Alaska earthquakes

M4.1 earthquake 270 km ESE of Chiniak, Alaska

A magnitude 4.1 earthquake struck 270 km ESE of Chiniak, Alaska on Thu, Mar 29, 2018, 12:12 PM AKDT (20:12 UTC), 10 km (6 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: 4.1 (mb), light
Local time: Thu, Mar 29, 2018, 12:12 PM AKDT
UTC: 2018-03-29 20:12:07 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.329° N, 148.506° 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 5.0 km horizontally, 1.8 km in depth
Magnitude uncertainty: ±0.30
Depth from: Operator assigned
Station coverage gap: 161°
Stations used: 54

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 us1000db02 (also filed as ak18822687, ak01841v9t6w). Read Fri, Sep 25, 2026, 7:29 PM UTC.