M3.1 earthquake Alaska Peninsula

A magnitude 3.1 earthquake struck in the Alaska Peninsula on Thu, Aug 24, 2023, 2:37 AM AKDT (10:37 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M5.0 121 km SSW of Sand Point, 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
3.1	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.148 · 6 stations
2.6	ML, local (Richter)	Alaska Earthquake Center	Preliminary

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 164 in the 60 days after this one and 133 in the 30 days before it.

The first 60 of 164.

From the USGS Earthquake Hazards Program and its partner networks, event us7000kuct (also filed as ak023auh06ef). Read Thu, Oct 1, 2026, 1:57 PM UTC.