Weekly Seismicity Report For December 28, 2020 to January 3, 2021

During the week of December 28, 2020, the Alaska Earthquake Center reported 836 earthquakes within the state. The largest earthquake was magnitude 6.1 that occurred on January 3 at 03:38:49 AKST (January 3, 12:38:49 UTC), 51 miles E of Amchitka. Most earthquakes greater than magnitude 3.5 were located along the Aleutian Islands, except a magnitude 4.3 in the Gulf of Alaska and a magnitude 3.6 near Valdez. Simeonof aftershocks were ongoing, contributing a bit under 200 earthquakes to our catalogue. 5 events were reported as felt this week. 

Notable Events in Descending Order of Magnitude

Magnitude 6.1, 51 miles E of Amchitka, January 3 03:38:49 AKST
Magnitude 4.9, 7 miles N of Larsen Bay, January 2 23:45:03 AKST
Magnitude 4.5, 63 miles SE of Sand Point, December 29 18:22:18 AKST
Magnitude 4.3, 162 miles SE of Old Harbor, December 29 00:41:41 AKST
Magnitude 3.8, 32 miles SE of Nikolski, December 28 09:15:49 AKST
Magnitude 3.7, 66 miles SE of Sand Point, December 30 05:04:00 AKST
Magnitude 3.7, 14 miles E of Little Sitkin Pass, December 30 19:10:10 AKST
Magnitude 3.7, 90 miles SE of Westdahl Peak, December 27 18:10:01 AKST
Magnitude 3.6, 6 miles N of Valdez, December 30 18:55:45 AKST
Magnitude 3.6, 36 miles S of Perryville, December 31 14:32:34 AKST

This report was compiled by S. Cotton.

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.