Alaska earthquakes

M3.9 earthquake 214 km SE of Chiniak, Alaska

A magnitude 3.9 earthquake struck 214 km SE of Chiniak, Alaska on Tue, Jan 23, 2018, 4:24 AM AKST (13:24 UTC), 10 km (6 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: 3.9 (mb, body-wave), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Jan 23, 2018, 4:24 AM AKST
UTC: 2018-01-23 13:24:54 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.238° N, 149.811° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
3.9	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.364 · 2 stations
3.2	ML, local (Richter)	Alaska Earthquake Center	Preliminary

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 8.3 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.36
Depth from: Operator assigned
Station coverage gap: 238°, poorly surrounded by stations
Stations used: 30

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 91 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 us1000ce3q (also filed as ak18282469, ak0181298vrn). Read Sat, Oct 3, 2026, 6:03 AM UTC.