Alaska earthquakes

M4.2 earthquake 232 km SE of Chiniak, Alaska

A magnitude 4.2 earthquake struck 232 km SE of Chiniak, Alaska on Mon, Mar 12, 2018, 4:59 PM AKDT (00:59 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M5.2 228 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: Mon, Mar 12, 2018, 4:59 PM AKDT
UTC: 2018-03-13 00:59:27 UTC
Depth: 7.0 km (4.3 mi), shallow
Epicenter: 55.964° N, 149.950° 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 6.8 km horizontally, 5.3 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 141°
Stations used: 185

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

After

The first 60 of at least 202.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000d3m0 (also filed as ak18693182, ak0183b31p8b). Read Sun, Sep 27, 2026, 4:52 PM UTC.