Alaska earthquakes

M4.6 earthquake 227 km SE of Chiniak, Alaska

A magnitude 4.6 earthquake struck 227 km SE of Chiniak, Alaska on Sat, Jan 27, 2018, 2:25 AM AKST (11:25 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M5.4 252 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: 4.6 (mwr), light
Local time: Sat, Jan 27, 2018, 2:25 AM AKST
UTC: 2018-01-27 11:25:54 UTC
Depth: 6.4 km (4.0 mi), shallow
Epicenter: 56.072° N, 149.827° 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.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Oblique normal
Moment magnitude: 4.6 Mwr
Nodal plane 1: Strike 18°, dip 41°, rake -135°
Nodal plane 2: Strike 252°, dip 62°, rake -58°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 6.0 km horizontally, 4.9 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 142°
Stations used: 308

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.6 and up: at least 202 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 202.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000cqbw (also filed as ak01818u7mde, ak18207708). Read Mon, Sep 28, 2026, 4:11 PM UTC.