M4.9 earthquake 80 km SSE of Atka, Alaska

A magnitude 4.9 earthquake struck 80 km SSE of Atka, Alaska on Tue, Jun 17, 1986, 6:30 PM HADT (03:30 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.4 125 km SE 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 1.9 and up: 22 in the 60 days after this one and 27 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event usp0002v5e. Read Mon, Sep 28, 2026, 11:58 PM UTC.