Alaska earthquakes

M3.4 earthquake 245 km SE of Chiniak, Alaska

A magnitude 3.4 earthquake struck 245 km SE of Chiniak, Alaska on Fri, Mar 23, 2018, 12:30 PM AKDT (20:30 UTC), 10 km (6 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: Fri, Mar 23, 2018, 12:30 PM AKDT
UTC: 2018-03-23 20:30:08 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 55.974° N, 149.591° 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, 2.0 km in depth
Magnitude uncertainty: ±0.06
Depth from: Operator assigned
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 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 us1000daqc (also filed as ak0183ry5l6f, ak18742664). Read Fri, Sep 25, 2026, 5:26 PM UTC.