Alaska earthquakes

M3.5 earthquake 229 km SE of Chiniak, Alaska

A magnitude 3.5 earthquake struck 229 km SE of Chiniak, Alaska on Sat, Jan 27, 2018, 11:56 PM AKST (08:56 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M5.1 233 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: Sat, Jan 27, 2018, 11:56 PM AKST
UTC: 2018-01-28 08:56:12 UTC
Depth: 6.6 km (4.1 mi), shallow
Epicenter: 55.933° N, 150.106° 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 5.5 km horizontally, 6.9 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 198°, poorly surrounded by stations
Stations used: 73

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 at least 200 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 us2000cqm1 (also filed as ak18216869, ak0181ag580a). Read Mon, Sep 28, 2026, 4:17 PM UTC.