Alaska earthquakes

M4.1 earthquake 262 km ESE of Chiniak, Alaska

A magnitude 4.1 earthquake struck 262 km ESE of Chiniak, Alaska on Sun, Jan 28, 2018, 2:31 PM AKST (23:31 UTC), 17 km (11 mi) below the surface.

A larger quake followed: M5.4 252 km ESE of Chiniak, Alaska. This one was a foreshock.

Kodiak forecast More in Alaska

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude: 4.1 (mwr), light
Local time: Sun, Jan 28, 2018, 2:31 PM AKST
UTC: 2018-01-28 23:31:28 UTC
Depth: 17.2 km (10.7 mi), shallow
Epicenter: 56.440° N, 148.530° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

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: 4.1 Mwr
Nodal plane 1: Strike 86°, dip 84°, rake -34°
Nodal plane 2: Strike 179°, dip 56°, rake -173°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.0 km horizontally, 4.8 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 69°
Stations used: 375

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

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000cqs2 (also filed as ak0181aoxeha, ak18222591). Read Mon, Sep 28, 2026, 4:03 PM UTC.