Alaska earthquakes

M4.2 earthquake 231 km SE of Chiniak, Alaska

A magnitude 4.2 earthquake struck 231 km SE of Chiniak, Alaska on Tue, Jan 23, 2018, 8:17 AM AKST (17:17 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.3 254 km SE 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, 8:17 AM AKST
UTC: 2018-01-23 17:17:20 UTC
Depth: 9.8 km (6.1 mi), shallow
Epicenter: 55.904° N, 150.114° 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 7.5 km horizontally, 7.3 km in depth
Magnitude uncertainty: ±0.38
Depth from: From location
Station coverage gap: 177°
Stations used: 135

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 122 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 us2000cn62 (also filed as ak18184362, ak01812bl1xk). Read Tue, Sep 29, 2026, 6:56 AM UTC.