Alaska earthquakes

M3.9 earthquake 77 km SSW of Unalaska, Alaska

A magnitude 3.9 earthquake struck 77 km SSW of Unalaska, Alaska on Sun, Feb 20, 2022, 6:12 PM AKST (03:12 UTC), 20 km (13 mi) below the surface.

A larger quake followed: M5.1 70 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: 3.9 (mb), minor
Local time: Sun, Feb 20, 2022, 6:12 PM AKST
UTC: 2022-02-21 03:12:09 UTC
Depth: 20.1 km (12.5 mi), shallow
Epicenter: 53.202° N, 166.851° 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 2.2 km horizontally, 8.1 km in depth
Magnitude uncertainty: ±0.17
Depth from: From location
Station coverage gap: 190°, poorly surrounded by stations
Stations used: 34

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast78 kmSSW

Nearby

Within 100 km, magnitude 1.5 and up: 174 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of 174.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000h5i6 (also filed as ak0222e1sxxi). Read Sun, Sep 27, 2026, 2:14 AM UTC.