Alaska earthquakes

M3.1 earthquake 236 km SE of Chiniak, Alaska

A magnitude 3.1 earthquake struck 236 km SE of Chiniak, Alaska on Wed, Oct 21, 2020, 7:42 AM AKDT (15:42 UTC), 20 km (13 mi) below the surface.

A larger quake followed: M3.7 251 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: 3.1 (ml), minor
Local time: Wed, Oct 21, 2020, 7:42 AM AKDT
UTC: 2020-10-21 15:42:51 UTC
Depth: 20.2 km (12.5 mi), shallow
Epicenter: 56.231° N, 149.325° 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 6.6 km horizontally, 12.0 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 261°, poorly surrounded by stations
Stations used: 19

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 26 in the 60 days after this one and 13 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000c6zw (also filed as ak020dk4q7ev). Read Tue, Sep 29, 2026, 12:21 PM UTC.