Previous two summaries

MODERATE AFTERSHOCK SHAKES NORTHERN CALIFORNIA

EARTHQUAKE SUMMARY FOR MAY 12, 2023

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

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

...

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

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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 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)

"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 projected seismicity map follows for the coming week.

OTHER GLOBAL EARTHQUAKE ACTIVITY

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

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 projected seismicity map follows for the coming week.

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

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

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

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

INDONESIA AND PHILIPPINES

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

CENTRAL AND SOUTH AMERICA

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

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

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

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

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

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

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

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

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

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

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

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

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

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

AFRICA AND EUROPE

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

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

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

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

SOUTHWEST PACIFIC

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

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

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

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

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

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

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

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

OCEAN RIDGES

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

ZEALANDIA AND AUSTRALIA REGION

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

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

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

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

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

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

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

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

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

JAPAN AND KURIL ISLANDS

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

ALASKA

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

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

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

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

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

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

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

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

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

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

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

P: 3MAY2023 153010 61.3N 152.3W 3.2-5.1 AAAAA Central Alaska

NEIC reported this earthquake of M 3.0 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska in Anchorage (IV), Eagle River and Girdwood.

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

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

ROCKY MOUNTAINS REGION

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

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

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

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

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

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

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

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

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

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

EASTERN U.S./CANADA

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

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

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

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

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

NEIC reported this earthquake of M 2.7 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma in Duncan, Marlow and Norman.

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

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

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

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

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

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

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

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

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

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

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

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

HAWAII

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

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

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

STRONG QUAKE SHAKES WESTERN JAPAN; VOLCANOES ACTIVE WITH FULL MOON

EARTHQUAKE SUMMARY FOR MAY 4, 2023

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

"The 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 projected seismicity map follows for the coming week.

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

INDONESIA AND PHILIPPINES

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

CENTRAL AND SOUTH AMERICA

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

AFRICA AND EUROPE

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

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

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

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

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

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

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

SOUTHWEST PACIFIC

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

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

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

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

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

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

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

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

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

OCEAN RIDGES

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

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

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

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

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

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

ZEALANDIA AND AUSTRALIA REGION

O: 4MAY2023 08:40:30 29.7S 177.0W mb=4.8 EMSC KERMADEC ISLANDS, NEW ZEALAND

P: 2MAY2023 153059 30.0S 177.0W 4.0-5.4 AAAAA No. Kermadec Islands

P: 6MAY2023 153044 29.0S 178.0W 4.0-5.5 AAAAA No. Kermadec Islands

JAPAN AND KURIL ISLANDS

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

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

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

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

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 04MAY2023 21:38:57 31.3N 115.2W ML=3.3 EMSC BAJA CALIFORNIA, MEXICO

O: 4MAY2023 20:13:09 31.1N 115.4W ML=3.1 EMSC BAJA CALIFORNIA, MEXICO

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

O: 4MAY2023 17:35:49 32.7N 115.5W Ml=2.0 EMSC MEXICALI-CALEXICO AREA, CALIF.

P: 2MAY2023 152918 32.7N 115.4W 2.5-4.7 AAAAA So. California

O: 4MAY2023 18:21:33 34.9N 116.4W Ml=2.4 EMSC SOUTHERN CALIFORNIA

P: 4MAY2023 152925 35.1N 117.0W 2.5-4.9 AAAAA So. California

P: 9MAY2023 152924 34.6N 116.7W 2.5-4.8 BAAAA So. California

O: 4MAY2023 13:05:01 36.1N 117.8W Ml=2.0 EMSC CENTRAL CALIFORNIA

P: 4MAY2023 152925 35.4N 117.7W 2.5-4.6 AAAAA So. California

O: 4MAY2023 19:45:32 36.3N 120.9W Md=2.0 EMSC CENTRAL CALIFORNIA

P: 2MAY2023 152913 35.8N 121.3W 2.5-4.4 AAAAA Off So. California

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

O: 4MAY2023 07:57:49 37.5N 117.9W Md=2.1 EMSC CENTRAL CALIFORNIA

P: 2MAY2023 152880 37.1N 117.8W 2.5-4.6 AAAAA California/Nevada area

O: 4MAY2023 08:40:04 39.6N 122.0W Md=2.3 EMSC NORTHERN CALIFORNIA

P: 3MAY2023 152889 39.6N 123.4W 2.5-4.9 AABAA Central California

O: 4MAY2023 11:35:22 39.9N 123.6W Md=2.1 EMSC NORTHERN CALIFORNIA

O: 04MAY2023 17:29:24 39.9N 123.6W Md=2.1 EMSC NORTHERN CALIFORNIA

P: 3MAY2023 152889 39.6N 123.4W 2.5-4.9 AAAAA Central California

P: 6MAY2023 152966 40.0N 123.0W 2.5-4.8 AAAAA Northern California

ALASKA

O: 4MAY2023 09:40:03 51.2N 179.2W ml=3.2 EMSC ANDREANOF ISLANDS, ALEUTIAN IS

P: 7MAY2023 152984 50.8N 179.5W 3.5-4.9 BAAAA Andreanoff Isls, Aleutians

O: 4MAY2023 19:09:56 51.4N 177.2W ml=3.4 EMSC ANDREANOF ISLANDS, ALEUTIAN IS

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

O: 4MAY2023 08:02:11 54.1N 162.8W mb=4.0 EMSC ALASKA PENINSULA

P: 2MAY2023 153004 54.5N 161.8W 3.5-5.3 AAAAA Unimak Islands, Aleutians

NEIC reported an earthquake of M 3.0 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska in Wasilla, Talkeetna, Willow, Palmer.

O: 4MAY2023 19:17:16 67.6N 166.6W ml=3.7 EMSC BERING STRAIT

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

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

ROCKY MOUNTAINS REGION

O: 04MAY2023 07:56:11 32.2N 103.1W ML=2.6 EMSC NEW MEXICO

O: 4MAY2023 19:07:03 31.6N 104.2W ML=2.0 EMSC WESTERN TEXAS

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

O: 5MAY2023 03:18:13 32.0N 102.1W mb=2.5 EMSC WESTERN TEXAS

P: 6MAY2023 152915 32.5N 101.6W 2.0-4.1 AAAAA SW U.S.A

NEIC reported this earthquake of M 2.5 in Western Texas was felt with intensity II-III in the area(s) of Western Texas in Odessa.

EASTERN U.S./CANADA

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

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

O: 05MAY2023 01:24:18 29.1N 97.8W mb=2.5 EMSC SOUTHERN TEXAS

O: 05MAY2023 02:13:17 29.2N 97.8W mb=2.5 EMSC SOUTHERN TEXAS

O: 4MAY2023 13:50:14 29.1N 97.7W ML=2.5 EMSC SOUTHERN TEXAS

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

O: 04MAY2023 09:17:41 34.5N 97.2W ML=2.1 EMSC OKLAHOMA

O: 5MAY2023 06:36:23 34.5N 97.7W ML=2.4 EMSC OKLAHOMA

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

NEIC reported this earthquake of M 2.7 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma in Minco (V), Anadarko (IV), Pocasset, Binger and Ponca City.

HAWAII

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

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

QUIET SEISMICITY MAY BE INTERRUPTED WITH LUNAR ECLIPSE

EARTHQUAKE SUMMARY FOR MAY 3, 2023

Global seismicity was again at relatively quiet levels today. Earthquakes of M>=5 occurred today in the Kermadec Islands, New Zealand (M 5.0); the Southern East Pacific Rise (M 5.3); Afghanistan (M 5.3); Sichuan, China (M 5.0); and northern Luzon, Philippines (M 5.4).

The earthquake in Luzon, Philippines follows a similar event yesterday in that region. NEIC reported this earthquake of M 5.4 in Luzon, Philippines was felt with intensity II-III in the area(s) of Luzon, Philippines in Tuguegarao, Cagayan Valley (IV) and Baguio, Cordillera. Forecast 152841 had expected enhanced activity in Luzon was likely around May 2, 2023.

NEIC reported this earthquake of M 5.4 in Luzon, Philippines was felt with intensity II-III in the area(s) of Luzon, Philippines in Tuguegarao, Cagayan Valley (IV) and Baguio, Cordillera.

O: 04MAY2023 01:22:04 17.6N 122.4E mb=4.9 EMSC LUZON, PHILIPPINES

O: 04MAY2023 05:56:15 17.6N 122.2E mb=4.8 EMSC LUZON, PHILIPPINES

O: 4MAY2023 00:49:05 17.5N 122.4E Mw=5.4 EMSC LUZON, PHILIPPINES

P: 2MAY2023 152841 13.0N 122.0E 3.5-4.9 ACAAA Luzon, Philippines

The earthquake of M 5.3 in the Southern East Pacific Rise was not reported felt in this remote area. It is the strongest event within about 250 km of this epicenter since an M 5.9 on September 7, 2022 and prior to that an M 5.4 on

June 30, 2018.

O: 3MAY2023 23:25:50 53.1S 118.2W mb=5.3 EMSC SOUTHERN EAST PACIFIC RISE

The earthquake in Sichuan follows similar activity yesterday which had been discussed in this summary as:

"A pair of moderate earthquake of M 4.6 and 4.9 occurred later in the day in China near the Sichuan-Guizhou border region. Forecast 152593 had expected this activity in late April." (May 3, 2023)

NEIC reported today's earthquake of M 5.0 in Sichuan-Guizhou, China was felt with intensity II-III in the area(s) of Sichuan-Guizhou, China in Luzhou.

O: 4MAY2023 02:15:32 28.2N 105.3E mb=5.0 EMSC SICHUAN-GUIZHOU BORDER RG, CHI

P: 6MAY2023 152868 27.0N 97.0E 4.0-5.4 ABCAA Myanmar

The M 5.3 in Afghanistan had been expected in forecast 152895 within about 100 km around May 6, 2023. NEIC reported this earthquake of M 5.3 in Hindu Kush, Afghanistan was felt with intensity II-III in the area(s) of Hindu Kush, Afghanistan in Kabul and in Tashkent, Uzbekistan.

O: 3MAY2023 09:51:19 36.6N 70.7E Mw=5.3 EMSC HINDU KUSH REGION, AFGHANISTAN

P: 6MAY2023 152895 36.0N 70.0E 3.8-5.5 BAAAA Hindu Kush/Pakistan

This quiet period follows an active period of enhanced seismicity with the Solar Eclipse of April 20. Enhancement by tidal effects with that eclipse probably helped to alleviate seismic stresses leading to the current period of inactive seismicity. This may change in the next several days as the lunar eclipse of May 5, 2023 approaches. Large earthquakes tend to over-reach the available seismic stress as inertia of the earth pushes faults more than the release of seismic strain would normally do. This means that areas which were active in the last active period are due for corrective seismicity. Most of this occurred in the area of Indonesia during late April, so it is not unreasonable to see enhanced seismicity in that area with this full moon, but at considerably less amplitude than with the solar eclipse. This summary had noted the tidal seismicity expected with the current full moon in this and previous issues of this summary as:

The 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 projected seismicity map follows for the coming week.

OTHER GLOBAL EARTHQUAKE ACTIVITY

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 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: 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 projected seismicity map follows for the coming week.

OTHER GLOBAL EARTHQUAKE ACTIVITY

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: 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 projected seismicity map follows for the coming week.

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 2MAY2023 04:46:22 41.7N 71.6E mb=4.7 EMSC KYRGYZSTAN

P: 4MAY2023 152955 41.0N 73.0E 4.0-5.6 AAAAA Kirgizstan/Xinjiang

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

INDONESIA AND PHILIPPINES

O: 2MAY2023 01:21:43 0.5S 132.5E mb=4.7 EMSC NEAR N COAST OF PAPUA, INDONES

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

O: 2MAY2023 01:07:06 5.0N 126.3E ML=4.2 EMSC MINDANAO, PHILIPPINES

P: 2MAY2023 152799 4.0N 126.0E 4.0-5.5 AAAAA Mindanao, Philippines

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

O: 1MAY2023 07:47:32 6.2S 130.3E ML=4.4 EMSC BANDA SEA

P: 30APR2023 152555 6.0S 130.0E 4.0-5.7 AAAAA West Irian, PNG

O: 1MAY2023 16:30:34 6.2S 131.9E ML=4.3 EMSC KEP. TANIMBAR REGION, INDONESI

P: 6MAY2023 152827 5.0S 131.0E 4.0-5.6 BBAAA West Irian, PNG

P: 8MAY2023 152828 7.0S 131.0E 4.0-5.5 CAAAA West Irian, PNG

O: 1MAY2023 07:54:06 9.4S 148.6E mb=5.0 EMSC EASTERN NEW GUINEA REG., P.N.G

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

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

CENTRAL AND SOUTH AMERICA

O: 1MAY2023 09:31:10 7.4S 74.6W mb=5.2 EMSC NORTHERN PERU

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

NEIC reported this earthquake of M 5.2 in Northern Peru was felt with intensity II-III in the area(s) of Northern Peru in Iquitos, Loreto.

O: 01MAY2023 17:13:35 7.8N 80.9W ML=4.3 EMSC PANAMA

O: 01MAY2023 17:22:14 7.8N 80.9W ML=4.3 EMSC PANAMA

O: 1MAY2023 23:32:16 7.8N 80.8W ML=4.4 EMSC PANAMA

P: 3MAY2023 152795 8.0N 83.0W 3.5-5.1 AABAA Costa Rica

P: 25APR2023 152524 7.0N 82.0W 3.5-5.3 CAAAA Costa Rica

O: 1MAY2023 19:11:14 14.5S 74.2W ML=4.0 EMSC CENTRAL PERU

P: 2MAY2023 153024 14.0S 73.0W 4.0-5.4 AAAAA Central Peru

O: 1MAY2023 07:59:31 14.8N 93.8W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO

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

O: 2MAY2023 03:13:22 15.8N 96.5W ML=4.0 EMSC OAXACA, MEXICO

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

P: 30APR2023 152576 16.0N 97.0W 3.5-5.5 AAAAA Oaxaca, Mexico

O: 01MAY2023 13:07:09 16.5N 95.2W ML=4.5 EMSC OAXACA, MEXICO

O: 1MAY2023 07:42:45 16.8N 94.2W ML=4.0 EMSC OAXACA, MEXICO

P: 2MAY2023 152834 15.0N 95.0W 3.5-5.3 ABAAA Chiapas, Mexico

P: 28APR2023 152560 16.0N 95.0W 3.5-5.2 BAAAA Chiapas, Mexico

O: 1MAY2023 23:44:06 17.5S 70.1W mb=4.1 EMSC SOUTHERN PERU

P: 2MAY2023 153031 17.0S 69.0W 4.0-5.7 AAAAA So. Peru/Bolivia

O: 2MAY2023 01:29:46 18.4N 101.5W ML=4.0 EMSC GUERRERO, MEXICO

P: 2MAY2023 152844 19.0N 102.0W 3.5-5.4 AAAAA Michoacan, Mexico

O: 1MAY2023 18:00:16 18.5N 66.2W ML=3.0 EMSC PUERTO RICO REGION

P: 2MAY2023 152854 19.0N 67.0W 3.4-5.5 AAAAA Puerto Rico

O: 01MAY2023 21:16:40 19.9N 70.3W ML=3.5 EMSC DOMINICAN REPUBLIC REGION

O: 1MAY2023 19:35:41 18.5N 68.8W ML=3.8 EMSC DOMINICAN REPUBLIC

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

O: 1MAY2023 21:43:01 18.5N 73.3W ML=3.8 EMSC HAITI REGION

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

O: 2MAY2023 01:56:54 19.6N 70.8W ML=3.5 EMSC DOMINICAN REPUBLIC

P: 5MAY2023 152855 19.0N 71.0W 3.4-5.5 BAAAA Puerto Rico

O: 1MAY2023 10:25:04 21.4S 69.0W mb=4.3 EMSC ANTOFAGASTA, CHILE

P: 1MAY2023 153042 22.0S 69.0W 4.0-5.8 AAAAA Coast No. Chile

O: 1MAY2023 21:51:40 24.3S 67.5W mb=4.2 EMSC SALTA, ARGENTINA

P: 8MAY2023 153039 24.0S 67.0W 4.0-5.9 CAAAA Argentina

AFRICA AND EUROPE

O: 1MAY2023 21:35:58 38.2N 38.6E ML=4.4 EMSC EASTERN TURKEY

P: 26APR2023 152660 38.0N 38.0E 3.5-5.1 BAAAA Turkey

O: 1MAY2023 15:06:02 39.6N 20.6E Mw=4.2 EMSC GREECE

P: 30APR2023 152630 39.0N 21.0E 3.0-4.6 AAAAA No. Greece

SOUTHWEST PACIFIC

O: 1MAY2023 23:00:32 10.1S 161.1E mb=4.5 EMSC SOLOMON ISLANDS

P: 7MAY2023 153035 11.0S 161.0E 4.0-5.4 CAAAA Vanuatu Islands

O: 1MAY2023 10:55:56 22.3S 179.4W Mw=5.6 EMSC SOUTH OF FIJI ISLANDS

P: 3MAY2023 153050 22.0S 179.0W 4.0-5.5 AAAAA Tonga Islands

OCEAN RIDGES

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

ZEALANDIA AND AUSTRALIA REGION

O: 1MAY2023 22:15:41 33.6S 180.0E ML=4.3 EMSC SOUTH OF KERMADEC ISLANDS

P: 1MAY2023 153063 31.0S 178.0E 4.0-5.4 ACBAA So. Kermadec Islands

O: 1MAY2023 11:59:57 30.0S 177.0W mb=5.1 EMSC KERMADEC ISLANDS REGION

P: 2MAY2023 153059 30.0S 177.0W 4.0-5.4 AAAAA No. Kermadec Islands

O: 1MAY2023 16:39:59 44.1S 168.5E ML=4.2 EMSC SOUTH ISLAND OF NEW ZEALAND

O: 01MAY2023 16:39:59 44.1S 168.5E MS=4.2 GEONET South Island, New Zealand

P: 3MAY2023 153069 44.0S 168.0E 3.0-4.9 AAAAA So. Island, N.Z.

GEONET reported this earthquake was felt with weak intensity in the area southwest of Te Anau, South Island. 13 reports of felt intensity came from the area east and north of the epicenter with 12 weak, 1 light, 0 moderate, 0 strong, 0 severe and 0 extreme shaking.

JAPAN AND KURIL ISLANDS

O: 01MAY2023 15:55:19 26.0N 128.6E mb=4.6 EMSC RYUKYU ISLANDS, JAPAN

O: 1MAY2023 07:59:39 26.0N 128.6E mb=5.3 EMSC RYUKYU ISLANDS, JAPAN

P: 3MAY2023 152873 27.0N 128.0E 4.0-5.4 AAAAA Ryukyu Islands

O: 1MAY2023 18:56:30 37.8N 141.7E ML=4.3 EMSC NEAR EAST COAST OF HONSHU, JAP

O: 01MAY2023 15:20:30 37.8N 141.8E ML=4.0 EMSC NEAR EAST COAST OF HONSHU, JAPAN

P: 2MAY2023 152931 38.0N 143.0E 4.0-5.4 AAAAA So. of Honshu

O: 2MAY2023 03:39:17 45.9N 148.8E mb=4.2 EMSC KURIL ISLANDS

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

P: 9MAY2023 152952 44.0N 150.0E 3.5-5.4 CBAAA Hokkaido, Japan

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 1MAY2023 08:08:38 30.9N 116.2W ML=3.5 EMSC OFFSHORE BAJA CALIFORNIA, MEXI

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

O: 01MAY2023 08:37:12 31.4N 115.3W ML=3.3 EMSC BAJA CALIFORNIA, MEXICO

O: 01MAY2023 10:52:21 31.4N 115.3W ML=3.4 EMSC BAJA CALIFORNIA, MEXICO

O: 1MAY2023 07:56:25 31.3N 115.3W ML=3.4 EMSC BAJA CALIFORNIA, MEXICO

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

O: 02MAY2023 04:29:37 32.7N 115.6W Ml=2.1 EMSC SOUTHERN CALIFORNIA

O: 01MAY2023 20:36:50 33.0N 116.0W ML=3.0 EMSC SOUTHERN CALIFORNIA

O: 01MAY2023 21:21:24 33.0N 116.0W Ml=2.5 EMSC SOUTHERN CALIFORNIA

O: 1MAY2023 21:35:47 32.7N 115.5W Ml=2.4 EMSC SOUTHERN CALIFORNIA

P: 2MAY2023 152918 32.7N 115.4W 2.5-4.7 AAAAA So. California

NEIC reported this earthquake of M 2.5 in Southern California was felt with intensity II-III in the area(s) of Southern California in El Centro and Calexico.

O: 1MAY2023 13:49:05 33.9N 116.8W ML=2.2 EMSC SOUTHERN CALIFORNIA

P: 6MAY2023 152924 33.9N 116.9W 2.5-4.8 BAAAA So. California

O: 2MAY2023 00:19:35 35.9N 117.5W ML=2.9 EMSC CENTRAL CALIFORNIA

P: 4MAY2023 152925 35.4N 117.7W 2.5-4.6 AAAAA So. California

P: 27APR2023 152650 35.9N 117.7W 2.5-4.4 BAAAA So. California

O: 1MAY2023 10:09:19 38.7N 122.9W Md=2.4 EMSC NORTHERN CALIFORNIA

O: 01MAY2023 20:40:18 38.8N 122.8W Md=2.4 EMSC NORTHERN CALIFORNIA

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

O: 1MAY2023 23:13:47 38.9N 123.7W Ml=3.6 EMSC NORTHERN CALIFORNIA

P: 29APR2023 152614 39.8N 123.5W 2.5-4.9 AAAAA Central California

O: 2MAY2023 06:06:42 40.3N 121.9W Md=2.6 EMSC NORTHERN CALIFORNIA

P: 27APR2023 152690 40.7N 122.3W 2.5-4.6 BAAAA Northern California

O: 2MAY2023 06:10:01 41.3N 124.3W ML=2.7 EMSC OFFSHORE NORTHERN CALIFORNIA

P: 27APR2023 152692 40.6N 124.9W 2.5-4.5 BAAAA Off Coast of No. Calif

ALASKA

O: 2MAY2023 02:04:01 56.4N 148.3W ml=3.3 EMSC GULF OF ALASKA

P: 5MAY2023 153015 55.0N 149.0W 3.0-5.0 BBAAA Northern Alaska

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

O: 01MAY2023 10:28:42 51.3N 130.9W MB=3.2 ECAN of Bella Bella, BC

O: 01MAY2023 01:18:50 51.4N 130.7W MB=3.2 ECAN of Bella Bella, BC

O: 1MAY2023 11:00:46 51.4N 130.8W MB=3.2 ECAN of Bella Bella, BC

P: 4MAY2023 152988 50.9N 130.6W 3.0-5.2 BAAAA British Colombia

O: 1MAY2023 05:45:56 48.5N 128.6W MB=3.1 ECAN of Tofino, BC

P: 26APR2023 152702 48.3N 128.5W 2.8-4.9 BAAAA Vancouver Island area

O: 29APR2023 10:09:43 59.3N 136.2W MB=3.0 ECAN of Skagway, AK

P: 4MAY2023 153003 59.0N 137.0W 3.0-4.4 BAAAA Southeast Alaska

O: 29APR2023 04:35:48 56.1N 116.6W MB=3.4 ECAN of Reno, AB

O: 29APR2023 04:20:28 56.1N 116.6W MB=4.1 ECAN of Reno, AB

P: 2MAY2023 152983 56.0N 120.0W 2.0-4.4 BABAA Alberta

ROCKY MOUNTAINS REGION

O: 1MAY2023 16:59:04 31.6N 104.2W ML=2.7 EMSC WESTERN TEXAS

O: 2MAY2023 02:35:35 31.7N 104.4W ML=2.9 EMSC WESTERN TEXAS

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

O: 1MAY2023 21:55:29 42.6N 111.4W Ml=2.3 EMSC SOUTHERN IDAHO

P: 6MAY2023 152980 43.2N 111.0W 2.0-4.3 BAAAA Yellowstone/Wyoming

EASTERN U.S./CANADA

O: 30APR2023 08:40:27 47.5N 70.1W MB=0.6 ECAN of La Pocati├¿re, QC

O: 30APR2023 01:47:20 47.0N 70.3W MB=1.9 ECAN of Cap-Saint-Ignace, QC

O: 29APR2023 16:42:32 46.7N 71.1W MB=2.1 ECAN of Qu├⌐bec, QC

O: 29APR2023 06:55:02 47.3N 70.3W MB=1.1 ECAN of Saint-Jean-Port-Joli, QC

O: 30APR2023 21:20:38 47.6N 70.2W MB=1.9 ECAN of La Malbaie, QC

P: 27APR2023 152685 47.0N 70.5W 2.0-4.4 BAAAA New England

O: 30APR2023 19:12:04 49.2N 92.0W MB=1.8 ECAN of Ignace, ON

O: 30APR2023 05:02:50 51.5N 92.9W MB=1.9 ECAN of Golden, ON

O: 30APR2023 13:43:03 48.7N 71.9W MB=3.0 ECAN of L'Ascension-de-Notre-Seigneur

P: 27APR2023 152685 47.0N 70.5W 2.0-4.4 BBAAA New England

O: 30APR2023 06:34:20 71.0N 72.7W MB=3.1 ECAN of Clyde River, NU

P: 26APR2023 152742 72.0N 73.0W 2.5-4.1 BAAAA Baffin/Davis Strait Canada

O: 30APR2023 04:25:02 48.3N 69.3W MB=1.4 ECAN of Les Escoumins, QC

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

O: 29APR2023 16:11:17 41.1N 55.4W MB=4.3 ECAN of Halifax, NS

O: 29APR2023 07:49:07 47.2N 78.4W MB=1.5 ECAN of Laforce, QC

P: 4MAY2023 152963 47.0N 76.0W 2.0-3.9 BABAA New York State

O: 02MAY2023 02:15:11 36.3N 89.5W mb=2.1 EMSC TENNESSEE

O: 1MAY2023 18:45:54 36.2N 89.4W mb=2.7 EMSC TENNESSEE

P: 25APR2023 152629 36.0N 89.0W 2.0-3.9 CAAAA New Madrid area

NEIC reported earthquakes of M 2.6 and M 2.8 in SE Missouri and Tennessee were felt with intensity II-III in the area(s) of SE Missouri in Ridgely, Obion, Tiptonville, Union City, Martin, South Fulton, Dresden, Tennessee and in Clinton, Kentucky.

HAWAII

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

STRONG QUAKE IN RYUKYU ISLANDS, JAPAN

EARTHQUAKE SUMMARY FOR APRIL 30, 2023

A moderately strong M 5.9 earthquake in the Ryukyu Islands, Japan occurred today after a series of moderate foreshocks including those of M 5.3, 5.2 and 5.0. The foreshocks began with an M 5.3 on April 27 and continued through April 29, 2023. Today's event was reported by NEIC to have been felt with intensity II-II in Okinawa at Gushikawa, Okinawa, Chatan, Irasoe, Naha and Yomitan. The last earthquake of M>=5.9 in the Okinawa area of the Ryukyu Islands within about 200 km of today's epicenter was an M 6.0 on July 26, 2017 and also on September 26, 2016. Today's mainshock occurred within minutes of local solar noon and was probably promoted by high tidal stresses which maximize near this hour. Forecast 152873 had expected this activity about 100 km north of today's epicenter in early May. This activity is located at 144 degrees from the M 6.7 in Ecuador of March 18 and was probably promoted by energy from that source.

O: 01MAY2023 02:21:03 26.0N 128.6E Mw=5.3 EMSC RYUKYU ISLANDS, JAPAN

O: 01MAY2023 02:22:31 26.0N 128.5E mb=5.2 EMSC RYUKYU ISLANDS, JAPAN

O: 01MAY2023 03:22:12 26.1N 128.5E Mw=5.9 EMSC RYUKYU ISLANDS, JAPAN

O: 01MAY2023 03:50:49 26.1N 128.7E mb=4.9 EMSC RYUKYU ISLANDS, JAPAN

O: 1MAY2023 04:02:31 25.9N 128.5E mb=5.0 EMSC RYUKYU ISLANDS, JAPAN

P: 3MAY2023 152873 27.0N 128.0E 4.0-5.4 ABAAA Ryukyu Islands

An M 5.2 earthquake north of Sicily, Italy today was felt with intensity I in Bonifati, Calabria, Italy. The last earthquake within about 150 km of this epicenter with M>=5.2 in Italy occurred on October 31, 2022 with M 5.5 and before that on October 28, 2016 with M 5.8. Earthquakes in this area occur at intermediate to deep focal depths (250-500 km) and have little effect on surface features. The October 31, 2022 was, like today's event associated about a week after a solar eclipse on October 25 as noted in this summary at the time:

"A moderately strong earthquake occurred at intermediate depth in southern Italy today with M 5.5. It was reported by NEIC to have been felt with intensity III in Platania, Calabria, Italy. This event was likely promoted by tidal stresses which maximized at this longitude (15E) with the solar eclipse and new moon of October 25, 2022.

The solar eclipse was near maximum over this area of Italy on October 25.

Today's earthquake of M 5.1-5.5 in Italy is the strongest located within about 200 km of this epicenter since an M 5.7-5.8 on October 26, 2006 and prior to that an M 5.9 on September 9, 1998." (October 31, 2022)

Forecasts 152626 and 152899 had expected today's activity within about 100 km of the epicenter was likely in late April or early May, 2023. This epicenter is at the third node from the M 7.0 in New Guinea of April 2, 2023 and at 104 degrees from the M 7.2 in Molucca of January 18, 2023 and may have been promoted by energy from those sources.

O: 1MAY2023 02:41:26 39.5N 15.5E mb=5.0 EMSC SOUTHERN ITALY

O: 1MAY2023 02:41:26 39.5N 15.5E mb=5.2 ANSS SOUTHERN ITALY

P: 5MAY2023 152899 39.0N 15.0E 3.0-5.0 BAAAA Mediterranean/Sicily

P: 24APR2023 152626 39.0N 14.0E 3.0-4.8 CABAA Mediterranean/Sicily

Earthquakes continued in southern California near Mexicali today. These were felt with intensity up to IV in Calexico, El Centro, Heber, Imperial, California. Earthquakes also continued in the Niland area of southern California. These were discussed in the previous issue of this summary as:

"The current swarm of earthquakes in Southern California enhanced and accelerated today while migrating to the north. The strongest earthquakes in this swarm today were M 4.5 and occurred about 50 km north of the Calexico swarm of the past several days. NEIC reported today's events were widely felt south of the Salton Sea with maximum intensity V in Calipatria and II-III in Westmorland, Niland, Brawley, Imperial, Thermal, El Centro, Calexico and Mexicali, Baja California. The last earthquake in this area of Southern California of larger or equal magnitude to today's M 4.5 was an M 5.3 on June 5, 2021 and an M 4.6 on August 10, 2020 and prior to that an M 5.0 on March 24, 2009, fourteen years ago." (April 30, 2023)

The mainshocks of M 4.3 and 4.5 today occurred near local solar midnight and were probably promoted by string stresses which maximize near this hour.

Forecasts 152918 and 152642 had expected enhanced seismicity in this area in late April or early May, 2023. It is likely that this sequence will dissipate quickly. The following is a listing of events of M>=3 in the area today. A more extensive list can be found in the regional "CALIFORNIA" section of this summary. This activity is located at 102-105 degrees from the M 7.8 in Turkey of February 6 and the M 7.0 in New Guinea of April 2, 2023 and was probably promoted by energy from those sources.

O: 30APR2023 07:09:34 33.2N 115.6W mb=4.5 EMSC SOUTHERN CALIFORNIA

O: 30APR2023 07:12:27 33.2N 115.6W ML=3.0 EMSC SOUTHERN CALIFORNIA

O: 30APR2023 07:58:18 33.2N 115.6W Mw=4.3 EMSC SOUTHERN CALIFORNIA

O: 30APR2023 08:01:16 33.2N 115.6W ML=3.0 EMSC SOUTHERN CALIFORNIA

O: 30APR2023 11:44:03 33.2N 115.6W ML=3.1 EMSC SOUTHERN CALIFORNIA

P: 2MAY2023 152918 32.7N 115.4W 2.5-4.7 AAAAA So. California

P: 30APR2023 152642 32.9N 115.6W 2.5-4.9 AAAAA So. California

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

OTHER GLOBAL EARTHQUAKE ACTIVITY

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 projected seismicity map follows for the coming week.

OTHER GLOBAL EARTHQUAKE ACTIVITY

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 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