Alaska earthquakes

M3.0 earthquake 38 km SSE of Atka, Alaska

A magnitude 3.0 earthquake struck 38 km SSE of Atka, Alaska on Tue, Aug 17, 2021, 3:57 AM HADT (12:57 UTC), 67 km (41 mi) below the surface.

A larger quake followed: M3.2 27 km E of Atka, 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, Aug 17, 2021, 3:57 AM HADT
UTC: 2021-08-17 12:57:41 UTC
Depth: 66.8 km (41.5 mi), shallow
Epicenter: 51.905° N, 173.888° 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 8.7 km horizontally, 26.9 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 206°, poorly surrounded by stations
Stations used: 30

Nearby

Within 100 km, magnitude 1.5 and up: 83 in the 60 days after this one and 68 in the 30 days before it.

After

The first 60 of 83.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000f4df (also filed as ak021aixjzho). Read Thu, Sep 24, 2026, 7:05 AM UTC.