M3.8 earthquake 111 km S of Atka, Alaska

A magnitude 3.8 earthquake struck 111 km S of Atka, Alaska on Sat, Oct 29, 2022, 11:05 PM HADT (08:05 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.8 93 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
3.8	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.094 · 30 stations
3.2	ML, local (Richter)	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: 94 in the 60 days after this one and 87 in the 30 days before it.

The first 60 of 94.

From the USGS Earthquake Hazards Program and its partner networks, event us7000im90 (also filed as ak022dx8mtg9). Read Fri, Oct 2, 2026, 4:02 AM UTC.