Alaska earthquakes

M3.7 earthquake 260 km SE of Chiniak, Alaska

A magnitude 3.7 earthquake struck 260 km SE of Chiniak, Alaska on Mon, Mar 12, 2018, 8:20 AM AKDT (16:20 UTC), 7 km (5 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: 3.7 (ml), minor
Local time: Mon, Mar 12, 2018, 8:20 AM AKDT
UTC: 2018-03-12 16:20:23 UTC
Depth: 7.3 km (4.6 mi), shallow
Epicenter: 55.983° N, 149.223° 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, 7.0 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 194°, poorly surrounded by stations
Stations used: 104

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 us1000d3e4 (also filed as ak18691757, ak01839osx5o). Read Sun, Sep 27, 2026, 2:42 PM UTC.