Alaska earthquakes

M2.9 earthquake 259 km ESE of Chiniak, Alaska

A magnitude 2.9 earthquake struck 259 km ESE of Chiniak, Alaska on Fri, Apr 23, 2021, 1:02 AM AKDT (09:02 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.0 246 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: 2.9 (ml), micro
Local time: Fri, Apr 23, 2021, 1:02 AM AKDT
UTC: 2021-04-23 09:02:21 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.436° N, 148.591° 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 9.5 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.05
Depth from: Operator assigned
Station coverage gap: 256°, 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: 39 in the 60 days after this one and 20 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000e40c (also filed as ak0215713rgd). Read Thu, Sep 24, 2026, 7:00 AM UTC.