Alaska earthquakes

M3.1 earthquake 26 km SE of Unalaska, Alaska

A magnitude 3.1 earthquake struck 26 km SE of Unalaska, Alaska on Sat, Mar 17, 2018, 11:31 AM AKDT (19:31 UTC), 16 km (10 mi) below the surface.

A larger quake followed: M4.5 96 km SSE of Akutan, 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: 3.1 (ml), minor
Local time: Sat, Mar 17, 2018, 11:31 AM AKDT
UTC: 2018-03-17 19:31:10 UTC
Depth: 15.8 km (9.8 mi), shallow
Epicenter: 53.711° N, 166.232° 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.

Location uncertainty: About 2.7 km horizontally, 10.4 km in depth
Depth from: From location
Station coverage gap: 191°, poorly surrounded by stations
Stations used: 30

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast27 kmSE

Nearby

Within 100 km, magnitude 1.5 and up: 113 in the 60 days after this one and 40 in the 30 days before it.

After

The first 60 of 113.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000d8gk (also filed as ak18704255, ak0183i0ca2d, av61686336). Read Thu, Oct 1, 2026, 1:33 AM UTC.