M1.7 earthquake 20 km SSE of Unalaska, Alaska

A magnitude 1.7 earthquake struck 20 km SSE of Unalaska, Alaska on Tue, Jul 27, 2021, 4:50 PM AKDT (00:50 UTC), 73 km (45 mi) below the surface.

A larger quake followed: M1.8 70 km SSE of Akutan, 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: 80 in the 60 days after this one and 51 in the 30 days before it.

The first 60 of 80.

From the USGS Earthquake Hazards Program and its partner networks, event ak0219lnmdad. Read Wed, Sep 23, 2026, 2:48 PM UTC.