Alaska earthquakes

M3.5 earthquake 261 km SE of Chiniak, Alaska

A magnitude 3.5 earthquake struck 261 km SE of Chiniak, Alaska on Sun, Apr 22, 2018, 8:42 PM AKDT (04:42 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.6 230 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: 3.5 (mb), minor
Local time: Sun, Apr 22, 2018, 8:42 PM AKDT
UTC: 2018-04-23 04:42:16 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 55.960° N, 149.229° 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 8.4 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.50
Depth from: Operator assigned
Station coverage gap: 187°, poorly surrounded by stations
Stations used: 146

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 us1000dsfl (also filed as ak19255251, ak01856yczz0). Read Mon, Sep 21, 2026, 8:43 PM UTC.