Alaska earthquakes

M4.2 earthquake 72 km SSW of Unalaska, Alaska

A magnitude 4.2 earthquake struck 72 km SSW of Unalaska, Alaska on Tue, Jun 27, 2017, 3:45 PM AKDT (23:45 UTC), 46 km (29 mi) below the surface.

Unalaska forecast More in Alaska

Map

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

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The earthquake

Magnitude: 4.2 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Jun 27, 2017, 3:45 PM AKDT
UTC: 2017-06-27 23:45:28 UTC
Depth: 46.5 km (28.9 mi), shallow
Epicenter: 53.242° N, 166.790° W
Region: Alaska
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
4.2	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.086 · 37 stations
4.2	mb, body-wave	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?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.5 km horizontally, 7.9 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 163°
Stations used: 141

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast72 kmSSW

Nearby

Within 100 km, magnitude 1.5 and up: 121 in the 60 days after this one and 40 in the 30 days before it.

After

The first 60 of 121.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us20009pzk (also filed as ak16239908, ak01786rmg2s). Read Fri, Oct 2, 2026, 11:16 AM UTC.