Alaska earthquakes

M2.4 earthquake 138 km S of Unalaska, Alaska

A magnitude 2.4 earthquake struck 138 km S of Unalaska, Alaska on Sat, Dec 25, 2021, 1:16 AM AKST (10:16 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.4 Fox Islands, Aleutian Islands, 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: 2.4 (ml), micro
Local time: Sat, Dec 25, 2021, 1:16 AM AKST
UTC: 2021-12-25 10:16:30 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 52.637° N, 166.294° 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 3.6 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.15
Depth from: Operator assigned
Station coverage gap: 294°, poorly surrounded by stations
Stations used: 19

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast138 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 us7000gdje (also filed as ak021ghvzf9g). Read Wed, Sep 23, 2026, 11:28 PM UTC.