M4.5 earthquake 95 km SW of Unalaska, Alaska

A magnitude 4.5 earthquake struck 95 km SW of Unalaska, Alaska on Fri, Feb 27, 1987, 12:02 AM AKST (09:02 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.7 38 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: 42 in the 60 days after this one and 3 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event usp00032u9. Read Wed, Sep 30, 2026, 8:09 AM UTC.