Alaska earthquakes

M3.1 earthquake 76 km SSW of Atka, Alaska

A magnitude 3.1 earthquake struck 76 km SSW of Atka, Alaska on Thu, Feb 11, 2021, 8:19 AM HAST (18:19 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.7 37 km SSW 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: 3.1 (ml), minor
Local time: Thu, Feb 11, 2021, 8:19 AM HAST
UTC: 2021-02-11 18:19:33 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.628° N, 174.814° 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 2.8 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.13
Depth from: Operator assigned
Station coverage gap: 246°, poorly surrounded by stations
Stations used: 19

Nearby

Within 100 km, magnitude 1.5 and up: 127 in the 60 days after this one and 62 in the 30 days before it.

After

The first 60 of 127.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000ddpz (also filed as ak0211xreix0). Read Sat, Sep 26, 2026, 10:15 AM UTC.