Alaska earthquakes

M3.9 earthquake 230 km SE of Chiniak, Alaska

A magnitude 3.9 earthquake struck 230 km SE of Chiniak, Alaska on Mon, Mar 5, 2018, 10:26 PM AKST (07:26 UTC), 21 km (13 mi) below the surface.

A larger quake followed: M5.4 252 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: 3.9 (ml), minor
Local time: Mon, Mar 5, 2018, 10:26 PM AKST
UTC: 2018-03-06 07:26:31 UTC
Depth: 21.1 km (13.1 mi), shallow
Epicenter: 56.029° N, 149.856° 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 7.0 km horizontally, 8.8 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 192°, poorly surrounded by stations
Stations used: 191

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 at least 200 in the 30 days before it.

After

The first 60 of at least 202.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000dcsa (also filed as ak0182zm98or, ak18598192). Read Sun, Sep 27, 2026, 8:38 PM UTC.