M2.2 earthquake 40 km SE of Unalaska, Alaska

A magnitude 2.2 earthquake struck 40 km SE of Unalaska, Alaska on Mon, Dec 20, 2021, 11:40 AM AKST (20:40 UTC), 63 km (39 mi) below the surface.

A larger quake followed: M2.9 26 km E of Unalaska, 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: 200 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 200.

From the USGS Earthquake Hazards Program and its partner networks, event ak021g9se5v7. Read Wed, Sep 23, 2026, 5:03 AM UTC.