M3.8 earthquake 22 km ENE of Atka, Alaska

A magnitude 3.8 earthquake struck 22 km ENE of Atka, Alaska on Tue, May 21, 2024, 3:52 AM HADT (12:52 UTC), 76 km (47 mi) below the surface.

A larger quake followed: M5.0 66 km W 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
3.8	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.084 · 36 stations
3.9	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.

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 198 in the 60 days after this one and 42 in the 30 days before it.

The first 60 of 198.

From the USGS Earthquake Hazards Program and its partner networks, event us6000n00x (also filed as ak0246j1r3ce). Read Thu, Oct 1, 2026, 3:27 PM UTC.