Alaska earthquakes

M4.2 earthquake 236 km SE of Chiniak, Alaska

A magnitude 4.2 earthquake struck 236 km SE of Chiniak, Alaska on Sat, Apr 21, 2018, 9:04 AM AKDT (17:04 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.8 224 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: 4.2 (mb), light
Local time: Sat, Apr 21, 2018, 9:04 AM AKDT
UTC: 2018-04-21 17:04:55 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.185° N, 149.396° 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 5.9 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.13
Depth from: Operator assigned
Station coverage gap: 143°
Stations used: 297

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 us1000dpy4 (also filed as ak01853usyq2, ak19249926). Read Mon, Sep 21, 2026, 5:54 PM UTC.