Alaska earthquakes

M4.3 earthquake 242 km SE of Chiniak, Alaska

A magnitude 4.3 earthquake struck 242 km SE of Chiniak, Alaska on Fri, May 11, 2018, 4:55 AM AKDT (12:55 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: 4.3 (mb), light
Local time: Fri, May 11, 2018, 4:55 AM AKDT
UTC: 2018-05-11 12:55:57 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.431° N, 148.934° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was I, not felt shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.4 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.09
Depth from: Operator assigned
Station coverage gap: 139°
Stations used: 337

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 us1000e2re (also filed as ak19440210, ak01860uvo5n). Read Tue, Sep 22, 2026, 11:08 AM UTC.