Alaska earthquakes

M3.9 earthquake 94 km SSE of Nikolski, Alaska

A magnitude 3.9 earthquake struck 94 km SSE of Nikolski, Alaska on Tue, Nov 23, 2021, 9:53 AM AKST (18:53 UTC), 24 km (15 mi) below the surface.

A larger quake followed: M4.4 105 km SE of Nikolski, Alaska. This one was a foreshock.

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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: Tue, Nov 23, 2021, 9:53 AM AKST
UTC: 2021-11-23 18:53:15 UTC
Depth: 23.9 km (14.9 mi), shallow
Epicenter: 52.224° N, 168.109° 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 4.5 km horizontally, 3.5 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 180°
Stations used: 111

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast211 kmSSW

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 us7000fwik (also filed as ak021f13roe2). Read Wed, Sep 23, 2026, 8:53 PM UTC.