M4.2 earthquake 94 km ESE of Adak, Alaska

A magnitude 4.2 earthquake struck 94 km ESE of Adak, Alaska on Wed, May 7, 1986, 3:35 PM HADT (00:35 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M6.5 57 km S 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: at least 200 in the 60 days after this one and 36 in the 30 days before it.

The first 60 of at least 200.

From the USGS Earthquake Hazards Program and its partner networks, event usp0002tns. Read Wed, Sep 30, 2026, 10:41 PM UTC.