MODERATE EARTHQUAKES SHAKE NORTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 30, 2023

 

The strongest earthquakes in the U.S. or Canada today occurred off the coast of northern California. NEIC reported the largest of these - of M 4.7 was felt with maximum intensity V in California at Loleta and IV in Ferndale, Fortuna, Rio Dell, Hydesville, Eureka, Petrolia and Samoa. An aftershock of M 4.2 was felt with intensity IV in Ferndale, Loleta and III in Rio Dell, Fortuna, Petrolia, Hydesville and Scotia among others. An M 3.7 aftershock was also felt with intensity II-III in northern California in Hydesville, Eureka and Whitethorn.

The last earthquake off the coast of Northern California with M>=4.7 was an M 5.6 on May 21, 2023. A strong M 6.4 hit the area on December 20, 2022. At the time this summary noted:

 

 

"Today's M 6.4 is the strongest within about 200 km of this epicenter in Northern California since an M 6.8 on March 10, 2014 and an M 6.5 on January 10, 2010 and an M 7.1 on June 15, 2005, the only such earthquakes in this area in at least 25 years." (December 20, 2022)

 

Forecast 156791 had expected today's event off Northern California was likely within about 25 km of today's epicenter around September 26. Today's activity was  timed near local solar noon and may have been promoted by tidal stresses with the full moon of September 29.

 

O: 30SEP2023 17:25:19  40.5N  124.5W md=2.1  ANSS   OFF COAST OF NORTHERN CALIFORNIA

O: 30SEP2023 15:26:26  40.6N  124.3W mw=4.7  ANSS   OFF COAST OF NORTHERN CALIFORNIA

O: 30SEP2023 17:25:19  40.5N  124.5W md=2.1  ANSS   OFF COAST OF NORTHERN CALIFORNIA         

O: 30SEP2023 17:16:47  40.5N  124.4W mw=4.2  ANSS   OFF COAST OF NORTHERN CALIFORNIA

O: 30SEP2023 17:16:47  40.5N  124.4W mw=4.2  ANSS   OFF COAST OF NORTHERN CALIFORNIA

O: 30SEP2023 19:58:21  40.5N  124.5W md=2.0  ANSS   OFF COAST OF NORTHERN CALIFORNIA

O: 30SEP2023 19:58:21  40.5N  124.5W md=2.0  ANSS   OFF COAST OF NORTHERN CALIFORNIA

P: 26SEP2023 156791    40.4N  124.2W 2.5-4.6 AAAAA  Off Coast of No. Calif     

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: 30SEP2023 07:17:36  51.3N  158.3E ML=4.1  KRS    KAMCHATKA                    

P: 22SEP2023 156816    52.0N  159.0E 4.0-5.9 CAAAA  Kamchatka                  

P: 26SEP2023 156813    52.0N  160.0E 4.0-5.5 BABAA  E. of Kamchatka            

 

O: 30SEP2023 08:57:46  54.7N  163.3E ML=4.2  KRS    KOMANDORSKY ISLANDS                             

P: 28SEP2023 156817    56.0N  166.0E 4.0-6.1 ABBAA  Komandorsky Isl            

 

O: 30SEP2023 08:30:17  36.8N   71.2E mb=4.2  ANSS   HINDU KUSH, AFGHANISTAN

P: 29SEP2023 156716    36.0N   70.0E 3.8-5.2 AAAAA  Hindu Kush/Pakistan        

 

O: 30SEP2023 21:30:09  42.1N   77.1E mb=4.1  ANSS   KYRGYZSTAN  

O: 30SEP2023 21:30:05  42.0N   77.1E ML=4.7  KRN    KYRGYZSTAN                   

P: 30SEP2023 156776    40.0N   75.0E 4.0-5.6 ABBAA  Kirgizstan/Xinjiang        

 

NEIC reported this earthquake of M 4.1 in Kyrgyzstan was felt with intensity II-III in the area(s) of Kyrgyzstan in Kyzyl-Tuu.

 

O: 30SEP2023 11:19:40  39.7N   74.8E ML=4.2  KRN    KYRGYZSTAN                             

P: 30SEP2023 156776    40.0N   75.0E 4.0-5.6 AAAAA  Kirgizstan/Xinjiang        

 

INDONESIA AND PHILIPPINES

 

O: 30SEP2023 16:16:45   2.9S  129.6E mb=4.4  ANSS   SERAM INDONESIA              

P: 29SEP2023 156644     3.0S  129.0E 4.0-5.4 AAAAA  Ceram area                 

 

O: 30SEP2023 23:30:35   4.4S  152.6E mb=4.8  ANSS   PAPUA NEW GUINEA             

P: 22SEP2023 156649     5.0S  153.0E 4.0-5.4 CAAAA  New Britain                

 

O: 30SEP2023 06:33:43   9.1S  105.4E mb=4.9  ANSS   SOUTH OF SUMATRA, INDONESIA  

P: 28SEP2023 156655     9.0S  106.0E 4.0-5.4 AAAAA  So. of Java                

 

NEIC reported an earthquake of M 5.3 in Java, Indonesia was felt with intensity II-III in the area(s) of Java, Indonesia in Sukabumi, Ciawi, Pamulang, Bekasi, Jakarta, Tangerang, Bandung, Cikeruh.

 

CENTRAL AND SOUTH AMERICA

 

O: 30SEP2023 17:53:24  32.2S   72.0W mw=4.2  ANSS   CENTRAL CHILE

P: 27SEP2023 156874    32.0S   71.0W 4.0-5.4 BAAAA  Central Chile              

 

O: 30SEP2023 17:44:06  33.7S   72.6W mw=4.3  ANSS   CENTRAL CHILE

P: 29SEP2023 156874    33.0S   70.0W 4.0-5.6 AABAA  Central Chile              

 

O: 30SEP2023 05:02:40  15.4N   94.7W ML=4.1  UNAM  CRUZ, OAX, MEXICO

O: 30SEP2023 11:47:13  15.9N   95.6W ML=4.0  UNAM  CRUZ, OAX, MEXICO

O: 30SEP2023 16:52:18  16.0N   95.2W ML=4.0  UNAM  CRUZ, OAX, MEXICO

O: 30SEP2023 20:36:00  16.9N   94.1W ML=4.2  UNAM  CINTALAPA, CHIS, MEXICO       

P: 25SEP2023 156667    17.0N   94.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

 

O: 01OCT2023 03:21:00  15.9N   98.0W ML=4.0  UNAM  NACIONAL, OAX, MEXICO         

P: 23SEP2023 156682    16.0N   98.0W 3.5-5.4 CAAAA  Oaxaca, Mexico             

P: 27SEP2023 156683    16.0N  100.0W 3.5-5.3 BABAA  Oaxaca, Mexico             

 

O: 30SEP2023 10:12:24  28.0N  112.2W ML=3.6  UNAM  ROSALIA, BCS, MEXICO          

P: 25SEP2023 156692    28.0N  112.0W 3.5-5.2 BAAAA  Gulf of California         

 

O: 01OCT2023 05:20:19  17.9N   66.3W md=3.2  ANSS   PUERTO RICO REGION 

O: 01OCT2023 05:43:09  17.9N   66.3W md=3.3  ANSS   PUERTO RICO REGION

O: 01OCT2023 02:22:42  17.9N   66.9W md=3.2  ANSS   PUERTO RICO REGION

O: 30SEP2023 18:40:51  18.1N   66.4W md=3.4  ANSS   PUERTO RICO REGION 

O: 30SEP2023 18:40:51  18.1N   66.4W md=3.4  ANSS   PUERTO RICO

P: 26SEP2023 156685    19.0N   68.0W 3.4-5.1 BAAAA  Puerto Rico                

 

O: 30SEP2023 21:28:39  20.6S   67.9W mb=4.4  ANSS   BOLIVIA

P: 29SEP2023 156864    21.0S   69.0W 4.0-5.7 AAAAA  Coast No. Chile            

 

AFRICA AND EUROPE

 

O: 30SEP2023 06:05:57  37.2N    9.1W ML=3.7  MDD    SPAIN                             

P: 22SEP2023 156722    37.0N   10.0W 3.5-5.1 CAAAA  Morocco/Spain              

P: 25SEP2023 156722    39.0N    8.0W 3.5-5.1 BBAAA  Morocco/Spain              

 

O: 30SEP2023 09:38:55  36.9N   27.0E ML=4.3  GFZ    AEGEAN SEA, GREECE           

P: 27SEP2023 156703    38.0N   26.0E 3.0-4.7 BBAAA  Aegean Sea                 

 

NEIC reported this earthquake of M 4.1 in the Dodecanese Islands, Greece was felt with intensity II-III in the area(s) of the Dodecanese Islands, Greece in Kalimnos, Khorion, Pilion, Kardamaina, Kos and in Bodrum, Mugla, Turkey.

 

O: 30SEP2023 08:04:22  31.1N    8.3W ML=3.9  MDD    MOROCCO                      

O: 30SEP2023 08:04:21  31.0N    8.4W mb=4.0  ANSS   MOROCCO

O: 30SEP2023 23:30:22  31.5N    8.1W ML=3.5  MDD    MOROCCO                      

P: 22SEP2023 156722    30.0N    8.0W 3.5-5.4 CAAAA  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 and Oulad Teima, Massa-Draa.

 

O: 30SEP2023 09:38:52  36.9N   27.0E mb=4.1  ANSS   AEGEAN SEA, GREECE       

P: 27SEP2023 156703    38.0N   26.0E 3.0-4.7 BBAAA  Aegean Sea                 

 

O: 30SEP2023 12:46:37  42.8N    6.2W mb=4.0  ANSS   SPAIN                        

P: 22SEP2023 156796    43.0N    9.0W 3.0-4.9 CABAA  Portugal                   

 

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

 

SOUTHWEST PACIFIC

 

 

O: 30SEP2023 19:14:04  16.2S  174.0W mb=4.6  ANSS   TONGA                        

P: 29SEP2023 156849    15.0S  173.0W 4.0-5.8 ABAAA  Samoa Islands               

 

O: 30SEP2023 10:08:02  23.5S  174.8W mb=4.8  ANSS   TONGA                        

P: 27SEP2023 156872    25.0S  176.0W 4.0-5.4 BBAAA  Tonga Islands              

P: 23SEP2023 156871    24.0S  175.0W 4.0-5.6 CAAAA  Tonga Islands               

 

OCEAN RIDGES

 

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

 

 

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: 30SEP2023 17:41:58  30.8N  141.8E mb=4.5  ANSS   IZU ISLANDS, JAPAN

O: 30SEP2023 17:41:58  30.9N  142.0E ML=4.7  MOS    BONIN ISLANDS, JAPAN         

P: 24SEP2023 156732    32.0N  142.0E 4.0-5.4 CBAAA  Off East Coast Honshu      

 

O: 30SEP2023 18:09:00  39.5N  143.6E mb=4.4  ANSS   OFF EAST COAST HONSHU, JAPAN

O: 30SEP2023 18:09:02  39.5N  143.5E ML=4.6  MOS    NORTHERN HONSHU, JAPAN                             

P: 28SEP2023 156735    39.0N  142.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 30SEP2023 05:46:05  30.8N  115.2W ML=3.3  UNAM  FELIPE, BC, MEXICO            

O: 30SEP2023 8:26:39   30.4N  116.1W ML=3.3  UNAM  CARDENAS, BC, MEXICO          

P: 30SEP2023 156741    31.0N  116.3W 2.5-4.7 AAAAA  So. California             

 

O: 30SEP2023 09:35:51  38.1N  118.0W ml=2.1  ANSS   CALIFORNIA-NEVADA BORDER     

P: 29SEP2023 156705    38.2N  117.9W 2.5-4.5 AAAAA  California/Nevada area     

 

O: 30SEP2023 14:45:11  38.3N  119.4W md=2.7  ANSS   CALIFORNIA-NEVADA BORDER     

P: 25SEP2023 156708    38.6N  119.6W 2.5-4.4 BAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 2.6 in Central California was felt with intensity II-III in the area(s) of Central California in Modesto and Fresno.

An earlier event of M 2.7 was felt with intensity II in Reno, Nevada.

 

O: 30SEP2023 10:25:10  38.7N  122.5W md=2.3  ANSS   NORTHERN CALIFORNIA    

P: 29SEP2023 156711    38.7N  122.7W 2.5-4.8 AAAAA  Central California         

 

O: 30SEP2023 16:36:43  40.4N  125.7W mw=3.7  ANSS   OFF COAST OF NORTHERN CALIFORNIA

P: 25SEP2023 156792    40.9N  126.3W 2.5-4.8 BAAAA  Off Coast of No. Calif     

 

O: 30SEP2023 17:25:19  40.5N  124.5W md=2.1  ANSS   OFF COAST OF NORTHERN CALIFORNIA

O: 30SEP2023 15:26:26  40.6N  124.3W mw=4.7  ANSS   OFF COAST OF NORTHERN CALIFORNIA

O: 30SEP2023 17:25:19  40.5N  124.5W md=2.1  ANSS   OFF COAST OF NORTHERN CALIFORNIA         

O: 30SEP2023 17:16:47  40.5N  124.4W mw=4.2  ANSS   OFF COAST OF NORTHERN CALIFORNIA

O: 30SEP2023 17:16:47  40.5N  124.4W mw=4.2  ANSS   OFF COAST OF NORTHERN CALIFORNIA

O: 30SEP2023 19:58:21  40.5N  124.5W md=2.0  ANSS   OFF COAST OF NORTHERN CALIFORNIA

O: 30SEP2023 19:58:21  40.5N  124.5W md=2.0  ANSS   OFF COAST OF NORTHERN CALIFORNIA

P: 26SEP2023 156791    40.4N  124.2W 2.5-4.6 AAAAA  Off Coast of No. Calif     

 

ALASKA

 

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

 

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

 

O: 30SEP2023 09:47:28  34.5N   97.7W ml=2.0  ANSS   OKLAHOMA

P: 28SEP2023 156757    35.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

O: 30SEP2023 11:21:51  35.3N   97.9W ml=1.7  ANSS   OKLAHOMA    

P: 28SEP2023 156757    35.0N   97.0W 2.0-4.1 AAAAA  Southern Plains             

P: 29SEP2023 156756    36.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

HAWAII

 

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

 

STRONG EARTHQUAKE IN MACQUARIE ISLANDS

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 29, 2023

 

The strongest earthquakes in the world today occurred in the world's oceans

with an M 5.8 in the Macquarie Islands south of Australia, an M 5.2 in the Azores and an M 5.2 in the South Sandwich Islands. These occurred near local solar noon and midnight and may have been promoted by tidal stresses with the current full moon as noted in this and previous issues of this summary:

 

"The full moon arrived on September 29 at 09:57 UT. This is the last supermoon of the year. Supermoons occur when the moon is closest to the earth on its elliptical orbit. The considerably increases tidal stress and possibility of strong earthquakes. Longitudes which are at local solar noon at this time are located near 30 East longitude while those at local solar midnight are near 150 West longitude. In the east these include These include Hawaii and areas of eastern Alaska and western Canada and to a lesser extent areas off the coast of Oregon and California while in the east they include Eastern Turkey where an M 7.7 hit on February 6, 2023 as well as Ethiopia and areas off southern Africa and eastern Europe. These and surrounding areas are the most likely to see tidally enhanced seismicity at this time. A large to major earthquake is considered likely in the next week at this time." (September 28-30, 2023)

 

The last similar earthquake in the Macquarie Islands within about 300 km of today's epicenter was an M 5.7-5.8 on November 20, 2020. At the time this summary noted:

 

"The strongest earthquake in the world, and the only event of M>=5 today was an M 5.7 in the Macquarie Island area south of Australia. This continues a series of moderate to moderately strong earthquakes in this area which began several days ago and included event of M 4.6 on November 9; an M 5.7 on November 13 and an M 4.4 on November 14. These events occurred about 1000 km to the east of today's activity. The last activity within about 300 km of today's event with M>4 occurred on August 27, 2020 with M 4.8. The last earthquake of M>=5.7 within about 500 km of today's epicenter was an M 6.0 on August 21, 2019 and an  M 6.5 April 18, 2019 and M 5.9 February 27, 2016." November 20, 2020)

 

O: 30SEP2023 00:32:00  52.8S  140.2E ML=5.8  AUS    MACQUARIE IS                 

O: 30SEP2023 00:31:59  52.9S  140.2E mw=5.8  ANSS   MACQUARIE ISLANDS            

 

The event of M 5.2 in the South Sandwich Islands of larger magnitude than M 5.2 2as an M 5.7 on August 20, 2023. A regional foreshock of M 5.0 hit the South Sandwich Islands on September 25 following a series of such events in mid-September. Forecast 156892 had expected today's earthquake within about 25 km was likely in the South Sandwich Islands around September 27.

 

O: 29SEP2023 22:36:09  58.0S   25.5W mb=5.2  ANSS   SOUTH SANDWICH ISLANDS       

P: 27SEP2023 156892    58.0S   25.0W 4.0-5.8 AAAAA  So. Sandwich Islands       

 

The M 5.2 in the Azores follows a series in the Azores on September 23-25, 2023.

At the time this summary noted:

 

 

A swarm of earthquakes has been occurring in the Azores Islands region of Portugal over the past several days. The largest of these events occurred today with M 4.6 and M 4.1. This activity may be related to the passage of Hurricane Nigel through the region over the past several days as noted in previous issues of this summary. For example it was stated on September 22:

 

"Hurricane Nigel (15) continued today in the area of the central Atlantic north of the Azores and over the mid-Atlantic Ridge with winds up to 70 kts. It is expected to track to the northeast. Some seismic enhancement is possible in the Atlantic Ridge system as this storm passes through." (September 22, 2023)

 

The last earthquake with M>=4.6 within about 200 km of today's epicenters in the Azores occurred as an M 4.8 on January 27, 2020." (September 25, 2023)

 

Today's event was not part of that swarm having occurred about 200 km to the west of the events of September 25. Forecast 156730 expected today's event was likely in late September within about 150 km of this epicenter.

 

O: 29SEP2023 19:05:44  38.4N   30.2W mw=5.2  ANSS   AZORES                       

P: 22SEP2023 156730    38.0N   32.0W 4.0-5.6 CABAA  No. Mid-Atlantic Ridge     

 

The strongest earthquake in the U.S. or Canada today was an M 4.7-4.9 in the eastern Andreanof Islands, Aleutians, Alaska. It was not reported felt in  this remote area. Forecast 156814 had expected today's event was likely within about 100 km was likely to occur around September 26.

 

O: 29SEP2023 15:23:51  51.0N  170.2W ML=4.7  MOS    ANDREANOF ISLANDS                             

O: 29SEP2023 15:24:21  56.7N  173.5W ML=4.9  GFZ    ANDREANOF ISLANDS

O: 29SEP2023 15:23:51  51.1N  170.2W mb=4.2  ANSS   ANDREANOF ISLANDS            

P: 26SEP2023 156814    51.9N  169.2W 3.5-5.0 BAAAA  Fox Islands, Aleutians     

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: 29SEP2023 12:25:52  37.5N   56.8E mb=4.4  ANSS   NORTHERN IRAN                

O: 29SEP2023 12:25:53  37.3N   56.9E ML=4.6  GFZ    NORTHERN IRAN

P: 24SEP2023 156729    37.0N   55.0E 3.8-5.3 BABAA  No. Iran                   

 

O: 29SEP2023 16:29:43  50.2N  153.5E ML=4.0  KRS    KAMCHATKA                     

P: 25SEP2023 156784    49.0N  155.0E 3.5-5.5 BBAAA  NE Pacific                 

 

O: 30SEP2023 01:09:51  45.3N  137.1E ML=4.1  MOS    SAKHALIN, RUSSIA             

P: 22SEP2023 156799    41.0N  136.0E 3.5-5.5 CCAAA  Sea of Japan               

 

INDONESIA AND PHILIPPINES

 

O: 30SEP2023 02:07:43   0.5N  126.3E mb=4.4  ANSS   CERAM, INDONESIA             

P: 27SEP2023 156633     1.0N  127.0E 4.0-5.4 BAAAA  Halmahera                  

 

O: 30SEP2023 06:33:43   9.1S  105.4E mb=4.9  ANSS   SOUTH OF SUMATRA, INDONESIA  

P: 28SEP2023 156655     9.0S  106.0E 4.0-5.4 AAAAA  So. of Java                

 

O: 29SEP2023 11:41:14   4.1S  138.4E ML=4.4  GFZ    PAPUA NEW GUINEA

O: 29SEP2023 11:41:12   4.3S  138.5E mb=4.1  ANSS   PAPUA NEW GUINEA             

P: 27SEP2023 156662     5.0S  138.0E 4.0-5.4 AAAAA  West Irian, PNG            

 

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

 

CENTRAL AND SOUTH AMERICA

 

O: 29SEP2023 07:58:11  15.6S   70.6W ML=4.3  GFZ    CENTRAL PERU

O: 29SEP2023 07:58:12  15.7S   70.5W mb=4.3  ANSS   CENTRAL PERU                 

P: 28SEP2023 156852    17.0S   70.0W 4.0-5.7 ABAAA  So. Peru/Bolivia           

 

O: 29SEP2023 15:32:31  16.7N   95.7W mb=4.5  ANSS   OAXACA, MEXICO               

O: 29SEP2023 14:32:37  16.5N   95.8W ML=4.5  UNAM  TEHUANTEPEC, OAX, MEXICO      

P: 27SEP2023 156667    15.0N   95.0W 3.5-5.5 ABAAA  Chiapas, Mexico            

 

NEIC reported this earthquake of M 4.5 in Oaxaca, Mexico was felt with intensity II-III in the area(s) of Mexico in Tlalnepantla.

 

O: 29SEP2023 15:17:08  17.9N   66.3W md=3.0  ANSS   PUERTO RICO                  

O: 29SEP2023 15:17:08  17.9N   66.3W md=3.0  ANSS   PUERTO RICO        

O: 30SEP2023 03:56:45  17.9N   66.3W md=3.2  ANSS   PUERTO RICO        

O: 29SEP2023 19:38:55  18.8N   67.4W md=3.0  ANSS   PUERTO RICO

O: 29SEP2023 20:20:34  18.8N   67.4W md=3.2  ANSS   PUERTO RICO

P: 28SEP2023 156684    18.0N   69.0W 3.4-4.9 AACAA  Puerto Rico                

 

O: 30SEP2023 00:21:36  19.5N   67.9W md=3.7  ANSS   DOMINICAN REPUBLIC           

P: 26SEP2023 156685    19.0N   68.0W 3.4-5.1 BAAAA  Puerto Rico                

P: 29SEP2023 156689    20.0N   69.0W 3.0-4.6 AAAAA  Bahamas/No. Caribbean      

 

O: 30SEP2023 05:14:07  24.1S   67.1W mb=4.5  ANSS   ARGENTINA

O: 30SEP2023 01:21:01  24.0S   67.0W mb=4.4  ANSS   ARGENTINA                    

P: 29SEP2023 156864    24.0S   69.0W 4.0-5.7 AABAA  Coast No. Chile            

P: 30SEP2023 156860    22.0S   68.0W 4.0-5.9 ABAAA  Argentina                  

 

O: 29SEP2023 11:55:38  27.7S   71.5W mw=4.1  ANSS   VALLENAR, CHILE              

O: 29SEP2023 11:55:41  27.7S   71.4W ML=4.7  GFZ    ATACAMA, CHILE

P: 24SEP2023 156863    28.0S   71.0W 4.0-5.6 AAAAA  Coast Central Chile        

 

O: 29SEP2023  7:21:47  14.7N   93.9W ML=4.0  UNAM  PIJIJIAPAN, CHIS, MEXICO

O: 29SEP2023 17:39:25  14.3N   93.9W ML=4.1  UNAM  MAPASTEPEC, CHIS, MEXICO

O: 30SEP2023 02:21:00  15.7N   93.5W ML=3.9  UNAM  PIJIJIAPAN, CHIS, MEXICO

O: 29SEP2023 17:12:30  15.2N   94.6W ML=4.1  UNAM  CRUZ, OAX, MEXICO             

P: 27SEP2023 156667    15.0N   95.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

AFRICA AND EUROPE

 

O: 30SEP2023 06:05:57  37.2N    9.1W ML=3.7  MDD    SPAIN                        

P: 22SEP2023 156722    37.0N   10.0W 3.5-5.1 CAAAA  Morocco/Spain              

P: 25SEP2023 156722    39.0N    8.0W 3.5-5.1 BBAAA  Morocco/Spain              

 

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

 

SOUTHWEST PACIFIC

 

O: 29SEP2023 15:45:13  17.7S  175.0W mb=4.4  ANSS   TONGA                        

P: 26SEP2023 156855    16.0S  173.0W 4.0-5.8 BBBAA  Tonga Islands               

 

O: 29SEP2023 08:58:02  14.8S  177.7W mb=4.6  ANSS   SAMOA                        

O: 29SEP2023 08:58:03  14.8S  177.9W ML=4.6  GFZ    TONGA

P: 29SEP2023 156849    15.0S  173.0W 4.0-5.8 AACAA  Samoa Islands              

 

O: 30SEP2023 06:10:41  22.5S  171.6E mb=4.9  ANSS   LOYALTY ISLANDS              

P: 26SEP2023 156873    23.0S  173.0E 4.0-5.6 BABAA  Tonga/Fiji                 

 

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

 

OCEAN RIDGES

 

O: 29SEP2023 19:05:44  38.4N   30.2W mw=5.2  ANSS   AZORES                       

P: 22SEP2023 156730    38.0N   32.0W 4.0-5.6 CABAA  No. Mid-Atlantic Ridge     

 

O: 30SEP2023 00:32:00  52.8S  140.2E ML=5.8  AUS    MACQUARIE IS                 

O: 30SEP2023 00:31:59  52.9S  140.2E mw=5.8  ANSS   MACQUARIE ISLANDS            

 

O: 29SEP2023 22:36:09  58.0S   25.5W mb=5.2  ANSS   SOUTH SANDWICH ISLANDS       

P: 27SEP2023 156892    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: 29SEP2023 07:57:52  37.0N  140.2E ML=4.9  GFZ    OFF COAST OF EASTERN HONSHU

O: 29SEP2023 07:57:51  36.8N  140.3E mb=4.5  ANSS   OFF COAST OF EASTERN HONSHU, J

P: 24SEP2023 156733    36.0N  141.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

P: 27SEP2023 156733    35.0N  141.0E 4.0-5.4 ABAAA  Off East Coast Honshu      

P: 26SEP2023 156734    38.0N  140.0E 4.0-5.6 BAAAA  Off East Coast Honshu      

 

NEIC reported this earthquake of M 4.5 in eastern Honshu, Japan was felt with intensity II-III in the area(s) of eastern Honshu, Japan in Tokyo.

 

O: 29SEP2023 15:44:58  40.2N  144.1E ML=4.9  MOS    HOKKAIDO, JAPAN                             

O: 29SEP2023 15:44:57  40.1N  144.2E mb=4.6  ANSS   HOKKAIDO, JAPAN              

P: 25SEP2023 156774    40.0N  143.0E 3.5-5.6 BAAAA  Hokkaido, Japan            

 

O: 30SEP2023 03:07:24  43.4N  143.9E mb=4.4  ANSS   KURIL ISLANDS                

O: 30SEP2023 03:07:24  43.4N  143.9E ML=4.5  MOS    KURIL ISLANDS                             

P: 25SEP2023 156774    40.0N  143.0E 3.5-5.6 BCAAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 29SEP2023 13:14:25  31.1N  115.6W ML=2.9  UNAM  GUERRERO, BC, MEXICO

O: 29SEP2023 13:14:43  31.1N  115.5W ML=3.1  UNAM  GUERRERO, BC, MEXICO

O: 29SEP2023 16:40:41  31.3N  115.3W ML=3.0  UNAM  FELIPE, BC, MEXICO

O: 29SEP2023 19:47:14  31.3N  115.3W ML=3.0  UNAM  FELIPE, BC, MEXICO

O: 30SEP2023 04:03:00  31.4N  115.6W ML=3.4  UNAM  GUERRERO, BC, MEXICO          

O: 29SEP2023 11:45:49  30.8N  116.1W ML=3.5  UNAM  GUERRERO, BC, MEXICO          

O: 29SEP2023 17:00:26  31.4N  115.4W ml=2.9  ANSS   SOUTHERN CALIFORNIA  : 29SEP20

P: 30SEP2023 156741    31.0N  116.3W 2.5-4.7 AAAAA  So. California             

 

O: 29SEP2023 19:13:26  32.7N  115.6W ml=2.9  ANSS   SOUTHERN CALIFORNIA 

O: 30SEP2023 00:30:02  33.1N  115.6W ml=2.4  ANSS   SOUTHERN CALIFORNIA  

O: 29SEP2023 19:03:59  32.7N  115.6W ml=2.1  ANSS   SOUTHERN CALIFORNIA          

P: 28SEP2023 156744    32.4N  115.8W 2.5-4.7 AAAAA  So. California             

 

NEIC reported this earthquake of M 2.9 in Southern California was felt with intensity II-III in the area(s) of Southern California in Heber and Mexicali (IV) and III in Calexico, El Centro and Palmdale.

 

O: 29SEP2023 10:30:23  33.3N  116.8W ml=2.0  ANSS   SOUTHERN CALIFORNIA          

O: 29SEP2023 13:14:26  34.1N  116.4W ml=2.2  ANSS   SOUTHERN CALIFORNIA          

P: 28SEP2023 156747    34.7N  116.4W 2.5-4.9 AAAAA  So. California             

P: 29SEP2023 156745    33.9N  116.9W 2.5-4.8 AAAAA  So. California             

 

O: 29SEP2023 16:46:23  35.3N  118.6W ml=2.1  ANSS   CENTRAL CALIFORNIA           

P: 27SEP2023 156749    35.3N  118.6W 2.5-4.6 AAAAA  So. California             

 

 

O: 29SEP2023 14:03:32  38.8N  122.8W md=2.6  ANSS   NORTHERN CALIFORNIA

O: 30SEP2023 00:25:56  39.0N  122.2W md=2.3  ANSS   NORTHERN CALIFORNIA

O: 29SEP2023 14:46:30  38.8N  122.8W md=2.1  ANSS   NORTHERN CALIFORNIA          

P: 29SEP2023 156711    38.7N  122.7W 2.5-4.8 AAAAA  Central California         

 

O: 29SEP2023 15:47:44  39.7N  120.3W md=2.4  ANSS   NORTHERN CALIFORNIA          

P: 30SEP2023 156790    40.3N  121.2W 2.5-4.5 AAAAA  Northern California        

 

 

ALASKA

 

O: 29SEP2023 15:23:51  51.0N  170.2W ML=4.7  MOS    ANDREANOF ISLANDS                             

O: 29SEP2023 15:24:21  56.7N  173.5W ML=4.9  GFZ    ANDREANOF ISLANDS

O: 29SEP2023 15:23:51  51.1N  170.2W mb=4.2  ANSS   ANDREANOF ISLANDS            

P: 26SEP2023 156814    51.9N  169.2W 3.5-5.0 BAAAA  Fox Islands, Aleutians     

 

O: 29SEP2023 07:40:56  51.5N  178.0W mb=3.7  ANSS   ANDREANOF ISLANDS            

P: 26SEP2023 156809    51.9N  179.8W 3.5-5.3 BAAAA  Andreanoff Isls, Aleutians 

 

O: 30SEP2023 00:46:33  54.7N  156.7W ml=3.2  ANSS   SE of Perryville Alaska      

P: 27SEP2023 156807    54.7N  156.9W 3.5-4.9 BAAAA  Alaska Peninsula           

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

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

 

ROCKY MOUNTAINS REGION

 

O: 29SEP2023 09:11:01  31.8N  104.2W ml=2.0  ANSS   WESTERN TEXAS

O: 29SEP2023 20:14:40  31.5N  104.0W ml=2.5  ANSS   WESTERN TEXAS                

P: 27SEP2023 156738    31.6N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

O: 30SEP2023 06:08:07  32.7N  100.7W ml=3.1  ANSS   WESTERN TEXAS                

O: 30SEP2023 01:11:31  32.7N  100.7W ml=3.0  ANSS   WESTERN TEXAS

P: 23SEP2023 156738    31.6N  101.6W 2.0-4.1 CAAAA  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 Hermleigh.

 

O: 29SEP2023 19:15:44  44.5N  115.2W ml=2.4  ANSS   SOUTHERN IDAHO               

P: 24SEP2023 156780    44.4N  115.1W 2.0-4.1 BAAAA  Montana/Idaho              

 

O: 29SEP2023 12:26:31  44.8N  114.4W ml=2.2  ANSS   SOUTHERN IDAHO               

P: 27SEP2023 156780    44.4N  114.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

 

O: 29SEP2023 20:17:32  60.6N   63.8W mb=4.2  ANSS   GREENLAND                    

O: 29SEP2023 20:17:37  60.5N   64.0W MB=4.1  ECAN of Kangiqsualujjuaq, QC        

O: 28SEP2023 23:15:43  61.3N   59.5W MB=4.3  ECAN of Nuuk, GL                    

P: 23SEP2023 156827    61.0N   58.0W 2.5-4.0 BAAAA  Baffin/Davis Strait Canada 

 

O: 29SEP2023 09:20:27  41.8N   81.0W MB=2.4  ECAN of Cleveland, OH               

P: 26SEP2023 156794    41.8N   81.4W 2.0-3.9 BAAAA  Ohio/Lake Erie             

 

HAWAII

 

O: 30SEP2023 02:42:39  19.1N  155.4W ml=3.2  ANSS   HAWAII                       

P: 22SEP2023 156671    19.2N  155.2W 3.0-4.5 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.

 

STRONG INCREASE IN SEISMICITY WITH FULL SUPER-MOON TIDAL STRESSES

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 28, 2023

 

Seismicity was considerably higher in the world today than in the past week. Included in this activity was an M 6.1 in Vanuatu and an M 6.3 in New Ireland. These are near the equator and as noted in previous issues of this summary may have been promoted by strong tidal stresses associated with the overhead noon time sun at this time of year as In the previous summary this had been addressed as:

 

"A series of earthquakes occurred along the equator over the past several days.

These included moderate events in Gabon, the Central Atlantic, Ecuador, Indonesia and Rwanda among others. This summary has noted in previous issues that seismic enhancement often occurs at sub-solar latitudes due to the vertical tidal stresses. At the fall and spring equinox the sun is directly over the equator and can help promote seismicity along the equator as is currently being seen with the fall equinox." (September 28, 2023)

 

Among today's equatorial earthquakes were a series in Papua New Guinea and New Ireland which included events of MM 5.6, M 5.4-5.5 and M 5.0. The last earthquake of M>=5.4 in New Ireland was an M 6.0 on March 7, 2023 about 250 km north of today's events. A series of smaller events occurred in the past week as a regional activation of seismicity. This included an M 4.5 on September 27, an M 4.7 on September 24 and an M 5.0 on September 22, 2023.  Forecast 156649 had expected today's activity within about 25 km was likely at the end of September.

This activity is at 148 degrees from the M 6.8 in Morocco of September 8 and at 103 degrees from the Prince Edward Islands M 6.8 of May 21, 2023 and at the fifth node (72 degrees) from the Alaska Peninsula and may have been promoted by energy from those sources.

 

O: 29SEP2023 01:53:17   5.2S  152.8E mb=5.0  ANSS   NEW IRELAND

O: 29SEP2023 01:19:37   4.6S  153.2E mw=5.5  ANSS   PAPUA NEW GUINEA

O: 29SEP2023 01:19:36   4.6S  153.1E ML=5.4  GFZ    NEW IRELAND

O: 29SEP2023 00:14:36   5.3S  152.7E mb=4.7  ANSS   PAPUA NEW GUINEA

O: 28SEP2023 19:39:04   5.3S  152.9E mb=4.5  ANSS   PAPUA NEW GUINEA

O: 29SEP2023 01:19:36   4.6S  153.1E ML=5.4  GFZ    NEW IRELAND

O: 28SEP2023 19:21:14   5.2S  152.7E ML=5.6  GFZ    NEW BRITAIN

P: 26SEP2023 156649     7.0S  154.0E 4.0-5.6 ABBAA  New Britain                

P: 22SEP2023 156649     5.0S  153.0E 4.0-5.4 CAAAA  New Britain                

 

A strong earthquake also occurred today in the region of the Kuril Islands, Hokkaido, Japan with M 6.2. The last earthquake within the Kuril Islands and within about 200 km of today's epicenter was an M 7.0 on February 13, 2020 and an M 6.3 on July 7, 2015. On February 13, 2020 this summary noted in regard to the seismic history of this region:

 

 

"Today's event of M 7.0 in the Kuril Islands is the strongest quake recorded in the Southern Kuril Islands in near seven years - since an M 7.2 on April 19, 2013 and prior to that an M 7.3 on November 17, 2002. After the M 7.7 in Cuba region of January 28, it is the strongest earthquake in the world during 2020." (February 13, 2020)

 

Forecast 156774 had expected today's event was likely around September 27 within about 50 km. This epicenter is located at 102 degrees from the M 6.8 in Morocco of September 8, 2023 and may have been promoted by energy from that source.

 

O: 28SEP2023 17:40:04  44.3N  148.6E mw=5.8  ANSS   KURIL ISLANDS                

O: 28SEP2023 17:40:07  44.3N  148.5E ML=6.2  GFZ    KURIL ISLANDS

P: 27SEP2023 156774    44.0N  149.0E 3.5-5.4 AAAAA  Hokkaido, Japan            

 

Another strong earthquake in the world today was an M 6.1 in Central Vanuatu. NEIC reported it was felt with intensity IV in Luganville,  Sanma. The last earthquakes in Vanuatu of equal of greater magnitude than M 6.0 were an M 6.1 on September 21, 2023 about 200 km north of today's epicenter and a similarly placed M 6.5 on August 16, 2023. At the time of the August event this summary noted:

 

"The strongest earthquake in the world today was an M 6.5 in northern Vanuatu. The mainshock was reported by NEIC to have been felt with intensity VII in Vanuatu at Sola Torba and IV in Sanma at Port Olry and Luganville and possibly in the Solomon Islands and New South Wales, Australia. The mainshock was preceded by an M 5.2 regional foreshock several hours earlier. That event was

felt with intensity III in Luganville, Sanma, Vanuatu. An aftershock of M 4.3 was felt with intensity IV in Port Olry, Sanma, Vanuatu. The mainshock within minutes of local solar midnight and most likely was promoted by tidal stresses with the new moon which was completed within hours of the occurrence of this earthquake. This is the first earthquake of M>=6.5 in the world since an M 6.5 in El Salvador on July 19, 2023 with the last new moon. Other strong earthquakes with that new moon were an M 6.6 in Chile and an M 7.2 in the Alaska Peninsula.

 

 

Today's event of M 6.5 is the largest in northern Vanuatu since an M 7.0 about 150 km south of this epicenter on January 8, 2023. The last within 100 km at this magnitude level was an M 6.6 on January 15, 2019.  Today's event occurred within several minutes of local solar midnight and was probably promoted by tidal stresses with today's new moon which maximize near this hour." (August 16, 2023)

 

Today's event also occurred near local solar midnight and may have been promoted by strong tidal stresses with the full moon as noted in this and previous issues of this summary:

 

"The full moon will arrive on September 29 at 09:57 UT. This is the last supermoon of the year. Supermoons occur when the moon is closest to the earth on its elliptical orbit. The considerably increases tidal stress and possibility of strong earthquakes. Longitudes which are at local solar noon at this time are located near 30 East longitude while those at local solar midnight are near 150 West longitude. In the east these include These include Hawaii and areas of eastern Alaska and western Canada and to a lesser extent areas off the coast of Oregon and California while in the east they include Eastern Turkey where an M 7.7 hit on February 6, 2023 as well as Ethiopia and areas off southern Africa and eastern Europe. These and surrounding areas are the most likely to see tidally enhanced seismicity at this time. A large to major earthquake is considered likely in the next week at this time." (September 28, 2023)

 

Forecast 156859 had expected this earthquake in Vanuatu was likely about 150 km south of today's epicenter around September 28.

 

 

O: 28SEP2023 14:40:27  15.5S  167.6E ML=6.0  GFZ    VANUATU

O: 28SEP2023 14:40:26  15.6S  167.7E mw=6.1  ANSS   VANUATU                      

P: 28SEP2023 156859    17.0S  168.0E 4.0-5.9 ABAAA  Vanuatu Islands            

 

The largest earthquake in the U.S. or Canada or vicinity today was an M 4.3 near Nuuk, Greenland. A similar M 4.3 hit this area on August 1, 2023. Other event of M>=4.3 in this area have occurred as an M 5.2 on July 12, 2022 and prior to that in 2005 and 2006 with M 4.4, 4.3 and 4.6.  The M 5.2 in July, 2022 is the largest reported in this area in the past 35 years and was noted in this summary at the time as:

 

 

"A series of unusual earthquake today in many area of the western hemisphere appear to be related to strong tidal stresses associated with the super-moon which will be complete on July 13. ...

 

The M 5.1-5.2 in the Davis Strait near Greenland was the strongest event in the U.S. or Canada today. It may have been lightly felt in this remote epicentral area. This earthquake occurred within about an hour of local solar noon and was probably promoted by high tides associated with the full moon of July 13 and/or geomagnetic effects from today's geomagnetic storm as reported in this summary:

 

This is the strongest earthquake within about 300 km of this epicenter in  at least 30 years. The only event in the region with M>4.6 since 1990 was an M 4.9 about 200 km to the east on July 29, 1999." (July 12, 2022)

 

Forecast 156827 had expected today's event within about 50 km was likely around September 23.

 

O: 28SEP2023 23:15:43  61.3N   59.5W MB=4.3  ECAN of Nuuk, GL                    

P: 23SEP2023 156827    61.0N   58.0W 2.5-4.0 BAAAA  Baffin/Davis Strait Canada 

 

An M 3.0 was also recorded in northern Greenland today. It was not felt in this remote epicentral area. This event occurred within minutes of local solar noon and may have been promoted by strong tidal stresses with the supermoon.

 

O: 28SEP2023 12:45:48  80.0N    1.2W ML=3.0  BER    GREENLAND                             

 

An earthquake of M 3.5 was also felt in southeastern Alaska today. The last earthquake of larger magnitude within about 200 km of this epicenter was an M 4.0 on September 14, 2023. The last event of M>4 in the area was an M 4.4 on August 6, 2023. Forecast 156824 had expected today's event in this region was likely around September 30, 2023.

 

O: 29SEP2023 02:35:52  58.4N  133.5W ML=3.5  PGC    SOUTHEAST ALASKA             

O: 29SEP2023 02:35:52  58.4N  133.5W MB=3.5  ECAN of Juneau, Alaska, USA         

P: 30SEP2023 156824    58.0N  136.0W 3.0-4.4 AABAA  Southeast Alaska            

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: 28SEP2023 14:10:00  40.0N   75.8E ML=4.1  KRN    NORTHERN INDIA                             

P: 30SEP2023 156776    40.0N   75.0E 4.0-5.6 AAAAA  Kirgizstan/Xinjiang        

 

INDONESIA AND PHILIPPINES

 

O: 28SEP2023 09:05:40   2.9S  126.5E mb=4.9  ANSS   SERAM, INDONESIA             

O: 28SEP2023 09:05:40   2.7S  126.6E ML=4.9  GFZ    CERAM, INDONESIA

P: 24SEP2023 156644     4.0S  127.0E 4.0-5.4 BBAAA  Ceram area                 

P: 27SEP2023 156633     1.0N  127.0E 4.0-5.4 AAAAA  Halmahera                  

 

O: 28SEP2023 19:21:17   5.3S  152.8E mw=5.7  ANSS   PAPUA NEW GUINEA             

P: 22SEP2023 156649     5.0S  153.0E 4.0-5.4 CAAAA  New Britain                

P: 26SEP2023 156649     7.0S  154.0E 4.0-5.6 ABAAA  New Britain                

 

O: 28SEP2023 19:43:36   5.9S  149.2E mb=5.2  ANSS   PAPUA NEW GUINEA             

P: 25SEP2023 156650     6.0S  151.0E 4.0-5.4 BABAA  New Ireland                

 

O: 28SEP2023 11:16:44   6.6S  129.6E mb=4.6  ANSS   BANDA SEA                     

O: 28SEP2023 11:16:45   6.6S  129.7E ML=4.9  GFZ    BANDA SEA

O: 28SEP2023 14:00:46   6.3S  130.1E ML=4.9  GFZ    BANDA SEA

O: 28SEP2023 14:00:45   6.3S  130.1E mb=4.9  ANSS   BANDA SEA

P: 29SEP2023 156644     3.0S  129.0E 4.0-5.4 ACAAA  Ceram area                 

P: 29SEP2023 156644     3.0S  129.0E 4.0-5.4 ACAAA  Ceram area                 

 

O: 28SEP2023 17:06:26   9.1N  126.5E mb=4.9  ANSS   MINDANAO, PHILIPPINES        

O: 28SEP2023 17:06:23   9.0N  126.6E ML=5.3  GFZ    MINDANAO, PHILIPPINES

P: 26SEP2023 156629     9.0N  126.0E 4.0-5.4 AAAAA  Central Philippines        

 

O: 28SEP2023 17:26:43  12.5N  126.0E mb=4.7  ANSS   PHILIPPINES                  

O: 28SEP2023 17:26:53  12.6N  126.0E ML=4.8  GFZ    CENTRAL PHILIPPINES

P: 25SEP2023 156674    12.0N  124.0E 3.5-4.9 BABAA  Luzon, Philippines         

 

O: 29SEP2023 01:53:17   5.2S  152.8E mb=5.0  ANSS   NEW IRELAND

O: 29SEP2023 01:19:37   4.6S  153.2E mw=5.5  ANSS   PAPUA NEW GUINEA

O: 29SEP2023 01:19:36   4.6S  153.1E ML=5.4  GFZ    NEW IRELAND

O: 29SEP2023 00:14:36   5.3S  152.7E mb=4.7  ANSS   PAPUA NEW GUINEA

O: 28SEP2023 19:39:04   5.3S  152.9E mb=4.5  ANSS   PAPUA NEW GUINEA

O: 28SEP2023 19:21:14   5.2S  152.7E ML=5.6  GFZ    NEW BRITAIN

P: 26SEP2023 156649     7.0S  154.0E 4.0-5.6 ABBAA  New Britain                

 

O: 28SEP2023 19:43:36   6.0S  149.0E ML=5.2  GFZ    PAPUA NEW GUINEA

P: 25SEP2023 156650     6.0S  151.0E 4.0-5.4 BABAA  New Ireland                

 

CENTRAL AND SOUTH AMERICA

 

O: 28SEP2023 19:46:18  13.3N   90.2W mb=4.6  ANSS   GUATEMALA                    

O: 28SEP2023 19:46:20  13.4N   90.0W ML=4.8  GFZ    GUATEMALA

P: 24SEP2023 156669    13.0N   90.0W 3.5-5.4 BAAAA  Guatemala                  

 

NEIC reported this earthquake of M 4.6 in Guatemala was felt with intensity II-III in the area(s) of Guatemala in Escuintla at San Jose, Siquinala and in Chiapas, Mexico.

 

O: 28SEP2023 12:05:00  18.8N   69.8W mb=4.2  ANSS   DOMINICAN REPUBLIC           

P: 28SEP2023 156684    18.0N   69.0W 3.4-4.9 AAAAA  Puerto Rico                 

 

NEIC reported this earthquake of M 4.2 in the Dominican Republic was felt with intensity II-III in the area(s) of the Dominican Republic in Santo Domingo.

 

O: 28SEP2023 11:26:13  18.8N   64.3W md=3.6  ANSS   VIRGIN ISLANDS

O: 29SEP2023 00:12:18  19.0N   64.4W md=3.7  ANSS   VIRGIN ISLANDS               

P: 27SEP2023 156673    18.0N   64.0W 3.0-5.0 AAAAA  Leeward Islands            

 

O: 29SEP2023 01:54:18  21.0S   68.8W mw=4.2  ANSS   BOLIVIA                      

P: 29SEP2023 156864    21.0S   69.0W 4.0-5.7 AAAAA  Coast No. Chile            

P: 30SEP2023 156860    22.0S   68.0W 4.0-5.9 AAAAA  Argentina                  

 

O: 29SEP2023 05:39:44  21.3S   68.6W mb=4.4  ANSS   CHILE                        

P: 29SEP2023 156864    21.0S   69.0W 4.0-5.7 AAAAA  Coast No. Chile            

 

NEIC reported this earthquake of M 4.2 in Tarapaca, Chile was felt with intensity II-III in the area(s) of Tarapaca, Chile in Iquique.

 

O: 28SEP2023 06:57:12  23.8S   70.2W mb=4.2  ANSS   ANTOFAGASTA, CHILE            

P: 29SEP2023 156864    24.0S   69.0W 4.0-5.7 AAAAA  Coast No. Chile            

 

 

O: 29SEP2023 03:00:00  13.3N   92.6W ML=4.1  UNAM  HIDALGO, CHIS, MEXICO         

O: 29SEP2023 04:32:00  14.0N   93.4W ML=4.1  UNAM  HIDALGO, CHIS, MEXICO

P: 30SEP2023 156666    14.0N   93.0W 3.5-5.6 AAAAA  Chiapas, Mexico            

 

O: 28SEP2023 15:14:45  17.7N   92.8W ML=4.0  UNAM  MACUSPANA, TAB, MEXICO        

P: 25SEP2023 156667    17.0N   94.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

 

O: 28SEP2023 22:58:41  16.0N   95.2W ML=4.0  UNAM  CRUZ, OAX, MEXICO

O: 28SEP2023 13:49:48  15.3N   94.5W ML=3.9  UNAM  TONALA, CHIS, MEXICO          

P: 27SEP2023 156667    15.0N   95.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O: 28SEP2023 19:47:11  19.5N  107.3W ML=4.2  UNAM  VALLARTA, JAL, MEXICO         

P: 28SEP2023 156668    19.0N  109.0W 3.5-5.3 AAAAA  Coast of Jalisco, Mexico   

 

O: 28SEP2023 23:03:34  30.8N  114.4W ML=3.9  UNAM  FELIPE, BC, MEXICO            

P: 30SEP2023 156741    31.0N  116.3W 2.5-4.7 AABAA  So. California             

 

O: 28SEP2023 23:28:58  31.2N  115.3W ML=3.1  UNAM  FELIPE, BC, MEXICO            

P: 29SEP2023 156741    31.9N  116.3W 2.5-4.6 AAAAA  So. California             

 

AFRICA AND EUROPE

 

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

 

SOUTHWEST PACIFIC

 

O: 28SEP2023 14:40:27  15.5S  167.6E ML=6.0  GFZ    VANUATU

O: 28SEP2023 14:40:26  15.6S  167.7E mw=6.1  ANSS   VANUATU                      

P: 28SEP2023 156859    17.0S  168.0E 4.0-5.9 ABAAA  Vanuatu Islands            

 

O: 29SEP2023 01:39:44  17.9S  178.1W mb=4.3  ANSS   FIJI REGION                  

P: 25SEP2023 156856    17.0S  179.0W 4.0-5.4 BAAAA  Tonga Islands              

 

O: 28SEP2023 23:27:48  19.3S  177.9W mb=4.9  ANSS   FIJI REGION                   

O: 28SEP2023 18:19:12  19.2S  177.6W mb=4.4  ANSS   FIJI REGION

O: 28SEP2023 18:19:14  19.3S  177.6W ML=4.8  GFZ    FIJI REGION

O: 28SEP2023 23:27:49  19.3S  177.7W ML=4.8  GFZ    FIJI REGION

P: 27SEP2023 156856    18.0S  179.0W 4.0-5.6 ABAAA  Tonga Islands              

 

 

OCEAN RIDGES

 

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

 

 

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: 28SEP2023 14:29:48  37.4N  137.0E ML=4.8  GFZ    HONSHU, JAPAN

O: 28SEP2023 14:29:48  37.4N  137.2E mb=4.5  ANSS   HONSHU, JAPAN                

P: 30SEP2023 156713    34.0N  137.0E 3.5-4.9 ACAAA  Central/So. Honshu Japan   

 

 

O: 28SEP2023 17:40:04  44.3N  148.6E mw=5.8  ANSS   KURIL ISLANDS                

O: 28SEP2023 17:40:07  44.3N  148.5E ML=6.2  GFZ    KURIL ISLANDS

P: 27SEP2023 156774    44.0N  149.0E 3.5-5.4 AAAAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 28SEP2023 23:44:53  31.8N  116.2W ml=2.5  ANSS   BAJA CALIFORNIA MEXICO       

P: 29SEP2023 156741    31.9N  116.3W 2.5-4.6 AAAAA  So. California             

 

O: 29SEP2023 05:50:26  35.5N  118.4W ml=2.4  ANSS   CENTRAL CALIFORNIA           

P: 27SEP2023 156749    35.3N  118.6W 2.5-4.6 AAAAA  So. California             

 

O: 28SEP2023 07:04:51  38.2N  117.8W ml=2.2  ANSS   NEVADA                       

P: 29SEP2023 156705    38.2N  117.9W 2.5-4.5 AAAAA  California/Nevada area     

 

O: 28SEP2023 17:56:18  38.3N  119.4W md=2.7  ANSS   CENTRAL CALIFORNIA           

P: 25SEP2023 156708    38.6N  119.6W 2.5-4.4 BAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 2.7 in Central California was felt with intensity II-III in the area(s) of Central California in Glenbrook, Nevada and North Fork, California.

 

O: 28SEP2023 10:46:21  39.8N  122.8W md=2.5  ANSS   NORTHERN CALIFORNIA          

P: 26SEP2023 156712    39.6N  123.4W 2.5-4.6 AAAAA  Central California         

 

 

ALASKA

 

O: 28SEP2023 23:13:06  60.5N  151.1W ml=3.0  ANSS   SOUTHERN ALASKA              

P: 27SEP2023 156828    60.8N  151.7W 3.2-5.1 AAAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.0 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska in Soldotna.

 

O: 28SEP2023 23:56:54  61.5N  147.0W ml=3.1  ANSS   SOUTHERN ALASKA              

P: 26SEP2023 156829    60.2N  147.1W 3.2-5.1 ABAAA  Central Alaska             

 

O: 28SEP2023 21:08:30  69.1N  144.6W ml=3.3  ANSS   NORTHERN ALASKA              

 

O: 29SEP2023 02:35:52  58.4N  133.5W ML=3.5  PGC    SOUTHEAST ALASKA             

P: 30SEP2023 156824    58.0N  136.0W 3.0-4.4 AABAA  Southeast Alaska            

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 28SEP2023 20:33:26  44.4N  122.7W ml=2.0  ANSS   OFF COAST OF OREGON          

P: 25SEP2023 156795    45.3N  121.7W 2.0-3.9 BAAAA  Oregon state, U.S.         

 

O: 29SEP2023 03:56:18  54.8N  118.7W ML=2.9  PGC    ALBERTA                      

P: 22SEP2023 156808    52.0N  115.0W 2.0-4.7 CCCAA  Alberta                    

 

ROCKY MOUNTAINS REGION

 

O: 29SEP2023 04:56:21  31.7N  104.4W ml=2.0  ANSS   WESTERN TEXAS

O: 28SEP2023 22:09:14  31.7N  104.5W ml=2.3  ANSS   WESTERN TEXAS

O: 28SEP2023 15:55:43  31.6N  104.6W ml=2.7  ANSS   WESTERN TEXAS

O: 28SEP2023 15:21:28  31.6N  104.5W ml=2.2  ANSS   WESTERN TEXAS

O: 28SEP2023 11:13:23  31.6N  104.5W ml=2.6  ANSS   WESTERN TEXAS          

O: 28SEP2023 11:10:49  32.1N  101.1W ml=2.4  ANSS   WESTERN TEXAS         

O: 28SEP2023 11:02:51  31.6N  104.4W ml=2.2  ANSS   WESTERN TEXAS          

O: 28SEP2023 10:35:52  31.6N  104.6W ml=2.0  ANSS   WESTERN TEXAS 

O: 28SEP2023 10:17:24  31.8N  104.2W ml=2.3  ANSS   WESTERN TEXAS

O: 28SEP2023 09:26:54  31.8N  104.2W ml=3.2  ANSS   WESTERN TEXAS

O: 28SEP2023 09:24:49  31.6N  104.5W ml=2.4  ANSS   WESTERN TEXAS 

O: 28SEP2023 08:34:04  31.6N  104.5W ml=2.4  ANSS   WESTERN TEXAS

O: 28SEP2023 22:09:14  31.7N  104.5W ml=2.3  ANSS   WESTERN TEXAS                

P: 27SEP2023 156738    31.6N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

O: 28SEP2023 10:50:20  32.2N  110.5W ml=3.1  ANSS   ARIZONA                      

P: 30SEP2023 156739    34.7N  111.0W 2.0-4.4 ACAAA  SW U.S.A                   

 

NEIC reported this earthquake of M 3.1 in Arizona was felt with intensity II-III in the area(s) of Arizona in Tucson, Vail, and Chandler.

 

 

EASTERN U.S./CANADA

 

O: 28SEP2023 11:57:03  28.8N   98.1W ml=2.8  ANSS   SOUTHERN TEXAS  

O: 28SEP2023 10:46:09  28.8N   98.5W ml=2.1  ANSS   SOUTHERN TEXAS               

P: 23SEP2023 156738    31.6N  101.6W 2.0-4.1 BCCAA  SW U.S.A                   

 

O: 28SEP2023 08:30:04  34.5N   97.8W ml=2.1  ANSS   OKLAHOMA                     

P: 28SEP2023 156757    35.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

O: 28SEP2023 09:55:15  35.0N   97.6W ml=1.4  ANSS   OKLAHOMA                     

P: 28SEP2023 156757    35.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

O: 29SEP2023 03:57:48  36.5N   99.0W ml=1.6  ANSS   OKLAHOMA                     

P: 29SEP2023 156756    36.0N   97.0W 2.0-4.1 AABAA  Southern Plains            

 

O: 29SEP2023 05:35:26  36.2N   89.4W md=1.8  ANSS   MISSOURI                     

P: 27SEP2023 156724    36.7N   89.7W 2.0-4.1 AAAAA  New Madrid area            

 

O: 28SEP2023 12:45:48  80.0N    1.2W ML=3.0  BER    GREENLAND                             

 

O: 28SEP2023 23:15:43  61.3N   59.5W MB=4.3  ECAN of Nuuk, GL                    

P: 23SEP2023 156827    61.0N   58.0W 2.5-4.0 BAAAA  Baffin/Davis Strait Canada 

 

O: 28SEP2023 21:08:57  47.8N   69.8W MB=1.0  ECAN of Saint-Sim├⌐on, QC           

O: 28SEP2023 11:34:11  47.6N   70.2W MB=0.6  ECAN of La Malbaie, QC              

P: 27SEP2023 156778    47.0N   70.0W 2.0-4.1 AAAAA  Maine                      

 

O: 28SEP2023 02:27:36  41.8N   81.0W MB=2.4  ECAN of Cleveland, OH               

P: 22SEP2023 156786    43.0N   78.0W 2.0-4.1 AAAAA  New York State             

P: 26SEP2023 156794    41.8N   81.4W 2.0-3.9 AAAAA  Ohio/Lake Erie             

 

HAWAII

 

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

 

 

EARTHQUAKES IN DJIBOUTI LINKED TO SOLAR FLARES

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 27, 2023

 

A pair of moderate earthquakes occurred in Djibouti, Africa today.  NEIC reported these earthquakes of M 4.6 and M 4.7 in Djibouti were felt with intensity IV in the area(s) of Djibouti at Jibuti, Tajurah and Dorra.

The earlier event of M 4.7 in Djibouti was felt with intensity V in Jibuti, VI in Ta'izz, Yemen and III Tajurah and in Asmara, Eritrea. These occurred at the peak of C-class solar flares and were probably promoted by SFE associated with this flare. Readers can visit the "SOLAR FLARE" portion of this summary for details of these events.

 

When a similar set of events in Djibouti occurred in January, 2023, this summary noted:

 

"A moderate M 5.1 also occurred near 45 East longitude in the area of Djibouti today. A smaller foreshock preceded this event. This continues activation of this region in recent days much of which was promoted by strong solar and geomagnetic storms. Most of this including an M 5.5 on December 26, 2022 and an M 4.9 on January 9, 2023 occurred about 400 km west of today's event. The last event in Djibouti listed by EMSC was an M 3.8 on January 4, 2023.  At the time this summary noted:

 

" ... an M 3.5 occurred in Djibouti, Ethiopia today. This possibility had been discussed on December 12 as being a possible triggering point from strong solar flares at this time as:

 

"The area of Africa was unusually seismic today. Moderate earthquakes were recorded in Djibouti (M 3.5), South Africa (M 4.4) and Morocco (M 4.5). The earthquake in Djibouti may be the beginning of stronger activity in  that region and in Ethiopia. This usually peaks during high solar flare periods as it is located on the geomagnetic equator in areas of high heat flow." (December 12, 2022, December 26, 2022)

 

The only earthquake in Djibouti with equal or larger magnitude in the past

5 years was an M 4.4 on August 31, 2020. The last of significantly larger magnitude were of M 4.7 on April 14, 2017.  The only event of M>=5 in the  area was an M 5.6 on June 17, 2012, part of a strong regional activation with the last solar active period." (January 18, 2023)

 

Forecast 156669 had expected today's earthquake in the area was likely around

September 28.

 

O: 28SEP2023 01:22:05  11.7N   43.1E mb=4.7  EMSC   GOLFE DE TADJOURA, DJIBOUTI

O: 28SEP2023 05:53:12  11.6N   43.3E mb=4.6  EMSC   NEAR THE COAST OF DJIBOUTI   

P: 28SEP2023 156669    12.0N   40.0E 3.5-5.4 AACAA  Ethiopia                   

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 in the Pribilof Islands of Alaska. The only event in the Pribilof Islands in the past three years of equal or larger magnitude occurred as an M 5.3 on July 4, 2022. At the time this summary noted:

 

 

"The M 5.3 in the Pribilof Islands is the strongest in that region since an M 5.3 on February 1, 2015 and a similar event on January 31, 2015. The only event in the region of larger magnitude in the past 35 years was an M 6.0 on August 14, 1991. At the time of the 2015 activity this summary noted in this regard:

 

"The swarm of moderate earthquakes in the Pribilof Islands north of the Fox Islands in the Bering Sea continued today and expanded. Two earthquakes of M 5.3 and one of M 5.0 today were the strongest events located within 200 km of this epicenter since an M 5.5 west of this epicenter on October 22, 1965." (February 1, 2015, July 4, 2022)

 

Today's activity follows a series of moderate quakes of M>=5 in the Fox and Unimak and Alaska Peninsula area and occurred near local solar midnight. It may have been promoted by today's strong geomagnetic storm as it occurred at the peak of this storm as noted in previous issues of this summary:

 

"The geomagnetic field saw stormy conditions today. The AP level was 32.  High latitudes  saw major storm conditions with AP 68. Middle latitudes were at stormy conditions with AP 26. This may enhance global seismicity at the end of September or in early October." (September 27-28,, 2023)

 

Forecast 156825 had expected enhanced seismicity in this area was likely around

September 24.

 

O: 27SEP2023 09:51:05  56.4N  168.2W mb=4.8  EMSC   PRIBILOF ISLANDS, ALASKA REGIO

P: 24SEP2023 156825    54.1N  164.4W 3.5-4.9 BCBAA  Unimak Islands, Aleutians  

 

A series of earthquakes occurred along the equator over the past several days.

These included moderate events in Gabon, the Central Atlantic, Ecuador, Indonesia and Rwanda among others. This summary has noted in previous issues that seismic enhancement often occurs at sub-solar latitudes due to the vertical tidal stresses. At the fall and spring equinox the sun is directly over the equator and can help promote seismicity along the equator as is currently being seen with the fall equinox.

 

The strongest earthquake in the world today was an M 5.4 off the west coast of  Northern Sumatra, Indonesia. The earthquake on the equator occurred at local solar midnight and may have been promoted by strong tidal stresses with the full moon as noted in this and previous summaries:

 

"The full moon will arrive on September 29 at 09:57 UT. This is the last supermoon of the year. Supermoons occur when the moon is closest to the earth on its elliptical orbit. The considerably increases tidal stress and possibility of strong earthquakes. Longitudes which are at local solar noon at this time are located near 30 East longitude while those at local solar midnight are near 150 West longitude. In the east these include These include Hawaii and areas of eastern Alaska and western Canada and to a lesser extent areas off the coast of Oregon and California while in the east they include Eastern Turkey where an M 7.7 hit on February 6, 2023 as well as Ethiopia and areas off southern Africa and eastern Europe. These and surrounding areas are the most likely to see tidally enhanced seismicity at this time. A large to major earthquake is considered likely in the next week at this time." (September 26-27, 2023)

 

The last earthquake of M>=5.4 within about 200 km of today's event in Sumatra occurred on 5.7 occurred on May 14, 2013. An M 8.2 was recorded near today's epicenter on April 11, 2012.  Forecast 156638 expected today's event was likely within this area around September 26. This epicenter is at 103 degrees from the M 6.8 in Morocco of September 8, 2023 and was probably promoted by energy from that source.

 

 

O: 27SEP2023 17:47:22   0.9N   93.2E Mw=5.4  EMSC   OFF W COAST OF NORTHERN SUMATR

P: 26SEP2023 156638     3.0N   94.0E 4.0-6.0 ACAAA  Nicobar Islands            

 

O: 28SEP2023 00:14:01   0.8N   26.0W mb=4.9  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 23SEP2023 156627     1.0N   28.0W 4.0-5.6 BAAAA  Central Mid-Atlantic Ridg  

 

O: 28SEP2023 00:08:02   2.6N   66.4E mb=4.5  EMSC   CARLSBERG RIDGE              

P: 30SEP2023 156647     1.0S   67.0E 4.0-5.6 ACAAA  Indian Ocean               

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 27SEP2023 09:25:30  47.5N  102.6E mb=4.5  EMSC   CENTRAL MONGOLIA             

P: 21SEP2023 156779    45.0N  102.0E 4.0-5.4 CCAAA  Mongolia                   

 

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

 

INDONESIA AND PHILIPPINES

 

O: 27SEP2023 17:47:22   0.9N   93.2E Mw=5.4  EMSC   OFF W COAST OF NORTHERN SUMATR

P: 26SEP2023 156638     3.0N   94.0E 4.0-6.0 ACAAA  Nicobar Islands            

 

O: 28SEP2023 03:56:00   2.1N   97.4E ML=4.2  EMSC   NORTHERN SUMATRA, INDONESIA  

P: 23SEP2023 156638     1.0N   97.0E 4.0-5.5 BBAAA  Nicobar Islands            

 

O: 27SEP2023 22:32:57   2.8S  128.8E mb=4.6  EMSC   CERAM SEA, INDONESIA

O: 27SEP2023 16:15:22   3.3S  128.8E mb=5.0  EMSC   SERAM, INDONESIA             

P: 29SEP2023 156644     3.0S  129.0E 4.0-5.4 AAAAA  Ceram area                 

 

O: 27SEP2023 20:59:39   6.1S  127.7E ML=4.2  EMSC   BANDA SEA                    

P: 16SEP2023 156379     7.0S  126.0E 4.0-5.6 CAAAA  Banda Sea                  

 

O: 27SEP2023 09:07:21   7.0S  126.2E mb=4.2  EMSC   BANDA SEA                    

O: 27SEP2023 18:59:21   8.4S  129.1E mb=4.2  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 28SEP2023 156641     7.0S  125.0E 4.0-5.7 AAAAA  Banda Sea                  

 

CENTRAL AND SOUTH AMERICA

 

O: 27SEP2023 08:31:55  10.0S   79.0W ML=4.0  EMSC   NEAR COAST OF CENTRAL PERU   

P: 26SEP2023 156653     9.0S   81.0W 4.0-6.0 AABAA  No. Peru                   

 

O: 27SEP2023 09:09:00  13.9N   93.1W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 30SEP2023 156666    14.0N   93.0W 3.5-5.6 BAAAA  Chiapas, Mexico            

 

O: 28SEP2023 06:28:04   1.2N   78.8W mb=4.1  EMSC   COLOMBIA-ECUADOR BORDER REGION

P: 28SEP2023 156645     2.0S   78.0W 4.0-5.7 ACAAA  Ecuador                    

 

O: 27SEP2023 16:04:04  15.2N   93.9W mb=4.6  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 30SEP2023 156666    14.0N   93.0W 3.5-5.6 BBAAA  Chiapas, Mexico            

 

O: 28SEP2023 01:23:45  16.0S   74.7W mb=4.4  EMSC   NEAR COAST OF SOUTHERN PERU  

P: 23SEP2023 156845    15.0S   73.0W 4.0-5.9 BABAA  Central Peru               

 

O: 27SEP2023 10:54:43  16.8N  100.5W ML=4.1  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 27SEP2023 156683    16.0N  100.0W 3.5-5.3 AAAAA  Oaxaca, Mexico             

 

O: 27SEP2023 13:19:20  17.6N   95.0W ML=4.1  EMSC   VERACRUZ, MEXICO             

P: 25SEP2023 156667    17.0N   94.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 27SEP2023 07:01:59  18.8N   69.7W ML=3.2  EMSC   DOMINICAN REPUBLIC           

P: 28SEP2023 156684    18.0N   69.0W 3.4-4.9 AAAAA  Puerto Rico                

 

O: 27SEP2023 22:10:37  18.9N   65.3W MD=3.2  EMSC   PUERTO RICO REGION           

P: 27SEP2023 156673    18.0N   64.0W 3.0-5.0 AAAAA  Leeward Islands            

 

O: 27SEP2023 11:38:01  18.0N   68.2W MD=3.3  EMSC   DOMINICAN REPUBLIC REGION

O: 27SEP2023 09:11:45  19.1N   67.3W MD=3.2  EMSC   PUERTO RICO REGION           

P: 26SEP2023 156685    19.0N   68.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 27SEP2023 12:30:32  19.6N   70.7W ML=3.3  EMSC   DOMINICAN REPUBLIC

O: 27SEP2023 22:43:18  20.0N   70.3W ML=3.0  EMSC   DOMINICAN REPUBLIC REGION

O: 27SEP2023 11:10:59  20.1N   70.3W ML=3.4  EMSC   DOMINICAN REPUBLIC REGION

O: 27SEP2023 07:56:10  19.4N   70.3W ML=3.1  EMSC   DOMINICAN REPUBLIC           

P: 25SEP2023 156684    19.0N   71.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 28SEP2023 06:57:13  23.9S   70.1W ML=4.3  EMSC   ANTOFAGASTA, CHILE           

P: 29SEP2023 156864    24.0S   69.0W 4.0-5.7 AAAAA  Coast No. Chile            

 

O: 27SEP2023 22:20:37  27.3N  111.2W ML=3.4  EMSC   GULF OF CALIFORNIA           

O: 27SEP2023 08:35:55  27.5N  112.6W ML=3.5  EMSC   BAJA CALIFORNIA SUR, MEXICO

P: 25SEP2023 156692    28.0N  112.0W 3.5-5.2 AAAAA  Gulf of California         

 

AFRICA AND EUROPE

 

O: 28SEP2023 01:22:05  11.7N   43.1E mb=4.7  EMSC   GOLFE DE TADJOURA, DJIBOUTI

O: 28SEP2023 05:53:12  11.6N   43.3E mb=4.6  EMSC   NEAR THE COAST OF DJIBOUTI   

P: 28SEP2023 156669    12.0N   40.0E 3.5-5.4 AACAA  Ethiopia                   

 

O: 27SEP2023 09:13:20  31.1N    8.5W ML=3.6  EMSC   MOROCCO                      

P: 22SEP2023 156722    30.0N    8.0W 3.5-5.4 BAAAA  Morocco/Spain              

 

O: 27SEP2023 15:09:33  63.9N   22.6W ML=3.5  EMSC   ICELAND REGION               

P: 29SEP2023 156834    63.0N   23.0W 3.0-4.5 AAAAA  Iceland area               

 

SOUTHWEST PACIFIC

 

O: 28SEP2023 01:43:34  14.9S  173.4W mb=5.0  EMSC   SAMOA ISLANDS REGION         

P: 29SEP2023 156849    15.0S  173.0W 4.0-5.8 AAAAA  Samoa Islands              

 

NEIC reported this earthquake of M 5.0 in Samoa was felt with intensity II-III in the area(s) of Samoa

 

O: 27SEP2023 08:38:43  18.8S  169.3E mb=4.6  EMSC   VANUATU                      

P: 26SEP2023 156859    19.0S  168.0E 4.0-5.6 AAAAA  Vanuatu Islands            

 

O: 27SEP2023 18:00:40  18.8S  178.0W mb=4.8  EMSC   FIJI REGION                  

P: 27SEP2023 156856    18.0S  179.0W 4.0-5.6 AAAAA  Tonga Islands              

 

O: 27SEP2023 23:43:10  22.2S  179.5W mb=4.5  EMSC   SOUTH OF FIJI ISLANDS        

P: 27SEP2023 156872    24.0S  178.0W 4.0-5.4 ABBAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 28SEP2023 00:14:01   0.8N   26.0W mb=4.9  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 23SEP2023 156627     1.0N   28.0W 4.0-5.6 BAAAA  Central Mid-Atlantic Ridg  

 

O: 28SEP2023 00:08:02   2.6N   66.4E mb=4.5  EMSC   CARLSBERG RIDGE              

P: 30SEP2023 156647     1.0S   67.0E 4.0-5.6 ACAAA  Indian Ocean               

 

O: 27SEP2023 17:37:36  53.5S  134.8W mb=4.5  EMSC   PACIFIC-ANTARCTIC RIDGE      

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 27SEP2023 10:56:41  40.7S  172.7E mb=4.2  EMSC   OFF W. COAST OF S. ISLAND, N.Z

O: 27AUG2023 10:56:41  40.8S  172.7E MS=4.7  GEONET South Island, New Zealand

P: 27SEP2023 156886    42.0S  172.0E 3.0-5.3 ABAAA  So. Island, N.Z.           

 

GEONET reported this earthquake was felt with moderate to strong intensity in the area southeast of Wellington, New Zealand and in southern North Island and northern South Island. 1013 reports of felt events were made of which 378 reported weak and 389 light intensity with 137 report of moderate shaking and 16 with strong and 2 severe and 1 with extreme intensity came from the area.

NEIC reported this earthquake of M 4.2 in South Island, New Zealand was felt with intensity II-III in the area(s) of South Island, New Zealand in Tasman at Takaka and Richmond.

 

JAPAN AND KURIL ISLANDS

 

O: 27SEP2023 15:34:33  30.8N  142.0E mb=4.5  EMSC   IZU ISLANDS, JAPAN REGION    

P: 24SEP2023 156732    32.0N  142.0E 4.0-5.4 BBAAA  Off East Coast Honshu      

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 27SEP2023 22:08:51  30.3N  115.9W ML=3.5  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O: 27SEP2023 21:49:59  30.7N  114.1W ML=3.6  EMSC   GULF OF CALIFORNIA           

P: 30SEP2023 156741    31.0N  116.3W 2.5-4.7 BAAAA  So. California             

 

O: 27SEP2023 08:06:48  32.1N  116.5W ML=2.2  EMSC   BAJA CALIFORNIA, MEXICO      

P: 29SEP2023 156741    31.9N  116.3W 2.5-4.6 AAAAA  So. California              

 

O: 28SEP2023 01:09:20  32.3N  115.4W ML=2.0  EMSC   BAJA CALIFORNIA, MEXICO      

P: 28SEP2023 156744    32.4N  115.8W 2.5-4.7 AAAAA  So. California             

 

O: 27SEP2023 23:01:57  35.9N  120.4W MD=2.3  EMSC   CENTRAL CALIFORNIA            

P: 27SEP2023 156709    36.2N  120.8W 2.5-4.4 AAAAA  Central California         

 

O: 27SEP2023 20:00:21  38.6N  119.5W ML=3.4  EMSC   CENTRAL CALIFORNIA           

O: 28SEP2023 00:42:39  38.6N  119.5W MD=2.2  EMSC   CENTRAL CALIFORNIA

P: 25SEP2023 156708    38.6N  119.6W 2.5-4.4 AAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 3.6 in Central California was felt with intensity II-III in Topaz, Coleville, California and Glenbrook Nevada. An M 2.6 aftershock in Central California was felt with intensity II-III in the area(s) of Glenbrook, Nevada.

 

O: 27SEP2023 21:49:54  38.8N  122.8W MD=2.5  EMSC   NORTHERN CALIFORNIA          

P: 29SEP2023 156711    38.7N  122.7W 2.5-4.8 AAAAA  Central California         

 

 

ALASKA

 

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

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 27SEP2023 21:14:02  49.3N  120.5W ML=2.1  EMSC   BRITISH COLUMBIA, CANADA     

P: 19SEP2023 156539    48.9N  122.1W 2.0-3.9 CAAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O: 27SEP2023 19:34:27  31.6N  104.5W ML=2.2  EMSC   WESTERN TEXAS                

P: 27SEP2023 156738    31.6N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

O: 27SEP2023 07:20:20  38.5N  112.8W ML=2.1  EMSC   UTAH                          

P: 25SEP2023 156763    38.3N  112.2W 2.0-4.3 AAAAA  Utah area                  

 

EASTERN U.S./CANADA

 

O: 27SEP2023 05:16:44  45.9N   67.1W MB=1.5  ECAN of Dumfries, NB                

P: 27SEP2023 156772    46.0N   66.0W 2.0-4.4 AAAAA  E. of Maine                 

 

O: 27SEP2023 04:53:07  45.6N   76.1W MB=1.3  ECAN of Constance Bay, ON           

P: 16SEP2023 156522    46.0N   75.0W 2.0-4.0 CAAAA  New York State             

 

O: 26SEP2023 07:25:48  47.5N   70.1W MB=1.7  ECAN of La Malbaie, QC               

P: 27SEP2023 156778    47.0N   70.0W 2.0-4.1 AAAAA  Maine                      

 

O: 27SEP2023 16:05:30  35.0N   97.6W ML=2.1  EMSC   OKLAHOMA                     

P: 28SEP2023 156757    35.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

HAWAII

 

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

 

 

MODERATE, UNUSUAL QUAKE NEAR NAPLES, ITALY RAISES CONCERNS

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 26, 2023

 

An earthquake of M 4.2 near Naples, Italy occurred today and was accompanied by a swarm of minor quakes.  This is the strongest earthquake in the region in about 40 years. The quake occurred in the Phlegraean Fields (Campi Flegrei) which is a vast volcano near Naples. Recent smaller events in the region have raised concern that this may be a precursory swarm to increased seismicity and volcanism in the are - a concern echoed by the National Institute of Geophysics and Volcanology (INGV). The area is populated by nearly half a million residents. The major eruption in the area was an eruption of lava and ash in 1538. Some believe that the extinction of the Neanderthal species was - in part - caused by major eruptions in this area.

 

Forecasts 156775 and 156721 had expected enhanced seismicity in this area was likely around September 28-29.

 

O: 27SEP2023 01:35:35  40.8N   14.2E ML=4.2  EMSC   SOUTHERN ITALY                

P: 28SEP2023 156775    43.0N   16.0E 3.0-5.4 ACAAA  Italy                      

P: 29SEP2023 156721    38.0N   14.0E 3.0-4.9 ACAAA  Mediterranean/Sicily       

 

The strongest 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. This appears to be an aftershock of the M 5.4 in the Alaska Peninsula of September 21. At the time of that event this summary noted:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 5.4 in the Alaska Peninsula Alaska. NEIC reported it was felt with intensity V in Sand Point and King Cove and III in False Pass, Alaska. This is the strongest earthquake in the region of the Alaska Peninsula since an M 5.6 on August 3, 2023. At the time this summary noted:

 

 

"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. It is the second largest earthquake in this area since an M 6.1 on July 28 and July 29, 2020. In the past 15 years many of the strongest earthquakes in this region have occurred in mid- to late-July and early August, perhaps indicating a seasonal triggering component. All events in the region with M>=6 since 2008 have occurred in late July including an M 6.1 on July 16, 2011; an M 6.0 on July 19, 2018; an M 6.1 on July 28, 2020 and an M 7.2 on July 16, 2023." (August 3, 2023, September 21, 2023)

 

Forecast 156825 had expected today's earthquake within about 100 km was likely at the end of September.

 

O: 27SEP2023 02:14:27  55.0N  160.4W mb=5.1  EMSC   ALASKA PENINSULA             

P: 30SEP2023 156825    54.5N  161.8W 3.5-5.0 BAAAA  Unimak Islands, Aleutians  

 

An M 4.1 also occurred today off the coast of Washington State. NEIC reported this earthquake of M 4.1 off the coast of Washington  may have been felt with intensity II-III in the area(s) of  Washington in Everett and Bellevue and in British Columbia, Canada at Victoria and Walnut Grove.  This is the strongest earthquake within about 150 km of this epicenter off the coast of Washington since an M 4.5 on February 22, 2021 and an M 4.1 on September 22, 2020.

 

Forecast 156803 had expected today's event in this region to the north was likely around September 26.

 

O: 25SEP2023 19:46:02  48.8N  128.2W MB=3.4  ECAN of Tofino, BC   

O: 25SEP2023 13:31:47  47.4N  128.9W MB=4.1  ECAN of Tofino, BC   

O: 26SEP2023 02:09:09  47.5N  129.2W MB=4.1  ECAN of Tofino, BC                  

P: 26SEP2023 156803    49.5N  127.2W 2.8-5.3 ABAAA  Vancouver Island area      

P: 30SEP2023 156803    49.3N  129.0W 2.8-5.4 BBAAA  Vancouver Island area      

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: 26SEP2023 17:25:06   2.1S   99.8E mb=4.4  EMSC   KEP. MENTAWAI REGION, INDONESI

P: 27SEP2023 156656     2.0S   99.0E 4.0-5.4 AAAAA  So. of Sumatera            

 

O: 27SEP2023 04:06:53   2.4N  123.2E ML=4.2  EMSC   CELEBES SEA                  

P: 29SEP2023 156626     1.0N  122.0E 4.0-5.8 ABBAA  Celebes Sea                

 

O: 27SEP2023 05:40:03   4.4S  153.1E mb=4.5  EMSC   NEW IRELAND REGION, P.N.G.   

P: 22SEP2023 156649     5.0S  153.0E 4.0-5.4 BAAAA  New Britain                

 

O: 26SEP2023 07:36:48   9.8N  126.1E mb=4.5  EMSC   MINDANAO, PHILIPPINES        

P: 26SEP2023 156629     9.0N  126.0E 4.0-5.4 AAAAA  Central Philippines        

 

O: 26SEP2023 08:04:08  13.2N  145.0E mb=4.8  EMSC   GUAM REGION                  

P: 23SEP2023 156686    13.0N  143.0E 4.0-5.4 BABAA  So. Marianas/Guam          

 

NEIC reported this earthquake of M 4.8 in Guam was felt with intensity II-III in the area(s) of Guam in Merizo and Barrigada (IV), Mangilao, Tamuning, Snajana, Hagatna, Agat, Yigo, and Dededo.

 

O: 26SEP2023 20:05:12  18.3N  146.8E mb=4.6  EMSC   PAGAN REG., N. MARIANA ISLANDS

P: 24SEP2023 156680    19.0N  145.0E 4.0-5.4 AAAAA  No. Marianas               

 

CENTRAL AND SOUTH AMERICA

 

O: 26SEP2023 12:22:02  14.8N   94.1W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 26SEP2023 11:15:45  15.4N   94.7W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 26SEP2023 07:48:06  15.6N   95.2W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 26SEP2023 14:06:08  16.1N   95.3W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 27SEP2023 06:23:24  14.6N   93.3W ML=4.2  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 27SEP2023 156667    15.0N   95.0W 3.5-5.5 AABAA  Chiapas, Mexico            

P: 30SEP2023 156666    14.0N   93.0W 3.5-5.6 BAAAA  Chiapas, Mexico            

 

O: 26SEP2023 17:40:52  17.4N   94.6W mb=4.8  EMSC   VERACRUZ, MEXICO             

P: 25SEP2023 156667    17.0N   94.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

NEIC reported this earthquake of M 4.8 in Guerrero, Mexico was felt with intensity II-III in the area(s) of Oaxaca and Tlalnepantla, Mexico.

 

O: 27SEP2023 02:13:22  17.9N   66.9W MD=3.3  EMSC   PUERTO RICO                  

P: 26SEP2023 156685    19.0N   68.0W 3.4-5.1 ABAAA  Puerto Rico                

 

O: 26SEP2023 19:25:01   1.2N   79.1W mb=4.5  EMSC   NEAR COAST OF ECUADOR        

P: 28SEP2023 156645     2.0S   78.0W 4.0-5.7 ACAAA  Ecuador                    

 

O: 27SEP2023 03:01:22   5.6S   76.7W ML=4.2  EMSC   NORTHERN PERU                

P: 29SEP2023 156653     6.0S   76.0W 4.0-5.9 AAAAA  No. Peru                   

 

O: 27SEP2023 00:28:57  19.1N   65.7W MD=3.1  EMSC   PUERTO RICO REGION           

P: 27SEP2023 156673    18.0N   64.0W 3.0-5.0 ABBAA  Leeward Islands            

 

O: 26SEP2023 08:59:20  19.7N   71.8W ML=3.0  EMSC   DOMINICAN REPUBLIC REGION

O: 27SEP2023 02:55:06  19.6N   70.7W ML=3.0  EMSC   DOMINICAN REPUBLIC           

P: 25SEP2023 156684    19.0N   71.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 26SEP2023 09:11:15  20.2S   69.2W ML=4.8  EMSC   TARAPACA, CHILE              

P: 24SEP2023 156870    20.0S   69.0W 4.0-5.6 AAAAA  So. Peru/Bolivia           

 

NEIC reported this earthquake of M 4.7 in Tarapaca, Chile was felt with intensity II-III in the area(s) of Tarapaca, Chile in Iquique.

 

O: 26SEP2023 10:32:40  24.8N  109.3W ML=4.0  EMSC   GULF OF CALIFORNIA           

P: 21SEP2023 156692    24.0N  109.0W 3.5-5.1 BAAAA  Gulf of California         

 

O: 26SEP2023 19:56:12  27.6S   71.2W mb=4.7  EMSC   OFFSHORE ATACAMA, CHILE      

P: 24SEP2023 156863    28.0S   71.0W 4.0-5.6 AAAAA  Coast Central Chile        

 

O: 26SEP2023 08:18:00  28.8S   71.5W Mw=4.1  EMSC   OFFSHORE ATACAMA, CHILE      

P: 27SEP2023 156863    29.0S   72.0W 4.0-5.8 AAAAA  Coast Central Chile        

 

 

AFRICA AND EUROPE

 

O: 27SEP2023 01:35:35  40.8N   14.2E ML=4.2  EMSC   SOUTHERN ITALY               

P: 28SEP2023 156775    43.0N   16.0E 3.0-5.4 ACAAA  Italy                      

P: 29SEP2023 156721    38.0N   14.0E 3.0-4.9 ACAAA  Mediterranean/Sicily       

 

O: 26SEP2023 13:15:19  41.7N    1.8W ML=4.1  EMSC   SPAIN                        

P: 26SEP2023 156773    42.0N    2.0E 3.0-5.4 AABAA  France                     

P: 29SEP2023 156802    44.0N    1.0W 3.0-5.3 BCAAA  Spain                      

 

O: 26SEP2023 15:54:13  51.5N   16.1E mb=4.5  EMSC   POLAND                       

P: 22SEP2023 156820    51.0N   16.0E 3.0-4.8 BAAAA  Poland                     

 

O: 26SEP2023 18:42:39  63.9N   22.0W ML=3.1  EMSC   ICELAND REGION               

O: 26SEP2023 21:32:25  63.9N   22.6W ML=3.1  EMSC   ICELAND REGION

P: 29SEP2023 156834    63.0N   23.0W 3.0-4.5 BAAAA  Iceland area               

 

SOUTHWEST PACIFIC

 

O: 26SEP2023 23:54:09  23.0S  177.8W mb=4.5  EMSC   SOUTH OF FIJI ISLANDS        

P: 27SEP2023 156872    24.0S  178.0W 4.0-5.4 AAAAA  Tonga Islands              

 

O: 26SEP2023 14:05:31  23.4S  179.8E Mw=5.2  EMSC   SOUTH OF FIJI ISLANDS        

P: 25SEP2023 156873    24.0S  179.0E 4.0-5.4 AAAAA  Tonga/Fiji                 

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 26SEP2023 11:48:23  35.7S  178.4E ML=4.0  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 25SEP2023 156878    37.0S  177.0E 3.0-4.4 ABBAA  North Island, N.Z.         

 

O: 26SEP2023 17:28:34  45.0S  167.5E ML=3.6  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 26SEP2023 17:28:35  45.0S  167.5E MS=4.0  GEONET Not reported Felt

P: 29SEP2023 156887    45.0S  167.0E 3.0-4.9 BAAAA  So. Island, N.Z.           

 

JAPAN AND KURIL ISLANDS

 

O: 27SEP2023 00:33:18  23.2N  142.2E mb=4.5  EMSC   VOLCANO ISLANDS, JAPAN REGION

P: 23SEP2023 156702    24.0N  143.0E 4.0-5.5 BAAAA  Volcano Islands            

 

O: 27SEP2023 02:54:44  31.4N  141.8E mb=5.0  EMSC   IZU ISLANDS, JAPAN REGION    

P: 24SEP2023 156732    32.0N  142.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

O: 26SEP2023 22:21:41  37.5N  141.5E Mw=4.5  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 26SEP2023 156734    38.0N  140.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

 

NEIC reported this earthquake of M 4.5 east of Honshu, Japan was felt with intensity II-III in the area(s) of Honshu, Japan in Miyagi Prefecture.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 26SEP2023 18:16:02  31.2N  116.8W ML=3.7  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 29SEP2023 156741    31.9N  116.3W 2.5-4.6 BAAAA  So. California              

 

O: 26SEP2023 07:22:31  31.5N  115.7W ML=3.0  EMSC   BAJA CALIFORNIA, MEXICO      

O: 26SEP2023 22:55:07  32.0N  116.2W ML=2.0  EMSC   BAJA CALIFORNIA, MEXICO      

P: 26SEP2023 156743    32.1N  116.4W 2.5-4.6 AAAAA  So. California             

 

O: 26SEP2023 12:28:16  35.7N  117.5W ML=2.0  EMSC   SOUTHERN CALIFORNIA

O: 26SEP2023 11:44:47  35.8N  117.6W ML=2.5  EMSC   SOUTHERN CALIFORNIA

O: 27SEP2023 01:29:07  35.9N  117.7W ML=3.0  EMSC   CENTRAL CALIFORNIA

O: 26SEP2023 22:46:22  36.1N  117.9W ML=2.4  EMSC   CENTRAL CALIFORNIA           

P: 27SEP2023 156750    35.9N  117.7W 2.5-4.4 AAAAA  So. California             

 

O: 27SEP2023 02:24:34  36.1N  121.7W MD=2.2  EMSC   OFFSHORE CENTRAL CALIFORNIA  

P: 27SEP2023 156736    35.6N  121.3W 2.5-4.6 AAAAA  Off So. California         

 

O: 26SEP2023 19:10:51  37.4N  117.7W ML=2.0  EMSC   NEVADA                       

P: 24SEP2023 156705    37.4N  117.2W 2.5-4.7 AAAAA  California/Nevada area     

 

O: 26SEP2023 23:25:51  37.0N  121.6W MD=2.4  EMSC   NORTHERN CALIFORNIA

O: 26SEP2023 21:52:25  37.5N  121.8W MD=2.3  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 26SEP2023 11:56:40  37.8N  121.8W MD=2.0  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 24SEP2023 156710    38.0N  122.3W 2.5-4.4 AAAAA  Central California          

 

O: 27SEP2023 01:07:46  39.8N  123.6W MD=2.4  EMSC   NORTHERN CALIFORNIA          

O: 26SEP2023 18:40:02  40.7N  123.6W ML=3.2  EMSC   NORTHERN CALIFORNIA          

P: 27SEP2023 156789    40.0N  123.0W 2.5-4.7 AAAAA  Northern California        

 

NEIC reported this earthquake of M 3.4 in Northern California was felt with intensity II-III in the area(s) of Northern California in Willow Creek, Arcata, Hayfork, Fortuna and Trinidad.

 

ALASKA

 

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

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 25SEP2023 19:46:02  48.8N  128.2W MB=3.4  ECAN of Tofino, BC   

O: 25SEP2023 13:31:47  47.4N  128.9W MB=4.1  ECAN of Tofino, BC   

O: 26SEP2023 02:09:09  47.5N  129.2W MB=4.1  ECAN of Tofino, BC                  

P: 26SEP2023 156803    49.5N  127.2W 2.8-5.3 ABAAA  Vancouver Island area      

P: 30SEP2023 156803    49.3N  129.0W 2.8-5.4 BBAAA  Vancouver Island area      

 

O: 26SEP2023 22:44:39  43.2N  127.0W ML=3.4  EMSC   OFF COAST OF OREGON          

P: 24SEP2023 156792    41.8N  126.9W 2.5-4.4 ABAAA  Off Coast of No. Calif     

 

ROCKY MOUNTAINS REGION

 

O: 26SEP2023 19:10:51  31.7N  104.2W ML=2.6  EMSC   WESTERN TEXAS

O: 26SEP2023 23:24:29  31.7N  104.4W ML=2.1  EMSC   WESTERN TEXAS

O: 26SEP2023 17:12:25  31.7N  104.5W ML=2.0  EMSC   WESTERN TEXAS                

P: 27SEP2023 156738    31.6N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

O: 27SEP2023 05:20:44  32.8N  100.6W ML=2.4  EMSC   WESTERN TEXAS

O: 27SEP2023 04:21:52  32.7N  100.6W ML=2.2  EMSC   WESTERN TEXAS                

P: 23SEP2023 156738    31.6N  101.6W 2.0-4.1 BBAAA  SW U.S.A                   

 

O: 26SEP2023 21:15:00  44.3N  114.1W ML=2.1  EMSC   SOUTHERN IDAHO               

P: 27SEP2023 156780    44.4N  114.1W 2.0-4.1 AAAAA  Montana/Idaho               

 

O: 26SEP2023 23:29:26  47.8N  113.7W ML=2.1  EMSC   WESTERN MONTANA              

P: 22SEP2023 156782    47.5N  115.8W 2.0-3.9 BABAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 27SEP2023 04:53:07  45.6N   76.1W MB=1.3  ECAN of Constance Bay, ON           

P: 25SEP2023 156786    44.0N   74.0W 2.0-4.1 ABBAA  New York State             

 

O: 26SEP2023 07:25:48  47.5N   70.1W MB=1.7  ECAN of La Malbaie, QC              

P: 27SEP2023 156778    47.0N   70.0W 2.0-4.1 AAAAA  Maine                       

 

O: 25SEP2023 12:42:21  46.8N   65.8W MB=2.0  ECAN of Renous-Quarryville part A, NB 

O: 25SEP2023 12:47:12  46.8N   65.9W MB=1.7  ECAN of Blackville, NB              

P: 27SEP2023 156772    46.0N   66.0W 2.0-4.4 AAAAA  E. of Maine                 

 

O: 26SEP2023 19:56:43  34.1N   97.4W ML=2.1  EMSC   OKLAHOMA                     

P: 28SEP2023 156757    35.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

HAWAII

 

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

 

STRONG QUAKE IN TALAUD ISLANDS

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 25, 2023

 

The strongest earthquake today in the world was an M 5.9 in the Talaud Islands, Philippines. NEIC reported it was felt with intensity II-III in Southern Mindanao at Davao and Buayan. PHIVOLCS reported this earthquake was felt with intensity IV in Glan, Sarangani; II in Malapatan and Malungon, Sarangani; Don Marcelino and Malita, Davao Occidental and I in the City of General Santos and Polomolok, South Catabato; City of Davao, Philippines. Similar earthquakes of M 6.0-6.1 hit the Talaud Islands about 100 km south of today's epicenter on February 11, 2023 and January 22, 2022. Forecast 156634 had expected today's activity within about 100 km was likely around September 27.

 

O: 26SEP2023 01:39:45   4.7N  127.5E Mw=5.9  EMSC   KEPULAUAN TALAUD, INDONESIA  

P: 27SEP2023 156634     4.0N  128.0E 4.0-5.4 AAAAA  Halmahera                  

 

A swarm of earthquakes has been occurring in the Azores Islands region of Portugal over the past several days. The largest of these events occurred today with M 4.6 and M 4.1. This activity may be related to the passage of Hurricane Nigel through the region over the past several days as noted in previous issues of this summary. For example it was stated on September 22:

 

"Hurricane Nigel (15) continued today in the area of the central Atlantic north of the Azores and over the mid-Atlantic Ridge with winds up to 70 kts. It is expected to track to the northeast. Some seismic enhancement is possible in the Atlantic Ridge system as this storm passes through." (September 22, 2023)

 

The last earthquake with M>=4.6 within about 200 km of today's epicenters in  the Azores occurred as an M 4.8 on January 27, 2020. Forecast 156523 and 156787

 had expected this activity in the Azores region in mid- to late September.

 

O: 25SEP2023 16:47:26  38.7N   27.3W ML=4.1  EMSC   AZORES ISLANDS, PORTUGAL

O: 25SEP2023 16:44:24  38.7N   27.3W mb=4.6  EMSC   AZORES ISLANDS, PORTUGAL     

P: 15SEP2023 156523    40.0N   30.0W 4.0-5.7 CBBAA  No. Mid-Atlantic Ridge     

P: 28SEP2023 156787    41.0N   30.0W 4.0-5.9 BCBAA  No. Mid-Atlantic Ridge     

 

An earthquake of M 5.4 also occurred today off the southern coast of Michoacan, Mexico. It was not reported felt in this area. This event occurred near local solar midnight and may have been promoted by strong tidal stresses at this hour or by geomagnetic/solar flares which maximize their seismic influence near this time. At M 5.4 this is the first event of this magnitude within  about 150 km of this epicenter since an M 5.5 on March 29, 2022. Events of  M 5.4 also hit the area on July 23, 2016 and January 22, 2011. The only earthquake in this area of significantly larger size in the past 35 years was an M 5.9 on October 28, 1994. At the time of the M 5.4 on March 29, 2022, this summary noted:

 

"NEIC reported this earthquake south of Michoacan Mexico was felt in Coahuayana, Michoacan, Mexico with intensity III. The last earthquake of M>=5.5 within about 200 km of this epicenter south of Michoacan, Mexico occurred on January 22, 2011, eleven years ago with M 5.5. The only other such event in the area in the past 30 years was an M 5.9 on  October 28, 1994." (March 29, 2022)

 

Forecast 156411 had expected today's event was likely in mid- to late September.

 

O: 26SEP2023 06:21:40  15.1N  104.4W Mw=5.4  EMSC   OFF COAST OF MICHOACAN, MEXICO

P: 16SEP2023 156411    15.0N  104.0W 3.5-5.2 CAAAA  Michoacan, Mexico          

 

The largest earthquake in the U.S. or Canada today was an M 4.1 off the coast of Washington. NEIC reported this earthquake of M 4.1 off the coast of Washington  may have been felt with intensity II-III in the area(s) of  Washington in Everett and Bellevue and in British Columbia, Canada at Victoria and Walnut Grove.  This is the strongest earthquake within about 150 km of this epicenter off the coast of Washington since an M 4.5 on February 22, 2021 and an M 4.1 on September 22, 2020.

 

Forecast 156803 had expected today's event in this region to the north was likely around September 26.

 

O: 25SEP2023 13:31:50  47.7N  128.5W mb=4.1  EMSC   OFF COAST OF WASHINGTON      

P: 26SEP2023 156803    49.5N  127.2W 2.8-5.3 ABAAA  Vancouver Island area      

 

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: 26SEP2023 06:53:26  34.9N   73.9E mb=4.5  EMSC   PAKISTAN                      

P: 22SEP2023 156731    35.0N   75.0E 3.8-5.3 BAAAA  Northern India             

 

O: 25SEP2023 23:04:32  24.5N  122.8E mb=4.3  EMSC   TAIWAN REGION                

O: 25SEP2023 23:04:32  24.5N  122.7E mb=4.7  CWB    TAIWAN REGION                

P: 27SEP2023 156701    24.0N  123.0E 4.0-5.6 AAAAA  Taiwan                     

 

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

 

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

 

INDONESIA AND PHILIPPINES

 

O: 26SEP2023 01:39:45   4.7N  127.5E Mw=5.9  EMSC   KEPULAUAN TALAUD, INDONESIA  

P: 27SEP2023 156634     4.0N  128.0E 4.0-5.4 AAAAA  Halmahera                  

 

O: 25SEP2023 10:32:18   6.4S  102.4E ML=4.0  EMSC   SOUTHWEST OF SUMATRA, INDONESI

P: 24SEP2023 156657     5.0S  103.0E 4.0-5.7 ABAAA  So. of Sumatera            

 

O: 25SEP2023 12:11:57   6.7S  129.7E mb=4.5  EMSC   BANDA SEA

O: 25SEP2023 15:48:52   6.9S  130.0E mb=4.7  EMSC   BANDA SEA

O: 25SEP2023 21:01:27   7.2S  129.6E ML=4.3  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 29SEP2023 156644     3.0S  129.0E 4.0-5.4 BCAAA  Ceram area                 

 

CENTRAL AND SOUTH AMERICA

 

O: 25SEP2023 21:49:19  13.8N   93.3W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 30SEP2023 156666    14.0N   93.0W 3.5-5.6 BAAAA  Chiapas, Mexico            

 

O: 26SEP2023 06:21:40  15.1N  104.4W Mw=5.4  EMSC   OFF COAST OF MICHOACAN, MEXICO

P: 16SEP2023 156411    15.0N  104.0W 3.5-5.2 CAAAA  Michoacan, Mexico          

 

O: 25SEP2023 19:41:36  16.3S   74.5W ML=4.2  EMSC   NEAR COAST OF SOUTHERN PERU

O: 26SEP2023 01:30:43  15.2S   75.1W ML=4.0  EMSC   NEAR COAST OF CENTRAL PERU   

P: 26SEP2023 156845    14.0S   76.0W 4.0-5.8 ABAAA  Central Peru                

 

O: 26SEP2023 03:50:09  17.9N   66.3W MD=3.6  EMSC   PUERTO RICO REGION           

O: 26SEP2023 06:32:19  18.5N   66.1W MD=3.2  EMSC   PUERTO RICO REGION           

P: 26SEP2023 156685    19.0N   68.0W 3.4-5.1 AABAA  Puerto Rico                 

 

NEIC reported this earthquake of M 3.6 in Puerto Rico was felt with intensity II-III in the area(s) of Puerto Rico in Santa Isabel (V), Arroyo, Guaynabo, San Juan.

 

O: 25SEP2023 07:12:50  18.5N   73.5W ML=3.5  EMSC   HAITI REGION                  

P: 27SEP2023 156689    20.0N   73.0W 3.0-4.8 ABAAA  Bahamas/No. Caribbean      

 

O: 26SEP2023 00:46:36  19.8N   64.3W MD=4.0  EMSC   NORTH OF THE VIRGIN ISLANDS  

P: 27SEP2023 156673    18.0N   64.0W 3.0-5.0 ABAAA  Leeward Islands            

P: 28SEP2023 156688    20.0N   63.0W 3.0-4.4 AAAAA  Bahamas/No. Caribbean      

 

O: 26SEP2023 05:09:04  26.9N  108.4W ML=4.0  EMSC   SINALOA, MEXICO              

P: 21SEP2023 156692    24.0N  109.0W 3.5-5.1 BCAAA  Gulf of California         

 

 

AFRICA AND EUROPE

 

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

 

SOUTHWEST PACIFIC

 

O: 26SEP2023 06:50:30  10.2S  161.6E mb=4.7  EMSC   SOLOMON ISLANDS              

P: 28SEP2023 156857    11.0S  162.0E 4.0-5.5 AAAAA  Vanuatu Islands             

 

O: 26SEP2023 05:03:33  24.4S  179.8W mb=4.3  EMSC   SOUTH OF FIJI ISLANDS        

P: 27SEP2023 156872    24.0S  178.0W 4.0-5.4 AABAA  Tonga Islands              

 

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

 

OCEAN RIDGES

 

O: 25SEP2023 16:47:26  38.7N   27.3W ML=4.1  EMSC   AZORES ISLANDS, PORTUGAL

O: 25SEP2023 16:44:24  38.7N   27.3W mb=4.6  EMSC   AZORES ISLANDS, PORTUGAL     

P: 15SEP2023 156523    40.0N   30.0W 4.0-5.7 CBBAA  No. Mid-Atlantic Ridge     

P: 28SEP2023 156787    41.0N   30.0W 4.0-5.9 BCBAA  No. Mid-Atlantic Ridge     

 

O: 26SEP2023 01:38:16  78.7N    8.9E ML=3.3  EMSC   SVALBARD REGION              

P: 28SEP2023 156840    79.0N    7.0E 4.0-5.6 AAAAA  Arctic Ocean Region         

 

 

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: 25SEP2023 23:39:22  38.3N  141.2E Mw=4.5  EMSC   NEAR EAST COAST OF HONSHU,   

P: 23SEP2023 156735    38.0N  141.0E 4.0-5.7 AAAAA  Off East Coast Honshu      

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 25SEP2023 08:20:56  30.3N  115.8W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO

O: 25SEP2023 18:02:40  30.9N  115.0W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO      

P: 30SEP2023 156741    31.0N  116.3W 2.5-4.7 BAAAA  So. California             

 

O: 25SEP2023 09:10:06  36.7N  121.4W MD=2.6  EMSC   CENTRAL CALIFORNIA           

P: 27SEP2023 156709    36.2N  120.8W 2.5-4.4 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.6 in Central California was felt with intensity II-III in the area(s) of Central California in Los Banos, Moss Beach.

 

O: 26SEP2023 04:30:50  37.6N  122.2W MD=2.2  EMSC   SAN FRANCISCO BAY, CALIFORNIA

P: 24SEP2023 156710    38.0N  122.3W 2.5-4.4 AAAAA  Central California         

 

O: 26SEP2023 00:26:41  39.7N  120.6W MD=2.7  EMSC   NORTHERN CALIFORNIA          

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

P: 24SEP2023 156790    40.3N  121.2W 2.5-4.5 AAAAA  Northern California        

 

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 Clio, Portola, Downieville and Janesville.

 

 

ALASKA

 

O: 26SEP2023 00:05:43  59.3N  151.7W ML=3.1  EMSC   KENAI PENINSULA, ALASKA      

P: 27SEP2023 156828    60.8N  151.7W 3.2-5.1 ABAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.1 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska in Homer and Willow.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 25SEP2023 13:31:50  47.7N  128.5W mb=4.1  EMSC   OFF COAST OF WASHINGTON      

P: 26SEP2023 156803    49.5N  127.2W 2.8-5.3 ABAAA  Vancouver Island area      

 

O: 25SEP2023 09:03:53  50.9N  130.4W ML=3.5  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 25SEP2023 09:03:53  50.9N  130.4W MB=3.5  ECAN of Port Hardy, BC              

P: 22SEP2023 156812    50.7N  130.5W 3.0-4.9 BAAAA  British Colombia           

 

ROCKY MOUNTAINS REGION

 

O: 25SEP2023 07:20:54  31.7N  104.4W ML=2.1  EMSC   WESTERN TEXAS                

P: 27SEP2023 156738    31.6N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

O: 25SEP2023 21:48:06  44.5N  115.2W ML=2.6  EMSC   SOUTHERN IDAHO               

P: 24SEP2023 156780    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 25SEP2023 09:02:20  28.9N   98.0W ML=3.2  EMSC   SOUTHERN TEXAS

O: 25SEP2023 17:17:19  28.8N   98.4W ML=2.4  EMSC   SOUTHERN TEXAS               

P: 23SEP2023 156738    31.6N  101.6W 2.0-4.1 ACCAA  SW U.S.A                   

 

NEIC reported this earthquake of M 3.1 in Southern Texas was felt with intensity II-III in the area(s) of Southern Texas in Hobson and Falls City (IV) and in Karnes City and San Antonio.

 

O: 25SEP2023 13:25:49  34.1N   97.4W ML=2.3  EMSC   OKLAHOMA

O: 25SEP2023 18:10:11  34.1N   97.4W ML=2.7  EMSC   OKLAHOMA

O: 25SEP2023 12:31:57  34.1N   97.4W ML=2.0  EMSC   OKLAHOMA                      

P: 22SEP2023 156755    34.0N   97.0W 2.0-4.1 BAAAA  Southeast U.S.             

 

O: 26SEP2023 02:20:30  36.4N   98.2W ML=2.4  EMSC   OKLAHOMA                     

P: 29SEP2023 156756    36.0N   97.0W 2.0-4.1 BAAAA  Southern Plains             

 

HAWAII

 

O: 25SEP2023 16:00:12  19.3N  155.1W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

P: 22SEP2023 156671    19.2N  155.2W 3.0-4.5 BAAAA  Hawaii                     

 

 

MODERATE QUAKES NEAR EQUATOR IN GABON AND RWANDA, AFRICA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 24, 2023

 

A pair of moderate earthquakes shook the equatorial zone of Africa today. These events occurred in Gabon (M 4.7) and Rwanda (M 4.5). An M 5.4 occurred on March 9, 2021 and on M 5.5 on December 4, 2022 was followed by an M 4.6 on January 10, 2023. At the time of the December, 2022 event this summary noted:

 

"The moderately strong earthquake of M 5.5 occurred in Gabon, West Africa today. NEIC reported it was felt with maximum intensity VIII in Gabon at Lambarene, Moyen-Ogooue; IV in Booue, Ogooue-Ivindo and III in Libreville Estuaire.

A series of islands apparently cause by the African Plate passing over a hot spot in the mantle aligns from southwest to northeast off the coast of western Africa and passes near this event in Gabon, which may be related to activity associated with this hot spot. The only similar event near Gabon within about 400 km of this epicenter in the past 35 years occurred as an M 5.5 on December 19, 2019 about 300 km northwest of today's epicenter." (December 4, 2022)

 

 

O: 25SEP2023 01:28:55   1.0S   10.3E mb=4.7  EMSC   GABON                        

 

A series of events near M 4.5 occurred last in Rwanda in late May, 2021 and may have been related to volcanism. The last earthquake of significantly larger magnitude in the area of Rwanda within about 200 km of today's epicenter was an M i5.3 on October 20, 2019.  Forecast 156386 had expected today's activity in Rwanda was likely in mid-September.

 

NEIC reported this earthquake of M 4.5 in Rwanda was felt with intensity II-III in the area(s) of Rwanda in Kibungo (IV), Cyangugu, Kigali and Byumba.

 

O: 24SEP2023 14:21:56   2.3S   29.5E mb=4.5  EMSC   RWANDA                       

P: 16SEP2023 156386     2.0S   29.0E 3.0-4.8 CAAAA  Lake Victoria area         

 

The largest earthquake in the U.S. or Canada today was an M 5.0 in the eastern Andreanof Islands. NEIC reported it was felt with light intensity in Atka, Alaska. The last earthquake of M>=5 in the Fox Islands was an M 5.2 on August 20, 2023 with an epicenter about 250 km to the east of today's event. The last event in the Fox Islands within about 200 km of today's earthquake was an M 5.4 on May 13, 2023. At the time this summary noted in this regard:

 

 

"The strongest earthquake in the world today was an M 5.4 in the Fox Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last earthquake in the Fox Islands with greater magnitude was an M 5.5 on November 21, 2022 but the last of significantly larger magnitude in this region was an M 6.8 on January 11, 2022 and aftershocks of M 6.1 on January 22, 2022. At the time this summary noted in this regard:

 

 

"Strong earthquakes of M 6.8 and M 6.4 shook the region of the Fox Islands, Aleutians, Alaska today. NEIC reported the M 6.8 was felt with intensity VI in Nikolski; IV in Dutch Harbor, Unalaska, False Pass and II-III in Akutan, Atka, Cold Bay, and Adak,  Alaska. The M 6.4 aftershock was reported with intensity IV in Nikolski, Alaska and III in Unalaska. An aftershock of M 5.8 was also reported felt with intensity IV in Nikolski and Dutch Harbor, Alaska. The last earthquake within about 250 km of this epicenter in the Fox Islands with M>=6.8 was an M 6.9 on July 27, 2015 about 150 km west of today's epicenter." (January 11, 2022, May 13, 2023)

 

Forecast 156811 had expected enhanced seismicity within about 50 km of today's epicenter was likely around September 25.

 

O: 24SEP2023 15:01:37  52.6N  171.8W mb=5.0  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 25SEP2023 156811    52.4N  170.7W 3.5-5.2 AAAAA  Andreanoff Isls, Aleutians 

 

A series of aftershocks of M 3-4 continued in the Vancouver Island area of British Columbia today. These are apparently aftershocks of the M 5.6 on  September 17. Most of this series occurred near local solar noon and may have been promoted by tidal stresses which maximize near this hour. Forecast 156812 had expected this activity was likely within about 25 km  around September 22.

 

O: 23SEP2023 19:44:02  50.7N  130.4W MB=3.3  ECAN of Port Hardy, BC              

O: 23SEP2023 19:32:36  50.6N  130.5W MB=3.2  ECAN of Port Hardy, BC              

P: 22SEP2023 156812    50.7N  130.5W 3.0-4.9 AAAAA  British Colombia           

 

An earthquake of M 3.9 was also felt in southern Oklahoma today. NEIC reported this earthquake of M 3.7-3.9 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma with IV in Marlow, Comanche, Altus and lesser shaking in Duncan,  Loco, Hennepin, Ryan, Altus,  and in Texas at Lewisville and the Colony. This is generally south of the current moderate seismicity in the area. The last earthquake in Oklahoma within about 100 km of the M 3.9 today was an M 4.4 on October 13, 2010. The only event in the past 35 years closer than 100 km to today's epicenter with M>=3.9 occurred on January 18, 1995. Forecast 156755 had expected today's event was likely within 100 km around September 22.

 

O: 24SEP2023 19:15:00  35.0N   97.5W ML=2.2  EMSC   OKLAHOMA

O: 25SEP2023 00:40:32  34.5N   97.8W mb=3.9  EMSC   OKLAHOMA                     

P: 22SEP2023 156755    34.0N   97.0W 2.0-4.1 BAAAA  Southeast U.S.             

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: 24SEP2023 19:32:25  29.8N   91.3E ML=4.3  EMSC   EASTERN XIZANG               

P: 25SEP2023 156766    30.0N   90.0E 3.8-5.3 AAAAA  Xizang                     

 

O: 24SEP2023 17:39:03  36.1N   70.9E mb=4.3  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 22SEP2023 156717    37.0N   71.0E 3.8-5.2 AAAAA  Hindu Kush/Pakistan        

 

O: 25SEP2023 05:56:34  42.0N   81.5E mb=4.5  EMSC   SOUTHERN XINJIANG, CHINA     

P: 15SEP2023 156512    42.0N   83.0E 4.0-5.4 CAAAA  Kirgizstan/Xinjiang        

 

O: 24SEP2023 17:22:04  51.2N   92.5E mb=4.0  EMSC   SOUTHWESTERN SIBERIA, RUSSIA 

P: 29SEP2023 156779    46.0N   96.0E 4.0-5.6 BCCAA  Mongolia                   

 

O: 25SEP2023 02:44:18  53.3N  159.6E mb=4.3  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 26SEP2023 156813    52.0N  160.0E 4.0-5.5 ABAAA  E. of Kamchatka            

 

O: 25SEP2023 05:27:16  67.4N  170.3W ML=3.9  EMSC   NEAR N COAST OF CHUKOTKA, RUSS

 

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

 

INDONESIA AND PHILIPPINES

 

O: 24SEP2023 21:44:20   2.3S  121.0E ML=4.2  EMSC   SULAWESI, INDONESIA          

P: 21SEP2023 156659     1.0S  120.0E 4.0-5.5 BBAAA  Sulawesi area              

 

O: 24SEP2023 23:23:41   2.6S  139.2E ML=4.0  EMSC   NEAR N COAST OF PAPUA, INDONES

P: 21SEP2023 156654     3.0S  140.0E 4.0-5.6 BAAAA  Papua New Guinea           

 

O: 24SEP2023 09:36:07   4.4S  153.5E mb=4.7  EMSC   NEW IRELAND REGION, P.N.G.   

P: 22SEP2023 156649     5.0S  153.0E 4.0-5.4 AAAAA  New Britain                

 

O: 24SEP2023 15:08:51   6.1S  130.4E ML=4.0  EMSC   BANDA SEA                    

P: 29SEP2023 156644     3.0S  129.0E 4.0-5.4 BCBAA  Ceram area                  

 

O: 24SEP2023 16:34:31   6.9N   94.6E mb=4.8  EMSC   NICOBAR ISLANDS, INDIA REGION

O: 24SEP2023 21:01:44   6.9N   94.9E ML=4.5  EMSC   NICOBAR ISLANDS, INDIA REGION

O: 24SEP2023 21:32:00   6.7N   95.2E ML=4.0  EMSC   NICOBAR ISLANDS, INDIA REGION

P: 21SEP2023 156638     5.0N   95.0E 4.0-5.9 BBAAA  Nicobar Islands            

 

O: 25SEP2023 05:11:20   7.1S  129.1E mb=4.8  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 29SEP2023 156644     3.0S  129.0E 4.0-5.4 BCAAA  Ceram area                 

 

O: 24SEP2023 23:20:14   8.0S  107.1E ML=4.1  EMSC   JAVA, INDONESIA              

P: 29SEP2023 156655     7.0S  107.0E 4.0-5.6 BAAAA  So. of Java                

 

O: 25SEP2023 04:01:39  10.3N  126.2E ML=4.1  EMSC   PHILIPPINE ISLANDS REGION    

P: 21SEP2023 156674    10.0N  125.0E 3.5-5.1 BAAAA  Luzon, Philippines         

 

 

CENTRAL AND SOUTH AMERICA

 

O: 25SEP2023 00:56:42  12.7N   84.7W ML=4.3  EMSC   NICARAGUA                    

P: 28SEP2023 156679    10.0N   86.0W 3.5-5.2 BCBAA  Nicaragua                   

 

O: 24SEP2023 14:47:39  13.1S   74.2W ML=4.2  EMSC   CENTRAL PERU                 

P: 26SEP2023 156845    14.0S   76.0W 4.0-5.8 AABAA  Central Peru               

 

 

O: 25SEP2023 06:57:45  13.9N   92.0W mb=4.7  EMSC   OFFSHORE GUATEMALA            

P: 17SEP2023 156406    14.0N   92.0W 3.5-5.2 CAAAA  Guatemala                  

P: 20SEP2023 156406    13.0N   91.0W 3.5-5.1 BAAAA  Guatemala                  

 

O: 24SEP2023 21:31:02  14.1N   94.1W ML=4.2  EMSC   OFF COAST OF CHIAPAS, MEXICO 

O: 24SEP2023 12:04:26  15.6N   93.8W ML=4.2  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 24SEP2023 13:18:04  15.1N   94.5W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 21SEP2023 156666    15.0N   94.0W 3.5-5.6 BAAAA  Chiapas, Mexico            

 

O: 24SEP2023 18:00:46  15.9N   98.9W ML=4.0  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 23SEP2023 156682    16.0N   98.0W 3.5-5.4 AAAAA  Oaxaca, Mexico             

 

O: 25SEP2023 04:11:55  18.7N   67.1W MD=3.2  EMSC   PUERTO RICO REGION

O: 25SEP2023 01:23:00  17.9N   66.9W MD=3.0  EMSC   PUERTO RICO

O: 24SEP2023 21:19:57  18.1N   68.4W MD=3.5  EMSC   MONA PASSAGE, DOMINICAN REPUBL

P: 26SEP2023 156685    19.0N   68.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 25SEP2023 02:25:39  19.1N   64.6W MD=3.6  EMSC   VIRGIN ISLANDS REGION        

P: 27SEP2023 156673    18.0N   64.0W 3.0-5.0 ABAAA  Leeward Islands            

 

AFRICA AND EUROPE

 

O: 25SEP2023 01:28:55   1.0S   10.3E mb=4.7  EMSC   GABON                        

 

O: 24SEP2023 14:21:56   2.3S   29.5E mb=4.5  EMSC   RWANDA                       

P: 16SEP2023 156386     2.0S   29.0E 3.0-4.8 CAAAA  Lake Victoria area         

 

O: 25SEP2023 01:48:11  38.2N   22.7E mb=4.1  EMSC   GREECE                       

P: 23SEP2023 156727    39.0N   22.0E 3.0-4.4 AAAAA  No. Greece                 

 

O: 24SEP2023 20:18:20  39.3N   40.2E ML=4.0  EMSC   EASTERN TURKEY               

P: 24SEP2023 156761    38.0N   39.0E 3.5-5.0 ABAAA  Turkey                     

 

O: 24SEP2023 23:35:03  63.9N   21.5W ML=3.0  EMSC   ICELAND REGION                

O: 24SEP2023 20:49:57  63.9N   21.5W ML=2.9  EMSC   ICELAND REGION

P: 29SEP2023 156834    63.0N   23.0W 3.0-4.5 BAAAA  Iceland area               

 

SOUTHWEST PACIFIC

 

O: 24SEP2023 23:50:40  14.5S  173.6E mb=4.5  EMSC   FIJI REGION                   

P: 25SEP2023 156846    14.0S  172.0E 4.0-5.4 AABAA  Fiji Islands               

 

O: 24SEP2023 08:13:46  17.6S  178.8W mb=4.5  EMSC   FIJI REGION

O: 24SEP2023 11:01:53  18.0S  178.4W mb=4.4  EMSC   FIJI REGION                  

P: 25SEP2023 156856    17.0S  179.0W 4.0-5.4 AAAAA  Tonga Islands              

P: 27SEP2023 156856    18.0S  179.0W 4.0-5.6 BAAAA  Tonga Islands              

 

O: 24SEP2023 21:24:58  20.4S  174.3W mb=4.7  EMSC   TONGA                        

P: 22SEP2023 156871    20.0S  174.0W 4.0-5.6 AAAAA  Tonga Islands              

 

O: 25SEP2023 05:21:56  24.4S  177.0W mb=4.7  EMSC   SOUTH OF FIJI ISLANDS        

P: 27SEP2023 156872    24.0S  178.0W 4.0-5.4 AAAAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 25SEP2023 04:12:19  55.9S   28.3W mb=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 27SEP2023 156891    56.0S   29.0W 4.0-6.0 AAAAA  So. Sandwich Islands       

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 24SEP2023 10:25:52  36.1S  179.3E ML=4.0  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 25SEP2023 156878    37.0S  177.0E 3.0-4.4 AABAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

O: 25SEP2023 03:38:00  33.8N  137.0E mb=4.3  EMSC   NEAR S. COAST OF WESTERN HONSHU JAPAN

P: 26SEP2023 156728    35.0N  136.0E 3.5-4.9 ABAAA  No. Honshu, Japan          

 

O: 24SEP2023 14:30:36  35.4N  141.3E ML=4.0  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 24SEP2023 156733    36.0N  141.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

O: 25SEP2023 04:35:50  41.7N  142.0E mb=4.8  EMSC   HOKKAIDO, JAPAN REGION       

P: 23SEP2023 156774    41.0N  141.0E 3.5-5.6 AAAAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 25SEP2023 06:42:33  35.1N  119.6W ML=3.2  EMSC   CENTRAL CALIFORNIA           

P: 24SEP2023 156748    34.7N  119.0W 2.5-4.6 AAAAA  So. California             

 

NEIC reported this earthquake of M 3.1 in Central California was felt with intensity II-III in the area(s) of Central California in New Cuyama, Taft, Ventura, Bakersfield, Oxnard, Moorpark, Camarillo.

 

O: 24SEP2023 16:55:47  35.5N  118.4W ML=2.5  EMSC   CENTRAL CALIFORNIA           

P: 23SEP2023 156749    35.4N  118.5W 2.5-4.6 AAAAA  So. California             

 

O: 24SEP2023 19:28:54  38.2N  122.7W MD=2.2  EMSC   NORTHERN CALIFORNIA          

P: 24SEP2023 156710    38.0N  122.3W 2.5-4.4 AAAAA  Central California         

 

ALASKA

 

O: 24SEP2023 18:20:15  51.6N  179.4E ML=4.1  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 28SEP2023 156822    51.0N  178.0E 4.0-5.8 BAAAA  Rat Islands                

 

O: 25SEP2023 05:24:33  51.9N  178.5W ML=3.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24SEP2023 156809    50.8N  179.5W 3.5-5.3 AAAAA  Andreanoff Isls, Aleutians 

 

O: 24SEP2023 15:01:37  52.6N  171.8W mb=5.0  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 25SEP2023 156811    52.4N  170.7W 3.5-5.2 AAAAA  Andreanoff Isls, Aleutians 

 

O: 23SEP2023 21:52:39  55.4N  135.3W MB=3.5  ECAN of Sitka, AK                   

P: 14SEP2023 156547    55.0N  135.0W 3.0-4.9 CAAAA  British Colombia           

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 23SEP2023 19:44:02  50.7N  130.4W MB=3.3  ECAN of Port Hardy, BC              

O: 23SEP2023 19:32:36  50.6N  130.5W MB=3.2  ECAN of Port Hardy, BC              

P: 22SEP2023 156812    50.7N  130.5W 3.0-4.9 AAAAA  British Colombia            

 

O: 23SEP2023 21:52:39  55.4N  135.3W MB=3.5  ECAN of Sitka, AK                   

P: 14SEP2023 156547    55.0N  135.0W 3.0-4.9 CAAAA  British Colombia           

 

ROCKY MOUNTAINS REGION

 

O: 24SEP2023 07:13:14  31.6N  104.6W ML=3.2  EMSC   WESTERN TEXAS                

O: 24SEP2023 07:13:14  31.6N  104.6W ML=3.3  ANSS   WESTERN TEXAS                

O: 24SEP2023 07:11:41  31.7N  104.6W ML=2.8  EMSC   WESTERN TEXAS

P: 22SEP2023 156738    32.5N  104.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

NEIC reported this earthquake of M 3.3 in Western Texas was felt with intensity II-III in the area(s) of Western Texas in Tarzan.

 

O: 25SEP2023 03:18:10  32.4N  102.0W ML=3.1  EMSC   WESTERN TEXAS                

O: 24SEP2023 08:50:18  32.7N  100.7W ML=2.8  EMSC   WESTERN TEXAS                

P: 23SEP2023 156738    31.6N  101.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

O: 24SEP2023 12:55:33  44.7N  114.4W ML=2.4  EMSC   SOUTHERN IDAHO               

P: 24SEP2023 156780    44.4N  115.1W 2.0-4.1 AAAAA  Montana/Idaho              

P: 27SEP2023 156780    44.4N  114.1W 2.0-4.1 BAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 24SEP2023 23:59:29  45.7N   73.5W MB=3.3  ECAN of Repentigny, QC, felt        

P: 26SEP2023 156785    46.2N   72.7W 2.0-4.1 AAAAA  New England                

 

NEIC reported this earthquake of M 2.7 in Quebec, Canada was felt with intensity II-III in the area(s) of Quebec, Canada in Vercheres, Montreal, Oka-Kanesatake and in Rouses Point, New York.

 

O: 24SEP2023 16:08:42  49.4N   66.5W MB=1.8  ECAN of Sainte-Anne-des-Monts, QC   

P: 28SEP2023 156772    49.0N   66.0W 2.0-4.3 BAAAA  E. of Maine                

 

O: 24SEP2023 10:16:41  45.1N   66.7W MB=1.5  ECAN of Beaver Harbour, NB          

P: 27SEP2023 156772    46.0N   66.0W 2.0-4.4 BAAAA  E. of Maine                

 

O: 23SEP2023 13:07:13  47.9N   70.0W MB=1.6  ECAN of Saint-Sim├⌐on, QC           

O: 23SEP2023 12:11:30  47.6N   70.2W MB=1.3  ECAN of La Malbaie, QC              

P: 22SEP2023 156778    47.0N   70.0W 2.0-4.1 AAAAA  Maine                      

 

O: 24SEP2023 19:15:00  35.0N   97.5W ML=2.2  EMSC   OKLAHOMA

O: 25SEP2023 00:40:32  34.5N   97.8W mb=3.9  EMSC   OKLAHOMA                     

P: 22SEP2023 156755    34.0N   97.0W 2.0-4.1 BAAAA  Southeast U.S.             

 

HAWAII

 

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

 

QUIET DAY WITH DISTURBED IONOSPHERE

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 23, 2023

 

It was a quiet day in global seismicity. The largest quakes was an M 5.1  in the Loyalty Islands of the southwest Pacific and in Nias Indonesia. These events were not reported felt. This seismic lull occurred as a new geomagnetic storm was brewing with AP 21 on September 24. It is likely there is a relation between the seismic lull and this geomagnetic storm.

 

"The geomagnetic field saw disturbed conditions today. The AP level was 10.  High latitudes  saw active conditions with AP 24. Middle latitudes were at quiet conditions with AP 9. The geomagnetic field is expected to see major storm conditions September 25 with minor storms September 24 and active September 26.   Solar activity is expected to be at disturbed levels  September 24-26 with a moderate chance (60%) of an M-class flare and 10% chance of an X-class flare. A proton storm is expected with 20% probability in this time period." (September 23-24, 2023)

 

The M 5.1 in the Loyalty Islands has been relatively quiet in recent months with the only events of larger magnitude an M 5.3 on July 3 and an M 5.2 on September 13, 2023. Forecast 156865 had expected this event was likely within about 100 km around September 24. 

 

O: 23SEP2023 15:51:21  22.2S  170.5E Mw=5.1  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 24SEP2023 156865    23.0S  170.0E 4.0-5.4 AAAAA  Loyalty Islands            

 

An earthquake of M 5.1 also occurred in Sumatra today in the Nias Region of Indonesia. A major M 7.3 hit the Nias area on April 24, 2023. This may be a regional aftershock of that event. Forecast 156638 expected today's event within about 100 km was likely around September 23.

 

O: 24SEP2023 01:27:34   2.0N   97.0E mb=5.1  EMSC   NIAS REGION, INDONESIA       

P: 23SEP2023 156638     1.0N   97.0E 4.0-5.5 AAAAA  Nicobar Islands            

 

NEIC reported this earthquake of M 4.0 in Georgia was felt with intensity II-III in the area(s) of Georgia in Samgori, Tbilisi, Zahesi, Mtskheta, Tskneti, Tianeti and in Balakhonovskoye, Russia. The last activity in Georgia of M>=4 occurred February 11-12, 2023 with maximum intensity M 4.4. At the time this summary noted:

 

"The earthquake of M 4.4 in the Caucasus was the strongest in that area since M 5.3 on September 27, 2022. At the time this summary noted in this regard:

 

"An M 5.3 was also felt in eastern Turkey near the Georgia border today. NEIC reported these earthquake of M 5.3 and 4.4 in Eastern Turkey was felt with intensity CI in Susuz, Kars, Turkey and II-III in the area(s) of  in Tbilisi and Batumi, Ajaria, Georgia.  A similar M 5.3 hit within about 200 km on February 13, 2022 but the only earthquake of larger magnitude in this area of eastern Turkey in the past thirty-two years was an M 5.5 on December 16, 1990." (September 28, 2022, February 11, 2023)

 

Forecast 156770 had expected today's event within about 200 km was likely around September 24.

 

O: 24SEP2023 04:00:07  41.8N   45.0E mb=4.0  EMSC   GEORGIA (SAK'ART'VELO)       

P: 24SEP2023 156770    40.0N   44.0E 3.5-5.2 ABAAA  Caucasus/Caspian Sea       

 

NEIC reported an earthquake of M 2.9 in Northern California was felt with intensity II-III in the area(s) of Northern California in Paradise, Lodi.

An earlier M 3.3 was felt with intensity II-III in Patterson, Newman, Tracy, Gustine, Manteca, San Jose, Sunnyvale, Aptos, Palo Alto. NEIC reported this earthquake of M 2.7 in San Francisco, California was felt with intensity II-III in the area(s) of San Francisco, California in Milpitas, San Jose, Sunol among others. These appear to be largest long-term aftershocks of the M 4.5 of September 19, 2023. This area appears to be promoted by geomagnetic storms and by solar flares as noted with the M 4.5 in this summary as:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 4.5 in Northern California east of the San Francisco, California Bay. This event was widely felt throughout much of central and northern California. … The mainshock was preceded by an M 4.0 foreshock, among others of smaller magnitude and by a number of felt aftershocks of M>=3. ...  This largest event in the series may have been triggered by an M1.1 class solar flare which coincided with it.

 

...

 

This is the first M-class solar flare in the past three days.

 

The earthquakes in California also occurred at the height of the strongest geomagnetic storm since September 2 and may have been promoted by changes in the geomagnetic field associated with that storm. This summary noted in this regard:

 

"The geomagnetic field saw minor storm conditions today. The AP level was 30.  High latitudes  saw major storm conditions with AP 49. Middle latitudes were at active conditions with AP 21. This is the strongest disturbance in the geomagnetic field since AP reached 38 on September 2 with high latitude AP 59 on that date. This storm is expected to intensity on September 19, 2023. Some initial seismic enhancement is likely with a stronger intense period around September 21-22." (September 19, 2023)

 

Today's event in Northern California is the first of M>=4.5 within about 100 km of today's epicenter since an M 5.1 about 50 km southwest of this on October 25, 2022 and may be a regional aftershock of that event." (September 19, 2023)

 

Forecast 156710 had expected this aftershock was likely within about 50 km around September 23.

 

O: 23SEP2023 22:02:35  37.4N  121.8W MD=2.7  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 23SEP2023 156710    37.4N  121.3W 2.5-4.4 AAAAA  Central California         

 

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: 24SEP2023 04:43:04  29.5N   83.6E ML=4.1  EMSC   XIZANG-NEPAL BORDER REGION   

P: 27SEP2023 156765    30.0N   82.0E 3.8-5.4 BABAA  Xizang                     

 

O: 23SEP2023 14:24:35  17.2N   96.2E mb=4.8  EMSC   MYANMAR                      

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

 

NEIC reported this earthquake of M 4.8 in Myanmar was felt with intensity II-III in the area(s) of Myanmar in Bago (V); IV in Rangoon and Kyaiklat and II-III in Syriam, Maubin, and Mandalay.

 

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

 

INDONESIA AND PHILIPPINES

 

O: 23SEP2023 07:03:43   0.7S  135.9E ML=4.0  EMSC   BIAK REGION, INDONESIA       

P: 26SEP2023 156661     2.0S  135.0E 4.0-5.4 BAAAA  West Irian, PNG            

 

O: 24SEP2023 01:27:34   2.0N   97.0E mb=5.1  EMSC   NIAS REGION, INDONESIA       

P: 23SEP2023 156638     1.0N   97.0E 4.0-5.5 AAAAA  Nicobar Islands            

 

O: 23SEP2023 19:43:15   7.4S  122.0E ML=4.3  EMSC   FLORES SEA                   

P: 25SEP2023 156646     8.0S  121.0E 4.0-5.4 AAAAA  Flores Island area         

 

O: 24SEP2023 00:10:18   8.7S  116.2E ML=4.3  EMSC   LOMBOK REGION, INDONESIA     

P: 22SEP2023 156660     8.0S  117.0E 4.0-5.6 AAAAA  Sumbawa Island area        

 

O: 23SEP2023 22:21:31  12.5N  123.7E ML=4.1  EMSC   MASBATE REGION, PHILIPPINES  

P: 25SEP2023 156674    12.0N  124.0E 3.5-4.9 AAAAA  Luzon, Philippines         

 

CENTRAL AND SOUTH AMERICA

 

 

O: 23SEP2023 09:27:08  15.8N   95.1W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 23SEP2023 156682    16.0N   96.0W 3.5-5.1 AAAAA  Oaxaca, Mexico             

P: 27SEP2023 156667    15.0N   95.0W 3.5-5.5 BAAAA  Chiapas, Mexico            

 

O: 24SEP2023 04:42:09  16.1N   61.2W ML=4.1  EMSC   GUADELOUPE REGION, LEEWARD ISL

P: 25SEP2023 156672    16.0N   60.0W 3.0-5.0 AAAAA  Leeward Islands            

 

O: 24SEP2023 02:58:09  16.1N   97.1W ML=4.0  EMSC   OAXACA, MEXICO               

P: 23SEP2023 156682    16.0N   98.0W 3.5-5.4 AAAAA  Oaxaca, Mexico             

 

O: 24SEP2023 05:41:40  16.5S   72.5W ML=4.0  EMSC   NEAR COAST OF SOUTHERN PERU  

P: 24SEP2023 156852    16.0S   72.0W 4.0-5.8 AAAAA  So. Peru/Bolivia           

 

O: 23SEP2023 08:53:15  16.6N   94.9W ML=4.2  EMSC   OAXACA, MEXICO               

P: 25SEP2023 156667    17.0N   94.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 23SEP2023 12:54:28  18.7S   70.1W ML=4.2  EMSC   TARAPACA, CHILE              

P: 24SEP2023 156853    19.0S   69.0W 4.0-5.7 AAAAA  So. Peru/Bolivia           

 

O: 23SEP2023 18:00:56  20.1N   70.9W ML=3.4  EMSC   DOMINICAN REPUBLIC REGION

O: 24SEP2023 03:39:10  19.3N   67.4W MD=3.6  EMSC   PUERTO RICO REGION

O: 24SEP2023 01:24:27  18.8N   67.2W MD=3.2  EMSC   PUERTO RICO REGION           

P: 26SEP2023 156685    19.0N   68.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 23SEP2023 18:16:13  19.5N   65.5W MD=3.4  EMSC   PUERTO RICO REGION           

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

 

O: 23SEP2023 20:16:33  21.2S   68.7W mb=4.5  EMSC   ANTOFAGASTA, CHILE           

P: 23SEP2023 156860    21.0S   68.0W 4.0-6.2 AAAAA  Argentina                  

 

AFRICA AND EUROPE

 

O: 23SEP2023 16:52:15   5.9S   30.7E mb=4.6  EMSC   LAKE TANGANYIKA REGION, TANZAN

P: 14SEP2023 156386     6.0S   30.0E 3.0-4.4 CAAAA  Lake Victoria area         

 

O: 23SEP2023 10:54:53  31.4N    7.7W mb=3.5  EMSC   MOROCCO

O: 23SEP2023 15:15:28  31.4N    8.1W mb=3.0  EMSC   MOROCCO                      

P: 22SEP2023 156722    30.0N    8.0W 3.5-5.4 ABAAA  Morocco/Spain              

 

O: 24SEP2023 02:12:30  34.1N   26.1E mb=4.4  EMSC   CRETE, GREECE                

P: 23SEP2023 156715    34.0N   25.0E 3.0-4.8 AAAAA  Crete                      

P: 24SEP2023 156703    35.0N   26.0E 3.0-4.8 AAAAA  Aegean Sea                 

 

O: 23SEP2023 08:22:23  37.9N   36.4E mb=4.5  EMSC   CENTRAL TURKEY               

P: 22SEP2023 156761    38.0N   36.0E 3.5-5.2 AAAAA  Turkey                     

 

NEIC reported this earthquake of M 4.5 in Eastern Turkey was felt with intensity II-III in the area(s) of Eastern Turkey in Gaziantep (V), Polateli, Kilis (IV and Kayseri.

 

O: 24SEP2023 04:00:07  41.8N   45.0E mb=4.0  EMSC   GEORGIA (SAK'ART'VELO)       

P: 24SEP2023 156770    40.0N   44.0E 3.5-5.2 ABAAA  Caucasus/Caspian Sea       

 

O: 23SEP2023 17:01:35  42.9N   17.6E mb=4.0  EMSC   ADRIATIC SEA                 

P: 23SEP2023 156767    44.0N   18.0E 3.0-5.7 ABAAA  Adriatic Sea               

 

NEIC reported this earthquake of M 4.0 in Croatia was felt with intensity II-III in the area(s) of Croatia in Blato, Dubrovnik, Opuzen, Lumbarda, Orebic, Curzola, Zaton, Dubronik.

 

O: 23SEP2023 18:51:08  45.7N   26.6E ML=3.6  EMSC   ROMANIA                      

P: 23SEP2023 156798    46.0N   26.0E 3.0-5.3 AAAAA  Romania/NW Turkey          

 

O: 23SEP2023 22:03:17  38.6N   26.7W ML=3.4  EMSC   AZORES ISLANDS, PORTUGAL     

P: 15SEP2023 156523    40.0N   30.0W 4.0-5.7 CBCAA  No. Mid-Atlantic Ridge     

 

SOUTHWEST PACIFIC

 

O: 23SEP2023 09:10:04  10.6S  165.8E mb=4.5  EMSC   SANTA CRUZ ISLANDS           

P: 29SEP2023 156857    11.0S  166.0E 4.0-5.4 CAAAA  Vanuatu Islands            

 

O: 24SEP2023 05:55:44  25.7S  179.8E mb=4.4  EMSC   SOUTH OF FIJI ISLANDS        

P: 25SEP2023 156873    24.0S  179.0E 4.0-5.4 ABAAA  Tonga/Fiji                 

 

O: 23SEP2023 15:51:21  22.2S  170.5E Mw=5.1  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 24SEP2023 156865    23.0S  170.0E 4.0-5.4 AAAAA  Loyalty Islands            

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 24SEP2023 02:28:31  35.1S  179.8E ML=4.3  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 25SEP2023 156878    37.0S  177.0E 3.0-4.4 ABBAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

O: 24SEP2023 02:28:51  31.1N  141.9E mb=4.5  EMSC   IZU ISLANDS, JAPAN REGION

O: 24SEP2023 02:07:25  31.0N  141.9E mb=4.5  EMSC   IZU ISLANDS, JAPAN REGION    

P: 24SEP2023 156732    32.0N  142.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

O: 23SEP2023 15:01:13  35.7N  140.8E mb=4.4  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 24SEP2023 156733    36.0N  141.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

NEIC reported this earthquake of M 4.4 near Tokyo, Japan  was felt with intensity II-III in the area(s) of near Tokyo, Japan in Ibaraki Prefecture.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 23SEP2023 20:03:17  30.9N  115.0W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO

O: 23SEP2023 07:19:01  30.4N  114.9W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO      

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

 

O: 23SEP2023 10:53:36  31.3N  115.6W ML=3.0  EMSC   BAJA CALIFORNIA, MEXICO      

P: 29SEP2023 156741    31.9N  116.3W 2.5-4.6 CAAAA  So. California             

 

O: 24SEP2023 06:02:58  34.3N  119.9W ML=1.9  EMSC   SANTA BARBARA CHANNEL, CALIF.

P: 25SEP2023 156746    33.8N  119.7W 2.5-4.6 AAAAA  So. California             

 

O: 23SEP2023 11:59:56  37.3N  114.7W ML=2.3  EMSC   NEVADA                       

P: 26SEP2023 156707    37.3N  114.9W 2.5-4.6 BAAAA  Nevada area                

 

O: 23SEP2023 22:02:35  37.4N  121.8W MD=2.7  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 23SEP2023 156710    37.4N  121.3W 2.5-4.4 AAAAA  Central California         

 

O: 23SEP2023 07:26:09  37.5N  118.8W MD=2.8  EMSC   CENTRAL CALIFORNIA           

P: 23SEP2023 156706    37.5N  118.6W 2.5-4.4 AAAAA  California/Nevada area     

 

O: 23SEP2023 15:57:46  37.5N  121.2W ML=3.2  EMSC   NORTHERN CALIFORNIA          

P: 23SEP2023 156710    37.4N  121.3W 2.5-4.4 AAAAA  Central California         

 

O: 23SEP2023 23:31:14  39.5N  122.0W MD=2.9  EMSC   NORTHERN CALIFORNIA          

P: 30SEP2023 156790    40.3N  121.2W 2.5-4.5 CAAAA  Northern California        

 

O: 23SEP2023 15:14:22  39.7N  123.6W MD=2.3  EMSC   NORTHERN CALIFORNIA          

P: 26SEP2023 156712    39.6N  123.4W 2.5-4.6 BAAAA  Central California         

 

O: 24SEP2023 04:52:28  40.7N  124.2W MD=2.1  EMSC   NORTHERN CALIFORNIA          

P: 26SEP2023 156791    40.4N  124.2W 2.5-4.6 AAAAA  Off Coast of No. Calif     

 

 

ALASKA

 

O: 23SEP2023 20:38:13  54.9N  160.4W ML=3.6  EMSC   ALASKA PENINSULA             

P: 22SEP2023 156807    55.0N  160.9W 3.5-4.9 AAAAA  Alaska Peninsula           

 

O: 23SEP2023 21:52:38  55.4N  135.5W ML=3.4  EMSC   OFF COAST OF SOUTHEASTERN ALAS

P: 14SEP2023 156547    55.0N  135.0W 3.0-4.9 CAAAA  British Colombia           

P: 24SEP2023 156824    57.0N  138.0W 3.0-4.6 ABBAA  Southeast Alaska           

 

O: 23SEP2023 08:16:44  57.5N  152.6W ML=3.0  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 25SEP2023 156828    60.0N  153.5W 3.2-5.1 ACAAA  Central Alaska             

 

O: 23SEP2023 11:12:51  64.5N  147.0W ML=3.9  EMSC   CENTRAL ALASKA               

P: 19SEP2023 156569    63.3N  147.5W 3.2-5.0 BBAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.9 in Central Alaska was felt with intensity II-III in the area(s) of Central Alaska with IV in Eielson AFB and in Fairbanks, North Pole, Fort Wainwright, Delta Junction.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 24SEP2023 01:07:15  47.8N  122.9W ML=2.0  EMSC   PUGET SOUND REGION, WASHINGTON

P: 26SEP2023 156804    48.4N  123.2W 2.0-4.1 AAAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O: 23SEP2023 16:36:41  31.5N  103.6W ML=2.7  EMSC   WESTERN TEXAS                

P: 22SEP2023 156738    32.5N  104.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

O: 23SEP2023 21:50:19  32.7N  100.7W ML=2.6  EMSC   WESTERN TEXAS                

P: 23SEP2023 156738    31.6N  101.6W 2.0-4.1 ABAAA  SW U.S.A                   

 

O: 24SEP2023 00:48:32  37.4N  113.1W ML=2.6  EMSC   UTAH                          

P: 26SEP2023 156707    37.3N  114.9W 2.5-4.6 AABAA  Nevada area                

 

O: 23SEP2023 20:24:18  38.4N  112.8W ML=2.1  EMSC   UTAH                         

P: 25SEP2023 156763    38.3N  112.2W 2.0-4.3 AAAAA  Utah area                   

 

O: 23SEP2023 10:07:00  37.5N  104.7W ML=2.2  EMSC   COLORADO                     

P: 22SEP2023 156714    37.0N  105.9W 2.0-4.1 AAAAA  Colorado area              

 

EASTERN U.S./CANADA

 

O: 23SEP2023 12:47:42  34.5N   97.8W ML=2.0  EMSC   OKLAHOMA                     

P: 22SEP2023 156755    34.0N   97.0W 2.0-4.1 AAAAA  Southeast U.S.             

 

O: 23SEP2023 07:46:59  35.5N   96.8W ML=2.0  EMSC   OKLAHOMA                     

P: 22SEP2023 156757    35.0N   96.0W 2.0-4.3 AAAAA  Southern Plains            

 

O: 23SEP2023 20:56:55  36.7N   97.7W ML=2.0  EMSC   OKLAHOMA                     

P: 14SEP2023 156493    36.0N   97.0W 2.0-4.4 CAAAA  Southern Plains            

 

HAWAII

 

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

 

MODERATELY LARGE QUAKE IN BANDA SEA FELT IN NORTHERN AUSTRALIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 22, 2023

 

 

The strongest earthquake in the world today was an M 5.8 in the Banda Sea, Indonesia at a deep focus. NEIC reported it was felt in East Timor at Dili in Dili and Dare and in northern Territory, Australia with IV in Howard Springs, Katherine and II-III in Coonawarra, Darwin, Humpty Doo-MacMinns Lagoon. This is the largest earthquake within about 200 km of this epicenter since an M  5.9 on August 29, 2023, and an M 6.2 on May 24, 2023. A major M 7.6 hit near today's epicenter on January 9, 2023. This may be an aftershock of that mainshock. Forecast 156644 had expected enhanced seismicity in this region was likely to the north at the end of September, 2023.

 

O: 22SEP2023 14:59:17   7.1S  129.7E Mw=5.8  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 29SEP2023 156644     3.0S  129.0E 4.0-5.4 CCAAA  Ceram area                 

 

The largest earthquake in the U.S. or Canada today was an M 5.0 in the Alaska Peninsula, continuing the enhanced seismicity in that region at this time. NEIC reported it was felt with intensity V in King Cove, Alaska. This appears to be an aftershock of the M 5.4 which hit the region yesterday and was noted in this summary ini the previous issue as:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 5.4 in the Alaska Peninsula Alaska. NEIC reported it was felt with intensity V in Sand Point and King Cove and III in False Pass, Alaska. This is the strongest earthquake in the region of the Alaska Peninsula since an M 5.6 on August 3, 2023. At the time this summary noted:

 

 

"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. It is the second largest earthquake in this area since an M 6.1 on July 28 and July 29, 2020. In the past 15 years many of the strongest earthquakes in this region have occurred in mid- to late-July and early August, perhaps indicating a seasonal triggering component. All events in the region with M>=6 since 2008 have occurred in late July including an M 6.1 on July 16, 2011; an M 6.0 on July 19, 2018; an M 6.1 on July 28, 2020 and an M 7.2 on July 16, 2023." (August 3, 2023, September 21, 2023)

 

This event occurred near local solar noon and may have been promoted by strong tidal stresses which maximize near this hour. Forecast 156562 and 156807 had expected enhanced seismicity in this region in mid-September.

 

O: 22SEP2023 11:59:07  54.9N  160.4W ML=3.5  EMSC   ALASKA PENINSULA

O: 22SEP2023 09:04:41  55.0N  160.4W Mw=4.9  EMSC   ALASKA PENINSULA             

O: 22SEP2023 09:04:41  55.0N  160.4W Mw=5.0  ANSS   ALASKA PENINSULA             

P: 22SEP2023 156807    55.0N  160.9W 3.5-4.9 AAAAA  Alaska Peninsula           

 

An unusual earthquake of M 3.9 occurred today in central Texas. NEIC reported it was felt with maximum intensity IV in Hermleight, Snyder, Loraine and II-III in Roby, Colorado City, Roscoe and Midland among others. This is the strongest earthquake within about 150 km of this epicenter since an M 4.7 on February 16, 2023. At the time this summary noted:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 4.7 in Western Texas. NEIC reported it was felt with maximum intensity V in Texas at Roby and IV in Hermleigh, Rotan, Hamlin and II-III in Snyder, Colorado City, Roscoe, Sweetwater, Sylvester, Aspermont and as far as Austin and Dallas, Texas. This is not an area of western Texas where moderate earthquakes have been occurring (those about 200-300 km to the west of this). The last earthquake within about 200 km of today's epicenter in Western Texas with M>=4.7 was an M 5.4 on  December 16, 2022 about 200 km to the west of today's epicenter, but today's earthquake is the largest within about 150 km in at least 35 years." (February 16, 2023)

 

Today's event occurred near local solar noon and may have been promoted by tidal stresses. Forecast 156738 had expected today's event was likely in this area around September 23.

 

O: 22SEP2023 20:15:58  32.7N  100.7W ML=3.9  ANSS   WESTERN TEXAS                

O: 22SEP2023 20:15:58  32.7N  100.7W ML=3.8  EMSC   WESTERN TEXAS                

P: 23SEP2023 156738    31.6N  101.6W 2.0-4.1 ABAAA  SW U.S.A                   

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: 22SEP2023 13:53:51  36.7N   71.0E mb=4.2  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 22SEP2023 156717    37.0N   71.0E 3.8-5.2 AAAAA  Hindu Kush/Pakistan        

 

O: 22SEP2023 23:39:31  37.5N   73.2E mb=4.3  EMSC   TAJIKISTAN                   

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

 

O: 22SEP2023 19:31:28  51.4N  100.4E mb=4.3  EMSC   RUSSIA-MONGOLIA BORDER REGION

P: 14SEP2023 156514    46.0N   96.0E 4.0-5.7 CCCAA  Mongolia                   

 

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

 

INDONESIA AND PHILIPPINES

 

O: 23SEP2023 02:20:16   5.4S  131.3E ML=4.3  EMSC   BANDA SEA                    

P: 26SEP2023 156661     4.0S  134.0E 4.0-5.4 BBCAA  West Irian, PNG            

 

O: 22SEP2023 15:12:51   6.5S  121.3E ML=4.0  EMSC   FLORES SEA                    

P: 25SEP2023 156646     8.0S  121.0E 4.0-5.4 BBAAA  Flores Island area         

 

O: 22SEP2023 14:59:17   7.1S  129.7E Mw=5.8  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 29SEP2023 156644     3.0S  129.0E 4.0-5.4 CCAAA  Ceram area                  

 

O: 22SEP2023 11:01:58  11.4S  117.5E ML=4.1  EMSC   SOUTH OF SUMBAWA, INDONESIA  

P: 22SEP2023 156660     8.0S  117.0E 4.0-5.6 ACAAA  Sumbawa Island area        

 

CENTRAL AND SOUTH AMERICA

 

O: 23SEP2023 05:06:17  14.5N   94.1W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 21SEP2023 156666    15.0N   94.0W 3.5-5.6 AAAAA  Chiapas, Mexico            

 

O: 22SEP2023 21:17:51  14.6S   75.5W ML=4.2  EMSC   NEAR COAST OF CENTRAL PERU   

P: 26SEP2023 156845    14.0S   76.0W 4.0-5.8 BAAAA  Central Peru               

 

O: 22SEP2023 10:14:55  10.1S   72.9W mb=4.6  EMSC   CENTRAL PERU                 

P: 24SEP2023 156844    10.0S   75.0W 3.5-5.1 AABAA  Brazil                     

 

O: 22SEP2023 10:50:17  15.0N   94.2W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 21SEP2023 156666    15.0N   94.0W 3.5-5.6 AAAAA  Chiapas, Mexico            

 

O: 22SEP2023 12:35:59  17.0N  100.9W ML=4.3  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 25SEP2023 156677    18.0N  101.0W 3.5-5.2 BAAAA  Michoacan, Mexico          

 

O: 23SEP2023 03:05:33  18.2N   76.6W ML=3.0  EMSC   JAMAICA REGION               

P: 23SEP2023 156665    19.0N   81.0W 3.5-5.1 AACAA  Caribbean Sea              

 

NEIC reported this earthquake of M 3.0 in Jamaica was felt with intensity II-III in the area(s) of Jamaica in Hope Bay, Portland, Staony Hill, Constant Spring, Half Way Tree, Kingston, Saint Andrew.

 

O: 23SEP2023 04:57:12  18.8N  107.2W ML=4.3  EMSC   OFF COAST OF JALISCO, MEXICO 

P: 22SEP2023 156668    19.0N  107.0W 3.5-5.4 AAAAA  Coast of Jalisco, Mexico   

 

O: 22SEP2023 09:05:40  19.3N  121.0E ML=4.2  EMSC   BABUYAN ISL REGION, PHILIPPINE

P: 22SEP2023 156699    20.0N  122.0E 4.0-5.4 AAAAA  Taiwan                     

 

O: 22SEP2023 20:19:48  22.2S   68.7W ML=4.2  EMSC   ANTOFAGASTA, CHILE            

P: 23SEP2023 156860    21.0S   68.0W 4.0-6.2 ABAAA  Argentina                  

 

NEIC reported this earthquake of M 4.4 in Tarapaca, Chile was felt with intensity II-III in the area(s) of Tarapaca, Chile in Iquique.

 

O: 22SEP2023 14:47:18  28.2S   70.4W ML=4.0  EMSC   ATACAMA, CHILE               

P: 21SEP2023 156863    29.0S   70.0W 4.0-5.6 AAAAA  Coast Central Chile        

 

AFRICA AND EUROPE

 

O: 22SEP2023 13:17:40  72.3N   15.3E mb=3.0  EMSC   NORWEGIAN SEA                

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

 

SOUTHWEST PACIFIC

 

O: 22SEP2023 16:19:32  14.9S  166.8E Mw=5.4  EMSC   VANUATU                      

P: 22SEP2023 156858    14.0S  167.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

O: 22SEP2023 22:13:50  18.9S  174.3W mb=4.9  EMSC   TONGA                        

P: 23SEP2023 156855    19.0S  173.0W 4.0-5.8 AAAAA  Tonga Islands              

 

NEIC reported this earthquake of M 4.9 in Tonga was felt with intensity II-III in the area(s) of Tonga in Neiafu, Vava'u.

 

O: 22SEP2023 12:22:00  24.6S  179.9E mb=4.3  EMSC   SOUTH OF FIJI ISLANDS        

O: 22SEP2023 08:20:58  25.3S  179.8W mb=4.8  EMSC   SOUTH OF FIJI ISLANDS        

P: 25SEP2023 156873    24.0S  179.0E 4.0-5.4 BAAAA  Tonga/Fiji                 

P: 27SEP2023 156872    24.0S  178.0W 4.0-5.4 BBBAA  Tonga Islands              

 

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

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

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: 22SEP2023 16:33:14  30.9N  142.1E mb=5.0  EMSC   IZU ISLANDS, JAPAN REGION    

P: 24SEP2023 156732    32.0N  142.0E 4.0-5.4 ABAAA  Off East Coast Honshu      

 

O: 22SEP2023 19:13:40  43.3N  139.0E mb=4.1  EMSC   EASTERN SEA OF JAPAN         

P: 18SEP2023 156508    43.0N  142.0E 3.5-5.5 BABAA  Hokkaido, Japan            

 

O: 22SEP2023 23:31:24  44.9N  144.3E mb=4.0  EMSC   HOKKAIDO, JAPAN REGION       

P: 20SEP2023 156535    45.0N  146.0E 3.5-5.4 AAAAA  So. Kurils                 

P: 21SEP2023 156800    45.0N  146.0E 3.5-5.4 AAAAA  So. Kurils                 

 

O: 23SEP2023 01:49:14  50.5N  156.7E mb=4.5  EMSC   KURIL ISLANDS                

P: 24SEP2023 156816    50.0N  156.0E 4.0-6.1 AAAAA  Kamchatka                  

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 22SEP2023 10:22:49  31.0N  116.5W ML=3.6  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 26SEP2023 156743    32.1N  116.4W 2.5-4.6 BBAAA  So. California             

 

O: 22SEP2023 15:08:32  32.3N  115.3W ML=2.0  EMSC   BAJA CALIFORNIA, MEXICO      

P: 24SEP2023 156744    32.9N  115.6W 2.5-4.7 AAAAA  So. California             

 

O: 22SEP2023 20:38:41  32.3N  116.3W ML=2.3  EMSC   BAJA CALIFORNIA, MEXICO      

P: 22SEP2023 156743    32.6N  116.1W 2.5-4.6 AAAAA  So. California             

 

O: 22SEP2023 13:42:38  35.8N  117.6W ML=2.2  EMSC   SOUTHERN CALIFORNIA

O: 22SEP2023 23:14:03  35.6N  117.4W ML=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 23SEP2023 156750    35.8N  117.6W 2.5-4.4 AAAAA  So. California             

 

O: 23SEP2023 06:59:24  37.3N  122.1W MD=2.1  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 22SEP2023 18:03:14  37.3N  122.1W MD=2.7  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 23SEP2023 156710    37.4N  121.3W 2.5-4.4 AAAAA  Central California         

P: 24SEP2023 156710    38.0N  122.3W 2.5-4.4 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.8 in San Francisco, California was felt with intensity II-III in the area(s) of San Francisco, California in Cupertino, Los Altos, Sunnyvale, Saratoga, San Jose, Mountain View among others.

 

O: 22SEP2023 09:50:13  40.4N  124.6W MD=2.4  EMSC   OFFSHORE NORTHERN CALIFORNIA 

O: 22SEP2023 08:11:07  40.4N  124.4W MD=2.1  EMSC   OFFSHORE NORTHERN CALIFORNIA

P: 26SEP2023 156791    40.4N  124.2W 2.5-4.6 BAAAA  Off Coast of No. Calif     

 

ALASKA

 

O: 22SEP2023 20:06:30  51.5N  179.2W ML=3.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24SEP2023 156809    50.8N  179.5W 3.5-5.3 AAAAA  Andreanoff Isls, Aleutians 

 

O: 22SEP2023 11:59:07  54.9N  160.4W ML=3.5  EMSC   ALASKA PENINSULA

O: 22SEP2023 09:04:41  55.0N  160.4W Mw=4.9  EMSC   ALASKA PENINSULA             

P: 22SEP2023 156807    55.0N  160.9W 3.5-4.9 AAAAA  Alaska Peninsula           

 

O: 22SEP2023 21:54:59  57.1N  154.5W ML=3.4  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 27SEP2023 156807    54.7N  156.9W 3.5-4.9 BCBAA  Alaska Peninsula           

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 22SEP2023 05:46:43  50.6N  130.4W MB=3.1  ECAN of Port Hardy, BC              

P: 22SEP2023 156812    50.7N  130.5W 3.0-4.9 AAAAA  British Colombia            

 

ROCKY MOUNTAINS REGION

 

O: 23SEP2023 00:48:19  31.6N  104.4W ML=2.6  EMSC   WESTERN TEXAS                

O: 22SEP2023 12:18:31  32.3N  103.3W ML=3.5  EMSC   NEW MEXICO

P: 22SEP2023 156738    32.5N  104.6W 2.0-4.1 AAAAA  SW U.S.A                    

 

O: 22SEP2023 20:15:58  32.7N  100.7W ML=3.8  EMSC   WESTERN TEXAS                

P: 23SEP2023 156738    31.6N  101.6W 2.0-4.1 ABAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 21SEP2023 23:00:06  49.1N   66.8W MB=1.8  ECAN of Cap-Chat, QC                

P: 28SEP2023 156772    49.0N   66.0W 2.0-4.3 CAAAA  E. of Maine                

 

O: 22SEP2023 20:58:44  41.7N   81.0W ML=2.1  EMSC   OHIO                         

O: 21SEP2023 21:28:55  41.8N   81.0W MB=2.7  ECAN of Cleveland, OH                

P: 26SEP2023 156794    41.8N   81.4W 2.0-3.9 BAAAA  Ohio/Lake Erie             

 

O: 22SEP2023 09:42:08  29.1N   97.9W ML=2.2  EMSC   SOUTHERN TEXAS               

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

 

O: 22SEP2023 20:12:24  34.1N   97.4W ML=2.5  EMSC   OKLAHOMA

O: 22SEP2023 10:46:38  35.5N   96.8W ML=3.2  EMSC   OKLAHOMA

O: 22SEP2023 19:24:43  34.1N   97.4W ML=2.4  EMSC   OKLAHOMA                     

P: 22SEP2023 156755    34.0N   97.0W 2.0-4.1 AAAAA  Southeast U.S.             

 

NEIC reported this earthquake of M 3.0 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma in Prague.

An M 3.2 was also felt in Oklahoma today with maximum intensity IV in Prague and II-III in Sparks, Shawnee, Meeker, Chandler, Stroud and Oklahoma City.

The M 2.8 was reported felt with intensity II in Morrison, Oklahoma.

 

O: 22SEP2023 18:51:55  35.5N   96.8W ML=2.8  EMSC   OKLAHOMA                     

P: 22SEP2023 156757    35.0N   96.0W 2.0-4.3 AAAAA  Southern Plains            

 

O: 22SEP2023 08:19:17  36.4N   96.9W ML=2.7  EMSC   OKLAHOMA

O: 22SEP2023 08:56:47  36.4N   96.9W ML=2.8  EMSC   OKLAHOMA                     

P: 29SEP2023 156756    36.0N   97.0W 2.0-4.1 CAAAA  Southern Plains            

 

HAWAII

 

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

 

STRONG EARTHQUAKE IN NORTHERN VANUATU

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 21, 2023

 

 

The strongest earthquake of the day in the world was an M 6.1 in northern Vanuatu. NEIC reported it was felt with intensity IV in Luganville, Sanma, Vanuatu. This may be an aftershock of an M 6.5 which occurred on August 16, 2023. At the time this summary noted in this regard:

 

 

"The strongest earthquake in the world today was an M 6.5 in northern Vanuatu. The mainshock was reported by NEIC to have been felt with intensity VII in Vanuatu at Sola Torba and IV in Sanma at Port Olry and Luganville and possibly in the Solomon Islands and New South Wales, Australia. The mainshock was preceded by an M 5.2 regional foreshock several hours earlier. That event was

felt with intensity III in Luganville, Sanma, Vanuatu. An aftershock of M 4.3 was felt with intensity IV in Port Olry, Sanma, Vanuatu. The mainshock within minutes of local solar midnight and most likely was promoted by tidal stresses with the new moon which was completed within hours of the occurrence of this earthquake.

 

...

 

Today's event of M 6.5 is the largest in northern Vanuatu since an M 7.0 about 150 km south of this epicenter on January 8, 2023. The last within 100 km at this magnitude level was an M 6.6 on January 15, 2019. (August 16, 2022)

 

Forecast 156858 had expected today's event within about 25 km was likely around September 22.

 

O: 21SEP2023 21:11:52  14.0S  167.2E Mw=6.1  EMSC   VANUATU                      

P: 22SEP2023 156858    14.0S  167.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

Moderately large events of M 5.7 also occurred today in the Kermadec Islands and in the Izu Islands of Japan. These occurred in areas where moderately strong activity has been occurring in recent days.

 

The earthquake of M 5.7 in the Izu Islands, Japan was followed by an M 4.7 three hours later. follows a series of such events in the area including an M 5.8 on September 19. At the time this summary noted:

 

 

"An M 5.8 also occurred in the Izu Islands south of southeastern Honshu, Japan today. A similar M 5.8 occurred on February 5, 2023 and an M 6.3 in the Izu Islands was recorded on January 16, 2023. At the time of that event this summary noted:

 

"The strongest earthquake in the world today was an M 6.3 in the Izu Islands, Japan. NEIC reported it was felt with intensity II-III in Japan at Shizuoka, Kanagawa, Tokyo, Chiba, Fukushima and Okinawa Prefectures. This follows an M 5.2 in the area yesterday. In the previous summary it had been noted in this regard:

 

"The strongest earthquake in the world today was an M 5.2 in the Izu Islands of Southeastern Japan. Today's event was reported by JMA to have been lightly felt in southeastern Honshu, Japan. The last earthquake in the Izu Islands of  significantly larger magnitude in this area of Izu Islands occurred on August 4, 2022 with M 5.7 after similar activity on July 31, 2022." (January 16, 2023, September 19, 2023)

 

Forecast 156732 had expected today's event within about 100 km was likely around September 24.

 

O: 22SEP2023 00:46:51  31.0N  142.0E mb=4.7  EMSC   IZU ISLANDS, JAPAN REGION

O: 21SEP2023 21:22:13  31.0N  141.8E Mw=5.7  EMSC   IZU ISLANDS, JAPAN REGION    

P: 24SEP2023 156732    32.0N  142.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

The M 5.7 in the Kermadec Islands is likely a regional  aftershock of the M 6.6

south of this on September 8, 2023. It was not felt in this remote area. At the time of the September 8 event this summary noted:

 

 

"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." (September 9, 2023)

 

Forecast 156877 had expected today's event was likely within about 100 km around

September 22.

 

O: 21SEP2023 15:20:30  30.7S  178.0W Mw=5.7  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 22SEP2023 156877    30.0S  179.0W 4.0-5.6 AAAAA  No. Kermadec Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in eastern Greenland. It was not reported felt in this remote area. This is the strongest earthquake in eastern Greenland within about 300 km of this epicenter since an  M 5.2 north of this epicenter on November 23, 2021. Similar events in the region occurred on January 16, 2018 with M 4.7 and August 15, 2008 with M 4.8.

 

Forecast 156842 had expected enhanced seismicity in this region was likely around September 22.

 

O: 21SEP2023 22:41:40  79.6N   18.4W mb=4.7  EMSC   EASTERN GREENLAND            

O: 21SEP2023 22:41:40  79.6N   18.6W mb=4.7  ANSS   eastern Greenland"           

P: 22SEP2023 156842    71.0N    8.0W 3.5-5.2 ACAAA  Jan Mayen Isl. area        

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: 22SEP2023 02:21:45  36.6N   71.0E mb=4.4  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 22SEP2023 156717    37.0N   71.0E 3.8-5.2 AAAAA  Hindu Kush/Pakistan        

 

O: 21SEP2023 14:43:08  38.5N   45.4E mb=4.4  EMSC   NORTHWESTERN IRAN            

P: 17SEP2023 156496    38.0N   44.0E 3.5-5.0 BABAA  Turkey                     

 

O: 21SEP2023 10:56:01  40.4N   77.4E mb=4.4  EMSC   SOUTHERN XINJIANG, CHINA     

P: 17SEP2023 156512    40.0N   77.0E 4.0-5.4 BAAAA  Kirgizstan/Xinjiang        

 

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

 

INDONESIA AND PHILIPPINES

 

O: 21SEP2023 15:41:36   0.4N  120.2E ML=4.0  EMSC   MINAHASA, SULAWESI, INDONESIA

P: 21SEP2023 156659     1.0S  120.0E 4.0-5.5 ABAAA  Sulawesi area              

 

O: 21SEP2023 22:55:23   2.2S  119.2E ML=4.2  EMSC   SULAWESI, INDONESIA          

P: 21SEP2023 156659     1.0S  120.0E 4.0-5.5 ABAAA  Sulawesi area              

 

O: 21SEP2023 13:55:27   2.4N  128.5E ML=4.0  EMSC   HALMAHERA, INDONESIA         

P: 21SEP2023 156634     4.0N  129.0E 4.0-5.4 ABAAA  Halmahera                  

 

O: 21SEP2023 15:37:56   2.8S  130.0E ML=4.2  EMSC   SERAM, INDONESIA             

P: 23SEP2023 156661     1.0S  133.0E 4.0-5.5 ABCAA  West Irian, PNG            

 

O: 22SEP2023 01:11:44   3.8S  151.9E mb=5.0  EMSC   NEW IRELAND REGION, P.N.G.   

P: 16SEP2023 156389     4.0S  151.0E 4.0-5.4 CAAAA  New Ireland                

 

O: 21SEP2023 18:23:23   6.2S  122.6E mb=4.7  EMSC   FLORES SEA                    

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

 

O: 21SEP2023 18:13:37   6.3S  103.7E mb=4.5  EMSC   SOUTHWEST OF SUMATRA, INDONESI

P: 21SEP2023 156657     7.0S  104.0E 4.0-5.4 AAAAA  So. of Sumatera             

 

O: 22SEP2023 02:18:14   8.3S  119.7E mb=4.4  EMSC   FLORES REGION, INDONESIA     

O: 21SEP2023 16:43:07   8.6S  118.4E mb=4.5  EMSC   SUMBAWA REGION, INDONESIA

P: 21SEP2023 156660     8.0S  119.0E 4.0-5.4 AAAAA  Sumbawa Island area        

 

O: 21SEP2023 08:22:38  10.3N  126.2E ML=4.2  EMSC   PHILIPPINE ISLANDS REGION    

O: 21SEP2023 09:29:51  10.9N  126.6E ML=4.0  EMSC   PHILIPPINE ISLANDS REGION

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

P: 21SEP2023 156674    10.0N  125.0E 3.5-5.1 AABAA  Luzon, Philippines         

 

O: 21SEP2023 09:48:24  13.8N  144.7E mb=4.5  EMSC   GUAM REGION                  

O: 21SEP2023 09:48:24  13.8N  144.7E mb=5.0  ANSS   GUAM REGION                  

P: 19SEP2023 156420    14.0N  146.0E 4.0-5.4 AAAAA  So. Marianas/Guam          

P: 23SEP2023 156686    13.0N  143.0E 4.0-5.4 AAAAA  So. Marianas/Guam          

 

NEIC reported this earthquake of M 5.0 in Guam was felt with intensity III-IV in the area(s) of Guam in Tamuning, Barrigada, Hagatna, Asan, Sinajana, Yigo, Yona, Santa Rita, and Mangilao with lesser shaking in Dededo, Guam.

 

O: 22SEP2023 00:45:49  14.9N  108.2E mb=4.6  EMSC   VIETNAM                      

 

O: 22SEP2023 03:18:12   6.2N  123.8E mb=4.4  EMSC   MORO GULF, MINDANAO, PHILIPPINES

 

CENTRAL AND SOUTH AMERICA

 

O: 21SEP2023 20:55:59   5.7S   76.7W ML=4.0  EMSC   NORTHERN PERU                

P: 29SEP2023 156653     6.0S   76.0W 4.0-5.9 CAAAA  No. Peru                   

 

O: 22SEP2023 05:07:15  11.8N   87.2W mb=4.9  EMSC   NEAR COAST OF NICARAGUA      

P: 15SEP2023 156414    12.0N   87.0W 3.5-5.1 CAAAA  Nicaragua                  

 

O: 22SEP2023 01:03:09  12.7S   76.1W ML=4.3  EMSC   NEAR COAST OF CENTRAL PERU   

P: 17SEP2023 156581    14.0S   76.0W 4.0-5.9 BBAAA  Central Peru               

P: 26SEP2023 156845    14.0S   76.0W 4.0-5.8 BBAAA  Central Peru               

 

O: 22SEP2023 00:15:28   8.1S   74.5W ML=4.4  EMSC   CENTRAL PERU                 

O: 22SEP2023 02:11:56   8.8S   74.4W mb=4.9  EMSC   CENTRAL PERU                 

P: 23SEP2023 156642     8.0S   74.0W 3.5-5.1 AAAAA  Brazil                     

 

O: 21SEP2023 20:33:52  16.5N   96.0W ML=4.0  EMSC   OAXACA, MEXICO

O: 21SEP2023 23:13:50  16.6N   94.9W ML=4.0  EMSC   OAXACA, MEXICO

O: 21SEP2023 19:29:12  17.0N   94.7W ML=4.0  EMSC   OAXACA, MEXICO

O: 21SEP2023 18:41:57  17.7N   95.6W ML=4.4  EMSC   VERACRUZ, MEXICO

O: 21SEP2023 16:33:31  15.9N   95.1W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 20SEP2023 156417    16.0N   96.0W 3.5-5.2 AAAAA  Oaxaca, Mexico             

 

O: 21SEP2023 13:50:27  16.9N   98.5W ML=4.1  EMSC   GUERRERO, MEXICO             

P: 23SEP2023 156682    16.0N   98.0W 3.5-5.4 AAAAA  Oaxaca, Mexico             

 

O: 21SEP2023 23:27:53  18.1N   68.9W ML=3.2  EMSC   DOMINICAN REPUBLIC REGION    

P: 26SEP2023 156685    19.0N   68.0W 3.4-5.1 BAAAA  Puerto Rico                

 

O: 22SEP2023 00:31:12  18.1N   76.6W mb=4.3  EMSC   JAMAICA REGION               

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

P: 23SEP2023 156665    19.0N   81.0W 3.5-5.1 AACAA  Caribbean Sea              

 

NEIC reported this earthquake of M 4.3 in Jamaica was felt with intensity IV-V   in the area(s) of Jamaica in Constant Spring, Mona, Kingston, Half Way Tree, Above Rocks, Trinity Ville, Port Antonio, Portland, Portmore, Spanish Town, Saint Catherine Gayle, Saint Mary among others.

 

O: 21SEP2023 07:29:42  18.6N   70.7W ML=3.1  EMSC   DOMINICAN REPUBLIC           

P: 20SEP2023 156422    20.0N   71.0W 3.0-4.6 ABAAA  Bahamas/No. Caribbean      

 

O: 21SEP2023 11:19:00  18.9N   67.3W MD=3.0  EMSC   PUERTO RICO REGION           

P: 22SEP2023 156684    18.0N   68.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 21SEP2023 22:49:20  21.8S   67.2W Mw=4.3  EMSC   POTOSI, BOLIVIA              

P: 20SEP2023 156591    21.0S   68.0W 4.0-6.2 AAAAA  Argentina                  

 

O: 21SEP2023 10:09:26  23.2S   66.8W mb=4.5  EMSC   JUJUY, ARGENTINA             

P: 22SEP2023 156861    23.0S   67.0W 4.0-5.6 AAAAA  Argentina                   

 

 

AFRICA AND EUROPE

 

O: 22SEP2023 01:08:06  31.0N    8.5W ML=3.6  EMSC   MOROCCO                      

P: 22SEP2023 156722    30.0N    8.0W 3.5-5.4 AAAAA  Morocco/Spain              

 

O: 22SEP2023 05:27:34  70.0N   12.0E ML=2.6  EMSC   NORWEGIAN SEA                

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

 

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

 

SOUTHWEST PACIFIC

 

O: 21SEP2023 21:11:52  14.0S  167.2E Mw=6.1  EMSC   VANUATU                      

P: 22SEP2023 156858    14.0S  167.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 21SEP2023 15:20:30  30.7S  178.0W Mw=5.7  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 22SEP2023 156877    30.0S  179.0W 4.0-5.6 AAAAA  No. Kermadec Islands       

 

JAPAN AND KURIL ISLANDS

 

O: 22SEP2023 00:46:51  31.0N  142.0E mb=4.7  EMSC   IZU ISLANDS, JAPAN REGION

O: 21SEP2023 21:22:13  31.0N  141.8E Mw=5.7  EMSC   IZU ISLANDS, JAPAN REGION    

P: 24SEP2023 156732    32.0N  142.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

O: 21SEP2023 12:54:57  49.4N  155.6E mb=4.5  EMSC   KURIL ISLANDS                

P: 24SEP2023 156816    50.0N  156.0E 4.0-6.1 BAAAA  Kamchatka                  

P: 25SEP2023 156784    49.0N  155.0E 3.5-5.5 BAAAA  NE Pacific                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 22SEP2023 05:33:43  32.1N  115.1W ML=2.0  EMSC   BAJA CALIFORNIA, MEXICO      

P: 24SEP2023 156744    32.9N  115.6W 2.5-4.7 AAAAA  So. California             

 

O: 21SEP2023 21:26:10  34.0N  116.9W ML=2.3  EMSC   SOUTHERN CALIFORNIA          

P: 23SEP2023 156745    33.4N  116.7W 2.5-4.6 AAAAA  So. California             

 

O: 21SEP2023 07:05:36  35.4N  118.6W ML=2.0  EMSC   CENTRAL CALIFORNIA           

P: 23SEP2023 156749    35.4N  118.5W 2.5-4.6 AAAAA  So. California             

 

O: 21SEP2023 07:14:07  37.3N  122.1W MD=2.8  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 23SEP2023 156710    37.4N  121.3W 2.5-4.4 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.9 in San Francisco Bay, California was felt with intensity II-III in the area(s) of San Francisco Bay, Californian Cupertino, Los Altos, Sunnyvale, San Jose, Saratoga, Mountain View, Santa Clara among others.

 

O: 22SEP2023 03:06:57  37.6N  118.5W MD=2.2  EMSC   CENTRAL CALIFORNIA

O: 21SEP2023 15:05:14  37.6N  118.9W MD=2.2  EMSC   LONG VALLEY AREA, CALIFORNIA 

P: 23SEP2023 156706    37.5N  118.6W 2.5-4.4 AAAAA  California/Nevada area     

 

O: 21SEP2023 19:57:42  39.7N  120.6W MD=2.4  EMSC   NORTHERN CALIFORNIA          

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

 

O: 22SEP2023 00:54:46  40.7N  123.9W MD=2.4  EMSC   NORTHERN CALIFORNIA          

P: 27SEP2023 156789    40.0N  123.0W 2.5-4.7 BAAAA  Northern California        

 

ALASKA

 

O: 22SEP2023 06:34:21  55.0N  156.3W ML=3.6  EMSC   SOUTH OF ALASKA              

P: 27SEP2023 156807    54.7N  156.9W 3.5-4.9 BAAAA  Alaska Peninsula           

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 21SEP2023 23:42:02  47.2N  122.9W ML=2.0  EMSC   PUGET SOUND REGION, WASHINGTON

P: 22SEP2023 156804    47.5N  121.8W 2.0-4.1 AAAAA  Washington state, U.S.      

P: 24SEP2023 156804    46.9N  122.0W 2.0-3.9 BAAAA  Washington state, U.S.     

 

O: 21SEP2023 07:26:13  54.5N  118.5W MB=3.1  ECAN of Grande Prairie, AB  

O: 21SEP2023 07:26:13  54.5N  118.5W ML=3.1  EMSC   ALBERTA, CANADA              

P: 16SEP2023 156542    56.0N  117.0W 2.0-4.1 BBAAA  Alberta                    

 

ROCKY MOUNTAINS REGION

 

O: 21SEP2023 16:53:31  32.0N  103.8W ML=2.3  EMSC   WESTERN TEXAS

O: 21SEP2023 19:35:48  32.0N  103.8W ML=2.6  EMSC   WESTERN TEXAS                

P: 22SEP2023 156738    32.5N  104.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 21SEP2023 08:39:09  47.4N   70.4W MB=0.5  ECAN of Baie-Saint-Paul, QC         

P: 22SEP2023 156778    47.0N   70.0W 2.0-4.1 AAAAA  Maine                      

 

O: 21SEP2023 22:41:40  79.6N   18.4W mb=4.7  EMSC   EASTERN GREENLAND            

O: 21SEP2023 22:41:40  79.6N   18.6W mb=4.7  ANSS   eastern Greenland"           

P: 22SEP2023 156842    71.0N    8.0W 3.5-5.2 ACAAA  Jan Mayen Isl. area        

 

O: 21SEP2023 10:59:21  34.5N   97.8W ML=2.2  EMSC   OKLAHOMA

O: 21SEP2023 11:15:30  34.5N   97.8W ML=2.1  EMSC   OKLAHOMA

O: 21SEP2023 12:48:05  34.5N   97.8W ML=2.0  EMSC   OKLAHOMA

O: 21SEP2023 13:57:06  34.5N   97.8W ML=2.0  EMSC   OKLAHOMA

O: 21SEP2023 21:29:07  34.5N   97.8W ML=3.0  EMSC   OKLAHOMA

O: 21SEP2023 07:24:26  34.5N   97.8W ML=3.0  EMSC   OKLAHOMA                     

P: 22SEP2023 156755    34.0N   97.0W 2.0-4.1 AAAAA  Southeast U.S.             

 

NEIC reported this earthquake of M 3.0 in Oklahoma was felt with intensity V in the area(s) of  Duncan, Oklahoma.

 

O: 21SEP2023 12:42:46  35.1N   95.5W ML=2.4  EMSC   OKLAHOMA                     

P: 22SEP2023 156757    35.0N   96.0W 2.0-4.3 AAAAA  Southern Plains            

 

O: 21SEP2023 11:55:07  64.0N   88.1W MB=3.4  ECAN of Chesterfield Inlet, NU  

O: 21SEP2023 11:55:07  64.0N   88.1W ML=3.4  EMSC   NUNAVUT, CANADA              

P: 26SEP2023 156837    65.0N   86.0W 2.5-3.9 BAAAA  Nunavit/Hudson Bay, Canada 

 

HAWAII

 

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

 

STRONG QUAKES IN EAST PACIFIC RISE; PRINCE EDWARD ISLANDS

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 20, 2023

 

 

The largest earthquake in the world today was an M 6.0 in the northern East Pacific Rise south of Oaxaca, Mexico where was reported felt with intensity II. It was followed by a strong aftershock of M 5.7 and a moderate event of M 4.6 and preceded by an M 4.6 foreshock and an M 5.2 foreshock seconds before the mainshock. The last earthquake of M>=6 within about 200 km of today's epicenters occurred as an M 6.1 on March 22, 2020 and a similar event of M 6.0-6.1 on  September 11, 2013. The only event of M>=6.0-6.1 in the area in the past 35 years was an M 6.33 on August 15, 1997. At the time of the event of March 22, 2020, this summary noted:

 

"The strongest earthquakes in the world today were an M 6.1 in the Central East Pacific Rise and an M 5.6 in the Central Mid-Atlantic Ridge. Neither of these were reported felt in these remote areas. The event in the Central East Pacific Rise is the largest within about 250 km of that epicenter since an M 6.1 on September 11, 2013 and a similar M 6.1 on August 4, 2007. The maximum sized earthquakes in the region in the past 30 years have been about M 6.1." (March 22, 2020)

 

Forecast 156391 had expected today's activity within about 100 km of these epicenters was likely around September 16. This activity is at the fifth node (72 degrees) from the M 7.7 in the Loyalty Islands of May 19, 2023 and near 103 degrees from the M 6.8 in Morocco of September 8, 2023 and may have been promoted by energy from those sources.

 

 

O: 20SEP2023 14:46:00   4.5S  105.8W Mw=6.0  EMSC   CENTRAL EAST PACIFIC RISE

O: 20SEP2023 15:03:37   4.6S  105.9W Mw=5.7  EMSC   CENTRAL EAST PACIFIC RISE

O: 20SEP2023 15:28:25   4.6S  106.2W mb=4.6  EMSC   CENTRAL EAST PACIFIC RISE

O: 20SEP2023 14:45:29   4.5S  105.7W mb=5.2  EMSC   CENTRAL EAST PACIFIC RISE    

P: 16SEP2023 156391     5.0S  105.0W 4.0-5.5 BAAAA  No. East Pacific Rise      

 

An M 5.8 in the Prince Edward Island region of the South Indian Ocean also occurred today. It was not reported felt in this remote area. This epicenter is near the antipode of the M 6.0 in Vancouver, Canada of September 17, 2023 and may have been promoted by antipodal energy associated with that event. An earthquake of M 5.9 hit the Prince Edward Islands about 300 km east of today's epicenter on August 14, 2023. At the time this summary noted:

 

"An M 5.9 also occurred in the Prince Edward Islands of the south Indian Ocean. It was not reported felt in this remote area. Several hours earlier an M 4.9 occurred in the Southeast Indian Ridge. Neither of these event was reported felt. Both events occurred about an hour after local solar noon and may have been promoted by strong tidal stresses associated with the new moon of August 16. As noted in this and previous issues of this summary this event in the Prince Edward Islands is near the longitude of maximum tidal stress with today's new moon (see above).

 

The earthquake in the Prince Edward Islands is a aftershock of an M 6.8 on May 21, 2023. At the time this summary noted:

 

"The strongest earthquake in the world today was an M 6.8 in the Prince Edward Islands of the South Indian Ocean. It was not reported felt in this remote area.

This is the strongest earthquake in the Prince Edward Islands region within about  300 km of these epicenters in at least 35 years. The largest previous earthquake in this time frame in this area was an M 6.3 exactly 25 years ago today on May 21, 1998 within about 200 km of today's epicenter." (May 21, 2023, August 14, 2023)

 

Today's event is at 102 degrees from the M 7.7 in the Loyalty Islands of May 19 and may have been promoted by energy from that source.

 

O: 20SEP2023 19:22:34  44.9S   35.4E Mw=5.8  EMSC   PRINCE EDWARD ISLANDS REGION 

 

The strongest earthquake in the U.S. or Canada today was an M 5.4 in the Alaska Peninsula Alaska. NEIC reported it was felt with intensity V in Sand Point and King Cove and III in False Pass, Alaska. This is the strongest earthquake in the region of the Alaska Peninsula since an M 5.6 on August 3, 2023. At the time this summary noted:

 

 

"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. It is the second largest earthquake in this area since an M 6.1 on July 28 and July 29, 2020. In the past 15 years many of the strongest earthquakes in this region have occurred in mid- to late-July and early August, perhaps indicating a seasonal triggering component. All events in the region with M>=6 since 2008 have occurred in late July including an M 6.1 on July 16, 2011; an M 6.0 on July 19, 2018; an M 6.1 on July 28, 2020 and an M 7.2 on July 16, 2023." (August 3, 2023)

 

This event occurred near local solar noon and may have been promoted by strong tidal stresses which maximize near this hour. forecast 156562 had expected enhanced seismicity in this region in mid-September.

 

O: 21SEP2023 01:14:00  55.0N  160.5W Mw=5.4  EMSC   ALASKA PENINSULA             

P: 14SEP2023 156562    54.3N  161.7W 3.5-4.9 CAAAA  Unimak Islands, Aleutians  

 

An unusually large earthquake of M 3.8 hit the central Nunavut, Canada region today. It was not reported felt in this remote area. The last earthquake with M>=3.8 within about 200 km of today's epicenter in Nunavut, Canada occurred more than 10 years ago on  March 10, 2012 with M 4.2.

 

Forecast 156574 had expected today's event was likely in mid-September within

about 100 km of this epicenter. This activity is at 144 degrees from the Prince Edward Islands and at the third node (120 degrees) from the M 7.1 in  Java of August 28, 2023 and at 103 degrees from recent strong earthquakes in Tonga and  may have been promoted by energy from those sources.

 

O: 20SEP2023 14:22:14  64.9N   88.2W ML=3.8  EMSC   NUNAVUT, CANADA              

O: 20SEP2023 14:22:14  64.9N   88.2W MB=3.8  ECAN of Naujaat, NU   

P: 12SEP2023 156574    65.0N   86.0W 2.5-4.0 CAAAA  Nunavit/Hudson Bay, Canada 

 

An earthquake of M 4.4 also shook the northern Dominican Republic today.

NEIC reported this earthquake of M 4.4 in the Dominican Republic was felt with intensity II-III in the area(s) of the Dominican Republic with V in Mao Valverde; IV in Moncion Santiago Rodriguez, Villa Bisono, Santiago and lesser shaking in Altamira, Villa Gonzalez, Imbert, Puerto Plata, among others.  The last earthquake of larger magnitude within the Dominican Republic was an M 4.8 on May 18, 2023. Forecast 156422 had expected today's event was likely within about 50 km around September 20.

 

O: 20SEP2023 07:00:41  19.6N   70.8W mb=4.4  EMSC   DOMINICAN REPUBLIC           

P: 20SEP2023 156422    20.0N   71.0W 3.0-4.6 AAAAA  Bahamas/No. Caribbean      

 

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: 21SEP2023 06:34:25  36.1N   68.4E mb=4.1  EMSC   HINDU KUSH REGION, AFGHANISTAN

P:  8SEP2023 156182    36.0N   71.0E 3.8-5.2 DABAA  Hindu Kush/Pakistan        

 

INDONESIA AND PHILIPPINES

 

O: 21SEP2023 04:07:11   1.0N   98.2E mb=4.8  EMSC   NIAS REGION, INDONESIA       

P: 15SEP2023 156377     1.0N   98.0E 4.0-5.6 CAAAA  So. Sumatera               

 

O: 20SEP2023 18:00:43   1.2S  134.4E ML=4.4  EMSC   NEAR N COAST OF PAPUA, INDONES

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

 

O: 20SEP2023 20:33:34   3.8N  125.7E ML=4.4  EMSC   KEPULAUAN SANGIHE, INDONESIA 

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

 

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

 

CENTRAL AND SOUTH AMERICA

 

 

O: 20SEP2023 07:42:30   8.8S   79.8W ML=4.0  EMSC   NEAR COAST OF NORTHERN PERU  

P: 19SEP2023 156392     9.0S   80.0W 4.0-5.6 AAAAA  No. Peru                   

 

O: 20SEP2023 19:04:30   9.1N   84.9W ML=4.3  EMSC   COSTA RICA                   

P: 20SEP2023 156368     8.0N   83.0W 3.5-4.9 ABBAA  Costa Rica                 

 

O: 20SEP2023 07:17:30  10.9N   86.5W ML=4.0  EMSC   OFF COAST OF COSTA RICA      

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

P: 16SEP2023 156368     9.0N   86.0W 3.5-4.9 BBAAA  Costa Rica                 

 

O: 20SEP2023 21:50:24  14.7N   94.6W ML=4.2  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 20SEP2023 06:50:08  15.7N   93.9W ML=4.1  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 20SEP2023 14:28:33  15.9N   93.6W ML=4.1  EMSC   CHIAPAS, MEXICO              

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

 

O: 20SEP2023 18:42:51  16.6N  100.5W ML=4.0  EMSC   OFFSHORE GUERRERO, MEXICO    

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

 

O: 21SEP2023 03:55:25  17.1N   94.1W ML=4.1  EMSC   OAXACA, MEXICO               

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

 

O: 20SEP2023 19:59:16  17.7N  102.1W ML=4.4  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 19SEP2023 156412    18.0N  103.0W 3.5-5.2 AAAAA  Michoacan, Mexico          

 

O: 20SEP2023 20:38:39  18.7N   72.7W ML=3.9  EMSC   HAITI REGION                 

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

 

O: 21SEP2023 04:30:05  19.5N   65.5W MD=3.7  EMSC   PUERTO RICO REGION           

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

 

O: 20SEP2023 07:00:41  19.6N   70.8W mb=4.4  EMSC   DOMINICAN REPUBLIC           

P: 20SEP2023 156422    20.0N   71.0W 3.0-4.6 AAAAA  Bahamas/No. Caribbean       

 

O: 20SEP2023 14:49:01  24.2S   67.5W mb=4.7  EMSC   SALTA, ARGENTINA             

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

 

O: 20SEP2023 09:59:02  25.0S   70.2W mb=4.4  EMSC   ANTOFAGASTA, CHILE           

P: 13SEP2023 156595    24.0S   69.0W 4.0-5.6 CAAAA  Coast No. Chile            

 

 

AFRICA AND EUROPE

 

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

 

SOUTHWEST PACIFIC

 

O: 20SEP2023 09:32:32  14.7S  167.9E Mw=5.0  EMSC   VANUATU                      

P: 16SEP2023 156590    16.0S  168.0E 4.0-5.4 BBAAA  Vanuatu Islands            

 

O: 20SEP2023 08:50:27  18.0S  178.6W mb=4.6  EMSC   FIJI REGION                  

P: 15SEP2023 156588    17.0S  177.0W 4.0-5.6 BABAA  Tonga Islands               

 

O: 20SEP2023 11:00:35  22.9S  172.2E mb=4.6  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 17SEP2023 156602    23.0S  173.0E 4.0-5.6 BAAAA  Tonga/Fiji                 

P: 20SEP2023 156596    23.0S  170.0E 4.0-5.5 AABAA  Loyalty Islands             

 

OCEAN RIDGES

 

O: 20SEP2023 14:46:00   4.5S  105.8W Mw=6.0  EMSC   CENTRAL EAST PACIFIC RISE

O: 20SEP2023 15:03:37   4.6S  105.9W Mw=5.7  EMSC   CENTRAL EAST PACIFIC RISE

O: 20SEP2023 15:28:25   4.6S  106.2W mb=4.6  EMSC   CENTRAL EAST PACIFIC RISE

O: 20SEP2023 14:45:29   4.5S  105.7W mb=5.2  EMSC   CENTRAL EAST PACIFIC RISE    

P: 16SEP2023 156391     5.0S  105.0W 4.0-5.5 BAAAA  No. East Pacific Rise      

 

O: 20SEP2023 19:22:34  44.9S   35.4E Mw=5.8  EMSC   PRINCE EDWARD ISLANDS REGION 

 

O: 21SEP2023 02:14:14  71.7N   11.3W Mw=3.5  EMSC   JAN MAYEN ISLAND REGION      

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 21SEP2023 01:17:52  45.0S  167.5E ML=3.9  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 21SEP2023 01:17:52  45.0S  167.5E MS=4.0  GEONET South Island, N.Z.

P: 19SEP2023 156620    45.0S  167.0E 3.0-4.9 AAAAA  So. Island, N.Z.           

 

GEONET reported this earthquake was felt with weak intensity in the area southwest of Te Anau, South Island. 7 reports of felt intensity came from the area east and north of the epicenter with 6 weak, 0 light, 1 moderate, 0 strong, 0 severe and 0 extreme shaking.

 

JAPAN AND KURIL ISLANDS

 

O: 20SEP2023 14:00:15  40.2N  142.4E mb=4.4  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 18SEP2023 156508    41.0N  142.0E 3.5-5.6 AAAAA  Hokkaido, Japan            

 

O: 20SEP2023 22:17:32  46.8N  146.3E mb=4.6  EMSC   NORTHWEST OF KURIL ISLANDS   

P: 20SEP2023 156535    45.0N  146.0E 3.5-5.4 ABAAA  So. Kurils                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 21SEP2023 05:21:50  36.0N  120.6W MD=2.2  EMSC   CENTRAL CALIFORNIA           

P: 16SEP2023 156444    36.4N  121.1W 2.5-4.5 BAAAA  Central California         

 

O: 21SEP2023 05:06:57  38.9N  122.4W MD=2.2  EMSC   NORTHERN CALIFORNIA          

P: 17SEP2023 156445    39.0N  123.1W 2.5-4.6 BAAAA  Central California         

 

O: 20SEP2023 13:40:27  39.3N  117.3W ML=2.4  EMSC   NEVADA                       

P: 17SEP2023 156504    40.2N  119.6W 2.5-4.7 BABAA  California/Nevada area     

 

O: 20SEP2023 17:01:12  39.4N  122.6W MD=2.6  EMSC   NORTHERN CALIFORNIA          

P: 17SEP2023 156445    39.0N  123.1W 2.5-4.6 BAAAA  Central California         

 

NEIC reported this earthquake of M 2.6 in Northern California was felt with intensity II-III in the area(s) of Northern California in Elk Creek and Willows.

 

O: 20SEP2023 22:47:27  39.7N  120.6W ML=2.8  EMSC   NORTHERN CALIFORNIA

O: 20SEP2023 13:58:27  39.7N  120.6W MD=2.1  EMSC   NORTHERN CALIFORNIA          

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

 

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 Portola and Citrus Heights.

 

ALASKA

 

O: 20SEP2023 13:50:01  51.8N  178.5E ML=3.7  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 18SEP2023 156557    51.0N  178.0E 4.0-5.6 AAAAA  Rat Islands                

 

O: 21SEP2023 01:14:00  55.0N  160.5W Mw=5.4  EMSC   ALASKA PENINSULA              

P: 14SEP2023 156562    54.3N  161.7W 3.5-4.9 CAAAA  Unimak Islands, Aleutians  

 

O: 20SEP2023 23:15:47  63.0N  150.9W ML=3.3  EMSC   CENTRAL ALASKA               

P: 15SEP2023 156571    63.3N  151.0W 3.2-5.5 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: 20SEP2023 19:15:32  37.3N  104.5W ML=2.8  EMSC   COLORADO                     

P: 17SEP2023 156449    37.1N  104.7W 2.0-3.9 BAAAA  Colorado area              

 

NEIC reported this earthquake of M 2.8 in Southern Colorado was felt with intensity II-III in the area(s) of Southern Colorado in Trinidad (IV) and Model.

 

O: 20SEP2023 17:09:47  31.7N  104.4W ML=2.1  EMSC   WESTERN TEXAS

O: 20SEP2023 16:09:55  31.5N  104.2W ML=2.8  EMSC   WESTERN TEXAS                

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

 

EASTERN U.S./CANADA

 

O: 20SEP2023 10:27:11  34.5N   97.8W ML=3.0  EMSC   OKLAHOMA                     

P: 17SEP2023 156492    35.0N   96.0W 2.0-4.3 BABAA  Southern Plains            

 

NEIC reported this earthquake of M 2.9 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma in Duncan, Norman and Oklahoma City.

 

O: 20SEP2023 14:22:14  64.9N   88.2W ML=3.8  EMSC   NUNAVUT, CANADA              

O: 20SEP2023 14:22:14  64.9N   88.2W MB=3.8  ECAN of Naujaat, NU   

P: 12SEP2023 156574    65.0N   86.0W 2.5-4.0 CAAAA  Nunavit/Hudson Bay, Canada 

 

HAWAII

 

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

 

STRONG EARTHQUAKE SHAKES CENTRAL SOUTH ISLAND, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 19, 2023

 

The strongest earthquake in the world today was an M 5.6-6.2 in central South Island, New Zealand. NEIC reported it was felt with maximum intensity V in Canterbury at Rolleston and IV in Oamaru, Timaru, Lincoln, Christchurch with lesser shaking of II-III in Ashburton, Lyttelton, Te Puru-Thornton Bay, Waikato and Denedin Otago. GEONET reported it at M 6.2 and that it was felt with light intensity in the area of Central South Island, New Zealand. Of 14338 felt reports 4779 reports of light and 6786 of weak intensity with 1749 of moderate shaking and 169 with strong 2 with severe and 11 with extreme intensity came from the area. The last earthquake within about 150 km of this epicenter with M>=5.6 occurred on February 14, 2016 with M 5.8. The last of M>=6.2 was the Christchurch earthquake of M 7.0 of September 3, 2010 about 100 km north of today's epicenter.  Forecast 156620 had expected a moderate earthquake in this area of South Island was likely around September 17.

 

O: 20SEP2023 01:18:23  43.7S  171.1E ML=3.8  EMSC   SOUTH ISLAND OF NEW ZEALAND

O: 19SEP2023 21:14:49  43.7S  171.1E MS=6.2  GEONET South Island, New Zealand

O: 19SEP2023 21:14:50  43.7S  171.1E Mw=5.6  EMSC   SOUTH ISLAND OF NEW ZEALAND  

P: 17SEP2023 156620    44.0S  169.0E 3.0-5.1 AABAA  So. Island, N.Z.           

 

An unusual earthquake of M 4.5 hit near the northern coast of Libya today.  This appears to be part of an activation of the northern African and Western Europe area which in the past several days included an M 6.8 in Morocco and an M 5.1 in northern Italy among others. Moderate earthquakes in this region of Libya area rare. The last earthquake in Libya within about 150 km of this epicenter was an M 4.5 on November 16, 2005, the only such quake in this area in at least 35 years.  Forecast 156438 had expected today's event was likely in mid-September to the north of today's epicenter.

 

O: 20SEP2023 01:33:09  32.5N   24.6E mb=4.5  EMSC   NEAR COAST OF LIBYA          

P: 16SEP2023 156438    35.0N   25.0E 3.0-4.9 BCAAA  Aegean Sea                 

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Alaska Peninsula Alaska. NEIC reported it was felt with intensity III in Sand Point, Alaska.

 

An earthquake of M 4.4 also shook the northern Dominican Republic today. The last earthquake of larger magnitude within the Dominican Republic was an M 4.8 on May 18, 2023. Forecast 156422 had expected today's event was likely within about 50 km around September 20.

 

O: 20SEP2023 07:00:41  19.6N   70.8W mb=4.4  EMSC   DOMINICAN REPUBLIC           

P: 20SEP2023 156422    20.0N   71.0W 3.0-4.6 AAAAA  Bahamas/No. Caribbean      

 

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: 20SEP2023 02:31:38   1.6N  126.3E ML=4.1  EMSC   MOLUCCA SEA                  

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

 

O: 19SEP2023 20:09:36   9.0S  112.3E ML=4.3  EMSC   SOUTH OF JAVA, INDONESIA     

P: 20SEP2023 156396     6.0S  113.0E 4.0-5.6 ACAAA  So. of Bali                

 

O: 19SEP2023 21:10:54  10.8N  144.1E mb=4.8  EMSC   SOUTH OF MARIANA ISLANDS     

P: 15SEP2023 156420    12.0N  143.0E 4.0-5.4 BBAAA  So. Marianas/Guam          

 

NEIC reported this earthquake of M 4.8 in Guam was felt with intensity II-III in the area(s) of Guam in Tamuning.

 

CENTRAL AND SOUTH AMERICA

 

O: 20SEP2023 05:55:57   8.4N   83.0W ML=4.1  EMSC   PANAMA-COSTA RICA BORDER REGION

O: 19SEP2023 23:37:44   8.4N   82.9W ML=4.0  EMSC   PANAMA-COSTA RICA BORDER REGIO

P: 20SEP2023 156368     8.0N   83.0W 3.5-4.9 AAAAA  Costa Rica                 

 

O: 20SEP2023 07:42:30   8.8S   79.8W ML=4.0  EMSC   NEAR COAST OF NORTHERN PERU  

P: 19SEP2023 156392     9.0S   80.0W 4.0-5.6 AAAAA  No. Peru                   

 

O: 20SEP2023 07:17:30  10.9N   86.5W ML=4.0  EMSC   OFF COAST OF COSTA RICA      

P: 15SEP2023 156414    12.0N   87.0W 3.5-5.1 ABAAA  Nicaragua                  

P: 16SEP2023 156368     9.0N   86.0W 3.5-4.9 ABAAA  Costa Rica                 

 

O: 20SEP2023 06:25:12  14.5N   92.7W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 17SEP2023 156406    14.0N   92.0W 3.5-5.2 BAAAA  Guatemala                  

 

O: 20SEP2023 06:50:08  15.7N   93.9W ML=4.1  EMSC   OFFSHORE CHIAPAS, MEXICO     

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

 

O: 20SEP2023 02:25:47  16.3N   98.3W ML=4.4  EMSC   OAXACA, MEXICO               

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

 

O: 19SEP2023 18:40:29  18.0N  101.8W ML=4.1  EMSC   GUERRERO, MEXICO             

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

 

NEIC reported this earthquake of M 4.2 in Guerrero, Mexico was felt with intensity II-III in the area(s) of Guerrero, Mexico in Acapulco.

 

O: 19SEP2023 23:44:27  18.5N   73.9W ML=3.3  EMSC   HAITI REGION                 

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

 

O: 20SEP2023 04:32:39  19.1N   65.6W MD=3.5  EMSC   PUERTO RICO REGION

O: 19SEP2023 22:02:03  19.2N   65.5W MD=3.3  EMSC   PUERTO RICO REGION

O: 19SEP2023 22:35:00  19.1N   65.5W MD=3.7  EMSC   PUERTO RICO REGION           

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

 

O: 20SEP2023 03:41:32  19.9N   71.8W ML=3.2  EMSC   DOMINICAN REPUBLIC REGION

O: 20SEP2023 07:00:41  19.6N   70.8W mb=4.4  EMSC   DOMINICAN REPUBLIC           

P: 20SEP2023 156422    20.0N   71.0W 3.0-4.6 AAAAA  Bahamas/No. Caribbean      

 

O: 19SEP2023 22:18:38  22.0N  107.9W ML=4.1  EMSC   OFF COAST OF SINALOA, MEXICO 

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

 

 

AFRICA AND EUROPE

 

O: 20SEP2023 01:33:09  32.5N   24.6E mb=4.5  EMSC   NEAR COAST OF LIBYA          

P: 16SEP2023 156438    35.0N   25.0E 3.0-4.9 BCAAA  Aegean Sea                 

 

O: 20SEP2023 09:17:43  31.2N    8.2W ML=3.4  EMSC   MOROCCO                      

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

 

NEIC reported this earthquake of M 4.6 in Poland was felt with intensity IV in the area(s) of Poland in Lubin and Glogow.

 

SOUTHWEST PACIFIC

 

O: 20SEP2023 09:32:32  14.7S  167.9E Mw=5.0  EMSC   VANUATU                      

P: 16SEP2023 156590    16.0S  168.0E 4.0-5.4 BBAAA  Vanuatu Islands            

 

O: 20SEP2023 08:50:27  18.0S  178.6W mb=4.6  EMSC   FIJI REGION                  

P: 15SEP2023 156588    17.0S  177.0W 4.0-5.6 BABAA  Tonga Islands              

 

O: 20SEP2023 05:42:43  20.8S  178.3W mb=4.6  EMSC   FIJI REGION                  

P: 17SEP2023 156587    19.0S  173.0W 4.0-5.9 BBCAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 20SEP2023 00:27:17  36.6S   97.0W mb=4.9  EMSC   WEST CHILE RISE              

 

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 20SEP2023 01:18:23  43.7S  171.1E ML=3.8  EMSC   SOUTH ISLAND OF NEW ZEALAND

O: 19SEP2023 21:14:49  43.7S  171.1E MS=6.2  GEONET South Island, New Zealand

O: 19SEP2023 21:14:50  43.7S  171.1E Mw=5.6  EMSC   SOUTH ISLAND OF NEW ZEALAND  

P: 17SEP2023 156620    44.0S  169.0E 3.0-5.1 AABAA  So. Island, N.Z.           

 

JAPAN AND KURIL ISLANDS

 

O: 19SEP2023 22:01:05  31.4N  141.8E mb=4.4  EMSC   IZU ISLANDS, JAPAN REGION

O: 19SEP2023 22:17:47  30.9N  142.0E Mw=5.2  EMSC   IZU ISLANDS, JAPAN REGION    

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

 

O: 20SEP2023 00:49:12  40.3N  145.1E mb=4.7  EMSC   OFF EAST COAST OF HONSHU, JAPA

P: 18SEP2023 156490    39.0N  143.0E 4.0-5.4 ABBAA  So. of Honshu              

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 20SEP2023 04:56:47  31.4N  115.4W ML=3.1  EMSC   BAJA CALIFORNIA, MEXICO      

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

 

NEIC reported this earthquake of M 3.1 in Greater Los Angeles, California was felt with intensity II-III in the area(s) of Greater Los Angeles, California in Fontana, Rancho Cucamonga, Rialto, Bloomington, and others.

 

O: 20SEP2023 01:40:30  35.4N  118.5W ML=2.1  EMSC   CENTRAL CALIFORNIA           

P: 17SEP2023 156486    35.3N  118.6W 2.5-4.6 BAAAA  So. California             

 

O: 20SEP2023 02:39:38  38.2N  117.8W ML=3.3  EMSC   NEVADA                       

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

 

NEIC reported this earthquake of M 3.1 in Northern California was felt with intensity II-III in the area(s) of Northern California in Patterson, Newman, Tracy, Modesto, Turlock, Delhi, Pleasanton, Los Banos, Stockton, Atwater among others.

 

O: 20SEP2023 00:03:37  40.9N  124.2W MD=2.8  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 19SEP2023 156526    40.5N  125.8W 2.5-4.6 AAAAA  Off Coast of No. Calif     

 

NEIC reported this earthquake of M 2.9 in northern California was felt with intensity II-III in the area(s) of northern California in Arcata, Bayside, McKinleyville, Eureka and Korbel.

 

ALASKA

 

O: 20SEP2023 06:15:47  59.9N  152.8W ML=3.2  EMSC   SOUTHERN ALASKA              

P: 18SEP2023 156568    60.2N  153.2W 3.2-5.2 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 Willow, Talkeetna, Chugiak, Anchorage.

 

O: 19SEP2023 22:17:51  69.2N  144.6W ML=3.2  EMSC   NORTHERN 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: 20SEP2023 00:58:52  31.7N  104.4W ML=2.0  EMSC   WESTERN TEXAS                 

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

 

O: 20SEP2023 06:11:04  32.1N  101.1W ML=2.2  EMSC   WESTERN TEXAS

O: 20SEP2023 01:29:57  32.5N  102.1W ML=2.8  EMSC   WESTERN TEXAS                

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

 

O: 20SEP2023 05:52:10  38.0N  104.7W ML=2.2  EMSC   COLORADO                     

P: 17SEP2023 156449    37.1N  104.7W 2.0-3.9 BAAAA  Colorado area              

 

EASTERN U.S./CANADA

 

NEIC reported an earthquake of M 2.6 in Southern Nebraska was felt with intensity II-III in the area(s) of Southern Nebraska in Blue Hill.

 

O: 20SEP2023 00:55:41  34.5N   97.7W ML=2.1  EMSC   OKLAHOMA

O: 19SEP2023 22:30:03  34.5N   97.8W ML=2.9  EMSC   OKLAHOMA                     

P: 14SEP2023 156492    34.0N   97.0W 2.0-4.4 BAAAA  Southern Plains            

 

NEIC reported this earthquake of M 2.7 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma in Oklahoma City.

 

O: 20SEP2023 03:17:36  46.9N   66.0W MB=1.8  ECAN of Red Bank, NB                

P: 14SEP2023 156506    46.0N   66.0W 2.0-4.5 AAAAA  E. of Maine                

 

O: 19SEP2023 19:11:18  51.2N   90.8W MB=2.0  ECAN of Osnaburgh 63B, ON           

 

O: 19SEP2023 01:07:23  49.3N   67.6W MB=2.1  ECAN of Godbout, QC                 

P: 11SEP2023 156513    49.3N   67.5W 2.0-4.2 CAAAA  Maine                      

 

O: 18SEP2023 11:18:26  45.1N   66.3W MB=2.0  ECAN of Musquash, NB                

P: 14SEP2023 156506    46.0N   66.0W 2.0-4.5 BAAAA  E. of Maine                

 

O: 18SEP2023 11:02:59  45.3N   71.2W MB=2.0  ECAN of Chartierville, QC           

P: 14SEP2023 156520    44.0N   73.0W 2.0-4.3 BBBAA  New England                

 

O: 18SEP2023 09:31:57  41.8N   81.0W MB=2.2  ECAN of Cleveland, OH               

P: 14SEP2023 156528    41.8N   81.4W 2.0-3.9 BAAAA  Ohio/Lake Erie             

 

HAWAII

 

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

 

MODERATE QUAKE SHAKES NORTHERN CALIFORNIA EAST OF SAN FRANCISCO

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 18, 2023

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in Northern California east of the San Francisco, California Bay. This event was widely felt throughout much of central and northern California. NEIC gave maximum intensity IV was felt in California in Patterson, Newman, Crows Landing, Modesto, Tracy with III in Livermore, Ceres, Manteca, San Francisco and as far as southern California. The mainshock was preceded by an M 4.0 foreshock, among others of smaller magnitude and by a number of felt aftershocks of M>=3. The aftershocks were generally felt in the Patterson, Newman, Livermore, Tracy, Morgan Hill, Modesto, Ripon and San Jose area with intensity II-III but the M 4.0 foreshock was felt with intensity IV in Patterson. This largest event in the series may have been triggered by an M1.1 class solar flare which coincided with it. The preliminary parameters from SWPC for this flare are:

 

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

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

 

XXXX       0344   0400      0410   M1.1      (September 19, 2023)   1.1E-02  

 

This is the first M-class solar flare in the past three days.

 

The earthquakes in California also occurred at the height of the strongest geomagnetic storm since September 2 and may have been promoted by changes in the geomagnetic field associated with that storm. This summary noted in this regard:

 

"The geomagnetic field saw minor storm conditions today. The AP level was 30.  High latitudes  saw major storm conditions with AP 49. Middle latitudes were at active conditions with AP 21. This is the strongest disturbance in the geomagnetic field since AP reached 38 on September 2 with high latitude AP 59 on that date. This storm is expected to intensity on September 19, 2023. Some initial seismic enhancement is likely with a stronger intense period around September 21-22." (September 19, 2023)

 

Today's event in Northern California is the first of M>=4.5 within about 100 km of today's epicenter since an M 5.1 about 50 km southwest of this on October 25, 2022 and may be a regional aftershock of that event. At the time this summary noted in this regard:

 

 

 

"Another actor promoting this earthquake at this time was a Tropical Cyclone making slope-fall off Virginia at this time. This summary had noted the possible effect on the western edge of the North American plate in the previous issues as:

 

"A tropical cyclone may be forming in the North Atlantic east of Georgia and South Carolina. This system is expected by NHC to reach Tropical Depression status in the next day at 40% likelihood. It is not expected to make landfall but is near the continental slope and could affect seismicity in the western North American Plate. This system is currently near 35N 65W." (October 23-24, 2022)

 

The last earthquake in the San Jose/San Francisco, California area with equal or larger magnitude than M 5.1 occurred on October 31, 2007 with M 5.5. Other earthquakes of M>=5 hit the area with M 5.2 on August 12, 1998, January 16, 1993 and April 18, 1990. At the time of the M 5.5 on October 31, 2007 ..." (October 25, 2022)

 

 

The last earthquake in the San Jose/San Francisco, California area with equal or larger magnitude than M 5.1 occurred on October 31, 2007 with M 5.5. Other earthquakes of M>=5 hit the area with M 5.2 on August 12, 1998, January 16, 1993 and April 18, 1990. At the time of the M 5.5 on October 31, 2007 this summary noted in this regard:

 

"A strongly felt earthquake hit the San Francisco Bay region tonight with M 5.6. ... The earthquake in the San Francisco Bay region was preceded several hours earlier by an event of M 2.9 which hit to the  northwest and may have set up the conditions for the larger earthquake. ...  The earthquake was generally felt within about 300 km of the epicenter with lesser intensities. This was the strongest earthquake to hit the San Francisco area since the World Series earthquake in October, 1989 (M 7.0). While pictures fell from walls and items fell from  shelves throughout much of the area no immediate reports of major damage or casualties were available. The earthquake appears to have occurred on the Calaveras Fault. A contributing factor for the occurrence of this earthquake at this time may have been the strong geomagnetic storms which occurred late on October 25 and again this morning. The storms occurred while San Francisco was sub-solar and the effects were maximized. It is common for storms such as this to have their maximum effect on seismicity 4.5-5.0 days following the onset. The earthquake in San Francisco did occur five days after the onset of this storm which was the strongest to occur at mid-latitudes in the past month and the second strongest to occur in the past three months (Kp 36)." (October 31, 2007)

 

The factors noted in the previous strong activity in this area were all prevalent today including the landfall of Hurricane Lee in the northeastern U.S. and eastern Canada and a strong geomagnetic storm and may be notable for triggering in this region.

 

Forecast 156444 had expected enhanced seismicity was likely in this region in mid-September.

 

O: 19SEP2023 00:15:32  37.4N  121.3W Mw=4.0  EMSC   NORTHERN CALIFORNIA

O: 19SEP2023 03:44:30  37.4N  121.3W Mw=3.5  EMSC   NORTHERN CALIFORNIA

O: 19SEP2023 04:40:58  37.4N  121.3W ML=3.1  EMSC   NORTHERN CALIFORNIA

O: 19SEP2023 04:48:37  37.4N  121.3W MD=2.1  EMSC   NORTHERN CALIFORNIA

O: 19SEP2023 05:25:20  37.4N  121.2W ML=3.2  EMSC   NORTHERN CALIFORNIA

O: 19SEP2023 04:13:10  37.5N  121.2W Mw=4.5  EMSC   NORTHERN CALIFORNIA          

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

P: 16SEP2023 156444    36.4N  121.1W 2.5-4.5 BBAAA  Central California         

 

The earthquake in California was preceded by an M 3.4 in southern Nebraska. This event was reported felt with intensity II-III in Nebraska at Blue Hill, Guide Rock, Hastings, Grand Island, Fremont and South Sioux City. Earthquakes in Nebraska often precede significant earthquakes in northern and central California as previously noted in this summary.  Fore example a slightly smaller event near this epicenter in Nebraska of August 22, 2023 caused the following note to be published in this summary:

 

"A pair of light earthquakes of M 2.9 and 2.7 occurred today south of Lincoln and Hastings, Nebraska. NEIC reported they were felt with intensity IV in Nebraska at Ashton.  Earthquakes in this region of Nebraska often precede stronger events on the North American-Pacific tectonic plate boundary. In the current situation with Hurricane Hilary and accompanying M 5.1 in Southern California this possibility may be somewhat mitigated. This is the third earthquake of M 2.9 in this region of Nebraska in the current year. These follow an M 3.7 on July 17, 2022 southeast of today's epicenter - the only event of M>2.9 in Nebraska in the past 3 years. At the time of the M 3.7 this summary noted:

 

"An unusual M 3.8 earthquake occurred on the Nebraska-Kansas border south of Lincoln and Grand Island, Nebraska near Superior. NEIC reported this earthquake of M 3.8 in Nebraska was felt with intensity IV-V   in the area(s) of Nebraska at Superior, Guide Rock and in Mankato Kansas, with lesser shaking in Hardy, Red Cloud, Deshler, Glenvil, Nebraska and in Kansas at Webber, Smith Center, Republic. This is the strongest earthquake in southern Nebraska within about 150 km of this epicenter since an M 3.8 on May 6, 2021. The only event of larger magnitude in this area in the past 30 years was an M 4.5 on June 22, 2019.  Earthquakes in Nebraska and South Dakota often precede strong earthquakes along the western rim of North America and with a strong coming geomagnetic storm this is a possibility. When the event occurred on May 6, 2021 this summary noted in this regard:

 

"A series of light earthquakes also occurred today in the region of northern

Kansas. This included an M 3.8 and aftershocks of M 3.0, 3.1 and 3.1. An M 3.8 in northern Kansas today was widely felt.  NEIC reported this earthquake and aftershocks of M 3.1 in Kansas was felt with intensity IV in the area(s) of Kansas at Formoso, Courtland, Burr Oak, Hope and II-III in Jewel, Randall, Webber, Mankato, Belleville, Concordia, and Bend, Herington and Ramona. Other aftershocks of M 3.1 and 3.0 in Kansas were felt with intensity IV in Formoso and possibly in Sylvan Grove and in Peru, Nebraska. This is the strongest earthquake within about 100 km of this epicenter in the past year. An M 4.5 occurred about 150 km southeast of this in Kansas on January 19, 2020. Forecast 133547 had expected today's activity in northern Kansas was likely around May 4." (May 7, 2021)

 

When the M 4.5 hit on June 23, 2019 it was noted as:

 

"As noted in previous issues of this summary, moderate earthquakes in the area of Kansas, Nebraska and South Dakota are often followed within hour by moderate to strong quakes along the western boundary of North America - often in the regions off the coast of Oregon and Washington and this appears to be the case in this instance." (June 23, 2019, July 17, 2022, August 22, 2023)

 

At M 3.4 this is the strongest earthquake in Nebraska recorded in the past three years. The last event in Nebraska with M>=3.4 within about 200 km of this epicenter was an M 3.6 on July 26, 2022. 

 

Forecast 156493 had expected regional seismic enhancement was likely in Nebraska and northern Kansas around September 16.

 

O: 18SEP2023 14:34:40  40.2N   98.3W ML=3.4  EMSC   NEBRASKA                     

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

 

Three moderately strong earthquakes occurred in the region of Japan today - an M 6.4-6.8 in the Ryukyu Islands, an M 5.8 in the Izu Islands south of Tokyo and an M 5.5 off the coast of northeastern Honshu. The strongest earthquake of the day in the world was the M 6.4-6.8 in the Ryukyu Islands near Okinawa, Japan. NEIC reported it was felt with maximum intensity IV in Okinawa at Naha and Urasoe with III in Tomigusuku, Yomitan, Chatan, Okinawa, Ginowan, Ishikawa, Gushikawa and Nago among others. CWB reported this earthquake at M 6.8 was felt with intensity I in Hualien, Yilan, Nantou, Taichung, Changhua, Taitung, Yunlin, and Chiayi Counties, Taiwan. Only two earthquakes of M>=6.4 have been recorded within about 250 km of today's epicenter in the past 35 years - an M 6.5 on March 2, 2014 and an M 6.9 on November 8, 2011. Today's earthquake was simultaneous with the beginning of flare 190 and may have been promoted by SFE from that flare.

 

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

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

 

 190       1321   1338      1359   C1.5      (September 18, 2023)   3.3E-03      

 

Forecast 156431 had expected today's event within about 100 km was likely in mid-September. This epicenter is located near 103 degrees from the M 6.8 in Morocco of September 8 and was probably promoted by energy from that source.

 

O: 18SEP2023 13:21:24  26.5N  125.3E Mw=6.4  ANSS   NORTHEAST OF TAIWAN          

O: 18SEP2023 13:21:24  26.5N  125.3E Mw=6.3  EMSC   NORTHEAST OF TAIWAN          

O: 18SEP2023 13:21:19  26.8N  126.0E Mw=6.8  CWB    NORTHEAST OF TAIWAN          

P: 13SEP2023 156431    26.0N  125.0E 4.0-5.4 BAAAA  Ryukyu Islands             

P: 19SEP2023 156431    25.0N  124.0E 4.0-5.6 ABAAA  Ryukyu Islands             

 

An M 5.8 also occurred in the Izu Islands south of southeastern Honshu, Japan today. A similar M 5.8 occurred on February 5, 2023 and an M 6.3 in the Izu Islands was recorded on January 16, 2023. At the time of that event this summary  noted:

 

"The strongest earthquake in the world today was an M 6.3 in the Izu Islands, Japan. NEIC reported it was felt with intensity II-III in Japan at Shizuoka, Kanagawa, Tokyo, Chiba, Fukushima and Okinawa Prefectures. This follows an M 5.2 in the area yesterday. In the previous summary it had been noted in this regard:

 

"The strongest earthquake in the world today was an M 5.2 in the Izu Islands of Southeastern Japan. Today's event was reported by JMA to have been lightly felt in southeastern Honshu, Japan. The last earthquake in the Izu Islands of significantly larger magnitude in this area of Izu Islands occurred on August 4, 2022 with M 5.7 after similar activity on July 31, 2022." (January 16, 2023)

 

Forecast 156469 ad expected today's activity within about 50 km was likely around September 18.

 

O: 18SEP2023 11:31:11  29.7N  139.1E mb=4.5  EMSC   IZU ISLANDS, JAPAN REGION    

O: 19SEP2023 06:22:38  31.0N  142.0E Mw=5.8  EMSC   IZU ISLANDS, JAPAN REGION    

O: 18SEP2023 21:33:29  31.5N  141.8E mb=4.5  EMSC   IZU ISLANDS, JAPAN REGION    

O: 19SEP2023 00:00:17  31.5N  142.0E mb=4.6  EMSC   IZU ISLANDS, JAPAN REGION    

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

 

The earthquake off the northern coast of Honshu, Japan of M 5.5 followed a similar M 5.5 on September 8, 2023. At the time this summary noted in this regard:

 

 

"An M 5.5 was also reported off the east coast of northern Honshu, Japan today. NEIC reported it was felt with intensity II-III in Iwate, Miyagi, Fukushima, Aomori, Saitama and Tokyo 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." (September 8, 2023)

 

Forecast 156471 had expected today's event within about 50 km was likely around September 18 off northern Japan.

 

O: 18SEP2023 19:33:04  38.5N  141.6E Mw=5.5  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 18SEP2023 156471    39.0N  142.0E 4.0-5.5 AAAAA  Off East Coast Honshu      

 

The mainshock in the Vancouver area yesterday has been reanalyzed. The current magnitude is given as M 6.0. This event was probably promoted by strong geomagnetic and weather-related stresses (see previous issues of this summary. This summary noted this event in the previous issue as:

 

 

"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." (September 18, 2023)

 

Forecast 156546 had expected this event within about 15 km was likely in mid-September.

 

O: 17SEP2023 11:28:08  50.6N  130.5W MB=6.0  ECAN of Port Hardy, BC  

O: 17SEP2023 15:19:49  50.7N  130.5W MB=4.5  ECAN of Port Hardy, BC              

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

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: 18SEP2023 16:31:57  35.8N   59.2E ML=4.0  EMSC   NORTHEASTERN IRAN            

P: 12SEP2023 156489    31.0N   57.0E 3.8-5.4 CCBAA  So. Iran                   

 

NEIC reported this earthquake of M 3.8 in Northeastern Iran was felt with intensity II-III in the area(s) of Northeastern Iran in Meshed Khorasan-e Razavi.

 

O: 19SEP2023 05:28:37  37.4N   73.2E mb=4.6  EMSC   HINDU KUSH REGION, AFGHANISTAN

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

 

O: 19SEP2023 00:57:34  43.2N   78.5E mb=4.5  EMSC   EASTERN KAZAKHSTAN           

P: 12SEP2023 156512    41.0N   77.0E 4.0-5.4 CCAAA  Kirgizstan/Xinjiang        

 

O: 18SEP2023 13:37:40  54.0N  159.8E mb=4.6  EMSC   NEAR EAST COAST OF KAMCHATKA 

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

P: 17SEP2023 156548    52.0N  161.0E 4.0-5.4 ABAAA  E. of Kamchatka            

 

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

 

INDONESIA AND PHILIPPINES

 

O: 19SEP2023 04:09:56   1.3N  128.1E ML=4.2  EMSC   HALMAHERA, INDONESIA         

P: 19SEP2023 156371     1.0N  128.0E 4.0-5.4 AAAAA  Halmahera                  

 

O: 18SEP2023 16:40:41   3.6S  149.7E mb=4.6  EMSC   BISMARCK SEA                 

P: 16SEP2023 156389     4.0S  151.0E 4.0-5.4 AAAAA  New Ireland                 

 

O: 18SEP2023 17:27:35   4.3S  134.1E ML=4.4  EMSC   NEAR S COAST OF PAPUA, INDONES

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

 

O: 18SEP2023 17:57:30   5.1S  102.0E mb=4.4  EMSC   SOUTHWEST OF SUMATRA, INDONESI

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

 

O: 19SEP2023 04:32:09   6.3N  127.1E mb=5.0  EMSC   PHILIPPINE ISLANDS REGION    

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

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

 

O: 18SEP2023 20:12:57   8.5S  109.0E ML=4.1  EMSC   JAVA, INDONESIA              

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

P: 18SEP2023 156586    10.0S  109.0E 4.0-5.4 ABAAA  So. of Java                

 

O: 18SEP2023 11:02:06  13.0N  121.1E mb=4.8  EMSC   MINDORO, PHILIPPINES         

P: 18SEP2023 156409    13.0N  122.0E 3.5-4.9 AAAAA  Luzon, Philippines         

 

NEIC reported this earthquake of M 4.8 in Mindoro, Philippines was felt with intensity II-III in the area(s) of Mindoro, Philippines in San Jose, Southern Tagalog.

 

 

CENTRAL AND SOUTH AMERICA

 

O: 18SEP2023 22:33:48   4.9S   80.8W ML=4.0  EMSC   PERU-ECUADOR BORDER REGION   

P:  8SEP2023 156108     4.0S   80.0W 4.0-5.8 CAAAA  Ecuador                    

 

O: 18SEP2023 10:02:53   7.1N   72.0W mb=4.5  EMSC   APURE, VENEZUELA             

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

 

O: 18SEP2023 08:38:14  14.1N   92.1W ML=4.3  EMSC   OFFSHORE GUATEMALA

O: 18SEP2023 12:26:28  14.0N   92.5W ML=4.2  EMSC   OFFSHORE GUATEMALA           

P: 17SEP2023 156406    14.0N   92.0W 3.5-5.2 AAAAA  Guatemala                  

 

O: 18SEP2023 17:20:23  15.2N   94.5W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 18SEP2023 22:05:31  14.7N   94.6W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

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

 

O: 18SEP2023 08:35:11  18.1N   71.4W ML=3.0  EMSC   DOMINICAN REPUBLIC           

O: 18SEP2023 08:59:05  18.1N   71.4W ML=3.0  EMSC   DOMINICAN REPUBLIC

P: 20SEP2023 156422    20.0N   71.0W 3.0-4.6 ABAAA  Bahamas/No. Caribbean      

 

O: 19SEP2023 01:04:56  18.2N   69.0W ML=3.0  EMSC   DOMINICAN REPUBLIC REGION    

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

 

O: 18SEP2023 17:01:22  19.2N   66.7W MD=3.6  EMSC   PUERTO RICO REGION           

O: 19SEP2023 03:53:59  17.9N   67.0W MD=3.0  EMSC   PUERTO RICO REGION

P: 16SEP2023 156422    20.0N   68.0W 3.0-4.6 AABAA  Bahamas/No. Caribbean      

 

O: 19SEP2023 02:37:19  18.7N   64.1W MD=3.6  EMSC   VIRGIN ISLANDS REGION

O: 19SEP2023 01:53:16  19.6N   64.6W MD=3.8  EMSC   VIRGIN ISLANDS REGION        

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

 

O: 19SEP2023 06:49:36  17.5N   72.5W ML=3.1  EMSC   HAITI REGION

O: 18SEP2023 16:33:56  20.0N   73.6W ML=3.7  EMSC   HAITI REGION                 

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

 

O: 18SEP2023 16:20:15  20.7S   67.3W mb=4.3  EMSC   POTOSI, BOLIVIA              

P: 20SEP2023 156591    21.0S   68.0W 4.0-6.2 AAAAA  Argentina                  

 

NEIC reported this earthquake of M 4.1 in Northern Chile was felt with intensity II-III in the area(s) of Northern Chile in Iquique, Tarapaca.

 

AFRICA AND EUROPE

 

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

 

SOUTHWEST PACIFIC

 

O: 18SEP2023 22:40:59  10.0S  160.9E mb=4.9  EMSC   SOLOMON ISLANDS              

P: 16SEP2023 156589    11.0S  163.0E 4.0-5.5 AABAA  Vanuatu Islands            

 

O: 19SEP2023 03:28:22  13.2S  167.2E mb=4.9  EMSC   VANUATU                      

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

 

O: 18SEP2023 15:19:27  14.3S  167.4E mb=4.7  EMSC   VANUATU

O: 18SEP2023 19:44:40  14.7S  167.4E mb=4.8  EMSC   VANUATU                      

P: 16SEP2023 156590    16.0S  168.0E 4.0-5.4 ABAAA  Vanuatu Islands            

 

OCEAN RIDGES

 

O: 18SEP2023 16:49:31  55.9S  129.1W mb=5.2  EMSC   PACIFIC-ANTARCTIC RIDGE

O: 18SEP2023 17:06:04  55.4S  128.7W mb=4.8  EMSC   PACIFIC-ANTARCTIC RIDGE      

P: 16SEP2023 156622    56.0S  122.0W 4.0-5.7 AACAA  Pacific-Antarctic Ridge    

 

O: 18SEP2023 22:02:35  64.4N   20.7W ML=3.6  EMSC   ICELAND                      

P: 10SEP2023 156303    66.0N   17.0W 3.0-4.5 CBBAA  Iceland area               

 

 

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: 18SEP2023 13:21:24  26.5N  125.3E Mw=6.3  EMSC   NORTHEAST OF TAIWAN          

O: 18SEP2023 13:21:19  26.8N  126.0E Mw=6.8  CWB    NORTHEAST OF TAIWAN           

P: 13SEP2023 156431    26.0N  125.0E 4.0-5.4 BAAAA  Ryukyu Islands             

P: 19SEP2023 156431    25.0N  124.0E 4.0-5.6 ABAAA  Ryukyu Islands             

 

O: 19SEP2023 04:35:30  29.3N  129.2E ML=4.3  EMSC   RYUKYU ISLANDS, JAPAN        

P: 18SEP2023 156427    29.0N  131.0E 4.0-5.6 AABAA  Kyushu Japan               

 

O: 18SEP2023 11:31:11  29.7N  139.1E mb=4.5  EMSC   IZU ISLANDS, JAPAN REGION    

O: 19SEP2023 06:22:38  31.0N  142.0E Mw=5.8  EMSC   IZU ISLANDS, JAPAN REGION    

O: 18SEP2023 21:33:29  31.5N  141.8E mb=4.5  EMSC   IZU ISLANDS, JAPAN REGION    

O: 19SEP2023 00:00:17  31.5N  142.0E mb=4.6  EMSC   IZU ISLANDS, JAPAN REGION    

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

 

O: 18SEP2023 20:32:10  33.2N  138.3E mb=4.1  EMSC   IZU ISLANDS, JAPAN REGION    

P: 18SEP2023 156448    34.0N  137.0E 3.5-4.9 AAAAA  Central/So. Honshu Japan   

 

O: 18SEP2023 19:33:04  38.5N  141.6E Mw=5.5  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 18SEP2023 156471    39.0N  142.0E 4.0-5.5 AAAAA  Off East Coast Honshu      

 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 18SEP2023 08:16:27  31.4N  114.4W ML=3.3  EMSC   GULF OF CALIFORNIA

O: 18SEP2023 08:29:55  31.4N  114.5W ML=3.7  EMSC   GULF OF CALIFORNIA

O: 18SEP2023 22:27:46  30.6N  114.6W ML=3.6  EMSC   GULF OF CALIFORNIA           

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

 

O: 18SEP2023 19:12:50  31.4N  115.5W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO      

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

 

O: 19SEP2023 04:50:24  34.0N  117.0W ML=2.6  EMSC   SOUTHERN CALIFORNIA          

O: 19SEP2023 04:14:09  34.8N  117.4W ML=2.3  EMSC   SOUTHERN CALIFORNIA          

P: 18SEP2023 156481    34.1N  117.4W 2.5-4.6 AAAAA  So. California             

 

NEIC reported this earthquake of M 2.6 in Southern California was felt with intensity II-III in the area(s) of Southern California in Yucaipa, Calimesa, Banning, Forest Falls and Redlands.

 

O: 18SEP2023 23:25:34  36.2N  120.8W MD=2.9  EMSC   CENTRAL CALIFORNIA           

P: 16SEP2023 156444    36.4N  121.1W 2.5-4.5 AAAAA  Central California         

 

NEIC reported this earthquake of M 3.0 in Central California was felt with intensity II-III in the area(s) of Central California in San Ardo, Hollister, Los Banos, Dos Palos, Lost Hills, Alameda and Ione.

 

O: 19SEP2023 00:15:32  37.4N  121.3W Mw=4.0  EMSC   NORTHERN CALIFORNIA

O: 19SEP2023 03:44:30  37.4N  121.3W Mw=3.5  EMSC   NORTHERN CALIFORNIA

O: 19SEP2023 04:40:58  37.4N  121.3W ML=3.1  EMSC   NORTHERN CALIFORNIA

O: 19SEP2023 04:48:37  37.4N  121.3W MD=2.1  EMSC   NORTHERN CALIFORNIA

O: 19SEP2023 05:25:20  37.4N  121.2W ML=3.2  EMSC   NORTHERN CALIFORNIA

O: 19SEP2023 04:13:10  37.5N  121.2W Mw=4.5  EMSC   NORTHERN CALIFORNIA          

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

P: 16SEP2023 156444    36.4N  121.1W 2.5-4.5 BBAAA  Central California         

 

O: 18SEP2023 21:02:27  38.8N  122.8W MD=2.1  EMSC   NORTHERN CALIFORNIA          

P: 17SEP2023 156445    39.0N  123.1W 2.5-4.6 AAAAA  Central California         

 

O: 18SEP2023 15:06:40  39.2N  120.1W MD=2.0  EMSC   NORTHERN CALIFORNIA

O: 18SEP2023 15:14:54  39.2N  120.1W MD=2.0  EMSC   NORTHERN CALIFORNIA

O: 18SEP2023 10:11:37  39.5N  120.2W MD=1.7  EMSC   NORTHERN CALIFORNIA

O: 18SEP2023 08:04:48  39.2N  120.1W MD=2.0  EMSC   NORTHERN CALIFORNIA          

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

 

O: 19SEP2023 02:50:17  40.4N  125.2W ML=3.3  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 19SEP2023 156526    40.5N  125.8W 2.5-4.6 AAAAA  Off Coast of No. Calif     

 

NEIC reported this earthquake of M 3.3 off the coast of Northern California  was felt with intensity II-III in the area(s) of Northern California in Fortuna.

 

ALASKA

 

O: 18SEP2023 07:03:12  52.0N  174.2W ML=3.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 17SEP2023 156543    50.6N  174.7W 3.5-4.9 ABAAA  Andreanoff Isls, Aleutians 

 

O: 18SEP2023 21:36:56  55.5N  158.0W ML=3.2  EMSC   ALASKA PENINSULA             

P: 15SEP2023 156541    54.8N  158.7W 3.5-5.1 BAAAA  Alaska Peninsula           

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 17SEP2023 11:28:08  50.6N  130.5W MB=6.0  ECAN of Port Hardy, BC  

O: 17SEP2023 15:19:49  50.7N  130.5W MB=4.5  ECAN of Port Hardy, BC              

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

 

ROCKY MOUNTAINS REGION

 

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

 

EASTERN U.S./CANADA

 

O: 18SEP2023 23:11:34  34.9N   97.3W ML=2.5  EMSC   OKLAHOMA                     

P: 14SEP2023 156492    34.0N   97.0W 2.0-4.4 BAAAA  Southern Plains            

P: 17SEP2023 156492    35.0N   96.0W 2.0-4.3 AAAAA  Southern Plains            

 

O: 18SEP2023 14:34:40  40.2N   98.3W ML=3.4  EMSC   NEBRASKA                     

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

 

 

O: 16SEP2023 07:19:10  47.6N   70.2W MB=1.1  ECAN of La Malbaie, QC  

O: 16SEP2023 04:56:40  47.1N   70.9W MB=1.5  ECAN of Beaupr├⌐, QC   

O: 15SEP2023 10:45:39  46.9N   71.0W MB=1.6  ECAN of Ch├óteau-Richer, QC   

O: 16SEP2023 16:21:32  47.7N   70.2W MB=1.8  ECAN of Clermont, QC                

P: 16SEP2023 156521    47.3N   70.5W 2.0-4.0 AAAAA  New England                

 

O: 16SEP2023 20:29:43  46.8N   65.9W MB=1.8  ECAN of Blackville, NB              

P: 14SEP2023 156506    46.0N   66.0W 2.0-4.5 AAAAA  E. of Maine                

 

O: 18SEP2023 09:31:57  41.8N   81.0W MB=2.2  ECAN of Cleveland, OH   

O: 17SEP2023 17:04:37  41.8N   81.1W MB=2.4  ECAN of Cleveland, OH               

P: 14SEP2023 156528    41.8N   81.4W 2.0-3.9 BAAAA  Ohio/Lake Erie             

 

HAWAII

 

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

 

 

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                    

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 06:49:53  24.3N   90.2E ML=3.9  EMSC   BANGLADESH                   

P: 19SEP2023 156429    26.0N   93.0E 4.0-5.4 ABBAA  Myanmar                    

 

NEIC reported this earthquake of M 4.0 in Bangladesh was felt with intensity II-III in the area(s) of Bangladesh with IV in Dacca and II in Dhamrai and Maimansingh.

 

O: 17SEP2023 19:03:10  27.3N   87.4E ML=3.7  EMSC   NEPAL                        

P: 20SEP2023 156501    30.0N   88.0E 3.8-5.4 BCAAA  Xizang                     

 

O: 17SEP2023 16:23:35  38.8N   71.7E mb=4.6  EMSC   TAJIKISTAN                   

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

 

O: 17SEP2023 23:18:54  55.3N  164.7E mb=4.5  EMSC   KOMANDORSKIYE OSTROVA REGION 

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

 

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

 

INDONESIA AND PHILIPPINES

 

O: 18SEP2023 00:50:38   0.1S  123.5E ML=4.2  EMSC   SULAWESI, INDONESIA          

P: 14SEP2023 156374     1.0N  124.0E 4.0-5.5 BBAAA  Mindanao, Philippines      

 

O: 17SEP2023 19:33:32   3.3N  128.1E ML=4.1  EMSC   NORTH OF HALMAHERA, INDONESIA

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

 

O: 17SEP2023 22:20:40   5.2S  147.1E mb=4.1  EMSC   EASTERN NEW GUINEA REG., P.N.G

P: 16SEP2023 156390     5.0S  148.0E 4.0-5.4 AAAAA  New Ireland                

 

O: 17SEP2023 07:27:33   6.3S  103.8E ML=3.9  EMSC   SOUTHWEST OF SUMATRA, INDONESI

P: 15SEP2023 156398     7.0S  104.0E 4.0-5.4 AAAAA  So. of Sumatera            

 

O: 17SEP2023 20:49:09   7.5N  126.2E ML=4.1  EMSC   MINDANAO, PHILIPPINES        

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

 

O: 17SEP2023 10:56:15   8.4S  127.8E mb=4.4  EMSC   EAST TIMOR REGION            

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

 

O: 18SEP2023 02:54:05  13.2N  120.4E mb=4.9  EMSC   MINDORO, PHILIPPINES         

P: 18SEP2023 156409    13.0N  122.0E 3.5-4.9 AABAA  Luzon, Philippines         

 

NEIC reported this earthquake of M 4.9 in Mindoro, Philippines was felt with intensity II-III in the area(s) of Mindoro, Philippines in San Jose, Southern Tagalog.

 

 

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

 

CENTRAL AND SOUTH AMERICA

 

O: 17SEP2023 14:58:00  13.3N   90.2W ML=4.2  EMSC   OFFSHORE EL SALVADOR         

P: 15SEP2023 156406    14.0N   90.0W 3.5-5.4 AAAAA  Guatemala                  

 

O: 18SEP2023 04:03:24  14.4N   93.5W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

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

 

O: 18SEP2023 02:25:22  16.3N   98.3W ML=4.1  EMSC   OAXACA, MEXICO               

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

 

O: 17SEP2023 07:55:24  17.7N   81.6W mb=4.2  EMSC   CAYMAN ISLANDS REGION        

 

NEIC reported this earthquake of M 4.2 in the Cayman Islands was felt with intensity II-III in the area(s) of the Cayman Islands in Grand Cayman at George Town, Bodden Town and West Bay.

 

O: 17SEP2023 14:30:17  18.9N   66.8W MD=3.3  EMSC   PUERTO RICO REGION           

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

 

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

P: 16SEP2023 156422    20.0N   68.0W 3.0-4.6 AAAAA  Bahamas/No. Caribbean      

 

O: 17SEP2023 19:52:22  27.6N  111.6W ML=3.4  EMSC   GULF OF CALIFORNIA           

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

 

O: 17SEP2023 20:03:44  28.2S   71.2W mb=4.6  EMSC   OFFSHORE ATACAMA, CHILE      

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

 

O: 18SEP2023 01:37:23  31.6S   71.8W ML=3.2  EMSC   OFFSHORE COQUIMBO, CHILE     

P: 20SEP2023 156605    31.0S   72.0W 4.0-5.5 AAAAA  Central Chile              

 

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

 

AFRICA AND EUROPE

 

O: 17SEP2023 18:09:29   5.4S   34.9E mb=4.3  EMSC   TANZANIA                     

P: 12SEP2023 156386     6.0S   36.0E 4.0-5.5 AAAAA  Indian Ocean               

 

O: 17SEP2023 16:33:55  31.2N    8.1W mb=3.5  EMSC   MOROCCO                      

O: 17SEP2023 23:06:19  31.2N    8.8W ML=3.5  EMSC   MOROCCO

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

 

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                    

 

SOUTHWEST PACIFIC

 

O: 17SEP2023 11:53:59  10.2S  161.4E Mw=5.0  EMSC   SOLOMON ISLANDS              

P: 16SEP2023 156589    11.0S  163.0E 4.0-5.5 AABAA  Vanuatu Islands            

 

O: 17SEP2023 12:58:44  15.6S  168.2E mb=4.6  EMSC   VANUATU                      

P: 16SEP2023 156590    16.0S  168.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

OCEAN RIDGES

 

O: 18SEP2023 06:24:06  22.4S   69.0E mb=4.7  EMSC   MID-INDIAN RIDGE             

P: 13SEP2023 156598    29.0S   62.0E 4.0-5.6 BCCAA  So. Indian Ocean           

 

O: 17SEP2023 22:54:38  56.0S   27.1W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 14SEP2023 156623    55.0S   28.0W 4.0-5.9 BAAAA  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: 18SEP2023 03:43:22  28.6N  129.9E mb=4.7  EMSC   RYUKYU ISLANDS, JAPAN        

P: 16SEP2023 156432    28.0N  128.0E 4.0-5.4 AABAA  Ryukyu Islands             

P: 18SEP2023 156427    29.0N  131.0E 4.0-5.6 AAAAA  Kyushu Japan               

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 17SEP2023 16:52:11  31.4N  115.6W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO      

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

 

 

O: 17SEP2023 16:54:47  37.6N  122.5W md=2.3  ANSS   E of Pacifica CA             

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

 

O: 17SEP2023 19:04:42  38.4N  122.2W MD=2.1  EMSC   NORTHERN CALIFORNIA

O: 18SEP2023 06:20:53  38.8N  122.8W Mw=3.5  EMSC   NORTHERN CALIFORNIA

O: 17SEP2023 16:54:05  38.8N  122.8W MD=2.1  EMSC   NORTHERN CALIFORNIA          

P: 17SEP2023 156445    39.0N  123.1W 2.5-4.6 AAAAA  Central California         

 

NEIC reported this earthquake of M 3.5 in the California Geysers was felt with intensity II-III in the area(s) of the California Geysers with IV in Nice, Kelseyville and lesser shaking in Middletown, Cloverdale, Healdsburg, Lowe Lake, Calistoga, Windsor, Santa Rosa among others.

 

O: 18SEP2023 04:17:37  39.2N  120.1W ML=3.2  EMSC   NORTHERN CALIFORNIA          

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

 

NEIC reported this earthquake of M 3.4 in Northern California and Nevada was felt with intensity II-III in the area(s) of Northern California and Nevada in California at Carnelian Bay, Tahoe Vista, Kings Beach, Olympic Valley, Tahoe City, Truckee, Incline Village, Tahoma and in Nevada in Glenbrook among others.

 

 

ALASKA

 

O: 17SEP2023 20:16:52  57.1N  155.5W ML=3.0  EMSC   ALASKA PENINSULA             

P: 15SEP2023 156541    54.8N  158.7W 3.5-5.1 ACBAA  Alaska Peninsula           

 

O: 18SEP2023 06:09:43  60.3N  152.7W ML=3.4  EMSC   SOUTHERN ALASKA              

P: 18SEP2023 156568    60.2N  153.2W 3.2-5.2 AAAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.4 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska in West Kenai Peninsula.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

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           

 

O: 17SEP2023 07:08:53  47.7N  121.9W ML=2.5  EMSC   PUGET SOUND REGION, WASHINGTON

P: 19SEP2023 156539    48.9N  122.1W 2.0-3.9 ABAAA  Washington state, U.S.     

 

NEIC reported this earthquake of M 2.5 in Washington State was felt with intensity II-III in the area(s) of Washington State with maximum intensity IV in Seattle and lesser shaking in Fall City, Snoqualmie, Carnation, North Bend, Gold Bar, Bellevue, Spanaway among others.

 

ROCKY MOUNTAINS REGION

 

O: 17SEP2023 20:20:29  35.4N  113.2W ML=2.8  EMSC   ARIZONA                      

P: 20SEP2023 156473    34.7N  111.0W 2.0-4.3 BABAA  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 Prescott Valley.

 

O: 17SEP2023 13:15:52  44.3N  114.8W ML=2.2  EMSC   SOUTHERN IDAHO               

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

 

O: 17SEP2023 07:43:09  48.1N  115.2W ML=2.7  EMSC   WESTERN MONTANA              

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

 

EASTERN U.S./CANADA

 

O: 17SEP2023 21:58:32  35.9N   97.2W ML=2.1  EMSC   OKLAHOMA                     

P: 14SEP2023 156493    36.0N   97.0W 2.0-4.4 BAAAA  Southern Plains            

P: 17SEP2023 156492    35.0N   96.0W 2.0-4.3 AAAAA  Southern Plains            

 

HAWAII

 

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