Alaska earthquakes

M4.2 earthquake 231 km SE of Chiniak, Alaska

A magnitude 4.2 earthquake struck 231 km SE of Chiniak, Alaska on Wed, May 9, 2018, 5:40 AM AKDT (13:40 UTC), 20 km (12 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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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: Wed, May 9, 2018, 5:40 AM AKDT
UTC: 2018-05-09 13:40:49 UTC
Depth: 20.0 km (12.4 mi), shallow
Epicenter: 56.029° N, 149.811° 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 7.0 km horizontally, 6.0 km in depth
Magnitude uncertainty: ±0.21
Depth from: From location
Station coverage gap: 150°
Stations used: 153

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

After

The first 60 of at least 201.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000e1bp (also filed as ak19390912, ak0185xkb32x). Read Sun, Sep 27, 2026, 1:44 AM UTC.