Alaska earthquakes

M2.9 earthquake 210 km SSE of Chiniak, Alaska

A magnitude 2.9 earthquake struck 210 km SSE of Chiniak, Alaska on Thu, Dec 16, 2021, 12:35 AM AKST (09:35 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.0 191 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: 2.9 (ml), micro
Local time: Thu, Dec 16, 2021, 12:35 AM AKST
UTC: 2021-12-16 09:35:40 UTC
Depth: 5.8 km (3.6 mi), shallow
Epicenter: 56.045° N, 150.341° 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 8.5 km horizontally, 9.2 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 255°, poorly surrounded by stations
Stations used: 52

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 22 in the 60 days after this one and 11 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000gf3b (also filed as ak021g2zo7ao). Read Wed, Sep 23, 2026, 10:18 PM UTC.