M2.3 earthquake 130 km S of Unalaska, Alaska

A magnitude 2.3 earthquake struck 130 km S of Unalaska, Alaska on Wed, Sep 21, 2016, 4:06 AM AKDT (12:06 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M4.6 120 km E of Nikolski, Alaska. This one was a foreshock.

Map

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

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 72 in the 60 days after this one and 27 in the 30 days before it.

The first 60 of 72.

From the USGS Earthquake Hazards Program and its partner networks, event ak016c6glijb (also filed as ak14023327). Read Sun, Oct 4, 2026, 2:44 PM UTC.