Weekly Seismicity Report For September 13, 2021 to September 19, 2021

During the week of September 13, 2021, the Alaska Earthquake Center reported 1006 earthquakes within the state. The largest earthquake was magnitude 5.6 that occurred on September 16 at 09:51:55 AKST (September 16, 17:51:55 UTC), 112 miles SE of Chignik. Most other events larger than magnitude 3.5 occurred along the Aleutians. Other notable events was a magnitude 4.9 near Salcha and a magnitude 3.8 near the Chukchi Sea. We located roughly 100 aftershocks of the Salcha earthquake. Aftershocks also continued in the Simeonof, Chignik and Yakutat zones. Glacial ice-quakes continue in the Prince William Sound and Icy Bay. 4 events were reported as felt. 

Notable Events in Descending Order of Magnitude

Magnitude 5.6, 112 miles SE of Chignik, September 16 09:51:56 AKST
Magnitude 5.1, 124 miles SE of Chignik, September 16 15:05:08 AKST
Magnitude 5.0, 8 miles SE of Salcha, September 13 21:56:37 AKST
Magnitude 4.9, 7 miles S of Pump Station #8, September 13 21:56:37 AKST
Magnitude 4.0, 104 miles S of Adak, September 15 05:27:54 AKST
Magnitude 3.9, 122 miles SE of Chignik, September 15 02:48:57 AKST
Magnitude 3.8, 99 miles N of Little Diomede, September 16 07:57:50 AKST
Magnitude 3.6, 8 miles NW of Glennallen, September 14 13:51:22 AKST
Magnitude 3.5, 9 miles NW of Glennallen, September 14 13:51:22 AKST
Magnitude 3.5, 84 miles S of Perryville, September 19 05:17:46 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.