Alaska earthquakes

M3.3 earthquake 268 km ESE of Chiniak, Alaska

A magnitude 3.3 earthquake struck 268 km ESE of Chiniak, Alaska on Sun, Feb 4, 2018, 4:58 PM AKST (01:58 UTC), 25 km (16 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: 3.3 (ml), minor
Local time: Sun, Feb 4, 2018, 4:58 PM AKST
UTC: 2018-02-05 01:58:12 UTC
Depth: 25.2 km (15.6 mi), shallow
Epicenter: 56.540° N, 148.312° 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 7.7 km horizontally, 9.3 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 200°, poorly surrounded by stations
Stations used: 150

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 201 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 201.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000d27n (also filed as ak18340329, ak0181nkae1v). Read Tue, Sep 29, 2026, 7:46 AM UTC.