Alaska earthquakes

M4.2 earthquake 242 km SE of Chiniak, Alaska

A magnitude 4.2 earthquake struck 242 km SE of Chiniak, Alaska on Tue, Jan 23, 2018, 11:20 AM AKST (20:20 UTC), 17 km (11 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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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, 11:20 AM AKST
UTC: 2018-01-23 20:20:12 UTC
Depth: 17.1 km (10.6 mi), shallow
Epicenter: 56.108° N, 149.412° 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 6.9 km horizontally, 6.6 km in depth
Magnitude uncertainty: ±0.11
Depth from: From location
Station coverage gap: 142°
Stations used: 231

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 186 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 us2000cnbx (also filed as ak18188762, ak01812ddz56). Read Tue, Sep 29, 2026, 1:46 AM UTC.