Alaska earthquakes

M4.5 earthquake 202 km SE of Chiniak, Alaska

A magnitude 4.5 earthquake struck 202 km SE of Chiniak, Alaska on Tue, Jan 23, 2018, 6:43 AM AKST (15:43 UTC), 10 km (6 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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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: Tue, Jan 23, 2018, 6:43 AM AKST
UTC: 2018-01-23 15:43:10 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.152° N, 150.289° 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 6.3 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 153°
Stations used: 80

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 110 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 us2000cn4e (also filed as ak18181760, ak01812ajq07). Read Tue, Sep 29, 2026, 3:47 AM UTC.