Alaska earthquakes

M4.5 earthquake 231 km SE of Chiniak, Alaska

A magnitude 4.5 earthquake struck 231 km SE of Chiniak, Alaska on Sat, Mar 3, 2018, 3:20 PM AKST (00:20 UTC), 10 km (6 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: 4.5 (mb), light
Local time: Sat, Mar 3, 2018, 3:20 PM AKST
UTC: 2018-03-04 00:20:35 UTC
Depth: 10.1 km (6.3 mi), shallow
Epicenter: 56.234° N, 149.430° 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 6.5 km horizontally, 4.5 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 140°
Stations used: 227

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 us2000dbw6 (also filed as ak18580467, ak0182w6z8l0). Read Sun, Sep 27, 2026, 1:37 PM UTC.