Alaska earthquakes

M3.3 earthquake 74 km SSW of Unalaska, Alaska

A magnitude 3.3 earthquake struck 74 km SSW of Unalaska, Alaska on Tue, Feb 23, 2021, 5:57 AM AKST (14:57 UTC), 35 km (22 mi) below the surface.

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: 3.3 (ml), minor
Local time: Tue, Feb 23, 2021, 5:57 AM AKST
UTC: 2021-02-23 14:57:39 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 53.224° N, 166.781° 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 5.6 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 203°, poorly surrounded by stations
Stations used: 22

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast74 kmSSW

Nearby

Within 100 km, magnitude 1.5 and up: 67 in the 60 days after this one and 38 in the 30 days before it.

After

The first 60 of 67.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000di4s (also filed as ak0212hjp3z6). Read Wed, Sep 23, 2026, 7:58 PM UTC.