M5.0 earthquake 172 km ENE of Atka, Alaska

A magnitude 5.0 earthquake struck 172 km ENE of Atka, Alaska on Sun, Sep 24, 2023, 6:01 AM HADT (15:01 UTC), 109 km (68 mi) below the surface.

A larger quake followed: M5.6 164 km W of Nikolski, 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
5.0	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.023 · 615 stations
5.0	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.

1 person reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Reviewed by a seismologist.

Within 100 km, magnitude 2.0 and up: 16 in the 60 days after this one and 16 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us7000kxtv (also filed as ak023c9tfgi8). Read Sat, Oct 3, 2026, 2:41 AM UTC.