Alaska earthquakes

M5.2 earthquake 69 km WNW of Nikolski, Alaska

A magnitude 5.2 earthquake struck 69 km WNW of Nikolski, Alaska on Mon, Jan 9, 2017, 10:20 AM AKST (19:20 UTC), 81 km (50 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: 5.2 (Mww, W-phase moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Mon, Jan 9, 2017, 10:20 AM AKST
UTC: 2017-01-09 19:20:03 UTC
Depth: 80.6 km (50.1 mi), intermediate-depth
Epicenter: 53.086° N, 169.867° W
Region: Alaska
Strongest shaking: IV, light shaking
Tsunami flag: Yes: a large quake in an oceanic region
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
5.2	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.069 · 20 stations
5.27	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.2	Mw, moment	Alaska Earthquake Center	Preliminary
5.1	ML, local (Richter)	NOAA National Tsunami Warning Center	Reviewed · 9 stations
5.2	Mwb, body-wave moment	USGS National Earthquake Information Center	Moment tensor · Reviewed

What happened

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

Felt at Nikolski.

From the USGS event page for us10007s5a. U.S. Geological Survey text and figures are in the public domain.

Tsunami

The USGS flags a quake this large in an oceanic region. The flag does not mean a tsunami happened; the tsunami warning centers decide that, and their messages are below when they issued any.

Current tsunami warnings: tsunami.gov. Warnings in force in the US also appear on our alerts pages.

Shaking

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

Strongest estimated: IV, light shaking
Map: Automatic

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

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: Reverse (thrust)
Moment magnitude: 5.2 Mww
Nodal plane 1: Strike 80°, dip 25°, rake 105°
Nodal plane 2: Strike 244°, dip 65°, rake 83°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 7.1 km horizontally, 4.0 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 48°
Stations used: 728

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast237 kmWSW

Nearby

Within 100 km, magnitude 2.2 and up: 32 in the 60 days after this one and 19 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 us10007s5a (also filed as at00ojj1pg, ak15059272, ak017f79nmq, iscgem611831509). Read Sat, Oct 3, 2026, 3:18 PM UTC.