Alaska earthquakes

M2.6 earthquake 223 km SSE of Chiniak, Alaska

A magnitude 2.6 earthquake struck 223 km SSE of Chiniak, Alaska on Fri, Apr 20, 2018, 4:36 AM AKDT (12:36 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M3.1 266 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: 2.6 (ml), micro
Local time: Fri, Apr 20, 2018, 4:36 AM AKDT
UTC: 2018-04-20 12:36:56 UTC
Depth: 4.1 km (2.5 mi), shallow
Epicenter: 55.917° N, 150.306° 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 5.1 km horizontally, 8.0 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 241°, poorly surrounded by stations
Stations used: 26

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 us1000drac (also filed as ak19263854, ak018524h7wb). Read Mon, Sep 21, 2026, 9:16 PM UTC.