Alaska earthquakes

M3.1 earthquake 246 km W of Adak, Alaska

A magnitude 3.1 earthquake struck 246 km W of Adak, Alaska on Mon, Nov 1, 2021, 9:45 AM GMT+12 (21:45 UTC), 164 km (102 mi) below the surface.

A larger quake followed: M4.2 273 km WSW of Adak, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Mon, Nov 1, 2021, 9:45 AM GMT+12
UTC: 2021-10-31 21:45:32 UTC
Depth: 164.1 km (101.9 mi), intermediate-depth
Epicenter: 51.899° N, 179.791° E
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 14.3 km horizontally, 9.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 134°
Stations used: 49

Nearby

Within 100 km, magnitude 1.5 and up: 99 in the 60 days after this one and 55 in the 30 days before it.

After

The first 60 of 99.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000fus9 (also filed as ak021dz45bjq). Read Thu, Sep 24, 2026, 12:12 PM UTC.