WEEK SEISMICITY REPORT FOR AUGUST 25, 2025 TO AUGUST 31, 2025

During the week of August 25, 2025, the Alaska Earthquake Center reported 376 earthquakes within the state. The largest earthquake was magnitude 5.9 that occurred on August 28 at 03:07:47 AKST (August 28, 11:07:47 UTC), 19 miles NE of Semisopochnoi Island.

NOTABLE EVENTS IN DESCENDING ORDER OF MAGNITUDE


Magnitude 5.9, 19 miles NE of Semisopochnoi Island, August 28 03:07:48 AKDT
Magnitude 5.1, 22 miles S of Semisopochnoi Island, August 29 01:14:25 AKDT
Magnitude 5.0, 58 miles S of Sand Point, August 26 00:03:47 AKDT
Magnitude 4.5, 51 miles S of Atka, August 31 13:19:45 AKDT
Magnitude 3.9, 20 miles SW of Seguam Island, August 28 09:59:59 AKDT
Magnitude 3.7, 65 miles S of Herbert Island, August 30 10:30:26 AKDT
Magnitude 3.6, 16 miles N of Koyuk, August 25 12:24:41 AKDT
Magnitude 3.5, 49 miles S of Atka, August 31 07:47:08 AKDT
Magnitude 3.5, 25 miles W of Amchitka, August 25 14:50:13 AKDT
Magnitude 3.4, 23 miles S of Semisopochnoi Island, August 29 14:12:17 AKDT

This report was compiled by Owen Simonds

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.