M3.9 earthquake 150 km WNW of Adak, Alaska

A magnitude 3.9 earthquake struck 150 km WNW of Adak, Alaska on Thu, Feb 27, 2025, 6:37 PM HAST (04:37 UTC), 238 km (148 mi) below the surface.

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
3.9	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.112 · 21 stations
3.2	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: 62 in the 60 days after this one and 33 in the 30 days before it.

The first 60 of 62.

From the USGS Earthquake Hazards Program and its partner networks, event us6000pxg4 (also filed as ak0252pnb63x). Read Fri, Oct 2, 2026, 8:58 AM UTC.