M5.2 earthquake 76 km SSE of Adak, Alaska

A magnitude 5.2 earthquake struck 76 km SSE of Adak, Alaska on Fri, May 9, 1986, 11:42 AM HADT (20:42 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.3 87 km SSE of Adak, 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.

Within 100 km, magnitude 2.2 and up: 103 in the 60 days after this one and 80 in the 30 days before it.

The first 60 of 103.

From the USGS Earthquake Hazards Program and its partner networks, event usp0002tu4. Read Wed, Sep 23, 2026, 12:52 AM UTC.