Alaska earthquakes

M2.7 earthquake 108 km S of Atka, Alaska

A magnitude 2.7 earthquake struck 108 km S of Atka, Alaska on Sun, Oct 31, 2021, 5:56 AM HADT (14:56 UTC), 28 km (17 mi) below the surface.

A larger quake followed: M4.0 97 km S of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.7 (ml), micro
Local time: Sun, Oct 31, 2021, 5:56 AM HADT
UTC: 2021-10-31 14:56:11 UTC
Depth: 27.7 km (17.2 mi), shallow
Epicenter: 51.236° N, 174.439° 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 2.7 km horizontally, 11.5 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 219°, poorly surrounded by stations
Stations used: 24

Nearby

Within 100 km, magnitude 1.5 and up: 74 in the 60 days after this one and 29 in the 30 days before it.

After

The first 60 of 74.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000fus5 (also filed as ak021dz01mn8). Read Thu, Sep 24, 2026, 10:10 AM UTC.