Alaska earthquakes

M2.7 earthquake 258 km ESE of Chiniak, Alaska

A magnitude 2.7 earthquake struck 258 km ESE of Chiniak, Alaska on Sat, Dec 4, 2021, 8:30 PM AKST (05:30 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.7 258 km ESE 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: 2.7 (ml), micro
Local time: Sat, Dec 4, 2021, 8:30 PM AKST
UTC: 2021-12-05 05:30:05 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.529° N, 148.508° 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 8.6 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.05
Depth from: Operator assigned
Station coverage gap: 228°, poorly surrounded by stations
Stations used: 35

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 18 in the 60 days after this one and 9 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000g9sd (also filed as ak021fkqc9m2). Read Wed, Sep 23, 2026, 4:49 PM UTC.