Alaska earthquakes

M2.9 earthquake 36 km ENE of Atka, Alaska

A magnitude 2.9 earthquake struck 36 km ENE of Atka, Alaska on Thu, Sep 2, 2021, 11:31 PM HADT (08:31 UTC), 179 km (111 mi) below the surface.

A larger quake followed: M4.0 69 km SSE of Atka, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 2.9 (ml), micro
Local time: Thu, Sep 2, 2021, 11:31 PM HADT
UTC: 2021-09-03 08:31:16 UTC
Depth: 178.7 km (111.0 mi), intermediate-depth
Epicenter: 52.352° N, 173.736° 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 22.6 km horizontally, 3.4 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 175°
Stations used: 35

Nearby

Within 100 km, magnitude 1.5 and up: 40 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 us7000ff1l (also filed as ak021baz5joq). Read Sat, Sep 26, 2026, 4:49 PM UTC.