Alaska earthquakes

M3.4 earthquake 249 km SE of Chiniak, Alaska

A magnitude 3.4 earthquake struck 249 km SE of Chiniak, Alaska on Sun, Sep 19, 2021, 11:21 PM AKDT (07:21 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.8 Gulf of Alaska. This one was a foreshock.

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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: Sun, Sep 19, 2021, 11:21 PM AKDT
UTC: 2021-09-20 07:21:28 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.089° N, 149.276° 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 8.9 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.05
Depth from: Operator assigned
Station coverage gap: 234°, poorly surrounded by stations
Stations used: 31

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 27 in the 60 days after this one and 16 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000fcu2 (also filed as ak021c32mvm7). Read Wed, Sep 23, 2026, 8:42 PM UTC.