Alaska earthquakes

M3.9 earthquake 26 km SSW of Unalaska, Alaska

A magnitude 3.9 earthquake struck 26 km SSW of Unalaska, Alaska on Mon, Jan 2, 2017, 11:05 PM AKST (08:05 UTC), 63 km (39 mi) below the surface.

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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: 3.9 (mb, body-wave), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Mon, Jan 2, 2017, 11:05 PM AKST
UTC: 2017-01-03 08:05:31 UTC
Depth: 63.0 km (39.1 mi), shallow
Epicenter: 53.646° N, 166.647° W
Region: Alaska
Felt reports: 1
Strongest shaking: III, weak shaking
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
3.9	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.107 · 23 stations
4.0	ML, local (Richter)	Alaska Earthquake Center	Preliminary

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: III, weak shaking
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

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

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.9 km horizontally, 13.7 km in depth
Magnitude uncertainty: ±0.11
Depth from: From location
Station coverage gap: 159°
Stations used: 79

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast26 kmSSW

Nearby

Within 100 km, magnitude 1.5 and up: 110 in the 60 days after this one and 48 in the 30 days before it.

After

The first 60 of 110.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us10007pfd (also filed as ak14906134, ak0171ey2fgs). Read Sat, Oct 3, 2026, 2:13 AM UTC.