WEEK SEISMICITY REPORT FOR AUGUST 18, 2025 TO AUGUST 24, 2025
During the week of August 18, 2025, the Alaska Earthquake Center reported 471 earthquakes within the state. The largest earthquake was magnitude 4.3 that occurred on August 17 at 22:10:41 AKST (August 18, 06:10:41 UTC), 50 miles S of Mt. Gareloi.
Other notable events were a magnitude 3.0 earthquake that occurred on August 20, 2025 12:34:45 AKDT, 11 miles N of Nenana, then 1 minute later, a magnitude 4.2 earthquake that occurred on August 20, 2025 12:35:27 AKDT, 13 miles N of Nenana at the almost same area. Including these, there were four events were reported as felt this week.
Regarding the magnitude 7.3 Sand Point earthquake on July 16, the number of aftershocks decreased to nearly 80 events during this week, ranging from 1.5 to 3.8 in magnitude.
There were three icequakes this week in the area of Prince William Sound and Glacier Bay National Park.
NOTABLE EVENTS IN DESCENDING ORDER OF MAGNITUDE
Magnitude 4.3, 50 miles S of Mt. Gareloi, August 17 22:10:41 AKDT
Magnitude 4.2, 13 miles N of Nenana, August 20 12:35:28 AKDT
Magnitude 3.8, 63 miles SE of Sand Point, August 19 00:25:00 AKDT
Magnitude 3.8, 32 miles S of Amchitka, August 21 16:18:30 AKDT
Magnitude 3.7, 18 miles SW of Redoubt Volcano, August 23 08:23:18 AKDT
Magnitude 3.6, 36 miles SE of Atka, August 24 00:16:01 AKDT
Magnitude 3.6, 63 miles S of Yunaska Island, August 24 15:15:47 AKDT
Magnitude 3.6, 39 miles S of Bobrof Island, August 24 03:12:25 AKDT
Magnitude 3.4, 49 miles SW of Kaktovik, August 23 00:00:45 AKDT
Magnitude 3.3, 23 miles SE of Burwash Landing, August 21 22:20:16 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.