Alaska earthquakes

M2.9 earthquake 94 km SW of Adak, Alaska

A magnitude 2.9 earthquake struck 94 km SW of Adak, Alaska on Wed, Dec 1, 2021, 7:55 AM HAST (17:55 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M3.3 52 km SSE of Adak, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 2.9 (ml), micro
Local time: Wed, Dec 1, 2021, 7:55 AM HAST
UTC: 2021-12-01 17:55:31 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.211° N, 177.485° 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: ±0.15
Depth from: Operator assigned
Station coverage gap: 242°, poorly surrounded by stations
Stations used: 27

Nearby

Within 100 km, magnitude 1.5 and up: 166 in the 60 days after this one and 33 in the 30 days before it.

After

The first 60 of 166.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000g9e2 (also filed as ak021febhhkx). Read Thu, Sep 24, 2026, 5:48 AM UTC.