During the week of October 23, 2023, the Alaska Earthquake Center reported 1025 earthquakes within the state. The largest earthquake was magnitude 5.3 that occurred on October 27 at 19:44:10 AKST (October 28, 03:44:10 UTC), 36 miles SW of Klukwan.

A magnitude 5.1 earthquake that occurred 33 miles SW of Klukwan on October 27, 2023 19:01:49 AKDT, that was about 40 minutes before the main shock as above. These events were reported as felt widely in Juneau and surrounding areas. There were over 100 aftershocks recorded for the event.

Other significant events include a magnitude 4.0 that occurred 26 miles E of Kantishna on October 27, 2023 17:00:04 AKDT, and a magnitude 3.7 that occurred 79 miles E of Chalkyitsik on October 22, 2023 17:49:00 AKDT. In addition, we recorded high activity NW of Unalaska with over 50 earthquakes ranging in magnitude between 1.4 and 2.8 in this week.

There were 83 icequakes recorded near E of Wrangell-St. Elias National park and Preserve, the Prince William Sound region, Bering Glacier, Icy Bay and Yakutat Bay. 

7 events were reported as felt.


Magnitude 5.3, 36 miles SW of Klukwan, October 27 19:44:11 AKDT
Magnitude 5.1, 33 miles SW of Klukwan, October 27 19:01:49 AKDT
Magnitude 4.1, 43 miles SW of Seguam Island, October 29 00:48:07 AKDT
Magnitude 4.0, 26 miles E of Kantishna, October 27 17:00:04 AKDT
Magnitude 3.9, 40 miles SE of Mt. Cleveland, October 25 05:35:45 AKDT
Magnitude 3.9, 29 miles S of Bobrof Island, October 28 00:38:54 AKDT
Magnitude 3.7, 45 miles SW of Buldir Is, October 23 13:10:12 AKDT
Magnitude 3.7, 13 miles N of Kasatochi Island, October 24 01:32:04 AKDT
Magnitude 3.7, 79 miles E of Chalkyitsik, October 22 17:49:01 AKDT
Magnitude 3.5, 35 miles SW of Klukwan, October 27 21:11:57 AKDT

This report was compiled by Ayumi Bakken

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 authorized or unauthorized use.

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