M2.0 earthquake 127 km S of Unalaska, Alaska

A magnitude 2.0 earthquake struck 127 km S of Unalaska, Alaska on Sun, Oct 31, 2021, 7:31 PM AKDT (03:31 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M2.6 86 km ENE of Nikolski, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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: 67 in the 60 days after this one and 34 in the 30 days before it.

The first 60 of 67.

From the USGS Earthquake Hazards Program and its partner networks, event ak021e0gvu1b. Read Wed, Sep 23, 2026, 10:51 PM UTC.