M1.5 earthquake 141 km S of Unalaska, Alaska

A magnitude 1.5 earthquake struck 141 km S of Unalaska, Alaska on Wed, Aug 11, 2021, 3:54 AM AKDT (11:54 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M3.5 147 km ESE 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: 48 in the 60 days after this one and 33 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ak021a8zpuf4. Read Wed, Sep 23, 2026, 9:05 PM UTC.