Alaska earthquakes

M2.8 earthquake 90 km S of Unalaska, Alaska

A magnitude 2.8 earthquake struck 90 km S of Unalaska, Alaska on Fri, Oct 15, 2021, 4:20 AM AKDT (12:20 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M5.2 69 km ESE 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: 2.8 (ml), micro
Local time: Fri, Oct 15, 2021, 4:20 AM AKDT
UTC: 2021-10-15 12:20:29 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 53.073° N, 166.776° 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 1.5 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 226°, poorly surrounded by stations
Stations used: 21

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast91 kmS

Nearby

Within 100 km, magnitude 1.5 and up: 94 in the 60 days after this one and 40 in the 30 days before it.

After

The first 60 of 94.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000g9u3 (also filed as ak021d8i1iin). Read Thu, Sep 24, 2026, 1:49 PM UTC.