Alaska earthquakes

M3.1 earthquake 230 km SE of Chiniak, Alaska

A magnitude 3.1 earthquake struck 230 km SE of Chiniak, Alaska on Mon, Oct 18, 2021, 6:17 PM AKDT (02:17 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.2 224 km SSE 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: Mon, Oct 18, 2021, 6:17 PM AKDT
UTC: 2021-10-19 02:17:00 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.266° N, 149.400° 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 7.3 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.06
Depth from: Operator assigned
Station coverage gap: 218°, poorly surrounded by stations
Stations used: 49

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 28 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 us6000fvvt (also filed as ak021dey7xrz). Read Wed, Sep 23, 2026, 8:03 PM UTC.