M2.7 earthquake 230 km W of Adak, Alaska

A magnitude 2.7 earthquake struck 230 km W of Adak, Alaska on Wed, May 28, 2025, 9:05 PM HADT (06:05 UTC), 171 km (106 mi) below the surface.

A larger quake followed: M5.0 275 km WSW 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
2.7	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.105 · 12 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: 160 in the 60 days after this one and 64 in the 30 days before it.

The first 60 of 160.

From the USGS Earthquake Hazards Program and its partner networks, event us6000qht6 (also filed as ak0256uiogx4). Read Fri, Oct 2, 2026, 3:02 AM UTC.