Alaska earthquakes

M3.8 earthquake 240 km SE of Chiniak, Alaska

A magnitude 3.8 earthquake struck 240 km SE of Chiniak, Alaska on Sun, Mar 18, 2018, 2:23 AM AKDT (10:23 UTC), 22 km (14 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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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.8 (ml), minor
Local time: Sun, Mar 18, 2018, 2:23 AM AKDT
UTC: 2018-03-18 10:23:41 UTC
Depth: 22.0 km (13.7 mi), shallow
Epicenter: 56.034° N, 149.590° 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, 7.0 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 188°, poorly surrounded by stations
Stations used: 179

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 us1000d61z (also filed as ak0183jih2xe, ak18706795). Read Mon, Sep 28, 2026, 9:08 AM UTC.