Alaska earthquakes

M3.1 earthquake 229 km SE of Chiniak, Alaska

A magnitude 3.1 earthquake struck 229 km SE of Chiniak, Alaska on Mon, Feb 12, 2018, 6:35 AM AKST (15:35 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M5.2 228 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: 3.1 (ml), minor
Local time: Mon, Feb 12, 2018, 6:35 AM AKST
UTC: 2018-02-12 15:35:21 UTC
Depth: 20.0 km (12.4 mi), shallow
Epicenter: 55.977° N, 150.004° 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 8.2 km horizontally, 7.9 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 228°, poorly surrounded by stations
Stations used: 49

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 us2000d79u (also filed as ak18506358, ak0181zd8z5s). Read Tue, Sep 29, 2026, 7:45 AM UTC.