Monthly Seismicity Report For October 1, 2020 to October 31, 2020

During the month of October 2020, the Alaska Earthquake Center reported 5565 earthquakes within the state. The largest earthquake was magnitude 7.6 Simeonof aftershock that occurred on October 19 at 12:54:39 AKST (October 19, 20:54:39 UTC), 65 miles SE of Sand Point, followed by about 2000 its own aftershocks of magnitude 2.0-5.9. There were also about 100 events located at Purcell Mountains, about 50 events in Kaktovik,  and 17 earthquakes offshore Kodiak. We continued recording events related to glacial activity at Prince William Sound, Icy Bay and Yakutat Bay.  At least three earthquakes were reported as felt in October.

Notable Events in Descending Order of Magnitude

Magnitude 7.6, 65 miles SE of Sand Point, October 19 11:54:40 AKST
Magnitude 5.9, 41 miles SE of Sand Point, October 5 20:54:51 AKST
Magnitude 5.9, 90 miles SE of Sand Point, October 19 12:45:24 AKST
Magnitude 5.7, 35 miles SE of Nikolski, October 8 05:22:38 AKST
Magnitude 5.7, 80 miles SE of Sand Point, October 19 12:05:57 AKST
Magnitude 5.7, 65 miles SE of Sand Point, October 19 12:06:20 AKST
Magnitude 5.7, 57 miles SE of Sand Point, October 19 12:06:22 AKST
Magnitude 5.6, 86 miles SE of Sand Point, October 19 19:07:09 AKST
Magnitude 5.5, 82 miles SE of Sand Point, October 19 12:32:21 AKST
Magnitude 5.4, 87 miles SE of Sand Point, October 19 19:06:50 AKST

This report was compiled by N.Kozyreva

The data in this report are preliminary and subject to revision. The earthquake parameters have been determined by the AEC, with supplemental data provided by the USGS National Earthquake Information Center. The data are released on the condition that none of the cooperating agencies may be held liable for any damaged resulting from its authroized or unauthorized use.

For more information on earthquakes and seismology, contact the AEC at (907)-474-7320.