Alaska earthquakes

M3.7 earthquake 258 km ESE of Chiniak, Alaska

A magnitude 3.7 earthquake struck 258 km ESE of Chiniak, Alaska on Fri, Dec 10, 2021, 9:47 PM AKST (06:47 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.9 222 km SE of Chiniak, Alaska. This one was a foreshock.

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Map

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

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The earthquake

Magnitude: 3.7 (mb), minor
Local time: Fri, Dec 10, 2021, 9:47 PM AKST
UTC: 2021-12-11 06:47:34 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.386° N, 148.663° 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.

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 8.1 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.29
Depth from: Operator assigned
Station coverage gap: 174°
Stations used: 142

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 25 in the 60 days after this one and 8 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 us6000gbdb (also filed as ak021fuo9hhz). Read Wed, Sep 23, 2026, 10:15 PM UTC.