Alaska earthquakes

M4.2 earthquake 261 km ESE of Chiniak, Alaska

A magnitude 4.2 earthquake struck 261 km ESE of Chiniak, Alaska on Tue, Jan 23, 2018, 4:09 AM AKST (13:09 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.5 256 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: 4.2 (mb), light
Local time: Tue, Jan 23, 2018, 4:09 AM AKST
UTC: 2018-01-23 13:09:07 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.367° N, 148.627° 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 6.5 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.53
Depth from: Operator assigned
Station coverage gap: 230°, poorly surrounded by stations
Stations used: 41

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 200 in the 60 days after this one and 76 in the 30 days before it.

After

The first 60 of at least 200.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000cn2i (also filed as ak0181295kjc, ak18178819). Read Tue, Sep 29, 2026, 6:56 AM UTC.