Alaska earthquakes

M2.9 earthquake 74 km W of Atka, Alaska

A magnitude 2.9 earthquake struck 74 km W of Atka, Alaska on Tue, Oct 26, 2021, 3:37 PM HADT (00:37 UTC), 252 km (156 mi) below the surface.

A larger quake followed: M3.7 47 km NE of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.9 (ml), micro
Local time: Tue, Oct 26, 2021, 3:37 PM HADT
UTC: 2021-10-27 00:37:27 UTC
Depth: 251.8 km (156.5 mi), intermediate-depth
Epicenter: 52.112° N, 175.286° 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 40.5 km horizontally, 6.3 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 174°
Stations used: 20

Nearby

Within 100 km, magnitude 1.5 and up: 112 in the 60 days after this one and 41 in the 30 days before it.

After

The first 60 of 112.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000g9rw (also filed as ak021ds5g57v). Read Thu, Sep 24, 2026, 5:04 AM UTC.