M2.9 earthquake 48 km ESE of Adak, Alaska

A magnitude 2.9 earthquake struck 48 km ESE of Adak, Alaska on Sat, Aug 16, 2025, 10:19 AM HADT (19:19 UTC), 63 km (39 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
2.9	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.085 · 18 stations
2.5	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: 83 in the 60 days after this one and 112 in the 30 days before it.

The first 60 of 83.

From the USGS Earthquake Hazards Program and its partner networks, event us6000rh1v (also filed as ak025ahdyi1f). Read Fri, Oct 2, 2026, 2:40 PM UTC.