Alaska earthquakes

M2.9 earthquake 226 km W of Adak, Alaska

A magnitude 2.9 earthquake struck 226 km W of Adak, Alaska on Sun, Oct 31, 2021, 11:28 PM HADT (08:28 UTC), 102 km (63 mi) below the surface.

A larger quake followed: M3.0 Rat Islands, Aleutian Islands, 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: Sun, Oct 31, 2021, 11:28 PM HADT
UTC: 2021-11-01 08:28:17 UTC
Depth: 101.6 km (63.1 mi), intermediate-depth
Epicenter: 51.761° N, 179.916° 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 5.2 km horizontally, 5.6 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 133°
Stations used: 41

Nearby

Within 100 km, magnitude 1.5 and up: 84 in the 60 days after this one and 58 in the 30 days before it.

After

The first 60 of 84.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000ga5w (also filed as ak021e0jucua). Read Thu, Sep 24, 2026, 9:06 AM UTC.