Alaska earthquakes

M3.5 earthquake 263 km ESE of Chiniak, Alaska

A magnitude 3.5 earthquake struck 263 km ESE of Chiniak, Alaska on Fri, Feb 9, 2018, 4:39 PM AKST (01:39 UTC), 25 km (15 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: 3.5 (mb), minor
Local time: Fri, Feb 9, 2018, 4:39 PM AKST
UTC: 2018-02-10 01:39:34 UTC
Depth: 24.8 km (15.4 mi), shallow
Epicenter: 56.357° N, 148.605° 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 8.1 km horizontally, 9.2 km in depth
Magnitude uncertainty: ±0.35
Depth from: From location
Station coverage gap: 205°, poorly surrounded by stations
Stations used: 96

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 us2000d028 (also filed as ak18418653, ak0181vtv3n4). Read Mon, Sep 28, 2026, 1:05 PM UTC.