M4.6 earthquake 164 km S of Atka, Alaska

A magnitude 4.6 earthquake struck 164 km S of Atka, Alaska on Sat, Apr 22, 2023, 3:54 AM HADT (12:54 UTC), 10 km (6 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
4.6	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.032 · 285 stations
4.6	mb, body-wave	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 1.6 and up: 38 in the 60 days after this one and 4 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us6000k6d7 (also filed as ak02355fn356). Read Thu, Oct 1, 2026, 5:12 PM UTC.