M4.7 earthquake 74 km SSW of Atka, Alaska

A magnitude 4.7 earthquake struck 74 km SSW of Atka, Alaska on Sun, May 18, 1986, 10:14 AM HADT (19:14 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.4 51 km W of Atka, 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 1.7 and up: 66 in the 60 days after this one and 172 in the 30 days before it.

The first 60 of 66.

From the USGS Earthquake Hazards Program and its partner networks, event usp0002u5c. Read Fri, Oct 2, 2026, 5:35 PM UTC.