Previous two summaries

MAJOR AFTERSHOCK HITS ALASKA PENINSULA AREA

EARTHQUAKE SUMMARY FOR OCTOBER 19, 2020

A major aftershock of M 7.5 in the area south of Alaska and west of the Alaska Peninsula near Unimak Island occurred today. It was reported strongly felt with damage intensity VIII at Sand Point, Perryville, Cold Bay and King Cove; V in Chignik Lagoon, Chignik, and IV in False Pass and Pilot Point and Akutan, Alaska. The tsunami from the M 7.5 was recorded by PTWC in Hilo Hawaii and Hanalei, Hawaii with height of 11 inches (28 cm); Sand Point, and Chignik Bay Alaska (2.5 feet); PTWC reported two tsunami waves of about 1.3 meters (4 feet 3 inches) were also generated. A tsunami warning was issued but later downgraded by PTWC. Local communities issued evacuations to higher elevations. Many boats headed out to sea, the safest place during moderate tsunamis. Many were prepared for a strong aftershock of the M 7.8 in the area of July 22. This summary had expected a strong earthquake in the western U.S. at this time with the new moon as:

"Based on the history of large earthquakes around the world over the past four months, it is likely that a strong enhancement of seismicity will coincide with the upcoming new moon. This summary has noted this as:

"The new moon will arrive on October 16, 2020 at 19:31 UT. Longitudes which are near 115 West and 65 East are at sub-solar and antisolar conditions and will experience the strongest tidal stresses at this time. In the west these include areas of California and western U.S. and Canada and the Gulf of California as well as areas of the southeast Pacific Rise including areas near Easter Island. In the east these include areas of Afghanistan, Iran, India and Pakistan and portions of the Southwest Indian Ocean. These areas are most likely to see tidally triggered strong seismic enhancement in the next week. Many areas are subject to tidal enhancement of seismicity and the coming week should see several strong to major earthquakes in the world. In the past four months six of the seven quakes of M>=6.7 have occurred within several days of the New moon. These included events in the mid-Atlantic; Banda Sea; Sumatra; Alaska Peninsula; Oaxaca, Mexico and the Kermadec Islands. Three of these occurred on the 21st-23rd of the month the other three occurred on the 18th of the month." (October 12-13, 2020)

The earthquakes in question follow:

MO DA HR MN SE YEAR LAT LONG DEP MAG Location

09 18 21 43 58 2020 0.8 -26.7 30 6.7 Central Mid-Atlantic Ridge

09 01 04 09 30 2020 -28.0 -71.0 30 6.8 Atacama, Chile

08 21 04 09 52 2020 -6.7 123.5 643 6.9 Banda Sea

08 18 22 29 22 2020 -4.2 101.2 10 6.8 Sumatra

07 22 06 12 44 2020 55.1 -158.6 30 7.8 Alaska Peninsula

06 23 15 29 04 2020 16.1 -95.9 10 7.4 Oaxaca, Mexico

06 18 12 49 00 2020 -33.4 -177.5 100 7.4 Kermadec Islands

" (October 13, 2020)

and

"Regional seismicity in Central and southern California and western North America peaks around October 18-20 and exactly half a year earlier around April 18-20 and often includes a strong earthquake towards the end of October. This appears to be related to strong hurricanes and nor'easters at this time of year making landfall on the eastern seaboard of the U.S. Another contributing factor is very strong geomagnetic storms or solar flares such as occurred with the Loma Prieta earthquake in October 1989. There is no evidence that a strong oceanic storm making landfall nor of a major geomagnetic or solar event at this time, so at this time only a moderate enhancement in regional seismicity in the western U.S or Canada is expected, but this could change as time proceeds." (October 10, 2020)

Since that time a series of B- and C-class solar flares occurred beginning on October 15 and culminating in the largest solar flare since May 29, 2020. This summary noted this in the previous issue as:

"It may also have been affected by a C 3.5 solar flare which occurred earlier in the day and was the strongest such observed flare since late May, 2020." (October 18, 2020)

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

#-------------------------------------------------------------------------------

6960 1457 1511 1516 C3.5 (October 16, 2020) 1.3E-03

The last flare of larger size was:

450 1041 1046 1050 C9.3 (May 29, 2020) 1.4E-03

A new geomagnetic storm reached active disturbance today at high latitudes. This was most active in the several hours before the M 7.5 in Alaska. This summary noted today's activity at high latitudes in the geomagnetic field as:

"The geomagnetic field saw quiet conditions today. The AP level was 6. High latitude geomagnetic field saw disturbed conditions with AP 14. This is the strongest disturbance in the high latitude geomagnetic field since October 1-2. It peaked with KP reaching 5 from 1200 - 1800 UT, the strongest KP since October 2. Strong disturbances in the geomagnetic field can help promote seismicity and may do so at high latitudes with this storm." (October 19, 2020)

Continuing far-field triggering of seismicity is considered likely from today's event. This summary has detailed moderate to large earthquakes at likely triggering distances from the M 7.8 on July 22 in previous issues as:

180 degrees (node 2): Alaska Peninsula to South of Africa,

144 degrees (node 5): Alaska Peninsula to South Shetland Islands, South Georgia Islands, Mozambique, South Africa,

120 degrees (node 3): Alaska Peninsula to Los Lagos, Chile,

101-104 degrees (node 7): Alaska Peninsula to Socotra, South of Sumatra, Owen Fracture Zone, Central Mid-Atlantic, Honduras, Sumatra, South Pacific, West Chile Rise, northern Chile, southern Peru, Java, Sumatra, South Island, New Zealand, New Guinea to Gulf of California, South of Africa, Utah, Wyoming, Idaho, Southern California,

90 degrees (node 4): Alaska Peninsula to Northern Peru, Banda Sea, Iran, Crete, Lebanon, Pakistan, Kermadec Islands, Canary Islands,

72 degrees (node 5): Alaska Peninsula to Dominican Republic, Galapagos, Mindanao, Philippines, Fiji, England, Samoa, Philippines, New Guinea to Fox Islands, Xizang, China,

60 degrees (node 6): Alaska Peninsula to Vera Cruz, Oaxaca, Mexico

52 degrees (node 7): Alaska Peninsula to Pennsylvania, Greenland Sea, Quebec, North Carolina, New York, Izu Islands, Japan,

Further seismic enhancement is likely in these regions in coming days.

The only other earthquake within about 250 km of today's epicenter with M>=7.5 in the past 30 years was the M 7.8 on July 22, 2020. Today's epicenter is about 100 km southwest of the July mainshock. Today’s activity in the Alaska Peninsula had been expected in forecast 128007 most likely to occur around October 17. Following is a listing of events of M>=5.0 in the area today. A more complete listing can be found in the regional "ALASKA" section below.

O: 19OCT2020 21:22:27 54.3N 159.6W mb=5.2 EMSC SOUTH OF ALASKA

O: 19OCT2020 21:32:19 54.3N 159.8W Mw=5.5 EMSC SOUTH OF ALASKA

O: 19OCT2020 21:45:27 54.3N 159.9W Mw=5.9 EMSC SOUTH OF ALASKA

O: 19OCT2020 21:05:57 54.4N 159.6W mb=5.8 EMSC SOUTH OF ALASKA

O: 20OCT2020 04:07:06 54.4N 159.7W Mw=5.6 EMSC SOUTH OF ALASKA

O: 19OCT2020 20:54:40 54.7N 159.8W Mw=7.5 EMSC SOUTH OF ALASKA

P: 17OCT2020 128007 54.8N 158.7W 3.5-4.8 AAAAA Alaska Peninsula

An earthquake in Queen Charlotte Island, Canada of M 4.6 was reported by Earthquakes Canada four minutes after the Alaska Peninsula M 7.5. It may be a ghost event created by misreading of an automatic earthquake algorithm or a real event triggered by energy from Alaska.

O: 19OCT2020 20:58:07 52.0N 133.3W MB=4.6 ECAN OF VILLAGE OF QUEEN CHARLOTTE,

P: 14OCT2020 128010 52.0N 132.0W 3.0-4.9 BAAAA British Colombia

Similarly an M 3.8 in Iceland ten minutes after the Alaska Peninsula event recorded by EMSC may or may not have occurred. Forecast 128029 had expected activity in this area in mid-October.

O: 19OCT2020 21:04:11 66.4N 17.3W ML=3.8 EMSC ICELAND REGION

P: 15OCT2020 128029 66.0N 16.0W 3.0-4.4 BAAAA Iceland area

An M 4.9 near the antipode of the Alaskan Peninsula occurred eight hours earlier in the area South of Africa. This area became active in early and mid-August with an M 4.7 on August 3 and an M 4.9 on August 17. When the earthquake on August 17 occurred this summary noted in this regard:

"An earthquake of M 4.9 occurred today south of Africa within several km of the exact antipode of the M 7.8 in the Alaska Peninsula of July 22, 2020. This continues a series of events in this region which have occurred with moderate to large magnitude since the Alaska Peninsula quake. The area was expected to see enhanced activity at this time due to antipodal energy focusing from Alaska. Today's event is the nearest of these event to the exact antipode (compare 54N 158W and 53S 26E)." (August 17, 2020)

Forecast 128088 had expected today's activity south of Africa was likely in mid-October.

O: 19OCT2020 12:20:55 52.9S 25.7E mb=4.9 EMSC SOUTH OF AFRICA

P: 16OCT2020 128088 51.0S 29.0E 4.0-5.6 BBBAA Atlantic-Indian Ridge

A moderate earthquake of M 4.6-5.0 was widely felt in the Dominican Republic today. It was reported by NEIC with maximum intensity IV in the Dominican Republic at Las Terrenas, Samana, Monte Plata, El Carril, and II-III in San Pedro, Santo Domingo, Otra Banda, El Llano and in Puerto Rico at San Sebastian.

No tsunami was reported with this earthquake. The last earthquake within about

100 km of this epicenter in the Dominican Republic with M>=4.6 was an M 4.6 on December 22, 2018. The last of larger magnitude was an M 5.2 on September 23, 2018. Forecast 127894 had expected today's event in this area was likely in mid-October. A series of smaller regional events over the past several weeks led to today's M 4.6. Today's epicenter is near the fifth node (72 degrees) from the Alaska Peninsula.

O: 19OCT2020 09:00:46 19.1N 69.7W mb=4.6 EMSC DOMINICAN REPUBLIC

P: 15OCT2020 127894 19.0N 71.0W 3.4-4.9 BAAAA Puerto Rico

Earthquakes of M 5.8 and 5.9 (BMG magnitudes) hit the area south of Sumatra today. BMG reported they were felt with intensity IV-V in the area near Bengkulu, Mukumuku, Tuapejat, Muara Aman, Tais and others. This continues a series of earthquakes in this area over the past four days as noted in previous issues of this summary as:

"The M 5.3 south of Sumatra continued a swarm in the area which began with an M 5.4 on October 15, 2020. It is the second largest event in this swarm to date. It occurred near local solar midnight and may have affected by high tidal stresses with the new moon. Forecast 127869 had expected activity in this area south of Sumatra was likely around October 21." (October 17-19, 2020)

Forecast 127869 had expected this area would be active around October 21. The M 5.9 occurred within about half an hour of local solar noon, a time at which tidal stresses area maximized and was probably promoted by these stresses. An M 6.9 hit about 200 km southeast of today's epicenter on August 18, 2020 with the new moon but the last earthquake within this radius of larger magnitude was an M 6.1 on February 2, 2019.

These epicenters are located at 99 degrees from the Alaska Peninsula and energy transfer between the two areas may have helped trigger some of this activity in Alaska and Sumatra.

O: 19OCT2020 07:31:30 3.3S 100.4E Mw=5.9 EMSC KEP. MENTAWAI REGION, INDONESI

O: 19OCT2020 07:47:21 3.3S 100.4E Mw=5.5 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 19OCT2020 09:42:55 3.3S 100.4E mb=5.1 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 19OCT2020 08:14:04 3.4S 100.4E mb=4.8 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 20OCT2020 01:52:07 3.5S 100.3E ML=4.2 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 20OCT2020 00:41:38 4.0S 99.9E mb=4.5 EMSC SOUTHWEST OF SUMATRA, INDONESIA

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 AAAAA So. of Sumatera

Seismicity in California was also active today. The strongest activity in this area was in the Redwood Valley area of northern California where events of M 3.5 and 4.0 were recorded by NEIC. NEIC reported these earthquakes of M 4.0 and 3.5 in Northern California was felt with intensity II-III in the area(s) of Redwood Valley, Potter Valley, Willits, Ukiah, Comptche, Fort Bragg, Mendocino, Albion and Lakeport. NEIC reported this earthquake of M 2.9 in northern California was felt with intensity II-III in the area(s) of northern California in Redwood Valley, Potter Valley, Willits, Mendocino, Nice. The last earthquake of M>=4 in the area was an M 4.2 on August 19, 2020 and today's activity appears to be aftershocks of that event. Forecast 127925 had expected today's event within about 10 km was likely in mid-October.

O: 20OCT2020 03:02:52 39.4N 123.3W Md=2.0 EMSC NORTHERN CALIFORNIA

O: 20OCT2020 04:01:06 39.4N 123.2W Md=2.9 EMSC NORTHERN CALIFORNIA

O: 20OCT2020 01:59:46 39.4N 123.3W ML=3.1 EMSC NORTHERN CALIFORNIA

O: 20OCT2020 01:59:46 39.4N 123.3W ML=3.5 ANSS NORTHERN CALIFORNIA

O: 20OCT2020 01:58:50 39.4N 123.3W ML=4.0 ANSS NORTHERN CALIFORNIA

P: 14OCT2020 127925 39.4N 123.3W 2.5-4.3 CAAAA Central California

P: 17OCT2020 127925 39.7N 123.7W 2.5-4.3 BAAAA Central California

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: 19OCT2020 22:03:58 24.5N 122.3E ML=4.3 TAI Hualien, Taiwan

P: 15OCT2020 127913 23.0N 122.0E 4.0-5.3 BBAAA Taiwan

CWB reported this earthquake was felt with intensity II in Yilan and I in Taipei and Hualien Counties, Taiwan.

O: 19OCT2020 10:17:40 39.6N 72.8E mb=4.7 EMSC KYRGYZSTAN

P: 22OCT2020 127974 40.0N 75.0E 4.0-5.3 BABAA Kirgizstan/Xinjiang

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

INDONESIA AND PHILIPPINES

O: 19OCT2020 08:22:06 0.1S 125.8E mb=4.7 EMSC MOLUCCA SEA

P: 20OCT2020 127855 1.0S 127.0E 4.0-5.3 AABAA Ceram area

O: 20OCT2020 01:00:19 0.7N 121.0E ML=4.0 EMSC MINAHASA, SULAWESI, INDONESIA

P: 15OCT2020 127838 0.0N 120.0E 4.0-5.3 BAAAA Celebes Sea

O: 19OCT2020 18:41:42 1.3S 99.4E ML=4.3 EMSC KEP. MENTAWAI REGION, INDONESI

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 AAAAA So. of Sumatera

O: 20OCT2020 03:12:49 1.7N 127.4E mb=4.6 EMSC HALMAHERA, INDONESIA

P: 20OCT2020 127855 1.0S 127.0E 4.0-5.3 ACAAA Ceram area

O: 19OCT2020 09:38:48 2.9N 96.3E Mw=5.1 EMSC SIMEULUE, INDONESIA

P: 16OCT2020 127850 3.0N 99.0E 4.0-5.3 BACAA So. Sumatera

O: 19OCT2020 07:31:30 3.3S 100.4E Mw=5.9 EMSC KEP. MENTAWAI REGION, INDONESI

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 AAAAA So. of Sumatera

O: 19OCT2020 14:11:57 7.1S 126.6E Mw=5.2 EMSC KEPULAUAN BARAT DAYA, INDONESI

P: 16OCT2020 127853 7.0S 125.0E 4.0-5.3 BABAA Banda Sea

NEIC reported this earthquake of M 5.2 in the Banda Sea, Indonesia was felt with intensity II-III in the area(s) of Dili Dili, East Timor, Indonesia.

O: 19OCT2020 20:59:06 7.9N 126.6E ML=4.2 EMSC MINDANAO, PHILIPPINES

P: 21OCT2020 127842 7.0N 126.0E 4.0-5.3 AAAAA Central Philippines

O: 19OCT2020 19:57:14 8.3S 108.1E ML=4.7 EMSC JAVA, INDONESIA

O: 19OCT2020 16:09:30 9.9S 108.7E mb=4.9 EMSC SOUTH OF JAVA, INDONESIA

P: 17OCT2020 127868 9.0S 111.0E 4.0-5.3 AACAA So. of Java

O: 19OCT2020 21:03:34 10.6N 126.3E ML=4.4 EMSC PHILIPPINE ISLANDS REGION

P: 22OCT2020 127846 8.0N 127.0E 4.0-5.3 BCAAA Halmahera

O: 19OCT2020 19:32:55 11.6N 124.3E ML=4.5 EMSC LEYTE, PHILIPPINES

P: 21OCT2020 127884 12.0N 122.0E 3.5-4.8 AABAA Luzon, Philippines

O: 19OCT2020 07:47:21 3.3S 100.4E Mw=5.9 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 19OCT2020 07:47:21 3.3S 100.4E Mw=5.5 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 19OCT2020 09:42:55 3.3S 100.4E mb=5.1 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 19OCT2020 08:14:04 3.4S 100.4E mb=4.8 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 20OCT2020 01:52:07 3.5S 100.3E ML=4.2 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 20OCT2020 00:41:38 4.0S 99.9E mb=4.5 EMSC SOUTHWEST OF SUMATRA, INDONESIA

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 AAAAA So. of Sumatera

CENTRAL AND SOUTH AMERICA

O: 19OCT2020 17:13:40 1.1S 79.9W ML=4.0 EMSC ECUADOR

P: 16OCT2020 127856 1.0S 81.0W 4.0-5.3 BAAAA Ecuador

P: 21OCT2020 127856 1.0S 78.0W 4.0-5.3 AABAA Ecuador

O: 19OCT2020 13:18:52 10.8S 74.6W mb=4.6 EMSC CENTRAL PERU

O: 19OCT2020 21:50:40 10.9S 75.5W ML=4.2 EMSC CENTRAL PERU

P: 21OCT2020 127864 9.0S 80.0W 4.0-5.3 ABCAA No. Peru

O: 19OCT2020 16:36:26 14.7N 93.7W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO

O: 19OCT2020 08:35:32 15.0N 93.0W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO

P: 19OCT2020 127877 14.0N 93.0W 3.5-5.1 AAAAA Chiapas, Mexico

O: 19OCT2020 08:53:14 15.1N 94.6W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO

O: 19OCT2020 15:36:08 15.3N 94.0W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO

P: 19OCT2020 127877 14.0N 93.0W 3.5-5.1 ABAAA Chiapas, Mexico

O: 19OCT2020 20:53:37 17.1N 94.4W ML=4.1 EMSC OAXACA, MEXICO

P: 21OCT2020 127877 17.0N 94.0W 3.5-5.0 AAAAA Chiapas, Mexico

O: 19OCT2020 15:37:07 17.9N 66.8W ML=3.3 EMSC PUERTO RICO REGION

P: 21OCT2020 127893 18.0N 67.0W 3.4-4.8 AAAAA Puerto Rico

O: 19OCT2020 09:00:46 19.1N 69.7W mb=4.6 EMSC DOMINICAN REPUBLIC

P: 15OCT2020 127894 19.0N 71.0W 3.4-4.9 BAAAA Puerto Rico

O: 19OCT2020 08:38:59 23.7N 104.1W ML=4.2 EMSC DURANGO, MEXICO

P: 18OCT2020 127903 24.0N 109.0W 3.5-4.8 AACAA Gulf of California

O: 19OCT2020 16:38:44 27.3N 111.4W ML=3.7 EMSC GULF OF CALIFORNIA

P: 14OCT2020 127903 28.0N 110.0W 3.5-4.8 BABAA Gulf of California

O: 20OCT2020 01:09:18 30.7S 71.4W mb=4.2 EMSC COQUIMBO, CHILE

O: 19OCT2020 21:59:05 31.7S 70.6W mb=4.1 EMSC COQUIMBO, CHILE

P: 17OCT2020 128073 31.0S 70.0W 4.0-5.4 AAAAA Central Chile

NEIC reported this earthquake of M 4.2 in Valparaiso, Chile was felt with intensity II-III in the area(s) of Valparaiso, Chile in Vina del Mar and Valparaiso.

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

AFRICA AND EUROPE

O: 20OCT2020 02:36:46 37.0N 20.9E mb=4.3 EMSC CENTRAL MEDITERRANEAN SEA

P: 17OCT2020 127936 37.0N 21.0E 3.0-4.3 BAAAA No. Greece

O: 19OCT2020 21:04:11 66.4N 17.3W ML=3.8 EMSC ICELAND REGION

P: 15OCT2020 128029 66.0N 16.0W 3.0-4.4 BAAAA Iceland area

O: 19OCT2020 09:08:31 71.7N 3.3W mb=4.4 EMSC JAN MAYEN ISLAND REGION

P: 17OCT2020 128041 71.0N 7.0W 3.5-4.8 AAAAA Jan Mayen Isl. area

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

SOUTHWEST PACIFIC

O: 19OCT2020 21:58:00 17.4S 178.5W mb=4.5 EMSC FIJI REGION

P: 16OCT2020 128055 18.0S 178.0W 4.0-5.3 BAAAA Tonga Islands

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

OCEAN RIDGES

O: 19OCT2020 12:20:55 52.9S 25.7E mb=4.9 EMSC SOUTH OF AFRICA

P: 16OCT2020 128088 51.0S 29.0E 4.0-5.6 BBBAA Atlantic-Indian Ridge

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

ZEALANDIA AND AUSTRALIA REGION

O: 19OCT2020 17:31:20 36.9S 177.1E ML=4.1 EMSC OFF E. COAST OF N. ISLAND, N.Z

P: 19OCT2020 128078 37.0S 178.0E 3.0-4.3 AAAAA North Island, N.Z.

JAPAN AND KURIL ISLANDS

O: 19OCT2020 21:59:55 47.1N 152.4E mb=4.6 EMSC KURIL ISLANDS

P: 22OCT2020 128000 49.0N 153.0E 3.5-5.3 BBAAA So. Kurils

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 19OCT2020 17:21:37 34.9N 116.3W Ml=3.1 EMSC SOUTHERN CALIFORNIA

O: 19OCT2020 21:47:47 34.9N 116.3W ML=2.5 EMSC SOUTHERN CALIFORNIA

O: 19OCT2020 09:34:58 34.9N 116.3W Ml=2.0 EMSC SOUTHERN CALIFORNIA

P: 15OCT2020 127951 34.6N 118.4W 2.5-4.3 BABAA So. California

NEIC reported this earthquake of M 3.1 in Southern California was felt with intensity II-III in the area(s) of Southern California in Victorville and Los Angeles.

O: 19OCT2020 21:00:32 35.5N 115.6W ml=3.2 EMSC SOUTHERN CALIFORNIA

P: 17OCT2020 127917 37.4N 117.2W 2.5-4.3 ABBAA California/Nevada area

O: 19OCT2020 09:45:33 36.0N 117.4W ML=2.6 EMSC CENTRAL CALIFORNIA

P: 15OCT2020 127917 36.0N 117.9W 2.5-4.3 BAAAA California/Nevada area

O: 19OCT2020 18:00:23 36.5N 121.1W Md=2.1 EMSC CENTRAL CALIFORNIA

P: 15OCT2020 127921 36.4N 121.0W 2.5-4.3 BAAAA Central California

O: 19OCT2020 17:19:18 36.9N 121.6W Md=2.2 EMSC NORTHERN CALIFORNIA

P: 18OCT2020 127922 36.9N 121.7W 2.5-4.3 AAAAA Central California

O: 19OCT2020 10:14:39 38.6N 122.0W Md=2.6 EMSC NORTHERN CALIFORNIA

O: 19OCT2020 10:00:43 38.6N 122.0W Ml=2.9 EMSC NORTHERN CALIFORNIA

P: 22OCT2020 127924 38.5N 122.7W 2.5-4.3 BAAAA Central California

NEIC reported this earthquake of M 2.9 in northern California west of Sacramento was felt with intensity II-III in the area(s) of northern California west of Sacramento at Winters, Davis, Fairfield and Novato.

O: 19OCT2020 21:24:10 38.7N 117.1W ml=2.3 EMSC NEVADA

P: 17OCT2020 127917 37.4N 117.2W 2.5-4.3 ABAAA California/Nevada area

O: 19OCT2020 20:45:52 38.8N 122.8W Md=2.2 EMSC NORTHERN CALIFORNIA

P: 16OCT2020 127924 38.7N 122.7W 2.5-4.3 BAAAA Central California

O: 20OCT2020 03:02:52 39.4N 123.3W Md=2.0 EMSC NORTHERN CALIFORNIA

O: 20OCT2020 04:01:06 39.4N 123.2W Md=2.9 EMSC NORTHERN CALIFORNIA

O: 20OCT2020 01:59:46 39.4N 123.3W ML=3.1 EMSC NORTHERN CALIFORNIA

O: 20OCT2020 01:59:46 39.4N 123.3W ML=3.5 ANSS NORTHERN CALIFORNIA

O: 20OCT2020 01:58:50 39.4N 123.3W ML=4.0 ANSS NORTHERN CALIFORNIA

P: 14OCT2020 127925 39.4N 123.3W 2.5-4.3 CAAAA Central California

P: 17OCT2020 127925 39.7N 123.7W 2.5-4.3 BAAAA Central California

NEIC reported these earthquakes of M 4.0 and 3.5 in Northern California was felt with intensity II-III in the area(s) of Redwood Valley, Potter Valley, Willits, Ukiah, Comptche, Fort Bragg, Mendocino, Albion and Lakeport.

NEIC reported this earthquake of M 2.9 in northern California was felt with intensity II-III in the area(s) of northern California in Redwood Valley, Potter Valley, Willits, Mendocino, Nice.

O: 20OCT2020 01:37:11 40.3N 121.2W Md=2.0 EMSC NORTHERN CALIFORNIA

P: 17OCT2020 127986 40.0N 120.9W 2.5-4.3 BAAAA Northern 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 Big Sur.

O: 19OCT2020 11:44:08 38.1N 118.0W ml=2.4 EMSC NEVADA

O: 19OCT2020 12:20:54 38.1N 118.2W ml=2.4 EMSC NEVADA

O: 19OCT2020 07:42:01 38.2N 117.8W ml=2.1 EMSC NEVADA

O: 19OCT2020 08:43:41 38.2N 118.0W ml=2.5 EMSC NEVADA

O: 19OCT2020 10:52:54 38.2N 117.9W ml=2.1 EMSC NEVADA

O: 19OCT2020 16:04:24 38.2N 118.0W ml=2.4 EMSC NEVADA

P: 13OCT2020 127918 37.9N 118.2W 2.5-4.4 CAAAA California/Nevada area

ALASKA

O: 19OCT2020 21:59:40 53.3N 161.5W ml=3.6 EMSC SOUTH OF ALASKA

P: 15OCT2020 128022 54.5N 161.8W 3.5-4.8 BBAAA Unimak Islands, Aleutians

O: 20OCT2020 02:57:50 54.7N 159.9W mb=4.1 EMSC SOUTH OF ALASKA

P: 17OCT2020 128007 54.8N 158.7W 3.5-4.8 BAAAA Alaska Peninsula

O: 19OCT2020 21:30:15 55.6N 154.7W ML=4.1 EMSC SOUTH OF ALASKA

P: 18OCT2020 128007 54.7N 156.9W 3.5-4.8 AABAA Alaska Peninsula

O: 20OCT2020 04:09:20 59.6N 139.0W ML=3.7 EMSC SOUTHEASTERN ALASKA

P: 17OCT2020 128021 59.0N 139.0W 3.0-4.4 BAAAA Southeast Alaska

O: 19OCT2020 19:42:00 68.9N 147.8W ml=3.0 EMSC NORTHERN ALASKA

P: 16OCT2020 128033 69.0N 144.0W 3.0-4.5 BAAAA Northern Alaska

O: 20OCT2020 01:33:31 54.0N 159.7W ml=3.9 EMSC SOUTH OF ALASKA

O: 19OCT2020 22:00:57 54.2N 159.9W mb=4.3 EMSC SOUTH OF ALASKA

O: 20OCT2020 02:52:24 54.2N 159.6W ml=3.9 EMSC SOUTH OF ALASKA

O: 20OCT2020 05:39:20 54.2N 159.7W mb=4.3 EMSC SOUTH OF ALASKA

O: 19OCT2020 21:22:27 54.3N 159.6W mb=5.2 EMSC SOUTH OF ALASKA

O: 19OCT2020 21:32:19 54.3N 159.8W Mw=5.5 EMSC SOUTH OF ALASKA

O: 19OCT2020 21:45:27 54.3N 159.9W Mw=5.9 EMSC SOUTH OF ALASKA

O: 19OCT2020 22:05:16 54.3N 159.8W mb=4.4 EMSC SOUTH OF ALASKA

O: 19OCT2020 22:17:45 54.3N 160.2W mb=4.3 EMSC ALASKA PENINSULA

O: 19OCT2020 22:28:02 54.3N 159.8W mb=4.5 EMSC SOUTH OF ALASKA

O: 19OCT2020 23:17:08 54.3N 159.9W mb=4.6 EMSC SOUTH OF ALASKA

O: 20OCT2020 00:34:13 54.3N 159.6W mb=4.8 EMSC SOUTH OF ALASKA

O: 20OCT2020 01:21:29 54.3N 159.6W mb=4.7 EMSC SOUTH OF ALASKA

O: 20OCT2020 04:25:19 54.3N 159.8W mb=4.3 EMSC SOUTH OF ALASKA

O: 20OCT2020 06:44:42 54.3N 159.7W mb=4.1 EMSC SOUTH OF ALASKA

O: 19OCT2020 21:05:57 54.4N 159.6W mb=5.8 EMSC SOUTH OF ALASKA

O: 19OCT2020 21:27:05 54.4N 159.6W mb=3.9 EMSC SOUTH OF ALASKA

O: 19OCT2020 21:28:59 54.4N 159.6W mb=4.4 EMSC SOUTH OF ALASKA

O: 19OCT2020 21:43:35 54.4N 159.7W mb=4.5 EMSC SOUTH OF ALASKA

O: 19OCT2020 22:38:14 54.4N 159.6W ml=3.8 EMSC SOUTH OF ALASKA

O: 19OCT2020 23:41:02 54.4N 159.6W mb=4.5 EMSC SOUTH OF ALASKA

O: 20OCT2020 00:31:26 54.4N 159.7W mb=4.1 EMSC SOUTH OF ALASKA

O: 20OCT2020 00:40:11 54.4N 159.7W mb=4.8 EMSC SOUTH OF ALASKA

O: 20OCT2020 00:44:19 54.4N 159.6W mb=4.8 EMSC SOUTH OF ALASKA

O: 20OCT2020 00:56:36 54.4N 159.6W mb=4.8 EMSC SOUTH OF ALASKA

O: 20OCT2020 01:48:04 54.4N 159.6W ML=3.5 EMSC SOUTH OF ALASKA

O: 20OCT2020 04:07:06 54.4N 159.7W Mw=5.6 EMSC SOUTH OF ALASKA

O: 20OCT2020 05:31:14 54.4N 159.8W mb=4.1 EMSC SOUTH OF ALASKA

O: 19OCT2020 22:20:12 54.5N 159.7W mb=4.8 EMSC SOUTH OF ALASKA

O: 19OCT2020 23:42:15 54.5N 159.8W mb=4.9 EMSC SOUTH OF ALASKA

O: 20OCT2020 02:47:46 54.5N 159.8W Mw=4.6 EMSC SOUTH OF ALASKA

O: 19OCT2020 22:11:11 54.6N 159.7W mb=4.4 EMSC SOUTH OF ALASKA

O: 19OCT2020 23:04:24 54.6N 159.6W mb=4.2 EMSC SOUTH OF ALASKA

O: 20OCT2020 00:00:36 54.6N 159.7W mb=4.9 EMSC SOUTH OF ALASKA

O: 20OCT2020 03:09:13 54.6N 159.7W ml=4.2 EMSC SOUTH OF ALASKA

O: 19OCT2020 20:54:40 54.7N 159.8W Mw=7.5 EMSC SOUTH OF ALASKA

O: 20OCT2020 00:23:19 54.7N 159.8W ml=3.7 EMSC SOUTH OF ALASKA

O: 20OCT2020 02:57:50 54.7N 159.9W mb=4.1 EMSC SOUTH OF ALASKA

P: 17OCT2020 128007 54.8N 158.7W 3.5-4.8 AAAAA Alaska Peninsula

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

O: 19OCT2020 20:58:07 52.0N 133.3W MB=4.6 ECAN OF VILLAGE OF QUEEN CHARLOTTE,

P: 14OCT2020 128010 52.0N 132.0W 3.0-4.9 BAAAA British Colombia

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

ROCKY MOUNTAINS REGION

O: 19OCT2020 16:18:27 31.6N 104.3W ML=2.5 EMSC WESTERN TEXAS

P: 16OCT2020 127946 32.6N 104.6W 2.0-3.8 BAAAA SW U.S.A

O: 19OCT2020 19:16:51 44.3N 114.6W Ml=2.4 EMSC SOUTHERN IDAHO

O: 19OCT2020 15:45:26 44.5N 115.2W ML=2.6 EMSC SOUTHERN IDAHO

O: 19OCT2020 13:12:17 44.3N 114.6W ML=2.3 EMSC SOUTHERN IDAHO

P: 20OCT2020 127978 44.4N 114.1W 2.0-3.8 AAAAA Montana/Idaho

O: 19OCT2020 21:01:01 44.5N 111.2W Ml=2.9 EMSC SOUTHERN IDAHO

P: 15OCT2020 128005 43.2N 111.0W 2.0-3.9 BBAAA Yellowstone/Wyoming

EASTERN U.S./CANADA

O: 19OCT2020 15:24:02 36.5N 98.7W ML=2.3 EMSC OKLAHOMA

P: 17OCT2020 127957 37.0N 98.0W 2.0-3.8 AAAAA Southern Plains

HAWAII

O: 19OCT2020 15:25:11 19.3N 155.1W ML=3.1 EMSC ISLAND OF HAWAII, HAWAII

P: 15OCT2020 127882 19.2N 155.2W 3.0-4.3 BAAAA Hawaii

STRONG QUAKE SHAKES SOUTHERN SUMATRA, INDONESIA

EARTHQUAKE SUMMARY FOR OCTOBER 18, 2020

"A series of moderate earthquakes followed the largest earthquake in the world today - an M 5.4 in the Mentawai region south of Sumatra. It was not reported felt in the region. The last earthquake within about 200 km of this epicenter with M>=5.4 was an M 5.4-5.5 on August 15, 2020. These appear to be aftershocks of an M 6.8-6.9 on August 18, 2020. This event occurred on the new moon date of August 18. This summary had noted this at the time as:

"The new moon arrived near the time of today's Sumatra earthquakes. This summary had expected strong triggering from this tidal alignment in Indonesia" (August 18-19, October 15-16, 2020)

O: 19OCT2020 07:47:21 3.3S 100.4E Mw=5.5 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 18OCT2020 22:48:49 3.4S 100.3E mb=5.1 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 19OCT2020 07:31:30 3.3S 100.4E Mw=5.9 EMSC KEP. MENTAWAI REGION, INDONESI

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 ABBAA So. of Sumatera

The strongest earthquake in the U.S. or Canada today was an M 4.3-4.8 in the region near Wrigley, Northwest Territories, Canada. This continues activity in the area which has been discussed in the past several issues of this summary as:

"The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Northwest Territories of Canada. The only earthquake in the past six years within about 300 km of this epicenter with M>=4.4 was an M 4.7 on July 2, 2020. Prior to that earthquakes of M 4.4 and 4.5 occurred in March and July, 2014 in this area. The strongest earthquake in this area in the past 30 years was an M 5.6 on June 10, 1990. Forecast 127772 had expected today's event was likely within about 50 km of this epicenter was likely around October 10." (October 15, 2020)

The last earthquake within about 200 km of this epicenter with M>=4.8 occurred as an M 5.3 on September 26, 2011. Forecast 128034 had expected today's activity was likely around October 22 within about 50 km of today's epicenter.

O: 18OCT2020 16:46:37 62.3N 124.4W mb=4.3 EMSC NORTHWEST TERRITORIES, CANADA

O: 18OCT2020 16:46:38 62.1N 124.7W MB=4.8 ECAN OF WRIGLEY, NT

P: 22OCT2020 128034 62.1N 124.2W 2.5-3.8 AAAAA Northwest Terr., Canada

The region of California and the Gulf of California, Mexico saw elevated seismicity today. The strongest earthquake in the area was an M 4.6 in the Gulf of California. This earthquake was probably triggered by high tidal stresses. It occurred within about half an hour of local solar noon, a prime time for tidal stresses associated with the current new moon as noted in previous issues of this summary:

The event in the Gulf of California is the strongest within about 200 km of

this epicenter in nearly two years - since an M 5.3 on January 31, 2019 and prior to that an M 5.5 on October 8, 2018. Forecast 127903 had expected today's event within about 50 km was likely around October 18. This epicenter is located at 144 degrees from the Sumatra quake of August 18, 2020 and was probably promoted by energy from that source.

O: 19OCT2020 06:25:24 24.4N 109.0W mb=4.6 EMSC GULF OF CALIFORNIA

P: 18OCT2020 127903 24.0N 109.0W 3.5-4.8 AAAAA Gulf of California

Two earthquakes of M 3.5 also occurred today in Southern California. These

were also probably promoted by high tidal stresses. Forecasts 127949 and 127951

had expected this activity was likely around October 16-19.

NEIC reported the earthquake of M 3.5 in Baja California was felt with intensity II-III in the area(s) of Baja California at Puebla, Tecolotes, Mexicali, San Luis and in California at Heber, Holtville, Calexico and El Centro.

O: 18OCT2020 19:04:15 32.4N 115.3W ML=3.0 EMSC BAJA CALIFORNIA, MEXICO

O: 18OCT2020 10:31:33 32.5N 115.1W Mw=3.5 EMSC BAJA CALIFORNIA, MEXICO

O: 18OCT2020 10:41:36 32.5N 115.2W ML=2.0 EMSC BAJA CALIFORNIA, MEXICO

O: 18OCT2020 10:33:47 32.4N 115.2W Ml=3.0 EMSC BAJA CALIFORNIA, MEXICO

P: 16OCT2020 127949 32.4N 115.8W 2.5-4.3 AAAAA So. California

The earthquake east of Los Angeles, California near Lander is the strongest within about 100 km of that epicenter since an M 4.0 on February 7, 2019.

O: 19OCT2020 03:34:43 34.9N 116.3W Mw=3.5 EMSC SOUTHERN CALIFORNIA

P: 19OCT2020 127951 35.6N 118.4W 2.5-4.3 AABAA So. California

NEIC reported this earthquake of M 3.5 in Southern California was felt with intensity II-III in the area(s) of Southern California in Newberry Springs.

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 19OCT2020 07:06:49 37.3N 72.0E mb=4.2 EMSC TAJIKISTAN

P: 22OCT2020 127929 36.0N 72.0E 3.8-5.1 BBAAA Hindu Kush/Pakistan

O: 18OCT2020 17:24:00 34.8N 45.4E ML=4.0 EMSC IRAN-IRAQ BORDER REGION

P: 20OCT2020 127960 38.0N 44.0E 3.5-4.8 ACAAA Turkey

O: 18OCT2020 20:05:17 33.0N 72.5E ML=3.9 EMSC PAKISTAN

P: 21OCT2020 127944 33.0N 74.0E 3.8-5.1 BAAAA Pakistan

O: 18OCT2020 17:24:48 37.4N 45.0E ML=4.0 EMSC TURKEY-IRAN-IRAQ BORDER REGION

P: 20OCT2020 127960 38.0N 44.0E 3.5-4.8 AAAAA Turkey

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

INDONESIA AND PHILIPPINES

O: 18OCT2020 16:39:14 1.0S 134.3E ML=4.3 EMSC NEAR N COAST OF PAPUA, INDONES

P: 14OCT2020 127872 4.0S 134.0E 4.0-5.4 BCAAA West Irian, PNG

O: 19OCT2020 07:31:30 3.3S 100.4E Mw=5.9 EMSC KEP. MENTAWAI REGION, INDONESI

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 ABBAA So. of Sumatera

O: 18OCT2020 10:19:22 4.4S 129.3E mb=4.3 EMSC BANDA SEA

P: 18OCT2020 127873 6.0S 130.0E 4.0-5.3 ABAAA West Irian, PNG

O: 18OCT2020 14:38:42 7.8S 123.5E mb=4.4 EMSC BANDA SEA

P: 21OCT2020 127857 8.0S 123.0E 4.0-5.3 BAAAA Flores Island area

O: 18OCT2020 07:03:46 9.4S 114.0E ML=4.4 EMSC SOUTH OF BALI, INDONESIA

P: 15OCT2020 127868 9.0S 113.0E 4.0-5.3 BAAAA So. of Java

O: 19OCT2020 07:47:21 3.3S 100.4E Mw=5.5 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 18OCT2020 22:48:49 3.4S 100.3E mb=5.1 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 19OCT2020 07:31:30 3.3S 100.4E Mw=5.9 EMSC KEP. MENTAWAI REGION, INDONESI

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 ABBAA So. of Sumatera

CENTRAL AND SOUTH AMERICA

O: 19OCT2020 03:32 37.3S 73.7W mb=4.0 GUC BioBio at Concepcion, Lota and

P: 17OCT2020 128074 39.0S 73.0W 4.0-5.3 ABAAA Central Chile

GUC reported this earthquake was felt with intensity III in BioBio at Concepcion, Lota and II in Chiguayante, Chile.

O: 18OCT2020 16:54 27.4S 70.8W mb=4.3 GUC Atacama at Copiapo and Tierra

P: 17OCT2020 128062 28.0S 71.0W 4.0-5.5 AAAAA Coast Central Chile

GUC reported this earthquake was felt with intensity V in Atacama at Copiapo and Tierra Amarilla; IV in Caldera and III in Chanaral and Diego de Almagro, Chile.

O: 18OCT2020 18:38:55 14.1S 72.8W ML=4.2 EMSC CENTRAL PERU

P: 19OCT2020 128044 14.0S 73.0W 4.0-5.3 AAAAA Central Peru

O: 19OCT2020 03:24:16 16.3N 86.9W mb=4.5 EMSC OFFSHORE HONDURAS

P: 21OCT2020 127888 16.0N 88.0W 3.5-5.2 AAAAA Nicaragua

NEIC reported this earthquake of M 4.5 in Honduras was felt with intensity II-III in the area(s) of Honduras at Sandy Bay, Roatan, La Ceiba, Corozal, Utila, Pena Blanca, Armenta and Tegucigalpa.

O: 18OCT2020 13:20:10 17.9N 67.0W Md=3.0 EMSC PUERTO RICO REGION

P: 21OCT2020 127893 18.0N 67.0W 3.4-4.8 BAAAA Puerto Rico

O: 18OCT2020 15:49:54 18.4N 71.4W ML=3.4 EMSC DOMINICAN REPUBLIC

P: 15OCT2020 127894 19.0N 71.0W 3.4-4.9 ABAAA Puerto Rico

O: 18OCT2020 21:36:16 18.6N 69.6W ML=3.2 EMSC DOMINICAN REPUBLIC

P: 16OCT2020 127900 20.0N 71.0W 3.0-4.4 ABBAA Bahamas/No. Caribbean

O: 19OCT2020 01:22:52 21.9S 66.3W mb=4.0 EMSC POTOSI, BOLIVIA

O: 18OCT2020 11:36:58 22.1S 63.8W mb=4.3 EMSC SALTA, ARGENTINA

P: 17OCT2020 128063 24.0S 69.0W 4.0-5.4 ABCAA Coast No. Chile

O: 19OCT2020 06:25:24 24.4N 109.0W mb=4.6 EMSC GULF OF CALIFORNIA

P: 18OCT2020 127903 24.0N 109.0W 3.5-4.8 AAAAA Gulf of California

O: 18OCT2020 16:54:05 27.3S 70.9W mb=4.8 EMSC ATACAMA, CHILE

P: 17OCT2020 128062 28.0S 71.0W 4.0-5.5 AAAAA Coast Central Chile

NEIC reported this earthquake of M 4.8 in Atacama, Chile was felt with intensity V in the area(s) of Atacama, Chile at Copiapo.

O: 19OCT2020 03:32:32 37.3S 74.1W mb=4.2 EMSC OFFSHORE BIO-BIO, CHILE

P: 17OCT2020 128074 39.0S 73.0W 4.0-5.3 ABAAA Central Chile

NEIC reported this earthquake of M 4.2 in Central Chile was felt with intensity II-III in the area(s) of Central Chile in Arauco, Bio Bio.

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

AFRICA AND EUROPE

O: 18OCT2020 08:07:15 39.1N 23.5E mb=4.4 EMSC AEGEAN SEA

P: 18OCT2020 127915 39.0N 23.0E 3.0-4.4 AAAAA Aegean Sea

NEIC reported this earthquake of M 4.4 in Greece was felt with intensity II-III in the area(s) of Greece at Skiathos, Skopeios, Magnisia and in the Dodecanese Islands.

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

SOUTHWEST PACIFIC

O: 18OCT2020 09:42:30 16.7S 177.3W Mw=5.1 EMSC FIJI REGION

P: 18OCT2020 128055 17.0S 177.0W 4.0-5.4 AAAAA Tonga Islands

O: 18OCT2020 17:18:53 25.0S 178.6E mb=4.2 EMSC SOUTH OF FIJI ISLANDS

P: 19OCT2020 128072 23.0S 179.0E 4.0-5.4 ABAAA Tonga/Fiji

OCEAN RIDGES

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

ZEALANDIA AND AUSTRALIA REGION

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

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

JAPAN AND KURIL ISLANDS

O: 18OCT2020 18:28:30 35.2N 136.6E ML=4.1 EMSC WESTERN HONSHU, JAPAN

P: 17OCT2020 127926 34.0N 136.0E 3.5-4.8 ABAAA Central/So. Honshu Japan

O: 18OCT2020 12:23:32 42.2N 142.8E mb=4.4 EMSC HOKKAIDO, JAPAN REGION

P: 17OCT2020 127970 41.0N 142.0E 3.5-5.3 ABAAA Hokkaido, Japan

O: 19OCT2020 02:38:16 46.5N 153.3E mb=4.4 EMSC KURIL ISLANDS

P: 17OCT2020 128000 45.0N 152.0E 3.5-5.3 ABAAA So. Kurils

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 18OCT2020 19:04:15 32.4N 115.3W ML=3.0 EMSC BAJA CALIFORNIA, MEXICO

O: 18OCT2020 10:31:33 32.5N 115.1W Mw=3.5 EMSC BAJA CALIFORNIA, MEXICO

O: 18OCT2020 10:41:36 32.5N 115.2W ML=2.0 EMSC BAJA CALIFORNIA, MEXICO

O: 18OCT2020 10:33:47 32.4N 115.2W Ml=3.0 EMSC BAJA CALIFORNIA, MEXICO

P: 16OCT2020 127949 32.4N 115.8W 2.5-4.3 AAAAA So. California

O: 18OCT2020 17:16:31 33.2N 116.0W Ml=2.0 EMSC SOUTHERN CALIFORNIA

P: 18OCT2020 127949 32.9N 115.6W 2.5-4.3 AAAAA So. California

O: 19OCT2020 03:34:43 34.9N 116.3W Mw=3.5 EMSC SOUTHERN CALIFORNIA

P: 19OCT2020 127951 35.6N 118.4W 2.5-4.3 AABAA So. California

O: 18OCT2020 17:44:14 36.0N 117.4W Ml=2.2 EMSC CENTRAL CALIFORNIA

P: 15OCT2020 127917 36.0N 117.9W 2.5-4.3 BAAAA California/Nevada area

O: 19OCT2020 02:34:19 37.6N 118.5W Md=2.6 EMSC CENTRAL CALIFORNIA

P: 16OCT2020 127918 37.3N 118.3W 2.5-4.4 BAAAA California/Nevada area

O: 19OCT2020 07:42:01 38.1N 117.9W ml=2.1 EMSC NEVADA

O: 18OCT2020 18:46:01 38.2N 117.8W ml=2.1 EMSC NEVADA

P: 17OCT2020 127917 37.4N 117.2W 2.5-4.3 AAAAA California/Nevada area

O: 18OCT2020 07:01:56 40.4N 124.3W ML=3.0 EMSC NORTHERN CALIFORNIA

P: 16OCT2020 127989 40.2N 124.2W 2.5-4.3 AAAAA Off Coast of No. Calif

NEIC reported this earthquake of M 3.4 in Northern California was felt with intensity II-III in the area(s) of Northern California in Fortuna, Loleta and Eureka.

ALASKA

O: 18OCT2020 23:46:09 57.4N 154.8W ML=3.1 EMSC KODIAK ISLAND REGION, ALASKA

P: 16OCT2020 128025 60.3N 153.0W 3.2-4.8 ACAAA Central Alaska

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

O: 18OCT2020 14:58:45 48.2N 121.6W Ml=2.1 EMSC WASHINGTON

P: 19OCT2020 128004 48.9N 122.1W 2.0-3.9 AAAAA Washington state, U.S.

O: 18OCT2020 16:46:37 62.3N 124.4W mb=4.3 EMSC NORTHWEST TERRITORIES, CANADA

O: 18OCT2020 16:46:38 62.1N 124.7W MB=4.8 ECAN OF WRIGLEY, NT

P: 22OCT2020 128034 62.1N 124.2W 2.5-3.8 AAAAA Northwest Terr., Canada

P: 22OCT2020 128034 62.1N 124.2W 2.5-3.8 CAAAA Northwest Terr., Canada

O: 18OCT2020 23:50:31 48.7N 123.3W Ml=2.4 EMSC VANCOUVER ISLAND, CANADA REGIO

P: 16OCT2020 128004 48.4N 123.2W 2.0-3.9 AAAAA Washington state, U.S.

ROCKY MOUNTAINS REGION

O: 18OCT2020 11:13:04 31.6N 104.3W ML=2.7 EMSC WESTERN TEXAS

P: 16OCT2020 127946 32.6N 104.6W 2.0-3.8 AAAAA SW U.S.A

O: 18OCT2020 07:34:09 44.3N 115.2W ML=2.5 EMSC SOUTHERN IDAHO

O: 18OCT2020 11:49:24 44.6N 115.1W Ml=2.8 EMSC SOUTHERN IDAHO

O: 18OCT2020 07:34:09 44.3N 115.2W ML=2.5 EMSC SOUTHERN IDAHO

P: 14OCT2020 127978 44.5N 115.2W 2.0-3.9 BAAAA Montana/Idaho

EASTERN U.S./CANADA

O: 18OCT2020 22:47:53 36.2N 98.4W mb=2.2 EMSC OKLAHOMA

O: 19OCT2020 06:31:43 36.3N 98.2W ML=2.0 EMSC OKLAHOMA

P: 17OCT2020 127957 37.0N 98.0W 2.0-3.8 AAAAA Southern Plains

NEIC reported this earthquake of M 2.7 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma at Isabella.

HAWAII

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

MODERATELY LARGE QUAKE IN SOUTHERN ECUADOR

EARTHQUAKE SUMMARY FOR OCTOBER 17, 2020

The strongest earthquake in the world today was an M 5.5 off the west coast of northern Peru and Ecuador. NEIC reported it was felt with maximum intensity IV in Piura, Peru at El Alto, Mancora and Talara and in Zorritos Tumbes, Peru.

It occurred near local solar midnight and may have been promoted by strong tidal stresses with the new moon as noted in previous issues of this summary:

It may also have been affected by a C 3.5 solar flare which occurred earlier in the day and was the strongest such observed flare since late May, 2020. Northern Peru lies near the geomagnetic equator where effects of such flares are prominent.

The last earthquake in northern Peru within about 200 km of this epicenter with M>=5.5 was an M 5.5 on August 25, 2020 and prior to that an M 5.6 on June 5, 2017. Forecast 127856 had expected today's event in Ecuador was likely around October 16.

O: 18OCT2020 06:58:30 3.9S 81.8W Mw=5.5 EMSC NEAR COAST OF NORTHERN PERU

P: 16OCT2020 127856 1.0S 81.0W 4.0-5.3 ACAAA Ecuador

Other moderately large earthquakes today hit the Pacific-Antarctic Ridge with M 5.4 and Sumatra (M 5.3). The event in the South Pacific is the largest on the Pacific-Antarctic Ridge within about 300 km of this epicenter since an M 5.8 on August 31, 2020 and prior to that an M 5.4 on October 7, 2018. This event is at 101 degrees from the M 6.8 in the central Atlantic of September 18, the largest earthquake in the world since that time and may have been promoted by energy from that source.

O: 17OCT2020 10:49:20 54.5S 133.0W Mw=5.4 EMSC PACIFIC-ANTARCTIC RIDGE

The M 5.3 south of Sumatra continued a swarm in the area which began with an M 5.4 on October 15, 2020. It is the second largest event in this swarm to date.

It occurred near local solar midnight and may have affected by high tidal stresses with the new moon. Forecast 127869 had expected activity in this area south of Sumatra was likely around October 21.

O: 17OCT2020 20:21:48 3.2S 100.3E ML=4.0 EMSC KEP. MENTAWAI REGION, INDONESI

O: 17OCT2020 17:54:59 3.3S 100.4E mb=5.3 EMSC KEP. MENTAWAI REGION, INDONESI

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 BBBAA So. of Sumatera

The strongest earthquake in the U.S. or Canada today was an M 4.1 in the Kodiak region, Alaska. The last earthquake in the Kodiak area of M>=4.0 was an M 4.2 on September 21, 2020 but the last within about 100 km of today's epicenter was an M 5.1 on July 8, 2020. Forecast 128007 had expected today's activity was likely around October 18.

O: 17OCT2020 09:17:57 56.2N 154.5W Mw=4.1 EMSC KODIAK ISLAND REGION, ALASKA

P: 18OCT2020 128007 54.7N 156.9W 3.5-4.8 ABBAA Alaska Peninsula

A series of light earthquakes were recorded near Mt. Etna, Sicily, Italy today.

This may be an expansion of the volcanic eruption at Etna which began on October 7, 2020 and has included strong ash emissions. The strongest of today's earthquakes in Sicily occurred near local solar noon and may have been enhanced by high tidal stresses associated with the new moon. Forecast 127972 had expected today's activity was likely in mid-October. This activity is at 103 degrees from the M 6.8 in Atacama, Chile of September 1 and may have been affected by concentrated energy from that source.

O: 17OCT2020 08:40:53 37.8N 14.6E ML=2.0 EMSC SICILY, ITALY

O: 17OCT2020 08:44:54 37.8N 14.6E ML=2.8 EMSC SICILY, ITALY

O: 17OCT2020 09:00:40 37.8N 14.6E ML=2.3 EMSC SICILY, ITALY

O: 17OCT2020 10:31:09 37.8N 14.6E ML=2.2 EMSC SICILY, ITALY

O: 17OCT2020 11:13:58 37.8N 14.6E ML=2.4 EMSC SICILY, ITALY

O: 17OCT2020 11:48:24 37.8N 14.6E ML=2.8 EMSC SICILY, ITALY

O: 17OCT2020 12:29:14 37.8N 14.6E ML=3.3 EMSC SICILY, ITALY

O: 17OCT2020 13:07:43 37.8N 14.6E ML=2.2 EMSC SICILY, ITALY

O: 17OCT2020 13:14:45 37.8N 14.6E ML=2.1 EMSC SICILY, ITALY

O: 17OCT2020 13:27:34 37.8N 14.6E ML=2.1 EMSC SICILY, ITALY

O: 17OCT2020 13:55:19 37.8N 14.6E ML=2.2 EMSC SICILY, ITALY

O: 17OCT2020 15:06:46 37.8N 14.6E ML=2.2 EMSC SICILY, ITALY

O: 17OCT2020 15:09:07 37.8N 14.6E ML=2.1 EMSC SICILY, ITALY

O: 17OCT2020 15:59:11 37.8N 14.6E ML=2.7 EMSC SICILY, ITALY

O: 17OCT2020 20:14:08 37.8N 14.6E ML=2.5 EMSC SICILY, ITALY

O: 18OCT2020 02:41:14 37.8N 14.6E ML=2.2 EMSC SICILY, ITALY

O: 18OCT2020 06:02:23 37.8N 14.7E ML=2.8 EMSC SICILY, ITALY

O: 17OCT2020 12:11:24 37.9N 14.6E ML=2.9 EMSC SICILY, ITALY

O: 17OCT2020 18:50:20 37.9N 14.7E ML=2.4 EMSC SICILY, ITALY

O: 18OCT2020 02:15:54 37.9N 14.6E ML=2.9 EMSC SICILY, ITALY

O: 18OCT2020 06:42:33 37.7N 15.0E ML=2.0 EMSC SICILY, ITALY

P: 15OCT2020 127972 40.0N 17.0E 3.0-4.9 BCBAA Italy

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 17OCT2020 15:03:13 23.3N 120.4E mb=4.5 EMSC TAIWAN

O: 17OCT2020 12:07:55 23.3N 120.4E ML=4.2 TAI Hualien, Taiwan

O: 17OCT2020 15:03:13 23.3N 120.4E ML=5.2 TAI Hualien, Taiwan

O: 17OCT2020 15:05:59 23.3N 120.4E ML=4.7 TAI Hualien, Taiwan

P: 15OCT2020 127913 23.0N 122.0E 4.0-5.3 AAAAA Taiwan

P: 17OCT2020 127913 21.0N 120.0E 4.0-5.4 ACAAA Taiwan

NEIC reported this earthquake of M 4.4 in Taiwan was felt with intensity V-VI in the area(s) of Taiwan in Tainan, Chiayi; and III-IV in Taichung.

CWB reported the M 5.2 was felt in Taiwan with intensity IV in Tainan, Chiayi, Yunlin; III in Kaohsiung, Changhua; II in Nantou, Taitung, Penghu, Hualien, Taichung, Miaoli, and I in Pingtung, Yilan and Hsinchu Counties.

The M 4.7 and 4.2 were felt with slightly lesser intensity in the same areas.

O: 17OCT2020 16:19:45 32.0N 69.1E mb=4.4 EMSC CENTRAL AFGHANISTAN

P: 16OCT2020 127944 34.0N 70.0E 3.8-5.1 ABAAA Pakistan

O: 18OCT2020 06:14:37 37.3N 71.9E mb=4.4 EMSC TAJIKISTAN

P: 22OCT2020 127929 36.0N 72.0E 3.8-5.1 BBAAA Hindu Kush/Pakistan

O: 17OCT2020 22:45:26 38.1N 76.8E mb=4.4 EMSC SOUTHERN XINJIANG, CHINA

P: 18OCT2020 127929 38.0N 74.0E 3.8-5.1 AABAA Hindu Kush/Pakistan

O: 17OCT2020 17:21:09 54.1N 86.2E mb=4.7 EMSC SOUTHWESTERN SIBERIA, RUSSIA

P: 21OCT2020 128020 50.0N 88.0E 3.0-4.3 BCAAA So. Siberia

NEIC reported this earthquake of M 4.7 in Siberia, Russia was felt with intensity II-III in the area(s) of Siberia, Russia in Kemerovo at Krasnobrodskiy, Prokopyevsk (IV) and Novokuznetsk.

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

INDONESIA AND PHILIPPINES

O: 17OCT2020 14:24:18 0.0S 130.2E ML=4.3 EMSC PAPUA REGION, INDONESIA

O: 18OCT2020 02:19:49 0.2S 130.2E ML=4.1 EMSC PAPUA REGION, INDONESIA

P: 20OCT2020 127855 1.0S 127.0E 4.0-5.3 AACAA Ceram area

O: 18OCT2020 03:51:09 0.3S 123.0E ML=4.5 EMSC SULAWESI, INDONESIA

P: 20OCT2020 127847 0.0N 124.0E 4.0-5.3 AAAAA Mindanao, Philippines

O: 18OCT2020 06:01:38 2.5N 128.2E mb=4.7 EMSC HALMAHERA, INDONESIA

P: 13OCT2020 127846 4.0N 127.0E 4.0-5.5 BBBAA Halmahera

O: 17OCT2020 09:13:33 3.0S 128.9E ML=4.2 EMSC CERAM SEA, INDONESIA

P: 20OCT2020 127855 1.0S 127.0E 4.0-5.3 BBBAA Ceram area

O: 17OCT2020 20:21:48 3.2S 100.3E ML=4.0 EMSC KEP. MENTAWAI REGION, INDONESI

O: 17OCT2020 17:54:59 3.3S 100.4E mb=5.3 EMSC KEP. MENTAWAI REGION, INDONESI

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 BBBAA So. of Sumatera

O: 17OCT2020 08:08:01 3.8S 134.7E mb=4.5 EMSC PAPUA, INDONESIA

P: 14OCT2020 127872 4.0S 134.0E 4.0-5.4 BAAAA West Irian, PNG

O: 17OCT2020 23:26:58 4.5S 102.9E ML=4.3 EMSC SOUTHERN SUMATRA, INDONESIA

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 BCCAA So. of Sumatera

O: 17OCT2020 14:58:15 4.6N 125.8E mb=4.6 EMSC KEPULAUAN SANGIHE, INDONESIA

P: 17OCT2020 127848 4.0N 126.0E 4.0-5.3 AAAAA Mindanao, Philippines

O: 17OCT2020 20:58:32 6.1S 122.5E mb=4.5 EMSC FLORES SEA

P: 10OCT2020 127612 7.0S 123.0E 4.0-5.3 CAAAA Flores Island area

O: 17OCT2020 12:48:06 7.5S 128.5E ML=4.3 EMSC KEPULAUAN BARAT DAYA, INDONESI

P: 14OCT2020 127853 6.0S 128.0E 4.0-5.3 BBAAA Banda Sea

O: 17OCT2020 12:57:09 10.5N 122.1E ML=4.2 EMSC PANAY, PHILIPPINES

P: 21OCT2020 127884 12.0N 122.0E 3.5-4.8 BBAAA Luzon, Philippines

O: 18OCT2020 05:46:54 11.2N 126.0E mb=4.8 EMSC SAMAR, PHILIPPINES

P: 21OCT2020 127884 12.0N 122.0E 3.5-4.8 BACAA Luzon, Philippines

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

O: 18OCT2020 06:07:03 17.5N 145.4E mb=4.5 EMSC ALAMAGAN REG, N. MARIANA ISLAN

P: 18OCT2020 127889 16.0N 145.0E 4.0-5.3 ABAAA No. Marianas

CENTRAL AND SOUTH AMERICA

O: 17OCT2020 22:17:40 10.7S 78.4W ML=4.3 EMSC NEAR COAST OF CENTRAL PERU

P: 21OCT2020 127864 9.0S 80.0W 4.0-5.3 BBBAA No. Peru

O: 17OCT2020 10:46:12 10.9N 63.8W mb=4.5 EMSC ISLA DE MARGARITA, VENEZUELA R

P: 14OCT2020 127898 11.0N 63.0W 3.4-4.9 BAAAA Windward Islands

NEIC reported this earthquake of M 4.5 in Northern Venezuela was felt with intensity III-IV in the area(s) of Northern Venezuela Porlamar, La Asuncion, Chacao and Baruta.

O: 18OCT2020 06:58:30 3.9S 81.8W Mw=5.5 EMSC NEAR COAST OF NORTHERN PERU

P: 16OCT2020 127856 1.0S 81.0W 4.0-5.3 ACAAA Ecuador

O: 17OCT2020 08:18:14 14.4N 92.2W ML=4.1 EMSC OFFSHORE GUATEMALA

P: 19OCT2020 127877 14.0N 93.0W 3.5-5.1 AAAAA Chiapas, Mexico

O: 17OCT2020 08:29:45 15.0N 94.2W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO

P: 13OCT2020 127877 14.0N 94.0W 3.5-5.0 BAAAA Chiapas, Mexico

O: 17OCT2020 12:31:12 15.7N 95.1W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO

O: 18OCT2020 03:06:06 15.9N 96.6W ML=4.0 EMSC OAXACA, MEXICO

O: 17OCT2020 18:32:49 15.6N 97.9W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO

P: 18OCT2020 127891 15.0N 97.0W 3.5-5.1 AAAAA Oaxaca, Mexico

O: 17OCT2020 11:42:18 18.2N 67.2W Md=3.0 EMSC MONA PASSAGE, PUERTO RICO

P: 21OCT2020 127893 18.0N 67.0W 3.4-4.8 BAAAA Puerto Rico

O: 17OCT2020 19:02:08 18.8N 70.3W ML=3.3 EMSC DOMINICAN REPUBLIC

O: 17OCT2020 18:55:18 18.9N 70.2W ML=3.1 EMSC DOMINICAN REPUBLIC

O: 17OCT2020 14:20:31 19.0N 69.3W ML=3.2 EMSC DOMINICAN REPUBLIC REGION

O: 17OCT2020 15:08:28 19.1N 70.6W ML=3.1 EMSC DOMINICAN REPUBLIC

O: 17OCT2020 07:24:55 19.7N 70.2W ML=3.1 EMSC DOMINICAN REPUBLIC REGION

O: 17OCT2020 17:42:37 19.7N 71.1W ML=3.4 EMSC DOMINICAN REPUBLIC

O: 18OCT2020 02:13:20 19.9N 70.6W ML=3.1 EMSC DOMINICAN REPUBLIC REGION

O: 18OCT2020 01:58:18 20.0N 70.6W ML=3.1 EMSC DOMINICAN REPUBLIC REGION

O: 17OCT2020 19:37:37 18.2N 72.1W ML=3.2 EMSC HAITI REGION

P: 15OCT2020 127894 19.0N 71.0W 3.4-4.9 AAAAA Puerto Rico

O: 17OCT2020 21:21:35 19.2N 68.9W ML=3.1 EMSC DOMINICAN REPUBLIC REGION

P: 13OCT2020 127900 20.0N 69.0W 3.0-4.3 BAAAA Bahamas/No. Caribbean

O: 18OCT2020 00:57:35 28.3S 68.7W mb=4.5 EMSC LA RIOJA, ARGENTINA

P: 18OCT2020 128061 29.0S 68.0W 4.0-5.3 AAAAA Argentina

O: 17OCT2020 17:59:30 24.9N 110.8W ML=4.0 EMSC BAJA CALIFORNIA SUR, MEXICO

P: 18OCT2020 127903 24.0N 109.0W 3.5-4.8 AABAA Gulf of California

O: 18OCT2020 00:04:26 31.5S 69.5W mb=4.0 EMSC SAN JUAN, ARGENTINA

O: 17OCT2020 19:12:37 30.9S 71.4W ML=4.0 EMSC COQUIMBO, CHILE

P: 17OCT2020 128073 31.0S 70.0W 4.0-5.4 AAAAA Central Chile

AFRICA AND EUROPE

O: 18OCT2020 04:36:34 32.2N 16.9W mb=4.2 EMSC MADEIRA ISLANDS, PORTUGAL REGI

O: 17OCT2020 08:40:53 37.8N 14.6E ML=2.0 EMSC SICILY, ITALY

O: 17OCT2020 08:44:54 37.8N 14.6E ML=2.8 EMSC SICILY, ITALY

O: 17OCT2020 09:00:40 37.8N 14.6E ML=2.3 EMSC SICILY, ITALY

O: 17OCT2020 10:31:09 37.8N 14.6E ML=2.2 EMSC SICILY, ITALY

O: 17OCT2020 11:13:58 37.8N 14.6E ML=2.4 EMSC SICILY, ITALY

O: 17OCT2020 11:48:24 37.8N 14.6E ML=2.8 EMSC SICILY, ITALY

O: 17OCT2020 12:29:14 37.8N 14.6E ML=3.3 EMSC SICILY, ITALY

O: 17OCT2020 13:07:43 37.8N 14.6E ML=2.2 EMSC SICILY, ITALY

O: 17OCT2020 13:14:45 37.8N 14.6E ML=2.1 EMSC SICILY, ITALY

O: 17OCT2020 13:27:34 37.8N 14.6E ML=2.1 EMSC SICILY, ITALY

O: 17OCT2020 13:55:19 37.8N 14.6E ML=2.2 EMSC SICILY, ITALY

O: 17OCT2020 15:06:46 37.8N 14.6E ML=2.2 EMSC SICILY, ITALY

O: 17OCT2020 15:09:07 37.8N 14.6E ML=2.1 EMSC SICILY, ITALY

O: 17OCT2020 15:59:11 37.8N 14.6E ML=2.7 EMSC SICILY, ITALY

O: 17OCT2020 20:14:08 37.8N 14.6E ML=2.5 EMSC SICILY, ITALY

O: 18OCT2020 02:41:14 37.8N 14.6E ML=2.2 EMSC SICILY, ITALY

O: 18OCT2020 06:02:23 37.8N 14.7E ML=2.8 EMSC SICILY, ITALY

O: 17OCT2020 12:11:24 37.9N 14.6E ML=2.9 EMSC SICILY, ITALY

O: 17OCT2020 18:50:20 37.9N 14.7E ML=2.4 EMSC SICILY, ITALY

O: 18OCT2020 02:15:54 37.9N 14.6E ML=2.9 EMSC SICILY, ITALY

O: 18OCT2020 06:42:33 37.7N 15.0E ML=2.0 EMSC SICILY, ITALY

P: 15OCT2020 127972 40.0N 17.0E 3.0-4.9 BCBAA Italy

O: 17OCT2020 20:31:58 39.1N 23.5E ML=3.8 EMSC AEGEAN SEA

P: 18OCT2020 127915 39.0N 23.0E 3.0-4.4 AAAAA Aegean Sea

NEIC reported this earthquake of M 4.0 in Northern Greece was felt with intensity II-III in the area(s) of Northern Greece at Skopeios (IV) and Skiathos, Magnisia.

O: 17OCT2020 22:02:59 66.1N 17.4W ML=3.1 EMSC ICELAND REGION

P: 15OCT2020 128029 66.0N 16.0W 3.0-4.4 AAAAA Iceland area

SOUTHWEST PACIFIC

O: 18OCT2020 05:50:12 19.1S 177.3W mb=4.3 EMSC FIJI REGION

P: 16OCT2020 128055 18.0S 178.0W 4.0-5.3 ABAAA Tonga Islands

O: 17OCT2020 20:59:29 25.7S 179.8E mb=4.4 EMSC SOUTH OF FIJI ISLANDS

P: 19OCT2020 128072 23.0S 179.0E 4.0-5.4 ACAAA Tonga/Fiji

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

OCEAN RIDGES

O: 17OCT2020 10:49:20 54.5S 133.0W Mw=5.4 EMSC PACIFIC-ANTARCTIC RIDGE

O: 18OCT2020 00:05:12 62.3S 58.1W mb=5.0 EMSC SOUTH SHETLAND ISLANDS

P: 14OCT2020 128092 61.0S 58.0W 4.0-5.4 BBAAA Southern Ocean

ZEALANDIA AND AUSTRALIA REGION

O: 18OCT2020 03:28:35 29.0S 178.4W mb=4.8 EMSC KERMADEC ISLANDS, NEW ZEALAND

P: 21OCT2020 128065 29.0S 178.0W 4.0-5.4 BAAAA No. Kermadec Islands

O: 17OCT2020 12:56:33 31.4S 179.7E mb=4.2 EMSC KERMADEC ISLANDS REGION

P: 17OCT2020 128077 33.0S 178.0E 4.0-5.3 ABBAA No. Kermadec Islands

O: 17OCT2020 14:19:36 31.5S 177.7W mb=4.8 EMSC KERMADEC ISLANDS REGION

P: 14OCT2020 128081 31.0S 178.0W 4.0-5.3 BAAAA So. Kermadec Islands

O: 18OCT2020 02:20:13 33.7S 179.3E ML=4.2 EMSC SOUTH OF KERMADEC ISLANDS

P: 17OCT2020 128077 33.0S 178.0E 4.0-5.3 AAAAA No. Kermadec Islands

O: 17OCT2020 21:26:49 41.0S 173.1E ML=3.8 EMSC COOK STRAIT, NEW ZEALAND

P: 16OCT2020 128085 42.0S 173.0E 3.0-4.8 AAAAA So. Island, N.Z.

JAPAN AND KURIL ISLANDS

No earthquakes of M>=4 were located in Japan or the Kuril Islands today.

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 17OCT2020 14:24:49 32.0N 115.9W ML=2.3 EMSC BAJA CALIFORNIA, MEXICO

P: 16OCT2020 127949 32.4N 115.8W 2.5-4.3 AAAAA So. California

O: 17OCT2020 17:10:16 32.0N 116.1W ML=3.5 EMSC BAJA CALIFORNIA, MEXICO

P: 19OCT2020 127948 31.9N 116.3W 2.5-4.3 AAAAA So. California

O: 18OCT2020 03:11:44 33.7N 116.8W Ml=2.0 EMSC SOUTHERN CALIFORNIA

P: 14OCT2020 127948 33.0N 116.3W 2.5-4.3 BAAAA So. California

O: 17OCT2020 09:58:34 35.6N 120.4W ML=2.8 EMSC CENTRAL CALIFORNIA

P: 17OCT2020 127943 35.6N 121.3W 2.5-4.3 AAAAA Off So. California

NEIC reported this earthquake of M 3.0 in Central California was felt with intensity II-III in the area(s) of Central California at Shandon, Atascadero and Templeton.

O: 18OCT2020 03:24:31 35.7N 117.5W ML=2.1 EMSC SOUTHERN CALIFORNIA

P: 15OCT2020 127917 36.0N 117.9W 2.5-4.3 BAAAA California/Nevada area

O: 17OCT2020 11:15:45 36.6N 121.3W Md=2.6 EMSC CENTRAL CALIFORNIA

P: 15OCT2020 127921 36.4N 121.0W 2.5-4.3 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 San Juan Bautista and Los Banos.

O: 17OCT2020 20:14:51 37.0N 121.6W Md=2.2 EMSC NORTHERN CALIFORNIA

P: 17OCT2020 127922 37.1N 121.5W 2.5-4.3 AAAAA Central California

O: 17OCT2020 10:55:35 37.5N 118.8W Md=2.2 EMSC CENTRAL CALIFORNIA

P: 16OCT2020 127918 37.3N 118.3W 2.5-4.4 AAAAA California/Nevada area

O: 18OCT2020 06:37:30 38.0N 121.8W Md=2.0 EMSC SAN FRANCISCO BAY AREA, CALIF.

P: 14OCT2020 127923 37.8N 122.6W 2.5-4.3 BAAAA Central California

O: 17OCT2020 13:25:55 38.2N 117.9W ml=2.5 EMSC NEVADA

P: 13OCT2020 127918 37.9N 118.2W 2.5-4.4 BAAAA California/Nevada area

O: 17OCT2020 18:49:40 38.8N 122.8W Md=2.0 EMSC NORTHERN CALIFORNIA

P: 16OCT2020 127924 38.7N 122.7W 2.5-4.3 AAAAA Central California

O: 17OCT2020 07:30:26 40.5N 126.0W ML=2.9 EMSC OFF COAST OF NORTHERN CALIFORN

P: 18OCT2020 127990 40.9N 126.3W 2.5-4.3 AAAAA Off Coast of No. Calif

ALASKA

O: 17OCT2020 09:17:57 56.2N 154.5W Mw=4.1 EMSC KODIAK ISLAND REGION, ALASKA

P: 18OCT2020 128007 54.7N 156.9W 3.5-4.8 ABBAA Alaska Peninsula

O: 17OCT2020 19:49:35 65.4N 163.4W ml=3.0 EMSC NORTHERN ALASKA

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

O: 17OCT2020 23:06:05 48.9N 122.2W Ml=2.3 EMSC WASHINGTON

P: 19OCT2020 128004 48.9N 122.1W 2.0-3.9 AAAAA Washington state, U.S.

ROCKY MOUNTAINS REGION

O: 17OCT2020 14:28:28 44.0N 114.4W Ml=2.5 EMSC SOUTHERN IDAHO

P: 20OCT2020 127978 44.4N 114.1W 2.0-3.8 BAAAA Montana/Idaho

O: 17OCT2020 07:11:47 44.3N 115.2W Ml=2.0 EMSC SOUTHERN IDAHO

P: 14OCT2020 127978 44.5N 115.2W 2.0-3.9 BAAAA Montana/Idaho

EASTERN U.S./CANADA

O: 17OCT2020 07:12:44 35.4N 85.2W Md=2.3 EMSC EASTERN TENNESSEE

P: 16OCT2020 127930 35.0N 82.0W 2.0-3.9 AACAA Kentucky/Tennessee/NC

O: 17OCT2020 21:37:49 36.9N 97.5W mb=2.6 EMSC OKLAHOMA

P: 17OCT2020 127957 37.0N 98.0W 2.0-3.8 AAAAA Southern Plains

HAWAII

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

MODERATE QUAKE SHAKES MINDORO, PHILIPPINES

EARTHQUAKE SUMMARY FOR OCTOBER 16, 2020

The strongest earthquake in the world today was an M 5.3-5.4 in Mindoro, Philippines. NEIC reported it was felt with maximum intensity VI in Southern Tagalog at Malig and IV in Batangas and Tagaylay. Intensity II-III was felt in Southern Tagalog at Nasugbu, Taal, Lumil, Dasmariana, Binan, Imus and Magsaysay, Quezon. PHIVOLCS reported this earthquake was felt with intensity V in Looc and Lubang, Occidental Mindoro; IV in Abra de Ilog and Sablayan, Occidental Mindoro; Calapan City, Oriental Mindoro, Lian, Lemeryu and Tingloy, Batangas; Tagaytay City, Mendez, Amadeo and Alfonso, Cavite; III in Puerto Galera, Oriental Mindoro; Paluan, Rizal and Mamburao, Occidental Mindoro; San Pascual, Batangas; Binan and Cabuyao, Laguna; City of Manila; Muntinlupa City, Makati City; Quezon City; Pasig City; Cainta, Rizal; II in Soccoro, Pinamalayan, Bansud, Naujan, and San Teodoro, Oriental Mindoor; San Pascual, Batangas; Indang, Cavite; Marikina City; Malabon City, Meycauauan City, Bulacan; Floridablanca, Pampanga and I in Pola, Oriental Mindoro; Calintaan, Occidental Mindoro. This continues activation of the region of central Philippines which began earlier this week and has included moderate events in Panay, Mindanao, Samar and Mindoro. The event in Mindoro of October 4 was an M 5.6. This activity may be related to the passage of Tropical Storm Nangka which passed through this region several days ago as noted at the time:

"TS Nangka (TD 18W) continued today west of Samar, Philippines with winds up to 55 kts. It is expected to track to the west over the next several days reaching Vietnam around October 11. Seismicity in southeast Asia is expected to be enhanced by this storm at landfall." (October 12-15, 2020)

Forecast 127884 had expected today's event was likely within about 150 km of this epicenter around October 14. Today's event is at 144 degrees from the M 6.8 of September 18 in the Central Atlantic and was probably promoted by concentrated energy from that source.

O: 16OCT2020 20:06:27 13.7N 120.4E Mw=5.3 EMSC MINDORO, PHILIPPINES

P: 14OCT2020 127884 13.0N 122.0E 3.5-4.8 AABAA Luzon, Philippines

The largest earthquake in the U.S. or Canada today was an M 4.0-4.1 in the Queen Charlotte Islands region of Canada. It was reported lightly felt in the epicentral area. This earthquake may have been promoted by tidal stresses associated with the new moon today as described in previous issues of this summary:

The last earthquake within about 100 km of this epicenter with M>=4 was an M 4.2 on August 19, 2020. The last of significantly larger magnitude was an M 5.2 on May 23, 2020. In both cases (as with today's event) these two earthquakes occurred on the date of the new moon suggesting tidal triggering in the region and had been noted as such in this summary, for example:

"The largest earthquake in the U.S or Canada today was an M 5.2 west of Vancouver Island, British Columbia, Canada. NEIC reported intensity II-III felt within about 500 km of the epicenter at Ucluelet, and Walnut Grove, British Columbia. This epicenter is at 103 degrees from the M 7.3 of May 5 in the Banda Sea and was probably promoted by energy from that source.

It was associated with the new moon today when tidal stresses were high and was probably enhanced by these tidal stresses" (May 23, 2020)

Forecast 128010 had expected today's event was likely within about 100 km around October 17. This epicenter is at 104 degrees from the M 6.8 on October 21, 2020 in the Banda Sea and may have been affected by concentrated energy from that source.

O: 16OCT2020 13:56:33 51.0N 130.7W MB=4.1 ECAN Bella Bella, BC

O: 16OCT2020 13:56:33 51.1N 130.3W ML=4.0 EMSC QUEEN CHARLOTTE ISLANDS REGION

P: 17OCT2020 128010 50.3N 130.2W 3.0-5.1 AAAAA British Colombia

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 17OCT2020 01:16:35 24.0N 121.7E ML=4.4 TAI Hualien, Taiwan

P: 15OCT2020 127913 23.0N 122.0E 4.0-5.3 AAAAA Taiwan

CWB reported this earthquake was felt with intensity II in Hualien and Nantou and I in Yilan, Miaoli, Changhua and Yunlin Counties, Taiwan.

O: 17OCT2020 01:16:36 36.5N 71.1E mb=4.4 EMSC HINDU KUSH REGION, AFGHANISTAN

O: 16OCT2020 10:10:52 36.6N 71.3E Mw=4.9 EMSC HINDU KUSH REGION, AFGHANISTAN

P: 22OCT2020 127929 36.0N 72.0E 3.8-5.1 CAAAA Hindu Kush/Pakistan

O: 16OCT2020 08:13:30 29.6N 67.7E mb=4.3 EMSC PAKISTAN

P: 18OCT2020 127910 29.0N 68.0E 3.5-4.8 AAAAA Pakistan

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

INDONESIA AND PHILIPPINES

O: 17OCT2020 05:21:54 0.1S 130.2E ML=4.0 EMSC PAPUA REGION, INDONESIA

P: 20OCT2020 127855 1.0S 127.0E 4.0-5.3 BACAA Ceram area

O: 17OCT2020 05:44:27 1.7N 126.6E ML=4.6 EMSC MOLUCCA SEA

P: 17OCT2020 127848 4.0N 126.0E 4.0-5.3 ACAAA Mindanao, Philippines

O: 17OCT2020 00:36:04 3.2S 100.4E Mw=5.1 EMSC KEP. MENTAWAI REGION, INDONESI

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 BBBAA So. of Sumatera

O: 17OCT2020 02:37:33 6.1S 130.5E mb=4.6 EMSC BANDA SEA

P: 18OCT2020 127873 6.0S 130.0E 4.0-5.3 AAAAA West Irian, PNG

O: 16OCT2020 08:44:31 7.6S 128.6E mb=4.2 EMSC KEPULAUAN BARAT DAYA, INDONESI

P: 14OCT2020 127853 6.0S 128.0E 4.0-5.3 ABAAA Banda Sea

O: 16OCT2020 20:06:27 13.7N 120.4E Mw=5.3 EMSC MINDORO, PHILIPPINES

P: 14OCT2020 127884 13.0N 122.0E 3.5-4.8 AABAA Luzon, Philippines

CENTRAL AND SOUTH AMERICA

O: 16OCT2020 16:05:00 14.5N 93.8W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO

O: 16OCT2020 18:58:27 15.3N 94.4W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO

O: 17OCT2020 06:07:14 15.3N 94.7W ML=4.1 EMSC OFF COAST OF OAXACA, MEXICO

O: 16OCT2020 20:23:58 15.6N 94.0W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO

O: 16OCT2020 18:00:53 14.4N 93.8W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO

P: 19OCT2020 127877 14.0N 93.0W 3.5-5.1 BAAAA Chiapas, Mexico

O: 16OCT2020 07:47:29 15.6N 97.5W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO

P: 18OCT2020 127891 15.0N 97.0W 3.5-5.1 AAAAA Oaxaca, Mexico

O: 17OCT2020 04:16:10 15.7S 74.9W ML=4.1 EMSC NEAR COAST OF SOUTHERN PERU

P: 16OCT2020 128044 15.0S 76.0W 4.0-5.4 AAAAA Central Peru

O: 17OCT2020 04:46:26 16.5S 73.4W ML=4.2 EMSC NEAR COAST OF SOUTHERN PERU

P: 14OCT2020 128052 16.0S 73.0W 4.0-5.4 BAAAA So. Peru/Bolivia

NEIC reported this earthquake of M 4.7 in Central Peru was felt with intensity II-III in the area(s) of Central Peru at Camana, Arequipa.

O: 16OCT2020 18:34:14 18.0N 66.8W ML=3.1 EMSC PUERTO RICO REGION

P: 14OCT2020 127893 18.0N 66.0W 3.4-4.8 AAAAA Puerto Rico

O: 16OCT2020 10:08:04 18.6N 69.5W ML=3.1 EMSC DOMINICAN REPUBLIC

O: 16OCT2020 23:24:43 18.7N 69.4W ML=3.4 EMSC DOMINICAN REPUBLIC

O: 16OCT2020 13:01:14 18.5N 69.2W ML=3.0 EMSC DOMINICAN REPUBLIC

P: 13OCT2020 127900 20.0N 69.0W 3.0-4.3 BBAAA Bahamas/No. Caribbean

O: 17OCT2020 03:53:05 22.6S 70.4W mb=4.3 EMSC OFFSHORE ANTOFAGASTA, CHILE

P: 17OCT2020 128059 21.0S 71.0W 4.0-5.3 ABAAA Argentina

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

AFRICA AND EUROPE

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

SOUTHWEST PACIFIC

O: 17OCT2020 05:19:09 19.4S 173.3W mb=4.9 EMSC TONGA

P: 16OCT2020 128056 19.0S 173.0W 4.0-5.3 AAAAA Tonga Islands

O: 16OCT2020 19:05:01 23.3S 179.1E mb=4.7 EMSC SOUTH OF FIJI ISLANDS

P: 19OCT2020 128072 23.0S 179.0E 4.0-5.4 BAAAA Tonga/Fiji

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

OCEAN RIDGES

O: 16OCT2020 11:12:32 55.4S 28.2W mb=4.7 EMSC SOUTH SANDWICH ISLANDS REGION

P: 18OCT2020 128091 56.0S 27.0W 4.0-5.6 AAAAA So. Sandwich Islands

O: 17OCT2020 04:32:03 73.8N 8.6E Mw=4.5 EMSC GREENLAND SEA

P: 19OCT2020 128038 79.0N 7.0E 4.0-5.3 ACAAA Arctic Ocean Region

O: 16OCT2020 21:30:59 62.1S 57.8W mb=4.7 EMSC SOUTH SHETLAND ISLANDS

O: 16OCT2020 12:06:08 62.4S 58.6W mb=4.9 EMSC SOUTH SHETLAND ISLANDS

P: 14OCT2020 128092 61.0S 58.0W 4.0-5.4 ABAAA Southern Ocean

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

ZEALANDIA AND AUSTRALIA REGION

O: 16OCT2020 12:40:07 34.5S 179.9E ML=3.5 EMSC SOUTH OF KERMADEC ISLANDS

P: 15OCT2020 128078 35.0S 178.0E 4.0-5.3 AABAA No. Kermadec Islands

O: 17OCT2020 04:36:23 37.4S 177.9E ML=4.1 EMSC OFF E. COAST OF N. ISLAND, N.Z

O: 17OCT2020 04:36:23 37.4S 177.9E ML=4.1 GEONET reported felt b

P: 19OCT2020 128078 37.0S 178.0E 3.0-4.3 AAAAA North Island, N.Z.

GEONET reported this earthquake was felt by 13 people with weak intensity by 11 and light intensity by 2 persons and moderate intensity by none. Strong shaking was felt by 0 with none feeling the quake with severe and none with extreme intensity.

JAPAN AND KURIL ISLANDS

O: 16OCT2020 08:34:30 36.8N 140.6E ML=3.8 EMSC NEAR EAST COAST OF HONSHU, JAP

P: 16OCT2020 127942 36.0N 142.0E 4.0-5.3 AAAAA Off East Coast Honshu

O: 17OCT2020 04:00:30 37.0N 138.6E ML=3.9 EMSC NEAR WEST COAST OF HONSHU, JAP

P: 18OCT2020 127937 35.0N 139.0E 3.5-4.9 ABAAA No. Honshu, Japan

O: 17OCT2020 04:48:06 45.4N 149.8E mb=5.2 EMSC KURIL ISLANDS

P: 18OCT2020 127971 44.0N 150.0E 3.5-5.3 ABAAA Hokkaido, Japan

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 16OCT2020 07:25:56 31.5N 115.5W ML=3.4 EMSC BAJA CALIFORNIA, MEXICO

P: 19OCT2020 127948 31.9N 116.3W 2.5-4.3 BAAAA So. California

O: 16OCT2020 20:56:29 33.1N 115.6W Ml=2.2 EMSC SOUTHERN CALIFORNIA

P: 18OCT2020 127949 32.9N 115.6W 2.5-4.3 AAAAA So. California

O: 16OCT2020 18:28:00 33.4N 116.4W ML=2.3 EMSC SOUTHERN CALIFORNIA

P: 14OCT2020 127948 33.0N 116.3W 2.5-4.3 AAAAA So. California

O: 16OCT2020 12:47:37 34.5N 117.9W ML=2.1 EMSC SOUTHERN CALIFORNIA

P: 15OCT2020 127951 34.6N 118.4W 2.5-4.3 AAAAA So. California

O: 16OCT2020 09:00:24 35.8N 117.6W Ml=2.1 EMSC SOUTHERN CALIFORNIA

P: 15OCT2020 127917 36.0N 117.9W 2.5-4.3 AAAAA California/Nevada area

O: 16OCT2020 22:28:07 35.9N 115.1W ml=2.0 EMSC NEVADA

P: 17OCT2020 127917 37.4N 117.2W 2.5-4.3 ABBAA California/Nevada area

O: 17OCT2020 06:29:34 36.0N 120.6W Md=2.3 EMSC CENTRAL CALIFORNIA

P: 14OCT2020 127922 36.6N 120.7W 2.5-4.3 BAAAA Central California

O: 16OCT2020 14:34:02 38.2N 117.8W ml=2.2 EMSC NEVADA

P: 13OCT2020 127918 37.9N 118.2W 2.5-4.4 BAAAA California/Nevada area

O: 16OCT2020 09:54:28 38.8N 122.8W Md=2.1 EMSC NORTHERN CALIFORNIA

O: 16OCT2020 20:50:52 38.8N 122.8W Md=2.3 EMSC NORTHERN CALIFORNIA

P: 16OCT2020 127924 38.7N 122.7W 2.5-4.3 AAAAA Central California

O: 16OCT2020 15:25:23 39.7N 119.9W ml=2.3 EMSC NEVADA

O: 16OCT2020 20:29:05 39.7N 119.9W ml=2.4 EMSC NEVADA

P: 16OCT2020 127919 39.1N 119.6W 2.5-4.3 AAAAA California/Nevada area

ALASKA

O: 17OCT2020 01:14:25 50.6N 178.4E ML=3.2 EMSC RAT ISLANDS, ALEUTIAN ISLANDS

P: 15OCT2020 128019 51.0N 178.0E 4.0-5.5 AAAAA Rat Islands

O: 17OCT2020 02:04:34 56.0N 149.8W ML=3.0 EMSC GULF OF ALASKA

P: 17OCT2020 128032 56.0N 149.0W 3.0-4.5 AAAAA Northern Alaska

O: 16OCT2020 10:39:14 69.5N 144.4W ml=3.3 EMSC NORTHERN ALASKA

P: 16OCT2020 128033 69.0N 144.0W 3.0-4.5 AAAAA Northern Alaska

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

O: 16OCT2020 13:56:33 51.0N 130.7W MB=4.1 ECAN Bella Bella, BC

O: 16OCT2020 13:56:33 51.1N 130.3W ML=4.0 EMSC QUEEN CHARLOTTE ISLANDS REGION

P: 17OCT2020 128010 50.3N 130.2W 3.0-5.1 AAAAA British Colombia

ROCKY MOUNTAINS REGION

O: 16OCT2020 10:20:30 44.3N 115.2W Ml=2.4 EMSC SOUTHERN IDAHO

P: 14OCT2020 127978 44.5N 115.2W 2.0-3.9 AAAAA Montana/Idaho

EASTERN U.S./CANADA

O: 16OCT2020 20:03:38 36.1N 97.6W ML=2.0 EMSC OKLAHOMA

O: 16OCT2020 12:25:34 36.4N 97.4W mb=2.8 EMSC OKLAHOMA

O: 16OCT2020 16:32:40 36.7N 98.8W ML=2.0 EMSC OKLAHOMA

P: 17OCT2020 127957 37.0N 98.0W 2.0-3.8 AAAAA Southern Plains

NEIC reported this earthquake of M 2.8 in Oklahoma was felt with intensity II-III in the area(s) of Oklahoma at Ponca City and Barnsdall.

HAWAII

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

MODERATE SWARM SOUTH OF SUMATRA

EARTHQUAKE SUMMARY FOR OCTOBER 15, 2020

A series of moderate earthquakes followed the largest earthquake in the world today - an M 5.4 in the Mentawai region south of Sumatra. It was not reported felt in the region. The last earthquake within about 200 km of this epicenter with M>=5.4 was an M 5.4-5.5 on August 15, 2020. These appear to be aftershocks of an M 6.8-6.9 on August 18, 2020. This event occurred on the new moon date of August 18. This summary had noted this at the time as:

"The new moon arrived near the time of today's Sumatra earthquakes. This summary had expected strong triggering from this tidal alignment in Indonesia" (August 18-19, 2020)

Forecast 127869 had expected today's event in this region was likely in mid-October. Today's epicenter is located at 100 degrees from the M 7.8 in the Alaska Peninsula event of July 22 and at 147 degrees from the Atacama, Chile M 6.8 of September 1 and may have been promoted by concentrated energy from those sources.

O: 15OCT2020 10:34:10 3.3S 100.3E mb=4.9 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 15OCT2020 22:06:27 3.4S 100.2E mb=4.5 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 15OCT2020 09:41:17 3.2S 100.4E Mw=5.4 EMSC KEP. MENTAWAI REGION, INDONESI

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 CBBAA So. of Sumatera

A moderate earthquake of M 4.0-4.3 in the Strait of Gibraltar, Spain today was followed by an M 2.9 aftershock. NEIC reported this earthquake of M 4.3 in Spain was felt with intensity II-III in the area(s) of Spain at Cortes de al Frontera and Estebona, Malaga. This is the strongest earthquake within about 150 km of this epicenter in nearly a year. The last such event of M>=4 was an M 4.5 on October 25, 2019. Forecast 127932 had expected today's event within this region was likely around October 15. Today's earthquake occurred within about half an hour of local solar midnight and was likely promoted by strong tidal stresses associated with the new moon which arrives today as noted in previous issues of this summary as:

This activity is at 104 degrees from the Sumatra earthquakes earlier in the day and may have been promoted by energy from that source.

O: 15OCT2020 10:58:19 36.6N 5.5W ML=2.9 EMSC STRAIT OF GIBRALTAR

O: 16OCT2020 00:58:51 36.7N 5.4W ML=4.0 EMSC STRAIT OF GIBRALTAR

O: 16OCT2020 00:58:51 36.7N 5.4W ML=4.3 ANSS STRAIT OF GIBRALTAR

P: 15OCT2020 127932 36.0N 4.0W 3.5-4.8 AAAAA Morocco/Spain

The largest earthquake in the U.S. or Canada today was an M 4.0-4.2 in Southern Alaska. NEIC reported it was felt with maximum intensity V in Alaska at Indian and IV in Fort Richardson and II-III in Eagle River, Anchorage, Girdwood, Elmendorf AFB. The only earthquake within about 150 km of this epicenter in the past year was an M 4.2 on June 18, 2020. The last of larger magnitude in this area was an M 5.2 on September 17, 2019. Forecast 128028 had expected today's event was likely around October 16.

O: 15OCT2020 16:05:15 61.2N 149.3W Mw=4.2 EMSC SOUTHERN ALASKA

P: 16OCT2020 128028 62.7N 149.3W 3.2-4.9 ABAAA Central Alaska

Earthquakes in Alabama and Oklahoma today may also have been promoted by strong tidal stresses. The event in Oklahoma of M 2.2 occurred within about 15 minutes of local solar noon while an M 2.5 in Alabama occurred near local solar midnight, prime times for maximum tidal effects on seismicity. Forecast 127707 had expected the event in Alabama was likely in mid-October within about 100 km of this epicenter. An M 2.9 last occurred near today's Alabama event on June 25, 2020 and April 24, 2019.

NEIC reported this earthquake of M 2.6 in Alabama was felt with intensity II-III in the area(s) of Alabama at Vernon, Crane Hill and Pelham; in Starkville, Mississippi, Knoxville, Tennessee and Haworth, Oklahoma.

O: 15OCT2020 07:51:00 33.7N 88.0W Md=2.5 EMSC ALABAMA

P: 9OCT2020 127707 33.0N 87.0W 2.0-3.9 CAAAA Southeast U.S.

The event in Oklahoma was not unusual and had been expected in forecast 127957.

O: 15OCT2020 18:14:53 36.5N 97.2W ML=2.2 EMSC OKLAHOMA

P: 17OCT2020 127957 37.0N 98.0W 2.0-3.8 AAAAA Southern Plains

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 15OCT2020 20:12:53 53.1N 88.0E mb=4.3 EMSC SOUTHWESTERN SIBERIA, RUSSIA

P: 21OCT2020 128020 50.0N 88.0E 3.0-4.3 CCAAA So. Siberia

O: 15OCT2020 13:32:59 54.8N 111.7E mb=4.5 EMSC LAKE BAYKAL REGION, RUSSIA

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

INDONESIA AND PHILIPPINES

O: 15OCT2020 16:52:41 0.5S 98.7E mb=4.4 EMSC KEPULAUAN BATU, INDONESIA

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 CBAAA So. of Sumatera

O: 15OCT2020 15:12:18 1.8S 133.4E ML=4.0 EMSC PAPUA, INDONESIA

P: 14OCT2020 127872 4.0S 134.0E 4.0-5.4 ACAAA West Irian, PNG

O: 15OCT2020 10:47:48 2.2N 127.7E ML=4.3 EMSC MOLUCCA SEA

P: 13OCT2020 127846 4.0N 127.0E 4.0-5.5 ABAAA Halmahera

O: 15OCT2020 09:41:17 3.2S 100.4E Mw=5.4 EMSC KEP. MENTAWAI REGION, INDONESI

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 CBBAA So. of Sumatera

O: 15OCT2020 15:19:20 5.2N 127.1E mb=4.5 EMSC PHILIPPINE ISLANDS REGION

P: 13OCT2020 127846 4.0N 127.0E 4.0-5.5 ABAAA Halmahera

O: 15OCT2020 08:51:39 7.0N 126.0E ML=4.0 EMSC MINDANAO, PHILIPPINES

P: 11OCT2020 127599 7.0N 126.0E 4.0-5.3 BAAAA Central Philippines

O: 16OCT2020 00:27:43 10.5N 122.2E ML=4.5 EMSC PANAY, PHILIPPINES

O: 16OCT2020 00:32:45 10.5N 122.3E mb=4.8 EMSC PANAY, PHILIPPINES

O: 16OCT2020 00:41:59 10.5N 122.0E ML=4.4 EMSC PANAY, PHILIPPINES

O: 15OCT2020 14:48:15 10.5N 122.1E ML=4.1 EMSC PANAY, PHILIPPINES

P: 21OCT2020 127884 12.0N 122.0E 3.5-4.8 CBAAA Luzon, Philippines

O: 15OCT2020 10:34:10 3.3S 100.3E mb=4.9 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 15OCT2020 22:06:27 3.4S 100.2E mb=4.5 EMSC KEP. MENTAWAI REGION, INDONESIA

O: 15OCT2020 09:41:17 3.2S 100.4E Mw=5.4 EMSC KEP. MENTAWAI REGION, INDONESI

P: 21OCT2020 127869 2.0S 99.0E 4.0-5.3 CBBAA So. of Sumatera

CENTRAL AND SOUTH AMERICA

O: 16OCT2020 04:36:01 14.5N 93.9W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO

O: 15OCT2020 17:51:58 14.6N 93.8W ML=4.6 EMSC OFF COAST OF CHIAPAS, MEXICO

P: 13OCT2020 127877 14.0N 94.0W 3.5-5.0 AAAAA Chiapas, Mexico

O: 15OCT2020 21:40:56 15.3N 89.1W Mw=4.1 EMSC GUATEMALA

P: 21OCT2020 127888 16.0N 88.0W 3.5-5.2 CAAAA Nicaragua

O: 15OCT2020 20:21:08 15.5N 94.8W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO

P: 10OCT2020 127630 15.0N 95.0W 3.5-5.1 BAAAA Chiapas, Mexico

P: 13OCT2020 127877 14.0N 94.0W 3.5-5.0 ABAAA Chiapas, Mexico

O: 15OCT2020 18:12:43 15.6N 96.2W ML=4.1 EMSC OFFSHORE OAXACA, MEXICO

P: 18OCT2020 127891 15.0N 97.0W 3.5-5.1 BAAAA Oaxaca, Mexico

O: 15OCT2020 19:50:37 16.3N 98.2W ML=4.1 EMSC OAXACA, MEXICO

P: 7OCT2020 127646 16.0N 98.0W 3.5-5.0 CAAAA Oaxaca, Mexico

O: 15OCT2020 13:44:39 17.3N 94.7W ML=4.1 EMSC VERACRUZ, MEXICO

P: 21OCT2020 127877 17.0N 94.0W 3.5-5.0 CAAAA Chiapas, Mexico

O: 15OCT2020 20:36:41 17.5N 97.4W ML=4.0 EMSC OAXACA, MEXICO

P: 14OCT2020 127891 17.0N 96.0W 3.5-5.0 AABAA Oaxaca, Mexico

O: 15OCT2020 19:49:29 17.9N 67.0W Md=3.0 EMSC PUERTO RICO REGION

O: 16OCT2020 05:51:02 18.0N 66.9W ML=3.3 EMSC PUERTO RICO

O: 15OCT2020 18:06:31 17.8N 67.0W Mw=3.8 EMSC PUERTO RICO REGION

P: 14OCT2020 127893 18.0N 66.0W 3.4-4.8 AAAAA Puerto Rico

NEIC reported this earthquake of M 3.8 in Southwestern Puerto Rico was felt with intensity II-III in the area(s) of Southwestern Puerto Rico in Guanica, Lajas, Sabana Grande, San German, Cabo Rojo, Guayanilla, Mayaguez, Adjuntas, Ponce and Anasco.

O: 15OCT2020 18:25:31 18.2N 100.9W ML=4.0 EMSC GUERRERO, MEXICO

P: 19OCT2020 127886 17.0N 102.0W 3.5-5.2 BBAAA Michoacan, Mexico

O: 15OCT2020 15:13:15 18.4N 69.1W ML=3.2 EMSC DOMINICAN REPUBLIC

P: 13OCT2020 127900 20.0N 69.0W 3.0-4.3 ABAAA Bahamas/No. Caribbean

O: 15OCT2020 09:41:09 20.0N 70.7W ML=3.2 EMSC DOMINICAN REPUBLIC REGION

O: 15OCT2020 14:41:33 20.3N 70.8W ML=3.4 EMSC DOMINICAN REPUBLIC REGION

O: 15OCT2020 08:09:00 20.4N 71.0W ML=3.4 EMSC DOMINICAN REPUBLIC REGION

O: 15OCT2020 23:27:45 18.7N 70.9W ML=3.3 EMSC DOMINICAN REPUBLIC

P: 15OCT2020 127894 19.0N 71.0W 3.4-4.9 AAAAA Puerto Rico

P: 16OCT2020 127900 20.0N 71.0W 3.0-4.4 AAAAA Bahamas/No. Caribbean

O: 16OCT2020 06:34:48 19.0N 108.3W ML=4.2 EMSC REVILLA GIGEDO ISLANDS REGION

P: 8OCT2020 127656 20.0N 109.0W 3.5-4.8 CAAAA Gulf of California

P: 20OCT2020 127879 19.0N 107.0W 3.5-5.1 BAAAA Coast of Jalisco, Mexico

O: 16OCT2020 01:35:47 20.8S 69.1W mb=4.1 EMSC TARAPACA, CHILE

P: 15OCT2020 128063 21.0S 69.0W 4.0-5.4 AAAAA Coast No. Chile

AFRICA AND EUROPE

O: 15OCT2020 10:58:19 36.6N 5.5W ML=2.9 EMSC STRAIT OF GIBRALTAR

O: 16OCT2020 00:58:51 36.7N 5.4W ML=4.0 EMSC STRAIT OF GIBRALTAR

P: 15OCT2020 127932 36.0N 4.0W 3.5-4.8 AAAAA Morocco/Spain

O: 16OCT2020 05:42:24 61.6N 3.3E ML=3.0 EMSC NORWEGIAN SEA

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

SOUTHWEST PACIFIC

O: 16OCT2020 06:25:45 11.7S 166.8E mb=4.7 EMSC SANTA CRUZ ISLANDS

P: 18OCT2020 128057 11.0S 167.0E 4.0-5.4 AAAAA Vanuatu Islands

O: 15OCT2020 22:41:37 20.8S 177.7W mb=4.2 EMSC FIJI REGION

P: 6OCT2020 127804 20.0S 178.0W 4.0-5.3 CAAAA Tonga Islands

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

OCEAN RIDGES

O: 16OCT2020 00:08:22 8.1N 38.0W mb=5.0 EMSC CENTRAL MID-ATLANTIC RIDGE

P: 15OCT2020 127840 8.0N 37.0W 4.0-5.6 AAAAA Central Mid-Atlantic Ridg

ZEALANDIA AND AUSTRALIA REGION

O: 15OCT2020 14:09:31 31.2S 177.9W mb=4.7 EMSC KERMADEC ISLANDS REGION

O: 15OCT2020 07:00:17 31.5S 177.6W mb=5.1 EMSC KERMADEC ISLANDS REGION

P: 14OCT2020 128081 31.0S 178.0W 4.0-5.3 AAAAA So. Kermadec Islands

JAPAN AND KURIL ISLANDS

O: 15OCT2020 15:20:04 33.9N 136.9E mb=4.0 EMSC NEAR S. COAST OF WESTERN HONSH

P: 17OCT2020 127926 34.0N 136.0E 3.5-4.8 AAAAA Central/So. Honshu Japan

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 15OCT2020 21:13:21 33.1N 115.6W ML=2.2 EMSC SOUTHERN CALIFORNIA

O: 15OCT2020 11:54:19 33.1N 115.6W Ml=2.3 EMSC SOUTHERN CALIFORNIA

P: 14OCT2020 127948 33.0N 116.3W 2.5-4.3 AAAAA So. California

P: 16OCT2020 127949 32.4N 115.8W 2.5-4.3 AAAAA So. California

O: 16OCT2020 03:46:28 35.9N 117.6W ML=2.1 EMSC CENTRAL CALIFORNIA

P: 15OCT2020 127917 36.0N 117.9W 2.5-4.3 AAAAA California/Nevada area

O: 16OCT2020 04:32:00 36.9N 121.6W Md=2.3 EMSC CENTRAL CALIFORNIA

O: 15OCT2020 15:17:03 37.0N 121.6W Md=2.5 EMSC NORTHERN CALIFORNIA

P: 17OCT2020 127922 37.1N 121.5W 2.5-4.3 AAAAA Central California

NEIC reported this earthquake of M 2.5 in Central California was felt with intensity II-III in the area(s) of Central California at Gilroy, Watsonville, San Juan Bautista, Morgan Hill, Los Banos, Mountain View, Fremont, San Ramon.

O: 15OCT2020 19:31:35 37.3N 118.1W ml=2.3 EMSC CENTRAL CALIFORNIA

P: 16OCT2020 127918 37.3N 118.3W 2.5-4.4 AAAAA California/Nevada area

O: 15OCT2020 14:52:04 38.5N 118.0W ml=2.2 EMSC NEVADA

P: 13OCT2020 127918 37.9N 118.2W 2.5-4.4 AAAAA California/Nevada area

O: 16OCT2020 06:35:21 39.2N 119.6W ML=2.7 EMSC NEVADA

P: 16OCT2020 127919 39.1N 119.6W 2.5-4.3 AAAAA California/Nevada area

NEIC reported this earthquake of M 2.6 in western Nevada was felt with intensity II-III in the area(s) of western Nevada at Carson City and Dayton.

O: 15OCT2020 15:19:18 40.1N 123.8W Md=2.1 EMSC NORTHERN CALIFORNIA

O: 15OCT2020 12:45:33 40.9N 123.8W Md=2.2 EMSC NORTHERN CALIFORNIA

ALASKA

O: 15OCT2020 11:40:35 56.1N 149.8W ml=3.1 EMSC GULF OF ALASKA

O: 15OCT2020 09:56:09 56.3N 148.9W ml=3.5 EMSC GULF OF ALASKA

O: 15OCT2020 14:53:46 56.0N 149.8W ml=3.4 EMSC GULF OF ALASKA

P: 17OCT2020 128032 56.0N 149.0W 3.0-4.5 AAAAA Northern Alaska

O: 16OCT2020 02:34:53 61.0N 151.4W ML=3.3 EMSC KENAI PENINSULA, ALASKA

P: 18OCT2020 128026 60.9N 151.1W 3.2-5.0 AAAAA Central Alaska

O: 15OCT2020 16:05:15 61.2N 149.3W Mw=4.2 EMSC SOUTHERN ALASKA

P: 16OCT2020 128028 62.7N 149.3W 3.2-4.9 ABAAA Central Alaska

O: 16OCT2020 06:01:29 65.3N 163.0W ML=3.0 EMSC NORTHERN ALASKA

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

O: 15OCT2020 01:11:01 62.7N 125.4W MB=3.6 ECAN Wrigley, NT

P: 10OCT2020 127772 62.1N 124.2W 2.5-3.9 BAAAA Northwest Terr., Canada

ROCKY MOUNTAINS REGION

O: 16OCT2020 05:43:07 31.7N 104.1W mb=2.6 EMSC WESTERN TEXAS

P: 16OCT2020 127946 32.6N 104.6W 2.0-3.8 AAAAA SW U.S.A

O: 15OCT2020 19:20:18 39.7N 110.7W ML=2.5 EMSC UTAH

O: 15OCT2020 13:53:40 38.2N 112.3W Ml=2.2 EMSC UTAH

P: 13OCT2020 127962 37.0N 112.8W 2.0-3.8 ABAAA Utah area

P: 21OCT2020 127962 38.6N 112.7W 2.0-3.9 CAAAA Utah area

O: 15OCT2020 16:21:08 44.3N 115.0W Ml=2.2 EMSC SOUTHERN IDAHO

O: 15OCT2020 22:29:08 44.3N 115.1W ML=2.7 EMSC SOUTHERN IDAHO

P: 14OCT2020 127978 44.5N 115.2W 2.0-3.9 AAAAA Montana/Idaho

EASTERN U.S./CANADA

O: 15OCT2020 07:51:00 33.7N 88.0W Md=2.5 EMSC ALABAMA

P: 9OCT2020 127707 33.0N 87.0W 2.0-3.9 CAAAA Southeast U.S.

O: 16OCT2020 01:17:55 35.1N 96.3W ML=2.1 EMSC OKLAHOMA

P: 14OCT2020 127956 35.0N 96.0W 2.0-3.8 AAAAA Southern Plains

O: 15OCT2020 18:14:53 36.5N 97.2W ML=2.2 EMSC OKLAHOMA

P: 17OCT2020 127957 37.0N 98.0W 2.0-3.8 AAAAA Southern Plains

O: 16OCT2020 02:42:26 39.0N 99.6W mb=2.5 EMSC KANSAS

P: 7OCT2020 127709 39.0N 99.0W 2.0-3.8 CAAAA Southern Plains

O: 14OCT2020 14:01:29 71.4N 79.2W MB=2.5 ECAN Pond Inlet, NU

P: 9OCT2020 127777 71.0N 75.0W 2.5-3.8 BAAAA Baffin/Davis Strait Canada

O: 14OCT2020 13:48:53 49.6N 82.4W MB=3.6 ECAN Kapuskasing, ON. Felt

P: 7OCT2020 127737 46.0N 81.0W 2.0-3.9 CCAAA Ohio/Lake Erie

HAWAII

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

QUIET SEISMIC CONDITIONS CONTINUE

EARTHQUAKE SUMMARY FOR OCTOBER 14, 2020

Global seismicity remained at quiet conditions today with the largest earthquake

recorded an M 5.0 in Central Chile. GUC reported this earthquake was felt with intensity III in Coquimbo at La Serena and Paiguano and II in Rio Hurtado, Chile. NEIC reported this earthquake of M 4.9 in San Juan, Argentina was felt with intensity II-III in the area(s) of San Juan, Argentina at San Juan, Mendoza, Rio Tercero and Buenos Aires and in Santiago, Chile. The M 4.5 was reported felt with intensity V in San Juan, Argentina. The last event of M>=5 within about 150 km of this epicenter was an M 5.1 on December 9, 2019. The last of larger magnitude was an M 5.6 on May 20, 2019. Forecast 128073 had expected today's event within about 100 km of this epicenter was likely around October 17. This epicenter is at 144 degrees from the M 6.8 in Sumatra of August 18, 2020 and was probably promoted by energy from that source.

O: 15OCT2020 02:20 31.5S 69.2W mb=5.0 GUC Coquimbo at La Serena and Paig

P: 17OCT2020 128073 31.0S 70.0W 4.0-5.4 AAAAA Central Chile

O: 14OCT2020 23:18:26 31.8S 68.1W Mw=4.5 EMSC SAN JUAN, ARGENTINA

P: 17OCT2020 128073 31.0S 70.0W 4.0-5.4 BABAA Central Chile

The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Northwest Territories of Canada. The only earthquake in the past six years within about 300 km of this epicenter with M>=4.4 was an M 4.7 on July 2, 2020. Prior to that earthquakes of M 4.4 and 4.5 occurred in March and July, 2014 in this area. The strongest earthquake in this area in the past 30 years was an M 5.6 on June 10, 1990. Forecast 127772 had expected today's event was likely within about 50 km of this epicenter was likely around October 10.

O: 14OCT2020 09:06:56 62.2N 124.4W mb=4.1 EMSC NORTHWEST TERRITORIES, CANADA

O: 14OCT2020 09:06:58 62.2N 124.6W MB=4.3 ECAN Wrigley, NT

P: 10OCT2020 127772 62.1N 124.2W 2.5-3.9 AAAAA Northwest Terr., Canada

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 14OCT2020 11:06:17 27.3N 54.5E mb=4.6 EMSC SOUTHERN IRAN

P: 15OCT2020 127912 28.0N 54.0E 3.5-4.9 AAAAA So. Iran/Persian Gulf

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

INDONESIA AND PHILIPPINES

O: 14OCT2020 20:16:27 1.0N 126.8E mb=4.7 EMSC MOLUCCA SEA

P: 20OCT2020 127847 0.0N 124.0E 4.0-5.3 CACAA Mindanao, Philippines

O: 14OCT2020 08:14:47 2.4N 128.4E ML=4.0 EMSC HALMAHERA, INDONESIA

P: 13OCT2020 127846 4.0N 127.0E 4.0-5.5 ABBAA Halmahera

O: 15OCT2020 04:59:51 4.0N 95.8E mb=4.9 EMSC OFF W COAST OF NORTHERN SUMATR

P: 17OCT2020 127849 5.0N 94.0E 4.0-5.3 AABAA Nicobar Islands

O: 15OCT2020 04:26:13 7.7S 128.0E mb=4.5 EMSC KEPULAUAN BARAT DAYA, INDONESI

P: 14OCT2020 127853 6.0S 128.0E 4.0-5.3 ABAAA Banda Sea

CENTRAL AND SOUTH AMERICA

O: 15OCT2020 02:20 31.5S 69.2W mb=5.0 GUC Coquimbo at La Serena and Paig

P: 17OCT2020 128073 31.0S 70.0W 4.0-5.4 AAAAA Central Chile

GUC reported this earthquake was felt with intensity III in Coquimbo at La Serena and Paiguano and II in Rio Hurtado, Chile.

O: 14OCT2020 20:16 33.0S 70.2W mb=4.3 GUC Santiago at Santiago, Pedro Ag

P: 14OCT2020 128073 33.0S 72.0W 4.0-5.4 AABAA Central Chile

GUC reported this earthquake was felt with intensity IV in Santiago at Santiago, Pedro Aguirre Cerda and Tiltil and II in El Monte, Chile.

O: 14OCT2020 19:19:21 6.1S 76.9W ML=4.2 EMSC NORTHERN PERU

P: 17OCT2020 127864 6.0S 79.0W 4.0-5.4 BABAA No. Peru

O: 14OCT2020 12:52:27 15.1N 98.3W ML=4.0 EMSC OFF COAST OF OAXACA, MEXICO

P: 18OCT2020 127891 15.0N 97.0W 3.5-5.1 BAAAA Oaxaca, Mexico

O: 14OCT2020 21:18:35 15.3N 94.5W ML=4.2 EMSC OFF COAST OF OAXACA, MEXICO

P: 13OCT2020 127877 14.0N 94.0W 3.5-5.0 ABAAA Chiapas, Mexico

O: 14OCT2020 10:17:05 15.6N 88.7W mb=4.1 EMSC GUATEMALA

P: 21OCT2020 127888 16.0N 88.0W 3.5-5.2 CAAAA Nicaragua

O: 14OCT2020 13:26:34 16.7N 99.5W ML=4.0 EMSC GUERRERO, MEXICO

P: 22OCT2020 127892 19.0N 99.0W 3.5-5.0 CCAAA Oaxaca, Mexico

O: 14OCT2020 07:58:45 17.9N 66.7W ML=3.1 EMSC PUERTO RICO REGION

P: 14OCT2020 127893 18.0N 66.0W 3.4-4.8 AAAAA Puerto Rico

O: 14OCT2020 19:14:21 18.7N 69.3W ML=3.3 EMSC DOMINICAN REPUBLIC

P: 13OCT2020 127900 20.0N 69.0W 3.0-4.3 ABAAA Bahamas/No. Caribbean

O: 14OCT2020 23:44:31 19.4N 70.5W ML=3.0 EMSC DOMINICAN REPUBLIC

P: 15OCT2020 127894 19.0N 71.0W 3.4-4.9 AAAAA Puerto Rico

O: 15OCT2020 02:20:10 31.5S 68.9W Mw=4.9 EMSC SAN JUAN, ARGENTINA

P: 8OCT2020 127809 31.0S 68.0W 4.0-5.4 CAAAA Central Chile

O: 14OCT2020 23:18:26 31.8S 68.1W Mw=4.5 EMSC SAN JUAN, ARGENTINA

P: 17OCT2020 128073 31.0S 70.0W 4.0-5.4 BABAA Central Chile

O: 14OCT2020 20:16:09 33.0S 70.2W ML=4.3 EMSC VALPARAISO, CHILE

P: 14OCT2020 128073 33.0S 72.0W 4.0-5.4 AABAA Central Chile

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

AFRICA AND EUROPE

O: 14OCT2020 10:58:31 35.6N 26.3E mb=4.1 EMSC CRETE, GREECE

O: 14OCT2020 22:22:49 35.6N 26.4E ML=4.1 EMSC CRETE, GREECE

P: 15OCT2020 127915 35.0N 25.0E 3.0-4.6 AAAAA Aegean Sea

P: 19OCT2020 127928 35.0N 26.0E 3.0-4.4 BAAAA Crete

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

SOUTHWEST PACIFIC

O: 15OCT2020 01:20:28 17.1S 173.8W mb=4.8 EMSC TONGA

P: 16OCT2020 128056 19.0S 173.0W 4.0-5.3 ABAAA Tonga Islands

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

OCEAN RIDGES

O: 14OCT2020 15:28:41 9.9S 66.1E mb=4.6 EMSC MID-INDIAN RIDGE

P: 17OCT2020 128050 14.0S 66.0E 4.0-5.3 BCAAA So. Indian Ocean

O: 14OCT2020 15:27:25 59.6S 24.6W mb=4.9 EMSC SOUTH SANDWICH ISLANDS REGION

P: 17OCT2020 128091 59.0S 26.0W 4.0-5.5 BAAAA So. Sandwich Islands

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

ZEALANDIA AND AUSTRALIA REGION

O: 14OCT2020 14:44:01 20.3S 147.9E ML=3.7 EMSC QUEENSLAND, AUSTRALIA

O: 14OCT2020 08:55:12 30.6S 178.8W mb=4.5 EMSC KERMADEC ISLANDS, NEW ZEALAND

P: 14OCT2020 128081 31.0S 178.0W 4.0-5.3 AAAAA So. Kermadec Islands

O: 15OCT2020 01:23:57 33.4S 178.6E ML=4.0 EMSC SOUTH OF KERMADEC ISLANDS

P: 17OCT2020 128077 33.0S 178.0E 4.0-5.3 AAAAA No. Kermadec Islands

O: 14OCT2020 19:07:28 39.6S 174.9E ML=3.6 EMSC NORTH ISLAND OF NEW ZEALAND

P: 15OCT2020 128079 39.0S 175.0E 3.0-4.3 AAAAA North Island, N.Z.

O: 14OCT2020 23:06:01 46.8S 165.7E ML=3.6 EMSC OFF W. COAST OF S. ISLAND, N.Z

P: 13OCT2020 128087 46.0S 167.0E 3.0-4.9 AAAAA Southern S. Isl. N.Z.

JAPAN AND KURIL ISLANDS

O: 14OCT2020 10:42:36 37.4N 141.7E mb=4.4 EMSC NEAR EAST COAST OF HONSHU, JAP

P: 16OCT2020 127942 36.0N 142.0E 4.0-5.3 ABAAA Off East Coast Honshu

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 14OCT2020 13:08:28 31.4N 115.4W Ml=2.7 EMSC BAJA CALIFORNIA, MEXICO

O: 14OCT2020 14:03:24 31.5N 115.3W ML=3.0 EMSC BAJA CALIFORNIA, MEXICO

P: 16OCT2020 127949 32.4N 115.8W 2.5-4.3 AAAAA So. California

P: 19OCT2020 127948 31.9N 116.3W 2.5-4.3 BAAAA So. California

O: 15OCT2020 04:48:00 33.1N 116.1W Ml=2.0 EMSC SOUTHERN CALIFORNIA

O: 14OCT2020 12:38:22 33.5N 116.5W Ml=2.4 EMSC SOUTHERN CALIFORNIA

P: 14OCT2020 127948 33.0N 116.3W 2.5-4.3 AAAAA So. California

O: 14OCT2020 21:11:50 35.7N 117.6W Ml=2.6 EMSC SOUTHERN CALIFORNIA

O: 14OCT2020 23:31:08 35.9N 117.7W Ml=2.2 EMSC CENTRAL CALIFORNIA

P: 15OCT2020 127917 36.0N 117.9W 2.5-4.3 AAAAA California/Nevada area

NEIC reported this earthquake of M 2.6 in Ridgecrest, California was felt with intensity II-III in the area(s) of Ridgecrest, California.

O: 14OCT2020 21:42:40 36.0N 121.6W ML=3.2 EMSC OFFSHORE CENTRAL CALIFORNIA

O: 14OCT2020 21:43:55 36.0N 121.5W Md=3.0 EMSC CENTRAL CALIFORNIA

O: 14OCT2020 22:30:43 36.0N 121.5W Md=2.3 EMSC CENTRAL CALIFORNIA

O: 14OCT2020 21:40:06 36.0N 121.6W ML=2.7 EMSC OFFSHORE CENTRAL CALIFORNIA

P: 15OCT2020 127921 36.4N 121.0W 2.5-4.3 AAAAA Central California

P: 17OCT2020 127943 35.6N 121.3W 2.5-4.3 BAAAA Off So. California

NEIC reported these earthquakes of M 3.0, 3.0 and 3.5 in Central California was felt with intensity II-III in the area(s) of Central California at King City.

O: 14OCT2020 18:37:56 36.4N 118.0W Ml=2.9 EMSC CENTRAL CALIFORNIA

P: 15OCT2020 127917 36.0N 117.9W 2.5-4.3 AAAAA California/Nevada area

O: 14OCT2020 12:18:04 36.4N 120.5W ML=2.5 EMSC CENTRAL CALIFORNIA

P: 15OCT2020 127921 36.4N 121.0W 2.5-4.3 AAAAA Central California

P: 17OCT2020 127943 35.6N 121.3W 2.5-4.3 BAAAA Off So. California

NEIC reported this earthquake of M 2.8 in Coalinga, California was felt with intensity II-III in the area(s) of Coalinga, California.

O: 14OCT2020 20:54:25 36.5N 121.1W Md=2.3 EMSC CENTRAL CALIFORNIA

O: 14OCT2020 23:27:32 36.9N 121.5W Md=2.8 EMSC NORTHERN CALIFORNIA

P: 17OCT2020 127922 37.1N 121.5W 2.5-4.3 BAAAA 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 Watsonville.

O: 15OCT2020 00:24:00 38.2N 117.9W ml=2.7 EMSC NEVADA

O: 14OCT2020 11:11:41 38.2N 117.9W ml=2.3 EMSC NEVADA

P: 13OCT2020 127918 37.9N 118.2W 2.5-4.4 AAAAA California/Nevada area

O: 15OCT2020 00:25:55 41.0N 124.1W MD=2.6 EMSC NORTHERN CALIFORNIA

O: 15OCT2020 03:47:11 40.3N 124.4W Md=2.2 EMSC OFFSHORE NORTHERN CALIFORNIA

P: 16OCT2020 127989 40.2N 124.2W 2.5-4.3 AAAAA Off Coast of No. Calif

NEIC reported this earthquake of M 2.6 in Northern California was felt with intensity II-III in the area(s) of Northern California at McKinleyville, Arcata and Eureka.

ALASKA

O: 14OCT2020 16:33:57 53.2N 163.5W mb=4.0 EMSC UNIMAK ISLAND REGION, ALASKA

P: 15OCT2020 128022 54.5N 161.8W 3.5-4.8 ABAAA Unimak Islands, Aleutians

O: 14OCT2020 15:04:14 55.5N 158.3W ML=3.1 EMSC ALASKA PENINSULA

P: 14OCT2020 128007 54.8N 159.7W 3.5-4.8 AAAAA Alaska Peninsula

P: 17OCT2020 128007 54.8N 158.7W 3.5-4.8 BAAAA Alaska Peninsula

O: 15OCT2020 04:43:25 60.1N 152.1W ML=3.3 EMSC SOUTHERN ALASKA

P: 16OCT2020 128025 60.3N 153.0W 3.2-4.8 AAAAA Central Alaska

O: 14OCT2020 14:42:18 66.2N 157.3W ml=3.0 EMSC NORTHERN ALASKA

O: 14OCT2020 19:50:12 66.2N 164.0W ml=3.5 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: 15OCT2020 04:29:31 31.7N 104.1W ML=3.0 EMSC WESTERN TEXAS

P: 13OCT2020 127946 31.5N 103.6W 2.0-3.8 AAAAA SW U.S.A

O: 15OCT2020 00:36:45 39.7N 110.7W ML=3.3 EMSC UTAH

P: 17OCT2020 127927 39.2N 108.4W 2.0-3.9 AABAA Colorado area

NEIC reported this earthquake of M 3.3 in Utah was felt with intensity II-III in the area(s) of Utah at Salt Lake City and Bountiful.

O: 14OCT2020 13:06:17 44.4N 115.2W Ml=2.2 EMSC SOUTHERN IDAHO

P: 14OCT2020 127978 44.5N 115.2W 2.0-3.9 AAAAA Montana/Idaho

EASTERN U.S./CANADA

O: 14OCT2020 23:08:55 35.2N 96.1W ML=2.4 EMSC OKLAHOMA

P: 14OCT2020 127956 35.0N 96.0W 2.0-3.8 AAAAA Southern Plains

O: 14OCT2020 13:48:53 49.6N 82.4W MB=3.6 ECAN Kapuskasing, ON. Felt

O: 14OCT2020 13:48:53 49.6N 82.4W ML=3.6 EMSC ONTARIO, CANADA

P: 7OCT2020 127737 46.0N 81.0W 2.0-3.9 CCAAA Ohio/Lake Erie

HAWAII

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

MODERATE QUAKE IN SOCOTRA REGION

EARTHQUAKE SUMMARY FOR OCTOBER 13, 2020

The strongest earthquake in the world today was an M 5.4 in the Socotra Region south of Iran. It was followed by an M 4.5 aftershock. It was not reported felt in this remote area. The last earthquake of M>=5.4 within about 300 km of this epicenter was an M 5.4 on March 3, 2008. An M 6.0 hit about 350 km south of this epicenter on July 19, 2014, the strongest regional event since 1996. Forecast 127875 had expected today's event within about 150 km of this epicenter was likely around October 16. This epicenter at 56 East longitude is directly south of the M 5.0 in the Caspian Sea yesterday at 52 East longitude, the largest in that region since 2015. Today's earthquake may have been promoted by tidal effects associated with the upcoming new moon as it occurred near the longitude of maximum stress with that event as noted in the previous issue of this summary:

Today's epicenter is at 104 degrees from the M 7.7 in the Alaska Peninsula

quake of July 22 and was probably promoted by concentrated energy from that event.

O: 13OCT2020 09:29:52 13.9N 56.9E mb=5.4 EMSC SOCOTRA REGION

O: 13OCT2020 09:03:01 14.0N 56.9E mb=4.5 EMSC SOCOTRA REGION

P: 16OCT2020 127875 15.0N 56.0E 3.5-4.8 BAAAA Arabian Sea

O: 14OCT2020 09:07:00 62.3N 124.8W MB=4.4 ECAN OF WRIGLEY, NT

P: 10OCT2020 127772 62.1N 124.2W 2.5-3.9 BAAAA Northwest Terr., Canada

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

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

INDONESIA AND PHILIPPINES

O: 14OCT2020 01:11:01 5.1S 134.0E ML=4.7 EMSC KEPULAUAN ARU REGION, INDONESI

P: 14OCT2020 127872 4.0S 134.0E 4.0-5.4 ABAAA West Irian, PNG

O: 14OCT2020 03:43:30 6.5N 125.9E mb=4.2 EMSC MINDANAO, PHILIPPINES

P: 11OCT2020 127599 7.0N 126.0E 4.0-5.3 BAAAA Central Philippines

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

CENTRAL AND SOUTH AMERICA

O: 13OCT2020 19:07 34.0S 72.2W mb=4.1 GUC O'Higgins at Navidad and Pichi

P: 14OCT2020 128073 33.0S 72.0W 4.0-5.4 AAAAA Central Chile

GUC reported this earthquake was felt with intensity III in O'Higgins at Navidad and Pichilemu, Chile.

O: 13OCT2020 17:16 26.3S 71.0W mb=5.0 GUC Atacma at Chanaral and Diego d

P: 17OCT2020 128062 28.0S 71.0W 4.0-5.5 BBAAA Coast Central Chile

GUC reported this earthquake was felt with intensity IV in Atacma at Chanaral and Diego de Almagro; III inCaldera, Copiapo and Tierra Amarilla, Chile.

O: 13OCT2020 21:09:25 8.3S 74.2W mb=4.7 EMSC CENTRAL PERU

P: 11OCT2020 127618 6.0S 79.0W 4.0-5.4 ACCAA No. Peru

NEIC reported this earthquake of M 4.7 in Central Peru was felt with intensity II-III in the area(s) of Central Peru at Pucallpa.

O: 13OCT2020 11:54:17 10.8N 63.9W mb=4.4 EMSC ISLA DE MARGARITA, VENEZUELA R

P: 14OCT2020 127898 11.0N 63.0W 3.4-4.9 AAAAA Windward Islands

NEIC reported this earthquake of M 4.4 in Northern Venezuela was felt with intensity II-III in the area(s) of Northern Venezuela at Porlamar and La Asuncion, Nueva Esparta.

O: 13OCT2020 23:34:41 13.4N 89.8W ML=4.0 EMSC OFFSHORE EL SALVADOR

P: 16OCT2020 127880 13.0N 90.0W 3.5-5.1 BAAAA Guatemala

O: 14OCT2020 06:56:18 14.0N 92.1W mb=4.5 EMSC OFFSHORE GUATEMALA

O: 14OCT2020 06:15:53 14.3N 93.2W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO

P: 19OCT2020 127877 14.0N 93.0W 3.5-5.1 BAAAA Chiapas, Mexico

NEIC reported this earthquake of M 4.3 in Guatemala was felt with intensity II-III in the area(s) of Guatemala at Puerto Barrios and in Belize at Punta Gorda, Toledo.

O: 13OCT2020 07:37:34 14.7N 93.8W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO

P: 13OCT2020 127877 14.0N 94.0W 3.5-5.0 AAAAA Chiapas, Mexico

O: 13OCT2020 09:31:11 15.3N 94.3W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO

P: 10OCT2020 127630 15.0N 95.0W 3.5-5.1 BAAAA Chiapas, Mexico

O: 14OCT2020 00:40:02 15.5N 88.9W mb=4.3 EMSC GUATEMALA

P: 16OCT2020 127880 13.0N 90.0W 3.5-5.1 ACAAA Guatemala

P: 21OCT2020 127888 16.0N 88.0W 3.5-5.2 CAAAA Nicaragua

O: 13OCT2020 10:38:16 15.5S 71.8W ML=4.0 EMSC SOUTHERN PERU

P: 16OCT2020 128044 15.0S 71.0W 4.0-5.3 BAAAA Central Peru

O: 14OCT2020 00:14:55 15.7N 96.0W ML=4.1 EMSC OFFSHORE OAXACA, MEXICO

P: 10OCT2020 127630 15.0N 95.0W 3.5-5.1 BAAAA Chiapas, Mexico

P: 18OCT2020 127891 15.0N 97.0W 3.5-5.1 BAAAA Oaxaca, Mexico

O: 13OCT2020 11:28:40 17.7N 95.3W ML=4.0 EMSC OAXACA, MEXICO

P: 14OCT2020 127891 17.0N 96.0W 3.5-5.0 AAAAA Oaxaca, Mexico

O: 13OCT2020 23:51:01 17.7N 98.6W ML=4.1 EMSC GUERRERO, MEXICO

P: 7OCT2020 127646 16.0N 98.0W 3.5-5.0 CBAAA Oaxaca, Mexico

O: 13OCT2020 12:24:12 18.0N 67.0W Md=3.0 EMSC PUERTO RICO

P: 13OCT2020 127895 19.0N 67.0W 3.4-4.8 AAAAA Puerto Rico

O: 13OCT2020 22:59:48 18.1N 64.2W ML=3.3 EMSC VIRGIN ISLANDS REGION

P: 15OCT2020 127883 18.0N 65.0W 3.0-4.9 AAAAA Leeward Islands

O: 13OCT2020 20:40:54 18.2N 67.9W Md=3.6 EMSC MONA PASSAGE, PUERTO RICO

P: 9OCT2020 127647 18.0N 67.0W 3.4-4.9 BAAAA Puerto Rico

O: 13OCT2020 20:59:46 18.2N 68.8W ML=3.1 EMSC DOMINICAN REPUBLIC REGION

P: 13OCT2020 127900 20.0N 69.0W 3.0-4.3 ABAAA Bahamas/No. Caribbean

O: 14OCT2020 05:20:08 19.6N 102.4W ML=4.2 EMSC MICHOACAN, MEXICO

P: 16OCT2020 127886 18.0N 103.0W 3.5-5.1 ABAAA Michoacan, Mexico

O: 13OCT2020 13:38:25 21.2S 68.1W mb=4.2 EMSC POTOSI, BOLIVIA

P: 15OCT2020 128059 21.0S 67.0W 4.0-5.4 AAAAA Argentina

P: 15OCT2020 128063 21.0S 69.0W 4.0-5.4 AAAAA Coast No. Chile

O: 13OCT2020 17:16:15 26.2S 71.1W Mw=4.8 EMSC OFFSHORE ATACAMA, CHILE

P: 17OCT2020 128062 28.0S 71.0W 4.0-5.5 BBAAA Coast Central Chile

O: 13OCT2020 19:07:22 34.0S 72.2W mb=4.1 EMSC OFFSHORE O'HIGGINS, CHILE

P: 14OCT2020 128073 33.0S 72.0W 4.0-5.4 AAAAA Central Chile

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

AFRICA AND EUROPE

O: 14OCT2020 01:52:13 71.5N 5.4W Mn=3.6 EMSC JAN MAYEN ISLAND REGION

P: 17OCT2020 128041 71.0N 7.0W 3.5-4.8 BAAAA Jan Mayen Isl. area

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: 13OCT2020 09:29:52 13.9N 56.9E mb=5.4 EMSC SOCOTRA REGION

O: 13OCT2020 09:03:01 14.0N 56.9E mb=4.5 EMSC SOCOTRA REGION

P: 16OCT2020 127875 15.0N 56.0E 3.5-4.8 BAAAA Arabian Sea

ZEALANDIA AND AUSTRALIA REGION

O: 14OCT2020 00:21:08 31.2S 179.1E mb=4.4 EMSC KERMADEC ISLANDS REGION

P: 17OCT2020 128077 33.0S 178.0E 4.0-5.3 BBAAA No. Kermadec Islands

O: 13OCT2020 19:56:03 36.4S 177.5E ML=3.6 EMSC OFF E. COAST OF N. ISLAND, N.Z

P: 15OCT2020 128078 35.0S 178.0E 4.0-5.3 ABAAA No. Kermadec Islands

P: 19OCT2020 128078 37.0S 178.0E 3.0-4.3 CAAAA North Island, N.Z.

JAPAN AND KURIL ISLANDS

O: 13OCT2020 13:16:02 33.5N 141.1E mb=4.8 EMSC OFF EAST COAST OF HONSHU, JAPA

P: 18OCT2020 127941 34.0N 140.0E 4.0-5.3 BAAAA Off East Coast Honshu

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 13OCT2020 12:27:54 32.9N 115.9W ML=2.6 EMSC SOUTHERN CALIFORNIA

P: 16OCT2020 127949 32.4N 115.8W 2.5-4.3 BAAAA So. California

O: 13OCT2020 15:09:55 35.8N 119.3W Ml=2.2 EMSC CENTRAL CALIFORNIA

P: 19OCT2020 127951 35.6N 118.4W 2.5-4.3 CAAAA So. California

O: 13OCT2020 22:56:02 36.2N 120.5W Md=2.1 EMSC CENTRAL CALIFORNIA

P: 14OCT2020 127922 36.6N 120.7W 2.5-4.3 AAAAA Central California

O: 14OCT2020 02:30:15 36.4N 117.9W Ml=2.2 EMSC CENTRAL CALIFORNIA

P: 15OCT2020 127917 36.0N 117.9W 2.5-4.3 AAAAA California/Nevada area

O: 13OCT2020 12:46:10 36.7N 121.3W Md=2.6 EMSC CENTRAL CALIFORNIA

P: 15OCT2020 127921 36.4N 121.0W 2.5-4.3 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 San Juan Bautista, Los Banos, San Jose and Walnut Creek.

O: 13OCT2020 12:01:24 37.3N 120.0W Md=2.7 EMSC CENTRAL CALIFORNIA

P: 14OCT2020 127922 36.6N 120.7W 2.5-4.3 AAAAA Central California

NEIC reported this earthquake of M 2.7 in Central California was felt with intensity II-III in the area(s) of Central California at Mariposa.

O: 13OCT2020 19:45:55 38.8N 122.8W Md=2.3 EMSC NORTHERN CALIFORNIA

P: 13OCT2020 127924 38.9N 122.8W 2.5-4.3 AAAAA Central California

ALASKA

O: 13OCT2020 16:40:38 51.9N 178.7W ML=3.1 EMSC ANDREANOF ISLANDS, ALEUTIAN IS

P: 15OCT2020 128008 52.3N 179.5W 3.5-4.8 AAAAA Andreanoff Isls, Aleutians

O: 14OCT2020 03:19:57 60.8N 150.6W ML=3.2 EMSC KENAI PENINSULA, ALASKA

P: 18OCT2020 128026 60.9N 151.1W 3.2-5.0 BAAAA Central Alaska

NEIC reported this earthquake of M 3.0 in Kenai Peninsula, Alaska was felt with intensity II-III in the area(s) of Kenai Peninsula, Alaska at Kenai, Anchorage.

O: 14OCT2020 02:21:51 62.3N 153.4W ML=3.1 EMSC CENTRAL ALASKA

P: 15OCT2020 128028 63.1N 151.9W 3.2-4.8 AAAAA Central Alaska

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

O: 14OCT2020 00:51:07 43.4N 127.0W ML=3.2 EMSC OFF COAST OF OREGON

P: 15OCT2020 127992 43.6N 127.5W 3.0-4.3 AAAAA Off Coast of Oregon

O: 14OCT2020 01:46:39 47.7N 122.1W Ml=2.1 EMSC SEATTLE-TACOMA AREA, WASHINGTO

P: 16OCT2020 128004 48.4N 123.2W 2.0-3.9 AAAAA Washington state, U.S.

O: 13OCT2020 07:11:03 48.0N 124.7W Ml=2.9 EMSC OFFSHORE WASHINGTON

P: 16OCT2020 128004 48.4N 123.2W 2.0-3.9 BABAA Washington state, U.S.

O: 14OCT2020 09:07:00 62.3N 124.8W MB=4.4 ECAN OF WRIGLEY, NT

P: 10OCT2020 127772 62.1N 124.2W 2.5-3.9 BAAAA Northwest Terr., Canada

ROCKY MOUNTAINS REGION

O: 13OCT2020 08:25:45 31.9N 102.3W mb=2.5 EMSC WESTERN TEXAS

P: 13OCT2020 127946 31.5N 103.6W 2.0-3.8 AAAAA SW U.S.A

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

O: 13OCT2020 16:08:41 35.2N 111.5W ML=3.3 EMSC ARIZONA

P: 11OCT2020 127699 34.7N 111.0W 2.0-4.0 AAAAA SW U.S.A

P: 18OCT2020 127947 35.7N 111.0W 2.0-4.1 BAAAA SW U.S.A

NEIC reported this earthquake of M 3.3 in Arizona was felt with intensity II-III in the area(s) of Arizona at Flagstaff, Comp Verde, Chino Valley, Prescott Valley, Winslow, Mayer, Holbrook, Scottsdale and Glendale.

O: 13OCT2020 21:05:11 37.9N 112.4W ML=2.6 EMSC UTAH

P: 13OCT2020 127962 37.0N 112.8W 2.0-3.8 AAAAA Utah area

O: 13OCT2020 15:22:11 44.3N 115.2W Ml=2.2 EMSC SOUTHERN IDAHO

O: 13OCT2020 08:49:35 44.4N 115.2W Ml=2.1 EMSC SOUTHERN IDAHO

P: 14OCT2020 127978 44.5N 115.2W 2.0-3.9 AAAAA Montana/Idaho

EASTERN U.S./CANADA

O: 13OCT2020 12:51:06 36.4N 81.2W mb=2.4 EMSC VIRGINIA-N CAROLINA BORDER REG

P: 17OCT2020 127930 37.2N 81.9W 2.0-3.8 BAAAA Kentucky/Tennessee/NC

O: 13OCT2020 08:38:39 67.8N 65.3W ML=3.2 EMSC BAFFIN ISLAND REGION, CANADA

O: 13OCT2020 08:38:39 67.8N 65.3W MB=3.2 ECAN Qikiqtarjuaq, NU

P: 9OCT2020 127777 71.0N 75.0W 2.5-3.8 BCBAA Baffin/Davis Strait Canada

HAWAII

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

STRONG TIDAL SEISMICITY POSSIBLE WITH UPCOMING NEW MOON

EARTHQUAKE SUMMARY FOR OCTOBER 12, 2020

Based on the history of large earthquakes around the world over the past four months, it is likely that a strong enhancement of seismicity will coincide with the upcoming new moon. This summary has noted this as:

The earthquakes in question follow:

MO DA HR MN SE YEAR LAT LONG DEP MAG Location

09 18 21 43 58 2020 0.8 -26.7 30 6.7 Central Mid-Atlantic Ridge

09 01 04 09 30 2020 -28.0 -71.0 30 6.8 Atacama, Chile

08 21 04 09 52 2020 -6.7 123.5 643 6.9 Banda Sea

08 18 22 29 22 2020 -4.2 101.2 10 6.8 Sumatra

07 22 06 12 44 2020 55.1 -158.6 30 7.8 Alaska Peninsula

06 23 15 29 04 2020 16.1 -95.9 10 7.4 Oaxaca, Mexico

06 18 12 49 00 2020 -33.4 -177.5 100 7.4 Kermadec Islands

Seismicity around the world continued at quiet levels again today as it approaches the likely new moon enhancement.

The strongest earthquake in the world today was an M 5.0 in the Caspian Sea off shore Turkmenistan. The last earthquake within about 200 km of this epicenter with M>=5.0 was an M 5.2 on March 22, 2015 and prior to that an M 5.5 on June 7, 2014. Forecasts 127722 and 127973 had expected today's activity between October 5 and 13 within about 100 km of today's epicenter.

O: 12OCT2020 11:47:20 39.6N 52.0E mb=5.0 EMSC CASPIAN SEA, OFFSHR TURKMENIST

P: 5OCT2020 127722 40.0N 52.0E 4.0-5.3 CAAAA Kazakhstan

P: 13OCT2020 127973 40.0N 54.0E 4.0-5.3 AABAA Kazakhstan

Active conditions also continued in the area of Chiapas, Mexico and Guatemala where an M 5.5 occurred yesterday. The strongest event in the region today was an M 4.9. In the previous issue of this summary, this activity had been addressed as:

"The strongest earthquake felt in the world today was an M 5.5 off the coast of

Chiapas, Mexico. Today's event was reported by NEIC felt in Chiapas at Cacahoatan and Tuxtla Gutierrez and in Santa Catarina Pinula, Guatemala. A similar earthquake of M 5.5 last hit the area of Chiapas, Mexico on May 24, 2020 and on April 24, 2020. The only strong earthquake in the Chiapas area in the past year was an M 6.3 about 100 km south of today's M 5.5 on November 20, 2019. Forecast 127630 had expected today's event was likely about 100 km north of the epicenter was likely around October 9. This activity is at 144 degrees from the Banda Sea earthquake of August 21, 2020 (M 6.9) and was probably promoted by energy from this source." (October 11-12, 2020)

NEIC reported this activity in Chiapas, Mexico was felt with intensity II-III in the area(s) of Guatemala at San Marcos la Laguna and Atitlan, Solola.

O: 12OCT2020 10:17:57 14.6N 93.8W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO

O: 12OCT2020 14:36:22 14.6N 93.7W ML=4.0 EMSC OFF COAST OF CHIAPAS, MEXICO

O: 12OCT2020 21:28:51 14.6N 93.8W ML=4.2 EMSC OFF COAST OF CHIAPAS, MEXICO

O: 12OCT2020 07:03:06 14.7N 93.7W Mw=4.9 EMSC OFF COAST OF CHIAPAS, MEXICO

O: 12OCT2020 21:06:43 14.8N 93.7W mb=4.2 EMSC OFFSHORE CHIAPAS, MEXICO

O: 13OCT2020 00:31:22 14.9N 93.6W mb=4.0 EMSC OFFSHORE CHIAPAS, MEXICO

O: 12OCT2020 15:25:23 15.0N 93.3W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO

O: 12OCT2020 09:22:00 15.1N 93.6W ML=4.0 EMSC OFFSHORE CHIAPAS, MEXICO

O: 12OCT2020 16:38:31 15.1N 93.1W mb=4.0 EMSC OFFSHORE CHIAPAS, MEXICO

O: 12OCT2020 21:03:11 14.5N 93.8W ML=4.1 EMSC OFF COAST OF CHIAPAS, MEXICO

O: 13OCT2020 00:12:40 15.1N 92.6W mb=4.3 EMSC CHIAPAS, MEXICO

P: 9OCT2020 127630 16.0N 93.0W 3.5-5.1 BAAAA Chiapas, Mexico

P: 13OCT2020 127877 14.0N 94.0W 3.5-5.0 AAAAA Chiapas, Mexico

A series of moderate earthquakes also occurred in the central Philippines today. These events of M 4.8 and 4.0 in Mindanao; M 4.5 in the northern Philippines and M 4.7 in Samar may have been promoted by the passage through the area of Tropical Storm Nangka. The effects of this storm on this region were expected in previous issues of this summary as:

"TD 17W (Nangka) formed today west of Samar, Indonesia with winds up to 35 kts. It is expected to track to the west over the next several days reaching Vietnam around October 11. Seismicity in southeast Asia is expected to be enhanced by this storm at landfall." (October 9-13, 2020)

NEIC reported this earthquake of M 4.8 in Mindanao, Philippines was felt with intensity II-III in the area(s) of Mindanao, Philippines at Dagami, Eastern Visayas. PHIVOLCS reported it at M 5.0 and felt with intensity IV in General Luna, Burgos and Socorro, Surigao Del Norte; San Jose, Dinagat Islands; III in Surigao City, Dapa, Surigao Del Norte and II in Carrascal and Tubod, Surigao Del Sur; Loreto, Dinagat Islands. Forecast 127884 had expected this activity in mid-October.

O: 12OCT2020 19:21:38 9.8N 126.1E mb=4.8 EMSC MINDANAO, PHILIPPINES

O: 12OCT2020 21:07:56 10.0N 126.3E ML=4.0 EMSC MINDANAO, PHILIPPINES

P: 21OCT2020 127884 12.0N 122.0E 3.5-4.8 CBCAA Luzon, Philippines

NEIC reported the earthquake of M 4.7 in Samar, Philippines was felt with intensity II-III in the area(s) of Samar, Philippines at Pawing, Eastern Visayas. PHIVOLCS reported it was felt with intensity IV in Hernani, Eastern Samar; III in Llorente, Eastern Samar and II in Catbalogan City; La Paz, Julita, Dagami, Tanauan, Dulag and Barugo, Leyte.

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

O: 13OCT2020 06:49:04 11.3N 125.6E mb=4.7 EMSC SAMAR, PHILIPPINES

P: 14OCT2020 127884 13.0N 122.0E 3.5-4.8 ABCAA Luzon, Philippines

O: 13OCT2020 04:35:58 19.9N 121.4E mb=4.5 EMSC BABUYAN ISL REGION, PHILIPPINE

P: 17OCT2020 127913 21.0N 120.0E 4.0-5.4 BBBAA Taiwan

The strongest earthquake in the U.S. or Canada today was an M 3.5-3.6 in the Alaska Peninsula. The last earthquake within about 100 km of this epicenter was an M 3.8 on September 8, 2020. Forecast 128022 had expected today's event was likely around October 15.

O: 13OCT2020 03:18:51 54.2N 162.4W ml=3.5 EMSC ALASKA PENINSULA

O: 13OCT2020 03:18:50 54.0N 162.3W ml=3.6 ANSS ALASKA PENINSULA

P: 15OCT2020 128022 54.5N 161.8W 3.5-4.8 AAAAA Unimak Islands, Aleutians

OTHER GLOBAL EARTHQUAKE ACTIVITY

ASIA

O: 13OCT2020 01:36:21 23.2N 93.9E ML=4.1 EMSC MYANMAR-INDIA BORDER REGION

P: 15OCT2020 127907 24.0N 94.0E 4.0-5.4 AAAAA Myanmar

O: 13OCT2020 02:25:28 37.1N 71.6E mb=4.4 EMSC TAJIKISTAN

P: 8OCT2020 127683 36.0N 72.0E 3.8-5.1 BBAAA Hindu Kush/Pakistan

O: 12OCT2020 15:39:43 24.5N 122.0E mb=4.3 EMSC TAIWAN REGION

P: 15OCT2020 127913 23.0N 122.0E 4.0-5.3 BBAAA Taiwan

NEIC reported this earthquake of M 4.3 in Taiwan was felt with intensity II-III in the area(s) of Taiwan in Taoyuan.

O: 12OCT2020 11:58:28 55.0N 164.3E mb=4.0 EMSC KOMANDORSKIYE OSTROVA REGION

P: 11OCT2020 127756 56.0N 166.0E 4.0-5.5 AAAAA Komandorsky Isl

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

INDONESIA AND PHILIPPINES

O: 12OCT2020 15:14:13 1.2S 134.9E ML=4.4 EMSC NEAR N COAST OF PAPUA, INDONES

P: 8OCT2020 127625 1.0S 137.0E 4.0-5.4 BABAA West Irian, PNG

P: 14OCT2020 127872 4.0S 134.0E 4.0-5.4 ACAAA West Irian, PNG

BMG reported this earthquake of M 4.5 in New Guinea was felt with intensity II-III in the area(s) of New Guinea at Tembagapura, PNG.

O: 12OCT2020 18:41:57 4.8S 152.2E mb=4.9 EMSC NEW BRITAIN REGION, P.N.G.

P: 16OCT2020 127860 6.0S 152.0E 4.0-5.3 BBAAA New Britain

O: 12OCT2020 19:04:47 6.6S 129.4E ML=4.4 EMSC BANDA SEA

P: 11OCT2020 127626 7.0S 130.0E 4.0-5.3 AAAAA West Irian, PNG

O: 12OCT2020 17:12:43 9.1S 107.2E ML=4.1 EMSC SOUTH OF JAVA, INDONESIA

P: 7OCT2020 127621 9.0S 106.0E 4.0-5.3 BAAAA So. of Java

O: 12OCT2020 19:21:38 9.8N 126.1E mb=4.8 EMSC MINDANAO, PHILIPPINES

O: 12OCT2020 21:07:56 10.0N 126.3E ML=4.0 EMSC MINDANAO, PHILIPPINES

P: 21OCT2020 127884 12.0N 122.0E 3.5-4.8 CBCAA Luzon, Philippines

O: 13OCT2020 06:49:04 11.3N 125.6E mb=4.7 EMSC SAMAR, PHILIPPINES

P: 14OCT2020 127884 13.0N 122.0E 3.5-4.8 ABCAA Luzon, Philippines

O: 13OCT2020 04:35:58 19.9N 121.4E mb=4.5 EMSC BABUYAN ISL REGION, PHILIPPINE

P: 17OCT2020 127913 21.0N 120.0E 4.0-5.4 BBBAA Taiwan

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

CENTRAL AND SOUTH AMERICA

O: 12OCT2020 23:09:29 2.2S 77.3W mb=4.5 EMSC PERU-ECUADOR BORDER REGION

P: 9OCT2020 127611 1.0S 81.0W 4.0-5.3 BBCAA Ecuador

NEIC reported this earthquake of M 4.5 in Peru-Ecuador was felt with intensity II-III in the area(s) of Peru-Ecuador at Tena Napo.