M3.7 earthquake 52 km SSE of Adak, Alaska

A magnitude 3.7 earthquake struck 52 km SSE of Adak, Alaska on Sun, Aug 10, 2025, 3:15 PM HADT (00:15 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.4 100 km SW of Atka, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
3.7	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.19 · 7 stations
3.5	ML, local (Richter)	Alaska Earthquake Center	Preliminary

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 105 in the 60 days after this one and 139 in the 30 days before it.

The first 60 of 105.

From the USGS Earthquake Hazards Program and its partner networks, event us6000r0zf (also filed as ak025a8sxq6d). Read Fri, Oct 2, 2026, 9:21 AM UTC.