Alaska earthquakes

M2.8 earthquake 140 km S of Unalaska, Alaska

A magnitude 2.8 earthquake struck 140 km S of Unalaska, Alaska on Wed, Feb 24, 2021, 4:51 AM AKST (13:51 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.2 79 km SSW 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: 2.8 (ml), micro
Local time: Wed, Feb 24, 2021, 4:51 AM AKST
UTC: 2021-02-24 13:51:19 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 52.614° N, 166.560° 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 2.9 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.12
Depth from: Operator assigned
Station coverage gap: 268°, 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. Forecast140 kmS

Nearby

Within 100 km, magnitude 1.5 and up: 32 in the 60 days after this one and 30 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 us7000di9n (also filed as ak0212j6lp7g). Read Thu, Sep 24, 2026, 4:37 AM UTC.