Alaska earthquakes

M1.9 earthquake 44 km SE of Unalaska, Alaska

A magnitude 1.9 earthquake struck 44 km SE of Unalaska, Alaska on Fri, Oct 20, 2017, 8:50 PM AKDT (04:50 UTC), 51 km (32 mi) below the surface.

A larger quake followed: M4.6 109 km S of Unalaska, 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.

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The earthquake

Magnitude: 1.9 (ML, local (Richter)), micro
Magnitude from: Alaska Earthquake Center
Local time: Fri, Oct 20, 2017, 8:50 PM AKDT
UTC: 2017-10-21 04:50:26 UTC
Depth: 51.1 km (31.8 mi), shallow
Epicenter: 53.619° N, 166.010° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Stations used: 13

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast45 kmSE

Nearby

Within 100 km, magnitude 1.5 and up: 102 in the 60 days after this one and 43 in the 30 days before it.

After

The first 60 of 102.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak017diaojh4 (also filed as ak17097352). Read Sat, Oct 3, 2026, 12:12 PM UTC.