Alaska earthquakes

M3.5 earthquake 257 km ESE of Chiniak, Alaska

A magnitude 3.5 earthquake struck 257 km ESE of Chiniak, Alaska on Tue, Jan 23, 2018, 2:15 AM AKST (11:15 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M5.5 228 km SE 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: 3.5 (ml), minor
Local time: Tue, Jan 23, 2018, 2:15 AM AKST
UTC: 2018-01-23 11:15:15 UTC
Depth: 20.0 km (12.4 mi), shallow
Epicenter: 56.504° N, 148.559° 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, 11.9 km in depth
Depth from: From location
Station coverage gap: 266°, poorly surrounded by stations
Stations used: 11

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 200 in the 60 days after this one and 37 in the 30 days before it.

After

The first 60 of at least 200.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000ce34 (also filed as ak18282446, ak018128006r). Read Tue, Sep 29, 2026, 11:15 PM UTC.