Weekly Seismicity Report For August 23, 2021 to August 29, 2021

During the week of August 23, 2021, the Alaska Earthquake Center reported 982 earthquakes within the state. The largest earthquake was magnitude 4.5 that occurred on August 24 at 17:31:26 AKST (August 25, 01:31:26 UTC), 40 miles SE of Perryville.All other events larger than magnitude 3.5 occurred along the subduction zone and in the Chukchi Sea. There is continued activity in the Chignik, Simeonoff and offshore Kodiak aftershock zones with a decrease in activity near the Purcell Mountains. Glacial icequakes were recorded in Icy Bay and Prince William Sound. Three events were reported as felt. 

Notable Events in Descending Order of Magnitude

Magnitude 4.5, 40 miles SE of Perryville, August 24 17:31:27 AKST
Magnitude 4.3, 29 miles SE of Mt. Recheshnoi, August 29 00:30:16 AKST
Magnitude 4.2, 9 miles SW of Davidof Island, August 25 02:15:42 AKST
Magnitude 4.1, 107 miles N of Little Diomede, August 25 20:49:56 AKST
Magnitude 4.0, 37 miles SE of Nikolski, August 24 11:49:34 AKST
Magnitude 3.8, 106 miles N of Little Diomede, August 26 02:19:29 AKST
Magnitude 3.7, 165 miles SE of Kodiak, August 23 11:28:55 AKST
Magnitude 3.6, 10 miles SW of Anchor Point, August 27 08:19:10 AKST
Magnitude 3.5, 76 miles S of Perryville, August 27 01:39:58 AKST
Magnitude 3.5, 94 miles SE of Perryville, August 28 12:21:48 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.