MODERATE EARTHQUAKE SHAKES SICHUAN, CHINA
EARTHQUAKE SUMMARY FOR SEPTEMBER 15, 2021
The strongest earthquake felt in the world today was an M 5.4 in Sichuan, China. NEIC reported maximum intensity VII in Yngchang, Chongqing, China and VI in Zigogn, Sichuan. Intensity V was felt in Chongqing at Chongqing and Beibei and IV in Sichuan at Luzhou, Yilbin, Jiancheng, Chengdu, Dawan. An earthquake of M 5.8 occurred within about 100 km of this epicenter on June 17, 2019 following an M 6.6 on April 20, 2013 and an M 5.8 on May 13, 2008, the only events of larger magnitude within about 250 km of today's epicenter in at least 30 years. Forecast 137044 had expected today's event to the southwest of this epicenter was likely around September 15. Forecast 135608 had expected enhanced activity in this region within about 200 km of this epicenter was likely in late August or early September
O: 15SEP2021 20:33:32 29.2N 105.4E Mw=5.4 EMSC SICHUAN-CHONGQING BDR REG, CHI
P: 25AUG2021 136508 27.0N 97.0E 4.0-5.6 ACCAA Myanmar
P: 15SEP2021 137044 28.0N 104.0E 4.0-5.4 DBAAA Myanmar
An M 5.4 also occurred today in the South Georgia Island area west of the South Sandwich Islands where events of M 5.0 and 5.2 continued the month-long aftershocks sequence following the M 8.1 in that region on August 12, 2021. None of this activity was reported felt in these remote areas. The M 5.4 in the South Georgia Island area within about 300 km of today's epicenter was the strongest in that area since an M 5.6 on November 15, 2002. Larger earthquakes about 500 km southeast of this epicenter occurred in May, 2017 and in September, 2003 and in July through September, 2006. An M 5.0 occurred in this area about 400 km northeast of today's event on May 15, 2021 and an M 4.9 occurred about 150 km northeast of this on August 12, 2021. Forecast 137235 had expected enhanced seismicity south of this was likely around September 16.
O: 16SEP2021 01:20:39 56.4S 36.2W mb=5.4 EMSC SOUTH GEORGIA ISLAND REGION
P: 16SEP2021 137235 61.0S 34.0W 4.0-5.6 ACAAA Southern Ocean
O: 16SEP2021 04:58:37 59.6S 26.0W mb=5.0 EMSC SOUTH SANDWICH ISLANDS REGION
O: 15SEP2021 10:22:57 58.0S 23.4W mb=5.2 EMSC SOUTH SANDWICH ISLANDS REGION
P: 12SEP2021 137234 58.0S 25.0W 4.0-5.8 BAAAA So. Sandwich Islands
P: 14SEP2021 137235 61.0S 22.0W 4.0-5.6 ACAAA Southern Ocean
The strongest earthquake in the U.S. or Canada today was an M 5.0 in the central Andreanof Islands. This epicenter saw the last such event of M>=5 within about 150 km on September 9, 2017 when an M 5.4 occurred about 75 km west of today's epicenter. Most moderate earthquakes in the area occur at least 100 km north of today's epicenter. Forecast 137156 had expected today's event was likely in this area around September 15.
O: 15SEP2021 13:27:53 50.4N 176.3W mb=5.0 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
P: 15SEP2021 137156 51.3N 176.8W 3.5-5.1 AAAAA Andreanoff Isls, Aleutians
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 15SEP2021 10:50:53 23.2N 121.4E ML=4.5 EMSC TAIWAN
O: 15SEP2021 10:50:53 23.2N 121.3E ML=4.5 TAI Hualien, Taiwan
P: 12SEP2021 137049 23.0N 123.0E 4.0-5.9 BAAAA Taiwan
P: 15SEP2021 137049 24.0N 123.0E 4.0-5.5 AABAA Taiwan
P: 17SEP2021 137050 22.0N 122.0E 4.0-5.5 ABAAA Taiwan
CWB reported this earthquake was felt with intensity III in Taitung; II in Hualien, and I in Nantou, Kaohsiung, Yunlin, Chiayi and Tainan Counties, Taiwan.
O: 15SEP2021 13:29:42 23.4N 93.2E mb=4.4 EMSC MYANMAR-INDIA BORDER REGION
O: 16SEP2021 04:49:46 23.9N 94.2E ML=4.3 EMSC MYANMAR
P: 13SEP2021 137043 23.0N 95.0E 4.0-5.5 BAAAA Myanmar
O: 15SEP2021 20:33:32 29.2N 105.4E Mw=5.4 EMSC SICHUAN-CHONGQING BDR REG, CHI
P: 15SEP2021 137044 27.0N 97.0E 4.0-5.6 ACCAA Myanmar
O: 16SEP2021 06:31:11 42.3N 76.5E mb=4.0 EMSC KYRGYZSTAN
P: 15SEP2021 137123 41.0N 77.0E 4.0-5.6 ABAAA Kirgizstan/Xinjiang
O: 15SEP2021 17:00:35 53.8N 161.2E mb=4.2 EMSC OFF EAST COAST OF KAMCHATKA
P: 14SEP2021 137159 53.0N 160.0E 4.0-5.6 AAAAA E. of Kamchatka
INDONESIA AND PHILIPPINES
O: 15SEP2021 16:30:49 0.4N 124.0E ML=4.0 EMSC MINAHASA, SULAWESI, INDONESIA
P: 20SEP2021 136967 1.0N 123.0E 4.0-5.6 BAAAA Celebes Sea
O: 16SEP2021 00:08:34 6.3S 130.4E ML=4.0 EMSC BANDA SEA
P: 17SEP2021 136979 6.0S 129.0E 4.0-5.6 AABAA Banda Sea
P: 19SEP2021 136999 7.0S 130.0E 4.0-5.4 BAAAA West Irian, PNG
O: 15SEP2021 19:00:43 8.3S 117.2E ML=4.4 EMSC SUMBAWA REGION, INDONESIA
P: 18SEP2021 137198 11.0S 118.0E 4.0-5.4 BCAAA So. of Indonesia
O: 15SEP2021 22:18:33 8.4N 98.0E ML=3.5 EMSC MALAY PENINSULA, THAILAND
P: 13SEP2021 136977 8.0N 93.0E 4.0-5.4 AACAA Nicobar Islands
O: 16SEP2021 05:39:33 9.2S 123.2E mb=4.4 EMSC TIMOR REGION, INDONESIA
P: 20SEP2021 137192 10.0S 124.0E 4.0-5.4 BAAAA Flores Island area
NEIC reported this earthquake of M 4.4 in Timor, Indonesia was felt with intensity II-III in the area(s) of Timor, Indonesia at Kupang Nusa, Tenggara.
O: 15SEP2021 10:48:06 11.3N 125.3E mb=4.3 EMSC SAMAR, PHILIPPINES
P: 13SEP2021 137013 12.0N 124.0E 3.5-4.9 AAAAA Luzon, Philippines
NEIC reported this earthquake of M 4.3 in Samar, Philippines was felt with intensity II-III in the area(s) of Samar, Philippines at San Antonio, Tabontabon and Mariveles, Luzon,
CENTRAL AND SOUTH AMERICA
O: 15SEP2021 11:58:23 13.8N 93.4W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO
P: 15SEP2021 137004 14.0N 94.0W 3.5-5.2 AAAAA Chiapas, Mexico
O: 15SEP2021 22:31:42 15.6N 92.9W mb=4.9 EMSC CHIAPAS, MEXICO
P: 12SEP2021 137009 16.0N 92.0W 3.5-5.3 BAAAA Guatemala
NEIC reported this earthquake of M 4.9 in Chiapas, Mexico was felt with intensity II-III in the area(s) of Chiapas, Mexico at Tuxtla Gutierrez.
O: 15SEP2021 14:10:46 17.0N 99.8W ML=4.0 EMSC GUERRERO, MEXICO
P: 14SEP2021 137026 17.0N 100.0W 3.5-5.4 AAAAA Oaxaca, Mexico
O: 15SEP2021 07:24:18 18.3N 65.0W Md=3.4 EMSC VIRGIN ISLANDS REGION
P: 16SEP2021 137012 19.0N 64.0W 3.0-5.3 AAAAA Leeward Islands
NEIC reported this earthquake of M 3.4 in the Virgin Islands was felt with intensity II-III in the area(s) of the Virgin Islands at Saint Thomas and Saint John.
O: 15SEP2021 08:04:57 18.6N 74.2W ML=3.4 EMSC HAITI REGION
O: 15SEP2021 07:40:12 18.3N 73.7W ML=3.4 EMSC HAITI REGION
P: 16SEP2021 137029 19.0N 74.0W 3.4-5.2 AAAAA Haiti
O: 15SEP2021 14:02:57 18.5N 69.0W Md=4.0 EMSC DOMINICAN REPUBLIC
P: 16SEP2021 137028 19.0N 68.0W 3.4-5.1 AAAAA Puerto Rico
NEIC reported this earthquake of M 4.0 in the Dominican Republic was felt with intensity II-III in the area(s) of the Dominican Republic at Guaymate.
O: 16SEP2021 02:13:06 20.1S 68.9W mb=4.4 EMSC TARAPACA, CHILE
P: 14SEP2021 137206 21.0S 69.0W 4.0-5.8 AAAAA Coast No. Chile
O: 15SEP2021 15:47:36 22.3S 68.6W mb=4.3 EMSC ANTOFAGASTA, CHILE
P: 15SEP2021 137206 24.0S 69.0W 4.0-5.6 ABAAA Coast No. Chile
O: 15SEP2021 08:32:40 23.6N 108.5W ML=4.2 EMSC GULF OF CALIFORNIA
P: 20SEP2021 137037 20.0N 109.0W 3.5-4.9 BACAA Gulf of California
O: 16SEP2021 00:18:43 24.0S 66.8W mb=4.5 EMSC JUJUY, ARGENTINA
P: 14SEP2021 137204 23.0S 66.0W 4.0-5.5 AAAAA Argentina
O: 15SEP2021 18:48:34 24.1S 67.3W ML=4.1 EMSC SALTA, ARGENTINA
P: 15SEP2021 137206 24.0S 69.0W 4.0-5.6 AABAA Coast No. Chile
O: 16SEP2021 01:10:18 26.3S 71.0W mb=4.5 EMSC OFFSHORE ATACAMA, CHILE
P: 15SEP2021 137206 24.0S 69.0W 4.0-5.6 ACBAA Coast No. Chile
O: 16SEP2021 06:10:33 32.1S 72.4W mb=4.5 EMSC OFFSHORE COQUIMBO, CHILE
O: 15SEP2021 08:46:58 32.1S 72.3W mb=5.0 EMSC OFFSHORE COQUIMBO, CHILE
P: 16SEP2021 137219 32.0S 72.0W 4.0-5.8 AAAAA Central Chile
NEIC reported this earthquake of M 5.0 in Valparaiso, Chile was felt with intensity II-III in the area(s) of Valparaiso, Chile with IV at La Ligua, Vina del Mar, Calera, Quilpue and II in Valparaiso and Santiago.
NEIC reported this earthquake of M 4.5 in Central Chile was felt with intensity II-III in the area(s) of Central Chile at Santiago.
AFRICA AND EUROPE
O: 15SEP2021 12:36:56 65.3N 16.1W ML=3.6 EMSC ICELAND
P: 6SEP2021 136915 66.0N 17.0W 3.0-4.6 CAAAA Iceland area
O: 15SEP2021 12:29:07 28.6N 17.9W ML=3.3 EMSC CANARY ISLANDS, SPAIN REGION
O: 15SEP2021 09:25:20 28.6N 17.9W ML=3.2 EMSC CANARY ISLANDS, SPAIN REGION
P: 15SEP2021 137036 28.0N 17.0W 3.0-4.5 AAAAA Canary Islands
O: 15SEP2021 12:26:53 42.3N 19.5E ML=4.2 EMSC ALBANIA
P: 8SEP2021 136852 43.0N 18.0E 3.0-5.3 CAAAA Adriatic Sea
NEIC reported this earthquake of M 4.2 in Albania was felt with intensity II-III in the area(s) of Albania with V in Kopik, VI in Shkoder, Podgorica, and Kosovo, Serbia and Montenegro, and in Albania at Durres, Tirana.
SOUTHWEST PACIFIC
O: 15SEP2021 09:53:42 24.1S 179.4E mb=4.1 EMSC SOUTH OF FIJI ISLANDS
P: 17SEP2021 137216 25.0S 179.0E 4.0-5.4 AAAAA Tonga/Fiji
No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.
OCEAN RIDGES
O: 15SEP2021 09:36:45 1.4S 15.9W mb=5.2 EMSC NORTH OF ASCENSION ISLAND
P: 20SEP2021 136981 1.0S 20.0W 4.0-5.8 BACAA Central Mid-Atlantic
O: 16SEP2021 01:20:39 56.4S 36.2W mb=5.4 EMSC SOUTH GEORGIA ISLAND REGION
P: 16SEP2021 137235 61.0S 34.0W 4.0-5.6 ACAAA Southern Ocean
O: 16SEP2021 04:58:37 59.6S 26.0W mb=5.0 EMSC SOUTH SANDWICH ISLANDS REGION
O: 15SEP2021 10:22:57 58.0S 23.4W mb=5.2 EMSC SOUTH SANDWICH ISLANDS REGION
P: 12SEP2021 137234 58.0S 25.0W 4.0-5.8 BAAAA So. Sandwich Islands
P: 14SEP2021 137235 61.0S 22.0W 4.0-5.6 ACAAA Southern Ocean
O: 15SEP2021 08:08:31 59.7S 26.3W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
P: 16SEP2021 137234 58.0S 26.0W 4.0-5.8 ABAAA So. Sandwich Islands
ZEALANDIA AND AUSTRALIA REGION
O: 15SEP2021 12:44:12 28.2S 177.6W mb=5.1 EMSC KERMADEC ISLANDS REGION
O: 15SEP2021 20:14:52 28.4S 177.4W mb=4.8 EMSC KERMADEC ISLANDS REGION
O: 16SEP2021 00:06:09 28.1S 177.5W mb=4.9 EMSC KERMADEC ISLANDS REGION
P: 18SEP2021 137208 29.0S 178.0W 4.0-5.6 AAAAA No. Kermadec Islands
JAPAN AND KURIL ISLANDS
O: 16SEP2021 06:56:48 44.4N 149.2E mb=4.0 EMSC KURIL ISLANDS
P: 17SEP2021 137120 44.0N 148.0E 3.5-5.6 AAAAA Hokkaido, Japan
P: 19SEP2021 137120 44.0N 150.0E 3.5-5.4 BAAAA Hokkaido, Japan
O: 16SEP2021 06:28:04 52.7N 152.7E mb=4.5 EMSC NORTHWEST OF KURIL ISLANDS
P: 19SEP2021 137147 47.0N 151.0E 3.5-5.6 BCBAA So. Kurils
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 15SEP2021 08:37:33 31.1N 114.4W ML=3.6 EMSC GULF OF CALIFORNIA
P: 14SEP2021 137038 30.0N 114.0W 3.5-4.9 ABAAA Gulf of California
O: 16SEP2021 05:46:34 31.3N 115.2W ML=3.3 EMSC BAJA CALIFORNIA, MEXICO
O: 15SEP2021 08:24:04 31.3N 115.3W ML=3.2 EMSC BAJA CALIFORNIA, MEXICO
P: 12SEP2021 137092 31.9N 116.3W 2.5-4.8 BAAAA So. California
O: 15SEP2021 10:01:32 34.4N 118.0W Ml=2.3 EMSC SOUTHERN CALIFORNIA
P: 17SEP2021 137095 34.0N 118.7W 2.5-4.6 AAAAA So. California
O: 15SEP2021 18:50:02 34.7N 116.4W Ml=2.1 EMSC SOUTHERN CALIFORNIA
P: 16SEP2021 137098 34.6N 116.7W 2.5-4.8 AAAAA So. California
O: 16SEP2021 02:45:42 36.0N 120.6W Md=2.8 EMSC CENTRAL CALIFORNIA
O: 15SEP2021 12:51:06 35.9N 120.4W Md=2.3 EMSC CENTRAL CALIFORNIA
P: 14SEP2021 137064 36.1N 120.1W 2.5-4.8 AAAAA Central California
P: 14SEP2021 137065 36.4N 121.0W 2.5-4.6 AAAAA Central California
NEIC reported this earthquake of M 2.8 in Central California was felt with intensity II-III in the area(s) of Central California at Los Banos and Aromas.
O: 15SEP2021 12:56:17 36.1N 117.9W Ml=2.2 EMSC CENTRAL CALIFORNIA
P: 16SEP2021 137056 36.3N 118.1W 2.5-4.6 AAAAA California/Nevada area
O: 16SEP2021 03:23:42 37.4N 118.6W Md=2.9 EMSC CENTRAL CALIFORNIA
P: 17SEP2021 137058 37.3N 118.3W 2.5-4.6 AAAAA California/Nevada area
O: 15SEP2021 22:50:27 37.4N 121.0W Md=2.2 EMSC CENTRAL CALIFORNIA
P: 19SEP2021 137066 37.1N 121.5W 2.5-4.6 BAAAA Central California
O: 16SEP2021 02:08:47 37.5N 121.9W Md=2.3 EMSC SAN FRANCISCO BAY AREA, CALIF.
P: 15SEP2021 137066 37.9N 122.0W 2.5-4.6 AAAAA Central California
O: 16SEP2021 06:51:56 38.4N 119.6W Md=2.1 EMSC CENTRAL CALIFORNIA
O: 15SEP2021 16:08:56 38.5N 119.5W Md=2.2 EMSC CENTRAL CALIFORNIA
O: 15SEP2021 16:17:12 38.5N 119.5W Md=2.2 EMSC CENTRAL CALIFORNIA
O: 15SEP2021 12:29:44 38.4N 119.6W ML=3.3 EMSC CENTRAL CALIFORNIA
O: 15SEP2021 12:29:44 38.4N 119.6W ML=3.6 ANSS CENTRAL CALIFORNIA
P: 17SEP2021 137062 38.3N 119.3W 2.5-4.6 AAAAA California/Nevada area
NEIC reported this earthquake of M 3.6 in Nevada was felt with intensity II-III in the area(s) of Nevada at Gardnerville, Glenbrook, and in California at Coleville, South Lake Tahoe, Sonora, Volcano, Camino, Racho Cordova, Nevada City and Gustine.
ALASKA
O: 15SEP2021 13:27:53 50.4N 176.3W mb=5.0 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
P: 15SEP2021 137156 51.3N 176.8W 3.5-5.1 AAAAA Andreanoff Isls, Aleutians
O: 15SEP2021 10:48:54 55.1N 156.3W mb=4.5 EMSC SOUTH OF ALASKA
P: 19SEP2021 137153 54.7N 156.9W 3.5-5.2 BAAAA Alaska Peninsula
O: 15SEP2021 11:21:13 58.5N 137.2W MB=3.0 ECAN Skagway, AK
P: 11SEP2021 137170 59.0N 139.0W 3.0-4.5 BAAAA Southeast Alaska
O: 15SEP2021 02:10:53 60.0N 140.1W MB=3.0 ECAN Yakutat, AK
O: 15SEP2021 01:43:06 60.0N 140.1W MB=3.7 ECAN Yakutat, AK
P: 15SEP2021 137170 60.0N 140.0W 3.0-4.5 AAAAA Southeast Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 16SEP2021 13:41:23 48.7N 129.3W MB=3.0 ECAN Port Alice, BC
P: 17SEP2021 137150 48.3N 128.5W 2.8-5.4 AAAAA Vancouver Island area
ROCKY MOUNTAINS REGION
O: 15SEP2021 18:44:49 31.6N 104.2W ML=2.2 EMSC WESTERN TEXAS
P: 14SEP2021 137091 31.6N 103.6W 2.0-4.0 AAAAA SW U.S.A
O: 15SEP2021 22:55:53 43.2N 110.8W Ml=2.0 EMSC WYOMING
P: 17SEP2021 137152 43.0N 111.5W 2.0-4.1 AAAAA Yellowstone/Wyoming
O: 15SEP2021 09:16:54 44.4N 114.8W Ml=2.3 EMSC SOUTHERN IDAHO
P: 13SEP2021 137126 44.4N 115.1W 2.0-4.0 AAAAA Montana/Idaho
EASTERN U.S./CANADA
O: 15SEP2021 21:52:00 35.1N 95.4W ML=2.1 EMSC OKLAHOMA
P: 16SEP2021 137106 35.0N 97.0W 2.0-4.4 AAAAA Southern Plains
O: 15SEP2021 18:59:14 36.3N 97.5W ML=2.3 EMSC OKLAHOMA
P: 15SEP2021 137105 36.0N 97.0W 2.0-4.1 AAAAA Southern Plains
HAWAII
O: 16SEP2021 00:43:36 19.2N 155.5W ML=3.1 EMSC ISLAND OF HAWAII, HAWAII
O: 15SEP2021 17:36:53 19.2N 155.5W Ml=3.2 EMSC ISLAND OF HAWAII, HAWAII
P: 17SEP2021 137010 19.4N 155.3W 3.0-4.8 AAAAA Hawaii
NEIC reported this earthquake of M 3.2 in Hawaii was felt with intensity II-III in the area(s) of Hawaii at Pahala, Captain Cook, Volcano, Pepeekeo, Waikoloa.
MODERATE SYMMETRIC QUAKES IN ATLANTIC
EARTHQUAKE SUMMARY FOR SEPTEMBER 14, 2021
The largest earthquakes in the world today were an M 5.3 and 5.2 in the South Sandwich Islands, continuing the month-long aftershock sequence in that region. These events at 59 South latitude were joined today by an M 4.6 at 59 North Latitude in the Reykjanes Ridge directly to the north of the South Sandwich Islands. These events occurred near local solar midnight and may have been promoted by high tidal stresses which maximize near this hour. The event in the Reykjanes Ridge had been expected within about 100 km to occur in mid-September in forecasts 136901 and 137165. The activity in the South Sandwich Islands had been forecast in # 137234 and 137235 within about 50 km of these events.
O: 15SEP2021 03:31:35 58.4S 25.6W Mw=5.3 EMSC SOUTH SANDWICH ISLANDS REGION
P: 12SEP2021 137234 58.0S 25.0W 4.0-5.8 BAAAA So. Sandwich Islands
O: 15SEP2021 04:43:04 58.9S 23.8W mb=5.2 EMSC SOUTH SANDWICH ISLANDS REGION
P: 12SEP2021 137234 58.0S 25.0W 4.0-5.8 BAAAA So. Sandwich Islands
P: 14SEP2021 137235 61.0S 22.0W 4.0-5.6 ABAAA Southern Ocean
O: 15SEP2021 03:47:05 58.7N 31.9W mb=4.6 EMSC REYKJANES RIDGE
P: 7SEP2021 136901 58.0N 32.0W 4.0-5.8 CAAAA North Mid-Atlantic Ridge
P: 13SEP2021 137165 59.0N 30.0W 4.0-5.4 AAAAA North Mid-Atlantic Ridge
Moderate earthquakes of M 5.2 and 5.3 also occurred today in Indonesia in Minahasa, Sulawesi and in northern Sumatra and in Tonga. These are not unusual events and had been expected within about 100 km in forecasts 136975, 136976 and 137194.
O: 15SEP2021 00:49:49 1.2N 122.2E Mw=5.2 EMSC MINAHASA, SULAWESI, INDONESIA
P: 14SEP2021 136975 1.0N 123.0E 4.0-5.4 AAAAA Mindanao, Philippines
O: 14SEP2021 20:13:54 3.0N 95.4E Mw=5.3 EMSC OFF W COAST OF NORTHERN SUMATR
P: 15SEP2021 136976 2.0N 95.0E 4.0-5.4 AAAAA Nicobar Islands
NEIC reported the earthquake of M 5.2 in Tonga was felt with intensity II-III in the area(s) of Tonga at Pangai Ha'apai. Forecast 137194 had expected this event within about 100 km of this epicenter was likely around September 18.
O: 14SEP2021 10:28:18 15.1S 174.0W Mw=5.2 EMSC TONGA
P: 18SEP2021 137194 15.0S 173.0W 4.0-5.6 BAAAA Samoa Islands
A series of light earthquakes including events of M 3.4 and 3.4 occurred in Baja California, Mexico today. These occurred near local solar midnight and local solar noon and may have been promoted by high tidal stresses which maximize near these hours. Forecast 137092 had expected this activity was likely around September 12 to the northwest of these epicenters.
O: 14SEP2021 18:53:31 31.4N 115.5W ML=3.4 EMSC BAJA CALIFORNIA, MEXICO
O: 14SEP2021 18:58:58 31.4N 115.4W ML=3.1 EMSC BAJA CALIFORNIA, MEXICO
O: 14SEP2021 19:01:19 31.4N 115.5W ML=3.2 EMSC BAJA CALIFORNIA, MEXICO
O: 14SEP2021 17:46:23 31.5N 115.6W Ml=2.6 EMSC BAJA CALIFORNIA, MEXICO
O: 15SEP2021 06:57:03 31.3N 115.4W ML=3.4 EMSC BAJA CALIFORNIA, MEXICO
P: 12SEP2021 137092 31.9N 116.3W 2.5-4.8 BAAAA So. California
The strongest earthquake in the U.S. or Canada today was an M 3.8 in the Parkfield, California area. NEIC reported this earthquake of M 3.8 in Central California was felt with intensity II-III in the area(s) of Central California at Coalinga, King City, Bradley, Paso Robles, Los Banos, Fresno, Salinas and San Juan Bautista. This is the strongest earthquake within about 50 km of this epicenter since an M 3.9 more than a year ago on July 30, 2020. The only other event in the past six years in the area was an M 4.0 on March 3, 2020. Forecasts 137064 and 137065 had today's event within this area around September 14. This epicenter is at 103 degrees from the M 7.1 in Mindanao, Philippines of August 11 and may have been promoted by energy from that source.
O: 14SEP2021 07:38:50 36.4N 120.5W ML=3.8 EMSC CENTRAL CALIFORNIA
P: 14SEP2021 137064 36.1N 120.1W 2.5-4.8 AAAAA Central California
P: 14SEP2021 137065 36.4N 121.0W 2.5-4.6 AAAAA Central California
The swarm of earthquakes in the Canary Islands of Spain continued today. Only four events of M>=2.9 occurred in the area today but lesser events were common as well. This appears to be a significant decline in regional activity following the M 3.9 yesterday. This could be precursory to a change - to quiet or to active - conditions in the next several days. Forecast 137036 had expected this event was likely around September 15. This activity is at the fourth node (90 degrees) from the M 8.1 in the Alaska Peninsula of March, 2021 and the seventh node (51.4 degrees) from the M 7.2 in Haiti of August 14, 2021 and may have been promoted by energy from those sources.
O: 14SEP2021 22:00:56 28.6N 17.9W ML=2.9 EMSC CANARY ISLANDS, SPAIN REGION
O: 15SEP2021 05:15:23 28.6N 17.9W ML=3.1 EMSC CANARY ISLANDS, SPAIN REGION
O: 15SEP2021 06:07:41 28.6N 17.9W ML=2.9 EMSC CANARY ISLANDS, SPAIN REGION
O: 14SEP2021 21:11:08 28.6N 17.9W ML=3.0 EMSC CANARY ISLANDS, SPAIN REGION
P: 15SEP2021 137036 28.0N 17.0W 3.0-4.5 AAAAA Canary Islands
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: 15SEP2021 00:41:13 36.3N 70.6E mb=4.3 EMSC HINDU KUSH REGION, AFGHANISTAN
P: 14SEP2021 137073 36.0N 69.0E 3.8-5.5 AAAAA Hindu Kush/Pakistan
O: 14SEP2021 17:52:24 41.3N 81.0E mb=4.2 EMSC SOUTHERN XINJIANG, CHINA
P: 16SEP2021 137123 43.0N 82.0E 4.0-5.6 ABAAA Kirgizstan/Xinjiang
O: 14SEP2021 10:40:05 33.3N 72.2E mb=4.7 EMSC PAKISTAN
P: 18SEP2021 137086 36.0N 75.0E 3.8-5.2 BCBAA Northern India
NEIC reported this earthquake of M 4.7 in Pakistan was felt with intensity II-III in the area(s) of Pakistan at Pindi Gheb (VI), Pawalpindi, Pumjab and in Islamabad.
O: 14SEP2021 19:57:31 53.9N 161.2E mb=4.9 EMSC OFF EAST COAST OF KAMCHATKA
P: 14SEP2021 137159 53.0N 160.0E 4.0-5.6 AAAAA E. of Kamchatka
O: 15SEP2021 04:51:05 54.3N 162.9E mb=4.3 EMSC NEAR EAST COAST OF KAMCHATKA
P: 14SEP2021 137161 56.0N 165.0E 4.0-6.0 ABBAA Komandorsky Isl
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 14SEP2021 11:26:39 0.6S 139.0E ML=4.0 EMSC PAPUA REGION, INDONESIA
P: 18SEP2021 136998 2.0S 139.0E 4.0-5.4 BBAAA West Irian, PNG
O: 14SEP2021 21:03:35 1.1N 128.1E ML=4.0 EMSC HALMAHERA, INDONESIA
P: 12SEP2021 136974 2.0N 128.0E 4.0-5.4 AAAAA Halmahera
O: 15SEP2021 00:49:49 1.2N 122.2E Mw=5.2 EMSC MINAHASA, SULAWESI, INDONESIA
P: 14SEP2021 136975 1.0N 123.0E 4.0-5.4 AAAAA Mindanao, Philippines
O: 14SEP2021 20:13:54 3.0N 95.4E Mw=5.3 EMSC OFF W COAST OF NORTHERN SUMATR
P: 15SEP2021 136976 2.0N 95.0E 4.0-5.4 AAAAA Nicobar Islands
O: 15SEP2021 04:42:03 3.5N 126.9E ML=4.5 EMSC KEPULAUAN TALAUD, INDONESIA
P: 20SEP2021 136974 3.0N 127.0E 4.0-5.4 BAAAA Halmahera
O: 14SEP2021 15:35:02 6.6S 130.7E ML=4.2 EMSC BANDA SEA
P: 17SEP2021 136979 6.0S 129.0E 4.0-5.6 BABAA Banda Sea
O: 14SEP2021 09:14:34 7.1S 105.5E ML=4.1 EMSC JAVA, INDONESIA
P: 19SEP2021 136993 7.0S 106.0E 4.0-5.4 BAAAA So. of Java
O: 14SEP2021 09:08:43 8.1S 107.9E ML=4.4 EMSC JAVA, INDONESIA
P: 13SEP2021 136993 9.0S 107.0E 4.0-5.6 AAAAA So. of Java
O: 14SEP2021 18:47:12 10.4N 93.2E mb=4.4 EMSC ANDAMAN ISLANDS, INDIA REGION
P: 13SEP2021 137000 11.0N 95.0E 4.0-5.5 AABAA Andaman Islands
CENTRAL AND SOUTH AMERICA
O: 15SEP2021 00:47:07 11.1N 86.1W ML=4.1 EMSC NEAR COAST OF NICARAGUA
P: 11SEP2021 137021 11.0N 86.0W 3.5-5.5 BAAAA Nicaragua
O: 14SEP2021 16:38:58 15.3N 94.4W ML=4.2 EMSC OFFSHORE CHIAPAS, MEXICO
P: 15SEP2021 137004 14.0N 94.0W 3.5-5.2 ABAAA Chiapas, Mexico
O: 15SEP2021 01:36:53 18.0N 67.0W Md=3.5 EMSC PUERTO RICO
P: 17SEP2021 137027 19.0N 67.0W 3.4-5.3 AAAAA Puerto Rico
NEIC reported this earthquake of M 3.5 in Puerto Rico was felt with intensity II-III in the area(s) of Puerto Rico at Guanica, Sabana Grande, Yauco and Cabo Rojo.
O: 15SEP2021 05:07:26 18.9N 74.0W ML=3.4 EMSC HAITI REGION
O: 15SEP2021 06:59:10 18.9N 74.0W ML=3.3 EMSC HAITI REGION
O: 15SEP2021 04:26:52 18.8N 74.1W ML=3.5 EMSC HAITI REGION
P: 16SEP2021 137029 19.0N 74.0W 3.4-5.2 AAAAA Haiti
O: 14SEP2021 19:45:25 19.0N 69.4W ML=3.1 EMSC DOMINICAN REPUBLIC
P: 19SEP2021 137034 20.0N 69.0W 3.0-4.4 BAAAA Bahamas/No. Caribbean
O: 14SEP2021 09:49:04 19.1N 66.1W Md=3.2 EMSC PUERTO RICO REGION
P: 12SEP2021 137027 18.0N 66.0W 3.4-5.4 ABAAA Puerto Rico
O: 15SEP2021 04:07:54 31.8S 72.0W mb=4.1 EMSC OFFSHORE COQUIMBO, CHILE
O: 15SEP2021 02:09:42 31.8S 72.0W Mw=4.1 EMSC OFFSHORE COQUIMBO, CHILE
P: 16SEP2021 137219 32.0S 72.0W 4.0-5.8 AAAAA Central Chile
AFRICA AND EUROPE
O: 15SEP2021 06:52:33 35.5N 3.6W ML=3.4 EMSC STRAIT OF GIBRALTAR
P: 14SEP2021 137078 35.0N 4.0W 3.5-5.2 AAAAA Morocco/Spain
O: 14SEP2021 10:40:40 37.7N 20.3E mb=4.5 EMSC IONIAN SEA
P: 16SEP2021 137082 37.0N 21.0E 3.0-4.7 AAAAA No. Greece
O: 15SEP2021 02:19:43 42.3N 19.5E mb=4.1 EMSC ALBANIA
P: 8SEP2021 136852 43.0N 18.0E 3.0-5.3 CAAAA Adriatic Sea
P: 17SEP2021 137142 40.0N 20.0E 3.0-5.1 ACAAA Romania/NW Turkey
NEIC reported this earthquake of M 4.1 in Albania was felt with intensity II-III in the area(s) of Albania at Shkoder, Podgorica, Serbia and Montenegro, and Cilipi Dubrovnik, Croatia.
O: 14SEP2021 22:00:56 28.6N 17.9W ML=2.9 EMSC CANARY ISLANDS, SPAIN REGION
O: 15SEP2021 05:15:23 28.6N 17.9W ML=3.1 EMSC CANARY ISLANDS, SPAIN REGION
O: 15SEP2021 06:07:41 28.6N 17.9W ML=2.9 EMSC CANARY ISLANDS, SPAIN REGION
O: 14SEP2021 21:11:08 28.6N 17.9W ML=3.0 EMSC CANARY ISLANDS, SPAIN REGION
P: 15SEP2021 137036 28.0N 17.0W 3.0-4.5 AAAAA Canary Islands
SOUTHWEST PACIFIC
O: 14SEP2021 23:44:23 10.5S 165.9E Mw=5.1 EMSC SANTA CRUZ ISLANDS
P: 16SEP2021 137193 10.0S 162.0E 4.0-5.4 AACAA No. of Santa Cruz Islands
O: 14SEP2021 10:28:18 15.1S 174.0W Mw=5.2 EMSC TONGA
P: 18SEP2021 137194 15.0S 173.0W 4.0-5.6 BAAAA Samoa Islands
O: 14SEP2021 07:53:29 22.3S 179.3W mb=4.2 EMSC SOUTH OF FIJI ISLANDS
P: 13SEP2021 137215 23.0S 177.0W 4.0-5.6 AABAA Tonga Islands
OCEAN RIDGES
O: 15SEP2021 03:31:35 58.4S 25.6W Mw=5.3 EMSC SOUTH SANDWICH ISLANDS REGION
P: 12SEP2021 137234 58.0S 25.0W 4.0-5.8 BAAAA So. Sandwich Islands
O: 15SEP2021 04:43:04 58.9S 23.8W mb=5.2 EMSC SOUTH SANDWICH ISLANDS REGION
P: 12SEP2021 137234 58.0S 25.0W 4.0-5.8 BAAAA So. Sandwich Islands
P: 14SEP2021 137235 61.0S 22.0W 4.0-5.6 ABAAA Southern Ocean
O: 15SEP2021 03:47:05 58.7N 31.9W mb=4.6 EMSC REYKJANES RIDGE
P: 7SEP2021 136901 58.0N 32.0W 4.0-5.8 CAAAA North Mid-Atlantic Ridge
P: 13SEP2021 137165 59.0N 30.0W 4.0-5.4 AAAAA North Mid-Atlantic Ridge
ZEALANDIA AND AUSTRALIA REGION
O: 15SEP2021 06:34:32 34.8S 178.0E ML=4.1 EMSC NORTH OF NEW ZEALAND
O: 15SEP2021 00:24:04 34.5S 178.8E ML=4.1 EMSC SOUTH OF KERMADEC ISLANDS
P: 18SEP2021 137222 35.0S 179.0E 3.0-4.4 BAAAA North Island, N.Z.
O: 14SEP2021 09:50:19 40.0S 173.8E ML=4.2 EMSC COOK STRAIT, NEW ZEALAND
O: 14SEP2021 07:32:19 40.6S 173.3E ML=4.0 EMSC COOK STRAIT, NEW ZEALAND
P: 13SEP2021 137229 41.0S 174.0E 3.0-5.1 AAAAA So. Island, N.Z.
JAPAN AND KURIL ISLANDS
O: 15SEP2021 02:09:30 35.1N 140.6E ML=4.0 EMSC NEAR EAST COAST OF HONSHU, JAP
P: 14SEP2021 137088 36.0N 142.0E 4.0-5.4 AAAAA Off East Coast Honshu
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 14SEP2021 18:53:31 31.4N 115.5W ML=3.4 EMSC BAJA CALIFORNIA, MEXICO
O: 14SEP2021 18:58:58 31.4N 115.4W ML=3.1 EMSC BAJA CALIFORNIA, MEXICO
O: 14SEP2021 19:01:19 31.4N 115.5W ML=3.2 EMSC BAJA CALIFORNIA, MEXICO
O: 14SEP2021 17:46:23 31.5N 115.6W Ml=2.6 EMSC BAJA CALIFORNIA, MEXICO
O: 15SEP2021 06:57:03 31.3N 115.4W ML=3.4 EMSC BAJA CALIFORNIA, MEXICO
P: 12SEP2021 137092 31.9N 116.3W 2.5-4.8 BAAAA So. California
O: 14SEP2021 20:09:21 30.7N 114.1W ML=3.7 EMSC GULF OF CALIFORNIA
O: 14SEP2021 20:58:43 31.3N 114.4W ML=3.2 EMSC GULF OF CALIFORNIA
P: 14SEP2021 137038 30.0N 114.0W 3.5-4.9 AAAAA Gulf of California
O: 14SEP2021 14:12:58 32.5N 115.4W Ml=2.1 EMSC BAJA CALIFORNIA, MEXICO
P: 16SEP2021 137092 32.4N 115.8W 2.5-4.8 AAAAA So. California
O: 14SEP2021 13:35:27 34.0N 116.8W Ml=2.0 EMSC SOUTHERN CALIFORNIA
P: 16SEP2021 137098 34.6N 116.7W 2.5-4.8 AAAAA So. California
O: 14SEP2021 21:36:25 34.2N 117.5W ML=2.8 EMSC SOUTHERN CALIFORNIA
P: 13SEP2021 137097 34.1N 117.4W 2.5-4.4 AAAAA So. California
NEIC reported this earthquake of M 2.9 in eastern Los Angeles, California was felt with intensity II-III in the area(s) of eastern Los Angeles, California at Lytle Creek, Mt. Baldy, Rancho Cucamonga, Hesperia, San Bernardino, and Upland.
O: 15SEP2021 00:57:34 34.3N 118.4W ML=2.7 EMSC GREATER LOS ANGELES AREA, CALI
O: 15SEP2021 00:57:34 34.3N 118.4W ML=3.0 ANSS GREATER LOS ANGELES AREA, CALI
P: 17SEP2021 137095 34.0N 118.7W 2.5-4.6 AAAAA So. California
NEIC reported this earthquake of M 3.0 in eastern Los Angeles, California was felt with intensity II-III in the area(s) of western Los Angeles, California at San Fernando, Pacoima, Mission Hills, Newhall, Granada Hills, North Hills, Panorama, Sun Valley, Northridge.
O: 14SEP2021 23:20:49 35.0N 117.7W Ml=2.1 EMSC SOUTHERN CALIFORNIA
P: 13SEP2021 137099 35.0N 117.7W 2.5-4.4 AAAAA So. California
O: 14SEP2021 07:38:50 36.4N 120.5W ML=3.8 EMSC CENTRAL CALIFORNIA
P: 14SEP2021 137064 36.1N 120.1W 2.5-4.8 AAAAA Central California
P: 14SEP2021 137065 36.4N 121.0W 2.5-4.6 AAAAA Central California
NEIC reported this earthquake of M 3.8 in Central California was felt with intensity II-III in the area(s) of Central California at Coalinga, King City, Bradley, Paso Robles, Los Banos, Fresno, Salinas and San Juan Bautista.
O: 14SEP2021 19:58:53 36.5N 118.0W Ml=2.2 EMSC CENTRAL CALIFORNIA
P: 16SEP2021 137056 36.3N 118.1W 2.5-4.6 AAAAA California/Nevada area
O: 14SEP2021 18:45:27 37.5N 121.8W ML=2.7 EMSC SAN FRANCISCO BAY AREA, CALIF.
O: 14SEP2021 18:45:27 37.5N 121.8W ML=2.9 ANSS SAN FRANCISCO BAY AREA, CALIF.
P: 15SEP2021 137066 37.9N 122.0W 2.5-4.6 AAAAA Central California
NEIC reported this earthquake of M 2.9 in San Francisco Bay, California was felt with intensity II-III in the area(s) of San Francisco Bay, California in Milpitas, Fremnt, San Jose, Pleasanton.
O: 14SEP2021 20:05:04 37.9N 118.9W ml=2.2 EMSC CENTRAL CALIFORNIA
P: 10SEP2021 136800 38.2N 118.8W 2.5-4.4 BAAAA California/Nevada area
O: 15SEP2021 00:31:16 38.5N 119.5W ml=2.2 EMSC CENTRAL CALIFORNIA
O: 14SEP2021 23:42:05 38.5N 119.4W Md=2.3 EMSC CENTRAL CALIFORNIA
P: 17SEP2021 137062 38.3N 119.3W 2.5-4.6 BAAAA California/Nevada area
O: 14SEP2021 21:44:51 40.5N 119.6W ml=2.1 EMSC NEVADA
P: 15SEP2021 137115 40.5N 119.5W 2.5-4.8 AAAAA California/Nevada area
ALASKA
O: 14SEP2021 20:19:46 56.2N 149.6W ML=3.1 EMSC GULF OF ALASKA
P: 15SEP2021 137184 55.9N 149.8W 3.0-4.6 AAAAA Northern Alaska
O: 14SEP2021 21:54:38 60.4N 153.3W ML=3.0 EMSC SOUTHERN ALASKA
P: 16SEP2021 137175 60.0N 153.5W 3.2-5.3 AAAAA Central Alaska
O: 14SEP2021 21:51:19 62.2N 145.7W ML=3.7 EMSC CENTRAL ALASKA
P: 8SEP2021 136913 62.8N 143.8W 3.2-5.1 CAAAA Central Alaska
NEIC reported this earthquake of M 3.6 in Central Alaska was felt with intensity II-III in the area(s) of Central Alaska at Glennallen and Palmer.
O: 15SEP2021 02:33:21 64.4N 146.7W ML=3.0 EMSC CENTRAL ALASKA
P: 19SEP2021 137181 63.0N 148.6W 3.2-5.3 BBAAA Central Alaska
O: 14SEP2021 07:39:19 69.5N 143.7W ML=3.2 EMSC NORTHERN ALASKA
P: 14SEP2021 137183 69.9N 144.8W 3.0-4.6 AAAAA Northern Alaska
NEIC reported this earthquake of M 3.2 in Northern Alaska was felt with intensity II-III in the area(s) of Northern Alaska at Kaktovik.
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 15SEP2021 01:43:06 60.1N 140.2W ML=3.4 EMSC SOUTHERN YUKON TERRITORY, CANA
P: 15SEP2021 137170 60.0N 140.0W 3.0-4.5 AAAAA Southeast Alaska
ROCKY MOUNTAINS REGION
O: 15SEP2021 05:09:19 39.4N 110.3W ML=2.0 EMSC UTAH
O: 14SEP2021 18:03:27 39.4N 110.3W ML=2.3 EMSC UTAH
P: 13SEP2021 137110 39.7N 110.8W 2.0-4.3 AAAAA Utah area
O: 14SEP2021 20:41:22 41.8N 112.7W Ml=2.0 EMSC UTAH
P: 17SEP2021 137152 43.0N 111.5W 2.0-4.1 BBAAA Yellowstone/Wyoming
EASTERN U.S./CANADA
O: 15SEP2021 05:53:16 36.4N 89.5W Md=2.2 EMSC TENNESSEE
P: 14SEP2021 137081 36.9N 89.2W 2.0-4.1 AAAAA New Madrid area
HAWAII
O: 14SEP2021 20:25:20 19.2N 155.5W ML=3.0 EMSC ISLAND OF HAWAII, HAWAII
P: 14SEP2021 137010 18.8N 155.2W 3.0-4.4 AAAAA Hawaii
NEIC reported this earthquake of M 3.0 in Hawaii was felt with intensity II-III in the area(s) of Hawaii at Volcano.
SUPER TYPHOON CHANTHU PROMOTES SEISMICITY IN TAIWAN AND JAPAN
EARTHQUAKE SUMMARY FOR SEPTEMBER 13, 2021
The strongest earthquake in the world today was an M 5.8 in the Izu Islands, Japan. NEIC reported it was felt with intensity II-III in Japan in Shizuoka, Kanagawa, Tokyo, Saitama, Ibaraki and Fukushima. Super-Typhoon Chanthu was near this epicenter when this earthquake occurred and probably helped trigger this event as it made landfall in southern Japan as noted in this summary:
"Typhoon Chanthu (TD 19W) continued today north of Taiwan with winds up to 40 kts. It is expected to track to the west and north over the next week and possibly to impact regional seismicity in Central and northern Philippines and southern Japan around September 13-16." (September 13-14, 2021)
Today's event is the strongest within about 250 km of this epicenter since an M 6.3 on July 27, 2019 and prior to that an M 6.0 on April 1, 2016. These may be aftershocks of earthquakes of M 7.2 and 7.4 on September 5, 2004 to the west of today's epicenter. Forecast 137070 had expected enhanced seismicity within about 100 km of today's event around September 13.
The activity in Japan on September 5, 2004 was also associated with a strong typhoon as noted at the time in this summary:
"The earthquakes occurred at the same time as a strong typhoon which has caused considerable flooding and landslides in the area and a strong eruption of
Mount Asama, the major volcano in Japan." (September 5, 2004)
This epicenter in the Izu Islands, Japan is near 103 degrees from the event in Guerrero, Mexico of M 7.1 and was probably promoted by energy from that source.
O: 13SEP2021 22:46:06 32.5N 137.8E Mw=5.8 EMSC IZU ISLANDS, JAPAN REGION
P: 13SEP2021 137070 33.0N 137.0E 3.5-4.9 AAAAA Central/So. Honshu Japan
An earthquake of M 4.9-5.6 also occurred in Taiwan today. NEIC reported this event was felt with intensity IV in Taiwan in Taichung, and Taipei. CWB reported this earthquake was felt with intensity IV in Nantou, Taichung, Changhua, Hualien, Yilan; III in Miaoli, Yunlin, Hsinchu, Taitung; II in Taoyuan, Hsinchu, Taipei, Chiayi, Kaohsiung, Tainan and I in Penghu and Pingtung Counties, Taiwan.
The last event in Taiwan of M>=5.6 was an M 5.8 on August 4, 2021. Similar events also occurred on April 18 and March 25, 2021. The strongest event in Taiwan in the past year was an M 6.2 on December 10, 2020. Today's event followed the passage of Super-Typhoon Chanthu over this epicenter two days ago as noted in the summary at the time:
"Typhoon Chanthu (TD 19W) continued today over the Taiwan with winds up to 135 kts. It is expected to track to the west and north over the next week and possibly to impact regional seismicity in Central and northern Philippines and Taiwan around September 9-12." (September 11-12, 2021)
Forecast 137047 had expected today's event in Taiwan was likely within about 100 km of this epicenter around September 15.
O: 13SEP2021 10:41:28 24.1N 121.0E mb=4.9 EMSC TAIWAN
O: 13SEP2021 10:41:27 24.1N 121.0E ML=5.6 TAI Hualien, Taiwan
P: 15SEP2021 137047 25.0N 122.0E 4.0-5.8 AAAAA Ryukyu Islands
The strongest earthquake in the U.S. or Canada today occurred as an M 4.7-4.9 in Central Alaska. NEIC reported it was felt with intensity V in Salcha with IV in Eielson AFB, Alaska. Also felt with intensity III in Fairbanks, North Pole, Fort Wainwright, Delta Junction, Healy and Nenana. At M 4.9 this event is the strongest within about 100 km of this epicenter since an M 5.5 on January 7, 1990. A foreshock of M 4.7 hit the area on July 23, 2021. Forecasts 137180 and 137181 had expected enhanced activity in this area was likely in mid-September.
O: 14SEP2021 05:56:37 64.4N 146.8W Mw=4.7 EMSC CENTRAL ALASKA
O: 14SEP2021 05:56:37 64.4N 146.8W Mw=4.9 ANSS CENTRAL ALASKA
P: 11SEP2021 137180 62.7N 149.3W 3.2-5.3 BBBAA Central Alaska
P: 19SEP2021 137181 63.0N 148.6W 3.2-5.3 BBAAA Central Alaska
An M 3.6 was widely felt in western Los Angeles, California today. NEIC reported it was felt with intensity IV in Moorpark and III in Thousand Oaks, Westlake Village, Camarillo, Newbury Park, Oak Park, Sun Valley, Agoura Hills and many other communities in southern California. An M 4.0 last hit in western Los Angeles on April 5, 2021 and a year ago as an M 4.5 in central Los Angeles on September 19, 2020 - a year ago. Forecasts 136834 and 137095 had expected today's activity was likely within about 25 km between September 10 and 17.
O: 13SEP2021 14:59:33 34.2N 119.0W Mw=3.6 EMSC GREATER LOS ANGELES AREA, CALI
P: 10SEP2021 136834 34.0N 118.7W 2.5-4.6 BAAAA So. California
P: 17SEP2021 137095 34.0N 118.7W 2.5-4.6 BAAAA So. California
A series of light earthquakes also continued in the northern Baja California region today. This is an active region following geomagnetic storms. Today's activity included at least six events of M>=3. This activity was centered near local solar noon and local solar midnight with one of the strongest events occurring as an M 3.7 at 19:52 UT, within minutes of local solar noon, and may have been promoted by strong tidal stresses which maximize near these hours. Forecast 137038 had expected this activity around September 14.
O: 13SEP2021 09:51:06 30.9N 114.2W ML=3.8 EMSC GULF OF CALIFORNIA
O: 13SEP2021 09:53:10 30.9N 114.2W ML=3.6 EMSC GULF OF CALIFORNIA
O: 13SEP2021 19:52:11 30.9N 114.2W ML=3.7 EMSC GULF OF CALIFORNIA
O: 13SEP2021 20:35:09 30.9N 114.2W ML=3.6 EMSC GULF OF CALIFORNIA
O: 14SEP2021 05:40:53 31.0N 113.8W ML=3.7 EMSC GULF OF CALIFORNIA
O: 13SEP2021 20:14:51 30.8N 114.2W ML=3.6 EMSC GULF OF CALIFORNIA
P: 14SEP2021 137038 30.0N 114.0W 3.5-4.9 AAAAA Gulf of California
An event of M 3.8 also shook southeastern Colorado today. NEIC reported maximum intensity was felt with V at Pritchett with light shaking of II-III in Colorado at Springfield, Kim, Campo, Walsh, Lamar, La Junta, Rocky Ford and in Kenton, Oklahoma and Elkhart, Kansas. This is the strongest earthquake in Southeastern Colorado within about 100 km of this epicenter in the past 30 years. Forecast 137071 had expected today's activity to the west was likely around September 14.
O: 13SEP2021 09:27:14 37.4N 102.9W mb=3.8 EMSC COLORADO
P: 14SEP2021 137071 36.9N 105.1W 2.0-3.9 AABAA Colorado area
The strong series of light earthquakes in the Canary Islands, Spain continued today. The strongest of today's events was an M 3.9, getting into the range
where moderate quakes could be important in triggering a volcanic eruption or landslide-triggering tsunami. The M 3.9 is the strongest event in the Canary Islands in the past year. While an M 4.8 hit west of the Canary Islands on September 26, 2019, the last in the Canary Islands of M>=3.9 was an M 5.4 on December 27, 2013. At the time of the activity in December, 2013, this summary noted:
"A series of light earthquake began hitting the Canary Islands today. This appears to be a reinvigoration of the eruptive status of El Hierro Volcano and bears watching. This appears to have begun about the time of the full moon and tidal effects may have been an initiating effect. It is also likely that these earthquake were prompted by the renewed solar flare activity which began at the same time these small events began in the Canary Islands." (December 23, 2013)
"The swarm under El Hierro volcano in the Canary Islands continued at a reduced rate today. A volcanic eruption does not seem imminent in this region but a strong storm, solar flare or geomagnetic storm combined with strong astronomical tides could intensify this pre-eruption sequence." (December 25, 2013)
This earthquake is the strongest since volcanic activity began in 2011. It caused damage to buildings and rock slides but no injuries. Two roads were closed due to rock falls blocking them. A sudden elevation and the previous earthquakes caused local scientists to issue a warning raising the volcano alert level to yellow hours before this earthquake. Strong earthquakes such as this can lead to subsequent eruptions as they move materials around often opening vents for magma to reach the surface. Residents reported strong shaking and the quake was felt throughout the Canary Islands.
This is the strongest earthquake recorded in the past 25 years in the Canary Islands. The largest (and only ) previous earthquake recorded within 250 km of this epicenter of M>=5.4 occurred on May 22, 1964 with M 5.5. There has been some concern that sliding blocks, perhaps triggered by an earthquake of this size or larger, could slide from the volcanic slopes into the sea generating an Atlantic-wide tsunami." (December 27, 2013)
Forecast 137036 had expected today's activity in the Canary Islands between September 12 and 15.
O: 13SEP2021 23:14:25 28.6N 17.9W ML=3.2 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 23:30:36 28.6N 17.9W ML=3.0 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 23:32:17 28.6N 17.9W ML=3.3 EMSC CANARY ISLANDS, SPAIN REGION
O: 14SEP2021 00:19:48 28.6N 17.9W ML=3.1 EMSC CANARY ISLANDS, SPAIN REGION
O: 14SEP2021 03:25:59 28.6N 17.9W ML=3.0 EMSC CANARY ISLANDS, SPAIN REGION
O: 14SEP2021 04:52:13 28.6N 17.9W ML=3.1 EMSC CANARY ISLANDS, SPAIN REGION
O: 14SEP2021 06:00:00 28.6N 17.9W ML=3.9 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 23:10:17 28.6N 17.9W ML=3.3 EMSC CANARY ISLANDS, SPAIN REGION
P: 12SEP2021 137036 28.0N 16.0W 3.0-4.5 AABAA Canary Islands
P: 15SEP2021 137036 28.0N 17.0W 3.0-4.5 AAAAA Canary Islands
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: 14SEP2021 04:48:06 29.2N 50.0E ML=3.6 EMSC PERSIAN GULF
P: 11SEP2021 137048 29.0N 53.0E 3.5-5.3 BACAA So. Iran/Persian Gulf
O: 13SEP2021 15:59:33 37.3N 71.5E mb=4.3 EMSC HINDU KUSH REGION, AFGHANISTAN
P: 12SEP2021 137074 37.0N 72.0E 3.8-5.4 AAAAA Hindu Kush/Pakistan
O: 13SEP2021 22:19:50 44.8N 79.7E mb=4.2 EMSC EASTERN KAZAKHSTAN
P: 12SEP2021 137123 42.0N 79.0E 4.0-5.6 ACAAA Kirgizstan/Xinjiang
O: 13SEP2021 10:41:28 24.1N 121.0E mb=4.9 EMSC TAIWAN
O: 13SEP2021 10:41:27 24.1N 121.0E ML=5.6 TAI Hualien, Taiwan
P: 15SEP2021 137047 25.0N 122.0E 4.0-5.8 AAAAA Ryukyu Islands
INDONESIA AND PHILIPPINES
O: 13SEP2021 08:36:40 0.6S 127.5E mb=4.6 EMSC HALMAHERA, INDONESIA
P: 19SEP2021 136982 3.0S 127.0E 4.0-5.5 CCAAA Ceram area
O: 13SEP2021 23:08:59 2.3N 126.9E ML=4.0 EMSC MOLUCCA SEA
P: 12SEP2021 136974 2.0N 128.0E 4.0-5.4 AAAAA Halmahera
O: 14SEP2021 05:08:09 3.7S 146.8E ML=4.5 EMSC BISMARCK SEA
O: 13SEP2021 16:22:49 3.0S 147.5E mb=4.8 EMSC ADMIRALTY ISLANDS REGION, P.N.
O: 14SEP2021 03:54:03 3.7S 146.9E ML=4.4 EMSC BISMARCK SEA
P: 14SEP2021 136987 5.0S 146.0E 4.0-5.4 ABAAA New Ireland
P: 18SEP2021 136987 4.0S 146.0E 4.0-5.6 BAAAA New Ireland
CENTRAL AND SOUTH AMERICA
O: 13SEP2021 12:20:35 10.2N 85.8W mb=4.2 EMSC COSTA RICA
P: 11SEP2021 137021 11.0N 86.0W 3.5-5.5 AAAAA Nicaragua
NEIC reported this earthquake of M 4.2 in Costa Rica was felt with intensity II-III in the area(s) of Costa Rica at Samara, Guanacaste.
O: 14SEP2021 00:03:05 15.3S 73.7W mb=4.5 EMSC SOUTHERN PERU
P: 16SEP2021 137191 15.0S 73.0W 4.0-5.7 AAAAA Central Peru
NEIC reported this earthquake of M 4.5 in Southern Peru was felt with intensity II-III in the area(s) of Southern Peru at Arequipa, Peru.
O: 13SEP2021 16:33:12 15.7S 70.4W mb=4.4 EMSC SOUTHERN PERU
P: 8SEP2021 136929 17.0S 70.0W 4.0-5.6 BBAAA So. Peru/Bolivia
O: 14SEP2021 02:33:55 16.5S 73.7W ML=4.0 EMSC NEAR COAST OF SOUTHERN PERU
P: 14SEP2021 137197 17.0S 74.0W 4.0-5.4 AAAAA So. Peru/Bolivia
O: 14SEP2021 05:15:17 16.8N 99.7W ML=4.0 EMSC GUERRERO, MEXICO
O: 14SEP2021 00:02:54 16.8N 99.8W ML=4.2 EMSC GUERRERO, MEXICO
P: 14SEP2021 137017 17.0N 100.0W 3.5-5.3 AAAAA Michoacan, Mexico
O: 13SEP2021 08:38:48 17.1N 101.5W ML=3.9 EMSC OFFSHORE GUERRERO, MEXICO
P: 14SEP2021 137018 18.0N 103.0W 3.5-5.2 AAAAA Michoacan, Mexico
P: 18SEP2021 137017 17.0N 102.0W 3.5-5.3 BAAAA Michoacan, Mexico
O: 13SEP2021 08:38:38 17.3N 93.7W ML=3.9 EMSC VERACRUZ, MEXICO
P: 18SEP2021 137005 17.0N 94.0W 3.5-5.4 BAAAA Chiapas, Mexico
O: 14SEP2021 04:31:51 18.4N 73.5W ML=3.5 EMSC HAITI REGION
P: 16SEP2021 137029 19.0N 74.0W 3.4-5.2 AAAAA Haiti
O: 13SEP2021 11:57:13 19.0N 65.2W ML=3.3 EMSC PUERTO RICO REGION
P: 12SEP2021 137012 19.0N 65.0W 3.0-5.2 AAAAA Leeward Islands
NEIC reported this earthquake of M 3.8 in Puerto Rico was felt with intensity II-III in the area(s) of Puerto Rico in Fajardo and Humacao.
O: 14SEP2021 05:11:11 19.0N 68.3W ML=3.3 EMSC DOMINICAN REPUBLIC REGION
P: 16SEP2021 137028 19.0N 68.0W 3.4-5.1 AAAAA Puerto Rico
O: 13SEP2021 07:09:07 19.2N 64.5W ML=3.6 EMSC VIRGIN ISLANDS REGION
O: 13SEP2021 23:17:09 19.2N 64.3W ML=3.6 EMSC VIRGIN ISLANDS REGION
O: 13SEP2021 21:49:41 19.1N 64.5W ML=3.0 EMSC VIRGIN ISLANDS REGION
P: 12SEP2021 137012 19.0N 65.0W 3.0-5.2 AAAAA Leeward Islands
NEIC reported this earthquake of M 3.9 in the Virgin Islands was felt with intensity II-III in the area(s) of the Virgin Islands in Christiansted.
O: 13SEP2021 08:14:39 19.3N 104.8W ML=3.8 EMSC JALISCO, MEXICO
P: 18SEP2021 137018 19.0N 104.0W 3.5-5.3 BAAAA Michoacan, Mexico
O: 13SEP2021 11:10:00 21.0S 68.7W mb=4.3 EMSC TARAPACA, CHILE
P: 14SEP2021 137206 21.0S 69.0W 4.0-5.8 AAAAA Coast No. Chile
O: 13SEP2021 10:09:41 24.2S 66.9W mb=4.5 EMSC SALTA, ARGENTINA
P: 14SEP2021 137204 23.0S 66.0W 4.0-5.5 ABAAA Argentina
O: 14SEP2021 04:12:31 31.7S 72.1W mb=4.7 EMSC OFFSHORE COQUIMBO, CHILE
O: 14SEP2021 01:56:36 31.7S 71.9W Mw=4.8 EMSC OFFSHORE COQUIMBO, CHILE
P: 16SEP2021 137219 32.0S 72.0W 4.0-5.8 AAAAA Central Chile
NEIC reported this earthquake of M 4.8 in Valparaiso, Chile was felt with intensity IV-V in the area(s) of Valparaiso, Chile with V in Vina del Mar and Quilpue; IV in La Ligua and Quillota and II in Santiago.
NEIC reported an aftershock of M 4.4 in Coquimbo, Chile was felt with intensity II-III in the area(s) of Coquimbo, Chile at Vina Del Mar, Valparaiso and in Santiago, Chile.
O: 13SEP2021 11:22:01 37.3S 75.0W mb=4.6 EMSC OFF COAST OF BIO-BIO, CHILE
P: 16SEP2021 137220 38.0S 74.0W 4.0-5.6 BAAAA Central Chile
AFRICA AND EUROPE
O: 13SEP2021 23:10:17 28.6N 17.9W ML=3.3 EMSC CANARY ISLANDS, SPAIN REGION
P: 12SEP2021 137036 28.0N 16.0W 3.0-4.5 AABAA Canary Islands
P: 15SEP2021 137036 28.0N 17.0W 3.0-4.5 AAAAA Canary Islands
O: 13SEP2021 08:01:11 35.1N 26.6E ML=3.9 EMSC CRETE, GREECE
P: 15SEP2021 137053 36.0N 27.0E 3.0-4.8 AAAAA Aegean Sea
O: 13SEP2021 10:36:31 48.3N 9.0E ML=3.4 EMSC GERMANY
P: 14SEP2021 137114 48.0N 7.0E 3.0-5.3 AABAA Austria
O: 14SEP2021 02:32:01 79.3N 5.7E mb=4.5 EMSC SVALBARD REGION
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 13SEP2021 17:13:34 15.7S 167.8E mb=4.9 EMSC VANUATU
P: 9SEP2021 136934 16.0S 168.0E 4.0-5.4 BAAAA Vanuatu Islands
O: 13SEP2021 11:45:13 17.9S 178.5W mb=4.5 EMSC FIJI REGION
P: 14SEP2021 137199 18.0S 180.0W 4.0-5.8 AABAA Tonga Islands
O: 13SEP2021 14:43:17 22.6S 177.8W mb=4.6 EMSC SOUTH OF FIJI ISLANDS
P: 13SEP2021 137215 23.0S 177.0W 4.0-5.6 AAAAA Tonga Islands
No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.
OCEAN RIDGES
O: 13SEP2021 23:14:25 28.6N 17.9W ML=3.2 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 23:30:36 28.6N 17.9W ML=3.0 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 23:32:17 28.6N 17.9W ML=3.3 EMSC CANARY ISLANDS, SPAIN REGION
O: 14SEP2021 00:19:48 28.6N 17.9W ML=3.1 EMSC CANARY ISLANDS, SPAIN REGION
O: 14SEP2021 03:25:59 28.6N 17.9W ML=3.0 EMSC CANARY ISLANDS, SPAIN REGION
O: 14SEP2021 04:52:13 28.6N 17.9W ML=3.1 EMSC CANARY ISLANDS, SPAIN REGION
O: 14SEP2021 06:00:00 28.6N 17.9W ML=3.9 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 23:10:17 28.6N 17.9W ML=3.3 EMSC CANARY ISLANDS, SPAIN REGION
P: 12SEP2021 137036 28.0N 16.0W 3.0-4.5 AABAA Canary Islands
P: 15SEP2021 137036 28.0N 17.0W 3.0-4.5 AAAAA Canary Islands
O: 13SEP2021 14:11:27 60.0S 26.3W mb=5.0 EMSC SOUTH SANDWICH ISLANDS REGION
O: 13SEP2021 23:58:00 58.9S 25.1W mb=5.0 EMSC SOUTH SANDWICH ISLANDS REGION
P: 12SEP2021 137234 58.0S 25.0W 4.0-5.8 AAAAA So. Sandwich Islands
ZEALANDIA AND AUSTRALIA REGION
No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia
today. GeoNet did not report any felt events in the area.
JAPAN AND KURIL ISLANDS
O: 13SEP2021 22:46:06 32.5N 137.8E Mw=5.8 EMSC IZU ISLANDS, JAPAN REGION
P: 13SEP2021 137070 33.0N 137.0E 3.5-4.9 AAAAA Central/So. Honshu Japan
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 13SEP2021 09:51:06 30.9N 114.2W ML=3.8 EMSC GULF OF CALIFORNIA
O: 13SEP2021 09:53:10 30.9N 114.2W ML=3.6 EMSC GULF OF CALIFORNIA
O: 13SEP2021 19:52:11 30.9N 114.2W ML=3.7 EMSC GULF OF CALIFORNIA
O: 13SEP2021 20:35:09 30.9N 114.2W ML=3.6 EMSC GULF OF CALIFORNIA
O: 14SEP2021 05:40:53 31.0N 113.8W ML=3.7 EMSC GULF OF CALIFORNIA
O: 13SEP2021 20:14:51 30.8N 114.2W ML=3.6 EMSC GULF OF CALIFORNIA
P: 14SEP2021 137038 30.0N 114.0W 3.5-4.9 AAAAA Gulf of California
O: 13SEP2021 12:25:08 32.7N 115.8W Ml=2.0 EMSC SOUTHERN CALIFORNIA
P: 14SEP2021 137094 32.6N 116.1W 2.5-4.7 AAAAA So. California
O: 14SEP2021 02:29:06 34.0N 117.0W Ml=2.2 EMSC SOUTHERN CALIFORNIA
P: 13SEP2021 137097 34.1N 117.4W 2.5-4.4 AAAAA So. California
P: 19SEP2021 137096 33.9N 116.9W 2.5-4.8 BAAAA So. California
O: 13SEP2021 14:59:33 34.2N 119.0W Mw=3.6 EMSC GREATER LOS ANGELES AREA, CALI
P: 10SEP2021 136834 34.0N 118.7W 2.5-4.6 BAAAA So. California
P: 17SEP2021 137095 34.0N 118.7W 2.5-4.6 BAAAA So. California
O: 14SEP2021 01:22:22 35.7N 121.0W Md=2.2 EMSC CENTRAL CALIFORNIA
P: 13SEP2021 137090 35.8N 121.3W 2.5-4.6 AAAAA Off So. California
O: 13SEP2021 14:07:02 37.6N 119.4W Md=2.5 EMSC CENTRAL CALIFORNIA
P: 15SEP2021 137058 37.3N 119.4W 2.5-4.6 AAAAA California/Nevada area
NEIC reported this earthquake of M 2.5 in Central California was felt with intensity II-III in the area(s) of Central California at Gustine.
O: 13SEP2021 20:17:56 38.1N 122.2W Mh=2.2 EMSC SAN FRANCISCO BAY AREA, CALIF.
P: 14SEP2021 137066 38.0N 122.3W 2.5-4.8 AAAAA Central California
P: 15SEP2021 137066 37.9N 122.0W 2.5-4.6 AAAAA Central California
O: 13SEP2021 13:00:55 38.6N 119.5W Md=2.2 EMSC CENTRAL CALIFORNIA
O: 13SEP2021 10:48:57 38.9N 119.7W ml=2.0 EMSC NEVADA
O: 13SEP2021 13:00:55 38.6N 119.5W Md=2.2 EMSC CENTRAL CALIFORNIA
P: 17SEP2021 137062 38.3N 119.3W 2.5-4.6 BAAAA California/Nevada area
O: 13SEP2021 20:09:16 39.4N 118.6W ml=2.1 EMSC NEVADA
P: 10SEP2021 136800 38.2N 118.8W 2.5-4.4 BBAAA California/Nevada area
ALASKA
O: 14SEP2021 05:56:37 64.4N 146.8W Mw=4.7 EMSC CENTRAL ALASKA
P: 11SEP2021 137180 62.7N 149.3W 3.2-5.3 BBBAA Central Alaska
P: 19SEP2021 137181 63.0N 148.6W 3.2-5.3 BBAAA Central Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 13SEP2021 13:32:42 47.5N 121.9W Md=2.3 EMSC WASHINGTON
P: 20SEP2021 137151 47.5N 121.8W 2.0-4.4 CAAAA Washington state, U.S.
O: 13SEP2021 00:37:25 50.7N 130.5W MB=3.0 ECAN Port Hardy, BC
O: 13SEP2021 00:28:01 50.7N 130.5W MB=3.4 ECAN Port Hardy, BC
P: 17SEP2021 137158 52.0N 131.0W 3.0-4.9 BBAAA British Colombia
ROCKY MOUNTAINS REGION
O: 14SEP2021 06:28:44 31.7N 104.4W ML=2.3 EMSC WESTERN TEXAS
O: 13SEP2021 14:58:03 31.8N 103.8W ML=2.4 EMSC WESTERN TEXAS
P: 14SEP2021 137091 31.6N 103.6W 2.0-4.0 AAAAA SW U.S.A
P: 18SEP2021 137091 32.5N 104.6W 2.0-4.0 BAAAA SW U.S.A
O: 13SEP2021 09:27:14 37.4N 102.9W mb=3.8 EMSC COLORADO
P: 14SEP2021 137071 36.9N 105.1W 2.0-3.9 AABAA Colorado area
EASTERN U.S./CANADA
O: 13SEP2021 09:27:14 37.4N 102.9W mb=3.8 EMSC COLORADO
P: 14SEP2021 137071 36.9N 105.1W 2.0-3.9 AABAA Colorado area
O: 13SEP2021 18:26:21 34.3N 96.4W ML=2.1 EMSC OKLAHOMA
O: 13SEP2021 14:03:04 35.1N 95.4W ML=2.0 EMSC OKLAHOMA
P: 11SEP2021 137105 35.0N 96.0W 2.0-4.0 AAAAA Southern Plains
O: 10SEP2021 08:22:30 72.0N 75.1W MB=3.4 ECAN Pond Inlet, NU
P: 13SEP2021 137185 74.0N 73.0W 2.5-4.3 BBAAA Nunavit/Hudson Bay, Canada
HAWAII
O: 13SEP2021 17:58:49 21.5N 157.2W ML=3.4 EMSC OAHU REGION, HAWAII
P: 18SEP2021 137039 20.1N 156.1W 4.0-5.6 BBAAA Hawaii area
STRONG M 6.2 SHAKES JUJUY, ARGENTINA
EARTHQUAKE SUMMARY FOR SEPTEMBER 12, 2021
A strong earthquake of M 6.2 shook the area on the northern Argentina-Chile border in the Jujuy, Argentina area. NEIC reported maximum shaking of VII in Jujuy and VI in Salta, Argentina. Inensity V was reported from Tucumen, Argentina and IV in Bolivia at Tarija, Potosi and Villazon, Bolivia and in Antofagasta, Chile with intensity III. GUC reported this earthquake was felt with intensity IV in Atacama at Caldera, Chanaral, Copiapo, Diego de Almagro, Tierra Amarilla; Antofagasta with IV in Antofagasta, Baquedano, Maria Elena, Mejillone, Sierra Gorda, Taltal, Tocopill III in Calama and II in Sierra Gorda, Chile. A similar earthquake of M 6.3 hit south of this on November 30, 2020 and prior to that an M 6.3 on April 15, 2017. Today's mainshock occurred near local solar midnight and was probably promoted by tidal stresses which maximize near this hour. Forecast 137204 had expected today's activity was likely within about 150 km around September 14. This epicenter, like the M 4.2 in Hawaii today is located at the seventh node (52 degrees) from the M 7.1 in Mexico of September 8, 2021 and was probably promoted by energy from that source.
O: 12SEP2021 11:45:59 24.1S 66.8W ML=3.6 EMSC JUJUY, ARGENTINA
O: 12SEP2021 13:54:08 24.1S 67.5W mb=4.2 EMSC SALTA, ARGENTINA
O: 13SEP2021 05:18:11 23.9S 67.0W Mw=6.2 EMSC JUJUY, ARGENTINA
O: 13SEP2021 05:18 23.8S 67.5W mb=6.1 GUC Atacama at Caldera, Chanaral,
P: 14SEP2021 137204 23.0S 66.0W 4.0-5.5 AAAAA Argentina
An M 3.8-4.2 was widely felt in Hawaii today. NEIC reported intensity II-III in Hawaii at Hawaii National Park, Naalehu, Volcano, Captain Cook, Mountain View, Hilo, Kailua Kona, Kamuela, Kapauu. The area has been seeing increased and enhanced seismicity for several weeks. But the last earthquake in Hawaii of M>=4.2 occurred on August 18 (M 4.4) and June 3 (M 4.5). Forecast 137010 had expected today's activity in Hawaii was likely around September 14.
O: 12SEP2021 11:45:04 19.2N 155.4W ML=4.2 EMSC ISLAND OF HAWAII, HAWAII
O: 12SEP2021 14:31:45 19.2N 155.5W ML=3.2 EMSC ISLAND OF HAWAII, HAWAII
P: 14SEP2021 137010 18.8N 155.2W 3.0-4.4 AAAAA Hawaii
The series of light earthquakes continued today in western Texas with the largest of the day an M 3.8. NEIC reported this earthquake of M 2.6 in Western Texas was felt with intensity II-III in the area(s) of Western Texas at Rotan.
This is an aftershock of an M 3.6 in western Texas which was reported by NEIC to have been felt with intensity IV in Rotan, Snyder and II-III in Roby, Hamlin, Jayton, Hughes Springs and in Elmore City, Oklahoma. This area increased its activity on September 8, 2021 following an M 4.0-4.2 at that time and was noted in this summary as:
"A series of earthquakes north of Mexico in Western Texas was also energized today. The strongest of these was an M 4.2 but the swarm began near local solar midnight about 6 hours after the M 7.0 in Mexico and may have been promoted from Mexico or by tidal and geomagnetic stresses. An M 4.2 last occurred in this area on September 3 and is among the four largest such events in the region in the past year. Many of these have occurred at full or new moons and appear tidally related." (September 9, 2021)
Forecast 137091 had expected enhanced seismicity in this area was likely around
September 14.
O: 12SEP2021 15:37:16 31.6N 104.2W ML=2.8 EMSC WESTERN TEXAS
O: 12SEP2021 21:04:15 31.6N 104.2W ML=2.5 EMSC WESTERN TEXAS
O: 12SEP2021 21:15:42 31.6N 104.2W ML=2.5 EMSC WESTERN TEXAS
O: 12SEP2021 10:21:52 31.8N 103.8W ML=2.6 EMSC WESTERN TEXAS
O: 12SEP2021 23:20:21 31.8N 103.8W ML=3.2 EMSC WESTERN TEXAS
O: 12SEP2021 13:30:08 31.6N 104.2W ML=3.8 EMSC WESTERN TEXAS
P: 14SEP2021 137091 31.6N 103.6W 2.0-4.0 AAAAA SW U.S.A
The strongest earthquake in the U.S. or Canada today was an M 4.7 in the Unimak Island region of Alaska. This appears to be an aftershock of the M 5.1 on September 9, 2021. At the time this summary noted in this regard:
"The strongest earthquake in the U.S. or Canada today was an M 5.1 in the Unimak Island Region, Aleutians, Alaska. It was not reported felt in this remote area. The only earthquakes of M>=5 in the Unimak Islands in the past year were an M 5.1 on January 11, 2021 and an M 5.0 on November 4, 2020. Both occurred about 100 km west of today's epicenter. Forecast 136908 had expected today's activity was likely in early September within about 100 km of today's epicenters." (September 9, 2021)
Forecast 137171 had expected today's event within about 100 km was likely around
September 11.
O: 12SEP2021 17:03:09 53.4N 163.5W mb=4.7 EMSC UNIMAK ISLAND REGION, ALASKA
P: 11SEP2021 137171 54.1N 162.8W 3.5-5.1 AAAAA Unimak Islands, Aleutians
A strong series of earthquakes occurred in the Canary Islands today. More than 150 events were initially recorded. These may be foreshocks to a larger event or to a volcanic eruption perhaps at Teneriffe. This series began shortly after a Gamma Ray Burst (GMB) with maximum events around local solar midnight and may have been triggered by effects from these events. In the previous summary this summary had noted this as:
"A series of minor earthquakes has been occurring the Canary Islands of Spain over the past week. This may be exacerbated by a tropical weather system which
is currently located north of the Canary Islands and which may become a tropical depression. Low atmospheric pressures from tropical depressions can help unload volcanic areas such as this leading to volcanism." (September 12, 2021)
Forecasts 136777 and 137036 had expected this activity was likely around September 10-12. This area is at the 7th node (51.4 degrees) from the M 7.2 of August 14, 2021 and may have been promoted by energy from that source.
O: 12SEP2021 23:56:08 28.6N 17.9W ML=3.3 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 00:05:33 28.6N 17.9W ML=3.1 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 00:15:10 28.6N 17.9W ML=3.1 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 00:21:06 28.6N 17.9W ML=3.0 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 02:56:11 28.6N 17.9W ML=3.2 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 03:02:56 28.6N 17.9W ML=3.1 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 03:08:00 28.6N 17.9W ML=3.2 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 03:13:31 28.6N 17.9W ML=3.3 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 03:23:31 28.6N 17.9W ML=3.0 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 03:36:47 28.6N 17.9W ML=3.0 EMSC CANARY ISLANDS, SPAIN REGION
O: 12SEP2021 23:46:55 28.6N 17.9W ML=3.4 EMSC CANARY ISLANDS, SPAIN REGION
P: 10SEP2021 136777 28.0N 16.0W 3.0-4.6 AABAA Canary Islands
P: 12SEP2021 137036 28.0N 16.0W 3.0-4.5 AABAA Canary Islands
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: 13SEP2021 04:02:32 37.2N 58.9E Mw=5.1 EMSC NORTHEASTERN IRAN
P: 10SEP2021 136822 37.0N 59.0E 3.8-5.2 BAAAA No. Iran
NEIC reported this earthquake of M 5.1 in Iran was felt with intensity II-IV in the area(s) of Iran at Darreh Gaz, Meshed Khorasan-e Razavl and in Asgabat, Naysabur and Mari Mari.
O: 13SEP2021 03:46:46 33.7N 76.3E mb=4.3 EMSC KASHMIR-INDIA BORDER REGION
P: 14SEP2021 137086 35.0N 78.0E 3.8-5.4 ABBAA Northern India
O: 12SEP2021 19:04:37 70.3N 129.9E mb=4.3 EMSC NORTHWESTERN SAKHA, RUSSIA
INDONESIA AND PHILIPPINES
O: 12SEP2021 09:02:19 0.5S 99.7E Mw=5.0 EMSC SOUTHERN SUMATRA, INDONESIA
P: 10SEP2021 136739 2.0S 101.0E 4.0-5.6 ABBAA So. of Sumatera
O: 12SEP2021 10:44:15 2.7S 139.2E ML=4.6 EMSC NEAR N COAST OF PAPUA, INDONES
P: 14SEP2021 136998 5.0S 139.0E 4.0-5.7 ACAAA West Irian, PNG
O: 12SEP2021 13:34:34 3.7N 128.8E mb=4.7 EMSC NORTH OF HALMAHERA, INDONESIA
P: 12SEP2021 136974 2.0N 128.0E 4.0-5.4 ABAAA Halmahera
O: 12SEP2021 12:14:44 5.5N 126.4E mb=4.4 EMSC MINDANAO, PHILIPPINES
P: 15SEP2021 136975 6.0N 124.0E 4.0-5.4 BACAA Mindanao, Philippines
O: 12SEP2021 13:10:03 8.3S 119.5E mb=4.6 EMSC FLORES REGION, INDONESIA
P: 13SEP2021 136996 8.0S 119.0E 4.0-5.4 AAAAA Sumbawa Island area
CENTRAL AND SOUTH AMERICA
O: 12SEP2021 10:59:59 8.6S 80.5W mb=4.7 EMSC OFF COAST OF NORTHERN PERU
P: 15SEP2021 136990 9.0S 80.0W 4.0-5.5 BAAAA No. Peru
O: 12SEP2021 16:16:30 8.9N 85.5W ML=4.2 EMSC OFF COAST OF COSTA RICA
P: 12SEP2021 136972 9.0N 84.0W 3.5-5.1 AABAA Costa Rica
O: 12SEP2021 09:32:29 14.5N 93.7W mb=4.6 EMSC OFF COAST OF CHIAPAS, MEXICO
P: 11SEP2021 137004 15.0N 93.0W 3.5-5.1 AAAAA Chiapas, Mexico
O: 12SEP2021 15:05:19 16.6N 100.5W ML=4.1 EMSC OFFSHORE GUERRERO, MEXICO
P: 14SEP2021 137017 17.0N 100.0W 3.5-5.3 AAAAA Michoacan, Mexico
O: 12SEP2021 19:07:49 16.8N 93.8W ML=4.3 EMSC CHIAPAS, MEXICO
P: 11SEP2021 137004 15.0N 93.0W 3.5-5.1 ABAAA Chiapas, Mexico
NEIC reported an earthquake of M 3.2 in Puerto Rico was felt with intensity II-III in the area(s) of Puerto Rico at Adjuntas.
O: 12SEP2021 08:28:42 18.4N 73.8W ML=3.7 EMSC HAITI REGION
O: 12SEP2021 21:11:15 18.3N 74.1W ML=3.4 EMSC HAITI REGION
P: 16SEP2021 137029 19.0N 74.0W 3.4-5.2 BAAAA Haiti
O: 12SEP2021 21:45:02 21.7N 101.0W ML=3.8 EMSC GUANAJUATO, MEXICO
O: 12SEP2021 10:29:23 21.6N 101.1W ML=4.1 EMSC GUANAJUATO, MEXICO
P: 11SEP2021 137045 20.0N 99.0W 3.0-4.7 ABBAA Northern Mexico
O: 13SEP2021 05:18:11 23.9S 67.0W Mw=6.2 EMSC JUJUY, ARGENTINA
O: 13SEP2021 05:18 23.8S 67.5W mb=6.1 GUC Atacama at Caldera, Chanaral,
P: 14SEP2021 137204 23.0S 66.0W 4.0-5.5 AAAAA Argentina
O: 13SEP2021 04:12:28 30.0S 72.0W mb=4.7 EMSC OFFSHORE COQUIMBO, CHILE
P: 12SEP2021 137218 31.0S 69.0W 4.0-5.5 AACAA Central Chile
O: 12SEP2021 11:45:59 24.1S 66.8W ML=3.6 EMSC JUJUY, ARGENTINA
O: 12SEP2021 13:54:08 24.1S 67.5W mb=4.2 EMSC SALTA, ARGENTINA
O: 13SEP2021 05:18:11 23.9S 67.0W Mw=6.2 EMSC JUJUY, ARGENTINA
P: 14SEP2021 137204 23.0S 66.0W 4.0-5.5 AAAAA Argentina
AFRICA AND EUROPE
O: 13SEP2021 06:15:36 74.2N 10.7E mb=4.8 EMSC NORWEGIAN SEA
P: 18SEP2021 137188 72.0N 0.0E 3.0-4.8 BCAAA Norway
O: 12SEP2021 23:56:08 28.6N 17.9W ML=3.3 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 00:05:33 28.6N 17.9W ML=3.1 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 00:15:10 28.6N 17.9W ML=3.1 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 00:21:06 28.6N 17.9W ML=3.0 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 02:56:11 28.6N 17.9W ML=3.2 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 03:02:56 28.6N 17.9W ML=3.1 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 03:08:00 28.6N 17.9W ML=3.2 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 03:13:31 28.6N 17.9W ML=3.3 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 03:23:31 28.6N 17.9W ML=3.0 EMSC CANARY ISLANDS, SPAIN REGION
O: 13SEP2021 03:36:47 28.6N 17.9W ML=3.0 EMSC CANARY ISLANDS, SPAIN REGION
O: 12SEP2021 23:46:55 28.6N 17.9W ML=3.4 EMSC CANARY ISLANDS, SPAIN REGION
P: 10SEP2021 136777 28.0N 16.0W 3.0-4.6 AABAA Canary Islands
P: 12SEP2021 137036 28.0N 16.0W 3.0-4.5 AABAA Canary Islands
O: 12SEP2021 10:08:11 38.1N 23.8E ML=3.4 EMSC GREECE
P: 11SEP2021 137082 38.0N 21.0E 3.0-4.6 AABAA No. Greece
NEIC reported this earthquake of M 3.1 in northern Greece was felt with intensity II-III in the area(s) of northern Greece at Ayia Paraskevi (V) and in Attiki.
O: 13SEP2021 01:22:51 53.1N 9.2E ML=2.9 EMSC GERMANY
P: 14SEP2021 137166 52.0N 16.0E 3.0-4.7 ABCAA Poland
NEIC reported this earthquake of M 2.9 in Germany was felt with intensity II-IV in the area(s) of Germany at Ottersberg, Langwedel, Achim, Bremen and Blender.
SOUTHWEST PACIFIC
O: 12SEP2021 11:57:36 15.4S 174.4W Mw=5.2 EMSC TONGA
P: 17SEP2021 137199 16.0S 173.0W 4.0-5.6 BAAAA Tonga Islands
OCEAN RIDGES
O: 13SEP2021 06:15:36 74.2N 10.7E mb=4.8 EMSC NORWEGIAN SEA
P: 18SEP2021 137188 72.0N 0.0E 3.0-4.8 BCAAA Norway
O: 13SEP2021 02:34:04 59.8S 26.3W mb=5.1 EMSC SOUTH SANDWICH ISLANDS REGION
P: 12SEP2021 137234 58.0S 25.0W 4.0-5.8 ABAAA So. Sandwich Islands
ZEALANDIA AND AUSTRALIA REGION
No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia
today. GeoNet did not report any felt events in the area.
JAPAN AND KURIL ISLANDS
O: 12SEP2021 21:31:30 34.9N 139.8E ML=4.3 EMSC NEAR S. COAST OF HONSHU, JAPAN
P: 17SEP2021 137070 34.0N 139.0E 3.5-4.9 BAAAA Central/So. Honshu Japan
O: 12SEP2021 16:36:10 37.8N 142.0E mb=4.4 EMSC OFF EAST COAST OF HONSHU, JAPA
P: 17SEP2021 137089 38.0N 142.0E 4.0-5.4 BAAAA Off East Coast Honshu
O: 13SEP2021 04:59:45 39.3N 142.8E mb=4.8 EMSC NEAR EAST COAST OF HONSHU, JAP
P: 15SEP2021 137119 40.0N 143.0E 3.5-5.4 AAAAA Hokkaido, Japan
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 12SEP2021 17:33:52 31.0N 115.1W ML=3.1 EMSC BAJA CALIFORNIA, MEXICO
O: 12SEP2021 16:38:38 31.0N 115.1W ML=3.1 EMSC BAJA CALIFORNIA, MEXICO
P: 12SEP2021 137092 31.9N 116.3W 2.5-4.8 AAAAA So. California
O: 12SEP2021 21:31:27 35.8N 117.6W Ml=2.3 EMSC SOUTHERN CALIFORNIA
P: 14SEP2021 137055 35.7N 117.7W 2.5-4.6 AAAAA California/Nevada area
O: 12SEP2021 15:04:30 36.6N 121.3W Md=2.0 EMSC CENTRAL CALIFORNIA
P: 14SEP2021 137065 36.4N 121.0W 2.5-4.6 AAAAA Central California
O: 13SEP2021 03:48:56 37.6N 117.9W ml=2.1 EMSC NEVADA
O: 12SEP2021 12:46:08 37.3N 117.6W ML=2.3 EMSC CENTRAL CALIFORNIA
P: 11SEP2021 137059 37.4N 117.2W 2.5-4.9 AAAAA California/Nevada area
NEIC reported this earthquake of M 3.7 in Western Nevada was felt with intensity II-III in the area(s) of Western Nevada at Glenbrook.
O: 13SEP2021 02:20:05 40.3N 124.5W Md=2.4 EMSC OFFSHORE NORTHERN CALIFORNIA
O: 12SEP2021 13:54:26 40.3N 124.4W ML=2.1 EMSC NORTHERN CALIFORNIA
P: 13SEP2021 137136 40.2N 124.2W 2.5-4.6 AAAAA Off Coast of No. Calif
O: 12SEP2021 20:49:37 40.6N 122.2W Md=2.1 EMSC NORTHERN CALIFORNIA
P: 15SEP2021 137135 40.6N 122.4W 2.5-4.5 BAAAA Northern California
ALASKA
O: 12SEP2021 17:03:09 53.4N 163.5W mb=4.7 EMSC UNIMAK ISLAND REGION, ALASKA
P: 11SEP2021 137171 54.1N 162.8W 3.5-5.1 AAAAA Unimak Islands, Aleutians
O: 13SEP2021 06:11:42 59.7N 151.0W ml=3.2 EMSC KENAI PENINSULA, ALASKA
P: 14SEP2021 137176 60.1N 150.6W 3.2-5.3 AAAAA Central Alaska
NEIC reported this earthquake of M 3.2 in Kenai Peninsula, Alaska was felt with intensity II-III in the area(s) of Kenai Peninsula, Alaska at Homer.
O: 13SEP2021 03:16:03 63.1N 151.6W mb=3.6 EMSC CENTRAL ALASKA
P: 15SEP2021 137181 63.2N 151.4W 3.2-5.3 AAAAA Central Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 12SEP2021 15:11:27 46.7N 122.5W Md=2.3 EMSC WASHINGTON
P: 13SEP2021 137140 45.3N 121.7W 2.0-4.0 ABAAA Oregon state, U.S.
ROCKY MOUNTAINS REGION
O: 12SEP2021 15:37:16 31.6N 104.2W ML=2.8 EMSC WESTERN TEXAS
O: 12SEP2021 21:04:15 31.6N 104.2W ML=2.5 EMSC WESTERN TEXAS
O: 12SEP2021 21:15:42 31.6N 104.2W ML=2.5 EMSC WESTERN TEXAS
O: 12SEP2021 10:21:52 31.8N 103.8W ML=2.6 EMSC WESTERN TEXAS
O: 12SEP2021 23:20:21 31.8N 103.8W ML=3.2 EMSC WESTERN TEXAS
O: 12SEP2021 13:30:08 31.6N 104.2W ML=3.8 EMSC WESTERN TEXAS
P: 14SEP2021 137091 31.6N 103.6W 2.0-4.0 AAAAA SW U.S.A
O: 12SEP2021 11:26:43 32.8N 100.7W mb=3.8 EMSC WESTERN TEXAS
O: 12SEP2021 12:57:10 32.8N 100.7W mb=2.6 EMSC WESTERN TEXAS
O: 13SEP2021 02:48:55 32.8N 100.7W mb=2.4 EMSC WESTERN TEXAS
P: 14SEP2021 137091 31.6N 103.6W 2.0-4.0 AABAA SW U.S.A
O: 12SEP2021 18:05:57 44.3N 115.1W ML=3.2 EMSC SOUTHERN IDAHO
P: 13SEP2021 137126 44.4N 115.1W 2.0-4.0 AAAAA Montana/Idaho
NEIC reported this earthquake of M 3.2 in Southern Idaho was felt with intensity II-III in the area(s) of Southern Idaho at McCall.
EASTERN U.S./CANADA
O: 13SEP2021 04:04:59 36.2N 89.4W mb=3.2 EMSC TENNESSEE
P: 14SEP2021 137081 36.9N 89.2W 2.0-4.1 AAAAA New Madrid area
NEIC reported this earthquake of M 3.1 in Tennessee was felt with intensity II-III in the area(s) of Tennessee with IV in Ridgely and Obion and in Hornbeak, Tiptonville, Newbern, Dyersburg, Troy, and in Missouri at Caruthersville, Portageville and in Fulton, Kentucky.
O: 12SEP2021 22:04:50 36.8N 98.1W ML=2.5 EMSC OKLAHOMA
O: 13SEP2021 03:31:54 36.8N 98.1W ML=2.3 EMSC OKLAHOMA
O: 13SEP2021 00:49:55 36.7N 97.7W ML=2.1 EMSC OKLAHOMA
P: 11SEP2021 137106 36.0N 98.0W 2.0-4.3 AAAAA Southern Plains
HAWAII
O: 12SEP2021 11:45:04 19.2N 155.4W ML=4.2 EMSC ISLAND OF HAWAII, HAWAII
O: 12SEP2021 14:31:45 19.2N 155.5W ML=3.2 EMSC ISLAND OF HAWAII, HAWAII
P: 14SEP2021 137010 18.8N 155.2W 3.0-4.4 AAAAA Hawaii
MODERATE ACTIVITY IN KURIL; SOUTH SANDWICH ISLANDS
EARTHQUAKE SUMMARY FOR SEPTEMBER 11, 2021
The strongest earthquakes in the world today were an M 5.3 in the Kuril Islands and an M 5.5 in the South Sandwich Islands. The event in the Kuril Islands is the strongest earthquake in this region northwest of the Kuril Islands since an M 5.5 on July 9, 2019 and prior to that an M 6.0 on November 2, 2018. Forecastg 137156 had expected today's activity within about 50 km was likely around September 11. This event occurred within minutes of local solar midnight and may have been promoted by strong tidal stresses which maximize near this hour.
O: 12SEP2021 02:32:25 47.2N 146.8E Mw=5.3 EMSC NORTHWEST OF KURIL ISLANDS
P: 11SEP2021 137146 47.0N 146.0E 3.5-5.4 AAAAA So. Kurils
The M 5.5 in the South Sandwich Islands was not far from the antipode of the Kuril Islands event of M 5.3. This is part of the aftershock sequence following the M 8.1 in the South Sandwich Islands of August 12, 2021. Forecast 136964 had expected today's activity around September 9. This activity was near local solar noon and may have been promoted by high tidal stresses.
O: 11SEP2021 12:43:53 57.4S 26.1W mb=4.7 EMSC SOUTH SANDWICH ISLANDS REGION
O: 11SEP2021 09:23:03 59.6S 26.4W Mw=5.5 EMSC SOUTH SANDWICH ISLANDS REGION
O: 11SEP2021 09:10:47 56.1S 27.9W mb=5.1 EMSC SOUTH SANDWICH ISLANDS REGION
P: 9SEP2021 136964 57.0S 25.0W 4.0-5.6 AAAAA So. Sandwich Islands
The activity in the South Shetland Islands west of the South Sandwich Islands re-energized today with an M 4.8. This continues activity in this area which concentrated in April 1021. The only earthquake of M>=4.8 in the region in the past three month was an M 4.9 on August 28, 2021. Forecast 137235 had expected today's activity was likely in the South Shetland Islands in mid-September.
O: 12SEP2021 03:58:21 62.3S 57.9W mb=4.8 EMSC SOUTH SHETLAND ISLANDS
P: 15SEP2021 137235 61.0S 58.0W 4.0-5.6 BBAAA Southern Ocean
The strongest earthquake in the U.S. or Canada today was an M 3.6 in Southern Alaska. NEIC reported this earthquake of M 3.4 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska at Wasilla, Willow, Anchorage, Chugiak. This is not an uncommon earthquake for southern Alaska and is probably an aftershock of the M 7.0 in the Anchorage, Alaska area of November 30, 2018. The last such aftershock of M>=3.6 hit the area as an M 4.3 on August 12, 2021 with the M 8.1 in the South Sandwich Islands. Forecast 137176 had expected today's activity around September 14.
O: 11SEP2021 16:20:54 61.5N 149.9W ML=3.6 EMSC SOUTHERN ALASKA
P: 14SEP2021 137176 60.1N 150.6W 3.2-5.3 BAAAA Central Alaska
A series of minor earthquakes has been occurring the the Canary Islands of Spain over the past week. This may be exacerbated by a tropical weather system which
is currently located north of the Canary Islands and which may become a tropical depression. Low atmospheric pressures from tropical depressions can help unload volcanic areas such as this leading to volcanism.
O: 12SEP2021 00:16:12 28.5N 17.8W ML=1.5 EMSC CANARY ISLANDS, SPAIN REGION
P: 10SEP2021 136777 28.0N 16.0W 3.0-4.6 AAAAA Canary Islands
P: 12SEP2021 137036 28.0N 16.0W 3.0-4.5 AAAAA Canary Islands
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: 11SEP2021 22:45:19 27.3N 54.6E mb=4.4 EMSC SOUTHERN IRAN
O: 11SEP2021 20:55:22 27.3N 54.7E ML=4.0 EMSC SOUTHERN IRAN
P: 13SEP2021 137048 28.0N 54.0E 3.5-5.1 AAAAA So. Iran/Persian Gulf
NEIC reported these earthquakes of M 4.0 and 4.4 in Iran were felt with intensity II-III in the area(s) of Iran in Hormozgan at Bandar-e Langen, Bandar Abbas and Gheshm and in the United Arab Emirates.
O: 12SEP2021 06:10:01 36.2N 70.5E mb=4.4 EMSC HINDU KUSH REGION, AFGHANISTAN
P: 12SEP2021 137074 37.0N 72.0E 3.8-5.4 AAAAA Hindu Kush/Pakistan
INDONESIA AND PHILIPPINES
O: 11SEP2021 19:45:48 0.9N 126.3E ML=4.4 EMSC MOLUCCA SEA
P: 12SEP2021 136974 2.0N 128.0E 4.0-5.4 ABBAA Halmahera
O: 11SEP2021 08:38:22 1.6S 128.0E ML=4.1 EMSC KEPULAUAN OBI, INDONESIA
P: 9SEP2021 136727 3.0S 127.0E 4.0-5.4 ABAAA Ceram area
O: 11SEP2021 20:14:36 5.4N 126.4E ML=4.6 EMSC MINDANAO, PHILIPPINES
P: 15SEP2021 136975 6.0N 124.0E 4.0-5.4 BABAA Mindanao, Philippines
O: 11SEP2021 09:40:11 7.0S 125.1E mb=4.8 EMSC BANDA SEA
P: 19SEP2021 136979 7.0S 126.0E 4.0-5.4 CAAAA Banda Sea
O: 11SEP2021 14:29:06 9.2S 118.8E ML=4.0 EMSC SUMBAWA REGION, INDONESIA
P: 13SEP2021 136996 8.0S 119.0E 4.0-5.4 ABAAA Sumbawa Island area
O: 11SEP2021 14:19:10 11.9N 144.4E mb=4.7 EMSC SOUTH OF MARIANA ISLANDS
P: 9SEP2021 136772 13.0N 144.0E 4.0-5.4 ABAAA So. Marianas/Guam
No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.
CENTRAL AND SOUTH AMERICA
O: 11SEP2021 21:24:25 8.6S 80.6W mb=4.4 EMSC OFF COAST OF NORTHERN PERU
P: 15SEP2021 136990 9.0S 80.0W 4.0-5.5 BAAAA No. Peru
NEIC reported this earthquake of M 4.4 in Southern Peru was felt with intensity II-III in the area(s) of Southern Peru at Tacna.
O: 12SEP2021 01:12:30 9.4N 84.7W ML=4.0 EMSC COSTA RICA
O: 12SEP2021 01:20:30 9.4N 84.7W ML=4.6 EMSC COSTA RICA
P: 8SEP2021 136717 9.0N 84.0W 3.5-5.1 BAAAA Costa Rica
P: 12SEP2021 136972 9.0N 84.0W 3.5-5.1 AAAAA Costa Rica
O: 11SEP2021 14:08:20 10.1S 78.8W ML=4.0 EMSC NEAR COAST OF CENTRAL PERU
P: 15SEP2021 136990 9.0S 80.0W 4.0-5.5 BBAAA No. Peru
O: 11SEP2021 11:06:30 10.6N 86.0W ML=4.3 EMSC COSTA RICA
O: 11SEP2021 10:54:30 10.5N 86.2W ML=4.1 EMSC OFF COAST OF COSTA RICA
P: 11SEP2021 137021 11.0N 86.0W 3.5-5.5 AAAAA Nicaragua
O: 11SEP2021 10:27:41 14.9N 93.4W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
P: 11SEP2021 137004 15.0N 93.0W 3.5-5.1 AAAAA Chiapas, Mexico
O: 11SEP2021 09:21:28 16.5N 99.8W ML=4.1 EMSC OFFSHORE GUERRERO, MEXICO
O: 11SEP2021 21:56:05 17.1N 99.9W ML=4.1 EMSC GUERRERO, MEXICO
O: 11SEP2021 12:01:41 16.4N 100.0W ML=4.3 EMSC OFFSHORE GUERRERO, MEXICO
P: 14SEP2021 137017 17.0N 100.0W 3.5-5.3 BAAAA Michoacan, Mexico
O: 12SEP2021 04:10:25 17.9N 67.1W Md=3.3 EMSC PUERTO RICO REGION
O: 12SEP2021 06:48:22 17.9N 67.1W Md=3.2 EMSC PUERTO RICO REGION
P: 12SEP2021 137027 18.0N 66.0W 3.4-5.4 AAAAA Puerto Rico
O: 11SEP2021 10:24:37 18.5N 68.8W ML=3.0 EMSC DOMINICAN REPUBLIC
P: 13SEP2021 137034 20.0N 68.0W 3.0-4.4 ABAAA Bahamas/No. Caribbean
O: 11SEP2021 09:22:41 18.5N 73.8W ML=3.6 EMSC HAITI REGION
O: 12SEP2021 01:31:48 18.4N 73.4W ML=3.5 EMSC HAITI REGION
O: 12SEP2021 06:47:08 18.6N 74.2W ML=3.8 EMSC HAITI REGION
O: 11SEP2021 22:19:22 19.0N 73.8W ML=3.6 EMSC HAITI REGION
P: 7SEP2021 136771 19.0N 74.0W 3.4-5.3 BAAAA Puerto Rico
O: 11SEP2021 10:01:49 18.5S 71.5W mb=4.2 EMSC OFF COAST OF TARAPACA, CHILE
O: 11SEP2021 10:11:21 18.5S 71.7W mb=4.3 EMSC OFF COAST OF TARAPACA, CHILE
O: 11SEP2021 12:26:15 18.5S 71.5W mb=4.4 EMSC OFF COAST OF TARAPACA, CHILE
O: 11SEP2021 16:41:21 18.5S 71.6W mb=4.2 EMSC OFF COAST OF TARAPACA, CHILE
P: 11SEP2021 137213 20.0S 71.0W 4.0-5.9 ABAAA So. Peru/Bolivia
O: 11SEP2021 09:20:17 23.6N 108.5W ML=4.1 EMSC GULF OF CALIFORNIA
P: 6SEP2021 136778 20.0N 109.0W 3.5-5.0 BCAAA Gulf of California
O: 11SEP2021 19:25:17 26.9S 65.7W ML=4.0 EMSC TUCUMAN, ARGENTINA
P: 17SEP2021 137204 27.0S 63.0W 4.0-5.4 CABAA Argentina
O: 12SEP2021 01:54:25 31.7S 72.0W mb=4.1 EMSC OFFSHORE COQUIMBO, CHILE
P: 16SEP2021 137219 32.0S 72.0W 4.0-5.8 BAAAA Central Chile
AFRICA AND EUROPE
O: 12SEP2021 00:16:12 28.5N 17.8W ML=1.5 EMSC CANARY ISLANDS, SPAIN REGION
P: 10SEP2021 136777 28.0N 16.0W 3.0-4.6 AAAAA Canary Islands
P: 12SEP2021 137036 28.0N 16.0W 3.0-4.5 AAAAA Canary Islands
O: 11SEP2021 13:31:01 36.4N 27.1E ML=4.3 EMSC DODECANESE IS.-TURKEY BORDER R
P: 15SEP2021 137053 36.0N 27.0E 3.0-4.8 BAAAA Aegean Sea
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 12SEP2021 02:57:41 12.5S 166.2E Mw=5.3 EMSC SANTA CRUZ ISLANDS
P: 10SEP2021 136933 14.0S 167.0E 4.0-5.5 ABAAA Vanuatu Islands
OCEAN RIDGES
O: 11SEP2021 10:55:57 38.1S 94.3W mb=4.4 EMSC WEST CHILE RISE
P: 12SEP2021 137226 37.0S 93.0W 4.0-5.4 ABAAA Chile Rise
O: 11SEP2021 12:43:53 57.4S 26.1W mb=4.7 EMSC SOUTH SANDWICH ISLANDS REGION
O: 11SEP2021 09:23:03 59.6S 26.4W Mw=5.5 EMSC SOUTH SANDWICH ISLANDS REGION
O: 11SEP2021 09:10:47 56.1S 27.9W mb=5.1 EMSC SOUTH SANDWICH ISLANDS REGION
P: 9SEP2021 136964 57.0S 25.0W 4.0-5.6 AAAAA So. Sandwich Islands
O: 12SEP2021 03:58:21 62.3S 57.9W mb=4.8 EMSC SOUTH SHETLAND ISLANDS
P: 15SEP2021 137235 61.0S 58.0W 4.0-5.6 BBAAA Southern Ocean
ZEALANDIA AND AUSTRALIA REGION
O: 11SEP2021 14:58:50 33.8S 179.5E ML=4.0 EMSC SOUTH OF KERMADEC ISLANDS
P: 18SEP2021 137222 35.0S 179.0E 3.0-4.4 CBAAA North Island, N.Z.
O: 11SEP2021 16:12:20 46.3S 166.3E ML=3.7 EMSC OFF W. COAST OF S. ISLAND, N.Z
P: 13SEP2021 137231 45.0S 168.0E 3.0-4.9 ABBAA So. Island, N.Z.
JAPAN AND KURIL ISLANDS
O: 12SEP2021 05:32:02 29.9N 139.0E Mw=5.1 EMSC IZU ISLANDS, JAPAN REGION
P: 15SEP2021 137087 30.0N 141.0E 4.0-5.6 BABAA Off East Coast Honshu
O: 12SEP2021 02:17:05 33.1N 132.0E mb=4.5 EMSC SHIKOKU, JAPAN
P: 2SEP2021 136814 34.0N 132.0E 3.5-4.9 CAAAA Kyushu, Japan area
NEIC reported this earthquake of M 4.5 in Shikoku, Japan was felt with intensity II-III in the area(s) of Shikoku, Japan in Oita (V), Saiki and in Fukuoka.
O: 12SEP2021 02:32:25 47.2N 146.8E Mw=5.3 EMSC NORTHWEST OF KURIL ISLANDS
P: 11SEP2021 137146 47.0N 146.0E 3.5-5.4 AAAAA So. Kurils
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 11SEP2021 19:58:47 31.1N 114.7W ML=3.4 EMSC GULF OF CALIFORNIA
P: 14SEP2021 137038 30.0N 114.0W 3.5-4.9 BBAAA Gulf of California
O: 11SEP2021 21:57:35 31.4N 115.5W ML=3.3 EMSC BAJA CALIFORNIA, MEXICO
O: 11SEP2021 09:33:21 31.4N 115.6W ML=3.6 EMSC BAJA CALIFORNIA, MEXICO
P: 12SEP2021 137092 31.9N 116.3W 2.5-4.8 AAAAA So. California
O: 11SEP2021 22:30:08 37.2N 117.4W ml=2.0 EMSC NEVADA
O: 11SEP2021 22:24:06 37.2N 117.4W ml=2.2 EMSC NEVADA
P: 11SEP2021 137059 37.4N 117.2W 2.5-4.9 AAAAA California/Nevada area
O: 11SEP2021 23:19:29 37.3N 121.4W Md=2.4 EMSC NORTHERN CALIFORNIA
P: 15SEP2021 137066 37.9N 122.0W 2.5-4.6 BAAAA Central California
O: 12SEP2021 03:41:21 38.5N 119.5W ml=2.1 EMSC CENTRAL CALIFORNIA
P: 17SEP2021 137062 38.3N 119.3W 2.5-4.6 BAAAA California/Nevada area
O: 11SEP2021 23:22:42 38.8N 122.8W Md=2.5 EMSC NORTHERN CALIFORNIA
P: 13SEP2021 137067 38.5N 122.7W 2.5-4.6 AAAAA Central California
O: 11SEP2021 09:13:03 39.2N 123.1W Md=2.1 EMSC NORTHERN CALIFORNIA
P: 7SEP2021 136807 39.0N 123.1W 2.5-4.4 BAAAA Central California
O: 11SEP2021 14:25:33 39.9N 123.5W Md=2.5 EMSC NORTHERN CALIFORNIA
O: 11SEP2021 14:45:04 39.8N 123.5W Md=2.3 EMSC NORTHERN CALIFORNIA
P: 13SEP2021 137136 40.2N 124.2W 2.5-4.6 AAAAA Off Coast of No. Calif
NEIC reported this earthquake of M 2.5 in Northern California was felt with intensity II-III in the area(s) of Northern California at Laytonville.
ALASKA
O: 11SEP2021 16:20:54 61.5N 149.9W ML=3.6 EMSC SOUTHERN ALASKA
P: 14SEP2021 137176 60.1N 150.6W 3.2-5.3 BAAAA Central Alaska
O: 11SEP2021 18:37:53 63.0N 150.7W ML=3.2 EMSC CENTRAL ALASKA
P: 10SEP2021 136914 62.6N 151.4W 3.2-5.4 AAAAA Central Alaska
O: 11SEP2021 09:13:20 67.3N 156.2W ML=3.4 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: 11SEP2021 22:37:02 44.2N 115.1W ML=3.1 EMSC SOUTHERN IDAHO
P: 13SEP2021 137126 44.4N 115.1W 2.0-4.0 AAAAA Montana/Idaho
EASTERN U.S./CANADA
O: 11SEP2021 12:08:51 34.9N 85.6W Md=2.3 EMSC GEORGIA, USA
P: 12SEP2021 137075 35.0N 84.0W 2.0-4.1 AAAAA Kentucky/Tennessee/NC
O: 11SEP2021 12:51:40 28.6N 100.2W ML=2.9 EMSC SOUTHERN TEXAS
P: 1SEP2021 136785 29.0N 99.0W 3.0-4.9 CAAAA Northern Mexico
P: 15SEP2021 137046 28.0N 98.0W 3.0-4.8 BABAA Northern Mexico
O: 11SEP2021 18:14:37 36.7N 97.7W mb=2.5 EMSC OKLAHOMA
O: 12SEP2021 00:56:04 35.1N 95.4W ML=2.1 EMSC OKLAHOMA
P: 11SEP2021 137105 35.0N 96.0W 2.0-4.0 AAAAA Southern Plains
O: 11SEP2021 13:07:11 38.8N 97.0W mb=3.1 EMSC KANSAS
P: 17SEP2021 137106 37.0N 98.0W 2.0-4.1 BBAAA Southern Plains
NEIC reported this earthquake of M 3.1 in Kansas was felt with intensity II-III in the area(s) of Kansas at Woodbine, Herington (IV), Manhattan, Ellsworth, Goddard.
HAWAII
No earthquakes of M>=3 were located in Hawaii.
MODERATE QUAKES IN INDIA, VANUATU AND ANDAMAN ISLANDS MARK QUIET DAY
EARTHQUAKE SUMMARY FOR SEPTEMBER 10, 2021
It was a relatively quiet day in global seismicity. Earthquakes of M 5.2 occurred in the Andaman Islands of India and in Vanuatu. But neither of these were reported felt. The earthquake in Vanuatu is an aftershock of the M 7.1 ther of August 18, The M 5.2 in the Andaman Islands is the strongest in that region this year. The last earthquake in the Andaman Islands within about 250 km of today's epicenter with M>=5.2 occurred as an M 5.6 on May 22, 2019. The area can see great earthquakes so a resurgence in regional seismicity may be important to note. Forecast 136743 had expected today's activity in the Andaman Islands in early September. This epicenter is located at 144-146 degrees from both events
of M 7.1-7.2 in Mexico of September 8 and in Haiti of August 14, 2021 and was probably promoted by energy from those sources.
O: 11SEP2021 03:20:20 14.0N 93.0E mb=5.2 EMSC ANDAMAN ISLANDS, INDIA REGION
P: 5SEP2021 136743 13.0N 96.0E 4.0-5.8 CACAA Andaman Islands
O: 10SEP2021 17:45:21 14.6S 168.0E Mw=5.2 EMSC VANUATU
P: 10SEP2021 136933 14.0S 167.0E 4.0-5.5 AAAAA Vanuatu Islands
The largest event felt in the world today was an M 4.7 in Uttaranchal, India.
NEIC reported this earthquake of M 4.7 in Uttaranchal, India was felt with intensity IV-V in the area(s) of Uttaranchal, India in Chamoli and Gopeshwan, Karnaprayang, Rudraprayag, Srinagar, Dev Prayag, Dwarahat, Ranikhet, Vithara, Dehra Dun and Naintal. The last earthquake of equal or larger magnitude in the Uttaranchal region of India within about 200 km occurred on December 1, 2016 with 5.2. A strong earthquake M 6.6 occurred in the area on March 28, 1999 and also with M 6.8 on October 19, 1991. Forecast 136850 had expected today's activity to the east in early September.
O: 11SEP2021 00:28:32 30.5N 79.2E mb=4.7 EMSC UTTARANCHAL, INDIA
P: 4SEP2021 136850 30.0N 82.0E 3.8-5.2 CABAA Xizang
The largest earthquake in the world today was an M 5.6 in the South Sandwich Islands – another in the series of moderately strong daily earthquakes in this aftershock sequence which follows the M 8.1 of August 12. Today's event, like others in the area was not reported felt in this remote region. Forecast 136964 had expected today's activity was likely within about 150 km around September 7-9.
O: 10SEP2021 17:07:17 60.4S 26.4W Mw=5.6 EMSC SOUTH SANDWICH ISLANDS REGION
P: 7SEP2021 136964 59.0S 26.0W 4.0-5.6 BBAAA So. Sandwich Islands
P: 9SEP2021 136964 57.0S 25.0W 4.0-5.6 ACAAA So. Sandwich Islands
The strongest earthquake in the U.S. or Canada today was an M 4.1 in the Kenai Peninsula, Alaska. NEIC reported this earthquake of M 3.9 in the Kenai Peninsula, Alaska was felt with intensity II-III in the area(s) of the Kenai Peninsula, Alaska at Kasilof, Soldotna, Ninilchik, Sterling, Anchor Point, Kenai, Cooper Landng, Homer, Moose Pass, Anchorage. Three earthquakes of M>4.1 have occurred in the Kenai Peninsula area of Alaska in the past year - an M 4.7 on July 1, 2021; an M 4.4 on January 26, 2021 and an M 4.3 on July 19, 2021. Forecast 136912 had expected today's event within about 100 km was likely around September 8.
O: 11SEP2021 05:58:43 60.3N 151.3W Mw=4.1 EMSC KENAI PENINSULA, ALASKA
O: 11SEP2021 05:58:43 60.3N 151.3W Mw=4.9 ANSS KENAI PENINSULA, ALASKA
P: 8SEP2021 136912 61.3N 150.9W 3.2-5.3 BAAAA Central Alaska
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 11SEP2021 00:28:32 30.5N 79.2E mb=4.7 EMSC UTTARANCHAL, INDIA
P: 4SEP2021 136850 30.0N 82.0E 3.8-5.2 CABAA Xizang
O: 11SEP2021 01:34:06 37.5N 72.4E mb=4.0 EMSC TAJIKISTAN
P: 8SEP2021 136812 37.0N 71.0E 3.8-5.4 BAAAA Hindu Kush/Pakistan
O: 10SEP2021 08:39:53 53.9N 160.4E mb=4.3 EMSC NEAR EAST COAST OF KAMCHATKA
P: 6SEP2021 136897 55.0N 160.0E 4.0-5.6 BBAAA E. of Kamchatka
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 11SEP2021 02:54:30 0.5N 126.3E mb=4.1 EMSC MOLUCCA SEA
O: 11SEP2021 00:01:28 1.2N 126.7E ML=4.2 EMSC MOLUCCA SEA
O: 10SEP2021 09:34:19 0.4N 125.0E ML=4.0 EMSC MOLUCCA SEA
P: 5SEP2021 136719 0.0N 123.0E 4.0-5.5 BABAA Mindanao, Philippines
O: 10SEP2021 09:10:11 3.4S 140.8E ML=4.0 EMSC PAPUA, INDONESIA
O: 10SEP2021 16:46:53 2.4S 140.3E ML=4.0 EMSC NEAR N COAST OF PAPUA, INDONES
P: 6SEP2021 136736 3.0S 141.0E 4.0-5.4 BAAAA Papua New Guinea
O: 10SEP2021 15:33:20 2.9N 128.0E ML=4.0 EMSC MOLUCCA SEA
P: 10SEP2021 136718 7.0N 127.0E 4.0-5.4 ACAAA Halmahera
O: 10SEP2021 20:09:34 4.6S 153.3E mb=5.0 EMSC NEW IRELAND REGION, P.N.G.
P: 7SEP2021 136732 6.0S 154.0E 4.0-5.4 BBAAA New Britain
O: 11SEP2021 01:00:25 6.3N 94.7E ML=4.3 EMSC NICOBAR ISLANDS, INDIA REGION
P: 6SEP2021 136721 7.0N 93.0E 4.0-5.8 BABAA Nicobar Islands
O: 11SEP2021 04:56:41 6.3S 151.0E mb=5.0 EMSC NEW BRITAIN REGION, P.N.G.
P: 3SEP2021 136733 7.0S 150.0E 4.0-5.5 CAAAA New Ireland
O: 10SEP2021 19:24:37 10.2S 116.1E mb=4.4 EMSC SOUTH OF LOMBOK, INDONESIA
P: 7SEP2021 136931 11.0S 116.0E 4.0-5.6 BAAAA So. of Indonesia
O: 11SEP2021 03:20:20 14.0N 93.0E mb=5.2 EMSC ANDAMAN ISLANDS, INDIA REGION
P: 5SEP2021 136743 13.0N 96.0E 4.0-5.8 CACAA Andaman Islands
CENTRAL AND SOUTH AMERICA
O: 11SEP2021 02:36:30 7.4N 82.8W ML=4.3 EMSC SOUTH OF PANAMA
P: 7SEP2021 136717 7.0N 82.0W 3.5-5.3 BAAAA Costa Rica
O: 11SEP2021 06:06:08 9.3N 82.7W ML=4.3 EMSC PANAMA-COSTA RICA BORDER REGIO
P: 8SEP2021 136717 9.0N 84.0W 3.5-5.1 BAAAA Costa Rica
O: 11SEP2021 06:52:14 11.0S 79.2W ML=4.2 EMSC OFF COAST OF CENTRAL PERU
P: 7SEP2021 136735 9.0S 80.0W 4.0-5.6 BBAAA No. Peru
O: 10SEP2021 08:58:14 13.7N 90.6W mb=4.0 EMSC OFFSHORE GUATEMALA
P: 7SEP2021 136751 14.0N 90.0W 3.5-5.3 BAAAA Guatemala
O: 11SEP2021 06:26:57 15.4N 96.9W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO
P: 5SEP2021 136766 16.0N 97.0W 3.5-5.3 CAAAA Oaxaca, Mexico
O: 11SEP2021 02:34:08 15.7N 92.4W ML=4.0 EMSC CHIAPAS, MEXICO
P: 9SEP2021 136751 14.0N 92.0W 3.5-5.3 ABAAA Guatemala
O: 11SEP2021 00:58:45 16.5N 98.4W ML=4.0 EMSC GUERRERO, MEXICO
P: 7SEP2021 136767 18.0N 100.0W 3.5-5.5 BBBAA Oaxaca, Mexico
O: 10SEP2021 18:13:58 16.6N 100.6W ML=4.3 EMSC OFFSHORE GUERRERO, MEXICO
P: 8SEP2021 136759 17.0N 101.0W 3.5-5.3 AAAAA Michoacan, Mexico
O: 10SEP2021 13:49:04 18.0N 66.9W Md=3.0 EMSC PUERTO RICO REGION
P: 8SEP2021 136769 19.0N 66.0W 3.4-5.4 AAAAA Puerto Rico
O: 10SEP2021 21:07:08 24.1S 67.2W mb=4.6 EMSC SALTA, ARGENTINA
P: 6SEP2021 136936 22.0S 69.0W 4.0-5.6 BCBAA Coast No. Chile
O: 10SEP2021 09:48:16 18.5N 73.5W ML=3.3 EMSC HAITI REGION
O: 10SEP2021 11:31:59 18.8N 74.0W ML=3.4 EMSC HAITI REGION
O: 10SEP2021 11:43:23 18.8N 74.0W ML=3.3 EMSC HAITI REGION
O: 10SEP2021 08:29:41 18.4N 73.9W ML=3.4 EMSC HAITI REGION
P: 7SEP2021 136771 19.0N 74.0W 3.4-5.3 AABAA Puerto Rico
AFRICA AND EUROPE
O: 10SEP2021 17:31:14 45.6N 26.4E mb=3.8 EMSC ROMANIA
P: 5SEP2021 136881 46.0N 27.0E 3.0-4.9 BAAAA Romania/NW Turkey
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 10SEP2021 17:45:21 14.6S 168.0E Mw=5.2 EMSC VANUATU
P: 10SEP2021 136933 14.0S 167.0E 4.0-5.5 AAAAA Vanuatu Islands
OCEAN RIDGES
O: 10SEP2021 17:07:17 60.4S 26.4W Mw=5.6 EMSC SOUTH SANDWICH ISLANDS REGION
P: 7SEP2021 136964 59.0S 26.0W 4.0-5.6 BBAAA So. Sandwich Islands
P: 9SEP2021 136964 57.0S 25.0W 4.0-5.6 ACAAA So. Sandwich Islands
ZEALANDIA AND AUSTRALIA REGION
O: 10SEP2021 17:58:48 37.5S 179.4E ML=4.0 EMSC OFF E. COAST OF N. ISLAND, N.Z
O: 10SEP2021 17:58:48 37.5S 179.4E ML=4.0 GEONET Not Felt
P: 8SEP2021 136953 37.0S 178.0E 3.0-4.6 AAAAA North Island, N.Z.
O: 10SEP2021 18:00:58 45.1S 167.5E ML=3.6 EMSC SOUTH ISLAND OF NEW ZEALAND
P: 9SEP2021 136960 44.0S 169.0E 3.0-4.9 ABAAA So. Island, N.Z.
JAPAN AND KURIL ISLANDS
O: 10SEP2021 13:42:48 41.0N 142.5E mb=4.2 EMSC HOKKAIDO, JAPAN REGION
P: 8SEP2021 136856 42.0N 143.0E 3.5-5.5 AAAAA Hokkaido, Japan
O: 10SEP2021 20:00:51 45.5N 151.8E mb=4.8 EMSC KURIL ISLANDS
O: 10SEP2021 20:10:41 45.7N 151.7E mb=4.9 EMSC KURIL ISLANDS
P: 5SEP2021 136883 47.0N 153.0E 3.5-5.6 BBAAA So. Kurils
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 10SEP2021 09:45:44 30.7N 116.0W ML=3.3 EMSC BAJA CALIFORNIA, MEXICO
O: 10SEP2021 07:25:16 31.0N 115.5W ML=3.0 EMSC BAJA CALIFORNIA, MEXICO
P: 7SEP2021 136830 31.3N 116.3W 2.5-4.8 BAAAA So. California
O: 10SEP2021 11:19:36 32.5N 115.4W ML=2.4 EMSC BAJA CALIFORNIA, MEXICO
P: 7SEP2021 136830 32.6N 116.1W 2.5-4.9 BAAAA So. California
P: 8SEP2021 136831 33.0N 115.9W 2.5-5.0 AAAAA So. California
NEIC reported this earthquake of M 2.5 in Baja California, Mexico was felt with intensity II-III in the area(s) of Baja California, Mexico in Mexicali, Mexico.
O: 10SEP2021 17:29:40 33.8N 117.5W Ml=2.1 EMSC GREATER LOS ANGELES AREA, CALI
P: 6SEP2021 136833 33.7N 117.5W 2.5-4.6 BAAAA So. California
O: 10SEP2021 12:10:18 34.0N 119.9W Ml=2.2 EMSC CHANNEL ISLANDS REG., CALIFORN
P: 6SEP2021 136834 33.8N 119.7W 2.5-4.6 BAAAA So. California
O: 11SEP2021 01:17:44 34.1N 117.8W ML=2.5 EMSC GREATER LOS ANGELES AREA, CALI
P: 10SEP2021 136834 34.0N 118.7W 2.5-4.6 AAAAA So. California
O: 11SEP2021 00:57:31 36.6N 121.2W Md=2.3 EMSC CENTRAL CALIFORNIA
O: 10SEP2021 21:47:15 36.9N 121.6W Md=2.2 EMSC NORTHERN CALIFORNIA
O: 10SEP2021 22:49:32 36.3N 120.9W Md=2.0 EMSC CENTRAL CALIFORNIA
O: 10SEP2021 14:59:09 36.6N 121.3W Md=2.4 EMSC CENTRAL CALIFORNIA
P: 9SEP2021 136802 36.6N 120.7W 2.5-4.5 AAAAA Central California
O: 11SEP2021 04:54:23 37.9N 118.6W ml=2.4 EMSC CENTRAL CALIFORNIA
P: 10SEP2021 136800 38.2N 118.8W 2.5-4.4 AAAAA California/Nevada area
NEIC reported this earthquake of M 3.4 in Western Nevada was felt with intensity II-III in the area(s) of Western Nevada at Carson City and Glenbrook.
O: 10SEP2021 10:33:02 38.5N 119.5W Md=2.0 EMSC CENTRAL CALIFORNIA
P: 4SEP2021 136801 38.3N 119.3W 2.5-4.5 CAAAA California/Nevada area
O: 10SEP2021 08:19:41 38.7N 122.9W Md=2.5 EMSC NORTHERN CALIFORNIA
P: 7SEP2021 136807 39.0N 123.1W 2.5-4.4 BAAAA Central California
O: 11SEP2021 03:00:16 40.4N 124.6W Md=2.4 EMSC OFFSHORE NORTHERN CALIFORNIA
O: 10SEP2021 17:06:33 40.3N 124.3W Md=2.2 EMSC NORTHERN CALIFORNIA
P: 8SEP2021 136873 40.7N 124.6W 2.5-4.4 AAAAA Off Coast of No. Calif
ALASKA
O: 10SEP2021 14:00:03 51.5N 175.4W mb=3.8 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
P: 9SEP2021 136895 51.9N 174.0W 3.5-5.1 AAAAA Andreanoff Isls, Aleutians
O: 10SEP2021 09:15:16 53.4N 163.5W ml=3.7 EMSC UNIMAK ISLAND REGION, ALASKA
O: 10SEP2021 07:40:34 53.5N 163.7W ML=3.3 EMSC UNIMAK ISLAND REGION, ALASKA
O: 10SEP2021 09:15:16 53.4N 163.5W ml=3.7 EMSC UNIMAK ISLAND REGION, ALASKA
P: 6SEP2021 136908 54.0N 164.9W 3.5-5.1 BAAAA Unimak Islands, Aleutians
O: 10SEP2021 09:21:06 54.7N 156.9W ml=3.2 EMSC SOUTH OF ALASKA
P: 6SEP2021 136890 54.7N 157.9W 3.5-5.1 BAAAA Alaska Peninsula
O: 10SEP2021 14:58:57 56.6N 156.9W ML=3.4 EMSC ALASKA PENINSULA
P: 6SEP2021 136890 54.7N 157.9W 3.5-5.1 BBAAA Alaska Peninsula
O: 10SEP2021 07:52:09 60.1N 140.2W ML=3.0 EMSC SOUTHERN YUKON TERRITORY, CANA
P: 5SEP2021 136907 59.0N 139.0W 3.0-4.6 BBAAA Southeast Alaska
O: 11SEP2021 05:58:43 60.3N 151.3W Mw=4.1 EMSC KENAI PENINSULA, ALASKA
P: 8SEP2021 136912 61.3N 150.9W 3.2-5.3 BAAAA Central Alaska
O: 11SEP2021 05:58:27 68.3N 158.2W ml=3.4 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: 10SEP2021 14:12:41 31.6N 104.2W ML=2.5 EMSC WESTERN TEXAS
O: 10SEP2021 17:57:58 31.6N 104.2W ML=2.5 EMSC WESTERN TEXAS
O: 10SEP2021 10:29:42 31.7N 104.4W ML=2.3 EMSC WESTERN TEXAS
O: 10SEP2021 11:34:35 31.7N 104.4W ML=3.1 EMSC WESTERN TEXAS
O: 10SEP2021 14:35:38 31.7N 104.5W ML=2.0 EMSC WESTERN TEXAS
O: 10SEP2021 17:17:24 31.7N 104.5W ML=2.6 EMSC WESTERN TEXAS
O: 10SEP2021 11:51:13 32.1N 103.9W ML=2.3 EMSC NEW MEXICO
O: 10SEP2021 11:54:24 31.6N 104.1W ML=2.1 EMSC WESTERN TEXAS
P: 6SEP2021 136827 31.6N 103.6W 2.0-3.9 BAAAA SW U.S.A
O: 10SEP2021 17:37:50 44.3N 115.0W ML=3.1 EMSC SOUTHERN IDAHO
O: 10SEP2021 22:30:41 44.3N 115.1W ML=3.2 EMSC SOUTHERN IDAHO
O: 10SEP2021 23:06:26 44.3N 115.2W ML=3.3 EMSC SOUTHERN IDAHO
O: 10SEP2021 16:18:09 44.3N 115.0W Ml=2.2 EMSC SOUTHERN IDAHO
P: 7SEP2021 136862 44.4N 115.2W 2.0-4.0 BAAAA Montana/Idaho
P: 10SEP2021 136863 44.6N 116.0W 2.0-4.0 AAAAA Montana/Idaho
NEIC reported these earthquakes of M 3.1, 3.2 and 3.3 in Southern Idaho were felt with intensity II-III in the area(s) of Southern Idaho in Stanley and Ketchum.
EASTERN U.S./CANADA
O: 10SEP2021 08:22:30 72.0N 75.1W ML=3.4 EMSC BAFFIN ISLAND REGION, CANADA
HAWAII
O: 11SEP2021 03:22:30 19.2N 155.5W ML=3.0 EMSC ISLAND OF HAWAII, HAWAII
P: 3SEP2021 136779 19.3N 155.6W 4.0-5.7 CAAAA Hawaii area
P: 10SEP2021 136779 20.4N 155.1W 4.0-5.6 ABAAA Hawaii area
MODERATE EARTHQUAKE ROCKS GUADELOUPE, LEEWARD ISLANDS
EARTHQUAKE SUMMARY FOR SEPTEMBER 9, 2021
An M 5.0 was felt widely in the Guadeloupe area of the Leeward Islands today. NEIC reported it was felt with maximum intensity IV in Guadeloupe at Anse-Bertrand Grande-Terre and Les Abymes with intensity II-III in Guatdeloup at Le Moule, Sante-Anne, Le Gosier, Point-a-Pitre, Baie-Mahault and Lamentin Basse-Terre and in Antigua and Barbuda at English Harbour Saint Paul and All Saints Saint John. The only earthquake of larger magnitude in Guadeloupe in the past year was an M 5.8 on March 26, 2021 and today's event may be an aftershock of that. Forecast 136753 had expected today's activity was likely within about 100 km of the epicenter in early September.
O: 10SEP2021 00:43:19 16.8N 61.2W mb=5.0 EMSC GUADELOUPE REGION, LEEWARD ISL
P: 4SEP2021 136753 17.0N 60.0W 3.0-5.0 CAAAA Leeward Islands
An M 4.3 off the coast of Northern California today was widely felt in Northern California with intensity II-III in Petrolia, Ferndale, Fortuna, Whitethorn, Loleta,m Eureka, Aracata, Petaluma and Earlmart. This is the strongest earthquake off the coast of northern California within about 150 km of this epicenter since an M 5.1 on July 18 and an M 4.4 aftershock on July 21, 2021. Forecast 136873 had expected today's event within about 50 km of this epicenter was likely around September 8. The mainshock occurred within about an hour of local solar noon and may have been promoted by strong tidal stresses which maximize near this hour with this new moon as noted in this and previous issues of this summary:
"The new moon arrived at 00:52 UT on September 7, 2021. Longitudes which were near local solar midnight at this time are in the Atlantic Ocean and western Europe near 15 West and include areas of the Central Mid-Atlantic and the South Sandwich Islands while those at local solar noon are near 165 East and include areas of the northern Kurils and the Sea of Okhotsk, Near Islands and western Aleutians as well as the Vanuatu/Loyalty Islands, Kermadec-Tonga-Fiji-New Zealand arc. These areas will see maximum tidal stresses with this new moon and are most likely to see enhanced seismicity in the next week." (September 6-9, 2021)
O: 9SEP2021 21:57:52 40.3N 124.7W Mw=4.3 EMSC OFFSHORE NORTHERN CALIFORNIA
O: 10SEP2021 00:03:53 40.3N 124.4W Md=2.2 EMSC OFFSHORE NORTHERN CALIFORNIA
P: 8SEP2021 136873 40.7N 124.6W 2.5-4.4 AAAAA Off Coast of No. Calif
The strongest earthquake in the U.S. or Canada today was an M 5.1 in the Unimak Island Region, Aleutians, Alaska. It was not reported felt in this remote area. The only earthquakes of M>=5 in the Unimak Islands in the past year were an M 5.1 on January 11, 2021 and an M 5.0 on November 4, 2020. Both occurred about 100 km west of today's epicenter. Forecast 136908 had expected today's activity was likely in early September within about 100 km of today's epicenters. Like the M 5.1 in the West Chile Rise today this epicenter is located at the sixth node (60 degrees) from the epicenter of the M 7.1 in Mexico two days ago and may have been promoted by energy from that source.
O: 9SEP2021 19:23:26 53.6N 163.6W mb=5.1 EMSC UNIMAK ISLAND REGION, ALASKA
O: 10SEP2021 05:57:54 53.2N 163.4W mb=4.0 EMSC UNIMAK ISLAND REGION, ALASKA
P: 2SEP2021 136908 54.6N 163.6W 3.5-5.0 CAAAA Unimak Islands, Aleutians
P: 6SEP2021 136908 54.0N 164.9W 3.5-5.1 BAAAA Unimak Islands, Aleutians
A light earthquake of M 2.4-2.8 occurred today in the St. Lawrence Valley area of Quebec, Canada. ECAN reported it was lightly felt in the Lake Pocatiere region. The only event in this region in the past year within about 200 km of this epicenter with greater magnitude was an M 3.4 on December 28, 2020. Forecast 136860 had expected today's event within about 50 km was likely around September 9.
O: 09SEP2021 13:37:56 47.4N 70.2W MB=2.8 ECAN La Pocatiere, QC. Felt
O: 08SEP2021 12:05:42 47.4N 70.4W MB=0.9 ECAN Charlevoix Seismic Zone
O: 9SEP2021 13:37:55 47.4N 70.2W ML=2.4 EMSC ST. LAWRENCE VALLEY REG., CANA
P: 9SEP2021 136860 47.0N 70.0W 2.0-4.1 AAAAA Maine
Moderate earthquakes also continued in the series in the West Chile Rise which began shortly after the M 7.1 in Mexico of September 8. The largest of these today was also the largest event in the world on this day - an M 5.1 south of the previous swarm. It was not reported felt in this remote area. Like the M 5.0 in the Unimak Islands area of Alaska today located at 60 degrees (node 6) from the Mexico event and was probably promoted by energy from that source. Forecast 136956 had expected this event was likely within about 50 km of this epicenter around September 9. This event occurred within about an hour of local solar midnight and may have been promoted by high earth tides which maximize near this hour.
O: 10SEP2021 04:21:29 42.8S 83.7W mb=5.1 EMSC WEST CHILE RISE
P: 9SEP2021 136956 43.0S 83.0W 4.0-5.5 AAAAA Chile Rise
Earthquakes also continued to the north of this near the previous swarm.
When this swarm began two days ago, this summary noted in this regard:
"A strong series of events also hit the West Chile Rise in the Pacific Ocean today and included events of M 5.6, 5.4, 5.3 and 5.2. The largest of these occurred near local solar noon and may have been promoted by tidal effects with the new moon, but energy from the M 7.0 in Mexico may also have enhanced this activity. This is the strongest activity within about 200 km on the West Chile Rise in more than 10 years - following an M 5.9 about 200 km southeast of this on May 20, 2010 and an M 6.0 to the east on June 5, 2008. Forecast 136956 had expected today's activity was likely to the southeast in the Chile Rise around September 7. This activity is at the sixth node from the M 7.2 in Haiti of August 14 and may have been promoted by energy from that source." (September 8-9, 2021)
O: 09SEP2021 16:27:22 38.0S 94.0W mb=4.6 EMSC WEST CHILE RISE
O: 9SEP2021 11:52:31 38.0S 94.1W mb=4.5 EMSC WEST CHILE RISE
P: 7SEP2021 136956 41.0S 91.0W 4.0-5.6 ACBAA Chile Rise
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: 10SEP2021 05:45:02 23.9N 122.1E mb=4.7 EMSC TAIWAN REGION
O: 10SEP2021 05:45:04 23.9N 122.1E ML=4.8 TAI Hualien, Taiwan
P: 10SEP2021 136791 22.0N 122.0E 4.0-5.4 ABAAA Taiwan
CWB reported this earthquake was felt with intensity II in Hualien and Yilan and I in Nantou, Taichung, Changhua, Yunlin, and Chiayi Counties, Taiwan.
O: 10SEP2021 05:22:40 36.6N 70.9E mb=4.4 EMSC HINDU KUSH REGION, AFGHANISTAN
O: 09SEP2021 23:43:15 36.8N 71.2E mb=4.5 EMSC HINDU KUSH REGION, AFGHANISTAN
P: 8SEP2021 136812 37.0N 71.0E 3.8-5.4 AAAAA Hindu Kush/Pakistan
O: 9SEP2021 23:48:35 37.6N 80.9E mb=4.5 EMSC SOUTHERN XINJIANG, CHINA
P: 7SEP2021 136859 42.0N 82.0E 4.0-5.8 ACAAA Kirgizstan/Xinjiang
O: 10SEP2021 00:24:46 53.1N 99.0E mb=4.2 EMSC IRKUTSKAYA OBLAST', RUSSIA
P: 31AUG2021 136641 51.0N 98.0E 3.0-4.4 CBAAA So. Siberia
INDONESIA AND PHILIPPINES
O: 9SEP2021 15:22:58 3.9S 135.0E ML=4.3 EMSC PAPUA, INDONESIA
P: 31AUG2021 136467 4.0S 135.0E 4.0-5.4 CAAAA West Irian, PNG
O: 10SEP2021 01:42:21 4.6S 101.7E mb=4.4 EMSC SOUTHERN SUMATRA, INDONESIA
P: 10SEP2021 136739 2.0S 101.0E 4.0-5.6 ACAAA So. of Sumatera
O: 9SEP2021 15:18:00 5.4N 126.7E ML=4.3 EMSC MINDANAO, PHILIPPINES
P: 10SEP2021 136718 7.0N 127.0E 4.0-5.4 ABAAA Halmahera
O: 9SEP2021 12:49:37 9.1S 123.3E ML=4.2 EMSC TIMOR REGION, INDONESIA
P: 9SEP2021 136729 7.0S 123.0E 4.0-5.4 ABAAA Flores Island area
O: 9SEP2021 17:23:32 13.8N 144.9E mb=4.5 EMSC GUAM REGION
P: 9SEP2021 136772 13.0N 144.0E 4.0-5.4 AAAAA So. Marianas/Guam
NEIC reported this earthquake of M 4.5 in Guam was felt with intensity II-III in the area(s) of Guam at Tamuning, Talofofo and Merizo.
CENTRAL AND SOUTH AMERICA
O: 9SEP2021 17:58:25 9.8S 79.8W mb=4.7 EMSC OFF COAST OF NORTHERN PERU
P: 7SEP2021 136735 9.0S 80.0W 4.0-5.6 AAAAA No. Peru
O: 10SEP2021 00:27:06 15.5N 96.8W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO
P: 7SEP2021 136747 16.0N 95.0W 3.5-5.1 BABAA Chiapas, Mexico
O: 09SEP2021 10:56:22 16.8N 99.7W ML=4.2 EMSC GUERRERO, MEXICO
O: 09SEP2021 15:35:31 16.8N 99.8W ML=4.0 EMSC GUERRERO, MEXICO
O: 09SEP2021 19:52:36 16.8N 99.9W ML=4.0 EMSC OFFSHORE GUERRERO, MEXICO
O: 10SEP2021 04:04:33 16.7N 100.0W ML=4.0 EMSC OFFSHORE GUERRERO, MEXICO
P: 7SEP2021 136767 18.0N 100.0W 3.5-5.5 BAAAA Oaxaca, Mexico
P: 8SEP2021 136759 17.0N 101.0W 3.5-5.3 AAAAA Michoacan, Mexico
O: 10SEP2021 00:43:19 16.8N 61.2W mb=5.0 EMSC GUADELOUPE REGION, LEEWARD ISL
P: 4SEP2021 136753 17.0N 60.0W 3.0-5.0 CAAAA Leeward Islands
O: 09SEP2021 22:31:53 18.0N 66.2W Md=3.1 EMSC PUERTO RICO
O: 9SEP2021 08:52:14 18.0N 66.9W Md=3.0 EMSC PUERTO RICO
P: 8SEP2021 136769 19.0N 66.0W 3.4-5.4 AAAAA Puerto Rico
O: 10SEP2021 03:25:38 18.2S 69.9W mb=4.6 EMSC SOUTHERN PERU
O: 10SEP2021 03:25 18.2S 70.0W mb=4.4 GUC Arica and Parinacotga at Arica
P: 8SEP2021 136930 19.0S 69.0W 4.0-5.7 AAAAA So. Peru/Bolivia
GUC reported this earthquake was felt with intensity III in Arica and Parinacotga at Arica, Pocon Chile, Putre, San Miguel de Azapa and II in Codpa, Chile,
O: 9SEP2021 07:38:49 18.5N 73.7W ML=3.3 EMSC HAITI REGION
O: 09SEP2021 07:45:22 18.6N 74.1W ML=3.5 EMSC HAITI REGION
P: 7SEP2021 136771 19.0N 74.0W 3.4-5.3 AAAAA Puerto Rico
O: 9SEP2021 16:10:01 19.2N 64.6W Md=3.6 EMSC VIRGIN ISLANDS REGION
P: 8SEP2021 136753 19.0N 65.0W 3.0-5.4 AAAAA Leeward Islands
O: 10SEP2021 05:45:56 20.6S 69.3W mb=4.0 EMSC TARAPACA, CHILE
P: 6SEP2021 136935 21.0S 68.0W 4.0-5.8 BAAAA Argentina
NEIC reported this earthquake of M 4.0 in Tarapaca, Chile was felt with intensity II-III in the area(s) of Tarapaca, Chile at Iquique.
O: 9SEP2021 19:59:48 21.7N 101.1W ML=3.9 EMSC GUANAJUATO, MEXICO
P: 7SEP2021 136767 18.0N 100.0W 3.5-5.5 ACAAA Oaxaca, Mexico
AFRICA AND EUROPE
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 9SEP2021 21:56:46 17.7S 178.7W mb=4.5 EMSC FIJI REGION
P: 8SEP2021 136932 18.0S 178.0W 4.0-5.8 AAAAA Tonga Islands
O: 9SEP2021 11:22:17 20.0S 178.1W mb=4.1 EMSC FIJI REGION
P: 8SEP2021 136944 20.0S 175.0W 4.0-5.7 AACAA Tonga Islands
O: 9SEP2021 07:18:09 21.8S 179.3W Mw=5.3 EMSC FIJI REGION
P: 9SEP2021 136945 25.0S 180.0W 4.0-5.4 ACAAA Tonga Islands
O: 10SEP2021 00:19:57 25.9S 179.4W mb=5.0 EMSC SOUTH OF FIJI ISLANDS
P: 9SEP2021 136945 25.0S 180.0W 4.0-5.4 AAAAA Tonga Islands
O: 10SEP2021 00:21:00 26.2S 178.4E mb=4.7 EMSC SOUTH OF FIJI ISLANDS
P: 7SEP2021 136946 25.0S 179.0E 4.0-5.4 BBAAA Tonga/Fiji
No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.
OCEAN RIDGES
O: 09SEP2021 16:27:22 38.0S 94.0W mb=4.6 EMSC WEST CHILE RISE
O: 9SEP2021 11:52:31 38.0S 94.1W mb=4.5 EMSC WEST CHILE RISE
P: 7SEP2021 136956 41.0S 91.0W 4.0-5.6 ACBAA Chile Rise
O: 10SEP2021 04:21:29 42.8S 83.7W mb=5.1 EMSC WEST CHILE RISE
P: 9SEP2021 136956 43.0S 83.0W 4.0-5.5 AAAAA Chile Rise
O: 9SEP2021 12:59:01 59.4S 25.4W mb=5.1 EMSC SOUTH SANDWICH ISLANDS REGION
P: 9SEP2021 136964 57.0S 25.0W 4.0-5.6 ACAAA So. Sandwich Islands
ZEALANDIA AND AUSTRALIA REGION
No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia
today. GeoNet did not report any felt events in the area.
JAPAN AND KURIL ISLANDS
O: 10SEP2021 02:01:25 26.1N 128.6E mb=4.7 EMSC RYUKYU ISLANDS, JAPAN
P: 8SEP2021 136788 26.0N 126.0E 4.0-5.5 AABAA Ryukyu Islands
O: 10SEP2021 02:10:26 31.0N 139.7E mb=4.3 EMSC IZU ISLANDS, JAPAN REGION
P: 6SEP2021 136824 33.0N 141.0E 4.0-5.6 BBAAA Off East Coast Honshu
O: 9SEP2021 20:49:27 42.9N 143.4E mb=4.0 EMSC HOKKAIDO, JAPAN REGION
P: 8SEP2021 136856 42.0N 143.0E 3.5-5.5 AAAAA Hokkaido, Japan
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 9SEP2021 09:12:09 31.9N 115.9W ML=3.3 EMSC BAJA CALIFORNIA, MEXICO
P: 7SEP2021 136830 31.3N 116.3W 2.5-4.8 AAAAA So. California
O: 9SEP2021 15:01:24 34.1N 117.4W ML=2.5 EMSC GREATER LOS ANGELES AREA, CALI
P: 6SEP2021 136833 33.7N 117.5W 2.5-4.6 BAAAA So. California
NEIC reported this earthquake of M 2.6 in Eastern Los Angeles, California was felt with intensity II-III in the area(s) of Eastern Los Angeles, California at Fontana, Rialto, Rancho Cucamonga, San Bernardno, Riverside, Chino and Los Angeles.
O: 10SEP2021 00:06:12 35.7N 117.5W Ml=2.3 EMSC SOUTHERN CALIFORNIA
P: 9SEP2021 136796 36.1N 118.1W 2.5-4.6 AAAAA California/Nevada area
O: 09SEP2021 14:29:33 38.6N 119.4W ml=2.4 EMSC CENTRAL CALIFORNIA
O: 09SEP2021 14:37:21 38.6N 119.4W ml=2.3 EMSC CENTRAL CALIFORNIA
O: 09SEP2021 16:22:04 38.6N 119.4W ml=2.1 EMSC CENTRAL CALIFORNIA
O: 10SEP2021 02:29:58 38.6N 119.4W Md=2.2 EMSC CENTRAL CALIFORNIA
O: 9SEP2021 14:27:53 38.6N 119.4W ML=3.1 EMSC CENTRAL CALIFORNIA
O: 9SEP2021 14:27:53 38.6N 119.4W ML=3.3 ANSS CENTRAL CALIFORNIA
P: 4SEP2021 136801 38.3N 119.3W 2.5-4.5 BAAAA California/Nevada area
NEIC reported this earthquake of M 3.3 in Central California was felt with intensity II-III in the area(s) of Central California at Coleville and in Glenbrook, Nevada.
O: 9SEP2021 16:42:19 38.8N 122.8W Md=2.4 EMSC NORTHERN CALIFORNIA
P: 7SEP2021 136807 39.0N 123.1W 2.5-4.4 AAAAA Central California
O: 9SEP2021 21:57:52 40.3N 124.7W Mw=4.3 EMSC OFFSHORE NORTHERN CALIFORNIA
O: 10SEP2021 00:03:53 40.3N 124.4W Md=2.2 EMSC OFFSHORE NORTHERN CALIFORNIA
P: 8SEP2021 136873 40.7N 124.6W 2.5-4.4 AAAAA Off Coast of No. Calif
ALASKA
O: 9SEP2021 23:44:02 51.7N 175.1W ML=3.6 EMSC ANDREANOF ISLANDS, ALEUTIAN IS
P: 9SEP2021 136894 51.3N 176.8W 3.5-5.0 AAAAA Andreanoff Isls, Aleutians
O: 9SEP2021 19:23:26 53.6N 163.6W mb=5.1 EMSC UNIMAK ISLAND REGION, ALASKA
O: 10SEP2021 05:57:54 53.2N 163.4W mb=4.0 EMSC UNIMAK ISLAND REGION, ALASKA
P: 2SEP2021 136908 54.6N 163.6W 3.5-5.0 CAAAA Unimak Islands, Aleutians
P: 6SEP2021 136908 54.0N 164.9W 3.5-5.1 BAAAA Unimak Islands, Aleutians
O: 9SEP2021 10:19:00 58.0N 156.3W ML=3.1 EMSC ALASKA PENINSULA
P: 7SEP2021 136912 60.1N 153.4W 3.2-5.2 ACBAA Central Alaska
O: 9SEP2021 07:33:14 60.1N 140.2W ML=3.0 EMSC SOUTHERN YUKON TERRITORY, CANA
P: 5SEP2021 136907 59.0N 139.0W 3.0-4.6 BBAAA Southeast Alaska
O: 10SEP2021 05:31:49 60.3N 151.8W ML=3.5 EMSC KENAI PENINSULA, ALASKA
P: 8SEP2021 136912 61.3N 150.9W 3.2-5.3 AAAAA Central Alaska
O: 10SEP2021 01:26:42 61.6N 146.5W ML=3.5 EMSC SOUTHERN ALASKA
P: 4SEP2021 136913 61.4N 146.5W 3.2-4.9 CAAAA Central Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 09SEP2021 21:41:54 44.1N 128.7W ML=3.2 EMSC OFF COAST OF OREGON
O: 9SEP2021 18:58:03 43.6N 128.0W ML=2.8 EMSC OFF COAST OF OREGON
P: 6SEP2021 136875 44.4N 129.3W 3.0-4.8 BAAAA Off Coast of Oregon
P: 7SEP2021 136874 41.8N 126.9W 2.5-4.8 ABAAA Off Coast of No. Calif
O: 9SEP2021 22:52:28 48.0N 122.1W Md=2.4 EMSC SEATTLE-TACOMA AREA, WASHINGTO
P: 5SEP2021 136888 48.0N 123.0W 2.0-4.4 BAAAA Washington state, U.S.
P: 7SEP2021 136888 49.0N 123.0W 2.0-4.4 AAAAA Washington state, U.S.
ROCKY MOUNTAINS REGION
O: 9SEP2021 14:47:54 31.9N 103.4W mb=2.5 EMSC WESTERN TEXAS
P: 6SEP2021 136827 31.6N 103.6W 2.0-3.9 BAAAA SW U.S.A
O: 09SEP2021 19:19:28 44.2N 114.3W Ml=2.4 EMSC SOUTHERN IDAHO
O: 9SEP2021 17:02:36 44.3N 115.2W Ml=2.1 EMSC SOUTHERN IDAHO
P: 7SEP2021 136862 44.4N 115.2W 2.0-4.0 AAAAA Montana/Idaho
EASTERN U.S./CANADA
O: 09SEP2021 13:37:56 47.4N 70.2W MB=2.8 ECAN La Pocatiere, QC. Felt
O: 08SEP2021 12:05:42 47.4N 70.4W MB=0.9 ECAN Charlevoix Seismic Zone
O: 9SEP2021 13:37:55 47.4N 70.2W ML=2.4 EMSC ST. LAWRENCE VALLEY REG., CANA
P: 9SEP2021 136860 47.0N 70.0W 2.0-4.1 AAAAA Maine
O: 10SEP2021 08:22:30 72.0N 75.1W MB=3.4 ECAN Pond Inlet, NU
O: 9SEP2021 21:33:14 48.3N 69.3W MB=2.0 ECAN Les Escoumins, QC
P: 9SEP2021 136860 47.0N 70.0W 2.0-4.1 ABAAA Maine
O: 9SEP2021 21:22:14 49.6N 67.0W MB=1.5 ECAN Port-Cartier, QC
P: 9SEP2021 136860 47.0N 70.0W 2.0-4.1 ACBAA Maine
HAWAII
No earthquakes of M>=3 were located in Hawaii.
STRONG EARTHQUAKE IN MEXICO OCCURS ON 4TH ANNIVERSARY OF MEXICO M 8.1 SEPT 8, 2017
EARTHQUAKE SUMMARY FOR SEPTEMBER 8, 2021
Aftershocks of the M 7.0-7.1 earthquake in the Guerrero area of Mexico of September 8, 2021 continued today. An interesting phenomenon was observed with the mainshock. Strong earthquake lights accompanied the event and were recorded as far as Mexico City. Some of these recordings can be viewed on the web. The cause of earthquake lights is not known but many hypotheses have been proposed but the relation with strong geomagnetic storms and accompanying aurora is especially in the current situation as such a storm within an hour or two of the time of the M 7.0 in Mexico today. Videos of the lights appeared similar to aurora and to heat lightning. The blue lights followed the earthquake and were viewed with alarm by local citizens. Such lights often accompany major earthquakes in subduction zones such as in Japan and Mexico and often coincide with strong geomagnetic storms. Power outages occurred in Acapulco and Mexico City allowing better viewing of the earthquake lights. The strongest aftershock today was an M 4.6. It was reported felt with intensity II in Tlalnepantla, Mexico.
The second strongest geomagnetic storm in the past four months hit mid-latitudes at the end of September 7 and early September 8. This reached maximum strength near 01:00 UT (SWPC data) and reached high latitude AP of 6 in mid-day starting around 02:00 UT. This storm may have triggered the M 7.0 mainshock about 02:00 UT in Guerrero, Mexico. It may also have helped trigger the earthquake lights at the same time. This geomagnetic storm is described in this summary as:
"The geomagnetic field saw disturbed conditions today. The AP level was 14. High latitude geomagnetic field also saw minor storm conditions with AP 33. The last geomagnetic storm of larger intensity occurred on August 28, 2021 and the second strongest at mid and high latitudes since late May, 2021. Seismicity at low latitudes, near the geomagnetic equator and at high latitudes is likely to be enhanced in the next several days due to this storm." (September 8, 2021)
The relation between the new moon and strong geomagnetic storms in the region of Mexico had been discussed in previous issues of this summary as for example with an M 7.4 in Oaxaca on June 23, 2020:
"The new moon arrived June 21 (2020) at 06:41 UT. ... Longitudes which are sub-solar at this time are near 77 East and 103 West. These include areas of central Asia including Hindu Kush, India and Tajikistan in the east and the central and western U.S. and western Mexico in the west. These will experience the maximum tidal stresses and are most likely to see tidally triggered seismicity at this time. Many area, especially those where fluids are important modulators of seismicity, can experience tidal enhancement of seismicity, and several large earthquakes are likely in the next eight days. Tidal triggering often occurs near local solar midnight and noon when alignment is most linear." (June 18-22, 2020)
The last major event in eastern or central Mexico of M>=7.4 on September 8, 2017, while primarily triggered by a strong geomagnetic excursion, occurred two days after the full moon, much as occurred in the current situation. Previous major quakes in the area have also coincided with full and new moons suggesting strong tidal triggering in the region as detailed below:
"The full moon will arrive on September 6 (2017) at 07:03 UT. Longitudes which are antisolar at this time (local solar midnight) are near 110 West while those which are subsolar (local solar noon) are near 70 East longitude. These include areas of the Rocky Mountains and western Mexico in the west and central Asia in the east. It is in these regions where the highest probability of tidal triggering exists for the next week." (September 8, 2017)
Likewise the event of March 30, 2012 of M 7.4 to the west of today's epicenter was also associated with the new moon. At the time this summary noted this as:
"This could have been finalized by the tidal effects of the new moon alignment which is complete tomorrow. Activity near Tokyo, Japan is at exactly 103 degrees from the Oaxaca epicenter. This area may see enhanced seismicity in the coming days due to this relation. The Oaxaca event is also at 103-104 degrees from an M 5.6 in South Island, New Zealand which occurred several hours earlier and at 104 degrees from Crete" (March 20, 2012)
Likewise an M 7.2 on February 16, 2018, the last such quake in central Mexico of M>=7 occurred, the new moon was complete the day before as noted in this summary at the time:
"The new moon arrived on February 15 (2018) at 21:05 UT." (February 16-17. 2018)
It is not coincidental that the last great earthquake in Mexico occurred exactly four years ago on September 8, 2017. Similar weather and geomagnetic conditions at the time of that M 8.1 in eastern Mexico to those current in the region had been discussed at the time i this summary in part as:
"several factors including the X9.3 solar flare yesterday, tidal stresses and the severe geomagnetic storms. It occurred within about an hour of local solar midnight, a time when these effects maximize. It is also directly west of Hurricane Irma. Stresses on land associated with Irma probably were the major promotional effect triggering this earthquake" (September 8, 2017)
Forecasts 136767 had expected today's activity within about 25 km was likely around September 4-7.
O: 08SEP2021 09:26:48 16.7N 99.7W ML=4.2 EMSC GUERRERO, MEXICO
O: 08SEP2021 11:11:54 16.7N 99.8W ML=4.0 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 20:01:19 16.7N 99.7W ML=4.0 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 12:20:07 16.8N 99.8W ML=4.5 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 13:18:44 16.8N 100.0W ML=4.1 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 13:28:09 16.8N 99.8W ML=4.1 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 23:08:49 16.8N 99.8W ML=4.0 EMSC GUERRERO, MEXICO
O: 08SEP2021 09:50:20 16.9N 99.8W mb=4.6 EMSC GUERRERO, MEXICO
O: 8SEP2021 09:34:11 16.6N 99.6W ML=4.3 EMSC OFFSHORE GUERRERO, MEXICO
P: 4SEP2021 136767 17.0N 100.0W 3.5-5.5 BAAAA Oaxaca, Mexico
P: 7SEP2021 136767 18.0N 100.0W 3.5-5.5 ABAAA Oaxaca, Mexico
Moderate earthquakes in the South Sandwich Islands aftershock sequence also continued today. The strongest of these was an M 5.6 and none were reported felt. This is normal seismicity in this active aftershock area at this time. The M 5.6 occurred near local solar midnight and may have been promoted by strong tidal stresses associated with yesterday's new moon as noted in this and previous issues of this summary:
"The new moon arrived at 00:52 UT on September 7, 2021. Longitudes which were near local solar midnight at this time are in the Atlantic Ocean and western Europe near 15 West and include areas of the Central Mid-Atlantic and the South Sandwich Islands while those at local solar noon are near 165 East and include areas of the northern Kurils and the Sea of Okhotsk, Near Islands and western Aleutians as well as the Vanuatu/Loyalty Islands, Kermadec-Tonga-Fiji-New Zealand arc. These areas will see maximum tidal stresses with this new moon and are most likely to see enhanced seismicity in the next week." (September 6-9, 2021)
Forecast 136964 had expected today's activity within about 50 km was likely around September 7.
O: 09SEP2021 03:47:10 58.7S 25.2W Mw=5.6 EMSC SOUTH SANDWICH ISLANDS REGION
O: 09SEP2021 04:37:00 58.7S 25.0W mb=5.1 EMSC SOUTH SANDWICH ISLANDS REGION
O: 09SEP2021 03:54:18 58.8S 25.4W mb=5.0 EMSC SOUTH SANDWICH ISLANDS REGION
O: 8SEP2021 21:42:18 58.4S 25.5W mb=4.7 EMSC SOUTH SANDWICH ISLANDS REGION
P: 7SEP2021 136964 59.0S 26.0W 4.0-5.6 AAAAA So. Sandwich Islands
A strong series of events also hit the West Chile Rise in the Pacific Ocean today and included events of M 5.6, 5.4, 5.3 and 5.2. The largest of these occurred near local solar noon and may have been promoted by tidal effects with the new moon, but energy from the M 7.0 in Mexico may also have enhanced this activity. This is the strongest activity within about 200 km on the West Chile Rise in more than 10 years - following an M 5.9 about 200 km southeast of this on May 20, 2010 and an M 6.0 to the east on June 5, 2008. Forecast 136956 had expected today's activity was likely to the southeast in the Chile Rise around September 7. This activity is at the sixth node from the M 7.2 in Haiti of August 14 and may have been promoted by energy from that source.
O: 09SEP2021 03:08:20 38.1S 94.0W mb=4.6 EMSC WEST CHILE RISE
O: 08SEP2021 15:33:58 38.2S 93.9W mb=4.9 EMSC WEST CHILE RISE
O: 08SEP2021 15:37:17 38.2S 93.9W mb=4.6 EMSC WEST CHILE RISE
O: 08SEP2021 16:37:27 38.2S 93.9W Mw=5.6 EMSC WEST CHILE RISE
O: 08SEP2021 23:13:47 38.2S 94.0W Mw=5.3 EMSC WEST CHILE RISE
O: 08SEP2021 23:48:44 38.2S 93.9W Mw=5.4 EMSC WEST CHILE RISE
O: 08SEP2021 21:17:33 38.3S 93.7W mb=4.9 EMSC WEST CHILE RISE
O: 09SEP2021 01:12:10 38.3S 93.9W mb=4.8 EMSC WEST CHILE RISE
O: 09SEP2021 01:43:33 38.3S 93.9W mb=4.6 EMSC WEST CHILE RISE
O: 09SEP2021 06:42:48 38.3S 93.7W mb=5.2 EMSC WEST CHILE RISE
O: 8SEP2021 10:33:14 36.3S 98.1W mb=4.6 EMSC SOUTHEAST OF EASTER ISLAND
O: 8SEP2021 21:56:48 38.1S 93.9W mb=4.7 EMSC WEST CHILE RISE
P: 7SEP2021 136956 41.0S 91.0W 4.0-5.6 ACBAA Chile Rise
Seismicity in the Yellowstone National Park area of Wyoming was enhanced today. A pair of earthquakes of M 3.0 each was recorded. This is the strongest activity in Yellowstone since an M 3.6 on July 17, 2021. It occurred near local solar noon and may have been promoted by energy from the M 7.0 in Mexico or geomagnetic or tidal stresses. Forecast 136889 had expected today's activity in Yellowstone was likely around September 10.
O: 08SEP2021 17:18:06 44.2N 110.8W Md=2.3 EMSC YELLOWSTONE NAT. PARK, WYOMING
O: 08SEP2021 18:00:12 44.2N 110.8W ML=3.0 EMSC YELLOWSTONE NAT. PARK, WYOMING
O: 8SEP2021 17:01:33 44.2N 110.8W ML=3.0 EMSC YELLOWSTONE NAT. PARK, WYOMING
P: 10SEP2021 136889 44.6N 110.8W 2.0-4.2 AAAAA Yellowstone/Wyoming
A series of earthquakes north of Mexico in Western Texas was also energized today. The strongest of these was an M 4.2 but the swarm began near local solar midnight about 6 hours after the M 7.0 in Mexico and may have been promoted from Mexico or by tidal and geomagnetic stresses. An M 4.2 last occurred in this area on September 3 and is among the four largest such events in the region in the past year. Many of these have occurred at full or new moons and appear tidally related. Forecast 136829 had expected today's activity was likely around September 6.
NEIC reported this earthquake of M 4.2 in Western Texas was felt with intensity II-III in the area(s) of Carlsbad, New Mexico. An earlier event of M 2.6 was felt in western Texas with intensity II.
O: 08SEP2021 07:28:24 31.7N 104.4W ML=2.8 EMSC WESTERN TEXAS
O: 08SEP2021 08:50:22 31.7N 104.4W ML=2.0 EMSC WESTERN TEXAS
O: 08SEP2021 11:22:16 31.7N 104.4W ML=2.5 EMSC WESTERN TEXAS
O: 08SEP2021 12:05:56 31.7N 104.4W ML=2.2 EMSC WESTERN TEXAS
O: 08SEP2021 22:02:05 31.7N 104.4W Mw=4.0 EMSC WESTERN TEXAS
O: 08SEP2021 22:02:05 31.7N 104.4W Mw=4.2 ANSS WESTERN TEXAS
O: 8SEP2021 13:44:41 31.6N 104.2W ML=2.4 EMSC WESTERN TEXAS
O: 8SEP2021 13:44:41 31.6N 104.2W ML=2.4 EMSC WESTERN TEXAS
P: 6SEP2021 136827 31.6N 103.6W 2.0-3.9 AAAAA SW U.S.A
Another moderately strong event of M 5.8 also occurred in the Tonga/Fiji area today - the third such event in the area in the past three days. Forecast 136944 had expected this event within about 150 km was likely around September 8. It occurred near the geomagnetic equator and may have been promoted by the strong geomagnetic storm today.
O: 9SEP2021 04:59:43 19.2S 176.5W Mw=5.8 EMSC FIJI REGION
P: 8SEP2021 136944 20.0S 175.0W 4.0-5.7 AABAA Tonga Islands
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: 8SEP2021 15:43:00 34.8N 45.0E mb=4.6 EMSC IRAQ
P: 5SEP2021 136840 33.0N 46.0E 3.8-5.5 BBAAA So. Iran
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 8SEP2021 12:56:25 0.4S 123.1E ML=4.5 EMSC SULAWESI, INDONESIA
P: 5SEP2021 136719 0.0N 123.0E 4.0-5.5 BAAAA Mindanao, Philippines
O: 8SEP2021 07:58:25 3.3N 96.2E ML=4.6 EMSC NORTHERN SUMATRA, INDONESIA
P: 2SEP2021 136721 4.0N 93.0E 4.0-5.4 CACAA Nicobar Islands
P: 10SEP2021 136720 0.0N 97.0E 4.0-5.4 ACAAA Nicobar Islands
O: 9SEP2021 02:16:32 4.0S 135.0E mb=5.0 EMSC PAPUA, INDONESIA
P: 6SEP2021 136742 4.0S 135.0E 4.0-5.6 BAAAA West Irian, PNG
O: 9SEP2021 05:18:01 5.0S 102.4E ML=4.0 EMSC SOUTHERN SUMATRA, INDONESIA
P: 10SEP2021 136739 2.0S 101.0E 4.0-5.6 ACBAA So. of Sumatera
O: 08SEP2021 08:44:39 6.2N 126.8E ML=4.8 EMSC MINDANAO, PHILIPPINES
O: 9SEP2021 05:19:52 5.9N 126.2E mb=4.5 EMSC MINDANAO, PHILIPPINES
P: 10SEP2021 136718 7.0N 127.0E 4.0-5.4 ABAAA Halmahera
O: 8SEP2021 15:36:57 9.0S 118.9E ML=4.0 EMSC SUMBAWA REGION, INDONESIA
P: 7SEP2021 136931 11.0S 116.0E 4.0-5.6 ABCAA So. of Indonesia
O: 9SEP2021 06:55:13 9.8S 120.7E ML=4.6 EMSC SUMBA REGION, INDONESIA
P: 3SEP2021 136729 7.0S 120.0E 4.0-5.5 CCAAA Flores Island area
O: 9SEP2021 03:02:24 10.1N 93.8E mb=4.7 EMSC ANDAMAN ISLANDS, INDIA REGION
P: 7SEP2021 136743 11.0N 95.0E 4.0-5.6 AAAAA Andaman Islands
O: 9SEP2021 03:25:29 10.5S 113.3E ML=4.1 EMSC SOUTH OF JAVA, INDONESIA
P: 7SEP2021 136931 11.0S 116.0E 4.0-5.6 AACAA So. of Indonesia
CENTRAL AND SOUTH AMERICA
O: 9SEP2021 01:14:22 6.9S 72.8W mb=4.8 EMSC AMAZONAS, BRAZIL
P: 5SEP2021 136735 6.0S 76.0W 4.0-5.8 BACAA No. Peru
NEIC reported this earthquake of M 4.8 in Amazonas, Brazil was felt with intensity II-III in the area(s) of Amazonas, Brazil at Cruzeiro do Sol, Acre.
O: 9SEP2021 04:27:33 9.1N 83.9W mb=4.4 EMSC COSTA RICA
P: 8SEP2021 136717 9.0N 84.0W 3.5-5.1 AAAAA Costa Rica
NEIC reported this earthquake of M 4.4 in Costa Rica was felt with intensity II-III in the area(s) of Costa Rica in Palmares. Alajuela and San Isidro, San Jose.
O: 9SEP2021 06:02:51 17.9N 67.0W ML=3.1 EMSC PUERTO RICO REGION
P: 6SEP2021 136768 18.0N 67.0W 3.4-5.4 BAAAA Puerto Rico
O: 8SEP2021 12:05:28 18.5N 106.7W mb=4.3 EMSC OFF COAST OF JALISCO, MEXICO
P: 4SEP2021 136749 18.0N 106.0W 3.5-5.7 BAAAA Coast of Jalisco, Mexico
O: 8SEP2021 19:50:29 19.6N 71.6W ML=3.4 EMSC DOMINICAN REPUBLIC
P: 5SEP2021 136771 19.0N 71.0W 3.4-5.3 BAAAA Puerto Rico
O: 8SEP2021 10:11:13 21.7S 68.4W mb=4.1 EMSC ANTOFAGASTA, CHILE
P: 6SEP2021 136935 21.0S 68.0W 4.0-5.8 AAAAA Argentina
O: 08SEP2021 14:48:57 16.8N 95.2W ML=4.0 EMSC OAXACA, MEXICO
O: 8SEP2021 07:33:07 16.4N 94.5W ML=4.2 EMSC OAXACA, MEXICO
P: 7SEP2021 136747 16.0N 95.0W 3.5-5.1 AAAAA Chiapas, Mexico
O: 08SEP2021 09:26:48 16.7N 99.7W ML=4.2 EMSC GUERRERO, MEXICO
O: 08SEP2021 11:11:54 16.7N 99.8W ML=4.0 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 20:01:19 16.7N 99.7W ML=4.0 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 12:20:07 16.8N 99.8W ML=4.5 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 13:18:44 16.8N 100.0W ML=4.1 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 13:28:09 16.8N 99.8W ML=4.1 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 23:08:49 16.8N 99.8W ML=4.0 EMSC GUERRERO, MEXICO
O: 08SEP2021 09:50:20 16.9N 99.8W mb=4.6 EMSC GUERRERO, MEXICO
O: 8SEP2021 09:34:11 16.6N 99.6W ML=4.3 EMSC OFFSHORE GUERRERO, MEXICO
P: 4SEP2021 136767 17.0N 100.0W 3.5-5.5 BAAAA Oaxaca, Mexico
P: 7SEP2021 136767 18.0N 100.0W 3.5-5.5 ABAAA Oaxaca, Mexico
O: 08SEP2021 08:41:41 18.5N 73.9W ML=3.3 EMSC HAITI REGION
O: 8SEP2021 10:08:11 18.4N 73.6W ML=3.3 EMSC HAITI REGION
AFRICA AND EUROPE
O: 8SEP2021 11:28:38 44.3N 17.9E mb=4.3 EMSC BOSNIA AND HERZEGOVINA
P: 8SEP2021 136852 43.0N 18.0E 3.0-5.3 ABAAA Adriatic Sea
NEIC reported this earthquake of M 4.3 in Bosnia and Herzegovina was felt with intensity II-III in the area(s) of Bosnia and Herzegovina at Vitez Federacja (IV), Bosovaca, Zavidovici, Kobilja Glava, Sarajevo, Listica and in Backa Topola, Servia and Montenegro.
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 9SEP2021 00:51:40 18.2S 177.9W mb=4.3 EMSC FIJI REGION
P: 8SEP2021 136932 18.0S 178.0W 4.0-5.8 AAAAA Tonga Islands
O: 9SEP2021 04:59:43 19.2S 176.5W Mw=5.8 EMSC FIJI REGION
P: 8SEP2021 136944 20.0S 175.0W 4.0-5.7 AABAA Tonga Islands
OCEAN RIDGES
O: 9SEP2021 06:40:42 13.0N 57.6E mb=4.6 EMSC OWEN FRACTURE ZONE REGION
P: 1SEP2021 136744 15.0N 57.0E 3.5-5.0 CBAAA Arabian Sea
P: 5SEP2021 136752 15.0N 54.0E 3.5-5.1 BBCAA Gulf of Aden
O: 09SEP2021 03:08:20 38.1S 94.0W mb=4.6 EMSC WEST CHILE RISE
O: 08SEP2021 15:33:58 38.2S 93.9W mb=4.9 EMSC WEST CHILE RISE
O: 08SEP2021 15:37:17 38.2S 93.9W mb=4.6 EMSC WEST CHILE RISE
O: 08SEP2021 16:37:27 38.2S 93.9W Mw=5.6 EMSC WEST CHILE RISE
O: 08SEP2021 23:13:47 38.2S 94.0W Mw=5.3 EMSC WEST CHILE RISE
O: 08SEP2021 23:48:44 38.2S 93.9W Mw=5.4 EMSC WEST CHILE RISE
O: 08SEP2021 21:17:33 38.3S 93.7W mb=4.9 EMSC WEST CHILE RISE
O: 09SEP2021 01:12:10 38.3S 93.9W mb=4.8 EMSC WEST CHILE RISE
O: 09SEP2021 01:43:33 38.3S 93.9W mb=4.6 EMSC WEST CHILE RISE
O: 09SEP2021 06:42:48 38.3S 93.7W mb=5.2 EMSC WEST CHILE RISE
O: 8SEP2021 10:33:14 36.3S 98.1W mb=4.6 EMSC SOUTHEAST OF EASTER ISLAND
O: 8SEP2021 21:56:48 38.1S 93.9W mb=4.7 EMSC WEST CHILE RISE
P: 7SEP2021 136956 41.0S 91.0W 4.0-5.6 ACBAA Chile Rise
O: 09SEP2021 03:47:10 58.7S 25.2W Mw=5.6 EMSC SOUTH SANDWICH ISLANDS REGION
O: 09SEP2021 04:37:00 58.7S 25.0W mb=5.1 EMSC SOUTH SANDWICH ISLANDS REGION
O: 09SEP2021 03:54:18 58.8S 25.4W mb=5.0 EMSC SOUTH SANDWICH ISLANDS REGION
O: 8SEP2021 21:42:18 58.4S 25.5W mb=4.7 EMSC SOUTH SANDWICH ISLANDS REGION
P: 7SEP2021 136964 59.0S 26.0W 4.0-5.6 AAAAA So. Sandwich Islands
ZEALANDIA AND AUSTRALIA REGION
No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia
today. GeoNet did not report any felt events in the area.
JAPAN AND KURIL ISLANDS
O: 9SEP2021 01:32:45 27.9N 139.8E mb=4.2 EMSC BONIN ISLANDS, JAPAN REGION
O: 9SEP2021 04:11:53 29.4N 142.2E Mw=5.4 EMSC IZU ISLANDS, JAPAN REGION
P: 4SEP2021 136776 28.0N 142.0E 4.0-5.6 BBAAA Bonin Islands
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 08SEP2021 21:17:52 32.4N 115.2W ML=2.9 EMSC BAJA CALIFORNIA, MEXICO
O: 8SEP2021 18:19:18 32.3N 115.1W Ml=2.5 EMSC BAJA CALIFORNIA, MEXICO
P: 7SEP2021 136830 32.6N 116.1W 2.5-4.9 AAAAA So. California
O: 8SEP2021 08:37:22 33.2N 115.6W Ml=2.3 EMSC SOUTHERN CALIFORNIA
P: 8SEP2021 136831 33.0N 115.9W 2.5-5.0 AAAAA So. California
O: 8SEP2021 10:22:53 34.0N 117.2W Ml=2.7 EMSC GREATER LOS ANGELES AREA, CALI
P: 6SEP2021 136833 33.7N 117.5W 2.5-4.6 AAAAA So. California
NEIC reported this earthquake of M 2.7 in Southern California was felt with intensity II-III in the area(s) of Southern California at Redlands, Ponoma and Cathedral City.
O: 8SEP2021 19:12:01 35.6N 117.5W Ml=2.2 EMSC SOUTHERN CALIFORNIA
P: 5SEP2021 136836 35.0N 117.7W 2.5-4.4 BAAAA So. California
O: 8SEP2021 20:01:24 36.1N 117.8W Ml=2.5 EMSC CENTRAL CALIFORNIA
P: 9SEP2021 136796 36.1N 118.1W 2.5-4.6 AAAAA California/Nevada area
O: 9SEP2021 01:31:24 36.7N 121.3W Md=2.6 EMSC CENTRAL CALIFORNIA
P: 9SEP2021 136802 36.6N 120.7W 2.5-4.5 AAAAA Central California
NEIC reported this earthquake of M 2.6 in Central California was felt with intensity II-III in the area(s) of Central California at Hollister.
O: 8SEP2021 08:44:25 38.2N 118.0W ml=2.5 EMSC NEVADA
P: 5SEP2021 136800 37.8N 118.2W 2.5-4.6 BAAAA California/Nevada area
O: 8SEP2021 21:42:09 38.3N 116.0W ml=3.3 EMSC NEVADA
P: 5SEP2021 136799 37.8N 115.8W 2.5-4.8 AAAAA California/Nevada area
O: 9SEP2021 03:38:37 38.6N 119.5W ml=2.5 EMSC CENTRAL CALIFORNIA
P: 6SEP2021 136801 38.6N 118.6W 2.5-4.8 BAAAA California/Nevada area
O: 8SEP2021 12:04:44 38.8N 122.8W Md=2.1 EMSC NORTHERN CALIFORNIA
O: 08SEP2021 15:08:36 38.8N 122.8W Md=2.2 EMSC NORTHERN CALIFORNIA
P: 6SEP2021 136806 38.8N 122.8W 2.5-4.5 AAAAA Central California
ALASKA
O: 8SEP2021 19:35:28 55.5N 156.1W ML=3.0 EMSC SOUTH OF ALASKA
P: 6SEP2021 136890 54.7N 157.9W 3.5-5.1 AAAAA Alaska Peninsula
O: 8SEP2021 18:31:13 55.5N 159.6W ML=3.1 EMSC ALASKA PENINSULA
P: 10SEP2021 136908 54.3N 161.4W 3.5-5.1 ABAAA Unimak Islands, Aleutians
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: 08SEP2021 07:28:24 31.7N 104.4W ML=2.8 EMSC WESTERN TEXAS
O: 08SEP2021 08:50:22 31.7N 104.4W ML=2.0 EMSC WESTERN TEXAS
O: 08SEP2021 11:22:16 31.7N 104.4W ML=2.5 EMSC WESTERN TEXAS
O: 08SEP2021 12:05:56 31.7N 104.4W ML=2.2 EMSC WESTERN TEXAS
O: 08SEP2021 22:02:05 31.7N 104.4W Mw=4.0 EMSC WESTERN TEXAS
O: 8SEP2021 13:44:41 31.6N 104.2W ML=2.4 EMSC WESTERN TEXAS
P: 6SEP2021 136827 31.6N 103.6W 2.0-3.9 AAAAA SW U.S.A
O: 8SEP2021 09:10:17 32.1N 102.2W mb=2.6 EMSC WESTERN TEXAS
P: 6SEP2021 136827 31.6N 103.6W 2.0-3.9 AAAAA SW U.S.A
O: 08SEP2021 17:18:06 44.2N 110.8W Md=2.3 EMSC YELLOWSTONE NAT. PARK, WYOMING
O: 08SEP2021 18:00:12 44.2N 110.8W ML=3.0 EMSC YELLOWSTONE NAT. PARK, WYOMING
O: 8SEP2021 17:01:33 44.2N 110.8W ML=3.0 EMSC YELLOWSTONE NAT. PARK, WYOMING
P: 10SEP2021 136889 44.6N 110.8W 2.0-4.2 AAAAA Yellowstone/Wyoming
O: 08SEP2021 15:26:17 44.3N 115.2W Ml=2.2 EMSC SOUTHERN IDAHO
O: 8SEP2021 13:34:28 44.3N 115.2W Ml=2.9 EMSC SOUTHERN IDAHO
P: 7SEP2021 136862 44.4N 115.2W 2.0-4.0 AAAAA Montana/Idaho
NEIC reported this earthquake of M 2.9 in Southern Idaho was felt with intensity II-III in the area(s) of Southern Idaho in Boise.
EASTERN U.S./CANADA
O: 8SEP2021 15:13:57 35.1N 95.3W ML=2.4 EMSC OKLAHOMA
P: 10SEP2021 136842 35.0N 96.0W 2.0-4.1 AAAAA Southern Plains
O: 07SEP2021 13:53:27 72.0N 75.3W MB=3.7 ECAN Pond Inlet, NU
O: 07SEP2021 05:51:29 72.1N 73.1W MB=2.4 ECAN Pond Inlet, NU
O: 7SEP2021 15:01:20 72.0N 75.3W MB=2.0 ECAN Pond Inlet, NU
O: 8SEP2021 06:34:03 49.3N 61.8W MB=2.0 ECAN Natashquan, QC
O: 8SEP2021 02:14:45 44.6N 57.2W MB=4.0 ECAN Louisbourg, NS
O: 7SEP2021 22:46:21 47.2N 76.5W MB=2.3 ECAN Ferme-Neuve, QC
P: 5SEP2021 136868 47.0N 76.0W 2.0-4.3 AAAAA New York State
HAWAII
O: 9SEP2021 04:34:48 19.2N 155.4W ML=3.9 EMSC ISLAND OF HAWAII, HAWAII
O: 9SEP2021 04:34:48 19.2N 155.4W ML=3.5 ANSS ISLAND OF HAWAII, HAWAII
P: 10SEP2021 136779 20.4N 155.1W 4.0-5.6 ABAAA Hawaii area
NEIC reported this earthquake of M 3.5-3.9 in Hawaii was felt with intensity II-III in the area(s) of Hawaii at Hawaii National Park, Naalehu, Volcano, Mountain View, Captain Cook, Holualca, Keelakekua, Honomu, Kailua Kona and Laupahoehoe.
MAJOR EARTHQUAKE DAMAGING, DEADLY IN GUERRERO, MEXICO
EARTHQUAKE SUMMARY FOR SEPTEMBER 7, 2021
A major earthquake of M 7.0 shook the region of Guerrero, Mexico south of Mexico City today. A foreshock of M 4.2 occurred several hours before the mainshock and was felt in Guerrero with IV at Acatlan, Zihuatanejo, Coatepec,Mexico City and II-III in Tlapa, Santos Reys, Oaxaca, Vista Hermosa, Naucalpan, Chautla, Puebla and in Cuernavaca, Morelos, Mexico. NEIC reported the mainshock was felt with maximum intensity VII with slight damage in Guerrero, Mexico at Acapulco, Chipancingo, and VI in El Ocotilo, Tepecoacuillc, Tizapotla and Taxco with IV in Tlapa and Huamuxtitlan and II-III in Xaltianguis and Petatlan and in Mexico City. A number of aftershocks were lightly felt in the Mexico City and Tlalnepantla, Mexico area. Reuters reported at least one person died in the quake when a pole fell on him. The earthquake was centered near Acapulco, Mexico and caused damage as far north as Mexico City with landslides. Tall buildings swayed and cars were crushed by falling debris. A tsunami alert was not issued but minor sea level fluctuations may have occurred. No earthquakes of M>=7 have occurred within about 100 km of today's epicenter in the past 30 ye3ars. Earthquakes within about 250 km of this occurred about 250 km northeast on September 19, 2017 and to the northwest on April 18, 2014. Similar events hit to the east of this on March 20, 2012 (M 7.4); February 25, 1996 (M 7.1) and September 14, 1995 (M 7.4). This earthquake occurred with the new moon and was probably promoted by strong tidal stresses associated with that alignment. This report had expected enhanced seismicity with this new moon in previous issues as:
"The new moon will arrive at 00:52 UT on September 7, 2021. Longitudes which are near local solar midnight at this time are in the Atlantic Ocean and western Europe near 15 West and include areas of the Central Mid-Atlantic and the South Sandwich Islands while those at local solar noon are near 165 East and include areas of the northern Kurils and the Sea of Okhotsk, Near Islands and western Aleutians as well as the Vanuatu/Loyalty Islands, Kermadec-Tonga-Fiji-New Zealand arc. These areas will see maximum tidal stresses with this new moon and are most likely to see enhanced seismicity in the next week." (September 5-6, 2021)
The last major earthquake of M>=7 in the world was an M 7.0 on August 18, 2021 in the Vanuatu Islands. It is located near 100 degrees from both the South Sandwich Islands quake of M 8.1 of August 12 and the Vanuatu earthquake and was probably promoted by energy from those sources.
A Tropical Depression made landfall off the coast of Guerrero, Mexico about the time of the M 7.0. Stresses associated with this storm probably also helped promote seismicity in this region of Mexico at this time as reported in this summary as:
"Tropical Depression 15E formed south of western Mexico today with winds up to 40 kts. This system is expected to track to the north and west and may enhance seismicity in western and central Mexico. The M 7.0 in Guerrero, Mexico today may have been promoted by stresses associated with this storm." (September 6-7, 2021)
A series of moderate earthquakes north of this epicenter has been occurring over the past two days. It is likely that this was precursory to today's event in Guerrero, Mexico. This summary had noted this activity in previous issues as:
"Moderate earthquakes of M 4.3, 4.4 and 4.4 was felt widely in northern and western Mexico in San Luis Potosi and Guanajuato States of Mexico. NEIC reported maximum intensity V in Ahualulco and IV in San Felipe, Zaragoza, Edina and II-III in Escalerillas, San Luis Potosi, Soledad, Leion Jauregui and Juarez. The only other event of M>=4.4 within about 250 km of this epicenter in the past 30 years was an M 4.4 about 250 km north of this on June 4, 2004. This series began yesterday with an M 4.3 and an M 4.1. These events are located at 103 degrees from the South Sandwich Islands M 8.1 of August 12 and were probably promoted from that source. Forecast 136767 had expected enhanced seismicity south of this around September 7." (September 6-7, 2021)
The forecast noted here referenced a possible moderate to strong quake about
100 km north of today's Mexico quake as:
O: 05SEP2021 11:07:43 21.7N 101.0W ML=4.3 EMSC GUANAJUATO, MEXICO
O: 06SEP2021 04:49:49 21.7N 101.1W ML=4.4 EMSC GUANAJUATO, MEXICO
O: 6SEP2021 02:31:16 21.6N 100.9W mb=4.4 EMSC GUANAJUATO, MEXICO
O: 7SEP2021 08:49:02 21.7N 101.0W ML=3.8 EMSC GUANAJUATO, MEXICO
P: 6SEP2021 136760 18.0N 102.0W 3.5-5.4 ACAAA Michoacan, Mexico
P: 7SEP2021 136767 18.0N 100.0W 3.5-5.5 ACAAA Oaxaca, Mexico
Forecast 136767 had expected today's activity was likely within about 25 km of the mainshock between September 4 and 8.
O: 08SEP2021 03:50:47 16.8N 99.8W ML=4.1 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 02:41:55 16.9N 99.9W ML=4.3 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 02:41:55 16.9N 99.9W ML=4.3 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 03:30:20 16.9N 99.9W ML=4.2 EMSC GUERRERO, MEXICO
O: 08SEP2021 04:17:50 16.9N 99.9W ML=4.2 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 04:24:15 16.9N 99.8W ML=4.2 EMSC GUERRERO, MEXICO
O: 08SEP2021 02:18:02 17.0N 99.8W mb=4.9 EMSC GUERRERO, MEXICO
O: 08SEP2021 00:55:24 17.1N 99.4W mb=4.2 EMSC GUERRERO, MEXICO
O: 08SEP2021 02:58:20 17.1N 99.8W mb=4.7 EMSC GUERRERO, MEXICO
O: 8SEP2021 03:53:33 16.0N 98.4W ML=4.1 EMSC OFFSHORE OAXACA, MEXICO
O: 8SEP2021 05:43:05 17.1N 99.7W mb=4.5 EMSC GUERRERO, MEXICO
O: 08SEP2021 01:47:46 17.0N 99.8W Mw=7.0 EMSC GUERRERO, MEXICO
P: 4SEP2021 136767 17.0N 100.0W 3.5-5.5 BAAAA Oaxaca, Mexico
P: 7SEP2021 136767 18.0N 100.0W 3.5-5.5 AAAAA Oaxaca, Mexico
An earthquake of M 5.3-5.5 north of Afghanistan was felt in Tajikistan today in Murgob Gorno-Badakhshan and Dushanbe with intensity V and II respectively. It was also reported felt with intensity II in Faizabad, Afghanistan. This is the strongest in a series of moderate earthquake in the region which began in late August and has included nine moderate quakes of M>=4 including those of M 5.0 in the Hindu Kush, Afghanistan on September 2 and August 30. An earthquake of M 5.9 hit this area on February 12, 2021 and this is probably an aftershock of that earthquake. Similar quakes hit the area on Jun 16 and January 24, 2020. Today's event is located at 103 degrees from the M 7.0 in Vanuatu of August 18 and was probably promoted by energy from that source. This summary noted this swarm previously as:
"A moderate earthquake of M 5.0 in Afghanistan today continued moderate seismicity in that region which has been occurring over the past several days. This summary noted this in previous issues as:
"An unusual earthquake of M 4.5 occurred today in Central Afghanistan, accompanying the major geomagnetic storm today. This epicenter is located in the mountains west of Kabul, Afghanistan. The last earthquake within about 250 km of this epicenter in Afghanistan was an M 5.0 and 4.7 aftershock on January 15, 2007." (August 27-28, 2021)
Two earthquakes of larger magnitude have occurred within about 200 km of this epicenter in Afghanistan in the past year - an M 5.5 on January 16, 2021 and an M 5.2 on August 15." (August 30-31, 2021)
Forecast 136812 had expected today's activity within about 100 km was likely around September 6.
O: 07SEP2021 13:34:13 38.2N 73.3E mb=4.7 EMSC TAJIKISTAN
O: 8SEP2021 05:20:02 38.2N 73.2E mb=5.5 EMSC TAJIKISTAN
P: 6SEP2021 136812 39.0N 72.0E 3.8-5.3 AAAAA Hindu Kush/Pakistan
A strong earthquake of M 6.0 was also felt in the area of Tonga/Fiji today. NEIC reported maximum intensity V in Nuku'alofa and II-III in Suva, and Navua, Central Fiji and in Apia, Samoa. The last shallow focus earthquake of M>=6 within about 200 km of today's epicenter was an M 6.4 on Octgober 1, 2020 and an M 6.1 on November 11, 2019. Forecast 136944 had expected today's activity within about 100 km was likely around September 8.
O: 7SEP2021 09:49:57 19.4S 176.1W Mw=5.8 EMSC FIJI REGION
O: 7SEP2021 09:49:57 19.4S 176.1W Mw=6.0 ANSS FIJI REGION
P: 8SEP2021 136944 20.0S 175.0W 4.0-5.7 AAAAA Tonga Islands
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: 7SEP2021 16:19:11 24.5N 122.0E ML=4.3 TAI Hualien, Taiwan
P: 6SEP2021 136787 25.0N 122.0E 4.0-5.5 AAAAA Ryukyu Islands
CWB reported this earthquake was felt with intensity II in Hualien and Yilan and I in Taipei and Taoyuan Counties, Taiwan.
O: 07SEP2021 13:34:13 38.2N 73.3E mb=4.7 EMSC TAJIKISTAN
O: 8SEP2021 05:20:02 38.2N 73.2E mb=5.5 EMSC TAJIKISTAN
P: 6SEP2021 136812 39.0N 72.0E 3.8-5.3 AAAAA Hindu Kush/Pakistan
O: 7SEP2021 16:50:33 48.6N 106.1E mb=4.4 EMSC CENTRAL MONGOLIA
P: 2SEP2021 136906 50.0N 113.0E 3.0-4.5 BBCAA So. Siberia
NEIC reported this earthquake of M 4.4 in Central Mongolia was felt with intensity IV-V in the area(s) of Central Mongolia at Zuunharaa, Zuumod, Nalajh and in Ulaanbaatar.
O: 8SEP2021 02:28:33 55.5N 166.4E mb=4.9 EMSC KOMANDORSKIYE OSTROVA REGION
P: 7SEP2021 136900 55.0N 166.0E 4.0-6.0 AAAAA Komandorsky Isl
INDONESIA AND PHILIPPINES
O: 7SEP2021 08:53:19 3.2S 102.4E ML=4.6 EMSC SOUTHERN SUMATRA, INDONESIA
P: 10SEP2021 136739 2.0S 101.0E 4.0-5.6 BBBAA So. of Sumatera
O: 7SEP2021 14:00:18 4.7N 127.0E ML=4.5 EMSC KEPULAUAN TALAUD, INDONESIA
P: 29AUG2021 136439 5.0N 127.0E 4.0-5.4 CAAAA Halmahera
O: 8SEP2021 05:15:17 6.0N 126.9E ML=4.5 EMSC MINDANAO, PHILIPPINES
P: 10SEP2021 136718 7.0N 127.0E 4.0-5.4 AAAAA Halmahera
O: 8SEP2021 00:13:00 7.5S 128.4E mb=4.6 EMSC KEPULAUAN BARAT DAYA, INDONESI
P: 9SEP2021 136724 7.0S 128.0E 4.0-5.4 AAAAA Banda Sea
O: 7SEP2021 18:29:22 8.3N 126.6E mb=4.6 EMSC MINDANAO, PHILIPPINES
P: 10SEP2021 136718 7.0N 127.0E 4.0-5.4 BBAAA Halmahera
O: 8SEP2021 01:33:28 18.7N 145.8E mb=4.6 EMSC PAGAN REG., N. MARIANA ISLANDS
P: 4SEP2021 136764 18.0N 145.0E 4.0-5.4 BAAAA No. Marianas
No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.
CENTRAL AND SOUTH AMERICA
O: 08SEP2021 03:50:47 16.8N 99.8W ML=4.1 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 02:41:55 16.9N 99.9W ML=4.3 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 02:41:55 16.9N 99.9W ML=4.3 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 03:30:20 16.9N 99.9W ML=4.2 EMSC GUERRERO, MEXICO
O: 08SEP2021 04:17:50 16.9N 99.9W ML=4.2 EMSC OFFSHORE GUERRERO, MEXICO
O: 08SEP2021 04:24:15 16.9N 99.8W ML=4.2 EMSC GUERRERO, MEXICO
O: 08SEP2021 01:47:46 17.0N 99.8W Mw=7.0 EMSC GUERRERO, MEXICO
O: 08SEP2021 02:18:02 17.0N 99.8W mb=4.9 EMSC GUERRERO, MEXICO
O: 08SEP2021 00:55:24 17.1N 99.4W mb=4.2 EMSC GUERRERO, MEXICO
O: 08SEP2021 02:58:20 17.1N 99.8W mb=4.7 EMSC GUERRERO, MEXICO
O: 8SEP2021 03:53:33 16.0N 98.4W ML=4.1 EMSC OFFSHORE OAXACA, MEXICO
O: 8SEP2021 05:43:05 17.1N 99.7W mb=4.5 EMSC GUERRERO, MEXICO
P: 4SEP2021 136767 17.0N 100.0W 3.5-5.5 BAAAA Oaxaca, Mexico
P: 7SEP2021 136767 18.0N 100.0W 3.5-5.5 AAAAA Oaxaca, Mexico
O: 8SEP2021 02:00:50 13.2N 89.8W ML=4.6 EMSC OFFSHORE EL SALVADOR
P: 7SEP2021 136751 14.0N 90.0W 3.5-5.3 AAAAA Guatemala
O: 7SEP2021 21:21:32 15.5N 95.4W ML=4.2 EMSC OFFSHORE OAXACA, MEXICO
P: 7SEP2021 136747 16.0N 95.0W 3.5-5.1 AAAAA Chiapas, Mexico
O: 7SEP2021 13:22:14 17.4S 69.4W mb=4.5 EMSC LA PAZ, BOLIVIA
P: 8SEP2021 136929 17.0S 70.0W 4.0-5.6 AAAAA So. Peru/Bolivia
O: 07SEP2021 17:28:14 19.1N 66.5W Md=3.2 EMSC PUERTO RICO REGION
O: 7SEP2021 09:18:59 18.3N 66.1W Md=3.2 EMSC PUERTO RICO
P: 6SEP2021 136768 18.0N 67.0W 3.4-5.4 AAAAA Puerto Rico
O: 7SEP2021 21:26:24 18.4N 68.6W ML=3.0 EMSC DOMINICAN REPUBLIC
P: 6SEP2021 136770 19.0N 69.0W 3.4-5.3 AAAAA Puerto Rico
O: 07SEP2021 10:13:51 18.9N 67.6W Md=3.1 EMSC PUERTO RICO REGION
O: 8SEP2021 05:59:03 19.0N 67.5W Md=3.3 EMSC PUERTO RICO REGION
P: 6SEP2021 136768 18.0N 67.0W 3.4-5.4 AAAAA Puerto Rico
O: 7SEP2021 08:49:02 21.7N 101.0W ML=3.8 EMSC GUANAJUATO, MEXICO
P: 6SEP2021 136760 18.0N 102.0W 3.5-5.4 ACAAA Michoacan, Mexico
O: 7SEP2021 23:57:57 24.3S 67.3W mb=4.1 EMSC SALTA, ARGENTINA
P: 4SEP2021 136935 24.0S 64.0W 4.0-5.4 BACAA Argentina
O: 7SEP2021 14:24:00 38.0S 74.2W mb=4.4 EMSC OFFSHORE BIO-BIO, CHILE
P: 9SEP2021 136949 39.0S 73.0W 4.0-5.8 AAAAA Central Chile
AFRICA AND EUROPE
O: 7SEP2021 11:15:01 36.1N 31.0E mb=4.5 EMSC WESTERN TURKEY
P: 7SEP2021 136845 38.0N 30.0E 3.5-5.1 ABAAA Turkey
O: 8SEP2021 01:40:02 36.5N 27.1E ML=4.5 EMSC DODECANESE IS.-TURKEY BORDER R
O: 7SEP2021 21:55:22 36.5N 27.1E mb=4.3 EMSC DODECANESE IS.-TURKEY BORDER R
P: 7SEP2021 136794 35.0N 26.0E 3.0-4.6 ABAAA Aegean Sea
NEIC reported this earthquake of M 5.0 in the Dodecanese Islands, Greece was felt with intensity V in the area(s) of Kosovo Servia and Montenegro.
O: 7SEP2021 09:42:40 37.8N 29.6E ML=4.0 EMSC WESTERN TURKEY
P: 7SEP2021 136845 38.0N 30.0E 3.5-5.1 AAAAA Turkey
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 7SEP2021 08:45:56 24.2S 179.7E mb=4.9 EMSC SOUTH OF FIJI ISLANDS
P: 7SEP2021 136946 25.0S 179.0E 4.0-5.4 AAAAA Tonga/Fiji
O: 7SEP2021 09:49:57 19.4S 176.1W Mw=5.8 EMSC FIJI REGION
O: 7SEP2021 09:49:57 19.4S 176.1W Mw=6.0 ANSS FIJI REGION
P: 8SEP2021 136944 20.0S 175.0W 4.0-5.7 AAAAA Tonga Islands
OCEAN RIDGES
O: 7SEP2021 10:22:08 59.4S 25.9W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
P: 7SEP2021 136964 59.0S 26.0W 4.0-5.6 AAAAA So. Sandwich Islands
No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.
ZEALANDIA AND AUSTRALIA REGION
O: 7SEP2021 08:47:05 31.4S 179.7E ML=4.7 EMSC KERMADEC ISLANDS REGION
P: 7SEP2021 136955 32.0S 179.0E 4.0-5.4 AAAAA So. Kermadec Islands
JAPAN AND KURIL ISLANDS
O: 7SEP2021 13:25:10 35.3N 141.4E mb=4.6 EMSC NEAR EAST COAST OF HONSHU, JAP
P: 4SEP2021 136825 36.0N 140.0E 4.0-5.5 BAAAA Off East Coast Honshu
O: 7SEP2021 18:41:23 39.3N 141.7E mb=4.4 EMSC EASTERN HONSHU, JAPAN
P: 8SEP2021 136856 42.0N 143.0E 3.5-5.5 ACAAA Hokkaido, Japan
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 7SEP2021 07:26:57 31.4N 115.5W ML=3.1 EMSC BAJA CALIFORNIA, MEXICO
P: 7SEP2021 136830 31.3N 116.3W 2.5-4.8 AAAAA So. California
O: 7SEP2021 18:21:35 31.6N 114.5W ML=3.6 EMSC GULF OF CALIFORNIA
P: 4SEP2021 136829 30.3N 114.3W 2.5-4.8 BBAAA So. California
O: 07SEP2021 21:09:15 33.7N 116.8W Ml=2.4 EMSC SOUTHERN CALIFORNIA
O: 7SEP2021 09:41:29 33.3N 116.8W Ml=2.7 EMSC SOUTHERN CALIFORNIA
P: 6SEP2021 136832 33.4N 116.7W 2.5-4.6 AAAAA So. California
NEIC reported this earthquake of M 2.7 in Southern California was felt with intensity II-III in the area(s) of Southern California at Santa Ysabel, Pala, Rancho Santa Margarita, Azusa, Carson and Northridge.
O: 7SEP2021 17:38:49 38.1N 118.7W ml=2.4 EMSC NEVADA
P: 10SEP2021 136800 38.2N 118.8W 2.5-4.4 BAAAA California/Nevada area
O: 7SEP2021 19:41:18 38.2N 117.8W ml=2.4 EMSC NEVADA
P: 6SEP2021 136801 38.6N 118.6W 2.5-4.8 AAAAA California/Nevada area
O: 7SEP2021 11:50:50 38.5N 119.5W ml=2.3 EMSC CENTRAL CALIFORNIA
P: 4SEP2021 136801 38.3N 119.3W 2.5-4.5 BAAAA California/Nevada area
O: 7SEP2021 17:39:07 40.5N 125.4W ML=2.9 EMSC OFFSHORE NORTHERN CALIFORNIA
P: 8SEP2021 136873 40.7N 124.6W 2.5-4.4 AAAAA Off Coast of No. Calif
NEIC reported this earthquake of M 3.3 off the coast of Northern California was felt with intensity II-III in the area(s) of Northern California at Ferndale, Fortuna, Eureka and Korbel.
ALASKA
O: 7SEP2021 15:18:57 55.3N 157.2W ML=3.3 EMSC ALASKA PENINSULA
P: 6SEP2021 136890 54.7N 157.9W 3.5-5.1 AAAAA Alaska Peninsula
O: 7SEP2021 19:13:09 60.0N 140.1W ml=3.0 EMSC SOUTHEASTERN ALASKA
P: 5SEP2021 136907 59.0N 139.0W 3.0-4.6 AAAAA Southeast Alaska
O: 08SEP2021 02:21:58 61.9N 150.2W ml=3.1 EMSC SOUTHERN ALASKA
O: 8SEP2021 00:57:24 61.5N 150.3W ML=3.1 EMSC SOUTHERN ALASKA
P: 8SEP2021 136912 61.3N 150.9W 3.2-5.3 AAAAA Central Alaska
NEIC reported this earthquake of M 3.0 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska at Anchorage and Eagle River.
O: 7SEP2021 10:11:21 69.1N 144.7W ml=3.4 EMSC NORTHERN ALASKA
P: 7SEP2021 136917 68.9N 144.8W 3.0-4.9 AAAAA Northern Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 7SEP2021 16:44:35 43.0N 126.5W ML=2.5 EMSC OFF COAST OF OREGON
P: 7SEP2021 136874 41.8N 126.9W 2.5-4.8 ABAAA Off Coast of No. Calif
ROCKY MOUNTAINS REGION
O: 7SEP2021 18:39:58 31.7N 104.4W ML=3.1 EMSC WESTERN TEXAS
P: 3SEP2021 136827 32.5N 104.6W 2.0-3.9 BAAAA SW U.S.A
O: 7SEP2021 08:19:29 32.1N 102.1W mb=2.4 EMSC WESTERN TEXAS
P: 6SEP2021 136827 31.6N 103.6W 2.0-3.9 AAAAA SW U.S.A
O: 7SEP2021 11:27:01 44.5N 115.2W Ml=2.3 EMSC SOUTHERN IDAHO
P: 7SEP2021 136862 44.4N 115.2W 2.0-4.0 AAAAA Montana/Idaho
EASTERN U.S./CANADA
O: 7SEP2021 07:47:21 35.0N 97.7W ML=2.2 EMSC OKLAHOMA
P: 9SEP2021 136843 36.0N 99.0W 2.0-4.4 AAAAA Southern Plains
O: 07SEP2021 11:57:53 36.7N 89.6W Md=2.0 EMSC SOUTHEASTERN MISSOURI
O: 8SEP2021 01:52:21 37.0N 90.0W Md=4.2 EMSC SOUTHEASTERN MISSOURI
P: 6SEP2021 136818 37.0N 90.0W 2.0-4.1 AAAAA New Madrid area
HAWAII
O: 7SEP2021 22:36:08 18.9N 155.2W ML=3.5 EMSC HAWAII REGION, HAWAII
O: 7SEP2021 12:27:42 19.2N 155.5W ML=3.6 EMSC ISLAND OF HAWAII, HAWAII
P: 3SEP2021 136779 19.3N 155.6W 4.0-5.7 BAAAA Hawaii area
NEIC reported this earthquake of M 3.6 in Hawaii was felt with intensity II-III in the area(s) of Hawaii at Naalehu, Keeau, Pepeekeo, Honomu and Kihei. An earlier M 3.4 quake was felt lightly in Naalehu, Captain Cook and Volcano, Hawaii.
MODERATELY STRONG QUAKE FELT IN TONGA
EARTHQUAKE SUMMARY FOR SEPTEMBER 5, 2021
The strongest earthquake in the world today was an M 5.9 in the Tonga Islands. NEIC reported it was felt with intensity IV in Nuku'alofa and II-III in Mu'a and Tofoa-Koloua, Tongatapu. The last earthquake within about 200 km of this epicenter in Tonga with M>=5.9 occurred more than a year ago as an M 5.9 on May 28, 2020 and prior to that an M 6.1 on June 15, 2019. Forecast 136689 and 136944 had expected this area would see enhanced seismicity in late August or early September.
O: 5SEP2021 17:51:44 21.9S 174.7W Mw=5.9 EMSC TONGA
P: 8SEP2021 136944 20.0S 175.0W 4.0-5.7 BBAAA Tonga Islands
P: 28AUG2021 136689 22.0S 175.0W 4.0-5.6 CAAAA Tonga Islands
Moderate earthquakes of M 4.3, 4.4 and 4.4 was felt widely in northern and western Mexico in San Luis Potosi and Guanajuato States of Mexico. NEIC reported maximum intensity V in Ahualulco and IV in San Felipe, Zaragoza, edina and II-III in Escalerillas, San Luis Potosi, Soledad, Leion Jauregui and Juarez. The only other event of M>=4.4 within about 250 km of this epicenter in the past 30 years was an M 4.4 about 250 km north of this on June 4, 2004. This series began yesterday with an M 4.3 and an M 4.1. These events are located at 103 degrees from the South Sandwich Islands M 8.1 of August 12 and were probably promoted from that source. Forecast 136767 had expected enhanced seismicity south of
this around September 7.
O: 05SEP2021 11:07:43 21.7N 101.0W ML=4.3 EMSC GUANAJUATO, MEXICO
O: 06SEP2021 04:49:49 21.7N 101.1W ML=4.4 EMSC GUANAJUATO, MEXICO
O: 6SEP2021 02:31:16 21.6N 100.9W mb=4.4 EMSC GUANAJUATO, MEXICO
P: 7SEP2021 136767 18.0N 100.0W 3.5-5.5 ACAAA Oaxaca, Mexico
Strong aftershocks also continued today in the South Sandwich Islands. The largest of these was an M 5.4. This continues the strong and lengthy aftershock series following the M 8.1 in the region of August 12. Forecasts 136964 and 136965 had expected today's activity was likely around September 7 within about 50 km of these events. An M 4.6 event occurred within several minutes of local solar noon and was probably promoted by high tidal stresses which maximize near this hour.
O: 05SEP2021 13:47:43 58.6S 25.0W mb=4.6 EMSC SOUTH SANDWICH ISLANDS REGION
O: 05SEP2021 09:59:01 58.7S 25.2W mb=5.4 EMSC SOUTH SANDWICH ISLANDS REGION
O: 05SEP2021 10:17:53 58.8S 25.1W mb=4.7 EMSC SOUTH SANDWICH ISLANDS REGION
O: 05SEP2021 10:28:59 59.3S 25.3W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
O: 5SEP2021 21:00:42 59.4S 25.8W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
P: 7SEP2021 136964 59.0S 26.0W 4.0-5.6 AAAAA So. Sandwich Islands
P: 7SEP2021 136965 60.0S 29.0W 4.0-5.8 AAAAA So. Sandwich Islands
The strongest earthquake in the U.S. or Canada today was an M 3.8 in Southern Alaska. NEIC reported this earthquake of M 3.5-3.8 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska at Homer. The last earthquake within about 100 km of this epicenter with M>=3.8 was an M 4.0 on August 14, 2021 and an M 4.2 on June 28, 2021. The last earthquake of M>4.5 in the area was an M 4.8 on June 7, 2019, an aftershock of an M 5.8 on May 27, 2019. Forecast 136912 had expected a moderate earthquake in this area was likely around September 7.
O: 05SEP2021 16:42:01 59.0N 152.8W ML=3.3 EMSC SOUTHERN ALASKA
O: 5SEP2021 12:28:10 59.3N 152.4W ML=3.8 EMSC SOUTHERN ALASKA
P: 7SEP2021 136912 60.1N 153.4W 3.2-5.2 AAAAA Central Alaska
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 05SEP2021 07:44:53 51.3N 89.6E mb=4.3 EMSC SOUTHWESTERN SIBERIA, RUSSIA
O: 5SEP2021 07:10:08 51.2N 89.4E mb=4.6 EMSC SOUTHWESTERN SIBERIA, RUSSIA
P: 7SEP2021 136861 46.0N 96.0E 4.0-5.7 ACCAA Mongolia
INDONESIA AND PHILIPPINES
O: 5SEP2021 13:17:50 2.4N 128.4E ML=4.1 EMSC HALMAHERA, INDONESIA
P: 29AUG2021 136439 5.0N 127.0E 4.0-5.4 CCBAA Halmahera
O: 5SEP2021 12:16:55 2.6S 127.6E mb=4.8 EMSC CERAM SEA, INDONESIA
P: 3SEP2021 136727 3.0S 128.0E 4.0-5.4 AAAAA Ceram area
O: 5SEP2021 15:23:13 4.1N 126.8E mb=4.7 EMSC KEPULAUAN TALAUD, INDONESIA
O: 6SEP2021 05:42:22 5.5N 126.3E ML=4.6 EMSC MINDANAO, PHILIPPINES
P: 29AUG2021 136439 5.0N 127.0E 4.0-5.4 CAAAA Halmahera
O: 5SEP2021 09:00:26 9.9N 122.1E mb=4.8 EMSC NEGROS, PHILIPPINES
P: 5SEP2021 136755 12.0N 121.0E 3.5-5.2 ACAAA Luzon, Philippines
NEIC reported this earthquake of M 4.6 in Negros, Philippines was felt with intensity II-III in the area(s) of Negros, Philippines at Sipalay (IV), Gacuyangan, Murcia, Imbang and Cebu.
No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.
CENTRAL AND SOUTH AMERICA
O: 6SEP2021 06:38 27.7S 69.7W mb=4.4 GUC Atacama at Copiapo, Diego de A
P: 4SEP2021 136935 28.0S 67.0W 4.0-5.5 AABAA Argentina
GUC repoted this earthquake was felt with intensity III in Atacama at Copiapo, Diego de Almagro and Tierra Amarilla and III in Coquimbo at La Higuera, Chile.
O: 5SEP2021 08:59:13 4.9S 80.8W ML=4.0 EMSC PERU-ECUADOR BORDER REGION
P: 5SEP2021 136728 4.0S 80.0W 4.0-5.6 AAAAA Ecuador
O: 5SEP2021 22:22:24 11.5N 86.8W mb=4.2 EMSC NEAR COAST OF NICARAGUA
P: 1SEP2021 136763 11.0N 87.0W 3.5-5.3 BAAAA Nicaragua
P: 3SEP2021 136763 12.0N 88.0W 3.5-5.5 AAAAA Nicaragua
NEIC reported this earthquake of M 4.2 in Nicaragua was felt with intensity II-III in the area(s) of Nicaragua at Managua.
O: 5SEP2021 08:14:05 18.1N 68.5W ML=3.0 EMSC MONA PASSAGE, DOMINICAN REPUBL
P: 6SEP2021 136770 19.0N 69.0W 3.4-5.3 AAAAA Puerto Rico
O: 05SEP2021 22:13:51 18.3N 73.7W ML=3.0 EMSC HAITI REGION
O: 5SEP2021 09:09:11 18.3N 74.4W ML=3.9 EMSC HAITI REGION
P: 7SEP2021 136771 19.0N 74.0W 3.4-5.3 AAAAA Puerto Rico
O: 06SEP2021 03:53:03 18.9N 68.7W ML=3.3 EMSC DOMINICAN REPUBLIC
O: 6SEP2021 04:38:05 19.0N 68.8W ML=3.3 EMSC DOMINICAN REPUBLIC REGION
P: 4SEP2021 136770 19.0N 68.0W 3.4-5.2 AAAAA Puerto Rico
O: 5SEP2021 12:25:39 20.2S 70.6W mb=4.5 EMSC OFFSHORE TARAPACA, CHILE
P: 6SEP2021 136935 21.0S 68.0W 4.0-5.8 AABAA Argentina
NEIC reported this earthquake of M 4.1 in Tarapaca, Chile was felt with intensity II-III in the area(s) of Tarapaca, Chile at Iquique.
O: 5SEP2021 08:42:17 20.4N 109.1W mb=4.8 EMSC REVILLA GIGEDO ISLANDS REGION
P: 6SEP2021 136778 20.0N 109.0W 3.5-5.0 AAAAA Gulf of California
O: 05SEP2021 11:07:43 21.7N 101.0W ML=4.3 EMSC GUANAJUATO, MEXICO
O: 06SEP2021 04:49:49 21.7N 101.1W ML=4.4 EMSC GUANAJUATO, MEXICO
O: 6SEP2021 02:31:16 21.6N 100.9W mb=4.4 EMSC GUANAJUATO, MEXICO
P: 7SEP2021 136767 18.0N 100.0W 3.5-5.5 ACAAA Oaxaca, Mexico
O: 5SEP2021 10:51:57 24.1S 67.4W mb=4.5 EMSC SALTA, ARGENTINA
P: 4SEP2021 136935 24.0S 64.0W 4.0-5.4 AACAA Argentina
O: 6SEP2021 06:38:36 27.7S 69.0W mb=4.6 EMSC CATAMARCA, ARGENTINA
P: 4SEP2021 136935 28.0S 67.0W 4.0-5.5 AABAA Argentina
O: 5SEP2021 15:05:12 29.9S 71.9W mb=4.3 EMSC OFFSHORE COQUIMBO, CHILE
P: 4SEP2021 136936 29.0S 72.0W 4.0-5.5 AAAAA Coast Central Chile
NEIC reported this earthquake of M 4.3 in Coquimbo, Chile was felt with intensity II-III in the area(s) of Santiago, Chile.
AFRICA AND EUROPE
O: 5SEP2021 21:27:52 36.0N 27.5E mb=4.1 EMSC DODECANESE ISLANDS, GREECE
P: 3SEP2021 136844 38.0N 28.0E 3.5-5.3 ABAAA Turkey
NEIC reported this earthquake of M 4.1 in the Dodecanese Islands, Greece was felt with intensity II-III in the area(s) of the Dodecanese Islands, Greece at Lardos.
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 5SEP2021 20:29:26 12.5S 167.0E mb=4.4 EMSC SANTA CRUZ ISLANDS
P: 2SEP2021 136933 13.0S 167.0E 4.0-5.4 BAAAA Vanuatu Islands
O: 5SEP2021 12:52:23 14.7S 167.9E mb=4.8 EMSC VANUATU
P: 10SEP2021 136933 14.0S 167.0E 4.0-5.5 BAAAA Vanuatu Islands
O: 6SEP2021 06:22:22 15.9S 166.5E Mw=4.8 EMSC VANUATU
P: 9SEP2021 136934 16.0S 168.0E 4.0-5.4 BAAAA Vanuatu Islands
O: 5SEP2021 17:51:44 21.9S 174.7W Mw=5.9 EMSC TONGA
P: 8SEP2021 136944 20.0S 175.0W 4.0-5.7 BBAAA Tonga Islands
P: 28AUG2021 136689 22.0S 175.0W 4.0-5.6 CAAAA Tonga Islands
OCEAN RIDGES
O: 6SEP2021 04:32:06 28.5S 12.7W mb=5.0 EMSC SOUTHERN MID-ATLANTIC RIDGE
O: 05SEP2021 13:47:43 58.6S 25.0W mb=4.6 EMSC SOUTH SANDWICH ISLANDS REGION
O: 05SEP2021 09:59:01 58.7S 25.2W mb=5.4 EMSC SOUTH SANDWICH ISLANDS REGION
O: 05SEP2021 10:17:53 58.8S 25.1W mb=4.7 EMSC SOUTH SANDWICH ISLANDS REGION
O: 05SEP2021 10:28:59 59.3S 25.3W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
O: 5SEP2021 21:00:42 59.4S 25.8W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
P: 7SEP2021 136964 59.0S 26.0W 4.0-5.6 AAAAA So. Sandwich Islands
P: 7SEP2021 136965 60.0S 29.0W 4.0-5.8 AAAAA So. Sandwich Islands
ZEALANDIA AND AUSTRALIA REGION
No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia
today. GeoNet did not report any felt events in the area.
JAPAN AND KURIL ISLANDS
O: 5SEP2021 17:03:55 45.4N 149.6E mb=4.3 EMSC KURIL ISLANDS
P: 2SEP2021 136856 44.0N 147.0E 3.5-5.9 BBBAA Hokkaido, Japan
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 05SEP2021 17:24:14 31.4N 115.5W ML=3.1 EMSC BAJA CALIFORNIA, MEXICO
O: 5SEP2021 09:38:57 31.3N 115.8W ML=3.3 EMSC BAJA CALIFORNIA, MEXICO
P: 7SEP2021 136830 31.3N 116.3W 2.5-4.8 AAAAA So. California
O: 6SEP2021 02:01:51 36.0N 117.3W Ml=2.6 EMSC CENTRAL CALIFORNIA
P: 5SEP2021 136797 36.7N 117.2W 2.5-4.8 AAAAA California/Nevada area
NEIC reported this earthquake of M 2.6 in Central California was felt with intensity II-III in the area(s) of Central California at Ridgecrest.
O: 6SEP2021 00:01:43 36.1N 118.1W ML=2.7 EMSC CENTRAL CALIFORNIA
O: 5SEP2021 23:39:21 36.2N 118.1W ML=3.1 EMSC CENTRAL CALIFORNIA
P: 9SEP2021 136796 36.1N 118.1W 2.5-4.6 BAAAA California/Nevada area
O: 5SEP2021 15:31:54 38.4N 119.6W Md=2.3 EMSC CENTRAL CALIFORNIA
P: 4SEP2021 136801 38.3N 119.3W 2.5-4.5 AAAAA California/Nevada area
O: 5SEP2021 21:06:24 38.8N 122.8W Md=2.3 EMSC NORTHERN CALIFORNIA
P: 6SEP2021 136806 38.8N 122.8W 2.5-4.5 AAAAA Central California
ALASKA
O: 5SEP2021 14:55:22 56.2N 153.0W ML=3.3 EMSC KODIAK ISLAND REGION, ALASKA
P: 6SEP2021 136891 55.0N 150.9W 3.5-5.1 ABBAA South of Alaska
O: 05SEP2021 16:42:01 59.0N 152.8W ML=3.3 EMSC SOUTHERN ALASKA
O: 5SEP2021 12:28:10 59.3N 152.4W ML=3.8 EMSC SOUTHERN ALASKA
P: 7SEP2021 136912 60.1N 153.4W 3.2-5.2 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: 05SEP2021 18:45:03 31.7N 104.4W ML=2.8 EMSC WESTERN TEXAS
O: 06SEP2021 03:44:36 31.7N 104.4W ML=2.7 EMSC WESTERN TEXAS
O: 06SEP2021 03:50:55 31.7N 104.4W ML=2.8 EMSC WESTERN TEXAS
O: 06SEP2021 04:38:36 31.7N 104.4W ML=3.4 EMSC WESTERN TEXAS
O: 5SEP2021 18:45:03 31.7N 104.4W ML=2.8 EMSC WESTERN TEXAS
P: 3SEP2021 136827 32.5N 104.6W 2.0-3.9 AAAAA SW U.S.A
P: 6SEP2021 136827 31.6N 103.6W 2.0-3.9 AAAAA SW U.S.A
EASTERN U.S./CANADA
O: 5SEP2021 10:48:40 36.1N 89.7W Md=2.3 EMSC SOUTHEASTERN MISSOURI
P: 6SEP2021 136818 37.0N 90.0W 2.0-4.1 AAAAA New Madrid area
O: 6SEP2021 00:50:44 36.5N 98.5W ML=2.2 EMSC OKLAHOMA
P: 8SEP2021 136843 37.0N 98.0W 2.0-4.4 AAAAA Southern Plains
HAWAII
No earthquakes of M>=3 were located in Hawaii.
UNUSUAL HIGH LATITUDE QUAKES ASSOCIATED WITH EARLIER GEOMAGNETIC STORM
EARTHQUAKE SUMMARY FOR SEPTEMBER 4, 2021
The strongest earthquake in the U.S. or Canada was an M 4.4 in Baffin Bay. While an M 3.3 hit near this epicenter on September 1, 2021, the last event in the region within about 200 km with M>=4.4 since an M 4.6 on October 22, 2019 and an M 4.6 on May 22, 2017. These may be regional aftershocks of an M 6.0 in the area on July 7, 2009. This may have been promoted by the recent geomagnetic storm which would have preferentially enhanced seismicity at high latitudes such as in the South Sandwich Islands and Baffin Bay, Canada as noted in earlier summaries:
"This geomagnetic storm is expected to continue through the end of August and may enhance global seismicity especially at high latitudes " (August 31, 2021)
O: 4SEP2021 18:58:14 73.3N 73.0W mb=4.4 EMSC BAFFIN BAY
The strongest earthquake in the world today was once again in the South Sandwich Islands. Forecast 136964 had expected this event within about 50 km in early September. It is an aftershock of the M 8.1 of August 12, 2021 and continues a slowly declining aftershock sequence.
O: 04SEP2021 13:55:59 58.1S 25.3W mb=4.7 EMSC SOUTH SANDWICH ISLANDS REGION
O: 05SEP2021 02:03:21 58.7S 23.9W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
O: 04SEP2021 16:13:02 58.9S 25.3W mb=5.1 EMSC SOUTH SANDWICH ISLANDS REGION
O: 04SEP2021 07:44:28 59.0S 25.5W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
O: 5SEP2021 05:26:32 56.8S 25.8W Mw=5.5 EMSC SOUTH SANDWICH ISLANDS REGION
P: 9SEP2021 136964 57.0S 25.0W 4.0-5.6 BAAAA So. Sandwich Islands
An unusual earthquake of M 4.5 occurred today in the Madeira Islands southwest of Portugal. It was not reported felt in this area. The last such earthquakes in the Madeira Islands occurred as M 4.7 events on January 1, 2021 and January 30, 2021.
O: 5SEP2021 06:10:44 32.6N 17.3W mb=4.5 EMSC MADEIRA ISLANDS, PORTUGAL REGI
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: 4SEP2021 12:05:17 26.5N 96.5E mb=4.5 EMSC MYANMAR
P: 6SEP2021 136784 25.0N 97.0E 4.0-5.5 ABAAA Myanmar
O: 5SEP2021 02:52:54 28.3N 88.1E ML=4.3 EMSC WESTERN XIZANG
P: 4SEP2021 136851 30.0N 88.0E 3.8-5.6 ABAAA Xizang
O: 4SEP2021 14:16:46 37.5N 72.3E mb=4.1 EMSC TAJIKISTAN
P: 2SEP2021 136812 36.0N 71.0E 3.8-5.5 ABAAA Hindu Kush/Pakistan
P: 8SEP2021 136812 37.0N 71.0E 3.8-5.4 BAAAA Hindu Kush/Pakistan
O: 4SEP2021 17:52:07 37.8N 77.9E mb=4.6 EMSC SOUTHERN XINJIANG, CHINA
P: 4SEP2021 136823 39.0N 77.0E 3.8-5.2 ABAAA Northern India
INDONESIA AND PHILIPPINES
O: 4SEP2021 15:52:48 0.2S 124.5E mb=4.7 EMSC MOLUCCA SEA
P: 5SEP2021 136719 0.0N 123.0E 4.0-5.5 AABAA Mindanao, Philippines
P: 6SEP2021 136741 2.0S 124.0E 4.0-5.4 ABAAA Sulawesi area
O: 4SEP2021 12:23:17 1.5N 119.8E ML=4.0 EMSC MAKASSAR STRAIT, INDONESIA
P: 3SEP2021 136713 0.0N 122.0E 4.0-5.6 ABBAA Celebes Sea
P: 26AUG2021 136434 1.0N 120.0E 4.0-5.4 CAAAA Celebes Sea
O: 5SEP2021 01:40:10 2.1S 99.6E mb=4.9 EMSC KEP. MENTAWAI REGION, INDONESI
P: 10SEP2021 136739 2.0S 101.0E 4.0-5.6 BABAA So. of Sumatera
O: 4SEP2021 23:41:38 5.5S 154.2E mb=5.0 EMSC BOUGAINVILLE REGION, P.N.G.
O: 4SEP2021 18:43:41 6.4S 154.9E Mw=5.3 EMSC BOUGAINVILLE REGION, P.N.G.
P: 7SEP2021 136732 6.0S 154.0E 4.0-5.4 BAAAA New Britain
NEIC reported this earthquake of M 5.3 in Bougainville, New Guinea was felt with intensity II-III in the area(s) of New Guinea at Arawa and Bulcio Morobe.
O: 5SEP2021 01:08:53 6.3S 130.1E mb=4.3 EMSC BANDA SEA
O: 5SEP2021 04:47:55 7.3S 128.4E ML=4.6 EMSC KEPULAUAN BARAT DAYA, INDONESI
P: 9SEP2021 136724 7.0S 128.0E 4.0-5.4 BAAAA Banda Sea
O: 4SEP2021 07:29:02 9.5S 113.0E mb=4.9 EMSC SOUTH OF JAVA, INDONESIA
P: 2SEP2021 136737 9.0S 113.0E 4.0-5.7 AAAAA So. of Bali
NEIC reported this earthquake of M 4.9 south of Java was felt with intensity II-III in the area(s) of Java at Malang.
O: 4SEP2021 23:03:08 12.2N 144.2E Mw=5.3 EMSC GUAM REGION
P: 5SEP2021 136772 12.0N 141.0E 4.0-5.8 AACAA So. Marianas/Guam
P: 9SEP2021 136772 13.0N 144.0E 4.0-5.4 BAAAA So. Marianas/Guam
NEIC reported this earthquake of M 5.3 in Guam was felt with intensity II-III in the area(s) of Guam at Tamuning.
CENTRAL AND SOUTH AMERICA
O: 4SEP2021 09:48:30 10.6N 83.1W ML=4.3 EMSC COSTA RICA
P: 2SEP2021 136745 10.0N 84.0W 3.5-5.1 AAAAA Caribbean Sea
O: 4SEP2021 14:40:00 12.6N 86.4W ML=4.0 EMSC NICARAGUA
P: 3SEP2021 136763 12.0N 88.0W 3.5-5.5 AABAA Nicaragua
O: 4SEP2021 15:30:39 15.6N 96.1W ML=4.3 EMSC OFFSHORE OAXACA, MEXICO
P: 5SEP2021 136766 16.0N 96.0W 3.5-5.5 AAAAA Oaxaca, Mexico
O: 4SEP2021 09:07:31 15.8S 72.1W mb=4.3 EMSC SOUTHERN PERU
P: 3SEP2021 136929 16.0S 74.0W 4.0-5.8 AABAA So. Peru/Bolivia
NEIC reported this earthquake of M 4.3 in Southern Peru was felt with intensity II-III in the area(s) of Southern Peru at Arequipa.
O: 04SEP2021 22:50:35 18.4N 71.2W ML=3.5 EMSC DOMINICAN REPUBLIC
O: 04SEP2021 22:36:40 18.5N 73.5W ML=3.5 EMSC HAITI REGION
O: 04SEP2021 22:36:40 18.5N 73.5W ML=3.5 EMSC HAITI REGION
O: 4SEP2021 15:39:29 18.4N 73.7W ML=3.6 EMSC HAITI REGION
P: 7SEP2021 136771 19.0N 74.0W 3.4-5.3 BAAAA Puerto Rico
O: 04SEP2021 16:30:58 19.0N 66.6W Md=3.4 EMSC PUERTO RICO REGION
O: 05SEP2021 05:25:58 19.0N 65.3W ML=3.2 EMSC PUERTO RICO REGION
O: 4SEP2021 12:56:03 19.1N 66.6W Md=3.1 EMSC PUERTO RICO REGION
P: 6SEP2021 136768 18.0N 67.0W 3.4-5.4 ABAAA Puerto Rico
O: 4SEP2021 22:49:44 19.6N 108.5W ML=4.3 EMSC REVILLA GIGEDO ISLANDS REGION
P: 6SEP2021 136778 20.0N 109.0W 3.5-5.0 AAAAA Gulf of California
O: 4SEP2021 17:50:18 25.8N 100.4W ML=3.9 EMSC NUEVO LEON, MEXICO
O: 04SEP2021 09:38:27 21.6N 101.2W mb=4.1 EMSC GUANAJUATO, MEXICO
O: 04SEP2021 09:55:37 21.6N 101.1W ML=3.6 EMSC GUANAJUATO, MEXICO
O: 04SEP2021 20:15:15 21.6N 101.1W ML=3.7 EMSC GUANAJUATO, MEXICO
O: 04SEP2021 09:46:29 21.7N 101.0W ML=3.6 EMSC GUANAJUATO, MEXICO
O: 04SEP2021 10:35:30 21.7N 101.0W ML=4.3 EMSC GUANAJUATO, MEXICO
O: 4SEP2021 21:12:07 21.5N 101.1W ML=3.8 EMSC GUANAJUATO, MEXICO
P: 2SEP2021 136759 18.0N 101.0W 3.5-5.1 ACAAA Michoacan, Mexico
NEIC reported this earthquake of M 4.0 in Guanajuato at Leon Allende, Escalerilla San Luis Potosi and Tlalnepantla. was felt with intensity II-III in the area(s) of
O: 4SEP2021 08:25:32 24.0S 66.9W mb=4.2 EMSC JUJUY, ARGENTINA
P: 4SEP2021 136935 24.0S 64.0W 4.0-5.4 AACAA Argentina
AFRICA AND EUROPE
O: 5SEP2021 02:50:04 35.5N 3.6W ML=3.3 EMSC STRAIT OF GIBRALTAR
P: 7SEP2021 136816 35.0N 4.0W 3.5-5.3 AAAAA Morocco/Spain
O: 4SEP2021 10:29:13 36.7N 4.6W mb=3.3 EMSC STRAIT OF GIBRALTAR
P: 29AUG2021 136541 37.0N 4.0W 3.5-5.1 BAAAA Morocco/Spain
O: 5SEP2021 06:10:44 32.6N 17.3W mb=4.5 EMSC MADEIRA ISLANDS, PORTUGAL REGI
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 4SEP2021 07:53:50 17.3S 167.8E Mw=5.1 EMSC VANUATU
P: 29AUG2021 136676 18.0S 168.0E 4.0-5.6 BAAAA Vanuatu Islands
O: 5SEP2021 01:17:05 20.9S 178.7W mb=4.2 EMSC FIJI REGION
P: 4SEP2021 136944 23.0S 177.0W 4.0-5.6 ACBAA Tonga Islands
OCEAN RIDGES
O: 04SEP2021 13:55:59 58.1S 25.3W mb=4.7 EMSC SOUTH SANDWICH ISLANDS REGION
O: 05SEP2021 02:03:21 58.7S 23.9W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
O: 04SEP2021 16:13:02 58.9S 25.3W mb=5.1 EMSC SOUTH SANDWICH ISLANDS REGION
O: 04SEP2021 07:44:28 59.0S 25.5W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
O: 5SEP2021 05:26:32 56.8S 25.8W Mw=5.5 EMSC SOUTH SANDWICH ISLANDS REGION
P: 9SEP2021 136964 57.0S 25.0W 4.0-5.6 BAAAA So. Sandwich Islands
ZEALANDIA AND AUSTRALIA REGION
O: 5SEP2021 05:09:16 32.5S 179.0W Mw=5.3 EMSC SOUTH OF KERMADEC ISLANDS
P: 27AUG2021 136699 32.0S 180.0W 4.0-5.4 CAAAA So. Kermadec Islands
JAPAN AND KURIL ISLANDS
O: 4SEP2021 07:30:22 28.3N 139.3E mb=4.2 EMSC BONIN ISLANDS, JAPAN REGION
P: 4SEP2021 136776 28.0N 142.0E 4.0-5.6 AABAA Bonin Islands
O: 5SEP2021 05:48:58 41.3N 142.6E mb=4.5 EMSC HOKKAIDO, JAPAN REGION
P: 8SEP2021 136856 42.0N 143.0E 3.5-5.5 BAAAA Hokkaido, Japan
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 4SEP2021 17:28:01 31.8N 116.3W ML=3.3 EMSC BAJA CALIFORNIA, MEXICO
P: 7SEP2021 136830 31.3N 116.3W 2.5-4.8 BAAAA So. California
O: 4SEP2021 13:09:51 33.3N 118.0W Ml=2.1 EMSC GULF OF SANTA CATALINA, CALIF.
P: 6SEP2021 136833 33.7N 117.5W 2.5-4.6 AAAAA So. California
O: 4SEP2021 16:34:09 35.3N 121.0W Md=2.3 EMSC OFFSHORE CENTRAL CALIFORNIA
P: 3SEP2021 136826 35.6N 121.3W 2.5-4.8 AAAAA Off So. California
O: 4SEP2021 16:01:59 35.5N 118.4W Ml=2.2 EMSC CENTRAL CALIFORNIA
P: 5SEP2021 136838 35.6N 118.4W 2.5-4.4 AAAAA So. California
O: 4SEP2021 07:28:42 35.7N 117.5W Ml=2.1 EMSC SOUTHERN CALIFORNIA
P: 5SEP2021 136836 35.0N 117.7W 2.5-4.4 AAAAA So. California
O: 4SEP2021 16:15:13 37.0N 121.6W Md=2.2 EMSC NORTHERN CALIFORNIA
P: 5SEP2021 136805 37.4N 121.8W 2.5-4.4 AAAAA Central California
O: 4SEP2021 10:19:07 38.1N 118.3W ML=3.2 EMSC NEVADA
P: 6SEP2021 136801 38.6N 118.6W 2.5-4.8 AAAAA California/Nevada area
O: 5SEP2021 05:27:45 39.1N 123.1W ML=3.2 EMSC NORTHERN CALIFORNIA
O: 5SEP2021 05:27:45 39.1N 123.1W ML=3.7 ANSS NORTHERN CALIFORNIA
P: 7SEP2021 136807 39.0N 123.1W 2.5-4.4 AAAAA Central California
NEIC reported this earthquake of M 3.7 in Northern California was felt with intensity II-III in the area(s) of Northern California at Ukiah, Lakeport, Upper Lake, Hopland, Nice, Boonville, Potter Valley, Willits and Clearlake.
ALASKA
O: 04SEP2021 14:23:56 55.2N 156.8W ML=3.5 EMSC SOUTH OF ALASKA
O: 04SEP2021 16:01:41 55.3N 157.5W ML=3.1 EMSC ALASKA PENINSULA
O: 05SEP2021 05:06:43 56.5N 155.7W ML=3.7 EMSC ALASKA PENINSULA
O: 5SEP2021 00:34:24 54.8N 155.0W ML=3.3 EMSC SOUTH OF ALASKA
P: 2SEP2021 136890 54.7N 156.9W 3.5-5.1 BABAA Alaska Peninsula
O: 4SEP2021 19:31:27 54.2N 153.2W ML=3.3 EMSC SOUTH OF ALASKA
P: 6SEP2021 136891 55.0N 150.9W 3.5-5.1 AABAA South of Alaska
O: 4SEP2021 21:22:57 54.6N 161.4W ML=3.0 EMSC ALASKA PENINSULA
P: 10SEP2021 136908 54.3N 161.4W 3.5-5.1 CAAAA Unimak Islands, Aleutians
O: 4SEP2021 11:55:37 60.8N 147.7W ML=3.4 EMSC SOUTHERN ALASKA
P: 4SEP2021 136913 61.4N 146.5W 3.2-4.9 AAAAA Central Alaska
O: 5SEP2021 06:21:25 61.6N 150.0W ML=3.3 EMSC SOUTHERN ALASKA
P: 4SEP2021 136912 60.8N 151.7W 3.2-5.5 AAAAA Central Alaska
O: 05SEP2021 04:16:00 60.0N 140.2W ml=3.4 EMSC SOUTHEASTERN ALASKA
O: 05SEP2021 04:29:05 60.0N 140.1W ml=3.3 EMSC SOUTHEASTERN ALASKA
O: 05SEP2021 04:50:24 60.0N 140.2W ml=3.4 EMSC SOUTHERN YUKON TERRITORY, CANADA
O: 05SEP2021 01:26:51 60.1N 140.4W ML=3.1 EMSC SOUTHERN YUKON TERRITORY, CANADA
O: 5SEP2021 02:54:21 60.0N 140.1W ml=3.5 EMSC SOUTHERN YUKON TERRITORY, CANA
P: 5SEP2021 136907 59.0N 139.0W 3.0-4.6 AAAAA Southeast Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 4SEP2021 20:57:27 44.2N 129.0W mb=4.0 EMSC OFF COAST OF OREGON
P: 6SEP2021 136875 44.4N 129.3W 3.0-4.8 AAAAA Off Coast of Oregon
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 at Cloverdale, Monroe, McMinnville, Salem, Portland and in Peshastin, Washington.
ROCKY MOUNTAINS REGION
O: 04SEP2021 11:56:06 31.7N 104.0W ML=2.5 EMSC WESTERN TEXAS
O: 4SEP2021 23:08:12 31.0N 103.5W ML=2.7 EMSC WESTERN TEXAS
P: 6SEP2021 136827 31.6N 103.6W 2.0-3.9 AAAAA SW U.S.A
O: 4SEP2021 13:02:59 44.6N 112.0W ML=2.2 EMSC WESTERN MONTANA
P: 2SEP2021 136889 44.2N 110.3W 2.0-4.0 AABAA Yellowstone/Wyoming
O: 4SEP2021 13:41:36 47.4N 113.1W Ml=2.4 EMSC WESTERN MONTANA
P: 7SEP2021 136863 47.7N 117.4W 2.0-4.1 BACAA Montana/Idaho
EASTERN U.S./CANADA
O: 3SEP2021 04:55:24 45.7N 74.8W MB=1.8 ECAN L'Orignal, ON
P: 4SEP2021 136867 45.0N 74.0W 2.0-4.3 AAAAA New York State
O: 4SEP2021 18:58:14 73.3N 73.0W mb=4.4 EMSC BAFFIN BAY
O: 4SEP2021 21:17:54 35.0N 97.8W mb=2.9 EMSC OKLAHOMA
P: 2SEP2021 136843 35.0N 97.0W 2.0-4.3 AAAAA Southern Plains
NEIC reported this earthquake of M 3.3 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma at Alex, Bradley, Blanchard and Purcel.
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.
QUAKES IN NORTH ISLAND, NEW ZEALAND; ANTIPODAL AREAS OF OKHOTSK AND SOUTH SANDWICH IS
EARTHQUAKE SUMMARY FOR SEPTEMBER 3, 2021
An earthquake of M 5.0 was widely felt in the Hastings area of North Island, New Zealand today. NEIC reported it was felt with maximum intensity V in New Zealand in Otane, Hastings, Hawke's Bay and IV in Waipukurau, Dannevirke, Napier, Palmersont North and II-III in Ohakune, Wairoa, Turngi and Masterton, New Zealand. GEONET reported this earthquake was felt with moderate intensity in southeastern North Island. More than 6154 people reported feeling this earthquake. Light to moderate intensity was reported throughout much of southern and eastern North Island and northern South Island. 1513 reports of weak intensity; 2970 of light intensity; 1470 with moderate; 184 with strong shaking and 6 with severe and 11 with extreme intensity. This is the strongest earthquake in North Island within about 200 km of this epicenter since an M 5.9 on November 22, 2016. Forecasts 136957 and 136702 had expected this activity was likely within this range at the end of August or in early September, 2021.
O: 04SEP2021 04:54:27 40.0S 176.6E MS=4.9 GEONET Felt with moderate intensity
O: 4SEP2021 04:54:26 40.0S 176.7E mb=5.0 EMSC NORTH ISLAND OF NEW ZEALAND
P: 1SEP2021 136957 40.0S 174.0E 3.0-4.4 BABAA North Island, N.Z.
P: 28AUG2021 136702 40.0S 175.0E 3.0-4.4 CABAA North Island, N.Z.
The strongest earthquakes in the world today occurred at the near-antipodal areas of the South Sandwich Islands (M 5.7) and the Sea of Okhotsk, Russia (M 5.8). The earthquake in the South Sandwich Islands is not surprising as earthquakes of this size have occurred almost daily since the M 8.1 there on August 12, 2021. It was accompanied by aftershocks of M 4.5 and 4.7. Forecast 136964 had expected this event within about 100 km was likely around September 7.
O: 03SEP2021 16:50:32 57.9S 24.8W mb=4.7 EMSC SOUTH SANDWICH ISLANDS REGION
O: 03SEP2021 18:14:59 58.5S 25.6W mb=4.5 EMSC SOUTH SANDWICH ISLANDS REGION
O: 3SEP2021 07:49:43 59.9S 26.7W Mw=5.7 EMSC SOUTH SANDWICH ISLANDS REGION
P: 7SEP2021 136964 59.0S 26.0W 4.0-5.6 BAAAA So. Sandwich Islands
The earthquake of M 5.8 in the Sea of Okhotsk was reported lightly felt in this area. It occurred in the antipodal area of the South Sandwich Islands and was probably promoted by strong energy from that source. A possible precursory earthquake hit the area yesterday and was commented on in the previous summary as:
"The strongest earthquake felt in the world today was an M 5.2 northwest of the Kuril Islands. It was not reported felt in this region. The last earthquake of M>=5.2 within about 200 km of this epicenter was an M 5.4 on September 18, 2014 and prior to that an M 5.2 on July 9, 2008. An M 6.7 hit about 200 km northeast of today's epicenter on May 24, 2013. The event in 2013 followed an M 8.3 in the Sea of Okhotsk earlier on that date. At the time of that event, this summary noted:
"A great earthquake of M 8.2-8.3 hit deep under Kamchatka and the Sea of
Okhotsk, Russia today. It was preceded by major earthquakes in Northern California (M 5.7) and Tonga (M 7.4). While it was too deep to have triggered a significant tsunami, it was felt throughout the northwestern Pacific rim. Because of its size and great depth it was felt as far as Moscow, 7,000 km to the west where shaking caused evacuation of some office buildings and people fled into the streets/" (May 24, 2013)
These areas show deep focus earthquakes and may help trigger each other." (September 3, 2021)
This earthquake in the Sea of Okhotsk is the strongest within about 200 km of this epicenter in at least 30 years - since 1990. Forecast 136640 had expected enhanced seismicity in this area within about 100 km of today's epicenter was likely around August 29. This epicenter is at 103 degrees from the M 7.2 in Haiti of August 14 and was probably promoted by strong seismic energy from that source.
O: 3SEP2021 10:14:25 49.5N 147.0E Mw=5.8 EMSC SEA OF OKHOTSK
P: 29AUG2021 136640 50.0N 148.0E 4.0-5.4 BAAAA Sakhalin
MODERATE QUAKES UNDER WORLD'S OCEANS
EARTHQUAKE SUMMARY FOR SEPTEMBER 2, 2021
A series of moderately large earthquake hit under the world's oceans today. None of these were reported felt. The largest was an M 5.6 in the South Sandwich Islands but activity also continued in the Scotia Sea following a moderate quake in that area yesterday. An earthquake of M 4.6 in the Azores was the strongest within about 200 km of this epicenter since an M 4.8 on July 24, 2021 - the largest in the past year. This area may have been promoted by energy from the South Sandwich Islands as it is located at 103 degrees from those epicenters - a distance at which strong energy concentration occurs on the earth's surface following major earthquakes.
O: 2SEP2021 14:17:56 42.0N 29.4W mb=4.6 EMSC AZORES ISLANDS REGION
P: 8SEP2021 136869 41.0N 30.0W 4.0-5.8 CAAAA No. Mid-Atlantic Ridge
Many of these events occurred near local solar midnight or local solar noon and were probably promoted by high tidal stresses which maximize near this hour. These included the events in the East Pacific Rise (local midnight); the Azores (local noon) and the South Sandwich Islands (local midnight).
An M 5.4 also occurred in the Southeast Pacific Rise west of Central Chile. The last similar activity within about 250 km of the events in the Southern East Pacific Rise as an M 5.8 on December 25, 2019 and an M 5.4 on May 4, 2019 following a lull from 2014 to 2019. Forecast 136940 had expected today's activity within about 100 km of today's Pacific Rise activity in early September. This activity is at the fifth node (72 degrees) from the M 6.9 in the Vanuatu Islands and at the sixth node (60 degrees) from the Haiti quake of August 14 and was probably promoted by energy from those sources.
O: 03SEP2021 05:40:10 24.5S 116.1W mb=4.8 EMSC SOUTHERN EAST PACIFIC RISE
O: 3SEP2021 05:22:57 24.3S 116.0W Mw=5.4 EMSC SOUTHERN EAST PACIFIC RISE
P: 8SEP2021 136940 24.0S 115.0W 4.0-5.6 BAAAA So. East Pacific Rise
O: 2SEP2021 17:58:55 60.4S 48.8W mb=4.7 EMSC SCOTIA SEA
O: 02SEP2021 08:47:25 58.9S 25.5W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
O: 02SEP2021 12:01:52 59.2S 24.9W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
O: 03SEP2021 00:56:41 59.4S 25.7W mb=4.7 EMSC SOUTH SANDWICH ISLANDS REGION
O: 3SEP2021 00:06:16 58.8S 25.8W Mw=5.6 EMSC SOUTH SANDWICH ISLANDS REGION
P: 7SEP2021 136964 59.0S 26.0W 4.0-5.6 BAAAA So. Sandwich Islands
The strongest earthquake felt in the world today was an M 5.2 northwest of the Kuril Islands. It was not reported felt in this region. The last earthquake of M>=5.2 within about 200 km of this epicenter was an M 5.4 on September 18, 2014 and prior to that an M 5.2 on July 9, 2008. An M 6.7 hit about 200 km northeast of today's epicenter on May 24, 2013. The event in 2013 followed an M 8.3 in the Sea of Okhotsk earlier on that date. At the time of that event, this summary noted:
"A great earthquake of M 8.2-8.3 hit deep under Kamchatka and the Sea of
Okhotsk, Russia today. It was preceded by major earthquakes in Northern California (M 5.7) and Tonga (M 7.4). While it was too deep to have triggered a significant tsunami, it was felt throughout the northwestern Pacific rim. Because of its size and great depth it was felt as far as Moscow, 7,000 km to the west where shaking caused evacuation of some office buildings and people fled into the streets/" (May 24, 2013)
These areas show deep focus earthquakes and may help trigger each other. Forecast 136640 expected today's activity in this area was likely around August 29.
O: 2SEP2021 20:26:14 50.5N 150.5E Mw=5.2 EMSC NORTHWEST OF KURIL ISLANDS
P: 29AUG2021 136640 50.0N 148.0E 4.0-5.4 BABAA Sakhalin
A moderate earthquake of M 4.8 shook the Caucasus region of Russia today. NEIC reported this earthquake of M 4.8 in the Caucasus, Russia was felt with intensity II-III in the area(s) of Georgia at Telari, Kakheti and Tbilisi.
The last earthquake within about 200 km of this epicenter with larger magnitude was an M 4.9 on August 10, 2019 and an M 5.3 on June 5, 2018. Forecast 136846 had expected activity to the south of this around September 3.
O: 3SEP2021 03:34:49 42.4N 46.1E mb=4.8 EMSC CAUCASUS REGION, RUSSIA
P: 3SEP2021 136846 38.0N 44.0E 3.5-5.0 ACBAA Turkey
The strongest earthquakes in the U.S. or Canada today were an M 4.6 south of Alaska in the Alaska Peninsula area and an M 4.7 in the Unimak Island region of Alaska. These events were not reported felt in the area. The M 4.7 in the Unimak Island area was the strongest in that region since an M 5.1 on January 11, 2021. Forecast 136908 had expected enhanced seismicity in the Unimak Islands was likely around September 2.
O: 3SEP2021 03:55:44 53.5N 163.6W mb=4.7 EMSC UNIMAK ISLAND REGION, ALASKA
P: 2SEP2021 136908 54.6N 163.6W 3.5-5.0 ABAAA Unimak Islands, Aleutians
The earthquake of M 4.6 South of Alaska was the strongest within about 150 km of that epicenter since an M 6.1 on July 29, 2021. Forecast 136890 had expected enhanced seismicity in this area was likely around September 2.
O: 2SEP2021 08:08:34 54.5N 159.7W mb=4.6 EMSC SOUTH OF ALASKA
P: 2SEP2021 136890 54.7N 156.9W 3.5-5.1 AABAA Alaska Peninsula
An M 4.2 in western Texas today was accompanied by a strong series of foreshocks and aftershocks. NEIC reported this earthquake of M 4.2 in Western Texas was felt with intensity II-III in the area(s) of New Mexico at Carlsbad, Artesia, Alamogordo, Roswell, Capitan. Several aftershocks were felt lightly in Roswell, New Mexico. This area has seen a long series of moderate earthquakes this year including events of M 4.3, 4.4 and 4.5 on March 17, 2021, June 25, 2021 and July 28, 2021. This series began with an M 5.0 on March 26, 2021 after nine years of quiet at this magnitude in the area. Forecast 136827 had expected enhanced seismicity in this area was likely around September 3.
O: 02SEP2021 07:23:05 31.7N 104.4W ML=2.0 EMSC WESTERN TEXAS
O: 02SEP2021 09:37:00 31.7N 104.0W ML=2.4 EMSC WESTERN TEXAS
O: 02SEP2021 12:20:45 31.7N 104.4W ML=2.1 EMSC WESTERN TEXAS
O: 03SEP2021 00:42:59 31.7N 104.4W ML=3.4 EMSC WESTERN TEXAS
O: 03SEP2021 01:31:49 31.7N 104.4W ML=3.0 EMSC WESTERN TEXAS
O: 03SEP2021 05:41:14 31.7N 104.4W ML=4.2 EMSC WESTERN TEXAS
O: 03SEP2021 05:45:49 31.7N 104.4W ML=2.8 EMSC WESTERN TEXAS
O: 3SEP2021 06:29:06 31.7N 104.4W ML=2.6 EMSC WESTERN TEXAS
P: 3SEP2021 136827 32.5N 104.6W 2.0-3.9 AAAAA SW U.S.A
OTHER GLOBAL EARTHQUAKE ACTIVITY
For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range. This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's.
ASIA
O: 2SEP2021 10:57:02 23.2N 120.6E mb=4.3 EMSC TAIWAN
P: 6SEP2021 136791 23.0N 123.0E 4.0-5.4 BABAA Taiwan
NEIC reported this earthquake of M 4.3 in Taiwan was felt with intensity V in the area(s) of Taiwan at Chichi, Nantou.
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 2SEP2021 09:34:18 0.5N 99.2E ML=3.9 EMSC NORTHERN SUMATRA, INDONESIA
P: 2SEP2021 136722 0.0N 98.0E 4.0-5.4 AABAA So. Sumatera
O: 2SEP2021 14:15:56 4.7S 102.5E mb=4.6 EMSC SOUTHERN SUMATRA, INDONESIA
P: 1SEP2021 136739 6.0S 104.0E 4.0-5.6 ABBAA So. of Sumatera
O: 2SEP2021 07:23:32 11.6N 124.4E mb=4.7 EMSC LEYTE, PHILIPPINES
P: 24AUG2021 136481 12.0N 124.0E 3.5-5.2 CAAAA Luzon, Philippines
NEIC reported this earthquake of M 4.7 in Leyte, Philippines was felt with intensity II-III in the area(s) of Leyte, Philippines with VI in Almeria, Eastern Visayas and Leyte and San Antonio iBasey.
No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.
CENTRAL AND SOUTH AMERICA
O: 2SEP2021 20:34:47 2.1S 77.7W ML=4.3 EMSC PERU-ECUADOR BORDER REGION
P: 5SEP2021 136728 1.0S 78.0W 4.0-5.8 BBAAA Ecuador
O: 2SEP2021 08:42:17 3.8S 76.3W Mw=4.9 EMSC NORTHERN PERU
P: 31AUG2021 136450 4.0S 80.0W 4.0-5.5 AACAA Ecuador
O: 3SEP2021 01:25:51 13.3N 89.7W mb=4.4 EMSC OFFSHORE EL SALVADOR
P: 7SEP2021 136751 14.0N 90.0W 3.5-5.3 BAAAA Guatemala
NEIC reported this earthquake of M 4.4 in El Salvador was felt with intensity II-III in the area(s) of El Salvador at Antiguo Cuscatlan, La Libertad.
O: 3SEP2021 05:06:22 14.4S 76.5W Mw=5.0 EMSC NEAR COAST OF CENTRAL PERU
P: 31AUG2021 136663 15.0S 76.0W 4.0-5.4 BAAAA Central Peru
O: 2SEP2021 14:41:33 15.1N 93.3W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO
P: 5SEP2021 136746 15.0N 94.0W 3.5-5.1 BAAAA Chiapas, Mexico
O: 3SEP2021 03:19:26 16.7N 94.0W ML=4.1 EMSC CHIAPAS, MEXICO
P: 4SEP2021 136747 17.0N 95.0W 3.5-5.5 AAAAA Chiapas, Mexico
O: 3SEP2021 01:32:42 17.0N 100.1W ML=4.0 EMSC OFFSHORE GUERRERO, MEXICO
P: 4SEP2021 136767 17.0N 100.0W 3.5-5.5 AAAAA Oaxaca, Mexico
O: 2SEP2021 11:44:24 17.3N 95.1W ML=4.1 EMSC OAXACA, MEXICO
O: 2SEP2021 07:42:49 17.4N 94.9W ML=4.0 EMSC VERACRUZ, MEXICO
P: 4SEP2021 136747 17.0N 95.0W 3.5-5.5 AAAAA Chiapas, Mexico
O: 3SEP2021 02:45:46 17.9N 66.9W Md=3.0 EMSC PUERTO RICO REGION
P: 4SEP2021 136768 18.0N 66.0W 3.4-5.5 AAAAA Puerto Rico
O: 2SEP2021 07:33:03 18.5N 73.6W ML=3.2 EMSC HAITI REGION
P: 7SEP2021 136771 19.0N 74.0W 3.4-5.3 BAAAA Puerto Rico
O: 2SEP2021 19:36:30 19.6N 70.7W ML=3.0 EMSC DOMINICAN REPUBLIC
P: 5SEP2021 136771 19.0N 71.0W 3.4-5.3 BAAAA Puerto Rico
O: 3SEP2021 00:37:46 27.1N 108.4W ML=4.0 EMSC CHIHUAHUA, MEXICO
P: 29AUG2021 136501 24.0N 109.0W 3.5-4.9 BCAAA Gulf of California
P: 29AUG2021 136502 28.0N 112.0W 3.5-4.9 BACAA Gulf of California
O: 2SEP2021 15:25:06 32.1S 72.8W mb=4.7 EMSC OFF COAST OF VALPARAISO, CHILE
P: 5SEP2021 136948 33.0S 72.0W 4.0-5.6 BAAAA Central Chile
AFRICA AND EUROPE
O: 2SEP2021 21:12:52 36.4N 27.1E ML=4.1 EMSC DODECANESE IS.-TURKEY BORDER R
P: 28AUG2021 136516 37.0N 27.0E 3.0-4.8 BAAAA Aegean Sea
P: 28AUG2021 136578 36.0N 28.0E 3.5-5.3 BAAAA Turkey
O: 3SEP2021 03:34:49 42.4N 46.1E mb=4.8 EMSC CAUCASUS REGION, RUSSIA
P: 3SEP2021 136846 38.0N 44.0E 3.5-5.0 ACBAA Turkey
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.
OCEAN RIDGES
O: 03SEP2021 05:40:10 24.5S 116.1W mb=4.8 EMSC SOUTHERN EAST PACIFIC RISE
O: 3SEP2021 05:22:57 24.3S 116.0W Mw=5.4 EMSC SOUTHERN EAST PACIFIC RISE
P: 8SEP2021 136940 24.0S 115.0W 4.0-5.6 BAAAA So. East Pacific Rise
O: 2SEP2021 17:58:55 60.4S 48.8W mb=4.7 EMSC SCOTIA SEA
O: 2SEP2021 14:17:56 42.0N 29.4W mb=4.6 EMSC AZORES ISLANDS REGION
P: 8SEP2021 136869 41.0N 30.0W 4.0-5.8 CAAAA No. Mid-Atlantic Ridge
O: 02SEP2021 08:47:25 58.9S 25.5W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
O: 02SEP2021 12:01:52 59.2S 24.9W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
O: 03SEP2021 00:56:41 59.4S 25.7W mb=4.7 EMSC SOUTH SANDWICH ISLANDS REGION
O: 3SEP2021 00:06:16 58.8S 25.8W Mw=5.6 EMSC SOUTH SANDWICH ISLANDS REGION
P: 7SEP2021 136964 59.0S 26.0W 4.0-5.6 BAAAA So. Sandwich Islands
ZEALANDIA AND AUSTRALIA REGION
O: 2SEP2021 23:20:19 30.2S 177.0W mb=5.2 EMSC KERMADEC ISLANDS, NEW ZEALAND
P: 9SEP2021 136955 31.0S 177.0W 4.0-5.4 CAAAA So. Kermadec Islands
O: 2SEP2021 22:18:35 31.4S 177.6E mb=4.4 EMSC NORTH OF NEW ZEALAND
P: 7SEP2021 136955 32.0S 179.0E 4.0-5.4 BAAAA So. Kermadec Islands
O: 2SEP2021 19:24:52 37.1S 178.3E ML=4.5 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 8SEP2021 136953 37.0S 178.0E 3.0-4.6 CAAAA North Island, N.Z.
JAPAN AND KURIL ISLANDS
O: 2SEP2021 13:51:30 33.9N 139.4E ML=4.1 EMSC IZU ISLANDS, JAPAN REGION
P: 3SEP2021 136820 35.0N 139.0E 3.5-5.0 ABAAA No. Honshu, Japan
O: 2SEP2021 19:03:48 39.5N 144.7E mb=4.5 EMSC OFF EAST COAST OF HONSHU, JAPA
P: 2SEP2021 136841 38.0N 145.0E 4.0-5.4 ABAAA So. of Honshu
O: 2SEP2021 20:26:14 50.5N 150.5E Mw=5.2 EMSC NORTHWEST OF KURIL ISLANDS
P: 29AUG2021 136640 50.0N 148.0E 4.0-5.4 BABAA Sakhalin
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 02SEP2021 09:06:41 33.2N 115.6W Ml=2.1 EMSC SOUTHERN CALIFORNIA
O: 02SEP2021 09:08:55 33.2N 115.6W Ml=2.2 EMSC SOUTHERN CALIFORNIA
O: 2SEP2021 09:05:37 33.2N 115.6W Ml=2.1 EMSC SOUTHERN CALIFORNIA
P: 5SEP2021 136831 32.9N 115.6W 2.5-4.8 BAAAA So. California
O: 2SEP2021 17:30:19 34.0N 118.8W Ml=2.0 EMSC CHANNEL ISLANDS REG., CALIFORN
P: 5SEP2021 136834 34.3N 118.5W 2.5-4.5 BAAAA So. California
O: 2SEP2021 16:20:46 38.7N 119.0W ml=2.1 EMSC NEVADA
P: 4SEP2021 136801 38.3N 119.3W 2.5-4.5 AAAAA California/Nevada area
O: 3SEP2021 05:44:20 39.1N 123.2W Mw=3.8 EMSC NORTHERN CALIFORNIA
P: 7SEP2021 136807 39.0N 123.1W 2.5-4.4 BAAAA Central California
NEIC reported this earthquake of M 3.8 in Northern California was felt with intensity II-III in the area(s) of Northern California at Ukiah, Lakeport, Upper Lake, Hopland, Redwood Valley, Nice, Boonville, Potter Valley, Philo, and Gualala.
O: 2SEP2021 12:33:23 39.6N 119.5W ml=2.0 EMSC NEVADA
P: 1SEP2021 136801 39.1N 119.6W 2.5-4.6 AAAAA California/Nevada area
O: 3SEP2021 04:54:20 40.0N 120.5W ML=2.5 EMSC NORTHERN CALIFORNIA
P: 5SEP2021 136808 39.8N 120.6W 2.5-4.6 AAAAA Central California
NEIC reported this earthquake of M 2.5 in Northern California was felt with intensity II-III in the area(s) of Northern California at Portola, Sierra City and Quincy.
O: 2SEP2021 23:59:48 40.3N 124.4W Md=2.2 EMSC NORTHERN CALIFORNIA
P: 31AUG2021 136608 40.2N 124.2W 2.5-4.4 AAAAA Off Coast of No. Calif
ALASKA
O: 3SEP2021 03:55:44 53.5N 163.6W mb=4.7 EMSC UNIMAK ISLAND REGION, ALASKA
P: 2SEP2021 136908 54.6N 163.6W 3.5-5.0 ABAAA Unimak Islands, Aleutians
O: 2SEP2021 08:08:34 54.5N 159.7W mb=4.6 EMSC SOUTH OF ALASKA
P: 2SEP2021 136890 54.7N 156.9W 3.5-5.1 AABAA Alaska Peninsula
O: 2SEP2021 13:37:42 55.1N 157.7W ML=3.9 EMSC ALASKA PENINSULA
P: 2SEP2021 136890 54.7N 156.9W 3.5-5.1 AAAAA Alaska Peninsula
O: 3SEP2021 04:15:56 63.9N 150.4W ML=3.1 EMSC CENTRAL ALASKA
P: 5SEP2021 136914 63.0N 151.5W 3.2-5.3 AAAAA Central Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 3SEP2021 04:20:10 43.4N 126.6W ML=3.0 EMSC OFF COAST OF OREGON
P: 2SEP2021 136875 44.3N 127.4W 3.0-4.8 AAAAA Off Coast of Oregon
O: 2SEP2021 07:49:15 49.3N 124.0W Ml=2.0 EMSC VANCOUVER ISLAND, CANADA REGIO
P: 7SEP2021 136888 49.0N 123.0W 2.0-4.4 BAAAA Washington state, U.S.
ROCKY MOUNTAINS REGION
O: 02SEP2021 07:23:05 31.7N 104.4W ML=2.0 EMSC WESTERN TEXAS
O: 02SEP2021 09:37:00 31.7N 104.0W ML=2.4 EMSC WESTERN TEXAS
O: 02SEP2021 12:20:45 31.7N 104.4W ML=2.1 EMSC WESTERN TEXAS
O: 03SEP2021 00:42:59 31.7N 104.4W ML=3.4 EMSC WESTERN TEXAS
O: 03SEP2021 01:31:49 31.7N 104.4W ML=3.0 EMSC WESTERN TEXAS
O: 03SEP2021 05:41:14 31.7N 104.4W ML=4.2 EMSC WESTERN TEXAS
O: 03SEP2021 05:45:49 31.7N 104.4W ML=2.8 EMSC WESTERN TEXAS
O: 3SEP2021 06:29:06 31.7N 104.4W ML=2.6 EMSC WESTERN TEXAS
P: 3SEP2021 136827 32.5N 104.6W 2.0-3.9 AAAAA SW U.S.A
O: 3SEP2021 06:22:38 32.1N 102.1W mb=2.4 EMSC WESTERN TEXAS
P: 6SEP2021 136827 31.6N 103.6W 2.0-3.9 BABAA SW U.S.A
EASTERN U.S./CANADA
O: 01SEP2021 19:08:11 72.0N 75.0W MB=2.3 ECAN Pond Inlet, NU
O: 01SEP2021 14:14:24 72.0N 75.1W MB=2.3 ECAN Pond Inlet, NU
O: 01SEP2021 10:18:13 72.0N 75.2W MB=1.9 ECAN Pond Inlet, NU
O: 01SEP2021 09:49:07 72.0N 75.2W MB=3.3 ECAN Pond Inlet, NU
O: 1SEP2021 09:03:01 70.0N 71.7W MB=2.4 ECAN Clyde River, NU
O: 1SEP2021 13:39:02 47.5N 70.2W MB=1.1 ECAN Charlevoix Seismic Zone
P: 3SEP2021 136866 47.3N 70.5W 2.0-4.1 AAAAA New England
O: 1SEP2021 11:21:37 73.6N 93.7W MB=1.5 ECAN Resolute, NU
O: 1SEP2021 09:29:17 51.1N 64.4W MB=1.8 ECAN Mingan, QC
P: 29AUG2021 136591 49.0N 66.0W 2.0-3.9 ACAAA E. of Maine
O: 2SEP2021 19:24:18 36.4N 98.2W ML=2.1 EMSC OKLAHOMA
P: 31AUG2021 136576 37.0N 98.0W 2.0-4.3 AAAAA Southern Plains
O: 2SEP2021 13:27:23 36.5N 99.0W ML=2.1 EMSC OKLAHOMA
P: 9SEP2021 136843 36.0N 99.0W 2.0-4.4 CAAAA Southern Plains
HAWAII
No earthquakes of M>=3 were located in Hawaii.
MODERATE QUAKE SHAKES ROMANIA
EARTHQUAKE SUMMARY FOR SEPTEMBER 1, 2021
An earthquake of M 4.4 in Romania today was widely felt. NEIC reported this earthquake of M 4.4 in Romania was felt with intensity II-III in the area(s) of Romania at Stantu (VI); Pocsani, Galati, Bucherest (V) and IV in Brasov, Ploesti, Iasi and in Chiainau, Moldavia. Similar earthquakes of M 4.4 have shook Romania in the past year on August 11, 2021; April 9, 2021 and October 29, 2020 but the last of larger magnitude in Romania was an M 4.9 on April 24, 2020. Forecast 136615 had expected today's event was likely at the end of August within about 50 km of this epicenter.
O: 1SEP2021 10:32:11 45.7N 26.5E mb=4.4 EMSC ROMANIA
P: 29AUG2021 136615 46.0N 27.0E 3.0-4.9 AAAAA Romania/NW Turkey
A moderate M 5.6-5.8 was felt in the area of Atacama, Chile today. NEIC reported this earthquake of M 5.6 in Atacama, Chile was felt with intensity II-III in the area(s) of Atacama, Chile at Copiapo (VI), Diego de Almagro (IV); and Vina del Mar, Quilpue, Valparaiso and Santiago, Chile. GUC reported this earthquake was felt with intensity III in Tarapaca at Alto Hospicio and Iquique and in Antofagasta with III in Quillagua, Chile. This is the strongest earthquake in the area of Atacama within about 200 km of this epicenter since an M 6.0 about 150 km southwest of this on July 4, 2021. The last such event closer to this epicenter was an M 6.8 and aftershocks on September 1, 2020 exactly one year ago. Today's event may be an aftershock of that earthquake. Aftershocks at one year after mainshocks are statistically more likely than at other times and may be related to local weather conditions or ocean or atmospheric loading. Forecasts 136678, 136679 and 136936 had expected enhanced seismicity in this area of Chile was likely at the end of August or in early September. This epicenter is located near 103 degrees from the M 7.1 in Vanuatu of August 18 and was probably promoted by energy from that source. Other events at this distance from Vanuatu today occurred as an M 5.6 in the South Sandwich Islands, Oacaxa and Guerrero, Mexico, Texas, Afghanistan.
O: 1SEP2021 18:36 27.7S 71.1W mb=5.8 GUC Tarapaca at Alto Hospicio and
O: 1SEP2021 18:35:44 27.7S 71.2W Mw=5.6 EMSC OFFSHORE ATACAMA, CHILE
P: 26AUG2021 136679 28.0S 71.0W 4.0-5.4 BAAAA Coast Central Chile
P: 30AUG2021 136678 28.0S 68.0W 4.0-5.5 AACAA Argentina
P: 4SEP2021 136936 29.0S 72.0W 4.0-5.5 BBAAA Coast Central Chile
Moderately strong earthquakes occurred today in the Central Mid-Atlantic Ridge. These events were not reported felt in these remote areas. They occurred as Hurricane Larry was forming to the north and may have been promoted by energy from that storm as noted in this summary:
"Hurricane Larry formed today in the mid-Atlantic with winds up to 75 kts. It is expected to track to the west over the next week but not to make landfall. Some minor seismic enhancement in the Virgin Islands may occur around September 6-9." (September 1, 2021)
Both of these occurred near local solar noon or midnight and were probably promoted by strong tidal stresses at this hour. The largest was an M 5.7 within minutes of local solar noon in the central Mid-Atlantic. This is the largest quake in the world today. The last earthquake within about 250 km of this epicenter with M>=5.7 was an M 6.5 on November 30, 2017. Forecast 136448 had expected today's event was likely within about 25 km of this epicenter at the end of August or early September. This activity is at 142 - 144 degrees from strong shocks in the Kermadec Islands (M 8.1, March 4) and Mindanao, Philippines (M 7.1, August 11) and at the sixth and seventh nodes (60 and 52 degrees) and may have been promoted by strong seismic energy from those sources.
O: 1SEP2021 13:50:13 1.1S 24.3W Mw=5.7 EMSC CENTRAL MID-ATLANTIC RIDGE
P: 28AUG2021 136448 1.0S 24.0W 4.0-5.6 BAAAA Central Mid-Atlantic
An M 5.3 also occurred to the east of the M 5.7 in the area of the Atlantic north of Ascension Island. A similar M 5.3 hit within about 250 km of this epicenter on June 6, 2021 but the last event of larger magnitude in this area was an M 6.3 about 200 km to the east on October 23, 2019. Forecast 136726 had expected this event within about 100 km was likely around September 3.
O: 1SEP2021 22:51:35 1.6S 15.5W Mw=5.3 EMSC NORTH OF ASCENSION ISLAND
P: 3SEP2021 136726 1.0S 16.0W 4.0-5.4 AAAAA Central Mid-Atlantic
An earthquake of M 5.0 in Afghanistan today continues a series of moderate quakes in the area over the past week. NEIC reported this earthquake of M 5.0 in Afghanistan was felt with intensity II-III in the area(s) of Tajikistan at Boshkengash. It is at 103 degrees from the M 7.1 in Vanuatu of August 18 and may have been promoted by energy from that source. Forecast 136812 had expected enhanced seismicity in this area of Hindu Kush was likely around September 2.
O: 2SEP2021 04:50:06 37.5N 70.3E mb=5.0 EMSC HINDU KUSH REGION, AFGHANISTAN
P: 2SEP2021 136812 36.0N 71.0E 3.8-5.5 ABAAA Hindu Kush/Pakistan
The strongest earthquakes in the world today again occurred in the South Sandwich Islands with events of M 5.6, 5.1, 5.0 and 4.9 recorded. These events were not reported felt in this remote area. These continue almost daily aftershocks at this magnitude level since the mainshock of M 8.1 on August 12, 2021. Forecast 136964 had expected this activity in early September within about 25 km of today's activity.
O: 01SEP2021 10:02:18 59.0S 25.6W mb=5.1 EMSC SOUTH SANDWICH ISLANDS REGION
O: 02SEP2021 06:05:17 59.0S 25.6W mb=5.0 EMSC SOUTH SANDWICH ISLANDS REGION
O: 02SEP2021 06:17:16 59.0S 25.5W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
O: 1SEP2021 09:01:14 59.1S 25.7W Mw=5.6 EMSC SOUTH SANDWICH ISLANDS REGION
P: 7SEP2021 136964 59.0S 26.0W 4.0-5.6 CAAAA So. Sandwich Islands
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: 2SEP2021 04:50:06 37.5N 70.3E mb=5.0 EMSC HINDU KUSH REGION, AFGHANISTAN
P: 2SEP2021 136812 36.0N 71.0E 3.8-5.5 ABAAA Hindu Kush/Pakistan
INDONESIA AND PHILIPPINES
O: 1SEP2021 13:40:39 0.1S 123.9E ML=4.5 EMSC SULAWESI, INDONESIA
P: 3SEP2021 136713 0.0N 122.0E 4.0-5.6 AABAA Celebes Sea
P: 5SEP2021 136719 0.0N 123.0E 4.0-5.5 BAAAA Mindanao, Philippines
O: 1SEP2021 16:53:54 2.8S 138.7E ML=4.2 EMSC PAPUA, INDONESIA
P: 31AUG2021 136468 2.0S 139.0E 4.0-5.4 AAAAA West Irian, PNG
O: 1SEP2021 07:36:09 6.2S 130.6E mb=4.5 EMSC BANDA SEA
P: 25AUG2021 136446 7.0S 130.0E 4.0-5.4 CAAAA Banda Sea
No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.
CENTRAL AND SOUTH AMERICA
O: 1SEP2021 21:21:52 4.9S 80.8W ML=4.2 EMSC PERU-ECUADOR BORDER REGION
P: 31AUG2021 136450 4.0S 80.0W 4.0-5.5 AAAAA Ecuador
O: 1SEP2021 16:50:30 9.1N 83.7W ML=4.1 EMSC COSTA RICA
P: 2SEP2021 136745 10.0N 84.0W 3.5-5.1 AAAAA Caribbean Sea
O: 1SEP2021 08:57:40 15.4N 94.8W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO
P: 30AUG2021 136473 16.0N 95.0W 3.5-5.1 AAAAA Chiapas, Mexico
O: 01SEP2021 09:33:55 18.4N 73.6W ML=3.4 EMSC HAITI REGION
O: 01SEP2021 07:24:28 18.5N 73.8W ML=3.2 EMSC HAITI REGION
O: 1SEP2021 09:19:57 18.4N 73.7W ML=3.3 EMSC HAITI REGION
P: 7SEP2021 136771 19.0N 74.0W 3.4-5.3 CAAAA Puerto Rico
O: 2SEP2021 05:32:26 19.6N 67.5W Md=3.9 EMSC PUERTO RICO REGION
P: 4SEP2021 136770 19.0N 68.0W 3.4-5.2 AAAAA Puerto Rico
O: 2SEP2021 00:16:36 19.7N 71.5W ML=3.1 EMSC DOMINICAN REPUBLIC
P: 31AUG2021 136499 20.0N 71.0W 3.0-4.6 AAAAA Bahamas/No. Caribbean
O: 1SEP2021 12:52:52 24.3S 67.5W mb=4.2 EMSC SALTA, ARGENTINA
P: 28AUG2021 136677 23.0S 66.0W 4.0-5.6 BBBAA Argentina
O: 1SEP2021 18:35:44 27.7S 71.2W Mw=5.6 EMSC OFFSHORE ATACAMA, CHILE
O: 1SEP2021 18:36 27.7S 71.1W mb=5.8 GUC Tarapaca at Alto Hospicio and
P: 26AUG2021 136679 28.0S 71.0W 4.0-5.4 BAAAA Coast Central Chile
P: 30AUG2021 136678 28.0S 68.0W 4.0-5.5 AACAA Argentina
P: 4SEP2021 136936 29.0S 72.0W 4.0-5.5 BBAAA Coast Central Chile
AFRICA AND EUROPE
O: 2SEP2021 05:48:37 38.3N 23.3E ML=4.1 EMSC GREECE
P: 26AUG2021 136614 40.0N 21.0E 3.0-5.1 CBBAA Romania/NW Turkey
O: 1SEP2021 10:32:11 45.7N 26.5E mb=4.4 EMSC ROMANIA
P: 29AUG2021 136615 46.0N 27.0E 3.0-4.9 AAAAA Romania/NW Turkey
No significant (M>=5) or unusual earthquakes were reported in Europe today.
SOUTHWEST PACIFIC
O: 1SEP2021 08:21:05 18.7S 174.1W Mw=5.2 EMSC TONGA
P: 26AUG2021 136674 19.0S 176.0W 4.0-5.7 CABAA Tonga Islands
NEIC reported this earthquake of M 5.2 in Tonga was felt with intensity II-III in the area(s) of Tonga at Neiafu.
O: 1SEP2021 17:13:20 24.3S 179.9W mb=4.6 EMSC SOUTH OF FIJI ISLANDS
P: 2SEP2021 136945 24.0S 177.0W 4.0-5.8 AABAA Tonga Islands
P: 9SEP2021 136945 25.0S 180.0W 4.0-5.4 CAAAA Tonga Islands
OCEAN RIDGES
O: 1SEP2021 13:50:13 1.1S 24.3W Mw=5.7 EMSC CENTRAL MID-ATLANTIC RIDGE
P: 28AUG2021 136448 1.0S 24.0W 4.0-5.6 BAAAA Central Mid-Atlantic
O: 1SEP2021 22:51:35 1.6S 15.5W Mw=5.3 EMSC NORTH OF ASCENSION ISLAND
P: 3SEP2021 136726 1.0S 16.0W 4.0-5.4 AAAAA Central Mid-Atlantic
O: 1SEP2021 07:11:31 42.7S 82.4W mb=4.9 EMSC WEST CHILE RISE
P: 24AUG2021 136701 43.0S 83.0W 4.0-5.6 CAAAA Chile Rise
O: 01SEP2021 10:02:18 59.0S 25.6W mb=5.1 EMSC SOUTH SANDWICH ISLANDS REGION
O: 02SEP2021 06:05:17 59.0S 25.6W mb=5.0 EMSC SOUTH SANDWICH ISLANDS REGION
O: 02SEP2021 06:17:16 59.0S 25.5W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION
O: 1SEP2021 09:01:14 59.1S 25.7W Mw=5.6 EMSC SOUTH SANDWICH ISLANDS REGION
P: 7SEP2021 136964 59.0S 26.0W 4.0-5.6 CAAAA So. Sandwich Islands
ZEALANDIA AND AUSTRALIA REGION
O: 1SEP2021 21:09:22 31.9S 179.7E ML=4.1 EMSC KERMADEC ISLANDS REGION
P: 7SEP2021 136955 32.0S 179.0E 4.0-5.4 CAAAA So. Kermadec Islands
O: 1SEP2021 12:23:14 33.2S 180.0E ML=4.3 EMSC SOUTH OF KERMADEC ISLANDS
O: 1SEP2021 08:10:21 33.4S 179.0E ML=4.2 EMSC SOUTH OF KERMADEC ISLANDS
P: 29AUG2021 136700 34.0S 179.0E 4.0-5.5 AAAAA So. Kermadec Islands
O: 1SEP2021 22:49:54 37.7S 179.7E ML=4.0 EMSC OFF E. COAST OF N. ISLAND, N.Z
P: 8SEP2021 136953 37.0S 178.0E 3.0-4.6 CABAA North Island, N.Z.
JAPAN AND KURIL ISLANDS
O: 01SEP2021 19:17:07 37.7N 141.6E mb=4.6 EMSC NEAR EAST COAST OF HONSHU, JAPAN
O: 1SEP2021 08:16:41 37.7N 141.8E mb=4.3 EMSC NEAR EAST COAST OF HONSHU, JAP
P: 2SEP2021 136825 38.0N 142.0E 4.0-5.5 AAAAA Off East Coast Honshu
O: 1SEP2021 23:46:06 41.5N 142.1E mb=4.2 EMSC HOKKAIDO, JAPAN REGION
P: 8SEP2021 136856 42.0N 143.0E 3.5-5.5 CAAAA Hokkaido, Japan
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 1SEP2021 20:55:21 31.2N 115.6W ML=3.0 EMSC BAJA CALIFORNIA, MEXICO
O: 1SEP2021 08:43:08 31.8N 115.9W ML=3.3 EMSC BAJA CALIFORNIA, MEXICO
P: 29AUG2021 136560 32.1N 116.4W 2.5-4.9 AAAAA So. California
O: 1SEP2021 13:00:43 33.8N 116.1W Ml=2.1 EMSC SOUTHERN CALIFORNIA
P: 27AUG2021 136566 33.9N 116.9W 2.5-4.8 BAAAA So. California
O: 1SEP2021 09:21:13 35.1N 119.1W Ml=2.4 EMSC CENTRAL CALIFORNIA
P: 29AUG2021 136567 34.9N 119.0W 2.5-4.4 AAAAA So. California
O: 1SEP2021 22:58:33 36.5N 118.0W Ml=2.1 EMSC CENTRAL CALIFORNIA
P: 2SEP2021 136797 37.1N 117.8W 2.5-4.8 AAAAA California/Nevada area
O: 1SEP2021 13:14:28 36.5N 121.1W Md=2.2 EMSC CENTRAL CALIFORNIA
P: 3SEP2021 136803 36.4N 121.0W 2.5-4.6 AAAAA Central California
O: 1SEP2021 23:13:35 37.6N 121.8W Md=2.6 EMSC SAN FRANCISCO BAY AREA, CALIF.
P: 5SEP2021 136805 37.4N 121.8W 2.5-4.4 BAAAA Central California
NEIC reported this earthquake of M 2.6 in Central California was felt with intensity II-III in the area(s) of Central California at Pleasantn, Livermore, Dublin, San Ramon, Danville, Antioch, Oakland and Berkeley.
O: 1SEP2021 17:51:54 38.1N 118.8W ml=2.2 EMSC CENTRAL CALIFORNIA
P: 28AUG2021 136522 38.4N 118.7W 2.5-4.7 BAAAA California/Nevada area
O: 1SEP2021 18:54:28 38.5N 119.5W ml=2.3 EMSC CENTRAL CALIFORNIA
P: 2SEP2021 136801 38.8N 119.6W 2.5-4.5 AAAAA California/Nevada area
O: 1SEP2021 20:35:04 40.6N 115.2W ml=3.0 EMSC NEVADA
O: 01SEP2021 16:23:31 40.9N 115.1W ml=2.3 EMSC NEVADA
P: 2SEP2021 136854 40.2N 114.6W 2.5-4.7 AAAAA California/Nevada area
ALASKA
O: 2SEP2021 03:40:47 57.9N 155.3W ML=3.6 EMSC ALASKA PENINSULA
P: 2SEP2021 136890 54.7N 156.9W 3.5-5.1 ACAAA Alaska Peninsula
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
No events of M>=2 were located in the northwestern U.S. or western Canada today.
ROCKY MOUNTAINS REGION
O: 1SEP2021 11:10:33 31.6N 104.0W ML=2.1 EMSC WESTERN TEXAS
O: 01SEP2021 07:19:23 32.2N 103.1W ML=2.5 EMSC NEW MEXICO
O: 01SEP2021 08:54:10 32.2N 103.1W ML=2.0 EMSC NEW MEXICO
P: 3SEP2021 136827 32.5N 104.6W 2.0-3.9 AAAAA SW U.S.A
O: 1SEP2021 08:03:03 31.9N 101.8W ML=2.1 EMSC WESTERN TEXAS
P: 6SEP2021 136827 31.6N 103.6W 2.0-3.9 BABAA SW U.S.A
O: 1SEP2021 20:23:38 39.4N 110.3W ML=2.3 EMSC UTAH
P: 30AUG2021 136582 39.7N 110.8W 2.0-4.4 AAAAA Utah area
O: 01SEP2021 16:30:37 44.4N 115.2W Ml=2.3 EMSC SOUTHERN IDAHO
O: 1SEP2021 22:07:40 44.3N 115.2W ML=2.5 EMSC SOUTHERN IDAHO
P: 2SEP2021 136862 44.4N 115.1W 2.0-4.0 AAAAA Montana/Idaho
EASTERN U.S., CANADA
O: 1SEP2021 11:09:59 28.9N 98.4W ML=2.0 EMSC SOUTHERN TEXAS
P: 1SEP2021 136785 29.0N 99.0W 3.0-4.9 AAAAA Northern Mexico
O: 1SEP2021 07:13:59 33.9N 96.8W ML=2.1 EMSC OKLAHOMA
P: 2SEP2021 136843 35.0N 97.0W 2.0-4.3 ABAAA Southern Plains
O: 1SEP2021 15:26:02 35.1N 95.3W mb=2.7 EMSC OKLAHOMA
P: 2SEP2021 136843 35.0N 97.0W 2.0-4.3 AABAA Southern Plains
O: 01SEP2021 18:02:01 36.5N 99.0W ML=2.0 EMSC OKLAHOMA
O: 1SEP2021 18:52:36 36.5N 99.0W mb=2.7 EMSC OKLAHOMA
P: 31AUG2021 136576 37.0N 98.0W 2.0-4.3 AAAAA Southern Plains
O: 1SEP2021 09:49:07 72.0N 75.2W ML=3.3 EMSC BAFFIN ISLAND REGION, CANADA
HAWAII
No earthquakes of M>=3 were located in Hawaii.
SEISMICITY IN WESTERN U.S. UP FOLLOWING HURRICANE IDA LANDFALL
EARTHQUAKE SUMMARY FOR AUGUST 31, 2021
A series of unusual, moderate earthquakes were felt in California and Nevada today following an M 4.4 off the coast of Oregon yesterday. These were concentrated in northern and central California and Nevada with the largest an M 4.7 in northern Nevada. Other moderate regional events occurred in the area south of San Francisco in the Paicines area and off the coast of Northern California with M 4.0 and 4.2. This may be related to landfall of Hurricane Ida on the coast of Louisiana over the past two days - one of the strongest hurricanes to make landfall in the U.S. in several hundred years. This summary noted this hurricane in previous issues as:
"Hurricane Ida continued over Kentucky today with winds up to 30 kts. It made landfall today with winds up to 160 kts, a category 4 hurricane, one of the strongest ever to make landfall in the U.S. Much damage occurred in southern Louisiana but only one death was initially reported. It is expected to track to the north into Tennessee August 30-31 as a category 2 hurricane. Seismicity in Guatemala and Honduras is likely to remain high due to atmospheric downloading with the low pressures in Ida. A further moderate quake in this region is possible in the next several days. Regional seismicity in the southeastern U.S. may be enhanced with landfall in the next two days. A light M 2.7 in Tennessee near the eye of Ida today may have been promoted by loading effects with this storm. Damage is currently estimated at $200 billion." (August 29-31, 2021)
A moderate earthquake of M 4.7 was felt in northeastern Nevada today. This was the strongest event in the U.S. or Canada today. NEIC reported maximum intensity V in Jackpot, Nevada and IV in Deeth and Well with II-III in Spring Creek, Elko, Carlin, Crescent Valley, Ely, Battle Mountain and Eureka, Nevada. The only earthquakes of equal or greater magnitude within about 100 km of this epicenter
during the past 30 years was an M 6.0 on February 21, 2008 and prior to that an M 4.7 on November 23, 2003. At the time of the event on February 21, 2008 - of which this is the strongest aftershock to date - this summary noted:
"NEIC reported that the earthquake in Nevada near Wells was felt with maximum intensity VI and caused damage in the area. It was felt throughout the Great Basin and Rocky Mountains area of the Unites States within about 1000 km of the epicenter.
... This is the strongest earthquake ever recorded by NEIC in this region of Nevada (39-42N 113-116W). UUSN scientists stated that no earthquake of this size had hit the region in the past 150 years. The historic district, largely unoccupied now, in Wells was heavily damaged. At least 20-25 buildings were heavily damaged according to reports from the area. Brick facades fell from several buildings and windows broke. Some vehicles were damaged by falling debris. The town's 140 years old brothel was badly damaged. Wells formed in the late 19th century as deep clear springs attracted travelers going west to California and has often been used in western and road movies. The historic district may need to be demolished after the quake according to local officials. All commercial establishments were closed. The town of Wells was closed to all but residents numbering more than 1000. At least three injures were reported. a broken arm, head lacerations and breathing difficulties. Two buildings partially collapsed and two water mains ruptured. Train traffic was temporarily suspended but schools continued. There were no problems found in underground gold mines in the region although 40 miners were underground at the time of the quake. More than two feet of snow in the area will hinder geological investigation until spring. While Nevada is the third most seismic state in the U.S. after Alaska and California, the University of Nevada reported just two days ago that the state had seen the third lowest seismic in recent history in the year 2007." (February 22, 2008)
This epicenter is at 106 degrees from the M 7.1 in Mindanao, Philippines of August 11, 2021 and was probably promoted by concentrated energy from that source. Forecasts 136854 and 136582 had expected seismic enhancement in this area at the end of August or early September within about 100 km of this epicenter.
O: 31AUG2021 17:21:10 41.0N 114.9W Mw=4.7 EMSC NEVADA
P: 2SEP2021 136854 40.2N 114.6W 2.5-4.7 AAAAA California/Nevada area
P: 30AUG2021 136582 39.6N 111.9W 2.0-4.4 ABBAA Utah area
The M 4.7 in Nevada followed an M 4.1 in the Pinnacles area of Central California. NEIC reported this event was felt with intensity IV in Paicines, Soledad, Greenfield and II-III in Gonzales, Hollister, Salnas, King City and San Juan Bautista, Central California. This is the strongest earthquake within about 50 km of this epicenter since an M 4.3 on January 2, 2021 and an M 4.7 on October 15, 2019. Forecasts 136526 and 136803 had expected today's event within about 25 km was likely between August 31 and September 3. This event is at 103 degrees from the M 7.1 in Mindanao of August 11, 2021 and was probably promoted by energy from that source.
O: 31AUG2021 16:09:55 36.6N 121.1W Mw=4.1 EMSC CENTRAL CALIFORNIA
P: 3SEP2021 136803 36.4N 121.0W 2.5-4.6 BAAAA Central California
P: 26AUG2021 136526 36.7N 121.4W 2.5-4.6 BAAAA Central California
An M 4.0 also occurred off the coast of Northern California earlier in the day. NEIC reported it was felt with intensity II-III in Whitethorn, Carberville, Leggett and Willits, California. Larger earthquakes in this area occurred on July 18 and July 21, 2021 with M 4.4 and M 5.1 and this may be an aftershock of those events. Forecast 136608 had expected today's activity within about 25 km was likely around August 31.
O: 31AUG2021 08:01:11 40.3N 124.4W ML=3.4 EMSC OFFSHORE NORTHERN CALIFORNIA
O: 31AUG2021 08:01:11 40.3N 124.4W ML=4.0 ANSS OFFSHORE NORTHERN CALIFORNIA
P: 31AUG2021 136608 40.2N 124.2W 2.5-4.4 AAAAA Off Coast of No. Calif
A moderate earthquake of M 5.4 was felt strongly in northern Vanuatu today. NEIC reported intensity VIII in Sola Torba, Vanuatu for this event. This may be a regional aftershock of an M 6.9-7.1 which occurred about 150 km to the south of this on August 18. Forecasts 136933 and 136676 had expected today's activity within about 50 km at the end of August.
O: 31AUG2021 13:26:58 13.7S 167.5E Mw=5.4 EMSC VANUATU
P: 2SEP2021 136933 13.0S 167.0E 4.0-5.4 AAAAA Vanuatu Islands
P: 28AUG2021 136676 14.0S 168.0E 4.0-5.4 BAAAA Vanuatu Islands
The strongest earthquakes in the world today occurred beneath the world's oceans. These included the strongest - an M 5.6 in the South Sandwich Islands; a series of events of M 4.7, 4.8 and 5.0 in the Northern Mid-Atlantic Ridge and an M 5.2 in the Scotia Sea west of the South Sandwich Islands. The activity in the northern mid-Atlantic Ridge is the strongest within about 150 km of that epicenter since an M 5.2 on October 29, 2016. It was possibly promoted by stresses associated with Tropical Storm Kate which is currently located to the southwest of this epicenter as noted in previous summaries:
"TS Kate continued today in the North Atlantic east of Florida with winds up to 35 kts." (August 31, 2021)
Forecasts 135783 and 136506 had expected this activity was likely at the end of August or in early September within about 100 km of these epicenters. This activity is at 142-144 degrees from the M 8.1 in the Kermadec Islands of March 4, 2021 and the M 7.1 in Mindanao, Philippines of August 11, 2021.
O: 31AUG2021 22:54:49 29.8N 42.7W mb=4.8 EMSC NORTHERN MID-ATLANTIC RIDGE
O: 31AUG2021 22:02:47 29.9N 42.8W mb=4.7 EMSC NORTHERN MID-ATLANTIC RIDGE
O: 31AUG2021 22:24:23 29.8N 42.7W mb=5.0 EMSC NORTHERN MID-ATLANTIC RIDGE
P: 4SEP2021 136783 29.0N 43.0W 4.0-5.5 BAAAA Mid-Atlantic Ridge
P: 26AUG2021 136506 29.0N 44.0W 4.0-5.5 BAAAA Mid-Atlantic Ridge
The M 5.6 in the South Sandwich Islands today continued similar activity on a nearly daily basis which has followed the M 8.1 of August 12. Forecast 136710 had expected today's event at the end of August.
O: 31AUG2021 14:24:27 57.0S 25.2W Mw=5.6 EMSC SOUTH SANDWICH ISLANDS REGION
P: 25AUG2021 136710 59.0S 26.0W 4.0-5.7 CBAAA So. Sandwich Islands
The earthquake of M 5.2 in the Scotia is the strongest in that region since an M 5.5 on April 14, 2018. An event of M 5.9 hit about 100 km to the northeast on May 6, 2017. Forecast 136712 had expected today's event within about 20 km east of today's epicenter around August 28. This event is at 102 degrees from the M 7.1 in Vanuatu August 18, 2021 and was probably promoted by energy from that source. Other activity in the world today near 103 degrees from the Vanuatu event was located southern Texas, Oaxaca, Mexico, the South Sandwich Islands.
O: 31AUG2021 22:40:28 61.2S 39.0W mb=5.2 EMSC SCOTIA SEA
P: 28AUG2021 136712 61.0S 34.0W 4.0-5.5 BABAA Southern Ocean
An unusual earthquake of M 5.1 was also felt in central Turkey today. NEIC reported maximum intensity V in Turkey at Insanye, Afyon and IV in Afyonkarahisar. This is the strongest earthquake within about 200 km of this epicenter since an 5.8 about 150 km to the southwest of this on August 8, 2019. Forecasts 136580 and 136606 had expected enhanced seismicity in this area was likely at the end of August.
O: 31AUG2021 11:04:26 39.0N 30.2E Mw=5.1 EMSC WESTERN TURKEY
P: 26AUG2021 136580 39.0N 28.0E 3.5-5.1 BABAA Turkey
P: 31AUG2021 136606 41.0N 31.0E 3.5-5.2 ABAAA No. Turkey/Black Sea
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: 31AUG2021 22:27:56 23.3N 120.7E ML=4.9 EMSC TAIWAN
O: 31AUG2021 22:27:56 23.3N 120.7E ML=4.9 TAI Hualien, Taiwan
P: 29AUG2021 136512 23.0N 123.0E 4.0-5.4 AABAA Taiwan
CWB reported this earthquake was felt with intensity IV in Chiayi, Kaohsiung, Tainan; II in Nantou, Taitung, Yunlin, Hualien, Changhua and I in Pingtung, Taichung, Miaoli and Penghu Counties, Taiwan.
O: 31AUG2021 07:09:05 54.7N 83.6E mb=4.3 EMSC SOUTHWESTERN SIBERIA, RUSSIA
O: 31AUG2021 22:36:17 55.9N 113.4E mb=4.3 EMSC BURYATIYA, RUSSIA
P: 2SEP2021 136906 50.0N 113.0E 3.0-4.5 ACAAA So. Siberia
O: 1SEP2021 04:14:19 56.3N 117.8E mb=4.0 EMSC CHITINSKAYA OBLAST', RUSSIA
P: 1SEP2021 136906 57.0N 121.0E 3.0-4.8 AABAA So. Siberia
No significant (M>=5) or unusual earthquakes were reported in Asia today.
INDONESIA AND PHILIPPINES
O: 31AUG2021 09:22:29 3.3S 134.0E ML=4.0 EMSC PAPUA, INDONESIA
P: 31AUG2021 136467 4.0S 135.0E 4.0-5.4 AAAAA West Irian, PNG
O: 31AUG2021 10:34:07 5.7S 128.6E mb=4.2 EMSC BANDA SEA
P: 28AUG2021 136445 6.0S 128.0E 4.0-5.5 BAAAA Banda Sea
O: 31AUG2021 22:26:06 7.1N 125.6E mb=4.5 EMSC MINDANAO, PHILIPPINES
P: 29AUG2021 136437 7.0N 124.0E 4.0-5.6 AABAA Central Philippines
NEIC reported this earthquake of M 4.5 in Mindanao, Philippines was felt with intensity II-III in the area(s) of Mindanao, Philippines at Davao, Bato, Canocotan and Balutakay.
O: 31AUG2021 20:13:02 10.0S 112.6E ML=4.0 EMSC SOUTH OF JAVA, INDONESIA
P: 29AUG2021 136460 9.0S 113.0E 4.0-5.8 AAAAA So. of Bali
O: 31AUG2021 15:26:58 11.5N 125.4E ML=4.6 EMSC SAMAR, PHILIPPINES
P: 2SEP2021 136754 10.0N 126.0E 3.5-5.1 ABAAA Luzon, Philippines
No significant (M>=5) or unusual earthquakes were reported in Indonesia or the Philippines today.
CENTRAL AND SOUTH AMERICA
O: 31AUG2021 11:36:33 3.4S 78.3W ML=4.4 EMSC PERU-ECUADOR BORDER REGION
O: 31AUG2021 09:11:07 3.3S 78.1W mb=4.7 EMSC PERU-ECUADOR BORDER REGION
P: 31AUG2021 136450 4.0S 80.0W 4.0-5.5 AABAA Ecuador
NEIC reported this earthquake of M 4.7 on the Peru-Ecuador border was felt with intensity II-III in the area(s) of the Peru-Ecuador border at Cuenca, Macas, Gualaquiza, Morona Santiago, Ecuador.
O: 31AUG2021 07:53:52 12.5N 87.8W ML=4.0 EMSC NEAR COAST OF NICARAGUA
P: 28AUG2021 136487 13.0N 87.0W 3.5-5.2 BAAAA Nicaragua
O: 31AUG2021 11:44:28 13.6S 75.9W mb=4.5 EMSC CENTRAL PERU
P: 29AUG2021 136663 13.0S 77.0W 4.0-5.6 AAAAA Central Peru
O: 01SEP2021 01:58:59 15.7N 95.0W ML=4.1 EMSC OFFSHORE OAXACA, MEXICO
O: 01SEP2021 06:27:46 16.1N 94.8W ML=4.1 EMSC OFFSHORE OAXACA, MEXICO
O: 31AUG2021 09:08:36 15.5N 94.1W ML=4.4 EMSC OFFSHORE CHIAPAS, MEXICO
P: 30AUG2021 136473 16.0N 95.0W 3.5-5.1 AAAAA Chiapas, Mexico
O: 31AUG2021 19:09:08 17.6S 69.7W mb=4.3 EMSC TARAPACA, CHILE
P: 31AUG2021 136670 17.0S 69.0W 4.0-5.5 AAAAA So. Peru/Bolivia
O: 31AUG2021 09:29:32 17.0N 100.5W ML=4.0 EMSC OFFSHORE GUERRERO, MEXICO
O: 31AUG2021 12:37:57 17.0N 100.5W ML=4.2 EMSC OFFSHORE GUERRERO, MEXICO
O: 31AUG2021 21:46:38 17.9N 101.0W ML=4.0 EMSC GUERRERO, MEXICO
P: 2SEP2021 136759 18.0N 101.0W 3.5-5.1 AAAAA Michoacan, Mexico
P: 28AUG2021 136484 18.0N 102.0W 3.5-5.4 BAAAA Michoacan, Mexico
O: 31AUG2021 10:28:19 18.0N 66.8W ML=3.4 EMSC PUERTO RICO
O: 31AUG2021 08:27:45 18.0N 66.8W ML=3.3 EMSC PUERTO RICO
P: 26AUG2021 136492 18.0N 67.0W 3.4-5.5 BAAAA Puerto Rico
NEIC reported this earthquake of M 3.5 in Southwestern Puerto Rico was felt with intensity II-III in the area(s) of Southwestern Puerto Rico with V at Ensenada anv IV in Guayanilla and II-III in Penuelas, Ponce, Puerto Rico.
O: 1SEP2021 00:54:54 18.4N 73.7W ML=3.5 EMSC HAITI REGION
P: 26AUG2021 136494 18.0N 74.0W 3.4-5.4 BAAAA Haiti
O: 31AUG2021 07:52:42 28.1S 70.8W mb=4.4 EMSC ATACAMA, CHILE
P: 26AUG2021 136679 28.0S 71.0W 4.0-5.4 BAAAA Coast Central Chile
O: 31AUG2021 13:11:28 29.7S 71.6W mb=4.3 EMSC OFFSHORE COQUIMBO, CHILE
P: 26AUG2021 136695 30.0S 71.0W 4.0-5.6 BAAAA Coast Central Chile
AFRICA AND EUROPE
O: 31AUG2021 11:04:26 39.0N 30.2E Mw=5.1 EMSC WESTERN TURKEY
P: 26AUG2021 136580 39.0N 28.0E 3.5-5.1 BABAA Turkey
P: 31AUG2021 136606 41.0N 31.0E 3.5-5.2 ABAAA No. Turkey/Black Sea
SOUTHWEST PACIFIC
O: 31AUG2021 13:26:58 13.7S 167.5E Mw=5.4 EMSC VANUATU
P: 2SEP2021 136933 13.0S 167.0E 4.0-5.4 AAAAA Vanuatu Islands
P: 28AUG2021 136676 14.0S 168.0E 4.0-5.4 BAAAA Vanuatu Islands
O: 31AUG2021 10:04:53 18.2S 178.2W Mw=5.2 EMSC FIJI REGION
P: 26AUG2021 136674 19.0S 176.0W 4.0-5.7 BABAA Tonga Islands
O: 31AUG2021 21:22:19 23.8S 179.2W mb=4.2 EMSC SOUTH OF FIJI ISLANDS
P: 30AUG2021 136690 22.0S 180.0W 4.0-5.6 ABAAA Tonga Islands
O: 31AUG2021 22:59:16 19.5S 169.7E mb=4.4 EMSC VANUATU
P: 4SEP2021 136934 19.0S 168.0E 4.0-5.7 BABAA Vanuatu Islands
P: 29AUG2021 136676 18.0S 168.0E 4.0-5.6 ABBAA Vanuatu Islands
O: 1SEP2021 06:33:45 22.3S 171.7E Mw=5.1 EMSC SOUTHEAST OF LOYALTY ISLANDS
P: 2SEP2021 136937 22.0S 169.0E 4.0-5.5 AABAA Loyalty Islands
P: 28AUG2021 136681 23.0S 171.0E 4.0-5.7 BAAAA Loyalty Islands
OCEAN RIDGES
O: 31AUG2021 22:54:49 29.8N 42.7W mb=4.8 EMSC NORTHERN MID-ATLANTIC RIDGE
O: 31AUG2021 22:02:47 29.9N 42.8W mb=4.7 EMSC NORTHERN MID-ATLANTIC RIDGE
O: 31AUG2021 22:24:23 29.8N 42.7W mb=5.0 EMSC NORTHERN MID-ATLANTIC RIDGE
P: 4SEP2021 136783 29.0N 43.0W 4.0-5.5 BAAAA Mid-Atlantic Ridge
P: 26AUG2021 136506 29.0N 44.0W 4.0-5.5 BAAAA Mid-Atlantic Ridge
O: 31AUG2021 14:24:27 57.0S 25.2W Mw=5.6 EMSC SOUTH SANDWICH ISLANDS REGION
P: 25AUG2021 136710 59.0S 26.0W 4.0-5.7 CBAAA So. Sandwich Islands
O: 31AUG2021 18:27:01 60.2S 24.1W mb=4.8 EMSC SOUTH SANDWICH ISLANDS REGION
P: 3SEP2021 136965 61.0S 22.0W 4.0-5.6 BABAA Southern Ocean
O: 31AUG2021 22:40:28 61.2S 39.0W mb=5.2 EMSC SCOTIA SEA
P: 28AUG2021 136712 61.0S 34.0W 4.0-5.5 BABAA Southern Ocean
ZEALANDIA AND AUSTRALIA REGION
No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia
today. GeoNet did not report any felt events in the area.
JAPAN AND KURIL ISLANDS
O: 31AUG2021 17:55:12 33.9N 135.3E mb=4.0 EMSC NEAR S. COAST OF WESTERN HONSH
P: 29AUG2021 136532 33.0N 137.0E 3.5-5.0 AABAA Central/So. Honshu Japan
NEIC reported this earthquake of M 4.0 in Southwestern Honshu, Japan was felt with intensity II-III in the area(s) of Southwestern Honshu, Japan at Kobe.
U.S./CANADA*
WESTERN U.S./CANADA
CALIFORNIA
O: 1SEP2021 02:15:09 32.1N 117.1W Ml=2.3 EMSC OFFSHORE BAJA CALIFORNIA, MEXI
P: 29AUG2021 136560 32.1N 116.4W 2.5-4.9 AAAAA So. California
O: 31AUG2021 15:20:55 32.4N 115.2W Ml=2.3 EMSC BAJA CALIFORNIA, MEXICO
P: 29AUG2021 136560 32.1N 116.4W 2.5-4.9 AAAAA So. California
O: 31AUG2021 09:50:07 35.5N 118.4W Ml=3.1 EMSC CENTRAL CALIFORNIA
P: 30AUG2021 136568 35.3N 118.6W 2.5-4.5 AAAAA So. California
NEIC reported this earthquake of M 3.1 in Central California was felt with intensity II-III in the area(s) of Central California at Bodfish, Lake Isabella, Weldon, Wofford Heights, Tehachapi, Inyokern, California.
O: 31AUG2021 22:26:40 35.9N 117.7W Ml=2.4 EMSC CENTRAL CALIFORNIA
O: 1SEP2021 00:00:40 35.9N 117.7W Ml=2.2 EMSC CENTRAL CALIFORNIA
P: 28AUG2021 136570 35.9N 117.7W 2.5-4.6 BAAAA So. California
O: 31AUG2021 15:04:51 36.0N 116.2W ml=2.0 EMSC CENTRAL CALIFORNIA
P: 28AUG2021 136569 35.5N 116.4W 2.5-4.7 BAAAA So. California
O: 31AUG2021 16:09:55 36.6N 121.1W Mw=4.1 EMSC CENTRAL CALIFORNIA
P: 3SEP2021 136803 36.4N 121.0W 2.5-4.6 BAAAA Central California
P: 26AUG2021 136526 36.7N 121.4W 2.5-4.6 BAAAA Central California
O: 31AUG2021 18:27:32 37.5N 121.8W Md=2.3 EMSC SAN FRANCISCO BAY AREA, CALIF.
P: 5SEP2021 136805 37.4N 121.8W 2.5-4.4 BAAAA Central California
P: 30AUG2021 136527 36.9N 121.7W 2.5-4.7 AAAAA Central California
O: 31AUG2021 19:55:31 38.2N 117.9W ml=2.0 EMSC NEVADA
P: 28AUG2021 136522 38.4N 118.7W 2.5-4.7 BAAAA California/Nevada area
P: 29AUG2021 136520 37.4N 118.6W 2.5-4.7 AAAAA California/Nevada area
O: 31AUG2021 22:08:35 38.3N 122.7W Md=2.2 EMSC NORTHERN CALIFORNIA
P: 2SEP2021 136806 38.7N 122.7W 2.5-4.5 AAAAA Central California
P: 28AUG2021 136529 38.9N 122.8W 2.5-4.6 BAAAA Central California
NEIC reported this earthquake of M 3.4 north of San Francisco, California was felt with intensity II-III in the area(s) north of San Francisco, California at Ukiah, Lakeport, Upper Lake, Redwood Valley, Hoopland, Nice, Willits.
O: 31AUG2021 08:17:59 38.6N 119.4W ml=2.5 EMSC CENTRAL CALIFORNIA
O: 31AUG2021 19:07:43 38.6N 119.4W ml=2.7 EMSC CENTRAL CALIFORNIA
O: 1SEP2021 05:10:59 38.5N 119.4W Md=2.0 EMSC CENTRAL CALIFORNIA
P: 30AUG2021 136523 38.5N 119.6W 2.5-4.6 AAAAA California/Nevada area
NEIC reported this earthquake of M 2.8 in Western Nevada was felt with intensity II-III in the area(s) of Western Nevada at Coleville.
O: 31AUG2021 08:01:11 40.3N 124.4W ML=3.4 EMSC OFFSHORE NORTHERN CALIFORNIA
O: 31AUG2021 08:01:11 40.3N 124.4W ML=4.0 ANSS OFFSHORE NORTHERN CALIFORNIA
P: 31AUG2021 136608 40.2N 124.2W 2.5-4.4 AAAAA Off Coast of No. Calif
O: 31AUG2021 17:21:10 41.0N 114.9W Mw=4.7 EMSC NEVADA
P: 2SEP2021 136854 40.2N 114.6W 2.5-4.7 AAAAA California/Nevada area
P: 30AUG2021 136582 39.6N 111.9W 2.0-4.4 ABBAA Utah area
ALASKA
O: 31AUG2021 22:15:47 54.6N 156.8W mb=3.8 EMSC SOUTH OF ALASKA
O: 31AUG2021 10:05:15 55.6N 156.1W ml=3.1 EMSC SOUTH OF ALASKA
P: 29AUG2021 136625 54.7N 156.9W 3.5-5.3 AAAAA Alaska Peninsula
O: 31AUG2021 07:03:48 63.6N 149.8W ML=3.4 EMSC CENTRAL ALASKA
P: 30AUG2021 136651 63.0N 148.6W 3.2-5.3 AAAAA Central Alaska
O: 31AUG2021 16:42:51 69.2N 144.5W ML=3.3 EMSC NORTHERN ALASKA
P: 28AUG2021 136655 69.0N 144.0W 3.0-4.8 BAAAA Northern Alaska
PACIFIC NORTHWESTERN U.S./WESTERN CANADA
O: 31AUG2021 19:06:54 46.0N 122.9W Md=2.0 EMSC OREGON
P: 5SEP2021 136886 46.9N 122.0W 2.0-4.2 BAAAA Washington state, U.S.
ROCKY MOUNTAINS REGION
O: 31AUG2021 07:50:11 31.6N 104.1W ML=2.5 EMSC WESTERN TEXAS
O: 31AUG2021 13:33:23 31.7N 104.4W ML=3.6 EMSC WESTERN TEXAS
O: 01SEP2021 02:38:24 31.8N 103.8W ML=2.7 EMSC WESTERN TEXAS
O: 31AUG2021 11:57:14 31.5N 103.4W ML=2.4 EMSC WESTERN TEXAS
O: 31AUG2021 10:17:19 32.2N 103.1W ML=2.1 EMSC NEW MEXICO
P: 25AUG2021 136557 31.6N 103.6W 2.0-4.0 CAAAA SW U.S.A
NEIC reported this earthquake of M 3.6 in Western Texas was felt with intensity II-III in the area(s) of Western Texas in Salt Flat.
O: 31AUG2021 19:57:31 39.4N 110.3W ML=2.1 EMSC UTAH
P: 30AUG2021 136582 39.7N 110.8W 2.0-4.4 AAAAA Utah area
O: 31AUG2021 11:39:46 42.4N 110.2W Ml=2.3 EMSC WYOMING
P: 29AUG2021 136590 41.8N 108.7W 2.0-4.3 AABAA Colorado area
O: 31AUG2021 14:15:13 44.5N 115.2W ML=2.4 EMSC SOUTHERN IDAHO
O: 31AUG2021 14:17:00 44.5N 115.3W ML=2.7 EMSC SOUTHERN IDAHO
O: 31AUG2021 14:28:31 44.5N 115.2W ML=2.5 EMSC SOUTHERN IDAHO
O: 31AUG2021 18:33:13 44.4N 115.2W Ml=2.4 EMSC SOUTHERN IDAHO
P: 2SEP2021 136862 44.4N 115.1W 2.0-4.0 AAAAA Montana/Idaho
P: 26AUG2021 136599 44.4N 115.1W 2.0-4.1 BAAAA Montana/Idaho
O: 1SEP2021 00:06:03 45.1N 111.9W Ml=2.1 EMSC WESTERN MONTANA
P: 29AUG2021 136624 45.6N 111.9W 2.0-3.9 AAAAA Yellowstone/Wyoming
EASTERN U.S./CANADA
O: 31AUG2021 12:28:40 28.9N 98.3W ML=2.0 EMSC SOUTHERN TEXAS
O: 31AUG2021 10:57:44 28.9N 98.3W ML=2.5 EMSC SOUTHERN TEXAS
P: 1SEP2021 136785 29.0N 99.0W 3.0-4.9 AAAAA Northern Mexico
P: 24AUG2021 136509 28.0N 98.0W 3.0-4.6 CAAAA Northern Mexico
O: 31AUG2021 10:36:28 47.4N 77.6W MB=2.1 ECAN Val-d'Or, QC
P: 5SEP2021 136868 47.0N 76.0W 2.0-4.3 BAAAA New York State
O: 29AUG2021 08:24:23 47.5N 61.9W MB=2.1 ECAN Cap-aux-Meules, QC
P: 29AUG2021 136591 49.0N 66.0W 2.0-3.9 ABCAA E. of Maine
HAWAII
No earthquakes of M>=3 were located in Hawaii.
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