Weekly Seismicity Report For April 5, 2021 to April 11, 2021

During the week of April 5, 2021, the Alaska Earthquake Center reported 791 earthquakes within the state. The largest earthquake was magnitude 5.5 that occurred on April 8 at 09:10:18 AKST (April 8, 17:10:18 UTC), 17 miles SE of Cantwell. All other earthquakes greater than 3.5 were located along the Aleutians. Activity is ongoing in the Simeonof and offshore Kodiak aftershock areas, and the Purcell Mountain area. Three earthquakes were reported as felt this week. 

Notable Events in Descending Order of Magnitude

Magnitude 5.5, 17 miles SE of Cantwell, April 8 09:10:19 AKST
Magnitude 4.7, 38 miles S of Nikolski, April 7 11:31:55 AKST
Magnitude 4.3, 36 miles SE of Adak, April 6 01:02:26 AKST
Magnitude 4.1, 76 miles SE of Sand Point, April 10 23:10:50 AKST
Magnitude 3.7, 29 miles SE of Mt. Cleveland, April 7 18:49:50 AKST
Magnitude 3.6, 52 miles N of Atka, April 6 21:19:45 AKST
Magnitude 3.5, 37 miles W of Seguam Island, April 8 07:02:49 AKST
Magnitude 3.4, 36 miles W of Seguam Island, April 7 14:21:22 AKST
Magnitude 3.3, 65 miles SE of Sand Point, April 9 15:19:43 AKST
Magnitude 3.3, 175 miles SE of Kodiak, April 10 06:08:34 AKST

This report was compiled by R. Ranft

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 damage resulting from its authorized or unauthorized use.

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