Alaska earthquakes

M3.0 earthquake 140 km E of Atka, Alaska

A magnitude 3.0 earthquake struck 140 km E of Atka, Alaska on Tue, Sep 7, 2021, 8:28 PM HADT (05:28 UTC), 59 km (36 mi) below the surface.

A larger quake followed: M3.7 198 km SW of Nikolski, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.0 (ml), minor
Local time: Tue, Sep 7, 2021, 8:28 PM HADT
UTC: 2021-09-08 05:28:36 UTC
Depth: 58.6 km (36.4 mi), shallow
Epicenter: 52.152° N, 172.145° 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 14.3 km horizontally, 48.1 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 200°, poorly surrounded by stations
Stations used: 31

Nearby

Within 100 km, magnitude 1.5 and up: 15 in the 60 days after this one and 25 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 us6000frkk (also filed as ak021bj71e1p). Read Thu, Sep 24, 2026, 1:29 AM UTC.