Alaska earthquakes

M3.8 earthquake 210 km SE of Chiniak, Alaska

A magnitude 3.8 earthquake struck 210 km SE of Chiniak, Alaska on Tue, Jan 23, 2018, 12:36 PM AKST (21:36 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.3 254 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: 3.8 (mb), minor
Local time: Tue, Jan 23, 2018, 12:36 PM AKST
UTC: 2018-01-23 21:36:22 UTC
Depth: 33.2 km (20.6 mi), shallow
Epicenter: 56.094° N, 150.219° 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 9.2 km horizontally, 10.9 km in depth
Magnitude uncertainty: ±0.36
Depth from: From location
Station coverage gap: 230°, poorly surrounded by stations
Stations used: 60

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 173 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 us2000cr2d (also filed as ak18190248, ak01812e2ur6). Read Tue, Sep 29, 2026, 4:43 AM UTC.