M3.5 earthquake 90 km SE of Atka, Alaska

A magnitude 3.5 earthquake struck 90 km SE of Atka, Alaska on Mon, Sep 5, 2022, 2:43 AM HADT (11:43 UTC), 36 km (22 mi) below the surface.

A larger quake followed: M4.7 Andreanof Islands, Aleutian Islands, 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
3.5	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.082 · 36 stations
2.9	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: 129 in the 60 days after this one and 54 in the 30 days before it.

The first 60 of 129.

From the USGS Earthquake Hazards Program and its partner networks, event us7000i7mt (also filed as ak022bec3398). Read Fri, Oct 2, 2026, 5:41 AM UTC.