Alaska earthquakes

M4.1 earthquake 108 km SW of Nikolski, Alaska

A magnitude 4.1 earthquake struck 108 km SW of Nikolski, Alaska on Wed, Nov 29, 2017, 5:45 PM HAST (03:45 UTC), 45 km (28 mi) below the surface.

A larger quake followed: M4.3 157 km SW of Nikolski, Alaska. This one was a foreshock.

Unalaska 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 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, Nov 29, 2017, 5:45 PM HAST
UTC: 2017-11-30 03:45:46 UTC
Depth: 44.9 km (27.9 mi), shallow
Epicenter: 52.297° N, 170.063° 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
4.1	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.078 · 45 stations
3.5	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 5.9 km horizontally, 6.5 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 176°
Stations used: 69

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast294 kmSW

Nearby

Within 100 km, magnitude 1.5 and up: 39 in the 60 days after this one and 25 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000bml1 (also filed as ak17405033, ak017fcfjyhp). Read Thu, Oct 1, 2026, 1:50 PM UTC.