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.
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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.
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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)
#-----
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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 Péribonka, 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 Méchins, 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 Pocatière, 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 Pocatière, 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 Pocatière, 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 Québec, 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 Pocatière, 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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