Alaska earthquakes

M3.1 earthquake 230 km ESE of Chiniak, Alaska

A magnitude 3.1 earthquake struck 230 km ESE of Chiniak, Alaska on Thu, Feb 1, 2018, 6:04 PM AKST (03:04 UTC), 26 km (16 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: Thu, Feb 1, 2018, 6:04 PM AKST
UTC: 2018-02-02 03:04:42 UTC
Depth: 25.6 km (15.9 mi), shallow
Epicenter: 56.594° N, 148.964° 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 7.6 km horizontally, 10.0 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 213°, poorly surrounded by stations
Stations used: 52

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 201 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 201.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000czw4 (also filed as ak18417625, ak0181imjpey). Read Mon, Sep 28, 2026, 9:15 PM UTC.