M2.8 earthquake 189 km WSW of Adak, Alaska

A magnitude 2.8 earthquake struck 189 km WSW of Adak, Alaska on Tue, Feb 27, 2024, 11:39 AM HAST (21:39 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.9 254 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
2.8	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.097 · 14 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: 166 in the 60 days after this one and 88 in the 30 days before it.

The first 60 of 166.

From the USGS Earthquake Hazards Program and its partner networks, event us6000mji4 (also filed as ak0242o9wo03). Read Thu, Oct 1, 2026, 7:47 AM UTC.