Alaska earthquakes

M4.1 earthquake 285 km SE of Chiniak, Alaska

A magnitude 4.1 earthquake struck 285 km SE of Chiniak, Alaska on Tue, Feb 6, 2018, 3:56 PM AKST (00:56 UTC), 12 km (8 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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The earthquake

Magnitude: 4.1 (mb), light
Local time: Tue, Feb 6, 2018, 3:56 PM AKST
UTC: 2018-02-07 00:56:13 UTC
Depth: 12.3 km (7.6 mi), shallow
Epicenter: 55.709° N, 149.170° 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 7.8 km horizontally, 7.3 km in depth
Magnitude uncertainty: ±0.52
Depth from: From location
Station coverage gap: 185°, poorly surrounded by stations
Stations used: 227

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

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000chx1 (also filed as ak0181qur87k, ak18384056). Read Tue, Sep 29, 2026, 3:51 AM UTC.