Alaska earthquakes

M3.7 earthquake 83 km SSW of Unalaska, Alaska

A magnitude 3.7 earthquake struck 83 km SSW of Unalaska, Alaska on Sun, Feb 20, 2022, 6:28 PM AKST (03:28 UTC), 34 km (21 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: 3.7 (ml), minor
Local time: Sun, Feb 20, 2022, 6:28 PM AKST
UTC: 2022-02-21 03:28:07 UTC
Depth: 33.7 km (20.9 mi), shallow
Epicenter: 53.144° N, 166.792° 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 2.5 km horizontally, 8.5 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 240°, 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. Forecast83 kmSSW

Nearby

Within 100 km, magnitude 1.5 and up: 173 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of 173.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000h5i7 (also filed as ak0222e1wd75). Read Tue, Sep 29, 2026, 6:17 AM UTC.