M3.9 earthquake 97 km S of Atka, Alaska

A magnitude 3.9 earthquake struck 97 km S of Atka, Alaska on Sat, Oct 29, 2022, 3:19 AM HADT (12:19 UTC), 41 km (25 mi) below the surface.

A larger quake followed: M4.8 83 km ESE 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
3.9	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.071 · 55 stations
3.9	mb, body-wave	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: 141 in the 60 days after this one and 52 in the 30 days before it.

The first 60 of 141.

From the USGS Earthquake Hazards Program and its partner networks, event us7000il73 (also filed as ak022dvnk6t9). Read Mon, Oct 5, 2026, 9:15 AM UTC.