Alaska earthquakes

M4.0 earthquake 14 km WNW of Dutch Harbor, Alaska

A magnitude 4.0 earthquake struck 14 km WNW of Dutch Harbor, Alaska on Sun, Aug 28, 2016, 9:59 PM AKDT (05:59 UTC), 125 km (78 mi) below the surface.

A larger quake followed: M4.8 63 km SSE of Akutan, Alaska. This one was a foreshock.

Dutch Harbor 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: 4.0 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Sun, Aug 28, 2016, 9:59 PM AKDT
UTC: 2016-08-29 05:59:16 UTC
Depth: 125.4 km (77.9 mi), intermediate-depth
Epicenter: 53.934° N, 166.748° W
Region: Alaska
Felt reports: 1
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
4.0	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.096 · 29 stations
4.0	ML, local (Richter)	Alaska Earthquake Center	Preliminary

What happened

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

Felt at Unalaska.

From the USGS event page for us20006uzd. U.S. Geological Survey text and figures are in the public domain.

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 4.4 km horizontally, 4.1 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 52°
Stations used: 150

Nearest places

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

Dutch Harbor, AlaskaPopulation 4,376. Forecast14 kmWNW

Nearby

Within 100 km, magnitude 1.5 and up: 89 in the 60 days after this one and 31 in the 30 days before it.

After

The first 60 of 89.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us20006uzd (also filed as ak13885297, ak016b4bdu57). Read Sat, Oct 3, 2026, 8:46 PM UTC.