Alaska earthquakes

M4.2 earthquake 247 km SE of Chiniak, Alaska

A magnitude 4.2 earthquake struck 247 km SE of Chiniak, Alaska on Sun, Mar 4, 2018, 3:31 AM AKST (12:31 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M5.4 252 km ESE 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: Sun, Mar 4, 2018, 3:31 AM AKST
UTC: 2018-03-04 12:31:27 UTC
Depth: 20.1 km (12.5 mi), shallow
Epicenter: 56.143° N, 149.244° 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, 7.7 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 144°
Stations used: 272

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 us2000dc1e (also filed as ak0182we6s0f, ak18582576). Read Sun, Sep 27, 2026, 4:46 PM UTC.