Alaska earthquakes

M3.1 earthquake 253 km ESE of Chiniak, Alaska

A magnitude 3.1 earthquake struck 253 km ESE of Chiniak, Alaska on Wed, Dec 23, 2020, 6:33 AM AKST (15:33 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.5 245 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: 3.1 (ml), minor
Local time: Wed, Dec 23, 2020, 6:33 AM AKST
UTC: 2020-12-23 15:33:44 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.486° N, 148.651° 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 6.0 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.04
Depth from: Operator assigned
Station coverage gap: 253°, poorly surrounded by stations
Stations used: 15

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 27 in the 60 days after this one and 15 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000d2cj (also filed as ak020ggbiy0e). Read Fri, Sep 25, 2026, 6:34 PM UTC.