Alaska earthquakes

M3.6 earthquake 279 km ESE of Chiniak, Alaska

A magnitude 3.6 earthquake struck 279 km ESE of Chiniak, Alaska on Sun, Sep 20, 2020, 7:05 PM AKDT (03:05 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.8 Gulf of 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: 3.6 (ml), minor
Local time: Sun, Sep 20, 2020, 7:05 PM AKDT
UTC: 2020-09-21 03:05:06 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.378° N, 148.268° 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 5.6 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.04
Depth from: Operator assigned
Station coverage gap: 236°, poorly surrounded by stations
Stations used: 34

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 19 in the 60 days after this one and 14 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000bqn0 (also filed as ak020c6b8cra). Read Mon, Sep 28, 2026, 8:12 PM UTC.