M4.2 earthquake 83 km SSE of Atka, Alaska

A magnitude 4.2 earthquake struck 83 km SSE of Atka, Alaska on Thu, Jul 28, 2022, 3:13 AM HADT (12:13 UTC), 43 km (27 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
4.2	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.059 · 80 stations
4.2	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 1.5 and up: 130 in the 60 days after this one and 85 in the 30 days before it.

The first 60 of 130.

From the USGS Earthquake Hazards Program and its partner networks, event us6000i65k (also filed as ak0229lujqi9). Read Thu, Oct 1, 2026, 9:25 PM UTC.