Alaska earthquakes

M3.3 earthquake 202 km SE of Chiniak, Alaska

A magnitude 3.3 earthquake struck 202 km SE of Chiniak, Alaska on Tue, Jan 23, 2018, 11:12 AM AKST (20:12 UTC), 34 km (21 mi) below the surface.

A larger quake followed: M5.5 256 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: 3.3 (ml), minor
Local time: Tue, Jan 23, 2018, 11:12 AM AKST
UTC: 2018-01-23 20:12:44 UTC
Depth: 33.5 km (20.8 mi), shallow
Epicenter: 56.257° N, 150.069° 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 8.4 km horizontally, 14.1 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 199°, poorly surrounded by stations
Stations used: 99

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 182 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 us2000cr23 (also filed as ak18188719, ak01812dcbj3). Read Tue, Sep 29, 2026, 12:15 AM UTC.