Weekly Seismicity Report For September 7, 2020 to September 13, 2020

During the week of September 7, 2020, the Alaska Earthquake Center reported 884 earthquakes within the state. The largest earthquake was magnitude 4.7 that occurred on September 10 at 20:44:35 AKST (September 11, 04:44:35 UTC), 160 miles S of Shemya Island. 9 events were felt this week, most of which were aftershocks from the 2018 M7.1 Anchorage earthquake. The Purcell Mountain swarm was less active with 13 events and we are continuing to see our usual Fall increase in glacial calving events.

Notable Events in Descending Order of Magnitude

Magnitude 4.7, 160 miles S of Shemya Is, September 10 20:44:36 AKST
Magnitude 4.3, 9 miles E of Hayes Volcano, September 11 05:58:33 AKST
Magnitude 4.1, 26 miles N of Valdez, September 13 07:10:10 AKST
Magnitude 4.0, 15 miles N of Elmendorf AFB, September 9 18:18:00 AKST
Magnitude 3.6, 40 miles S of King Cove, September 8 15:36:07 AKST
Magnitude 3.6, 41 miles E of Sand Point, September 6 18:49:23 AKST
Magnitude 3.6, 40 miles SE of Buldir Is, September 8 05:43:35 AKST
Magnitude 3.5, 68 miles SE of Perryville, September 7 12:08:47 AKST
Magnitude 3.3, 61 miles S of Sand Point, September 13 11:53:56 AKST
Magnitude 3.3, 154 miles SE of Old Harbor, September 13 03:11:54 AKST

This report was compiled by M. Braun.

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.