MODERATE AFTERSHOCK SHAKES NORTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR MAY 12, 2023

 

 

The strongest earthquake in the U.S. or Canada today was an 5.2 in Northern California. NEIC reported this earthquake was felt with maximum intensity VI in Westwood, Californa, V in Greenville and Chester, California and IV in Quincy and Taylorsville and II-III in Forest Ranch, Mineral, Janesville, Magalia, Comptonville, Chico and as far as Reno and Las Vegas, Nevada. NEIC reported an aftershock of M 3.1 in Northern California was felt with intensity II-III in the area(s) of Northern California in Quincy. Other aftershocks were felt with intensity up to IV in California at Greenville, Susanville, Portola and in Reno, Nevada. A foreshock of M 2.6 occurred several hours earlier with intensity III in Rough and Ready, California. These are aftershocks of the M 5.5 in the area of May 11. This was discussed in part in the previous issue of this summary as:

 

"The strongest earthquake in the U.S. or Canada today was an 5.5 in Northern California. NEIC reported this earthquake was widely felt in northern California and Nevada with maximum intensity VI in Westwood, Chester and Greenville, Californa, V in Twain, Mineral,  California and IV in Quincy Meadow Valley, Forest Ranch, Janesville and Magalia and Taylorsville and II-III in Forest Ranch, Mineral, Janesville, Magalia, Comptonville, Chico and as far as Reno and Las Vegas, Nevada and in southern Oregon. This epicenter is near the fifth node (72 degrees) from the M 7.6 in Tonga yesterday.

...

 

The only event within about 150 km of today's epicenter with M>=5.5 in the past 35 years was an M 5.7 on May 24, 2013 within about 10 km of today's epicenter. It, like today's event, followed an M 7.4 in Tonga  of May 23, 2013.

 

 

This clearly suggests triggering in Northern California from these two events in Tonga. Forecasts 152966, 153162 and 153221 had expected this activity in

Northern California was likely around May 8-13 within about 100 km of today's epicenters. Following is a listing of aftershocks and mainshock today of M>=3. A more extensive listing is found under the "CALIFORNIA" regional listing below. Today's activity occurred near the fifth node (72 degrees) from the Tonga M 7.6 of May 10, 2023 and may have been promoted by energy from that source." (May 12, 2023)

 

Forecasts 153221 and 153241 had expected today's activity within about 50 km was likely around May 13, 2023. This activity is at 102 degrees from the M 7.8 in Turkey of February 6, 2023 and the M 7.2 in Tajikistan of February 23, 2023 and may have been promoted by energy from that source.

 

O: 12MAY2023 10:18:40  40.2N  121.1W Mw=5.2  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 11:18:04  40.2N  121.1W Mh=3.2  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 12:42:51  40.2N  121.1W ML=3.1  EMSC   NORTHERN CALIFORNIA

P: 13MAY2023 153221    40.4N  121.6W 2.5-4.8 AAAAA  California/Nevada area     

P: 13MAY2023 153241    40.6N  120.5W 2.5-4.8 AAAAA  Northern California        

 

 

The strongest earthquake in the U.S. or Canada today outside aftershocks in northern California occurred in the Northwest Territories of Canada with M 4.4. The last earthquake of equal or greater magnitude in the Northwest Territories, Canada within about 300 km of today's epicenter was an M 4.4 on June 16, 2022 but the only event in the region with greater magnitude in the past three years was an M 4.7 on October 24, 2020. A regional aftershock of M 4.3-4.4 occurred on November 17, 2020 at local solar noon. Forecast 153296 had expected today's activity was likely within about 100 km around May 13, 2023.

 

O: 12MAY2023 14:04:28  62.5N  126.6W MB=4.4  ECAN of Tungsten, NT                

O: 12MAY2023 14:04:27  62.6N  126.6W mb=3.7  EMSC   NORTHWEST TERRITORIES, CANADA

P: 13MAY2023 153296    62.1N  124.2W 2.5-4.4 AAAAA  Northwest Terr., Canada    

 

An earthquake of M 4.3 also occurred today in Southern Alaska. It was reported by NEIC to have been felt with intensity II-III in Anchorage, Tyonek, Kenai, Sterling, Alaska. Forecast 153289 had expected this event within about 50 km was likely around May 15, 2023.

 

O: 13MAY2023 03:53:56  61.1N  151.2W Mw=4.2  EMSC   SOUTHERN ALASKA              

P: 15MAY2023 153289    61.1N  150.2W 3.2-5.1 AAAAA  Central Alaska             

 

The strongest earthquake in the world today was an M 5.4 in Guam. NEIC reported it was felt with intensity II-III in Guam at Agat, Talofofo, Santa Rita, Yona, Hagatna, Mangilo and Tamuning. The last earthquake in Guam within about 200 km of today's epicenter with magnitude greater than or equal to M 5.4 was an M 5.7 on August 29, 2022. An M 5.5 also hit the region a year ago on May 15, 2022. This earthquake occurred at the start of solar flare 2202, the first C-class event of the day and may have been promoted by that flare and associated phenomena.

 

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

#-----

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

 

2200       0810   0821      0831   C2.0      (May 12, 2023)   2.1E-03  

 

Forecast 153136 had expected today's event in Guam within about 50 km of this epicenter was likely around May 12.

 

O: 12MAY2023 08:02:36  12.5N  144.1E mb=5.4  EMSC   GUAM REGION                  

O: 12MAY2023 15:01:52  12.5N  144.1E mb=5.1  EMSC   GUAM REGION

P: 12MAY2023 153136    13.0N  144.0E 4.0-5.4 AAAAA  So. Marianas/Guam          

 

An aftershock of M 4.6 also shook Central Turkey today.  Similar shocks have hit Turkey with M 4.6-4.7 on May 3 and May 5 but the last of significantly

larger magnitude occurred with the mainshock on February 6, 2023 (M 7.8). Today's earthquake occurred near local solar noon in conjunction with   Solar Flare 2200 and may have been promoted by SFE with that flare. This flare was also closely associated with the M 5.4 in Guam minutes earlier. Forecast 153212 had expected today's event was likely within about 50 km around May 12. This event is at 144 degrees from the M 7.6 in Tonga and was probably promoted by energy associated with that event. Other earthquake at this distance from Tonga in the past day occurred in the Central Mid-Atlantic, M 3.5 in Ukraine and in Ethiopia and Djibouti and were probably also excited by energy from Tonga. The 103 degree distance from Tonga was relatively quiet today with a moderate quake in Colombia. This distance passes through the Dominican Republic where moderate earthquakes continued today and may expand in the next several days as well as the South Sandwich Islands which saw an M 4.7 yesterday and area of Myanmar and

Sichuan, China among others.

 

O: 12MAY2023 08:33:21  37.9N   36.3E ML=4.6  EMSC   CENTRAL TURKEY               

P: 12MAY2023 153212    38.0N   36.0E 3.5-5.5 AAAAA  Turkey                     

 

 

 

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.6 in the area of Tonga May 10, 2023, where promoted seismicity is considered likely.

 

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 12MAY2023 17:30:20  23.2N  121.6E ML=4.7  EMSC   TAIWAN                       

O: 12MAY2023 17:01:20  23.2N  121.6E ML=4.7  TAI    Hualien, Taiwan              

P:  7MAY2023 152876    24.0N  122.0E 4.0-5.5 BAAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity IV in Taitung; III in Hualien and I in Nantou, Taichung, Kahsiung, Changhua, Yunlin, Chiayi, and Tainan Counties, Taiwan.

 

INDONESIA AND PHILIPPINES

 

O: 13MAY2023 05:46:08   9.3S  119.0E ML=4.3  EMSC   SUMBAWA REGION, INDONESIA    

P: 15MAY2023 153110     8.0S  119.0E 4.0-5.4 ABAAA  Sumbawa Island area        

P: 15MAY2023 153310    11.0S  119.0E 4.0-5.6 ABAAA  So. of Indonesia           

 

O: 13MAY2023 02:20:04  18.6N  147.6E mb=4.8  EMSC   MARIANA ISLANDS REGION       

P: 13MAY2023 153154    20.0N  146.0E 4.0-5.4 ABBAA  Volcano Islands            

 

O: 12MAY2023 08:02:36  12.5N  144.1E mb=5.4  EMSC   GUAM REGION                  

O: 12MAY2023 15:01:52  12.5N  144.1E mb=5.1  EMSC   GUAM REGION

P: 12MAY2023 153136    13.0N  144.0E 4.0-5.4 AAAAA  So. Marianas/Guam          

 

 

CENTRAL AND SOUTH AMERICA

 

O: 12MAY2023 13:40:20   6.0S   79.4W ML=4.0  EMSC   NEAR COAST OF NORTHERN PERU  

P: 10MAY2023 152819     6.0S   79.0W 4.0-5.6 AAAAA  No. Peru                   

 

O: 12MAY2023 09:45:29   7.1N   76.0W mb=4.6  EMSC   NORTHERN COLOMBIA            

P: 13MAY2023 153079     5.0N   78.0W 4.0-5.7 ACBAA  Colombia                   

P: 19MAY2023 153079     5.0N   76.0W 4.0-5.8 CCAAA  Colombia                   

 

NEIC reported this earthquake of M 4.6 in Colombia was felt with intensity II-III in the area(s) of Colombia in Antioquia at Medellin, Itagui and Envigado.

 

O: 12MAY2023 16:49:01   9.6N   82.8W ML=4.5  EMSC   PANAMA-COSTA RICA BORDER REGIO

O: 12MAY2023 22:18:30  10.1N   84.0W ML=4.2  EMSC   COSTA RICA                   

P: 13MAY2023 153117    10.0N   84.0W 3.5-5.4 AAAAA  Caribbean Sea              

 

O: 12MAY2023 09:06:45  13.6N   92.4W ML=4.1  EMSC   OFFSHORE GUATEMALA           

P: 13MAY2023 153118    15.0N   93.0W 3.5-5.3 ABAAA  Chiapas, Mexico            

 

O: 12MAY2023 17:29:46  14.3S   71.4W ML=4.2  EMSC   CENTRAL PERU                 

P: 13MAY2023 153302    15.0S   73.0W 4.0-5.4 AABAA  Central Peru               

 

O: 12MAY2023 09:08:46  16.4S   72.8W mb=4.7  EMSC   NEAR COAST OF SOUTHERN PERU  

P: 13MAY2023 153308    16.0S   72.0W 4.0-5.6 AAAAA  So. Peru/Bolivia           

 

O: 13MAY2023 04:45:10  18.2N   66.4W Md=3.1  EMSC   PUERTO RICO                  

P: 13MAY2023 153135    19.0N   66.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O: 12MAY2023 09:19:21  18.6N   70.3W ML=3.5  EMSC   DOMINICAN REPUBLIC            

P: 15MAY2023 153134    19.0N   71.0W 3.4-5.0 BAAAA  Puerto Rico                

 

O: 12MAY2023 13:38:17  18.9N   65.1W ML=3.5  EMSC   VIRGIN ISLANDS REGION        

P: 17MAY2023 153123    19.0N   64.0W 3.0-5.0 BAAAA  Leeward Islands            

 

O: 13MAY2023 04:51:24  38.0S   73.6W ML=5.0  EMSC   OFFSHORE BIO-BIO, CHILE      

P:  7MAY2023 153058    37.0S   74.0W 4.0-5.5 CAAAA  Central Chile              

P: 19MAY2023 153332    37.0S   74.0W 4.0-5.5 CAAAA  Central Chile              

 

NEIC reported this earthquake of M 4.6 in Araucania, Chile was felt with intensity II-III in the area(s) of Araucania, Chile in Temuco.

 

 

O: 12MAY2023 12:11:21  18.4N   68.9W Md=3.4  EMSC   DOMINICAN REPUBLIC REGION

O: 12MAY2023 07:37:09  19.2N   67.8W Md=3.4  EMSC   DOMINICAN REPUBLIC REGION    

O: 12MAY2023 07:10:36  19.3N   67.3W Md=3.4  EMSC   PUERTO RICO REGION           

P: 15MAY2023 153135    19.0N   67.0W 3.4-5.4 BAAAA  Puerto Rico                

 

O: 13MAY2023 04:11:12  26.5N  110.7W ML=4.0  EMSC   GULF OF CALIFORNIA

O: 13MAY2023 03:09:20  26.6N  110.8W ML=4.2  EMSC   GULF OF CALIFORNIA

O: 13MAY2023 03:19:33  26.6N  110.9W ML=4.4  EMSC   GULF OF CALIFORNIA

O: 13MAY2023 04:09:19  26.6N  110.8W ML=4.0  EMSC   GULF OF CALIFORNIA

O: 13MAY2023 04:46:34  26.6N  110.8W ML=4.2  EMSC   GULF OF CALIFORNIA

O: 13MAY2023 03:04:16  26.4N  111.0W mb=4.4  EMSC   GULF OF CALIFORNIA           

O: 12MAY2023 21:04:30  27.8N  111.9W ML=3.6  EMSC   GULF OF CALIFORNIA           

P: 13MAY2023 153143    28.0N  112.0W 3.5-5.0 AAAAA  Gulf of California         

 

AFRICA AND EUROPE

 

O: 12MAY2023 08:33:21  37.9N   36.3E ML=4.6  EMSC   CENTRAL TURKEY               

P: 12MAY2023 153212    38.0N   36.0E 3.5-5.5 AAAAA  Turkey                     

 

O: 13MAY2023 01:52:04  49.6N   27.0E ML=3.4  EMSC   UKRAINE                      

P: 17MAY2023 153251    46.0N   26.0E 3.0-5.0 BCAAA  Romania/NW Turkey          

 

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

 

SOUTHWEST PACIFIC

 

O: 12MAY2023 20:02:16  19.0S  169.5E mb=4.6  EMSC   VANUATU                      

P: 19MAY2023 153314    19.0S  170.0E 4.0-5.6 CAAAA  Vanuatu Islands            

 

O: 12MAY2023 13:24:41  19.4S  173.4W mb=4.8  EMSC   TONGA                        

P: 19MAY2023 153312    19.0S  174.0W 4.0-5.7 CAAAA  Tonga Islands              

 

O: 12MAY2023 21:46:41  24.5S  175.8W mb=5.2  EMSC   SOUTH OF TONGA               

P:  7MAY2023 153051    24.0S  176.0W 4.0-5.4 BAAAA  Tonga Islands              

 

OCEAN RIDGES

 

 

O: 12MAY2023 08:37:05  41.2S   87.8W mb=4.9  EMSC   WEST CHILE RISE              

P: 13MAY2023 153339    41.0S   88.0W 4.0-5.6 AAAAA  Chile Rise                 

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 12MAY2023 18:20:09  18.2S  120.3E ML=4.3  EMSC   WESTERN AUSTRALIA            

O: 12MAY2023 18:20:09  18.2S  120.3E mb=4.5  ANSS   Cable Beach Australia

 

O: 13MAY2023 05:41:42  29.6S  178.9W mb=4.6  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 13MAY2023 153320    29.0S  178.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

O: 12MAY2023 13:27:45  32.4S  179.9E ML=4.2  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 10MAY2023 153060    35.0S  179.0E 3.0-4.4 ACAAA  North Island, N.Z.         

 

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

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

 

JAPAN AND KURIL ISLANDS

 

O: 13MAY2023 07:10:31  30.0N  129.9E Mw=5.3  EMSC   RYUKYU ISLANDS, JAPAN        

P: 13MAY2023 153152    29.0N  129.0E 4.0-5.5 AAAAA  Ryukyu Islands             

 

O: 12MAY2023 12:45:06  33.6N  132.4E mb=4.3  EMSC   SHIKOKU, JAPAN               

P: 16MAY2023 153175    31.0N  132.0E 3.5-4.9 BCAAA  Kyushu, Japan area         

 

NEIC reported this earthquake of M 4.3 in Shikoku, Japan was felt with intensity II-III in the area(s) of Shikoku, Japan in Ehime, Yamaguchi and Hiroshima Prefectures.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 13MAY2023 00:08:13  32.3N  115.1W Ml=2.2  EMSC   BAJA CALIFORNIA, MEXICO      

P: 12MAY2023 153194    32.5N  115.7W 2.5-4.6 AAAAA  So. California             

 

O: 12MAY2023 17:30:46  33.9N  116.8W ML=2.6  EMSC   SOUTHERN CALIFORNIA

O: 12MAY2023 20:39:51  33.5N  116.7W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P: 14MAY2023 153199    33.9N  116.9W 2.5-4.8 AAAAA  So. California             

 

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

 

O: 12MAY2023 20:57:30  35.7N  121.3W ML=2.6  EMSC   CENTRAL CALIFORNIA

O: 12MAY2023 20:57:31  35.7N  121.3W md=2.9  ANSS   San Simeon CA

O: 12MAY2023 20:57:24  35.7N  121.2W ml=2.9  ANSS   San Simeon CA

O: 13MAY2023 04:40:02  35.8N  121.3W Md=2.4  EMSC   CENTRAL CALIFORNIA           

P: 18MAY2023 153189    35.7N  121.2W 2.5-4.4 BAAAA  Off So. California         

 

NEIC reported this earthquake of M 2.9  in Central California was felt with intensity II-III in the area(s) of Central California in Los Banos.

 

O: 12MAY2023 21:51:33  38.2N  117.9W ml=2.4  EMSC   NEVADA                       

P: 17MAY2023 153161    38.2N  118.1W 2.5-4.5 BAAAA  California/Nevada area     

 

O: 12MAY2023 09:15:38  38.6N  122.6W Md=2.3  EMSC   NORTHERN CALIFORNIA          

P:  8MAY2023 152888    38.8N  122.8W 2.5-4.6 BAAAA  Central California         

 

O: 12MAY2023 15:46:11  38.8N  122.8W Md=2.0  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 18:21:06  38.8N  122.8W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 18:21:06  38.8N  122.8W Md=2.4  EMSC   NORTHERN CALIFORNIA

 

O: 12MAY2023 11:54:56  40.1N  121.1W Md=2.3  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 08:20:48  40.2N  121.2W ML=2.2  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 08:38:38  40.2N  121.2W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 10:18:40  40.2N  121.1W Mw=5.2  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 10:28:20  40.2N  121.1W ml=2.1  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 10:32:29  40.2N  121.1W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 10:38:46  40.2N  121.1W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 10:41:48  40.2N  121.1W MD=2.2  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 10:51:55  40.2N  121.1W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 10:54:36  40.2N  121.2W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 11:18:04  40.2N  121.1W Mh=3.2  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 11:23:03  40.2N  121.1W ML=2.4  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 12:32:17  40.2N  121.1W ML=2.6  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 12:42:51  40.2N  121.1W ML=3.1  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 13:12:55  40.2N  121.1W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 13:29:55  40.2N  121.2W ML=2.7  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 13:31:06  40.2N  121.1W MD=2.1  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 13:44:35  40.2N  121.1W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 13:50:47  40.2N  121.1W MD=2.9  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 14:16:33  40.2N  121.1W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 15:24:15  40.2N  121.1W ML=2.8  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 16:35:20  40.2N  121.1W Md=2.5  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 16:51:25  40.2N  121.1W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 13MAY2023 02:35:47  40.2N  121.1W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 13MAY2023 03:20:04  40.2N  121.1W Md=2.3  EMSC   NORTHERN CALIFORNIA

O: 13MAY2023 04:30:41  40.2N  121.2W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 13MAY2023 05:24:09  40.2N  121.2W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 13MAY2023 01:58:26  40.3N  121.2W Md=2.3  EMSC   NORTHERN CALIFORNIA          

P: 13MAY2023 153221    40.4N  121.6W 2.5-4.8 AAAAA  California/Nevada area     

P: 13MAY2023 153241    40.6N  120.5W 2.5-4.8 AAAAA  Northern California        

 

ALASKA

 

O: 12MAY2023 17:04:28  52.5N  172.1W mb=3.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 15MAY2023 153265    52.1N  172.8W 3.5-4.9 BAAAA  Andreanoff Isls, Aleutians 

 

O: 13MAY2023 02:27:39  58.3N  155.2W ML=4.2  EMSC   ALASKA PENINSULA             

P: 15MAY2023 153288    60.3N  153.0W 3.2-5.0 ABAAA  Central Alaska             

 

O: 13MAY2023 03:53:56  61.1N  151.2W Mw=4.2  EMSC   SOUTHERN ALASKA              

P: 15MAY2023 153289    61.1N  150.2W 3.2-5.1 AAAAA  Central Alaska             

 

O: 12MAY2023 08:39:43  61.6N  148.9W ML=3.5  EMSC   SOUTHERN ALASKA              

P:  9MAY2023 153009    61.0N  147.7W 3.2-4.9 BAAAA  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 Chugiak, Eagle River, Wasilla, Palmer, Elmendorf AFB, Anchorage.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 12MAY2023 16:55:22  48.5N  123.4W Ml=2.2  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 14MAY2023 153256    48.4N  123.2W 2.0-4.3 AAAAA  Washington state, U.S.     

 

O: 12MAY2023 14:04:28  62.5N  126.6W MB=4.4  ECAN of Tungsten, NT                

O: 12MAY2023 14:04:27  62.6N  126.6W mb=3.7  EMSC   NORTHWEST TERRITORIES, CANADA

P: 13MAY2023 153296    62.1N  124.2W 2.5-4.4 AAAAA  Northwest Terr., Canada    

 

ROCKY MOUNTAINS REGION

 

O: 12MAY2023 11:13:48  44.3N  114.8W Ml=2.0  EMSC   SOUTHERN IDAHO               

P: 15MAY2023 153235    44.6N  116.0W 2.0-3.9 BAAAA  Montana/Idaho              

 

O: 12MAY2023 10:49:11  31.5N  104.0W ML=2.4  EMSC   WESTERN TEXAS

O: 12MAY2023 07:40:00  31.6N  104.1W ML=2.7  EMSC   WESTERN TEXAS

O: 12MAY2023 19:05:51  31.7N  104.6W ML=2.5  EMSC   WESTERN TEXAS

O: 13MAY2023 06:27:54  31.7N  104.4W ML=2.9  EMSC   WESTERN TEXAS

O: 12MAY2023 07:44:14  31.5N  104.2W ML=2.4  EMSC   WESTERN TEXAS                

P: 12MAY2023 153191    32.5N  104.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

NEIC reported this earthquake of M 2.9 in Western Texas was felt with intensity II-III in the area(s) of Western Texas in Odessa.

Note that the M 2.9 occurred within minutes of local solar midnight. An M 2.5 aftershock

occurred with a minute of local solar noon. These may have been promoted

by strong tidal stresses which maximize near this hour.

 

EASTERN U.S./CANADA

 

O: 12MAY2023 09:33:50  36.5N   89.6W Md=2.2  EMSC   SOUTHEASTERN MISSOURI        

P:  8MAY2023 152903    38.0N   89.0W 2.0-3.9 BBAAA  New Madrid area            

 

O: 13MAY2023 00:22:34  39.2N   99.5W mb=2.5  EMSC   KANSAS                       

P: 17MAY2023 153209    39.0N   99.0W 2.0-4.1 BAAAA  Southern Plains            

 

NEIC reported this earthquake of M 2.5 in Kansas was felt with intensity II-III in the area(s) of Kansas in Palco and Wichita.

 

HAWAII

 

O: 13MAY2023 02:24:20  19.2N  155.5W ML=3.7  EMSC   ISLAND OF HAWAII, HAWAII     

O: 12MAY2023 14:26:25  19.3N  155.4W ML=3.7  EMSC   ISLAND OF HAWAII, HAWAII     

P: 14MAY2023 153144    19.3N  155.1W 4.0-5.6 AAAAA  Hawaii area                

 

NEIC reported this earthquake of M 3.5 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Naalehu, Captain Cook, Kailua Kona, Kamuela.

An M 3.4 was also reported felt in Hawaii in Volcano, Naalehu and Keaau with intensity III today.

 

MODERATE QUAKE IN CALIFORNIA REPEATS TONGA/CALIFORNIA SET FROM MAY, 2013

 

EARTHQUAKE SUMMARY FOR MAY 11, 2023

 

 

The strongest earthquake in the U.S. or Canada today was an 5.5 in Northern California. NEIC reported this earthquake was widely felt in northern California and Nevada with maximum intensity VI in Westwood, Chester and Greenville, Californa, V in Twain, Mineral,  California and IV in Quincy Meadow Valley, Forest Ranch, Janesville and Magalia and Taylorsville and II-III in Forest Ranch, Mineral, Janesville, Magalia, Comptonville, Chico and as far as Reno and Las Vegas, Nevada and in southern Oregon. This epicenter is near the fifth node (72 degrees) from the M 7.6 in Tonga yesterday. This possibility had been addressed in the previous issue of this summary as:

 

 

"Likely far-field activity from northern Tonga was identified in this  summary in early February, 2023 as (among others):

 

(72 degrees) Tonga to Northern California, Baja California, Rat Islands, Fox Islands, Andreanof Islands, Kuril Islands,  South of Sumatra, Coast of Oregon, " (May 11, 2023)

 

The only event within about 150 km of today's epicenter with M>=5.5 in the past 35 years was an M 5.7 on May 24, 2013 within about 10 km of today's epicenter. It, like today's event, followed an M 7.4 in Tonga  of May 23, 2013. At the time this summary noted:

 

"A moderately strong earthquake of M 5.7 hit northern California today and was felt throughout most of the states of California, Nevada and Oregon. Maximum intensity in Nevada occurred with intensity III in Reno, Sparks, Virginia

City, Carson City among many others. In California the maximum intensity was listed by NEIC as VII. This occurred in the Greenville and Twain areas. Intensity V was felt out to about 100 km from the epicenter; IV to about 150 km and III within about 200 km of the quake. A good deal of minor damage occurred in the epicentral area as windows broke and items fell and were thrown about by the shaking. There were no immediate reports of major damage. In Oregon the maximum intensity occurred with III at Klamath Falls, Bonanza and Lakeview.

 

...

 

A strong aftershock sequence is continuing in the area and many of the events of M>3 are being felt with intensity III-IV. This is the largest earthquake to hit northern or central California, Nevada or Oregon in 19 years - since an M 6.1 on the California-Nevada border on September 12, 1994. The Klamath Falls quake of September 21, 1993 was a pair of M 6.0 and 6.1 quakes was the last similar event in this region within 200 km of the epicenter. The last significant earthquake within 100 km of the epicenter was the  M 5.7 Oroville Dam earthquake of August 1, 1975." (May 24, 2013)

 

The earthquake in Tonga on May 23, 2013 of M 7.4 was the strongest in the region of Tonga in the past 25 years at an intermediate focal depth (70-400 km depth).   Several others of larger or equal magnitude have occurred at depths near 600 km (deep focus) or at shallow focus (depth <60 km) in this time period. The correspondence between the pair of events in Tonga in 2013 and those today is remarkable as shown in the parameters recorded by NEIC:

 

MO DA HR MN SC YEAR    LAT      LONG    DEPTH MAG

05 23 17 19 04 2013   -23.009  -177.232 173.7 7.4 TONGA

05 24 03 47 08 2013    40.192  -121.060   9.7 5.7 NORTHERN CALIFORNIA

 

and

 

 5 10 16  2  0 2023   -15.600  -174.608 210.1 7.6 TONGA

 5 11 23 19 41 2023    40.204  -121.110   5.9 5.5 NORTHERN CALIFORNIA

 

This clearly suggests triggering in Northern California from these two events in Tonga. Forecasts 152966, 153162 and 153221 had expected this activity in  Northern California was likely around May 8-13 within about 100 km of today's epicenters. Following is a listing of aftershocks and mainshock today of M>=3. A more extensive listing is found under the "CALIFORNIA" regional listing below. Today's activity occurred near the fifth node (72 degrees) from the Tonga M 7.6 of May 10, 2023 and may have been promoted by energy from that source.

 

O: 12MAY2023 00:06:55  40.2N  121.2W ML=3.0  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 02:54:45  40.2N  121.1W Mw=3.8  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 05:45:40  40.2N  121.1W MD=3.0  EMSC   NORTHERN CALIFORNIA

O: 11MAY2023 23:19:41  40.2N  121.1W Mw=5.4  EMSC   NORTHERN CALIFORNIA          

O: 11MAY2023 23:19:41  40.2N  121.1W Mw=5.5  ANSS   NORTHERN CALIFORNIA          

P:  8MAY2023 152966    40.7N  122.3W 2.5-4.6 BAAAA  Northern California        

P: 13MAY2023 153221    40.4N  121.6W 2.5-4.8 AAAAA  California/Nevada area     

 

The strongest earthquake in the world today was an M 5.9 in the southern Ryukyu Islands, Japan northeast of Taiwan.  Like the earthquakes in Northern California today, this epicenter is also near the fifth node (72 degrees) from the M 7.6 in Tonga  yesterday and may have been promoted by energy from that source. The M 5.9 is the strongest earthquake within about 150 km of this epicenter in the southwestern Ryukyu Islands since an M 5.9 on December 26, 2021 and an M 6.6 on November 10, 2021. Forecast 153151 had expected enhanced seismicity in this region was likely around May 14.

 

O: 11MAY2023 13:33:16  24.3N  125.2E Mw=5.9  EMSC   SOUTHWESTERN RYUKYU ISL., JAPA

O: 11MAY2023 13:50:09  24.3N  125.3E mb=4.8  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

P: 14MAY2023 153151    25.0N  124.0E 4.0-5.4 BAAAA  Ryukyu Islands             

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.6 in the area of Tonga May 10, 2023, where promoted seismicity is considered likely.

 

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 11MAY2023 18:34:06  29.7N  102.1E Mw=4.9  EMSC   WESTERN SICHUAN, CHINA

O: 11MAY2023 20:32:13  29.7N  102.2E mb=4.7  EMSC   WESTERN SICHUAN, CHINA

O: 11MAY2023 22:07:05  29.5N  102.1E mb=4.4  EMSC   WESTERN SICHUAN, CHINA       

P: 14MAY2023 153149    26.0N  101.0E 4.0-5.4 BCAAA  Myanmar                    

P: 15MAY2023 153149    27.0N  104.0E 4.0-5.7 BCBAA  Myanmar                    

 

O: 11MAY2023 20:44:52  21.7N   93.1E mb=4.7  EMSC   MYANMAR                      

P:  3MAY2023 152867    23.0N   94.0E 4.0-5.4 CAAAA  Myanmar                    

 

O: 11MAY2023 21:25:17  21.8N  121.0E mb=4.6  EMSC   TAIWAN REGION                

O: 11MAY2023 21:25:18  21.7N  121.0E ML=4.4  TAI    Hualien, Taiwan              

P:  6MAY2023 152875    22.0N  121.0E 4.0-5.4 BAAAA  Taiwan                     

CWB reported this earthquake was felt with intensity II in Taitung and Pingtung Counties, Taiwan.

 

O: 11MAY2023 21:38:56  36.5N   71.0E mb=4.0  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 13MAY2023 153171    37.0N   70.0E 3.8-5.4 AAAAA  Hindu Kush/Pakistan        

 

O: 11MAY2023 13:07:28  39.8N   70.2E mb=4.2  EMSC   KYRGYZSTAN                   

P: 13MAY2023 153171    37.0N   70.0E 3.8-5.4 ACAAA  Hindu Kush/Pakistan        

 

O: 11MAY2023 12:03:19  55.3N  163.1E mb=5.0  EMSC   OFF EAST COAST OF KAMCHATKA  

O: 11MAY2023 16:26:29  55.4N  163.1E mb=4.7  EMSC   OFF EAST COAST OF KAMCHATKA

P: 14MAY2023 153272    55.0N  163.0E 4.0-6.0 BAAAA  Komandorsky Isl            

 

INDONESIA AND PHILIPPINES

 

O: 11MAY2023 14:36:37   1.3N   97.1E mb=4.9  EMSC   NIAS REGION, INDONESIA       

P:  9MAY2023 152803     1.0N   98.0E 4.0-5.6 AAAAA  So. Sumatera               

 

O: 12MAY2023 05:11:32   3.1N  127.9E ML=4.0  EMSC   KEPULAUAN TALAUD, INDONESIA  

P: 10MAY2023 152797     2.0N  128.0E 4.0-5.7 ABAAA  Halmahera                  

 

O: 12MAY2023 02:17:07   4.7S  134.1E ML=4.2  EMSC   NEAR S COAST OF PAPUA, INDONES

P: 14MAY2023 153112     3.0S  134.0E 4.0-5.4 ABAAA  West Irian, PNG            

 

O: 11MAY2023 16:04:18   6.4S  104.9E ML=4.4  EMSC   SUNDA STRAIT, INDONESIA      

P: 12MAY2023 153108     7.0S  104.0E 4.0-5.4 AAAAA  So. of Sumatera            

 

O: 11MAY2023 21:56:38   8.4S  109.0E ML=4.4  EMSC   JAVA, INDONESIA              

P: 13MAY2023 153106     9.0S  109.0E 4.0-5.6 AAAAA  So. of Java                

 

O: 12MAY2023 04:34:49  10.1N  126.3E mb=4.6  EMSC   PHILIPPINE ISLANDS REGION    

P: 15MAY2023 153124    10.0N  126.0E 3.5-5.3 BAAAA  Luzon, Philippines         

 

O: 12MAY2023 02:38:08  17.3N  120.5E mb=4.4  EMSC   LUZON, PHILIPPINES           

P: 13MAY2023 153125    17.0N  121.0E 3.5-4.9 AAAAA  Luzon, Philippines         

 

CENTRAL AND SOUTH AMERICA

 

O: 12MAY2023 03:01:57  16.1N   91.1W ML=4.0  EMSC   CHIAPAS, MEXICO              

P: 14MAY2023 153120    16.0N   92.0W 3.5-5.2 AAAAA  Guatemala                  

 

O: 12MAY2023 00:18:27  14.7N   93.3W ML=4.5  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 13MAY2023 153118    15.0N   93.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 11MAY2023 08:41:44   4.5N   87.2W mb=4.2  EMSC   OFF COAST OF CENTRAL AMERICA 

P: 10MAY2023 152795     5.0N   83.0W 3.5-5.3 AACAA  Costa Rica                 

 

O: 11MAY2023 11:34:10   4.9S   78.8W ML=4.6  EMSC   PERU-ECUADOR BORDER REGION   

P: 10MAY2023 152819     6.0S   79.0W 4.0-5.6 ABAAA  No. Peru                   

 

O: 12MAY2023 06:06:17   0.8N   78.1W mb=4.5  EMSC   COLOMBIA-ECUADOR BORDER REGION

P: 14MAY2023 153095     1.0S   77.0W 4.0-5.4 ABAAA  Ecuador                    

 

O: 12MAY2023 01:23:27  17.6S   69.7W mb=4.3  EMSC   SOUTHERN PERU                

P: 16MAY2023 153309    18.0S   70.0W 4.0-5.6 BAAAA  So. Peru/Bolivia           

 

O: 12MAY2023 01:02:09  18.1N   65.1W Md=3.0  EMSC   VIRGIN ISLANDS REGION        

P: 13MAY2023 153135    19.0N   66.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O: 12MAY2023 06:59:56  18.6N  103.0W ML=4.0  EMSC   MICHOACAN, MEXICO            

P: 13MAY2023 153128    19.0N  104.0W 3.5-5.3 AAAAA  Michoacan, Mexico          

 

O: 11MAY2023 07:01:58  19.2N   67.8W Md=3.8  EMSC   DOMINICAN REPUBLIC REGION

O: 12MAY2023 04:10:44  19.1N   66.8W Md=3.8  EMSC   PUERTO RICO REGION

O: 11MAY2023 19:27:04  19.0N   67.1W Md=3.7  EMSC   PUERTO RICO REGION           

P: 13MAY2023 153135    19.0N   66.0W 3.4-5.3 AAAAA  Puerto Rico                

P: 15MAY2023 153135    19.0N   67.0W 3.4-5.4 BAAAA  Puerto Rico                

 

NEIC reported this earthquake of M 3.7 in Puerto Rico was felt with intensity II-III in the area(s) of Puerto Rico in Moca.

 

O: 11MAY2023 10:50:17  19.1N   64.8W Md=3.6  EMSC   VIRGIN ISLANDS REGION

O: 11MAY2023 09:15:23  19.3N   64.8W Md=3.5  EMSC   VIRGIN ISLANDS REGION        

P: 14MAY2023 153138    20.0N   64.0W 3.0-4.9 BAAAA  Bahamas/No. Caribbean      

 

O: 11MAY2023 16:52:57  19.3S   69.8W mb=4.0  EMSC   TARAPACA, CHILE               

P: 14MAY2023 153326    20.0S   70.0W 4.0-5.9 BAAAA  So. Peru/Bolivia           

 

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

 

O: 11MAY2023 23:09:54  19.7N   70.7W ML=3.2  EMSC   DOMINICAN REPUBLIC           

P: 15MAY2023 153134    19.0N   71.0W 3.4-5.0 BAAAA  Puerto Rico                

 

O: 11MAY2023 09:14:44  20.5S   68.8W mb=4.2  EMSC   TARAPACA, CHILE              

P: 14MAY2023 153326    20.0S   70.0W 4.0-5.9 BAAAA  So. Peru/Bolivia           

 

O: 11MAY2023 18:31:42  10.2N   63.6W mb=4.9  EMSC   SUCRE, VENEZUELA             

P: 13MAY2023 153137    11.0N   62.0W 3.4-5.1 AABAA  Windward Islands           

 

NEIC reported this earthquake of M 4.9 in Northern Venezuela was felt with intensity II-III in the area(s) of Northern Venezuela in Maturin and Cumana, Sucre with intensity IV.

 

O: 11MAY2023 22:33:00  22.2S   70.0W ML=4.2  EMSC   ANTOFAGASTA, CHILE           

P: 15MAY2023 153315    22.0S   67.0W 4.0-5.9 BACAA  Argentina                  

 

O: 11MAY2023 16:32:55  23.0N  100.1W ML=4.2  EMSC   SAN LUIS POTOSI, MEXICO      

P: 10MAY2023 152870    20.0N   99.0W 3.0-4.6 ACAAA  Northern Mexico            

 

AFRICA AND EUROPE

 

O: 11MAY2023 15:45:46  76.6N    7.2E Mw=3.8  EMSC   SVALBARD REGION              

P: 13MAY2023 153299    79.0N    7.0E 4.0-5.7 ACAAA  Arctic Ocean Region        

 

O: 11MAY2023 22:11:50  34.9N   15.1E ML=4.4  EMSC   CENTRAL MEDITERRANEAN SEA    

P: 15MAY2023 153176    39.0N   14.0E 3.0-4.9 BCAAA  Mediterranean/Sicily       

 

SOUTHWEST PACIFIC

 

O: 11MAY2023 06:47:24  15.6S  174.7W mb=4.3  EMSC   TONGA                        

P: 15MAY2023 153312    16.0S  174.0W 4.0-6.1 BAAAA  Tonga Islands              

 

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

 

OCEAN RIDGES

 

O: 12MAY2023 02:08:35  11.6N   45.5E mb=4.4  EMSC   GULF OF ADEN                 

P: 10MAY2023 152836    13.0N   40.0E 3.5-5.0 ABCAA  Ethiopia                    

 

O: 11MAY2023 16:20:49   2.3N   30.8W mb=4.6  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 18MAY2023 153077     1.0N   29.0W 4.0-5.8 CBBAA  Central Mid-Atlantic Ridg  

 

O: 12MAY2023 06:19:20  58.8S   25.2W mb=4.6  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 17MAY2023 153347    59.0S   26.0W 4.0-6.1 BAAAA  So. Sandwich Islands       

 

O: 11MAY2023 15:45:46  76.6N    7.2E Mw=3.8  EMSC   SVALBARD REGION              

P: 13MAY2023 153299    79.0N    7.0E 4.0-5.7 ACAAA  Arctic Ocean Region        

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 11MAY2023 17:08:38  32.3S  178.8E ML=4.5  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  7MAY2023 153064    34.0S  180.0W 4.0-5.4 BBAAA  So. Kermadec Islands       

 

JAPAN AND KURIL ISLANDS

 

O: 11MAY2023 13:33:16  24.3N  125.2E Mw=5.9  EMSC   SOUTHWESTERN RYUKYU ISL., JAPA

O: 11MAY2023 13:50:09  24.3N  125.3E mb=4.8  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

P: 14MAY2023 153151    25.0N  124.0E 4.0-5.4 BAAAA  Ryukyu Islands             

 

O: 12MAY2023 06:05:43  35.6N  139.3E mb=4.1  EMSC   NEAR S. COAST OF HONSHU, JAPAN

P:  9MAY2023 152912    34.0N  140.0E 4.0-5.4 BBAAA  Off East Coast Honshu      

P: 13MAY2023 153186    35.0N  142.0E 4.0-5.6 AABAA  Off East Coast Honshu      

 

O: 11MAY2023 09:52:44  42.4N  143.0E Mw=5.2  EMSC   HOKKAIDO, JAPAN REGION       

P: 12MAY2023 153226    42.0N  142.0E 3.5-5.5 AAAAA  Hokkaido, Japan            

 

NEIC reported this earthquake of M 5.2 in Hokkaido, Japan was felt with intensity II-III in the area(s) of Hokkaido, Japan in Sapporo and Nanae.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 11MAY2023 18:26:50  33.4N  116.9W Ml=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 14MAY2023 153199    33.9N  116.9W 2.5-4.8 BAAAA  So. California             

 

O: 11MAY2023 23:49:15  38.0N  118.7W MD=2.2  EMSC   CENTRAL CALIFORNIA           

P: 16MAY2023 153161    37.8N  118.2W 2.5-4.8 BAAAA  California/Nevada area     

 

O: 11MAY2023 07:39:35  40.6N  124.2W Md=2.0  EMSC   NORTHERN CALIFORNIA          

O: 11MAY2023 07:42:21  40.5N  124.4W Md=2.9  EMSC   OFFSHORE NORTHERN CALIFORNIA

P:  8MAY2023 152968    40.7N  124.6W 2.5-4.4 BAAAA  Off Coast of No. Calif     

 

NEIC reported this earthquake of M 2.9 off Northern California  was felt with intensity II-III in the area(s) of Northern California in Fortuna and Eureka.

 

 

O: 11MAY2023 23:23:48  40.2N  121.2W Ml=2.8  EMSC   NORTHERN CALIFORNIA

O: 11MAY2023 23:26:03  40.2N  121.1W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 11MAY2023 23:29:42  40.2N  121.1W ML=2.5  EMSC   NORTHERN CALIFORNIA

O: 11MAY2023 23:34:53  40.2N  121.1W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 11MAY2023 23:38:29  40.2N  121.1W ML=2.4  EMSC   NORTHERN CALIFORNIA

O: 11MAY2023 23:45:14  40.2N  121.2W ML=2.2  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 00:06:55  40.2N  121.2W ML=3.0  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 00:10:17  40.2N  121.1W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 00:30:12  40.2N  121.1W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 00:32:21  40.2N  121.1W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 00:38:46  40.2N  121.2W MD=2.8  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 00:53:12  40.2N  121.2W ML=2.0  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 00:55:17  40.2N  121.2W Md=2.3  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 01:58:57  40.2N  121.1W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 02:05:35  40.2N  121.1W Md=2.3  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 02:18:59  40.2N  121.1W MD=2.5  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 02:40:37  40.2N  121.2W MD=2.9  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 02:54:45  40.2N  121.1W Mw=3.8  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 03:42:49  40.2N  121.1W Md=2.3  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 04:12:25  40.2N  121.1W Md=2.3  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 05:17:16  40.2N  121.1W ML=2.7  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 05:37:46  40.2N  121.1W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 05:41:06  40.2N  121.1W Md=2.4  EMSC   NORTHERN CALIFORNIA

O: 12MAY2023 05:45:40  40.2N  121.1W MD=3.0  EMSC   NORTHERN CALIFORNIA

O: 11MAY2023 23:19:41  40.2N  121.1W Mw=5.4  EMSC   NORTHERN CALIFORNIA          

P:  8MAY2023 152966    40.7N  122.3W 2.5-4.6 BAAAA  Northern California        

P: 12MAY2023 153162    39.3N  120.0W 2.5-4.6 AAAAA  California/Nevada area     

P: 13MAY2023 153221    40.4N  121.6W 2.5-4.8 AAAAA  California/Nevada area     

 

ALASKA

 

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

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 11MAY2023 17:16:36  47.5N  123.3W Ml=2.6  EMSC   OLYMPIC PENINSULA, WASHINGTON

P: 14MAY2023 153256    48.4N  123.2W 2.0-4.3 BAAAA  Washington state, U.S.     

 

NEIC reported this earthquake of M 2.6  in the Olympic Peninsula, Washington was felt with intensity II-III in the area(s) of the Olympic Peninsula, Washington in Bremerton.

 

ROCKY MOUNTAINS REGION

 

O: 11MAY2023 07:47:59  44.3N  114.9W Ml=2.0  EMSC   SOUTHERN IDAHO               

P:  6MAY2023 152958    44.5N  115.2W 2.0-3.9 BAAAA  Montana/Idaho              

 

O: 11MAY2023 22:25:27  44.8N  111.0W Ml=2.4  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 14MAY2023 153258    44.6N  110.8W 2.0-4.2 BAAAA  Yellowstone/Wyoming        

 

O: 11MAY2023 22:49:55  31.5N  104.2W ML=2.0  EMSC   WESTERN TEXAS

O: 12MAY2023 02:54:30  31.5N  104.2W ML=2.8  EMSC   WESTERN TEXAS

O: 12MAY2023 05:13:05  31.5N  104.2W ML=2.4  EMSC   WESTERN TEXAS

O: 12MAY2023 06:49:51  31.5N  104.2W ML=2.7  EMSC   WESTERN TEXAS

O: 11MAY2023 21:45:32  31.6N  104.0W ML=2.1  EMSC   WESTERN TEXAS

O: 11MAY2023 07:31:20  31.5N  104.2W ML=3.6  EMSC   WESTERN TEXAS                

P:  9MAY2023 152915    32.5N  104.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 11MAY2023 22:42:50  34.5N   97.2W ML=2.1  EMSC   OKLAHOMA

O: 11MAY2023 15:58:29  34.5N   97.2W ML=2.3  EMSC   OKLAHOMA                     

P: 16MAY2023 153207    34.0N   96.0W 2.0-4.3 BAAAA  Southern Plains            

 

O: 12MAY2023 03:23:23  47.7N   70.2W MB=0.5  ECAN of La Malbaie, QC              

P:  6MAY2023 152956    47.0N   69.0W 2.0-4.4 CAAAA  Maine                      

P: 20MAY2023 153238    47.3N   70.5W 2.0-4.4 CAAAA  New England                 

 

O: 11MAY2023 09:45:20  48.4N  129.1W MB=3.1  ECAN of Tofino, BC                  

P: 14MAY2023 153255    48.9N  129.3W 2.8-4.9 BAAAA  Vancouver Island area      

 

HAWAII

 

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

 

MODERATE QUAKES IN CENTRAL CHILE, KERMADEC ISLANDS AND KAMCHATKA

 

EARTHQUAKE SUMMARY FOR MAY 6, 2023

 

Tidal triggering from the Full moon and lunar eclipse appears to have been weak and short-lived this time around. Most of the significant events occurred near the time of the eclipse in the eastern hemisphere near New Zealand and Japan. Active promotion of seismicity by geomagnetic effects is possible in the next several days caused by a severe storm expected around May 8-9. This could break what is like a lull in significant seismicity over the next several days.

 

An earthquake of M 3.6 was lightly felt in the current swarm near the California- Baja California area. NEIC reported the M 3.6 was felt with intensity IV in El  Centro and II-III in Calexico, Heber, Imperial and in Baja California at Mexicali, Puebla. NEIC reported an aftershock of M 2.6 in Southern California was felt with intensity II-III in the area(s) of Southern California at Calexico and El Centro. Forecasts 152918 and 152917 had expected this activity was likely around May 5-7.

 

O: 06MAY2023 14:41:30  32.7N  115.6W Ml=2.6  EMSC   SOUTHERN CALIFORNIA

O: 06MAY2023 14:42:35  32.7N  115.5W Ml=2.3  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O:  6MAY2023 14:15:11  32.7N  115.5W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

O:  6MAY2023 14:16:02  32.7N  115.5W Ml=3.6  ANSS   SOUTHERN CALIFORNIA          

P:  5MAY2023 152918    32.5N  115.7W 2.5-4.8 AAAAA  So. California             

 

O:  6MAY2023 16:45:41  30.9N  116.2W ML=3.6  EMSC   BAJA CALIFORNIA, MEXICO      

P:  7MAY2023 152917    30.8N  116.0W 2.5-4.6 AAAAA  So. California             

 

The strongest earthquakes in the world today occurred with M 5.1-5.2 in the Kermadec Islands, Kamchatka and Central Chile. The earthquakes in Kamchatka and the Kermadec Islands occurred in remote areas and were not reported felt. Forecasts 152990 and 153063 had expected these events around May 7-8 within about 100 km of these epicenters.

 

O: 06MAY2023 16:52:09  51.7N  159.9E mb=4.0  EMSC   OFF EAST COAST OF KAMCHATKA

O: 06MAY2023 15:58:31  52.3N  159.6E mb=5.2  EMSC   OFF EAST COAST OF KAMCHATKA

O:  6MAY2023 08:55:24  51.4N  160.1E mb=4.3  EMSC   OFF EAST COAST OF KAMCHATKA  

P:  8MAY2023 152990    52.0N  160.0E 4.0-5.4 AAAAA  E. of Kamchatka            

 

O:  6MAY2023 16:59:35  30.2S  177.7W mb=5.1  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  7MAY2023 153063    31.0S  177.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

 

NEIC reported the earthquake of M 5.2 in Central Chile was felt with intensity II-III in the area(s) of Central Chile in Taltal, Antofagasta.  Forecast 153041 had expected this event within about 150 km was likely around May 6, 2023.

 

O:  7MAY2023 06:29:00  25.4S   70.4W Mw=5.2  EMSC   ANTOFAGASTA, CHILE           

P:  6MAY2023 153041    27.0S   71.0W 4.0-5.6 ABAAA  Coast Central Chile        

 

 

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of the Nias, Indonesia April 24, 2023, where promoted seismicity is considered likely.

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 06MAY2023 16:52:09  51.7N  159.9E mb=4.0  EMSC   OFF EAST COAST OF KAMCHATKA

O: 06MAY2023 15:58:31  52.3N  159.6E mb=5.2  EMSC   OFF EAST COAST OF KAMCHATKA

O:  6MAY2023 08:55:24  51.4N  160.1E mb=4.3  EMSC   OFF EAST COAST OF KAMCHATKA  

P:  8MAY2023 152990    52.0N  160.0E 4.0-5.4 AAAAA  E. of Kamchatka            

 

O:  6MAY2023 08:01:01  28.8N   86.6E mb=4.3  EMSC   WESTERN XIZANG               

P:  6MAY2023 152869    27.0N   88.0E 3.5-5.8 ABAAA  Nepal                      

 

O:  6MAY2023 23:19:46  55.8N  161.8E mb=4.2  EMSC   NEAR EAST COAST OF KAMCHATKA 

P:  3MAY2023 152990    56.0N  162.0E 4.0-5.9 BAAAA  E. of Kamchatka            

P:  5MAY2023 152990    54.0N  161.0E 4.0-5.6 ABAAA  E. of Kamchatka            

 

O:  6MAY2023 17:04:33  79.1N  125.0E mb=4.2  EMSC   EAST OF SEVERNAYA ZEMLYA     

P:  7MAY2023 153022    82.0N  119.0E 4.0-5.8 ACAAA  Arctic Ocean Region        

 

INDONESIA AND PHILIPPINES

 

 

O:  6MAY2023 19:38:55   2.4N  126.8E mb=4.8  EMSC   MOLUCCA SEA                  

P: 10MAY2023 152797     2.0N  128.0E 4.0-5.7 BABAA  Halmahera                  

 

O:  6MAY2023 09:28:26   3.8S  134.9E ML=4.0  EMSC   PAPUA, INDONESIA             

P:  5MAY2023 152826     2.0S  134.0E 4.0-5.5 ABAAA  West Irian, PNG            

P:  6MAY2023 152826     3.0S  136.0E 4.0-5.4 AAAAA  West Irian, PNG            

 

O:  7MAY2023 05:20:30   4.2N  126.7E ML=4.1  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  8MAY2023 152800     5.0N  125.0E 4.0-5.5 AABAA  Mindanao, Philippines      

P: 30APR2023 152528     4.0N  126.0E 4.0-5.6 CAAAA  Mindanao, Philippines      

 

O:  6MAY2023 23:01:01   4.4S  138.4E mb=4.3  EMSC   PAPUA, INDONESIA             

P:  6MAY2023 152826     3.0S  136.0E 4.0-5.4 ABCAA  West Irian, PNG            

 

O:  6MAY2023 14:30:18   4.6S  151.1E mb=4.5  EMSC   NEW BRITAIN REGION, P.N.G.   

P:  2MAY2023 152816     4.0S  151.0E 4.0-5.4 BAAAA  New Ireland                

 

O:  6MAY2023 19:46:24   6.2S  129.1E mb=4.4  EMSC   BANDA SEA                    

P:  5MAY2023 152828     7.0S  130.0E 4.0-5.6 AAAAA  West Irian, PNG            

 

O:  6MAY2023 18:57:00   8.1S  107.9E ML=4.4  EMSC   JAVA, INDONESIA              

P:  7MAY2023 152823     8.0S  108.0E 4.0-5.7 AAAAA  So. of Java                 

 

O:  6MAY2023 18:01:34  10.4S  113.0E ML=4.1  EMSC   SOUTH OF JAVA, INDONESIA     

P:  3MAY2023 152822     9.0S  113.0E 4.0-5.4 BAAAA  So. of Bali                

 

O:  6MAY2023 22:34:14  11.0S  122.0E mb=4.6  EMSC   SOUTH OF TIMOR                

P:  7MAY2023 152810     8.0S  123.0E 4.0-5.4 ACAAA  Flores Island area         

P:  9MAY2023 153032    10.0S  118.0E 4.0-5.4 BACAA  Sumbawa Island area        

 

O:  7MAY2023 02:39:59  13.1N  144.7E mb=4.5  EMSC   GUAM REGION                  

P:  8MAY2023 152856    13.0N  144.0E 4.0-5.4 AAAAA  So. Marianas/Guam          

O: 06MAY2023 19:38:58   2.4N  126.8E mb=4.8  EMSC   MOLUCCA SEA

 

NEIC reported this earthquake of M 4.5 in Guam was felt with intensity II-III in the area(s) of Guam in Tamuning and Dededo.

 

CENTRAL AND SOUTH AMERICA

 

O:  6MAY2023 19:45:17   8.1S   76.7W ML=4.2  EMSC   CENTRAL PERU                 

P:  3MAY2023 152806     8.0S   74.0W 3.5-5.4 BACAA  Brazil                     

 

O:  6MAY2023 11:52:37  11.2N   87.0W ML=4.1  EMSC   NEAR COAST OF NICARAGUA      

P:  5MAY2023 152848    13.0N   87.0W 3.5-5.1 ABAAA  Nicaragua                  

 

O:  7MAY2023 00:26:03  13.1N   89.7W mb=4.3  EMSC   OFFSHORE EL SALVADOR         

P:  7MAY2023 152835    14.0N   89.0W 3.5-5.1 AAAAA  Coast of Central America   

 

O: 07MAY2023 03:59:31  15.9N   95.3W ML=4.2  EMSC   OFFSHORE OAXACA, MEXICO

O:  6MAY2023 16:43:22  15.0N   96.6W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO      

P:  4MAY2023 152852    16.0N   97.0W 3.5-5.5 AAAAA  Oaxaca, Mexico              

P:  8MAY2023 152852    16.0N   96.0W 3.5-5.1 AAAAA  Oaxaca, Mexico             

 

O:  6MAY2023 09:26:16  16.0N   93.6W ML=4.0  EMSC   CHIAPAS, MEXICO              

P:  8MAY2023 152833    15.0N   94.0W 3.5-5.4 AAAAA  Chiapas, Mexico            

 

O:  7MAY2023 01:16:17  17.3N  100.9W ML=4.0  EMSC   GUERRERO, MEXICO             

P:  8MAY2023 152844    19.0N  101.0W 3.5-5.5 ABAAA  Michoacan, Mexico          

 

O:  6MAY2023 16:05:32  18.1N   68.4W Md=3.4  EMSC   DOMINICAN REPUBLIC REGION    

P:  4MAY2023 152854    18.0N   69.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O:  7MAY2023 06:53:15  19.0N   63.9W Md=3.5  EMSC   VIRGIN ISLANDS REGION        

P:  7MAY2023 152839    19.0N   64.0W 3.0-5.1 AAAAA  Leeward Islands            

 

O: 07MAY2023 00:46:27  19.1N   65.5W Md=3.4  EMSC   PUERTO RICO REGION

O:  6MAY2023 15:20:54  19.0N   65.9W Md=3.2  EMSC   PUERTO RICO REGION           

P:  8MAY2023 152854    19.0N   66.0W 3.4-5.4 AAAAA  Puerto Rico                

 

O:  6MAY2023 16:16:55  19.1N  107.5W ML=4.1  EMSC   OFF COAST OF JALISCO, MEXICO 

P:  7MAY2023 152863    20.0N  109.0W 3.5-5.1 AABAA  Gulf of California         

 

O:  7MAY2023 04:12:42  22.5S   68.7W mb=4.6  EMSC   ANTOFAGASTA, CHILE           

P:  5MAY2023 153038    21.0S   68.0W 4.0-5.6 ABAAA  Argentina                  

 

O:  7MAY2023 06:29:00  25.4S   70.4W Mw=5.2  EMSC   ANTOFAGASTA, CHILE           

P:  6MAY2023 153041    27.0S   71.0W 4.0-5.6 ABAAA  Coast Central Chile        

 

O:  6MAY2023 07:34:52  26.2N  103.3W ML=4.0  EMSC   DURANGO, MEXICO              

P:  3MAY2023 152870    28.0N   98.0W 3.0-4.6 BBCAA  Northern Mexico            

 

 

O: 07MAY2023 01:41:30  15.5S   70.8W mb=4.2  EMSC   SOUTHERN PERU

P:  4MAY2023 153031    16.0S   74.0W 4.0-5.5 BACAA  So. Peru/Bolivia           

 

AFRICA AND EUROPE

 

O:  7MAY2023 02:51:20  10.1N   41.0E mb=4.1  EMSC   ETHIOPIA                     

P: 10MAY2023 152836    13.0N   40.0E 3.5-5.0 BCAAA  Ethiopia                   

 

O:  6MAY2023 14:43:24  34.9N   23.5E mb=4.5  EMSC   CRETE, GREECE                 

P:  6MAY2023 152893    34.0N   25.0E 3.0-4.6 AABAA  Crete                      

 

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

 

O:  6MAY2023 12:29:25  37.9N   36.6E ML=4.0  EMSC   CENTRAL TURKEY               

P:  5MAY2023 152937    38.0N   36.0E 3.5-5.6 AAAAA  Turkey                     

 

NEIC reported this earthquake of M 4.2 in Turkey was felt with intensity II-III in the area(s) of Turkey in Gaziantep.

 

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

 

SOUTHWEST PACIFIC

 

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

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  6MAY2023 16:59:35  30.2S  177.7W mb=5.1  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  7MAY2023 153063    31.0S  177.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

 

O:  6MAY2023 07:00:20  32.5S  178.5W mb=4.6  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  4MAY2023 153064    32.0S  178.0W 4.0-5.5 AAAAA  So. Kermadec Islands       

 

JAPAN AND KURIL ISLANDS

 

O:  6MAY2023 21:25:17  25.5N  143.6E mb=4.5  EMSC   VOLCANO ISLANDS, JAPAN REGION

P:  6MAY2023 152861    28.0N  143.0E 4.0-5.5 ACAAA  Bonin Islands              

 

O:  6MAY2023 21:26:21  29.3N  139.4E mb=4.2  EMSC   IZU ISLANDS, JAPAN REGION    

P:  6MAY2023 152861    28.0N  139.0E 4.0-5.4 ABAAA  Bonin Islands              

 

O:  6MAY2023 14:54:30  37.6N  137.3E ML=4.1  EMSC   NEAR WEST COAST OF HONSHU, JAP

P:  7MAY2023 152906    35.0N  137.0E 3.5-4.9 ACAAA  No. Honshu, Japan          

 

O:  6MAY2023 18:48:17  50.6N  156.6E mb=4.2  EMSC   KURIL ISLANDS                

P:  5MAY2023 152992    52.0N  159.0E 4.0-5.8 ABBAA  Kamchatka                  

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 06MAY2023 08:34:03  30.6N  115.1W ML=3.1  EMSC   BAJA CALIFORNIA, MEXICO

O: 06MAY2023 16:44:19  30.8N  116.3W ML=3.4  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 06MAY2023 09:02:31  31.4N  115.3W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO

O: 06MAY2023 10:51:20  31.4N  115.2W ML=3.0  EMSC   BAJA CALIFORNIA, MEXICO

 

O: 06MAY2023 20:58:53  38.8N  122.5W Md=2.1  EMSC   NORTHERN CALIFORNIA

O:  6MAY2023 12:18:38  38.8N  122.8W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P:  5MAY2023 152888    38.9N  122.8W 2.5-4.6 AAAAA  Central California         

 

O:  6MAY2023 16:45:41  30.9N  116.2W ML=3.6  EMSC   BAJA CALIFORNIA, MEXICO      

O: 06MAY2023 14:41:30  32.7N  115.6W Ml=2.6  EMSC   SOUTHERN CALIFORNIA

O: 06MAY2023 14:42:35  32.7N  115.5W Ml=2.3  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O:  6MAY2023 14:15:11  32.7N  115.5W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P:  5MAY2023 152918    32.5N  115.7W 2.5-4.8 AAAAA  So. California             

P:  7MAY2023 152917    30.8N  116.0W 2.5-4.6 AAAAA  So. California             

 

O:  7MAY2023 05:28:44  36.3N  119.7W Md=2.2  EMSC   CENTRAL CALIFORNIA           

P:  7MAY2023 152886    36.6N  120.7W 2.5-4.5 AAAAA  Central California         

 

O:  6MAY2023 20:25:36  36.7N  121.1W Md=2.5  EMSC   CENTRAL CALIFORNIA           

P:  7MAY2023 152886    36.6N  120.7W 2.5-4.5 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.5 in Central California was felt with intensity II-III in the area(s) of Central California in Gustine.

 

 

ALASKA

 

O:  6MAY2023 07:41:07  63.2N  150.4W ML=3.5  EMSC   CENTRAL ALASKA               

P:  7MAY2023 153012    63.3N  151.0W 3.2-5.1 AAAAA  Central Alaska             

 

O:  6MAY2023 20:41:53  65.4N  144.7W ML=3.0  EMSC   NORTHERN ALASKA              

P:  5MAY2023 153011    63.3N  145.0W 3.2-5.1 ABAAA  Central Alaska             

 

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

 

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:  6MAY2023 13:35:06  31.6N  104.5W ML=2.6  EMSC   WESTERN TEXAS                 

P:  4MAY2023 152915    31.5N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O:  6MAY2023 07:52:02  34.5N   97.7W mb=2.5  EMSC   OKLAHOMA                     

P:  3MAY2023 152934    35.0N   97.0W 2.0-4.1 BAAAA  Southern Plains            

 

HAWAII

 

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

 

STRONG SEISMICITY CONTINUES IN JAPAN

 

EARTHQUAKE SUMMARY FOR MAY 5, 2023

 

The strong seismicity in the region near Honshu, Japan which began with an M 6.2 yesterday in northwestern Honshu continued today. The largest of these was an M 5.9 south of Hokkaido but an aftershock off northwestern Honshu of M 5.6-5.8 also occurred with additional damage and casualties.

 

The aftershock of M 5.6-5.8 also occurred today off the northwest coast of Honshu, Japan. This follows an M 6.2 reported in the previous issue of this summary.  Today's aftershock did some damage in the region and killed at least one person. NEIC reported it was felt with maximum intensity IV in Ishikawa and Niigata with II-III in Nagano, Kyoto, Shizuoka and Tokushima Prefectures, Japan.

 

This activity appears to be related to the full moon of May 5 and accompanying lunar eclipse as noted in this and previous issues of this summary as:

 

"A strong earthquake of M 6.2 occurred in western Japan today in the Ishikawa Prefecture. No tsunami warning was issued and none was observed. No abnormalities were reported at the Shika power plant or in the Kashiwazaki-Karina plant in Niigata Prefecture. NEIC reported maximum intensity VIII in Suzu, Ishikawa and IV in Niigata and Ishikawa with II-III shaking in Nagano, Gifu, Tokyo, Saitama, Kawagawa and Aichi Prefectures. This earthquake occurred within about an hour of local solar noon and was probably promoted by high tidal stresses with today's full moon and lunar eclipse which maximize near this hour as previous reported in this summary:

 

"The full moon will arrive on May 5, 2023 at 17:34 UT. This full moon (Flower moon) will be accompanied by a lunar eclipse visible in the areas of Indonesia where the solar eclipse of April 20, 2023 was visible. Enhanced seismicity is expected in the next week in this region, but not as strongly as with the solar eclipse. Longitudes at local solar midnight with this full moon are near 100 E while those at local solar noon are near 80 West longitude. In the west these include areas of Central America near Panama, Costa Rica and Nicaragua and Colombia as well as areas of the western coast of South America and in the east areas of Sumatra, Indonesia, Mongolia, Sichuan and Yunnan, China among others. These longitudes area likely to see enhanced tidally-related seismicity in the next week with a moderately large to large earthquake likely. Tidal promotion of seismicity is not limited to these longitudes and is most likely near local solar noon and midnight when tidal stresses are maximized." (May 2-3, 2023)

 

The last earthquake within about 150 km of this epicenter in western Honshu, Japan was an M 6.2 on November 22, 2014 with the last of larger magnitude in this region an  6.5-6.6 on July 16, 2007." (May 5, 2023)

 

 

Forecast 152906 had expected enhanced activity in northern Honshu, Japan was likely around May 7. Much of this occurred near local solar midnight and may have been promoted by high tidal stresses with today's full moon which was visible as a lunar eclipse at this time.

 

O: 05MAY2023 13:03:30  37.5N  137.2E ML=4.1  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O: 05MAY2023 13:26:30  37.5N  137.2E ML=4.2  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O: 05MAY2023 14:18:49  37.5N  137.2E mb=4.4  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O: 05MAY2023 14:26:30  37.5N  137.3E ML=4.0  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O: 05MAY2023 12:58:04  37.6N  137.3E mb=5.8  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O:  5MAY2023 08:38:00  37.4N  137.3E mb=4.6  EMSC   NEAR WEST COAST OF HONSHU, JAP

P:  7MAY2023 152906    35.0N  137.0E 3.5-4.9 ACAAA  No. Honshu, Japan          

 

 

The earthquake of M 5.9 south of Hokkaido, Japan today was reported by NEIC to have been felt with intensity III in Hokkaido at Tomakomai and Date and in Misawa, Aomori, Japan. This may be an aftershock of an M 6.0 that occurred about 100 km to the southeast of this epicenter on March 28, 2023. Forecast 152951 expected today's event within about 100 km was likely around May 8, 2023.

 

O:  5MAY2023 17:47:16  41.5N  142.0E Mw=5.9  EMSC   HOKKAIDO, JAPAN REGION       

P:  8MAY2023 152951    41.0N  143.0E 3.5-5.5 BAAAA  Hokkaido, Japan            

 

An earthquake of M 5.6-5.8 also occurred in the Bay of Plenty, North Island, New Zealand today. NEIC reported it was felt in the Bay of Plenty at Murupara with II-III shking in Whakatane, Maketu, TeKaraka, Gisborne, Hastings, Hawke's Bay and Kapitii, Wellington. GEONET noted 3007 people reported feeling this earthquake with 1616 at weak intensity and 1126 with light shaking and 243 with moderate intensity; 17 strong, 3 severe and 2 extreme shaking. This earthquake occurred within minutes of local solar midnight and may have been promoted by strong tidal stresses which maximized at this time with the lunar eclipse visible in this area. The last earthquake of M>=5.7 in North Island within about 200 km of this epicenter was an M 6.0 on April 4, 2021.  Forecast 153060 had expected today's event within about 50 km was likely around May 7, 2023.

 

O:  5MAY2023 11:37:10  37.4S  177.3E Mw=5.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 05MAY2023 11:37:12  37.2S  177.2E MS=5.7  GEONET North Island, New Zealand

P:  7MAY2023 153060    37.0S  177.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in Unimak Island area, Alaska. It was not reported felt in this remote area. The last earthquake in the Unimak Island area of Alaska with M>=4.6 occurred on January 21, 2023 with M 4.6, part of a series that stated on January 19 with an M 4.8. Forecast 153004 had expected today's event within about 100 km was likely around May 4.

 

O: 05MAY2023 13:09:10  53.4N  163.6W ML=3.8  EMSC   UNIMAK ISLAND REGION, ALASKA

O:  5MAY2023 07:34:15  53.6N  163.4W Mw=4.6  EMSC   UNIMAK ISLAND REGION, ALASKA 

P:  4MAY2023 153004    52.5N  163.7W 3.5-4.9 AAAAA  Unimak Islands, Aleutians  

 

An earthquake of M 2.5 also occurred in Ireland today, but was not reported felt. The last earthquake within about 150 km of today's epicenter in Ireland with M>=2.5 occurred more than 35 years ago. Today's event occurred within a minute of local solar midnight and was probably promoted by strong tidal stresses with today's full moon which maximize near this hour. Most activity in this general area occurs about 200 km to the east in the United Kingdom. The largest event within 250 km of today's epicenter in the past 35 years was an M 4.0 on June 6, 2012 about 250 km southwest of today's epicenter. This epicenter is at 102 degrees from the M 7.2 in Sumatra of May 24, 2023 and may have been promoted by energy from that source.

 

 

O:  6MAY2023 00:32:25  55.0N    8.0W ML=2.5  EMSC   IRELAND                      

 

NEIC reported an earthquake of M 5.0 in Chiapas, Mexico was felt with intensity II-III in the area(s) of Chiapas, Mexico in Tapachula. This may be related to the eruption of Fuego Volcano in Guatemala today which continued unabated with strong intensity throughout the day. Forecast 152837 had expected this activity within about 50 km was likely around May 6.

 

O:  6MAY2023 04:56:26  15.8N   92.4W Mw=5.0  EMSC   CHIAPAS, MEXICO              

P:  6MAY2023 152837    16.0N   92.0W 3.5-5.4 AAAAA  Guatemala                  

 

 

 

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of the Nias, Indonesia April 24, 2023, where promoted seismicity is considered likely.

 

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 05MAY2023 12:33:21  28.2N  105.0E mb=4.7  EMSC   SICHUAN-GUIZHOU BORDER RG, CHINA

O:  6MAY2023 05:02:01  29.2N  105.5E mb=4.4  EMSC   SICHUAN-CHONGQING BDR REG, CHI

P:  5MAY2023 152928    35.0N   99.0E 3.5-4.9 ACCAA  So. China                  

 

INDONESIA AND PHILIPPINES

 

O:  5MAY2023 19:44:09   0.0S  123.4E ML=4.3  EMSC   SULAWESI, INDONESIA          

P:  5MAY2023 152825     2.0S  123.0E 4.0-5.4 ABAAA  Sulawesi area              

P:  7MAY2023 152790     1.0N  122.0E 4.0-5.4 AABAA  Celebes Sea                

 

O:  6MAY2023 06:45:14   2.5S  140.5E ML=4.0  EMSC   NEAR N COAST OF PAPUA, INDONES

P: 29APR2023 152554     2.0S  139.0E 4.0-5.4 CABAA  West Irian, PNG            

 

O:  6MAY2023 04:54:45   4.2N  127.9E ML=4.4  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  4MAY2023 152798     4.0N  129.0E 4.0-5.6 AAAAA  Halmahera                  

 

O:  5MAY2023 10:17:17   5.0S  151.6E mb=4.9  EMSC   NEW BRITAIN REGION, P.N.G.   

P:  2MAY2023 152816     4.0S  151.0E 4.0-5.4 BAAAA  New Ireland                

 

O:  5MAY2023 17:29:06   5.9S  147.1E mb=4.3  EMSC   EASTERN NEW GUINEA REG., P.N.G

P:  2MAY2023 152817     6.0S  147.0E 4.0-5.4 BAAAA  New Ireland                

 

O:  5MAY2023 16:59:35   6.8N  126.8E mb=4.5  EMSC   MINDANAO, PHILIPPINES        

P:  3MAY2023 152798     6.0N  127.0E 4.0-5.4 AAAAA  Halmahera                  

 

O:  5MAY2023 07:32:55   6.8S  129.8E ML=4.5  EMSC   BANDA SEA                    

P:  5MAY2023 152828     7.0S  130.0E 4.0-5.6 AAAAA  West Irian, PNG            

 

O:  5MAY2023 11:44:06   7.2S  120.2E mb=5.0  EMSC   FLORES SEA                   

P:  5MAY2023 152825     8.0S  119.0E 4.0-5.4 AABAA  Sumbawa Island area        

 

O:  5MAY2023 13:53:50  10.4N  126.7E ML=4.3  EMSC   PHILIPPINE ISLANDS REGION    

P:  6MAY2023 152840    10.0N  127.0E 3.5-5.1 AAAAA  Luzon, Philippines         

 

 

CENTRAL AND SOUTH AMERICA

 

O:  6MAY2023 01:48:01   6.8N   73.1W ML=4.7  EMSC   NORTHERN COLOMBIA            

P:  7MAY2023 152794     7.0N   73.0W 4.0-5.8 AAAAA  Colombia                   

 

O:  6MAY2023 04:56:26  15.8N   92.4W Mw=5.0  EMSC   CHIAPAS, MEXICO              

P:  6MAY2023 152837    16.0N   92.0W 3.5-5.4 AAAAA  Guatemala                  

 

O: 06MAY2023 03:28:18  15.3N   95.7W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 05MAY2023 12:50:50  15.6N   95.0W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O:  6MAY2023 02:56:52  16.5N   95.1W ML=4.0  EMSC   OAXACA, MEXICO               

P:  7MAY2023 152834    17.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O:  5MAY2023 12:51:08  19.2N   72.8W ML=3.0  EMSC   HAITI REGION                 

P:  4MAY2023 152860    20.0N   73.0W 3.0-5.0 AAAAA  Bahamas/No. Caribbean      

 

O: 05MAY2023 22:02:50  28.0N  112.2W ML=3.6  EMSC   GULF OF CALIFORNIA

O: 05MAY2023 16:39:07  28.1N  112.3W ML=4.1  EMSC   GULF OF CALIFORNIA

O:  5MAY2023 07:41:07  28.0N  112.1W ML=4.2  EMSC   GULF OF CALIFORNIA           

P:  5MAY2023 152863    28.0N  112.0W 3.5-5.1 AAAAA  Gulf of California         

 

AFRICA AND EUROPE

 

O:  5MAY2023 14:52:29  38.0N   36.3E ML=4.7  EMSC   CENTRAL TURKEY               

P:  5MAY2023 152937    38.0N   36.0E 3.5-5.6 AAAAA  Turkey                      

 

O:  6MAY2023 00:32:25  55.0N    8.0W ML=2.5  EMSC   IRELAND                      

 

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

 

SOUTHWEST PACIFIC

 

O:  5MAY2023 16:28:59  17.6S  178.8W mb=4.5  EMSC   FIJI REGION                   

O:  6MAY2023 03:34:53  19.7S  178.0W mb=4.3  EMSC   FIJI REGION                  

P:  7MAY2023 153034    18.0S  178.0W 4.0-5.4 AAAAA  Tonga Islands              

 

O:  5MAY2023 23:28:00  19.4S  174.9W mb=4.5  EMSC   TONGA                         

P:  4MAY2023 153049    20.0S  175.0W 4.0-5.5 AAAAA  Tonga Islands              

 

O:  6MAY2023 02:53:32  25.5S  179.7E mb=4.4  EMSC   SOUTH OF FIJI ISLANDS        

P:  8MAY2023 153053    25.0S  179.0E 4.0-5.6 AAAAA  Tonga/Fiji                 

 

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

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  6MAY2023 07:00:19  32.6S  178.5W mb=4.7  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  4MAY2023 153064    32.0S  178.0W 4.0-5.5 AAAAA  So. Kermadec Islands       

 

O:  5MAY2023 11:37:10  37.4S  177.3E Mw=5.6  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 05MAY2023 11:37:12  37.2S  177.2E MS=5.7  GEONET North Island, New Zealand

P:  7MAY2023 153060    37.0S  177.0E 3.0-4.6 AAAAA  North Island, N.Z.         

 

O:  5MAY2023 18:03:16  38.3S  179.5E mb=4.7  EMSC   EAST OF NORTH ISLAND, N.Z.   

P: 29APR2023 152780    38.0S  179.0E 3.0-4.4 CAAAA  North Island, N.Z.         

 

O:  5MAY2023 18:03:16  38.3S  179.5W mb=4.7  EMSC   EAST OF NORTH ISLAND, N.Z.   

P: 27APR2023 152778    37.0S  180.0W 3.5-5.0 CBAAA  E. of North Islands N.Z.   

 

JAPAN AND KURIL ISLANDS

 

 

O:  5MAY2023 21:46:28  22.2N  146.6E mb=5.1  EMSC   VOLCANO ISLANDS, JAPAN REGION

P:  3MAY2023 152877    22.0N  144.0E 4.0-5.6 AABAA  Volcano Islands            

 

O: 05MAY2023 13:03:30  37.5N  137.2E ML=4.1  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O: 05MAY2023 13:26:30  37.5N  137.2E ML=4.2  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O: 05MAY2023 14:18:49  37.5N  137.2E mb=4.4  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O: 05MAY2023 14:26:30  37.5N  137.3E ML=4.0  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O: 05MAY2023 12:58:04  37.6N  137.3E mb=5.8  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O:  5MAY2023 08:38:00  37.4N  137.3E mb=4.6  EMSC   NEAR WEST COAST OF HONSHU, JAP

P:  7MAY2023 152906    35.0N  137.0E 3.5-4.9 ACAAA  No. Honshu, Japan          

 

O:  5MAY2023 12:24:55  39.4N  142.0E mb=4.7  EMSC   EASTERN HONSHU, JAPAN        

P:  3MAY2023 152951    40.0N  142.0E 3.5-5.4 AAAAA  Hokkaido, Japan            

 

O:  5MAY2023 17:47:16  41.5N  142.0E Mw=5.9  EMSC   HOKKAIDO, JAPAN REGION       

P:  8MAY2023 152951    41.0N  143.0E 3.5-5.5 BAAAA  Hokkaido, Japan            

 

O:  5MAY2023 16:01:49  43.0N  146.2E mb=4.5  EMSC   OFF COAST OF HOKKAIDO, JAPAN 

P:  2MAY2023 152952    43.0N  147.0E 3.5-5.5 BAAAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 05MAY2023 21:34:04  30.8N  116.3W ML=3.5  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 05MAY2023 21:41:06  30.8N  116.3W ML=3.5  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 05MAY2023 22:49:25  30.8N  116.3W ML=3.4  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O:  5MAY2023 20:16:36  30.8N  116.3W ML=3.6  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P:  7MAY2023 152917    30.8N  116.0W 2.5-4.6 AAAAA  So. California             

 

O:  5MAY2023 09:14:55  31.6N  115.6W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO      

P:  3MAY2023 152917    31.0N  116.3W 2.5-4.6 AAAAA  So. California             

 

O:  5MAY2023 15:47:48  32.6N  115.5W Ml=2.0  EMSC   MEXICALI AREA, BAJA CALIF., ME

P:  5MAY2023 152918    32.5N  115.7W 2.5-4.8 AAAAA  So. California             

 

O:  6MAY2023 02:18:54  33.2N  116.1W ML=2.7  EMSC   SOUTHERN CALIFORNIA          

P:  6MAY2023 152918    33.7N  116.1W 2.5-4.8 AAAAA  So. California             

 

NEIC reported this earthquake of M 2.7 in Southern California was felt with intensity II-III in the area(s) of Southern California in Thermal and Temecula.

 

O:  5MAY2023 13:52:37  33.9N  118.4W Ml=2.1  EMSC   SANTA MONICA BAY, CALIFORNIA 

P:  3MAY2023 152923    34.0N  118.7W 2.5-5.0 AAAAA  So. California             

 

O:  5MAY2023 11:12:15  35.1N  118.9W ML=3.2  EMSC   CENTRAL CALIFORNIA           

P:  4MAY2023 152927    35.3N  118.6W 2.5-4.8 AAAAA  So. California             

P:  8MAY2023 152926    35.0N  119.2W 2.5-4.6 BAAAA  So. California             

 

NEIC reported this earthquake of M 3.4 in Central California was felt with intensity II-III in the area(s) of Central California in Arvin, Bakersfield, Frazier Park, Tehachapi, Lebec.

 

O:  5MAY2023 21:52:17  36.0N  115.2W ml=2.2  EMSC   NEVADA                       

P: 10MAY2023 152883    37.8N  115.8W 2.5-4.8 BBAAA  California/Nevada area     

 

O:  5MAY2023 10:18:57  37.8N  121.9W Md=2.0  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 05MAY2023 08:09:13  37.8N  121.9W Md=2.0  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P:  3MAY2023 152887    37.9N  122.0W 2.5-4.5 AAAAA  Central California         

 

The first of these event in the San Francisco Bay area occurred within minutes

of local solar midnight and may have been promoted by high tidal stresses

with today's full moon which maximize near this hour.

 

O:  5MAY2023 21:11:26  38.2N  117.9W ML=2.7  EMSC   NEVADA                       

P:  5MAY2023 152882    38.2N  118.8W 2.5-4.6 AAAAA  California/Nevada area     

 

O:  5MAY2023 17:42:24  41.1N  122.2W Md=2.5  EMSC   NORTHERN CALIFORNIA          

P:  8MAY2023 152966    40.7N  122.3W 2.5-4.6 BAAAA  Northern California        

 

 

ALASKA

 

 

O:  5MAY2023 08:34:30  51.5N  175.4W ML=3.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  5MAY2023 152985    50.8N  175.8W 3.5-5.3 AAAAA  Andreanoff Isls, Aleutians 

 

O:  5MAY2023 14:57:21  52.0N  175.3E mb=4.0  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  4MAY2023 153000    52.0N  174.0E 4.0-5.6 AAAAA  Rat Islands                

 

O: 05MAY2023 13:09:10  53.4N  163.6W ML=3.8  EMSC   UNIMAK ISLAND REGION, ALASKA

O:  5MAY2023 07:34:15  53.6N  163.4W Mw=4.6  EMSC   UNIMAK ISLAND REGION, ALASKA 

P:  4MAY2023 153004    52.5N  163.7W 3.5-4.9 AAAAA  Unimak Islands, Aleutians  

 

O: 06MAY2023 06:36:36  57.4N  154.6W ML=3.2  EMSC   KODIAK ISLAND REGION, ALASKA

O:  5MAY2023 07:44:55  58.6N  154.0W mb=4.1  EMSC   ALASKA PENINSULA             

P:  5MAY2023 153008    60.3N  153.0W 3.2-5.1 ABAAA  Central Alaska             

 

O:  5MAY2023 14:33:05  61.2N  150.7W ML=3.2  EMSC   SOUTHERN ALASKA              

P:  3MAY2023 153010    61.3N  152.3W 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 Anchorage (IV), Eagle River and Girdwood.

 

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: 05MAY2023 19:14:50  31.6N  104.2W ML=2.1  EMSC   WESTERN TEXAS

O: 06MAY2023 01:48:46  31.6N  104.5W ML=3.1  EMSC   WESTERN TEXAS

O: 05MAY2023 19:08:41  31.7N  104.4W ML=2.0  EMSC   WESTERN TEXAS

O:  5MAY2023 14:05:52  31.6N  104.5W ML=2.1  EMSC   WESTERN TEXAS                

P:  4MAY2023 152915    31.5N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

O:  5MAY2023 13:36:10  44.5N  110.6W Md=2.3  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P:  6MAY2023 152981    44.6N  110.8W 2.0-4.3 AAAAA  Yellowstone/Wyoming        

 

O:  5MAY2023 15:09:30  36.9N  104.8W ML=3.5  EMSC   NEW MEXICO                   

P:  2MAY2023 152891    37.1N  104.7W 2.0-4.3 BAAAA  Colorado area              

 

NEIC reported this earthquake of M 3.5 in Trinidad, Colorado was felt with intensity II-III in the area(s) of Trinidad, Colorado.

 

EASTERN U.S./CANADA

 

O: 05MAY2023 09:43:26  34.5N   97.7W ML=2.1  EMSC   OKLAHOMA

O: 05MAY2023 16:45:38  34.5N   97.7W ML=2.1  EMSC   OKLAHOMA

O: 05MAY2023 18:38:18  34.5N   97.7W ML=2.1  EMSC   OKLAHOMA

O:  5MAY2023 07:47:17  34.5N   97.7W ML=2.7  EMSC   OKLAHOMA                     

P:  3MAY2023 152934    35.0N   97.0W 2.0-4.1 AAAAA  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 Duncan, Marlow and Norman.

 

O:  5MAY2023 16:24:09  34.5N   85.5W Md=2.4  EMSC   GEORGIA, USA                 

P:  4MAY2023 152932    34.0N   85.0W 2.0-4.1 AAAAA  Southeast U.S.             

 

O:  5MAY2023 08:15:40  48.7N   71.9W MB=2.0  ECAN of P├⌐ribonka, QC              

P:  4MAY2023 152956    47.0N   70.0W 2.0-4.6 ABBAA  Maine                      

 

O:  5MAY2023 05:31:21  49.2N   67.0W MB=1.5  ECAN of Les M├⌐chins, QC            

P:  4MAY2023 152956    49.3N   67.5W 2.0-4.2 AAAAA  Maine                      

 

O:  5MAY2023 04:24:51  46.2N   65.2W MB=2.5  ECAN of Saint-Paul, NB              

P:  2MAY2023 152949    46.0N   66.0W 2.0-4.1 BAAAA  E. of Maine                

 

O:  4MAY2023 11:16:40  49.4N   81.3W MB=2.3  ECAN of Smooth Rock Falls, ON       

P: 28APR2023 152694    49.0N   81.0W 2.0-4.0 CAAAA  Ohio/Lake Erie             

 

O:  4MAY2023 08:00:37  47.5N   70.0W MB=0.8  ECAN of La Pocati├¿re, QC           

P:  4MAY2023 152956    47.0N   70.0W 2.0-4.6 AAAAA  Maine                      

 

HAWAII

 

O:  6MAY2023 02:26:16  21.5N  157.3W ML=3.1  EMSC   OAHU REGION, HAWAII          

P: 10MAY2023 152864    20.3N  155.1W 4.0-5.8 BBBAA  Hawaii area                

 

NEIC reported this earthquake of M 3.0 in Oahu, Hawaii was felt with intensity II-III in the area(s) of Oahu, Hawaii in Honolulu, Kailua, Kaneohe, Kapolei.

 

 

 

 

 

 

STRONG QUAKE SHAKES WESTERN JAPAN; VOLCANOES ACTIVE WITH FULL MOON

 

EARTHQUAKE SUMMARY FOR MAY 4, 2023

 

A strong earthquake of M 6.2 occurred in western Japan today in the Ishikawa Prefecture. No tsunami warning was issued and none was observed. No abnormalities were reported at the Shika power plant or in the Kashiwazaki-Karina plant in Niigata Prefecture. NEIC reported maximum intensity VIII in Suzu, Ishikawa and IV in Niigata and Ishikawa with II-III shaking in Nagano, Gifu, Tokyo, Saitama, Kawagawa and Aichi Prefectures. This earthquake occurred within about an hour of local solar noon and was probably promoted by high tidal stresses with today's full moon and lunar eclipse which maximize near this hour as previous reported in this summary:

 

"The full moon will arrive on May 5, 2023 at 17:34 UT. This full moon (Flower moon) will be accompanied by a lunar eclipse visible in the areas of Indonesia where the solar eclipse of April 20, 2023 was visible. Enhanced seismicity is expected in the next week in this region, but not as strongly as with the solar eclipse. Longitudes at local solar midnight with this full moon are near 100 E while those at local solar noon are near 80 West longitude. In the west these include areas of Central America near Panama, Costa Rica and Nicaragua and Colombia as well as areas of the western coast of South America and in the east areas of Sumatra, Indonesia, Mongolia, Sichuan and Yunnan, China among others. These longitudes area likely to see enhanced tidally-related seismicity in the next week with a moderately large to large earthquake likely. Tidal promotion of seismicity is not limited to these longitudes and is most likely near local solar noon and midnight when tidal stresses are maximized." (May 2-3, 2023)

 

The last earthquake within about 150 km of this epicenter in western Honshu, Japan was an M 6.2 on November 22, 2014 with the last of larger magnitude in this region an  6.5-6.6 on July 16, 2007. At the time of the November, 2014 this summary noted the coincidence with the new moon alignment as:

 

 

"The new moon arrived at 12:32 UT today and strong earthquakes hit within hours of the alignment in Japan (M 6.6-6.9); China (M 4.9-6.3), Afghanistan (M 5.5) and Romania (M 5.5). The timing and locations of these events suggests triggering effects from the current geomagnetic storm combined with tidal stresses from the new moon alignment were instrumental in promoting these events at this time. The earthquakes in Japan and Romania are the strongest in those regions since a similar pair hit on October 23 and October 27, 2004 in these two areas. ...

 

 

A strong earthquake of M 6.2 (NEIC) -6.8 (JMA) hit the Nagano Prefecture of eastern Honshu, Japan today. It was followed a series of felt aftershocks which were felt with intensity III in Nagano and II in Niigata, and I in Ishikawa Prefectures, Japan. … At least 37 homes collapsed and at least 39 people were injured in this mountainous area of central Japan that hosted the Winter Olympics in 1998. Most of the injured had broken bones. Aerial photographs showed extensive damage throughout the region but nuclear plants, still offline were not severely affected. Buildings destroyed in Itari included homes and businesses. At least 30 houses were destroyed in Habuka and 17 were injured there.  Many people were trapped under collapsed structures but most were rescued uninjured.

 

The foreshock of M 4.3 occurred near local solar noon when tidal stresses in  the region from the new moon alignment were maximized suggesting a tidal trigger to today's activity." (November 22, 2014)

 

Forecast 152906 had expected today's activity was likely to the south of today's epicenter was likely around May 7, 2023. 

 

O: 05MAY2023 05:47:30  37.5N  137.3E ML=4.0  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O: 05MAY2023 05:53:30  37.5N  137.2E ML=4.7  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O:  5MAY2023 05:42:04  37.6N  137.3E Mw=6.2  EMSC   NEAR WEST COAST OF HONSHU, JAP

P:  7MAY2023 152906    35.0N  137.0E 3.5-4.9 ACAAA  No. Honshu, Japan          

 

A volcano in Guatemala began a major eruption today. Tierra del Fuego about 30 miles from Guatemala City is eruption sending gas, rocks and lahar down its slopes. Fuego is near the longitude of maximum tidal stress with today's full moon and eclipse and may have been promoted to eruption by strong tidal stresses (see above). This eruption was accompanied by a series of minor earthquakes of which the largest was an M 4.0. Forecast 152837 had expected this activity was likely within about 50 km around May 6.

 

O:  4MAY2023 09:19:06  15.4N   92.0W ML=4.0  EMSC   GUATEMALA                    

P:  6MAY2023 152837    16.0N   92.0W 3.5-5.4 AAAAA  Guatemala                  

 

A second volcano south of Guatemala in Colombia - Nevado del Ruiz - is also  showing signs of imminent eruption. This volcano erupted in 1985 triggering massive mudslides - one of which destroyed Armero, Colombia leaving more than 25,000 buried under the debris. Volcanic eruptions often occur with the full and new moon due to enhanced tidal stresses at that time. Current activity near this volcano today included an M 4.2. This earthquake had been expected in forecast 152809 to the south of this epicenter.

 

O:  5MAY2023 06:06:00   0.8N   77.9W ML=4.2  EMSC   COLOMBIA-ECUADOR BORDER REGION

P:  9MAY2023 152809     2.0S   78.0W 4.0-5.7 BCAAA  Ecuador                    

 

A pair of moderate earthquakes also occurred in the region of Iceland today with M 4.4 and 4.5. These suggest this area is also becoming volcanically active with today's full moon. This activity east of Iceland is the strongest within about 150 km of these epicenters since an M 5.1 on November 11, 2021. At that time this summary noted in this regard:

 

"The strongest earthquake felt in the world today was an M 5.1 in southwestern Iceland. NEIC reported maximum intensity IV in Iceland at Vestmannaeyhar and Kopavogur with III in Hvolsvollur, Hella, Selfoss, Sudurland, Reykjavik and Grundarfjorfur. This event at a high latitude may have been promoted by the recent strong geomagnetic storm, one of the strongest in the past 15 years. It occurred where an ongoing volcanic eruption has been occurring for months and may change the nature of that eruption near Reykjavik. This is the strongest earthquake since an M 5.3 on March 14, 2021 ..." (November 11, 2021)

 

Forecast 153013 had expected today's activity in this region of Iceland was likely around May 6. This epicenter is at 144 degrees from the M 7.2 in the Kermadec Islands of April 24, 2023 and at the third node (120 degrees) from the M 7.0 in New Guinea of April 2 and the M 7.6 in the Molucca Sea of January 9, 2023 and at 103 degrees from the M 7.3 in Sumatra of April 24 and may have been promoted by energy from those sources.

 

 

O: 04MAY2023 09:52:50  63.7N   19.1W mb=4.5  EMSC   ICELAND

O:  4MAY2023 09:46:19  63.7N   19.2W mb=4.4  EMSC   ICELAND                      

P:  6MAY2023 153013    66.0N   18.0W 3.0-4.6 ACAAA  Iceland area               

 

Another area of volcanic activity that was active today was Hawaii. The largest felt earthquake in the U.S. or Canada today was an M 3.8 in Hawaii. Today's M 3.8 occurred within about half an hour of local solar noon and was probably promoted by strong tidal stresses with today's full moon which maximize near this hour. The last earthquake in Hawaii of larger magnitude was an M 4.2 and M 4.5 on April 27, 2023 about 50 km northwest of today's epicenter. An M 4.1 also hit Hawaii with the last full moon on April 4, 2023.  Forecast 152864 had expected this event within about 10 km around May 6, 2023.

 

NEIC reported this earthquake of M 3.7-3.8 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Pahoa, Mountain View, Volcano, Kurtistown, Keaau, Hilo, Papaikou, Pepeekeo and Honomu (IV), among others. This epicenter, like that in Iceland is at 103 degrees from the last major earthquake in the world 0 the M 7.3 in Sumatra of April 24 and may have been promoted by energy from that source.

 

O:  4MAY2023 23:05:56  19.4N  155.1W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII     

P:  6MAY2023 152864    19.4N  155.1W 4.0-5.8 AAAAA  Hawaii area                

 

 

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of the Nias, Indonesia April 24, 2023, where promoted seismicity is considered likely.

 

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O:  4MAY2023 15:38:20  23.4N  121.4E Mw=4.6  EMSC   TAIWAN                       

O:  4MAY2023 08:55:21  23.8N  121.7E ML=4.0  TAI    Hualien, Taiwan              

O:  4MAY2023 15:38:21  23.4N  121.3E ML=5.1  TAI    Hualien, Taiwan              

P:  3MAY2023 152875    23.0N  122.0E 4.0-5.4 AAAAA  Taiwan                     

P:  4MAY2023 152876    24.0N  123.0E 4.0-5.4 AAAAA  Taiwan                     

 

CWB reported this earthquake of M 4.0 was felt with intensity II in Hualien and I in Nantou Counties, Taiwan.

The M 5.1 was felt with intensity IV in Hualien, III in Taitung, Nantou, Kaohsiung; II in Chiayi, Yunlin, Raichung, Tainan and I in Chiayi, Changhua, Yilan, Miaoli, Pingtung and Hsinchu Counties, Taiwan.

This earthquake occurred within minutes of local solar midnight and may have

been promoted by high tidal stresses which maximize near this hour.

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

 

O:  4MAY2023 23:57:08  23.6N   90.3E mb=4.3  EMSC   BANGLADESH                   

P:  3MAY2023 152867    23.0N   94.0E 4.0-5.4 AACAA  Myanmar                    

 

NEIC reported this earthquake of M 4.3 in Bangladesh was felt with intensity III-IV in the area(s) of Bangladesh in Munshiganj, Dacca, Marayanganj, Dhamrai, Tungi, Faridpur, Gajipur, Narsingdi, Roypura and Bhaluka among others.

 

O:  5MAY2023 00:35:28  35.9N   80.2E mb=4.4  EMSC   XINJIANG-XIZANG BORDER REGION

P:  8MAY2023 152910    35.0N   78.0E 3.8-5.2 BABAA  Northern India             

 

O:  4MAY2023 12:59:33  55.6N  162.6E mb=4.3  EMSC   NEAR EAST COAST OF KAMCHATKA 

P:  3MAY2023 152990    56.0N  162.0E 4.0-5.9 AAAAA  E. of Kamchatka            

 

INDONESIA AND PHILIPPINES

 

O:  4MAY2023 21:43:10   0.8S  123.3E ML=4.4  EMSC   SULAWESI, INDONESIA          

P:  5MAY2023 152825     2.0S  123.0E 4.0-5.4 ABAAA  Sulawesi area              

 

O:  5MAY2023 04:38:42   1.1S  136.8E ML=4.2  EMSC   BIAK REGION, INDONESIA       

P:  6MAY2023 152826     3.0S  136.0E 4.0-5.4 ABAAA  West Irian, PNG            

 

O:  4MAY2023 13:19:17   3.3S  148.4E mb=4.8  EMSC   BISMARCK SEA                 

P:  6MAY2023 152816     6.0S  149.0E 4.0-5.4 ACAAA  New Ireland                

 

O:  5MAY2023 03:10:07   5.0N  124.4E ML=4.2  EMSC   CELEBES SEA                  

P:  4MAY2023 152800     5.0N  124.0E 4.0-5.8 AAAAA  Mindanao, Philippines      

 

O:  5MAY2023 00:13:48   5.2S  142.9E mb=4.3  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P:  4MAY2023 152821     4.0S  143.0E 4.0-5.4 ABAAA  Papua New Guinea           

 

O:  4MAY2023 10:06:02  10.5N  125.2E mb=4.8  EMSC   LEYTE, PHILIPPINES           

P:  2MAY2023 152840    10.0N  126.0E 3.5-5.3 AAAAA  Luzon, Philippines         

 

NEIC reported this earthquake of M 4.8 in Leyte, Philippines was felt with intensity II-III in the area(s) of Leyte, Philippines in Hinundayan and Concepcion, Eastern Visayas.

 

O:  5MAY2023 03:07:54  13.2N  143.8E mb=4.6  EMSC   GUAM REGION                   

P:  8MAY2023 152856    13.0N  144.0E 4.0-5.4 BAAAA  So. Marianas/Guam          

 

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

 

CENTRAL AND SOUTH AMERICA

 

O:  5MAY2023 01:06:05   8.6S   74.8W ML=4.0  EMSC   CENTRAL PERU                 

P:  3MAY2023 152806     8.0S   74.0W 3.5-5.4 AAAAA  Brazil                     

 

O:  5MAY2023 01:08:06  11.5N   85.7W mb=4.2  EMSC   NICARAGUA                    

P:  2MAY2023 152847    10.0N   86.0W 3.5-5.6 BBAAA  Nicaragua                  

 

O:  5MAY2023 06:06:00   0.8N   77.9W ML=4.2  EMSC   COLOMBIA-ECUADOR BORDER REGION

P:  9MAY2023 152809     2.0S   78.0W 4.0-5.7 BCAAA  Ecuador                    

 

O: 05MAY2023 01:36:38  14.5N   93.6W mb=4.5  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 04MAY2023 10:42:31  14.9N   94.4W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO

O:  5MAY2023 02:19:52  14.3N   93.6W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P:  3MAY2023 152833    14.0N   94.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O:  4MAY2023 09:19:06  15.4N   92.0W ML=4.0  EMSC   GUATEMALA                    

P:  6MAY2023 152837    16.0N   92.0W 3.5-5.4 AAAAA  Guatemala                  

 

O:  4MAY2023 17:39:23  16.2N   94.3W ML=4.2  EMSC   OFFSHORE OAXACA, MEXICO      

P:  7MAY2023 152834    17.0N   95.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

 

O:  4MAY2023 08:32:19  18.6N   68.8W Md=4.1  EMSC   DOMINICAN REPUBLIC           

P:  4MAY2023 152854    18.0N   69.0W 3.4-5.3 AAAAA  Puerto Rico                 

 

O:  5MAY2023 00:43:09  18.8N   66.8W Md=3.1  EMSC   PUERTO RICO REGION           

P:  6MAY2023 152854    18.0N   66.0W 3.4-5.2 AAAAA  Puerto Rico                

 

O:  4MAY2023 09:23:40  19.0N   68.4W ML=3.0  EMSC   DOMINICAN REPUBLIC REGION    

P:  4MAY2023 152854    18.0N   69.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O:  5MAY2023 04:00:13  19.8S   69.0W mb=4.5  EMSC   TARAPACA, CHILE              

P:  6MAY2023 153042    20.0S   70.0W 4.0-6.0 AAAAA  So. Peru/Bolivia           

 

 

AFRICA AND EUROPE

 

O:  4MAY2023 15:16:56  51.6N   16.1E ML=3.5  EMSC   POLAND                       

P:  5MAY2023 152997    51.0N   16.0E 3.0-4.8 AAAAA  Poland                     

 

O: 04MAY2023 09:52:50  63.7N   19.1W mb=4.5  EMSC   ICELAND

O:  4MAY2023 09:46:19  63.7N   19.2W mb=4.4  EMSC   ICELAND                      

P:  6MAY2023 153013    66.0N   18.0W 3.0-4.6 ACAAA  Iceland area               

 

O:  4MAY2023 08:08:37  63.8N   22.8W ML=2.9  EMSC   ICELAND REGION               

P:  3MAY2023 153013    63.0N   24.0W 3.0-4.6 AAAAA  Iceland area               

 

SOUTHWEST PACIFIC

 

O:  4MAY2023 22:20:35   8.3S  160.3E mb=5.1  EMSC   SOLOMON ISLANDS              

P:  9MAY2023 153027    10.0S  160.0E 4.0-5.4 BBAAA  No. of Santa Cruz Islands  

 

O:  4MAY2023 18:30:18  17.5S  175.1W mb=4.6  EMSC   TONGA                        

P:  7MAY2023 153034    18.0S  178.0W 4.0-5.4 BACAA  Tonga Islands              

P:  9MAY2023 153034    17.0S  172.0W 4.0-5.6 BACAA  Tonga Islands              

 

O:  4MAY2023 20:37:15  22.2S  174.8W mb=4.9  EMSC   TONGA REGION                 

P:  7MAY2023 153051    24.0S  176.0W 4.0-5.4 BBAAA  Tonga Islands              

 

O:  5MAY2023 03:20:55  24.2S  179.8E mb=4.4  EMSC   SOUTH OF FIJI ISLANDS        

P:  1MAY2023 153052    25.0S  180.0E 4.0-5.4 BAAAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 04MAY2023 09:52:50  63.7N   19.1W mb=4.5  EMSC   ICELAND

O:  4MAY2023 09:46:19  63.7N   19.2W mb=4.4  EMSC   ICELAND                      

P:  6MAY2023 153013    66.0N   18.0W 3.0-4.6 ACAAA  Iceland area               

 

O:  4MAY2023 08:08:37  63.8N   22.8W ML=2.9  EMSC   ICELAND REGION               

P:  3MAY2023 153013    63.0N   24.0W 3.0-4.6 AAAAA  Iceland area               

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  4MAY2023 08:40:30  29.7S  177.0W mb=4.8  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  2MAY2023 153059    30.0S  177.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

P:  6MAY2023 153044    29.0S  178.0W 4.0-5.5 AAAAA  No. Kermadec Islands       

 

JAPAN AND KURIL ISLANDS

 

O: 05MAY2023 05:47:30  37.5N  137.3E ML=4.0  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O: 05MAY2023 05:53:30  37.5N  137.2E ML=4.7  EMSC   NEAR WEST COAST OF HONSHU, JAPAN

O:  5MAY2023 05:42:04  37.6N  137.3E Mw=6.2  EMSC   NEAR WEST COAST OF HONSHU, JAP

P:  7MAY2023 152906    35.0N  137.0E 3.5-4.9 ACAAA  No. Honshu, Japan          

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 04MAY2023 21:38:57  31.3N  115.2W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO

O:  4MAY2023 20:13:09  31.1N  115.4W ML=3.1  EMSC   BAJA CALIFORNIA, MEXICO      

P:  3MAY2023 152917    31.0N  116.3W 2.5-4.6 AAAAA  So. California             

 

O:  4MAY2023 17:35:49  32.7N  115.5W Ml=2.0  EMSC   MEXICALI-CALEXICO AREA, CALIF.

P:  2MAY2023 152918    32.7N  115.4W 2.5-4.7 AAAAA  So. California             

 

O:  4MAY2023 18:21:33  34.9N  116.4W Ml=2.4  EMSC   SOUTHERN CALIFORNIA          

P:  4MAY2023 152925    35.1N  117.0W 2.5-4.9 AAAAA  So. California             

P:  9MAY2023 152924    34.6N  116.7W 2.5-4.8 BAAAA  So. California             

 

O:  4MAY2023 13:05:01  36.1N  117.8W Ml=2.0  EMSC   CENTRAL CALIFORNIA           

P:  4MAY2023 152925    35.4N  117.7W 2.5-4.6 AAAAA  So. California             

 

O:  4MAY2023 19:45:32  36.3N  120.9W Md=2.0  EMSC   CENTRAL CALIFORNIA           

P:  2MAY2023 152913    35.8N  121.3W 2.5-4.4 AAAAA  Off So. California         

P:  7MAY2023 152886    36.6N  120.7W 2.5-4.5 BAAAA  Central California         

 

O:  4MAY2023 07:57:49  37.5N  117.9W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P:  2MAY2023 152880    37.1N  117.8W 2.5-4.6 AAAAA  California/Nevada area     

 

O:  4MAY2023 08:40:04  39.6N  122.0W Md=2.3  EMSC   NORTHERN CALIFORNIA          

P:  3MAY2023 152889    39.6N  123.4W 2.5-4.9 AABAA  Central California         

 

O:  4MAY2023 11:35:22  39.9N  123.6W Md=2.1  EMSC   NORTHERN CALIFORNIA          

O: 04MAY2023 17:29:24  39.9N  123.6W Md=2.1  EMSC   NORTHERN CALIFORNIA

P:  3MAY2023 152889    39.6N  123.4W 2.5-4.9 AAAAA  Central California         

P:  6MAY2023 152966    40.0N  123.0W 2.5-4.8 AAAAA  Northern California        

 

 

ALASKA

 

O:  4MAY2023 09:40:03  51.2N  179.2W ml=3.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  7MAY2023 152984    50.8N  179.5W 3.5-4.9 BAAAA  Andreanoff Isls, Aleutians 

 

O:  4MAY2023 19:09:56  51.4N  177.2W ml=3.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  5MAY2023 152985    50.8N  175.8W 3.5-5.3 AAAAA  Andreanoff Isls, Aleutians 

 

O:  4MAY2023 08:02:11  54.1N  162.8W mb=4.0  EMSC   ALASKA PENINSULA             

P:  2MAY2023 153004    54.5N  161.8W 3.5-5.3 AAAAA  Unimak Islands, Aleutians  

 

NEIC reported an earthquake of M 3.0 in Southern Alaska  was felt with intensity II-III in the area(s) of  Southern Alaska in Wasilla, Talkeetna, Willow, Palmer.

 

O:  4MAY2023 19:17:16  67.6N  166.6W ml=3.7  EMSC   BERING STRAIT                

 

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: 04MAY2023 07:56:11  32.2N  103.1W ML=2.6  EMSC   NEW MEXICO

O:  4MAY2023 19:07:03  31.6N  104.2W ML=2.0  EMSC   WESTERN TEXAS                

P:  4MAY2023 152915    31.5N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

O:  5MAY2023 03:18:13  32.0N  102.1W mb=2.5  EMSC   WESTERN TEXAS                

P:  6MAY2023 152915    32.5N  101.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

NEIC reported this earthquake of M 2.5 in Western Texas was felt with intensity II-III in the area(s) of Western Texas in Odessa.

 

EASTERN U.S./CANADA

 

O:  4MAY2023 08:00:37  47.5N   70.0W MB=0.8  ECAN of La Pocati├¿re, QC           

P:  4MAY2023 152956    47.0N   70.0W 2.0-4.6 AAAAA  Maine                      

 

O: 05MAY2023 01:24:18  29.1N   97.8W mb=2.5  EMSC   SOUTHERN TEXAS

O: 05MAY2023 02:13:17  29.2N   97.8W mb=2.5  EMSC   SOUTHERN TEXAS

O:  4MAY2023 13:50:14  29.1N   97.7W ML=2.5  EMSC   SOUTHERN TEXAS               

P:  3MAY2023 152870    28.0N   98.0W 3.0-4.6 ABAAA  Northern Mexico            

 

O: 04MAY2023 09:17:41  34.5N   97.2W ML=2.1  EMSC   OKLAHOMA

O:  5MAY2023 06:36:23  34.5N   97.7W ML=2.4  EMSC   OKLAHOMA                     

P:  3MAY2023 152934    35.0N   97.0W 2.0-4.1 AAAAA  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 Minco (V), Anadarko (IV), Pocasset, Binger and Ponca City.

 

HAWAII

 

O:  4MAY2023 23:05:56  19.4N  155.1W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII     

P:  6MAY2023 152864    19.4N  155.1W 4.0-5.8 AAAAA  Hawaii area                 

 

QUIET SEISMICITY MAY BE INTERRUPTED WITH LUNAR ECLIPSE

 

EARTHQUAKE SUMMARY FOR MAY 3, 2023

 

Global seismicity was again at relatively quiet levels today. Earthquakes of M>=5 occurred today in the Kermadec Islands, New Zealand (M 5.0); the Southern East Pacific Rise (M 5.3); Afghanistan (M 5.3); Sichuan, China (M 5.0); and northern Luzon, Philippines (M 5.4).

 

The earthquake in Luzon, Philippines follows a similar event yesterday in that region.  NEIC reported this earthquake of M 5.4 in Luzon, Philippines was felt with intensity II-III in the area(s) of Luzon, Philippines in Tuguegarao, Cagayan Valley (IV) and Baguio, Cordillera.  Forecast 152841 had expected enhanced activity in Luzon was likely around May 2, 2023.

 

NEIC reported this earthquake of M 5.4 in Luzon, Philippines was felt with intensity II-III in the area(s) of Luzon, Philippines in Tuguegarao, Cagayan Valley (IV) and Baguio, Cordillera.

 

O: 04MAY2023 01:22:04  17.6N  122.4E mb=4.9  EMSC   LUZON, PHILIPPINES

O: 04MAY2023 05:56:15  17.6N  122.2E mb=4.8  EMSC   LUZON, PHILIPPINES

O:  4MAY2023 00:49:05  17.5N  122.4E Mw=5.4  EMSC   LUZON, PHILIPPINES           

P:  2MAY2023 152841    13.0N  122.0E 3.5-4.9 ACAAA  Luzon, Philippines         

 

The earthquake of M 5.3 in the Southern East Pacific Rise was not reported felt in this remote area. It is the strongest event within about 250 km of this epicenter since an M 5.9 on September 7, 2022 and prior to that an M 5.4 on

June 30, 2018.

 

O:  3MAY2023 23:25:50  53.1S  118.2W mb=5.3  EMSC   SOUTHERN EAST PACIFIC RISE   

 

The earthquake in Sichuan follows similar activity yesterday which had been discussed in this summary as:

 

"A pair of moderate earthquake of M 4.6 and 4.9 occurred later in the day in China near the Sichuan-Guizhou border region. Forecast 152593 had expected this activity in late April." (May 3, 2023)

 

NEIC reported today's earthquake of M 5.0 in Sichuan-Guizhou, China was felt with intensity II-III in the area(s) of Sichuan-Guizhou, China in Luzhou.

 

O:  4MAY2023 02:15:32  28.2N  105.3E mb=5.0  EMSC   SICHUAN-GUIZHOU BORDER RG, CHI

P:  6MAY2023 152868    27.0N   97.0E 4.0-5.4 ABCAA  Myanmar                    

 

The M 5.3 in Afghanistan had been expected in forecast 152895 within  about 100 km around May 6, 2023. NEIC reported this earthquake of M 5.3 in Hindu Kush, Afghanistan was felt with intensity II-III in the area(s) of Hindu Kush, Afghanistan in Kabul and in Tashkent, Uzbekistan.

 

O:  3MAY2023 09:51:19  36.6N   70.7E Mw=5.3  EMSC   HINDU KUSH REGION, AFGHANISTAN

P:  6MAY2023 152895    36.0N   70.0E 3.8-5.5 BAAAA  Hindu Kush/Pakistan        

 

This quiet period follows an active period of enhanced seismicity with the Solar Eclipse of April 20. Enhancement by tidal effects with that eclipse probably helped to alleviate seismic stresses leading to the current period of inactive seismicity. This may change in the next several days as the lunar eclipse of May 5, 2023 approaches. Large earthquakes tend to over-reach the available seismic stress as inertia of the earth pushes faults more than the release of seismic strain would normally do. This means that areas which were active in the last active period are due for corrective seismicity. Most of this occurred in the area of Indonesia during late April, so it is not unreasonable to see enhanced seismicity in that area with this full moon, but at considerably less amplitude than with the solar eclipse. This summary had noted the tidal seismicity expected with the current full moon in this and previous issues of this summary as:

 

 

"The full moon will arrive on May 5, 2023 at 17:34 UT. This full moon (Flower moon) will be accompanied by a lunar eclipse visible in the areas of Indonesia where the solar eclipse of April 20, 2023 was visible. Enhanced seismicity is expected in the next week in this region, but not as strongly as with the solar eclipse. Longitudes at local solar midnight with this full moon are near 100 E while those at local solar noon are near 80 West longitude. In the west these include areas of Central America near Panama, Costa Rica and Nicaragua and Colombia as well as areas of the western coast of South America and in the east areas of Sumatra, Indonesia, Mongolia, Sichuan and Yunnan, China among others. These longitudes area likely to see enhanced tidally-related seismicity in the next week with a moderately large to large earthquake likely. Tidal promotion of seismicity is not limited to these longitudes and is most likely near local solar noon and midnight when tidal stresses are maximized." (May 2-3, 2023)

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in the Unimak Island region of Alaska. The last earthquakes in the Unimak Island region with equal or greater magnitude occurred as an M 4.4 on March 6, 2023 and January 21, 2023 with M 4.6. Forecast 153004 had expected today's event in the Unimak area within about 100 km of today's epicenter was likely around May 4.

 

O:  3MAY2023 16:52:38  53.4N  164.4W mb=4.0  EMSC   UNIMAK ISLAND REGION, ALASKA 

P:  4MAY2023 153004    52.5N  163.7W 3.5-4.9 AAAAA  Unimak Islands, Aleutians  

 

 

 

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of the Nias, Indonesia April 24, 2023, where promoted seismicity is considered likely.

 

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O:  3MAY2023 23:48:54  27.3N   97.0E mb=4.6  EMSC   MYANMAR-INDIA BORDER REGION  

P:  6MAY2023 152868    27.0N   97.0E 4.0-5.4 AAAAA  Myanmar                    

 

O:  4MAY2023 02:15:32  28.2N  105.3E mb=5.0  EMSC   SICHUAN-GUIZHOU BORDER RG, CHI

P:  6MAY2023 152868    27.0N   97.0E 4.0-5.4 ABCAA  Myanmar                    

 

O:  3MAY2023 23:51:07  34.5N   87.9E ML=4.0  EMSC   WESTERN XIZANG               

P:  2MAY2023 152943    30.0N   88.0E 3.8-5.4 ACAAA  Xizang                     

 

O:  3MAY2023 09:51:19  36.6N   70.7E Mw=5.3  EMSC   HINDU KUSH REGION, AFGHANISTAN

P:  6MAY2023 152895    36.0N   70.0E 3.8-5.5 BAAAA  Hindu Kush/Pakistan        

 

O: 03MAY2023 10:33:45  38.3N   73.0E mb=4.0  EMSC   TAJIKISTAN

P:  8MAY2023 152896    38.0N   73.0E 3.8-5.6 BAAAA  Hindu Kush/Pakistan        

 

O:  4MAY2023 04:26:09  51.4N   96.0E mb=4.1  EMSC   SOUTHWESTERN SIBERIA, RUSSIA 

P:  5MAY2023 153002    51.0N   98.0E 3.0-4.4 AABAA  So. Siberia                

 

O:  3MAY2023 19:06:15  52.3N  159.6E mb=4.8  EMSC   OFF EAST COAST OF KAMCHATKA  

P:  5MAY2023 152992    52.0N  159.0E 4.0-5.8 AAAAA  Kamchatka                  

 

 

INDONESIA AND PHILIPPINES

 

 

O:  3MAY2023 10:12:14  10.2S  119.2E ML=4.3  EMSC   SUMBA REGION, INDONESIA      

P:  1MAY2023 153032    11.0S  119.0E 4.0-5.8 AAAAA  So. of Indonesia           

 

O: 04MAY2023 01:22:04  17.6N  122.4E mb=4.9  EMSC   LUZON, PHILIPPINES

O: 04MAY2023 05:56:15  17.6N  122.2E mb=4.8  EMSC   LUZON, PHILIPPINES

O:  4MAY2023 00:49:05  17.5N  122.4E Mw=5.4  EMSC   LUZON, PHILIPPINES           

P:  2MAY2023 152841    13.0N  122.0E 3.5-4.9 ACAAA  Luzon, Philippines         

 

CENTRAL AND SOUTH AMERICA

 

NEIC reported an earthquake of M 4.2 in the Virgin Islands was felt with intensity II-III in the area(s) of the Virgin Islandsn Saint Thomas and Saint John and in Puerto Rico in Gurabo, Guaynabo and Toa Alta.

 

O:  4MAY2023 00:30:17   7.8S   75.9W ML=4.2  EMSC   NORTHERN PERU                

P:  3MAY2023 152806     8.0S   74.0W 3.5-5.4 AABAA  Brazil                     

 

O: 03MAY2023 21:05:12  13.1N   89.0W ML=4.2  EMSC   OFFSHORE EL SALVADOR

O:  3MAY2023 10:03:19  12.4N   88.3W mb=4.5  EMSC   OFFSHORE EL SALVADOR         

P:  3MAY2023 152835    13.0N   89.0W 3.5-5.2 AAAAA  Coast of Central America   

 

O: 03MAY2023 15:34:40  14.2N   93.1W ML=4.1  EMSC   OFFSHORE CHIAPAS, MEXICO

O:  3MAY2023 14:34:12  14.9N   93.1W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO     

P:  3MAY2023 152833    14.0N   94.0W 3.5-5.3 AAAAA  Chiapas, Mexico             

 

O:  3MAY2023 15:04:55  15.1N   94.2W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P:  2MAY2023 152834    15.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O:  4MAY2023 03:39:31  16.9N   95.0W ML=4.2  EMSC   OAXACA, MEXICO                

P:  7MAY2023 152834    17.0N   95.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

 

O:  3MAY2023 13:42:23  17.7N  102.1W ML=4.0  EMSC   OFFSHORE GUERRERO, MEXICO    

P:  2MAY2023 152843    17.0N  101.0W 3.5-5.6 AAAAA  Michoacan, Mexico          

 

O:  3MAY2023 21:02:07  17.9N   66.8W Md=3.0  EMSC   PUERTO RICO REGION           

O: 03MAY2023 18:16:58  17.9N   66.8W Md=3.1  EMSC   PUERTO RICO REGION

P:  2MAY2023 152854    19.0N   67.0W 3.4-5.5 ABAAA  Puerto Rico                

P:  6MAY2023 152854    18.0N   66.0W 3.4-5.2 BAAAA  Puerto Rico                

 

O:  3MAY2023 23:37:55  18.1N  103.2W ML=4.0  EMSC   OFFSHORE MICHOACAN, MEXICO   

P:  1MAY2023 152845    18.0N  103.0W 3.5-5.4 AAAAA  Michoacan, Mexico          

 

O:  3MAY2023 20:02:16  18.3N   68.7W Md=4.3  EMSC   DOMINICAN REPUBLIC           

P:  4MAY2023 152854    18.0N   69.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O:  4MAY2023 05:44:18  18.3N   73.8W ML=3.1  EMSC   HAITI REGION                 

P:  4MAY2023 152860    20.0N   73.0W 3.0-5.0 ABAAA  Bahamas/No. Caribbean      

 

O:  3MAY2023 07:43:12  18.6N  103.9W ML=4.0  EMSC   OFFSHORE COLIMA, MEXICO      

P:  1MAY2023 152845    18.0N  103.0W 3.5-5.4 AAAAA  Michoacan, Mexico          

 

O: 03MAY2023 20:42:05  19.4N   64.8W Md=3.4  EMSC   VIRGIN ISLANDS REGION

O:  4MAY2023 03:52:41  19.0N   65.0W mb=4.1  EMSC   VIRGIN ISLANDS REGION        

P:  2MAY2023 152859    20.0N   65.0W 3.0-4.7 AAAAA  Bahamas/No. Caribbean      

P:  4MAY2023 152839    18.0N   65.0W 3.0-5.1 AAAAA  Leeward Islands             

 

O:  4MAY2023 03:17:37  19.4N  103.9W ML=4.0  EMSC   COLIMA, MEXICO               

P:  4MAY2023 152845    19.0N  105.0W 3.5-5.3 AAAAA  Michoacan, Mexico          

 

O: 03MAY2023 09:35:36  27.4N  111.5W ML=3.5  EMSC   GULF OF CALIFORNIA

O: 03MAY2023 12:39:28  28.1N  111.6W ML=4.3  EMSC   GULF OF CALIFORNIA

O:  3MAY2023 08:03:45  27.4N  111.6W Mw=4.4  EMSC   GULF OF CALIFORNIA           

P:  5MAY2023 152863    28.0N  112.0W 3.5-5.1 AAAAA  Gulf of California         

 

O:  4MAY2023 04:48:36  39.6S   72.6W ML=4.2  EMSC   LOS LAGOS, CHILE             

P:  3MAY2023 153058    38.0S   74.0W 4.0-5.5 ABBAA  Central Chile              

 

 

AFRICA AND EUROPE

 

O:  4MAY2023 06:52:28  71.2N    8.4W ML=2.5  EMSC   JAN MAYEN ISLAND REGION      

P:  4MAY2023 153021    71.0N    8.0W 3.5-4.9 AAAAA  Jan Mayen Isl. area        

 

O:  3MAY2023 18:06:17  36.9N    3.6E mb=3.5  EMSC   NORTHERN ALGERIA             

P:  3MAY2023 152942    37.0N    5.0E 3.0-4.6 AAAAA  Western Mediterranean      

 

O: 03MAY2023 17:22:14  38.1N   36.6E ML=4.1  EMSC   CENTRAL TURKEY

O:  3MAY2023 17:16:40  38.1N   36.7E mb=4.8  EMSC   CENTRAL TURKEY               

P:  5MAY2023 152937    38.0N   36.0E 3.5-5.6 AAAAA  Turkey                     

 

NEIC reported this earthquake of M 4.9 in Central Turkey was felt with intensity II-III in the area(s) of Central Turkey in Elbistan and Kahramanmaras, Talas, Kayseri, Toprakkale, Gaziantep and Mersin.

 

O:  4MAY2023 01:50:00  40.4N   26.2E ML=4.2  EMSC   WESTERN TURKEY               

P:  4MAY2023 152975    40.0N   28.0E 3.0-5.3 AABAA  Romania/NW Turkey          

 

SOUTHWEST PACIFIC

 

O:  3MAY2023 14:22:48  18.0S  178.2W mb=4.3  EMSC   FIJI REGION                  

P:  7MAY2023 153034    18.0S  178.0W 4.0-5.4 BAAAA  Tonga Islands              

 

OCEAN RIDGES

 

O:  3MAY2023 23:25:50  53.1S  118.2W mb=5.3  EMSC   SOUTHERN EAST PACIFIC RISE   

 

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  4MAY2023 00:11:45  30.3S  177.4W mb=4.7  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  2MAY2023 153059    30.0S  177.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

O:  4MAY2023 06:51:08  33.2S  179.4W mb=5.0  EMSC   SOUTH OF KERMADEC ISLANDS    

O:  4MAY2023 00:42:01  33.4S  179.0E ML=4.4  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  7MAY2023 153064    34.0S  180.0W 4.0-5.4 BAAAA  So. Kermadec Islands       

 

O:  4MAY2023 00:42:01  33.4S  179.0E ML=4.4  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 10MAY2023 153060    35.0S  179.0E 3.0-4.4 CBAAA  North Island, N.Z.         

 

O:  3MAY2023 23:59:25  35.9S  178.4E ML=4.1  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P:  1MAY2023 153060    37.0S  178.0E 3.0-4.8 ABAAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

O:  3MAY2023 12:05:35  27.0N  143.8E mb=4.8  EMSC   BONIN ISLANDS, JAPAN REGION  

P:  6MAY2023 152861    28.0N  143.0E 4.0-5.5 BAAAA  Bonin Islands              

 

O:  4MAY2023 05:29:16  42.1N  141.0E mb=4.3  EMSC   HOKKAIDO, JAPAN REGION       

P:  8MAY2023 152951    41.0N  143.0E 3.5-5.5 BBBAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 03MAY2023 09:30:35  30.8N  116.3W ML=3.5  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 03MAY2023 09:27:37  31.1N  115.6W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO

O:  3MAY2023 10:39:18  30.7N  116.2W ML=3.5  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P:  3MAY2023 152917    31.0N  116.3W 2.5-4.6 AAAAA  So. California             

 

O:  3MAY2023 20:10:00  31.8N  116.3W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO      

P:  3MAY2023 152917    31.0N  116.3W 2.5-4.6 AAAAA  So. California             

 

O: 04MAY2023 06:39:18  32.4N  115.2W Ml=2.1  EMSC   BAJA CALIFORNIA, MEXICO

O:  3MAY2023 15:15:11  32.3N  115.3W Ml=2.1  EMSC   BAJA CALIFORNIA, MEXICO      

P:  2MAY2023 152918    32.7N  115.4W 2.5-4.7 AAAAA  So. California             

 

O:  3MAY2023 21:14:19  33.7N  116.8W ML=2.6  EMSC   SOUTHERN CALIFORNIA          

P:  6MAY2023 152924    33.9N  116.9W 2.5-4.8 BAAAA  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 Idyllwild, Hemet, Palm Springs, Winchester, Cathedral City, Mountain Center and Riverside among others.

 

O:  3MAY2023 11:43:37  35.9N  117.7W ML=2.9  EMSC   CENTRAL CALIFORNIA           

P:  4MAY2023 152925    35.4N  117.7W 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 Inyokern.

 

O:  3MAY2023 19:09:30  36.9N  121.6W Md=2.6  EMSC   CENTRAL CALIFORNIA           

P:  5MAY2023 152886    36.9N  121.7W 2.5-4.6 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.

 

ALASKA

 

 

O:  3MAY2023 16:52:38  53.4N  164.4W mb=4.0  EMSC   UNIMAK ISLAND REGION, ALASKA 

P:  4MAY2023 153004    52.5N  163.7W 3.5-4.9 AAAAA  Unimak Islands, Aleutians  

 

O:  4MAY2023 06:33:56  57.3N  143.1W ML=3.0  EMSC   GULF OF ALASKA               

P:  6MAY2023 153007    60.1N  139.4W 3.2-5.1 ACCAA  Central Alaska             

 

O: 03MAY2023 21:18:07  61.4N  150.1W ML=3.0  EMSC   SOUTHERN ALASKA

O:  3MAY2023 09:26:04  61.3N  150.5W ML=3.0  EMSC   SOUTHERN ALASKA              

P:  1MAY2023 153010    61.1N  150.2W 3.2-5.0 AAAAA  Central Alaska              

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  3MAY2023 23:12:22  43.3N  123.4W ML=2.0  EMSC   OREGON                       

P: 26APR2023 152695    45.3N  121.7W 2.0-4.1 CBBAA  Oregon state, U.S.         

 

O:  3MAY2023 11:06:57  60.6N  124.2W ML=3.2  EMSC   SOUTHERN YUKON TERRITORY, CANA

O: 03MAY2023 11:06:57  60.6N  124.2W MB=3.3  ECAN of Fort Liard, NT  

 

ROCKY MOUNTAINS REGION

 

 

O:  4MAY2023 01:50:49  31.7N  104.4W ML=2.2  EMSC   WESTERN TEXAS                

P:  4MAY2023 152915    31.5N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

O:  3MAY2023 23:13:25  37.2N  104.8W ML=3.4  EMSC   COLORADO                     

P:  2MAY2023 152891    37.1N  104.7W 2.0-4.3 AAAAA  Colorado area              

 

NEIC reported this earthquake of M 3.4 in Trinidad, Colorado was felt with intensity II-III in the area(s) of Trinidad, Colorado in Trinidad and in Raton, New Mexico.

 

EASTERN U.S./CANADA

 

O: 03MAY2023 18:48:46  34.5N   97.2W ML=2.1  EMSC   OKLAHOMA

O:  3MAY2023 08:09:21  34.5N   97.2W ML=2.5  EMSC   OKLAHOMA                     

P:  3MAY2023 152934    35.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

O:  3MAY2023 14:13:58  46.5N   76.4W ML=2.9  EMSC   SOUTHERN QUEBEC, CANADA      

O: 03MAY2023 14:13:58  46.5N   76.4W MB=2.9  ECAN of Kitigan Zibi, QC  

P:  4MAY2023 152963    47.0N   76.0W 2.0-3.9 AAAAA  New York State             

 

HAWAII

 

O:  3MAY2023 22:21:33  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII     

P:  6MAY2023 152864    19.4N  155.1W 4.0-5.8 BAAAA  Hawaii area                

 

MODERATE QUAKES IN NEW GUINEA, TONGA, YUNNAN, CHINA AND PANAMA

 

EARTHQUAKE SUMMARY FOR MAY 2, 2023

 

 

The strongest earthquake in the world today was an M 5.5 in Papua New Guinea. NEIC reported it was felt with intensity II-III in Papua New Guinea at Mount Hagen and Madang. It is likely that this activity is aftershocks of the M 7.0 in Papua New Guinea of April 2, 2023. The last event in this region of New Guinea with M>=5.0 was an aftershock of M 5.0 on April 24, 2023 which may have been promoted by the solar eclipse and new moon of April 20. Forecasts 152815 and 152821 had expected this activity was likely in New Guinea around May 2-4, 2023 within about 50 km of the M 5.5.

 

O:  2MAY2023 20:09:59   4.0S  142.7E Mw=5.5  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

O:  2MAY2023 07:34:22   3.0S  142.0E mb=4.8  EMSC   NEAR N COAST OF NEW GUINEA, PN

P:  2MAY2023 152815     4.0S  143.0E 4.0-5.6 AAAAA  New Ireland                

P:  4MAY2023 152821     4.0S  143.0E 4.0-5.4 AAAAA  Papua New Guinea           

 

A similar M 5.5 also occurred in northern Tonga today. NEIC reported it was felt with intensity II in Apia, Apia, Samoa. The last earthquake of M>=5.4 in this region of Tonga and Samoa within about 150 km of this epicenter occurred on December 8, 2022 with M 5.6 - an aftershock of an M 6.7 on December 4, 2022. Today's event is likely an aftershock of those in December, 2022. Forecasts 153034 and 153028 had expected this enhanced activity in Tonga/Samoa was likely around May2-4.

 

O:  2MAY2023 14:24:57  15.5S  173.0W mb=5.4  EMSC   SAMOA ISLANDS REGION         

P:  2MAY2023 153034    16.0S  173.0W 4.0-5.5 AAAAA  Tonga Islands              

P:  4MAY2023 153028    15.0S  174.0W 4.0-5.4 AAAAA  Samoa Islands              

 

An earthquake of M 5.1 hit the  northern coast of Panama today. NEIC reported it was felt in Panama with intensity II-III in Panama City, San Miguelito, Portobelo, Colon, Balboa, Veracru snd Rio Hato, Cocle and in Cartagena, Colombia. This is the strongest earthquake off northern Panama since an M

Forecast 152795 had expected today's event to the southwest was possible around May 3, 2023. A similar earthquake in Panama occurred yesterday and was reported in this summary as:

 

 

"A series of moderate earthquakes occurred in Panama today with M 4.3, 4.3 and 4.4. Two of these occurred within minutes of local solar noon and may have been promoted by energy from high tidal stresses which maximize near this hour. Forecasts 152524 and 152795 had expected this activity was likely in late April or early May, 2023. This activity is near the antipode of the M 7.3 in Sumatra of April 24 and may have been promoted by energy from that source." (May 2, 2023)

 

The last earthquake in Panama within about 100 km of today's epicenter with

M>=5.1 occurred on May 1, 2021 with M 5.4. The last strong earthquake in  this region was an M 6.1 on July 4, 2009 within about 50 km of today's epicenter.

 

 

O:  3MAY2023 02:12:30   9.4N   78.6W Mw=5.1  EMSC   PANAMA                       

P:  3MAY2023 152795     8.0N   83.0W 3.5-5.1 ABCAA  Costa Rica                 

 

An earthquake of M 5.3 also shook regions of Yunnan, China today. NEIC reported it was felt with intensity up to VII in Dali, Yunnan. The last earthquake in the Yunnan area of China of equal or larger magnitude was an M 5.4 on January 2, 2022 and an M 6.1 on May 21, 2021. At the time of this earthquake this summary noted in this regard:

 

"The earthquake of M 6.1 in Yunnan, China was the strongest within about 200 km of this epicenter since an M 6.6 about 200 km north of today's event on February 3, 1996, the only such event of M>=6.1 in the past 30 years." (May 21, 2021)

 

Forecasts 152868 and 152593 had expected today's activity in early May or late

April was likely within about 200 km of this epicenter.

 

O:  2MAY2023 15:27:25  25.4N   99.3E Mw=5.3  EMSC   YUNNAN, CHINA                

O: 02MAY2023 15:38:24  25.4N   99.3E mb=4.6  EMSC   YUNNAN, CHINA

P:  4MAY2023 152868    25.0N   95.0E 4.0-5.4 AACAA  Myanmar                    

P:  6MAY2023 152868    27.0N   97.0E 4.0-5.4 BBBAA  Myanmar                    

P: 23APR2023 152593    26.0N  101.0E 4.0-5.4 CABAA  Myanmar                    

 

A pair of moderate earthquake of M 4.6 and 4.9 occurred later in the day in China near the Sichuan-Guizhou border region. Forecast 152593 had expected this activity in late April.

 

O:  3MAY2023 05:04:06  28.2N  105.2E mb=4.9  EMSC   SICHUAN-GUIZHOU BORDER RG, CHI

O: 03MAY2023 04:08:24  28.3N  105.3E mb=4.6  EMSC   SICHUAN-GUIZHOU BORDER RG, CHINA

P: 23APR2023 152593    26.0N  101.0E 4.0-5.4 CCCAA  Myanmar                    

 

The earthquakes in Panama and China are at maximum stress longitudes with the coming full moon and appear to have been promoted by strong tidal stresses with the full moon of May 5, 2023 as noted in this summary:

 

"The full moon will arrive on May 5, 2023 at 17:34 UT. This full moon (Flower moon) will be accompanied by a lunar eclipse visible in the areas of Indonesia where the solar eclipse of April 20, 2023 was visible. Enhanced seismicity is expected in the next week in this region, but not as strongly as with the solar eclipse. Longitudes at local solar midnight with this full moon are near 100 E while those at local solar noon are near 80 West longitude. In the west these include areas of Central America near Panama, Costa Rica and Nicaragua and Colombia as well as areas of the western coast of South America and in the east areas of Sumatra, Indonesia, Mongolia, Sichuan and Yunnan, China among others. These longitudes area likely to see enhanced tidally-related seismicity in the next week with a moderately large to large earthquake likely. Tidal promotion of seismicity is not limited to these longitudes and is most likely near local solar noon and midnight when tidal stresses are maximized." (May 3, 2023)

 

The strongest earthquake in California today was an M 3.6 in Central California near Ridgecrest. NEIC reported it was felt with intensity II-III in California at Inyokern, Ridgecrest, Trona, Highland, Riverside, Moreno Valley, Caliesa, Moreno Valley. The last earthquake reported by NEIC with M>=3.6 within about 50 km of this epicenter occurred on February 28, 2023 also with M 3.6. The last event of larger magnitude in this area was an M 4.6 on July 15, 2022. Much of this is probably aftershock activity following the M 6.4 there on July 4, 2019.   Forecast 152925 had expected today's activity was likely within about 50 km around  May 4, 2023.

 

O: 02MAY2023 23:53:46  35.9N  117.7W ML=2.6  EMSC   CENTRAL CALIFORNIA

O: 02MAY2023 23:53:46  35.9N  117.7W ML=2.6  EMSC   CENTRAL CALIFORNIA

O: 03MAY2023 00:26:32  35.9N  117.7W Ml=2.3  EMSC   CENTRAL CALIFORNIA

O: 03MAY2023 01:40:23  35.9N  117.7W ML=3.4  EMSC   CENTRAL CALIFORNIA

O: 03MAY2023 01:40:23  35.9N  117.7W ML=3.6  ANSS   CENTRAL CALIFORNIA

O:  2MAY2023 07:09:39  35.6N  117.4W Ml=2.0  EMSC   SOUTHERN CALIFORNIA          

P:  4MAY2023 152925    35.4N  117.7W 2.5-4.6 AAAAA  So. California             

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of the Nias, Indonesia April 24, 2023, where promoted seismicity is considered likely.

 

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O:  3MAY2023 03:53:52  36.7N   71.2E mb=4.4  EMSC   HINDU KUSH REGION, AFGHANISTAN

O: 02MAY2023 10:31:51  37.1N   71.0E mb=4.6  EMSC   HINDU KUSH REGION, AFGHANISTAN

O: 03MAY2023 06:20:51  36.6N   71.2E mb=4.2  EMSC   HINDU KUSH REGION, AFGHANISTAN

P:  6MAY2023 152895    36.0N   70.0E 3.8-5.5 AAAAA  Hindu Kush/Pakistan        

P:  2MAY2023 152895    36.0N   69.0E 3.8-5.3 ABBAA  Hindu Kush/Pakistan        

 

O:  3MAY2023 01:32:27  38.5N   73.3E mb=4.3  EMSC   TAJIKISTAN                   

P:  8MAY2023 152896    38.0N   73.0E 3.8-5.6 BAAAA  Hindu Kush/Pakistan        

 

O: 02MAY2023 21:20:30  55.8N  160.8E mb=4.0  EMSC   KAMCHATKA PENINSULA, RUSSIA

O:  2MAY2023 09:59:17  55.7N  162.5E mb=4.1  EMSC   NEAR EAST COAST OF KAMCHATKA 

P:  2MAY2023 152993    55.0N  163.0E 4.0-5.8 AAAAA  Komandorsky Isl            

 

 

O:  2MAY2023 15:27:25  25.4N   99.3E Mw=5.3  EMSC   YUNNAN, CHINA                

O: 02MAY2023 15:38:24  25.4N   99.3E mb=4.6  EMSC   YUNNAN, CHINA

P:  4MAY2023 152868    25.0N   95.0E 4.0-5.4 AACAA  Myanmar                    

P:  6MAY2023 152868    27.0N   97.0E 4.0-5.4 BBBAA  Myanmar                     

P: 23APR2023 152593    26.0N  101.0E 4.0-5.4 CABAA  Myanmar                    

 

O:  3MAY2023 05:04:06  28.2N  105.2E mb=4.9  EMSC   SICHUAN-GUIZHOU BORDER RG, CHI

O: 03MAY2023 04:08:24  28.3N  105.3E mb=4.6  EMSC   SICHUAN-GUIZHOU BORDER RG, CHINA

P: 23APR2023 152593    26.0N  101.0E 4.0-5.4 CCCAA  Myanmar                    

 

INDONESIA AND PHILIPPINES

 

O:  2MAY2023 20:09:59   4.0S  142.7E Mw=5.5  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

O:  2MAY2023 07:34:22   3.0S  142.0E mb=4.8  EMSC   NEAR N COAST OF NEW GUINEA, PN

P:  2MAY2023 152815     4.0S  143.0E 4.0-5.6 AAAAA  New Ireland                

P:  4MAY2023 152821     4.0S  143.0E 4.0-5.4 AAAAA  Papua New Guinea           

 

O:  3MAY2023 01:23:05   3.4N  126.0E Mw=5.1  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  2MAY2023 152799     4.0N  126.0E 4.0-5.5 AAAAA  Mindanao, Philippines      

 

O:  3MAY2023 06:15:53   3.7S  128.7E mb=5.1  EMSC   SERAM, INDONESIA             

P:  3MAY2023 152827     3.0S  130.0E 4.0-5.4 AABAA  West Irian, PNG             

P:  6MAY2023 152808     4.0S  128.0E 4.0-5.4 BAAAA  Ceram area                 

 

O:  3MAY2023 00:17:44   4.8S  133.8E ML=4.1  EMSC   NEAR S COAST OF PAPUA, INDONES

P:  7MAY2023 152826     4.0S  133.0E 4.0-5.5 BAAAA  West Irian, PNG            

 

O:  2MAY2023 22:56:27   5.3S  102.4E ML=4.6  EMSC   SOUTHERN SUMATRA, INDONESIA  

P:  2MAY2023 152823     6.0S  103.0E 4.0-5.4 AAAAA  So. of Sumatera            

 

O:  2MAY2023 22:22:43   8.6S  121.3E mb=4.3  EMSC   FLORES REGION, INDONESIA     

P:  1MAY2023 152810     8.0S  121.0E 4.0-5.4 AAAAA  Flores Island area         

 

O:  2MAY2023 17:56:46   9.4S  114.2E mb=4.3  EMSC   SOUTH OF BALI, INDONESIA     

P:  3MAY2023 152822     9.0S  113.0E 4.0-5.4 AAAAA  So. of Bali                

 

NEIC reported this earthquake of M 4.3 South of Bali, Indonesia  was felt with intensity II-III in the area(s) of Bali, Indonesia in Kuta and Denpasar.

 

O:  2MAY2023 19:25:33  17.6N  122.4E ML=4.1  EMSC   LUZON, PHILIPPINES           

P:  2MAY2023 152841    13.0N  122.0E 3.5-4.9 ACAAA  Luzon, Philippines         

 

CENTRAL AND SOUTH AMERICA

 

O:  2MAY2023 15:11:57   8.7S   74.4W mb=4.5  EMSC   CENTRAL PERU                 

P:  3MAY2023 152806     8.0S   74.0W 3.5-5.4 AAAAA  Brazil                     

 

O:  3MAY2023 02:12:30   9.4N   78.6W Mw=5.1  EMSC   PANAMA                       

P:  3MAY2023 152795     8.0N   83.0W 3.5-5.1 ABCAA  Costa Rica                 

 

O:  3MAY2023 06:51:13  15.3N   94.8W ML=4.0  EMSC   OFF COAST OF OAXACA, MEXICO  

P:  2MAY2023 152834    15.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O:  2MAY2023 10:00:00  15.7N   92.5W ML=4.2  EMSC   CHIAPAS, MEXICO              

P:  3MAY2023 152837    14.0N   92.0W 3.5-5.1 ABAAA  Guatemala                  

P:  6MAY2023 152837    16.0N   92.0W 3.5-5.4 BAAAA  Guatemala                  

 

O:  3MAY2023 05:59:29  16.2N   97.6W ML=4.0  EMSC   OAXACA, MEXICO               

P:  4MAY2023 152852    16.0N   97.0W 3.5-5.5 AAAAA  Oaxaca, Mexico             

 

O:  3MAY2023 02:11:11  16.4S   73.0W mb=5.0  EMSC   NEAR COAST OF SOUTHERN PERU  

P:  4MAY2023 153031    16.0S   74.0W 4.0-5.5 AAAAA  So. Peru/Bolivia           

 

O:  3MAY2023 04:04:06  16.5N   95.2W ML=4.0  EMSC   OAXACA, MEXICO               

P:  2MAY2023 152834    15.0N   95.0W 3.5-5.3 ABAAA  Chiapas, Mexico            

P:  7MAY2023 152834    17.0N   95.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

 

O:  3MAY2023 01:51:07  18.7N  104.5W ML=4.1  EMSC   OFFSHORE COLIMA, MEXICO      

P:  4MAY2023 152845    19.0N  105.0W 3.5-5.3 AAAAA  Michoacan, Mexico          

 

O:  2MAY2023 13:01:59  19.1N   73.0W ML=3.0  EMSC   HAITI REGION                 

P:  4MAY2023 152860    20.0N   73.0W 3.0-5.0 AAAAA  Bahamas/No. Caribbean      

 

O:  3MAY2023 02:56:09  20.2N   71.1W ML=3.3  EMSC   DOMINICAN REPUBLIC REGION    

P:  5MAY2023 152855    19.0N   71.0W 3.4-5.5 ABAAA  Puerto Rico                

 

O:  2MAY2023 21:21:36  21.8S   68.6W mb=4.1  EMSC   ANTOFAGASTA, CHILE           

P:  1MAY2023 153042    22.0S   69.0W 4.0-5.8 AAAAA  Coast No. Chile            

 

O:  3MAY2023 06:33:08  22.1S   67.7W ML=4.1  EMSC   POTOSI, BOLIVIA              

P:  1MAY2023 153042    22.0S   69.0W 4.0-5.8 AAAAA  Coast No. Chile            

P:  5MAY2023 153038    21.0S   68.0W 4.0-5.6 ABAAA  Argentina                  

 

O:  2MAY2023 19:45:12  26.0N   99.9W ML=3.4  EMSC   NUEVO LEON, MEXICO           

P:  3MAY2023 152870    28.0N   98.0W 3.0-4.6 ABBAA  Northern Mexico            

 

O:  2MAY2023 13:55:54  29.1S   71.6W mb=4.3  EMSC   OFFSHORE ATACAMA, CHILE      

P:  4MAY2023 153041    28.0S   71.0W 4.0-5.6 ABAAA  Coast Central Chile        

 

AFRICA AND EUROPE

 

O:  3MAY2023 06:20:54  37.6N   35.6E ML=4.3  EMSC   CENTRAL TURKEY               

P:  5MAY2023 152937    38.0N   36.0E 3.5-5.6 AAAAA  Turkey                     

 

O:  2MAY2023 20:55:46  71.8N    1.4W Mw=4.1  EMSC   JAN MAYEN ISLAND REGION      

P: 28APR2023 152743    72.0N    0.0E 3.0-4.5 BAAAA  Norway                     

 

O: 02MAY2023 18:16:39  73.7N    8.1E Mw=3.6  EMSC   GREENLAND SEA

O:  2MAY2023 18:14:56  73.7N    8.0E Mw=3.7  EMSC   GREENLAND SEA                

P:  9MAY2023 153020    74.0N   14.0E 3.0-4.5 CAAAA  Norway                     

 

O:  2MAY2023 21:46:22  77.3N    8.2E Mw=3.0  EMSC   SVALBARD REGION              

P:  4MAY2023 153020    79.0N    7.0E 4.0-5.6 ABAAA  Arctic Ocean Region        

 

SOUTHWEST PACIFIC

 

O:  2MAY2023 14:24:57  15.5S  173.0W mb=5.4  EMSC   SAMOA ISLANDS REGION         

P:  2MAY2023 153034    16.0S  173.0W 4.0-5.5 AAAAA  Tonga Islands              

P:  4MAY2023 153028    15.0S  174.0W 4.0-5.4 AAAAA  Samoa Islands              

 

O:  2MAY2023 15:07:11  21.3S  173.7E mb=5.2  EMSC   VANUATU REGION               

O:  2MAY2023 15:36:32  21.9S  174.2E mb=4.8  EMSC   VANUATU REGION               

P:  3MAY2023 153053    23.0S  173.0E 4.0-5.5 ABAAA  Tonga/Fiji                 

P: 26APR2023 152773    21.0S  174.0E 4.0-5.5 AACAA  Tonga/Fiji                 

 

OCEAN RIDGES

 

O:  2MAY2023 22:33:49  30.5N   41.9W mb=4.5  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P:  4MAY2023 152866    29.0N   44.0W 4.0-5.6 ABCAA  Mid-Atlantic Ridge         

P:  5MAY2023 152908    31.0N   41.0W 4.0-5.7 BAAAA  No. Mid-Atlantic Ridge     

 

O:  2MAY2023 20:55:46  71.8N    1.4W Mw=4.1  EMSC   JAN MAYEN ISLAND REGION      

P: 28APR2023 152743    72.0N    0.0E 3.0-4.5 BAAAA  Norway                     

 

O: 02MAY2023 18:16:39  73.7N    8.1E Mw=3.6  EMSC   GREENLAND SEA

O:  2MAY2023 18:14:56  73.7N    8.0E Mw=3.7  EMSC   GREENLAND SEA                

P:  9MAY2023 153020    74.0N   14.0E 3.0-4.5 CAAAA  Norway                      

 

O:  2MAY2023 21:46:22  77.3N    8.2E Mw=3.0  EMSC   SVALBARD REGION              

P:  4MAY2023 153020    79.0N    7.0E 4.0-5.6 ABAAA  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:  2MAY2023 20:34:30  36.6N  141.0E ML=4.1  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  4MAY2023 152912    35.0N  141.0E 4.0-5.7 ABAAA  Off East Coast Honshu      

 

O:  3MAY2023 02:13:14  41.6N  144.4E mb=4.6  EMSC   HOKKAIDO, JAPAN REGION       

P:  8MAY2023 152951    41.0N  143.0E 3.5-5.5 BAAAA  Hokkaido, Japan            

 

O:  2MAY2023 11:24:54  44.8N  141.3E mb=4.5  EMSC   HOKKAIDO, JAPAN REGION       

P: 25APR2023 152699    46.0N  142.0E 3.5-5.5 CBAAA  So. Kurils                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O:  2MAY2023 21:26:10  30.6N  114.4W ML=3.4  EMSC   GULF OF CALIFORNIA           

P:  3MAY2023 152914    30.2N  114.1W 2.0-4.3 AAAAA  SW U.S.A                   

 

O: 03MAY2023 04:38:12  32.7N  115.5W Ml=2.1  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 03MAY2023 06:01:25  33.0N  116.0W Ml=2.5  EMSC   SOUTHERN CALIFORNIA

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 BAAAA  So. California             

 

O:  2MAY2023 07:09:39  35.6N  117.4W Ml=2.0  EMSC   SOUTHERN CALIFORNIA          

P:  4MAY2023 152925    35.4N  117.7W 2.5-4.6 AAAAA  So. California             

 

O:  3MAY2023 03:14:17  36.8N  121.6W ML=3.0  EMSC   CENTRAL CALIFORNIA           

P:  5MAY2023 152886    36.9N  121.7W 2.5-4.6 AAAAA  Central 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 San Juan Bautista, Salinas, Hollister.

 

O:  2MAY2023 08:08:29  37.3N  115.0W ml=2.1  EMSC   NEVADA                       

P: 30APR2023 152606    37.8N  115.8W 2.5-4.8 AAAAA  California/Nevada area     

 

O:  2MAY2023 08:39:46  37.4N  121.8W Md=2.0  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P:  3MAY2023 152887    37.9N  122.0W 2.5-4.5 AAAAA  Central California         

 

O:  3MAY2023 06:52:02  38.0N  115.1W ml=2.0  EMSC   NEVADA                       

P: 30APR2023 152606    37.8N  115.8W 2.5-4.8 BAAAA  California/Nevada area     

 

O:  3MAY2023 00:56:43  38.8N  122.9W Md=2.6  EMSC   NORTHERN CALIFORNIA          

P:  5MAY2023 152888    38.9N  122.8W 2.5-4.6 AAAAA  Central California         

 

O:  2MAY2023 20:15:39  39.2N  116.2W ml=3.3  EMSC   NEVADA                        

P:  9MAY2023 152883    38.7N  115.4W 2.5-4.9 CAAAA  California/Nevada area     

 

O: 02MAY2023 13:44:05  40.3N  124.4W Md=2.3  EMSC   OFFSHORE NORTHERN CALIFORNIA

O:  2MAY2023 22:10:03  40.4N  125.4W ML=2.9  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  3MAY2023 152967    40.5N  125.8W 2.5-4.6 AAAAA  Off Coast of No. Calif     

 

 

O: 02MAY2023 23:53:46  35.9N  117.7W ML=2.6  EMSC   CENTRAL CALIFORNIA

O: 02MAY2023 23:53:46  35.9N  117.7W ML=2.6  EMSC   CENTRAL CALIFORNIA

O: 03MAY2023 00:26:32  35.9N  117.7W Ml=2.3  EMSC   CENTRAL CALIFORNIA

O: 03MAY2023 01:40:23  35.9N  117.7W ML=3.4  EMSC   CENTRAL CALIFORNIA

O:  2MAY2023 07:09:39  35.6N  117.4W Ml=2.0  EMSC   SOUTHERN CALIFORNIA          

P:  4MAY2023 152925    35.4N  117.7W 2.5-4.6 AAAAA  So. California              

 

ALASKA

 

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

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O:  2MAY2023 16:26:48  45.9N  118.4W Ml=2.1  EMSC   OREGON                       

P: 26APR2023 152695    45.2N  120.1W 2.0-3.9 CABAA  Oregon state, U.S.         

 

O:  2MAY2023 23:11:02  48.8N  121.0W ML=2.5  EMSC   WASHINGTON                   

P:  2MAY2023 152979    48.9N  122.1W 2.0-4.2 AAAAA  Washington state, U.S.     

 

O:  2MAY2023 08:51:08  50.6N  130.4W MB=3.7  ECAN of Port Hardy, BC               

P:  4MAY2023 152988    50.9N  130.6W 3.0-5.2 AAAAA  British Colombia           

 

ROCKY MOUNTAINS REGION

 

O: 02MAY2023 14:03:34  31.7N  104.4W ML=2.9  EMSC   WESTERN TEXAS

O: 02MAY2023 19:12:48  31.7N  104.3W ML=2.5  EMSC   WESTERN TEXAS

O: 03MAY2023 04:13:57  31.7N  104.5W ML=2.3  EMSC   WESTERN TEXAS

O:  3MAY2023 02:51:53  31.6N  104.5W ML=2.1  EMSC   WESTERN TEXAS                

P:  4MAY2023 152915    31.5N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

NEIC reported this earthquake of M 2.5 in Western  Texas was felt with intensity II-III in the area(s) of Western  Texas in El Paso.

 

O:  2MAY2023 11:10:25  32.1N  101.1W ML=2.0  EMSC   WESTERN TEXAS                

P:  6MAY2023 152915    32.5N  101.6W 2.0-4.1 BAAAA  SW U.S.A                    

 

O:  2MAY2023 15:19:37  36.8N  104.8W ML=3.3  EMSC   NEW MEXICO                   

P:  2MAY2023 152891    37.1N  104.7W 2.0-4.3 AAAAA  Colorado area              

 

O:  2MAY2023 22:02:06  44.7N  114.4W Ml=2.3  EMSC   SOUTHERN IDAHO                

P:  4MAY2023 152958    44.4N  114.1W 2.0-3.9 AAAAA  Montana/Idaho              

 

O: 03MAY2023 04:22:04  44.3N  115.1W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 02MAY2023 17:25:08  44.4N  115.2W Ml=2.4  EMSC   SOUTHERN IDAHO

O: 02MAY2023 20:22:30  44.4N  115.2W Ml=2.1  EMSC   SOUTHERN IDAHO

O:  3MAY2023 04:22:04  44.3N  115.1W Ml=2.1  EMSC   SOUTHERN IDAHO               

P:  6MAY2023 152958    44.5N  115.2W 2.0-3.9 BAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O:  2MAY2023 21:47:42  29.1N   97.7W ML=2.0  EMSC   SOUTHERN TEXAS               

P:  3MAY2023 152870    28.0N   98.0W 3.0-4.6 ABAAA  Northern Mexico            

 

O:  3MAY2023 02:58:07  34.5N   97.2W ML=2.0  EMSC   OKLAHOMA                     

P:  3MAY2023 152934    35.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

O: 02MAY2023 11:46:04  38.4N   96.9W mb=2.3  EMSC   KANSAS

O:  2MAY2023 11:56:56  38.4N   96.8W mb=2.5  EMSC   KANSAS                       

P:  5MAY2023 152934    39.0N   99.0W 2.0-4.1 BABAA  Southern Plains             

 

NEIC reported this earthquake of M 2.5 near Wichita, Kansas  was felt with intensity II-III in the area(s) of near Wichita, Kansas in Elmdale and Marion.

 

O:  3MAY2023 01:38:03  36.9N   83.0W Md=2.5  EMSC   EASTERN KENTUCKY             

P:  2MAY2023 152897    36.0N   83.0W 2.0-4.1 AAAAA  Kentucky/Tennessee/NC      

 

NEIC reported this earthquake of M 2.5 in Kentucky was felt with intensity II-III in the area(s) of Kentucky in Cumberland, Partridge, Eolia, Baxter, Chappell, Harlan and in Virginia at Coeburn and Big Stone Gap.

 

O:  3MAY2023 14:13:58  46.5N   76.4W MB=2.9  ECAN of Kitigan Zibi, QC            

P:  4MAY2023 152963    47.0N   76.0W 2.0-3.9 AAAAA  New York State             

 

O:  2MAY2023 20:05:19  47.6N   70.1W MB=0.5  ECAN of La Malbaie, QC              

O: 02MAY2023 16:09:56  47.5N   70.4W MB=0.7  ECAN of Saint-Urbain, QC   

P:  4MAY2023 152956    47.0N   70.0W 2.0-4.6 AAAAA  Maine                      

 

O:  2MAY2023 13:47:37  49.2N   92.0W MB=1.6  ECAN of Ignace, ON                   

 

HAWAII

 

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

 

TONGA/FIJI STILL ACTIVE

 

EARTHQUAKE SUMMARY FOR MAY 1, 2023

 

The Tonga-Fiji-Kermadec Island arc has seen enhanced seismicity over the past two weeks including large earthquakes in the Kermadec, Tonga and Fiji Islands. This continued today with an  M 5.6 in Fiji. This earthquake was not reported felt. The last earthquake within about 150 km of this epicenter with M>=5.6 was an M 6.1 on July 2, 2021.  Forecast 153050 had expected today's event within about 50 km was likely around May 3, 2023.

 

O:  1MAY2023 10:55:56  22.3S  179.4W Mw=5.6  EMSC   SOUTH OF FIJI ISLANDS        

P:  3MAY2023 153050    22.0S  179.0W 4.0-5.5 AAAAA  Tonga Islands              

 

The current swarm in the region of the Ryukyu Islands, Japan continued today with M 4.6 and 5.3 events. This was partially addressed in the previous issue of this summary as:

 

 

"A moderately strong M 5.9 earthquake in the Ryukyu Islands, Japan occurred today after a series of moderate foreshocks including those of  M 5.3, 5.2 and 5.0. The foreshocks began with an M 5.3 on April 27 and continued through April 29, 2023. Today's event was reported by NEIC to have been felt with intensity II-II in Okinawa at Gushikawa, Okinawa, Chatan, Irasoe, Naha and Yomitan.

The last earthquake of M>=5.9 in the Okinawa area of the Ryukyu Islands within

about 200 km of today's epicenter was an M 6.0 on July 26, 2017 and also on September 26, 2016. Today's mainshock occurred within minutes of local solar noon and was probably promoted by high tidal stresses which maximize near this hour. Forecast 152873 had expected this activity about 100 km north of today's epicenter in early May. This activity is located at 144 degrees from the M 6.7 in Ecuador of March 18 and was probably promoted by energy from that source." (May 1, 2023)

 

The M 4.6 today occurred within minutes of local solar midnight and may have been promoted by tidal stresses which maximize near this hour.

 

NEIC reported this earthquake of M 5.4 in Okinawa, Ryukyu Islands, Japan was felt with intensity II-III in the area(s) of Okinawa, Ryukyu Islands, Japan in Gushikawa, Chatan, Okinawa and Yomitan.

 

O: 01MAY2023 15:55:19  26.0N  128.6E mb=4.6  EMSC   RYUKYU ISLANDS, JAPAN

O:  1MAY2023 07:59:39  26.0N  128.6E mb=5.3  EMSC   RYUKYU ISLANDS, JAPAN        

P:  3MAY2023 152873    27.0N  128.0E 4.0-5.4 AAAAA  Ryukyu Islands             

 

A series of moderate earthquakes occurred in Panama today with M 4.3, 4.3 and 4.4. Two of these occurred within minutes of local solar noon and may have been promoted by energy from high tidal stresses which maximize near this hour. Forecasts 152524 and 152795 had expected this activity was likely in late April or early May, 2023. This activity is near the antipode of the M 7.3 in Sumatra of April 24 and may have been promoted by energy from that source.

 

O: 01MAY2023 17:13:35   7.8N   80.9W ML=4.3  EMSC   PANAMA

O: 01MAY2023 17:22:14   7.8N   80.9W ML=4.3  EMSC   PANAMA

O:  1MAY2023 23:32:16   7.8N   80.8W ML=4.4  EMSC   PANAMA                       

P:  3MAY2023 152795     8.0N   83.0W 3.5-5.1 AABAA  Costa Rica                 

P: 25APR2023 152524     7.0N   82.0W 3.5-5.3 CAAAA  Costa Rica                 

 

The strongest earthquake felt in the U.S. or Canada today was an M 3.6 in Northern California about 75 km west of the Geysers. NEIC reported this earthquake of M 3.6 in Northern California was felt with intensity II-III in the area(s) of Northern California with IV in Point Arena and Gualala and III in Manchester, The Sea Ranch, Philo, Boonville, Elk and Yorkville, California. The last earthquake within about 50 km of this epicenter with M>=3.6 was an M 3.9 on November 22, 1997. Most activity at or above this magnitude in the region occurs 50-100 km to the northeast of this epicenter. Forecast 152614 had expected today's event was likely around April 29. This epicenter is located at 102 degrees from the major earthquakes in Turkey of February 6 and may have been promoted by energy from those earthquakes.

 

O:  1MAY2023 23:13:47  38.9N  123.7W Ml=3.6  EMSC   NORTHERN CALIFORNIA          

P: 29APR2023 152614    39.8N  123.5W 2.5-4.9 AAAAA  Central California         

 

 

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of the Nias, Indonesia April 24, 2023, where promoted seismicity is considered likely.

 

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

 

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O:  2MAY2023 04:46:22  41.7N   71.6E mb=4.7  EMSC   KYRGYZSTAN                   

P:  4MAY2023 152955    41.0N   73.0E 4.0-5.6 AAAAA  Kirgizstan/Xinjiang         

 

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

 

INDONESIA AND PHILIPPINES

 

O:  2MAY2023 01:21:43   0.5S  132.5E mb=4.7  EMSC   NEAR N COAST OF PAPUA, INDONES

P:  5MAY2023 152826     2.0S  134.0E 4.0-5.5 BBBAA  West Irian, PNG            

 

O:  2MAY2023 01:07:06   5.0N  126.3E ML=4.2  EMSC   MINDANAO, PHILIPPINES        

P:  2MAY2023 152799     4.0N  126.0E 4.0-5.5 AAAAA  Mindanao, Philippines      

P:  3MAY2023 152798     6.0N  127.0E 4.0-5.4 AAAAA  Halmahera                   

 

O:  1MAY2023 07:47:32   6.2S  130.3E ML=4.4  EMSC   BANDA SEA                    

P: 30APR2023 152555     6.0S  130.0E 4.0-5.7 AAAAA  West Irian, PNG            

 

O:  1MAY2023 16:30:34   6.2S  131.9E ML=4.3  EMSC   KEP. TANIMBAR REGION, INDONESI

P:  6MAY2023 152827     5.0S  131.0E 4.0-5.6 BBAAA  West Irian, PNG            

P:  8MAY2023 152828     7.0S  131.0E 4.0-5.5 CAAAA  West Irian, PNG            

 

O:  1MAY2023 07:54:06   9.4S  148.6E mb=5.0  EMSC   EASTERN NEW GUINEA REG., P.N.G

P:  2MAY2023 152817     6.0S  147.0E 4.0-5.4 ACBAA  New Ireland                

P:  6MAY2023 152816     6.0S  149.0E 4.0-5.4 BCAAA  New Ireland                

 

 

CENTRAL AND SOUTH AMERICA

 

O:  1MAY2023 09:31:10   7.4S   74.6W mb=5.2  EMSC   NORTHERN PERU                 

P:  3MAY2023 152806     8.0S   74.0W 3.5-5.4 AAAAA  Brazil                     

 

NEIC reported this earthquake of M 5.2 in Northern Peru was felt with intensity II-III in the area(s) of Northern Peru in Iquitos, Loreto.

 

O: 01MAY2023 17:13:35   7.8N   80.9W ML=4.3  EMSC   PANAMA

O: 01MAY2023 17:22:14   7.8N   80.9W ML=4.3  EMSC   PANAMA

O:  1MAY2023 23:32:16   7.8N   80.8W ML=4.4  EMSC   PANAMA                       

P:  3MAY2023 152795     8.0N   83.0W 3.5-5.1 AABAA  Costa Rica                  

P: 25APR2023 152524     7.0N   82.0W 3.5-5.3 CAAAA  Costa Rica                 

 

O:  1MAY2023 19:11:14  14.5S   74.2W ML=4.0  EMSC   CENTRAL PERU                 

P:  2MAY2023 153024    14.0S   73.0W 4.0-5.4 AAAAA  Central Peru               

 

O:  1MAY2023 07:59:31  14.8N   93.8W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P:  3MAY2023 152833    14.0N   94.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O:  2MAY2023 03:13:22  15.8N   96.5W ML=4.0  EMSC   OAXACA, MEXICO               

P:  4MAY2023 152852    16.0N   97.0W 3.5-5.5 AAAAA  Oaxaca, Mexico             

P: 30APR2023 152576    16.0N   97.0W 3.5-5.5 AAAAA  Oaxaca, Mexico             

 

O: 01MAY2023 13:07:09  16.5N   95.2W ML=4.5  EMSC   OAXACA, MEXICO

O:  1MAY2023 07:42:45  16.8N   94.2W ML=4.0  EMSC   OAXACA, MEXICO               

P:  2MAY2023 152834    15.0N   95.0W 3.5-5.3 ABAAA  Chiapas, Mexico            

P: 28APR2023 152560    16.0N   95.0W 3.5-5.2 BAAAA  Chiapas, Mexico            

 

O:  1MAY2023 23:44:06  17.5S   70.1W mb=4.1  EMSC   SOUTHERN PERU                

P:  2MAY2023 153031    17.0S   69.0W 4.0-5.7 AAAAA  So. Peru/Bolivia           

 

O:  2MAY2023 01:29:46  18.4N  101.5W ML=4.0  EMSC   GUERRERO, MEXICO             

P:  2MAY2023 152844    19.0N  102.0W 3.5-5.4 AAAAA  Michoacan, Mexico          

 

O:  1MAY2023 18:00:16  18.5N   66.2W ML=3.0  EMSC   PUERTO RICO REGION           

P:  2MAY2023 152854    19.0N   67.0W 3.4-5.5 AAAAA  Puerto Rico                

 

O: 01MAY2023 21:16:40  19.9N   70.3W ML=3.5  EMSC   DOMINICAN REPUBLIC REGION

O:  1MAY2023 19:35:41  18.5N   68.8W ML=3.8  EMSC   DOMINICAN REPUBLIC           

P:  4MAY2023 152854    18.0N   69.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O:  1MAY2023 21:43:01  18.5N   73.3W ML=3.8  EMSC   HAITI REGION                  

P:  4MAY2023 152860    20.0N   73.0W 3.0-5.0 BBAAA  Bahamas/No. Caribbean      

 

O:  2MAY2023 01:56:54  19.6N   70.8W ML=3.5  EMSC   DOMINICAN REPUBLIC           

P:  5MAY2023 152855    19.0N   71.0W 3.4-5.5 BAAAA  Puerto Rico                

 

O:  1MAY2023 10:25:04  21.4S   69.0W mb=4.3  EMSC   ANTOFAGASTA, CHILE           

P:  1MAY2023 153042    22.0S   69.0W 4.0-5.8 AAAAA  Coast No. Chile            

 

O:  1MAY2023 21:51:40  24.3S   67.5W mb=4.2  EMSC   SALTA, ARGENTINA             

P:  8MAY2023 153039    24.0S   67.0W 4.0-5.9 CAAAA  Argentina                  

 

 

AFRICA AND EUROPE

 

O:  1MAY2023 21:35:58  38.2N   38.6E ML=4.4  EMSC   EASTERN TURKEY               

P: 26APR2023 152660    38.0N   38.0E 3.5-5.1 BAAAA  Turkey                     

 

O:  1MAY2023 15:06:02  39.6N   20.6E Mw=4.2  EMSC   GREECE                       

P: 30APR2023 152630    39.0N   21.0E 3.0-4.6 AAAAA  No. Greece                 

 

SOUTHWEST PACIFIC

 

O:  1MAY2023 23:00:32  10.1S  161.1E mb=4.5  EMSC   SOLOMON ISLANDS               

P:  7MAY2023 153035    11.0S  161.0E 4.0-5.4 CAAAA  Vanuatu Islands            

 

O:  1MAY2023 10:55:56  22.3S  179.4W Mw=5.6  EMSC   SOUTH OF FIJI ISLANDS        

P:  3MAY2023 153050    22.0S  179.0W 4.0-5.5 AAAAA  Tonga Islands              

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  1MAY2023 22:15:41  33.6S  180.0E ML=4.3  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  1MAY2023 153063    31.0S  178.0E 4.0-5.4 ACBAA  So. Kermadec Islands       

 

O:  1MAY2023 11:59:57  30.0S  177.0W mb=5.1  EMSC   KERMADEC ISLANDS REGION      

P:  2MAY2023 153059    30.0S  177.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

O:  1MAY2023 16:39:59  44.1S  168.5E ML=4.2  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 01MAY2023 16:39:59  44.1S  168.5E MS=4.2  GEONET South Island, New Zealand

P:  3MAY2023 153069    44.0S  168.0E 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. 13 reports of felt intensity came from the area east and north of the epicenter with 12 weak, 1 light, 0 moderate, 0 strong, 0 severe and 0 extreme shaking.

 

 

JAPAN AND KURIL ISLANDS

 

O: 01MAY2023 15:55:19  26.0N  128.6E mb=4.6  EMSC   RYUKYU ISLANDS, JAPAN

O:  1MAY2023 07:59:39  26.0N  128.6E mb=5.3  EMSC   RYUKYU ISLANDS, JAPAN        

P:  3MAY2023 152873    27.0N  128.0E 4.0-5.4 AAAAA  Ryukyu Islands             

 

O:  1MAY2023 18:56:30  37.8N  141.7E ML=4.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

O: 01MAY2023 15:20:30  37.8N  141.8E ML=4.0  EMSC   NEAR EAST COAST OF HONSHU, JAPAN

P:  2MAY2023 152931    38.0N  143.0E 4.0-5.4 AAAAA  So. of Honshu              

 

O:  2MAY2023 03:39:17  45.9N  148.8E mb=4.2  EMSC   KURIL ISLANDS                

P:  2MAY2023 152952    43.0N  147.0E 3.5-5.5 ACBAA  Hokkaido, Japan            

P:  9MAY2023 152952    44.0N  150.0E 3.5-5.4 CBAAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O:  1MAY2023 08:08:38  30.9N  116.2W ML=3.5  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P:  3MAY2023 152917    31.0N  116.3W 2.5-4.6 AAAAA  So. California             

 

O: 01MAY2023 08:37:12  31.4N  115.3W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO

O: 01MAY2023 10:52:21  31.4N  115.3W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO

O:  1MAY2023 07:56:25  31.3N  115.3W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO      

P:  3MAY2023 152917    31.0N  116.3W 2.5-4.6 AAAAA  So. California             

 

O: 02MAY2023 04:29:37  32.7N  115.6W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 01MAY2023 20:36:50  33.0N  116.0W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 01MAY2023 21:21:24  33.0N  116.0W Ml=2.5  EMSC   SOUTHERN CALIFORNIA

O:  1MAY2023 21:35:47  32.7N  115.5W Ml=2.4  EMSC   SOUTHERN CALIFORNIA           

P:  2MAY2023 152918    32.7N  115.4W 2.5-4.7 AAAAA  So. California             

 

NEIC reported this earthquake of M 2.5 in Southern California was felt with intensity II-III in the area(s) of Southern California in El Centro and Calexico.

 

O:  1MAY2023 13:49:05  33.9N  116.8W ML=2.2  EMSC   SOUTHERN CALIFORNIA          

P:  6MAY2023 152924    33.9N  116.9W 2.5-4.8 BAAAA  So. California             

 

O:  2MAY2023 00:19:35  35.9N  117.5W ML=2.9  EMSC   CENTRAL CALIFORNIA           

P:  4MAY2023 152925    35.4N  117.7W 2.5-4.6 AAAAA  So. California             

P: 27APR2023 152650    35.9N  117.7W 2.5-4.4 BAAAA  So. California             

 

O:  1MAY2023 10:09:19  38.7N  122.9W Md=2.4  EMSC   NORTHERN CALIFORNIA          

O: 01MAY2023 20:40:18  38.8N  122.8W Md=2.4  EMSC   NORTHERN CALIFORNIA

P:  5MAY2023 152888    38.9N  122.8W 2.5-4.6 BAAAA  Central California         

 

O:  1MAY2023 23:13:47  38.9N  123.7W Ml=3.6  EMSC   NORTHERN CALIFORNIA          

P: 29APR2023 152614    39.8N  123.5W 2.5-4.9 AAAAA  Central California         

 

O:  2MAY2023 06:06:42  40.3N  121.9W Md=2.6  EMSC   NORTHERN CALIFORNIA          

P: 27APR2023 152690    40.7N  122.3W 2.5-4.6 BAAAA  Northern California        

 

O:  2MAY2023 06:10:01  41.3N  124.3W ML=2.7  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 27APR2023 152692    40.6N  124.9W 2.5-4.5 BAAAA  Off Coast of No. Calif     

 

ALASKA

 

O:  2MAY2023 02:04:01  56.4N  148.3W ml=3.3  EMSC   GULF OF ALASKA               

P:  5MAY2023 153015    55.0N  149.0W 3.0-5.0 BBAAA  Northern Alaska            

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 01MAY2023 10:28:42  51.3N  130.9W MB=3.2  ECAN of Bella Bella, BC  

O: 01MAY2023 01:18:50  51.4N  130.7W MB=3.2  ECAN of Bella Bella, BC  

O:  1MAY2023 11:00:46  51.4N  130.8W MB=3.2  ECAN of Bella Bella, BC             

P:  4MAY2023 152988    50.9N  130.6W 3.0-5.2 BAAAA  British Colombia           

 

O:  1MAY2023 05:45:56  48.5N  128.6W MB=3.1  ECAN of Tofino, BC                  

P: 26APR2023 152702    48.3N  128.5W 2.8-4.9 BAAAA  Vancouver Island area      

 

O: 29APR2023 10:09:43  59.3N  136.2W MB=3.0  ECAN of Skagway, AK                 

P:  4MAY2023 153003    59.0N  137.0W 3.0-4.4 BAAAA  Southeast Alaska           

 

O: 29APR2023 04:35:48  56.1N  116.6W MB=3.4  ECAN of Reno, AB    

O: 29APR2023 04:20:28  56.1N  116.6W MB=4.1  ECAN of Reno, AB                    

P:  2MAY2023 152983    56.0N  120.0W 2.0-4.4 BABAA  Alberta                    

 

ROCKY MOUNTAINS REGION

 

O:  1MAY2023 16:59:04  31.6N  104.2W ML=2.7  EMSC   WESTERN TEXAS                

O:  2MAY2023 02:35:35  31.7N  104.4W ML=2.9  EMSC   WESTERN TEXAS                

P:  4MAY2023 152915    31.5N  103.6W 2.0-4.1 AAAAA  SW U.S.A                   

 

O:  1MAY2023 21:55:29  42.6N  111.4W Ml=2.3  EMSC   SOUTHERN IDAHO                

P:  6MAY2023 152980    43.2N  111.0W 2.0-4.3 BAAAA  Yellowstone/Wyoming        

 

EASTERN U.S./CANADA

 

O: 30APR2023 08:40:27  47.5N   70.1W MB=0.6  ECAN of La Pocati├¿re, QC  

O: 30APR2023 01:47:20  47.0N   70.3W MB=1.9  ECAN of Cap-Saint-Ignace, QC   

O: 29APR2023 16:42:32  46.7N   71.1W MB=2.1  ECAN of Qu├⌐bec, QC   

O: 29APR2023 06:55:02  47.3N   70.3W MB=1.1  ECAN of Saint-Jean-Port-Joli, QC   

O: 30APR2023 21:20:38  47.6N   70.2W MB=1.9  ECAN of La Malbaie, QC              

P: 27APR2023 152685    47.0N   70.5W 2.0-4.4 BAAAA  New England                

 

O: 30APR2023 19:12:04  49.2N   92.0W MB=1.8  ECAN of Ignace, ON                  

 

O: 30APR2023 05:02:50  51.5N   92.9W MB=1.9  ECAN of Golden, ON                  

 

O: 30APR2023 13:43:03  48.7N   71.9W MB=3.0  ECAN of L'Ascension-de-Notre-Seigneur

P: 27APR2023 152685    47.0N   70.5W 2.0-4.4 BBAAA  New England                

 

O: 30APR2023 06:34:20  71.0N   72.7W MB=3.1  ECAN of Clyde River, NU             

P: 26APR2023 152742    72.0N   73.0W 2.5-4.1 BAAAA  Baffin/Davis Strait Canada 

 

O: 30APR2023 04:25:02  48.3N   69.3W MB=1.4  ECAN of Les Escoumins, QC           

P:  4MAY2023 152956    49.3N   67.5W 2.0-4.2 BABAA  Maine                      

 

O: 29APR2023 16:11:17  41.1N   55.4W MB=4.3  ECAN of Halifax, NS                 

 

O: 29APR2023 07:49:07  47.2N   78.4W MB=1.5  ECAN of Laforce, QC                 

P:  4MAY2023 152963    47.0N   76.0W 2.0-3.9 BABAA  New York State             

 

 

O: 02MAY2023 02:15:11  36.3N   89.5W mb=2.1  EMSC   TENNESSEE

O:  1MAY2023 18:45:54  36.2N   89.4W mb=2.7  EMSC   TENNESSEE                    

P: 25APR2023 152629    36.0N   89.0W 2.0-3.9 CAAAA  New Madrid area            

 

NEIC reported  earthquakes of M 2.6 and M 2.8 in SE Missouri and Tennessee were felt with intensity II-III in the area(s) of SE Missouri in Ridgely, Obion, Tiptonville, Union City, Martin, South Fulton, Dresden, Tennessee and in Clinton, Kentucky.

 

HAWAII

 

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

 

STRONG QUAKE IN RYUKYU ISLANDS, JAPAN

 

EARTHQUAKE SUMMARY FOR APRIL 30, 2023

 

 

A moderately strong M 5.9 earthquake in the Ryukyu Islands, Japan occurred today after a series of moderate foreshocks including those of  M 5.3, 5.2 and 5.0. The  foreshocks began with an M 5.3 on April 27 and continued through April 29, 2023. Today's event was reported by NEIC to have been felt with intensity II-II in Okinawa at Gushikawa, Okinawa, Chatan, Irasoe, Naha and Yomitan. The last earthquake of M>=5.9 in the Okinawa area of the Ryukyu Islands within about 200 km of today's epicenter was an M 6.0 on July 26, 2017 and also on September 26, 2016. Today's mainshock occurred within minutes of local solar noon and was probably promoted by high tidal stresses which maximize near this hour. Forecast 152873 had expected this activity about 100 km north of today's epicenter in early May. This activity is located at 144 degrees from the M 6.7 in Ecuador of March 18 and was probably promoted by energy from that source.

 

O: 01MAY2023 02:21:03  26.0N  128.6E Mw=5.3  EMSC   RYUKYU ISLANDS, JAPAN

O: 01MAY2023 02:22:31  26.0N  128.5E mb=5.2  EMSC   RYUKYU ISLANDS, JAPAN

O: 01MAY2023 03:22:12  26.1N  128.5E Mw=5.9  EMSC   RYUKYU ISLANDS, JAPAN

O: 01MAY2023 03:50:49  26.1N  128.7E mb=4.9  EMSC   RYUKYU ISLANDS, JAPAN

O:  1MAY2023 04:02:31  25.9N  128.5E mb=5.0  EMSC   RYUKYU ISLANDS, JAPAN        

P:  3MAY2023 152873    27.0N  128.0E 4.0-5.4 ABAAA  Ryukyu Islands             

 

An M 5.2 earthquake north of Sicily, Italy today was felt with intensity I in Bonifati, Calabria, Italy. The last earthquake within about 150 km of this epicenter with M>=5.2 in Italy occurred on October 31, 2022 with M 5.5 and before that on October 28, 2016 with M 5.8. Earthquakes in this area occur at intermediate to deep focal depths (250-500 km) and have little effect on surface features. The October 31, 2022 was, like today's event associated about a week after a solar eclipse on October 25 as noted in this summary at the time:

 

"A moderately strong earthquake occurred at intermediate depth in southern Italy today with M 5.5. It was reported by NEIC to have been felt with intensity III in Platania, Calabria, Italy. This event was likely promoted by tidal stresses which maximized at this longitude (15E) with the solar eclipse and new moon of October 25, 2022.

 

The solar eclipse was near maximum over this area of Italy on October 25.

 

Today's earthquake of M 5.1-5.5 in Italy is the strongest located within about 200 km  of this epicenter since an M 5.7-5.8 on October 26, 2006 and prior to that an M 5.9 on September 9, 1998." (October 31, 2022)

 

Forecasts 152626 and 152899 had expected today's activity within about 100 km  of the epicenter was likely in late April or early May, 2023. This epicenter is at the third node from the M 7.0 in New Guinea of April 2, 2023 and at 104 degrees from the M 7.2 in Molucca of January 18, 2023 and may have been promoted by energy from those sources.

 

O:  1MAY2023 02:41:26  39.5N   15.5E mb=5.0  EMSC   SOUTHERN ITALY               

O:  1MAY2023 02:41:26  39.5N   15.5E mb=5.2  ANSS   SOUTHERN ITALY               

P:  5MAY2023 152899    39.0N   15.0E 3.0-5.0 BAAAA  Mediterranean/Sicily       

P: 24APR2023 152626    39.0N   14.0E 3.0-4.8 CABAA  Mediterranean/Sicily       

 

Earthquakes continued in southern California near Mexicali today. These were felt with intensity up to IV in Calexico, El Centro, Heber, Imperial, California. Earthquakes also continued in the Niland area of southern California. These were discussed in the previous issue of this summary as:

 

"The current swarm of earthquakes in Southern California enhanced and accelerated today while migrating to the north. The strongest earthquakes in this swarm today were M 4.5 and occurred about 50 km north of the Calexico swarm of the past several days. NEIC reported today's events were widely felt south of the Salton Sea with maximum intensity V in Calipatria and II-III in Westmorland, Niland, Brawley, Imperial, Thermal, El Centro, Calexico and Mexicali, Baja California. The last earthquake in this area of Southern California of larger or equal magnitude to today's M 4.5 was an M 5.3 on June 5, 2021 and an M 4.6 on August 10, 2020 and prior to that an M 5.0 on March 24, 2009, fourteen years ago." (April 30, 2023)

 

The mainshocks of M 4.3 and 4.5 today occurred near local solar midnight and were probably promoted by string stresses which maximize near this hour.

Forecasts 152918 and 152642 had expected enhanced seismicity in this area in late April or early May, 2023. It is likely that this sequence will dissipate quickly. The following is a listing of events of M>=3 in the area today. A more extensive list can be found in the regional "CALIFORNIA" section of this summary. This activity is located at 102-105 degrees from the M 7.8 in Turkey of February 6 and the M 7.0 in New Guinea of April 2, 2023 and was probably promoted by energy from those sources.

 

O: 30APR2023 07:09:34  33.2N  115.6W mb=4.5  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:12:27  33.2N  115.6W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:58:18  33.2N  115.6W Mw=4.3  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 08:01:16  33.2N  115.6W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 11:44:03  33.2N  115.6W ML=3.1  EMSC   SOUTHERN CALIFORNIA

P:  2MAY2023 152918    32.7N  115.4W 2.5-4.7 AAAAA  So. California             

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 AAAAA  So. California             

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of the Nias, Indonesia April 24, 2023, where promoted seismicity is considered likely.

 

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 30APR2023 06:56:57  23.0N   94.4E mb=4.7  EMSC   MYANMAR                      

P:  1MAY2023 152868    23.0N   95.0E 4.0-5.6 AAAAA  Myanmar                    

P: 25APR2023 152592    23.0N   94.0E 4.0-5.5 BAAAA  Myanmar                    

 

O:  1MAY2023 00:13:41  27.7N   56.6E mb=4.3  EMSC   SOUTHERN IRAN                

P:  2MAY2023 152874    28.0N   55.0E 3.5-5.1 AABAA  So. Iran/Persian Gulf      

P: 28APR2023 152597    28.0N   55.0E 3.5-5.2 AABAA  So. Iran/Persian Gulf      

 

O:  1MAY2023 04:46:59  50.5N   90.8E mb=3.9  EMSC   RUSSIA-MONGOLIA BORDER REGION

P: 30APR2023 152726    50.0N   88.0E 3.0-4.4 AABAA  So. Siberia                

 

O: 30APR2023 19:50:27  54.5N  120.6E mb=4.3  EMSC   CHITINSKAYA OBLAST', RUSSIA  

P: 24APR2023 152726    57.0N  121.0E 3.0-4.4 CCAAA  So. Siberia                

 

O: 30APR2023 14:50:59  56.6N  161.1E mb=4.5  EMSC   NEAR EAST COAST OF KAMCHATKA

O:  1MAY2023 01:45:34  56.6N  161.4E mb=4.3  EMSC   NEAR EAST COAST OF KAMCHATKA 

P:  3MAY2023 152990    56.0N  162.0E 4.0-5.9 AAAAA  E. of Kamchatka            

 

 

INDONESIA AND PHILIPPINES

 

O: 30APR2023 16:29:03   1.5N  126.4E mb=5.2  EMSC   MOLUCCA SEA                  

P: 29APR2023 152527     2.0N  126.0E 4.0-5.4 AAAAA  Mindanao, Philippines      

 

O: 30APR2023 11:26:16   5.7S  146.5E mb=4.8  EMSC   EASTERN NEW GUINEA REG., P.N.G

P: 30APR2023 152545     6.0S  147.0E 4.0-5.5 AAAAA  New Ireland                

 

NEIC reported this earthquake of M 4.7 in New Guinea was felt with intensity II-III in the area(s) of New Guinea in Lae Morobe.

 

O: 30APR2023 11:28:04   8.1S  122.9E ML=4.0  EMSC   FLORES REGION, INDONESIA      

P:  1MAY2023 152810     8.0S  121.0E 4.0-5.4 AABAA  Flores Island area         

P: 29APR2023 152539     7.0S  123.0E 4.0-5.5 ABAAA  Flores Island area         

 

CENTRAL AND SOUTH AMERICA

 

O:  1MAY2023 05:18:13   6.1S   81.4W mb=4.9  EMSC   NEAR COAST OF NORTHERN PERU  

P: 10MAY2023 152819     6.0S   79.0W 4.0-5.6 CABAA  No. Peru                   

 

NEIC reported this earthquake of M 4.9 in Central Peru was felt with intensity II-III in the area(s) of Central Peru in Sechura, Piura.

 

O:  1MAY2023 06:30:37   7.5S   76.3W ML=4.3  EMSC   NORTHERN PERU                

P:  3MAY2023 152806     8.0S   74.0W 3.5-5.4 AABAA  Brazil                     

P: 29APR2023 152534     9.0S   75.0W 3.5-5.1 ABBAA  Brazil                     

 

O: 01MAY2023 03:32:38  15.4N   93.3W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO

O:  1MAY2023 06:38:44  13.8N   93.1W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P:  3MAY2023 152833    14.0N   94.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

P: 27APR2023 152559    14.0N   93.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

 

O:  1MAY2023 04:47:37  15.5N   95.0W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P:  2MAY2023 152834    15.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

P: 28APR2023 152560    16.0N   95.0W 3.5-5.2 BAAAA  Chiapas, Mexico            

 

O:  1MAY2023 06:28:33  16.1S   73.1W mb=4.6  EMSC   NEAR COAST OF SOUTHERN PERU  

P:  4MAY2023 153031    16.0S   74.0W 4.0-5.5 BAAAA  So. Peru/Bolivia           

 

NEIC reported this earthquake of M 4.6 in Southern Peru was felt with intensity II-III in the area(s) of Southern Peru in Camana, Arequipa.

 

O: 30APR2023 21:59:33  16.3N   98.2W ML=4.1  EMSC   OAXACA, MEXICO               

O: 30APR2023 16:26:24  16.3N   98.1W ML=4.0  EMSC   OAXACA, MEXICO

P:  1MAY2023 152851    17.0N   98.0W 3.5-5.5 AAAAA  Oaxaca, Mexico             

P: 30APR2023 152576    16.0N   97.0W 3.5-5.5 AAAAA  Oaxaca, Mexico             

 

O: 30APR2023 14:54:47  17.0N   94.2W ML=4.2  EMSC   OAXACA, MEXICO

O: 30APR2023 13:21:08  17.2N   94.9W ML=4.1  EMSC   VERACRUZ, MEXICO

O: 30APR2023 12:24:55  16.6N   94.8W ML=4.0  EMSC   OAXACA, MEXICO               

P: 28APR2023 152560    16.0N   95.0W 3.5-5.2 AAAAA  Chiapas, Mexico            

 

O: 30APR2023 07:21:02  17.0N   96.6W ML=4.0  EMSC   OAXACA, MEXICO                

P: 30APR2023 152576    16.0N   97.0W 3.5-5.5 AAAAA  Oaxaca, Mexico             

 

O: 30APR2023 15:11:13  17.9N  101.5W ML=4.1  EMSC   GUERRERO, MEXICO             

P:  2MAY2023 152843    17.0N  101.0W 3.5-5.6 AAAAA  Michoacan, Mexico           

P: 28APR2023 152570    18.0N  101.0W 3.5-5.3 AAAAA  Michoacan, Mexico          

 

O:  1MAY2023 04:28:48  18.1N   67.0W Md=3.0  EMSC   PUERTO RICO                  

P:  2MAY2023 152854    19.0N   67.0W 3.4-5.5 AAAAA  Puerto Rico                

 

O: 30APR2023 17:42:22  18.7N  103.9W ML=4.0  EMSC   OFFSHORE COLIMA, MEXICO

O: 30APR2023 15:48:33  18.6N  103.9W mb=4.6  EMSC   OFFSHORE COLIMA, MEXICO      

P:  1MAY2023 152845    18.0N  103.0W 3.5-5.4 AAAAA  Michoacan, Mexico          

P: 25APR2023 152571    18.0N  103.0W 3.5-5.5 BAAAA  Michoacan, Mexico          

 

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

 

O: 30APR2023 11:15:52  18.3N   66.6W Md=3.2  EMSC   PUERTO RICO

O:  1MAY2023 04:15:33  18.8N   67.3W Md=3.0  EMSC   PUERTO RICO REGION           

O: 30APR2023 10:51:04  18.8N   67.3W Md=3.2  EMSC   PUERTO RICO REGION

O: 01MAY2023 00:46:53  19.0N   66.8W Md=3.1  EMSC   PUERTO RICO REGION

O: 01MAY2023 00:49:00  19.0N   66.8W Md=3.1  EMSC   PUERTO RICO REGION

O: 01MAY2023 00:52:12  19.0N   66.8W Md=3.4  EMSC   PUERTO RICO REGION

P: 30APR2023 152583    20.0N   67.0W 3.0-4.8 ABAAA  Bahamas/No. Caribbean      

P:  2MAY2023 152854    19.0N   67.0W 3.4-5.5 AAAAA  Puerto Rico                

 

O:  1MAY2023 03:17:46  19.2N   64.7W Md=3.5  EMSC   VIRGIN ISLANDS REGION        

P:  2MAY2023 152859    20.0N   65.0W 3.0-4.7 AAAAA  Bahamas/No. Caribbean      

P: 27APR2023 152566    19.0N   65.0W 3.0-5.2 BAAAA  Leeward Islands            

 

O: 30APR2023 18:03:02  20.8S   67.8W mb=4.4  EMSC   POTOSI, BOLIVIA              

P: 26APR2023 152763    22.0S   69.0W 4.0-5.9 BBAAA  Coast No. Chile            

 

O: 30APR2023 16:39:09  23.4S   70.0W mb=4.7  EMSC   ANTOFAGASTA, CHILE           

 

O: 30APR2023 16:39     23.3S   69.9W mb=4.6  GUC    Antofagasta at Sierra Gorda, I

P: 26APR2023 152763    22.0S   69.0W 4.0-5.9 BBAAA  Coast No. Chile            

P:  1MAY2023 153042    22.0S   69.0W 4.0-5.8 ABAAA  Coast No. Chile            

 

GUC reported this earthquake was felt with intensity IV in  Antofagasta at Sierra Gorda, III in Antofagasta and II in Calama, Chile.

 

O: 30APR2023 08:47:04  28.1N  112.3W ML=3.6  EMSC   GULF OF CALIFORNIA           

P:  5MAY2023 152863    28.0N  112.0W 3.5-5.1 BAAAA  Gulf of California         

 

 

AFRICA AND EUROPE

 

O: 30APR2023 13:22:47  20.5S   33.6E ML=3.3  EMSC   MOZAMBIQUE                   

P:  1MAY2023 153047    21.0S   33.0E 4.0-5.6 AAAAA  So. Indian Ocean           

P: 22APR2023 152766    21.0S   33.0E 4.0-5.8 CAAAA  So. Indian Ocean           

 

O: 30APR2023 13:01:28  38.3N   37.8E ML=4.3  EMSC   CENTRAL TURKEY               

P:  5MAY2023 152937    38.0N   36.0E 3.5-5.6 BABAA  Turkey                     

P: 26APR2023 152660    38.0N   38.0E 3.5-5.1 BAAAA  Turkey                     

 

NEIC reported this earthquake of M 4.1 in Central Turkey was felt with intensity II-III in the area(s) of Central Turkey in Malatya and Kayseri.

 

O:  1MAY2023 02:41:26  39.5N   15.5E mb=5.0  EMSC   SOUTHERN ITALY               

P:  5MAY2023 152899    39.0N   15.0E 3.0-5.0 BAAAA  Mediterranean/Sicily       

P: 24APR2023 152626    39.0N   14.0E 3.0-4.8 CABAA  Mediterranean/Sicily       

 

O: 30APR2023 22:02:43  41.3N   45.9E ML=2.9  EMSC   GEORGIA (SAK'ART'VELO)       

P:  2MAY2023 152947    40.0N   44.0E 3.5-4.9 ABBAA  Caucasus/Caspian Sea       

 

O: 30APR2023 10:02:49  42.2N   48.0E mb=4.2  EMSC   CAUCASUS REGION, RUSSIA      

P: 23APR2023 152676    40.0N   50.0E 4.0-5.8 CCBAA  Kazakhstan                  

 

SOUTHWEST PACIFIC

 

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

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O:  1MAY2023 00:16:18  29.8S  177.3W Mw=5.1  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  2MAY2023 153059    30.0S  177.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

P: 28APR2023 152765    28.0S  176.0W 4.0-5.7 AAAAA  No. Kermadec Islands       

 

JAPAN AND KURIL ISLANDS

 

O: 01MAY2023 02:21:03  26.0N  128.6E Mw=5.3  EMSC   RYUKYU ISLANDS, JAPAN

O: 01MAY2023 02:22:31  26.0N  128.5E mb=5.2  EMSC   RYUKYU ISLANDS, JAPAN

O: 01MAY2023 03:22:12  26.1N  128.5E Mw=5.9  EMSC   RYUKYU ISLANDS, JAPAN

O: 01MAY2023 03:50:49  26.1N  128.7E mb=4.9  EMSC   RYUKYU ISLANDS, JAPAN

O:  1MAY2023 04:02:31  25.9N  128.5E mb=5.0  EMSC   RYUKYU ISLANDS, JAPAN        

P:  3MAY2023 152873    27.0N  128.0E 4.0-5.4 ABAAA  Ryukyu Islands             

 

O: 30APR2023 20:04:21  36.4N  140.6E mb=4.3  EMSC   NEAR EAST COAST OF HONSHU, JAPAN

O: 30APR2023 23:51:05  36.6N  140.8E mb=4.5  EMSC   NEAR EAST COAST OF HONSHU, JAPAN

O: 01MAY2023 03:56:30  37.7N  141.6E ML=4.1  EMSC   NEAR EAST COAST OF HONSHU, JAPAN

O: 30APR2023 12:21:42  35.5N  141.4E mb=4.4  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  4MAY2023 152912    35.0N  141.0E 4.0-5.7 BAAAA  Off East Coast Honshu      

P: 25APR2023 152636    35.0N  140.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

NEIC reported this earthquake of M 4.4 off eastern Honshu, Japan  was felt with intensity II-III in the area(s) of Honshu, Japan in Tochigi and Chiba Prefectures.

 

 

O: 30APR2023 18:45:50  29.1N  139.5E mb=4.3  EMSC   IZU ISLANDS, JAPAN REGION    

P: 27APR2023 152635    30.0N  142.0E 4.0-5.5 BABAA  Off East Coast Honshu      

 

O: 30APR2023 23:58:20  42.1N  142.5E mb=4.4  EMSC   HOKKAIDO, JAPAN REGION       

P: 28APR2023 152672    41.0N  142.0E 3.5-5.4 ABAAA  Hokkaido, Japan            

 

O: 30APR2023 15:47:51  48.5N  155.5E mb=4.7  EMSC   KURIL ISLANDS                

P:  2MAY2023 152961    48.0N  155.0E 3.5-5.6 AAAAA  NE Pacific                 

P: 26APR2023 152683    49.0N  155.0E 3.5-5.5 BAAAA  NE Pacific                 

 

 

O: 30APR2023 16:37:51  48.7N  155.3E mb=4.7  EMSC   KURIL ISLANDS

O: 30APR2023 10:02:25  48.8N  155.7E mb=4.3  EMSC   KURIL ISLANDS

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 30APR2023 19:32:40  34.2N  117.8W Ml=2.4  EMSC   SOUTHERN CALIFORNIA          

P:  2MAY2023 152920    33.6N  118.5W 2.5-4.9 AAAAA  So. California             

P: 30APR2023 152645    35.0N  117.7W 2.5-4.7 AAAAA  So. California             

 

O:  1MAY2023 04:21:14  38.8N  122.8W Md=2.0  EMSC   NORTHERN CALIFORNIA          

P:  5MAY2023 152888    38.9N  122.8W 2.5-4.6 BAAAA  Central California         

 

O: 30APR2023 18:40:43  40.2N  121.0W Md=2.5  EMSC   NORTHERN CALIFORNIA          

P:  3MAY2023 152884    39.8N  120.6W 2.5-4.6 AAAAA  Central California         

P: 29APR2023 152615    39.4N  120.5W 2.5-4.6 AAAAA  Central California          

 

NEIC reported this earthquake of M 2.5 in Northern California was felt with intensity II-III in the area(s) of Northern California in Grass Valley.

 

O: 30APR2023 18:32:56  30.6N  116.3W ML=3.7  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 30APR2023 19:16:38  30.6N  116.1W ML=3.6  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 30APR2023 09:34:56  30.7N  116.2W ML=3.6  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 30APR2023 09:44:38  30.8N  116.3W ML=3.6  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 30APR2023 21:36:45  30.8N  116.1W ML=3.5  EMSC   BAJA CALIFORNIA, MEXICO

O: 30APR2023 07:05:26  30.9N  116.1W ML=3.5  EMSC   BAJA CALIFORNIA, MEXICO

O: 30APR2023 10:32:39  30.9N  116.1W ML=3.5  EMSC   FFSHORE BAJA CALIFORNIA, MEXICO

O: 30APR2023 19:41:59  30.9N  116.2W ML=3.4  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 30APR2023 19:58:18  30.3N  116.0W ML=3.4  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P:  3MAY2023 152917    31.0N  116.3W 2.5-4.6 BAAAA  So. California             

 

O: 01MAY2023 02:04:31  32.7N  115.5W Ml=2.6  EMSC   SOUTHERN CALIFORNIA

O: 01MAY2023 02:52:55  33.0N  116.0W Ml=2.4  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:09:34  33.2N  115.6W mb=4.5  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:12:27  33.2N  115.6W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:19:16  33.2N  115.6W Ml=2.9  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:21:37  33.2N  115.6W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:22:40  33.2N  115.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:27:39  33.2N  115.6W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:30:12  33.2N  115.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:32:12  33.2N  115.6W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:58:18  33.2N  115.6W Mw=4.3  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 08:01:16  33.2N  115.6W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 08:04:06  33.2N  115.6W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 08:06:04  33.2N  115.6W Ml=2.4  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 08:08:28  33.2N  115.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 08:14:01  33.2N  115.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 09:04:21  33.2N  115.6W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 09:08:03  33.2N  116.1W Ml=2.5  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 11:44:03  33.2N  115.6W ML=3.1  EMSC   SOUTHERN CALIFORNIA

O:  1MAY2023 02:15:12  32.4N  115.3W Ml=2.7  EMSC   BAJA CALIFORNIA, MEXICO      

P:  2MAY2023 152918    32.7N  115.4W 2.5-4.7 AAAAA  So. California             

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 AAAAA  So. California             

 

ALASKA

 

O:  1MAY2023 01:20:48  56.8N  158.0W ML=3.2  EMSC   ALASKA PENINSULA             

P:  3MAY2023 152982    54.7N  156.9W 3.5-5.9 ABAAA  Alaska Peninsula           

 

O:  1MAY2023 01:31:39  57.1N  155.4W ML=3.2  EMSC   ALASKA PENINSULA             

P:  3MAY2023 152982    54.7N  156.9W 3.5-5.9 ABBAA  Alaska Peninsula           

 

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

 

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:  1MAY2023 01:18:29  34.5N   97.2W ML=2.1  EMSC   OKLAHOMA                     

P:  3MAY2023 152934    35.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

P: 26APR2023 152656    34.0N   97.0W 2.0-4.4 BAAAA  Southern Plains            

 

HAWAII

 

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

 

SEISMICITY IN SOUTHERN CALIFORNIA EXPANDS

 

EARTHQUAKE SUMMARY FOR APRIL 29, 2023

 

 

The current swarm of earthquakes in Southern California enhanced and accelerated today while migrating to the north. The strongest earthquakes in this swarm today were M 4.5 and occurred about 50 km north of the Calexico swarm of the past several days. NEIC reported today's events were widely felt south of the Salton Sea with maximum intensity V in Calipatria and II-III in Westmorland, Niland, Brawley, Imperial, Thermal, El Centro, Calexico and Mexicali, Baja California. The last earthquake in this area of Southern California of larger or equal magnitude to today's M 4.5 was an M 5.3 on June 5, 2021 and an M 4.6 on August 10, 2020 and prior to that an M 5.0 on March 24, 2009, fourteen years ago. At the time of the M 5.3 on June 5, 2021 (the largest event in this area in at least 35 years) this summary noted:

 

"Today's activity in Southern California continues a series of enhanced earthquakes in the area which followed the M 7.4 in the area of Qinghai, China of May 21. These have been followed by this summary as the area is at or near 103 degrees from the Qinghai epicenter. This is a distance at which seismic energy is strongly concentrated from large surface disturbances due to reflection and refraction of the energy from internal earth boundaries back to the surface. Seismicity is often seen to increase substantially at this distance following major earthquakes. Several swarms have occurred in Baja and Southern California since May 21, the date of the Qinghai quake." (June 5, 2021)

 

Forecast 152642 had expected enhanced seismicity with magnitude up to M 4.5 was likely in the area around April 30. The following is a list of events in this swarm of M>=2.9 today. A more extensive listing can be found in the "CALIFORNIA" regional listing below.

 

O: 30APR2023 07:12:27  33.2N  115.6W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:19:16  33.2N  115.6W Ml=2.9  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:32:12  33.2N  115.6W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:09:34  33.2N  115.6W mb=4.5  EMSC   SOUTHERN CALIFORNIA          

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 AAAAA  So. California             

 

The swarm in the Calexico, California also continued today. Earthquakes of M 4.1 and 3.7 was reported by NEIC to have been felt with intensity IV in Calexico, Heber, El Centro, Mexicali,  and II-III in Holtville, El Centro, Imperia and in Mexicali and Puebla, Baja California. An M 3.4 was also felt north of this in the area of Thermal, California with intensity II. This summary noted this activity in the previous issue as:

 

"The strong series of events in the Baja-California border area near Calexico, California continued today unabated.  NEIC reported these earthquakes of M 3.2, 2.5, 2.5, 2.7 and 2.9 in Southern California were felt with intensity II-III in the area(s) of Southern California in Mexicali, Calexico (IV), Heber (IV), El Centro, Winterhaven, Progreso, Holtville  and Imperial and in Baja Californiat with IV at Puebla. Earthquake series in this region follow a pattern unlike those in most other areas. They often start out with a series of minor earthquakes, then a brief quiet period, a second period of larger events, another brief quiet period and a final period with moderate to large earthquake(s). This appears to be case in the current situation which may be controlled by moderate solar flares and the geomagnetic storm. Expect further enhanced seismicity in this region in the next several days. As the largest event in this series today was M 2.9, it appears to be a quiet period with more active conditions coming in the next day.  Forecast 152642 had expected today's sequence was likely around April 30.  This activity is at 102 degrees from the M 7.0 in New Guinea of April 2, 2023 and near 104 degrees from the major earthquakes in Turkey of February 6, 2023 and is likely to have been promoted by energy from that source." (April 29, 2023)

 

The following is a list of events in this swarm of M>=2.9 today. A more extensive listing can be found in the "CALIFORNIA" regional listing below.

 

O: 29APR2023 12:09:10  32.7N  115.6W ML=3.1  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 21:06:47  32.7N  115.6W ML=3.7  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 21:08:01  32.7N  115.6W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 06:39:56  32.7N  115.5W Ml=3.0  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 12:07:00  32.8N  115.6W Mw=4.1  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 05:55:59  33.0N  116.0W ML=3.1  EMSC   SOUTHERN CALIFORNIA           

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 AAAAA  So. California             

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of the Nias, Indonesia April 24, 2023, where promoted seismicity is considered likely.

 

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 30APR2023 06:56:57  23.0N   94.4E mb=4.7  EMSC   MYANMAR                      

P: 25APR2023 152592    23.0N   94.0E 4.0-5.5 BAAAA  Myanmar                     

 

O: 29APR2023 23:45:34  35.1N   74.5E ML=4.1  EMSC   NORTHWESTERN KASHMIR         

P: 28APR2023 152639    34.0N   74.0E 3.8-5.2 ABAAA  Pakistan                   

 

O: 30APR2023 00:40:48  36.8N   71.5E mb=4.1  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 27APR2023 152621    36.0N   71.0E 3.8-5.2 BAAAA  Hindu Kush/Pakistan        

 

O: 30APR2023 03:11:39  53.0N   99.2E mb=4.2  EMSC   IRKUTSKAYA OBLAST', RUSSIA   

P: 27APR2023 152726    51.0N   98.0E 3.0-4.4 BBAAA  So. Siberia                

 

O: 30APR2023 01:14:17  56.7N  161.4E mb=4.3  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 24APR2023 152719    55.0N  163.0E 4.0-6.1 CBAAA  Komandorsky Isl            

 

O: 30APR2023 00:09:37  69.9N  154.2E ML=4.9  EMSC   NORTHEASTERN SAKHA, RUSSIA   

 

 

INDONESIA AND PHILIPPINES

 

O: 30APR2023 01:26:33   4.8S  133.9E mb=4.7  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 29APR2023 22:37:57   4.9S  133.9E mb=5.0  EMSC   NEAR S COAST OF PAPUA, INDONES

P: 24APR2023 152554     2.0S  134.0E 4.0-5.4 BCAAA  West Irian, PNG             

 

O: 29APR2023 07:03:53   5.1S  153.5E mb=5.1  EMSC   NEW IRELAND REGION, P.N.G.   

P: 28APR2023 152542     7.0S  154.0E 4.0-5.4 ABAAA  New Britain                

 

O: 29APR2023 14:00:43   7.3S  129.6E ML=4.1  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 24APR2023 152555     7.0S  130.0E 4.0-5.7 BAAAA  West Irian, PNG            

P: 30APR2023 152555     6.0S  130.0E 4.0-5.7 ABAAA  West Irian, PNG            

 

O: 29APR2023 08:32:20   7.7S  119.4E ML=4.0  EMSC   FLORES SEA                   

P: 26APR2023 152553     8.0S  119.0E 4.0-5.6 BAAAA  Sumbawa Island area        

 

O: 29APR2023 15:12:41  10.2S  120.3E ML=4.4  EMSC   SUMBA REGION, INDONESIA      

P: 23APR2023 152754    11.0S  119.0E 4.0-5.8 CABAA  So. of Indonesia           

 

O: 30APR2023 04:44:31  10.5N  125.8E mb=4.3  EMSC   LEYTE, PHILIPPINES           

P: 21APR2023 152567    10.0N  125.0E 3.5-4.9 CAAAA  Luzon, Philippines         

 

O: 30APR2023 04:07:41  10.8S  113.4E mb=4.5  EMSC   SOUTH OF JAVA, INDONESIA     

P: 25APR2023 152548     9.0S  113.0E 4.0-5.6 BBAAA  So. of Bali                

 

 

CENTRAL AND SOUTH AMERICA

 

O: 30APR2023 03:33:52   5.0S   81.0W mb=4.4  EMSC   NEAR COAST OF NORTHERN PERU  

P: 24APR2023 152538     4.0S   80.0W 4.0-5.6 CAAAA  Ecuador                    

 

O: 30APR2023 03:00:50  12.1N   87.8W mb=4.2  EMSC   NEAR COAST OF NICARAGUA      

P: 26APR2023 152573    13.0N   87.0W 3.5-5.3 BAAAA  Nicaragua                  

 

O: 29APR2023 16:05:30  13.1N   89.2W ML=4.1  EMSC   OFFSHORE EL SALVADOR         

P: 27APR2023 152561    14.0N   89.0W 3.5-5.1 AAAAA  Coast of Central America   

 

O: 30APR2023 04:59:17   9.3N   69.8W mb=4.6  EMSC   PORTUGUESA, VENEZUELA        

P: 28APR2023 152532     9.0N   70.0W 4.0-5.4 AAAAA  Venezuela                  

 

O: 29APR2023 07:30:26  14.3N   92.3W ML=4.2  EMSC   OFFSHORE GUATEMALA

O: 30APR2023 04:44:53  13.9N   92.1W ML=4.0  EMSC   OFFSHORE GUATEMALA           

P: 29APR2023 152564    13.0N   91.0W 3.5-5.1 AAAAA  Guatemala                  

 

O: 29APR2023 21:11:24  14.4N   93.9W ML=4.0  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 27APR2023 152559    14.0N   93.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 29APR2023 09:34:38  15.6N   95.5W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO      

P: 28APR2023 152560    16.0N   95.0W 3.5-5.2 AAAAA  Chiapas, Mexico            

 

O: 30APR2023 07:21:02  17.0N   96.6W ML=4.0  EMSC   OAXACA, MEXICO

O: 29APR2023 20:48:34  17.0N   95.5W ML=4.2  EMSC   OAXACA, MEXICO               

P: 27APR2023 152576    17.0N   96.0W 3.5-5.4 AAAAA  Oaxaca, Mexico              

 

O: 30APR2023 04:34:43  18.6N   67.9W Md=3.3  EMSC   DOMINICAN REPUBLIC REGION    

P: 29APR2023 152579    19.0N   69.0W 3.4-5.3 AAAAA  Puerto Rico                

P: 30APR2023 152583    20.0N   67.0W 3.0-4.8 ABAAA  Bahamas/No. Caribbean      

 

O: 29APR2023 13:23:39  28.0N  112.6W ML=3.8  EMSC   GULF OF CALIFORNIA           

P: 23APR2023 152587    25.0N  113.0W 3.5-5.1 CCAAA  Gulf of California         

 

AFRICA AND EUROPE

 

O: 29APR2023 19:48:34  37.9N   36.2E ML=4.0  EMSC   CENTRAL TURKEY                

P: 26APR2023 152660    38.0N   38.0E 3.5-5.1 BAAAA  Turkey                     

 

O: 29APR2023 22:21:55  38.3N    7.3W ML=3.0  EMSC   PORTUGAL                     

P: 28APR2023 152628    39.0N    8.0W 3.5-5.3 AAAAA  Morocco/Spain               

 

O: 29APR2023 18:02:57  38.4N   22.1E ML=4.3  EMSC   GREECE                       

P: 30APR2023 152602    39.0N   23.0E 3.0-4.6 AAAAA  Aegean Sea                 

 

O: 30APR2023 01:04:45  39.4N   54.8E mb=4.5  EMSC   TURKMENISTAN                 

P: 23APR2023 152676    40.0N   50.0E 4.0-5.8 CACAA  Kazakhstan                 

 

SOUTHWEST PACIFIC

 

O: 30APR2023 00:00:29  15.6S  175.6W mb=4.5  EMSC   TONGA                        

P: 29APR2023 152749    15.0S  176.0W 4.0-5.6 AAAAA  Samoa Islands               

 

O: 30APR2023 06:15:26  25.4S  178.6E mb=4.7  EMSC   SOUTH OF FIJI ISLANDS        

P: 26APR2023 152773    24.0S  179.0E 4.0-5.7 BBAAA  Tonga/Fiji                 

 

O: 29APR2023 07:35:54  21.8S  174.1E mb=4.5  EMSC   VANUATU REGION               

P: 26APR2023 152773    21.0S  174.0E 4.0-5.5 BAAAA  Tonga/Fiji                 

 

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

 

OCEAN RIDGES

 

O: 30APR2023 04:10:40   0.5N   25.0W mb=4.7  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 28APR2023 152535     1.0S   24.0W 4.0-5.6 ABAAA  Central Mid-Atlantic       

 

O: 29APR2023 14:07:03  13.2N   51.0E mb=4.7  EMSC   GULF OF ADEN                 

P: 29APR2023 152565    13.0N   51.0E 3.5-5.1 AAAAA  Gulf of Aden                

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 29APR2023 20:00:12  35.2S  180.0E ML=4.2  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 29APR2023 152780    38.0S  179.0E 3.0-4.4 ACAAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

O: 29APR2023 15:49:28  26.1N  128.5E mb=4.8  EMSC   RYUKYU ISLANDS, JAPAN        

P: 24APR2023 152596    28.0N  127.0E 4.0-5.4 BBBAA  Ryukyu Islands             

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 29APR2023 15:21:58  30.7N  114.3W ML=3.6  EMSC   GULF OF CALIFORNIA

O: 29APR2023 13:21:45  30.9N  115.2W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO

O: 29APR2023 07:22:54  30.2N  114.7W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO      

O: 30APR2023 07:05:26  30.9N  116.1W ML=3.5  EMSC   BAJA CALIFORNIA, MEXICO      

P: 22APR2023 152640    30.8N  115.8W 2.5-4.8 CAAAA  So. California             

 

O: 29APR2023 12:09:10  32.7N  115.6W ML=3.1  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 12:14:41  32.7N  115.5W Ml=2.1  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 29APR2023 12:26:03  32.7N  115.5W Ml=2.1  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 29APR2023 12:31:55  32.7N  115.5W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 12:49:44  32.7N  115.5W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 13:02:43  32.7N  115.6W ML=2.3  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 13:11:56  32.7N  115.5W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 13:19:47  32.7N  115.5W Ml=2.1  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 29APR2023 14:35:24  32.7N  115.5W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 14:48:54  32.7N  115.5W ML=2.8  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 29APR2023 15:05:11  32.7N  115.5W Ml=2.5  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 16:52:54  32.7N  115.5W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 17:53:11  32.7N  115.5W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 17:59:54  32.7N  115.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 17:59:54  32.7N  115.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 18:16:10  32.7N  115.6W ML=2.8  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 19:02:32  32.7N  115.6W ML=2.1  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 19:08:47  32.7N  115.5W ML=2.8  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 29APR2023 19:32:55  32.7N  115.6W ML=2.5  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 21:06:47  32.7N  115.6W ML=3.7  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 21:08:01  32.7N  115.6W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 21:14:10  32.7N  115.5W Ml=2.3  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 29APR2023 21:19:17  32.7N  115.5W Ml=2.1  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 29APR2023 21:36:18  32.7N  115.5W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 21:53:46  32.7N  115.5W Ml=2.3  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 29APR2023 22:41:49  32.7N  115.5W Ml=2.1  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 30APR2023 00:43:04  32.7N  115.5W Ml=2.3  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 30APR2023 04:39:53  32.7N  115.6W ML=2.7  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 04:41:51  32.7N  115.5W ML=2.1  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 04:45:39  32.7N  115.6W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 05:42:44  32.7N  115.5W Ml=2.1  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 30APR2023 06:39:56  32.7N  115.5W Ml=3.0  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 12:07:00  32.8N  115.6W Mw=4.1  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 22:27:09  32.8N  115.6W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 05:55:59  33.0N  116.0W ML=3.1  EMSC   SOUTHERN CALIFORNIA           

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 AAAAA  So. California             

 

O: 30APR2023 07:12:27  33.2N  115.6W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:19:16  33.2N  115.6W Ml=2.9  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:21:37  33.2N  115.6W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:22:40  33.2N  115.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:27:39  33.2N  115.6W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:30:12  33.2N  115.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:32:12  33.2N  115.6W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 30APR2023 07:09:34  33.2N  115.6W mb=4.5  EMSC   SOUTHERN CALIFORNIA          

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 AAAAA  So. California             

 

O: 29APR2023 21:23:33  33.4N  116.4W Ml=2.3  EMSC   SOUTHERN CALIFORNIA          

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 AAAAA  So. California             

 

O: 29APR2023 21:23:33  33.4N  116.4W Ml=2.3  EMSC   SOUTHERN CALIFORNIA          

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 AAAAA  So. California             

 

O: 30APR2023 00:12:13  35.7N  117.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P: 27APR2023 152650    35.9N  117.7W 2.5-4.4 BAAAA  So. California             

P: 30APR2023 152645    35.0N  117.7W 2.5-4.7 AAAAA  So. California             

 

O: 29APR2023 10:37:54  36.6N  121.2W Md=2.3  EMSC   CENTRAL CALIFORNIA

O: 29APR2023 22:22:48  36.5N  121.1W Md=2.0  EMSC   CENTRAL CALIFORNIA           

P: 27APR2023 152610    36.7N  121.4W 2.5-4.4 AAAAA  Central California         

 

O: 29APR2023 23:08:10  37.3N  115.0W ML=2.8  EMSC   NEVADA                       

P: 30APR2023 152606    37.8N  115.8W 2.5-4.8 AAAAA  California/Nevada area     

 

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

 

O: 29APR2023 09:44:45  37.4N  121.7W Md=2.5  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 26APR2023 152611    37.4N  121.8W 2.5-4.6 BAAAA  Central California         

P: 30APR2023 152611    37.2N  122.1W 2.5-4.6 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.5 in Central California was felt with intensity II-III in the area(s) of Central California in Los Gatos, San Ramon, Alameda, Oakland and Los  Banos.

 

O: 29APR2023 14:39:16  38.1N  118.8W Md=2.0  EMSC   CENTRAL CALIFORNIA           

P: 28APR2023 152607    38.2N  118.8W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 29APR2023 15:19:09  38.8N  122.8W Md=2.3  EMSC   NORTHERN CALIFORNIA          

P: 25APR2023 152613    38.8N  122.8W 2.5-4.4 BAAAA  Central California         

 

O: 29APR2023 13:15:36  39.6N  120.4W Md=2.2  EMSC   NORTHERN CALIFORNIA          

P: 29APR2023 152615    39.4N  120.5W 2.5-4.6 AAAAA  Central California         

 

O: 29APR2023 12:57:37  40.7N  122.5W Md=2.0  EMSC   NORTHERN CALIFORNIA          

P: 27APR2023 152690    40.7N  122.3W 2.5-4.6 AAAAA  Northern California        

 

O: 30APR2023 01:26:14  41.1N  125.2W ML=2.5  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 27APR2023 152692    40.6N  124.9W 2.5-4.5 BAAAA  Off Coast of No. Calif     

 

ALASKA

 

O: 30APR2023 04:48:14  51.6N  178.4E mb=3.9  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 27APR2023 152724    52.0N  179.0E 4.0-5.8 BAAAA  Rat Islands                

 

O: 29APR2023 13:34:08  54.7N  157.8W ML=3.5  EMSC   SOUTH OF ALASKA              

O: 29APR2023 08:12:49  56.9N  158.1W ML=3.1  EMSC   ALASKA PENINSULA             

P: 26APR2023 152727    54.6N  161.7W 3.5-5.3 BABAA  Unimak Islands, Aleutians  

 

O: 29APR2023 15:39:59  62.4N  149.1W ML=3.5  EMSC   CENTRAL ALASKA               

P: 27APR2023 152735    62.7N  151.6W 3.2-5.1 AAAAA  Central 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

 

O: 29APR2023 17:18:19  31.6N  104.0W ML=2.0  EMSC   WESTERN TEXAS

O: 29APR2023 14:03:10  31.7N  104.4W ML=2.6  EMSC   WESTERN TEXAS

O: 29APR2023 18:47:47  31.7N  104.5W ML=2.4  EMSC   WESTERN TEXAS                 

 

O: 30APR2023 05:20:20  34.4N  106.8W ML=3.1  EMSC   NEW MEXICO                   

P: 25APR2023 152617    36.9N  105.1W 2.0-4.3 BCBAA  Colorado area              

 

NEIC reported this earthquake of M 3.1 in New Mexico was felt with intensity II-III in the area(s) of New Mexico in La Joya, Bosque.

 

O: 29APR2023 13:59:02  37.2N  104.8W ML=2.6  EMSC   COLORADO                     

P: 25APR2023 152617    36.9N  105.1W 2.0-4.3 AAAAA  Colorado area              

 

O: 29APR2023 11:34:18  41.5N  106.8W ML=2.5  EMSC   WYOMING                      

P: 23APR2023 152669    40.6N  106.6W 2.0-4.1 CAAAA  Colorado area              

 

O: 29APR2023 18:12:58  44.5N  115.2W Ml=2.1  EMSC   SOUTHERN IDAHO               

P: 23APR2023 152681    44.5N  115.2W 2.0-3.9 CAAAA  Montana/Idaho              

 

 

EASTERN U.S./CANADA

 

O: 29APR2023 07:38:16  36.4N   89.5W Md=2.2  EMSC   TENNESSEE

O: 29APR2023 14:08:30  36.3N   89.5W Md=2.5  EMSC   TENNESSEE                    

P: 25APR2023 152629    36.0N   89.0W 2.0-3.9 BAAAA  New Madrid area            

 

O: 29APR2023 17:49:38  36.4N   97.7W ML=2.0  EMSC   OKLAHOMA                     

P: 28APR2023 152657    36.0N   97.0W 2.0-4.3 AAAAA  Southern Plains            

 

HAWAII

 

O: 30APR2023 04:34:07  19.2N  155.5W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 29APR2023 14:28:36  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29APR2023 22:50:22  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 29APR2023 09:36:13  19.2N  155.4W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII     

P: 26APR2023 152588    19.3N  155.1W 4.0-5.8 BAAAA  Hawaii area                

 

NEIC reported these earthquakes of M 3.0-3.3 in Hawaii were felt with intensity II-III in the area(s) of Hawaii in Naalehu and Captain Cook.

 

LAST GASP? STRONG ECLIPSE-RELATED EARTHQUAKES IN NEW GUINEA; SUMBAWA, INDONESIA

 

EARTHQUAKE SUMMARY FOR APRIL 28, 2023

 

 

 

Possibly the last clearly defined strong eclipse-related earthquakes along the path of the solar eclipse of April 20 occurred today. These included an M 6.0 in northern New Guinea and an M 5.7 in Sumbawa area south of this. A series of strong earthquakes apparently to the eclipse have occurred in the Molucca Sea and New Guinea and the South Indian Ocean in the week since that event.

BMG reported today's earthquake was felt with intensity III in Kei Besar, elatan, Timur, Kecil, Barat,  Tenggara, dan wilayah Sekitarnya among others. his is expected to relax now that available seismic energy has largely been released in this area in this series of strong earthquakes. Some resumption ay occur at the time of the full moon on May 5, 2023. The M 6.0 in northern New Guinea was followed by a strong series of moderate aftershocks including an M 5.5 and 5.1 and is still ongoing as of the writing of this report. The last earthquake reported with M>=6 by NEIC within about 200 km of this epicenter was an M 6.1 on February 17, 2023 and an M 6.0 on November 10, 2021 and prior to that an M 6.6 on October 12, 2012. the event in November, 2021, like today's was associated with a strong geomagnetic storm, not uncommon for stronger events near the geomagnetic equator. The strongest earthquake in this area in the past 25 years was an M 7.3 on February 7, 2004.  At the time of the event on November 10, 2021, this summary noted in this regard:

 

"An earthquake of M 6.0 also occurred near the geomagnetic equator today in  the region of Papua New Guinea in Indonesia. This continues a series of earthquake of this size in Indonesia which has accompanied the recent geomagnetic storm. BMG reported this event with M 6.1 was felt with light to moderate intensity throughout much of southwestern New Guinea. This is the strongest earthquake within about 200 km of this epicenter since an M 6.6 on October 12, 2012 more than nine years ago." (November 10, 2021)

 

Today’s event occurred within about 200 km of the path of total eclipse with the solar eclipse of April 20, like an event of M 4.9-5.7 in Sumbawa, Indonesia today. Forecast 152554 had expected this event to the north of this epicenter was likely in this area around April 24. This activity is at 145 degrees from the M 6.7 in Ecuador of March 18, 2023 and at 144 degrees from the M 6.8 in Argentina of January 20, 2023 and at the fifth node from the M 7.2 in Tajikistan of February 23, 2023 and at the seventh node (52 degrees) from the Kermadec Is. M 7.2 of April 24, 2023 and may have been promoted by energy from those sources.

 

O: 29APR2023 02:21:15   4.7S  134.0E ML=4.5  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 28APR2023 09:19:53   4.8S  133.9E Mw=5.7  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 28APR2023 13:58:27   4.8S  133.8E mb=4.3  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 28APR2023 17:38:53   4.8S  134.0E ML=4.4  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 28APR2023 18:12:52   4.8S  134.0E Mw=5.5  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 29APR2023 02:23:03   4.8S  133.9E mb=4.6  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 29APR2023 03:14:00   4.8S  133.9E ML=4.0  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 28APR2023 18:32:55   5.0S  133.6E mb=4.4  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 29APR2023 07:03:53   5.1S  153.5E mb=5.1  EMSC   NEW IRELAND REGION, P.N.G.

O: 28APR2023 09:19:56   4.6S  133.9E ML=6.0  BMG    Tual, New Guinea INDONESIA                          

O: 28APR2023 20:23:07   4.7S  133.8E ML=4.0  EMSC   NEAR S COAST OF PAPUA, INDONES

P: 24APR2023 152554     2.0S  134.0E 4.0-5.4 BCAAA  West Irian, PNG            

 

 

The M 4.9-5.7 (BMG) earthquake in Sumbawa occurred along the eclipse path within about 100 km of the path of total eclipse in an area in which  previous eclipse moderate activity had not been seen with this eclipse.  NEIC reported this earthquake of M 4.9 in Timor, Indonesia was felt with intensity II-III in the area(s) of Timor, Indonesia in Ruteng Nusa. The last event within about 200 km of this epicenter in Sumbawa, Indonesia with M>=5.7 recorded by NEIC was an M 6.5 on August 17, 2018 and prior to that an M 6.2 on December 29, 2016.  Forecast 152553 had expected today's event with magnitude up to M 5.6 was likely within about 100 km of this epicenter around April 26.

 

O: 28APR2023 20:38:32   8.8S  119.0E ML=5.7  BMG    Sumbawa, Indonesia

O: 28APR2023 20:38:31   8.8S  119.0E mb=4.9  EMSC   SUMBAWA REGION, INDONESIA    

P: 26APR2023 152553     8.0S  119.0E 4.0-5.6 AAAAA  Sumbawa Island area        

 

A moderate earthquake of M 5.0 was also felt in the Manila, Philippines area near Mindoro Island today.  NEIC reported this earthquake of M 5.2 in Mindoro, Philippines was felt with intensity IV in the area(s) of  Southern Tagalog at Sa Jose, Tagaytay; III in Inicbulan, Kaytitinga, Mendez, Binan, Mariveles, Angono, Manila and Caintla.  PHIVOLCS reported IV in Looc, Luband, Mamburao, Paluan, Rizal, Sablayan and San Jose, Occidental Mindor; City of Calapan, Puerto Galera and San Teodoro, Oriental Mindoro; Bauan, Mabini and Tingloy, Batangas

and III in City of Las Pinas, City of Manila, Balayan, Batangas City, City of Calaca, Calatagan, Lemery, City of Lipa, Lobo, and Taysan, Batangas; Alfonso, City of Cavite, Indang, Maragondon and City of Tgaytay, Cavite; Abra De Ilog and Santa Cruz, Occidental Mindoro; Naujan, Oriental Mindoro. Forecast 152568 had expected this event within about 50 km was likely around April 25, 2023.

 

O: 28APR2023 16:00:30  13.7N  120.7E mb=5.0  EMSC   MINDORO, PHILIPPINES         

P: 25APR2023 152568    14.0N  121.0E 3.5-5.1 BAAAA  Luzon, Philippines         

 

The possible imminent eruption of Nevada Del Ruiz Volcano in western Colombia prompted Colombian officials to call for immediate evacuations today. The last major eruption of this volcano in 1985 triggered a massive mud avalanche which destroyed a town of 50,000 and killed near half the population of that community. Nevada del Ruiz is located near the antipode of the M 7.2 in Nias, Indonesia of April 24, 2023 and volcanism at this time may be promoted by antipodal focusing of seismic energy from that source, making an eruption more likely in coming days. The most likely time of an eruption in the near future would be around May 5, 2023. The full moon will arrive on that date near local solar noon in Colombia. Tidal effects related to the full moon (and lunar eclipse) could help trigger volcanism at that time.

 

The strong series of events in the Baja-California border area near Calexico, California continued today unabated.  NEIC reported these earthquakes of M 3.2, 2.5, 2.5, 2.7 and 2.9 in Southern California were felt with intensity II-III in the area(s) of Southern California in Mexicali, Calexico (IV), Heber (IV), El Centro, Winterhaven, Progreso, Holtville  and Imperial and in Baja Californiat with IV at Puebla. Earthquake series in this region follow a pattern unlike those in most other areas. They often start out with a series of minor earthquakes, then a brief quiet period, a second period of larger events, another brief quiet period and a final period with moderate to large earthquake(s). This appears to be case in the current situation which may be controlled by moderate solar flares and the geomagnetic storm. Expect further enhanced seismicity in this region in the next several days. As the largest event in this series today was M 2.9, it appears to be a quiet period with more active conditions coming in the next day. Forecast 152642 had expected today's sequence was likely around April 30. This activity is at 102 degrees from the M 7.0 in New Guinea of April 2, 2023 and near 104 degrees from the major earthquakes in Turkey of February 6, 2023 and is likely to have been promoted by energy from that source.

 

O: 28APR2023 11:07:30  32.7N  115.5W Ml=2.4  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 28APR2023 14:43:24  32.7N  115.5W Ml=2.5  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 28APR2023 14:48:44  32.7N  115.5W ML=2.6  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 17:04:58  32.7N  115.5W Ml=2.2  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 28APR2023 18:25:25  32.7N  115.5W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 20:06:56  32.7N  115.5W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 20:24:58  32.7N  115.6W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 21:04:30  32.7N  115.5W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 23:14:34  32.7N  115.5W Ml=2.5  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 23:24:44  32.7N  115.5W Ml=2.2  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 28APR2023 23:26:47  32.7N  115.5W Ml=2.4  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 28APR2023 23:28:02  32.7N  115.5W Ml=2.9  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 29APR2023 00:02:52  32.7N  115.5W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 04:22:16  32.7N  115.5W Ml=2.3  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 28APR2023 08:39:50  33.2N  116.0W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 08:39:50  33.2N  116.0W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 08:12:00  32.7N  115.5W Ml=2.4  EMSC   MEXICALI-CALEXICO AREA, CALIF.

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 AAAAA  So. California             

 

 

 

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of the Nias, Indonesia April 24, 2023, where promoted seismicity is considered likely.

 

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

 

O: 29APR2023 00:08:16  50.0N   89.0E mb=4.1  EMSC   RUSSIA-MONGOLIA BORDER REGION

P: 30APR2023 152726    50.0N   88.0E 3.0-4.4 AAAAA  So. Siberia                

 

O: 28APR2023 15:46:15  56.1N  163.4E mb=4.3  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 24APR2023 152719    55.0N  163.0E 4.0-6.1 BAAAA  Komandorsky Isl            

 

INDONESIA AND PHILIPPINES

 

O: 28APR2023 14:36:35   2.0N  123.0E ML=4.0  EMSC   MINAHASA, SULAWESI, INDONESIA

P: 27APR2023 152527     1.0N  123.0E 4.0-5.4 AAAAA  Mindanao, Philippines      

 

O: 28APR2023 20:46:34   2.5N   96.6E mb=4.9  BMG    Sinabang, INDONESIA          

O: 28APR2023 20:46:30   2.5N   96.6E mb=4.9  EMSC   SIMEULUE, INDONESIA          

P: 26APR2023 152530     4.0N   96.0E 4.0-5.6 ABAAA  Nicobar Islands            

 

BMG reported this earthquake was felt with intensity III in Simeulue at Tupah, Timur, Teluk Dalam, Teupah, Tengah, Telukdalam, Asahan and Dalam and II ikn Seltatin at Bakongan, Kluet and dan Wilayah Sekitrarya, Indonesia.

 

O: 28APR2023 20:23:07   4.7S  133.8E ML=4.0  EMSC   NEAR S COAST OF PAPUA, INDONES

P: 24APR2023 152554     2.0S  134.0E 4.0-5.4 BCAAA  West Irian, PNG             

 

O: 28APR2023 13:35:44   5.3S  125.6E ML=4.1  EMSC   BANDA SEA                    

P: 30APR2023 152552     4.0S  123.0E 4.0-5.4 ABCAA  Sulawesi area              

 

O: 29APR2023 00:15:39   7.1S  129.8E mb=4.5  EMSC   KEPULAUAN BABAR, INDONESIA    

P: 30APR2023 152555     6.0S  130.0E 4.0-5.7 ABAAA  West Irian, PNG            

 

O: 28APR2023 20:07:00   8.2N   94.1E mb=4.9  EMSC   NICOBAR ISLANDS, INDIA REGION

P: 27APR2023 152556    10.0N   93.0E 4.0-5.4 ABAAA  Andaman Islands            

 

 

O: 29APR2023 02:21:15   4.7S  134.0E ML=4.5  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 28APR2023 09:19:53   4.8S  133.9E Mw=5.7  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 28APR2023 13:58:27   4.8S  133.8E mb=4.3  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 28APR2023 17:38:53   4.8S  134.0E ML=4.4  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 28APR2023 18:12:52   4.8S  134.0E Mw=5.5  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 29APR2023 02:23:03   4.8S  133.9E mb=4.6  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 29APR2023 03:14:00   4.8S  133.9E ML=4.0  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 28APR2023 18:32:55   5.0S  133.6E mb=4.4  EMSC   NEAR S COAST OF PAPUA, INDONESIA

O: 29APR2023 07:03:53   5.1S  153.5E mb=5.1  EMSC   NEW IRELAND REGION, P.N.G.

O: 28APR2023 09:19:56   4.6S  133.9E ML=6.0  BMG    Tual, New Guinea INDONESIA                         

O: 28APR2023 20:23:07   4.7S  133.8E ML=4.0  EMSC   NEAR S COAST OF PAPUA, INDONES

P: 24APR2023 152554     2.0S  134.0E 4.0-5.4 BCAAA  West Irian, PNG             

 

O: 28APR2023 20:38:32   8.8S  119.0E ML=5.7  BMG    Sumbawa, Indonesia

O: 28APR2023 20:38:31   8.8S  119.0E mb=4.9  EMSC   SUMBAWA REGION, INDONESIA    

P: 26APR2023 152553     8.0S  119.0E 4.0-5.6 AAAAA  Sumbawa Island area        

 

O: 28APR2023 16:00:30  13.7N  120.7E mb=5.0  EMSC   MINDORO, PHILIPPINES         

P: 25APR2023 152568    14.0N  121.0E 3.5-5.1 BAAAA  Luzon, Philippines         

 

CENTRAL AND SOUTH AMERICA

 

O: 28APR2023 11:20:28  12.7N   88.7W mb=4.2  EMSC   OFFSHORE EL SALVADOR          

P: 27APR2023 152561    14.0N   89.0W 3.5-5.1 ABAAA  Coast of Central America   

 

O: 28APR2023 08:39:37  13.9N   91.1W mb=4.4  EMSC   GUATEMALA                    

P: 29APR2023 152564    13.0N   91.0W 3.5-5.1 AAAAA  Guatemala                  

 

O: 28APR2023 12:49:40  15.4N   96.4W ML=4.2  EMSC   OFFSHORE OAXACA, MEXICO      

P: 30APR2023 152576    16.0N   97.0W 3.5-5.5 AAAAA  Oaxaca, Mexico             

 

O: 28APR2023 23:16:22  17.3N  101.6W ML=4.0  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 28APR2023 152570    18.0N  101.0W 3.5-5.3 AAAAA  Michoacan, Mexico          

 

O: 28APR2023 19:45:17  17.9N   98.5W ML=4.0  EMSC   GUERRERO, MEXICO             

P: 26APR2023 152577    18.0N  100.0W 3.5-5.5 AABAA  Oaxaca, Mexico             

 

O: 28APR2023 23:22:56  19.0N   67.1W Md=3.2  EMSC   PUERTO RICO REGION

O: 28APR2023 21:42:20  18.9N   67.7W Md=3.5  EMSC   PUERTO RICO REGION           

P: 25APR2023 152579    19.0N   68.0W 3.4-5.3 BAAAA  Puerto Rico                

 

O: 28APR2023 08:36:28  19.1N   69.1W ML=3.7  EMSC   DOMINICAN REPUBLIC REGION    

P: 29APR2023 152579    19.0N   69.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O: 28APR2023 14:47:38  21.1S   68.8W mb=4.6  EMSC   TARAPACA, CHILE              

P: 26APR2023 152763    22.0S   69.0W 4.0-5.9 AAAAA  Coast No. Chile            

 

AFRICA AND EUROPE

 

 

O: 29APR2023 01:55:48  38.0N   36.5E mb=4.5  EMSC   CENTRAL TURKEY               

P: 26APR2023 152660    38.0N   38.0E 3.5-5.1 BAAAA  Turkey                     

 

SOUTHWEST PACIFIC

 

O: 28APR2023 15:07:41  15.2S  167.5E mb=4.6  EMSC   VANUATU                      

P: 29APR2023 152759    15.0S  167.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

O: 28APR2023 10:37:19  20.9S  178.7W mb=4.2  EMSC   FIJI REGION                  

P: 22APR2023 152770    20.0S  179.0W 4.0-5.4 CAAAA  Tonga Islands              

 

O: 29APR2023 06:00:37  21.8S  177.3W mb=4.3  EMSC   FIJI REGION                  

P: 23APR2023 152770    20.0S  176.0W 4.0-5.6 BBAAA  Tonga Islands              

 

O: 28APR2023 19:35:27  23.3S  179.6W mb=4.5  EMSC   SOUTH OF FIJI ISLANDS        

P: 26APR2023 152771    24.0S  180.0W 4.0-5.5 AAAAA  Tonga Islands              

P: 28APR2023 152771    24.0S  178.0W 4.0-5.4 AABAA  Tonga Islands              

 

O: 28APR2023 07:02:30  25.4S  178.5E mb=4.8  EMSC   SOUTH OF FIJI ISLANDS        

O: 28APR2023 14:26:44  24.9S  179.0E mb=4.8  EMSC   SOUTH OF FIJI ISLANDS

P: 26APR2023 152773    24.0S  179.0E 4.0-5.7 AAAAA  Tonga/Fiji                 

 

 

OCEAN RIDGES

 

 

O: 29APR2023 04:55:58  52.6S  140.4E mb=5.1  EMSC   WEST OF MACQUARIE ISLAND     

 

O: 29APR2023 05:28:56  61.8S  161.5E Mw=5.1  EMSC   BALLENY ISLANDS REGION       

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 28APR2023 19:06:43  29.2S  178.1E mb=4.5  EMSC   KERMADEC ISLANDS REGION      

P: 25APR2023 152779    31.0S  178.0E 4.0-5.5 BBAAA  No. Kermadec Islands       

 

O: 29APR2023 04:55:58  52.6S  140.4E mb=5.1  EMSC   WEST OF MACQUARIE ISLAND     

 

O: 29APR2023 05:28:56  61.8S  161.5E Mw=5.1  EMSC   BALLENY ISLANDS REGION       

 

O: 28APR2023 09:30:27  33.5S  175.7E ML=4.0  EMSC   NORTH OF NEW ZEALAND         

P: 25APR2023 152779    31.0S  178.0E 4.0-5.5 BCBAA  No. Kermadec Islands       

 

O: 29APR2023 00:50:53  41.2S  174.5E ML=3.9  EMSC   COOK STRAIT, NEW ZEALAND     

O: 29APR2023 00:50:53  41.2S  174.5E MS=3.9  GEONET Cook Strait, New Zealand

P: 25APR2023 152785    40.0S  174.0E 3.0-4.5 BAAAA  North Island, N.Z.         

P: 27APR2023 152785    42.0S  173.0E 3.0-4.9 AAAAA  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. 865 reports of felt events were made of which 625 reported weak and 231 light intensity with 8 report of moderate shaking and 0 with strong and 0 severe and 1 with extreme intensity came from the area.

 

JAPAN AND KURIL ISLANDS

 

O: 29APR2023 03:31:23  26.0N  128.5E mb=4.6  EMSC   RYUKYU ISLANDS, JAPAN

O: 29APR2023 03:26:49  26.0N  128.6E mb=4.6  EMSC   RYUKYU ISLANDS, JAPAN         

P: 28APR2023 152596    27.0N  125.0E 4.0-5.6 AACAA  Ryukyu Islands             

 

NEIC reported this earthquake of M 4.6 in the Ryukyu Islands, Japan was felt with intensity II-III in the area(s) of the Ryukyu Islands, Japan in Yomitan, Okinawa.

 

O: 28APR2023 18:04:48  33.7N  140.6E mb=4.4  EMSC   IZU ISLANDS, JAPAN REGION    

P: 27APR2023 152635    33.0N  140.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

 

O: 28APR2023 07:45:56  42.0N  142.7E mb=4.3  EMSC   HOKKAIDO, JAPAN REGION       

P: 28APR2023 152672    41.0N  142.0E 3.5-5.4 AAAAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 28APR2023 11:07:30  32.7N  115.5W Ml=2.4  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 28APR2023 14:43:24  32.7N  115.5W Ml=2.5  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 28APR2023 14:48:44  32.7N  115.5W ML=2.6  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 17:04:58  32.7N  115.5W Ml=2.2  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 28APR2023 18:25:25  32.7N  115.5W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 20:06:56  32.7N  115.5W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 20:24:58  32.7N  115.6W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 21:04:30  32.7N  115.5W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 23:14:34  32.7N  115.5W Ml=2.5  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 23:24:44  32.7N  115.5W Ml=2.2  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 28APR2023 23:26:47  32.7N  115.5W Ml=2.4  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 28APR2023 23:28:02  32.7N  115.5W Ml=2.9  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 29APR2023 00:02:52  32.7N  115.5W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 29APR2023 04:22:16  32.7N  115.5W Ml=2.3  EMSC   MEXICALI-CALEXICO AREA, CALIF.

O: 28APR2023 08:39:50  33.2N  116.0W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 08:39:50  33.2N  116.0W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 08:12:00  32.7N  115.5W Ml=2.4  EMSC   MEXICALI-CALEXICO AREA, CALIF.

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 AAAAA  So. California             

 

O: 28APR2023 20:16:56  34.5N  119.4W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P: 28APR2023 152647    35.0N  119.2W 2.5-4.6 AAAAA  So. California             

 

O: 28APR2023 22:04:50  30.9N  116.1W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO

O: 28APR2023 22:07:07  30.9N  116.1W ML=3.5  EMSC   BAJA CALIFORNIA, MEXICO

O: 28APR2023 22:47:31  30.9N  116.2W ML=3.3  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 28APR2023 10:48:05  30.8N  116.2W ML=3.5  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 25APR2023 152640    31.5N  115.7W 2.5-4.9 BAAAA  So. California             

 

ALASKA

 

O: 28APR2023 14:25:09  56.2N  148.6W ML=3.1  EMSC   GULF OF ALASKA               

P: 25APR2023 152738    55.0N  149.0W 3.0-5.0 BBAAA  Northern Alaska            

 

O: 29APR2023 03:27:11  59.3N  145.0W ML=3.8  EMSC   GULF OF ALASKA               

P: 25APR2023 152732    60.1N  148.4W 3.2-5.2 BABAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 28APR2023 17:19:17  49.2N  120.9W Ml=3.4  EMSC   BRITISH COLUMBIA, CANADA     

O: 28APR2023 17:24:01  49.2N  120.9W Ml=2.2  EMSC   BRITISH COLUMBIA, CANADA

P: 28APR2023 152703    48.9N  122.1W 2.0-4.3 AAAAA  Washington state, U.S.     

 

NEIC reported this earthquake of M 3.4 in British Columbia, Canada was felt with intensity II-III in the area(s) of British Columbia, Canada in Princeton.

 

O: 28APR2023 10:59:06  56.1N  116.6W ML=3.7  EMSC   ALBERTA, CANADA              

 

ROCKY MOUNTAINS REGION

 

O: 28APR2023 12:23:37  30.9N  103.5W ML=2.2  EMSC   WESTERN TEXAS                

O: 28APR2023 11:57:02  31.6N  104.3W ML=2.6  EMSC   WESTERN TEXAS                

 

O: 28APR2023 20:03:47  37.4N  113.1W Ml=2.4  EMSC   UTAH                         

P: 30APR2023 152606    37.8N  115.8W 2.5-4.8 AACAA  California/Nevada area     

 

O: 28APR2023 18:53:11  44.8N  111.0W Ml=2.2  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 30APR2023 152705    44.2N  110.3W 2.0-4.3 AAAAA  Yellowstone/Wyoming        

 

O: 28APR2023 12:23:37  30.9N  103.5W ML=2.2  EMSC   WESTERN TEXAS                

O: 28APR2023 11:57:02  31.6N  104.3W ML=2.6  EMSC   WESTERN TEXAS                

O: 28APR2023 13:13:26  31.6N  104.1W ML=2.3  EMSC   WESTERN TEXAS

O: 28APR2023 14:50:09  31.6N  104.3W ML=2.2  EMSC   WESTERN TEXAS

O: 28APR2023 08:05:07  31.7N  104.3W ML=2.8  EMSC   WESTERN TEXAS

 

EASTERN U.S./CANADA

 

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

 

HAWAII

 

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

 

STRONG EARTHQUAKES SWARM AT DEEP FOCUS IN FIJI

 

EARTHQUAKE SUMMARY FOR APRIL 27, 2023

 

A series of strong earthquakes occurred today near 600 km depth under the southern Fiji Islands today. These included events of M 6.6, 6.0, 5.5, 5.5. They were not reported felt in this remote area and no tsunami was expected nor observed with these events. The M 6.6 is the strongest earthquake recorded within about 250 km of these epicenters since a similar series about 100 km from today's occurred on November 9, 2022 and included events of M 7.0, 6.7, 6.8, 6.6 and 6.5. Today's event may be a regional aftershock of those. An earthquake of M 6.7 also occurred on April 18, 2023 about 300 km northeast of today's epicenter in the Fiji Islands. Swarming of this type is not typical in the area, these being the only such series in the past 35 years. At the time of the swarm on November 9, 2022 this summary noted:

 

 

"Today's activity in Fiji was located at deep hypocentral Focus (600-650 km) and was felt lightly on the surface. Because of the deep depth, no tsunami was expected nor observed with today's events. The last earthquake with M>=7.0 within about 300 km of today's epicenters was an M 7.7  about 300 km to the north of today's epicenter on August 19, 2002. An M 7.8 occurred  east of this at an intermediate epicenter on December 9, 2007. This is about 300 km from today's epicenters." (November 9, 2022)

 

These may also be related to the eruption of Tonga-Tapu volcano in January, 2022.  That eruption triggered a mega-tsunami, the first such tsunami recorded  in modern history. That volcano is located about 500 km from today's epicenter but has had a major effect on regional seismicity since its eruption. Today's activity may be related to the current strong geomagnetic storm which has been ongoing for nearly a week. These epicenter lie near the geomagnetic equator. Stronger solar flares today may also had helped trigger this swarm by SFE.  Forecast 152773 had expected today's activity within about 150 km was likely in the Fiji Islands around April 26, 2023. These events may have been promoted by energy from the strong earthquakes in Turkey of February 6, 2023 as they are located 144-145 degrees from that source.

 

O: 28APR2023 04:57:25  24.9S  178.6E mb=4.5  EMSC   SOUTH OF FIJI ISLANDS

O: 28APR2023 03:51:06  25.1S  178.4E mb=5.5  EMSC   SOUTH OF FIJI ISLANDS

O: 28APR2023 03:13:44  25.2S  178.5E mb=6.0  EMSC   SOUTH OF FIJI ISLANDS

O: 28APR2023 03:51:06  25.1S  178.5E mb=5.5  ANSS   the Fiji Islands

O: 28APR2023 03:34:11  25.1S  178.4E mw=5.5  ANSS   the Fiji Islands

O: 28APR2023 03:13:44  25.2S  178.5E mb=6.0  ANSS   SOUTH OF FIJI ISLANDS

O: 28APR2023 03:13:51  25.3S  178.4E mb=6.6  ANSS   SOUTH OF FIJI ISLANDS

O: 28APR2023 03:34:11  25.2S  178.4E Mw=5.5  EMSC   SOUTH OF FIJI ISLANDS

O: 28APR2023 07:02:30  25.4S  178.5E mb=4.8  EMSC   SOUTH OF FIJI ISLANDS        

P: 26APR2023 152773    24.0S  179.0E 4.0-5.7 ABAAA  Tonga/Fiji                 

 

 

An M 5.7 earthquake also occurred in the South Sandwich Islands today. It was not felt in this remote region. The last earthquake within about 250 km of this epicenter with M>=5.7 was recorded by ANSS (NEIC) on November 2, 2022 (M 6.1). Forecast 152789 had expected today's epicenter would be active within about 50 km around April 23. This event occurred within about an hour of local solar midnight and may have been promoted by the high latitude geomagnetic storm today and/or by tidal stresses which maximize near this hour. It occurred at the peak of a C6.6 solar flare (#7740). This epicenter is located at 103 degrees from the M 7.2 in Nias, Indonesia and is likely promoted by energy from that source.

 

O: 28APR2023 01:07:52  60.0S   28.1W Mw=5.6  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 28APR2023 01:07:47  60.0S   27.9W mw=5.7  ANSS   South Sandwich Islands region"

P: 23APR2023 152789    60.0S   29.0W 4.0-6.0 BAAAA  So. Sandwich Islands       

 

 

In the U.S. and Canada the strongest activity of the past day has been occurring in Baja California and southern California. A series of events of M 3.5-4.0 continues offshore Baja with a lesser swarm near the California-Baja border near Calexico.  The series offshore Baja California is part of the aftershocks sequence following the M 6.2 on November 22, 2022 - a series which is quite persistent and shows little signs of dissipating. This M 6.2 was coincident with the swarm in Fiji at the time (see above).

 

Today's enhanced seismicity in Baja and Southern California may be related to the strong geomagnetic storm which is ongoing and has persisted for nearly a week.

 

Forecasts 152640 and 152642 had expected this activity in late April.

 

 

O: 27APR2023 16:05:39  30.8N  116.2W ML=3.6  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 27APR2023 09:26:43  30.9N  116.2W ML=3.7  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 27APR2023 10:16:07  30.9N  116.2W ML=3.9  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 27APR2023 10:36:25  30.9N  116.1W ML=3.6  EMSC   BAJA CALIFORNIA, MEXICO

O: 27APR2023 10:45:15  30.9N  116.1W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO

O: 27APR2023 20:12:25  30.9N  116.1W ML=3.6  EMSC   BAJA CALIFORNIA, MEXICO

O: 28APR2023 06:56:10  30.9N  116.3W ML=3.6  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 27APR2023 20:00:46  30.1N  114.7W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO      

O: 27APR2023 18:46:58  30.7N  116.3W ML=4.0  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 22APR2023 152640    30.8N  115.8W 2.5-4.8 BAAAA  So. California             

P: 25APR2023 152640    31.5N  115.7W 2.5-4.9 AAAAA  So. California             

 

NEIC reported the earthquake of M 3.1 in Southern California was felt with intensity IV in the area(s) of Southern California in  Calexico and Heber and II-III in El Centro, Mexicali, Holtville, Imperial and II in Baja California at Progreso, Puebla. NEIC reported the earthquake of M 3.2 in Southern California was felt with intensity II-III in the area(s) of Southern California in El Centro, Calexico, Heber, San Diego, La Jolla, Temecula and Los Angeles.

 

O: 28APR2023 06:49:52  32.7N  115.6W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 27APR2023 23:10:52  33.0N  116.0W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 27APR2023 12:14:23  33.2N  115.8W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 00:40:00  32.7N  115.5W Ml=2.4  EMSC   MEXICALI-CALEXICO AREA, CALIF.

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 AAAAA  So. California             

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of the Nias, Indonesia April 24, 2023, where promoted seismicity is considered likely.

 

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 27APR2023 08:15:20  23.5N  121.6E ML=4.1  TAI    Hualien, Taiwan              

P: 26APR2023 152599    23.0N  122.0E 4.0-5.4 AAAAA  Taiwan                     

 

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

 

 

O: 27APR2023 10:20:49  27.9N   55.4E mb=4.9  EMSC   SOUTHERN IRAN                

P: 28APR2023 152597    28.0N   55.0E 3.5-5.2 AAAAA  So. Iran/Persian Gulf      

 

NEIC reported this earthquake of M 4.9 in Iran was felt with intensity III-IV in the area(s) of Iran at Khorasan-e-Razavi at Meshed and Nayshabur and in Qom, Iran.

 

O: 28APR2023 03:40:30  29.7N   81.6E ML=4.1  EMSC   NEPAL

O: 27APR2023 18:13:53  29.8N   81.7E mb=4.5  EMSC   NEPAL

O: 27APR2023 19:45:53  29.7N   81.7E mb=5.2  EMSC   NEPAL                        

P: 23APR2023 152623    30.0N   79.0E 3.8-5.4 BABAA  India                      

 

NEIC reported this earthquake of M 5.2 in Nepal was felt with intensity II-III in the area(s) of Nepal in Jumla (VI) and Pokhara, Kaski. 

 

O: 27APR2023 22:39:02  36.0N   59.4E mb=4.9  EMSC   NORTHEASTERN IRAN            

P: 25APR2023 152632    37.0N   59.0E 3.8-5.2 AAAAA  No. Iran                   

 

O: 28APR2023 04:24:47  52.4N  159.5E mb=4.6  EMSC   OFF EAST COAST OF KAMCHATKA  

P: 29APR2023 152718    52.0N  159.0E 4.0-5.9 AAAAA  Kamchatka                  

 

INDONESIA AND PHILIPPINES

 

O: 27APR2023 14:56:54   3.2N   98.6E mb=4.6  EMSC   NORTHERN SUMATRA, INDONESIA  

P: 25APR2023 152531     2.0N   99.0E 4.0-5.6 ABAAA  So. Sumatera               

 

NEIC reported this earthquake of M 4.6 in Sumatra was felt with intensity II-III in the area(s) of Sumatrai in Kabanjahe (IV) and  Binjai.

 

O: 27APR2023 17:45:33   4.3S  143.2E mb=4.7  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P: 24APR2023 152545     7.0S  145.0E 4.0-5.5 BCBAA  New Ireland                

 

O: 28APR2023 04:38:38   4.7N  126.2E ML=4.3  EMSC   KEPULAUAN TALAUD, INDONESIA  

P: 18APR2023 152232     1.0N  120.0E 4.0-5.6 AAAAA  Celebes Sea                

 

O: 27APR2023 11:36:04   6.0N  126.3E ML=4.5  EMSC   MINDANAO, PHILIPPINES        

P: 24APR2023 152522     7.0N  126.0E 4.0-5.6 BAAAA  Central Philippines        

 

O: 27APR2023 21:55:34  11.7N  141.8E mb=4.5  EMSC   STATE OF YAP, MICRONESIA     

P: 27APR2023 152558    10.0N  138.0E 3.5-5.0 ABCAA  Caroline Islands           

 

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

 

CENTRAL AND SOUTH AMERICA

 

O: 27APR2023 17:21:25  12.4N   87.7W ML=4.1  EMSC   NEAR COAST OF NICARAGUA      

O: 28APR2023 00:55:58  13.2N   87.5W ML=4.0  EMSC   GOLFO DE FONSECA, HONDURAS   

P: 26APR2023 152573    13.0N   87.0W 3.5-5.3 AAAAA  Nicaragua                  

 

O: 27APR2023 12:48:45  16.8N   95.1W ML=4.0  EMSC   OAXACA, MEXICO               

P: 28APR2023 152560    16.0N   95.0W 3.5-5.2 AAAAA  Chiapas, Mexico            

 

O: 28APR2023 00:28:26  17.3S   70.3W mb=4.3  EMSC   SOUTHERN PERU                

P: 27APR2023 152752    17.0S   71.0W 4.0-5.7 AAAAA  So. Peru/Bolivia           

 

O: 27APR2023 07:43:29  17.4N   94.7W ML=4.0  EMSC   VERACRUZ, MEXICO             

P: 27APR2023 152560    17.0N   94.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O: 28APR2023 06:56:08  18.0N   66.8W Md=3.0  EMSC   PUERTO RICO

O: 27APR2023 19:25:24  19.1N   67.2W ML=3.6  EMSC   PUERTO RICO REGION           

P: 25APR2023 152579    19.0N   68.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O: 28APR2023 06:53:51  19.4N  108.5W mb=4.5  EMSC   REVILLA GIGEDO ISLANDS REGION

P: 26APR2023 152562    19.0N  109.0W 3.5-5.1 AAAAA  Coast of Jalisco, Mexico   

P: 28APR2023 152587    20.0N  109.0W 3.5-5.1 AAAAA  Gulf of California         

 

O: 28APR2023 02:02:42  20.0N   96.2W ML=4.1  EMSC   OFFSHORE VERACRUZ, MEXICO     

P: 27APR2023 152576    17.0N   96.0W 3.5-5.4 ACAAA  Oaxaca, Mexico             

 

AFRICA AND EUROPE

 

O: 27APR2023 23:53:50  33.6S   28.9E ML=3.0  EMSC   SOUTH AFRICA                 

P: 28APR2023 152766    27.0S   27.0E 3.0-4.6 ACBAA  Rep. South Africa          

 

O: 28APR2023 05:15:44  36.1N   36.1E mb=4.1  EMSC   TURKEY-SYRIA BORDER REGION   

O: 27APR2023 15:33:45  38.8N   37.2E mb=4.2  EMSC   CENTRAL TURKEY               

P: 26APR2023 152660    38.0N   38.0E 3.5-5.1 AAAAA  Turkey                      

 

O: 28APR2023 06:56:09  40.9N   48.3E mb=4.0  EMSC   AZERBAIJAN                   

P: 23APR2023 152676    40.0N   50.0E 4.0-5.8 BAAAA  Kazakhstan                 

 

SOUTHWEST PACIFIC

 

O: 28APR2023 04:57:25  24.9S  178.6E mb=4.5  EMSC   SOUTH OF FIJI ISLANDS

O: 28APR2023 03:51:06  25.1S  178.4E mb=5.5  EMSC   SOUTH OF FIJI ISLANDS

O: 28APR2023 03:13:44  25.2S  178.5E mb=6.0  EMSC   SOUTH OF FIJI ISLANDS

O: 28APR2023 03:51:06  25.1S  178.5E mb=5.5  ANSS   the Fiji Islands

O: 28APR2023 03:34:11  25.1S  178.4E mw=5.5  ANSS   the Fiji Islands

O: 28APR2023 03:13:44  25.2S  178.5E mb=6.0  ANSS   SOUTH OF FIJI ISLANDS

O: 28APR2023 03:13:51  25.3S  178.4E mb=6.6  ANSS   SOUTH OF FIJI ISLANDS

O: 28APR2023 03:34:11  25.2S  178.4E Mw=5.5  EMSC   SOUTH OF FIJI ISLANDS

O: 28APR2023 07:02:30  25.4S  178.5E mb=4.8  EMSC   SOUTH OF FIJI ISLANDS        

P: 26APR2023 152773    24.0S  179.0E 4.0-5.7 ABAAA  Tonga/Fiji                 

 

OCEAN RIDGES

 

O: 28APR2023 03:54:38  16.7S   67.4E mb=5.0  EMSC   MID-INDIAN RIDGE              

P: 23APR2023 152750    14.0S   66.0E 4.0-5.4 BCBAA  So. Indian Ocean           

 

O: 28APR2023 01:07:52  60.0S   28.1W Mw=5.6  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 28APR2023 01:07:47  60.0S   27.9W mw=5.7  ANSS   South Sandwich Islands region"

P: 23APR2023 152789    60.0S   29.0W 4.0-6.0 BAAAA  So. Sandwich Islands       

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 27APR2023 20:00:57  29.7S  177.3W mb=4.4  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 24APR2023 152765    28.0S  177.0W 4.0-5.7 BBAAA  No. Kermadec Islands       

P: 28APR2023 152765    28.0S  176.0W 4.0-5.7 ABAAA  No. Kermadec Islands       

 

O: 27APR2023 13:03:50  39.0S  174.9E mb=4.2  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 27APR2023 13:03:47  39.1S  174.8E mb=4.2  ANSS   Jerusalem New Zealand

P: 25APR2023 152785    40.0S  174.0E 3.0-4.5 AAAAA  North Island, N.Z.         

 

O: 27APR2023 23:13:24  40.3S  176.6E ML=3.3  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 28APR2023 03:18:21  40.3S  176.6E ML=4.0  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 28APR2023 03:53:41  40.3S  176.7E ML=3.1  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 27APR2023 11:24:02  40.3S  176.6E ML=3.2  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 21APR2023 152780    39.0S  178.0E 3.0-4.4 CBAAA  North Island, N.Z.         

 

O: 28APR2023 03:18:21  40.3S  176.6E ML=4.0  GEONET North Island, New Zealand

O: 27APR2023 10:57:38  40.5S  175.9E ML=3.4  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 25APR2023 152785    40.0S  174.0E 3.0-4.5 AABAA  North Island, N.Z.         

 

GEONET reported the M 4.0 was felt with moderate to strong intensity in the area southeast of Wellington, New Zealand and in southern North Island and northern South Island. 107 reports of felt events were made of which 73 reported weak and 32 light intensity with 1 reports of moderate shaking and 0 with strong and 0 severe and 1 with extreme intensity came from the area.

 

O: 28APR2023 03:54:35  43.2S  170.6E ML=3.6  EMSC   SOUTH ISLAND OF NEW ZEALAND  

P: 27APR2023 152785    42.0S  173.0E 3.0-4.9 ABBAA  So. Island, N.Z.            

 

O: 27APR2023 22:20:54  48.6S  164.8E ML=4.9  GEONET Snares Island, New Zealand.

O: 28APR2023 02:04:07  44.5S  169.7E ML=3.6  EMSC   SOUTH ISLAND OF NEW ZEALAND  

P: 23APR2023 152786    45.0S  168.0E 3.0-5.2 BABAA  So. Island, N.Z.           

P: 27APR2023 152786    45.0S  167.0E 3.0-5.1 AACAA  So. Island, N.Z.           

 

GEONET reported this earthquake of M 4.9 near Snares Island, New Zealand was felt by 4 with 3 reporting weak intensity and 1 light intensity.

 

JAPAN AND KURIL ISLANDS

 

O: 27APR2023 08:07:00  26.0N  128.5E mb=4.9  EMSC   RYUKYU ISLANDS, JAPAN

O: 27APR2023 07:43:38  26.1N  128.6E Mw=5.3  EMSC   RYUKYU ISLANDS, JAPAN

O: 27APR2023 22:08:54  26.4N  128.1E mb=4.5  EMSC   RYUKYU ISLANDS, JAPAN

O: 27APR2023 07:41:12  26.0N  128.5E mb=4.6  EMSC   RYUKYU ISLANDS, JAPAN        

P: 24APR2023 152596    28.0N  127.0E 4.0-5.4 BBBAA  Ryukyu Islands             

P: 28APR2023 152596    27.0N  125.0E 4.0-5.6 AACAA  Ryukyu Islands             

 

An M 5.3 earthquake in the Ryukyu Islands, Japan was felt today in the area of

Okinawa, Japan with intensity II-III in Okinawa at Haebaru, Ishikawa, Okinawa, Chatan and Urasoe.

NEIC reported an aftershock of M 4.5 in Okinawa, Ryukyu Islands, Japan was felt with intensity II-III in the area(s) of Okinawa, Ryukyu Islands, Japan  in Okinawa and Chatan.

 

O: 28APR2023 05:18:14  32.1N  140.9E mb=4.4  EMSC   IZU ISLANDS, JAPAN REGION    

P: 27APR2023 152635    33.0N  140.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

 

O: 27APR2023 13:43:06  37.1N  141.1E mb=4.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 26APR2023 152637    38.0N  142.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 27APR2023 16:05:39  30.8N  116.2W ML=3.6  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 27APR2023 09:26:43  30.9N  116.2W ML=3.7  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 27APR2023 10:16:07  30.9N  116.2W ML=3.9  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 27APR2023 10:36:25  30.9N  116.1W ML=3.6  EMSC   BAJA CALIFORNIA, MEXICO

O: 27APR2023 10:45:15  30.9N  116.1W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO

O: 27APR2023 20:12:25  30.9N  116.1W ML=3.6  EMSC   BAJA CALIFORNIA, MEXICO

O: 28APR2023 06:56:10  30.9N  116.3W ML=3.6  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 27APR2023 20:00:46  30.1N  114.7W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO      

O: 27APR2023 18:46:58  30.7N  116.3W ML=4.0  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 22APR2023 152640    30.8N  115.8W 2.5-4.8 BAAAA  So. California             

P: 25APR2023 152640    31.5N  115.7W 2.5-4.9 AAAAA  So. California             

 

O: 28APR2023 06:49:52  32.7N  115.6W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 27APR2023 23:10:52  33.0N  116.0W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 27APR2023 12:14:23  33.2N  115.8W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 28APR2023 00:40:00  32.7N  115.5W Ml=2.4  EMSC   MEXICALI-CALEXICO AREA, CALIF.

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 AAAAA  So. California             

 

O: 27APR2023 08:38:48  36.5N  121.1W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P: 24APR2023 152610    36.4N  121.0W 2.5-4.6 BAAAA  Central California         

P: 26APR2023 152609    36.6N  120.7W 2.5-4.5 AAAAA  Central California         

 

O: 28APR2023 06:33:11  37.2N  117.5W ML=2.9  EMSC   CENTRAL CALIFORNIA           

P: 27APR2023 152604    36.2N  117.9W 2.5-4.5 AAAAA  California/Nevada area     

 

O: 28APR2023 00:54:05  38.2N  118.0W ml=2.2  EMSC   NEVADA                       

P: 28APR2023 152607    38.2N  118.8W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 27APR2023 07:58:36  39.5N  119.1W ml=2.0  EMSC   NEVADA                       

P: 27APR2023 152667    40.2N  119.6W 2.5-4.7 AAAAA  California/Nevada area     

 

O: 27APR2023 18:21:25  40.8N  123.4W Md=2.2  EMSC   NORTHERN CALIFORNIA

O: 28APR2023 05:58:54  40.3N  123.6W Md=2.0  EMSC   NORTHERN CALIFORNIA          

P: 29APR2023 152614    39.8N  123.5W 2.5-4.9 AAAAA  Central California         

 

O: 27APR2023 12:38:35  40.6N  124.0W Md=2.0  EMSC   NORTHERN CALIFORNIA          

P: 27APR2023 152692    40.6N  124.9W 2.5-4.5 AAAAA  Off Coast of No. Calif     

 

ALASKA

 

O: 27APR2023 14:02:12  54.6N  156.8W mb=4.0  EMSC   SOUTH OF ALASKA              

P: 26APR2023 152727    54.6N  161.7W 3.5-5.3 AACAA  Unimak Islands, Aleutians  

 

O: 28APR2023 04:59:04  55.3N  159.7W ML=3.4  EMSC   ALASKA PENINSULA             

P: 26APR2023 152727    54.6N  161.7W 3.5-5.3 AABAA  Unimak Islands, Aleutians  

 

O: 27APR2023 11:32:41  55.7N  149.2W ml=3.0  EMSC   GULF OF ALASKA               

P: 25APR2023 152738    55.0N  149.0W 3.0-5.0 AAAAA  Northern Alaska            

 

O: 27APR2023 21:29:16  66.5N  157.3W ML=3.4  EMSC   NORTHERN ALASKA              

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 27APR2023 07:01:46  50.6N  129.6W ML=2.6  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 27APR2023 152712    50.9N  130.6W 3.0-5.3 AAAAA  British Colombia           

 

O: 28APR2023 05:56:59  64.4N  137.6W ml=3.4  EMSC   SOUTHERN YUKON TERRITORY, CANA

P: 26APR2023 152738    65.0N  139.0W 3.0-5.1 AAAAA  Northern Alaska            

 

ROCKY MOUNTAINS REGION

 

O: 28APR2023 00:08:06  31.6N  104.3W ML=2.2  EMSC   WESTERN TEXAS

O: 27APR2023 08:34:48  31.7N  104.4W ML=2.4  EMSC   WESTERN TEXAS

O: 27APR2023 10:37:58  31.7N  104.4W ML=2.4  EMSC   WESTERN TEXAS

O: 27APR2023 22:28:32  31.7N  104.3W ML=2.6  EMSC   WESTERN TEXAS

O: 28APR2023 03:41:18  31.7N  104.3W ML=3.2  EMSC   WESTERN TEXAS

O: 28APR2023 05:19:20  31.7N  104.4W ML=2.5  EMSC   WESTERN TEXAS

O: 27APR2023 11:15:53  31.6N  104.0W ML=2.0  EMSC   WESTERN TEXAS                

O: 27APR2023 21:55:45  32.9N  100.9W ML=2.6  EMSC   WESTERN TEXAS                

P: 26APR2023 152656    34.0N   97.0W 2.0-4.4 ABCAA  Southern Plains            

 

NEIC reported this earthquake of M 2.6 in Western Texas was felt with intensity II-III in the area(s) of Western Texas in Snyder.

 

O: 28APR2023 04:36:46  44.3N  115.2W Ml=2.5  EMSC   SOUTHERN IDAHO               

O: 27APR2023 09:00:42  44.3N  114.9W Ml=2.3  EMSC   SOUTHERN IDAHO

P: 23APR2023 152681    44.5N  115.2W 2.0-3.9 BAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 28APR2023 04:43:21  36.3N   89.5W Md=2.2  EMSC   TENNESSEE                    

O: 28APR2023 01:13:10  36.3N   89.5W md=1.6  ANSS   NNE of Ridgely Tennessee

O: 28APR2023 01:12:20  36.3N   89.5W md=1.8  ANSS   NNE of Ridgely Tennessee

P: 25APR2023 152629    36.0N   89.0W 2.0-3.9 BAAAA  New Madrid area            

 

O: 28APR2023 04:36:50  38.7N   84.8W Md=2.2  EMSC   EASTERN KENTUCKY             

P: 24APR2023 152624    37.2N   81.9W 2.0-3.9 BBBAA  Kentucky/Tennessee/NC      

 

HAWAII

 

 

O: 27APR2023 08:09:20  19.3N  155.1W ml=3.2  ANSS   Fern Forest Hawaii           

P: 26APR2023 152588    19.3N  155.1W 4.0-5.8 AAAAA  Hawaii area                

 

NEIC reported this earthquake of M 3.2 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Pahoa, Volcano, Mountain View, Kurtistown, Keaau, Hilo, Honokaa and Kapaau.

 

MODERATE QUAKES SHAKE HAWAII

 

EARTHQUAKE SUMMARY FOR APRIL 26, 2023

 

The strongest earthquake in the U.S. or Canada today was an M 4.2-4.5 in Hawaii. It was felt throughout most of the island of Hawaii with intensity IV in Hilo, Holualoa, Captain Cook, Kailua Kong and II-III in Kealakekua, Paauilo, Waikoloa, Kamuela, Hawaii National Park, Naalehu among others. A moderate aftershock of M 3.9-4.0 was also reported with similar intensities in Hawaii. An M 3.2 foreshock was reported felt with intensity II in Hawaii National Park. A strong excursion in the satellite geomagnetic field occurred at the time of the M 4.5 in Hawaii and may have helped trigger that event. The last earthquake of M>=4.5 in Hawaii occurred on February 15, 2023 and before that an M 5.0 on October 14, 2022. The largest earthquake in Hawaii in the past three years was an M 5.7 on October 10, 2021. At the time of the M 4.8 in Hawaii of February 15, 2023, this summary noted:

 

 

"The M 4.5-4.8 in Hawaii was felt throughout the big island. NEIC reported maximum intensity V in Naalehu with IV in Volcano, Captain Cook, Pahoa, Mountain View with III in Hawaii National Park, Hilo, Holualoa and Kurtistown among others. The mainshock was preceded by an M 3.7 which was felt with intensity III in Naalehu and Captain Cook. This is the strongest earthquake in Hawaii since an M 5.0 on October 14, 2022 and prior to that an M 5.7-6.2 south of Hawaii on October 10, 2021." (February 15, 2023)

 

Forecast 152588 had expected enhanced seismicity within about 25 km of this epicenter in Hawaii was likely around April 26. Hawaii is at 104-105 degrees from the M 7.2 in Nias, Indonesia of April 24, 2023 and was probably promoted by energy from that source.

 

O: 26APR2023 13:27:05  19.5N  155.5W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 27APR2023 05:27:40  19.5N  155.8W ML=4.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 27APR2023 02:30:54  19.2N  155.4W ML=4.5  EMSC   ISLAND OF HAWAII, HAWAII     

P: 26APR2023 152588    19.3N  155.1W 4.0-5.8 AAAAA  Hawaii area                

 

Elsewhere in the world, seismicity was at relatively quiet levels. Earthquakes of M>=5 were widely felt in Maule, Central Chile (M 5.0) and in the Dodecanese Islands,  Greece. Unfelt earthquakes of M 5.0-5.1 occurred in the Kuril Islands and in the South Sandwich Islands and as an aftershock in the Nias, Indonesia area. Like the event in Hawaii, the earthquake in the South Sandwich Islands is near 103 degrees from the Nias quake of April 24 and may have been promoted  by energy from that source.

 

O: 27APR2023 01:55:29  58.4S   23.9W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 29APR2023 152789    57.0S   25.0W 4.0-5.8 ABAAA  So. Sandwich Islands       

 

O: 26APR2023 15:41:44  45.8N  151.6E mb=5.0  EMSC   KURIL ISLANDS                

P: 29APR2023 152683    46.0N  155.0E 3.5-5.4 BABAA  NE Pacific                 

 

O: 26APR2023 20:43:00   0.7S   98.6E mb=5.1  EMSC   KEPULAUAN BATU, INDONESIA    

P: 28APR2023 152550     2.0S   99.0E 4.0-5.7 ABAAA  So. of Sumatera            

 

NEIC reported the earthquake of M 5.0 in Central Chile was felt with intensity II-III in the area(s) of Central Chile with maximum intensity IV in Maule at Linares, Talca and in Coihueco, BioBio and II-III in Curico, Maule, Concepcion, Biobio, Penaflor and Santiago and in Valparaiso at Quilpue Villa Alemana and Valparaiso. GUC reported this earthquake was felt with intensity  IV in  O'Higgins at Paredones, San Fernando, Cjepca, Chimbarong, Pearalillo, Santa Cruz, III in San Vicente de Tagua; in Maule with V in Talca, Pencahue, IV in Cauquenes, Curico, Teno, Linares, Villa Alegre, Pelarco, Pelluhue, III in Hualane, Iloca, Llico, Romeral, Constitucion; in Biobio with III in Chiguayante, Concepcion and in Nuble with V in Chillan, IV in Quiihue, Yungay, Trehuaco, San Cicolas and III in Ranquil and San Carlos, Chile. The last earthquake of M>=5 in the Maule region of Central Chile was an M 5.0 on November 23, 2022 but the last

of larger magnitude was an M 5.5 on October 28, 2020. Forecast 152776 had expected enhanced seismicity to the north of this event in central Chile was likely around April 25.

 

O: 27APR2023 06:07:14  35.6S   71.5W Mw=5.0  EMSC   MAULE, CHILE                 

O: 27APR2023 06:07     35.6S   71.5W mb=5.0  GUC    O'Higgins at Paredones, San Fe

P: 25APR2023 152776    33.0S   73.0W 4.0-5.8 ACBAA  Central Chile              

 

 

NEIC reported the earthquake of M 5.1 in the Dodecanese Islands, Greece was felt with intensity II-III in the area(s) of the Dodecanese Islands, Greece in Kalimnos; in Iraklion, Greece in Limin, Aghios Nikolaos,Kato Gouvai, Khanion tou Kokkini, Nea Alikarmassos and Kastellion and in Mugla,Turkey at Bodrum.

The last earthquake in the Dodecanese of larger magnitude than M 5.1 was an M 5.5 about 150 km north of this epicenter on August 31, 2022. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 5.5 in the Dodecanese Islands, Greece. NEIC reported it was felt with maximum intensity V in Samos, Greece in Neon Karlovasion; IV in Khora, Pithagorio, and Soke, Turkey and III in Kusadasi, Aydin, Turkey and Skala. Greece. An M 4.7 foreshock was felt with similar intensities in this area of Greece and the Dodecanese Islands. The M 5.5 occurred within a couple of minutes of local solar noon and was probably promoted by high tidal stresses which maximize near this hour. This is the strongest earthquake in the Dodecanese Islands within about 200 km of this epicenter since an M 7.0 on October 30, 2020." (August 31, 2023)

 

Forecast 152601 had expected today's event was likely within about 50 km around

April 29.

 

O: 26APR2023 20:00:35  36.3N   26.4E Mw=5.1  EMSC   DODECANESE ISLANDS, GREECE   

P: 29APR2023 152601    36.0N   27.0E 3.0-4.8 BAAAA  Aegean Sea                 

 

 

 

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of the Nias, Indonesia April 24, 2023, where promoted seismicity is considered likely.

 

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 27APR2023 06:21:18  29.6N  104.7E mb=4.4  EMSC   EASTERN SICHUAN, CHINA       

P: 22APR2023 152593    28.0N  104.0E 4.0-5.4 BBAAA  Myanmar                    

 

O: 26APR2023 07:53:38  42.3N   83.2E mb=4.3  EMSC   NORTHERN XINJIANG, CHINA     

P: 25APR2023 152677    42.0N   82.0E 4.0-5.5 AAAAA  Kirgizstan/Xinjiang        

 

O: 26APR2023 20:51:39  52.5N  159.2E mb=4.4  EMSC   OFF EAST COAST OF KAMCHATKA  

P: 29APR2023 152718    52.0N  159.0E 4.0-5.9 BAAAA  Kamchatka                  

 

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

 

INDONESIA AND PHILIPPINES

 

O: 26APR2023 20:43:00   0.7S   98.6E mb=5.1  EMSC   KEPULAUAN BATU, INDONESIA    

P: 28APR2023 152550     2.0S   99.0E 4.0-5.7 ABAAA  So. of Sumatera            

 

O: 26APR2023 06:49:47   0.9S  123.8E ML=4.3  EMSC   SULAWESI, INDONESIA          

P: 26APR2023 152552     1.0S  123.0E 4.0-5.4 AAAAA  Sulawesi area              

 

O: 26APR2023 07:48:23   4.2S  143.4E ML=4.6  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P: 17APR2023 152264     5.0S  144.0E 4.0-5.4 CAAAA  Papua New Guinea           

P: 24APR2023 152545     7.0S  145.0E 4.0-5.5 ACBAA  New Ireland                

 

O: 26APR2023 15:02:16   6.2S  129.8E ML=4.0  EMSC   BANDA SEA                    

P: 24APR2023 152555     7.0S  130.0E 4.0-5.7 AAAAA  West Irian, PNG            

 

O: 27APR2023 03:51:28   8.7S  118.4E mb=4.6  EMSC   SUMBAWA REGION, INDONESIA    

P: 26APR2023 152553     8.0S  119.0E 4.0-5.6 AAAAA  Sumbawa Island area        

 

 

CENTRAL AND SOUTH AMERICA

 

O: 27APR2023 01:43:37  15.8N   95.0W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

O: 27APR2023 04:35:00  16.7N   94.1W ML=4.1  EMSC   OAXACA, MEXICO               

P: 28APR2023 152560    16.0N   95.0W 3.5-5.2 AAAAA  Chiapas, Mexico            

 

O: 26APR2023 12:32:53  18.5N   67.9W Md=3.4  EMSC   DOMINICAN REPUBLIC REGION    

P: 25APR2023 152579    19.0N   68.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O: 27APR2023 05:40:27  19.0N   65.4W Md=3.2  EMSC   PUERTO RICO REGION           

P: 27APR2023 152566    19.0N   65.0W 3.0-5.2 AAAAA  Leeward Islands            

 

O: 27APR2023 06:07:14  35.6S   71.5W Mw=5.0  EMSC   MAULE, CHILE                 

P: 25APR2023 152776    33.0S   73.0W 4.0-5.8 ACBAA  Central Chile              

 

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

 

AFRICA AND EUROPE

 

O: 27APR2023 03:23:55  26.4S   27.4E ML=3.1  EMSC   SOUTH AFRICA                 

P: 28APR2023 152766    27.0S   27.0E 3.0-4.6 AAAAA  Rep. South Africa          

 

O: 26APR2023 20:00:35  36.3N   26.4E Mw=5.1  EMSC   DODECANESE ISLANDS, GREECE   

P: 29APR2023 152601    36.0N   27.0E 3.0-4.8 BAAAA  Aegean Sea                 

 

O: 26APR2023 08:14:02  38.2N   38.4E ML=4.0  EMSC   EASTERN TURKEY

O: 26APR2023 15:31:05  38.0N   36.4E mb=4.3  EMSC   CENTRAL TURKEY                

P: 24APR2023 152660    38.0N   36.0E 3.5-5.1 AAAAA  Turkey                     

P: 26APR2023 152660    38.0N   38.0E 3.5-5.1 AAAAA  Turkey                     

 

SOUTHWEST PACIFIC

 

O: 26APR2023 12:06:25  15.5S  167.5E mb=4.6  EMSC   VANUATU

O: 26APR2023 10:54:23  14.9S  166.7E mb=4.8  EMSC   VANUATU                      

P: 29APR2023 152759    15.0S  167.0E 4.0-5.4 BAAAA  Vanuatu Islands            

 

OCEAN RIDGES

 

O: 27APR2023 01:55:29  58.4S   23.9W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 29APR2023 152789    57.0S   25.0W 4.0-5.8 ABAAA  So. Sandwich Islands       

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 26APR2023 08:54:29  40.3S  176.6E ML=4.0  EMSC   NORTH ISLAND OF NEW ZEALAND  

P: 25APR2023 152785    40.0S  174.0E 3.0-4.5 AABAA  North Island, N.Z.         

 

O: 26APR2023 23:22:06  44.5S  169.7E ML=4.2  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 26APR2023 23:22:06  44.5S  169.7E MS=4.2  GEONET South Island, New Zealand

P: 23APR2023 152786    45.0S  168.0E 3.0-5.2 AABAA  So. Island, N.Z.           

P: 27APR2023 152786    45.0S  167.0E 3.0-5.1 AABAA  So. Island, N.Z.           

 

GEONET reported this earthquake was felt with weak intensity in the area southwest of Te Anau, South Island. 84 reports of felt intensity came from the area east and north of the epicenter with 59 weak, 20 light, 3 moderate, 0 strong, 0 severe and 2 extreme shaking.

 

 

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: 26APR2023 22:27:45  44.4N  148.2E mb=4.2  EMSC   KURIL ISLANDS                

P: 21APR2023 152673    43.0N  148.0E 3.5-5.4 BBAAA  Hokkaido, Japan            

 

O: 26APR2023 15:41:44  45.8N  151.6E mb=5.0  EMSC   KURIL ISLANDS                 

P: 29APR2023 152683    46.0N  155.0E 3.5-5.4 BABAA  NE Pacific                 

 

O: 26APR2023 18:56:05  49.3N  155.8E mb=4.6  EMSC   KURIL ISLANDS                

P: 26APR2023 152683    49.0N  155.0E 3.5-5.5 AAAAA  NE Pacific                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 26APR2023 07:34:32  37.3N  121.6W ML=2.9  EMSC   NORTHERN CALIFORNIA

O: 27APR2023 04:12:23  37.6N  121.9W Md=2.2  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 26APR2023 152612    37.8N  122.6W 2.5-4.4 AAAAA  Central California         

 

O: 26APR2023 08:40:25  30.9N  116.3W ML=3.4  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

O: 26APR2023 10:14:13  30.9N  116.1W ML=3.6  EMSC   BAJA CALIFORNIA, MEXICO

O: 26APR2023 22:33:24  30.6N  116.2W ML=3.5  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 22APR2023 152640    30.8N  115.8W 2.5-4.8 BAAAA  So. California             

 

O: 26APR2023 22:24:47  31.4N  115.4W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO      

O: 26APR2023 08:44:58  31.3N  115.2W ML=3.1  EMSC   BAJA CALIFORNIA, MEXICO

O: 26APR2023 10:38:49  31.3N  115.3W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO

O: 26APR2023 15:50:18  31.3N  115.3W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO

O: 26APR2023 09:42:47  31.4N  115.3W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO

O: 26APR2023 20:49:54  31.4N  115.4W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO

P: 25APR2023 152640    31.5N  115.7W 2.5-4.9 AAAAA  So. California             

 

O: 26APR2023 08:36:08  33.2N  115.6W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 26APR2023 09:18:27  33.2N  115.6W Ml=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 30APR2023 152642    32.9N  115.6W 2.5-4.9 BAAAA  So. California             

 

O: 26APR2023 12:01:37  37.0N  121.5W Md=2.2  EMSC   NORTHERN CALIFORNIA          

P: 27APR2023 152610    36.7N  121.4W 2.5-4.4 AAAAA  Central California         

 

O: 26APR2023 09:58:45  39.9N  123.6W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P: 27APR2023 152689    40.0N  123.0W 2.5-4.8 AAAAA  Northern California        

 

ALASKA

 

O: 26APR2023 17:05:01  52.3N  170.5W ML=3.0  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 29APR2023 152711    52.1N  171.3W 3.5-4.9 BAAAA  Andreanoff Isls, Aleutians 

P: 29APR2023 152716    52.4N  169.4W 3.5-5.2 BAAAA  Fox Islands, Aleutians     

 

O: 26APR2023 09:26:10  64.7N  152.5W ML=3.7  EMSC   CENTRAL ALASKA                

P: 25APR2023 152735    63.2N  151.4W 3.2-5.1 AABAA  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: 26APR2023 21:10:34  44.7N  114.4W Ml=2.1  EMSC   SOUTHERN IDAHO

O: 26APR2023 20:02:30  44.7N  114.4W ML=3.2  EMSC   SOUTHERN IDAHO               

P: 24APR2023 152681    44.5N  112.6W 2.0-4.1 AABAA  Montana/Idaho              

 

NEIC reported this earthquake of M 3.5 in Challis, Idaho was felt with intensity II-III in the area(s) of Challis, Idaho.

 

O: 26APR2023 14:27:42  31.6N  104.4W ML=3.0  EMSC   WESTERN TEXAS

O: 26APR2023 07:27:15  31.7N  104.4W ML=3.2  EMSC   WESTERN TEXAS

O: 26APR2023 07:29:02  31.7N  104.4W ML=2.1  EMSC   WESTERN TEXAS

O: 26APR2023 07:29:02  31.7N  104.4W ML=2.1  EMSC   WESTERN TEXAS

O: 26APR2023 07:34:00  31.7N  104.4W ML=2.5  EMSC   WESTERN TEXAS

O: 26APR2023 07:34:00  31.7N  104.4W ML=2.5  EMSC   WESTERN TEXAS

O: 27APR2023 02:40:40  31.7N  104.4W ML=2.6  EMSC   WESTERN TEXAS

O: 26APR2023 13:08:23  31.6N  104.0W ML=2.3  EMSC   WESTERN TEXAS                

P: 17APR2023 152357    31.7N  104.3W 2.0-4.1 CAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 26APR2023 17:58:06  46.5N   78.7W MB=2.0  ECAN of Mattawa, ON                 

P: 23APR2023 152686    46.0N   75.0W 2.0-4.6 BABAA  New York State             

 

O: 26APR2023 16:44:25  48.6N   71.8W MB=1.7  ECAN of Alma, QC                    

P: 27APR2023 152685    47.0N   70.5W 2.0-4.4 ABAAA  New England                

 

O: 26APR2023 09:29:08  48.7N   71.9W MB=2.1  ECAN of L'Ascension-de-Notre-Seigneur

P: 26APR2023 152679    49.3N   67.5W 2.0-4.4 AACAA  Maine                      

 

O: 26APR2023 05:59:07  47.1N   76.1W MB=1.8  ECAN of Grand-Remous, QC            

P: 19APR2023 152408    47.0N   76.0W 2.0-4.2 CAAAA  New York State             

 

HAWAII

 

O: 26APR2023 13:27:05  19.5N  155.5W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 27APR2023 05:27:40  19.5N  155.8W ML=4.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 27APR2023 02:30:54  19.2N  155.4W ML=4.5  EMSC   ISLAND OF HAWAII, HAWAII     

P: 26APR2023 152588    19.3N  155.1W 4.0-5.8 AAAAA  Hawaii area                

 

MODERATELY STRONG QUAKES SHAKE NORTH ISLAND, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR APRIL 25, 2023

 

A moderately large earthquake of M 5.9 shook areas of North Island, New Zealand and was followed by an M 5.3 aftershock today. NEIC reported this earthquake was felt with maximum intensity V in Palmerston North, and IV in Waipukurau and Napier Hawke's Bay. Lesser intensity shaking was reported in Dannevirke Manawatu-Wanganui, Levin and in the Wellington region at Masterton, Kapiti, Upper Hutt and Lower Hutt and in Taupo. The aftershock of M 5.2 was reported with intensity IV in Manawatu-Wanganui at Pahiatua, Palmerston North and Taihape and in Napier, Hawke's Bay. A number of light to moderate aftershocks followed the mainshock in the next seven hours and were often felt in the area of Porangahau, North Island.

 

A foreshock hit this area with the beginning of the geomagnetic storm on April 23. At the time this summary noted this as:

 

 

"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. 202 reports of felt events were made of which 123 reported weak and 72 light intensity with 6 reports of moderate shaking and 1 with strong and 0 severe and 0 with extreme intensity came from the area.

It was probably triggered by geomagnetic changes near 19:00 UT with the strong geomagnetic storm today." (April 23, 2023) 

 

A GRB (#230423A) occurred on April 23, 2023. It was first observed by Swift  at 19:07:55 UT on April 23 but has not yet been given a magnitude. This is precisely the time of maximum diversion of the geomagnetic field of April 23 as noted in previous issues of this summary. It also coincides with the time of the M 3.9-4.0 foreshock north of Wellington, North Island New Zealand and may have helped promote that event which led to the stronger activity in that area today. Other activity at this time included an M 3.4 and 3.5 in the Gulf of California and a series in the San Francisco Bay area minutes later included a number of minor earthquakes of M 2.0-3.0. The possible effects from this GRB, however are not distinguishable from those associated with the geomagnetic storm which occurred at the same time as noted in this summary at the time in association with the foreshock in North Island, New Zealand. The simultaneity of this GRB with the major geomagnetic storm - both at about 19:07 UT is probably a coincidence but the geomagnetic storm was much more powerful than expected. The combination of the effects of the CME and the GRB may have had unexpected consequences on the earth's geomagnetic field at satellite altitudes. GRB and CME are independent and random sources as GRB are commonly associated with Supernova at billions of light years distance and require energies not compatible with conditions on the sun. If the simultaneity of these two events is not random coincidence it may require rethinking about the origins of some GRB or their effects on the earth. The inclusion of this GRB in the Swift GRB Catalog was delayed until today, perhaps because of interference from the beginning of the geomagnetic storm at the same time.

 

 

The brightest GRB recorded was #221009A on October 9, 2022 at 14:10:17 starting observation time - about 70 times brighter than any other GRB every seen. The UVOT magnitude for this GRB was given in the Swift  catalog as 15.55. A sudden Ionospheric Disturbance (SID) helped in the detection of this GRB. This GRB was associated with an M 6.2 in the mid-Atlantic at the height of the output  and an M 5.2 in South Island, New Zealand. An M 4.1 in Sumatra followed less than an hour after the initial observation of this GRB.

 

 

 

A regional foreshock of M 4.0 also occurred earlier in the day near Hastings, North Island.

 

O: 25APR2023 09:46:16  39.9S  176.9E MS=4.0  NORTH ISLAND NEW ZEALAND

 

GEONET Felt with moderate to strong intensity in the area southeast of Wellington, New Zealand and in southern North Island and northern South Island. 1247 reports of felt events were made of which 794 reported weak and 427 light intensity with 22 reports of moderate shaking and 4 with strong and 0 severe and 0 with extreme intensity came from the area.

 

This earthquake occurred  as the  solar flare with the strongest flux of the day (#7300) was first observed and may have been promoted by SFE from that flare.

 

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

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

 

7300       0946   1005      1015   C1.2      (April 25, 2023)   1.9E-03      

 

GEONET reported the M 5.9 was felt with moderate to strong intensity in the area southeast of Wellington, New Zealand and in southern North Island and northern South Island. 22188 reports of felt events were made of which 7778 reported weak and 8758 light intensity with 4609 reports of moderate shaking and 936 with strong and 79 severe and 29 with extreme intensity came from the area.  GEONET the quake of M 5.5 was felt with moderate to strong intensity in the area southeast of Wellington, New Zealand and in southern North Island and northern South Island. 20836 reports of felt events were made of which 7220 reported weak and 8381 light intensity with 4284 reports of moderate shaking and 846 with strong and 76 severe and 29 with extreme intensity came from the area.  The last earthquake of equal or larger magnitude within about 150 km of this epicenter was an M 5.9 on November 22, 2015. An M 6.2 also hit the area on January 20, 2014. Forecasts 152780 and 152785 had expected this activity was likely around April 21-25, 2023. This activity is located at 144-146 degrees from the major earthquakes in Turkey of February 6, 2023 and at the third node (120 degrees) from the M 7.2 in Tajikistan of February 23, 2023 and at the seventh node (52 degrees) from the M 7.6 in the Banda Sea of January 9, 2023 and was probably promoted by energy from those sources.

 

O: 25APR2023 09:46:16  39.9S  176.9E MS=4.0  GEONET North Islands, New Zealand

O: 25APR2023 22:21:42  40.3S  176.5E ML=3.9  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 25APR2023 22:28:11  40.3S  176.6E ML=4.3  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 26APR2023 01:12:24  40.3S  176.6E ML=4.3  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 26APR2023 06:01:56  40.3S  176.5E ML=4.2  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 25APR2023 22:16:13  40.4S  176.7E Mw=5.4  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 25APR2023 22:19:03  40.3S  176.6E mb=5.2  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 25APR2023 22:16:13  40.3S  176.7E MS=5.9  GEONET North Island, N.Z.

O: 25APR2023 22:19:02  40.3S  176.7E ML=5.5  GEONET North Island, N.Z.

P: 21APR2023 152780    39.0S  178.0E 3.0-4.4 BBAAA  North Island, N.Z.         

P: 25APR2023 152785    40.0S  174.0E 3.0-4.5 AABAA  North Island, N.Z.         

 

An M 5.7 also occurred today in the South Indian Ocean. It was not reported felt in this remote area. The last earthquake within about 300 km of this epicenter with M>=5.7 was an M 5.9 on October 2, 2021 and prior to that an M 5.9 on March 30, 2019 and July 26, 2011. The largest earthquake in this area in the past 35 years was an M 6.1 on March 22, 1998. Forecast 152750 had expected areal seismic enhancement south of this was likely around April 23.

 

O: 26APR2023 00:14:01   9.1S   67.2E Mw=5.7  EMSC   MID-INDIAN RIDGE              

P: 23APR2023 152750    14.0S   66.0E 4.0-5.4 BCAAA  So. Indian Ocean           

 

 

An earthquake of M 2.9-3.3 in New Hampshire today continued the enhanced seismicity of Quebec and the northeastern U.S. NEIC reported it was felt with maximum intensity IV in New Hampshire at Center Sandwich, with II-III in Center Harbor, Moultonborough, Campton, Holderness, Ashland, North Sandwich, South Tamworth, Meredith, and Tamworth. It was also reported felt lightly in Maine, Massachusetts, and New York States. This is the strongest earthquake in New Hampshire since an M 2.9 on February 2, 2022. At the time of the M 2.9 on February 4, 2022 this summary noted:

 

An unusual earthquake of M 2.9 occurred in eastern New Hampshire today. NEIC reported it was felt with maximum intensity IV in Gorham and II-III in Randolph, Berlin, Jefferson, Jackson, Intervale, Bethl and Bartlett, New Hampshire and in Maine at Stoneham and Lovell. This earthquake occurred as a strong winter nor'easter passed through the area and may have been promoted by stresses associated with that storm. This earthquake occurred within about an hour of local solar midnight and may have been promoted by high tidal stresses. The last earthquake in New Hampshire or equal or larger magnitude within about 100 km of this epicenter occurred on February 7, 2013 with M 3.1 about 100 km to the north of this epicenter." (February 4, 2022)

 

The last earthquake of M>=3.3 in or near New Hampshire was an M 4.0 on October 16, 2012 and an M 4.5 on October 10, 2012. Forecast 152684 had expected today's event in New Hampshire was likely around April 24, 2023. This activity is located at 143 degrees from the M 7.0 in Java of April 14, 2023 and at the third node (120 degrees) from the M 7.2 in the Kermadec Islands of April 24 and was probably promoted by energy from those sources.

 

 

O: 25APR2023 13:49:07  43.8N   71.5W mb=2.9  EMSC   NEW HAMPSHIRE                

O: 25APR2023 13:49:07  43.8N   71.5W MB=3.3  ECAN of Concord, NH   

P: 24APR2023 152684    43.0N   71.0W 2.0-4.3 AAAAA  New England                

 

An unusual pair of earthquakes of M 3.7 and 4.6 occurred today in the Colombia-Ecuador border region. The M 4.6 is the strongest earthquake within about 150 km of this epicenter since an M 5.7 on July 25, 2022.  This epicenter is located near the antipode of the M 7.2 in Nias, Indonesia of April 24 and was probably promoted by energy from that source. This epicenter is located near the antipode of the M 7.2 in Nias, Indonesia This epicenter is located near the antipode of the M 7.2 in Nias, Indonesia of April 24 and was probably promoted by energy from that source. Forecast 152538 had expected this activity was likely around April 28 in this region.

 

O: 26APR2023 03:20:03   0.8N   77.9W ML=3.7  EMSC   COLOMBIA-ECUADOR BORDER REGION

O: 26APR2023 03:16:22   0.7N   78.1W mb=4.6  EMSC   COLOMBIA-ECUADOR BORDER REGION

P: 28APR2023 152538     1.0S   77.0W 4.0-5.6 ABAAA  Ecuador                    

 

An M 3.6 earthquake in Southern California occurred today east of Los Angeles. NEIC reported it was felt with maximum intensity IV in Cabazon and II-III in Forest Falls, Banning, Angelus Oaks, Yucaipa, Beaumont, White Water, Calimesa, Big Bear Lake and Jacinto and as far as Los Angeles and Hollywood among others.  This is the strongest event within about 75 km of this epicenter since an M 3.8 on May 16, 2022 and an M 3.7 on September 25, 2020. A strong earthquake of M 6.2 hit this area about 50 km to the southeast on April 23, 1992. Forecast 152646 had expected today's activity in this region was likely around April 28, 2023.

 

O: 26APR2023 06:46:56  34.1N  116.8W ML=3.5  EMSC   SOUTHERN CALIFORNIA          

P: 28APR2023 152646    34.6N  116.7W 2.5-4.8 AAAAA  So. California             

 

 

 

 

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of the Nias, Indonesia April 24, 2023, where promoted seismicity is considered likely.

 

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 25APR2023 19:10:25  24.8N  122.2E ML=4.2  TAI    Hualien, Taiwan              

P: 24APR2023 152599    24.0N  123.0E 4.0-5.4 AAAAA  Taiwan                     

P: 27APR2023 152595    25.0N  123.0E 4.0-5.4 AAAAA  Ryukyu Islands             

 

CWB reported this earthquake was felt with intensity I in Yilan, Hualien and Hsinchu Counties, Taiwan.

 

O: 26APR2023 05:18:54  37.7N   45.5E ML=4.0  EMSC   NORTHWESTERN IRAN            

P: 23APR2023 152632    36.0N   46.0E 3.8-5.2 BBAAA  No. Iran                   

P: 30APR2023 152662    38.0N   44.0E 3.5-5.3 BAAAA  Turkey                     

 

O: 25APR2023 15:34:31  34.5N  122.7E mb=4.7  EMSC   YELLOW SEA                   

P: 21APR2023 152625    30.0N  129.0E 3.5-4.9 BCCAA  Kyushu, Japan area         

 

O: 25APR2023 07:25:02  44.9N   52.5E mb=4.5  EMSC   WESTERN KAZAKHSTAN           

P: 23APR2023 152676    40.0N   50.0E 4.0-5.8 ACBAA  Kazakhstan                 

 

NEIC reported this earthquake of M 4.5 in Kazakhstan was felt with intensity II-III in the area(s) of Kazakhstan at Aktau, Mankistau.

 

INDONESIA AND PHILIPPINES

 

O: 26APR2023 06:49:47   0.9S  123.8E ML=4.3  EMSC   SULAWESI, INDONESIA          

P: 26APR2023 152552     1.0S  123.0E 4.0-5.4 AAAAA  Sulawesi area              

 

O: 25APR2023 20:11:47   2.3N  124.5E ML=4.1  EMSC   CELEBES SEA                  

P: 29APR2023 152527     2.0N  126.0E 4.0-5.4 BABAA  Mindanao, Philippines      

 

O: 25APR2023 11:53:27   3.7S  135.0E ML=4.3  EMSC   PAPUA, INDONESIA             

O: 25APR2023 18:55:47   4.0S  134.1E mb=4.7  EMSC   NEAR S COAST OF PAPUA, INDONES

P: 24APR2023 152554     2.0S  134.0E 4.0-5.4 ABAAA  West Irian, PNG            

 

O: 26APR2023 05:39:52   4.1N  124.7E ML=4.7  EMSC   CELEBES SEA                  

P: 23APR2023 152529     5.0N  126.0E 4.0-5.4 BABAA  Mindanao, Philippines      

P: 23APR2023 152529     6.0N  124.0E 4.0-5.7 BBAAA  Mindanao, Philippines      

 

O: 26APR2023 00:19:07   4.4S  144.5E mb=4.5  EMSC   NEAR N COAST OF NEW GUINEA, PN

P: 24APR2023 152545     7.0S  145.0E 4.0-5.5 ACAAA  New Ireland                 

 

O: 26APR2023 02:56:24   4.7N   95.4E mb=4.7  EMSC   NORTHERN SUMATRA, INDONESIA  

O: 26APR2023 06:34:09   5.0N   95.0E mb=4.8  EMSC   NORTHERN SUMATRA, INDONESIA  

P: 26APR2023 152530     4.0N   96.0E 4.0-5.6 AAAAA  Nicobar Islands            

 

O: 25APR2023 11:04:05   5.0S  129.8E ML=4.0  EMSC   BANDA SEA                    

P: 22APR2023 152555     6.0S  131.0E 4.0-5.6 BAAAA  West Irian, PNG            

 

O: 26APR2023 01:18:53   6.6S  155.6E mb=5.0  EMSC   BOUGAINVILLE REGION, P.N.G.  

P: 28APR2023 152542     7.0S  154.0E 4.0-5.4 AABAA  New Britain                

 

O: 26APR2023 04:20:26  14.0N  145.2E mb=4.5  EMSC   ROTA REGION, N. MARIANA ISLAND

P: 27APR2023 152580    14.0N  147.0E 4.0-5.4 AABAA  So. Marianas/Guam          

 

NEIC reported this earthquake of M 4.5 in Guam was felt with intensity II-III in the area(s) of Guam in Tamuning and Barrigada.

 

 

CENTRAL AND SOUTH AMERICA

 

O: 26APR2023 03:20:03   0.8N   77.9W ML=3.7  EMSC   COLOMBIA-ECUADOR BORDER REGION

O: 26APR2023 03:16:22   0.7N   78.1W mb=4.6  EMSC   COLOMBIA-ECUADOR BORDER REGION

P: 28APR2023 152538     1.0S   77.0W 4.0-5.6 ABAAA  Ecuador                    

 

O: 25APR2023 08:21:43  13.3N   90.3W ML=4.1  EMSC   OFFSHORE EL SALVADOR         

P: 24APR2023 152564    13.0N   90.0W 3.5-5.1 AAAAA  Guatemala                  

 

O: 25APR2023 15:34:17  15.7N   93.9W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 28APR2023 152560    16.0N   95.0W 3.5-5.2 BAAAA  Chiapas, Mexico            

 

O: 25APR2023 19:03:12  16.4N   94.8W ML=4.0  EMSC   OAXACA, MEXICO               

P: 27APR2023 152560    17.0N   94.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O: 25APR2023 10:41:42  17.6N  100.8W ML=4.0  EMSC   GUERRERO, MEXICO             

P: 26APR2023 152577    18.0N  100.0W 3.5-5.5 AAAAA  Oaxaca, Mexico             

 

O: 25APR2023 20:48:00  17.7S   69.5W ML=4.0  EMSC   TARAPACA, CHILE              

P: 27APR2023 152752    17.0S   71.0W 4.0-5.7 AABAA  So. Peru/Bolivia           

 

O: 26APR2023 04:31:54  14.5N   93.0W ML=4.1  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 27APR2023 152559    14.0N   93.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 26APR2023 02:06:27  18.6N   73.2W ML=3.1  EMSC   HAITI REGION

O: 25APR2023 13:03:54  18.4N   72.8W ML=3.1  EMSC   HAITI REGION                 

P: 26APR2023 152584    19.0N   73.0W 3.0-4.8 AAAAA  Bahamas/No. Caribbean      

 

O: 26APR2023 06:35:15  19.1N   70.6W ML=3.2  EMSC   DOMINICAN REPUBLIC           

P: 24APR2023 152584    20.0N   71.0W 3.0-4.8 AAAAA  Bahamas/No. Caribbean      

 

O: 25APR2023 09:19:42  19.5N   65.8W Md=3.7  EMSC   PUERTO RICO REGION           

P: 27APR2023 152566    19.0N   65.0W 3.0-5.2 AAAAA  Leeward Islands            

 

O: 26APR2023 05:52:21  27.9S   66.7W mb=4.6  EMSC   CATAMARCA, ARGENTINA         

P: 24APR2023 152762    29.0S   68.0W 4.0-5.6 ABAAA  Argentina                  

 

 

AFRICA AND EUROPE

 

 

O: 25APR2023 17:41:28  34.9N   14.3E mb=4.1  EMSC   CENTRAL MEDITERRANEAN SEA    

P: 22APR2023 152626    35.0N   14.0E 3.0-4.8 BAAAA  Mediterranean/Sicily       

 

O: 26APR2023 04:48:32  37.9N   36.3E ML=4.1  EMSC   CENTRAL TURKEY               

O: 25APR2023 22:14:08  38.0N   37.3E mb=4.0  EMSC   CENTRAL TURKEY

P: 24APR2023 152660    38.0N   36.0E 3.5-5.1 AAAAA  Turkey                     

 

SOUTHWEST PACIFIC

 

O: 25APR2023 11:00:40  14.8S  167.4E mb=4.5  EMSC   VANUATU                      

P: 29APR2023 152759    15.0S  167.0E 4.0-5.4 BAAAA  Vanuatu Islands            

 

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

 

OCEAN RIDGES

 

O: 26APR2023 00:14:01   9.1S   67.2E Mw=5.7  EMSC   MID-INDIAN RIDGE             

P: 23APR2023 152750    14.0S   66.0E 4.0-5.4 BCAAA  So. Indian Ocean           

 

O: 25APR2023 11:12:25  41.3S   86.1W mb=5.3  EMSC   WEST CHILE RISE              

P: 23APR2023 152784    41.0S   88.0W 4.0-5.4 AABAA  Chile Rise                 

 

O: 25APR2023 21:06:58  58.7S   25.2W mb=4.8  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 17APR2023 152517    58.0S   26.0W 4.0-5.9 CAAAA  So. Sandwich Islands       

P: 23APR2023 152789    60.0S   29.0W 4.0-6.0 ABBAA  So. Sandwich Islands       

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 25APR2023 22:21:42  40.3S  176.5E ML=3.9  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 25APR2023 22:28:11  40.3S  176.6E ML=4.3  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 26APR2023 01:12:24  40.3S  176.6E ML=4.3  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 26APR2023 06:01:56  40.3S  176.5E ML=4.2  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 25APR2023 22:16:13  40.4S  176.7E Mw=5.4  EMSC   NORTH ISLAND OF NEW ZEALAND

O: 25APR2023 22:19:03  40.3S  176.6E mb=5.2  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 25APR2023 22:16:13  40.3S  176.7E MS=5.9  GEONET North Island, N.Z.

O: 25APR2023 22:19:02  40.3S  176.7E ML=5.5  GEONET North Island, N.Z.

P: 21APR2023 152780    39.0S  178.0E 3.0-4.4 BBAAA  North Island, N.Z.         

P: 25APR2023 152785    40.0S  174.0E 3.0-4.5 AABAA  North Island, N.Z.         

 

O: 25APR2023 09:46:16  39.9S  176.9E ML=3.8  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 25APR2023 09:46:16  39.9S  176.9E MS=4.0  GEONET North Island, New Zealand

P: 21APR2023 152780    39.0S  178.0E 3.0-4.4 BAAAA  North 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. 1247 reports of felt events were made of which 794 reported weak and 427 light intensity with 22 reports of moderate shaking and 4 with strong and 0 severe and 0 with extreme intensity came from the area.

 

O: 25APR2023 22:19:03  40.3S  176.6E mb=5.2  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 25APR2023 22:16:13  40.3S  176.7E MS=5.9  GEONET North Island, N.Z.

O: 25APR2023 22:19:02  40.3S  176.7E ML=5.5  GEONET North Island, N.Z.

P: 21APR2023 152780    39.0S  178.0E 3.0-4.4 BBAAA  North Island, N.Z.         

P: 25APR2023 152785    40.0S  174.0E 3.0-4.5 AABAA  North Island, N.Z.         

 

GEONET reported the M 5.9 was felt with moderate to strong intensity in the area southeast of Wellington, New Zealand and in southern North Island and northern South Island. 22188 reports of felt events were made of which 7778 reported weak and 8758 light intensity with 4609 reports of moderate shaking and 936 with strong and 79 severe and 29 with extreme intensity came from the area.

GEONET the quake of M 5.5 was felt with moderate to strong intensity in the area southeast of Wellington, New Zealand and in southern North Island and northern South Island. 20836 reports of felt events were made of which 7220 reported weak and 8381 light intensity with 4284 reports of moderate shaking and 846 with strong and 76 severe and 29 with extreme intensity came from the area.

 

O: 25APR2023 17:25:46  46.3S  167.1E ML=4.1  EMSC   OFF W. COAST OF S. ISLAND, N.Z

P: 23APR2023 152786    45.0S  168.0E 3.0-5.2 AAAAA  So. Island, N.Z.           

P: 27APR2023 152786    45.0S  167.0E 3.0-5.1 AAAAA  So. Island, N.Z.           

 

 

JAPAN AND KURIL ISLANDS

 

O: 25APR2023 17:49:35  37.8N  141.8E mb=4.5  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 26APR2023 152637    38.0N  142.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

O: 25APR2023 13:32:00  40.1N  141.8E mb=4.4  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 28APR2023 152672    41.0N  142.0E 3.5-5.4 BAAAA  Hokkaido, Japan            

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 26APR2023 07:34:33  37.3N  121.7W ml=3.2  ANSS   Seven Trees CA               

P: 26APR2023 152611    37.4N  121.8W 2.5-4.6 AAAAA  Central California         

 

NEIC reported this earthquake of M 3.2 in Central California was felt with intensity II-III in the area(s) of Central California in San Jose, Mount Hamilton, Coyote, Morgan Hill.

 

O: 25APR2023 07:36:01  30.7N  116.3W ML=3.3  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O: 25APR2023 20:18:08  30.7N  114.3W ML=3.8  EMSC   GULF OF CALIFORNIA

O: 25APR2023 22:00:49  30.7N  116.3W ML=3.2  EMSC   OFFSHORE BAJA CALIFORNIA, MEXICO

P: 22APR2023 152640    30.8N  115.8W 2.5-4.8 BAAAA  So. California             

 

O: 25APR2023 21:19:48  31.8N  115.2W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO      

P: 25APR2023 152640    31.5N  115.7W 2.5-4.9 AAAAA  So. California             

 

O: 25APR2023 11:57:29  33.4N  116.4W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 25APR2023 11:55:47  33.4N  116.4W Ml=2.7  EMSC   SOUTHERN CALIFORNIA          

P: 22APR2023 152642    33.4N  116.7W 2.5-4.5 BAAAA  So. California             

 

NEIC reported this earthquake of M 2.7 in Southern California was felt with intensity II-III in the area(s) of Southern California in Borrego Springs and Palm Desert.

 

O: 26APR2023 06:46:56  34.1N  116.8W ML=3.5  EMSC   SOUTHERN CALIFORNIA          

P: 28APR2023 152646    34.6N  116.7W 2.5-4.8 AAAAA  So. California             

 

O: 25APR2023 19:26:48  34.9N  117.9W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

P: 24APR2023 152645    34.2N  117.8W 2.5-4.9 AAAAA  So. California             

 

O: 26APR2023 04:38:53  39.1N  123.1W Md=2.5  EMSC   NORTHERN CALIFORNIA          

O: 25APR2023 10:42:43  39.4N  122.9W Md=2.2  EMSC   NORTHERN CALIFORNIA          

P: 25APR2023 152614    39.3N  123.2W 2.5-4.8 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.5 in Northern California was felt with intensity II-III in the area(s) of Northern California in Lakeport, Ukiah.

 

ALASKA

 

O: 25APR2023 23:05:44  51.4N  176.9W ml=3.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 24APR2023 152708    50.3N  176.2W 3.5-5.0 ABAAA  Andreanoff Isls, Aleutians 

 

O: 25APR2023 17:40:14  52.2N  173.8W mb=3.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 22APR2023 152710    51.2N  174.4W 3.5-5.2 BAAAA  Andreanoff Isls, Aleutians 

 

NEIC reported this earthquake of M 3.8 in the Andreanof Islands, Alaska was felt with intensity IV in the area(s) of the Andreanof Islands, Alaska in Atka.

 

O: 26APR2023 06:47:19  58.1N  151.5W ML=3.2  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 26APR2023 152731    60.0N  153.5W 3.2-4.9 ABAAA  Central Alaska             

 

O: 24APR2023 19:27:52  59.7N  138.1W MB=1.9  ECAN of Yakutat, AK                 

P: 24APR2023 152730    60.0N  138.0W 3.2-4.9 AAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 25APR2023 14:39:49  50.4N  130.3W MB=3.0  ECAN of Port Hardy, BC              

P: 27APR2023 152712    50.9N  130.6W 3.0-5.3 AAAAA  British Colombia           

 

ROCKY MOUNTAINS REGION

 

O: 25APR2023 08:15:44  46.6N  114.1W Ml=2.2  EMSC   WESTERN MONTANA              

P: 23APR2023 152681    44.5N  115.2W 2.0-3.9 ACAAA  Montana/Idaho              

 

O: 25APR2023 07:40:51  31.6N  103.9W ML=3.1  EMSC   WESTERN TEXAS

O: 25APR2023 08:16:09  31.6N  104.0W ML=2.2  EMSC   WESTERN TEXAS

O: 25APR2023 08:30:20  31.6N  104.0W ML=2.1  EMSC   WESTERN TEXAS

O: 25APR2023 08:49:34  31.7N  104.4W ML=2.1  EMSC   WESTERN TEXAS

O: 25APR2023 23:50:36  31.7N  104.5W ML=2.9  EMSC   WESTERN TEXAS

O: 25APR2023 07:31:52  31.6N  104.0W ML=2.2  EMSC   WESTERN TEXAS                

P: 17APR2023 152357    31.7N  104.3W 2.0-4.1 CAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 25APR2023 10:28:21  28.9N   98.5W ML=2.1  EMSC   SOUTHERN TEXAS               

P: 24APR2023 152594    28.0N   98.0W 3.0-4.8 AAAAA  Northern Mexico            

 

O: 25APR2023 13:49:07  43.8N   71.5W mb=2.9  EMSC   NEW HAMPSHIRE                

O: 25APR2023 13:49:07  43.8N   71.5W MB=3.3  ECAN of Concord, NH   

P: 24APR2023 152684    43.0N   71.0W 2.0-4.3 AAAAA  New England                

 

O: 24APR2023 22:16:18  47.2N   76.2W MB=3.9  ECAN of Grand-Remous, QC, felt      

P: 19APR2023 152408    47.0N   76.0W 2.0-4.2 BAAAA  New York State             

 

HAWAII

 

O: 25APR2023 19:54:41  19.4N  155.3W Ml=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25APR2023 21:30:27  19.3N  155.1W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII     

P: 26APR2023 152588    19.3N  155.1W 4.0-5.8 AAAAA  Hawaii area                

 

NEIC reported this earthquake of M 3.0 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Hawaii National Park.

 

 

MAJOR EARTHQUAKE IN NIAS, INDONESIA FOLLOWED BY ANTIPODAL EVENT IN ECUADOR

 

EARTHQUAKE SUMMARY FOR APRIL 24, 2023

 

The strongest earthquake in the world today was a major  M 7.1-7.3 in the Nias region of Indonesia south of Sumatra. NEIC reported it was felt with maximum intensity VI in Sumatra at Bukit Tinggi; V in Padang Sidempuan, Sibolga, Sungaipenuh, Jambi, and IV in Pdang, Sumatra with intensity II-III in Pekan Baru, Duria, and Medan among others. BMG gave this event M 7.3 with intensity up to IX in Nias Island with some minor damage. This is at the same epicenter as a series of strong foreshocks on April 22, 2023. These had been described on April 22 in this summary as:

 

 

"A series of moderate to strong earthquakes of M 6.1, 5.8 and 5.5 occurred in the Nias region southwest of Sumatra today. These were the strongest earthquakes in the world today.  BMG reported these earthquakes of M 5.9, 6.1 and 5.5 in Nias, Sumatra, Indonesia were felt with intensity IV in Nias, Mentawai; III in Nandailing natal, Mias, Agam, and II ikn Tapanuli, Padang, Pasaman, Bukittinggi, Pariaman, Rokan Hulu and Mesuji, Indonesia. These earthquakes may be related to the recent eclipse-induced seismicity in Central Indonesia but they are not specifically eclipse-induced. They are, however likely related to strong tidal stresses with the new moon and eclipse of April 20 as the first in the series of M 5.9-6.1 occurred within minutes of local solar midnight when tidal stresses are maximized. Forecast 152267 had expected today's enhanced seismicity in this region within about 100 km was likely around April 18. This activity may have also been promoted by the M 6.7 in Ecuador of March 18, 2023 as it is antipodal to that mainshock." (April 22, 2023)

 

The only earthquake of M>=7.1 in the past 35 years within about 250 km of today's epicenter was an M 7.0 in Sumatra on February 25, 2008. This followed an event of M 8.2 about 350 km to the southeast of this on September 13, 2007. When the earthquake occurred on February 25, 2008, this summary noted:

 

 

"The strong earthquake swarm which has been hitting the region if Kepulauan Mentawai in southern Sumatra, Indonesia over the past week reached a climax today with earthquakes of M 7.0, 6.6 and 6.3. The mainshock was felt in Indonesia with intensity IV at Padang and Curup .... Associated Press reported that residents in Bengkulu, Padang and the nearby town of Mukomuko said they felt the quake strongly and many people fled their homes. A tsunami warning was issued but no tsunami was reported observed although small waves may have occurred. People in the area are getting used to these strong earthquake are far less rattled by them at this time than in previous months.  People in Padang hospitals were evacuated from their buildings despite heavy rain at the time of the quake. Bloomberg.com reported that dozens of homes were damaged and a health clinic was leveled in the M 6.6 aftershock in the Mentawai Islands region.

 

The last earthquake(s) of similar or greater magnitude listed by NEIC in the region of  KEPULAUAN MENTAWAI within 259 km of this epicenter in the region bounded by ( 0.1- 4.7S  97.7-102.3E) occurred as an earthquake of magnitude M 7.1 which hit on 10/24/2007 at 3.91S 101.06E in the region of KEPULAUAN MENTAWAI." (February 25, 2008)

 

The M 8+ in Sumatra on September 13, 2007 followed an M 7.0 in Colombia the day before and was considered as an antipodal aftershock of that event. Today's activity was also proposed at the time of the M 6.7 in Ecuador of March to be likely far-field antipodal activity as noted in this summary at the time:

 

"The antipode of today's event in Ecuador is at 3N 100E in the Andaman Islands, India and Sumatra Indonesia which is an active seismic zone. Seismic enhancment in this area is likely." (March 19, 2023)

 

Forecasts 152531 and 152550 had expected today's activity was likely within about 100 km of today's epicenter between April 25 and 28, 2023.

 

O: 24APR2023 20:00:57   0.9S   98.4E ML=7.3  BMG    NIAS, INDONESIA                         

O: 24APR2023 20:16:16   0.4S   98.9E ML=4.5  EMSC   KEPULAUAN BATU, INDONESIA

O: 25APR2023 03:40:22   0.7S   98.8E ML=4.5  EMSC   KEPULAUAN BATU, INDONESIA

O: 24APR2023 22:19:16   0.9S   98.5E mb=4.9  EMSC   KEPULAUAN BATU, INDONESIA

O: 24APR2023 20:39:00   1.0S   98.2E ML=4.6  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 24APR2023 20:00:55   0.8S   98.5E mw=7.1  ANSS   Teluk Dalam Indonesia

O: 24APR2023 20:00:56   0.7S   98.6E Mw=7.1  EMSC   KEPULAUAN BATU, INDONESIA    

P: 25APR2023 152531     2.0N   99.0E 4.0-5.6 AACAA  So. Sumatera               

P: 28APR2023 152531     0.0N   98.0E 4.0-5.5 BAAAA  So. Sumatera               

P: 28APR2023 152550     2.0S   99.0E 4.0-5.7 BBAAA  So. of Sumatera            

 

An M 5.3 followed later in the day near the antipode of the Nias M 7.1 near the antipode in Ecuador. NEIC reported this event was felt in Ecuador with maximum intensity IV in Machala El Oro, and Guayaquil, Guayas and IV in Reque, Lambayque, Peru. Lesser shaking was felt in Ecuador at Eloy Alfaro, Santa Lucia, Cuenca, Azuay, Pinas, El Oro, Ambato Tungurahua. This is the strongest earthquake in Ecuador since the M 6.7 on March 18, 2023. It occurred within minutes of local solar midnight and was probably promoted by strong effects from tides and the current geomagnetic storm, as it lies near the geomagnetic equator. Forecast 152538 had expected this event within about 150 km of this epicenter in Ecuador was likely around April 24.

 

O: 25APR2023 05:36:00   2.8S   79.8W Mw=5.3  EMSC   NEAR COAST OF ECUADOR        

P: 24APR2023 152538     4.0S   80.0W 4.0-5.6 ABAAA  Ecuador                    

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 South of Alaska. The last earthquakes of M>=4.8 within about 200 km of this epicenter occurred with M 5.0 on January 10, 2023 and M 4.9 on September 20, 2022. The last event of significantly larger magnitude in this area was an M 5.6 on October 31, 2021. Forecast 152431 had expected today's activity was likely in this area around April 17. This epicenter is at 100 degrees from the M 7.3 in Nias, Indonesia today and may have been promoted by energy from that region.

 

O: 24APR2023 13:09:11  54.9N  157.9W mb=4.8  EMSC   SOUTH OF ALASKA              

P: 17APR2023 152431    56.7N  157.9W 3.5-5.1 CBAAA  Alaska Peninsula           

 

A light to moderate earthquakes occurred today in Southern Quebec, Canada with M 3.9. ECAN reported this earthquake was felt in the epicentral region. This follows a similar earthquake in the region of Syracuse, New York yesterday. It is the strongest earthquake within about 100 km of this epicenter in Southern Quebec since an M 3.9 on May 9, 2020 and prior to that an M 5.1 on October 1, 2007. It is likely that this event near the longitude of maximum tidal stress with the new moon and solar eclipse of April 20, was promoted by tidal stresses. Forecast 152408 had expected enhanced seismicity within about 25 km of this epicenter was likely around April 19. Like the earthquake in New York yesterday, this epicenter is at the third node (120 degrees) from the M 7.1 in the Kermadec Islands of April 24, 2023 and may have been promoted by energy from that source.

 

O: 24APR2023 22:16:18  47.2N   76.1W ML=3.9  EMSC   SOUTHERN QUEBEC, CANADA      

O: 24APR2023 22:16:18  47.2N   76.2W ML=3.9  ECAN   SOUTHERN QUEBEC, Grand-Remous, CANADA      

P: 19APR2023 152408    47.0N   76.0W 2.0-4.2 BAAAA  New York State             

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.1 in the area of the Nias, Indonesia April 24, 2023, where promoted seismicity is considered likely.

 

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 24APR2023 10:02:44  31.7N   52.8E ML=4.3  EMSC   CENTRAL IRAN                 

P: 27APR2023 152652    31.0N   50.0E 3.8-5.2 BABAA  So. Iran                   

 

O: 24APR2023 20:15:02  23.8N   90.6E ML=4.0  EMSC   BANGLADESH                   

P: 25APR2023 152592    23.0N   94.0E 4.0-5.5 AACAA  Myanmar                    

 

O: 24APR2023 14:13:04  43.4N   83.8E mb=4.4  EMSC   NORTHERN XINJIANG, CHINA     

P: 25APR2023 152677    42.0N   82.0E 4.0-5.5 ABBAA  Kirgizstan/Xinjiang        

 

O: 24APR2023 13:35:38  22.8N  121.2E ML=4.2  EMSC   TAIWAN REGION                

O: 24APR2023 13:35:38  22.8N  121.2E ML=4.2  TAI    Hualien, Taiwan              

P: 26APR2023 152599    23.0N  122.0E 4.0-5.4 AAAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity IV in Taitung and I in Hualien and Pingtung Counties, Taiwan.

 

O: 24APR2023 18:31:51  24.2N  122.0E ML=4.1  TAI    Hualien, Taiwan              

P: 24APR2023 152599    24.0N  123.0E 4.0-5.4 AAAAA  Taiwan                     

 

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

 

INDONESIA AND PHILIPPINES

 

O: 24APR2023 23:20:39   6.2N  126.8E mb=4.8  ANSS   ESE of Pondaguitan Philippines

P: 24APR2023 152522     7.0N  126.0E 4.0-5.6 AAAAA  Central Philippines        

 

O: 24APR2023 20:16:16   0.4S   98.9E ML=4.5  EMSC   KEPULAUAN BATU, INDONESIA

O: 25APR2023 03:40:22   0.7S   98.8E ML=4.5  EMSC   KEPULAUAN BATU, INDONESIA

O: 24APR2023 22:19:16   0.9S   98.5E mb=4.9  EMSC   KEPULAUAN BATU, INDONESIA

O: 24APR2023 20:39:00   1.0S   98.2E ML=4.6  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 24APR2023 20:00:55   0.8S   98.5E mw=7.1  ANSS   Teluk Dalam Indonesia

O: 24APR2023 20:00:56   0.7S   98.6E Mw=7.1  EMSC   KEPULAUAN BATU, INDONESIA    

P: 25APR2023 152531     2.0N   99.0E 4.0-5.6 AACAA  So. Sumatera               

P: 28APR2023 152531     0.0N   98.0E 4.0-5.5 BAAAA  So. Sumatera               

P: 28APR2023 152550     2.0S   99.0E 4.0-5.7 BBAAA  So. of Sumatera            

 

O: 24APR2023 16:10:59   1.6N  122.8E ML=4.0  EMSC   MINAHASA, SULAWESI, INDONESIA

P: 25APR2023 152519     1.0N  122.0E 4.0-5.6 AAAAA  Celebes Sea                

 

O: 24APR2023 13:39:53   2.5S  142.8E ML=4.0  EMSC   NEAR N COAST OF NEW GUINEA, PN

P: 29APR2023 152554     2.0S  139.0E 4.0-5.4 BACAA  West Irian, PNG            

 

O: 24APR2023 16:33:46   4.4S  143.3E mb=5.0  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

O: 24APR2023 19:41:35   4.4S  143.4E ML=4.3  EMSC   NEW GUINEA, PAPUA NEW GUINEA

O: 25APR2023 03:15:02   4.7S  143.3E ML=4.3  EMSC   NEW GUINEA, PAPUA NEW GUINEA

P: 17APR2023 152264     5.0S  144.0E 4.0-5.4 CAAAA  Papua New Guinea            

 

NEIC reported this earthquake of M 5.0 in New Guinea was felt with intensity II-III in the area(s) of New Guinea in Mount Hagen.

 

O: 24APR2023 11:35:44   4.9S  102.9E mb=4.8  EMSC   SOUTHERN SUMATRA, INDONESIA  

P: 22APR2023 152551     4.0S  103.0E 4.0-5.4 AAAAA  So. of Sumatera            

 

O: 24APR2023 23:20:38   6.2N  127.0E mb=4.8  EMSC   MINDANAO, PHILIPPINES        

P: 24APR2023 152522     7.0N  126.0E 4.0-5.6 AAAAA  Central Philippines        

 

O: 24APR2023 10:42:01   7.0S  129.6E ML=4.4  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 24APR2023 152533     7.0S  129.0E 4.0-5.6 AAAAA  Banda Sea                  

 

O: 24APR2023 09:32:12   9.3N  125.5E mb=5.0  EMSC   MINDANAO, PHILIPPINES        

O: 24APR2023 15:20:48   9.0N  126.3E mb=4.5  EMSC   MINDANAO, PHILIPPINES

P: 22APR2023 152522     9.0N  126.0E 4.0-5.6 AAAAA  Central Philippines        

 

NEIC reported this earthquake of M 5.0 in Mindanao, Philippines was felt with intensity II-III in the area(s) of Mindanao, Philippines in Butuan and Gamut, Caraga and VII in Cagayan.

PHIVOLCS reported intensity IV shaking in Santiago, Jabonga, Magallanes, Buenavista, Remedios T. Romauldez, Tuby, City of Cabadbarana dn City of Butuan, Agusan Del Norte and III in Nasipit, Kitcharao, Carmen and Las Nieves, Agusan Del Norte; Alegria, Bacuag, Gigaquit, Placer, Tagana-an and Tubod Surigao del Norte and Carascal, Cantilan and Madrid, Surigao Del Sur.

 

O: 24APR2023 10:58:33   9.4N   93.9E mb=5.1  EMSC   NICOBAR ISLANDS, INDIA REGION

P: 27APR2023 152556    10.0N   93.0E 4.0-5.4 BAAAA  Andaman Islands            

 

O: 24APR2023 14:17:22  11.8S  119.9E ML=4.3  EMSC   SOUTH OF SUMBA, INDONESIA    

P: 23APR2023 152754    11.0S  119.0E 4.0-5.8 AAAAA  So. of Indonesia           

 

CENTRAL AND SOUTH AMERICA

 

O: 25APR2023 05:36:00   2.8S   79.8W Mw=5.3  EMSC   NEAR COAST OF ECUADOR        

P: 24APR2023 152538     4.0S   80.0W 4.0-5.6 ABAAA  Ecuador                    

 

O: 24APR2023 20:14:30   8.8N   83.9W ML=4.8  EMSC   COSTA RICA                   

P: 26APR2023 152524     9.0N   83.0W 3.5-5.2 AAAAA  Costa Rica                 

 

O: 24APR2023 13:38:38  10.6N   62.2W mb=4.6  EMSC   GULF OF PARIA, VENEZUELA     

P: 25APR2023 152581    11.0N   62.0W 3.4-5.4 AAAAA  Windward Islands           

 

O: 24APR2023 12:07:11  16.1N   99.2W ML=4.0  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 23APR2023 152577    16.0N   99.0W 3.5-5.4 AAAAA  Oaxaca, Mexico             

 

O: 25APR2023 00:16:29  16.5N   95.1W ML=4.1  EMSC   OAXACA, MEXICO               

P: 27APR2023 152560    17.0N   94.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O: 25APR2023 02:07:06  18.0N   66.8W Md=3.1  EMSC   PUERTO RICO

O: 24APR2023 07:21:14  18.5N   66.1W Md=3.1  EMSC   PUERTO RICO REGION

O: 24APR2023 21:29:10  19.0N   67.5W Md=3.0  EMSC   PUERTO RICO REGION

O: 24APR2023 11:41:38  18.0N   67.0W Md=3.1  EMSC   PUERTO RICO                  

P: 25APR2023 152578    18.0N   67.0W 3.4-5.4 AAAAA  Puerto Rico                

 

O: 24APR2023 15:14:17  20.6N  106.7W ML=4.2  EMSC   OFF COAST OF JALISCO, MEXICO 

P: 22APR2023 152571    19.0N  105.0W 3.5-5.5 ABBAA  Michoacan, Mexico          

 

O: 24APR2023 08:45:09  30.8S   68.7W mb=4.5  EMSC   SAN JUAN, ARGENTINA          

P: 24APR2023 152777    30.0S   69.0W 4.0-5.5 AAAAA  Coast Central Chile        

 

AFRICA AND EUROPE

 

O: 24APR2023 17:25:42  37.4N    8.5W ML=2.4  EMSC   PORTUGAL                     

P: 28APR2023 152628    39.0N    8.0W 3.5-5.3 BAAAA  Morocco/Spain              

 

O: 24APR2023 07:13:39  71.8N    1.5W Mw=4.0  EMSC   JAN MAYEN ISLAND REGION      

O: 24APR2023 08:44:03  72.8N    5.4E Mw=3.4  EMSC   NORWEGIAN SEA                

P: 28APR2023 152743    72.0N    0.0E 3.0-4.5 BAAAA  Norway                     

 

SOUTHWEST PACIFIC

 

O: 25APR2023 04:44:30  12.3S  166.9E mb=4.6  EMSC   SANTA CRUZ ISLANDS            

P: 26APR2023 152758    12.0S  166.0E 4.0-5.5 AAAAA  Vanuatu 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

 

O: 24APR2023 16:06:00  32.4S  119.3E ML=2.7  EMSC   WESTERN AUSTRALIA            

P: 28APR2023 152781    31.0S  117.0E 2.0-4.4 BBBAA  So. Australia              

 

O: 24APR2023 07:28:35  29.6S  177.0W mb=4.9  EMSC   KERMADEC ISLANDS REGION

O: 24APR2023 09:25:59  30.2S  177.4W mb=4.9  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 24APR2023 16:26:34  30.2S  177.6W mb=5.0  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 22APR2023 152778    30.0S  177.0W 4.0-5.5 AAAAA  No. Kermadec Islands       

 

O: 25APR2023 05:10:43  31.0S  179.8E ML=4.3  EMSC   KERMADEC ISLANDS REGION      

P: 25APR2023 152779    31.0S  178.0E 4.0-5.5 AAAAA  No. Kermadec Islands       

 

JAPAN AND KURIL ISLANDS

 

No earthquakes of M>=4 were located in Japan or the Kuril Islands today.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 24APR2023 21:04:07  31.0N  114.2W ML=3.7  EMSC   GULF OF CALIFORNIA

O: 24APR2023 18:49:25  31.3N  115.3W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO

O: 24APR2023 16:49:18  31.4N  115.3W ML=3.5  EMSC   BAJA CALIFORNIA, MEXICO

O: 24APR2023 20:49:24  30.7N  116.3W ML=3.3  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O: 25APR2023 06:53:29  30.9N  114.4W ML=4.0  EMSC   GULF OF CALIFORNIA           

P: 25APR2023 152640    31.5N  115.7W 2.5-4.9 AABAA  So. California             

 

O: 24APR2023 07:59:54  30.9N  116.2W ML=3.8  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 22APR2023 152640    30.8N  115.8W 2.5-4.8 AAAAA  So. California             

 

O: 24APR2023 18:46:01  31.3N  115.2W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO      

P: 25APR2023 152640    31.5N  115.7W 2.5-4.9 AAAAA  So. California             

 

O: 24APR2023 19:00:54  32.7N  116.9W Ml=2.0  EMSC   SOUTHERN CALIFORNIA          

P: 22APR2023 152642    33.4N  116.7W 2.5-4.5 AAAAA  So. California             

 

O: 24APR2023 19:25:44  33.0N  116.0W Ml=2.3  EMSC   SOUTHERN CALIFORNIA          

P: 26APR2023 152640    32.6N  116.1W 2.5-4.6 AAAAA  So. California             

 

O: 25APR2023 04:12:14  35.8N  121.2W ML=2.9  EMSC   CENTRAL CALIFORNIA           

P: 28APR2023 152638    35.8N  121.3W 2.5-4.5 BAAAA  Off So. California         

 

NEIC reported this earthquake of M 3.2 in Central California was felt with intensity II-III in the area(s) of Central California in Lockwood, Cambria, Atascadero.

 

O: 25APR2023 06:44:21  35.9N  117.7W Ml=2.0  EMSC   CENTRAL CALIFORNIA           

P: 27APR2023 152650    35.9N  117.7W 2.5-4.4 AAAAA  So. California             

 

O: 24APR2023 16:01:43  38.8N  122.8W Md=2.0  EMSC   NORTHERN CALIFORNIA           

P: 25APR2023 152613    38.8N  122.8W 2.5-4.4 AAAAA  Central California         

 

O: 24APR2023 07:24:27  39.8N  120.7W ML=2.3  EMSC   NORTHERN CALIFORNIA          

P: 23APR2023 152615    39.8N  120.6W 2.5-4.6 AAAAA  Central California         

 

 

ALASKA

 

O: 24APR2023 13:09:11  54.9N  157.9W mb=4.8  EMSC   SOUTH OF ALASKA              

P: 17APR2023 152431    56.7N  157.9W 3.5-5.1 CBAAA  Alaska Peninsula           

 

O: 24APR2023 09:59:13  56.5N  152.5W ml=3.2  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 25APR2023 152738    55.0N  149.0W 3.0-5.0 ABBAA  Northern Alaska            

 

O: 25APR2023 03:38:15  59.6N  152.1W ML=3.8  EMSC   SOUTHERN ALASKA              

P: 26APR2023 152731    60.0N  153.5W 3.2-4.9 AAAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.5 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska in Anchor Point, Homer, Sterling.

 

O: 24APR2023 16:51:43  51.6N  178.5E ml=4.0  ANSS   Rat Islands                  

P: 27APR2023 152724    52.0N  179.0E 4.0-5.8 BAAAA  Rat Islands                

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 24APR2023 11:44:01  46.2N  123.0W Ml=2.2  EMSC   WASHINGTON                   

P: 26APR2023 152695    45.3N  121.7W 2.0-4.1 AAAAA  Oregon state, U.S.          

 

O: 24APR2023 14:54:44  49.3N  127.9W ML=2.7  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 26APR2023 152702    48.3N  128.5W 2.8-4.9 AAAAA  Vancouver Island area      

 

ROCKY MOUNTAINS REGION

 

O: 24APR2023 08:07:33  32.4N  104.5W ML=2.6  EMSC   NEW MEXICO

O: 25APR2023 03:28:22  31.7N  104.4W ML=2.8  EMSC   WESTERN TEXAS                

P: 17APR2023 152357    31.7N  104.3W 2.0-4.1 CAAAA  SW U.S.A                   

 

O: 24APR2023 10:22:02  44.8N  116.2W Ml=2.1  EMSC   SOUTHERN IDAHO               

P: 20APR2023 152401    44.6N  116.0W 2.0-4.0 BAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

 

O: 24APR2023 22:16:18  47.2N   76.1W ML=3.9  EMSC   SOUTHERN QUEBEC, CANADA      

O: 24APR2023 22:16:18  47.2N   76.2W ML=3.9  ECAN   SOUTHERN QUEBEC, Grand-Remous, CANADA      

P: 19APR2023 152408    47.0N   76.0W 2.0-4.2 BAAAA  New York State             

 

ECAN reported this earthquake was felt in the epicentral region.

 

O: 24APR2023 07:33:55  34.6N   96.2W ml=1.6  ANSS   km W of Wardville            

P: 26APR2023 152656    34.0N   97.0W 2.0-4.4 AAAAA  Southern Plains            

 

HAWAII

 

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

 

 

GEOMAGNETIC STORM TRIGGERS QUAKES IN KERMADEC IS. UNUSUAL EVENT IN NEW YORK

 

EARTHQUAKE SUMMARY FOR APRIL 23, 2023

 

 

A severe geomagnetic storm hit the earth today following a strong CME on the

sun several days ago. This storm began mid-day (UT) and intensified through

the remainder of the day reaching maximum KP of 8 around 22:00-24:00 UT on

April 23. GOES magnetometers show this storm beginning about 18:10 UT with a second major Sudden Commencement about 19:50 UT and peaking about 23:00 UT on April 23. Earthquakes at 18:10 UT in New York (M 3.6-4.1) and Tajikistan (M 4.4) were almost certainly triggered by the sudden commencement also at 18:10 UT. Global AP with today's  storm was 66 with high latitude AP at 76. Mid-latitude A index as 32 and included K-indices of 6 at 20-24:00 UT on April 23. The last such storm with AP>=66 occurred a month ago on March 24, 2023 with AP 66 and high latitude AP 68, slightly smaller than today's storm and prior to that on February 27, 2023 when global AP was 94 with high latitude AP 88 (Data from SWPC). The last time K-values equalled or exceeded 8 as they did today was on November 4, 2021 with AP 69 and high latitude AP 131. Aurora were spectacular with today's storm, described by many as amazing and unprecedented and were

expected to be seen into southern U.S. latitudes.

 

A series of unusual earthquake occurred with this geomagnetic storm. These include the M 3.6-4.1 near Syracuse and Watertown, New York and an M 7.1 in the  Kermadec Islands, New Zealand.

 

A major M 7.1-7.2 earthquake occurred at the height of this geomagnetic storm in the area of the Kermadec Islands, New Zealand. A tsunami of small height was possible with this earthquake but only locally. It was not reported felt in this remote area. An M 6.9 in the Kermadec Islands of March 4, 2023 followed a major geomagnetic storm of February 27-28, 2023. A series of foreshocks south of this epicenter in the Kermadec Islands was also noted on April 17-18, 2023 in this summary as:

 

 

"A series of earthquakes occurred in the Kermadec Islands today. This included

events of M 5.2, 5.0, 5.0 and 5.0 among others of M 4.5-4.9. Most of these occurred near local solar midnight and was probably promoted by tidal stresses which maximize near this hour with the new moon of April 20, 2023.  The first in this series was an M 5.3 on April 16, 2023 and an M 4.3 at local midnight on April 16. The last earthquake in Kermadec Islands within about 150 km of today's events with M>5.3 occurred on  August 29, 2022 with M 5.8.." (April 18, 2023)

 

An earthquake of M 7.0 hit about 250 km east of this epicenter on March 16, 2023

and major earthquakes of M 8.1 and 7.4 hit the area on March 4, 2021.

 

Like today's M 7.1 the earthquake on March 16, 2023 also occurred near local

solar noon as noted at the time in this summary:

 

 

"The strongest earthquake in the world today was an M 7.0 in the Kermadec Islands. NEIC reported it was lightly felt as far as Whakatane Bay of Plenty and Wellington, North Island, New Zealand. This earthquake occurred within minutes of local solar noon and was likely promoted by high tidal stresses at this hour." (March 16, 2023)

 

The earthquakes in March, 2021 were also associated with a strong geomagnetic storm as noted at the time in this summary:

 

"The current activity is located near the geomagnetic equator and was probably promoted by the current geomagnetic storm, the strongest since November, 2020" (March 5, 2021)

 

The history of major earthquakes in this region was described in this summary on March 5, 2021 as:

 

" ... The last great earthquakes in the Kermadec Islands within about 500 km of today's events occurred with M 8.3 on October 20, 1986 and an M 8.2 and 8.0 on January 14, 1976.  Other earthquakes in area of M>=8.1 occurred since 1900 on May 1, 1917 (M 8.6) and February 27, 1955 (M 8.0)." (March 5, 2021)

 

Three foreshocks of M 4.9, 4.9 and 5.0 were recorded along with a number of moderate aftershocks. The M 7.1 occurred within minutes of local solar noon and was likely triggered by geomagnetic and tidal effects which maximize near this hour. Forecast 152778 had expected today's activity was likely within about 50 km of this epicenter around April 22.

 

O: 23APR2023 16:24:06  29.6S  176.9W mb=4.9  EMSC   KERMADEC ISLANDS REGION

O: 23APR2023 16:51:21  29.7S  177.0W mb=4.9  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 24APR2023 01:05:21  29.7S  177.6W mb=5.4  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 24APR2023 00:41:56  29.9S  177.8W Mw=7.1  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 24APR2023 00:41:56  30.0S  177.8W mw=7.1  ANSS   Kermadec Islands New Zealand"

O: 23APR2023 16:51:25  29.9S  177.5W mb=5.0  ANSS   Kermadec Islands New Zealand

O: 24APR2023 01:51:51  30.0S  177.6W mb=5.3  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 22APR2023 152778    30.0S  177.0W 4.0-5.5 AAAAA  No. Kermadec Islands       

 

 

 

 

An M 3.6-4.1 was widely felt in upstate New York east of Rochester today. NEIC reported maximum intensity V in Greenwood Center, Jay, Adamas Center, Auburn New York and in Gananoque, Ontario, Canada, IV in Constableville, Camden, Cleveland, Syracuse, Remsen, Star Lake, Rome, Liverpool, East Syracuse, Port Leyden, Brewerton, Greig, Hastings, Turin,  Utica, New Hartford, Stratford, Adams, Sackets Harbor, Rodman, Watertown, Henderson, Mannsville, Calcium with III in Ellisburg, Dexter, New York among others. It was also reported felt with light intensity II-IV in Vermont, Ontario. This earthquake occurred near local solar noon and may have been promoted by stresses associated with the new moon and eclipse of April 20 which maximize near this hour. The mainshock was followed by a series of light aftershocks. It occurred at 18:10 UT - within a minute of the sudden commencement and  major magnetic field shift associated with today's geomagnetic storm (as per GOES Satellite data) and was probably triggered by geomagnetic effects. The last earthquake within about 200 km of today's event in New York with M>=3.6 occurred as an M 3.7 on September 9, 2015 but the last within about 150 km occurred more than 35 years ago.

 

Forecasts 152407 and 152686 had expected this activity within about 150 km was likely around April 18-24, 2023. This earthquake is located near the maximum tidal stress longitude with the new moon and at 143 degrees from the M 7.0 in Java of April 14, 2023 and may have been promoted by energy associated with those events.

 

 

O: 23APR2023 18:10:08  43.9N   76.0W Mw=3.6  EMSC   NEW YORK                     

O: 23APR2023 19:12:17  43.9N   76.0W ml=1.3  ANSS   Adams Center New York

O: 23APR2023 18:38:42  43.9N   76.0W ml=1.4  ANSS   Adams Center New York

O: 23APR2023 18:23:47  43.8N   76.0W ml=1.5  ANSS   New York

O: 23APR2023 18:21:45  43.9N   76.0W ml=1.5  ANSS   Adams Center New York

O: 23APR2023 18:10:08  43.9N   76.0W mr=3.6  ANSS   Adams Center New York

O: 23APR2023 18:10:08  43.8N   76.1W MB=4.1  ECAN SW of Watertown, NY  

P: 18APR2023 152407    43.0N   78.0W 2.0-4.1 BABAA  New York State             

P: 24APR2023 152686    44.5N   73.7W 2.0-4.3 AABAA  New York State             

 

An accompanying earthquake in Tajikistan of M 4.4 also occurred at 18:10 UT and also likely triggered by geomagnetic changes. This event was expected around April 23 in forecast 152621 within about 50 km of this epicenter.

 

O: 23APR2023 18:10:45  37.5N   70.1E mb=4.4  EMSC   TAJIKISTAN                    

P: 23APR2023 152621    37.0N   70.0E 3.8-5.4 AAAAA  Hindu Kush/Pakistan        

 

 

 

Two moderately large earthquakes of M 5.4 and 5.6 also occurred with the geomagnetic  storm in the region of the South Sandwich Islands. The largest of these (an M 5.6 at 02:17 UT on April 24) occurred near local solar midnight and were probably promoted, like the event in the Kermadec Islands, by strong tidal stresses and the new moon which maximized near this hour. The first of these events of M 5.4 may also have been triggered by geomagnetic changes between 2300 and 2400 UT which reached their highest GOES-18 values during this time. Forecast 152789 had expected this activity was likely around April 23-24, 2023.

 

O: 23APR2023 23:39:33  59.7S   26.6W Mw=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 24APR2023 02:17:56  60.4S   26.2W mb=5.6  ANSS   South Sandwich Islands region"

O: 24APR2023 02:17:56  60.4S   26.1W mb=5.6  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 23APR2023 152789    60.0S   29.0W 4.0-6.0 AABAA  So. Sandwich Islands       

P: 24APR2023 152789    56.0S   26.0W 4.0-6.1 ACAAA  So. Sandwich Islands       

 

A series of light earthquakes of M 2.0-2.6 occurred at or near local solar noon in the region of San Francisco, California and may have been triggered by strong tidal effects which maximize near this hour. They also occurred with the sudden commencement the field reversal of the geomagnetic storm today at 19:30 UT and was probably triggered  by effects from that storm. NEIC reported this activity was felt lightly with intensity II-III in Antioch, Clayton, Concord, Pittsburg, Brentwood, Oakley, Discovery Bay, Martinez, Oakland, Berkeley, Stockton, San Francisco, San Ramon and Daly City, California.  A similar swarm on April 20, 2023 also hit this area and was described in this summary as:

 

"A moderate earthquake of M 3.7-3.8 hit the San Francisco Bay, California region today. It was reported to have been widely felt in the region by NEIC. NEIC reported it was felt with intensity II-III in Northern California at Clayton, Antioch, Brentwood, Danville, Concord, Pittsburg, Walnut Creek, Alamo, Concord, and much of the area of eastern San Francisco. This event occurred within minutes of the total eclipse of the sun (at 04:12 UT) and was probably triggered by strong tidal stresses with that alignment." (April 20, 2023)

 

These two series suggest the area is under high stress and is subject to geomagnetic and tidal triggering and is likely to see a stronger event in the near future. Forecasts 152611 and 152612 had expected today's active was  likely around April 22-26. This epicenter is located at 104 degrees from the M 7.2 in Molucca of January 18, 2023 and at 102-103 degrees from the M 7.8 in Turkey and the M 7.2 in Tajikistan of February, 203 and was probably promoted by energy from those sources.

 

O: 23APR2023 19:48:53  38.0N  121.8W Md=2.5  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 23APR2023 20:01:29  38.0N  121.8W Md=2.1  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 23APR2023 20:20:17  38.0N  121.8W ML=2.6  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 23APR2023 20:59:07  38.0N  121.8W MD=2.6  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 23APR2023 20:59:07  38.0N  121.8W md=2.7  ANSS   SSW of Antioch CA

O: 23APR2023 20:20:18  38.0N  121.8W ml=2.8  ANSS   SW of Antioch CA

O: 23APR2023 20:01:29  37.9N  121.8W md=2.1  ANSS   SSW of Antioch CA

O: 23APR2023 19:48:53  38.0N  121.8W md=2.5  ANSS   SW of Antioch CA

O: 23APR2023 19:30:17  38.0N  121.8W md=2.4  ANSS   SW of Antioch CA

O: 23APR2023 19:30:17  38.0N  121.8W Md=2.4  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 22APR2023 152611    37.3N  121.6W 2.5-4.5 AAAAA  Central California         

P: 26APR2023 152612    37.8N  122.6W 2.5-4.4 BAAAA  Central California         

 

A series of earthquakes of M 3-4 also occurred with the sudden commencement of today's geomagnetic storm in the area of the Gulf of California and Baja California. This activity had been expected at this time around April 22 in Forecast 152640 but was probably triggered by magnetic variations at the start of today's storm.

 

O: 23APR2023 19:12:25  30.8N  114.3W ML=3.4  EMSC   GULF OF CALIFORNIA

O: 23APR2023 18:24:36  30.7N  113.8W ML=3.8  EMSC   GULF OF CALIFORNIA           

O: 23APR2023 19:13:42  30.8N  114.4W ML=3.5  EMSC   GULF OF CALIFORNIA            

P: 25APR2023 152640    31.5N  115.7W 2.5-4.9 AABAA  So. California             

 

O: 23APR2023 18:37:44  30.8N  116.1W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO

O: 23APR2023 22:52:59  30.0N  116.8W ML=4.0  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O: 23APR2023 10:53:35  30.7N  116.3W ML=3.7  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O: 23APR2023 09:47:47  30.8N  116.2W ML=3.2  EMSC   OFFSHORE BAJA CALIFORNIA, MEXIC

P: 22APR2023 152640    30.8N  115.8W 2.5-4.8 AAAAA  So. California             

 

O: 23APR2023 21:50:38  31.4N  115.4W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO      

P: 25APR2023 152640    31.5N  115.7W 2.5-4.9 AAAAA  So. California             

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.2 in the area of the Kermadec Islands, April 23, 2023, where promoted seismicity is considered likely.

 

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

 

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 23APR2023 16:27:48  30.3N   71.1E mb=4.8  EMSC   PAKISTAN                     

P: 22APR2023 152639    34.0N   70.0E 3.8-5.3 ACAAA  Pakistan                   

 

NEIC reported this earthquake of M 4.8 in Pakistan was felt with intensity II-III in the area(s) of Pakistan in Fatehpur (VII), Kot Addu, Punjab (VI) and Multan (V).

 

O: 23APR2023 18:10:45  37.5N   70.1E mb=4.4  EMSC   TAJIKISTAN                   

P: 23APR2023 152621    37.0N   70.0E 3.8-5.4 AAAAA  Hindu Kush/Pakistan        

 

O: 23APR2023 07:08:04  51.3N  159.8E mb=4.2  EMSC   OFF EAST COAST OF KAMCHATKA  

O: 23APR2023 07:27:11  51.5N  159.6E mb=4.3  EMSC   OFF EAST COAST OF KAMCHATKA

P: 21APR2023 152718    52.0N  158.0E 4.0-6.0 AABAA  Kamchatka                  

P: 23APR2023 152715    53.0N  160.0E 4.0-5.5 ABAAA  E. of Kamchatka            

 

INDONESIA AND PHILIPPINES

 

O: 23APR2023 22:31:18   1.2S  123.7E ML=4.1  EMSC   SULAWESI, INDONESIA          

P: 24APR2023 152552     2.0S  124.0E 4.0-5.4 AAAAA  Sulawesi area              

 

O: 24APR2023 06:45:15   2.9S  129.8E ML=4.2  EMSC   SERAM, INDONESIA             

P: 23APR2023 152555     3.0S  130.0E 4.0-5.4 AAAAA  West Irian, PNG            

 

O: 23APR2023 21:28:33   3.5N  126.8E mb=4.5  EMSC   KEPULAUAN TALAUD, INDONESIA  

P: 23APR2023 152529     5.0N  126.0E 4.0-5.4 ABAAA  Mindanao, Philippines      

 

O: 23APR2023 12:19:28   4.4S  143.1E mb=4.8  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P: 17APR2023 152264     5.0S  144.0E 4.0-5.4 CAAAA  Papua New Guinea           

 

NEIC reported this earthquake of M 4.8 in Papua New Guinea was felt with intensity II-III in the area(s) of Papua New Guinea in Wabag Enga and Mount Hagen.

 

O: 23APR2023 15:40:16   6.5S  128.2E ML=4.0  EMSC   BANDA SEA                    

P: 22APR2023 152533     7.0S  128.0E 4.0-5.5 AAAAA  Banda Sea                  

 

O: 23APR2023 16:56:43   7.1S  131.9E ML=4.0  EMSC   KEP. TANIMBAR REGION, INDONESI

P: 24APR2023 152555     7.0S  130.0E 4.0-5.7 AABAA  West Irian, PNG            

 

O: 24APR2023 00:28:19   8.2N  123.0E ML=4.0  EMSC   MINDANAO, PHILIPPINES        

P: 20APR2023 152235     7.0N  124.0E 4.0-5.4 BBAAA  Central Philippines        

 

O: 23APR2023 16:23:19  14.3N  119.0E Mw=5.2  EMSC   PHILIPPINE ISLANDS REGION    

P: 25APR2023 152568    14.0N  121.0E 3.5-5.1 AABAA  Luzon, Philippines         

 

NEIC reported this earthquake of M 5.2 in the Central Philippines was felt with intensity II-III in the area(s) of  Manila, Philippines

PHIVOLCS reported intensity III in Looc, and Lubang, Occidental Mindoro and II in San Antonio, Zambales, Quezon City, Philippines.

 

O: 23APR2023 09:19:21  17.5N  122.3E mb=5.3  EMSC   LUZON, PHILIPPINES           

P: 24APR2023 152568    16.0N  120.0E 3.5-4.9 ABBAA  Luzon, Philippines         

 

NEIC reported this earthquake of M 5.3 in Northern Philippines was felt with intensity II-III in the area(s) of Northern Philippines in Ugad Cagayan Valley.

 

 

CENTRAL AND SOUTH AMERICA

 

O: 23APR2023 22:32:34  12.7N   89.8W ML=4.3  EMSC   OFFSHORE EL SALVADOR         

P: 23APR2023 152561    13.0N   89.0W 3.5-5.3 AAAAA  Coast of Central America   

 

O: 23APR2023 14:11:17  14.4N   92.9W mb=4.3  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 27APR2023 152559    14.0N   93.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

 

O: 24APR2023 04:31:42  15.2N   94.6W ML=4.1  EMSC   OFF COAST OF OAXACA, MEXICO  

P: 23APR2023 152559    15.0N   94.0W 3.5-5.6 AAAAA  Chiapas, Mexico            

 

O: 23APR2023 07:09:06  15.7S   74.6W ML=4.1  EMSC   NEAR COAST OF SOUTHERN PERU  

P: 23APR2023 152752    16.0S   73.0W 4.0-5.6 AABAA  So. Peru/Bolivia           

 

 

 

O: 23APR2023 23:02:55  16.2N   98.1W ML=4.1  EMSC   OAXACA, MEXICO

O: 23APR2023 08:17:21  15.9N   97.3W ML=4.0  EMSC   OAXACA, MEXICO               

P: 25APR2023 152576    15.0N   98.0W 3.5-5.6 AAAAA  Oaxaca, Mexico             

 

 

O: 23APR2023 14:37:36  15.6N   94.9W ML=4.3  EMSC   OFFSHORE OAXACA, MEXICO

O: 24APR2023 04:39:00  17.3N   94.7W ML=4.0  EMSC   VERACRUZ, MEXICO             

P: 27APR2023 152560    17.0N   94.0W 3.5-5.5 BAAAA  Chiapas, Mexico            

 

 

O: 23APR2023 08:57:30  18.2N   67.4W Md=3.1  EMSC   MONA PASSAGE, PUERTO RICO

O: 23APR2023 23:37:11  17.9N   68.7W Md=3.8  EMSC   DOMINICAN REPUBLIC REGION    

P: 25APR2023 152579    19.0N   68.0W 3.4-5.3 ABAAA  Puerto Rico                

 

O: 24APR2023 03:17:27  31.8S   69.6W mb=4.5  EMSC   SAN JUAN, ARGENTINA          

P: 24APR2023 152777    30.0S   69.0W 4.0-5.5 ABAAA  Coast Central Chile        

 

O: 24APR2023 03:56:28  33.6S   72.1W Mw=4.7  EMSC   OFFSHORE VALPARAISO, CHILE   

P: 25APR2023 152776    33.0S   73.0W 4.0-5.8 AAAAA  Central Chile              

 

NEIC reported this earthquake of M 4.7 in Valparaiso, Chile was felt with intensity II-III in the area(s) of Valparaiso, Chile in Valparaiso, Quilpue, Vina del Mar, Villa Alemana and in Santiago.

 

 

O: 23APR2023 22:31     27.2S   70.2W mb=3.9  GUC    Atacama at Copiapo, Tierra Ama

P: 27APR2023 152762    28.0S   71.0W 4.0-5.8 AAAAA  Coast Central Chile        

 

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

 

O: 23APR2023 11:38:53  30.7S   71.3W mb=4.2  EMSC   COQUIMBO, CHILE

O: 23APR2023 11:38     30.7S   71.3W mb=4.5  GUC    Coquimbo at Monte Patria, Oval

P: 22APR2023 152776    32.0S   72.0W 4.0-5.9 ABAAA  Central Chile              

 

GUC reported this earthquake was felt with intensity  IV in  Coquimbo at Monte Patria, Ovalle, Rio Hurtado; III in Combarbala, Punitaqui and II in La Serena, Andacollo, Paiguano, Chile.

 

O: 23APR2023 23:02:55  16.2N   98.1W ML=4.1  EMSC   OAXACA, MEXICO

 

 

AFRICA AND EUROPE

 

O: 24APR2023 01:01:56  43.0N    0.8W ML=3.5  EMSC   PYRENEES                     

P: 24APR2023 152671    43.0N    0.0E 3.0-5.0 AAAAA  France                     

P: 24APR2023 152701    43.0N    1.0W 3.0-5.1 AAAAA  Spain                      

 

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

 

SOUTHWEST PACIFIC

 

O: 23APR2023 17:03:05  20.2S  176.4W mb=4.5  EMSC   FIJI REGION                  

P: 23APR2023 152770    20.0S  176.0W 4.0-5.6 AAAAA  Tonga Islands              

 

O: 23APR2023 15:24:03  25.0S  179.7E mb=4.4  EMSC   SOUTH OF FIJI ISLANDS        

P: 26APR2023 152773    24.0S  179.0E 4.0-5.7 BAAAA  Tonga/Fiji                 

 

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

 

OCEAN RIDGES

 

O: 24APR2023 04:37:30   0.2N   17.2W mb=4.8  EMSC   NORTH OF ASCENSION ISLAND    

P: 26APR2023 152535     1.0S   16.0W 4.0-5.7 ABAAA  Central Mid-Atlantic       

 

O: 24APR2023 06:51:24   3.6N  101.9W mb=4.6  EMSC   GALAPAGOS TRIPLE JUNCTION REGI

O: 24APR2023 06:08:04   4.0N  102.3W mb=4.1  EMSC   GALAPAGOS TRIPLE JUNCTION REGION

 

O: 23APR2023 23:39:33  59.7S   26.6W Mw=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 24APR2023 02:17:56  60.4S   26.2W mb=5.6  ANSS   South Sandwich Islands region"

O: 24APR2023 02:17:56  60.4S   26.1W mb=5.6  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 23APR2023 152789    60.0S   29.0W 4.0-6.0 AABAA  So. Sandwich Islands       

P: 24APR2023 152789    56.0S   26.0W 4.0-6.1 ACAAA  So. Sandwich Islands       

 

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 23APR2023 16:24:06  29.6S  176.9W mb=4.9  EMSC   KERMADEC ISLANDS REGION

O: 23APR2023 16:51:21  29.7S  177.0W mb=4.9  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 24APR2023 01:05:21  29.7S  177.6W mb=5.4  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 24APR2023 00:41:56  29.9S  177.8W Mw=7.1  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 24APR2023 00:41:56  30.0S  177.8W mw=7.1  ANSS   Kermadec Islands New Zealand"

O: 23APR2023 16:51:25  29.9S  177.5W mb=5.0  ANSS   Kermadec Islands New Zealand

O: 24APR2023 01:51:51  30.0S  177.6W mb=5.3  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 22APR2023 152778    30.0S  177.0W 4.0-5.5 AAAAA  No. Kermadec Islands       

 

O: 23APR2023 19:06:11  40.1S  176.6E ML=3.9  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 23APR2023 19:06:11  40.1S  176.6E MS=4.0  GEONET North Island, New Zealand

P: 25APR2023 152785    40.0S  174.0E 3.0-4.5 AABAA  North 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. 202 reports of felt events were made of which 123 reported weak and 72 light intensity with 6 reports of moderate shaking and 1 with strong and 0 severe and 0 with extreme intensity came from the area.

It was probably triggered by geomagnetic changes near 19:00 UT with the strong geomagnetic

storm today. 

 

JAPAN AND KURIL ISLANDS

 

O: 24APR2023 00:19:42  28.2N  142.7E mb=5.2  EMSC   BONIN ISLANDS, JAPAN REGION  

P: 24APR2023 152585    27.0N  140.0E 4.0-5.4 ABBAA  Bonin Islands              

P: 27APR2023 152635    30.0N  142.0E 4.0-5.5 BBAAA  Off East Coast Honshu      

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 23APR2023 19:12:25  30.8N  114.3W ML=3.4  EMSC   GULF OF CALIFORNIA

O: 23APR2023 18:24:36  30.7N  113.8W ML=3.8  EMSC   GULF OF CALIFORNIA           

O: 23APR2023 19:13:42  30.8N  114.4W ML=3.5  EMSC   GULF OF CALIFORNIA           

P: 25APR2023 152640    31.5N  115.7W 2.5-4.9 AABAA  So. California             

 

O: 23APR2023 18:37:44  30.8N  116.1W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO

O: 23APR2023 22:52:59  30.0N  116.8W ML=4.0  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O: 23APR2023 10:53:35  30.7N  116.3W ML=3.7  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O: 23APR2023 09:47:47  30.8N  116.2W ML=3.2  EMSC   OFFSHORE BAJA CALIFORNIA, MEXIC

P: 22APR2023 152640    30.8N  115.8W 2.5-4.8 AAAAA  So. California             

 

O: 23APR2023 21:50:38  31.4N  115.4W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO      

P: 25APR2023 152640    31.5N  115.7W 2.5-4.9 AAAAA  So. California              

 

O: 24APR2023 04:48:39  33.4N  116.2W Ml=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 22APR2023 152642    33.4N  116.7W 2.5-4.5 AAAAA  So. California             

 

O: 23APR2023 10:36:05  36.9N  121.4W Md=2.7  EMSC   CENTRAL CALIFORNIA            

O: 23APR2023 10:36:05  36.9N  121.4W md=2.7  ANSS   NNW of Hollister CA

P: 22APR2023 152611    37.3N  121.6W 2.5-4.5 AAAAA  Central California         

P: 27APR2023 152610    36.7N  121.4W 2.5-4.4 ABAAA  Central California         

 

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 Hollister, Los Banos and Los Gatos.

 

O: 24APR2023 00:22:40  37.5N  117.9W ml=2.3  EMSC   CENTRAL CALIFORNIA           

P: 22APR2023 152604    37.4N  117.2W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 23APR2023 18:27:28  37.7N  122.5W Md=2.4  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 26APR2023 152612    37.8N  122.6W 2.5-4.4 BAAAA  Central California         

 

 

O: 23APR2023 19:48:53  38.0N  121.8W Md=2.5  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 23APR2023 20:01:29  38.0N  121.8W Md=2.1  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 23APR2023 20:20:17  38.0N  121.8W ML=2.6  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 23APR2023 20:59:07  38.0N  121.8W MD=2.6  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 23APR2023 20:59:07  38.0N  121.8W md=2.7  ANSS   SSW of Antioch CA

O: 23APR2023 20:20:18  38.0N  121.8W ml=2.8  ANSS   SW of Antioch CA

O: 23APR2023 20:01:29  37.9N  121.8W md=2.1  ANSS   SSW of Antioch CA

O: 23APR2023 19:48:53  38.0N  121.8W md=2.5  ANSS   SW of Antioch CA

O: 23APR2023 19:30:17  38.0N  121.8W md=2.4  ANSS   SW of Antioch CA

O: 23APR2023 19:30:17  38.0N  121.8W Md=2.4  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 22APR2023 152611    37.3N  121.6W 2.5-4.5 AAAAA  Central California         

P: 26APR2023 152612    37.8N  122.6W 2.5-4.4 BAAAA  Central California         

 

ALASKA

 

O: 23APR2023 09:31:47  62.9N  150.7W ML=3.5  EMSC   CENTRAL ALASKA               

P: 25APR2023 152735    63.2N  151.4W 3.2-5.1 AAAAA  Central Alaska             

 

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

 

O: 24APR2023 02:39:06  65.7N  155.3W ML=3.1  EMSC   NORTHERN ALASKA              

P: 25APR2023 152735    63.2N  151.4W 3.2-5.1 ACCAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 23APR2023 16:20:25  47.6N  122.3W Ml=2.0  EMSC   SEATTLE-TACOMA AREA, WASHINGTO

P: 21APR2023 152703    46.9N  122.0W 2.0-3.9 AAAAA  Washington state, U.S.     

 

O: 23APR2023 21:12:22  49.3N  120.5W Ml=2.1  EMSC   BRITISH COLUMBIA, CANADA     

P: 28APR2023 152703    48.9N  122.1W 2.0-4.3 BABAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O: 23APR2023 09:55:24  41.5N  112.2W ML=2.5  EMSC   UTAH                         

P: 23APR2023 152704    43.0N  111.5W 2.0-4.4 ABAAA  Yellowstone/Wyoming        

 

NEIC reported this earthquake of M 2.5 in Utah was felt with intensity II-III in the area(s) of Utah in Corinne, Roy and Smithfield.

 

EASTERN U.S./CANADA

 

O: 23APR2023 09:46:47  36.3N   89.5W Md=2.1  EMSC   TENNESSEE                    

P: 25APR2023 152629    36.0N   89.0W 2.0-3.9 AAAAA  New Madrid area            

 

O: 23APR2023 18:10:08  43.9N   76.0W Mw=3.6  EMSC   NEW YORK                     

O: 23APR2023 19:12:17  43.9N   76.0W ml=1.3  ANSS   Adams Center New York

O: 23APR2023 18:38:42  43.9N   76.0W ml=1.4  ANSS   Adams Center New York

O: 23APR2023 18:23:47  43.8N   76.0W ml=1.5  ANSS   New York

O: 23APR2023 18:21:45  43.9N   76.0W ml=1.5  ANSS   Adams Center New York

O: 23APR2023 18:10:08  43.9N   76.0W mr=3.6  ANSS   Adams Center New York

O: 23APR2023 18:10:08  43.8N   76.1W MB=4.1  ECAN SW of Watertown, NY  

P: 18APR2023 152407    43.0N   78.0W 2.0-4.1 BABAA  New York State             

P: 24APR2023 152686    44.5N   73.7W 2.0-4.3 AABAA  New York State             

 

 

 

O: 23APR2023 11:26:13  35.9N   97.9W ml=1.6  ANSS   S of Dover Oklahoma

O: 23APR2023 07:44:59  35.9N   97.9W ml=2.3  ANSS   NE of Kingfisher Oklahoma    

P: 24APR2023 152656    35.0N   97.0W 2.0-4.3 AAAAA  Southern Plains            

 

HAWAII

 

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

STRONG EARTHQUAKE SERIES NEAR NIAS, INDONESIA

 

EARTHQUAKE SUMMARY FOR APRIL 22, 2023

 

A series of moderate to strong earthquakes of M 6.1, 5.8 and 5.5 occurred in the

Nias region southwest of Sumatra today. These were the strongest earthquakes in the world today.  BMG reported these earthquakes of M 5.9, 6.1 and 5.5 in Nias, Sumatra, Indonesia were felt with intensity IV in Nias, Mentawai; III in Nandailing natal, Mias, Agam, and II ikn Tapanuli, Padang, Pasaman, Bukittinggi, Pariaman, Rokan Hulu and Mesuji, Indonesia. These earthquakes may be related to the recent eclipse-induced seismicity in Central Indonesia but they are not specifically eclipse-induced. They are, however likely related to strong tidal stresses with the new moon and eclipse of April 20 as the first in the series of M 5.9-6.1 occurred within minutes of local solar midnight when tidal stresses are maximized. Forecast 152267 had expected today's enhanced seismicity in this region within about 100 km was likely around April 18. This activity may have also been promoted by the M 6.7 in Ecuador of March 18, 2023 as it is antipodal to that mainshock.

 

O: 22APR2023 23:33:55   0.8S   98.5E ML=5.5  BMG    NIAS, INDONESIA                         

O: 22APR2023 17:09:46   0.8S   98.5E ML=5.9  BMG    NIAS, INDONESIA                         

O: 22APR2023 21:17:48   0.9S   98.4E ML=6.1  BMG    NIAS, INDONESIA                         

O: 22APR2023 23:33:56   0.7S   98.6E mb=5.3  EMSC   KEPULAUAN BATU, INDONESIA

O: 23APR2023 02:50:26   0.7S   98.6E ML=4.4  EMSC   KEPULAUAN BATU, INDONESIA

O: 23APR2023 05:20:21   0.7S   98.7E ML=4.1  EMSC   KEPULAUAN BATU, INDONESIA

O: 22APR2023 21:17:52   0.8S   98.5E Mw=5.8  EMSC   KEPULAUAN BATU, INDONESIA

O: 22APR2023 22:21:07   0.9S   98.4E ML=4.0  EMSC   KEPULAUAN BATU, INDONESIA

O: 22APR2023 22:23:57   0.9S   98.7E mb=4.6  EMSC   KEPULAUAN BATU, INDONESIA

O: 22APR2023 23:11:15   1.0S   98.4E mb=4.7  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 22APR2023 17:09:49   0.7S   98.7E Mw=6.1  EMSC   KEPULAUAN BATU, INDONESIA     

P: 18APR2023 152267     2.0S   99.0E 4.0-5.8 BBAAA  So. of Sumatera            

 

The series in Nias Indonesia followed a strong eclipse-related M 6.3-6.4 in the Banda Sea near the point of maximum eclipse with the solar eclipse of April 20. This event had been discussed in the previous issue of this summary as:

 

 

"Maximum duration of the total eclipse at this point in the Banda Sea where the

M 6.4 occurred today was about 1 minute 15 seconds within about 2 seconds of maximum duration of the total eclipse, so this is essentially the location of the maximum eclipse at 04:16 UT on April 20, 2023. In addition to being closely connected with the solar eclipse of April 20, this event may be a regional aftershock of the M 7.6 on January 9, 2023. That event occurred about 600 km southeast of today's epicenter. The last earthquake within about 250 km in the Banda Sea of M>=6.4 was an M 6.9 about 250  August 30, 2011. Forecasts 152254 and 152537 had expected today's activity in this area was likely around April 17-22." (April 22, 2023)

 

O: 22APR2023 10:00:57   5.2S  125.5E ML=4.3  EMSC   BANDA SEA

O: 22APR2023 12:53:15   5.2S  125.6E ML=4.2  EMSC   BANDA SEA

O: 22APR2023 08:23:43   5.3S  125.5E Mw=6.3  EMSC   BANDA SEA

O: 22APR2023 08:23:43   5.3S  125.5E Mw=6.4  BMG    BANDA SEA

O: 22APR2023 09:15:54   5.3S  125.6E mb=5.3  EMSC   BANDA SEA

O: 22APR2023 09:05:35   5.5S  125.6E ML=4.3  EMSC   BANDA SEA

O: 22APR2023 21:46:40   5.1S  125.3E ML=4.2  EMSC   BANDA SEA                    

P: 22APR2023 152537     5.0S  126.0E 4.0-6.4 AAAAA  Ceram area                 

 

 

The strongest earthquake felt in the U.S. or Canada today was an M 4.1 in Hawaii. NEIC reported it was felt with maximum intensity V in Volcano; IV in Hawaii National Park and Pepeekeo, and II-III in Mountain View, Pahoa,, Naalehu and Kailua Kona, Hawaii. A similar event of M 4.1 hit Hawaii on April 4, 2023. Forecast 152588 had expected today's quake was likely around April 26.

 

O: 23APR2023 03:19:22  19.1N  155.4W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 22APR2023 08:17:40  19.2N  155.5W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 23APR2023 00:23:47  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII     

O: 23APR2023 00:23:47  19.4N  155.3W ML=4.1  ANSS   ISLAND OF HAWAII, HAWAII     

P: 26APR2023 152588    19.3N  155.1W 4.0-5.8 BAAAA  Hawaii area                

 

The strongest earthquake (unfelt) in the U.S. today was an M 4.7 in the Aleutians near Atka, Alaska. A similar earthquake of M 4.7 hit about 150 km to the west of today's epicenter on April 21, 2023 but the last within less than 100 km was an M 4.9 on October 11, 2021. Forecast 152710 had expected this activity in the Andreanof Islands within about 50 km was likely around April 22.

 

 

O: 22APR2023 12:54:50  50.7N  174.4W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 22APR2023 152710    51.2N  174.4W 3.5-5.2 AAAAA  Andreanoff Isls, Aleutians 

 

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.0 in the area of Java April 14, 2023, where promoted seismicity is considered likely.

 

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

 

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 23APR2023 01:22:09  54.1N  169.3E mb=4.3  EMSC   KOMANDORSKIYE OSTROVA REGION 

P: 22APR2023 152719    55.0N  169.0E 4.0-5.7 AAAAA  Near Islands               

 

O: 22APR2023 12:47:50  54.3N  162.3E mb=4.4  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 24APR2023 152719    55.0N  163.0E 4.0-6.1 AAAAA  Komandorsky Isl            

 

O: 23APR2023 04:04:58  51.2N  160.2E mb=4.1  EMSC   OFF EAST COAST OF KAMCHATKA  

P: 21APR2023 152718    52.0N  158.0E 4.0-6.0 AABAA  Kamchatka                  

P: 23APR2023 152715    53.0N  160.0E 4.0-5.5 ABAAA  E. of Kamchatka            

 

INDONESIA AND PHILIPPINES

 

O: 22APR2023 07:30:18   0.2S  123.9E ML=4.2  EMSC   SULAWESI, INDONESIA          

P: 20APR2023 152241     0.0N  125.0E 4.0-5.4 AABAA  Mindanao, Philippines      

 

O: 22APR2023 12:07:29   0.6N  125.3E ML=4.1  EMSC   MOLUCCA SEA                  

P: 20APR2023 152241     0.0N  125.0E 4.0-5.4 AAAAA  Mindanao, Philippines      

 

O: 22APR2023 17:09:49   0.7S   98.7E Mw=6.1  EMSC   KEPULAUAN BATU, INDONESIA    

P: 18APR2023 152267     2.0S   99.0E 4.0-5.8 BBAAA  So. of Sumatera            

 

O: 22APR2023 10:15:17   2.0S  125.9E mb=4.9  EMSC   KEPULAUAN SULA, INDONESIA    

P: 26APR2023 152536     3.0S  126.0E 4.0-5.5 BAAAA  Ceram area                 

 

 

O: 23APR2023 02:45:15   2.8N  127.0E mb=4.5  EMSC   MOLUCCA SEA

O: 23APR2023 02:34:11   2.8N  127.2E ML=4.4  EMSC   MOLUCCA SEA                  

P: 25APR2023 152526     1.0N  128.0E 4.0-5.4 ABAAA  Halmahera                  

 

O: 22APR2023 10:32:07   3.6S  139.6E ML=4.3  EMSC   PAPUA, INDONESIA             

P: 29APR2023 152554     2.0S  139.0E 4.0-5.4 CBAAA  West Irian, PNG            

 

O: 23APR2023 00:04:50   3.7N  130.1E ML=4.5  EMSC   PALAU REGION                 

P: 17APR2023 152239     4.0N  129.0E 4.0-5.4 CAAAA  Halmahera                  

 

O: 22APR2023 10:00:57   5.2S  125.5E ML=4.3  EMSC   BANDA SEA

O: 22APR2023 12:53:15   5.2S  125.6E ML=4.2  EMSC   BANDA SEA

O: 22APR2023 08:23:43   5.3S  125.5E Mw=6.3  EMSC   BANDA SEA

O: 22APR2023 09:15:54   5.3S  125.6E mb=5.3  EMSC   BANDA SEA

O: 22APR2023 09:05:35   5.5S  125.6E ML=4.3  EMSC   BANDA SEA

O: 22APR2023 21:46:40   5.1S  125.3E ML=4.2  EMSC   BANDA SEA                    

P: 22APR2023 152537     5.0S  126.0E 4.0-6.4 AAAAA  Ceram area                 

 

O: 22APR2023 12:35:50   6.2N  126.1E ML=4.6  EMSC   MINDANAO, PHILIPPINES        

P: 23APR2023 152529     5.0N  126.0E 4.0-5.4 ABAAA  Mindanao, Philippines      

P: 24APR2023 152522     7.0N  126.0E 4.0-5.6 AAAAA  Central Philippines        

 

O: 22APR2023 11:15:05  14.7N  118.8E mb=4.9  EMSC   PHILIPPINE ISLANDS REGION    

P: 24APR2023 152568    16.0N  120.0E 3.5-4.9 ABAAA  Luzon, Philippines          

 

 

 

O: 22APR2023 23:33:55   0.8S   98.5E ML=5.5  BMG    NIAS, INDONESIA                         

O: 22APR2023 17:09:46   0.8S   98.5E ML=5.9  BMG    NIAS, INDONESIA                         

O: 22APR2023 21:17:48   0.9S   98.4E ML=6.1  BMG    NIAS, INDONESIA                         

O: 22APR2023 23:33:56   0.7S   98.6E mb=5.3  EMSC   KEPULAUAN BATU, INDONESIA

O: 23APR2023 02:50:26   0.7S   98.6E ML=4.4  EMSC   KEPULAUAN BATU, INDONESIA

O: 23APR2023 05:20:21   0.7S   98.7E ML=4.1  EMSC   KEPULAUAN BATU, INDONESIA

O: 22APR2023 21:17:52   0.8S   98.5E Mw=5.8  EMSC   KEPULAUAN BATU, INDONESIA

O: 22APR2023 22:21:07   0.9S   98.4E ML=4.0  EMSC   KEPULAUAN BATU, INDONESIA

O: 22APR2023 22:23:57   0.9S   98.7E mb=4.6  EMSC   KEPULAUAN BATU, INDONESIA

O: 22APR2023 23:11:15   1.0S   98.4E mb=4.7  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 22APR2023 17:09:49   0.7S   98.7E Mw=6.1  EMSC   KEPULAUAN BATU, INDONESIA    

P: 18APR2023 152267     2.0S   99.0E 4.0-5.8 BBAAA  So. of Sumatera            

 

CENTRAL AND SOUTH AMERICA

 

O: 22APR2023 21:03:04   1.4S   78.4W ML=2.5  EMSC   ECUADOR                      

P: 20APR2023 152253     1.0S   77.0W 4.0-5.6 AABAA  Ecuador                    

 

O: 22APR2023 13:40:41  14.4N   93.0W mb=4.3  EMSC   OFFSHORE CHIAPAS, MEXICO      

P: 23APR2023 152559    15.0N   94.0W 3.5-5.6 AAAAA  Chiapas, Mexico            

P: 27APR2023 152559    14.0N   93.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

 

O: 23APR2023 01:16:39  16.2N   96.2W ML=4.2  EMSC   OAXACA, MEXICO

O: 22APR2023 20:28:50  15.6N   95.0W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO      

P: 23APR2023 152560    15.0N   95.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O: 22APR2023 23:26:08  16.4N  100.9W ML=4.1  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 18APR2023 152290    17.0N  101.0W 3.5-5.7 BAAAA  Michoacan, Mexico          

 

O: 23APR2023 04:36:34  16.6N   94.0W ML=4.1  EMSC   CHIAPAS, MEXICO              

P: 23APR2023 152559    15.0N   94.0W 3.5-5.6 ABAAA  Chiapas, Mexico            

 

O: 23APR2023 01:31:45  18.0N   66.9W Md=3.3  EMSC   PUERTO RICO

O: 23APR2023 01:31:45  18.0N   66.9W Md=3.7  ANSS   PUERTO RICO

O: 22APR2023 11:53:08  18.0N   66.9W Md=3.7  EMSC   PUERTO RICO                  

O: 22APR2023 11:53:08  18.0N   66.9W Md=4.0  ANSS   PUERTO RICO                  

P: 21APR2023 152578    18.0N   66.0W 3.4-5.3 AAAAA  Puerto Rico                

 

NEIC reported these earthquakes of M 3.7 and M 4.0 in Southern Puerto Rico were felt with intensity II-III in the area(s) of Southern Puerto Rico in Ensenada, Guanica, San German, Mayaguez and Lares.

 

O: 22APR2023 19:19:38  18.1N   61.8W mb=4.4  EMSC   ANTIGUA AND BARBUDA REGION   

P: 29APR2023 152566    17.0N   60.0W 3.0-5.0 CBBAA  Leeward Islands            

 

NEIC reported this earthquake of M 4.4 in Antigua and Barbuda was felt with intensity II-III in the area(s) of Monkey Hill, Saint Peter Bassetere, Saint Kitts and Nevis.

 

O: 22APR2023 17:34:25  18.1N  103.3W ML=4.1  EMSC   OFFSHORE MICHOACAN, MEXICO   

P: 25APR2023 152571    18.0N  103.0W 3.5-5.5 BAAAA  Michoacan, Mexico          

 

O: 22APR2023 10:53:29  18.9N  107.3W ML=4.0  EMSC   OFF COAST OF JALISCO, MEXICO 

P: 16APR2023 152280    19.0N  107.0W 3.5-5.3 CAAAA  Coast of Jalisco, Mexico   

 

O: 23APR2023 05:01:43  19.1N   64.7W Md=3.4  EMSC   VIRGIN ISLANDS REGION         

P: 24APR2023 152582    20.0N   65.0W 3.0-5.0 AAAAA  Bahamas/No. Caribbean      

 

O: 23APR2023 03:48:55  19.2N   64.6W Md=3.5  EMSC   VIRGIN ISLANDS REGION        

P: 22APR2023 152582    20.0N   64.0W 3.0-4.8 AAAAA  Bahamas/No. Caribbean      

 

O: 22APR2023 15:29:40  19.2N   69.1W ML=4.2  EMSC   DOMINICAN REPUBLIC REGION    

P: 20APR2023 152304    20.0N   68.0W 3.0-4.9 AAAAA  Bahamas/No. Caribbean      

 

AFRICA AND EUROPE

 

O: 22APR2023 21:43:16  34.9N   14.1E ML=3.5  EMSC   CENTRAL MEDITERRANEAN SEA

O: 22APR2023 23:27:13  34.9N   14.1E ML=3.3  EMSC   CENTRAL MEDITERRANEAN SEA    

P: 22APR2023 152626    35.0N   14.0E 3.0-4.8 AAAAA  Mediterranean/Sicily       

 

O: 22APR2023 20:38:19  37.1N   28.5E ML=4.0  EMSC   WESTERN TURKEY               

O: 23APR2023 03:40:06  37.1N   28.5E mb=4.1  EMSC   WESTERN TURKEY               

P: 24APR2023 152659    38.0N   28.0E 3.5-5.2 AAAAA  Turkey                     

 

NEIC reported this earthquake of M 4.1 in Mugla, Western Turkey was felt with intensity IV in the area(s) of Mugla, Western Turkey in Ula and Koycegiz.

 

O: 22APR2023 08:38:04  38.2N   24.2E Mw=4.6  EMSC   AEGEAN SEA                   

P: 21APR2023 152601    37.0N   25.0E 3.0-4.9 ABAAA  Aegean Sea                 

 

NEIC reported this earthquake of M 4.6 in the Aegean Sea of Greece was felt with intensity II-III in the area(s) of the Aegean Sea of Greece in Attiki at Vrilissia, Limin, Kipseli, Athens, Kalamakion, Koridallos, Glifada and with IV in Andros, Greece.

 

SOUTHWEST PACIFIC

 

O: 23APR2023 02:28:41  20.8S  173.9W mb=5.1  EMSC   TONGA                        

P: 25APR2023 152756    19.0S  174.0W 4.0-5.4 ABAAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 22APR2023 10:36:35  27.4N   16.0W ML=2.5  EMSC   CANARY ISLANDS, SPAIN REGION

O: 23APR2023 02:45:57  27.7N   18.0W ML=2.4  EMSC   CANARY ISLANDS, SPAIN REGION 

P: 25APR2023 152586    28.0N   16.0W 3.0-4.7 AAAAA  Canary Islands             

 

O: 22APR2023 16:17:50  35.6S  104.0W ML=4.8  EMSC   SOUTHEAST OF EASTER ISLAND   

P: 14APR2023 152505    36.0S   97.0W 4.0-5.4 AAAAA  Chile Rise                 

 

 

ZEALANDIA AND AUSTRALIA REGION

 

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

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

 

JAPAN AND KURIL ISLANDS

 

O: 23APR2023 04:48:34  46.0N  150.9E mb=4.1  EMSC   KURIL ISLANDS                

P: 21APR2023 152700    47.0N  154.0E 3.5-5.4 AACAA  So. Kurils                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 22APR2023 08:58:52  31.7N  114.5W ML=3.4  EMSC   GULF OF CALIFORNIA

O: 22APR2023 08:04:08  31.1N  115.8W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO      

P: 22APR2023 152640    30.8N  115.8W 2.5-4.8 AAAAA  So. California             

 

O: 22APR2023 16:53:24  37.4N  120.0W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P: 23APR2023 152608    38.3N  119.3W 2.5-4.6 AAAAA  California/Nevada area     

 

O: 22APR2023 12:22:08  38.5N  119.6W Md=2.2  EMSC   CENTRAL CALIFORNIA           

P: 20APR2023 152324    38.3N  119.3W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 22APR2023 09:17:41  39.4N  120.4W Md=2.0  EMSC   NORTHERN CALIFORNIA          

P: 23APR2023 152615    39.8N  120.6W 2.5-4.6 AAAAA  Central California         

 

O: 22APR2023 14:10:48  40.3N  124.0W MD=2.1  EMSC   NORTHERN CALIFORNIA           

P: 22APR2023 152692    40.7N  124.6W 2.5-4.4 AAAAA  Off Coast of No. Calif     

 

ALASKA

 

O: 22APR2023 12:54:50  50.7N  174.4W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 22APR2023 152710    51.2N  174.4W 3.5-5.2 AAAAA  Andreanoff Isls, Aleutians 

 

O: 22APR2023 14:42:42  54.7N  156.9W ml=3.5  EMSC   SOUTH OF ALASKA

O: 23APR2023 05:10:24  54.7N  156.7W ML=4.0  EMSC   SOUTH OF ALASKA              

P: 14APR2023 152431    54.7N  156.9W 3.5-5.1 CAAAA  Alaska Peninsula           

 

O: 22APR2023 21:23:58  55.4N  157.2W mb=4.3  EMSC   ALASKA PENINSULA             

P: 17APR2023 152431    56.7N  157.9W 3.5-5.1 BBAAA  Alaska Peninsula           

 

O: 22APR2023 21:22:32  64.6N  149.8W ML=3.1  EMSC   CENTRAL ALASKA               

P: 23APR2023 152736    63.3N  147.5W 3.2-5.2 ABAAA  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

 

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

 

EASTERN U.S./CANADA

 

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

 

HAWAII

 

O: 23APR2023 03:19:22  19.1N  155.4W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 22APR2023 08:17:40  19.2N  155.5W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 23APR2023 00:23:47  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII     

O: 23APR2023 00:23:47  19.4N  155.3W ML=4.0  ANSS   ISLAND OF HAWAII, HAWAII     

P: 26APR2023 152588    19.3N  155.1W 4.0-5.8 BAAAA  Hawaii area                 

 

STRONG EARTHQUAKES OCCUR ALONG SOLAR ECLIPSE PATH

 

EARTHQUAKE SUMMARY FOR APRIL 21, 2023

 

A string of three strong earthquakes occurred today in central Indonesia along the path of the hybrid solar eclipse of April 20, 2023. These included an M 5.8 near the beginning of the eclipse in the South Indian Ocean; an M 6.4 in the Molucca Sea in Central Indonesia and a second event of M 6.4 in the Banda Sea of Indonesia. The event in the Banda Sea occurred near the point of maximum duration of the solar eclipse as reported in this and previous issues of this report:

 

"The new moon arrived on April 20, 2023 at 04:12 UT. This is an unusual hybrid solar eclipse. A hybrid solar eclipse occurs when the point of the umbra cone passes through the earth. This causes some locations to see a total eclipse and others to see an annular eclipse of the sun. Hybrid eclipses are very rare with the next such eclipse due in 2172. The greatest extent will occur at 9.5S 125.5E in the Banda Sea north of western Australia. The full eclipses will be visible in Central Indonesia and East Timor to western New Guinea. A major to large earthquake is likely in this area within days of the eclipse.  Longitudes which are  sub-solar at this hour are near 125E while those at local solar midnight are near 55W. These include in the east areas of Central and western Indonesia, Philippines, and eastern China and Asia and in the west, the eastern Caribbean and northern and western South America. These are the areas most likely to see tidal triggering in the next week. The eclipse begins in the South Indian Ocean and passes over near active seismic sites at 37S 97E and 33S 56E, near the antipode of southern California.  Other locations which could see seismic triggering with this eclipse include northern New Guinea at 0-3S 131-143E - an area which  currently active and could see further seismic enhancement  and some other areas where strong or unusual earthquakes occur and the likelihood of such an event, especially near 125E is considered highly likely in this time frame.  Recent examples of antipodal triggering suggest the antipode of this eclipse may also see enhanced seismicity at this time. The antipode begins off the coast of Northern and Southern Carolina extends into the Atlantic and ends in the central mid-Atlantic ridge, an active tectonic area where tectonic seismic enhancement is likely at this time. The other type of seismicity in this area has been proposed when clathrate deposits off eastern Carolinas erupt with changes in temperature or pressure.  These can lead to moderate earthquakes and there is a confirmed clathrate which has bee recovered in this area. Other clathrate hydrate deposits are known to exist in the northern Gulf of Mexico and near 30N 120W off southern California where an M 3.7 occurred two days ago. The next lunar eclipse will occur on May 5-6, 2023 with the next full moon and will be visible in the eastern hemisphere of the earth." (April 15-21, 2023)

 

It is highly likely that this and other earthquakes in this series were triggered by tidal stresses associated with the eclipse as expanded on in the previous issue of this summary:

 

"It was a relatively quiet day in global seismicity but this may not continue for long. Often after a major stress event such as this morning's solar eclipse stress is not immediately released in the form of earthquake but larger quakes along the eclipse path follow several days later. This is expected to be the case in the current situation especially in the area of Indonesia near 125-130 East ..." (April 20-21, 2023)

 

The M 5.8 in the mid-Indian Ocean today was the strongest within about 200 km  of this epicenter on October 4, 2013 (M 6.4) - which also occurred with the new moon - and as an M 6.0 on May 6, 2006. At the time of the M 6.4 of October 2013 this summary noted:

 

"A strong earthquake of M 6.4 hit near the triple junction in the mid-Indian Rise today. This is a remote area and there were no reported effects on human populations which are few in this oceanic region. This is the strongest earthquake to hit within 300 km of this epicenter in the past 25 years, so this is a significant regional event. The only earthquakes of M>=6 in the region occurred in May, 2006 (M 6-6.1); May 2002 (M 6.1-6.2) and August 1996 (M 6.0). A global seismic watch was in effect when the quake occurred as it was near local solar midnight at the time of occurrence, a time when tidal forces from the new moon were maximized. Seismicity in this area is generally related to magma intrusion along the ridge and magma is affected by tidal forces." (October 4, 2013)

 

Today's earthquake in the Mid-Indian Ridge occurred at an epicenter where the solar eclipse of April 20 was first visible and had been expected in the tidal forecast for this eclipse (see TIDAL section of this report). The antipode of this epicenter is in northern Oklahoma and southwestern Kansas. Some triggering by antipodal focusing may occur in this area. Forecast 152782 had expected today's event in the Indian Ocean was likely within about 200 km around April 23.

 

O: 21APR2023 09:06:33  38.6S   78.1E Mw=5.8  EMSC   MID-INDIAN RIDGE             

P: 23APR2023 152782    37.0S   79.0E 4.0-5.6 ABAAA  So. Indian Ocean           

 

Maximum duration of the total eclipse at this point in the Banda Sea where the

M 6.4 occurred today was about 1 minute 15 seconds within about 2 seconds of maximum duration of the total eclipse, so this is essentially the location of the maximum eclipse at 04:16 UT on April 20, 2023. BMG reported this earthquake was widely felt in the Banda Sea with intensity III in Wakatobi and Buru Selatan and II Alor, Flores, Timur, Muna, Buton, Konawe Selatan, Wakatobi, Konawe, Bau, Maluku, Seram, MAmbon and Sula.

 

In addition to being closely connected with the solar eclipse of April 20, this event may be a regional aftershock of the M 7.6 on January 9, 2023. That event occurred about 600 km southeast of today's epicenter. The last earthquake within about 250 km in the Banda Sea of M>=6.4 was an M 6.9 about 250  August 30, 2011. Forecasts 152254 and 152537 had expected today's activity in this area was likely  around April 17-22.

 

 

O: 22APR2023 08:23:44   5.2S  125.6E ML=6.4  BMG    BANDA   SEA                  

O: 22APR2023 09:15:55   5.3S  125.6E ML=5.5  BMG    BANDA   SEA                  

P: 17APR2023 152254     7.0S  123.0E 4.0-5.6 BBCAA  Flores Island area         

P: 22APR2023 152537     5.0S  126.0E 4.0-6.4 AAAAA  Ceram area                 

 

An M 5.0 also occurred north of this in the region of Kep Sula where BMG reported it was felt with intensity IV; III in Pulau Taliabu; and II in Buru, Buru Selatan and Halmahera Selatan. Forecast 152252 had expected this event within about 200 km was likely around April 20.

 

O: 22APR2023 10:15:18   2.1S  125.8E ML=5.0  BMG    KEP. SULA, INDONESIA         

P: 20APR2023 152252     1.0S  127.0E 4.0-5.4 ABBAA  Ceram area                 

 

The M 6.4 in the Molucca Sea of Indonesia today was also widely felt. BMG - the local Indonesian Seismic Network - reported this earthquake was widely felt in Halmahera ad Molucca with maximum intensity IV in Halmahera at Ibu and in Barat, Maluku. Intensity III was reported in Talaud and Sangihe  and in Siau, Pilai and Ternate and Halmahera with lesser shaking in Minahasa, Sangihe, Talaud and other areas. In addition to being promoted by tidal stresses from the solar eclipse, this may also be the strongest aftershock to date of the M 7.2 near this epicenter which occurred January 18, 2023. The only event within about 300 km of this epicenter - aside from the M 7.2 event on January 18, 2023 was an M 6.4 on

June 4, 2020.  Forecast 152239 had expected enhanced seismicity in this region was likely in mid-April, 2023.

 

O: 21APR2023 10:21:14   2.8N  127.1E ML=6.4  BMG    MOLUCCA SEA                  

O: 21APR2023 10:21:13   2.8N  127.1E Mw=5.9  EMSC   MOLUCCA SEA

O: 21APR2023 12:21:10   2.8N  127.2E mb=4.5  EMSC   MOLUCCA SEA

O: 21APR2023 11:15:59   2.9N  127.2E mb=4.7  EMSC   MOLUCCA SEA

O: 21APR2023 14:25:40   3.3N  126.5E ML=4.1  EMSC   KEPULAUAN TALAUD, INDONESIA

P: 13APR2023 152239     3.0N  128.0E 4.0-5.4 CAAAA  Halmahera                  

P: 17APR2023 152239     4.0N  129.0E 4.0-5.4 BBBAA  Halmahera                  

 

 

An earthquake of M 5.2 also occurred today in New Guinea. NEIC reported it was felt with intensity IV in New Guinea at Kainantu and III in Lae Morobe and Mount Hagen, PNG. Forecast 152259 had expected this earthquake within about 50 km was likely around April 18, 2023.

 

O: 21APR2023 15:02:57   6.3S  146.6E mb=5.2  EMSC   EASTERN NEW GUINEA REG., P.N.G

P: 18APR2023 152259     6.0S  146.0E 4.0-5.5 BAAAA  New Ireland                

 

 

A moderately strong earthquake also occurred today in Malta. NEIC reported maximum intensity V in Malta at Marsasacala, Gudja, Pieta, Floriana; IV in Qrendi and III in Fgura, Zueeieq and Isla. NEIC reported the mainshock at M 5.5 at 22:20 UT; the foreshock  of M 4.3  and 18:13 UT in the first several hours. The initial event in this series occurred and an aftershock  with M 3.2 at 01:56 UT - April 22. These precisely match the time of maximum output of the strong solar flares during this period as shown in the Flare table below and here:

 

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

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

 

6620       1744   1812      1844   M1.7      (April 21, 2023)   3.9E-02  

Malta M 4.3 18:13 UT

 

6650       2212   2223      2230   C4.0      (April 21, 2023)   2.8E-03  

Malta M 5.5 22:19 UT

 

XXXX       0148   0152      0214   C6.0      (April 22, 2023)   1.0E-04  

Malta M 3.3 01:52 UT

 

It is likely that this series in Malta was triggered by Solar Flare Effects (SFE) with these flares. The M1.7 flare (#6620) is the strongest observed solar  since #2990 on April 10, 2023 (M2.9) and an M2.9 on April 8, 2023 (#2530). The last flares of significantly larger output occurred on March 29, 2023 with  M5.4 and X1.2. The precise tracking with the maximum flare output today suggests that flares are an important trigger in the region of Malta. This had been suggested in this summary when the current series started in Malta on January 18 as:

 

 

"An earthquake of M 5.0 occurred near Malta in the Central Mediterranean today. NEIC reported it was felt with intensity I-II in Malta at Floriana and Ta Xbiex, Inner Harbour and San Pawl il-Bahar. A foreshock of M 4.2 was felt with intensity III in Mellieha, Northern Malta. This earthquake occurred simultaneously with a C3.0 solar flare which began at the time of the M 5.0 in Malta. This earthquake of M 5.0 is the strongest within about 150 km of this epicenter in the past 30 years. An M 5.3 occurred about 200 km west of this on September 10, 1993 and near this epicenter with M 5.3 on September 29, 1992. The epicenter was within minutes of local solar midnight when the M1.8 class solar flare began (#1310) and was probably promoted by SFE associated with that flare which maximize at this hour" (January 18, 2023)

 

Today's earthquake of M 5.5 in Malta is the strongest in the current series.

It is also the strongest earthquake in the area of Malta in at least 35 years.

No earthquakes of significantly larger magnitude have been recorded in Malta area in historic times. Earthquakes of M 5.5 were recorded in the area on May 10, 1961, December 13, 1929 and September 18, 1923. Forecast 152626 had expected continuing activity in the region of Malta was likely around April 22, 2023.

This activity is located near 103 degrees from the M 7.0 in Java of April 14, 2023 and may have been promoted by energy from that source.

 

O: 22APR2023 01:55:57  34.7N   14.9E ML=3.2  EMSC   CENTRAL MEDITERRANEAN SEA

O: 21APR2023 18:13:18  34.8N   15.0E ML=4.3  EMSC   CENTRAL MEDITERRANEAN SEA

O: 21APR2023 22:19:48  35.0N   15.3E Mw=5.5  EMSC   CENTRAL MEDITERRANEAN SEA

O: 22APR2023 04:42:44  34.6N   14.9E ML=3.9  EMSC   CENTRAL MEDITERRANEAN SEA    

P: 22APR2023 152626    35.0N   14.0E 3.0-4.8 AAAAA  Mediterranean/Sicily       

 

The earthquakes in Malta today were preceded by an M 4.4 in Sicily, Italy. NEIC reported this earthquake of M 4.1 in Sicily, Italy was felt with intensity II-III in the area(s) of  Sicily, Italy with intensity IV in Aci, Castello, Catena, Acireale, Catania, Sant'Agatl il Battiti, Santa Venerina and Motta  ant'Anastasia and III in Gravina di Catania. This event occurred near local solar noon and may have been promoted by high tidal stresses. Earthquakes of M 4.4-4.5 or greater have most recently occurred on February 20, 2023 and December 4, 2022 both with M 4.4. No earthquakes of significantly larger magnitude have occurred in Sicily in at least three years. Forecast 152339 had expected today's event in Sicily within about 50 km was likely around April 18, 2023.

 

O: 21APR2023 12:06:24  37.5N   15.4E ML=4.4  EMSC   SICILY, ITALY                

P: 18APR2023 152339    38.0N   15.0E 3.0-4.9 BAAAA  Mediterranean/Sicily       

 

An earthquake of M 4.6 was also felt in Guam today. NEIC reported it was felt with intensity IV in Guam at Yona and III in Mangilao, Sinajana, Mongmong, Tamuning, Piti, Yigo and Dededo. This event may have been promoted by stresses associated with Tropical Depression 01W which was bearing down on Guam when this event occurred as noted in previous issues of this summary:

 

 

"TD 01W continued today in the area East of Guam with winds up to 35 kts.  It is expected to track to the northwest and may influence regional seismicity in Guam at this time." (April 21, 2023)

 

Forecasts 152301 and 152580 had expected today's event in Guam wa likely

around April 15-23, 2023.

 

O: 21APR2023 13:18:18  13.3N  145.0E mb=4.6  EMSC   GUAM REGION                   

P: 15APR2023 152301    13.0N  145.0E 4.0-5.4 CAAAA  So. Marianas/Guam          

P: 23APR2023 152580    13.0N  144.0E 4.0-5.4 AAAAA  So. Marianas/Guam          

 

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

Andreanof Islands, Aleutians, Alaska. NEIC reported it was felt with intensity II in Adak, Alaska. An M 4.7-4.8 hit south of this epicenter on April 8, 2023. At the time this summary noted in this regard:

 

"The last earthquake within about 150 km of this epicenter in the Andreanof Islands with M>=4.8 was an M 4.8 on December 5, 2022 but the last of larger magnitude was an M 5.1 on November 6, 2022." (April 8, 2023)

 

Forecasts 152434 and 152708 had expected today's activity was likely around April 19-23 within about 100 km of this epicenter.

 

O: 21APR2023 18:17:10  52.5N  175.9W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 19APR2023 152434    51.9N  174.0W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

P: 23APR2023 152708    51.3N  176.8W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

Moderate seismicity also continued today in the northeastern Caribbean. NEIC reported an event of M 4.4 was felt with intensity II in Santo Domingo, Dominican Republic. Forecast 152304 had expected today's activity within about 150 km was likely around April 20, 2023.

 

O: 21APR2023 12:24:37  19.2N   69.1W mb=4.4  EMSC   DOMINICAN REPUBLIC REGION

O: 21APR2023 12:58:53  19.1N   69.0W ML=3.1  EMSC   DOMINICAN REPUBLIC REGION    

O: 21APR2023 10:14:33  19.2N   67.3W ML=3.0  EMSC   PUERTO RICO REGION           

P: 20APR2023 152304    20.0N   68.0W 3.0-4.9 AAAAA  Bahamas/No. Caribbean      

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 7.0 in the area of Java April 14, 2023, where promoted seismicity is considered likely.

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

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

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

 

ASIA

 

O: 21APR2023 11:44:44  23.5N  121.5E ML=4.5  TAI    Hualien, Taiwan              

P: 18APR2023 152315    24.0N  123.0E 4.0-5.4 BAAAA  Taiwan                     

 

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

NEIC reported this earthquake of M 4.6 east of Taiwan  was felt with intensity II-III in the area(s) of  Pingshan, Guangdong, Taiwan.

 

O: 22APR2023 05:04:23  22.6N  118.5E mb=4.6  EMSC   TAIWAN REGION                

P: 13APR2023 152315    22.0N  121.0E 4.0-5.4 CABAA  Taiwan                     

 

O: 21APR2023 17:14:12  51.9N  159.3E mb=4.0  EMSC   OFF EAST COAST OF KAMCHATKA  

O: 21APR2023 22:07:39  52.1N  159.5E mb=4.0  EMSC   OFF EAST COAST OF KAMCHATKA

P: 16APR2023 152442    52.0N  159.0E 4.0-6.0 BAAAA  Kamchatka                  

P: 21APR2023 152718    52.0N  158.0E 4.0-6.0 AAAAA  Kamchatka                  

 

O: 21APR2023 15:22:45  52.8N  158.3E ML=4.2  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 20APR2023 152442    53.0N  158.0E 4.0-6.2 AAAAA  Kamchatka                  

 

INDONESIA AND PHILIPPINES

 

O: 21APR2023 10:21:13   2.8N  127.1E Mw=5.9  EMSC   MOLUCCA SEA

O: 21APR2023 12:21:10   2.8N  127.2E mb=4.5  EMSC   MOLUCCA SEA

O: 21APR2023 11:15:59   2.9N  127.2E mb=4.7  EMSC   MOLUCCA SEA

O: 21APR2023 14:25:40   3.3N  126.5E ML=4.1  EMSC   KEPULAUAN TALAUD, INDONESIA

O: 21APR2023 10:21:14   2.8N  127.1E ML=6.4  BMG    MOLUCCA SEA                  

P: 13APR2023 152239     3.0N  128.0E 4.0-5.4 CAAAA  Halmahera                  

P: 17APR2023 152239     4.0N  129.0E 4.0-5.4 BBBAA  Halmahera                  

 

O: 22APR2023 10:15:18   2.1S  125.8E ML=5.0  BMG    KEP. SULA, INDONESIA         

P: 20APR2023 152252     1.0S  127.0E 4.0-5.4 ABBAA  Ceram area                 

 

O: 21APR2023 17:44:14   5.2S  102.5E ML=4.7  EMSC   SOUTHERN SUMATRA, INDONESIA  

P: 19APR2023 152268     4.0S  102.0E 4.0-5.4 ABAAA  So. of Sumatera            

 

O: 22APR2023 08:23:44   5.2S  125.6E ML=6.4  BMG    BANDA   SEA                  

O: 22APR2023 09:15:55   5.3S  125.6E ML=5.5  BMG    BANDA   SEA                  

P: 17APR2023 152254     7.0S  123.0E 4.0-5.6 BBCAA  Flores Island area         

P: 22APR2023 152537     5.0S  126.0E 4.0-6.4 AAAAA  Ceram area                 

 

O: 21APR2023 15:02:57   6.3S  146.6E mb=5.2  EMSC   EASTERN NEW GUINEA REG., P.N.G

P: 18APR2023 152259     6.0S  146.0E 4.0-5.5 BAAAA  New Ireland                

 

O: 22APR2023 01:06:06   9.8N  126.2E mb=4.9  EMSC   MINDANAO, PHILIPPINES        

P: 19APR2023 152287    10.0N  126.0E 3.5-5.2 BAAAA  Luzon, Philippines         

P: 21APR2023 152567    10.0N  125.0E 3.5-4.9 AAAAA  Luzon, Philippines         

P: 22APR2023 152522     9.0N  126.0E 4.0-5.6 AAAAA  Central Philippines        

 

NEIC reported this earthquake of M 4.9 in Mindanao, Philippines was felt with intensity II-III in the area(s) of Mindanao, Philippines in Sapao, Caraga.

 

O: 21APR2023 13:18:18  13.3N  145.0E mb=4.6  EMSC   GUAM REGION                  

P: 15APR2023 152301    13.0N  145.0E 4.0-5.4 CAAAA  So. Marianas/Guam          

P: 23APR2023 152580    13.0N  144.0E 4.0-5.4 AAAAA  So. Marianas/Guam          

 

 

CENTRAL AND SOUTH AMERICA

 

O: 21APR2023 23:10:40   5.1S   77.4W mb=5.3  EMSC   NORTHERN PERU                

P: 20APR2023 152262     6.0S   76.0W 4.0-5.5 AABAA  No. Peru                   

 

O: 21APR2023 23:12:10   9.6N   78.2W ML=4.1  EMSC   PANAMA                        

P: 18APR2023 152236     7.0N   78.0W 4.0-5.7 BCAAA  Colombia                   

 

O: 21APR2023 07:15:33  13.3N   89.8W ML=4.1  EMSC   OFFSHORE EL SALVADOR         

O: 21APR2023 07:02:33  13.4N   89.8W mb=4.0  EMSC   OFFSHORE EL SALVADOR          

P: 19APR2023 152282    13.0N   90.0W 3.5-5.1 AAAAA  Guatemala                  

 

O: 22APR2023 02:22:56  14.8S   74.0W ML=4.0  EMSC   CENTRAL PERU                 

P: 21APR2023 152745    14.0S   73.0W 4.0-5.6 AAAAA  Central Peru               

 

O: 21APR2023 09:55:26  15.9N   96.3W ML=4.3  EMSC   OAXACA, MEXICO               

P: 18APR2023 152297    17.0N   96.0W 3.5-5.3 BBAAA  Oaxaca, Mexico             

 

O: 22APR2023 04:08:47  16.3N   99.7W ML=4.2  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 19APR2023 152296    18.0N  100.0W 3.5-5.6 ABAAA  Oaxaca, Mexico             

P: 23APR2023 152577    16.0N   99.0W 3.5-5.4 AAAAA  Oaxaca, Mexico             

 

O: 21APR2023 23:02:40  17.2N   94.4W ML=4.1  EMSC   VERACRUZ, MEXICO

O: 21APR2023 11:16:35  16.5N   95.1W ML=4.0  EMSC   OAXACA, MEXICO               

P: 18APR2023 152297    17.0N   96.0W 3.5-5.3 BAAAA  Oaxaca, Mexico             

 

O: 22APR2023 03:31:04  18.6N  106.3W ML=4.1  EMSC   OFF COAST OF JALISCO, MEXICO 

P: 20APR2023 152291    19.0N  105.0W 3.5-5.6 AAAAA  Michoacan, Mexico          

 

 

O: 21APR2023 12:24:37  19.2N   69.1W mb=4.4  EMSC   DOMINICAN REPUBLIC REGION

O: 21APR2023 12:58:53  19.1N   69.0W ML=3.1  EMSC   DOMINICAN REPUBLIC REGION    

O: 21APR2023 10:14:33  19.2N   67.3W ML=3.0  EMSC   PUERTO RICO REGION           

P: 20APR2023 152304    20.0N   68.0W 3.0-4.9 AAAAA  Bahamas/No. Caribbean      

 

O: 21APR2023 22:33:57  19.5N   65.4W Md=3.4  EMSC   PUERTO RICO REGION           

P: 18APR2023 152303    20.0N   65.0W 3.0-5.1 BAAAA  Bahamas/No. Caribbean      

P: 22APR2023 152578    19.0N   66.0W 3.4-5.3 AAAAA  Puerto Rico                

 

O: 21APR2023 22:41:39  19.5N  108.5W ML=4.0  EMSC   REVILLA GIGEDO ISLANDS REGION

P: 16APR2023 152280    19.0N  107.0W 3.5-5.3 BABAA  Coast of Jalisco, Mexico   

 

O: 21APR2023 11:53:08  22.8S   68.7W mb=4.2  EMSC   ANTOFAGASTA, CHILE           

P: 17APR2023 152490    22.0S   69.0W 4.0-5.9 BAAAA  Coast No. Chile            

 

 

AFRICA AND EUROPE

 

O: 22APR2023 01:55:57  34.7N   14.9E ML=3.2  EMSC   CENTRAL MEDITERRANEAN SEA

O: 21APR2023 18:13:18  34.8N   15.0E ML=4.3  EMSC   CENTRAL MEDITERRANEAN SEA

O: 21APR2023 22:19:48  35.0N   15.3E Mw=5.5  EMSC   CENTRAL MEDITERRANEAN SEA

O: 22APR2023 04:42:44  34.6N   14.9E ML=3.9  EMSC   CENTRAL MEDITERRANEAN SEA    

P: 22APR2023 152626    35.0N   14.0E 3.0-4.8 AAAAA  Mediterranean/Sicily       

 

O: 21APR2023 12:06:24  37.5N   15.4E ML=4.4  EMSC   SICILY, ITALY                

P: 18APR2023 152339    38.0N   15.0E 3.0-4.9 BAAAA  Mediterranean/Sicily       

 

SOUTHWEST PACIFIC

 

O: 21APR2023 12:39:06  16.3S  175.9W mb=4.5  EMSC   TONGA                        

P: 12APR2023 152481    16.0S  176.0W 4.0-5.6 CAAAA  Tonga Islands              

P: 18APR2023 152475    15.0S  177.0W 4.0-5.5 BAAAA  Samoa Islands              

P: 21APR2023 152749    15.0S  175.0W 4.0-5.6 ABAAA  Samoa Islands              

 

O: 22APR2023 06:05:14  22.3S  179.6W mb=4.6  EMSC   SOUTH OF FIJI ISLANDS        

P: 19APR2023 152499    24.0S  178.0W 4.0-5.5 BBBAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 21APR2023 17:05:55  28.1N   16.1W ML=2.4  EMSC   CANARY ISLANDS, SPAIN REGION 

P: 25APR2023 152586    28.0N   16.0W 3.0-4.7 BAAAA  Canary Islands             

 

O: 21APR2023 09:06:33  38.6S   78.1E Mw=5.8  EMSC   MID-INDIAN RIDGE             

P: 23APR2023 152782    37.0S   79.0E 4.0-5.6 ABAAA  So. Indian Ocean           

 

 

ZEALANDIA AND AUSTRALIA REGION

 

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

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

 

JAPAN AND KURIL ISLANDS

 

O: 21APR2023 21:10:46  24.0N  123.5E Mw=4.2  EMSC   SOUTHWESTERN RYUKYU ISL., JAPAN

O: 21APR2023 16:09:55  25.0N  123.5E mb=4.5  EMSC   SOUTHWESTERN RYUKYU ISL., JAPA

P: 18APR2023 152315    24.0N  123.0E 4.0-5.4 BAAAA  Taiwan                      

 

 

O: 22APR2023 01:41:30  37.2N  141.4E ML=4.2  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 17APR2023 152350    37.0N  141.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

P: 23APR2023 152636    37.0N  142.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

O: 21APR2023 12:43:30  40.3N  142.5E ML=3.9  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 18APR2023 152393    41.0N  142.0E 3.5-5.6 BAAAA  Hokkaido, Japan            

 

O: 22APR2023 01:33:38  30.6N  132.5E mb=4.8  EMSC   SOUTHEAST OF SHIKOKU, JAPAN

O: 21APR2023 07:38:22  30.7N  132.4E mb=4.5  EMSC   SOUTHEAST OF SHIKOKU, JAPAN

O: 21APR2023 23:47:03  30.7N  132.4E mb=4.6  EMSC   SOUTHEAST OF SHIKOKU, JAPAN

O: 22APR2023 01:00:43  30.6N  132.4E mb=4.8  EMSC   SOUTHEAST OF SHIKOKU, JAPAN  

P: 13APR2023 152338    31.0N  132.0E 3.5-4.9 CAAAA  Kyushu, Japan area         

P: 22APR2023 152625    32.0N  132.0E 3.5-4.9 ABAAA  Kyushu, Japan area         

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 21APR2023 09:32:46  30.6N  114.3W ML=3.5  EMSC   GULF OF CALIFORNIA           

O: 21APR2023 10:22:14  30.8N  116.3W ML=3.6  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O: 21APR2023 10:48:29  31.1N  115.8W ML=3.6  EMSC   BAJA CALIFORNIA, MEXICO

O: 21APR2023 20:07:34  31.2N  115.8W ML=3.1  EMSC   BAJA CALIFORNIA, MEXICO

O: 21APR2023 07:37:02  31.1N  115.8W ML=3.6  EMSC   BAJA CALIFORNIA, MEXICO      

P: 22APR2023 152640    30.8N  115.8W 2.5-4.8 AAAAA  So. California             

 

O: 22APR2023 02:04:33  36.7N  121.3W ML=2.7  EMSC   CENTRAL CALIFORNIA           

O: 22APR2023 02:04:33  36.7N  121.3W ML=2.9  ANSS   CENTRAL CALIFORNIA           

O: 21APR2023 09:13:56  36.9N  121.5W ML=3.0  EMSC   CENTRAL CALIFORNIA

O: 21APR2023 09:13:56  36.9N  121.5W ML=3.2  ANSS   CENTRAL CALIFORNIA

P: 18APR2023 152326    36.6N  120.7W 2.5-4.6 BAAAA  Central California         

P: 21APR2023 152609    36.2N  120.8W 2.5-4.6 AAAAA  Central California         

 

 

NEIC reported the earthquake of M 2.9 in Central California was felt with intensity II-III in the area(s) of Central California in Hollister and Paicines.

NEIC reported the earthquake of M 3.2 in Central California was felt with intensity II-III in the area(s) of Central California in San Juan Bautista, Gilroy, Hollister, Morgan Hill, Salinas, Los Banos and San Jose.

 

O: 22APR2023 01:04:30  38.2N  117.8W ml=2.2  EMSC   NEVADA                       

O: 21APR2023 11:49:12  38.2N  117.9W ml=2.0  EMSC   NEVADA                       

P: 18APR2023 152325    38.6N  118.6W 2.5-4.8 BAAAA  California/Nevada area     

 

O: 21APR2023 16:50:38  39.1N  122.3W Md=2.4  EMSC   NORTHERN CALIFORNIA          

P: 19APR2023 152412    40.4N  122.2W 2.5-4.5 ABAAA  Northern California        

 

ALASKA

 

O: 21APR2023 15:26:28  51.5N  176.5E ML=3.5  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 20APR2023 152450    51.0N  176.0E 4.0-5.9 AAAAA  Rat Islands                

 

O: 21APR2023 18:17:10  52.5N  175.9W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 19APR2023 152434    51.9N  174.0W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

P: 23APR2023 152708    51.3N  176.8W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 21APR2023 22:20:49  44.1N  126.0W ML=3.2  EMSC   OFF COAST OF OREGON          

P: 19APR2023 152415    43.1N  126.5W 3.0-4.8 AAAAA  Off Coast of Oregon        

 

ROCKY MOUNTAINS REGION

 

O: 21APR2023 14:56:32  31.5N  104.2W ML=2.6  EMSC   WESTERN TEXAS

O: 21APR2023 09:43:10  31.6N  104.0W ML=2.5  EMSC   WESTERN TEXAS

O: 21APR2023 16:03:44  31.6N  104.2W ML=2.2  EMSC   WESTERN TEXAS

O: 21APR2023 16:10:31  31.6N  104.2W ML=2.4  EMSC   WESTERN TEXAS

O: 21APR2023 10:41:30  31.5N  104.2W ML=2.3  EMSC   WESTERN TEXAS                

P: 17APR2023 152357    31.7N  104.3W 2.0-4.1 BAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 21APR2023 15:00:27  36.0N   84.7W mb=2.0  EMSC   EASTERN TENNESSEE            

P: 20APR2023 152373    34.0N   85.0W 2.0-4.4 ABAAA  Southeast U.S.             

P: 24APR2023 152624    35.0N   84.0W 2.0-4.3 BAAAA  Kentucky/Tennessee/NC      

 

O: 21APR2023 18:45:13  47.4N   70.1W MB=1.2  ECAN of La Pocati├¿re, QC           

P: 17APR2023 152406    47.3N   69.5W 2.0-4.5 BAAAA  New England                

P: 22APR2023 152685    47.3N   70.5W 2.0-4.4 AAAAA  New England                

 

O: 21APR2023 06:02:17  49.2N   66.8W MB=3.3  ECAN of Cap-Chat, QC                

P: 16APR2023 152399    49.3N   67.5W 2.0-4.4 BAAAA  Maine                      

 

O: 21APR2023 01:10:29  46.4N   75.9W MB=1.9  ECAN of Maniwaki, QC                

O: 20APR2023 19:44:10  46.7N   76.1W MB=2.1  ECAN of Grand-Remous, QC             

P: 19APR2023 152408    47.0N   76.0W 2.0-4.2 AAAAA  New York State             

 

O: 20APR2023 10:30:47  49.3N   65.9W MB=2.6  ECAN of Saint-Maxime-du-Mont-Louis, Q

P: 16APR2023 152399    49.3N   67.5W 2.0-4.4 BAAAA  Maine                      

 

O: 20APR2023 07:38:39  52.1N   91.8W MB=1.6  ECAN of Cat Lake, ON                

 

HAWAII

 

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

 

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