Alaska earthquakes

M3.8 earthquake 239 km SE of Chiniak, Alaska

A magnitude 3.8 earthquake struck 239 km SE of Chiniak, Alaska on Tue, Apr 10, 2018, 1:51 AM AKDT (09:51 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.6 229 km SE 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: Tue, Apr 10, 2018, 1:51 AM AKDT
UTC: 2018-04-10 09:51:57 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 55.871° N, 149.975° 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 7.2 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.06
Depth from: Operator assigned
Station coverage gap: 196°, poorly surrounded by stations
Stations used: 164

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 199 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 199.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000dxf3 (also filed as ak19195915, ak0184ljer7g). Read Fri, Sep 25, 2026, 7:10 PM UTC.