Alaska earthquakes

M2.8 earthquake 11 km NNE of Atka, Alaska

A magnitude 2.8 earthquake struck 11 km NNE of Atka, Alaska on Sat, Sep 4, 2021, 8:03 PM HADT (05:03 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.1 47 km S of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.8 (ml), micro
Local time: Sat, Sep 4, 2021, 8:03 PM HADT
UTC: 2021-09-05 05:03:36 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 52.285° N, 174.112° 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 3.1 km horizontally, 1.7 km in depth
Magnitude uncertainty: ±0.18
Depth from: Operator assigned
Station coverage gap: 112°
Stations used: 27

Nearby

Within 100 km, magnitude 1.5 and up: 45 in the 60 days after this one and 61 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 us7000f85y (also filed as av91359331, ak021be89yi9). Read Thu, Sep 24, 2026, 4:03 AM UTC.