During the week of September 18, 2023, the Alaska Earthquake Center reported 933 earthquakes within the state. The largest earthquake was magnitude 5.5 that occurred on September 20 at 17:13:58 AKDT (September 21, 01:13:58 UTC), 31 miles S of Sand Point. There were 13 aftershocks associated with this earthquake ranging from magnitude 1.5 to 5.

Other significant events include a magnitude 3.9 earthquake that occurred  0 miles SE of Salcha and 7 miles southwest of Pump Station 08 on September 23, 2023 03:12:51 AKDT, this event was reported at felt in Eielson AFB, North Pole and Fairbanks, a magnitude 3.4 earthquake that occurred 17 miles NE of Iliamna Volcano on September 17, 2023 22:09:43 AKDT, this event was reported as felt in the Kenai Peninsula, a magnitude 3.3 earthquake that occurred 14 miles W of Willow on September 19, 2023 05:58:06 AKDT, this event was reported as felt in Willow, Talkeetna, and Anchorage.

There were 20 icequakes recorded near Prince William Sound region, Icy Bay, Yakutat Bay and northeast of Juneau.

3 events were reported as felt.






Magnitude 5.5, 31 miles S of Sand Point, September 20 17:13:59 AKDT
Magnitude 5.0, 31 miles S of Sand Point, September 22 01:04:41 AKDT
Magnitude 5.0, 15 miles E of Amukta Pass, September 24 07:01:39 AKDT
Magnitude 4.4, 70 miles S of Sand Point, September 19 08:52:58 AKDT
Magnitude 3.9, 27 miles S of Atka, September 17 23:03:14 AKDT
Magnitude 3.9, 18 miles E of Amchitka, September 24 10:20:15 AKDT
Magnitude 3.9, 27 miles SW of Mt. Gareloi, September 22 12:06:30 AKDT
Magnitude 3.9, 0 miles SE of Salcha, September 23 03:12:51 AKDT
Magnitude 3.8, 10 miles SE of Little Sitkin Pass, September 20 05:50:02 AKDT
Magnitude 3.7, 125 miles SE of Chignik, September 21 22:34:24 AKDT

This report was compiled by Shah Khan

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.