During the month of May 2023, the Alaska Earthquake Center reported 3827 earthquakes within the state with magnitudes ranging between 0.3 and 5.02 and depths between 0 and 144 miles. The largest earthquake was magnitude 5.4 that occurred on May 13 at 12:19:50 AKDT (May 13, 20:19:50 UTC), 6 miles E of Uliaga Island in the depth of 65 miles.

The most notable seismic event in May was a magnitude 4.6 earthquake that occurred on May 13th at 7:53PM AKDT 43 miles West of Anchorage in the Cook Inlet. It was widely felt in the South of Alaska and Kenai Peninsula. 300 DYFI reports were submitted.

Other than that we reported 40 suspected quarry blasts (M0.3-2.0), 72 ice quakes (M0.8-1.7), and 208 seismic events associated with volcanic activity (M0.6-3.9). The seismic activity at volcanoes in May  was lower than it was in April and March 2023.

We continue to monitor our "hot spots"  within Anchorage, offshore Kodiak, Simeonof-Chignik, Kaktovik aftershock zones as well as crustal seismic activity in the Brooks Range, Seward Peninsula and Bering Strait. 

Thirteen earthquakes were reported as felt in May.


Magnitude 5.4, 6 miles E of Uliaga Island, May 13 12:19:50 AKDT
Magnitude 4.9, 31 miles S of Makushin Volcano, May 9 06:10:47 AKDT
Magnitude 4.6, 88 miles SE of Westdahl Peak, May 4 23:34:16 AKDT
Magnitude 4.6, 1 miles S of Tyonek, May 12 19:53:57 AKDT
Magnitude 4.6, 25 miles N of Great Sitkin Island, May 18 05:13:21 AKDT
Magnitude 4.6, 26 miles SE of Adak, May 18 13:08:22 AKDT
Magnitude 4.4, 16 miles SW of Redoubt Volcano, May 27 08:49:23 AKDT
Magnitude 4.4, 24 miles W of Denali Park, May 8 19:40:56 AKDT
Magnitude 4.4, 12 miles SE of Little Sitkin Pass, May 21 19:11:54 AKDT
Magnitude 4.3, 77 miles N of Atka, May 16 09:11:28 AKDT

This report was compiled by N Kozyreva.

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.