Alaska earthquakes

M3.1 earthquake 113 km SE of Atka, Alaska

A magnitude 3.1 earthquake struck 113 km SE of Atka, Alaska on Fri, Sep 3, 2021, 2:56 PM HADT (23:56 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M3.4 64 km SSE of Atka, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Fri, Sep 3, 2021, 2:56 PM HADT
UTC: 2021-09-03 23:56:53 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.540° N, 172.933° 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 6.5 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.13
Depth from: Operator assigned
Station coverage gap: 220°, poorly surrounded by stations
Stations used: 20

Nearby

Within 100 km, magnitude 1.5 and up: 26 in the 60 days after this one and 55 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000ff21 (also filed as ak021bb88ki4). Read Thu, Sep 24, 2026, 7:00 AM UTC.