M2.8 earthquake 238 km ESE of Atka, Alaska

A magnitude 2.8 earthquake struck 238 km ESE of Atka, Alaska on Tue, Oct 31, 2023, 10:53 PM HADT (07:53 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.8 186 km SW 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
2.8	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.097 · 14 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: 12 in the 60 days after this one and 7 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us6000lppg (also filed as ak023e0jecba). Read Mon, Oct 5, 2026, 6:54 AM UTC.