Alaska earthquakes

M4.0 earthquake 201 km SE of Chiniak, Alaska

A magnitude 4.0 earthquake struck 201 km SE of Chiniak, Alaska on Sun, Feb 11, 2018, 5:39 PM AKST (02:39 UTC), 22 km (14 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: 4.0 (mb), light
Local time: Sun, Feb 11, 2018, 5:39 PM AKST
UTC: 2018-02-12 02:39:49 UTC
Depth: 22.1 km (13.7 mi), shallow
Epicenter: 56.339° N, 149.935° 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 7.3 km horizontally, 9.3 km in depth
Magnitude uncertainty: ±0.52
Depth from: From location
Station coverage gap: 187°, poorly surrounded by stations
Stations used: 199

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 us2000d0qz (also filed as ak18430504, ak0181z5j9gm). Read Mon, Sep 28, 2026, 7:16 PM UTC.