Monthly Seismicity Report For February 1, 2021 to February 28, 2021

During the month of February 2021, the Alaska Earthquake Center reported 3459 earthquakes within the state. The largest earthquake was magnitude 5.4 that occurred on February 28 at 01:44:50 AKST (February 28, 10:44:50 UTC), 51 miles S of Mt. Gareloi. There were 14 earthquakes with magnitudes greater than 4, all of which occurred along the Aleutian subduction zone. Five earthquakes M4.3-M5.4 were recorded near Mt. Gareloi. 13 earthquakes were reported as felt this month. The most widely felt earthquake was a M5.3 aftershock of the 2018 M7.1 Anchorage earthquake. We also located nearly 400 Simeonof aftershocks, and saw continued activity in the Purcell Mountain, Kaktovik, and offshore Kodiak areas.

Notable Events in Descending Order of Magnitude

Magnitude 5.4, 51 miles S of Mt. Gareloi, February 28 02:44:50 AKST
Magnitude 5.3, 35 miles NW of Akhiok, February 13 05:08:55 AKST
Magnitude 5.3, 7 miles NW of Elmendorf AFB, February 27 10:59:25 AKST
Magnitude 5.2, 42 miles S of Mt. Gareloi, February 14 11:13:18 AKST
Magnitude 5.2, 60 miles S of Mt. Gareloi, February 19 01:11:22 AKST
Magnitude 4.4, 73 miles S of Mt. Gareloi, February 21 07:02:35 AKST
Magnitude 4.3, 60 miles S of Mt. Gareloi, February 19 01:19:05 AKST
Magnitude 4.3, 52 miles E of Yakutat, February 8 01:42:21 AKST
Magnitude 4.2, 53 miles SE of King Cove, February 6 10:39:48 AKST
Magnitude 4.2, 52 miles E of Yakutat, February 24 04:10:24 AKST

This report was compiled by S. Cotton.

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.