M3.2 earthquake 43 km ESE of Atka, Alaska

A magnitude 3.2 earthquake struck 43 km ESE of Atka, Alaska on Sun, Aug 13, 2023, 7:36 PM HADT (04:36 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.2 79 km SSE of Atka, 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
3.2	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.115 · 10 stations
2.7	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: 183 in the 60 days after this one and 60 in the 30 days before it.

The first 60 of 183.

From the USGS Earthquake Hazards Program and its partner networks, event us7000kr22 (also filed as ak023adu1zz5). Read Thu, Oct 1, 2026, 9:58 PM UTC.