Alaska earthquakes

M3.9 earthquake 228 km SSE of Chiniak, Alaska

A magnitude 3.9 earthquake struck 228 km SSE of Chiniak, Alaska on Wed, Feb 7, 2018, 11:57 PM AKST (08:57 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M5.2 228 km SE of Chiniak, Alaska. This one was a foreshock.

Womens Bay forecast More in Alaska

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: Wed, Feb 7, 2018, 11:57 PM AKST
UTC: 2018-02-08 08:57:32 UTC
Depth: 6.0 km (3.7 mi), shallow
Epicenter: 55.913° N, 150.193° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 8.0 km horizontally, 6.6 km in depth
Magnitude uncertainty: ±0.36
Depth from: From location
Station coverage gap: 213°, poorly surrounded by stations
Stations used: 125

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 us2000cyqz (also filed as ak18413614, ak0181sn2at7). Read Mon, Sep 28, 2026, 4:22 PM UTC.