Alaska earthquakes

M3.9 earthquake 234 km SE of Chiniak, Alaska

A magnitude 3.9 earthquake struck 234 km SE of Chiniak, Alaska on Mon, Feb 19, 2018, 9:18 PM AKST (06:18 UTC), 5 km (3 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: 3.9 (mb), minor
Local time: Mon, Feb 19, 2018, 9:18 PM AKST
UTC: 2018-02-20 06:18:56 UTC
Depth: 4.5 km (2.8 mi), shallow
Epicenter: 55.883° N, 150.075° 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 8.3 km horizontally, 6.5 km in depth
Magnitude uncertainty: ±0.36
Depth from: From location
Station coverage gap: 181°, poorly surrounded by stations
Stations used: 61

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 us2000d56q (also filed as ak18465706, ak0182cg3dm2). Read Mon, Sep 28, 2026, 8:43 PM UTC.