Alaska earthquakes

M3.9 earthquake 246 km SE of Chiniak, Alaska

A magnitude 3.9 earthquake struck 246 km SE of Chiniak, Alaska on Sat, Apr 28, 2018, 10:17 PM AKDT (06:17 UTC), 20 km (13 mi) below the surface.

A larger quake followed: M4.1 257 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: 3.9 (ml), minor
Local time: Sat, Apr 28, 2018, 10:17 PM AKDT
UTC: 2018-04-29 06:17:25 UTC
Depth: 20.2 km (12.6 mi), shallow
Epicenter: 56.194° N, 149.171° 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 9.1 km horizontally, 11.2 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 240°, poorly surrounded by stations
Stations used: 68

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000dwc2 (also filed as ak19293684, ak0185gwmluc). Read Mon, Sep 21, 2026, 10:39 PM UTC.