Weekly Seismicity Report For March 15, 2021 to March 21, 2021

During the week of March 15, 2021, the Alaska Earthquake Center reported 989 earthquakes within the state. The largest earthquake was magnitude 4.5 that occurred on March 17 at 10:00:35 AKST (March 17, 18:00:35 UTC), 32 miles S of Atka. All events greater than magnitude 3.5 occured along the subduction zone. We also located a M3.8 Kodiak offshore aftershock, a M3.3 event in Denali, and a M3.3 earthquake 62 miles W of Elfin Cove. Glacier calving events were recorded in Prince William Sound area. One event was felt this week.

Notable Events in Descending Order of Magnitude

Magnitude 4.5, 32 miles S of Atka, March 17 10:00:36 AKST
Magnitude 4.3, 27 miles S of Sand Point, March 18 14:50:25 AKST
Magnitude 4.0, 16 miles S of Atka, March 14 21:13:31 AKST
Magnitude 3.8, 181 miles SE of Kodiak, March 20 02:24:45 AKST
Magnitude 3.8, 165 miles W of Little Diomede, March 15 05:56:23 AKST
Magnitude 3.6, 16 miles NE of Little Sitkin Pass, March 18 01:56:20 AKST
Magnitude 3.5, 24 miles NW of Seguam Island, March 15 12:04:45 AKST
Magnitude 3.3, 181 miles SE of Kodiak, March 20 02:28:22 AKST
Magnitude 3.3, 5 miles N of Cantwell, March 20 07:15:16 AKST
Magnitude 3.3, 62 miles W of Elfin Cove, March 17 02:35:24 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.