Alaska earthquakes

M3.4 earthquake 226 km SE of Chiniak, Alaska

A magnitude 3.4 earthquake struck 226 km SE of Chiniak, Alaska on Wed, Feb 28, 2018, 7:37 AM AKST (16:37 UTC), 23 km (14 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: 3.4 (ml), minor
Local time: Wed, Feb 28, 2018, 7:37 AM AKST
UTC: 2018-02-28 16:37:02 UTC
Depth: 22.6 km (14.0 mi), shallow
Epicenter: 56.046° N, 149.903° 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 8.5 km horizontally, 10.8 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 209°, poorly surrounded by stations
Stations used: 49

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 us1000d153 (also filed as ak0182pugcoy, ak18616440). Read Sun, Sep 27, 2026, 4:19 PM UTC.