Alaska earthquakes

M3.1 earthquake 34 km WSW of Atka, Alaska

A magnitude 3.1 earthquake struck 34 km WSW of Atka, Alaska on Thu, Oct 14, 2021, 2:52 AM HADT (11:52 UTC), 138 km (86 mi) below the surface.

A larger quake followed: M3.6 93 km ESE 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: Thu, Oct 14, 2021, 2:52 AM HADT
UTC: 2021-10-14 11:52:05 UTC
Depth: 138.3 km (85.9 mi), intermediate-depth
Epicenter: 52.033° N, 174.630° 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 24.6 km horizontally, 20.3 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 208°, poorly surrounded by stations
Stations used: 18

Nearby

Within 100 km, magnitude 1.5 and up: 94 in the 60 days after this one and 31 in the 30 days before it.

After

The first 60 of 94.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000g9lc (also filed as ak021d6u3j0k). Read Thu, Sep 24, 2026, 3:09 AM UTC.