Alaska earthquakes

M4.5 earthquake 269 km SE of Chiniak, Alaska

A magnitude 4.5 earthquake struck 269 km SE of Chiniak, Alaska on Thu, Mar 22, 2018, 9:38 AM AKDT (17:38 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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The earthquake

Magnitude: 4.5 (mb), light
Local time: Thu, Mar 22, 2018, 9:38 AM AKDT
UTC: 2018-03-22 17:38:10 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.254° N, 148.625° 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 4.0 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 142°
Stations used: 85

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 us1000d7kc (also filed as ak0183q8vnpg, ak18728341). Read Sun, Sep 27, 2026, 6:06 PM UTC.