Alaska earthquakes

M4.1 earthquake 67 km SW of Unalaska, Alaska

A magnitude 4.1 earthquake struck 67 km SW of Unalaska, Alaska on Mon, Oct 9, 2017, 2:52 PM AKDT (22:52 UTC), 96 km (60 mi) below the surface.

A larger quake followed: M4.7 83 km ENE 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: Mon, Oct 9, 2017, 2:52 PM AKDT
UTC: 2017-10-09 22:52:06 UTC
Depth: 95.9 km (59.6 mi), intermediate-depth
Epicenter: 53.398° N, 167.165° 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 · ±0.097 · 29 stations
4.1	mb, body-wave	Alaska Earthquake Center	Preliminary

What happened

The USGS’s account of the effects of this earthquake.

Felt lightly at Unalaska.

From the USGS event page for us2000b39z. U.S. Geological Survey text and figures are in the public domain.

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, 4.7 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 179°
Stations used: 123

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast67 kmSW

Nearby

Within 100 km, magnitude 1.5 and up: 90 in the 60 days after this one and 39 in the 30 days before it.

After

The first 60 of 90.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000b39z (also filed as ak017cyqykew, ak17001047). Read Fri, Oct 2, 2026, 12:40 AM UTC.