Alaska earthquakes

M2.5 earthquake 56 km W of Nikolski, Alaska

A magnitude 2.5 earthquake struck 56 km W of Nikolski, Alaska on Thu, Nov 18, 2021, 4:30 AM AKST (13:30 UTC), 85 km (53 mi) below the surface.

A larger quake followed: M4.2 71 km SW of Nikolski, 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: 2.5 (ml), micro
Local time: Thu, Nov 18, 2021, 4:30 AM AKST
UTC: 2021-11-18 13:30:43 UTC
Depth: 85.2 km (52.9 mi), intermediate-depth
Epicenter: 52.941° N, 169.703° 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 5.8 km horizontally, 8.1 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 160°
Stations used: 22

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast234 kmWSW

Nearby

Within 100 km, magnitude 1.5 and up: 29 in the 60 days after this one and 12 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000gdwy (also filed as ak021esqywn4). Read Wed, Sep 30, 2026, 10:38 AM UTC.