Alaska earthquakes

M3.1 earthquake 238 km SE of Chiniak, Alaska

A magnitude 3.1 earthquake struck 238 km SE of Chiniak, Alaska on Sun, Mar 4, 2018, 3:08 PM AKST (00:08 UTC), 8 km (5 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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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Sun, Mar 4, 2018, 3:08 PM AKST
UTC: 2018-03-05 00:08:15 UTC
Depth: 7.8 km (4.9 mi), shallow
Epicenter: 55.995° N, 149.726° 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 7.7 km horizontally, 7.9 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 193°, poorly surrounded by stations
Stations used: 83

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 us1000d2x8 (also filed as ak18670390, ak0182xufywb). Read Sun, Sep 27, 2026, 12:42 PM UTC.