Alaska earthquakes

M3.2 earthquake 116 km S of Unalaska, Alaska

A magnitude 3.2 earthquake struck 116 km S of Unalaska, Alaska on Thu, Dec 16, 2021, 1:40 AM AKST (10:40 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M6.2 71 km S of Unalaska, Alaska. This one was a foreshock.

Unalaska forecast More in Alaska

Map

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

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The earthquake

Magnitude: 3.2 (ml), minor
Local time: Thu, Dec 16, 2021, 1:40 AM AKST
UTC: 2021-12-16 10:40:35 UTC
Depth: 2.3 km (1.4 mi), shallow
Epicenter: 52.831° N, 166.755° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.9 km horizontally, 7.9 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 222°, poorly surrounded by stations
Stations used: 23

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast117 kmS

Nearby

Within 100 km, magnitude 1.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000gf3c (also filed as ak021g30aglv). Read Wed, Sep 23, 2026, 9:38 AM UTC.