MODERATELY STRONG QUAKE SHAKES VANCOUVER ISLAND, BRITISH COLUMBIA, CANADA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 17, 2023

 

The strongest earthquake in the world today was an M 5.6-5.9 west of Vancouver Island, British Columbia, Canada. NEIC reported it was felt with light shaking I-III in British Columbia at Parksville, Gibsons, Vancouver and perhaps as far as Oregon and Northern California. Foreshocks of M 4.5 and 4.3 preceded the mainshock and may have been felt lightly in the epicentral area.

 

This enhanced seismicity in British Columbia, Canada had been anticipated in this summary in the past several issues. It began two days ago with a strong series of moderate quakes as described at the time in this summary:

 

 

"A series of light to moderate earthquake with maximum events of M 4.2 occurred today in the region near Vancouver, British Columbia, Canada. These events centered near local solar noon and were probably promoted by the new moon tidal stresses today which maximized near this time as noted in this and previous issues of this summary:

 

"The New Moon will arrive at 01:40 UT on September 15. Longitudes which will be at local solar midnight at this time are near 25 West while those at local solar noon are near 155 East. These include the same areas identified as probable area of tidal triggering with the Full Moon of August 31. This forecast identified these at the time as: "These zones include the central Atlantic and Iceland and western Europe in the west and the Kuril Islands, Japan and portions of eastern Indonesia and the Vanuatu Islands in the east. These areas are the most likely to see tidal triggering in the next week. Such events often occur near local solar midnight and noon. A major earthquake is considered likely with this full moon in the next week." (September 13-15, 2023)

 

and continued in the previous issues of this summary as:

 

 

"The strong swarm of earthquakes yesterday in the area of Vancouver Island, British Columbia ceased abruptly today with only a minor earthquake recorded in the area. This swarm coincided with landfall of Hurricane Lee in Maine and Nova Scotia, Canada. This storm has been called a summer "nor'easter" because of its strength and characteristics. This summary has taken a clear stance on the likely connection between nor'easters and coincidental major activity in the northwestern U.S. and southwestern Canada as typified by the summary of January 29, 2022:

 

 

" ... a major nor'easter is beginning to progress up the eastern coast of the U.S. It may hit the Boston area with record snows today and on Saturday, January 29, 2022. Such nor'easters are often associated with a strong enhancement of seismicity along the western North American tectonic plate. A precautionary seismic watch is being called by this summary for this region through February 2, 2022." (January 27, 2022)

 

and more recently:

 

"The strongest earthquakes in the U.S. or Canada today occurred as an M 4.3  near Vancouver Island and as an M 3.8 in the Queen Charlotte Islands area of British Columbia.  These were not reported felt. This may related to a  nor'easter hitting the northeastern U.S. at this time. Larger earthquakes in the Vancouver and Queen Charlotte Island area of Canada often occur in conjunction with strong nor'easters on the opposite side of the North American Plate." (March 14, 2023)

 

A stronger earthquake in the Vancouver or Queen Charlotte region is possible with landfall of Hurricane Lee today in Nova Scotia and Newfoundland.

 

Hurricane Lee has been described in this and previous issues of this summary as:

 

"Hurricane Lee continued today in the area of north of Nova Scotia with winds up to 50 kts (category 1 hurricane). It is expected to track to the north and east and may enhance seismicity in the Northeast U.S and Quebec, Canada as it makes landfall in that area around  of Nova Scotia on September 17 in the next week. Interactions with the North American Plate may also trigger moderate to strong seismic enhancement in areas of coastal western Canada and northwestern U.S. at this time. Coastal flooding in Maine is considered marginal by NHC but more intense effects are possible along the coasts of eastern Canada." (September 16-17, 2023)

 

The last earthquake of M>=5.9  within about 100 km of today's epicenters in Vancouver was an M 6.3 on December 25, 2019, part of a series of events in the area that started with two of M 6.0 on December 23, 2019. At the time this summary noted:

 

 

"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.

 

...

 

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)." (December 23, 2019)

 

An M 6.0 was also recorded in the Vancouver area about 150 km southeast of today's event on April 13, 2023.

 

Forecast 156546 had expected today's event within about 10 km was likely in mid-September.

 

 

O: 17SEP2023 11:28:13  50.8N  130.2W Mw=5.6  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 17SEP2023 11:28:08  50.6N  130.5W MB=5.9  ECAN of Port Hardy, BC  

O: 17SEP2023 15:19:50  50.8N  130.3W ML=4.3  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 17SEP2023 15:19:49  50.7N  130.5W MB=4.3  ECAN of Port Hardy, BC  

O: 17SEP2023 09:58:57  50.6N  130.5W MB=5.0  ECAN of Port Hardy, BC  

O: 17SEP2023 09:59:03  50.8N  129.8W Mw=4.5  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 13SEP2023 156546    50.5N  130.4W 3.0-4.9 BAAAA  British Colombia           

 

An unusually large M 5.1 struck the area of Northern Italy today. NEIC reported it was felt with maximum intensity IV in San Godenzo, Toscana, Brisighella Emilia-Romagna, Castrocaro Terme and Terra del Sole and Forli with lesser shaking in Borgo, San Lornzo, Scarperia, Riolo Terme, Pontassieve and Imola among others. This is the strongest earthquake in northern Italy within about 200 km of this epicenter since an M 5.6 about 200 km to the east on November 9, 2022 but the last within about 100 km of today's epicenter was an 6.1 on May 20, 2012 and an M 5.5  aftershock on May 29, 2012. At the time of the May 20, 2012 event this summary noted:

 

"Three strong earthquakes of M 5.8-6.1 hit in the world today and were probably triggered by tidal forces associated with the upcoming solar eclipse which will occur later today. The most widely felt and damaging of today's events occurred as an M 6.1 in  northern Italy ...

 

The last earthquake in northern Italy of similar or larger magnitude (and the only such event in the past 22 years) was an M 6.4 on September 26, 1997." (May 20, 2012)

 

Today's event in Italy occurred near Florence but was reported by the press to have not caused any significant damage in the area. Forecast 156503 had expected today's event within about 100 km was likely around September 15.

 

O: 18SEP2023 03:10:14  44.0N   11.7E Mw=5.1  ANSS   NORTHERN ITALY               

O: 18SEP2023 03:10:14  44.0N   11.6E Mw=5.1  EMSC   NORTHERN ITALY               

P: 15SEP2023 156503    45.0N   12.0E 3.0-5.2 BAAAA  Austria                    

 

LANDFALL OF HURRICANE LEE IN NOVA SCOTIA ASSOCIATED WITH VANCOUVER EARTHQUAKES

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 16, 2023

 

The strong swarm of earthquakes yesterday in the area of Vancouver Island, British Columbia ceased abruptly today with only a minor earthquake recorded in the area. This swarm coincided with landfall of Hurricane Lee in Maine and Nova Scotia, Canada. This storm has been called a summer "nor'easter" because of its strength and characteristics. This summary has taken a clear stance on the likely connection between nor'easters and coincidental major activity in the northwestern U.S. and southwestern Canada as typified by the summary of January 29, 2022:

 

 

" ... a major nor'easter is beginning to progress up the eastern coast of the U.S. It may hit the Boston area with record snows today and on Saturday, January 29, 2022. Such nor'easters are often associated with a strong enhancement of seismicity along the western North American tectonic plate. A precautionary seismic watch is being called by this summary for this region through February 2, 2022." (January 27, 2022)

 

and more recently:

 

"The strongest earthquakes in the U.S. or Canada today occurred as an M 4.3  near Vancouver Island and as an M 3.8 in the Queen Charlotte Islands area of British Columbia.  These were not reported felt. This may related to a nor'easter hitting the northeastern U.S. at this time. Larger earthquakes in the Vancouver and Queen Charlotte Island area of Canada often occur in conjunction with strong nor'easters on the opposite side of the North American Plate." (March 14, 2023)

 

A stronger earthquake in the Vancouver or Queen Charlotte region is possible with landfall of Hurricane Lee today in Nova Scotia and Newfoundland.

 

Hurricane Lee has been described in this and previous issues of this summary as:

 

"Hurricane Lee continued today in the area of north of Nova Scotia with winds up to 50 kts (category 1 hurricane). It is expected to track to the north and east and may enhance seismicity in the Northeast U.S and Quebec, Canada as it makes landfall in that area around  of Nova Scotia on September 17 in the next week. Interactions with the North American Plate may also trigger moderate to strong seismic enhancement in areas of coastal western Canada and northwestern U.S. at this time. Coastal flooding in Maine is considered marginal by NHC but more intense effects are possible along the coasts of eastern Canada." (September 16-17, 2023)

 

The strongest earthquake in the world today was an M 5.4 in the Mid-Indian Ridge.  This is the first earthquake of this size or larger within about 200 km  of this epicenter since an M 5.6 on March 27, 2022 and an M 5.5 on November 2, 2021. Today's activity in the mid-Indian Ridge may have been promoted by antipodal energy associated with Hurricane Jova which passed over the antipode of today's event on September 5, 2023 as noted at the time in this summary:

 

"HURR  JOVA     2023-09-06  00:00 UT  13.3N  109.0W   90 kts  South of Gulf of Mexico" (September 6, 2023)

 

Forecast 156319 had expected today's event in this region was likely around

September 10.

 

O: 16SEP2023 13:47:57  13.7S   66.3E Mw=5.4  EMSC   MID-INDIAN RIDGE             

P: 10SEP2023 156319    15.0S   67.0E 4.0-5.6 CBAAA  So. Indian Ocean           

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in the Fox Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last event of significantly larger magnitude in the Fox Islands was an M 4.6 near today's epicenter on August 16, 2023. At the time this summary noted:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 4.6 in the Fox Islands, Aleutians, Alaska. It was not reported felt in this remote epicentral area. This is the strongest earthquake in the Fox Islands since an M 4.8 on July 1, 2023 and is probably a regional aftershock of that event." (August 16, 2023)

 

Like the event of August 16, today's Fox Islands earthquake occurred with the new moon near local solar noon and was probably promoted by tidal stresses with that alignment. Forecast 156550 had expected today's event in the Fox Islands was likely within about 50 km around September 17. The Fox Islands are near 103 degrees from the M 6.8 in Morocco of September 8, 2023 and may have been promoted by energy from that source. Other events at this distance today from Morocco included moderate quakes in Sumatra, the West Chile Rise and Honshu, Japan.

 

O: 16SEP2023 23:59:20  52.4N  169.4W ML=3.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 17SEP2023 156550    51.9N  169.2W 3.5-4.9 AAAAA  Fox Islands, Aleutians

     

O: 16SEP2023 19:14:14  41.2S   89.4W mb=4.8  EMSC   SOUTHEAST OF EASTER ISLAND   

P: 13SEP2023 156616    43.0S   83.0W 4.0-5.8 BBCAA  Chile Rise  

 

O: 17SEP2023 00:44:20   3.3N   97.9E ML=4.3  EMSC   NORTHERN SUMATRA, INDONESIA  

P: 12SEP2023 156376     3.0N   97.0E 4.0-5.7 BAAAA  Nicobar Islands            

 

O: 16SEP2023 18:28:21  44.9N  149.8E mb=4.5  EMSC   KURIL ISLANDS                

P: 14SEP2023 156535    45.0N  149.0E 3.5-5.5 AAAAA  So. Kurils

                  

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 6.9 in the area of Morocco September 8, 2023, where promoted seismicity is considered likely.

 

Today's projected seismicity map follows for the coming week.

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 17SEP2023 02:00:26  34.6N   99.0E mb=4.4  EMSC   SOUTHERN QINGHAI, CHINA      

P: 15SEP2023 156488    36.0N  100.0E 3.5-4.9 ABAAA  So. China                  

 

O: 17SEP2023 00:04:19  38.9N   71.7E mb=4.3  EMSC   TAJIKISTAN                    

P: 20SEP2023 156452    39.0N   72.0E 3.8-5.2 BAAAA  Hindu Kush/Pakistan        

 

O: 16SEP2023 15:56:49  55.6N  160.1E mb=4.4  EMSC   KAMCHATKA PENINSULA, RUSSIA  

P: 11SEP2023 156548    55.0N  160.0E 4.0-5.6 BAAAA  E. of Kamchatka             

 

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

 

INDONESIA AND PHILIPPINES

 

O: 16SEP2023 21:17:39   0.5S  133.2E mb=5.0  EMSC   NEAR N COAST OF PAPUA, INDONES

P: 17SEP2023 156394     2.0S  139.0E 4.0-5.4 ABCAA  West Irian, PNG            

 

O: 17SEP2023 00:44:20   3.3N   97.9E ML=4.3  EMSC   NORTHERN SUMATRA, INDONESIA  

P: 12SEP2023 156376     3.0N   97.0E 4.0-5.7 BAAAA  Nicobar Islands            

 

O: 16SEP2023 10:04:58   3.9N  126.4E mb=4.9  EMSC   KEPULAUAN TALAUD, INDONESIA  

P: 17SEP2023 156372     5.0N  128.0E 4.0-5.4 ABBAA  Halmahera                  

 

O: 16SEP2023 08:39:30   6.0S  151.3E mb=4.9  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 12SEP2023 156387     5.0S  152.0E 4.0-5.5 BAAAA  New Britain                

 

O: 16SEP2023 21:14:01   7.6S  127.6E mb=4.2  EMSC   KEPULAUAN BARAT DAYA, INDONESI

P: 14SEP2023 156379     7.0S  127.0E 4.0-5.4 AAAAA  Banda Sea                  

 

O: 16SEP2023 15:04:56   8.4N  125.9E ML=4.1  EMSC   MINDANAO, PHILIPPINES        

P: 18SEP2023 156372     8.0N  127.0E 4.0-5.5 AAAAA  Halmahera                  

P: 20SEP2023 156366     9.0N  126.0E 4.0-5.4 BAAAA  Central Philippines        

 

O: 17SEP2023 04:12:31  11.4N  125.4E ML=4.0  EMSC   SAMAR, PHILIPPINES           

P: 16SEP2023 156409    13.0N  124.0E 3.5-4.9 ABBAA  Luzon, Philippines         

 

O: 17SEP2023 02:58:12  19.2N  121.2E mb=4.5  EMSC   BABUYAN ISL REGION, PHILIPPINE

P: 12SEP2023 156435    20.0N  121.0E 4.0-5.4 BAAAA  Taiwan                     

 

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

 

CENTRAL AND SOUTH AMERICA

 

O: 16SEP2023 13:29:31   6.8N   73.1W mb=4.9  EMSC   NORTHERN COLOMBIA            

P: 18SEP2023 156367     7.0N   73.0W 4.0-5.4 AAAAA  Colombia                    

 

NEIC reported this earthquake of M 4.9 in northern Colombia was felt with intensity II-III in the area(s) of northern Colombia in Bucaramanga, Santander.

 

O: 16SEP2023 09:57:40  14.9N   94.5W ML=4.4  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 17SEP2023 156401    14.0N   94.0W 3.5-5.6 AAAAA  Chiapas, Mexico            

 

O: 16SEP2023 23:09:06  17.0N   95.0W ML=4.1  EMSC   OAXACA, MEXICO               

P: 12SEP2023 156402    17.0N   95.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

 

O: 16SEP2023 10:12:41  19.1N   66.6W MD=3.2  EMSC   PUERTO RICO REGION

O: 16SEP2023 10:38:04  19.1N   66.5W MD=3.3  EMSC   PUERTO RICO REGION

O: 16SEP2023 09:53:40  17.9N   66.9W MD=3.0  EMSC   PUERTO RICO REGION

O: 16SEP2023 12:38:28  17.9N   66.9W MD=3.2  EMSC   PUERTO RICO REGION

O: 16SEP2023 15:11:14  17.9N   66.9W MD=3.3  EMSC   PUERTO RICO REGION

O: 16SEP2023 07:54:40  17.9N   66.9W MD=3.6  EMSC   PUERTO RICO REGION           

P: 17SEP2023 156419    18.0N   69.0W 3.4-5.1 AABAA  Puerto Rico                

 

O: 17SEP2023 05:10:41  18.0N  100.8W ML=4.2  EMSC   GUERRERO, MEXICO             

P: 17SEP2023 156412    18.0N  101.0W 3.5-5.1 AAAAA  Michoacan, Mexico          

 

O: 17SEP2023 06:54:38  19.0N   68.4W MD=3.6  EMSC   DOMINICAN REPUBLIC REGION

O: 17SEP2023 01:51:45  18.2N   68.4W MD=3.5  EMSC   MONA PASSAGE, DOMINICAN REPUBL

P: 17SEP2023 156419    18.0N   69.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 16SEP2023 19:08:56  24.3S   67.2W ML=4.0  EMSC   SALTA, ARGENTINA             

P: 18SEP2023 156591    23.0S   67.0W 4.0-5.8 ABAAA  Argentina                  

 

O: 16SEP2023 17:29:22  27.7N  111.7W ML=3.7  EMSC   GULF OF CALIFORNIA           

P: 20SEP2023 156426    28.0N  112.0W 3.5-5.1 BAAAA  Gulf of California         

 

O: 17SEP2023 04:01:46  29.4S   71.3W Mw=5.0  EMSC   OFFSHORE COQUIMBO, CHILE     

O: 17SEP2023 04:01:46  29.5S   71.3W Mw=5.0  GUC    OFFSHORE COQUIMBO, CHILE     

P: 15SEP2023 156594    29.0S   70.0W 4.0-5.7 AAAAA  Coast Central Chile        

 

NEIC reported this earthquake of M 5.0 in Coquimbo, Chile was felt with intensity II-III in the area(s) of Coquimbo, Chile in La Serena (IV), Vicuna and Vallenar, Atacama.

GUC reported it was felt with intensity  V in  Coquimbo at La Serena, La Higuera; IV in Punta de Choros, Andacollo, Paihuano, Vicuna, Ovalle, Coquimbo, Rio Hurtado; II in Tongoy, Canela, Monte Patria and in Atacama with IV in Copiapo, Tierra Amarilla, Alto del Carmen, Freirina, Huasco and Vallenar, Chile.

 

O: 17SEP2023 02:18:06  37.8S   75.1W mb=5.0  EMSC   OFF COAST OF BIO-BIO, CHILE  

P: 14SEP2023 156608    37.0S   74.0W 4.0-5.6 BAAAA  Central Chile              

 

AFRICA AND EUROPE

 

O: 16SEP2023 23:22:34  31.1N    8.5W ML=3.8  EMSC   MOROCCO                      

P: 15SEP2023 156458    31.0N    8.0W 3.5-5.3 AAAAA  Morocco/Spain               

 

O: 16SEP2023 22:51:29  40.9N   52.0E mb=4.6  EMSC   CASPIAN SEA, OFFSHR TURKMENIST

P: 19SEP2023 156511    40.0N   52.0E 4.0-5.4 BAAAA  Kazakhstan                 

 

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

 

SOUTHWEST PACIFIC

 

O: 16SEP2023 20:53:10  13.5S  167.1E mb=4.7  EMSC   VANUATU                      

P: 11SEP2023 156589    12.0S  166.0E 4.0-5.4 BBAAA  Vanuatu Islands            

 

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

 

OCEAN RIDGES

 

O: 16SEP2023 13:47:57  13.7S   66.3E Mw=5.4  EMSC   MID-INDIAN RIDGE             

P: 10SEP2023 156319    15.0S   67.0E 4.0-5.6 CBAAA  So. Indian Ocean           

 

O: 16SEP2023 19:14:14  41.2S   89.4W mb=4.8  EMSC   SOUTHEAST OF EASTER ISLAND   

P: 13SEP2023 156616    43.0S   83.0W 4.0-5.8 BBCAA  Chile Rise                 

 

O: 16SEP2023 17:31:10  57.9S   25.0W mb=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 14SEP2023 156623    58.0S   25.0W 4.0-5.8 AAAAA  So. Sandwich Islands       

 

 

ZEALANDIA AND AUSTRALIA REGION

 

No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia

today. GeoNet did not report any felt events in the area.

 

JAPAN AND KURIL ISLANDS

 

O: 16SEP2023 18:28:21  44.9N  149.8E mb=4.5  EMSC   KURIL ISLANDS                

P: 14SEP2023 156535    45.0N  149.0E 3.5-5.5 AAAAA  So. Kurils                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 16SEP2023 09:40:45  30.9N  114.2W ML=3.8  EMSC   GULF OF CALIFORNIA            

P: 14SEP2023 156426    30.0N  114.0W 3.5-5.1 AAAAA  Gulf of California         

 

O: 16SEP2023 14:36:28  33.4N  116.7W ML=2.0  EMSC   SOUTHERN CALIFORNIA

O: 16SEP2023 16:49:57  34.0N  116.7W ML=2.6  EMSC   SOUTHERN CALIFORNIA

O: 16SEP2023 16:49:57  34.0N  116.7W ML=2.8  ANSS   SOUTHERN CALIFORNIA

O: 16SEP2023 14:28:00  32.9N  116.2W ML=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 16SEP2023 156478    32.9N  115.6W 2.5-4.8 AAAAA  So. California             

 

NEIC reported this earthquake of M 2.8 in Southern California was felt with intensity II-III in the area(s) of Southern California in White Water.

 

O: 16SEP2023 21:48:50  34.0N  118.3W ML=2.5  EMSC   GREATER LOS ANGELES AREA, CALI

P: 14SEP2023 156482    34.3N  118.5W 2.5-4.6 AAAAA  So. California              

 

NEIC reported this earthquake of M 2.5 in Los Angeles, California was felt with intensity II-III in the area(s) of Los Angeles, California in Los Angeles, Inglewood, Culver City, among others.

 

O: 16SEP2023 12:14:33  35.8N  120.4W MD=2.4  EMSC   CENTRAL CALIFORNIA           

P: 12SEP2023 156444    36.1N  120.1W 2.5-4.5 BAAAA  Central California         

 

O: 16SEP2023 07:40:08  37.4N  118.5W MD=2.1  EMSC   CENTRAL CALIFORNIA           

P: 13SEP2023 156440    37.4N  118.6W 2.5-4.6 BAAAA  California/Nevada area     

 

O: 16SEP2023 21:46:16  38.5N  119.5W MD=2.0  EMSC   CENTRAL CALIFORNIA           

P: 12SEP2023 156443    39.1N  119.6W 2.5-4.4 BAAAA  California/Nevada area     

 

O: 16SEP2023 20:36:19  39.4N  121.7W MD=2.9  EMSC   NORTHERN CALIFORNIA          

O: 16SEP2023 16:59:18  39.4N  122.4W MD=2.8  EMSC   NORTHERN CALIFORNIA          

P: 16SEP2023 156445    39.7N  123.7W 2.5-4.6 AAAAA  Central California         

 

O: 16SEP2023 13:11:14  40.7N  124.6W MD=2.3  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 13SEP2023 156526    40.5N  124.8W 2.5-4.6 BAAAA  Off Coast of No. Calif     

 

 

ALASKA

 

O: 16SEP2023 23:59:20  52.4N  169.4W ML=3.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 17SEP2023 156550    51.9N  169.2W 3.5-4.9 AAAAA  Fox Islands, Aleutians     

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

No events of M>=2 were located in the northwestern U.S. or western Canada today.

 

ROCKY MOUNTAINS REGION

 

No earthquakes of M>=2 were located in the Rocky Mountain region today.

 

EASTERN U.S./CANADA

 

No earthquakes of M>=1 were located in the Eastern U.S. or Canada today.

 

HAWAII

 

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

 

 

STRONG QUAKE SHAKES ATACAMA, CHILE

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 15, 2023

 

The strongest earthquake in the world today was an M 5.7-5.9 in the area off the coast of Atacama, Chile.  GUC reported this earthquake was felt with intensity III in  Atacama at Copiapo, Tierra Amarilla and Caldera, Chile. This earthquake occurred with the new moon within about an hour of local solar noon and was probably promoted by tidal stresses associated with that alignment as described in previous issues of this summary:

 

"The New Moon will arrive at 01:40 UT on September 15. Longitudes which will be at local solar midnight at this time are near 25 West while those at local solar noon are near 155 East. These include the same areas identified as probable area of tidal triggering with the Full Moon of August 31. This forecast identified these at the time as: "These zones include the central Atlantic and Iceland and western Europe in the west and the Kuril Islands, Japan and portions of eastern Indonesia and the Vanuatu Islands in the east. These areas are the most likely to see tidal triggering in the next week. Such events often occur near local solar midnight and noon. A major earthquake is considered likely with this full moon in the next week." (September 13-16, 2023)

 

A similar M 5.9 hit Atacama with the full moon on April 4, 2023. At the time this summary noted:

 

 

"An M 5.9 also shook the region of Central Chile in Atacama today. NEIC reported it was felt with intensity VI in Copiapo with IV in Diego de Almagro and in La Serena, Coquimbo, Chile. This is the largest earthquake in the Atacama region of Chile since an M 6.0 on July 4, 2021. That earthquake was associated with an X1.2 solar flare and a strong activation of western North America. At the time this summary noted:

 

 

"A series of moderately large to large earthquake hit along the western coastline of North and South America today. These included an M 5.6-5.7 in Nayarit, Gulf of California; two events of M 5.8-6.0 in Atacama, Chile and a series of light, but widely felt quakes in southern and central California of M 3.4-3.6.  Much of this activity may be related to an X1.5 solar flare which occurred  when the region of Atacama was sub-solar at 14:30 UT (#6940). This is the strongest solar flare reported since X9 and X8 flares on September 6 and 10, 2017, nearly four years ago. ...

 

 

Two strong earthquakes of M 5.9-6.0 struck the Atacama area of Central Chile today. They were felt with maximum intensity IX (local damage) at Vallenar; V in Vicuna and Ovalle, Coquimbo and IV in Coquimbo at Coquimbo, Copiapo, and IV in Valparaiso at Vina del Mar and Quilpue, Chile. ... The last earthquake of M>=6 within about 200 km of today's activity was a series on September 1, 2020 including events of M 6.8, 6.5 and 6.3 and prior to that an M 6.9 on November 11, 2015." (July 4, 2021, April 4, 2023)

 

O: 15SEP2023 18:07:42  27.3S   71.4W Mw=5.7  EMSC   OFFSHORE ATACAMA, CHILE      

O: 15SEP2023 18:07:42  27.3S   71.7W Mw=5.9  GUC    OFFSHORE ATACAMA, CHILE      

P: 13SEP2023 156593    26.0S   71.0W 4.0-5.6 ABAAA  Coast Central Chile        

P: 13SEP2023 156593    28.0S   67.0W 4.0-5.6 AACAA  Argentina                  

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 6.9 in the area of Morocco September 8, 2023, where promoted seismicity is considered likely.

 

Today's projected seismicity map follows for the coming week.

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 15SEP2023 10:34:23  24.0N  121.8E mb=4.9  EMSC   TAIWAN                       

O: 15SEP2023 10:34:31  24.4N  121.8E mb=5.0  EMSC   TAIWAN                       

P: 14SEP2023 156436    24.0N  122.0E 4.0-5.4 AAAAA  Taiwan                     

 

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

NEIC reported this earthquake of M 4.9 in Taiwan was felt with intensity II-III in the area(s) of Taiwan in Taipei and Ilan Counties.

 

O: 15SEP2023 17:15:06  37.1N   71.7E mb=4.3  EMSC   TAJIKISTAN                   

P: 15SEP2023 156451    36.0N   70.0E 3.8-5.4 ABBAA  Hindu Kush/Pakistan        

P: 16SEP2023 156451    37.0N   69.0E 3.8-5.2 AABAA  Hindu Kush/Pakistan        

 

O: 15SEP2023 15:54:21  56.0N  163.7E mb=4.2  EMSC   OFF EAST COAST OF KAMCHATKA  

P: 13SEP2023 156552    55.0N  164.0E 4.0-5.9 AAAAA  Komandorsky Isl            

 

INDONESIA AND PHILIPPINES

 

O: 15SEP2023 18:16:01   1.2N  126.4E mb=5.0  EMSC   MOLUCCA SEA                  

P: 17SEP2023 156374     1.0N  126.0E 4.0-5.6 AAAAA  Mindanao, Philippines      

 

O: 15SEP2023 12:43:58   2.8N  127.2E ML=4.0  EMSC   MOLUCCA SEA                  

P: 15SEP2023 156371     3.0N  128.0E 4.0-5.4 AAAAA  Halmahera                  

 

O: 15SEP2023 19:51:29   5.5S  128.9E mb=4.4  EMSC   BANDA SEA                    

P: 14SEP2023 156379     7.0S  127.0E 4.0-5.4 ABBAA  Banda Sea                  

 

O: 16SEP2023 01:29:19   5.8S  102.9E mb=4.8  EMSC   SOUTHERN SUMATRA, INDONESIA  

P: 12SEP2023 156398     6.0S  102.0E 4.0-5.5 BAAAA  So. of Sumatera            

 

O: 15SEP2023 19:50:58   9.5S  118.1E ML=4.3  EMSC   SUMBAWA REGION, INDONESIA    

P: 18SEP2023 156399     8.0S  119.0E 4.0-5.5 BBAAA  Sumbawa Island area        

 

CENTRAL AND SOUTH AMERICA

 

O: 15SEP2023 07:13:52   2.9S   77.5W ML=4.3  EMSC   PERU-ECUADOR BORDER REGION   

P: 18SEP2023 156383     1.0S   78.0W 4.0-5.5 BBAAA  Ecuador                    

 

O: 16SEP2023 06:59:04  18.6N   73.6W ML=3.3  EMSC   HAITI REGION                 

P: 15SEP2023 156422    19.0N   73.0W 3.0-4.6 AAAAA  Bahamas/No. Caribbean      

 

O: 15SEP2023 09:18:32  17.9N   67.0W MD=3.4  EMSC   PUERTO RICO REGION

O: 15SEP2023 15:33:36  17.9N   67.1W MD=3.2  EMSC   PUERTO RICO REGION

O: 15SEP2023 10:20:17  19.0N   66.0W MD=3.0  EMSC   PUERTO RICO REGION           

P: 13SEP2023 156408    18.0N   65.0W 3.0-4.9 AAAAA  Leeward Islands            

 

O: 15SEP2023 16:44:52  19.6N   64.7W MD=3.8  EMSC   VIRGIN ISLANDS REGION

O: 15SEP2023 08:56:07  19.7N   64.7W MD=3.9  EMSC   VIRGIN ISLANDS REGION

O: 15SEP2023 18:00:46  19.5N   64.7W MD=3.9  EMSC   VIRGIN ISLANDS REGION        

P: 17SEP2023 156408    19.0N   65.0W 3.0-4.9 AAAAA  Leeward Islands            

 

O: 15SEP2023 19:30:39  21.3N  106.2W ML=4.1  EMSC   ISLAS MARIAS REG., NAYARIT, ME

P: 11SEP2023 156404    19.0N  106.0W 3.5-5.1 BCAAA  Coast of Jalisco, Mexico   

 

O: 15SEP2023 22:31:29  21.4S   67.8W ML=4.0  EMSC   POTOSI, BOLIVIA              

P: 12SEP2023 156591    22.0S   68.0W 4.0-6.1 BAAAA  Argentina                  

 

O: 15SEP2023 21:40:30  23.5S   66.8W ML=3.0  EMSC   JUJUY, ARGENTINA             

P: 18SEP2023 156591    23.0S   67.0W 4.0-5.8 BAAAA  Argentina                  

 

O: 15SEP2023 18:07:42  27.3S   71.4W Mw=5.7  EMSC   OFFSHORE ATACAMA, CHILE      

O: 15SEP2023 18:07:42  27.3S   71.7W Mw=5.9  GUC    OFFSHORE ATACAMA, CHILE      

P: 13SEP2023 156593    26.0S   71.0W 4.0-5.6 ABAAA  Coast Central Chile        

P: 13SEP2023 156593    28.0S   67.0W 4.0-5.6 AACAA  Argentina                  

 

GUC reported this earthquake was felt with intensity  III in  Atacama at Copiapo, Tierra Amarilla and Caldera, Chile.

 

 

O: 15SEP2023 16:59:50  14.7N   94.6W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 16SEP2023 02:52:41  14.7N   94.6W ML=4.4  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 16SEP2023 02:45:26  14.8N   94.1W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 16SEP2023 03:01:16  14.8N   94.6W ML=4.2  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 16SEP2023 06:44:09  14.8N   94.6W ML=4.2  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 15SEP2023 17:22:52  15.0N   94.5W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 15SEP2023 22:37:48  15.0N   93.5W ML=4.3  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 16SEP2023 04:51:04  15.1N   94.3W ML=4.4  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 15SEP2023 08:50:35  15.9N   94.9W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 15SEP2023 13:03:54  16.6N   94.6W ML=4.0  EMSC   OAXACA, MEXICO

O: 15SEP2023 21:44:05  16.7N   94.5W ML=4.2  EMSC   OAXACA, MEXICO               

P: 14SEP2023 156402    16.0N   94.0W 3.5-5.5 AAAAA  Chiapas, Mexico             

 

AFRICA AND EUROPE

 

O: 15SEP2023 11:44:20  10.7N   49.4E mb=4.5  EMSC   NORTHEASTERN SOMALIA         

 

O: 15SEP2023 23:49:53  38.1N    8.7W ML=3.8  EMSC   PORTUGAL                     

 

O: 15SEP2023 22:57:14  37.0N   23.9E mb=4.1  EMSC   SOUTHERN GREECE              

P: 17SEP2023 156463    36.0N   22.0E 3.0-4.8 AABAA  No. Greece                 

 

O: 16SEP2023 06:16:01  45.6N   26.4E ML=3.9  EMSC   ROMANIA                      

P: 16SEP2023 156534    46.0N   27.0E 3.0-5.3 AAAAA  Romania/NW Turkey           

 

NEIC reported this earthquake of M 3.8 in Romania was felt with intensity II-III in the area(s) of Romania in Buzau.

 

O: 16SEP2023 01:48:35  41.2N   48.3E mb=3.9  EMSC   AZERBAIJAN                   

P: 19SEP2023 156511    40.0N   52.0E 4.0-5.4 BBCAA  Kazakhstan                 

 

O: 15SEP2023 10:04:52  51.4N   16.1E ML=3.1  EMSC   POLAND                       

P: 13SEP2023 156556    52.0N   16.0E 3.0-4.6 AAAAA  Poland                     

 

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

 

SOUTHWEST PACIFIC

 

O: 15SEP2023 17:04:30  15.6S  174.4W mb=4.9  EMSC   TONGA                        

P: 14SEP2023 156582    15.0S  176.0W 4.0-5.5 AABAA  Samoa Islands              

P: 18SEP2023 156582    15.0S  175.0W 4.0-5.5 BAAAA  Samoa Islands              

 

O: 15SEP2023 23:06:57  24.3S  175.6W mb=5.0  EMSC   SOUTH OF TONGA               

P: 15SEP2023 156601    25.0S  176.0W 4.0-5.5 AAAAA  Tonga Islands              

P: 19SEP2023 156601    24.0S  175.0W 4.0-5.7 BAAAA  Tonga Islands              

 

O: 15SEP2023 14:57:09  25.2S  179.4W mb=4.3  EMSC   SOUTH OF FIJI ISLANDS        

P: 13SEP2023 156603    25.0S  179.0W 4.0-5.4 AAAAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 15SEP2023 09:30:02  60.4S   25.8W mb=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 18SEP2023 156624    61.0S   26.0W 4.0-5.4 BAAAA  Southern  Ocean            

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 16SEP2023 02:01:49  30.7S  178.3W mb=5.0  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 15SEP2023 13:02:27  30.1S  177.7W mb=5.1  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 14SEP2023 156614    31.0S  177.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

P: 16SEP2023 156610    30.0S  179.0W 4.0-5.6 AAAAA  No. Kermadec Islands       

 

JAPAN AND KURIL ISLANDS

 

O: 15SEP2023 07:20:08  28.3N  140.3E mb=4.4  EMSC   BONIN ISLANDS, JAPAN REGION  

P: 14SEP2023 156423    28.0N  143.0E 4.0-5.5 AABAA  Bonin Islands              

 

O: 15SEP2023 19:35:55  37.1N  141.6E mb=4.6  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 15SEP2023 156471    38.0N  141.0E 4.0-5.9 AAAAA  Off East Coast Honshu      

 

O: 15SEP2023 07:46:03  50.7N  157.3E mb=4.1  EMSC   KURIL ISLANDS                

P: 15SEP2023 156551    51.0N  156.0E 4.0-5.7 AAAAA  Kamchatka                  

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 15SEP2023 10:40:44  31.3N  115.6W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO

 

O: 15SEP2023 16:42:57  30.5N  116.2W ML=3.1  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 13SEP2023 156477    30.8N  116.2W 2.5-4.8 AAAAA  So. California             

 

O: 15SEP2023 17:12:51  31.9N  116.2W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO      

P: 13SEP2023 156477    30.8N  116.2W 2.5-4.8 AAAAA  So. California             

P: 20SEP2023 156477    32.6N  116.1W 2.5-4.8 BAAAA  So. California             

 

O: 15SEP2023 10:58:47  34.4N  119.2W ML=2.0  EMSC   SOUTHERN CALIFORNIA

O: 15SEP2023 11:17:00  34.4N  119.2W ML=2.4  EMSC   SOUTHERN CALIFORNIA          

P: 16SEP2023 156484    34.9N  119.0W 2.5-4.6 AAAAA  So. California             

 

NEIC reported this earthquake of M 2.5 in Southern California was felt with intensity II-III in the area(s) of Southern California in Oak View, Santa Paula and Chatsworth.

 

O: 15SEP2023 13:43:47  38.2N  117.9W ML=2.5  EMSC   NEVADA                       

O: 15SEP2023 22:24:16  38.2N  118.2W ML=3.1  EMSC   NEVADA

P: 16SEP2023 156442    38.2N  118.2W 2.5-4.5 AAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 3.2 in Nevada was felt with intensity II-III in the area(s) of Nevada in Glenbrook.

 

O: 15SEP2023 19:13:09  38.3N  122.2W MD=2.2  EMSC   NORTHERN CALIFORNIA          

O: 15SEP2023 15:35:43  38.4N  122.6W MD=2.4  EMSC   NORTHERN CALIFORNIA

P: 13SEP2023 156444    38.0N  122.3W 2.5-4.4 AAAAA  Central California         

 

O: 15SEP2023 18:02:26  40.2N  121.2W ML=2.7  EMSC   NORTHERN CALIFORNIA

O: 16SEP2023 06:34:16  40.6N  122.7W MD=2.4  EMSC   NORTHERN CALIFORNIA

O: 15SEP2023 21:41:15  41.0N  121.5W MD=2.9  EMSC   NORTHERN CALIFORNIA

O: 15SEP2023 21:45:20  39.5N  122.6W ML=2.9  EMSC   NORTHERN CALIFORNIA           

P: 13SEP2023 156525    40.6N  122.4W 2.5-4.5 AAAAA  Northern California        

 

NEIC reported this earthquake of M 2.7 in Northern California was felt with intensity II-III in the area(s) of Northern California in Westwood, Susanville.

 

ALASKA

 

O: 15SEP2023 09:07:45  56.8N  154.0W ML=3.3  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 13SEP2023 156541    54.7N  156.9W 3.5-5.0 ACBAA  Alaska Peninsula           

 

O: 16SEP2023 04:13:48  69.1N  144.6W ML=3.2  EMSC   NORTHERN ALASKA              

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 15SEP2023 11:56:13  43.3N  127.9W ML=2.5  EMSC   OFF COAST OF OREGON          

P: 12SEP2023 156527    43.9N  128.4W 3.0-4.4 BAAAA  Off Coast of Oregon        

 

NEIC reported this earthquake of M 2.5 off the coast of Oregon  was felt with intensity II-III in the area(s) of Oregon in Salem.

 

O: 15SEP2023 15:26:35  50.6N  130.5W ML=2.9  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 13SEP2023 156546    50.5N  130.4W 3.0-4.9 AAAAA  British Colombia           

 

ROCKY MOUNTAINS REGION

 

O: 15SEP2023 12:02:46  32.0N  103.8W ML=2.2  EMSC   NEW MEXICO                   

P: 13SEP2023 156474    31.4N  103.8W 2.0-4.1 AAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 15SEP2023 07:42:25  29.1N   97.9W ML=2.2  EMSC   SOUTHERN TEXAS

O: 15SEP2023 11:58:32  29.0N   97.9W ML=3.0  EMSC   SOUTHERN TEXAS               

P: 13SEP2023 156430    28.0N   98.0W 3.0-4.6 AAAAA  Northern Mexico            

 

O: 16SEP2023 06:42:19  36.7N   89.5W MD=2.7  EMSC   SOUTHEASTERN MISSOURI        

P: 14SEP2023 156461    36.0N   89.0W 2.0-4.4 AAAAA  New Madrid area            

 

HAWAII

 

 

NEIC reported an earthquake of M 3.3 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Naalehu and Mountain View.

MODERATE QUAKES IN NEW BRITAIN, PNG; SOUTHEAST PACIFIC

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 14, 2023

 

The strongest earthquake in the world today was an M 5.6 in New Britain, New Guinea. NEIC reported it was felt with maximum intensity V in New Britain at Kimbe and II in Port Moresby,  PNG. A similar earthquake of M 5.6 occurred about 100 km west of this epicenter on  August 13, 2023, but the last earthquake of larger magnitude in New Britain was an M 6.3 on April 19, 2023 which, like today's event occurred with the new moon. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.3 in the area of New Guinea. This event was reported by NEIC to have been felt with intensity V in New Britain, Papua New Guinea in Kandrian and VI in Kimbe with intensity II-III in Kae, Morobe, Kainantu, Port Moresby and Mount Hagen, Papua New Guinea. This epicenter is located along the path of totality of the solar eclipse today (see discussion below and in "TIDAL" section of this summary. It is likely it was promoted by strong tidal stresses associated with this alignment. The last earthquake at shallow or intermediate focus with M>=6.3 within about 200 km of this epicenter was an M 6.3 on March 5, 2017. An M 6.5 hit at a depth of 600 km on March 1, 2023 outside this 200 km distance. An M 7.0 on October 10, 2018 was about 200 km from today's epicenter." (April 19, 2023)

 

Forecast 156389 had expected today's event within about 150 km was likely around September 14, 2023.

 

O: 14SEP2023 23:15:32   6.4S  149.5E mb=5.0  EMSC   NEW BRITAIN REGION, P.N.G.

O: 14SEP2023 19:58:45   6.2S  149.6E Mw=5.6  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 14SEP2023 156389     5.0S  150.0E 4.0-5.5 ABAAA  New Ireland                

 

A similar event of M 5.6 in the area southeast of Easter Island followed an M 4.9 earlier in the day. The foreshock occurred near local solar midnight and may have been promoted by the strong tidal stresses today with the new moon. This is probably a regional aftershock of an M 6.1 in the West Chile Rise about 200 km to the east of today's event on September 13. At that time this summary noted:

 

 

The strongest earthquake in the world today was an M 6.1 in the West Chile Rise.

It was not reported felt in this remote area. The only earthquake in the past 3 years of larger magnitude than M 6.1 in the West Chile Rise was an M 6.7 on February 3, 2021. At the time this summary noted in this regard:

 

"This earthquake is the strongest within about 400 km of this epicenter in at least the historical record for the area. Earthquakes in this area of M 6.5 hit on 1934, 1937, 1954, 1975, 1997 and 1999. It occurred within about an hour of local solar midnight, a time when geomagnetic effects are prominent and may have been related to those as well as to tidal stresses which maximize near this hour. Forecast 131093 had  expected today's event within about 50 km was likely around February 8 in the Chile Rise area. The antipode of this epicenter is in China north of Nepal at 36N 83E" (February 3, 2021)

 

Forecast 156347 had expected today's event within about 100 km was likely around September 9, 2023. This epicenter is at 107 degrees from the M 6.8 in Morocco of September 8 and may have been promoted by energy from that source." (September 13, 2023)

 

These events in the south Pacific are near 103 degrees from the M 6.8 in Morocco of September 8 and may have been promoted by energy from that source.

 

O: 14SEP2023 07:19:50  36.3S   99.6W mb=4.9  EMSC   SOUTHEAST OF EASTER ISLAND

O: 14SEP2023 22:51:27  36.5S   98.1W Mw=5.6  EMSC   SOUTHEAST OF EASTER ISLAND   

P:  9SEP2023 156347    36.0S   97.0W 4.0-5.9 BAAAA  Chile Rise                 

 

An unusually strong earthquake of M 4.0 shook the Falls City area of Southern Texas today. NEIC reported it was felt with maximum intensity IV in Hobson, Karnes City and Falls City with II-III shaking in Gillett, Stockdale, Poth, Sutherland Springs, Floresville and Kenedy among others. This event may have been triggered by Solar Flare effects from flare #9230 (SWPC - which maximized within minutes of this earthquake with parameters from SWPC as:

 

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

-------------------------------------------------------------------------

 

9230       1840   1845      1850   C2.9      (September 14, 2023)   1.6E-03  

 

The earthquake in Texas occurred within minutes of local solar noon and SFE re most prominent at this hour - reinforcing the suspicion this could have been promoted by flare 9230. Today's event in Texas follows a series of smaller events which began about two years ago with an M 3.5 on October 30, 2022 but is the strongest event in this series to date - the strongest prior to today in this series was an M 3.8 on July 19, 2023. Stronger regional events have been recorded as an M 4.8 on October 20, 2011 and an M 4.3 on April 9, 1993.  At the time of the October 30, 2022 this summary noted:

 

"An earthquake of M 3.5 also shook Southern Texas today. NEIC reported intensity II-III in Texas at Westhoff, Smiley and Cotulla. This is the strongest earthquake within about 100 km of this epicenter since an M 3.5-3.6 on June 16, 2019 but the last event of significantly larger magnitude in this area was an M 4.8 on October 20, 2011." (October 30, 2022)

 

Forecast 156430 had expected today's event within this area was likely around

September 13, 2023.

 

O: 14SEP2023 18:50:41  29.1N   97.9W mb=4.0  EMSC   SOUTHERN TEXAS               

P: 13SEP2023 156430    28.0N   98.0W 3.0-4.6 ABAAA  Northern Mexico            

 

An M 4.6 aftershock in Morocco today was widely felt in the area. Like the event in Texas this event may have been triggered by SFE from flare #9160 with parameters from SWPC as:

 

 

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

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9160       0548   0600      0611   C1.5      (September 14, 2023)   6.8E-04  

 

NEIC reported this M 4.6 was felt with intensity IV in Morocco at Oulad Teima, Essaouira, Marrakech and III in Taroudannt, Agadir, Ouarzazate, Ben Guerir, Safi, Tiznit, and El Jadida. A major incidence of earthquake lights has been reported to have occurred in Morocco shortly before the M 6.8 there on September 8. This has been published in reliable sources. Earthquake lights are often observed in association with major earthquake and have been seen and reported for thousands of years. Many theories try to explain them but the exact cause of these phenomena is still unknown. Thanks to Pam, a reader of this summary for a good summary she sent in this regard. Similar summaries are available on the web for readers to peruse. The death toll from this earthquake is near 3000 with more than  5600 injured. Forecast 156458 had expected enhanced seismicity in  this region of Morocco was likely around September 11.

 

O: 14SEP2023 05:53:16  31.0N    8.4W mb=4.6  EMSC   MOROCCO                      

O: 13SEP2023 15:45:07  31.3N    8.2W ML=3.5  EMSC   MOROCCO                      

O: 15SEP2023 04:55:40  31.6N    7.6W mb=3.7  EMSC   MOROCCO                      

P: 11SEP2023 156458    30.0N    8.0W 3.5-5.3 AAAAA  Morocco/Spain              

 

The largest earthquake in the U.S. or Canada today was an M 4.4 in Southern Alaska. This is the strongest earthquake within about 150 km of this epicenter in Southern Alaska since an M 4.4 on August 6, 2023 and an M 5.0 on July 28, 2023.  This earthquake occurred within minutes of local solar noon and was probably promoted by tidal stresses with today's new moon. Forecast 156568 had expected today's event in this area was likely around September 14.

 

O: 14SEP2023 22:35:04  59.3N  153.5W mb=4.4  EMSC   SOUTHERN ALASKA              

P: 14SEP2023 156568    60.0N  153.5W 3.2-5.1 AAAAA  Central Alaska             

 

A series of light to moderate earthquake with maximum events of M 4.2 occurred today in the region near Vancouver, British Columbia, Canada. These events centered near local solar noon and were probably promoted by the new moon tidal stresses today which maximized near this time as noted in this and previous issues of this summary:

 

"The New Moon will arrive at 01:40 UT on September 15. Longitudes which will be at local solar midnight at this time are near 25 West while those at local solar noon are near 155 East. These include the same areas identified as probable area of tidal triggering with the Full Moon of August 31. This forecast identified these at the time as: "These zones include the central Atlantic and Iceland and western Europe in the west and the Kuril Islands, Japan and portions of eastern Indonesia and the Vanuatu Islands in the east. These areas are the most likely to see tidal triggering in the next week. Such events often occur near local solar midnight and noon. A major earthquake is considered likely with this full moon in the next week." (September 13-15, 2023)

 

Following is an abridged listing of earthquake in this swarm with M>=3.7. A more complete listing can be found under "PACIFIC CANADA" section of this report.

 

O: 14SEP2023 17:12:22  50.6N  130.5W ML=3.7  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:27:10  50.6N  130.5W ML=3.9  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:41:29  50.6N  130.5W ML=4.2  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:03:37  50.7N  130.4W ML=3.7  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:15:42  50.7N  130.5W ML=4.0  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:31:06  50.7N  130.4W ML=4.2  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:52:26  50.7N  130.5W ML=4.1  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 18:02:47  50.7N  130.5W ML=4.0  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 18:02:47  50.7N  130.5W MB=4.0  ECAN of Port Hardy, BC  

O: 14SEP2023 17:52:26  50.7N  130.5W MB=4.1  ECAN of Port Hardy, BC  

O: 14SEP2023 17:41:29  50.6N  130.5W MB=4.3  ECAN of Port Hardy, BC  

O: 14SEP2023 17:31:06  50.7N  130.4W MB=4.2  ECAN of Port Hardy, BC  

O: 14SEP2023 17:27:10  50.6N  130.5W MB=3.9  ECAN of Port Hardy, BC  

O: 14SEP2023 17:15:42  50.7N  130.5W MB=4.0  ECAN of Port Hardy, BC  

O: 14SEP2023 17:12:22  50.6N  130.5W MB=3.7  ECAN of Port Hardy, BC  

O: 14SEP2023 17:03:37  50.7N  130.4W MB=3.7  ECAN of Port Hardy, BC  

P: 13SEP2023 156546    50.5N  130.4W 3.0-4.9 AAAAA  British Colombia           

 

 

Today's activity in Vancouver is the strongest in the region since M 4.6  and M 6.0 on April 19 and 13, 2023. 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 6.9 in the area of Morocco September 8, 2023, where promoted seismicity is considered likely.

 

Today's projected seismicity map follows for the coming week.

 

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

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

 

INDONESIA AND PHILIPPINES

 

O: 14SEP2023 23:15:32   6.4S  149.5E mb=5.0  EMSC   NEW BRITAIN REGION, P.N.G.

O: 14SEP2023 19:58:45   6.2S  149.6E Mw=5.6  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 14SEP2023 156389     5.0S  150.0E 4.0-5.5 ABAAA  New Ireland                

 

O: 14SEP2023 13:46:04   7.9N  124.9E mb=4.6  EMSC   MINDANAO, PHILIPPINES        

P: 11SEP2023 156366     7.0N  124.0E 4.0-5.4 BAAAA  Central Philippines        

P: 16SEP2023 156366     7.0N  126.0E 4.0-5.4 AAAAA  Central Philippines        

 

O: 15SEP2023 04:26:48  15.5N  145.8E mb=4.7  EMSC   SAIPAN REG., N. MARIANA ISLAND

P: 16SEP2023 156415    15.0N  147.0E 4.0-5.4 AAAAA  No. Marianas               

 

NEIC reported this earthquake of M 4.7 north of Guam  was felt with intensity II-III in the area(s) north of Guam in Tinian MP.

 

CENTRAL AND SOUTH AMERICA

 

O: 14SEP2023 14:25:07   5.3N   76.7W Mw=5.2  EMSC   COLOMBIA                     

P: 15SEP2023 156367     5.0N   76.0W 4.0-5.6 AAAAA  Colombia                   

 

NEIC reported this earthquake of M 5.2 in Colombia was felt with intensity II-III in the area(s) of Colombia with IV in Pereira, Risaralda and Chinchina, Caldas and III in Cartago, Santa Rosa de Cabal, Sabaneta, Carmen de Viboral, Guatape and Envigado, Antioquia among others.

 

O: 14SEP2023 07:01:04   6.8N   73.1W Mw=5.1  EMSC   NORTHERN COLOMBIA            

P: 18SEP2023 156367     7.0N   73.0W 4.0-5.4 BAAAA  Colombia                   

 

NEIC reported this earthquake of M 5.1 in Northern Colombia was felt with intensity II-III in the area(s) of Northern Colombia with IV in Sandander at Floridablanca, Duitama and II-III in Piedecuesta, Bucaramanga, Hato, Cajica and in San Cristobal, Venezuela.

 

O: 15SEP2023 03:41:13  15.0N   93.5W ML=4.2  EMSC   OFFSHORE CHIAPAS, MEXICO     

O: 15SEP2023 05:02:44  15.7N   93.8W ML=4.2  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 14SEP2023 14:55:25  15.9N   94.9W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

P: 12SEP2023 156401    16.0N   93.0W 3.5-5.5 BAAAA  Chiapas, Mexico            

P: 14SEP2023 156402    16.0N   94.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O: 14SEP2023 23:48:26  15.4N   96.8W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 12SEP2023 156417    15.0N   97.0W 3.5-5.4 AAAAA  Oaxaca, Mexico             

 

O: 14SEP2023 15:03:00  15.6N   97.3W ML=4.2  EMSC   OFFSHORE OAXACA, MEXICO      

P: 12SEP2023 156417    15.0N   97.0W 3.5-5.4 AAAAA  Oaxaca, Mexico             

 

O: 15SEP2023 04:21:05  17.4S   70.8W ML=4.0  EMSC   SOUTHERN PERU                

P: 14SEP2023 156584    18.0S   70.0W 4.0-5.9 AAAAA  So. Peru/Bolivia           

 

O: 15SEP2023 06:23:03  17.6N   81.6W mb=4.4  EMSC   CAYMAN ISLANDS REGION        

 

O: 14SEP2023 20:18:25  17.9N   66.7W MD=3.0  EMSC   PUERTO RICO REGION           

P: 13SEP2023 156408    18.0N   65.0W 3.0-4.9 AAAAA  Leeward Islands            

 

O: 14SEP2023 10:44:53  18.2N   99.1W mb=4.0  EMSC   GUERRERO, MEXICO             

P: 13SEP2023 156418    18.0N   99.0W 3.5-5.3 AAAAA  Oaxaca, Mexico             

 

NEIC reported this earthquake of M 4.0 in Guerrero, Mexico was felt with intensity II-III in the area(s) of Guerrero, Mexico in Chilpancingo and in Mexico City and Tlanepantla.

 

O: 14SEP2023 09:58:47  19.7N   65.3W MD=3.8  EMSC   PUERTO RICO REGION           

P: 17SEP2023 156408    19.0N   65.0W 3.0-4.9 BAAAA  Leeward Islands            

 

O: 14SEP2023 10:38:15  21.9S   68.5W ML=4.0  EMSC   ANTOFAGASTA, CHILE

O: 15SEP2023 03:09:23  20.8S   69.1W mb=4.5  EMSC   TARAPACA, CHILE              

P: 17SEP2023 156600    20.0S   68.0W 4.0-5.6 AAAAA  So. Peru/Bolivia           

 

NEIC reported this earthquake of M 4.5 in Tarapaca, Chile was felt with intensity II-III in the area(s) of Tarapaca, Chile in Iquique.

 

O: 14SEP2023 21:43:42  25.6N  109.8W ML=4.2  EMSC   GULF OF CALIFORNIA           

P: 16SEP2023 156425    24.0N  109.0W 3.5-5.2 ABAAA  Gulf of California         

 

O: 14SEP2023 14:40:17  27.3S   71.3W ML=4.0  EMSC   OFFSHORE ATACAMA, CHILE      

P: 13SEP2023 156593    26.0S   71.0W 4.0-5.6 ABAAA  Coast Central Chile        

P: 15SEP2023 156594    29.0S   70.0W 4.0-5.7 ABAAA  Coast Central Chile        

 

O: 14SEP2023 07:32:51  28.0N  112.1W ML=4.2  EMSC   GULF OF CALIFORNIA           

P: 20SEP2023 156426    28.0N  112.0W 3.5-5.1 CAAAA  Gulf of California         

 

AFRICA AND EUROPE

 

O: 15SEP2023 04:55:40  31.6N    7.6W mb=3.7  EMSC   MOROCCO                      

P: 15SEP2023 156458    31.0N    8.0W 3.5-5.3 AAAAA  Morocco/Spain              

 

O: 15SEP2023 06:16:11  71.2N    8.0W ML=2.5  EMSC   JAN MAYEN ISLAND REGION      

P: 14SEP2023 156578    71.0N    7.0W 3.5-5.2 AAAAA  Jan Mayen Isl. area        

 

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

 

SOUTHWEST PACIFIC

 

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

 

OCEAN RIDGES

 

O: 14SEP2023 07:19:50  36.3S   99.6W mb=4.9  EMSC   SOUTHEAST OF EASTER ISLAND

O: 14SEP2023 22:51:27  36.5S   98.1W Mw=5.6  EMSC   SOUTHEAST OF EASTER ISLAND   

P:  9SEP2023 156347    36.0S   97.0W 4.0-5.9 BAAAA  Chile Rise                 

 

O: 14SEP2023 23:51:27  58.0S   25.3W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 14SEP2023 156623    58.0S   25.0W 4.0-5.8 AAAAA  So. Sandwich Islands       

 

O: 15SEP2023 02:37:46  60.8S   23.7W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 12SEP2023 156624    61.0S   22.0W 4.0-5.5 BAAAA  Southern  Ocean            

 

 

ZEALANDIA AND AUSTRALIA REGION

 

No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia

today. GeoNet did not report any felt events in the area.

 

JAPAN AND KURIL ISLANDS

 

O: 14SEP2023 11:51:16  23.2N  124.4E mb=4.5  EMSC   SOUTHWESTERN RYUKYU ISL., JAPA

P: 13SEP2023 156431    25.0N  123.0E 4.0-5.4 ABAAA  Ryukyu Islands             

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 14SEP2023 08:54:47  30.3N  116.1W ML=3.4  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O: 14SEP2023 07:56:35  30.6N  114.5W ML=3.3  EMSC   GULF OF CALIFORNIA           

P: 14SEP2023 156426    30.0N  114.0W 3.5-5.1 AAAAA  Gulf of California         

 

O: 14SEP2023 09:14:28  31.0N  115.8W ML=3.0  EMSC   BAJA CALIFORNIA, MEXICO

O: 14SEP2023 08:26:17  31.5N  115.6W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO

O: 14SEP2023 21:11:51  31.8N  115.8W ML=3.6  EMSC   BAJA CALIFORNIA, MEXICO

O: 14SEP2023 21:32:26  31.8N  115.9W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO      

P: 13SEP2023 156477    30.8N  116.2W 2.5-4.8 AAAAA  So. California             

 

O: 14SEP2023 18:00:54  33.5N  118.8W ML=2.1  EMSC   CHANNEL ISLANDS REG., CALIFORN

P: 14SEP2023 156482    34.3N  118.5W 2.5-4.6 AAAAA  So. California             

 

O: 14SEP2023 09:46:43  35.4N  117.2W ML=2.6  EMSC   SOUTHERN CALIFORNIA          

P: 13SEP2023 156485    35.1N  117.0W 2.5-4.8 AAAAA  So. California             

 

O: 14SEP2023 23:48:21  38.2N  117.9W ML=2.3  EMSC   NEVADA                       

P: 16SEP2023 156442    38.2N  118.2W 2.5-4.5 AAAAA  California/Nevada area     

 

O: 14SEP2023 10:42:21  39.2N  120.5W MD=1.8  EMSC   NORTHERN CALIFORNIA          

P: 12SEP2023 156443    39.3N  119.6W 2.5-4.4 AAAAA  California/Nevada area     

P: 20SEP2023 156446    39.4N  120.5W 2.5-4.4 CAAAA  Central California         

 

 

ALASKA

 

O: 14SEP2023 22:55:37  51.3N  179.5W ML=3.5  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 15SEP2023 156544    50.9N  179.0W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

O: 14SEP2023 22:35:04  59.3N  153.5W mb=4.4  EMSC   SOUTHERN ALASKA              

P: 14SEP2023 156568    60.0N  153.5W 3.2-5.1 AAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 13SEP2023 06:46:44  61.4N  140.0W MB=4.1  ECAN of Burwash Landing, YT         

P: 18SEP2023 156566    60.0N  138.0W 3.2-5.3 BBAAA  Central Alaska             

 

O: 14SEP2023 17:12:22  50.6N  130.5W ML=3.7  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:27:10  50.6N  130.5W ML=3.9  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:41:29  50.6N  130.5W ML=4.2  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 18:06:26  50.6N  130.5W ML=3.1  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:00:17  50.7N  130.5W ML=3.3  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:03:37  50.7N  130.4W ML=3.7  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:15:42  50.7N  130.5W ML=4.0  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:31:06  50.7N  130.4W ML=4.2  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:48:11  50.7N  130.4W ML=3.1  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:52:26  50.7N  130.5W ML=4.1  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 17:55:20  50.7N  130.4W ML=3.5  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 18:02:47  50.7N  130.5W ML=4.0  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 18:10:22  50.7N  130.4W ML=2.8  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 18:13:45  50.7N  130.4W ML=3.2  EMSC   VANCOUVER ISLAND, CANADA REGION

O: 14SEP2023 18:34:55  50.7N  130.4W MB=3.2  ECAN of Port Hardy, BC  

O: 14SEP2023 18:13:45  50.7N  130.4W MB=3.2  ECAN of Port Hardy, BC  

O: 14SEP2023 18:06:26  50.6N  130.5W MB=3.1  ECAN of Port Hardy, BC  

O: 14SEP2023 18:02:47  50.7N  130.5W MB=4.0  ECAN of Port Hardy, BC  

O: 14SEP2023 17:55:20  50.7N  130.4W MB=3.5  ECAN of Port Hardy, BC  

O: 14SEP2023 17:52:26  50.7N  130.5W MB=4.1  ECAN of Port Hardy, BC  

O: 14SEP2023 17:48:11  50.7N  130.4W MB=3.1  ECAN of Port Hardy, BC  

O: 14SEP2023 17:41:29  50.6N  130.5W MB=4.3  ECAN of Port Hardy, BC  

O: 14SEP2023 17:31:06  50.7N  130.4W MB=4.2  ECAN of Port Hardy, BC  

O: 14SEP2023 17:27:10  50.6N  130.5W MB=3.9  ECAN of Port Hardy, BC  

O: 14SEP2023 17:15:42  50.7N  130.5W MB=4.0  ECAN of Port Hardy, BC  

O: 14SEP2023 17:12:22  50.6N  130.5W MB=3.7  ECAN of Port Hardy, BC  

O: 14SEP2023 17:03:37  50.7N  130.4W MB=3.7  ECAN of Port Hardy, BC  

O: 14SEP2023 17:00:17  50.7N  130.5W MB=3.3  ECAN of Port Hardy, BC  

O: 13SEP2023 10:01:55  50.7N  130.5W MB=3.0  ECAN of Port Hardy, BC  

O: 14SEP2023 18:34:55  50.7N  130.4W ML=3.2  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 13SEP2023 156546    50.5N  130.4W 3.0-4.9 AAAAA  British Colombia           

 

 

ROCKY MOUNTAINS REGION

 

O: 14SEP2023 07:02:57  31.8N  104.2W ML=2.1  EMSC   WESTERN TEXAS

O: 14SEP2023 12:11:55  31.7N  104.4W ML=2.1  EMSC   WESTERN TEXAS                

P: 16SEP2023 156474    31.4N  104.2W 2.0-4.1 AAAAA  SW U.S.A                   

 

O: 14SEP2023 15:25:53  40.8N  111.7W ML=2.5  EMSC   UTAH                         

P: 14SEP2023 156498    39.7N  111.9W 2.0-4.3 ABAAA  Utah area                   

 

NEIC reported this earthquake of M 2.5 in northern Utah was felt with intensity II-III in the area(s) of northern Utah in Salt Lake City, Park City and Draper.

 

O: 14SEP2023 15:09:34  44.3N  115.2W ML=2.2  EMSC   SOUTHERN IDAHO               

P: 13SEP2023 156515    44.4N  114.1W 2.0-4.1 AAAAA  Montana/Idaho              

P: 17SEP2023 156515    44.4N  115.1W 2.0-4.1 BAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 13SEP2023 19:55:22  47.7N   70.0W MB=1.9  ECAN of La Malbaie, QC               

P: 11SEP2023 156513    47.0N   70.0W 2.0-4.2 AAAAA  Maine                      

 

O: 14SEP2023 18:50:41  29.1N   97.9W mb=4.0  EMSC   SOUTHERN TEXAS               

P: 13SEP2023 156430    28.0N   98.0W 3.0-4.6 ABAAA  Northern Mexico            

 

O: 15SEP2023 02:51:27  36.5N   98.7W ML=2.2  EMSC   OKLAHOMA                     

P: 16SEP2023 156493    38.0N   98.0W 2.0-4.3 ABAAA  Southern Plains            

 

HAWAII

 

O: 15SEP2023 05:07:03  19.2N  155.4W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7SEP2023 156131    18.8N  155.2W 3.0-4.6 CAAAA  Hawaii                     

 

NEIC reported this earthquake of M 3.2 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Naalehu and Mountain View.

STRONG EARTHQUAKE IN WEST CHILE RISE

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 13, 2023

 

The strongest earthquake in the world today was an M 6.1 in the West Chile Rise. It was not reported felt in this remote area. The only earthquake in the past 3 years of larger magnitude than M 6.1 in the West Chile Rise was an M 6.7 ion February 3, 2021. At the time this summary noted in this regard:

 

"This earthquake is the strongest within about 400 km of this epicenter in at least the historical record for the area. Earthquakes in this area of M 6.5 hit on 1934, 1937, 1954, 1975, 1997 and 1999. It occurred within about an hour of local solar midnight, a time when geomagnetic effects are prominent and may have been related to those as well as to tidal stresses which maximize near this hour. … The antipode of this epicenter is in China north of Nepal at

36N 83E" (February 3, 2021)

 

Forecast 156347 had expected today's event within about 100 km was likely around September 9, 2023. This epicenter is at 107 degrees from the M 6.8 in Morocco of September 8 and may have been promoted by energy from that source.

 

O: 13SEP2023 11:49:16  36.3S   97.9W Mw=6.1  EMSC   WEST CHILE RISE              

P:  9SEP2023 156347    36.0S   97.0W 4.0-5.9 BAAAA  Chile Rise                 

 

A moderate M 5.0 also occurred in Eritrea today. It was not reported felt in this region. This may be an aftershock of an M 5.6 which hit the same region on August 1, 2023. At the time this summary noted:

 

 

"The most unusual earthquake of the day today was an M 4.6 in the border region between Eritrea and Ethiopia.  This has been an active area especially during periods of active solar and geomagnetic periods, often showing synchronicity with major solar flares. During the current solar quiet period, however the area has see little moderate seismicity. The last earthquakes of M>=4.6 within about 300 km of this epicenter occurred September 11, 2019 and August 13, 2018. The last event of M>5 in this area was an M 5.6 on July 8, 2013." (June 5, 2022)

 

As expected today’s earthquake occurred at the height of the geomagnetic storm along with several moderate flares and may have been promoted by SFE and other geomagnetic effects. Forecast 156405 had expected enhanced seismicity in mid-September in this region.

 

O: 13SEP2023 17:51:07  15.2N   39.5E mb=5.0  EMSC   ERITREA                      

P: 16SEP2023 156405    12.0N   40.0E 3.5-5.5 BCAAA  Ethiopia                   

 

An M 4.6 aftershock shook Morocco today. NEIC reported it was felt with intensity IV in Morocco at Oulad Teima, Essaouira, Marrakech and III in Taroudannt, Agadir, Ouarzazate, Ben Guerir, Safi, Tiznit, and El Jadida.

A major incidence of earthquake lights has been reported to have occurred in

Morocco shortly before the M 6.8 there on September 8. This has been published in reliable sources. Earthquake lights are often observed in association with major earthquake and have been seen and reported for thousands of years. Many theories try to explain them but the exact cause of these phenomena is still unknown. Thanks to Pam, a reader of this summary for a good summary she sent in this regard. Similar summaries are available on the web for readers to peruse. The death toll from this earthquake is near 3000 with more than 5600 injured. Forecast 156458 had expected enhanced seismicity in this region of Morocco was likely around September 11.

 

O: 14SEP2023 05:53:16  31.0N    8.4W mb=4.6  EMSC   MOROCCO                      

O: 13SEP2023 15:45:07  31.3N    8.2W ML=3.5  EMSC   MOROCCO                      

P: 11SEP2023 156458    30.0N    8.0W 3.5-5.3 AAAAA  Morocco/Spain              

 

A minor swarm of earthquakes occurred in the region of Mt. St. Helens today. This was centered within minutes of local solar noon and may indicate tidal stresses moving magma. Forecast 156539 had expected enhanced seismicity in this region was likely September 11.

 

O: 13SEP2023 21:10:40  46.2N  122.2W MD=2.3  EMSC   MT. ST. HELENS AREA, WASHINGTON

O: 13SEP2023 19:48:08  46.2N  122.2W MD=2.1  EMSC   MT. ST. HELENS AREA, WASHINGTO

P: 11SEP2023 156539    46.9N  122.0W 2.0-4.1 AAAAA  Washington state, U.S.     

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 6.9 in the area of Morocco September 8, 2023, where promoted seismicity is considered likely.

 

Today's projected seismicity map follows for the coming week.

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 13SEP2023 20:11:43  32.4N   48.4E mb=4.2  EMSC   WESTERN IRAN                 

P: 11SEP2023 156489    34.0N   49.0E 3.8-5.4 ABAAA  So. Iran                   

 

O: 13SEP2023 13:23:14  52.3N  158.5E mb=3.8  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 16SEP2023 156551    54.0N  158.0E 4.0-5.8 BBAAA  Kamchatka                  

 

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

 

INDONESIA AND PHILIPPINES

 

O: 13SEP2023 17:09:05   1.9S  120.1E ML=4.3  EMSC   SULAWESI, INDONESIA          

P: 13SEP2023 156373     2.0N  118.0E 3.5-5.0 ACBAA  Malaysia                   

 

O: 14SEP2023 06:19:38  10.8S  113.3E ML=4.4  EMSC   SOUTH OF JAVA, INDONESIA      

P: 12SEP2023 156586    11.0S  116.0E 4.0-5.4 AACAA  So. of Indonesia           

 

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

 

CENTRAL AND SOUTH AMERICA

 

O: 14SEP2023 03:34:20  10.0N   86.4W mb=4.5  EMSC   OFF COAST OF COSTA RICA      

P: 11SEP2023 156414    11.0N   86.0W 3.5-5.2 BAAAA  Nicaragua                  

 

O: 14SEP2023 00:21:35  16.3N   94.7W ML=4.1  EMSC   OAXACA, MEXICO               

O: 13SEP2023 12:50:10  16.9N   95.5W ML=4.0  EMSC   OAXACA, MEXICO

P: 12SEP2023 156402    17.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 14SEP2023 01:48:00  17.9N   66.0W MD=3.1  EMSC   PUERTO RICO REGION           

O: 13SEP2023 09:00:21  18.8N   65.4W MD=3.4  EMSC   PUERTO RICO REGION

O: 13SEP2023 07:45:22  19.4N   65.5W MD=3.4  EMSC   PUERTO RICO REGION

P: 13SEP2023 156408    18.0N   65.0W 3.0-4.9 AAAAA  Leeward Islands            

 

O: 13SEP2023 07:52:39  23.0S   66.4W mb=4.2  EMSC   JUJUY, ARGENTINA             

O: 14SEP2023 02:47:27  23.9S   66.8W mb=4.4  EMSC   JUJUY, ARGENTINA             

P: 18SEP2023 156591    23.0S   67.0W 4.0-5.8 BAAAA  Argentina                  

 

O: 14SEP2023 00:50:16  27.2S   71.2W Mw=4.5  EMSC   OFFSHORE ATACAMA, CHILE      

P: 13SEP2023 156593    26.0S   71.0W 4.0-5.6 ABAAA  Coast Central Chile        

 

AFRICA AND EUROPE

 

O: 14SEP2023 05:38:21  28.0S   26.7E ML=3.1  EMSC   SOUTH AFRICA                 

 

O: 14SEP2023 05:53:16  31.0N    8.4W mb=4.6  EMSC   MOROCCO                      

O: 13SEP2023 15:45:07  31.3N    8.2W ML=3.5  EMSC   MOROCCO                      

P: 11SEP2023 156458    30.0N    8.0W 3.5-5.3 AAAAA  Morocco/Spain              

P: 15SEP2023 156458    31.0N    8.0W 3.5-5.3 AAAAA  Morocco/Spain              

 

O: 13SEP2023 17:51:07  15.2N   39.5E mb=5.0  EMSC   ERITREA                      

P: 16SEP2023 156405    12.0N   40.0E 3.5-5.5 BCAAA  Ethiopia                   

 

O: 13SEP2023 20:40:51  36.6N   40.5E ML=4.5  EMSC   SYRIA                        

P:  9SEP2023 156226    38.0N   39.0E 3.5-5.0 BBAAA  Turkey                     

 

O: 13SEP2023 08:38:18  43.9N   13.4E mb=4.1  EMSC   CENTRAL ITALY                

P: 11SEP2023 156510    43.0N   13.0E 3.0-5.3 AAAAA  Italy                      

 

NEIC reported this earthquake of M 4.1 in Central Italy was felt with intensity II-III in the area(s) of Central Italy in Senigallia, Marken and Spinea, Veneto.

 

O: 13SEP2023 16:09:08  51.6N   16.1E ML=3.4  EMSC   POLAND                       

P: 13SEP2023 156556    52.0N   16.0E 3.0-4.6 AAAAA  Poland                      

 

 

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

 

SOUTHWEST PACIFIC

 

O: 13SEP2023 11:36:55   9.6S  159.9E Mw=5.2  EMSC   SOLOMON ISLANDS              

P:  4SEP2023 156326    11.0S  161.0E 4.0-5.5 CBAAA  Vanuatu Islands            

 

NEIC reported this earthquake of M 5.2 in Solomon Islands was felt with intensity II-III in the area(s) of Solomon Islands in Honiara, Guadalcanal.

 

O: 14SEP2023 00:31:18  21.4S  178.5W mb=4.5  EMSC   FIJI REGION                   

P: 13SEP2023 156601    20.0S  175.0W 4.0-5.4 ABCAA  Tonga Islands              

 

O: 13SEP2023 16:45:04  23.0S  170.0E mb=5.2  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 14SEP2023 156596    21.0S  169.0E 4.0-5.4 ABAAA  Loyalty Islands            

 

OCEAN RIDGES

 

O: 13SEP2023 11:49:16  36.3S   97.9W Mw=6.1  EMSC   WEST CHILE RISE              

P:  9SEP2023 156347    36.0S   97.0W 4.0-5.9 BAAAA  Chile Rise                 

 

 

ZEALANDIA AND AUSTRALIA REGION

 

No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia

today. GeoNet did not report any felt events in the area.

 

JAPAN AND KURIL ISLANDS

 

O: 13SEP2023 09:16:05  48.9N  156.2E mb=4.7  EMSC   EAST OF KURIL ISLANDS        

P: 11SEP2023 156519    49.0N  156.0E 3.5-5.7 AAAAA  NE Pacific                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 13SEP2023 07:26:13  31.2N  115.9W ML=3.1  EMSC   BAJA CALIFORNIA, MEXICO

O: 13SEP2023 22:35:15  30.8N  115.7W ML=3.1  EMSC   BAJA CALIFORNIA, MEXICO      

P: 13SEP2023 156477    30.8N  116.2W 2.5-4.8 AAAAA  So. California             

 

O: 13SEP2023 19:45:54  36.0N  120.5W MD=2.0  EMSC   CENTRAL CALIFORNIA           

P: 12SEP2023 156444    36.1N  120.1W 2.5-4.5 AAAAA  Central California         

 

O: 13SEP2023 12:33:31  40.1N  123.8W MD=2.3  EMSC   NORTHERN CALIFORNIA          

P: 16SEP2023 156445    39.7N  123.7W 2.5-4.6 BAAAA  Central California         

 

NEIC reported an earthquake of M 3.4 in Central California was felt with intensity II-III in the area(s) of Central California in Gonzales, Paicines, Soledad, Hollister, Salinas, Marina, Monterey, Pacific Grove and Santa Cruz.

 

ALASKA

 

No events of M>=3 were located in Alaska today.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 13SEP2023 21:10:40  46.2N  122.2W MD=2.3  EMSC   MT. ST. HELENS AREA, WASHINGTON

O: 13SEP2023 19:48:08  46.2N  122.2W MD=2.1  EMSC   MT. ST. HELENS AREA, WASHINGTO

P: 11SEP2023 156539    46.9N  122.0W 2.0-4.1 AAAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O: 13SEP2023 11:26:52  31.6N  104.6W ML=2.3  EMSC   WESTERN TEXAS                

P: 13SEP2023 156474    31.4N  103.8W 2.0-4.1 AAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 13SEP2023 14:34:11  34.9N   96.0W ML=2.4  EMSC   OKLAHOMA                     

P: 11SEP2023 156492    35.0N   97.0W 2.0-4.2 AAAAA  Southern Plains            

 

HAWAII

 

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

 

 

STRONG EARTHQUAKES SHAKES NORTHERN PHILIPPINES; TAIWAN

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 12, 2023

 

 

The largest earthquake in the world today occurred in the Northern Philippines in the Luzon Strait between the Babyuan Region of the Philippines and Taiwan. NEIC reported it was felt with maximum intensity V in the Cagayan Valley at Aparii, Batal, amd om Cprdo;;era at Sagada, Baguio with lesser shaking of II in Tuguegarao, Cagayan Valley and in Taiwan in Kaohsiung and Taiwan. Strong seismic enhancement had been expected in this region at this time after Supertyphoon Saola passed directly over this epicenter with winds up to 170 kts in late August and early September, 2023 as noted in earlier issues of this summary:

 

"Super-Typhoon SAOLA (09W ) continued today in the area of southern Taiwan and northern Philippines with winds up to 165 kts. It is expected to reverse course and head towards southern Taiwan making landfall there around September 1. Enhanced seismicity in the northern Philippines and Taiwan is likely as Saola passes through the area." (September 1, 2023).

 

It is likely today's earthquake was promoted by stresses associated with Super-Typhoon Saola. It occurred near the height of today's geomagnetic storm when AP at 35 was near minor storm levels. It is likely this also had an effect on the occurrence of this event at this time.

 

PHIVOLCS reported it with M 6.3 while CWB in Taiwan reported it with M 6.7

CWB reported it was felt in Taiwan with intensity II in Kaohsiung, Changhua, Taitung, Yunlin, Tainan and I in Hualien, Nantou, Chiayi, and Penghu Counties, Taiwan. PHIVOLCS reported it was felt throughout northern Luzon, Philippines with maximum intensity VI in Calayan, Cagayan and V in Luna and Pudtol, Apayao; Bacarra, Bangui, Burgos, Demalneg, City of Laoag,Pagudpud, Paoay, Pasuquin, San Nicolas and Vintar, Ilocos Norte; Aparri, Baggao, Camalaniugan, Claveria, Lal-Lo, Pamplong, Sanchez-Mira, Santa Ana, Santa Praxedes and Santa Teresita, Cagayan, Philippines. A foreshock of M 5.0 hit this region yesterday.   An earthquake of M 6.0 hit the Babuyan Islands on June 30, 2022, the last event of M>=6.3 in the area reported by NEIC occurred on May 18m 1993 with M 6.8. An M 7.0 hit south of this on July 27, 2022 with an aftershock of M 6.4 on October 25, 2022. The only other similar event in the region in the past 35 years was an M 6.4 on July 16, 2000. At the time of the M 7.0 in July, 2022, this summary noted:

 

"Today's event of M 7.0 is the strongest within about 300 km of this epicenter since an M 7.3 about 250 km southwest of this on December 11, 1999 and prior to that an M 7.7 about 200 km to the south on July 16, 1990." (July 27, 2022)

 

Forecasts 156136 and 156410 had expected today's event was likely around September 10-11 within about 25 km of today's epicenters. Today’s epicenter in the Babuyan Islands is near 103 degrees from the M 6.8 in Morocco of September 8 and may have been promoted by energy from that source.

 

O: 11SEP2023 17:30:12  19.2N  121.1E mb=5.0  EMSC   BABUYAN ISL REGION, PHILIPPINE

P: 10SEP2023 156136    19.0N  121.0E 3.5-4.9 AAAAA  Luzon, Philippines         

P: 11SEP2023 156410    19.0N  121.0E 3.5-4.9 AAAAA  Luzon, Philippines         

 

O: 12SEP2023 11:03:18  19.3N  121.3E Mw=6.3  EMSC   BABUYAN ISL REGION, PHILIPPINE

O: 12SEP2023 11:03:18  19.3N  121.3E Mw=6.7  BMGC   BABUYAN ISL REGION, PHILIPPINE

O: 12SEP2023 11:03:17  19.3N  121.2E Mw=6.7  CWB    BABUYAN ISL REGION, PHILIPPINE

P: 10SEP2023 156136    19.0N  121.0E 3.5-4.9 AAAAA  Luzon, Philippines         

P: 11SEP2023 156410    19.0N  121.0E 3.5-4.9 AAAAA  Luzon, Philippines         

 

The strongest earthquake in the U.S. or Canada today was an M 5.0 in the central Andreanof Islands, Aleutians, Alaska. NEIC reported it was felt with intensity III in Adak, Alaska. This earthquake occurred within minutes of local solar noon and was probably promoted by strong tidal stresses which maximize near this hour. The last earthquake with M>=5.0 in the Andreanof Islands was an M 5.2 on February 15, 2023. At the time this summary noted:

 

"The strongest earthquake in the U.S. or Canada today was an M 5.2 in the western Andreanof Islands. This is the strongest earthquake in the western Andreanof Islands, Aleutians, Alaska since an M 5.2 on June 6, 2022. The last event in the area of larger magnitude was an M 6.1 on September 24, 2021." (February 15, 2023)

 

Forecast 156543 had expected today's event in the Andreanof Islands within about 50 km of this epicenter was likely around September 12.

 

O: 12SEP2023 23:17:37  51.5N  176.4W mb=5.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 12SEP2023 156543    51.1N  175.8W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

An M 4.9 also occurred in the Unimak Islands, Alaska today. This event occurred about an hour before that in the Andreanof Islands and, like that event,  occurred near local solar noon, probably being promoted by strong tidal stresses. An earthquake of M 5.0 hit the Unimak Island region on August 14, 2023 and was described in this summary at the time as:

 

The strongest earthquake in the U.S. or Canada today was an M 5.0 in Unimak Island, Aleutians, Alaska. NEIC reported and aftershock of M 4.2 in Unimak Island, Alaska was felt with intensity II-III in the area(s) of Unimak Island, Alaska in Akutan. This activity occurred within minutes of local solar noon and was probably  promoted by high tidal stresses with the upcoming new moon. This is the strongest earthquake in the Unimak area since an M 5.1 on September 9 and January 11, 2021. No events of significantly larger magnitude have hit this area in the past 3.5 years." (August 14, 2023)

 

Forecast 156549 had expected today's event within about 100 km was likely in the Unimak Island area around September 15.

 

O: 12SEP2023 21:48:57  54.0N  164.1W mb=4.9  EMSC   UNIMAK ISLAND REGION, ALASKA 

P: 15SEP2023 156549    53.5N  165.8W 3.5-5.0 BAAAA  Fox Islands, Aleutians     

 

An unusually large M 3.3 hit the region of Morgan Hill, Central California today. NEIC reported this earthquake of M 3.3 in Central California was felt with intensity II-III in the area(s) of Central California in Morgan Hill, San Martin, San Jose, Gilroy. This event occurred within minutes of local solar midnight and may have been promoted by strong tidal stresses which maximize near this hour. The last earthquake of M>=3.3 within the region of Morgan Hill with M>=3.3 occurred on August 31, 2023 with M 3.3. At the time this summary reported:

 

"An unusually large M 3.6 earthquake was widely felt in the Morgan Hill area of Central California today. NEIC reported intensity II-III in San Jose, Morgan Hill, Coyote, Mount Hamilton, among others. This is the largest earthquake in this region of California within about 50 km since an M 3.6 on January 23, 2023. The last earthquake of greater magnitude in this area was an M 5.1 on December 5, 2022" (July 30, 2023)

 

Forecast 156174 had expected today's event was likely within this area around

September 9.

 

O: 12SEP2023 08:32:21  37.2N  121.6W ML=3.3  EMSC   NORTHERN CALIFORNIA          

P:  9SEP2023 156174    37.7N  121.9W 2.5-4.4 BAAAA  Central California         

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 6.9 in the area of Morocco September 8, 2023, where promoted seismicity is considered likely.

 

Today's projected seismicity map follows for the coming week.

                         

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 13SEP2023 03:24:36  55.4N  166.2E mb=4.3  EMSC   KOMANDORSKIYE OSTROVA REGION 

P: 13SEP2023 156552    55.0N  164.0E 4.0-5.9 AABAA  Komandorsky Isl            

 

INDONESIA AND PHILIPPINES

 

O: 13SEP2023 05:34:33   5.8S  110.1E Mw=5.1  EMSC   JAVA SEA                     

P: 14SEP2023 156397     8.0S  108.0E 4.0-5.4 ACBAA  So. of Java                

 

O: 12SEP2023 15:01:15   7.8S  120.5E mb=4.6  EMSC   FLORES SEA                   

P: 14SEP2023 156384     8.0S  123.0E 4.0-5.4 AACAA  Flores Island area         

P: 18SEP2023 156399     8.0S  119.0E 4.0-5.5 CABAA  Sumbawa Island area        

 

O: 12SEP2023 11:03:18  19.3N  121.3E Mw=6.3  EMSC   BABUYAN ISL REGION, PHILIPPINE

O: 12SEP2023 11:03:18  19.3N  121.3E Mw=6.7  BMGC   BABUYAN ISL REGION, PHILIPPINE

P: 10SEP2023 156136    19.0N  121.0E 3.5-4.9 AAAAA  Luzon, Philippines         

P: 11SEP2023 156410    19.0N  121.0E 3.5-4.9 AAAAA  Luzon, Philippines         

 

CENTRAL AND SOUTH AMERICA

 

O: 13SEP2023 05:02:32  14.4S   71.5W ML=4.0  EMSC   CENTRAL PERU                 

P: 15SEP2023 156580    14.0S   71.0W 4.0-5.6 AAAAA  Central Peru               

 

O: 12SEP2023 14:25:34  14.9N   93.2W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 12SEP2023 156401    16.0N   93.0W 3.5-5.5 ABAAA  Chiapas, Mexico            

P: 17SEP2023 156401    14.0N   94.0W 3.5-5.6 BAAAA  Chiapas, Mexico            

 

O: 12SEP2023 20:02:26  17.1N   99.5W ML=4.0  EMSC   GUERRERO, MEXICO

O: 13SEP2023 02:24:35  16.5N   98.5W ML=4.4  EMSC   GUERRERO, MEXICO             

P:  8SEP2023 156145    17.0N   98.0W 3.5-5.4 BAAAA  Oaxaca, Mexico             

P: 13SEP2023 156418    18.0N   99.0W 3.5-5.3 ABAAA  Oaxaca, Mexico             

 

O: 13SEP2023 03:40:36  17.6N   94.8W ML=4.1  EMSC   VERACRUZ, MEXICO              

P: 12SEP2023 156402    17.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 13SEP2023 00:53:56  18.3N  105.5W mb=4.6  EMSC   OFF COAST OF JALISCO, MEXICO 

P: 15SEP2023 156404    18.0N  105.0W 3.5-5.1 AAAAA  Coast of Jalisco, Mexico   

 

NEIC reported this earthquake of M 4.6 off Jalisco, Mexico  was felt with intensity II-III in the area(s) of Jalisco, Mexico in Colima (V) and Teoloyucan, Mexico.

 

O: 12SEP2023 08:28:54  19.9N   72.8W ML=3.4  EMSC   HAITI REGION                 

P: 15SEP2023 156422    19.0N   73.0W 3.0-4.6 BAAAA  Bahamas/No. Caribbean      

 

O: 12SEP2023 14:46:50  20.9N  105.7W ML=4.0  EMSC   OFFSHORE NAYARIT, MEXICO     

P: 11SEP2023 156404    19.0N  106.0W 3.5-5.1 ABAAA  Coast of Jalisco, Mexico   

 

O: 12SEP2023 12:19:02  21.6S   68.6W ML=4.0  EMSC   ANTOFAGASTA, CHILE           

P: 12SEP2023 156591    22.0S   68.0W 4.0-6.1 AAAAA  Argentina                  

 

O: 12SEP2023 09:35:24  23.3N  109.6W ML=3.4  EMSC   BAJA CALIFORNIA SUR, MEXICO  

P: 16SEP2023 156425    24.0N  109.0W 3.5-5.2 BAAAA  Gulf of California         

 

O: 12SEP2023 18:38:57  24.1S   66.8W mb=4.1  EMSC   SALTA, ARGENTINA             

P: 18SEP2023 156591    23.0S   67.0W 4.0-5.8 CBAAA  Argentina                  

 

O: 12SEP2023 17:22:32  25.6N  110.0W ML=4.0  EMSC   GULF OF CALIFORNIA           

P: 16SEP2023 156425    24.0N  109.0W 3.5-5.2 BBAAA  Gulf of California         

 

 

AFRICA AND EUROPE

 

O: 13SEP2023 00:05:37  70.6N   14.5W mb=4.6  EMSC   JAN MAYEN ISLAND REGION

O: 13SEP2023 02:33:11  70.6N   14.6W mb=4.7  EMSC   JAN MAYEN ISLAND REGION

O: 13SEP2023 00:06:29  70.4N   14.7W mb=4.9  EMSC   JAN MAYEN ISLAND REGION      

P:  9SEP2023 156311    71.0N   13.0W 3.5-4.9 BAAAA  Jan Mayen Isl. area        

 

O: 12SEP2023 09:39:50  30.8N    8.1W ML=4.0  EMSC   MOROCCO                      

P: 11SEP2023 156458    30.0N    8.0W 3.5-5.3 AAAAA  Morocco/Spain              

 

SOUTHWEST PACIFIC

 

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

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 12SEP2023 18:55:50  36.4S  178.5E ML=4.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 12SEP2023 18:55:51  36.4S  178.4E MS=4.7  GEONET North Island, New Zealand

P: 16SEP2023 156611    37.0S  178.0E 3.0-4.4 BAAAA  North Island, N.Z.         

 

GEONET reported  7 people felt this earthquake with 7 at weak intensity and 0 with light shaking and 0 with moderate intensity 0 with strong, 0 with severe and 0 with extreme intensity.

 

JAPAN AND KURIL ISLANDS

 

O: 12SEP2023 08:57:27  28.1N  130.3E mb=4.9  EMSC   RYUKYU ISLANDS, JAPAN        

P: 14SEP2023 156427    27.0N  130.0E 4.0-5.5 ABAAA  Kyushu Japan               

P: 14SEP2023 156432    29.0N  129.0E 4.0-5.4 AAAAA  Ryukyu Islands             

 

O: 12SEP2023 13:58:01  30.2N  142.2E mb=4.8  EMSC   IZU ISLANDS, JAPAN REGION    

P: 14SEP2023 156423    28.0N  143.0E 4.0-5.5 ACAAA  Bonin Islands              

 

O: 12SEP2023 10:43:55  31.8N  140.7E mb=4.5  EMSC   IZU ISLANDS, JAPAN REGION    

P: 18SEP2023 156469    32.0N  141.0E 4.0-5.4 CAAAA  Off East Coast Honshu      

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 12SEP2023 18:11:38  31.4N  115.4W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO

O: 12SEP2023 20:47:49  30.9N  115.3W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO      

P: 13SEP2023 156477    30.8N  116.2W 2.5-4.8 AAAAA  So. California             

 

O: 12SEP2023 10:48:59  32.6N  117.1W ML=2.0  EMSC   SAN DIEGO CTY URBAN AREA, CALI

P: 15SEP2023 156479    33.0N  117.7W 2.5-4.4 AAAAA  So. California             

P: 18SEP2023 156476    32.0N  117.4W 2.5-4.6 CAAAA  So. California             

 

O: 13SEP2023 05:24:01  33.3N  116.3W ML=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 11SEP2023 156480    33.7N  116.1W 2.5-4.8 AAAAA  So. California             

 

O: 12SEP2023 16:46:03  35.8N  117.6W ML=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 11SEP2023 156487    35.9N  117.7W 2.5-4.7 AAAAA  So. California             

 

O: 12SEP2023 08:32:21  37.2N  121.6W ML=3.3  EMSC   NORTHERN CALIFORNIA          

P:  7SEP2023 156172    37.3N  119.4W 2.5-4.4 BAAAA  California/Nevada area     

P:  9SEP2023 156174    37.7N  121.9W 2.5-4.4 BAAAA  Central California         

 

O: 13SEP2023 00:12:30  37.4N  118.5W MD=2.4  EMSC   CENTRAL CALIFORNIA           

P: 13SEP2023 156440    37.4N  118.6W 2.5-4.6 AAAAA  California/Nevada area     

 

O: 13SEP2023 01:15:27  39.5N  119.6W ML=2.1  EMSC   NEVADA                       

P: 12SEP2023 156443    39.3N  119.6W 2.5-4.4 AAAAA  California/Nevada area     

 

O: 12SEP2023 07:01:48  40.2N  117.8W ML=2.6  EMSC   NEVADA                       

O: 12SEP2023 08:10:59  39.6N  118.1W ML=2.1  EMSC   NEVADA

P:  7SEP2023 156172    39.9N  118.4W 2.5-4.5 BAAAA  California/Nevada area     

 

O: 13SEP2023 05:12:39  40.9N  121.6W MD=2.2  EMSC   NORTHERN CALIFORNIA          

P: 14SEP2023 156525    40.9N  122.0W 2.5-4.4 AAAAA  Northern California        

 

 

ALASKA

 

O: 12SEP2023 23:17:37  51.5N  176.4W mb=5.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 12SEP2023 156543    51.1N  175.8W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

O: 12SEP2023 21:48:57  54.0N  164.1W mb=4.9  EMSC   UNIMAK ISLAND REGION, ALASKA 

P: 15SEP2023 156549    53.5N  165.8W 3.5-5.0 BAAAA  Fox Islands, Aleutians     

 

O: 12SEP2023 10:23:20  55.0N  156.4W ML=3.2  EMSC   SOUTH OF ALASKA              

P: 13SEP2023 156541    54.7N  156.9W 3.5-5.0 AAAAA  Alaska Peninsula           

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 12SEP2023 17:25:18  47.6N  117.7W ML=2.7  EMSC   WASHINGTON                    

P: 19SEP2023 156517    47.7N  117.4W 2.0-3.9 CAAAA  Montana/Idaho              

 

NEIC reported this earthquake of M 2.7 in Washington State was felt with intensity II-III in the area(s) of Washington State in Fairchild AFB, Medical Lake, Airway Heights, Spokane, Nine Mile Falls.

 

O: 13SEP2023 06:46:43  61.4N  140.0W mb=4.1  EMSC   SOUTHERN YUKON TERRITORY, CANA

P:  6SEP2023 156298    61.3N  140.1W 3.2-4.9 CAAAA  Central Alaska             

 

ROCKY MOUNTAINS REGION

 

O: 12SEP2023 09:26:37  31.5N  104.2W ML=2.4  EMSC   WESTERN TEXAS

O: 13SEP2023 05:18:30  31.6N  104.4W ML=2.7  EMSC   WESTERN TEXAS

O: 12SEP2023 17:19:15  31.7N  104.4W ML=2.8  EMSC   WESTERN TEXAS                

P: 13SEP2023 156474    31.4N  103.8W 2.0-4.1 AAAAA  SW U.S.A                    

 

O: 12SEP2023 15:34:09  32.7N  100.7W ML=2.8  EMSC   WESTERN TEXAS                

P: 17SEP2023 156475    31.4N  102.2W 2.0-4.1 BBBAA  SW U.S.A                   

 

O: 12SEP2023 22:01:06  34.2N  107.0W ML=2.8  EMSC   NEW MEXICO                    

P: 12SEP2023 156473    34.7N  109.0W 2.0-4.3 AABAA  SW U.S.A                   

 

NEIC reported this earthquake of M 2.8 in New Mexico was felt with intensity II-III in the area(s) of New Mexico with IV in Lemitar and Socorro.

 

O: 12SEP2023 17:19:14  48.3N  116.7W MD=2.2  EMSC   NORTHERN IDAHO               

P: 19SEP2023 156517    47.7N  117.4W 2.0-3.9 CAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

No earthquakes of M>=1 were located in the Eastern U.S. or Canada today.

 

HAWAII

 

O: 12SEP2023 11:02:16  19.2N  155.5W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7SEP2023 156131    18.8N  155.2W 3.0-4.6 BAAAA  Hawaii                     

 

NEIC reported this earthquake of M 3.1 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Naalehu.

 

 

STRONG QUAKES CONTINUE IN INDONESIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 11, 2023

 

The strongest earthquake in the world today was an M 6.0-6.1 in Halmahera, Indonesia. NEIC reported it was felt in Sulawesi, Indonesia with III in Manado, Tomohon and Mobagu, Sulawesi and possibly in Southern Mindanao, Philippines.  BMG reported it was was felt with intensity III-IV in Manado, Sangihe, Kotamobagu, Bitung, Talaud, Jaillil; III in Ternate, Halmahera, Sula, II-III in Gorontalo, Minahas, Ternate, Taliabu, Ambon, and II in Namlea, Tomohon, and Bone Bolango, Indonesia. The last earthquake in Halmahera of M>=6.0 occurred about 200 km northeast of today's epicenter in Halmahera as an M 5.3 on February 23, 2023. At the time this summary noted in this regard:

 

"This epicenter is about 150 km northeast of the M 7.0 in the Molucca Sea of January 18, 2023 and the strongest within about 150 km in the area since an M 6.4 on June 4, 2020. The only event within this region of M>=6.8 in the past 35 years was an M 6.8 on April 19, 1993." (February 23, 2023)

 

Forecast 156100 had expected today's event was likely within about 150 km was likely around September 10, 2023.

 

O: 11SEP2023 12:51:33   1.1N  127.5E Mw=6.0  EMSC   HALMAHERA, INDONESIA         

O: 11SEP2023 09:33:37   1.3N  126.2E ML=4.1  EMSC   MOLUCCA SEA

P: 10SEP2023 156100     2.0N  126.0E 4.0-5.4 AABAA  Mindanao, Philippines      

 

An earthquake of M 5.9 also occurred today in the Central Mid-Atlantic Ridge area. It was not reported felt in this remote area. This is near the antipode of the M 6.0 in Indonesia today and may have been promoted by energy associated with that event. The last earthquake of M>=5.9 within about 200 km of this epicenter was an M  6.9 on September 18, 2020. At the time this summary noted in this regard:

 

 

"Strong earthquakes in the mid-Atlantic in the past month have included an M 6.5 about 300 km west of today's event on August 30 and an M 6.6 more than 1000 km to the northwest on September 6, 2020. The last earthquake within about 250 km  of today's event in the central mid-Atlantic with M>=6.7 occurred more than  30 years ago, this being the strongest quake in the area since an M 6.7 on October 7, 1975 - the largest historical event recorded in this region and the only other such event of M>=6.7." (September 18, 2020)

 

 

Forecast 156092 had expected enhanced seismicity in this area was likely  around September 8, 2023.

 

O: 11SEP2023 09:20:57   0.8N   26.1W Mw=5.9  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P:  8SEP2023 156092     1.0N   28.0W 4.0-5.4 BABAA  Central Mid-Atlantic Ridg  

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in the area

South of Alaska near the Alaska Peninsula. It was not reported felt in this remote area. This is the strongest earthquake within about 200 km of this epicenter since an M 4.8 on April 24, 2023 and an M 5.0 on January 10, 2023, the only such events in the region since September 2022.  Forecast 156541 had expected today's event was likely around September 13 within  about 50 km of this  epicenter.

 

O: 12SEP2023 05:23:16  55.1N  156.4W mb=4.7  EMSC   SOUTH OF ALASKA              

P: 13SEP2023 156541    54.7N  156.9W 3.5-5.0 AAAAA  Alaska Peninsula           

 

An unusual earthquake of M 3.0 hit northern Nunavut, Canada today near Grise Fiord. It was not reported felt in this remote area where it occurred near local solar midnight, a time when tidal stresses may have helped promote enhanced seismicity. This is the first earthquake within about 300 km of this epicenter reported by NEIC since an M 4.0 on August 18, 2008. Forecast 156309 had expected today's event within about 25 km around September 5.

 

O: 10SEP2023 06:42:43  80.3N   89.6W MB=3.0  ECAN of Grise Fiord, NU             

P:  5SEP2023 156309    80.0N   90.0W 4.0-5.7 BAAAA  Arctic Ocean Region        

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 6.9 in the area of Morocco September 8, 2023, where promoted seismicity is considered likely.

 

Today's projected seismicity map follows for the coming week.

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 11SEP2023 17:32:00  24.4N   94.9E mb=4.9  EMSC   MYANMAR-INDIA BORDER REGION  

P:  3SEP2023 156158    24.0N   94.0E 4.0-5.5 CAAAA  Myanmar                    

 

NEIC reported this earthquake of M 4.9 in Myanmar was felt with intensity II-III in the area(s) of Bangladesh with IV in Silhat and in Gauhati Assam also with IV and lesser shaking in Manipur, Sibsagar, and Itanagar India.

 

O: 11SEP2023 20:32:41  20.8N  101.1E ML=4.1  EMSC   LAOS                         

P: 20SEP2023 156429    20.0N   96.0E 4.0-5.4 CACAA  Myanmar                    

 

O: 11SEP2023 22:51:07  55.5N  166.5E Mw=5.3  EMSC   KOMANDORSKIYE OSTROVA REGION 

P:  5SEP2023 156287    55.0N  166.0E 4.0-5.8 CAAAA  Komandorsky Isl            

P: 13SEP2023 156552    55.0N  164.0E 4.0-5.9 AABAA  Komandorsky Isl            

 

INDONESIA AND PHILIPPINES

 

BMG  reported an earthquake of M 3.1 in Java was felt with intensity II-III in the area(s) of Java at Cilaku, Karangtengah and Cianjur.

 

O: 11SEP2023 12:51:33   1.1N  127.5E Mw=6.0  EMSC   HALMAHERA, INDONESIA         

O: 11SEP2023 09:33:37   1.3N  126.2E ML=4.1  EMSC   MOLUCCA SEA

P: 10SEP2023 156100     2.0N  126.0E 4.0-5.4 AABAA  Mindanao, Philippines      

 

O: 11SEP2023 18:23:38   2.1N   98.9E ML=4.0  EMSC   NORTHERN SUMATRA, INDONESIA  

P: 12SEP2023 156376     3.0N   97.0E 4.0-5.7 AABAA  Nicobar Islands            

 

O: 11SEP2023 08:23:40   5.1S  144.7E mb=4.5  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P: 11SEP2023 156395     4.0S  143.0E 4.0-5.5 ABBAA  Papua New Guinea            

P: 13SEP2023 156395     3.0S  144.0E 4.0-5.4 ACAAA  Papua New Guinea           

 

O: 11SEP2023 22:09:28   5.6N   94.9E mb=4.6  EMSC   NORTHERN SUMATRA, INDONESIA  

P:  5SEP2023 156102     5.0N   95.0E 4.0-5.9 CAAAA  Nicobar Islands            

P: 15SEP2023 156376     4.0N   95.0E 4.0-5.9 BBAAA  Nicobar Islands            

 

O: 11SEP2023 12:27:29   7.0S  129.7E ML=4.4  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 14SEP2023 156379     7.0S  127.0E 4.0-5.4 BABAA  Banda Sea                  

 

O: 11SEP2023 17:30:12  19.2N  121.1E mb=5.0  EMSC   BABUYAN ISL REGION, PHILIPPINE

P: 10SEP2023 156136    19.0N  121.0E 3.5-4.9 AAAAA  Luzon, Philippines         

P: 11SEP2023 156410    19.0N  121.0E 3.5-4.9 AAAAA  Luzon, Philippines         

 

CENTRAL AND SOUTH AMERICA

 

O: 12SEP2023 02:42:30  11.4N   86.1W ML=4.7  EMSC   NEAR COAST OF NICARAGUA      

P: 11SEP2023 156414    11.0N   86.0W 3.5-5.2 AAAAA  Nicaragua                  

 

O: 12SEP2023 02:40:51  15.2N   93.4W Mw=5.1  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 12SEP2023 156401    16.0N   93.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

NEIC reported this earthquake of M 5.1 in Chiapas, Mexico was felt with intensity II-III in the area(s) of Chiapas, Mexico in Salina Cruz, Oaxaca and Istahuacan, Huehuetenango, Guatemala.

 

O: 11SEP2023 10:29:19  15.9N   96.4W ML=4.0  EMSC   OAXACA, MEXICO               

P: 12SEP2023 156417    15.0N   97.0W 3.5-5.4 AAAAA  Oaxaca, Mexico             

 

O: 12SEP2023 04:04:57  16.6N   98.4W ML=4.0  EMSC   GUERRERO, MEXICO

O: 11SEP2023 21:28:56  16.3N   98.1W ML=4.2  EMSC   OAXACA, MEXICO               

P:  8SEP2023 156145    17.0N   98.0W 3.5-5.4 BAAAA  Oaxaca, Mexico             

 

O: 12SEP2023 04:33:16  17.3N  100.4W ML=4.0  EMSC   GUERRERO, MEXICO             

P: 14SEP2023 156418    16.0N  100.0W 3.5-5.6 ABAAA  Oaxaca, Mexico             

 

O: 11SEP2023 18:23:36  17.4N  101.4W ML=3.6  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 14SEP2023 156412    19.0N  102.0W 3.5-5.4 BAAAA  Michoacan, Mexico          

 

O: 11SEP2023 11:51:47  19.1N   70.9W ML=3.0  EMSC   DOMINICAN REPUBLIC           

O: 11SEP2023 10:29:01  19.7N   71.2W ML=3.1  EMSC   DOMINICAN REPUBLIC           

P:  9SEP2023 156147    19.0N   71.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 12SEP2023 04:58:39  20.6S   68.6W Mw=5.4  EMSC   TARAPACA, CHILE              

P:  9SEP2023 156339    20.0S   71.0W 4.0-5.4 BABAA  So. Peru/Bolivia           

P: 12SEP2023 156591    22.0S   68.0W 4.0-6.1 ABAAA  Argentina                  

 

NEIC reported this earthquake of M 5.4 in Northern Chile was felt with intensity II-III in the area(s) of Northern Chile in Tarapaca at Arica and Iquique and in Calama, Antofagasta.

 

O: 11SEP2023 21:40:22  20.8S   65.4W mb=4.1  EMSC   POTOSI, BOLIVIA              

P:  9SEP2023 156329    22.0S   67.0W 4.0-5.5 ABBAA  Argentina                  

 

O: 11SEP2023 13:37:08  27.2S   71.2W Mw=5.3  EMSC   OFFSHORE ATACAMA, CHILE      

P: 11SEP2023 156594    29.0S   71.0W 4.0-5.5 ABAAA  Coast Central Chile        

 

NEIC reported this earthquake of M 5.4 in Atacama, Chile was felt with intensity II-III in the area(s) of Atacama, Chile in Copiapo.

 

 

AFRICA AND EUROPE

 

O: 12SEP2023 00:25:37  31.1N    8.4W ML=3.5  EMSC   MOROCCO

O: 11SEP2023 19:47:45  31.3N    8.1W mb=3.8  EMSC   MOROCCO

O: 11SEP2023 19:47:45  31.3N    8.1W mb=4.0  ANSS   MOROCCO

P:  5SEP2023 156187    37.0N   10.0W 3.5-5.1 BCAAA  Morocco/Spain              

 

NEIC reported this earthquake of M 4.0 in Morocco was felt with intensity II-III in the area(s) of Morocco in Marrakech.

 

O: 11SEP2023 08:01:53  43.5N   45.1E mb=4.2  EMSC   CAUCASUS REGION, RUSSIA      

P: 10SEP2023 156235    43.0N   44.0E 3.5-4.9 AAAAA  Caucasus/Caspian Sea       

 

O: 11SEP2023 13:21:26  46.1N   13.7E ML=3.4  EMSC   SLOVENIA                     

P: 12SEP2023 156503    46.0N   14.0E 3.0-4.9 AAAAA  Austria                    

 

O: 11SEP2023 19:02:55  63.7N   23.3W ML=3.5  EMSC   ICELAND REGION               

P:  4SEP2023 156303    63.0N   23.0W 3.0-4.4 CAAAA  Iceland area               

 

O: 11SEP2023 17:49:47  75.5N    9.8E mb=3.4  EMSC   GREENLAND SEA                

P: 14SEP2023 156579    74.0N   14.0E 3.0-4.6 BBAAA  Norway                     

 

SOUTHWEST PACIFIC

 

O: 11SEP2023 10:56:11   8.1S  158.4E mb=4.7  EMSC   SOLOMON ISLANDS              

P:  5SEP2023 156120     7.0S  155.0E 4.0-5.5 CBCAA  Solomon Islands            

 

O: 12SEP2023 01:18:55  10.1S  161.4E Mw=5.1  EMSC   SOLOMON ISLANDS              

P:  4SEP2023 156326    11.0S  161.0E 4.0-5.5 CAAAA  Vanuatu Islands            

 

O: 12SEP2023 01:38:55  22.3S  169.7E mb=5.0  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 14SEP2023 156596    21.0S  169.0E 4.0-5.4 ABAAA  Loyalty Islands            

 

OCEAN RIDGES

 

O: 11SEP2023 09:20:57   0.8N   26.1W Mw=5.9  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P:  8SEP2023 156092     1.0N   28.0W 4.0-5.4 BABAA  Central Mid-Atlantic Ridg  

 

ZEALANDIA AND AUSTRALIA REGION

 

No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia

today. GeoNet did not report any felt events in the area.

 

JAPAN AND KURIL ISLANDS

 

O: 11SEP2023 18:30:09  24.5N  127.8E mb=4.5  EMSC   SOUTHEAST OF RYUKYU ISLANDS  

P:  7SEP2023 156160    26.0N  128.0E 4.0-5.4 BBAAA  Ryukyu Islands             

 

O: 11SEP2023 16:46:12  29.3N  129.4E mb=5.0  EMSC   RYUKYU ISLANDS, JAPAN        

P: 12SEP2023 156427    29.0N  130.0E 4.0-5.4 AAAAA  Kyushu Japan               

 

O: 12SEP2023 01:00:05  35.3N  141.3E mb=4.4  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 10SEP2023 156197    35.0N  142.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

O: 11SEP2023 23:41:30  37.8N  141.8E ML=4.2  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 11SEP2023 156471    38.0N  142.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

 

O: 12SEP2023 01:00:34  46.0N  152.2E mb=4.7  EMSC   EAST OF KURIL ISLANDS        

P:  7SEP2023 156269    47.0N  153.0E 3.5-5.4 BAAAA  So. Kurils                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 11SEP2023 08:25:51  30.9N  115.4W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO

O: 11SEP2023 09:09:18  30.6N  116.2W ML=3.6  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O: 11SEP2023 07:02:31  30.8N  115.3W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO      

O: 11SEP2023 10:00:54  31.3N  116.1W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO      

O: 11SEP2023 20:32:34  31.6N  116.1W ML=3.5  EMSC   BAJA CALIFORNIA, MEXICO       

P: 13SEP2023 156477    30.8N  116.2W 2.5-4.8 AAAAA  So. California             

 

O: 11SEP2023 09:20:15  33.5N  116.5W ML=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 11SEP2023 156480    33.7N  116.1W 2.5-4.8 AAAAA  So. California             

 

O: 12SEP2023 06:00:42  35.4N  119.4W ML=2.0  EMSC   CENTRAL CALIFORNIA           

P: 11SEP2023 156484    35.0N  119.2W 2.5-4.4 AAAAA  So. California             

 

O: 11SEP2023 20:49:57  36.2N  120.8W MD=2.1  EMSC   CENTRAL CALIFORNIA           

P: 16SEP2023 156444    36.4N  121.1W 2.5-4.5 BAAAA  Central California         

 

O: 11SEP2023 09:35:33  39.3N  122.8W MD=2.5  EMSC   NORTHERN CALIFORNIA          

P: 12SEP2023 156445    39.2N  123.1W 2.5-4.7 AAAAA  Central California         

 

O: 11SEP2023 09:30:57  39.9N  121.0W MD=2.3  EMSC   NORTHERN CALIFORNIA

O: 12SEP2023 06:29:31  40.2N  121.2W MD=2.4  EMSC   NORTHERN CALIFORNIA

O: 11SEP2023 07:17:49  39.9N  121.0W MD=2.4  EMSC   NORTHERN CALIFORNIA          

P: 14SEP2023 156525    40.9N  122.0W 2.5-4.4 BAAAA  Northern California        

 

NEIC reported this earthquake of M 2.5 in Northern California was felt with intensity II-III in the area(s) of Northern California in Meadow Valley and Quincy.

 

O: 12SEP2023 06:59:02  40.2N  117.7W ML=2.0  EMSC   NEVADA                        

P: 14SEP2023 156504    41.3N  118.7W 2.5-4.6 AAAAA  California/Nevada area     

 

O: 11SEP2023 18:48:34  41.0N  121.6W MD=2.0  EMSC   NORTHERN CALIFORNIA          

P: 13SEP2023 156525    40.6N  122.4W 2.5-4.5 AAAAA  Northern California         

P: 14SEP2023 156525    40.9N  122.0W 2.5-4.4 BAAAA  Northern California        

 

ALASKA

 

O: 12SEP2023 05:23:16  55.1N  156.4W mb=4.7  EMSC   SOUTH OF ALASKA              

P: 13SEP2023 156541    54.7N  156.9W 3.5-5.0 AAAAA  Alaska Peninsula            

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 12SEP2023 02:51:13  50.7N  130.5W ML=3.2  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 13SEP2023 156546    50.5N  130.4W 3.0-4.9 AAAAA  British Colombia           

 

ROCKY MOUNTAINS REGION

 

O: 11SEP2023 07:45:29  31.7N  104.4W ML=2.2  EMSC   WESTERN TEXAS

O: 11SEP2023 11:32:28  31.7N  104.4W ML=3.0  EMSC   WESTERN TEXAS

O: 12SEP2023 01:29:06  31.5N  104.2W ML=2.1  EMSC   WESTERN TEXAS                

P: 13SEP2023 156474    31.4N  103.8W 2.0-4.1 AAAAA  SW U.S.A                   

 

O: 11SEP2023 11:59:15  32.7N  109.1W ML=2.8  EMSC   ARIZONA                      

P: 12SEP2023 156473    34.7N  109.0W 2.0-4.3 ABAAA  SW U.S.A                   

 

NEIC reported this earthquake of M 2.8 in Arizona was felt with intensity II-III in the area(s) of Arizona in Thatcher and in Lordsburg, New Mexico.

 

EASTERN U.S./CANADA

 

O: 11SEP2023 20:07:23  29.1N   97.9W ML=3.1  EMSC   SOUTHERN TEXAS

O: 11SEP2023 23:49:24  29.1N   97.9W ML=3.0  EMSC   SOUTHERN TEXAS

O: 11SEP2023 23:56:08  29.0N   97.9W ML=2.8  EMSC   SOUTHERN TEXAS               

P: 13SEP2023 156430    28.0N   98.0W 3.0-4.6 AAAAA  Northern Mexico            

 

NEIC reported these earthquakes of M 3.1 and M 3.2 in Southern Texas were felt with intensity II-III in the area(s) of Southern Texas in Floresville, San Antonia and San Marcos.

 

O: 11SEP2023 10:05:18  35.0N   97.6W ML=2.2  EMSC   OKLAHOMA                     

P: 11SEP2023 156492    35.0N   97.0W 2.0-4.2 AAAAA  Southern Plains            

 

O: 11SEP2023 07:35:47  45.1N   74.1W MB=2.5  ECAN of Huntingdon, QC              

P:  8SEP2023 156253    45.7N   75.2W 2.0-4.0 BAAAA  New York State             

 

O: 10SEP2023 07:07:47  49.4N   68.0W MB=1.4  ECAN of Franquelin, QC              

P: 11SEP2023 156513    49.3N   67.5W 2.0-4.2 AAAAA  Maine                      

 

O: 10SEP2023 06:42:43  80.3N   89.6W MB=3.0  ECAN of Grise Fiord, NU             

P:  5SEP2023 156309    80.0N   90.0W 4.0-5.7 BAAAA  Arctic Ocean Region        

 

O:  9SEP2023 19:01:27  47.8N   69.8W MB=1.0  ECAN of Saint-Sim├⌐on, QC           

P:  9SEP2023 156251    47.3N   70.5W 2.0-4.1 AAAAA  New England                

 

O:  9SEP2023 11:31:18  43.6N   70.8W MB=2.0  ECAN of Portland, ME                

P:  6SEP2023 156245    44.4N   68.2W 2.0-4.4 BABAA  Maine                      

 

HAWAII

 

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

 

ATERSHOCKS CONTINUE IN MOROCCO

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 10, 2023

 

An aftershock of M 4.2 shook areas of Morocco today. NEIC reported it was felt with intensity II-III in Morocco at Taoudannt, Marrakech, Agadir, Ouarzazate. Safi, Casablanca and Bouznika. More than 3000 confirmed deaths occurred with the M 6.8  earthquake of September 8, 2023. In the previous issue of this summary the tolls from the earthquake Morocco had been noted as:

 

"Death tolls continued to rise in the M 6.8 earthquake in Morocco. The reported number of dead in this earthquake is now more than 2100. An earthquake in Morocco in 1960 killed more than 12,000. BBC reports total destruction in many remote villages, so the tolls are expected to rise.  This is the most deadly earthquake in the world since the M 7.7 in Turkey of February 6, 2023 which reportedly killed 53560. The previous most deaths in recent earthquakes occurred in Sulawesi on September 28, 2018 (4340) and Nepal on April 25, 2-15 (8964), the only other comparable events in the past 10 years in the world.

 

Detailed description of the mainshock in Morocco can be found in the previous issue of this summary. Light aftershocks continued but did little damage today. Forecast 156187 had expected regional seismic enhancement in Morocco was likely in early September. Far field seismic enhancement today from Morocco appears to have hit Sulawesi (M 6.3) and Bali (M 5.8) in Indonesia (120 degrees - node 3); Sumatra (M 4.1, 4.2, 4.6) (103 degrees), Costa Rica (M 4.6 node 5 72 degrees); the Galapagos (m 4.5, 4.6, 4.7) (node 4 90 degrees);  and the Virgin Islands M 3.9 node 7 - 52 degrees)." (September 10, 2023)

 

O: 10SEP2023 08:00:01  31.0N    8.5W mb=4.2  EMSC   MOROCCO                      

P:  5SEP2023 156187    37.0N   10.0W 3.5-5.1 BCAAA  Morocco/Spain              

 

An eruption of Mt. Kilauea volcano in Hawaii today followed an M 3.5 near local solar noon. This is the third eruption of Kilauea this year and is substantial with many lava flow and ash. Forecast 1556131 had expected enhanced seismicity in Hawaii was likely around September 7.

 

NEIC reported this earthquake of M 3.5 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Hawaii National Park.

 

O: 11SEP2023 00:47:18  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 11SEP2023 00:48:22  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 11SEP2023 00:49:45  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 11SEP2023 01:26:58  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7SEP2023 156131    18.8N  155.2W 3.0-4.6 BAAAA  Hawaii                     

 

The largest earthquakes in the world today were of M 5.3 - in the Kermadec Islands and in the Ryukyu Islands, Japan. Neither is unusual nor felt in their respective regions. Forecasts 156160 and 156156 expected the activity in the Ryukyu Islands in early September while forecast 156334 had expected the event in the Kermadec Islands within about 25 km was likely around September 8.

 

O: 10SEP2023 17:58:27  31.1N  131.5E mb=4.7  EMSC   KYUSHU, JAPAN                

O: 10SEP2023 15:02:03  29.3N  129.5E Mw=5.3  EMSC   RYUKYU ISLANDS, JAPAN        

O: 10SEP2023 22:57:57  29.4N  129.3E ML=4.1  EMSC   RYUKYU ISLANDS, JAPAN

P:  5SEP2023 156160    29.0N  128.0E 4.0-5.6 BAAAA  Ryukyu Islands             

P:  7SEP2023 156156    29.0N  131.0E 4.0-5.6 BABAA  Kyushu Japan               

 

O: 10SEP2023 15:03:18  29.0S  177.3W Mw=5.3  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  8SEP2023 156334    29.0S  177.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

A series of three moderate earthquakes were felt in Iraq today. NEIC reported this earthquake of M 4.7 in Iraq was felt with intensity II-III in the area(s) of Iraq in Chamchamal and Mossul (IV) and in Kirkuk, Irbil, Baghdad, Mehabad and ash Shikhan. The last earthquake with M>=4.7 within about 150 km of this epicenter in Iraq was recorded on March 16, 2023 (M 5.1) and on February 4, 2023 (M 4.7) -  two days before the massive earthquakes in Turkey of February 6 (M 7.7+) after a two-year hiatus of seismicity at moderate levels in the area. Today's activity occurred near local solar midnight and may have been promoted by tidal stresses which are new maximum at this hour. Forecasts 156219 and 156227 had expected today's activity Iraq was like in early September.

 

O: 10SEP2023 21:42:48  35.1N   44.7E ML=4.6  EMSC   IRAQ

O: 10SEP2023 21:43:49  35.1N   44.8E mb=4.7  EMSC   IRAQ                         

P:  6SEP2023 156219    33.0N   46.0E 3.8-5.3 BCAAA  So. Iran                   

 

O: 10SEP2023 21:44:13  36.4N   43.8E ML=4.4  EMSC   IRAQ                         

P:  1SEP2023 156227    38.0N   43.0E 3.5-4.9 CBAAA  Turkey                     

 

The largest earthquake in the U.S. or Canada today was an M 4.9 in the region of the Alaska Peninsula. It was reported felt with intensity II in Sand Point, Alaska. Alaska Peninsula. This appears to be an aftershock of the M 5.1 which occurred August 30, 2023. At the time this summary noted:

 

 

"The largest earthquake in the U.S. or Canada today was an M 5.1 in the Alaska Peninsula. NEIC reported it was felt with intensity II-III in Alaska at Sand Point and King Cove. While a foreshock of M 4.6 hit this same area on August 28, 2023 near local solar noon, this  may be an aftershock of the M 7.4 on July 16 and  M 5.6 which hit the same area with the previous full moon on August 3, 2023 as noted in previous issues of this summary:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.6 off the Alaska Peninsula where NEIC reported it was felt with intensity IV in King Cove. This is the largest earthquake in the Alaska Peninsula area within about 150 km of this epicenter since an M 5.6 on August 3, 2023.

 

and

 

 

"The strongest earthquake in the world, the U.S. or Canada today was an M 5.6 in the Unimak Island area of Alaska. NEIC reported it was felt with intensity IV in Sand Point, King Cove and II-III in False Pass, Chignik Lagoon, Alaska. This is the strongest aftershock to date of the M 7.2-7.4 of July 16, 2023 in the Alaska Peninsula about 50 km east of today's epicenter." (August 30, 2023)

 

Forecast 156295 had expected today's event within about 50 was likely around

September 10.

 

O: 10SEP2023 13:03:53  54.3N  161.0W mb=4.9  EMSC   ALASKA PENINSULA             

P: 10SEP2023 156295    54.6N  161.7W 3.5-5.1 AAAAA  Unimak Islands, Aleutians  

 

A moderate earthquake of M 4.4 also occurred today in the Northwest Territories, Canada. It was probably felt lightly in the epicentra area near Nahanni Butte but this has not been reported. The last earthquake with M>=4.4 within about 200 km  of today's epicenter occurred on October 24, 2020 with M 4.7. Like today's event that earthquake occurred with an M 4.9 in the Alaska Peninsula. At the time this summary noted:

 

 

"The series of moderate earthquakes in the Northwest Territories, Canada continued today with events of M 4.5-4.7 and M 4.0. This continues recent activation of this epicenter which included an M 5.1 on October 14 and an M 4.3 on October 18. The only other event in the region in the past year with M>=4.7 occurred as an M 4.7 on July 25, 2020, three days after the M 7.8 mainshock in the Alaska Peninsula." (October 24, 2020)

 

and

 

The strongest earthquake in the U.S. or Canada  today was an M 4.4 in the Northwest Territories of Canada. The only earthquake in the past six years within about 300 km of this epicenter with M>=4.4 was an M 4.7 on July 25, 2020. Prior to that earthquakes of M 4.4 and 4.5 occurred in March and July, 2014 in this area. The strongest earthquake in this area in the past 30 years was an M 5.6 on June 10, 1990." (October 24, 2020)

 

Forecast 156306 had expected today's event within about 25 km was likely in early September.

 

O: 11SEP2023 00:12:37  61.9N  124.1W MB=4.4  ECAN of Nahanni Butte, NT  

O: 11SEP2023 00:12:37  61.9N  124.1W ML=4.4  EMSC   NORTHWEST TERRITORIES, CANADA

P:  2SEP2023 156306    62.1N  124.2W 2.5-4.3 CAAAA  Northwest Terr., Canada    

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 6.9 in the area of Morocco September 8, 2023, where promoted seismicity is considered likely.

 

Today's projected seismicity map follows for the coming week.

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 10SEP2023 21:42:48  35.1N   44.7E ML=4.6  EMSC   IRAQ

O: 10SEP2023 21:43:49  35.1N   44.8E mb=4.7  EMSC   IRAQ                          

P:  6SEP2023 156219    33.0N   46.0E 3.8-5.3 BCAAA  So. Iran                   

 

O: 10SEP2023 21:44:13  36.4N   43.8E ML=4.4  EMSC   IRAQ                         

P:  1SEP2023 156227    38.0N   43.0E 3.5-4.9 CBAAA  Turkey                      

 

O: 11SEP2023 01:54:38  40.1N   71.7E mb=4.5  EMSC   KYRGYZSTAN                   

P:  8SEP2023 156243    41.0N   77.0E 4.0-5.5 BACAA  Kirgizstan/Xinjiang        

 

O: 10SEP2023 07:33:29  54.8N  111.5E mb=4.0  EMSC   LAKE BAYKAL REGION, RUSSIA    

P:  3SEP2023 156292    56.0N  110.0E 3.0-4.5 CBAAA  So. Siberia                

 

INDONESIA AND PHILIPPINES

 

O: 10SEP2023 10:21:00   1.6N  127.0E mb=4.9  EMSC   HALMAHERA, INDONESIA         

P: 10SEP2023 156100     2.0N  126.0E 4.0-5.4 AAAAA  Mindanao, Philippines      

 

O: 11SEP2023 06:14:21   3.1S  139.8E mb=4.9  EMSC   PAPUA, INDONESIA

O: 10SEP2023 15:25:20   2.0S  140.0E ML=4.1  EMSC   NEAR N COAST OF PAPUA, INDONES

P:  7SEP2023 156115     3.0S  140.0E 4.0-5.4 BAAAA  Papua New Guinea           

 

O: 10SEP2023 22:38:29   2.6N  127.2E ML=4.4  EMSC   MOLUCCA SEA

O: 10SEP2023 15:30:29   2.7S  128.7E ML=4.1  EMSC   CERAM SEA, INDONESIA

O: 10SEP2023 07:13:04   2.5N  127.1E mb=4.5  EMSC   MOLUCCA SEA                  

P: 10SEP2023 156100     2.0N  126.0E 4.0-5.4 AAAAA  Mindanao, Philippines      

 

O: 10SEP2023 20:17:28   3.7S  140.2E ML=4.2  EMSC   PAPUA, INDONESIA             

P:  7SEP2023 156115     3.0S  140.0E 4.0-5.4 BAAAA  Papua New Guinea           

 

O: 10SEP2023 19:44:30   4.6N  126.2E ML=4.1  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  3SEP2023 156101     5.0N  126.0E 4.0-5.4 CAAAA  Mindanao, Philippines      

 

O: 10SEP2023 21:58:14   6.0S  130.7E mb=4.4  EMSC   BANDA SEA                    

P:  3SEP2023 156105     8.0S  129.0E 4.0-5.4 CBBAA  Banda Sea                  

 

O: 10SEP2023 19:43:13   8.0S  126.4E ML=4.1  EMSC   KEPULAUAN BARAT DAYA, INDONESIA

O: 10SEP2023 21:46:47   6.8S  125.0E mb=4.5  EMSC   BANDA SEA                    

P:  7SEP2023 156105     7.0S  125.0E 4.0-5.5 BAAAA  Banda Sea                  

 

 

CENTRAL AND SOUTH AMERICA

 

O: 10SEP2023 08:51:30   8.3N   82.9W ML=4.2  EMSC   PANAMA-COSTA RICA BORDER REGIO

P: 10SEP2023 156095     7.0N   78.0W 4.0-5.9 ABCAA  Colombia                   

 

O: 10SEP2023 15:35:35   8.4S   76.4W ML=4.1  EMSC   CENTRAL PERU                 

P:  5SEP2023 156114     8.0S   78.0W 4.0-5.7 BABAA  No. Peru                   

 

O: 10SEP2023 11:34:34  10.9N   62.4W mb=4.7  EMSC   OFFSHORE SUCRE, VENEZUELA    

P:  7SEP2023 156149    11.0N   63.0W 3.4-4.9 BAAAA  Windward Islands           

 

NEIC reported this earthquake of M 4.7 in Venezuela  was felt with intensity II-III in the area(s) of   Trinidad and Tobago and Grenada.

 

O: 11SEP2023 05:51:00  16.0N   94.1W ML=4.3  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 10SEP2023 11:28:11  15.6N   95.2W ML=4.2  EMSC   OFFSHORE OAXACA, MEXICO      

P:  8SEP2023 156126    15.0N   95.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O: 10SEP2023 18:38:37  17.5N   70.4W ML=3.2  EMSC   DOMINICAN REPUBLIC REGION    

P:  9SEP2023 156147    19.0N   71.0W 3.4-5.1 ABAAA  Puerto Rico                

 

O: 10SEP2023 08:50:31  18.4N   64.5W MD=4.0  EMSC   VIRGIN ISLANDS REGION        

P:  6SEP2023 156133    18.0N   65.0W 3.0-5.1 BAAAA  Leeward Islands            

 

NEIC reported this earthquake of M 4.1 in the Virgin Islands was felt with intensity II-III in the area(s) of Puerto Rico.

 

O: 11SEP2023 06:09:46  18.8N   68.4W MD=3.6  EMSC   DOMINICAN REPUBLIC REGION

O: 10SEP2023 08:37:43  18.9N   68.3W MD=3.4  EMSC   DOMINICAN REPUBLIC REGION

O: 10SEP2023 12:01:31  19.1N   68.4W MD=3.2  EMSC   DOMINICAN REPUBLIC REGION

O: 10SEP2023 20:49:56  18.7N   68.2W MD=3.4  EMSC   DOMINICAN REPUBLIC REGION    

P:  9SEP2023 156147    18.0N   69.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 10SEP2023 12:32:07  19.1N  105.4W ML=4.0  EMSC   OFFSHORE JALISCO, MEXICO     

P:  9SEP2023 156127    18.0N  106.0W 3.5-5.1 ABAAA  Coast of Jalisco, Mexico   

 

O: 10SEP2023 20:02:57  19.6N   64.9W MD=3.6  EMSC   VIRGIN ISLANDS REGION        

P:  6SEP2023 156150    20.0N   63.0W 3.0-4.4 BABAA  Bahamas/No. Caribbean      

 

O: 10SEP2023 17:31:29  20.2N   72.6W ML=3.5  EMSC   HAITI REGION                 

P:  6SEP2023 156151    20.0N   73.0W 3.0-4.6 BAAAA  Bahamas/No. Caribbean      

 

O: 10SEP2023 14:26:06  21.2N  106.2W ML=4.1  EMSC   ISLAS MARIAS REG., NAYARIT, ME

P:  9SEP2023 156127    18.0N  106.0W 3.5-5.1 ACAAA  Coast of Jalisco, Mexico   

 

O: 10SEP2023 09:55:07  27.9S   66.6W mb=4.6  EMSC   CATAMARCA, ARGENTINA         

P:  6SEP2023 156330    28.0S   67.0W 4.0-5.8 BAAAA  Argentina                  

 

O: 11SEP2023 04:28:18  29.4S   68.1W Mw=4.3  EMSC   LA RIOJA, ARGENTINA          

P:  2SEP2023 156330    29.0S   68.0W 4.0-5.9 CAAAA  Argentina                  

P:  6SEP2023 156330    28.0S   67.0W 4.0-5.8 BBAAA  Argentina                  

 

O: 10SEP2023 07:38:15  30.0S   71.3W mb=4.4  EMSC   COQUIMBO, CHILE              

O: 10SEP2023 18:55:13  31.3S   68.7W mb=4.7  EMSC   SAN JUAN, ARGENTINA          

P:  6SEP2023 156348    30.0S   72.0W 4.0-5.6 BAAAA  Coast Central Chile        

 

NEIC reported this earthquake of M 4.4 in Coquimbo, Chile was felt with intensity II-III in the area(s) of Coquimbo, Chile in Coquimbo and La Serena.

 

O: 11SEP2023 01:56:48  32.1S   71.6W mb=4.8  EMSC   OFFSHORE COQUIMBO, CHILE      

P:  7SEP2023 156345    34.0S   72.0W 4.0-5.4 BBAAA  Central Chile              

 

 

AFRICA AND EUROPE

 

O: 10SEP2023 08:00:01  31.0N    8.5W mb=4.2  EMSC   MOROCCO                      

P:  5SEP2023 156187    37.0N   10.0W 3.5-5.1 BCAAA  Morocco/Spain               

 

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

 

SOUTHWEST PACIFIC

 

O: 10SEP2023 12:52:47  17.8S  175.5W mb=4.1  EMSC   TONGA

O: 11SEP2023 04:16:05  18.2S  177.7W mb=4.6  EMSC   FIJI REGION                  

P:  8SEP2023 156325    17.0S  179.0W 4.0-5.5 BBAAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 10SEP2023 07:46:06   2.4N  102.1W mb=4.6  EMSC   GALAPAGOS TRIPLE JUNCTION REGI

 

O: 11SEP2023 05:14:00  55.8S   27.2W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  7SEP2023 156362    58.0S   26.0W 4.0-6.0 BCAAA  So. Sandwich Islands       

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 10SEP2023 15:03:18  29.0S  177.3W Mw=5.3  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  8SEP2023 156334    29.0S  177.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

O: 10SEP2023 16:30:20  32.8S  177.7W mb=4.7  EMSC   SOUTH OF KERMADEC ISLANDS

O: 10SEP2023 22:36:52  32.9S  179.2W mb=4.6  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  8SEP2023 156355    32.0S  178.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

 

O: 11SEP2023 03:43:30  35.7S  179.5E ML=4.2  EMSC   OFF E. COAST OF N. ISLAND, N.Z.

P:  7SEP2023 156349    37.0S  180.0E 3.5-4.9 BBAAA  E. of North Islands N.Z.   

P:  7SEP2023 156356    34.0S  179.0E 4.0-5.4 BBAAA  So. Kermadec Islands        

 

JAPAN AND KURIL ISLANDS

 

O: 10SEP2023 17:58:27  31.1N  131.5E mb=4.7  EMSC   KYUSHU, JAPAN                

O: 10SEP2023 15:02:03  29.3N  129.5E Mw=5.3  EMSC   RYUKYU ISLANDS, JAPAN        

O: 10SEP2023 22:57:57  29.4N  129.3E ML=4.1  EMSC   RYUKYU ISLANDS, JAPAN

P:  5SEP2023 156160    29.0N  128.0E 4.0-5.6 BAAAA  Ryukyu Islands             

P:  7SEP2023 156156    29.0N  131.0E 4.0-5.6 BABAA  Kyushu Japan               

 

O: 10SEP2023 19:53:15  37.5N  134.7E mb=4.0  EMSC   SEA OF JAPAN                  

P:  8SEP2023 156192    38.0N  135.0E 3.5-4.9 AAAAA  No. Honshu, Japan          

 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 10SEP2023 16:05:02  30.8N  115.7W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO

O: 10SEP2023 21:16:33  30.6N  116.2W ML=3.6  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O: 10SEP2023 14:34:15  31.2N  115.6W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO      

P:  7SEP2023 156204    30.9N  116.2W 2.5-4.4 BAAAA  So. California             

 

O: 11SEP2023 06:09:17  33.8N  116.1W ML=2.5  EMSC   SOUTHERN CALIFORNIA

O: 10SEP2023 14:28:42  33.2N  116.8W ML=2.9  EMSC   SOUTHERN CALIFORNIA          

P:  6SEP2023 156205    32.4N  115.8W 2.5-4.5 BAAAA  So. California             

 

NEIC reported the earthquake of M 2.9-3.0  in Southern California was felt with intensity II-III in the area(s) of Southern California in Santa Ysabel, Warner Springs, Valley Center, Escondido, Ramona.

NEIC reported the earthquake of M 2.6 in Southern California was felt with intensity II-III in the area(s) of Southern California in Indio, Coachella, La Quinta, Palm Desert, Desert Center, Murrieta, San Diego, Studio City.

 

O: 10SEP2023 08:52:10  38.2N  117.8W ML=2.0  EMSC   NEVADA                       

P:  7SEP2023 156171    38.2N  118.2W 2.5-4.5 BAAAA  California/Nevada area     

 

O: 11SEP2023 02:38:21  40.6N  123.5W MD=2.3  EMSC   NORTHERN CALIFORNIA          

P:  9SEP2023 156177    39.7N  123.7W 2.5-4.6 AAAAA  Central California         

 

O: 10SEP2023 14:26:46  40.8N  121.9W MD=2.2  EMSC   NORTHERN CALIFORNIA          

O: 11SEP2023 05:05:00  41.0N  121.6W MD=2.2  EMSC   NORTHERN CALIFORNIA

P:  8SEP2023 156256    40.4N  122.2W 2.5-4.4 AAAAA  Northern California        

 

ALASKA

 

O: 10SEP2023 12:16:24  51.9N  174.6W ML=3.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  7SEP2023 156280    52.3N  171.3W 3.5-5.1 AABAA  Andreanoff Isls, Aleutians 

 

O: 10SEP2023 13:03:53  54.3N  161.0W mb=4.9  EMSC   ALASKA PENINSULA             

P: 10SEP2023 156295    54.6N  161.7W 3.5-5.1 AAAAA  Unimak Islands, Aleutians  

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 11SEP2023 00:12:37  61.9N  124.1W MB=4.4  ECAN of Nahanni Butte, NT  

O: 11SEP2023 00:12:37  61.9N  124.1W ML=4.4  EMSC   NORTHWEST TERRITORIES, CANADA

P:  2SEP2023 156306    62.1N  124.2W 2.5-4.3 CAAAA  Northwest Terr., Canada     

 

ROCKY MOUNTAINS REGION

 

O: 11SEP2023 00:23:35  31.6N  104.3W ML=2.8  EMSC   WESTERN TEXAS

O: 10SEP2023 17:18:53  31.6N  104.4W ML=2.5  EMSC   WESTERN TEXAS                

P:  8SEP2023 156201    32.6N  103.6W 2.0-4.1 AAAAA  SW U.S.A                    

 

O: 10SEP2023 23:46:13  37.2N  104.8W mb=3.6  EMSC   COLORADO                     

O: 11SEP2023 02:53:58  37.2N  104.8W ML=3.3  EMSC   COLORADO

P:  8SEP2023 156179    36.9N  105.1W 2.0-4.0 AAAAA  Colorado area              

 

NEIC reported this earthquake of M 3.3 in Southern Colorado was felt with intensity II-III in the area(s) of Southern Colorado in Weston, Aguilar, Trinidad and Walsenburg.

An M 3.6 was also felt in the region today with intensity IV felt in Colorado at Weston and Trinidaa.

 

O: 10SEP2023 10:28:31  44.7N  111.0W ML=2.5  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P:  8SEP2023 156274    44.2N  110.3W 2.0-3.9 AAAAA  Yellowstone/Wyoming        

 

EASTERN U.S./CANADA

 

O: 10SEP2023 07:44:14  29.0N   97.8W ML=2.8  EMSC   SOUTHERN TEXAS                

P:  5SEP2023 156159    28.0N   98.0W 3.0-4.8 BAAAA  Northern Mexico            

 

HAWAII

 

O: 11SEP2023 00:47:18  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 11SEP2023 00:48:22  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 11SEP2023 00:49:45  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 11SEP2023 01:26:58  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7SEP2023 156131    18.8N  155.2W 3.0-4.6 BAAAA  Hawaii                     

 

STRONG EARTHQUAKE IN SULAWESI, INDONESIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 9, 2023

 

The strongest earthquake in the world today was an M 6.0-6.3 in Sulawesi, Indonesia. NEIC reported it was felt with intensity VI in Palu, Indonesia.

BMG reported this earthquake with M 6.3 was felt with intensity IV in Palu; V-VI Donggala, III in Poso, Sigi, Tolitoli, II-III in Pohuwatu, Kab. Gorontalo and Timur. This may be a strong aftershock of the Sulawesi earthquake of September 28, 2018 of M 7.5. That event was reported to have killed more than 4340 people. This earthquake occurred near local solar midnight and may have been promoted by strong tidal stresses which are greatest near this hour. Forecast 156091 had expected today's event within about 200 km was likely around September 6, 2023. This epicenter is located near the third node (120 degrees) from the M 6.8 in Morocco and may have been promoted by energy from that source. An M 5.8 at this same distance from Morocco hit Bali yesterday.

 

O:  9SEP2023 14:43:24   0.0S  119.9E Mw=6.0  EMSC   MINAHASA, SULAWESI, INDONESIA

O:  9SEP2023 14:43:24   0.0S  119.8E Mw=6.3  BMG    MINAHASA, SULAWESI, INDONESIA

P:  6SEP2023 156091     0.0N  122.0E 4.0-5.4 BABAA  Celebes Sea                

 

Death tolls continued to rise in the M 6.8 earthquake in Morocco. The reported number of dead in this earthquake is now more than 2100. An earthquake in Morocco in 1960 killed more than 12,000. BBC reports total destruction in many remote villages, so the tolls are expected to rise.  This is the most deadly earthquake in the world since the M 7.7 in Turkey of February 6, 2023 which reportedly killed 53560. The previous most deaths in recent earthquakes occurred in Sulawesi on September 28, 2018 (4340) and Nepal on April 25, 2-15 (8964), the only other comparable events in the past 10 years in the world.

 

Detailed description of the mainshock in Morocco can be found in the previous issue of this summary. Light aftershocks continued but did little damage today. Forecast 156187 had expected regional seismic enhancement in Morocco was likely in early September. Far field seismic enhancement today from Morocco appears to have hit Sulawesi (M 6.3) and Bali (M 5.8) in Indonesia (120 degrees - node 3); Sumatra (M 4.1, 4.2, 4.6) (103 degrees), Costa Rica (M 4.6 node 5 72 degrees); the Galapagos (m 4.5, 4.6, 4.7) (node 4 90 degrees); and the Virgin Islands M 3.9 node 7 - 52 degrees).

 

O: 09SEP2023 13:58:05  31.3N    8.1W mb=3.5  EMSC   MOROCCO

O: 10SEP2023 06:36:10  31.3N    8.1W mb=3.2  EMSC   MOROCCO

O: 09SEP2023 13:48:51  31.4N    7.7W mb=3.6  EMSC   MOROCCO

O: 09SEP2023 23:11:36  31.5N    8.2W mb=3.2  EMSC   MOROCCO

O: 09SEP2023 20:09:23  31.0N    8.5W mb=3.2  EMSC   MOROCCO

O:  9SEP2023 11:19:13  31.3N    8.2W ML=3.6  EMSC   MOROCCO                       

P:  5SEP2023 156187    37.0N   10.0W 3.5-5.1 BCAAA  Morocco/Spain              

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 in the Rat Islands, Aleutians, Alaska. It was not reported felt in this remote region. The last earthquake of larger magnitude in the Rat Islands occurred east of this epicenter with M 5.0 on July 19 and this may be a regional aftershock of that event. Forecast 156291 had expected today's event was likely within about 100 km of this around September 8, 2023.

 

O:  9SEP2023 18:06:00  51.6N  177.8E mb=4.8  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  8SEP2023 156291    51.0N  176.0E 4.0-5.7 AAAAA  Rat Islands                

 

An M 2.7 earthquake occurred today in Illinois and Indiana. NEIC reported it was felt with maximum intensity IV in Hazleton, Indiana with II-III shaking in Indiana at Bloomington, and in Illinois at Calhoun, Sumner, Claremont, Olney, Mount Carmel, Albion, Carterville and Springfield among others. This is the strongest earthquake in Illinois since an M 2.8 on April 13, 2022.

At the time this summary noted:

 

 

"An unusual earthquake of M 2.6-2.8 was widely felt today in southern Illinois. NEIC reported it was felt with maximum intensity IV in Springerton and II-III in Burnt Prairie, McLeanboro, Carmi, Fairfield and in Indiana at Evansville and Vincennes. This is the strongest earthquake in the region of Illinois within about 100 km of this epicenter since an M 2.6 on September 11, 2019 but the last of larger magnitude in this region was an M 3.8 on September 19, 2017." (April 13, 2022)

 

The event in Illinois in April, 2022, like today's accompanied moderate quake in the Rat Islands (M 4.6) and an M 4.9 in the Andreanof Islands.

 

Forecast 156190 had expected enhanced seismicity in this region of Illinois was likely in early September.

 

O: 10SEP2023 04:11:00  38.6N   88.0W ML=2.5  EMSC   ILLINOIS                     

O: 10SEP2023 04:11:00  38.6N   88.0W ML=2.7  ANSS   ILLINOIS                     

P:  5SEP2023 156190    37.0N   88.0W 2.0-4.1 BBAAA  New Madrid area            

P:  6SEP2023 156190    38.0N   91.0W 2.0-3.9 BABAA  New Madrid area            

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 6.9 in the area of Morocco September 8, 2023, where promoted seismicity is considered likely.

 

Today's projected seismicity map follows for the coming week.

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O:  9SEP2023 10:18:29  24.6N   92.7E mb=4.8  EMSC   INDIA-BANGLADESH BORDER REGION

P:  3SEP2023 156158    24.0N   94.0E 4.0-5.5 CAAAA  Myanmar                    

P:  4SEP2023 156158    27.0N   92.0E 4.0-5.4 BCAAA  Myanmar                    

 

NEIC reported this earthquake of M 4.8 in India-Bangladesh was felt with intensity II-III in the area(s) of India-Bangladesh in Assam India with V in Silchar and Gauhati and IV in Shillong, Meghahaya and III in Karimganj. It was also felt in Silhat, Banglades with intensity II.

 

O: 10SEP2023 00:10:53  30.4N   94.9E mb=4.5  EMSC   EASTERN XIZANG               

O: 10SEP2023 04:01:13  30.3N   94.8E mb=4.4  EMSC   EASTERN XIZANG

P:  4SEP2023 156217    32.0N   95.0E 3.5-4.9 CBAAA  So. China                  

 

O: 10SEP2023 05:20:48  36.5N   71.3E mb=4.2  EMSC   HINDU KUSH REGION, AFGHANISTAN

P:  8SEP2023 156182    36.0N   71.0E 3.8-5.2 AAAAA  Hindu Kush/Pakistan        

 

INDONESIA AND PHILIPPINES

 

O:  9SEP2023 14:43:24   0.0S  119.9E Mw=6.0  EMSC   MINAHASA, SULAWESI, INDONESIA

O:  9SEP2023 14:43:24   0.0S  119.8E Mw=6.3  BMG    MINAHASA, SULAWESI, INDONESIA

P:  6SEP2023 156091     0.0N  122.0E 4.0-5.4 BABAA  Celebes Sea                

 

O: 10SEP2023 03:55:21   1.1N   97.1E ML=4.1  EMSC   NIAS REGION, INDONESIA       

O: 10SEP2023 03:55:22   1.1N   97.2E ML=4.2  BMG    NIAS REGION, INDONESIA       

P:  8SEP2023 156102     1.0N   97.0E 4.0-5.5 AAAAA  Nicobar Islands            

 

BMG reported this earthquake was felt with intensity II in Gunung Sitol, Indonesia.

 

O:  9SEP2023 17:30:59   1.6N   99.7E mb=4.6  EMSC   NORTHERN SUMATRA, INDONESIA  

P:  8SEP2023 156103     2.0N   99.0E 4.0-5.6 AAAAA  So. Sumatera               

 

O:  9SEP2023 19:23:48   2.0S  139.3E ML=4.2  EMSC   NEAR N COAST OF PAPUA, INDONES

P:  7SEP2023 156115     3.0S  140.0E 4.0-5.4 AAAAA  Papua New Guinea           

 

O: 10SEP2023 05:42:39   2.4N  127.6E mb=4.9  EMSC   MOLUCCA SEA                  

P: 10SEP2023 156100     2.0N  126.0E 4.0-5.4 AABAA  Mindanao, Philippines      

 

O: 10SEP2023 04:41:32   5.5S  147.0E mb=4.9  EMSC   EASTERN NEW GUINEA REG., P.N.G

P:  9SEP2023 156116     4.0S  143.0E 4.0-5.6 ABCAA  Papua New Guinea            

 

O:  9SEP2023 13:24:39   6.6S  129.8E ML=4.0  EMSC   BANDA SEA                    

P:  3SEP2023 156105     8.0S  129.0E 4.0-5.4 CBAAA  Banda Sea                  

 

O:  9SEP2023 10:11:54  12.0N  143.8E mb=4.6  EMSC   GUAM REGION                   

P:  7SEP2023 156148    12.0N  141.0E 4.0-5.4 AACAA  So. Marianas/Guam          

 

O: 10SEP2023 00:41:15  17.4N  145.8E mb=4.6  EMSC   ALAMAGAN REG, N. MARIANA ISLAN

P:  7SEP2023 156142    18.0N  145.0E 4.0-5.6 BAAAA  No. Marianas               

P: 10SEP2023 156142    16.0N  145.0E 4.0-5.5 ABAAA  No. Marianas               

 

 

CENTRAL AND SOUTH AMERICA

 

O:  9SEP2023 09:31:05   8.5N   82.9W ML=4.6  EMSC   PANAMA-COSTA RICA BORDER REGIO

P: 10SEP2023 156095     7.0N   78.0W 4.0-5.9 ABCAA  Colombia                    

 

O: 10SEP2023 05:37:47  14.8N   94.5W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO

O:  9SEP2023 11:45:18  15.4N   94.8W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

O:  9SEP2023 09:50:19  15.6N   95.1W ML=4.5  EMSC   OFFSHORE OAXACA, MEXICO       

P:  8SEP2023 156126    15.0N   95.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O:  9SEP2023 09:51:57  16.1S   74.8W mb=4.3  EMSC   NEAR COAST OF SOUTHERN PERU  

P: 10SEP2023 156314    15.0S   71.0W 4.0-5.6 ABCAA  Central Peru               

 

O: 09SEP2023 12:57:04  15.8N   96.2W ML=4.1  EMSC   OAXACA, MEXICO

O: 09SEP2023 13:57:56  15.9N   96.6W mb=4.5  EMSC   OAXACA, MEXICO

O:  9SEP2023 12:24:24  16.3N   95.9W mb=4.2  EMSC   OAXACA, MEXICO               

P:  6SEP2023 156144    16.0N   96.0W 3.5-5.4 BAAAA  Oaxaca, Mexico             

 

NEIC reported this earthquake of M 4.5 in Oaxaca, Mexico was felt with intensity II-III in the area(s) of Oaxaca, Mexico in Oaxaca.

 

O: 10SEP2023 06:11:09  18.0N  102.6W ML=4.0  EMSC   OFFSHORE MICHOACAN, MEXICO   

P:  7SEP2023 156138    18.0N  102.0W 3.5-5.3 BAAAA  Michoacan, Mexico          

 

O: 09SEP2023 17:19:56  18.4N   73.5W ML=3.5  EMSC   HAITI REGION

O:  9SEP2023 12:36:59  18.3N   73.5W ML=3.4  EMSC   HAITI REGION                 

P:  6SEP2023 156151    20.0N   73.0W 3.0-4.6 BBAAA  Bahamas/No. Caribbean      

 

O: 09SEP2023 11:51:38  18.9N   65.0W MD=3.2  EMSC   VIRGIN ISLANDS REGION

O: 09SEP2023 11:27:53  19.0N   65.1W MD=3.4  EMSC   VIRGIN ISLANDS REGION

O: 09SEP2023 09:36:49  19.2N   66.5W MD=3.2  EMSC   PUERTO RICO REGION

O: 10SEP2023 01:47:14  19.7N   64.7W MD=3.9  EMSC   VIRGIN ISLANDS REGION

O:  9SEP2023 11:53:21  18.9N   65.0W MD=3.4  EMSC   VIRGIN ISLANDS REGION        

P:  6SEP2023 156133    18.0N   65.0W 3.0-5.1 BAAAA  Leeward Islands            

 

O: 10SEP2023 04:24:59  18.9N   68.1W MD=3.4  EMSC   DOMINICAN REPUBLIC REGION    

P:  9SEP2023 156147    18.0N   69.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 10SEP2023 00:59:08  21.4S   68.5W ML=4.0  EMSC   ANTOFAGASTA, CHILE           

P:  9SEP2023 156332    22.0S   69.0W 4.0-5.8 AAAAA  Coast No. Chile            

 

O:  9SEP2023 08:14:06  32.4S   69.9W mb=4.3  EMSC   MENDOZA, ARGENTINA           

P:  4SEP2023 156348    31.0S   70.0W 4.0-5.8 BBAAA  Central Chile              

 

NEIC reported this earthquake of M 4.3 in Argentina was felt with intensity II-III in the area(s) of  San Bernardo, Metropolitana, Chile.

 

O:  9SEP2023 20:03:13  33.9S   71.2W mb=4.0  EMSC   REGION METROPOLITANA, CHILE  

P:  7SEP2023 156345    34.0S   72.0W 4.0-5.4 AAAAA  Central Chile              

 

NEIC reported this earthquake of M 4.0 in Santiago, Chile was felt with intensity II-III in the area(s) of Santiago, Chile in Puente Alto and Lampa.

 

AFRICA AND EUROPE

 

O: 09SEP2023 13:58:05  31.3N    8.1W mb=3.5  EMSC   MOROCCO

O: 10SEP2023 06:36:10  31.3N    8.1W mb=3.2  EMSC   MOROCCO

O: 09SEP2023 13:48:51  31.4N    7.7W mb=3.6  EMSC   MOROCCO

O: 09SEP2023 23:11:36  31.5N    8.2W mb=3.2  EMSC   MOROCCO

O: 09SEP2023 20:09:23  31.0N    8.5W mb=3.2  EMSC   MOROCCO

O:  9SEP2023 11:19:13  31.3N    8.2W ML=3.6  EMSC   MOROCCO                      

P:  5SEP2023 156187    37.0N   10.0W 3.5-5.1 BCAAA  Morocco/Spain              

 

O:  9SEP2023 18:21:30   1.4S   26.7E mb=4.6  EMSC   DEMOCRATIC REPUBLIC OF THE CON

P:  4SEP2023 156111     6.0S   30.0E 3.0-4.4 BCCAA  Lake Victoria area         

 

NEIC reported an earthquake of M 3.5 in South Africa was felt with intensity II-III in the area(s) of South Africa in Gauteng at Alberton, Boksburg and Brakpan.

 

SOUTHWEST PACIFIC

 

O:  9SEP2023 18:06:18  21.1S  178.5W mb=4.5  EMSC   FIJI REGION                  

P:  3SEP2023 156340    21.0S  179.0W 4.0-5.4 CAAAA  Tonga Islands              

P:  7SEP2023 156341    22.0S  175.0W 4.0-5.6 AACAA  Tonga Islands              

 

O:  9SEP2023 16:37:40  24.6S  176.3W mb=4.6  EMSC   SOUTH OF FIJI ISLANDS        

O: 09SEP2023 11:52:10  24.8S  175.3W mb=4.8  EMSC   SOUTH OF TONGA

P:  6SEP2023 156342    24.0S  177.0W 4.0-5.4 BAAAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 09SEP2023 08:28:35   2.1N  101.8W mb=4.6  EMSC   GALAPAGOS TRIPLE JUNCTION REGION

O:  9SEP2023 08:20:05   2.2N  102.0W mb=4.7  EMSC   GALAPAGOS TRIPLE JUNCTION REGI

O:  9SEP2023 11:56:50   3.1N  101.0W mb=4.5  EMSC   GALAPAGOS TRIPLE JUNCTION REGI

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  9SEP2023 15:22:43  44.9S  167.6E ML=3.9  EMSC   SOUTH ISLAND OF NEW ZEALAND  

P:  8SEP2023 156360    44.0S  168.0E 3.0-4.9 AAAAA  So. Island, N.Z.           

 

No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia

today. GeoNet did not report any felt events in the area.

 

JAPAN AND KURIL ISLANDS

 

O: 09SEP2023 09:28:31  29.4N  129.2E mb=4.7  EMSC   RYUKYU ISLANDS, JAPAN

O: 10SEP2023 05:28:35  29.3N  129.3E mb=4.8  EMSC   RYUKYU ISLANDS, JAPAN        

P:  5SEP2023 156160    29.0N  128.0E 4.0-5.6 BAAAA  Ryukyu Islands             

P:  7SEP2023 156156    29.0N  131.0E 4.0-5.6 BABAA  Kyushu Japan               

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

 

O:  9SEP2023 10:55:38  30.5N  116.1W ML=3.3  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O:  9SEP2023 10:58:37  31.2N  115.8W ML=3.0  EMSC   BAJA CALIFORNIA, MEXICO      

P:  7SEP2023 156204    30.9N  116.2W 2.5-4.4 AAAAA  So. California             

 

O:  9SEP2023 21:35:56  32.1N  116.2W ML=2.9  EMSC   BAJA CALIFORNIA, MEXICO       

P:  6SEP2023 156205    32.4N  115.8W 2.5-4.5 BAAAA  So. California             

 

O: 10SEP2023 01:40:44  37.4N  122.5W MD=2.4  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  7SEP2023 156175    37.8N  122.6W 2.5-4.4 BAAAA  Central California         

P:  9SEP2023 156174    37.7N  121.9W 2.5-4.4 AAAAA  Central California         

 

O: 10SEP2023 05:01:17  38.5N  119.5W MD=2.0  EMSC   CENTRAL CALIFORNIA           

P:  9SEP2023 156173    39.3N  120.0W 2.5-4.7 AAAAA  California/Nevada area     

 

O:  9SEP2023 07:12:15  41.0N  121.6W MD=2.4  EMSC   NORTHERN CALIFORNIA          

O: 09SEP2023 14:47:59  41.0N  121.6W MD=2.0  EMSC   NORTHERN CALIFORNIA

P:  8SEP2023 156256    40.4N  122.2W 2.5-4.4 AAAAA  Northern California        

 

ALASKA

 

O:  9SEP2023 18:06:00  51.6N  177.8E mb=4.8  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  8SEP2023 156291    51.0N  176.0E 4.0-5.7 AAAAA  Rat Islands                

 

O:  9SEP2023 09:45:14  59.9N  153.5W ML=3.2  EMSC   SOUTHERN ALASKA              

P:  6SEP2023 156301    60.2N  153.2W 3.2-5.2 BAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

No events of M>=2 were located in the northwestern U.S. or western Canada today.

 

ROCKY MOUNTAINS REGION

 

O: 10SEP2023 04:17:24  37.0N  105.0W ML=2.9  EMSC   COLORADO                      

P:  8SEP2023 156179    36.9N  105.1W 2.0-4.0 AAAAA  Colorado area              

 

EASTERN U.S./CANADA

 

O: 10SEP2023 04:11:00  38.6N   88.0W ML=2.5  EMSC   ILLINOIS                     

O: 10SEP2023 04:11:00  38.6N   88.0W ML=2.7  ANSS   ILLINOIS                     

P:  5SEP2023 156190    37.0N   88.0W 2.0-4.1 BBAAA  New Madrid area            

P:  6SEP2023 156190    38.0N   91.0W 2.0-3.9 BABAA  New Madrid area            

 

HAWAII

 

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

 

 

SERIES OF STRONG EARTHQUAKES HITS AROUND THE WORLD

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 8, 2023

 

World seismic map looks a bit red today? That is because a series of moderately large to large earthquakes shook up much of the world today. These began with an M 6.2 in Coquimbo, Chile yesterday which was followed today by events of M 6.6 in the Kermadec Islands, New Zealand, M 5.6 in Bali, Indonesia, M 5.5 off eastern Honshu, Japan; M 6.8-6.9 in Morocco, M 5.8 and 5.6 in Jalisco, Mexico.

an M 5.8 in the Central East Pacific Rise; and an M 6.0 in Minahaasa, Suawesi, Indonesia (Sept 9 - see tomorrow's summary for more details). In general the average magnitude of larger earthquakes in the world today was nearly 1.0 magnitude units above the average of the past three months.

 

These earthquakes followed a period of relative quiet in the world's seismicity documented in previous issues of this summary as likely associated with the  strong geomagnetic storm of early September. Among these this summary noted:

 

 

"It was a very quiet day in global seismicity today.  This occurred as a geomagnetic storm, the first of this intensity in nearly a month began. Storms such as this can disrupt the ring currents in the ionosphere and reduce subsequent induced seismicity. If this is the case, the next several days are also likely to see reduced seismicity as a minor geomagnetic storm is expected September 3 by SWPC. This will probably trigger a moderately long period of reduced seismicity ending around September 6-7 depending on how long this geomagnetic storm lasts. Aurora could be visible at middle latitudes such as the central portion of the U.S. with these storms. Enhanced seismicity is likely to return in the second week of September, 2023." (September 2, 2023)

 

and

 

"No earthquakes were reported felt in the world in the past 24 hours according to NEIC data. This is the first time this has occurred in at least 10 years with global AP of 36 and high latitude AP of 58. This occurred while the geomagnetic field was at its most disturbed condition since global AP reached 76 with high latitude AP at 58 on April 24, 2023. Strong disturbance in the geomagnetic field disrupts ring currents and resulting induced telluric currents under them while it is in effect. This can considerably reduce global geomagnetic triggering and larger earthquakes. The influx of particles associated with these storms eventually become incorporated into renewed ring currents and normally produce elevated seismicity several days after such disturbances begin." (September 3, 2023)

 

 

A rare earthquake of M 6.9 struck the area of Marrakech, Morocco today.

World press outlets reported at least 2000 were killed in this earthquake -

The strongest in Morocco in recorded history. At least 1832 people were initially reported by Morocco's Interior Ministry to have been injured in the quake among which were 1220 with critical injuries but this number is much higher now. Damage was considerable with many structures destroyed. Most of the deaths and destruction occurred in the province of Al Haouz near the epicenter but deaths were also recorded in Taroudant, Chichaaoua, Marrackesh, Agadir, Casablanca among others. Damage included extensive damage to the 12th sentruy Koutobia Mosque in Marakesh.   It occurred near local solar noon and was followed by an M 4.9 19 minutes later.  NEIC reported maximum intensity VII in Morocco at Marrakesh, El Kealaa and Taroudannt with VI in Oulad Teima, Quarzazate,, V in Youssoufia, Ben Guerir, Agadir, Essaouria, Ben Guerir, Agadir, Essauira, Safi, Sidi, Tisnit, Fquiah, Settat, Beni, Zagora, Berrechid, Oued Zem with IV in El Jadida, Khouribga, Azemmour, Kasba among other communities. It was also reported felt with light intensity II-III in Algeria, Spain, Portugal. Earthquakes in Morocco or Spain at this magnitude level are rare. The historical record shows no events of M>=6.8 within about 500 km of today's epicenter. The last significant earthquake in the area was an M 5.6 to the east of today's epicenter on October 23 and again on October 30, 1992.  An M 6.0 hit near today's epicenter in Morocco on February 29, 1960 - the only event in the historical record which goes back 150 year of M>=6 in Morocco.   NEIC reported the M 4.9 aftershocks was felt with maximum intensity VI in Morocco at Guelmim, Tiznit, Taroudannt, Quarzazate, V in Marracech, Agadir, Essaouira, Ben Guerir, and Khouriba among other communities.

 

The earthquake in Morocco followed an M 6.6 in the Kermadec Islands. These two epicenters are nearly antipodal and the quake in Morocco may have been triggered by antipodal stresses associated with the M 6.4 in the Kermadec Islands. It is also nearly antipodal to the M 7.7 in the Loyalty Islands earlier in the year. It is also likely the area was set up by the full moon of August 31, 2023 which reached fullness when it was near this longitude (note "Western Europe" and presumably northwestern Africa in the tidal forecast) as noted in previous issues of this summary:

 

"The full moon arrived at 1:35 UT on August 31, 2023. Longitudes which were at local solar midnight at this time are near 25 West and at local solar noon at 155 East. These zones include the central Atlantic and Iceland and western Europe in the west and the Kuril Islands, Japan and portions of eastern Indonesia and the Vanuatu Islands in the east. These areas are the most likely to see tidal triggering in the next week. Such events often occur near local solar midnight and noon. A major earthquake is considered likely with this full moon in the next week." (September 1--5, 2023)

 

Forecast 156187 had expected enhanced seismicity in the region of Morocco or  Spain to the north of today's epicenter was likely around September 5.

 

O:  8SEP2023 22:30:39  30.7N    9.4W mb=4.8  EMSC   MOROCCO                      

O:  8SEP2023 22:11:00  31.1N    8.5W Mw=6.8  EMSC   MOROCCO                      

P:  5SEP2023 156187    37.0N   10.0W 3.5-5.1 BCAAA  Morocco/Spain              

 

The M 6.6 in the Kermadec Islands, New Zealand today was widely felt in North Island, New Zealand - unlike most strong earthquakes in the Kermadec Islands. NEIC reported maximum intensity for the M 6.6 at IV in Gisborne at Te Karaka and II-III in the Bay of Plenty at Opotiki, Whakatane, in North Shore, Auckland, Napier, Hawke's Bay, in Manawatu-Wanganui at Palmerston North and Shannon, and more than 1000 km away in Wellington at Porirua, Lower Hutt and Wellington. This is the strongest earthquake in the Kermadec Islands within about 200 km of this epicenter since an M 6.6 on August 14, 2022 and an M 7.4 on June 18, 2020. At the time of the August 14, 2022 event this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.4-6.6 in the Kermadec Islands, New Zealand. It may have been felt lightly as far as North Island, New Zealand. This is the second strongest earthquake in the world in the past month following an M 7.0 in Luzon, Philippines on July 27. An M 6.6-6.8 also occurred in the Easter Island region on July 12, 2022 and an M 7.2 hit southern Peru on May 26, 2022, the last such events in the past three months. Today's event of M 6.6 is the strongest earthquake within about 200 km of this epicenter in the southern Kermadec Islands since an M 7.4 on June 18, 2020 and an M 6.9 on September 10, 2018 and an M 6.8 on December 9, 2008." (August 14, 2022)

 

Like that event today's earthquake also ended a long seismic quiet period. Forecasts 156350 and 156355 had expected this activity within about 100 km  in the Kermadec Islands was likely around September 8.

 

O:  9SEP2023 02:38:47  32.7S  177.7W mb=4.9  EMSC   SOUTH OF KERMADEC ISLANDS    

O:  8SEP2023 09:09:48  33.0S  178.6W Mw=6.6  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  8SEP2023 156350    33.0S  177.0W 4.0-5.6 AAAAA  No. Kermadec Islands       

P:  8SEP2023 156355    32.0S  178.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

 

An M 5.5 earthquake occurred off the east coast of Honshu, Japan today. NEIC reported it was felt with intensity II-III in  Japan in Miyagi and Aomori Prefectures, Japan. Enhanced seismicity in Honshu and off eastern Honshu, Japan had been expected at this time in this summary due to the passage of Tropical Storm Kirogi through the area at this time. This was emphasized in the September 5, issue of this summary as:

 

"NEIC reported this earthquake of M 4.9 near Tokyo, Japan  was felt with intensity II-III in the area(s) of Honshu, Japan in Chiba, Ibaraki, Tokyo, Saitama, Kanagawa Prefectures. This follows smaller events yesterday which was reported in this summary in the previous issue as:

 

"... An interesting earthquake of M 4.1 hit off the east coast of Honshu, Japan.

This event occurred near local solar noon and may have been promoted  by geomagnetic and tidal stresses which maximize near this hour. Tropical Storm Kirogi passed over this epicenter at the time of the earthquake. Moderately enhanced seismicity in this region of Japan had been expected in this summary in the previous issue as:

 

"Tropical Storm Kirogi is near Tokyo at this time as reported in this and previous issues of this summary, but also does not appear strong enough to trigger a large earthquake in the region at this time. It is expected to veer off to the east and not to make landfall in Honshu, but may affect regional seismicity moderately. This summary noted this storm as:

 

"TS Kirogi (11W) continued today in the area of the of the Bonin and Izu Islands, Japan with winds up to 35 kts. It is expected to track to the west and north any may enhance seismicity the Bonin and Izu Islands of southern Japan as it passes through this area." (September 1-2, 2023)

 

Forecast 156197 had expected today's event within about 50 km was likely around September 3." (September 4, 2023)

 

The earthquake in Tokyo today had been expected within about 50 km to occur around September 8 in forecast 156197. It is the strongest event within about 100 km of Tokyo, Japan since an M 6.1 on May 26, 2023 and may be an aftershock of that event. Similar events within about 100 km of Tokyo in the past year with M>=4.9  occurred on May 10, 2023 (M 5.2); November 9, 2022 (M 5.0 and September 21. 2022 (M 5.0). Today's event occurred near local solar noon and may have been promoted by tidal stresses which maximize near this hour." (September 5, 2023)

 

The last earthquake of M>=5.5 in the area off eastern Honshu within about 150 km of today's epicenter occurred on May 1, 2021 with M 6.8 although a series of similar events have hit the region slightly more than 150 km  from today's epicenter in recent months - including an M 7.3 on March 16, 2022.

 

Forecast 156220 had expected today's event within this area was likely

around September 7. This epicenter is at 104 degrees from the M 5.5 in Honshu, Japan and may have been promoted by energy from that source.

 

O:  8SEP2023 09:28:50  38.9N  142.2E mb=5.5  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  7SEP2023 156220    38.0N  143.0E 4.0-5.5 AAAAA  So. of Honshu              

 

An M 5.8 and M 5.6 were also felt in the region of Jalisco, Mexico today. NEIC reported the M 5.8 was felt with damage and intensity VIII in Jalisco at Cihuatlan, and IV in Las Juntas, San Patricio and Autlan with lesser shaking in Colima, Puerto Vallarta, Ixtapa, Bucerias, Nayarit, Tecalitlan and Jocotepec among others. The foreshock of M 5.6 was felt with similar intensities in the same areas of Jalisco, Mexico. These events occurred near local solar noon and may have been promoted by tidal stresses which maximize near this hour. The last earthquake of M>=5.8 in Jalisco within about 200 km of this epicenter occurred on September 20, 2022 also with M 5.8 an on June 30, 2018 with M 5.9-6.0.  A major earthquake of M 7.6 hit the area on January 22, 2003 and on October 9, 1995 an M 8.0 occurred east of these epicenters.

 

Forecast 156127 had expected this activity in Jalisco was likely around September 9.

 

O: 08SEP2023 15:53:20  19.4N  105.0W Mw=5.6  EMSC   JALISCO, MEXICO

O:  8SEP2023 16:37:12  19.4N  105.0W Mw=5.8  EMSC   JALISCO, MEXICO              

P:  9SEP2023 156127    18.0N  106.0W 3.5-5.1 ABAAA  Coast of Jalisco, Mexico   

 

An M 5.8 south  of Jalisco, Mexico also occurred today on the Northern East Pacific Rise. It was not felt in this epicentral area. Both these events are near the strongest Hurricane current active reaching wind speed up to 140 kts yesterday - Hurricane Jova which was described in the previous issue of this summary as:

 

"Hurricane Jova continued today in the area southwest of the Gulf of California as a category 4 hurricane (major storm) with winds up to 105 kts. It is expected to track to the west and north but not to significantly affect regional seismicity as this time." (September 8, 2023)

 

Stresses associated with this storm may have helped promote the activity in Jalisco and the East Pacific Rise today. Today's event in the East Pacific Rise is the first of M>=5.8 in that region within about 200 km since an M 5.8 on September 21, 2020 and an M 6.1 on March 22, 2020.

 

Forecast 156113 had expected today's event within about 100 km was likely around September 6. Like the M 5.5 in Honshu, Japan this epicenter is near 103 degrees from the M 6.8 in Morocco.

 

O:  9SEP2023 03:09:51   4.7S  105.4W Mw=5.8  EMSC   CENTRAL EAST PACIFIC RISE    

P:  6SEP2023 156113     5.0S  105.0W 4.0-5.7 BAAAA  No. East Pacific Rise      

 

The earthquake of M 5.6 in the Bali Sea, Indonesia today is probably an aftershock of the M 7.1 that rocked that region of August 28. At the time this summary noted in this regard:

 

 

"The last earthquake in the Bali Sea within about 250 km of today's events with M>=7.0 occurred more than 35 years years ago. Only three earthquakes in the area of equal of larger magnitude have been historically recorded - an M 7.3 on August 6, 1984; an M 7.2 on August 11, 1937 and an M 7.5 on December 29, 1820.  The only major events immediately following these included an M 7.5 in the Manila, Philippines area on August 20, 1937  and an M 5.5 on August 6, 1984 in the Molucca Sea south of the Philippines. Similar regional seismicity may be seen in the next several days." (August 28, 2023)

 

 

NEIC reported this earthquake of M 5.6 in the Bali Sea was felt with intensity II-III in the area(s) of Bali with IV in Denpasar, Ubud an Kuta and II in ?Yogyakarta, and Mataram, Indonesia. Forecasts 156117 had expected activity near Bali around September 6 would likely be enhanced.

 

O:  9SEP2023 00:06:15   6.8S  116.5E Mw=5.6  EMSC   BALI SEA                      

P:  6SEP2023 156117     6.0S  113.0E 4.0-5.7 BACAA  So. of Bali                

P:  9SEP2023 156122     9.0S  118.0E 4.0-5.4 ACBAA  Sumbawa Island area        

 

 

The largest earthquake in the U.S. or Canada today was an M 5.0 in northern California. NEIC reported it was felt with intensity V in Northern California near Cassel, Burney, Fall River Mills, McArthur, IV in Montgomery Creek, Old Station, Whitmore, Oak Run, McCloud, and with lesser intensity in Southern California and Oregon. An aftershock of M 4.3 was reported with intensity V in McArthur, IV in Redding; III in Milford and I in Santa Rosa, California. This activity occurred near local solar noon and may have been promoted by tidal stresses which maximize near this hour. The last earthquake in Northern California of M>=5 within about 100 km of today's epicenter occurred more than 35 years ago. An M 5.5 and 5.2 occurred about 100 km southeast of today's epicenter on May 11 and 12, 2023. Other regional seismicity at about 100 km from today's epicenter occurred with M 5.7 about 100 km to the southeast on May 24, 2013 and as an M 5.4 on November 26, 1998.  Forecast 156256 had expected today's activity within this area around September 8.

 

O: 08SEP2023 17:24:39  41.0N  121.5W Mw=4.9  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 17:24:39  41.0N  121.5W Mw=5.0  ANSS   NORTHERN CALIFORNIA

O: 08SEP2023 17:30:30  41.0N  121.6W MD=2.1  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 17:36:13  41.0N  121.5W MD=2.3  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 17:36:58  41.0N  121.6W MD=2.3  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 17:45:38  41.0N  121.6W MD=2.4  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 17:58:17  41.0N  121.6W MD=2.1  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 18:10:08  41.0N  121.6W MD=2.4  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 18:11:55  41.0N  121.6W MD=2.3  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 18:58:48  41.0N  121.6W MD=2.1  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 20:47:15  41.0N  121.6W MD=2.1  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 22:17:13  41.0N  121.6W MD=2.8  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 22:51:47  41.0N  121.6W MD=2.7  EMSC   NORTHERN CALIFORNIA

O: 09SEP2023 01:57:41  41.0N  121.6W MD=2.2  EMSC   NORTHERN CALIFORNIA

O:  8SEP2023 17:13:18  39.5N  122.0W MD=2.9  EMSC   NORTHERN CALIFORNIA          

O:  8SEP2023 18:50:58  40.9N  121.6W MD=2.4  EMSC   NORTHERN CALIFORNIA          

P:  8SEP2023 156256    40.4N  122.2W 2.5-4.4 AAAAA  Northern California        

 

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 6.9 in the area of Morocco September 8, 2023, where promoted seismicity is considered likely.

 

Today's projected seismicity map follows for the coming week.

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O:  8SEP2023 19:33:40  30.4N   94.9E mb=4.8  EMSC   EASTERN XIZANG               

P:  4SEP2023 156217    32.0N   95.0E 3.5-4.9 BBAAA  So. China                  

 

O:  8SEP2023 20:55:02  41.1N   83.8E mb=4.6  EMSC   SOUTHERN XINJIANG, CHINA     

P:  5SEP2023 156244    43.0N   82.0E 4.0-5.4 BBBAA  Kirgizstan/Xinjiang        

 

INDONESIA AND PHILIPPINES

 

O:  8SEP2023 22:50:01   4.3N  126.4E ML=4.1  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  3SEP2023 156098     4.0N  127.0E 4.0-5.4 BAAAA  Halmahera                  

 

O: 08SEP2023 17:26:48   6.0S  130.9E ML=4.2  EMSC   BANDA SEA

O:  9SEP2023 03:49:24   6.2S  130.2E mb=4.5  EMSC   BANDA SEA                    

P:  3SEP2023 156105     8.0S  129.0E 4.0-5.4 CBAAA  Banda Sea                  

 

O:  9SEP2023 00:06:15   6.8S  116.5E Mw=5.6  EMSC   BALI SEA                      

P:  6SEP2023 156117     6.0S  113.0E 4.0-5.7 BACAA  So. of Bali                

P:  9SEP2023 156122     9.0S  118.0E 4.0-5.4 ACBAA  Sumbawa Island area        

 

O:  9SEP2023 05:02:50   7.4S  128.5E mb=4.8  EMSC   KEPULAUAN BARAT DAYA, INDONESI

P:  5SEP2023 156105     7.0S  127.0E 4.0-5.4 BABAA  Banda Sea                  

 

O:  8SEP2023 10:54:48  19.1N  145.9E mb=5.2  EMSC   MAUG ISLANDS REG, N. MARIANA I

P:  7SEP2023 156142    18.0N  145.0E 4.0-5.6 ABAAA  No. Marianas               

 

 

CENTRAL AND SOUTH AMERICA

 

O:  8SEP2023 20:45:38   0.7S   77.3W mb=4.9  EMSC   ECUADOR                      

P:  7SEP2023 156108     1.0S   78.0W 4.0-5.6 AAAAA  Ecuador                    

 

O:  8SEP2023 15:13:03   8.0S   74.6W mb=4.4  EMSC   NORTHERN PERU                 

P:  5SEP2023 156114     8.0S   78.0W 4.0-5.7 BACAA  No. Peru                   

 

O: 09SEP2023 05:12:22   8.4N   82.9W mb=4.5  EMSC   PANAMA-COSTA RICA BORDER REGION

O:  9SEP2023 04:05:56   8.3N   82.9W ML=4.3  EMSC   PANAMA-COSTA RICA BORDER REGIO

P: 10SEP2023 156095     7.0N   78.0W 4.0-5.9 ABCAA  Colombia                   

 

O:  8SEP2023 10:35:37  14.8N   94.5W ML=4.2  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P:  8SEP2023 156126    15.0N   95.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O: 08SEP2023 09:40:09  14.9N   94.5W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 09SEP2023 00:54:15  15.5N   95.0W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O:  9SEP2023 00:18:55  15.8N   95.7W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO      

P:  8SEP2023 156126    15.0N   95.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O:  8SEP2023 19:27:51  16.6N   99.9W mb=4.5  EMSC   OFFSHORE GUERRERO, MEXICO    

P:  7SEP2023 156146    17.0N  100.0W 3.5-5.3 AAAAA  Oaxaca, Mexico             

 

NEIC reported this earthquake of M 4.5 in Guerrero, Mexico was felt with intensity II-III in the area(s) of Guerrero, Mexico in Acapulco.

 

O:  9SEP2023 06:01:04  17.9N   65.7W MD=3.3  EMSC   PUERTO RICO REGION           

O:  9SEP2023 05:59:43  17.9N   66.9W MD=3.0  EMSC   PUERTO RICO REGION           

P:  6SEP2023 156147    19.0N   67.0W 3.4-5.1 BBAAA  Puerto Rico                

 

O:  8SEP2023 09:43:44  18.2N   68.0W MD=3.4  EMSC   MONA PASSAGE, DOMINICAN REPUBL

P:  9SEP2023 156147    18.0N   69.0W 3.4-5.1 AAAAA  Puerto Rico                 

 

O:  8SEP2023 15:49:14  19.1N   65.8W MD=3.6  EMSC   PUERTO RICO REGION           

P:  6SEP2023 156133    18.0N   65.0W 3.0-5.1 ABAAA  Leeward Islands            

 

O:  9SEP2023 05:21:32  19.2N   71.9W ML=3.4  EMSC   DOMINICAN REPUBLIC REGION    

P:  9SEP2023 156147    19.0N   71.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O:  8SEP2023 16:37:12  19.4N  105.0W Mw=5.8  EMSC   JALISCO, MEXICO              

P:  9SEP2023 156127    18.0N  106.0W 3.5-5.1 ABAAA  Coast of Jalisco, Mexico   

 

O:  9SEP2023 01:59:14  19.8N   64.4W MD=3.8  EMSC   NORTH OF THE VIRGIN ISLANDS  

P:  6SEP2023 156133    18.0N   65.0W 3.0-5.1 BBAAA  Leeward Islands            

 

O:  8SEP2023 21:04:30  38.6S   69.0W ML=4.0  EMSC   NEUQUEN, ARGENTINA           

P:  9SEP2023 156346    38.0S   74.0W 4.0-5.9 AACAA  Central Chile              

 

O: 08SEP2023 15:53:20  19.4N  105.0W Mw=5.6  EMSC   JALISCO, MEXICO

O:  8SEP2023 16:37:12  19.4N  105.0W Mw=5.8  EMSC   JALISCO, MEXICO              

P:  9SEP2023 156127    18.0N  106.0W 3.5-5.1 ABAAA  Coast of Jalisco, Mexico   

 

AFRICA AND EUROPE

 

O:  8SEP2023 22:30:39  30.7N    9.4W mb=4.8  EMSC   MOROCCO                      

O:  8SEP2023 22:11:00  31.1N    8.5W Mw=6.8  EMSC   MOROCCO                      

P:  5SEP2023 156187    37.0N   10.0W 3.5-5.1 BCAAA  Morocco/Spain              

 

O:  8SEP2023 14:36:29  44.4N   13.3E ML=4.0  EMSC   ADRIATIC SEA                 

P:  8SEP2023 156233    45.0N   11.0E 3.0-5.1 AABAA  Austria                    

 

NEIC reported this earthquake of M 4.0 in Central Italy was felt with intensity II-III in the area(s) of Central Italy in Marken at Senigallia and Ancona.

 

O:  9SEP2023 03:24:38  63.9N   22.0W ML=3.3  EMSC   ICELAND REGION               

P:  4SEP2023 156303    63.0N   23.0W 3.0-4.4 BAAAA  Iceland area               

 

SOUTHWEST PACIFIC

 

O:  8SEP2023 16:34:50  19.1S  175.5W mb=5.2  EMSC   TONGA                        

P:  3SEP2023 156325    19.0S  176.0W 4.0-5.4 BAAAA  Tonga Islands              

 

O: 09SEP2023 00:45:43  18.9S  168.9E mb=5.0  EMSC   VANUATU

P:  6SEP2023 156328    18.0S  168.0E 4.0-5.6 AAAAA  Vanuatu Islands            

 

NEIC reported this earthquake of M 5.0 in Vanuatu was felt with intensity II-III in the area(s) of Vanuatu at Vila Shefa.

 

O:  8SEP2023 14:26:10  26.0S  178.8E mb=4.9  EMSC   SOUTH OF FIJI ISLANDS        

P:  2SEP2023 156356    32.0S  180.0E 4.0-5.5 CCAAA  So. Kermadec Islands       

 

OCEAN RIDGES

 

O:  9SEP2023 03:09:51   4.7S  105.4W Mw=5.8  EMSC   CENTRAL EAST PACIFIC RISE    

P:  6SEP2023 156113     5.0S  105.0W 4.0-5.7 BAAAA  No. East Pacific Rise      

 

O:  8SEP2023 20:32:00  32.2S   13.8W mb=5.0  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

 

O:  8SEP2023 12:41:13  13.2N   50.1E mb=4.4  EMSC   GULF OF ADEN                 

P:  3SEP2023 156130    15.0N   54.0E 3.5-4.9 BBCAA  Gulf of Aden               

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  8SEP2023 23:58:15  32.0S  178.8E Mw=3.6  EMSC   KERMADEC ISLANDS REGION      

P:  2SEP2023 156356    32.0S  180.0E 4.0-5.5 CAAAA  So. Kermadec Islands       

 

O:  9SEP2023 02:38:47  32.7S  177.7W mb=4.9  EMSC   SOUTH OF KERMADEC ISLANDS    

O:  8SEP2023 09:09:48  33.0S  178.6W Mw=6.6  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  8SEP2023 156350    33.0S  177.0W 4.0-5.6 AAAAA  No. Kermadec Islands       

P:  8SEP2023 156355    32.0S  178.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

 

JAPAN AND KURIL ISLANDS

 

O: 08SEP2023 22:10:30  25.1N  124.7E ML=4.6  EMSC   NORTHEAST OF TAIWAN

O:  8SEP2023 22:09:49  25.1N  124.8E mb=4.8  EMSC   NORTHEAST OF TAIWAN          

P:  5SEP2023 156164    24.0N  125.0E 4.0-5.6 BBAAA  Taiwan                     

 

O:  9SEP2023 02:41:30  33.6N  132.0E ML=4.1  EMSC   SHIKOKU, JAPAN               

P:  9SEP2023 156185    34.0N  132.0E 3.5-5.0 AAAAA  Kyushu, Japan area         

 

O:  8SEP2023 09:28:50  38.9N  142.2E mb=5.5  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  7SEP2023 156220    38.0N  143.0E 4.0-5.5 AAAAA  So. of Honshu              

 

O: 08SEP2023 17:28:54  29.2N  129.7E Mw=5.1  EMSC   RYUKYU ISLANDS, JAPAN

O: 08SEP2023 18:08:17  29.2N  129.5E Mw=5.2  EMSC   RYUKYU ISLANDS, JAPAN

O: 08SEP2023 18:23:12  29.2N  129.4E mb=4.4  EMSC   RYUKYU ISLANDS, JAPAN

O: 08SEP2023 22:47:02  29.3N  129.3E mb=4.9  EMSC   RYUKYU ISLANDS, JAPAN

O: 09SEP2023 02:40:15  29.3N  129.6E mb=4.5  EMSC   RYUKYU ISLANDS, JAPAN

O: 09SEP2023 03:03:39  29.4N  129.3E mb=4.6  EMSC   RYUKYU ISLANDS, JAPAN

O:  8SEP2023 15:24:01  29.2N  129.5E mb=4.6  EMSC   RYUKYU ISLANDS, JAPAN        

P:  7SEP2023 156156    29.0N  131.0E 4.0-5.6 AAAAA  Kyushu Japan               

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 08SEP2023 20:01:16  31.5N  115.6W ML=3.1  EMSC   BAJA CALIFORNIA, MEXICO

O: 08SEP2023 20:02:38  31.5N  115.7W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO

O:  8SEP2023 09:53:46  31.0N  115.1W ML=3.5  EMSC   BAJA CALIFORNIA, MEXICO      

P:  7SEP2023 156204    30.9N  116.2W 2.5-4.4 AAAAA  So. California             

 

O:  8SEP2023 23:40:27  34.0N  117.0W ML=3.0  EMSC   SOUTHERN CALIFORNIA          

P:  8SEP2023 156211    34.2N  117.8W 2.5-4.6 AAAAA  So. California             

 

NEIC reported this earthquake of M 3.1 in Southern California was felt with intensity II-III in the area(s) of Southern California in Yucaipa, Calimesa, Beaumont, Forest Falls, Banning, Angelus, Redlands among others.

 

O:  8SEP2023 11:14:35  34.5N  119.0W ML=2.2  EMSC   SOUTHERN CALIFORNIA          

P:  9SEP2023 156209    33.8N  119.7W 2.5-4.6 AAAAA  So. California             

 

O:  8SEP2023 20:02:31  37.9N  118.6W MD=2.2  EMSC   CENTRAL CALIFORNIA           

P:  9SEP2023 156170    37.5N  118.6W 2.5-4.6 AAAAA  California/Nevada area     

 

O:  8SEP2023 17:59:44  38.8N  122.8W MD=2.0  EMSC   NORTHERN CALIFORNIA          

P:  6SEP2023 156176    38.7N  122.8W 2.5-4.7 AAAAA  Central California         

 

O:  8SEP2023 09:26:53  39.1N  123.5W MD=2.1  EMSC   NORTHERN CALIFORNIA          

P:  9SEP2023 156177    39.7N  123.7W 2.5-4.6 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.7 in Northern California  was felt with intensity II-III in the area(s) of  Northern California in Palo Cedro, Redding and Likely.

 

O:  8SEP2023 11:55:46  39.2N  120.1W MD=2.1  EMSC   NORTHERN CALIFORNIA          

P:  9SEP2023 156173    39.3N  120.0W 2.5-4.7 AAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 2.8 in Northern California was felt with intensity II-III in the area(s) of Northern California in Burney (IV), Redding and Palo Cedro.

 

O: 08SEP2023 17:24:39  41.0N  121.5W Mw=4.9  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 17:24:39  41.0N  121.5W Mw=5.0  ANSS   NORTHERN CALIFORNIA

O: 08SEP2023 17:30:30  41.0N  121.6W MD=2.1  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 17:36:13  41.0N  121.5W MD=2.3  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 17:36:58  41.0N  121.6W MD=2.3  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 17:45:38  41.0N  121.6W MD=2.4  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 17:58:17  41.0N  121.6W MD=2.1  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 18:10:08  41.0N  121.6W MD=2.4  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 18:11:55  41.0N  121.6W MD=2.3  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 18:58:48  41.0N  121.6W MD=2.1  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 20:47:15  41.0N  121.6W MD=2.1  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 22:17:13  41.0N  121.6W MD=2.8  EMSC   NORTHERN CALIFORNIA

O: 08SEP2023 22:51:47  41.0N  121.6W MD=2.7  EMSC   NORTHERN CALIFORNIA

O: 09SEP2023 01:57:41  41.0N  121.6W MD=2.2  EMSC   NORTHERN CALIFORNIA

O:  8SEP2023 17:13:18  39.5N  122.0W MD=2.9  EMSC   NORTHERN CALIFORNIA          

O:  8SEP2023 18:50:58  40.9N  121.6W MD=2.4  EMSC   NORTHERN CALIFORNIA           

P:  8SEP2023 156256    40.4N  122.2W 2.5-4.4 AAAAA  Northern California        

 

ALASKA

 

O:  8SEP2023 22:15:05  52.9N  167.9W ML=3.8  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  9SEP2023 156284    51.9N  169.2W 3.5-4.9 AAAAA  Fox Islands, Aleutians     

 

O:  8SEP2023 23:35:04  58.3N  155.1W ML=3.2  EMSC   ALASKA PENINSULA             

P:  5SEP2023 156276    54.7N  156.9W 3.5-5.1 BCAAA  Alaska Peninsula           

 

O:  8SEP2023 16:27:20  63.1N  150.4W mb=4.3  EMSC   CENTRAL ALASKA               

P:  8SEP2023 156302    62.7N  150.6W 3.2-5.6 AAAAA  Central Alaska             

 

NEIC reported this earthquake of M 4.3 in Central Alaska was felt with intensity II-III in the area(s) of Central Alaska in Matanuska-Susitna Borough, Talkeetna (IV), Healy, Willow, Wasilla, Chugiak, Palmer.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  8SEP2023 16:43:15  47.1N  121.0W ML=2.1  EMSC   WASHINGTON                   

P:  8SEP2023 156272    46.9N  122.0W 2.0-4.2 AAAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O:  8SEP2023 09:59:07  37.0N  105.0W ML=2.3  EMSC   COLORADO                     

P:  8SEP2023 156179    36.9N  105.1W 2.0-4.0 AAAAA  Colorado area              

 

O: 08SEP2023 13:40:56  31.7N  104.4W ML=2.1  EMSC   WESTERN TEXAS

O:  8SEP2023 13:20:13  31.7N  104.4W ML=2.0  EMSC   WESTERN TEXAS                

P:  8SEP2023 156201    32.6N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

O:  8SEP2023 08:02:44  42.7N  111.0W ML=2.4  EMSC   WYOMING                      

P:  6SEP2023 156273    43.0N  111.5W 2.0-4.1 AAAAA  Yellowstone/Wyoming        

 

EASTERN U.S./CANADA

 

O:  8SEP2023 18:10:10  34.9N   97.6W ML=2.1  EMSC   OKLAHOMA                     

P:  4SEP2023 156222    35.0N   97.0W 2.0-4.3 BAAAA  Southern Plains            

 

O:  8SEP2023 07:31:35  35.5N   92.4W MD=2.0  EMSC   ARKANSAS                     

P:  5SEP2023 156189    35.0N   89.0W 2.0-4.3 BABAA  New Madrid area            

 

O:  8SEP2023 07:56:26  36.9N   83.0W MD=2.2  EMSC   EASTERN KENTUCKY             

P:  5SEP2023 156184    37.0N   83.0W 2.0-4.1 BAAAA  Kentucky/Tennessee/NC      

 

O:  8SEP2023 17:11:08  47.7N   69.3W MB=1.9  ECAN of Saint-Honor├⌐-de-T├⌐miscouata

P:  9SEP2023 156251    47.3N   70.5W 2.0-4.1 AAAAA  New England                

 

HAWAII

 

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

 

 

QUIET PERIOD MAY BE ENDING

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 7, 2023

 

It was a very quiet day in global seismicity. Recent earthquakes such as the M 6.2 in Coquimbo yesterday, however suggest there is plenty of seismic energy available to be released under the right circumstances. This summary expects this quiet period to end in the next day or two as reported in this and previous summaries:

 

"The geomagnetic field saw quiet  conditions today. The AP level was 6.  High latitudes  saw quiet conditions with AP 3. Middle latitudes were at disturbed conditions with AP 11. This appears to conclude the strongest geomagnetic storm since August 1-2, 2023 and will probably decrease global seismicity through about September 5-6 when strong earthquakes may be further introduced with the return of strong ionospheric ring currents." (September 5-7, 2023)

 

Some of this is likely to occur in areas near the International Date Line (IDL) and antipodally at the Greenwich Meridian (0 degree longitude) as noted in  previous issues of this summary in regard to the full moon of August 31:

 

"The full moon arrived at 1:35 UT on August 31, 2023. Longitudes which were at local solar midnight at this time are near 25 West and at local solar noon at 155 East. These zones include the central Atlantic and Iceland and western Europe in the west and the Kuril Islands, Japan and portions of eastern Indonesia and the Vanuatu Islands in the east. These areas are the most likely to see tidal triggering in the next week. Such events often occur near local solar midnight and noon. A major earthquake is considered likely with this full moon in the next week." (August 28-September 5, 2023)

 

The strongest earthquakes in the world today were an M 5.1 in the Talaud Islands,  Indonesia, an M 4.9 in the Kermadec Islands, New Zealand and an M 5.0 in Kamchatka. None of these events were reported felt and they were not unusual for their regions.

 

O:  7SEP2023 19:20:13   4.4N  127.8E Mw=5.1  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  5SEP2023 156098     4.0N  129.0E 4.0-5.4 AAAAA  Halmahera                  

 

O: 07SEP2023 23:07:48  56.2N  163.8E mb=4.8  EMSC   NEAR EAST COAST OF KAMCHATKA

O:  7SEP2023 23:02:17  56.2N  163.9E mb=5.0  EMSC   NEAR EAST COAST OF KAMCHATKA 

P:  5SEP2023 156287    55.0N  166.0E 4.0-5.8 ABBAA  Komandorsky Isl            

 

O:  7SEP2023 23:27:03  31.4S  177.7W mb=4.9  EMSC   KERMADEC ISLANDS REGION      

P:  8SEP2023 156355    32.0S  178.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 3.3 off the coast of Oregon. This is the strongest earthquake within about 100 km of this epicenter since an M 4.0 on August 1, 2023.  NEIC reported this earthquake of M 3.3 off the coast of Oregon  was felt with intensity II-III in the area(s) of Oregon in Port Orford and Rockaway Beach. Forecast 1565258 had expected this event within about 25 km was likely around September 7.

 

O:  8SEP2023 00:36:35  43.1N  126.2W ML=3.3  EMSC   OFF COAST OF OREGON          

P:  7SEP2023 156258    43.1N  126.5W 3.0-4.4 AAAAA  Off Coast of Oregon        

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of Bali August 28, 2023, where promoted seismicity is considered likely.

 

Today's projected seismicity map follows for the coming week.

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O:  7SEP2023 18:04:02  36.5N   71.7E mb=4.3  EMSC   HINDU KUSH REGION, AFGHANISTAN

P:  8SEP2023 156182    36.0N   71.0E 3.8-5.2 AAAAA  Hindu Kush/Pakistan        

 

O:  7SEP2023 19:26:26  43.3N   84.9E mb=4.5  EMSC   NORTHERN XINJIANG, CHINA     

P:  5SEP2023 156244    43.0N   82.0E 4.0-5.4 AABAA  Kirgizstan/Xinjiang        

 

O:  7SEP2023 16:27:30  55.0N  166.0E mb=4.5  EMSC   KOMANDORSKIYE OSTROVA REGION 

P:  5SEP2023 156287    55.0N  166.0E 4.0-5.8 AAAAA  Komandorsky Isl            

 

O: 07SEP2023 23:07:48  56.2N  163.8E mb=4.8  EMSC   NEAR EAST COAST OF KAMCHATKA

O:  7SEP2023 23:02:17  56.2N  163.9E mb=5.0  EMSC   NEAR EAST COAST OF KAMCHATKA 

P:  5SEP2023 156287    55.0N  166.0E 4.0-5.8 ABBAA  Komandorsky Isl            

 

INDONESIA AND PHILIPPINES

 

O:  7SEP2023 15:18:48   1.9N  123.0E mb=4.3  EMSC   MINAHASA, SULAWESI, INDONESIA

P:  6SEP2023 156091     0.0N  122.0E 4.0-5.4 ABAAA  Celebes Sea                

 

O:  7SEP2023 12:53:30   2.3S  140.1E ML=4.0  EMSC   NEAR N COAST OF PAPUA, INDONES

P:  7SEP2023 156115     3.0S  140.0E 4.0-5.4 AAAAA  Papua New Guinea           

 

O:  7SEP2023 19:20:13   4.4N  127.8E Mw=5.1  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  5SEP2023 156098     4.0N  129.0E 4.0-5.4 AAAAA  Halmahera                  

 

O:  7SEP2023 13:57:38   6.6S  103.7E ML=4.2  EMSC   SOUTHWEST OF SUMATRA, INDONESI

P:  4SEP2023 156119     7.0S  104.0E 4.0-5.6 BAAAA  So. of Sumatera            

P:  6SEP2023 156119     6.0S  102.0E 4.0-5.6 AABAA  So. of Sumatera            

 

O:  7SEP2023 16:32:50  12.6N  143.6E mb=4.5  EMSC   GUAM REGION                  

P:  7SEP2023 156148    12.0N  141.0E 4.0-5.4 AABAA  So. Marianas/Guam          

 

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

 

CENTRAL AND SOUTH AMERICA

 

O:  7SEP2023 08:53:42   6.9N   73.1W mb=4.3  EMSC   NORTHERN COLOMBIA            

P:  4SEP2023 156095     7.0N   73.0W 4.0-5.5 BAAAA  Colombia                   

 

O: 08SEP2023 06:34:30  16.1N   96.1W ML=4.3  EMSC   OAXACA, MEXICO

O:  7SEP2023 20:08:08  15.6N   95.1W ML=4.2  EMSC   OFFSHORE OAXACA, MEXICO      

P:  8SEP2023 156126    15.0N   95.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O:  7SEP2023 18:16:31  16.9N   93.7W ML=4.0  EMSC   CHIAPAS, MEXICO              

P:  6SEP2023 156126    16.0N   94.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O:  8SEP2023 05:21:47  18.8S   68.0W mb=4.2  EMSC   ORURO, BOLIVIA               

P:  5SEP2023 156321    19.0S   69.0W 4.0-5.7 BAAAA  So. Peru/Bolivia           

 

O:  8SEP2023 00:12:49  18.9N   67.7W MD=3.4  EMSC   PUERTO RICO REGION           

P:  6SEP2023 156147    19.0N   67.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O:  8SEP2023 03:49:17  19.2N   64.5W MD=3.4  EMSC   VIRGIN ISLANDS REGION        

P:  6SEP2023 156133    18.0N   65.0W 3.0-5.1 ABAAA  Leeward Islands            

 

O:  7SEP2023 07:52:29  24.1S   69.5W mb=4.3  EMSC   ANTOFAGASTA, CHILE           

P:  1SEP2023 156332    23.0S   69.0W 4.0-5.8 CBAAA  Coast No. Chile             

 

O:  7SEP2023 10:45:16  30.2S   71.4W ML=4.5  EMSC   COQUIMBO, CHILE              

P:  6SEP2023 156348    30.0S   72.0W 4.0-5.6 AAAAA  Coast Central Chile        

 

 

AFRICA AND EUROPE

 

NEIC reported an earthquake of M 4.2 in the Dodecanese Islands, Greece was felt with intensity II-III in the area(s) of the Dodecanese Islands, Greece at Glossa Magnisia.

 

O:  8SEP2023 02:03:02  41.8N   32.6E ML=4.2  EMSC   CENTRAL TURKEY               

P:  2SEP2023 156255    41.0N   33.0E 3.5-4.9 CAAAA  No. Turkey/Black Sea       

 

O:  7SEP2023 19:49:46  62.4N    4.9E mb=4.0  EMSC   NORWEGIAN SEA                

 

O:  7SEP2023 07:58:31  75.1N    8.7E Mw=3.7  EMSC   GREENLAND SEA                

 

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

 

SOUTHWEST PACIFIC

 

O:  8SEP2023 06:14:53  21.1S  178.7W mb=4.3  EMSC   FIJI REGION                  

P:  3SEP2023 156340    21.0S  179.0W 4.0-5.4 BAAAA  Tonga Islands              

 

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

 

OCEAN RIDGES

 

O:  7SEP2023 23:22:09   2.3N  102.0W mb=4.6  EMSC   GALAPAGOS TRIPLE JUNCTION REGI

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  7SEP2023 23:27:03  31.4S  177.7W mb=4.9  EMSC   KERMADEC ISLANDS REGION      

P:  8SEP2023 156355    32.0S  178.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

 

JAPAN AND KURIL ISLANDS

 

O: 07SEP2023 19:55:30  29.3N  129.3E ML=4.2  EMSC   RYUKYU ISLANDS, JAPAN

O: 07SEP2023 23:07:30  29.3N  129.3E ML=4.0  EMSC   RYUKYU ISLANDS, JAPAN

O: 08SEP2023 02:15:36  29.4N  129.3E mb=4.5  EMSC   RYUKYU ISLANDS, JAPAN

O:  7SEP2023 17:50:28  29.2N  129.7E mb=4.5  EMSC   RYUKYU ISLANDS, JAPAN        

P:  7SEP2023 156156    29.0N  131.0E 4.0-5.6 AAAAA  Kyushu Japan               

 

O:  7SEP2023 15:37:30  25.0N  125.6E ML=4.1  EMSC   SOUTHWESTERN RYUKYU ISL., JAPA

P:  5SEP2023 156164    24.0N  125.0E 4.0-5.6 AAAAA  Taiwan                     

 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 07SEP2023 07:48:19  31.4N  115.3W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO

O:  7SEP2023 07:07:01  31.1N  115.4W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO      

P:  7SEP2023 156204    30.9N  116.2W 2.5-4.4 AAAAA  So. California             

 

O:  7SEP2023 18:28:52  31.9N  115.8W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO      

P:  7SEP2023 156204    30.9N  116.2W 2.5-4.4 AAAAA  So. California             

 

O:  8SEP2023 05:59:22  33.2N  116.8W ML=2.9  EMSC   SOUTHERN CALIFORNIA          

P:  6SEP2023 156205    32.4N  115.8W 2.5-4.5 AAAAA  So. California             

 

NEIC reported this earthquake of M 3.1 in Southern California was felt with intensity II-III in the area(s) of Southern California in Pala (IV), Santa Ysabel, Warner Springs, Valley Center, Escondido, Ramona, Poway among others.

 

O: 07SEP2023 14:39:35  38.5N  119.5W MD=2.0  EMSC   CENTRAL CALIFORNIA

O:  7SEP2023 14:25:05  38.5N  119.5W MD=2.7  EMSC   CENTRAL CALIFORNIA           

P:  5SEP2023 156172    39.1N  119.6W 2.5-4.6 AAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 2.9 in Central California was felt with intensity II-III in the area(s) of Central California in Kings Beach, Salinas and McCloud.

 

O: 07SEP2023 08:40:02  38.8N  122.8W MD=2.3  EMSC   NORTHERN CALIFORNIA

O:  7SEP2023 12:01:45  38.6N  122.8W MD=2.0  EMSC   NORTHERN CALIFORNIA          

P:  6SEP2023 156176    38.7N  122.8W 2.5-4.7 AAAAA  Central California         

 

O:  7SEP2023 23:31:35  39.5N  121.8W ML=2.7  EMSC   NORTHERN CALIFORNIA          

O:  7SEP2023 23:30:10  39.5N  122.5W MD=2.9  EMSC   NORTHERN CALIFORNIA          

P:  8SEP2023 156256    40.4N  122.2W 2.5-4.4 AAAAA  Northern California        

 

O:  7SEP2023 17:42:47  40.0N  123.8W ML=3.2  EMSC   NORTHERN CALIFORNIA          

O: 07SEP2023 11:37:06  39.9N  123.3W MD=2.0  EMSC   NORTHERN CALIFORNIA

P:  9SEP2023 156177    39.7N  123.7W 2.5-4.6 AAAAA  Central California         

 

NEIC reported this earthquake of M 3.2 in Northern California was felt with intensity II-III in the area(s) of Northern California in Piercy, Garberville.

 

O:  7SEP2023 22:44:43  40.2N  121.2W MD=2.1  EMSC   NORTHERN CALIFORNIA          

P:  7SEP2023 156256    40.0N  120.9W 2.5-4.5 AAAAA  Northern California        

 

O:  7SEP2023 18:12:38  40.9N  127.2W ML=2.9  EMSC   OFF COAST OF NORTHERN CALIFORN

P:  4SEP2023 156258    42.5N  126.8W 3.0-4.4 BBAAA  Off Coast of Oregon        

P: 30AUG2023 155992    40.9N  126.3W 2.5-4.6 CAAAA  Off Coast of No. Calif     

 

 

ALASKA

 

O:  7SEP2023 09:29:58  59.8N  152.6W ML=3.3  EMSC   SOUTHERN ALASKA              

P:  6SEP2023 156301    60.2N  153.2W 3.2-5.2 AAAAA  Central Alaska             

P:  7SEP2023 156300    60.7N  151.8W 3.2-5.4 AAAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.3 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska in Anchor Point.

 

O:  7SEP2023 02:10:48  58.6N  138.7W MB=3.1  ECAN of Yakutat, AK                 

P:  8SEP2023 156293    57.9N  139.0W 3.0-4.6 AAAAA  Southeast Alaska           

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  8SEP2023 00:36:35  43.1N  126.2W ML=3.3  EMSC   OFF COAST OF OREGON          

P:  7SEP2023 156258    43.1N  126.5W 3.0-4.4 AAAAA  Off Coast of Oregon        

 

ROCKY MOUNTAINS REGION

 

O: 08SEP2023 02:31:58  31.6N  104.0W ML=2.4  EMSC   WESTERN TEXAS

O: 08SEP2023 00:37:36  31.7N  104.2W ML=2.1  EMSC   WESTERN TEXAS

O: 08SEP2023 02:30:02  31.7N  104.3W ML=2.2  EMSC   WESTERN TEXAS

O:  8SEP2023 00:30:27  31.6N  104.4W ML=2.3  EMSC   WESTERN TEXAS                

P:  8SEP2023 156201    32.6N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

O: 08SEP2023 06:46:25  32.4N  102.1W ML=2.4  EMSC   WESTERN TEXAS

O:  8SEP2023 01:35:33  31.9N  102.0W ML=3.0  EMSC   WESTERN TEXAS                

P:  5SEP2023 156201    32.6N  101.6W 2.0-4.1 BAAAA  SW U.S.A                   

 

NEIC reported this earthquake of M 3.0 in Western Texas was felt with intensity II-III in the area(s) of Western Texas in Midland and Odessa.

 

O:  7SEP2023 15:49:30  43.2N  111.4W ML=2.2  EMSC   SOUTHERN IDAHO               

P:  6SEP2023 156273    43.0N  111.5W 2.0-4.1 AAAAA  Yellowstone/Wyoming        

 

O:  7SEP2023 15:03:12  44.5N  114.1W ML=2.2  EMSC   SOUTHERN IDAHO               

P:  5SEP2023 156247    44.5N  114.8W 2.0-3.9 AAAAA  Montana/Idaho               

 

EASTERN U.S./CANADA

 

O:  7SEP2023 15:22:35  36.5N   98.8W ML=2.1  EMSC   OKLAHOMA                     

P:  7SEP2023 156223    36.0N   98.0W 2.0-4.3 AAAAA  Southern Plains            

 

O:  7SEP2023 06:38:23  45.4N   66.3W MB=1.3  ECAN of Greenwich, NB               

P:  8SEP2023 156237    46.0N   66.0W 2.0-4.5 AAAAA  E. of Maine                

 

O:  7SEP2023 07:09:33  47.4N   70.5W MB=0.9  ECAN of Baie-Saint-Paul, QC         

O:  6SEP2023 22:34:40  47.7N   70.1W MB=0.9  ECAN of La Malbaie, QC              

P:  4SEP2023 156251    47.3N   70.5W 2.0-4.1 AAAAA  New England                

P:  9SEP2023 156251    47.3N   70.5W 2.0-4.1 AAAAA  New England                

 

HAWAII

 

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


 

 

 

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