Alaska earthquakes

M3.1 earthquake 268 km ESE of Chiniak, Alaska

A magnitude 3.1 earthquake struck 268 km ESE of Chiniak, Alaska on Wed, Feb 21, 2018, 11:19 AM AKST (20:19 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.4 252 km ESE 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, Feb 21, 2018, 11:19 AM AKST
UTC: 2018-02-21 20:19:13 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.604° N, 148.249° 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 4.3 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.04
Depth from: Operator assigned
Station coverage gap: 193°, poorly surrounded by stations
Stations used: 76

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 202 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 202.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000dbfa (also filed as ak18479576, ak0182ebytvp). Read Mon, Sep 28, 2026, 8:17 AM UTC.