Alaska earthquakes

M4.2 earthquake 230 km SE of Chiniak, Alaska

A magnitude 4.2 earthquake struck 230 km SE of Chiniak, Alaska on Thu, Mar 22, 2018, 6:49 AM AKDT (14:49 UTC), 27 km (17 mi) below the surface.

A larger quake followed: M5.5 276 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: Thu, Mar 22, 2018, 6:49 AM AKDT
UTC: 2018-03-22 14:49:26 UTC
Depth: 27.1 km (16.8 mi), shallow
Epicenter: 56.032° N, 149.836° 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 4.9 km horizontally, 8.8 km in depth
Magnitude uncertainty: ±0.30
Depth from: From location
Station coverage gap: 175°
Stations used: 110

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 us1000d7im (also filed as ak18726967, ak0183q75qvb). Read Sat, Sep 26, 2026, 1:48 AM UTC.