M4.5 earthquake 73 km ESE of Adak, Alaska

A magnitude 4.5 earthquake struck 73 km ESE of Adak, Alaska on Thu, May 22, 1986, 2:48 AM HADT (11:48 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.9 89 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 1.5 and up: 67 in the 60 days after this one and 132 in the 30 days before it.

The first 60 of 67.

From the USGS Earthquake Hazards Program and its partner networks, event usp0002ua8. Read Tue, Sep 22, 2026, 9:31 PM UTC.