Alaska earthquakes

M4.3 earthquake 107 km SSW of Atka, Alaska

A magnitude 4.3 earthquake struck 107 km SSW of Atka, Alaska on Thu, Dec 2, 2021, 11:42 AM HAST (21:42 UTC), 32 km (20 mi) below the surface.

Map

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

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The earthquake

Magnitude: 4.3 (mb), light
Local time: Thu, Dec 2, 2021, 11:42 AM HAST
UTC: 2021-12-02 21:42:57 UTC
Depth: 32.0 km (19.9 mi), shallow
Epicenter: 51.301° N, 174.794° W
Region: Alaska
Strongest shaking: I, not felt shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: I, not felt shaking
Peak ground acceleration: 0.0% of gravity
Peak ground velocity: -4.0 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

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 2.6 km horizontally, 5.9 km in depth
Magnitude uncertainty: ±0.27
Depth from: From location
Station coverage gap: 234°, poorly surrounded by stations
Stations used: 35

Nearby

Within 100 km, magnitude 1.5 and up: 84 in the 60 days after this one and 57 in the 30 days before it.

After

The first 60 of 84.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000g8kb (also filed as ak021fg1bbop). Read Thu, Sep 24, 2026, 11:30 AM UTC.