M3.9 earthquake 25 km ENE of Atka, Alaska

A magnitude 3.9 earthquake struck 25 km ENE of Atka, Alaska on Wed, May 24, 2023, 3:42 AM HADT (12:42 UTC), 121 km (75 mi) below the surface.

A larger quake followed: M4.2 33 km NNW of Atka, 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
3.9	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.081 · 40 stations
3.7	ML, local (Richter)	Alaska Earthquake Center	Preliminary

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 69 in the 60 days after this one and 17 in the 30 days before it.

The first 60 of 69.

From the USGS Earthquake Hazards Program and its partner networks, event us7000k3fx (also filed as ak0236mcs862). Read Fri, Oct 2, 2026, 4:29 PM UTC.