIC reported maximum intensity IV in New York at Churubusco, Burke, Chateaugay, Ormstown, Quebec, Huntingdon, Ellenburg, Mooers Forks, Evon Mountain among others. Earthquakes Canada reported this earthquake was strongly felt in Canada in Saint Bruno, Vaudreuil, Montreal. There were no reports of damage. The last earthquake within about 150 km of this epicenter with M>=3.4 occurred August 5, 2015 with M 3.5. The last of M>=4.0 was an M 4.2 on November 6, 2012.  Forecast 121308 had expected today's event was likely in this area around January 17.

 

O: 13JAN2020 10:37:59  45.0N   74.0W mb=3.4  EMSC   NEW YORK                     

O: 13JAN2020 10:37:59  45.0N   74.0W MB=4.0  ECAN Huntingdon, QC. Felt   

P: 17JAN2020 121308    44.0N   73.0W 2.0-3.8 BAAAA  New England                

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the aftershock zone of the Gulf of Alaska. It was not reported felt in this remote area. The last earthquake in this sequence with M>=4.2 occurred on December 4, 2019 - also with M 4.2. These are aftershocks of the great M 7.9 which hit the area on January 23, 2018.  Forecast 121353 had expected today's activity was likely in this zone around January 15.

 

O: 13JAN2020 09:00:20  56.0N  149.3W mb=4.2  EMSC   GULF OF ALASKA               

O: 13JAN2020 16:44:32  56.6N  148.3W ml=3.0  EMSC   GULF OF ALASKA               

P: 15JAN2020 121353    55.4N  149.8W 3.0-4.5 ABAAA  Gulf of  Alaska            

 

Moderate aftershocks also continued in the region of Puerto Rico today. Tropical Storm Claudia is near the antipode of Puerto Rico at this time and may continue to enhance seismicity in the area of Puerto Rico and the Dominican Republic at this time due to antipodal effects. This summary had noted this as:

 

"TC Claudia continued today in the region north of Western Australia with winds up to 90 kts. It is expected to track to the west over the next several days. It will be antipodal to the Dominican Republic today and may help continue aftershocks in that area for the next several days. Seismicity to the north in Indonesia is also expected to be enhanced by stresses from this storm." (January 13-14, 2020)

 

Following is a listing of Puerto Rico aftershocks of M>=4.0 today. The largest were of M 4.4 and 4.5. A listing of events of M>=3.0 con be found in the "AMERICA" section below. Forecast 121228 had expected continuing aftershocks in the area in mid-January.

 

O: 13JAN2020 10:01:29  17.9N   66.7W mb=4.4  EMSC   PUERTO RICO REGION

O: 13JAN2020 17:06:30  17.9N   66.8W ML=4.1  EMSC   PUERTO RICO REGION

O: 13JAN2020 07:07:38  17.9N   66.8W mb=4.2  EMSC   PUERTO RICO REGION

O: 14JAN2020 01:40:52  17.9N   66.8W mb=4.5  EMSC   PUERTO RICO REGION

O: 13JAN2020 20:46:40  17.9N   66.9W mb=4.3  EMSC   PUERTO RICO REGION

P: 14JAN2020 121228    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

The strongest activity in the world today was a pair of moderate M 5.0 and 5.1 events in eastern Honshu, Japan. NEIC reported the earthquake of M 5.1 in Honshu, Japan  was felt with intensity II-III in the area(s) of Honshu, Japan at Chiba, Ibaraki, Fukushima and Tokyo. NEIC reported the earthquake of M 5.0 in Eastern Honshu, Japan  was felt with intensity II-III in the area(s) of Eastern Honshu, Japan in Ibaraki and Chiba (IV); and Saitama, and Tokyo. While this region frequently sees moderate quakes, the last of M>=5.1 occurred as an

M 5.6 on January 2, 2020 and prior to that an M 5.8 on March 10, 2019. Today's

activity may be aftershocks of the January 2 events. Forecast 121270 had expected today's events were likely within about 100 km of these epicenters around January 14.

 

O: 13JAN2020 19:53:48  36.0N  139.9E mb=5.0  EMSC   EASTERN HONSHU, JAPAN        

O: 14JAN2020 04:25:49  36.1N  140.9E mb=5.1  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 14JAN2020 121270    36.0N  142.0E 4.0-5.3 AAAAA  Off East Coast Honshu      

 

Volcanic tremor continued near Taal Volcano, Mindoro, Philippines today. Local officials expected this could precede a major eruption. Millions of people live in the Manila area about 40 miles north of this and could be affected by a major eruption of this volcano. Forecast 121220 had expected the area to be active in mid-January.

 

O: 13JAN2020 07:29:54  13.9N  120.8E ML=3.6  EMSC   MINDORO, PHILIPPINES

O: 13JAN2020 09:38:19  13.9N  120.9E ML=3.6  EMSC   MINDORO, PHILIPPINES

O: 13JAN2020 18:58:48  13.9N  120.9E ML=3.6  EMSC   MINDORO, PHILIPPINES

O: 13JAN2020 14:22:36  13.9N  120.9E ML=3.8  EMSC   MINDORO, PHILIPPINES

O: 14JAN2020 04:46:56  14.0N  120.9E ML=3.5  EMSC   LUZON, PHILIPPINES

O: 13JAN2020 07:41:41  14.0N  120.9E ML=3.6  EMSC   MINDORO, PHILIPPINES

O: 13JAN2020 11:48:54  14.0N  120.9E ML=3.7  EMSC   LUZON, PHILIPPINES

O: 14JAN2020 02:58:14  14.0N  120.9E ML=3.7  EMSC   MINDORO, PHILIPPINES

O: 13JAN2020 08:24:52  14.0N  120.9E ML=4.0  EMSC   MINDORO, PHILIPPINES

O: 13JAN2020 15:39:34  14.0N  120.9E ML=4.0  EMSC   MINDORO, PHILIPPINES

O: 13JAN2020 10:18:52  14.0N  121.2E mb=4.6  EMSC   MINDORO, PHILIPPINES

O: 13JAN2020 18:05:52  14.1N  121.1E ML=3.9  EMSC   LUZON, PHILIPPINES

O: 13JAN2020 07:06:45  13.8N  120.9E ML=3.5  EMSC   MINDORO, PHILIPPINES         

P: 15JAN2020 121220    14.0N  121.0E 3.5-4.8 AAAAA  Luzon, Philippines         

 

TAAL VOLCANO IN PHILIPPINES ERUPTS

 

EARTHQUAKE SUMMARY FOR JANUARY 12, 2020

 

Taal Volcano in central Philippines erupted today. Ash and lava were seen eruption from the volcano. This is a potentially dangerous eruption and the Philippine officials have issued a warning that this could be followed by a much stronger eruption. Taal Volcano is located 70 km south of Manila and a major eruption could severely affect that major metropolis. The eruption was accompanied by a series of moderate earthquakes leading to the expectation of stronger activity in the area. The last earthquake of M>=4.6 near in Mindoro, Philippines within about 100 km of today's epicenters occurred September 6 and 9, 2019 at intermediate depth. The first moderate quake in this series occurred at 15:56 UT with M 4.6. This is within minutes of local solar midnight and suggests that the eclipse and full moon of January 10 probably helped trigger this volcanism as noted in the forecast for tidal seismicity in previous issues of this summary:

 

"The full moon arrived on January 10 at 19:21 UT. Longitudes which were at maximum tidal stress are near 110 West and 70 East and include in the west area of western U.S. and Canada and in the east the areas of central Asia including Pakistan and Afghanistan. These areas could see enhanced seismicity during the next week. Other areas of the world also respond seismically to high tidal stresses and could be triggered at this time.  Some areas show maximum effect on seismicity at local solar noon and midnight when earth tides are strongest at the full moon. This will be a full eclipse of the moon which will be greatest over northern India south of Pakistan near 25N 70E. This area has been active in recent days and could see additional seismicity related to the full moon/eclipse. The antipode at 25S 110W in on the East Pacific Rise which could also see enhanced seismicity at this time." (January 8-12, 2020)

 

Forecast 121013 had expected today's activity within about 150 km was likely  in early January. This activity is located at 105 degrees from the M 7.1 in Ridgecrest, California of July 6, 2019. A series of large quakes have hit in the Philippines and Indonesia since that California event at this distance and  may have set Taal up for eruptions at this time.

 

O: 12JAN2020 19:24:26  13.9N  121.1E mb=4.3  EMSC   MINDORO, PHILIPPINES

O: 12JAN2020 21:19:28  13.9N  121.2E mb=4.5  EMSC   MINDORO, PHILIPPINES

O: 13JAN2020 04:07:35  14.0N  120.8E ML=4.1  EMSC   MINDORO, PHILIPPINES

O: 13JAN2020 03:37:49  14.0N  120.9E ML=3.7  EMSC   MINDORO, PHILIPPINES

O: 13JAN2020 01:07:42  14.0N  120.9E ML=4.0  EMSC   LUZON, PHILIPPINES

O: 12JAN2020 19:11:48  14.0N  120.9E ML=4.1  EMSC   MINDORO, PHILIPPINES

O: 12JAN2020 20:08:39  14.0N  120.9E ML=4.1  EMSC   MINDORO, PHILIPPINES

O: 12JAN2020 22:35:17  14.0N  120.9E ML=4.1  EMSC   MINDORO, PHILIPPINES

O: 12JAN2020 15:56:32  14.0N  121.0E mb=4.6  EMSC   MINDORO, PHILIPPINES

O: 12JAN2020 20:55:46  14.1N  121.4E mb=4.6  EMSC   LUZON, PHILIPPINES

O: 13JAN2020 02:47:32  13.9N  120.9E ML=3.7  EMSC   MINDORO, PHILIPPINES         

P:  6JAN2020 121013    13.0N  122.0E 3.5-4.8 CAAAA  Luzon, Philippines         

 

 

Moderate aftershocks continued in Puerto Rico today, the strongest of which was M 4.9. The area is still assessing the damage from the M 5.9-6.0 of January 11. Considerable additional damage occurred with this aftershock. This included loss of water and power as well as landslides. Many people have chosen to live in tents for fear of additional damaging aftershocks throughout the island. Earthquakes today were felt with maximum intensity VI in Puerto Rico at Guayanilla; IV in Ponce, Adjuntas, Sabanad, Jayuya, and II-III in Coto Laurel, Utuado and Lajas, among others throughout the island. Following is a listing of aftershocks today in Puerto Rico of M>=4. Those of M>=3 are listed in the "AMERICA" Section below. Forecast 120119 had expected continuing moderate aftershocks in the region at this time.

 

O: 12JAN2020 10:54:58  17.8N   66.9W mb=4.6  EMSC   PUERTO RICO REGION

O: 13JAN2020 02:52:29  17.9N   66.7W mb=4.4  EMSC   PUERTO RICO REGION

O: 12JAN2020 21:01:02  17.9N   66.8W ML=4.0  EMSC   PUERTO RICO REGION

O: 12JAN2020 21:10:13  17.9N   66.8W Mw=4.0  EMSC   PUERTO RICO REGION

O: 13JAN2020 03:05:19  17.9N   66.8W mb=4.6  EMSC   PUERTO RICO REGION

O: 12JAN2020 07:59:56  17.9N   66.8W mb=4.9  EMSC   PUERTO RICO REGION

O: 12JAN2020 23:33:44  18.0N   67.1W ML=4.0  EMSC   PUERTO RICO                  

P:  9JAN2020 121019    19.0N   67.0W 3.4-4.9 BAAAA  Puerto Rico                

 

The strongest earthquakes in the U.S. or Canada today occurred in the Aleutian Islands of Alaska. These events of M 5.0 in the Fox Islands and of M 4.9 in the Rat Islands were not reported felt. The M 5.0 in the Fox Islands is the largest within about 150 km within the Fox Islands since an M 5.8 on October 26, 2019 and prior to that an M 5.1 on January 28, 2017. Forecast 121118 had expected this activity was likely around January 11. The event in the Rat Islands of M 4.9 was the strongest in this area since an M 5.0 on October 5, 2019 and prior to that an M 5.3 on April 14, 2019. An M 5.0 also occurred about 200 km southwest of today's epicenter on December 27, 2019. Forecast 121123 had expected this activity was likely around January 9.

 

O: 12JAN2020 16:22:25  52.1N  178.2E mb=4.9  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  9JAN2020 121123    51.0N  176.0E 4.0-5.5 BBBAA  Rat Islands                

 

O: 12JAN2020 19:07:01  52.8N  169.2W ml=3.8  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 13JAN2020 03:07:02  53.3N  169.5W mb=5.0  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 11JAN2020 121118    52.4N  169.4W 3.5-4.8 AAAAA  Fox Islands, Aleutians     

 

The strongest earthquake in the world today was an M 5.3 in Neuquen, Argentina. No damage was associated with this event. NEIC reported this earthquake of M 5.3 in Argentina  was felt with intensity II-III in the area(s) of Argentina at Bariloche Rio Negro and in Chile at Papguipulli, La Union, Osorno and Valdivia, Los Lagos and in Temuco, Araucania and Villarrica, Araucania, Chile. This is the strongest earthquake within about 150 km of this epicenter since an M 6.1 on September 26, 2019, the only such event in the region in at least 10 years.  Forecast 121164 had expected this activity to the northwest around January 11.

 

O: 13JAN2020 02:01:40  40.3S   71.2W Mw=5.3  EMSC   NEUQUEN, ARGENTINA           

P: 11JAN2020 121164    37.0S   74.0W 4.0-5.3 ACCAA  Central Chile              

 

ADDITIONAL DAMAGE, POWER OUTAGES WITH NEW M 5.9-6.0 IN PUERTO RICO

 

EARTHQUAKE SUMMARY FOR JANUARY 11, 2020

 

An M 5.9-6.0 earthquake in southern Puerto Rico and a strong series of aftershocks continued to increase the damages and power disruptions in Puerto today. The mainshock today was reported by NEIC with maximum intensity VI in Puerto Rico at Guayanilla, Lajas, Ponce; V in Yauco, Sabana, Penuelas, and IV in Ensenada. Many moderate aftershocks were felt in the same area. This and a series of events in Pakistan may have been promoted by tidal effects related to the full moon and eclipse of January 10. The forecast associated with that tidal event read: 

 

"The full moon will arrive on January 10 at 19:21 UT. Longitudes which are at maximum tidal stress are near 110 West and 70 East and include in the west area of western U.S. and Canada and in the east the areas of central Asia including Pakistan and Afghanistan. These areas could see enhanced seismicity during the next week. Other areas of the world also respond seismically to high tidal stresses and could be triggered at this time.  Some areas show maximum effect on seismicity at local solar noon and midnight when earth tides are strongest at the full moon. This will be a full eclipse of the moon which will be greatest over northern India south of Pakistan near 25N 70E. This area has been active in recent days and could see additional seismicity related to the full moon/eclipse. The antipode at 25S 110W in on the East Pacific Rise which could also see enhanced seismicity at this time." (January 5-9, 2020)

 

The initial activity in Puerto Rico which led to the current level began in late December and had also been related to tidal stresses at that time in this summary as:

 

"These events may related to the new moon of December 26 which occurred near the

longitude of Puerto Rico and probably helped promoted this activity at this time. This summary had noted this in previous issues" (December 28-29, 2019)

 

Following is a list of events in Puerto Rico of M>=4 today. A more complete listing of aftershocks of M>=3 is found in the "AMERICA" Section below. Forecast 121019 had expected this activity around January 9.

 

O: 11JAN2020 12:54:45  17.9N   66.9W mw=5.9  ANSS   Guanica Puerto Rico

O: 11JAN2020 12:54:44  17.8N   66.8W Mw=5.9  EMSC   PUERTO RICO REGION

O: 12JAN2020 02:28:32  17.8N   66.8W Mw=4.0  EMSC   PUERTO RICO REGION

O: 11JAN2020 12:56:22  17.8N   66.8W mb=5.2  EMSC   PUERTO RICO REGION

O: 11JAN2020 13:05:30  17.8N   66.9W ML=4.1  EMSC   PUERTO RICO REGION

O: 11JAN2020 13:59:49  17.8N   66.9W ML=4.1  EMSC   PUERTO RICO REGION

O: 12JAN2020 00:58:35  17.8N   66.9W mb=4.4  EMSC   PUERTO RICO REGION

O: 11JAN2020 23:49:43  17.9N   66.7W Mw=4.5  EMSC   PUERTO RICO REGION

O: 11JAN2020 11:14:53  17.9N   66.8W ML=4.0  EMSC   PUERTO RICO REGION

O: 11JAN2020 13:51:40  17.9N   66.8W ML=4.0  EMSC   PUERTO RICO REGION

O: 11JAN2020 21:26:43  17.9N   66.8W ML=4.0  EMSC   PUERTO RICO REGION

O: 11JAN2020 07:25:28  17.9N   66.8W ML=4.2  EMSC   PUERTO RICO REGION

O: 11JAN2020 15:41:17  17.9N   66.8W ML=4.4  EMSC   PUERTO RICO REGION

O: 11JAN2020 15:31:13  17.9N   66.8W Ml=4.1  EMSC   PUERTO RICO REGION

O: 11JAN2020 07:28:41  17.9N   66.8W mb=4.2  EMSC   PUERTO RICO REGION

O: 11JAN2020 13:48:13  17.9N   66.8W mb=4.6  EMSC   PUERTO RICO REGION

O: 11JAN2020 08:59:51  17.9N   66.9W mb=4.3  EMSC   PUERTO RICO REGION

O: 11JAN2020 18:32:54  18.0N   66.8W Mw=4.0  EMSC   PUERTO RICO

P:  9JAN2020 121019    19.0N   67.0W 3.4-4.9 AAAAA  Puerto Rico                

 

 

An earthquake of M 5.1 in Pakistan today was felt with intensity III in Dharamshala, Himachal, Pradesh, India. This, and a series of lesser events including an M 4.0 in Pakistan occurred near the point of maximum eclipse with the full moon on January 10 (see forecast above and in the "TIDAL" section), and were probably promoted from that source. The M 5.1 in Kashmir follows an M  5.4 on December 30, 2019 about 70 km north of today's epicenter and is likely a regional aftershock of that event. Forecast 121047 had expected this activity within about 50 km was likely in early January, 2020. The activity in Iran is at 102-104 degrees from Puerto Rico and was probably enhanced by energy from that source.

 

 

O: 12JAN2020 05:24:00  35.0N   74.4E mb=5.1  EMSC   NORTHWESTERN KASHMIR          

P:  3JAN2020 121047    35.0N   74.0E 3.8-5.1 CAAAA  Hindu Kush/Pakistan        

 

O: 11JAN2020 09:50:14  26.0N   57.6E ML=3.7  EMSC   NEAR COAST OF SOUTHEASTERN IRA

P: 11JAN2020 121032    28.0N   54.0E 3.5-4.9 ABCAA  So. Iran/Persian Gulf      

 

O: 12JAN2020 02:18:43  27.4N   67.6E mb=4.0  EMSC   PAKISTAN                     

P:  1JAN2020 120841    33.0N   74.0E 3.8-5.1 CCCAA  Pakistan                   

 

O: 12JAN2020 03:01:46  28.8N   51.3E mb=4.2  EMSC   SOUTHERN IRAN                

P:  3JAN2020 121032    29.0N   51.0E 3.5-4.9 CAAAA  So. Iran/Persian Gulf      

P: 11JAN2020 121032    28.0N   54.0E 3.5-4.9 AABAA  So. Iran/Persian Gulf      

 

O: 11JAN2020 14:29:17  30.4N   50.6E ML=3.5  EMSC   SOUTHERN IRAN                

P:  9JAN2020 121071    31.0N   51.0E 3.8-5.3 AAAAA  So. Iran                   

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in the western Andreanof Islands, Aleutians, Canada. It was not reported felt in this remote area. This is the largest event in the Western Andreanof Islands within about 150 km of this epicenter since an M 4.4 on December 22, 2019. The last events in the area of lager magnitude were an M 4.7 on November 5, 2019 and an M 4.6 on July 27, 2019. Forecast 121112 had expected today's event in this area was likely around January 9. It was followed by the second largest earthquake in the world today - an M 5.6 at the antipode in the Bouvet Island area south of Africa.

 

 

O: 12JAN2020 00:50:01  52.9N  173.1W mb=4.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  9JAN2020 121112    51.7N  173.7W 3.5-4.8 BBAAA  Andreanoff Isls, Aleutians 

 

The event of M 5.6 in the Bouvet Island region followed its antipodal counterpart in the Andreanof Islands by about an hour-and-a-half. It was not reported felt in this remote area. This is the strongest quake in the Bouvet Island region within about 250 km of this epicenter since an M 6.5 on December 13, 2017 and an M 6.6 on January 28, 2018 to the east of today's epicenter.

This and the antipodal Andreanof Island quake at high latitudes may have been promoted by the geomagnetic storm of January 9-10.

 

O: 12JAN2020 02:26:59  54.4S    5.2E Mw=5.6  EMSC   BOUVET ISLAND REGION         

 

An earthquake of M 4.0 in Baja California, Mexico was widely felt today. NEIC reported it was felt with intensity II-III in Delta Baja, Guadalupe, Puebla, Tecolotes, Mexicali, Baja California, Mexico and in California at Mexicali, Calexico, El Centro, Imperial and Winterhaven. The last earthquake of M>=4 in this region of Baja California occurred on November 12, 2019 (M 4.0) and November 19, 2018 (M 4.8). Forecast 121063 had expected today's activity to the west around January 9.

 

O: 12JAN2020 05:21:02  32.4N  115.2W ML=4.0  EMSC   BAJA CALIFORNIA, MEXICO      

P:  9JAN2020 121063    32.0N  117.4W 2.5-4.3 BABAA  So. California             

 

 

FULL MOON BRINGS SEISMIC ENHANCEMENT IN OKLAHOMA AND PUERTO RICO

 

EARTHQUAKE SUMMARY FOR JANUARY 10, 2020

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in the region of Oklahoma. NEIC reported it was felt with intensity IV in Ames an Drummond, Oklahoma and II-III in Meno, Enid, and Tulsa. It followed a smaller M 3.0 foreshock half an hour earlier that was felt with intensity III in Ames, Oklahoma. The strongest quakes in Oklahoma tend to recur near the time of the full and new moons as reported previously when the last earthquake in Oklahoma of greater magnitude  was recorded (an M 4.4 on May 17, 2019) in this summary:

 

 

"As often occurs, Oklahoma saw enhanced seismic activity today with the strongest in a series of events of M 3.4. It is common for the area to become activated at times of full moons when tidal forces are strong and can affect ground water significantly. At M 3.4, this is the strongest earthquake within about 100 km of this epicenter since an M 3.4 on February 28 and an M 3.8 on February 26, 2019. Forecast 115982 had expected today's activity was likely within about 100 km of these epicenters around May 17." (May 16-17, 18, December 30, 2019)

 

and

 

"The last earthquake in Oklahoma within about 100 km of today's M 4.4 epicenter occurred as an M 4.4 nearly a year ago on June 9, 2018. The last of significantly larger magnitude in this area was an M 5.6-5.8 on September 3, 2016. That event occurred in conjunction with an annular solar eclipse  and new moon which occurred on September 1." (May 18, 2019)

 

An earthquake of M 3.7, modified from an original report of M 4.2 on December 30, 2019 was also coincident with the last new moon. Today's M 3.8 occurred within about an hour of local solar midnight and was near the longitude of maximum tidal stress (110 West longitude) as reported in the current full moon forecast and was probably promoted from these stresses as noted in that forecast:

 

"The full moon will arrive on January 10 at 19:21 UT. Longitudes which are at maximum tidal stress are near 110 West and 70 East and include in the west area of western U.S. and Canada and in the east the areas of central Asia including Pakistan and Afghanistan. These areas could see enhanced seismicity during the next week. Other areas of the world also respond seismically to high tidal stresses and could be triggered at this time.  Some areas show maximum effect on seismicity at local solar noon and midnight when earth tides are strongest at the full moon. This will be a full eclipse of the moon which will be greatest over northern India south of Pakistan near 25N 70E. This area has been active in recent days and could see additional seismicity related to the full moon/eclipse. The antipode at 25S 110W in on the East Pacific Rise which could also see enhanced seismicity at this time." (January 5-9, 2020)

 

Forecast 121075 had expected this earthquake of M 3.8 would occur around January 11.

 

O: 11JAN2020 05:13:20  36.3N   98.2W mb=3.0  EMSC   OKLAHOMA

O: 11JAN2020 05:40:17  36.3N   98.2W mb=3.6  EMSC   OKLAHOMA

O: 11JAN2020 05:40:18  36.3N   98.2W mb=3.8  ANSS   OKLAHOMA

O: 10JAN2020 23:45:16  36.4N   98.1W ML=2.3  EMSC   OKLAHOMA

O: 10JAN2020 22:40:30  34.9N   97.7W mb=2.3  EMSC   OKLAHOMA                     

P: 11JAN2020 121075    35.0N   96.0W 2.0-4.1 AABAA  Southern Plains            

 

Moderate aftershocks also continued unabated in Puerto Rico today. The largest was an M 5.2 felt with moderate intensity throughout Puerto Rico with others of M 4.0-4.8 and occurred near local solar midnight, a time when tidal stresses associated with today's full moon were maximized (see forecast above). This included an M 4.7-4.8 at 04:09 UT - within 15 minutes of local solar midnight. The M 4.8 was felt with maximum intensity VI in Puerto Rico at Guayanilla; V in Yauco, Ponce, and Adjuntas; IV in Penuelas, Sabana and Mercedita with lesser shaking throughout the island.

 

Forecast 121019 had expected this activity Puerto Rico in early January.

Following is a list of aftershocks of M>=4 in Puerto Rico today a listing of

M>=3 is listed under the "AMERICA" section below.

 

O: 10JAN2020 08:05:28  17.9N   66.7W mb=4.6  EMSC   PUERTO RICO REGION

O: 11JAN2020 02:28:21  17.9N   66.8W Mw=4.9  EMSC   PUERTO RICO REGION

O: 10JAN2020 22:26:24  17.9N   66.8W Mw=5.2  EMSC   PUERTO RICO REGION

O: 11JAN2020 04:08:50  18.0N   66.7W mb=4.7  EMSC   PUERTO RICO REGION

O: 10JAN2020 08:41:11  18.0N   66.9W mb=4.4  EMSC   PUERTO RICO

P:  6JAN2020 121019    18.0N   67.0W 3.4-4.8 BAAAA  Puerto Rico                

P:  9JAN2020 121019    19.0N   67.0W 3.4-4.9 AAAAA  Puerto Rico                

 

 

A pair of light earthquakes in Yellowstone National Park, Wyoming today of M 2.1 and 2.6 appears to have also been triggered by high tides associated with the full moon. The largest of these occurred within minutes of local solar noon within minutes of the full moon at a longitude of maximum tidal stress (110 West). The M 2.6 is the strongest in eastern Yellowstone since an M 3.4 on December 15, 2019 and an M 2.8 on November 24, 2019. Forecast 121090 had expected activity in this area around January 11.

 

NEIC reported this earthquake of M 2.6 in Yellowstone, Wyoming  was felt with intensity II-III in the area(s) of Yellowstone, Wyoming at Cody.

 

O: 10JAN2020 22:57:45  44.7N  110.0W ML=2.6  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 10JAN2020 20:05:02  44.7N  110.0W Md=2.1  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 11JAN2020 121090    44.5N  112.6W 2.0-3.8 AABAA  Montana/Idaho              

 

A series of moderate earthquakes at high latitudes today were probably promoted by the geomagnetic storm of the past two days as expected in this summary in previous issues:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 12.  High latitude geomagnetic field saw stormy conditions  with AP at 32. This may enhance seismicity at high latitudes and may have promoted the M 6.1 in northeastern Russia today.." (January 10, 2020)

 

The largest of today's events was an M 5.4 south of Africa. It occurred near local solar midnight and near the time of the full moon and during the lunar eclipse today and was probably also promoted by the tidal stresses from this event. The antipode of this event at 53N 157W is in the Alaskan Peninsula and could see additional seismic enhancement at this time. Today's earthquake south of Africa is located at 104 degrees from the activity in Puerto Rico and was probably promoted by energy from that source.

 

O: 10JAN2020 20:59:49  53.2S   23.3E mb=5.4  EMSC   SOUTH OF AFRICA              

 

Other moderate earthquakes at high latitude include moderate events in the Komandorsky Islands, Chukota and Severnaya Zemlya, Russia. These were probably enhanced by the geomagnetic storm.

 

O: 11JAN2020 06:35:10  54.3N  169.0E mb=4.4  EMSC   KOMANDORSKIYE OSTROVA REGION 

P:  5JAN2020 121120    55.0N  169.0E 4.0-5.5 CAAAA  Near Islands               

 

O: 10JAN2020 12:10:32  62.2N  170.8E mb=4.1  EMSC   CHUKOTKA, RUSSIA             

P:  8JAN2020 121132    61.0N  167.0E 3.5-5.0 ABBAA  North of Kamchatka         

 

O: 10JAN2020 17:57:36  83.4N  115.0E mb=4.3  EMSC   NORTH OF SEVERNAYA ZEMLYA    

P: 11JAN2020 121138    82.0N  119.0E 4.0-5.3 ABAAA  Arctic Ocean Region        

 

A series of other earthquakes of M 5.4 also occurred today. These were located in the Vanuatu and Kermadec Islands and in  Jalisco, Mexico. The M 5.4 in  Jalisco occurred at 105 degrees West longitude near the longitude of maximum tidal stress with the full moon and eclipse today. This is the strongest earthquake in Jalisco within about 250 km of this epicenter since an event of M 6.0 a year-and-a-half ago on June 30 with M 5.9-6.0. NEIC reported today's earthquake of M 5.4  west of Jalsico, Mexico was felt with intensity II-III in the area(s) of Jalisco, Mexico at San Patricio, El Salto, Puerto Vallarta, Mapa, Guadalajara. Forecast 121014 had expected a moderate earthquake in this region was likely around January 7. 

 

The events in the Kermadec Islands and Vanuatu had been expected in early January  in forecasts 121150, 121167 and 121171.

 

O: 10JAN2020 15:21:22  18.4N  105.2W Mw=5.4  EMSC   OFF COAST OF JALISCO, MEXICO 

O: 10JAN2020 19:13:20  18.5N  105.4W ML=3.8  EMSC   OFF COAST OF JALISCO, MEXICO 

P:  7JAN2020 121014    18.0N  104.0W 3.5-5.1 BAAAA  Michoacan, Mexico          

 

O: 10JAN2020 22:54:44  29.9S  179.0W mb=5.4  EMSC   KERMADEC ISLANDS REGION      

P:  8JAN2020 121167    30.0S  177.0W 4.0-5.3 AABAA  No. Kermadec Islands       

P: 10JAN2020 121171    31.0S  178.0W 4.0-5.4 ABAAA  So. Kermadec Islands       

 

O: 10JAN2020 16:32:30  15.3S  167.7E mb=5.0  EMSC   VANUATU                      

O: 10JAN2020 20:06:41  16.7S  167.5E Mw=5.4  EMSC   VANUATU                      

P: 10JAN2020 121150    17.0S  168.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

 

M 6.3 IN CHUKOTKA, RUSSIA LIKELY TRIGGERED BY UNEXPECTED GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR JANUARY 9, 2020

 

The strongest earthquake of the day was an M 6.3 in northeastern Siberia, Russia. An unexpected strong geomagnetic storm with high latitude AP 32-45 was coincident with the high latitude earthquakes in northeastern Russia. This is the strongest geomagnetic storm at high latitudes in more than a month. The last of significantly stronger AP at high latitudes was on October 25-26 when the index reached 62 and 59. Today's storm reached maximum disturbance at 08-09 UT and the event in Chutkotka, Russia at 08:38 UT coincided with this maximum. It is highly likely that the Russian earthquake was triggered by stresses associated with this geomagnetic storm.

 

The M 6.3 was preceded by a foreshock of M 4.0 20 minutes earlier and showed  a strong aftershock sequence in the next day including events of M 4.7 and 4.8 and 5.0. This is the strongest earthquake within about 300 km of this epicenter in at least 30 years. A series of earthquakes hit the region southwest of this beginning on April 20, 2006 with an M 7.3 mainshock. This epicenter was about 400 km from today's activity. Forecast 121132 had expected activity in this region was possible around January 8. These epicenters are near the fourth node (90 degrees) from the M 6.5 in Puerto Rico and could have been enhanced by energy from that source as well.

 

O: 09JAN2020 10:47:19  62.2N  171.0E mb=4.7  EMSC   CHUKOTKA, RUSSIA

O: 09JAN2020 16:06:49  62.3N  170.8E mb=4.3  EMSC   CHUKOTKA, RUSSIA

O: 10JAN2020 04:50:33  62.3N  170.9E mb=4.3  EMSC   CHUKOTKA, RUSSIA

O: 09JAN2020 09:56:47  62.3N  170.9E mb=4.8  EMSC   CHUKOTKA, RUSSIA

O: 09JAN2020 10:11:11  62.3N  171.0E mb=5.0  EMSC   CHUKOTKA, RUSSIA

O: 09JAN2020 08:18:00  62.3N  171.1E mb=4.0  EMSC   CHUKOTKA, RUSSIA

O:  9JAN2020 08:38:10  62.3N  171.2E Mw=6.3  EMSC   CHUKOTKA, RUSSIA             

P:  8JAN2020 121132    61.0N  167.0E 3.5-5.0 ABBAA  North of Kamchatka         

 

The second largest earthquake in the world today was an M 5.4 in the near-antipodal South Sandwich Islands. This is an active area and today's event at high latitude was probably promoted by the geomagnetic storm and by antipodal energy from the Russian quake. Forecast 121177 had expected today's event was likely around January 10 within about 50 km of this epicenter.

 

O:  9JAN2020 17:15:04  56.1S   26.8W mb=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 10JAN2020 121177    56.0S   26.0W 4.0-5.8 AAAAA  So. Sandwich Islands       

 

Aftershocks of the M 6.5 earthquake in Puerto Rico of January 7, 2020 continued to be felt today. The largest of the day was an M 4.4 which NEIC reported was felt with intensity V in Mayaguez; IV in Aguadilla, and II-III in Penuelas, Ponce, Anasco, Rincon, Albonito, Vega Baja and Naranjito among others.

The U.S. declared an State of Emergency for the Islands opening up federal funds for reconstruction in the area. A health alert was also issued for the region.

The M 6.3 in Chukotka, Russia was followed about a minute later an an M 4.2 in Puerto Rico. Like the Russian event this was also probably promoted by the geomagnetic storm. Following is a list of aftershocks in Puerto Rico today of M>=4. A list of M>=3.0 is found in the "AMERICA" section below.

 

O: 09JAN2020 20:11:22  17.9N   66.7W mb=4.0  EMSC   PUERTO RICO REGION

O: 09JAN2020 11:24:41  17.9N   67.0W mb=4.3  EMSC   PUERTO RICO REGION

O: 09JAN2020 08:39:23  18.0N   66.8W ML=4.2  EMSC   PUERTO RICO REGION

P:  6JAN2020 121019    18.0N   67.0W 3.4-4.8 BAAAA  Puerto Rico                

P:  9JAN2020 121019    19.0N   67.0W 3.4-4.9 ABAAA  Puerto Rico                

 

Two moderate earthquake in eastern Iran (M 4.1) and Iraq (M 4.7) today may have been related to today's upcoming lunar eclipse and the Puerto Rico M 6.5. They occurred in the distance range (97-107 degrees) in which seismic energy concentrates on the surface after strong earthquakes and can help enhance further seismicity at this distance range. The event of M 4.1 in eastern Iran was also near the point of maximum tidal stress with today's lunar eclipse and full moon and may have been enhanced from this as well. The tidal forecast had noted:

 

"The full moon will arrive on January 10 at 19:21 UT. Longitudes which are at maximum tidal stress are near 110 West and 70 East and include in the west area of western U.S. and Canada and in the east the areas of central Asia including Pakistan and Afghanistan. These areas could see enhanced seismicity during the next week. Other areas of the world also respond seismically to high tidal stresses and could be triggered at this time.  Some areas show maximum effect on seismicity at local solar noon and midnight when earth tides are strongest at the full moon. This will be a full eclipse of the moon which will be greatest over northern India south of Pakistan near 25N 70E. This area has been active in recent days and could see additional seismicity related to the full moon/eclipse. The antipode at 25S 110W in on the East Pacific Rise which could also see enhanced seismicity at this time." (January 5-9, 2020)

 

O: 10JAN2020 06:24:44  34.0N   60.3E ML=4.1  EMSC   EASTERN IRAN                 

P:  4JAN2020 121061    35.0N   60.0E 3.8-5.1 CAAAA  Pakistan                   

 

NEIC reported the earthquake of M 4.7 in Iraq  was felt with intensity II-III in the area(s) of Iraq.

 

O:  9JAN2020 10:52:00  34.6N   45.5E mb=4.7  EMSC   IRAN-IRAQ BORDER REGION      

P:  6JAN2020 121071    33.0N   46.0E 3.8-5.2 BBAAA  So. Iran                   

 

CARRIBEAN SEISMICITY SPREADS TO GUADELOUPE

 

EARTHQUAKE SUMMARY FOR JANUARY 8, 2020

 

An earthquake of M 5.1 occurred today in the Leeward Islands of the eastern Caribbean today. NEIC reported it was felt with maximum intensity IV in La Francis Le Marin, Martinique and II-III in Martinique at Le Morne-Rouge, Saint-Pierre and Le Robert La Trinite. It is likely that energy from the M 6.5 in Puerto Rico of January 7 helped promoted this earthquake at this time.

This is the strongest earthquake in the Leeward Islands since an M 5.4 on September 28, 2018 and prior to that on February 3, 2017. Forecast 121011 had expected today's activity was likely in the Leeward Islands around January 6.

 

O:  8JAN2020 14:01:52  15.2N   61.4W mb=5.1  EMSC   DOMINICA REGION, LEEWARD ISLAN

P:  6JAN2020 121011    16.0N   60.0W 3.0-4.9 AABAA  Leeward Islands            

 

Aftershocks continued to be felt in southern Puerto Rico after the M 6.4 there on January 7, 2020. Moderate events of M>=4 were reported felt with maximum intensity V in Puerto Rico at Ponce; IV in Mercedita, Coto Laurel, Juana Diaz, Villalba and II-III in Utuado, Adjuntas, and Yauco. Following is a list of today's aftershocks of M>=4 in Puerto Rico. A more extensive list of M>=3 is found in the "AMERICA" section below.

 

O: 08JAN2020 12:41:22  17.8N   66.9W ML=4.2  EMSC   PUERTO RICO REGION

O: 08JAN2020 20:04:17  17.9N   66.7W Mw=4.5  EMSC   PUERTO RICO REGION

O: 08JAN2020 15:45:42  17.9N   66.7W mb=4.5  EMSC   PUERTO RICO REGION

O: 08JAN2020 10:33:07  17.9N   66.8W ML=4.1  EMSC   PUERTO RICO REGION

O: 08JAN2020 11:44:16  17.9N   66.8W mb=4.1  EMSC   PUERTO RICO REGION

O: 09JAN2020 05:03:11  17.9N   66.8W mb=4.5  EMSC   PUERTO RICO REGION

O: 08JAN2020 09:19:58  18.0N   66.7W mb=4.1  EMSC   PUERTO RICO

P:  6JAN2020 121019    18.0N   67.0W 3.4-4.8 BAAAA  Puerto Rico                

P:  9JAN2020 121019    19.0N   67.0W 3.4-4.9 ABAAA  Puerto Rico                

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.4-4.7 in the Vancouver Island, Canada area. It was not reported felt in this area. This is probably an aftershock of the strong series of events in the region on December 23 and 25, 2019 which included events of M 6.0, 6.0 and 6.3. Forecasts 121114 and 121107 had expected today's activity around January 6-11.

 

O:  8JAN2020 20:20:41  50.9N  130.0W mb=4.4  EMSC   VANCOUVER ISLAND, CANADA REGIO

O:  8JAN2020 20:20:38  50.7N  130.5W MB=4.7  ECAN Port Hardy, BC                 

P:  6JAN2020 121114    50.3N  130.2W 3.0-4.9 AAAAA  British Colombia           

P:  9JAN2020 121107    49.9N  130.2W 2.8-4.9 AAAAA  Vancouver Island area      

 

Shishaldin Volcano in the Alaskan Aleutian Islands erupted Tuesday January 7.

Two ash clouds rose to 5800 meters and required rerouting of air traffic flying between North America and Asia. Shishaldin is located on Unimak Island, Alaska. The eruption was associated with earthquakes in the Unimak region of M 3.0 and 3.6 on January 3 and 4, 2020. It may also have been triggered by energy from the M 6.5 in Puerto Rico on January 7.

 

Two light earthquakes in the area today included an M 3.9 and 3.5. This activity had been expected in mid-January in forecasts 121118 and 121111.

 

O:  8JAN2020 14:45:31  53.3N  166.9W mb=3.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  8JAN2020 121118    53.7N  165.3W 3.5-4.8 AAAAA  Fox Islands, Aleutians     

 

O:  9JAN2020 02:28:34  55.6N  160.1W ML=3.5  EMSC   ALASKA PENINSULA             

P: 11JAN2020 121111    54.8N  158.7W 3.5-4.8 AAAAA  Alaska Peninsula           

 

The strongest earthquake in the world today was an M 5.2 in the southwest Indian Ridge. This epicenter is near antipodal to Baja and Southern California and could promote further activity in that region. Forecast 120955 had expected the southern Indian Ocean to be active in early January or late December within about 300 km of today's epicenter.

 

O:  9JAN2020 00:55:44  29.5S   61.3E Mw=5.2  EMSC   SOUTHWEST INDIAN RIDGE       

P: 29DEC2019 120955    32.0S   59.0E 4.0-5.3 CCBAA  So. Indian Ocean           

 

STRONG SEISMICITY CONTINUES IN PUERTO RICO; NEW BRITAIN

 

EARTHQUAKE SUMMARY FOR JANUARY 7, 2020

 

The series of aftershocks in southern Puerto Rico continued today with an M 5.5 and 5.8 among many of lesser magnitude. Most of the aftershocks were felt with intensity up to V in Orocovis, San German, Puerto Rico and IV in Ponce and Bananquitas with lesser shaking throughout Puerto Rico, for example at Maricao, Hormigueros, Mayaguez, Corozal, Toa Alta and Caguas, Puerto Rico. The strongest aftershocks were of M 5.8 and M 5.6 and probably added to the damage. NEIC reported today's mainshock of M 6.5 was felt throughout Puerto Rico with intensity IV with maximum shaking of VI in Hormigueros and V in Arecibo, Vega Alta, Bayamon, San Juan and IV in Aguadilla, Dorado, Caguas, and most other communities in Puerto Rico. This activity follows the M 6.5 earlier in the day which was reported in the previous issue of this summary as:

 

"A strong earthquake of M 6.5-6.6 shook the area of Puerto Rico in which heavy damage occurred in an M 5.8 yesterday. Foreshocks to the M 6.6 of M 4.3, 4.4 and 4.9 were the largest prior to the mainshock. It was felt with intensity V in Puerto Rico at Yauco and IV in Guanica, Guayanilla, Lajas, Ponce, and II-II in Penuelas, Sabana and most of the island of Puerto Rico. The strongest aftershock to this report were of M 5.8 and M 5.6 and probably added to the damage. NEIC reported today's mainshock of M 6.5 was felt throughout Puerto Rico with intensity IV with maximum shaking of VI in Hormigueros and V in Arecibo, Vega Alta, Bayamon, San Juan and IV in Aguadilla, Dorado, Caguas, and most other communities in Puerto Rico. It was also felt in the Bahamas, Virgin Islands, Dominica, Dominican Republic, Saint Martin, Guadeloupe, Haiti, Montserrat, Saint Kitts and Nevis, Turks and Caicos Islands, Antigua and Barbuda and Anguilla.

At least one person was killed in today's activity and there was wide-scale power outages. The M 5.8 also toppled a natural wonder and tourist attraction called Punta Ventana. Many homes were destroyed or damaged in the M 5.8 and many more were destroyed in today's M 6.5-6.6. TV and Internet photos and videos showed a number of heavily damages structures including cars pancaked beneath collapsed parking structures. No tsunami warnings are in effect but small tsunamis can happen with earthquakes off the coast of this magnitude." (January 7, 2020)

 

and

 

"Forecast 121019 had expected today's activity was likely around January 6 within about 25 km of these epicenters. At M 6.5 this is the strongest earthquake in Puerto Rico in more than 30 years. The previous such events of M>6 in this area in area since 1990 occurred on January 13, 2014 (M 6.4) and September 22, 2003 (M 6.4) both in northern Puerto Rico. The last earthquake of M>=6.5 in the area was an M 6.6 on June 24, 1984 and an M 6.5 on June 11, 1971. The last of significantly larger magnitude was an M 7.1 on August 3, 1961. A great tsunamigenic quake hit the region with M 8.1 on August 4, 1946 and was followed by an M 7.9 four days later on  August 8, 1946." (January 7, 2020)

 

 

O: 07JAN2020 08:50:45  17.9N   66.7W Mw=5.0  EMSC   PUERTO RICO REGION

O: 07JAN2020 14:23:38  17.9N   66.7W mb=4.4  EMSC   PUERTO RICO REGION

O: 07JAN2020 11:14:50  17.9N   66.7W mb=4.5  EMSC   PUERTO RICO REGION

O: 07JAN2020 14:39:34  17.9N   66.7W mb=4.5  EMSC   PUERTO RICO REGION

O: 07JAN2020 09:08:57  17.9N   66.8W ML=4.1  EMSC   PUERTO RICO REGION

O: 07JAN2020 11:18:42  17.9N   66.8W Mw=5.8  EMSC   PUERTO RICO REGION

O: 07JAN2020 19:58:56  17.9N   66.8W mb=4.2  EMSC   PUERTO RICO REGION

O: 07JAN2020 14:04:45  17.9N   66.8W mb=4.6  EMSC   PUERTO RICO REGION

O: 07JAN2020 16:27:06  17.9N   66.8W mb=4.7  EMSC   PUERTO RICO REGION

O: 07JAN2020 18:43:45  17.9N   66.9W mb=4.3  EMSC   PUERTO RICO REGION

O: 08JAN2020 00:59:48  17.9N   66.9W mb=4.3  EMSC   PUERTO RICO REGION

O: 07JAN2020 13:22:07  18.0N   66.7W ML=4.1  EMSC   PUERTO RICO

O: 07JAN2020 09:35:37  18.0N   66.7W ML=4.2  EMSC   PUERTO RICO REGION

O: 07JAN2020 18:10:55  18.0N   66.7W Mw=4.2  EMSC   PUERTO RICO

O: 07JAN2020 10:13:55  18.0N   66.7W mb=4.3  EMSC   PUERTO RICO REGION

O: 07JAN2020 10:28:11  18.0N   66.7W mb=4.3  EMSC   PUERTO RICO REGION

O: 07JAN2020 12:10:44  18.0N   66.7W mb=4.4  EMSC   PUERTO RICO REGION

O: 07JAN2020 20:32:59  18.0N   66.7W mb=4.4  EMSC   PUERTO RICO REGION

O: 07JAN2020 09:41:31  18.0N   66.7W mb=4.5  EMSC   PUERTO RICO REGION

O: 07JAN2020 13:00:21  18.0N   66.7W mb=4.6  EMSC   PUERTO RICO

O: 07JAN2020 09:18:54  18.0N   66.8W ML=4.1  EMSC   PUERTO RICO REGION

O: 07JAN2020 12:21:02  18.0N   66.8W ML=4.1  EMSC   PUERTO RICO REGION

O: 07JAN2020 11:28:19  18.0N   66.8W ML=4.4  EMSC   PUERTO RICO REGION

O: 08JAN2020 03:52:48  18.0N   66.8W Ml=4.1  EMSC   PUERTO RICO

O: 07JAN2020 15:55:11  18.0N   66.8W mb=4.3  EMSC   PUERTO RICO

O: 07JAN2020 12:54:42  18.0N   66.9W ML=4.0  EMSC   PUERTO RICO

O:  7JAN2020 08:34:02  17.8N   66.7W Mw=5.6  EMSC   PUERTO RICO REGION           

P:  6JAN2020 121019    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

Outside Puerto Rico, the strongest earthquake of the day was an M 6.0 in the region of New Britain. This is the strongest earthquake within about 200 km of this epicenter since an M 6.2 on July 15, 2019, six months ago. An M 7.5 occurred about 150 km northeast of today's epicenter on May 14, 2019. Forecast 120989 had expected today's event was likely within about 100 km of this epicenter around January 11. This epicenter is located at 142 degrees from Puerto Rico and may have been promoted by energy from that source.

 

O:  7JAN2020 19:11:36   5.1S  151.2E Mw=6.0  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 11JAN2020 120989     5.0S  152.0E 4.0-5.3 BAAAA  New Britain                

 

The strongest earthquake in the U.S. or Canada today was an M 3.6 in Hawaii.

NEIC reported this earthquake of M 3.6 in Hawaii  was felt with intensity II-III in the area(s) of Hawaii at Hawaii National Park, Captain Cook, Volcano, Mountain View, Kurtistown, Kailua Kona and Honomu. This is the strongest earthquake in Hawaii since an M 4.9 two months ago on November 11, 2019 and prior to that an M 4.5 on August 12, 2019.  Forecast 121010 had expected this activity was likely around January 6.

 

O:  7JAN2020 14:44:46  19.2N  155.4W Ml=2.3  EMSC   ISLAND OF HAWAII, HAWAII     

O:  7JAN2020 12:04:42  19.4N  155.5W Ml=3.6  EMSC   ISLAND OF HAWAII, HAWAII     

P:  6JAN2020 121010    19.9N  155.1W 3.0-4.4 AAAAA  Hawaii                     

 

Two moderate earthquakes in southern Iran of M 4.5 and 4.9 were lightly felt in the area today. These epicenters are located at 104 degrees from the M 6.5 in Puerto Rico and may have been promoted by energy from that source. Forecasts 121032 and 121071 had expected this activity within about 25 km was likely in early January. This is an expected reaction to the Puerto Rico event as noted in the previous issue of this summary:

 

"This earthquake is on the edge of being large enough to trigger significant activity at far field distances. Any triggering effect is likely to be small but for illustrative purposes a map showing nodal distances from Puerto Rico has been included in this report. Few area of seismic interest lie near 103 degrees from Puerto Rico with the exception of some in central Asia which has been active in recent days and may see a moderate to large quake with the full moon near January 10." (January 7,, 2020)

 

 

O:  8JAN2020 03:19:13  29.1N   51.3E mb=4.5  EMSC   SOUTHERN IRAN                

O:  8JAN2020 02:20:02  29.1N   51.3E mb=4.9  EMSC   SOUTHERN IRAN                

P:  3JAN2020 121032    29.0N   51.0E 3.5-4.9 BAAAA  So. Iran/Persian Gulf      

P:  9JAN2020 121071    31.0N   51.0E 3.8-5.3 ABAAA  So. Iran                   

 

STRONG M 6.5-6.6 EARTHQUAKE HITS PUERTO RICO; M 6.2 IN SUMATRA, INDONESIA

 

EARTHQUAKE SUMMARY FOR JANUARY 6, 2020

 

A strong earthquake of M 6.5-6.6 shook the area of Puerto Rico in which heavy damage occurred in an M 5.8 yesterday. Foreshocks to the M 6.6 of M 4.3, 4.4 and 4.9 were the largest prior to the mainshock. It was felt with intensity V in Puerto Rico at Yauco and IV in Guanica, Guayanilla, Lajas, Ponce, and II-II in Penuelas, Sabana and most of the island of Puerto Rico. The strongest aftershock to this report were of M 5.8 and M 5.6 and probably added to the damage. NEIC reported today's mainshock of M 6.5 was felt throughout Puerto Rico with intensity IV with maximum shaking of VI in Hormigueros and V in Arecibo, Vega Alta, Bayamon, San Juan and IV in Aguadilla, Dorado, Caguas, and most other communities in Puerto Rico. It was also felt in the Bahamas, Virgin Islands, Dominica, Dominican Republic, Saint Martin, Guadeloupe, Haiti, Montserrat, Saint Kitts and Nevis, Turks and Caicos Islands, Antigua and Barbuda and Anguilla.  At least one person was killed in today's activity and there was wide-scale power outages. The M 5.8 also toppled a natural wonder and tourist attraction called Punta Ventana. Many homes were destroyed or damaged in the M 5.8 and many more were destroyed in today's M 6.5-6.6. TV and Internet photos and videos showed a number of heavily damages structures including cars pancaked beneath collapsed parking structures. No tsunami warnings are in effect but small tsunamis can happen with earthquakes off the coast of this magnitude. In the previous summary the effects of the M 5.8 yesterday had been noted as:

 

The current location of TC Blake is now near the antipode of Puerto Rico at:

 

"TC    BLAKE    2020-01-07  00:00 UT  18.0S  121.0E   45 kts  North of Western Australia

 

"This area has been active for about a week with a series of events with maximum magnitude up to 5.0. This is the strongest earthquake in Puerto Rico since an M 5.8 on May 28, 2014 and an M 5.8 on May 16, 2010, the only two such events in the past 30 years. This summary had expected enhanced seismicity in Puerto Rico at this time. In the previous issue of this summary it had been noted:

 

 

"The series of moderate earthquakes in Puerto Rico continued today with two events of M 4.8 and many of lesser magnitude. These appear to be migrating to the east along the southern border of Puerto Rico. NEIC reported maximum shaking VI in Lajas, Puerto Rico but light intensity was reported throughout the island. Intensity IV was reported from Ponce, Ensenada, Penuelas with V in Guanica, Ensenada, Guayanilla and Yauco, Puerto Rico. A similar series hit about 25 km to the west of this on December 29,, 2019 with M 5.0. Forecast 120791 had expected this activity at the end of December or early January." (January 3, 2020)

 

and on January 1 it was noted:

 

"Moderate aftershocks continued in southwestern Puerto Rico today. An M 4.6 was reported felt with maximum intensity V in Puerto Rico at Ensenada; IV in Guanica, Yauco, Penuelas, Ponce, and II-III in Guayanilla, Lajas. This follows a week of aftershocks in this area which included events of M 4.9 and 5.0

on December 28-29, 2019. At the time this summary noted in this regard:

 

"The last earthquake within about 150 km of today's epicenter with M>=5 occurred as an M 5.3 on December 17, 2011, part of a series including an M 5.2 on December 17, 2011 and an M 5.0 on December 24, 2010. When an M 4.5 hit Puerto Rico on December 17 this summary noted:

 

"A swarm of minor earthquakes occurred in the area of Puerto Rico today. While these not include any moderate events, they may indicate a high level of stress at this epicenter. Puerto Rico often sees a spike in seismicity in mid-December so this is not a surprising development." (December 17, 29 2019, January 1, 2020)

 

Other factors encouraging enhanced seismicity in Puerto Rico at this time include Tropical Cyclone Blake which was incipient at the antipode of Puerto Rico and was noted in previous issues as:

 

"A tropical cyclone may be forming off northwestern Australia. This system is currently located at 16S 121E and moving to the south with winds up to 33 kts. The area could see some enhancement in seismicity to the north. The antipode to this storm is in the Leeward Islands, Caribbean. Seismicity in this area is currently high especially in Puerto Rico and regional enhancement is likely if this storm becomes more powerful. An M 3.1 north of Australia today may have been enhanced by stresses from this system." (January 4-6, 2020)

 

"TC    BLAKE    2020-01-06  00:00 UT  15.9S  121.9E   45 kts  North of Western Australia

 

 

Tropical cyclone Blake formed off northwestern Australia with winds up to 45 kts. It is expected to track to the south over the next several days.  The area could see some enhancement in seismicity to the north. The antipode to this storm is in the Leeward Islands, Caribbean where an M 4.4 in the Dominican Republic occurred today. Seismicity in this area is currently high especially in Puerto Rico and regional enhancement is likely if this storm becomes more powerful. An M 3.1 north of Australia today may have been enhanced by stresses from this system." (January 5-6, 2020)

 

The upcoming full moon and eclipse of January 10 is also a possible source of tidal stress for Puerto Rico at this time. The forecast associated with this tidal alignment reads:

 

"The full moon will arrive on January 10 at 19:21 UT. Longitudes which are at maximum tidal stress are near 110 West and 70 East and include in the west area of western U.S. and Canada and in the east the areas of central Asia including Pakistan and Afghanistan. These areas could see enhanced seismicity during the next week. Other areas of the world also respond seismically to high tidal stresses and could be triggered at this time.  Some areas show maximum effect on seismicity at local solar noon and midnight when earth tides are strongest at the full moon. This will be a full eclipse of the moon which will be greatest over northern India south of Pakistan near 25N 70E. This area has been active in recent days and could see additional seismicity related to the full moon/eclipse. The antipode at 25S 110W in on the East Pacific Rise which could also see enhanced seismicity at this time." (January 4-7, 2020)

 

Forecast 121019 had expected today's activity was likely around January 6 within about 25 km of these epicenters. At M 6.5 this is the strongest earthquake in Puerto Rico in more than 30 years. The previous such events of M>6 in this area in area since 1990 occurred on January 13, 2014 (M 6.4) and September 22, 2003 (M 6.4) both in northern Puerto Rico. The last earthquake of M>=6.5 in the area was an M 6.6 on June 24, 1984 and an M 6.5 on June 11, 1971. The last of significantly larger magnitude was an M 7.1 on August 3, 1961. A great tsunamigenic quake hit the region with M 8.1 on August 4, 1946 and was followed by an M 7.9 four days later on August 8, 1946.

 

This earthquake is on the edge of being large enough to trigger significant activity at far field distances. Any triggering effect is likely to be small but for illustrative purposes a map showing nodal distances from Puerto Rico has been included in this report. Few area of seismic interest lie near 103 degrees from Puerto Rico with the exception of some in central Asia which has been active in recent days and may see a moderate to large quake with the full moon near January 10.

  

O: 07JAN2020 08:50:45  17.7N   66.7W ML=5.2  EMSC   PUERTO RICO REGION

O: 07JAN2020 08:34:12  17.7N   66.8W Mw=5.5  EMSC   PUERTO RICO REGION

O: 06JAN2020 14:51:17  17.9N   66.7W mb=5.0  EMSC   PUERTO RICO REGION

O: 06JAN2020 07:43:54  17.9N   66.8W ML=3.0  EMSC   PUERTO RICO REGION

O: 06JAN2020 11:55:23  17.9N   66.8W ML=3.7  EMSC   PUERTO RICO REGION

O: 06JAN2020 12:44:37  17.9N   66.8W ML=3.9  EMSC   PUERTO RICO REGION

O: 06JAN2020 13:58:03  17.9N   66.8W ML=3.9  EMSC   PUERTO RICO REGION

O: 06JAN2020 16:29:08  17.9N   66.8W ML=3.9  EMSC   PUERTO RICO REGION

O: 06JAN2020 12:07:31  17.9N   66.8W Md=3.0  EMSC   PUERTO RICO REGION

O: 06JAN2020 10:36:16  17.9N   66.8W Md=3.2  EMSC   PUERTO RICO REGION

O: 06JAN2020 11:12:02  17.9N   66.8W Ml=3.0  EMSC   PUERTO RICO REGION

O: 06JAN2020 10:32:20  17.9N   66.8W Mw=5.7  EMSC   PUERTO RICO REGION

O: 07JAN2020 08:24:26  17.9N   66.8W Mw=6.5  EMSC   PUERTO RICO REGION

O: 06JAN2020 13:51:35  17.9N   66.9W ML=3.2  EMSC   PUERTO RICO REGION

O: 06JAN2020 11:39:36  17.9N   66.9W Md=3.0  EMSC   PUERTO RICO REGION

O: 06JAN2020 14:07:24  18.0N   66.8W Ml=3.3  EMSC   PUERTO RICO REGION

O: 06JAN2020 14:58:21  18.0N   66.8W mb=4.2  EMSC   PUERTO RICO

O:  6JAN2020 21:37:55  18.0N   66.8W mb=4.7  EMSC   PUERTO RICO REGION           

P:  6JAN2020 121019    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

 

A strong earthquake of M 6.2 also occurred today in the region of Sumatra, Indonesia. NEIC reported it was felt with intensity II-III in Medan, Sumatra, Indonesia and in Malaysia at Sungai Ara Pulau, Georgetown, Butterworth, Juru and Petaling Jaya, Selangor. This could have also been related to regional stresses from TC Blake (see above) as it made landfall near the time of this event. This area has been relatively quiet the past five years as stresses rebuild after the Boxing Day earthquake and Tsunami of December 26, 2004. The last earthquake in the area within about 200 km of this epicenter of M>=6.2 was an M 6.4 on July 25, 2012. A great earthquake of M 8.1-8.6 hit about 100 km east of today's epicenter on March 28, 2005 and was probably triggered  by stresses from the event in December, 2004. Forecast 120979 had expected today's event within about 50 km was likely around January 7, 2020.

 

O:  7JAN2020 07:04:41   2.3N   96.2E ML=4.2  EMSC   SIMEULUE, INDONESIA          

O:  7JAN2020 06:05:20   2.5N   96.4E Mw=6.2  EMSC   SIMEULUE, INDONESIA          

P:  7JAN2020 120979     2.0N   96.0E 4.0-5.4 AAAAA  Nicobar Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 3.7-4.1 in the King William Island area near Spence Bay, Nunavut, Canada. It was not reported felt in this remote area. This is the strongest earthquake within about 200 km of this epicenter since an M 4.3 more than 10 years ago on August 30, 2009. Other such events in the past 30 years have occurred on January 7, 2002 (M 4.7) and June 27, 1992 (M 4.6). This epicenter is at 103 degrees from the last major global earthquake - the M 7.1 in Molucca of November 14, 2019 and may have been promoted by energy from that source.

 

O:  6JAN2020 23:18:56  69.9N   96.3W ML=3.7  EMSC   KING WILLIAM ISL., NUVAVUT, CA

O:  6JAN2020 23:18:56  69.9N   96.0W MB=4.1  ECAN OF TALOYOAK (SPENCE BAY), NU   

O:  6JAN2020 23:18:56  69.9N   96.3W MB=3.7  ECAN Taloyoak, NU                   

 

MODERATELY STRONG QUAKE HITS PUERTO RICO

 

EARTHQUAKE SUMMARY FOR JANUARY 5, 2020

 

A moderately strong earthquake of M 5.8 hit the region of southern Puerto Rico today with minor damage reported. NEIC reported maximum intensity VI in Guanica and Guayanilla; V in Ponce, Penuelas, Yauco, IV in Ensenada, Carolina and San Juan. Intensity II-III was felt within about 150 km of the epicenter. NEIC reported a foreshock of M 3.5 in Puerto Rico  was felt with intensity II-III in the area(s) of Puerto Rico at San Juan. This area has been active for about a week with a series of events with maximum magnitude up to 5.0.  This is the strongest earthquake in Puerto Rico since an M 5.8 on May 28, 2014 and an M 5.8 on May 16, 2010, the only two such events in the past 30 years. This summary had expected enhanced seismicity in Puerto Rico at this time. In the previous issue of this summary it had been noted:

 

 

"The series of moderate earthquakes in Puerto Rico continued today with two events of M 4.8 and many of lesser magnitude. These appear to be migrating to the east along the southern border of Puerto Rico. NEIC reported maximum shaking VI in Lajas, Puerto Rico but light intensity was reported throughout the island. Intensity IV was reported from Ponce, Ensenada, Penuelas with V in Guanica, Ensenada, Guayanilla and Yauco, Puerto Rico. A similar series hit about 25 km to the west of this on December 29,, 2019 with M 5.0. Forecast 120791 had expected this activity at the end of December or early January." (January 3, 2020)

 

and on January 1 it was noted:

 

"Moderate aftershocks continued in southwestern Puerto Rico today. An M 4.6 was reported felt with maximum intensity V in Puerto Rico at Ensenada; IV in Guanica, Yauco, Penuelas, Ponce, and II-III in Guayanilla, Lajas. This follows a week of aftershocks in this area which included events of M 4.9 and 5.0 on December 28-29, 2019. At the time this summary noted in this regard:

 

"The last earthquake within about 150 km of today's epicenter with M>=5 occurred as an M 5.3 on December 17, 2011, part of a series including an M 5.2 on December 17, 2011 and an M 5.0 on December 24, 2010. When an M 4.5 hit Puerto Rico on December 17 this summary noted:

 

"A swarm of minor earthquakes occurred in the area of Puerto Rico today. While these not include any moderate events, they may indicate a high level of stress at this epicenter. Puerto Rico often sees a spike in seismicity in mid-December so this is not a surprising development." (December 17, 29 2019, January 1, 2020)

 

Other factors encouraging enhanced seismicity in Puerto Rico at this time include Tropical Cyclone Blake which was incipient at the antipode of Puerto Rico and was noted in previous issues as:

 

"A tropical cyclone may be forming off northwestern Australia. This system is currently located at 16S 121E and moving to the south with winds up to 33 kts. The area could see some enhancement in seismicity to the north. The antipode to this storm is in the Leeward Islands, Caribbean. Seismicity in this area is currently high especially in Puerto Rico and regional enhancement is likely if this storm becomes more powerful. An M 3.1 north of Australia today may have been enhanced by stresses from this system." (January 4-6, 2020)

 

"TC    BLAKE    2020-01-06  00:00 UT  15.9S  121.9E   45 kts  North of Western Australia

 

 

“Tropical cyclone Blake formed off northwestern Australia with winds up to 45 kts. It is expected to track to the south over the next several days.  The area could see some enhancement in seismicity to the north. The antipode to this storm is in the Leeward Islands, Caribbean where an M 4.4 in the Dominican Republic occurred today. Seismicity in this area is currently high especially in Puerto Rico and regional enhancement is likely if this storm becomes more powerful. An M 3.1 north of Australia today may have been enhanced by stresses from this system." (January 5-6, 2020)

 

The upcoming full moon and eclipse of January 10 is also a possible source of tidal stress for Puerto Rico at this time. The forecast associated with this tidal alignment reads:

 

 

"The full moon will arrive on January 10 at 19:21 UT. Longitudes which are at maximum tidal stress are near 110 West and 70 East and include in the west area of western U.S. and Canada and in the east the areas of central Asia including Pakistan and Afghanistan. These areas could see enhanced seismicity during the next week. Other areas of the world also respond seismically to high tidal stresses and could be triggered at this time.  Some areas show maximum effect on seismicity at local solar noon and midnight when earth tides are strongest at the full moon. This will be a full eclipse of the moon which will be greatest over northern India south of Pakistan near 25N 70E. This area has been active in recent days and could see additional seismicity related to the full moon/eclipse. The antipode at 25S 110W in on the East Pacific Rise which could also see enhanced seismicity at this time." (January 4-6, 2020)

 

Forecast 121019 had expected today's event was likely as a moderate quake within

about 25 km of this epicenter around January 6.

 

O:  6JAN2020 10:32:21  18.0N   66.7W ML=5.7  EMSC   PUERTO RICO REGION           

O:  6JAN2020 10:32:21  18.0N   66.7W ML=5.8  ANSS   PUERTO RICO REGION           

P:  6JAN2020 121019    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

Today's event followed an M 4.4 to the west of this epicenter in the Dominican Republic earlier in the day. 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 San Pedro de Macoris, Guayabo Dulce, Otra Banda and Santo Domingo. Forecast 121020 had expected this earthquake was likely within about 50 km of this epicenter around January 5. This is the strongest earthquake within about 100 km of this epicenter since an M 4.7 on July 28, 2019.

 

O:  5JAN2020 08:29:00  18.4N   69.0W mb=4.4  EMSC   DOMINICAN REPUBLIC REGION    

P:  5JAN2020 121020    19.0N   69.0W 3.4-4.8 AAAAA  Puerto Rico                

 

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 off the coast of Oregon. NEIC reported this earthquake of M 3.7  off the coast of  Oregon  was felt with intensity II-III in the area(s) of Oregon at Eugene.  It may have been felt lightly on the coast of Oregon. The last event within about 100 km of this epicenter with M>=3.7 occurred on October 21, 2019 with M 4.6.  Forecast 121099 had expected today's epicenter to be active within about 50 km around January 6.

 

O:  5JAN2020 11:13:50  43.5N  128.6W ML=3.7  EMSC   OFF COAST OF OREGON          

P:  6JAN2020 121099    44.0N  128.4W 3.0-4.3 AAAAA  Off Coast of Oregon        

 

STRONG EARTHQUAKE SHAKES OAXACA, MEXICO

 

EARTHQUAKE SUMMARY FOR JANUARY 4, 2020

 

The strongest earthquake of the day was an M 5.8-6.0 south of Oaxaca, Mexico. NEIC reported maximum intensity VI in Comitancillo, Oaxaca, Mexico and V in Ixtepec with IV in Oaxaca at Mitla and in Chiapas, Mexico at Tuxtla Guitierrez. Intensity II-III was also reported from Chiapas at Bochil, San Cristobal de las Casas and Chanal and in Oaxaca at Amatlan, Xadani, and Tehuantepec. This is the first strong (M>=6) earthquake in the world in the year 2020, a relatively quiet start to seismicity thus far. This may change in the next several days as the full moon and lunar eclipse arrive on January 10.

 

"The full moon will arrive on January 10 at 19:21 UT. Longitudes which are at maximum tidal stress are near 110 West and 70 East and include in the west area of western U.S. and Canada and in the east the areas of central Asia including Pakistan and Afghanistan. These areas could see enhanced seismicity during the next week. Other areas of the world also respond seismically to high tidal stresses and could be triggered at this time.  Some areas show maximum effect on seismicity at local solar noon and midnight when earth tides are strongest at the full moon. This will be a full eclipse of the moon which will be greatest over northern India south of Pakistan. This area has been active in recent days and could see additional seismicity related to the full moon/eclipse. The antipode at 20S 110W in on the East Pacific Rise which could also see enhanced seismicity at this time." (January 5, 2020)   

 

The last earthquake of M>=6 within about 200 km of this epicenter was an M 6.1 on September 23, 2017. Both that event and today's quake are probably aftershocks of the M 8.1 in the region about 200 km southeast of this of  September 8, 2017. Forecast 121006 had expected today's event within about 100 km of the epicenter was likely around January 6.

 

O:  5JAN2020 04:40:51  16.4N   94.3W Mw=6.0  EMSC   OAXACA, MEXICO               

P:  6JAN2020 121006    16.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

The event in Oaxaca, Mexico followed an M 4.8 in Iceland eight minutes earlier. This epicenter is at 70 degrees from Oaxaca. The P-wave from Iceland arrives in Oaxaca about 10 minutes after an earthquake in Iceland, after the event in Oaxaca occurred and could not have triggered the larger event in Oaxaca.

 

O:  5JAN2020 04:32:53  64.8N   17.6W mb=4.8  EMSC   ICELAND                      

 

An earthquake of M 4.9 occurred today in the region of maximum lunar eclipse of the upcoming full moon. NEIC reported this earthquake of M 4.9 in Southwestern Pakistan  was felt with intensity II-III in the area(s) of Southwestern Pakistan at Turbat, Baluchistan. This may have  been affected by tidal stresses and may see a further event nearer January 10. This event occurred within about half an hour of local solar noon when tidal stresses are maximized. Forecast 120805 had expected activity in this area at the end of December or early January.

 

O:  4JAN2020 08:24:36  25.5N   63.2E mb=4.9  EMSC   SOUTHWESTERN PAKISTAN        

P: 31DEC2019 120805    29.0N   68.0E 3.5-4.8 BCCAA  Pakistan                   

 

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the western Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. This region has been active in the past week. This included an M 5.2 on January 1, 2020. Forecast 121112 had expected today's event within about 100 km was likely around January 4.

 

O:  5JAN2020 04:59:56  51.3N  179.5W mb=4.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  4JAN2020 121112    52.3N  178.3W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

 

 

 

 

MODERATE QUAKE SHAKES NICARAGUA

 

EARTHQUAKE SUMMARY FOR JANUARY 3, 2020

 

The strongest earthquake in the world today was an M 5.5 in Nicaragua. NEIC reported maximum intensit IV in Nicaragua at Diriamba and Masaya and II-III in San Rafael del Sur Managua, La Paz, El Crucero, Nandasm, Niquinohomo, El Jicaro, Ticuatepe, Managua and Villa El Carmen. This is the largest earthquake in the area near Nicaragua within about 150 km of this epicenter since an M 5.9 on January 16, 2018 and prior to that an M 5.7 on December 31, 2015. Forecast 120785 had expected today's activity within about 50 km of this epicenter

was likely around January 1, 2020.

 

O:  3JAN2020 12:35:30  11.0N   86.4W ML=4.0  EMSC   NEAR COAST OF NICARAGUA      

O:  3JAN2020 15:28:54  11.7N   86.3W mb=5.5  EMSC   NEAR COAST OF NICARAGUA      

P:  1JAN2020 120785    12.0N   86.0W 3.5-5.0 AAAAA  Nicaragua                  

 

An earthquake of M 5.1-5.5 also occurred today north of North Island, New Zealand. GEONET reported this earthquake was felt with light intensity in the area of northern North Island,  New Zealand. 1503 persons reported feeling this earthquake with 1151 of weak  intensity; 339 with light intensity and 13 with moderate shaking. NEIC reported this earthquake of M 5.1 north of North Island, New Zealand  was felt with intensity II-III in the area(s)  North Island, New Zealand in Katakati, Whakatane, Opotiki, Bay of Plenty; Auckland, Te Karaka, Gisborne and in Hawke's Bay at Wairoa and Napier. This is the strongest earthquake recorded within about 100 km of this epicenter by NEIC since an M 5.8 on November 23, 2019 - an event which may have led to an eruption on White  Island which killed many. Prior to that the last such events had occurred as an M 5.6 on July 18, 2004 and an M 5.8 on February 16, 2013. Forecast 121168 had expected today's activity to the south was likely around January 5. Further activity at White Island may ensue this event.

 

O:  4JAN2020 07:18:19  37.0S  176.6E Mw=5.1  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 04DEC2020 07:18:19  36.8S  176.9E ML=5.5  GEONET Felt with light intensity

P:  5JAN2020 121168    39.0S  175.0E 3.0-4.3 ABAAA  North Island, N.Z.         

 

The strongest earthquakes in the U.S. or Canada outside Alaska today occurred west of Vancouver Island, British Columbia, Canada with M 3.5 and 3.7. They were not reported felt in this epicentral area. This area has seen several strong swarms in the past half year - including a series of moderate to large quakes around December 23-25, 2019 and a larger series July 4-5, 2019. Forecast 121114 had expected today's activity was likely within about 50 km around January 3.

 

 

O:  3JAN2020 18:05:34  50.8N  130.1W MB=3.5  ECAN Port Hardy, BC                 

O:  3JAN2020 16:44:50  50.6N  131.4W MB=3.7  ECAN Port Hardy, BC                 

P:  3JAN2020 121114    50.9N  130.6W 3.0-5.0 AAAAA  British Colombia           

 

The strongest earthquake in Alaska today was an M 4.1 in the northern Prudhoe Bay aftershock sequence. It was not reported felt in this remote area of northern Alaska. The area became active on August 12, 2018 with an M 6.3 mainshock but has been relatively quiet the past six months with the only event of M>=4.1 since early July 2019 an M 4.3 on December 16, 2019. A moderate event occurred with M 5.3 with the regional activation of Alaska of July 3, 2019. That activation migrated south and included events of M>=6 in Vancouver and Central California in the next several days. Forecast 120919 had expected today's event was likely within about 25 km of the epicenter in late December or early January, 2020.

 

O:  3JAN2020 13:16:17  69.7N  144.8W mb=4.1  EMSC   NORTHERN ALASKA              

P: 28DEC2019 120919    69.9N  144.8W 3.0-4.6 BAAAA  Northern Alaska            

 

STRONG QUAKE OFF EASTERN HONSHU, JAPAN SHAKES TOKYO

 

EARTHQUAKE SUMMARY FOR JANUARY  2, 2020

 

A moderately strong M 5.8 hit east of Tokyo, Japan today. NEIC reported maximum intensity IV in Chiba, Ibaraki with II-III in Tokyo. Over the past several years, Honshu Japan has been in a relaxed seismic state. This follows the great earthquake of M 9.3+ off the eastern coast on March 11, 2011 and is typical seismicity following great earthquakes within recovery periods. Only two other earthquakes have occurred in the past three years within about 200 km of today's event with M>=5.8 - an M 5.8 about 200 km north on March 10, 2019 and an M 5.8 near today's epicenter on July 7, 2018. The last of  larger magnitude was an M 6.2 on September 23, 2016. Forecasts 120834 and 121058 had expected today's activity was likely in early January.

 

O:  2JAN2020 18:23:53  35.8N  141.1E Mw=5.8  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  1JAN2020 120834    35.0N  139.0E 3.5-4.9 AABAA  No. Honshu, Japan          

P:  6JAN2020 121058    35.0N  140.0E 4.0-5.3 BAAAA  Off East Coast Honshu      

 

The series of moderate earthquakes in Puerto Rico continued today with two events of M 4.8 and many of lesser magnitude. These appear to be migrating to the east along the southern border of Puerto Rico. NEIC reported maximum shaking VI in Lajas, Puerto Rico but light intensity was reported throughout the island. Intensity IV was reported from Ponce, Ensenada, Penuelas with V in Guanica, Ensenada, Guayanilla and Yauco, Puerto Rico. A similar series hit about 25 km to the west of this on December 29,, 2019 with M 5.0. Forecast 120791 had expected this activity at the end of December or early January.

 

O: 02JAN2020 22:25:40  17.9N   66.8W ML=3.2  EMSC   PUERTO RICO REGION

O: 02JAN2020 22:31:26  17.9N   66.8W ML=3.3  EMSC   PUERTO RICO REGION

O: 02JAN2020 16:49:40  17.9N   66.8W ML=3.9  EMSC   PUERTO RICO REGION

O: 03JAN2020 04:21:50  17.9N   66.8W Md=3.1  EMSC   PUERTO RICO REGION

O: 02JAN2020 20:42:02  17.9N   66.8W mb=4.8  EMSC   PUERTO RICO REGION

O: 03JAN2020 03:41:15  17.9N   66.8W mb=4.8  EMSC   PUERTO RICO REGION

O: 02JAN2020 09:01:38  19.0N   67.5W ML=3.1  EMSC   PUERTO RICO REGION

O:  2JAN2020 15:33:41  17.9N   66.8W ML=3.0  EMSC   PUERTO RICO REGION           

P: 31DEC2019 120791    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

The strongest earthquake felt in the U.S. or Canada today was an M 4.2 in Southeastern Alaska. NEIC reported intensity II-III in Alaska at Elfin Cove, Hoonah, Haines, Douglas and Juneau. The earthquake of M 4.1-4.2 in southeastern Alaska was the strongest within about 150 km of that epicenter since an M 5.2 on December 18, 2019 and is probably an aftershock of that mainshock. Forecast 121127 had expected this activity around January 4.

 

O:  3JAN2020 02:57:35  58.5N  137.8W mb=4.1  EMSC   SOUTHEASTERN ALASKA          

O:  3JAN2020 02:57:35  58.5N  137.8W mb=4.2  ANSS   SOUTHEASTERN ALASKA          

P:  4JAN2020 121127    60.0N  137.0W 3.2-4.9 ABAAA  Central Alaska             

 

Earthquakes of  M 4.8  also occurred in the western Andreanof Islands and South of Kodiak Alaska, the strongest non-felt quake in the U.S. or Canada today was not reported felt. These events had been expected in late December or early January to occur within about 100 km of these epicenters in forecasts 121112 and 120920.

 

O:  2JAN2020 11:50:53  51.1N  179.4W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O:  2JAN2020 12:03:58  51.1N  179.4W mb=4.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  4JAN2020 121112    52.3N  178.3W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

O:  2JAN2020 08:54:32  55.6N  151.4W Mw=4.8  EMSC   SOUTH OF ALASKA              

P: 26DEC2019 120920    55.0N  149.8W 3.0-4.6 CAAAA  Gulf of  Alaska            

 

The strongest earthquake in California today was an unusually large M 4.0 in the Channel Islands, California south of Los Angeles. NEIC reported it was felt with intensity II-III in California at Point Mugu, Port Hueneme, Oxnard, Newbury Park, and Camarillo among many other communities. This follows an M 3.9 near Morgan Hill, Central California, consistent with regional activation of the area. In regard to the current state of seismicity in California, this summary had noted in the previous issue:

 

 

"An unusual earthquake of M 2.9 in central Nebraska preceded the event in Central California. NEIC reported it was felt with intensity II-III in Chambers, Inman, Ewing, Amelia, O'neill, Bloomfield and Brainard, Nebraska. Earthquakes in Nebraska sometimes occur when the plate is shifting possibly due to harmonic resonance with winter storms. As such, it can preceded moderate to strong earthquakes along the western boundary of North America." (January 1-2, 2020)

 

Today's event is the strongest in the Channel Islands of California within about 100 km of this epicenter since an M 5.3 on April 5, 2018 about 50 km west of today's epicenter. Forecast 120847 had expected today's activity was likely around December 31.

 

 

The timing of today's event in Southern California may also have been affected by its antipodal position to Tropical Cyclone Calvinia as noted in previous issues of this summary:

 

"TC Calvinia formed today in the region east of Mauritius and Reunion in the South Indian Ocean with winds up to 45 kts. It is expected to track to the south over the next several days reaching a point antipodal to the Gulf of California and southern California in early January 2020. It may promote seismicity in Baja and Southern California at that time. It is unlikely to trigger significant seismicity in the Indian Ocean with the exception of volcanism and related seismicity in the region of Mauritius and La Reunion in the next several days." (December 31, 2019)

 

O:  2JAN2020 10:12:59  33.9N  119.2W Mw=4.0  EMSC   CHANNEL ISLANDS REG., CALIFORN

P: 31DEC2019 120847    34.0N  118.7W 2.5-4.3 AAAAA  So. California             

 

An M 5.5 was also felt in the Solomon Islands today at Honiara, Guadalcanal.

Foredcast 120997 had expected this activity in early January.

 

O:  2JAN2020 13:41:31   9.7S  159.9E mb=5.5  EMSC   SOLOMON ISLANDS               

P:  2JAN2020 120997     8.0S  156.0E 4.0-5.3 ABCAA  Solomon Islands            

 

LIGHT QUAKE SHAKES CENTRAL CALIFORNIA AFTER QUAKE IN NEBRASKA

 

EARTHQUAKE SUMMARY FOR JANUARY  1, 2020

 

A moderate M 3.9 near Morgan Hill, Central California was widely felt in the region today. NEIC reported maximum intensity IV in Morgan Hill and San Martin with lesser shaking of II-III in San Jose, Gilroy, and other communities.

This earthquake which occurred within an hour of local solar midnight and may have been promoted by high tidal stresses which maximize near this hour. The last earthquake within about 50 km of Morgan Hill with M>=3.9 occurred December 27, 2017 with M 3.9 and prior to that on October 10, 2017 with M 4.1. Forecasts 120817 and 121041 had expected today's activity within this region was likely between December 27, 2019 and January 5, 2020.

 

O:  2JAN2020 07:16:31  37.2N  121.6W Mw=3.9  EMSC   NORTHERN CALIFORNIA          

P: 27DEC2019 120817    37.4N  121.8W 2.5-4.3 BAAAA  Central California         

P:  5JAN2020 121041    36.8N  121.3W 2.5-4.3 BAAAA  Central California         

 

An unusual earthquake of M 2.9 in central Nebraska preceded the event in Central California. NEIC reported it was felt with intensity II-III in Chambers, Inman, Ewing, Amelia, O'neill, Bloomfield and Brainard, Nebraska. Earthquakes in Nebraska sometimes occur when the plate is shifting possibly due to harmonic resonance with winter storms. As such, it can preceded moderate to strong earthquakes along the western boundary of North America. This is the strongest earthquake in Nebraska within about 150 km of this epicenter since an M  3.5 on January 4, 2016. An earthquake about 200 km northwest of this shook the area with an M 2.9.

 

The occurrence of light earthquakes in the eastern and central U.S. preceding moderate to large quakes on the western edge of North America Following the December 12, 2019 event this summary noted:

 

"... (harmonic resonance) shows up in many physical systems including some well known examples like the Tacoma Narrows Bridge collapse and lost airplane winds. If such resonance were to be excited by lower and higher atmospheric pressure on either end of the tectonic plate, over a series of cycles of similar atmospheric pressure changes, faults could begin to shift - with lesser magnitude in the eastern U.S. and higher magnitude in the west where faults are less constrained. This is behavior consistent with what is often observed prior to large earthquakes in the western North American Plate." (December 12, 2019)

 

O:  1JAN2020 18:08:04  42.2N   98.7W mb=2.9  EMSC   NEBRASKA                      

 

The strongest earthquakes in the U.S. or Canada today occurred in the Aleutian Islands with an M 5.2 continuing regional activation in the Andreanof Islands and an M 5.1 in the Near Islands at the western end of the Aleutian chain. Neither of these were reported felt in these remote areas. The M 5.2 in the Andreanof Islands is the strongest in that region since an M 6.0 on December 2, 2019 and is probably an aftershock of that event. Forecast 121112 had expected this epicenter would be active around January 4. The quake of M 5.1 in the Near Islands is the largest within about 150 km of that epicenter since an M 5.1 on August 26, 2017. These may be aftershocks of the M 6.2 in the Near Islands of March 27, 2017. An M 5.4 occurred about 250 km to the east of today's epicenter on October 26, 2019. Forecast 121120 had expected this event within about 50 km was likely around January 3.

 

O:  1JAN2020 15:05:57  51.3N  178.1W mb=5.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  4JAN2020 121112    52.3N  178.3W 3.5-4.9 BAAAA  Andreanoff Isls, Aleutians 

 

O:  1JAN2020 18:10:12  53.2N  170.4E mb=5.1  EMSC   NEAR ISLANDS, ALEUTIAN ISLANDS

P:  3JAN2020 121120    53.0N  171.0E 4.0-5.5 AAAAA  Near Islands               

 

The earthquake in the Andreanof Islands was followed an hour-and-a-half later by a similar M 5.0 near the antipode in the area southwest of Africa. Antipodal activity in these two areas is not unusual and may be related to external forcing.

 

O:  1JAN2020 16:34:58  53.1S    9.6E mb=5.0  EMSC   SOUTHWEST OF AFRICA          

 

The strongest earthquake in the world today was an M 5.5 in northeastern Iran.

NEIC reported this earthquake of M 5.5 in Northern Iran was felt with intensity II-III in the area(s) of Northern Iran in Meshed, Razavi, Iran.  This is part of a regional activation which in recent days has included moderate to large earthquakes in Pakistan and Hindu Kush, Afghanistan. It is at an unusual epicenter. The last event within about 150 km of this epicenter with M>=5.5 was an M 6.1 on December  5, 2012 and prior to that an M 5.5 on November 8, 1999. An M 6.1 about 200 km north of this occurred on April 5, 2017. Forecast 121061 had expected today's activity was likely around January 4.

 

O:  2JAN2020 04:48:53  34.0N   60.4E ML=3.7  EMSC   NORTHEASTERN IRAN            

O:  2JAN2020 04:29:06  34.0N   60.4E Mw=5.5  EMSC   NORTHEASTERN IRAN            

P:  4JAN2020 121061    35.0N   60.0E 3.8-5.1 AAAAA  Pakistan                   

 

MODERATE AFTERSHOCKS CONTINUE IN PUERTO RICO

 

EARTHQUAKE SUMMARY FOR DECEMBER 31, 2019

 

Moderate aftershocks continued in southwestern Puerto Rico today. An M 4.6 was reported felt with maximum intensity V in Puerto Rico at Ensenada; IV in Guanica, Yauco, Penuelas, Ponce, and II-III in Guayanilla, Lajas. This follows a week of aftershocks in this area which included events of M 4.9 and 5.0  on December 28-29, 2019. At the time this summary noted in this regard:

 

"The last earthquake within about 150 km of today's epicenter with M>=5 occurred as an M 5.3 on December 17, 2011, part of a series including an M 5.2 on December 17, 2011 and an M 5.0 on December 24, 2010. When an M 4.5 hit Puerto Rico on December 17 this summary noted:

 

"A swarm of minor earthquakes occurred in the area of Puerto Rico today. While these not include any moderate events, they may indicate a high level of stress at this epicenter. Puerto Rico often sees a spike in seismicity in mid-December so this is not a surprising development." (December 17, 29 2019)

 

 

O: 31DEC2019 16:16:46  17.9N   66.8W ML=3.1  EMSC   PUERTO RICO REGION           

O: 31DEC2019 23:07:43  17.9N   66.8W mb=4.6  EMSC   PUERTO RICO REGION           

O: 31DEC2019 11:03:44  17.9N   66.9W mb=3.9  EMSC   PUERTO RICO REGION           

P: 31DEC2019 120791    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 in the central Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last event in the central Andreanof Islands with M>=4.8 occurred as an M 6.0 on December 2, 2019 and an M 6.3 on November 24, 2019 is today's event is probably a regional aftershock of these. Forecast 120897 had expected today's event within this region was likely around December 31.

 

O:  1JAN2020 03:20:28  51.7N  176.7W mw=4.8  ANSS   SSW of Adak Alaska           

O: 01JAN2020 03:20:27  51.6N  176.7W Mw=4.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

P: 31DEC2019 120897    52.4N  174.3W 3.5-4.8 AABAA  Andreanoff Isls, Aleutians 

 

The strongest earthquake in the world today was an M 5.1 near the east coast of Kamchatka. NEIC reported this earthquake of M 5.1 off eastern Kamchatka  was felt with intensity II-III in the area(s) of eastern Kamchatka at Mohovaja and Jelizovo, Russia. This continues an active period near this epicenter which may be related to volcanism in the region. The last earthquake of stronger magnitude in the area within about 150 km of this epicenter was an M 6.2 to the south of this on March 28, 2019. But the current active period began north of this on December 22 with an M 5.4 on December 23, 2019. Forecast 120901 had expected today's event within about 25 km of the epicenter was likely around December 31.

 

O: 01JAN2020 03:53:29  52.8N  159.0E mb=5.1  EMSC   NEAR EAST COAST OF KAMCHATKA

O:  1JAN2020 03:53:29  52.7N  159.1E mb=5.1  ANSS   SE of Petropavlovsk-Kamchatski

P: 31DEC2019 120901    53.0N  159.0E 4.0-5.6 AAAAA  Kamchatka                  

 

MODERATE QUAKES SHAKE KASHMIR, PAKISTAN

 

EARTHQUAKE SUMMARY FOR DECEMBER 30, 2019

 

The strongest earthquake in the world today was an M 5.4 in Northwestern Kashmir, Pakistan. It was part of a series of moderate quakes - foreshocks and aftershocks - in the area. The M 5.4 was reported in Pakistan with intensity VI at Gilgit and Sialkot, Punjab, Pakistan; V in Hunza and III in Islamabad. NEIC reported an aftershock of M 4.5 in Northwestern Kashmir, Pakistan  was felt with intensity II-III in the area(s) of Northwestern Kashmir, Pakistan at Gilgit.

The event of M 5.4 is the strongest within Pakistan within about 200 km of this epicenter since an M 5.4 on October 1, 2016. A major quake of M 7.6 on October 8, 2005 did considerable damage and loss of life to the southwest of today's epicenter. Forecast 120837 had expected today's activity within about 50 km of the epicenters was likely around December 28. This activity is at 107 degrees from the M 7.1 in Ridgecrest, California and may have been promoted by energy from that source.

 

O: 31DEC2019 00:52:50  35.5N   74.7E mb=4.2  EMSC   NORTHWESTERN KASHMIR

O: 30DEC2019 17:50:01  35.5N   74.8E mb=5.1  EMSC   NORTHWESTERN KASHMIR

O: 30DEC2019 19:20:16  35.6N   74.6E mb=4.5  EMSC   NORTHWESTERN KASHMIR

O: 30DEC2019 17:12:33  35.7N   74.5E mb=4.6  EMSC   NORTHWESTERN KASHMIR

O: 30DEC2019 17:18:58  35.5N   74.7E Mw=5.4  EMSC   NORTHWESTERN KASHMIR         

P: 28DEC2019 120837    35.0N   75.0E 3.8-5.1 AAAAA  Northern India             

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 followed by an M 3.4 in Northern Alaska. These were not reported felt in this remote region. The M 3.7 is the strongest within about 200 km of this epicenter since an M 5.3 on October 27, 2018, but this is not part of the continuing aftershock series in the general region. Forecast 120917 had expected regional seismicity at the end of December south of these epicenters.

 

O: 30DEC2019 14:04:39  65.8N  150.9W ML=3.4  EMSC   NORTHERN ALASKA              

O: 30DEC2019 13:23:01  65.8N  150.9W ML=3.7  EMSC   NORTHERN ALASKA              

P: 31DEC2019 120917    62.8N  149.1W 3.2-4.9 ACAAA  Central Alaska             

 

An unusual earthquake of M 4.5 also rocked regions of Bulgaria today.  This epicenter is east of the recent activity in Albania but may be part of the same regional activation. While Bulgaria does experience light to moderate earthquakes frequently this is the strongest event in Bulgaria within about 150 km of this epicenter in more than two years since an M 4.6 on November 26, 2017. A moderately strong earthquake hit the region with M 5.5-5.6 on May 22, 2012. Forecasts 120865 and 120811 had expected regional moderate seismicity at the end of December.

 

O: 30DEC2019 18:01:41  42.2N   23.5E mb=4.5  EMSC   BULGARIA                      

P: 24DEC2019 120865    42.0N   19.0E 3.0-4.8 CACAA  Adriatic Sea               

P: 28DEC2019 120811    38.0N   24.0E 3.0-4.4 ACAAA  Aegean Sea                 

 

 

 

 

MODERATE QUAKE IN OKLAHOMA PROBABLY RELATED TO STRONG TIDAL STRESSES

 

EARTHQUAKE SUMMARY FOR DECEMBER 29, 2019

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in Oklahoma. NEIC reported maximum intensit V in Wakita, Oklahoma with IV in Nash. Intensity II-III was felt in Oklahoma at Enid, Ponba City, and in Kansas at Anthony, Arkansas City, Wichita and Rose Hill. This region often sees enhanced seismicity near the times of full and new moon alignments and today's event may have been promoted by the new moon of December 26 as noted in previous issues of this summary:

 

"The new moon will arrive on December 26, 2019 at 05:13 UT. Longitudes which are anti-solar at this time (at local solar midnight) are centered at about 78 West while those which are sub-solar (at local solar noon) are near 102 East longitude. As with the previous full moon which occurred at 05:12 UT the maximum tidal effects with this new moon should occur as described with the full moon as:

 

"The full moon arrived on December 12, 2019 at 05:12 UT. Longitudes which are anti-solar at this time are near 75 West while those sub-solar are near 105 East longitude.  In the west these include most of western South America, the Caribbean and Central America.  In the east areas most affected by strong tides associated with this alignment are in eastern Asia (the Philippines) and Indonesia. These areas are active and global seismicity is expected to be enhanced for the next week. While these areas represent maximum tidal stresses associated with this full moon, many other areas can also be triggered by strong tidal stresses. These may see maximum seismicity near local solar noon or midnight. The next lunar eclipse will occur January 10, 2020 and be visible in Europe, Africa, Asia and Australia. The last luna eclipse occurred July 16, 2019 and was associated with the largest earthquake in the world in the past half year - an M 7.3 on July 14, 2019. The last solar eclipse occurred July 2, 2019 and was followed by the remarkable activation of the western edge of the North American Plate beginning in Alaska and moving to the south over the next several days and ending with the M 7.1 earthquake in Ridgecrest, California on July 6, 2019." (December 10-16, 22-24, 2019)

 

In May with the M 4.4 this summary noted:

 

"As often occurs, Oklahoma saw enhanced seismic activity today with the strongest in a series of events of M 3.4. It is common for the area to become activated at times of full moons when tidal forces are strong and can affect ground water significantly. At M 3.4, this is the strongest earthquake within about 100 km of this epicenter since an M 3.4 on February 28 and an M 3.8 on February 26, 2019. Forecast 115982 had expected today's activity was likely within about 100 km of these epicenters around May 17." (May 16-17, 2019)

 

Only two other events of M>=4.0 have occurred in Oklahoma in the past year-and-a-half - an M 4.4 on May 17, 2019 and an M 4.0 on January 16, 2019. Forecast 120856 had expected light earthquakes in Oklahoma at the end of December.

 

O: 30DEC2019 05:57:54  36.9N   97.9W mb=4.1  EMSC   OKLAHOMA                     

P: 30DEC2019 120856    35.0N   97.0W 2.0-3.9 ABAAA  Southern Plains            

 

Light earthquakes continued today in Southern Puerto Rico. Some of these were reported felt with intensity as high as IV in Puerto Rico at Ensenada, Guanica, Ponce, San Geman, Cabo Rojo, Coto Laurel, Camuy (IV), Arecibo (IV) and Barranquitas. and Guayanilla.  Forecast 120791 had expected this activity within about 25 km was likely around December 31.

 

O: 30DEC2019 01:45:36  17.9N   66.8W ML=3.4  EMSC   PUERTO RICO REGION           

O: 29DEC2019 11:26:44  17.9N   66.8W Md=3.0  EMSC   PUERTO RICO REGION           

O: 30DEC2019 01:59:00  17.9N   66.8W Md=3.0  EMSC   PUERTO RICO REGION            

P: 31DEC2019 120791    18.0N   67.0W 3.4-4.8 AAAAA  Puerto Rico                

 

A moderate earthquake of M 5.1 hit southwest of Africa today. It was not reported felt in this remote area. The epicenter is located at the antipode of the Fox Islands, Aleutians at 53N 169W and this area could see moderate enhancement following the earthquake south of Africa.

 

O: 29DEC2019 18:24:41  52.8S   11.5E mb=5.1  EMSC   SOUTHWEST OF AFRICA          

 

The strongest earthquake in the world today was an M 5.2 in the area of Mindanao, Philippines. This area has been active for several months with strong earthquake monthly surrounding the region. Today's event was not reported felt. Forecast 120744 had expected today's activity to the north at the end of December.

 

O: 29DEC2019 13:18:03   4.5N  125.2E mb=4.8  EMSC   KEPULAUAN SANGIHE, INDONESIA 

O: 29DEC2019 12:03:53   4.6N  125.4E mb=4.8  EMSC   KEPULAUAN SANGIHE, INDONESIA 

O: 29DEC2019 09:12:15   4.7N  125.5E mb=5.2  EMSC   KEPULAUAN SANGIHE, INDONESIA 

P: 25DEC2019 120744     6.0N  125.0E 4.0-5.3 BBAAA  Mindanao, Philippines      

 

MODERATE SEISMICITY IN PUERTO RICO

 

EARTHQUAKE SUMMARY FOR DECEMBER 28, 2019

 

An earthquake of M 5.0 was widely felt in southern and western Puerto Rico today. It was followed by a strong aftershock series. The mainshock was reported with intensity VI in Sabana Grande; V in Guanica, Ensenada, Guayanilla, Ponce; IV in Yauco, Penuelas, and III in Lajas, Puerto Rico. NEIC reported an aftershock of M 3.6 in Puerto Rico was felt with intensity II-III in the area(s) of Puerto Rico in Guanica, Guayanilla, Rauco, Penuelas, Lajas, Pone, Cabo Rojo; IV in Sabana Grande and V in Ponce. An extensive series of light aftershocks were also felt with intensity up to IV-V in Cabo Rojo and Mayaguez. The mainshock was preceded by a similar series of foreshocks including an M 4.7 and other moderate quakes. This activity followed an M 4.7 shock north of Puerto Rico earlier in the day. It was reported felt with intensity II-III in Saint Thomas, Virgin Islands and in Puerto Rico at Fajardo, Ceiba and Vega Baja.

These events may related to the new moon of December 26 which occurred near the longitude of Puerto Rico and probably helped promoted this activity at this time. This summary had noted this in previous issues as:

 

"The new moon arrived on December 26, 2019 at 05:13 UT. Longitudes which are anti-solar at this time (at local solar midnight) are centered at about 78 West while those which are sub-solar (at local solar noon) are near 102 East longitude. As with the previous full moon which occurred at 05:12 UT the maximum tidal effects with this new moon should occur as described with the full moon as:

 

"The full moon arrived on December 12, 2019 at 05:12 UT. Longitudes which are anti-solar at this time are near 75 West while those sub-solar are near 105 East longitude.  In the west these include most of western South America, the Caribbean and Central America.  In the east areas most affected by strong tides associated with this alignment are in eastern Asia (the Philippines) and Indonesia. These areas are active and global seismicity is expected to be enhanced for the next week. While these areas represent maximum tidal stresses associated with this full moon, many other areas can also be triggered by strong tidal stresses. These may see maximum seismicity near local solar noon or midnight. The next lunar eclipse will occur January 10, 2020 and be visible in Europe, Africa, Asia and Australia. The last luna eclipse occurred July 16, 2019 and was associated with the largest earthquake in the world in the past half year - an M 7.3 on July 14, 2019. The last solar eclipse occurred July 2, 2019 and was followed by the remarkable activation of the western edge of the North American Plate beginning in Alaska and moving to the south over the next several days and ending with the M 7.1 earthquake in Ridgecrest, California on July 6, 2019." (December 10-16, 2019) (December 23-28, 2019)

 

The last earthquake within about 150 km of today's epicenter with M>=5 occurred as an M 5.3 on December 17, 2011, part of a series including an M 5.2 on December 17, 2011 and an M 5.0 on December 24, 2010. When an M 4.5 hit Puerto Rico on December 17 this summary noted:

 

"A swarm of minor earthquakes occurred in the area of Puerto Rico today. While these not include any moderate events, they may indicate a high level of stress at this epicenter. Puerto Rico often sees a spike in seismicity in mid-December so this is not a surprising development." (December 17, 2019)

 

O: 28DEC2019 22:46:26  17.9N   66.8W Md=3.0  EMSC   PUERTO RICO REGION

O: 29DEC2019 00:34:01  17.9N   66.8W Ml=3.5  EMSC   PUERTO RICO REGION

O: 29DEC2019 01:21:14  17.9N   66.8W Mw=4.9  EMSC   PUERTO RICO REGION

O: 29DEC2019 01:06:00  17.9N   66.8W Mw=5.0  EMSC   PUERTO RICO REGION

O: 28DEC2019 23:35:59  17.9N   66.8W mb=3.8  EMSC   PUERTO RICO REGION

O: 29DEC2019 00:06:39  17.9N   66.8W mb=4.3  EMSC   PUERTO RICO REGION

O: 29DEC2019 06:28:49  17.9N   66.9W ML=3.1  EMSC   PUERTO RICO REGION

O: 29DEC2019 02:43:01  17.9N   66.9W Md=3.0  EMSC   PUERTO RICO REGION

O: 29DEC2019 05:49:07  17.9N   66.9W Md=3.5  EMSC   PUERTO RICO REGION

O: 28DEC2019 22:35:38  17.9N   66.9W Mw=4.8  EMSC   PUERTO RICO REGION           

P: 31DEC2019 120791    18.0N   67.0W 3.4-4.8 BAAAA  Puerto Rico                

 

O: 28DEC2019 07:06:23  19.0N   65.4W mb=4.7  EMSC   PUERTO RICO REGION           

P: 23DEC2019 120781    19.0N   65.0W 3.0-4.9 BAAAA  Leeward Islands            

 

The strongest earthquake in the world today was an M 5.4-5.5 in the Prince Edward Islands region of the South Indian Ocean. It was not reported felt in this remote area. This is the largest earthquake  within about 250 km of this epicenter since an M 5.7 on October 23, 2015 and an M 5.6 on November 9, 2009 more than 10 years ago. Forecast 120959 had expected an earthquake with magnitude up to M 5.4 in this region at the end of December.

 

O: 28DEC2019 15:36:37  44.6S   37.1E mb=5.4  EMSC   PRINCE EDWARD ISLANDS REGION 

O: 28DEC2019 15:36:35  44.6S   37.1E mb=5.5  ANSS   PRINCE EDWARD ISLANDS REGION 

P: 24DEC2019 120959    41.0S   43.0E 4.0-5.4 BCCAA  So. Indian Ocean           

 

The antipodal area of the Prince Edward Island quake today is located of the coast of Oregon. The largest earthquakes in the U. S. or Canada today struck in this area. These included an M 4.3 and M 3.9  near the Oregon-California border and an M 3.0 north of this. The M 4.3 and M 3.9 were the largest within about 100 km of these epicenters since events of 5.2 on October 28, 2019 and M 4.3 on May 1, 2019.  Forecasts 120885 and 120886 had expected today's activity was likely around December 24-28 within about 50 km of these epicenters. Today's activity may be related to the strong swarm near Vancouver Island, Canada of December 23-25, w019.

 

NEIC reported this earthquake of M 4.3  off the coast of Oregon  was felt with intensity II-III in the area(s) off the coast of Oregon at Brookings, Eugene and Bend, Oregon. An M 3.9 aftershocks was reported felt in the same general area.

 

O: 28DEC2019 10:24:59  42.0N  126.1W Mw=4.3  EMSC   OFF COAST OF OREGON          

P: 28DEC2019 120885    42.1N  126.9W 3.0-4.3 AAAAA  Off Coast of Oregon        

 

O: 28DEC2019 11:03:48  42.0N  126.1W mb=3.9  EMSC   OFF COAST OF OREGON          

O: 28DEC2019 20:07:32  42.0N  126.2W ML=2.7  EMSC   OFF COAST OF OREGON          

O: 28DEC2019 15:36:38  43.3N  127.0W ML=3.0  EMSC   OFF COAST OF OREGON          

P: 24DEC2019 120886    43.1N  126.5W 3.0-4.5 BAAAA  Off Coast of Oregon        

 

ENHANCED SEISMICITY CONTINUES IN KAMCHATKA AND SOUTH SANDWICH ISLANDS

 

EARTHQUAKE SUMMARY FOR DECEMBER 27, 2019

 

It was a relatively quiet day in global seismicity today. The strongest earthquakes occurred in the near antipodal regions of Kamchatka and the South Sandwich Islands. Both have been active at this magnitude level over the past several days. Antipodal activity in these two regions is fairly common and may be related to high tides associated with the new moon of December 26. Forecasts 120899 and 120966 had expected this activity at the end of December.

 

O: 28DEC2019 02:34:30  58.9N  158.8E mb=5.1  EMSC   KAMCHATKA PENINSULA, RUSSIA  

O: 28DEC2019 04:32:05  58.9N  159.1E mb=4.3  EMSC   KAMCHATKA PENINSULA, RUSSIA  

O: 27DEC2019 08:57:47  59.0N  158.9E mb=4.6  EMSC   KAMCHATKA PENINSULA, RUSSIA  

P: 31DEC2019 120899    56.0N  160.0E 4.0-5.3 BCAAA  E. of Kamchatka            

 

O: 28DEC2019 04:14:52  55.8S   27.2W mb=4.9  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 25DEC2019 120966    57.0S   25.0W 4.0-5.8 BBBAA  So. Sandwich Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the central Rat Islands, Aleutians, Alaska. It was not reported felt in this remote region. This is the strongest earthquake within about 200 km of this epicenter since an M 5.1 on March 5, 2019. Forecast 120905 had expected today's event was likely around December 31.

 

 

O: 27DEC2019 21:43:32  51.2N  175.9E mb=4.9  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 31DEC2019 120905    51.0N  178.0E 4.0-5.5 BABAA  Rat Islands                

 

An earthquake of M 5.0 occurred today in eastern Turkey. NEIC reported this earthquake of M 4.9 in  Eastern Turkey was felt with intensity II-III in the area(s) of Eastern Turkey at Elazig. This is the strongest earthquake in this region since an M 5.3 on April 4, 2019 and a similar event a year earlier on April 24, 2018. Forecast 120860 had expected today's activity within about 100 km was likely around December 25.

 

O: 27DEC2019 07:02:26  38.3N   39.1E mb=5.0  EMSC   EASTERN TURKEY               

P: 25DEC2019 120860    39.0N   40.0E 3.5-4.9 AAAAA  Turkey                     

 

PANAY, PHILIPPINES QUAKE TRIGGERED BY TYPHOON PHANFONE

 

EARTHQUAKE SUMMARY FOR DECEMBER 26, 2019

 

A moderate earthquake shook central Philippines in the Panay region today. It was reported by NEIC to have been felt with intensity V in Passi, and IV in Badlan and Roxas, Western Visayas, Philippines. Lesser shaking in the Western Visayas occurred in Janiuay, San Dionisio, Daan Banua, Ungla, Imband, Nabitasan and Pakiad. The event occurred as Typhoon Phanfone was making landfall in the area of the epicenter. and was likely triggered by stresses from this storm as expected in previous issues of this summary:

 

"TYPH  PHANFONE 2019-12-27  00:00 UT  11.8N  122.4E  115 kts  Central Philippines Typhoon Phanfone (30W) continued today in the area of the central Philippines with winds up to 115 kts. It is expected to track to the west and to make landfall the Philippines around December 24-25. Seismicity is expected to be elevated during this time in the Philippines." (December 26, 2019) 

 

The last earthquake within about 150 km of the epicenter in Panay, Philippines with M>=5 was an M 5.7 on May 4, 2019 and prior to that an M 5.4 on August 15, 2016. Most activity at this magnitude level in recent years has occurred about 300 km to the east of today's epicenter. Forecast 120782 had expected today's activity within this area was likely around December 24-25. A smaller M 4.2 north of this had been expected in forecast 120782.

 

O: 26DEC2019 12:19:51  11.2N  122.7E mb=5.0  EMSC   PANAY, PHILIPPINES           

P: 24DEC2019 120782    12.0N  126.0E 3.5-4.8 AACAA  Luzon, Philippines         

P: 25DEC2019 120782    14.0N  121.0E 3.5-4.8 ACBAA  Luzon, Philippines         

 

O: 26DEC2019 21:24:49  14.7N  123.9E ML=4.2  EMSC   LUZON, PHILIPPINES           

P: 25DEC2019 120782    14.0N  121.0E 3.5-4.8 AABAA  Luzon, Philippines         

 

The strongest earthquakes in the world today were an M 5.3 in New Britain and an M 5.0 in Panay, Philippines and an M 5.0 in Fiji. The Panay event appears to have been promoted by stresses associated with Typhoon Phanfone as discussed above. The event in Fiji was also probably related to a meteorological storm as previously noted in this summary:

 

"A tropical cyclone may be forming north of Vanuatu and Fiji. This system is currently located at 8S 176E with winds up to 25 kts and moving to the south at 4 kts. It may impact Tonga in several days enhancing regional seismicity as it moves through the area." (December 25-26, 2019)

 

Forecast 120935 had expected today's activity within about 50 km of the epicenters was likely around December 27.

 

O: 26DEC2019 19:04:30  17.5S  178.7W mb=5.0  EMSC   FIJI REGION                  

O: 27DEC2019 05:42:16  18.0S  178.5W mb=4.5  EMSC   FIJI REGION                  

P: 27DEC2019 120935    18.0S  179.0W 4.0-5.5 AAAAA  Tonga Islands              

 

 

NEIC reported the earthquake of M 5.2 in New Britain, PNG  was felt with intensity II-III in the area(s) of New Britain, PNG At Kimbe. Forecast 120758 had expected activity in this area at the end of December.

 

O: 26DEC2019 09:24:35   5.5S  150.8E mb=5.3  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 31DEC2019 120758     6.0S  149.0E 4.0-5.3 BABAA  New Ireland                

 

A series of light, but unusual earthquakes occurred in eastern Canada today. These event in Ontario (M 1.6), James Bay and Southampton, Nunavut (M 2.9, 2.9); Manitoba, Canada (M 3.2, 2.9) and Baffin Bay (M 3.0) are near the longitude of maximum tidal stress associated with today's new moon and may have been promoted by the new moon. These events were not reported felt but those in Nunavut had been forecast in #120690 and 120923.

 

O: 26DEC2019 19:36:52  54.5N   80.6W ML=2.9  EMSC   JAMES BAY, NUNAVUT, CANADA   

O: 26DEC2019 19:36:52  54.5N   80.6W MB=2.9  ECAN Nunavut, Canada

 

O: 26DEC2019 23:55:33  63.1N   86.1W ML=2.9  EMSC   SOUTHAMPTON ISL, NUNAVUT, CANA

O: 26DEC2019 23:55:33  63.1N   86.1W MB=2.9  ECAN Coral Harbour, NU   

P: 15DEC2019 120690    64.0N   87.0W 2.5-3.8 DAAAA  Nunavit/Hudson Bay, Canada 

 

O: 26DEC2019 22:51:45  57.8N   90.5W ML=2.9  EMSC   MANITOBA, CANADA             

O: 26DEC2019 22:51:45  57.8N   90.5W MB=2.9  ECAN Manitoba      

O: 26DEC2019 22:36:13  57.8N   90.5W MB=3.2  ECAN Manitoba

O: 26DEC2019 22:36:13  57.8N   90.5W ML=3.2  EMSC   MANITOBA, CANADA             

 

O: 27DEC2019 03:46:44  72.4N   73.1W MB=3.0  ECAN Pond Inlet, NU   

O: 27DEC2019 03:46:44  72.4N   73.1W ML=3.0  EMSC   BAFFIN BAY                   

P: 27DEC2019 120923    73.3N   73.5W 2.5-3.8 AAAAA  Baffin/Davis Strait Canada 

 

O: 26DEC2019 23:22:51  49.9N   91.0W MB=1.6  ECAN Sioux Lookout, ON              

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in the Mammoth Lakes region of the California-Nevada border.  NEIC reported this earthquake of M 4.0 in Central California was felt with intensity II-III in the area(s) of California at Tollhouse (IV); Mammoth Lakes, June Lake, Bishop, Shaver Lake, Oakhurst, Yosemite National Bark, Fish Camp, El Portal and Mariposa.  The last earthquake within this area of Mammoth Lakes within about 50 km of this epicenter was an M 4.0 on August 12, 2017 and of M 4.0 on December 14, 2016. The last of M>4 was an M 4.3 more than three years ago on February 16, 2016.  Forecast 120813 had expected today's event was likely within about 25 km of this epicenter around December 27.

 

O: 26DEC2019 19:48:23  37.6N  118.8W ML=4.0  EMSC   CENTRAL CALIFORNIA           

P: 27DEC2019 120813    37.4N  118.6W 2.5-4.3 AAAAA  California/Nevada area     

 

 

STRONG M 6.1 IN EAST PACIFIC RISE PROBABLY PROMOTED BY TIDAL STRESSES

 

EARTHQUAKE SUMMARY FOR DECEMBER 26, 2019

 

An earthquake of M 6.1 on the East Pacific Rise today was probably promoted by strong tidal stresses associated with today's new moon. It was followed by an M 4.7 aftershock.

 

"The new moon will arrive on December 26, 2019 at 05:13 UT. Longitudes which are anti-solar at this time (at local solar midnight) are centered at about 78 West while those which are sub-solar (at local solar noon) are near 102 East longitude. As with the previous full moon which occurred at 05:12 UT the maximum tidal effects with this new moon should occur as described with the full moon as:

 

"The full moon arrived on December 12, 2019 at 05:12 UT. Longitudes which are anti-solar at this time are near 75 West while those sub-solar are near 105 East longitude.  In the west these include most of western South America, the Caribbean and Central America.  In the east areas most affected by strong tides associated with this alignment are in eastern Asia (the Philippines) and Indonesia. These areas are active and global seismicity is expected to be enhanced for the next week. While these areas represent maximum tidal stresses associated with this full moon, many other areas can also be triggered by strong tidal stresses. These may see maximum seismicity near local solar noon or midnight. The next lunar eclipse will occur January 10, 2020 and be visible in Europe, Africa, Asia and Australia. The last luna eclipse occurred July 16, 2019 and was associated with the largest earthquake in the world in the past half year - an M 7.3 on July 14, 2019. The last solar eclipse occurred July 2, 2019 and was followed by the remarkable activation of the western edge of the North American Plate beginning in Alaska and moving to the south over the next several days and ending with the M 7.1 earthquake in Ridgecrest, California on July 6, 2019." (December 10-16, 22-24, 2019)

 

This event of M 6.1 occurred within about an hour of local solar noon when tidal stresses maximize with the new moon. This is the strongest earthquake within about  250 km of this epicenter since an M 6.1 on September 6, 2014 and prior to that an M 6.6 on November 28, 2004. Forecast 120712 had expected today's event within about 150 km from this epicenter was likely around December 21.

 

O: 25DEC2019 20:20:15  25.4S  115.9W Mw=6.1  EMSC   SOUTHERN EAST PACIFIC RISE   

O: 25DEC2019 11:03:22  25.5S  116.0W mb=4.6  EMSC   SOUTHERN EAST PACIFIC RISE   

P: 21DEC2019 120712    24.0S  115.0W 4.0-5.4 BBAAA  So. East Pacific Rise      

 

An earthquake of M 4.9 also hit on the other side of the southern Hemisphere. This event is located at the antipode of the Gulf of California which may see sympathetic seismicity in the next several days.

 

O: 25DEC2019 16:07:48  26.8S   67.3E mb=4.9  EMSC   INDIAN OCEAN TRIPLE JUNCTION 

 

The strongest earthquake in the U.S. or Canada today was an M 4.8-4.9 in the region west of Vancouver Island. NEIC reported it was felt with intensity IV in Sumas, Washington and II in Vancouver, British Columbia, Canada. This appears to conclude the strong swarm of events in the area over the past several days. This summary had noted this in the previous issue as:

 

"The last earthquake in the Vancouver Island area of M>=6 was an M  6.5 on July 4, 2019  with the regional seismic activation of early July, 2019. A swarm  hit southeast of today's events on October 22, 2018 (M 6.8, 6.5, 6.5) and in January,  2008 (M 6.4, 6.0 ..) and September 2013 (M 6.0, 6.0, 6.1). Forecast 120898 had expected today's activity within about 50 km of the epicenters was likely around December 25." (December 23, 2019)

 

Today's event of M 4.9 occurred at 20:38 UT. Local solar noon when tidal stresses in the area maximize is at 20:40 UT. This is a clear case of tidal triggering. Coincidentally one of the strong M 6.0 events of December 23 also occurred at local solar noon at 20:56 UT as noted in previous issues of this summary:

 

"Today's largest events were of M 6.0, 6.0 and 5.8. NEIC reported they were felt with intensity I-II in British Columbia at Port Hardy (IV), Ladysmith, Vancouver, Campbell River, Courtena, Parksville, Point Roberts, Victoria, White Rock, and possibly in Washington State at Bremerton, Linnwood, Anacortes, Sammamish, Newport, and Seattle and up to 600 km from the epicenters.  A foreshock of M 5.2 slightly closer to shore was reported felt in Gold River, British Columbia, Canada. Today's activity was probably promoted by high tidal stresses. The strongest events occurred within minutes of local solar noon, a time when such stresses maximize." (December 24, 2019)

 

O: 25DEC2019 20:38:50  50.9N  130.3W MB=4.9  ECAN of Port Hardy, BC  

O: 25DEC2019 16:25:40  50.4N  129.6W MB=3.6  ECAN of Port Alice, BC  

O: 25DEC2019 20:38:53  50.9N  130.1W mb=4.8  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 25DEC2019 120898    50.5N  130.4W 3.0-4.9 AAAAA  British Colombia           

 

A series of moderate earthquakes occurred today in the region Southeast of the Loyalty Islands. The strongest of these was an M 5.4-5.5 and was accompanied by at least six event of M>=5. This series appears to have begun with an M 5.2 which occurred at 12:23 UT. Local solar midnight, a time when tidal stresses maximize with the new moon is at 12:24 UT simultaneous with the first event of M>5 in this swarm and these stresses probably helped trigger this activity. Forecast 120941 had expected this activity to the northwest in the Loyalty Islands was likely around December 25.

 

O: 25DEC2019 10:11:42  22.0S  173.6E Mw=5.2  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 25DEC2019 12:23:14  22.0S  173.6E mb=5.2  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 25DEC2019 18:34:06  22.1S  172.6E mb=4.9  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 26DEC2019 02:06:38  22.2S  173.3E mb=5.0  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 25DEC2019 14:15:06  22.2S  173.4E mb=5.0  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 25DEC2019 18:05:28  22.4S  173.5E mb=4.9  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 25DEC2019 14:58:42  24.2S  173.9E mb=5.0  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 26DEC2019 02:16:57  21.9S  173.7E mb=5.1  EMSC   VANUATU REGION               

O: 26DEC2019 02:21:33  22.0S  173.2E mb=5.4  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O: 26DEC2019 02:21:35  22.1S  173.2E mb=5.5  ANSS   SOUTHEAST OF LOYALTY ISLANDS 

O: 25DEC2019 10:50:49  22.0S  173.5E mb=4.5  EMSC   VANUATU REGION               

O: 25DEC2019 14:58:35  22.0S  173.5E mb=4.9  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 25DEC2019 120941    21.0S  170.0E 4.0-5.3 AACAA  Loyalty Islands            

 

 

STRONG QUAKES IN WESTERN SOUTH AMERICA

 

EARTHQUAKE SUMMARY FOR DECEMBER 24, 2019

 

A series of strong earthquakes occurred along the western coast of South America today with an M 6.0 in Colombia and a second M 6.0 in Argentina. These quakes appear to have been promoted by high astronomical tides associated with tomorrow's new moon as noted in previous issues of this summary:

 

"The new moon will arrive on December 26, 2019 at 05:13 UT. Longitudes which are anti-solar at this time (at local solar midnight) are centered at about 78 West while those which are sub-solar (at local solar noon) are near 102 East longitude. As with the previous full moon which occurred at 05:12 UT the maximum tidal effects with this new moon should occur as described with the full moon as:

 

"The full moon arrived on December 12, 2019 at 05:12 UT. Longitudes which are anti-solar at this time are near 75 West while those sub-solar are near 105 East longitude.  In the west these include most of western South America, the Caribbean and Central America.  In the east areas most affected by strong tides associated with this alignment are in eastern Asia (the Philippines) and Indonesia. These areas are active and global seismicity is expected to be enhanced for the next week. While these areas represent maximum tidal stresses associated with this full moon, many other areas can also be triggered by strong tidal stresses. These may see maximum seismicity near local solar noon or midnight. The next lunar eclipse will occur January 10, 2020 and be visible in Europe, Africa, Asia and Australia. The last luna eclipse occurred July 16, 2019 and was associated with the largest earthquake in the world in the past half year - an M 7.3 on July 14, 2019. The last solar eclipse occurred July 2, 2019 and was followed by the remarkable activation of the western edge of the North American Plate beginning in Alaska and moving to the south over the next several days and ending with the M 7.1 earthquake in Ridgecrest, California on July 6, 2019." (December 10-16, 22-24, 2019)

 

 

NEIC reported an earthquake of M 6.0 in Southern Colombia  was felt with intensity II-III in the area(s) of Southern Colombia at Villavicencio, Fusagasuga, Cumaral; Lejanias; IV in Carmen de Apicala, Socha, Bogota and Girardot; V in Granada and VII at Mestas, Meta.  Aftershocks in Colombia, including an M 5.8, 5.1 and M 4.4 were felt with intensity IV in Colombia at La Calera and Funza Cundinamarca and II-III in Acacias, Villavicencio and Bogota, Colombia. No major damage was reported with these shallow  focus earthquakes south of Bogota, Colombia. The area has much oil and agricultural industry, but these apparently were unaffected by the quakes. The antipode of this activity is south of Sumatra, Indonesia at 4S 106E. Antipodal activity in this active area is not unexpected following the events in Colombia. Today's event is near the antipode of the M 6.8 in Sumatra of August 2, 2019 which may see aftershock activity in the next several days.

 

This is the strongest earthquake within about 200 km of this epicenter in Colombia since an M 6.4 more than 20 years ago on January 25, 1999 and two events of M 6.8 and M 6.4 on September 2, 1997 and December 11, 1997 respectively. No events of M>=6 have occurred within 150 km of today's epicenter in the past 30 years. Forecasts 120523 and 120739 had expected regional activity in Colombia was likely around December 13 or 25.

 

O: 25DEC2019 02:11:23   3.4N   74.0W mb=5.0  EMSC   COLOMBIA

O: 24DEC2019 19:03:54   3.5N   74.0W Mw=6.0  EMSC   COLOMBIA

O: 25DEC2019 00:25:01   3.5N   74.0W mb=4.5  EMSC   COLOMBIA

O: 24DEC2019 19:19:06   3.5N   74.1W Mw=5.7  EMSC   COLOMBIA                     

P: 13DEC2019 120523     5.0N   76.0W 4.0-5.4 DBBAA  Colombia                   

P: 25DEC2019 120739     5.0N   78.0W 4.0-5.4 ABCAA  Colombia                   

 

The earthquake of M 6.0 in Argentina was at a deep focus and was widely felt in Chile, including with intensity II in northern Chile at Iquique, Tarapaca and Vina del Mar in Central Chile. This is the strongest earthquake within about 200 km of this epicenter since an M 6.2 on February 22, 2013. Forecast 120939 had expected today's event within about 50 km was likely around December 30. Today's event is at 144 degrees from  the M 6.8 in Sumatra of August 2, 2019 and may have been promoted from energy from that source.

 

O: 24DEC2019 16:43:32  27.0S   63.4W Mw=6.0  EMSC   SANTIAGO DEL ESTERO, ARGENTINA

P: 30DEC2019 120939    27.0S   63.0W 4.0-5.5 CAAAA  Argentina                  

 

The swarm of aftershocks north of Puerto Rico also continued today at 67-68 degrees West Longitude. This follows a moderate M 4.9 in the region three days ago. Today's activity had been expected forecast 120792 at the end of December.

 

O: 24DEC2019 07:43:46  18.8N   67.3W Md=3.2  EMSC   PUERTO RICO REGION

O: 24DEC2019 08:56:53  19.0N   67.1W Md=3.2  EMSC   PUERTO RICO REGION

O: 24DEC2019 23:55:13  19.1N   67.7W Md=3.4  EMSC   PUERTO RICO REGION

O: 24DEC2019 09:55:47  19.2N   67.2W Md=3.1  EMSC   PUERTO RICO REGION

O: 24DEC2019 22:06:53  19.2N   67.7W Md=3.0  EMSC   PUERTO RICO REGION

O: 25DEC2019 00:43:52  19.2N   67.9W Md=3.2  EMSC   DOMINICAN REPUBLIC REGION

O: 24DEC2019 19:02:44  19.3N   67.4W Md=3.2  EMSC   PUERTO RICO REGION

O: 24DEC2019 23:11:36  19.3N   67.5W Md=3.3  EMSC   PUERTO RICO REGION

O: 24DEC2019 22:04:31  19.3N   67.9W Md=3.0  EMSC   DOMINICAN REPUBLIC REGION

O: 24DEC2019 07:53:17  19.4N   67.3W Md=3.4  EMSC   PUERTO RICO REGION           

P: 24DEC2019 120792    18.0N   68.0W 3.4-4.8 ABAAA  Puerto Rico                

P: 29DEC2019 120792    19.0N   67.0W 3.4-4.9 BAAAA  Puerto Rico                

 

The strongest earthquake in the world today was an M 6.3 west of Vancouver Island, Canada. It was felt with intensity II-III in British Columbia at Port Hardy, Port MacNeill, Nanaimo, Ladysmith, Whistler, Cowichan, Vancouver, Victoria, White Rock and in Seattle, Washington. This continues the strong activity in this area which began yesterday and was discussed in this summary as:

 

 

"Recent unusual activity in Alaska including events in southeastern Alaska of M 5.4 and an M 5.0 in Kodiak, Alaska yesterday is suggesting that another regional activation of the area is underway. In many ways this reflects the regional activation of early July, 2019 which ended with the M 7.1 in Ridgecrest, California: Ridgecrest, California calmed down a bit today after unusual quakes of M 3.9 there in the past several days. If this follows the July migration as it appears to be doing, activation to the north is likely to shift to the South across the region of British Columbia and eventually to the Pacific coast of the U.S. in the next several days, however." (December 22-23, 2019)

 

and

 

"Other factors which probably affected the timing of the activity in Vancouver, Canada probably included strong meteorological storms which dropped up to 12 inches on areas of the southeast U.S. and in Washington State and British Columbia and the geomagnetic storm  of December 19-20. This summary had expected this could affect areas at high and auroral latitudes (>50 degrees latitude) would see enhanced seismicity at this time as:

 

"a strong geomagnetic storm of December 18-19 may enhance global seismicity especially near the geomagnetic equator and at high latitudes. Maximum effects are expected December 22-25." (Dece3mber 18-22, 2019)

 

The last earthquake in the Vancouver Island area of M>=6 was an M  6.5 on July 4, 2019  with the regional seismic activation of early July, 2019. A swarm  hit southeast of today's events on October 22, 2018 (M 6.8, 6.5, 6.5) and in January,  2008 (M 6.4, 6.0 ..) and September 2013 (M 6.0, 6.0, 6.1). Forecast 120898 had expected today's activity within about 50 km of the epicenters was likely around December 25." (December 23, 2019)

 

Today's event off Vancouver Island was within about 25 km of forecast 120898 which had expected it around December 25. An M 4.3 in the Queen Charlotte Island area north of Vancouver was expected around December 27 in forecast 120898.

 

O: 25DEC2019 03:36:02  50.6N  129.9W Mw=6.3  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 25DEC2019 03:36:01  50.5N  130.1W MB=6.2  ECAN Port Hardy, BC  

P: 25DEC2019 120898    50.5N  130.4W 3.0-4.9 AAAAA  British Colombia           

 

O: 24DEC2019 05:32:05  53.1N  132.5W MB=4.3  ECAN Queen Charlotte Island         

P: 27DEC2019 120898    52.0N  131.0W 3.0-4.8 BBAAA  British Colombia           

 

 

STRONG QUAKES RECORDED OFF VANCOUVER ISLAND, BRITISH COLUMBIA, CANADA

 

EARTHQUAKE SUMMARY FOR DECEMBER 23, 2019

 

A series of strong earthquakes were recorded off the coast of Vancouver Island today in Canada.  This activity had been expected in the previous issue of this summary as part of the activation of western and northwestern North America as:

 

 

"Recent unusual activity in Alaska including events in southeastern Alaska of M 5.4 and an M 5.0 in Kodiak, Alaska yesterday is suggesting that another regional activation of the area is underway. In many ways this reflects the regional activation of early July, 2019 which ended with the M 7.1 in Ridgecrest, California: Ridgecrest, California calmed down a bit today after unusual quakes of M 3.9 there in the past several days. If this follows the July migration as it appears to be doing, activation to the north is likely to shift to the South across the region of British Columbia and eventually to the Pacific coast of the U.S. in the next several days, however." (December 22-23, 2019)

 

Today's largest events were of M 6.0, 6.0 and 5.8. NEIC reported they were felt with intensity I-II in British Columbia at Port Hardy (IV), Ladysmith, Vancouver, Campbell River, Courtena, Parksville, Point Roberts, Victoria, White Rock, and possibly in Washington State at Bremerton, Linnwood, Anacortes, Sammamish, Newport, and Seattle and up to 600 km from the epicenters.  A foreshock of M 5.2 slightly closer to shore was reported felt in Gold River, British Columbia, Canada. Today's activity was probably promoted by high tidal stresses. The strongest events occurred within minutes of local solar noon, a time when such stresses maximize.

 

Other factors which probably affected the timing of the activity in Vancouver, Canada probably included strong meteorological storms which dropped up to 12 inches on areas of the southeast U.S. and in Washington State and British Columbia and the geomagnetic storm  of December 19-20. This summary had expected this could affect areas at high and auroral latitudes (>50 degrees latitude) would see enhanced seismicity at this time as:

 

"a strong geomagnetic storm of December 18-19 may enhance global seismicity especially near the geomagnetic equator and at high latitudes. Maximum effects are expected December 22-25." (Dece3mber 18-22, 2019)

 

The last earthquake in the Vancouver Island area of M>=6 was an M  6.5 on July 4, 2019 with the regional seismic activation of early July, 2019. A swarm  hit southeast of today's events on October 22, 2018 (M 6.8, 6.5, 6.5) and in January,  2008 (M 6.4, 6.0 ..) and September 2013 (M 6.0, 6.0, 6.1). Forecast 120898 had expected today's activity within about 50 km of the epicenters was likely around December 25.

 

O: 23DEC2019 16:44:13  50.6N  129.8W Mw=5.2  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 23DEC2019 23:38:26  50.6N  129.9W MB=4.8  ECAN  Port Hardy, BC  

O: 23DEC2019 20:56:22  50.3N  130.1W MB=6.0  ECAN  Port Alice, BC  

O: 23DEC2019 19:49:43  50.6N  130.1W Mw=6.0  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 23DEC2019 19:13:25  50.7N  129.8W Mw=5.7  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 23DEC2019 23:38:28  50.7N  129.8W mb=4.7  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 23DEC2019 20:56:22  50.7N  129.9W Mw=6.0  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 23DEC2019 19:49:43  50.6N  130.0W MB=5.8  ECAN  Port Hardy, BC  

O: 23DEC2019 19:13:24  50.4N  130.0W MB=5.6  ECAN Port Hardy, BC   

O: 23DEC2019 16:44:10  50.3N  130.1W MB=5.1  ECAN Port Alice, BC   

P: 25DEC2019 120898    50.5N  130.4W 3.0-4.9 AAAAA  British Colombia           

 

O: 24DEC2019 05:32:05  53.1N  132.5W ML=4.3  EMSC   QUEEN CHARLOTTE ISLANDS REGION

O: 24DEC2019 05:32:05  53.1N  132.5W MB=4.3  ECAN  Queen Charlotte Is. Canada     

P: 27DEC2019 120898    52.0N  131.0W 3.0-4.8 BBAAA  British Colombia           

 

 

An earthquake of M 5.8 also occurred on the southwestern portion of the North American Plate off the southern coast of Guatemala. NEIC reported it was felt with intensity II-III in Guatemala at Tacana, San Marcos, Quetzaltenango, and Atitlan Solola. This follows an earthquake of M 5.9 on December 19 in Guatemala abut 200 km east of today's epicenter. Forecast 120552 had exoected today's event was likely within about 25 km around December 19.

 

O: 23DEC2019 18:32:22  13.7N   93.2W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

O: 23DEC2019 15:47:59  13.8N   92.8W Mw=5.8  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 19DEC2019 120552    14.0N   93.0W 3.5-5.0 BAAAA  Chiapas, Mexico            

 

MODERATELY STRONG QUAKE IN YAP, NORTH PACIFIC ASSOCIATED WITH TS PHANFONE

 

EARTHQUAKE SUMMARY FOR DECEMBER 22, 2019

 

The strongest earthquake in the world today occurred as an M 5.8 south of Guam in the region of Yap. As noted in the previous issue of this summary a tropical storm (Phanfone) south of this passed the region in the past several days:

 

"TS Phanfone (30W) formed today in the north Pacific east of the Philippines with winds up to 45 kts. It is expected to track to the west and to impact the Philippines around December 23-25. Seismicity is expected to be elevated during this time in the Philippines. A tropical cyclone may be forming north of New Guinea. This system is currently located at 5N 143E and tracking to the west at 11 kts. This may enhance seismicity to the south in New Guinea in the next several days." (December 20-22, 2019)

 

This is the strongest earthquake within about 200 km of this epicenter since an series of events in early December (8-9), 2017 which included events of M 6.4, 6.5 and 6.1. It may have been promoted by the geomagnetic storm 2-3 days ago as it lies on the geomagnetic equator. A similar geomagnetic storm was associated with the December, 2017 activity. Forecasts 125072 and 120792 had expected today's activity within about 100 km was likely around December 17-26.

 

O: 23DEC2019 06:33:41  11.5N  141.7E Mw=5.8  EMSC   STATE OF YAP, MICRONESIA     

P: 17DEC2019 120572    12.0N  141.0E 4.0-5.3 CAAAA  So. Marianas/Guam          

P: 26DEC2019 120794    11.0N  140.0E 4.0-5.3 BABAA  So. Marianas/Guam          

 

Recent unusual activity in Alaska including events in southeastern Alaska of M 5.4 and an M 5.0 in Kodiak, Alaska yesterday is suggesting that another regional activation of the area is underway. In many ways this reflects the regional activation of early July, 2019 which ended with the M 7.1 in Ridgecrest, California: Ridgecrest, California calmed down a bit today after unusual quakes of M 3.9 there in the past several days. If this follows the July migration as it appears to be doing, activation to the north is likely to shift to the South across the region of British Columbia and eventually to the Pacific coast of the U.S. in the next several days, however.

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Rat Islands. It was not reported felt in this remote area. An M 4.5 hit about 150 km to the east of today's epicenter on December 10, 2019 and prior to that as an M 5.0 to the northeast on October 5, 2019. Forecast 120673 had expected today's event within about 100 km in the Rat Islands around December 21.

 

O: 23DEC2019 00:02:55  51.3N  177.2E mb=4.4  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 21DEC2019 120673    51.0N  176.0E 4.0-5.5 AAAAA  Rat Islands                

 

The most unusual earthquake in the U.S. or Canada today was an M 2.5 in southern Wyoming. This is the strongest event within about 100 km of this epicenter since an M 2.7 on December 3, 2018 and prior to that an M 3.1 on September 23, 2018.

Forecast 120638 had expected today's event was likely around December 21 within about 100 km of the epicenter.

 

O: 22DEC2019 11:03:40  42.6N  107.8W ML=2.5  EMSC   WYOMING                      

P: 21DEC2019 120638    41.9N  108.7W 2.0-3.9 AAAAA  Colorado area              

 

MODERATE EARTHQUAKE OF M 5.0 AND ASSOCIATED QUAKES HIT KODIAK, ALASKA

 

EARTHQUAKE SUMMARY FOR DECEMBER 21, 2019

 

The strongest seismicity in the World and in the U.S. or Canada today occurred in the Kodiak Island, Region of Alaska. The largest of these was an M 4.6-5.0 but foreshocks and aftershocks of M 4.3-4.4 also occurred. The last earthquake in the Kodiak Island area within about 200 km of today's epicenters was an M 5.2 on May 11, 2017 and before that an M 5.2 on February 25, 2014 about 200 km northwest of today's epicenter. Forecast 120688 expected today's activity to the southeast was possibly around December 18.

 

O: 22DEC2019 00:57:33  56.4N  152.2W ML=3.5  EMSC   KODIAK ISLAND REGION, ALASKA

O: 22DEC2019 01:01:11  56.4N  152.2W ML=3.5  EMSC   KODIAK ISLAND REGION, ALASKA

O: 21DEC2019 23:01:01  56.4N  152.2W mb=4.4  EMSC   KODIAK ISLAND REGION, ALASKA

O: 21DEC2019 20:41:32  56.5N  152.1W mb=4.3  EMSC   KODIAK ISLAND REGION, ALASKA

O: 22DEC2019 02:44:19  56.5N  152.2W ML=3.7  EMSC   KODIAK ISLAND REGION, ALASKA

O: 21DEC2019 23:24:25  56.6N  152.2W ML=3.4  EMSC   KODIAK ISLAND REGION, ALASKA

O: 21DEC2019 22:52:37  56.8N  152.4W mb=4.6  EMSC   KODIAK ISLAND REGION, ALASKA 

O: 21DEC2019 22:52:38  56.7N  152.2W mb=5.0  ANSS   KODIAK ISLAND REGION, ALASKA 

P: 18DEC2019 120688    55.0N  150.0W 3.0-4.5 BBBAA  Gulf of  Alaska            

 

With the exception of the Kodiak Island earthquakes no other events of M>=5

were recorded in the world today, a quiet day in global seismicity.

 

The extended swarm in the Ridgecrest, California aftershock zone also continued today. The largest of today's events was an M 3.9. This summary noted this event in the previous issue as:

 

"The strongest earthquake in the U.S. or Canada today was an M 3.9 aftershock in the Ridgecrest, California zone. This follows the M 7.1 in the region on July 6, 2019. Today's event was accompanied by a series of light aftershocks and foreshocks and was felt widely in the Ridgecrest area. Aftershocks of M 3.8-3.9 hit the region most recently on November 13, 2019 and October 18, 2019 but the last of M>3.9 was an M 4.3 on August 23, 2019, nearly four months ago. Forecast 120624 had expected today's aftershock activity was likely in mid-December." (December 21, 2019)

 

NEIC reported the earthquake of M 3.9 in the Ridgecrest, California aftershock zone  was felt with intensity II-III in the area(s) of the Ridgecrest, California aftershock zone a Ridgecrest, Trona, Inyokern, Wofford, and IV in Johannesburg.

 

O: 21DEC2019 08:24:32  35.7N  117.5W Mw=3.9  EMSC   SOUTHERN CALIFORNIA

O: 22DEC2019 06:01:15  35.9N  117.7W ML=2.1  EMSC   CENTRAL CALIFORNIA

O: 21DEC2019 22:39:44  35.9N  117.7W Ml=2.5  EMSC   CENTRAL CALIFORNIA

O: 21DEC2019 22:33:13  35.7N  117.5W ML=2.3  EMSC   SOUTHERN CALIFORNIA

O: 21DEC2019 21:18:42  36.1N  117.9W Ml=2.5  EMSC   CENTRAL CALIFORNIA

O: 21DEC2019 21:00:58  36.1N  117.9W Ml=2.0  EMSC   CENTRAL CALIFORNIA

O: 21DEC2019 20:41:26  36.1N  117.9W Ml=2.3  EMSC   CENTRAL CALIFORNIA

O: 21DEC2019 18:57:25  35.9N  117.7W Ml=2.4  EMSC   CENTRAL CALIFORNIA

O: 21DEC2019 18:19:36  35.9N  117.7W Ml=2.0  EMSC   CENTRAL CALIFORNIA

O: 21DEC2019 17:45:21  35.9N  117.7W Ml=2.3  EMSC   CENTRAL CALIFORNIA

O: 21DEC2019 17:35:16  35.9N  117.7W Ml=2.4  EMSC   CENTRAL CALIFORNIA

O: 21DEC2019 08:05:55  35.9N  117.7W Ml=2.6  EMSC   CENTRAL CALIFORNIA

O: 21DEC2019 07:11:01  35.9N  117.7W Ml=2.1  EMSC   CENTRAL CALIFORNIA

O: 21DEC2019 06:32:05  35.7N  117.5W Ml=2.5  EMSC   SOUTHERN CALIFORNIA

O: 21DEC2019 06:12:46  35.9N  117.7W Ml=2.4  EMSC   CENTRAL CALIFORNIA

O: 21DEC2019 08:05:55  35.9N  117.7W Ml=2.6  EMSC   CENTRAL CALIFORNIA           

P: 16DEC2019 120624    35.9N  117.7W 2.5-4.4 BAAAA  So. California