M2.8 earthquake 110 km SSE of Adak, Alaska

A magnitude 2.8 earthquake struck 110 km SSE of Adak, Alaska on Thu, May 22, 2025, 4:03 PM HADT (01:03 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.5 59 km SSE of Adak, 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
2.8	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.128 · 8 stations
2.3	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: 181 in the 60 days after this one and 75 in the 30 days before it.

The first 60 of 181.

From the USGS Earthquake Hazards Program and its partner networks, event us6000qgj2 (also filed as ak0256kigrf9). Read Fri, Oct 2, 2026, 7:35 AM UTC.