Alaska earthquakes

M3.5 earthquake 36 km WNW of Atka, Alaska

A magnitude 3.5 earthquake struck 36 km WNW of Atka, Alaska on Wed, Dec 29, 2021, 5:20 AM HAST (15:20 UTC), 188 km (117 mi) below the surface.

A larger quake followed: M4.2 26 km ENE of Atka, Alaska. This one was a foreshock.

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 3.5 (ml), minor
Local time: Wed, Dec 29, 2021, 5:20 AM HAST
UTC: 2021-12-29 15:20:24 UTC
Depth: 188.4 km (117.1 mi), intermediate-depth
Epicenter: 52.303° N, 174.707° 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 19.5 km horizontally, 2.7 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 177°
Stations used: 25

Nearby

Within 100 km, magnitude 1.5 and up: 70 in the 60 days after this one and 20 in the 30 days before it.

After

The first 60 of 70.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000gfz2 (also filed as ak021gol4tjw). Read Thu, Sep 24, 2026, 4:29 PM UTC.