- Earthquake summary

CURRENT QUIET CONTINUES - DEPTH MAY BE IMPORTANT FACTOR

EARTHQUAKE SUMMARY FOR MARCH 26, 2023

The current seismic quiet period continued today. During this period which began late on March 22, there have been 9 earthquakes in the world of M>=5.3 and none of M>=6. Five of these have occurred at deep or intermediate focal depths include an M 5.4 in Antofagasta, Chile, an M 5.6 in Fiji, an M 5.7 in Papua and two in Argentina of M 5.3 and 6.5. A strong series of moderate to large earthquake occurred beginning on March 21, 2023 and include 11 events in the next two days of M>=5.3. The dominance of deep and intermediate focus earthquakes since mid-March 22 suggests that whatever triggered the seiemicity on March 21-22 did not effectively extend to deeper focal depths. Since the beginning of 2022, there have been 146 earthquake at deep or intermediate focus (>100 km depth) and 787 of depth shallower than 100 km - a ratio of 0.18 or about 1 in every five earthquakes of this magnitude occur at depths greater than 100 km. The current ratio near 0.5 suggest an anomaly and could be used to examine triggering mechanisms. The depth of an earthquake is important in mitigating seismic hazard as deeper focus event have far less effects on the surface than shallow earthquake. Deeper focus events also tend to occur only in subduction zones and not in areas of horizontal displacement. The end of the current quiet period will probably occur with a series of strong solar flares and show up as a moderately large earthquake near 100 km depth.

The strongest earthquake in the world today and the only event of M>=5.1 was an M 5.5 in the Fiji Islands. It occurred at a deep focus of 459 km and was consistent with the hypothesis that these deep focus events have not been significantly affected by the current seismic quiet period. This earthquake occurred near local solar noon and was probably promoted by strong tidal stresses which maximize near this hour. This is the strongest earthquake within about 150 km of this epicenter since an M 5.6 on August 2, 2022 and an M 5.7 on December 17, 2021. Forecast 151925 had expected the region within about 100 km of this epicenter would show seismic enhancement around March 24. This epicenter is located at 103 degrees from the M 6.8 in Argentina of January 20, 2023 and other strong quakes near this in the past week and was probably promoted by energy from those sources.

O: 27MAR2023 02:29:21 17.9S 178.2W Mw=5.5 EMSC FIJI REGION

P: 24MAR2023 151925 17.0S 178.0W 4.0-5.4 BAAAA Tonga Islands

An M 4.6-4.9 occurred today in the Cook Strait, New Zealand. This earthquake occurred within minutes of local solar noon and was probably promoted by strong tidal stresses which maximize near this hour. GEONET reported this earthquake was felt with moderate to strong intensity in the area southeast of Wellington, New Zealand and in southern North Island and northern South Island. 2749 reports of felt events were made of which 1935 reported weak and 786 light intensity with 54 report of moderate shaking and 4 with strong and 0 severe and 2 with extreme intensity came from the area. NEIC reported this earthquake of M 4.6 in Cook Strait New Zealand was felt with intensity II-III in the area(s) of Cook Strait New Zealand in Wanganui, Feilding, Kapiti, Palmerston North, Lower Hutt, Wellington and Nelson. The last earthquake in the Cook Strait with M>=4.9 was an M 5.7 on February 15, 2023. This is probably an aftershock of that event. At the time this summary noted in this regard:

"Today's earthquake in the Cook Strait is the strongest in this region south of Wellington, New Zealand since an M 6.2 on January 20, 2014 about 150 km east of today's epicenter. Earthquakes about 150 km to the south of this occurred with M 6.4-6.5 in South Island on July 21 and August 16, 2013, the only such events in the region of Cook Strait in the past 35 years." (February 15, 2023)

Forecast 151954 had expected today's event in New Zealand was likely within about 50 km of this epicenter around March 27. This epicenter is located at the

third node (120 degrees) from the M 7.2 in Tajikistan of February 23, 2023 and at 101 degrees from the M 6.7 in Ecuador of March 18, 2023 and may have been promoted by energy from that source.

O: 27MAR2023 00:42:15 40.2S 174.4E MS=4.9 GEONET Cook Strait, New Zealand

O: 27MAR2023 00:42:14 40.2S 174.5E mb=4.6 EMSC COOK STRAIT, NEW ZEALAND

P: 27MAR2023 151954 40.0S 174.0E 3.0-4.4 AAAAA North Island, N.Z.

The Strongest earthquake in the U.S. or Canada today was an M 4.7 south of the western Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last earthquake within about 100 km of this epicenter south of the Aleutians was an M 5.4 on September 9, 2019. Most events in this area occur more than 100 km to the north of today's epicenter. Forecast 151872 had expected enhanced activity to the northeast of this epicenter was likely around March 27. This activity is at the fifth node (72 degrees) from the M 7.2 in Tajikistan of February 23, 2023 and may have been promoted by energy from that source.

O: 27MAR2023 05:25:19 50.0N 178.7W mb=4.7 EMSC SOUTH OF ALEUTIAN ISLANDS

P: 27MAR2023 151872 51.7N 176.4W 3.5-5.1 ABBAA Andreanoff Isls, Aleutians

An earthquake of M 4.4 also occurred today in the area of Loi'hi Seamount south of Hawaii. It was accompanied by several light foreshocks and aftershocks. The Loi'hi Seamount is an incipient volcanic area precipitated by the Hawaiian hot spot as the Pacific plate moves over that plume. The last earthquakes of M>=4.4 in the Loi'hi area were an M 4.6 on July 27, 2022; an M 4.9 on December 24, 2021 and an M 6.2 on October 10, 2021. At that time this summary noted:

"A strong earthquake of M 6.2 shook most of the state of Hawaii, U.S. today. …There have been only two earthquakes in Hawaii with M>=6.2 in the past 30 years – both north of today's epicenter in central and northern Hawaii Island - on May 4, 2018 with M 6.9 and as an M 6.7 on October 15, 2006. Today's earthquake occurred near the Loi'hi Seamount south of Hawaii and is not directly associated with the current major eruption of Kilauea volcano to the north. The shaking caused some doors to open and some items to be thrown from shelves in businesses. No major damage or casualties were reported and a tsunami does not appear to have been generated with this earthquake. The earthquake occurred within minutes of the maximum of a geomagnetic storm at local solar noon and was probably promoted by high tidal stresses associated with the new moon" (October 10, 2021)

Forecast 151723 had expected enhanced seismicity in Hawaii near this epicenter was likely around March 27.

NEIC reported this earthquake of M 4.1-4.4 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Naalehu and Pahoa. This activity is at the seventh node (52-53 degrees) from recent earthquakes in the Solomon Islands of M 7.0 of November 22, 2022 and from the Kermadec Islands M 7.0 of March 16, 2023 and may have been promoted by energy from those sources.

O: 26MAR2023 20:36:26 18.9N 155.2W ML=3.4 EMSC HAWAII REGION, HAWAII

O: 27MAR2023 01:59:11 18.9N 155.2W ML=3.2 EMSC HAWAII REGION, HAWAII

O: 27MAR2023 04:39:15 18.8N 155.2W ML=4.4 EMSC HAWAII REGION, HAWAII

P: 27MAR2023 151723 19.2N 155.2W 3.0-4.7 AAAAA Hawaii

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: 26MAR2023 23:23:29 36.4N 70.1E mb=4.2 EMSC HINDU KUSH REGION, AFGHANISTAN

O: 26MAR2023 13:14:32 36.5N 71.4E mb=4.4 EMSC HINDU KUSH REGION, AFGHANISTAN

P: 27MAR2023 151779 36.0N 71.0E 3.8-5.4 AAAAA Hindu Kush/Pakistan

INDONESIA AND PHILIPPINES

O: 27MAR2023 04:57:23 3.9S 133.6E ML=4.1 EMSC PAPUA, INDONESIA

O: 26MAR2023 09:40:04 3.8S 134.9E ML=4.1 EMSC PAPUA, INDONESIA

P: 22MAR2023 151712 4.0S 135.0E 4.0-5.8 BAAAA West Irian, PNG

O: 26MAR2023 15:53:42 4.1N 126.4E ML=4.4 EMSC KEPULAUAN TALAUD, INDONESIA

P: 23MAR2023 151686 5.0N 126.0E 4.0-5.6 BAAAA Mindanao, Philippines

P: 28MAR2023 151686 4.0N 125.0E 4.0-5.6 AABAA Mindanao, Philippines

O: 26MAR2023 12:41:12 4.9S 132.0E mb=5.0 EMSC BANDA SEA

P: 25MAR2023 151713 5.0S 130.0E 4.0-5.4 AABAA West Irian, PNG

O: 27MAR2023 00:44:51 5.5N 125.8E mb=4.6 EMSC MINDANAO, PHILIPPINES

P: 26MAR2023 151686 6.0N 125.0E 4.0-5.5 AAAAA Mindanao, Philippines

O: 27MAR2023 02:56:06 5.6S 146.9E mb=4.6 EMSC EASTERN NEW GUINEA REG., P.N.G

P: 27MAR2023 151701 6.0S 146.0E 4.0-5.4 AAAAA New Ireland

O: 26MAR2023 18:22:29 6.3S 104.3E ML=4.2 EMSC SUNDA STRAIT, INDONESIA

P: 28MAR2023 151708 6.0S 103.0E 4.0-5.4 AABAA So. of Sumatera

P: 31MAR2023 151708 6.0S 104.0E 4.0-5.5 BAAAA So. of Sumatera

O: 27MAR2023 00:36:57 7.1S 129.7E mb=4.4 EMSC KEPULAUAN BABAR, INDONESIA

P: 30MAR2023 151691 8.0S 129.0E 4.0-5.4 BAAAA Banda Sea

O: 26MAR2023 10:43:45 7.5S 130.3E mb=4.9 EMSC KEP. TANIMBAR REGION, INDONESIA

O: 26MAR2023 18:39:55 7.4S 130.2E Mw=4.9 EMSC KEP. TANIMBAR REGION, INDONESI

P: 31MAR2023 151713 6.0S 130.0E 4.0-5.6 BBAAA West Irian, PNG

O: 26MAR2023 23:07:16 7.9S 128.0E ML=4.1 EMSC KEPULAUAN BARAT DAYA, INDONESI

P: 30MAR2023 151691 8.0S 129.0E 4.0-5.4 BAAAA Banda Sea

O: 26MAR2023 21:46:54 10.8S 113.2E ML=4.4 EMSC SOUTH OF JAVA, INDONESIA

P: 21MAR2023 151706 9.0S 114.0E 4.0-5.6 BBAAA So. of Bali

O: 26MAR2023 12:38:17 17.5N 120.8E mb=4.6 EMSC LUZON, PHILIPPINES

P: 21MAR2023 151728 17.0N 120.0E 3.5-4.9 BAAAA Luzon, Philippines

CENTRAL AND SOUTH AMERICA

O: 26MAR2023 23:00:41 6.9N 73.1W mb=4.4 EMSC NORTHERN COLOMBIA

P: 28MAR2023 151679 7.0N 73.0W 4.0-5.4 AAAAA Colombia

O: 26MAR2023 14:24:30 10.3N 84.3W ML=4.5 EMSC COSTA RICA

P: 25MAR2023 151716 10.0N 84.0W 3.5-5.5 AAAAA Caribbean Sea

O: 26MAR2023 22:17:11 16.4S 74.3W ML=4.7 EMSC NEAR COAST OF SOUTHERN PERU

P: 26MAR2023 151918 16.0S 73.0W 4.0-5.8 AABAA So. Peru/Bolivia

O: 26MAR2023 13:59:49 17.9N 95.8W ML=4.0 EMSC VERACRUZ, MEXICO

P: 29MAR2023 151719 17.0N 95.0W 3.5-5.3 BAAAA Chiapas, Mexico

O: 26MAR2023 23:53:46 18.1N 103.3W ML=4.1 EMSC OFFSHORE MICHOACAN, MEXICO

P: 27MAR2023 151731 18.0N 104.0W 3.5-5.5 AAAAA Michoacan, Mexico

O: 26MAR2023 17:58:11 18.8N 101.7W mb=4.2 EMSC MICHOACAN, MEXICO

P: 23MAR2023 151730 18.0N 101.0W 3.5-5.6 BAAAA Michoacan, Mexico

O: 27MAR2023 03:29:06 19.0N 65.0W Md=3.3 EMSC VIRGIN ISLANDS REGION

P: 29MAR2023 151725 19.0N 65.0W 3.0-5.3 AAAAA Leeward Islands

O: 26MAR2023 10:12:20 19.2N 67.8W Md=3.5 EMSC DOMINICAN REPUBLIC REGION

O: 26MAR2023 08:38:38 19.1N 67.9W Md=3.8 EMSC DOMINICAN REPUBLIC REGION

P: 24MAR2023 151744 20.0N 69.0W 3.0-4.9 AAAAA Bahamas/No. Caribbean

O: 27MAR2023 04:22:17 24.3S 67.3W mb=4.1 EMSC SALTA, ARGENTINA

P: 22MAR2023 151930 24.0S 66.0W 4.0-5.9 BAAAA Argentina

O: 26MAR2023 11:39:01 25.7S 69.1W Mw=4.9 EMSC ATACAMA, CHILE

P: 23MAR2023 151931 27.0S 71.0W 4.0-5.7 BBBAA Coast Central Chile

O: 26MAR2023 17:26:41 36.5S 72.7W Mw=4.7 EMSC BIO-BIO, CHILE

P: 24MAR2023 151947 37.0S 70.0W 4.0-5.6 AABAA Central Chile

NEIC reported this earthquake of M 4.7 in Bio-Bio, Chile was felt with intensity II-III in the area(s) of Bio-Bio, Chile in Concepcion (IV), Penco, Chiguayante, Cabrero and in Angol, Araucania.

AFRICA AND EUROPE

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

SOUTHWEST PACIFIC

O: 27MAR2023 02:29:21 17.9S 178.2W Mw=5.5 EMSC FIJI REGION

P: 24MAR2023 151925 17.0S 178.0W 4.0-5.4 BAAAA Tonga Islands

O: 27MAR2023 02:53:46 22.8S 171.7E mb=5.0 EMSC SOUTHEAST OF LOYALTY ISLANDS

P: 23MAR2023 151933 22.0S 172.0E 4.0-5.8 BAAAA Loyalty Islands

O: 27MAR2023 02:42:37 26.2S 178.5E mb=4.5 EMSC SOUTH OF FIJI ISLANDS

P: 20MAR2023 151653 25.0S 179.0E 4.0-5.4 CBAAA 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: 27MAR2023 00:42:15 40.2S 174.4E MS=4.9 GEONET Cook Strait, New Zealand

O: 27MAR2023 00:42:14 40.2S 174.5E mb=4.6 EMSC COOK STRAIT, NEW ZEALAND

P: 27MAR2023 151954 40.0S 174.0E 3.0-4.4 AAAAA North Island, N.Z.

JAPAN AND KURIL ISLANDS

O: 26MAR2023 14:33:04 38.4N 141.6E mb=4.5 EMSC NEAR EAST COAST OF HONSHU, JAPAN

O: 26MAR2023 15:04:20 38.3N 141.6E Mw=4.9 EMSC NEAR EAST COAST OF HONSHU, JAP

P: 26MAR2023 151833 40.0N 142.0E 3.5-5.4 ABAAA Hokkaido, Japan

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 26MAR2023 09:22:21 30.8N 114.2W ML=3.5 EMSC GULF OF CALIFORNIA

P: 26MAR2023 151799 30.2N 114.4W 2.0-4.4 AAAAA SW U.S.A

O: 26MAR2023 23:12:30 32.6N 115.2W Ml=2.3 EMSC BAJA CALIFORNIA, MEXICO

P: 21MAR2023 151803 32.4N 115.8W 2.5-4.8 BAAAA So. California

O: 26MAR2023 21:06:43 33.6N 116.8W Ml=2.0 EMSC SOUTHERN CALIFORNIA

P: 26MAR2023 151804 33.4N 116.7W 2.5-4.6 AAAAA So. California

O: 26MAR2023 14:14:49 36.0N 121.0W Md=2.1 EMSC CENTRAL CALIFORNIA

O: 26MAR2023 11:24:30 36.2N 120.8W Md=2.2 EMSC CENTRAL CALIFORNIA

P: 27MAR2023 151767 36.4N 121.0W 2.5-4.7 AAAAA Central California

O: 27MAR2023 01:50:35 37.1N 121.5W Md=2.4 EMSC NORTHERN CALIFORNIA

P: 25MAR2023 151770 37.3N 121.6W 2.5-4.6 AAAAA Central California

O: 27MAR2023 00:03:31 37.9N 122.1W Md=2.3 EMSC SAN FRANCISCO BAY AREA, CALIF.

P: 24MAR2023 151770 38.0N 122.3W 2.5-4.6 BAAAA Central California

ALASKA

O: 27MAR2023 05:25:19 50.0N 178.7W mb=4.7 EMSC SOUTH OF ALEUTIAN ISLANDS

P: 27MAR2023 151872 51.7N 176.4W 3.5-5.1 ABBAA Andreanoff Isls, Aleutians

O: 27MAR2023 04:50:00 53.6N 170.6W mb=4.2 EMSC FOX ISLANDS, ALEUTIAN ISLANDS

P: 28MAR2023 151879 52.5N 169.2W 3.5-5.0 AAAAA Fox Islands, Aleutians

O: 26MAR2023 16:10:03 60.3N 151.5W mb=4.0 EMSC KENAI PENINSULA, ALASKA

O: 26MAR2023 16:10:03 60.3N 151.5W mb=3.6 ANSS KENAI PENINSULA, ALASKA

P: 27MAR2023 151893 61.1N 150.2W 3.2-4.9 AAAAA Central Alaska

NEIC reported this earthquake of M 3.6-4.0 in Kenai, Alaska was felt with intensity II-III in the area(s) of Kenai, Alaska in Kasilof, Soldotna, Ninilchik, Anchor Point, Kenai, Homer, Seward and Eagle River.

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

O: 27MAR2023 04:53:13 43.4N 126.9W mb=4.0 EMSC OFF COAST OF OREGON

P: 28MAR2023 151853 41.8N 126.9W 2.5-4.4 ABAAA Off Coast of No. Calif

NEIC reported this earthquake of M 4.0 off the coast of Oregon was felt with intensity II-III in the area(s) of Oregon in Langlois.

ROCKY MOUNTAINS REGION

O: 26MAR2023 07:11:27 31.6N 104.4W ML=3.3 EMSC WESTERN TEXAS

P: 24MAR2023 151800 31.5N 103.6W 2.0-3.9 AAAAA SW U.S.A

P: 29MAR2023 151800 32.5N 104.6W 2.0-3.9 BAAAA SW U.S.A

O: 27MAR2023 01:55:01 32.0N 103.8W ML=3.4 EMSC NEW MEXICO

P: 24MAR2023 151800 31.5N 103.6W 2.0-3.9 BAAAA SW U.S.A

P: 29MAR2023 151800 32.5N 104.6W 2.0-3.9 AAAAA SW U.S.A

NEIC reported this earthquake of M 3.4 in New Mexico was felt with intensity II-III in the area(s) of New Mexico in Loving.

EASTERN U.S./CANADA

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

HAWAII

O: 26MAR2023 20:36:26 18.9N 155.2W ML=3.4 EMSC HAWAII REGION, HAWAII

O: 27MAR2023 01:59:11 18.9N 155.2W ML=3.2 EMSC HAWAII REGION, HAWAII

O: 27MAR2023 04:39:15 18.8N 155.2W ML=4.4 EMSC HAWAII REGION, HAWAII

P: 27MAR2023 151723 19.2N 155.2W 3.0-4.7 AAAAA Hawaii

MODERATE QUAKE SHAKES ATACAMA, CHILE

EARTHQUAKE SUMMARY FOR MARCH 25, 2023

Once again there was only one earthquake in the world today with M>5.0. This

continues the major quiet period of the past three days. The strongest earthquake in the world today was an M 5.4 in northern Chile. NEIC reported it was felt with intensity II-III in Calama, Antofagasta and in Iquique, Tarapaca, Chile. A foreshock of M 4.6 was felt with intensity II in Diego de Almagro, Atacama, Chile. Today's M 5.4 is the strongest earthquake in the region of Antofagasta, Chile since an M 5.6 on December 10, 2022. At the time this summary noted:

"The strongest earthquake in the world today was an M 5.6 in Antofagasta, Chile. NEIC reported maximum intensity IV in Calama, Antofagasta and II-III in Iquique, Tarapaca and in Valparaiso in Vina del Mar and San Antonio, Chile. This earthquake was accompanied by the eruption of the Lascar Volcano in Antofagasta, Chile. This eruption involved smoke, ash and lava and is a major eruption of this volcano. Lascar is located at 23.37S 67.73W in Antofagasta and is the most active of the volcanoes in the northern Andes of Chile. Chile's National Geology and Mining Service reported the eruption began within minutes of local solar noon (12:36 pm) and may have been triggered by high tidal stresses with the full moon which maximize near this hour. Ash reached heights of 6000 meters above the volcano. While no damage has been reported, air traffic has been alerted to the ash plume and evacuations may eventually be required. The last major eruption of Lascar was in 1993 but minor eruptive cycles occurred in 2006 and 2015. Other areas of Chile which might see enhanced volcanism at this time are the Villarrica volcano and Nevados de Chillan.

The earthquake of M 5.6 is the strongest within about 200 km of this epicenter in Antofagasta, Chile since an M 6.2 on July 27, 2022 and an M 5.7 on April 20, 2022. These may be aftershocks of an M 6.8 that hit near this on June 3, 2020." (December 10, 2022)

Forecast 151932 had expected today's M 5.4 was likely within about 100 km around March 27. Today's epicenter is at 143 degrees from the M 7.2 in Tajikistan of February 23, 2023 and from the M 7.6 of January 9 in the Banda Sea and may have been promoted by energy from those sources.

O: 26MAR2023 00:02:43 21.1S 68.6W Mw=5.4 EMSC ANTOFAGASTA, CHILE

P: 27MAR2023 151932 22.0S 69.0W 4.0-6.0 AAAAA Coast No. Chile

The strongest earthquake in the U.S. or Canada today was an M 4.3 in the Fox Islands, Aleutians, Alaska. This is probably a regional aftershock of the M 4.9 of March 20, 2023. It was not felt in this remote area. Forecast 151879 had expected this event within about 50 km was likely around March 28.

O: 26MAR2023 01:43:02 52.4N 168.2W mb=4.3 EMSC FOX ISLANDS, ALEUTIAN ISLANDS

P: 28MAR2023 151879 52.5N 169.2W 3.5-5.0 AAAAA Fox Islands, Aleutians

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 25MAR2023 12:03:44 22.7N 95.3E mb=4.3 EMSC MYANMAR

P: 22MAR2023 151752 21.0N 95.0E 4.0-5.5 BBAAA Myanmar

O: 26MAR2023 04:43:49 21.5N 121.4E mb=4.4 EMSC TAIWAN REGION

O: 26MAR2023 04:43:52 21.6N 121.3E ML=4.6 TAI Hualien, Taiwan

P: 26MAR2023 151760 22.0N 123.0E 4.0-5.4 AABAA Taiwan

NEIC reported this earthquake of M 4.4 south of Taiwan was felt with intensity II-III in the area(s) of south of Taiwan in Chungli, Taoyuan.

CWB reported this earthquake was felt with intensity III in Taitung, and I in Pingtun Counties, Taiwan.

O: 25MAR2023 18:13:07 28.9N 51.4E mb=4.6 EMSC SOUTHERN IRAN

P: 24MAR2023 151757 29.0N 53.0E 3.5-5.1 AABAA So. Iran/Persian Gulf

P: 30MAR2023 151757 28.0N 52.0E 3.5-5.4 BAAAA So. Iran/Persian Gulf

O: 25MAR2023 19:13:32 32.6N 47.7E mb=4.8 EMSC IRAN-IRAQ BORDER REGION

P: 27MAR2023 151814 33.0N 48.0E 3.8-5.4 AAAAA So. Iran

O: 26MAR2023 04:28:29 44.9N 102.1E mb=4.5 EMSC CENTRAL MONGOLIA

P: 16MAR2023 151529 39.0N 100.0E 3.5-5.0 CCBAA So. China

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

INDONESIA AND PHILIPPINES

O: 25MAR2023 22:53:19 1.2N 128.2E ML=4.6 EMSC HALMAHERA, INDONESIA

P: 27MAR2023 151682 2.0N 129.0E 4.0-5.4 AAAAA Halmahera

O: 25MAR2023 10:17:13 2.3S 139.1E ML=4.3 EMSC NEAR N COAST OF PAPUA, INDONES

P: 21MAR2023 151711 1.0S 137.0E 4.0-5.6 BBBAA West Irian, PNG

O: 25MAR2023 20:12:19 3.0S 136.9E ML=4.3 EMSC NEAR N COAST OF PAPUA, INDONES

P: 21MAR2023 151711 1.0S 137.0E 4.0-5.6 BBAAA West Irian, PNG

O: 25MAR2023 14:19:42 3.1S 142.8E ML=4.0 EMSC NEAR N COAST OF NEW GUINEA, PN

P: 27MAR2023 151705 3.0S 143.0E 4.0-5.4 AAAAA Papua New Guinea

O: 25MAR2023 18:58:12 4.2S 137.0E ML=4.2 EMSC PAPUA, INDONESIA

P: 22MAR2023 151712 4.0S 135.0E 4.0-5.8 BABAA West Irian, PNG

O: 25MAR2023 10:16:26 5.2N 125.5E mb=4.3 EMSC MINDANAO, PHILIPPINES

P: 23MAR2023 151686 5.0N 126.0E 4.0-5.6 AAAAA Mindanao, Philippines

O: 26MAR2023 02:53:26 5.3N 94.4E mb=4.5 EMSC NORTHERN SUMATRA, INDONESIA

P: 17MAR2023 151409 5.0N 97.0E 4.0-5.4 CACAA Nicobar Islands

O: 25MAR2023 09:11:01 5.3S 102.0E mb=4.4 EMSC SOUTHERN SUMATRA, INDONESIA

P: 28MAR2023 151708 6.0S 103.0E 4.0-5.4 BAAAA So. of Sumatera

O: 26MAR2023 00:42:01 8.2S 119.6E ML=4.0 EMSC FLORES REGION, INDONESIA

P: 24MAR2023 151710 8.0S 119.0E 4.0-5.6 AAAAA Sumbawa Island area

O: 25MAR2023 16:32:20 8.8S 109.8E ML=4.0 EMSC JAVA, INDONESIA

P: 21MAR2023 151707 9.0S 110.0E 4.0-5.5 BAAAA So. of Java

P: 26MAR2023 151922 10.0S 109.0E 4.0-5.5 ABAAA So. of Java

O: 25MAR2023 21:35:38 17.2N 120.9E mb=4.5 EMSC LUZON, PHILIPPINES

P: 21MAR2023 151728 17.0N 120.0E 3.5-4.9 BAAAA Luzon, Philippines

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

CENTRAL AND SOUTH AMERICA

O: 25MAR2023 07:34:06 5.8S 77.6W ML=4.0 EMSC NORTHERN PERU

P: 26MAR2023 151703 6.0S 79.0W 4.0-5.5 AABAA No. Peru

O: 26MAR2023 02:24:15 9.9N 83.9W mb=4.1 EMSC COSTA RICA

P: 25MAR2023 151716 10.0N 84.0W 3.5-5.5 AAAAA Caribbean Sea

NEIC reported this earthquake of M 4.1 in Costa Rica was felt with intensity II-III in the area(s) of Costa Rica in Ipsis, San Jose, Alajuela, and Quepos, Puntarenas.

O: 26MAR2023 02:17:48 15.2N 94.3W mb=4.2 EMSC OFFSHORE CHIAPAS, MEXICO

P: 25MAR2023 151719 16.0N 95.0W 3.5-5.5 AAAAA Chiapas, Mexico

O: 25MAR2023 15:29:36 16.0N 93.9W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO

O: 26MAR2023 06:51:47 15.9N 92.8W ML=4.1 EMSC CHIAPAS, MEXICO

P: 26MAR2023 151722 15.0N 92.0W 3.5-5.1 AAAAA Guatemala

O: 25MAR2023 13:17:03 16.0N 96.1W ML=4.1 EMSC OAXACA, MEXICO

P: 24MAR2023 151735 15.0N 96.0W 3.5-5.4 AAAAA Oaxaca, Mexico

P: 25MAR2023 151719 16.0N 95.0W 3.5-5.5 AAAAA Chiapas, Mexico

O: 25MAR2023 21:16:38 16.1N 96.2W ML=4.0 EMSC OAXACA, MEXICO

O: 26MAR2023 00:15:32 16.9N 95.7W ML=4.2 EMSC OAXACA, MEXICO

P: 25MAR2023 151719 16.0N 95.0W 3.5-5.5 AAAAA Chiapas, Mexico

O: 25MAR2023 20:23:16 17.1S 72.2W ML=4.0 EMSC NEAR COAST OF SOUTHERN PERU

P: 26MAR2023 151920 18.0S 72.0W 4.0-5.8 AAAAA So. Peru/Bolivia

O: 25MAR2023 15:20:37 17.3N 94.1W ML=4.0 EMSC VERACRUZ, MEXICO

P: 25MAR2023 151719 16.0N 95.0W 3.5-5.5 ABAAA Chiapas, Mexico

O: 25MAR2023 16:27:09 17.9S 74.3W mb=4.6 EMSC OFF COAST OF SOUTHERN PERU

P: 28MAR2023 151920 18.0S 73.0W 4.0-5.8 BAAAA So. Peru/Bolivia

O: 26MAR2023 00:17:26 18.5N 68.4W MD=4.2 EMSC MONA PASSAGE, DOMINICAN REPUBL

P: 27MAR2023 151738 18.0N 69.0W 3.4-5.1 AAAAA Puerto Rico

O: 26MAR2023 00:41:05 19.3N 67.9W ML=3.5 EMSC DOMINICAN REPUBLIC REGION

P: 24MAR2023 151744 20.0N 69.0W 3.0-4.9 AAAAA Bahamas/No. Caribbean

O: 26MAR2023 00:02:43 21.1S 68.6W Mw=5.4 EMSC ANTOFAGASTA, CHILE

P: 27MAR2023 151932 22.0S 69.0W 4.0-6.0 AAAAA Coast No. Chile

O: 26MAR2023 00:39:53 22.4S 66.2W mb=4.6 EMSC JUJUY, ARGENTINA

P: 21MAR2023 151930 22.0S 67.0W 4.0-5.7 BAAAA Argentina

O: 25MAR2023 07:30:13 23.0S 68.8W Mw=4.6 EMSC ANTOFAGASTA, CHILE

P: 27MAR2023 151932 22.0S 69.0W 4.0-6.0 AAAAA Coast No. Chile

O: 25MAR2023 18:34:16 23.7N 109.5W ML=3.5 EMSC GULF OF CALIFORNIA

O: 25MAR2023 18:29:06 23.7N 109.5W ML=3.3 EMSC GULF OF CALIFORNIA

P: 25MAR2023 151747 24.0N 109.0W 3.5-5.1 AAAAA Gulf of California

AFRICA AND EUROPE

O: 25MAR2023 20:56:05 34.7N 25.4E mb=4.3 EMSC CRETE, GREECE

P: 28MAR2023 151777 34.0N 25.0E 3.0-4.9 BAAAA Crete

O: 25MAR2023 17:39:37 36.6N 4.0E mb=3.7 EMSC NORTHERN ALGERIA

P: 29MAR2023 151823 37.0N 4.0E 3.0-4.7 BAAAA Western Mediterranean

O: 26MAR2023 03:07:37 44.8N 42.6E mb=4.2 EMSC CAUCASUS REGION, RUSSIA

P: 16MAR2023 151548 43.0N 44.0E 3.5-5.0 CBAAA Caucasus/Caspian Sea

O: 25MAR2023 23:32:09 45.5N 26.3E ML=3.9 EMSC ROMANIA

P: 24MAR2023 151860 46.0N 25.0E 3.0-5.0 AAAAA Romania/NW Turkey

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

SOUTHWEST PACIFIC

O: 25MAR2023 21:55:34 16.1S 174.8W mb=4.6 EMSC TONGA

P: 24MAR2023 151915 15.0S 173.0W 4.0-5.6 ABBAA Samoa Islands

O: 25MAR2023 19:57:56 18.2S 168.0E mb=4.8 EMSC VANUATU

O: 25MAR2023 23:29:04 18.2S 168.0E mb=4.8 EMSC VANUATU

P: 23MAR2023 151928 19.0S 168.0E 4.0-5.6 AAAAA Vanuatu Islands

O: 25MAR2023 09:46:50 20.4S 177.8W Mw=4.9 EMSC FIJI REGION

P: 22MAR2023 151939 20.0S 178.0W 4.0-5.4 BAAAA Tonga Islands

O: 25MAR2023 09:58:34 21.0S 173.5E Mw=5.0 EMSC VANUATU REGION

P: 23MAR2023 151933 22.0S 172.0E 4.0-5.8 AABAA Loyalty Islands

P: 30MAR2023 151942 21.0S 174.0E 4.0-5.4 BAAAA Tonga/Fiji

OCEAN RIDGES

O: 25MAR2023 13:57:41 32.8N 39.8W mb=4.7 EMSC NORTHERN MID-ATLANTIC RIDGE

P: 21MAR2023 151792 32.0N 41.0W 4.0-5.8 BAAAA No. Mid-Atlantic Ridge

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

ZEALANDIA AND AUSTRALIA REGION

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

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

JAPAN AND KURIL ISLANDS

O: 25MAR2023 16:18:05 50.0N 156.6E mb=4.4 EMSC KURIL ISLANDS

P: 21MAR2023 151880 51.0N 158.0E 4.0-5.7 BAAAA Kamchatka

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 25MAR2023 10:53:57 29.9N 115.0W ML=3.7 EMSC BAJA CALIFORNIA, MEXICO

P: 26MAR2023 151799 30.2N 114.4W 2.0-4.4 AAAAA SW U.S.A

O: 25MAR2023 08:02:40 31.3N 115.3W ML=3.5 EMSC BAJA CALIFORNIA, MEXICO

O: 25MAR2023 07:33:16 31.4N 115.5W ML=3.2 EMSC BAJA CALIFORNIA, MEXICO

O: 25MAR2023 17:14:52 30.7N 116.2W ML=3.6 EMSC OFFSHORE BAJA CALIFORNIA, MEXICO

O: 25MAR2023 16:51:21 30.7N 116.2W ML=3.6 EMSC OFFSHORE BAJA CALIFORNIA, MEXI

P: 27MAR2023 151802 30.9N 116.3W 2.5-4.6 AAAAA So. California

O: 25MAR2023 22:14:07 31.8N 116.3W ML=3.3 EMSC BAJA CALIFORNIA, MEXICO

P: 23MAR2023 151803 32.0N 116.3W 2.5-4.7 AAAAA So. California

O: 25MAR2023 19:53:15 32.8N 117.0W Ml=2.1 EMSC SAN DIEGO CTY URBAN AREA, CALI

P: 23MAR2023 151804 32.9N 117.6W 2.5-4.6 AAAAA So. California

O: 26MAR2023 06:20:44 35.8N 116.9W ML=3.3 EMSC SOUTHERN CALIFORNIA

O: 26MAR2023 06:20:44 35.8N 116.9W ML=3.6 ANSS SOUTHERN CALIFORNIA

P: 25MAR2023 151810 35.1N 117.0W 2.5-4.8 AAAAA So. California

NEIC reported this earthquake of M 3.6 in Central California near Ridgecrest was felt with intensity II-III in the area(s) of Central California near Ridgecrest and in Lancaster, Crestline.

O: 26MAR2023 02:53:33 36.6N 121.1W Md=2.0 EMSC CENTRAL CALIFORNIA

P: 25MAR2023 151769 36.8N 121.3W 2.5-4.6 AAAAA Central California

O: 26MAR2023 04:05:49 38.8N 122.8W Md=2.4 EMSC NORTHERN CALIFORNIA

P: 24MAR2023 151771 38.8N 122.8W 2.5-4.6 AAAAA Central California

O: 25MAR2023 09:04:22 40.3N 125.3W ML=3.1 EMSC OFFSHORE NORTHERN CALIFORNIA

P: 26MAR2023 151852 40.6N 124.9W 2.5-4.5 AAAAA Off Coast of No. Calif

NEIC reported this earthquake of M 3.1 off the coast of Northern California was felt with intensity II-III in the area(s) of Northern California in Eureka, Arcata, Garberville, Willits, Martinez and Stockton.

ALASKA

O: 25MAR2023 20:27:14 51.9N 178.1W ML=3.0 EMSC ANDREANOF ISLANDS, ALEUTIAN IS

P: 27MAR2023 151872 51.7N 176.4W 3.5-5.1 AAAAA Andreanoff Isls, Aleutians

O: 26MAR2023 01:43:02 52.4N 168.2W mb=4.3 EMSC FOX ISLANDS, ALEUTIAN ISLANDS

P: 28MAR2023 151879 52.5N 169.2W 3.5-5.0 AAAAA Fox Islands, Aleutians

O: 26MAR2023 04:06:48 54.4N 159.7W ML=3.3 EMSC SOUTH OF ALASKA

P: 26MAR2023 151889 54.7N 161.2W 3.5-5.3 AAAAA Unimak Islands, Aleutians

O: 25MAR2023 14:55:18 61.3N 151.5W ML=3.0 EMSC SOUTHERN ALASKA

P: 23MAR2023 151898 61.3N 152.3W 3.2-5.1 AAAAA Central Alaska

O: 25MAR2023 07:54:14 62.2N 152.1W ML=3.4 EMSC CENTRAL ALASKA

P: 25MAR2023 151898 62.6N 151.4W 3.2-5.1 AAAAA Central Alaska

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

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

ROCKY MOUNTAINS REGION

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

EASTERN U.S./CANADA

O: 25MAR2023 15:05:16 28.7N 98.3W ML=2.9 EMSC SOUTHERN TEXAS

P: 27MAR2023 151754 28.0N 98.0W 3.0-4.7 AAAAA Northern Mexico

HAWAII

O: 26MAR2023 02:25:03 19.3N 155.2W ML=3.2 EMSC ISLAND OF HAWAII, HAWAII

P: 27MAR2023 151723 19.2N 155.2W 3.0-4.7 AAAAA Hawaii

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

MODERATE EARTHQUAKE IN TONGA ON ANOTHER QUIET DAY IN SEISMICITY

EARTHQUAKE SUMMARY FOR MARCH 24, 2023

It was another quiet day in global seismicity. This is likely to continue for several more days as seismic stress builds back following the unusual series of earthquakes on March 21-22 probably promoted by a strong GRB, geomagnetic storm and new moon. The only earthquake of M>=5 reported in the world today was an M 5.6 in Fiji.

This earthquake of M 5.6 in Central Tonga/Fiji was not reported felt in this remote area. It occurred near local solar midnight and was probably promoted by high tidal stresses which maximize near this hour. An M 4.4 about 150 km west of the mainshock occurred near local solar noon, another time when tidal stress maximizes. Forecast 151939 had expected this activity was likely around March 22, 2023.

O: 24MAR2023 13:01:34 20.3S 176.6W Mw=5.6 EMSC FIJI REGION

P: 22MAR2023 151939 20.0S 178.0W 4.0-5.4 AAAAA Tonga Islands

O: 24MAR2023 22:41:30 20.5S 178.1W mb=4.4 EMSC FIJI REGION

P: 22MAR2023 151939 20.0S 178.0W 4.0-5.4 AAAAA Tonga Islands

The strongest earthquake felt in the U.S. or Canada today was a light earthquake in Southern California near Borrego Springs of M 3.1-3.4. Earthquakes at this magnitude level in this area of Southern California are common. Today's M 3.4 follows similar earthquakes within about 50 km of this epicenter most recently on February 1, 2023 (M 3.1) an January 9 and 11, 2023 (M 3.2) but the last event in the area of larger magnitude was an M 4.2 on December 31, 2022. Forecast 141804 had expected today's epicenter would be active around March 26.

NEIC reported these earthquakes of M 2.9 and 3.4 in Borrego Springs, California were felt with intensity II-III in the area(s) of Borrego Springs, California in El Cajon, San Diego, Palm Desert, Julian, Descanso, Ramona, Alpine, Boulevard, Lakeside, Escondido and La Quinta.

O: 24MAR2023 13:59:00 33.2N 116.4W Ml=2.3 EMSC SOUTHERN CALIFORNIA

O: 24MAR2023 15:04:04 33.2N 116.4W ML=2.9 EMSC SOUTHERN CALIFORNIA

O: 24MAR2023 13:45:13 33.2N 116.4W ML=3.1 EMSC SOUTHERN CALIFORNIA

O: 24MAR2023 13:45:13 33.2N 116.4W ML=3.4 ANSS SOUTHERN CALIFORNIA

P: 26MAR2023 151804 33.4N 116.7W 2.5-4.6 AAAAA So. California

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 24MAR2023 10:04:18 23.7N 121.3E ML=4.2 EMSC TAIWAN

O: 24MAR2023 10:04:18 23.7N 121.3E ML=4.2 TAI Hualien, Taiwan

P: 24MAR2023 151760 23.0N 122.0E 4.0-5.4 AAAAA Taiwan

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

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

INDONESIA AND PHILIPPINES

O: 24MAR2023 14:26:44 2.3S 139.0E ML=4.6 EMSC NEAR N COAST OF PAPUA, INDONES

O: 24MAR2023 09:26:32 2.6S 138.9E mb=4.7 EMSC PAPUA, INDONESIA

P: 21MAR2023 151711 1.0S 137.0E 4.0-5.6 BBBAA West Irian, PNG

O: 25MAR2023 06:23:47 2.7N 125.9E ML=4.5 EMSC KEPULAUAN SANGIHE, INDONESIA

P: 31MAR2023 151682 2.0N 127.0E 4.0-5.5 CAAAA Halmahera

O: 24MAR2023 23:59:22 6.5N 126.0E ML=4.5 EMSC MINDANAO, PHILIPPINES

P: 26MAR2023 151686 6.0N 125.0E 4.0-5.5 AAAAA Mindanao, Philippines

O: 24MAR2023 11:32:38 7.1S 126.0E mb=4.5 EMSC KEPULAUAN BARAT DAYA, INDONESI

P: 31MAR2023 151691 8.0S 125.0E 4.0-5.7 CAAAA Banda Sea

O: 24MAR2023 14:11:36 10.8S 113.3E ML=4.3 EMSC SOUTH OF JAVA, INDONESIA

O: 24MAR2023 12:16:12 10.9S 113.3E mb=4.6 EMSC SOUTH OF JAVA, INDONESIA

P: 21MAR2023 151706 9.0S 114.0E 4.0-5.6 BBAAA So. of Bali

O: 24MAR2023 15:13:22 14.5N 123.1E ML=4.4 EMSC LUZON, PHILIPPINES

P: 25MAR2023 151727 14.0N 122.0E 3.5-5.0 AAAAA Luzon, Philippines

CENTRAL AND SOUTH AMERICA

O: 24MAR2023 07:13:38 11.5S 73.3W ML=4.0 EMSC CENTRAL PERU

P: 24MAR2023 151912 15.0S 73.0W 4.0-5.5 ACAAA Central Peru

O: 25MAR2023 01:42:13 13.0N 61.2W ML=3.4 EMSC ST. VINCENT REGION, WINDWARD I

P: 27MAR2023 151743 11.0N 63.0W 3.4-5.1 ABBAA Windward Islands

NEIC reported this earthquake of M 3.4 in Saint Vincent and the Grenadines was felt with intensity II-III in the area(s) of Stint Vincent and The Grenadines at Port Elizabeth, Hamilton, Kingstown and the Netherlands Antilles.

O: 24MAR2023 14:01:21 13.7N 90.5W mb=4.2 EMSC OFFSHORE GUATEMALA

P: 24MAR2023 151722 13.0N 90.0W 3.5-5.1 AAAAA Guatemala

O: 24MAR2023 22:34:25 15.0N 94.2W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO

P: 25MAR2023 151719 16.0N 95.0W 3.5-5.5 AAAAA Chiapas, Mexico

O: 24MAR2023 09:44:57 15.5N 93.4W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO

P: 26MAR2023 151722 15.0N 92.0W 3.5-5.1 AABAA Guatemala

O: 24MAR2023 08:30:18 16.0N 95.9W ML=4.1 EMSC OAXACA, MEXICO

O: 24MAR2023 14:41:45 16.1N 96.2W mb=4.3 EMSC OAXACA, MEXICO

P: 24MAR2023 151735 15.0N 96.0W 3.5-5.4 ABAAA Oaxaca, Mexico

NEIC reported this earthquake of M 4.3 in Oaxaca, Mexico was felt with intensity II-III in the area(s) of Oaxaca, Mexico in Cacaotepec.

O: 24MAR2023 07:10:36 16.8N 99.4W ML=4.0 EMSC GUERRERO, MEXICO

P: 23MAR2023 151736 17.0N 99.0W 3.5-5.6 AAAAA Oaxaca, Mexico

O: 25MAR2023 03:27:35 17.9N 100.7W ML=4.0 EMSC GUERRERO, MEXICO

P: 27MAR2023 151730 17.0N 101.0W 3.5-5.6 AAAAA Michoacan, Mexico

O: 24MAR2023 07:40:38 18.0N 66.2W Md=3.0 EMSC PUERTO RICO

P: 25MAR2023 151737 18.0N 66.0W 3.4-5.4 AAAAA Puerto Rico

O: 24MAR2023 21:27:57 18.3N 102.6W ML=4.2 EMSC MICHOACAN, MEXICO

P: 21MAR2023 151731 18.0N 102.0W 3.5-5.6 BAAAA Michoacan, Mexico

O: 24MAR2023 22:03:35 18.4N 73.5W ML=3.9 EMSC HAITI REGION

P: 25MAR2023 151739 19.0N 73.0W 3.4-5.4 AAAAA Puerto Rico

O: 24MAR2023 20:08:41 19.0N 65.2W Md=3.4 EMSC VIRGIN ISLANDS REGION

P: 22MAR2023 151744 20.0N 66.0W 3.0-5.0 AAAAA Bahamas/No. Caribbean

P: 29MAR2023 151725 19.0N 65.0W 3.0-5.3 BAAAA Leeward Islands

O: 25MAR2023 01:04:48 22.4S 69.1W ML=3.9 EMSC ANTOFAGASTA, CHILE

P: 27MAR2023 151932 22.0S 69.0W 4.0-6.0 AAAAA Coast No. Chile

AFRICA AND EUROPE

O: 24MAR2023 13:10:34 38.0N 37.6E mb=4.4 EMSC CENTRAL TURKEY

O: 24MAR2023 13:51:24 38.0N 36.3E ML=4.0 EMSC CENTRAL TURKEY

O: 25MAR2023 04:39:32 38.1N 37.0E ML=4.4 EMSC CENTRAL TURKEY

O: 25MAR2023 06:33:40 37.9N 36.3E ML=4.1 EMSC CENTRAL TURKEY

P: 23MAR2023 151820 38.0N 36.0E 3.5-5.1 AAAAA Turkey

O: 24MAR2023 07:09:57 40.9N 48.2E ML=4.2 EMSC AZERBAIJAN

P: 27MAR2023 151835 40.0N 50.0E 4.0-5.8 BABAA Kazakhstan

SOUTHWEST PACIFIC

O: 24MAR2023 13:01:34 20.3S 176.6W Mw=5.6 EMSC FIJI REGION

P: 22MAR2023 151939 20.0S 178.0W 4.0-5.4 AAAAA Tonga Islands

O: 24MAR2023 22:41:30 20.5S 178.1W mb=4.4 EMSC FIJI REGION

P: 22MAR2023 151939 20.0S 178.0W 4.0-5.4 AAAAA Tonga Islands

OCEAN RIDGES

O: 24MAR2023 18:27:40 32.8N 39.8W mb=4.5 EMSC NORTHERN MID-ATLANTIC RIDGE

P: 21MAR2023 151792 32.0N 41.0W 4.0-5.8 BAAAA No. Mid-Atlantic Ridge

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

ZEALANDIA AND AUSTRALIA REGION

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

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

JAPAN AND KURIL ISLANDS

O: 24MAR2023 07:25:34 36.4N 140.3E Mw=4.7 EMSC NEAR EAST COAST OF HONSHU, JAP

O: 24MAR2023 08:20:30 37.8N 141.8E ML=4.2 EMSC NEAR EAST COAST OF HONSHU, JAP

P: 23MAR2023 151790 37.0N 139.0E 3.5-4.9 AAAAA No. Honshu, Japan

NEIC reported this earthquake of M 4.7 in Eastern Honshu, Japan was felt with intensity II-III in the area(s) of Eastern Honshu, Japan in Ibaraki and Saitama (IV) and in Tokyo.

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 24MAR2023 13:59:00 33.2N 116.4W Ml=2.3 EMSC SOUTHERN CALIFORNIA

O: 24MAR2023 15:04:04 33.2N 116.4W ML=2.9 EMSC SOUTHERN CALIFORNIA

O: 24MAR2023 13:45:13 33.2N 116.4W ML=3.1 EMSC SOUTHERN CALIFORNIA

P: 26MAR2023 151804 33.4N 116.7W 2.5-4.6 AAAAA So. California

O: 24MAR2023 09:49:09 34.4N 119.7W ML=2.2 EMSC SOUTHERN CALIFORNIA

P: 24MAR2023 151809 34.7N 119.0W 2.5-4.6 AAAAA So. California

O: 25MAR2023 04:32:10 35.5N 118.5W ML=2.6 EMSC CENTRAL CALIFORNIA

O: 25MAR2023 04:32:10 35.5N 118.5W ML=2.9 ANSS CENTRAL CALIFORNIA

P: 27MAR2023 151811 35.4N 118.5W 2.5-4.8 AAAAA 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 Bodfish and Caliente.

O: 24MAR2023 07:50:34 37.3N 115.1W ml=2.2 EMSC NEVADA

P: 27MAR2023 151786 37.3N 114.9W 2.5-4.9 BAAAA Nevada area

O: 24MAR2023 07:46:09 38.4N 122.6W ML=2.4 EMSC NORTHERN CALIFORNIA

O: 24MAR2023 07:46:09 38.4N 122.6W ML=2.6 ANSS NORTHERN CALIFORNIA

O: 24MAR2023 13:02:01 38.4N 122.6W Md=2.0 EMSC NORTHERN CALIFORNIA

P: 26MAR2023 151771 38.5N 122.7W 2.5-4.6 AAAAA Central California

NEIC reported this earthquake of M 2.6 in Santa Rosa, Northern California was felt with intensity II-III in the area(s) of Santa Rosa, Northern California in Rohnert Park, Cotati, Sebastopol. Petaluma.

ALASKA

O: 24MAR2023 20:47:34 52.2N 170.4W ML=3.5 EMSC FOX ISLANDS, ALEUTIAN ISLANDS

P: 28MAR2023 151879 52.5N 169.2W 3.5-5.0 BAAAA Fox Islands, Aleutians

O: 25MAR2023 01:48:07 54.3N 159.8W ML=3.0 EMSC SOUTH OF ALASKA

P: 26MAR2023 151889 54.7N 161.2W 3.5-5.3 AAAAA Unimak Islands, Aleutians

O: 24MAR2023 20:23:20 60.1N 151.6W ML=3.2 EMSC KENAI PENINSULA, ALASKA

P: 23MAR2023 151898 61.3N 152.3W 3.2-5.1 BAAAA 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 Kasilof.

O: 24MAR2023 15:43:37 62.3N 151.0W ML=3.0 EMSC CENTRAL ALASKA

P: 25MAR2023 151898 62.6N 151.4W 3.2-5.1 AAAAA Central Alaska

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

O: 24MAR2023 20:16:36 47.2N 118.3W Ml=2.0 EMSC WASHINGTON

O: 24MAR2023 18:44:42 47.4N 117.9W Ml=2.2 EMSC WASHINGTON

P: 30MAR2023 151841 47.7N 117.4W 2.0-4.3 AAAAA Montana/Idaho

O: 24MAR2023 08:45:10 47.5N 123.0W Ml=2.4 EMSC PUGET SOUND REGION, WASHINGTON

P: 24MAR2023 151866 46.9N 122.0W 2.0-3.9 AAAAA Washington state, U.S.

ROCKY MOUNTAINS REGION

O: 24MAR2023 16:19:28 31.7N 104.4W ML=2.3 EMSC WESTERN TEXAS

O: 24MAR2023 20:22:08 31.7N 104.2W ML=2.3 EMSC WESTERN TEXAS

O: 24MAR2023 12:15:07 31.7N 104.3W ML=2.3 EMSC WESTERN TEXAS

P: 24MAR2023 151800 31.5N 103.6W 2.0-3.9 AAAAA SW U.S.A

O: 24MAR2023 16:50:36 32.1N 102.7W ML=2.0 EMSC WESTERN TEXAS

P: 26MAR2023 151800 31.5N 101.6W 2.0-3.9 AAAAA SW U.S.A

EASTERN U.S./CANADA

O: 24MAR2023 13:43:51 36.4N 96.9W ML=2.2 EMSC OKLAHOMA

P: 25MAR2023 151817 36.0N 97.0W 2.0-4.4 AAAAA Southern Plains

HAWAII

O: 24MAR2023 11:53:01 19.3N 155.4W ML=3.0 EMSC ISLAND OF HAWAII, HAWAII

P: 27MAR2023 151723 19.2N 155.2W 3.0-4.7 BAAAA Hawaii

QUIET SEISMICITY RETURNS AFTER SEISMIC STRESS RELIEVED IN PREVIOUS DAYS

EARTHQUAKE SUMMARY FOR MARCH 23, 2023

Global seismicity quickly returned to quiet conditions today after most seismic strain was used up in the firestorm of seismicity yesterday with the beginning of the geomagnetic storm and the new moon as described in the previous issue of this summary:

"A series of events today appear to have helped ignite an equally surprising series of moderately large to large earthquakes around the world turning the daily earthquake map red. This activity included events of M 6.5 in Argentina followed by an M 5.9 in Tajikistan; an M 5.7 in Papua New Guinea; an M 5.6 in the northern Philippines; an M 5.6 in Northern Honshu, Japan; an M 5.5 in the Kermadec Islands. Unusual events in the France-Switzerland border (M 4.2) and in southern Australia (M 4.9) were among a number of other notable earthquakes today." (March 24, 2023)

"The strongest and only moderate to moderately large earthquake in the world today was an M 5.6 hit the Turkey-Iran Border region today. NEIC reported it was felt strongly in Iran with intensity VI in Khoi, Sahbuz, Dilman, Azerbaijan; IV in Merand, Azar and Tebriz and II-III in Alamdar and Orumiyeh among others.

This is the largest earthquake along the Turkey-Iran border within about 150 km of this epicenter since an M 5.8 and 5.9 in January, 2023. At the time this summary noted in this regard:

“The strongest earthquake in the world today was a strong M 5.9 near the Turkey-Iran border in the area of Azerbaijan. NEIC reported it was felt with damage with intensity VIII in Azerbaijan, Iran in Khoi, Dilman; V in Tebriz, IV inOrumiyeh, Ardakan, Yaed, Chalus, Mazandaran and II in Merand with intensity IV in Yerevan, Armenia. Iranian state media reported some homes were destroyed and that the "amount of destruction of some houses and buildings in the city of Khoy is relative high". News reported at least 300 injured including 122 in the city of Khoy - a toll which included three deaths. Emergency teams were dispatched to the area which was in the midst of a strong winter storm with sub-zero temperatures and power outages at the time of the earthquake. This event appears to continue enhanced seismicity with strong tidal stresses associated with the new moon of January 21 as it occurred near the longitude of maximum tidal stress with that alignment as defined in previous issues of this summary:

The last earthquale of M 5.9 within about 200 km of today's mainshock was an

M 6.0 on February 23, 2020. The only other event of M>=5.9 in this region in the past 35 years was an M 7.1 on October 23, 2011. At the time of the M 6.0 in February, 2020 this summary noted:

"This area of Turkey-Iran border first became active on February 16, 2020 with an M 4.8 foreshock. The last earthquake within about 200 km of today's M 6.0 with equal or larger magnitude occurred on August 11, 2012 with M 6.3 and 6.4 about 200 km east of today's epicenter. The only other such event in the region in the past 30 years was an M 7.1-7.3 on October 23, 2011." (February 24, 2020)

Today’s epicenter is located at 144 degrees from the M 7.0 in the Kermadec Islands and at similar distance from other recent major quakes in Tonga and Fiji and was probably promoted by energy from those sources.

Forecasts 151538 and 151821 had expected today' event was likely in mid-March.

O: 24MAR2023 03:16:57 38.4N 44.9E Mw=5.6 EMSC TURKEY-IRAN BORDER REGION

P: 16MAR2023 151538 38.0N 44.0E 3.5-5.4 CAAAA Turkey

P: 25MAR2023 151821 38.0N 43.0E 3.5-5.1 AABAA Turkey

A series of moderate earthquakes also occurred today near local solar noon and local solar midnight in the region of the Izu Islands, Japan. They were not

reported felt in this remote area south of Honshu, Japan. The M 5.4 is this strongest

event within about 200 km of these epicenter in the Izu Islands since an M 5.8 on February 5, 2023. Forecast 151794 had expected this activity was likely around March 23, 2023. This epicenter is at the fifth node (72 degrees) from the M 7.0 in the Kermadec Islands of March 16, 2023 at the seventh node (51 degrees) from the M 7.0 in Vanuatu of January 8 and may have been promoted by energy from those sources.

O: 24MAR2023 04:25:27 30.0N 142.0E Mw=5.4 EMSC IZU ISLANDS, JAPAN REGION

O: 24MAR2023 04:37:10 30.0N 141.9E mb=4.7 EMSC IZU ISLANDS, JAPAN REGION

O: 24MAR2023 04:38:09 30.0N 141.9E mb=5.0 EMSC IZU ISLANDS, JAPAN REGION

O: 23MAR2023 18:36:42 30.0N 142.0E mb=4.6 EMSC IZU ISLANDS, JAPAN REGION

P: 23MAR2023 151794 31.0N 142.0E 4.0-5.4 AAAAA Off East Coast Honshu

A light to moderate earthquake of M 3.9-4.2 was felt widely in Hawaii today. NEIC reported intensity II-III in Hawaii at Hawaii National Park, Hilo, Volcano, Paauilo, Mountain View, Captain Cook, Papaikou, Kakalau, Pahoa and Pepeekeo. The last earthquake in Hawaii of M>=4.2 was an M 4.8 on February 15, 2023.

At the time this summary noted:

"The M 4.5-4.8 in Hawaii was felt throughout the big island. NEIC reported maximum intensity V in Naalehu with IV in Volcano, Captain Cook, Pahoa, Mountain View with III in Hawaii National Park, Hilo, Holualoa and Kurtistown among others. The mainshock was preceded by an M 3.7 which was felt with intensity III in Naalehu and Captain Cook. This is the strongest earthquake in Hawaii since an M 5.0 on October 14, 2022 and prior to that an M 6.2 south of Hawaii on October 10, 2021." (February 15, 2023)

Forecast 151723 had expected enhanced seismicity in Hawaii around March 24.

O: 24MAR2023 03:04:00 19.5N 155.5W ML=4.2 EMSC ISLAND OF HAWAII, HAWAII

P: 24MAR2023 151723 19.9N 156.1W 3.0-4.7 AAAAA Hawaii

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 23MAR2023 10:26:48 21.7N 100.5E ML=4.5 EMSC MYANMAR-CHINA BORDER REGION

P: 23MAR2023 151753 26.0N 101.0E 4.0-5.6 ACAAA Myanmar

O: 23MAR2023 13:21:09 24.3N 94.3E ML=3.8 EMSC MYANMAR-INDIA BORDER REGION

O: 24MAR2023 03:22:40 24.2N 93.9E ML=3.9 EMSC MANIPUR, INDIA REGION

P: 23MAR2023 151752 25.0N 95.0E 4.0-5.4 AAAAA Myanmar

O: 24MAR2023 05:01:49 26.0N 78.3E ML=4.0 EMSC MADHYA PRADESH REGION, INDIA

P: 22MAR2023 151824 30.0N 82.0E 3.8-5.2 ACCAA Xizang

O: 23MAR2023 08:44:28 28.9N 97.0E ML=4.2 EMSC EASTERN XIZANG-INDIA BORDER RE

P: 21MAR2023 151753 27.0N 97.0E 4.0-5.5 ABAAA Myanmar

O: 24MAR2023 04:06:24 29.6N 81.8E mb=4.2 EMSC NEPAL

P: 22MAR2023 151824 30.0N 82.0E 3.8-5.2 AAAAA Xizang

O: 23MAR2023 11:38:07 33.3N 72.6E ML=3.9 EMSC PAKISTAN

P: 20MAR2023 151512 33.0N 74.0E 3.8-5.6 BAAAA Pakistan

O: 23MAR2023 07:18:18 36.3N 71.2E mb=4.3 EMSC HINDU KUSH REGION, AFGHANISTAN

P: 27MAR2023 151779 36.0N 71.0E 3.8-5.4 BAAAA Hindu Kush/Pakistan

O: 23MAR2023 10:36:23 51.4N 159.9E mb=4.0 EMSC OFF EAST COAST OF KAMCHATKA

O: 23MAR2023 10:38:40 51.4N 160.0E mb=4.2 EMSC OFF EAST COAST OF KAMCHATKA

P: 27MAR2023 151880 52.0N 159.0E 4.0-5.9 BAAAA Kamchatka

INDONESIA AND PHILIPPINES

O: 23MAR2023 08:36:47 3.9S 133.5E ML=4.1 EMSC PAPUA, INDONESIA

P: 25MAR2023 151712 2.0S 134.0E 4.0-5.4 ABAAA West Irian, PNG

O: 24MAR2023 02:38:52 7.1S 125.7E mb=4.8 EMSC KEPULAUAN BARAT DAYA, INDONESI

P: 24MAR2023 151690 6.0S 125.0E 4.0-5.4 ABAAA Banda Sea

P: 24MAR2023 151696 8.0S 124.0E 4.0-5.4 AABAA Flores Island area

O: 23MAR2023 11:21:29 7.8S 126.6E ML=4.4 EMSC KEPULAUAN BARAT DAYA, INDONESIA

O: 23MAR2023 07:56:38 7.7S 127.9E mb=4.8 EMSC KEPULAUAN BARAT DAYA, INDONESI

P: 30MAR2023 151691 8.0S 129.0E 4.0-5.4 CAAAA Banda Sea

O: 23MAR2023 08:51:56 9.9S 116.1E ML=4.0 EMSC LOMBOK REGION, INDONESIA

P: 18MAR2023 151635 10.0S 116.0E 4.0-5.4 BAAAA Sumbawa Island area

CENTRAL AND SOUTH AMERICA

O: 23MAR2023 17:50:36 11.5S 73.3W ML=4.1 EMSC CENTRAL PERU

P: 24MAR2023 151912 15.0S 73.0W 4.0-5.5 ACAAA Central Peru

O: 24MAR2023 04:28:36 18.8N 71.1W ML=3.8 EMSC DOMINICAN REPUBLIC

P: 23MAR2023 151739 19.0N 71.0W 3.4-5.5 AAAAA Puerto Rico

O: 24MAR2023 04:36:09 19.2N 66.6W Md=3.7 EMSC PUERTO RICO REGION

P: 22MAR2023 151744 20.0N 66.0W 3.0-5.0 AAAAA Bahamas/No. Caribbean

O: 24MAR2023 05:03:36 19.5N 70.6W ML=3.0 EMSC DOMINICAN REPUBLIC

P: 23MAR2023 151739 19.0N 71.0W 3.4-5.5 AAAAA Puerto Rico

O: 24MAR2023 04:33:25 23.0S 66.6W mb=4.3 EMSC JUJUY, ARGENTINA

P: 22MAR2023 151930 24.0S 66.0W 4.0-5.9 AAAAA Argentina

O: 22MAR2023 16:00 23.5S 66.7W mb=6.5 GUC Antofagasta at Antofagasta, V

O: 22MAR2023 15:18 23.5S 66.7W mb=5.3 GUC Argentina

P: 22MAR2023 151930 24.0S 66.0W 4.0-5.9 AAAAA Argentina

GUC reported this earthquake of M 6.5 was felt with intensity VI in Antofagasta at Antofagasta, V in Mejillones, Maria Elena, Tocopilla, Sierra Gorda, Calama; III in Taltal; IV in Atacama at Chanaral, Diego de Almagro, El Salvador, III in Caldera, Copiapo, Tierra Amarilla; in Tarapaca with IV in Iquique, Alto Hospicio, El Loa, Huara, Pozo Almonte; III in La Tirana, Pica and II in Camina; in Arica and Parinacota with IV in Cuya, II in Arica, Chile.

O: 24MAR2023 06:13:24 30.1S 71.3W ML=4.1 EMSC COQUIMBO, CHILE

O: 24MAR2023 06:13 30.1S 71.3W mb=4.1 GUC Coquimbo at La Higuera; III in

P: 23MAR2023 151944 30.0S 71.0W 4.0-5.5 AAAAA Coast Central Chile

GUC reported this earthquake was felt with intensity IV in Coquimbo at La Higuera; III in Monte Patria, Ovalle, Andacollo, La Serean, Vicuna, Chile.

O: 23MAR2023 21:24:11 36.7S 70.3W Mw=4.5 EMSC NEUQUEN, ARGENTINA

P: 24MAR2023 151947 37.0S 70.0W 4.0-5.6 AAAAA Central Chile

AFRICA AND EUROPE

O: 23MAR2023 10:04:56 38.0N 36.5E ML=4.2 EMSC CENTRAL TURKEY

O: 24MAR2023 00:39:55 38.0N 36.4E Mw=4.6 EMSC CENTRAL TURKEY

O: 23MAR2023 09:19:52 38.0N 36.4E mb=4.9 EMSC CENTRAL TURKEY

P: 23MAR2023 151820 38.0N 36.0E 3.5-5.1 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 Kayseri, Gaziantep (IV), Adana, Urfa.

O: 24MAR2023 03:16:57 38.4N 44.9E Mw=5.6 EMSC TURKEY-IRAN BORDER REGION

P: 16MAR2023 151538 38.0N 44.0E 3.5-5.4 CAAAA Turkey

P: 25MAR2023 151821 38.0N 43.0E 3.5-5.1 AABAA Turkey

SOUTHWEST PACIFIC

O: 24MAR2023 05:32:02 15.4S 175.0W mb=4.2 EMSC TONGA

P: 24MAR2023 151915 15.0S 173.0W 4.0-5.6 AABAA Samoa Islands

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

OCEAN RIDGES

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

ZEALANDIA AND AUSTRALIA REGION

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

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

JAPAN AND KURIL ISLANDS

O: 24MAR2023 04:25:27 30.0N 142.0E Mw=5.4 EMSC IZU ISLANDS, JAPAN REGION

O: 24MAR2023 04:37:10 30.0N 141.9E mb=4.7 EMSC IZU ISLANDS, JAPAN REGION

O: 24MAR2023 04:38:09 30.0N 141.9E mb=5.0 EMSC IZU ISLANDS, JAPAN REGION

O: 23MAR2023 18:36:42 30.0N 142.0E mb=4.6 EMSC IZU ISLANDS, JAPAN REGION

P: 23MAR2023 151794 31.0N 142.0E 4.0-5.4 AAAAA Off East Coast Honshu

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 23MAR2023 10:05:52 31.5N 116.0W ML=3.4 EMSC BAJA CALIFORNIA, MEXICO

O: 23MAR2023 09:53:00 31.1N 116.7W Ml=3.9 EMSC OFFSHORE BAJA CALIFORNIA, MEXI

P: 22MAR2023 151802 30.8N 116.3W 2.5-4.6 AAAAA So. California

O: 24MAR2023 05:20:06 33.9N 118.7W ML=2.4 EMSC CHANNEL ISLANDS REG., CALIFORN

P: 22MAR2023 151806 34.0N 118.7W 2.5-4.7 AAAAA So. California

O: 24MAR2023 00:30:20 35.5N 117.4W ML=3.0 EMSC SOUTHERN CALIFORNIA

P: 20MAR2023 151526 35.0N 117.7W 2.5-4.9 BAAAA So. California

NEIC reported this earthquake of M 3.1 in Ridgecrest, Central California was felt with intensity II-III in the area(s) of Ridgecrest, Central California.

O: 23MAR2023 09:50:11 35.5N 118.4W Ml=2.0 EMSC CENTRAL CALIFORNIA

P: 22MAR2023 151811 35.6N 118.4W 2.5-4.7 AAAAA So. California

ALASKA

O: 23MAR2023 11:21:02 58.1N 138.2W ml=3.0 EMSC SOUTHEASTERN ALASKA

P: 22MAR2023 151887 57.0N 138.0W 3.0-4.4 ABAAA Southeast Alaska

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

O: 23MAR2023 11:13:15 48.5N 123.2W Ml=2.6 EMSC VANCOUVER ISLAND, CANADA REGIO

P: 25MAR2023 151867 48.4N 123.2W 2.0-3.9 AAAAA Washington state, U.S.

NEIC reported this earthquake of M 2.6 in Vancouver, British Columbia was felt with intensity II-III in the area(s) of Vancouver, British Columbia in Victoria, Sidney, Sooke, and in Washington State in Friday Harbor, Eastsound, and Camano Island.

O: 23MAR2023 11:13:14 48.5N 123.2W MB=2.4 ECAN of Victoria, BC

P: 25MAR2023 151867 48.4N 123.2W 2.0-3.9 AAAAA Washington state, U.S.

ROCKY MOUNTAINS REGION

O: 23MAR2023 09:27:27 37.0N 112.9W Ml=2.0 EMSC UTAH

P: 24MAR2023 151822 38.6N 112.7W 2.0-4.4 ABAAA Utah area

EASTERN U.S./CANADA

O: 23MAR2023 12:37:00 36.8N 98.6W ML=2.2 EMSC OKLAHOMA

O: 23MAR2023 12:24:04 36.8N 98.5W ML=2.1 EMSC OKLAHOMA

P: 25MAR2023 151817 36.0N 97.0W 2.0-4.4 AABAA Southern Plains

HAWAII

O: 24MAR2023 03:04:00 19.5N 155.5W ML=4.2 EMSC ISLAND OF HAWAII, HAWAII

P: 24MAR2023 151723 19.9N 156.1W 3.0-4.7 AAAAA Hawaii

NEW MOON; GEOMAGNETIC STORM; GRB IGNITE GLOBAL SEISMICITY FIRESTORM

EARTHQUAKE SUMMARY FOR MARCH 22, 2023

A series of events today appear to have helped ignite an equally surprising series of moderately large to large earthquakes around the world turning the daily earthquake map red. This activity included events of M 6.5 in Argentina followed by an M 5.9 in Tajikistan; an M 5.7 in Papua New Guinea; an M 5.6 in the northern Philippines; an M 5.6 in Northern Honshu, Japan; an M 5.5 in the Kermadec Islands. Unusual events in the France-Switzerland border (M 4.2) and in southern Australia (M 4.9) were among a number of other notable earthquakes today. The Gamma Ray Burst, the strongest in the past three weeks was described in this summary as:

"A strong Gamma Ray Burst was recorded today. GRB 230233B occurred at 21:10:37 with UVOT magnitude greater than 18.3, the strongest GRB since February 28.

This GRB coincided with an M 2.3 in the San Francisco Bay, California area also at 21:10 near local solar noon. Earthquakes of M 5.6 in Northern Philippines and M 5.7 in New Guinea and M 4.9 in Albania followed in the several hours after this GRB." (March 22, 2023)

While tidal triggering of seismicity had been expected in this and previous issues of this summary with this new moon as:

"The new moon will arrive on March 21, 2023 at 17:23 UT. Longitudes which are sub-solar (local solar noon) are near 83 West longitude while those at local solar midnight are centered near 97 East longitude. In the west these include area of Central and northwestern South America and eastern U.S. and in the east areas of western Indonesia, Myanmar, and eastern China. These areas are most likely to see tidal triggering with this new moon. A moderately large to large tidally triggered earthquake is considered moderately likely with this new moon." (March 17-21, 2023)

Furthermore the strong geomagnetic storm which began today is the strongest since AP reached 94 on February 27 and peaked at high latitudes with KP 7 at about 12-15:0 UT today as noted in the "EXTERNAL EFFECTS" section of this summary:

"The geomagnetic field saw active conditions today. The AP level was 14. High latitudes saw major storm periods with AP 38. Middle latitudes were also at active conditions with AP 17. This is the strongest storm at high latitudes since A reached 41 on March 5 and 88 on February 27 and is expected to reach levels higher than at planetary levels in the next day. This is likely to promote enhanced seismicity throughout the world at this time but especially near the geomagnetic equator and at high latitudes." (March 22, 2023)

An unusual earthquake of M 4.9 occurred today off the southern coast of South Australia. NEIC reported it was felt with intensity IV in South Australia at Port Pirir and II-III in Whyalla, Gawler, Adelaide and Crafers-Bridgewater, Australia. The only earthquake with equal or larger magnitude within about 400 km of this epicenter in the past 35 years was a similar M 4.9 on October 8, 2021 about 400 km to the southeast of today's epicenter. At the time this summary noted:

"An unusual earthquake of M 4.9 occurred in Victoria, Australia today. NEIC reported it was felt with intensity II-III in Victoria and South Australia at Murray Bridge, Horsham, Midua, Moujnt Barker, Victor Harbor, Adelaide, Mount Gambler, Swan Hill, Hamilton and Maryborough. This is the strongest earthquake within about 300 km of this epicenter in at least 30 years. An M 4.8 hit the area on October 27, 2001 and about 400 km northwest of this on May 3, 1997, the only similar quakes in Victoria since 1990." (October 8, 2021)

Today's event in Australia occurred shortly after the Gamma Ray Burst of 21:00 UT and may have been promoted by effects related to this as well as the strong geomagnetic storm and high tidal stresses with the new moon.

O: 22MAR2023 23:23:09 32.8S 139.6E mb=4.9 EMSC NEAR COAST OF SOUTH AUSTRALIA

The strongest earthquake in the world today was an M 6.5 at an intermediate depth under Jujuy, Argentina. NEIC reported it was felt with maximum intensity IV in Calama, Antofagasta, Chile and II-III in Antofagasta, Iquique, in Brazil at Dorados Mato Grosso do Sul, Catalao and Diadema, Sao Paulo and in Jujuy and Salta, Argentina. A foreshock hit the same region about an hour before the mainshock with M 5.3. NEIC reported it was felt in Argentina at Jujuy and Salta and in Antofagasta, Chile. This earthquake occurred within minutes of local solar noon and was probably promoted by strong tidal stresses which maximize near this hour. A foreshock of M 5.3 occurred about half an hour earlier than the mainshock. The mainshock also occurred near the maximum of solar flare 6550 which had its maximum SFE at this longitude. It is also near the maximum effect longitude of the new moon and was likely promoted that alignment. The last earthquake of M>=6.4 within about 200 km of this epicenter occurred on May 10, 2022 with M 6.8. It was also associated with the new moon and a strong geomagnetic disturbance. At the time this summary noted:

"Today's M 6.8 in Argentina is the strongest earthquake within about 200 km of this epicenter since an M 7.2 near this epicenter on May 12, 2000, 22 years ago. An M 7.0 also occurred about 100 km north of this on May 24, 1993." (May 10, 2022)

Forecast 151930 had expected today's event within about 50 km was likely around March 22, 2023. This event is at 144 degrees from the M 7.6 in the Banda Sea of January 9 and the M 7.2 in Tajikistan of February 23, 2023 and may have been promoted by energy from those sources.

O: 22MAR2023 16:00:33 23.6S 66.6W Mw=6.4 EMSC JUJUY, ARGENTINA

O: 22MAR2023 15:18:49 23.6S 66.5W Mw=5.3 EMSC JUJUY, ARGENTINA

P: 22MAR2023 151930 24.0S 66.0W 4.0-5.9 AAAAA Argentina

An M 5.9 also occurred in Tajikistan today. NEIC reported it was felt with intensity V in Choruh-Dairon, Tajikistan with maximum intensity VI in Sulukfu, Os, Kyrgyzstan with IV in Khujand, Matcha, Kofarnihon, Dushanbe, Navabadski, Tajikistan and III in Bekobod, Taskent, Uzbekistan. NEIC reported the aftershock of M 4.5 in Tajikistan was felt with intensity II-III in the area(s) of Uzbekistan at Tashkent and Salor. While this epicenter is about 400 km northwest of the 7.2 in Tajikistan of February 23, 2023, it is likely related to regional stress redistribution related to that mainshock. The M 5.8 occurred within about an hour of local solar midnight and was probably also promoted by strong tidal, geomagnetic and GRB effects which maximized near this hour. Forecast 151780 had expected this earthquake within about 100 km was likely around March 26, 2023. This epicenter is located at 104 degrees from the M 7.0 in Vanuatu of January 8 and may have been promoted by energy from that source.

O: 23MAR2023 02:53:50 39.4N 69.7E mb=4.5 EMSC TAJIKISTAN

O: 23MAR2023 01:52:57 39.2N 69.8E ML=4.2 EMSC TAJIKISTAN

O: 22MAR2023 20:07:45 39.5N 70.0E mb=5.8 EMSC TAJIKISTAN

P: 26MAR2023 151780 39.0N 71.0E 3.8-5.6 BAAAA Hindu Kush/Pakistan

An M 5.7 occurred off the northern Coast of Papua New Guinea today. NEIC reported it was felt with maximum intensity IV in Papua New Guinea in Madang and II-III in Angoram, Laiagam, and Mount Hagen. The last earthquake within about 200 km of this epicenter with M>=5.7 was an M 6.1 on April 27, 2021. The last within about 100 km was an M 6.5 on November 7, 2017. Forecasts 151705 and 151701 had expected today's activity in New Guinea was likely within about 100 km of this epicenter around March 24-28.

O: 23MAR2023 00:17:39 4.4S 144.2E Mw=5.7 EMSC NEAR N COAST OF NEW GUINEA, PN

P: 24MAR2023 151705 4.0S 143.0E 4.0-5.4 AABAA Papua New Guinea

P: 28MAR2023 151701 4.0S 145.0E 4.0-5.4 BAAAA New Ireland

An M 5.6 was also felt in the northern Philippine Islands today. NEIC reported it was felt with intensity V in Namuac, Cagayan Valley and III in Piddig Ilocos and Liwan Cordillera. PHIVOLCS reported it was felt with intensity V in Calayan, Cagayan; IV in Bangui, Burgos and Pagudpud, Ilocos Norte; Claveria and Santa Praxedes, Cagayan and III in Luna , Apayao; Adams, Bacarra, Dumalneg, Pasuquin and San Nicolas, Ilocos Norte; Abulug, Aparri, Pamplona, Penablanca and Sanches-Mira, Cagayan. An M 6.0 occurred near this epicenter on June 30, 2022 and this may be the strongest aftershock to date of that event. Forecast 151759 had expected today's event was likely northwest of this epicenter around March 22.

O: 22MAR2023 23:31:57 19.3N 121.1E Mw=5.6 EMSC BABUYAN ISL REGION, PHILIPPINE

P: 22MAR2023 151759 21.0N 120.0E 4.0-5.4 ABAAA Taiwan

An M 5.6 also occurred in northern Honshu, Japan today. NEIC reported it was felt with light intensity in Iwate and Aomori, Japan. This is the strongest earthquake within about 150 km of this epicenter since an M 5.7 on October 5, 2021. The last event of significantly larger magnitude in this region was an M 6.3 on December 20, 2020. Strong triggering by tides or SFE can indicate a buildup of seismic stress and the possibility of a larger upcoming regional event. Forecasts 151551 and 151833 had expected this event was likely around March 17-26 within about 50 km of today's epicenter.

O: 22MAR2023 08:23:45 40.3N 143.0E mb=4.3 EMSC OFF EAST COAST OF HONSHU, JAPAN

O: 22MAR2023 07:36:59 40.3N 143.1E Mw=5.6 EMSC OFF EAST COAST OF HONSHU, JAPA

P: 17MAR2023 151551 40.0N 143.0E 3.5-5.6 BAAAA Hokkaido, Japan

P: 26MAR2023 151833 40.0N 142.0E 3.5-5.4 BAAAA Hokkaido, Japan

An M 5.5 aftershock also occurred in northern Kermadec Islands today. It was reported felt lightly at Meremere, Waikato, North Island, New Zealand.

This is the strongest aftershock to date of the M 7.0 in the Kermadec Islands of March 16, 2023. It occurred about 150 km northwest of that mainshock and was likely promoted by regional stress redistribution. Forecast 151949 and 151953 had expected today's event within about 100 km was likely around March 22-23.

O: 22MAR2023 14:16:46 30.3S 177.2W mb=5.5 EMSC KERMADEC ISLANDS, NEW ZEALAND

P: 22MAR2023 151949 30.0S 176.0W 4.0-5.4 AAAAA No. Kermadec Islands

P: 23MAR2023 151953 31.0S 178.0W 4.0-5.6 AAAAA So. Kermadec Islands

An unusually large M 4.2-4.4 hit the border of France and Switzerland today. NEIC reported it was felt with maximum intensity V in Arlesheim, Basel-Landschaft and IV in Zuchwil, Solthurn, Switzerland and II in Chezard-Saint-Martin, Nuenbergy and in France with II-III in Allenjoie, Delle Franche-Compte, Mertzen, Ronchamp, Bettlach, Alsace, Brunstatt, Habshein. This earthquake occurred near local solar noon and may have been promoted by strong tidal and/or geomagnetic effects. The last earthquake within about 200 km of today's epicenter with M>=4.2 was an M 4.3 on September 10, 2022 but the last of M>=4.4 was an M 4.4 on October 24, 2015. The last earthquake significantly larger magnitude in this areas was an M 5.5 on February 23, 2004. Forecast 151827 had expected today's event south of this epicenter in this area was likely around March 26, 2023. This epicenter is located at 142-144 degrees from the M 7.0 in Vanuatu of January 8 and may have been promoted by energy from that source.

O: 22MAR2023 14:50:34 47.4N 6.9E ML=4.4 EMSC SWITZERLAND

P: 26MAR2023 151827 45.0N 7.0E 3.0-5.3 BCAAA Austria

The largest earthquakes in the U.S. or Canada today occurred in the area of Sitka, Southeastern Alaska with M 4.2 and 4.3. NEIC reported this earthquake of M 3.7 in Southeastern Alaska was felt with intensity II-III in the area(s) of Southeastern Alaska in Elfin Cove, Gustavus and Douglas. The first of these of M 4.3 occurred near local solar midnight and may have been promoted by high tidal stresses and SFE from the new moon and geomagnetic storm which maximize near this hour. Forecast 151887 had expected this activity was likely within about 100 km around March 22, 2023.

O: 22MAR2023 14:34:04 58.1N 137.5W ml=3.7 EMSC SOUTHEASTERN ALASKA

O: 22MAR2023 09:59:13 58.2N 137.5W MB=4.3 ECAN of Sitka, Alaska, USA

O: 22MAR2023 14:34:04 58.2N 137.5W MB=4.2 ECAN of Sitka, Alaska, USA

O: 22MAR2023 09:59:13 58.2N 137.5W mb=4.0 EMSC SOUTHEASTERN ALASKA

P: 22MAR2023 151887 57.0N 138.0W 3.0-4.4 ABAAA Southeast Alaska

An unusual earthquake of M 3.6 was lightly felt in the Maliotenam area of Quebec, Canada today according to Earthquakes Canada (ECAN). This is the strongest earthquake within about 150 km of this epicenter since an M 4.1 on January 16, 2015 and an M 4.4 on September 21, 2013. The largest earthquake in this area in the past 35 years was an M 5.1 on March 16, 1999. Forecast 151549 and 151559 had expected this event within about 100 km was likely in mid-March.

O: 22MAR2023 14:06:49 50.1N 66.1W MB=3.6 ECAN of Maliotenam, QC, felt

O: 22MAR2023 14:06:49 50.1N 66.1W ML=3.6 EMSC EASTERN QUEBEC, CANADA

P: 11MAR2023 151549 49.0N 66.0W 2.0-4.4 CBAAA E. of Maine

P: 11MAR2023 151559 49.3N 67.5W 2.0-4.4 CAAAA Maine

As noted above an M 2.3 earthquake in the San Francisco region of California today coincided with the strongest GRB in the past three weeks (see above). As this earthquake occurred near local solar noon it may have been promoted by effects associated with the GRB. If this is the case, the area is very close to a stress breaking point. Forecast 151770 had expected this earthquake was likely within about 10 km around March 25.

O: 22MAR2023 21:10:10 37.3N 121.7W Md=2.3 EMSC NORTHERN CALIFORNIA

P: 25MAR2023 151770 37.3N 121.6W 2.5-4.6 BAAAA Central California

An unusually large earthquake of M 4.8-4.9 also occurred shortly after the GRB in Albania. This is the largest earthquake in Albania since an M 5.5 on January 9, 2022. Forecasts 151789 and 151858 had expected today's activity Albania was likely within about 100 km around March 24-25.

NEIC reported this earthquake of M 4.4 and M 4.9 in Albania was felt with intensity II-III in the area(s) of Albania in Erseke, Kolonje. This epicenter is located at 142-144 degrees from the M 7.0 in Vanuatu of January 8 and may have been promoted by energy from that source.

O: 23MAR2023 02:09:34 40.4N 20.8E ML=3.7 EMSC ALBANIA

O: 23MAR2023 03:30:40 40.4N 20.7E mb=4.4 EMSC ALBANIA

O: 23MAR2023 01:43:20 40.5N 20.7E mb=4.8 EMSC ALBANIA

P: 24MAR2023 151789 39.0N 21.0E 3.0-4.6 ABAAA No. Greece

P: 25MAR2023 151858 40.0N 23.0E 3.0-5.3 AABAA Romania/NW Turkey

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 22MAR2023 15:43:06 23.7N 121.3E ML=4.6 EMSC TAIWAN

O: 22MAR2023 15:43:05 23.7N 121.3E ML=4.6 TAI Hualien, Taiwan

O: 22MAR2023 21:51:05 23.7N 121.3E mb=4.2 EMSC TAIWAN

O: 22MAR2023 21:51:04 23.7N 121.3E ML=4.6 TAI Hualien, Taiwan

P: 24MAR2023 151760 23.0N 122.0E 4.0-5.4 AAAAA Taiwan

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

CWB reported the first earthquake of M 4.6 was felt with intensity III in Hualien, II in Nantou, Yunlin, and I in Yilan, Taichung, Changhua, Taitung, Chiayi, and Tainan Counties, Taiwan.

CWB reported the second earthquake of M 4.6 was felt with intensity III in Hualien, II in Nantou, Yunlin, and I in Yilan, Taichung, Changhua, Taitung, Chiayi, and Tainan Counties, Taiwan.

O: 22MAR2023 10:38:47 37.2N 54.7E mb=5.1 EMSC NORTHERN IRAN

P: 23MAR2023 151791 37.0N 51.0E 3.8-5.4 AACAA No. Iran

NEIC reported this earthquake of M 5.1 in Iran was felt with intensity II-III in the area(s) of Iran IV-V in Aliabad, Bonbad-e Kavus, Astarabad, Golestan, Bandar-e Shah, Kordkouy Ashraf Mazandaran; IV in Kalaleh, Ememshahr, Sari, Mazandaran and III in Aliabad and Gonbad-e Kavus, Golestan.

O: 23MAR2023 02:53:50 39.4N 69.7E mb=4.5 EMSC TAJIKISTAN

O: 23MAR2023 01:52:57 39.2N 69.8E ML=4.2 EMSC TAJIKISTAN

O: 22MAR2023 20:07:45 39.5N 70.0E mb=5.8 EMSC TAJIKISTAN

P: 26MAR2023 151780 39.0N 71.0E 3.8-5.6 BAAAA Hindu Kush/Pakistan

O: 22MAR2023 12:37:57 51.8N 159.3E mb=4.4 EMSC OFF EAST COAST OF KAMCHATKA

P: 21MAR2023 151880 51.0N 158.0E 4.0-5.7 AAAAA Kamchatka

NEIC reported this earthquake of M 4.3 in Kamchatka, Russia was felt with intensity II-III in the area(s) of Kamchatka, Russia in Petropavlovsk.

INDONESIA AND PHILIPPINES

O: 22MAR2023 18:41:38 2.6S 136.4E ML=4.0 EMSC NEAR N COAST OF PAPUA, INDONES

P: 21MAR2023 151711 1.0S 137.0E 4.0-5.6 ABAAA West Irian, PNG

O: 23MAR2023 00:17:39 4.4S 144.2E Mw=5.7 EMSC NEAR N COAST OF NEW GUINEA, PN

P: 24MAR2023 151705 4.0S 143.0E 4.0-5.4 AABAA Papua New Guinea

P: 28MAR2023 151701 4.0S 145.0E 4.0-5.4 BAAAA New Ireland

O: 22MAR2023 08:55:46 5.3N 126.3E ML=4.4 EMSC MINDANAO, PHILIPPINES

P: 23MAR2023 151686 5.0N 126.0E 4.0-5.6 AAAAA Mindanao, Philippines

O: 22MAR2023 20:23:45 8.9S 123.2E mb=5.1 EMSC FLORES REGION, INDONESIA

P: 24MAR2023 151696 8.0S 124.0E 4.0-5.4 AAAAA Flores Island area

NEIC reported this earthquake of M 5.1 in Flores Islands, Indonesia was felt with intensity II-III in the area(s) of Flores Islands, Indonesia in Maumere and Kupang, Timur.

O: 22MAR2023 23:31:57 19.3N 121.1E Mw=5.6 EMSC BABUYAN ISL REGION, PHILIPPINE

P: 22MAR2023 151759 21.0N 120.0E 4.0-5.4 ABAAA Taiwan

CENTRAL AND SOUTH AMERICA

O: 22MAR2023 13:45:19 11.1S 71.6W mb=4.5 EMSC CENTRAL PERU

P: 22MAR2023 151912 14.0S 71.0W 4.0-5.8 CAAAA Central Peru

O: 22MAR2023 13:36:08 29.7S 72.4W mb=4.2 EMSC OFFSHORE COQUIMBO, CHILE

P: 25MAR2023 151931 29.0S 72.0W 4.0-5.6 BAAAA Coast Central Chile

O: 22MAR2023 07:09:30 9.3N 84.2W ML=4.2 EMSC COSTA RICA

P: 20MAR2023 151433 10.0N 84.0W 3.5-5.6 AAAAA Caribbean Sea

O: 23MAR2023 01:44:42 10.5N 86.1W mb=4.4 EMSC OFF COAST OF COSTA RICA

O: 22MAR2023 20:30:30 10.3N 86.3W ML=4.4 EMSC OFF COAST OF COSTA RICA

P: 20MAR2023 151449 11.0N 86.0W 3.5-5.3 AAAAA Nicaragua

O: 22MAR2023 11:57:15 13.1N 89.3W ML=4.0 EMSC OFFSHORE EL SALVADOR

P: 24MAR2023 151722 13.0N 90.0W 3.5-5.1 AAAAA Guatemala

O: 22MAR2023 17:18:46 15.8N 95.1W ML=4.1 EMSC OFFSHORE OAXACA, MEXICO

O: 23MAR2023 02:43:07 15.2N 94.7W ML=4.1 EMSC OFF COAST OF OAXACA, MEXICO

P: 22MAR2023 151718 15.0N 95.0W 3.5-5.3 AAAAA Chiapas, Mexico

O: 23MAR2023 06:08:23 16.3S 75.1W mb=4.2 EMSC OFF COAST OF SOUTHERN PERU

P: 24MAR2023 151912 15.0S 76.0W 4.0-5.5 ABAAA Central Peru

O: 22MAR2023 15:27:04 16.7N 99.2W ML=4.6 EMSC GUERRERO, MEXICO

P: 23MAR2023 151736 17.0N 99.0W 3.5-5.6 AAAAA Oaxaca, Mexico

O: 22MAR2023 13:33:40 17.0N 94.0W ML=4.1 EMSC OAXACA, MEXICO

P: 29MAR2023 151719 17.0N 95.0W 3.5-5.3 CAAAA Chiapas, Mexico

O: 22MAR2023 08:05:29 19.5N 70.5W ML=3.0 EMSC DOMINICAN REPUBLIC

P: 23MAR2023 151739 19.0N 71.0W 3.4-5.5 AAAAA Puerto Rico

O: 22MAR2023 15:38:36 22.7S 68.9W mb=4.4 EMSC ANTOFAGASTA, CHILE

P: 27MAR2023 151932 22.0S 69.0W 4.0-6.0 BAAAA Coast No. Chile

O: 22MAR2023 15:18:49 23.6S 66.5W Mw=5.3 EMSC JUJUY, ARGENTINA

O: 22MAR2023 16:00:33 23.6S 66.6W Mw=6.4 EMSC JUJUY, ARGENTINA

P: 22MAR2023 151930 24.0S 66.0W 4.0-5.9 AAAAA Argentina

O: 22MAR2023 13:36:08 29.7S 72.4W mb=4.2 EMSC OFFSHORE COQUIMBO, CHILE

P: 25MAR2023 151931 29.0S 72.0W 4.0-5.6 BAAAA Coast Central Chile

O: 23MAR2023 05:43:54 34.1S 70.2W mb=4.1 EMSC LIBERTADOR O'HIGGINS, CHILE

P: 23MAR2023 151946 33.0S 72.0W 4.0-5.8 ABBAA Central Chile

AFRICA AND EUROPE

O: 23MAR2023 05:45:21 37.9N 36.6E mb=4.4 EMSC CENTRAL TURKEY

P: 23MAR2023 151820 38.0N 36.0E 3.5-5.1 AAAAA Turkey

O: 22MAR2023 19:43:25 38.2N 38.1E mb=4.1 EMSC EASTERN TURKEY

P: 27MAR2023 151820 38.0N 38.0E 3.5-5.0 BAAAA Turkey

O: 22MAR2023 07:44:01 37.9N 21.1E ML=3.9 EMSC SOUTHERN GREECE

P: 23MAR2023 151789 37.0N 21.0E 3.0-4.7 AAAAA No. Greece

O: 23MAR2023 02:09:34 40.4N 20.8E ML=3.7 EMSC ALBANIA

O: 23MAR2023 03:30:40 40.4N 20.7E mb=4.4 EMSC ALBANIA

O: 23MAR2023 01:43:20 40.5N 20.7E mb=4.8 EMSC ALBANIA

P: 24MAR2023 151789 39.0N 21.0E 3.0-4.6 ABAAA No. Greece

P: 25MAR2023 151858 40.0N 23.0E 3.0-5.3 AABAA Romania/NW Turkey

O: 22MAR2023 14:50:34 47.4N 6.9E ML=4.4 EMSC SWITZERLAND

P: 26MAR2023 151827 45.0N 7.0E 3.0-5.3 BCAAA Austria

SOUTHWEST PACIFIC

O: 23MAR2023 05:52:22 10.7S 164.6E Mw=5.2 EMSC SANTA CRUZ ISLANDS REGION

P: 23MAR2023 151926 11.0S 164.0E 4.0-5.4 AAAAA Vanuatu Islands

OCEAN RIDGES

O: 23MAR2023 03:37:56 42.6S 82.6W mb=4.7 EMSC WEST CHILE RISE

O: 23MAR2023 02:56:56 42.8S 82.4W Mw=5.1 EMSC WEST CHILE RISE

P: 12MAR2023 151663 43.0S 83.0W 4.0-5.4 CAAAA Chile Rise

ZEALANDIA AND AUSTRALIA REGION

O: 22MAR2023 14:16:46 30.3S 177.2W mb=5.5 EMSC KERMADEC ISLANDS, NEW ZEALAND

P: 22MAR2023 151949 30.0S 176.0W 4.0-5.4 AAAAA No. Kermadec Islands

P: 23MAR2023 151953 31.0S 178.0W 4.0-5.6 AAAAA So. Kermadec Islands

O: 22MAR2023 23:23:09 32.8S 139.6E mb=4.9 EMSC NEAR COAST OF SOUTH AUSTRALIA

JAPAN AND KURIL ISLANDS

O: 22MAR2023 19:32:30 37.0N 141.3E ML=3.9 EMSC NEAR EAST COAST OF HONSHU, JAP

P: 23MAR2023 151790 37.0N 139.0E 3.5-4.9 AABAA No. Honshu, Japan

O: 22MAR2023 08:23:45 40.3N 143.0E mb=4.3 EMSC OFF EAST COAST OF HONSHU, JAPAN

O: 22MAR2023 07:36:59 40.3N 143.1E Mw=5.6 EMSC OFF EAST COAST OF HONSHU, JAPA

P: 17MAR2023 151551 40.0N 143.0E 3.5-5.6 BAAAA Hokkaido, Japan

P: 26MAR2023 151833 40.0N 142.0E 3.5-5.4 BAAAA Hokkaido, Japan

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 22MAR2023 13:50:43 33.0N 115.5W Ml=2.3 EMSC SOUTHERN CALIFORNIA

P: 20MAR2023 151521 32.8N 116.0W 2.5-4.6 AAAAA So. California

O: 22MAR2023 19:44:50 32.8N 115.5W Ml=2.2 EMSC SOUTHERN CALIFORNIA

O: 22MAR2023 11:15:57 32.8N 115.4W Ml=2.0 EMSC SOUTHERN CALIFORNIA

P: 21MAR2023 151803 32.4N 115.8W 2.5-4.8 AAAAA So. California

O: 22MAR2023 15:25:24 35.7N 117.6W Ml=2.1 EMSC SOUTHERN CALIFORNIA

O: 22MAR2023 23:09:36 35.5N 117.4W Ml=2.0 EMSC SOUTHERN CALIFORNIA

P: 20MAR2023 151526 35.0N 117.7W 2.5-4.9 AAAAA So. California

O: 23MAR2023 04:53:38 35.5N 118.4W Ml=2.0 EMSC CENTRAL CALIFORNIA

P: 22MAR2023 151811 35.6N 118.4W 2.5-4.7 AAAAA So. California

O: 22MAR2023 21:10:10 37.3N 121.7W Md=2.3 EMSC NORTHERN CALIFORNIA

P: 25MAR2023 151770 37.3N 121.6W 2.5-4.6 BAAAA Central California

O: 23MAR2023 03:38:53 36.7N 121.3W Md=3.4 ANSS CENTRAL CALIFORNIA

P: 21MAR2023 151769 36.7N 121.4W 2.5-4.6 AAAAA Central 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 Gonzales, Hollister, Salinas, San Juan Bautista, Marina, Carmel Valley, Monterey, Carmel.

O: 23MAR2023 00:23:15 38.1N 122.0W Md=2.5 EMSC SAN FRANCISCO BAY AREA, CALIF.

P: 24MAR2023 151770 38.0N 122.3W 2.5-4.6 AAAAA Central California

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

O: 22MAR2023 18:12:19 38.8N 122.8W Md=2.1 EMSC NORTHERN CALIFORNIA

P: 24MAR2023 151771 38.8N 122.8W 2.5-4.6 AAAAA Central California

O: 22MAR2023 07:45:09 39.4N 122.9W Md=2.3 EMSC NORTHERN CALIFORNIA

P: 19MAR2023 151568 40.0N 123.0W 2.5-4.7 BAAAA Northern California

ALASKA

O: 22MAR2023 14:34:04 58.1N 137.5W ml=3.7 EMSC SOUTHEASTERN ALASKA

O: 22MAR2023 09:59:13 58.2N 137.5W MB=4.3 ECAN of Sitka, Alaska, USA

O: 22MAR2023 14:34:04 58.2N 137.5W MB=4.2 ECAN of Sitka, Alaska, USA

O: 22MAR2023 09:59:13 58.2N 137.5W mb=4.0 EMSC SOUTHEASTERN ALASKA

P: 22MAR2023 151887 57.0N 138.0W 3.0-4.4 ABAAA Southeast Alaska

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

O: 23MAR2023 01:45:25 47.8N 120.9W Ml=2.2 EMSC WASHINGTON

O: 22MAR2023 22:08:00 47.8N 120.9W ML=2.8 EMSC WASHINGTON

P: 16MAR2023 151584 47.7N 120.3W 2.0-3.9 CAAAA Washington state, U.S.

NEIC reported this earthquake of M 2.6 in Washington State was felt with intensity II-III in the area(s) of Washington State in Leavenworth, Cashmere, Wenatchee, Black Diamond and Seattle.

O: 22MAR2023 17:42:28 53.3N 133.0W ML=3.2 EMSC QUEEN CHARLOTTE ISLANDS REGION

O: 22MAR2023 17:42:28 53.3N 133.0W MB=3.2 ECAN of Village of Queen Charlotte, BC

P: 22MAR2023 151875 54.0N 134.0W 3.0-5.4 AAAAA British Colombia

ROCKY MOUNTAINS REGION

O: 22MAR2023 13:40:22 28.6N 98.3W ML=2.2 EMSC SOUTHERN TEXAS

P: 27MAR2023 151754 28.0N 98.0W 3.0-4.7 BAAAA Northern Mexico

O: 22MAR2023 17:18:49 35.7N 104.8W ML=2.5 EMSC NEW MEXICO

P: 21MAR2023 151801 35.4N 101.8W 2.0-4.4 AACAA SW U.S.A

P: 29MAR2023 151775 37.1N 104.7W 2.0-4.2 CBAAA Colorado area

NEIC reported this earthquake of M 2.5 in New Mexico was felt with intensity II-III in the area(s) of New Mexico in Santa Fe and Tucumcari.

O: 23MAR2023 06:57:06 44.5N 107.7W ML=2.8 EMSC WYOMING

P: 28MAR2023 151830 41.9N 108.7W 2.0-3.9 BCAAA Colorado area

EASTERN U.S./CANADA

O: 22MAR2023 13:40:22 28.6N 98.3W ML=2.2 EMSC SOUTHERN TEXAS

P: 27MAR2023 151754 28.0N 98.0W 3.0-4.7 BAAAA Northern Mexico

O: 22MAR2023 14:06:49 50.1N 66.1W MB=3.6 ECAN of Maliotenam, QC, felt

P: 11MAR2023 151549 49.0N 66.0W 2.0-4.4 CBAAA E. of Maine

P: 11MAR2023 151559 49.3N 67.5W 2.0-4.4 CAAAA Maine

O: 21MAR2023 20:49:25 48.2N 69.4W MB=1.9 ECAN of Trois-Pistoles, QC

O: 21MAR2023 23:10:54 47.7N 70.1W MB=0.7 ECAN of La Malbaie, QC

P: 19MAR2023 151564 47.3N 70.5W 2.0-4.4 AAAAA New England

HAWAII

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

NEW MOON BRINGS STRONG SEISMIC ENHANCEMENT

EARTHQUAKE SUMMARY FOR MARCH 21, 2023

The new moon today was closely associated with a strong M 6.5 in Afghanistan and an M 5.6 in Central Chile near Valparaiso. These events occurred within about an hour of the new moon and were probably triggered by strong associated tidal stresses. Seismicity seems strongly triggered by this new moon and moderately large to large earthquakes, especially near these events in Chile and Central Asia should be expected in the next two days.

An M 6.5 earthquake shook Afghanistan and Pakistan today. NEIC reported

the quake was felt with maximum intensity VII in Dir, North-West Frontier, Pakistan with V in Bat Khela, Qurgoonteppa, Tordher, IV in Khorug, Tall, Tordher; in Afghanistan at Qundoz, Falzabad, Badahsan and in Tajikistan at Qurgonteppa, Obigarm, Karotegin. More than 200 people were hospitalized - mostly from shock - but at least 9 were also killed in this intermediate focus earthquake. Because the focus was at an intermediate depth (165 km) damage

on the surface was minimal and included many homes and buildings in Pakistan and Afghanistan downed by the intensity of the shaking. Some were crushed by falling debris. In Islamabad, buildings cracked resulting in mass evacuations. Power was out in many areas and highways were blocked by landslides. This earthquake occurred near local solar midnight and within about an hour of the new moon at a longitude near that of maximum tidal stress with this new moon as previously published in this summary:

The mainshock was preceded by an M 4.0 foreshock within minutes of local solar noon which was probably promoted by strong tidal stresses with the new moon as well. The last earthquake of equal or greater magnitude within about 250 km of this epicenter occurred on April 10, 2016 - an aftershock of the M 7.5 of October 26, 2015. At the time of the M 6.6 in April, 2016 this summary noted in this regard:

"A series of earthquakes today hit at 103 degrees from the earthquakes of M 6.6-7.0 which occurred on April 3, 6 and 7, 2016. The largest of these events was an M 6.6 in Hindu Kush, Afghanistan but others occurred in Mexico with M 5.6 and in Oklahoma. An unusual earthquake in western Nebraska of M 3.2 today was also located at 102 degrees from Vanuatu. Seismic energy from large earthquakes directed into the earth arrives at the core-mantle boundary which reflects and refracts this energy. The reflected and refracted returns to the surface within a degree or two of 103 degrees from the mainshock epicenter (depending on the depth of the mainshock and the far field location). This is the edge of the seismic shadow zone between about 103 and 144 degrees where little seismic energy returns to the surface. The concentration of this energy near 103 degrees can help trigger seismicity in seismic zones at 103 and 144 degrees from the mainshock. This summary has adhered to this position since its inception and has noted hundreds of examples of this type of seismic triggering." (April 10, 2016)

The mention of the earthquake in Nebraska at 103 degrees from this event reminds that an unusual earthquake in Nebraska (at 103 degrees from today's epicenter also occurred on March 17 with M 2.9 and was noted in this summary as:

"An M 2.9 in Nebraska today could be a precursor to a stronger earthquake along the western boundary of the North American Plate." (March 17, 2023)

and

"Today's event in Nebraska is located at 101-102 degrees from the M 7.0 in the Kermadec Islands of March 16, 2023 and may have been promoted by energy from that source" (March 17, 2023)

Forecasts 151495 and 151779 had expected enhanced seismicity within about

100 km was likely around March 18 and 25. This event is located at 141 degrees from the M 6.8 of January 20 in Argentina and at the third node (120 degrees) from the recent major earthquakes in Tonga and Fiji and the Kermadec Islands and at 103 degrees from the M 7.0 in Vanuatu of January 8, 2023 and the M 6.4 off northern California of December 20, 2022 and may have been promoted by energy from that source.

O: 21MAR2023 16:47:24 36.5N 71.0E Mw=6.5 EMSC HINDU KUSH REGION, AFGHANISTAN

O: 21MAR2023 07:25:46 36.9N 71.0E mb=4.0 EMSC HINDU KUSH REGION, AFGHANISTAN

P: 18MAR2023 151495 37.0N 72.0E 3.8-5.2 BAAAA Hindu Kush/Pakistan

P: 23MAR2023 151779 36.0N 69.0E 3.8-5.3 AABAA Hindu Kush/Pakistan

P: 25MAR2023 151779 37.0N 70.0E 3.8-5.4 BAAAA Hindu Kush/Pakistan

Less than an hour after the earthquake in Pakistan/Afghanistan an M 5.6 shook the region of Valparaiso, Chile. NEIC reported it was felt in Valparaiso at San Antonio, Quilpue, Limache, and V in Villa Alemana and in Metropolitana at Santiago, San Bernardo, Lampa, Penaflor, Melipilla with lesser shaking in Valparaiso. This earthquake occurred within minutes of local solar noon and within minutes of the new moon. Seismic enhancement at this time and longitude had been expected with this new moon in previous issues of this summary (see above).

An M 5.5 earthquake hit west of this epicenter on December 10, 2022 but the last event in Valparaiso, Chile of greater magnitude was an M 5.7 on November 3, 2021 but the last event of significantly larger size within about 200 km of today's event occurred on August 1, 2019 about 150 km southwest of today's epicenter on August 1, 2019. At the time of the January 24, 2021 event this summary noted in this regard:

"An earthquake of M 5.8 was also felt widely in the Santiago area of Central Chile today. NEIC reported maximum intensity V in Graneros, O'Higgins with IV ikn the Santiago, Chile area at Puente Alto, Lampa, Paine, Penaflor, Talagante and III in San Bernardo, Buin and San Felipe, Valparaiso. A foreshock to the east in Mendoza, Argentina of M 4.2 was felt with intensity III in Mendoza and Corrientes, Argentina. Large earthquakes in this area of Chile occur almost exclusively to the west of this epicenter by about 150+ km. The last earthquake within about 150 km of this epicenter with M>=5.8 as an M 6.4 on June 16, 2000." (January 24, 2021)

Forecast 151946 had expected today's earthquake in Valparaiso, Chile was likely within about 100 km around March 23, 2023. This event is located at 144 degrees from the M 7.2 in the Molucca area of January 18 and at the fourth node (90 degrees) from the M 6.4 off Northern California of December 20, 2022 and may have been promoted by energy from that source.

O: 21MAR2023 17:38:13 33.6S 71.3W Mw=5.6 EMSC VALPARAISO, CHILE

P: 23MAR2023 151946 33.0S 72.0W 4.0-5.8 AAAAA Central Chile

An unusual earthquake of M 4.9-5.0 also occurred today in northeastern Siberia,

Russia. It was not reported felt. The only events within about 300 km of this epicenter in the past 35 years was an M 5.0 on March 19, 2023 and an M 4.8 on October 9, 2021. This is a co-mainshock with that event. Neither of these earthquakes were reported felt. Forecast 151902 had expected today's event within about 150 km was likely around March 21.

O: 21MAR2023 17:23:33 63.3N 158.5E mb=4.9 EMSC MAGADANSKAYA OBLAST', RUSSIA

P: 21MAR2023 151902 62.0N 158.0E 3.5-4.9 AAAAA North of Kamchatka

The strongest earthquake in the U.S. or Canada today was an M 4.5 aftershock of the M 6.4 quake of December 20, 2022 off the coast of northern California.

NEIC reported this earthquake was felt with intensity IV in northern California in Ferndale, Loleta, Fortuna, Rio Dell, III in Hydesville, Eureka, Petrolia, Scotia, Samoa, Eureka and as far as San Jose, California and Olympia, Washington. The only aftershock of larger magnitude since the mainshock of December 20 was an M 5.4 on January 1, 2023. This event was discussed in this summary at the time as:

"An M 5.4 aftershock of the M 6.4 in Northern California of December 20, 2022 was widely felt with additional damage today. NEIC reported maximum intensity VII in Rio Dell with VI in Scotia, Carlotta, Redcrest, Hydesville, V in Petrolia, Ferndale and Fortuna and IV in Myers Flat and Kneeland. It was reported felt as far as Nevada, Southern California, Washington and Oregon and British Columbia with intensity up to IV. The quake occurred near local solar noon and may have been promoted by SFE and/or tidal stresses which maximize near this hour." (January 1, 2023)

Forecast 151852 had expected today's event within about 25 km was likely around

March 22, 2023. This event is located at 102 degrees from the M 6.5 in Afghanistan today and the recent major earthquakes in Turkey and Tajikistan and may have been promoted by energy from that source.

O: 21MAR2023 23:18:20 40.6N 124.4W Mw=4.5 EMSC OFFSHORE NORTHERN CALIFORNIA

P: 22MAR2023 151852 40.7N 124.6W 2.5-4.6 AAAAA Off Coast of No. Calif

An unusual earthquake of M 4.4 also occurred today in western Greenland. This event near local solar midnight may have been promoted by strong tidal stresses with today's new moon as it occurred near the longitude of maximum stress with that alignment. This is an unusually large earthquake for this region. Two earthquakes of M>=4.6 have occurred within about 400 km of this epicenter in the past 35 years - an M 4.9 on January 22, 2001 and an M 4.7 near this epicenter on April 6, 2016. At the time this summary noted:

"The strongest earthquake in North America today occurred as an M 4.7 in the area of Western Greenland near Aasiaat. This earthquake was not reported felt in this remote area, part of the Baffin and Davis Straits seismic zone. The is the strongest earthquake within about 250 km of this epicenter in this zone in at least the past 25 years." (April 6, 2016)

Forecast 151613 had expected today's event within about 25 km was likely around March 17 while forecast 151892 had expected it about 200 km to the south around March 21, 2023. This activity is at the third node (120 degrees) from recent large earthquakes in Tonga/Fiji and the Vanuatu Islands and may have been promoted by energy from those sources.

O: 21MAR2023 06:56:56 68.9N 53.4W MB=4.7 ECAN of Qeqertasuaq, GL

P: 17MAR2023 151613 69.0N 53.0W 2.5-4.0 BAAAA Baffin/Davis Strait Canada

P: 21MAR2023 151892 67.0N 54.0W 2.5-4.2 ABAAA Baffin/Davis Strait Canada

A series of moderate earthquakes in the Atlantic Basin joined the event in Greenland today. The strongest of these was an M 5.3 in the South Sandwich Islands which was not reported felt in this area. It had been anticipated in forecasts 151964 and 151965 within about 150 km of this epicenter to occur around March 21-25. This event occurred near local solar midnight and may have been promoted by strong tidal stresses with today's new moon.

O: 22MAR2023 02:25:30 59.7S 26.2W mb=5.3 EMSC SOUTH SANDWICH ISLANDS REGION

P: 21MAR2023 151964 58.0S 25.0W 4.0-5.9 ABAAA So. Sandwich Islands

P: 25MAR2023 151965 61.0S 26.0W 4.0-5.8 BBAAA Southern Ocean

The other moderate earthquakes in the Atlantic today occurred in the Northern Mid-Atlantic with M 4.9, 5.0, 5.0. These were not felt in this remote area. The last earthquake of M>=5 within about 200 km of these epicenters was recorded on January 10, 2022 with M 6.0. Today's events may be aftershocks, the strongest to date of the January, 2022 event. Forecast 151468 had expected today's activity within about 50 km was likely around March 18. This activity is located at 141 degrees from the M 6.9 and 7.0 in the Kermadec Islands of March 4 and March 16 and may have been promoted by energy from those sources.

O: 21MAR2023 20:46:54 28.4N 43.6W mb=5.0 EMSC NORTHERN MID-ATLANTIC RIDGE

O: 21MAR2023 20:41:08 28.6N 43.6W mb=4.9 EMSC NORTHERN MID-ATLANTIC RIDGE

O: 21MAR2023 20:49:21 28.6N 43.7W mb=5.0 EMSC NORTHERN MID-ATLANTIC RIDGE

P: 18MAR2023 151468 29.0N 44.0W 4.0-5.8 BAAAA Mid-Atlantic Ridge

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 21MAR2023 21:27:29 29.7N 104.7E mb=4.2 EMSC EASTERN SICHUAN, CHINA

P: 23MAR2023 151753 26.0N 101.0E 4.0-5.6 ACCAA Myanmar

O: 21MAR2023 16:47:24 36.5N 71.0E Mw=6.5 EMSC HINDU KUSH REGION, AFGHANISTAN

O: 21MAR2023 07:25:46 36.9N 71.0E mb=4.0 EMSC HINDU KUSH REGION, AFGHANISTAN

P: 18MAR2023 151495 37.0N 72.0E 3.8-5.2 BAAAA Hindu Kush/Pakistan

P: 23MAR2023 151779 36.0N 69.0E 3.8-5.3 AABAA Hindu Kush/Pakistan

P: 25MAR2023 151779 37.0N 70.0E 3.8-5.4 BAAAA Hindu Kush/Pakistan

O: 21MAR2023 17:23:33 63.3N 158.5E mb=4.9 EMSC MAGADANSKAYA OBLAST', RUSSIA

P: 21MAR2023 151902 62.0N 158.0E 3.5-4.9 AAAAA North of Kamchatka

INDONESIA AND PHILIPPINES

O: 21MAR2023 14:40:30 2.4N 128.8E mb=4.9 EMSC HALMAHERA, INDONESIA

P: 27MAR2023 151682 2.0N 129.0E 4.0-5.4 CAAAA Halmahera

O: 21MAR2023 19:32:42 2.5S 140.7E mb=4.5 EMSC NEAR N COAST OF PAPUA, INDONES

P: 27MAR2023 151705 3.0S 143.0E 4.0-5.4 CABAA Papua New Guinea

NEIC reported this earthquake of M 4.5 in Papua, Indonesia was felt with intensity IV in the area(s) of Papua, Indonesia in Jaya Pura.

O: 22MAR2023 02:15:29 3.6S 131.2E mb=4.5 EMSC CERAM SEA, INDONESIA

P: 25MAR2023 151713 5.0S 130.0E 4.0-5.4 BBBAA West Irian, PNG

O: 21MAR2023 13:46:19 4.1N 128.7E ML=4.5 EMSC NORTH OF HALMAHERA, INDONESIA

O: 21MAR2023 11:21:14 4.3N 127.8E ML=4.0 EMSC KEPULAUAN TALAUD, INDONESIA

P: 23MAR2023 151686 5.0N 126.0E 4.0-5.6 AABAA Mindanao, Philippines

O: 21MAR2023 20:37:55 6.5S 130.2E mb=4.4 EMSC BANDA SEA

P: 25MAR2023 151713 5.0S 130.0E 4.0-5.4 BBAAA West Irian, PNG

O: 22MAR2023 04:28:14 6.8N 126.2E mb=4.8 EMSC MINDANAO, PHILIPPINES

P: 22MAR2023 151677 7.0N 126.0E 4.0-5.5 AAAAA Central Philippines

NEIC reported this earthquake of M 4.8 in Mindanao, Philippines was felt with intensity II-III in the area(s) of Mindanao, Philippines in Mati and Davao.

O: 21MAR2023 09:00:48 7.7S 127.5E mb=4.4 EMSC KEPULAUAN BARAT DAYA, INDONESI

P: 22MAR2023 151690 6.0S 128.0E 4.0-5.4 ABAAA Banda Sea

O: 22MAR2023 01:24:13 7.8S 106.9E ML=4.4 EMSC JAVA, INDONESIA

P: 22MAR2023 151707 7.0S 106.0E 4.0-5.5 AAAAA So. of Java

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

CENTRAL AND SOUTH AMERICA

O: 22MAR2023 00:43:53 15.4N 94.3W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO

P: 22MAR2023 151718 15.0N 95.0W 3.5-5.3 AAAAA Chiapas, Mexico

O: 22MAR2023 02:24:20 15.4N 95.7W ML=4.2 EMSC OFFSHORE OAXACA, MEXICO

O: 22MAR2023 05:11:04 15.4N 95.7W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO

O: 21MAR2023 23:37:37 15.9N 96.4W ML=4.2 EMSC OAXACA, MEXICO

P: 24MAR2023 151735 15.0N 96.0W 3.5-5.4 BAAAA Oaxaca, Mexico

P: 25MAR2023 151719 16.0N 95.0W 3.5-5.5 BAAAA Chiapas, Mexico

O: 22MAR2023 05:59:27 17.5N 94.7W ML=4.0 EMSC VERACRUZ, MEXICO

P: 17MAR2023 151435 18.0N 95.0W 3.5-5.2 BAAAA Chiapas, Mexico

O: 21MAR2023 20:43:19 18.2N 101.8W ML=4.0 EMSC GUERRERO, MEXICO

P: 21MAR2023 151731 18.0N 102.0W 3.5-5.6 AAAAA Michoacan, Mexico

O: 21MAR2023 18:33:02 18.6N 73.3W ML=3.5 EMSC HAITI REGION

P: 25MAR2023 151739 19.0N 73.0W 3.4-5.4 BAAAA Puerto Rico

O: 21MAR2023 22:09:20 19.1N 66.3W Md=3.1 EMSC PUERTO RICO REGION

P: 22MAR2023 151744 20.0N 66.0W 3.0-5.0 AAAAA Bahamas/No. Caribbean

O: 21MAR2023 11:05:28 19.5N 102.5W ML=4.0 EMSC MICHOACAN, MEXICO

P: 21MAR2023 151731 18.0N 102.0W 3.5-5.6 ABAAA Michoacan, Mexico

O: 21MAR2023 17:38:13 33.6S 71.3W Mw=5.6 EMSC VALPARAISO, CHILE

P: 23MAR2023 151946 33.0S 72.0W 4.0-5.8 AAAAA Central Chile

AFRICA AND EUROPE

O: 22MAR2023 00:01:09 24.4N 33.3E ML=4.0 EMSC EGYPT

P: 11MAR2023 151458 19.0N 39.0E 3.0-5.2 CCCAA Sudan

O: 21MAR2023 17:49:51 38.0N 37.6E ML=4.0 EMSC CENTRAL TURKEY

P: 27MAR2023 151820 38.0N 38.0E 3.5-5.0 CAAAA Turkey

O: 22MAR2023 04:51:00 45.5N 26.3E ML=3.8 EMSC ROMANIA

P: 24MAR2023 151860 46.0N 25.0E 3.0-5.0 AAAAA Romania/NW Turkey

O: 21MAR2023 16:56:41 65.8N 17.7W ML=3.5 EMSC ICELAND

P: 21MAR2023 151901 66.0N 17.0W 3.0-4.6 AAAAA Iceland area

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

SOUTHWEST PACIFIC

O: 21MAR2023 11:30:37 19.8S 170.2E mb=4.7 EMSC VANUATU

P: 23MAR2023 151928 19.0S 168.0E 4.0-5.6 AABAA Vanuatu Islands

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

OCEAN RIDGES

O: 22MAR2023 02:25:30 59.7S 26.2W mb=5.3 EMSC SOUTH SANDWICH ISLANDS REGION

P: 21MAR2023 151964 58.0S 25.0W 4.0-5.9 ABAAA So. Sandwich Islands

P: 25MAR2023 151965 61.0S 26.0W 4.0-5.8 BBAAA Southern Ocean

O: 21MAR2023 20:46:54 28.4N 43.6W mb=5.0 EMSC NORTHERN MID-ATLANTIC RIDGE

P: 18MAR2023 151468 29.0N 44.0W 4.0-5.8 BAAAA Mid-Atlantic Ridge

O: 21MAR2023 20:41:08 28.6N 43.6W mb=4.9 EMSC NORTHERN MID-ATLANTIC RIDGE

O: 21MAR2023 20:49:21 28.6N 43.7W mb=5.0 EMSC NORTHERN MID-ATLANTIC RIDGE

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: 22MAR2023 01:46:41 29.3N 130.4E mb=4.7 EMSC RYUKYU ISLANDS, JAPAN

P: 19MAR2023 151498 31.0N 131.0E 3.5-4.9 BBAAA Kyushu, Japan area

O: 22MAR2023 03:19:15 33.3N 137.8E mb=4.2 EMSC NEAR S. COAST OF HONSHU, JAPAN

P: 21MAR2023 151774 33.0N 138.0E 3.5-5.1 AAAAA Central/So. Honshu Japan

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 21MAR2023 17:36:32 30.7N 116.2W ML=3.6 EMSC OFFSHORE BAJA CALIFORNIA, MEXI

P: 22MAR2023 151802 30.8N 116.3W 2.5-4.6 AAAAA So. California

O: 21MAR2023 17:30:16 31.5N 115.6W ML=3.4 EMSC BAJA CALIFORNIA, MEXICO

P: 21MAR2023 151803 32.4N 115.8W 2.5-4.8 AAAAA So. California

O: 21MAR2023 08:15:16 32.4N 115.2W Ml=2.0 EMSC BAJA CALIFORNIA, MEXICO

P: 21MAR2023 151803 32.4N 115.8W 2.5-4.8 AAAAA So. California

O: 21MAR2023 23:24:40 33.5N 116.7W Ml=2.3 EMSC SOUTHERN CALIFORNIA

O: 22MAR2023 03:21:34 33.5N 116.6W Ml=2.6 EMSC SOUTHERN CALIFORNIA

O: 21MAR2023 20:47:34 33.5N 116.7W Ml=2.1 EMSC SOUTHERN CALIFORNIA

P: 26MAR2023 151804 33.4N 116.7W 2.5-4.6 BAAAA So. California

NEIC reported this earthquake of M 2.6 in Southern California was felt with intensity II-III in the area(s) of Southern California in Rancho Mirage.

O: 21MAR2023 15:45:42 33.5N 118.3W Ml=2.3 EMSC SAN PEDRO CHANNEL, CALIFORNIA

P: 22MAR2023 151806 34.0N 118.7W 2.5-4.7 AAAAA So. California

O: 22MAR2023 02:05:52 35.1N 119.0W Ml=2.0 EMSC CENTRAL CALIFORNIA

P: 24MAR2023 151809 34.7N 119.0W 2.5-4.6 AAAAA So. California

O: 21MAR2023 23:11:16 36.7N 121.3W Md=2.2 EMSC CENTRAL CALIFORNIA

P: 21MAR2023 151769 36.7N 121.4W 2.5-4.6 AAAAA Central California

O: 21MAR2023 19:41:23 38.0N 122.9W Md=2.5 EMSC OFFSHORE NORTHERN CALIFORNIA

P: 24MAR2023 151770 38.0N 122.3W 2.5-4.6 BAAAA 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 San Francisco, Oakland, and Sam Ramon.

O: 21MAR2023 17:32:57 38.4N 122.8W MD=2.4 EMSC NORTHERN CALIFORNIA

P: 26MAR2023 151771 38.5N 122.7W 2.5-4.6 BAAAA Central California

O: 22MAR2023 05:49:22 38.8N 122.8W Md=2.0 EMSC NORTHERN CALIFORNIA

O: 21MAR2023 18:18:31 38.8N 122.8W Md=2.8 EMSC NORTHERN CALIFORNIA

P: 24MAR2023 151771 38.8N 122.8W 2.5-4.6 BAAAA Central California

NEIC reported this earthquake of M 2.8 in Northern California was felt with intensity II-III in the area(s) of Northern California in Kelseyville, Calistoga, Boonville.

O: 21MAR2023 23:18:20 40.6N 124.4W Mw=4.5 EMSC OFFSHORE NORTHERN CALIFORNIA

P: 22MAR2023 151852 40.7N 124.6W 2.5-4.6 AAAAA Off Coast of No. Calif

O: 22MAR2023 06:56:30 41.9N 119.6W ml=2.0 EMSC NEVADA

P: 22MAR2023 151828 40.5N 119.5W 2.5-4.8 ABAAA California/Nevada area

P: 22MAR2023 151828 41.3N 118.7W 2.5-4.8 AAAAA California/Nevada area

ALASKA

O: 21MAR2023 15:57:12 53.1N 172.4E mb=4.3 EMSC NEAR ISLANDS, ALEUTIAN ISLANDS

P: 22MAR2023 151882 53.0N 171.0E 4.0-5.6 AAAAA Near Islands

O: 21MAR2023 09:13:31 56.9N 158.1W ML=3.0 EMSC ALASKA PENINSULA

P: 14MAR2023 151588 54.8N 158.7W 3.5-4.9 CCAAA Alaska Peninsula

O: 22MAR2023 02:22:40 62.0N 146.8W ML=3.6 EMSC CENTRAL ALASKA

P: 27MAR2023 151897 61.3N 147.2W 3.2-4.9 BAAAA Central Alaska

NEIC reported this earthquake of M 3.5 in Central Alaska was felt with intensity II-III in the area(s) of Central Alaska in Talkeetna, Willow, Matanuska-Susitna Borough, Wasilla, Chugiak, Anchorage and Eagle River.

O: 22MAR2023 03:40:24 62.1N 150.4W ml=3.5 EMSC CENTRAL ALASKA

P: 23MAR2023 151900 62.9N 150.2W 3.2-5.3 AAAAA Central Alaska

NEIC reported this earthquake of M 3.4 in Central Alaska was felt with intensity II-III in the area(s) of Central Alaska in Glennallen.

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

O: 22MAR2023 01:18:26 43.6N 128.2W ML=3.3 EMSC OFF COAST OF OREGON

P: 23MAR2023 151854 43.9N 128.4W 3.0-4.7 AAAAA Off Coast of Oregon

NEIC reported this earthquake of M 3.3 off the coast of Oregon was felt with intensity II-III in the area(s) of Oregon in Port Orford and Rockaway Beach.

O: 21MAR2023 15:16:10 56.1N 116.6W ML=2.9 EMSC ALBERTA, CANADA

P: 22MAR2023 151871 56.0N 116.0W 2.0-4.1 AAAAA Alberta

O: 21MAR2023 18:16:20 50.1N 129.6W MB=3.2 ECAN of Port Alice, BC

P: 21MAR2023 151865 49.9N 130.2W 2.8-5.1 AAAAA Vancouver Island area

ROCKY MOUNTAINS REGION

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

EASTERN U.S./CANADA

O: 21MAR2023 23:40:37 28.7N 98.3W ML=2.0 EMSC SOUTHERN TEXAS

O: 21MAR2023 13:04:24 28.6N 98.3W ML=2.2 EMSC SOUTHERN TEXAS

P: 27MAR2023 151754 28.0N 98.0W 3.0-4.7 CAAAA Northern Mexico

O: 21MAR2023 09:50:44 36.6N 89.6W Md=2.0 EMSC SOUTHEASTERN MISSOURI

P: 23MAR2023 151787 36.0N 89.0W 2.0-4.3 AAAAA New Madrid area

O: 21MAR2023 23:10:54 47.7N 70.1W MB=0.7 ECAN of La Malbaie, QC

O: 21MAR2023 20:49:25 48.2N 69.4W MB=1.9 ECAN of Trois-Pistoles, QC

O: 21MAR2023 10:17:54 47.5N 69.9W MB=2.0 ECAN of Saint-Pascal, QC

P: 19MAR2023 151564 47.3N 70.5W 2.0-4.4 AAAAA New England

O: 21MAR2023 06:56:56 68.9N 53.4W MB=4.7 ECAN of Qeqertasuaq, GL

P: 17MAR2023 151613 69.0N 53.0W 2.5-4.0 BAAAA Baffin/Davis Strait Canada

P: 21MAR2023 151892 67.0N 54.0W 2.5-4.2 ABAAA Baffin/Davis Strait Canada

HAWAII

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

MODERATELY STRONG QUAKES IN COSTA RICA AND ROMANIA

EARTHQUAKE SUMMARY FOR MARCH 20, 2023

A moderately strong earthquake of M 5.5 was widely felt in the region of Costa Rica today. NEIC reported maximum intensity IV in Costa Rica in Puntarenas at Quepos, and in San Jose in Mercedes, Santiago and San Isidro with III shaking in Parrita, Palmares, Daniel Flores, Tobosi, Paraiso, and Escazu. A regional foreshock of M 4.4 was felt with intensity III in San Jose, Costa Rica at San Rafael and Sabanilla. This event was probably promoted by strong tidal stresses associated with today's new moon as it occurred at the longitude of maximum tidal stress with this alignment as noted in this and previous issues of this summary:

The M 5.5 in Costa Rica today is the strongest earthquake in Costa Rica within about 150 km of this epicenter since an M 6.0 on August 24, 2020. At the time this summary noted in this regard:

"The last earthquake in Costa Rica with M>=6.0 within about 200 km of today's epicenter occurred as an M 6.5 on November 13, 2017. Events of M 6.0-6.2 occurred about 250 km to the southeast of today's epicenter on June 26 and May 12, 2019 and on August 17, 2018." (August 24, 2020)

Forecast 151433 had expected today's event within about 50 km was likely around

March 20, 2023. This activity is at 144-146 degrees from the M 7.6 in the Banda Sea of January 9, 2023 and the M 7.2 in Molucca of January 18 and may have been promoted by energy from those sources..

O: 21MAR2023 01:44:15 9.5N 84.2W Mw=5.5 EMSC COSTA RICA

O: 21MAR2023 03:54:30 9.6N 84.0W ML=4.0 EMSC COSTA RICA

P: 20MAR2023 151433 10.0N 84.0W 3.5-5.6 AAAAA Caribbean Sea

An M 4.9 aftershock was also widely felt today in southern Romania. NEIC reported maximum intensity IV in Barna, Timis and Targu, Jiu Gorj, Romania. Lesser shaking of II-III was felt in Romania at Danesti, Lupeni, Sarmizegetusa, Simeria, Deva, Hunedoara, Craiova, Dragasani, Dolj and Valcea and in Negotin, Serbia. This is the strongest aftershock to date of the M 5.6 in Romania of February 14, 2023. Forecast 151860 had expected today's event within about 15 km was likely in Romania around March 21, 2023. This epicenter is at 103 degrees from the M 6.9 in Ecuador of March 18, 2023 and was probably promoted by energy from those sources. An M 4.4 today in Greece was similarly located with respect to Ecuador.

O: 20MAR2023 14:02:16 45.1N 23.1E ML=4.9 EMSC ROMANIA

P: 21MAR2023 151860 45.0N 23.0E 3.0-5.0 AAAAA Romania/NW Turkey

An M 3.8 in eastern Romania occurred within minutes of local solar midnight and may have been promoted by tidal stresses which maximize near this hour. Forecast 151577 and 151860 had expected this activity in mid-March.

O: 20MAR2023 21:49:26 45.5N 26.4E ML=3.8 EMSC ROMANIA

P: 16MAR2023 151577 46.0N 27.0E 3.0-4.9 BAAAA Romania/NW Turkey

P: 24MAR2023 151860 46.0N 25.0E 3.0-5.0 BAAAA Romania/NW Turkey

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the Fox Islands, Aleutians. NEIC reported it was felt with intensity IV in the Fox Islands in Nikolski. The last earthquake in the Fox Islands within about 200 km of this epicenter with M>=4.9 was an M 4.9 on December 5, 2022 and prior to that an M 5.5 on November 21, 2022. At the time of that event this summary noted:

"The last earthquake in the Fox Islands within about 200 km of today's epicenter was an M 6.6 and 6.8 on January 11, 2022. At the time this summary noted in this regard:

"Strong earthquakes of M 6.8 and M 6.4 shook the region of the Fox Islands, Aleutians, Alaska today. NEIC reported the M 6.8 was felt with intensity VI in Nikolski; IV in Dutch Harbor, Unalaska, False Pass and II-III in Akutan, Atka, Cold Bay, and Adak, Alaska. The M 6.4 aftershock was reported with intensity IV in Nikolski, Alaska and III in Unalaska. An aftershock of M 5.8 was also reported felt with intensity IV in Nikolski and Dutch Harbor, Alaska. The last earthquake within about 250 km of this epicenter in the Fox Islands with M>=6.8 was an M 6.9 on July 27, 2015 about 150 km west of today's epicenter." (January 11-12, 2022, November 21, 2022)

Forecast 151599 and 151879 had expected today's event was likely within about 100 km of this epicenter around March 18-21.

O: 20MAR2023 23:25:28 53.9N 169.8W mb=4.9 EMSC FOX ISLANDS, ALEUTIAN ISLANDS

P: 18MAR2023 151599 52.4N 169.4W 3.5-5.0 AAAAA Fox Islands, Aleutians

P: 21MAR2023 151879 52.7N 169.2W 3.5-5.0 AAAAA Fox Islands, Aleutians

O: 21MAR2023 06:56:56 69.1N 53.4W mb=4.6 EMSC WESTERN GREENLAND

P: 17MAR2023 151613 69.0N 53.0W 2.5-4.0 BAAAA Baffin/Davis Strait Canada

P: 21MAR2023 151892 67.0N 54.0W 2.5-4.2 ABAAA Baffin/Davis Strait Canada

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 21MAR2023 01:45:20 23.5N 121.5E Mw=5.2 EMSC TAIWAN

O: 21MAR2023 01:45:19 23.7N 121.3E ML=5.3 TAI Hualien, Taiwan

O: 21MAR2023 01:46:12 23.6N 121.3E ML=4.4 TAI Hualien, Taiwan

P: 24MAR2023 151760 23.0N 122.0E 4.0-5.4 BAAAA Taiwan

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

The aftershock of M 4.4 was felt with intensity IV in Hualien, II in Nantou and I in Taitung, Yunlin, Taichung, Yilan Counties, Taiwan.

NEIC reported this earthquake of M 5.2 in Taiwan was felt with intensity II-III in the area(s) of Taiwan in Hualien, Changhua, Taipei Counties.

O: 20MAR2023 18:38:08 44.3N 81.1E mb=4.5 EMSC NORTHERN XINJIANG, CHINA

P: 19MAR2023 151556 42.0N 83.0E 4.0-5.4 ACBAA Kirgizstan/Xinjiang

O: 21MAR2023 05:02:22 53.2N 159.8E ML=4.1 EMSC NEAR EAST COAST OF KAMCHATKA

P: 22MAR2023 151877 54.0N 160.0E 4.0-5.7 AAAAA E. of Kamchatka

INDONESIA AND PHILIPPINES

O: 21MAR2023 01:21:16 3.5N 97.8E ML=3.3 EMSC NORTHERN SUMATRA, INDONESIA

P: 22MAR2023 151688 2.0N 98.0E 4.0-5.4 ABAAA So. Sumatera

O: 20MAR2023 18:56:09 5.4S 147.0E mb=4.4 EMSC EASTERN NEW GUINEA REG., P.N.G

P: 23MAR2023 151702 6.0S 148.0E 4.0-5.5 BAAAA New Ireland

NEIC reported this earthquake of M 4.4 in New Guinea was felt with intensity II-III in the area(s) of New Guinea in Kainantu, Eastern Highlands.

O: 20MAR2023 21:13:28 7.4N 123.8E mb=4.5 EMSC MINDANAO, PHILIPPINES

P: 30MAR2023 151677 7.0N 124.0E 4.0-5.4 CAAAA Central Philippines

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

CENTRAL AND SOUTH AMERICA

O: 20MAR2023 10:20:56 2.7S 81.2W ML=4.4 EMSC NEAR COAST OF ECUADOR

P: 27MAR2023 151695 3.0S 80.0W 4.0-5.4 CAAAA Ecuador

O: 21MAR2023 01:44:15 9.5N 84.2W Mw=5.5 EMSC COSTA RICA

O: 21MAR2023 03:54:30 9.6N 84.0W ML=4.0 EMSC COSTA RICA

P: 20MAR2023 151433 10.0N 84.0W 3.5-5.6 AAAAA Caribbean Sea

O: 20MAR2023 14:11:30 10.6N 86.4W ML=4.0 EMSC OFF COAST OF COSTA RICA

O: 20MAR2023 07:09:18 10.9N 86.5W mb=4.4 EMSC OFF COAST OF COSTA RICA

P: 20MAR2023 151449 11.0N 86.0W 3.5-5.3 AAAAA Nicaragua

O: 21MAR2023 00:58:08 13.8N 92.1W ML=4.3 EMSC OFFSHORE GUATEMALA

P: 19MAR2023 151439 15.0N 92.0W 3.5-5.2 ABAAA Guatemala

O: 20MAR2023 19:01:06 16.2S 74.0W ML=4.8 EMSC NEAR COAST OF SOUTHERN PERU

P: 24MAR2023 151912 15.0S 73.0W 4.0-5.5 BBAAA Central Peru

O: 20MAR2023 10:09:58 17.4N 94.7W ML=4.1 EMSC VERACRUZ, MEXICO

O: 20MAR2023 09:38:51 16.8N 94.9W ML=4.3 EMSC OAXACA, MEXICO

P: 25MAR2023 151719 16.0N 95.0W 3.5-5.5 BAAAA Chiapas, Mexico

O: 20MAR2023 09:28:14 17.0N 101.6W ML=4.1 EMSC OFFSHORE GUERRERO, MEXICO

P: 23MAR2023 151730 18.0N 101.0W 3.5-5.6 BAAAA Michoacan, Mexico

O: 21MAR2023 02:14:00 18.1N 98.8W ML=4.0 EMSC PUEBLA, MEXICO

P: 18MAR2023 151453 19.0N 99.0W 3.5-5.3 BAAAA Oaxaca, Mexico

O: 20MAR2023 13:39:54 18.3S 70.4W mb=4.3 EMSC OFFSHORE TARAPACA, CHILE

O: 21MAR2023 01:24:51 18.2S 71.3W ML=4.0 EMSC OFF COAST OF TARAPACA, CHILE

P: 18MAR2023 151651 20.0S 70.0W 4.0-5.4 BBAAA So. Peru/Bolivia

O: 20MAR2023 10:34:41 18.5N 66.7W ML=3.5 EMSC PUERTO RICO REGION

O: 21MAR2023 04:16:22 19.0N 67.2W Md=3.3 EMSC PUERTO RICO REGION

P: 21MAR2023 151738 18.0N 68.0W 3.4-5.4 AAAAA Puerto Rico

AFRICA AND EUROPE

O: 20MAR2023 15:40:34 37.3N 36.7E mb=4.1 EMSC CENTRAL TURKEY

P: 23MAR2023 151820 38.0N 36.0E 3.5-5.1 BAAAA Turkey

O: 20MAR2023 20:42:45 38.0N 37.8E ML=4.2 EMSC CENTRAL TURKEY

O: 21MAR2023 03:45:29 38.2N 37.5E ML=4.1 EMSC CENTRAL TURKEY

O: 20MAR2023 09:57:09 38.0N 37.3E ML=4.5 EMSC CENTRAL TURKEY

O: 20MAR2023 17:47:21 38.0N 38.5E ML=3.8 EMSC EASTERN TURKEY

P: 27MAR2023 151820 38.0N 38.0E 3.5-5.0 CAAAA Turkey

O: 21MAR2023 00:20:14 39.0N 21.2E ML=4.5 EMSC GREECE

P: 18MAR2023 151502 39.0N 20.0E 3.0-4.4 BAAAA No. Greece

P: 24MAR2023 151789 39.0N 21.0E 3.0-4.6 BAAAA No. Greece

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

O: 20MAR2023 14:02:16 45.1N 23.1E ML=4.9 EMSC ROMANIA

P: 21MAR2023 151860 45.0N 23.0E 3.0-5.0 AAAAA Romania/NW Turkey

O: 20MAR2023 21:49:26 45.5N 26.4E ML=3.8 EMSC ROMANIA

P: 16MAR2023 151577 46.0N 27.0E 3.0-4.9 BAAAA Romania/NW Turkey

P: 24MAR2023 151860 46.0N 25.0E 3.0-5.0 BAAAA Romania/NW Turkey

SOUTHWEST PACIFIC

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

OCEAN RIDGES

O: 21MAR2023 06:56:56 69.1N 53.4W mb=4.6 EMSC WESTERN GREENLAND

P: 17MAR2023 151613 69.0N 53.0W 2.5-4.0 BAAAA Baffin/Davis Strait Canada

P: 21MAR2023 151892 67.0N 54.0W 2.5-4.2 ABAAA Baffin/Davis Strait Canada

O: 20MAR2023 11:57:15 56.2S 27.9W mb=5.1 EMSC SOUTH SANDWICH ISLANDS REGION

P: 16MAR2023 151672 57.0S 27.0W 4.0-6.0 BAAAA So. Sandwich Islands

P: 24MAR2023 151962 56.0S 27.0W 4.0-6.2 BAAAA So. Sandwich Islands

ZEALANDIA AND AUSTRALIA REGION

O: 21MAR2023 01:54:29 35.3S 178.7E ML=3.7 EMSC OFF E. COAST OF N. ISLAND, N.Z

P: 22MAR2023 151950 35.0S 179.0E 3.0-4.4 AAAAA North Island, N.Z.

O: 20MAR2023 15:48:27 38.0S 176.7E mb=4.1 EMSC NORTH ISLAND OF NEW ZEALAND

P: 22MAR2023 151951 38.0S 177.0E 3.0-4.6 AAAAA North Island, N.Z.

NEIC reported this earthquake of M 4.1 in the Bay of Plenty, North Island, New Zealand was felt with intensity II-III in the area(s) of the Bay of Plenty, North Island, New Zealand in Kawerau, Whakatane, Te Puke.

JAPAN AND KURIL ISLANDS

O: 20MAR2023 07:08:27 29.9N 142.3E mb=4.9 EMSC IZU ISLANDS, JAPAN REGION

P: 23MAR2023 151794 31.0N 142.0E 4.0-5.4 BAAAA Off East Coast Honshu

O: 20MAR2023 12:06:20 36.1N 142.2E mb=4.6 EMSC OFF EAST COAST OF HONSHU, JAPA

P: 23MAR2023 151790 37.0N 139.0E 3.5-4.9 BABAA No. Honshu, Japan

O: 20MAR2023 21:28:39 42.4N 142.9E ML=4.6 EMSC HOKKAIDO, JAPAN REGION

P: 25MAR2023 151833 43.0N 145.0E 3.5-5.6 BABAA Hokkaido, Japan

O: 21MAR2023 04:58:05 47.6N 153.5E mb=4.7 EMSC KURIL ISLANDS

P: 12MAR2023 151580 48.0N 153.0E 3.5-5.4 CAAAA So. Kurils

P: 24MAR2023 151863 46.0N 154.0E 3.5-5.6 BBAAA So. Kurils

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 20MAR2023 21:09:50 31.4N 115.4W ML=3.4 EMSC BAJA CALIFORNIA, MEXICO

O: 20MAR2023 18:52:53 31.2N 115.5W ML=3.2 EMSC BAJA CALIFORNIA, MEXICO

P: 22MAR2023 151802 30.8N 116.3W 2.5-4.6 AAAAA So. California

O: 20MAR2023 11:33:28 31.9N 116.2W Ml=2.3 EMSC BAJA CALIFORNIA, MEXICO

O: 20MAR2023 12:40:10 32.7N 115.5W ML=2.0 EMSC SOUTHERN CALIFORNIA

P: 20MAR2023 151521 32.8N 116.0W 2.5-4.6 AAAAA So. California

P: 21MAR2023 151803 32.4N 115.8W 2.5-4.8 AAAAA So. California

O: 20MAR2023 22:07:58 34.0N 116.9W Ml=2.1 EMSC SOUTHERN CALIFORNIA

P: 20MAR2023 151520 33.9N 116.9W 2.5-4.6 AAAAA So. California

O: 20MAR2023 07:28:45 34.8N 116.3W ML=2.6 EMSC SOUTHERN CALIFORNIA

P: 18MAR2023 151524 34.6N 116.7W 2.5-4.8 AAAAA So. California

NEIC reported this earthquake of M 2.6 in Southern California was felt with intensity II-III in the area(s) of Southern California in White Water.

O: 21MAR2023 06:09:10 35.8N 121.2W Md=2.4 EMSC CENTRAL CALIFORNIA

P: 21MAR2023 151797 35.7N 121.2W 2.5-4.6 AAAAA Off So. California

O: 20MAR2023 08:23:13 37.2N 121.3W Md=2.0 EMSC NORTHERN CALIFORNIA

O: 20MAR2023 16:09:39 37.3N 121.7W ML=2.8 EMSC NORTHERN CALIFORNIA

P: 16MAR2023 151485 37.1N 121.5W 2.5-4.7 BAAAA Central California

P: 25MAR2023 151770 37.3N 121.6W 2.5-4.6 BAAAA Central California

NEIC reported this earthquake of M 3.0 near San Jose, California was felt with intensity II-III in the area(s) near San Jose, California in San Jose, Mount Hamilton, Morgan Hill among others.

O: 20MAR2023 17:21:04 37.5N 118.0W ml=2.4 EMSC CENTRAL CALIFORNIA

O: 20MAR2023 22:09:54 37.4N 118.6W Md=2.2 EMSC CENTRAL CALIFORNIA

P: 20MAR2023 151482 37.8N 118.2W 2.5-4.4 AAAAA California/Nevada area

O: 20MAR2023 07:18:33 38.8N 122.8W Md=2.1 EMSC NORTHERN CALIFORNIA

P: 18MAR2023 151487 38.9N 122.8W 2.5-4.4 AAAAA Central California

O: 20MAR2023 07:42:28 41.8N 126.0W ML=2.8 EMSC OFF COAST OF NORTHERN CALIFORN

P: 18MAR2023 151570 42.5N 126.8W 3.0-4.6 AAAAA Off Coast of Oregon

ALASKA

O: 20MAR2023 23:25:28 53.9N 169.8W mb=4.9 EMSC FOX ISLANDS, ALEUTIAN ISLANDS

P: 18MAR2023 151599 52.4N 169.4W 3.5-5.0 AAAAA Fox Islands, Aleutians

P: 21MAR2023 151879 52.7N 169.2W 3.5-5.0 AAAAA Fox Islands, Aleutians

O: 20MAR2023 12:11:23 60.1N 153.4W ML=3.6 EMSC SOUTHERN ALASKA

P: 19MAR2023 151615 60.3N 153.0W 3.2-5.0 AAAAA Central Alaska

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

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

ROCKY MOUNTAINS REGION

O: 20MAR2023 10:38:34 31.6N 104.4W ML=2.2 EMSC WESTERN TEXAS

P: 18MAR2023 151513 32.5N 104.6W 2.0-4.0 AAAAA SW U.S.A

O: 20MAR2023 10:00:29 32.8N 100.6W ML=2.0 EMSC WESTERN TEXAS

P: 17MAR2023 151514 32.6N 101.6W 2.0-4.0 BAAAA SW U.S.A

O: 21MAR2023 00:34:36 44.5N 115.2W ML=2.6 EMSC SOUTHERN IDAHO

P: 23MAR2023 151839 44.4N 115.1W 2.0-4.1 AAAAA Montana/Idaho

EASTERN U.S./CANADA

O: 21MAR2023 06:56:56 69.1N 53.4W mb=4.6 EMSC WESTERN GREENLAND

P: 17MAR2023 151613 69.0N 53.0W 2.5-4.0 BAAAA Baffin/Davis Strait Canada

P: 21MAR2023 151892 67.0N 54.0W 2.5-4.2 ABAAA Baffin/Davis Strait Canada

O: 20MAR2023 23:47:16 35.2N 97.7W ML=2.1 EMSC OKLAHOMA

P: 16MAR2023 151533 35.0N 97.0W 2.0-3.9 BAAAA Southern Plains

HAWAII

O: 20MAR2023 16:26:32 19.2N 155.5W ML=3.2 EMSC ISLAND OF HAWAII, HAWAII

P: 19MAR2023 151440 19.9N 156.1W 3.0-4.8 AAAAA Hawaii

NEIC reported this earthquake of M 3.0 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Naalehu, Captain Cook, Kailua Kona and Mililani.

ODERATE EARTHQUAKE STRIKES KENAI PENINSULA, ALASKA

EARTHQUAKE SUMMARY FOR MARCH 19, 2023

The strongest earthquake in the world today was an M 5.4 in Southern Alaska. NEIC reported it was felt with intensity V in Alaska at Anchor Point, Homer, Ninilchik, IV in Kenai National Wildlife Refuge and III in Clam Gulch, Kasilof, Soldotna, Sterling, Cooper Landing, Kenai, Anchorage, Girdwood, Iliamna, Fort Richardson, Eagle River, Willow, Wasilla, Chugiak, Palmer and Valdez. This is the largest earthquake within about 200 km of this epicenter in the Kenai Peninsula of Alaska since an M 5.8 about 100 km southwest of today's epicenter on May 27, 2019. At the time this summary noted in this regard:

“The strongest earthquake in the world today was an M 5.8 in the Kodiak Island region of Southern Alaska. NEIC reported intensity IV in Homer and Anchor point and II-III in Ninilchik, Pedro Bay, Kodiak Kenai NTL, Kasilof, Soldotna and Sterling, Alaska among others. This is the strongest earthquake in the Kodiak area within about 150 km of this epicenter since an M 7.1 to the north on January 24, 2016." (May 27, 2019)

An M 5.9 at intermediate depth also occurred about 200 km northwest of today's epicenter in the Kenai Peninsula on December 21, 2021. At the time this

summary noted:

"The strongest earthquake in the world today occurred in the Kenai area of Southern Alaska with M 5.9. NEIC reported maximum intensity V in southern Alaska at West Kenai, and IV in Anchor Point, Ninilchik, Calm Gulch, Kasilof, Soldotna, Homer, Sterling, Pedro Bay and North Lake among other communities in southern Alaska. This earthquake occurred on a day when the Wolf Sunspot number was the highest since the last solar active period six years ago

...

The last earthquake of larger magnitude within about 200 km of today's event occurred about 50 km south of today's epicenter on January 24, 2016 with M 7.1 and prior to that an M 6.2 on July 29, 2015. Both of these events were associated with strong solar outbursts. Today's earthquake occurred within minutes of local solar noon (like the M 7.2 in Northern California yesterday) and was likely promoted by strong tidal and geomagnetic stresses which maximize near this hour." (December 21, 2021)

Forecasts 151615 and 151893 had expected today's activity around March 19-21 within about 50-150 km of this epicenter. This epicenter is at the fourth node (90 degrees) from the recent earthquakes of M 6.9 and 7.0 in the Kermadec Islands and may have been promoted by energy from those sources. Other activity at this distance from the Kermadec Islands today included events in Colorado, Texas, Queen Charlotte Island, Guerrero, Mexico.

O: 19MAR2023 15:06:26 59.6N 151.9W Mw=5.4 EMSC KENAI PENINSULA, ALASKA

P: 19MAR2023 151615 60.3N 153.0W 3.2-5.0 AAAAA Central Alaska

P: 21MAR2023 151893 59.5N 151.2W 3.2-4.9 AAAAA Central Alaska

This earthquake may have been precursed by a light earthquake in Nebraska on March 17, 2023 as noted in this summary:

and

Earthquakes in Nebraska and South Dakota often precede strong earthquakes along the western rim of North America and with a strong coming geomagnetic storm this is a possibility. ..." (July 18, 2022, March 17, 2023)

The second strongest earthquake in the world today was an M 4.9-5.0 in Southern Sumatra, Indonesia. This epicenter is near the antipode of the M 6.8 in Ecuador of March 18. Enhanced seismicity was expected at this time in this antipodal area in the previous issue of this summary as:

"The antipode of today's event in Ecuador is at 3N 100E in the Andaman Islands, India and Sumatra Indonesia which is an active seismic zone. Seismic enhancment in this area is likely." (March 19, 2023)

Forecast 151427 had expected today's earthquake in Sumatra within about 25 km of this epicenter was likely around March 18, 2023.

O: 19MAR2023 19:30:15 3.7S 101.9E mb=4.9 EMSC SOUTHERN SUMATRA, INDONESIA

O: 19MAR2023 19:30:15 3.7S 101.9E mb=5.0 BMG SOUTHERN SUMATRA, INDONESIA

P: 18MAR2023 151427 4.0S 102.0E 4.0-5.7 AAAAA So. of Sumatera

A light earthquake of M 3.8 also occurred in Southern Colorado today. NEIC reported it was felt with intensity IV in Trinidad and Aguilar and II-III in Weston, Walsenburg, Colorado and in Raton, New Mexico. The last earthquakes of larger magnitude then M 3.8 occurred on March 10, 2023 of two with M 4.3. This was unusually large magnitudes for this swarm as noted in this summary at the time:

"A moderate earthquake of M 4.3 occurred today in the area of Trinidad, southern Colorado. These were reported by NEIC to have been felt with maximum intensity IV in Colorado in Weston and in Raton, New Mexico and III in Colorado at Aguilar, Trinidad, Walsenburg, Fort Garland, Blanca and in New Mexico at Cimarron and Questa among others. This swarm which began in September, 2001 several days before the attack on 9-11-2001 of the Trade Center in New York City also is off and on and has been extensively investigated. No definitive conclusions on the cause of these earthquakes (or earth disturbances) has been found to this time. Today's M 4.3 occurred within about an hour of local solar midnight and may have been promoted by high tidal stresses. The last event in this region of M>4 was an M 5.3 on August 23, 2011 and occurred in conjunction with an M 5.8 near Washington D.C. on the same day which did extensive damage in the Washington area, including to the National Cathedral and the Washington Monument. This was also associated with one of the strongest Gamma Ray Bursts (GRB) recorded. The temporal relation is clear but the physical relation of these events is still fuzzy. The only other event of M>4.3 in this series occurred as an M 4.9-5.0 on August 10, 2005 and as an M 4.5 on September 5, 2001 with the initial start of these events. These events occur with approximate 11-year intervals and could be related to solar cycles of the same length." (March 10, 2023)

Forecast 151775 had expected today's event within about 25 km was likely around March 21, 2023.

O: 19MAR2023 11:10:10 37.3N 104.4W Mw=3.8 EMSC COLORADO

P: 21MAR2023 151775 37.3N 104.6W 2.0-4.3 AAAAA Colorado area

A light earthquake of M 2.5-2.9 along the Quebec-Ontario border of Canada was felt today. NEIC reported intensity II in L'Annunciation, and Sainte-Agathe-des-Monts, Quebec, Canada and in Colchester, Vermont. ECAN reported this event was lightly felt in the epicentral area. The last earthquake within about 100 km of this epicenter with M>=2.9 was an M 3.1 on March 29, 2020. An M 3.9 also occurred slightly further than this to the northwest on May 9, 2020. This summary noted this event at the time as:

"An earthquake of M 3.9-4.3 was also widely felt in southern Quebec, Canada today. NEIC reported intensity IV in Quebec at Ferre-Neuve, Mont-Laurier, Shawville, and II-III in Maniwaki, Pembroke, Buckingham, Ottawa, Kanata, Eganville and Chesterville. The last earthquake of M>=4.3 in southern Quebec within about 200 km of this epicenter was an M 4.4 on May 17, 2013." (May 9, 2020)

Today's earthquake is located at the third node (120 degrees) from the M 6.9 and 7.0 earthquakes in the Kermadec Islands of January 8 and March 16, 2023 and from the M 7.0 in Vanuatu of January 8, 2023 and the Solomon Islands M 7.0 of November 22, 2022 and was probably promoted by energy from those sources. Forecasts 151565 and 151846 had expected this epicenter to see active seismicity in mid-March.

O: 19MAR2023 20:38:12 46.0N 75.1W mb=2.5 EMSC SOUTHERN QUEBEC, CANADA

O: 19MAR2023 20:38:12 46.0N 75.1W MB=2.9 ECAN of Duhamel, QC, felt

P: 15MAR2023 151565 45.0N 75.0W 2.0-4.4 BAAAA New York State

P: 22MAR2023 151846 46.0N 75.0W 2.0-4.6 BAAAA New York State

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 20MAR2023 01:49:21 27.3N 55.1E mb=4.1 EMSC SOUTHERN IRAN

P: 22MAR2023 151758 28.0N 56.0E 3.5-4.9 AAAAA So. Iran/Persian Gulf

O: 19MAR2023 08:28:47 29.6N 51.1E mb=4.5 EMSC SOUTHERN IRAN

P: 16MAR2023 151473 29.0N 53.0E 3.5-5.1 BABAA So. Iran/Persian Gulf

P: 17MAR2023 151530 31.0N 50.0E 3.8-5.3 ABAAA So. Iran

O: 19MAR2023 17:07:33 38.1N 73.4E mb=4.5 EMSC TAJIKISTAN

P: 16MAR2023 151496 38.0N 73.0E 3.8-5.5 BAAAA Hindu Kush/Pakistan

P: 21MAR2023 151780 38.0N 74.0E 3.8-5.6 AAAAA Hindu Kush/Pakistan

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

INDONESIA AND PHILIPPINES

O: 19MAR2023 22:18:38 2.8S 128.2E mb=4.8 EMSC CERAM SEA, INDONESIA

P: 23MAR2023 151694 1.0S 127.0E 4.0-5.4 BBBAA Ceram area

O: 19MAR2023 19:30:15 3.7S 101.9E mb=4.9 EMSC SOUTHERN SUMATRA, INDONESIA

O: 19MAR2023 19:30:15 3.7S 101.9E mb=5.0 BMG SOUTHERN SUMATRA, INDONESIA

P: 18MAR2023 151427 4.0S 102.0E 4.0-5.7 AAAAA So. of Sumatera

O: 20MAR2023 01:14:50 4.3N 126.4E ML=4.2 EMSC KEPULAUAN TALAUD, INDONESIA

P: 19MAR2023 151408 4.0N 125.0E 4.0-5.7 AABAA Mindanao, Philippines

P: 23MAR2023 151686 5.0N 126.0E 4.0-5.6 BAAAA Mindanao, Philippines

O: 19MAR2023 18:33:55 6.4S 103.9E ML=3.8 EMSC SOUTHWEST OF SUMATRA, INDONESI

P: 20MAR2023 151425 6.0S 105.0E 4.0-5.4 AAAAA So. of Java

O: 19MAR2023 23:36:18 7.3S 129.9E ML=4.1 EMSC KEPULAUAN BABAR, INDONESIA

P: 25MAR2023 151713 5.0S 130.0E 4.0-5.4 CCAAA West Irian, PNG

O: 19MAR2023 12:13:52 11.6S 117.9E ML=4.4 EMSC SOUTH OF SUMBAWA, INDONESIA

P: 12MAR2023 151635 11.0S 118.0E 4.0-5.5 CAAAA So. of Indonesia

CENTRAL AND SOUTH AMERICA

O: 19MAR2023 15:15:23 5.9S 75.5W ML=4.2 EMSC NORTHERN PERU

P: 18MAR2023 151422 6.0S 79.0W 4.0-5.4 AACAA No. Peru

O: 19MAR2023 14:22:30 10.6N 86.6W ML=4.4 EMSC OFF COAST OF COSTA RICA

O: 19MAR2023 14:12:31 10.8N 86.4W mb=4.5 EMSC OFF COAST OF COSTA RICA

O: 20MAR2023 07:09:18 10.9N 86.5W mb=4.4 EMSC OFF COAST OF COSTA RICA

O: 19MAR2023 09:51:58 10.6N 86.4W mb=4.5 EMSC OFF COAST OF COSTA RICA

P: 20MAR2023 151449 11.0N 86.0W 3.5-5.3 AAAAA Nicaragua

O: 19MAR2023 07:23:50 17.0N 100.4W ML=4.0 EMSC OFFSHORE GUERRERO, MEXICO

P: 17MAR2023 151446 18.0N 101.0W 3.5-5.6 AAAAA Michoacan, Mexico

O: 19MAR2023 08:14:41 17.1S 71.1W ML=4.0 EMSC NEAR COAST OF SOUTHERN PERU

P: 14MAR2023 151634 18.0S 72.0W 4.0-5.8 BAAAA So. Peru/Bolivia

P: 19MAR2023 151633 16.0S 70.0W 4.0-5.5 ABAAA So. Peru/Bolivia

O: 19MAR2023 20:32:11 18.2N 103.4W ML=4.0 EMSC OFFSHORE MICHOACAN, MEXICO

P: 21MAR2023 151731 18.0N 102.0W 3.5-5.6 AABAA Michoacan, Mexico

O: 19MAR2023 08:29:52 18.3N 67.2W Md=3.0 EMSC PUERTO RICO

P: 18MAR2023 151454 19.0N 68.0W 3.4-5.4 AAAAA Puerto Rico

AFRICA AND EUROPE

O: 19MAR2023 12:56:44 38.0N 36.5E ML=4.2 EMSC CENTRAL TURKEY

O: 19MAR2023 12:54:25 38.0N 36.5E mb=4.3 EMSC CENTRAL TURKEY

P: 17MAR2023 151537 38.0N 36.0E 3.5-5.2 AAAAA Turkey

O: 19MAR2023 14:59:55 64.6N 17.5W ML=3.1 EMSC ICELAND

P: 16MAR2023 151620 65.0N 18.0W 3.0-4.7 BAAAA Iceland area

O: 19MAR2023 19:59:07 71.2N 8.8W ML=2.9 EMSC JAN MAYEN ISLAND REGION

P: 13MAR2023 151626 71.0N 8.0W 3.5-5.5 CAAAA Jan Mayen Isl. area

P: 23MAR2023 151909 71.0N 8.0W 3.5-5.4 BAAAA Jan Mayen Isl. area

O: 19MAR2023 10:59:11 73.0N 6.7E mb=3.9 EMSC GREENLAND SEA

P: 21MAR2023 151908 72.0N 0.0E 3.0-4.6 AAAAA Norway

SOUTHWEST PACIFIC

O: 20MAR2023 05:08:33 15.3S 177.4W mb=4.3 EMSC FIJI REGION

P: 18MAR2023 151631 15.0S 176.0W 4.0-5.6 AAAAA Samoa Islands

O: 19MAR2023 10:45:57 17.2S 179.2W mb=4.2 EMSC FIJI REGION

P: 19MAR2023 151638 18.0S 180.0W 4.0-5.4 AAAAA Tonga Islands

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

OCEAN RIDGES

O: 19MAR2023 11:09:03 73.2N 6.6E Mw=3.8 EMSC GREENLAND SEA

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: 20MAR2023 01:59:24 35.5N 140.9E Mw=4.6 EMSC NEAR EAST COAST OF HONSHU, JAP

P: 21MAR2023 151796 35.0N 140.0E 4.0-5.4 AAAAA Off East Coast Honshu

NEIC reported this earthquake of M 4.6 in Southeastern Honshu, Japan was felt with intensity II-III in the area(s) of Southeastern Honshu, Japan in Chiba Prefecture.

O: 19MAR2023 11:00:30 37.8N 141.8E ML=4.1 EMSC NEAR EAST COAST OF HONSHU, JAP

P: 17MAR2023 151531 38.0N 143.0E 4.0-5.4 AAAAA So. of Honshu

O: 20MAR2023 07:08:27 29.9N 142.3E mb=4.9 EMSC IZU ISLANDS, JAPAN REGION

P: 23MAR2023 151794 31.0N 142.0E 4.0-5.4 BBAAA Off East Coast Honshu

O: 19MAR2023 18:00:03 47.0N 150.5E mb=4.4 EMSC KURIL ISLANDS

P: 20MAR2023 151579 47.0N 146.0E 3.5-5.4 AACAA So. Kurils

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 19MAR2023 07:27:03 30.8N 116.4W ML=3.6 EMSC OFFSHORE BAJA CALIFORNIA, MEXICO

O: 19MAR2023 16:29:16 30.8N 116.4W ML=3.5 EMSC OFFSHORE BAJA CALIFORNIA, MEXICO

O: 19MAR2023 20:24:10 31.0N 115.6W ML=3.3 EMSC BAJA CALIFORNIA, MEXICO

O: 19MAR2023 10:04:50 31.3N 115.3W ML=3.2 EMSC BAJA CALIFORNIA, MEXICO

O: 19MAR2023 21:47:23 30.5N 116.1W ML=3.4 EMSC OFFSHORE BAJA CALIFORNIA, MEXI

O: 19MAR2023 14:14:01 31.6N 115.7W Ml=2.7 EMSC BAJA CALIFORNIA, MEXICO

P: 17MAR2023 151515 30.7N 116.3W 2.5-4.8 AAAAA So. California

O: 20MAR2023 01:25:26 32.7N 115.5W Ml=2.2 EMSC SOUTHERN CALIFORNIA

P: 21MAR2023 151803 32.4N 115.8W 2.5-4.8 AAAAA So. California

O: 19MAR2023 09:53:32 35.5N 118.4W ML=2.6 EMSC CENTRAL CALIFORNIA

P: 18MAR2023 151527 35.6N 118.4W 2.5-4.8 AAAAA So. California

NEIC reported this earthquake of M 2.7 in Central California was felt with intensity II-III in the area(s) of Central California in Bodfish (IV) and Caliente.

O: 19MAR2023 22:18:01 36.1N 117.4W Ml=2.0 EMSC CENTRAL CALIFORNIA

P: 20MAR2023 151478 36.1N 118.1W 2.5-4.8 AAAAA California/Nevada area

O: 20MAR2023 02:14:22 36.1N 120.6W Md=2.3 EMSC CENTRAL CALIFORNIA

P: 21MAR2023 151797 35.7N 121.2W 2.5-4.6 AAAAA Off So. California

O: 19MAR2023 11:34:10 36.6N 121.3W Md=2.2 EMSC CENTRAL CALIFORNIA

O: 20MAR2023 04:10:07 36.5N 121.1W Md=2.0 EMSC CENTRAL CALIFORNIA

P: 18MAR2023 151484 36.7N 121.4W 2.5-4.7 AAAAA Central California

O: 20MAR2023 03:24:29 38.1N 122.2W Md=2.1 EMSC SAN FRANCISCO BAY AREA, CALIF.

P: 24MAR2023 151770 38.0N 122.3W 2.5-4.6 BAAAA 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 Kelseyville.

O: 19MAR2023 11:19:50 38.5N 119.5W ML=2.5 EMSC CENTRAL CALIFORNIA

P: 20MAR2023 151483 38.3N 119.3W 2.5-4.7 AAAAA California/Nevada area

O: 19MAR2023 11:35:57 38.9N 122.8W Md=2.5 EMSC NORTHERN CALIFORNIA

P: 18MAR2023 151487 38.9N 122.8W 2.5-4.4 AAAAA Central California

ALASKA

O: 19MAR2023 15:59:42 56.3N 152.3W ML=3.2 EMSC KODIAK ISLAND REGION, ALASKA

P: 25MAR2023 151903 55.0N 149.0W 3.0-5.1 CBBAA Northern Alaska

O: 20MAR2023 06:29:40 59.4N 144.8W ML=3.0 EMSC GULF OF ALASKA

P: 15MAR2023 151616 60.9N 147.4W 3.2-4.9 BBBAA Central Alaska

O: 19MAR2023 15:06:26 59.6N 151.9W Mw=5.4 EMSC KENAI PENINSULA, ALASKA

P: 19MAR2023 151615 60.3N 153.0W 3.2-5.0 AAAAA Central Alaska

P: 21MAR2023 151893 59.5N 151.2W 3.2-4.9 AAAAA Central Alaska

O: 19MAR2023 10:12:11 63.1N 151.0W mb=4.1 EMSC CENTRAL ALASKA

P: 19MAR2023 151618 63.2N 151.4W 3.2-5.1 AAAAA Central Alaska

NEIC reported this earthquake of M 3.7 in Central Alaska was felt with intensity II-III in the area(s) of Central Alaska in Matanuska-Susitna Borough, Talkeetna and Eagle River.

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

O: 17MAR2023 12:21:51 51.7N 131.1W MB=3.3 ECAN of Village of Queen Charlotte, B

P: 20MAR2023 151596 53.0N 132.0W 3.0-5.4 BBAAA British Colombia

ROCKY MOUNTAINS REGION

O: 19MAR2023 20:11:30 31.6N 104.5W ML=2.5 EMSC WESTERN TEXAS

O: 19MAR2023 09:16:07 31.7N 104.2W ML=2.2 EMSC WESTERN TEXAS

O: 19MAR2023 13:29:28 31.7N 104.4W ML=3.3 EMSC WESTERN TEXAS

O: 19MAR2023 13:39:29 31.7N 104.3W ML=2.7 EMSC WESTERN TEXAS

O: 19MAR2023 11:24:16 31.6N 104.5W ML=2.2 EMSC WESTERN TEXAS

P: 18MAR2023 151513 32.5N 104.6W 2.0-4.0 AAAAA SW U.S.A

O: 19MAR2023 11:10:10 37.3N 104.4W Mw=3.8 EMSC COLORADO

P: 21MAR2023 151775 37.3N 104.6W 2.0-4.3 AAAAA Colorado area

O: 19MAR2023 16:42:41 44.8N 111.0W Ml=2.3 EMSC YELLOWSTONE NAT. PARK, WYOMING

P: 16MAR2023 151586 44.2N 110.8W 2.0-4.3 BAAAA Yellowstone/Wyoming

EASTERN U.S./CANADA

O: 20MAR2023 03:35:41 37.0N 98.1W ML=2.5 EMSC OKLAHOMA

P: 18MAR2023 151534 37.0N 96.0W 2.0-4.2 AABAA Southern Plains

NEIC reported this earthquake of M 2.5 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma in Broken Arrow.

O: 19MAR2023 20:38:12 46.0N 75.1W mb=2.5 EMSC SOUTHERN QUEBEC, CANADA

O: 19MAR2023 20:38:12 46.0N 75.1W MB=2.9 ECAN of Duhamel, QC, felt

P: 15MAR2023 151565 45.0N 75.0W 2.0-4.4 BAAAA New York State

P: 22MAR2023 151846 46.0N 75.0W 2.0-4.6 BAAAA New York State

O: 19MAR2023 19:40:43 45.6N 77.0W MB=2.0 ECAN of Eganville, ON

P: 15MAR2023 151565 45.0N 75.0W 2.0-4.4 BABAA New York State

O: 17MAR2023 09:06:18 68.8N 69.1W MB=2.8 ECAN of Clyde River, NU

O: 17MAR2023 10:22:49 68.9N 68.9W MB=2.5 ECAN of Clyde River, NU

O: 17MAR2023 22:46:49 72.0N 75.4W MB=2.4 ECAN of Pond Inlet, NU

P: 29MAR2023 151907 73.3N 73.5W 2.5-3.9 AAAAA Baffin/Davis Strait Canada

O: 17MAR2023 07:24:07 47.5N 70.2W MB=1.2 ECAN of La Pocati├¿re, QC

P: 19MAR2023 151564 47.3N 70.5W 2.0-4.4 AAAAA New England

HAWAII

O: 19MAR2023 08:25:34 19.2N 155.4W ML=3.2 EMSC ISLAND OF HAWAII, HAWAII

P: 15MAR2023 151440 19.0N 155.2W 3.0-4.7 BAAAA Hawaii

P: 19MAR2023 151440 19.9N 156.1W 3.0-4.8 AAAAA Hawaii

STRONG EARTHQUAKE DEADLY IN ECUADOR

EARTHQUAKE SUMMARY FOR MARCH 18, 2023

A strong M 6.7-6.8 hit the coast of Western Ecuador and northern Peru today.

NEIC reported it was felt with maximum intensity IX at Balao, Guayas, Ecuador; VIII in Naranjito; VI in Naranjal, VI in Plahyas, Guayaquil, Santa Lucia, Cuenca Azuay, V in Samborondon, Eloy Alfaro among others. Initial news reports indicate extensive but minor damage to buildings and structures with at least eleven people killed in the quake including one in Peru. Much of the damage and casualties occurred in Cuenca and Machala when walls collapsed. The epicenter was near Balao about two hours from Guayaquil. It was felt in at least 13 provinces of Ecuador. Many communities lost power and a two-story home and wharf collapsed. No tsunami was observed nor expected.

The time of this earthquake in Ecuador was within about 12 minutes of local solar noon at a longitude near the longitude of maximum tidal stress (see above) with the coming new moon. It is likely this earthquake was promoted by strong tidal stresses associated with the new moon of March 21 as noted in this and previous issues of this summary as:

This epicenter is also near 90 degrees (node 4) from the major earthquakes in the Kermadec Islands of March 4 and March 16 and near 103 degrees from the major quakes in Turkey of February 6 and may have been promoted by energy from those sources. A smaller event north of this in Ecuador occurred yesterday and was reported in this summary in the previous issue as:

"Seismicity also continued near 103 degrees from the Kermadec Islands today. This includes distances from the M 6.9 of March 4, 2023 and of March 16, 2023 (M 7.0). Examination of the daily earthquake map shows much of the activity near 103 degrees from the current Kermadec Islands earthquake lies on the low side of 100-103 degrees, but near the 103 distance from the first event in that region. Among earthquakes today included two of M 5.0 and 4.3 in Ecuador." (March 17-18, 2023)

O: 17MAR2023 19:19:23 0.3S 80.7W mb=4.5 EMSC NEAR COAST OF ECUADOR

P: 13MAR2023 151415 1.0S 81.0W 4.0-5.6 BAAAA Ecuador

Today's earthquake of M 6.7 is the strongest in Ecuador within about 200 km of this epicenter in at least 35 years. An M 7.5 hit about 300 km northeast of this on February 22, 2019 and another was an M 7.1 on August 12, 2010. These were both at intermediate epicenters and were felt on the surface with moderate intensity as reported on February 22, 2019:

"A major earthquake of M 7.5 (EMSC) to 7.7 (IGP) hit the coast of Ecuador today. It occurred at an intermediate depth of 132 km and was felt with moderate intensity throughout much of Ecuador. NEIC reported maximum intensity V-VII in Ecuador was felt … in general within about 1000 km from the epicenter.

IGP reported intensity V in Pastaza with an aftershock of M 5.7 felt with III in Zarumilla, Peru. Some damage was reported. News sources on the web reported

NEIC reported this aftershock at M 5.5 was felt in Ecuador with intensity V in Guayaquil, and Santa Lucia, and II-III in Ecuador at Eloy Alfara, Guayas, Cuenca Azuay, Machala, Pajan, Santa Elena, Montecristi, Banos and Manta, Ecuador. No injuries associated with the quake. This was probably due to the intermediate depth. A shallow quake would have caused considerable damage and destruction. A slightly larger quake of M 7.8 on April 16, 2016 killed more than 700 people and destroyed hundreds of buildings and cost more than $3 billion in damages. Earthquakes of this size in Ecuador can help promote seismicity in California several months later. This summary will follow this in future issues.

...

The last earthquake located within about 250 km of today's M 7.5 occurred more than 30 years ago. The only comparable event in the region in this time period was the M 7.8 off Ecuador on April 16, 2016. That event occurred about 350 km northwest of today's epicenter." (February 22, 2019)

Forecast 151415 had expected today's earthquake was likely within about 100-150 km around March 17. The antipode of today's event in Ecuador is at 3N 100E in the Andaman Islands, India and Sumatra Indonesia which is an active seismic zone. Seismic enhancement in this area is likely. A minor earthquake hit at the antipode yesterday as:

O: 17MAR2023 11:33:21 1.7N 99.1E ML=3.0 EMSC NORTHERN SUMATRA, INDONESIA

P: 17MAR2023 151410 3.0N 99.0E 4.0-5.4 ABAAA So. Sumatera

Today's mainshock is at 148 degrees from the M 7.6 of January 9, 2023 and at the third node (120 degrees) from the M 7.0 in the Solomon Islands of November 22, 2022 and at the sixth node (60 degrees) from the M 6.4 off Northern California of December 20, 2022 and may have been promoted by energy from those sources.

O: 18MAR2023 17:22:37 2.9S 79.8W ML=4.1 EMSC NEAR COAST OF ECUADOR

O: 18MAR2023 17:22:38 2.9S 80.0W ML=4.7 EPN NEAR COAST OF ECUADOR

O: 18MAR2023 17:55:33 2.9S 79.9W ML=4.0 EMSC NEAR COAST OF ECUADOR

O: 18MAR2023 17:55:33 2.8S 79.9W ML=3.8 EPN NEAR COAST OF ECUADOR

O: 19MAR2023 09:47:25 2.4S 77.0W ML=3.6 EPN NEAR COAST OF ECUADOR

O: 18MAR2023 17:12:53 2.8S 79.9W ML=6.7 EPN NEAR COAST OF ECUADOR

O: 18MAR2023 17:12:55 2.8S 79.8W Mw=6.7 EMSC NEAR COAST OF ECUADOR

P: 17MAR2023 151415 2.0S 78.0W 4.0-5.5 AABAA Ecuador

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Near Islands, Aleutians, Alaska. The last earthquakes of larger magnitude in the Near Islands occurred on February 24 and M 4.5 on January 4, 2023. Forecast 151601 had expected today's event was likely within about 100 km around March 16, 2023. This epicenter is at 103 degrees from the M 6.7 in the region of Ecuador but occurred about 8 minutes before it. The relation between these two epicenters is unclear.

O: 18MAR2023 17:04:54 52.2N 172.7E mb=4.2 EMSC NEAR ISLANDS, ALEUTIAN ISLANDS

P: 16MAR2023 151601 53.0N 171.0E 4.0-5.7 AAAAA Near Islands

Moderate earthquakes of M 3.8 and M 3.9 continued the series near Mammoth Lakes, California today. This has been discussed in previous issues of this summary as for example on March 18:

"NEIC reported an earthquake of M 3.9 in California-Nevada border was felt with intensity II-III in the area(s) of California-Nevada border in Silverpeak, Nevada. This continues a strong swarm of minor earthquakes in this area which began on March 14, 2023 with an M 3.9, the largest event in the current swarm and the largest since an M 4.8 on January 6, 2022 within about 50 km of today's epicenter. At the time of the event in January, 2022 this summary noted:

"The first event of M 4.8 near Mina, Nevada was reported by NEIC to have been felt with intensity II-III in Nevada at Luning, Silverpeak, Gabbs, Goldfield, Hawthorne, Round Mountain (IV), Tonopah (IV) and Glenbrook and in California at Bishop and Yosemite National Park. This earthquake occurred within minutes of local solar midnight and was probably promoted by high tidal stresses which maximize near this hour. This is an aftershock of the M 6.5 on May 15, 2020, the strongest aftershock in the region in more than a year - since an M 4.9 on December 12, 2020." (January 6, 2022, March 18, 2023)

Forecast 151482 had expected today's event within about 50 km was likely around March 20, 2023.

NEIC reported these earthquakes of M 3.7 and M 3.9 in California/Nevada was felt with intensity II-III in the area(s) of Nevada in Silverpeak.

O: 18MAR2023 14:23:06 37.5N 118.0W Mw=3.8 EMSC CENTRAL CALIFORNIA

O: 18MAR2023 14:39:43 37.5N 118.0W ml=2.3 EMSC CENTRAL CALIFORNIA

O: 18MAR2023 07:03:42 37.5N 118.0W Mw=3.9 EMSC CENTRAL CALIFORNIA

P: 20MAR2023 151482 37.8N 118.2W 2.5-4.4 AAAAA California/Nevada area

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 19MAR2023 05:12:16 22.8N 121.1E ML=4.2 EMSC TAIWAN REGION

O: 19MAR2023 05:12:16 22.8N 121.1E ML=4.2 TAI Hualien, Taiwan

P: 20MAR2023 151474 21.0N 120.0E 4.0-5.4 ABAAA Taiwan

CWB reported this earthquake was felt with intensity III in Taitung, and I in Hualien, Kaohsiung and Pingtung Counties, Taiwan.

O: 19MAR2023 06:01:19 38.5N 73.4E ML=4.3 EMSC TAJIKISTAN

P: 16MAR2023 151496 38.0N 73.0E 3.8-5.5 BAAAA Hindu Kush/Pakistan

O: 18MAR2023 11:29:28 39.7N 69.8E mb=4.7 EMSC KYRGYZSTAN

O: 18MAR2023 11:35:22 39.7N 70.0E mb=4.3 EMSC KYRGYZSTAN

P: 16MAR2023 151496 38.0N 73.0E 3.8-5.5 ABBAA Hindu Kush/Pakistan

P: 18MAR2023 151495 37.0N 72.0E 3.8-5.2 ACBAA Hindu Kush/Pakistan

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

INDONESIA AND PHILIPPINES

O: 18MAR2023 09:06:20 1.3S 126.9E ML=4.0 EMSC KEPULAUAN SULA, INDONESIA

P: 16MAR2023 151407 2.0N 125.0E 4.0-5.4 BCBAA Mindanao, Philippines

O: 19MAR2023 06:23:26 2.5N 127.8E ML=4.5 EMSC MOLUCCA SEA

O: 18MAR2023 16:30:49 2.3N 128.9E mb=4.9 EMSC HALMAHERA, INDONESIA

O: 19MAR2023 01:25:43 2.3N 128.9E mb=4.9 EMSC HALMAHERA, INDONESIA

O: 18MAR2023 07:14:45 2.3N 128.9E mb=4.7 EMSC HALMAHERA, INDONESIA

P: 15MAR2023 151405 3.0N 129.0E 4.0-5.5 BAAAA Halmahera

O: 19MAR2023 02:45:33 3.4S 146.8E mb=4.9 EMSC BISMARCK SEA

O: 19MAR2023 03:09:07 3.6S 146.7E mb=4.7 EMSC BISMARCK SEA

O: 19MAR2023 02:55:05 3.3S 146.8E mb=4.7 EMSC BISMARCK SEA

P: 15MAR2023 151421 5.0S 146.0E 4.0-5.5 BBAAA New Ireland

O: 18MAR2023 08:50:29 5.1N 127.3E mb=4.1 EMSC PHILIPPINE ISLANDS REGION

P: 13MAR2023 151405 5.0N 127.0E 4.0-5.5 BAAAA Halmahera

O: 18MAR2023 10:05:20 7.1S 155.6E mb=4.8 EMSC SOLOMON ISLANDS

P: 17MAR2023 151428 7.0S 155.0E 4.0-5.5 AAAAA Solomon Islands

O: 18MAR2023 19:25:21 9.4S 119.0E ML=4.5 EMSC SUMBA REGION, INDONESIA

P: 20MAR2023 151429 9.0S 118.0E 4.0-5.4 AAAAA Sumbawa Island area

O: 18MAR2023 23:14:46 18.1S 178.0W mb=4.8 EMSC FIJI REGION

P: 17MAR2023 151638 18.0S 177.0W 4.0-5.6 AAAAA Tonga Islands

CENTRAL AND SOUTH AMERICA

O: 18MAR2023 17:22:37 2.9S 79.8W ML=4.1 EMSC NEAR COAST OF ECUADOR

O: 18MAR2023 17:22:38 2.9S 80.0W ML=4.7 EPN NEAR COAST OF ECUADOR

O: 18MAR2023 17:55:33 2.9S 79.9W ML=4.0 EMSC NEAR COAST OF ECUADOR

O: 18MAR2023 17:55:33 2.8S 79.9W ML=3.8 EPN NEAR COAST OF ECUADOR

O: 19MAR2023 09:47:25 2.4S 77.0W ML=3.6 EPN NEAR COAST OF ECUADOR

O: 18MAR2023 17:12:53 2.8S 79.9W ML=6.7 EPN NEAR COAST OF ECUADOR

O: 18MAR2023 17:12:55 2.8S 79.8W Mw=6.7 EMSC NEAR COAST OF ECUADOR

P: 17MAR2023 151415 2.0S 78.0W 4.0-5.5 AABAA Ecuador

O: 18MAR2023 10:07:01 15.5N 96.5W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO

P: 15MAR2023 151452 16.0N 96.0W 3.5-5.3 BAAAA Oaxaca, Mexico

O: 18MAR2023 21:17:56 4.5S 77.1W ML=4.0 EMSC NORTHERN PERU

P: 18MAR2023 151422 6.0S 79.0W 4.0-5.4 ABBAA No. Peru

O: 18MAR2023 09:42:02 18.6N 106.3W ML=4.1 EMSC OFF COAST OF JALISCO, MEXICO

P: 15MAR2023 151437 19.0N 107.0W 3.5-5.5 BAAAA Coast of Jalisco, Mexico

O: 18MAR2023 11:39:45 19.5N 73.0W ML=3.2 EMSC HAITI REGION

P: 17MAR2023 151456 20.0N 74.0W 3.4-5.3 AAAAA Puerto Rico

O: 18MAR2023 06:50:07 19.7S 66.9W ML=4.6 EMSC POTOSI, BOLIVIA

P: 15MAR2023 151642 22.0S 67.0W 4.0-5.8 BCAAA Argentina

O: 19MAR2023 00:08:09 19.8N 70.9W ML=3.4 EMSC DOMINICAN REPUBLIC

P: 13MAR2023 151456 19.0N 71.0W 3.4-5.3 CAAAA Puerto Rico

O: 18MAR2023 20:30:07 23.1S 68.9W Mw=4.6 EMSC ANTOFAGASTA, CHILE

P: 14MAR2023 151646 24.0S 69.0W 4.0-5.8 BAAAA Coast No. Chile

O: 18MAR2023 07:02:57 24.0N 108.9W ML=4.2 EMSC GULF OF CALIFORNIA

P: 13MAR2023 151463 24.0N 109.0W 3.5-5.4 BAAAA Gulf of California

O: 18MAR2023 15:41:41 33.4S 68.3W mb=5.0 EMSC MENDOZA, ARGENTINA

P: 12MAR2023 151656 32.0S 67.0W 4.0-5.6 ABAAA Central Chile

NEIC reported this earthquake of M 5.0 in Argentina was felt with intensity II-III in the area(s) of Argentina in San Martin and Mendoza.

O: 18MAR2023 16:33:32 22.3N 108.5W mb=4.4 EMSC OFF COAST OF BAJA CALIFORNIA SUR

O: 18MAR2023 10:05:53 22.4N 108.3W mb=4.2 EMSC OFF COAST OF BAJA CALIFORNIA SUR

O: 18MAR2023 13:13:44 22.4N 108.4W ML=4.4 EMSC OFF COAST OF BAJA CALIFORNIA SUR

O: 19MAR2023 04:09:26 22.0N 108.8W mb=4.2 EMSC OFF COAST OF BAJA CALIFORNIA S

P: 20MAR2023 151463 20.0N 109.0W 3.5-5.1 ABAAA Gulf of California

AFRICA AND EUROPE

O: 18MAR2023 19:05:22 25.8S 29.2E ML=3.2 EMSC SOUTH AFRICA

P: 20MAR2023 151648 26.0S 28.0E 3.0-4.7 AAAAA Rep. South Africa

O: 18MAR2023 11:20:56 34.5N 13.8E ML=3.9 EMSC CENTRAL MEDITERRANEAN SEA

P: 12MAR2023 151499 35.0N 14.0E 3.0-4.6 CAAAA Mediterranean/Sicily

O: 18MAR2023 12:43:40 35.3N 35.9E ML=4.0 EMSC NEAR THE COAST OF SYRIA

P: 13MAR2023 151537 36.0N 36.0E 3.5-5.2 BAAAA Turkey

O: 18MAR2023 13:47:28 37.4N 37.2E ML=3.9 EMSC CENTRAL TURKEY

O: 18MAR2023 09:25:33 37.7N 36.5E ML=4.3 EMSC CENTRAL TURKEY

P: 17MAR2023 151537 38.0N 36.0E 3.5-5.2 AAAAA Turkey

O: 18MAR2023 07:55:42 38.2N 38.3E ML=4.0 EMSC EASTERN TURKEY

P: 14MAR2023 151537 38.0N 39.0E 3.5-5.1 BAAAA Turkey

O: 18MAR2023 14:22:16 42.0N 36.9E ML=3.0 EMSC BLACK SEA

O: 18MAR2023 14:23:53 42.0N 36.9E ML=2.9 EMSC BLACK SEA

P: 12MAR2023 151567 41.0N 36.0E 3.5-4.9 CAAAA No. Turkey/Black Sea

SOUTHWEST PACIFIC

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

OCEAN RIDGES

O: 18MAR2023 16:06:45 27.7N 18.2W ML=2.9 EMSC CANARY ISLANDS, SPAIN REGION

P: 7MAR2023 151186 28.0N 16.0W 3.0-4.5 CABAA Canary Islands

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

ZEALANDIA AND AUSTRALIA REGION

O: 19MAR2023 05:27:38 31.8S 179.8E ML=4.5 EMSC KERMADEC ISLANDS REGION

P: 16MAR2023 151662 32.0S 180.0E 4.0-5.4 BAAAA So. Kermadec Islands

O: 18MAR2023 21:42:39 38.1S 176.7E ML=4.3 EMSC NORTH ISLAND OF NEW ZEALAND

O: 18MAR2023 21:42:40 38.0S 176.7E MS=4.2 GEONET North Island, New Zealand

O: 19MAR2023 05:11:35 38.1S 176.7E ML=3.8 EMSC NORTH ISLAND OF NEW ZEALAND

P: 18MAR2023 151660 37.0S 178.0E 3.0-4.8 ABAAA North Island, N.Z.

GEONET reported the M 4.2 was felt by 866 people with 255 at weak intensity and 351 with light shaking and 212 with moderate intensity 44 with strong, 3 with severe and 1 with extreme intensity.

JAPAN AND KURIL ISLANDS

O: 18MAR2023 17:05:14 30.0N 141.9E mb=4.8 EMSC IZU ISLANDS, JAPAN REGION

O: 18MAR2023 15:51:42 29.9N 141.7E mb=4.4 EMSC IZU ISLANDS, JAPAN REGION

P: 16MAR2023 151462 28.0N 140.0E 4.0-5.4 ABBAA Bonin Islands

O: 18MAR2023 14:36:27 47.3N 153.1E mb=4.4 EMSC KURIL ISLANDS

P: 12MAR2023 151580 48.0N 153.0E 3.5-5.4 CAAAA So. Kurils

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 18MAR2023 10:39:39 30.6N 116.4W ML=3.6 EMSC OFFSHORE BAJA CALIFORNIA, MEXI

P: 17MAR2023 151515 30.7N 116.3W 2.5-4.8 AAAAA So. California

O: 18MAR2023 10:58:31 31.3N 114.3W ML=3.5 EMSC GULF OF CALIFORNIA

P: 15MAR2023 151464 30.0N 114.0W 3.5-4.9 BBAAA Gulf of California

O: 19MAR2023 01:37:08 31.7N 115.8W Ml=2.4 EMSC BAJA CALIFORNIA, MEXICO

O: 18MAR2023 16:52:06 33.2N 115.8W Mw=3.6 EMSC SOUTHERN CALIFORNIA

O: 18MAR2023 17:19:32 33.3N 115.8W ML=3.6 EMSC SOUTHERN CALIFORNIA

P: 16MAR2023 151521 33.7N 116.1W 2.5-4.8 AAAAA So. California

P: 20MAR2023 151521 32.8N 116.0W 2.5-4.6 AAAAA So. California

NEIC reported these earthquakes of M 3.4 and 3.6 in Southern California was felt with intensity II-III in the area(s) of Southern California in Niland, Thermal, Palm Desert, Cathedral City, Calipatria, Yucca Valley, El Cajon, Orange.

O: 19MAR2023 04:28:03 34.3N 116.7W Ml=2.1 EMSC SOUTHERN CALIFORNIA

P: 20MAR2023 151520 33.9N 116.9W 2.5-4.6 AAAAA So. California

O: 19MAR2023 06:14:59 35.5N 118.4W Ml=2.2 EMSC CENTRAL CALIFORNIA

O: 18MAR2023 07:00:53 35.5N 118.4W Ml=2.0 EMSC CENTRAL CALIFORNIA

P: 18MAR2023 151527 35.6N 118.4W 2.5-4.8 AAAAA So. California

O: 18MAR2023 14:25:48 37.4N 117.6W ml=2.2 EMSC NEVADA

P: 16MAR2023 151479 37.2N 117.3W 2.5-4.8 AAAAA California/Nevada area

O: 18MAR2023 10:44:44 38.8N 122.8W Md=2.1 EMSC NORTHERN CALIFORNIA

P: 18MAR2023 151487 38.9N 122.8W 2.5-4.4 AAAAA Central California

O: 18MAR2023 17:32:45 40.5N 124.3W Md=2.2 EMSC NORTHERN CALIFORNIA

O: 18MAR2023 18:52:35 40.4N 124.3W Md=2.2 EMSC NORTHERN CALIFORNIA

P: 17MAR2023 151569 40.7N 124.6W 2.5-4.8 AAAAA Off Coast of No. Calif

O: 18MAR2023 14:23:06 37.5N 118.0W Mw=3.8 EMSC CENTRAL CALIFORNIA

O: 18MAR2023 14:39:43 37.5N 118.0W ml=2.3 EMSC CENTRAL CALIFORNIA

O: 18MAR2023 07:03:42 37.5N 118.0W Mw=3.9 EMSC CENTRAL CALIFORNIA

P: 20MAR2023 151482 37.8N 118.2W 2.5-4.4 AAAAA California/Nevada area

ALASKA

O: 18MAR2023 17:04:54 52.2N 172.7E mb=4.2 EMSC NEAR ISLANDS, ALEUTIAN ISLANDS

P: 16MAR2023 151601 53.0N 171.0E 4.0-5.7 AAAAA Near Islands

O: 18MAR2023 08:08:14 56.9N 158.1W ML=3.2 EMSC ALASKA PENINSULA

P: 14MAR2023 151588 54.8N 158.7W 3.5-4.9 BCAAA Alaska Peninsula

O: 18MAR2023 15:29:15 69.1N 144.5W ML=3.0 EMSC NORTHERN ALASKA

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

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

ROCKY MOUNTAINS REGION

O: 18MAR2023 19:35:55 31.7N 104.6W ML=3.0 EMSC WESTERN TEXAS

P: 18MAR2023 151513 32.5N 104.6W 2.0-4.0 AAAAA SW U.S.A

O: 18MAR2023 23:09:59 37.2N 104.7W ML=3.1 EMSC COLORADO

P: 12MAR2023 151491 37.2N 104.9W 2.0-4.0 CAAAA Colorado area

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

EASTERN U.S./CANADA

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

HAWAII

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

REGIONAL SEISMIC ENHANCEMENT FOLLOWS M 7.0 KERMADEC ISLANDS EARTHQUAKE

EARTHQUAKE SUMMARY FOR MARCH 17, 2023

A series of moderate earthquakes hit North Island, New Zealand today. This included an M 5.3 and a number of events of M>=4. These were reported felt with maximum intensity V-VI in Matata, Paengaroa, Rotorua, Te Puke, Murupara, Opotiki, Tauranga, Kawerau, Edgecumbe, Rotorua and Whakatane, Bay of Plenty, New Zealand. This activity was probably triggered by energy from the M 7.0 in the Kermadec Islands to the north. The first in this series was an M 3.6 at 00:58 UT (EMSC data) on March 16, 2023 - two minutes after the M 7.0 in the Kermadec Islands at 00:56 UT. An earthquake in North Island in the Cook Strait area followed with M 4.2 three minutes after that. Although the first of these events occurred near local solar midnight, most of the events occurred near local solar noon and were probably promoted by tidal stresses which maximize near these hours. The last earthquake within about 200 km of these epicenters with M>=5.3 was an M 5.4 on November 30, 2022 and prior to that an M 5.5 on August 28, 2020. Of some interest, the event of November 30, 2022 was on the same day as the M 5.3 in Alberta, Canada, similar to the activity there yesterday. The last swarm in the area similar to today's activity occurred September 1-5, 2016 about 200 km northeast of today's epicenters. Forecast 151660 had expected this activity within about 100 km was likely around March 14-18. This activity is at 145-148 degrees from the major earthquakes in Turkey of February, 2023 and at the third node (120 degrees) from the M 7.2 in Tajikistan of February 23, 2023 and at the sixth node (60 degrees) from the M 7.2 in Molucca of January 18, 2023 and the seventh node (52 degrees) from the M 7.6 in Banda of January 9, 2023 and may have been promoted by energy from those sources.

NEIC reported the largest of these events were felt as follows:

O: 17MAR2023 15:31:06 38.1S 176.7E MS=4.7 GEONET 2120 people reported feeling this earthquake with 764 at weak intensity and 708 with light shaking and 468 with moderate intensity 156 with strong, 20 with severe and 4 with extreme intensity.

O: 17MAR2023 15:46:01 38.1S 176.7E MS=4.9 GEONET 2914 people reported feeling this earthquake with 1105 at weak intensity and 1068 with light shaking and 526 with moderate intensity 165 with strong, 44 with severe and 6 with extreme intensity.

O: 17MAR2023 19:58:07 38.1S 176.7E MS=4.8 GEONET 2770 people reported feeling this earthquake with 1216 at weak intensity and 914 with light shaking and 472 with moderate intensity 135 with strong, 29 with severe and 4 with extreme intensity.

O: 18MAR2023 00:42:06 43.7S 172.8E MS=4.9 GEONET Felt with light intensity in the area of Christchurch, New Zealand and in southern North Island. Of 6958 felt reports 2187 reports of light and 3691 of weak intensity with 998 of moderate shaking and 71 with strong 4 with severe and 7 with extreme intensity came from the area.

O: 17MAR2023 15:31:06 38.1S 176.7E MS=4.7 GEONET NORTH ISLAND, NZ.

O: 17MAR2023 15:46:01 38.1S 176.7E MS=4.9 GEONET NORTH ISLAND, NZ.

O: 17MAR2023 19:58:07 38.1S 176.7E MS=4.8 GEONET NORTH ISLAND, NZ.

O: 17MAR2023 20:52:49 38.1S 176.7E MS=4.2 GEONET NORTH ISLAND, NZ.

O: 17MAR2023 22:40:33 38.1S 176.7E MS=4.3 GEONET NORTH ISLAND, NZ.

O: 17MAR2023 19:58:07 38.1S 176.7E Mw=5.0 EMSC NORTH ISLAND OF NEW ZEALAND

O: 17MAR2023 20:52:49 38.1S 176.7E ML=4.2 EMSC NORTH ISLAND OF NEW ZEALAND

O: 17MAR2023 20:54:11 38.1S 176.7E ML=4.1 EMSC NORTH ISLAND OF NEW ZEALAND

O: 17MAR2023 22:28:53 38.1S 176.7E ML=3.9 EMSC NORTH ISLAND OF NEW ZEALAND

O: 17MAR2023 22:38:47 38.1S 176.7E ML=4.4 EMSC NORTH ISLAND OF NEW ZEALAND

O: 17MAR2023 22:40:33 38.1S 176.7E ML=4.3 EMSC NORTH ISLAND OF NEW ZEALAND

O: 17MAR2023 23:10:07 38.1S 176.7E ML=3.9 EMSC NORTH ISLAND OF NEW ZEALAND

O: 17MAR2023 15:46:01 38.1S 176.7E Mw=5.3 EMSC NORTH ISLAND OF NEW ZEALAND

O: 17MAR2023 15:31:06 38.1S 176.7E mb=4.8 EMSC NORTH ISLAND OF NEW ZEALAND

P: 14MAR2023 151660 38.0S 178.0E 3.0-4.4 BAAAA North Island, N.Z.

P: 18MAR2023 151660 37.0S 178.0E 3.0-4.8 ABAAA North Island, N.Z.

An earthquake of M 4.6 also occurred in southern South Island, New Zealand

in Milford Sound today. GEONET reported this earthquake was felt with weak intensity in the area southwest of Te Anau, South Island. 234 reports of felt intensity came from the area east and north of the epicenter with 162 weak, 67 light, 5 moderate, 0 strong, 0 severe and 0 extreme shaking. Forecast 151668 had expected this event within about 50 km was likely around March 18, 2023.

O: 17MAR2023 01:31:57 45.1S 167.6E ML=3.0 EMSC SOUTH ISLAND OF NEW ZEALAND

O: 17MAR2023 00:00:18 45.0S 167.5E ML=4.6 EMSC SOUTH ISLAND OF NEW ZEALAND

O: 17MAR2023 00:00:18 45.0S 167.5E MS=4.6 GEONET South Island, New Zealand

P: 18MAR2023 151668 45.0S 168.0E 3.0-5.0 AAAAA So. Island, N.Z.

An earthquake of M 4.9 was also felt in the Canterbury area of South Island

GEONET reported this earthquake was felt with light intensity in the area of Christchurch, New Zealand and in southern North Island. Of 6958 felt reports 2187 reports of light and 3691 of weak intensity with 998 of moderate shaking and 71 with strong 4 with severe and 7 with extreme intensity came from the area. today. NEIC reported this earthquake of M 4.3 in Canterbury, South Island, New Zealand was felt with intensity II-III in the area(s) of Canterbury, South Island, New Zealand in Christchurch and Lyttelton. Forecast 151667 expected today's activity was likely in this area around March 16, 2023.

O: 18MAR2023 01:09:01 43.7S 172.9E ML=3.8 EMSC SOUTH ISLAND OF NEW ZEALAND

O: 18MAR2023 00:42:06 43.7S 172.8E MS=4.9 GEONET South Island, New Zealand

P: 16MAR2023 151667 42.0S 173.0E 3.0-5.0 ABAAA So. Island, N.Z.

Seismicity also continued near 103 degrees from the Kermadec Islands today. This includes distances from the M 6.9 of March 4, 2023 and of March 16, 2023 (M 7.0). Examination of the daily earthquake map shows much of the activity near 103 degrees from the current Kermadec Islands earthquake lies on the low side of

100-103 degrees, but near the 103 distance from the first event in that region.

Among earthquakes today included an event in Myanmar and two of M 5.0 and 4.3 in Ecuador.

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the Gulf of Alaska. This is the strongest earthquake within about 200 km of this epicenter since an M 5.0 on May 2, 2016 and a similar M 5.0 on August 27, 2014. The last earthquake in this area of significantly larger magnitude than today's M 4.9, and the only such event in the area in the past 35 years was an M 5.6 on July 25, 2009. Forecast 151616 had expected today's event in this area was likely around March 15.

O: 17MAR2023 15:04:23 59.4N 145.0W mb=4.9 EMSC GULF OF ALASKA

P: 15MAR2023 151616 60.9N 147.4W 3.2-4.9 ABBAA Central Alaska

A moderate earthquake of M 4.3 also occurred today off the coast of Oregon. NEIC reported it was lightly felt with intensity II-III on the coast of Oregon at Gold Beach, Rockaway Beach, Seaside, Sherwood. Although a slightly smaller M 4.2 hit this area on March 9, the last earthquake of larger magnitude off the Coast of Oregon within about 200 km of today's epicenter was an M 5.0 on January 11, 2023. Today's event occurred near local solar midnight and was probably promoted by strong tidal stresses which maximize near this hour. Forecast 151571 had expected today's event in this area was likely around March 17.

"The strongest earthquake in the U.S. or Canada today was an M 5.0 off the coast of Oregon. NEIC reported it was felt with maximum intensity IV ... A foreshock of M 4.5 near the same epicenter was reported felt with light intensity in Rockaway Beach and Portland, Oregon. This activity occurred near local solar midnight and may have been promoted by high tidal stresses. ... The M 5.0 is the strongest earthquake in the area off the coast of Oregon within about 200 km of this epicenter since an M 5.1 on March 27, 2022." January 12, 2023)

O: 17MAR2023 08:16:05 43.7N 128.2W mb=4.3 EMSC OFF COAST OF OREGON

P: 17MAR2023 151571 44.4N 129.3W 3.0-4.6 AAAAA Off Coast of Oregon

NEIC reported an earthquake of M 3.9 in California-Nevada border was felt with intensity II-III in the area(s) of California-Nevada border in Silverpeak, Nevada. This continues a strong swarm of minor earthquakes in this area which began on March 14, 2023 with an M 3.9, the largest event in the current swarm and the largest since an M 4.8 on January 6, 2022 within about 50 km of today's epicenter. At the time of the event in January, 2022 this summary noted:

Forecast 151482 had expected today's event within about 50 km was likely

around March 20, 2023.

O: 18MAR2023 07:03:42 37.5N 118.0W Mw=3.9 EMSC CENTRAL CALIFORNIA

O: 18MAR2023 07:03:42 37.5N 118.0W mw=3.9 ANSS N of Deep Springs

P: 20MAR2023 151482 37.8N 118.2W 2.5-4.4 AAAAA California/Nevada area

A minor earthquake of M 3.4 occurred today in the South Atlantic Ocean off the west coast of Africa. It was not reported felt in this remote area. This is a highly unusual epicenter - no earthquakes have been reported at M>=3 within about 500 km of this epicenter in the past 35 years. Earthquakes near 500 km from this epicenter were recorded as an M 3.5 to the east on November 16, 2020 and as an M 4.8 to the west of today's epicenter. At the time of the event in November, 2020, this summary noted in this regard:

"An unusual earthquake of M 3.5 was widely felt in the Western Cape Province of South Africa today. NEIC reported it was felt with intensity IV in the Western Cape at Saldanha, Atlantic, and Bredasdorp and II-III in Mooreesburg, Malmesbury, Cape Town, Paarl, Steeenbosch, Somerset and Carnarvon. The last earthquake in the Cape area of South Africa with M>=3.5 within about 500 km of this epicenter occurred on December 31, 1994 with M 4.5 about 500 km northeast of today's epicenter, the only such regional event in the past 30 years." (November 16, 2020)

Like many other earthquakes today, this epicenter is near 100 degrees from the Kermadec Islands.

O: 17MAR2023 10:53:17 35.4S 13.4E ML=3.4 EMSC SOUTH ATLANTIC OCEAN

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 17MAR2023 14:34:06 23.4N 93.6E ML=3.5 EMSC MYANMAR-INDIA BORDER REGION

P: 13MAR2023 151469 24.0N 94.0E 4.0-5.4 BAAAA Myanmar

O: 18MAR2023 03:33:09 26.5N 94.2E ML=3.6 EMSC ASSAM - NAGALAND REGION, INDIA

P: 19MAR2023 151469 27.0N 97.0E 4.0-5.6 AACAA Myanmar

O: 18MAR2023 06:39:55 27.3N 55.1E mb=4.2 EMSC SOUTHERN IRAN

P: 15MAR2023 151473 28.0N 56.0E 3.5-5.0 BAAAA So. Iran/Persian Gulf

O: 17MAR2023 10:39:42 30.8N 96.1E mb=5.1 EMSC EASTERN XIZANG

P: 19MAR2023 151469 27.0N 97.0E 4.0-5.6 ACAAA Myanmar

O: 18MAR2023 00:00:54 36.5N 70.0E Mw=4.9 EMSC HINDU KUSH REGION, AFGHANISTAN

P: 15MAR2023 151495 37.0N 71.0E 3.8-5.3 BAAAA Hindu Kush/Pakistan

NEIC reported this earthquake of M 4.3 in Pakistan was felt with intensity II-III in the area(s) of Pakistan in Rawalpindi (IV), Islamabad, Abottabad and III in Dushanbe, Tajikistan.

O: 17MAR2023 18:19:10 38.3N 75.6E mb=4.7 EMSC SOUTHERN XINJIANG, CHINA

P: 16MAR2023 151496 38.0N 73.0E 3.8-5.5 AABAA Hindu Kush/Pakistan

O: 17MAR2023 08:18:26 41.9N 77.9E mb=4.0 EMSC KYRGYZSTAN

P: 17MAR2023 151555 40.0N 77.0E 4.0-5.4 ABAAA Kirgizstan/Xinjiang

INDONESIA AND PHILIPPINES

O: 17MAR2023 15:03:01 0.7S 123.7E ML=4.3 EMSC SULAWESI, INDONESIA

P: 18MAR2023 151407 0.0N 123.0E 4.0-5.4 AAAAA Mindanao, Philippines

O: 17MAR2023 11:33:21 1.7N 99.1E ML=3.0 EMSC NORTHERN SUMATRA, INDONESIA

P: 17MAR2023 151410 3.0N 99.0E 4.0-5.4 ABAAA So. Sumatera

O: 18MAR2023 07:14:40 2.3N 128.9E mb=4.7 EMSC HALMAHERA, INDONESIA

O: 18MAR2023 00:59:18 2.4N 128.9E ML=4.2 EMSC HALMAHERA, INDONESIA

P: 15MAR2023 151405 3.0N 129.0E 4.0-5.5 BAAAA Halmahera

O: 17MAR2023 19:37:59 6.0N 125.8E mb=4.7 EMSC MINDANAO, PHILIPPINES

P: 13MAR2023 151408 5.0N 126.0E 4.0-5.8 BAAAA Mindanao, Philippines

O: 17MAR2023 16:11:38 6.0N 127.0E Mw=4.8 EMSC MINDANAO, PHILIPPINES

P: 15MAR2023 151406 7.0N 127.0E 4.0-5.4 AAAAA Halmahera

O: 17MAR2023 23:42:12 6.1S 129.4E ML=4.3 EMSC BANDA SEA

P: 15MAR2023 151413 6.0S 128.0E 4.0-5.7 AAAAA Banda Sea

O: 17MAR2023 10:47:51 6.1S 147.5E mb=4.9 EMSC EASTERN NEW GUINEA REG., P.N.G

P: 15MAR2023 151421 5.0S 146.0E 4.0-5.5 ABBAA New Ireland

O: 17MAR2023 14:15:21 7.3S 129.2E mb=4.2 EMSC KEPULAUAN BABAR, INDONESIA

O: 17MAR2023 12:32:19 7.5S 129.7E ML=4.1 EMSC KEPULAUAN BABAR, INDONESIA

O: 17MAR2023 09:28:59 6.3S 130.3E ML=4.5 EMSC BANDA SEA

P: 15MAR2023 151413 6.0S 128.0E 4.0-5.7 AABAA Banda Sea

O: 17MAR2023 21:43:16 8.4S 108.9E ML=4.2 EMSC JAVA, INDONESIA

O: 17MAR2023 12:05:30 8.8S 109.8E Mw=5.0 EMSC JAVA, INDONESIA

P: 15MAR2023 151425 8.0S 108.0E 4.0-5.4 AABAA So. of Java

NEIC reported this earthquake of M 5.0 South of Java was felt with intensity II-III in the area(s) South of Java in Gombong, Surakarta, Madiun and in Yogyakarta. Indonesia.

O: 17MAR2023 10:54:22 9.0S 119.4E ML=4.7 EMSC SUMBA REGION, INDONESIA

P: 20MAR2023 151429 9.0S 118.0E 4.0-5.4 BABAA Sumbawa Island area

O: 17MAR2023 13:56:04 14.6N 120.1E mb=4.9 EMSC LUZON, PHILIPPINES

P: 16MAR2023 151443 14.0N 121.0E 3.5-5.0 AAAAA Luzon, Philippines

NEIC reported this earthquake of M 4.9 in Central Luzon, Philippines was felt with intensity II-III in the area(s) of Central Luzon, Philippines in Olongapo, Subic, Mariveles, Hermosa and in Bacoor, Southern Tagalog.

O: 17MAR2023 14:16:47 18.5N 120.2E ML=4.1 EMSC LUZON, PHILIPPINES

O: 17MAR2023 13:23:29 18.5N 120.4E mb=4.9 EMSC LUZON, PHILIPPINES

P: 15MAR2023 151444 18.0N 120.0E 3.5-4.9 AAAAA Luzon, Philippines

NEIC reported this earthquake of M 4.9 in northern Philippines was felt with intensity II-III in the area(s) of northern Philippines in Bacoor.

CENTRAL AND SOUTH AMERICA

O: 17MAR2023 16:12:02 9.6S 78.2W ML=4.0 EMSC NEAR COAST OF NORTHERN PERU

P: 11MAR2023 151422 8.0S 78.0W 4.0-5.6 CBAAA No. Peru

P: 11MAR2023 151422 9.0S 81.0W 4.0-5.6 CACAA No. Peru

O: 18MAR2023 00:22:30 10.2N 84.1W ML=4.1 EMSC COSTA RICA

O: 18MAR2023 00:24:30 10.2N 84.1W ML=4.3 EMSC COSTA RICA

P: 20MAR2023 151433 10.0N 84.0W 3.5-5.6 AAAAA Caribbean Sea

O: 17MAR2023 08:46:25 9.7S 74.8W mb=4.3 EMSC CENTRAL PERU

O: 18MAR2023 03:41:46 10.3S 73.7W mb=4.4 EMSC CENTRAL PERU

P: 12MAR2023 151629 14.0S 73.0W 4.0-5.6 CCAAA Central Peru

O: 17MAR2023 15:33:26 10.5S 78.7W ML=4.2 EMSC NEAR COAST OF CENTRAL PERU

P: 18MAR2023 151422 6.0S 79.0W 4.0-5.4 ACAAA No. Peru

O: 17MAR2023 19:19:23 0.3S 80.7W mb=4.5 EMSC NEAR COAST OF ECUADOR

P: 13MAR2023 151415 1.0S 81.0W 4.0-5.6 BAAAA Ecuador

O: 17MAR2023 16:04:45 0.5S 78.6W ML=3.7 EMSC ECUADOR

P: 17MAR2023 151415 2.0S 78.0W 4.0-5.5 ABAAA Ecuador

O: 18MAR2023 00:36:22 14.8N 92.5W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO

P: 16MAR2023 151434 14.0N 93.0W 3.5-5.1 AAAAA Chiapas, Mexico

P: 19MAR2023 151439 15.0N 92.0W 3.5-5.2 AAAAA Guatemala

O: 17MAR2023 18:10:40 15.8N 95.3W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO

P: 15MAR2023 151452 16.0N 96.0W 3.5-5.3 AAAAA Oaxaca, Mexico

O: 18MAR2023 06:40:05 17.5N 101.2W ML=4.2 EMSC GUERRERO, MEXICO

O: 18MAR2023 03:57:25 16.9N 100.0W ML=4.2 EMSC GUERRERO, MEXICO

P: 17MAR2023 151453 17.0N 99.0W 3.5-5.5 AAAAA Oaxaca, Mexico

O: 17MAR2023 13:43:56 18.2N 73.5W ML=3.3 EMSC HAITI REGION

P: 17MAR2023 151456 20.0N 74.0W 3.4-5.3 ABAAA Puerto Rico

O: 18MAR2023 06:33:44 18.7N 106.3W ML=4.2 EMSC OFF COAST OF JALISCO, MEXICO

P: 15MAR2023 151437 19.0N 107.0W 3.5-5.5 BAAAA Coast of Jalisco, Mexico

O: 17MAR2023 07:22:32 18.9N 65.1W ML=3.3 EMSC VIRGIN ISLANDS REGION

P: 15MAR2023 151441 18.0N 64.0W 3.0-5.1 AAAAA Leeward Islands

O: 17MAR2023 07:25:44 19.6N 102.4W ML=4.0 EMSC MICHOACAN, MEXICO

P: 17MAR2023 151446 18.0N 101.0W 3.5-5.6 ABBAA Michoacan, Mexico

O: 18MAR2023 06:50:07 19.7S 66.9W ML=4.6 EMSC POTOSI, BOLIVIA

O: 18MAR2023 06:50:07 19.8S 66.9W mb=4.7 ANSS N of Colchani Bolivia

P: 19MAR2023 151646 21.0S 69.0W 4.0-5.6 ABBAA Coast No. Chile

O: 18MAR2023 04:31:27 22.3N 108.6W mb=4.5 EMSC OFF COAST OF BAJA CALIFORNIA SUR

O: 18MAR2023 00:41:24 22.4N 108.1W ML=4.4 EMSC OFF COAST OF BAJA CALIFORNIA SUR

O: 18MAR2023 03:07:22 22.4N 108.4W ML=4.3 EMSC OFF COAST OF BAJA CALIFORNIA SUR

O: 18MAR2023 01:42:14 22.7N 108.4W ML=4.4 EMSC OFF COAST OF BAJA CALIFORNIA SUR

O: 18MAR2023 01:14:08 22.9N 108.0W ML=4.3 EMSC OFF COAST OF BAJA CALIFORNIA SUR

O: 18MAR2023 01:01:01 22.2N 108.7W mb=4.2 EMSC OFF COAST OF BAJA CALIFORNIA S

P: 13MAR2023 151463 24.0N 109.0W 3.5-5.4 BBAAA Gulf of California

P: 20MAR2023 151463 20.0N 109.0W 3.5-5.1 ACAAA Gulf of California

NEIC reported this earthquake of M 3.2 in Baja California, Mexico was felt with intensity II-III in the area(s) of Baja California, Mexico in Lazaro Cardenas.

AFRICA AND EUROPE

O: 18MAR2023 01:40:06 37.8N 36.7E ML=4.2 EMSC CENTRAL TURKEY

P: 17MAR2023 151537 38.0N 36.0E 3.5-5.2 AAAAA Turkey

O: 17MAR2023 13:45:42 37.9N 21.3E ML=4.1 EMSC SOUTHERN GREECE

P: 18MAR2023 151502 39.0N 20.0E 3.0-4.4 ABAAA No. Greece

O: 18MAR2023 05:14:31 38.0N 36.5E ML=4.5 EMSC CENTRAL TURKEY

P: 17MAR2023 151537 38.0N 36.0E 3.5-5.2 AAAAA Turkey

O: 18MAR2023 02:01:50 40.0N 39.5E ML=4.0 EMSC EASTERN TURKEY

P: 20MAR2023 151538 39.0N 41.0E 3.5-5.1 AAAAA Turkey

P: 19MAR2023 151548 40.0N 41.0E 3.5-5.1 AAAAA Caucasus/Caspian Sea

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

SOUTHWEST PACIFIC

O: 18MAR2023 03:01:10 19.2S 179.2W Mw=5.3 EMSC FIJI REGION

P: 19MAR2023 151638 18.0S 180.0W 4.0-5.4 ABAAA Tonga Islands

P: 20MAR2023 151639 19.0S 178.0W 4.0-5.4 AAAAA Tonga Islands

O: 18MAR2023 01:14:05 21.1S 168.8E mb=4.7 EMSC LOYALTY ISLANDS

P: 17MAR2023 151647 22.0S 170.0E 4.0-5.4 AAAAA Loyalty Islands

O: 18MAR2023 00:14:46 22.2S 177.2W mb=4.5 EMSC SOUTH OF FIJI ISLANDS

P: 16MAR2023 151653 25.0S 177.0W 4.0-5.5 ACAAA Tonga Islands

O: 17MAR2023 23:43:20 23.0S 167.8E mb=4.6 EMSC NEW CALEDONIA

P: 17MAR2023 151647 22.0S 170.0E 4.0-5.4 AABAA Loyalty Islands

O: 17MAR2023 20:32:00 23.5S 176.3W ML=4.6 EMSC SOUTH OF FIJI ISLANDS

P: 16MAR2023 151653 25.0S 177.0W 4.0-5.5 ABAAA Tonga Islands

OCEAN RIDGES

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

ZEALANDIA AND AUSTRALIA REGION

O: 18MAR2023 03:44:08 30.5S 176.6W mb=5.0 EMSC KERMADEC ISLANDS REGION

P: 16MAR2023 151659 30.0S 177.0W 4.0-5.4 AAAAA No. Kermadec Islands

O: 18MAR2023 00:42:03 43.8S 173.1E ML=4.3 EMSC OFF E. COAST OF S. ISLAND, N.Z.