Alaska earthquakes

M3.4 earthquake 20 km N of Nikolski, Alaska

A magnitude 3.4 earthquake struck 20 km N of Nikolski, Alaska on Wed, Aug 16, 2017, 7:36 PM AKDT (03:36 UTC), 114 km (71 mi) below the surface.

A larger quake followed: M4.6 77 km SW 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: 3.4 (ML, local (Richter)), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, Aug 16, 2017, 7:36 PM AKDT
UTC: 2017-08-17 03:36:18 UTC
Depth: 113.7 km (70.6 mi), intermediate-depth
Epicenter: 53.125° N, 168.897° 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
3.4	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.148 · 6 stations
2.7	ML, local (Richter)	Alaska Earthquake Center	Preliminary

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 14.4 km horizontally, 8.0 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 149°
Stations used: 19

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast177 kmWSW

Nearby

Within 100 km, magnitude 1.5 and up: 56 in the 60 days after this one and 58 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 us2000adc5 (also filed as ak017ais2j4e, ak16543780). Read Fri, Oct 2, 2026, 11:23 AM UTC.