Alaska earthquakes

M3.4 earthquake 231 km SE of Chiniak, Alaska

A magnitude 3.4 earthquake struck 231 km SE of Chiniak, Alaska on Sun, Mar 11, 2018, 4:00 AM AKDT (12:00 UTC), 19 km (12 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: 3.4 (ml), minor
Local time: Sun, Mar 11, 2018, 4:00 AM AKDT
UTC: 2018-03-11 12:00:09 UTC
Depth: 19.3 km (12.0 mi), shallow
Epicenter: 56.392° N, 149.199° 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 9.7 km horizontally, 10.5 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 231°, poorly surrounded by stations
Stations used: 92

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 us1000d32e (also filed as ak01837yrihl, ak18676074). Read Sun, Sep 27, 2026, 12:39 PM UTC.