Alaska earthquakes

M3.4 earthquake 200 km SE of Chiniak, Alaska

A magnitude 3.4 earthquake struck 200 km SE of Chiniak, Alaska on Sat, Oct 9, 2021, 5:21 PM AKDT (01:21 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.9 236 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: 3.4 (ml), minor
Local time: Sat, Oct 9, 2021, 5:21 PM AKDT
UTC: 2021-10-10 01:21:22 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.579° N, 149.572° 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 5.2 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.05
Depth from: Operator assigned
Station coverage gap: 244°, poorly surrounded by stations
Stations used: 39

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 10 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000ftes (also filed as ak021d01t78v). Read Wed, Sep 23, 2026, 8:03 PM UTC.