Alaska earthquakes

M3.5 earthquake 229 km SE of Chiniak, Alaska

A magnitude 3.5 earthquake struck 229 km SE of Chiniak, Alaska on Thu, Aug 12, 2021, 8:06 PM AKDT (04:06 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.6 282 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: 3.5 (ml), minor
Local time: Thu, Aug 12, 2021, 8:06 PM AKDT
UTC: 2021-08-13 04:06:50 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.066° N, 149.801° 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 7.4 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.05
Depth from: Operator assigned
Station coverage gap: 185°, poorly surrounded by stations
Stations used: 38

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 31 in the 60 days after this one and 28 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000f58b (also filed as ak021ac6c7kt). Read Wed, Sep 23, 2026, 11:10 PM UTC.