Alaska earthquakes

M3.1 earthquake 169 km SE of Atka, Alaska

A magnitude 3.1 earthquake struck 169 km SE of Atka, Alaska on Fri, Dec 17, 2021, 12:36 AM HAST (10:36 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.3 122 km ESE of Atka, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Fri, Dec 17, 2021, 12:36 AM HAST
UTC: 2021-12-17 10:36:30 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 51.340° N, 172.166° 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 6.2 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 227°, poorly surrounded by stations
Stations used: 28

Nearby

Within 100 km, magnitude 1.5 and up: 17 in the 60 days after this one and 4 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 us6000gd7m (also filed as ak021g4nsz46). Read Thu, Sep 24, 2026, 8:23 AM UTC.