M2.5 earthquake 172 km WNW of Adak, Alaska

A magnitude 2.5 earthquake struck 172 km WNW of Adak, Alaska on Sun, Mar 23, 2025, 9:01 AM HADT (18:01 UTC), 225 km (140 mi) below the surface.

A larger quake followed: M4.0 150 km WNW 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
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.137 · 7 stations
2.8	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: 97 in the 60 days after this one and 35 in the 30 days before it.

The first 60 of 97.

From the USGS Earthquake Hazards Program and its partner networks, event us6000q6b1 (also filed as ak0253rwsjcz). Read Fri, Oct 2, 2026, 6:00 AM UTC.