Alaska earthquakes

M3.1 earthquake 258 km ESE of Chiniak, Alaska

A magnitude 3.1 earthquake struck 258 km ESE of Chiniak, Alaska on Sun, Mar 25, 2018, 2:39 AM AKDT (10:39 UTC), 23 km (14 mi) below the surface.

A larger quake followed: M5.5 276 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 25, 2018, 2:39 AM AKDT
UTC: 2018-03-25 10:39:42 UTC
Depth: 23.2 km (14.4 mi), shallow
Epicenter: 56.472° N, 148.571° 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 8.6 km horizontally, 10.7 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 202°, poorly surrounded by stations
Stations used: 32

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 us1000dcgm (also filed as ak18902326, ak0183v3bxvx). Read Thu, Sep 24, 2026, 3:41 PM UTC.